Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/sh/kernel/signal.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 7 | * |
| 8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima |
| 9 | * |
| 10 | */ |
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/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/kernel.h> |
| 15 | #include <linux/signal.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/wait.h> |
| 18 | #include <linux/ptrace.h> |
| 19 | #include <linux/unistd.h> |
| 20 | #include <linux/stddef.h> |
| 21 | #include <linux/tty.h> |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 22 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/personality.h> |
| 24 | #include <linux/binfmts.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 25 | #include <linux/freezer.h> |
Paul Mundt | b66d51c | 2007-06-01 17:26:13 +0900 | [diff] [blame] | 26 | #include <linux/io.h> |
Paul Mundt | bd07999 | 2007-05-08 14:50:59 +0900 | [diff] [blame] | 27 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/ucontext.h> |
| 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/pgtable.h> |
| 31 | #include <asm/cacheflush.h> |
Paul Mundt | 9bbafce | 2008-03-26 19:02:47 +0900 | [diff] [blame^] | 32 | #include <asm/fpu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | /* |
| 37 | * Atomically swap in the new signal mask, and wait for a signal. |
| 38 | */ |
| 39 | asmlinkage int |
| 40 | sys_sigsuspend(old_sigset_t mask, |
| 41 | unsigned long r5, unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 42 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | mask &= _BLOCKABLE; |
| 45 | spin_lock_irq(¤t->sighand->siglock); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 46 | current->saved_sigmask = current->blocked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | siginitset(¤t->blocked, mask); |
| 48 | recalc_sigpending(); |
| 49 | spin_unlock_irq(¤t->sighand->siglock); |
| 50 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 51 | current->state = TASK_INTERRUPTIBLE; |
| 52 | schedule(); |
| 53 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 54 | return -ERESTARTNOHAND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | } |
| 56 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 57 | asmlinkage int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 59 | struct old_sigaction __user *oact) |
| 60 | { |
| 61 | struct k_sigaction new_ka, old_ka; |
| 62 | int ret; |
| 63 | |
| 64 | if (act) { |
| 65 | old_sigset_t mask; |
| 66 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 67 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 68 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| 69 | return -EFAULT; |
| 70 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 71 | __get_user(mask, &act->sa_mask); |
| 72 | siginitset(&new_ka.sa.sa_mask, mask); |
| 73 | } |
| 74 | |
| 75 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 76 | |
| 77 | if (!ret && oact) { |
| 78 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 79 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 80 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| 81 | return -EFAULT; |
| 82 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 83 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 84 | } |
| 85 | |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | asmlinkage int |
| 90 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
| 91 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 92 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 94 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 95 | |
| 96 | return do_sigaltstack(uss, uoss, regs->regs[15]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | |
| 100 | /* |
| 101 | * Do a signal return; undo the signal stack. |
| 102 | */ |
| 103 | |
| 104 | #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ |
Yoshinori Sato | 11cbb70 | 2006-12-07 18:07:27 +0900 | [diff] [blame] | 105 | #if defined(CONFIG_CPU_SH2) |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 106 | #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ |
| 107 | #else |
| 108 | #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ |
| 109 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ |
| 111 | |
| 112 | struct sigframe |
| 113 | { |
| 114 | struct sigcontext sc; |
| 115 | unsigned long extramask[_NSIG_WORDS-1]; |
| 116 | u16 retcode[8]; |
| 117 | }; |
| 118 | |
| 119 | struct rt_sigframe |
| 120 | { |
| 121 | struct siginfo info; |
| 122 | struct ucontext uc; |
| 123 | u16 retcode[8]; |
| 124 | }; |
| 125 | |
| 126 | #ifdef CONFIG_SH_FPU |
| 127 | static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) |
| 128 | { |
| 129 | struct task_struct *tsk = current; |
| 130 | |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 131 | if (!(current_cpu_data.flags & CPU_HAS_FPU)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | return 0; |
| 133 | |
| 134 | set_used_math(); |
| 135 | return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0], |
| 136 | sizeof(long)*(16*2+2)); |
| 137 | } |
| 138 | |
| 139 | static inline int save_sigcontext_fpu(struct sigcontext __user *sc, |
| 140 | struct pt_regs *regs) |
| 141 | { |
| 142 | struct task_struct *tsk = current; |
| 143 | |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 144 | if (!(current_cpu_data.flags & CPU_HAS_FPU)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | return 0; |
| 146 | |
| 147 | if (!used_math()) { |
| 148 | __put_user(0, &sc->sc_ownedfp); |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | __put_user(1, &sc->sc_ownedfp); |
| 153 | |
| 154 | /* This will cause a "finit" to be triggered by the next |
| 155 | attempted FPU operation by the 'current' process. |
| 156 | */ |
| 157 | clear_used_math(); |
| 158 | |
| 159 | unlazy_fpu(tsk, regs); |
| 160 | return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard, |
| 161 | sizeof(long)*(16*2+2)); |
| 162 | } |
| 163 | #endif /* CONFIG_SH_FPU */ |
| 164 | |
| 165 | static int |
| 166 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) |
| 167 | { |
| 168 | unsigned int err = 0; |
| 169 | |
| 170 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) |
| 171 | COPY(regs[1]); |
| 172 | COPY(regs[2]); COPY(regs[3]); |
| 173 | COPY(regs[4]); COPY(regs[5]); |
| 174 | COPY(regs[6]); COPY(regs[7]); |
| 175 | COPY(regs[8]); COPY(regs[9]); |
| 176 | COPY(regs[10]); COPY(regs[11]); |
| 177 | COPY(regs[12]); COPY(regs[13]); |
| 178 | COPY(regs[14]); COPY(regs[15]); |
| 179 | COPY(gbr); COPY(mach); |
| 180 | COPY(macl); COPY(pr); |
| 181 | COPY(sr); COPY(pc); |
| 182 | #undef COPY |
| 183 | |
| 184 | #ifdef CONFIG_SH_FPU |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 185 | if (current_cpu_data.flags & CPU_HAS_FPU) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | int owned_fp; |
| 187 | struct task_struct *tsk = current; |
| 188 | |
| 189 | regs->sr |= SR_FD; /* Release FPU */ |
| 190 | clear_fpu(tsk, regs); |
| 191 | clear_used_math(); |
| 192 | __get_user (owned_fp, &sc->sc_ownedfp); |
| 193 | if (owned_fp) |
| 194 | err |= restore_sigcontext_fpu(sc); |
| 195 | } |
| 196 | #endif |
| 197 | |
| 198 | regs->tra = -1; /* disable syscall checks */ |
| 199 | err |= __get_user(*r0_p, &sc->sc_regs[0]); |
| 200 | return err; |
| 201 | } |
| 202 | |
| 203 | asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, |
| 204 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 205 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 207 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 208 | struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | sigset_t set; |
| 210 | int r0; |
| 211 | |
| 212 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 213 | goto badframe; |
| 214 | |
| 215 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 216 | || (_NSIG_WORDS > 1 |
| 217 | && __copy_from_user(&set.sig[1], &frame->extramask, |
| 218 | sizeof(frame->extramask)))) |
| 219 | goto badframe; |
| 220 | |
| 221 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 222 | |
| 223 | spin_lock_irq(¤t->sighand->siglock); |
| 224 | current->blocked = set; |
| 225 | recalc_sigpending(); |
| 226 | spin_unlock_irq(¤t->sighand->siglock); |
| 227 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 228 | if (restore_sigcontext(regs, &frame->sc, &r0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | goto badframe; |
| 230 | return r0; |
| 231 | |
| 232 | badframe: |
| 233 | force_sig(SIGSEGV, current); |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, |
| 238 | unsigned long r6, unsigned long r7, |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 239 | struct pt_regs __regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 241 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 242 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | sigset_t set; |
| 244 | stack_t st; |
| 245 | int r0; |
| 246 | |
| 247 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 248 | goto badframe; |
| 249 | |
| 250 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 251 | goto badframe; |
| 252 | |
| 253 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 254 | spin_lock_irq(¤t->sighand->siglock); |
| 255 | current->blocked = set; |
| 256 | recalc_sigpending(); |
| 257 | spin_unlock_irq(¤t->sighand->siglock); |
| 258 | |
Stuart Menefy | f0bc814 | 2006-11-21 11:16:57 +0900 | [diff] [blame] | 259 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | goto badframe; |
| 261 | |
| 262 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) |
| 263 | goto badframe; |
| 264 | /* It is more difficult to avoid calling this function than to |
| 265 | call it and ignore errors. */ |
Paul Mundt | e08f457 | 2007-05-14 12:52:56 +0900 | [diff] [blame] | 266 | do_sigaltstack((const stack_t __user *)&st, NULL, (unsigned long)frame); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | return r0; |
| 269 | |
| 270 | badframe: |
| 271 | force_sig(SIGSEGV, current); |
| 272 | return 0; |
Paul Mundt | 3aeb884 | 2007-06-19 12:33:21 +0900 | [diff] [blame] | 273 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | /* |
| 276 | * Set up a signal frame. |
| 277 | */ |
| 278 | |
| 279 | static int |
| 280 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
| 281 | unsigned long mask) |
| 282 | { |
| 283 | int err = 0; |
| 284 | |
| 285 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
| 286 | COPY(regs[0]); COPY(regs[1]); |
| 287 | COPY(regs[2]); COPY(regs[3]); |
| 288 | COPY(regs[4]); COPY(regs[5]); |
| 289 | COPY(regs[6]); COPY(regs[7]); |
| 290 | COPY(regs[8]); COPY(regs[9]); |
| 291 | COPY(regs[10]); COPY(regs[11]); |
| 292 | COPY(regs[12]); COPY(regs[13]); |
| 293 | COPY(regs[14]); COPY(regs[15]); |
| 294 | COPY(gbr); COPY(mach); |
| 295 | COPY(macl); COPY(pr); |
| 296 | COPY(sr); COPY(pc); |
| 297 | #undef COPY |
| 298 | |
| 299 | #ifdef CONFIG_SH_FPU |
| 300 | err |= save_sigcontext_fpu(sc, regs); |
| 301 | #endif |
| 302 | |
| 303 | /* non-iBCS2 extensions.. */ |
| 304 | err |= __put_user(mask, &sc->oldmask); |
| 305 | |
| 306 | return err; |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * Determine which stack to use.. |
| 311 | */ |
| 312 | static inline void __user * |
| 313 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 314 | { |
| 315 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 316 | if (sas_ss_flags(sp) == 0) |
| 317 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 318 | } |
| 319 | |
| 320 | return (void __user *)((sp - frame_size) & -8ul); |
| 321 | } |
| 322 | |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 323 | /* These symbols are defined with the addresses in the vsyscall page. |
| 324 | See vsyscall-trapa.S. */ |
| 325 | extern void __user __kernel_sigreturn; |
| 326 | extern void __user __kernel_rt_sigreturn; |
| 327 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 328 | static int setup_frame(int sig, struct k_sigaction *ka, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | sigset_t *set, struct pt_regs *regs) |
| 330 | { |
| 331 | struct sigframe __user *frame; |
| 332 | int err = 0; |
| 333 | int signal; |
| 334 | |
| 335 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 336 | |
| 337 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 338 | goto give_sigsegv; |
| 339 | |
| 340 | signal = current_thread_info()->exec_domain |
| 341 | && current_thread_info()->exec_domain->signal_invmap |
| 342 | && sig < 32 |
| 343 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 344 | : sig; |
| 345 | |
| 346 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); |
| 347 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 348 | if (_NSIG_WORDS > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
| 350 | sizeof(frame->extramask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | /* Set up to return from userspace. If provided, use a stub |
| 353 | already in userspace. */ |
| 354 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 355 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 356 | #ifdef CONFIG_VSYSCALL |
| 357 | } else if (likely(current->mm->context.vdso)) { |
| 358 | regs->pr = VDSO_SYM(&__kernel_sigreturn); |
| 359 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | } else { |
| 361 | /* Generate return code (system call to sigreturn) */ |
| 362 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 363 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 365 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 366 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 367 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 368 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 369 | err |= __put_user((__NR_sigreturn), &frame->retcode[7]); |
| 370 | regs->pr = (unsigned long) frame->retcode; |
| 371 | } |
| 372 | |
| 373 | if (err) |
| 374 | goto give_sigsegv; |
| 375 | |
| 376 | /* Set up registers for signal handler */ |
| 377 | regs->regs[15] = (unsigned long) frame; |
| 378 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 379 | regs->regs[5] = 0; |
| 380 | regs->regs[6] = (unsigned long) &frame->sc; |
| 381 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 382 | |
| 383 | set_fs(USER_DS); |
| 384 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 385 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 386 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | flush_cache_sigtramp(regs->pr); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) |
| 391 | flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 392 | |
| 393 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | give_sigsegv: |
| 396 | force_sigsegv(sig, current); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 397 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
| 399 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 400 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | sigset_t *set, struct pt_regs *regs) |
| 402 | { |
| 403 | struct rt_sigframe __user *frame; |
| 404 | int err = 0; |
| 405 | int signal; |
| 406 | |
| 407 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 408 | |
| 409 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 410 | goto give_sigsegv; |
| 411 | |
| 412 | signal = current_thread_info()->exec_domain |
| 413 | && current_thread_info()->exec_domain->signal_invmap |
| 414 | && sig < 32 |
| 415 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 416 | : sig; |
| 417 | |
| 418 | err |= copy_siginfo_to_user(&frame->info, info); |
| 419 | |
| 420 | /* Create the ucontext. */ |
| 421 | err |= __put_user(0, &frame->uc.uc_flags); |
| 422 | err |= __put_user(0, &frame->uc.uc_link); |
| 423 | err |= __put_user((void *)current->sas_ss_sp, |
| 424 | &frame->uc.uc_stack.ss_sp); |
| 425 | err |= __put_user(sas_ss_flags(regs->regs[15]), |
| 426 | &frame->uc.uc_stack.ss_flags); |
| 427 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 428 | err |= setup_sigcontext(&frame->uc.uc_mcontext, |
| 429 | regs, set->sig[0]); |
| 430 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 431 | |
| 432 | /* Set up to return from userspace. If provided, use a stub |
| 433 | already in userspace. */ |
| 434 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 435 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
Paul Mundt | 19f9a34 | 2006-09-27 18:33:49 +0900 | [diff] [blame] | 436 | #ifdef CONFIG_VSYSCALL |
| 437 | } else if (likely(current->mm->context.vdso)) { |
| 438 | regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); |
| 439 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } else { |
| 441 | /* Generate return code (system call to rt_sigreturn) */ |
| 442 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
Yoshinori Sato | 9d4436a | 2006-11-05 15:40:13 +0900 | [diff] [blame] | 443 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 445 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 446 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 447 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 448 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 449 | err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); |
| 450 | regs->pr = (unsigned long) frame->retcode; |
| 451 | } |
| 452 | |
| 453 | if (err) |
| 454 | goto give_sigsegv; |
| 455 | |
| 456 | /* Set up registers for signal handler */ |
| 457 | regs->regs[15] = (unsigned long) frame; |
| 458 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 459 | regs->regs[5] = (unsigned long) &frame->info; |
| 460 | regs->regs[6] = (unsigned long) &frame->uc; |
| 461 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 462 | |
| 463 | set_fs(USER_DS); |
| 464 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 465 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
Alexey Dobriyan | 19c5870 | 2007-10-18 23:40:41 -0700 | [diff] [blame] | 466 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
| 468 | flush_cache_sigtramp(regs->pr); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode)) |
| 471 | flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 472 | |
| 473 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | give_sigsegv: |
| 476 | force_sigsegv(sig, current); |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 477 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | /* |
| 481 | * OK, we're invoking a handler |
| 482 | */ |
| 483 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 484 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, |
Kaz Kojima | 69a3314 | 2007-06-18 10:08:20 +0900 | [diff] [blame] | 486 | sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 488 | int ret; |
| 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | /* Are we from a system call? */ |
| 491 | if (regs->tra >= 0) { |
| 492 | /* If so, check system call restarting.. */ |
| 493 | switch (regs->regs[0]) { |
Paul Mundt | 3aeb884 | 2007-06-19 12:33:21 +0900 | [diff] [blame] | 494 | case -ERESTART_RESTARTBLOCK: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | case -ERESTARTNOHAND: |
| 496 | regs->regs[0] = -EINTR; |
| 497 | break; |
| 498 | |
| 499 | case -ERESTARTSYS: |
| 500 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
| 501 | regs->regs[0] = -EINTR; |
| 502 | break; |
| 503 | } |
| 504 | /* fallthrough */ |
| 505 | case -ERESTARTNOINTR: |
Kaz Kojima | 69a3314 | 2007-06-18 10:08:20 +0900 | [diff] [blame] | 506 | regs->regs[0] = save_r0; |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 507 | regs->pc -= instruction_size( |
| 508 | ctrl_inw(regs->pc - 4)); |
| 509 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | /* Set up the stack frame */ |
| 514 | if (ka->sa.sa_flags & SA_SIGINFO) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 515 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | else |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 517 | ret = setup_frame(sig, ka, oldset, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | if (ka->sa.sa_flags & SA_ONESHOT) |
| 520 | ka->sa.sa_handler = SIG_DFL; |
| 521 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 522 | if (ret == 0) { |
| 523 | spin_lock_irq(¤t->sighand->siglock); |
| 524 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 525 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
| 526 | sigaddset(¤t->blocked,sig); |
| 527 | recalc_sigpending(); |
| 528 | spin_unlock_irq(¤t->sighand->siglock); |
| 529 | } |
| 530 | |
| 531 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 536 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 537 | * mistake. |
| 538 | * |
| 539 | * Note that we go through the signals twice: once to check the signals that |
| 540 | * the kernel can handle, and then we build all the user-level signal handling |
| 541 | * stack-frames in one go after that. |
| 542 | */ |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 543 | static void do_signal(struct pt_regs *regs, unsigned int save_r0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | { |
| 545 | siginfo_t info; |
| 546 | int signr; |
| 547 | struct k_sigaction ka; |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 548 | sigset_t *oldset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
| 550 | /* |
| 551 | * We want the common case to go fast, which |
| 552 | * is why we may in certain cases get here from |
| 553 | * kernel mode. Just return without doing anything |
| 554 | * if so. |
| 555 | */ |
| 556 | if (!user_mode(regs)) |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 557 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Nigel Cunningham | 0e6c1f5 | 2005-07-27 11:43:34 -0700 | [diff] [blame] | 559 | if (try_to_freeze()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | goto no_signal; |
| 561 | |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 562 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 563 | oldset = ¤t->saved_sigmask; |
| 564 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | oldset = ¤t->blocked; |
| 566 | |
| 567 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 568 | if (signr > 0) { |
| 569 | /* Whee! Actually deliver the signal. */ |
Paul Mundt | 3aeb884 | 2007-06-19 12:33:21 +0900 | [diff] [blame] | 570 | if (handle_signal(signr, &ka, &info, oldset, |
| 571 | regs, save_r0) == 0) { |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 572 | /* a signal was successfully delivered; the saved |
| 573 | * sigmask will have been stored in the signal frame, |
| 574 | * and will be restored by sigreturn, so we can simply |
| 575 | * clear the TIF_RESTORE_SIGMASK flag */ |
| 576 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
| 577 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 578 | } |
Ryusuke Sakato | c8bfa1f | 2007-02-23 13:22:56 +0900 | [diff] [blame] | 579 | |
| 580 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | no_signal: |
| 584 | /* Did we come from a system call? */ |
| 585 | if (regs->tra >= 0) { |
| 586 | /* Restart the system call - no handlers present */ |
| 587 | if (regs->regs[0] == -ERESTARTNOHAND || |
| 588 | regs->regs[0] == -ERESTARTSYS || |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 589 | regs->regs[0] == -ERESTARTNOINTR) { |
Ryusuke Sakato | c8bfa1f | 2007-02-23 13:22:56 +0900 | [diff] [blame] | 590 | regs->regs[0] = save_r0; |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 591 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 592 | } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { |
Paul Mundt | 53f983a | 2007-05-08 15:31:48 +0900 | [diff] [blame] | 593 | regs->pc -= instruction_size(ctrl_inw(regs->pc - 4)); |
Paul Mundt | 0b89293 | 2006-09-27 17:22:49 +0900 | [diff] [blame] | 594 | regs->regs[3] = __NR_restart_syscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | } |
Paul Mundt | 9f23e7e | 2006-09-27 17:27:00 +0900 | [diff] [blame] | 597 | |
| 598 | /* if there's no signal to deliver, we just put the saved sigmask |
| 599 | * back */ |
| 600 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { |
| 601 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 602 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0, |
| 607 | __u32 thread_info_flags) |
| 608 | { |
| 609 | /* deal with pending signal delivery */ |
| 610 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
| 611 | do_signal(regs, save_r0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | } |