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V4L/DVB (5913): Clean up duplicate includes in include/media/
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / sparc64 / kernel / signal.c
blobfb13775b36823b7f5cdbd707026c9782a0aaf291
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 #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/binfmts.h>
24 #include <linux/bitops.h>
25
26 #include <asm/uaccess.h>
27 #include <asm/ptrace.h>
28 #include <asm/svr4.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 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
36
37 /* {set, get}context() needed for 64-bit SparcLinux userland. */
38 asmlinkage void sparc64_set_context(struct pt_regs *regs)
39 {
40 struct ucontext __user *ucp = (struct ucontext __user *)
41 regs->u_regs[UREG_I0];
42 mc_gregset_t __user *grp;
43 unsigned long pc, npc, tstate;
44 unsigned long fp, i7;
45 unsigned char fenab;
46 int err;
47
48 flush_user_windows();
49 if (get_thread_wsaved() ||
50 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
51 (!__access_ok(ucp, sizeof(*ucp))))
52 goto do_sigsegv;
53 grp = &ucp->uc_mcontext.mc_gregs;
54 err = __get_user(pc, &((*grp)[MC_PC]));
55 err |= __get_user(npc, &((*grp)[MC_NPC]));
56 if (err || ((pc | npc) & 3))
57 goto do_sigsegv;
58 if (regs->u_regs[UREG_I1]) {
59 sigset_t set;
60
61 if (_NSIG_WORDS == 1) {
62 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
63 goto do_sigsegv;
64 } else {
65 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
66 goto do_sigsegv;
67 }
68 sigdelsetmask(&set, ~_BLOCKABLE);
69 spin_lock_irq(&current->sighand->siglock);
70 current->blocked = set;
71 recalc_sigpending();
72 spin_unlock_irq(&current->sighand->siglock);
73 }
74 if (test_thread_flag(TIF_32BIT)) {
75 pc &= 0xffffffff;
76 npc &= 0xffffffff;
77 }
78 regs->tpc = pc;
79 regs->tnpc = npc;
80 err |= __get_user(regs->y, &((*grp)[MC_Y]));
81 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
82 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
83 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
84 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
85 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
86 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
87 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
88 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
89 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
90 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
91 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
92 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
93 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
94 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
95 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
96 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
97 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
98 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
99
100 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
101 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
102 err |= __put_user(fp,
103 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
104 err |= __put_user(i7,
105 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
106
107 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
108 if (fenab) {
109 unsigned long *fpregs = current_thread_info()->fpregs;
110 unsigned long fprs;
111
112 fprs_write(0);
113 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
114 if (fprs & FPRS_DL)
115 err |= copy_from_user(fpregs,
116 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
117 (sizeof(unsigned int) * 32));
118 if (fprs & FPRS_DU)
119 err |= copy_from_user(fpregs+16,
120 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
121 (sizeof(unsigned int) * 32));
122 err |= __get_user(current_thread_info()->xfsr[0],
123 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
124 err |= __get_user(current_thread_info()->gsr[0],
125 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
126 regs->tstate &= ~TSTATE_PEF;
127 }
128 if (err)
129 goto do_sigsegv;
130
131 return;
132 do_sigsegv:
133 force_sig(SIGSEGV, current);
134 }
135
136 asmlinkage void sparc64_get_context(struct pt_regs *regs)
137 {
138 struct ucontext __user *ucp = (struct ucontext __user *)
139 regs->u_regs[UREG_I0];
140 mc_gregset_t __user *grp;
141 mcontext_t __user *mcp;
142 unsigned long fp, i7;
143 unsigned char fenab;
144 int err;
145
146 synchronize_user_stack();
147 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
148 goto do_sigsegv;
149
150 #if 1
151 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
152 #else
153 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
154 #endif
155
156 mcp = &ucp->uc_mcontext;
157 grp = &mcp->mc_gregs;
158
159 /* Skip over the trap instruction, first. */
160 if (test_thread_flag(TIF_32BIT)) {
161 regs->tpc = (regs->tnpc & 0xffffffff);
162 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
163 } else {
164 regs->tpc = regs->tnpc;
165 regs->tnpc += 4;
166 }
167 err = 0;
168 if (_NSIG_WORDS == 1)
169 err |= __put_user(current->blocked.sig[0],
170 (unsigned long __user *)&ucp->uc_sigmask);
171 else
172 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
173 sizeof(sigset_t));
174
175 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
176 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
177 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
178 err |= __put_user(regs->y, &((*grp)[MC_Y]));
179 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
180 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
181 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
182 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
183 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
184 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
185 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
186 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
187 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
188 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
189 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
190 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
191 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
192 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
193 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
194
195 err |= __get_user(fp,
196 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
197 err |= __get_user(i7,
198 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
199 err |= __put_user(fp, &(mcp->mc_fp));
200 err |= __put_user(i7, &(mcp->mc_i7));
201
202 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
203 if (fenab) {
204 unsigned long *fpregs = current_thread_info()->fpregs;
205 unsigned long fprs;
206
207 fprs = current_thread_info()->fpsaved[0];
208 if (fprs & FPRS_DL)
209 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
210 (sizeof(unsigned int) * 32));
211 if (fprs & FPRS_DU)
212 err |= copy_to_user(
213 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
214 (sizeof(unsigned int) * 32));
215 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
216 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
217 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
218 }
219 if (err)
220 goto do_sigsegv;
221
222 return;
223 do_sigsegv:
224 force_sig(SIGSEGV, current);
225 }
226
227 struct rt_signal_frame {
228 struct sparc_stackf ss;
229 siginfo_t info;
230 struct pt_regs regs;
231 __siginfo_fpu_t __user *fpu_save;
232 stack_t stack;
233 sigset_t mask;
234 __siginfo_fpu_t fpu_state;
235 };
236
237 /* Align macros */
238 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
239
240 static long _sigpause_common(old_sigset_t set)
241 {
242 set &= _BLOCKABLE;
243 spin_lock_irq(&current->sighand->siglock);
244 current->saved_sigmask = current->blocked;
245 siginitset(&current->blocked, set);
246 recalc_sigpending();
247 spin_unlock_irq(&current->sighand->siglock);
248
249 current->state = TASK_INTERRUPTIBLE;
250 schedule();
251 set_thread_flag(TIF_RESTORE_SIGMASK);
252 return -ERESTARTNOHAND;
253 }
254
255 asmlinkage long sys_sigpause(unsigned int set)
256 {
257 return _sigpause_common(set);
258 }
259
260 asmlinkage long sys_sigsuspend(old_sigset_t set)
261 {
262 return _sigpause_common(set);
263 }
264
265 static inline int
266 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
267 {
268 unsigned long *fpregs = current_thread_info()->fpregs;
269 unsigned long fprs;
270 int err;
271
272 err = __get_user(fprs, &fpu->si_fprs);
273 fprs_write(0);
274 regs->tstate &= ~TSTATE_PEF;
275 if (fprs & FPRS_DL)
276 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
277 (sizeof(unsigned int) * 32));
278 if (fprs & FPRS_DU)
279 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
280 (sizeof(unsigned int) * 32));
281 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
282 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
283 current_thread_info()->fpsaved[0] |= fprs;
284 return err;
285 }
286
287 void do_rt_sigreturn(struct pt_regs *regs)
288 {
289 struct rt_signal_frame __user *sf;
290 unsigned long tpc, tnpc, tstate;
291 __siginfo_fpu_t __user *fpu_save;
292 sigset_t set;
293 int err;
294
295 /* Always make any pending restarted system calls return -EINTR */
296 current_thread_info()->restart_block.fn = do_no_restart_syscall;
297
298 synchronize_user_stack ();
299 sf = (struct rt_signal_frame __user *)
300 (regs->u_regs [UREG_FP] + STACK_BIAS);
301
302 /* 1. Make sure we are not getting garbage from the user */
303 if (((unsigned long) sf) & 3)
304 goto segv;
305
306 err = get_user(tpc, &sf->regs.tpc);
307 err |= __get_user(tnpc, &sf->regs.tnpc);
308 if (test_thread_flag(TIF_32BIT)) {
309 tpc &= 0xffffffff;
310 tnpc &= 0xffffffff;
311 }
312 err |= ((tpc | tnpc) & 3);
313
314 /* 2. Restore the state */
315 err |= __get_user(regs->y, &sf->regs.y);
316 err |= __get_user(tstate, &sf->regs.tstate);
317 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
318
319 /* User can only change condition codes and %asi in %tstate. */
320 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
321 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
322
323 err |= __get_user(fpu_save, &sf->fpu_save);
324 if (fpu_save)
325 err |= restore_fpu_state(regs, &sf->fpu_state);
326
327 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
328 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
329
330 if (err)
331 goto segv;
332
333 regs->tpc = tpc;
334 regs->tnpc = tnpc;
335
336 sigdelsetmask(&set, ~_BLOCKABLE);
337 spin_lock_irq(&current->sighand->siglock);
338 current->blocked = set;
339 recalc_sigpending();
340 spin_unlock_irq(&current->sighand->siglock);
341 return;
342 segv:
343 force_sig(SIGSEGV, current);
344 }
345
346 /* Checks if the fp is valid */
347 static int invalid_frame_pointer(void __user *fp, int fplen)
348 {
349 if (((unsigned long) fp) & 7)
350 return 1;
351 return 0;
352 }
353
354 static inline int
355 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
356 {
357 unsigned long *fpregs = (unsigned long *)(regs+1);
358 unsigned long fprs;
359 int err = 0;
360
361 fprs = current_thread_info()->fpsaved[0];
362 if (fprs & FPRS_DL)
363 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
364 (sizeof(unsigned int) * 32));
365 if (fprs & FPRS_DU)
366 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
367 (sizeof(unsigned int) * 32));
368 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
369 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
370 err |= __put_user(fprs, &fpu->si_fprs);
371
372 return err;
373 }
374
375 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
376 {
377 unsigned long sp;
378
379 sp = regs->u_regs[UREG_FP] + STACK_BIAS;
380
381 /* This is the X/Open sanctioned signal stack switching. */
382 if (ka->sa.sa_flags & SA_ONSTACK) {
383 if (!on_sig_stack(sp) &&
384 !((current->sas_ss_sp + current->sas_ss_size) & 7))
385 sp = current->sas_ss_sp + current->sas_ss_size;
386 }
387 return (void __user *)(sp - framesize);
388 }
389
390 static inline void
391 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
392 int signo, sigset_t *oldset, siginfo_t *info)
393 {
394 struct rt_signal_frame __user *sf;
395 int sigframe_size, err;
396
397 /* 1. Make sure everything is clean */
398 synchronize_user_stack();
399 save_and_clear_fpu();
400
401 sigframe_size = RT_ALIGNEDSZ;
402 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
403 sigframe_size -= sizeof(__siginfo_fpu_t);
404
405 sf = (struct rt_signal_frame __user *)
406 get_sigframe(ka, regs, sigframe_size);
407
408 if (invalid_frame_pointer (sf, sigframe_size))
409 goto sigill;
410
411 if (get_thread_wsaved() != 0)
412 goto sigill;
413
414 /* 2. Save the current process state */
415 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
416
417 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
418 err |= save_fpu_state(regs, &sf->fpu_state);
419 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
420 } else {
421 err |= __put_user(0, &sf->fpu_save);
422 }
423
424 /* Setup sigaltstack */
425 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
426 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
427 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
428
429 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
430
431 err |= copy_in_user((u64 __user *)sf,
432 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
433 sizeof(struct reg_window));
434
435 if (info)
436 err |= copy_siginfo_to_user(&sf->info, info);
437 else {
438 err |= __put_user(signo, &sf->info.si_signo);
439 err |= __put_user(SI_NOINFO, &sf->info.si_code);
440 }
441 if (err)
442 goto sigsegv;
443
444 /* 3. signal handler back-trampoline and parameters */
445 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
446 regs->u_regs[UREG_I0] = signo;
447 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
448
449 /* The sigcontext is passed in this way because of how it
450 * is defined in GLIBC's /usr/include/bits/sigcontext.h
451 * for sparc64. It includes the 128 bytes of siginfo_t.
452 */
453 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
454
455 /* 5. signal handler */
456 regs->tpc = (unsigned long) ka->sa.sa_handler;
457 regs->tnpc = (regs->tpc + 4);
458 if (test_thread_flag(TIF_32BIT)) {
459 regs->tpc &= 0xffffffff;
460 regs->tnpc &= 0xffffffff;
461 }
462 /* 4. return to kernel instructions */
463 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
464 return;
465
466 sigill:
467 do_exit(SIGILL);
468 sigsegv:
469 force_sigsegv(signo, current);
470 }
471
472 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
473 siginfo_t *info,
474 sigset_t *oldset, struct pt_regs *regs)
475 {
476 setup_rt_frame(ka, regs, signr, oldset,
477 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
478 spin_lock_irq(&current->sighand->siglock);
479 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
480 if (!(ka->sa.sa_flags & SA_NOMASK))
481 sigaddset(&current->blocked,signr);
482 recalc_sigpending();
483 spin_unlock_irq(&current->sighand->siglock);
484 }
485
486 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
487 struct sigaction *sa)
488 {
489 switch (regs->u_regs[UREG_I0]) {
490 case ERESTART_RESTARTBLOCK:
491 case ERESTARTNOHAND:
492 no_system_call_restart:
493 regs->u_regs[UREG_I0] = EINTR;
494 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
495 break;
496 case ERESTARTSYS:
497 if (!(sa->sa_flags & SA_RESTART))
498 goto no_system_call_restart;
499 /* fallthrough */
500 case ERESTARTNOINTR:
501 regs->u_regs[UREG_I0] = orig_i0;
502 regs->tpc -= 4;
503 regs->tnpc -= 4;
504 }
505 }
506
507 /* Note that 'init' is a special process: it doesn't get signals it doesn't
508 * want to handle. Thus you cannot kill init even with a SIGKILL even by
509 * mistake.
510 */
511 static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
512 {
513 siginfo_t info;
514 struct signal_deliver_cookie cookie;
515 struct k_sigaction ka;
516 int signr;
517 sigset_t *oldset;
518
519 cookie.restart_syscall = restart_syscall;
520 cookie.orig_i0 = orig_i0;
521
522 if (test_thread_flag(TIF_RESTORE_SIGMASK))
523 oldset = &current->saved_sigmask;
524 else
525 oldset = &current->blocked;
526
527 #ifdef CONFIG_SPARC32_COMPAT
528 if (test_thread_flag(TIF_32BIT)) {
529 extern void do_signal32(sigset_t *, struct pt_regs *,
530 unsigned long, int);
531 do_signal32(oldset, regs, orig_i0,
532 cookie.restart_syscall);
533 return;
534 }
535 #endif
536
537 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
538 if (signr > 0) {
539 if (cookie.restart_syscall)
540 syscall_restart(orig_i0, regs, &ka.sa);
541 handle_signal(signr, &ka, &info, oldset, regs);
542
543 /* a signal was successfully delivered; the saved
544 * sigmask will have been stored in the signal frame,
545 * and will be restored by sigreturn, so we can simply
546 * clear the TIF_RESTORE_SIGMASK flag.
547 */
548 if (test_thread_flag(TIF_RESTORE_SIGMASK))
549 clear_thread_flag(TIF_RESTORE_SIGMASK);
550 return;
551 }
552 if (cookie.restart_syscall &&
553 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
554 regs->u_regs[UREG_I0] == ERESTARTSYS ||
555 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
556 /* replay the system call when we are done */
557 regs->u_regs[UREG_I0] = cookie.orig_i0;
558 regs->tpc -= 4;
559 regs->tnpc -= 4;
560 }
561 if (cookie.restart_syscall &&
562 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
563 regs->u_regs[UREG_G1] = __NR_restart_syscall;
564 regs->tpc -= 4;
565 regs->tnpc -= 4;
566 }
567
568 /* if there's no signal to deliver, we just put the saved sigmask
569 * back
570 */
571 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
572 clear_thread_flag(TIF_RESTORE_SIGMASK);
573 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
574 }
575 }
576
577 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
578 unsigned long thread_info_flags)
579 {
580 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
581 do_signal(regs, orig_i0, restart_syscall);
582 }
583
584 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
585 {
586 struct signal_deliver_cookie *cp = cookie;
587
588 if (cp->restart_syscall &&
589 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
590 regs->u_regs[UREG_I0] == ERESTARTSYS ||
591 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
592 /* replay the system call when we are done */
593 regs->u_regs[UREG_I0] = cp->orig_i0;
594 regs->tpc -= 4;
595 regs->tnpc -= 4;
596 cp->restart_syscall = 0;
597 }
598 if (cp->restart_syscall &&
599 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
600 regs->u_regs[UREG_G1] = __NR_restart_syscall;
601 regs->tpc -= 4;
602 regs->tnpc -= 4;
603 cp->restart_syscall = 0;
604 }
605 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree