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> | |
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 | { |
1da177e4 LT |
60 | mask &= _BLOCKABLE; |
61 | spin_lock_irq(¤t->sighand->siglock); | |
54dfe5dd | 62 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
63 | siginitset(¤t->blocked, mask); |
64 | recalc_sigpending(); | |
65 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 | 66 | |
0b4d7890 | 67 | set_current_state(TASK_INTERRUPTIBLE); |
54dfe5dd HC |
68 | schedule(); |
69 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 | 70 | |
54dfe5dd | 71 | return -ERESTARTNOHAND; |
1da177e4 LT |
72 | } |
73 | ||
26689452 HC |
74 | SYSCALL_DEFINE3(sigaction, int, sig, const struct old_sigaction __user *, act, |
75 | struct old_sigaction __user *, oact) | |
1da177e4 LT |
76 | { |
77 | struct k_sigaction new_ka, old_ka; | |
78 | int ret; | |
79 | ||
80 | if (act) { | |
81 | old_sigset_t mask; | |
82 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
83 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
12bae235 HC |
84 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
85 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
86 | __get_user(mask, &act->sa_mask)) | |
1da177e4 | 87 | return -EFAULT; |
1da177e4 LT |
88 | siginitset(&new_ka.sa.sa_mask, mask); |
89 | } | |
90 | ||
91 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
92 | ||
93 | if (!ret && oact) { | |
94 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
95 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
12bae235 HC |
96 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
97 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
98 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
1da177e4 | 99 | return -EFAULT; |
1da177e4 LT |
100 | } |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
26689452 HC |
105 | SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss, |
106 | stack_t __user *, uoss) | |
1da177e4 | 107 | { |
03ff9a23 | 108 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
109 | return do_sigaltstack(uss, uoss, regs->gprs[15]); |
110 | } | |
111 | ||
1da177e4 LT |
112 | /* Returns non-zero on fault. */ |
113 | static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
114 | { | |
6837a8c3 GS |
115 | _sigregs user_sregs; |
116 | ||
1da177e4 LT |
117 | save_access_regs(current->thread.acrs); |
118 | ||
119 | /* Copy a 'clean' PSW mask to the user to avoid leaking | |
120 | information about whether PER is currently on. */ | |
c1821c2e | 121 | user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask); |
b05e3703 MS |
122 | user_sregs.regs.psw.addr = regs->psw.addr; |
123 | memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
124 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
125 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
126 | /* |
127 | * We have to store the fp registers to current->thread.fp_regs | |
128 | * to merge them with the emulated registers. | |
129 | */ | |
130 | save_fp_regs(¤t->thread.fp_regs); | |
6837a8c3 GS |
131 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
132 | sizeof(s390_fp_regs)); | |
133 | return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); | |
1da177e4 LT |
134 | } |
135 | ||
136 | /* Returns positive number on error */ | |
137 | static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
138 | { | |
1da177e4 | 139 | int err; |
6837a8c3 | 140 | _sigregs user_sregs; |
1da177e4 LT |
141 | |
142 | /* Alwys make any pending restarted system call return -EINTR */ | |
143 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
144 | ||
6837a8c3 | 145 | err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); |
1da177e4 LT |
146 | if (err) |
147 | return err; | |
b05e3703 MS |
148 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, |
149 | user_sregs.regs.psw.mask); | |
150 | regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr; | |
151 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
152 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
153 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
154 | restore_access_regs(current->thread.acrs); |
155 | ||
6837a8c3 GS |
156 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
157 | sizeof(s390_fp_regs)); | |
1da177e4 | 158 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
1da177e4 LT |
159 | |
160 | restore_fp_regs(¤t->thread.fp_regs); | |
59da2139 | 161 | regs->svcnr = 0; /* disable syscall checks */ |
1da177e4 LT |
162 | return 0; |
163 | } | |
164 | ||
26689452 | 165 | SYSCALL_DEFINE0(sigreturn) |
1da177e4 | 166 | { |
03ff9a23 | 167 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
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 | ||
26689452 | 192 | SYSCALL_DEFINE0(rt_sigreturn) |
1da177e4 | 193 | { |
03ff9a23 | 194 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
195 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; |
196 | sigset_t set; | |
197 | ||
198 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
199 | goto badframe; | |
200 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) | |
201 | goto badframe; | |
202 | ||
203 | sigdelsetmask(&set, ~_BLOCKABLE); | |
204 | spin_lock_irq(¤t->sighand->siglock); | |
205 | current->blocked = set; | |
206 | recalc_sigpending(); | |
207 | spin_unlock_irq(¤t->sighand->siglock); | |
208 | ||
209 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) | |
210 | goto badframe; | |
211 | ||
4e3df37e CLG |
212 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
213 | regs->gprs[15]) == -EFAULT) | |
214 | goto badframe; | |
1da177e4 LT |
215 | return regs->gprs[2]; |
216 | ||
217 | badframe: | |
218 | force_sig(SIGSEGV, current); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /* | |
223 | * Set up a signal frame. | |
224 | */ | |
225 | ||
226 | ||
227 | /* | |
228 | * Determine which stack to use.. | |
229 | */ | |
230 | static inline void __user * | |
231 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
232 | { | |
233 | unsigned long sp; | |
234 | ||
235 | /* Default to using normal stack */ | |
236 | sp = regs->gprs[15]; | |
237 | ||
de553438 HC |
238 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
239 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) | |
240 | return (void __user *) -1UL; | |
241 | ||
1da177e4 LT |
242 | /* This is the X/Open sanctioned signal stack switching. */ |
243 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
244 | if (! sas_ss_flags(sp)) | |
245 | sp = current->sas_ss_sp + current->sas_ss_size; | |
246 | } | |
247 | ||
248 | /* This is the legacy signal stack switching. */ | |
249 | else if (!user_mode(regs) && | |
250 | !(ka->sa.sa_flags & SA_RESTORER) && | |
251 | ka->sa.sa_restorer) { | |
252 | sp = (unsigned long) ka->sa.sa_restorer; | |
253 | } | |
254 | ||
255 | return (void __user *)((sp - frame_size) & -8ul); | |
256 | } | |
257 | ||
258 | static inline int map_signal(int sig) | |
259 | { | |
260 | if (current_thread_info()->exec_domain | |
261 | && current_thread_info()->exec_domain->signal_invmap | |
262 | && sig < 32) | |
263 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
264 | else | |
265 | return sig; | |
266 | } | |
267 | ||
54dfe5dd HC |
268 | static int setup_frame(int sig, struct k_sigaction *ka, |
269 | sigset_t *set, struct pt_regs * regs) | |
1da177e4 LT |
270 | { |
271 | sigframe __user *frame; | |
272 | ||
273 | frame = get_sigframe(ka, regs, sizeof(sigframe)); | |
274 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) | |
275 | goto give_sigsegv; | |
276 | ||
de553438 HC |
277 | if (frame == (void __user *) -1UL) |
278 | goto give_sigsegv; | |
279 | ||
1da177e4 LT |
280 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) |
281 | goto give_sigsegv; | |
282 | ||
283 | if (save_sigregs(regs, &frame->sregs)) | |
284 | goto give_sigsegv; | |
285 | if (__put_user(&frame->sregs, &frame->sc.sregs)) | |
286 | goto give_sigsegv; | |
287 | ||
288 | /* Set up to return from userspace. If provided, use a stub | |
289 | already in userspace. */ | |
290 | if (ka->sa.sa_flags & SA_RESTORER) { | |
291 | regs->gprs[14] = (unsigned long) | |
292 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
293 | } else { | |
294 | regs->gprs[14] = (unsigned long) | |
295 | frame->retcode | PSW_ADDR_AMODE; | |
296 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
297 | (u16 __user *)(frame->retcode))) | |
298 | goto give_sigsegv; | |
299 | } | |
300 | ||
301 | /* Set up backchain. */ | |
302 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
303 | goto give_sigsegv; | |
304 | ||
305 | /* Set up registers for signal handler */ | |
306 | regs->gprs[15] = (unsigned long) frame; | |
307 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
308 | ||
309 | regs->gprs[2] = map_signal(sig); | |
310 | regs->gprs[3] = (unsigned long) &frame->sc; | |
311 | ||
312 | /* We forgot to include these in the sigcontext. | |
313 | To avoid breaking binary compatibility, they are passed as args. */ | |
314 | regs->gprs[4] = current->thread.trap_no; | |
315 | regs->gprs[5] = current->thread.prot_addr; | |
86f2552b | 316 | regs->gprs[6] = task_thread_info(current)->last_break; |
1da177e4 LT |
317 | |
318 | /* Place signal number on stack to allow backtrace from handler. */ | |
319 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
320 | goto give_sigsegv; | |
54dfe5dd | 321 | return 0; |
1da177e4 LT |
322 | |
323 | give_sigsegv: | |
324 | force_sigsegv(sig, current); | |
54dfe5dd | 325 | return -EFAULT; |
1da177e4 LT |
326 | } |
327 | ||
54dfe5dd | 328 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
329 | sigset_t *set, struct pt_regs * regs) |
330 | { | |
331 | int err = 0; | |
332 | rt_sigframe __user *frame; | |
333 | ||
334 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); | |
335 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) | |
336 | goto give_sigsegv; | |
337 | ||
de553438 HC |
338 | if (frame == (void __user *) -1UL) |
339 | goto give_sigsegv; | |
340 | ||
1da177e4 LT |
341 | if (copy_siginfo_to_user(&frame->info, info)) |
342 | goto give_sigsegv; | |
343 | ||
344 | /* Create the ucontext. */ | |
345 | err |= __put_user(0, &frame->uc.uc_flags); | |
c2814476 AV |
346 | err |= __put_user(NULL, &frame->uc.uc_link); |
347 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
1da177e4 LT |
348 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
349 | &frame->uc.uc_stack.ss_flags); | |
350 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
351 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); | |
352 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
353 | if (err) | |
354 | goto give_sigsegv; | |
355 | ||
356 | /* Set up to return from userspace. If provided, use a stub | |
357 | already in userspace. */ | |
358 | if (ka->sa.sa_flags & SA_RESTORER) { | |
359 | regs->gprs[14] = (unsigned long) | |
360 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
361 | } else { | |
362 | regs->gprs[14] = (unsigned long) | |
363 | frame->retcode | PSW_ADDR_AMODE; | |
b44df334 HC |
364 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
365 | (u16 __user *)(frame->retcode))) | |
366 | goto give_sigsegv; | |
1da177e4 LT |
367 | } |
368 | ||
369 | /* Set up backchain. */ | |
370 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
371 | goto give_sigsegv; | |
372 | ||
373 | /* Set up registers for signal handler */ | |
374 | regs->gprs[15] = (unsigned long) frame; | |
375 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
376 | ||
377 | regs->gprs[2] = map_signal(sig); | |
378 | regs->gprs[3] = (unsigned long) &frame->info; | |
379 | regs->gprs[4] = (unsigned long) &frame->uc; | |
86f2552b | 380 | regs->gprs[5] = task_thread_info(current)->last_break; |
54dfe5dd | 381 | return 0; |
1da177e4 LT |
382 | |
383 | give_sigsegv: | |
384 | force_sigsegv(sig, current); | |
54dfe5dd | 385 | return -EFAULT; |
1da177e4 LT |
386 | } |
387 | ||
388 | /* | |
389 | * OK, we're invoking a handler | |
390 | */ | |
391 | ||
54dfe5dd | 392 | static int |
1da177e4 LT |
393 | handle_signal(unsigned long sig, struct k_sigaction *ka, |
394 | siginfo_t *info, sigset_t *oldset, struct pt_regs * regs) | |
395 | { | |
54dfe5dd HC |
396 | int ret; |
397 | ||
1da177e4 LT |
398 | /* Set up the stack frame */ |
399 | if (ka->sa.sa_flags & SA_SIGINFO) | |
54dfe5dd | 400 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 401 | else |
54dfe5dd HC |
402 | ret = setup_frame(sig, ka, oldset, regs); |
403 | ||
404 | if (ret == 0) { | |
405 | spin_lock_irq(¤t->sighand->siglock); | |
406 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
407 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
408 | sigaddset(¤t->blocked,sig); | |
409 | recalc_sigpending(); | |
410 | spin_unlock_irq(¤t->sighand->siglock); | |
411 | } | |
1da177e4 | 412 | |
54dfe5dd | 413 | return ret; |
1da177e4 LT |
414 | } |
415 | ||
416 | /* | |
417 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
418 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
419 | * mistake. | |
420 | * | |
421 | * Note that we go through the signals twice: once to check the signals that | |
422 | * the kernel can handle, and then we build all the user-level signal handling | |
423 | * stack-frames in one go after that. | |
424 | */ | |
54dfe5dd | 425 | void do_signal(struct pt_regs *regs) |
1da177e4 LT |
426 | { |
427 | unsigned long retval = 0, continue_addr = 0, restart_addr = 0; | |
428 | siginfo_t info; | |
429 | int signr; | |
430 | struct k_sigaction ka; | |
54dfe5dd | 431 | sigset_t *oldset; |
1da177e4 LT |
432 | |
433 | /* | |
434 | * We want the common case to go fast, which | |
435 | * is why we may in certain cases get here from | |
436 | * kernel mode. Just return without doing anything | |
437 | * if so. | |
438 | */ | |
439 | if (!user_mode(regs)) | |
54dfe5dd | 440 | return; |
1da177e4 | 441 | |
54dfe5dd HC |
442 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
443 | oldset = ¤t->saved_sigmask; | |
444 | else | |
1da177e4 LT |
445 | oldset = ¤t->blocked; |
446 | ||
447 | /* Are we from a system call? */ | |
59da2139 | 448 | if (regs->svcnr) { |
1da177e4 LT |
449 | continue_addr = regs->psw.addr; |
450 | restart_addr = continue_addr - regs->ilc; | |
451 | retval = regs->gprs[2]; | |
452 | ||
453 | /* Prepare for system call restart. We do this here so that a | |
454 | debugger will see the already changed PSW. */ | |
54dfe5dd HC |
455 | switch (retval) { |
456 | case -ERESTARTNOHAND: | |
457 | case -ERESTARTSYS: | |
458 | case -ERESTARTNOINTR: | |
1da177e4 LT |
459 | regs->gprs[2] = regs->orig_gpr2; |
460 | regs->psw.addr = restart_addr; | |
54dfe5dd HC |
461 | break; |
462 | case -ERESTART_RESTARTBLOCK: | |
1da177e4 LT |
463 | regs->gprs[2] = -EINTR; |
464 | } | |
59da2139 | 465 | regs->svcnr = 0; /* Don't deal with this again. */ |
1da177e4 LT |
466 | } |
467 | ||
468 | /* Get signal to deliver. When running under ptrace, at this point | |
469 | the debugger may change all our registers ... */ | |
470 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
471 | ||
472 | /* Depending on the signal settings we may need to revert the | |
473 | decision to restart the system call. */ | |
474 | if (signr > 0 && regs->psw.addr == restart_addr) { | |
475 | if (retval == -ERESTARTNOHAND | |
476 | || (retval == -ERESTARTSYS | |
477 | && !(current->sighand->action[signr-1].sa.sa_flags | |
478 | & SA_RESTART))) { | |
479 | regs->gprs[2] = -EINTR; | |
480 | regs->psw.addr = continue_addr; | |
481 | } | |
482 | } | |
483 | ||
484 | if (signr > 0) { | |
485 | /* Whee! Actually deliver the signal. */ | |
0ac30be4 | 486 | int ret; |
347a8dc3 | 487 | #ifdef CONFIG_COMPAT |
7757591a | 488 | if (is_compat_task()) { |
0ac30be4 | 489 | ret = handle_signal32(signr, &ka, &info, oldset, regs); |
1da177e4 | 490 | } |
0ac30be4 | 491 | else |
1da177e4 | 492 | #endif |
0ac30be4 RM |
493 | ret = handle_signal(signr, &ka, &info, oldset, regs); |
494 | if (!ret) { | |
54dfe5dd HC |
495 | /* |
496 | * A signal was successfully delivered; the saved | |
497 | * sigmask will have been stored in the signal frame, | |
498 | * and will be restored by sigreturn, so we can simply | |
499 | * clear the TIF_RESTORE_SIGMASK flag. | |
500 | */ | |
501 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
502 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
0ac30be4 | 503 | |
753c4dd6 MS |
504 | /* |
505 | * Let tracing know that we've done the handler setup. | |
506 | */ | |
507 | tracehook_signal_handler(signr, &info, &ka, regs, | |
6f50248e | 508 | current->thread.per_info.single_step); |
54dfe5dd HC |
509 | } |
510 | return; | |
511 | } | |
512 | ||
513 | /* | |
514 | * If there's no signal to deliver, we just put the saved sigmask back. | |
515 | */ | |
516 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
517 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
518 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1da177e4 LT |
519 | } |
520 | ||
521 | /* Restart a different system call. */ | |
522 | if (retval == -ERESTART_RESTARTBLOCK | |
523 | && regs->psw.addr == continue_addr) { | |
524 | regs->gprs[2] = __NR_restart_syscall; | |
525 | set_thread_flag(TIF_RESTART_SVC); | |
526 | } | |
1da177e4 | 527 | } |
753c4dd6 MS |
528 | |
529 | void do_notify_resume(struct pt_regs *regs) | |
530 | { | |
531 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
532 | tracehook_notify_resume(regs); | |
ee18d64c DH |
533 | if (current->replacement_session_keyring) |
534 | key_replace_session_keyring(); | |
753c4dd6 | 535 | } |