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) 1991, 1992 Linus Torvalds |
| 7 | * Copyright (C) 1994 - 2000 Ralf Baechle |
| 8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
| 9 | */ |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 10 | #include <linux/cache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/personality.h> |
| 14 | #include <linux/smp.h> |
| 15 | #include <linux/smp_lock.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/signal.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/wait.h> |
| 20 | #include <linux/ptrace.h> |
| 21 | #include <linux/unistd.h> |
| 22 | #include <linux/compiler.h> |
| 23 | |
Ralf Baechle | e50c0a8 | 2005-05-31 11:49:19 +0000 | [diff] [blame] | 24 | #include <asm/abi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <asm/asm.h> |
| 26 | #include <linux/bitops.h> |
| 27 | #include <asm/cacheflush.h> |
| 28 | #include <asm/fpu.h> |
| 29 | #include <asm/sim.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/ucontext.h> |
| 32 | #include <asm/cpu-features.h> |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 33 | #include <asm/war.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #include "signal-common.h" |
| 36 | |
| 37 | #define DEBUG_SIG 0 |
| 38 | |
| 39 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | /* |
| 42 | * Atomically swap in the new signal mask, and wait for a signal. |
| 43 | */ |
| 44 | |
| 45 | #ifdef CONFIG_TRAD_SIGNALS |
| 46 | save_static_function(sys_sigsuspend); |
| 47 | __attribute_used__ noinline static int |
| 48 | _sys_sigsuspend(nabi_no_regargs struct pt_regs regs) |
| 49 | { |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 50 | sigset_t newset; |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 51 | sigset_t __user *uset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 53 | uset = (sigset_t __user *) regs.regs[4]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | if (copy_from_user(&newset, uset, sizeof(sigset_t))) |
| 55 | return -EFAULT; |
| 56 | sigdelsetmask(&newset, ~_BLOCKABLE); |
| 57 | |
| 58 | spin_lock_irq(¤t->sighand->siglock); |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 59 | current->saved_sigmask = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | current->blocked = newset; |
| 61 | recalc_sigpending(); |
| 62 | spin_unlock_irq(¤t->sighand->siglock); |
| 63 | |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 64 | current->state = TASK_INTERRUPTIBLE; |
| 65 | schedule(); |
| 66 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 67 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | #endif |
| 70 | |
| 71 | save_static_function(sys_rt_sigsuspend); |
| 72 | __attribute_used__ noinline static int |
| 73 | _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) |
| 74 | { |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 75 | sigset_t newset; |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 76 | sigset_t __user *unewset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | size_t sigsetsize; |
| 78 | |
| 79 | /* XXX Don't preclude handling different sized sigset_t's. */ |
| 80 | sigsetsize = regs.regs[5]; |
| 81 | if (sigsetsize != sizeof(sigset_t)) |
| 82 | return -EINVAL; |
| 83 | |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 84 | unewset = (sigset_t __user *) regs.regs[4]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
| 86 | return -EFAULT; |
| 87 | sigdelsetmask(&newset, ~_BLOCKABLE); |
| 88 | |
| 89 | spin_lock_irq(¤t->sighand->siglock); |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 90 | current->saved_sigmask = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | current->blocked = newset; |
| 92 | recalc_sigpending(); |
| 93 | spin_unlock_irq(¤t->sighand->siglock); |
| 94 | |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 95 | current->state = TASK_INTERRUPTIBLE; |
| 96 | schedule(); |
| 97 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 98 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | #ifdef CONFIG_TRAD_SIGNALS |
Atsushi Nemoto | 9c6031c | 2006-02-19 23:46:44 +0900 | [diff] [blame] | 102 | asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act, |
| 103 | struct sigaction __user *oact) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
| 105 | struct k_sigaction new_ka, old_ka; |
| 106 | int ret; |
| 107 | int err = 0; |
| 108 | |
| 109 | if (act) { |
| 110 | old_sigset_t mask; |
| 111 | |
| 112 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) |
| 113 | return -EFAULT; |
| 114 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); |
| 115 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 116 | err |= __get_user(mask, &act->sa_mask.sig[0]); |
| 117 | if (err) |
| 118 | return -EFAULT; |
| 119 | |
| 120 | siginitset(&new_ka.sa.sa_mask, mask); |
| 121 | } |
| 122 | |
| 123 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 124 | |
| 125 | if (!ret && oact) { |
| 126 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) |
| 127 | return -EFAULT; |
| 128 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 129 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); |
| 130 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); |
| 131 | err |= __put_user(0, &oact->sa_mask.sig[1]); |
| 132 | err |= __put_user(0, &oact->sa_mask.sig[2]); |
| 133 | err |= __put_user(0, &oact->sa_mask.sig[3]); |
| 134 | if (err) |
| 135 | return -EFAULT; |
| 136 | } |
| 137 | |
| 138 | return ret; |
| 139 | } |
| 140 | #endif |
| 141 | |
| 142 | asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs) |
| 143 | { |
Ralf Baechle | fe00f94 | 2005-03-01 19:22:29 +0000 | [diff] [blame] | 144 | const stack_t __user *uss = (const stack_t __user *) regs.regs[4]; |
| 145 | stack_t __user *uoss = (stack_t __user *) regs.regs[5]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | unsigned long usp = regs.regs[29]; |
| 147 | |
| 148 | return do_sigaltstack(uss, uoss, usp); |
| 149 | } |
| 150 | |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 151 | /* |
| 152 | * Horribly complicated - with the bloody RM9000 workarounds enabled |
| 153 | * the signal trampolines is moving to the end of the structure so we can |
| 154 | * increase the alignment without breaking software compatibility. |
| 155 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | #ifdef CONFIG_TRAD_SIGNALS |
| 157 | struct sigframe { |
| 158 | u32 sf_ass[4]; /* argument save space for o32 */ |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 159 | #if ICACHE_REFILLS_WORKAROUND_WAR |
| 160 | u32 sf_pad[2]; |
| 161 | #else |
| 162 | u32 sf_code[2]; /* signal trampoline */ |
| 163 | #endif |
| 164 | struct sigcontext sf_sc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | sigset_t sf_mask; |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 166 | #if ICACHE_REFILLS_WORKAROUND_WAR |
| 167 | u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ |
| 168 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | }; |
| 170 | #endif |
| 171 | |
| 172 | struct rt_sigframe { |
| 173 | u32 rs_ass[4]; /* argument save space for o32 */ |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 174 | #if ICACHE_REFILLS_WORKAROUND_WAR |
| 175 | u32 rs_pad[2]; |
| 176 | #else |
| 177 | u32 rs_code[2]; /* signal trampoline */ |
| 178 | #endif |
| 179 | struct siginfo rs_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | struct ucontext rs_uc; |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 181 | #if ICACHE_REFILLS_WORKAROUND_WAR |
| 182 | u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ |
| 183 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | }; |
| 185 | |
| 186 | #ifdef CONFIG_TRAD_SIGNALS |
| 187 | save_static_function(sys_sigreturn); |
| 188 | __attribute_used__ noinline static void |
| 189 | _sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
| 190 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 191 | struct sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | sigset_t blocked; |
| 193 | |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 194 | frame = (struct sigframe __user *) regs.regs[29]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 196 | goto badframe; |
| 197 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) |
| 198 | goto badframe; |
| 199 | |
| 200 | sigdelsetmask(&blocked, ~_BLOCKABLE); |
| 201 | spin_lock_irq(¤t->sighand->siglock); |
| 202 | current->blocked = blocked; |
| 203 | recalc_sigpending(); |
| 204 | spin_unlock_irq(¤t->sighand->siglock); |
| 205 | |
| 206 | if (restore_sigcontext(®s, &frame->sf_sc)) |
| 207 | goto badframe; |
| 208 | |
| 209 | /* |
| 210 | * Don't let your children do this ... |
| 211 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | __asm__ __volatile__( |
| 213 | "move\t$29, %0\n\t" |
| 214 | "j\tsyscall_exit" |
| 215 | :/* no outputs */ |
| 216 | :"r" (®s)); |
| 217 | /* Unreached */ |
| 218 | |
| 219 | badframe: |
| 220 | force_sig(SIGSEGV, current); |
| 221 | } |
Ralf Baechle | e50c0a8 | 2005-05-31 11:49:19 +0000 | [diff] [blame] | 222 | #endif /* CONFIG_TRAD_SIGNALS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
| 224 | save_static_function(sys_rt_sigreturn); |
| 225 | __attribute_used__ noinline static void |
| 226 | _sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
| 227 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 228 | struct rt_sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | sigset_t set; |
| 230 | stack_t st; |
| 231 | |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 232 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 234 | goto badframe; |
| 235 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) |
| 236 | goto badframe; |
| 237 | |
| 238 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 239 | spin_lock_irq(¤t->sighand->siglock); |
| 240 | current->blocked = set; |
| 241 | recalc_sigpending(); |
| 242 | spin_unlock_irq(¤t->sighand->siglock); |
| 243 | |
| 244 | if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) |
| 245 | goto badframe; |
| 246 | |
| 247 | if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st))) |
| 248 | goto badframe; |
| 249 | /* It is more difficult to avoid calling this function than to |
| 250 | call it and ignore errors. */ |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 251 | do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 253 | /* |
| 254 | * Don't let your children do this ... |
| 255 | */ |
| 256 | __asm__ __volatile__( |
| 257 | "move\t$29, %0\n\t" |
| 258 | "j\tsyscall_exit" |
| 259 | :/* no outputs */ |
| 260 | :"r" (®s)); |
| 261 | /* Unreached */ |
| 262 | |
| 263 | badframe: |
| 264 | force_sig(SIGSEGV, current); |
| 265 | } |
| 266 | |
| 267 | #ifdef CONFIG_TRAD_SIGNALS |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 268 | int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | int signr, sigset_t *set) |
| 270 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 271 | struct sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | int err = 0; |
| 273 | |
| 274 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 275 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
| 276 | goto give_sigsegv; |
| 277 | |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 278 | install_sigtramp(frame->sf_code, __NR_sigreturn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | err |= setup_sigcontext(regs, &frame->sf_sc); |
| 281 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); |
| 282 | if (err) |
| 283 | goto give_sigsegv; |
| 284 | |
| 285 | /* |
| 286 | * Arguments to signal handler: |
| 287 | * |
| 288 | * a0 = signal number |
| 289 | * a1 = 0 (should be cause) |
| 290 | * a2 = pointer to struct sigcontext |
| 291 | * |
| 292 | * $25 and c0_epc point to the signal handler, $29 points to the |
| 293 | * struct sigframe. |
| 294 | */ |
| 295 | regs->regs[ 4] = signr; |
| 296 | regs->regs[ 5] = 0; |
| 297 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; |
| 298 | regs->regs[29] = (unsigned long) frame; |
| 299 | regs->regs[31] = (unsigned long) frame->sf_code; |
| 300 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
| 301 | |
| 302 | #if DEBUG_SIG |
| 303 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", |
| 304 | current->comm, current->pid, |
| 305 | frame, regs->cp0_epc, frame->regs[31]); |
| 306 | #endif |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 307 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
| 309 | give_sigsegv: |
| 310 | force_sigsegv(signr, current); |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 311 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | #endif |
| 314 | |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 315 | int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | int signr, sigset_t *set, siginfo_t *info) |
| 317 | { |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 318 | struct rt_sigframe __user *frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | int err = 0; |
| 320 | |
| 321 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 322 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
| 323 | goto give_sigsegv; |
| 324 | |
Ralf Baechle | 02416dc | 2005-06-15 13:00:12 +0000 | [diff] [blame] | 325 | install_sigtramp(frame->rs_code, __NR_rt_sigreturn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | /* Create siginfo. */ |
| 328 | err |= copy_siginfo_to_user(&frame->rs_info, info); |
| 329 | |
| 330 | /* Create the ucontext. */ |
| 331 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
Atsushi Nemoto | 5665a0a | 2006-02-02 01:26:34 +0900 | [diff] [blame] | 332 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
Atsushi Nemoto | 9c6031c | 2006-02-19 23:46:44 +0900 | [diff] [blame] | 333 | err |= __put_user((void __user *)current->sas_ss_sp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | &frame->rs_uc.uc_stack.ss_sp); |
| 335 | err |= __put_user(sas_ss_flags(regs->regs[29]), |
| 336 | &frame->rs_uc.uc_stack.ss_flags); |
| 337 | err |= __put_user(current->sas_ss_size, |
| 338 | &frame->rs_uc.uc_stack.ss_size); |
| 339 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
| 340 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); |
| 341 | |
| 342 | if (err) |
| 343 | goto give_sigsegv; |
| 344 | |
| 345 | /* |
| 346 | * Arguments to signal handler: |
| 347 | * |
| 348 | * a0 = signal number |
| 349 | * a1 = 0 (should be cause) |
| 350 | * a2 = pointer to ucontext |
| 351 | * |
| 352 | * $25 and c0_epc point to the signal handler, $29 points to |
| 353 | * the struct rt_sigframe. |
| 354 | */ |
| 355 | regs->regs[ 4] = signr; |
| 356 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
| 357 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; |
| 358 | regs->regs[29] = (unsigned long) frame; |
| 359 | regs->regs[31] = (unsigned long) frame->rs_code; |
| 360 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
| 361 | |
| 362 | #if DEBUG_SIG |
| 363 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", |
| 364 | current->comm, current->pid, |
| 365 | frame, regs->cp0_epc, regs->regs[31]); |
| 366 | #endif |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 367 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | give_sigsegv: |
| 370 | force_sigsegv(signr, current); |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 371 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 374 | static inline int handle_signal(unsigned long sig, siginfo_t *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) |
| 376 | { |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 377 | int ret; |
| 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | switch(regs->regs[0]) { |
| 380 | case ERESTART_RESTARTBLOCK: |
| 381 | case ERESTARTNOHAND: |
| 382 | regs->regs[2] = EINTR; |
| 383 | break; |
| 384 | case ERESTARTSYS: |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 385 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | regs->regs[2] = EINTR; |
| 387 | break; |
| 388 | } |
| 389 | /* fallthrough */ |
| 390 | case ERESTARTNOINTR: /* Userland will reload $v0. */ |
| 391 | regs->regs[7] = regs->regs[26]; |
| 392 | regs->cp0_epc -= 8; |
| 393 | } |
| 394 | |
| 395 | regs->regs[0] = 0; /* Don't deal with this again. */ |
| 396 | |
Ralf Baechle | e50c0a8 | 2005-05-31 11:49:19 +0000 | [diff] [blame] | 397 | if (sig_uses_siginfo(ka)) |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 398 | ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | else |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 400 | ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 402 | spin_lock_irq(¤t->sighand->siglock); |
| 403 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 404 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | sigaddset(¤t->blocked,sig); |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 406 | recalc_sigpending(); |
| 407 | spin_unlock_irq(¤t->sighand->siglock); |
Ralf Baechle | 129bc8f | 2005-07-11 20:45:51 +0000 | [diff] [blame] | 408 | |
| 409 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
| 411 | |
Ralf Baechle | 40ac5d4 | 2006-02-08 13:38:18 +0000 | [diff] [blame] | 412 | void do_signal(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | { |
| 414 | struct k_sigaction ka; |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 415 | sigset_t *oldset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | siginfo_t info; |
| 417 | int signr; |
| 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | /* |
| 420 | * We want the common case to go fast, which is why we may in certain |
| 421 | * cases get here from kernel mode. Just return without doing anything |
| 422 | * if so. |
| 423 | */ |
| 424 | if (!user_mode(regs)) |
Ralf Baechle | 40ac5d4 | 2006-02-08 13:38:18 +0000 | [diff] [blame] | 425 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Yoichi Yuasa | d4b3a80 | 2005-06-27 14:36:30 -0700 | [diff] [blame] | 427 | if (try_to_freeze()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | goto no_signal; |
| 429 | |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 430 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 431 | oldset = ¤t->saved_sigmask; |
| 432 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | oldset = ¤t->blocked; |
| 434 | |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 437 | if (signr > 0) { |
| 438 | /* Whee! Actually deliver the signal. */ |
| 439 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { |
| 440 | /* |
| 441 | * A signal was successfully delivered; the saved |
| 442 | * sigmask will have been stored in the signal frame, |
| 443 | * and will be restored by sigreturn, so we can simply |
| 444 | * clear the TIF_RESTORE_SIGMASK flag. |
| 445 | */ |
| 446 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 447 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 448 | } |
| 449 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | no_signal: |
| 452 | /* |
| 453 | * Who's code doesn't conform to the restartable syscall convention |
| 454 | * dies here!!! The li instruction, a single machine instruction, |
| 455 | * must directly be followed by the syscall instruction. |
| 456 | */ |
| 457 | if (regs->regs[0]) { |
| 458 | if (regs->regs[2] == ERESTARTNOHAND || |
| 459 | regs->regs[2] == ERESTARTSYS || |
| 460 | regs->regs[2] == ERESTARTNOINTR) { |
| 461 | regs->regs[7] = regs->regs[26]; |
| 462 | regs->cp0_epc -= 8; |
| 463 | } |
| 464 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { |
| 465 | regs->regs[2] = __NR_restart_syscall; |
| 466 | regs->regs[7] = regs->regs[26]; |
| 467 | regs->cp0_epc -= 4; |
| 468 | } |
| 469 | } |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 470 | |
| 471 | /* |
| 472 | * If there's no signal to deliver, we just put the saved sigmask |
| 473 | * back |
| 474 | */ |
| 475 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
| 476 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 477 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
| 478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | /* |
| 482 | * notification of userspace execution resumption |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 483 | * - triggered by the TIF_WORK_MASK flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | */ |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 485 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | __u32 thread_info_flags) |
| 487 | { |
| 488 | /* deal with pending signal delivery */ |
Ralf Baechle | 7b3e2fc | 2006-02-08 12:58:41 +0000 | [diff] [blame] | 489 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
| 490 | current->thread.abi->do_signal(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |