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Merge branch 'testing' of github.com:ceph/ceph-client into v3.8-rc5-testing
[deliverable/linux.git] / arch / sparc / kernel / signal_64.c
1 /*
2 * arch/sparc64/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11 #ifdef CONFIG_COMPAT
12 #include <linux/compat.h> /* for compat_old_sigset_t */
13 #endif
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/signal.h>
17 #include <linux/errno.h>
18 #include <linux/wait.h>
19 #include <linux/ptrace.h>
20 #include <linux/tracehook.h>
21 #include <linux/unistd.h>
22 #include <linux/mm.h>
23 #include <linux/tty.h>
24 #include <linux/binfmts.h>
25 #include <linux/bitops.h>
26
27 #include <asm/uaccess.h>
28 #include <asm/ptrace.h>
29 #include <asm/pgtable.h>
30 #include <asm/fpumacro.h>
31 #include <asm/uctx.h>
32 #include <asm/siginfo.h>
33 #include <asm/visasm.h>
34 #include <asm/switch_to.h>
35 #include <asm/cacheflush.h>
36
37 #include "entry.h"
38 #include "systbls.h"
39 #include "sigutil.h"
40
41 /* {set, get}context() needed for 64-bit SparcLinux userland. */
42 asmlinkage void sparc64_set_context(struct pt_regs *regs)
43 {
44 struct ucontext __user *ucp = (struct ucontext __user *)
45 regs->u_regs[UREG_I0];
46 mc_gregset_t __user *grp;
47 unsigned long pc, npc, tstate;
48 unsigned long fp, i7;
49 unsigned char fenab;
50 int err;
51
52 flush_user_windows();
53 if (get_thread_wsaved() ||
54 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
55 (!__access_ok(ucp, sizeof(*ucp))))
56 goto do_sigsegv;
57 grp = &ucp->uc_mcontext.mc_gregs;
58 err = __get_user(pc, &((*grp)[MC_PC]));
59 err |= __get_user(npc, &((*grp)[MC_NPC]));
60 if (err || ((pc | npc) & 3))
61 goto do_sigsegv;
62 if (regs->u_regs[UREG_I1]) {
63 sigset_t set;
64
65 if (_NSIG_WORDS == 1) {
66 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
67 goto do_sigsegv;
68 } else {
69 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
70 goto do_sigsegv;
71 }
72 set_current_blocked(&set);
73 }
74 if (test_thread_flag(TIF_32BIT)) {
75 pc &= 0xffffffff;
76 npc &= 0xffffffff;
77 }
78 regs->tpc = pc;
79 regs->tnpc = npc;
80 err |= __get_user(regs->y, &((*grp)[MC_Y]));
81 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
82 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
83 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
84 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
85 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
86 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
87 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
88 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
89 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
90
91 /* Skip %g7 as that's the thread register in userspace. */
92
93 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
94 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
95 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
96 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
97 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
98 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
99 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
100 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
101
102 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
103 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
104 err |= __put_user(fp,
105 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
106 err |= __put_user(i7,
107 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
108
109 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
110 if (fenab) {
111 unsigned long *fpregs = current_thread_info()->fpregs;
112 unsigned long fprs;
113
114 fprs_write(0);
115 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
116 if (fprs & FPRS_DL)
117 err |= copy_from_user(fpregs,
118 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
119 (sizeof(unsigned int) * 32));
120 if (fprs & FPRS_DU)
121 err |= copy_from_user(fpregs+16,
122 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
123 (sizeof(unsigned int) * 32));
124 err |= __get_user(current_thread_info()->xfsr[0],
125 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
126 err |= __get_user(current_thread_info()->gsr[0],
127 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
128 regs->tstate &= ~TSTATE_PEF;
129 }
130 if (err)
131 goto do_sigsegv;
132
133 return;
134 do_sigsegv:
135 force_sig(SIGSEGV, current);
136 }
137
138 asmlinkage void sparc64_get_context(struct pt_regs *regs)
139 {
140 struct ucontext __user *ucp = (struct ucontext __user *)
141 regs->u_regs[UREG_I0];
142 mc_gregset_t __user *grp;
143 mcontext_t __user *mcp;
144 unsigned long fp, i7;
145 unsigned char fenab;
146 int err;
147
148 synchronize_user_stack();
149 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
150 goto do_sigsegv;
151
152 #if 1
153 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
154 #else
155 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
156 #endif
157
158 mcp = &ucp->uc_mcontext;
159 grp = &mcp->mc_gregs;
160
161 /* Skip over the trap instruction, first. */
162 if (test_thread_flag(TIF_32BIT)) {
163 regs->tpc = (regs->tnpc & 0xffffffff);
164 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
165 } else {
166 regs->tpc = regs->tnpc;
167 regs->tnpc += 4;
168 }
169 err = 0;
170 if (_NSIG_WORDS == 1)
171 err |= __put_user(current->blocked.sig[0],
172 (unsigned long __user *)&ucp->uc_sigmask);
173 else
174 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
175 sizeof(sigset_t));
176
177 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
178 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
179 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
180 err |= __put_user(regs->y, &((*grp)[MC_Y]));
181 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
182 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
183 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
184 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
185 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
186 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
187 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
188 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
189 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
190 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
191 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
192 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
193 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
194 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
195 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
196
197 err |= __get_user(fp,
198 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
199 err |= __get_user(i7,
200 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
201 err |= __put_user(fp, &(mcp->mc_fp));
202 err |= __put_user(i7, &(mcp->mc_i7));
203
204 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
205 if (fenab) {
206 unsigned long *fpregs = current_thread_info()->fpregs;
207 unsigned long fprs;
208
209 fprs = current_thread_info()->fpsaved[0];
210 if (fprs & FPRS_DL)
211 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
212 (sizeof(unsigned int) * 32));
213 if (fprs & FPRS_DU)
214 err |= copy_to_user(
215 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
216 (sizeof(unsigned int) * 32));
217 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
218 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
219 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
220 }
221 if (err)
222 goto do_sigsegv;
223
224 return;
225 do_sigsegv:
226 force_sig(SIGSEGV, current);
227 }
228
229 struct rt_signal_frame {
230 struct sparc_stackf ss;
231 siginfo_t info;
232 struct pt_regs regs;
233 __siginfo_fpu_t __user *fpu_save;
234 stack_t stack;
235 sigset_t mask;
236 __siginfo_rwin_t *rwin_save;
237 };
238
239 static long _sigpause_common(old_sigset_t set)
240 {
241 sigset_t blocked;
242 siginitset(&blocked, set);
243 return sigsuspend(&blocked);
244 }
245
246 asmlinkage long sys_sigpause(unsigned int set)
247 {
248 return _sigpause_common(set);
249 }
250
251 asmlinkage long sys_sigsuspend(old_sigset_t set)
252 {
253 return _sigpause_common(set);
254 }
255
256 void do_rt_sigreturn(struct pt_regs *regs)
257 {
258 struct rt_signal_frame __user *sf;
259 unsigned long tpc, tnpc, tstate;
260 __siginfo_fpu_t __user *fpu_save;
261 __siginfo_rwin_t __user *rwin_save;
262 sigset_t set;
263 int err;
264
265 /* Always make any pending restarted system calls return -EINTR */
266 current_thread_info()->restart_block.fn = do_no_restart_syscall;
267
268 synchronize_user_stack ();
269 sf = (struct rt_signal_frame __user *)
270 (regs->u_regs [UREG_FP] + STACK_BIAS);
271
272 /* 1. Make sure we are not getting garbage from the user */
273 if (((unsigned long) sf) & 3)
274 goto segv;
275
276 err = get_user(tpc, &sf->regs.tpc);
277 err |= __get_user(tnpc, &sf->regs.tnpc);
278 if (test_thread_flag(TIF_32BIT)) {
279 tpc &= 0xffffffff;
280 tnpc &= 0xffffffff;
281 }
282 err |= ((tpc | tnpc) & 3);
283
284 /* 2. Restore the state */
285 err |= __get_user(regs->y, &sf->regs.y);
286 err |= __get_user(tstate, &sf->regs.tstate);
287 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
288
289 /* User can only change condition codes and %asi in %tstate. */
290 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
291 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
292
293 err |= __get_user(fpu_save, &sf->fpu_save);
294 if (!err && fpu_save)
295 err |= restore_fpu_state(regs, fpu_save);
296
297 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
298 if (err || do_sigaltstack(&sf->stack, NULL, (unsigned long)sf) == -EFAULT)
299 goto segv;
300
301 err |= __get_user(rwin_save, &sf->rwin_save);
302 if (!err && rwin_save) {
303 if (restore_rwin_state(rwin_save))
304 goto segv;
305 }
306
307 regs->tpc = tpc;
308 regs->tnpc = tnpc;
309
310 /* Prevent syscall restart. */
311 pt_regs_clear_syscall(regs);
312
313 set_current_blocked(&set);
314 return;
315 segv:
316 force_sig(SIGSEGV, current);
317 }
318
319 /* Checks if the fp is valid */
320 static int invalid_frame_pointer(void __user *fp)
321 {
322 if (((unsigned long) fp) & 15)
323 return 1;
324 return 0;
325 }
326
327 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
328 {
329 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
330
331 /*
332 * If we are on the alternate signal stack and would overflow it, don't.
333 * Return an always-bogus address instead so we will die with SIGSEGV.
334 */
335 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
336 return (void __user *) -1L;
337
338 /* This is the X/Open sanctioned signal stack switching. */
339 if (ka->sa.sa_flags & SA_ONSTACK) {
340 if (sas_ss_flags(sp) == 0)
341 sp = current->sas_ss_sp + current->sas_ss_size;
342 }
343
344 sp -= framesize;
345
346 /* Always align the stack frame. This handles two cases. First,
347 * sigaltstack need not be mindful of platform specific stack
348 * alignment. Second, if we took this signal because the stack
349 * is not aligned properly, we'd like to take the signal cleanly
350 * and report that.
351 */
352 sp &= ~15UL;
353
354 return (void __user *) sp;
355 }
356
357 static inline int
358 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
359 int signo, sigset_t *oldset, siginfo_t *info)
360 {
361 struct rt_signal_frame __user *sf;
362 int wsaved, err, sf_size;
363 void __user *tail;
364
365 /* 1. Make sure everything is clean */
366 synchronize_user_stack();
367 save_and_clear_fpu();
368
369 wsaved = get_thread_wsaved();
370
371 sf_size = sizeof(struct rt_signal_frame);
372 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
373 sf_size += sizeof(__siginfo_fpu_t);
374 if (wsaved)
375 sf_size += sizeof(__siginfo_rwin_t);
376 sf = (struct rt_signal_frame __user *)
377 get_sigframe(ka, regs, sf_size);
378
379 if (invalid_frame_pointer (sf))
380 goto sigill;
381
382 tail = (sf + 1);
383
384 /* 2. Save the current process state */
385 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
386
387 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
388 __siginfo_fpu_t __user *fpu_save = tail;
389 tail += sizeof(__siginfo_fpu_t);
390 err |= save_fpu_state(regs, fpu_save);
391 err |= __put_user((u64)fpu_save, &sf->fpu_save);
392 } else {
393 err |= __put_user(0, &sf->fpu_save);
394 }
395 if (wsaved) {
396 __siginfo_rwin_t __user *rwin_save = tail;
397 tail += sizeof(__siginfo_rwin_t);
398 err |= save_rwin_state(wsaved, rwin_save);
399 err |= __put_user((u64)rwin_save, &sf->rwin_save);
400 set_thread_wsaved(0);
401 } else {
402 err |= __put_user(0, &sf->rwin_save);
403 }
404
405 /* Setup sigaltstack */
406 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
407 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
408 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
409
410 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
411
412 if (!wsaved) {
413 err |= copy_in_user((u64 __user *)sf,
414 (u64 __user *)(regs->u_regs[UREG_FP] +
415 STACK_BIAS),
416 sizeof(struct reg_window));
417 } else {
418 struct reg_window *rp;
419
420 rp = &current_thread_info()->reg_window[wsaved - 1];
421 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
422 }
423 if (info)
424 err |= copy_siginfo_to_user(&sf->info, info);
425 else {
426 err |= __put_user(signo, &sf->info.si_signo);
427 err |= __put_user(SI_NOINFO, &sf->info.si_code);
428 }
429 if (err)
430 goto sigsegv;
431
432 /* 3. signal handler back-trampoline and parameters */
433 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
434 regs->u_regs[UREG_I0] = signo;
435 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
436
437 /* The sigcontext is passed in this way because of how it
438 * is defined in GLIBC's /usr/include/bits/sigcontext.h
439 * for sparc64. It includes the 128 bytes of siginfo_t.
440 */
441 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
442
443 /* 5. signal handler */
444 regs->tpc = (unsigned long) ka->sa.sa_handler;
445 regs->tnpc = (regs->tpc + 4);
446 if (test_thread_flag(TIF_32BIT)) {
447 regs->tpc &= 0xffffffff;
448 regs->tnpc &= 0xffffffff;
449 }
450 /* 4. return to kernel instructions */
451 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
452 return 0;
453
454 sigill:
455 do_exit(SIGILL);
456 return -EINVAL;
457
458 sigsegv:
459 force_sigsegv(signo, current);
460 return -EFAULT;
461 }
462
463 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
464 siginfo_t *info,
465 sigset_t *oldset, struct pt_regs *regs)
466 {
467 int err;
468
469 err = setup_rt_frame(ka, regs, signr, oldset,
470 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
471 if (err)
472 return;
473
474 signal_delivered(signr, info, ka, regs, 0);
475 }
476
477 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
478 struct sigaction *sa)
479 {
480 switch (regs->u_regs[UREG_I0]) {
481 case ERESTART_RESTARTBLOCK:
482 case ERESTARTNOHAND:
483 no_system_call_restart:
484 regs->u_regs[UREG_I0] = EINTR;
485 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
486 break;
487 case ERESTARTSYS:
488 if (!(sa->sa_flags & SA_RESTART))
489 goto no_system_call_restart;
490 /* fallthrough */
491 case ERESTARTNOINTR:
492 regs->u_regs[UREG_I0] = orig_i0;
493 regs->tpc -= 4;
494 regs->tnpc -= 4;
495 }
496 }
497
498 /* Note that 'init' is a special process: it doesn't get signals it doesn't
499 * want to handle. Thus you cannot kill init even with a SIGKILL even by
500 * mistake.
501 */
502 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
503 {
504 struct k_sigaction ka;
505 int restart_syscall;
506 sigset_t *oldset = sigmask_to_save();
507 siginfo_t info;
508 int signr;
509
510 /* It's a lot of work and synchronization to add a new ptrace
511 * register for GDB to save and restore in order to get
512 * orig_i0 correct for syscall restarts when debugging.
513 *
514 * Although it should be the case that most of the global
515 * registers are volatile across a system call, glibc already
516 * depends upon that fact that we preserve them. So we can't
517 * just use any global register to save away the orig_i0 value.
518 *
519 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
520 * preserved across a system call trap by various pieces of
521 * code in glibc.
522 *
523 * %g7 is used as the "thread register". %g6 is not used in
524 * any fixed manner. %g6 is used as a scratch register and
525 * a compiler temporary, but it's value is never used across
526 * a system call. Therefore %g6 is usable for orig_i0 storage.
527 */
528 if (pt_regs_is_syscall(regs) &&
529 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
530 regs->u_regs[UREG_G6] = orig_i0;
531
532 #ifdef CONFIG_COMPAT
533 if (test_thread_flag(TIF_32BIT)) {
534 extern void do_signal32(sigset_t *, struct pt_regs *);
535 do_signal32(oldset, regs);
536 return;
537 }
538 #endif
539
540 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
541
542 restart_syscall = 0;
543 if (pt_regs_is_syscall(regs) &&
544 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
545 restart_syscall = 1;
546 orig_i0 = regs->u_regs[UREG_G6];
547 }
548
549 if (signr > 0) {
550 if (restart_syscall)
551 syscall_restart(orig_i0, regs, &ka.sa);
552 handle_signal(signr, &ka, &info, oldset, regs);
553 return;
554 }
555 if (restart_syscall &&
556 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
557 regs->u_regs[UREG_I0] == ERESTARTSYS ||
558 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
559 /* replay the system call when we are done */
560 regs->u_regs[UREG_I0] = orig_i0;
561 regs->tpc -= 4;
562 regs->tnpc -= 4;
563 pt_regs_clear_syscall(regs);
564 }
565 if (restart_syscall &&
566 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
567 regs->u_regs[UREG_G1] = __NR_restart_syscall;
568 regs->tpc -= 4;
569 regs->tnpc -= 4;
570 pt_regs_clear_syscall(regs);
571 }
572
573 /* If there's no signal to deliver, we just put the saved sigmask
574 * back
575 */
576 restore_saved_sigmask();
577 }
578
579 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
580 {
581 if (thread_info_flags & _TIF_SIGPENDING)
582 do_signal(regs, orig_i0);
583 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
584 clear_thread_flag(TIF_NOTIFY_RESUME);
585 tracehook_notify_resume(regs);
586 }
587 }
588
Linux kernel - Deliverables
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