arch/sh/kernel/signal.c

   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  */
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/smp.h>
  14 #include <linux/smp_lock.h>
  15 #include <linux/kernel.h>
  16 #include <linux/signal.h>
  17 #include <linux/errno.h>
  18 #include <linux/wait.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/unistd.h>
  21 #include <linux/stddef.h>
  22 #include <linux/tty.h>
  23 #include <linux/elf.h>
  24 #include <linux/personality.h>
  25 #include <linux/binfmts.h>
  26
  27 #include <asm/ucontext.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/cacheflush.h>
  31
  32 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  33
  34 /*
  35  * Atomically swap in the new signal mask, and wait for a signal.
  36  */
  37 asmlinkage int
  38 sys_sigsuspend(old_sigset_t mask,
  39                unsigned long r5, unsigned long r6, unsigned long r7,
  40                struct pt_regs regs)
  41 {
  42         mask &= _BLOCKABLE;
  43         spin_lock_irq(&current->sighand->siglock);
  44         current->saved_sigmask = current->blocked;
  45         siginitset(&current->blocked, mask);
  46         recalc_sigpending();
  47         spin_unlock_irq(&current->sighand->siglock);
  48
  49         current->state = TASK_INTERRUPTIBLE;
  50         schedule();
  51         set_thread_flag(TIF_RESTORE_SIGMASK);
  52         return -ERESTARTNOHAND;
  53 }
  54
  55 asmlinkage int
  56 sys_sigaction(int sig, const struct old_sigaction __user *act,
  57               struct old_sigaction __user *oact)
  58 {
  59         struct k_sigaction new_ka, old_ka;
  60         int ret;
  61
  62         if (act) {
  63                 old_sigset_t mask;
  64                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
  65                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
  66                     __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
  67                         return -EFAULT;
  68                 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
  69                 __get_user(mask, &act->sa_mask);
  70                 siginitset(&new_ka.sa.sa_mask, mask);
  71         }
  72
  73         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
  74
  75         if (!ret && oact) {
  76                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
  77                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
  78                     __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
  79                         return -EFAULT;
  80                 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
  81                 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
  82         }
  83
  84         return ret;
  85 }
  86
  87 asmlinkage int
  88 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
  89                 unsigned long r6, unsigned long r7,
  90                 struct pt_regs regs)
  91 {
  92         return do_sigaltstack(uss, uoss, regs.regs[15]);
  93 }
  94
  95
  96 /*
  97  * Do a signal return; undo the signal stack.
  98  */
  99
 100 #define MOVW(n)  (0x9300|((n)-2))       /* Move mem word at PC+n to R3 */
 101 #define TRAP16   0xc310                 /* Syscall w/no args (NR in R3) */
 102 #define OR_R0_R0 0x200b                 /* or r0,r0 (insert to avoid hardware bug) */
 103
 104 struct sigframe
 105 {
 106         struct sigcontext sc;
 107         unsigned long extramask[_NSIG_WORDS-1];
 108         u16 retcode[8];
 109 };
 110
 111 struct rt_sigframe
 112 {
 113         struct siginfo info;
 114         struct ucontext uc;
 115         u16 retcode[8];
 116 };
 117
 118 #ifdef CONFIG_SH_FPU
 119 static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
 120 {
 121         struct task_struct *tsk = current;
 122
 123         if (!(cpu_data->flags & CPU_HAS_FPU))
 124                 return 0;
 125
 126         set_used_math();
 127         return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
 128                                 sizeof(long)*(16*2+2));
 129 }
 130
 131 static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
 132                                       struct pt_regs *regs)
 133 {
 134         struct task_struct *tsk = current;
 135
 136         if (!(cpu_data->flags & CPU_HAS_FPU))
 137                 return 0;
 138
 139         if (!used_math()) {
 140                 __put_user(0, &sc->sc_ownedfp);
 141                 return 0;
 142         }
 143
 144         __put_user(1, &sc->sc_ownedfp);
 145
 146         /* This will cause a "finit" to be triggered by the next
 147            attempted FPU operation by the 'current' process.
 148            */
 149         clear_used_math();
 150
 151         unlazy_fpu(tsk, regs);
 152         return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
 153                               sizeof(long)*(16*2+2));
 154 }
 155 #endif /* CONFIG_SH_FPU */
 156
 157 static int
 158 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
 159 {
 160         unsigned int err = 0;
 161
 162 #define COPY(x)         err |= __get_user(regs->x, &sc->sc_##x)
 163                         COPY(regs[1]);
 164         COPY(regs[2]);  COPY(regs[3]);
 165         COPY(regs[4]);  COPY(regs[5]);
 166         COPY(regs[6]);  COPY(regs[7]);
 167         COPY(regs[8]);  COPY(regs[9]);
 168         COPY(regs[10]); COPY(regs[11]);
 169         COPY(regs[12]); COPY(regs[13]);
 170         COPY(regs[14]); COPY(regs[15]);
 171         COPY(gbr);      COPY(mach);
 172         COPY(macl);     COPY(pr);
 173         COPY(sr);       COPY(pc);
 174 #undef COPY
 175
 176 #ifdef CONFIG_SH_FPU
 177         if (cpu_data->flags & CPU_HAS_FPU) {
 178                 int owned_fp;
 179                 struct task_struct *tsk = current;
 180
 181                 regs->sr |= SR_FD; /* Release FPU */
 182                 clear_fpu(tsk, regs);
 183                 clear_used_math();
 184                 __get_user (owned_fp, &sc->sc_ownedfp);
 185                 if (owned_fp)
 186                         err |= restore_sigcontext_fpu(sc);
 187         }
 188 #endif
 189
 190         regs->tra = -1;         /* disable syscall checks */
 191         err |= __get_user(*r0_p, &sc->sc_regs[0]);
 192         return err;
 193 }
 194
 195 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
 196                              unsigned long r6, unsigned long r7,
 197                              struct pt_regs regs)
 198 {
 199         struct sigframe __user *frame = (struct sigframe __user *)regs.regs[15];
 200         sigset_t set;
 201         int r0;
 202
 203         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 204                 goto badframe;
 205
 206         if (__get_user(set.sig[0], &frame->sc.oldmask)
 207             || (_NSIG_WORDS > 1
 208                 && __copy_from_user(&set.sig[1], &frame->extramask,
 209                                     sizeof(frame->extramask))))
 210                 goto badframe;
 211
 212         sigdelsetmask(&set, ~_BLOCKABLE);
 213
 214         spin_lock_irq(&current->sighand->siglock);
 215         current->blocked = set;
 216         recalc_sigpending();
 217         spin_unlock_irq(&current->sighand->siglock);
 218
 219         if (restore_sigcontext(&regs, &frame->sc, &r0))
 220                 goto badframe;
 221         return r0;
 222
 223 badframe:
 224         force_sig(SIGSEGV, current);
 225         return 0;
 226 }
 227
 228 asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
 229                                 unsigned long r6, unsigned long r7,
 230                                 struct pt_regs regs)
 231 {
 232         struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.regs[15];
 233         sigset_t set;
 234         stack_t st;
 235         int r0;
 236
 237         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 238                 goto badframe;
 239
 240         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
 241                 goto badframe;
 242
 243         sigdelsetmask(&set, ~_BLOCKABLE);
 244         spin_lock_irq(&current->sighand->siglock);
 245         current->blocked = set;
 246         recalc_sigpending();
 247         spin_unlock_irq(&current->sighand->siglock);
 248
 249         if (restore_sigcontext(&regs, &frame->uc.uc_mcontext, &r0))
 250                 goto badframe;
 251
 252         if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
 253                 goto badframe;
 254         /* It is more difficult to avoid calling this function than to
 255            call it and ignore errors.  */
 256         do_sigaltstack(&st, NULL, regs.regs[15]);
 257
 258         return r0;
 259
 260 badframe:
 261         force_sig(SIGSEGV, current);
 262         return 0;
 263 }
 264
 265 /*
 266  * Set up a signal frame.
 267  */
 268
 269 static int
 270 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
 271                  unsigned long mask)
 272 {
 273         int err = 0;
 274
 275 #define COPY(x)         err |= __put_user(regs->x, &sc->sc_##x)
 276         COPY(regs[0]);  COPY(regs[1]);
 277         COPY(regs[2]);  COPY(regs[3]);
 278         COPY(regs[4]);  COPY(regs[5]);
 279         COPY(regs[6]);  COPY(regs[7]);
 280         COPY(regs[8]);  COPY(regs[9]);
 281         COPY(regs[10]); COPY(regs[11]);
 282         COPY(regs[12]); COPY(regs[13]);
 283         COPY(regs[14]); COPY(regs[15]);
 284         COPY(gbr);      COPY(mach);
 285         COPY(macl);     COPY(pr);
 286         COPY(sr);       COPY(pc);
 287 #undef COPY
 288
 289 #ifdef CONFIG_SH_FPU
 290         err |= save_sigcontext_fpu(sc, regs);
 291 #endif
 292
 293         /* non-iBCS2 extensions.. */
 294         err |= __put_user(mask, &sc->oldmask);
 295
 296         return err;
 297 }
 298
 299 /*
 300  * Determine which stack to use..
 301  */
 302 static inline void __user *
 303 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
 304 {
 305         if (ka->sa.sa_flags & SA_ONSTACK) {
 306                 if (sas_ss_flags(sp) == 0)
 307                         sp = current->sas_ss_sp + current->sas_ss_size;
 308         }
 309
 310         return (void __user *)((sp - frame_size) & -8ul);
 311 }
 312
 313 /* These symbols are defined with the addresses in the vsyscall page.
 314    See vsyscall-trapa.S.  */
 315 extern void __user __kernel_sigreturn;
 316 extern void __user __kernel_rt_sigreturn;
 317
 318 static int setup_frame(int sig, struct k_sigaction *ka,
 319                         sigset_t *set, struct pt_regs *regs)
 320 {
 321         struct sigframe __user *frame;
 322         int err = 0;
 323         int signal;
 324
 325         frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
 326
 327         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 328                 goto give_sigsegv;
 329
 330         signal = current_thread_info()->exec_domain
 331                 && current_thread_info()->exec_domain->signal_invmap
 332                 && sig < 32
 333                 ? current_thread_info()->exec_domain->signal_invmap[sig]
 334                 : sig;
 335
 336         err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
 337
 338         if (_NSIG_WORDS > 1)
 339                 err |= __copy_to_user(frame->extramask, &set->sig[1],
 340                                       sizeof(frame->extramask));
 341
 342         /* Set up to return from userspace.  If provided, use a stub
 343            already in userspace.  */
 344         if (ka->sa.sa_flags & SA_RESTORER) {
 345                 regs->pr = (unsigned long) ka->sa.sa_restorer;
 346 #ifdef CONFIG_VSYSCALL
 347         } else if (likely(current->mm->context.vdso)) {
 348                 regs->pr = VDSO_SYM(&__kernel_sigreturn);
 349 #endif
 350         } else {
 351                 /* Generate return code (system call to sigreturn) */
 352                 err |= __put_user(MOVW(7), &frame->retcode[0]);
 353                 err |= __put_user(TRAP16, &frame->retcode[1]);
 354                 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
 355                 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
 356                 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
 357                 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
 358                 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
 359                 err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
 360                 regs->pr = (unsigned long) frame->retcode;
 361         }
 362
 363         if (err)
 364                 goto give_sigsegv;
 365
 366         /* Set up registers for signal handler */
 367         regs->regs[15] = (unsigned long) frame;
 368         regs->regs[4] = signal; /* Arg for signal handler */
 369         regs->regs[5] = 0;
 370         regs->regs[6] = (unsigned long) &frame->sc;
 371         regs->pc = (unsigned long) ka->sa.sa_handler;
 372
 373         set_fs(USER_DS);
 374
 375         pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
 376                  current->comm, current->pid, frame, regs->pc, regs->pr);
 377
 378         flush_cache_sigtramp(regs->pr);
 379
 380         if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
 381                 flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
 382
 383         return 0;
 384
 385 give_sigsegv:
 386         force_sigsegv(sig, current);
 387         return -EFAULT;
 388 }
 389
 390 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 391                            sigset_t *set, struct pt_regs *regs)
 392 {
 393         struct rt_sigframe __user *frame;
 394         int err = 0;
 395         int signal;
 396
 397         frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
 398
 399         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 400                 goto give_sigsegv;
 401
 402         signal = current_thread_info()->exec_domain
 403                 && current_thread_info()->exec_domain->signal_invmap
 404                 && sig < 32
 405                 ? current_thread_info()->exec_domain->signal_invmap[sig]
 406                 : sig;
 407
 408         err |= copy_siginfo_to_user(&frame->info, info);
 409
 410         /* Create the ucontext.  */
 411         err |= __put_user(0, &frame->uc.uc_flags);
 412         err |= __put_user(0, &frame->uc.uc_link);
 413         err |= __put_user((void *)current->sas_ss_sp,
 414                           &frame->uc.uc_stack.ss_sp);
 415         err |= __put_user(sas_ss_flags(regs->regs[15]),
 416                           &frame->uc.uc_stack.ss_flags);
 417         err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
 418         err |= setup_sigcontext(&frame->uc.uc_mcontext,
 419                                 regs, set->sig[0]);
 420         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 421
 422         /* Set up to return from userspace.  If provided, use a stub
 423            already in userspace.  */
 424         if (ka->sa.sa_flags & SA_RESTORER) {
 425                 regs->pr = (unsigned long) ka->sa.sa_restorer;
 426 #ifdef CONFIG_VSYSCALL
 427         } else if (likely(current->mm->context.vdso)) {
 428                 regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
 429 #endif
 430         } else {
 431                 /* Generate return code (system call to rt_sigreturn) */
 432                 err |= __put_user(MOVW(7), &frame->retcode[0]);
 433                 err |= __put_user(TRAP16, &frame->retcode[1]);
 434                 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
 435                 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
 436                 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
 437                 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
 438                 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
 439                 err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
 440                 regs->pr = (unsigned long) frame->retcode;
 441         }
 442
 443         if (err)
 444                 goto give_sigsegv;
 445
 446         /* Set up registers for signal handler */
 447         regs->regs[15] = (unsigned long) frame;
 448         regs->regs[4] = signal; /* Arg for signal handler */
 449         regs->regs[5] = (unsigned long) &frame->info;
 450         regs->regs[6] = (unsigned long) &frame->uc;
 451         regs->pc = (unsigned long) ka->sa.sa_handler;
 452
 453         set_fs(USER_DS);
 454
 455         pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
 456                  current->comm, current->pid, frame, regs->pc, regs->pr);
 457
 458         flush_cache_sigtramp(regs->pr);
 459
 460         if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
 461                 flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
 462
 463         return 0;
 464
 465 give_sigsegv:
 466         force_sigsegv(sig, current);
 467         return -EFAULT;
 468 }
 469
 470 /*
 471  * OK, we're invoking a handler
 472  */
 473
 474 static int
 475 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 476               sigset_t *oldset, struct pt_regs *regs)
 477 {
 478         int ret;
 479
 480         /* Are we from a system call? */
 481         if (regs->tra >= 0) {
 482                 /* If so, check system call restarting.. */
 483                 switch (regs->regs[0]) {
 484                         case -ERESTARTNOHAND:
 485                                 regs->regs[0] = -EINTR;
 486                                 break;
 487
 488                         case -ERESTARTSYS:
 489                                 if (!(ka->sa.sa_flags & SA_RESTART)) {
 490                                         regs->regs[0] = -EINTR;
 491                                         break;
 492                                 }
 493                         /* fallthrough */
 494                         case -ERESTARTNOINTR:
 495                                 regs->pc -= 2;
 496                 }
 497         } else {
 498                 /* gUSA handling */
 499 #ifdef CONFIG_PREEMPT
 500                 unsigned long flags;
 501
 502                 local_irq_save(flags);
 503 #endif
 504                 if (regs->regs[15] >= 0xc0000000) {
 505                         int offset = (int)regs->regs[15];
 506
 507                         /* Reset stack pointer: clear critical region mark */
 508                         regs->regs[15] = regs->regs[1];
 509                         if (regs->pc < regs->regs[0])
 510                                 /* Go to rewind point #1 */
 511                                 regs->pc = regs->regs[0] + offset - 2;
 512                 }
 513 #ifdef CONFIG_PREEMPT
 514                 local_irq_restore(flags);
 515 #endif
 516         }
 517
 518         /* Set up the stack frame */
 519         if (ka->sa.sa_flags & SA_SIGINFO)
 520                 ret = setup_rt_frame(sig, ka, info, oldset, regs);
 521         else
 522                 ret = setup_frame(sig, ka, oldset, regs);
 523
 524         if (ka->sa.sa_flags & SA_ONESHOT)
 525                 ka->sa.sa_handler = SIG_DFL;
 526
 527         if (ret == 0) {
 528                 spin_lock_irq(&current->sighand->siglock);
 529                 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 530                 if (!(ka->sa.sa_flags & SA_NODEFER))
 531                         sigaddset(&current->blocked,sig);
 532                 recalc_sigpending();
 533                 spin_unlock_irq(&current->sighand->siglock);
 534         }
 535
 536         return ret;
 537 }
 538
 539 /*
 540  * Note that 'init' is a special process: it doesn't get signals it doesn't
 541  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 542  * mistake.
 543  *
 544  * Note that we go through the signals twice: once to check the signals that
 545  * the kernel can handle, and then we build all the user-level signal handling
 546  * stack-frames in one go after that.
 547  */
 548 static void do_signal(struct pt_regs *regs, unsigned int save_r0)
 549 {
 550         siginfo_t info;
 551         int signr;
 552         struct k_sigaction ka;
 553         sigset_t *oldset;
 554
 555         /*
 556          * We want the common case to go fast, which
 557          * is why we may in certain cases get here from
 558          * kernel mode. Just return without doing anything
 559          * if so.
 560          */
 561         if (!user_mode(regs))
 562                 return;
 563
 564         if (try_to_freeze())
 565                 goto no_signal;
 566
 567         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 568                 oldset = &current->saved_sigmask;
 569         else
 570                 oldset = &current->blocked;
 571
 572         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 573         if (signr > 0) {
 574                 /* Whee!  Actually deliver the signal.  */
 575                 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
 576                         /* a signal was successfully delivered; the saved
 577                          * sigmask will have been stored in the signal frame,
 578                          * and will be restored by sigreturn, so we can simply
 579                          * clear the TIF_RESTORE_SIGMASK flag */
 580                         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 581                                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 582                 }
 583         }
 584
 585  no_signal:
 586         /* Did we come from a system call? */
 587         if (regs->tra >= 0) {
 588                 /* Restart the system call - no handlers present */
 589                 if (regs->regs[0] == -ERESTARTNOHAND ||
 590                     regs->regs[0] == -ERESTARTSYS ||
 591                     regs->regs[0] == -ERESTARTNOINTR) {
 592                         regs->regs[0] = save_r0;
 593                         regs->pc -= 2;
 594                 } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
 595                         regs->pc -= 2;
 596                         regs->regs[3] = __NR_restart_syscall;
 597                 }
 598         }
 599
 600         /* if there's no signal to deliver, we just put the saved sigmask
 601          * back */
 602         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 603                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 604                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 605         }
 606 }
 607
 608 asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
 609                                  __u32 thread_info_flags)
 610 {
 611         /* deal with pending signal delivery */
 612         if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
 613                 do_signal(regs, save_r0);
 614 }