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 | * arch/sh64/kernel/signal.c |
| 7 | * |
| 8 | * Copyright (C) 2000, 2001 Paolo Alberelli |
| 9 | * Copyright (C) 2003 Paul Mundt |
| 10 | * Copyright (C) 2004 Richard Curnow |
| 11 | * |
| 12 | * Started from sh version. |
| 13 | * |
| 14 | */ |
| 15 | #include <linux/rwsem.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/smp.h> |
| 19 | #include <linux/smp_lock.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/signal.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/wait.h> |
| 24 | #include <linux/personality.h> |
| 25 | #include <linux/suspend.h> |
| 26 | #include <linux/ptrace.h> |
| 27 | #include <linux/unistd.h> |
| 28 | #include <linux/stddef.h> |
| 29 | #include <linux/personality.h> |
| 30 | #include <asm/ucontext.h> |
| 31 | #include <asm/uaccess.h> |
| 32 | #include <asm/pgtable.h> |
| 33 | |
| 34 | |
| 35 | #define REG_RET 9 |
| 36 | #define REG_ARG1 2 |
| 37 | #define REG_ARG2 3 |
| 38 | #define REG_ARG3 4 |
| 39 | #define REG_SP 15 |
| 40 | #define REG_PR 18 |
| 41 | #define REF_REG_RET regs->regs[REG_RET] |
| 42 | #define REF_REG_SP regs->regs[REG_SP] |
| 43 | #define DEREF_REG_PR regs->regs[REG_PR] |
| 44 | |
| 45 | #define DEBUG_SIG 0 |
| 46 | |
| 47 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 48 | |
| 49 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); |
| 50 | |
| 51 | /* |
| 52 | * Atomically swap in the new signal mask, and wait for a signal. |
| 53 | */ |
| 54 | |
| 55 | asmlinkage int |
| 56 | sys_sigsuspend(old_sigset_t mask, |
| 57 | unsigned long r3, unsigned long r4, unsigned long r5, |
| 58 | unsigned long r6, unsigned long r7, |
| 59 | struct pt_regs * regs) |
| 60 | { |
| 61 | sigset_t saveset; |
| 62 | |
| 63 | mask &= _BLOCKABLE; |
| 64 | spin_lock_irq(¤t->sighand->siglock); |
| 65 | saveset = current->blocked; |
| 66 | siginitset(¤t->blocked, mask); |
| 67 | recalc_sigpending(); |
| 68 | spin_unlock_irq(¤t->sighand->siglock); |
| 69 | |
| 70 | REF_REG_RET = -EINTR; |
| 71 | while (1) { |
| 72 | current->state = TASK_INTERRUPTIBLE; |
| 73 | schedule(); |
| 74 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ |
| 75 | if (do_signal(regs, &saveset)) { |
| 76 | /* pc now points at signal handler. Need to decrement |
| 77 | it because entry.S will increment it. */ |
| 78 | regs->pc -= 4; |
| 79 | return -EINTR; |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | asmlinkage int |
| 85 | sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, |
| 86 | unsigned long r4, unsigned long r5, unsigned long r6, |
| 87 | unsigned long r7, |
| 88 | struct pt_regs * regs) |
| 89 | { |
| 90 | sigset_t saveset, newset; |
| 91 | |
| 92 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 93 | if (sigsetsize != sizeof(sigset_t)) |
| 94 | return -EINVAL; |
| 95 | |
| 96 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
| 97 | return -EFAULT; |
| 98 | sigdelsetmask(&newset, ~_BLOCKABLE); |
| 99 | spin_lock_irq(¤t->sighand->siglock); |
| 100 | saveset = current->blocked; |
| 101 | current->blocked = newset; |
| 102 | recalc_sigpending(); |
| 103 | spin_unlock_irq(¤t->sighand->siglock); |
| 104 | |
| 105 | REF_REG_RET = -EINTR; |
| 106 | while (1) { |
| 107 | current->state = TASK_INTERRUPTIBLE; |
| 108 | schedule(); |
| 109 | regs->pc += 4; /* because sys_sigreturn decrements the pc */ |
| 110 | if (do_signal(regs, &saveset)) { |
| 111 | /* pc now points at signal handler. Need to decrement |
| 112 | it because entry.S will increment it. */ |
| 113 | regs->pc -= 4; |
| 114 | return -EINTR; |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | asmlinkage int |
| 120 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 121 | struct old_sigaction __user *oact) |
| 122 | { |
| 123 | struct k_sigaction new_ka, old_ka; |
| 124 | int ret; |
| 125 | |
| 126 | if (act) { |
| 127 | old_sigset_t mask; |
| 128 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 129 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 130 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| 131 | return -EFAULT; |
| 132 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 133 | __get_user(mask, &act->sa_mask); |
| 134 | siginitset(&new_ka.sa.sa_mask, mask); |
| 135 | } |
| 136 | |
| 137 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 138 | |
| 139 | if (!ret && oact) { |
| 140 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 141 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 142 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| 143 | return -EFAULT; |
| 144 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 145 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 146 | } |
| 147 | |
| 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | asmlinkage int |
| 152 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
| 153 | unsigned long r4, unsigned long r5, unsigned long r6, |
| 154 | unsigned long r7, |
| 155 | struct pt_regs * regs) |
| 156 | { |
| 157 | return do_sigaltstack(uss, uoss, REF_REG_SP); |
| 158 | } |
| 159 | |
| 160 | |
| 161 | /* |
| 162 | * Do a signal return; undo the signal stack. |
| 163 | */ |
| 164 | |
| 165 | struct sigframe |
| 166 | { |
| 167 | struct sigcontext sc; |
| 168 | unsigned long extramask[_NSIG_WORDS-1]; |
| 169 | long long retcode[2]; |
| 170 | }; |
| 171 | |
| 172 | struct rt_sigframe |
| 173 | { |
| 174 | struct siginfo __user *pinfo; |
| 175 | void *puc; |
| 176 | struct siginfo info; |
| 177 | struct ucontext uc; |
| 178 | long long retcode[2]; |
| 179 | }; |
| 180 | |
| 181 | #ifdef CONFIG_SH_FPU |
| 182 | static inline int |
| 183 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) |
| 184 | { |
| 185 | int err = 0; |
| 186 | int fpvalid; |
| 187 | |
| 188 | err |= __get_user (fpvalid, &sc->sc_fpvalid); |
| 189 | conditional_used_math(fpvalid); |
| 190 | if (! fpvalid) |
| 191 | return err; |
| 192 | |
| 193 | if (current == last_task_used_math) { |
| 194 | last_task_used_math = NULL; |
| 195 | regs->sr |= SR_FD; |
| 196 | } |
| 197 | |
| 198 | err |= __copy_from_user(¤t->thread.fpu.hard, &sc->sc_fpregs[0], |
| 199 | (sizeof(long long) * 32) + (sizeof(int) * 1)); |
| 200 | |
| 201 | return err; |
| 202 | } |
| 203 | |
| 204 | static inline int |
| 205 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) |
| 206 | { |
| 207 | int err = 0; |
| 208 | int fpvalid; |
| 209 | |
| 210 | fpvalid = !!used_math(); |
| 211 | err |= __put_user(fpvalid, &sc->sc_fpvalid); |
| 212 | if (! fpvalid) |
| 213 | return err; |
| 214 | |
| 215 | if (current == last_task_used_math) { |
| 216 | grab_fpu(); |
| 217 | fpsave(¤t->thread.fpu.hard); |
| 218 | release_fpu(); |
| 219 | last_task_used_math = NULL; |
| 220 | regs->sr |= SR_FD; |
| 221 | } |
| 222 | |
| 223 | err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.fpu.hard, |
| 224 | (sizeof(long long) * 32) + (sizeof(int) * 1)); |
| 225 | clear_used_math(); |
| 226 | |
| 227 | return err; |
| 228 | } |
| 229 | #else |
| 230 | static inline int |
| 231 | restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) |
| 232 | {} |
| 233 | static inline int |
| 234 | setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) |
| 235 | {} |
| 236 | #endif |
| 237 | |
| 238 | static int |
| 239 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p) |
| 240 | { |
| 241 | unsigned int err = 0; |
| 242 | unsigned long long current_sr, new_sr; |
| 243 | #define SR_MASK 0xffff8cfd |
| 244 | |
| 245 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) |
| 246 | |
| 247 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); |
| 248 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); |
| 249 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); |
| 250 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); |
| 251 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); |
| 252 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); |
| 253 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); |
| 254 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); |
| 255 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); |
| 256 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); |
| 257 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); |
| 258 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); |
| 259 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); |
| 260 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); |
| 261 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); |
| 262 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); |
| 263 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); |
| 264 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); |
| 265 | |
| 266 | /* Prevent the signal handler manipulating SR in a way that can |
| 267 | crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be |
| 268 | modified */ |
| 269 | current_sr = regs->sr; |
| 270 | err |= __get_user(new_sr, &sc->sc_sr); |
| 271 | regs->sr &= SR_MASK; |
| 272 | regs->sr |= (new_sr & ~SR_MASK); |
| 273 | |
| 274 | COPY(pc); |
| 275 | |
| 276 | #undef COPY |
| 277 | |
| 278 | /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr |
| 279 | * has been restored above.) */ |
| 280 | err |= restore_sigcontext_fpu(regs, sc); |
| 281 | |
| 282 | regs->syscall_nr = -1; /* disable syscall checks */ |
| 283 | err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]); |
| 284 | return err; |
| 285 | } |
| 286 | |
| 287 | asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3, |
| 288 | unsigned long r4, unsigned long r5, |
| 289 | unsigned long r6, unsigned long r7, |
| 290 | struct pt_regs * regs) |
| 291 | { |
| 292 | struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP; |
| 293 | sigset_t set; |
| 294 | long long ret; |
| 295 | |
| 296 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 297 | goto badframe; |
| 298 | |
| 299 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 300 | || (_NSIG_WORDS > 1 |
| 301 | && __copy_from_user(&set.sig[1], &frame->extramask, |
| 302 | sizeof(frame->extramask)))) |
| 303 | goto badframe; |
| 304 | |
| 305 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 306 | |
| 307 | spin_lock_irq(¤t->sighand->siglock); |
| 308 | current->blocked = set; |
| 309 | recalc_sigpending(); |
| 310 | spin_unlock_irq(¤t->sighand->siglock); |
| 311 | |
| 312 | if (restore_sigcontext(regs, &frame->sc, &ret)) |
| 313 | goto badframe; |
| 314 | regs->pc -= 4; |
| 315 | |
| 316 | return (int) ret; |
| 317 | |
| 318 | badframe: |
| 319 | force_sig(SIGSEGV, current); |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3, |
| 324 | unsigned long r4, unsigned long r5, |
| 325 | unsigned long r6, unsigned long r7, |
| 326 | struct pt_regs * regs) |
| 327 | { |
| 328 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP; |
| 329 | sigset_t set; |
| 330 | stack_t __user st; |
| 331 | long long ret; |
| 332 | |
| 333 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 334 | goto badframe; |
| 335 | |
| 336 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 337 | goto badframe; |
| 338 | |
| 339 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 340 | spin_lock_irq(¤t->sighand->siglock); |
| 341 | current->blocked = set; |
| 342 | recalc_sigpending(); |
| 343 | spin_unlock_irq(¤t->sighand->siglock); |
| 344 | |
| 345 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret)) |
| 346 | goto badframe; |
| 347 | regs->pc -= 4; |
| 348 | |
| 349 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) |
| 350 | goto badframe; |
| 351 | /* It is more difficult to avoid calling this function than to |
| 352 | call it and ignore errors. */ |
| 353 | do_sigaltstack(&st, NULL, REF_REG_SP); |
| 354 | |
| 355 | return (int) ret; |
| 356 | |
| 357 | badframe: |
| 358 | force_sig(SIGSEGV, current); |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * Set up a signal frame. |
| 364 | */ |
| 365 | |
| 366 | static int |
| 367 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
| 368 | unsigned long mask) |
| 369 | { |
| 370 | int err = 0; |
| 371 | |
| 372 | /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */ |
| 373 | err |= setup_sigcontext_fpu(regs, sc); |
| 374 | |
| 375 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
| 376 | |
| 377 | COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); |
| 378 | COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); |
| 379 | COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); |
| 380 | COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); |
| 381 | COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); |
| 382 | COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); |
| 383 | COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); |
| 384 | COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); |
| 385 | COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); |
| 386 | COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); |
| 387 | COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); |
| 388 | COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); |
| 389 | COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); |
| 390 | COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); |
| 391 | COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); |
| 392 | COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); |
| 393 | COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); |
| 394 | COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); |
| 395 | COPY(sr); COPY(pc); |
| 396 | |
| 397 | #undef COPY |
| 398 | |
| 399 | err |= __put_user(mask, &sc->oldmask); |
| 400 | |
| 401 | return err; |
| 402 | } |
| 403 | |
| 404 | /* |
| 405 | * Determine which stack to use.. |
| 406 | */ |
| 407 | static inline void __user * |
| 408 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 409 | { |
Laurent MEYER | d09042d | 2006-06-23 02:05:36 -0700 | [diff] [blame] | 410 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 412 | |
| 413 | return (void __user *)((sp - frame_size) & -8ul); |
| 414 | } |
| 415 | |
| 416 | void sa_default_restorer(void); /* See comments below */ |
| 417 | void sa_default_rt_restorer(void); /* See comments below */ |
| 418 | |
| 419 | static void setup_frame(int sig, struct k_sigaction *ka, |
| 420 | sigset_t *set, struct pt_regs *regs) |
| 421 | { |
| 422 | struct sigframe __user *frame; |
| 423 | int err = 0; |
| 424 | int signal; |
| 425 | |
| 426 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); |
| 427 | |
| 428 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 429 | goto give_sigsegv; |
| 430 | |
| 431 | signal = current_thread_info()->exec_domain |
| 432 | && current_thread_info()->exec_domain->signal_invmap |
| 433 | && sig < 32 |
| 434 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 435 | : sig; |
| 436 | |
| 437 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); |
| 438 | |
| 439 | /* Give up earlier as i386, in case */ |
| 440 | if (err) |
| 441 | goto give_sigsegv; |
| 442 | |
| 443 | if (_NSIG_WORDS > 1) { |
| 444 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
| 445 | sizeof(frame->extramask)); } |
| 446 | |
| 447 | /* Give up earlier as i386, in case */ |
| 448 | if (err) |
| 449 | goto give_sigsegv; |
| 450 | |
| 451 | /* Set up to return from userspace. If provided, use a stub |
| 452 | already in userspace. */ |
| 453 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 454 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; |
| 455 | |
| 456 | /* |
| 457 | * On SH5 all edited pointers are subject to NEFF |
| 458 | */ |
| 459 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? |
| 460 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
| 461 | } else { |
| 462 | /* |
| 463 | * Different approach on SH5. |
| 464 | * . Endianness independent asm code gets placed in entry.S . |
| 465 | * This is limited to four ASM instructions corresponding |
| 466 | * to two long longs in size. |
| 467 | * . err checking is done on the else branch only |
| 468 | * . flush_icache_range() is called upon __put_user() only |
| 469 | * . all edited pointers are subject to NEFF |
| 470 | * . being code, linker turns ShMedia bit on, always |
| 471 | * dereference index -1. |
| 472 | */ |
| 473 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; |
| 474 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? |
| 475 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
| 476 | |
| 477 | if (__copy_to_user(frame->retcode, |
| 478 | (unsigned long long)sa_default_restorer & (~1), 16) != 0) |
| 479 | goto give_sigsegv; |
| 480 | |
| 481 | /* Cohere the trampoline with the I-cache. */ |
| 482 | flush_cache_sigtramp(DEREF_REG_PR-1, DEREF_REG_PR-1+16); |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Set up registers for signal handler. |
| 487 | * All edited pointers are subject to NEFF. |
| 488 | */ |
| 489 | regs->regs[REG_SP] = (unsigned long) frame; |
| 490 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? |
| 491 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; |
| 492 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ |
| 493 | |
| 494 | /* FIXME: |
| 495 | The glibc profiling support for SH-5 needs to be passed a sigcontext |
| 496 | so it can retrieve the PC. At some point during 2003 the glibc |
| 497 | support was changed to receive the sigcontext through the 2nd |
| 498 | argument, but there are still versions of libc.so in use that use |
| 499 | the 3rd argument. Until libc.so is stabilised, pass the sigcontext |
| 500 | through both 2nd and 3rd arguments. |
| 501 | */ |
| 502 | |
| 503 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc; |
| 504 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc; |
| 505 | |
| 506 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 507 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; |
| 508 | |
| 509 | set_fs(USER_DS); |
| 510 | |
| 511 | #if DEBUG_SIG |
| 512 | /* Broken %016Lx */ |
| 513 | printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", |
| 514 | signal, |
| 515 | current->comm, current->pid, frame, |
| 516 | regs->pc >> 32, regs->pc & 0xffffffff, |
| 517 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); |
| 518 | #endif |
| 519 | |
| 520 | return; |
| 521 | |
| 522 | give_sigsegv: |
| 523 | force_sigsegv(sig, current); |
| 524 | } |
| 525 | |
| 526 | static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 527 | sigset_t *set, struct pt_regs *regs) |
| 528 | { |
| 529 | struct rt_sigframe __user *frame; |
| 530 | int err = 0; |
| 531 | int signal; |
| 532 | |
| 533 | frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); |
| 534 | |
| 535 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 536 | goto give_sigsegv; |
| 537 | |
| 538 | signal = current_thread_info()->exec_domain |
| 539 | && current_thread_info()->exec_domain->signal_invmap |
| 540 | && sig < 32 |
| 541 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 542 | : sig; |
| 543 | |
| 544 | err |= __put_user(&frame->info, &frame->pinfo); |
| 545 | err |= __put_user(&frame->uc, &frame->puc); |
| 546 | err |= copy_siginfo_to_user(&frame->info, info); |
| 547 | |
| 548 | /* Give up earlier as i386, in case */ |
| 549 | if (err) |
| 550 | goto give_sigsegv; |
| 551 | |
| 552 | /* Create the ucontext. */ |
| 553 | err |= __put_user(0, &frame->uc.uc_flags); |
| 554 | err |= __put_user(0, &frame->uc.uc_link); |
| 555 | err |= __put_user((void *)current->sas_ss_sp, |
| 556 | &frame->uc.uc_stack.ss_sp); |
| 557 | err |= __put_user(sas_ss_flags(regs->regs[REG_SP]), |
| 558 | &frame->uc.uc_stack.ss_flags); |
| 559 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 560 | err |= setup_sigcontext(&frame->uc.uc_mcontext, |
| 561 | regs, set->sig[0]); |
| 562 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 563 | |
| 564 | /* Give up earlier as i386, in case */ |
| 565 | if (err) |
| 566 | goto give_sigsegv; |
| 567 | |
| 568 | /* Set up to return from userspace. If provided, use a stub |
| 569 | already in userspace. */ |
| 570 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 571 | DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1; |
| 572 | |
| 573 | /* |
| 574 | * On SH5 all edited pointers are subject to NEFF |
| 575 | */ |
| 576 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? |
| 577 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
| 578 | } else { |
| 579 | /* |
| 580 | * Different approach on SH5. |
| 581 | * . Endianness independent asm code gets placed in entry.S . |
| 582 | * This is limited to four ASM instructions corresponding |
| 583 | * to two long longs in size. |
| 584 | * . err checking is done on the else branch only |
| 585 | * . flush_icache_range() is called upon __put_user() only |
| 586 | * . all edited pointers are subject to NEFF |
| 587 | * . being code, linker turns ShMedia bit on, always |
| 588 | * dereference index -1. |
| 589 | */ |
| 590 | |
| 591 | DEREF_REG_PR = (unsigned long) frame->retcode | 0x01; |
| 592 | DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ? |
| 593 | (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR; |
| 594 | |
| 595 | if (__copy_to_user(frame->retcode, |
| 596 | (unsigned long long)sa_default_rt_restorer & (~1), 16) != 0) |
| 597 | goto give_sigsegv; |
| 598 | |
| 599 | flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15); |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * Set up registers for signal handler. |
| 604 | * All edited pointers are subject to NEFF. |
| 605 | */ |
| 606 | regs->regs[REG_SP] = (unsigned long) frame; |
| 607 | regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ? |
| 608 | (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP]; |
| 609 | regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ |
| 610 | regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info; |
| 611 | regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext; |
| 612 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 613 | regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc; |
| 614 | |
| 615 | set_fs(USER_DS); |
| 616 | |
| 617 | #if DEBUG_SIG |
| 618 | /* Broken %016Lx */ |
| 619 | printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", |
| 620 | signal, |
| 621 | current->comm, current->pid, frame, |
| 622 | regs->pc >> 32, regs->pc & 0xffffffff, |
| 623 | DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); |
| 624 | #endif |
| 625 | |
| 626 | return; |
| 627 | |
| 628 | give_sigsegv: |
| 629 | force_sigsegv(sig, current); |
| 630 | } |
| 631 | |
| 632 | /* |
| 633 | * OK, we're invoking a handler |
| 634 | */ |
| 635 | |
| 636 | static void |
| 637 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
| 638 | sigset_t *oldset, struct pt_regs * regs) |
| 639 | { |
| 640 | /* Are we from a system call? */ |
| 641 | if (regs->syscall_nr >= 0) { |
| 642 | /* If so, check system call restarting.. */ |
| 643 | switch (regs->regs[REG_RET]) { |
| 644 | case -ERESTARTNOHAND: |
| 645 | regs->regs[REG_RET] = -EINTR; |
| 646 | break; |
| 647 | |
| 648 | case -ERESTARTSYS: |
| 649 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
| 650 | regs->regs[REG_RET] = -EINTR; |
| 651 | break; |
| 652 | } |
| 653 | /* fallthrough */ |
| 654 | case -ERESTARTNOINTR: |
| 655 | /* Decode syscall # */ |
| 656 | regs->regs[REG_RET] = regs->syscall_nr; |
| 657 | regs->pc -= 4; |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | /* Set up the stack frame */ |
| 662 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 663 | setup_rt_frame(sig, ka, info, oldset, regs); |
| 664 | else |
| 665 | setup_frame(sig, ka, oldset, regs); |
| 666 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 667 | spin_lock_irq(¤t->sighand->siglock); |
| 668 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 669 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | sigaddset(¤t->blocked,sig); |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 671 | recalc_sigpending(); |
| 672 | spin_unlock_irq(¤t->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
| 675 | /* |
| 676 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 677 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 678 | * mistake. |
| 679 | * |
| 680 | * Note that we go through the signals twice: once to check the signals that |
| 681 | * the kernel can handle, and then we build all the user-level signal handling |
| 682 | * stack-frames in one go after that. |
| 683 | */ |
| 684 | int do_signal(struct pt_regs *regs, sigset_t *oldset) |
| 685 | { |
| 686 | siginfo_t info; |
| 687 | int signr; |
| 688 | struct k_sigaction ka; |
| 689 | |
| 690 | /* |
| 691 | * We want the common case to go fast, which |
| 692 | * is why we may in certain cases get here from |
| 693 | * kernel mode. Just return without doing anything |
| 694 | * if so. |
| 695 | */ |
| 696 | if (!user_mode(regs)) |
| 697 | return 1; |
| 698 | |
Nigel Cunningham | 0e6c1f5 | 2005-07-27 11:43:34 -0700 | [diff] [blame] | 699 | if (try_to_freeze()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | goto no_signal; |
| 701 | |
| 702 | if (!oldset) |
| 703 | oldset = ¤t->blocked; |
| 704 | |
| 705 | signr = get_signal_to_deliver(&info, &ka, regs, 0); |
| 706 | |
| 707 | if (signr > 0) { |
| 708 | /* Whee! Actually deliver the signal. */ |
| 709 | handle_signal(signr, &info, &ka, oldset, regs); |
| 710 | return 1; |
| 711 | } |
| 712 | |
| 713 | no_signal: |
| 714 | /* Did we come from a system call? */ |
| 715 | if (regs->syscall_nr >= 0) { |
| 716 | /* Restart the system call - no handlers present */ |
| 717 | if (regs->regs[REG_RET] == -ERESTARTNOHAND || |
| 718 | regs->regs[REG_RET] == -ERESTARTSYS || |
| 719 | regs->regs[REG_RET] == -ERESTARTNOINTR) { |
| 720 | /* Decode Syscall # */ |
| 721 | regs->regs[REG_RET] = regs->syscall_nr; |
| 722 | regs->pc -= 4; |
| 723 | } |
| 724 | } |
| 725 | return 0; |
| 726 | } |