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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> | |
20b40a79 | 33 | #include <asm/compat.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; |
1da177e4 | 62 | |
391c62fe HC |
63 | current->saved_sigmask = current->blocked; |
64 | mask &= _BLOCKABLE; | |
65 | siginitset(&blocked, mask); | |
66 | set_current_blocked(&blocked); | |
0b4d7890 | 67 | set_current_state(TASK_INTERRUPTIBLE); |
54dfe5dd | 68 | schedule(); |
9e8ed3ae | 69 | set_restore_sigmask(); |
54dfe5dd | 70 | return -ERESTARTNOHAND; |
1da177e4 LT |
71 | } |
72 | ||
26689452 HC |
73 | SYSCALL_DEFINE3(sigaction, int, sig, const struct old_sigaction __user *, act, |
74 | struct old_sigaction __user *, oact) | |
1da177e4 LT |
75 | { |
76 | struct k_sigaction new_ka, old_ka; | |
77 | int ret; | |
78 | ||
79 | if (act) { | |
80 | old_sigset_t mask; | |
81 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
82 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
12bae235 HC |
83 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
84 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
85 | __get_user(mask, &act->sa_mask)) | |
1da177e4 | 86 | return -EFAULT; |
1da177e4 LT |
87 | siginitset(&new_ka.sa.sa_mask, mask); |
88 | } | |
89 | ||
90 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
91 | ||
92 | if (!ret && oact) { | |
93 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
94 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
12bae235 HC |
95 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
96 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
97 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
1da177e4 | 98 | return -EFAULT; |
1da177e4 LT |
99 | } |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
26689452 HC |
104 | SYSCALL_DEFINE2(sigaltstack, const stack_t __user *, uss, |
105 | stack_t __user *, uoss) | |
1da177e4 | 106 | { |
03ff9a23 | 107 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
108 | return do_sigaltstack(uss, uoss, regs->gprs[15]); |
109 | } | |
110 | ||
1da177e4 LT |
111 | /* Returns non-zero on fault. */ |
112 | static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs) | |
113 | { | |
6837a8c3 GS |
114 | _sigregs user_sregs; |
115 | ||
1da177e4 LT |
116 | save_access_regs(current->thread.acrs); |
117 | ||
118 | /* Copy a 'clean' PSW mask to the user to avoid leaking | |
119 | information about whether PER is currently on. */ | |
c1821c2e | 120 | user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask); |
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; | |
b05e3703 MS |
147 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, |
148 | user_sregs.regs.psw.mask); | |
149 | regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr; | |
150 | memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs)); | |
6837a8c3 GS |
151 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, |
152 | sizeof(sregs->regs.acrs)); | |
1da177e4 LT |
153 | restore_access_regs(current->thread.acrs); |
154 | ||
6837a8c3 GS |
155 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
156 | sizeof(s390_fp_regs)); | |
1da177e4 | 157 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; |
1da177e4 LT |
158 | |
159 | restore_fp_regs(¤t->thread.fp_regs); | |
20b40a79 | 160 | regs->svc_code = 0; /* disable syscall checks */ |
1da177e4 LT |
161 | return 0; |
162 | } | |
163 | ||
26689452 | 164 | SYSCALL_DEFINE0(sigreturn) |
1da177e4 | 165 | { |
03ff9a23 | 166 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
167 | sigframe __user *frame = (sigframe __user *)regs->gprs[15]; |
168 | sigset_t set; | |
169 | ||
170 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
171 | goto badframe; | |
172 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE)) | |
173 | goto badframe; | |
1da177e4 | 174 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 175 | set_current_blocked(&set); |
1da177e4 LT |
176 | if (restore_sigregs(regs, &frame->sregs)) |
177 | goto badframe; | |
1da177e4 | 178 | return regs->gprs[2]; |
1da177e4 LT |
179 | badframe: |
180 | force_sig(SIGSEGV, current); | |
181 | return 0; | |
182 | } | |
183 | ||
26689452 | 184 | SYSCALL_DEFINE0(rt_sigreturn) |
1da177e4 | 185 | { |
03ff9a23 | 186 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
187 | rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15]; |
188 | sigset_t set; | |
189 | ||
190 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
191 | goto badframe; | |
192 | if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set))) | |
193 | goto badframe; | |
1da177e4 | 194 | sigdelsetmask(&set, ~_BLOCKABLE); |
391c62fe | 195 | set_current_blocked(&set); |
1da177e4 LT |
196 | if (restore_sigregs(regs, &frame->uc.uc_mcontext)) |
197 | goto badframe; | |
4e3df37e CLG |
198 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, |
199 | regs->gprs[15]) == -EFAULT) | |
200 | goto badframe; | |
1da177e4 | 201 | return regs->gprs[2]; |
1da177e4 LT |
202 | badframe: |
203 | force_sig(SIGSEGV, current); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | /* | |
208 | * Set up a signal frame. | |
209 | */ | |
210 | ||
211 | ||
212 | /* | |
213 | * Determine which stack to use.. | |
214 | */ | |
215 | static inline void __user * | |
216 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
217 | { | |
218 | unsigned long sp; | |
219 | ||
220 | /* Default to using normal stack */ | |
221 | sp = regs->gprs[15]; | |
222 | ||
de553438 HC |
223 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
224 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) | |
225 | return (void __user *) -1UL; | |
226 | ||
1da177e4 LT |
227 | /* This is the X/Open sanctioned signal stack switching. */ |
228 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
229 | if (! sas_ss_flags(sp)) | |
230 | sp = current->sas_ss_sp + current->sas_ss_size; | |
231 | } | |
232 | ||
233 | /* This is the legacy signal stack switching. */ | |
234 | else if (!user_mode(regs) && | |
235 | !(ka->sa.sa_flags & SA_RESTORER) && | |
236 | ka->sa.sa_restorer) { | |
237 | sp = (unsigned long) ka->sa.sa_restorer; | |
238 | } | |
239 | ||
240 | return (void __user *)((sp - frame_size) & -8ul); | |
241 | } | |
242 | ||
243 | static inline int map_signal(int sig) | |
244 | { | |
245 | if (current_thread_info()->exec_domain | |
246 | && current_thread_info()->exec_domain->signal_invmap | |
247 | && sig < 32) | |
248 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
249 | else | |
250 | return sig; | |
251 | } | |
252 | ||
54dfe5dd HC |
253 | static int setup_frame(int sig, struct k_sigaction *ka, |
254 | sigset_t *set, struct pt_regs * regs) | |
1da177e4 LT |
255 | { |
256 | sigframe __user *frame; | |
257 | ||
258 | frame = get_sigframe(ka, regs, sizeof(sigframe)); | |
259 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe))) | |
260 | goto give_sigsegv; | |
261 | ||
de553438 HC |
262 | if (frame == (void __user *) -1UL) |
263 | goto give_sigsegv; | |
264 | ||
1da177e4 LT |
265 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE)) |
266 | goto give_sigsegv; | |
267 | ||
268 | if (save_sigregs(regs, &frame->sregs)) | |
269 | goto give_sigsegv; | |
270 | if (__put_user(&frame->sregs, &frame->sc.sregs)) | |
271 | goto give_sigsegv; | |
272 | ||
273 | /* Set up to return from userspace. If provided, use a stub | |
274 | already in userspace. */ | |
275 | if (ka->sa.sa_flags & SA_RESTORER) { | |
276 | regs->gprs[14] = (unsigned long) | |
277 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
278 | } else { | |
279 | regs->gprs[14] = (unsigned long) | |
280 | frame->retcode | PSW_ADDR_AMODE; | |
281 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
282 | (u16 __user *)(frame->retcode))) | |
283 | goto give_sigsegv; | |
284 | } | |
285 | ||
286 | /* Set up backchain. */ | |
287 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
288 | goto give_sigsegv; | |
289 | ||
290 | /* Set up registers for signal handler */ | |
291 | regs->gprs[15] = (unsigned long) frame; | |
292 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
293 | ||
294 | regs->gprs[2] = map_signal(sig); | |
295 | regs->gprs[3] = (unsigned long) &frame->sc; | |
296 | ||
297 | /* We forgot to include these in the sigcontext. | |
298 | To avoid breaking binary compatibility, they are passed as args. */ | |
299 | regs->gprs[4] = current->thread.trap_no; | |
300 | regs->gprs[5] = current->thread.prot_addr; | |
86f2552b | 301 | regs->gprs[6] = task_thread_info(current)->last_break; |
1da177e4 LT |
302 | |
303 | /* Place signal number on stack to allow backtrace from handler. */ | |
304 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
305 | goto give_sigsegv; | |
54dfe5dd | 306 | return 0; |
1da177e4 LT |
307 | |
308 | give_sigsegv: | |
309 | force_sigsegv(sig, current); | |
54dfe5dd | 310 | return -EFAULT; |
1da177e4 LT |
311 | } |
312 | ||
54dfe5dd | 313 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
1da177e4 LT |
314 | sigset_t *set, struct pt_regs * regs) |
315 | { | |
316 | int err = 0; | |
317 | rt_sigframe __user *frame; | |
318 | ||
319 | frame = get_sigframe(ka, regs, sizeof(rt_sigframe)); | |
320 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe))) | |
321 | goto give_sigsegv; | |
322 | ||
de553438 HC |
323 | if (frame == (void __user *) -1UL) |
324 | goto give_sigsegv; | |
325 | ||
1da177e4 LT |
326 | if (copy_siginfo_to_user(&frame->info, info)) |
327 | goto give_sigsegv; | |
328 | ||
329 | /* Create the ucontext. */ | |
330 | err |= __put_user(0, &frame->uc.uc_flags); | |
c2814476 AV |
331 | err |= __put_user(NULL, &frame->uc.uc_link); |
332 | err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
1da177e4 LT |
333 | err |= __put_user(sas_ss_flags(regs->gprs[15]), |
334 | &frame->uc.uc_stack.ss_flags); | |
335 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
336 | err |= save_sigregs(regs, &frame->uc.uc_mcontext); | |
337 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
338 | if (err) | |
339 | goto give_sigsegv; | |
340 | ||
341 | /* Set up to return from userspace. If provided, use a stub | |
342 | already in userspace. */ | |
343 | if (ka->sa.sa_flags & SA_RESTORER) { | |
344 | regs->gprs[14] = (unsigned long) | |
345 | ka->sa.sa_restorer | PSW_ADDR_AMODE; | |
346 | } else { | |
347 | regs->gprs[14] = (unsigned long) | |
348 | frame->retcode | PSW_ADDR_AMODE; | |
b44df334 HC |
349 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, |
350 | (u16 __user *)(frame->retcode))) | |
351 | goto give_sigsegv; | |
1da177e4 LT |
352 | } |
353 | ||
354 | /* Set up backchain. */ | |
355 | if (__put_user(regs->gprs[15], (addr_t __user *) frame)) | |
356 | goto give_sigsegv; | |
357 | ||
358 | /* Set up registers for signal handler */ | |
359 | regs->gprs[15] = (unsigned long) frame; | |
360 | regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE; | |
361 | ||
362 | regs->gprs[2] = map_signal(sig); | |
363 | regs->gprs[3] = (unsigned long) &frame->info; | |
364 | regs->gprs[4] = (unsigned long) &frame->uc; | |
86f2552b | 365 | regs->gprs[5] = task_thread_info(current)->last_break; |
54dfe5dd | 366 | return 0; |
1da177e4 LT |
367 | |
368 | give_sigsegv: | |
369 | force_sigsegv(sig, current); | |
54dfe5dd | 370 | return -EFAULT; |
1da177e4 LT |
371 | } |
372 | ||
391c62fe HC |
373 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
374 | siginfo_t *info, sigset_t *oldset, | |
375 | struct pt_regs *regs) | |
1da177e4 | 376 | { |
391c62fe | 377 | sigset_t blocked; |
54dfe5dd HC |
378 | int ret; |
379 | ||
1da177e4 LT |
380 | /* Set up the stack frame */ |
381 | if (ka->sa.sa_flags & SA_SIGINFO) | |
54dfe5dd | 382 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 383 | else |
54dfe5dd | 384 | ret = setup_frame(sig, ka, oldset, regs); |
391c62fe HC |
385 | if (ret) |
386 | return ret; | |
387 | sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); | |
388 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
389 | sigaddset(&blocked, sig); | |
390 | set_current_blocked(&blocked); | |
391 | return 0; | |
1da177e4 LT |
392 | } |
393 | ||
394 | /* | |
395 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
396 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
397 | * mistake. | |
398 | * | |
399 | * Note that we go through the signals twice: once to check the signals that | |
400 | * the kernel can handle, and then we build all the user-level signal handling | |
401 | * stack-frames in one go after that. | |
402 | */ | |
54dfe5dd | 403 | void do_signal(struct pt_regs *regs) |
1da177e4 | 404 | { |
1da177e4 LT |
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 | ||
20b40a79 MS |
424 | /* |
425 | * Get signal to deliver. When running under ptrace, at this point | |
426 | * the debugger may change all our registers, including the system | |
427 | * call information. | |
428 | */ | |
429 | current_thread_info()->system_call = regs->svc_code; | |
1da177e4 | 430 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
20b40a79 | 431 | regs->svc_code = current_thread_info()->system_call; |
1da177e4 LT |
432 | |
433 | if (signr > 0) { | |
434 | /* Whee! Actually deliver the signal. */ | |
20b40a79 MS |
435 | if (regs->svc_code > 0) { |
436 | /* Check for system call restarting. */ | |
437 | switch (regs->gprs[2]) { | |
438 | case -ERESTART_RESTARTBLOCK: | |
439 | case -ERESTARTNOHAND: | |
440 | regs->gprs[2] = -EINTR; | |
441 | break; | |
442 | case -ERESTARTSYS: | |
443 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
444 | regs->gprs[2] = -EINTR; | |
445 | break; | |
446 | } | |
447 | /* fallthrough */ | |
448 | case -ERESTARTNOINTR: | |
449 | regs->gprs[2] = regs->orig_gpr2; | |
450 | regs->psw.addr = regs->psw.addr - | |
451 | (regs->svc_code >> 16); | |
452 | break; | |
453 | } | |
454 | /* No longer in a system call */ | |
455 | regs->svc_code = 0; | |
456 | } | |
457 | ||
458 | if ((is_compat_task() ? | |
459 | handle_signal32(signr, &ka, &info, oldset, regs) : | |
460 | handle_signal(signr, &ka, &info, oldset, regs)) == 0) { | |
54dfe5dd HC |
461 | /* |
462 | * A signal was successfully delivered; the saved | |
463 | * sigmask will have been stored in the signal frame, | |
464 | * and will be restored by sigreturn, so we can simply | |
465 | * clear the TIF_RESTORE_SIGMASK flag. | |
466 | */ | |
467 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
468 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
0ac30be4 | 469 | |
753c4dd6 MS |
470 | /* |
471 | * Let tracing know that we've done the handler setup. | |
472 | */ | |
473 | tracehook_signal_handler(signr, &info, &ka, regs, | |
20b40a79 | 474 | test_thread_flag(TIF_SINGLE_STEP)); |
54dfe5dd HC |
475 | } |
476 | return; | |
477 | } | |
478 | ||
20b40a79 MS |
479 | /* No handlers present - check for system call restart */ |
480 | if (regs->svc_code > 0) { | |
481 | switch (regs->gprs[2]) { | |
482 | case -ERESTART_RESTARTBLOCK: | |
483 | /* Restart with sys_restart_syscall */ | |
484 | regs->svc_code = __NR_restart_syscall; | |
485 | /* fallthrough */ | |
486 | case -ERESTARTNOHAND: | |
487 | case -ERESTARTSYS: | |
488 | case -ERESTARTNOINTR: | |
489 | /* Restart system call with magic TIF bit. */ | |
490 | regs->gprs[2] = regs->orig_gpr2; | |
491 | set_thread_flag(TIF_RESTART_SVC); | |
492 | break; | |
493 | } | |
494 | } | |
495 | ||
54dfe5dd HC |
496 | /* |
497 | * If there's no signal to deliver, we just put the saved sigmask back. | |
498 | */ | |
499 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
500 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
501 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1da177e4 | 502 | } |
1da177e4 | 503 | } |
753c4dd6 MS |
504 | |
505 | void do_notify_resume(struct pt_regs *regs) | |
506 | { | |
507 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
508 | tracehook_notify_resume(regs); | |
ee18d64c DH |
509 | if (current->replacement_session_keyring) |
510 | key_replace_session_keyring(); | |
753c4dd6 | 511 | } |