]>
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 | { |
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 | 67 | schedule(); |
9e8ed3ae | 68 | set_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. */ | |
d4e81b35 MS |
119 | user_sregs.regs.psw.mask = psw_user_bits | |
120 | (regs->psw.mask & PSW_MASK_USER); | |
b05e3703 MS |
121 | user_sregs.regs.psw.addr = regs->psw.addr; |
122 | memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
123 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
124 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
125 | /* |
126 | * We have to store the fp registers to current->thread.fp_regs | |
127 | * to merge them with the emulated registers. | |
128 | */ | |
129 | save_fp_regs(¤t->thread.fp_regs); | |
6837a8c3 GS |
130 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
131 | sizeof(s390_fp_regs)); | |
132 | return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); | |
1da177e4 LT |
133 | } |
134 | ||
135 | /* Returns positive number on error */ | |
136 | static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
137 | { | |
1da177e4 | 138 | int err; |
6837a8c3 | 139 | _sigregs user_sregs; |
1da177e4 LT |
140 | |
141 | /* Alwys make any pending restarted system call return -EINTR */ | |
142 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
143 | ||
6837a8c3 | 144 | err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); |
1da177e4 LT |
145 | if (err) |
146 | return err; | |
d4e81b35 | 147 | /* Use regs->psw.mask instead of psw_user_bits to preserve PER bit. */ |
b50511e4 | 148 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 MS |
149 | (user_sregs.regs.psw.mask & PSW_MASK_USER); |
150 | /* Check for invalid amode */ | |
151 | if (regs->psw.mask & PSW_MASK_EA) | |
152 | regs->psw.mask |= PSW_MASK_BA; | |
153 | regs->psw.addr = user_sregs.regs.psw.addr; | |
b05e3703 | 154 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); |
6837a8c3 GS |
155 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
156 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
157 | restore_access_regs(current->thread.acrs); |
158 | ||
6837a8c3 GS |
159 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
160 | sizeof(s390_fp_regs)); | |
1da177e4 | 161 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
1da177e4 LT |
162 | |
163 | restore_fp_regs(¤t->thread.fp_regs); | |
b6ef5bb3 | 164 | clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */ |
1da177e4 LT |
165 | return 0; |
166 | } | |
167 | ||
26689452 | 168 | SYSCALL_DEFINE0(sigreturn) |
1da177e4 | 169 | { |
03ff9a23 | 170 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
171 | sigframe __user *frame = (sigframe __user *)regs->gprs[15]; |
172 | sigset_t set; | |
173 | ||
174 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
175 | goto badframe; | |
176 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) | |
177 | goto badframe; | |
1da177e4 | 178 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 179 | set_current_blocked(&set); |
1da177e4 LT |
180 | if (restore_sigregs(regs, &frame->sregs)) |
181 | goto badframe; | |
1da177e4 | 182 | return regs->gprs[2]; |
1da177e4 LT |
183 | badframe: |
184 | force_sig(SIGSEGV, current); | |
185 | return 0; | |
186 | } | |
187 | ||
26689452 | 188 | SYSCALL_DEFINE0(rt_sigreturn) |
1da177e4 | 189 | { |
03ff9a23 | 190 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
191 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; |
192 | sigset_t set; | |
193 | ||
194 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
195 | goto badframe; | |
196 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) | |
197 | goto badframe; | |
1da177e4 | 198 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 199 | set_current_blocked(&set); |
1da177e4 LT |
200 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) |
201 | goto badframe; | |
4e3df37e CLG |
202 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
203 | regs->gprs[15]) == -EFAULT) | |
204 | goto badframe; | |
1da177e4 | 205 | return regs->gprs[2]; |
1da177e4 LT |
206 | badframe: |
207 | force_sig(SIGSEGV, current); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Set up a signal frame. | |
213 | */ | |
214 | ||
215 | ||
216 | /* | |
217 | * Determine which stack to use.. | |
218 | */ | |
219 | static inline void __user * | |
220 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
221 | { | |
222 | unsigned long sp; | |
223 | ||
224 | /* Default to using normal stack */ | |
225 | sp = regs->gprs[15]; | |
226 | ||
de553438 HC |
227 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
228 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) | |
229 | return (void __user *) -1UL; | |
230 | ||
1da177e4 LT |
231 | /* This is the X/Open sanctioned signal stack switching. */ |
232 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
233 | if (! sas_ss_flags(sp)) | |
234 | sp = current->sas_ss_sp + current->sas_ss_size; | |
235 | } | |
236 | ||
237 | /* This is the legacy signal stack switching. */ | |
238 | else if (!user_mode(regs) && | |
239 | !(ka->sa.sa_flags & SA_RESTORER) && | |
240 | ka->sa.sa_restorer) { | |
241 | sp = (unsigned long) ka->sa.sa_restorer; | |
242 | } | |
243 | ||
244 | return (void __user *)((sp - frame_size) & -8ul); | |
245 | } | |
246 | ||
247 | static inline int map_signal(int sig) | |
248 | { | |
249 | if (current_thread_info()->exec_domain | |
250 | && current_thread_info()->exec_domain->signal_invmap | |
251 | && sig < 32) | |
252 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
253 | else | |
254 | return sig; | |
255 | } | |
256 | ||
54dfe5dd HC |
257 | static int setup_frame(int sig, struct k_sigaction *ka, |
258 | sigset_t *set, struct pt_regs * regs) | |
1da177e4 LT |
259 | { |
260 | sigframe __user *frame; | |
261 | ||
262 | frame = get_sigframe(ka, regs, sizeof(sigframe)); | |
263 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) | |
264 | goto give_sigsegv; | |
265 | ||
de553438 HC |
266 | if (frame == (void __user *) -1UL) |
267 | goto give_sigsegv; | |
268 | ||
1da177e4 LT |
269 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) |
270 | goto give_sigsegv; | |
271 | ||
272 | if (save_sigregs(regs, &frame->sregs)) | |
273 | goto give_sigsegv; | |
274 | if (__put_user(&frame->sregs, &frame->sc.sregs)) | |
275 | goto give_sigsegv; | |
276 | ||
277 | /* Set up to return from userspace. If provided, use a stub | |
278 | already in userspace. */ | |
279 | if (ka->sa.sa_flags & SA_RESTORER) { | |
280 | regs->gprs[14] = (unsigned long) | |
281 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
282 | } else { | |
283 | regs->gprs[14] = (unsigned long) | |
284 | frame->retcode | PSW_ADDR_AMODE; | |
285 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
286 | (u16 __user *)(frame->retcode))) | |
287 | goto give_sigsegv; | |
288 | } | |
289 | ||
290 | /* Set up backchain. */ | |
291 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
292 | goto give_sigsegv; | |
293 | ||
294 | /* Set up registers for signal handler */ | |
295 | regs->gprs[15] = (unsigned long) frame; | |
d4e81b35 | 296 | regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA; /* 64 bit amode */ |
1da177e4 LT |
297 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; |
298 | ||
299 | regs->gprs[2] = map_signal(sig); | |
300 | regs->gprs[3] = (unsigned long) &frame->sc; | |
301 | ||
302 | /* We forgot to include these in the sigcontext. | |
303 | To avoid breaking binary compatibility, they are passed as args. */ | |
aa33c8cb MS |
304 | if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || |
305 | sig == SIGTRAP || sig == SIGFPE) { | |
306 | /* set extra registers only for synchronous signals */ | |
307 | regs->gprs[4] = regs->int_code & 127; | |
308 | regs->gprs[5] = regs->int_parm_long; | |
309 | regs->gprs[6] = task_thread_info(current)->last_break; | |
310 | } | |
1da177e4 LT |
311 | |
312 | /* Place signal number on stack to allow backtrace from handler. */ | |
313 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
314 | goto give_sigsegv; | |
54dfe5dd | 315 | return 0; |
1da177e4 LT |
316 | |
317 | give_sigsegv: | |
318 | force_sigsegv(sig, current); | |
54dfe5dd | 319 | return -EFAULT; |
1da177e4 LT |
320 | } |
321 | ||
54dfe5dd | 322 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
323 | sigset_t *set, struct pt_regs * regs) |
324 | { | |
325 | int err = 0; | |
326 | rt_sigframe __user *frame; | |
327 | ||
328 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); | |
329 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) | |
330 | goto give_sigsegv; | |
331 | ||
de553438 HC |
332 | if (frame == (void __user *) -1UL) |
333 | goto give_sigsegv; | |
334 | ||
1da177e4 LT |
335 | if (copy_siginfo_to_user(&frame->info, info)) |
336 | goto give_sigsegv; | |
337 | ||
338 | /* Create the ucontext. */ | |
339 | err |= __put_user(0, &frame->uc.uc_flags); | |
c2814476 AV |
340 | err |= __put_user(NULL, &frame->uc.uc_link); |
341 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
1da177e4 LT |
342 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
343 | &frame->uc.uc_stack.ss_flags); | |
344 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
345 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); | |
346 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
347 | if (err) | |
348 | goto give_sigsegv; | |
349 | ||
350 | /* Set up to return from userspace. If provided, use a stub | |
351 | already in userspace. */ | |
352 | if (ka->sa.sa_flags & SA_RESTORER) { | |
353 | regs->gprs[14] = (unsigned long) | |
354 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
355 | } else { | |
356 | regs->gprs[14] = (unsigned long) | |
357 | frame->retcode | PSW_ADDR_AMODE; | |
b44df334 HC |
358 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
359 | (u16 __user *)(frame->retcode))) | |
360 | goto give_sigsegv; | |
1da177e4 LT |
361 | } |
362 | ||
363 | /* Set up backchain. */ | |
364 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
365 | goto give_sigsegv; | |
366 | ||
367 | /* Set up registers for signal handler */ | |
368 | regs->gprs[15] = (unsigned long) frame; | |
d4e81b35 | 369 | regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA; /* 64 bit amode */ |
1da177e4 LT |
370 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; |
371 | ||
372 | regs->gprs[2] = map_signal(sig); | |
373 | regs->gprs[3] = (unsigned long) &frame->info; | |
374 | regs->gprs[4] = (unsigned long) &frame->uc; | |
86f2552b | 375 | regs->gprs[5] = task_thread_info(current)->last_break; |
54dfe5dd | 376 | return 0; |
1da177e4 LT |
377 | |
378 | give_sigsegv: | |
379 | force_sigsegv(sig, current); | |
54dfe5dd | 380 | return -EFAULT; |
1da177e4 LT |
381 | } |
382 | ||
391c62fe HC |
383 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
384 | siginfo_t *info, sigset_t *oldset, | |
385 | struct pt_regs *regs) | |
1da177e4 | 386 | { |
391c62fe | 387 | sigset_t blocked; |
54dfe5dd HC |
388 | int ret; |
389 | ||
1da177e4 LT |
390 | /* Set up the stack frame */ |
391 | if (ka->sa.sa_flags & SA_SIGINFO) | |
54dfe5dd | 392 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 393 | else |
54dfe5dd | 394 | ret = setup_frame(sig, ka, oldset, regs); |
391c62fe HC |
395 | if (ret) |
396 | return ret; | |
397 | sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); | |
398 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
399 | sigaddset(&blocked, sig); | |
400 | set_current_blocked(&blocked); | |
401 | return 0; | |
1da177e4 LT |
402 | } |
403 | ||
404 | /* | |
405 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
406 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
407 | * mistake. | |
408 | * | |
409 | * Note that we go through the signals twice: once to check the signals that | |
410 | * the kernel can handle, and then we build all the user-level signal handling | |
411 | * stack-frames in one go after that. | |
412 | */ | |
54dfe5dd | 413 | void do_signal(struct pt_regs *regs) |
1da177e4 | 414 | { |
1da177e4 LT |
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 | ||
20b40a79 MS |
434 | /* |
435 | * Get signal to deliver. When running under ptrace, at this point | |
436 | * the debugger may change all our registers, including the system | |
437 | * call information. | |
438 | */ | |
b6ef5bb3 | 439 | current_thread_info()->system_call = |
aa33c8cb | 440 | test_thread_flag(TIF_SYSCALL) ? regs->int_code : 0; |
1da177e4 | 441 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
1da177e4 LT |
442 | |
443 | if (signr > 0) { | |
444 | /* Whee! Actually deliver the signal. */ | |
b6ef5bb3 | 445 | if (current_thread_info()->system_call) { |
aa33c8cb | 446 | regs->int_code = current_thread_info()->system_call; |
20b40a79 MS |
447 | /* Check for system call restarting. */ |
448 | switch (regs->gprs[2]) { | |
449 | case -ERESTART_RESTARTBLOCK: | |
450 | case -ERESTARTNOHAND: | |
451 | regs->gprs[2] = -EINTR; | |
452 | break; | |
453 | case -ERESTARTSYS: | |
454 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
455 | regs->gprs[2] = -EINTR; | |
456 | break; | |
457 | } | |
458 | /* fallthrough */ | |
459 | case -ERESTARTNOINTR: | |
460 | regs->gprs[2] = regs->orig_gpr2; | |
ccf45caf MS |
461 | regs->psw.addr = |
462 | __rewind_psw(regs->psw, | |
aa33c8cb | 463 | regs->int_code >> 16); |
20b40a79 MS |
464 | break; |
465 | } | |
20b40a79 | 466 | } |
d9ae6772 MS |
467 | /* No longer in a system call */ |
468 | clear_thread_flag(TIF_SYSCALL); | |
20b40a79 MS |
469 | |
470 | if ((is_compat_task() ? | |
471 | handle_signal32(signr, &ka, &info, oldset, regs) : | |
472 | handle_signal(signr, &ka, &info, oldset, regs)) == 0) { | |
54dfe5dd HC |
473 | /* |
474 | * A signal was successfully delivered; the saved | |
475 | * sigmask will have been stored in the signal frame, | |
476 | * and will be restored by sigreturn, so we can simply | |
477 | * clear the TIF_RESTORE_SIGMASK flag. | |
478 | */ | |
479 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
480 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
0ac30be4 | 481 | |
753c4dd6 MS |
482 | /* |
483 | * Let tracing know that we've done the handler setup. | |
484 | */ | |
485 | tracehook_signal_handler(signr, &info, &ka, regs, | |
20b40a79 | 486 | test_thread_flag(TIF_SINGLE_STEP)); |
54dfe5dd HC |
487 | } |
488 | return; | |
489 | } | |
490 | ||
20b40a79 | 491 | /* No handlers present - check for system call restart */ |
d9ae6772 | 492 | clear_thread_flag(TIF_SYSCALL); |
b6ef5bb3 | 493 | if (current_thread_info()->system_call) { |
aa33c8cb | 494 | regs->int_code = current_thread_info()->system_call; |
20b40a79 MS |
495 | switch (regs->gprs[2]) { |
496 | case -ERESTART_RESTARTBLOCK: | |
497 | /* Restart with sys_restart_syscall */ | |
aa33c8cb | 498 | regs->int_code = __NR_restart_syscall; |
20b40a79 MS |
499 | /* fallthrough */ |
500 | case -ERESTARTNOHAND: | |
501 | case -ERESTARTSYS: | |
502 | case -ERESTARTNOINTR: | |
503 | /* Restart system call with magic TIF bit. */ | |
504 | regs->gprs[2] = regs->orig_gpr2; | |
b6ef5bb3 MS |
505 | set_thread_flag(TIF_SYSCALL); |
506 | break; | |
20b40a79 MS |
507 | } |
508 | } | |
509 | ||
54dfe5dd HC |
510 | /* |
511 | * If there's no signal to deliver, we just put the saved sigmask back. | |
512 | */ | |
513 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
514 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
515 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1da177e4 | 516 | } |
1da177e4 | 517 | } |
753c4dd6 MS |
518 | |
519 | void do_notify_resume(struct pt_regs *regs) | |
520 | { | |
521 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
522 | tracehook_notify_resume(regs); | |
ee18d64c DH |
523 | if (current->replacement_session_keyring) |
524 | key_replace_session_keyring(); | |
753c4dd6 | 525 | } |