Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
new file mode 100644
index 0000000..dc796c1
--- /dev/null
+++ b/arch/um/kernel/Makefile
@@ -0,0 +1,58 @@
+#
+# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+extra-y := vmlinux.lds
+clean-files := vmlinux.lds.S config.tmp
+
+obj-y = checksum.o config.o exec_kern.o exitcode.o \
+ helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o mem_user.o \
+ physmem.o process.o process_kern.o ptrace.o reboot.o resource.o \
+ sigio_user.o sigio_kern.o signal_kern.o signal_user.o smp.o \
+ syscall_kern.o sysrq.o sys_call_table.o tempfile.o time.o time_kern.o \
+ tlb.o trap_kern.o trap_user.o uaccess_user.o um_arch.o umid.o \
+ user_util.o
+
+obj-$(CONFIG_BLK_DEV_INITRD) += initrd_kern.o initrd_user.o
+obj-$(CONFIG_GPROF) += gprof_syms.o
+obj-$(CONFIG_GCOV) += gmon_syms.o
+obj-$(CONFIG_TTY_LOG) += tty_log.o
+obj-$(CONFIG_SYSCALL_DEBUG) += syscall_user.o
+
+obj-$(CONFIG_MODE_TT) += tt/
+obj-$(CONFIG_MODE_SKAS) += skas/
+
+# This needs be compiled with frame pointers regardless of how the rest of the
+# kernel is built.
+CFLAGS_frame.o := -fno-omit-frame-pointer
+
+user-objs-$(CONFIG_TTY_LOG) += tty_log.o
+
+USER_OBJS := $(user-objs-y) config.o helper.o main.o process.o tempfile.o \
+ time.o tty_log.o umid.o user_util.o frame.o
+
+include arch/um/scripts/Makefile.rules
+
+targets += config.c
+
+# Be careful with the below Sed code - sed is pitfall-rich!
+# We use sed to lower build requirements, for "embedded" builders for instance.
+
+$(obj)/config.tmp: $(objtree)/.config FORCE
+ $(call if_changed,quote1)
+
+quiet_cmd_quote1 = QUOTE $@
+ cmd_quote1 = sed -e 's/"/\\"/g' -e 's/^/"/' -e 's/$$/\\n"/' \
+ $< > $@
+
+$(obj)/config.c: $(src)/config.c.in $(obj)/config.tmp FORCE
+ $(call if_changed,quote2)
+
+quiet_cmd_quote2 = QUOTE $@
+ cmd_quote2 = sed -e '/CONFIG/{' \
+ -e 's/"CONFIG"\;/""/' \
+ -e 'r $(obj)/config.tmp' \
+ -e 'a""\;' \
+ -e '}' \
+ $< > $@
diff --git a/arch/um/kernel/checksum.c b/arch/um/kernel/checksum.c
new file mode 100644
index 0000000..e69b2be
--- /dev/null
+++ b/arch/um/kernel/checksum.c
@@ -0,0 +1,36 @@
+#include "asm/uaccess.h"
+#include "linux/errno.h"
+#include "linux/module.h"
+
+unsigned int arch_csum_partial(const unsigned char *buff, int len, int sum);
+
+unsigned int csum_partial(unsigned char *buff, int len, int sum)
+{
+ return arch_csum_partial(buff, len, sum);
+}
+
+EXPORT_SYMBOL(csum_partial);
+
+unsigned int csum_partial_copy_to(const unsigned char *src,
+ unsigned char __user *dst, int len, int sum,
+ int *err_ptr)
+{
+ if(copy_to_user(dst, src, len)){
+ *err_ptr = -EFAULT;
+ return(-1);
+ }
+
+ return(arch_csum_partial(src, len, sum));
+}
+
+unsigned int csum_partial_copy_from(const unsigned char __user *src,
+ unsigned char *dst, int len, int sum,
+ int *err_ptr)
+{
+ if(copy_from_user(dst, src, len)){
+ *err_ptr = -EFAULT;
+ return(-1);
+ }
+
+ return arch_csum_partial(dst, len, sum);
+}
diff --git a/arch/um/kernel/config.c.in b/arch/um/kernel/config.c.in
new file mode 100644
index 0000000..c062cbf
--- /dev/null
+++ b/arch/um/kernel/config.c.in
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "init.h"
+
+static __initdata char *config = "CONFIG";
+
+static int __init print_config(char *line, int *add)
+{
+ printf("%s", config);
+ exit(0);
+}
+
+__uml_setup("--showconfig", print_config,
+"--showconfig\n"
+" Prints the config file that this UML binary was generated from.\n\n"
+);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/dyn.lds.S b/arch/um/kernel/dyn.lds.S
new file mode 100644
index 0000000..715b083
--- /dev/null
+++ b/arch/um/kernel/dyn.lds.S
@@ -0,0 +1,176 @@
+#include <asm-generic/vmlinux.lds.h>
+
+OUTPUT_FORMAT(ELF_FORMAT)
+OUTPUT_ARCH(ELF_ARCH)
+ENTRY(_start)
+jiffies = jiffies_64;
+
+SECTIONS
+{
+ PROVIDE (__executable_start = START);
+ . = START + SIZEOF_HEADERS;
+ .interp : { *(.interp) }
+ /* Used in arch/um/kernel/mem.c. Any memory between START and __binary_start
+ * is remapped.*/
+ __binary_start = .;
+ . = ALIGN(4096); /* Init code and data */
+ _stext = .;
+ __init_begin = .;
+ .init.text : {
+ _sinittext = .;
+ *(.init.text)
+ _einittext = .;
+ }
+
+ . = ALIGN(4096);
+
+ /* Read-only sections, merged into text segment: */
+ .hash : { *(.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
+ .gnu.version_d : { *(.gnu.version_d) }
+ .gnu.version_r : { *(.gnu.version_r) }
+ .rel.init : { *(.rel.init) }
+ .rela.init : { *(.rela.init) }
+ .rel.text : { *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) }
+ .rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
+ .rel.fini : { *(.rel.fini) }
+ .rela.fini : { *(.rela.fini) }
+ .rel.rodata : { *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) }
+ .rela.rodata : { *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*) }
+ .rel.data : { *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*) }
+ .rela.data : { *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*) }
+ .rel.tdata : { *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*) }
+ .rela.tdata : { *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*) }
+ .rel.tbss : { *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*) }
+ .rela.tbss : { *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*) }
+ .rel.ctors : { *(.rel.ctors) }
+ .rela.ctors : { *(.rela.ctors) }
+ .rel.dtors : { *(.rel.dtors) }
+ .rela.dtors : { *(.rela.dtors) }
+ .rel.got : { *(.rel.got) }
+ .rela.got : { *(.rela.got) }
+ .rel.bss : { *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*) }
+ .rela.bss : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
+ .rel.plt : { *(.rel.plt) }
+ .rela.plt : { *(.rela.plt) }
+ .init : {
+ KEEP (*(.init))
+ } =0x90909090
+ .plt : { *(.plt) }
+ .text : {
+ *(.text)
+ SCHED_TEXT
+ LOCK_TEXT
+ *(.fixup)
+ *(.stub .text.* .gnu.linkonce.t.*)
+ /* .gnu.warning sections are handled specially by elf32.em. */
+ *(.gnu.warning)
+ } =0x90909090
+ .fini : {
+ KEEP (*(.fini))
+ } =0x90909090
+
+ .kstrtab : { *(.kstrtab) }
+
+ #include "asm/common.lds.S"
+
+ init.data : { *(.init.data) }
+
+ /* Ensure the __preinit_array_start label is properly aligned. We
+ could instead move the label definition inside the section, but
+ the linker would then create the section even if it turns out to
+ be empty, which isn't pretty. */
+ . = ALIGN(32 / 8);
+ .preinit_array : { *(.preinit_array) }
+ .init_array : { *(.init_array) }
+ .fini_array : { *(.fini_array) }
+ .data : {
+ . = ALIGN(KERNEL_STACK_SIZE); /* init_task */
+ *(.data.init_task)
+ *(.data .data.* .gnu.linkonce.d.*)
+ SORT(CONSTRUCTORS)
+ }
+ .data1 : { *(.data1) }
+ .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
+ .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
+ .eh_frame : { KEEP (*(.eh_frame)) }
+ .gcc_except_table : { *(.gcc_except_table) }
+ .dynamic : { *(.dynamic) }
+ .ctors : {
+ /* gcc uses crtbegin.o to find the start of
+ the constructors, so we make sure it is
+ first. Because this is a wildcard, it
+ doesn't matter if the user does not
+ actually link against crtbegin.o; the
+ linker won't look for a file to match a
+ wildcard. The wildcard also means that it
+ doesn't matter which directory crtbegin.o
+ is in. */
+ KEEP (*crtbegin.o(.ctors))
+ /* We don't want to include the .ctor section from
+ from the crtend.o file until after the sorted ctors.
+ The .ctor section from the crtend file contains the
+ end of ctors marker and it must be last */
+ KEEP (*(EXCLUDE_FILE (*crtend.o ) .ctors))
+ KEEP (*(SORT(.ctors.*)))
+ KEEP (*(.ctors))
+ }
+ .dtors : {
+ KEEP (*crtbegin.o(.dtors))
+ KEEP (*(EXCLUDE_FILE (*crtend.o ) .dtors))
+ KEEP (*(SORT(.dtors.*)))
+ KEEP (*(.dtors))
+ }
+ .jcr : { KEEP (*(.jcr)) }
+ .got : { *(.got.plt) *(.got) }
+ _edata = .;
+ PROVIDE (edata = .);
+ __bss_start = .;
+ .bss : {
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
+ *(COMMON)
+ /* Align here to ensure that the .bss section occupies space up to
+ _end. Align after .bss to ensure correct alignment even if the
+ .bss section disappears because there are no input sections. */
+ . = ALIGN(32 / 8);
+ . = ALIGN(32 / 8);
+ }
+ _end = .;
+ PROVIDE (end = .);
+ /* Stabs debugging sections. */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+ /* DWARF debug sections.
+ Symbols in the DWARF debugging sections are relative to the beginning
+ of the section so we begin them at 0. */
+ /* DWARF 1 */
+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+ /* GNU DWARF 1 extensions */
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+ /* DWARF 1.1 and DWARF 2 */
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ /* DWARF 2 */
+ .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+ /* SGI/MIPS DWARF 2 extensions */
+ .debug_weaknames 0 : { *(.debug_weaknames) }
+ .debug_funcnames 0 : { *(.debug_funcnames) }
+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+}
diff --git a/arch/um/kernel/exec_kern.c b/arch/um/kernel/exec_kern.c
new file mode 100644
index 0000000..49ddabe
--- /dev/null
+++ b/arch/um/kernel/exec_kern.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/slab.h"
+#include "linux/smp_lock.h"
+#include "linux/ptrace.h"
+#include "asm/ptrace.h"
+#include "asm/pgtable.h"
+#include "asm/tlbflush.h"
+#include "asm/uaccess.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "mem_user.h"
+#include "kern.h"
+#include "irq_user.h"
+#include "tlb.h"
+#include "2_5compat.h"
+#include "os.h"
+#include "time_user.h"
+#include "choose-mode.h"
+#include "mode_kern.h"
+
+void flush_thread(void)
+{
+ CHOOSE_MODE(flush_thread_tt(), flush_thread_skas());
+}
+
+void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
+{
+ CHOOSE_MODE_PROC(start_thread_tt, start_thread_skas, regs, eip, esp);
+}
+
+extern void log_exec(char **argv, void *tty);
+
+static long execve1(char *file, char __user * __user *argv,
+ char *__user __user *env)
+{
+ long error;
+
+#ifdef CONFIG_TTY_LOG
+ log_exec(argv, current->tty);
+#endif
+ error = do_execve(file, argv, env, ¤t->thread.regs);
+ if (error == 0){
+ task_lock(current);
+ current->ptrace &= ~PT_DTRACE;
+ task_unlock(current);
+ set_cmdline(current_cmd());
+ }
+ return(error);
+}
+
+long um_execve(char *file, char __user *__user *argv, char __user *__user *env)
+{
+ long err;
+
+ err = execve1(file, argv, env);
+ if(!err)
+ do_longjmp(current->thread.exec_buf, 1);
+ return(err);
+}
+
+long sys_execve(char *file, char __user *__user *argv,
+ char __user *__user *env)
+{
+ long error;
+ char *filename;
+
+ lock_kernel();
+ filename = getname((char __user *) file);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename)) goto out;
+ error = execve1(filename, argv, env);
+ putname(filename);
+ out:
+ unlock_kernel();
+ return(error);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/exitcode.c b/arch/um/kernel/exitcode.c
new file mode 100644
index 0000000..0ea87f2
--- /dev/null
+++ b/arch/um/kernel/exitcode.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/init.h"
+#include "linux/ctype.h"
+#include "linux/proc_fs.h"
+#include "asm/uaccess.h"
+
+/* If read and write race, the read will still atomically read a valid
+ * value.
+ */
+int uml_exitcode = 0;
+
+static int read_proc_exitcode(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int len;
+
+ len = sprintf(page, "%d\n", uml_exitcode);
+ len -= off;
+ if(len <= off+count) *eof = 1;
+ *start = page + off;
+ if(len > count) len = count;
+ if(len < 0) len = 0;
+ return(len);
+}
+
+static int write_proc_exitcode(struct file *file, const char __user *buffer,
+ unsigned long count, void *data)
+{
+ char *end, buf[sizeof("nnnnn\0")];
+ int tmp;
+
+ if(copy_from_user(buf, buffer, count))
+ return(-EFAULT);
+ tmp = simple_strtol(buf, &end, 0);
+ if((*end != '\0') && !isspace(*end))
+ return(-EINVAL);
+ uml_exitcode = tmp;
+ return(count);
+}
+
+static int make_proc_exitcode(void)
+{
+ struct proc_dir_entry *ent;
+
+ ent = create_proc_entry("exitcode", 0600, &proc_root);
+ if(ent == NULL){
+ printk("make_proc_exitcode : Failed to register "
+ "/proc/exitcode\n");
+ return(0);
+ }
+
+ ent->read_proc = read_proc_exitcode;
+ ent->write_proc = write_proc_exitcode;
+
+ return(0);
+}
+
+__initcall(make_proc_exitcode);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/gmon_syms.c b/arch/um/kernel/gmon_syms.c
new file mode 100644
index 0000000..2c86e7f
--- /dev/null
+++ b/arch/um/kernel/gmon_syms.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/module.h"
+
+extern void __bb_init_func(void *);
+EXPORT_SYMBOL(__bb_init_func);
+
+/* This is defined (and referred to in profiling stub code) only by some GCC
+ * versions in libgcov.
+ *
+ * Since SuSE backported the fix, we cannot handle it depending on GCC version.
+ * So, unconditinally export it. But also give it a weak declaration, which will
+ * be overriden by any other one.
+ */
+
+extern void __gcov_init(void *) __attribute__((weak));
+EXPORT_SYMBOL(__gcov_init);
+
+extern void __gcov_merge_add(void *) __attribute__((weak));
+EXPORT_SYMBOL(__gcov_merge_add);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/gprof_syms.c b/arch/um/kernel/gprof_syms.c
new file mode 100644
index 0000000..9244f01
--- /dev/null
+++ b/arch/um/kernel/gprof_syms.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/module.h"
+
+extern void mcount(void);
+EXPORT_SYMBOL(mcount);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/helper.c b/arch/um/kernel/helper.c
new file mode 100644
index 0000000..13b1f5c
--- /dev/null
+++ b/arch/um/kernel/helper.c
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <sys/signal.h>
+#include <sys/wait.h>
+#include "user.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "os.h"
+
+struct helper_data {
+ void (*pre_exec)(void*);
+ void *pre_data;
+ char **argv;
+ int fd;
+};
+
+/* Debugging aid, changed only from gdb */
+int helper_pause = 0;
+
+static void helper_hup(int sig)
+{
+}
+
+static int helper_child(void *arg)
+{
+ struct helper_data *data = arg;
+ char **argv = data->argv;
+ int errval;
+
+ if(helper_pause){
+ signal(SIGHUP, helper_hup);
+ pause();
+ }
+ if(data->pre_exec != NULL)
+ (*data->pre_exec)(data->pre_data);
+ execvp(argv[0], argv);
+ errval = errno;
+ printk("execvp of '%s' failed - errno = %d\n", argv[0], errno);
+ os_write_file(data->fd, &errval, sizeof(errval));
+ os_kill_process(os_getpid(), 0);
+ return(0);
+}
+
+/* Returns either the pid of the child process we run or -E* on failure.
+ * XXX The alloc_stack here breaks if this is called in the tracing thread */
+int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
+ unsigned long *stack_out)
+{
+ struct helper_data data;
+ unsigned long stack, sp;
+ int pid, fds[2], ret, n;
+
+ if((stack_out != NULL) && (*stack_out != 0))
+ stack = *stack_out;
+ else stack = alloc_stack(0, um_in_interrupt());
+ if(stack == 0)
+ return(-ENOMEM);
+
+ ret = os_pipe(fds, 1, 0);
+ if(ret < 0){
+ printk("run_helper : pipe failed, ret = %d\n", -ret);
+ goto out_free;
+ }
+
+ ret = os_set_exec_close(fds[1], 1);
+ if(ret < 0){
+ printk("run_helper : setting FD_CLOEXEC failed, ret = %d\n",
+ -ret);
+ goto out_close;
+ }
+
+ sp = stack + page_size() - sizeof(void *);
+ data.pre_exec = pre_exec;
+ data.pre_data = pre_data;
+ data.argv = argv;
+ data.fd = fds[1];
+ pid = clone(helper_child, (void *) sp, CLONE_VM | SIGCHLD, &data);
+ if(pid < 0){
+ printk("run_helper : clone failed, errno = %d\n", errno);
+ ret = -errno;
+ goto out_close;
+ }
+
+ os_close_file(fds[1]);
+ fds[1] = -1;
+
+ /*Read the errno value from the child.*/
+ n = os_read_file(fds[0], &ret, sizeof(ret));
+ if(n < 0){
+ printk("run_helper : read on pipe failed, ret = %d\n", -n);
+ ret = n;
+ os_kill_process(pid, 1);
+ }
+ else if(n != 0){
+ CATCH_EINTR(n = waitpid(pid, NULL, 0));
+ ret = -errno;
+ } else {
+ ret = pid;
+ }
+
+out_close:
+ if (fds[1] != -1)
+ os_close_file(fds[1]);
+ os_close_file(fds[0]);
+out_free:
+ if(stack_out == NULL)
+ free_stack(stack, 0);
+ else *stack_out = stack;
+ return(ret);
+}
+
+int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
+ unsigned long *stack_out, int stack_order)
+{
+ unsigned long stack, sp;
+ int pid, status;
+
+ stack = alloc_stack(stack_order, um_in_interrupt());
+ if(stack == 0) return(-ENOMEM);
+
+ sp = stack + (page_size() << stack_order) - sizeof(void *);
+ pid = clone(proc, (void *) sp, flags | SIGCHLD, arg);
+ if(pid < 0){
+ printk("run_helper_thread : clone failed, errno = %d\n",
+ errno);
+ return(-errno);
+ }
+ if(stack_out == NULL){
+ CATCH_EINTR(pid = waitpid(pid, &status, 0));
+ if(pid < 0){
+ printk("run_helper_thread - wait failed, errno = %d\n",
+ errno);
+ pid = -errno;
+ }
+ if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
+ printk("run_helper_thread - thread returned status "
+ "0x%x\n", status);
+ free_stack(stack, stack_order);
+ }
+ else *stack_out = stack;
+ return(pid);
+}
+
+int helper_wait(int pid, int block)
+{
+ int ret;
+
+ CATCH_EINTR(ret = waitpid(pid, NULL, WNOHANG));
+ if(ret < 0){
+ printk("helper_wait : waitpid failed, errno = %d\n", errno);
+ return(-errno);
+ }
+ return(ret);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/init_task.c b/arch/um/kernel/init_task.c
new file mode 100644
index 0000000..cd7c85b
--- /dev/null
+++ b/arch/um/kernel/init_task.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/mm.h"
+#include "linux/module.h"
+#include "linux/sched.h"
+#include "linux/init_task.h"
+#include "linux/mqueue.h"
+#include "asm/uaccess.h"
+#include "asm/pgtable.h"
+#include "user_util.h"
+#include "mem_user.h"
+
+static struct fs_struct init_fs = INIT_FS;
+struct mm_struct init_mm = INIT_MM(init_mm);
+static struct files_struct init_files = INIT_FILES;
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+EXPORT_SYMBOL(init_mm);
+
+/*
+ * Initial task structure.
+ *
+ * All other task structs will be allocated on slabs in fork.c
+ */
+
+struct task_struct init_task = INIT_TASK(init_task);
+
+EXPORT_SYMBOL(init_task);
+
+/*
+ * Initial thread structure.
+ *
+ * We need to make sure that this is 16384-byte aligned due to the
+ * way process stacks are handled. This is done by having a special
+ * "init_task" linker map entry..
+ */
+
+union thread_union init_thread_union
+__attribute__((__section__(".data.init_task"))) =
+{ INIT_THREAD_INFO(init_task) };
+
+void unprotect_stack(unsigned long stack)
+{
+ protect_memory(stack, (1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE,
+ 1, 1, 0, 1);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/initrd_kern.c b/arch/um/kernel/initrd_kern.c
new file mode 100644
index 0000000..fc568af
--- /dev/null
+++ b/arch/um/kernel/initrd_kern.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/init.h"
+#include "linux/bootmem.h"
+#include "linux/initrd.h"
+#include "asm/types.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "initrd.h"
+#include "init.h"
+#include "os.h"
+
+/* Changed by uml_initrd_setup, which is a setup */
+static char *initrd __initdata = NULL;
+
+static int __init read_initrd(void)
+{
+ void *area;
+ long long size;
+ int err;
+
+ if(initrd == NULL) return 0;
+ err = os_file_size(initrd, &size);
+ if(err) return 0;
+ area = alloc_bootmem(size);
+ if(area == NULL) return 0;
+ if(load_initrd(initrd, area, size) == -1) return 0;
+ initrd_start = (unsigned long) area;
+ initrd_end = initrd_start + size;
+ return 0;
+}
+
+__uml_postsetup(read_initrd);
+
+static int __init uml_initrd_setup(char *line, int *add)
+{
+ initrd = line;
+ return 0;
+}
+
+__uml_setup("initrd=", uml_initrd_setup,
+"initrd=<initrd image>\n"
+" This is used to boot UML from an initrd image. The argument is the\n"
+" name of the file containing the image.\n\n"
+);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/initrd_user.c b/arch/um/kernel/initrd_user.c
new file mode 100644
index 0000000..cb90681
--- /dev/null
+++ b/arch/um/kernel/initrd_user.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "initrd.h"
+#include "os.h"
+
+int load_initrd(char *filename, void *buf, int size)
+{
+ int fd, n;
+
+ fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
+ if(fd < 0){
+ printk("Opening '%s' failed - err = %d\n", filename, -fd);
+ return(-1);
+ }
+ n = os_read_file(fd, buf, size);
+ if(n != size){
+ printk("Read of %d bytes from '%s' failed, err = %d\n", size,
+ filename, -n);
+ return(-1);
+ }
+
+ os_close_file(fd);
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
new file mode 100644
index 0000000..d71e8f0
--- /dev/null
+++ b/arch/um/kernel/irq.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ * Derived (i.e. mostly copied) from arch/i386/kernel/irq.c:
+ * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
+ */
+
+#include "linux/config.h"
+#include "linux/kernel.h"
+#include "linux/module.h"
+#include "linux/smp.h"
+#include "linux/irq.h"
+#include "linux/kernel_stat.h"
+#include "linux/interrupt.h"
+#include "linux/random.h"
+#include "linux/slab.h"
+#include "linux/file.h"
+#include "linux/proc_fs.h"
+#include "linux/init.h"
+#include "linux/seq_file.h"
+#include "linux/profile.h"
+#include "linux/hardirq.h"
+#include "asm/irq.h"
+#include "asm/hw_irq.h"
+#include "asm/atomic.h"
+#include "asm/signal.h"
+#include "asm/system.h"
+#include "asm/errno.h"
+#include "asm/uaccess.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+
+
+/*
+ * Generic, controller-independent functions:
+ */
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+ int i = *(loff_t *) v, j;
+ struct irqaction * action;
+ unsigned long flags;
+
+ if (i == 0) {
+ seq_printf(p, " ");
+ for_each_online_cpu(j)
+ seq_printf(p, "CPU%d ",j);
+ seq_putc(p, '\n');
+ }
+
+ if (i < NR_IRQS) {
+ spin_lock_irqsave(&irq_desc[i].lock, flags);
+ action = irq_desc[i].action;
+ if (!action)
+ goto skip;
+ seq_printf(p, "%3d: ",i);
+#ifndef CONFIG_SMP
+ seq_printf(p, "%10u ", kstat_irqs(i));
+#else
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+#endif
+ seq_printf(p, " %14s", irq_desc[i].handler->typename);
+ seq_printf(p, " %s", action->name);
+
+ for (action=action->next; action; action = action->next)
+ seq_printf(p, ", %s", action->name);
+
+ seq_putc(p, '\n');
+skip:
+ spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+ } else if (i == NR_IRQS) {
+ seq_putc(p, '\n');
+ }
+
+ return 0;
+}
+
+/*
+ * do_IRQ handles all normal device IRQ's (the special
+ * SMP cross-CPU interrupts have their own specific
+ * handlers).
+ */
+unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
+{
+ irq_enter();
+ __do_IRQ(irq, (struct pt_regs *) regs);
+ irq_exit();
+ return 1;
+}
+
+int um_request_irq(unsigned int irq, int fd, int type,
+ irqreturn_t (*handler)(int, void *, struct pt_regs *),
+ unsigned long irqflags, const char * devname,
+ void *dev_id)
+{
+ int err;
+
+ err = request_irq(irq, handler, irqflags, devname, dev_id);
+ if(err)
+ return(err);
+
+ if(fd != -1)
+ err = activate_fd(irq, fd, type, dev_id);
+ return(err);
+}
+EXPORT_SYMBOL(um_request_irq);
+EXPORT_SYMBOL(reactivate_fd);
+
+static DEFINE_SPINLOCK(irq_spinlock);
+
+unsigned long irq_lock(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&irq_spinlock, flags);
+ return(flags);
+}
+
+void irq_unlock(unsigned long flags)
+{
+ spin_unlock_irqrestore(&irq_spinlock, flags);
+}
+
+/* presently hw_interrupt_type must define (startup || enable) &&
+ * disable && end */
+static void dummy(unsigned int irq)
+{
+}
+
+static struct hw_interrupt_type SIGIO_irq_type = {
+ .typename = "SIGIO",
+ .disable = dummy,
+ .enable = dummy,
+ .ack = dummy,
+ .end = dummy
+};
+
+static struct hw_interrupt_type SIGVTALRM_irq_type = {
+ .typename = "SIGVTALRM",
+ .shutdown = dummy, /* never called */
+ .disable = dummy,
+ .enable = dummy,
+ .ack = dummy,
+ .end = dummy
+};
+
+void __init init_IRQ(void)
+{
+ int i;
+
+ irq_desc[TIMER_IRQ].status = IRQ_DISABLED;
+ irq_desc[TIMER_IRQ].action = NULL;
+ irq_desc[TIMER_IRQ].depth = 1;
+ irq_desc[TIMER_IRQ].handler = &SIGVTALRM_irq_type;
+ enable_irq(TIMER_IRQ);
+ for(i=1;i<NR_IRQS;i++){
+ irq_desc[i].status = IRQ_DISABLED;
+ irq_desc[i].action = NULL;
+ irq_desc[i].depth = 1;
+ irq_desc[i].handler = &SIGIO_irq_type;
+ enable_irq(i);
+ }
+ init_irq_signals(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/irq_user.c b/arch/um/kernel/irq_user.c
new file mode 100644
index 0000000..6d6f948
--- /dev/null
+++ b/arch/um/kernel/irq_user.c
@@ -0,0 +1,443 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/poll.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "process.h"
+#include "signal_user.h"
+#include "sigio.h"
+#include "irq_user.h"
+#include "os.h"
+
+struct irq_fd {
+ struct irq_fd *next;
+ void *id;
+ int fd;
+ int type;
+ int irq;
+ int pid;
+ int events;
+ int current_events;
+ int freed;
+};
+
+static struct irq_fd *active_fds = NULL;
+static struct irq_fd **last_irq_ptr = &active_fds;
+
+static struct pollfd *pollfds = NULL;
+static int pollfds_num = 0;
+static int pollfds_size = 0;
+
+extern int io_count, intr_count;
+
+void sigio_handler(int sig, union uml_pt_regs *regs)
+{
+ struct irq_fd *irq_fd, *next;
+ int i, n;
+
+ if(smp_sigio_handler()) return;
+ while(1){
+ n = poll(pollfds, pollfds_num, 0);
+ if(n < 0){
+ if(errno == EINTR) continue;
+ printk("sigio_handler : poll returned %d, "
+ "errno = %d\n", n, errno);
+ break;
+ }
+ if(n == 0) break;
+
+ irq_fd = active_fds;
+ for(i = 0; i < pollfds_num; i++){
+ if(pollfds[i].revents != 0){
+ irq_fd->current_events = pollfds[i].revents;
+ pollfds[i].fd = -1;
+ }
+ irq_fd = irq_fd->next;
+ }
+
+ for(irq_fd = active_fds; irq_fd != NULL; irq_fd = next){
+ next = irq_fd->next;
+ if(irq_fd->current_events != 0){
+ irq_fd->current_events = 0;
+ do_IRQ(irq_fd->irq, regs);
+
+ /* This is here because the next irq may be
+ * freed in the handler. If a console goes
+ * away, both the read and write irqs will be
+ * freed. After do_IRQ, ->next will point to
+ * a good IRQ.
+ * Irqs can't be freed inside their handlers,
+ * so the next best thing is to have them
+ * marked as needing freeing, so that they
+ * can be freed here.
+ */
+ next = irq_fd->next;
+ if(irq_fd->freed){
+ free_irq(irq_fd->irq, irq_fd->id);
+ free_irq_by_irq_and_dev(irq_fd->irq,
+ irq_fd->id);
+ }
+ }
+ }
+ }
+}
+
+int activate_ipi(int fd, int pid)
+{
+ return(os_set_fd_async(fd, pid));
+}
+
+static void maybe_sigio_broken(int fd, int type)
+{
+ if(isatty(fd)){
+ if((type == IRQ_WRITE) && !pty_output_sigio){
+ write_sigio_workaround();
+ add_sigio_fd(fd, 0);
+ }
+ else if((type == IRQ_READ) && !pty_close_sigio){
+ write_sigio_workaround();
+ add_sigio_fd(fd, 1);
+ }
+ }
+}
+
+int activate_fd(int irq, int fd, int type, void *dev_id)
+{
+ struct pollfd *tmp_pfd;
+ struct irq_fd *new_fd, *irq_fd;
+ unsigned long flags;
+ int pid, events, err, n, size;
+
+ pid = os_getpid();
+ err = os_set_fd_async(fd, pid);
+ if(err < 0)
+ goto out;
+
+ new_fd = um_kmalloc(sizeof(*new_fd));
+ err = -ENOMEM;
+ if(new_fd == NULL)
+ goto out;
+
+ if(type == IRQ_READ) events = POLLIN | POLLPRI;
+ else events = POLLOUT;
+ *new_fd = ((struct irq_fd) { .next = NULL,
+ .id = dev_id,
+ .fd = fd,
+ .type = type,
+ .irq = irq,
+ .pid = pid,
+ .events = events,
+ .current_events = 0,
+ .freed = 0 } );
+
+ /* Critical section - locked by a spinlock because this stuff can
+ * be changed from interrupt handlers. The stuff above is done
+ * outside the lock because it allocates memory.
+ */
+
+ /* Actually, it only looks like it can be called from interrupt
+ * context. The culprit is reactivate_fd, which calls
+ * maybe_sigio_broken, which calls write_sigio_workaround,
+ * which calls activate_fd. However, write_sigio_workaround should
+ * only be called once, at boot time. That would make it clear that
+ * this is called only from process context, and can be locked with
+ * a semaphore.
+ */
+ flags = irq_lock();
+ for(irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next){
+ if((irq_fd->fd == fd) && (irq_fd->type == type)){
+ printk("Registering fd %d twice\n", fd);
+ printk("Irqs : %d, %d\n", irq_fd->irq, irq);
+ printk("Ids : 0x%x, 0x%x\n", irq_fd->id, dev_id);
+ goto out_unlock;
+ }
+ }
+
+ n = pollfds_num;
+ if(n == pollfds_size){
+ while(1){
+ /* Here we have to drop the lock in order to call
+ * kmalloc, which might sleep. If something else
+ * came in and changed the pollfds array, we free
+ * the buffer and try again.
+ */
+ irq_unlock(flags);
+ size = (pollfds_num + 1) * sizeof(pollfds[0]);
+ tmp_pfd = um_kmalloc(size);
+ flags = irq_lock();
+ if(tmp_pfd == NULL)
+ goto out_unlock;
+ if(n == pollfds_size)
+ break;
+ kfree(tmp_pfd);
+ }
+ if(pollfds != NULL){
+ memcpy(tmp_pfd, pollfds,
+ sizeof(pollfds[0]) * pollfds_size);
+ kfree(pollfds);
+ }
+ pollfds = tmp_pfd;
+ pollfds_size++;
+ }
+
+ if(type == IRQ_WRITE)
+ fd = -1;
+
+ pollfds[pollfds_num] = ((struct pollfd) { .fd = fd,
+ .events = events,
+ .revents = 0 });
+ pollfds_num++;
+
+ *last_irq_ptr = new_fd;
+ last_irq_ptr = &new_fd->next;
+
+ irq_unlock(flags);
+
+ /* This calls activate_fd, so it has to be outside the critical
+ * section.
+ */
+ maybe_sigio_broken(fd, type);
+
+ return(0);
+
+ out_unlock:
+ irq_unlock(flags);
+ kfree(new_fd);
+ out:
+ return(err);
+}
+
+static void free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg)
+{
+ struct irq_fd **prev;
+ unsigned long flags;
+ int i = 0;
+
+ flags = irq_lock();
+ prev = &active_fds;
+ while(*prev != NULL){
+ if((*test)(*prev, arg)){
+ struct irq_fd *old_fd = *prev;
+ if((pollfds[i].fd != -1) &&
+ (pollfds[i].fd != (*prev)->fd)){
+ printk("free_irq_by_cb - mismatch between "
+ "active_fds and pollfds, fd %d vs %d\n",
+ (*prev)->fd, pollfds[i].fd);
+ goto out;
+ }
+ memcpy(&pollfds[i], &pollfds[i + 1],
+ (pollfds_num - i - 1) * sizeof(pollfds[0]));
+ pollfds_num--;
+ if(last_irq_ptr == &old_fd->next)
+ last_irq_ptr = prev;
+ *prev = (*prev)->next;
+ if(old_fd->type == IRQ_WRITE)
+ ignore_sigio_fd(old_fd->fd);
+ kfree(old_fd);
+ continue;
+ }
+ prev = &(*prev)->next;
+ i++;
+ }
+ out:
+ irq_unlock(flags);
+}
+
+struct irq_and_dev {
+ int irq;
+ void *dev;
+};
+
+static int same_irq_and_dev(struct irq_fd *irq, void *d)
+{
+ struct irq_and_dev *data = d;
+
+ return((irq->irq == data->irq) && (irq->id == data->dev));
+}
+
+void free_irq_by_irq_and_dev(unsigned int irq, void *dev)
+{
+ struct irq_and_dev data = ((struct irq_and_dev) { .irq = irq,
+ .dev = dev });
+
+ free_irq_by_cb(same_irq_and_dev, &data);
+}
+
+static int same_fd(struct irq_fd *irq, void *fd)
+{
+ return(irq->fd == *((int *) fd));
+}
+
+void free_irq_by_fd(int fd)
+{
+ free_irq_by_cb(same_fd, &fd);
+}
+
+static struct irq_fd *find_irq_by_fd(int fd, int irqnum, int *index_out)
+{
+ struct irq_fd *irq;
+ int i = 0;
+
+ for(irq=active_fds; irq != NULL; irq = irq->next){
+ if((irq->fd == fd) && (irq->irq == irqnum)) break;
+ i++;
+ }
+ if(irq == NULL){
+ printk("find_irq_by_fd doesn't have descriptor %d\n", fd);
+ goto out;
+ }
+ if((pollfds[i].fd != -1) && (pollfds[i].fd != fd)){
+ printk("find_irq_by_fd - mismatch between active_fds and "
+ "pollfds, fd %d vs %d, need %d\n", irq->fd,
+ pollfds[i].fd, fd);
+ irq = NULL;
+ goto out;
+ }
+ *index_out = i;
+ out:
+ return(irq);
+}
+
+void free_irq_later(int irq, void *dev_id)
+{
+ struct irq_fd *irq_fd;
+ unsigned long flags;
+
+ flags = irq_lock();
+ for(irq_fd = active_fds; irq_fd != NULL; irq_fd = irq_fd->next){
+ if((irq_fd->irq == irq) && (irq_fd->id == dev_id))
+ break;
+ }
+ if(irq_fd == NULL){
+ printk("free_irq_later found no irq, irq = %d, "
+ "dev_id = 0x%p\n", irq, dev_id);
+ goto out;
+ }
+ irq_fd->freed = 1;
+ out:
+ irq_unlock(flags);
+}
+
+void reactivate_fd(int fd, int irqnum)
+{
+ struct irq_fd *irq;
+ unsigned long flags;
+ int i;
+
+ flags = irq_lock();
+ irq = find_irq_by_fd(fd, irqnum, &i);
+ if(irq == NULL){
+ irq_unlock(flags);
+ return;
+ }
+
+ pollfds[i].fd = irq->fd;
+
+ irq_unlock(flags);
+
+ /* This calls activate_fd, so it has to be outside the critical
+ * section.
+ */
+ maybe_sigio_broken(fd, irq->type);
+}
+
+void deactivate_fd(int fd, int irqnum)
+{
+ struct irq_fd *irq;
+ unsigned long flags;
+ int i;
+
+ flags = irq_lock();
+ irq = find_irq_by_fd(fd, irqnum, &i);
+ if(irq == NULL)
+ goto out;
+ pollfds[i].fd = -1;
+ out:
+ irq_unlock(flags);
+}
+
+int deactivate_all_fds(void)
+{
+ struct irq_fd *irq;
+ int err;
+
+ for(irq=active_fds;irq != NULL;irq = irq->next){
+ err = os_clear_fd_async(irq->fd);
+ if(err)
+ return(err);
+ }
+ /* If there is a signal already queued, after unblocking ignore it */
+ set_handler(SIGIO, SIG_IGN, 0, -1);
+
+ return(0);
+}
+
+void forward_ipi(int fd, int pid)
+{
+ int err;
+
+ err = os_set_owner(fd, pid);
+ if(err < 0)
+ printk("forward_ipi: set_owner failed, fd = %d, me = %d, "
+ "target = %d, err = %d\n", fd, os_getpid(), pid, -err);
+}
+
+void forward_interrupts(int pid)
+{
+ struct irq_fd *irq;
+ unsigned long flags;
+ int err;
+
+ flags = irq_lock();
+ for(irq=active_fds;irq != NULL;irq = irq->next){
+ err = os_set_owner(irq->fd, pid);
+ if(err < 0){
+ /* XXX Just remove the irq rather than
+ * print out an infinite stream of these
+ */
+ printk("Failed to forward %d to pid %d, err = %d\n",
+ irq->fd, pid, -err);
+ }
+
+ irq->pid = pid;
+ }
+ irq_unlock(flags);
+}
+
+void init_irq_signals(int on_sigstack)
+{
+ __sighandler_t h;
+ int flags;
+
+ flags = on_sigstack ? SA_ONSTACK : 0;
+ if(timer_irq_inited) h = (__sighandler_t) alarm_handler;
+ else h = boot_timer_handler;
+
+ set_handler(SIGVTALRM, h, flags | SA_RESTART,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, -1);
+ set_handler(SIGIO, (__sighandler_t) sig_handler, flags | SA_RESTART,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ signal(SIGWINCH, SIG_IGN);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
new file mode 100644
index 0000000..b41d339
--- /dev/null
+++ b/arch/um/kernel/ksyms.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2001 - 2004 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/module.h"
+#include "linux/string.h"
+#include "linux/smp_lock.h"
+#include "linux/spinlock.h"
+#include "linux/highmem.h"
+#include "asm/current.h"
+#include "asm/delay.h"
+#include "asm/processor.h"
+#include "asm/unistd.h"
+#include "asm/pgalloc.h"
+#include "asm/pgtable.h"
+#include "asm/page.h"
+#include "asm/tlbflush.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "os.h"
+#include "helper.h"
+
+EXPORT_SYMBOL(stop);
+EXPORT_SYMBOL(uml_physmem);
+EXPORT_SYMBOL(set_signals);
+EXPORT_SYMBOL(get_signals);
+EXPORT_SYMBOL(kernel_thread);
+EXPORT_SYMBOL(__const_udelay);
+EXPORT_SYMBOL(__udelay);
+EXPORT_SYMBOL(sys_waitpid);
+EXPORT_SYMBOL(task_size);
+EXPORT_SYMBOL(flush_tlb_range);
+EXPORT_SYMBOL(host_task_size);
+EXPORT_SYMBOL(arch_validate);
+EXPORT_SYMBOL(get_kmem_end);
+
+EXPORT_SYMBOL(page_to_phys);
+EXPORT_SYMBOL(phys_to_page);
+EXPORT_SYMBOL(high_physmem);
+EXPORT_SYMBOL(empty_zero_page);
+EXPORT_SYMBOL(um_virt_to_phys);
+EXPORT_SYMBOL(__virt_to_page);
+EXPORT_SYMBOL(to_phys);
+EXPORT_SYMBOL(to_virt);
+EXPORT_SYMBOL(mode_tt);
+EXPORT_SYMBOL(handle_page_fault);
+EXPORT_SYMBOL(find_iomem);
+EXPORT_SYMBOL(end_iomem);
+
+#ifdef CONFIG_MODE_TT
+EXPORT_SYMBOL(strncpy_from_user_tt);
+EXPORT_SYMBOL(copy_from_user_tt);
+EXPORT_SYMBOL(copy_to_user_tt);
+#endif
+
+#ifdef CONFIG_MODE_SKAS
+EXPORT_SYMBOL(strncpy_from_user_skas);
+EXPORT_SYMBOL(copy_to_user_skas);
+EXPORT_SYMBOL(copy_from_user_skas);
+#endif
+EXPORT_SYMBOL(uml_strdup);
+
+EXPORT_SYMBOL(os_stat_fd);
+EXPORT_SYMBOL(os_stat_file);
+EXPORT_SYMBOL(os_access);
+EXPORT_SYMBOL(os_print_error);
+EXPORT_SYMBOL(os_get_exec_close);
+EXPORT_SYMBOL(os_set_exec_close);
+EXPORT_SYMBOL(os_getpid);
+EXPORT_SYMBOL(os_open_file);
+EXPORT_SYMBOL(os_read_file);
+EXPORT_SYMBOL(os_write_file);
+EXPORT_SYMBOL(os_seek_file);
+EXPORT_SYMBOL(os_lock_file);
+EXPORT_SYMBOL(os_ioctl_generic);
+EXPORT_SYMBOL(os_pipe);
+EXPORT_SYMBOL(os_file_type);
+EXPORT_SYMBOL(os_file_mode);
+EXPORT_SYMBOL(os_file_size);
+EXPORT_SYMBOL(os_flush_stdout);
+EXPORT_SYMBOL(os_close_file);
+EXPORT_SYMBOL(os_set_fd_async);
+EXPORT_SYMBOL(os_set_fd_block);
+EXPORT_SYMBOL(helper_wait);
+EXPORT_SYMBOL(os_shutdown_socket);
+EXPORT_SYMBOL(os_create_unix_socket);
+EXPORT_SYMBOL(os_connect_socket);
+EXPORT_SYMBOL(os_accept_connection);
+EXPORT_SYMBOL(os_rcv_fd);
+EXPORT_SYMBOL(run_helper);
+EXPORT_SYMBOL(start_thread);
+EXPORT_SYMBOL(dump_thread);
+
+EXPORT_SYMBOL(do_gettimeofday);
+EXPORT_SYMBOL(do_settimeofday);
+
+/* This is here because UML expands open to sys_open, not to a system
+ * call instruction.
+ */
+EXPORT_SYMBOL(sys_open);
+EXPORT_SYMBOL(sys_lseek);
+EXPORT_SYMBOL(sys_read);
+EXPORT_SYMBOL(sys_wait4);
+
+#ifdef CONFIG_SMP
+
+/* required for SMP */
+
+extern void FASTCALL( __write_lock_failed(rwlock_t *rw));
+EXPORT_SYMBOL(__write_lock_failed);
+
+extern void FASTCALL( __read_lock_failed(rwlock_t *rw));
+EXPORT_SYMBOL(__read_lock_failed);
+
+#endif
+
+#ifdef CONFIG_HIGHMEM
+EXPORT_SYMBOL(kmap);
+EXPORT_SYMBOL(kunmap);
+EXPORT_SYMBOL(kmap_atomic);
+EXPORT_SYMBOL(kunmap_atomic);
+EXPORT_SYMBOL(kmap_atomic_to_page);
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/main.c b/arch/um/kernel/main.c
new file mode 100644
index 0000000..a17c497
--- /dev/null
+++ b/arch/um/kernel/main.c
@@ -0,0 +1,271 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/resource.h>
+#include <sys/mman.h>
+#include <sys/user.h>
+#include <asm/page.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "mem_user.h"
+#include "signal_user.h"
+#include "time_user.h"
+#include "irq_user.h"
+#include "user.h"
+#include "init.h"
+#include "mode.h"
+#include "choose-mode.h"
+#include "uml-config.h"
+#include "irq_user.h"
+#include "time_user.h"
+#include "os.h"
+
+/* Set in set_stklim, which is called from main and __wrap_malloc.
+ * __wrap_malloc only calls it if main hasn't started.
+ */
+unsigned long stacksizelim;
+
+/* Set in main */
+char *linux_prog;
+
+#define PGD_BOUND (4 * 1024 * 1024)
+#define STACKSIZE (8 * 1024 * 1024)
+#define THREAD_NAME_LEN (256)
+
+static void set_stklim(void)
+{
+ struct rlimit lim;
+
+ if(getrlimit(RLIMIT_STACK, &lim) < 0){
+ perror("getrlimit");
+ exit(1);
+ }
+ if((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)){
+ lim.rlim_cur = STACKSIZE;
+ if(setrlimit(RLIMIT_STACK, &lim) < 0){
+ perror("setrlimit");
+ exit(1);
+ }
+ }
+ stacksizelim = (lim.rlim_cur + PGD_BOUND - 1) & ~(PGD_BOUND - 1);
+}
+
+static __init void do_uml_initcalls(void)
+{
+ initcall_t *call;
+
+ call = &__uml_initcall_start;
+ while (call < &__uml_initcall_end){;
+ (*call)();
+ call++;
+ }
+}
+
+static void last_ditch_exit(int sig)
+{
+ CHOOSE_MODE(kmalloc_ok = 0, (void) 0);
+ signal(SIGINT, SIG_DFL);
+ signal(SIGTERM, SIG_DFL);
+ signal(SIGHUP, SIG_DFL);
+ uml_cleanup();
+ exit(1);
+}
+
+extern int uml_exitcode;
+
+extern void scan_elf_aux( char **envp);
+
+int main(int argc, char **argv, char **envp)
+{
+ char **new_argv;
+ sigset_t mask;
+ int ret, i;
+
+ /* Enable all signals except SIGIO - in some environments, we can
+ * enter with some signals blocked
+ */
+
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGIO);
+ if(sigprocmask(SIG_SETMASK, &mask, NULL) < 0){
+ perror("sigprocmask");
+ exit(1);
+ }
+
+#ifdef UML_CONFIG_MODE_TT
+ /* Allocate memory for thread command lines */
+ if(argc < 2 || strlen(argv[1]) < THREAD_NAME_LEN - 1){
+
+ char padding[THREAD_NAME_LEN] = {
+ [ 0 ... THREAD_NAME_LEN - 2] = ' ', '\0'
+ };
+
+ new_argv = malloc((argc + 2) * sizeof(char*));
+ if(!new_argv) {
+ perror("Allocating extended argv");
+ exit(1);
+ }
+
+ new_argv[0] = argv[0];
+ new_argv[1] = padding;
+
+ for(i = 2; i <= argc; i++)
+ new_argv[i] = argv[i - 1];
+ new_argv[argc + 1] = NULL;
+
+ execvp(new_argv[0], new_argv);
+ perror("execing with extended args");
+ exit(1);
+ }
+#endif
+
+ linux_prog = argv[0];
+
+ set_stklim();
+
+ new_argv = malloc((argc + 1) * sizeof(char *));
+ if(new_argv == NULL){
+ perror("Mallocing argv");
+ exit(1);
+ }
+ for(i=0;i<argc;i++){
+ new_argv[i] = strdup(argv[i]);
+ if(new_argv[i] == NULL){
+ perror("Mallocing an arg");
+ exit(1);
+ }
+ }
+ new_argv[argc] = NULL;
+
+ set_handler(SIGINT, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
+ set_handler(SIGTERM, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
+ set_handler(SIGHUP, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
+
+ scan_elf_aux( envp);
+
+ do_uml_initcalls();
+ ret = linux_main(argc, argv);
+
+ /* Disable SIGPROF - I have no idea why libc doesn't do this or turn
+ * off the profiling time, but UML dies with a SIGPROF just before
+ * exiting when profiling is active.
+ */
+ change_sig(SIGPROF, 0);
+
+ /* Reboot */
+ if(ret){
+ int err;
+
+ printf("\n");
+
+ /* stop timers and set SIG*ALRM to be ignored */
+ disable_timer();
+
+ /* disable SIGIO for the fds and set SIGIO to be ignored */
+ err = deactivate_all_fds();
+ if(err)
+ printf("deactivate_all_fds failed, errno = %d\n",
+ -err);
+
+ /* Let any pending signals fire now. This ensures
+ * that they won't be delivered after the exec, when
+ * they are definitely not expected.
+ */
+ unblock_signals();
+
+ execvp(new_argv[0], new_argv);
+ perror("Failed to exec kernel");
+ ret = 1;
+ }
+ printf("\n");
+ return(uml_exitcode);
+}
+
+#define CAN_KMALLOC() \
+ (kmalloc_ok && CHOOSE_MODE((os_getpid() != tracing_pid), 1))
+
+extern void *__real_malloc(int);
+
+void *__wrap_malloc(int size)
+{
+ void *ret;
+
+ if(!CAN_KMALLOC())
+ return(__real_malloc(size));
+ else if(size <= PAGE_SIZE) /* finding contiguos pages can be hard*/
+ ret = um_kmalloc(size);
+ else ret = um_vmalloc(size);
+
+ /* glibc people insist that if malloc fails, errno should be
+ * set by malloc as well. So we do.
+ */
+ if(ret == NULL)
+ errno = ENOMEM;
+
+ return(ret);
+}
+
+void *__wrap_calloc(int n, int size)
+{
+ void *ptr = __wrap_malloc(n * size);
+
+ if(ptr == NULL) return(NULL);
+ memset(ptr, 0, n * size);
+ return(ptr);
+}
+
+extern void __real_free(void *);
+
+extern unsigned long high_physmem;
+
+void __wrap_free(void *ptr)
+{
+ unsigned long addr = (unsigned long) ptr;
+
+ /* We need to know how the allocation happened, so it can be correctly
+ * freed. This is done by seeing what region of memory the pointer is
+ * in -
+ * physical memory - kmalloc/kfree
+ * kernel virtual memory - vmalloc/vfree
+ * anywhere else - malloc/free
+ * If kmalloc is not yet possible, then either high_physmem and/or
+ * end_vm are still 0 (as at startup), in which case we call free, or
+ * we have set them, but anyway addr has not been allocated from those
+ * areas. So, in both cases __real_free is called.
+ *
+ * CAN_KMALLOC is checked because it would be bad to free a buffer
+ * with kmalloc/vmalloc after they have been turned off during
+ * shutdown.
+ * XXX: However, we sometimes shutdown CAN_KMALLOC temporarily, so
+ * there is a possibility for memory leaks.
+ */
+
+ if((addr >= uml_physmem) && (addr < high_physmem)){
+ if(CAN_KMALLOC())
+ kfree(ptr);
+ }
+ else if((addr >= start_vm) && (addr < end_vm)){
+ if(CAN_KMALLOC())
+ vfree(ptr);
+ }
+ else __real_free(ptr);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
new file mode 100644
index 0000000..f156661
--- /dev/null
+++ b/arch/um/kernel/mem.c
@@ -0,0 +1,359 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/kernel.h"
+#include "linux/mm.h"
+#include "linux/bootmem.h"
+#include "linux/swap.h"
+#include "linux/highmem.h"
+#include "linux/gfp.h"
+#include "asm/page.h"
+#include "asm/fixmap.h"
+#include "asm/pgalloc.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "mem_user.h"
+#include "uml_uaccess.h"
+#include "os.h"
+
+extern char __binary_start;
+
+/* Changed during early boot */
+unsigned long *empty_zero_page = NULL;
+unsigned long *empty_bad_page = NULL;
+pgd_t swapper_pg_dir[PTRS_PER_PGD];
+unsigned long highmem;
+int kmalloc_ok = 0;
+
+static unsigned long brk_end;
+
+void unmap_physmem(void)
+{
+ os_unmap_memory((void *) brk_end, uml_reserved - brk_end);
+}
+
+static void map_cb(void *unused)
+{
+ map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
+}
+
+#ifdef CONFIG_HIGHMEM
+static void setup_highmem(unsigned long highmem_start,
+ unsigned long highmem_len)
+{
+ struct page *page;
+ unsigned long highmem_pfn;
+ int i;
+
+ highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT;
+ for(i = 0; i < highmem_len >> PAGE_SHIFT; i++){
+ page = &mem_map[highmem_pfn + i];
+ ClearPageReserved(page);
+ set_bit(PG_highmem, &page->flags);
+ set_page_count(page, 1);
+ __free_page(page);
+ }
+}
+#endif
+
+void mem_init(void)
+{
+ unsigned long start;
+
+ max_low_pfn = (high_physmem - uml_physmem) >> PAGE_SHIFT;
+
+ /* clear the zero-page */
+ memset((void *) empty_zero_page, 0, PAGE_SIZE);
+
+ /* Map in the area just after the brk now that kmalloc is about
+ * to be turned on.
+ */
+ brk_end = (unsigned long) UML_ROUND_UP(sbrk(0));
+ map_cb(NULL);
+ initial_thread_cb(map_cb, NULL);
+ free_bootmem(__pa(brk_end), uml_reserved - brk_end);
+ uml_reserved = brk_end;
+
+ /* Fill in any hole at the start of the binary */
+ start = (unsigned long) &__binary_start & PAGE_MASK;
+ if(uml_physmem != start){
+ map_memory(uml_physmem, __pa(uml_physmem), start - uml_physmem,
+ 1, 1, 0);
+ }
+
+ /* this will put all low memory onto the freelists */
+ totalram_pages = free_all_bootmem();
+ totalhigh_pages = highmem >> PAGE_SHIFT;
+ totalram_pages += totalhigh_pages;
+ num_physpages = totalram_pages;
+ max_pfn = totalram_pages;
+ printk(KERN_INFO "Memory: %luk available\n",
+ (unsigned long) nr_free_pages() << (PAGE_SHIFT-10));
+ kmalloc_ok = 1;
+
+#ifdef CONFIG_HIGHMEM
+ setup_highmem(end_iomem, highmem);
+#endif
+}
+
+static void __init fixrange_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *pte;
+ int i, j;
+ unsigned long vaddr;
+
+ vaddr = start;
+ i = pgd_index(vaddr);
+ j = pmd_index(vaddr);
+ pgd = pgd_base + i;
+
+ for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
+ pmd = (pmd_t *)pgd;
+ for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
+ if (pmd_none(*pmd)) {
+ pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ set_pmd(pmd, __pmd(_KERNPG_TABLE +
+ (unsigned long) __pa(pte)));
+ if (pte != pte_offset_kernel(pmd, 0))
+ BUG();
+ }
+ vaddr += PMD_SIZE;
+ }
+ j = 0;
+ }
+}
+
+#ifdef CONFIG_HIGHMEM
+pte_t *kmap_pte;
+pgprot_t kmap_prot;
+
+#define kmap_get_fixmap_pte(vaddr) \
+ pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\
+ (vaddr)), (vaddr))
+
+static void __init kmap_init(void)
+{
+ unsigned long kmap_vstart;
+
+ /* cache the first kmap pte */
+ kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
+ kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
+
+ kmap_prot = PAGE_KERNEL;
+}
+
+static void init_highmem(void)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long vaddr;
+
+ /*
+ * Permanent kmaps:
+ */
+ vaddr = PKMAP_BASE;
+ fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
+
+ pgd = swapper_pg_dir + pgd_index(vaddr);
+ pud = pud_offset(pgd, vaddr);
+ pmd = pmd_offset(pud, vaddr);
+ pte = pte_offset_kernel(pmd, vaddr);
+ pkmap_page_table = pte;
+
+ kmap_init();
+}
+#endif /* CONFIG_HIGHMEM */
+
+static void __init fixaddr_user_init( void)
+{
+#if CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
+ long size = FIXADDR_USER_END - FIXADDR_USER_START;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long paddr, vaddr = FIXADDR_USER_START;
+
+ if ( ! size )
+ return;
+
+ fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir);
+ paddr = (unsigned long)alloc_bootmem_low_pages( size);
+ memcpy( (void *)paddr, (void *)FIXADDR_USER_START, size);
+ paddr = __pa(paddr);
+ for ( ; size > 0; size-=PAGE_SIZE, vaddr+=PAGE_SIZE, paddr+=PAGE_SIZE){
+ pgd = swapper_pg_dir + pgd_index(vaddr);
+ pud = pud_offset(pgd, vaddr);
+ pmd = pmd_offset(pud, vaddr);
+ pte = pte_offset_kernel(pmd, vaddr);
+ pte_set_val( (*pte), paddr, PAGE_READONLY);
+ }
+#endif
+}
+
+void paging_init(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES], vaddr;
+ int i;
+
+ empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
+ empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
+ for(i=0;i<sizeof(zones_size)/sizeof(zones_size[0]);i++)
+ zones_size[i] = 0;
+ zones_size[0] = (end_iomem >> PAGE_SHIFT) - (uml_physmem >> PAGE_SHIFT);
+ zones_size[2] = highmem >> PAGE_SHIFT;
+ free_area_init(zones_size);
+
+ /*
+ * Fixed mappings, only the page table structure has to be
+ * created - mappings will be set by set_fixmap():
+ */
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
+
+ fixaddr_user_init();
+
+#ifdef CONFIG_HIGHMEM
+ init_highmem();
+#endif
+}
+
+struct page *arch_validate(struct page *page, int mask, int order)
+{
+ unsigned long addr, zero = 0;
+ int i;
+
+ again:
+ if(page == NULL) return(page);
+ if(PageHighMem(page)) return(page);
+
+ addr = (unsigned long) page_address(page);
+ for(i = 0; i < (1 << order); i++){
+ current->thread.fault_addr = (void *) addr;
+ if(__do_copy_to_user((void __user *) addr, &zero,
+ sizeof(zero),
+ ¤t->thread.fault_addr,
+ ¤t->thread.fault_catcher)){
+ if(!(mask & __GFP_WAIT)) return(NULL);
+ else break;
+ }
+ addr += PAGE_SIZE;
+ }
+
+ if(i == (1 << order)) return(page);
+ page = alloc_pages(mask, order);
+ goto again;
+}
+
+/* This can't do anything because nothing in the kernel image can be freed
+ * since it's not in kernel physical memory.
+ */
+
+void free_initmem(void)
+{
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ if (start < end)
+ printk ("Freeing initrd memory: %ldk freed\n",
+ (end - start) >> 10);
+ for (; start < end; start += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(start));
+ set_page_count(virt_to_page(start), 1);
+ free_page(start);
+ totalram_pages++;
+ }
+}
+
+#endif
+
+void show_mem(void)
+{
+ int pfn, total = 0, reserved = 0;
+ int shared = 0, cached = 0;
+ int highmem = 0;
+ struct page *page;
+
+ printk("Mem-info:\n");
+ show_free_areas();
+ printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+ pfn = max_mapnr;
+ while(pfn-- > 0) {
+ page = pfn_to_page(pfn);
+ total++;
+ if(PageHighMem(page))
+ highmem++;
+ if(PageReserved(page))
+ reserved++;
+ else if(PageSwapCache(page))
+ cached++;
+ else if(page_count(page))
+ shared += page_count(page) - 1;
+ }
+ printk("%d pages of RAM\n", total);
+ printk("%d pages of HIGHMEM\n", highmem);
+ printk("%d reserved pages\n", reserved);
+ printk("%d pages shared\n", shared);
+ printk("%d pages swap cached\n", cached);
+}
+
+/*
+ * Allocate and free page tables.
+ */
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
+
+ if (pgd) {
+ memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
+ memcpy(pgd + USER_PTRS_PER_PGD,
+ swapper_pg_dir + USER_PTRS_PER_PGD,
+ (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+ }
+ return pgd;
+}
+
+void pgd_free(pgd_t *pgd)
+{
+ free_page((unsigned long) pgd);
+}
+
+pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+{
+ pte_t *pte;
+
+ pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+ return pte;
+}
+
+struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+ struct page *pte;
+
+ pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+ return pte;
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/mem_user.c b/arch/um/kernel/mem_user.c
new file mode 100644
index 0000000..4a663fd
--- /dev/null
+++ b/arch/um/kernel/mem_user.c
@@ -0,0 +1,273 @@
+/*
+ * arch/um/kernel/mem_user.c
+ *
+ * BRIEF MODULE DESCRIPTION
+ * user side memory routines for supporting IO memory inside user mode linux
+ *
+ * Copyright (C) 2001 RidgeRun, Inc.
+ * Author: RidgeRun, Inc.
+ * Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include "kern_util.h"
+#include "user.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "init.h"
+#include "os.h"
+#include "tempfile.h"
+#include "kern_constants.h"
+
+#define TEMPNAME_TEMPLATE "vm_file-XXXXXX"
+
+static int create_tmp_file(unsigned long len)
+{
+ int fd, err;
+ char zero;
+
+ fd = make_tempfile(TEMPNAME_TEMPLATE, NULL, 1);
+ if(fd < 0) {
+ os_print_error(fd, "make_tempfile");
+ exit(1);
+ }
+
+ err = os_mode_fd(fd, 0777);
+ if(err < 0){
+ os_print_error(err, "os_mode_fd");
+ exit(1);
+ }
+ err = os_seek_file(fd, len);
+ if(err < 0){
+ os_print_error(err, "os_seek_file");
+ exit(1);
+ }
+ zero = 0;
+ err = os_write_file(fd, &zero, 1);
+ if(err != 1){
+ os_print_error(err, "os_write_file");
+ exit(1);
+ }
+
+ return(fd);
+}
+
+void check_tmpexec(void)
+{
+ void *addr;
+ int err, fd = create_tmp_file(UM_KERN_PAGE_SIZE);
+
+ addr = mmap(NULL, UM_KERN_PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0);
+ printf("Checking PROT_EXEC mmap in /tmp...");
+ fflush(stdout);
+ if(addr == MAP_FAILED){
+ err = errno;
+ perror("failed");
+ if(err == EPERM)
+ printf("/tmp must be not mounted noexec\n");
+ exit(1);
+ }
+ printf("OK\n");
+ munmap(addr, UM_KERN_PAGE_SIZE);
+
+ os_close_file(fd);
+}
+
+static int have_devanon = 0;
+
+void check_devanon(void)
+{
+ int fd;
+
+ printk("Checking for /dev/anon on the host...");
+ fd = open("/dev/anon", O_RDWR);
+ if(fd < 0){
+ printk("Not available (open failed with errno %d)\n", errno);
+ return;
+ }
+
+ printk("OK\n");
+ have_devanon = 1;
+}
+
+static int create_anon_file(unsigned long len)
+{
+ void *addr;
+ int fd;
+
+ fd = open("/dev/anon", O_RDWR);
+ if(fd < 0) {
+ os_print_error(fd, "opening /dev/anon");
+ exit(1);
+ }
+
+ addr = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+ if(addr == MAP_FAILED){
+ perror("mapping physmem file");
+ exit(1);
+ }
+ munmap(addr, len);
+
+ return(fd);
+}
+
+int create_mem_file(unsigned long len)
+{
+ int err, fd;
+
+ if(have_devanon)
+ fd = create_anon_file(len);
+ else fd = create_tmp_file(len);
+
+ err = os_set_exec_close(fd, 1);
+ if(err < 0)
+ os_print_error(err, "exec_close");
+ return(fd);
+}
+
+struct iomem_region *iomem_regions = NULL;
+int iomem_size = 0;
+
+static int __init parse_iomem(char *str, int *add)
+{
+ struct iomem_region *new;
+ struct uml_stat buf;
+ char *file, *driver;
+ int fd, err, size;
+
+ driver = str;
+ file = strchr(str,',');
+ if(file == NULL){
+ printf("parse_iomem : failed to parse iomem\n");
+ goto out;
+ }
+ *file = '\0';
+ file++;
+ fd = os_open_file(file, of_rdwr(OPENFLAGS()), 0);
+ if(fd < 0){
+ os_print_error(fd, "parse_iomem - Couldn't open io file");
+ goto out;
+ }
+
+ err = os_stat_fd(fd, &buf);
+ if(err < 0){
+ os_print_error(err, "parse_iomem - cannot stat_fd file");
+ goto out_close;
+ }
+
+ new = malloc(sizeof(*new));
+ if(new == NULL){
+ perror("Couldn't allocate iomem_region struct");
+ goto out_close;
+ }
+
+ size = (buf.ust_size + UM_KERN_PAGE_SIZE) & ~(UM_KERN_PAGE_SIZE - 1);
+
+ *new = ((struct iomem_region) { .next = iomem_regions,
+ .driver = driver,
+ .fd = fd,
+ .size = size,
+ .phys = 0,
+ .virt = 0 });
+ iomem_regions = new;
+ iomem_size += new->size + UM_KERN_PAGE_SIZE;
+
+ return(0);
+ out_close:
+ os_close_file(fd);
+ out:
+ return(1);
+}
+
+__uml_setup("iomem=", parse_iomem,
+"iomem=<name>,<file>\n"
+" Configure <file> as an IO memory region named <name>.\n\n"
+);
+
+int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
+ int must_succeed)
+{
+ int err;
+
+ err = os_protect_memory((void *) addr, len, r, w, x);
+ if(err < 0){
+ if(must_succeed)
+ panic("protect failed, err = %d", -err);
+ else return(err);
+ }
+ return(0);
+}
+
+#if 0
+/* Debugging facility for dumping stuff out to the host, avoiding the timing
+ * problems that come with printf and breakpoints.
+ * Enable in case of emergency.
+ */
+
+int logging = 1;
+int logging_fd = -1;
+
+int logging_line = 0;
+char logging_buf[512];
+
+void log(char *fmt, ...)
+{
+ va_list ap;
+ struct timeval tv;
+ struct openflags flags;
+
+ if(logging == 0) return;
+ if(logging_fd < 0){
+ flags = of_create(of_trunc(of_rdwr(OPENFLAGS())));
+ logging_fd = os_open_file("log", flags, 0644);
+ }
+ gettimeofday(&tv, NULL);
+ sprintf(logging_buf, "%d\t %u.%u ", logging_line++, tv.tv_sec,
+ tv.tv_usec);
+ va_start(ap, fmt);
+ vsprintf(&logging_buf[strlen(logging_buf)], fmt, ap);
+ va_end(ap);
+ write(logging_fd, logging_buf, strlen(logging_buf));
+}
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
new file mode 100644
index 0000000..420e6d5
--- /dev/null
+++ b/arch/um/kernel/physmem.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/mm.h"
+#include "linux/rbtree.h"
+#include "linux/slab.h"
+#include "linux/vmalloc.h"
+#include "linux/bootmem.h"
+#include "linux/module.h"
+#include "asm/types.h"
+#include "asm/pgtable.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "mode_kern.h"
+#include "mem.h"
+#include "mem_user.h"
+#include "os.h"
+#include "kern.h"
+#include "init.h"
+
+struct phys_desc {
+ struct rb_node rb;
+ int fd;
+ __u64 offset;
+ void *virt;
+ unsigned long phys;
+ struct list_head list;
+};
+
+static struct rb_root phys_mappings = RB_ROOT;
+
+static struct rb_node **find_rb(void *virt)
+{
+ struct rb_node **n = &phys_mappings.rb_node;
+ struct phys_desc *d;
+
+ while(*n != NULL){
+ d = rb_entry(*n, struct phys_desc, rb);
+ if(d->virt == virt)
+ return(n);
+
+ if(d->virt > virt)
+ n = &(*n)->rb_left;
+ else
+ n = &(*n)->rb_right;
+ }
+
+ return(n);
+}
+
+static struct phys_desc *find_phys_mapping(void *virt)
+{
+ struct rb_node **n = find_rb(virt);
+
+ if(*n == NULL)
+ return(NULL);
+
+ return(rb_entry(*n, struct phys_desc, rb));
+}
+
+static void insert_phys_mapping(struct phys_desc *desc)
+{
+ struct rb_node **n = find_rb(desc->virt);
+
+ if(*n != NULL)
+ panic("Physical remapping for %p already present",
+ desc->virt);
+
+ rb_link_node(&desc->rb, (*n)->rb_parent, n);
+ rb_insert_color(&desc->rb, &phys_mappings);
+}
+
+LIST_HEAD(descriptor_mappings);
+
+struct desc_mapping {
+ int fd;
+ struct list_head list;
+ struct list_head pages;
+};
+
+static struct desc_mapping *find_mapping(int fd)
+{
+ struct desc_mapping *desc;
+ struct list_head *ele;
+
+ list_for_each(ele, &descriptor_mappings){
+ desc = list_entry(ele, struct desc_mapping, list);
+ if(desc->fd == fd)
+ return(desc);
+ }
+
+ return(NULL);
+}
+
+static struct desc_mapping *descriptor_mapping(int fd)
+{
+ struct desc_mapping *desc;
+
+ desc = find_mapping(fd);
+ if(desc != NULL)
+ return(desc);
+
+ desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
+ if(desc == NULL)
+ return(NULL);
+
+ *desc = ((struct desc_mapping)
+ { .fd = fd,
+ .list = LIST_HEAD_INIT(desc->list),
+ .pages = LIST_HEAD_INIT(desc->pages) });
+ list_add(&desc->list, &descriptor_mappings);
+
+ return(desc);
+}
+
+int physmem_subst_mapping(void *virt, int fd, __u64 offset, int w)
+{
+ struct desc_mapping *fd_maps;
+ struct phys_desc *desc;
+ unsigned long phys;
+ int err;
+
+ fd_maps = descriptor_mapping(fd);
+ if(fd_maps == NULL)
+ return(-ENOMEM);
+
+ phys = __pa(virt);
+ desc = find_phys_mapping(virt);
+ if(desc != NULL)
+ panic("Address 0x%p is already substituted\n", virt);
+
+ err = -ENOMEM;
+ desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
+ if(desc == NULL)
+ goto out;
+
+ *desc = ((struct phys_desc)
+ { .fd = fd,
+ .offset = offset,
+ .virt = virt,
+ .phys = __pa(virt),
+ .list = LIST_HEAD_INIT(desc->list) });
+ insert_phys_mapping(desc);
+
+ list_add(&desc->list, &fd_maps->pages);
+
+ virt = (void *) ((unsigned long) virt & PAGE_MASK);
+ err = os_map_memory(virt, fd, offset, PAGE_SIZE, 1, w, 0);
+ if(!err)
+ goto out;
+
+ rb_erase(&desc->rb, &phys_mappings);
+ kfree(desc);
+ out:
+ return(err);
+}
+
+static int physmem_fd = -1;
+
+static void remove_mapping(struct phys_desc *desc)
+{
+ void *virt = desc->virt;
+ int err;
+
+ rb_erase(&desc->rb, &phys_mappings);
+ list_del(&desc->list);
+ kfree(desc);
+
+ err = os_map_memory(virt, physmem_fd, __pa(virt), PAGE_SIZE, 1, 1, 0);
+ if(err)
+ panic("Failed to unmap block device page from physical memory, "
+ "errno = %d", -err);
+}
+
+int physmem_remove_mapping(void *virt)
+{
+ struct phys_desc *desc;
+
+ virt = (void *) ((unsigned long) virt & PAGE_MASK);
+ desc = find_phys_mapping(virt);
+ if(desc == NULL)
+ return(0);
+
+ remove_mapping(desc);
+ return(1);
+}
+
+void physmem_forget_descriptor(int fd)
+{
+ struct desc_mapping *desc;
+ struct phys_desc *page;
+ struct list_head *ele, *next;
+ __u64 offset;
+ void *addr;
+ int err;
+
+ desc = find_mapping(fd);
+ if(desc == NULL)
+ return;
+
+ list_for_each_safe(ele, next, &desc->pages){
+ page = list_entry(ele, struct phys_desc, list);
+ offset = page->offset;
+ addr = page->virt;
+ remove_mapping(page);
+ err = os_seek_file(fd, offset);
+ if(err)
+ panic("physmem_forget_descriptor - failed to seek "
+ "to %lld in fd %d, error = %d\n",
+ offset, fd, -err);
+ err = os_read_file(fd, addr, PAGE_SIZE);
+ if(err < 0)
+ panic("physmem_forget_descriptor - failed to read "
+ "from fd %d to 0x%p, error = %d\n",
+ fd, addr, -err);
+ }
+
+ list_del(&desc->list);
+ kfree(desc);
+}
+
+EXPORT_SYMBOL(physmem_forget_descriptor);
+EXPORT_SYMBOL(physmem_remove_mapping);
+EXPORT_SYMBOL(physmem_subst_mapping);
+
+void arch_free_page(struct page *page, int order)
+{
+ void *virt;
+ int i;
+
+ for(i = 0; i < (1 << order); i++){
+ virt = __va(page_to_phys(page + i));
+ physmem_remove_mapping(virt);
+ }
+}
+
+int is_remapped(void *virt)
+{
+ struct phys_desc *desc = find_phys_mapping(virt);
+
+ return(desc != NULL);
+}
+
+/* Changed during early boot */
+unsigned long high_physmem;
+
+extern unsigned long physmem_size;
+
+void *to_virt(unsigned long phys)
+{
+ return((void *) uml_physmem + phys);
+}
+
+unsigned long to_phys(void *virt)
+{
+ return(((unsigned long) virt) - uml_physmem);
+}
+
+int init_maps(unsigned long physmem, unsigned long iomem, unsigned long highmem)
+{
+ struct page *p, *map;
+ unsigned long phys_len, phys_pages, highmem_len, highmem_pages;
+ unsigned long iomem_len, iomem_pages, total_len, total_pages;
+ int i;
+
+ phys_pages = physmem >> PAGE_SHIFT;
+ phys_len = phys_pages * sizeof(struct page);
+
+ iomem_pages = iomem >> PAGE_SHIFT;
+ iomem_len = iomem_pages * sizeof(struct page);
+
+ highmem_pages = highmem >> PAGE_SHIFT;
+ highmem_len = highmem_pages * sizeof(struct page);
+
+ total_pages = phys_pages + iomem_pages + highmem_pages;
+ total_len = phys_len + iomem_pages + highmem_len;
+
+ if(kmalloc_ok){
+ map = kmalloc(total_len, GFP_KERNEL);
+ if(map == NULL)
+ map = vmalloc(total_len);
+ }
+ else map = alloc_bootmem_low_pages(total_len);
+
+ if(map == NULL)
+ return(-ENOMEM);
+
+ for(i = 0; i < total_pages; i++){
+ p = &map[i];
+ set_page_count(p, 0);
+ SetPageReserved(p);
+ INIT_LIST_HEAD(&p->lru);
+ }
+
+ max_mapnr = total_pages;
+ return(0);
+}
+
+struct page *phys_to_page(const unsigned long phys)
+{
+ return(&mem_map[phys >> PAGE_SHIFT]);
+}
+
+struct page *__virt_to_page(const unsigned long virt)
+{
+ return(&mem_map[__pa(virt) >> PAGE_SHIFT]);
+}
+
+phys_t page_to_phys(struct page *page)
+{
+ return((page - mem_map) << PAGE_SHIFT);
+}
+
+pte_t mk_pte(struct page *page, pgprot_t pgprot)
+{
+ pte_t pte;
+
+ pte_set_val(pte, page_to_phys(page), pgprot);
+ if(pte_present(pte))
+ pte_mknewprot(pte_mknewpage(pte));
+ return(pte);
+}
+
+/* Changed during early boot */
+static unsigned long kmem_top = 0;
+
+unsigned long get_kmem_end(void)
+{
+ if(kmem_top == 0)
+ kmem_top = CHOOSE_MODE(kmem_end_tt, kmem_end_skas);
+ return(kmem_top);
+}
+
+void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
+ int r, int w, int x)
+{
+ __u64 offset;
+ int fd, err;
+
+ fd = phys_mapping(phys, &offset);
+ err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
+ if(err) {
+ if(err == -ENOMEM)
+ printk("try increasing the host's "
+ "/proc/sys/vm/max_map_count to <physical "
+ "memory size>/4096\n");
+ panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
+ "err = %d\n", virt, fd, offset, len, r, w, x, err);
+ }
+}
+
+#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+
+void setup_physmem(unsigned long start, unsigned long reserve_end,
+ unsigned long len, unsigned long highmem)
+{
+ unsigned long reserve = reserve_end - start;
+ int pfn = PFN_UP(__pa(reserve_end));
+ int delta = (len - reserve) >> PAGE_SHIFT;
+ int err, offset, bootmap_size;
+
+ physmem_fd = create_mem_file(len + highmem);
+
+ offset = uml_reserved - uml_physmem;
+ err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
+ len - offset, 1, 1, 0);
+ if(err < 0){
+ os_print_error(err, "Mapping memory");
+ exit(1);
+ }
+
+ bootmap_size = init_bootmem(pfn, pfn + delta);
+ free_bootmem(__pa(reserve_end) + bootmap_size,
+ len - bootmap_size - reserve);
+}
+
+int phys_mapping(unsigned long phys, __u64 *offset_out)
+{
+ struct phys_desc *desc = find_phys_mapping(__va(phys & PAGE_MASK));
+ int fd = -1;
+
+ if(desc != NULL){
+ fd = desc->fd;
+ *offset_out = desc->offset;
+ }
+ else if(phys < physmem_size){
+ fd = physmem_fd;
+ *offset_out = phys;
+ }
+ else if(phys < __pa(end_iomem)){
+ struct iomem_region *region = iomem_regions;
+
+ while(region != NULL){
+ if((phys >= region->phys) &&
+ (phys < region->phys + region->size)){
+ fd = region->fd;
+ *offset_out = phys - region->phys;
+ break;
+ }
+ region = region->next;
+ }
+ }
+ else if(phys < __pa(end_iomem) + highmem){
+ fd = physmem_fd;
+ *offset_out = phys - iomem_size;
+ }
+
+ return(fd);
+}
+
+static int __init uml_mem_setup(char *line, int *add)
+{
+ char *retptr;
+ physmem_size = memparse(line,&retptr);
+ return 0;
+}
+__uml_setup("mem=", uml_mem_setup,
+"mem=<Amount of desired ram>\n"
+" This controls how much \"physical\" memory the kernel allocates\n"
+" for the system. The size is specified as a number followed by\n"
+" one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n"
+" This is not related to the amount of memory in the host. It can\n"
+" be more, and the excess, if it's ever used, will just be swapped out.\n"
+" Example: mem=64M\n\n"
+);
+
+unsigned long find_iomem(char *driver, unsigned long *len_out)
+{
+ struct iomem_region *region = iomem_regions;
+
+ while(region != NULL){
+ if(!strcmp(region->driver, driver)){
+ *len_out = region->size;
+ return(region->virt);
+ }
+ }
+
+ return(0);
+}
+
+int setup_iomem(void)
+{
+ struct iomem_region *region = iomem_regions;
+ unsigned long iomem_start = high_physmem + PAGE_SIZE;
+ int err;
+
+ while(region != NULL){
+ err = os_map_memory((void *) iomem_start, region->fd, 0,
+ region->size, 1, 1, 0);
+ if(err)
+ printk("Mapping iomem region for driver '%s' failed, "
+ "errno = %d\n", region->driver, -err);
+ else {
+ region->virt = iomem_start;
+ region->phys = __pa(region->virt);
+ }
+
+ iomem_start += region->size + PAGE_SIZE;
+ region = region->next;
+ }
+
+ return(0);
+}
+
+__initcall(setup_iomem);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
new file mode 100644
index 0000000..f76a269
--- /dev/null
+++ b/arch/um/kernel/process.c
@@ -0,0 +1,423 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sched.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
+#include <asm/unistd.h>
+#include <asm/page.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "process.h"
+#include "signal_kern.h"
+#include "signal_user.h"
+#include "sysdep/ptrace.h"
+#include "sysdep/sigcontext.h"
+#include "irq_user.h"
+#include "ptrace_user.h"
+#include "time_user.h"
+#include "init.h"
+#include "os.h"
+#include "uml-config.h"
+#include "ptrace_user.h"
+#include "choose-mode.h"
+#include "mode.h"
+#ifdef UML_CONFIG_MODE_SKAS
+#include "skas.h"
+#include "skas_ptrace.h"
+#include "registers.h"
+#endif
+
+void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
+{
+ int flags = 0, pages;
+
+ if(sig_stack != NULL){
+ pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
+ set_sigstack(sig_stack, pages * page_size());
+ flags = SA_ONSTACK;
+ }
+ if(usr1_handler) set_handler(SIGUSR1, usr1_handler, flags, -1);
+}
+
+void init_new_thread_signals(int altstack)
+{
+ int flags = altstack ? SA_ONSTACK : 0;
+
+ set_handler(SIGSEGV, (__sighandler_t) sig_handler, flags,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGTRAP, (__sighandler_t) sig_handler, flags,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGFPE, (__sighandler_t) sig_handler, flags,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGILL, (__sighandler_t) sig_handler, flags,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGBUS, (__sighandler_t) sig_handler, flags,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGWINCH, (__sighandler_t) sig_handler, flags,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGUSR2, (__sighandler_t) sig_handler,
+ flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ signal(SIGHUP, SIG_IGN);
+
+ init_irq_signals(altstack);
+}
+
+struct tramp {
+ int (*tramp)(void *);
+ void *tramp_data;
+ unsigned long temp_stack;
+ int flags;
+ int pid;
+};
+
+/* See above for why sigkill is here */
+
+int sigkill = SIGKILL;
+
+int outer_tramp(void *arg)
+{
+ struct tramp *t;
+ int sig = sigkill;
+
+ t = arg;
+ t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
+ t->flags, t->tramp_data);
+ if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
+ kill(os_getpid(), sig);
+ _exit(0);
+}
+
+int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
+ int clone_flags, int (*tramp)(void *))
+{
+ struct tramp arg;
+ unsigned long sp;
+ int new_pid, status, err;
+
+ /* The trampoline will run on the temporary stack */
+ sp = stack_sp(temp_stack);
+
+ clone_flags |= CLONE_FILES | SIGCHLD;
+
+ arg.tramp = tramp;
+ arg.tramp_data = thread_arg;
+ arg.temp_stack = temp_stack;
+ arg.flags = clone_flags;
+
+ /* Start the process and wait for it to kill itself */
+ new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
+ if(new_pid < 0)
+ return(new_pid);
+
+ CATCH_EINTR(err = waitpid(new_pid, &status, 0));
+ if(err < 0)
+ panic("Waiting for outer trampoline failed - errno = %d",
+ errno);
+
+ if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
+ panic("outer trampoline didn't exit with SIGKILL, "
+ "status = %d", status);
+
+ return(arg.pid);
+}
+
+static int ptrace_child(void *arg)
+{
+ int ret;
+ int pid = os_getpid(), ppid = getppid();
+ int sc_result;
+
+ if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
+ perror("ptrace");
+ os_kill_process(pid, 0);
+ }
+ os_stop_process(pid);
+
+ /*This syscall will be intercepted by the parent. Don't call more than
+ * once, please.*/
+ sc_result = os_getpid();
+
+ if (sc_result == pid)
+ ret = 1; /*Nothing modified by the parent, we are running
+ normally.*/
+ else if (sc_result == ppid)
+ ret = 0; /*Expected in check_ptrace and check_sysemu when they
+ succeed in modifying the stack frame*/
+ else
+ ret = 2; /*Serious trouble! This could be caused by a bug in
+ host 2.6 SKAS3/2.6 patch before release -V6, together
+ with a bug in the UML code itself.*/
+ _exit(ret);
+}
+
+static int start_ptraced_child(void **stack_out)
+{
+ void *stack;
+ unsigned long sp;
+ int pid, n, status;
+
+ stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if(stack == MAP_FAILED)
+ panic("check_ptrace : mmap failed, errno = %d", errno);
+ sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
+ pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
+ if(pid < 0)
+ panic("check_ptrace : clone failed, errno = %d", errno);
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if(n < 0)
+ panic("check_ptrace : wait failed, errno = %d", errno);
+ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
+ panic("check_ptrace : expected SIGSTOP, got status = %d",
+ status);
+
+ *stack_out = stack;
+ return(pid);
+}
+
+/* When testing for SYSEMU support, if it is one of the broken versions, we must
+ * just avoid using sysemu, not panic, but only if SYSEMU features are broken.
+ * So only for SYSEMU features we test mustpanic, while normal host features
+ * must work anyway!*/
+static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
+{
+ int status, n, ret = 0;
+
+ if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
+ panic("check_ptrace : ptrace failed, errno = %d", errno);
+ CATCH_EINTR(n = waitpid(pid, &status, 0));
+ if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
+ int exit_with = WEXITSTATUS(status);
+ if (exit_with == 2)
+ printk("check_ptrace : child exited with status 2. "
+ "Serious trouble happening! Try updating your "
+ "host skas patch!\nDisabling SYSEMU support.");
+ printk("check_ptrace : child exited with exitcode %d, while "
+ "expecting %d; status 0x%x", exit_with,
+ exitcode, status);
+ if (mustpanic)
+ panic("\n");
+ else
+ printk("\n");
+ ret = -1;
+ }
+
+ if(munmap(stack, PAGE_SIZE) < 0)
+ panic("check_ptrace : munmap failed, errno = %d", errno);
+ return ret;
+}
+
+static int force_sysemu_disabled = 0;
+
+static int __init nosysemu_cmd_param(char *str, int* add)
+{
+ force_sysemu_disabled = 1;
+ return 0;
+}
+
+__uml_setup("nosysemu", nosysemu_cmd_param,
+ "nosysemu\n"
+ " Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
+ " SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
+ " behaviour of ptrace() and helps reducing host context switch rate.\n"
+ " To make it working, you need a kernel patch for your host, too.\n"
+ " See http://perso.wanadoo.fr/laurent.vivier/UML/ for further information.\n\n");
+
+static void __init check_sysemu(void)
+{
+ void *stack;
+ int pid, syscall, n, status, count=0;
+
+ printk("Checking syscall emulation patch for ptrace...");
+ sysemu_supported = 0;
+ pid = start_ptraced_child(&stack);
+
+ if(ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
+ goto fail;
+
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if (n < 0)
+ panic("check_sysemu : wait failed, errno = %d", errno);
+ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
+ panic("check_sysemu : expected SIGTRAP, "
+ "got status = %d", status);
+
+ n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
+ os_getpid());
+ if(n < 0)
+ panic("check_sysemu : failed to modify system "
+ "call return, errno = %d", errno);
+
+ if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+ goto fail_stopped;
+
+ sysemu_supported = 1;
+ printk("OK\n");
+ set_using_sysemu(!force_sysemu_disabled);
+
+ printk("Checking advanced syscall emulation patch for ptrace...");
+ pid = start_ptraced_child(&stack);
+ while(1){
+ count++;
+ if(ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
+ goto fail;
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if(n < 0)
+ panic("check_ptrace : wait failed, errno = %d", errno);
+ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
+ panic("check_ptrace : expected (SIGTRAP|SYSCALL_TRAP), "
+ "got status = %d", status);
+
+ syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET,
+ 0);
+ if(syscall == __NR_getpid){
+ if (!count)
+ panic("check_ptrace : SYSEMU_SINGLESTEP doesn't singlestep");
+ n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
+ os_getpid());
+ if(n < 0)
+ panic("check_sysemu : failed to modify system "
+ "call return, errno = %d", errno);
+ break;
+ }
+ }
+ if (stop_ptraced_child(pid, stack, 0, 0) < 0)
+ goto fail_stopped;
+
+ sysemu_supported = 2;
+ printk("OK\n");
+
+ if ( !force_sysemu_disabled )
+ set_using_sysemu(sysemu_supported);
+ return;
+
+fail:
+ stop_ptraced_child(pid, stack, 1, 0);
+fail_stopped:
+ printk("missing\n");
+}
+
+void __init check_ptrace(void)
+{
+ void *stack;
+ int pid, syscall, n, status;
+
+ printk("Checking that ptrace can change system call numbers...");
+ pid = start_ptraced_child(&stack);
+
+ if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
+ panic("check_ptrace: PTRACE_SETOPTIONS failed, errno = %d", errno);
+
+ while(1){
+ if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
+ panic("check_ptrace : ptrace failed, errno = %d",
+ errno);
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if(n < 0)
+ panic("check_ptrace : wait failed, errno = %d", errno);
+ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP + 0x80))
+ panic("check_ptrace : expected SIGTRAP + 0x80, "
+ "got status = %d", status);
+
+ syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET,
+ 0);
+ if(syscall == __NR_getpid){
+ n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
+ __NR_getppid);
+ if(n < 0)
+ panic("check_ptrace : failed to modify system "
+ "call, errno = %d", errno);
+ break;
+ }
+ }
+ stop_ptraced_child(pid, stack, 0, 1);
+ printk("OK\n");
+ check_sysemu();
+}
+
+int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
+{
+ sigjmp_buf buf;
+ int n;
+
+ *jmp_ptr = &buf;
+ n = sigsetjmp(buf, 1);
+ if(n != 0)
+ return(n);
+ (*fn)(arg);
+ return(0);
+}
+
+void forward_pending_sigio(int target)
+{
+ sigset_t sigs;
+
+ if(sigpending(&sigs))
+ panic("forward_pending_sigio : sigpending failed");
+ if(sigismember(&sigs, SIGIO))
+ kill(target, SIGIO);
+}
+
+#ifdef UML_CONFIG_MODE_SKAS
+static inline int check_skas3_ptrace_support(void)
+{
+ struct ptrace_faultinfo fi;
+ void *stack;
+ int pid, n, ret = 1;
+
+ printf("Checking for the skas3 patch in the host...");
+ pid = start_ptraced_child(&stack);
+
+ n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
+ if (n < 0) {
+ if(errno == EIO)
+ printf("not found\n");
+ else {
+ perror("not found");
+ }
+ ret = 0;
+ } else {
+ printf("found\n");
+ }
+
+ init_registers(pid);
+ stop_ptraced_child(pid, stack, 1, 1);
+
+ return(ret);
+}
+
+int can_do_skas(void)
+{
+ int ret = 1;
+
+ printf("Checking for /proc/mm...");
+ if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
+ printf("not found\n");
+ ret = 0;
+ goto out;
+ } else {
+ printf("found\n");
+ }
+
+ ret = check_skas3_ptrace_support();
+out:
+ return ret;
+}
+#else
+int can_do_skas(void)
+{
+ return(0);
+}
+#endif
diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c
new file mode 100644
index 0000000..1d719d5
--- /dev/null
+++ b/arch/um/kernel/process_kern.c
@@ -0,0 +1,500 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/kernel.h"
+#include "linux/sched.h"
+#include "linux/interrupt.h"
+#include "linux/mm.h"
+#include "linux/slab.h"
+#include "linux/utsname.h"
+#include "linux/fs.h"
+#include "linux/utime.h"
+#include "linux/smp_lock.h"
+#include "linux/module.h"
+#include "linux/init.h"
+#include "linux/capability.h"
+#include "linux/vmalloc.h"
+#include "linux/spinlock.h"
+#include "linux/proc_fs.h"
+#include "linux/ptrace.h"
+#include "linux/random.h"
+#include "asm/unistd.h"
+#include "asm/mman.h"
+#include "asm/segment.h"
+#include "asm/stat.h"
+#include "asm/pgtable.h"
+#include "asm/processor.h"
+#include "asm/tlbflush.h"
+#include "asm/uaccess.h"
+#include "asm/user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "signal_kern.h"
+#include "signal_user.h"
+#include "init.h"
+#include "irq_user.h"
+#include "mem_user.h"
+#include "time_user.h"
+#include "tlb.h"
+#include "frame_kern.h"
+#include "sigcontext.h"
+#include "2_5compat.h"
+#include "os.h"
+#include "mode.h"
+#include "mode_kern.h"
+#include "choose-mode.h"
+
+/* This is a per-cpu array. A processor only modifies its entry and it only
+ * cares about its entry, so it's OK if another processor is modifying its
+ * entry.
+ */
+struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
+
+struct task_struct *get_task(int pid, int require)
+{
+ struct task_struct *ret;
+
+ read_lock(&tasklist_lock);
+ ret = find_task_by_pid(pid);
+ read_unlock(&tasklist_lock);
+
+ if(require && (ret == NULL)) panic("get_task couldn't find a task\n");
+ return(ret);
+}
+
+int external_pid(void *t)
+{
+ struct task_struct *task = t ? t : current;
+
+ return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
+}
+
+int pid_to_processor_id(int pid)
+{
+ int i;
+
+ for(i = 0; i < ncpus; i++){
+ if(cpu_tasks[i].pid == pid) return(i);
+ }
+ return(-1);
+}
+
+void free_stack(unsigned long stack, int order)
+{
+ free_pages(stack, order);
+}
+
+unsigned long alloc_stack(int order, int atomic)
+{
+ unsigned long page;
+ int flags = GFP_KERNEL;
+
+ if(atomic) flags |= GFP_ATOMIC;
+ page = __get_free_pages(flags, order);
+ if(page == 0)
+ return(0);
+ stack_protections(page);
+ return(page);
+}
+
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+ int pid;
+
+ current->thread.request.u.thread.proc = fn;
+ current->thread.request.u.thread.arg = arg;
+ pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, NULL, 0, NULL,
+ NULL);
+ if(pid < 0)
+ panic("do_fork failed in kernel_thread, errno = %d", pid);
+ return(pid);
+}
+
+void switch_mm(struct mm_struct *prev, struct mm_struct *next,
+ struct task_struct *tsk)
+{
+ int cpu = smp_processor_id();
+
+ if (prev != next)
+ cpu_clear(cpu, prev->cpu_vm_mask);
+ cpu_set(cpu, next->cpu_vm_mask);
+}
+
+void set_current(void *t)
+{
+ struct task_struct *task = t;
+
+ cpu_tasks[task->thread_info->cpu] = ((struct cpu_task)
+ { external_pid(task), task });
+}
+
+void *_switch_to(void *prev, void *next, void *last)
+{
+ return(CHOOSE_MODE(switch_to_tt(prev, next),
+ switch_to_skas(prev, next)));
+}
+
+void interrupt_end(void)
+{
+ if(need_resched()) schedule();
+ if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
+}
+
+void release_thread(struct task_struct *task)
+{
+ CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
+}
+
+void exit_thread(void)
+{
+ CHOOSE_MODE(exit_thread_tt(), exit_thread_skas());
+ unprotect_stack((unsigned long) current_thread);
+}
+
+void *get_current(void)
+{
+ return(current);
+}
+
+void prepare_to_copy(struct task_struct *tsk)
+{
+}
+
+int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
+ unsigned long stack_top, struct task_struct * p,
+ struct pt_regs *regs)
+{
+ p->thread = (struct thread_struct) INIT_THREAD;
+ return(CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
+ clone_flags, sp, stack_top, p, regs));
+}
+
+void initial_thread_cb(void (*proc)(void *), void *arg)
+{
+ int save_kmalloc_ok = kmalloc_ok;
+
+ kmalloc_ok = 0;
+ CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
+ arg);
+ kmalloc_ok = save_kmalloc_ok;
+}
+
+unsigned long stack_sp(unsigned long page)
+{
+ return(page + PAGE_SIZE - sizeof(void *));
+}
+
+int current_pid(void)
+{
+ return(current->pid);
+}
+
+void default_idle(void)
+{
+ uml_idle_timer();
+
+ atomic_inc(&init_mm.mm_count);
+ current->mm = &init_mm;
+ current->active_mm = &init_mm;
+
+ while(1){
+ /* endless idle loop with no priority at all */
+ SET_PRI(current);
+
+ /*
+ * although we are an idle CPU, we do not want to
+ * get into the scheduler unnecessarily.
+ */
+ if(need_resched())
+ schedule();
+
+ idle_sleep(10);
+ }
+}
+
+void cpu_idle(void)
+{
+ CHOOSE_MODE(init_idle_tt(), init_idle_skas());
+}
+
+int page_size(void)
+{
+ return(PAGE_SIZE);
+}
+
+unsigned long page_mask(void)
+{
+ return(PAGE_MASK);
+}
+
+void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
+ pte_t *pte_out)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ if(task->mm == NULL)
+ return(ERR_PTR(-EINVAL));
+ pgd = pgd_offset(task->mm, addr);
+ if(!pgd_present(*pgd))
+ return(ERR_PTR(-EINVAL));
+
+ pud = pud_offset(pgd, addr);
+ if(!pud_present(*pud))
+ return(ERR_PTR(-EINVAL));
+
+ pmd = pmd_offset(pud, addr);
+ if(!pmd_present(*pmd))
+ return(ERR_PTR(-EINVAL));
+
+ pte = pte_offset_kernel(pmd, addr);
+ if(!pte_present(*pte))
+ return(ERR_PTR(-EINVAL));
+
+ if(pte_out != NULL)
+ *pte_out = *pte;
+ return((void *) (pte_val(*pte) & PAGE_MASK) + (addr & ~PAGE_MASK));
+}
+
+char *current_cmd(void)
+{
+#if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
+ return("(Unknown)");
+#else
+ void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
+ return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
+#endif
+}
+
+void force_sigbus(void)
+{
+ printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
+ current->pid);
+ lock_kernel();
+ sigaddset(¤t->pending.signal, SIGBUS);
+ recalc_sigpending();
+ current->flags |= PF_SIGNALED;
+ do_exit(SIGBUS | 0x80);
+}
+
+void dump_thread(struct pt_regs *regs, struct user *u)
+{
+}
+
+void enable_hlt(void)
+{
+ panic("enable_hlt");
+}
+
+EXPORT_SYMBOL(enable_hlt);
+
+void disable_hlt(void)
+{
+ panic("disable_hlt");
+}
+
+EXPORT_SYMBOL(disable_hlt);
+
+void *um_kmalloc(int size)
+{
+ return(kmalloc(size, GFP_KERNEL));
+}
+
+void *um_kmalloc_atomic(int size)
+{
+ return(kmalloc(size, GFP_ATOMIC));
+}
+
+void *um_vmalloc(int size)
+{
+ return(vmalloc(size));
+}
+
+unsigned long get_fault_addr(void)
+{
+ return((unsigned long) current->thread.fault_addr);
+}
+
+EXPORT_SYMBOL(get_fault_addr);
+
+void not_implemented(void)
+{
+ printk(KERN_DEBUG "Something isn't implemented in here\n");
+}
+
+EXPORT_SYMBOL(not_implemented);
+
+int user_context(unsigned long sp)
+{
+ unsigned long stack;
+
+ stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
+ return(stack != (unsigned long) current_thread);
+}
+
+extern void remove_umid_dir(void);
+
+__uml_exitcall(remove_umid_dir);
+
+extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
+
+void do_uml_exitcalls(void)
+{
+ exitcall_t *call;
+
+ call = &__uml_exitcall_end;
+ while (--call >= &__uml_exitcall_begin)
+ (*call)();
+}
+
+char *uml_strdup(char *string)
+{
+ char *new;
+
+ new = kmalloc(strlen(string) + 1, GFP_KERNEL);
+ if(new == NULL) return(NULL);
+ strcpy(new, string);
+ return(new);
+}
+
+void *get_init_task(void)
+{
+ return(&init_thread_union.thread_info.task);
+}
+
+int copy_to_user_proc(void __user *to, void *from, int size)
+{
+ return(copy_to_user(to, from, size));
+}
+
+int copy_from_user_proc(void *to, void __user *from, int size)
+{
+ return(copy_from_user(to, from, size));
+}
+
+int clear_user_proc(void __user *buf, int size)
+{
+ return(clear_user(buf, size));
+}
+
+int strlen_user_proc(char __user *str)
+{
+ return(strlen_user(str));
+}
+
+int smp_sigio_handler(void)
+{
+#ifdef CONFIG_SMP
+ int cpu = current_thread->cpu;
+ IPI_handler(cpu);
+ if(cpu != 0)
+ return(1);
+#endif
+ return(0);
+}
+
+int um_in_interrupt(void)
+{
+ return(in_interrupt());
+}
+
+int cpu(void)
+{
+ return(current_thread->cpu);
+}
+
+static atomic_t using_sysemu = ATOMIC_INIT(0);
+int sysemu_supported;
+
+void set_using_sysemu(int value)
+{
+ if (value > sysemu_supported)
+ return;
+ atomic_set(&using_sysemu, value);
+}
+
+int get_using_sysemu(void)
+{
+ return atomic_read(&using_sysemu);
+}
+
+static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
+{
+ if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
+ *eof = 1;
+
+ return strlen(buf);
+}
+
+static int proc_write_sysemu(struct file *file,const char *buf, unsigned long count,void *data)
+{
+ char tmp[2];
+
+ if (copy_from_user(tmp, buf, 1))
+ return -EFAULT;
+
+ if (tmp[0] >= '0' && tmp[0] <= '2')
+ set_using_sysemu(tmp[0] - '0');
+ return count; /*We use the first char, but pretend to write everything*/
+}
+
+int __init make_proc_sysemu(void)
+{
+ struct proc_dir_entry *ent;
+ if (!sysemu_supported)
+ return 0;
+
+ ent = create_proc_entry("sysemu", 0600, &proc_root);
+
+ if (ent == NULL)
+ {
+ printk("Failed to register /proc/sysemu\n");
+ return(0);
+ }
+
+ ent->read_proc = proc_read_sysemu;
+ ent->write_proc = proc_write_sysemu;
+
+ return 0;
+}
+
+late_initcall(make_proc_sysemu);
+
+int singlestepping(void * t)
+{
+ struct task_struct *task = t ? t : current;
+
+ if ( ! (task->ptrace & PT_DTRACE) )
+ return(0);
+
+ if (task->thread.singlestep_syscall)
+ return(1);
+
+ return 2;
+}
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+ if (randomize_va_space)
+ sp -= get_random_int() % 8192;
+ return sp & ~0xf;
+}
+
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
new file mode 100644
index 0000000..3a99ee6
--- /dev/null
+++ b/arch/um/kernel/ptrace.c
@@ -0,0 +1,388 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/mm.h"
+#include "linux/errno.h"
+#include "linux/smp_lock.h"
+#include "linux/security.h"
+#include "linux/ptrace.h"
+#include "linux/audit.h"
+#ifdef CONFIG_PROC_MM
+#include "linux/proc_mm.h"
+#endif
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+#include "kern_util.h"
+#include "skas_ptrace.h"
+#include "sysdep/ptrace.h"
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ */
+void ptrace_disable(struct task_struct *child)
+{
+ child->ptrace &= ~PT_DTRACE;
+ child->thread.singlestep_syscall = 0;
+}
+
+long sys_ptrace(long request, long pid, long addr, long data)
+{
+ struct task_struct *child;
+ int i, ret;
+
+ lock_kernel();
+ ret = -EPERM;
+ if (request == PTRACE_TRACEME) {
+ /* are we already being traced? */
+ if (current->ptrace & PT_PTRACED)
+ goto out;
+
+ ret = security_ptrace(current->parent, current);
+ if (ret)
+ goto out;
+
+ /* set the ptrace bit in the process flags. */
+ current->ptrace |= PT_PTRACED;
+ ret = 0;
+ goto out;
+ }
+ ret = -ESRCH;
+ read_lock(&tasklist_lock);
+ child = find_task_by_pid(pid);
+ if (child)
+ get_task_struct(child);
+ read_unlock(&tasklist_lock);
+ if (!child)
+ goto out;
+
+ ret = -EPERM;
+ if (pid == 1) /* you may not mess with init */
+ goto out_tsk;
+
+ if (request == PTRACE_ATTACH) {
+ ret = ptrace_attach(child);
+ goto out_tsk;
+ }
+
+ ret = ptrace_check_attach(child, request == PTRACE_KILL);
+ if (ret < 0)
+ goto out_tsk;
+
+ switch (request) {
+ /* when I and D space are separate, these will need to be fixed. */
+ case PTRACE_PEEKTEXT: /* read word at location addr. */
+ case PTRACE_PEEKDATA: {
+ unsigned long tmp;
+ int copied;
+
+ ret = -EIO;
+ copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+ if (copied != sizeof(tmp))
+ break;
+ ret = put_user(tmp, (unsigned long __user *) data);
+ break;
+ }
+
+ /* read the word at location addr in the USER area. */
+ case PTRACE_PEEKUSR: {
+ unsigned long tmp;
+
+ ret = -EIO;
+ if ((addr & 3) || addr < 0)
+ break;
+
+ tmp = 0; /* Default return condition */
+ if(addr < MAX_REG_OFFSET){
+ tmp = getreg(child, addr);
+ }
+ else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+ (addr <= offsetof(struct user, u_debugreg[7]))){
+ addr -= offsetof(struct user, u_debugreg[0]);
+ addr = addr >> 2;
+ tmp = child->thread.arch.debugregs[addr];
+ }
+ ret = put_user(tmp, (unsigned long __user *) data);
+ break;
+ }
+
+ /* when I and D space are separate, this will have to be fixed. */
+ case PTRACE_POKETEXT: /* write the word at location addr. */
+ case PTRACE_POKEDATA:
+ ret = -EIO;
+ if (access_process_vm(child, addr, &data, sizeof(data),
+ 1) != sizeof(data))
+ break;
+ ret = 0;
+ break;
+
+ case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
+ ret = -EIO;
+ if ((addr & 3) || addr < 0)
+ break;
+
+ if (addr < MAX_REG_OFFSET) {
+ ret = putreg(child, addr, data);
+ break;
+ }
+#if 0 /* XXX x86_64 */
+ else if((addr >= offsetof(struct user, u_debugreg[0])) &&
+ (addr <= offsetof(struct user, u_debugreg[7]))){
+ addr -= offsetof(struct user, u_debugreg[0]);
+ addr = addr >> 2;
+ if((addr == 4) || (addr == 5)) break;
+ child->thread.arch.debugregs[addr] = data;
+ ret = 0;
+ }
+#endif
+
+ break;
+
+ case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
+ case PTRACE_CONT: { /* restart after signal. */
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+
+ child->ptrace &= ~PT_DTRACE;
+ child->thread.singlestep_syscall = 0;
+ if (request == PTRACE_SYSCALL) {
+ set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ }
+ else {
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ }
+ child->exit_code = data;
+ wake_up_process(child);
+ ret = 0;
+ break;
+ }
+
+/*
+ * make the child exit. Best I can do is send it a sigkill.
+ * perhaps it should be put in the status that it wants to
+ * exit.
+ */
+ case PTRACE_KILL: {
+ ret = 0;
+ if (child->exit_state == EXIT_ZOMBIE) /* already dead */
+ break;
+
+ child->ptrace &= ~PT_DTRACE;
+ child->thread.singlestep_syscall = 0;
+ child->exit_code = SIGKILL;
+ wake_up_process(child);
+ break;
+ }
+
+ case PTRACE_SINGLESTEP: { /* set the trap flag. */
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ child->ptrace |= PT_DTRACE;
+ child->thread.singlestep_syscall = 0;
+ child->exit_code = data;
+ /* give it a chance to run. */
+ wake_up_process(child);
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_DETACH:
+ /* detach a process that was attached. */
+ ret = ptrace_detach(child, data);
+ break;
+
+#ifdef PTRACE_GETREGS
+ case PTRACE_GETREGS: { /* Get all gp regs from the child. */
+ if (!access_ok(VERIFY_WRITE, (unsigned long *)data,
+ MAX_REG_OFFSET)) {
+ ret = -EIO;
+ break;
+ }
+ for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
+ __put_user(getreg(child, i),
+ (unsigned long __user *) data);
+ data += sizeof(long);
+ }
+ ret = 0;
+ break;
+ }
+#endif
+#ifdef PTRACE_SETREGS
+ case PTRACE_SETREGS: { /* Set all gp regs in the child. */
+ unsigned long tmp = 0;
+ if (!access_ok(VERIFY_READ, (unsigned *)data,
+ MAX_REG_OFFSET)) {
+ ret = -EIO;
+ break;
+ }
+ for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
+ __get_user(tmp, (unsigned long __user *) data);
+ putreg(child, i, tmp);
+ data += sizeof(long);
+ }
+ ret = 0;
+ break;
+ }
+#endif
+#ifdef PTRACE_GETFPREGS
+ case PTRACE_GETFPREGS: /* Get the child FPU state. */
+ ret = get_fpregs(data, child);
+ break;
+#endif
+#ifdef PTRACE_SETFPREGS
+ case PTRACE_SETFPREGS: /* Set the child FPU state. */
+ ret = set_fpregs(data, child);
+ break;
+#endif
+#ifdef PTRACE_GETFPXREGS
+ case PTRACE_GETFPXREGS: /* Get the child FPU state. */
+ ret = get_fpxregs(data, child);
+ break;
+#endif
+#ifdef PTRACE_SETFPXREGS
+ case PTRACE_SETFPXREGS: /* Set the child FPU state. */
+ ret = set_fpxregs(data, child);
+ break;
+#endif
+ case PTRACE_FAULTINFO: {
+ struct ptrace_faultinfo fault;
+
+ fault = ((struct ptrace_faultinfo)
+ { .is_write = child->thread.err,
+ .addr = child->thread.cr2 });
+ ret = copy_to_user((unsigned long __user *) data, &fault,
+ sizeof(fault));
+ if(ret)
+ break;
+ break;
+ }
+ case PTRACE_SIGPENDING:
+ ret = copy_to_user((unsigned long __user *) data,
+ &child->pending.signal,
+ sizeof(child->pending.signal));
+ break;
+
+ case PTRACE_LDT: {
+ struct ptrace_ldt ldt;
+
+ if(copy_from_user(&ldt, (unsigned long __user *) data,
+ sizeof(ldt))){
+ ret = -EIO;
+ break;
+ }
+
+ /* This one is confusing, so just punt and return -EIO for
+ * now
+ */
+ ret = -EIO;
+ break;
+ }
+#ifdef CONFIG_PROC_MM
+ case PTRACE_SWITCH_MM: {
+ struct mm_struct *old = child->mm;
+ struct mm_struct *new = proc_mm_get_mm(data);
+
+ if(IS_ERR(new)){
+ ret = PTR_ERR(new);
+ break;
+ }
+
+ atomic_inc(&new->mm_users);
+ child->mm = new;
+ child->active_mm = new;
+ mmput(old);
+ ret = 0;
+ break;
+ }
+#endif
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+ out_tsk:
+ put_task_struct(child);
+ out:
+ unlock_kernel();
+ return ret;
+}
+
+void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
+ int error_code)
+{
+ struct siginfo info;
+
+ memset(&info, 0, sizeof(info));
+ info.si_signo = SIGTRAP;
+ info.si_code = TRAP_BRKPT;
+
+ /* User-mode eip? */
+ info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
+
+ /* Send us the fakey SIGTRAP */
+ force_sig_info(SIGTRAP, &info, tsk);
+}
+
+/* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
+ * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
+ */
+void syscall_trace(union uml_pt_regs *regs, int entryexit)
+{
+ int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
+ int tracesysgood;
+
+ if (unlikely(current->audit_context)) {
+ if (!entryexit)
+ audit_syscall_entry(current,
+ UPT_SYSCALL_NR(®s->regs),
+ UPT_SYSCALL_ARG1(®s->regs),
+ UPT_SYSCALL_ARG2(®s->regs),
+ UPT_SYSCALL_ARG3(®s->regs),
+ UPT_SYSCALL_ARG4(®s->regs));
+ else
+ audit_syscall_exit(current,
+ UPT_SYSCALL_RET(®s->regs));
+ }
+
+ /* Fake a debug trap */
+ if (is_singlestep)
+ send_sigtrap(current, regs, 0);
+
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+
+ if (!(current->ptrace & PT_PTRACED))
+ return;
+
+ /* the 0x80 provides a way for the tracing parent to distinguish
+ between a syscall stop and SIGTRAP delivery */
+ tracesysgood = (current->ptrace & PT_TRACESYSGOOD);
+ ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0));
+
+ if (entryexit) /* force do_signal() --> is_syscall() */
+ set_thread_flag(TIF_SIGPENDING);
+
+ /* this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c
new file mode 100644
index 0000000..207f89d
--- /dev/null
+++ b/arch/um/kernel/reboot.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/module.h"
+#include "linux/sched.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "os.h"
+#include "mode.h"
+#include "choose-mode.h"
+
+#ifdef CONFIG_SMP
+static void kill_idlers(int me)
+{
+#ifdef CONFIG_MODE_TT
+ struct task_struct *p;
+ int i;
+
+ for(i = 0; i < sizeof(idle_threads)/sizeof(idle_threads[0]); i++){
+ p = idle_threads[i];
+ if((p != NULL) && (p->thread.mode.tt.extern_pid != me))
+ os_kill_process(p->thread.mode.tt.extern_pid, 0);
+ }
+#endif
+}
+#endif
+
+static void kill_off_processes(void)
+{
+ CHOOSE_MODE(kill_off_processes_tt(), kill_off_processes_skas());
+#ifdef CONFIG_SMP
+ kill_idlers(os_getpid());
+#endif
+}
+
+void uml_cleanup(void)
+{
+ kill_off_processes();
+ do_uml_exitcalls();
+}
+
+void machine_restart(char * __unused)
+{
+ do_uml_exitcalls();
+ kill_off_processes();
+ CHOOSE_MODE(reboot_tt(), reboot_skas());
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void machine_power_off(void)
+{
+ do_uml_exitcalls();
+ kill_off_processes();
+ CHOOSE_MODE(halt_tt(), halt_skas());
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+void machine_halt(void)
+{
+ machine_power_off();
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/resource.c b/arch/um/kernel/resource.c
new file mode 100644
index 0000000..32188e1
--- /dev/null
+++ b/arch/um/kernel/resource.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/pci.h"
+
+unsigned long resource_fixup(struct pci_dev * dev, struct resource * res,
+ unsigned long start, unsigned long size)
+{
+ return start;
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/sigio_kern.c b/arch/um/kernel/sigio_kern.c
new file mode 100644
index 0000000..2299884
--- /dev/null
+++ b/arch/um/kernel/sigio_kern.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/list.h"
+#include "linux/slab.h"
+#include "linux/signal.h"
+#include "linux/interrupt.h"
+#include "init.h"
+#include "sigio.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+
+/* Protected by sigio_lock() called from write_sigio_workaround */
+static int sigio_irq_fd = -1;
+
+static irqreturn_t sigio_interrupt(int irq, void *data, struct pt_regs *unused)
+{
+ read_sigio_fd(sigio_irq_fd);
+ reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
+ return(IRQ_HANDLED);
+}
+
+int write_sigio_irq(int fd)
+{
+ int err;
+
+ err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt,
+ SA_INTERRUPT | SA_SAMPLE_RANDOM, "write sigio",
+ NULL);
+ if(err){
+ printk("write_sigio_irq : um_request_irq failed, err = %d\n",
+ err);
+ return(-1);
+ }
+ sigio_irq_fd = fd;
+ return(0);
+}
+
+static DEFINE_SPINLOCK(sigio_spinlock);
+
+void sigio_lock(void)
+{
+ spin_lock(&sigio_spinlock);
+}
+
+void sigio_unlock(void)
+{
+ spin_unlock(&sigio_spinlock);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/sigio_user.c b/arch/um/kernel/sigio_user.c
new file mode 100644
index 0000000..668df13
--- /dev/null
+++ b/arch/um/kernel/sigio_user.c
@@ -0,0 +1,431 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <pty.h>
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include <sched.h>
+#include <sys/socket.h>
+#include <sys/poll.h>
+#include "init.h"
+#include "user.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "sigio.h"
+#include "helper.h"
+#include "os.h"
+
+/* Changed during early boot */
+int pty_output_sigio = 0;
+int pty_close_sigio = 0;
+
+/* Used as a flag during SIGIO testing early in boot */
+static volatile int got_sigio = 0;
+
+void __init handler(int sig)
+{
+ got_sigio = 1;
+}
+
+struct openpty_arg {
+ int master;
+ int slave;
+ int err;
+};
+
+static void openpty_cb(void *arg)
+{
+ struct openpty_arg *info = arg;
+
+ info->err = 0;
+ if(openpty(&info->master, &info->slave, NULL, NULL, NULL))
+ info->err = -errno;
+}
+
+void __init check_one_sigio(void (*proc)(int, int))
+{
+ struct sigaction old, new;
+ struct openpty_arg pty = { .master = -1, .slave = -1 };
+ int master, slave, err;
+
+ initial_thread_cb(openpty_cb, &pty);
+ if(pty.err){
+ printk("openpty failed, errno = %d\n", -pty.err);
+ return;
+ }
+
+ master = pty.master;
+ slave = pty.slave;
+
+ if((master == -1) || (slave == -1)){
+ printk("openpty failed to allocate a pty\n");
+ return;
+ }
+
+ /* Not now, but complain so we now where we failed. */
+ err = raw(master);
+ if (err < 0)
+ panic("check_sigio : __raw failed, errno = %d\n", -err);
+
+ err = os_sigio_async(master, slave);
+ if(err < 0)
+ panic("tty_fds : sigio_async failed, err = %d\n", -err);
+
+ if(sigaction(SIGIO, NULL, &old) < 0)
+ panic("check_sigio : sigaction 1 failed, errno = %d\n", errno);
+ new = old;
+ new.sa_handler = handler;
+ if(sigaction(SIGIO, &new, NULL) < 0)
+ panic("check_sigio : sigaction 2 failed, errno = %d\n", errno);
+
+ got_sigio = 0;
+ (*proc)(master, slave);
+
+ os_close_file(master);
+ os_close_file(slave);
+
+ if(sigaction(SIGIO, &old, NULL) < 0)
+ panic("check_sigio : sigaction 3 failed, errno = %d\n", errno);
+}
+
+static void tty_output(int master, int slave)
+{
+ int n;
+ char buf[512];
+
+ printk("Checking that host ptys support output SIGIO...");
+
+ memset(buf, 0, sizeof(buf));
+
+ while(os_write_file(master, buf, sizeof(buf)) > 0) ;
+ if(errno != EAGAIN)
+ panic("check_sigio : write failed, errno = %d\n", errno);
+ while(((n = os_read_file(slave, buf, sizeof(buf))) > 0) && !got_sigio) ;
+
+ if (got_sigio) {
+ printk("Yes\n");
+ pty_output_sigio = 1;
+ } else if (n == -EAGAIN) {
+ printk("No, enabling workaround\n");
+ } else {
+ panic("check_sigio : read failed, err = %d\n", n);
+ }
+}
+
+static void tty_close(int master, int slave)
+{
+ printk("Checking that host ptys support SIGIO on close...");
+
+ os_close_file(slave);
+ if(got_sigio){
+ printk("Yes\n");
+ pty_close_sigio = 1;
+ }
+ else printk("No, enabling workaround\n");
+}
+
+void __init check_sigio(void)
+{
+ if((os_access("/dev/ptmx", OS_ACC_R_OK) < 0) &&
+ (os_access("/dev/ptyp0", OS_ACC_R_OK) < 0)){
+ printk("No pseudo-terminals available - skipping pty SIGIO "
+ "check\n");
+ return;
+ }
+ check_one_sigio(tty_output);
+ check_one_sigio(tty_close);
+}
+
+/* Protected by sigio_lock(), also used by sigio_cleanup, which is an
+ * exitcall.
+ */
+static int write_sigio_pid = -1;
+
+/* These arrays are initialized before the sigio thread is started, and
+ * the descriptors closed after it is killed. So, it can't see them change.
+ * On the UML side, they are changed under the sigio_lock.
+ */
+static int write_sigio_fds[2] = { -1, -1 };
+static int sigio_private[2] = { -1, -1 };
+
+struct pollfds {
+ struct pollfd *poll;
+ int size;
+ int used;
+};
+
+/* Protected by sigio_lock(). Used by the sigio thread, but the UML thread
+ * synchronizes with it.
+ */
+struct pollfds current_poll = {
+ .poll = NULL,
+ .size = 0,
+ .used = 0
+};
+
+struct pollfds next_poll = {
+ .poll = NULL,
+ .size = 0,
+ .used = 0
+};
+
+static int write_sigio_thread(void *unused)
+{
+ struct pollfds *fds, tmp;
+ struct pollfd *p;
+ int i, n, respond_fd;
+ char c;
+
+ fds = ¤t_poll;
+ while(1){
+ n = poll(fds->poll, fds->used, -1);
+ if(n < 0){
+ if(errno == EINTR) continue;
+ printk("write_sigio_thread : poll returned %d, "
+ "errno = %d\n", n, errno);
+ }
+ for(i = 0; i < fds->used; i++){
+ p = &fds->poll[i];
+ if(p->revents == 0) continue;
+ if(p->fd == sigio_private[1]){
+ n = os_read_file(sigio_private[1], &c, sizeof(c));
+ if(n != sizeof(c))
+ printk("write_sigio_thread : "
+ "read failed, err = %d\n", -n);
+ tmp = current_poll;
+ current_poll = next_poll;
+ next_poll = tmp;
+ respond_fd = sigio_private[1];
+ }
+ else {
+ respond_fd = write_sigio_fds[1];
+ fds->used--;
+ memmove(&fds->poll[i], &fds->poll[i + 1],
+ (fds->used - i) * sizeof(*fds->poll));
+ }
+
+ n = os_write_file(respond_fd, &c, sizeof(c));
+ if(n != sizeof(c))
+ printk("write_sigio_thread : write failed, "
+ "err = %d\n", -n);
+ }
+ }
+}
+
+static int need_poll(int n)
+{
+ if(n <= next_poll.size){
+ next_poll.used = n;
+ return(0);
+ }
+ if(next_poll.poll != NULL) kfree(next_poll.poll);
+ next_poll.poll = um_kmalloc_atomic(n * sizeof(struct pollfd));
+ if(next_poll.poll == NULL){
+ printk("need_poll : failed to allocate new pollfds\n");
+ next_poll.size = 0;
+ next_poll.used = 0;
+ return(-1);
+ }
+ next_poll.size = n;
+ next_poll.used = n;
+ return(0);
+}
+
+/* Must be called with sigio_lock held, because it's needed by the marked
+ * critical section. */
+static void update_thread(void)
+{
+ unsigned long flags;
+ int n;
+ char c;
+
+ flags = set_signals(0);
+ n = os_write_file(sigio_private[0], &c, sizeof(c));
+ if(n != sizeof(c)){
+ printk("update_thread : write failed, err = %d\n", -n);
+ goto fail;
+ }
+
+ n = os_read_file(sigio_private[0], &c, sizeof(c));
+ if(n != sizeof(c)){
+ printk("update_thread : read failed, err = %d\n", -n);
+ goto fail;
+ }
+
+ set_signals(flags);
+ return;
+ fail:
+ /* Critical section start */
+ if(write_sigio_pid != -1)
+ os_kill_process(write_sigio_pid, 1);
+ write_sigio_pid = -1;
+ os_close_file(sigio_private[0]);
+ os_close_file(sigio_private[1]);
+ os_close_file(write_sigio_fds[0]);
+ os_close_file(write_sigio_fds[1]);
+ /* Critical section end */
+ set_signals(flags);
+}
+
+int add_sigio_fd(int fd, int read)
+{
+ int err = 0, i, n, events;
+
+ sigio_lock();
+ for(i = 0; i < current_poll.used; i++){
+ if(current_poll.poll[i].fd == fd)
+ goto out;
+ }
+
+ n = current_poll.used + 1;
+ err = need_poll(n);
+ if(err)
+ goto out;
+
+ for(i = 0; i < current_poll.used; i++)
+ next_poll.poll[i] = current_poll.poll[i];
+
+ if(read) events = POLLIN;
+ else events = POLLOUT;
+
+ next_poll.poll[n - 1] = ((struct pollfd) { .fd = fd,
+ .events = events,
+ .revents = 0 });
+ update_thread();
+ out:
+ sigio_unlock();
+ return(err);
+}
+
+int ignore_sigio_fd(int fd)
+{
+ struct pollfd *p;
+ int err = 0, i, n = 0;
+
+ sigio_lock();
+ for(i = 0; i < current_poll.used; i++){
+ if(current_poll.poll[i].fd == fd) break;
+ }
+ if(i == current_poll.used)
+ goto out;
+
+ err = need_poll(current_poll.used - 1);
+ if(err)
+ goto out;
+
+ for(i = 0; i < current_poll.used; i++){
+ p = ¤t_poll.poll[i];
+ if(p->fd != fd) next_poll.poll[n++] = current_poll.poll[i];
+ }
+ if(n == i){
+ printk("ignore_sigio_fd : fd %d not found\n", fd);
+ err = -1;
+ goto out;
+ }
+
+ update_thread();
+ out:
+ sigio_unlock();
+ return(err);
+}
+
+static int setup_initial_poll(int fd)
+{
+ struct pollfd *p;
+
+ p = um_kmalloc(sizeof(struct pollfd));
+ if(p == NULL){
+ printk("setup_initial_poll : failed to allocate poll\n");
+ return(-1);
+ }
+ *p = ((struct pollfd) { .fd = fd,
+ .events = POLLIN,
+ .revents = 0 });
+ current_poll = ((struct pollfds) { .poll = p,
+ .used = 1,
+ .size = 1 });
+ return(0);
+}
+
+void write_sigio_workaround(void)
+{
+ unsigned long stack;
+ int err;
+
+ sigio_lock();
+ if(write_sigio_pid != -1)
+ goto out;
+
+ err = os_pipe(write_sigio_fds, 1, 1);
+ if(err < 0){
+ printk("write_sigio_workaround - os_pipe 1 failed, "
+ "err = %d\n", -err);
+ goto out;
+ }
+ err = os_pipe(sigio_private, 1, 1);
+ if(err < 0){
+ printk("write_sigio_workaround - os_pipe 2 failed, "
+ "err = %d\n", -err);
+ goto out_close1;
+ }
+ if(setup_initial_poll(sigio_private[1]))
+ goto out_close2;
+
+ write_sigio_pid = run_helper_thread(write_sigio_thread, NULL,
+ CLONE_FILES | CLONE_VM, &stack, 0);
+
+ if(write_sigio_pid < 0) goto out_close2;
+
+ if(write_sigio_irq(write_sigio_fds[0]))
+ goto out_kill;
+
+ out:
+ sigio_unlock();
+ return;
+
+ out_kill:
+ os_kill_process(write_sigio_pid, 1);
+ write_sigio_pid = -1;
+ out_close2:
+ os_close_file(sigio_private[0]);
+ os_close_file(sigio_private[1]);
+ out_close1:
+ os_close_file(write_sigio_fds[0]);
+ os_close_file(write_sigio_fds[1]);
+ sigio_unlock();
+}
+
+int read_sigio_fd(int fd)
+{
+ int n;
+ char c;
+
+ n = os_read_file(fd, &c, sizeof(c));
+ if(n != sizeof(c)){
+ if(n < 0) {
+ printk("read_sigio_fd - read failed, err = %d\n", -n);
+ return(n);
+ }
+ else {
+ printk("read_sigio_fd - short read, bytes = %d\n", n);
+ return(-EIO);
+ }
+ }
+ return(n);
+}
+
+static void sigio_cleanup(void)
+{
+ if (write_sigio_pid != -1) {
+ os_kill_process(write_sigio_pid, 1);
+ write_sigio_pid = -1;
+ }
+}
+
+__uml_exitcall(sigio_cleanup);
diff --git a/arch/um/kernel/signal_kern.c b/arch/um/kernel/signal_kern.c
new file mode 100644
index 0000000..7807a3e
--- /dev/null
+++ b/arch/um/kernel/signal_kern.c
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/stddef.h"
+#include "linux/sys.h"
+#include "linux/sched.h"
+#include "linux/wait.h"
+#include "linux/kernel.h"
+#include "linux/smp_lock.h"
+#include "linux/module.h"
+#include "linux/slab.h"
+#include "linux/tty.h"
+#include "linux/binfmts.h"
+#include "linux/ptrace.h"
+#include "asm/signal.h"
+#include "asm/uaccess.h"
+#include "asm/unistd.h"
+#include "user_util.h"
+#include "asm/ucontext.h"
+#include "kern_util.h"
+#include "signal_kern.h"
+#include "signal_user.h"
+#include "kern.h"
+#include "frame_kern.h"
+#include "sigcontext.h"
+#include "mode.h"
+
+EXPORT_SYMBOL(block_signals);
+EXPORT_SYMBOL(unblock_signals);
+
+#define _S(nr) (1<<((nr)-1))
+
+#define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
+
+/*
+ * OK, we're invoking a handler
+ */
+static int handle_signal(struct pt_regs *regs, unsigned long signr,
+ struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *oldset)
+{
+ unsigned long sp;
+ int err;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+ /* Did we come from a system call? */
+ if(PT_REGS_SYSCALL_NR(regs) >= 0){
+ /* If so, check system call restarting.. */
+ switch(PT_REGS_SYSCALL_RET(regs)){
+ case -ERESTART_RESTARTBLOCK:
+ case -ERESTARTNOHAND:
+ PT_REGS_SYSCALL_RET(regs) = -EINTR;
+ break;
+
+ case -ERESTARTSYS:
+ if (!(ka->sa.sa_flags & SA_RESTART)) {
+ PT_REGS_SYSCALL_RET(regs) = -EINTR;
+ break;
+ }
+ /* fallthrough */
+ case -ERESTARTNOINTR:
+ PT_REGS_RESTART_SYSCALL(regs);
+ PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
+ break;
+ }
+ }
+
+ sp = PT_REGS_SP(regs);
+ if((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
+ sp = current->sas_ss_sp + current->sas_ss_size;
+
+#ifdef CONFIG_ARCH_HAS_SC_SIGNALS
+ if(!(ka->sa.sa_flags & SA_SIGINFO))
+ err = setup_signal_stack_sc(sp, signr, ka, regs, oldset);
+ else
+#endif
+ err = setup_signal_stack_si(sp, signr, ka, regs, info, oldset);
+
+ if(err){
+ spin_lock_irq(¤t->sighand->siglock);
+ current->blocked = *oldset;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+ force_sigsegv(signr, current);
+ }
+ else if(!(ka->sa.sa_flags & SA_NODEFER)){
+ spin_lock_irq(¤t->sighand->siglock);
+ sigorsets(¤t->blocked, ¤t->blocked,
+ &ka->sa.sa_mask);
+ sigaddset(¤t->blocked, signr);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+ }
+
+ return err;
+}
+
+static int kern_do_signal(struct pt_regs *regs, sigset_t *oldset)
+{
+ struct k_sigaction ka_copy;
+ siginfo_t info;
+ int sig, handled_sig = 0;
+
+ while((sig = get_signal_to_deliver(&info, &ka_copy, regs, NULL)) > 0){
+ handled_sig = 1;
+ /* Whee! Actually deliver the signal. */
+ if(!handle_signal(regs, sig, &ka_copy, &info, oldset))
+ break;
+ }
+
+ /* Did we come from a system call? */
+ if(!handled_sig && (PT_REGS_SYSCALL_NR(regs) >= 0)){
+ /* Restart the system call - no handlers present */
+ if(PT_REGS_SYSCALL_RET(regs) == -ERESTARTNOHAND ||
+ PT_REGS_SYSCALL_RET(regs) == -ERESTARTSYS ||
+ PT_REGS_SYSCALL_RET(regs) == -ERESTARTNOINTR){
+ PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
+ PT_REGS_RESTART_SYSCALL(regs);
+ }
+ else if(PT_REGS_SYSCALL_RET(regs) == -ERESTART_RESTARTBLOCK){
+ PT_REGS_SYSCALL_RET(regs) = __NR_restart_syscall;
+ PT_REGS_RESTART_SYSCALL(regs);
+ }
+ }
+
+ /* This closes a way to execute a system call on the host. If
+ * you set a breakpoint on a system call instruction and singlestep
+ * from it, the tracing thread used to PTRACE_SINGLESTEP the process
+ * rather than PTRACE_SYSCALL it, allowing the system call to execute
+ * on the host. The tracing thread will check this flag and
+ * PTRACE_SYSCALL if necessary.
+ */
+ if(current->ptrace & PT_DTRACE)
+ current->thread.singlestep_syscall =
+ is_syscall(PT_REGS_IP(¤t->thread.regs));
+ return(handled_sig);
+}
+
+int do_signal(void)
+{
+ return(kern_do_signal(¤t->thread.regs, ¤t->blocked));
+}
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
+{
+ sigset_t saveset;
+
+ mask &= _BLOCKABLE;
+ spin_lock_irq(¤t->sighand->siglock);
+ saveset = current->blocked;
+ siginitset(¤t->blocked, mask);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ PT_REGS_SYSCALL_RET(¤t->thread.regs) = -EINTR;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ if(kern_do_signal(¤t->thread.regs, &saveset))
+ return(-EINTR);
+ }
+}
+
+long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
+{
+ sigset_t saveset, newset;
+
+ /* XXX: Don't preclude handling different sized sigset_t's. */
+ if (sigsetsize != sizeof(sigset_t))
+ return -EINVAL;
+
+ if (copy_from_user(&newset, unewset, sizeof(newset)))
+ return -EFAULT;
+ sigdelsetmask(&newset, ~_BLOCKABLE);
+
+ spin_lock_irq(¤t->sighand->siglock);
+ saveset = current->blocked;
+ current->blocked = newset;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ PT_REGS_SYSCALL_RET(¤t->thread.regs) = -EINTR;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ if (kern_do_signal(¤t->thread.regs, &saveset))
+ return(-EINTR);
+ }
+}
+
+long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
+{
+ return(do_sigaltstack(uss, uoss, PT_REGS_SP(¤t->thread.regs)));
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/signal_user.c b/arch/um/kernel/signal_user.c
new file mode 100644
index 0000000..62f4578
--- /dev/null
+++ b/arch/um/kernel/signal_user.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/mman.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "signal_user.h"
+#include "signal_kern.h"
+#include "sysdep/sigcontext.h"
+#include "sigcontext.h"
+
+void set_sigstack(void *sig_stack, int size)
+{
+ stack_t stack = ((stack_t) { .ss_flags = 0,
+ .ss_sp = (__ptr_t) sig_stack,
+ .ss_size = size - sizeof(void *) });
+
+ if(sigaltstack(&stack, NULL) != 0)
+ panic("enabling signal stack failed, errno = %d\n", errno);
+}
+
+void set_handler(int sig, void (*handler)(int), int flags, ...)
+{
+ struct sigaction action;
+ va_list ap;
+ int mask;
+
+ va_start(ap, flags);
+ action.sa_handler = handler;
+ sigemptyset(&action.sa_mask);
+ while((mask = va_arg(ap, int)) != -1){
+ sigaddset(&action.sa_mask, mask);
+ }
+ va_end(ap);
+ action.sa_flags = flags;
+ action.sa_restorer = NULL;
+ if(sigaction(sig, &action, NULL) < 0)
+ panic("sigaction failed");
+}
+
+int change_sig(int signal, int on)
+{
+ sigset_t sigset, old;
+
+ sigemptyset(&sigset);
+ sigaddset(&sigset, signal);
+ sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old);
+ return(!sigismember(&old, signal));
+}
+
+/* Both here and in set/get_signal we don't touch SIGPROF, because we must not
+ * disable profiling; it's safe because the profiling code does not interact
+ * with the kernel code at all.*/
+
+static void change_signals(int type)
+{
+ sigset_t mask;
+
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGVTALRM);
+ sigaddset(&mask, SIGALRM);
+ sigaddset(&mask, SIGIO);
+ if(sigprocmask(type, &mask, NULL) < 0)
+ panic("Failed to change signal mask - errno = %d", errno);
+}
+
+void block_signals(void)
+{
+ change_signals(SIG_BLOCK);
+}
+
+void unblock_signals(void)
+{
+ change_signals(SIG_UNBLOCK);
+}
+
+/* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled
+ * together under SIGVTALRM_BIT. SIGPROF is excluded because we want to
+ * be able to profile all of UML, not just the non-critical sections. If
+ * profiling is not thread-safe, then that is not my problem. We can disable
+ * profiling when SMP is enabled in that case.
+ */
+#define SIGIO_BIT 0
+#define SIGVTALRM_BIT 1
+
+static int enable_mask(sigset_t *mask)
+{
+ int sigs;
+
+ sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT;
+ sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT;
+ sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT;
+ return(sigs);
+}
+
+int get_signals(void)
+{
+ sigset_t mask;
+
+ if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0)
+ panic("Failed to get signal mask");
+ return(enable_mask(&mask));
+}
+
+int set_signals(int enable)
+{
+ sigset_t mask;
+ int ret;
+
+ sigemptyset(&mask);
+ if(enable & (1 << SIGIO_BIT))
+ sigaddset(&mask, SIGIO);
+ if(enable & (1 << SIGVTALRM_BIT)){
+ sigaddset(&mask, SIGVTALRM);
+ sigaddset(&mask, SIGALRM);
+ }
+
+ /* This is safe - sigprocmask is guaranteed to copy locally the
+ * value of new_set, do his work and then, at the end, write to
+ * old_set.
+ */
+ if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0)
+ panic("Failed to enable signals");
+ ret = enable_mask(&mask);
+ sigemptyset(&mask);
+ if((enable & (1 << SIGIO_BIT)) == 0)
+ sigaddset(&mask, SIGIO);
+ if((enable & (1 << SIGVTALRM_BIT)) == 0){
+ sigaddset(&mask, SIGVTALRM);
+ sigaddset(&mask, SIGALRM);
+ }
+ if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
+ panic("Failed to block signals");
+
+ return(ret);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
new file mode 100644
index 0000000..d37d1bf
--- /dev/null
+++ b/arch/um/kernel/skas/Makefile
@@ -0,0 +1,13 @@
+#
+# Copyright (C) 2002 - 2004 Jeff Dike (jdike@addtoit.com)
+# Licensed under the GPL
+#
+
+obj-y := exec_kern.o mem.o mem_user.o mmu.o process.o process_kern.o \
+ syscall_kern.o syscall_user.o time.o tlb.o trap_user.o uaccess.o \
+
+subdir- := util
+
+USER_OBJS := process.o time.o
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/skas/exec_kern.c b/arch/um/kernel/skas/exec_kern.c
new file mode 100644
index 0000000..c6b4d5d
--- /dev/null
+++ b/arch/um/kernel/skas/exec_kern.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "asm/current.h"
+#include "asm/page.h"
+#include "asm/signal.h"
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+#include "asm/mmu_context.h"
+#include "tlb.h"
+#include "skas.h"
+#include "um_mmu.h"
+#include "os.h"
+
+void flush_thread_skas(void)
+{
+ force_flush_all();
+ switch_mm_skas(current->mm->context.skas.mm_fd);
+}
+
+void start_thread_skas(struct pt_regs *regs, unsigned long eip,
+ unsigned long esp)
+{
+ set_fs(USER_DS);
+ PT_REGS_IP(regs) = eip;
+ PT_REGS_SP(regs) = esp;
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/include/mmu-skas.h b/arch/um/kernel/skas/include/mmu-skas.h
new file mode 100644
index 0000000..4cd60d7
--- /dev/null
+++ b/arch/um/kernel/skas/include/mmu-skas.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_MMU_H
+#define __SKAS_MMU_H
+
+struct mmu_context_skas {
+ int mm_fd;
+};
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/include/mode-skas.h b/arch/um/kernel/skas/include/mode-skas.h
new file mode 100644
index 0000000..c1e33bd
--- /dev/null
+++ b/arch/um/kernel/skas/include/mode-skas.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MODE_SKAS_H__
+#define __MODE_SKAS_H__
+
+#include <sysdep/ptrace.h>
+
+extern unsigned long exec_regs[];
+extern unsigned long exec_fp_regs[];
+extern unsigned long exec_fpx_regs[];
+extern int have_fpx_regs;
+
+extern void user_time_init_skas(void);
+extern void sig_handler_common_skas(int sig, void *sc_ptr);
+extern void halt_skas(void);
+extern void reboot_skas(void);
+extern void kill_off_processes_skas(void);
+extern int is_skas_winch(int pid, int fd, void *data);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/include/mode_kern-skas.h b/arch/um/kernel/skas/include/mode_kern-skas.h
new file mode 100644
index 0000000..94c5649
--- /dev/null
+++ b/arch/um/kernel/skas/include/mode_kern-skas.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_MODE_KERN_H__
+#define __SKAS_MODE_KERN_H__
+
+#include "linux/sched.h"
+#include "asm/page.h"
+#include "asm/ptrace.h"
+
+extern void flush_thread_skas(void);
+extern void *switch_to_skas(void *prev, void *next);
+extern void start_thread_skas(struct pt_regs *regs, unsigned long eip,
+ unsigned long esp);
+extern int copy_thread_skas(int nr, unsigned long clone_flags,
+ unsigned long sp, unsigned long stack_top,
+ struct task_struct *p, struct pt_regs *regs);
+extern void release_thread_skas(struct task_struct *task);
+extern void exit_thread_skas(void);
+extern void initial_thread_cb_skas(void (*proc)(void *), void *arg);
+extern void init_idle_skas(void);
+extern void flush_tlb_kernel_range_skas(unsigned long start,
+ unsigned long end);
+extern void flush_tlb_kernel_vm_skas(void);
+extern void __flush_tlb_one_skas(unsigned long addr);
+extern void flush_tlb_range_skas(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end);
+extern void flush_tlb_mm_skas(struct mm_struct *mm);
+extern void force_flush_all_skas(void);
+extern long execute_syscall_skas(void *r);
+extern void before_mem_skas(unsigned long unused);
+extern unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
+ unsigned long *task_size_out);
+extern int start_uml_skas(void);
+extern int external_pid_skas(struct task_struct *task);
+extern int thread_pid_skas(struct task_struct *task);
+
+#define kmem_end_skas (host_task_size - 1024 * 1024)
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/include/proc_mm.h b/arch/um/kernel/skas/include/proc_mm.h
new file mode 100644
index 0000000..cce61a6
--- /dev/null
+++ b/arch/um/kernel/skas/include/proc_mm.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_PROC_MM_H
+#define __SKAS_PROC_MM_H
+
+#define MM_MMAP 54
+#define MM_MUNMAP 55
+#define MM_MPROTECT 56
+#define MM_COPY_SEGMENTS 57
+
+struct mm_mmap {
+ unsigned long addr;
+ unsigned long len;
+ unsigned long prot;
+ unsigned long flags;
+ unsigned long fd;
+ unsigned long offset;
+};
+
+struct mm_munmap {
+ unsigned long addr;
+ unsigned long len;
+};
+
+struct mm_mprotect {
+ unsigned long addr;
+ unsigned long len;
+ unsigned int prot;
+};
+
+struct proc_mm_op {
+ int op;
+ union {
+ struct mm_mmap mmap;
+ struct mm_munmap munmap;
+ struct mm_mprotect mprotect;
+ int copy_segments;
+ } u;
+};
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/include/skas.h b/arch/um/kernel/skas/include/skas.h
new file mode 100644
index 0000000..f0702c2
--- /dev/null
+++ b/arch/um/kernel/skas/include/skas.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_H
+#define __SKAS_H
+
+#include "sysdep/ptrace.h"
+
+extern int userspace_pid[];
+
+extern void switch_threads(void *me, void *next);
+extern void thread_wait(void *sw, void *fb);
+extern void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
+ void (*handler)(int));
+extern int start_idle_thread(void *stack, void *switch_buf_ptr,
+ void **fork_buf_ptr);
+extern int user_thread(unsigned long stack, int flags);
+extern void userspace(union uml_pt_regs *regs);
+extern void new_thread_proc(void *stack, void (*handler)(int sig));
+extern void remove_sigstack(void);
+extern void new_thread_handler(int sig);
+extern void handle_syscall(union uml_pt_regs *regs);
+extern void map(int fd, unsigned long virt, unsigned long len, int r, int w,
+ int x, int phys_fd, unsigned long long offset);
+extern int unmap(int fd, void *addr, unsigned long len);
+extern int protect(int fd, unsigned long addr, unsigned long len,
+ int r, int w, int x);
+extern void user_signal(int sig, union uml_pt_regs *regs);
+extern int new_mm(int from);
+extern void start_userspace(int cpu);
+extern long execute_syscall_skas(void *r);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/include/uaccess-skas.h b/arch/um/kernel/skas/include/uaccess-skas.h
new file mode 100644
index 0000000..11986c9
--- /dev/null
+++ b/arch/um/kernel/skas/include/uaccess-skas.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_UACCESS_H
+#define __SKAS_UACCESS_H
+
+#include "asm/errno.h"
+#include "asm/fixmap.h"
+
+#define access_ok_skas(type, addr, size) \
+ ((segment_eq(get_fs(), KERNEL_DS)) || \
+ (((unsigned long) (addr) < TASK_SIZE) && \
+ ((unsigned long) (addr) + (size) <= TASK_SIZE)) || \
+ ((type == VERIFY_READ ) && \
+ ((unsigned long) (addr) >= FIXADDR_USER_START) && \
+ ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
+ ((unsigned long) (addr) + (size) >= (unsigned long)(addr))))
+
+static inline int verify_area_skas(int type, const void * addr,
+ unsigned long size)
+{
+ return(access_ok_skas(type, addr, size) ? 0 : -EFAULT);
+}
+
+extern int copy_from_user_skas(void *to, const void *from, int n);
+extern int copy_to_user_skas(void *to, const void *from, int n);
+extern int strncpy_from_user_skas(char *dst, const char *src, int count);
+extern int __clear_user_skas(void *mem, int len);
+extern int clear_user_skas(void *mem, int len);
+extern int strnlen_user_skas(const void *str, int len);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/mem.c b/arch/um/kernel/skas/mem.c
new file mode 100644
index 0000000..438db2f
--- /dev/null
+++ b/arch/um/kernel/skas/mem.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/mm.h"
+#include "mem_user.h"
+
+unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
+ unsigned long *task_size_out)
+{
+ /* Round up to the nearest 4M */
+ unsigned long top = ROUND_4M((unsigned long) &arg);
+
+#ifdef CONFIG_HOST_TASK_SIZE
+ *host_size_out = CONFIG_HOST_TASK_SIZE;
+ *task_size_out = CONFIG_HOST_TASK_SIZE;
+#else
+ *host_size_out = top;
+ *task_size_out = top;
+#endif
+ return(((unsigned long) set_task_sizes_skas) & ~0xffffff);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/mem_user.c b/arch/um/kernel/skas/mem_user.c
new file mode 100644
index 0000000..1310bf1
--- /dev/null
+++ b/arch/um/kernel/skas/mem_user.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <sys/mman.h>
+#include "mem_user.h"
+#include "mem.h"
+#include "user.h"
+#include "os.h"
+#include "proc_mm.h"
+
+void map(int fd, unsigned long virt, unsigned long len, int r, int w,
+ int x, int phys_fd, unsigned long long offset)
+{
+ struct proc_mm_op map;
+ int prot, n;
+
+ prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ (x ? PROT_EXEC : 0);
+
+ map = ((struct proc_mm_op) { .op = MM_MMAP,
+ .u =
+ { .mmap =
+ { .addr = virt,
+ .len = len,
+ .prot = prot,
+ .flags = MAP_SHARED |
+ MAP_FIXED,
+ .fd = phys_fd,
+ .offset = offset
+ } } } );
+ n = os_write_file(fd, &map, sizeof(map));
+ if(n != sizeof(map))
+ printk("map : /proc/mm map failed, err = %d\n", -n);
+}
+
+int unmap(int fd, void *addr, unsigned long len)
+{
+ struct proc_mm_op unmap;
+ int n;
+
+ unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
+ .u =
+ { .munmap =
+ { .addr = (unsigned long) addr,
+ .len = len } } } );
+ n = os_write_file(fd, &unmap, sizeof(unmap));
+ if(n != sizeof(unmap)) {
+ if(n < 0)
+ return(n);
+ else if(n > 0)
+ return(-EIO);
+ }
+
+ return(0);
+}
+
+int protect(int fd, unsigned long addr, unsigned long len, int r, int w,
+ int x, int must_succeed)
+{
+ struct proc_mm_op protect;
+ int prot, n;
+
+ prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ (x ? PROT_EXEC : 0);
+
+ protect = ((struct proc_mm_op) { .op = MM_MPROTECT,
+ .u =
+ { .mprotect =
+ { .addr = (unsigned long) addr,
+ .len = len,
+ .prot = prot } } } );
+
+ n = os_write_file(fd, &protect, sizeof(protect));
+ if(n != sizeof(protect)) {
+ if(n == 0) return(0);
+
+ if(must_succeed)
+ panic("protect failed, err = %d", -n);
+
+ return(-EIO);
+ }
+
+ return(0);
+}
+
+void before_mem_skas(unsigned long unused)
+{
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
new file mode 100644
index 0000000..6cb9a6d
--- /dev/null
+++ b/arch/um/kernel/skas/mmu.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/list.h"
+#include "linux/spinlock.h"
+#include "linux/slab.h"
+#include "asm/current.h"
+#include "asm/segment.h"
+#include "asm/mmu.h"
+#include "os.h"
+#include "skas.h"
+
+int init_new_context_skas(struct task_struct *task, struct mm_struct *mm)
+{
+ int from;
+
+ if((current->mm != NULL) && (current->mm != &init_mm))
+ from = current->mm->context.skas.mm_fd;
+ else from = -1;
+
+ mm->context.skas.mm_fd = new_mm(from);
+ if(mm->context.skas.mm_fd < 0){
+ printk("init_new_context_skas - new_mm failed, errno = %d\n",
+ mm->context.skas.mm_fd);
+ return(mm->context.skas.mm_fd);
+ }
+
+ return(0);
+}
+
+void destroy_context_skas(struct mm_struct *mm)
+{
+ os_close_file(mm->context.skas.mm_fd);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
new file mode 100644
index 0000000..b4ffaaa
--- /dev/null
+++ b/arch/um/kernel/skas/process.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <setjmp.h>
+#include <sched.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
+#include <sys/user.h>
+#include <asm/unistd.h>
+#include "user.h"
+#include "ptrace_user.h"
+#include "time_user.h"
+#include "sysdep/ptrace.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "skas.h"
+#include "sysdep/sigcontext.h"
+#include "os.h"
+#include "proc_mm.h"
+#include "skas_ptrace.h"
+#include "chan_user.h"
+#include "signal_user.h"
+#include "registers.h"
+
+int is_skas_winch(int pid, int fd, void *data)
+{
+ if(pid != os_getpid())
+ return(0);
+
+ register_winch_irq(-1, fd, -1, data);
+ return(1);
+}
+
+static void handle_segv(int pid)
+{
+ struct ptrace_faultinfo fault;
+ int err;
+
+ err = ptrace(PTRACE_FAULTINFO, pid, 0, &fault);
+ if(err)
+ panic("handle_segv - PTRACE_FAULTINFO failed, errno = %d\n",
+ errno);
+
+ segv(fault.addr, 0, FAULT_WRITE(fault.is_write), 1, NULL);
+}
+
+/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
+static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
+{
+ int err, status;
+
+ /* Mark this as a syscall */
+ UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
+
+ if (!local_using_sysemu)
+ {
+ err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
+ if(err < 0)
+ panic("handle_trap - nullifying syscall failed errno = %d\n",
+ errno);
+
+ err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
+ if(err < 0)
+ panic("handle_trap - continuing to end of syscall failed, "
+ "errno = %d\n", errno);
+
+ CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
+ if((err < 0) || !WIFSTOPPED(status) ||
+ (WSTOPSIG(status) != SIGTRAP + 0x80))
+ panic("handle_trap - failed to wait at end of syscall, "
+ "errno = %d, status = %d\n", errno, status);
+ }
+
+ handle_syscall(regs);
+}
+
+static int userspace_tramp(void *arg)
+{
+ init_new_thread_signals(0);
+ enable_timer();
+ ptrace(PTRACE_TRACEME, 0, 0, 0);
+ os_stop_process(os_getpid());
+ return(0);
+}
+
+/* Each element set once, and only accessed by a single processor anyway */
+#undef NR_CPUS
+#define NR_CPUS 1
+int userspace_pid[NR_CPUS];
+
+void start_userspace(int cpu)
+{
+ void *stack;
+ unsigned long sp;
+ int pid, status, n;
+
+ stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if(stack == MAP_FAILED)
+ panic("start_userspace : mmap failed, errno = %d", errno);
+ sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
+
+ pid = clone(userspace_tramp, (void *) sp,
+ CLONE_FILES | CLONE_VM | SIGCHLD, NULL);
+ if(pid < 0)
+ panic("start_userspace : clone failed, errno = %d", errno);
+
+ do {
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if(n < 0)
+ panic("start_userspace : wait failed, errno = %d",
+ errno);
+ } while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
+
+ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
+ panic("start_userspace : expected SIGSTOP, got status = %d",
+ status);
+
+ if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0)
+ panic("start_userspace : PTRACE_SETOPTIONS failed, errno=%d\n",
+ errno);
+
+ if(munmap(stack, PAGE_SIZE) < 0)
+ panic("start_userspace : munmap failed, errno = %d\n", errno);
+
+ userspace_pid[cpu] = pid;
+}
+
+void userspace(union uml_pt_regs *regs)
+{
+ int err, status, op, pid = userspace_pid[0];
+ int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
+
+ while(1){
+ restore_registers(pid, regs);
+
+ /* Now we set local_using_sysemu to be used for one loop */
+ local_using_sysemu = get_using_sysemu();
+
+ op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
+
+ err = ptrace(op, pid, 0, 0);
+ if(err)
+ panic("userspace - could not resume userspace process, "
+ "pid=%d, ptrace operation = %d, errno = %d\n",
+ op, errno);
+
+ CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
+ if(err < 0)
+ panic("userspace - waitpid failed, errno = %d\n",
+ errno);
+
+ regs->skas.is_user = 1;
+ save_registers(pid, regs);
+ UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
+
+ if(WIFSTOPPED(status)){
+ switch(WSTOPSIG(status)){
+ case SIGSEGV:
+ handle_segv(pid);
+ break;
+ case SIGTRAP + 0x80:
+ handle_trap(pid, regs, local_using_sysemu);
+ break;
+ case SIGTRAP:
+ relay_signal(SIGTRAP, regs);
+ break;
+ case SIGIO:
+ case SIGVTALRM:
+ case SIGILL:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGWINCH:
+ user_signal(WSTOPSIG(status), regs);
+ break;
+ default:
+ printk("userspace - child stopped with signal "
+ "%d\n", WSTOPSIG(status));
+ }
+ interrupt_end();
+
+ /* Avoid -ERESTARTSYS handling in host */
+ PT_SYSCALL_NR(regs->skas.regs) = -1;
+ }
+ }
+}
+
+void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
+ void (*handler)(int))
+{
+ unsigned long flags;
+ sigjmp_buf switch_buf, fork_buf;
+
+ *switch_buf_ptr = &switch_buf;
+ *fork_buf_ptr = &fork_buf;
+
+ /* Somewhat subtle - siglongjmp restores the signal mask before doing
+ * the longjmp. This means that when jumping from one stack to another
+ * when the target stack has interrupts enabled, an interrupt may occur
+ * on the source stack. This is bad when starting up a process because
+ * it's not supposed to get timer ticks until it has been scheduled.
+ * So, we disable interrupts around the sigsetjmp to ensure that
+ * they can't happen until we get back here where they are safe.
+ */
+ flags = get_signals();
+ block_signals();
+ if(sigsetjmp(fork_buf, 1) == 0)
+ new_thread_proc(stack, handler);
+
+ remove_sigstack();
+
+ set_signals(flags);
+}
+
+void thread_wait(void *sw, void *fb)
+{
+ sigjmp_buf buf, **switch_buf = sw, *fork_buf;
+
+ *switch_buf = &buf;
+ fork_buf = fb;
+ if(sigsetjmp(buf, 1) == 0)
+ siglongjmp(*fork_buf, 1);
+}
+
+void switch_threads(void *me, void *next)
+{
+ sigjmp_buf my_buf, **me_ptr = me, *next_buf = next;
+
+ *me_ptr = &my_buf;
+ if(sigsetjmp(my_buf, 1) == 0)
+ siglongjmp(*next_buf, 1);
+}
+
+static sigjmp_buf initial_jmpbuf;
+
+/* XXX Make these percpu */
+static void (*cb_proc)(void *arg);
+static void *cb_arg;
+static sigjmp_buf *cb_back;
+
+int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
+{
+ sigjmp_buf **switch_buf = switch_buf_ptr;
+ int n;
+
+ *fork_buf_ptr = &initial_jmpbuf;
+ n = sigsetjmp(initial_jmpbuf, 1);
+ if(n == 0)
+ new_thread_proc((void *) stack, new_thread_handler);
+ else if(n == 1)
+ remove_sigstack();
+ else if(n == 2){
+ (*cb_proc)(cb_arg);
+ siglongjmp(*cb_back, 1);
+ }
+ else if(n == 3){
+ kmalloc_ok = 0;
+ return(0);
+ }
+ else if(n == 4){
+ kmalloc_ok = 0;
+ return(1);
+ }
+ siglongjmp(**switch_buf, 1);
+}
+
+void remove_sigstack(void)
+{
+ stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE,
+ .ss_sp = NULL,
+ .ss_size = 0 });
+
+ if(sigaltstack(&stack, NULL) != 0)
+ panic("disabling signal stack failed, errno = %d\n", errno);
+}
+
+void initial_thread_cb_skas(void (*proc)(void *), void *arg)
+{
+ sigjmp_buf here;
+
+ cb_proc = proc;
+ cb_arg = arg;
+ cb_back = &here;
+
+ block_signals();
+ if(sigsetjmp(here, 1) == 0)
+ siglongjmp(initial_jmpbuf, 2);
+ unblock_signals();
+
+ cb_proc = NULL;
+ cb_arg = NULL;
+ cb_back = NULL;
+}
+
+void halt_skas(void)
+{
+ block_signals();
+ siglongjmp(initial_jmpbuf, 3);
+}
+
+void reboot_skas(void)
+{
+ block_signals();
+ siglongjmp(initial_jmpbuf, 4);
+}
+
+void switch_mm_skas(int mm_fd)
+{
+ int err;
+
+#warning need cpu pid in switch_mm_skas
+ err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0, mm_fd);
+ if(err)
+ panic("switch_mm_skas - PTRACE_SWITCH_MM failed, errno = %d\n",
+ errno);
+}
+
+void kill_off_processes_skas(void)
+{
+#warning need to loop over userspace_pids in kill_off_processes_skas
+ os_kill_ptraced_process(userspace_pid[0], 1);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
new file mode 100644
index 0000000..5d096ea
--- /dev/null
+++ b/arch/um/kernel/skas/process_kern.c
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/slab.h"
+#include "linux/ptrace.h"
+#include "linux/proc_fs.h"
+#include "linux/file.h"
+#include "linux/errno.h"
+#include "linux/init.h"
+#include "asm/uaccess.h"
+#include "asm/atomic.h"
+#include "kern_util.h"
+#include "time_user.h"
+#include "signal_user.h"
+#include "skas.h"
+#include "os.h"
+#include "user_util.h"
+#include "tlb.h"
+#include "kern.h"
+#include "mode.h"
+#include "proc_mm.h"
+#include "registers.h"
+
+void *switch_to_skas(void *prev, void *next)
+{
+ struct task_struct *from, *to;
+
+ from = prev;
+ to = next;
+
+ /* XXX need to check runqueues[cpu].idle */
+ if(current->pid == 0)
+ switch_timers(0);
+
+ to->thread.prev_sched = from;
+ set_current(to);
+
+ switch_threads(&from->thread.mode.skas.switch_buf,
+ to->thread.mode.skas.switch_buf);
+
+ if(current->pid == 0)
+ switch_timers(1);
+
+ return(current->thread.prev_sched);
+}
+
+extern void schedule_tail(struct task_struct *prev);
+
+void new_thread_handler(int sig)
+{
+ int (*fn)(void *), n;
+ void *arg;
+
+ fn = current->thread.request.u.thread.proc;
+ arg = current->thread.request.u.thread.arg;
+ change_sig(SIGUSR1, 1);
+ thread_wait(¤t->thread.mode.skas.switch_buf,
+ current->thread.mode.skas.fork_buf);
+
+ if(current->thread.prev_sched != NULL)
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ /* The return value is 1 if the kernel thread execs a process,
+ * 0 if it just exits
+ */
+ n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf);
+ if(n == 1)
+ userspace(¤t->thread.regs.regs);
+ else do_exit(0);
+}
+
+void new_thread_proc(void *stack, void (*handler)(int sig))
+{
+ init_new_thread_stack(stack, handler);
+ os_usr1_process(os_getpid());
+}
+
+void release_thread_skas(struct task_struct *task)
+{
+}
+
+void exit_thread_skas(void)
+{
+}
+
+void fork_handler(int sig)
+{
+ change_sig(SIGUSR1, 1);
+ thread_wait(¤t->thread.mode.skas.switch_buf,
+ current->thread.mode.skas.fork_buf);
+
+ force_flush_all();
+ if(current->thread.prev_sched == NULL)
+ panic("blech");
+
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ userspace(¤t->thread.regs.regs);
+}
+
+int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
+ unsigned long stack_top, struct task_struct * p,
+ struct pt_regs *regs)
+{
+ void (*handler)(int);
+
+ if(current->thread.forking){
+ memcpy(&p->thread.regs.regs.skas,
+ ¤t->thread.regs.regs.skas,
+ sizeof(p->thread.regs.regs.skas));
+ REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
+ if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
+
+ handler = fork_handler;
+ }
+ else {
+ init_thread_registers(&p->thread.regs.regs);
+ p->thread.request.u.thread = current->thread.request.u.thread;
+ handler = new_thread_handler;
+ }
+
+ new_thread(p->thread_info, &p->thread.mode.skas.switch_buf,
+ &p->thread.mode.skas.fork_buf, handler);
+ return(0);
+}
+
+int new_mm(int from)
+{
+ struct proc_mm_op copy;
+ int n, fd;
+
+ fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
+ if(fd < 0)
+ return(fd);
+
+ if(from != -1){
+ copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS,
+ .u =
+ { .copy_segments = from } } );
+ n = os_write_file(fd, ©, sizeof(copy));
+ if(n != sizeof(copy))
+ printk("new_mm : /proc/mm copy_segments failed, "
+ "err = %d\n", -n);
+ }
+
+ return(fd);
+}
+
+void init_idle_skas(void)
+{
+ cpu_tasks[current_thread->cpu].pid = os_getpid();
+ default_idle();
+}
+
+extern void start_kernel(void);
+
+static int start_kernel_proc(void *unused)
+{
+ int pid;
+
+ block_signals();
+ pid = os_getpid();
+
+ cpu_tasks[0].pid = pid;
+ cpu_tasks[0].task = current;
+#ifdef CONFIG_SMP
+ cpu_online_map = cpumask_of_cpu(0);
+#endif
+ start_kernel();
+ return(0);
+}
+
+int start_uml_skas(void)
+{
+ start_userspace(0);
+
+ init_new_thread_signals(1);
+ uml_idle_timer();
+
+ init_task.thread.request.u.thread.proc = start_kernel_proc;
+ init_task.thread.request.u.thread.arg = NULL;
+ return(start_idle_thread(init_task.thread_info,
+ &init_task.thread.mode.skas.switch_buf,
+ &init_task.thread.mode.skas.fork_buf));
+}
+
+int external_pid_skas(struct task_struct *task)
+{
+#warning Need to look up userspace_pid by cpu
+ return(userspace_pid[0]);
+}
+
+int thread_pid_skas(struct task_struct *task)
+{
+#warning Need to look up userspace_pid by cpu
+ return(userspace_pid[0]);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/syscall_kern.c b/arch/um/kernel/skas/syscall_kern.c
new file mode 100644
index 0000000..bdf040c
--- /dev/null
+++ b/arch/um/kernel/skas/syscall_kern.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sys.h"
+#include "linux/ptrace.h"
+#include "asm/errno.h"
+#include "asm/unistd.h"
+#include "asm/ptrace.h"
+#include "asm/current.h"
+#include "sysdep/syscalls.h"
+#include "kern_util.h"
+
+extern syscall_handler_t *sys_call_table[];
+
+long execute_syscall_skas(void *r)
+{
+ struct pt_regs *regs = r;
+ long res;
+ int syscall;
+
+ current->thread.nsyscalls++;
+ nsyscalls++;
+ syscall = UPT_SYSCALL_NR(®s->regs);
+
+ if((syscall >= NR_syscalls) || (syscall < 0))
+ res = -ENOSYS;
+ else res = EXECUTE_SYSCALL(syscall, regs);
+
+ return(res);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/syscall_user.c b/arch/um/kernel/skas/syscall_user.c
new file mode 100644
index 0000000..2828e6e
--- /dev/null
+++ b/arch/um/kernel/skas/syscall_user.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <signal.h>
+#include "kern_util.h"
+#include "uml-config.h"
+#include "syscall_user.h"
+#include "sysdep/ptrace.h"
+#include "sysdep/sigcontext.h"
+#include "skas.h"
+
+void handle_syscall(union uml_pt_regs *regs)
+{
+ long result;
+#if UML_CONFIG_SYSCALL_DEBUG
+ int index;
+
+ index = record_syscall_start(UPT_SYSCALL_NR(regs));
+#endif
+
+ syscall_trace(regs, 0);
+ result = execute_syscall_skas(regs);
+
+ REGS_SET_SYSCALL_RETURN(regs->skas.regs, result);
+
+ syscall_trace(regs, 1);
+#if UML_CONFIG_SYSCALL_DEBUG
+ record_syscall_end(index, result);
+#endif
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/time.c b/arch/um/kernel/skas/time.c
new file mode 100644
index 0000000..9809149
--- /dev/null
+++ b/arch/um/kernel/skas/time.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <sys/signal.h>
+#include <sys/time.h>
+#include "time_user.h"
+#include "process.h"
+#include "user.h"
+
+void user_time_init_skas(void)
+{
+ if(signal(SIGALRM, (__sighandler_t) alarm_handler) == SIG_ERR)
+ panic("Couldn't set SIGALRM handler");
+ if(signal(SIGVTALRM, (__sighandler_t) alarm_handler) == SIG_ERR)
+ panic("Couldn't set SIGVTALRM handler");
+ set_interval(ITIMER_VIRTUAL);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
new file mode 100644
index 0000000..b8c5e717
--- /dev/null
+++ b/arch/um/kernel/skas/tlb.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/sched.h"
+#include "linux/mm.h"
+#include "asm/page.h"
+#include "asm/pgtable.h"
+#include "asm/mmu.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "mem.h"
+#include "skas.h"
+#include "os.h"
+#include "tlb.h"
+
+static void do_ops(int fd, struct host_vm_op *ops, int last)
+{
+ struct host_vm_op *op;
+ int i;
+
+ for(i = 0; i <= last; i++){
+ op = &ops[i];
+ switch(op->type){
+ case MMAP:
+ map(fd, op->u.mmap.addr, op->u.mmap.len,
+ op->u.mmap.r, op->u.mmap.w, op->u.mmap.x,
+ op->u.mmap.fd, op->u.mmap.offset);
+ break;
+ case MUNMAP:
+ unmap(fd, (void *) op->u.munmap.addr,
+ op->u.munmap.len);
+ break;
+ case MPROTECT:
+ protect(fd, op->u.mprotect.addr, op->u.mprotect.len,
+ op->u.mprotect.r, op->u.mprotect.w,
+ op->u.mprotect.x);
+ break;
+ default:
+ printk("Unknown op type %d in do_ops\n", op->type);
+ break;
+ }
+ }
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr,
+ unsigned long end_addr, int force)
+{
+ int fd = mm->context.skas.mm_fd;
+
+ fix_range_common(mm, start_addr, end_addr, force, fd, do_ops);
+}
+
+void __flush_tlb_one_skas(unsigned long addr)
+{
+ flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
+}
+
+void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ if(vma->vm_mm == NULL)
+ flush_tlb_kernel_range_common(start, end);
+ else fix_range(vma->vm_mm, start, end, 0);
+}
+
+void flush_tlb_mm_skas(struct mm_struct *mm)
+{
+ /* Don't bother flushing if this address space is about to be
+ * destroyed.
+ */
+ if(atomic_read(&mm->mm_users) == 0)
+ return;
+
+ fix_range(mm, 0, host_task_size, 0);
+ flush_tlb_kernel_range_common(start_vm, end_vm);
+}
+
+void force_flush_all_skas(void)
+{
+ fix_range(current->mm, 0, host_task_size, 1);
+}
diff --git a/arch/um/kernel/skas/trap_user.c b/arch/um/kernel/skas/trap_user.c
new file mode 100644
index 0000000..8e9b46d
--- /dev/null
+++ b/arch/um/kernel/skas/trap_user.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+#include <errno.h>
+#include "sysdep/ptrace.h"
+#include "signal_user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "task.h"
+#include "sigcontext.h"
+
+void sig_handler_common_skas(int sig, void *sc_ptr)
+{
+ struct sigcontext *sc = sc_ptr;
+ struct skas_regs *r;
+ struct signal_info *info;
+ int save_errno = errno;
+ int save_user;
+
+ /* This is done because to allow SIGSEGV to be delivered inside a SEGV
+ * handler. This can happen in copy_user, and if SEGV is disabled,
+ * the process will die.
+ * XXX Figure out why this is better than SA_NODEFER
+ */
+ if(sig == SIGSEGV)
+ change_sig(SIGSEGV, 1);
+
+ r = &TASK_REGS(get_current())->skas;
+ save_user = r->is_user;
+ r->is_user = 0;
+ r->fault_addr = SC_FAULT_ADDR(sc);
+ r->fault_type = SC_FAULT_TYPE(sc);
+ r->trap_type = SC_TRAP_TYPE(sc);
+
+ change_sig(SIGUSR1, 1);
+ info = &sig_info[sig];
+ if(!info->is_irq) unblock_signals();
+
+ (*info->handler)(sig, (union uml_pt_regs *) r);
+
+ errno = save_errno;
+ r->is_user = save_user;
+}
+
+void user_signal(int sig, union uml_pt_regs *regs)
+{
+ struct signal_info *info;
+
+ regs->skas.is_user = 1;
+ regs->skas.fault_addr = 0;
+ regs->skas.fault_type = 0;
+ regs->skas.trap_type = 0;
+ info = &sig_info[sig];
+ (*info->handler)(sig, regs);
+
+ unblock_signals();
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
new file mode 100644
index 0000000..7575ec4
--- /dev/null
+++ b/arch/um/kernel/skas/uaccess.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/kernel.h"
+#include "linux/string.h"
+#include "linux/fs.h"
+#include "linux/highmem.h"
+#include "asm/page.h"
+#include "asm/pgtable.h"
+#include "asm/uaccess.h"
+#include "kern_util.h"
+#include "user_util.h"
+
+extern void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
+ pte_t *pte_out);
+
+static unsigned long maybe_map(unsigned long virt, int is_write)
+{
+ pte_t pte;
+ int err;
+
+ void *phys = um_virt_to_phys(current, virt, &pte);
+ int dummy_code;
+
+ if(IS_ERR(phys) || (is_write && !pte_write(pte))){
+ err = handle_page_fault(virt, 0, is_write, 1, &dummy_code);
+ if(err)
+ return(0);
+ phys = um_virt_to_phys(current, virt, NULL);
+ }
+ return((unsigned long) phys);
+}
+
+static int do_op(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long addr, int len, void *arg), void *arg)
+{
+ struct page *page;
+ int n;
+
+ addr = maybe_map(addr, is_write);
+ if(addr == -1)
+ return(-1);
+
+ page = phys_to_page(addr);
+ addr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
+ n = (*op)(addr, len, arg);
+ kunmap(page);
+
+ return(n);
+}
+
+static void do_buffer_op(void *jmpbuf, void *arg_ptr)
+{
+ va_list args;
+ unsigned long addr;
+ int len, is_write, size, remain, n;
+ int (*op)(unsigned long, int, void *);
+ void *arg;
+ int *res;
+
+ /* Some old gccs recognize __va_copy, but not va_copy */
+ __va_copy(args, *(va_list *)arg_ptr);
+ addr = va_arg(args, unsigned long);
+ len = va_arg(args, int);
+ is_write = va_arg(args, int);
+ op = va_arg(args, void *);
+ arg = va_arg(args, void *);
+ res = va_arg(args, int *);
+ va_end(args);
+ size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);
+ remain = len;
+
+ current->thread.fault_catcher = jmpbuf;
+ n = do_op(addr, size, is_write, op, arg);
+ if(n != 0){
+ *res = (n < 0 ? remain : 0);
+ goto out;
+ }
+
+ addr += size;
+ remain -= size;
+ if(remain == 0){
+ *res = 0;
+ goto out;
+ }
+
+ while(addr < ((addr + remain) & PAGE_MASK)){
+ n = do_op(addr, PAGE_SIZE, is_write, op, arg);
+ if(n != 0){
+ *res = (n < 0 ? remain : 0);
+ goto out;
+ }
+
+ addr += PAGE_SIZE;
+ remain -= PAGE_SIZE;
+ }
+ if(remain == 0){
+ *res = 0;
+ goto out;
+ }
+
+ n = do_op(addr, remain, is_write, op, arg);
+ if(n != 0)
+ *res = (n < 0 ? remain : 0);
+ else *res = 0;
+ out:
+ current->thread.fault_catcher = NULL;
+}
+
+static int buffer_op(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long addr, int len, void *arg),
+ void *arg)
+{
+ int faulted, res;
+
+ faulted = setjmp_wrapper(do_buffer_op, addr, len, is_write, op, arg,
+ &res);
+ if(!faulted)
+ return(res);
+
+ return(addr + len - (unsigned long) current->thread.fault_addr);
+}
+
+static int copy_chunk_from_user(unsigned long from, int len, void *arg)
+{
+ unsigned long *to_ptr = arg, to = *to_ptr;
+
+ memcpy((void *) to, (void *) from, len);
+ *to_ptr += len;
+ return(0);
+}
+
+int copy_from_user_skas(void *to, const void __user *from, int n)
+{
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ memcpy(to, (__force void*)from, n);
+ return(0);
+ }
+
+ return(access_ok_skas(VERIFY_READ, from, n) ?
+ buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to):
+ n);
+}
+
+static int copy_chunk_to_user(unsigned long to, int len, void *arg)
+{
+ unsigned long *from_ptr = arg, from = *from_ptr;
+
+ memcpy((void *) to, (void *) from, len);
+ *from_ptr += len;
+ return(0);
+}
+
+int copy_to_user_skas(void __user *to, const void *from, int n)
+{
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ memcpy((__force void*)to, from, n);
+ return(0);
+ }
+
+ return(access_ok_skas(VERIFY_WRITE, to, n) ?
+ buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from) :
+ n);
+}
+
+static int strncpy_chunk_from_user(unsigned long from, int len, void *arg)
+{
+ char **to_ptr = arg, *to = *to_ptr;
+ int n;
+
+ strncpy(to, (void *) from, len);
+ n = strnlen(to, len);
+ *to_ptr += n;
+
+ if(n < len)
+ return(1);
+ return(0);
+}
+
+int strncpy_from_user_skas(char *dst, const char __user *src, int count)
+{
+ int n;
+ char *ptr = dst;
+
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ strncpy(dst, (__force void*)src, count);
+ return(strnlen(dst, count));
+ }
+
+ if(!access_ok_skas(VERIFY_READ, src, 1))
+ return(-EFAULT);
+
+ n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
+ &ptr);
+ if(n != 0)
+ return(-EFAULT);
+ return(strnlen(dst, count));
+}
+
+static int clear_chunk(unsigned long addr, int len, void *unused)
+{
+ memset((void *) addr, 0, len);
+ return(0);
+}
+
+int __clear_user_skas(void __user *mem, int len)
+{
+ return(buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL));
+}
+
+int clear_user_skas(void __user *mem, int len)
+{
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ memset((__force void*)mem, 0, len);
+ return(0);
+ }
+
+ return(access_ok_skas(VERIFY_WRITE, mem, len) ?
+ buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len);
+}
+
+static int strnlen_chunk(unsigned long str, int len, void *arg)
+{
+ int *len_ptr = arg, n;
+
+ n = strnlen((void *) str, len);
+ *len_ptr += n;
+
+ if(n < len)
+ return(1);
+ return(0);
+}
+
+int strnlen_user_skas(const void __user *str, int len)
+{
+ int count = 0, n;
+
+ if(segment_eq(get_fs(), KERNEL_DS))
+ return(strnlen((__force char*)str, len) + 1);
+
+ n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
+ if(n == 0)
+ return(count + 1);
+ return(-EFAULT);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/util/Makefile b/arch/um/kernel/skas/util/Makefile
new file mode 100644
index 0000000..17f5909
--- /dev/null
+++ b/arch/um/kernel/skas/util/Makefile
@@ -0,0 +1,4 @@
+hostprogs-y := mk_ptregs
+always := $(hostprogs-y)
+
+mk_ptregs-objs := mk_ptregs-$(SUBARCH).o
diff --git a/arch/um/kernel/skas/util/mk_ptregs-i386.c b/arch/um/kernel/skas/util/mk_ptregs-i386.c
new file mode 100644
index 0000000..0788dd0
--- /dev/null
+++ b/arch/um/kernel/skas/util/mk_ptregs-i386.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <asm/ptrace.h>
+#include <asm/user.h>
+
+#define PRINT_REG(name, val) printf("#define HOST_%s %d\n", (name), (val))
+
+int main(int argc, char **argv)
+{
+ printf("/* Automatically generated by "
+ "arch/um/kernel/skas/util/mk_ptregs */\n");
+ printf("\n");
+ printf("#ifndef __SKAS_PT_REGS_\n");
+ printf("#define __SKAS_PT_REGS_\n");
+ printf("\n");
+ printf("#define HOST_FRAME_SIZE %d\n", FRAME_SIZE);
+ printf("#define HOST_FP_SIZE %d\n",
+ sizeof(struct user_i387_struct) / sizeof(unsigned long));
+ printf("#define HOST_XFP_SIZE %d\n",
+ sizeof(struct user_fxsr_struct) / sizeof(unsigned long));
+
+ PRINT_REG("IP", EIP);
+ PRINT_REG("SP", UESP);
+ PRINT_REG("EFLAGS", EFL);
+ PRINT_REG("EAX", EAX);
+ PRINT_REG("EBX", EBX);
+ PRINT_REG("ECX", ECX);
+ PRINT_REG("EDX", EDX);
+ PRINT_REG("ESI", ESI);
+ PRINT_REG("EDI", EDI);
+ PRINT_REG("EBP", EBP);
+ PRINT_REG("CS", CS);
+ PRINT_REG("SS", SS);
+ PRINT_REG("DS", DS);
+ PRINT_REG("FS", FS);
+ PRINT_REG("ES", ES);
+ PRINT_REG("GS", GS);
+ printf("\n");
+ printf("#endif\n");
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/skas/util/mk_ptregs-x86_64.c b/arch/um/kernel/skas/util/mk_ptregs-x86_64.c
new file mode 100644
index 0000000..67aee92
--- /dev/null
+++ b/arch/um/kernel/skas/util/mk_ptregs-x86_64.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#define __FRAME_OFFSETS
+#include <asm/ptrace.h>
+
+#define PRINT_REG(name, val) \
+ printf("#define HOST_%s (%d / sizeof(unsigned long))\n", (name), (val))
+
+int main(int argc, char **argv)
+{
+ printf("/* Automatically generated by "
+ "arch/um/kernel/skas/util/mk_ptregs */\n");
+ printf("\n");
+ printf("#ifndef __SKAS_PT_REGS_\n");
+ printf("#define __SKAS_PT_REGS_\n");
+ printf("#define HOST_FRAME_SIZE (%d / sizeof(unsigned long))\n",
+ FRAME_SIZE);
+ PRINT_REG("RBX", RBX);
+ PRINT_REG("RCX", RCX);
+ PRINT_REG("RDI", RDI);
+ PRINT_REG("RSI", RSI);
+ PRINT_REG("RDX", RDX);
+ PRINT_REG("RBP", RBP);
+ PRINT_REG("RAX", RAX);
+ PRINT_REG("R8", R8);
+ PRINT_REG("R9", R9);
+ PRINT_REG("R10", R10);
+ PRINT_REG("R11", R11);
+ PRINT_REG("R12", R12);
+ PRINT_REG("R13", R13);
+ PRINT_REG("R14", R14);
+ PRINT_REG("R15", R15);
+ PRINT_REG("ORIG_RAX", ORIG_RAX);
+ PRINT_REG("CS", CS);
+ PRINT_REG("SS", SS);
+ PRINT_REG("EFLAGS", EFLAGS);
+#if 0
+ PRINT_REG("FS", FS);
+ PRINT_REG("GS", GS);
+ PRINT_REG("DS", DS);
+ PRINT_REG("ES", ES);
+#endif
+
+ PRINT_REG("IP", RIP);
+ PRINT_REG("SP", RSP);
+ printf("#define HOST_FP_SIZE 0\n");
+ printf("#define HOST_XFP_SIZE 0\n");
+ printf("\n");
+ printf("\n");
+ printf("#endif\n");
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/smp.c b/arch/um/kernel/smp.c
new file mode 100644
index 0000000..72113b0
--- /dev/null
+++ b/arch/um/kernel/smp.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/percpu.h"
+#include "asm/pgalloc.h"
+#include "asm/tlb.h"
+
+/* For some reason, mmu_gathers are referenced when CONFIG_SMP is off. */
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+#ifdef CONFIG_SMP
+
+#include "linux/sched.h"
+#include "linux/module.h"
+#include "linux/threads.h"
+#include "linux/interrupt.h"
+#include "linux/err.h"
+#include "linux/hardirq.h"
+#include "asm/smp.h"
+#include "asm/processor.h"
+#include "asm/spinlock.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "irq_user.h"
+#include "os.h"
+
+/* CPU online map, set by smp_boot_cpus */
+cpumask_t cpu_online_map = CPU_MASK_NONE;
+cpumask_t cpu_possible_map = CPU_MASK_NONE;
+
+EXPORT_SYMBOL(cpu_online_map);
+EXPORT_SYMBOL(cpu_possible_map);
+
+/* Per CPU bogomips and other parameters
+ * The only piece used here is the ipi pipe, which is set before SMP is
+ * started and never changed.
+ */
+struct cpuinfo_um cpu_data[NR_CPUS];
+
+/* A statistic, can be a little off */
+int num_reschedules_sent = 0;
+
+/* Not changed after boot */
+struct task_struct *idle_threads[NR_CPUS];
+
+void smp_send_reschedule(int cpu)
+{
+ os_write_file(cpu_data[cpu].ipi_pipe[1], "R", 1);
+ num_reschedules_sent++;
+}
+
+void smp_send_stop(void)
+{
+ int i;
+
+ printk(KERN_INFO "Stopping all CPUs...");
+ for(i = 0; i < num_online_cpus(); i++){
+ if(i == current_thread->cpu)
+ continue;
+ os_write_file(cpu_data[i].ipi_pipe[1], "S", 1);
+ }
+ printk("done\n");
+}
+
+static cpumask_t smp_commenced_mask = CPU_MASK_NONE;
+static cpumask_t cpu_callin_map = CPU_MASK_NONE;
+
+static int idle_proc(void *cpup)
+{
+ int cpu = (int) cpup, err;
+
+ err = os_pipe(cpu_data[cpu].ipi_pipe, 1, 1);
+ if(err < 0)
+ panic("CPU#%d failed to create IPI pipe, err = %d", cpu, -err);
+
+ activate_ipi(cpu_data[cpu].ipi_pipe[0],
+ current->thread.mode.tt.extern_pid);
+
+ wmb();
+ if (cpu_test_and_set(cpu, cpu_callin_map)) {
+ printk("huh, CPU#%d already present??\n", cpu);
+ BUG();
+ }
+
+ while (!cpu_isset(cpu, smp_commenced_mask))
+ cpu_relax();
+
+ cpu_set(cpu, cpu_online_map);
+ default_idle();
+ return(0);
+}
+
+static struct task_struct *idle_thread(int cpu)
+{
+ struct task_struct *new_task;
+ unsigned char c;
+
+ current->thread.request.u.thread.proc = idle_proc;
+ current->thread.request.u.thread.arg = (void *) cpu;
+ new_task = fork_idle(cpu);
+ if(IS_ERR(new_task))
+ panic("copy_process failed in idle_thread, error = %ld",
+ PTR_ERR(new_task));
+
+ cpu_tasks[cpu] = ((struct cpu_task)
+ { .pid = new_task->thread.mode.tt.extern_pid,
+ .task = new_task } );
+ idle_threads[cpu] = new_task;
+ CHOOSE_MODE(os_write_file(new_task->thread.mode.tt.switch_pipe[1], &c,
+ sizeof(c)),
+ ({ panic("skas mode doesn't support SMP"); }));
+ return(new_task);
+}
+
+void smp_prepare_cpus(unsigned int maxcpus)
+{
+ struct task_struct *idle;
+ unsigned long waittime;
+ int err, cpu, me = smp_processor_id();
+ int i;
+
+ for (i = 0; i < ncpus; ++i)
+ cpu_set(i, cpu_possible_map);
+
+ cpu_clear(me, cpu_online_map);
+ cpu_set(me, cpu_online_map);
+ cpu_set(me, cpu_callin_map);
+
+ err = os_pipe(cpu_data[me].ipi_pipe, 1, 1);
+ if(err < 0)
+ panic("CPU#0 failed to create IPI pipe, errno = %d", -err);
+
+ activate_ipi(cpu_data[me].ipi_pipe[0],
+ current->thread.mode.tt.extern_pid);
+
+ for(cpu = 1; cpu < ncpus; cpu++){
+ printk("Booting processor %d...\n", cpu);
+
+ idle = idle_thread(cpu);
+
+ init_idle(idle, cpu);
+ unhash_process(idle);
+
+ waittime = 200000000;
+ while (waittime-- && !cpu_isset(cpu, cpu_callin_map))
+ cpu_relax();
+
+ if (cpu_isset(cpu, cpu_callin_map))
+ printk("done\n");
+ else printk("failed\n");
+ }
+}
+
+void smp_prepare_boot_cpu(void)
+{
+ cpu_set(smp_processor_id(), cpu_online_map);
+}
+
+int __cpu_up(unsigned int cpu)
+{
+ cpu_set(cpu, smp_commenced_mask);
+ while (!cpu_isset(cpu, cpu_online_map))
+ mb();
+ return(0);
+}
+
+int setup_profiling_timer(unsigned int multiplier)
+{
+ printk(KERN_INFO "setup_profiling_timer\n");
+ return(0);
+}
+
+void smp_call_function_slave(int cpu);
+
+void IPI_handler(int cpu)
+{
+ unsigned char c;
+ int fd;
+
+ fd = cpu_data[cpu].ipi_pipe[0];
+ while (os_read_file(fd, &c, 1) == 1) {
+ switch (c) {
+ case 'C':
+ smp_call_function_slave(cpu);
+ break;
+
+ case 'R':
+ set_tsk_need_resched(current);
+ break;
+
+ case 'S':
+ printk("CPU#%d stopping\n", cpu);
+ while(1)
+ pause();
+ break;
+
+ default:
+ printk("CPU#%d received unknown IPI [%c]!\n", cpu, c);
+ break;
+ }
+ }
+}
+
+int hard_smp_processor_id(void)
+{
+ return(pid_to_processor_id(os_getpid()));
+}
+
+static DEFINE_SPINLOCK(call_lock);
+static atomic_t scf_started;
+static atomic_t scf_finished;
+static void (*func)(void *info);
+static void *info;
+
+void smp_call_function_slave(int cpu)
+{
+ atomic_inc(&scf_started);
+ (*func)(info);
+ atomic_inc(&scf_finished);
+}
+
+int smp_call_function(void (*_func)(void *info), void *_info, int nonatomic,
+ int wait)
+{
+ int cpus = num_online_cpus() - 1;
+ int i;
+
+ if (!cpus)
+ return 0;
+
+ /* Can deadlock when called with interrupts disabled */
+ WARN_ON(irqs_disabled());
+
+ spin_lock_bh(&call_lock);
+ atomic_set(&scf_started, 0);
+ atomic_set(&scf_finished, 0);
+ func = _func;
+ info = _info;
+
+ for_each_online_cpu(i)
+ os_write_file(cpu_data[i].ipi_pipe[1], "C", 1);
+
+ while (atomic_read(&scf_started) != cpus)
+ barrier();
+
+ if (wait)
+ while (atomic_read(&scf_finished) != cpus)
+ barrier();
+
+ spin_unlock_bh(&call_lock);
+ return 0;
+}
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/sys_call_table.c b/arch/um/kernel/sys_call_table.c
new file mode 100644
index 0000000..7fc06c8
--- /dev/null
+++ b/arch/um/kernel/sys_call_table.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/unistd.h"
+#include "linux/sys.h"
+#include "linux/swap.h"
+#include "linux/syscalls.h"
+#include "linux/sysctl.h"
+#include "asm/signal.h"
+#include "sysdep/syscalls.h"
+#include "kern_util.h"
+
+#ifdef CONFIG_NFSD
+#define NFSSERVCTL sys_nfsservctl
+#else
+#define NFSSERVCTL sys_ni_syscall
+#endif
+
+#define LAST_GENERIC_SYSCALL __NR_keyctl
+
+#if LAST_GENERIC_SYSCALL > LAST_ARCH_SYSCALL
+#define LAST_SYSCALL LAST_GENERIC_SYSCALL
+#else
+#define LAST_SYSCALL LAST_ARCH_SYSCALL
+#endif
+
+extern syscall_handler_t sys_fork;
+extern syscall_handler_t sys_execve;
+extern syscall_handler_t um_time;
+extern syscall_handler_t um_stime;
+extern syscall_handler_t sys_pipe;
+extern syscall_handler_t sys_olduname;
+extern syscall_handler_t sys_sigaction;
+extern syscall_handler_t sys_sigsuspend;
+extern syscall_handler_t old_readdir;
+extern syscall_handler_t sys_uname;
+extern syscall_handler_t sys_ipc;
+extern syscall_handler_t sys_sigreturn;
+extern syscall_handler_t sys_clone;
+extern syscall_handler_t sys_rt_sigreturn;
+extern syscall_handler_t sys_sigaltstack;
+extern syscall_handler_t sys_vfork;
+extern syscall_handler_t old_select;
+extern syscall_handler_t sys_modify_ldt;
+extern syscall_handler_t sys_rt_sigsuspend;
+extern syscall_handler_t sys_mbind;
+extern syscall_handler_t sys_get_mempolicy;
+extern syscall_handler_t sys_set_mempolicy;
+extern syscall_handler_t sys_sys_setaltroot;
+
+syscall_handler_t *sys_call_table[] = {
+ [ __NR_restart_syscall ] = (syscall_handler_t *) sys_restart_syscall,
+ [ __NR_exit ] = (syscall_handler_t *) sys_exit,
+ [ __NR_fork ] = (syscall_handler_t *) sys_fork,
+ [ __NR_read ] = (syscall_handler_t *) sys_read,
+ [ __NR_write ] = (syscall_handler_t *) sys_write,
+
+ /* These three are declared differently in asm/unistd.h */
+ [ __NR_open ] = (syscall_handler_t *) sys_open,
+ [ __NR_close ] = (syscall_handler_t *) sys_close,
+ [ __NR_creat ] = (syscall_handler_t *) sys_creat,
+ [ __NR_link ] = (syscall_handler_t *) sys_link,
+ [ __NR_unlink ] = (syscall_handler_t *) sys_unlink,
+ [ __NR_execve ] = (syscall_handler_t *) sys_execve,
+
+ /* declared differently in kern_util.h */
+ [ __NR_chdir ] = (syscall_handler_t *) sys_chdir,
+ [ __NR_time ] = um_time,
+ [ __NR_mknod ] = (syscall_handler_t *) sys_mknod,
+ [ __NR_chmod ] = (syscall_handler_t *) sys_chmod,
+ [ __NR_lchown ] = (syscall_handler_t *) sys_lchown16,
+ [ __NR_lseek ] = (syscall_handler_t *) sys_lseek,
+ [ __NR_getpid ] = (syscall_handler_t *) sys_getpid,
+ [ __NR_mount ] = (syscall_handler_t *) sys_mount,
+ [ __NR_setuid ] = (syscall_handler_t *) sys_setuid16,
+ [ __NR_getuid ] = (syscall_handler_t *) sys_getuid16,
+ [ __NR_ptrace ] = (syscall_handler_t *) sys_ptrace,
+ [ __NR_alarm ] = (syscall_handler_t *) sys_alarm,
+ [ __NR_pause ] = (syscall_handler_t *) sys_pause,
+ [ __NR_utime ] = (syscall_handler_t *) sys_utime,
+ [ __NR_access ] = (syscall_handler_t *) sys_access,
+ [ __NR_sync ] = (syscall_handler_t *) sys_sync,
+ [ __NR_kill ] = (syscall_handler_t *) sys_kill,
+ [ __NR_rename ] = (syscall_handler_t *) sys_rename,
+ [ __NR_mkdir ] = (syscall_handler_t *) sys_mkdir,
+ [ __NR_rmdir ] = (syscall_handler_t *) sys_rmdir,
+
+ /* Declared differently in asm/unistd.h */
+ [ __NR_dup ] = (syscall_handler_t *) sys_dup,
+ [ __NR_pipe ] = (syscall_handler_t *) sys_pipe,
+ [ __NR_times ] = (syscall_handler_t *) sys_times,
+ [ __NR_brk ] = (syscall_handler_t *) sys_brk,
+ [ __NR_setgid ] = (syscall_handler_t *) sys_setgid16,
+ [ __NR_getgid ] = (syscall_handler_t *) sys_getgid16,
+ [ __NR_geteuid ] = (syscall_handler_t *) sys_geteuid16,
+ [ __NR_getegid ] = (syscall_handler_t *) sys_getegid16,
+ [ __NR_acct ] = (syscall_handler_t *) sys_acct,
+ [ __NR_umount2 ] = (syscall_handler_t *) sys_umount,
+ [ __NR_ioctl ] = (syscall_handler_t *) sys_ioctl,
+ [ __NR_fcntl ] = (syscall_handler_t *) sys_fcntl,
+ [ __NR_setpgid ] = (syscall_handler_t *) sys_setpgid,
+ [ __NR_umask ] = (syscall_handler_t *) sys_umask,
+ [ __NR_chroot ] = (syscall_handler_t *) sys_chroot,
+ [ __NR_ustat ] = (syscall_handler_t *) sys_ustat,
+ [ __NR_dup2 ] = (syscall_handler_t *) sys_dup2,
+ [ __NR_getppid ] = (syscall_handler_t *) sys_getppid,
+ [ __NR_getpgrp ] = (syscall_handler_t *) sys_getpgrp,
+ [ __NR_setsid ] = (syscall_handler_t *) sys_setsid,
+ [ __NR_setreuid ] = (syscall_handler_t *) sys_setreuid16,
+ [ __NR_setregid ] = (syscall_handler_t *) sys_setregid16,
+ [ __NR_sethostname ] = (syscall_handler_t *) sys_sethostname,
+ [ __NR_setrlimit ] = (syscall_handler_t *) sys_setrlimit,
+ [ __NR_getrlimit ] = (syscall_handler_t *) sys_old_getrlimit,
+ [ __NR_getrusage ] = (syscall_handler_t *) sys_getrusage,
+ [ __NR_gettimeofday ] = (syscall_handler_t *) sys_gettimeofday,
+ [ __NR_settimeofday ] = (syscall_handler_t *) sys_settimeofday,
+ [ __NR_getgroups ] = (syscall_handler_t *) sys_getgroups16,
+ [ __NR_setgroups ] = (syscall_handler_t *) sys_setgroups16,
+ [ __NR_symlink ] = (syscall_handler_t *) sys_symlink,
+ [ __NR_readlink ] = (syscall_handler_t *) sys_readlink,
+ [ __NR_uselib ] = (syscall_handler_t *) sys_uselib,
+ [ __NR_swapon ] = (syscall_handler_t *) sys_swapon,
+ [ __NR_reboot ] = (syscall_handler_t *) sys_reboot,
+ [ __NR_munmap ] = (syscall_handler_t *) sys_munmap,
+ [ __NR_truncate ] = (syscall_handler_t *) sys_truncate,
+ [ __NR_ftruncate ] = (syscall_handler_t *) sys_ftruncate,
+ [ __NR_fchmod ] = (syscall_handler_t *) sys_fchmod,
+ [ __NR_fchown ] = (syscall_handler_t *) sys_fchown16,
+ [ __NR_getpriority ] = (syscall_handler_t *) sys_getpriority,
+ [ __NR_setpriority ] = (syscall_handler_t *) sys_setpriority,
+ [ __NR_statfs ] = (syscall_handler_t *) sys_statfs,
+ [ __NR_fstatfs ] = (syscall_handler_t *) sys_fstatfs,
+ [ __NR_ioperm ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_syslog ] = (syscall_handler_t *) sys_syslog,
+ [ __NR_setitimer ] = (syscall_handler_t *) sys_setitimer,
+ [ __NR_getitimer ] = (syscall_handler_t *) sys_getitimer,
+ [ __NR_stat ] = (syscall_handler_t *) sys_newstat,
+ [ __NR_lstat ] = (syscall_handler_t *) sys_newlstat,
+ [ __NR_fstat ] = (syscall_handler_t *) sys_newfstat,
+ [ __NR_vhangup ] = (syscall_handler_t *) sys_vhangup,
+ [ __NR_wait4 ] = (syscall_handler_t *) sys_wait4,
+ [ __NR_swapoff ] = (syscall_handler_t *) sys_swapoff,
+ [ __NR_sysinfo ] = (syscall_handler_t *) sys_sysinfo,
+ [ __NR_fsync ] = (syscall_handler_t *) sys_fsync,
+ [ __NR_clone ] = (syscall_handler_t *) sys_clone,
+ [ __NR_setdomainname ] = (syscall_handler_t *) sys_setdomainname,
+ [ __NR_uname ] = (syscall_handler_t *) sys_newuname,
+ [ __NR_adjtimex ] = (syscall_handler_t *) sys_adjtimex,
+ [ __NR_mprotect ] = (syscall_handler_t *) sys_mprotect,
+ [ __NR_create_module ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_init_module ] = (syscall_handler_t *) sys_init_module,
+ [ __NR_delete_module ] = (syscall_handler_t *) sys_delete_module,
+ [ __NR_get_kernel_syms ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_quotactl ] = (syscall_handler_t *) sys_quotactl,
+ [ __NR_getpgid ] = (syscall_handler_t *) sys_getpgid,
+ [ __NR_fchdir ] = (syscall_handler_t *) sys_fchdir,
+ [ __NR_sysfs ] = (syscall_handler_t *) sys_sysfs,
+ [ __NR_personality ] = (syscall_handler_t *) sys_personality,
+ [ __NR_afs_syscall ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_setfsuid ] = (syscall_handler_t *) sys_setfsuid16,
+ [ __NR_setfsgid ] = (syscall_handler_t *) sys_setfsgid16,
+ [ __NR_getdents ] = (syscall_handler_t *) sys_getdents,
+ [ __NR_flock ] = (syscall_handler_t *) sys_flock,
+ [ __NR_msync ] = (syscall_handler_t *) sys_msync,
+ [ __NR_readv ] = (syscall_handler_t *) sys_readv,
+ [ __NR_writev ] = (syscall_handler_t *) sys_writev,
+ [ __NR_getsid ] = (syscall_handler_t *) sys_getsid,
+ [ __NR_fdatasync ] = (syscall_handler_t *) sys_fdatasync,
+ [ __NR__sysctl ] = (syscall_handler_t *) sys_sysctl,
+ [ __NR_mlock ] = (syscall_handler_t *) sys_mlock,
+ [ __NR_munlock ] = (syscall_handler_t *) sys_munlock,
+ [ __NR_mlockall ] = (syscall_handler_t *) sys_mlockall,
+ [ __NR_munlockall ] = (syscall_handler_t *) sys_munlockall,
+ [ __NR_sched_setparam ] = (syscall_handler_t *) sys_sched_setparam,
+ [ __NR_sched_getparam ] = (syscall_handler_t *) sys_sched_getparam,
+ [ __NR_sched_setscheduler ] = (syscall_handler_t *) sys_sched_setscheduler,
+ [ __NR_sched_getscheduler ] = (syscall_handler_t *) sys_sched_getscheduler,
+ [ __NR_sched_yield ] = (syscall_handler_t *) yield,
+ [ __NR_sched_get_priority_max ] = (syscall_handler_t *) sys_sched_get_priority_max,
+ [ __NR_sched_get_priority_min ] = (syscall_handler_t *) sys_sched_get_priority_min,
+ [ __NR_sched_rr_get_interval ] = (syscall_handler_t *) sys_sched_rr_get_interval,
+ [ __NR_nanosleep ] = (syscall_handler_t *) sys_nanosleep,
+ [ __NR_mremap ] = (syscall_handler_t *) sys_mremap,
+ [ __NR_setresuid ] = (syscall_handler_t *) sys_setresuid16,
+ [ __NR_getresuid ] = (syscall_handler_t *) sys_getresuid16,
+ [ __NR_query_module ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_poll ] = (syscall_handler_t *) sys_poll,
+ [ __NR_nfsservctl ] = (syscall_handler_t *) NFSSERVCTL,
+ [ __NR_setresgid ] = (syscall_handler_t *) sys_setresgid16,
+ [ __NR_getresgid ] = (syscall_handler_t *) sys_getresgid16,
+ [ __NR_prctl ] = (syscall_handler_t *) sys_prctl,
+ [ __NR_rt_sigreturn ] = (syscall_handler_t *) sys_rt_sigreturn,
+ [ __NR_rt_sigaction ] = (syscall_handler_t *) sys_rt_sigaction,
+ [ __NR_rt_sigprocmask ] = (syscall_handler_t *) sys_rt_sigprocmask,
+ [ __NR_rt_sigpending ] = (syscall_handler_t *) sys_rt_sigpending,
+ [ __NR_rt_sigtimedwait ] = (syscall_handler_t *) sys_rt_sigtimedwait,
+ [ __NR_rt_sigqueueinfo ] = (syscall_handler_t *) sys_rt_sigqueueinfo,
+ [ __NR_rt_sigsuspend ] = (syscall_handler_t *) sys_rt_sigsuspend,
+ [ __NR_pread64 ] = (syscall_handler_t *) sys_pread64,
+ [ __NR_pwrite64 ] = (syscall_handler_t *) sys_pwrite64,
+ [ __NR_chown ] = (syscall_handler_t *) sys_chown16,
+ [ __NR_getcwd ] = (syscall_handler_t *) sys_getcwd,
+ [ __NR_capget ] = (syscall_handler_t *) sys_capget,
+ [ __NR_capset ] = (syscall_handler_t *) sys_capset,
+ [ __NR_sigaltstack ] = (syscall_handler_t *) sys_sigaltstack,
+ [ __NR_sendfile ] = (syscall_handler_t *) sys_sendfile,
+ [ __NR_getpmsg ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_putpmsg ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_vfork ] = (syscall_handler_t *) sys_vfork,
+ [ __NR_getdents64 ] = (syscall_handler_t *) sys_getdents64,
+ [ __NR_gettid ] = (syscall_handler_t *) sys_gettid,
+ [ __NR_readahead ] = (syscall_handler_t *) sys_readahead,
+ [ __NR_setxattr ] = (syscall_handler_t *) sys_setxattr,
+ [ __NR_lsetxattr ] = (syscall_handler_t *) sys_lsetxattr,
+ [ __NR_fsetxattr ] = (syscall_handler_t *) sys_fsetxattr,
+ [ __NR_getxattr ] = (syscall_handler_t *) sys_getxattr,
+ [ __NR_lgetxattr ] = (syscall_handler_t *) sys_lgetxattr,
+ [ __NR_fgetxattr ] = (syscall_handler_t *) sys_fgetxattr,
+ [ __NR_listxattr ] = (syscall_handler_t *) sys_listxattr,
+ [ __NR_llistxattr ] = (syscall_handler_t *) sys_llistxattr,
+ [ __NR_flistxattr ] = (syscall_handler_t *) sys_flistxattr,
+ [ __NR_removexattr ] = (syscall_handler_t *) sys_removexattr,
+ [ __NR_lremovexattr ] = (syscall_handler_t *) sys_lremovexattr,
+ [ __NR_fremovexattr ] = (syscall_handler_t *) sys_fremovexattr,
+ [ __NR_tkill ] = (syscall_handler_t *) sys_tkill,
+ [ __NR_futex ] = (syscall_handler_t *) sys_futex,
+ [ __NR_sched_setaffinity ] = (syscall_handler_t *) sys_sched_setaffinity,
+ [ __NR_sched_getaffinity ] = (syscall_handler_t *) sys_sched_getaffinity,
+ [ __NR_io_setup ] = (syscall_handler_t *) sys_io_setup,
+ [ __NR_io_destroy ] = (syscall_handler_t *) sys_io_destroy,
+ [ __NR_io_getevents ] = (syscall_handler_t *) sys_io_getevents,
+ [ __NR_io_submit ] = (syscall_handler_t *) sys_io_submit,
+ [ __NR_io_cancel ] = (syscall_handler_t *) sys_io_cancel,
+ [ __NR_exit_group ] = (syscall_handler_t *) sys_exit_group,
+ [ __NR_lookup_dcookie ] = (syscall_handler_t *) sys_lookup_dcookie,
+ [ __NR_epoll_create ] = (syscall_handler_t *) sys_epoll_create,
+ [ __NR_epoll_ctl ] = (syscall_handler_t *) sys_epoll_ctl,
+ [ __NR_epoll_wait ] = (syscall_handler_t *) sys_epoll_wait,
+ [ __NR_remap_file_pages ] = (syscall_handler_t *) sys_remap_file_pages,
+ [ __NR_set_tid_address ] = (syscall_handler_t *) sys_set_tid_address,
+ [ __NR_timer_create ] = (syscall_handler_t *) sys_timer_create,
+ [ __NR_timer_settime ] = (syscall_handler_t *) sys_timer_settime,
+ [ __NR_timer_gettime ] = (syscall_handler_t *) sys_timer_gettime,
+ [ __NR_timer_getoverrun ] = (syscall_handler_t *) sys_timer_getoverrun,
+ [ __NR_timer_delete ] = (syscall_handler_t *) sys_timer_delete,
+ [ __NR_clock_settime ] = (syscall_handler_t *) sys_clock_settime,
+ [ __NR_clock_gettime ] = (syscall_handler_t *) sys_clock_gettime,
+ [ __NR_clock_getres ] = (syscall_handler_t *) sys_clock_getres,
+ [ __NR_clock_nanosleep ] = (syscall_handler_t *) sys_clock_nanosleep,
+ [ __NR_tgkill ] = (syscall_handler_t *) sys_tgkill,
+ [ __NR_utimes ] = (syscall_handler_t *) sys_utimes,
+ [ __NR_fadvise64 ] = (syscall_handler_t *) sys_fadvise64,
+ [ __NR_vserver ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_mbind ] = (syscall_handler_t *) sys_mbind,
+ [ __NR_get_mempolicy ] = (syscall_handler_t *) sys_get_mempolicy,
+ [ __NR_set_mempolicy ] = (syscall_handler_t *) sys_set_mempolicy,
+ [ __NR_mq_open ] = (syscall_handler_t *) sys_mq_open,
+ [ __NR_mq_unlink ] = (syscall_handler_t *) sys_mq_unlink,
+ [ __NR_mq_timedsend ] = (syscall_handler_t *) sys_mq_timedsend,
+ [ __NR_mq_timedreceive ] = (syscall_handler_t *) sys_mq_timedreceive,
+ [ __NR_mq_notify ] = (syscall_handler_t *) sys_mq_notify,
+ [ __NR_mq_getsetattr ] = (syscall_handler_t *) sys_mq_getsetattr,
+ [ __NR_kexec_load ] = (syscall_handler_t *) sys_ni_syscall,
+ [ __NR_waitid ] = (syscall_handler_t *) sys_waitid,
+ [ __NR_add_key ] = (syscall_handler_t *) sys_add_key,
+ [ __NR_request_key ] = (syscall_handler_t *) sys_request_key,
+ [ __NR_keyctl ] = (syscall_handler_t *) sys_keyctl,
+
+ ARCH_SYSCALLS
+ [ LAST_SYSCALL + 1 ... NR_syscalls ] =
+ (syscall_handler_t *) sys_ni_syscall
+};
diff --git a/arch/um/kernel/syscall_kern.c b/arch/um/kernel/syscall_kern.c
new file mode 100644
index 0000000..42731e0
--- /dev/null
+++ b/arch/um/kernel/syscall_kern.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/file.h"
+#include "linux/smp_lock.h"
+#include "linux/mm.h"
+#include "linux/utsname.h"
+#include "linux/msg.h"
+#include "linux/shm.h"
+#include "linux/sys.h"
+#include "linux/syscalls.h"
+#include "linux/unistd.h"
+#include "linux/slab.h"
+#include "linux/utime.h"
+#include "asm/mman.h"
+#include "asm/uaccess.h"
+#include "asm/ipc.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "sysdep/syscalls.h"
+#include "mode_kern.h"
+#include "choose-mode.h"
+
+/* Unlocked, I don't care if this is a bit off */
+int nsyscalls = 0;
+
+long sys_fork(void)
+{
+ long ret;
+
+ current->thread.forking = 1;
+ ret = do_fork(SIGCHLD, 0, NULL, 0, NULL, NULL);
+ current->thread.forking = 0;
+ return(ret);
+}
+
+long sys_vfork(void)
+{
+ long ret;
+
+ current->thread.forking = 1;
+ ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, NULL, 0, NULL,
+ NULL);
+ current->thread.forking = 0;
+ return(ret);
+}
+
+/* common code for old and new mmaps */
+long sys_mmap2(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long pgoff)
+{
+ long error = -EBADF;
+ struct file * file = NULL;
+
+ flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+ if (!(flags & MAP_ANONYMOUS)) {
+ file = fget(fd);
+ if (!file)
+ goto out;
+ }
+
+ down_write(¤t->mm->mmap_sem);
+ error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ up_write(¤t->mm->mmap_sem);
+
+ if (file)
+ fput(file);
+ out:
+ return error;
+}
+
+long old_mmap(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long offset)
+{
+ long err = -EINVAL;
+ if (offset & ~PAGE_MASK)
+ goto out;
+
+ err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+ out:
+ return err;
+}
+/*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way unix traditionally does this, though.
+ */
+long sys_pipe(unsigned long __user * fildes)
+{
+ int fd[2];
+ long error;
+
+ error = do_pipe(fd);
+ if (!error) {
+ if (copy_to_user(fildes, fd, sizeof(fd)))
+ error = -EFAULT;
+ }
+ return error;
+}
+
+
+long sys_uname(struct old_utsname * name)
+{
+ long err;
+ if (!name)
+ return -EFAULT;
+ down_read(&uts_sem);
+ err=copy_to_user(name, &system_utsname, sizeof (*name));
+ up_read(&uts_sem);
+ return err?-EFAULT:0;
+}
+
+long sys_olduname(struct oldold_utsname * name)
+{
+ long error;
+
+ if (!name)
+ return -EFAULT;
+ if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
+ return -EFAULT;
+
+ down_read(&uts_sem);
+
+ error = __copy_to_user(&name->sysname,&system_utsname.sysname,
+ __OLD_UTS_LEN);
+ error |= __put_user(0,name->sysname+__OLD_UTS_LEN);
+ error |= __copy_to_user(&name->nodename,&system_utsname.nodename,
+ __OLD_UTS_LEN);
+ error |= __put_user(0,name->nodename+__OLD_UTS_LEN);
+ error |= __copy_to_user(&name->release,&system_utsname.release,
+ __OLD_UTS_LEN);
+ error |= __put_user(0,name->release+__OLD_UTS_LEN);
+ error |= __copy_to_user(&name->version,&system_utsname.version,
+ __OLD_UTS_LEN);
+ error |= __put_user(0,name->version+__OLD_UTS_LEN);
+ error |= __copy_to_user(&name->machine,&system_utsname.machine,
+ __OLD_UTS_LEN);
+ error |= __put_user(0,name->machine+__OLD_UTS_LEN);
+
+ up_read(&uts_sem);
+
+ error = error ? -EFAULT : 0;
+
+ return error;
+}
+
+DEFINE_SPINLOCK(syscall_lock);
+
+static int syscall_index = 0;
+
+int next_syscall_index(int limit)
+{
+ int ret;
+
+ spin_lock(&syscall_lock);
+ ret = syscall_index;
+ if(++syscall_index == limit)
+ syscall_index = 0;
+ spin_unlock(&syscall_lock);
+ return(ret);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/syscall_user.c b/arch/um/kernel/syscall_user.c
new file mode 100644
index 0000000..01b711e
--- /dev/null
+++ b/arch/um/kernel/syscall_user.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <sys/time.h>
+#include "kern_util.h"
+#include "syscall_user.h"
+
+struct {
+ int syscall;
+ int pid;
+ long result;
+ struct timeval start;
+ struct timeval end;
+} syscall_record[1024];
+
+int record_syscall_start(int syscall)
+{
+ int max, index;
+
+ max = sizeof(syscall_record)/sizeof(syscall_record[0]);
+ index = next_syscall_index(max);
+
+ syscall_record[index].syscall = syscall;
+ syscall_record[index].pid = current_pid();
+ syscall_record[index].result = 0xdeadbeef;
+ gettimeofday(&syscall_record[index].start, NULL);
+ return(index);
+}
+
+void record_syscall_end(int index, long result)
+{
+ syscall_record[index].result = result;
+ gettimeofday(&syscall_record[index].end, NULL);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
new file mode 100644
index 0000000..e630438
--- /dev/null
+++ b/arch/um/kernel/sysrq.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/kernel.h"
+#include "linux/module.h"
+#include "linux/kallsyms.h"
+#include "asm/page.h"
+#include "asm/processor.h"
+#include "sysrq.h"
+#include "user_util.h"
+
+void show_trace(unsigned long * stack)
+{
+ /* XXX: Copy the CONFIG_FRAME_POINTER stack-walking backtrace from
+ * arch/i386/kernel/traps.c, and then move this to sys-i386/sysrq.c.*/
+ unsigned long addr;
+
+ if (!stack) {
+ stack = (unsigned long*) &stack;
+ WARN_ON(1);
+ }
+
+ printk("Call Trace: \n");
+ while (((long) stack & (THREAD_SIZE-1)) != 0) {
+ addr = *stack;
+ if (__kernel_text_address(addr)) {
+ printk("%08lx: [<%08lx>]", (unsigned long) stack, addr);
+ print_symbol(" %s", addr);
+ printk("\n");
+ }
+ stack++;
+ }
+ printk("\n");
+}
+
+/*
+ * stack dumps generator - this is used by arch-independent code.
+ * And this is identical to i386 currently.
+ */
+void dump_stack(void)
+{
+ unsigned long stack;
+
+ show_trace(&stack);
+}
+EXPORT_SYMBOL(dump_stack);
+
+/*Stolen from arch/i386/kernel/traps.c */
+static int kstack_depth_to_print = 24;
+
+/* This recently started being used in arch-independent code too, as in
+ * kernel/sched.c.*/
+void show_stack(struct task_struct *task, unsigned long *esp)
+{
+ unsigned long *stack;
+ int i;
+
+ if (esp == NULL) {
+ if (task != current) {
+ esp = (unsigned long *) KSTK_ESP(task);
+ /* Which one? No actual difference - just coding style.*/
+ //esp = (unsigned long *) PT_REGS_IP(&task->thread.regs);
+ } else {
+ esp = (unsigned long *) &esp;
+ }
+ }
+
+ stack = esp;
+ for(i = 0; i < kstack_depth_to_print; i++) {
+ if (kstack_end(stack))
+ break;
+ if (i && ((i % 8) == 0))
+ printk("\n ");
+ printk("%08lx ", *stack++);
+ }
+
+ show_trace(esp);
+}
diff --git a/arch/um/kernel/tempfile.c b/arch/um/kernel/tempfile.c
new file mode 100644
index 0000000..b1674bc
--- /dev/null
+++ b/arch/um/kernel/tempfile.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/param.h>
+#include "init.h"
+
+/* Modified from create_mem_file and start_debugger */
+static char *tempdir = NULL;
+
+static void __init find_tempdir(void)
+{
+ char *dirs[] = { "TMP", "TEMP", "TMPDIR", NULL };
+ int i;
+ char *dir = NULL;
+
+ if(tempdir != NULL) return; /* We've already been called */
+ for(i = 0; dirs[i]; i++){
+ dir = getenv(dirs[i]);
+ if((dir != NULL) && (*dir != '\0'))
+ break;
+ }
+ if((dir == NULL) || (*dir == '\0'))
+ dir = "/tmp";
+
+ tempdir = malloc(strlen(dir) + 2);
+ if(tempdir == NULL){
+ fprintf(stderr, "Failed to malloc tempdir, "
+ "errno = %d\n", errno);
+ return;
+ }
+ strcpy(tempdir, dir);
+ strcat(tempdir, "/");
+}
+
+int make_tempfile(const char *template, char **out_tempname, int do_unlink)
+{
+ char tempname[MAXPATHLEN];
+ int fd;
+
+ find_tempdir();
+ if (*template != '/')
+ strcpy(tempname, tempdir);
+ else
+ *tempname = 0;
+ strcat(tempname, template);
+ fd = mkstemp(tempname);
+ if(fd < 0){
+ fprintf(stderr, "open - cannot create %s: %s\n", tempname,
+ strerror(errno));
+ return -1;
+ }
+ if(do_unlink && (unlink(tempname) < 0)){
+ perror("unlink");
+ return -1;
+ }
+ if(out_tempname){
+ *out_tempname = strdup(tempname);
+ if(*out_tempname == NULL){
+ perror("strdup");
+ return -1;
+ }
+ }
+ return(fd);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
new file mode 100644
index 0000000..c40c86a
--- /dev/null
+++ b/arch/um/kernel/time.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <errno.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "process.h"
+#include "signal_user.h"
+#include "time_user.h"
+#include "kern_constants.h"
+
+/* XXX This really needs to be declared and initialized in a kernel file since
+ * it's in <linux/time.h>
+ */
+extern struct timespec wall_to_monotonic;
+
+extern struct timeval xtime;
+
+struct timeval local_offset = { 0, 0 };
+
+void timer(void)
+{
+ gettimeofday(&xtime, NULL);
+ timeradd(&xtime, &local_offset, &xtime);
+}
+
+void set_interval(int timer_type)
+{
+ int usec = 1000000/hz();
+ struct itimerval interval = ((struct itimerval) { { 0, usec },
+ { 0, usec } });
+
+ if(setitimer(timer_type, &interval, NULL) == -1)
+ panic("setitimer failed - errno = %d\n", errno);
+}
+
+void enable_timer(void)
+{
+ int usec = 1000000/hz();
+ struct itimerval enable = ((struct itimerval) { { 0, usec },
+ { 0, usec }});
+ if(setitimer(ITIMER_VIRTUAL, &enable, NULL))
+ printk("enable_timer - setitimer failed, errno = %d\n",
+ errno);
+}
+
+void disable_timer(void)
+{
+ struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
+ if((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) ||
+ (setitimer(ITIMER_REAL, &disable, NULL) < 0))
+ printk("disnable_timer - setitimer failed, errno = %d\n",
+ errno);
+ /* If there are signals already queued, after unblocking ignore them */
+ set_handler(SIGALRM, SIG_IGN, 0, -1);
+ set_handler(SIGVTALRM, SIG_IGN, 0, -1);
+}
+
+void switch_timers(int to_real)
+{
+ struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
+ struct itimerval enable = ((struct itimerval) { { 0, 1000000/hz() },
+ { 0, 1000000/hz() }});
+ int old, new;
+
+ if(to_real){
+ old = ITIMER_VIRTUAL;
+ new = ITIMER_REAL;
+ }
+ else {
+ old = ITIMER_REAL;
+ new = ITIMER_VIRTUAL;
+ }
+
+ if((setitimer(old, &disable, NULL) < 0) ||
+ (setitimer(new, &enable, NULL)))
+ printk("switch_timers - setitimer failed, errno = %d\n",
+ errno);
+}
+
+void uml_idle_timer(void)
+{
+ if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
+ panic("Couldn't unset SIGVTALRM handler");
+
+ set_handler(SIGALRM, (__sighandler_t) alarm_handler,
+ SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
+ set_interval(ITIMER_REAL);
+}
+
+extern int do_posix_clock_monotonic_gettime(struct timespec *tp);
+
+void time_init(void)
+{
+ struct timespec now;
+
+ if(signal(SIGVTALRM, boot_timer_handler) == SIG_ERR)
+ panic("Couldn't set SIGVTALRM handler");
+ set_interval(ITIMER_VIRTUAL);
+
+ do_posix_clock_monotonic_gettime(&now);
+ wall_to_monotonic.tv_sec = -now.tv_sec;
+ wall_to_monotonic.tv_nsec = -now.tv_nsec;
+}
+
+/* Declared in linux/time.h, which can't be included here */
+extern void clock_was_set(void);
+
+void do_gettimeofday(struct timeval *tv)
+{
+ unsigned long flags;
+
+ flags = time_lock();
+ gettimeofday(tv, NULL);
+ timeradd(tv, &local_offset, tv);
+ time_unlock(flags);
+ clock_was_set();
+}
+
+int do_settimeofday(struct timespec *tv)
+{
+ struct timeval now;
+ unsigned long flags;
+ struct timeval tv_in;
+
+ if ((unsigned long) tv->tv_nsec >= UM_NSEC_PER_SEC)
+ return -EINVAL;
+
+ tv_in.tv_sec = tv->tv_sec;
+ tv_in.tv_usec = tv->tv_nsec / 1000;
+
+ flags = time_lock();
+ gettimeofday(&now, NULL);
+ timersub(&tv_in, &now, &local_offset);
+ time_unlock(flags);
+
+ return(0);
+}
+
+void idle_sleep(int secs)
+{
+ struct timespec ts;
+
+ ts.tv_sec = secs;
+ ts.tv_nsec = 0;
+ nanosleep(&ts, NULL);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/time_kern.c b/arch/um/kernel/time_kern.c
new file mode 100644
index 0000000..2461cd7
--- /dev/null
+++ b/arch/um/kernel/time_kern.c
@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/module.h"
+#include "linux/unistd.h"
+#include "linux/stddef.h"
+#include "linux/spinlock.h"
+#include "linux/time.h"
+#include "linux/sched.h"
+#include "linux/interrupt.h"
+#include "linux/init.h"
+#include "linux/delay.h"
+#include "asm/irq.h"
+#include "asm/param.h"
+#include "asm/current.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "time_user.h"
+#include "mode.h"
+#include "os.h"
+
+u64 jiffies_64 = INITIAL_JIFFIES;
+
+EXPORT_SYMBOL(jiffies_64);
+
+int hz(void)
+{
+ return(HZ);
+}
+
+/*
+ * Scheduler clock - returns current time in nanosec units.
+ */
+unsigned long long sched_clock(void)
+{
+ return (unsigned long long)jiffies_64 * (1000000000 / HZ);
+}
+
+/* Changed at early boot */
+int timer_irq_inited = 0;
+
+static int first_tick;
+static unsigned long long prev_usecs;
+#ifdef CONFIG_UML_REAL_TIME_CLOCK
+static long long delta; /* Deviation per interval */
+#endif
+
+#define MILLION 1000000
+
+void timer_irq(union uml_pt_regs *regs)
+{
+ unsigned long long ticks = 0;
+
+ if(!timer_irq_inited){
+ /* This is to ensure that ticks don't pile up when
+ * the timer handler is suspended */
+ first_tick = 0;
+ return;
+ }
+
+ if(first_tick){
+#ifdef CONFIG_UML_REAL_TIME_CLOCK
+ /* We've had 1 tick */
+ unsigned long long usecs = os_usecs();
+
+ delta += usecs - prev_usecs;
+ prev_usecs = usecs;
+
+ /* Protect against the host clock being set backwards */
+ if(delta < 0)
+ delta = 0;
+
+ ticks += (delta * HZ) / MILLION;
+ delta -= (ticks * MILLION) / HZ;
+#else
+ ticks = 1;
+#endif
+ }
+ else {
+ prev_usecs = os_usecs();
+ first_tick = 1;
+ }
+
+ while(ticks > 0){
+ do_IRQ(TIMER_IRQ, regs);
+ ticks--;
+ }
+}
+
+void boot_timer_handler(int sig)
+{
+ struct pt_regs regs;
+
+ CHOOSE_MODE((void)
+ (UPT_SC(®s.regs) = (struct sigcontext *) (&sig + 1)),
+ (void) (regs.regs.skas.is_user = 0));
+ do_timer(®s);
+}
+
+irqreturn_t um_timer(int irq, void *dev, struct pt_regs *regs)
+{
+ unsigned long flags;
+
+ do_timer(regs);
+ write_seqlock_irqsave(&xtime_lock, flags);
+ timer();
+ write_sequnlock_irqrestore(&xtime_lock, flags);
+ return(IRQ_HANDLED);
+}
+
+long um_time(int __user *tloc)
+{
+ struct timeval now;
+
+ do_gettimeofday(&now);
+ if (tloc) {
+ if (put_user(now.tv_sec, tloc))
+ now.tv_sec = -EFAULT;
+ }
+ return now.tv_sec;
+}
+
+long um_stime(int __user *tptr)
+{
+ int value;
+ struct timespec new;
+
+ if (get_user(value, tptr))
+ return -EFAULT;
+ new.tv_sec = value;
+ new.tv_nsec = 0;
+ do_settimeofday(&new);
+ return 0;
+}
+
+void __udelay(unsigned long usecs)
+{
+ int i, n;
+
+ n = (loops_per_jiffy * HZ * usecs) / MILLION;
+ for(i=0;i<n;i++) ;
+}
+
+void __const_udelay(unsigned long usecs)
+{
+ int i, n;
+
+ n = (loops_per_jiffy * HZ * usecs) / MILLION;
+ for(i=0;i<n;i++) ;
+}
+
+void timer_handler(int sig, union uml_pt_regs *regs)
+{
+ local_irq_disable();
+ update_process_times(CHOOSE_MODE(user_context(UPT_SP(regs)), (regs)->skas.is_user));
+ local_irq_enable();
+ if(current_thread->cpu == 0)
+ timer_irq(regs);
+}
+
+static DEFINE_SPINLOCK(timer_spinlock);
+
+unsigned long time_lock(void)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&timer_spinlock, flags);
+ return(flags);
+}
+
+void time_unlock(unsigned long flags)
+{
+ spin_unlock_irqrestore(&timer_spinlock, flags);
+}
+
+int __init timer_init(void)
+{
+ int err;
+
+ CHOOSE_MODE(user_time_init_tt(), user_time_init_skas());
+ err = request_irq(TIMER_IRQ, um_timer, SA_INTERRUPT, "timer", NULL);
+ if(err != 0)
+ printk(KERN_ERR "timer_init : request_irq failed - "
+ "errno = %d\n", -err);
+ timer_irq_inited = 1;
+ return(0);
+}
+
+__initcall(timer_init);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
new file mode 100644
index 0000000..eda477e
--- /dev/null
+++ b/arch/um/kernel/tlb.c
@@ -0,0 +1,369 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/mm.h"
+#include "asm/page.h"
+#include "asm/pgalloc.h"
+#include "asm/tlbflush.h"
+#include "choose-mode.h"
+#include "mode_kern.h"
+#include "user_util.h"
+#include "tlb.h"
+#include "mem.h"
+#include "mem_user.h"
+#include "os.h"
+
+#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
+
+void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
+ unsigned long end_addr, int force, int data,
+ void (*do_ops)(int, struct host_vm_op *, int))
+{
+ pgd_t *npgd;
+ pud_t *npud;
+ pmd_t *npmd;
+ pte_t *npte;
+ unsigned long addr, end;
+ int r, w, x;
+ struct host_vm_op ops[16];
+ int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;
+
+ if(mm == NULL) return;
+
+ for(addr = start_addr; addr < end_addr;){
+ npgd = pgd_offset(mm, addr);
+ if(!pgd_present(*npgd)){
+ end = ADD_ROUND(addr, PGDIR_SIZE);
+ if(end > end_addr)
+ end = end_addr;
+ if(force || pgd_newpage(*npgd)){
+ op_index = add_munmap(addr, end - addr, ops,
+ op_index, last_op, data,
+ do_ops);
+ pgd_mkuptodate(*npgd);
+ }
+ addr = end;
+ continue;
+ }
+
+ npud = pud_offset(npgd, addr);
+ if(!pud_present(*npud)){
+ end = ADD_ROUND(addr, PUD_SIZE);
+ if(end > end_addr)
+ end = end_addr;
+ if(force || pud_newpage(*npud)){
+ op_index = add_munmap(addr, end - addr, ops,
+ op_index, last_op, data,
+ do_ops);
+ pud_mkuptodate(*npud);
+ }
+ addr = end;
+ continue;
+ }
+
+ npmd = pmd_offset(npud, addr);
+ if(!pmd_present(*npmd)){
+ end = ADD_ROUND(addr, PMD_SIZE);
+ if(end > end_addr)
+ end = end_addr;
+ if(force || pmd_newpage(*npmd)){
+ op_index = add_munmap(addr, end - addr, ops,
+ op_index, last_op, data,
+ do_ops);
+ pmd_mkuptodate(*npmd);
+ }
+ addr = end;
+ continue;
+ }
+
+ npte = pte_offset_kernel(npmd, addr);
+ r = pte_read(*npte);
+ w = pte_write(*npte);
+ x = pte_exec(*npte);
+ if(!pte_dirty(*npte))
+ w = 0;
+ if(!pte_young(*npte)){
+ r = 0;
+ w = 0;
+ }
+ if(force || pte_newpage(*npte)){
+ if(pte_present(*npte))
+ op_index = add_mmap(addr,
+ pte_val(*npte) & PAGE_MASK,
+ PAGE_SIZE, r, w, x, ops,
+ op_index, last_op, data,
+ do_ops);
+ else op_index = add_munmap(addr, PAGE_SIZE, ops,
+ op_index, last_op, data,
+ do_ops);
+ }
+ else if(pte_newprot(*npte))
+ op_index = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
+ op_index, last_op, data,
+ do_ops);
+
+ *npte = pte_mkuptodate(*npte);
+ addr += PAGE_SIZE;
+ }
+ (*do_ops)(data, ops, op_index);
+}
+
+int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
+{
+ struct mm_struct *mm;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long addr, last;
+ int updated = 0, err;
+
+ mm = &init_mm;
+ for(addr = start; addr < end;){
+ pgd = pgd_offset(mm, addr);
+ if(!pgd_present(*pgd)){
+ last = ADD_ROUND(addr, PGDIR_SIZE);
+ if(last > end)
+ last = end;
+ if(pgd_newpage(*pgd)){
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ last - addr);
+ if(err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ }
+ addr = last;
+ continue;
+ }
+
+ pud = pud_offset(pgd, addr);
+ if(!pud_present(*pud)){
+ last = ADD_ROUND(addr, PUD_SIZE);
+ if(last > end)
+ last = end;
+ if(pud_newpage(*pud)){
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ last - addr);
+ if(err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ }
+ addr = last;
+ continue;
+ }
+
+ pmd = pmd_offset(pud, addr);
+ if(!pmd_present(*pmd)){
+ last = ADD_ROUND(addr, PMD_SIZE);
+ if(last > end)
+ last = end;
+ if(pmd_newpage(*pmd)){
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ last - addr);
+ if(err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ }
+ addr = last;
+ continue;
+ }
+
+ pte = pte_offset_kernel(pmd, addr);
+ if(!pte_present(*pte) || pte_newpage(*pte)){
+ updated = 1;
+ err = os_unmap_memory((void *) addr,
+ PAGE_SIZE);
+ if(err < 0)
+ panic("munmap failed, errno = %d\n",
+ -err);
+ if(pte_present(*pte))
+ map_memory(addr,
+ pte_val(*pte) & PAGE_MASK,
+ PAGE_SIZE, 1, 1, 1);
+ }
+ else if(pte_newprot(*pte)){
+ updated = 1;
+ protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
+ }
+ addr += PAGE_SIZE;
+ }
+ return(updated);
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
+{
+ address &= PAGE_MASK;
+ flush_tlb_range(vma, address, address + PAGE_SIZE);
+}
+
+void flush_tlb_all(void)
+{
+ flush_tlb_mm(current->mm);
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt,
+ flush_tlb_kernel_range_common, start, end);
+}
+
+void flush_tlb_kernel_vm(void)
+{
+ CHOOSE_MODE(flush_tlb_kernel_vm_tt(),
+ flush_tlb_kernel_range_common(start_vm, end_vm));
+}
+
+void __flush_tlb_one(unsigned long addr)
+{
+ CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr);
+}
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start,
+ end);
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+ CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm);
+}
+
+void force_flush_all(void)
+{
+ CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas());
+}
+
+pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
+{
+ return(pgd_offset(mm, address));
+}
+
+pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
+{
+ return(pud_offset(pgd, address));
+}
+
+pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
+{
+ return(pmd_offset(pud, address));
+}
+
+pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
+{
+ return(pte_offset_kernel(pmd, address));
+}
+
+pte_t *addr_pte(struct task_struct *task, unsigned long addr)
+{
+ pgd_t *pgd = pgd_offset(task->mm, addr);
+ pud_t *pud = pud_offset(pgd, addr);
+ pmd_t *pmd = pmd_offset(pud, addr);
+
+ return(pte_offset_map(pmd, addr));
+}
+
+int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
+ int r, int w, int x, struct host_vm_op *ops, int index,
+ int last_filled, int data,
+ void (*do_ops)(int, struct host_vm_op *, int))
+{
+ __u64 offset;
+ struct host_vm_op *last;
+ int fd;
+
+ fd = phys_mapping(phys, &offset);
+ if(index != -1){
+ last = &ops[index];
+ if((last->type == MMAP) &&
+ (last->u.mmap.addr + last->u.mmap.len == virt) &&
+ (last->u.mmap.r == r) && (last->u.mmap.w == w) &&
+ (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
+ (last->u.mmap.offset + last->u.mmap.len == offset)){
+ last->u.mmap.len += len;
+ return(index);
+ }
+ }
+
+ if(index == last_filled){
+ (*do_ops)(data, ops, last_filled);
+ index = -1;
+ }
+
+ ops[++index] = ((struct host_vm_op) { .type = MMAP,
+ .u = { .mmap = {
+ .addr = virt,
+ .len = len,
+ .r = r,
+ .w = w,
+ .x = x,
+ .fd = fd,
+ .offset = offset }
+ } });
+ return(index);
+}
+
+int add_munmap(unsigned long addr, unsigned long len, struct host_vm_op *ops,
+ int index, int last_filled, int data,
+ void (*do_ops)(int, struct host_vm_op *, int))
+{
+ struct host_vm_op *last;
+
+ if(index != -1){
+ last = &ops[index];
+ if((last->type == MUNMAP) &&
+ (last->u.munmap.addr + last->u.mmap.len == addr)){
+ last->u.munmap.len += len;
+ return(index);
+ }
+ }
+
+ if(index == last_filled){
+ (*do_ops)(data, ops, last_filled);
+ index = -1;
+ }
+
+ ops[++index] = ((struct host_vm_op) { .type = MUNMAP,
+ .u = { .munmap = {
+ .addr = addr,
+ .len = len } } });
+ return(index);
+}
+
+int add_mprotect(unsigned long addr, unsigned long len, int r, int w, int x,
+ struct host_vm_op *ops, int index, int last_filled, int data,
+ void (*do_ops)(int, struct host_vm_op *, int))
+{
+ struct host_vm_op *last;
+
+ if(index != -1){
+ last = &ops[index];
+ if((last->type == MPROTECT) &&
+ (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
+ (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
+ (last->u.mprotect.x == x)){
+ last->u.mprotect.len += len;
+ return(index);
+ }
+ }
+
+ if(index == last_filled){
+ (*do_ops)(data, ops, last_filled);
+ index = -1;
+ }
+
+ ops[++index] = ((struct host_vm_op) { .type = MPROTECT,
+ .u = { .mprotect = {
+ .addr = addr,
+ .len = len,
+ .r = r,
+ .w = w,
+ .x = x } } });
+ return(index);
+}
diff --git a/arch/um/kernel/trap_kern.c b/arch/um/kernel/trap_kern.c
new file mode 100644
index 0000000..47e766e
--- /dev/null
+++ b/arch/um/kernel/trap_kern.c
@@ -0,0 +1,251 @@
+/*
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "asm/errno.h"
+#include "linux/sched.h"
+#include "linux/mm.h"
+#include "linux/spinlock.h"
+#include "linux/config.h"
+#include "linux/init.h"
+#include "linux/ptrace.h"
+#include "asm/semaphore.h"
+#include "asm/pgtable.h"
+#include "asm/pgalloc.h"
+#include "asm/tlbflush.h"
+#include "asm/a.out.h"
+#include "asm/current.h"
+#include "asm/irq.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "chan_kern.h"
+#include "mconsole_kern.h"
+#include "2_5compat.h"
+#include "mem.h"
+#include "mem_kern.h"
+
+int handle_page_fault(unsigned long address, unsigned long ip,
+ int is_write, int is_user, int *code_out)
+{
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long page;
+ int err = -EFAULT;
+
+ *code_out = SEGV_MAPERR;
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, address);
+ if(!vma)
+ goto out;
+ else if(vma->vm_start <= address)
+ goto good_area;
+ else if(!(vma->vm_flags & VM_GROWSDOWN))
+ goto out;
+ else if(!ARCH_IS_STACKGROW(address))
+ goto out;
+ else if(expand_stack(vma, address))
+ goto out;
+
+ good_area:
+ *code_out = SEGV_ACCERR;
+ if(is_write && !(vma->vm_flags & VM_WRITE))
+ goto out;
+ page = address & PAGE_MASK;
+ pgd = pgd_offset(mm, page);
+ pud = pud_offset(pgd, page);
+ pmd = pmd_offset(pud, page);
+ do {
+ survive:
+ switch (handle_mm_fault(mm, vma, address, is_write)){
+ case VM_FAULT_MINOR:
+ current->min_flt++;
+ break;
+ case VM_FAULT_MAJOR:
+ current->maj_flt++;
+ break;
+ case VM_FAULT_SIGBUS:
+ err = -EACCES;
+ goto out;
+ case VM_FAULT_OOM:
+ err = -ENOMEM;
+ goto out_of_memory;
+ default:
+ BUG();
+ }
+ pgd = pgd_offset(mm, page);
+ pud = pud_offset(pgd, page);
+ pmd = pmd_offset(pud, page);
+ pte = pte_offset_kernel(pmd, page);
+ } while(!pte_present(*pte));
+ err = 0;
+ *pte = pte_mkyoung(*pte);
+ if(pte_write(*pte)) *pte = pte_mkdirty(*pte);
+ flush_tlb_page(vma, page);
+ out:
+ up_read(&mm->mmap_sem);
+ return(err);
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+out_of_memory:
+ if (current->pid == 1) {
+ up_read(&mm->mmap_sem);
+ yield();
+ down_read(&mm->mmap_sem);
+ goto survive;
+ }
+ goto out;
+}
+
+LIST_HEAD(physmem_remappers);
+
+void register_remapper(struct remapper *info)
+{
+ list_add(&info->list, &physmem_remappers);
+}
+
+static int check_remapped_addr(unsigned long address, int is_write)
+{
+ struct remapper *remapper;
+ struct list_head *ele;
+ __u64 offset;
+ int fd;
+
+ fd = phys_mapping(__pa(address), &offset);
+ if(fd == -1)
+ return(0);
+
+ list_for_each(ele, &physmem_remappers){
+ remapper = list_entry(ele, struct remapper, list);
+ if((*remapper->proc)(fd, address, is_write, offset))
+ return(1);
+ }
+
+ return(0);
+}
+
+unsigned long segv(unsigned long address, unsigned long ip, int is_write,
+ int is_user, void *sc)
+{
+ struct siginfo si;
+ void *catcher;
+ int err;
+
+ if(!is_user && (address >= start_vm) && (address < end_vm)){
+ flush_tlb_kernel_vm();
+ return(0);
+ }
+ else if(check_remapped_addr(address & PAGE_MASK, is_write))
+ return(0);
+ else if(current->mm == NULL)
+ panic("Segfault with no mm");
+ err = handle_page_fault(address, ip, is_write, is_user, &si.si_code);
+
+ catcher = current->thread.fault_catcher;
+ if(!err)
+ return(0);
+ else if(catcher != NULL){
+ current->thread.fault_addr = (void *) address;
+ do_longjmp(catcher, 1);
+ }
+ else if(current->thread.fault_addr != NULL)
+ panic("fault_addr set but no fault catcher");
+ else if(arch_fixup(ip, sc))
+ return(0);
+
+ if(!is_user)
+ panic("Kernel mode fault at addr 0x%lx, ip 0x%lx",
+ address, ip);
+
+ if(err == -EACCES){
+ si.si_signo = SIGBUS;
+ si.si_errno = 0;
+ si.si_code = BUS_ADRERR;
+ si.si_addr = (void *)address;
+ force_sig_info(SIGBUS, &si, current);
+ }
+ else if(err == -ENOMEM){
+ printk("VM: killing process %s\n", current->comm);
+ do_exit(SIGKILL);
+ }
+ else {
+ si.si_signo = SIGSEGV;
+ si.si_addr = (void *) address;
+ current->thread.cr2 = address;
+ current->thread.err = is_write;
+ force_sig_info(SIGSEGV, &si, current);
+ }
+ return(0);
+}
+
+void bad_segv(unsigned long address, unsigned long ip, int is_write)
+{
+ struct siginfo si;
+
+ si.si_signo = SIGSEGV;
+ si.si_code = SEGV_ACCERR;
+ si.si_addr = (void *) address;
+ current->thread.cr2 = address;
+ current->thread.err = is_write;
+ force_sig_info(SIGSEGV, &si, current);
+}
+
+void relay_signal(int sig, union uml_pt_regs *regs)
+{
+ if(arch_handle_signal(sig, regs)) return;
+ if(!UPT_IS_USER(regs))
+ panic("Kernel mode signal %d", sig);
+ force_sig(sig, current);
+}
+
+void bus_handler(int sig, union uml_pt_regs *regs)
+{
+ if(current->thread.fault_catcher != NULL)
+ do_longjmp(current->thread.fault_catcher, 1);
+ else relay_signal(sig, regs);
+}
+
+void winch(int sig, union uml_pt_regs *regs)
+{
+ do_IRQ(WINCH_IRQ, regs);
+}
+
+void trap_init(void)
+{
+}
+
+DEFINE_SPINLOCK(trap_lock);
+
+static int trap_index = 0;
+
+int next_trap_index(int limit)
+{
+ int ret;
+
+ spin_lock(&trap_lock);
+ ret = trap_index;
+ if(++trap_index == limit)
+ trap_index = 0;
+ spin_unlock(&trap_lock);
+ return(ret);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/trap_user.c b/arch/um/kernel/trap_user.c
new file mode 100644
index 0000000..50a4042
--- /dev/null
+++ b/arch/um/kernel/trap_user.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <asm/page.h>
+#include <asm/unistd.h>
+#include <asm/ptrace.h>
+#include "init.h"
+#include "sysdep/ptrace.h"
+#include "sigcontext.h"
+#include "sysdep/sigcontext.h"
+#include "irq_user.h"
+#include "signal_user.h"
+#include "time_user.h"
+#include "task.h"
+#include "mode.h"
+#include "choose-mode.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "os.h"
+
+void kill_child_dead(int pid)
+{
+ kill(pid, SIGKILL);
+ kill(pid, SIGCONT);
+ do {
+ int n;
+ CATCH_EINTR(n = waitpid(pid, NULL, 0));
+ if (n > 0)
+ kill(pid, SIGCONT);
+ else
+ break;
+ } while(1);
+}
+
+/* Unlocked - don't care if this is a bit off */
+int nsegfaults = 0;
+
+struct {
+ unsigned long address;
+ int is_write;
+ int pid;
+ unsigned long sp;
+ int is_user;
+} segfault_record[1024];
+
+void segv_handler(int sig, union uml_pt_regs *regs)
+{
+ int index, max;
+
+ if(UPT_IS_USER(regs) && !UPT_SEGV_IS_FIXABLE(regs)){
+ bad_segv(UPT_FAULT_ADDR(regs), UPT_IP(regs),
+ UPT_FAULT_WRITE(regs));
+ return;
+ }
+ max = sizeof(segfault_record)/sizeof(segfault_record[0]);
+ index = next_trap_index(max);
+
+ nsegfaults++;
+ segfault_record[index].address = UPT_FAULT_ADDR(regs);
+ segfault_record[index].pid = os_getpid();
+ segfault_record[index].is_write = UPT_FAULT_WRITE(regs);
+ segfault_record[index].sp = UPT_SP(regs);
+ segfault_record[index].is_user = UPT_IS_USER(regs);
+ segv(UPT_FAULT_ADDR(regs), UPT_IP(regs), UPT_FAULT_WRITE(regs),
+ UPT_IS_USER(regs), regs);
+}
+
+void usr2_handler(int sig, union uml_pt_regs *regs)
+{
+ CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
+}
+
+struct signal_info sig_info[] = {
+ [ SIGTRAP ] { .handler = relay_signal,
+ .is_irq = 0 },
+ [ SIGFPE ] { .handler = relay_signal,
+ .is_irq = 0 },
+ [ SIGILL ] { .handler = relay_signal,
+ .is_irq = 0 },
+ [ SIGWINCH ] { .handler = winch,
+ .is_irq = 1 },
+ [ SIGBUS ] { .handler = bus_handler,
+ .is_irq = 0 },
+ [ SIGSEGV] { .handler = segv_handler,
+ .is_irq = 0 },
+ [ SIGIO ] { .handler = sigio_handler,
+ .is_irq = 1 },
+ [ SIGVTALRM ] { .handler = timer_handler,
+ .is_irq = 1 },
+ [ SIGALRM ] { .handler = timer_handler,
+ .is_irq = 1 },
+ [ SIGUSR2 ] { .handler = usr2_handler,
+ .is_irq = 0 },
+};
+
+void do_longjmp(void *b, int val)
+{
+ sigjmp_buf *buf = b;
+
+ siglongjmp(*buf, val);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/Makefile b/arch/um/kernel/tt/Makefile
new file mode 100644
index 0000000..3d5177d
--- /dev/null
+++ b/arch/um/kernel/tt/Makefile
@@ -0,0 +1,28 @@
+#
+# Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+# Licensed under the GPL
+#
+
+extra-y := unmap_fin.o
+clean-files := unmap_tmp.o
+
+obj-y = exec_kern.o exec_user.o gdb.o ksyms.o mem.o mem_user.o process_kern.o \
+ syscall_kern.o syscall_user.o time.o tlb.o tracer.o trap_user.o \
+ uaccess.o uaccess_user.o
+
+obj-$(CONFIG_PT_PROXY) += gdb_kern.o ptproxy/
+
+USER_OBJS := gdb.o time.o tracer.o
+
+include arch/um/scripts/Makefile.rules
+
+UNMAP_CFLAGS := $(patsubst -pg -DPROFILING,,$(USER_CFLAGS))
+UNMAP_CFLAGS := $(patsubst -fprofile-arcs -ftest-coverage,,$(UNMAP_CFLAGS))
+
+#XXX: partially copied from arch/um/scripts/Makefile.rules
+$(obj)/unmap.o: c_flags = -Wp,-MD,$(depfile) $(UNMAP_CFLAGS)
+
+$(obj)/unmap_fin.o : $(obj)/unmap.o
+ $(LD) -r -o $(obj)/unmap_tmp.o $< $(shell $(CC) -print-file-name=libc.a)
+ $(OBJCOPY) $(obj)/unmap_tmp.o $@ -G switcheroo
+
diff --git a/arch/um/kernel/tt/exec_kern.c b/arch/um/kernel/tt/exec_kern.c
new file mode 100644
index 0000000..065b504
--- /dev/null
+++ b/arch/um/kernel/tt/exec_kern.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/mm.h"
+#include "asm/signal.h"
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+#include "asm/pgalloc.h"
+#include "asm/tlbflush.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "irq_user.h"
+#include "time_user.h"
+#include "signal_user.h"
+#include "mem_user.h"
+#include "os.h"
+#include "tlb.h"
+#include "mode.h"
+
+static int exec_tramp(void *sig_stack)
+{
+ init_new_thread_stack(sig_stack, NULL);
+ init_new_thread_signals(1);
+ os_stop_process(os_getpid());
+ return(0);
+}
+
+void flush_thread_tt(void)
+{
+ unsigned long stack;
+ int new_pid;
+
+ stack = alloc_stack(0, 0);
+ if(stack == 0){
+ printk(KERN_ERR
+ "flush_thread : failed to allocate temporary stack\n");
+ do_exit(SIGKILL);
+ }
+
+ new_pid = start_fork_tramp(current->thread_info, stack, 0, exec_tramp);
+ if(new_pid < 0){
+ printk(KERN_ERR
+ "flush_thread : new thread failed, errno = %d\n",
+ -new_pid);
+ do_exit(SIGKILL);
+ }
+
+ if(current_thread->cpu == 0)
+ forward_interrupts(new_pid);
+ current->thread.request.op = OP_EXEC;
+ current->thread.request.u.exec.pid = new_pid;
+ unprotect_stack((unsigned long) current_thread);
+ os_usr1_process(os_getpid());
+ change_sig(SIGUSR1, 1);
+
+ change_sig(SIGUSR1, 0);
+ enable_timer();
+ free_page(stack);
+ protect_memory(uml_reserved, high_physmem - uml_reserved, 1, 1, 0, 1);
+ task_protections((unsigned long) current_thread);
+ force_flush_all();
+ unblock_signals();
+}
+
+void start_thread_tt(struct pt_regs *regs, unsigned long eip,
+ unsigned long esp)
+{
+ set_fs(USER_DS);
+ flush_tlb_mm(current->mm);
+ PT_REGS_IP(regs) = eip;
+ PT_REGS_SP(regs) = esp;
+ PT_FIX_EXEC_STACK(esp);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/exec_user.c b/arch/um/kernel/tt/exec_user.c
new file mode 100644
index 0000000..a92c02f
--- /dev/null
+++ b/arch/um/kernel/tt/exec_user.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sched.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "ptrace_user.h"
+#include "os.h"
+
+void do_exec(int old_pid, int new_pid)
+{
+ unsigned long regs[FRAME_SIZE];
+ int err;
+
+ if((ptrace(PTRACE_ATTACH, new_pid, 0, 0) < 0) ||
+ (ptrace(PTRACE_CONT, new_pid, 0, 0) < 0))
+ tracer_panic("do_exec failed to attach proc - errno = %d",
+ errno);
+
+ CATCH_EINTR(err = waitpid(new_pid, 0, WUNTRACED));
+ if (err < 0)
+ tracer_panic("do_exec failed to attach proc in waitpid - errno = %d",
+ errno);
+
+ if(ptrace_getregs(old_pid, regs) < 0)
+ tracer_panic("do_exec failed to get registers - errno = %d",
+ errno);
+
+ os_kill_ptraced_process(old_pid, 0);
+
+ if (ptrace(PTRACE_OLDSETOPTIONS, new_pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
+ tracer_panic("do_exec: PTRACE_SETOPTIONS failed, errno = %d", errno);
+
+ if(ptrace_setregs(new_pid, regs) < 0)
+ tracer_panic("do_exec failed to start new proc - errno = %d",
+ errno);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/gdb.c b/arch/um/kernel/tt/gdb.c
new file mode 100644
index 0000000..19a0ad7
--- /dev/null
+++ b/arch/um/kernel/tt/gdb.c
@@ -0,0 +1,278 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/types.h>
+#include "ptrace_user.h"
+#include "uml-config.h"
+#include "kern_constants.h"
+#include "chan_user.h"
+#include "init.h"
+#include "user.h"
+#include "debug.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "tt.h"
+#include "sysdep/thread.h"
+
+extern int debugger_pid;
+extern int debugger_fd;
+extern int debugger_parent;
+
+int detach(int pid, int sig)
+{
+ return(ptrace(PTRACE_DETACH, pid, 0, sig));
+}
+
+int attach(int pid)
+{
+ int err;
+
+ err = ptrace(PTRACE_ATTACH, pid, 0, 0);
+ if(err < 0) return(-errno);
+ else return(err);
+}
+
+int cont(int pid)
+{
+ return(ptrace(PTRACE_CONT, pid, 0, 0));
+}
+
+#ifdef UML_CONFIG_PT_PROXY
+
+int debugger_signal(int status, pid_t pid)
+{
+ return(debugger_proxy(status, pid));
+}
+
+void child_signal(pid_t pid, int status)
+{
+ child_proxy(pid, status);
+}
+
+static void gdb_announce(char *dev_name, int dev)
+{
+ printf("gdb assigned device '%s'\n", dev_name);
+}
+
+static struct chan_opts opts = {
+ .announce = gdb_announce,
+ .xterm_title = "UML kernel debugger",
+ .raw = 0,
+ .tramp_stack = 0,
+ .in_kernel = 0,
+};
+
+/* Accessed by the tracing thread, which automatically serializes access */
+static void *xterm_data;
+static int xterm_fd;
+
+extern void *xterm_init(char *, int, struct chan_opts *);
+extern int xterm_open(int, int, int, void *, char **);
+extern void xterm_close(int, void *);
+
+int open_gdb_chan(void)
+{
+ char stack[UM_KERN_PAGE_SIZE], *dummy;
+
+ opts.tramp_stack = (unsigned long) stack;
+ xterm_data = xterm_init("", 0, &opts);
+ xterm_fd = xterm_open(1, 1, 1, xterm_data, &dummy);
+ return(xterm_fd);
+}
+
+static void exit_debugger_cb(void *unused)
+{
+ if(debugger_pid != -1){
+ if(gdb_pid != -1){
+ fake_child_exit();
+ gdb_pid = -1;
+ }
+ else kill_child_dead(debugger_pid);
+ debugger_pid = -1;
+ if(debugger_parent != -1)
+ detach(debugger_parent, SIGINT);
+ }
+ if(xterm_data != NULL) xterm_close(xterm_fd, xterm_data);
+}
+
+static void exit_debugger(void)
+{
+ initial_thread_cb(exit_debugger_cb, NULL);
+}
+
+__uml_exitcall(exit_debugger);
+
+struct gdb_data {
+ char *str;
+ int err;
+};
+
+static void config_gdb_cb(void *arg)
+{
+ struct gdb_data *data = arg;
+ void *task;
+ int pid;
+
+ data->err = -1;
+ if(debugger_pid != -1) exit_debugger_cb(NULL);
+ if(!strncmp(data->str, "pid,", strlen("pid,"))){
+ data->str += strlen("pid,");
+ pid = strtoul(data->str, NULL, 0);
+ task = cpu_tasks[0].task;
+ debugger_pid = attach_debugger(TASK_EXTERN_PID(task), pid, 0);
+ if(debugger_pid != -1){
+ data->err = 0;
+ gdb_pid = pid;
+ }
+ return;
+ }
+ data->err = 0;
+ debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd);
+ init_proxy(debugger_pid, 0, 0);
+}
+
+int gdb_config(char *str)
+{
+ struct gdb_data data;
+
+ if(*str++ != '=') return(-1);
+ data.str = str;
+ initial_thread_cb(config_gdb_cb, &data);
+ return(data.err);
+}
+
+void remove_gdb_cb(void *unused)
+{
+ exit_debugger_cb(NULL);
+}
+
+int gdb_remove(char *unused)
+{
+ initial_thread_cb(remove_gdb_cb, NULL);
+ return(0);
+}
+
+void signal_usr1(int sig)
+{
+ if(debugger_pid != -1){
+ printf("The debugger is already running\n");
+ return;
+ }
+ debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd);
+ init_proxy(debugger_pid, 0, 0);
+}
+
+int init_ptrace_proxy(int idle_pid, int startup, int stop)
+{
+ int pid, status;
+
+ pid = start_debugger(linux_prog, startup, stop, &debugger_fd);
+ status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL);
+ if(pid < 0){
+ cont(idle_pid);
+ return(-1);
+ }
+ init_proxy(pid, 1, status);
+ return(pid);
+}
+
+int attach_debugger(int idle_pid, int pid, int stop)
+{
+ int status = 0, err;
+
+ err = attach(pid);
+ if(err < 0){
+ printf("Failed to attach pid %d, errno = %d\n", pid, -err);
+ return(-1);
+ }
+ if(stop) status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL);
+ init_proxy(pid, 1, status);
+ return(pid);
+}
+
+#ifdef notdef /* Put this back in when it does something useful */
+static int __init uml_gdb_init_setup(char *line, int *add)
+{
+ gdb_init = uml_strdup(line);
+ return 0;
+}
+
+__uml_setup("gdb=", uml_gdb_init_setup,
+"gdb=<channel description>\n\n"
+);
+#endif
+
+static int __init uml_gdb_pid_setup(char *line, int *add)
+{
+ gdb_pid = strtoul(line, NULL, 0);
+ *add = 0;
+ return 0;
+}
+
+__uml_setup("gdb-pid=", uml_gdb_pid_setup,
+"gdb-pid=<pid>\n"
+" gdb-pid is used to attach an external debugger to UML. This may be\n"
+" an already-running gdb or a debugger-like process like strace.\n\n"
+);
+
+#else
+
+int debugger_signal(int status, pid_t pid){ return(0); }
+void child_signal(pid_t pid, int status){ }
+int init_ptrace_proxy(int idle_pid, int startup, int stop)
+{
+ printf("debug requested when CONFIG_PT_PROXY is off\n");
+ kill_child_dead(idle_pid);
+ exit(1);
+}
+
+void signal_usr1(int sig)
+{
+ printf("debug requested when CONFIG_PT_PROXY is off\n");
+}
+
+int attach_debugger(int idle_pid, int pid, int stop)
+{
+ printf("attach_debugger called when CONFIG_PT_PROXY "
+ "is off\n");
+ return(-1);
+}
+
+int config_gdb(char *str)
+{
+ return(-1);
+}
+
+int remove_gdb(void)
+{
+ return(-1);
+}
+
+int init_parent_proxy(int pid)
+{
+ return(-1);
+}
+
+void debugger_parent_signal(int status, int pid)
+{
+}
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/gdb_kern.c b/arch/um/kernel/tt/gdb_kern.c
new file mode 100644
index 0000000..93fb121
--- /dev/null
+++ b/arch/um/kernel/tt/gdb_kern.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/init.h"
+#include "linux/config.h"
+#include "mconsole_kern.h"
+
+#ifdef CONFIG_MCONSOLE
+
+extern int gdb_config(char *str);
+extern int gdb_remove(char *unused);
+
+static struct mc_device gdb_mc = {
+ .name = "gdb",
+ .config = gdb_config,
+ .remove = gdb_remove,
+};
+
+int gdb_mc_init(void)
+{
+ mconsole_register_dev(&gdb_mc);
+ return(0);
+}
+
+__initcall(gdb_mc_init);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/include/debug.h b/arch/um/kernel/tt/include/debug.h
new file mode 100644
index 0000000..8eff674
--- /dev/null
+++ b/arch/um/kernel/tt/include/debug.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) and
+ * Lars Brinkhoff.
+ * Licensed under the GPL
+ */
+
+#ifndef __DEBUG_H
+#define __DEBUG_H
+
+extern int debugger_proxy(int status, pid_t pid);
+extern void child_proxy(pid_t pid, int status);
+extern void init_proxy (pid_t pid, int waiting, int status);
+extern int start_debugger(char *prog, int startup, int stop, int *debugger_fd);
+extern void fake_child_exit(void);
+extern int gdb_config(char *str);
+extern int gdb_remove(char *unused);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/include/mmu-tt.h b/arch/um/kernel/tt/include/mmu-tt.h
new file mode 100644
index 0000000..0440510
--- /dev/null
+++ b/arch/um/kernel/tt/include/mmu-tt.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __TT_MMU_H
+#define __TT_MMU_H
+
+struct mmu_context_tt {
+};
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/include/mode-tt.h b/arch/um/kernel/tt/include/mode-tt.h
new file mode 100644
index 0000000..efe4620
--- /dev/null
+++ b/arch/um/kernel/tt/include/mode-tt.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MODE_TT_H__
+#define __MODE_TT_H__
+
+#include "sysdep/ptrace.h"
+
+enum { OP_NONE, OP_EXEC, OP_FORK, OP_TRACE_ON, OP_REBOOT, OP_HALT, OP_CB };
+
+extern int tracing_pid;
+
+extern int tracer(int (*init_proc)(void *), void *sp);
+extern void user_time_init_tt(void);
+extern void sig_handler_common_tt(int sig, void *sc);
+extern void syscall_handler_tt(int sig, union uml_pt_regs *regs);
+extern void reboot_tt(void);
+extern void halt_tt(void);
+extern int is_tracer_winch(int pid, int fd, void *data);
+extern void kill_off_processes_tt(void);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/include/mode_kern-tt.h b/arch/um/kernel/tt/include/mode_kern-tt.h
new file mode 100644
index 0000000..28aaab3
--- /dev/null
+++ b/arch/um/kernel/tt/include/mode_kern-tt.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __TT_MODE_KERN_H__
+#define __TT_MODE_KERN_H__
+
+#include "linux/sched.h"
+#include "asm/page.h"
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+
+extern void *switch_to_tt(void *prev, void *next);
+extern void flush_thread_tt(void);
+extern void start_thread_tt(struct pt_regs *regs, unsigned long eip,
+ unsigned long esp);
+extern int copy_thread_tt(int nr, unsigned long clone_flags, unsigned long sp,
+ unsigned long stack_top, struct task_struct *p,
+ struct pt_regs *regs);
+extern void release_thread_tt(struct task_struct *task);
+extern void exit_thread_tt(void);
+extern void initial_thread_cb_tt(void (*proc)(void *), void *arg);
+extern void init_idle_tt(void);
+extern void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end);
+extern void flush_tlb_kernel_vm_tt(void);
+extern void __flush_tlb_one_tt(unsigned long addr);
+extern void flush_tlb_range_tt(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end);
+extern void flush_tlb_mm_tt(struct mm_struct *mm);
+extern void force_flush_all_tt(void);
+extern long execute_syscall_tt(void *r);
+extern void before_mem_tt(unsigned long brk_start);
+extern unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out,
+ unsigned long *task_size_out);
+extern int start_uml_tt(void);
+extern int external_pid_tt(struct task_struct *task);
+extern int thread_pid_tt(struct task_struct *task);
+
+#define kmem_end_tt (host_task_size - ABOVE_KMEM)
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/include/tt.h b/arch/um/kernel/tt/include/tt.h
new file mode 100644
index 0000000..c667b67a
--- /dev/null
+++ b/arch/um/kernel/tt/include/tt.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __TT_H__
+#define __TT_H__
+
+#include "sysdep/ptrace.h"
+
+extern int gdb_pid;
+extern int debug;
+extern int debug_stop;
+extern int debug_trace;
+
+extern int honeypot;
+
+extern int fork_tramp(void *sig_stack);
+extern int do_proc_op(void *t, int proc_id);
+extern int tracer(int (*init_proc)(void *), void *sp);
+extern void attach_process(int pid);
+extern void tracer_panic(char *format, ...);
+extern void set_init_pid(int pid);
+extern int set_user_mode(void *task);
+extern void set_tracing(void *t, int tracing);
+extern int is_tracing(void *task);
+extern void syscall_handler(int sig, union uml_pt_regs *regs);
+extern void exit_kernel(int pid, void *task);
+extern void do_syscall(void *task, int pid, int local_using_sysemu);
+extern void do_sigtrap(void *task);
+extern int is_valid_pid(int pid);
+extern void remap_data(void *segment_start, void *segment_end, int w);
+extern long execute_syscall_tt(void *r);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/include/uaccess-tt.h b/arch/um/kernel/tt/include/uaccess-tt.h
new file mode 100644
index 0000000..f0bad01
--- /dev/null
+++ b/arch/um/kernel/tt/include/uaccess-tt.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __TT_UACCESS_H
+#define __TT_UACCESS_H
+
+#include "linux/string.h"
+#include "linux/sched.h"
+#include "asm/processor.h"
+#include "asm/errno.h"
+#include "asm/current.h"
+#include "asm/a.out.h"
+#include "uml_uaccess.h"
+
+#define ABOVE_KMEM (16 * 1024 * 1024)
+
+extern unsigned long end_vm;
+extern unsigned long uml_physmem;
+
+#define under_task_size(addr, size) \
+ (((unsigned long) (addr) < TASK_SIZE) && \
+ (((unsigned long) (addr) + (size)) < TASK_SIZE))
+
+#define is_stack(addr, size) \
+ (((unsigned long) (addr) < STACK_TOP) && \
+ ((unsigned long) (addr) >= STACK_TOP - ABOVE_KMEM) && \
+ (((unsigned long) (addr) + (size)) <= STACK_TOP))
+
+#define access_ok_tt(type, addr, size) \
+ ((type == VERIFY_READ) || (segment_eq(get_fs(), KERNEL_DS)) || \
+ (((unsigned long) (addr) <= ((unsigned long) (addr) + (size))) && \
+ (under_task_size(addr, size) || is_stack(addr, size))))
+
+static inline int verify_area_tt(int type, const void * addr,
+ unsigned long size)
+{
+ return(access_ok_tt(type, addr, size) ? 0 : -EFAULT);
+}
+
+extern unsigned long get_fault_addr(void);
+
+extern int __do_copy_from_user(void *to, const void *from, int n,
+ void **fault_addr, void **fault_catcher);
+extern int __do_strncpy_from_user(char *dst, const char *src, size_t n,
+ void **fault_addr, void **fault_catcher);
+extern int __do_clear_user(void *mem, size_t len, void **fault_addr,
+ void **fault_catcher);
+extern int __do_strnlen_user(const char *str, unsigned long n,
+ void **fault_addr, void **fault_catcher);
+
+extern int copy_from_user_tt(void *to, const void *from, int n);
+extern int copy_to_user_tt(void *to, const void *from, int n);
+extern int strncpy_from_user_tt(char *dst, const char *src, int count);
+extern int __clear_user_tt(void *mem, int len);
+extern int clear_user_tt(void *mem, int len);
+extern int strnlen_user_tt(const void *str, int len);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ksyms.c b/arch/um/kernel/tt/ksyms.c
new file mode 100644
index 0000000..92ec85d
--- /dev/null
+++ b/arch/um/kernel/tt/ksyms.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/module.h"
+#include "asm/uaccess.h"
+#include "mode.h"
+
+EXPORT_SYMBOL(__do_copy_from_user);
+EXPORT_SYMBOL(__do_copy_to_user);
+EXPORT_SYMBOL(__do_strncpy_from_user);
+EXPORT_SYMBOL(__do_strnlen_user);
+EXPORT_SYMBOL(__do_clear_user);
+
+EXPORT_SYMBOL(tracing_pid);
+EXPORT_SYMBOL(honeypot);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/mem.c b/arch/um/kernel/tt/mem.c
new file mode 100644
index 0000000..74346a0
--- /dev/null
+++ b/arch/um/kernel/tt/mem.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/config.h"
+#include "linux/mm.h"
+#include "asm/uaccess.h"
+#include "mem_user.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "kern.h"
+#include "tt.h"
+
+void before_mem_tt(unsigned long brk_start)
+{
+ if(debug)
+ remap_data(UML_ROUND_DOWN(&_stext), UML_ROUND_UP(&_etext), 1);
+ remap_data(UML_ROUND_DOWN(&_sdata), UML_ROUND_UP(&_edata), 1);
+ remap_data(UML_ROUND_DOWN(&__bss_start), UML_ROUND_UP(&_end), 1);
+}
+
+#ifdef CONFIG_HOST_2G_2G
+#define TOP 0x80000000
+#else
+#define TOP 0xc0000000
+#endif
+
+#define SIZE ((CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS) * 0x20000000)
+#define START (TOP - SIZE)
+
+unsigned long set_task_sizes_tt(int arg, unsigned long *host_size_out,
+ unsigned long *task_size_out)
+{
+ /* Round up to the nearest 4M */
+ *host_size_out = ROUND_4M((unsigned long) &arg);
+ *task_size_out = START;
+ return(START);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/mem_user.c b/arch/um/kernel/tt/mem_user.c
new file mode 100644
index 0000000..3085267
--- /dev/null
+++ b/arch/um/kernel/tt/mem_user.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include "tt.h"
+#include "mem_user.h"
+#include "user_util.h"
+
+void remap_data(void *segment_start, void *segment_end, int w)
+{
+ void *addr;
+ unsigned long size;
+ int data, prot;
+
+ if(w) prot = PROT_WRITE;
+ else prot = 0;
+ prot |= PROT_READ | PROT_EXEC;
+ size = (unsigned long) segment_end -
+ (unsigned long) segment_start;
+ data = create_mem_file(size);
+ addr = mmap(NULL, size, PROT_WRITE | PROT_READ, MAP_SHARED, data, 0);
+ if(addr == MAP_FAILED){
+ perror("mapping new data segment");
+ exit(1);
+ }
+ memcpy(addr, segment_start, size);
+ if(switcheroo(data, prot, addr, segment_start, size) < 0){
+ printf("switcheroo failed\n");
+ exit(1);
+ }
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/process_kern.c b/arch/um/kernel/tt/process_kern.c
new file mode 100644
index 0000000..f19f7c1
--- /dev/null
+++ b/arch/um/kernel/tt/process_kern.c
@@ -0,0 +1,476 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/signal.h"
+#include "linux/kernel.h"
+#include "linux/interrupt.h"
+#include "linux/ptrace.h"
+#include "asm/system.h"
+#include "asm/pgalloc.h"
+#include "asm/ptrace.h"
+#include "asm/tlbflush.h"
+#include "irq_user.h"
+#include "signal_user.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "os.h"
+#include "kern.h"
+#include "sigcontext.h"
+#include "time_user.h"
+#include "mem_user.h"
+#include "tlb.h"
+#include "mode.h"
+#include "init.h"
+#include "tt.h"
+
+void *switch_to_tt(void *prev, void *next, void *last)
+{
+ struct task_struct *from, *to, *prev_sched;
+ unsigned long flags;
+ int err, vtalrm, alrm, prof, cpu;
+ char c;
+ /* jailing and SMP are incompatible, so this doesn't need to be
+ * made per-cpu
+ */
+ static int reading;
+
+ from = prev;
+ to = next;
+
+ to->thread.prev_sched = from;
+
+ cpu = from->thread_info->cpu;
+ if(cpu == 0)
+ forward_interrupts(to->thread.mode.tt.extern_pid);
+#ifdef CONFIG_SMP
+ forward_ipi(cpu_data[cpu].ipi_pipe[0], to->thread.mode.tt.extern_pid);
+#endif
+ local_irq_save(flags);
+
+ vtalrm = change_sig(SIGVTALRM, 0);
+ alrm = change_sig(SIGALRM, 0);
+ prof = change_sig(SIGPROF, 0);
+
+ forward_pending_sigio(to->thread.mode.tt.extern_pid);
+
+ c = 0;
+ set_current(to);
+
+ reading = 0;
+ err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
+ if(err != sizeof(c))
+ panic("write of switch_pipe failed, err = %d", -err);
+
+ reading = 1;
+ if((from->exit_state == EXIT_ZOMBIE) ||
+ (from->exit_state == EXIT_DEAD))
+ os_kill_process(os_getpid(), 0);
+
+ err = os_read_file(from->thread.mode.tt.switch_pipe[0], &c, sizeof(c));
+ if(err != sizeof(c))
+ panic("read of switch_pipe failed, errno = %d", -err);
+
+ /* If the process that we have just scheduled away from has exited,
+ * then it needs to be killed here. The reason is that, even though
+ * it will kill itself when it next runs, that may be too late. Its
+ * stack will be freed, possibly before then, and if that happens,
+ * we have a use-after-free situation. So, it gets killed here
+ * in case it has not already killed itself.
+ */
+ prev_sched = current->thread.prev_sched;
+ if((prev_sched->exit_state == EXIT_ZOMBIE) ||
+ (prev_sched->exit_state == EXIT_DEAD))
+ os_kill_process(prev_sched->thread.mode.tt.extern_pid, 1);
+
+ change_sig(SIGVTALRM, vtalrm);
+ change_sig(SIGALRM, alrm);
+ change_sig(SIGPROF, prof);
+
+ arch_switch();
+
+ flush_tlb_all();
+ local_irq_restore(flags);
+
+ return(current->thread.prev_sched);
+}
+
+void release_thread_tt(struct task_struct *task)
+{
+ int pid = task->thread.mode.tt.extern_pid;
+
+ if(os_getpid() != pid)
+ os_kill_process(pid, 0);
+}
+
+void exit_thread_tt(void)
+{
+ os_close_file(current->thread.mode.tt.switch_pipe[0]);
+ os_close_file(current->thread.mode.tt.switch_pipe[1]);
+}
+
+void suspend_new_thread(int fd)
+{
+ int err;
+ char c;
+
+ os_stop_process(os_getpid());
+ err = os_read_file(fd, &c, sizeof(c));
+ if(err != sizeof(c))
+ panic("read failed in suspend_new_thread, err = %d", -err);
+}
+
+void schedule_tail(task_t *prev);
+
+static void new_thread_handler(int sig)
+{
+ unsigned long disable;
+ int (*fn)(void *);
+ void *arg;
+
+ fn = current->thread.request.u.thread.proc;
+ arg = current->thread.request.u.thread.arg;
+
+ UPT_SC(¤t->thread.regs.regs) = (void *) (&sig + 1);
+ disable = (1 << (SIGVTALRM - 1)) | (1 << (SIGALRM - 1)) |
+ (1 << (SIGIO - 1)) | (1 << (SIGPROF - 1));
+ SC_SIGMASK(UPT_SC(¤t->thread.regs.regs)) &= ~disable;
+
+ suspend_new_thread(current->thread.mode.tt.switch_pipe[0]);
+
+ force_flush_all();
+ if(current->thread.prev_sched != NULL)
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ init_new_thread_signals(1);
+ enable_timer();
+ free_page(current->thread.temp_stack);
+ set_cmdline("(kernel thread)");
+
+ change_sig(SIGUSR1, 1);
+ change_sig(SIGVTALRM, 1);
+ change_sig(SIGPROF, 1);
+ local_irq_enable();
+ if(!run_kernel_thread(fn, arg, ¤t->thread.exec_buf))
+ do_exit(0);
+
+ /* XXX No set_user_mode here because a newly execed process will
+ * immediately segfault on its non-existent IP, coming straight back
+ * to the signal handler, which will call set_user_mode on its way
+ * out. This should probably change since it's confusing.
+ */
+}
+
+static int new_thread_proc(void *stack)
+{
+ /* local_irq_disable is needed to block out signals until this thread is
+ * properly scheduled. Otherwise, the tracing thread will get mighty
+ * upset about any signals that arrive before that.
+ * This has the complication that it sets the saved signal mask in
+ * the sigcontext to block signals. This gets restored when this
+ * thread (or a descendant, since they get a copy of this sigcontext)
+ * returns to userspace.
+ * So, this is compensated for elsewhere.
+ * XXX There is still a small window until local_irq_disable() actually
+ * finishes where signals are possible - shouldn't be a problem in
+ * practice since SIGIO hasn't been forwarded here yet, and the
+ * local_irq_disable should finish before a SIGVTALRM has time to be
+ * delivered.
+ */
+
+ local_irq_disable();
+ init_new_thread_stack(stack, new_thread_handler);
+ os_usr1_process(os_getpid());
+ change_sig(SIGUSR1, 1);
+ return(0);
+}
+
+/* Signal masking - signals are blocked at the start of fork_tramp. They
+ * are re-enabled when finish_fork_handler is entered by fork_tramp hitting
+ * itself with a SIGUSR1. set_user_mode has to be run with SIGUSR1 off,
+ * so it is blocked before it's called. They are re-enabled on sigreturn
+ * despite the fact that they were blocked when the SIGUSR1 was issued because
+ * copy_thread copies the parent's sigcontext, including the signal mask
+ * onto the signal frame.
+ */
+
+void finish_fork_handler(int sig)
+{
+ UPT_SC(¤t->thread.regs.regs) = (void *) (&sig + 1);
+ suspend_new_thread(current->thread.mode.tt.switch_pipe[0]);
+
+ force_flush_all();
+ if(current->thread.prev_sched != NULL)
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ enable_timer();
+ change_sig(SIGVTALRM, 1);
+ local_irq_enable();
+ if(current->mm != current->parent->mm)
+ protect_memory(uml_reserved, high_physmem - uml_reserved, 1,
+ 1, 0, 1);
+ task_protections((unsigned long) current_thread);
+
+ free_page(current->thread.temp_stack);
+ local_irq_disable();
+ change_sig(SIGUSR1, 0);
+ set_user_mode(current);
+}
+
+int fork_tramp(void *stack)
+{
+ local_irq_disable();
+ arch_init_thread();
+ init_new_thread_stack(stack, finish_fork_handler);
+
+ os_usr1_process(os_getpid());
+ change_sig(SIGUSR1, 1);
+ return(0);
+}
+
+int copy_thread_tt(int nr, unsigned long clone_flags, unsigned long sp,
+ unsigned long stack_top, struct task_struct * p,
+ struct pt_regs *regs)
+{
+ int (*tramp)(void *);
+ int new_pid, err;
+ unsigned long stack;
+
+ if(current->thread.forking)
+ tramp = fork_tramp;
+ else {
+ tramp = new_thread_proc;
+ p->thread.request.u.thread = current->thread.request.u.thread;
+ }
+
+ err = os_pipe(p->thread.mode.tt.switch_pipe, 1, 1);
+ if(err < 0){
+ printk("copy_thread : pipe failed, err = %d\n", -err);
+ return(err);
+ }
+
+ stack = alloc_stack(0, 0);
+ if(stack == 0){
+ printk(KERN_ERR "copy_thread : failed to allocate "
+ "temporary stack\n");
+ return(-ENOMEM);
+ }
+
+ clone_flags &= CLONE_VM;
+ p->thread.temp_stack = stack;
+ new_pid = start_fork_tramp(p->thread_info, stack, clone_flags, tramp);
+ if(new_pid < 0){
+ printk(KERN_ERR "copy_thread : clone failed - errno = %d\n",
+ -new_pid);
+ return(new_pid);
+ }
+
+ if(current->thread.forking){
+ sc_to_sc(UPT_SC(&p->thread.regs.regs),
+ UPT_SC(¤t->thread.regs.regs));
+ SC_SET_SYSCALL_RETURN(UPT_SC(&p->thread.regs.regs), 0);
+ if(sp != 0) SC_SP(UPT_SC(&p->thread.regs.regs)) = sp;
+ }
+ p->thread.mode.tt.extern_pid = new_pid;
+
+ current->thread.request.op = OP_FORK;
+ current->thread.request.u.fork.pid = new_pid;
+ os_usr1_process(os_getpid());
+
+ /* Enable the signal and then disable it to ensure that it is handled
+ * here, and nowhere else.
+ */
+ change_sig(SIGUSR1, 1);
+
+ change_sig(SIGUSR1, 0);
+ err = 0;
+ return(err);
+}
+
+void reboot_tt(void)
+{
+ current->thread.request.op = OP_REBOOT;
+ os_usr1_process(os_getpid());
+ change_sig(SIGUSR1, 1);
+}
+
+void halt_tt(void)
+{
+ current->thread.request.op = OP_HALT;
+ os_usr1_process(os_getpid());
+ change_sig(SIGUSR1, 1);
+}
+
+void kill_off_processes_tt(void)
+{
+ struct task_struct *p;
+ int me;
+
+ me = os_getpid();
+ for_each_process(p){
+ if(p->thread.mode.tt.extern_pid != me)
+ os_kill_process(p->thread.mode.tt.extern_pid, 0);
+ }
+ if(init_task.thread.mode.tt.extern_pid != me)
+ os_kill_process(init_task.thread.mode.tt.extern_pid, 0);
+}
+
+void initial_thread_cb_tt(void (*proc)(void *), void *arg)
+{
+ if(os_getpid() == tracing_pid){
+ (*proc)(arg);
+ }
+ else {
+ current->thread.request.op = OP_CB;
+ current->thread.request.u.cb.proc = proc;
+ current->thread.request.u.cb.arg = arg;
+ os_usr1_process(os_getpid());
+ change_sig(SIGUSR1, 1);
+
+ change_sig(SIGUSR1, 0);
+ }
+}
+
+int do_proc_op(void *t, int proc_id)
+{
+ struct task_struct *task;
+ struct thread_struct *thread;
+ int op, pid;
+
+ task = t;
+ thread = &task->thread;
+ op = thread->request.op;
+ switch(op){
+ case OP_NONE:
+ case OP_TRACE_ON:
+ break;
+ case OP_EXEC:
+ pid = thread->request.u.exec.pid;
+ do_exec(thread->mode.tt.extern_pid, pid);
+ thread->mode.tt.extern_pid = pid;
+ cpu_tasks[task->thread_info->cpu].pid = pid;
+ break;
+ case OP_FORK:
+ attach_process(thread->request.u.fork.pid);
+ break;
+ case OP_CB:
+ (*thread->request.u.cb.proc)(thread->request.u.cb.arg);
+ break;
+ case OP_REBOOT:
+ case OP_HALT:
+ break;
+ default:
+ tracer_panic("Bad op in do_proc_op");
+ break;
+ }
+ thread->request.op = OP_NONE;
+ return(op);
+}
+
+void init_idle_tt(void)
+{
+ default_idle();
+}
+
+extern void start_kernel(void);
+
+static int start_kernel_proc(void *unused)
+{
+ int pid;
+
+ block_signals();
+ pid = os_getpid();
+
+ cpu_tasks[0].pid = pid;
+ cpu_tasks[0].task = current;
+#ifdef CONFIG_SMP
+ cpu_online_map = cpumask_of_cpu(0);
+#endif
+ if(debug) os_stop_process(pid);
+ start_kernel();
+ return(0);
+}
+
+void set_tracing(void *task, int tracing)
+{
+ ((struct task_struct *) task)->thread.mode.tt.tracing = tracing;
+}
+
+int is_tracing(void *t)
+{
+ return (((struct task_struct *) t)->thread.mode.tt.tracing);
+}
+
+int set_user_mode(void *t)
+{
+ struct task_struct *task;
+
+ task = t ? t : current;
+ if(task->thread.mode.tt.tracing)
+ return(1);
+ task->thread.request.op = OP_TRACE_ON;
+ os_usr1_process(os_getpid());
+ return(0);
+}
+
+void set_init_pid(int pid)
+{
+ int err;
+
+ init_task.thread.mode.tt.extern_pid = pid;
+ err = os_pipe(init_task.thread.mode.tt.switch_pipe, 1, 1);
+ if(err)
+ panic("Can't create switch pipe for init_task, errno = %d",
+ -err);
+}
+
+int start_uml_tt(void)
+{
+ void *sp;
+ int pages;
+
+ pages = (1 << CONFIG_KERNEL_STACK_ORDER);
+ sp = (void *) ((unsigned long) init_task.thread_info) +
+ pages * PAGE_SIZE - sizeof(unsigned long);
+ return(tracer(start_kernel_proc, sp));
+}
+
+int external_pid_tt(struct task_struct *task)
+{
+ return(task->thread.mode.tt.extern_pid);
+}
+
+int thread_pid_tt(struct task_struct *task)
+{
+ return(task->thread.mode.tt.extern_pid);
+}
+
+int is_valid_pid(int pid)
+{
+ struct task_struct *task;
+
+ read_lock(&tasklist_lock);
+ for_each_process(task){
+ if(task->thread.mode.tt.extern_pid == pid){
+ read_unlock(&tasklist_lock);
+ return(1);
+ }
+ }
+ read_unlock(&tasklist_lock);
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ptproxy/Makefile b/arch/um/kernel/tt/ptproxy/Makefile
new file mode 100644
index 0000000..3ad5b77
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/Makefile
@@ -0,0 +1,10 @@
+#
+# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+obj-y = proxy.o ptrace.o sysdep.o wait.o
+
+USER_OBJS := $(obj-y)
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/tt/ptproxy/proxy.c b/arch/um/kernel/tt/ptproxy/proxy.c
new file mode 100644
index 0000000..58800c5
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/proxy.c
@@ -0,0 +1,377 @@
+/**********************************************************************
+proxy.c
+
+Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
+terms and conditions.
+
+Jeff Dike (jdike@karaya.com) : Modified for integration into uml
+**********************************************************************/
+
+/* XXX This file shouldn't refer to CONFIG_* */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <termios.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <asm/unistd.h>
+#include "ptrace_user.h"
+
+#include "ptproxy.h"
+#include "sysdep.h"
+#include "wait.h"
+
+#include "user_util.h"
+#include "user.h"
+#include "os.h"
+#include "tempfile.h"
+
+static int debugger_wait(debugger_state *debugger, int *status, int options,
+ int (*syscall)(debugger_state *debugger, pid_t child),
+ int (*normal_return)(debugger_state *debugger,
+ pid_t unused),
+ int (*wait_return)(debugger_state *debugger,
+ pid_t unused))
+{
+ if(debugger->real_wait){
+ debugger->handle_trace = normal_return;
+ syscall_continue(debugger->pid);
+ debugger->real_wait = 0;
+ return(1);
+ }
+ debugger->wait_status_ptr = status;
+ debugger->wait_options = options;
+ if((debugger->debugee != NULL) && debugger->debugee->event){
+ syscall_continue(debugger->pid);
+ wait_for_stop(debugger->pid, SIGTRAP, PTRACE_SYSCALL,
+ NULL);
+ (*wait_return)(debugger, -1);
+ return(0);
+ }
+ else if(debugger->wait_options & WNOHANG){
+ syscall_cancel(debugger->pid, 0);
+ debugger->handle_trace = syscall;
+ return(0);
+ }
+ else {
+ syscall_pause(debugger->pid);
+ debugger->handle_trace = wait_return;
+ debugger->waiting = 1;
+ }
+ return(1);
+}
+
+/*
+ * Handle debugger trap, i.e. syscall.
+ */
+
+int debugger_syscall(debugger_state *debugger, pid_t child)
+{
+ long arg1, arg2, arg3, arg4, arg5, result;
+ int syscall, ret = 0;
+
+ syscall = get_syscall(debugger->pid, &arg1, &arg2, &arg3, &arg4,
+ &arg5);
+
+ switch(syscall){
+ case __NR_execve:
+ /* execve never returns */
+ debugger->handle_trace = debugger_syscall;
+ break;
+
+ case __NR_ptrace:
+ if(debugger->debugee->pid != 0) arg2 = debugger->debugee->pid;
+ if(!debugger->debugee->in_context)
+ child = debugger->debugee->pid;
+ result = proxy_ptrace(debugger, arg1, arg2, arg3, arg4, child,
+ &ret);
+ syscall_cancel(debugger->pid, result);
+ debugger->handle_trace = debugger_syscall;
+ return(ret);
+
+#ifdef __NR_waitpid
+ case __NR_waitpid:
+#endif
+ case __NR_wait4:
+ if(!debugger_wait(debugger, (int *) arg2, arg3,
+ debugger_syscall, debugger_normal_return,
+ proxy_wait_return))
+ return(0);
+ break;
+
+ case __NR_kill:
+ if(!debugger->debugee->in_context)
+ child = debugger->debugee->pid;
+ if(arg1 == debugger->debugee->pid){
+ result = kill(child, arg2);
+ syscall_cancel(debugger->pid, result);
+ debugger->handle_trace = debugger_syscall;
+ return(0);
+ }
+ else debugger->handle_trace = debugger_normal_return;
+ break;
+
+ default:
+ debugger->handle_trace = debugger_normal_return;
+ }
+
+ syscall_continue(debugger->pid);
+ return(0);
+}
+
+/* Used by the tracing thread */
+static debugger_state parent;
+static int parent_syscall(debugger_state *debugger, int pid);
+
+int init_parent_proxy(int pid)
+{
+ parent = ((debugger_state) { .pid = pid,
+ .wait_options = 0,
+ .wait_status_ptr = NULL,
+ .waiting = 0,
+ .real_wait = 0,
+ .expecting_child = 0,
+ .handle_trace = parent_syscall,
+ .debugee = NULL } );
+ return(0);
+}
+
+int parent_normal_return(debugger_state *debugger, pid_t unused)
+{
+ debugger->handle_trace = parent_syscall;
+ syscall_continue(debugger->pid);
+ return(0);
+}
+
+static int parent_syscall(debugger_state *debugger, int pid)
+{
+ long arg1, arg2, arg3, arg4, arg5;
+ int syscall;
+
+ syscall = get_syscall(pid, &arg1, &arg2, &arg3, &arg4, &arg5);
+
+ if((syscall == __NR_wait4)
+#ifdef __NR_waitpid
+ || (syscall == __NR_waitpid)
+#endif
+ ){
+ debugger_wait(&parent, (int *) arg2, arg3, parent_syscall,
+ parent_normal_return, parent_wait_return);
+ }
+ else ptrace(PTRACE_SYSCALL, pid, 0, 0);
+ return(0);
+}
+
+int debugger_normal_return(debugger_state *debugger, pid_t unused)
+{
+ debugger->handle_trace = debugger_syscall;
+ syscall_continue(debugger->pid);
+ return(0);
+}
+
+void debugger_cancelled_return(debugger_state *debugger, int result)
+{
+ debugger->handle_trace = debugger_syscall;
+ syscall_set_result(debugger->pid, result);
+ syscall_continue(debugger->pid);
+}
+
+/* Used by the tracing thread */
+static debugger_state debugger;
+static debugee_state debugee;
+
+void init_proxy (pid_t debugger_pid, int stopped, int status)
+{
+ debugger.pid = debugger_pid;
+ debugger.handle_trace = debugger_syscall;
+ debugger.debugee = &debugee;
+ debugger.waiting = 0;
+ debugger.real_wait = 0;
+ debugger.expecting_child = 0;
+
+ debugee.pid = 0;
+ debugee.traced = 0;
+ debugee.stopped = stopped;
+ debugee.event = 0;
+ debugee.zombie = 0;
+ debugee.died = 0;
+ debugee.wait_status = status;
+ debugee.in_context = 1;
+}
+
+int debugger_proxy(int status, int pid)
+{
+ int ret = 0, sig;
+
+ if(WIFSTOPPED(status)){
+ sig = WSTOPSIG(status);
+ if (sig == SIGTRAP)
+ ret = (*debugger.handle_trace)(&debugger, pid);
+
+ else if(sig == SIGCHLD){
+ if(debugger.expecting_child){
+ ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
+ debugger.expecting_child = 0;
+ }
+ else if(debugger.waiting)
+ real_wait_return(&debugger);
+ else {
+ ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
+ debugger.real_wait = 1;
+ }
+ }
+ else ptrace(PTRACE_SYSCALL, debugger.pid, 0, sig);
+ }
+ else if(WIFEXITED(status)){
+ tracer_panic("debugger (pid %d) exited with status %d",
+ debugger.pid, WEXITSTATUS(status));
+ }
+ else if(WIFSIGNALED(status)){
+ tracer_panic("debugger (pid %d) exited with signal %d",
+ debugger.pid, WTERMSIG(status));
+ }
+ else {
+ tracer_panic("proxy got unknown status (0x%x) on debugger "
+ "(pid %d)", status, debugger.pid);
+ }
+ return(ret);
+}
+
+void child_proxy(pid_t pid, int status)
+{
+ debugee.event = 1;
+ debugee.wait_status = status;
+
+ if(WIFSTOPPED(status)){
+ debugee.stopped = 1;
+ debugger.expecting_child = 1;
+ kill(debugger.pid, SIGCHLD);
+ }
+ else if(WIFEXITED(status) || WIFSIGNALED(status)){
+ debugee.zombie = 1;
+ debugger.expecting_child = 1;
+ kill(debugger.pid, SIGCHLD);
+ }
+ else panic("proxy got unknown status (0x%x) on child (pid %d)",
+ status, pid);
+}
+
+void debugger_parent_signal(int status, int pid)
+{
+ int sig;
+
+ if(WIFSTOPPED(status)){
+ sig = WSTOPSIG(status);
+ if(sig == SIGTRAP) (*parent.handle_trace)(&parent, pid);
+ else ptrace(PTRACE_SYSCALL, pid, 0, sig);
+ }
+}
+
+void fake_child_exit(void)
+{
+ int status, pid;
+
+ child_proxy(1, W_EXITCODE(0, 0));
+ while(debugger.waiting == 1){
+ CATCH_EINTR(pid = waitpid(debugger.pid, &status, WUNTRACED));
+ if(pid != debugger.pid){
+ printk("fake_child_exit - waitpid failed, "
+ "errno = %d\n", errno);
+ return;
+ }
+ debugger_proxy(status, debugger.pid);
+ }
+ CATCH_EINTR(pid = waitpid(debugger.pid, &status, WUNTRACED));
+ if(pid != debugger.pid){
+ printk("fake_child_exit - waitpid failed, "
+ "errno = %d\n", errno);
+ return;
+ }
+ if(ptrace(PTRACE_DETACH, debugger.pid, 0, SIGCONT) < 0)
+ printk("fake_child_exit - PTRACE_DETACH failed, errno = %d\n",
+ errno);
+}
+
+char gdb_init_string[] =
+"att 1 \n\
+b panic \n\
+b stop \n\
+handle SIGWINCH nostop noprint pass \n\
+";
+
+int start_debugger(char *prog, int startup, int stop, int *fd_out)
+{
+ int slave, child;
+
+ slave = open_gdb_chan();
+ child = fork();
+ if(child == 0){
+ char *tempname = NULL;
+ int fd;
+
+ if(setsid() < 0) perror("setsid");
+ if((dup2(slave, 0) < 0) || (dup2(slave, 1) < 0) ||
+ (dup2(slave, 2) < 0)){
+ printk("start_debugger : dup2 failed, errno = %d\n",
+ errno);
+ exit(1);
+ }
+ if(ioctl(0, TIOCSCTTY, 0) < 0){
+ printk("start_debugger : TIOCSCTTY failed, "
+ "errno = %d\n", errno);
+ exit(1);
+ }
+ if(tcsetpgrp (1, os_getpid()) < 0){
+ printk("start_debugger : tcsetpgrp failed, "
+ "errno = %d\n", errno);
+#ifdef notdef
+ exit(1);
+#endif
+ }
+ fd = make_tempfile("/tmp/gdb_init-XXXXXX", &tempname, 0);
+ if(fd < 0){
+ printk("start_debugger : make_tempfile failed,"
+ "err = %d\n", -fd);
+ exit(1);
+ }
+ os_write_file(fd, gdb_init_string, sizeof(gdb_init_string) - 1);
+ if(startup){
+ if(stop){
+ os_write_file(fd, "b start_kernel\n",
+ strlen("b start_kernel\n"));
+ }
+ os_write_file(fd, "c\n", strlen("c\n"));
+ }
+ if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
+ printk("start_debugger : PTRACE_TRACEME failed, "
+ "errno = %d\n", errno);
+ exit(1);
+ }
+ execlp("gdb", "gdb", "--command", tempname, prog, NULL);
+ printk("start_debugger : exec of gdb failed, errno = %d\n",
+ errno);
+ }
+ if(child < 0){
+ printk("start_debugger : fork for gdb failed, errno = %d\n",
+ errno);
+ return(-1);
+ }
+ *fd_out = slave;
+ return(child);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ptproxy/ptproxy.h b/arch/um/kernel/tt/ptproxy/ptproxy.h
new file mode 100644
index 0000000..5eb0285
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/ptproxy.h
@@ -0,0 +1,61 @@
+/**********************************************************************
+ptproxy.h
+
+Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
+terms and conditions.
+**********************************************************************/
+
+#ifndef __PTPROXY_H
+#define __PTPROXY_H
+
+#include <sys/types.h>
+
+typedef struct debugger debugger_state;
+typedef struct debugee debugee_state;
+
+struct debugger
+{
+ pid_t pid;
+ int wait_options;
+ int *wait_status_ptr;
+ unsigned int waiting : 1;
+ unsigned int real_wait : 1;
+ unsigned int expecting_child : 1;
+ int (*handle_trace) (debugger_state *, pid_t);
+
+ debugee_state *debugee;
+};
+
+struct debugee
+{
+ pid_t pid;
+ int wait_status;
+ unsigned int died : 1;
+ unsigned int event : 1;
+ unsigned int stopped : 1;
+ unsigned int trace_singlestep : 1;
+ unsigned int trace_syscall : 1;
+ unsigned int traced : 1;
+ unsigned int zombie : 1;
+ unsigned int in_context : 1;
+};
+
+extern int debugger_syscall(debugger_state *debugger, pid_t pid);
+extern int debugger_normal_return (debugger_state *debugger, pid_t unused);
+
+extern long proxy_ptrace (struct debugger *, int, pid_t, long, long, pid_t,
+ int *strace_out);
+extern void debugger_cancelled_return(debugger_state *debugger, int result);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ptproxy/ptrace.c b/arch/um/kernel/tt/ptproxy/ptrace.c
new file mode 100644
index 0000000..528a5fc
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/ptrace.c
@@ -0,0 +1,237 @@
+/**********************************************************************
+ptrace.c
+
+Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
+terms and conditions.
+
+Jeff Dike (jdike@karaya.com) : Modified for integration into uml
+**********************************************************************/
+
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+
+#include "ptproxy.h"
+#include "debug.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "ptrace_user.h"
+#include "tt.h"
+
+long proxy_ptrace(struct debugger *debugger, int arg1, pid_t arg2,
+ long arg3, long arg4, pid_t child, int *ret)
+{
+ sigset_t relay;
+ long result;
+ int status;
+
+ *ret = 0;
+ if(debugger->debugee->died) return(-ESRCH);
+
+ switch(arg1){
+ case PTRACE_ATTACH:
+ if(debugger->debugee->traced) return(-EPERM);
+
+ debugger->debugee->pid = arg2;
+ debugger->debugee->traced = 1;
+
+ if(is_valid_pid(arg2) && (arg2 != child)){
+ debugger->debugee->in_context = 0;
+ kill(arg2, SIGSTOP);
+ debugger->debugee->event = 1;
+ debugger->debugee->wait_status = W_STOPCODE(SIGSTOP);
+ }
+ else {
+ debugger->debugee->in_context = 1;
+ if(debugger->debugee->stopped)
+ child_proxy(child, W_STOPCODE(SIGSTOP));
+ else kill(child, SIGSTOP);
+ }
+
+ return(0);
+
+ case PTRACE_DETACH:
+ if(!debugger->debugee->traced) return(-EPERM);
+
+ debugger->debugee->traced = 0;
+ debugger->debugee->pid = 0;
+ if(!debugger->debugee->in_context)
+ kill(child, SIGCONT);
+
+ return(0);
+
+ case PTRACE_CONT:
+ if(!debugger->debugee->in_context) return(-EPERM);
+ *ret = PTRACE_CONT;
+ return(ptrace(PTRACE_CONT, child, arg3, arg4));
+
+#ifdef UM_HAVE_GETFPREGS
+ case PTRACE_GETFPREGS:
+ {
+ long regs[FP_FRAME_SIZE];
+ int i, result;
+
+ result = ptrace(PTRACE_GETFPREGS, child, 0, regs);
+ if(result == -1) return(-errno);
+
+ for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
+ ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i,
+ regs[i]);
+ return(result);
+ }
+#endif
+
+#ifdef UM_HAVE_GETFPXREGS
+ case PTRACE_GETFPXREGS:
+ {
+ long regs[FPX_FRAME_SIZE];
+ int i, result;
+
+ result = ptrace(PTRACE_GETFPXREGS, child, 0, regs);
+ if(result == -1) return(-errno);
+
+ for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
+ ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i,
+ regs[i]);
+ return(result);
+ }
+#endif
+
+#ifdef UM_HAVE_GETREGS
+ case PTRACE_GETREGS:
+ {
+ long regs[FRAME_SIZE];
+ int i, result;
+
+ result = ptrace(PTRACE_GETREGS, child, 0, regs);
+ if(result == -1) return(-errno);
+
+ for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
+ ptrace (PTRACE_POKEDATA, debugger->pid,
+ arg4 + 4 * i, regs[i]);
+ return(result);
+ }
+ break;
+#endif
+
+ case PTRACE_KILL:
+ result = ptrace(PTRACE_KILL, child, arg3, arg4);
+ if(result == -1) return(-errno);
+
+ return(result);
+
+ case PTRACE_PEEKDATA:
+ case PTRACE_PEEKTEXT:
+ case PTRACE_PEEKUSR:
+ /* The value being read out could be -1, so we have to
+ * check errno to see if there's an error, and zero it
+ * beforehand so we're not faked out by an old error
+ */
+
+ errno = 0;
+ result = ptrace(arg1, child, arg3, 0);
+ if((result == -1) && (errno != 0)) return(-errno);
+
+ result = ptrace(PTRACE_POKEDATA, debugger->pid, arg4, result);
+ if(result == -1) return(-errno);
+
+ return(result);
+
+ case PTRACE_POKEDATA:
+ case PTRACE_POKETEXT:
+ case PTRACE_POKEUSR:
+ result = ptrace(arg1, child, arg3, arg4);
+ if(result == -1) return(-errno);
+
+ if(arg1 == PTRACE_POKEUSR) ptrace_pokeuser(arg3, arg4);
+ return(result);
+
+#ifdef UM_HAVE_SETFPREGS
+ case PTRACE_SETFPREGS:
+ {
+ long regs[FP_FRAME_SIZE];
+ int i;
+
+ for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
+ regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid,
+ arg4 + 4 * i, 0);
+ result = ptrace(PTRACE_SETFPREGS, child, 0, regs);
+ if(result == -1) return(-errno);
+
+ return(result);
+ }
+#endif
+
+#ifdef UM_HAVE_SETFPXREGS
+ case PTRACE_SETFPXREGS:
+ {
+ long regs[FPX_FRAME_SIZE];
+ int i;
+
+ for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
+ regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid,
+ arg4 + 4 * i, 0);
+ result = ptrace(PTRACE_SETFPXREGS, child, 0, regs);
+ if(result == -1) return(-errno);
+
+ return(result);
+ }
+#endif
+
+#ifdef UM_HAVE_SETREGS
+ case PTRACE_SETREGS:
+ {
+ long regs[FRAME_SIZE];
+ int i;
+
+ for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
+ regs[i] = ptrace(PTRACE_PEEKDATA, debugger->pid,
+ arg4 + 4 * i, 0);
+ result = ptrace(PTRACE_SETREGS, child, 0, regs);
+ if(result == -1) return(-errno);
+
+ return(result);
+ }
+#endif
+
+ case PTRACE_SINGLESTEP:
+ if(!debugger->debugee->in_context) return(-EPERM);
+ sigemptyset(&relay);
+ sigaddset(&relay, SIGSEGV);
+ sigaddset(&relay, SIGILL);
+ sigaddset(&relay, SIGBUS);
+ result = ptrace(PTRACE_SINGLESTEP, child, arg3, arg4);
+ if(result == -1) return(-errno);
+
+ status = wait_for_stop(child, SIGTRAP, PTRACE_SINGLESTEP,
+ &relay);
+ child_proxy(child, status);
+ return(result);
+
+ case PTRACE_SYSCALL:
+ if(!debugger->debugee->in_context) return(-EPERM);
+ result = ptrace(PTRACE_SYSCALL, child, arg3, arg4);
+ if(result == -1) return(-errno);
+
+ *ret = PTRACE_SYSCALL;
+ return(result);
+
+ case PTRACE_TRACEME:
+ default:
+ return(-EINVAL);
+ }
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ptproxy/sysdep.c b/arch/um/kernel/tt/ptproxy/sysdep.c
new file mode 100644
index 0000000..a5f0e01
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/sysdep.c
@@ -0,0 +1,70 @@
+/**********************************************************************
+sysdep.c
+
+Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
+terms and conditions.
+**********************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <linux/unistd.h>
+#include "ptrace_user.h"
+#include "user_util.h"
+#include "user.h"
+
+int get_syscall(pid_t pid, long *arg1, long *arg2, long *arg3, long *arg4,
+ long *arg5)
+{
+ *arg1 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG1_OFFSET, 0);
+ *arg2 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG2_OFFSET, 0);
+ *arg3 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG3_OFFSET, 0);
+ *arg4 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG4_OFFSET, 0);
+ *arg5 = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_ARG5_OFFSET, 0);
+ return(ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET, 0));
+}
+
+void syscall_cancel(pid_t pid, int result)
+{
+ if((ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
+ __NR_getpid) < 0) ||
+ (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) ||
+ (wait_for_stop(pid, SIGTRAP, PTRACE_SYSCALL, NULL) < 0) ||
+ (ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result) < 0) ||
+ (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0))
+ printk("ptproxy: couldn't cancel syscall: errno = %d\n",
+ errno);
+}
+
+void syscall_set_result(pid_t pid, long result)
+{
+ ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, result);
+}
+
+void syscall_continue(pid_t pid)
+{
+ ptrace(PTRACE_SYSCALL, pid, 0, 0);
+}
+
+int syscall_pause(pid_t pid)
+{
+ if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_pause) < 0){
+ printk("syscall_change - ptrace failed, errno = %d\n", errno);
+ return(-1);
+ }
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ptproxy/sysdep.h b/arch/um/kernel/tt/ptproxy/sysdep.h
new file mode 100644
index 0000000..735f488
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/sysdep.h
@@ -0,0 +1,25 @@
+/**********************************************************************
+sysdep.h
+
+Copyright (C) 1999 Lars Brinkhoff.
+Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+See the file COPYING for licensing terms and conditions.
+**********************************************************************/
+
+extern int get_syscall(pid_t pid, long *arg1, long *arg2, long *arg3,
+ long *arg4, long *arg5);
+extern void syscall_cancel (pid_t pid, long result);
+extern void syscall_set_result (pid_t pid, long result);
+extern void syscall_continue (pid_t pid);
+extern int syscall_pause(pid_t pid);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ptproxy/wait.c b/arch/um/kernel/tt/ptproxy/wait.c
new file mode 100644
index 0000000..12f6319
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/wait.c
@@ -0,0 +1,86 @@
+/**********************************************************************
+wait.c
+
+Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
+terms and conditions.
+
+**********************************************************************/
+
+#include <errno.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#include "ptproxy.h"
+#include "sysdep.h"
+#include "wait.h"
+#include "user_util.h"
+#include "ptrace_user.h"
+#include "sysdep/ptrace.h"
+#include "sysdep/sigcontext.h"
+
+int proxy_wait_return(struct debugger *debugger, pid_t unused)
+{
+ debugger->waiting = 0;
+
+ if(debugger->debugee->died || (debugger->wait_options & __WCLONE)){
+ debugger_cancelled_return(debugger, -ECHILD);
+ return(0);
+ }
+
+ if(debugger->debugee->zombie && debugger->debugee->event)
+ debugger->debugee->died = 1;
+
+ if(debugger->debugee->event){
+ debugger->debugee->event = 0;
+ ptrace(PTRACE_POKEDATA, debugger->pid,
+ debugger->wait_status_ptr,
+ debugger->debugee->wait_status);
+ /* if (wait4)
+ ptrace (PTRACE_POKEDATA, pid, rusage_ptr, ...); */
+ debugger_cancelled_return(debugger, debugger->debugee->pid);
+ return(0);
+ }
+
+ /* pause will return -EINTR, which happens to be right for wait */
+ debugger_normal_return(debugger, -1);
+ return(0);
+}
+
+int parent_wait_return(struct debugger *debugger, pid_t unused)
+{
+ return(debugger_normal_return(debugger, -1));
+}
+
+int real_wait_return(struct debugger *debugger)
+{
+ unsigned long ip;
+ int pid;
+
+ pid = debugger->pid;
+
+ ip = ptrace(PTRACE_PEEKUSR, pid, PT_IP_OFFSET, 0);
+ IP_RESTART_SYSCALL(ip);
+
+ if(ptrace(PTRACE_POKEUSR, pid, PT_IP_OFFSET, ip) < 0)
+ tracer_panic("real_wait_return : Failed to restart system "
+ "call, errno = %d\n", errno);
+
+ if((ptrace(PTRACE_SYSCALL, debugger->pid, 0, SIGCHLD) < 0) ||
+ (ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
+ (ptrace(PTRACE_SYSCALL, debugger->pid, 0, 0) < 0) ||
+ debugger_normal_return(debugger, -1))
+ tracer_panic("real_wait_return : gdb failed to wait, "
+ "errno = %d\n", errno);
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/ptproxy/wait.h b/arch/um/kernel/tt/ptproxy/wait.h
new file mode 100644
index 0000000..542e73e
--- /dev/null
+++ b/arch/um/kernel/tt/ptproxy/wait.h
@@ -0,0 +1,15 @@
+/**********************************************************************
+wait.h
+
+Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing
+terms and conditions.
+**********************************************************************/
+
+#ifndef __PTPROXY_WAIT_H
+#define __PTPROXY_WAIT_H
+
+extern int proxy_wait_return(struct debugger *debugger, pid_t unused);
+extern int real_wait_return(struct debugger *debugger);
+extern int parent_wait_return(struct debugger *debugger, pid_t unused);
+
+#endif
diff --git a/arch/um/kernel/tt/syscall_kern.c b/arch/um/kernel/tt/syscall_kern.c
new file mode 100644
index 0000000..2650a62
--- /dev/null
+++ b/arch/um/kernel/tt/syscall_kern.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/types.h"
+#include "linux/utime.h"
+#include "linux/sys.h"
+#include "linux/ptrace.h"
+#include "asm/unistd.h"
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+#include "asm/stat.h"
+#include "sysdep/syscalls.h"
+#include "kern_util.h"
+
+extern syscall_handler_t *sys_call_table[];
+
+long execute_syscall_tt(void *r)
+{
+ struct pt_regs *regs = r;
+ long res;
+ int syscall;
+
+#ifdef CONFIG_SYSCALL_DEBUG
+ current->thread.nsyscalls++;
+ nsyscalls++;
+#endif
+ syscall = UPT_SYSCALL_NR(®s->regs);
+
+ if((syscall >= NR_syscalls) || (syscall < 0))
+ res = -ENOSYS;
+ else res = EXECUTE_SYSCALL(syscall, regs);
+
+ return(res);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/syscall_user.c b/arch/um/kernel/tt/syscall_user.c
new file mode 100644
index 0000000..e4e7e9c
--- /dev/null
+++ b/arch/um/kernel/tt/syscall_user.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <asm/unistd.h>
+#include "sysdep/ptrace.h"
+#include "sigcontext.h"
+#include "ptrace_user.h"
+#include "task.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "syscall_user.h"
+#include "tt.h"
+
+
+void syscall_handler_tt(int sig, union uml_pt_regs *regs)
+{
+ void *sc;
+ long result;
+ int syscall;
+#ifdef UML_CONFIG_DEBUG_SYSCALL
+ int index;
+#endif
+
+ syscall = UPT_SYSCALL_NR(regs);
+ sc = UPT_SC(regs);
+ SC_START_SYSCALL(sc);
+
+#ifdef UML_CONFIG_DEBUG_SYSCALL
+ index = record_syscall_start(syscall);
+#endif
+ syscall_trace(regs, 0);
+ result = execute_syscall_tt(regs);
+
+ /* regs->sc may have changed while the system call ran (there may
+ * have been an interrupt or segfault), so it needs to be refreshed.
+ */
+ UPT_SC(regs) = sc;
+
+ SC_SET_SYSCALL_RETURN(sc, result);
+
+ syscall_trace(regs, 1);
+#ifdef UML_CONFIG_DEBUG_SYSCALL
+ record_syscall_end(index, result);
+#endif
+}
+
+void do_sigtrap(void *task)
+{
+ UPT_SYSCALL_NR(TASK_REGS(task)) = -1;
+}
+
+void do_syscall(void *task, int pid, int local_using_sysemu)
+{
+ unsigned long proc_regs[FRAME_SIZE];
+
+ if(ptrace_getregs(pid, proc_regs) < 0)
+ tracer_panic("Couldn't read registers");
+
+ UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
+
+ if(((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
+ ((unsigned long *) PT_IP(proc_regs) <= &_etext))
+ tracer_panic("I'm tracing myself and I can't get out");
+
+ /* advanced sysemu mode set syscall number to -1 automatically */
+ if (local_using_sysemu==2)
+ return;
+
+ /* syscall number -1 in sysemu skips syscall restarting in host */
+ if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
+ local_using_sysemu ? -1 : __NR_getpid) < 0)
+ tracer_panic("do_syscall : Nullifying syscall failed, "
+ "errno = %d", errno);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/time.c b/arch/um/kernel/tt/time.c
new file mode 100644
index 0000000..8565b71
--- /dev/null
+++ b/arch/um/kernel/tt/time.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+#include <sys/time.h>
+#include <time_user.h>
+#include "process.h"
+#include "user.h"
+
+void user_time_init_tt(void)
+{
+ if(signal(SIGVTALRM, (__sighandler_t) alarm_handler) == SIG_ERR)
+ panic("Couldn't set SIGVTALRM handler");
+ set_interval(ITIMER_VIRTUAL);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/tlb.c b/arch/um/kernel/tt/tlb.c
new file mode 100644
index 0000000..203216a
--- /dev/null
+++ b/arch/um/kernel/tt/tlb.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/kernel.h"
+#include "linux/sched.h"
+#include "linux/mm.h"
+#include "asm/page.h"
+#include "asm/pgtable.h"
+#include "asm/uaccess.h"
+#include "asm/tlbflush.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "os.h"
+#include "tlb.h"
+
+static void do_ops(int unused, struct host_vm_op *ops, int last)
+{
+ struct host_vm_op *op;
+ int i;
+
+ for(i = 0; i <= last; i++){
+ op = &ops[i];
+ switch(op->type){
+ case MMAP:
+ os_map_memory((void *) op->u.mmap.addr, op->u.mmap.fd,
+ op->u.mmap.offset, op->u.mmap.len,
+ op->u.mmap.r, op->u.mmap.w,
+ op->u.mmap.x);
+ break;
+ case MUNMAP:
+ os_unmap_memory((void *) op->u.munmap.addr,
+ op->u.munmap.len);
+ break;
+ case MPROTECT:
+ protect_memory(op->u.mprotect.addr, op->u.munmap.len,
+ op->u.mprotect.r, op->u.mprotect.w,
+ op->u.mprotect.x, 1);
+ break;
+ default:
+ printk("Unknown op type %d in do_ops\n", op->type);
+ break;
+ }
+ }
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr,
+ unsigned long end_addr, int force)
+{
+ if((current->thread.mode.tt.extern_pid != -1) &&
+ (current->thread.mode.tt.extern_pid != os_getpid()))
+ panic("fix_range fixing wrong address space, current = 0x%p",
+ current);
+
+ fix_range_common(mm, start_addr, end_addr, force, 0, do_ops);
+}
+
+atomic_t vmchange_seq = ATOMIC_INIT(1);
+
+void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end)
+{
+ if(flush_tlb_kernel_range_common(start, end))
+ atomic_inc(&vmchange_seq);
+}
+
+static void protect_vm_page(unsigned long addr, int w, int must_succeed)
+{
+ int err;
+
+ err = protect_memory(addr, PAGE_SIZE, 1, w, 1, must_succeed);
+ if(err == 0) return;
+ else if((err == -EFAULT) || (err == -ENOMEM)){
+ flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+ protect_vm_page(addr, w, 1);
+ }
+ else panic("protect_vm_page : protect failed, errno = %d\n", err);
+}
+
+void mprotect_kernel_vm(int w)
+{
+ struct mm_struct *mm;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ unsigned long addr;
+
+ mm = &init_mm;
+ for(addr = start_vm; addr < end_vm;){
+ pgd = pgd_offset(mm, addr);
+ pud = pud_offset(pgd, addr);
+ pmd = pmd_offset(pud, addr);
+ if(pmd_present(*pmd)){
+ pte = pte_offset_kernel(pmd, addr);
+ if(pte_present(*pte)) protect_vm_page(addr, w, 0);
+ addr += PAGE_SIZE;
+ }
+ else addr += PMD_SIZE;
+ }
+}
+
+void flush_tlb_kernel_vm_tt(void)
+{
+ flush_tlb_kernel_range(start_vm, end_vm);
+}
+
+void __flush_tlb_one_tt(unsigned long addr)
+{
+ flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
+}
+
+void flush_tlb_range_tt(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ if(vma->vm_mm != current->mm) return;
+
+ /* Assumes that the range start ... end is entirely within
+ * either process memory or kernel vm
+ */
+ if((start >= start_vm) && (start < end_vm)){
+ if(flush_tlb_kernel_range_common(start, end))
+ atomic_inc(&vmchange_seq);
+ }
+ else fix_range(vma->vm_mm, start, end, 0);
+}
+
+void flush_tlb_mm_tt(struct mm_struct *mm)
+{
+ unsigned long seq;
+
+ if(mm != current->mm) return;
+
+ fix_range(mm, 0, STACK_TOP, 0);
+
+ seq = atomic_read(&vmchange_seq);
+ if(current->thread.mode.tt.vm_seq == seq)
+ return;
+ current->thread.mode.tt.vm_seq = seq;
+ flush_tlb_kernel_range_common(start_vm, end_vm);
+}
+
+void force_flush_all_tt(void)
+{
+ fix_range(current->mm, 0, STACK_TOP, 1);
+ flush_tlb_kernel_range_common(start_vm, end_vm);
+}
diff --git a/arch/um/kernel/tt/tracer.c b/arch/um/kernel/tt/tracer.c
new file mode 100644
index 0000000..7b5d937
--- /dev/null
+++ b/arch/um/kernel/tt/tracer.c
@@ -0,0 +1,480 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <sched.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include "user.h"
+#include "sysdep/ptrace.h"
+#include "sigcontext.h"
+#include "sysdep/sigcontext.h"
+#include "os.h"
+#include "signal_user.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "process.h"
+#include "kern_util.h"
+#include "chan_user.h"
+#include "ptrace_user.h"
+#include "mode.h"
+#include "tt.h"
+
+static int tracer_winch[2];
+
+int is_tracer_winch(int pid, int fd, void *data)
+{
+ if(pid != tracing_pid)
+ return(0);
+
+ register_winch_irq(tracer_winch[0], fd, -1, data);
+ return(1);
+}
+
+static void tracer_winch_handler(int sig)
+{
+ int n;
+ char c = 1;
+
+ n = os_write_file(tracer_winch[1], &c, sizeof(c));
+ if(n != sizeof(c))
+ printk("tracer_winch_handler - write failed, err = %d\n", -n);
+}
+
+/* Called only by the tracing thread during initialization */
+
+static void setup_tracer_winch(void)
+{
+ int err;
+
+ err = os_pipe(tracer_winch, 1, 1);
+ if(err < 0){
+ printk("setup_tracer_winch : os_pipe failed, err = %d\n", -err);
+ return;
+ }
+ signal(SIGWINCH, tracer_winch_handler);
+}
+
+void attach_process(int pid)
+{
+ if((ptrace(PTRACE_ATTACH, pid, 0, 0) < 0) ||
+ (ptrace(PTRACE_CONT, pid, 0, 0) < 0))
+ tracer_panic("OP_FORK failed to attach pid");
+ wait_for_stop(pid, SIGSTOP, PTRACE_CONT, NULL);
+ if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
+ tracer_panic("OP_FORK: PTRACE_SETOPTIONS failed, errno = %d", errno);
+ if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
+ tracer_panic("OP_FORK failed to continue process");
+}
+
+void tracer_panic(char *format, ...)
+{
+ va_list ap;
+
+ va_start(ap, format);
+ vprintf(format, ap);
+ va_end(ap);
+ printf("\n");
+ while(1) pause();
+}
+
+static void tracer_segv(int sig, struct sigcontext sc)
+{
+ printf("Tracing thread segfault at address 0x%lx, ip 0x%lx\n",
+ SC_FAULT_ADDR(&sc), SC_IP(&sc));
+ while(1)
+ pause();
+}
+
+/* Changed early in boot, and then only read */
+int debug = 0;
+int debug_stop = 1;
+int debug_parent = 0;
+int honeypot = 0;
+
+static int signal_tramp(void *arg)
+{
+ int (*proc)(void *);
+
+ if(honeypot && munmap((void *) (host_task_size - 0x10000000),
+ 0x10000000))
+ panic("Unmapping stack failed");
+ if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0)
+ panic("ptrace PTRACE_TRACEME failed");
+ os_stop_process(os_getpid());
+ change_sig(SIGWINCH, 0);
+ signal(SIGUSR1, SIG_IGN);
+ change_sig(SIGCHLD, 0);
+ signal(SIGSEGV, (__sighandler_t) sig_handler);
+ set_cmdline("(idle thread)");
+ set_init_pid(os_getpid());
+ proc = arg;
+ return((*proc)(NULL));
+}
+
+static void sleeping_process_signal(int pid, int sig)
+{
+ switch(sig){
+ /* These two result from UML being ^Z-ed and bg-ed. PTRACE_CONT is
+ * right because the process must be in the kernel already.
+ */
+ case SIGCONT:
+ case SIGTSTP:
+ if(ptrace(PTRACE_CONT, pid, 0, sig) < 0)
+ tracer_panic("sleeping_process_signal : Failed to "
+ "continue pid %d, signal = %d, "
+ "errno = %d\n", pid, sig, errno);
+ break;
+
+ /* This happens when the debugger (e.g. strace) is doing system call
+ * tracing on the kernel. During a context switch, the current task
+ * will be set to the incoming process and the outgoing process will
+ * hop into write and then read. Since it's not the current process
+ * any more, the trace of those will land here. So, we need to just
+ * PTRACE_SYSCALL it.
+ */
+ case (SIGTRAP + 0x80):
+ if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
+ tracer_panic("sleeping_process_signal : Failed to "
+ "PTRACE_SYSCALL pid %d, errno = %d\n",
+ pid, errno);
+ break;
+ case SIGSTOP:
+ break;
+ default:
+ tracer_panic("sleeping process %d got unexpected "
+ "signal : %d\n", pid, sig);
+ break;
+ }
+}
+
+/* Accessed only by the tracing thread */
+int debugger_pid = -1;
+int debugger_parent = -1;
+int debugger_fd = -1;
+int gdb_pid = -1;
+
+struct {
+ int pid;
+ int signal;
+ unsigned long addr;
+ struct timeval time;
+} signal_record[1024][32];
+
+int signal_index[32];
+int nsignals = 0;
+int debug_trace = 0;
+extern int io_nsignals, io_count, intr_count;
+
+extern void signal_usr1(int sig);
+
+int tracing_pid = -1;
+
+int tracer(int (*init_proc)(void *), void *sp)
+{
+ void *task = NULL;
+ int status, pid = 0, sig = 0, cont_type, tracing = 0, op = 0;
+ int proc_id = 0, n, err, old_tracing = 0, strace = 0;
+ int local_using_sysemu = 0;
+#ifdef UML_CONFIG_SYSCALL_DEBUG
+ unsigned long eip = 0;
+ int last_index;
+#endif
+ signal(SIGPIPE, SIG_IGN);
+ setup_tracer_winch();
+ tracing_pid = os_getpid();
+ printf("tracing thread pid = %d\n", tracing_pid);
+
+ pid = clone(signal_tramp, sp, CLONE_FILES | SIGCHLD, init_proc);
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if(n < 0){
+ printf("waitpid on idle thread failed, errno = %d\n", errno);
+ exit(1);
+ }
+ if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0) {
+ printf("Failed to PTRACE_SETOPTIONS for idle thread, errno = %d\n", errno);
+ exit(1);
+ }
+ if((ptrace(PTRACE_CONT, pid, 0, 0) < 0)){
+ printf("Failed to continue idle thread, errno = %d\n", errno);
+ exit(1);
+ }
+
+ signal(SIGSEGV, (sighandler_t) tracer_segv);
+ signal(SIGUSR1, signal_usr1);
+ if(debug_trace){
+ printf("Tracing thread pausing to be attached\n");
+ stop();
+ }
+ if(debug){
+ if(gdb_pid != -1)
+ debugger_pid = attach_debugger(pid, gdb_pid, 1);
+ else debugger_pid = init_ptrace_proxy(pid, 1, debug_stop);
+ if(debug_parent){
+ debugger_parent = os_process_parent(debugger_pid);
+ init_parent_proxy(debugger_parent);
+ err = attach(debugger_parent);
+ if(err){
+ printf("Failed to attach debugger parent %d, "
+ "errno = %d\n", debugger_parent, -err);
+ debugger_parent = -1;
+ }
+ else {
+ if(ptrace(PTRACE_SYSCALL, debugger_parent,
+ 0, 0) < 0){
+ printf("Failed to continue debugger "
+ "parent, errno = %d\n", errno);
+ debugger_parent = -1;
+ }
+ }
+ }
+ }
+ set_cmdline("(tracing thread)");
+ while(1){
+ CATCH_EINTR(pid = waitpid(-1, &status, WUNTRACED));
+ if(pid <= 0){
+ if(errno != ECHILD){
+ printf("wait failed - errno = %d\n", errno);
+ }
+ continue;
+ }
+ if(pid == debugger_pid){
+ int cont = 0;
+
+ if(WIFEXITED(status) || WIFSIGNALED(status))
+ debugger_pid = -1;
+ /* XXX Figure out how to deal with gdb and SMP */
+ else cont = debugger_signal(status, cpu_tasks[0].pid);
+ if(cont == PTRACE_SYSCALL) strace = 1;
+ continue;
+ }
+ else if(pid == debugger_parent){
+ debugger_parent_signal(status, pid);
+ continue;
+ }
+ nsignals++;
+ if(WIFEXITED(status)) ;
+#ifdef notdef
+ {
+ printf("Child %d exited with status %d\n", pid,
+ WEXITSTATUS(status));
+ }
+#endif
+ else if(WIFSIGNALED(status)){
+ sig = WTERMSIG(status);
+ if(sig != 9){
+ printf("Child %d exited with signal %d\n", pid,
+ sig);
+ }
+ }
+ else if(WIFSTOPPED(status)){
+ proc_id = pid_to_processor_id(pid);
+ sig = WSTOPSIG(status);
+#ifdef UML_CONFIG_SYSCALL_DEBUG
+ if(signal_index[proc_id] == 1024){
+ signal_index[proc_id] = 0;
+ last_index = 1023;
+ }
+ else last_index = signal_index[proc_id] - 1;
+ if(((sig == SIGPROF) || (sig == SIGVTALRM) ||
+ (sig == SIGALRM)) &&
+ (signal_record[proc_id][last_index].signal == sig)&&
+ (signal_record[proc_id][last_index].pid == pid))
+ signal_index[proc_id] = last_index;
+ signal_record[proc_id][signal_index[proc_id]].pid = pid;
+ gettimeofday(&signal_record[proc_id][signal_index[proc_id]].time, NULL);
+ eip = ptrace(PTRACE_PEEKUSR, pid, PT_IP_OFFSET, 0);
+ signal_record[proc_id][signal_index[proc_id]].addr = eip;
+ signal_record[proc_id][signal_index[proc_id]++].signal = sig;
+#endif
+ if(proc_id == -1){
+ sleeping_process_signal(pid, sig);
+ continue;
+ }
+
+ task = cpu_tasks[proc_id].task;
+ tracing = is_tracing(task);
+ old_tracing = tracing;
+
+ /* Assume: no syscall, when coming from user */
+ if ( tracing )
+ do_sigtrap(task);
+
+ switch(sig){
+ case SIGUSR1:
+ sig = 0;
+ op = do_proc_op(task, proc_id);
+ switch(op){
+ /*
+ * This is called when entering user mode; after
+ * this, we start intercepting syscalls.
+ *
+ * In fact, a process is started in kernel mode,
+ * so with is_tracing() == 0 (and that is reset
+ * when executing syscalls, since UML kernel has
+ * the right to do syscalls);
+ */
+ case OP_TRACE_ON:
+ arch_leave_kernel(task, pid);
+ tracing = 1;
+ break;
+ case OP_REBOOT:
+ case OP_HALT:
+ unmap_physmem();
+ kmalloc_ok = 0;
+ os_kill_ptraced_process(pid, 0);
+ /* Now let's reap remaining zombies */
+ errno = 0;
+ do {
+ waitpid(-1, &status,
+ WUNTRACED);
+ } while (errno != ECHILD);
+ return(op == OP_REBOOT);
+ case OP_NONE:
+ printf("Detaching pid %d\n", pid);
+ detach(pid, SIGSTOP);
+ continue;
+ default:
+ break;
+ }
+ /* OP_EXEC switches host processes on us,
+ * we want to continue the new one.
+ */
+ pid = cpu_tasks[proc_id].pid;
+ break;
+ case (SIGTRAP + 0x80):
+ if(!tracing && (debugger_pid != -1)){
+ child_signal(pid, status & 0x7fff);
+ continue;
+ }
+ tracing = 0;
+ /* local_using_sysemu has been already set
+ * below, since if we are here, is_tracing() on
+ * the traced task was 1, i.e. the process had
+ * already run through one iteration of the
+ * loop which executed a OP_TRACE_ON request.*/
+ do_syscall(task, pid, local_using_sysemu);
+ sig = SIGUSR2;
+ break;
+ case SIGTRAP:
+ if(!tracing && (debugger_pid != -1)){
+ child_signal(pid, status);
+ continue;
+ }
+ tracing = 0;
+ break;
+ case SIGPROF:
+ if(tracing) sig = 0;
+ break;
+ case SIGCHLD:
+ case SIGHUP:
+ sig = 0;
+ break;
+ case SIGSEGV:
+ case SIGIO:
+ case SIGALRM:
+ case SIGVTALRM:
+ case SIGFPE:
+ case SIGBUS:
+ case SIGILL:
+ case SIGWINCH:
+
+ default:
+ tracing = 0;
+ break;
+ }
+ set_tracing(task, tracing);
+
+ if(!tracing && old_tracing)
+ arch_enter_kernel(task, pid);
+
+ if(!tracing && (debugger_pid != -1) && (sig != 0) &&
+ (sig != SIGALRM) && (sig != SIGVTALRM) &&
+ (sig != SIGSEGV) && (sig != SIGTRAP) &&
+ (sig != SIGUSR2) && (sig != SIGIO) &&
+ (sig != SIGFPE)){
+ child_signal(pid, status);
+ continue;
+ }
+
+ local_using_sysemu = get_using_sysemu();
+
+ if(tracing)
+ cont_type = SELECT_PTRACE_OPERATION(local_using_sysemu,
+ singlestepping(task));
+ else if((debugger_pid != -1) && strace)
+ cont_type = PTRACE_SYSCALL;
+ else
+ cont_type = PTRACE_CONT;
+
+ if(ptrace(cont_type, pid, 0, sig) != 0){
+ tracer_panic("ptrace failed to continue "
+ "process - errno = %d\n",
+ errno);
+ }
+ }
+ }
+ return(0);
+}
+
+static int __init uml_debug_setup(char *line, int *add)
+{
+ char *next;
+
+ debug = 1;
+ *add = 0;
+ if(*line != '=') return(0);
+ line++;
+
+ while(line != NULL){
+ next = strchr(line, ',');
+ if(next) *next++ = '\0';
+
+ if(!strcmp(line, "go")) debug_stop = 0;
+ else if(!strcmp(line, "parent")) debug_parent = 1;
+ else printf("Unknown debug option : '%s'\n", line);
+
+ line = next;
+ }
+ return(0);
+}
+
+__uml_setup("debug", uml_debug_setup,
+"debug\n"
+" Starts up the kernel under the control of gdb. See the \n"
+" kernel debugging tutorial and the debugging session pages\n"
+" at http://user-mode-linux.sourceforge.net/ for more information.\n\n"
+);
+
+static int __init uml_debugtrace_setup(char *line, int *add)
+{
+ debug_trace = 1;
+ return 0;
+}
+__uml_setup("debugtrace", uml_debugtrace_setup,
+"debugtrace\n"
+" Causes the tracing thread to pause until it is attached by a\n"
+" debugger and continued. This is mostly for debugging crashes\n"
+" early during boot, and should be pretty much obsoleted by\n"
+" the debug switch.\n\n"
+);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/trap_user.c b/arch/um/kernel/tt/trap_user.c
new file mode 100644
index 0000000..92a3820
--- /dev/null
+++ b/arch/um/kernel/tt/trap_user.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <signal.h>
+#include "sysdep/ptrace.h"
+#include "signal_user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "task.h"
+#include "tt.h"
+
+void sig_handler_common_tt(int sig, void *sc_ptr)
+{
+ struct sigcontext *sc = sc_ptr;
+ struct tt_regs save_regs, *r;
+ struct signal_info *info;
+ int save_errno = errno, is_user;
+
+ /* This is done because to allow SIGSEGV to be delivered inside a SEGV
+ * handler. This can happen in copy_user, and if SEGV is disabled,
+ * the process will die.
+ */
+ if(sig == SIGSEGV)
+ change_sig(SIGSEGV, 1);
+
+ r = &TASK_REGS(get_current())->tt;
+ save_regs = *r;
+ is_user = user_context(SC_SP(sc));
+ r->sc = sc;
+ if(sig != SIGUSR2)
+ r->syscall = -1;
+
+ info = &sig_info[sig];
+ if(!info->is_irq) unblock_signals();
+
+ (*info->handler)(sig, (union uml_pt_regs *) r);
+
+ if(is_user){
+ interrupt_end();
+ block_signals();
+ set_user_mode(NULL);
+ }
+ *r = save_regs;
+ errno = save_errno;
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/uaccess.c b/arch/um/kernel/tt/uaccess.c
new file mode 100644
index 0000000..a72aa63
--- /dev/null
+++ b/arch/um/kernel/tt/uaccess.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "asm/uaccess.h"
+
+int copy_from_user_tt(void *to, const void __user *from, int n)
+{
+ if(!access_ok_tt(VERIFY_READ, from, n))
+ return(n);
+
+ return(__do_copy_from_user(to, from, n, ¤t->thread.fault_addr,
+ ¤t->thread.fault_catcher));
+}
+
+int copy_to_user_tt(void __user *to, const void *from, int n)
+{
+ if(!access_ok_tt(VERIFY_WRITE, to, n))
+ return(n);
+
+ return(__do_copy_to_user(to, from, n, ¤t->thread.fault_addr,
+ ¤t->thread.fault_catcher));
+}
+
+int strncpy_from_user_tt(char *dst, const char __user *src, int count)
+{
+ int n;
+
+ if(!access_ok_tt(VERIFY_READ, src, 1))
+ return(-EFAULT);
+
+ n = __do_strncpy_from_user(dst, src, count,
+ ¤t->thread.fault_addr,
+ ¤t->thread.fault_catcher);
+ if(n < 0) return(-EFAULT);
+ return(n);
+}
+
+int __clear_user_tt(void __user *mem, int len)
+{
+ return(__do_clear_user(mem, len,
+ ¤t->thread.fault_addr,
+ ¤t->thread.fault_catcher));
+}
+
+int clear_user_tt(void __user *mem, int len)
+{
+ if(!access_ok_tt(VERIFY_WRITE, mem, len))
+ return(len);
+
+ return(__do_clear_user(mem, len, ¤t->thread.fault_addr,
+ ¤t->thread.fault_catcher));
+}
+
+int strnlen_user_tt(const void __user *str, int len)
+{
+ return(__do_strnlen_user(str, len,
+ ¤t->thread.fault_addr,
+ ¤t->thread.fault_catcher));
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/uaccess_user.c b/arch/um/kernel/tt/uaccess_user.c
new file mode 100644
index 0000000..f014755
--- /dev/null
+++ b/arch/um/kernel/tt/uaccess_user.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <setjmp.h>
+#include <string.h>
+#include "user_util.h"
+#include "uml_uaccess.h"
+#include "task.h"
+#include "kern_util.h"
+
+int __do_copy_from_user(void *to, const void *from, int n,
+ void **fault_addr, void **fault_catcher)
+{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
+ unsigned long fault;
+ int faulted;
+
+ fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
+ __do_copy, &faulted);
+ TASK_REGS(get_current())->tt = save;
+
+ if(!faulted) return(0);
+ else return(n - (fault - (unsigned long) from));
+}
+
+static void __do_strncpy(void *dst, const void *src, int count)
+{
+ strncpy(dst, src, count);
+}
+
+int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
+ void **fault_addr, void **fault_catcher)
+{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
+ unsigned long fault;
+ int faulted;
+
+ fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
+ __do_strncpy, &faulted);
+ TASK_REGS(get_current())->tt = save;
+
+ if(!faulted) return(strlen(dst));
+ else return(-1);
+}
+
+static void __do_clear(void *to, const void *from, int n)
+{
+ memset(to, 0, n);
+}
+
+int __do_clear_user(void *mem, unsigned long len,
+ void **fault_addr, void **fault_catcher)
+{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
+ unsigned long fault;
+ int faulted;
+
+ fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
+ __do_clear, &faulted);
+ TASK_REGS(get_current())->tt = save;
+
+ if(!faulted) return(0);
+ else return(len - (fault - (unsigned long) mem));
+}
+
+int __do_strnlen_user(const char *str, unsigned long n,
+ void **fault_addr, void **fault_catcher)
+{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
+ int ret;
+ unsigned long *faddrp = (unsigned long *)fault_addr;
+ sigjmp_buf jbuf;
+
+ *fault_catcher = &jbuf;
+ if(sigsetjmp(jbuf, 1) == 0)
+ ret = strlen(str) + 1;
+ else ret = *faddrp - (unsigned long) str;
+
+ *fault_addr = NULL;
+ *fault_catcher = NULL;
+
+ TASK_REGS(get_current())->tt = save;
+ return ret;
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tt/unmap.c b/arch/um/kernel/tt/unmap.c
new file mode 100644
index 0000000..3f7aecd
--- /dev/null
+++ b/arch/um/kernel/tt/unmap.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <sys/mman.h>
+
+int switcheroo(int fd, int prot, void *from, void *to, int size)
+{
+ if(munmap(to, size) < 0){
+ return(-1);
+ }
+ if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){
+ return(-1);
+ }
+ if(munmap(from, size) < 0){
+ return(-1);
+ }
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/tty_log.c b/arch/um/kernel/tty_log.c
new file mode 100644
index 0000000..9ada656
--- /dev/null
+++ b/arch/um/kernel/tty_log.c
@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) and
+ * geoffrey hing <ghing@net.ohio-state.edu>
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include "init.h"
+#include "user.h"
+#include "kern_util.h"
+#include "os.h"
+
+#define TTY_LOG_DIR "./"
+
+/* Set early in boot and then unchanged */
+static char *tty_log_dir = TTY_LOG_DIR;
+static int tty_log_fd = -1;
+
+#define TTY_LOG_OPEN 1
+#define TTY_LOG_CLOSE 2
+#define TTY_LOG_WRITE 3
+#define TTY_LOG_EXEC 4
+
+#define TTY_READ 1
+#define TTY_WRITE 2
+
+struct tty_log_buf {
+ int what;
+ unsigned long tty;
+ int len;
+ int direction;
+ unsigned long sec;
+ unsigned long usec;
+};
+
+int open_tty_log(void *tty, void *current_tty)
+{
+ struct timeval tv;
+ struct tty_log_buf data;
+ char buf[strlen(tty_log_dir) + sizeof("01234567890-01234567\0")];
+ int fd;
+
+ gettimeofday(&tv, NULL);
+ if(tty_log_fd != -1){
+ data = ((struct tty_log_buf) { .what = TTY_LOG_OPEN,
+ .tty = (unsigned long) tty,
+ .len = sizeof(current_tty),
+ .direction = 0,
+ .sec = tv.tv_sec,
+ .usec = tv.tv_usec } );
+ os_write_file(tty_log_fd, &data, sizeof(data));
+ os_write_file(tty_log_fd, ¤t_tty, data.len);
+ return(tty_log_fd);
+ }
+
+ sprintf(buf, "%s/%0u-%0u", tty_log_dir, (unsigned int) tv.tv_sec,
+ (unsigned int) tv.tv_usec);
+
+ fd = os_open_file(buf, of_append(of_create(of_rdwr(OPENFLAGS()))),
+ 0644);
+ if(fd < 0){
+ printk("open_tty_log : couldn't open '%s', errno = %d\n",
+ buf, -fd);
+ }
+ return(fd);
+}
+
+void close_tty_log(int fd, void *tty)
+{
+ struct tty_log_buf data;
+ struct timeval tv;
+
+ if(tty_log_fd != -1){
+ gettimeofday(&tv, NULL);
+ data = ((struct tty_log_buf) { .what = TTY_LOG_CLOSE,
+ .tty = (unsigned long) tty,
+ .len = 0,
+ .direction = 0,
+ .sec = tv.tv_sec,
+ .usec = tv.tv_usec } );
+ os_write_file(tty_log_fd, &data, sizeof(data));
+ return;
+ }
+ os_close_file(fd);
+}
+
+static int log_chunk(int fd, const char *buf, int len)
+{
+ int total = 0, try, missed, n;
+ char chunk[64];
+
+ while(len > 0){
+ try = (len > sizeof(chunk)) ? sizeof(chunk) : len;
+ missed = copy_from_user_proc(chunk, (char *) buf, try);
+ try -= missed;
+ n = os_write_file(fd, chunk, try);
+ if(n != try) {
+ if(n < 0)
+ return(n);
+ return(-EIO);
+ }
+ if(missed != 0)
+ return(-EFAULT);
+
+ len -= try;
+ total += try;
+ buf += try;
+ }
+
+ return(total);
+}
+
+int write_tty_log(int fd, const char *buf, int len, void *tty, int is_read)
+{
+ struct timeval tv;
+ struct tty_log_buf data;
+ int direction;
+
+ if(fd == tty_log_fd){
+ gettimeofday(&tv, NULL);
+ direction = is_read ? TTY_READ : TTY_WRITE;
+ data = ((struct tty_log_buf) { .what = TTY_LOG_WRITE,
+ .tty = (unsigned long) tty,
+ .len = len,
+ .direction = direction,
+ .sec = tv.tv_sec,
+ .usec = tv.tv_usec } );
+ os_write_file(tty_log_fd, &data, sizeof(data));
+ }
+
+ return(log_chunk(fd, buf, len));
+}
+
+void log_exec(char **argv, void *tty)
+{
+ struct timeval tv;
+ struct tty_log_buf data;
+ char **ptr,*arg;
+ int len;
+
+ if(tty_log_fd == -1) return;
+
+ gettimeofday(&tv, NULL);
+
+ len = 0;
+ for(ptr = argv; ; ptr++){
+ if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
+ return;
+ if(arg == NULL) break;
+ len += strlen_user_proc(arg);
+ }
+
+ data = ((struct tty_log_buf) { .what = TTY_LOG_EXEC,
+ .tty = (unsigned long) tty,
+ .len = len,
+ .direction = 0,
+ .sec = tv.tv_sec,
+ .usec = tv.tv_usec } );
+ os_write_file(tty_log_fd, &data, sizeof(data));
+
+ for(ptr = argv; ; ptr++){
+ if(copy_from_user_proc(&arg, ptr, sizeof(arg)))
+ return;
+ if(arg == NULL) break;
+ log_chunk(tty_log_fd, arg, strlen_user_proc(arg));
+ }
+}
+
+extern void register_tty_logger(int (*opener)(void *, void *),
+ int (*writer)(int, const char *, int,
+ void *, int),
+ void (*closer)(int, void *));
+
+static int register_logger(void)
+{
+ register_tty_logger(open_tty_log, write_tty_log, close_tty_log);
+ return(0);
+}
+
+__uml_initcall(register_logger);
+
+static int __init set_tty_log_dir(char *name, int *add)
+{
+ tty_log_dir = name;
+ return 0;
+}
+
+__uml_setup("tty_log_dir=", set_tty_log_dir,
+"tty_log_dir=<directory>\n"
+" This is used to specify the directory where the logs of all pty\n"
+" data from this UML machine will be written.\n\n"
+);
+
+static int __init set_tty_log_fd(char *name, int *add)
+{
+ char *end;
+
+ tty_log_fd = strtoul(name, &end, 0);
+ if((*end != '\0') || (end == name)){
+ printf("set_tty_log_fd - strtoul failed on '%s'\n", name);
+ tty_log_fd = -1;
+ }
+
+ *add = 0;
+ return 0;
+}
+
+__uml_setup("tty_log_fd=", set_tty_log_fd,
+"tty_log_fd=<fd>\n"
+" This is used to specify a preconfigured file descriptor to which all\n"
+" tty data will be written. Preconfigure the descriptor with something\n"
+" like '10>tty_log tty_log_fd=10'.\n\n"
+);
+
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/uaccess_user.c b/arch/um/kernel/uaccess_user.c
new file mode 100644
index 0000000..d035257
--- /dev/null
+++ b/arch/um/kernel/uaccess_user.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <setjmp.h>
+#include <string.h>
+
+/* These are here rather than tt/uaccess.c because skas mode needs them in
+ * order to do SIGBUS recovery when a tmpfs mount runs out of room.
+ */
+
+unsigned long __do_user_copy(void *to, const void *from, int n,
+ void **fault_addr, void **fault_catcher,
+ void (*op)(void *to, const void *from,
+ int n), int *faulted_out)
+{
+ unsigned long *faddrp = (unsigned long *) fault_addr, ret;
+
+ sigjmp_buf jbuf;
+ *fault_catcher = &jbuf;
+ if(sigsetjmp(jbuf, 1) == 0){
+ (*op)(to, from, n);
+ ret = 0;
+ *faulted_out = 0;
+ }
+ else {
+ ret = *faddrp;
+ *faulted_out = 1;
+ }
+ *fault_addr = NULL;
+ *fault_catcher = NULL;
+ return ret;
+}
+
+void __do_copy(void *to, const void *from, int n)
+{
+ memcpy(to, from, n);
+}
+
+
+int __do_copy_to_user(void *to, const void *from, int n,
+ void **fault_addr, void **fault_catcher)
+{
+ unsigned long fault;
+ int faulted;
+
+ fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
+ __do_copy, &faulted);
+ if(!faulted) return(0);
+ else return(n - (fault - (unsigned long) to));
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
new file mode 100644
index 0000000..5c49d88
--- /dev/null
+++ b/arch/um/kernel/um_arch.c
@@ -0,0 +1,467 @@
+/*
+ * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/kernel.h"
+#include "linux/sched.h"
+#include "linux/notifier.h"
+#include "linux/mm.h"
+#include "linux/types.h"
+#include "linux/tty.h"
+#include "linux/init.h"
+#include "linux/bootmem.h"
+#include "linux/spinlock.h"
+#include "linux/utsname.h"
+#include "linux/sysrq.h"
+#include "linux/seq_file.h"
+#include "linux/delay.h"
+#include "linux/module.h"
+#include "asm/page.h"
+#include "asm/pgtable.h"
+#include "asm/ptrace.h"
+#include "asm/elf.h"
+#include "asm/user.h"
+#include "ubd_user.h"
+#include "asm/current.h"
+#include "asm/setup.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "mem_user.h"
+#include "mem.h"
+#include "umid.h"
+#include "initrd.h"
+#include "init.h"
+#include "os.h"
+#include "choose-mode.h"
+#include "mode_kern.h"
+#include "mode.h"
+
+#define DEFAULT_COMMAND_LINE "root=98:0"
+
+/* Changed in linux_main and setup_arch, which run before SMP is started */
+char command_line[COMMAND_LINE_SIZE] = { 0 };
+
+void add_arg(char *arg)
+{
+ if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
+ printf("add_arg: Too many command line arguments!\n");
+ exit(1);
+ }
+ if(strlen(command_line) > 0)
+ strcat(command_line, " ");
+ strcat(command_line, arg);
+}
+
+struct cpuinfo_um boot_cpu_data = {
+ .loops_per_jiffy = 0,
+ .ipi_pipe = { -1, -1 }
+};
+
+unsigned long thread_saved_pc(struct task_struct *task)
+{
+ return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
+ task)));
+}
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ int index = 0;
+
+#ifdef CONFIG_SMP
+ index = (struct cpuinfo_um *) v - cpu_data;
+ if (!cpu_online(index))
+ return 0;
+#endif
+
+ seq_printf(m, "processor\t: %d\n", index);
+ seq_printf(m, "vendor_id\t: User Mode Linux\n");
+ seq_printf(m, "model name\t: UML\n");
+ seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
+ seq_printf(m, "host\t\t: %s\n", host_info);
+ seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
+ loops_per_jiffy/(500000/HZ),
+ (loops_per_jiffy/(5000/HZ)) % 100);
+
+ return(0);
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos < NR_CPUS ? cpu_data + *pos : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_cpuinfo,
+};
+
+pte_t * __bad_pagetable(void)
+{
+ panic("Someone should implement __bad_pagetable");
+ return(NULL);
+}
+
+/* Set in linux_main */
+unsigned long host_task_size;
+unsigned long task_size;
+
+unsigned long uml_start;
+
+/* Set in early boot */
+unsigned long uml_physmem;
+unsigned long uml_reserved;
+unsigned long start_vm;
+unsigned long end_vm;
+int ncpus = 1;
+
+#ifdef CONFIG_MODE_TT
+/* Pointer set in linux_main, the array itself is private to each thread,
+ * and changed at address space creation time so this poses no concurrency
+ * problems.
+ */
+static char *argv1_begin = NULL;
+static char *argv1_end = NULL;
+#endif
+
+/* Set in early boot */
+static int have_root __initdata = 0;
+long physmem_size = 32 * 1024 * 1024;
+
+void set_cmdline(char *cmd)
+{
+#ifdef CONFIG_MODE_TT
+ char *umid, *ptr;
+
+ if(CHOOSE_MODE(honeypot, 0)) return;
+
+ umid = get_umid(1);
+ if(umid != NULL){
+ snprintf(argv1_begin,
+ (argv1_end - argv1_begin) * sizeof(*ptr),
+ "(%s) ", umid);
+ ptr = &argv1_begin[strlen(argv1_begin)];
+ }
+ else ptr = argv1_begin;
+
+ snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
+ memset(argv1_begin + strlen(argv1_begin), '\0',
+ argv1_end - argv1_begin - strlen(argv1_begin));
+#endif
+}
+
+static char *usage_string =
+"User Mode Linux v%s\n"
+" available at http://user-mode-linux.sourceforge.net/\n\n";
+
+static int __init uml_version_setup(char *line, int *add)
+{
+ printf("%s\n", system_utsname.release);
+ exit(0);
+
+ return 0;
+}
+
+__uml_setup("--version", uml_version_setup,
+"--version\n"
+" Prints the version number of the kernel.\n\n"
+);
+
+static int __init uml_root_setup(char *line, int *add)
+{
+ have_root = 1;
+ return 0;
+}
+
+__uml_setup("root=", uml_root_setup,
+"root=<file containing the root fs>\n"
+" This is actually used by the generic kernel in exactly the same\n"
+" way as in any other kernel. If you configure a number of block\n"
+" devices and want to boot off something other than ubd0, you \n"
+" would use something like:\n"
+" root=/dev/ubd5\n\n"
+);
+
+#ifdef CONFIG_SMP
+static int __init uml_ncpus_setup(char *line, int *add)
+{
+ if (!sscanf(line, "%d", &ncpus)) {
+ printf("Couldn't parse [%s]\n", line);
+ return -1;
+ }
+
+ return 0;
+}
+
+__uml_setup("ncpus=", uml_ncpus_setup,
+"ncpus=<# of desired CPUs>\n"
+" This tells an SMP kernel how many virtual processors to start.\n\n"
+);
+#endif
+
+static int force_tt = 0;
+
+#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
+#define DEFAULT_TT 0
+
+static int __init mode_tt_setup(char *line, int *add)
+{
+ force_tt = 1;
+ return(0);
+}
+
+#else
+#ifdef CONFIG_MODE_SKAS
+
+#define DEFAULT_TT 0
+
+static int __init mode_tt_setup(char *line, int *add)
+{
+ printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
+ return(0);
+}
+
+#else
+#ifdef CONFIG_MODE_TT
+
+#define DEFAULT_TT 1
+
+static int __init mode_tt_setup(char *line, int *add)
+{
+ printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
+ return(0);
+}
+
+#else
+
+#error Either CONFIG_MODE_TT or CONFIG_MODE_SKAS must be enabled
+
+#endif
+#endif
+#endif
+
+__uml_setup("mode=tt", mode_tt_setup,
+"mode=tt\n"
+" When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
+" forces UML to run in tt (tracing thread) mode. It is not the default\n"
+" because it's slower and less secure than skas mode.\n\n"
+);
+
+int mode_tt = DEFAULT_TT;
+
+static int __init Usage(char *line, int *add)
+{
+ const char **p;
+
+ printf(usage_string, system_utsname.release);
+ p = &__uml_help_start;
+ while (p < &__uml_help_end) {
+ printf("%s", *p);
+ p++;
+ }
+ exit(0);
+
+ return 0;
+}
+
+__uml_setup("--help", Usage,
+"--help\n"
+" Prints this message.\n\n"
+);
+
+static int __init uml_checksetup(char *line, int *add)
+{
+ struct uml_param *p;
+
+ p = &__uml_setup_start;
+ while(p < &__uml_setup_end) {
+ int n;
+
+ n = strlen(p->str);
+ if(!strncmp(line, p->str, n)){
+ if (p->setup_func(line + n, add)) return 1;
+ }
+ p++;
+ }
+ return 0;
+}
+
+static void __init uml_postsetup(void)
+{
+ initcall_t *p;
+
+ p = &__uml_postsetup_start;
+ while(p < &__uml_postsetup_end){
+ (*p)();
+ p++;
+ }
+ return;
+}
+
+/* Set during early boot */
+unsigned long brk_start;
+unsigned long end_iomem;
+EXPORT_SYMBOL(end_iomem);
+
+#define MIN_VMALLOC (32 * 1024 * 1024)
+
+int linux_main(int argc, char **argv)
+{
+ unsigned long avail, diff;
+ unsigned long virtmem_size, max_physmem;
+ unsigned int i, add;
+
+ for (i = 1; i < argc; i++){
+ if((i == 1) && (argv[i][0] == ' ')) continue;
+ add = 1;
+ uml_checksetup(argv[i], &add);
+ if (add)
+ add_arg(argv[i]);
+ }
+ if(have_root == 0)
+ add_arg(DEFAULT_COMMAND_LINE);
+
+ mode_tt = force_tt ? 1 : !can_do_skas();
+#ifndef CONFIG_MODE_TT
+ if (mode_tt) {
+ /*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
+ * can_do_skas() returned 0, and the message is correct. */
+ printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
+ exit(1);
+ }
+#endif
+ uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
+ &host_task_size, &task_size);
+
+ /* Need to check this early because mmapping happens before the
+ * kernel is running.
+ */
+ check_tmpexec();
+
+ brk_start = (unsigned long) sbrk(0);
+ CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
+ /* Increase physical memory size for exec-shield users
+ so they actually get what they asked for. This should
+ add zero for non-exec shield users */
+
+ diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
+ if(diff > 1024 * 1024){
+ printf("Adding %ld bytes to physical memory to account for "
+ "exec-shield gap\n", diff);
+ physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
+ }
+
+ uml_physmem = uml_start;
+
+ /* Reserve up to 4M after the current brk */
+ uml_reserved = ROUND_4M(brk_start) + (1 << 22);
+
+ setup_machinename(system_utsname.machine);
+
+#ifdef CONFIG_MODE_TT
+ argv1_begin = argv[1];
+ argv1_end = &argv[1][strlen(argv[1])];
+#endif
+
+ highmem = 0;
+ iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
+ max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
+
+ /* Zones have to begin on a 1 << MAX_ORDER page boundary,
+ * so this makes sure that's true for highmem
+ */
+ max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
+ if(physmem_size + iomem_size > max_physmem){
+ highmem = physmem_size + iomem_size - max_physmem;
+ physmem_size -= highmem;
+#ifndef CONFIG_HIGHMEM
+ highmem = 0;
+ printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
+ "to %ld bytes\n", physmem_size);
+#endif
+ }
+
+ high_physmem = uml_physmem + physmem_size;
+ end_iomem = high_physmem + iomem_size;
+ high_memory = (void *) end_iomem;
+
+ start_vm = VMALLOC_START;
+
+ setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
+ if(init_maps(physmem_size, iomem_size, highmem)){
+ printf("Failed to allocate mem_map for %ld bytes of physical "
+ "memory and %ld bytes of highmem\n", physmem_size,
+ highmem);
+ exit(1);
+ }
+
+ virtmem_size = physmem_size;
+ avail = get_kmem_end() - start_vm;
+ if(physmem_size > avail) virtmem_size = avail;
+ end_vm = start_vm + virtmem_size;
+
+ if(virtmem_size < physmem_size)
+ printf("Kernel virtual memory size shrunk to %ld bytes\n",
+ virtmem_size);
+
+ uml_postsetup();
+
+ task_protections((unsigned long) &init_thread_info);
+ os_flush_stdout();
+
+ return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
+}
+
+extern int uml_exitcode;
+
+static int panic_exit(struct notifier_block *self, unsigned long unused1,
+ void *unused2)
+{
+ bust_spinlocks(1);
+ show_regs(&(current->thread.regs));
+ bust_spinlocks(0);
+ uml_exitcode = 1;
+ machine_halt();
+ return(0);
+}
+
+static struct notifier_block panic_exit_notifier = {
+ .notifier_call = panic_exit,
+ .next = NULL,
+ .priority = 0
+};
+
+void __init setup_arch(char **cmdline_p)
+{
+ notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
+ paging_init();
+ strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+ *cmdline_p = command_line;
+ setup_hostinfo();
+}
+
+void __init check_bugs(void)
+{
+ arch_check_bugs();
+ check_ptrace();
+ check_sigio();
+ check_devanon();
+}
+
+void apply_alternatives(void *start, void *end)
+{
+}
diff --git a/arch/um/kernel/umid.c b/arch/um/kernel/umid.c
new file mode 100644
index 0000000..186c288
--- /dev/null
+++ b/arch/um/kernel/umid.c
@@ -0,0 +1,325 @@
+/*
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include "user.h"
+#include "umid.h"
+#include "init.h"
+#include "os.h"
+#include "user_util.h"
+#include "choose-mode.h"
+
+#define UMID_LEN 64
+#define UML_DIR "~/.uml/"
+
+/* Changed by set_umid and make_umid, which are run early in boot */
+static char umid[UMID_LEN] = { 0 };
+
+/* Changed by set_uml_dir and make_uml_dir, which are run early in boot */
+static char *uml_dir = UML_DIR;
+
+/* Changed by set_umid */
+static int umid_is_random = 1;
+static int umid_inited = 0;
+
+static int make_umid(int (*printer)(const char *fmt, ...));
+
+static int __init set_umid(char *name, int is_random,
+ int (*printer)(const char *fmt, ...))
+{
+ if(umid_inited){
+ (*printer)("Unique machine name can't be set twice\n");
+ return(-1);
+ }
+
+ if(strlen(name) > UMID_LEN - 1)
+ (*printer)("Unique machine name is being truncated to %d "
+ "characters\n", UMID_LEN);
+ strlcpy(umid, name, sizeof(umid));
+
+ umid_is_random = is_random;
+ umid_inited = 1;
+ return 0;
+}
+
+static int __init set_umid_arg(char *name, int *add)
+{
+ *add = 0;
+ return(set_umid(name, 0, printf));
+}
+
+__uml_setup("umid=", set_umid_arg,
+"umid=<name>\n"
+" This is used to assign a unique identity to this UML machine and\n"
+" is used for naming the pid file and management console socket.\n\n"
+);
+
+int __init umid_file_name(char *name, char *buf, int len)
+{
+ int n;
+
+ if(!umid_inited && make_umid(printk)) return(-1);
+
+ n = strlen(uml_dir) + strlen(umid) + strlen(name) + 1;
+ if(n > len){
+ printk("umid_file_name : buffer too short\n");
+ return(-1);
+ }
+
+ sprintf(buf, "%s%s/%s", uml_dir, umid, name);
+ return(0);
+}
+
+extern int tracing_pid;
+
+static int __init create_pid_file(void)
+{
+ char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
+ char pid[sizeof("nnnnn\0")];
+ int fd, n;
+
+ if(umid_file_name("pid", file, sizeof(file))) return 0;
+
+ fd = os_open_file(file, of_create(of_excl(of_rdwr(OPENFLAGS()))),
+ 0644);
+ if(fd < 0){
+ printf("Open of machine pid file \"%s\" failed: %s\n",
+ file, strerror(-fd));
+ return 0;
+ }
+
+ sprintf(pid, "%d\n", os_getpid());
+ n = os_write_file(fd, pid, strlen(pid));
+ if(n != strlen(pid))
+ printf("Write of pid file failed - err = %d\n", -n);
+ os_close_file(fd);
+ return 0;
+}
+
+static int actually_do_remove(char *dir)
+{
+ DIR *directory;
+ struct dirent *ent;
+ int len;
+ char file[256];
+
+ directory = opendir(dir);
+ if(directory == NULL){
+ printk("actually_do_remove : couldn't open directory '%s', "
+ "errno = %d\n", dir, errno);
+ return(1);
+ }
+ while((ent = readdir(directory)) != NULL){
+ if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
+ continue;
+ len = strlen(dir) + sizeof("/") + strlen(ent->d_name) + 1;
+ if(len > sizeof(file)){
+ printk("Not deleting '%s' from '%s' - name too long\n",
+ ent->d_name, dir);
+ continue;
+ }
+ sprintf(file, "%s/%s", dir, ent->d_name);
+ if(unlink(file) < 0){
+ printk("actually_do_remove : couldn't remove '%s' "
+ "from '%s', errno = %d\n", ent->d_name, dir,
+ errno);
+ return(1);
+ }
+ }
+ if(rmdir(dir) < 0){
+ printk("actually_do_remove : couldn't rmdir '%s', "
+ "errno = %d\n", dir, errno);
+ return(1);
+ }
+ return(0);
+}
+
+void remove_umid_dir(void)
+{
+ char dir[strlen(uml_dir) + UMID_LEN + 1];
+ if(!umid_inited) return;
+
+ sprintf(dir, "%s%s", uml_dir, umid);
+ actually_do_remove(dir);
+}
+
+char *get_umid(int only_if_set)
+{
+ if(only_if_set && umid_is_random) return(NULL);
+ return(umid);
+}
+
+int not_dead_yet(char *dir)
+{
+ char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
+ char pid[sizeof("nnnnn\0")], *end;
+ int dead, fd, p, n;
+
+ sprintf(file, "%s/pid", dir);
+ dead = 0;
+ fd = os_open_file(file, of_read(OPENFLAGS()), 0);
+ if(fd < 0){
+ if(fd != -ENOENT){
+ printk("not_dead_yet : couldn't open pid file '%s', "
+ "err = %d\n", file, -fd);
+ return(1);
+ }
+ dead = 1;
+ }
+ if(fd > 0){
+ n = os_read_file(fd, pid, sizeof(pid));
+ if(n < 0){
+ printk("not_dead_yet : couldn't read pid file '%s', "
+ "err = %d\n", file, -n);
+ return(1);
+ }
+ p = strtoul(pid, &end, 0);
+ if(end == pid){
+ printk("not_dead_yet : couldn't parse pid file '%s', "
+ "errno = %d\n", file, errno);
+ dead = 1;
+ }
+ if(((kill(p, 0) < 0) && (errno == ESRCH)) ||
+ (p == CHOOSE_MODE(tracing_pid, os_getpid())))
+ dead = 1;
+ }
+ if(!dead) return(1);
+ return(actually_do_remove(dir));
+}
+
+static int __init set_uml_dir(char *name, int *add)
+{
+ if((strlen(name) > 0) && (name[strlen(name) - 1] != '/')){
+ uml_dir = malloc(strlen(name) + 2);
+ if(uml_dir == NULL){
+ printf("Failed to malloc uml_dir - error = %d\n",
+ errno);
+ uml_dir = name;
+ /* Return 0 here because do_initcalls doesn't look at
+ * the return value.
+ */
+ return(0);
+ }
+ sprintf(uml_dir, "%s/", name);
+ }
+ else uml_dir = name;
+ return(0);
+}
+
+static int __init make_uml_dir(void)
+{
+ char dir[MAXPATHLEN + 1] = { '\0' };
+ int len;
+
+ if(*uml_dir == '~'){
+ char *home = getenv("HOME");
+
+ if(home == NULL){
+ printf("make_uml_dir : no value in environment for "
+ "$HOME\n");
+ exit(1);
+ }
+ strlcpy(dir, home, sizeof(dir));
+ uml_dir++;
+ }
+ len = strlen(dir);
+ strncat(dir, uml_dir, sizeof(dir) - len);
+ len = strlen(dir);
+ if((len > 0) && (len < sizeof(dir) - 1) && (dir[len - 1] != '/')){
+ dir[len] = '/';
+ dir[len + 1] = '\0';
+ }
+
+ uml_dir = malloc(strlen(dir) + 1);
+ if(uml_dir == NULL){
+ printf("make_uml_dir : malloc failed, errno = %d\n", errno);
+ exit(1);
+ }
+ strcpy(uml_dir, dir);
+
+ if((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)){
+ printf("Failed to mkdir %s: %s\n", uml_dir, strerror(errno));
+ return(-1);
+ }
+ return 0;
+}
+
+static int __init make_umid(int (*printer)(const char *fmt, ...))
+{
+ int fd, err;
+ char tmp[strlen(uml_dir) + UMID_LEN + 1];
+
+ strlcpy(tmp, uml_dir, sizeof(tmp));
+
+ if(!umid_inited){
+ strcat(tmp, "XXXXXX");
+ fd = mkstemp(tmp);
+ if(fd < 0){
+ (*printer)("make_umid - mkstemp(%s) failed: %s\n",
+ tmp,strerror(errno));
+ return(1);
+ }
+
+ os_close_file(fd);
+ /* There's a nice tiny little race between this unlink and
+ * the mkdir below. It'd be nice if there were a mkstemp
+ * for directories.
+ */
+ unlink(tmp);
+ set_umid(&tmp[strlen(uml_dir)], 1, printer);
+ }
+
+ sprintf(tmp, "%s%s", uml_dir, umid);
+
+ err = mkdir(tmp, 0777);
+ if(err < 0){
+ if(errno == EEXIST){
+ if(not_dead_yet(tmp)){
+ (*printer)("umid '%s' is in use\n", umid);
+ return(-1);
+ }
+ err = mkdir(tmp, 0777);
+ }
+ }
+ if(err < 0){
+ (*printer)("Failed to create %s - errno = %d\n", umid, errno);
+ return(-1);
+ }
+
+ return(0);
+}
+
+__uml_setup("uml_dir=", set_uml_dir,
+"uml_dir=<directory>\n"
+" The location to place the pid and umid files.\n\n"
+);
+
+static int __init make_umid_setup(void)
+{
+ /* one function with the ordering we need ... */
+ make_uml_dir();
+ make_umid(printf);
+ return create_pid_file();
+}
+__uml_postsetup(make_umid_setup);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
new file mode 100644
index 0000000..76eadb3
--- /dev/null
+++ b/arch/um/kernel/uml.lds.S
@@ -0,0 +1,106 @@
+#include <asm-generic/vmlinux.lds.h>
+
+OUTPUT_FORMAT(ELF_FORMAT)
+OUTPUT_ARCH(ELF_ARCH)
+ENTRY(_start)
+jiffies = jiffies_64;
+
+SECTIONS
+{
+ /*This must contain the right address - not quite the default ELF one.*/
+ PROVIDE (__executable_start = START);
+ . = START + SIZEOF_HEADERS;
+
+ /* Used in arch/um/kernel/mem.c. Any memory between START and __binary_start
+ * is remapped.*/
+ __binary_start = .;
+#ifdef MODE_TT
+ .thread_private : {
+ __start_thread_private = .;
+ errno = .;
+ . += 4;
+ arch/um/kernel/tt/unmap_fin.o (.data)
+ __end_thread_private = .;
+ }
+ . = ALIGN(4096);
+ .remap : { arch/um/kernel/tt/unmap_fin.o (.text) }
+
+ /* We want it only if we are in MODE_TT. In both cases, however, when MODE_TT
+ * is off the resulting binary segfaults.*/
+
+ . = ALIGN(4096); /* Init code and data */
+#endif
+
+ _stext = .;
+ __init_begin = .;
+ .init.text : {
+ _sinittext = .;
+ *(.init.text)
+ _einittext = .;
+ }
+ . = ALIGN(4096);
+ .text :
+ {
+ *(.text)
+ SCHED_TEXT
+ LOCK_TEXT
+ *(.fixup)
+ /* .gnu.warning sections are handled specially by elf32.em. */
+ *(.gnu.warning)
+ *(.gnu.linkonce.t*)
+ }
+
+ #include "asm/common.lds.S"
+
+ init.data : { *(init.data) }
+ .data :
+ {
+ . = ALIGN(KERNEL_STACK_SIZE); /* init_task */
+ *(.data.init_task)
+ *(.data)
+ *(.gnu.linkonce.d*)
+ CONSTRUCTORS
+ }
+ .data1 : { *(.data1) }
+ .ctors :
+ {
+ *(.ctors)
+ }
+ .dtors :
+ {
+ *(.dtors)
+ }
+
+ .got : { *(.got.plt) *(.got) }
+ .dynamic : { *(.dynamic) }
+ /* We want the small data sections together, so single-instruction offsets
+ can access them all, and initialized data all before uninitialized, so
+ we can shorten the on-disk segment size. */
+ .sdata : { *(.sdata) }
+ _edata = .;
+ PROVIDE (edata = .);
+ . = ALIGN(0x1000);
+ .sbss :
+ {
+ __bss_start = .;
+ PROVIDE(_bss_start = .);
+ *(.sbss)
+ *(.scommon)
+ }
+ .bss :
+ {
+ *(.dynbss)
+ *(.bss)
+ *(COMMON)
+ }
+ _end = . ;
+ PROVIDE (end = .);
+ /* Stabs debugging sections. */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+}
diff --git a/arch/um/kernel/user_util.c b/arch/um/kernel/user_util.c
new file mode 100644
index 0000000..954ff67
--- /dev/null
+++ b/arch/um/kernel/user_util.c
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+#include <setjmp.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/utsname.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include "asm/types.h"
+#include <ctype.h>
+#include <signal.h>
+#include <wait.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <sched.h>
+#include <termios.h>
+#include <string.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "mem_user.h"
+#include "init.h"
+#include "helper.h"
+#include "ptrace_user.h"
+#include "uml-config.h"
+
+void stop(void)
+{
+ while(1) sleep(1000000);
+}
+
+void stack_protections(unsigned long address)
+{
+ int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
+
+ if(mprotect((void *) address, page_size(), prot) < 0)
+ panic("protecting stack failed, errno = %d", errno);
+}
+
+void task_protections(unsigned long address)
+{
+ unsigned long guard = address + page_size();
+ unsigned long stack = guard + page_size();
+ int prot = 0, pages;
+
+#ifdef notdef
+ if(mprotect((void *) stack, page_size(), prot) < 0)
+ panic("protecting guard page failed, errno = %d", errno);
+#endif
+ pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
+ prot = PROT_READ | PROT_WRITE | PROT_EXEC;
+ if(mprotect((void *) stack, pages * page_size(), prot) < 0)
+ panic("protecting stack failed, errno = %d", errno);
+}
+
+int wait_for_stop(int pid, int sig, int cont_type, void *relay)
+{
+ sigset_t *relay_signals = relay;
+ int status, ret;
+
+ while(1){
+ CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED));
+ if((ret < 0) ||
+ !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
+ if(ret < 0){
+ printk("wait failed, errno = %d\n",
+ errno);
+ }
+ else if(WIFEXITED(status))
+ printk("process %d exited with status %d\n",
+ pid, WEXITSTATUS(status));
+ else if(WIFSIGNALED(status))
+ printk("process %d exited with signal %d\n",
+ pid, WTERMSIG(status));
+ else if((WSTOPSIG(status) == SIGVTALRM) ||
+ (WSTOPSIG(status) == SIGALRM) ||
+ (WSTOPSIG(status) == SIGIO) ||
+ (WSTOPSIG(status) == SIGPROF) ||
+ (WSTOPSIG(status) == SIGCHLD) ||
+ (WSTOPSIG(status) == SIGWINCH) ||
+ (WSTOPSIG(status) == SIGINT)){
+ ptrace(cont_type, pid, 0, WSTOPSIG(status));
+ continue;
+ }
+ else if((relay_signals != NULL) &&
+ sigismember(relay_signals, WSTOPSIG(status))){
+ ptrace(cont_type, pid, 0, WSTOPSIG(status));
+ continue;
+ }
+ else printk("process %d stopped with signal %d\n",
+ pid, WSTOPSIG(status));
+ panic("wait_for_stop failed to wait for %d to stop "
+ "with %d\n", pid, sig);
+ }
+ return(status);
+ }
+}
+
+int raw(int fd)
+{
+ struct termios tt;
+ int err;
+
+ CATCH_EINTR(err = tcgetattr(fd, &tt));
+ if (err < 0) {
+ printk("tcgetattr failed, errno = %d\n", errno);
+ return(-errno);
+ }
+
+ cfmakeraw(&tt);
+
+ CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
+ if (err < 0) {
+ printk("tcsetattr failed, errno = %d\n", errno);
+ return(-errno);
+ }
+
+ /* XXX tcsetattr could have applied only some changes
+ * (and cfmakeraw() is a set of changes) */
+ return(0);
+}
+
+void setup_machinename(char *machine_out)
+{
+ struct utsname host;
+
+ uname(&host);
+ strcpy(machine_out, host.machine);
+}
+
+char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
+
+void setup_hostinfo(void)
+{
+ struct utsname host;
+
+ uname(&host);
+ sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
+ host.release, host.version, host.machine);
+}
+
+int setjmp_wrapper(void (*proc)(void *, void *), ...)
+{
+ va_list args;
+ sigjmp_buf buf;
+ int n;
+
+ n = sigsetjmp(buf, 1);
+ if(n == 0){
+ va_start(args, proc);
+ (*proc)(&buf, &args);
+ }
+ va_end(args);
+ return(n);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
