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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[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
35 #include "entry.h"
36 #include "systbls.h"
37
38 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
39
40 /* {set, get}context() needed for 64-bit SparcLinux userland. */
41 asmlinkage void sparc64_set_context(struct pt_regs *regs)
42 {
43 struct ucontext __user *ucp = (struct ucontext __user *)
44 regs->u_regs[UREG_I0];
45 mc_gregset_t __user *grp;
46 unsigned long pc, npc, tstate;
47 unsigned long fp, i7;
48 unsigned char fenab;
49 int err;
50
51 flush_user_windows();
52 if (get_thread_wsaved() ||
53 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
54 (!__access_ok(ucp, sizeof(*ucp))))
55 goto do_sigsegv;
56 grp = &ucp->uc_mcontext.mc_gregs;
57 err = __get_user(pc, &((*grp)[MC_PC]));
58 err |= __get_user(npc, &((*grp)[MC_NPC]));
59 if (err || ((pc | npc) & 3))
60 goto do_sigsegv;
61 if (regs->u_regs[UREG_I1]) {
62 sigset_t set;
63
64 if (_NSIG_WORDS == 1) {
65 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
66 goto do_sigsegv;
67 } else {
68 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
69 goto do_sigsegv;
70 }
71 sigdelsetmask(&set, ~_BLOCKABLE);
72 spin_lock_irq(&current->sighand->siglock);
73 current->blocked = set;
74 recalc_sigpending();
75 spin_unlock_irq(&current->sighand->siglock);
76 }
77 if (test_thread_flag(TIF_32BIT)) {
78 pc &= 0xffffffff;
79 npc &= 0xffffffff;
80 }
81 regs->tpc = pc;
82 regs->tnpc = npc;
83 err |= __get_user(regs->y, &((*grp)[MC_Y]));
84 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
85 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
86 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
87 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
88 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
89 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
90 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
91 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
92 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
93
94 /* Skip %g7 as that's the thread register in userspace. */
95
96 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
97 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
98 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
99 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
100 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
101 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
102 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
103 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
104
105 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
106 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
107 err |= __put_user(fp,
108 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
109 err |= __put_user(i7,
110 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
111
112 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
113 if (fenab) {
114 unsigned long *fpregs = current_thread_info()->fpregs;
115 unsigned long fprs;
116
117 fprs_write(0);
118 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
119 if (fprs & FPRS_DL)
120 err |= copy_from_user(fpregs,
121 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
122 (sizeof(unsigned int) * 32));
123 if (fprs & FPRS_DU)
124 err |= copy_from_user(fpregs+16,
125 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
126 (sizeof(unsigned int) * 32));
127 err |= __get_user(current_thread_info()->xfsr[0],
128 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
129 err |= __get_user(current_thread_info()->gsr[0],
130 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
131 regs->tstate &= ~TSTATE_PEF;
132 }
133 if (err)
134 goto do_sigsegv;
135
136 return;
137 do_sigsegv:
138 force_sig(SIGSEGV, current);
139 }
140
141 asmlinkage void sparc64_get_context(struct pt_regs *regs)
142 {
143 struct ucontext __user *ucp = (struct ucontext __user *)
144 regs->u_regs[UREG_I0];
145 mc_gregset_t __user *grp;
146 mcontext_t __user *mcp;
147 unsigned long fp, i7;
148 unsigned char fenab;
149 int err;
150
151 synchronize_user_stack();
152 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
153 goto do_sigsegv;
154
155 #if 1
156 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
157 #else
158 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
159 #endif
160
161 mcp = &ucp->uc_mcontext;
162 grp = &mcp->mc_gregs;
163
164 /* Skip over the trap instruction, first. */
165 if (test_thread_flag(TIF_32BIT)) {
166 regs->tpc = (regs->tnpc & 0xffffffff);
167 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
168 } else {
169 regs->tpc = regs->tnpc;
170 regs->tnpc += 4;
171 }
172 err = 0;
173 if (_NSIG_WORDS == 1)
174 err |= __put_user(current->blocked.sig[0],
175 (unsigned long __user *)&ucp->uc_sigmask);
176 else
177 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
178 sizeof(sigset_t));
179
180 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
181 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
182 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
183 err |= __put_user(regs->y, &((*grp)[MC_Y]));
184 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
185 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
186 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
187 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
188 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
189 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
190 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
191 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
192 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
193 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
194 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
195 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
196 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
197 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
198 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
199
200 err |= __get_user(fp,
201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
202 err |= __get_user(i7,
203 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
204 err |= __put_user(fp, &(mcp->mc_fp));
205 err |= __put_user(i7, &(mcp->mc_i7));
206
207 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
208 if (fenab) {
209 unsigned long *fpregs = current_thread_info()->fpregs;
210 unsigned long fprs;
211
212 fprs = current_thread_info()->fpsaved[0];
213 if (fprs & FPRS_DL)
214 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
215 (sizeof(unsigned int) * 32));
216 if (fprs & FPRS_DU)
217 err |= copy_to_user(
218 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
219 (sizeof(unsigned int) * 32));
220 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
221 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
222 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
223 }
224 if (err)
225 goto do_sigsegv;
226
227 return;
228 do_sigsegv:
229 force_sig(SIGSEGV, current);
230 }
231
232 struct rt_signal_frame {
233 struct sparc_stackf ss;
234 siginfo_t info;
235 struct pt_regs regs;
236 __siginfo_fpu_t __user *fpu_save;
237 stack_t stack;
238 sigset_t mask;
239 __siginfo_fpu_t fpu_state;
240 };
241
242 static long _sigpause_common(old_sigset_t set)
243 {
244 set &= _BLOCKABLE;
245 spin_lock_irq(&current->sighand->siglock);
246 current->saved_sigmask = current->blocked;
247 siginitset(&current->blocked, set);
248 recalc_sigpending();
249 spin_unlock_irq(&current->sighand->siglock);
250
251 current->state = TASK_INTERRUPTIBLE;
252 schedule();
253
254 set_restore_sigmask();
255
256 return -ERESTARTNOHAND;
257 }
258
259 asmlinkage long sys_sigpause(unsigned int set)
260 {
261 return _sigpause_common(set);
262 }
263
264 asmlinkage long sys_sigsuspend(old_sigset_t set)
265 {
266 return _sigpause_common(set);
267 }
268
269 static inline int
270 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
271 {
272 unsigned long *fpregs = current_thread_info()->fpregs;
273 unsigned long fprs;
274 int err;
275
276 err = __get_user(fprs, &fpu->si_fprs);
277 fprs_write(0);
278 regs->tstate &= ~TSTATE_PEF;
279 if (fprs & FPRS_DL)
280 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
281 (sizeof(unsigned int) * 32));
282 if (fprs & FPRS_DU)
283 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
284 (sizeof(unsigned int) * 32));
285 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
286 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
287 current_thread_info()->fpsaved[0] |= fprs;
288 return err;
289 }
290
291 void do_rt_sigreturn(struct pt_regs *regs)
292 {
293 struct rt_signal_frame __user *sf;
294 unsigned long tpc, tnpc, tstate;
295 __siginfo_fpu_t __user *fpu_save;
296 sigset_t set;
297 int err;
298
299 /* Always make any pending restarted system calls return -EINTR */
300 current_thread_info()->restart_block.fn = do_no_restart_syscall;
301
302 synchronize_user_stack ();
303 sf = (struct rt_signal_frame __user *)
304 (regs->u_regs [UREG_FP] + STACK_BIAS);
305
306 /* 1. Make sure we are not getting garbage from the user */
307 if (((unsigned long) sf) & 3)
308 goto segv;
309
310 err = get_user(tpc, &sf->regs.tpc);
311 err |= __get_user(tnpc, &sf->regs.tnpc);
312 if (test_thread_flag(TIF_32BIT)) {
313 tpc &= 0xffffffff;
314 tnpc &= 0xffffffff;
315 }
316 err |= ((tpc | tnpc) & 3);
317
318 /* 2. Restore the state */
319 err |= __get_user(regs->y, &sf->regs.y);
320 err |= __get_user(tstate, &sf->regs.tstate);
321 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
322
323 /* User can only change condition codes and %asi in %tstate. */
324 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
325 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
326
327 err |= __get_user(fpu_save, &sf->fpu_save);
328 if (fpu_save)
329 err |= restore_fpu_state(regs, &sf->fpu_state);
330
331 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
332 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
333
334 if (err)
335 goto segv;
336
337 regs->tpc = tpc;
338 regs->tnpc = tnpc;
339
340 /* Prevent syscall restart. */
341 pt_regs_clear_syscall(regs);
342
343 sigdelsetmask(&set, ~_BLOCKABLE);
344 spin_lock_irq(&current->sighand->siglock);
345 current->blocked = set;
346 recalc_sigpending();
347 spin_unlock_irq(&current->sighand->siglock);
348 return;
349 segv:
350 force_sig(SIGSEGV, current);
351 }
352
353 /* Checks if the fp is valid */
354 static int invalid_frame_pointer(void __user *fp, int fplen)
355 {
356 if (((unsigned long) fp) & 15)
357 return 1;
358 return 0;
359 }
360
361 static inline int
362 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
363 {
364 unsigned long *fpregs = current_thread_info()->fpregs;
365 unsigned long fprs;
366 int err = 0;
367
368 fprs = current_thread_info()->fpsaved[0];
369 if (fprs & FPRS_DL)
370 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
371 (sizeof(unsigned int) * 32));
372 if (fprs & FPRS_DU)
373 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
374 (sizeof(unsigned int) * 32));
375 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
376 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
377 err |= __put_user(fprs, &fpu->si_fprs);
378
379 return err;
380 }
381
382 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
383 {
384 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
385
386 /*
387 * If we are on the alternate signal stack and would overflow it, don't.
388 * Return an always-bogus address instead so we will die with SIGSEGV.
389 */
390 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
391 return (void __user *) -1L;
392
393 /* This is the X/Open sanctioned signal stack switching. */
394 if (ka->sa.sa_flags & SA_ONSTACK) {
395 if (sas_ss_flags(sp) == 0)
396 sp = current->sas_ss_sp + current->sas_ss_size;
397 }
398
399 sp -= framesize;
400
401 /* Always align the stack frame. This handles two cases. First,
402 * sigaltstack need not be mindful of platform specific stack
403 * alignment. Second, if we took this signal because the stack
404 * is not aligned properly, we'd like to take the signal cleanly
405 * and report that.
406 */
407 sp &= ~15UL;
408
409 return (void __user *) sp;
410 }
411
412 static inline void
413 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
414 int signo, sigset_t *oldset, siginfo_t *info)
415 {
416 struct rt_signal_frame __user *sf;
417 int sigframe_size, err;
418
419 /* 1. Make sure everything is clean */
420 synchronize_user_stack();
421 save_and_clear_fpu();
422
423 sigframe_size = sizeof(struct rt_signal_frame);
424 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
425 sigframe_size -= sizeof(__siginfo_fpu_t);
426
427 sf = (struct rt_signal_frame __user *)
428 get_sigframe(ka, regs, sigframe_size);
429
430 if (invalid_frame_pointer (sf, sigframe_size))
431 goto sigill;
432
433 if (get_thread_wsaved() != 0)
434 goto sigill;
435
436 /* 2. Save the current process state */
437 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
438
439 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
440 err |= save_fpu_state(regs, &sf->fpu_state);
441 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
442 } else {
443 err |= __put_user(0, &sf->fpu_save);
444 }
445
446 /* Setup sigaltstack */
447 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
448 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
449 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
450
451 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
452
453 err |= copy_in_user((u64 __user *)sf,
454 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
455 sizeof(struct reg_window));
456
457 if (info)
458 err |= copy_siginfo_to_user(&sf->info, info);
459 else {
460 err |= __put_user(signo, &sf->info.si_signo);
461 err |= __put_user(SI_NOINFO, &sf->info.si_code);
462 }
463 if (err)
464 goto sigsegv;
465
466 /* 3. signal handler back-trampoline and parameters */
467 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
468 regs->u_regs[UREG_I0] = signo;
469 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
470
471 /* The sigcontext is passed in this way because of how it
472 * is defined in GLIBC's /usr/include/bits/sigcontext.h
473 * for sparc64. It includes the 128 bytes of siginfo_t.
474 */
475 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
476
477 /* 5. signal handler */
478 regs->tpc = (unsigned long) ka->sa.sa_handler;
479 regs->tnpc = (regs->tpc + 4);
480 if (test_thread_flag(TIF_32BIT)) {
481 regs->tpc &= 0xffffffff;
482 regs->tnpc &= 0xffffffff;
483 }
484 /* 4. return to kernel instructions */
485 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
486 return;
487
488 sigill:
489 do_exit(SIGILL);
490 sigsegv:
491 force_sigsegv(signo, current);
492 }
493
494 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
495 siginfo_t *info,
496 sigset_t *oldset, struct pt_regs *regs)
497 {
498 setup_rt_frame(ka, regs, signr, oldset,
499 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
500 spin_lock_irq(&current->sighand->siglock);
501 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
502 if (!(ka->sa.sa_flags & SA_NOMASK))
503 sigaddset(&current->blocked,signr);
504 recalc_sigpending();
505 spin_unlock_irq(&current->sighand->siglock);
506 }
507
508 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
509 struct sigaction *sa)
510 {
511 switch (regs->u_regs[UREG_I0]) {
512 case ERESTART_RESTARTBLOCK:
513 case ERESTARTNOHAND:
514 no_system_call_restart:
515 regs->u_regs[UREG_I0] = EINTR;
516 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
517 break;
518 case ERESTARTSYS:
519 if (!(sa->sa_flags & SA_RESTART))
520 goto no_system_call_restart;
521 /* fallthrough */
522 case ERESTARTNOINTR:
523 regs->u_regs[UREG_I0] = orig_i0;
524 regs->tpc -= 4;
525 regs->tnpc -= 4;
526 }
527 }
528
529 /* Note that 'init' is a special process: it doesn't get signals it doesn't
530 * want to handle. Thus you cannot kill init even with a SIGKILL even by
531 * mistake.
532 */
533 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
534 {
535 struct k_sigaction ka;
536 int restart_syscall;
537 sigset_t *oldset;
538 siginfo_t info;
539 int signr;
540
541 if (pt_regs_is_syscall(regs) &&
542 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
543 restart_syscall = 1;
544 } else
545 restart_syscall = 0;
546
547 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
548 oldset = &current->saved_sigmask;
549 else
550 oldset = &current->blocked;
551
552 #ifdef CONFIG_COMPAT
553 if (test_thread_flag(TIF_32BIT)) {
554 extern void do_signal32(sigset_t *, struct pt_regs *,
555 int restart_syscall,
556 unsigned long orig_i0);
557 do_signal32(oldset, regs, restart_syscall, orig_i0);
558 return;
559 }
560 #endif
561
562 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
563
564 /* If the debugger messes with the program counter, it clears
565 * the software "in syscall" bit, directing us to not perform
566 * a syscall restart.
567 */
568 if (restart_syscall && !pt_regs_is_syscall(regs))
569 restart_syscall = 0;
570
571 if (signr > 0) {
572 if (restart_syscall)
573 syscall_restart(orig_i0, regs, &ka.sa);
574 handle_signal(signr, &ka, &info, oldset, regs);
575
576 /* A signal was successfully delivered; the saved
577 * sigmask will have been stored in the signal frame,
578 * and will be restored by sigreturn, so we can simply
579 * clear the TS_RESTORE_SIGMASK flag.
580 */
581 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
582
583 tracehook_signal_handler(signr, &info, &ka, regs, 0);
584 return;
585 }
586 if (restart_syscall &&
587 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
588 regs->u_regs[UREG_I0] == ERESTARTSYS ||
589 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
590 /* replay the system call when we are done */
591 regs->u_regs[UREG_I0] = orig_i0;
592 regs->tpc -= 4;
593 regs->tnpc -= 4;
594 }
595 if (restart_syscall &&
596 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
597 regs->u_regs[UREG_G1] = __NR_restart_syscall;
598 regs->tpc -= 4;
599 regs->tnpc -= 4;
600 }
601
602 /* If there's no signal to deliver, we just put the saved sigmask
603 * back
604 */
605 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
606 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
607 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
608 }
609 }
610
611 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
612 {
613 if (thread_info_flags & _TIF_SIGPENDING)
614 do_signal(regs, orig_i0);
615 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
616 clear_thread_flag(TIF_NOTIFY_RESUME);
617 tracehook_notify_resume(regs);
618 if (current->replacement_session_keyring)
619 key_replace_session_keyring();
620 }
621 }
622
Linux kernel - Deliverables
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