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1da177e4 LT |
1 | /* signal.c: FRV specific bits of signal handling |
2 | * | |
3 | * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * - Derived from arch/m68k/kernel/signal.c | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/sched.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/smp.h> | |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/signal.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/unistd.h> | |
22 | #include <linux/personality.h> | |
7dfb7103 | 23 | #include <linux/freezer.h> |
4a3b9893 | 24 | #include <linux/tracehook.h> |
1da177e4 LT |
25 | #include <asm/ucontext.h> |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/cacheflush.h> | |
28 | ||
29 | #define DEBUG_SIG 0 | |
30 | ||
1da177e4 LT |
31 | struct fdpic_func_descriptor { |
32 | unsigned long text; | |
33 | unsigned long GOT; | |
34 | }; | |
35 | ||
1da177e4 LT |
36 | /* |
37 | * Atomically swap in the new signal mask, and wait for a signal. | |
38 | */ | |
39 | asmlinkage int sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
40 | { | |
68f3f16d AV |
41 | sigset_t blocked; |
42 | siginitset(&blocked, mask); | |
43 | return sigsuspend(&blocked); | |
1da177e4 LT |
44 | } |
45 | ||
46 | asmlinkage int sys_sigaction(int sig, | |
47 | const struct old_sigaction __user *act, | |
48 | struct old_sigaction __user *oact) | |
49 | { | |
50 | struct k_sigaction new_ka, old_ka; | |
51 | int ret; | |
52 | ||
53 | if (act) { | |
54 | old_sigset_t mask; | |
55 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
56 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
f0c22cdd AV |
57 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
58 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
59 | __get_user(mask, &act->sa_mask)) | |
1da177e4 | 60 | return -EFAULT; |
1da177e4 LT |
61 | siginitset(&new_ka.sa.sa_mask, mask); |
62 | } | |
63 | ||
64 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
65 | ||
66 | if (!ret && oact) { | |
67 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
68 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
f0c22cdd AV |
69 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
70 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
71 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
1da177e4 | 72 | return -EFAULT; |
1da177e4 LT |
73 | } |
74 | ||
75 | return ret; | |
76 | } | |
77 | ||
78 | asmlinkage | |
79 | int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) | |
80 | { | |
81 | return do_sigaltstack(uss, uoss, __frame->sp); | |
82 | } | |
83 | ||
84 | ||
85 | /* | |
86 | * Do a signal return; undo the signal stack. | |
87 | */ | |
88 | ||
89 | struct sigframe | |
90 | { | |
9e4d11f8 | 91 | __sigrestore_t pretcode; |
1da177e4 LT |
92 | int sig; |
93 | struct sigcontext sc; | |
94 | unsigned long extramask[_NSIG_WORDS-1]; | |
95 | uint32_t retcode[2]; | |
96 | }; | |
97 | ||
98 | struct rt_sigframe | |
99 | { | |
9e4d11f8 | 100 | __sigrestore_t pretcode; |
1da177e4 | 101 | int sig; |
9e4d11f8 AV |
102 | struct siginfo __user *pinfo; |
103 | void __user *puc; | |
1da177e4 LT |
104 | struct siginfo info; |
105 | struct ucontext uc; | |
106 | uint32_t retcode[2]; | |
107 | }; | |
108 | ||
109 | static int restore_sigcontext(struct sigcontext __user *sc, int *_gr8) | |
110 | { | |
111 | struct user_context *user = current->thread.user; | |
112 | unsigned long tbr, psr; | |
113 | ||
20cd514d AV |
114 | /* Always make any pending restarted system calls return -EINTR */ |
115 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
116 | ||
1da177e4 LT |
117 | tbr = user->i.tbr; |
118 | psr = user->i.psr; | |
119 | if (copy_from_user(user, &sc->sc_context, sizeof(sc->sc_context))) | |
120 | goto badframe; | |
121 | user->i.tbr = tbr; | |
122 | user->i.psr = psr; | |
123 | ||
124 | restore_user_regs(user); | |
125 | ||
126 | user->i.syscallno = -1; /* disable syscall checks */ | |
127 | ||
128 | *_gr8 = user->i.gr[8]; | |
129 | return 0; | |
130 | ||
131 | badframe: | |
132 | return 1; | |
133 | } | |
134 | ||
135 | asmlinkage int sys_sigreturn(void) | |
136 | { | |
137 | struct sigframe __user *frame = (struct sigframe __user *) __frame->sp; | |
138 | sigset_t set; | |
139 | int gr8; | |
140 | ||
141 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
142 | goto badframe; | |
143 | if (__get_user(set.sig[0], &frame->sc.sc_oldmask)) | |
144 | goto badframe; | |
145 | ||
146 | if (_NSIG_WORDS > 1 && | |
147 | __copy_from_user(&set.sig[1], &frame->extramask, sizeof(frame->extramask))) | |
148 | goto badframe; | |
149 | ||
7ebe0c5d | 150 | set_current_blocked(&set); |
1da177e4 LT |
151 | |
152 | if (restore_sigcontext(&frame->sc, &gr8)) | |
153 | goto badframe; | |
154 | return gr8; | |
155 | ||
156 | badframe: | |
157 | force_sig(SIGSEGV, current); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | asmlinkage int sys_rt_sigreturn(void) | |
162 | { | |
163 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *) __frame->sp; | |
164 | sigset_t set; | |
165 | int gr8; | |
166 | ||
167 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
168 | goto badframe; | |
169 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
170 | goto badframe; | |
171 | ||
7ebe0c5d | 172 | set_current_blocked(&set); |
1da177e4 LT |
173 | |
174 | if (restore_sigcontext(&frame->uc.uc_mcontext, &gr8)) | |
175 | goto badframe; | |
176 | ||
177 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, __frame->sp) == -EFAULT) | |
178 | goto badframe; | |
179 | ||
180 | return gr8; | |
181 | ||
182 | badframe: | |
183 | force_sig(SIGSEGV, current); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Set up a signal frame | |
189 | */ | |
190 | static int setup_sigcontext(struct sigcontext __user *sc, unsigned long mask) | |
191 | { | |
192 | save_user_regs(current->thread.user); | |
193 | ||
194 | if (copy_to_user(&sc->sc_context, current->thread.user, sizeof(sc->sc_context)) != 0) | |
195 | goto badframe; | |
196 | ||
197 | /* non-iBCS2 extensions.. */ | |
198 | if (__put_user(mask, &sc->sc_oldmask) < 0) | |
199 | goto badframe; | |
200 | ||
201 | return 0; | |
202 | ||
203 | badframe: | |
204 | return 1; | |
205 | } | |
206 | ||
207 | /*****************************************************************************/ | |
208 | /* | |
209 | * Determine which stack to use.. | |
210 | */ | |
211 | static inline void __user *get_sigframe(struct k_sigaction *ka, | |
1da177e4 LT |
212 | size_t frame_size) |
213 | { | |
214 | unsigned long sp; | |
215 | ||
216 | /* Default to using normal stack */ | |
fef2b580 | 217 | sp = __frame->sp; |
1da177e4 LT |
218 | |
219 | /* This is the X/Open sanctioned signal stack switching. */ | |
220 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
d09042da | 221 | if (! sas_ss_flags(sp)) |
1da177e4 LT |
222 | sp = current->sas_ss_sp + current->sas_ss_size; |
223 | } | |
224 | ||
225 | return (void __user *) ((sp - frame_size) & ~7UL); | |
fef2b580 | 226 | |
1da177e4 LT |
227 | } /* end get_sigframe() */ |
228 | ||
229 | /*****************************************************************************/ | |
230 | /* | |
231 | * | |
232 | */ | |
fef2b580 | 233 | static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set) |
1da177e4 LT |
234 | { |
235 | struct sigframe __user *frame; | |
236 | int rsig; | |
237 | ||
5f4ad04a AV |
238 | set_fs(USER_DS); |
239 | ||
fef2b580 | 240 | frame = get_sigframe(ka, sizeof(*frame)); |
1da177e4 LT |
241 | |
242 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
243 | goto give_sigsegv; | |
244 | ||
245 | rsig = sig; | |
246 | if (sig < 32 && | |
247 | __current_thread_info->exec_domain && | |
248 | __current_thread_info->exec_domain->signal_invmap) | |
249 | rsig = __current_thread_info->exec_domain->signal_invmap[sig]; | |
250 | ||
251 | if (__put_user(rsig, &frame->sig) < 0) | |
252 | goto give_sigsegv; | |
253 | ||
254 | if (setup_sigcontext(&frame->sc, set->sig[0])) | |
255 | goto give_sigsegv; | |
256 | ||
257 | if (_NSIG_WORDS > 1) { | |
258 | if (__copy_to_user(frame->extramask, &set->sig[1], | |
259 | sizeof(frame->extramask))) | |
260 | goto give_sigsegv; | |
261 | } | |
262 | ||
263 | /* Set up to return from userspace. If provided, use a stub | |
264 | * already in userspace. */ | |
265 | if (ka->sa.sa_flags & SA_RESTORER) { | |
266 | if (__put_user(ka->sa.sa_restorer, &frame->pretcode) < 0) | |
267 | goto give_sigsegv; | |
268 | } | |
269 | else { | |
270 | /* Set up the following code on the stack: | |
271 | * setlos #__NR_sigreturn,gr7 | |
272 | * tira gr0,0 | |
273 | */ | |
9e4d11f8 | 274 | if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) || |
1da177e4 LT |
275 | __put_user(0x8efc0000|__NR_sigreturn, &frame->retcode[0]) || |
276 | __put_user(0xc0700000, &frame->retcode[1])) | |
277 | goto give_sigsegv; | |
278 | ||
279 | flush_icache_range((unsigned long) frame->retcode, | |
280 | (unsigned long) (frame->retcode + 2)); | |
281 | } | |
282 | ||
5f4ad04a | 283 | /* Set up registers for the signal handler */ |
ecd0fa98 | 284 | if (current->personality & FDPIC_FUNCPTRS) { |
1da177e4 | 285 | struct fdpic_func_descriptor __user *funcptr = |
9e4d11f8 | 286 | (struct fdpic_func_descriptor __user *) ka->sa.sa_handler; |
5f4ad04a AV |
287 | struct fdpic_func_descriptor desc; |
288 | if (copy_from_user(&desc, funcptr, sizeof(desc))) | |
289 | goto give_sigsegv; | |
290 | __frame->pc = desc.text; | |
291 | __frame->gr15 = desc.GOT; | |
1da177e4 | 292 | } else { |
fef2b580 DH |
293 | __frame->pc = (unsigned long) ka->sa.sa_handler; |
294 | __frame->gr15 = 0; | |
1da177e4 LT |
295 | } |
296 | ||
5f4ad04a AV |
297 | __frame->sp = (unsigned long) frame; |
298 | __frame->lr = (unsigned long) &frame->retcode; | |
299 | __frame->gr8 = sig; | |
1da177e4 | 300 | |
8efc0ab5 DH |
301 | /* the tracer may want to single-step inside the handler */ |
302 | if (test_thread_flag(TIF_SINGLESTEP)) | |
303 | ptrace_notify(SIGTRAP); | |
304 | ||
1da177e4 LT |
305 | #if DEBUG_SIG |
306 | printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", | |
fef2b580 | 307 | sig, current->comm, current->pid, frame, __frame->pc, |
8efc0ab5 | 308 | frame->pretcode); |
1da177e4 LT |
309 | #endif |
310 | ||
a411aee9 | 311 | return 0; |
1da177e4 LT |
312 | |
313 | give_sigsegv: | |
ad0acab4 | 314 | force_sigsegv(sig, current); |
a411aee9 | 315 | return -EFAULT; |
8efc0ab5 | 316 | |
1da177e4 LT |
317 | } /* end setup_frame() */ |
318 | ||
319 | /*****************************************************************************/ | |
320 | /* | |
321 | * | |
322 | */ | |
8efc0ab5 | 323 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
fef2b580 | 324 | sigset_t *set) |
1da177e4 LT |
325 | { |
326 | struct rt_sigframe __user *frame; | |
327 | int rsig; | |
328 | ||
5f4ad04a AV |
329 | set_fs(USER_DS); |
330 | ||
fef2b580 | 331 | frame = get_sigframe(ka, sizeof(*frame)); |
1da177e4 LT |
332 | |
333 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
334 | goto give_sigsegv; | |
335 | ||
336 | rsig = sig; | |
337 | if (sig < 32 && | |
338 | __current_thread_info->exec_domain && | |
339 | __current_thread_info->exec_domain->signal_invmap) | |
340 | rsig = __current_thread_info->exec_domain->signal_invmap[sig]; | |
341 | ||
342 | if (__put_user(rsig, &frame->sig) || | |
343 | __put_user(&frame->info, &frame->pinfo) || | |
344 | __put_user(&frame->uc, &frame->puc)) | |
345 | goto give_sigsegv; | |
346 | ||
347 | if (copy_siginfo_to_user(&frame->info, info)) | |
348 | goto give_sigsegv; | |
349 | ||
350 | /* Create the ucontext. */ | |
351 | if (__put_user(0, &frame->uc.uc_flags) || | |
9e4d11f8 AV |
352 | __put_user(NULL, &frame->uc.uc_link) || |
353 | __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) || | |
fef2b580 | 354 | __put_user(sas_ss_flags(__frame->sp), &frame->uc.uc_stack.ss_flags) || |
1da177e4 LT |
355 | __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size)) |
356 | goto give_sigsegv; | |
357 | ||
358 | if (setup_sigcontext(&frame->uc.uc_mcontext, set->sig[0])) | |
359 | goto give_sigsegv; | |
360 | ||
361 | if (__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set))) | |
362 | goto give_sigsegv; | |
363 | ||
364 | /* Set up to return from userspace. If provided, use a stub | |
365 | * already in userspace. */ | |
366 | if (ka->sa.sa_flags & SA_RESTORER) { | |
367 | if (__put_user(ka->sa.sa_restorer, &frame->pretcode)) | |
368 | goto give_sigsegv; | |
369 | } | |
370 | else { | |
371 | /* Set up the following code on the stack: | |
372 | * setlos #__NR_sigreturn,gr7 | |
373 | * tira gr0,0 | |
374 | */ | |
9e4d11f8 | 375 | if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) || |
1da177e4 LT |
376 | __put_user(0x8efc0000|__NR_rt_sigreturn, &frame->retcode[0]) || |
377 | __put_user(0xc0700000, &frame->retcode[1])) | |
378 | goto give_sigsegv; | |
379 | ||
380 | flush_icache_range((unsigned long) frame->retcode, | |
381 | (unsigned long) (frame->retcode + 2)); | |
382 | } | |
383 | ||
384 | /* Set up registers for signal handler */ | |
ecd0fa98 | 385 | if (current->personality & FDPIC_FUNCPTRS) { |
9e4d11f8 | 386 | struct fdpic_func_descriptor __user *funcptr = |
1da177e4 | 387 | (struct fdpic_func_descriptor __user *) ka->sa.sa_handler; |
5f4ad04a AV |
388 | struct fdpic_func_descriptor desc; |
389 | if (copy_from_user(&desc, funcptr, sizeof(desc))) | |
390 | goto give_sigsegv; | |
391 | __frame->pc = desc.text; | |
392 | __frame->gr15 = desc.GOT; | |
1da177e4 | 393 | } else { |
fef2b580 DH |
394 | __frame->pc = (unsigned long) ka->sa.sa_handler; |
395 | __frame->gr15 = 0; | |
1da177e4 LT |
396 | } |
397 | ||
5f4ad04a AV |
398 | __frame->sp = (unsigned long) frame; |
399 | __frame->lr = (unsigned long) &frame->retcode; | |
400 | __frame->gr8 = sig; | |
401 | __frame->gr9 = (unsigned long) &frame->info; | |
1da177e4 | 402 | |
8efc0ab5 DH |
403 | /* the tracer may want to single-step inside the handler */ |
404 | if (test_thread_flag(TIF_SINGLESTEP)) | |
405 | ptrace_notify(SIGTRAP); | |
406 | ||
1da177e4 LT |
407 | #if DEBUG_SIG |
408 | printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n", | |
fef2b580 | 409 | sig, current->comm, current->pid, frame, __frame->pc, |
8efc0ab5 | 410 | frame->pretcode); |
1da177e4 LT |
411 | #endif |
412 | ||
a411aee9 | 413 | return 0; |
1da177e4 LT |
414 | |
415 | give_sigsegv: | |
ad0acab4 | 416 | force_sigsegv(sig, current); |
a411aee9 | 417 | return -EFAULT; |
1da177e4 LT |
418 | |
419 | } /* end setup_rt_frame() */ | |
420 | ||
421 | /*****************************************************************************/ | |
422 | /* | |
423 | * OK, we're invoking a handler | |
424 | */ | |
a610d6e6 | 425 | static void handle_signal(unsigned long sig, siginfo_t *info, |
b7f9a11a | 426 | struct k_sigaction *ka) |
1da177e4 | 427 | { |
b7f9a11a | 428 | sigset_t *oldset = sigmask_to_save(); |
8efc0ab5 DH |
429 | int ret; |
430 | ||
1da177e4 | 431 | /* Are we from a system call? */ |
ed1cde68 | 432 | if (__frame->syscallno != -1) { |
1da177e4 | 433 | /* If so, check system call restarting.. */ |
fef2b580 | 434 | switch (__frame->gr8) { |
1da177e4 LT |
435 | case -ERESTART_RESTARTBLOCK: |
436 | case -ERESTARTNOHAND: | |
fef2b580 | 437 | __frame->gr8 = -EINTR; |
1da177e4 LT |
438 | break; |
439 | ||
440 | case -ERESTARTSYS: | |
441 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
fef2b580 | 442 | __frame->gr8 = -EINTR; |
1da177e4 LT |
443 | break; |
444 | } | |
8efc0ab5 | 445 | |
1da177e4 LT |
446 | /* fallthrough */ |
447 | case -ERESTARTNOINTR: | |
fef2b580 DH |
448 | __frame->gr8 = __frame->orig_gr8; |
449 | __frame->pc -= 4; | |
1da177e4 | 450 | } |
ed1cde68 | 451 | __frame->syscallno = -1; |
1da177e4 LT |
452 | } |
453 | ||
454 | /* Set up the stack frame */ | |
455 | if (ka->sa.sa_flags & SA_SIGINFO) | |
fef2b580 | 456 | ret = setup_rt_frame(sig, ka, info, oldset); |
1da177e4 | 457 | else |
fef2b580 | 458 | ret = setup_frame(sig, ka, oldset); |
8efc0ab5 | 459 | |
a610d6e6 AV |
460 | if (ret) |
461 | return; | |
1da177e4 | 462 | |
efee984c | 463 | signal_delivered(sig, info, ka, __frame, |
a610d6e6 | 464 | test_thread_flag(TIF_SINGLESTEP)); |
1da177e4 LT |
465 | } /* end handle_signal() */ |
466 | ||
467 | /*****************************************************************************/ | |
468 | /* | |
469 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
470 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
471 | * mistake. | |
472 | */ | |
a411aee9 | 473 | static void do_signal(void) |
1da177e4 LT |
474 | { |
475 | struct k_sigaction ka; | |
476 | siginfo_t info; | |
477 | int signr; | |
478 | ||
fef2b580 | 479 | signr = get_signal_to_deliver(&info, &ka, __frame, NULL); |
a411aee9 | 480 | if (signr > 0) { |
a610d6e6 | 481 | handle_signal(signr, &info, &ka); |
a411aee9 DH |
482 | return; |
483 | } | |
1da177e4 | 484 | |
1da177e4 | 485 | /* Did we come from a system call? */ |
c896a2e0 | 486 | if (__frame->syscallno != -1) { |
1da177e4 | 487 | /* Restart the system call - no handlers present */ |
a411aee9 DH |
488 | switch (__frame->gr8) { |
489 | case -ERESTARTNOHAND: | |
490 | case -ERESTARTSYS: | |
491 | case -ERESTARTNOINTR: | |
fef2b580 DH |
492 | __frame->gr8 = __frame->orig_gr8; |
493 | __frame->pc -= 4; | |
a411aee9 | 494 | break; |
1da177e4 | 495 | |
a411aee9 | 496 | case -ERESTART_RESTARTBLOCK: |
44c7afff | 497 | __frame->gr7 = __NR_restart_syscall; |
fef2b580 | 498 | __frame->pc -= 4; |
a411aee9 | 499 | break; |
1da177e4 | 500 | } |
ed1cde68 | 501 | __frame->syscallno = -1; |
1da177e4 LT |
502 | } |
503 | ||
a411aee9 DH |
504 | /* if there's no signal to deliver, we just put the saved sigmask |
505 | * back */ | |
51a7b448 | 506 | restore_saved_sigmask(); |
1da177e4 LT |
507 | } /* end do_signal() */ |
508 | ||
509 | /*****************************************************************************/ | |
510 | /* | |
511 | * notification of userspace execution resumption | |
a411aee9 | 512 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 LT |
513 | */ |
514 | asmlinkage void do_notify_resume(__u32 thread_info_flags) | |
515 | { | |
516 | /* pending single-step? */ | |
517 | if (thread_info_flags & _TIF_SINGLESTEP) | |
518 | clear_thread_flag(TIF_SINGLESTEP); | |
519 | ||
520 | /* deal with pending signal delivery */ | |
6fd84c08 | 521 | if (thread_info_flags & _TIF_SIGPENDING)) |
a411aee9 | 522 | do_signal(); |
1da177e4 | 523 | |
b7bab880 DH |
524 | /* deal with notification on about to resume userspace execution */ |
525 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
526 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
4a3b9893 | 527 | tracehook_notify_resume(__frame); |
b7bab880 DH |
528 | } |
529 | ||
1da177e4 | 530 | } /* end do_notify_resume() */ |