Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle |
| 7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
| 8 | * Copyright (C) 2001 MIPS Technologies, Inc. |
| 9 | */ |
Randy Dunlap | a941564 | 2006-01-11 12:17:48 -0800 | [diff] [blame] | 10 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/errno.h> |
| 12 | #include <linux/linkage.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 13 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/string.h> |
| 17 | #include <linux/syscalls.h> |
| 18 | #include <linux/file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/utsname.h> |
| 20 | #include <linux/unistd.h> |
| 21 | #include <linux/sem.h> |
| 22 | #include <linux/msg.h> |
| 23 | #include <linux/shm.h> |
| 24 | #include <linux/compiler.h> |
Adrian Bunk | cba4fbb | 2007-10-16 23:29:24 -0700 | [diff] [blame] | 25 | #include <linux/ipc.h> |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 26 | #include <linux/uaccess.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
David Daney | 652b14a | 2010-07-19 13:14:57 -0700 | [diff] [blame] | 28 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 30 | #include <asm/asm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <asm/branch.h> |
| 32 | #include <asm/cachectl.h> |
| 33 | #include <asm/cacheflush.h> |
Sam Ravnborg | 048eb58 | 2005-09-09 22:32:31 +0200 | [diff] [blame] | 34 | #include <asm/asm-offsets.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/signal.h> |
| 36 | #include <asm/sim.h> |
| 37 | #include <asm/shmparam.h> |
| 38 | #include <asm/sysmips.h> |
| 39 | #include <asm/uaccess.h> |
David Howells | b81947c | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 40 | #include <asm/switch_to.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Ralf Baechle | 8213bbf | 2008-07-20 13:16:46 +0100 | [diff] [blame] | 42 | /* |
| 43 | * For historic reasons the pipe(2) syscall on MIPS has an unusual calling |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 44 | * convention. It returns results in registers $v0 / $v1 which means there |
Ralf Baechle | 8213bbf | 2008-07-20 13:16:46 +0100 | [diff] [blame] | 45 | * is no need for it to do verify the validity of a userspace pointer |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 46 | * argument. Historically that used to be expensive in Linux. These days |
Ralf Baechle | 8213bbf | 2008-07-20 13:16:46 +0100 | [diff] [blame] | 47 | * the performance advantage is negligible. |
| 48 | */ |
Al Viro | 974fdb3 | 2012-12-23 20:18:28 -0500 | [diff] [blame] | 49 | asmlinkage int sysm_pipe(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
| 51 | int fd[2]; |
Al Viro | 974fdb3 | 2012-12-23 20:18:28 -0500 | [diff] [blame] | 52 | int error = do_pipe_flags(fd, 0); |
| 53 | if (error) |
| 54 | return error; |
| 55 | current_pt_regs()->regs[3] = fd[1]; |
| 56 | return fd[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | } |
| 58 | |
Ralf Baechle | dbda6ac | 2009-02-08 16:00:26 +0000 | [diff] [blame] | 59 | SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, |
| 60 | unsigned long, prot, unsigned long, flags, unsigned long, |
| 61 | fd, off_t, offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
| 63 | unsigned long result; |
| 64 | |
| 65 | result = -EINVAL; |
| 66 | if (offset & ~PAGE_MASK) |
| 67 | goto out; |
| 68 | |
Al Viro | f8b7256 | 2009-11-30 17:37:04 -0500 | [diff] [blame] | 69 | result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
| 71 | out: |
| 72 | return result; |
| 73 | } |
| 74 | |
Ralf Baechle | dbda6ac | 2009-02-08 16:00:26 +0000 | [diff] [blame] | 75 | SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, |
| 76 | unsigned long, prot, unsigned long, flags, unsigned long, fd, |
| 77 | unsigned long, pgoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { |
H. Peter Anvin | 947df17 | 2006-02-24 21:20:29 -0800 | [diff] [blame] | 79 | if (pgoff & (~PAGE_MASK >> 12)) |
| 80 | return -EINVAL; |
| 81 | |
Al Viro | f8b7256 | 2009-11-30 17:37:04 -0500 | [diff] [blame] | 82 | return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | save_static_function(sys_fork); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | save_static_function(sys_clone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Ralf Baechle | dbda6ac | 2009-02-08 16:00:26 +0000 | [diff] [blame] | 88 | SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) |
Ralf Baechle | 3c37026 | 2005-04-13 17:43:59 +0000 | [diff] [blame] | 89 | { |
Al Viro | dc8f602 | 2006-01-12 01:06:07 -0800 | [diff] [blame] | 90 | struct thread_info *ti = task_thread_info(current); |
Ralf Baechle | 3c37026 | 2005-04-13 17:43:59 +0000 | [diff] [blame] | 91 | |
| 92 | ti->tp_value = addr; |
Ralf Baechle | a369202 | 2007-07-10 17:33:02 +0100 | [diff] [blame] | 93 | if (cpu_has_userlocal) |
| 94 | write_c0_userlocal(addr); |
Ralf Baechle | 06be375 | 2006-09-19 17:18:53 +0100 | [diff] [blame] | 95 | |
| 96 | return 0; |
Ralf Baechle | 3c37026 | 2005-04-13 17:43:59 +0000 | [diff] [blame] | 97 | } |
| 98 | |
Ralf Baechle | 12890d0 | 2012-12-27 16:23:12 +0100 | [diff] [blame] | 99 | static inline int mips_atomic_set(unsigned long addr, unsigned long new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 101 | unsigned long old, tmp; |
Ralf Baechle | 12890d0 | 2012-12-27 16:23:12 +0100 | [diff] [blame] | 102 | struct pt_regs *regs; |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 103 | unsigned int err; |
| 104 | |
| 105 | if (unlikely(addr & 3)) |
| 106 | return -EINVAL; |
| 107 | |
| 108 | if (unlikely(!access_ok(VERIFY_WRITE, addr, 4))) |
| 109 | return -EINVAL; |
| 110 | |
| 111 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
| 112 | __asm__ __volatile__ ( |
Ralf Baechle | a809d46 | 2014-03-30 13:20:10 +0200 | [diff] [blame] | 113 | " .set arch=r4000 \n" |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 114 | " li %[err], 0 \n" |
| 115 | "1: ll %[old], (%[addr]) \n" |
| 116 | " move %[tmp], %[new] \n" |
| 117 | "2: sc %[tmp], (%[addr]) \n" |
| 118 | " beqzl %[tmp], 1b \n" |
| 119 | "3: \n" |
Maciej W. Rozycki | 0e525e4 | 2014-11-15 22:09:31 +0000 | [diff] [blame] | 120 | " .insn \n" |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 121 | " .section .fixup,\"ax\" \n" |
| 122 | "4: li %[err], %[efault] \n" |
| 123 | " j 3b \n" |
| 124 | " .previous \n" |
| 125 | " .section __ex_table,\"a\" \n" |
| 126 | " "STR(PTR)" 1b, 4b \n" |
| 127 | " "STR(PTR)" 2b, 4b \n" |
| 128 | " .previous \n" |
Ralf Baechle | a91be9e | 2009-12-02 11:33:03 +0000 | [diff] [blame] | 129 | " .set mips0 \n" |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 130 | : [old] "=&r" (old), |
| 131 | [err] "=&r" (err), |
| 132 | [tmp] "=&r" (tmp) |
| 133 | : [addr] "r" (addr), |
| 134 | [new] "r" (new), |
| 135 | [efault] "i" (-EFAULT) |
| 136 | : "memory"); |
| 137 | } else if (cpu_has_llsc) { |
| 138 | __asm__ __volatile__ ( |
Markos Chandras | fee313d | 2015-01-15 10:34:00 +0000 | [diff] [blame] | 139 | " .set "MIPS_ISA_ARCH_LEVEL" \n" |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 140 | " li %[err], 0 \n" |
| 141 | "1: ll %[old], (%[addr]) \n" |
| 142 | " move %[tmp], %[new] \n" |
| 143 | "2: sc %[tmp], (%[addr]) \n" |
| 144 | " bnez %[tmp], 4f \n" |
| 145 | "3: \n" |
Maciej W. Rozycki | 0e525e4 | 2014-11-15 22:09:31 +0000 | [diff] [blame] | 146 | " .insn \n" |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 147 | " .subsection 2 \n" |
| 148 | "4: b 1b \n" |
| 149 | " .previous \n" |
| 150 | " \n" |
| 151 | " .section .fixup,\"ax\" \n" |
| 152 | "5: li %[err], %[efault] \n" |
| 153 | " j 3b \n" |
| 154 | " .previous \n" |
| 155 | " .section __ex_table,\"a\" \n" |
| 156 | " "STR(PTR)" 1b, 5b \n" |
| 157 | " "STR(PTR)" 2b, 5b \n" |
| 158 | " .previous \n" |
Ralf Baechle | a91be9e | 2009-12-02 11:33:03 +0000 | [diff] [blame] | 159 | " .set mips0 \n" |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 160 | : [old] "=&r" (old), |
| 161 | [err] "=&r" (err), |
| 162 | [tmp] "=&r" (tmp) |
| 163 | : [addr] "r" (addr), |
| 164 | [new] "r" (new), |
| 165 | [efault] "i" (-EFAULT) |
| 166 | : "memory"); |
| 167 | } else { |
| 168 | do { |
| 169 | preempt_disable(); |
| 170 | ll_bit = 1; |
| 171 | ll_task = current; |
| 172 | preempt_enable(); |
| 173 | |
| 174 | err = __get_user(old, (unsigned int *) addr); |
| 175 | err |= __put_user(new, (unsigned int *) addr); |
| 176 | if (err) |
| 177 | break; |
| 178 | rmb(); |
| 179 | } while (!ll_bit); |
| 180 | } |
| 181 | |
| 182 | if (unlikely(err)) |
| 183 | return err; |
| 184 | |
Ralf Baechle | 12890d0 | 2012-12-27 16:23:12 +0100 | [diff] [blame] | 185 | regs = current_pt_regs(); |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 186 | regs->regs[2] = old; |
| 187 | regs->regs[7] = 0; /* No error */ |
| 188 | |
| 189 | /* |
| 190 | * Don't let your children do this ... |
| 191 | */ |
| 192 | __asm__ __volatile__( |
| 193 | " move $29, %0 \n" |
| 194 | " j syscall_exit \n" |
| 195 | : /* no outputs */ |
| 196 | : "r" (regs)); |
| 197 | |
| 198 | /* unreached. Honestly. */ |
Ralf Baechle | f2ace93 | 2012-12-27 13:37:40 +0100 | [diff] [blame] | 199 | unreachable(); |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 200 | } |
| 201 | |
Ralf Baechle | 12890d0 | 2012-12-27 16:23:12 +0100 | [diff] [blame] | 202 | SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) |
Ralf Baechle | f1e39a4 | 2009-09-17 02:25:05 +0200 | [diff] [blame] | 203 | { |
Ralf Baechle | 293c5bd | 2007-07-25 16:19:33 +0100 | [diff] [blame] | 204 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | case MIPS_ATOMIC_SET: |
Ralf Baechle | 12890d0 | 2012-12-27 16:23:12 +0100 | [diff] [blame] | 206 | return mips_atomic_set(arg1, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | case MIPS_FIXADE: |
Ralf Baechle | 293c5bd | 2007-07-25 16:19:33 +0100 | [diff] [blame] | 209 | if (arg1 & ~3) |
| 210 | return -EINVAL; |
| 211 | |
| 212 | if (arg1 & 1) |
| 213 | set_thread_flag(TIF_FIXADE); |
| 214 | else |
| 215 | clear_thread_flag(TIF_FIXADE); |
| 216 | if (arg1 & 2) |
| 217 | set_thread_flag(TIF_LOGADE); |
| 218 | else |
Stefan Oberhumer | e56293b | 2011-01-17 09:19:53 +0100 | [diff] [blame] | 219 | clear_thread_flag(TIF_LOGADE); |
Ralf Baechle | 293c5bd | 2007-07-25 16:19:33 +0100 | [diff] [blame] | 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | return 0; |
| 222 | |
| 223 | case FLUSH_CACHE: |
| 224 | __flush_cache_all(); |
| 225 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | return -EINVAL; |
| 229 | } |
| 230 | |
| 231 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | * No implemented yet ... |
| 233 | */ |
Ralf Baechle | dbda6ac | 2009-02-08 16:00:26 +0000 | [diff] [blame] | 234 | SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | { |
| 236 | return -ENOSYS; |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * If we ever come here the user sp is bad. Zap the process right away. |
| 241 | * Due to the bad stack signaling wouldn't work. |
| 242 | */ |
| 243 | asmlinkage void bad_stack(void) |
| 244 | { |
| 245 | do_exit(SIGSEGV); |
| 246 | } |