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sparc64: remove CVS keywords
[deliverable/linux.git] / arch / sparc64 / kernel / signal.c
1 /*
2 * arch/sparc64/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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/unistd.h>
21 #include <linux/mm.h>
22 #include <linux/tty.h>
23 #include <linux/binfmts.h>
24 #include <linux/bitops.h>
25
26 #include <asm/uaccess.h>
27 #include <asm/ptrace.h>
28 #include <asm/pgtable.h>
29 #include <asm/fpumacro.h>
30 #include <asm/uctx.h>
31 #include <asm/siginfo.h>
32 #include <asm/visasm.h>
33
34 #include "entry.h"
35 #include "systbls.h"
36
37 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38
39 /* {set, get}context() needed for 64-bit SparcLinux userland. */
40 asmlinkage void sparc64_set_context(struct pt_regs *regs)
41 {
42 struct ucontext __user *ucp = (struct ucontext __user *)
43 regs->u_regs[UREG_I0];
44 mc_gregset_t __user *grp;
45 unsigned long pc, npc, tstate;
46 unsigned long fp, i7;
47 unsigned char fenab;
48 int err;
49
50 flush_user_windows();
51 if (get_thread_wsaved() ||
52 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
53 (!__access_ok(ucp, sizeof(*ucp))))
54 goto do_sigsegv;
55 grp = &ucp->uc_mcontext.mc_gregs;
56 err = __get_user(pc, &((*grp)[MC_PC]));
57 err |= __get_user(npc, &((*grp)[MC_NPC]));
58 if (err || ((pc | npc) & 3))
59 goto do_sigsegv;
60 if (regs->u_regs[UREG_I1]) {
61 sigset_t set;
62
63 if (_NSIG_WORDS == 1) {
64 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
65 goto do_sigsegv;
66 } else {
67 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
68 goto do_sigsegv;
69 }
70 sigdelsetmask(&set, ~_BLOCKABLE);
71 spin_lock_irq(&current->sighand->siglock);
72 current->blocked = set;
73 recalc_sigpending();
74 spin_unlock_irq(&current->sighand->siglock);
75 }
76 if (test_thread_flag(TIF_32BIT)) {
77 pc &= 0xffffffff;
78 npc &= 0xffffffff;
79 }
80 regs->tpc = pc;
81 regs->tnpc = npc;
82 err |= __get_user(regs->y, &((*grp)[MC_Y]));
83 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
84 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
85 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
86 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
87 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
88 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
89 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
90 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
91 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
92 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
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_fpu_t fpu_state;
237 };
238
239 static long _sigpause_common(old_sigset_t set)
240 {
241 set &= _BLOCKABLE;
242 spin_lock_irq(&current->sighand->siglock);
243 current->saved_sigmask = current->blocked;
244 siginitset(&current->blocked, set);
245 recalc_sigpending();
246 spin_unlock_irq(&current->sighand->siglock);
247
248 current->state = TASK_INTERRUPTIBLE;
249 schedule();
250
251 set_restore_sigmask();
252
253 return -ERESTARTNOHAND;
254 }
255
256 asmlinkage long sys_sigpause(unsigned int set)
257 {
258 return _sigpause_common(set);
259 }
260
261 asmlinkage long sys_sigsuspend(old_sigset_t set)
262 {
263 return _sigpause_common(set);
264 }
265
266 static inline int
267 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
268 {
269 unsigned long *fpregs = current_thread_info()->fpregs;
270 unsigned long fprs;
271 int err;
272
273 err = __get_user(fprs, &fpu->si_fprs);
274 fprs_write(0);
275 regs->tstate &= ~TSTATE_PEF;
276 if (fprs & FPRS_DL)
277 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
278 (sizeof(unsigned int) * 32));
279 if (fprs & FPRS_DU)
280 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
281 (sizeof(unsigned int) * 32));
282 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
283 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
284 current_thread_info()->fpsaved[0] |= fprs;
285 return err;
286 }
287
288 void do_rt_sigreturn(struct pt_regs *regs)
289 {
290 struct rt_signal_frame __user *sf;
291 unsigned long tpc, tnpc, tstate;
292 __siginfo_fpu_t __user *fpu_save;
293 sigset_t set;
294 int err;
295
296 /* Always make any pending restarted system calls return -EINTR */
297 current_thread_info()->restart_block.fn = do_no_restart_syscall;
298
299 synchronize_user_stack ();
300 sf = (struct rt_signal_frame __user *)
301 (regs->u_regs [UREG_FP] + STACK_BIAS);
302
303 /* 1. Make sure we are not getting garbage from the user */
304 if (((unsigned long) sf) & 3)
305 goto segv;
306
307 err = get_user(tpc, &sf->regs.tpc);
308 err |= __get_user(tnpc, &sf->regs.tnpc);
309 if (test_thread_flag(TIF_32BIT)) {
310 tpc &= 0xffffffff;
311 tnpc &= 0xffffffff;
312 }
313 err |= ((tpc | tnpc) & 3);
314
315 /* 2. Restore the state */
316 err |= __get_user(regs->y, &sf->regs.y);
317 err |= __get_user(tstate, &sf->regs.tstate);
318 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
319
320 /* User can only change condition codes and %asi in %tstate. */
321 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
322 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
323
324 err |= __get_user(fpu_save, &sf->fpu_save);
325 if (fpu_save)
326 err |= restore_fpu_state(regs, &sf->fpu_state);
327
328 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
329 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
330
331 if (err)
332 goto segv;
333
334 regs->tpc = tpc;
335 regs->tnpc = tnpc;
336
337 /* Prevent syscall restart. */
338 pt_regs_clear_syscall(regs);
339
340 sigdelsetmask(&set, ~_BLOCKABLE);
341 spin_lock_irq(&current->sighand->siglock);
342 current->blocked = set;
343 recalc_sigpending();
344 spin_unlock_irq(&current->sighand->siglock);
345 return;
346 segv:
347 force_sig(SIGSEGV, current);
348 }
349
350 /* Checks if the fp is valid */
351 static int invalid_frame_pointer(void __user *fp, int fplen)
352 {
353 if (((unsigned long) fp) & 7)
354 return 1;
355 return 0;
356 }
357
358 static inline int
359 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
360 {
361 unsigned long *fpregs = current_thread_info()->fpregs;
362 unsigned long fprs;
363 int err = 0;
364
365 fprs = current_thread_info()->fpsaved[0];
366 if (fprs & FPRS_DL)
367 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
368 (sizeof(unsigned int) * 32));
369 if (fprs & FPRS_DU)
370 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
371 (sizeof(unsigned int) * 32));
372 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
373 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
374 err |= __put_user(fprs, &fpu->si_fprs);
375
376 return err;
377 }
378
379 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
380 {
381 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
382
383 /*
384 * If we are on the alternate signal stack and would overflow it, don't.
385 * Return an always-bogus address instead so we will die with SIGSEGV.
386 */
387 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
388 return (void __user *) -1L;
389
390 /* This is the X/Open sanctioned signal stack switching. */
391 if (ka->sa.sa_flags & SA_ONSTACK) {
392 if (sas_ss_flags(sp) == 0)
393 sp = current->sas_ss_sp + current->sas_ss_size;
394 }
395
396 /* Always align the stack frame. This handles two cases. First,
397 * sigaltstack need not be mindful of platform specific stack
398 * alignment. Second, if we took this signal because the stack
399 * is not aligned properly, we'd like to take the signal cleanly
400 * and report that.
401 */
402 sp &= ~7UL;
403
404 return (void __user *)(sp - framesize);
405 }
406
407 static inline void
408 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
409 int signo, sigset_t *oldset, siginfo_t *info)
410 {
411 struct rt_signal_frame __user *sf;
412 int sigframe_size, err;
413
414 /* 1. Make sure everything is clean */
415 synchronize_user_stack();
416 save_and_clear_fpu();
417
418 sigframe_size = sizeof(struct rt_signal_frame);
419 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
420 sigframe_size -= sizeof(__siginfo_fpu_t);
421
422 sf = (struct rt_signal_frame __user *)
423 get_sigframe(ka, regs, sigframe_size);
424
425 if (invalid_frame_pointer (sf, sigframe_size))
426 goto sigill;
427
428 if (get_thread_wsaved() != 0)
429 goto sigill;
430
431 /* 2. Save the current process state */
432 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
433
434 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
435 err |= save_fpu_state(regs, &sf->fpu_state);
436 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
437 } else {
438 err |= __put_user(0, &sf->fpu_save);
439 }
440
441 /* Setup sigaltstack */
442 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
443 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
444 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
445
446 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
447
448 err |= copy_in_user((u64 __user *)sf,
449 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
450 sizeof(struct reg_window));
451
452 if (info)
453 err |= copy_siginfo_to_user(&sf->info, info);
454 else {
455 err |= __put_user(signo, &sf->info.si_signo);
456 err |= __put_user(SI_NOINFO, &sf->info.si_code);
457 }
458 if (err)
459 goto sigsegv;
460
461 /* 3. signal handler back-trampoline and parameters */
462 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
463 regs->u_regs[UREG_I0] = signo;
464 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
465
466 /* The sigcontext is passed in this way because of how it
467 * is defined in GLIBC's /usr/include/bits/sigcontext.h
468 * for sparc64. It includes the 128 bytes of siginfo_t.
469 */
470 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
471
472 /* 5. signal handler */
473 regs->tpc = (unsigned long) ka->sa.sa_handler;
474 regs->tnpc = (regs->tpc + 4);
475 if (test_thread_flag(TIF_32BIT)) {
476 regs->tpc &= 0xffffffff;
477 regs->tnpc &= 0xffffffff;
478 }
479 /* 4. return to kernel instructions */
480 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
481 return;
482
483 sigill:
484 do_exit(SIGILL);
485 sigsegv:
486 force_sigsegv(signo, current);
487 }
488
489 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
490 siginfo_t *info,
491 sigset_t *oldset, struct pt_regs *regs)
492 {
493 setup_rt_frame(ka, regs, signr, oldset,
494 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
495 spin_lock_irq(&current->sighand->siglock);
496 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
497 if (!(ka->sa.sa_flags & SA_NOMASK))
498 sigaddset(&current->blocked,signr);
499 recalc_sigpending();
500 spin_unlock_irq(&current->sighand->siglock);
501 }
502
503 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
504 struct sigaction *sa)
505 {
506 switch (regs->u_regs[UREG_I0]) {
507 case ERESTART_RESTARTBLOCK:
508 case ERESTARTNOHAND:
509 no_system_call_restart:
510 regs->u_regs[UREG_I0] = EINTR;
511 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
512 break;
513 case ERESTARTSYS:
514 if (!(sa->sa_flags & SA_RESTART))
515 goto no_system_call_restart;
516 /* fallthrough */
517 case ERESTARTNOINTR:
518 regs->u_regs[UREG_I0] = orig_i0;
519 regs->tpc -= 4;
520 regs->tnpc -= 4;
521 }
522 }
523
524 /* Note that 'init' is a special process: it doesn't get signals it doesn't
525 * want to handle. Thus you cannot kill init even with a SIGKILL even by
526 * mistake.
527 */
528 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
529 {
530 struct k_sigaction ka;
531 int restart_syscall;
532 sigset_t *oldset;
533 siginfo_t info;
534 int signr;
535
536 if (pt_regs_is_syscall(regs) &&
537 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
538 restart_syscall = 1;
539 } else
540 restart_syscall = 0;
541
542 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
543 oldset = &current->saved_sigmask;
544 else
545 oldset = &current->blocked;
546
547 #ifdef CONFIG_COMPAT
548 if (test_thread_flag(TIF_32BIT)) {
549 extern void do_signal32(sigset_t *, struct pt_regs *,
550 int restart_syscall,
551 unsigned long orig_i0);
552 do_signal32(oldset, regs, restart_syscall, orig_i0);
553 return;
554 }
555 #endif
556
557 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
558
559 /* If the debugger messes with the program counter, it clears
560 * the software "in syscall" bit, directing us to not perform
561 * a syscall restart.
562 */
563 if (restart_syscall && !pt_regs_is_syscall(regs))
564 restart_syscall = 0;
565
566 if (signr > 0) {
567 if (restart_syscall)
568 syscall_restart(orig_i0, regs, &ka.sa);
569 handle_signal(signr, &ka, &info, oldset, regs);
570
571 /* A signal was successfully delivered; the saved
572 * sigmask will have been stored in the signal frame,
573 * and will be restored by sigreturn, so we can simply
574 * clear the TS_RESTORE_SIGMASK flag.
575 */
576 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
577 return;
578 }
579 if (restart_syscall &&
580 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
581 regs->u_regs[UREG_I0] == ERESTARTSYS ||
582 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
583 /* replay the system call when we are done */
584 regs->u_regs[UREG_I0] = orig_i0;
585 regs->tpc -= 4;
586 regs->tnpc -= 4;
587 }
588 if (restart_syscall &&
589 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
590 regs->u_regs[UREG_G1] = __NR_restart_syscall;
591 regs->tpc -= 4;
592 regs->tnpc -= 4;
593 }
594
595 /* If there's no signal to deliver, we just put the saved sigmask
596 * back
597 */
598 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
599 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
600 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
601 }
602 }
603
604 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
605 {
606 if (thread_info_flags & _TIF_SIGPENDING)
607 do_signal(regs, orig_i0);
608 }
Linux kernel - Deliverables
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