arch/ia64/kernel/signal.c

   1 /*
   2  * Architecture-specific signal handling support.
   3  *
   4  * Copyright (C) 1999-2000 Hewlett-Packard Co
   5  * Copyright (C) 1999-2000 David Mosberger-Tang <davidm@hpl.hp.com>
   6  *
   7  * Derived from i386 and Alpha versions.
   8  */
   9
  10 #include <linux/config.h>
  11 #include <linux/errno.h>
  12 #include <linux/kernel.h>
  13 #include <linux/mm.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/sched.h>
  16 #include <linux/signal.h>
  17 #include <linux/smp.h>
  18 #include <linux/smp_lock.h>
  19 #include <linux/stddef.h>
  20 #include <linux/unistd.h>
  21 #include <linux/wait.h>
  22
  23 #include <asm/ia32.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/rse.h>
  26 #include <asm/sigcontext.h>
  27
  28 #define DEBUG_SIG       0
  29 #define STACK_ALIGN     16              /* minimal alignment for stack pointer */
  30 #define _BLOCKABLE      (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  31
  32 #if _NSIG_WORDS > 1
  33 # define PUT_SIGSET(k,u)        __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
  34 # define GET_SIGSET(k,u)        __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
  35 #else
  36 # define PUT_SIGSET(k,u)        __put_user((k)->sig[0], &(u)->sig[0])
  37 # define GET_SIGSET(k,u)        __get_user((k)->sig[0], &(u)->sig[0])
  38 #endif
  39
  40 struct sigscratch {
  41 #ifdef CONFIG_IA64_NEW_UNWIND
  42         unsigned long scratch_unat;     /* ar.unat for the general registers saved in pt */
  43         unsigned long pad;
  44 #else
  45         struct switch_stack sw;
  46 #endif
  47         struct pt_regs pt;
  48 };
  49
  50 struct sigframe {
  51         struct siginfo info;
  52         struct sigcontext sc;
  53 };
  54
  55 extern long sys_wait4 (int, int *, int, struct rusage *);
  56 extern long ia64_do_signal (sigset_t *, struct sigscratch *, long);     /* forward decl */
  57
  58 long
  59 ia64_rt_sigsuspend (sigset_t *uset, size_t sigsetsize, struct sigscratch *scr)
  60 {
  61         sigset_t oldset, set;
  62
  63         /* XXX: Don't preclude handling different sized sigset_t's.  */
  64         if (sigsetsize != sizeof(sigset_t))
  65                 return -EINVAL;
  66         if (GET_SIGSET(&set, uset))
  67                 return -EFAULT;
  68
  69         sigdelsetmask(&set, ~_BLOCKABLE);
  70
  71         spin_lock_irq(&current->sigmask_lock);
  72         {
  73                 oldset = current->blocked;
  74                 current->blocked = set;
  75                 recalc_sigpending(current);
  76         }
  77         spin_unlock_irq(&current->sigmask_lock);
  78
  79         /*
  80          * The return below usually returns to the signal handler.  We need to
  81          * pre-set the correct error code here to ensure that the right values
  82          * get saved in sigcontext by ia64_do_signal.
  83          */
  84 #ifdef CONFIG_IA32_SUPPORT
  85         if (IS_IA32_PROCESS(&scr->pt)) {
  86                 scr->pt.r8 = -EINTR;
  87         } else
  88 #endif
  89         {
  90                 scr->pt.r8 = EINTR;
  91                 scr->pt.r10 = -1;
  92         }
  93         while (1) {
  94                 set_current_state(TASK_INTERRUPTIBLE);
  95                 schedule();
  96                 if (ia64_do_signal(&oldset, scr, 1))
  97                         return -EINTR;
  98         }
  99 }
 100
 101 asmlinkage long
 102 sys_sigaltstack (const stack_t *uss, stack_t *uoss, long arg2, long arg3, long arg4,
 103                  long arg5, long arg6, long arg7, long stack)
 104 {
 105         struct pt_regs *pt = (struct pt_regs *) &stack;
 106
 107         return do_sigaltstack(uss, uoss, pt->r12);
 108 }
 109
 110 static long
 111 restore_sigcontext (struct sigcontext *sc, struct sigscratch *scr)
 112 {
 113         unsigned long ip, flags, nat, um, cfm;
 114         long err;
 115
 116         /* restore scratch that always needs gets updated during signal delivery: */
 117         err = __get_user(flags, &sc->sc_flags);
 118
 119         err |= __get_user(nat, &sc->sc_nat);
 120         err |= __get_user(ip, &sc->sc_ip);                      /* instruction pointer */
 121         err |= __get_user(cfm, &sc->sc_cfm);
 122         err |= __get_user(um, &sc->sc_um);                      /* user mask */
 123         err |= __get_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
 124         err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
 125         err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
 126         err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
 127         err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
 128         err |= __get_user(scr->pt.pr, &sc->sc_pr);              /* predicates */
 129         err |= __get_user(scr->pt.b0, &sc->sc_br[0]);           /* b0 (rp) */
 130         err |= __get_user(scr->pt.b6, &sc->sc_br[6]);           /* b6 */
 131         err |= __get_user(scr->pt.b7, &sc->sc_br[7]);           /* b7 */
 132         err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 3*8);       /* r1-r3 */
 133         err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8);       /* r8-r11 */
 134         err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 4*8);     /* r12-r15 */
 135         err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8);    /* r16-r31 */
 136
 137         scr->pt.cr_ifs = cfm | (1UL << 63);
 138
 139         /* establish new instruction pointer: */
 140         scr->pt.cr_iip = ip & ~0x3UL;
 141         ia64_psr(&scr->pt)->ri = ip & 0x3;
 142         scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
 143
 144 #ifdef CONFIG_IA64_NEW_UNWIND
 145         scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
 146 #else
 147         ia64_put_nat_bits(&scr->pt, &scr->sw, nat);     /* restore the original scratch NaT bits */
 148 #endif
 149
 150         if (flags & IA64_SC_FLAG_FPH_VALID) {
 151                 struct task_struct *fpu_owner = ia64_get_fpu_owner();
 152
 153                 __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
 154                 if (fpu_owner == current) {
 155                         __ia64_load_fpu(current->thread.fph);
 156                 }
 157         }
 158         return err;
 159 }
 160
 161 int
 162 copy_siginfo_to_user (siginfo_t *to, siginfo_t *from)
 163 {
 164         if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t)))
 165                 return -EFAULT;
 166         if (from->si_code < 0)
 167                 return __copy_to_user(to, from, sizeof(siginfo_t));
 168         else {
 169                 int err;
 170
 171                 /*
 172                  * If you change siginfo_t structure, please be sure
 173                  * this code is fixed accordingly.  It should never
 174                  * copy any pad contained in the structure to avoid
 175                  * security leaks, but must copy the generic 3 ints
 176                  * plus the relevant union member.
 177                  */
 178                 err = __put_user(from->si_signo, &to->si_signo);
 179                 err |= __put_user(from->si_errno, &to->si_errno);
 180                 err |= __put_user((short)from->si_code, &to->si_code);
 181                 switch (from->si_code >> 16) {
 182                       case __SI_FAULT >> 16:
 183                         err |= __put_user(from->si_isr, &to->si_isr);
 184                       case __SI_POLL >> 16:
 185                         err |= __put_user(from->si_addr, &to->si_addr);
 186                         err |= __put_user(from->si_imm, &to->si_imm);
 187                         break;
 188                       case __SI_CHLD >> 16:
 189                         err |= __put_user(from->si_utime, &to->si_utime);
 190                         err |= __put_user(from->si_stime, &to->si_stime);
 191                         err |= __put_user(from->si_status, &to->si_status);
 192                       default:
 193                         err |= __put_user(from->si_uid, &to->si_uid);
 194                         err |= __put_user(from->si_pid, &to->si_pid);
 195                         break;
 196                       /* case __SI_RT: This is not generated by the kernel as of now.  */
 197                 }
 198                 return err;
 199         }
 200 }
 201
 202 long
 203 ia64_rt_sigreturn (struct sigscratch *scr)
 204 {
 205         extern char ia64_strace_leave_kernel, ia64_leave_kernel;
 206         struct sigcontext *sc;
 207         struct siginfo si;
 208         sigset_t set;
 209         long retval;
 210
 211         sc = &((struct sigframe *) (scr->pt.r12 + 16))->sc;
 212
 213         /*
 214          * When we return to the previously executing context, r8 and
 215          * r10 have already been setup the way we want them.  Indeed,
 216          * if the signal wasn't delivered while in a system call, we
 217          * must not touch r8 or r10 as otherwise user-level stat could
 218          * be corrupted.
 219          */
 220         retval = (long) &ia64_leave_kernel;
 221         if (current->ptrace & PT_TRACESYS)
 222                 /*
 223                  * strace expects to be notified after sigreturn
 224                  * returns even though the context to which we return
 225                  * may not be in the middle of a syscall.  Thus, the
 226                  * return-value that strace displays for sigreturn is
 227                  * meaningless.
 228                  */
 229                 retval = (long) &ia64_strace_leave_kernel;
 230
 231         if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
 232                 goto give_sigsegv;
 233
 234         if (GET_SIGSET(&set, &sc->sc_mask))
 235                 goto give_sigsegv;
 236
 237         sigdelsetmask(&set, ~_BLOCKABLE);
 238         spin_lock_irq(&current->sigmask_lock);
 239         current->blocked = set;
 240         recalc_sigpending(current);
 241         spin_unlock_irq(&current->sigmask_lock);
 242
 243         if (restore_sigcontext(sc, scr))
 244                 goto give_sigsegv;
 245
 246 #if DEBUG_SIG
 247         printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
 248                current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
 249 #endif
 250         /*
 251          * It is more difficult to avoid calling this function than to
 252          * call it and ignore errors.
 253          */
 254         do_sigaltstack(&sc->sc_stack, 0, scr->pt.r12);
 255         return retval;
 256
 257   give_sigsegv:
 258         si.si_signo = SIGSEGV;
 259         si.si_errno = 0;
 260         si.si_code = SI_KERNEL;
 261         si.si_pid = current->pid;
 262         si.si_uid = current->uid;
 263         si.si_addr = sc;
 264         force_sig_info(SIGSEGV, &si, current);
 265         return retval;
 266 }
 267
 268 /*
 269  * This does just the minimum required setup of sigcontext.
 270  * Specifically, it only installs data that is either not knowable at
 271  * the user-level or that gets modified before execution in the
 272  * trampoline starts.  Everything else is done at the user-level.
 273  */
 274 static long
 275 setup_sigcontext (struct sigcontext *sc, sigset_t *mask, struct sigscratch *scr)
 276 {
 277         struct task_struct *fpu_owner = ia64_get_fpu_owner();
 278         unsigned long flags = 0, ifs, nat;
 279         long err;
 280
 281         ifs = scr->pt.cr_ifs;
 282
 283         if (on_sig_stack((unsigned long) sc))
 284                 flags |= IA64_SC_FLAG_ONSTACK;
 285         if ((ifs & (1UL << 63)) == 0) {
 286                 /* if cr_ifs isn't valid, we got here through a syscall */
 287                 flags |= IA64_SC_FLAG_IN_SYSCALL;
 288         }
 289         if ((fpu_owner == current) || (current->thread.flags & IA64_THREAD_FPH_VALID)) {
 290                 flags |= IA64_SC_FLAG_FPH_VALID;
 291                 if (fpu_owner == current) {
 292                         __ia64_save_fpu(current->thread.fph);
 293                 }
 294                 __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
 295         }
 296
 297         /*
 298          * Note: sw->ar_unat is UNDEFINED unless the process is being
 299          * PTRACED.  However, this is OK because the NaT bits of the
 300          * preserved registers (r4-r7) are never being looked at by
 301          * the signal handler (registers r4-r7 are used instead).
 302          */
 303 #ifdef CONFIG_IA64_NEW_UNWIND
 304         nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
 305 #else
 306         nat = ia64_get_nat_bits(&scr->pt, &scr->sw);
 307 #endif
 308
 309         err  = __put_user(flags, &sc->sc_flags);
 310
 311         err |= __put_user(nat, &sc->sc_nat);
 312         err |= PUT_SIGSET(mask, &sc->sc_mask);
 313         err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
 314         err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
 315         err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
 316         err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat);            /* ar.unat */
 317         err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);            /* ar.fpsr */
 318         err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
 319         err |= __put_user(scr->pt.pr, &sc->sc_pr);                      /* predicates */
 320         err |= __put_user(scr->pt.b0, &sc->sc_br[0]);                   /* b0 (rp) */
 321         err |= __put_user(scr->pt.b6, &sc->sc_br[6]);                   /* b6 */
 322         err |= __put_user(scr->pt.b7, &sc->sc_br[7]);                   /* b7 */
 323
 324         err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 3*8);         /* r1-r3 */
 325         err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8);         /* r8-r11 */
 326         err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 4*8);       /* r12-r15 */
 327         err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8);      /* r16-r31 */
 328
 329         err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
 330         return err;
 331 }
 332
 333 static long
 334 setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
 335              struct sigscratch *scr)
 336 {
 337         extern char ia64_sigtramp[], __start_gate_section[];
 338         unsigned long tramp_addr, new_rbs = 0;
 339         struct sigframe *frame;
 340         struct siginfo si;
 341         long err;
 342
 343         frame = (void *) scr->pt.r12;
 344         tramp_addr = GATE_ADDR + (ia64_sigtramp - __start_gate_section);
 345         if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack((unsigned long) frame)) {
 346                 new_rbs  = (current->sas_ss_sp + sizeof(long) - 1) & ~(sizeof(long) - 1);
 347                 frame = (void *) ((current->sas_ss_sp + current->sas_ss_size)
 348                                   & ~(STACK_ALIGN - 1));
 349         }
 350         frame = (void *) frame - ((sizeof(*frame) + STACK_ALIGN - 1) & ~(STACK_ALIGN - 1));
 351
 352         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 353                 goto give_sigsegv;
 354
 355         err  = copy_siginfo_to_user(&frame->info, info);
 356
 357         err |= __put_user(current->sas_ss_sp, &frame->sc.sc_stack.ss_sp);
 358         err |= __put_user(current->sas_ss_size, &frame->sc.sc_stack.ss_size);
 359         err |= __put_user(sas_ss_flags(scr->pt.r12), &frame->sc.sc_stack.ss_flags);
 360         err |= setup_sigcontext(&frame->sc, set, scr);
 361
 362         if (err)
 363                 goto give_sigsegv;
 364
 365         scr->pt.r12 = (unsigned long) frame - 16;               /* new stack pointer */
 366         scr->pt.r2  = sig;                                      /* signal number */
 367         scr->pt.r3  = (unsigned long) ka->sa.sa_handler;        /* addr. of handler's proc desc */
 368         scr->pt.r15 = new_rbs;
 369         scr->pt.ar_fpsr = FPSR_DEFAULT;                 /* reset fpsr for signal handler */
 370         scr->pt.cr_iip = tramp_addr;
 371         ia64_psr(&scr->pt)->ri = 0;                     /* start executing in first slot */
 372
 373 #ifdef CONFIG_IA64_NEW_UNWIND
 374         /*
 375          * Note: this affects only the NaT bits of the scratch regs
 376          * (the ones saved in pt_regs), which is exactly what we want.
 377          */
 378         scr->scratch_unat = 0; /* ensure NaT bits of at least r2, r3, r12, and r15 are clear */
 379 #else
 380         /*
 381          * Note: this affects only the NaT bits of the scratch regs
 382          * (the ones saved in pt_regs), which is exactly what we want.
 383          * The NaT bits for the preserved regs (r4-r7) are in
 384          * sw->ar_unat iff this process is being PTRACED.
 385          */
 386         scr->sw.caller_unat = 0; /* ensure NaT bits of at least r2, r3, r12, and r15 are clear */
 387 #endif
 388
 389 #if DEBUG_SIG
 390         printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%lx\n",
 391                current->comm, current->pid, sig, scr->pt.r12, scr->pt.cr_iip, scr->pt.r3);
 392 #endif
 393         return 1;
 394
 395   give_sigsegv:
 396         if (sig == SIGSEGV)
 397                 ka->sa.sa_handler = SIG_DFL;
 398         si.si_signo = SIGSEGV;
 399         si.si_errno = 0;
 400         si.si_code = SI_KERNEL;
 401         si.si_pid = current->pid;
 402         si.si_uid = current->uid;
 403         si.si_addr = frame;
 404         force_sig_info(SIGSEGV, &si, current);
 405         return 0;
 406 }
 407
 408 static long
 409 handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset,
 410                struct sigscratch *scr)
 411 {
 412 #ifdef CONFIG_IA32_SUPPORT
 413         if (IS_IA32_PROCESS(&scr->pt)) {
 414                 /* send signal to IA-32 process */
 415                 if (!ia32_setup_frame1(sig, ka, info, oldset, &scr->pt))
 416                         return 0;
 417         } else
 418 #endif
 419         /* send signal to IA-64 process */
 420         if (!setup_frame(sig, ka, info, oldset, scr))
 421                 return 0;
 422
 423         if (ka->sa.sa_flags & SA_ONESHOT)
 424                 ka->sa.sa_handler = SIG_DFL;
 425
 426         if (!(ka->sa.sa_flags & SA_NODEFER)) {
 427                 spin_lock_irq(&current->sigmask_lock);
 428                 sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
 429                 sigaddset(&current->blocked, sig);
 430                 recalc_sigpending(current);
 431                 spin_unlock_irq(&current->sigmask_lock);
 432         }
 433         return 1;
 434 }
 435
 436 /*
 437  * Note that `init' is a special process: it doesn't get signals it
 438  * doesn't want to handle.  Thus you cannot kill init even with a
 439  * SIGKILL even by mistake.
 440  *
 441  * Note that we go through the signals twice: once to check the
 442  * signals that the kernel can handle, and then we build all the
 443  * user-level signal handling stack-frames in one go after that.
 444  */
 445 long
 446 ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 447 {
 448         struct k_sigaction *ka;
 449         siginfo_t info;
 450         long restart = in_syscall;
 451         long errno = scr->pt.r8;
 452
 453         /*
 454          * In the ia64_leave_kernel code path, we want the common case
 455          * to go fast, which is why we may in certain cases get here
 456          * from kernel mode. Just return without doing anything if so.
 457          */
 458         if (!user_mode(&scr->pt))
 459                 return 0;
 460
 461         if (!oldset)
 462                 oldset = &current->blocked;
 463
 464 #ifdef CONFIG_IA32_SUPPORT
 465         if (IS_IA32_PROCESS(&scr->pt)) {
 466                 if (in_syscall) {
 467                         if (errno >= 0)
 468                                 restart = 0;
 469                         else
 470                                 errno = -errno;
 471                 }
 472         } else
 473 #endif
 474         if (scr->pt.r10 != -1) {
 475                 /*
 476                  * A system calls has to be restarted only if one of
 477                  * the error codes ERESTARTNOHAND, ERESTARTSYS, or
 478                  * ERESTARTNOINTR is returned.  If r10 isn't -1 then
 479                  * r8 doesn't hold an error code and we don't need to
 480                  * restart the syscall, so we set in_syscall to zero.
 481                  */
 482                 restart = 0;
 483         }
 484
 485         for (;;) {
 486                 unsigned long signr;
 487
 488                 spin_lock_irq(&current->sigmask_lock);
 489                 signr = dequeue_signal(&current->blocked, &info);
 490                 spin_unlock_irq(&current->sigmask_lock);
 491
 492                 if (!signr)
 493                         break;
 494
 495                 if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
 496                         /* Let the debugger run.  */
 497                         current->exit_code = signr;
 498                         current->thread.siginfo = &info;
 499                         set_current_state(TASK_STOPPED);
 500                         notify_parent(current, SIGCHLD);
 501                         schedule();
 502                         signr = current->exit_code;
 503                         current->thread.siginfo = 0;
 504
 505                         /* We're back.  Did the debugger cancel the sig?  */
 506                         if (!signr)
 507                                 continue;
 508                         current->exit_code = 0;
 509
 510                         /* The debugger continued.  Ignore SIGSTOP.  */
 511                         if (signr == SIGSTOP)
 512                                 continue;
 513
 514                         /* Update the siginfo structure.  Is this good?  */
 515                         if (signr != info.si_signo) {
 516                                 info.si_signo = signr;
 517                                 info.si_errno = 0;
 518                                 info.si_code = SI_USER;
 519                                 info.si_pid = current->p_pptr->pid;
 520                                 info.si_uid = current->p_pptr->uid;
 521                         }
 522
 523                         /* If the (new) signal is now blocked, requeue it.  */
 524                         if (sigismember(&current->blocked, signr)) {
 525                                 send_sig_info(signr, &info, current);
 526                                 continue;
 527                         }
 528                 }
 529
 530                 ka = &current->sig->action[signr - 1];
 531                 if (ka->sa.sa_handler == SIG_IGN) {
 532                         if (signr != SIGCHLD)
 533                                 continue;
 534                         /* Check for SIGCHLD: it's special.  */
 535                         while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
 536                                 /* nothing */;
 537                         continue;
 538                 }
 539
 540                 if (ka->sa.sa_handler == SIG_DFL) {
 541                         int exit_code = signr;
 542
 543                         /* Init gets no signals it doesn't want.  */
 544                         if (current->pid == 1)
 545                                 continue;
 546
 547                         switch (signr) {
 548                               case SIGCONT: case SIGCHLD: case SIGWINCH:
 549                                 continue;
 550
 551                               case SIGTSTP: case SIGTTIN: case SIGTTOU:
 552                                 if (is_orphaned_pgrp(current->pgrp))
 553                                         continue;
 554                                 /* FALLTHRU */
 555
 556                               case SIGSTOP:
 557                                 set_current_state(TASK_STOPPED);
 558                                 current->exit_code = signr;
 559                                 if (!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags
 560                                       & SA_NOCLDSTOP))
 561                                         notify_parent(current, SIGCHLD);
 562                                 schedule();
 563                                 continue;
 564
 565                               case SIGQUIT: case SIGILL: case SIGTRAP:
 566                               case SIGABRT: case SIGFPE: case SIGSEGV:
 567                               case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
 568                                 if (do_coredump(signr, &scr->pt))
 569                                         exit_code |= 0x80;
 570                                 /* FALLTHRU */
 571
 572                               default:
 573                                 sigaddset(&current->pending.signal, signr);
 574                                 recalc_sigpending(current);
 575                                 current->flags |= PF_SIGNALED;
 576                                 do_exit(exit_code);
 577                                 /* NOTREACHED */
 578                         }
 579                 }
 580
 581                 if (restart) {
 582                         switch (errno) {
 583                               case ERESTARTSYS:
 584                                 if ((ka->sa.sa_flags & SA_RESTART) == 0) {
 585                               case ERESTARTNOHAND:
 586 #ifdef CONFIG_IA32_SUPPORT
 587                                         if (IS_IA32_PROCESS(&scr->pt))
 588                                                 scr->pt.r8 = -EINTR;
 589                                         else
 590 #endif
 591                                         scr->pt.r8 = EINTR;
 592                                         /* note: scr->pt.r10 is already -1 */
 593                                         break;
 594                                 }
 595                               case ERESTARTNOINTR:
 596 #ifdef CONFIG_IA32_SUPPORT
 597                                 if (IS_IA32_PROCESS(&scr->pt)) {
 598                                         scr->pt.r8 = scr->pt.r1;
 599                                         scr->pt.cr_iip -= 2;
 600                                 } else
 601 #endif
 602                                 ia64_decrement_ip(&scr->pt);
 603                         }
 604                 }
 605
 606                 /* Whee!  Actually deliver the signal.  If the
 607                    delivery failed, we need to continue to iterate in
 608                    this loop so we can deliver the SIGSEGV... */
 609                 if (handle_signal(signr, ka, &info, oldset, scr))
 610                         return 1;
 611         }
 612
 613         /* Did we come from a system call? */
 614         if (restart) {
 615                 /* Restart the system call - no handlers present */
 616                 if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR) {
 617 #ifdef CONFIG_IA32_SUPPORT
 618                         if (IS_IA32_PROCESS(&scr->pt)) {
 619                                 scr->pt.r8 = scr->pt.r1;
 620                                 scr->pt.cr_iip -= 2;
 621                         } else
 622 #endif
 623                         /*
 624                          * Note: the syscall number is in r15 which is
 625                          * saved in pt_regs so all we need to do here
 626                          * is adjust ip so that the "break"
 627                          * instruction gets re-executed.
 628                          */
 629                         ia64_decrement_ip(&scr->pt);
 630                 }
 631         }
 632         return 0;
 633 }