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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 | * | |
10 | * Copyright (C) 2000, 2001 Axis Communications AB | |
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> | |
19 | #include <linux/smp_lock.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/signal.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/wait.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/unistd.h> | |
26 | #include <linux/stddef.h> | |
27 | ||
28 | #include <asm/processor.h> | |
29 | #include <asm/ucontext.h> | |
30 | #include <asm/uaccess.h> | |
31 | ||
32 | #define DEBUG_SIG 0 | |
33 | ||
34 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
35 | ||
36 | /* a syscall in Linux/CRIS is a break 13 instruction which is 2 bytes */ | |
37 | /* manipulate regs so that upon return, it will be re-executed */ | |
38 | ||
39 | /* We rely on that pc points to the instruction after "break 13", so the | |
40 | * library must never do strange things like putting it in a delay slot. | |
41 | */ | |
42 | #define RESTART_CRIS_SYS(regs) regs->r10 = regs->orig_r10; regs->irp -= 2; | |
43 | ||
44 | int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs); | |
45 | ||
46 | /* | |
47 | * Atomically swap in the new signal mask, and wait for a signal. Define | |
48 | * dummy arguments to be able to reach the regs argument. (Note that this | |
49 | * arrangement relies on old_sigset_t occupying one register.) | |
50 | */ | |
51 | int | |
52 | sys_sigsuspend(old_sigset_t mask, long r11, long r12, long r13, long mof, | |
53 | long srp, struct pt_regs *regs) | |
54 | { | |
55 | sigset_t saveset; | |
56 | ||
57 | mask &= _BLOCKABLE; | |
58 | spin_lock_irq(¤t->sighand->siglock); | |
59 | saveset = current->blocked; | |
60 | siginitset(¤t->blocked, mask); | |
61 | recalc_sigpending(); | |
62 | spin_unlock_irq(¤t->sighand->siglock); | |
63 | ||
64 | regs->r10 = -EINTR; | |
65 | while (1) { | |
66 | current->state = TASK_INTERRUPTIBLE; | |
67 | schedule(); | |
68 | if (do_signal(0, &saveset, regs)) | |
69 | /* We will get here twice: once to call the signal | |
70 | handler, then again to return from the | |
71 | sigsuspend system call. When calling the | |
72 | signal handler, R10 holds the signal number as | |
73 | set through do_signal. The sigsuspend call | |
74 | will return with the restored value set above; | |
75 | always -EINTR. */ | |
76 | return regs->r10; | |
77 | } | |
78 | } | |
79 | ||
80 | /* Define dummy arguments to be able to reach the regs argument. (Note that | |
81 | * this arrangement relies on size_t occupying one register.) | |
82 | */ | |
83 | int | |
84 | sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, long r12, long r13, | |
85 | long mof, long srp, struct pt_regs *regs) | |
86 | { | |
87 | sigset_t saveset, newset; | |
88 | ||
89 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
90 | if (sigsetsize != sizeof(sigset_t)) | |
91 | return -EINVAL; | |
92 | ||
93 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
94 | return -EFAULT; | |
95 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
96 | ||
97 | spin_lock_irq(¤t->sighand->siglock); | |
98 | saveset = current->blocked; | |
99 | current->blocked = newset; | |
100 | recalc_sigpending(); | |
101 | spin_unlock_irq(¤t->sighand->siglock); | |
102 | ||
103 | regs->r10 = -EINTR; | |
104 | while (1) { | |
105 | current->state = TASK_INTERRUPTIBLE; | |
106 | schedule(); | |
107 | if (do_signal(0, &saveset, regs)) | |
108 | /* We will get here twice: once to call the signal | |
109 | handler, then again to return from the | |
110 | sigsuspend system call. When calling the | |
111 | signal handler, R10 holds the signal number as | |
112 | set through do_signal. The sigsuspend call | |
113 | will return with the restored value set above; | |
114 | always -EINTR. */ | |
115 | return regs->r10; | |
116 | } | |
117 | } | |
118 | ||
119 | int | |
120 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
121 | struct old_sigaction *oact) | |
122 | { | |
123 | struct k_sigaction new_ka, old_ka; | |
124 | int ret; | |
125 | ||
126 | if (act) { | |
127 | old_sigset_t mask; | |
128 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
129 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
130 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
131 | return -EFAULT; | |
132 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
133 | __get_user(mask, &act->sa_mask); | |
134 | siginitset(&new_ka.sa.sa_mask, mask); | |
135 | } | |
136 | ||
137 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
138 | ||
139 | if (!ret && oact) { | |
140 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
141 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
142 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
143 | return -EFAULT; | |
144 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
145 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
146 | } | |
147 | ||
148 | return ret; | |
149 | } | |
150 | ||
151 | int | |
152 | sys_sigaltstack(const stack_t *uss, stack_t __user *uoss) | |
153 | { | |
154 | return do_sigaltstack(uss, uoss, rdusp()); | |
155 | } | |
156 | ||
157 | ||
158 | /* | |
159 | * Do a signal return; undo the signal stack. | |
160 | */ | |
161 | ||
162 | struct sigframe { | |
163 | struct sigcontext sc; | |
164 | unsigned long extramask[_NSIG_WORDS-1]; | |
165 | unsigned char retcode[8]; /* trampoline code */ | |
166 | }; | |
167 | ||
168 | struct rt_sigframe { | |
169 | struct siginfo *pinfo; | |
170 | void *puc; | |
171 | struct siginfo info; | |
172 | struct ucontext uc; | |
173 | unsigned char retcode[8]; /* trampoline code */ | |
174 | }; | |
175 | ||
176 | ||
177 | static int | |
178 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) | |
179 | { | |
180 | unsigned int err = 0; | |
181 | unsigned long old_usp; | |
182 | ||
183 | /* Always make any pending restarted system calls return -EINTR */ | |
184 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
185 | ||
186 | /* restore the regs from &sc->regs (same as sc, since regs is first) | |
187 | * (sc is already checked for VERIFY_READ since the sigframe was | |
188 | * checked in sys_sigreturn previously) | |
189 | */ | |
190 | ||
191 | if (__copy_from_user(regs, sc, sizeof(struct pt_regs))) | |
192 | goto badframe; | |
193 | ||
194 | /* make sure the U-flag is set so user-mode cannot fool us */ | |
195 | ||
196 | regs->dccr |= 1 << 8; | |
197 | ||
198 | /* restore the old USP as it was before we stacked the sc etc. | |
199 | * (we cannot just pop the sigcontext since we aligned the sp and | |
200 | * stuff after pushing it) | |
201 | */ | |
202 | ||
203 | err |= __get_user(old_usp, &sc->usp); | |
204 | ||
205 | wrusp(old_usp); | |
206 | ||
207 | /* TODO: the other ports use regs->orig_XX to disable syscall checks | |
208 | * after this completes, but we don't use that mechanism. maybe we can | |
209 | * use it now ? | |
210 | */ | |
211 | ||
212 | return err; | |
213 | ||
214 | badframe: | |
215 | return 1; | |
216 | } | |
217 | ||
218 | /* Define dummy arguments to be able to reach the regs argument. */ | |
219 | ||
220 | asmlinkage int sys_sigreturn(long r10, long r11, long r12, long r13, long mof, | |
221 | long srp, struct pt_regs *regs) | |
222 | { | |
223 | struct sigframe __user *frame = (struct sigframe *)rdusp(); | |
224 | sigset_t set; | |
225 | ||
226 | /* | |
227 | * Since we stacked the signal on a dword boundary, | |
228 | * then frame should be dword aligned here. If it's | |
229 | * not, then the user is trying to mess with us. | |
230 | */ | |
231 | if (((long)frame) & 3) | |
232 | goto badframe; | |
233 | ||
234 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
235 | goto badframe; | |
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 | spin_lock_irq(¤t->sighand->siglock); | |
244 | current->blocked = set; | |
245 | recalc_sigpending(); | |
246 | spin_unlock_irq(¤t->sighand->siglock); | |
247 | ||
248 | if (restore_sigcontext(regs, &frame->sc)) | |
249 | goto badframe; | |
250 | ||
251 | /* TODO: SIGTRAP when single-stepping as in arm ? */ | |
252 | ||
253 | return regs->r10; | |
254 | ||
255 | badframe: | |
256 | force_sig(SIGSEGV, current); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* Define dummy arguments to be able to reach the regs argument. */ | |
261 | ||
262 | asmlinkage int sys_rt_sigreturn(long r10, long r11, long r12, long r13, | |
263 | long mof, long srp, struct pt_regs *regs) | |
264 | { | |
265 | struct rt_sigframe __user *frame = (struct rt_sigframe *)rdusp(); | |
266 | sigset_t set; | |
267 | ||
268 | /* | |
269 | * Since we stacked the signal on a dword boundary, | |
270 | * then frame should be dword aligned here. If it's | |
271 | * not, then the user is trying to mess with us. | |
272 | */ | |
273 | if (((long)frame) & 3) | |
274 | goto badframe; | |
275 | ||
276 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
277 | goto badframe; | |
278 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
279 | goto badframe; | |
280 | ||
281 | sigdelsetmask(&set, ~_BLOCKABLE); | |
282 | spin_lock_irq(¤t->sighand->siglock); | |
283 | current->blocked = set; | |
284 | recalc_sigpending(); | |
285 | spin_unlock_irq(¤t->sighand->siglock); | |
286 | ||
287 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) | |
288 | goto badframe; | |
289 | ||
290 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, rdusp()) == -EFAULT) | |
291 | goto badframe; | |
292 | ||
293 | return regs->r10; | |
294 | ||
295 | badframe: | |
296 | force_sig(SIGSEGV, current); | |
297 | return 0; | |
298 | } | |
299 | ||
300 | /* | |
301 | * Set up a signal frame. | |
302 | */ | |
303 | ||
304 | static int | |
305 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask) | |
306 | { | |
307 | int err = 0; | |
308 | unsigned long usp = rdusp(); | |
309 | ||
310 | /* copy the regs. they are first in sc so we can use sc directly */ | |
311 | ||
312 | err |= __copy_to_user(sc, regs, sizeof(struct pt_regs)); | |
313 | ||
314 | /* Set the frametype to CRIS_FRAME_NORMAL for the execution of | |
315 | the signal handler. The frametype will be restored to its previous | |
316 | value in restore_sigcontext. */ | |
317 | regs->frametype = CRIS_FRAME_NORMAL; | |
318 | ||
319 | /* then some other stuff */ | |
320 | ||
321 | err |= __put_user(mask, &sc->oldmask); | |
322 | ||
323 | err |= __put_user(usp, &sc->usp); | |
324 | ||
325 | return err; | |
326 | } | |
327 | ||
328 | /* figure out where we want to put the new signal frame - usually on the stack */ | |
329 | ||
330 | static inline void __user * | |
331 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
332 | { | |
333 | unsigned long sp = rdusp(); | |
334 | ||
335 | /* This is the X/Open sanctioned signal stack switching. */ | |
336 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
337 | if (! on_sig_stack(sp)) | |
338 | sp = current->sas_ss_sp + current->sas_ss_size; | |
339 | } | |
340 | ||
341 | /* make sure the frame is dword-aligned */ | |
342 | ||
343 | sp &= ~3; | |
344 | ||
345 | return (void __user*)(sp - frame_size); | |
346 | } | |
347 | ||
348 | /* grab and setup a signal frame. | |
349 | * | |
350 | * basically we stack a lot of state info, and arrange for the | |
351 | * user-mode program to return to the kernel using either a | |
352 | * trampoline which performs the syscall sigreturn, or a provided | |
353 | * user-mode trampoline. | |
354 | */ | |
355 | ||
356 | static void setup_frame(int sig, struct k_sigaction *ka, | |
357 | sigset_t *set, struct pt_regs * regs) | |
358 | { | |
359 | struct sigframe __user *frame; | |
360 | unsigned long return_ip; | |
361 | int err = 0; | |
362 | ||
363 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
364 | ||
365 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
366 | goto give_sigsegv; | |
367 | ||
368 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); | |
369 | if (err) | |
370 | goto give_sigsegv; | |
371 | ||
372 | if (_NSIG_WORDS > 1) { | |
373 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
374 | sizeof(frame->extramask)); | |
375 | } | |
376 | if (err) | |
377 | goto give_sigsegv; | |
378 | ||
379 | /* Set up to return from userspace. If provided, use a stub | |
380 | already in userspace. */ | |
381 | if (ka->sa.sa_flags & SA_RESTORER) { | |
382 | return_ip = (unsigned long)ka->sa.sa_restorer; | |
383 | } else { | |
384 | /* trampoline - the desired return ip is the retcode itself */ | |
385 | return_ip = (unsigned long)&frame->retcode; | |
386 | /* This is movu.w __NR_sigreturn, r9; break 13; */ | |
387 | err |= __put_user(0x9c5f, (short __user*)(frame->retcode+0)); | |
388 | err |= __put_user(__NR_sigreturn, (short __user*)(frame->retcode+2)); | |
389 | err |= __put_user(0xe93d, (short __user*)(frame->retcode+4)); | |
390 | } | |
391 | ||
392 | if (err) | |
393 | goto give_sigsegv; | |
394 | ||
395 | /* Set up registers for signal handler */ | |
396 | ||
397 | regs->irp = (unsigned long) ka->sa.sa_handler; /* what we enter NOW */ | |
398 | regs->srp = return_ip; /* what we enter LATER */ | |
399 | regs->r10 = sig; /* first argument is signo */ | |
400 | ||
401 | /* actually move the usp to reflect the stacked frame */ | |
402 | ||
403 | wrusp((unsigned long)frame); | |
404 | ||
405 | return; | |
406 | ||
407 | give_sigsegv: | |
408 | force_sigsegv(sig, current); | |
409 | } | |
410 | ||
411 | static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
412 | sigset_t *set, struct pt_regs * regs) | |
413 | { | |
414 | struct rt_sigframe __user *frame; | |
415 | unsigned long return_ip; | |
416 | int err = 0; | |
417 | ||
418 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
419 | ||
420 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
421 | goto give_sigsegv; | |
422 | ||
423 | err |= __put_user(&frame->info, &frame->pinfo); | |
424 | err |= __put_user(&frame->uc, &frame->puc); | |
425 | err |= copy_siginfo_to_user(&frame->info, info); | |
426 | if (err) | |
427 | goto give_sigsegv; | |
428 | ||
429 | /* Clear all the bits of the ucontext we don't use. */ | |
430 | err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext)); | |
431 | ||
432 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); | |
433 | ||
434 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
435 | ||
436 | if (err) | |
437 | goto give_sigsegv; | |
438 | ||
439 | /* Set up to return from userspace. If provided, use a stub | |
440 | already in userspace. */ | |
441 | if (ka->sa.sa_flags & SA_RESTORER) { | |
442 | return_ip = (unsigned long)ka->sa.sa_restorer; | |
443 | } else { | |
444 | /* trampoline - the desired return ip is the retcode itself */ | |
445 | return_ip = (unsigned long)&frame->retcode; | |
446 | /* This is movu.w __NR_rt_sigreturn, r9; break 13; */ | |
447 | err |= __put_user(0x9c5f, (short __user*)(frame->retcode+0)); | |
448 | err |= __put_user(__NR_rt_sigreturn, (short __user*)(frame->retcode+2)); | |
449 | err |= __put_user(0xe93d, (short __user*)(frame->retcode+4)); | |
450 | } | |
451 | ||
452 | if (err) | |
453 | goto give_sigsegv; | |
454 | ||
455 | /* TODO what is the current->exec_domain stuff and invmap ? */ | |
456 | ||
457 | /* Set up registers for signal handler */ | |
458 | ||
459 | regs->irp = (unsigned long) ka->sa.sa_handler; /* what we enter NOW */ | |
460 | regs->srp = return_ip; /* what we enter LATER */ | |
461 | regs->r10 = sig; /* first argument is signo */ | |
462 | regs->r11 = (unsigned long) &frame->info; /* second argument is (siginfo_t *) */ | |
463 | regs->r12 = 0; /* third argument is unused */ | |
464 | ||
465 | /* actually move the usp to reflect the stacked frame */ | |
466 | ||
467 | wrusp((unsigned long)frame); | |
468 | ||
469 | return; | |
470 | ||
471 | give_sigsegv: | |
472 | force_sigsegv(sig, current); | |
473 | } | |
474 | ||
475 | /* | |
476 | * OK, we're invoking a handler | |
477 | */ | |
478 | ||
d9b5444e | 479 | static inline void |
1da177e4 LT |
480 | handle_signal(int canrestart, unsigned long sig, |
481 | siginfo_t *info, struct k_sigaction *ka, | |
482 | sigset_t *oldset, struct pt_regs * regs) | |
483 | { | |
484 | /* Are we from a system call? */ | |
485 | if (canrestart) { | |
486 | /* If so, check system call restarting.. */ | |
487 | switch (regs->r10) { | |
488 | case -ERESTART_RESTARTBLOCK: | |
489 | case -ERESTARTNOHAND: | |
490 | /* ERESTARTNOHAND means that the syscall should only be | |
491 | restarted if there was no handler for the signal, and since | |
492 | we only get here if there is a handler, we don't restart */ | |
493 | regs->r10 = -EINTR; | |
494 | break; | |
495 | ||
496 | case -ERESTARTSYS: | |
497 | /* ERESTARTSYS means to restart the syscall if there is no | |
498 | handler or the handler was registered with SA_RESTART */ | |
499 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
500 | regs->r10 = -EINTR; | |
501 | break; | |
502 | } | |
503 | /* fallthrough */ | |
504 | case -ERESTARTNOINTR: | |
505 | /* ERESTARTNOINTR means that the syscall should be called again | |
506 | after the signal handler returns. */ | |
507 | RESTART_CRIS_SYS(regs); | |
508 | } | |
509 | } | |
510 | ||
511 | /* Set up the stack frame */ | |
512 | if (ka->sa.sa_flags & SA_SIGINFO) | |
513 | setup_rt_frame(sig, ka, info, oldset, regs); | |
514 | else | |
515 | setup_frame(sig, ka, oldset, regs); | |
516 | ||
517 | if (ka->sa.sa_flags & SA_ONESHOT) | |
518 | ka->sa.sa_handler = SIG_DFL; | |
519 | ||
69be8f18 SR |
520 | spin_lock_irq(¤t->sighand->siglock); |
521 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
522 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 523 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
524 | recalc_sigpending(); |
525 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
526 | } |
527 | ||
528 | /* | |
529 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
530 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
531 | * mistake. | |
532 | * | |
533 | * Also note that the regs structure given here as an argument, is the latest | |
534 | * pushed pt_regs. It may or may not be the same as the first pushed registers | |
535 | * when the initial usermode->kernelmode transition took place. Therefore | |
536 | * we can use user_mode(regs) to see if we came directly from kernel or user | |
537 | * mode below. | |
538 | */ | |
539 | ||
540 | int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs) | |
541 | { | |
542 | siginfo_t info; | |
543 | int signr; | |
544 | struct k_sigaction ka; | |
545 | ||
546 | /* | |
547 | * We want the common case to go fast, which | |
548 | * is why we may in certain cases get here from | |
549 | * kernel mode. Just return without doing anything | |
550 | * if so. | |
551 | */ | |
552 | if (!user_mode(regs)) | |
553 | return 1; | |
554 | ||
555 | if (!oldset) | |
556 | oldset = ¤t->blocked; | |
557 | ||
558 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
559 | if (signr > 0) { | |
560 | /* Whee! Actually deliver the signal. */ | |
561 | handle_signal(canrestart, signr, &info, &ka, oldset, regs); | |
562 | return 1; | |
563 | } | |
564 | ||
565 | /* Did we come from a system call? */ | |
566 | if (canrestart) { | |
567 | /* Restart the system call - no handlers present */ | |
568 | if (regs->r10 == -ERESTARTNOHAND || | |
569 | regs->r10 == -ERESTARTSYS || | |
570 | regs->r10 == -ERESTARTNOINTR) { | |
571 | RESTART_CRIS_SYS(regs); | |
572 | } | |
573 | if (regs->r10 == -ERESTART_RESTARTBLOCK){ | |
574 | regs->r10 = __NR_restart_syscall; | |
575 | regs->irp -= 2; | |
576 | } | |
577 | } | |
578 | return 0; | |
579 | } |