Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/signal.c | |
3 | * | |
54dfe5dd | 4 | * Copyright (C) IBM Corp. 1999,2006 |
1da177e4 LT |
5 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
6 | * | |
7 | * Based on Intel version | |
8 | * | |
9 | * Copyright (C) 1991, 1992 Linus Torvalds | |
10 | * | |
11 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
12 | */ | |
13 | ||
1da177e4 LT |
14 | #include <linux/sched.h> |
15 | #include <linux/mm.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/signal.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/stddef.h> | |
25 | #include <linux/tty.h> | |
26 | #include <linux/personality.h> | |
27 | #include <linux/binfmts.h> | |
28 | #include <asm/ucontext.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/lowcore.h> | |
31 | ||
32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
33 | ||
34 | ||
35 | typedef struct | |
36 | { | |
37 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
38 | struct sigcontext sc; | |
39 | _sigregs sregs; | |
40 | int signo; | |
41 | __u8 retcode[S390_SYSCALL_SIZE]; | |
42 | } sigframe; | |
43 | ||
44 | typedef struct | |
45 | { | |
46 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
47 | __u8 retcode[S390_SYSCALL_SIZE]; | |
48 | struct siginfo info; | |
49 | struct ucontext uc; | |
50 | } rt_sigframe; | |
51 | ||
1da177e4 LT |
52 | /* |
53 | * Atomically swap in the new signal mask, and wait for a signal. | |
54 | */ | |
55 | asmlinkage int | |
54dfe5dd | 56 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) |
1da177e4 | 57 | { |
1da177e4 LT |
58 | mask &= _BLOCKABLE; |
59 | spin_lock_irq(¤t->sighand->siglock); | |
54dfe5dd | 60 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
61 | siginitset(¤t->blocked, mask); |
62 | recalc_sigpending(); | |
63 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 | 64 | |
54dfe5dd HC |
65 | current->state = TASK_INTERRUPTIBLE; |
66 | schedule(); | |
67 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 | 68 | |
54dfe5dd | 69 | return -ERESTARTNOHAND; |
1da177e4 LT |
70 | } |
71 | ||
72 | asmlinkage long | |
73 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
74 | struct old_sigaction __user *oact) | |
75 | { | |
76 | struct k_sigaction new_ka, old_ka; | |
77 | int ret; | |
78 | ||
79 | if (act) { | |
80 | old_sigset_t mask; | |
81 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
82 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
12bae235 HC |
83 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
84 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
85 | __get_user(mask, &act->sa_mask)) | |
1da177e4 | 86 | return -EFAULT; |
1da177e4 LT |
87 | siginitset(&new_ka.sa.sa_mask, mask); |
88 | } | |
89 | ||
90 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
91 | ||
92 | if (!ret && oact) { | |
93 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
94 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
12bae235 HC |
95 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
96 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
97 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
1da177e4 | 98 | return -EFAULT; |
1da177e4 LT |
99 | } |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
104 | asmlinkage long | |
105 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
106 | struct pt_regs *regs) | |
107 | { | |
108 | return do_sigaltstack(uss, uoss, regs->gprs[15]); | |
109 | } | |
110 | ||
111 | ||
112 | ||
113 | /* Returns non-zero on fault. */ | |
114 | static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
115 | { | |
6837a8c3 GS |
116 | _sigregs user_sregs; |
117 | ||
1da177e4 LT |
118 | save_access_regs(current->thread.acrs); |
119 | ||
120 | /* Copy a 'clean' PSW mask to the user to avoid leaking | |
121 | information about whether PER is currently on. */ | |
c1821c2e | 122 | user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask); |
b05e3703 MS |
123 | user_sregs.regs.psw.addr = regs->psw.addr; |
124 | memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
125 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
126 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
127 | /* |
128 | * We have to store the fp registers to current->thread.fp_regs | |
129 | * to merge them with the emulated registers. | |
130 | */ | |
131 | save_fp_regs(¤t->thread.fp_regs); | |
6837a8c3 GS |
132 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
133 | sizeof(s390_fp_regs)); | |
134 | return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); | |
1da177e4 LT |
135 | } |
136 | ||
137 | /* Returns positive number on error */ | |
138 | static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
139 | { | |
1da177e4 | 140 | int err; |
6837a8c3 | 141 | _sigregs user_sregs; |
1da177e4 LT |
142 | |
143 | /* Alwys make any pending restarted system call return -EINTR */ | |
144 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
145 | ||
6837a8c3 | 146 | err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); |
1da177e4 LT |
147 | if (err) |
148 | return err; | |
b05e3703 MS |
149 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, |
150 | user_sregs.regs.psw.mask); | |
151 | regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr; | |
152 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
153 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
154 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
155 | restore_access_regs(current->thread.acrs); |
156 | ||
6837a8c3 GS |
157 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
158 | sizeof(s390_fp_regs)); | |
1da177e4 | 159 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
1da177e4 LT |
160 | |
161 | restore_fp_regs(¤t->thread.fp_regs); | |
162 | regs->trap = -1; /* disable syscall checks */ | |
163 | return 0; | |
164 | } | |
165 | ||
166 | asmlinkage long sys_sigreturn(struct pt_regs *regs) | |
167 | { | |
168 | sigframe __user *frame = (sigframe __user *)regs->gprs[15]; | |
169 | sigset_t set; | |
170 | ||
171 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
172 | goto badframe; | |
173 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) | |
174 | goto badframe; | |
175 | ||
176 | sigdelsetmask(&set, ~_BLOCKABLE); | |
177 | spin_lock_irq(¤t->sighand->siglock); | |
178 | current->blocked = set; | |
179 | recalc_sigpending(); | |
180 | spin_unlock_irq(¤t->sighand->siglock); | |
181 | ||
182 | if (restore_sigregs(regs, &frame->sregs)) | |
183 | goto badframe; | |
184 | ||
185 | return regs->gprs[2]; | |
186 | ||
187 | badframe: | |
188 | force_sig(SIGSEGV, current); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) | |
193 | { | |
194 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; | |
195 | sigset_t set; | |
196 | ||
197 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
198 | goto badframe; | |
199 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) | |
200 | goto badframe; | |
201 | ||
202 | sigdelsetmask(&set, ~_BLOCKABLE); | |
203 | spin_lock_irq(¤t->sighand->siglock); | |
204 | current->blocked = set; | |
205 | recalc_sigpending(); | |
206 | spin_unlock_irq(¤t->sighand->siglock); | |
207 | ||
208 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) | |
209 | goto badframe; | |
210 | ||
4e3df37e CLG |
211 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
212 | regs->gprs[15]) == -EFAULT) | |
213 | goto badframe; | |
1da177e4 LT |
214 | return regs->gprs[2]; |
215 | ||
216 | badframe: | |
217 | force_sig(SIGSEGV, current); | |
218 | return 0; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Set up a signal frame. | |
223 | */ | |
224 | ||
225 | ||
226 | /* | |
227 | * Determine which stack to use.. | |
228 | */ | |
229 | static inline void __user * | |
230 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
231 | { | |
232 | unsigned long sp; | |
233 | ||
234 | /* Default to using normal stack */ | |
235 | sp = regs->gprs[15]; | |
236 | ||
237 | /* This is the X/Open sanctioned signal stack switching. */ | |
238 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
239 | if (! sas_ss_flags(sp)) | |
240 | sp = current->sas_ss_sp + current->sas_ss_size; | |
241 | } | |
242 | ||
243 | /* This is the legacy signal stack switching. */ | |
244 | else if (!user_mode(regs) && | |
245 | !(ka->sa.sa_flags & SA_RESTORER) && | |
246 | ka->sa.sa_restorer) { | |
247 | sp = (unsigned long) ka->sa.sa_restorer; | |
248 | } | |
249 | ||
250 | return (void __user *)((sp - frame_size) & -8ul); | |
251 | } | |
252 | ||
253 | static inline int map_signal(int sig) | |
254 | { | |
255 | if (current_thread_info()->exec_domain | |
256 | && current_thread_info()->exec_domain->signal_invmap | |
257 | && sig < 32) | |
258 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
259 | else | |
260 | return sig; | |
261 | } | |
262 | ||
54dfe5dd HC |
263 | static int setup_frame(int sig, struct k_sigaction *ka, |
264 | sigset_t *set, struct pt_regs * regs) | |
1da177e4 LT |
265 | { |
266 | sigframe __user *frame; | |
267 | ||
268 | frame = get_sigframe(ka, regs, sizeof(sigframe)); | |
269 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) | |
270 | goto give_sigsegv; | |
271 | ||
272 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) | |
273 | goto give_sigsegv; | |
274 | ||
275 | if (save_sigregs(regs, &frame->sregs)) | |
276 | goto give_sigsegv; | |
277 | if (__put_user(&frame->sregs, &frame->sc.sregs)) | |
278 | goto give_sigsegv; | |
279 | ||
280 | /* Set up to return from userspace. If provided, use a stub | |
281 | already in userspace. */ | |
282 | if (ka->sa.sa_flags & SA_RESTORER) { | |
283 | regs->gprs[14] = (unsigned long) | |
284 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
285 | } else { | |
286 | regs->gprs[14] = (unsigned long) | |
287 | frame->retcode | PSW_ADDR_AMODE; | |
288 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
289 | (u16 __user *)(frame->retcode))) | |
290 | goto give_sigsegv; | |
291 | } | |
292 | ||
293 | /* Set up backchain. */ | |
294 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
295 | goto give_sigsegv; | |
296 | ||
297 | /* Set up registers for signal handler */ | |
298 | regs->gprs[15] = (unsigned long) frame; | |
299 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
300 | ||
301 | regs->gprs[2] = map_signal(sig); | |
302 | regs->gprs[3] = (unsigned long) &frame->sc; | |
303 | ||
304 | /* We forgot to include these in the sigcontext. | |
305 | To avoid breaking binary compatibility, they are passed as args. */ | |
306 | regs->gprs[4] = current->thread.trap_no; | |
307 | regs->gprs[5] = current->thread.prot_addr; | |
308 | ||
309 | /* Place signal number on stack to allow backtrace from handler. */ | |
310 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
311 | goto give_sigsegv; | |
54dfe5dd | 312 | return 0; |
1da177e4 LT |
313 | |
314 | give_sigsegv: | |
315 | force_sigsegv(sig, current); | |
54dfe5dd | 316 | return -EFAULT; |
1da177e4 LT |
317 | } |
318 | ||
54dfe5dd | 319 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
320 | sigset_t *set, struct pt_regs * regs) |
321 | { | |
322 | int err = 0; | |
323 | rt_sigframe __user *frame; | |
324 | ||
325 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); | |
326 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) | |
327 | goto give_sigsegv; | |
328 | ||
329 | if (copy_siginfo_to_user(&frame->info, info)) | |
330 | goto give_sigsegv; | |
331 | ||
332 | /* Create the ucontext. */ | |
333 | err |= __put_user(0, &frame->uc.uc_flags); | |
c2814476 AV |
334 | err |= __put_user(NULL, &frame->uc.uc_link); |
335 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
1da177e4 LT |
336 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
337 | &frame->uc.uc_stack.ss_flags); | |
338 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
339 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); | |
340 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
341 | if (err) | |
342 | goto give_sigsegv; | |
343 | ||
344 | /* Set up to return from userspace. If provided, use a stub | |
345 | already in userspace. */ | |
346 | if (ka->sa.sa_flags & SA_RESTORER) { | |
347 | regs->gprs[14] = (unsigned long) | |
348 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
349 | } else { | |
350 | regs->gprs[14] = (unsigned long) | |
351 | frame->retcode | PSW_ADDR_AMODE; | |
b44df334 HC |
352 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
353 | (u16 __user *)(frame->retcode))) | |
354 | goto give_sigsegv; | |
1da177e4 LT |
355 | } |
356 | ||
357 | /* Set up backchain. */ | |
358 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
359 | goto give_sigsegv; | |
360 | ||
361 | /* Set up registers for signal handler */ | |
362 | regs->gprs[15] = (unsigned long) frame; | |
363 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
364 | ||
365 | regs->gprs[2] = map_signal(sig); | |
366 | regs->gprs[3] = (unsigned long) &frame->info; | |
367 | regs->gprs[4] = (unsigned long) &frame->uc; | |
54dfe5dd | 368 | return 0; |
1da177e4 LT |
369 | |
370 | give_sigsegv: | |
371 | force_sigsegv(sig, current); | |
54dfe5dd | 372 | return -EFAULT; |
1da177e4 LT |
373 | } |
374 | ||
375 | /* | |
376 | * OK, we're invoking a handler | |
377 | */ | |
378 | ||
54dfe5dd | 379 | static int |
1da177e4 LT |
380 | handle_signal(unsigned long sig, struct k_sigaction *ka, |
381 | siginfo_t *info, sigset_t *oldset, struct pt_regs * regs) | |
382 | { | |
54dfe5dd HC |
383 | int ret; |
384 | ||
1da177e4 LT |
385 | /* Set up the stack frame */ |
386 | if (ka->sa.sa_flags & SA_SIGINFO) | |
54dfe5dd | 387 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 388 | else |
54dfe5dd HC |
389 | ret = setup_frame(sig, ka, oldset, regs); |
390 | ||
391 | if (ret == 0) { | |
392 | spin_lock_irq(¤t->sighand->siglock); | |
393 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
394 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
395 | sigaddset(¤t->blocked,sig); | |
396 | recalc_sigpending(); | |
397 | spin_unlock_irq(¤t->sighand->siglock); | |
398 | } | |
1da177e4 | 399 | |
54dfe5dd | 400 | return ret; |
1da177e4 LT |
401 | } |
402 | ||
403 | /* | |
404 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
405 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
406 | * mistake. | |
407 | * | |
408 | * Note that we go through the signals twice: once to check the signals that | |
409 | * the kernel can handle, and then we build all the user-level signal handling | |
410 | * stack-frames in one go after that. | |
411 | */ | |
54dfe5dd | 412 | void do_signal(struct pt_regs *regs) |
1da177e4 LT |
413 | { |
414 | unsigned long retval = 0, continue_addr = 0, restart_addr = 0; | |
415 | siginfo_t info; | |
416 | int signr; | |
417 | struct k_sigaction ka; | |
54dfe5dd | 418 | sigset_t *oldset; |
1da177e4 LT |
419 | |
420 | /* | |
421 | * We want the common case to go fast, which | |
422 | * is why we may in certain cases get here from | |
423 | * kernel mode. Just return without doing anything | |
424 | * if so. | |
425 | */ | |
426 | if (!user_mode(regs)) | |
54dfe5dd | 427 | return; |
1da177e4 | 428 | |
54dfe5dd HC |
429 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
430 | oldset = ¤t->saved_sigmask; | |
431 | else | |
1da177e4 LT |
432 | oldset = ¤t->blocked; |
433 | ||
434 | /* Are we from a system call? */ | |
435 | if (regs->trap == __LC_SVC_OLD_PSW) { | |
436 | continue_addr = regs->psw.addr; | |
437 | restart_addr = continue_addr - regs->ilc; | |
438 | retval = regs->gprs[2]; | |
439 | ||
440 | /* Prepare for system call restart. We do this here so that a | |
441 | debugger will see the already changed PSW. */ | |
54dfe5dd HC |
442 | switch (retval) { |
443 | case -ERESTARTNOHAND: | |
444 | case -ERESTARTSYS: | |
445 | case -ERESTARTNOINTR: | |
1da177e4 LT |
446 | regs->gprs[2] = regs->orig_gpr2; |
447 | regs->psw.addr = restart_addr; | |
54dfe5dd HC |
448 | break; |
449 | case -ERESTART_RESTARTBLOCK: | |
1da177e4 LT |
450 | regs->gprs[2] = -EINTR; |
451 | } | |
8427082a | 452 | regs->trap = -1; /* Don't deal with this again. */ |
1da177e4 LT |
453 | } |
454 | ||
455 | /* Get signal to deliver. When running under ptrace, at this point | |
456 | the debugger may change all our registers ... */ | |
457 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
458 | ||
459 | /* Depending on the signal settings we may need to revert the | |
460 | decision to restart the system call. */ | |
461 | if (signr > 0 && regs->psw.addr == restart_addr) { | |
462 | if (retval == -ERESTARTNOHAND | |
463 | || (retval == -ERESTARTSYS | |
464 | && !(current->sighand->action[signr-1].sa.sa_flags | |
465 | & SA_RESTART))) { | |
466 | regs->gprs[2] = -EINTR; | |
467 | regs->psw.addr = continue_addr; | |
468 | } | |
469 | } | |
470 | ||
471 | if (signr > 0) { | |
472 | /* Whee! Actually deliver the signal. */ | |
347a8dc3 | 473 | #ifdef CONFIG_COMPAT |
1da177e4 | 474 | if (test_thread_flag(TIF_31BIT)) { |
54dfe5dd HC |
475 | extern int handle_signal32(unsigned long sig, |
476 | struct k_sigaction *ka, | |
477 | siginfo_t *info, | |
478 | sigset_t *oldset, | |
479 | struct pt_regs *regs); | |
480 | if (handle_signal32( | |
481 | signr, &ka, &info, oldset, regs) == 0) { | |
482 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
483 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
484 | } | |
485 | return; | |
1da177e4 LT |
486 | } |
487 | #endif | |
54dfe5dd HC |
488 | if (handle_signal(signr, &ka, &info, oldset, regs) == 0) { |
489 | /* | |
490 | * A signal was successfully delivered; the saved | |
491 | * sigmask will have been stored in the signal frame, | |
492 | * and will be restored by sigreturn, so we can simply | |
493 | * clear the TIF_RESTORE_SIGMASK flag. | |
494 | */ | |
495 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
496 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
497 | } | |
498 | return; | |
499 | } | |
500 | ||
501 | /* | |
502 | * If there's no signal to deliver, we just put the saved sigmask back. | |
503 | */ | |
504 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
505 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
506 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1da177e4 LT |
507 | } |
508 | ||
509 | /* Restart a different system call. */ | |
510 | if (retval == -ERESTART_RESTARTBLOCK | |
511 | && regs->psw.addr == continue_addr) { | |
512 | regs->gprs[2] = __NR_restart_syscall; | |
513 | set_thread_flag(TIF_RESTART_SVC); | |
514 | } | |
1da177e4 | 515 | } |