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Commit | Line | Data |
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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> | |
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/signal.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/wait.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/tty.h> | |
25 | #include <linux/personality.h> | |
26 | #include <linux/binfmts.h> | |
753c4dd6 | 27 | #include <linux/tracehook.h> |
26689452 | 28 | #include <linux/syscalls.h> |
7757591a | 29 | #include <linux/compat.h> |
1da177e4 LT |
30 | #include <asm/ucontext.h> |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/lowcore.h> | |
a806170e | 33 | #include "entry.h" |
1da177e4 LT |
34 | |
35 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
36 | ||
37 | ||
38 | typedef struct | |
39 | { | |
40 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
41 | struct sigcontext sc; | |
42 | _sigregs sregs; | |
43 | int signo; | |
44 | __u8 retcode[S390_SYSCALL_SIZE]; | |
45 | } sigframe; | |
46 | ||
47 | typedef struct | |
48 | { | |
49 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
50 | __u8 retcode[S390_SYSCALL_SIZE]; | |
51 | struct siginfo info; | |
52 | struct ucontext uc; | |
53 | } rt_sigframe; | |
54 | ||
1da177e4 LT |
55 | /* |
56 | * Atomically swap in the new signal mask, and wait for a signal. | |
57 | */ | |
26689452 | 58 | SYSCALL_DEFINE3(sigsuspend, int, history0, int, history1, old_sigset_t, mask) |
1da177e4 | 59 | { |
391c62fe | 60 | sigset_t blocked; |
1da177e4 | 61 | |
391c62fe HC |
62 | current->saved_sigmask = current->blocked; |
63 | mask &= _BLOCKABLE; | |
64 | siginitset(&blocked, mask); | |
65 | set_current_blocked(&blocked); | |
0b4d7890 | 66 | set_current_state(TASK_INTERRUPTIBLE); |
54dfe5dd HC |
67 | schedule(); |
68 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
54dfe5dd | 69 | return -ERESTARTNOHAND; |
1da177e4 LT |
70 | } |
71 | ||
26689452 HC |
72 | SYSCALL_DEFINE3(sigaction, int, sig, const struct old_sigaction __user *, act, |
73 | struct old_sigaction __user *, oact) | |
1da177e4 LT |
74 | { |
75 | struct k_sigaction new_ka, old_ka; | |
76 | int ret; | |
77 | ||
78 | if (act) { | |
79 | old_sigset_t mask; | |
80 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
81 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
12bae235 HC |
82 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
83 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
84 | __get_user(mask, &act->sa_mask)) | |
1da177e4 | 85 | return -EFAULT; |
1da177e4 LT |
86 | siginitset(&new_ka.sa.sa_mask, mask); |
87 | } | |
88 | ||
89 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
90 | ||
91 | if (!ret && oact) { | |
92 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
93 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
12bae235 HC |
94 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
95 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
96 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
1da177e4 | 97 | return -EFAULT; |
1da177e4 LT |
98 | } |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
26689452 HC |
103 | SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss, |
104 | stack_t __user *, uoss) | |
1da177e4 | 105 | { |
03ff9a23 | 106 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
107 | return do_sigaltstack(uss, uoss, regs->gprs[15]); |
108 | } | |
109 | ||
1da177e4 LT |
110 | /* Returns non-zero on fault. */ |
111 | static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
112 | { | |
6837a8c3 GS |
113 | _sigregs user_sregs; |
114 | ||
1da177e4 LT |
115 | save_access_regs(current->thread.acrs); |
116 | ||
117 | /* Copy a 'clean' PSW mask to the user to avoid leaking | |
118 | information about whether PER is currently on. */ | |
c1821c2e | 119 | user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask); |
b05e3703 MS |
120 | user_sregs.regs.psw.addr = regs->psw.addr; |
121 | memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
122 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
123 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
124 | /* |
125 | * We have to store the fp registers to current->thread.fp_regs | |
126 | * to merge them with the emulated registers. | |
127 | */ | |
128 | save_fp_regs(¤t->thread.fp_regs); | |
6837a8c3 GS |
129 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
130 | sizeof(s390_fp_regs)); | |
131 | return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); | |
1da177e4 LT |
132 | } |
133 | ||
134 | /* Returns positive number on error */ | |
135 | static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
136 | { | |
1da177e4 | 137 | int err; |
6837a8c3 | 138 | _sigregs user_sregs; |
1da177e4 LT |
139 | |
140 | /* Alwys make any pending restarted system call return -EINTR */ | |
141 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
142 | ||
6837a8c3 | 143 | err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); |
1da177e4 LT |
144 | if (err) |
145 | return err; | |
b05e3703 MS |
146 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, |
147 | user_sregs.regs.psw.mask); | |
148 | regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr; | |
149 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
150 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
151 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
152 | restore_access_regs(current->thread.acrs); |
153 | ||
6837a8c3 GS |
154 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
155 | sizeof(s390_fp_regs)); | |
1da177e4 | 156 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
1da177e4 LT |
157 | |
158 | restore_fp_regs(¤t->thread.fp_regs); | |
59da2139 | 159 | regs->svcnr = 0; /* disable syscall checks */ |
1da177e4 LT |
160 | return 0; |
161 | } | |
162 | ||
26689452 | 163 | SYSCALL_DEFINE0(sigreturn) |
1da177e4 | 164 | { |
03ff9a23 | 165 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
166 | sigframe __user *frame = (sigframe __user *)regs->gprs[15]; |
167 | sigset_t set; | |
168 | ||
169 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
170 | goto badframe; | |
171 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) | |
172 | goto badframe; | |
1da177e4 | 173 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 174 | set_current_blocked(&set); |
1da177e4 LT |
175 | if (restore_sigregs(regs, &frame->sregs)) |
176 | goto badframe; | |
1da177e4 | 177 | return regs->gprs[2]; |
1da177e4 LT |
178 | badframe: |
179 | force_sig(SIGSEGV, current); | |
180 | return 0; | |
181 | } | |
182 | ||
26689452 | 183 | SYSCALL_DEFINE0(rt_sigreturn) |
1da177e4 | 184 | { |
03ff9a23 | 185 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
186 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; |
187 | sigset_t set; | |
188 | ||
189 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
190 | goto badframe; | |
191 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) | |
192 | goto badframe; | |
1da177e4 | 193 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 194 | set_current_blocked(&set); |
1da177e4 LT |
195 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) |
196 | goto badframe; | |
4e3df37e CLG |
197 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
198 | regs->gprs[15]) == -EFAULT) | |
199 | goto badframe; | |
1da177e4 | 200 | return regs->gprs[2]; |
1da177e4 LT |
201 | badframe: |
202 | force_sig(SIGSEGV, current); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Set up a signal frame. | |
208 | */ | |
209 | ||
210 | ||
211 | /* | |
212 | * Determine which stack to use.. | |
213 | */ | |
214 | static inline void __user * | |
215 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
216 | { | |
217 | unsigned long sp; | |
218 | ||
219 | /* Default to using normal stack */ | |
220 | sp = regs->gprs[15]; | |
221 | ||
de553438 HC |
222 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
223 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) | |
224 | return (void __user *) -1UL; | |
225 | ||
1da177e4 LT |
226 | /* This is the X/Open sanctioned signal stack switching. */ |
227 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
228 | if (! sas_ss_flags(sp)) | |
229 | sp = current->sas_ss_sp + current->sas_ss_size; | |
230 | } | |
231 | ||
232 | /* This is the legacy signal stack switching. */ | |
233 | else if (!user_mode(regs) && | |
234 | !(ka->sa.sa_flags & SA_RESTORER) && | |
235 | ka->sa.sa_restorer) { | |
236 | sp = (unsigned long) ka->sa.sa_restorer; | |
237 | } | |
238 | ||
239 | return (void __user *)((sp - frame_size) & -8ul); | |
240 | } | |
241 | ||
242 | static inline int map_signal(int sig) | |
243 | { | |
244 | if (current_thread_info()->exec_domain | |
245 | && current_thread_info()->exec_domain->signal_invmap | |
246 | && sig < 32) | |
247 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
248 | else | |
249 | return sig; | |
250 | } | |
251 | ||
54dfe5dd HC |
252 | static int setup_frame(int sig, struct k_sigaction *ka, |
253 | sigset_t *set, struct pt_regs * regs) | |
1da177e4 LT |
254 | { |
255 | sigframe __user *frame; | |
256 | ||
257 | frame = get_sigframe(ka, regs, sizeof(sigframe)); | |
258 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) | |
259 | goto give_sigsegv; | |
260 | ||
de553438 HC |
261 | if (frame == (void __user *) -1UL) |
262 | goto give_sigsegv; | |
263 | ||
1da177e4 LT |
264 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) |
265 | goto give_sigsegv; | |
266 | ||
267 | if (save_sigregs(regs, &frame->sregs)) | |
268 | goto give_sigsegv; | |
269 | if (__put_user(&frame->sregs, &frame->sc.sregs)) | |
270 | goto give_sigsegv; | |
271 | ||
272 | /* Set up to return from userspace. If provided, use a stub | |
273 | already in userspace. */ | |
274 | if (ka->sa.sa_flags & SA_RESTORER) { | |
275 | regs->gprs[14] = (unsigned long) | |
276 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
277 | } else { | |
278 | regs->gprs[14] = (unsigned long) | |
279 | frame->retcode | PSW_ADDR_AMODE; | |
280 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
281 | (u16 __user *)(frame->retcode))) | |
282 | goto give_sigsegv; | |
283 | } | |
284 | ||
285 | /* Set up backchain. */ | |
286 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
287 | goto give_sigsegv; | |
288 | ||
289 | /* Set up registers for signal handler */ | |
290 | regs->gprs[15] = (unsigned long) frame; | |
291 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
292 | ||
293 | regs->gprs[2] = map_signal(sig); | |
294 | regs->gprs[3] = (unsigned long) &frame->sc; | |
295 | ||
296 | /* We forgot to include these in the sigcontext. | |
297 | To avoid breaking binary compatibility, they are passed as args. */ | |
298 | regs->gprs[4] = current->thread.trap_no; | |
299 | regs->gprs[5] = current->thread.prot_addr; | |
86f2552b | 300 | regs->gprs[6] = task_thread_info(current)->last_break; |
1da177e4 LT |
301 | |
302 | /* Place signal number on stack to allow backtrace from handler. */ | |
303 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
304 | goto give_sigsegv; | |
54dfe5dd | 305 | return 0; |
1da177e4 LT |
306 | |
307 | give_sigsegv: | |
308 | force_sigsegv(sig, current); | |
54dfe5dd | 309 | return -EFAULT; |
1da177e4 LT |
310 | } |
311 | ||
54dfe5dd | 312 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
313 | sigset_t *set, struct pt_regs * regs) |
314 | { | |
315 | int err = 0; | |
316 | rt_sigframe __user *frame; | |
317 | ||
318 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); | |
319 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) | |
320 | goto give_sigsegv; | |
321 | ||
de553438 HC |
322 | if (frame == (void __user *) -1UL) |
323 | goto give_sigsegv; | |
324 | ||
1da177e4 LT |
325 | if (copy_siginfo_to_user(&frame->info, info)) |
326 | goto give_sigsegv; | |
327 | ||
328 | /* Create the ucontext. */ | |
329 | err |= __put_user(0, &frame->uc.uc_flags); | |
c2814476 AV |
330 | err |= __put_user(NULL, &frame->uc.uc_link); |
331 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
1da177e4 LT |
332 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
333 | &frame->uc.uc_stack.ss_flags); | |
334 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
335 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); | |
336 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
337 | if (err) | |
338 | goto give_sigsegv; | |
339 | ||
340 | /* Set up to return from userspace. If provided, use a stub | |
341 | already in userspace. */ | |
342 | if (ka->sa.sa_flags & SA_RESTORER) { | |
343 | regs->gprs[14] = (unsigned long) | |
344 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
345 | } else { | |
346 | regs->gprs[14] = (unsigned long) | |
347 | frame->retcode | PSW_ADDR_AMODE; | |
b44df334 HC |
348 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
349 | (u16 __user *)(frame->retcode))) | |
350 | goto give_sigsegv; | |
1da177e4 LT |
351 | } |
352 | ||
353 | /* Set up backchain. */ | |
354 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
355 | goto give_sigsegv; | |
356 | ||
357 | /* Set up registers for signal handler */ | |
358 | regs->gprs[15] = (unsigned long) frame; | |
359 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
360 | ||
361 | regs->gprs[2] = map_signal(sig); | |
362 | regs->gprs[3] = (unsigned long) &frame->info; | |
363 | regs->gprs[4] = (unsigned long) &frame->uc; | |
86f2552b | 364 | regs->gprs[5] = task_thread_info(current)->last_break; |
54dfe5dd | 365 | return 0; |
1da177e4 LT |
366 | |
367 | give_sigsegv: | |
368 | force_sigsegv(sig, current); | |
54dfe5dd | 369 | return -EFAULT; |
1da177e4 LT |
370 | } |
371 | ||
391c62fe HC |
372 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
373 | siginfo_t *info, sigset_t *oldset, | |
374 | struct pt_regs *regs) | |
1da177e4 | 375 | { |
391c62fe | 376 | sigset_t blocked; |
54dfe5dd HC |
377 | int ret; |
378 | ||
1da177e4 LT |
379 | /* Set up the stack frame */ |
380 | if (ka->sa.sa_flags & SA_SIGINFO) | |
54dfe5dd | 381 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 382 | else |
54dfe5dd | 383 | ret = setup_frame(sig, ka, oldset, regs); |
391c62fe HC |
384 | if (ret) |
385 | return ret; | |
386 | sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); | |
387 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
388 | sigaddset(&blocked, sig); | |
389 | set_current_blocked(&blocked); | |
390 | return 0; | |
1da177e4 LT |
391 | } |
392 | ||
393 | /* | |
394 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
395 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
396 | * mistake. | |
397 | * | |
398 | * Note that we go through the signals twice: once to check the signals that | |
399 | * the kernel can handle, and then we build all the user-level signal handling | |
400 | * stack-frames in one go after that. | |
401 | */ | |
54dfe5dd | 402 | void do_signal(struct pt_regs *regs) |
1da177e4 LT |
403 | { |
404 | unsigned long retval = 0, continue_addr = 0, restart_addr = 0; | |
405 | siginfo_t info; | |
406 | int signr; | |
407 | struct k_sigaction ka; | |
54dfe5dd | 408 | sigset_t *oldset; |
1da177e4 LT |
409 | |
410 | /* | |
411 | * We want the common case to go fast, which | |
412 | * is why we may in certain cases get here from | |
413 | * kernel mode. Just return without doing anything | |
414 | * if so. | |
415 | */ | |
416 | if (!user_mode(regs)) | |
54dfe5dd | 417 | return; |
1da177e4 | 418 | |
54dfe5dd HC |
419 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
420 | oldset = ¤t->saved_sigmask; | |
421 | else | |
1da177e4 LT |
422 | oldset = ¤t->blocked; |
423 | ||
424 | /* Are we from a system call? */ | |
59da2139 | 425 | if (regs->svcnr) { |
1da177e4 LT |
426 | continue_addr = regs->psw.addr; |
427 | restart_addr = continue_addr - regs->ilc; | |
428 | retval = regs->gprs[2]; | |
429 | ||
430 | /* Prepare for system call restart. We do this here so that a | |
431 | debugger will see the already changed PSW. */ | |
54dfe5dd HC |
432 | switch (retval) { |
433 | case -ERESTARTNOHAND: | |
434 | case -ERESTARTSYS: | |
435 | case -ERESTARTNOINTR: | |
1da177e4 LT |
436 | regs->gprs[2] = regs->orig_gpr2; |
437 | regs->psw.addr = restart_addr; | |
54dfe5dd HC |
438 | break; |
439 | case -ERESTART_RESTARTBLOCK: | |
1da177e4 LT |
440 | regs->gprs[2] = -EINTR; |
441 | } | |
59da2139 | 442 | regs->svcnr = 0; /* Don't deal with this again. */ |
1da177e4 LT |
443 | } |
444 | ||
445 | /* Get signal to deliver. When running under ptrace, at this point | |
446 | the debugger may change all our registers ... */ | |
447 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
448 | ||
449 | /* Depending on the signal settings we may need to revert the | |
450 | decision to restart the system call. */ | |
451 | if (signr > 0 && regs->psw.addr == restart_addr) { | |
452 | if (retval == -ERESTARTNOHAND | |
453 | || (retval == -ERESTARTSYS | |
454 | && !(current->sighand->action[signr-1].sa.sa_flags | |
455 | & SA_RESTART))) { | |
456 | regs->gprs[2] = -EINTR; | |
457 | regs->psw.addr = continue_addr; | |
458 | } | |
459 | } | |
460 | ||
461 | if (signr > 0) { | |
462 | /* Whee! Actually deliver the signal. */ | |
0ac30be4 | 463 | int ret; |
347a8dc3 | 464 | #ifdef CONFIG_COMPAT |
7757591a | 465 | if (is_compat_task()) { |
0ac30be4 | 466 | ret = handle_signal32(signr, &ka, &info, oldset, regs); |
1da177e4 | 467 | } |
0ac30be4 | 468 | else |
1da177e4 | 469 | #endif |
0ac30be4 RM |
470 | ret = handle_signal(signr, &ka, &info, oldset, regs); |
471 | if (!ret) { | |
54dfe5dd HC |
472 | /* |
473 | * A signal was successfully delivered; the saved | |
474 | * sigmask will have been stored in the signal frame, | |
475 | * and will be restored by sigreturn, so we can simply | |
476 | * clear the TIF_RESTORE_SIGMASK flag. | |
477 | */ | |
478 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
479 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
0ac30be4 | 480 | |
753c4dd6 MS |
481 | /* |
482 | * Let tracing know that we've done the handler setup. | |
483 | */ | |
484 | tracehook_signal_handler(signr, &info, &ka, regs, | |
5e9a2692 | 485 | test_thread_flag(TIF_SINGLE_STEP)); |
54dfe5dd HC |
486 | } |
487 | return; | |
488 | } | |
489 | ||
490 | /* | |
491 | * If there's no signal to deliver, we just put the saved sigmask back. | |
492 | */ | |
493 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
494 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
495 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1da177e4 LT |
496 | } |
497 | ||
498 | /* Restart a different system call. */ | |
499 | if (retval == -ERESTART_RESTARTBLOCK | |
500 | && regs->psw.addr == continue_addr) { | |
501 | regs->gprs[2] = __NR_restart_syscall; | |
502 | set_thread_flag(TIF_RESTART_SVC); | |
503 | } | |
1da177e4 | 504 | } |
753c4dd6 MS |
505 | |
506 | void do_notify_resume(struct pt_regs *regs) | |
507 | { | |
508 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
509 | tracehook_notify_resume(regs); | |
ee18d64c DH |
510 | if (current->replacement_session_keyring) |
511 | key_replace_session_keyring(); | |
753c4dd6 | 512 | } |