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> |
1da177e4 LT |
28 | #include <asm/ucontext.h> |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/lowcore.h> | |
a806170e | 31 | #include "entry.h" |
1da177e4 LT |
32 | |
33 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
34 | ||
35 | ||
36 | typedef struct | |
37 | { | |
38 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
39 | struct sigcontext sc; | |
40 | _sigregs sregs; | |
41 | int signo; | |
42 | __u8 retcode[S390_SYSCALL_SIZE]; | |
43 | } sigframe; | |
44 | ||
45 | typedef struct | |
46 | { | |
47 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
48 | __u8 retcode[S390_SYSCALL_SIZE]; | |
49 | struct siginfo info; | |
50 | struct ucontext uc; | |
51 | } rt_sigframe; | |
52 | ||
1da177e4 LT |
53 | /* |
54 | * Atomically swap in the new signal mask, and wait for a signal. | |
55 | */ | |
56 | asmlinkage int | |
54dfe5dd | 57 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) |
1da177e4 | 58 | { |
1da177e4 LT |
59 | mask &= _BLOCKABLE; |
60 | spin_lock_irq(¤t->sighand->siglock); | |
54dfe5dd | 61 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
62 | siginitset(¤t->blocked, mask); |
63 | recalc_sigpending(); | |
64 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 | 65 | |
54dfe5dd HC |
66 | current->state = TASK_INTERRUPTIBLE; |
67 | schedule(); | |
68 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 | 69 | |
54dfe5dd | 70 | return -ERESTARTNOHAND; |
1da177e4 LT |
71 | } |
72 | ||
73 | asmlinkage long | |
74 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
75 | struct old_sigaction __user *oact) | |
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 | ||
105 | asmlinkage long | |
03ff9a23 | 106 | sys_sigaltstack(const stack_t __user *uss, 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 | ||
112 | ||
113 | ||
114 | /* Returns non-zero on fault. */ | |
115 | static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
116 | { | |
6837a8c3 GS |
117 | _sigregs user_sregs; |
118 | ||
1da177e4 LT |
119 | save_access_regs(current->thread.acrs); |
120 | ||
121 | /* Copy a 'clean' PSW mask to the user to avoid leaking | |
122 | information about whether PER is currently on. */ | |
c1821c2e | 123 | user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask); |
b05e3703 MS |
124 | user_sregs.regs.psw.addr = regs->psw.addr; |
125 | memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
126 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
127 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
128 | /* |
129 | * We have to store the fp registers to current->thread.fp_regs | |
130 | * to merge them with the emulated registers. | |
131 | */ | |
132 | save_fp_regs(¤t->thread.fp_regs); | |
6837a8c3 GS |
133 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
134 | sizeof(s390_fp_regs)); | |
135 | return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); | |
1da177e4 LT |
136 | } |
137 | ||
138 | /* Returns positive number on error */ | |
139 | static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
140 | { | |
1da177e4 | 141 | int err; |
6837a8c3 | 142 | _sigregs user_sregs; |
1da177e4 LT |
143 | |
144 | /* Alwys make any pending restarted system call return -EINTR */ | |
145 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
146 | ||
6837a8c3 | 147 | err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); |
1da177e4 LT |
148 | if (err) |
149 | return err; | |
b05e3703 MS |
150 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, |
151 | user_sregs.regs.psw.mask); | |
152 | regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr; | |
153 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
154 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
155 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
156 | restore_access_regs(current->thread.acrs); |
157 | ||
6837a8c3 GS |
158 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
159 | sizeof(s390_fp_regs)); | |
1da177e4 | 160 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
1da177e4 LT |
161 | |
162 | restore_fp_regs(¤t->thread.fp_regs); | |
59da2139 | 163 | regs->svcnr = 0; /* disable syscall checks */ |
1da177e4 LT |
164 | return 0; |
165 | } | |
166 | ||
03ff9a23 | 167 | asmlinkage long sys_sigreturn(void) |
1da177e4 | 168 | { |
03ff9a23 | 169 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
170 | sigframe __user *frame = (sigframe __user *)regs->gprs[15]; |
171 | sigset_t set; | |
172 | ||
173 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
174 | goto badframe; | |
175 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) | |
176 | goto badframe; | |
177 | ||
178 | sigdelsetmask(&set, ~_BLOCKABLE); | |
179 | spin_lock_irq(¤t->sighand->siglock); | |
180 | current->blocked = set; | |
181 | recalc_sigpending(); | |
182 | spin_unlock_irq(¤t->sighand->siglock); | |
183 | ||
184 | if (restore_sigregs(regs, &frame->sregs)) | |
185 | goto badframe; | |
186 | ||
187 | return regs->gprs[2]; | |
188 | ||
189 | badframe: | |
190 | force_sig(SIGSEGV, current); | |
191 | return 0; | |
192 | } | |
193 | ||
03ff9a23 | 194 | asmlinkage long sys_rt_sigreturn(void) |
1da177e4 | 195 | { |
03ff9a23 | 196 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
197 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; |
198 | sigset_t set; | |
199 | ||
200 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
201 | goto badframe; | |
202 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) | |
203 | goto badframe; | |
204 | ||
205 | sigdelsetmask(&set, ~_BLOCKABLE); | |
206 | spin_lock_irq(¤t->sighand->siglock); | |
207 | current->blocked = set; | |
208 | recalc_sigpending(); | |
209 | spin_unlock_irq(¤t->sighand->siglock); | |
210 | ||
211 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) | |
212 | goto badframe; | |
213 | ||
4e3df37e CLG |
214 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
215 | regs->gprs[15]) == -EFAULT) | |
216 | goto badframe; | |
1da177e4 LT |
217 | return regs->gprs[2]; |
218 | ||
219 | badframe: | |
220 | force_sig(SIGSEGV, current); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Set up a signal frame. | |
226 | */ | |
227 | ||
228 | ||
229 | /* | |
230 | * Determine which stack to use.. | |
231 | */ | |
232 | static inline void __user * | |
233 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
234 | { | |
235 | unsigned long sp; | |
236 | ||
237 | /* Default to using normal stack */ | |
238 | sp = regs->gprs[15]; | |
239 | ||
de553438 HC |
240 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
241 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) | |
242 | return (void __user *) -1UL; | |
243 | ||
1da177e4 LT |
244 | /* This is the X/Open sanctioned signal stack switching. */ |
245 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
246 | if (! sas_ss_flags(sp)) | |
247 | sp = current->sas_ss_sp + current->sas_ss_size; | |
248 | } | |
249 | ||
250 | /* This is the legacy signal stack switching. */ | |
251 | else if (!user_mode(regs) && | |
252 | !(ka->sa.sa_flags & SA_RESTORER) && | |
253 | ka->sa.sa_restorer) { | |
254 | sp = (unsigned long) ka->sa.sa_restorer; | |
255 | } | |
256 | ||
257 | return (void __user *)((sp - frame_size) & -8ul); | |
258 | } | |
259 | ||
260 | static inline int map_signal(int sig) | |
261 | { | |
262 | if (current_thread_info()->exec_domain | |
263 | && current_thread_info()->exec_domain->signal_invmap | |
264 | && sig < 32) | |
265 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
266 | else | |
267 | return sig; | |
268 | } | |
269 | ||
54dfe5dd HC |
270 | static int setup_frame(int sig, struct k_sigaction *ka, |
271 | sigset_t *set, struct pt_regs * regs) | |
1da177e4 LT |
272 | { |
273 | sigframe __user *frame; | |
274 | ||
275 | frame = get_sigframe(ka, regs, sizeof(sigframe)); | |
276 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) | |
277 | goto give_sigsegv; | |
278 | ||
de553438 HC |
279 | if (frame == (void __user *) -1UL) |
280 | goto give_sigsegv; | |
281 | ||
1da177e4 LT |
282 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) |
283 | goto give_sigsegv; | |
284 | ||
285 | if (save_sigregs(regs, &frame->sregs)) | |
286 | goto give_sigsegv; | |
287 | if (__put_user(&frame->sregs, &frame->sc.sregs)) | |
288 | goto give_sigsegv; | |
289 | ||
290 | /* Set up to return from userspace. If provided, use a stub | |
291 | already in userspace. */ | |
292 | if (ka->sa.sa_flags & SA_RESTORER) { | |
293 | regs->gprs[14] = (unsigned long) | |
294 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
295 | } else { | |
296 | regs->gprs[14] = (unsigned long) | |
297 | frame->retcode | PSW_ADDR_AMODE; | |
298 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
299 | (u16 __user *)(frame->retcode))) | |
300 | goto give_sigsegv; | |
301 | } | |
302 | ||
303 | /* Set up backchain. */ | |
304 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
305 | goto give_sigsegv; | |
306 | ||
307 | /* Set up registers for signal handler */ | |
308 | regs->gprs[15] = (unsigned long) frame; | |
309 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
310 | ||
311 | regs->gprs[2] = map_signal(sig); | |
312 | regs->gprs[3] = (unsigned long) &frame->sc; | |
313 | ||
314 | /* We forgot to include these in the sigcontext. | |
315 | To avoid breaking binary compatibility, they are passed as args. */ | |
316 | regs->gprs[4] = current->thread.trap_no; | |
317 | regs->gprs[5] = current->thread.prot_addr; | |
318 | ||
319 | /* Place signal number on stack to allow backtrace from handler. */ | |
320 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
321 | goto give_sigsegv; | |
54dfe5dd | 322 | return 0; |
1da177e4 LT |
323 | |
324 | give_sigsegv: | |
325 | force_sigsegv(sig, current); | |
54dfe5dd | 326 | return -EFAULT; |
1da177e4 LT |
327 | } |
328 | ||
54dfe5dd | 329 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
330 | sigset_t *set, struct pt_regs * regs) |
331 | { | |
332 | int err = 0; | |
333 | rt_sigframe __user *frame; | |
334 | ||
335 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); | |
336 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) | |
337 | goto give_sigsegv; | |
338 | ||
de553438 HC |
339 | if (frame == (void __user *) -1UL) |
340 | goto give_sigsegv; | |
341 | ||
1da177e4 LT |
342 | if (copy_siginfo_to_user(&frame->info, info)) |
343 | goto give_sigsegv; | |
344 | ||
345 | /* Create the ucontext. */ | |
346 | err |= __put_user(0, &frame->uc.uc_flags); | |
c2814476 AV |
347 | err |= __put_user(NULL, &frame->uc.uc_link); |
348 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
1da177e4 LT |
349 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
350 | &frame->uc.uc_stack.ss_flags); | |
351 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
352 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); | |
353 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
354 | if (err) | |
355 | goto give_sigsegv; | |
356 | ||
357 | /* Set up to return from userspace. If provided, use a stub | |
358 | already in userspace. */ | |
359 | if (ka->sa.sa_flags & SA_RESTORER) { | |
360 | regs->gprs[14] = (unsigned long) | |
361 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
362 | } else { | |
363 | regs->gprs[14] = (unsigned long) | |
364 | frame->retcode | PSW_ADDR_AMODE; | |
b44df334 HC |
365 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
366 | (u16 __user *)(frame->retcode))) | |
367 | goto give_sigsegv; | |
1da177e4 LT |
368 | } |
369 | ||
370 | /* Set up backchain. */ | |
371 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
372 | goto give_sigsegv; | |
373 | ||
374 | /* Set up registers for signal handler */ | |
375 | regs->gprs[15] = (unsigned long) frame; | |
376 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
377 | ||
378 | regs->gprs[2] = map_signal(sig); | |
379 | regs->gprs[3] = (unsigned long) &frame->info; | |
380 | regs->gprs[4] = (unsigned long) &frame->uc; | |
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 |
1da177e4 | 488 | if (test_thread_flag(TIF_31BIT)) { |
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 RM |
503 | |
504 | /* | |
505 | * If we would have taken a single-step trap | |
506 | * for a normal instruction, act like we took | |
507 | * one for the handler setup. | |
508 | */ | |
509 | if (current->thread.per_info.single_step) | |
510 | set_thread_flag(TIF_SINGLE_STEP); | |
753c4dd6 MS |
511 | |
512 | /* | |
513 | * Let tracing know that we've done the handler setup. | |
514 | */ | |
515 | tracehook_signal_handler(signr, &info, &ka, regs, | |
516 | test_thread_flag(TIF_SINGLE_STEP)); | |
54dfe5dd HC |
517 | } |
518 | return; | |
519 | } | |
520 | ||
521 | /* | |
522 | * If there's no signal to deliver, we just put the saved sigmask back. | |
523 | */ | |
524 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
525 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
526 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1da177e4 LT |
527 | } |
528 | ||
529 | /* Restart a different system call. */ | |
530 | if (retval == -ERESTART_RESTARTBLOCK | |
531 | && regs->psw.addr == continue_addr) { | |
532 | regs->gprs[2] = __NR_restart_syscall; | |
533 | set_thread_flag(TIF_RESTART_SVC); | |
534 | } | |
1da177e4 | 535 | } |
753c4dd6 MS |
536 | |
537 | void do_notify_resume(struct pt_regs *regs) | |
538 | { | |
539 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
540 | tracehook_notify_resume(regs); | |
541 | } |