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/kernel.h>
15 #include <linux/signal.h>
16 #include <linux/errno.h>
17 #include <linux/wait.h>
18 #include <linux/ptrace.h>
19 #include <linux/unistd.h>
20 #include <linux/stddef.h>
21 #include <linux/tty.h>
22 #include <linux/elf.h>
23 #include <linux/personality.h>
24 #include <linux/binfmts.h>
25 #include <linux/freezer.h>
26 #include <linux/io.h>
27 #include <linux/tracehook.h>
28 #include <asm/ucontext.h>
29 #include <asm/uaccess.h>
30 #include <asm/pgtable.h>
31 #include <asm/cacheflush.h>
32 #include <asm/syscalls.h>
33 #include <asm/fpu.h>
34
35 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
36
37 struct fdpic_func_descriptor {
38 unsigned long text;
39 unsigned long GOT;
40 };
41
42 /*
43 * The following define adds a 64 byte gap between the signal
44 * stack frame and previous contents of the stack. This allows
45 * frame unwinding in a function epilogue but only if a frame
46 * pointer is used in the function. This is necessary because
47 * current gcc compilers (<4.3) do not generate unwind info on
48 * SH for function epilogues.
49 */
50 #define UNWINDGUARD 64
51
52 /*
53 * Atomically swap in the new signal mask, and wait for a signal.
54 */
55 asmlinkage int
sys_sigsuspend(old_sigset_t mask,unsigned long r5,unsigned long r6,unsigned long r7,struct pt_regs __regs)56 sys_sigsuspend(old_sigset_t mask,
57 unsigned long r5, unsigned long r6, unsigned long r7,
58 struct pt_regs __regs)
59 {
60 sigset_t blocked;
61
62 current->saved_sigmask = current->blocked;
63
64 mask &= _BLOCKABLE;
65 siginitset(&blocked, mask);
66 set_current_blocked(&blocked);
67
68 current->state = TASK_INTERRUPTIBLE;
69 schedule();
70 set_restore_sigmask();
71
72 return -ERESTARTNOHAND;
73 }
74
75 asmlinkage int
sys_sigaction(int sig,const struct old_sigaction __user * act,struct old_sigaction __user * oact)76 sys_sigaction(int sig, const struct old_sigaction __user *act,
77 struct old_sigaction __user *oact)
78 {
79 struct k_sigaction new_ka, old_ka;
80 int ret;
81
82 if (act) {
83 old_sigset_t mask;
84 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
85 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
86 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
87 return -EFAULT;
88 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
89 __get_user(mask, &act->sa_mask);
90 siginitset(&new_ka.sa.sa_mask, mask);
91 }
92
93 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
94
95 if (!ret && oact) {
96 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
97 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
98 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
99 return -EFAULT;
100 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
101 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
102 }
103
104 return ret;
105 }
106
107 asmlinkage int
sys_sigaltstack(const stack_t __user * uss,stack_t __user * uoss,unsigned long r6,unsigned long r7,struct pt_regs __regs)108 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
109 unsigned long r6, unsigned long r7,
110 struct pt_regs __regs)
111 {
112 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
113
114 return do_sigaltstack(uss, uoss, regs->regs[15]);
115 }
116
117
118 /*
119 * Do a signal return; undo the signal stack.
120 */
121
122 #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
123 #if defined(CONFIG_CPU_SH2)
124 #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */
125 #else
126 #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */
127 #endif
128 #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
129
130 struct sigframe
131 {
132 struct sigcontext sc;
133 unsigned long extramask[_NSIG_WORDS-1];
134 u16 retcode[8];
135 };
136
137 struct rt_sigframe
138 {
139 struct siginfo info;
140 struct ucontext uc;
141 u16 retcode[8];
142 };
143
144 #ifdef CONFIG_SH_FPU
restore_sigcontext_fpu(struct sigcontext __user * sc)145 static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
146 {
147 struct task_struct *tsk = current;
148
149 if (!(boot_cpu_data.flags & CPU_HAS_FPU))
150 return 0;
151
152 set_used_math();
153 return __copy_from_user(&tsk->thread.xstate->hardfpu, &sc->sc_fpregs[0],
154 sizeof(long)*(16*2+2));
155 }
156
save_sigcontext_fpu(struct sigcontext __user * sc,struct pt_regs * regs)157 static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
158 struct pt_regs *regs)
159 {
160 struct task_struct *tsk = current;
161
162 if (!(boot_cpu_data.flags & CPU_HAS_FPU))
163 return 0;
164
165 if (!used_math()) {
166 __put_user(0, &sc->sc_ownedfp);
167 return 0;
168 }
169
170 __put_user(1, &sc->sc_ownedfp);
171
172 /* This will cause a "finit" to be triggered by the next
173 attempted FPU operation by the 'current' process.
174 */
175 clear_used_math();
176
177 unlazy_fpu(tsk, regs);
178 return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.xstate->hardfpu,
179 sizeof(long)*(16*2+2));
180 }
181 #endif /* CONFIG_SH_FPU */
182
183 static int
restore_sigcontext(struct pt_regs * regs,struct sigcontext __user * sc,int * r0_p)184 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
185 {
186 unsigned int err = 0;
187
188 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
189 COPY(regs[1]);
190 COPY(regs[2]); COPY(regs[3]);
191 COPY(regs[4]); COPY(regs[5]);
192 COPY(regs[6]); COPY(regs[7]);
193 COPY(regs[8]); COPY(regs[9]);
194 COPY(regs[10]); COPY(regs[11]);
195 COPY(regs[12]); COPY(regs[13]);
196 COPY(regs[14]); COPY(regs[15]);
197 COPY(gbr); COPY(mach);
198 COPY(macl); COPY(pr);
199 COPY(sr); COPY(pc);
200 #undef COPY
201
202 #ifdef CONFIG_SH_FPU
203 if (boot_cpu_data.flags & CPU_HAS_FPU) {
204 int owned_fp;
205 struct task_struct *tsk = current;
206
207 regs->sr |= SR_FD; /* Release FPU */
208 clear_fpu(tsk, regs);
209 clear_used_math();
210 __get_user (owned_fp, &sc->sc_ownedfp);
211 if (owned_fp)
212 err |= restore_sigcontext_fpu(sc);
213 }
214 #endif
215
216 regs->tra = -1; /* disable syscall checks */
217 err |= __get_user(*r0_p, &sc->sc_regs[0]);
218 return err;
219 }
220
sys_sigreturn(unsigned long r4,unsigned long r5,unsigned long r6,unsigned long r7,struct pt_regs __regs)221 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
222 unsigned long r6, unsigned long r7,
223 struct pt_regs __regs)
224 {
225 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
226 struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15];
227 sigset_t set;
228 int r0;
229
230 /* Always make any pending restarted system calls return -EINTR */
231 current_thread_info()->restart_block.fn = do_no_restart_syscall;
232
233 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
234 goto badframe;
235
236 if (__get_user(set.sig[0], &frame->sc.oldmask)
237 || (_NSIG_WORDS > 1
238 && __copy_from_user(&set.sig[1], &frame->extramask,
239 sizeof(frame->extramask))))
240 goto badframe;
241
242 sigdelsetmask(&set, ~_BLOCKABLE);
243 set_current_blocked(&set);
244
245 if (restore_sigcontext(regs, &frame->sc, &r0))
246 goto badframe;
247 return r0;
248
249 badframe:
250 force_sig(SIGSEGV, current);
251 return 0;
252 }
253
sys_rt_sigreturn(unsigned long r4,unsigned long r5,unsigned long r6,unsigned long r7,struct pt_regs __regs)254 asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
255 unsigned long r6, unsigned long r7,
256 struct pt_regs __regs)
257 {
258 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
259 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15];
260 sigset_t set;
261 int r0;
262
263 /* Always make any pending restarted system calls return -EINTR */
264 current_thread_info()->restart_block.fn = do_no_restart_syscall;
265
266 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
267 goto badframe;
268
269 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
270 goto badframe;
271
272 sigdelsetmask(&set, ~_BLOCKABLE);
273 set_current_blocked(&set);
274
275 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
276 goto badframe;
277
278 if (do_sigaltstack(&frame->uc.uc_stack, NULL,
279 regs->regs[15]) == -EFAULT)
280 goto badframe;
281
282 return r0;
283
284 badframe:
285 force_sig(SIGSEGV, current);
286 return 0;
287 }
288
289 /*
290 * Set up a signal frame.
291 */
292
293 static int
setup_sigcontext(struct sigcontext __user * sc,struct pt_regs * regs,unsigned long mask)294 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
295 unsigned long mask)
296 {
297 int err = 0;
298
299 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
300 COPY(regs[0]); COPY(regs[1]);
301 COPY(regs[2]); COPY(regs[3]);
302 COPY(regs[4]); COPY(regs[5]);
303 COPY(regs[6]); COPY(regs[7]);
304 COPY(regs[8]); COPY(regs[9]);
305 COPY(regs[10]); COPY(regs[11]);
306 COPY(regs[12]); COPY(regs[13]);
307 COPY(regs[14]); COPY(regs[15]);
308 COPY(gbr); COPY(mach);
309 COPY(macl); COPY(pr);
310 COPY(sr); COPY(pc);
311 #undef COPY
312
313 #ifdef CONFIG_SH_FPU
314 err |= save_sigcontext_fpu(sc, regs);
315 #endif
316
317 /* non-iBCS2 extensions.. */
318 err |= __put_user(mask, &sc->oldmask);
319
320 return err;
321 }
322
323 /*
324 * Determine which stack to use..
325 */
326 static inline void __user *
get_sigframe(struct k_sigaction * ka,unsigned long sp,size_t frame_size)327 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
328 {
329 if (ka->sa.sa_flags & SA_ONSTACK) {
330 if (sas_ss_flags(sp) == 0)
331 sp = current->sas_ss_sp + current->sas_ss_size;
332 }
333
334 return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul);
335 }
336
337 /* These symbols are defined with the addresses in the vsyscall page.
338 See vsyscall-trapa.S. */
339 extern void __kernel_sigreturn(void);
340 extern void __kernel_rt_sigreturn(void);
341
setup_frame(int sig,struct k_sigaction * ka,sigset_t * set,struct pt_regs * regs)342 static int setup_frame(int sig, struct k_sigaction *ka,
343 sigset_t *set, struct pt_regs *regs)
344 {
345 struct sigframe __user *frame;
346 int err = 0;
347 int signal;
348
349 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
350
351 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
352 goto give_sigsegv;
353
354 signal = current_thread_info()->exec_domain
355 && current_thread_info()->exec_domain->signal_invmap
356 && sig < 32
357 ? current_thread_info()->exec_domain->signal_invmap[sig]
358 : sig;
359
360 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
361
362 if (_NSIG_WORDS > 1)
363 err |= __copy_to_user(frame->extramask, &set->sig[1],
364 sizeof(frame->extramask));
365
366 /* Set up to return from userspace. If provided, use a stub
367 already in userspace. */
368 if (ka->sa.sa_flags & SA_RESTORER) {
369 regs->pr = (unsigned long) ka->sa.sa_restorer;
370 #ifdef CONFIG_VSYSCALL
371 } else if (likely(current->mm->context.vdso)) {
372 regs->pr = VDSO_SYM(&__kernel_sigreturn);
373 #endif
374 } else {
375 /* Generate return code (system call to sigreturn) */
376 err |= __put_user(MOVW(7), &frame->retcode[0]);
377 err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
378 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
379 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
380 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
381 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
382 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
383 err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
384 regs->pr = (unsigned long) frame->retcode;
385 flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
386 }
387
388 if (err)
389 goto give_sigsegv;
390
391 /* Set up registers for signal handler */
392 regs->regs[15] = (unsigned long) frame;
393 regs->regs[4] = signal; /* Arg for signal handler */
394 regs->regs[5] = 0;
395 regs->regs[6] = (unsigned long) &frame->sc;
396
397 if (current->personality & FDPIC_FUNCPTRS) {
398 struct fdpic_func_descriptor __user *funcptr =
399 (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
400
401 __get_user(regs->pc, &funcptr->text);
402 __get_user(regs->regs[12], &funcptr->GOT);
403 } else
404 regs->pc = (unsigned long)ka->sa.sa_handler;
405
406 set_fs(USER_DS);
407
408 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
409 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
410
411 return 0;
412
413 give_sigsegv:
414 force_sigsegv(sig, current);
415 return -EFAULT;
416 }
417
setup_rt_frame(int sig,struct k_sigaction * ka,siginfo_t * info,sigset_t * set,struct pt_regs * regs)418 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
419 sigset_t *set, struct pt_regs *regs)
420 {
421 struct rt_sigframe __user *frame;
422 int err = 0;
423 int signal;
424
425 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
426
427 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
428 goto give_sigsegv;
429
430 signal = current_thread_info()->exec_domain
431 && current_thread_info()->exec_domain->signal_invmap
432 && sig < 32
433 ? current_thread_info()->exec_domain->signal_invmap[sig]
434 : sig;
435
436 err |= copy_siginfo_to_user(&frame->info, info);
437
438 /* Create the ucontext. */
439 err |= __put_user(0, &frame->uc.uc_flags);
440 err |= __put_user(NULL, &frame->uc.uc_link);
441 err |= __put_user((void *)current->sas_ss_sp,
442 &frame->uc.uc_stack.ss_sp);
443 err |= __put_user(sas_ss_flags(regs->regs[15]),
444 &frame->uc.uc_stack.ss_flags);
445 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
446 err |= setup_sigcontext(&frame->uc.uc_mcontext,
447 regs, set->sig[0]);
448 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
449
450 /* Set up to return from userspace. If provided, use a stub
451 already in userspace. */
452 if (ka->sa.sa_flags & SA_RESTORER) {
453 regs->pr = (unsigned long) ka->sa.sa_restorer;
454 #ifdef CONFIG_VSYSCALL
455 } else if (likely(current->mm->context.vdso)) {
456 regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
457 #endif
458 } else {
459 /* Generate return code (system call to rt_sigreturn) */
460 err |= __put_user(MOVW(7), &frame->retcode[0]);
461 err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
462 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
463 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
464 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
465 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
466 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
467 err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
468 regs->pr = (unsigned long) frame->retcode;
469 flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
470 }
471
472 if (err)
473 goto give_sigsegv;
474
475 /* Set up registers for signal handler */
476 regs->regs[15] = (unsigned long) frame;
477 regs->regs[4] = signal; /* Arg for signal handler */
478 regs->regs[5] = (unsigned long) &frame->info;
479 regs->regs[6] = (unsigned long) &frame->uc;
480
481 if (current->personality & FDPIC_FUNCPTRS) {
482 struct fdpic_func_descriptor __user *funcptr =
483 (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
484
485 __get_user(regs->pc, &funcptr->text);
486 __get_user(regs->regs[12], &funcptr->GOT);
487 } else
488 regs->pc = (unsigned long)ka->sa.sa_handler;
489
490 set_fs(USER_DS);
491
492 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
493 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
494
495 return 0;
496
497 give_sigsegv:
498 force_sigsegv(sig, current);
499 return -EFAULT;
500 }
501
502 static inline void
handle_syscall_restart(unsigned long save_r0,struct pt_regs * regs,struct sigaction * sa)503 handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs,
504 struct sigaction *sa)
505 {
506 /* If we're not from a syscall, bail out */
507 if (regs->tra < 0)
508 return;
509
510 /* check for system call restart.. */
511 switch (regs->regs[0]) {
512 case -ERESTART_RESTARTBLOCK:
513 case -ERESTARTNOHAND:
514 no_system_call_restart:
515 regs->regs[0] = -EINTR;
516 break;
517
518 case -ERESTARTSYS:
519 if (!(sa->sa_flags & SA_RESTART))
520 goto no_system_call_restart;
521 /* fallthrough */
522 case -ERESTARTNOINTR:
523 regs->regs[0] = save_r0;
524 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
525 break;
526 }
527 }
528
529 /*
530 * OK, we're invoking a handler
531 */
532 static int
handle_signal(unsigned long sig,struct k_sigaction * ka,siginfo_t * info,sigset_t * oldset,struct pt_regs * regs,unsigned int save_r0)533 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
534 sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
535 {
536 int ret;
537
538 /* Set up the stack frame */
539 if (ka->sa.sa_flags & SA_SIGINFO)
540 ret = setup_rt_frame(sig, ka, info, oldset, regs);
541 else
542 ret = setup_frame(sig, ka, oldset, regs);
543
544 if (ret == 0)
545 block_sigmask(ka, sig);
546
547 return ret;
548 }
549
550 /*
551 * Note that 'init' is a special process: it doesn't get signals it doesn't
552 * want to handle. Thus you cannot kill init even with a SIGKILL even by
553 * mistake.
554 *
555 * Note that we go through the signals twice: once to check the signals that
556 * the kernel can handle, and then we build all the user-level signal handling
557 * stack-frames in one go after that.
558 */
do_signal(struct pt_regs * regs,unsigned int save_r0)559 static void do_signal(struct pt_regs *regs, unsigned int save_r0)
560 {
561 siginfo_t info;
562 int signr;
563 struct k_sigaction ka;
564 sigset_t *oldset;
565
566 /*
567 * We want the common case to go fast, which
568 * is why we may in certain cases get here from
569 * kernel mode. Just return without doing anything
570 * if so.
571 */
572 if (!user_mode(regs))
573 return;
574
575 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
576 oldset = ¤t->saved_sigmask;
577 else
578 oldset = ¤t->blocked;
579
580 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
581 if (signr > 0) {
582 handle_syscall_restart(save_r0, regs, &ka.sa);
583
584 /* Whee! Actually deliver the signal. */
585 if (handle_signal(signr, &ka, &info, oldset,
586 regs, save_r0) == 0) {
587 /*
588 * A signal was successfully delivered; the saved
589 * sigmask will have been stored in the signal frame,
590 * and will be restored by sigreturn, so we can simply
591 * clear the TS_RESTORE_SIGMASK flag
592 */
593 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
594
595 tracehook_signal_handler(signr, &info, &ka, regs,
596 test_thread_flag(TIF_SINGLESTEP));
597 }
598
599 return;
600 }
601
602 /* Did we come from a system call? */
603 if (regs->tra >= 0) {
604 /* Restart the system call - no handlers present */
605 if (regs->regs[0] == -ERESTARTNOHAND ||
606 regs->regs[0] == -ERESTARTSYS ||
607 regs->regs[0] == -ERESTARTNOINTR) {
608 regs->regs[0] = save_r0;
609 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
610 } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
611 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
612 regs->regs[3] = __NR_restart_syscall;
613 }
614 }
615
616 /*
617 * If there's no signal to deliver, we just put the saved sigmask
618 * back.
619 */
620 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
621 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
622 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
623 }
624 }
625
do_notify_resume(struct pt_regs * regs,unsigned int save_r0,unsigned long thread_info_flags)626 asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
627 unsigned long thread_info_flags)
628 {
629 /* deal with pending signal delivery */
630 if (thread_info_flags & _TIF_SIGPENDING)
631 do_signal(regs, save_r0);
632
633 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
634 clear_thread_flag(TIF_NOTIFY_RESUME);
635 tracehook_notify_resume(regs);
636 if (current->replacement_session_keyring)
637 key_replace_session_keyring();
638 }
639 }
640