Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/h8300/kernel/signal.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of the GNU General Public |
| 7 | * License. See the file COPYING in the main directory of this archive |
| 8 | * for more details. |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp> |
| 13 | * and David McCullough <davidm@snapgear.com> |
| 14 | * |
| 15 | * Based on |
| 16 | * Linux/m68k by Hamish Macdonald |
| 17 | */ |
| 18 | |
| 19 | /* |
| 20 | * ++roman (07/09/96): implemented signal stacks (specially for tosemu on |
| 21 | * Atari :-) Current limitation: Only one sigstack can be active at one time. |
| 22 | * If a second signal with SA_ONSTACK set arrives while working on a sigstack, |
| 23 | * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested |
| 24 | * signal handlers! |
| 25 | */ |
| 26 | |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/signal.h> |
| 31 | #include <linux/syscalls.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/wait.h> |
| 34 | #include <linux/ptrace.h> |
| 35 | #include <linux/unistd.h> |
| 36 | #include <linux/stddef.h> |
| 37 | #include <linux/highuid.h> |
| 38 | #include <linux/personality.h> |
| 39 | #include <linux/tty.h> |
| 40 | #include <linux/binfmts.h> |
| 41 | #include <linux/suspend.h> |
| 42 | |
| 43 | #include <asm/setup.h> |
| 44 | #include <asm/uaccess.h> |
| 45 | #include <asm/pgtable.h> |
| 46 | #include <asm/traps.h> |
| 47 | #include <asm/ucontext.h> |
| 48 | |
| 49 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 50 | |
| 51 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); |
| 52 | |
| 53 | /* |
| 54 | * Atomically swap in the new signal mask, and wait for a signal. |
| 55 | */ |
| 56 | asmlinkage int do_sigsuspend(struct pt_regs *regs) |
| 57 | { |
| 58 | old_sigset_t mask = regs->er3; |
| 59 | sigset_t saveset; |
| 60 | |
| 61 | mask &= _BLOCKABLE; |
| 62 | spin_lock_irq(¤t->sighand->siglock); |
| 63 | saveset = current->blocked; |
| 64 | siginitset(¤t->blocked, mask); |
| 65 | recalc_sigpending(); |
| 66 | spin_unlock_irq(¤t->sighand->siglock); |
| 67 | |
| 68 | regs->er0 = -EINTR; |
| 69 | while (1) { |
| 70 | current->state = TASK_INTERRUPTIBLE; |
| 71 | schedule(); |
| 72 | if (do_signal(regs, &saveset)) |
| 73 | return -EINTR; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | asmlinkage int |
| 78 | do_rt_sigsuspend(struct pt_regs *regs) |
| 79 | { |
| 80 | sigset_t *unewset = (sigset_t *)regs->er1; |
| 81 | size_t sigsetsize = (size_t)regs->er2; |
| 82 | sigset_t saveset, newset; |
| 83 | |
| 84 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 85 | if (sigsetsize != sizeof(sigset_t)) |
| 86 | return -EINVAL; |
| 87 | |
| 88 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
| 89 | return -EFAULT; |
| 90 | sigdelsetmask(&newset, ~_BLOCKABLE); |
| 91 | |
| 92 | spin_lock_irq(¤t->sighand->siglock); |
| 93 | saveset = current->blocked; |
| 94 | current->blocked = newset; |
| 95 | recalc_sigpending(); |
| 96 | spin_unlock_irq(¤t->sighand->siglock); |
| 97 | |
| 98 | regs->er0 = -EINTR; |
| 99 | while (1) { |
| 100 | current->state = TASK_INTERRUPTIBLE; |
| 101 | schedule(); |
| 102 | if (do_signal(regs, &saveset)) |
| 103 | return -EINTR; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | asmlinkage int |
| 108 | sys_sigaction(int sig, const struct old_sigaction *act, |
| 109 | struct old_sigaction *oact) |
| 110 | { |
| 111 | struct k_sigaction new_ka, old_ka; |
| 112 | int ret; |
| 113 | |
| 114 | if (act) { |
| 115 | old_sigset_t mask; |
| 116 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 117 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 118 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| 119 | return -EFAULT; |
| 120 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 121 | __get_user(mask, &act->sa_mask); |
| 122 | siginitset(&new_ka.sa.sa_mask, mask); |
| 123 | } |
| 124 | |
| 125 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 126 | |
| 127 | if (!ret && oact) { |
| 128 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 129 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 130 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| 131 | return -EFAULT; |
| 132 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 133 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 134 | } |
| 135 | |
| 136 | return ret; |
| 137 | } |
| 138 | |
| 139 | asmlinkage int |
| 140 | sys_sigaltstack(const stack_t *uss, stack_t *uoss) |
| 141 | { |
| 142 | return do_sigaltstack(uss, uoss, rdusp()); |
| 143 | } |
| 144 | |
| 145 | |
| 146 | /* |
| 147 | * Do a signal return; undo the signal stack. |
| 148 | * |
| 149 | * Keep the return code on the stack quadword aligned! |
| 150 | * That makes the cache flush below easier. |
| 151 | */ |
| 152 | |
| 153 | struct sigframe |
| 154 | { |
| 155 | long dummy_er0; |
| 156 | long dummy_vector; |
| 157 | #if defined(CONFIG_CPU_H8S) |
| 158 | short dummy_exr; |
| 159 | #endif |
| 160 | long dummy_pc; |
| 161 | char *pretcode; |
| 162 | unsigned char retcode[8]; |
| 163 | unsigned long extramask[_NSIG_WORDS-1]; |
| 164 | struct sigcontext sc; |
| 165 | int sig; |
| 166 | } __attribute__((aligned(2),packed)); |
| 167 | |
| 168 | struct rt_sigframe |
| 169 | { |
| 170 | long dummy_er0; |
| 171 | long dummy_vector; |
| 172 | #if defined(CONFIG_CPU_H8S) |
| 173 | short dummy_exr; |
| 174 | #endif |
| 175 | long dummy_pc; |
| 176 | char *pretcode; |
| 177 | struct siginfo *pinfo; |
| 178 | void *puc; |
| 179 | unsigned char retcode[8]; |
| 180 | struct siginfo info; |
| 181 | struct ucontext uc; |
| 182 | int sig; |
| 183 | } __attribute__((aligned(2),packed)); |
| 184 | |
| 185 | static inline int |
| 186 | restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, |
| 187 | int *pd0) |
| 188 | { |
| 189 | int err = 0; |
| 190 | unsigned int ccr; |
| 191 | unsigned int usp; |
| 192 | unsigned int er0; |
| 193 | |
| 194 | /* Always make any pending restarted system calls return -EINTR */ |
| 195 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 196 | |
| 197 | #define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */ |
| 198 | COPY(er1); |
| 199 | COPY(er2); |
| 200 | COPY(er3); |
| 201 | COPY(er5); |
| 202 | COPY(pc); |
| 203 | ccr = regs->ccr & 0x10; |
| 204 | COPY(ccr); |
| 205 | #undef COPY |
| 206 | regs->ccr &= 0xef; |
| 207 | regs->ccr |= ccr; |
| 208 | regs->orig_er0 = -1; /* disable syscall checks */ |
| 209 | err |= __get_user(usp, &usc->sc_usp); |
| 210 | wrusp(usp); |
| 211 | |
| 212 | err |= __get_user(er0, &usc->sc_er0); |
| 213 | *pd0 = er0; |
| 214 | return err; |
| 215 | } |
| 216 | |
| 217 | asmlinkage int do_sigreturn(unsigned long __unused,...) |
| 218 | { |
| 219 | struct pt_regs *regs = (struct pt_regs *) (&__unused - 1); |
| 220 | unsigned long usp = rdusp(); |
| 221 | struct sigframe *frame = (struct sigframe *)(usp - 4); |
| 222 | sigset_t set; |
| 223 | int er0; |
| 224 | |
| 225 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 226 | goto badframe; |
| 227 | if (__get_user(set.sig[0], &frame->sc.sc_mask) || |
| 228 | (_NSIG_WORDS > 1 && |
| 229 | __copy_from_user(&set.sig[1], &frame->extramask, |
| 230 | sizeof(frame->extramask)))) |
| 231 | goto badframe; |
| 232 | |
| 233 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 234 | spin_lock_irq(¤t->sighand->siglock); |
| 235 | current->blocked = set; |
| 236 | recalc_sigpending(); |
| 237 | spin_unlock_irq(¤t->sighand->siglock); |
| 238 | |
| 239 | if (restore_sigcontext(regs, &frame->sc, &er0)) |
| 240 | goto badframe; |
| 241 | return er0; |
| 242 | |
| 243 | badframe: |
| 244 | force_sig(SIGSEGV, current); |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | asmlinkage int do_rt_sigreturn(unsigned long __unused,...) |
| 249 | { |
| 250 | struct pt_regs *regs = (struct pt_regs *) &__unused; |
| 251 | unsigned long usp = rdusp(); |
| 252 | struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4); |
| 253 | sigset_t set; |
| 254 | int er0; |
| 255 | |
| 256 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 257 | goto badframe; |
| 258 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 259 | goto badframe; |
| 260 | |
| 261 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 262 | spin_unlock_irq(¤t->sighand->siglock); |
| 263 | current->blocked = set; |
| 264 | recalc_sigpending(); |
| 265 | spin_lock_irq(¤t->sighand->siglock); |
| 266 | |
| 267 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0)) |
| 268 | goto badframe; |
| 269 | |
| 270 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT) |
| 271 | goto badframe; |
| 272 | |
| 273 | return er0; |
| 274 | |
| 275 | badframe: |
| 276 | force_sig(SIGSEGV, current); |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
| 281 | unsigned long mask) |
| 282 | { |
| 283 | int err = 0; |
| 284 | |
| 285 | err |= __put_user(regs->er0, &sc->sc_er0); |
| 286 | err |= __put_user(regs->er1, &sc->sc_er1); |
| 287 | err |= __put_user(regs->er2, &sc->sc_er2); |
| 288 | err |= __put_user(regs->er3, &sc->sc_er3); |
| 289 | err |= __put_user(regs->er4, &sc->sc_er4); |
| 290 | err |= __put_user(regs->er5, &sc->sc_er5); |
| 291 | err |= __put_user(regs->er6, &sc->sc_er6); |
| 292 | err |= __put_user(rdusp(), &sc->sc_usp); |
| 293 | err |= __put_user(regs->pc, &sc->sc_pc); |
| 294 | err |= __put_user(regs->ccr, &sc->sc_ccr); |
| 295 | err |= __put_user(mask, &sc->sc_mask); |
| 296 | |
| 297 | return err; |
| 298 | } |
| 299 | |
| 300 | static inline void * |
| 301 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) |
| 302 | { |
| 303 | unsigned long usp; |
| 304 | |
| 305 | /* Default to using normal stack. */ |
| 306 | usp = rdusp(); |
| 307 | |
| 308 | /* This is the X/Open sanctioned signal stack switching. */ |
| 309 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 310 | if (!on_sig_stack(usp)) |
| 311 | usp = current->sas_ss_sp + current->sas_ss_size; |
| 312 | } |
| 313 | return (void *)((usp - frame_size) & -8UL); |
| 314 | } |
| 315 | |
| 316 | static void setup_frame (int sig, struct k_sigaction *ka, |
| 317 | sigset_t *set, struct pt_regs *regs) |
| 318 | { |
| 319 | struct sigframe *frame; |
| 320 | int err = 0; |
| 321 | int usig; |
| 322 | unsigned char *ret; |
| 323 | |
| 324 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 325 | |
| 326 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 327 | goto give_sigsegv; |
| 328 | |
| 329 | usig = current_thread_info()->exec_domain |
| 330 | && current_thread_info()->exec_domain->signal_invmap |
| 331 | && sig < 32 |
| 332 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 333 | : sig; |
| 334 | |
| 335 | err |= __put_user(usig, &frame->sig); |
| 336 | if (err) |
| 337 | goto give_sigsegv; |
| 338 | |
| 339 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); |
| 340 | if (err) |
| 341 | goto give_sigsegv; |
| 342 | |
| 343 | if (_NSIG_WORDS > 1) { |
| 344 | err |= copy_to_user(frame->extramask, &set->sig[1], |
| 345 | sizeof(frame->extramask)); |
| 346 | if (err) |
| 347 | goto give_sigsegv; |
| 348 | } |
| 349 | |
| 350 | ret = frame->retcode; |
| 351 | if (ka->sa.sa_flags & SA_RESTORER) |
| 352 | ret = (unsigned char *)(ka->sa.sa_restorer); |
| 353 | else { |
| 354 | /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */ |
| 355 | err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff), |
| 356 | (unsigned long *)(frame->retcode + 0)); |
| 357 | err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4)); |
| 358 | } |
| 359 | |
| 360 | /* Set up to return from userspace. */ |
| 361 | err |= __put_user(ret, &frame->pretcode); |
| 362 | |
| 363 | if (err) |
| 364 | goto give_sigsegv; |
| 365 | |
| 366 | /* Set up registers for signal handler */ |
| 367 | wrusp ((unsigned long) frame); |
| 368 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 369 | regs->er0 = (current_thread_info()->exec_domain |
| 370 | && current_thread_info()->exec_domain->signal_invmap |
| 371 | && sig < 32 |
| 372 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 373 | : sig); |
| 374 | regs->er1 = (unsigned long)&(frame->sc); |
| 375 | regs->er5 = current->mm->start_data; /* GOT base */ |
| 376 | |
| 377 | return; |
| 378 | |
| 379 | give_sigsegv: |
| 380 | force_sigsegv(sig, current); |
| 381 | } |
| 382 | |
| 383 | static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, |
| 384 | sigset_t *set, struct pt_regs *regs) |
| 385 | { |
| 386 | struct rt_sigframe *frame; |
| 387 | int err = 0; |
| 388 | int usig; |
| 389 | unsigned char *ret; |
| 390 | |
| 391 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 392 | |
| 393 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 394 | goto give_sigsegv; |
| 395 | |
| 396 | usig = current_thread_info()->exec_domain |
| 397 | && current_thread_info()->exec_domain->signal_invmap |
| 398 | && sig < 32 |
| 399 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 400 | : sig; |
| 401 | |
| 402 | err |= __put_user(usig, &frame->sig); |
| 403 | if (err) |
| 404 | goto give_sigsegv; |
| 405 | |
| 406 | err |= __put_user(&frame->info, &frame->pinfo); |
| 407 | err |= __put_user(&frame->uc, &frame->puc); |
| 408 | err |= copy_siginfo_to_user(&frame->info, info); |
| 409 | if (err) |
| 410 | goto give_sigsegv; |
| 411 | |
| 412 | /* Create the ucontext. */ |
| 413 | err |= __put_user(0, &frame->uc.uc_flags); |
| 414 | err |= __put_user(0, &frame->uc.uc_link); |
| 415 | err |= __put_user((void *)current->sas_ss_sp, |
| 416 | &frame->uc.uc_stack.ss_sp); |
| 417 | err |= __put_user(sas_ss_flags(rdusp()), |
| 418 | &frame->uc.uc_stack.ss_flags); |
| 419 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 420 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); |
| 421 | err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 422 | if (err) |
| 423 | goto give_sigsegv; |
| 424 | |
| 425 | /* Set up to return from userspace. */ |
| 426 | ret = frame->retcode; |
| 427 | if (ka->sa.sa_flags & SA_RESTORER) |
| 428 | ret = (unsigned char *)(ka->sa.sa_restorer); |
| 429 | else { |
| 430 | /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */ |
| 431 | err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff), |
| 432 | (unsigned long *)(frame->retcode + 0)); |
| 433 | err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4)); |
| 434 | } |
| 435 | err |= __put_user(ret, &frame->pretcode); |
| 436 | |
| 437 | if (err) |
| 438 | goto give_sigsegv; |
| 439 | |
| 440 | /* Set up registers for signal handler */ |
| 441 | wrusp ((unsigned long) frame); |
| 442 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 443 | regs->er0 = (current_thread_info()->exec_domain |
| 444 | && current_thread_info()->exec_domain->signal_invmap |
| 445 | && sig < 32 |
| 446 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 447 | : sig); |
| 448 | regs->er1 = (unsigned long)&(frame->info); |
| 449 | regs->er2 = (unsigned long)&frame->uc; |
| 450 | regs->er5 = current->mm->start_data; /* GOT base */ |
| 451 | |
| 452 | return; |
| 453 | |
| 454 | give_sigsegv: |
| 455 | force_sigsegv(sig, current); |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * OK, we're invoking a handler |
| 460 | */ |
| 461 | static void |
| 462 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
| 463 | sigset_t *oldset, struct pt_regs * regs) |
| 464 | { |
| 465 | /* are we from a system call? */ |
| 466 | if (regs->orig_er0 >= 0) { |
| 467 | switch (regs->er0) { |
| 468 | case -ERESTART_RESTARTBLOCK: |
| 469 | case -ERESTARTNOHAND: |
| 470 | regs->er0 = -EINTR; |
| 471 | break; |
| 472 | |
| 473 | case -ERESTARTSYS: |
| 474 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
| 475 | regs->er0 = -EINTR; |
| 476 | break; |
| 477 | } |
| 478 | /* fallthrough */ |
| 479 | case -ERESTARTNOINTR: |
| 480 | regs->er0 = regs->orig_er0; |
| 481 | regs->pc -= 2; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /* set up the stack frame */ |
| 486 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 487 | setup_rt_frame(sig, ka, info, oldset, regs); |
| 488 | else |
| 489 | setup_frame(sig, ka, oldset, regs); |
| 490 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 491 | spin_lock_irq(¤t->sighand->siglock); |
| 492 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 493 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | sigaddset(¤t->blocked,sig); |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 495 | recalc_sigpending(); |
| 496 | spin_unlock_irq(¤t->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | /* |
| 500 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 501 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 502 | * mistake. |
| 503 | */ |
| 504 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset) |
| 505 | { |
| 506 | siginfo_t info; |
| 507 | int signr; |
| 508 | struct k_sigaction ka; |
| 509 | |
| 510 | /* |
| 511 | * We want the common case to go fast, which |
| 512 | * is why we may in certain cases get here from |
| 513 | * kernel mode. Just return without doing anything |
| 514 | * if so. |
| 515 | */ |
| 516 | if ((regs->ccr & 0x10)) |
| 517 | return 1; |
| 518 | |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 519 | if (try_to_freeze()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | goto no_signal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | current->thread.esp0 = (unsigned long) regs; |
| 523 | |
| 524 | if (!oldset) |
| 525 | oldset = ¤t->blocked; |
| 526 | |
| 527 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 528 | if (signr > 0) { |
| 529 | /* Whee! Actually deliver the signal. */ |
| 530 | handle_signal(signr, &info, &ka, oldset, regs); |
| 531 | return 1; |
| 532 | } |
| 533 | no_signal: |
| 534 | /* Did we come from a system call? */ |
| 535 | if (regs->orig_er0 >= 0) { |
| 536 | /* Restart the system call - no handlers present */ |
| 537 | if (regs->er0 == -ERESTARTNOHAND || |
| 538 | regs->er0 == -ERESTARTSYS || |
| 539 | regs->er0 == -ERESTARTNOINTR) { |
| 540 | regs->er0 = regs->orig_er0; |
| 541 | regs->pc -= 2; |
| 542 | } |
| 543 | if (regs->er0 == -ERESTART_RESTARTBLOCK){ |
| 544 | regs->er0 = __NR_restart_syscall; |
| 545 | regs->pc -= 2; |
| 546 | } |
| 547 | } |
| 548 | return 0; |
| 549 | } |