File: /usr/src/linux/arch/ia64/kernel/signal.c
1 /*
2 * Architecture-specific signal handling support.
3 *
4 * Copyright (C) 1999-2001 Hewlett-Packard Co
5 * Copyright (C) 1999-2001 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 #include "sigframe.h"
29
30 #define DEBUG_SIG 0
31 #define STACK_ALIGN 16 /* minimal alignment for stack pointer */
32 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
33
34 #if _NSIG_WORDS > 1
35 # define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
36 # define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
37 #else
38 # define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0])
39 # define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0])
40 #endif
41
42 struct sigscratch {
43 unsigned long scratch_unat; /* ar.unat for the general registers saved in pt */
44 unsigned long pad;
45 struct pt_regs pt;
46 };
47
48 extern long ia64_do_signal (sigset_t *, struct sigscratch *, long); /* forward decl */
49
50 long
51 ia64_rt_sigsuspend (sigset_t *uset, size_t sigsetsize, struct sigscratch *scr)
52 {
53 sigset_t oldset, set;
54
55 /* XXX: Don't preclude handling different sized sigset_t's. */
56 if (sigsetsize != sizeof(sigset_t))
57 return -EINVAL;
58 if (GET_SIGSET(&set, uset))
59 return -EFAULT;
60
61 sigdelsetmask(&set, ~_BLOCKABLE);
62
63 spin_lock_irq(¤t->sigmask_lock);
64 {
65 oldset = current->blocked;
66 current->blocked = set;
67 recalc_sigpending(current);
68 }
69 spin_unlock_irq(¤t->sigmask_lock);
70
71 /*
72 * The return below usually returns to the signal handler. We need to
73 * pre-set the correct error code here to ensure that the right values
74 * get saved in sigcontext by ia64_do_signal.
75 */
76 #ifdef CONFIG_IA32_SUPPORT
77 if (IS_IA32_PROCESS(&scr->pt)) {
78 scr->pt.r8 = -EINTR;
79 } else
80 #endif
81 {
82 scr->pt.r8 = EINTR;
83 scr->pt.r10 = -1;
84 }
85 while (1) {
86 current->state = TASK_INTERRUPTIBLE;
87 schedule();
88 if (ia64_do_signal(&oldset, scr, 1))
89 return -EINTR;
90 }
91 }
92
93 asmlinkage long
94 sys_sigaltstack (const stack_t *uss, stack_t *uoss, long arg2, long arg3, long arg4,
95 long arg5, long arg6, long arg7, long stack)
96 {
97 struct pt_regs *pt = (struct pt_regs *) &stack;
98
99 return do_sigaltstack(uss, uoss, pt->r12);
100 }
101
102 static long
103 restore_sigcontext (struct sigcontext *sc, struct sigscratch *scr)
104 {
105 unsigned long ip, flags, nat, um, cfm;
106 long err;
107
108 /* restore scratch that always needs gets updated during signal delivery: */
109 err = __get_user(flags, &sc->sc_flags);
110
111 err |= __get_user(nat, &sc->sc_nat);
112 err |= __get_user(ip, &sc->sc_ip); /* instruction pointer */
113 err |= __get_user(cfm, &sc->sc_cfm);
114 err |= __get_user(um, &sc->sc_um); /* user mask */
115 err |= __get_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
116 err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
117 err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
118 err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
119 err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
120 err |= __get_user(scr->pt.pr, &sc->sc_pr); /* predicates */
121 err |= __get_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
122 err |= __get_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
123 err |= __get_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
124 err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 3*8); /* r1-r3 */
125 err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8); /* r8-r11 */
126 err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 4*8); /* r12-r15 */
127 err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8); /* r16-r31 */
128
129 scr->pt.cr_ifs = cfm | (1UL << 63);
130
131 /* establish new instruction pointer: */
132 scr->pt.cr_iip = ip & ~0x3UL;
133 ia64_psr(&scr->pt)->ri = ip & 0x3;
134 scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
135
136 scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
137
138 if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
139 struct ia64_psr *psr = ia64_psr(&scr->pt);
140
141 __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
142 if (!psr->dfh) {
143 psr->mfh = 0;
144 __ia64_load_fpu(current->thread.fph);
145 }
146 }
147 return err;
148 }
149
150 int
151 copy_siginfo_to_user (siginfo_t *to, siginfo_t *from)
152 {
153 if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t)))
154 return -EFAULT;
155 if (from->si_code < 0)
156 return __copy_to_user(to, from, sizeof(siginfo_t));
157 else {
158 int err;
159
160 /*
161 * If you change siginfo_t structure, please be sure
162 * this code is fixed accordingly. It should never
163 * copy any pad contained in the structure to avoid
164 * security leaks, but must copy the generic 3 ints
165 * plus the relevant union member.
166 */
167 err = __put_user(from->si_signo, &to->si_signo);
168 err |= __put_user(from->si_errno, &to->si_errno);
169 err |= __put_user((short)from->si_code, &to->si_code);
170 switch (from->si_code >> 16) {
171 case __SI_FAULT >> 16:
172 err |= __put_user(from->si_isr, &to->si_isr);
173 case __SI_POLL >> 16:
174 err |= __put_user(from->si_addr, &to->si_addr);
175 err |= __put_user(from->si_imm, &to->si_imm);
176 break;
177 case __SI_CHLD >> 16:
178 err |= __put_user(from->si_utime, &to->si_utime);
179 err |= __put_user(from->si_stime, &to->si_stime);
180 err |= __put_user(from->si_status, &to->si_status);
181 case __SI_PROF >> 16:
182 err |= __put_user(from->si_uid, &to->si_uid);
183 err |= __put_user(from->si_pid, &to->si_pid);
184 err |= __put_user(from->si_pfm_ovfl, &to->si_pfm_ovfl);
185 break;
186 default:
187 err |= __put_user(from->si_uid, &to->si_uid);
188 err |= __put_user(from->si_pid, &to->si_pid);
189 break;
190 /* case __SI_RT: This is not generated by the kernel as of now. */
191 }
192 return err;
193 }
194 }
195
196 int
197 copy_siginfo_from_user (siginfo_t *to, siginfo_t *from)
198 {
199 if (!access_ok(VERIFY_READ, from, sizeof(siginfo_t)))
200 return -EFAULT;
201 if (__copy_from_user(to, from, sizeof(siginfo_t)) != 0)
202 return -EFAULT;
203
204 if (SI_FROMUSER(to))
205 return 0;
206
207 to->si_code &= ~__SI_MASK;
208 if (to->si_code != 0) {
209 switch (to->si_signo) {
210 case SIGILL: case SIGFPE: case SIGSEGV: case SIGBUS: case SIGTRAP:
211 to->si_code |= __SI_FAULT;
212 break;
213
214 case SIGCHLD:
215 to->si_code |= __SI_CHLD;
216 break;
217
218 case SIGPOLL:
219 to->si_code |= __SI_POLL;
220 break;
221
222 case SIGPROF:
223 to->si_code |= __SI_PROF;
224 break;
225
226 default:
227 break;
228 }
229 }
230 return 0;
231 }
232
233 long
234 ia64_rt_sigreturn (struct sigscratch *scr)
235 {
236 extern char ia64_strace_leave_kernel, ia64_leave_kernel;
237 struct sigcontext *sc;
238 struct siginfo si;
239 sigset_t set;
240 long retval;
241
242 sc = &((struct sigframe *) (scr->pt.r12 + 16))->sc;
243
244 /*
245 * When we return to the previously executing context, r8 and r10 have already
246 * been setup the way we want them. Indeed, if the signal wasn't delivered while
247 * in a system call, we must not touch r8 or r10 as otherwise user-level state
248 * could be corrupted.
249 */
250 retval = (long) &ia64_leave_kernel;
251 if (current->ptrace & PT_TRACESYS)
252 /*
253 * strace expects to be notified after sigreturn returns even though the
254 * context to which we return may not be in the middle of a syscall.
255 * Thus, the return-value that strace displays for sigreturn is
256 * meaningless.
257 */
258 retval = (long) &ia64_strace_leave_kernel;
259
260 if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
261 goto give_sigsegv;
262
263 if (GET_SIGSET(&set, &sc->sc_mask))
264 goto give_sigsegv;
265
266 sigdelsetmask(&set, ~_BLOCKABLE);
267
268 spin_lock_irq(¤t->sigmask_lock);
269 {
270 current->blocked = set;
271 recalc_sigpending(current);
272 }
273 spin_unlock_irq(¤t->sigmask_lock);
274
275 if (restore_sigcontext(sc, scr))
276 goto give_sigsegv;
277
278 #if DEBUG_SIG
279 printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
280 current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
281 #endif
282 /*
283 * It is more difficult to avoid calling this function than to
284 * call it and ignore errors.
285 */
286 do_sigaltstack(&sc->sc_stack, 0, scr->pt.r12);
287 return retval;
288
289 give_sigsegv:
290 si.si_signo = SIGSEGV;
291 si.si_errno = 0;
292 si.si_code = SI_KERNEL;
293 si.si_pid = current->pid;
294 si.si_uid = current->uid;
295 si.si_addr = sc;
296 force_sig_info(SIGSEGV, &si, current);
297 return retval;
298 }
299
300 /*
301 * This does just the minimum required setup of sigcontext.
302 * Specifically, it only installs data that is either not knowable at
303 * the user-level or that gets modified before execution in the
304 * trampoline starts. Everything else is done at the user-level.
305 */
306 static long
307 setup_sigcontext (struct sigcontext *sc, sigset_t *mask, struct sigscratch *scr)
308 {
309 unsigned long flags = 0, ifs, nat;
310 long err;
311
312 ifs = scr->pt.cr_ifs;
313
314 if (on_sig_stack((unsigned long) sc))
315 flags |= IA64_SC_FLAG_ONSTACK;
316 if ((ifs & (1UL << 63)) == 0) {
317 /* if cr_ifs isn't valid, we got here through a syscall */
318 flags |= IA64_SC_FLAG_IN_SYSCALL;
319 }
320 ia64_flush_fph(current);
321 if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
322 flags |= IA64_SC_FLAG_FPH_VALID;
323 __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
324 }
325
326 /*
327 * Note: sw->ar_unat is UNDEFINED unless the process is being
328 * PTRACED. However, this is OK because the NaT bits of the
329 * preserved registers (r4-r7) are never being looked at by
330 * the signal handler (registers r4-r7 are used instead).
331 */
332 nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
333
334 err = __put_user(flags, &sc->sc_flags);
335
336 err |= __put_user(nat, &sc->sc_nat);
337 err |= PUT_SIGSET(mask, &sc->sc_mask);
338 err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
339 err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
340 err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
341 err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat); /* ar.unat */
342 err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr); /* ar.fpsr */
343 err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
344 err |= __put_user(scr->pt.pr, &sc->sc_pr); /* predicates */
345 err |= __put_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
346 err |= __put_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
347 err |= __put_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
348
349 err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 3*8); /* r1-r3 */
350 err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8); /* r8-r11 */
351 err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 4*8); /* r12-r15 */
352 err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8); /* r16-r31 */
353
354 err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
355 return err;
356 }
357
358 static long
359 setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
360 struct sigscratch *scr)
361 {
362 extern char ia64_sigtramp[], __start_gate_section[];
363 unsigned long tramp_addr, new_rbs = 0;
364 struct sigframe *frame;
365 struct siginfo si;
366 long err;
367
368 frame = (void *) scr->pt.r12;
369 tramp_addr = GATE_ADDR + (ia64_sigtramp - __start_gate_section);
370 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && !on_sig_stack((unsigned long) frame)) {
371 new_rbs = (current->sas_ss_sp + sizeof(long) - 1) & ~(sizeof(long) - 1);
372 frame = (void *) ((current->sas_ss_sp + current->sas_ss_size)
373 & ~(STACK_ALIGN - 1));
374 }
375 frame = (void *) frame - ((sizeof(*frame) + STACK_ALIGN - 1) & ~(STACK_ALIGN - 1));
376
377 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
378 goto give_sigsegv;
379
380 err = __put_user(sig, &frame->arg0);
381 err |= __put_user(&frame->info, &frame->arg1);
382 err |= __put_user(&frame->sc, &frame->arg2);
383 err |= __put_user(new_rbs, &frame->rbs_base);
384 err |= __put_user(ka->sa.sa_handler, &frame->handler);
385
386 err |= copy_siginfo_to_user(&frame->info, info);
387
388 err |= __put_user(current->sas_ss_sp, &frame->sc.sc_stack.ss_sp);
389 err |= __put_user(current->sas_ss_size, &frame->sc.sc_stack.ss_size);
390 err |= __put_user(sas_ss_flags(scr->pt.r12), &frame->sc.sc_stack.ss_flags);
391 err |= setup_sigcontext(&frame->sc, set, scr);
392
393 if (err)
394 goto give_sigsegv;
395
396 scr->pt.r12 = (unsigned long) frame - 16; /* new stack pointer */
397 scr->pt.ar_fpsr = FPSR_DEFAULT; /* reset fpsr for signal handler */
398 scr->pt.cr_iip = tramp_addr;
399 ia64_psr(&scr->pt)->ri = 0; /* start executing in first slot */
400
401 /*
402 * Note: this affects only the NaT bits of the scratch regs (the ones saved in
403 * pt_regs), which is exactly what we want.
404 */
405 scr->scratch_unat = 0; /* ensure NaT bits of r12 is clear */
406
407 #if DEBUG_SIG
408 printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%lx\n",
409 current->comm, current->pid, sig, scr->pt.r12, scr->pt.cr_iip, scr->pt.r3);
410 #endif
411 return 1;
412
413 give_sigsegv:
414 if (sig == SIGSEGV)
415 ka->sa.sa_handler = SIG_DFL;
416 si.si_signo = SIGSEGV;
417 si.si_errno = 0;
418 si.si_code = SI_KERNEL;
419 si.si_pid = current->pid;
420 si.si_uid = current->uid;
421 si.si_addr = frame;
422 force_sig_info(SIGSEGV, &si, current);
423 return 0;
424 }
425
426 static long
427 handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset,
428 struct sigscratch *scr)
429 {
430 #ifdef CONFIG_IA32_SUPPORT
431 if (IS_IA32_PROCESS(&scr->pt)) {
432 /* send signal to IA-32 process */
433 if (!ia32_setup_frame1(sig, ka, info, oldset, &scr->pt))
434 return 0;
435 } else
436 #endif
437 /* send signal to IA-64 process */
438 if (!setup_frame(sig, ka, info, oldset, scr))
439 return 0;
440
441 if (ka->sa.sa_flags & SA_ONESHOT)
442 ka->sa.sa_handler = SIG_DFL;
443
444 if (!(ka->sa.sa_flags & SA_NODEFER)) {
445 spin_lock_irq(¤t->sigmask_lock);
446 {
447 sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
448 sigaddset(¤t->blocked, sig);
449 recalc_sigpending(current);
450 }
451 spin_unlock_irq(¤t->sigmask_lock);
452 }
453 return 1;
454 }
455
456 /*
457 * Note that `init' is a special process: it doesn't get signals it doesn't want to
458 * handle. Thus you cannot kill init even with a SIGKILL even by mistake.
459 */
460 long
461 ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
462 {
463 struct k_sigaction *ka;
464 siginfo_t info;
465 long restart = in_syscall;
466 long errno = scr->pt.r8;
467
468 /*
469 * In the ia64_leave_kernel code path, we want the common case to go fast, which
470 * is why we may in certain cases get here from kernel mode. Just return without
471 * doing anything if so.
472 */
473 if (!user_mode(&scr->pt))
474 return 0;
475
476 if (!oldset)
477 oldset = ¤t->blocked;
478
479 #ifdef CONFIG_IA32_SUPPORT
480 if (IS_IA32_PROCESS(&scr->pt)) {
481 if (in_syscall) {
482 if (errno >= 0)
483 restart = 0;
484 else
485 errno = -errno;
486 }
487 } else
488 #endif
489 if (scr->pt.r10 != -1) {
490 /*
491 * A system calls has to be restarted only if one of the error codes
492 * ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned. If r10
493 * isn't -1 then r8 doesn't hold an error code and we don't need to
494 * restart the syscall, so we can clear the "restart" flag here.
495 */
496 restart = 0;
497 }
498
499 for (;;) {
500 unsigned long signr;
501
502 spin_lock_irq(¤t->sigmask_lock);
503 signr = dequeue_signal(¤t->blocked, &info);
504 spin_unlock_irq(¤t->sigmask_lock);
505
506 if (!signr)
507 break;
508
509 if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
510 /* Let the debugger run. */
511 current->exit_code = signr;
512 current->thread.siginfo = &info;
513 current->state = TASK_STOPPED;
514 notify_parent(current, SIGCHLD);
515 schedule();
516
517 signr = current->exit_code;
518 current->thread.siginfo = 0;
519
520 /* We're back. Did the debugger cancel the sig? */
521 if (!signr)
522 continue;
523 current->exit_code = 0;
524
525 /* The debugger continued. Ignore SIGSTOP. */
526 if (signr == SIGSTOP)
527 continue;
528
529 /* Update the siginfo structure. Is this good? */
530 if (signr != info.si_signo) {
531 info.si_signo = signr;
532 info.si_errno = 0;
533 info.si_code = SI_USER;
534 info.si_pid = current->p_pptr->pid;
535 info.si_uid = current->p_pptr->uid;
536 }
537
538 /* If the (new) signal is now blocked, requeue it. */
539 if (sigismember(¤t->blocked, signr)) {
540 send_sig_info(signr, &info, current);
541 continue;
542 }
543 }
544
545 ka = ¤t->sig->action[signr - 1];
546 if (ka->sa.sa_handler == SIG_IGN) {
547 if (signr != SIGCHLD)
548 continue;
549 /* Check for SIGCHLD: it's special. */
550 while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
551 /* nothing */;
552 continue;
553 }
554
555 if (ka->sa.sa_handler == SIG_DFL) {
556 int exit_code = signr;
557
558 /* Init gets no signals it doesn't want. */
559 if (current->pid == 1)
560 continue;
561
562 switch (signr) {
563 case SIGCONT: case SIGCHLD: case SIGWINCH:
564 continue;
565
566 case SIGTSTP: case SIGTTIN: case SIGTTOU:
567 if (is_orphaned_pgrp(current->pgrp))
568 continue;
569 /* FALLTHRU */
570
571 case SIGSTOP:
572 current->state = TASK_STOPPED;
573 current->exit_code = signr;
574 if (!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags
575 & SA_NOCLDSTOP))
576 notify_parent(current, SIGCHLD);
577 schedule();
578 continue;
579
580 case SIGQUIT: case SIGILL: case SIGTRAP:
581 case SIGABRT: case SIGFPE: case SIGSEGV:
582 case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
583 if (do_coredump(signr, &scr->pt))
584 exit_code |= 0x80;
585 /* FALLTHRU */
586
587 default:
588 sigaddset(¤t->pending.signal, signr);
589 recalc_sigpending(current);
590 current->flags |= PF_SIGNALED;
591 do_exit(exit_code);
592 /* NOTREACHED */
593 }
594 }
595
596 if (restart) {
597 switch (errno) {
598 case ERESTARTSYS:
599 if ((ka->sa.sa_flags & SA_RESTART) == 0) {
600 case ERESTARTNOHAND:
601 #ifdef CONFIG_IA32_SUPPORT
602 if (IS_IA32_PROCESS(&scr->pt))
603 scr->pt.r8 = -EINTR;
604 else
605 #endif
606 scr->pt.r8 = EINTR;
607 /* note: scr->pt.r10 is already -1 */
608 break;
609 }
610 case ERESTARTNOINTR:
611 #ifdef CONFIG_IA32_SUPPORT
612 if (IS_IA32_PROCESS(&scr->pt)) {
613 scr->pt.r8 = scr->pt.r1;
614 scr->pt.cr_iip -= 2;
615 } else
616 #endif
617 ia64_decrement_ip(&scr->pt);
618 }
619 }
620
621 /* Whee! Actually deliver the signal. If the
622 delivery failed, we need to continue to iterate in
623 this loop so we can deliver the SIGSEGV... */
624 if (handle_signal(signr, ka, &info, oldset, scr))
625 return 1;
626 }
627
628 /* Did we come from a system call? */
629 if (restart) {
630 /* Restart the system call - no handlers present */
631 if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR) {
632 #ifdef CONFIG_IA32_SUPPORT
633 if (IS_IA32_PROCESS(&scr->pt)) {
634 scr->pt.r8 = scr->pt.r1;
635 scr->pt.cr_iip -= 2;
636 } else
637 #endif
638 /*
639 * Note: the syscall number is in r15 which is
640 * saved in pt_regs so all we need to do here
641 * is adjust ip so that the "break"
642 * instruction gets re-executed.
643 */
644 ia64_decrement_ip(&scr->pt);
645 }
646 }
647 return 0;
648 }
649