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Diffstat (limited to 'arch/alpha/kernel/signal.c')
-rw-r--r--arch/alpha/kernel/signal.c672
1 files changed, 672 insertions, 0 deletions
diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
new file mode 100644
index 000000000000..08fe8071a7f8
--- /dev/null
+++ b/arch/alpha/kernel/signal.c
@@ -0,0 +1,672 @@
1/*
2 * linux/arch/alpha/kernel/signal.c
3 *
4 * Copyright (C) 1995 Linus Torvalds
5 *
6 * 1997-11-02 Modified for POSIX.1b signals by Richard Henderson
7 */
8
9#include <linux/sched.h>
10#include <linux/kernel.h>
11#include <linux/signal.h>
12#include <linux/errno.h>
13#include <linux/wait.h>
14#include <linux/ptrace.h>
15#include <linux/unistd.h>
16#include <linux/mm.h>
17#include <linux/smp.h>
18#include <linux/smp_lock.h>
19#include <linux/stddef.h>
20#include <linux/tty.h>
21#include <linux/binfmts.h>
22#include <linux/bitops.h>
23
24#include <asm/uaccess.h>
25#include <asm/sigcontext.h>
26#include <asm/ucontext.h>
27
28#include "proto.h"
29
30
31#define DEBUG_SIG 0
32
33#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
34
35asmlinkage void ret_from_sys_call(void);
36static int do_signal(sigset_t *, struct pt_regs *, struct switch_stack *,
37 unsigned long, unsigned long);
38
39
40/*
41 * The OSF/1 sigprocmask calling sequence is different from the
42 * C sigprocmask() sequence..
43 *
44 * how:
45 * 1 - SIG_BLOCK
46 * 2 - SIG_UNBLOCK
47 * 3 - SIG_SETMASK
48 *
49 * We change the range to -1 .. 1 in order to let gcc easily
50 * use the conditional move instructions.
51 *
52 * Note that we don't need to acquire the kernel lock for SMP
53 * operation, as all of this is local to this thread.
54 */
55asmlinkage unsigned long
56do_osf_sigprocmask(int how, unsigned long newmask, struct pt_regs *regs)
57{
58 unsigned long oldmask = -EINVAL;
59
60 if ((unsigned long)how-1 <= 2) {
61 long sign = how-2; /* -1 .. 1 */
62 unsigned long block, unblock;
63
64 newmask &= _BLOCKABLE;
65 spin_lock_irq(&current->sighand->siglock);
66 oldmask = current->blocked.sig[0];
67
68 unblock = oldmask & ~newmask;
69 block = oldmask | newmask;
70 if (!sign)
71 block = unblock;
72 if (sign <= 0)
73 newmask = block;
74 if (_NSIG_WORDS > 1 && sign > 0)
75 sigemptyset(&current->blocked);
76 current->blocked.sig[0] = newmask;
77 recalc_sigpending();
78 spin_unlock_irq(&current->sighand->siglock);
79
80 regs->r0 = 0; /* special no error return */
81 }
82 return oldmask;
83}
84
85asmlinkage int
86osf_sigaction(int sig, const struct osf_sigaction __user *act,
87 struct osf_sigaction __user *oact)
88{
89 struct k_sigaction new_ka, old_ka;
90 int ret;
91
92 if (act) {
93 old_sigset_t mask;
94 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
95 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
96 __get_user(new_ka.sa.sa_flags, &act->sa_flags))
97 return -EFAULT;
98 __get_user(mask, &act->sa_mask);
99 siginitset(&new_ka.sa.sa_mask, mask);
100 new_ka.ka_restorer = NULL;
101 }
102
103 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
104
105 if (!ret && oact) {
106 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
107 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
108 __put_user(old_ka.sa.sa_flags, &oact->sa_flags))
109 return -EFAULT;
110 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
111 }
112
113 return ret;
114}
115
116asmlinkage long
117sys_rt_sigaction(int sig, const struct sigaction __user *act,
118 struct sigaction __user *oact,
119 size_t sigsetsize, void __user *restorer)
120{
121 struct k_sigaction new_ka, old_ka;
122 int ret;
123
124 /* XXX: Don't preclude handling different sized sigset_t's. */
125 if (sigsetsize != sizeof(sigset_t))
126 return -EINVAL;
127
128 if (act) {
129 new_ka.ka_restorer = restorer;
130 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
131 return -EFAULT;
132 }
133
134 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
135
136 if (!ret && oact) {
137 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
138 return -EFAULT;
139 }
140
141 return ret;
142}
143
144/*
145 * Atomically swap in the new signal mask, and wait for a signal.
146 */
147asmlinkage int
148do_sigsuspend(old_sigset_t mask, struct pt_regs *regs, struct switch_stack *sw)
149{
150 sigset_t oldset;
151
152 mask &= _BLOCKABLE;
153 spin_lock_irq(&current->sighand->siglock);
154 oldset = current->blocked;
155 siginitset(&current->blocked, mask);
156 recalc_sigpending();
157 spin_unlock_irq(&current->sighand->siglock);
158
159 /* Indicate EINTR on return from any possible signal handler,
160 which will not come back through here, but via sigreturn. */
161 regs->r0 = EINTR;
162 regs->r19 = 1;
163
164 while (1) {
165 current->state = TASK_INTERRUPTIBLE;
166 schedule();
167 if (do_signal(&oldset, regs, sw, 0, 0))
168 return -EINTR;
169 }
170}
171
172asmlinkage int
173do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
174 struct pt_regs *regs, struct switch_stack *sw)
175{
176 sigset_t oldset, set;
177
178 /* XXX: Don't preclude handling different sized sigset_t's. */
179 if (sigsetsize != sizeof(sigset_t))
180 return -EINVAL;
181 if (copy_from_user(&set, uset, sizeof(set)))
182 return -EFAULT;
183
184 sigdelsetmask(&set, ~_BLOCKABLE);
185 spin_lock_irq(&current->sighand->siglock);
186 oldset = current->blocked;
187 current->blocked = set;
188 recalc_sigpending();
189 spin_unlock_irq(&current->sighand->siglock);
190
191 /* Indicate EINTR on return from any possible signal handler,
192 which will not come back through here, but via sigreturn. */
193 regs->r0 = EINTR;
194 regs->r19 = 1;
195
196 while (1) {
197 current->state = TASK_INTERRUPTIBLE;
198 schedule();
199 if (do_signal(&oldset, regs, sw, 0, 0))
200 return -EINTR;
201 }
202}
203
204asmlinkage int
205sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
206{
207 return do_sigaltstack(uss, uoss, rdusp());
208}
209
210/*
211 * Do a signal return; undo the signal stack.
212 */
213
214#if _NSIG_WORDS > 1
215# error "Non SA_SIGINFO frame needs rearranging"
216#endif
217
218struct sigframe
219{
220 struct sigcontext sc;
221 unsigned int retcode[3];
222};
223
224struct rt_sigframe
225{
226 struct siginfo info;
227 struct ucontext uc;
228 unsigned int retcode[3];
229};
230
231/* If this changes, userland unwinders that Know Things about our signal
232 frame will break. Do not undertake lightly. It also implies an ABI
233 change wrt the size of siginfo_t, which may cause some pain. */
234extern char compile_time_assert
235 [offsetof(struct rt_sigframe, uc.uc_mcontext) == 176 ? 1 : -1];
236
237#define INSN_MOV_R30_R16 0x47fe0410
238#define INSN_LDI_R0 0x201f0000
239#define INSN_CALLSYS 0x00000083
240
241static long
242restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
243 struct switch_stack *sw)
244{
245 unsigned long usp;
246 long i, err = __get_user(regs->pc, &sc->sc_pc);
247
248 sw->r26 = (unsigned long) ret_from_sys_call;
249
250 err |= __get_user(regs->r0, sc->sc_regs+0);
251 err |= __get_user(regs->r1, sc->sc_regs+1);
252 err |= __get_user(regs->r2, sc->sc_regs+2);
253 err |= __get_user(regs->r3, sc->sc_regs+3);
254 err |= __get_user(regs->r4, sc->sc_regs+4);
255 err |= __get_user(regs->r5, sc->sc_regs+5);
256 err |= __get_user(regs->r6, sc->sc_regs+6);
257 err |= __get_user(regs->r7, sc->sc_regs+7);
258 err |= __get_user(regs->r8, sc->sc_regs+8);
259 err |= __get_user(sw->r9, sc->sc_regs+9);
260 err |= __get_user(sw->r10, sc->sc_regs+10);
261 err |= __get_user(sw->r11, sc->sc_regs+11);
262 err |= __get_user(sw->r12, sc->sc_regs+12);
263 err |= __get_user(sw->r13, sc->sc_regs+13);
264 err |= __get_user(sw->r14, sc->sc_regs+14);
265 err |= __get_user(sw->r15, sc->sc_regs+15);
266 err |= __get_user(regs->r16, sc->sc_regs+16);
267 err |= __get_user(regs->r17, sc->sc_regs+17);
268 err |= __get_user(regs->r18, sc->sc_regs+18);
269 err |= __get_user(regs->r19, sc->sc_regs+19);
270 err |= __get_user(regs->r20, sc->sc_regs+20);
271 err |= __get_user(regs->r21, sc->sc_regs+21);
272 err |= __get_user(regs->r22, sc->sc_regs+22);
273 err |= __get_user(regs->r23, sc->sc_regs+23);
274 err |= __get_user(regs->r24, sc->sc_regs+24);
275 err |= __get_user(regs->r25, sc->sc_regs+25);
276 err |= __get_user(regs->r26, sc->sc_regs+26);
277 err |= __get_user(regs->r27, sc->sc_regs+27);
278 err |= __get_user(regs->r28, sc->sc_regs+28);
279 err |= __get_user(regs->gp, sc->sc_regs+29);
280 err |= __get_user(usp, sc->sc_regs+30);
281 wrusp(usp);
282
283 for (i = 0; i < 31; i++)
284 err |= __get_user(sw->fp[i], sc->sc_fpregs+i);
285 err |= __get_user(sw->fp[31], &sc->sc_fpcr);
286
287 return err;
288}
289
290/* Note that this syscall is also used by setcontext(3) to install
291 a given sigcontext. This because it's impossible to set *all*
292 registers and transfer control from userland. */
293
294asmlinkage void
295do_sigreturn(struct sigcontext __user *sc, struct pt_regs *regs,
296 struct switch_stack *sw)
297{
298 sigset_t set;
299
300 /* Verify that it's a good sigcontext before using it */
301 if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
302 goto give_sigsegv;
303 if (__get_user(set.sig[0], &sc->sc_mask))
304 goto give_sigsegv;
305
306 sigdelsetmask(&set, ~_BLOCKABLE);
307 spin_lock_irq(&current->sighand->siglock);
308 current->blocked = set;
309 recalc_sigpending();
310 spin_unlock_irq(&current->sighand->siglock);
311
312 if (restore_sigcontext(sc, regs, sw))
313 goto give_sigsegv;
314
315 /* Send SIGTRAP if we're single-stepping: */
316 if (ptrace_cancel_bpt (current)) {
317 siginfo_t info;
318
319 info.si_signo = SIGTRAP;
320 info.si_errno = 0;
321 info.si_code = TRAP_BRKPT;
322 info.si_addr = (void __user *) regs->pc;
323 info.si_trapno = 0;
324 send_sig_info(SIGTRAP, &info, current);
325 }
326 return;
327
328give_sigsegv:
329 force_sig(SIGSEGV, current);
330}
331
332asmlinkage void
333do_rt_sigreturn(struct rt_sigframe __user *frame, struct pt_regs *regs,
334 struct switch_stack *sw)
335{
336 sigset_t set;
337
338 /* Verify that it's a good ucontext_t before using it */
339 if (!access_ok(VERIFY_READ, &frame->uc, sizeof(frame->uc)))
340 goto give_sigsegv;
341 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
342 goto give_sigsegv;
343
344 sigdelsetmask(&set, ~_BLOCKABLE);
345 spin_lock_irq(&current->sighand->siglock);
346 current->blocked = set;
347 recalc_sigpending();
348 spin_unlock_irq(&current->sighand->siglock);
349
350 if (restore_sigcontext(&frame->uc.uc_mcontext, regs, sw))
351 goto give_sigsegv;
352
353 /* Send SIGTRAP if we're single-stepping: */
354 if (ptrace_cancel_bpt (current)) {
355 siginfo_t info;
356
357 info.si_signo = SIGTRAP;
358 info.si_errno = 0;
359 info.si_code = TRAP_BRKPT;
360 info.si_addr = (void __user *) regs->pc;
361 info.si_trapno = 0;
362 send_sig_info(SIGTRAP, &info, current);
363 }
364 return;
365
366give_sigsegv:
367 force_sig(SIGSEGV, current);
368}
369
370
371/*
372 * Set up a signal frame.
373 */
374
375static inline void __user *
376get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
377{
378 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp))
379 sp = current->sas_ss_sp + current->sas_ss_size;
380
381 return (void __user *)((sp - frame_size) & -32ul);
382}
383
384static long
385setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
386 struct switch_stack *sw, unsigned long mask, unsigned long sp)
387{
388 long i, err = 0;
389
390 err |= __put_user(on_sig_stack((unsigned long)sc), &sc->sc_onstack);
391 err |= __put_user(mask, &sc->sc_mask);
392 err |= __put_user(regs->pc, &sc->sc_pc);
393 err |= __put_user(8, &sc->sc_ps);
394
395 err |= __put_user(regs->r0 , sc->sc_regs+0);
396 err |= __put_user(regs->r1 , sc->sc_regs+1);
397 err |= __put_user(regs->r2 , sc->sc_regs+2);
398 err |= __put_user(regs->r3 , sc->sc_regs+3);
399 err |= __put_user(regs->r4 , sc->sc_regs+4);
400 err |= __put_user(regs->r5 , sc->sc_regs+5);
401 err |= __put_user(regs->r6 , sc->sc_regs+6);
402 err |= __put_user(regs->r7 , sc->sc_regs+7);
403 err |= __put_user(regs->r8 , sc->sc_regs+8);
404 err |= __put_user(sw->r9 , sc->sc_regs+9);
405 err |= __put_user(sw->r10 , sc->sc_regs+10);
406 err |= __put_user(sw->r11 , sc->sc_regs+11);
407 err |= __put_user(sw->r12 , sc->sc_regs+12);
408 err |= __put_user(sw->r13 , sc->sc_regs+13);
409 err |= __put_user(sw->r14 , sc->sc_regs+14);
410 err |= __put_user(sw->r15 , sc->sc_regs+15);
411 err |= __put_user(regs->r16, sc->sc_regs+16);
412 err |= __put_user(regs->r17, sc->sc_regs+17);
413 err |= __put_user(regs->r18, sc->sc_regs+18);
414 err |= __put_user(regs->r19, sc->sc_regs+19);
415 err |= __put_user(regs->r20, sc->sc_regs+20);
416 err |= __put_user(regs->r21, sc->sc_regs+21);
417 err |= __put_user(regs->r22, sc->sc_regs+22);
418 err |= __put_user(regs->r23, sc->sc_regs+23);
419 err |= __put_user(regs->r24, sc->sc_regs+24);
420 err |= __put_user(regs->r25, sc->sc_regs+25);
421 err |= __put_user(regs->r26, sc->sc_regs+26);
422 err |= __put_user(regs->r27, sc->sc_regs+27);
423 err |= __put_user(regs->r28, sc->sc_regs+28);
424 err |= __put_user(regs->gp , sc->sc_regs+29);
425 err |= __put_user(sp, sc->sc_regs+30);
426 err |= __put_user(0, sc->sc_regs+31);
427
428 for (i = 0; i < 31; i++)
429 err |= __put_user(sw->fp[i], sc->sc_fpregs+i);
430 err |= __put_user(0, sc->sc_fpregs+31);
431 err |= __put_user(sw->fp[31], &sc->sc_fpcr);
432
433 err |= __put_user(regs->trap_a0, &sc->sc_traparg_a0);
434 err |= __put_user(regs->trap_a1, &sc->sc_traparg_a1);
435 err |= __put_user(regs->trap_a2, &sc->sc_traparg_a2);
436
437 return err;
438}
439
440static void
441setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
442 struct pt_regs *regs, struct switch_stack * sw)
443{
444 unsigned long oldsp, r26, err = 0;
445 struct sigframe __user *frame;
446
447 oldsp = rdusp();
448 frame = get_sigframe(ka, oldsp, sizeof(*frame));
449 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
450 goto give_sigsegv;
451
452 err |= setup_sigcontext(&frame->sc, regs, sw, set->sig[0], oldsp);
453 if (err)
454 goto give_sigsegv;
455
456 /* Set up to return from userspace. If provided, use a stub
457 already in userspace. */
458 if (ka->ka_restorer) {
459 r26 = (unsigned long) ka->ka_restorer;
460 } else {
461 err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
462 err |= __put_user(INSN_LDI_R0+__NR_sigreturn, frame->retcode+1);
463 err |= __put_user(INSN_CALLSYS, frame->retcode+2);
464 imb();
465 r26 = (unsigned long) frame->retcode;
466 }
467
468 /* Check that everything was written properly. */
469 if (err)
470 goto give_sigsegv;
471
472 /* "Return" to the handler */
473 regs->r26 = r26;
474 regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler;
475 regs->r16 = sig; /* a0: signal number */
476 regs->r17 = 0; /* a1: exception code */
477 regs->r18 = (unsigned long) &frame->sc; /* a2: sigcontext pointer */
478 wrusp((unsigned long) frame);
479
480#if DEBUG_SIG
481 printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
482 current->comm, current->pid, frame, regs->pc, regs->r26);
483#endif
484
485 return;
486
487give_sigsegv:
488 force_sigsegv(sig, current);
489}
490
491static void
492setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
493 sigset_t *set, struct pt_regs *regs, struct switch_stack * sw)
494{
495 unsigned long oldsp, r26, err = 0;
496 struct rt_sigframe __user *frame;
497
498 oldsp = rdusp();
499 frame = get_sigframe(ka, oldsp, sizeof(*frame));
500 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
501 goto give_sigsegv;
502
503 err |= copy_siginfo_to_user(&frame->info, info);
504
505 /* Create the ucontext. */
506 err |= __put_user(0, &frame->uc.uc_flags);
507 err |= __put_user(0, &frame->uc.uc_link);
508 err |= __put_user(set->sig[0], &frame->uc.uc_osf_sigmask);
509 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
510 err |= __put_user(sas_ss_flags(oldsp), &frame->uc.uc_stack.ss_flags);
511 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
512 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, sw,
513 set->sig[0], oldsp);
514 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
515 if (err)
516 goto give_sigsegv;
517
518 /* Set up to return from userspace. If provided, use a stub
519 already in userspace. */
520 if (ka->ka_restorer) {
521 r26 = (unsigned long) ka->ka_restorer;
522 } else {
523 err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
524 err |= __put_user(INSN_LDI_R0+__NR_rt_sigreturn,
525 frame->retcode+1);
526 err |= __put_user(INSN_CALLSYS, frame->retcode+2);
527 imb();
528 r26 = (unsigned long) frame->retcode;
529 }
530
531 if (err)
532 goto give_sigsegv;
533
534 /* "Return" to the handler */
535 regs->r26 = r26;
536 regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler;
537 regs->r16 = sig; /* a0: signal number */
538 regs->r17 = (unsigned long) &frame->info; /* a1: siginfo pointer */
539 regs->r18 = (unsigned long) &frame->uc; /* a2: ucontext pointer */
540 wrusp((unsigned long) frame);
541
542#if DEBUG_SIG
543 printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
544 current->comm, current->pid, frame, regs->pc, regs->r26);
545#endif
546
547 return;
548
549give_sigsegv:
550 force_sigsegv(sig, current);
551}
552
553
554/*
555 * OK, we're invoking a handler.
556 */
557static inline void
558handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
559 sigset_t *oldset, struct pt_regs * regs, struct switch_stack *sw)
560{
561 if (ka->sa.sa_flags & SA_SIGINFO)
562 setup_rt_frame(sig, ka, info, oldset, regs, sw);
563 else
564 setup_frame(sig, ka, oldset, regs, sw);
565
566 if (ka->sa.sa_flags & SA_RESETHAND)
567 ka->sa.sa_handler = SIG_DFL;
568
569 if (!(ka->sa.sa_flags & SA_NODEFER)) {
570 spin_lock_irq(&current->sighand->siglock);
571 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
572 sigaddset(&current->blocked,sig);
573 recalc_sigpending();
574 spin_unlock_irq(&current->sighand->siglock);
575 }
576}
577
578static inline void
579syscall_restart(unsigned long r0, unsigned long r19,
580 struct pt_regs *regs, struct k_sigaction *ka)
581{
582 switch (regs->r0) {
583 case ERESTARTSYS:
584 if (!(ka->sa.sa_flags & SA_RESTART)) {
585 case ERESTARTNOHAND:
586 regs->r0 = EINTR;
587 break;
588 }
589 /* fallthrough */
590 case ERESTARTNOINTR:
591 regs->r0 = r0; /* reset v0 and a3 and replay syscall */
592 regs->r19 = r19;
593 regs->pc -= 4;
594 break;
595 case ERESTART_RESTARTBLOCK:
596 current_thread_info()->restart_block.fn = do_no_restart_syscall;
597 regs->r0 = EINTR;
598 break;
599 }
600}
601
602
603/*
604 * Note that 'init' is a special process: it doesn't get signals it doesn't
605 * want to handle. Thus you cannot kill init even with a SIGKILL even by
606 * mistake.
607 *
608 * Note that we go through the signals twice: once to check the signals that
609 * the kernel can handle, and then we build all the user-level signal handling
610 * stack-frames in one go after that.
611 *
612 * "r0" and "r19" are the registers we need to restore for system call
613 * restart. "r0" is also used as an indicator whether we can restart at
614 * all (if we get here from anything but a syscall return, it will be 0)
615 */
616static int
617do_signal(sigset_t *oldset, struct pt_regs * regs, struct switch_stack * sw,
618 unsigned long r0, unsigned long r19)
619{
620 siginfo_t info;
621 int signr;
622 unsigned long single_stepping = ptrace_cancel_bpt(current);
623 struct k_sigaction ka;
624
625 if (!oldset)
626 oldset = &current->blocked;
627
628 /* This lets the debugger run, ... */
629 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
630 /* ... so re-check the single stepping. */
631 single_stepping |= ptrace_cancel_bpt(current);
632
633 if (signr > 0) {
634 /* Whee! Actually deliver the signal. */
635 if (r0) syscall_restart(r0, r19, regs, &ka);
636 handle_signal(signr, &ka, &info, oldset, regs, sw);
637 if (single_stepping)
638 ptrace_set_bpt(current); /* re-set bpt */
639 return 1;
640 }
641
642 if (r0) {
643 switch (regs->r0) {
644 case ERESTARTNOHAND:
645 case ERESTARTSYS:
646 case ERESTARTNOINTR:
647 /* Reset v0 and a3 and replay syscall. */
648 regs->r0 = r0;
649 regs->r19 = r19;
650 regs->pc -= 4;
651 break;
652 case ERESTART_RESTARTBLOCK:
653 /* Force v0 to the restart syscall and reply. */
654 regs->r0 = __NR_restart_syscall;
655 regs->pc -= 4;
656 break;
657 }
658 }
659 if (single_stepping)
660 ptrace_set_bpt(current); /* re-set breakpoint */
661
662 return 0;
663}
664
665void
666do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
667 struct switch_stack *sw, unsigned long r0,
668 unsigned long r19, unsigned long thread_info_flags)
669{
670 if (thread_info_flags & _TIF_SIGPENDING)
671 do_signal(oldset, regs, sw, r0, r19);
672}