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1da177e4 LT |
1 | /* |
2 | * linux/arch/cris/kernel/signal.c | |
3 | * | |
4 | * Based on arch/i386/kernel/signal.c by | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson * | |
7 | * | |
8 | * Ideas also taken from arch/arm. | |
9 | * | |
a4858d4d | 10 | * Copyright (C) 2000-2007 Axis Communications AB |
1da177e4 LT |
11 | * |
12 | * Authors: Bjorn Wesen (bjornw@axis.com) | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/sched.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/smp.h> | |
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/signal.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/wait.h> | |
23 | #include <linux/ptrace.h> | |
24 | #include <linux/unistd.h> | |
25 | #include <linux/stddef.h> | |
26 | ||
27 | #include <asm/processor.h> | |
28 | #include <asm/ucontext.h> | |
29 | #include <asm/uaccess.h> | |
30 | ||
31 | #define DEBUG_SIG 0 | |
32 | ||
33 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
34 | ||
35 | /* a syscall in Linux/CRIS is a break 13 instruction which is 2 bytes */ | |
36 | /* manipulate regs so that upon return, it will be re-executed */ | |
37 | ||
38 | /* We rely on that pc points to the instruction after "break 13", so the | |
39 | * library must never do strange things like putting it in a delay slot. | |
40 | */ | |
41 | #define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->irp -= 2; | |
42 | ||
a4858d4d | 43 | void do_signal(int canrestart, struct pt_regs *regs); |
1da177e4 LT |
44 | |
45 | /* | |
a4858d4d | 46 | * Atomically swap in the new signal mask, and wait for a signal. Define |
1da177e4 LT |
47 | * dummy arguments to be able to reach the regs argument. (Note that this |
48 | * arrangement relies on old_sigset_t occupying one register.) | |
49 | */ | |
a4858d4d JN |
50 | int sys_sigsuspend(old_sigset_t mask, long r11, long r12, long r13, long mof, |
51 | long srp, struct pt_regs *regs) | |
1da177e4 | 52 | { |
1da177e4 LT |
53 | mask &= _BLOCKABLE; |
54 | spin_lock_irq(¤t->sighand->siglock); | |
a4858d4d | 55 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
56 | siginitset(¤t->blocked, mask); |
57 | recalc_sigpending(); | |
58 | spin_unlock_irq(¤t->sighand->siglock); | |
a4858d4d JN |
59 | current->state = TASK_INTERRUPTIBLE; |
60 | schedule(); | |
61 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
62 | return -ERESTARTNOHAND; | |
1da177e4 LT |
63 | } |
64 | ||
a4858d4d JN |
65 | int sys_sigaction(int sig, const struct old_sigaction __user *act, |
66 | struct old_sigaction *oact) | |
1da177e4 LT |
67 | { |
68 | struct k_sigaction new_ka, old_ka; | |
69 | int ret; | |
70 | ||
71 | if (act) { | |
72 | old_sigset_t mask; | |
73 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
74 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
75 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
76 | return -EFAULT; | |
77 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
78 | __get_user(mask, &act->sa_mask); | |
79 | siginitset(&new_ka.sa.sa_mask, mask); | |
80 | } | |
81 | ||
82 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
83 | ||
84 | if (!ret && oact) { | |
85 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
86 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
87 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
88 | return -EFAULT; | |
89 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
90 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
91 | } | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
a4858d4d | 96 | int sys_sigaltstack(const stack_t *uss, stack_t __user *uoss) |
1da177e4 LT |
97 | { |
98 | return do_sigaltstack(uss, uoss, rdusp()); | |
99 | } | |
100 | ||
101 | ||
102 | /* | |
103 | * Do a signal return; undo the signal stack. | |
104 | */ | |
105 | ||
106 | struct sigframe { | |
107 | struct sigcontext sc; | |
108 | unsigned long extramask[_NSIG_WORDS-1]; | |
109 | unsigned char retcode[8]; /* trampoline code */ | |
110 | }; | |
111 | ||
112 | struct rt_sigframe { | |
113 | struct siginfo *pinfo; | |
114 | void *puc; | |
115 | struct siginfo info; | |
116 | struct ucontext uc; | |
117 | unsigned char retcode[8]; /* trampoline code */ | |
118 | }; | |
119 | ||
120 | ||
121 | static int | |
122 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) | |
123 | { | |
124 | unsigned int err = 0; | |
125 | unsigned long old_usp; | |
126 | ||
127 | /* Always make any pending restarted system calls return -EINTR */ | |
128 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
129 | ||
130 | /* restore the regs from &sc->regs (same as sc, since regs is first) | |
131 | * (sc is already checked for VERIFY_READ since the sigframe was | |
132 | * checked in sys_sigreturn previously) | |
133 | */ | |
134 | ||
135 | if (__copy_from_user(regs, sc, sizeof(struct pt_regs))) | |
136 | goto badframe; | |
137 | ||
138 | /* make sure the U-flag is set so user-mode cannot fool us */ | |
139 | ||
140 | regs->dccr |= 1 << 8; | |
141 | ||
142 | /* restore the old USP as it was before we stacked the sc etc. | |
143 | * (we cannot just pop the sigcontext since we aligned the sp and | |
144 | * stuff after pushing it) | |
145 | */ | |
146 | ||
147 | err |= __get_user(old_usp, &sc->usp); | |
148 | ||
149 | wrusp(old_usp); | |
150 | ||
151 | /* TODO: the other ports use regs->orig_XX to disable syscall checks | |
152 | * after this completes, but we don't use that mechanism. maybe we can | |
a4858d4d | 153 | * use it now ? |
1da177e4 LT |
154 | */ |
155 | ||
156 | return err; | |
157 | ||
158 | badframe: | |
159 | return 1; | |
160 | } | |
161 | ||
162 | /* Define dummy arguments to be able to reach the regs argument. */ | |
163 | ||
a4858d4d | 164 | asmlinkage int sys_sigreturn(long r10, long r11, long r12, long r13, long mof, |
1da177e4 LT |
165 | long srp, struct pt_regs *regs) |
166 | { | |
167 | struct sigframe __user *frame = (struct sigframe *)rdusp(); | |
168 | sigset_t set; | |
169 | ||
170 | /* | |
171 | * Since we stacked the signal on a dword boundary, | |
172 | * then frame should be dword aligned here. If it's | |
173 | * not, then the user is trying to mess with us. | |
174 | */ | |
175 | if (((long)frame) & 3) | |
176 | goto badframe; | |
177 | ||
178 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
179 | goto badframe; | |
180 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
181 | || (_NSIG_WORDS > 1 | |
182 | && __copy_from_user(&set.sig[1], frame->extramask, | |
183 | sizeof(frame->extramask)))) | |
184 | goto badframe; | |
185 | ||
186 | sigdelsetmask(&set, ~_BLOCKABLE); | |
187 | spin_lock_irq(¤t->sighand->siglock); | |
188 | current->blocked = set; | |
189 | recalc_sigpending(); | |
190 | spin_unlock_irq(¤t->sighand->siglock); | |
a4858d4d | 191 | |
1da177e4 LT |
192 | if (restore_sigcontext(regs, &frame->sc)) |
193 | goto badframe; | |
194 | ||
195 | /* TODO: SIGTRAP when single-stepping as in arm ? */ | |
196 | ||
197 | return regs->r10; | |
198 | ||
199 | badframe: | |
200 | force_sig(SIGSEGV, current); | |
201 | return 0; | |
a4858d4d | 202 | } |
1da177e4 LT |
203 | |
204 | /* Define dummy arguments to be able to reach the regs argument. */ | |
205 | ||
a4858d4d | 206 | asmlinkage int sys_rt_sigreturn(long r10, long r11, long r12, long r13, |
1da177e4 LT |
207 | long mof, long srp, struct pt_regs *regs) |
208 | { | |
209 | struct rt_sigframe __user *frame = (struct rt_sigframe *)rdusp(); | |
210 | sigset_t set; | |
211 | ||
212 | /* | |
213 | * Since we stacked the signal on a dword boundary, | |
214 | * then frame should be dword aligned here. If it's | |
215 | * not, then the user is trying to mess with us. | |
216 | */ | |
217 | if (((long)frame) & 3) | |
218 | goto badframe; | |
219 | ||
220 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
221 | goto badframe; | |
222 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
223 | goto badframe; | |
224 | ||
225 | sigdelsetmask(&set, ~_BLOCKABLE); | |
226 | spin_lock_irq(¤t->sighand->siglock); | |
227 | current->blocked = set; | |
228 | recalc_sigpending(); | |
229 | spin_unlock_irq(¤t->sighand->siglock); | |
a4858d4d | 230 | |
1da177e4 LT |
231 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) |
232 | goto badframe; | |
233 | ||
234 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, rdusp()) == -EFAULT) | |
235 | goto badframe; | |
236 | ||
237 | return regs->r10; | |
238 | ||
239 | badframe: | |
240 | force_sig(SIGSEGV, current); | |
241 | return 0; | |
a4858d4d | 242 | } |
1da177e4 LT |
243 | |
244 | /* | |
245 | * Set up a signal frame. | |
246 | */ | |
247 | ||
a4858d4d JN |
248 | static int setup_sigcontext(struct sigcontext __user *sc, |
249 | struct pt_regs *regs, unsigned long mask) | |
1da177e4 LT |
250 | { |
251 | int err = 0; | |
252 | unsigned long usp = rdusp(); | |
253 | ||
254 | /* copy the regs. they are first in sc so we can use sc directly */ | |
255 | ||
256 | err |= __copy_to_user(sc, regs, sizeof(struct pt_regs)); | |
257 | ||
258 | /* Set the frametype to CRIS_FRAME_NORMAL for the execution of | |
259 | the signal handler. The frametype will be restored to its previous | |
260 | value in restore_sigcontext. */ | |
261 | regs->frametype = CRIS_FRAME_NORMAL; | |
262 | ||
263 | /* then some other stuff */ | |
264 | ||
265 | err |= __put_user(mask, &sc->oldmask); | |
266 | ||
267 | err |= __put_user(usp, &sc->usp); | |
268 | ||
269 | return err; | |
270 | } | |
271 | ||
a4858d4d JN |
272 | /* Figure out where we want to put the new signal frame |
273 | * - usually on the stack. */ | |
1da177e4 LT |
274 | |
275 | static inline void __user * | |
a4858d4d | 276 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) |
1da177e4 LT |
277 | { |
278 | unsigned long sp = rdusp(); | |
279 | ||
280 | /* This is the X/Open sanctioned signal stack switching. */ | |
281 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
282 | if (! on_sig_stack(sp)) | |
283 | sp = current->sas_ss_sp + current->sas_ss_size; | |
284 | } | |
285 | ||
286 | /* make sure the frame is dword-aligned */ | |
287 | ||
288 | sp &= ~3; | |
289 | ||
290 | return (void __user*)(sp - frame_size); | |
291 | } | |
292 | ||
293 | /* grab and setup a signal frame. | |
a4858d4d | 294 | * |
1da177e4 LT |
295 | * basically we stack a lot of state info, and arrange for the |
296 | * user-mode program to return to the kernel using either a | |
297 | * trampoline which performs the syscall sigreturn, or a provided | |
298 | * user-mode trampoline. | |
299 | */ | |
300 | ||
a4858d4d JN |
301 | static int setup_frame(int sig, struct k_sigaction *ka, |
302 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 LT |
303 | { |
304 | struct sigframe __user *frame; | |
305 | unsigned long return_ip; | |
306 | int err = 0; | |
307 | ||
308 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
309 | ||
310 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
311 | goto give_sigsegv; | |
312 | ||
313 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
314 | if (err) | |
315 | goto give_sigsegv; | |
316 | ||
317 | if (_NSIG_WORDS > 1) { | |
318 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
319 | sizeof(frame->extramask)); | |
320 | } | |
321 | if (err) | |
322 | goto give_sigsegv; | |
323 | ||
324 | /* Set up to return from userspace. If provided, use a stub | |
325 | already in userspace. */ | |
326 | if (ka->sa.sa_flags & SA_RESTORER) { | |
327 | return_ip = (unsigned long)ka->sa.sa_restorer; | |
328 | } else { | |
329 | /* trampoline - the desired return ip is the retcode itself */ | |
330 | return_ip = (unsigned long)&frame->retcode; | |
331 | /* This is movu.w __NR_sigreturn, r9; break 13; */ | |
332 | err |= __put_user(0x9c5f, (short __user*)(frame->retcode+0)); | |
333 | err |= __put_user(__NR_sigreturn, (short __user*)(frame->retcode+2)); | |
334 | err |= __put_user(0xe93d, (short __user*)(frame->retcode+4)); | |
335 | } | |
336 | ||
337 | if (err) | |
338 | goto give_sigsegv; | |
339 | ||
340 | /* Set up registers for signal handler */ | |
341 | ||
342 | regs->irp = (unsigned long) ka->sa.sa_handler; /* what we enter NOW */ | |
343 | regs->srp = return_ip; /* what we enter LATER */ | |
344 | regs->r10 = sig; /* first argument is signo */ | |
345 | ||
346 | /* actually move the usp to reflect the stacked frame */ | |
347 | ||
348 | wrusp((unsigned long)frame); | |
349 | ||
a4858d4d | 350 | return 0; |
1da177e4 LT |
351 | |
352 | give_sigsegv: | |
353 | force_sigsegv(sig, current); | |
a4858d4d | 354 | return -EFAULT; |
1da177e4 LT |
355 | } |
356 | ||
a4858d4d JN |
357 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
358 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 LT |
359 | { |
360 | struct rt_sigframe __user *frame; | |
361 | unsigned long return_ip; | |
362 | int err = 0; | |
363 | ||
364 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
365 | ||
366 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
367 | goto give_sigsegv; | |
368 | ||
369 | err |= __put_user(&frame->info, &frame->pinfo); | |
370 | err |= __put_user(&frame->uc, &frame->puc); | |
371 | err |= copy_siginfo_to_user(&frame->info, info); | |
372 | if (err) | |
373 | goto give_sigsegv; | |
374 | ||
375 | /* Clear all the bits of the ucontext we don't use. */ | |
376 | err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext)); | |
377 | ||
378 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); | |
379 | ||
380 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
381 | ||
382 | if (err) | |
383 | goto give_sigsegv; | |
384 | ||
385 | /* Set up to return from userspace. If provided, use a stub | |
386 | already in userspace. */ | |
387 | if (ka->sa.sa_flags & SA_RESTORER) { | |
388 | return_ip = (unsigned long)ka->sa.sa_restorer; | |
389 | } else { | |
390 | /* trampoline - the desired return ip is the retcode itself */ | |
391 | return_ip = (unsigned long)&frame->retcode; | |
392 | /* This is movu.w __NR_rt_sigreturn, r9; break 13; */ | |
a4858d4d JN |
393 | err |= __put_user(0x9c5f, (short __user *)(frame->retcode+0)); |
394 | err |= __put_user(__NR_rt_sigreturn, | |
395 | (short __user *)(frame->retcode+2)); | |
396 | err |= __put_user(0xe93d, (short __user *)(frame->retcode+4)); | |
1da177e4 LT |
397 | } |
398 | ||
399 | if (err) | |
400 | goto give_sigsegv; | |
401 | ||
402 | /* TODO what is the current->exec_domain stuff and invmap ? */ | |
403 | ||
404 | /* Set up registers for signal handler */ | |
405 | ||
a4858d4d JN |
406 | /* What we enter NOW */ |
407 | regs->irp = (unsigned long) ka->sa.sa_handler; | |
408 | /* What we enter LATER */ | |
409 | regs->srp = return_ip; | |
410 | /* First argument is signo */ | |
411 | regs->r10 = sig; | |
412 | /* Second argument is (siginfo_t *) */ | |
413 | regs->r11 = (unsigned long)&frame->info; | |
414 | /* Third argument is unused */ | |
415 | regs->r12 = 0; | |
416 | ||
417 | /* Actually move the usp to reflect the stacked frame */ | |
1da177e4 LT |
418 | wrusp((unsigned long)frame); |
419 | ||
a4858d4d | 420 | return 0; |
1da177e4 LT |
421 | |
422 | give_sigsegv: | |
423 | force_sigsegv(sig, current); | |
a4858d4d | 424 | return -EFAULT; |
1da177e4 LT |
425 | } |
426 | ||
427 | /* | |
428 | * OK, we're invoking a handler | |
a4858d4d | 429 | */ |
1da177e4 | 430 | |
a4858d4d JN |
431 | static inline int handle_signal(int canrestart, unsigned long sig, |
432 | siginfo_t *info, struct k_sigaction *ka, | |
433 | sigset_t *oldset, struct pt_regs *regs) | |
1da177e4 | 434 | { |
a4858d4d JN |
435 | int ret; |
436 | ||
1da177e4 LT |
437 | /* Are we from a system call? */ |
438 | if (canrestart) { | |
439 | /* If so, check system call restarting.. */ | |
440 | switch (regs->r10) { | |
a4858d4d JN |
441 | case -ERESTART_RESTARTBLOCK: |
442 | case -ERESTARTNOHAND: | |
443 | /* ERESTARTNOHAND means that the syscall should | |
444 | * only be restarted if there was no handler for | |
445 | * the signal, and since we only get here if there | |
446 | * is a handler, we don't restart */ | |
447 | regs->r10 = -EINTR; | |
448 | break; | |
449 | case -ERESTARTSYS: | |
450 | /* ERESTARTSYS means to restart the syscall if | |
451 | * there is no handler or the handler was | |
452 | * registered with SA_RESTART */ | |
453 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
1da177e4 LT |
454 | regs->r10 = -EINTR; |
455 | break; | |
a4858d4d JN |
456 | } |
457 | /* fallthrough */ | |
458 | case -ERESTARTNOINTR: | |
459 | /* ERESTARTNOINTR means that the syscall should | |
460 | * be called again after the signal handler returns. */ | |
461 | RESTART_CRIS_SYS(regs); | |
1da177e4 LT |
462 | } |
463 | } | |
464 | ||
465 | /* Set up the stack frame */ | |
466 | if (ka->sa.sa_flags & SA_SIGINFO) | |
a4858d4d | 467 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 468 | else |
a4858d4d JN |
469 | ret = setup_frame(sig, ka, oldset, regs); |
470 | ||
471 | if (ret == 0) { | |
472 | spin_lock_irq(¤t->sighand->siglock); | |
473 | sigorsets(¤t->blocked, ¤t->blocked, | |
474 | &ka->sa.sa_mask); | |
475 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
476 | sigaddset(¤t->blocked, sig); | |
477 | recalc_sigpending(); | |
478 | spin_unlock_irq(¤t->sighand->siglock); | |
479 | } | |
480 | return ret; | |
1da177e4 LT |
481 | } |
482 | ||
483 | /* | |
484 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
485 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
486 | * mistake. | |
487 | * | |
488 | * Also note that the regs structure given here as an argument, is the latest | |
489 | * pushed pt_regs. It may or may not be the same as the first pushed registers | |
490 | * when the initial usermode->kernelmode transition took place. Therefore | |
491 | * we can use user_mode(regs) to see if we came directly from kernel or user | |
492 | * mode below. | |
493 | */ | |
494 | ||
a4858d4d | 495 | void do_signal(int canrestart, struct pt_regs *regs) |
1da177e4 LT |
496 | { |
497 | siginfo_t info; | |
498 | int signr; | |
499 | struct k_sigaction ka; | |
a4858d4d | 500 | sigset_t *oldset; |
1da177e4 LT |
501 | |
502 | /* | |
503 | * We want the common case to go fast, which | |
504 | * is why we may in certain cases get here from | |
505 | * kernel mode. Just return without doing anything | |
506 | * if so. | |
507 | */ | |
508 | if (!user_mode(regs)) | |
a4858d4d | 509 | return; |
1da177e4 | 510 | |
a4858d4d JN |
511 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
512 | oldset = ¤t->saved_sigmask; | |
513 | else | |
1da177e4 LT |
514 | oldset = ¤t->blocked; |
515 | ||
516 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
517 | if (signr > 0) { | |
518 | /* Whee! Actually deliver the signal. */ | |
a4858d4d JN |
519 | if (handle_signal(canrestart, signr, &info, &ka, |
520 | oldset, regs)) { | |
521 | /* a signal was successfully delivered; the saved | |
522 | * sigmask will have been stored in the signal frame, | |
523 | * and will be restored by sigreturn, so we can simply | |
524 | * clear the TIF_RESTORE_SIGMASK flag */ | |
525 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
526 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
527 | } | |
528 | return; | |
1da177e4 LT |
529 | } |
530 | ||
531 | /* Did we come from a system call? */ | |
532 | if (canrestart) { | |
533 | /* Restart the system call - no handlers present */ | |
534 | if (regs->r10 == -ERESTARTNOHAND || | |
535 | regs->r10 == -ERESTARTSYS || | |
536 | regs->r10 == -ERESTARTNOINTR) { | |
537 | RESTART_CRIS_SYS(regs); | |
538 | } | |
a4858d4d | 539 | if (regs->r10 == -ERESTART_RESTARTBLOCK) { |
1da177e4 LT |
540 | regs->r10 = __NR_restart_syscall; |
541 | regs->irp -= 2; | |
542 | } | |
543 | } | |
a4858d4d JN |
544 | |
545 | /* if there's no signal to deliver, we just put the saved sigmask | |
546 | * back */ | |
547 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
548 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
549 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
550 | } | |
1da177e4 | 551 | } |