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Import 2.3.18pre1
[davej-history.git] / arch / sparc / kernel / signal.c
bloba6f21c57cbc29ca9da7e9c1014deca503261c731
1 /* $Id: signal.c,v 1.95 1999/08/14 03:51:22 anton 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/pgtable.h>
26
27 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
28
29 asmlinkage int sys_wait4(pid_t pid, unsigned long *stat_addr,
30 int options, unsigned long *ru);
31
32 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
33 void *fpqueue, unsigned long *fpqdepth);
34 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
35
36 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
37 unsigned long orig_o0, int ret_from_syscall);
38
39 /* This turned off for production... */
40 /* #define DEBUG_SIGNALS 1 */
41 /* #define DEBUG_SIGNALS_TRACE 1 */
42 /* #define DEBUG_SIGNALS_MAPS 1 */
43
44 /* Signal frames: the original one (compatible with SunOS):
45 *
46 * Set up a signal frame... Make the stack look the way SunOS
47 * expects it to look which is basically:
48 *
49 * ---------------------------------- <-- %sp at signal time
50 * Struct sigcontext
51 * Signal address
52 * Ptr to sigcontext area above
53 * Signal code
54 * The signal number itself
55 * One register window
56 * ---------------------------------- <-- New %sp
57 */
58 struct signal_sframe {
59 struct reg_window sig_window;
60 int sig_num;
61 int sig_code;
62 struct sigcontext *sig_scptr;
63 int sig_address;
64 struct sigcontext sig_context;
65 unsigned int extramask[_NSIG_WORDS - 1];
66 };
67
68 /*
69 * And the new one, intended to be used for Linux applications only
70 * (we have enough in there to work with clone).
71 * All the interesting bits are in the info field.
72 */
73
74 struct new_signal_frame {
75 struct sparc_stackf ss;
76 __siginfo_t info;
77 __siginfo_fpu_t *fpu_save;
78 unsigned long insns [2] __attribute__ ((aligned (8)));
79 unsigned int extramask[_NSIG_WORDS - 1];
80 unsigned int extra_size; /* Should be 0 */
81 __siginfo_fpu_t fpu_state;
82 };
83
84 struct rt_signal_frame {
85 struct sparc_stackf ss;
86 siginfo_t info;
87 struct pt_regs regs;
88 sigset_t mask;
89 __siginfo_fpu_t *fpu_save;
90 unsigned int insns [2];
91 stack_t stack;
92 unsigned int extra_size; /* Should be 0 */
93 __siginfo_fpu_t fpu_state;
94 };
95
96 /* Align macros */
97 #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7)))
98 #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7)))
99 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
100
101 /*
102 * atomically swap in the new signal mask, and wait for a signal.
103 * This is really tricky on the Sparc, watch out...
104 */
105 asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
106 {
107 sigset_t saveset;
108
109 set &= _BLOCKABLE;
110 spin_lock_irq(&current->sigmask_lock);
111 saveset = current->blocked;
112 siginitset(&current->blocked, set);
113 recalc_sigpending(current);
114 spin_unlock_irq(&current->sigmask_lock);
115
116 regs->pc = regs->npc;
117 regs->npc += 4;
118
119 /* Condition codes and return value where set here for sigpause,
120 * and so got used by setup_frame, which again causes sigreturn()
121 * to return -EINTR.
122 */
123 while (1) {
124 current->state = TASK_INTERRUPTIBLE;
125 schedule();
126 /*
127 * Return -EINTR and set condition code here,
128 * so the interrupted system call actually returns
129 * these.
130 */
131 regs->psr |= PSR_C;
132 regs->u_regs[UREG_I0] = EINTR;
133 if (do_signal(&saveset, regs, 0, 0))
134 return;
135 }
136 }
137
138 asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
139 {
140 _sigpause_common(set, regs);
141 }
142
143 asmlinkage void do_sigsuspend (struct pt_regs *regs)
144 {
145 _sigpause_common(regs->u_regs[UREG_I0], regs);
146 }
147
148 asmlinkage void do_rt_sigsuspend(sigset_t *uset, size_t sigsetsize,
149 struct pt_regs *regs)
150 {
151 sigset_t oldset, set;
152
153 /* XXX: Don't preclude handling different sized sigset_t's. */
154 if (sigsetsize != sizeof(sigset_t)) {
155 regs->psr |= PSR_C;
156 regs->u_regs[UREG_I0] = EINVAL;
157 return;
158 }
159
160 if (copy_from_user(&set, uset, sizeof(set))) {
161 regs->psr |= PSR_C;
162 regs->u_regs[UREG_I0] = EFAULT;
163 return;
164 }
165
166 sigdelsetmask(&set, ~_BLOCKABLE);
167 spin_lock_irq(&current->sigmask_lock);
168 oldset = current->blocked;
169 current->blocked = set;
170 recalc_sigpending(current);
171 spin_unlock_irq(&current->sigmask_lock);
172
173 regs->pc = regs->npc;
174 regs->npc += 4;
175
176 /* Condition codes and return value where set here for sigpause,
177 * and so got used by setup_frame, which again causes sigreturn()
178 * to return -EINTR.
179 */
180 while (1) {
181 current->state = TASK_INTERRUPTIBLE;
182 schedule();
183 /*
184 * Return -EINTR and set condition code here,
185 * so the interrupted system call actually returns
186 * these.
187 */
188 regs->psr |= PSR_C;
189 regs->u_regs[UREG_I0] = EINTR;
190 if (do_signal(&oldset, regs, 0, 0))
191 return;
192 }
193 }
194
195 static inline int
196 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu)
197 {
198 int err;
199 #ifdef __SMP__
200 if (current->flags & PF_USEDFPU)
201 regs->psr &= ~PSR_EF;
202 #else
203 if (current == last_task_used_math) {
204 last_task_used_math = 0;
205 regs->psr &= ~PSR_EF;
206 }
207 #endif
208 current->used_math = 1;
209 current->flags &= ~PF_USEDFPU;
210
211 if (verify_area (VERIFY_READ, fpu, sizeof(*fpu)))
212 return -EFAULT;
213
214 err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
215 (sizeof(unsigned long) * 32));
216 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
217 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
218 if (current->thread.fpqdepth != 0)
219 err |= __copy_from_user(&current->thread.fpqueue[0],
220 &fpu->si_fpqueue[0],
221 ((sizeof(unsigned long) +
222 (sizeof(unsigned long *)))*16));
223 return err;
224 }
225
226 static inline void do_new_sigreturn (struct pt_regs *regs)
227 {
228 struct new_signal_frame *sf;
229 unsigned long up_psr, pc, npc;
230 sigset_t set;
231 __siginfo_fpu_t *fpu_save;
232 int err;
233
234 sf = (struct new_signal_frame *) regs->u_regs [UREG_FP];
235
236 /* 1. Make sure we are not getting garbage from the user */
237 if (verify_area (VERIFY_READ, sf, sizeof (*sf)))
238 goto segv_and_exit;
239
240 if (((uint) sf) & 3)
241 goto segv_and_exit;
242
243 err = __get_user(pc, &sf->info.si_regs.pc);
244 err |= __get_user(npc, &sf->info.si_regs.npc);
245
246 if ((pc | npc) & 3)
247 goto segv_and_exit;
248
249 /* 2. Restore the state */
250 up_psr = regs->psr;
251 err |= __copy_from_user(regs, &sf->info.si_regs, sizeof (struct pt_regs));
252
253 /* User can only change condition codes and FPU enabling in %psr. */
254 regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
255 | (regs->psr & (PSR_ICC | PSR_EF));
256
257 err |= __get_user(fpu_save, &sf->fpu_save);
258
259 if (fpu_save)
260 err |= restore_fpu_state(regs, fpu_save);
261
262 /* This is pretty much atomic, no amount locking would prevent
263 * the races which exist anyways.
264 */
265 err |= __get_user(set.sig[0], &sf->info.si_mask);
266 err |= __copy_from_user(&set.sig[1], &sf->extramask,
267 (_NSIG_WORDS-1) * sizeof(unsigned int));
268
269 if (err)
270 goto segv_and_exit;
271
272 sigdelsetmask(&set, ~_BLOCKABLE);
273 spin_lock_irq(&current->sigmask_lock);
274 current->blocked = set;
275 recalc_sigpending(current);
276 spin_unlock_irq(&current->sigmask_lock);
277 return;
278
279 segv_and_exit:
280 do_exit(SIGSEGV);
281 }
282
283 asmlinkage void do_sigreturn(struct pt_regs *regs)
284 {
285 struct sigcontext *scptr;
286 unsigned long pc, npc, psr;
287 sigset_t set;
288 int err;
289
290 synchronize_user_stack();
291
292 if (current->thread.new_signal)
293 return do_new_sigreturn (regs);
294
295 scptr = (struct sigcontext *) regs->u_regs[UREG_I0];
296
297 /* Check sanity of the user arg. */
298 if(verify_area(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
299 (((unsigned long) scptr) & 3))
300 goto segv_and_exit;
301
302 err = __get_user(pc, &scptr->sigc_pc);
303 err |= __get_user(npc, &scptr->sigc_npc);
304
305 if((pc | npc) & 3)
306 goto segv_and_exit;
307
308 /* This is pretty much atomic, no amount locking would prevent
309 * the races which exist anyways.
310 */
311 err |= __get_user(set.sig[0], &scptr->sigc_mask);
312 /* Note that scptr + 1 points to extramask */
313 err |= __copy_from_user(&set.sig[1], scptr + 1,
314 (_NSIG_WORDS - 1) * sizeof(unsigned int));
315
316 if (err)
317 goto segv_and_exit;
318
319 sigdelsetmask(&set, ~_BLOCKABLE);
320 spin_lock_irq(&current->sigmask_lock);
321 current->blocked = set;
322 recalc_sigpending(current);
323 spin_unlock_irq(&current->sigmask_lock);
324
325 regs->pc = pc;
326 regs->npc = npc;
327
328 err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
329 err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
330 err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
331
332 /* User can only change condition codes in %psr. */
333 err |= __get_user(psr, &scptr->sigc_psr);
334 if (err)
335 goto segv_and_exit;
336
337 regs->psr &= ~(PSR_ICC);
338 regs->psr |= (psr & PSR_ICC);
339 return;
340
341 segv_and_exit:
342 send_sig(SIGSEGV, current, 1);
343 }
344
345 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
346 {
347 struct rt_signal_frame *sf;
348 unsigned int psr, pc, npc;
349 __siginfo_fpu_t *fpu_save;
350 sigset_t set;
351 stack_t st;
352 int err;
353
354 synchronize_user_stack();
355 sf = (struct rt_signal_frame *) regs->u_regs[UREG_FP];
356 if(verify_area(VERIFY_READ, sf, sizeof(*sf)) ||
357 (((unsigned long) sf) & 0x03))
358 goto segv;
359
360 err = __get_user(pc, &sf->regs.pc);
361 err |= __get_user(npc, &sf->regs.npc);
362 err |= ((pc | npc) & 0x03);
363
364 err |= __get_user(regs->y, &sf->regs.y);
365 err |= __get_user(psr, &sf->regs.psr);
366
367 err |= __copy_from_user(&regs->u_regs[UREG_G1], &sf->regs.u_regs[UREG_G1], 15*sizeof(u32));
368
369 regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
370
371 err |= __get_user(fpu_save, &sf->fpu_save);
372
373 if(fpu_save)
374 err |= restore_fpu_state(regs, fpu_save);
375 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
376
377 err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
378
379 if (err)
380 goto segv;
381
382 regs->pc = pc;
383 regs->npc = npc;
384
385 /* It is more difficult to avoid calling this function than to
386 call it and ignore errors. */
387 do_sigaltstack(&st, NULL, (unsigned long)sf);
388
389 sigdelsetmask(&set, ~_BLOCKABLE);
390 spin_lock_irq(&current->sigmask_lock);
391 current->blocked = set;
392 recalc_sigpending(current);
393 spin_unlock_irq(&current->sigmask_lock);
394 return;
395 segv:
396 send_sig(SIGSEGV, current, 1);
397 }
398
399 /* Checks if the fp is valid */
400 static inline int invalid_frame_pointer (void *fp, int fplen)
401 {
402 if ((((unsigned long) fp) & 7) ||
403 !__access_ok((unsigned long)fp, fplen) ||
404 ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
405 ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
406 return 1;
407
408 return 0;
409 }
410
411 static inline void *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
412 {
413 unsigned long sp;
414
415 sp = regs->u_regs[UREG_FP];
416
417 /* This is the X/Open sanctioned signal stack switching. */
418 if (sa->sa_flags & SA_ONSTACK) {
419 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
420 sp = current->sas_ss_sp + current->sas_ss_size;
421 }
422 return (void *)(sp - framesize);
423 }
424
425 static inline void
426 setup_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
427 struct pt_regs *regs, int signr, sigset_t *oldset)
428 {
429 struct signal_sframe *sframep;
430 struct sigcontext *sc;
431 int window = 0, err;
432
433 synchronize_user_stack();
434 sframep = (struct signal_sframe *)get_sigframe(sa, regs, SF_ALIGNEDSZ);
435 if (invalid_frame_pointer (sframep, sizeof(*sframep))){
436 #ifdef DEBUG_SIGNALS /* fills up the console logs during crashme runs, yuck... */
437 printk("%s [%d]: User has trashed signal stack\n",
438 current->comm, current->pid);
439 printk("Sigstack ptr %p handler at pc<%08lx> for sig<%d>\n",
440 sframep, pc, signr);
441 #endif
442 /* Don't change signal code and address, so that
443 * post mortem debuggers can have a look.
444 */
445 goto sigill_and_return;
446 }
447
448 sc = &sframep->sig_context;
449
450 /* We've already made sure frame pointer isn't in kernel space... */
451 err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
452 &sc->sigc_onstack);
453 err |= __put_user(oldset->sig[0], &sc->sigc_mask);
454 err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
455 (_NSIG_WORDS - 1) * sizeof(unsigned int));
456 err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
457 err |= __put_user(pc, &sc->sigc_pc);
458 err |= __put_user(npc, &sc->sigc_npc);
459 err |= __put_user(regs->psr, &sc->sigc_psr);
460 err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
461 err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
462 err |= __put_user(current->thread.w_saved, &sc->sigc_oswins);
463 if(current->thread.w_saved)
464 for(window = 0; window < current->thread.w_saved; window++) {
465 sc->sigc_spbuf[window] =
466 (char *)current->thread.rwbuf_stkptrs[window];
467 err |= __copy_to_user(&sc->sigc_wbuf[window],
468 &current->thread.reg_window[window],
469 sizeof(struct reg_window));
470 }
471 else
472 err |= __copy_to_user(sframep, (char *)regs->u_regs[UREG_FP],
473 sizeof(struct reg_window));
474
475 current->thread.w_saved = 0; /* So process is allowed to execute. */
476 err |= __put_user(signr, &sframep->sig_num);
477 if(signr == SIGSEGV ||
478 signr == SIGILL ||
479 signr == SIGFPE ||
480 signr == SIGBUS ||
481 signr == SIGEMT) {
482 err |= __put_user(current->thread.sig_desc, &sframep->sig_code);
483 err |= __put_user(current->thread.sig_address, &sframep->sig_address);
484 } else {
485 err |= __put_user(0, &sframep->sig_code);
486 err |= __put_user(0, &sframep->sig_address);
487 }
488 err |= __put_user(sc, &sframep->sig_scptr);
489 if (err)
490 goto sigsegv;
491
492 regs->u_regs[UREG_FP] = (unsigned long) sframep;
493 regs->pc = (unsigned long) sa->sa_handler;
494 regs->npc = (regs->pc + 4);
495 return;
496
497 sigill_and_return:
498 do_exit(SIGILL);
499 sigsegv:
500 do_exit(SIGSEGV);
501 }
502
503
504 static inline int
505 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t *fpu)
506 {
507 int err = 0;
508 #ifdef __SMP__
509 if (current->flags & PF_USEDFPU) {
510 put_psr(get_psr() | PSR_EF);
511 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
512 &current->thread.fpqueue[0], &current->thread.fpqdepth);
513 regs->psr &= ~(PSR_EF);
514 current->flags &= ~(PF_USEDFPU);
515 }
516 #else
517 if (current == last_task_used_math) {
518 put_psr(get_psr() | PSR_EF);
519 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
520 &current->thread.fpqueue[0], &current->thread.fpqdepth);
521 last_task_used_math = 0;
522 regs->psr &= ~(PSR_EF);
523 }
524 #endif
525 err |= __copy_to_user(&fpu->si_float_regs[0], &current->thread.float_regs[0],
526 (sizeof(unsigned long) * 32));
527 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
528 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
529 if (current->thread.fpqdepth != 0)
530 err |= __copy_to_user(&fpu->si_fpqueue[0], &current->thread.fpqueue[0],
531 ((sizeof(unsigned long) +
532 (sizeof(unsigned long *)))*16));
533 current->used_math = 0;
534 return err;
535 }
536
537 static inline void
538 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
539 int signo, sigset_t *oldset)
540 {
541 struct new_signal_frame *sf;
542 int sigframe_size, err;
543
544 /* 1. Make sure everything is clean */
545 synchronize_user_stack();
546
547 sigframe_size = NF_ALIGNEDSZ;
548 if (!current->used_math)
549 sigframe_size -= sizeof(__siginfo_fpu_t);
550
551 sf = (struct new_signal_frame *)get_sigframe(&ka->sa, regs, sigframe_size);
552
553 if (invalid_frame_pointer (sf, sigframe_size))
554 goto sigill_and_return;
555
556 if (current->thread.w_saved != 0) {
557 #ifdef DEBUG_SIGNALS
558 printk ("%s [%d]: Invalid user stack frame for "
559 "signal delivery.\n", current->comm, current->pid);
560 #endif
561 goto sigill_and_return;
562 }
563
564 /* 2. Save the current process state */
565 err = __copy_to_user(&sf->info.si_regs, regs, sizeof (struct pt_regs));
566
567 err |= __put_user(0, &sf->extra_size);
568
569 if (current->used_math) {
570 err |= save_fpu_state(regs, &sf->fpu_state);
571 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
572 } else {
573 err |= __put_user(0, &sf->fpu_save);
574 }
575
576 err |= __put_user(oldset->sig[0], &sf->info.si_mask);
577 err |= __copy_to_user(sf->extramask, &oldset->sig[1],
578 (_NSIG_WORDS - 1) * sizeof(unsigned int));
579 err |= __copy_to_user(sf, (char *) regs->u_regs [UREG_FP],
580 sizeof (struct reg_window));
581 if (err)
582 goto sigsegv;
583
584 /* 3. signal handler back-trampoline and parameters */
585 regs->u_regs[UREG_FP] = (unsigned long) sf;
586 regs->u_regs[UREG_I0] = signo;
587 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
588
589 /* 4. signal handler */
590 regs->pc = (unsigned long) ka->sa.sa_handler;
591 regs->npc = (regs->pc + 4);
592
593 /* 5. return to kernel instructions */
594 if (ka->ka_restorer)
595 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
596 else {
597 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
598
599 /* mov __NR_sigreturn, %g1 */
600 err |= __put_user(0x821020d8, &sf->insns[0]);
601
602 /* t 0x10 */
603 err |= __put_user(0x91d02010, &sf->insns[1]);
604 if (err)
605 goto sigsegv;
606
607 /* Flush instruction space. */
608 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
609 }
610 return;
611
612 sigill_and_return:
613 do_exit(SIGILL);
614 sigsegv:
615 do_exit(SIGSEGV);
616 }
617
618 static inline void
619 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
620 int signo, sigset_t *oldset, siginfo_t *info)
621 {
622 struct rt_signal_frame *sf;
623 int sigframe_size;
624 unsigned int psr;
625 int err;
626
627 synchronize_user_stack();
628 sigframe_size = RT_ALIGNEDSZ;
629 if(!current->used_math)
630 sigframe_size -= sizeof(__siginfo_fpu_t);
631 sf = (struct rt_signal_frame *)get_sigframe(&ka->sa, regs, sigframe_size);
632 if(invalid_frame_pointer(sf, sigframe_size))
633 goto sigill;
634 if(current->thread.w_saved != 0)
635 goto sigill;
636
637 err = __put_user(regs->pc, &sf->regs.pc);
638 err |= __put_user(regs->npc, &sf->regs.npc);
639 err |= __put_user(regs->y, &sf->regs.y);
640 psr = regs->psr;
641 if(current->used_math)
642 psr |= PSR_EF;
643 err |= __put_user(psr, &sf->regs.psr);
644 err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
645 err |= __put_user(0, &sf->extra_size);
646
647 if(psr & PSR_EF) {
648 err |= save_fpu_state(regs, &sf->fpu_state);
649 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
650 } else {
651 err |= __put_user(0, &sf->fpu_save);
652 }
653 err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
654
655 /* Setup sigaltstack */
656 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
657 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
658 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
659
660 err |= __copy_to_user(sf, (char *) regs->u_regs [UREG_FP],
661 sizeof (struct reg_window));
662
663 err |= __copy_to_user(&sf->info, info, sizeof(siginfo_t));
664
665 if (err)
666 goto sigsegv;
667
668 regs->u_regs[UREG_FP] = (unsigned long) sf;
669 regs->u_regs[UREG_I0] = signo;
670 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
671
672 regs->pc = (unsigned long) ka->sa.sa_handler;
673 regs->npc = (regs->pc + 4);
674
675 if(ka->ka_restorer)
676 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
677 else {
678 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
679
680 /* mov __NR_sigreturn, %g1 */
681 err |= __put_user(0x821020d8, &sf->insns[0]);
682
683 /* t 0x10 */
684 err |= __put_user(0x91d02010, &sf->insns[1]);
685 if (err)
686 goto sigsegv;
687
688 /* Flush instruction space. */
689 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
690 }
691 return;
692
693 sigill:
694 do_exit(SIGILL);
695 sigsegv:
696 do_exit(SIGSEGV);
697 }
698
699 /* Setup a Solaris stack frame */
700 static inline void
701 setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
702 struct pt_regs *regs, int signr, sigset_t *oldset)
703 {
704 svr4_signal_frame_t *sfp;
705 svr4_gregset_t *gr;
706 svr4_siginfo_t *si;
707 svr4_mcontext_t *mc;
708 svr4_gwindows_t *gw;
709 svr4_ucontext_t *uc;
710 svr4_sigset_t setv;
711 int window = 0, err;
712
713 synchronize_user_stack();
714 sfp = (svr4_signal_frame_t *) get_sigframe(sa, regs, SVR4_SF_ALIGNED + REGWIN_SZ);
715
716 if (invalid_frame_pointer (sfp, sizeof (*sfp))){
717 #ifdef DEBUG_SIGNALS
718 printk ("Invalid stack frame\n");
719 #endif
720 goto sigill_and_return;
721 }
722
723 /* Start with a clean frame pointer and fill it */
724 err = __clear_user(sfp, sizeof (*sfp));
725
726 /* Setup convenience variables */
727 si = &sfp->si;
728 uc = &sfp->uc;
729 gw = &sfp->gw;
730 mc = &uc->mcontext;
731 gr = &mc->greg;
732
733 /* FIXME: where am I supposed to put this?
734 * sc->sigc_onstack = old_status;
735 * anyways, it does not look like it is used for anything at all.
736 */
737 setv.sigbits[0] = oldset->sig[0];
738 setv.sigbits[1] = oldset->sig[1];
739 if (_NSIG_WORDS >= 4) {
740 setv.sigbits[2] = oldset->sig[2];
741 setv.sigbits[3] = oldset->sig[3];
742 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
743 } else
744 err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int));
745
746 /* Store registers */
747 err |= __put_user(regs->pc, &((*gr) [SVR4_PC]));
748 err |= __put_user(regs->npc, &((*gr) [SVR4_NPC]));
749 err |= __put_user(regs->psr, &((*gr) [SVR4_PSR]));
750 err |= __put_user(regs->y, &((*gr) [SVR4_Y]));
751
752 /* Copy g [1..7] and o [0..7] registers */
753 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs [UREG_G1], sizeof (long) * 7);
754 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs [UREG_I0], sizeof (long) * 8);
755
756 /* Setup sigaltstack */
757 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
758 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
759 err |= __put_user(current->sas_ss_size, &uc->stack.size);
760
761 /* Save the currently window file: */
762
763 /* 1. Link sfp->uc->gwins to our windows */
764 err |= __put_user(gw, &mc->gwin);
765
766 /* 2. Number of windows to restore at setcontext (): */
767 err |= __put_user(current->thread.w_saved, &gw->count);
768
769 /* 3. Save each valid window
770 * Currently, it makes a copy of the windows from the kernel copy.
771 * David's code for SunOS, makes the copy but keeps the pointer to
772 * the kernel. My version makes the pointer point to a userland
773 * copy of those. Mhm, I wonder if I shouldn't just ignore those
774 * on setcontext and use those that are on the kernel, the signal
775 * handler should not be modyfing those, mhm.
776 *
777 * These windows are just used in case synchronize_user_stack failed
778 * to flush the user windows.
779 */
780 for(window = 0; window < current->thread.w_saved; window++) {
781 err |= __put_user((int *) &(gw->win [window]), &gw->winptr [window]);
782 err |= __copy_to_user(&gw->win [window],
783 &current->thread.reg_window [window],
784 sizeof (svr4_rwindow_t));
785 err |= __put_user(0, gw->winptr [window]);
786 }
787
788 /* 4. We just pay attention to the gw->count field on setcontext */
789 current->thread.w_saved = 0; /* So process is allowed to execute. */
790
791 /* Setup the signal information. Solaris expects a bunch of
792 * information to be passed to the signal handler, we don't provide
793 * that much currently, should use those that David already
794 * is providing with thread.sig_desc
795 */
796 err |= __put_user(signr, &si->siginfo.signo);
797 err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
798 if (err)
799 goto sigsegv;
800
801 regs->u_regs[UREG_FP] = (unsigned long) sfp;
802 regs->pc = (unsigned long) sa->sa_handler;
803 regs->npc = (regs->pc + 4);
804
805 #ifdef DEBUG_SIGNALS
806 printk ("Solaris-frame: %x %x\n", (int) regs->pc, (int) regs->npc);
807 #endif
808 /* Arguments passed to signal handler */
809 if (regs->u_regs [14]){
810 struct reg_window *rw = (struct reg_window *) regs->u_regs [14];
811
812 err |= __put_user(signr, &rw->ins [0]);
813 err |= __put_user(si, &rw->ins [1]);
814 err |= __put_user(uc, &rw->ins [2]);
815 err |= __put_user(sfp, &rw->ins [6]); /* frame pointer */
816 if (err)
817 goto sigsegv;
818
819 regs->u_regs[UREG_I0] = signr;
820 regs->u_regs[UREG_I1] = (uint) si;
821 regs->u_regs[UREG_I2] = (uint) uc;
822 }
823 return;
824
825 sigill_and_return:
826 do_exit(SIGILL);
827 sigsegv:
828 do_exit(SIGSEGV);
829 }
830
831 asmlinkage int svr4_getcontext (svr4_ucontext_t *uc, struct pt_regs *regs)
832 {
833 svr4_gregset_t *gr;
834 svr4_mcontext_t *mc;
835 svr4_sigset_t setv;
836 int err = 0;
837
838 synchronize_user_stack();
839
840 if (current->thread.w_saved)
841 goto sigsegv_and_return;
842
843 err = clear_user(uc, sizeof (*uc));
844 if (err)
845 return -EFAULT;
846
847 /* Setup convenience variables */
848 mc = &uc->mcontext;
849 gr = &mc->greg;
850
851 setv.sigbits[0] = current->blocked.sig[0];
852 setv.sigbits[1] = current->blocked.sig[1];
853 if (_NSIG_WORDS >= 4) {
854 setv.sigbits[2] = current->blocked.sig[2];
855 setv.sigbits[3] = current->blocked.sig[3];
856 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
857 } else
858 err |= __copy_to_user(&uc->sigmask, &setv, 2 * sizeof(unsigned int));
859
860 /* Store registers */
861 err |= __put_user(regs->pc, &uc->mcontext.greg [SVR4_PC]);
862 err |= __put_user(regs->npc, &uc->mcontext.greg [SVR4_NPC]);
863 err |= __put_user(regs->psr, &uc->mcontext.greg [SVR4_PSR]);
864 err |= __put_user(regs->y, &uc->mcontext.greg [SVR4_Y]);
865
866 /* Copy g [1..7] and o [0..7] registers */
867 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs [UREG_G1], sizeof (uint) * 7);
868 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs [UREG_I0], sizeof (uint) * 8);
869
870 /* Setup sigaltstack */
871 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
872 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
873 err |= __put_user(current->sas_ss_size, &uc->stack.size);
874
875 /* The register file is not saved
876 * we have already stuffed all of it with sync_user_stack
877 */
878 return (err ? -EFAULT : 0);
879
880 sigsegv_and_return:
881 do_exit(SIGSEGV);
882 }
883
884 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
885 asmlinkage int svr4_setcontext (svr4_ucontext_t *c, struct pt_regs *regs)
886 {
887 struct thread_struct *tp = &current->thread;
888 svr4_gregset_t *gr;
889 unsigned long pc, npc, psr;
890 sigset_t set;
891 svr4_sigset_t setv;
892 int err;
893 stack_t st;
894
895 /* Fixme: restore windows, or is this already taken care of in
896 * svr4_setup_frame when sync_user_windows is done?
897 */
898 flush_user_windows();
899
900 if (tp->w_saved)
901 goto sigsegv_and_return;
902
903 if (((uint) c) & 3)
904 goto sigsegv_and_return;
905
906 if(!__access_ok((unsigned long)c, sizeof(*c)))
907 goto sigsegv_and_return;
908
909 /* Check for valid PC and nPC */
910 gr = &c->mcontext.greg;
911 err = __get_user(pc, &((*gr)[SVR4_PC]));
912 err |= __get_user(npc, &((*gr)[SVR4_NPC]));
913
914 if((pc | npc) & 3)
915 goto sigsegv_and_return;
916
917 /* Retrieve information from passed ucontext */
918 /* note that nPC is ored a 1, this is used to inform entry.S */
919 /* that we don't want it to mess with our PC and nPC */
920
921 /* This is pretty much atomic, no amount locking would prevent
922 * the races which exist anyways.
923 */
924 err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
925
926 err |= __get_user(st.ss_sp, &c->stack.sp);
927 err |= __get_user(st.ss_flags, &c->stack.flags);
928 err |= __get_user(st.ss_size, &c->stack.size);
929
930 if (err)
931 goto sigsegv_and_return;
932
933 /* It is more difficult to avoid calling this function than to
934 call it and ignore errors. */
935 do_sigaltstack(&st, NULL, regs->u_regs[UREG_I6]);
936
937 set.sig[0] = setv.sigbits[0];
938 set.sig[1] = setv.sigbits[1];
939 if (_NSIG_WORDS >= 4) {
940 set.sig[2] = setv.sigbits[2];
941 set.sig[3] = setv.sigbits[3];
942 }
943 sigdelsetmask(&set, ~_BLOCKABLE);
944 spin_lock_irq(&current->sigmask_lock);
945 current->blocked = set;
946 recalc_sigpending(current);
947 spin_unlock_irq(&current->sigmask_lock);
948 regs->pc = pc;
949 regs->npc = npc | 1;
950 err |= __get_user(regs->y, &((*gr) [SVR4_Y]));
951 err |= __get_user(psr, &((*gr) [SVR4_PSR]));
952 regs->psr &= ~(PSR_ICC);
953 regs->psr |= (psr & PSR_ICC);
954
955 /* Restore g[1..7] and o[0..7] registers */
956 err |= __copy_from_user(&regs->u_regs [UREG_G1], &(*gr)[SVR4_G1],
957 sizeof (long) * 7);
958 err |= __copy_from_user(&regs->u_regs [UREG_I0], &(*gr)[SVR4_O0],
959 sizeof (long) * 8);
960 return (err ? -EFAULT : 0);
961
962 sigsegv_and_return:
963 do_exit(SIGSEGV);
964 }
965
966 static inline void
967 handle_signal(unsigned long signr, struct k_sigaction *ka,
968 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
969 int svr4_signal)
970 {
971 if (svr4_signal)
972 setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
973 else {
974 if (ka->sa.sa_flags & SA_SIGINFO)
975 new_setup_rt_frame(ka, regs, signr, oldset, info);
976 else if (current->thread.new_signal)
977 new_setup_frame (ka, regs, signr, oldset);
978 else
979 setup_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
980 }
981 if(ka->sa.sa_flags & SA_ONESHOT)
982 ka->sa.sa_handler = SIG_DFL;
983 if(!(ka->sa.sa_flags & SA_NOMASK)) {
984 spin_lock_irq(&current->sigmask_lock);
985 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
986 sigaddset(&current->blocked, signr);
987 recalc_sigpending(current);
988 spin_unlock_irq(&current->sigmask_lock);
989 }
990 }
991
992 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
993 struct sigaction *sa)
994 {
995 switch(regs->u_regs[UREG_I0]) {
996 case ERESTARTNOHAND:
997 no_system_call_restart:
998 regs->u_regs[UREG_I0] = EINTR;
999 regs->psr |= PSR_C;
1000 break;
1001 case ERESTARTSYS:
1002 if(!(sa->sa_flags & SA_RESTART))
1003 goto no_system_call_restart;
1004 /* fallthrough */
1005 case ERESTARTNOINTR:
1006 regs->u_regs[UREG_I0] = orig_i0;
1007 regs->pc -= 4;
1008 regs->npc -= 4;
1009 }
1010 }
1011
1012 #ifdef DEBUG_SIGNALS_MAPS
1013
1014 #define MAPS_LINE_FORMAT "%08lx-%08lx %s %08lx %s %lu "
1015
1016 static inline void read_maps (void)
1017 {
1018 struct vm_area_struct * map, * next;
1019 char * buffer;
1020 ssize_t i;
1021
1022 buffer = (char*)__get_free_page(GFP_KERNEL);
1023 if (!buffer)
1024 return;
1025
1026 for (map = current->mm->mmap ; map ; map = next ) {
1027 /* produce the next line */
1028 char *line;
1029 char str[5], *cp = str;
1030 int flags;
1031 kdev_t dev;
1032 unsigned long ino;
1033
1034 /*
1035 * Get the next vma now (but it won't be used if we sleep).
1036 */
1037 next = map->vm_next;
1038 flags = map->vm_flags;
1039
1040 *cp++ = flags & VM_READ ? 'r' : '-';
1041 *cp++ = flags & VM_WRITE ? 'w' : '-';
1042 *cp++ = flags & VM_EXEC ? 'x' : '-';
1043 *cp++ = flags & VM_MAYSHARE ? 's' : 'p';
1044 *cp++ = 0;
1045
1046 dev = 0;
1047 ino = 0;
1048 if (map->vm_file != NULL) {
1049 dev = map->vm_file->f_dentry->d_inode->i_dev;
1050 ino = map->vm_file->f_dentry->d_inode->i_ino;
1051 line = d_path(map->vm_file->f_dentry, buffer, PAGE_SIZE);
1052 }
1053 printk(MAPS_LINE_FORMAT, map->vm_start, map->vm_end, str, map->vm_offset,
1054 kdevname(dev), ino);
1055 if (map->vm_file != NULL)
1056 printk("%s\n", line);
1057 else
1058 printk("\n");
1059 }
1060 free_page((unsigned long)buffer);
1061 return;
1062 }
1063 #endif
1064
1065 /* Note that 'init' is a special process: it doesn't get signals it doesn't
1066 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1067 * mistake.
1068 */
1069 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
1070 unsigned long orig_i0, int restart_syscall)
1071 {
1072 unsigned long signr;
1073 struct k_sigaction *ka;
1074 siginfo_t info;
1075
1076 int svr4_signal = current->personality == PER_SVR4;
1077
1078 if (!oldset)
1079 oldset = &current->blocked;
1080
1081 for (;;) {
1082 spin_lock_irq(&current->sigmask_lock);
1083 signr = dequeue_signal(&current->blocked, &info);
1084 spin_unlock_irq(&current->sigmask_lock);
1085
1086 if (!signr) break;
1087
1088 if ((current->flags & PF_PTRACED) && signr != SIGKILL) {
1089 current->exit_code = signr;
1090 current->state = TASK_STOPPED;
1091
1092 /* This happens to be SMP safe so no need to
1093 * grab master kernel lock even in this case.
1094 */
1095 notify_parent(current, SIGCHLD);
1096 schedule();
1097 if (!(signr = current->exit_code))
1098 continue;
1099 current->exit_code = 0;
1100 if (signr == SIGSTOP)
1101 continue;
1102
1103 /* Update the siginfo structure. Is this good? */
1104 if (signr != info.si_signo) {
1105 info.si_signo = signr;
1106 info.si_errno = 0;
1107 info.si_code = SI_USER;
1108 info.si_pid = current->p_pptr->pid;
1109 info.si_uid = current->p_pptr->uid;
1110 }
1111
1112 /* If the (new) signal is now blocked, requeue it. */
1113 if (sigismember(&current->blocked, signr)) {
1114 send_sig_info(signr, &info, current);
1115 continue;
1116 }
1117 }
1118
1119 ka = &current->sig->action[signr-1];
1120
1121 if(ka->sa.sa_handler == SIG_IGN) {
1122 if(signr != SIGCHLD)
1123 continue;
1124
1125 /* sys_wait4() grabs the master kernel lock, so
1126 * we need not do so, that sucker should be
1127 * threaded and would not be that difficult to
1128 * do anyways.
1129 */
1130 while(sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
1131 ;
1132 continue;
1133 }
1134 if(ka->sa.sa_handler == SIG_DFL) {
1135 unsigned long exit_code = signr;
1136
1137 if(current->pid == 1)
1138 continue;
1139 switch(signr) {
1140 case SIGCONT: case SIGCHLD: case SIGWINCH:
1141 continue;
1142
1143 case SIGTSTP: case SIGTTIN: case SIGTTOU:
1144 /* The operations performed by
1145 * is_orphaned_pgrp() are protected by
1146 * the tasklist_lock.
1147 */
1148 if (is_orphaned_pgrp(current->pgrp))
1149 continue;
1150
1151 case SIGSTOP:
1152 if (current->flags & PF_PTRACED)
1153 continue;
1154 current->state = TASK_STOPPED;
1155 current->exit_code = signr;
1156
1157 /* notify_parent() is SMP safe */
1158 if(!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags &
1159 SA_NOCLDSTOP))
1160 notify_parent(current, SIGCHLD);
1161 schedule();
1162 continue;
1163
1164 case SIGQUIT: case SIGILL: case SIGTRAP:
1165 case SIGABRT: case SIGFPE: case SIGSEGV: case SIGBUS:
1166 if (do_coredump(signr, regs))
1167 exit_code |= 0x80;
1168 #ifdef DEBUG_SIGNALS
1169 /* Very useful to debug dynamic linker problems */
1170 printk ("Sig %ld going for %s[%d]...\n", signr, current->comm, current->pid);
1171 show_regs (regs);
1172 #ifdef DEBUG_SIGNALS_TRACE
1173 {
1174 struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP];
1175 unsigned int ins[8];
1176
1177 while(rw &&
1178 !(((unsigned long) rw) & 0x3)) {
1179 copy_from_user(ins, &rw->ins[0], sizeof(ins));
1180 printk("Caller[%08x](%08x,%08x,%08x,%08x,%08x,%08x)\n", ins[7], ins[0], ins[1], ins[2], ins[3], ins[4], ins[5]);
1181 rw = (struct reg_window *)(unsigned long)ins[6];
1182 }
1183 }
1184 #endif
1185 #ifdef DEBUG_SIGNALS_MAPS
1186 printk("Maps:\n");
1187 read_maps();
1188 #endif
1189 #endif
1190 /* fall through */
1191 default:
1192 lock_kernel();
1193 sigaddset(&current->signal, signr);
1194 recalc_sigpending(current);
1195 current->flags |= PF_SIGNALED;
1196 do_exit(exit_code);
1197 /* NOT REACHED */
1198 }
1199 }
1200 if(restart_syscall)
1201 syscall_restart(orig_i0, regs, &ka->sa);
1202 handle_signal(signr, ka, &info, oldset, regs, svr4_signal);
1203 return 1;
1204 }
1205 if(restart_syscall &&
1206 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1207 regs->u_regs[UREG_I0] == ERESTARTSYS ||
1208 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1209 /* replay the system call when we are done */
1210 regs->u_regs[UREG_I0] = orig_i0;
1211 regs->pc -= 4;
1212 regs->npc -= 4;
1213 }
1214 return 0;
1215 }
1216
1217 asmlinkage int
1218 do_sys_sigstack(struct sigstack *ssptr, struct sigstack *ossptr, unsigned long sp)
1219 {
1220 int ret = -EFAULT;
1221
1222 /* First see if old state is wanted. */
1223 if (ossptr) {
1224 if (put_user(current->sas_ss_sp + current->sas_ss_size, &ossptr->the_stack) ||
1225 __put_user(on_sig_stack(sp), &ossptr->cur_status))
1226 goto out;
1227 }
1228
1229 /* Now see if we want to update the new state. */
1230 if (ssptr) {
1231 void *ss_sp;
1232
1233 if (get_user((long)ss_sp, &ssptr->the_stack))
1234 goto out;
1235 /* If the current stack was set with sigaltstack, don't
1236 swap stacks while we are on it. */
1237 ret = -EPERM;
1238 if (current->sas_ss_sp && on_sig_stack(sp))
1239 goto out;
1240
1241 /* Since we don't know the extent of the stack, and we don't
1242 track onstack-ness, but rather calculate it, we must
1243 presume a size. Ho hum this interface is lossy. */
1244 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
1245 current->sas_ss_size = SIGSTKSZ;
1246 }
1247 ret = 0;
1248 out:
1249 return ret;
1250 }
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