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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / arch / sparc / kernel / signal_64.c
blobf0836cd0e2f243ffb3c1df37ff02cc31488850b7
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 #include "sigutil.h"
38
39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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 sigdelsetmask(&set, ~_BLOCKABLE);
73 set_current_blocked(&set);
74 }
75 if (test_thread_flag(TIF_32BIT)) {
76 pc &= 0xffffffff;
77 npc &= 0xffffffff;
78 }
79 regs->tpc = pc;
80 regs->tnpc = npc;
81 err |= __get_user(regs->y, &((*grp)[MC_Y]));
82 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
83 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
84 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
85 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
86 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
87 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
88 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
89 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
90 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
91
92 /* Skip %g7 as that's the thread register in userspace. */
93
94 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
95 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
96 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
97 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
98 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
99 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
100 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
101 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
102
103 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
104 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
105 err |= __put_user(fp,
106 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
107 err |= __put_user(i7,
108 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
109
110 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
111 if (fenab) {
112 unsigned long *fpregs = current_thread_info()->fpregs;
113 unsigned long fprs;
114
115 fprs_write(0);
116 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
117 if (fprs & FPRS_DL)
118 err |= copy_from_user(fpregs,
119 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
120 (sizeof(unsigned int) * 32));
121 if (fprs & FPRS_DU)
122 err |= copy_from_user(fpregs+16,
123 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
124 (sizeof(unsigned int) * 32));
125 err |= __get_user(current_thread_info()->xfsr[0],
126 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
127 err |= __get_user(current_thread_info()->gsr[0],
128 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
129 regs->tstate &= ~TSTATE_PEF;
130 }
131 if (err)
132 goto do_sigsegv;
133
134 return;
135 do_sigsegv:
136 force_sig(SIGSEGV, current);
137 }
138
139 asmlinkage void sparc64_get_context(struct pt_regs *regs)
140 {
141 struct ucontext __user *ucp = (struct ucontext __user *)
142 regs->u_regs[UREG_I0];
143 mc_gregset_t __user *grp;
144 mcontext_t __user *mcp;
145 unsigned long fp, i7;
146 unsigned char fenab;
147 int err;
148
149 synchronize_user_stack();
150 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
151 goto do_sigsegv;
152
153 #if 1
154 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
155 #else
156 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
157 #endif
158
159 mcp = &ucp->uc_mcontext;
160 grp = &mcp->mc_gregs;
161
162 /* Skip over the trap instruction, first. */
163 if (test_thread_flag(TIF_32BIT)) {
164 regs->tpc = (regs->tnpc & 0xffffffff);
165 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
166 } else {
167 regs->tpc = regs->tnpc;
168 regs->tnpc += 4;
169 }
170 err = 0;
171 if (_NSIG_WORDS == 1)
172 err |= __put_user(current->blocked.sig[0],
173 (unsigned long __user *)&ucp->uc_sigmask);
174 else
175 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
176 sizeof(sigset_t));
177
178 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
179 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
180 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
181 err |= __put_user(regs->y, &((*grp)[MC_Y]));
182 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
183 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
184 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
185 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
186 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
187 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
188 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
189 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
190 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
191 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
192 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
193 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
194 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
195 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
196 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
197
198 err |= __get_user(fp,
199 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
200 err |= __get_user(i7,
201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
202 err |= __put_user(fp, &(mcp->mc_fp));
203 err |= __put_user(i7, &(mcp->mc_i7));
204
205 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
206 if (fenab) {
207 unsigned long *fpregs = current_thread_info()->fpregs;
208 unsigned long fprs;
209
210 fprs = current_thread_info()->fpsaved[0];
211 if (fprs & FPRS_DL)
212 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
213 (sizeof(unsigned int) * 32));
214 if (fprs & FPRS_DU)
215 err |= copy_to_user(
216 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
217 (sizeof(unsigned int) * 32));
218 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
219 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
220 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
221 }
222 if (err)
223 goto do_sigsegv;
224
225 return;
226 do_sigsegv:
227 force_sig(SIGSEGV, current);
228 }
229
230 struct rt_signal_frame {
231 struct sparc_stackf ss;
232 siginfo_t info;
233 struct pt_regs regs;
234 __siginfo_fpu_t __user *fpu_save;
235 stack_t stack;
236 sigset_t mask;
237 __siginfo_rwin_t *rwin_save;
238 };
239
240 static long _sigpause_common(old_sigset_t set)
241 {
242 sigset_t blocked;
243
244 current->saved_sigmask = current->blocked;
245
246 set &= _BLOCKABLE;
247 siginitset(&blocked, set);
248 set_current_blocked(&blocked);
249
250 current->state = TASK_INTERRUPTIBLE;
251 schedule();
252
253 set_restore_sigmask();
254
255 return -ERESTARTNOHAND;
256 }
257
258 asmlinkage long sys_sigpause(unsigned int set)
259 {
260 return _sigpause_common(set);
261 }
262
263 asmlinkage long sys_sigsuspend(old_sigset_t set)
264 {
265 return _sigpause_common(set);
266 }
267
268 void do_rt_sigreturn(struct pt_regs *regs)
269 {
270 struct rt_signal_frame __user *sf;
271 unsigned long tpc, tnpc, tstate;
272 __siginfo_fpu_t __user *fpu_save;
273 __siginfo_rwin_t __user *rwin_save;
274 sigset_t set;
275 int err;
276
277 /* Always make any pending restarted system calls return -EINTR */
278 current_thread_info()->restart_block.fn = do_no_restart_syscall;
279
280 synchronize_user_stack ();
281 sf = (struct rt_signal_frame __user *)
282 (regs->u_regs [UREG_FP] + STACK_BIAS);
283
284 /* 1. Make sure we are not getting garbage from the user */
285 if (((unsigned long) sf) & 3)
286 goto segv;
287
288 err = get_user(tpc, &sf->regs.tpc);
289 err |= __get_user(tnpc, &sf->regs.tnpc);
290 if (test_thread_flag(TIF_32BIT)) {
291 tpc &= 0xffffffff;
292 tnpc &= 0xffffffff;
293 }
294 err |= ((tpc | tnpc) & 3);
295
296 /* 2. Restore the state */
297 err |= __get_user(regs->y, &sf->regs.y);
298 err |= __get_user(tstate, &sf->regs.tstate);
299 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
300
301 /* User can only change condition codes and %asi in %tstate. */
302 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
303 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
304
305 err |= __get_user(fpu_save, &sf->fpu_save);
306 if (!err && fpu_save)
307 err |= restore_fpu_state(regs, fpu_save);
308
309 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
310 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
311
312 if (err)
313 goto segv;
314
315 err |= __get_user(rwin_save, &sf->rwin_save);
316 if (!err && rwin_save) {
317 if (restore_rwin_state(rwin_save))
318 goto segv;
319 }
320
321 regs->tpc = tpc;
322 regs->tnpc = tnpc;
323
324 /* Prevent syscall restart. */
325 pt_regs_clear_syscall(regs);
326
327 sigdelsetmask(&set, ~_BLOCKABLE);
328 set_current_blocked(&set);
329 return;
330 segv:
331 force_sig(SIGSEGV, current);
332 }
333
334 /* Checks if the fp is valid */
335 static int invalid_frame_pointer(void __user *fp)
336 {
337 if (((unsigned long) fp) & 15)
338 return 1;
339 return 0;
340 }
341
342 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
343 {
344 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
345
346 /*
347 * If we are on the alternate signal stack and would overflow it, don't.
348 * Return an always-bogus address instead so we will die with SIGSEGV.
349 */
350 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
351 return (void __user *) -1L;
352
353 /* This is the X/Open sanctioned signal stack switching. */
354 if (ka->sa.sa_flags & SA_ONSTACK) {
355 if (sas_ss_flags(sp) == 0)
356 sp = current->sas_ss_sp + current->sas_ss_size;
357 }
358
359 sp -= framesize;
360
361 /* Always align the stack frame. This handles two cases. First,
362 * sigaltstack need not be mindful of platform specific stack
363 * alignment. Second, if we took this signal because the stack
364 * is not aligned properly, we'd like to take the signal cleanly
365 * and report that.
366 */
367 sp &= ~15UL;
368
369 return (void __user *) sp;
370 }
371
372 static inline int
373 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
374 int signo, sigset_t *oldset, siginfo_t *info)
375 {
376 struct rt_signal_frame __user *sf;
377 int wsaved, err, sf_size;
378 void __user *tail;
379
380 /* 1. Make sure everything is clean */
381 synchronize_user_stack();
382 save_and_clear_fpu();
383
384 wsaved = get_thread_wsaved();
385
386 sf_size = sizeof(struct rt_signal_frame);
387 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
388 sf_size += sizeof(__siginfo_fpu_t);
389 if (wsaved)
390 sf_size += sizeof(__siginfo_rwin_t);
391 sf = (struct rt_signal_frame __user *)
392 get_sigframe(ka, regs, sf_size);
393
394 if (invalid_frame_pointer (sf))
395 goto sigill;
396
397 tail = (sf + 1);
398
399 /* 2. Save the current process state */
400 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
401
402 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
403 __siginfo_fpu_t __user *fpu_save = tail;
404 tail += sizeof(__siginfo_fpu_t);
405 err |= save_fpu_state(regs, fpu_save);
406 err |= __put_user((u64)fpu_save, &sf->fpu_save);
407 } else {
408 err |= __put_user(0, &sf->fpu_save);
409 }
410 if (wsaved) {
411 __siginfo_rwin_t __user *rwin_save = tail;
412 tail += sizeof(__siginfo_rwin_t);
413 err |= save_rwin_state(wsaved, rwin_save);
414 err |= __put_user((u64)rwin_save, &sf->rwin_save);
415 set_thread_wsaved(0);
416 } else {
417 err |= __put_user(0, &sf->rwin_save);
418 }
419
420 /* Setup sigaltstack */
421 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
422 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
423 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
424
425 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
426
427 if (!wsaved) {
428 err |= copy_in_user((u64 __user *)sf,
429 (u64 __user *)(regs->u_regs[UREG_FP] +
430 STACK_BIAS),
431 sizeof(struct reg_window));
432 } else {
433 struct reg_window *rp;
434
435 rp = &current_thread_info()->reg_window[wsaved - 1];
436 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
437 }
438 if (info)
439 err |= copy_siginfo_to_user(&sf->info, info);
440 else {
441 err |= __put_user(signo, &sf->info.si_signo);
442 err |= __put_user(SI_NOINFO, &sf->info.si_code);
443 }
444 if (err)
445 goto sigsegv;
446
447 /* 3. signal handler back-trampoline and parameters */
448 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
449 regs->u_regs[UREG_I0] = signo;
450 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
451
452 /* The sigcontext is passed in this way because of how it
453 * is defined in GLIBC's /usr/include/bits/sigcontext.h
454 * for sparc64. It includes the 128 bytes of siginfo_t.
455 */
456 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
457
458 /* 5. signal handler */
459 regs->tpc = (unsigned long) ka->sa.sa_handler;
460 regs->tnpc = (regs->tpc + 4);
461 if (test_thread_flag(TIF_32BIT)) {
462 regs->tpc &= 0xffffffff;
463 regs->tnpc &= 0xffffffff;
464 }
465 /* 4. return to kernel instructions */
466 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
467 return 0;
468
469 sigill:
470 do_exit(SIGILL);
471 return -EINVAL;
472
473 sigsegv:
474 force_sigsegv(signo, current);
475 return -EFAULT;
476 }
477
478 static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
479 siginfo_t *info,
480 sigset_t *oldset, struct pt_regs *regs)
481 {
482 sigset_t blocked;
483 int err;
484
485 err = setup_rt_frame(ka, regs, signr, oldset,
486 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
487 if (err)
488 return err;
489 sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
490 if (!(ka->sa.sa_flags & SA_NOMASK))
491 sigaddset(&blocked, signr);
492 set_current_blocked(&blocked);
493
494 tracehook_signal_handler(signr, info, ka, regs, 0);
495
496 return 0;
497 }
498
499 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
500 struct sigaction *sa)
501 {
502 switch (regs->u_regs[UREG_I0]) {
503 case ERESTART_RESTARTBLOCK:
504 case ERESTARTNOHAND:
505 no_system_call_restart:
506 regs->u_regs[UREG_I0] = EINTR;
507 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
508 break;
509 case ERESTARTSYS:
510 if (!(sa->sa_flags & SA_RESTART))
511 goto no_system_call_restart;
512 /* fallthrough */
513 case ERESTARTNOINTR:
514 regs->u_regs[UREG_I0] = orig_i0;
515 regs->tpc -= 4;
516 regs->tnpc -= 4;
517 }
518 }
519
520 /* Note that 'init' is a special process: it doesn't get signals it doesn't
521 * want to handle. Thus you cannot kill init even with a SIGKILL even by
522 * mistake.
523 */
524 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
525 {
526 struct k_sigaction ka;
527 int restart_syscall;
528 sigset_t *oldset;
529 siginfo_t info;
530 int signr;
531
532 /* It's a lot of work and synchronization to add a new ptrace
533 * register for GDB to save and restore in order to get
534 * orig_i0 correct for syscall restarts when debugging.
535 *
536 * Although it should be the case that most of the global
537 * registers are volatile across a system call, glibc already
538 * depends upon that fact that we preserve them. So we can't
539 * just use any global register to save away the orig_i0 value.
540 *
541 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
542 * preserved across a system call trap by various pieces of
543 * code in glibc.
544 *
545 * %g7 is used as the "thread register". %g6 is not used in
546 * any fixed manner. %g6 is used as a scratch register and
547 * a compiler temporary, but it's value is never used across
548 * a system call. Therefore %g6 is usable for orig_i0 storage.
549 */
550 if (pt_regs_is_syscall(regs) &&
551 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
552 regs->u_regs[UREG_G6] = orig_i0;
553
554 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
555 oldset = &current->saved_sigmask;
556 else
557 oldset = &current->blocked;
558
559 #ifdef CONFIG_COMPAT
560 if (test_thread_flag(TIF_32BIT)) {
561 extern void do_signal32(sigset_t *, struct pt_regs *);
562 do_signal32(oldset, regs);
563 return;
564 }
565 #endif
566
567 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
568
569 restart_syscall = 0;
570 if (pt_regs_is_syscall(regs) &&
571 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
572 restart_syscall = 1;
573 orig_i0 = regs->u_regs[UREG_G6];
574 }
575
576 if (signr > 0) {
577 if (restart_syscall)
578 syscall_restart(orig_i0, regs, &ka.sa);
579 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
580 /* A signal was successfully delivered; the saved
581 * sigmask will have been stored in the signal frame,
582 * and will be restored by sigreturn, so we can simply
583 * clear the TS_RESTORE_SIGMASK flag.
584 */
585 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
586 }
587 return;
588 }
589 if (restart_syscall &&
590 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
591 regs->u_regs[UREG_I0] == ERESTARTSYS ||
592 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
593 /* replay the system call when we are done */
594 regs->u_regs[UREG_I0] = orig_i0;
595 regs->tpc -= 4;
596 regs->tnpc -= 4;
597 pt_regs_clear_syscall(regs);
598 }
599 if (restart_syscall &&
600 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
601 regs->u_regs[UREG_G1] = __NR_restart_syscall;
602 regs->tpc -= 4;
603 regs->tnpc -= 4;
604 pt_regs_clear_syscall(regs);
605 }
606
607 /* If there's no signal to deliver, we just put the saved sigmask
608 * back
609 */
610 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
611 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
612 set_current_blocked(&current->saved_sigmask);
613 }
614 }
615
616 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
617 {
618 if (thread_info_flags & _TIF_SIGPENDING)
619 do_signal(regs, orig_i0);
620 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
621 clear_thread_flag(TIF_NOTIFY_RESUME);
622 tracehook_notify_resume(regs);
623 if (current->replacement_session_keyring)
624 key_replace_session_keyring();
625 }
626 }
627