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[mirror_ubuntu-artful-kernel.git] / arch / sparc / kernel / signal.c
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 #include <linux/bitops.h>
24
25 #include <asm/uaccess.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(&current->sighand->siglock);
108 saveset = current->blocked;
109 siginitset(&current->blocked, set);
110 recalc_sigpending();
111 spin_unlock_irq(&current->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(&current->sighand->siglock);
165 oldset = current->blocked;
166 current->blocked = set;
167 recalc_sigpending();
168 spin_unlock_irq(&current->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 = NULL;
202 regs->psr &= ~PSR_EF;
203 }
204 #endif
205 set_used_math();
206 clear_tsk_thread_flag(current, TIF_USEDFPU);
207
208 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
209 return -EFAULT;
210
211 err = __copy_from_user(&current->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(&current->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 (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
235 goto segv_and_exit;
236
237 if (((unsigned long) 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(&current->sighand->siglock);
271 current->blocked = set;
272 recalc_sigpending();
273 spin_unlock_irq(&current->sighand->siglock);
274 return;
275
276 segv_and_exit:
277 force_sig(SIGSEGV, current);
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 do_new_sigreturn(regs);
294 return;
295 }
296
297 scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
298
299 /* Check sanity of the user arg. */
300 if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
301 (((unsigned long) scptr) & 3))
302 goto segv_and_exit;
303
304 err = __get_user(pc, &scptr->sigc_pc);
305 err |= __get_user(npc, &scptr->sigc_npc);
306
307 if ((pc | npc) & 3)
308 goto segv_and_exit;
309
310 /* This is pretty much atomic, no amount locking would prevent
311 * the races which exist anyways.
312 */
313 err |= __get_user(set.sig[0], &scptr->sigc_mask);
314 /* Note that scptr + 1 points to extramask */
315 err |= __copy_from_user(&set.sig[1], scptr + 1,
316 (_NSIG_WORDS - 1) * sizeof(unsigned int));
317
318 if (err)
319 goto segv_and_exit;
320
321 sigdelsetmask(&set, ~_BLOCKABLE);
322 spin_lock_irq(&current->sighand->siglock);
323 current->blocked = set;
324 recalc_sigpending();
325 spin_unlock_irq(&current->sighand->siglock);
326
327 regs->pc = pc;
328 regs->npc = npc;
329
330 err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
331 err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
332 err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
333
334 /* User can only change condition codes in %psr. */
335 err |= __get_user(psr, &scptr->sigc_psr);
336 if (err)
337 goto segv_and_exit;
338
339 regs->psr &= ~(PSR_ICC);
340 regs->psr |= (psr & PSR_ICC);
341 return;
342
343 segv_and_exit:
344 force_sig(SIGSEGV, current);
345 }
346
347 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
348 {
349 struct rt_signal_frame __user *sf;
350 unsigned int psr, pc, npc;
351 __siginfo_fpu_t __user *fpu_save;
352 mm_segment_t old_fs;
353 sigset_t set;
354 stack_t st;
355 int err;
356
357 synchronize_user_stack();
358 sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
359 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
360 (((unsigned long) sf) & 0x03))
361 goto segv;
362
363 err = __get_user(pc, &sf->regs.pc);
364 err |= __get_user(npc, &sf->regs.npc);
365 err |= ((pc | npc) & 0x03);
366
367 err |= __get_user(regs->y, &sf->regs.y);
368 err |= __get_user(psr, &sf->regs.psr);
369
370 err |= __copy_from_user(&regs->u_regs[UREG_G1],
371 &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
372
373 regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
374
375 err |= __get_user(fpu_save, &sf->fpu_save);
376
377 if (fpu_save)
378 err |= restore_fpu_state(regs, fpu_save);
379 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
380
381 err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
382
383 if (err)
384 goto segv;
385
386 regs->pc = pc;
387 regs->npc = npc;
388
389 /* It is more difficult to avoid calling this function than to
390 * call it and ignore errors.
391 */
392 old_fs = get_fs();
393 set_fs(KERNEL_DS);
394 do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
395 set_fs(old_fs);
396
397 sigdelsetmask(&set, ~_BLOCKABLE);
398 spin_lock_irq(&current->sighand->siglock);
399 current->blocked = set;
400 recalc_sigpending();
401 spin_unlock_irq(&current->sighand->siglock);
402 return;
403 segv:
404 force_sig(SIGSEGV, current);
405 }
406
407 /* Checks if the fp is valid */
408 static inline int invalid_frame_pointer(void __user *fp, int fplen)
409 {
410 if ((((unsigned long) fp) & 7) ||
411 !__access_ok((unsigned long)fp, fplen) ||
412 ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
413 ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
414 return 1;
415
416 return 0;
417 }
418
419 static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
420 {
421 unsigned long sp;
422
423 sp = regs->u_regs[UREG_FP];
424
425 /* This is the X/Open sanctioned signal stack switching. */
426 if (sa->sa_flags & SA_ONSTACK) {
427 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
428 sp = current->sas_ss_sp + current->sas_ss_size;
429 }
430 return (void __user *)(sp - framesize);
431 }
432
433 static inline void
434 setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
435 {
436 struct signal_sframe __user *sframep;
437 struct sigcontext __user *sc;
438 int window = 0, err;
439 unsigned long pc = regs->pc;
440 unsigned long npc = regs->npc;
441 struct thread_info *tp = current_thread_info();
442 void __user *sig_address;
443 int sig_code;
444
445 synchronize_user_stack();
446 sframep = (struct signal_sframe __user *)
447 get_sigframe(sa, regs, SF_ALIGNEDSZ);
448 if (invalid_frame_pointer(sframep, sizeof(*sframep))){
449 /* Don't change signal code and address, so that
450 * post mortem debuggers can have a look.
451 */
452 goto sigill_and_return;
453 }
454
455 sc = &sframep->sig_context;
456
457 /* We've already made sure frame pointer isn't in kernel space... */
458 err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
459 &sc->sigc_onstack);
460 err |= __put_user(oldset->sig[0], &sc->sigc_mask);
461 err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
462 (_NSIG_WORDS - 1) * sizeof(unsigned int));
463 err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
464 err |= __put_user(pc, &sc->sigc_pc);
465 err |= __put_user(npc, &sc->sigc_npc);
466 err |= __put_user(regs->psr, &sc->sigc_psr);
467 err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
468 err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
469 err |= __put_user(tp->w_saved, &sc->sigc_oswins);
470 if (tp->w_saved)
471 for (window = 0; window < tp->w_saved; window++) {
472 put_user((char *)tp->rwbuf_stkptrs[window],
473 &sc->sigc_spbuf[window]);
474 err |= __copy_to_user(&sc->sigc_wbuf[window],
475 &tp->reg_window[window],
476 sizeof(struct reg_window));
477 }
478 else
479 err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
480 sizeof(struct reg_window));
481
482 tp->w_saved = 0; /* So process is allowed to execute. */
483
484 err |= __put_user(signr, &sframep->sig_num);
485 sig_address = NULL;
486 sig_code = 0;
487 if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
488 sig_address = info->si_addr;
489 switch (signr) {
490 case SIGSEGV:
491 switch (info->si_code) {
492 case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
493 default: sig_code = SUBSIG_PROTECTION; break;
494 }
495 break;
496 case SIGILL:
497 switch (info->si_code) {
498 case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
499 case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
500 case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
501 default: sig_code = SUBSIG_STACK; break;
502 }
503 break;
504 case SIGFPE:
505 switch (info->si_code) {
506 case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
507 case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
508 case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
509 case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
510 case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
511 case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
512 case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
513 default: sig_code = SUBSIG_FPERROR; break;
514 }
515 break;
516 case SIGBUS:
517 switch (info->si_code) {
518 case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
519 case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
520 default: sig_code = SUBSIG_BUSTIMEOUT; break;
521 }
522 break;
523 case SIGEMT:
524 switch (info->si_code) {
525 case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
526 }
527 break;
528 case SIGSYS:
529 if (info->si_code == (__SI_FAULT|0x100)) {
530 /* See sys_sunos.c */
531 sig_code = info->si_trapno;
532 break;
533 }
534 default:
535 sig_address = NULL;
536 }
537 }
538 err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
539 err |= __put_user(sig_code, &sframep->sig_code);
540 err |= __put_user(sc, &sframep->sig_scptr);
541 if (err)
542 goto sigsegv;
543
544 regs->u_regs[UREG_FP] = (unsigned long) sframep;
545 regs->pc = (unsigned long) sa->sa_handler;
546 regs->npc = (regs->pc + 4);
547 return;
548
549 sigill_and_return:
550 do_exit(SIGILL);
551 sigsegv:
552 force_sigsegv(signr, current);
553 }
554
555
556 static inline int
557 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
558 {
559 int err = 0;
560 #ifdef CONFIG_SMP
561 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
562 put_psr(get_psr() | PSR_EF);
563 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
564 &current->thread.fpqueue[0], &current->thread.fpqdepth);
565 regs->psr &= ~(PSR_EF);
566 clear_tsk_thread_flag(current, TIF_USEDFPU);
567 }
568 #else
569 if (current == last_task_used_math) {
570 put_psr(get_psr() | PSR_EF);
571 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
572 &current->thread.fpqueue[0], &current->thread.fpqdepth);
573 last_task_used_math = NULL;
574 regs->psr &= ~(PSR_EF);
575 }
576 #endif
577 err |= __copy_to_user(&fpu->si_float_regs[0],
578 &current->thread.float_regs[0],
579 (sizeof(unsigned long) * 32));
580 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
581 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
582 if (current->thread.fpqdepth != 0)
583 err |= __copy_to_user(&fpu->si_fpqueue[0],
584 &current->thread.fpqueue[0],
585 ((sizeof(unsigned long) +
586 (sizeof(unsigned long *)))*16));
587 clear_used_math();
588 return err;
589 }
590
591 static inline void
592 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
593 int signo, sigset_t *oldset)
594 {
595 struct new_signal_frame __user *sf;
596 int sigframe_size, err;
597
598 /* 1. Make sure everything is clean */
599 synchronize_user_stack();
600
601 sigframe_size = NF_ALIGNEDSZ;
602 if (!used_math())
603 sigframe_size -= sizeof(__siginfo_fpu_t);
604
605 sf = (struct new_signal_frame __user *)
606 get_sigframe(&ka->sa, regs, sigframe_size);
607
608 if (invalid_frame_pointer(sf, sigframe_size))
609 goto sigill_and_return;
610
611 if (current_thread_info()->w_saved != 0)
612 goto sigill_and_return;
613
614 /* 2. Save the current process state */
615 err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
616
617 err |= __put_user(0, &sf->extra_size);
618
619 if (used_math()) {
620 err |= save_fpu_state(regs, &sf->fpu_state);
621 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
622 } else {
623 err |= __put_user(0, &sf->fpu_save);
624 }
625
626 err |= __put_user(oldset->sig[0], &sf->info.si_mask);
627 err |= __copy_to_user(sf->extramask, &oldset->sig[1],
628 (_NSIG_WORDS - 1) * sizeof(unsigned int));
629 err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
630 sizeof(struct reg_window));
631 if (err)
632 goto sigsegv;
633
634 /* 3. signal handler back-trampoline and parameters */
635 regs->u_regs[UREG_FP] = (unsigned long) sf;
636 regs->u_regs[UREG_I0] = signo;
637 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
638 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
639
640 /* 4. signal handler */
641 regs->pc = (unsigned long) ka->sa.sa_handler;
642 regs->npc = (regs->pc + 4);
643
644 /* 5. return to kernel instructions */
645 if (ka->ka_restorer)
646 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
647 else {
648 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
649
650 /* mov __NR_sigreturn, %g1 */
651 err |= __put_user(0x821020d8, &sf->insns[0]);
652
653 /* t 0x10 */
654 err |= __put_user(0x91d02010, &sf->insns[1]);
655 if (err)
656 goto sigsegv;
657
658 /* Flush instruction space. */
659 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
660 }
661 return;
662
663 sigill_and_return:
664 do_exit(SIGILL);
665 sigsegv:
666 force_sigsegv(signo, current);
667 }
668
669 static inline void
670 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
671 int signo, sigset_t *oldset, siginfo_t *info)
672 {
673 struct rt_signal_frame __user *sf;
674 int sigframe_size;
675 unsigned int psr;
676 int err;
677
678 synchronize_user_stack();
679 sigframe_size = RT_ALIGNEDSZ;
680 if (!used_math())
681 sigframe_size -= sizeof(__siginfo_fpu_t);
682 sf = (struct rt_signal_frame __user *)
683 get_sigframe(&ka->sa, regs, sigframe_size);
684 if (invalid_frame_pointer(sf, sigframe_size))
685 goto sigill;
686 if (current_thread_info()->w_saved != 0)
687 goto sigill;
688
689 err = __put_user(regs->pc, &sf->regs.pc);
690 err |= __put_user(regs->npc, &sf->regs.npc);
691 err |= __put_user(regs->y, &sf->regs.y);
692 psr = regs->psr;
693 if (used_math())
694 psr |= PSR_EF;
695 err |= __put_user(psr, &sf->regs.psr);
696 err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
697 err |= __put_user(0, &sf->extra_size);
698
699 if (psr & PSR_EF) {
700 err |= save_fpu_state(regs, &sf->fpu_state);
701 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
702 } else {
703 err |= __put_user(0, &sf->fpu_save);
704 }
705 err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
706
707 /* Setup sigaltstack */
708 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
709 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
710 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
711
712 err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
713 sizeof(struct reg_window));
714
715 err |= copy_siginfo_to_user(&sf->info, info);
716
717 if (err)
718 goto sigsegv;
719
720 regs->u_regs[UREG_FP] = (unsigned long) sf;
721 regs->u_regs[UREG_I0] = signo;
722 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
723 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
724
725 regs->pc = (unsigned long) ka->sa.sa_handler;
726 regs->npc = (regs->pc + 4);
727
728 if (ka->ka_restorer)
729 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
730 else {
731 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
732
733 /* mov __NR_sigreturn, %g1 */
734 err |= __put_user(0x821020d8, &sf->insns[0]);
735
736 /* t 0x10 */
737 err |= __put_user(0x91d02010, &sf->insns[1]);
738 if (err)
739 goto sigsegv;
740
741 /* Flush instruction space. */
742 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
743 }
744 return;
745
746 sigill:
747 do_exit(SIGILL);
748 sigsegv:
749 force_sigsegv(signo, current);
750 }
751
752 /* Setup a Solaris stack frame */
753 static inline void
754 setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
755 struct pt_regs *regs, int signr, sigset_t *oldset)
756 {
757 svr4_signal_frame_t __user *sfp;
758 svr4_gregset_t __user *gr;
759 svr4_siginfo_t __user *si;
760 svr4_mcontext_t __user *mc;
761 svr4_gwindows_t __user *gw;
762 svr4_ucontext_t __user *uc;
763 svr4_sigset_t setv;
764 struct thread_info *tp = current_thread_info();
765 int window = 0, err;
766
767 synchronize_user_stack();
768 sfp = (svr4_signal_frame_t __user *)
769 get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window));
770
771 if (invalid_frame_pointer(sfp, sizeof(*sfp)))
772 goto sigill_and_return;
773
774 /* Start with a clean frame pointer and fill it */
775 err = __clear_user(sfp, sizeof(*sfp));
776
777 /* Setup convenience variables */
778 si = &sfp->si;
779 uc = &sfp->uc;
780 gw = &sfp->gw;
781 mc = &uc->mcontext;
782 gr = &mc->greg;
783
784 /* FIXME: where am I supposed to put this?
785 * sc->sigc_onstack = old_status;
786 * anyways, it does not look like it is used for anything at all.
787 */
788 setv.sigbits[0] = oldset->sig[0];
789 setv.sigbits[1] = oldset->sig[1];
790 if (_NSIG_WORDS >= 4) {
791 setv.sigbits[2] = oldset->sig[2];
792 setv.sigbits[3] = oldset->sig[3];
793 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
794 } else
795 err |= __copy_to_user(&uc->sigmask, &setv,
796 2 * sizeof(unsigned int));
797
798 /* Store registers */
799 err |= __put_user(regs->pc, &((*gr)[SVR4_PC]));
800 err |= __put_user(regs->npc, &((*gr)[SVR4_NPC]));
801 err |= __put_user(regs->psr, &((*gr)[SVR4_PSR]));
802 err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
803
804 /* Copy g[1..7] and o[0..7] registers */
805 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
806 sizeof(long) * 7);
807 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
808 sizeof(long) * 8);
809
810 /* Setup sigaltstack */
811 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
812 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
813 err |= __put_user(current->sas_ss_size, &uc->stack.size);
814
815 /* Save the currently window file: */
816
817 /* 1. Link sfp->uc->gwins to our windows */
818 err |= __put_user(gw, &mc->gwin);
819
820 /* 2. Number of windows to restore at setcontext(): */
821 err |= __put_user(tp->w_saved, &gw->count);
822
823 /* 3. Save each valid window
824 * Currently, it makes a copy of the windows from the kernel copy.
825 * David's code for SunOS, makes the copy but keeps the pointer to
826 * the kernel. My version makes the pointer point to a userland
827 * copy of those. Mhm, I wonder if I shouldn't just ignore those
828 * on setcontext and use those that are on the kernel, the signal
829 * handler should not be modyfing those, mhm.
830 *
831 * These windows are just used in case synchronize_user_stack failed
832 * to flush the user windows.
833 */
834 for (window = 0; window < tp->w_saved; window++) {
835 err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]);
836 err |= __copy_to_user(&gw->win[window],
837 &tp->reg_window[window],
838 sizeof(svr4_rwindow_t));
839 err |= __put_user(0, gw->winptr[window]);
840 }
841
842 /* 4. We just pay attention to the gw->count field on setcontext */
843 tp->w_saved = 0; /* So process is allowed to execute. */
844
845 /* Setup the signal information. Solaris expects a bunch of
846 * information to be passed to the signal handler, we don't provide
847 * that much currently, should use siginfo.
848 */
849 err |= __put_user(signr, &si->siginfo.signo);
850 err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
851 if (err)
852 goto sigsegv;
853
854 regs->u_regs[UREG_FP] = (unsigned long) sfp;
855 regs->pc = (unsigned long) sa->sa_handler;
856 regs->npc = (regs->pc + 4);
857
858 /* Arguments passed to signal handler */
859 if (regs->u_regs[14]){
860 struct reg_window __user *rw = (struct reg_window __user *)
861 regs->u_regs[14];
862
863 err |= __put_user(signr, &rw->ins[0]);
864 err |= __put_user(si, &rw->ins[1]);
865 err |= __put_user(uc, &rw->ins[2]);
866 err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */
867 if (err)
868 goto sigsegv;
869
870 regs->u_regs[UREG_I0] = signr;
871 regs->u_regs[UREG_I1] = (unsigned long) si;
872 regs->u_regs[UREG_I2] = (unsigned long) uc;
873 }
874 return;
875
876 sigill_and_return:
877 do_exit(SIGILL);
878 sigsegv:
879 force_sigsegv(signr, current);
880 }
881
882 asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
883 {
884 svr4_gregset_t __user *gr;
885 svr4_mcontext_t __user *mc;
886 svr4_sigset_t setv;
887 int err = 0;
888
889 synchronize_user_stack();
890
891 if (current_thread_info()->w_saved)
892 return -EFAULT;
893
894 err = clear_user(uc, sizeof(*uc));
895 if (err)
896 return -EFAULT;
897
898 /* Setup convenience variables */
899 mc = &uc->mcontext;
900 gr = &mc->greg;
901
902 setv.sigbits[0] = current->blocked.sig[0];
903 setv.sigbits[1] = current->blocked.sig[1];
904 if (_NSIG_WORDS >= 4) {
905 setv.sigbits[2] = current->blocked.sig[2];
906 setv.sigbits[3] = current->blocked.sig[3];
907 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
908 } else
909 err |= __copy_to_user(&uc->sigmask, &setv,
910 2 * sizeof(unsigned int));
911
912 /* Store registers */
913 err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]);
914 err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]);
915 err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]);
916 err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
917
918 /* Copy g[1..7] and o[0..7] registers */
919 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
920 sizeof(uint) * 7);
921 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
922 sizeof(uint) * 8);
923
924 /* Setup sigaltstack */
925 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
926 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
927 err |= __put_user(current->sas_ss_size, &uc->stack.size);
928
929 /* The register file is not saved
930 * we have already stuffed all of it with sync_user_stack
931 */
932 return (err ? -EFAULT : 0);
933 }
934
935 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
936 asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
937 {
938 svr4_gregset_t __user *gr;
939 unsigned long pc, npc, psr;
940 mm_segment_t old_fs;
941 sigset_t set;
942 svr4_sigset_t setv;
943 int err;
944 stack_t st;
945
946 /* Fixme: restore windows, or is this already taken care of in
947 * svr4_setup_frame when sync_user_windows is done?
948 */
949 flush_user_windows();
950
951 if (current_thread_info()->w_saved)
952 goto sigsegv_and_return;
953
954 if (((unsigned long) c) & 3)
955 goto sigsegv_and_return;
956
957 if (!__access_ok((unsigned long)c, sizeof(*c)))
958 goto sigsegv_and_return;
959
960 /* Check for valid PC and nPC */
961 gr = &c->mcontext.greg;
962 err = __get_user(pc, &((*gr)[SVR4_PC]));
963 err |= __get_user(npc, &((*gr)[SVR4_NPC]));
964
965 if ((pc | npc) & 3)
966 goto sigsegv_and_return;
967
968 /* Retrieve information from passed ucontext */
969 /* note that nPC is ored a 1, this is used to inform entry.S */
970 /* that we don't want it to mess with our PC and nPC */
971
972 /* This is pretty much atomic, no amount locking would prevent
973 * the races which exist anyways.
974 */
975 err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
976
977 err |= __get_user(st.ss_sp, &c->stack.sp);
978 err |= __get_user(st.ss_flags, &c->stack.flags);
979 err |= __get_user(st.ss_size, &c->stack.size);
980
981 if (err)
982 goto sigsegv_and_return;
983
984 /* It is more difficult to avoid calling this function than to
985 call it and ignore errors. */
986 old_fs = get_fs();
987 set_fs(KERNEL_DS);
988 do_sigaltstack((const stack_t __user *) &st, NULL,
989 regs->u_regs[UREG_I6]);
990 set_fs(old_fs);
991
992 set.sig[0] = setv.sigbits[0];
993 set.sig[1] = setv.sigbits[1];
994 if (_NSIG_WORDS >= 4) {
995 set.sig[2] = setv.sigbits[2];
996 set.sig[3] = setv.sigbits[3];
997 }
998 sigdelsetmask(&set, ~_BLOCKABLE);
999 spin_lock_irq(&current->sighand->siglock);
1000 current->blocked = set;
1001 recalc_sigpending();
1002 spin_unlock_irq(&current->sighand->siglock);
1003 regs->pc = pc;
1004 regs->npc = npc | 1;
1005 err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
1006 err |= __get_user(psr, &((*gr)[SVR4_PSR]));
1007 regs->psr &= ~(PSR_ICC);
1008 regs->psr |= (psr & PSR_ICC);
1009
1010 /* Restore g[1..7] and o[0..7] registers */
1011 err |= __copy_from_user(&regs->u_regs[UREG_G1], &(*gr)[SVR4_G1],
1012 sizeof(long) * 7);
1013 err |= __copy_from_user(&regs->u_regs[UREG_I0], &(*gr)[SVR4_O0],
1014 sizeof(long) * 8);
1015 return (err ? -EFAULT : 0);
1016
1017 sigsegv_and_return:
1018 force_sig(SIGSEGV, current);
1019 return -EFAULT;
1020 }
1021
1022 static inline void
1023 handle_signal(unsigned long signr, struct k_sigaction *ka,
1024 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
1025 int svr4_signal)
1026 {
1027 if (svr4_signal)
1028 setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
1029 else {
1030 if (ka->sa.sa_flags & SA_SIGINFO)
1031 new_setup_rt_frame(ka, regs, signr, oldset, info);
1032 else if (current->thread.new_signal)
1033 new_setup_frame(ka, regs, signr, oldset);
1034 else
1035 setup_frame(&ka->sa, regs, signr, oldset, info);
1036 }
1037 if (!(ka->sa.sa_flags & SA_NOMASK)) {
1038 spin_lock_irq(&current->sighand->siglock);
1039 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
1040 sigaddset(&current->blocked, signr);
1041 recalc_sigpending();
1042 spin_unlock_irq(&current->sighand->siglock);
1043 }
1044 }
1045
1046 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
1047 struct sigaction *sa)
1048 {
1049 switch(regs->u_regs[UREG_I0]) {
1050 case ERESTART_RESTARTBLOCK:
1051 case ERESTARTNOHAND:
1052 no_system_call_restart:
1053 regs->u_regs[UREG_I0] = EINTR;
1054 regs->psr |= PSR_C;
1055 break;
1056 case ERESTARTSYS:
1057 if (!(sa->sa_flags & SA_RESTART))
1058 goto no_system_call_restart;
1059 /* fallthrough */
1060 case ERESTARTNOINTR:
1061 regs->u_regs[UREG_I0] = orig_i0;
1062 regs->pc -= 4;
1063 regs->npc -= 4;
1064 }
1065 }
1066
1067 /* Note that 'init' is a special process: it doesn't get signals it doesn't
1068 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1069 * mistake.
1070 */
1071 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
1072 unsigned long orig_i0, int restart_syscall)
1073 {
1074 siginfo_t info;
1075 struct sparc_deliver_cookie cookie;
1076 struct k_sigaction ka;
1077 int signr;
1078
1079 /*
1080 * XXX Disable svr4 signal handling until solaris emulation works.
1081 * It is buggy - Anton
1082 */
1083 #define SVR4_SIGNAL_BROKEN 1
1084 #ifdef SVR4_SIGNAL_BROKEN
1085 int svr4_signal = 0;
1086 #else
1087 int svr4_signal = current->personality == PER_SVR4;
1088 #endif
1089
1090 cookie.restart_syscall = restart_syscall;
1091 cookie.orig_i0 = orig_i0;
1092
1093 if (!oldset)
1094 oldset = &current->blocked;
1095
1096 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
1097 if (signr > 0) {
1098 if (cookie.restart_syscall)
1099 syscall_restart(cookie.orig_i0, regs, &ka.sa);
1100 handle_signal(signr, &ka, &info, oldset,
1101 regs, svr4_signal);
1102 return 1;
1103 }
1104 if (cookie.restart_syscall &&
1105 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1106 regs->u_regs[UREG_I0] == ERESTARTSYS ||
1107 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1108 /* replay the system call when we are done */
1109 regs->u_regs[UREG_I0] = cookie.orig_i0;
1110 regs->pc -= 4;
1111 regs->npc -= 4;
1112 }
1113 if (cookie.restart_syscall &&
1114 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1115 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1116 regs->pc -= 4;
1117 regs->npc -= 4;
1118 }
1119 return 0;
1120 }
1121
1122 asmlinkage int
1123 do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
1124 unsigned long sp)
1125 {
1126 int ret = -EFAULT;
1127
1128 /* First see if old state is wanted. */
1129 if (ossptr) {
1130 if (put_user(current->sas_ss_sp + current->sas_ss_size,
1131 &ossptr->the_stack) ||
1132 __put_user(on_sig_stack(sp), &ossptr->cur_status))
1133 goto out;
1134 }
1135
1136 /* Now see if we want to update the new state. */
1137 if (ssptr) {
1138 char *ss_sp;
1139
1140 if (get_user(ss_sp, &ssptr->the_stack))
1141 goto out;
1142 /* If the current stack was set with sigaltstack, don't
1143 swap stacks while we are on it. */
1144 ret = -EPERM;
1145 if (current->sas_ss_sp && on_sig_stack(sp))
1146 goto out;
1147
1148 /* Since we don't know the extent of the stack, and we don't
1149 track onstack-ness, but rather calculate it, we must
1150 presume a size. Ho hum this interface is lossy. */
1151 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
1152 current->sas_ss_size = SIGSTKSZ;
1153 }
1154 ret = 0;
1155 out:
1156 return ret;
1157 }
1158
1159 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
1160 {
1161 struct sparc_deliver_cookie *cp = cookie;
1162
1163 if (cp->restart_syscall &&
1164 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1165 regs->u_regs[UREG_I0] == ERESTARTSYS ||
1166 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1167 /* replay the system call when we are done */
1168 regs->u_regs[UREG_I0] = cp->orig_i0;
1169 regs->pc -= 4;
1170 regs->npc -= 4;
1171 cp->restart_syscall = 0;
1172 }
1173
1174 if (cp->restart_syscall &&
1175 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1176 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1177 regs->pc -= 4;
1178 regs->npc -= 4;
1179 cp->restart_syscall = 0;
1180 }
1181 }
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