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[SPARC]: Add support for *at(), ppoll, and pselect syscalls.
[deliverable/linux.git] / arch / sparc64 / kernel / signal.c
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 */
10
11 #include <linux/config.h>
12 #ifdef CONFIG_SPARC32_COMPAT
13 #include <linux/compat.h> /* for compat_old_sigset_t */
14 #endif
15 #include <linux/sched.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/unistd.h>
22 #include <linux/mm.h>
23 #include <linux/tty.h>
24 #include <linux/smp_lock.h>
25 #include <linux/binfmts.h>
26 #include <linux/bitops.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/ptrace.h>
30 #include <asm/svr4.h>
31 #include <asm/pgtable.h>
32 #include <asm/fpumacro.h>
33 #include <asm/uctx.h>
34 #include <asm/siginfo.h>
35 #include <asm/visasm.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 /* Align macros */
240 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
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 set_thread_flag(TIF_RESTORE_SIGMASK);
254 return -ERESTARTNOHAND;
255 }
256
257 asmlinkage long sys_sigpause(unsigned int set)
258 {
259 return _sigpause_common(set);
260 }
261
262 asmlinkage long sys_sigsuspend(old_sigset_t set)
263 {
264 return _sigpause_common(set);
265 }
266
267 static inline int
268 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
269 {
270 unsigned long *fpregs = current_thread_info()->fpregs;
271 unsigned long fprs;
272 int err;
273
274 err = __get_user(fprs, &fpu->si_fprs);
275 fprs_write(0);
276 regs->tstate &= ~TSTATE_PEF;
277 if (fprs & FPRS_DL)
278 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
279 (sizeof(unsigned int) * 32));
280 if (fprs & FPRS_DU)
281 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
282 (sizeof(unsigned int) * 32));
283 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
284 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
285 current_thread_info()->fpsaved[0] |= fprs;
286 return err;
287 }
288
289 void do_rt_sigreturn(struct pt_regs *regs)
290 {
291 struct rt_signal_frame __user *sf;
292 unsigned long tpc, tnpc, tstate;
293 __siginfo_fpu_t __user *fpu_save;
294 mm_segment_t old_fs;
295 sigset_t set;
296 stack_t st;
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 |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
333
334 if (err)
335 goto segv;
336
337 regs->tpc = tpc;
338 regs->tnpc = tnpc;
339
340 /* It is more difficult to avoid calling this function than to
341 call it and ignore errors. */
342 old_fs = get_fs();
343 set_fs(KERNEL_DS);
344 do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
345 set_fs(old_fs);
346
347 sigdelsetmask(&set, ~_BLOCKABLE);
348 spin_lock_irq(&current->sighand->siglock);
349 current->blocked = set;
350 recalc_sigpending();
351 spin_unlock_irq(&current->sighand->siglock);
352 return;
353 segv:
354 force_sig(SIGSEGV, current);
355 }
356
357 /* Checks if the fp is valid */
358 static int invalid_frame_pointer(void __user *fp, int fplen)
359 {
360 if (((unsigned long) fp) & 7)
361 return 1;
362 return 0;
363 }
364
365 static inline int
366 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
367 {
368 unsigned long *fpregs = (unsigned long *)(regs+1);
369 unsigned long fprs;
370 int err = 0;
371
372 fprs = current_thread_info()->fpsaved[0];
373 if (fprs & FPRS_DL)
374 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
375 (sizeof(unsigned int) * 32));
376 if (fprs & FPRS_DU)
377 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
378 (sizeof(unsigned int) * 32));
379 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
380 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
381 err |= __put_user(fprs, &fpu->si_fprs);
382
383 return err;
384 }
385
386 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
387 {
388 unsigned long sp;
389
390 sp = regs->u_regs[UREG_FP] + STACK_BIAS;
391
392 /* This is the X/Open sanctioned signal stack switching. */
393 if (ka->sa.sa_flags & SA_ONSTACK) {
394 if (!on_sig_stack(sp) &&
395 !((current->sas_ss_sp + current->sas_ss_size) & 7))
396 sp = current->sas_ss_sp + current->sas_ss_size;
397 }
398 return (void __user *)(sp - framesize);
399 }
400
401 static inline void
402 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
403 int signo, sigset_t *oldset, siginfo_t *info)
404 {
405 struct rt_signal_frame __user *sf;
406 int sigframe_size, err;
407
408 /* 1. Make sure everything is clean */
409 synchronize_user_stack();
410 save_and_clear_fpu();
411
412 sigframe_size = RT_ALIGNEDSZ;
413 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
414 sigframe_size -= sizeof(__siginfo_fpu_t);
415
416 sf = (struct rt_signal_frame __user *)
417 get_sigframe(ka, regs, sigframe_size);
418
419 if (invalid_frame_pointer (sf, sigframe_size))
420 goto sigill;
421
422 if (get_thread_wsaved() != 0)
423 goto sigill;
424
425 /* 2. Save the current process state */
426 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
427
428 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
429 err |= save_fpu_state(regs, &sf->fpu_state);
430 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
431 } else {
432 err |= __put_user(0, &sf->fpu_save);
433 }
434
435 /* Setup sigaltstack */
436 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
437 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
438 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
439
440 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
441
442 err |= copy_in_user((u64 __user *)sf,
443 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
444 sizeof(struct reg_window));
445
446 if (info)
447 err |= copy_siginfo_to_user(&sf->info, info);
448 else {
449 err |= __put_user(signo, &sf->info.si_signo);
450 err |= __put_user(SI_NOINFO, &sf->info.si_code);
451 }
452 if (err)
453 goto sigsegv;
454
455 /* 3. signal handler back-trampoline and parameters */
456 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
457 regs->u_regs[UREG_I0] = signo;
458 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
459
460 /* The sigcontext is passed in this way because of how it
461 * is defined in GLIBC's /usr/include/bits/sigcontext.h
462 * for sparc64. It includes the 128 bytes of siginfo_t.
463 */
464 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
465
466 /* 5. signal handler */
467 regs->tpc = (unsigned long) ka->sa.sa_handler;
468 regs->tnpc = (regs->tpc + 4);
469 if (test_thread_flag(TIF_32BIT)) {
470 regs->tpc &= 0xffffffff;
471 regs->tnpc &= 0xffffffff;
472 }
473 /* 4. return to kernel instructions */
474 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
475 return;
476
477 sigill:
478 do_exit(SIGILL);
479 sigsegv:
480 force_sigsegv(signo, current);
481 }
482
483 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
484 siginfo_t *info,
485 sigset_t *oldset, struct pt_regs *regs)
486 {
487 setup_rt_frame(ka, regs, signr, oldset,
488 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
489 spin_lock_irq(&current->sighand->siglock);
490 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
491 if (!(ka->sa.sa_flags & SA_NOMASK))
492 sigaddset(&current->blocked,signr);
493 recalc_sigpending();
494 spin_unlock_irq(&current->sighand->siglock);
495 }
496
497 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
498 struct sigaction *sa)
499 {
500 switch (regs->u_regs[UREG_I0]) {
501 case ERESTART_RESTARTBLOCK:
502 case ERESTARTNOHAND:
503 no_system_call_restart:
504 regs->u_regs[UREG_I0] = EINTR;
505 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
506 break;
507 case ERESTARTSYS:
508 if (!(sa->sa_flags & SA_RESTART))
509 goto no_system_call_restart;
510 /* fallthrough */
511 case ERESTARTNOINTR:
512 regs->u_regs[UREG_I0] = orig_i0;
513 regs->tpc -= 4;
514 regs->tnpc -= 4;
515 }
516 }
517
518 /* Note that 'init' is a special process: it doesn't get signals it doesn't
519 * want to handle. Thus you cannot kill init even with a SIGKILL even by
520 * mistake.
521 */
522 static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
523 {
524 siginfo_t info;
525 struct signal_deliver_cookie cookie;
526 struct k_sigaction ka;
527 int signr;
528 sigset_t *oldset;
529
530 cookie.restart_syscall = restart_syscall;
531 cookie.orig_i0 = orig_i0;
532
533 if (test_thread_flag(TIF_RESTORE_SIGMASK))
534 oldset = &current->saved_sigmask;
535 else
536 oldset = &current->blocked;
537
538 #ifdef CONFIG_SPARC32_COMPAT
539 if (test_thread_flag(TIF_32BIT)) {
540 extern void do_signal32(sigset_t *, struct pt_regs *,
541 unsigned long, int);
542 do_signal32(oldset, regs, orig_i0,
543 cookie.restart_syscall);
544 return;
545 }
546 #endif
547
548 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
549 if (signr > 0) {
550 if (cookie.restart_syscall)
551 syscall_restart(orig_i0, regs, &ka.sa);
552 handle_signal(signr, &ka, &info, oldset, regs);
553
554 /* a signal was successfully delivered; the saved
555 * sigmask will have been stored in the signal frame,
556 * and will be restored by sigreturn, so we can simply
557 * clear the TIF_RESTORE_SIGMASK flag.
558 */
559 if (test_thread_flag(TIF_RESTORE_SIGMASK))
560 clear_thread_flag(TIF_RESTORE_SIGMASK);
561 return;
562 }
563 if (cookie.restart_syscall &&
564 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
565 regs->u_regs[UREG_I0] == ERESTARTSYS ||
566 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
567 /* replay the system call when we are done */
568 regs->u_regs[UREG_I0] = cookie.orig_i0;
569 regs->tpc -= 4;
570 regs->tnpc -= 4;
571 }
572 if (cookie.restart_syscall &&
573 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
574 regs->u_regs[UREG_G1] = __NR_restart_syscall;
575 regs->tpc -= 4;
576 regs->tnpc -= 4;
577 }
578
579 /* if there's no signal to deliver, we just put the saved sigmask
580 * back
581 */
582 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
583 clear_thread_flag(TIF_RESTORE_SIGMASK);
584 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
585 }
586 }
587
588 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
589 unsigned long thread_info_flags)
590 {
591 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
592 do_signal(regs, orig_i0, restart_syscall);
593 }
594
595 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
596 {
597 struct signal_deliver_cookie *cp = cookie;
598
599 if (cp->restart_syscall &&
600 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
601 regs->u_regs[UREG_I0] == ERESTARTSYS ||
602 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
603 /* replay the system call when we are done */
604 regs->u_regs[UREG_I0] = cp->orig_i0;
605 regs->tpc -= 4;
606 regs->tnpc -= 4;
607 cp->restart_syscall = 0;
608 }
609 if (cp->restart_syscall &&
610 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
611 regs->u_regs[UREG_G1] = __NR_restart_syscall;
612 regs->tpc -= 4;
613 regs->tnpc -= 4;
614 cp->restart_syscall = 0;
615 }
616 }
Linux kernel - Deliverables
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