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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/i386/kernel/signal.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/i386/kernel/signal.c')
-rw-r--r--arch/i386/kernel/signal.c665
1 files changed, 665 insertions, 0 deletions
diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
new file mode 100644
index 000000000000..ef3602e1c052
--- /dev/null
+++ b/arch/i386/kernel/signal.c
@@ -0,0 +1,665 @@
1/*
2 * linux/arch/i386/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 * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
8 */
9
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/smp.h>
13#include <linux/smp_lock.h>
14#include <linux/kernel.h>
15#include <linux/signal.h>
16#include <linux/errno.h>
17#include <linux/wait.h>
18#include <linux/unistd.h>
19#include <linux/stddef.h>
20#include <linux/personality.h>
21#include <linux/suspend.h>
22#include <linux/ptrace.h>
23#include <linux/elf.h>
24#include <asm/processor.h>
25#include <asm/ucontext.h>
26#include <asm/uaccess.h>
27#include <asm/i387.h>
28#include "sigframe.h"
29
30#define DEBUG_SIG 0
31
32#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
33
34/*
35 * Atomically swap in the new signal mask, and wait for a signal.
36 */
37asmlinkage int
38sys_sigsuspend(int history0, int history1, old_sigset_t mask)
39{
40 struct pt_regs * regs = (struct pt_regs *) &history0;
41 sigset_t saveset;
42
43 mask &= _BLOCKABLE;
44 spin_lock_irq(&current->sighand->siglock);
45 saveset = current->blocked;
46 siginitset(&current->blocked, mask);
47 recalc_sigpending();
48 spin_unlock_irq(&current->sighand->siglock);
49
50 regs->eax = -EINTR;
51 while (1) {
52 current->state = TASK_INTERRUPTIBLE;
53 schedule();
54 if (do_signal(regs, &saveset))
55 return -EINTR;
56 }
57}
58
59asmlinkage int
60sys_rt_sigsuspend(struct pt_regs regs)
61{
62 sigset_t saveset, newset;
63
64 /* XXX: Don't preclude handling different sized sigset_t's. */
65 if (regs.ecx != sizeof(sigset_t))
66 return -EINVAL;
67
68 if (copy_from_user(&newset, (sigset_t __user *)regs.ebx, sizeof(newset)))
69 return -EFAULT;
70 sigdelsetmask(&newset, ~_BLOCKABLE);
71
72 spin_lock_irq(&current->sighand->siglock);
73 saveset = current->blocked;
74 current->blocked = newset;
75 recalc_sigpending();
76 spin_unlock_irq(&current->sighand->siglock);
77
78 regs.eax = -EINTR;
79 while (1) {
80 current->state = TASK_INTERRUPTIBLE;
81 schedule();
82 if (do_signal(&regs, &saveset))
83 return -EINTR;
84 }
85}
86
87asmlinkage int
88sys_sigaction(int sig, const struct old_sigaction __user *act,
89 struct old_sigaction __user *oact)
90{
91 struct k_sigaction new_ka, old_ka;
92 int ret;
93
94 if (act) {
95 old_sigset_t mask;
96 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
97 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
98 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
99 return -EFAULT;
100 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
101 __get_user(mask, &act->sa_mask);
102 siginitset(&new_ka.sa.sa_mask, mask);
103 }
104
105 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
106
107 if (!ret && oact) {
108 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
109 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
110 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
111 return -EFAULT;
112 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
113 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
114 }
115
116 return ret;
117}
118
119asmlinkage int
120sys_sigaltstack(unsigned long ebx)
121{
122 /* This is needed to make gcc realize it doesn't own the "struct pt_regs" */
123 struct pt_regs *regs = (struct pt_regs *)&ebx;
124 const stack_t __user *uss = (const stack_t __user *)ebx;
125 stack_t __user *uoss = (stack_t __user *)regs->ecx;
126
127 return do_sigaltstack(uss, uoss, regs->esp);
128}
129
130
131/*
132 * Do a signal return; undo the signal stack.
133 */
134
135static int
136restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax)
137{
138 unsigned int err = 0;
139
140 /* Always make any pending restarted system calls return -EINTR */
141 current_thread_info()->restart_block.fn = do_no_restart_syscall;
142
143#define COPY(x) err |= __get_user(regs->x, &sc->x)
144
145#define COPY_SEG(seg) \
146 { unsigned short tmp; \
147 err |= __get_user(tmp, &sc->seg); \
148 regs->x##seg = tmp; }
149
150#define COPY_SEG_STRICT(seg) \
151 { unsigned short tmp; \
152 err |= __get_user(tmp, &sc->seg); \
153 regs->x##seg = tmp|3; }
154
155#define GET_SEG(seg) \
156 { unsigned short tmp; \
157 err |= __get_user(tmp, &sc->seg); \
158 loadsegment(seg,tmp); }
159
160#define FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | X86_EFLAGS_DF | \
161 X86_EFLAGS_TF | X86_EFLAGS_SF | X86_EFLAGS_ZF | \
162 X86_EFLAGS_AF | X86_EFLAGS_PF | X86_EFLAGS_CF)
163
164 GET_SEG(gs);
165 GET_SEG(fs);
166 COPY_SEG(es);
167 COPY_SEG(ds);
168 COPY(edi);
169 COPY(esi);
170 COPY(ebp);
171 COPY(esp);
172 COPY(ebx);
173 COPY(edx);
174 COPY(ecx);
175 COPY(eip);
176 COPY_SEG_STRICT(cs);
177 COPY_SEG_STRICT(ss);
178
179 {
180 unsigned int tmpflags;
181 err |= __get_user(tmpflags, &sc->eflags);
182 regs->eflags = (regs->eflags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
183 regs->orig_eax = -1; /* disable syscall checks */
184 }
185
186 {
187 struct _fpstate __user * buf;
188 err |= __get_user(buf, &sc->fpstate);
189 if (buf) {
190 if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
191 goto badframe;
192 err |= restore_i387(buf);
193 } else {
194 struct task_struct *me = current;
195 if (used_math()) {
196 clear_fpu(me);
197 clear_used_math();
198 }
199 }
200 }
201
202 err |= __get_user(*peax, &sc->eax);
203 return err;
204
205badframe:
206 return 1;
207}
208
209asmlinkage int sys_sigreturn(unsigned long __unused)
210{
211 struct pt_regs *regs = (struct pt_regs *) &__unused;
212 struct sigframe __user *frame = (struct sigframe __user *)(regs->esp - 8);
213 sigset_t set;
214 int eax;
215
216 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
217 goto badframe;
218 if (__get_user(set.sig[0], &frame->sc.oldmask)
219 || (_NSIG_WORDS > 1
220 && __copy_from_user(&set.sig[1], &frame->extramask,
221 sizeof(frame->extramask))))
222 goto badframe;
223
224 sigdelsetmask(&set, ~_BLOCKABLE);
225 spin_lock_irq(&current->sighand->siglock);
226 current->blocked = set;
227 recalc_sigpending();
228 spin_unlock_irq(&current->sighand->siglock);
229
230 if (restore_sigcontext(regs, &frame->sc, &eax))
231 goto badframe;
232 return eax;
233
234badframe:
235 force_sig(SIGSEGV, current);
236 return 0;
237}
238
239asmlinkage int sys_rt_sigreturn(unsigned long __unused)
240{
241 struct pt_regs *regs = (struct pt_regs *) &__unused;
242 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs->esp - 4);
243 sigset_t set;
244 int eax;
245
246 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
247 goto badframe;
248 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
249 goto badframe;
250
251 sigdelsetmask(&set, ~_BLOCKABLE);
252 spin_lock_irq(&current->sighand->siglock);
253 current->blocked = set;
254 recalc_sigpending();
255 spin_unlock_irq(&current->sighand->siglock);
256
257 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
258 goto badframe;
259
260 if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->esp) == -EFAULT)
261 goto badframe;
262
263 return eax;
264
265badframe:
266 force_sig(SIGSEGV, current);
267 return 0;
268}
269
270/*
271 * Set up a signal frame.
272 */
273
274static int
275setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
276 struct pt_regs *regs, unsigned long mask)
277{
278 int tmp, err = 0;
279
280 tmp = 0;
281 __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
282 err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
283 __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
284 err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
285
286 err |= __put_user(regs->xes, (unsigned int __user *)&sc->es);
287 err |= __put_user(regs->xds, (unsigned int __user *)&sc->ds);
288 err |= __put_user(regs->edi, &sc->edi);
289 err |= __put_user(regs->esi, &sc->esi);
290 err |= __put_user(regs->ebp, &sc->ebp);
291 err |= __put_user(regs->esp, &sc->esp);
292 err |= __put_user(regs->ebx, &sc->ebx);
293 err |= __put_user(regs->edx, &sc->edx);
294 err |= __put_user(regs->ecx, &sc->ecx);
295 err |= __put_user(regs->eax, &sc->eax);
296 err |= __put_user(current->thread.trap_no, &sc->trapno);
297 err |= __put_user(current->thread.error_code, &sc->err);
298 err |= __put_user(regs->eip, &sc->eip);
299 err |= __put_user(regs->xcs, (unsigned int __user *)&sc->cs);
300 err |= __put_user(regs->eflags, &sc->eflags);
301 err |= __put_user(regs->esp, &sc->esp_at_signal);
302 err |= __put_user(regs->xss, (unsigned int __user *)&sc->ss);
303
304 tmp = save_i387(fpstate);
305 if (tmp < 0)
306 err = 1;
307 else
308 err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
309
310 /* non-iBCS2 extensions.. */
311 err |= __put_user(mask, &sc->oldmask);
312 err |= __put_user(current->thread.cr2, &sc->cr2);
313
314 return err;
315}
316
317/*
318 * Determine which stack to use..
319 */
320static inline void __user *
321get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
322{
323 unsigned long esp;
324
325 /* Default to using normal stack */
326 esp = regs->esp;
327
328 /* This is the X/Open sanctioned signal stack switching. */
329 if (ka->sa.sa_flags & SA_ONSTACK) {
330 if (sas_ss_flags(esp) == 0)
331 esp = current->sas_ss_sp + current->sas_ss_size;
332 }
333
334 /* This is the legacy signal stack switching. */
335 else if ((regs->xss & 0xffff) != __USER_DS &&
336 !(ka->sa.sa_flags & SA_RESTORER) &&
337 ka->sa.sa_restorer) {
338 esp = (unsigned long) ka->sa.sa_restorer;
339 }
340
341 return (void __user *)((esp - frame_size) & -8ul);
342}
343
344/* These symbols are defined with the addresses in the vsyscall page.
345 See vsyscall-sigreturn.S. */
346extern void __user __kernel_sigreturn;
347extern void __user __kernel_rt_sigreturn;
348
349static void setup_frame(int sig, struct k_sigaction *ka,
350 sigset_t *set, struct pt_regs * regs)
351{
352 void __user *restorer;
353 struct sigframe __user *frame;
354 int err = 0;
355 int usig;
356
357 frame = get_sigframe(ka, regs, sizeof(*frame));
358
359 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
360 goto give_sigsegv;
361
362 usig = current_thread_info()->exec_domain
363 && current_thread_info()->exec_domain->signal_invmap
364 && sig < 32
365 ? current_thread_info()->exec_domain->signal_invmap[sig]
366 : sig;
367
368 err = __put_user(usig, &frame->sig);
369 if (err)
370 goto give_sigsegv;
371
372 err = setup_sigcontext(&frame->sc, &frame->fpstate, regs, set->sig[0]);
373 if (err)
374 goto give_sigsegv;
375
376 if (_NSIG_WORDS > 1) {
377 err = __copy_to_user(&frame->extramask, &set->sig[1],
378 sizeof(frame->extramask));
379 if (err)
380 goto give_sigsegv;
381 }
382
383 restorer = &__kernel_sigreturn;
384 if (ka->sa.sa_flags & SA_RESTORER)
385 restorer = ka->sa.sa_restorer;
386
387 /* Set up to return from userspace. */
388 err |= __put_user(restorer, &frame->pretcode);
389
390 /*
391 * This is popl %eax ; movl $,%eax ; int $0x80
392 *
393 * WE DO NOT USE IT ANY MORE! It's only left here for historical
394 * reasons and because gdb uses it as a signature to notice
395 * signal handler stack frames.
396 */
397 err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
398 err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
399 err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
400
401 if (err)
402 goto give_sigsegv;
403
404 /* Set up registers for signal handler */
405 regs->esp = (unsigned long) frame;
406 regs->eip = (unsigned long) ka->sa.sa_handler;
407 regs->eax = (unsigned long) sig;
408 regs->edx = (unsigned long) 0;
409 regs->ecx = (unsigned long) 0;
410
411 set_fs(USER_DS);
412 regs->xds = __USER_DS;
413 regs->xes = __USER_DS;
414 regs->xss = __USER_DS;
415 regs->xcs = __USER_CS;
416
417 /*
418 * Clear TF when entering the signal handler, but
419 * notify any tracer that was single-stepping it.
420 * The tracer may want to single-step inside the
421 * handler too.
422 */
423 regs->eflags &= ~TF_MASK;
424 if (test_thread_flag(TIF_SINGLESTEP))
425 ptrace_notify(SIGTRAP);
426
427#if DEBUG_SIG
428 printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
429 current->comm, current->pid, frame, regs->eip, frame->pretcode);
430#endif
431
432 return;
433
434give_sigsegv:
435 force_sigsegv(sig, current);
436}
437
438static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
439 sigset_t *set, struct pt_regs * regs)
440{
441 void __user *restorer;
442 struct rt_sigframe __user *frame;
443 int err = 0;
444 int usig;
445
446 frame = get_sigframe(ka, regs, sizeof(*frame));
447
448 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
449 goto give_sigsegv;
450
451 usig = current_thread_info()->exec_domain
452 && current_thread_info()->exec_domain->signal_invmap
453 && sig < 32
454 ? current_thread_info()->exec_domain->signal_invmap[sig]
455 : sig;
456
457 err |= __put_user(usig, &frame->sig);
458 err |= __put_user(&frame->info, &frame->pinfo);
459 err |= __put_user(&frame->uc, &frame->puc);
460 err |= copy_siginfo_to_user(&frame->info, info);
461 if (err)
462 goto give_sigsegv;
463
464 /* Create the ucontext. */
465 err |= __put_user(0, &frame->uc.uc_flags);
466 err |= __put_user(0, &frame->uc.uc_link);
467 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
468 err |= __put_user(sas_ss_flags(regs->esp),
469 &frame->uc.uc_stack.ss_flags);
470 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
471 err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
472 regs, set->sig[0]);
473 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
474 if (err)
475 goto give_sigsegv;
476
477 /* Set up to return from userspace. */
478 restorer = &__kernel_rt_sigreturn;
479 if (ka->sa.sa_flags & SA_RESTORER)
480 restorer = ka->sa.sa_restorer;
481 err |= __put_user(restorer, &frame->pretcode);
482
483 /*
484 * This is movl $,%eax ; int $0x80
485 *
486 * WE DO NOT USE IT ANY MORE! It's only left here for historical
487 * reasons and because gdb uses it as a signature to notice
488 * signal handler stack frames.
489 */
490 err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
491 err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
492 err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
493
494 if (err)
495 goto give_sigsegv;
496
497 /* Set up registers for signal handler */
498 regs->esp = (unsigned long) frame;
499 regs->eip = (unsigned long) ka->sa.sa_handler;
500 regs->eax = (unsigned long) usig;
501 regs->edx = (unsigned long) &frame->info;
502 regs->ecx = (unsigned long) &frame->uc;
503
504 set_fs(USER_DS);
505 regs->xds = __USER_DS;
506 regs->xes = __USER_DS;
507 regs->xss = __USER_DS;
508 regs->xcs = __USER_CS;
509
510 /*
511 * Clear TF when entering the signal handler, but
512 * notify any tracer that was single-stepping it.
513 * The tracer may want to single-step inside the
514 * handler too.
515 */
516 regs->eflags &= ~TF_MASK;
517 if (test_thread_flag(TIF_SINGLESTEP))
518 ptrace_notify(SIGTRAP);
519
520#if DEBUG_SIG
521 printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
522 current->comm, current->pid, frame, regs->eip, frame->pretcode);
523#endif
524
525 return;
526
527give_sigsegv:
528 force_sigsegv(sig, current);
529}
530
531/*
532 * OK, we're invoking a handler
533 */
534
535static void
536handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
537 sigset_t *oldset, struct pt_regs * regs)
538{
539 /* Are we from a system call? */
540 if (regs->orig_eax >= 0) {
541 /* If so, check system call restarting.. */
542 switch (regs->eax) {
543 case -ERESTART_RESTARTBLOCK:
544 case -ERESTARTNOHAND:
545 regs->eax = -EINTR;
546 break;
547
548 case -ERESTARTSYS:
549 if (!(ka->sa.sa_flags & SA_RESTART)) {
550 regs->eax = -EINTR;
551 break;
552 }
553 /* fallthrough */
554 case -ERESTARTNOINTR:
555 regs->eax = regs->orig_eax;
556 regs->eip -= 2;
557 }
558 }
559
560 /*
561 * If TF is set due to a debugger (PT_DTRACE), clear the TF flag so
562 * that register information in the sigcontext is correct.
563 */
564 if (unlikely(regs->eflags & TF_MASK)
565 && likely(current->ptrace & PT_DTRACE)) {
566 current->ptrace &= ~PT_DTRACE;
567 regs->eflags &= ~TF_MASK;
568 }
569
570 /* Set up the stack frame */
571 if (ka->sa.sa_flags & SA_SIGINFO)
572 setup_rt_frame(sig, ka, info, oldset, regs);
573 else
574 setup_frame(sig, ka, oldset, regs);
575
576 if (!(ka->sa.sa_flags & SA_NODEFER)) {
577 spin_lock_irq(&current->sighand->siglock);
578 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
579 sigaddset(&current->blocked,sig);
580 recalc_sigpending();
581 spin_unlock_irq(&current->sighand->siglock);
582 }
583}
584
585/*
586 * Note that 'init' is a special process: it doesn't get signals it doesn't
587 * want to handle. Thus you cannot kill init even with a SIGKILL even by
588 * mistake.
589 */
590int fastcall do_signal(struct pt_regs *regs, sigset_t *oldset)
591{
592 siginfo_t info;
593 int signr;
594 struct k_sigaction ka;
595
596 /*
597 * We want the common case to go fast, which
598 * is why we may in certain cases get here from
599 * kernel mode. Just return without doing anything
600 * if so.
601 */
602 if ((regs->xcs & 3) != 3)
603 return 1;
604
605 if (current->flags & PF_FREEZE) {
606 refrigerator(0);
607 goto no_signal;
608 }
609
610 if (!oldset)
611 oldset = &current->blocked;
612
613 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
614 if (signr > 0) {
615 /* Reenable any watchpoints before delivering the
616 * signal to user space. The processor register will
617 * have been cleared if the watchpoint triggered
618 * inside the kernel.
619 */
620 if (unlikely(current->thread.debugreg[7])) {
621 __asm__("movl %0,%%db7" : : "r" (current->thread.debugreg[7]));
622 }
623
624 /* Whee! Actually deliver the signal. */
625 handle_signal(signr, &info, &ka, oldset, regs);
626 return 1;
627 }
628
629 no_signal:
630 /* Did we come from a system call? */
631 if (regs->orig_eax >= 0) {
632 /* Restart the system call - no handlers present */
633 if (regs->eax == -ERESTARTNOHAND ||
634 regs->eax == -ERESTARTSYS ||
635 regs->eax == -ERESTARTNOINTR) {
636 regs->eax = regs->orig_eax;
637 regs->eip -= 2;
638 }
639 if (regs->eax == -ERESTART_RESTARTBLOCK){
640 regs->eax = __NR_restart_syscall;
641 regs->eip -= 2;
642 }
643 }
644 return 0;
645}
646
647/*
648 * notification of userspace execution resumption
649 * - triggered by current->work.notify_resume
650 */
651__attribute__((regparm(3)))
652void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
653 __u32 thread_info_flags)
654{
655 /* Pending single-step? */
656 if (thread_info_flags & _TIF_SINGLESTEP) {
657 regs->eflags |= TF_MASK;
658 clear_thread_flag(TIF_SINGLESTEP);
659 }
660 /* deal with pending signal delivery */
661 if (thread_info_flags & _TIF_SIGPENDING)
662 do_signal(regs,oldset);
663
664 clear_thread_flag(TIF_IRET);
665}