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Import 2.3.41pre2
[davej-history.git] / arch / sparc / kernel / signal.c
blob98b54240252cf10936313becff9f526517a90585
1 /* $Id: signal.c,v 1.101 2000/01/21 11:38:38 jj Exp $
2 * linux/arch/sparc/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 */
9
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
12 #include <linux/signal.h>
13 #include <linux/errno.h>
14 #include <linux/wait.h>
15 #include <linux/ptrace.h>
16 #include <linux/unistd.h>
17 #include <linux/mm.h>
18 #include <linux/smp.h>
19 #include <linux/smp_lock.h>
20
21 #include <asm/uaccess.h>
22 #include <asm/bitops.h>
23 #include <asm/ptrace.h>
24 #include <asm/svr4.h>
25 #include <asm/pgalloc.h>
26 #include <asm/pgtable.h>
27
28 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
29
30 asmlinkage int sys_wait4(pid_t pid, unsigned long *stat_addr,
31 int options, unsigned long *ru);
32
33 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
34 void *fpqueue, unsigned long *fpqdepth);
35 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
36
37 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
38 unsigned long orig_o0, int ret_from_syscall);
39
40 /* This turned off for production... */
41 /* #define DEBUG_SIGNALS 1 */
42 /* #define DEBUG_SIGNALS_TRACE 1 */
43 /* #define DEBUG_SIGNALS_MAPS 1 */
44
45 /* Signal frames: the original one (compatible with SunOS):
46 *
47 * Set up a signal frame... Make the stack look the way SunOS
48 * expects it to look which is basically:
49 *
50 * ---------------------------------- <-- %sp at signal time
51 * Struct sigcontext
52 * Signal address
53 * Ptr to sigcontext area above
54 * Signal code
55 * The signal number itself
56 * One register window
57 * ---------------------------------- <-- New %sp
58 */
59 struct signal_sframe {
60 struct reg_window sig_window;
61 int sig_num;
62 int sig_code;
63 struct sigcontext *sig_scptr;
64 int sig_address;
65 struct sigcontext sig_context;
66 unsigned int extramask[_NSIG_WORDS - 1];
67 };
68
69 /*
70 * And the new one, intended to be used for Linux applications only
71 * (we have enough in there to work with clone).
72 * All the interesting bits are in the info field.
73 */
74
75 struct new_signal_frame {
76 struct sparc_stackf ss;
77 __siginfo_t info;
78 __siginfo_fpu_t *fpu_save;
79 unsigned long insns [2] __attribute__ ((aligned (8)));
80 unsigned int extramask[_NSIG_WORDS - 1];
81 unsigned int extra_size; /* Should be 0 */
82 __siginfo_fpu_t fpu_state;
83 };
84
85 struct rt_signal_frame {
86 struct sparc_stackf ss;
87 siginfo_t info;
88 struct pt_regs regs;
89 sigset_t mask;
90 __siginfo_fpu_t *fpu_save;
91 unsigned int insns [2];
92 stack_t stack;
93 unsigned int extra_size; /* Should be 0 */
94 __siginfo_fpu_t fpu_state;
95 };
96
97 /* Align macros */
98 #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7)))
99 #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7)))
100 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
101
102 /*
103 * atomically swap in the new signal mask, and wait for a signal.
104 * This is really tricky on the Sparc, watch out...
105 */
106 asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
107 {
108 sigset_t saveset;
109
110 set &= _BLOCKABLE;
111 spin_lock_irq(&current->sigmask_lock);
112 saveset = current->blocked;
113 siginitset(&current->blocked, set);
114 recalc_sigpending(current);
115 spin_unlock_irq(&current->sigmask_lock);
116
117 regs->pc = regs->npc;
118 regs->npc += 4;
119
120 /* Condition codes and return value where set here for sigpause,
121 * and so got used by setup_frame, which again causes sigreturn()
122 * to return -EINTR.
123 */
124 while (1) {
125 current->state = TASK_INTERRUPTIBLE;
126 schedule();
127 /*
128 * Return -EINTR and set condition code here,
129 * so the interrupted system call actually returns
130 * these.
131 */
132 regs->psr |= PSR_C;
133 regs->u_regs[UREG_I0] = EINTR;
134 if (do_signal(&saveset, regs, 0, 0))
135 return;
136 }
137 }
138
139 asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
140 {
141 _sigpause_common(set, regs);
142 }
143
144 asmlinkage void do_sigsuspend (struct pt_regs *regs)
145 {
146 _sigpause_common(regs->u_regs[UREG_I0], regs);
147 }
148
149 asmlinkage void do_rt_sigsuspend(sigset_t *uset, size_t sigsetsize,
150 struct pt_regs *regs)
151 {
152 sigset_t oldset, set;
153
154 /* XXX: Don't preclude handling different sized sigset_t's. */
155 if (sigsetsize != sizeof(sigset_t)) {
156 regs->psr |= PSR_C;
157 regs->u_regs[UREG_I0] = EINVAL;
158 return;
159 }
160
161 if (copy_from_user(&set, uset, sizeof(set))) {
162 regs->psr |= PSR_C;
163 regs->u_regs[UREG_I0] = EFAULT;
164 return;
165 }
166
167 sigdelsetmask(&set, ~_BLOCKABLE);
168 spin_lock_irq(&current->sigmask_lock);
169 oldset = current->blocked;
170 current->blocked = set;
171 recalc_sigpending(current);
172 spin_unlock_irq(&current->sigmask_lock);
173
174 regs->pc = regs->npc;
175 regs->npc += 4;
176
177 /* Condition codes and return value where set here for sigpause,
178 * and so got used by setup_frame, which again causes sigreturn()
179 * to return -EINTR.
180 */
181 while (1) {
182 current->state = TASK_INTERRUPTIBLE;
183 schedule();
184 /*
185 * Return -EINTR and set condition code here,
186 * so the interrupted system call actually returns
187 * these.
188 */
189 regs->psr |= PSR_C;
190 regs->u_regs[UREG_I0] = EINTR;
191 if (do_signal(&oldset, regs, 0, 0))
192 return;
193 }
194 }
195
196 static inline int
197 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu)
198 {
199 int err;
200 #ifdef __SMP__
201 if (current->flags & PF_USEDFPU)
202 regs->psr &= ~PSR_EF;
203 #else
204 if (current == last_task_used_math) {
205 last_task_used_math = 0;
206 regs->psr &= ~PSR_EF;
207 }
208 #endif
209 current->used_math = 1;
210 current->flags &= ~PF_USEDFPU;
211
212 if (verify_area (VERIFY_READ, fpu, sizeof(*fpu)))
213 return -EFAULT;
214
215 err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
216 (sizeof(unsigned long) * 32));
217 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
218 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
219 if (current->thread.fpqdepth != 0)
220 err |= __copy_from_user(&current->thread.fpqueue[0],
221 &fpu->si_fpqueue[0],
222 ((sizeof(unsigned long) +
223 (sizeof(unsigned long *)))*16));
224 return err;
225 }
226
227 static inline void do_new_sigreturn (struct pt_regs *regs)
228 {
229 struct new_signal_frame *sf;
230 unsigned long up_psr, pc, npc;
231 sigset_t set;
232 __siginfo_fpu_t *fpu_save;
233 int err;
234
235 sf = (struct new_signal_frame *) regs->u_regs [UREG_FP];
236
237 /* 1. Make sure we are not getting garbage from the user */
238 if (verify_area (VERIFY_READ, sf, sizeof (*sf)))
239 goto segv_and_exit;
240
241 if (((uint) sf) & 3)
242 goto segv_and_exit;
243
244 err = __get_user(pc, &sf->info.si_regs.pc);
245 err |= __get_user(npc, &sf->info.si_regs.npc);
246
247 if ((pc | npc) & 3)
248 goto segv_and_exit;
249
250 /* 2. Restore the state */
251 up_psr = regs->psr;
252 err |= __copy_from_user(regs, &sf->info.si_regs, sizeof (struct pt_regs));
253
254 /* User can only change condition codes and FPU enabling in %psr. */
255 regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
256 | (regs->psr & (PSR_ICC | PSR_EF));
257
258 err |= __get_user(fpu_save, &sf->fpu_save);
259
260 if (fpu_save)
261 err |= restore_fpu_state(regs, fpu_save);
262
263 /* This is pretty much atomic, no amount locking would prevent
264 * the races which exist anyways.
265 */
266 err |= __get_user(set.sig[0], &sf->info.si_mask);
267 err |= __copy_from_user(&set.sig[1], &sf->extramask,
268 (_NSIG_WORDS-1) * sizeof(unsigned int));
269
270 if (err)
271 goto segv_and_exit;
272
273 sigdelsetmask(&set, ~_BLOCKABLE);
274 spin_lock_irq(&current->sigmask_lock);
275 current->blocked = set;
276 recalc_sigpending(current);
277 spin_unlock_irq(&current->sigmask_lock);
278 return;
279
280 segv_and_exit:
281 do_exit(SIGSEGV);
282 }
283
284 asmlinkage void do_sigreturn(struct pt_regs *regs)
285 {
286 struct sigcontext *scptr;
287 unsigned long pc, npc, psr;
288 sigset_t set;
289 int err;
290
291 synchronize_user_stack();
292
293 if (current->thread.new_signal)
294 return do_new_sigreturn (regs);
295
296 scptr = (struct sigcontext *) regs->u_regs[UREG_I0];
297
298 /* Check sanity of the user arg. */
299 if(verify_area(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
300 (((unsigned long) scptr) & 3))
301 goto segv_and_exit;
302
303 err = __get_user(pc, &scptr->sigc_pc);
304 err |= __get_user(npc, &scptr->sigc_npc);
305
306 if((pc | npc) & 3)
307 goto segv_and_exit;
308
309 /* This is pretty much atomic, no amount locking would prevent
310 * the races which exist anyways.
311 */
312 err |= __get_user(set.sig[0], &scptr->sigc_mask);
313 /* Note that scptr + 1 points to extramask */
314 err |= __copy_from_user(&set.sig[1], scptr + 1,
315 (_NSIG_WORDS - 1) * sizeof(unsigned int));
316
317 if (err)
318 goto segv_and_exit;
319
320 sigdelsetmask(&set, ~_BLOCKABLE);
321 spin_lock_irq(&current->sigmask_lock);
322 current->blocked = set;
323 recalc_sigpending(current);
324 spin_unlock_irq(&current->sigmask_lock);
325
326 regs->pc = pc;
327 regs->npc = npc;
328
329 err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
330 err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
331 err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
332
333 /* User can only change condition codes in %psr. */
334 err |= __get_user(psr, &scptr->sigc_psr);
335 if (err)
336 goto segv_and_exit;
337
338 regs->psr &= ~(PSR_ICC);
339 regs->psr |= (psr & PSR_ICC);
340 return;
341
342 segv_and_exit:
343 send_sig(SIGSEGV, current, 1);
344 }
345
346 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
347 {
348 struct rt_signal_frame *sf;
349 unsigned int psr, pc, npc;
350 __siginfo_fpu_t *fpu_save;
351 sigset_t set;
352 stack_t st;
353 int err;
354
355 synchronize_user_stack();
356 sf = (struct rt_signal_frame *) regs->u_regs[UREG_FP];
357 if(verify_area(VERIFY_READ, sf, sizeof(*sf)) ||
358 (((unsigned long) sf) & 0x03))
359 goto segv;
360
361 err = __get_user(pc, &sf->regs.pc);
362 err |= __get_user(npc, &sf->regs.npc);
363 err |= ((pc | npc) & 0x03);
364
365 err |= __get_user(regs->y, &sf->regs.y);
366 err |= __get_user(psr, &sf->regs.psr);
367
368 err |= __copy_from_user(&regs->u_regs[UREG_G1], &sf->regs.u_regs[UREG_G1], 15*sizeof(u32));
369
370 regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
371
372 err |= __get_user(fpu_save, &sf->fpu_save);
373
374 if(fpu_save)
375 err |= restore_fpu_state(regs, fpu_save);
376 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
377
378 err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
379
380 if (err)
381 goto segv;
382
383 regs->pc = pc;
384 regs->npc = npc;
385
386 /* It is more difficult to avoid calling this function than to
387 call it and ignore errors. */
388 do_sigaltstack(&st, NULL, (unsigned long)sf);
389
390 sigdelsetmask(&set, ~_BLOCKABLE);
391 spin_lock_irq(&current->sigmask_lock);
392 current->blocked = set;
393 recalc_sigpending(current);
394 spin_unlock_irq(&current->sigmask_lock);
395 return;
396 segv:
397 send_sig(SIGSEGV, current, 1);
398 }
399
400 /* Checks if the fp is valid */
401 static inline int invalid_frame_pointer (void *fp, int fplen)
402 {
403 if ((((unsigned long) fp) & 7) ||
404 !__access_ok((unsigned long)fp, fplen) ||
405 ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
406 ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
407 return 1;
408
409 return 0;
410 }
411
412 static inline void *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
413 {
414 unsigned long sp;
415
416 sp = regs->u_regs[UREG_FP];
417
418 /* This is the X/Open sanctioned signal stack switching. */
419 if (sa->sa_flags & SA_ONSTACK) {
420 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
421 sp = current->sas_ss_sp + current->sas_ss_size;
422 }
423 return (void *)(sp - framesize);
424 }
425
426 static inline void
427 setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
428 {
429 struct signal_sframe *sframep;
430 struct sigcontext *sc;
431 int window = 0, err;
432 unsigned long pc = regs->pc;
433 unsigned long npc = regs->npc;
434 void *sig_address;
435 int sig_code;
436
437 synchronize_user_stack();
438 sframep = (struct signal_sframe *)get_sigframe(sa, regs, SF_ALIGNEDSZ);
439 if (invalid_frame_pointer (sframep, sizeof(*sframep))){
440 #ifdef DEBUG_SIGNALS /* fills up the console logs during crashme runs, yuck... */
441 printk("%s [%d]: User has trashed signal stack\n",
442 current->comm, current->pid);
443 printk("Sigstack ptr %p handler at pc<%08lx> for sig<%d>\n",
444 sframep, pc, signr);
445 #endif
446 /* Don't change signal code and address, so that
447 * post mortem debuggers can have a look.
448 */
449 goto sigill_and_return;
450 }
451
452 sc = &sframep->sig_context;
453
454 /* We've already made sure frame pointer isn't in kernel space... */
455 err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
456 &sc->sigc_onstack);
457 err |= __put_user(oldset->sig[0], &sc->sigc_mask);
458 err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
459 (_NSIG_WORDS - 1) * sizeof(unsigned int));
460 err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
461 err |= __put_user(pc, &sc->sigc_pc);
462 err |= __put_user(npc, &sc->sigc_npc);
463 err |= __put_user(regs->psr, &sc->sigc_psr);
464 err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
465 err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
466 err |= __put_user(current->thread.w_saved, &sc->sigc_oswins);
467 if(current->thread.w_saved)
468 for(window = 0; window < current->thread.w_saved; window++) {
469 sc->sigc_spbuf[window] =
470 (char *)current->thread.rwbuf_stkptrs[window];
471 err |= __copy_to_user(&sc->sigc_wbuf[window],
472 &current->thread.reg_window[window],
473 sizeof(struct reg_window));
474 }
475 else
476 err |= __copy_to_user(sframep, (char *)regs->u_regs[UREG_FP],
477 sizeof(struct reg_window));
478
479 current->thread.w_saved = 0; /* So process is allowed to execute. */
480
481 err |= __put_user(signr, &sframep->sig_num);
482 sig_address = NULL;
483 sig_code = 0;
484 if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
485 sig_address = info->si_addr;
486 switch (signr) {
487 case SIGSEGV:
488 switch (info->si_code) {
489 case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
490 default: sig_code = SUBSIG_PROTECTION; break;
491 }
492 break;
493 case SIGILL:
494 switch (info->si_code) {
495 case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
496 case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
497 case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP (info->si_trapno); break;
498 default: sig_code = SUBSIG_STACK; break;
499 }
500 break;
501 case SIGFPE:
502 switch (info->si_code) {
503 case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
504 case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
505 case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
506 case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
507 case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
508 case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
509 case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
510 default: sig_code = SUBSIG_FPERROR; break;
511 }
512 break;
513 case SIGBUS:
514 switch (info->si_code) {
515 case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
516 case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
517 default: sig_code = SUBSIG_BUSTIMEOUT; break;
518 }
519 break;
520 case SIGEMT:
521 switch (info->si_code) {
522 case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
523 }
524 break;
525 case SIGSYS:
526 if (info->si_code == (__SI_FAULT|0x100)) {
527 /* See sys_sunos.c */
528 sig_code = info->si_trapno;
529 break;
530 }
531 default:
532 sig_address = NULL;
533 }
534 }
535 err |= __put_user((long)sig_address, &sframep->sig_address);
536 err |= __put_user(sig_code, &sframep->sig_code);
537 err |= __put_user(sc, &sframep->sig_scptr);
538 if (err)
539 goto sigsegv;
540
541 regs->u_regs[UREG_FP] = (unsigned long) sframep;
542 regs->pc = (unsigned long) sa->sa_handler;
543 regs->npc = (regs->pc + 4);
544 return;
545
546 sigill_and_return:
547 do_exit(SIGILL);
548 sigsegv:
549 do_exit(SIGSEGV);
550 }
551
552
553 static inline int
554 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu)
555 {
556 int err = 0;
557 #ifdef __SMP__
558 if (current->flags & PF_USEDFPU) {
559 put_psr(get_psr() | PSR_EF);
560 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
561 &current->thread.fpqueue[0], &current->thread.fpqdepth);
562 regs->psr &= ~(PSR_EF);
563 current->flags &= ~(PF_USEDFPU);
564 }
565 #else
566 if (current == last_task_used_math) {
567 put_psr(get_psr() | PSR_EF);
568 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
569 &current->thread.fpqueue[0], &current->thread.fpqdepth);
570 last_task_used_math = 0;
571 regs->psr &= ~(PSR_EF);
572 }
573 #endif
574 err |= __copy_to_user(&fpu->si_float_regs[0], &current->thread.float_regs[0],
575 (sizeof(unsigned long) * 32));
576 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
577 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
578 if (current->thread.fpqdepth != 0)
579 err |= __copy_to_user(&fpu->si_fpqueue[0], &current->thread.fpqueue[0],
580 ((sizeof(unsigned long) +
581 (sizeof(unsigned long *)))*16));
582 current->used_math = 0;
583 return err;
584 }
585
586 static inline void
587 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
588 int signo, sigset_t *oldset)
589 {
590 struct new_signal_frame *sf;
591 int sigframe_size, err;
592
593 /* 1. Make sure everything is clean */
594 synchronize_user_stack();
595
596 sigframe_size = NF_ALIGNEDSZ;
597 if (!current->used_math)
598 sigframe_size -= sizeof(__siginfo_fpu_t);
599
600 sf = (struct new_signal_frame *)get_sigframe(&ka->sa, regs, sigframe_size);
601
602 if (invalid_frame_pointer (sf, sigframe_size))
603 goto sigill_and_return;
604
605 if (current->thread.w_saved != 0) {
606 #ifdef DEBUG_SIGNALS
607 printk ("%s [%d]: Invalid user stack frame for "
608 "signal delivery.\n", current->comm, current->pid);
609 #endif
610 goto sigill_and_return;
611 }
612
613 /* 2. Save the current process state */
614 err = __copy_to_user(&sf->info.si_regs, regs, sizeof (struct pt_regs));
615
616 err |= __put_user(0, &sf->extra_size);
617
618 if (current->used_math) {
619 err |= save_fpu_state(regs, &sf->fpu_state);
620 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
621 } else {
622 err |= __put_user(0, &sf->fpu_save);
623 }
624
625 err |= __put_user(oldset->sig[0], &sf->info.si_mask);
626 err |= __copy_to_user(sf->extramask, &oldset->sig[1],
627 (_NSIG_WORDS - 1) * sizeof(unsigned int));
628 err |= __copy_to_user(sf, (char *) regs->u_regs [UREG_FP],
629 sizeof (struct reg_window));
630 if (err)
631 goto sigsegv;
632
633 /* 3. signal handler back-trampoline and parameters */
634 regs->u_regs[UREG_FP] = (unsigned long) sf;
635 regs->u_regs[UREG_I0] = signo;
636 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
637
638 /* 4. signal handler */
639 regs->pc = (unsigned long) ka->sa.sa_handler;
640 regs->npc = (regs->pc + 4);
641
642 /* 5. return to kernel instructions */
643 if (ka->ka_restorer)
644 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
645 else {
646 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
647
648 /* mov __NR_sigreturn, %g1 */
649 err |= __put_user(0x821020d8, &sf->insns[0]);
650
651 /* t 0x10 */
652 err |= __put_user(0x91d02010, &sf->insns[1]);
653 if (err)
654 goto sigsegv;
655
656 /* Flush instruction space. */
657 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
658 }
659 return;
660
661 sigill_and_return:
662 do_exit(SIGILL);
663 sigsegv:
664 do_exit(SIGSEGV);
665 }
666
667 static inline void
668 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
669 int signo, sigset_t *oldset, siginfo_t *info)
670 {
671 struct rt_signal_frame *sf;
672 int sigframe_size;
673 unsigned int psr;
674 int err;
675
676 synchronize_user_stack();
677 sigframe_size = RT_ALIGNEDSZ;
678 if(!current->used_math)
679 sigframe_size -= sizeof(__siginfo_fpu_t);
680 sf = (struct rt_signal_frame *)get_sigframe(&ka->sa, regs, sigframe_size);
681 if(invalid_frame_pointer(sf, sigframe_size))
682 goto sigill;
683 if(current->thread.w_saved != 0)
684 goto sigill;
685
686 err = __put_user(regs->pc, &sf->regs.pc);
687 err |= __put_user(regs->npc, &sf->regs.npc);
688 err |= __put_user(regs->y, &sf->regs.y);
689 psr = regs->psr;
690 if(current->used_math)
691 psr |= PSR_EF;
692 err |= __put_user(psr, &sf->regs.psr);
693 err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
694 err |= __put_user(0, &sf->extra_size);
695
696 if(psr & PSR_EF) {
697 err |= save_fpu_state(regs, &sf->fpu_state);
698 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
699 } else {
700 err |= __put_user(0, &sf->fpu_save);
701 }
702 err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
703
704 /* Setup sigaltstack */
705 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
706 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
707 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
708
709 err |= __copy_to_user(sf, (char *) regs->u_regs [UREG_FP],
710 sizeof (struct reg_window));
711
712 err |= __copy_to_user(&sf->info, info, sizeof(siginfo_t));
713
714 if (err)
715 goto sigsegv;
716
717 regs->u_regs[UREG_FP] = (unsigned long) sf;
718 regs->u_regs[UREG_I0] = signo;
719 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
720
721 regs->pc = (unsigned long) ka->sa.sa_handler;
722 regs->npc = (regs->pc + 4);
723
724 if(ka->ka_restorer)
725 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
726 else {
727 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
728
729 /* mov __NR_sigreturn, %g1 */
730 err |= __put_user(0x821020d8, &sf->insns[0]);
731
732 /* t 0x10 */
733 err |= __put_user(0x91d02010, &sf->insns[1]);
734 if (err)
735 goto sigsegv;
736
737 /* Flush instruction space. */
738 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
739 }
740 return;
741
742 sigill:
743 do_exit(SIGILL);
744 sigsegv:
745 do_exit(SIGSEGV);
746 }
747
748 /* Setup a Solaris stack frame */
749 static inline void
750 setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
751 struct pt_regs *regs, int signr, sigset_t *oldset)
752 {
753 svr4_signal_frame_t *sfp;
754 svr4_gregset_t *gr;
755 svr4_siginfo_t *si;
756 svr4_mcontext_t *mc;
757 svr4_gwindows_t *gw;
758 svr4_ucontext_t *uc;
759 svr4_sigset_t setv;
760 int window = 0, err;
761
762 synchronize_user_stack();
763 sfp = (svr4_signal_frame_t *) get_sigframe(sa, regs, SVR4_SF_ALIGNED + REGWIN_SZ);
764
765 if (invalid_frame_pointer (sfp, sizeof (*sfp))){
766 #ifdef DEBUG_SIGNALS
767 printk ("Invalid stack frame\n");
768 #endif
769 goto sigill_and_return;
770 }
771
772 /* Start with a clean frame pointer and fill it */
773 err = __clear_user(sfp, sizeof (*sfp));
774
775 /* Setup convenience variables */
776 si = &sfp->si;
777 uc = &sfp->uc;
778 gw = &sfp->gw;
779 mc = &uc->mcontext;
780 gr = &mc->greg;
781
782 /* FIXME: where am I supposed to put this?
783 * sc->sigc_onstack = old_status;
784 * anyways, it does not look like it is used for anything at all.
785 */
786 setv.sigbits[0] = oldset->sig[0];
787 setv.sigbits[1] = oldset->sig[1];
788 if (_NSIG_WORDS >= 4) {
789 setv.sigbits[2] = oldset->sig[2];
790 setv.sigbits[3] = oldset->sig[3];
791 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
792 } else
793 err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int));
794
795 /* Store registers */
796 err |= __put_user(regs->pc, &((*gr) [SVR4_PC]));
797 err |= __put_user(regs->npc, &((*gr) [SVR4_NPC]));
798 err |= __put_user(regs->psr, &((*gr) [SVR4_PSR]));
799 err |= __put_user(regs->y, &((*gr) [SVR4_Y]));
800
801 /* Copy g [1..7] and o [0..7] registers */
802 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs [UREG_G1], sizeof (long) * 7);
803 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs [UREG_I0], sizeof (long) * 8);
804
805 /* Setup sigaltstack */
806 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
807 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
808 err |= __put_user(current->sas_ss_size, &uc->stack.size);
809
810 /* Save the currently window file: */
811
812 /* 1. Link sfp->uc->gwins to our windows */
813 err |= __put_user(gw, &mc->gwin);
814
815 /* 2. Number of windows to restore at setcontext (): */
816 err |= __put_user(current->thread.w_saved, &gw->count);
817
818 /* 3. Save each valid window
819 * Currently, it makes a copy of the windows from the kernel copy.
820 * David's code for SunOS, makes the copy but keeps the pointer to
821 * the kernel. My version makes the pointer point to a userland
822 * copy of those. Mhm, I wonder if I shouldn't just ignore those
823 * on setcontext and use those that are on the kernel, the signal
824 * handler should not be modyfing those, mhm.
825 *
826 * These windows are just used in case synchronize_user_stack failed
827 * to flush the user windows.
828 */
829 for(window = 0; window < current->thread.w_saved; window++) {
830 err |= __put_user((int *) &(gw->win [window]), &gw->winptr [window]);
831 err |= __copy_to_user(&gw->win [window],
832 &current->thread.reg_window [window],
833 sizeof (svr4_rwindow_t));
834 err |= __put_user(0, gw->winptr [window]);
835 }
836
837 /* 4. We just pay attention to the gw->count field on setcontext */
838 current->thread.w_saved = 0; /* So process is allowed to execute. */
839
840 /* Setup the signal information. Solaris expects a bunch of
841 * information to be passed to the signal handler, we don't provide
842 * that much currently, should use siginfo.
843 */
844 err |= __put_user(signr, &si->siginfo.signo);
845 err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
846 if (err)
847 goto sigsegv;
848
849 regs->u_regs[UREG_FP] = (unsigned long) sfp;
850 regs->pc = (unsigned long) sa->sa_handler;
851 regs->npc = (regs->pc + 4);
852
853 #ifdef DEBUG_SIGNALS
854 printk ("Solaris-frame: %x %x\n", (int) regs->pc, (int) regs->npc);
855 #endif
856 /* Arguments passed to signal handler */
857 if (regs->u_regs [14]){
858 struct reg_window *rw = (struct reg_window *) regs->u_regs [14];
859
860 err |= __put_user(signr, &rw->ins [0]);
861 err |= __put_user(si, &rw->ins [1]);
862 err |= __put_user(uc, &rw->ins [2]);
863 err |= __put_user(sfp, &rw->ins [6]); /* frame pointer */
864 if (err)
865 goto sigsegv;
866
867 regs->u_regs[UREG_I0] = signr;
868 regs->u_regs[UREG_I1] = (uint) si;
869 regs->u_regs[UREG_I2] = (uint) uc;
870 }
871 return;
872
873 sigill_and_return:
874 do_exit(SIGILL);
875 sigsegv:
876 do_exit(SIGSEGV);
877 }
878
879 asmlinkage int svr4_getcontext (svr4_ucontext_t *uc, struct pt_regs *regs)
880 {
881 svr4_gregset_t *gr;
882 svr4_mcontext_t *mc;
883 svr4_sigset_t setv;
884 int err = 0;
885
886 synchronize_user_stack();
887
888 if (current->thread.w_saved)
889 goto sigsegv_and_return;
890
891 err = clear_user(uc, sizeof (*uc));
892 if (err)
893 return -EFAULT;
894
895 /* Setup convenience variables */
896 mc = &uc->mcontext;
897 gr = &mc->greg;
898
899 setv.sigbits[0] = current->blocked.sig[0];
900 setv.sigbits[1] = current->blocked.sig[1];
901 if (_NSIG_WORDS >= 4) {
902 setv.sigbits[2] = current->blocked.sig[2];
903 setv.sigbits[3] = current->blocked.sig[3];
904 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
905 } else
906 err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int));
907
908 /* Store registers */
909 err |= __put_user(regs->pc, &uc->mcontext.greg [SVR4_PC]);
910 err |= __put_user(regs->npc, &uc->mcontext.greg [SVR4_NPC]);
911 err |= __put_user(regs->psr, &uc->mcontext.greg [SVR4_PSR]);
912 err |= __put_user(regs->y, &uc->mcontext.greg [SVR4_Y]);
913
914 /* Copy g [1..7] and o [0..7] registers */
915 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs [UREG_G1], sizeof (uint) * 7);
916 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs [UREG_I0], sizeof (uint) * 8);
917
918 /* Setup sigaltstack */
919 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
920 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
921 err |= __put_user(current->sas_ss_size, &uc->stack.size);
922
923 /* The register file is not saved
924 * we have already stuffed all of it with sync_user_stack
925 */
926 return (err ? -EFAULT : 0);
927
928 sigsegv_and_return:
929 do_exit(SIGSEGV);
930 }
931
932 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
933 asmlinkage int svr4_setcontext (svr4_ucontext_t *c, struct pt_regs *regs)
934 {
935 struct thread_struct *tp = &current->thread;
936 svr4_gregset_t *gr;
937 unsigned long pc, npc, psr;
938 sigset_t set;
939 svr4_sigset_t setv;
940 int err;
941 stack_t st;
942
943 /* Fixme: restore windows, or is this already taken care of in
944 * svr4_setup_frame when sync_user_windows is done?
945 */
946 flush_user_windows();
947
948 if (tp->w_saved)
949 goto sigsegv_and_return;
950
951 if (((uint) c) & 3)
952 goto sigsegv_and_return;
953
954 if(!__access_ok((unsigned long)c, sizeof(*c)))
955 goto sigsegv_and_return;
956
957 /* Check for valid PC and nPC */
958 gr = &c->mcontext.greg;
959 err = __get_user(pc, &((*gr)[SVR4_PC]));
960 err |= __get_user(npc, &((*gr)[SVR4_NPC]));
961
962 if((pc | npc) & 3)
963 goto sigsegv_and_return;
964
965 /* Retrieve information from passed ucontext */
966 /* note that nPC is ored a 1, this is used to inform entry.S */
967 /* that we don't want it to mess with our PC and nPC */
968
969 /* This is pretty much atomic, no amount locking would prevent
970 * the races which exist anyways.
971 */
972 err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
973
974 err |= __get_user(st.ss_sp, &c->stack.sp);
975 err |= __get_user(st.ss_flags, &c->stack.flags);
976 err |= __get_user(st.ss_size, &c->stack.size);
977
978 if (err)
979 goto sigsegv_and_return;
980
981 /* It is more difficult to avoid calling this function than to
982 call it and ignore errors. */
983 do_sigaltstack(&st, NULL, regs->u_regs[UREG_I6]);
984
985 set.sig[0] = setv.sigbits[0];
986 set.sig[1] = setv.sigbits[1];
987 if (_NSIG_WORDS >= 4) {
988 set.sig[2] = setv.sigbits[2];
989 set.sig[3] = setv.sigbits[3];
990 }
991 sigdelsetmask(&set, ~_BLOCKABLE);
992 spin_lock_irq(&current->sigmask_lock);
993 current->blocked = set;
994 recalc_sigpending(current);
995 spin_unlock_irq(&current->sigmask_lock);
996 regs->pc = pc;
997 regs->npc = npc | 1;
998 err |= __get_user(regs->y, &((*gr) [SVR4_Y]));
999 err |= __get_user(psr, &((*gr) [SVR4_PSR]));
1000 regs->psr &= ~(PSR_ICC);
1001 regs->psr |= (psr & PSR_ICC);
1002
1003 /* Restore g[1..7] and o[0..7] registers */
1004 err |= __copy_from_user(&regs->u_regs [UREG_G1], &(*gr)[SVR4_G1],
1005 sizeof (long) * 7);
1006 err |= __copy_from_user(&regs->u_regs [UREG_I0], &(*gr)[SVR4_O0],
1007 sizeof (long) * 8);
1008 return (err ? -EFAULT : 0);
1009
1010 sigsegv_and_return:
1011 do_exit(SIGSEGV);
1012 }
1013
1014 static inline void
1015 handle_signal(unsigned long signr, struct k_sigaction *ka,
1016 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
1017 int svr4_signal)
1018 {
1019 if (svr4_signal)
1020 setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
1021 else {
1022 if (ka->sa.sa_flags & SA_SIGINFO)
1023 new_setup_rt_frame(ka, regs, signr, oldset, info);
1024 else if (current->thread.new_signal)
1025 new_setup_frame (ka, regs, signr, oldset);
1026 else
1027 setup_frame(&ka->sa, regs, signr, oldset, info);
1028 }
1029 if(ka->sa.sa_flags & SA_ONESHOT)
1030 ka->sa.sa_handler = SIG_DFL;
1031 if(!(ka->sa.sa_flags & SA_NOMASK)) {
1032 spin_lock_irq(&current->sigmask_lock);
1033 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
1034 sigaddset(&current->blocked, signr);
1035 recalc_sigpending(current);
1036 spin_unlock_irq(&current->sigmask_lock);
1037 }
1038 }
1039
1040 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
1041 struct sigaction *sa)
1042 {
1043 switch(regs->u_regs[UREG_I0]) {
1044 case ERESTARTNOHAND:
1045 no_system_call_restart:
1046 regs->u_regs[UREG_I0] = EINTR;
1047 regs->psr |= PSR_C;
1048 break;
1049 case ERESTARTSYS:
1050 if(!(sa->sa_flags & SA_RESTART))
1051 goto no_system_call_restart;
1052 /* fallthrough */
1053 case ERESTARTNOINTR:
1054 regs->u_regs[UREG_I0] = orig_i0;
1055 regs->pc -= 4;
1056 regs->npc -= 4;
1057 }
1058 }
1059
1060 #ifdef DEBUG_SIGNALS_MAPS
1061
1062 #define MAPS_LINE_FORMAT "%08lx-%08lx %s %08lx %s %lu "
1063
1064 static inline void read_maps (void)
1065 {
1066 struct vm_area_struct * map, * next;
1067 char * buffer;
1068 ssize_t i;
1069
1070 buffer = (char*)__get_free_page(GFP_KERNEL);
1071 if (!buffer)
1072 return;
1073
1074 for (map = current->mm->mmap ; map ; map = next ) {
1075 /* produce the next line */
1076 char *line;
1077 char str[5], *cp = str;
1078 int flags;
1079 kdev_t dev;
1080 unsigned long ino;
1081
1082 /*
1083 * Get the next vma now (but it won't be used if we sleep).
1084 */
1085 next = map->vm_next;
1086 flags = map->vm_flags;
1087
1088 *cp++ = flags & VM_READ ? 'r' : '-';
1089 *cp++ = flags & VM_WRITE ? 'w' : '-';
1090 *cp++ = flags & VM_EXEC ? 'x' : '-';
1091 *cp++ = flags & VM_MAYSHARE ? 's' : 'p';
1092 *cp++ = 0;
1093
1094 dev = 0;
1095 ino = 0;
1096 if (map->vm_file != NULL) {
1097 dev = map->vm_file->f_dentry->d_inode->i_dev;
1098 ino = map->vm_file->f_dentry->d_inode->i_ino;
1099 line = d_path(map->vm_file->f_dentry, buffer, PAGE_SIZE);
1100 }
1101 printk(MAPS_LINE_FORMAT, map->vm_start, map->vm_end, str, map->vm_pgoff << PAGE_SHIFT,
1102 kdevname(dev), ino);
1103 if (map->vm_file != NULL)
1104 printk("%s\n", line);
1105 else
1106 printk("\n");
1107 }
1108 free_page((unsigned long)buffer);
1109 return;
1110 }
1111 #endif
1112
1113 /* Note that 'init' is a special process: it doesn't get signals it doesn't
1114 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1115 * mistake.
1116 */
1117 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
1118 unsigned long orig_i0, int restart_syscall)
1119 {
1120 unsigned long signr;
1121 struct k_sigaction *ka;
1122 siginfo_t info;
1123
1124 /*
1125 * XXX Disable svr4 signal handling until solaris emulation works.
1126 * It is buggy - Anton
1127 */
1128 #define SVR4_SIGNAL_BROKEN 1
1129 #ifdef SVR4_SIGNAL_BROKEN
1130 int svr4_signal = 0;
1131 #else
1132 int svr4_signal = current->personality == PER_SVR4;
1133 #endif
1134
1135 if (!oldset)
1136 oldset = &current->blocked;
1137
1138 for (;;) {
1139 spin_lock_irq(&current->sigmask_lock);
1140 signr = dequeue_signal(&current->blocked, &info);
1141 spin_unlock_irq(&current->sigmask_lock);
1142
1143 if (!signr) break;
1144
1145 if ((current->flags & PF_PTRACED) && signr != SIGKILL) {
1146 current->exit_code = signr;
1147 current->state = TASK_STOPPED;
1148
1149 /* This happens to be SMP safe so no need to
1150 * grab master kernel lock even in this case.
1151 */
1152 notify_parent(current, SIGCHLD);
1153 schedule();
1154 if (!(signr = current->exit_code))
1155 continue;
1156 current->exit_code = 0;
1157 if (signr == SIGSTOP)
1158 continue;
1159
1160 /* Update the siginfo structure. Is this good? */
1161 if (signr != info.si_signo) {
1162 info.si_signo = signr;
1163 info.si_errno = 0;
1164 info.si_code = SI_USER;
1165 info.si_pid = current->p_pptr->pid;
1166 info.si_uid = current->p_pptr->uid;
1167 }
1168
1169 /* If the (new) signal is now blocked, requeue it. */
1170 if (sigismember(&current->blocked, signr)) {
1171 send_sig_info(signr, &info, current);
1172 continue;
1173 }
1174 }
1175
1176 ka = &current->sig->action[signr-1];
1177
1178 if(ka->sa.sa_handler == SIG_IGN) {
1179 if(signr != SIGCHLD)
1180 continue;
1181
1182 /* sys_wait4() grabs the master kernel lock, so
1183 * we need not do so, that sucker should be
1184 * threaded and would not be that difficult to
1185 * do anyways.
1186 */
1187 while(sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
1188 ;
1189 continue;
1190 }
1191 if(ka->sa.sa_handler == SIG_DFL) {
1192 unsigned long exit_code = signr;
1193
1194 if(current->pid == 1)
1195 continue;
1196 switch(signr) {
1197 case SIGCONT: case SIGCHLD: case SIGWINCH:
1198 continue;
1199
1200 case SIGTSTP: case SIGTTIN: case SIGTTOU:
1201 /* The operations performed by
1202 * is_orphaned_pgrp() are protected by
1203 * the tasklist_lock.
1204 */
1205 if (is_orphaned_pgrp(current->pgrp))
1206 continue;
1207
1208 case SIGSTOP:
1209 if (current->flags & PF_PTRACED)
1210 continue;
1211 current->state = TASK_STOPPED;
1212 current->exit_code = signr;
1213
1214 /* notify_parent() is SMP safe */
1215 if(!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags &
1216 SA_NOCLDSTOP))
1217 notify_parent(current, SIGCHLD);
1218 schedule();
1219 continue;
1220
1221 case SIGQUIT: case SIGILL: case SIGTRAP:
1222 case SIGABRT: case SIGFPE: case SIGSEGV:
1223 case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
1224 if (do_coredump(signr, regs))
1225 exit_code |= 0x80;
1226 #ifdef DEBUG_SIGNALS
1227 /* Very useful to debug dynamic linker problems */
1228 printk ("Sig %ld going for %s[%d]...\n", signr, current->comm, current->pid);
1229 show_regs (regs);
1230 #ifdef DEBUG_SIGNALS_TRACE
1231 {
1232 struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP];
1233 unsigned int ins[8];
1234
1235 while(rw &&
1236 !(((unsigned long) rw) & 0x3)) {
1237 copy_from_user(ins, &rw->ins[0], sizeof(ins));
1238 printk("Caller[%08x](%08x,%08x,%08x,%08x,%08x,%08x)\n", ins[7], ins[0], ins[1], ins[2], ins[3], ins[4], ins[5]);
1239 rw = (struct reg_window *)(unsigned long)ins[6];
1240 }
1241 }
1242 #endif
1243 #ifdef DEBUG_SIGNALS_MAPS
1244 printk("Maps:\n");
1245 read_maps();
1246 #endif
1247 #endif
1248 /* fall through */
1249 default:
1250 lock_kernel();
1251 sigaddset(&current->signal, signr);
1252 recalc_sigpending(current);
1253 current->flags |= PF_SIGNALED;
1254 do_exit(exit_code);
1255 /* NOT REACHED */
1256 }
1257 }
1258 if(restart_syscall)
1259 syscall_restart(orig_i0, regs, &ka->sa);
1260 handle_signal(signr, ka, &info, oldset, regs, svr4_signal);
1261 return 1;
1262 }
1263 if(restart_syscall &&
1264 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1265 regs->u_regs[UREG_I0] == ERESTARTSYS ||
1266 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1267 /* replay the system call when we are done */
1268 regs->u_regs[UREG_I0] = orig_i0;
1269 regs->pc -= 4;
1270 regs->npc -= 4;
1271 }
1272 return 0;
1273 }
1274
1275 asmlinkage int
1276 do_sys_sigstack(struct sigstack *ssptr, struct sigstack *ossptr, unsigned long sp)
1277 {
1278 int ret = -EFAULT;
1279
1280 /* First see if old state is wanted. */
1281 if (ossptr) {
1282 if (put_user(current->sas_ss_sp + current->sas_ss_size, &ossptr->the_stack) ||
1283 __put_user(on_sig_stack(sp), &ossptr->cur_status))
1284 goto out;
1285 }
1286
1287 /* Now see if we want to update the new state. */
1288 if (ssptr) {
1289 void *ss_sp;
1290
1291 if (get_user((long)ss_sp, &ssptr->the_stack))
1292 goto out;
1293 /* If the current stack was set with sigaltstack, don't
1294 swap stacks while we are on it. */
1295 ret = -EPERM;
1296 if (current->sas_ss_sp && on_sig_stack(sp))
1297 goto out;
1298
1299 /* Since we don't know the extent of the stack, and we don't
1300 track onstack-ness, but rather calculate it, we must
1301 presume a size. Ho hum this interface is lossy. */
1302 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
1303 current->sas_ss_size = SIGSTKSZ;
1304 }
1305 ret = 0;
1306 out:
1307 return ret;
1308 }
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