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> | |
a0616cde | 33 | #include <asm/switch_to.h> |
a806170e | 34 | #include "entry.h" |
1da177e4 LT |
35 | |
36 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
37 | ||
38 | ||
39 | typedef struct | |
40 | { | |
41 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
42 | struct sigcontext sc; | |
43 | _sigregs sregs; | |
44 | int signo; | |
45 | __u8 retcode[S390_SYSCALL_SIZE]; | |
46 | } sigframe; | |
47 | ||
48 | typedef struct | |
49 | { | |
50 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE]; | |
51 | __u8 retcode[S390_SYSCALL_SIZE]; | |
52 | struct siginfo info; | |
53 | struct ucontext uc; | |
54 | } rt_sigframe; | |
55 | ||
1da177e4 LT |
56 | /* |
57 | * Atomically swap in the new signal mask, and wait for a signal. | |
58 | */ | |
26689452 | 59 | SYSCALL_DEFINE3(sigsuspend, int, history0, int, history1, old_sigset_t, mask) |
1da177e4 | 60 | { |
391c62fe | 61 | sigset_t blocked; |
391c62fe | 62 | siginitset(&blocked, mask); |
68f3f16d | 63 | return sigsuspend(&blocked); |
1da177e4 LT |
64 | } |
65 | ||
26689452 HC |
66 | SYSCALL_DEFINE3(sigaction, int, sig, const struct old_sigaction __user *, act, |
67 | struct old_sigaction __user *, oact) | |
1da177e4 LT |
68 | { |
69 | struct k_sigaction new_ka, old_ka; | |
70 | int ret; | |
71 | ||
72 | if (act) { | |
73 | old_sigset_t mask; | |
74 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
75 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
12bae235 HC |
76 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
77 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
78 | __get_user(mask, &act->sa_mask)) | |
1da177e4 | 79 | return -EFAULT; |
1da177e4 LT |
80 | siginitset(&new_ka.sa.sa_mask, mask); |
81 | } | |
82 | ||
83 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
84 | ||
85 | if (!ret && oact) { | |
86 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
87 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
12bae235 HC |
88 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
89 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
90 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
1da177e4 | 91 | return -EFAULT; |
1da177e4 LT |
92 | } |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
26689452 HC |
97 | SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss, |
98 | stack_t __user *, uoss) | |
1da177e4 | 99 | { |
03ff9a23 | 100 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
101 | return do_sigaltstack(uss, uoss, regs->gprs[15]); |
102 | } | |
103 | ||
1da177e4 LT |
104 | /* Returns non-zero on fault. */ |
105 | static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
106 | { | |
6837a8c3 GS |
107 | _sigregs user_sregs; |
108 | ||
1da177e4 LT |
109 | save_access_regs(current->thread.acrs); |
110 | ||
111 | /* Copy a 'clean' PSW mask to the user to avoid leaking | |
112 | information about whether PER is currently on. */ | |
d4e81b35 MS |
113 | user_sregs.regs.psw.mask = psw_user_bits | |
114 | (regs->psw.mask & PSW_MASK_USER); | |
b05e3703 MS |
115 | user_sregs.regs.psw.addr = regs->psw.addr; |
116 | memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
117 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
118 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
119 | /* |
120 | * We have to store the fp registers to current->thread.fp_regs | |
121 | * to merge them with the emulated registers. | |
122 | */ | |
123 | save_fp_regs(¤t->thread.fp_regs); | |
6837a8c3 GS |
124 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
125 | sizeof(s390_fp_regs)); | |
126 | return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs)); | |
1da177e4 LT |
127 | } |
128 | ||
129 | /* Returns positive number on error */ | |
130 | static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
131 | { | |
1da177e4 | 132 | int err; |
6837a8c3 | 133 | _sigregs user_sregs; |
1da177e4 LT |
134 | |
135 | /* Alwys make any pending restarted system call return -EINTR */ | |
136 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
137 | ||
6837a8c3 | 138 | err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs)); |
1da177e4 LT |
139 | if (err) |
140 | return err; | |
d4e81b35 | 141 | /* Use regs->psw.mask instead of psw_user_bits to preserve PER bit. */ |
b50511e4 | 142 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 MS |
143 | (user_sregs.regs.psw.mask & PSW_MASK_USER); |
144 | /* Check for invalid amode */ | |
145 | if (regs->psw.mask & PSW_MASK_EA) | |
146 | regs->psw.mask |= PSW_MASK_BA; | |
147 | regs->psw.addr = user_sregs.regs.psw.addr; | |
b05e3703 | 148 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); |
6837a8c3 GS |
149 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
150 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
151 | restore_access_regs(current->thread.acrs); |
152 | ||
6837a8c3 GS |
153 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
154 | sizeof(s390_fp_regs)); | |
1da177e4 | 155 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
1da177e4 LT |
156 | |
157 | restore_fp_regs(¤t->thread.fp_regs); | |
b6ef5bb3 | 158 | clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */ |
1da177e4 LT |
159 | return 0; |
160 | } | |
161 | ||
26689452 | 162 | SYSCALL_DEFINE0(sigreturn) |
1da177e4 | 163 | { |
03ff9a23 | 164 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
165 | sigframe __user *frame = (sigframe __user *)regs->gprs[15]; |
166 | sigset_t set; | |
167 | ||
168 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
169 | goto badframe; | |
170 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) | |
171 | goto badframe; | |
1da177e4 | 172 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 173 | set_current_blocked(&set); |
1da177e4 LT |
174 | if (restore_sigregs(regs, &frame->sregs)) |
175 | goto badframe; | |
1da177e4 | 176 | return regs->gprs[2]; |
1da177e4 LT |
177 | badframe: |
178 | force_sig(SIGSEGV, current); | |
179 | return 0; | |
180 | } | |
181 | ||
26689452 | 182 | SYSCALL_DEFINE0(rt_sigreturn) |
1da177e4 | 183 | { |
03ff9a23 | 184 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
185 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; |
186 | sigset_t set; | |
187 | ||
188 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
189 | goto badframe; | |
190 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) | |
191 | goto badframe; | |
1da177e4 | 192 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 193 | set_current_blocked(&set); |
1da177e4 LT |
194 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) |
195 | goto badframe; | |
4e3df37e CLG |
196 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
197 | regs->gprs[15]) == -EFAULT) | |
198 | goto badframe; | |
1da177e4 | 199 | return regs->gprs[2]; |
1da177e4 LT |
200 | badframe: |
201 | force_sig(SIGSEGV, current); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Set up a signal frame. | |
207 | */ | |
208 | ||
209 | ||
210 | /* | |
211 | * Determine which stack to use.. | |
212 | */ | |
213 | static inline void __user * | |
214 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
215 | { | |
216 | unsigned long sp; | |
217 | ||
218 | /* Default to using normal stack */ | |
219 | sp = regs->gprs[15]; | |
220 | ||
de553438 HC |
221 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
222 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) | |
223 | return (void __user *) -1UL; | |
224 | ||
1da177e4 LT |
225 | /* This is the X/Open sanctioned signal stack switching. */ |
226 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
227 | if (! sas_ss_flags(sp)) | |
228 | sp = current->sas_ss_sp + current->sas_ss_size; | |
229 | } | |
230 | ||
1da177e4 LT |
231 | return (void __user *)((sp - frame_size) & -8ul); |
232 | } | |
233 | ||
234 | static inline int map_signal(int sig) | |
235 | { | |
236 | if (current_thread_info()->exec_domain | |
237 | && current_thread_info()->exec_domain->signal_invmap | |
238 | && sig < 32) | |
239 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
240 | else | |
241 | return sig; | |
242 | } | |
243 | ||
54dfe5dd HC |
244 | static int setup_frame(int sig, struct k_sigaction *ka, |
245 | sigset_t *set, struct pt_regs * regs) | |
1da177e4 LT |
246 | { |
247 | sigframe __user *frame; | |
248 | ||
249 | frame = get_sigframe(ka, regs, sizeof(sigframe)); | |
250 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) | |
251 | goto give_sigsegv; | |
252 | ||
de553438 HC |
253 | if (frame == (void __user *) -1UL) |
254 | goto give_sigsegv; | |
255 | ||
1da177e4 LT |
256 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) |
257 | goto give_sigsegv; | |
258 | ||
259 | if (save_sigregs(regs, &frame->sregs)) | |
260 | goto give_sigsegv; | |
261 | if (__put_user(&frame->sregs, &frame->sc.sregs)) | |
262 | goto give_sigsegv; | |
263 | ||
264 | /* Set up to return from userspace. If provided, use a stub | |
265 | already in userspace. */ | |
266 | if (ka->sa.sa_flags & SA_RESTORER) { | |
267 | regs->gprs[14] = (unsigned long) | |
268 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
269 | } else { | |
270 | regs->gprs[14] = (unsigned long) | |
271 | frame->retcode | PSW_ADDR_AMODE; | |
272 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
273 | (u16 __user *)(frame->retcode))) | |
274 | goto give_sigsegv; | |
275 | } | |
276 | ||
277 | /* Set up backchain. */ | |
278 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
279 | goto give_sigsegv; | |
280 | ||
281 | /* Set up registers for signal handler */ | |
282 | regs->gprs[15] = (unsigned long) frame; | |
d4e81b35 | 283 | regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA; /* 64 bit amode */ |
1da177e4 LT |
284 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; |
285 | ||
286 | regs->gprs[2] = map_signal(sig); | |
287 | regs->gprs[3] = (unsigned long) &frame->sc; | |
288 | ||
289 | /* We forgot to include these in the sigcontext. | |
290 | To avoid breaking binary compatibility, they are passed as args. */ | |
aa33c8cb MS |
291 | if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || |
292 | sig == SIGTRAP || sig == SIGFPE) { | |
293 | /* set extra registers only for synchronous signals */ | |
294 | regs->gprs[4] = regs->int_code & 127; | |
295 | regs->gprs[5] = regs->int_parm_long; | |
296 | regs->gprs[6] = task_thread_info(current)->last_break; | |
297 | } | |
1da177e4 LT |
298 | |
299 | /* Place signal number on stack to allow backtrace from handler. */ | |
300 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
301 | goto give_sigsegv; | |
54dfe5dd | 302 | return 0; |
1da177e4 LT |
303 | |
304 | give_sigsegv: | |
305 | force_sigsegv(sig, current); | |
54dfe5dd | 306 | return -EFAULT; |
1da177e4 LT |
307 | } |
308 | ||
54dfe5dd | 309 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
310 | sigset_t *set, struct pt_regs * regs) |
311 | { | |
312 | int err = 0; | |
313 | rt_sigframe __user *frame; | |
314 | ||
315 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); | |
316 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) | |
317 | goto give_sigsegv; | |
318 | ||
de553438 HC |
319 | if (frame == (void __user *) -1UL) |
320 | goto give_sigsegv; | |
321 | ||
1da177e4 LT |
322 | if (copy_siginfo_to_user(&frame->info, info)) |
323 | goto give_sigsegv; | |
324 | ||
325 | /* Create the ucontext. */ | |
326 | err |= __put_user(0, &frame->uc.uc_flags); | |
c2814476 AV |
327 | err |= __put_user(NULL, &frame->uc.uc_link); |
328 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
1da177e4 LT |
329 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
330 | &frame->uc.uc_stack.ss_flags); | |
331 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
332 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); | |
333 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
334 | if (err) | |
335 | goto give_sigsegv; | |
336 | ||
337 | /* Set up to return from userspace. If provided, use a stub | |
338 | already in userspace. */ | |
339 | if (ka->sa.sa_flags & SA_RESTORER) { | |
340 | regs->gprs[14] = (unsigned long) | |
341 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
342 | } else { | |
343 | regs->gprs[14] = (unsigned long) | |
344 | frame->retcode | PSW_ADDR_AMODE; | |
b44df334 HC |
345 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
346 | (u16 __user *)(frame->retcode))) | |
347 | goto give_sigsegv; | |
1da177e4 LT |
348 | } |
349 | ||
350 | /* Set up backchain. */ | |
351 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
352 | goto give_sigsegv; | |
353 | ||
354 | /* Set up registers for signal handler */ | |
355 | regs->gprs[15] = (unsigned long) frame; | |
d4e81b35 | 356 | regs->psw.mask |= PSW_MASK_EA | PSW_MASK_BA; /* 64 bit amode */ |
1da177e4 LT |
357 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; |
358 | ||
359 | regs->gprs[2] = map_signal(sig); | |
360 | regs->gprs[3] = (unsigned long) &frame->info; | |
361 | regs->gprs[4] = (unsigned long) &frame->uc; | |
86f2552b | 362 | regs->gprs[5] = task_thread_info(current)->last_break; |
54dfe5dd | 363 | return 0; |
1da177e4 LT |
364 | |
365 | give_sigsegv: | |
366 | force_sigsegv(sig, current); | |
54dfe5dd | 367 | return -EFAULT; |
1da177e4 LT |
368 | } |
369 | ||
391c62fe HC |
370 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
371 | siginfo_t *info, sigset_t *oldset, | |
372 | struct pt_regs *regs) | |
1da177e4 | 373 | { |
54dfe5dd HC |
374 | int ret; |
375 | ||
1da177e4 LT |
376 | /* Set up the stack frame */ |
377 | if (ka->sa.sa_flags & SA_SIGINFO) | |
54dfe5dd | 378 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 379 | else |
54dfe5dd | 380 | ret = setup_frame(sig, ka, oldset, regs); |
391c62fe HC |
381 | if (ret) |
382 | return ret; | |
ad252ffa | 383 | block_sigmask(ka, sig); |
391c62fe | 384 | return 0; |
1da177e4 LT |
385 | } |
386 | ||
387 | /* | |
388 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
389 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
390 | * mistake. | |
391 | * | |
392 | * Note that we go through the signals twice: once to check the signals that | |
393 | * the kernel can handle, and then we build all the user-level signal handling | |
394 | * stack-frames in one go after that. | |
395 | */ | |
54dfe5dd | 396 | void do_signal(struct pt_regs *regs) |
1da177e4 | 397 | { |
1da177e4 LT |
398 | siginfo_t info; |
399 | int signr; | |
400 | struct k_sigaction ka; | |
54dfe5dd | 401 | sigset_t *oldset; |
1da177e4 | 402 | |
54dfe5dd HC |
403 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
404 | oldset = ¤t->saved_sigmask; | |
405 | else | |
1da177e4 LT |
406 | oldset = ¤t->blocked; |
407 | ||
20b40a79 MS |
408 | /* |
409 | * Get signal to deliver. When running under ptrace, at this point | |
410 | * the debugger may change all our registers, including the system | |
411 | * call information. | |
412 | */ | |
b6ef5bb3 | 413 | current_thread_info()->system_call = |
aa33c8cb | 414 | test_thread_flag(TIF_SYSCALL) ? regs->int_code : 0; |
1da177e4 | 415 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
1da177e4 LT |
416 | |
417 | if (signr > 0) { | |
418 | /* Whee! Actually deliver the signal. */ | |
b6ef5bb3 | 419 | if (current_thread_info()->system_call) { |
aa33c8cb | 420 | regs->int_code = current_thread_info()->system_call; |
20b40a79 MS |
421 | /* Check for system call restarting. */ |
422 | switch (regs->gprs[2]) { | |
423 | case -ERESTART_RESTARTBLOCK: | |
424 | case -ERESTARTNOHAND: | |
425 | regs->gprs[2] = -EINTR; | |
426 | break; | |
427 | case -ERESTARTSYS: | |
428 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
429 | regs->gprs[2] = -EINTR; | |
430 | break; | |
431 | } | |
432 | /* fallthrough */ | |
433 | case -ERESTARTNOINTR: | |
434 | regs->gprs[2] = regs->orig_gpr2; | |
ccf45caf MS |
435 | regs->psw.addr = |
436 | __rewind_psw(regs->psw, | |
aa33c8cb | 437 | regs->int_code >> 16); |
20b40a79 MS |
438 | break; |
439 | } | |
20b40a79 | 440 | } |
d9ae6772 MS |
441 | /* No longer in a system call */ |
442 | clear_thread_flag(TIF_SYSCALL); | |
20b40a79 MS |
443 | |
444 | if ((is_compat_task() ? | |
445 | handle_signal32(signr, &ka, &info, oldset, regs) : | |
446 | handle_signal(signr, &ka, &info, oldset, regs)) == 0) { | |
54dfe5dd HC |
447 | /* |
448 | * A signal was successfully delivered; the saved | |
449 | * sigmask will have been stored in the signal frame, | |
450 | * and will be restored by sigreturn, so we can simply | |
451 | * clear the TIF_RESTORE_SIGMASK flag. | |
452 | */ | |
453 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
454 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
0ac30be4 | 455 | |
753c4dd6 MS |
456 | /* |
457 | * Let tracing know that we've done the handler setup. | |
458 | */ | |
459 | tracehook_signal_handler(signr, &info, &ka, regs, | |
20b40a79 | 460 | test_thread_flag(TIF_SINGLE_STEP)); |
54dfe5dd HC |
461 | } |
462 | return; | |
463 | } | |
464 | ||
20b40a79 | 465 | /* No handlers present - check for system call restart */ |
d9ae6772 | 466 | clear_thread_flag(TIF_SYSCALL); |
b6ef5bb3 | 467 | if (current_thread_info()->system_call) { |
aa33c8cb | 468 | regs->int_code = current_thread_info()->system_call; |
20b40a79 MS |
469 | switch (regs->gprs[2]) { |
470 | case -ERESTART_RESTARTBLOCK: | |
471 | /* Restart with sys_restart_syscall */ | |
aa33c8cb | 472 | regs->int_code = __NR_restart_syscall; |
20b40a79 MS |
473 | /* fallthrough */ |
474 | case -ERESTARTNOHAND: | |
475 | case -ERESTARTSYS: | |
476 | case -ERESTARTNOINTR: | |
477 | /* Restart system call with magic TIF bit. */ | |
478 | regs->gprs[2] = regs->orig_gpr2; | |
b6ef5bb3 MS |
479 | set_thread_flag(TIF_SYSCALL); |
480 | break; | |
20b40a79 MS |
481 | } |
482 | } | |
483 | ||
54dfe5dd HC |
484 | /* |
485 | * If there's no signal to deliver, we just put the saved sigmask back. | |
486 | */ | |
51a7b448 | 487 | restore_saved_sigmask(); |
1da177e4 | 488 | } |
753c4dd6 MS |
489 | |
490 | void do_notify_resume(struct pt_regs *regs) | |
491 | { | |
492 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
493 | tracehook_notify_resume(regs); | |
494 | } |