1 /* $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem 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/config.h>
11 #include <linux/sched.h>
12 #include <linux/kernel.h>
13 #include <linux/signal.h>
14 #include <linux/errno.h>
15 #include <linux/wait.h>
16 #include <linux/ptrace.h>
17 #include <linux/unistd.h>
18 #include <linux/mm.h>
19 #include <linux/tty.h>
20 #include <linux/smp.h>
21 #include <linux/smp_lock.h>
22 #include <linux/binfmts.h> /* do_coredum */
23
24 #include <asm/uaccess.h>
25 #include <asm/bitops.h>
26 #include <asm/ptrace.h>
27 #include <asm/svr4.h>
28 #include <asm/pgalloc.h>
29 #include <asm/pgtable.h>
30 #include <asm/cacheflush.h> /* flush_sig_insns */
31
32 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
33
34 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
35 void *fpqueue, unsigned long *fpqdepth);
36 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
37
38 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
39 unsigned long orig_o0, int restart_syscall);
40
41 /* Signal frames: the original one (compatible with SunOS):
42 *
43 * Set up a signal frame... Make the stack look the way SunOS
44 * expects it to look which is basically:
45 *
46 * ---------------------------------- <-- %sp at signal time
47 * Struct sigcontext
48 * Signal address
49 * Ptr to sigcontext area above
50 * Signal code
51 * The signal number itself
52 * One register window
53 * ---------------------------------- <-- New %sp
54 */
55 struct signal_sframe {
56 struct reg_window sig_window;
57 int sig_num;
58 int sig_code;
59 struct sigcontext __user *sig_scptr;
60 int sig_address;
61 struct sigcontext sig_context;
62 unsigned int extramask[_NSIG_WORDS - 1];
63 };
64
65 /*
66 * And the new one, intended to be used for Linux applications only
67 * (we have enough in there to work with clone).
68 * All the interesting bits are in the info field.
69 */
70
71 struct new_signal_frame {
72 struct sparc_stackf ss;
73 __siginfo_t info;
74 __siginfo_fpu_t __user *fpu_save;
75 unsigned long insns[2] __attribute__ ((aligned (8)));
76 unsigned int extramask[_NSIG_WORDS - 1];
77 unsigned int extra_size; /* Should be 0 */
78 __siginfo_fpu_t fpu_state;
79 };
80
81 struct rt_signal_frame {
82 struct sparc_stackf ss;
83 siginfo_t info;
84 struct pt_regs regs;
85 sigset_t mask;
86 __siginfo_fpu_t __user *fpu_save;
87 unsigned int insns[2];
88 stack_t stack;
89 unsigned int extra_size; /* Should be 0 */
90 __siginfo_fpu_t fpu_state;
91 };
92
93 /* Align macros */
94 #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7)))
95 #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7)))
96 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
97
98 /*
99 * atomically swap in the new signal mask, and wait for a signal.
100 * This is really tricky on the Sparc, watch out...
101 */
102 asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
103 {
104 sigset_t saveset;
105
106 set &= _BLOCKABLE;
107 spin_lock_irq(¤t->sighand->siglock);
108 saveset = current->blocked;
109 siginitset(¤t->blocked, set);
110 recalc_sigpending();
111 spin_unlock_irq(¤t->sighand->siglock);
112
113 regs->pc = regs->npc;
114 regs->npc += 4;
115
116 /* Condition codes and return value where set here for sigpause,
117 * and so got used by setup_frame, which again causes sigreturn()
118 * to return -EINTR.
119 */
120 while (1) {
121 current->state = TASK_INTERRUPTIBLE;
122 schedule();
123 /*
124 * Return -EINTR and set condition code here,
125 * so the interrupted system call actually returns
126 * these.
127 */
128 regs->psr |= PSR_C;
129 regs->u_regs[UREG_I0] = EINTR;
130 if (do_signal(&saveset, regs, 0, 0))
131 return;
132 }
133 }
134
135 asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
136 {
137 _sigpause_common(set, regs);
138 }
139
140 asmlinkage void do_sigsuspend (struct pt_regs *regs)
141 {
142 _sigpause_common(regs->u_regs[UREG_I0], regs);
143 }
144
145 asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
146 struct pt_regs *regs)
147 {
148 sigset_t oldset, set;
149
150 /* XXX: Don't preclude handling different sized sigset_t's. */
151 if (sigsetsize != sizeof(sigset_t)) {
152 regs->psr |= PSR_C;
153 regs->u_regs[UREG_I0] = EINVAL;
154 return;
155 }
156
157 if (copy_from_user(&set, uset, sizeof(set))) {
158 regs->psr |= PSR_C;
159 regs->u_regs[UREG_I0] = EFAULT;
160 return;
161 }
162
163 sigdelsetmask(&set, ~_BLOCKABLE);
164 spin_lock_irq(¤t->sighand->siglock);
165 oldset = current->blocked;
166 current->blocked = set;
167 recalc_sigpending();
168 spin_unlock_irq(¤t->sighand->siglock);
169
170 regs->pc = regs->npc;
171 regs->npc += 4;
172
173 /* Condition codes and return value where set here for sigpause,
174 * and so got used by setup_frame, which again causes sigreturn()
175 * to return -EINTR.
176 */
177 while (1) {
178 current->state = TASK_INTERRUPTIBLE;
179 schedule();
180 /*
181 * Return -EINTR and set condition code here,
182 * so the interrupted system call actually returns
183 * these.
184 */
185 regs->psr |= PSR_C;
186 regs->u_regs[UREG_I0] = EINTR;
187 if (do_signal(&oldset, regs, 0, 0))
188 return;
189 }
190 }
191
192 static inline int
193 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
194 {
195 int err;
196 #ifdef CONFIG_SMP
197 if (test_tsk_thread_flag(current, TIF_USEDFPU))
198 regs->psr &= ~PSR_EF;
199 #else
200 if (current == last_task_used_math) {
201 last_task_used_math = 0;
202 regs->psr &= ~PSR_EF;
203 }
204 #endif
205 current->used_math = 1;
206 clear_tsk_thread_flag(current, TIF_USEDFPU);
207
208 if (verify_area(VERIFY_READ, fpu, sizeof(*fpu)))
209 return -EFAULT;
210
211 err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0],
212 (sizeof(unsigned long) * 32));
213 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
214 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
215 if (current->thread.fpqdepth != 0)
216 err |= __copy_from_user(¤t->thread.fpqueue[0],
217 &fpu->si_fpqueue[0],
218 ((sizeof(unsigned long) +
219 (sizeof(unsigned long *)))*16));
220 return err;
221 }
222
223 static inline void do_new_sigreturn (struct pt_regs *regs)
224 {
225 struct new_signal_frame __user *sf;
226 unsigned long up_psr, pc, npc;
227 sigset_t set;
228 __siginfo_fpu_t __user *fpu_save;
229 int err;
230
231 sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP];
232
233 /* 1. Make sure we are not getting garbage from the user */
234 if (verify_area(VERIFY_READ, sf, sizeof(*sf)))
235 goto segv_and_exit;
236
237 if (((uint) sf) & 3)
238 goto segv_and_exit;
239
240 err = __get_user(pc, &sf->info.si_regs.pc);
241 err |= __get_user(npc, &sf->info.si_regs.npc);
242
243 if ((pc | npc) & 3)
244 goto segv_and_exit;
245
246 /* 2. Restore the state */
247 up_psr = regs->psr;
248 err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
249
250 /* User can only change condition codes and FPU enabling in %psr. */
251 regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
252 | (regs->psr & (PSR_ICC | PSR_EF));
253
254 err |= __get_user(fpu_save, &sf->fpu_save);
255
256 if (fpu_save)
257 err |= restore_fpu_state(regs, fpu_save);
258
259 /* This is pretty much atomic, no amount locking would prevent
260 * the races which exist anyways.
261 */
262 err |= __get_user(set.sig[0], &sf->info.si_mask);
263 err |= __copy_from_user(&set.sig[1], &sf->extramask,
264 (_NSIG_WORDS-1) * sizeof(unsigned int));
265
266 if (err)
267 goto segv_and_exit;
268
269 sigdelsetmask(&set, ~_BLOCKABLE);
270 spin_lock_irq(¤t->sighand->siglock);
271 current->blocked = set;
272 recalc_sigpending();
273 spin_unlock_irq(¤t->sighand->siglock);
274 return;
275
276 segv_and_exit:
277 do_exit(SIGSEGV);
278 }
279
280 asmlinkage void do_sigreturn(struct pt_regs *regs)
281 {
282 struct sigcontext __user *scptr;
283 unsigned long pc, npc, psr;
284 sigset_t set;
285 int err;
286
287 /* Always make any pending restarted system calls return -EINTR */
288 current_thread_info()->restart_block.fn = do_no_restart_syscall;
289
290 synchronize_user_stack();
291
292 if (current->thread.new_signal)
293 return do_new_sigreturn(regs);
294
295 scptr = (struct sigcontext __user *) 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(¤t->sighand->siglock);
321 current->blocked = set;
322 recalc_sigpending();
323 spin_unlock_irq(¤t->sighand->siglock);
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 __user *sf;
348 unsigned int psr, pc, npc;
349 __siginfo_fpu_t __user *fpu_save;
350 sigset_t set;
351 stack_t st;
352 int err;
353
354 synchronize_user_stack();
355 sf = (struct rt_signal_frame __user *) 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(®s->u_regs[UREG_G1],
368 &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 */
389 do_sigaltstack(&st, NULL, (unsigned long)sf);
390
391 sigdelsetmask(&set, ~_BLOCKABLE);
392 spin_lock_irq(¤t->sighand->siglock);
393 current->blocked = set;
394 recalc_sigpending();
395 spin_unlock_irq(¤t->sighand->siglock);
396 return;
397 segv:
398 send_sig(SIGSEGV, current, 1);
399 }
400
401 /* Checks if the fp is valid */
402 static inline int invalid_frame_pointer(void __user *fp, int fplen)
403 {
404 if ((((unsigned long) fp) & 7) ||
405 !__access_ok((unsigned long)fp, fplen) ||
406 ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
407 ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
408 return 1;
409
410 return 0;
411 }
412
413 static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
414 {
415 unsigned long sp;
416
417 sp = regs->u_regs[UREG_FP];
418
419 /* This is the X/Open sanctioned signal stack switching. */
420 if (sa->sa_flags & SA_ONSTACK) {
421 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
422 sp = current->sas_ss_sp + current->sas_ss_size;
423 }
424 return (void __user *)(sp - framesize);
425 }
426
427 static inline void
428 setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
429 {
430 struct signal_sframe __user *sframep;
431 struct sigcontext __user *sc;
432 int window = 0, err;
433 unsigned long pc = regs->pc;
434 unsigned long npc = regs->npc;
435 void *sig_address;
436 int sig_code;
437
438 synchronize_user_stack();
439 sframep = (struct signal_sframe __user *)
440 get_sigframe(sa, regs, SF_ALIGNEDSZ);
441 if (invalid_frame_pointer(sframep, sizeof(*sframep))){
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 put_user((char *)current->thread.rwbuf_stkptrs[window],
466 &sc->sigc_spbuf[window]);
467 err |= __copy_to_user(&sc->sigc_wbuf[window],
468 ¤t->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
477 err |= __put_user(signr, &sframep->sig_num);
478 sig_address = NULL;
479 sig_code = 0;
480 if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
481 sig_address = info->si_addr;
482 switch (signr) {
483 case SIGSEGV:
484 switch (info->si_code) {
485 case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
486 default: sig_code = SUBSIG_PROTECTION; break;
487 }
488 break;
489 case SIGILL:
490 switch (info->si_code) {
491 case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
492 case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
493 case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
494 default: sig_code = SUBSIG_STACK; break;
495 }
496 break;
497 case SIGFPE:
498 switch (info->si_code) {
499 case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
500 case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
501 case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
502 case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
503 case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
504 case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
505 case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
506 default: sig_code = SUBSIG_FPERROR; break;
507 }
508 break;
509 case SIGBUS:
510 switch (info->si_code) {
511 case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
512 case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
513 default: sig_code = SUBSIG_BUSTIMEOUT; break;
514 }
515 break;
516 case SIGEMT:
517 switch (info->si_code) {
518 case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
519 }
520 break;
521 case SIGSYS:
522 if (info->si_code == (__SI_FAULT|0x100)) {
523 /* See sys_sunos.c */
524 sig_code = info->si_trapno;
525 break;
526 }
527 default:
528 sig_address = NULL;
529 }
530 }
531 err |= __put_user((long)sig_address, &sframep->sig_address);
532 err |= __put_user(sig_code, &sframep->sig_code);
533 err |= __put_user(sc, &sframep->sig_scptr);
534 if (err)
535 goto sigsegv;
536
537 regs->u_regs[UREG_FP] = (unsigned long) sframep;
538 regs->pc = (unsigned long) sa->sa_handler;
539 regs->npc = (regs->pc + 4);
540 return;
541
542 sigill_and_return:
543 do_exit(SIGILL);
544 sigsegv:
545 do_exit(SIGSEGV);
546 }
547
548
549 static inline int
550 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
551 {
552 int err = 0;
553 #ifdef CONFIG_SMP
554 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
555 put_psr(get_psr() | PSR_EF);
556 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
557 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
558 regs->psr &= ~(PSR_EF);
559 clear_tsk_thread_flag(current, TIF_USEDFPU);
560 }
561 #else
562 if (current == last_task_used_math) {
563 put_psr(get_psr() | PSR_EF);
564 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
565 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
566 last_task_used_math = 0;
567 regs->psr &= ~(PSR_EF);
568 }
569 #endif
570 err |= __copy_to_user(&fpu->si_float_regs[0],
571 ¤t->thread.float_regs[0],
572 (sizeof(unsigned long) * 32));
573 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
574 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
575 if (current->thread.fpqdepth != 0)
576 err |= __copy_to_user(&fpu->si_fpqueue[0],
577 ¤t->thread.fpqueue[0],
578 ((sizeof(unsigned long) +
579 (sizeof(unsigned long *)))*16));
580 current->used_math = 0;
581 return err;
582 }
583
584 static inline void
585 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
586 int signo, sigset_t *oldset)
587 {
588 struct new_signal_frame __user *sf;
589 int sigframe_size, err;
590
591 /* 1. Make sure everything is clean */
592 synchronize_user_stack();
593
594 sigframe_size = NF_ALIGNEDSZ;
595 if (!current->used_math)
596 sigframe_size -= sizeof(__siginfo_fpu_t);
597
598 sf = (struct new_signal_frame __user *)
599 get_sigframe(&ka->sa, regs, sigframe_size);
600
601 if (invalid_frame_pointer(sf, sigframe_size))
602 goto sigill_and_return;
603
604 if (current->thread.w_saved != 0)
605 goto sigill_and_return;
606
607 /* 2. Save the current process state */
608 err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
609
610 err |= __put_user(0, &sf->extra_size);
611
612 if (current->used_math) {
613 err |= save_fpu_state(regs, &sf->fpu_state);
614 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
615 } else {
616 err |= __put_user(0, &sf->fpu_save);
617 }
618
619 err |= __put_user(oldset->sig[0], &sf->info.si_mask);
620 err |= __copy_to_user(sf->extramask, &oldset->sig[1],
621 (_NSIG_WORDS - 1) * sizeof(unsigned int));
622 err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
623 sizeof(struct reg_window));
624 if (err)
625 goto sigsegv;
626
627 /* 3. signal handler back-trampoline and parameters */
628 regs->u_regs[UREG_FP] = (unsigned long) sf;
629 regs->u_regs[UREG_I0] = signo;
630 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
631
632 /* 4. signal handler */
633 regs->pc = (unsigned long) ka->sa.sa_handler;
634 regs->npc = (regs->pc + 4);
635
636 /* 5. return to kernel instructions */
637 if (ka->ka_restorer)
638 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
639 else {
640 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
641
642 /* mov __NR_sigreturn, %g1 */
643 err |= __put_user(0x821020d8, &sf->insns[0]);
644
645 /* t 0x10 */
646 err |= __put_user(0x91d02010, &sf->insns[1]);
647 if (err)
648 goto sigsegv;
649
650 /* Flush instruction space. */
651 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
652 }
653 return;
654
655 sigill_and_return:
656 do_exit(SIGILL);
657 sigsegv:
658 do_exit(SIGSEGV);
659 }
660
661 static inline void
662 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
663 int signo, sigset_t *oldset, siginfo_t *info)
664 {
665 struct rt_signal_frame __user *sf;
666 int sigframe_size;
667 unsigned int psr;
668 int err;
669
670 synchronize_user_stack();
671 sigframe_size = RT_ALIGNEDSZ;
672 if (!current->used_math)
673 sigframe_size -= sizeof(__siginfo_fpu_t);
674 sf = (struct rt_signal_frame __user *)
675 get_sigframe(&ka->sa, regs, sigframe_size);
676 if (invalid_frame_pointer(sf, sigframe_size))
677 goto sigill;
678 if (current->thread.w_saved != 0)
679 goto sigill;
680
681 err = __put_user(regs->pc, &sf->regs.pc);
682 err |= __put_user(regs->npc, &sf->regs.npc);
683 err |= __put_user(regs->y, &sf->regs.y);
684 psr = regs->psr;
685 if (current->used_math)
686 psr |= PSR_EF;
687 err |= __put_user(psr, &sf->regs.psr);
688 err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
689 err |= __put_user(0, &sf->extra_size);
690
691 if (psr & PSR_EF) {
692 err |= save_fpu_state(regs, &sf->fpu_state);
693 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
694 } else {
695 err |= __put_user(0, &sf->fpu_save);
696 }
697 err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
698
699 /* Setup sigaltstack */
700 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
701 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
702 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
703
704 err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
705 sizeof(struct reg_window));
706
707 err |= copy_siginfo_to_user(&sf->info, info);
708
709 if (err)
710 goto sigsegv;
711
712 regs->u_regs[UREG_FP] = (unsigned long) sf;
713 regs->u_regs[UREG_I0] = signo;
714 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
715
716 regs->pc = (unsigned long) ka->sa.sa_handler;
717 regs->npc = (regs->pc + 4);
718
719 if (ka->ka_restorer)
720 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
721 else {
722 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
723
724 /* mov __NR_sigreturn, %g1 */
725 err |= __put_user(0x821020d8, &sf->insns[0]);
726
727 /* t 0x10 */
728 err |= __put_user(0x91d02010, &sf->insns[1]);
729 if (err)
730 goto sigsegv;
731
732 /* Flush instruction space. */
733 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
734 }
735 return;
736
737 sigill:
738 do_exit(SIGILL);
739 sigsegv:
740 do_exit(SIGSEGV);
741 }
742
743 /* Setup a Solaris stack frame */
744 static inline void
745 setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
746 struct pt_regs *regs, int signr, sigset_t *oldset)
747 {
748 svr4_signal_frame_t __user *sfp;
749 svr4_gregset_t __user *gr;
750 svr4_siginfo_t __user *si;
751 svr4_mcontext_t __user *mc;
752 svr4_gwindows_t __user *gw;
753 svr4_ucontext_t __user *uc;
754 svr4_sigset_t setv;
755 int window = 0, err;
756
757 synchronize_user_stack();
758 sfp = (svr4_signal_frame_t __user *)
759 get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window));
760
761 if (invalid_frame_pointer(sfp, sizeof(*sfp)))
762 goto sigill_and_return;
763
764 /* Start with a clean frame pointer and fill it */
765 err = __clear_user(sfp, sizeof(*sfp));
766
767 /* Setup convenience variables */
768 si = &sfp->si;
769 uc = &sfp->uc;
770 gw = &sfp->gw;
771 mc = &uc->mcontext;
772 gr = &mc->greg;
773
774 /* FIXME: where am I supposed to put this?
775 * sc->sigc_onstack = old_status;
776 * anyways, it does not look like it is used for anything at all.
777 */
778 setv.sigbits[0] = oldset->sig[0];
779 setv.sigbits[1] = oldset->sig[1];
780 if (_NSIG_WORDS >= 4) {
781 setv.sigbits[2] = oldset->sig[2];
782 setv.sigbits[3] = oldset->sig[3];
783 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
784 } else
785 err |= __copy_to_user(&uc->sigmask, &setv,
786 2 * sizeof(unsigned int));
787
788 /* Store registers */
789 err |= __put_user(regs->pc, &((*gr)[SVR4_PC]));
790 err |= __put_user(regs->npc, &((*gr)[SVR4_NPC]));
791 err |= __put_user(regs->psr, &((*gr)[SVR4_PSR]));
792 err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
793
794 /* Copy g[1..7] and o[0..7] registers */
795 err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1],
796 sizeof(long) * 7);
797 err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0],
798 sizeof(long) * 8);
799
800 /* Setup sigaltstack */
801 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
802 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
803 err |= __put_user(current->sas_ss_size, &uc->stack.size);
804
805 /* Save the currently window file: */
806
807 /* 1. Link sfp->uc->gwins to our windows */
808 err |= __put_user(gw, &mc->gwin);
809
810 /* 2. Number of windows to restore at setcontext(): */
811 err |= __put_user(current->thread.w_saved, &gw->count);
812
813 /* 3. Save each valid window
814 * Currently, it makes a copy of the windows from the kernel copy.
815 * David's code for SunOS, makes the copy but keeps the pointer to
816 * the kernel. My version makes the pointer point to a userland
817 * copy of those. Mhm, I wonder if I shouldn't just ignore those
818 * on setcontext and use those that are on the kernel, the signal
819 * handler should not be modyfing those, mhm.
820 *
821 * These windows are just used in case synchronize_user_stack failed
822 * to flush the user windows.
823 */
824 for (window = 0; window < current->thread.w_saved; window++) {
825 err |= __put_user((int *) &(gw->win[window]), &gw->winptr[window]);
826 err |= __copy_to_user(&gw->win[window],
827 ¤t->thread.reg_window[window],
828 sizeof(svr4_rwindow_t));
829 err |= __put_user(0, gw->winptr[window]);
830 }
831
832 /* 4. We just pay attention to the gw->count field on setcontext */
833 current->thread.w_saved = 0; /* So process is allowed to execute. */
834
835 /* Setup the signal information. Solaris expects a bunch of
836 * information to be passed to the signal handler, we don't provide
837 * that much currently, should use siginfo.
838 */
839 err |= __put_user(signr, &si->siginfo.signo);
840 err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
841 if (err)
842 goto sigsegv;
843
844 regs->u_regs[UREG_FP] = (unsigned long) sfp;
845 regs->pc = (unsigned long) sa->sa_handler;
846 regs->npc = (regs->pc + 4);
847
848 /* Arguments passed to signal handler */
849 if (regs->u_regs[14]){
850 struct reg_window *rw = (struct reg_window __user *)
851 regs->u_regs[14];
852
853 err |= __put_user(signr, &rw->ins[0]);
854 err |= __put_user(si, &rw->ins[1]);
855 err |= __put_user(uc, &rw->ins[2]);
856 err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */
857 if (err)
858 goto sigsegv;
859
860 regs->u_regs[UREG_I0] = signr;
861 regs->u_regs[UREG_I1] = (uint) si;
862 regs->u_regs[UREG_I2] = (uint) uc;
863 }
864 return;
865
866 sigill_and_return:
867 do_exit(SIGILL);
868 sigsegv:
869 do_exit(SIGSEGV);
870 }
871
872 asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
873 {
874 svr4_gregset_t __user *gr;
875 svr4_mcontext_t __user *mc;
876 svr4_sigset_t setv;
877 int err = 0;
878
879 synchronize_user_stack();
880
881 if (current->thread.w_saved)
882 goto sigsegv_and_return;
883
884 err = clear_user(uc, sizeof(*uc));
885 if (err)
886 return -EFAULT;
887
888 /* Setup convenience variables */
889 mc = &uc->mcontext;
890 gr = &mc->greg;
891
892 setv.sigbits[0] = current->blocked.sig[0];
893 setv.sigbits[1] = current->blocked.sig[1];
894 if (_NSIG_WORDS >= 4) {
895 setv.sigbits[2] = current->blocked.sig[2];
896 setv.sigbits[3] = current->blocked.sig[3];
897 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
898 } else
899 err |= __copy_to_user(&uc->sigmask, &setv,
900 2 * sizeof(unsigned int));
901
902 /* Store registers */
903 err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]);
904 err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]);
905 err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]);
906 err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
907
908 /* Copy g[1..7] and o[0..7] registers */
909 err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1],
910 sizeof(uint) * 7);
911 err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0],
912 sizeof(uint) * 8);
913
914 /* Setup sigaltstack */
915 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
916 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
917 err |= __put_user(current->sas_ss_size, &uc->stack.size);
918
919 /* The register file is not saved
920 * we have already stuffed all of it with sync_user_stack
921 */
922 return (err ? -EFAULT : 0);
923
924 sigsegv_and_return:
925 do_exit(SIGSEGV);
926 }
927
928 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
929 asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
930 {
931 struct thread_struct *tp = ¤t->thread;
932 svr4_gregset_t __user *gr;
933 unsigned long pc, npc, psr;
934 sigset_t set;
935 svr4_sigset_t setv;
936 int err;
937 stack_t st;
938
939 /* Fixme: restore windows, or is this already taken care of in
940 * svr4_setup_frame when sync_user_windows is done?
941 */
942 flush_user_windows();
943
944 if (tp->w_saved)
945 goto sigsegv_and_return;
946
947 if (((uint) c) & 3)
948 goto sigsegv_and_return;
949
950 if (!__access_ok((unsigned long)c, sizeof(*c)))
951 goto sigsegv_and_return;
952
953 /* Check for valid PC and nPC */
954 gr = &c->mcontext.greg;
955 err = __get_user(pc, &((*gr)[SVR4_PC]));
956 err |= __get_user(npc, &((*gr)[SVR4_NPC]));
957
958 if ((pc | npc) & 3)
959 goto sigsegv_and_return;
960
961 /* Retrieve information from passed ucontext */
962 /* note that nPC is ored a 1, this is used to inform entry.S */
963 /* that we don't want it to mess with our PC and nPC */
964
965 /* This is pretty much atomic, no amount locking would prevent
966 * the races which exist anyways.
967 */
968 err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
969
970 err |= __get_user(st.ss_sp, &c->stack.sp);
971 err |= __get_user(st.ss_flags, &c->stack.flags);
972 err |= __get_user(st.ss_size, &c->stack.size);
973
974 if (err)
975 goto sigsegv_and_return;
976
977 /* It is more difficult to avoid calling this function than to
978 call it and ignore errors. */
979 do_sigaltstack(&st, NULL, regs->u_regs[UREG_I6]);
980
981 set.sig[0] = setv.sigbits[0];
982 set.sig[1] = setv.sigbits[1];
983 if (_NSIG_WORDS >= 4) {
984 set.sig[2] = setv.sigbits[2];
985 set.sig[3] = setv.sigbits[3];
986 }
987 sigdelsetmask(&set, ~_BLOCKABLE);
988 spin_lock_irq(¤t->sighand->siglock);
989 current->blocked = set;
990 recalc_sigpending();
991 spin_unlock_irq(¤t->sighand->siglock);
992 regs->pc = pc;
993 regs->npc = npc | 1;
994 err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
995 err |= __get_user(psr, &((*gr)[SVR4_PSR]));
996 regs->psr &= ~(PSR_ICC);
997 regs->psr |= (psr & PSR_ICC);
998
999 /* Restore g[1..7] and o[0..7] registers */
1000 err |= __copy_from_user(®s->u_regs[UREG_G1], &(*gr)[SVR4_G1],
1001 sizeof(long) * 7);
1002 err |= __copy_from_user(®s->u_regs[UREG_I0], &(*gr)[SVR4_O0],
1003 sizeof(long) * 8);
1004 return (err ? -EFAULT : 0);
1005
1006 sigsegv_and_return:
1007 do_exit(SIGSEGV);
1008 }
1009
1010 static inline void
1011 handle_signal(unsigned long signr, struct k_sigaction *ka,
1012 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
1013 int svr4_signal)
1014 {
1015 if (svr4_signal)
1016 setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
1017 else {
1018 if (ka->sa.sa_flags & SA_SIGINFO)
1019 new_setup_rt_frame(ka, regs, signr, oldset, info);
1020 else if (current->thread.new_signal)
1021 new_setup_frame(ka, regs, signr, oldset);
1022 else
1023 setup_frame(&ka->sa, regs, signr, oldset, info);
1024 }
1025 if (ka->sa.sa_flags & SA_ONESHOT)
1026 ka->sa.sa_handler = SIG_DFL;
1027 if (!(ka->sa.sa_flags & SA_NOMASK)) {
1028 spin_lock_irq(¤t->sighand->siglock);
1029 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
1030 sigaddset(¤t->blocked, signr);
1031 recalc_sigpending();
1032 spin_unlock_irq(¤t->sighand->siglock);
1033 }
1034 }
1035
1036 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
1037 struct sigaction *sa)
1038 {
1039 switch(regs->u_regs[UREG_I0]) {
1040 case ERESTART_RESTARTBLOCK:
1041 case ERESTARTNOHAND:
1042 no_system_call_restart:
1043 regs->u_regs[UREG_I0] = EINTR;
1044 regs->psr |= PSR_C;
1045 break;
1046 case ERESTARTSYS:
1047 if (!(sa->sa_flags & SA_RESTART))
1048 goto no_system_call_restart;
1049 /* fallthrough */
1050 case ERESTARTNOINTR:
1051 regs->u_regs[UREG_I0] = orig_i0;
1052 regs->pc -= 4;
1053 regs->npc -= 4;
1054 }
1055 }
1056
1057 /* Note that 'init' is a special process: it doesn't get signals it doesn't
1058 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1059 * mistake.
1060 */
1061 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
1062 unsigned long orig_i0, int restart_syscall)
1063 {
1064 siginfo_t info;
1065 struct sparc_deliver_cookie cookie;
1066 int signr;
1067
1068 /*
1069 * XXX Disable svr4 signal handling until solaris emulation works.
1070 * It is buggy - Anton
1071 */
1072 #define SVR4_SIGNAL_BROKEN 1
1073 #ifdef SVR4_SIGNAL_BROKEN
1074 int svr4_signal = 0;
1075 #else
1076 int svr4_signal = current->personality == PER_SVR4;
1077 #endif
1078
1079 cookie.restart_syscall = restart_syscall;
1080 cookie.orig_i0 = orig_i0;
1081
1082 if (!oldset)
1083 oldset = ¤t->blocked;
1084
1085 signr = get_signal_to_deliver(&info, regs, &cookie);
1086 if (signr > 0) {
1087 struct k_sigaction *ka;
1088
1089 ka = ¤t->sighand->action[signr-1];
1090
1091 if (cookie.restart_syscall)
1092 syscall_restart(cookie.orig_i0, regs, &ka->sa);
1093 handle_signal(signr, ka, &info, oldset, regs, svr4_signal);
1094 return 1;
1095 }
1096 if (cookie.restart_syscall &&
1097 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1098 regs->u_regs[UREG_I0] == ERESTARTSYS ||
1099 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1100 /* replay the system call when we are done */
1101 regs->u_regs[UREG_I0] = cookie.orig_i0;
1102 regs->pc -= 4;
1103 regs->npc -= 4;
1104 }
1105 if (cookie.restart_syscall &&
1106 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1107 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1108 regs->pc -= 4;
1109 regs->npc -= 4;
1110 }
1111 return 0;
1112 }
1113
1114 asmlinkage int
1115 do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
1116 unsigned long sp)
1117 {
1118 int ret = -EFAULT;
1119
1120 /* First see if old state is wanted. */
1121 if (ossptr) {
1122 if (put_user(current->sas_ss_sp + current->sas_ss_size,
1123 &ossptr->the_stack) ||
1124 __put_user(on_sig_stack(sp), &ossptr->cur_status))
1125 goto out;
1126 }
1127
1128 /* Now see if we want to update the new state. */
1129 if (ssptr) {
1130 void *ss_sp;
1131
1132 if (get_user((long)ss_sp, &ssptr->the_stack))
1133 goto out;
1134 /* If the current stack was set with sigaltstack, don't
1135 swap stacks while we are on it. */
1136 ret = -EPERM;
1137 if (current->sas_ss_sp && on_sig_stack(sp))
1138 goto out;
1139
1140 /* Since we don't know the extent of the stack, and we don't
1141 track onstack-ness, but rather calculate it, we must
1142 presume a size. Ho hum this interface is lossy. */
1143 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
1144 current->sas_ss_size = SIGSTKSZ;
1145 }
1146 ret = 0;
1147 out:
1148 return ret;
1149 }
1150
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