ia64/linux-2.6.18-xen.hg

view arch/sparc64/kernel/signal.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
parents
children
line source
1 /* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
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 */
11 #ifdef CONFIG_SPARC32_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/smp_lock.h>
24 #include <linux/binfmts.h>
25 #include <linux/bitops.h>
27 #include <asm/uaccess.h>
28 #include <asm/ptrace.h>
29 #include <asm/svr4.h>
30 #include <asm/pgtable.h>
31 #include <asm/fpumacro.h>
32 #include <asm/uctx.h>
33 #include <asm/siginfo.h>
34 #include <asm/visasm.h>
36 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38 /* {set, get}context() needed for 64-bit SparcLinux userland. */
39 asmlinkage void sparc64_set_context(struct pt_regs *regs)
40 {
41 struct ucontext __user *ucp = (struct ucontext __user *)
42 regs->u_regs[UREG_I0];
43 mc_gregset_t __user *grp;
44 unsigned long pc, npc, tstate;
45 unsigned long fp, i7;
46 unsigned char fenab;
47 int err;
49 flush_user_windows();
50 if (get_thread_wsaved() ||
51 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
52 (!__access_ok(ucp, sizeof(*ucp))))
53 goto do_sigsegv;
54 grp = &ucp->uc_mcontext.mc_gregs;
55 err = __get_user(pc, &((*grp)[MC_PC]));
56 err |= __get_user(npc, &((*grp)[MC_NPC]));
57 if (err || ((pc | npc) & 3))
58 goto do_sigsegv;
59 if (regs->u_regs[UREG_I1]) {
60 sigset_t set;
62 if (_NSIG_WORDS == 1) {
63 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
64 goto do_sigsegv;
65 } else {
66 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
67 goto do_sigsegv;
68 }
69 sigdelsetmask(&set, ~_BLOCKABLE);
70 spin_lock_irq(&current->sighand->siglock);
71 current->blocked = set;
72 recalc_sigpending();
73 spin_unlock_irq(&current->sighand->siglock);
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 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
92 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
93 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
94 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
95 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
96 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
97 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
98 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
99 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
101 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
102 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
103 err |= __put_user(fp,
104 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
105 err |= __put_user(i7,
106 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
108 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
109 if (fenab) {
110 unsigned long *fpregs = current_thread_info()->fpregs;
111 unsigned long fprs;
113 fprs_write(0);
114 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
115 if (fprs & FPRS_DL)
116 err |= copy_from_user(fpregs,
117 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
118 (sizeof(unsigned int) * 32));
119 if (fprs & FPRS_DU)
120 err |= copy_from_user(fpregs+16,
121 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
122 (sizeof(unsigned int) * 32));
123 err |= __get_user(current_thread_info()->xfsr[0],
124 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
125 err |= __get_user(current_thread_info()->gsr[0],
126 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
127 regs->tstate &= ~TSTATE_PEF;
128 }
129 if (err)
130 goto do_sigsegv;
132 return;
133 do_sigsegv:
134 force_sig(SIGSEGV, current);
135 }
137 asmlinkage void sparc64_get_context(struct pt_regs *regs)
138 {
139 struct ucontext __user *ucp = (struct ucontext __user *)
140 regs->u_regs[UREG_I0];
141 mc_gregset_t __user *grp;
142 mcontext_t __user *mcp;
143 unsigned long fp, i7;
144 unsigned char fenab;
145 int err;
147 synchronize_user_stack();
148 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
149 goto do_sigsegv;
151 #if 1
152 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
153 #else
154 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
155 #endif
157 mcp = &ucp->uc_mcontext;
158 grp = &mcp->mc_gregs;
160 /* Skip over the trap instruction, first. */
161 if (test_thread_flag(TIF_32BIT)) {
162 regs->tpc = (regs->tnpc & 0xffffffff);
163 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
164 } else {
165 regs->tpc = regs->tnpc;
166 regs->tnpc += 4;
167 }
168 err = 0;
169 if (_NSIG_WORDS == 1)
170 err |= __put_user(current->blocked.sig[0],
171 (unsigned long __user *)&ucp->uc_sigmask);
172 else
173 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
174 sizeof(sigset_t));
176 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
177 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
178 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
179 err |= __put_user(regs->y, &((*grp)[MC_Y]));
180 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
181 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
182 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
183 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
184 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
185 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
186 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
187 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
188 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
189 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
190 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
191 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
192 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
193 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
194 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
196 err |= __get_user(fp,
197 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
198 err |= __get_user(i7,
199 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
200 err |= __put_user(fp, &(mcp->mc_fp));
201 err |= __put_user(i7, &(mcp->mc_i7));
203 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
204 if (fenab) {
205 unsigned long *fpregs = current_thread_info()->fpregs;
206 unsigned long fprs;
208 fprs = current_thread_info()->fpsaved[0];
209 if (fprs & FPRS_DL)
210 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
211 (sizeof(unsigned int) * 32));
212 if (fprs & FPRS_DU)
213 err |= copy_to_user(
214 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
215 (sizeof(unsigned int) * 32));
216 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
217 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
218 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
219 }
220 if (err)
221 goto do_sigsegv;
223 return;
224 do_sigsegv:
225 force_sig(SIGSEGV, current);
226 }
228 struct rt_signal_frame {
229 struct sparc_stackf ss;
230 siginfo_t info;
231 struct pt_regs regs;
232 __siginfo_fpu_t __user *fpu_save;
233 stack_t stack;
234 sigset_t mask;
235 __siginfo_fpu_t fpu_state;
236 };
238 /* Align macros */
239 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
241 static long _sigpause_common(old_sigset_t set)
242 {
243 set &= _BLOCKABLE;
244 spin_lock_irq(&current->sighand->siglock);
245 current->saved_sigmask = current->blocked;
246 siginitset(&current->blocked, set);
247 recalc_sigpending();
248 spin_unlock_irq(&current->sighand->siglock);
250 current->state = TASK_INTERRUPTIBLE;
251 schedule();
252 set_thread_flag(TIF_RESTORE_SIGMASK);
253 return -ERESTARTNOHAND;
254 }
256 asmlinkage long sys_sigpause(unsigned int set)
257 {
258 return _sigpause_common(set);
259 }
261 asmlinkage long sys_sigsuspend(old_sigset_t set)
262 {
263 return _sigpause_common(set);
264 }
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;
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 }
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 mm_segment_t old_fs;
294 sigset_t set;
295 stack_t st;
296 int err;
298 /* Always make any pending restarted system calls return -EINTR */
299 current_thread_info()->restart_block.fn = do_no_restart_syscall;
301 synchronize_user_stack ();
302 sf = (struct rt_signal_frame __user *)
303 (regs->u_regs [UREG_FP] + STACK_BIAS);
305 /* 1. Make sure we are not getting garbage from the user */
306 if (((unsigned long) sf) & 3)
307 goto segv;
309 err = get_user(tpc, &sf->regs.tpc);
310 err |= __get_user(tnpc, &sf->regs.tnpc);
311 if (test_thread_flag(TIF_32BIT)) {
312 tpc &= 0xffffffff;
313 tnpc &= 0xffffffff;
314 }
315 err |= ((tpc | tnpc) & 3);
317 /* 2. Restore the state */
318 err |= __get_user(regs->y, &sf->regs.y);
319 err |= __get_user(tstate, &sf->regs.tstate);
320 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
322 /* User can only change condition codes and %asi in %tstate. */
323 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
324 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
326 err |= __get_user(fpu_save, &sf->fpu_save);
327 if (fpu_save)
328 err |= restore_fpu_state(regs, &sf->fpu_state);
330 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
331 err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
333 if (err)
334 goto segv;
336 regs->tpc = tpc;
337 regs->tnpc = tnpc;
339 /* It is more difficult to avoid calling this function than to
340 call it and ignore errors. */
341 old_fs = get_fs();
342 set_fs(KERNEL_DS);
343 do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
344 set_fs(old_fs);
346 sigdelsetmask(&set, ~_BLOCKABLE);
347 spin_lock_irq(&current->sighand->siglock);
348 current->blocked = set;
349 recalc_sigpending();
350 spin_unlock_irq(&current->sighand->siglock);
351 return;
352 segv:
353 force_sig(SIGSEGV, current);
354 }
356 /* Checks if the fp is valid */
357 static int invalid_frame_pointer(void __user *fp, int fplen)
358 {
359 if (((unsigned long) fp) & 7)
360 return 1;
361 return 0;
362 }
364 static inline int
365 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
366 {
367 unsigned long *fpregs = (unsigned long *)(regs+1);
368 unsigned long fprs;
369 int err = 0;
371 fprs = current_thread_info()->fpsaved[0];
372 if (fprs & FPRS_DL)
373 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
374 (sizeof(unsigned int) * 32));
375 if (fprs & FPRS_DU)
376 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
377 (sizeof(unsigned int) * 32));
378 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
379 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
380 err |= __put_user(fprs, &fpu->si_fprs);
382 return err;
383 }
385 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
386 {
387 unsigned long sp;
389 sp = regs->u_regs[UREG_FP] + STACK_BIAS;
391 /* This is the X/Open sanctioned signal stack switching. */
392 if (ka->sa.sa_flags & SA_ONSTACK) {
393 if (!on_sig_stack(sp) &&
394 !((current->sas_ss_sp + current->sas_ss_size) & 7))
395 sp = current->sas_ss_sp + current->sas_ss_size;
396 }
397 return (void __user *)(sp - framesize);
398 }
400 static inline void
401 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
402 int signo, sigset_t *oldset, siginfo_t *info)
403 {
404 struct rt_signal_frame __user *sf;
405 int sigframe_size, err;
407 /* 1. Make sure everything is clean */
408 synchronize_user_stack();
409 save_and_clear_fpu();
411 sigframe_size = RT_ALIGNEDSZ;
412 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
413 sigframe_size -= sizeof(__siginfo_fpu_t);
415 sf = (struct rt_signal_frame __user *)
416 get_sigframe(ka, regs, sigframe_size);
418 if (invalid_frame_pointer (sf, sigframe_size))
419 goto sigill;
421 if (get_thread_wsaved() != 0)
422 goto sigill;
424 /* 2. Save the current process state */
425 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
427 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
428 err |= save_fpu_state(regs, &sf->fpu_state);
429 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
430 } else {
431 err |= __put_user(0, &sf->fpu_save);
432 }
434 /* Setup sigaltstack */
435 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
436 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
437 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
439 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
441 err |= copy_in_user((u64 __user *)sf,
442 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
443 sizeof(struct reg_window));
445 if (info)
446 err |= copy_siginfo_to_user(&sf->info, info);
447 else {
448 err |= __put_user(signo, &sf->info.si_signo);
449 err |= __put_user(SI_NOINFO, &sf->info.si_code);
450 }
451 if (err)
452 goto sigsegv;
454 /* 3. signal handler back-trampoline and parameters */
455 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
456 regs->u_regs[UREG_I0] = signo;
457 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
459 /* The sigcontext is passed in this way because of how it
460 * is defined in GLIBC's /usr/include/bits/sigcontext.h
461 * for sparc64. It includes the 128 bytes of siginfo_t.
462 */
463 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
465 /* 5. signal handler */
466 regs->tpc = (unsigned long) ka->sa.sa_handler;
467 regs->tnpc = (regs->tpc + 4);
468 if (test_thread_flag(TIF_32BIT)) {
469 regs->tpc &= 0xffffffff;
470 regs->tnpc &= 0xffffffff;
471 }
472 /* 4. return to kernel instructions */
473 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
474 return;
476 sigill:
477 do_exit(SIGILL);
478 sigsegv:
479 force_sigsegv(signo, current);
480 }
482 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
483 siginfo_t *info,
484 sigset_t *oldset, struct pt_regs *regs)
485 {
486 setup_rt_frame(ka, regs, signr, oldset,
487 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
488 spin_lock_irq(&current->sighand->siglock);
489 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
490 if (!(ka->sa.sa_flags & SA_NOMASK))
491 sigaddset(&current->blocked,signr);
492 recalc_sigpending();
493 spin_unlock_irq(&current->sighand->siglock);
494 }
496 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
497 struct sigaction *sa)
498 {
499 switch (regs->u_regs[UREG_I0]) {
500 case ERESTART_RESTARTBLOCK:
501 case ERESTARTNOHAND:
502 no_system_call_restart:
503 regs->u_regs[UREG_I0] = EINTR;
504 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
505 break;
506 case ERESTARTSYS:
507 if (!(sa->sa_flags & SA_RESTART))
508 goto no_system_call_restart;
509 /* fallthrough */
510 case ERESTARTNOINTR:
511 regs->u_regs[UREG_I0] = orig_i0;
512 regs->tpc -= 4;
513 regs->tnpc -= 4;
514 }
515 }
517 /* Note that 'init' is a special process: it doesn't get signals it doesn't
518 * want to handle. Thus you cannot kill init even with a SIGKILL even by
519 * mistake.
520 */
521 static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
522 {
523 siginfo_t info;
524 struct signal_deliver_cookie cookie;
525 struct k_sigaction ka;
526 int signr;
527 sigset_t *oldset;
529 cookie.restart_syscall = restart_syscall;
530 cookie.orig_i0 = orig_i0;
532 if (test_thread_flag(TIF_RESTORE_SIGMASK))
533 oldset = &current->saved_sigmask;
534 else
535 oldset = &current->blocked;
537 #ifdef CONFIG_SPARC32_COMPAT
538 if (test_thread_flag(TIF_32BIT)) {
539 extern void do_signal32(sigset_t *, struct pt_regs *,
540 unsigned long, int);
541 do_signal32(oldset, regs, orig_i0,
542 cookie.restart_syscall);
543 return;
544 }
545 #endif
547 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
548 if (signr > 0) {
549 if (cookie.restart_syscall)
550 syscall_restart(orig_i0, regs, &ka.sa);
551 handle_signal(signr, &ka, &info, oldset, regs);
553 /* a signal was successfully delivered; the saved
554 * sigmask will have been stored in the signal frame,
555 * and will be restored by sigreturn, so we can simply
556 * clear the TIF_RESTORE_SIGMASK flag.
557 */
558 if (test_thread_flag(TIF_RESTORE_SIGMASK))
559 clear_thread_flag(TIF_RESTORE_SIGMASK);
560 return;
561 }
562 if (cookie.restart_syscall &&
563 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
564 regs->u_regs[UREG_I0] == ERESTARTSYS ||
565 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
566 /* replay the system call when we are done */
567 regs->u_regs[UREG_I0] = cookie.orig_i0;
568 regs->tpc -= 4;
569 regs->tnpc -= 4;
570 }
571 if (cookie.restart_syscall &&
572 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
573 regs->u_regs[UREG_G1] = __NR_restart_syscall;
574 regs->tpc -= 4;
575 regs->tnpc -= 4;
576 }
578 /* if there's no signal to deliver, we just put the saved sigmask
579 * back
580 */
581 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
582 clear_thread_flag(TIF_RESTORE_SIGMASK);
583 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
584 }
585 }
587 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
588 unsigned long thread_info_flags)
589 {
590 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
591 do_signal(regs, orig_i0, restart_syscall);
592 }
594 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
595 {
596 struct signal_deliver_cookie *cp = cookie;
598 if (cp->restart_syscall &&
599 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
600 regs->u_regs[UREG_I0] == ERESTARTSYS ||
601 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
602 /* replay the system call when we are done */
603 regs->u_regs[UREG_I0] = cp->orig_i0;
604 regs->tpc -= 4;
605 regs->tnpc -= 4;
606 cp->restart_syscall = 0;
607 }
608 if (cp->restart_syscall &&
609 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
610 regs->u_regs[UREG_G1] = __NR_restart_syscall;
611 regs->tpc -= 4;
612 regs->tnpc -= 4;
613 cp->restart_syscall = 0;
614 }
615 }