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conn rcv_lock converted to spinlock, struct cor_sock created, kernel_packet skb_clone...
[cor_2_6_31.git] / arch / sparc / kernel / signal_64.c
blobec82d76dc6f2cc245ca54203dd38c35fee192ed2
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) & 7)
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 /* Always align the stack frame. This handles two cases. First,
400 * sigaltstack need not be mindful of platform specific stack
401 * alignment. Second, if we took this signal because the stack
402 * is not aligned properly, we'd like to take the signal cleanly
403 * and report that.
404 */
405 sp &= ~7UL;
406
407 return (void __user *)(sp - framesize);
408 }
409
410 static inline void
411 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
412 int signo, sigset_t *oldset, siginfo_t *info)
413 {
414 struct rt_signal_frame __user *sf;
415 int sigframe_size, err;
416
417 /* 1. Make sure everything is clean */
418 synchronize_user_stack();
419 save_and_clear_fpu();
420
421 sigframe_size = sizeof(struct rt_signal_frame);
422 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
423 sigframe_size -= sizeof(__siginfo_fpu_t);
424
425 sf = (struct rt_signal_frame __user *)
426 get_sigframe(ka, regs, sigframe_size);
427
428 if (invalid_frame_pointer (sf, sigframe_size))
429 goto sigill;
430
431 if (get_thread_wsaved() != 0)
432 goto sigill;
433
434 /* 2. Save the current process state */
435 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
436
437 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
438 err |= save_fpu_state(regs, &sf->fpu_state);
439 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
440 } else {
441 err |= __put_user(0, &sf->fpu_save);
442 }
443
444 /* Setup sigaltstack */
445 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
446 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
447 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
448
449 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
450
451 err |= copy_in_user((u64 __user *)sf,
452 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
453 sizeof(struct reg_window));
454
455 if (info)
456 err |= copy_siginfo_to_user(&sf->info, info);
457 else {
458 err |= __put_user(signo, &sf->info.si_signo);
459 err |= __put_user(SI_NOINFO, &sf->info.si_code);
460 }
461 if (err)
462 goto sigsegv;
463
464 /* 3. signal handler back-trampoline and parameters */
465 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
466 regs->u_regs[UREG_I0] = signo;
467 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
468
469 /* The sigcontext is passed in this way because of how it
470 * is defined in GLIBC's /usr/include/bits/sigcontext.h
471 * for sparc64. It includes the 128 bytes of siginfo_t.
472 */
473 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
474
475 /* 5. signal handler */
476 regs->tpc = (unsigned long) ka->sa.sa_handler;
477 regs->tnpc = (regs->tpc + 4);
478 if (test_thread_flag(TIF_32BIT)) {
479 regs->tpc &= 0xffffffff;
480 regs->tnpc &= 0xffffffff;
481 }
482 /* 4. return to kernel instructions */
483 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
484 return;
485
486 sigill:
487 do_exit(SIGILL);
488 sigsegv:
489 force_sigsegv(signo, current);
490 }
491
492 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
493 siginfo_t *info,
494 sigset_t *oldset, struct pt_regs *regs)
495 {
496 setup_rt_frame(ka, regs, signr, oldset,
497 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
498 spin_lock_irq(&current->sighand->siglock);
499 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
500 if (!(ka->sa.sa_flags & SA_NOMASK))
501 sigaddset(&current->blocked,signr);
502 recalc_sigpending();
503 spin_unlock_irq(&current->sighand->siglock);
504 }
505
506 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
507 struct sigaction *sa)
508 {
509 switch (regs->u_regs[UREG_I0]) {
510 case ERESTART_RESTARTBLOCK:
511 case ERESTARTNOHAND:
512 no_system_call_restart:
513 regs->u_regs[UREG_I0] = EINTR;
514 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
515 break;
516 case ERESTARTSYS:
517 if (!(sa->sa_flags & SA_RESTART))
518 goto no_system_call_restart;
519 /* fallthrough */
520 case ERESTARTNOINTR:
521 regs->u_regs[UREG_I0] = orig_i0;
522 regs->tpc -= 4;
523 regs->tnpc -= 4;
524 }
525 }
526
527 /* Note that 'init' is a special process: it doesn't get signals it doesn't
528 * want to handle. Thus you cannot kill init even with a SIGKILL even by
529 * mistake.
530 */
531 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
532 {
533 struct k_sigaction ka;
534 int restart_syscall;
535 sigset_t *oldset;
536 siginfo_t info;
537 int signr;
538
539 if (pt_regs_is_syscall(regs) &&
540 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
541 restart_syscall = 1;
542 } else
543 restart_syscall = 0;
544
545 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
546 oldset = &current->saved_sigmask;
547 else
548 oldset = &current->blocked;
549
550 #ifdef CONFIG_COMPAT
551 if (test_thread_flag(TIF_32BIT)) {
552 extern void do_signal32(sigset_t *, struct pt_regs *,
553 int restart_syscall,
554 unsigned long orig_i0);
555 do_signal32(oldset, regs, restart_syscall, orig_i0);
556 return;
557 }
558 #endif
559
560 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
561
562 /* If the debugger messes with the program counter, it clears
563 * the software "in syscall" bit, directing us to not perform
564 * a syscall restart.
565 */
566 if (restart_syscall && !pt_regs_is_syscall(regs))
567 restart_syscall = 0;
568
569 if (signr > 0) {
570 if (restart_syscall)
571 syscall_restart(orig_i0, regs, &ka.sa);
572 handle_signal(signr, &ka, &info, oldset, regs);
573
574 /* A signal was successfully delivered; the saved
575 * sigmask will have been stored in the signal frame,
576 * and will be restored by sigreturn, so we can simply
577 * clear the TS_RESTORE_SIGMASK flag.
578 */
579 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
580
581 tracehook_signal_handler(signr, &info, &ka, regs, 0);
582 return;
583 }
584 if (restart_syscall &&
585 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
586 regs->u_regs[UREG_I0] == ERESTARTSYS ||
587 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
588 /* replay the system call when we are done */
589 regs->u_regs[UREG_I0] = orig_i0;
590 regs->tpc -= 4;
591 regs->tnpc -= 4;
592 }
593 if (restart_syscall &&
594 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
595 regs->u_regs[UREG_G1] = __NR_restart_syscall;
596 regs->tpc -= 4;
597 regs->tnpc -= 4;
598 }
599
600 /* If there's no signal to deliver, we just put the saved sigmask
601 * back
602 */
603 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
604 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
605 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
606 }
607 }
608
609 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
610 {
611 if (thread_info_flags & _TIF_SIGPENDING)
612 do_signal(regs, orig_i0);
613 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
614 clear_thread_flag(TIF_NOTIFY_RESUME);
615 tracehook_notify_resume(regs);
616 }
617 }
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