| ############################################################################### |
| # |
| # MN10300 Exception and interrupt entry points |
| # |
| # Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. |
| # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| # Modified by David Howells (dhowells@redhat.com) |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU General Public Licence |
| # as published by the Free Software Foundation; either version |
| # 2 of the Licence, or (at your option) any later version. |
| # |
| ############################################################################### |
| #include <linux/sys.h> |
| #include <linux/linkage.h> |
| #include <asm/smp.h> |
| #include <asm/system.h> |
| #include <asm/irqflags.h> |
| #include <asm/thread_info.h> |
| #include <asm/intctl-regs.h> |
| #include <asm/busctl-regs.h> |
| #include <asm/timer-regs.h> |
| #include <unit/leds.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/errno.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/frame.inc> |
| |
| #ifdef CONFIG_PREEMPT |
| #define preempt_stop __cli |
| #else |
| #define preempt_stop |
| #define resume_kernel restore_all |
| #endif |
| |
| .macro __cli |
| and ~EPSW_IM,epsw |
| or EPSW_IE|MN10300_CLI_LEVEL,epsw |
| nop |
| nop |
| nop |
| .endm |
| .macro __sti |
| or EPSW_IE|EPSW_IM_7,epsw |
| .endm |
| |
| |
| .am33_2 |
| |
| ############################################################################### |
| # |
| # the return path for a forked child |
| # - on entry, D0 holds the address of the previous task to run |
| # |
| ############################################################################### |
| ENTRY(ret_from_fork) |
| call schedule_tail[],0 |
| GET_THREAD_INFO a2 |
| |
| # return 0 to indicate child process |
| clr d0 |
| mov d0,(REG_D0,fp) |
| jmp syscall_exit |
| |
| ############################################################################### |
| # |
| # system call handler |
| # |
| ############################################################################### |
| ENTRY(system_call) |
| add -4,sp |
| SAVE_ALL |
| mov d0,(REG_ORIG_D0,fp) |
| GET_THREAD_INFO a2 |
| cmp nr_syscalls,d0 |
| bcc syscall_badsys |
| btst _TIF_SYSCALL_TRACE,(TI_flags,a2) |
| bne syscall_entry_trace |
| syscall_call: |
| add d0,d0,a1 |
| add a1,a1 |
| mov (REG_A0,fp),d0 |
| mov (sys_call_table,a1),a0 |
| calls (a0) |
| mov d0,(REG_D0,fp) |
| syscall_exit: |
| # make sure we don't miss an interrupt setting need_resched or |
| # sigpending between sampling and the rti |
| __cli |
| mov (TI_flags,a2),d2 |
| btst _TIF_ALLWORK_MASK,d2 |
| bne syscall_exit_work |
| restore_all: |
| RESTORE_ALL |
| |
| ############################################################################### |
| # |
| # perform work that needs to be done immediately before resumption and syscall |
| # tracing |
| # |
| ############################################################################### |
| ALIGN |
| syscall_exit_work: |
| btst _TIF_SYSCALL_TRACE,d2 |
| beq work_pending |
| __sti # could let syscall_trace_exit() call |
| # schedule() instead |
| mov fp,d0 |
| call syscall_trace_exit[],0 # do_syscall_trace(regs) |
| jmp resume_userspace |
| |
| ALIGN |
| work_pending: |
| btst _TIF_NEED_RESCHED,d2 |
| beq work_notifysig |
| |
| work_resched: |
| call schedule[],0 |
| |
| # make sure we don't miss an interrupt setting need_resched or |
| # sigpending between sampling and the rti |
| __cli |
| |
| # is there any work to be done other than syscall tracing? |
| mov (TI_flags,a2),d2 |
| btst _TIF_WORK_MASK,d2 |
| beq restore_all |
| btst _TIF_NEED_RESCHED,d2 |
| bne work_resched |
| |
| # deal with pending signals and notify-resume requests |
| work_notifysig: |
| mov fp,d0 |
| mov d2,d1 |
| call do_notify_resume[],0 |
| jmp resume_userspace |
| |
| # perform syscall entry tracing |
| syscall_entry_trace: |
| mov -ENOSYS,d0 |
| mov d0,(REG_D0,fp) |
| mov fp,d0 |
| call syscall_trace_entry[],0 # returns the syscall number to actually use |
| mov (REG_D1,fp),d1 |
| cmp nr_syscalls,d0 |
| bcs syscall_call |
| jmp syscall_exit |
| |
| syscall_badsys: |
| mov -ENOSYS,d0 |
| mov d0,(REG_D0,fp) |
| jmp resume_userspace |
| |
| # userspace resumption stub bypassing syscall exit tracing |
| .globl ret_from_exception, ret_from_intr |
| ALIGN |
| ret_from_exception: |
| preempt_stop |
| ret_from_intr: |
| GET_THREAD_INFO a2 |
| mov (REG_EPSW,fp),d0 # need to deliver signals before |
| # returning to userspace |
| and EPSW_nSL,d0 |
| beq resume_kernel # returning to supervisor mode |
| |
| ENTRY(resume_userspace) |
| # make sure we don't miss an interrupt setting need_resched or |
| # sigpending between sampling and the rti |
| __cli |
| |
| # is there any work to be done on int/exception return? |
| mov (TI_flags,a2),d2 |
| btst _TIF_WORK_MASK,d2 |
| bne work_pending |
| jmp restore_all |
| |
| #ifdef CONFIG_PREEMPT |
| ENTRY(resume_kernel) |
| __cli |
| mov (TI_preempt_count,a2),d0 # non-zero preempt_count ? |
| cmp 0,d0 |
| bne restore_all |
| |
| need_resched: |
| btst _TIF_NEED_RESCHED,(TI_flags,a2) |
| beq restore_all |
| mov (REG_EPSW,fp),d0 |
| and EPSW_IM,d0 |
| cmp EPSW_IM_7,d0 # interrupts off (exception path) ? |
| bne restore_all |
| call preempt_schedule_irq[],0 |
| jmp need_resched |
| #endif |
| |
| |
| ############################################################################### |
| # |
| # IRQ handler entry point |
| # - intended to be entered at multiple priorities |
| # |
| ############################################################################### |
| ENTRY(irq_handler) |
| add -4,sp |
| SAVE_ALL |
| |
| # it's not a syscall |
| mov 0xffffffff,d0 |
| mov d0,(REG_ORIG_D0,fp) |
| |
| mov fp,d0 |
| call do_IRQ[],0 # do_IRQ(regs) |
| |
| jmp ret_from_intr |
| |
| ############################################################################### |
| # |
| # Double Fault handler entry point |
| # - note that there will not be a stack, D0/A0 will hold EPSW/PC as were |
| # |
| ############################################################################### |
| .section .bss |
| .balign THREAD_SIZE |
| .space THREAD_SIZE |
| __df_stack: |
| .previous |
| |
| ENTRY(double_fault) |
| mov a0,(__df_stack-4) # PC as was |
| mov d0,(__df_stack-8) # EPSW as was |
| mn10300_set_dbfleds # display 'db-f' on the LEDs |
| mov 0xaa55aa55,d0 |
| mov d0,(__df_stack-12) # no ORIG_D0 |
| mov sp,a0 # save corrupted SP |
| mov __df_stack-12,sp # emergency supervisor stack |
| SAVE_ALL |
| mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got |
| # clobbered by the CPU) |
| mov fp,d0 |
| calls do_double_fault |
| double_fault_loop: |
| bra double_fault_loop |
| |
| ############################################################################### |
| # |
| # Bus Error handler entry point |
| # - handle external (async) bus errors separately |
| # |
| ############################################################################### |
| ENTRY(raw_bus_error) |
| add -4,sp |
| mov d0,(sp) |
| mov (BCBERR),d0 # what |
| btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error |
| beq __common_exception_aux # it wasn't |
| |
| SAVE_ALL |
| mov (BCBEAR),d1 # destination of erroneous access |
| |
| mov (REG_ORIG_D0,fp),d2 |
| mov d2,(REG_D0,fp) |
| mov -1,d2 |
| mov d2,(REG_ORIG_D0,fp) |
| |
| add -4,sp |
| mov fp,(12,sp) # frame pointer |
| call io_bus_error[],0 |
| jmp restore_all |
| |
| ############################################################################### |
| # |
| # Miscellaneous exception entry points |
| # |
| ############################################################################### |
| ENTRY(nmi_handler) |
| add -4,sp |
| mov d0,(sp) |
| mov (TBR),d0 |
| bra __common_exception_nonmi |
| |
| ENTRY(__common_exception) |
| add -4,sp |
| mov d0,(sp) |
| |
| __common_exception_aux: |
| mov (TBR),d0 |
| and ~EPSW_NMID,epsw # turn NMIs back on if not NMI |
| or EPSW_IE,epsw |
| |
| __common_exception_nonmi: |
| and 0x0000FFFF,d0 # turn the exception code into a vector |
| # table index |
| |
| btst 0x00000007,d0 |
| bne 1f |
| cmp 0x00000400,d0 |
| bge 1f |
| |
| SAVE_ALL # build the stack frame |
| |
| mov (REG_D0,fp),a2 # get the exception number |
| mov (REG_ORIG_D0,fp),d0 |
| mov d0,(REG_D0,fp) |
| mov -1,d0 |
| mov d0,(REG_ORIG_D0,fp) |
| |
| #ifdef CONFIG_GDBSTUB |
| btst 0x01,(gdbstub_busy) |
| beq 2f |
| and ~EPSW_IE,epsw |
| mov fp,d0 |
| mov a2,d1 |
| call gdbstub_exception[],0 # gdbstub itself caused an exception |
| bra restore_all |
| 2: |
| #endif |
| |
| mov fp,d0 # arg 0: stacked register file |
| mov a2,d1 # arg 1: exception number |
| lsr 1,a2 |
| |
| mov (exception_table,a2),a2 |
| calls (a2) |
| jmp ret_from_exception |
| |
| 1: pi # BUG() equivalent |
| |
| ############################################################################### |
| # |
| # Exception handler functions table |
| # |
| ############################################################################### |
| .data |
| ENTRY(exception_table) |
| .rept 0x400>>1 |
| .long uninitialised_exception |
| .endr |
| .previous |
| |
| ############################################################################### |
| # |
| # Change an entry in the exception table |
| # - D0 exception code, D1 handler |
| # |
| ############################################################################### |
| ENTRY(set_excp_vector) |
| lsr 1,d0 |
| add exception_table,d0 |
| mov d1,(d0) |
| mov 4,d1 |
| #if defined(CONFIG_MN10300_CACHE_WBACK) |
| jmp mn10300_dcache_flush_inv_range2 |
| #else |
| ret [],0 |
| #endif |
| |
| ############################################################################### |
| # |
| # System call table |
| # |
| ############################################################################### |
| .data |
| ENTRY(sys_call_table) |
| .long sys_restart_syscall /* 0 */ |
| .long sys_exit |
| .long sys_fork |
| .long sys_read |
| .long sys_write |
| .long sys_open /* 5 */ |
| .long sys_close |
| .long sys_waitpid |
| .long sys_creat |
| .long sys_link |
| .long sys_unlink /* 10 */ |
| .long sys_execve |
| .long sys_chdir |
| .long sys_time |
| .long sys_mknod |
| .long sys_chmod /* 15 */ |
| .long sys_lchown16 |
| .long sys_ni_syscall /* old break syscall holder */ |
| .long sys_stat |
| .long sys_lseek |
| .long sys_getpid /* 20 */ |
| .long sys_mount |
| .long sys_oldumount |
| .long sys_setuid16 |
| .long sys_getuid16 |
| .long sys_stime /* 25 */ |
| .long sys_ptrace |
| .long sys_alarm |
| .long sys_fstat |
| .long sys_pause |
| .long sys_utime /* 30 */ |
| .long sys_ni_syscall /* old stty syscall holder */ |
| .long sys_ni_syscall /* old gtty syscall holder */ |
| .long sys_access |
| .long sys_nice |
| .long sys_ni_syscall /* 35 - old ftime syscall holder */ |
| .long sys_sync |
| .long sys_kill |
| .long sys_rename |
| .long sys_mkdir |
| .long sys_rmdir /* 40 */ |
| .long sys_dup |
| .long sys_pipe |
| .long sys_times |
| .long sys_ni_syscall /* old prof syscall holder */ |
| .long sys_brk /* 45 */ |
| .long sys_setgid16 |
| .long sys_getgid16 |
| .long sys_signal |
| .long sys_geteuid16 |
| .long sys_getegid16 /* 50 */ |
| .long sys_acct |
| .long sys_umount /* recycled never used phys() */ |
| .long sys_ni_syscall /* old lock syscall holder */ |
| .long sys_ioctl |
| .long sys_fcntl /* 55 */ |
| .long sys_ni_syscall /* old mpx syscall holder */ |
| .long sys_setpgid |
| .long sys_ni_syscall /* old ulimit syscall holder */ |
| .long sys_ni_syscall /* old sys_olduname */ |
| .long sys_umask /* 60 */ |
| .long sys_chroot |
| .long sys_ustat |
| .long sys_dup2 |
| .long sys_getppid |
| .long sys_getpgrp /* 65 */ |
| .long sys_setsid |
| .long sys_sigaction |
| .long sys_sgetmask |
| .long sys_ssetmask |
| .long sys_setreuid16 /* 70 */ |
| .long sys_setregid16 |
| .long sys_sigsuspend |
| .long sys_sigpending |
| .long sys_sethostname |
| .long sys_setrlimit /* 75 */ |
| .long sys_old_getrlimit |
| .long sys_getrusage |
| .long sys_gettimeofday |
| .long sys_settimeofday |
| .long sys_getgroups16 /* 80 */ |
| .long sys_setgroups16 |
| .long sys_old_select |
| .long sys_symlink |
| .long sys_lstat |
| .long sys_readlink /* 85 */ |
| .long sys_uselib |
| .long sys_swapon |
| .long sys_reboot |
| .long sys_old_readdir |
| .long old_mmap /* 90 */ |
| .long sys_munmap |
| .long sys_truncate |
| .long sys_ftruncate |
| .long sys_fchmod |
| .long sys_fchown16 /* 95 */ |
| .long sys_getpriority |
| .long sys_setpriority |
| .long sys_ni_syscall /* old profil syscall holder */ |
| .long sys_statfs |
| .long sys_fstatfs /* 100 */ |
| .long sys_ni_syscall /* ioperm */ |
| .long sys_socketcall |
| .long sys_syslog |
| .long sys_setitimer |
| .long sys_getitimer /* 105 */ |
| .long sys_newstat |
| .long sys_newlstat |
| .long sys_newfstat |
| .long sys_ni_syscall /* old sys_uname */ |
| .long sys_ni_syscall /* 110 - iopl */ |
| .long sys_vhangup |
| .long sys_ni_syscall /* old "idle" system call */ |
| .long sys_ni_syscall /* vm86old */ |
| .long sys_wait4 |
| .long sys_swapoff /* 115 */ |
| .long sys_sysinfo |
| .long sys_ipc |
| .long sys_fsync |
| .long sys_sigreturn |
| .long sys_clone /* 120 */ |
| .long sys_setdomainname |
| .long sys_newuname |
| .long sys_ni_syscall /* modify_ldt */ |
| .long sys_adjtimex |
| .long sys_mprotect /* 125 */ |
| .long sys_sigprocmask |
| .long sys_ni_syscall /* old "create_module" */ |
| .long sys_init_module |
| .long sys_delete_module |
| .long sys_ni_syscall /* 130: old "get_kernel_syms" */ |
| .long sys_quotactl |
| .long sys_getpgid |
| .long sys_fchdir |
| .long sys_bdflush |
| .long sys_sysfs /* 135 */ |
| .long sys_personality |
| .long sys_ni_syscall /* reserved for afs_syscall */ |
| .long sys_setfsuid16 |
| .long sys_setfsgid16 |
| .long sys_llseek /* 140 */ |
| .long sys_getdents |
| .long sys_select |
| .long sys_flock |
| .long sys_msync |
| .long sys_readv /* 145 */ |
| .long sys_writev |
| .long sys_getsid |
| .long sys_fdatasync |
| .long sys_sysctl |
| .long sys_mlock /* 150 */ |
| .long sys_munlock |
| .long sys_mlockall |
| .long sys_munlockall |
| .long sys_sched_setparam |
| .long sys_sched_getparam /* 155 */ |
| .long sys_sched_setscheduler |
| .long sys_sched_getscheduler |
| .long sys_sched_yield |
| .long sys_sched_get_priority_max |
| .long sys_sched_get_priority_min /* 160 */ |
| .long sys_sched_rr_get_interval |
| .long sys_nanosleep |
| .long sys_mremap |
| .long sys_setresuid16 |
| .long sys_getresuid16 /* 165 */ |
| .long sys_ni_syscall /* vm86 */ |
| .long sys_ni_syscall /* Old sys_query_module */ |
| .long sys_poll |
| .long sys_nfsservctl |
| .long sys_setresgid16 /* 170 */ |
| .long sys_getresgid16 |
| .long sys_prctl |
| .long sys_rt_sigreturn |
| .long sys_rt_sigaction |
| .long sys_rt_sigprocmask /* 175 */ |
| .long sys_rt_sigpending |
| .long sys_rt_sigtimedwait |
| .long sys_rt_sigqueueinfo |
| .long sys_rt_sigsuspend |
| .long sys_pread64 /* 180 */ |
| .long sys_pwrite64 |
| .long sys_chown16 |
| .long sys_getcwd |
| .long sys_capget |
| .long sys_capset /* 185 */ |
| .long sys_sigaltstack |
| .long sys_sendfile |
| .long sys_ni_syscall /* reserved for streams1 */ |
| .long sys_ni_syscall /* reserved for streams2 */ |
| .long sys_vfork /* 190 */ |
| .long sys_getrlimit |
| .long sys_mmap_pgoff |
| .long sys_truncate64 |
| .long sys_ftruncate64 |
| .long sys_stat64 /* 195 */ |
| .long sys_lstat64 |
| .long sys_fstat64 |
| .long sys_lchown |
| .long sys_getuid |
| .long sys_getgid /* 200 */ |
| .long sys_geteuid |
| .long sys_getegid |
| .long sys_setreuid |
| .long sys_setregid |
| .long sys_getgroups /* 205 */ |
| .long sys_setgroups |
| .long sys_fchown |
| .long sys_setresuid |
| .long sys_getresuid |
| .long sys_setresgid /* 210 */ |
| .long sys_getresgid |
| .long sys_chown |
| .long sys_setuid |
| .long sys_setgid |
| .long sys_setfsuid /* 215 */ |
| .long sys_setfsgid |
| .long sys_pivot_root |
| .long sys_mincore |
| .long sys_madvise |
| .long sys_getdents64 /* 220 */ |
| .long sys_fcntl64 |
| .long sys_ni_syscall /* reserved for TUX */ |
| .long sys_ni_syscall |
| .long sys_gettid |
| .long sys_readahead /* 225 */ |
| .long sys_setxattr |
| .long sys_lsetxattr |
| .long sys_fsetxattr |
| .long sys_getxattr |
| .long sys_lgetxattr /* 230 */ |
| .long sys_fgetxattr |
| .long sys_listxattr |
| .long sys_llistxattr |
| .long sys_flistxattr |
| .long sys_removexattr /* 235 */ |
| .long sys_lremovexattr |
| .long sys_fremovexattr |
| .long sys_tkill |
| .long sys_sendfile64 |
| .long sys_futex /* 240 */ |
| .long sys_sched_setaffinity |
| .long sys_sched_getaffinity |
| .long sys_ni_syscall /* sys_set_thread_area */ |
| .long sys_ni_syscall /* sys_get_thread_area */ |
| .long sys_io_setup /* 245 */ |
| .long sys_io_destroy |
| .long sys_io_getevents |
| .long sys_io_submit |
| .long sys_io_cancel |
| .long sys_fadvise64 /* 250 */ |
| .long sys_ni_syscall |
| .long sys_exit_group |
| .long sys_lookup_dcookie |
| .long sys_epoll_create |
| .long sys_epoll_ctl /* 255 */ |
| .long sys_epoll_wait |
| .long sys_remap_file_pages |
| .long sys_set_tid_address |
| .long sys_timer_create |
| .long sys_timer_settime /* 260 */ |
| .long sys_timer_gettime |
| .long sys_timer_getoverrun |
| .long sys_timer_delete |
| .long sys_clock_settime |
| .long sys_clock_gettime /* 265 */ |
| .long sys_clock_getres |
| .long sys_clock_nanosleep |
| .long sys_statfs64 |
| .long sys_fstatfs64 |
| .long sys_tgkill /* 270 */ |
| .long sys_utimes |
| .long sys_fadvise64_64 |
| .long sys_ni_syscall /* sys_vserver */ |
| .long sys_mbind |
| .long sys_get_mempolicy /* 275 */ |
| .long sys_set_mempolicy |
| .long sys_mq_open |
| .long sys_mq_unlink |
| .long sys_mq_timedsend |
| .long sys_mq_timedreceive /* 280 */ |
| .long sys_mq_notify |
| .long sys_mq_getsetattr |
| .long sys_kexec_load |
| .long sys_waitid |
| .long sys_ni_syscall /* 285 */ /* available */ |
| .long sys_add_key |
| .long sys_request_key |
| .long sys_keyctl |
| .long sys_cacheflush |
| .long sys_ioprio_set /* 290 */ |
| .long sys_ioprio_get |
| .long sys_inotify_init |
| .long sys_inotify_add_watch |
| .long sys_inotify_rm_watch |
| .long sys_migrate_pages /* 295 */ |
| .long sys_openat |
| .long sys_mkdirat |
| .long sys_mknodat |
| .long sys_fchownat |
| .long sys_futimesat /* 300 */ |
| .long sys_fstatat64 |
| .long sys_unlinkat |
| .long sys_renameat |
| .long sys_linkat |
| .long sys_symlinkat /* 305 */ |
| .long sys_readlinkat |
| .long sys_fchmodat |
| .long sys_faccessat |
| .long sys_pselect6 |
| .long sys_ppoll /* 310 */ |
| .long sys_unshare |
| .long sys_set_robust_list |
| .long sys_get_robust_list |
| .long sys_splice |
| .long sys_sync_file_range /* 315 */ |
| .long sys_tee |
| .long sys_vmsplice |
| .long sys_move_pages |
| .long sys_getcpu |
| .long sys_epoll_pwait /* 320 */ |
| .long sys_utimensat |
| .long sys_signalfd |
| .long sys_timerfd_create |
| .long sys_eventfd |
| .long sys_fallocate /* 325 */ |
| .long sys_timerfd_settime |
| .long sys_timerfd_gettime |
| .long sys_signalfd4 |
| .long sys_eventfd2 |
| .long sys_epoll_create1 /* 330 */ |
| .long sys_dup3 |
| .long sys_pipe2 |
| .long sys_inotify_init1 |
| .long sys_preadv |
| .long sys_pwritev /* 335 */ |
| .long sys_rt_tgsigqueueinfo |
| .long sys_perf_event_open |
| .long sys_recvmmsg |
| |
| |
| nr_syscalls=(.-sys_call_table)/4 |
