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kbuild: Fix instrumentation removal breakage on avr32
[wrt350n-kernel.git] / arch / sparc / kernel / signal.c
blob9994cac950789a265d8c1db23b010c228adefa98
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/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/tty.h>
19 #include <linux/smp.h>
20 #include <linux/binfmts.h> /* do_coredum */
21 #include <linux/bitops.h>
22
23 #include <asm/uaccess.h>
24 #include <asm/ptrace.h>
25 #include <asm/svr4.h>
26 #include <asm/pgalloc.h>
27 #include <asm/pgtable.h>
28 #include <asm/cacheflush.h> /* flush_sig_insns */
29
30 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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 /* Signal frames: the original one (compatible with SunOS):
37 *
38 * Set up a signal frame... Make the stack look the way SunOS
39 * expects it to look which is basically:
40 *
41 * ---------------------------------- <-- %sp at signal time
42 * Struct sigcontext
43 * Signal address
44 * Ptr to sigcontext area above
45 * Signal code
46 * The signal number itself
47 * One register window
48 * ---------------------------------- <-- New %sp
49 */
50 struct signal_sframe {
51 struct reg_window sig_window;
52 int sig_num;
53 int sig_code;
54 struct sigcontext __user *sig_scptr;
55 int sig_address;
56 struct sigcontext sig_context;
57 unsigned int extramask[_NSIG_WORDS - 1];
58 };
59
60 /*
61 * And the new one, intended to be used for Linux applications only
62 * (we have enough in there to work with clone).
63 * All the interesting bits are in the info field.
64 */
65
66 struct new_signal_frame {
67 struct sparc_stackf ss;
68 __siginfo_t info;
69 __siginfo_fpu_t __user *fpu_save;
70 unsigned long insns[2] __attribute__ ((aligned (8)));
71 unsigned int extramask[_NSIG_WORDS - 1];
72 unsigned int extra_size; /* Should be 0 */
73 __siginfo_fpu_t fpu_state;
74 };
75
76 struct rt_signal_frame {
77 struct sparc_stackf ss;
78 siginfo_t info;
79 struct pt_regs regs;
80 sigset_t mask;
81 __siginfo_fpu_t __user *fpu_save;
82 unsigned int insns[2];
83 stack_t stack;
84 unsigned int extra_size; /* Should be 0 */
85 __siginfo_fpu_t fpu_state;
86 };
87
88 /* Align macros */
89 #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7)))
90 #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7)))
91 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
92
93 static int _sigpause_common(old_sigset_t set)
94 {
95 set &= _BLOCKABLE;
96 spin_lock_irq(&current->sighand->siglock);
97 current->saved_sigmask = current->blocked;
98 siginitset(&current->blocked, set);
99 recalc_sigpending();
100 spin_unlock_irq(&current->sighand->siglock);
101
102 current->state = TASK_INTERRUPTIBLE;
103 schedule();
104 set_thread_flag(TIF_RESTORE_SIGMASK);
105
106 return -ERESTARTNOHAND;
107 }
108
109 asmlinkage int sys_sigpause(unsigned int set)
110 {
111 return _sigpause_common(set);
112 }
113
114 asmlinkage int sys_sigsuspend(old_sigset_t set)
115 {
116 return _sigpause_common(set);
117 }
118
119 static inline int
120 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
121 {
122 int err;
123 #ifdef CONFIG_SMP
124 if (test_tsk_thread_flag(current, TIF_USEDFPU))
125 regs->psr &= ~PSR_EF;
126 #else
127 if (current == last_task_used_math) {
128 last_task_used_math = NULL;
129 regs->psr &= ~PSR_EF;
130 }
131 #endif
132 set_used_math();
133 clear_tsk_thread_flag(current, TIF_USEDFPU);
134
135 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
136 return -EFAULT;
137
138 err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
139 (sizeof(unsigned long) * 32));
140 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
141 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
142 if (current->thread.fpqdepth != 0)
143 err |= __copy_from_user(&current->thread.fpqueue[0],
144 &fpu->si_fpqueue[0],
145 ((sizeof(unsigned long) +
146 (sizeof(unsigned long *)))*16));
147 return err;
148 }
149
150 static inline void do_new_sigreturn (struct pt_regs *regs)
151 {
152 struct new_signal_frame __user *sf;
153 unsigned long up_psr, pc, npc;
154 sigset_t set;
155 __siginfo_fpu_t __user *fpu_save;
156 int err;
157
158 sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP];
159
160 /* 1. Make sure we are not getting garbage from the user */
161 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
162 goto segv_and_exit;
163
164 if (((unsigned long) sf) & 3)
165 goto segv_and_exit;
166
167 err = __get_user(pc, &sf->info.si_regs.pc);
168 err |= __get_user(npc, &sf->info.si_regs.npc);
169
170 if ((pc | npc) & 3)
171 goto segv_and_exit;
172
173 /* 2. Restore the state */
174 up_psr = regs->psr;
175 err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
176
177 /* User can only change condition codes and FPU enabling in %psr. */
178 regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
179 | (regs->psr & (PSR_ICC | PSR_EF));
180
181 err |= __get_user(fpu_save, &sf->fpu_save);
182
183 if (fpu_save)
184 err |= restore_fpu_state(regs, fpu_save);
185
186 /* This is pretty much atomic, no amount locking would prevent
187 * the races which exist anyways.
188 */
189 err |= __get_user(set.sig[0], &sf->info.si_mask);
190 err |= __copy_from_user(&set.sig[1], &sf->extramask,
191 (_NSIG_WORDS-1) * sizeof(unsigned int));
192
193 if (err)
194 goto segv_and_exit;
195
196 sigdelsetmask(&set, ~_BLOCKABLE);
197 spin_lock_irq(&current->sighand->siglock);
198 current->blocked = set;
199 recalc_sigpending();
200 spin_unlock_irq(&current->sighand->siglock);
201 return;
202
203 segv_and_exit:
204 force_sig(SIGSEGV, current);
205 }
206
207 asmlinkage void do_sigreturn(struct pt_regs *regs)
208 {
209 struct sigcontext __user *scptr;
210 unsigned long pc, npc, psr;
211 sigset_t set;
212 int err;
213
214 /* Always make any pending restarted system calls return -EINTR */
215 current_thread_info()->restart_block.fn = do_no_restart_syscall;
216
217 synchronize_user_stack();
218
219 if (current->thread.new_signal) {
220 do_new_sigreturn(regs);
221 return;
222 }
223
224 scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
225
226 /* Check sanity of the user arg. */
227 if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
228 (((unsigned long) scptr) & 3))
229 goto segv_and_exit;
230
231 err = __get_user(pc, &scptr->sigc_pc);
232 err |= __get_user(npc, &scptr->sigc_npc);
233
234 if ((pc | npc) & 3)
235 goto segv_and_exit;
236
237 /* This is pretty much atomic, no amount locking would prevent
238 * the races which exist anyways.
239 */
240 err |= __get_user(set.sig[0], &scptr->sigc_mask);
241 /* Note that scptr + 1 points to extramask */
242 err |= __copy_from_user(&set.sig[1], scptr + 1,
243 (_NSIG_WORDS - 1) * sizeof(unsigned int));
244
245 if (err)
246 goto segv_and_exit;
247
248 sigdelsetmask(&set, ~_BLOCKABLE);
249 spin_lock_irq(&current->sighand->siglock);
250 current->blocked = set;
251 recalc_sigpending();
252 spin_unlock_irq(&current->sighand->siglock);
253
254 regs->pc = pc;
255 regs->npc = npc;
256
257 err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
258 err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
259 err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
260
261 /* User can only change condition codes in %psr. */
262 err |= __get_user(psr, &scptr->sigc_psr);
263 if (err)
264 goto segv_and_exit;
265
266 regs->psr &= ~(PSR_ICC);
267 regs->psr |= (psr & PSR_ICC);
268 return;
269
270 segv_and_exit:
271 force_sig(SIGSEGV, current);
272 }
273
274 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
275 {
276 struct rt_signal_frame __user *sf;
277 unsigned int psr, pc, npc;
278 __siginfo_fpu_t __user *fpu_save;
279 mm_segment_t old_fs;
280 sigset_t set;
281 stack_t st;
282 int err;
283
284 synchronize_user_stack();
285 sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
286 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
287 (((unsigned long) sf) & 0x03))
288 goto segv;
289
290 err = __get_user(pc, &sf->regs.pc);
291 err |= __get_user(npc, &sf->regs.npc);
292 err |= ((pc | npc) & 0x03);
293
294 err |= __get_user(regs->y, &sf->regs.y);
295 err |= __get_user(psr, &sf->regs.psr);
296
297 err |= __copy_from_user(&regs->u_regs[UREG_G1],
298 &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
299
300 regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
301
302 err |= __get_user(fpu_save, &sf->fpu_save);
303
304 if (fpu_save)
305 err |= restore_fpu_state(regs, fpu_save);
306 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
307
308 err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
309
310 if (err)
311 goto segv;
312
313 regs->pc = pc;
314 regs->npc = npc;
315
316 /* It is more difficult to avoid calling this function than to
317 * call it and ignore errors.
318 */
319 old_fs = get_fs();
320 set_fs(KERNEL_DS);
321 do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
322 set_fs(old_fs);
323
324 sigdelsetmask(&set, ~_BLOCKABLE);
325 spin_lock_irq(&current->sighand->siglock);
326 current->blocked = set;
327 recalc_sigpending();
328 spin_unlock_irq(&current->sighand->siglock);
329 return;
330 segv:
331 force_sig(SIGSEGV, current);
332 }
333
334 /* Checks if the fp is valid */
335 static inline int invalid_frame_pointer(void __user *fp, int fplen)
336 {
337 if ((((unsigned long) fp) & 7) ||
338 !__access_ok((unsigned long)fp, fplen) ||
339 ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
340 ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
341 return 1;
342
343 return 0;
344 }
345
346 static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
347 {
348 unsigned long sp;
349
350 sp = regs->u_regs[UREG_FP];
351
352 /* This is the X/Open sanctioned signal stack switching. */
353 if (sa->sa_flags & SA_ONSTACK) {
354 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
355 sp = current->sas_ss_sp + current->sas_ss_size;
356 }
357 return (void __user *)(sp - framesize);
358 }
359
360 static inline void
361 setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
362 {
363 struct signal_sframe __user *sframep;
364 struct sigcontext __user *sc;
365 int window = 0, err;
366 unsigned long pc = regs->pc;
367 unsigned long npc = regs->npc;
368 struct thread_info *tp = current_thread_info();
369 void __user *sig_address;
370 int sig_code;
371
372 synchronize_user_stack();
373 sframep = (struct signal_sframe __user *)
374 get_sigframe(sa, regs, SF_ALIGNEDSZ);
375 if (invalid_frame_pointer(sframep, sizeof(*sframep))){
376 /* Don't change signal code and address, so that
377 * post mortem debuggers can have a look.
378 */
379 goto sigill_and_return;
380 }
381
382 sc = &sframep->sig_context;
383
384 /* We've already made sure frame pointer isn't in kernel space... */
385 err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
386 &sc->sigc_onstack);
387 err |= __put_user(oldset->sig[0], &sc->sigc_mask);
388 err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
389 (_NSIG_WORDS - 1) * sizeof(unsigned int));
390 err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
391 err |= __put_user(pc, &sc->sigc_pc);
392 err |= __put_user(npc, &sc->sigc_npc);
393 err |= __put_user(regs->psr, &sc->sigc_psr);
394 err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
395 err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
396 err |= __put_user(tp->w_saved, &sc->sigc_oswins);
397 if (tp->w_saved)
398 for (window = 0; window < tp->w_saved; window++) {
399 put_user((char *)tp->rwbuf_stkptrs[window],
400 &sc->sigc_spbuf[window]);
401 err |= __copy_to_user(&sc->sigc_wbuf[window],
402 &tp->reg_window[window],
403 sizeof(struct reg_window));
404 }
405 else
406 err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
407 sizeof(struct reg_window));
408
409 tp->w_saved = 0; /* So process is allowed to execute. */
410
411 err |= __put_user(signr, &sframep->sig_num);
412 sig_address = NULL;
413 sig_code = 0;
414 if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
415 sig_address = info->si_addr;
416 switch (signr) {
417 case SIGSEGV:
418 switch (info->si_code) {
419 case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
420 default: sig_code = SUBSIG_PROTECTION; break;
421 }
422 break;
423 case SIGILL:
424 switch (info->si_code) {
425 case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
426 case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
427 case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
428 default: sig_code = SUBSIG_STACK; break;
429 }
430 break;
431 case SIGFPE:
432 switch (info->si_code) {
433 case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
434 case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
435 case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
436 case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
437 case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
438 case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
439 case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
440 default: sig_code = SUBSIG_FPERROR; break;
441 }
442 break;
443 case SIGBUS:
444 switch (info->si_code) {
445 case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
446 case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
447 default: sig_code = SUBSIG_BUSTIMEOUT; break;
448 }
449 break;
450 case SIGEMT:
451 switch (info->si_code) {
452 case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
453 }
454 break;
455 case SIGSYS:
456 if (info->si_code == (__SI_FAULT|0x100)) {
457 /* See sys_sunos.c */
458 sig_code = info->si_trapno;
459 break;
460 }
461 default:
462 sig_address = NULL;
463 }
464 }
465 err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
466 err |= __put_user(sig_code, &sframep->sig_code);
467 err |= __put_user(sc, &sframep->sig_scptr);
468 if (err)
469 goto sigsegv;
470
471 regs->u_regs[UREG_FP] = (unsigned long) sframep;
472 regs->pc = (unsigned long) sa->sa_handler;
473 regs->npc = (regs->pc + 4);
474 return;
475
476 sigill_and_return:
477 do_exit(SIGILL);
478 sigsegv:
479 force_sigsegv(signr, current);
480 }
481
482
483 static inline int
484 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
485 {
486 int err = 0;
487 #ifdef CONFIG_SMP
488 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
489 put_psr(get_psr() | PSR_EF);
490 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
491 &current->thread.fpqueue[0], &current->thread.fpqdepth);
492 regs->psr &= ~(PSR_EF);
493 clear_tsk_thread_flag(current, TIF_USEDFPU);
494 }
495 #else
496 if (current == last_task_used_math) {
497 put_psr(get_psr() | PSR_EF);
498 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
499 &current->thread.fpqueue[0], &current->thread.fpqdepth);
500 last_task_used_math = NULL;
501 regs->psr &= ~(PSR_EF);
502 }
503 #endif
504 err |= __copy_to_user(&fpu->si_float_regs[0],
505 &current->thread.float_regs[0],
506 (sizeof(unsigned long) * 32));
507 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
508 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
509 if (current->thread.fpqdepth != 0)
510 err |= __copy_to_user(&fpu->si_fpqueue[0],
511 &current->thread.fpqueue[0],
512 ((sizeof(unsigned long) +
513 (sizeof(unsigned long *)))*16));
514 clear_used_math();
515 return err;
516 }
517
518 static inline void
519 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
520 int signo, sigset_t *oldset)
521 {
522 struct new_signal_frame __user *sf;
523 int sigframe_size, err;
524
525 /* 1. Make sure everything is clean */
526 synchronize_user_stack();
527
528 sigframe_size = NF_ALIGNEDSZ;
529 if (!used_math())
530 sigframe_size -= sizeof(__siginfo_fpu_t);
531
532 sf = (struct new_signal_frame __user *)
533 get_sigframe(&ka->sa, regs, sigframe_size);
534
535 if (invalid_frame_pointer(sf, sigframe_size))
536 goto sigill_and_return;
537
538 if (current_thread_info()->w_saved != 0)
539 goto sigill_and_return;
540
541 /* 2. Save the current process state */
542 err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
543
544 err |= __put_user(0, &sf->extra_size);
545
546 if (used_math()) {
547 err |= save_fpu_state(regs, &sf->fpu_state);
548 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
549 } else {
550 err |= __put_user(0, &sf->fpu_save);
551 }
552
553 err |= __put_user(oldset->sig[0], &sf->info.si_mask);
554 err |= __copy_to_user(sf->extramask, &oldset->sig[1],
555 (_NSIG_WORDS - 1) * sizeof(unsigned int));
556 err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
557 sizeof(struct reg_window));
558 if (err)
559 goto sigsegv;
560
561 /* 3. signal handler back-trampoline and parameters */
562 regs->u_regs[UREG_FP] = (unsigned long) sf;
563 regs->u_regs[UREG_I0] = signo;
564 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
565 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
566
567 /* 4. signal handler */
568 regs->pc = (unsigned long) ka->sa.sa_handler;
569 regs->npc = (regs->pc + 4);
570
571 /* 5. return to kernel instructions */
572 if (ka->ka_restorer)
573 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
574 else {
575 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
576
577 /* mov __NR_sigreturn, %g1 */
578 err |= __put_user(0x821020d8, &sf->insns[0]);
579
580 /* t 0x10 */
581 err |= __put_user(0x91d02010, &sf->insns[1]);
582 if (err)
583 goto sigsegv;
584
585 /* Flush instruction space. */
586 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
587 }
588 return;
589
590 sigill_and_return:
591 do_exit(SIGILL);
592 sigsegv:
593 force_sigsegv(signo, current);
594 }
595
596 static inline void
597 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
598 int signo, sigset_t *oldset, siginfo_t *info)
599 {
600 struct rt_signal_frame __user *sf;
601 int sigframe_size;
602 unsigned int psr;
603 int err;
604
605 synchronize_user_stack();
606 sigframe_size = RT_ALIGNEDSZ;
607 if (!used_math())
608 sigframe_size -= sizeof(__siginfo_fpu_t);
609 sf = (struct rt_signal_frame __user *)
610 get_sigframe(&ka->sa, regs, sigframe_size);
611 if (invalid_frame_pointer(sf, sigframe_size))
612 goto sigill;
613 if (current_thread_info()->w_saved != 0)
614 goto sigill;
615
616 err = __put_user(regs->pc, &sf->regs.pc);
617 err |= __put_user(regs->npc, &sf->regs.npc);
618 err |= __put_user(regs->y, &sf->regs.y);
619 psr = regs->psr;
620 if (used_math())
621 psr |= PSR_EF;
622 err |= __put_user(psr, &sf->regs.psr);
623 err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
624 err |= __put_user(0, &sf->extra_size);
625
626 if (psr & PSR_EF) {
627 err |= save_fpu_state(regs, &sf->fpu_state);
628 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
629 } else {
630 err |= __put_user(0, &sf->fpu_save);
631 }
632 err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
633
634 /* Setup sigaltstack */
635 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
636 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
637 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
638
639 err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
640 sizeof(struct reg_window));
641
642 err |= copy_siginfo_to_user(&sf->info, info);
643
644 if (err)
645 goto sigsegv;
646
647 regs->u_regs[UREG_FP] = (unsigned long) sf;
648 regs->u_regs[UREG_I0] = signo;
649 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
650 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
651
652 regs->pc = (unsigned long) ka->sa.sa_handler;
653 regs->npc = (regs->pc + 4);
654
655 if (ka->ka_restorer)
656 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
657 else {
658 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
659
660 /* mov __NR_sigreturn, %g1 */
661 err |= __put_user(0x821020d8, &sf->insns[0]);
662
663 /* t 0x10 */
664 err |= __put_user(0x91d02010, &sf->insns[1]);
665 if (err)
666 goto sigsegv;
667
668 /* Flush instruction space. */
669 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
670 }
671 return;
672
673 sigill:
674 do_exit(SIGILL);
675 sigsegv:
676 force_sigsegv(signo, current);
677 }
678
679 /* Setup a Solaris stack frame */
680 static inline void
681 setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
682 struct pt_regs *regs, int signr, sigset_t *oldset)
683 {
684 svr4_signal_frame_t __user *sfp;
685 svr4_gregset_t __user *gr;
686 svr4_siginfo_t __user *si;
687 svr4_mcontext_t __user *mc;
688 svr4_gwindows_t __user *gw;
689 svr4_ucontext_t __user *uc;
690 svr4_sigset_t setv;
691 struct thread_info *tp = current_thread_info();
692 int window = 0, err;
693
694 synchronize_user_stack();
695 sfp = (svr4_signal_frame_t __user *)
696 get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window));
697
698 if (invalid_frame_pointer(sfp, sizeof(*sfp)))
699 goto sigill_and_return;
700
701 /* Start with a clean frame pointer and fill it */
702 err = __clear_user(sfp, sizeof(*sfp));
703
704 /* Setup convenience variables */
705 si = &sfp->si;
706 uc = &sfp->uc;
707 gw = &sfp->gw;
708 mc = &uc->mcontext;
709 gr = &mc->greg;
710
711 /* FIXME: where am I supposed to put this?
712 * sc->sigc_onstack = old_status;
713 * anyways, it does not look like it is used for anything at all.
714 */
715 setv.sigbits[0] = oldset->sig[0];
716 setv.sigbits[1] = oldset->sig[1];
717 if (_NSIG_WORDS >= 4) {
718 setv.sigbits[2] = oldset->sig[2];
719 setv.sigbits[3] = oldset->sig[3];
720 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
721 } else
722 err |= __copy_to_user(&uc->sigmask, &setv,
723 2 * sizeof(unsigned int));
724
725 /* Store registers */
726 err |= __put_user(regs->pc, &((*gr)[SVR4_PC]));
727 err |= __put_user(regs->npc, &((*gr)[SVR4_NPC]));
728 err |= __put_user(regs->psr, &((*gr)[SVR4_PSR]));
729 err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
730
731 /* Copy g[1..7] and o[0..7] registers */
732 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
733 sizeof(long) * 7);
734 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
735 sizeof(long) * 8);
736
737 /* Setup sigaltstack */
738 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
739 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
740 err |= __put_user(current->sas_ss_size, &uc->stack.size);
741
742 /* Save the currently window file: */
743
744 /* 1. Link sfp->uc->gwins to our windows */
745 err |= __put_user(gw, &mc->gwin);
746
747 /* 2. Number of windows to restore at setcontext(): */
748 err |= __put_user(tp->w_saved, &gw->count);
749
750 /* 3. Save each valid window
751 * Currently, it makes a copy of the windows from the kernel copy.
752 * David's code for SunOS, makes the copy but keeps the pointer to
753 * the kernel. My version makes the pointer point to a userland
754 * copy of those. Mhm, I wonder if I shouldn't just ignore those
755 * on setcontext and use those that are on the kernel, the signal
756 * handler should not be modyfing those, mhm.
757 *
758 * These windows are just used in case synchronize_user_stack failed
759 * to flush the user windows.
760 */
761 for (window = 0; window < tp->w_saved; window++) {
762 err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]);
763 err |= __copy_to_user(&gw->win[window],
764 &tp->reg_window[window],
765 sizeof(svr4_rwindow_t));
766 err |= __put_user(0, gw->winptr[window]);
767 }
768
769 /* 4. We just pay attention to the gw->count field on setcontext */
770 tp->w_saved = 0; /* So process is allowed to execute. */
771
772 /* Setup the signal information. Solaris expects a bunch of
773 * information to be passed to the signal handler, we don't provide
774 * that much currently, should use siginfo.
775 */
776 err |= __put_user(signr, &si->siginfo.signo);
777 err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
778 if (err)
779 goto sigsegv;
780
781 regs->u_regs[UREG_FP] = (unsigned long) sfp;
782 regs->pc = (unsigned long) sa->sa_handler;
783 regs->npc = (regs->pc + 4);
784
785 /* Arguments passed to signal handler */
786 if (regs->u_regs[14]){
787 struct reg_window __user *rw = (struct reg_window __user *)
788 regs->u_regs[14];
789
790 err |= __put_user(signr, &rw->ins[0]);
791 err |= __put_user(si, &rw->ins[1]);
792 err |= __put_user(uc, &rw->ins[2]);
793 err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */
794 if (err)
795 goto sigsegv;
796
797 regs->u_regs[UREG_I0] = signr;
798 regs->u_regs[UREG_I1] = (unsigned long) si;
799 regs->u_regs[UREG_I2] = (unsigned long) uc;
800 }
801 return;
802
803 sigill_and_return:
804 do_exit(SIGILL);
805 sigsegv:
806 force_sigsegv(signr, current);
807 }
808
809 asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
810 {
811 svr4_gregset_t __user *gr;
812 svr4_mcontext_t __user *mc;
813 svr4_sigset_t setv;
814 int err = 0;
815
816 synchronize_user_stack();
817
818 if (current_thread_info()->w_saved)
819 return -EFAULT;
820
821 err = clear_user(uc, sizeof(*uc));
822 if (err)
823 return -EFAULT;
824
825 /* Setup convenience variables */
826 mc = &uc->mcontext;
827 gr = &mc->greg;
828
829 setv.sigbits[0] = current->blocked.sig[0];
830 setv.sigbits[1] = current->blocked.sig[1];
831 if (_NSIG_WORDS >= 4) {
832 setv.sigbits[2] = current->blocked.sig[2];
833 setv.sigbits[3] = current->blocked.sig[3];
834 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
835 } else
836 err |= __copy_to_user(&uc->sigmask, &setv,
837 2 * sizeof(unsigned int));
838
839 /* Store registers */
840 err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]);
841 err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]);
842 err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]);
843 err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
844
845 /* Copy g[1..7] and o[0..7] registers */
846 err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
847 sizeof(uint) * 7);
848 err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
849 sizeof(uint) * 8);
850
851 /* Setup sigaltstack */
852 err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
853 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
854 err |= __put_user(current->sas_ss_size, &uc->stack.size);
855
856 /* The register file is not saved
857 * we have already stuffed all of it with sync_user_stack
858 */
859 return (err ? -EFAULT : 0);
860 }
861
862 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
863 asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
864 {
865 svr4_gregset_t __user *gr;
866 unsigned long pc, npc, psr;
867 mm_segment_t old_fs;
868 sigset_t set;
869 svr4_sigset_t setv;
870 int err;
871 stack_t st;
872
873 /* Fixme: restore windows, or is this already taken care of in
874 * svr4_setup_frame when sync_user_windows is done?
875 */
876 flush_user_windows();
877
878 if (current_thread_info()->w_saved)
879 goto sigsegv_and_return;
880
881 if (((unsigned long) c) & 3)
882 goto sigsegv_and_return;
883
884 if (!__access_ok((unsigned long)c, sizeof(*c)))
885 goto sigsegv_and_return;
886
887 /* Check for valid PC and nPC */
888 gr = &c->mcontext.greg;
889 err = __get_user(pc, &((*gr)[SVR4_PC]));
890 err |= __get_user(npc, &((*gr)[SVR4_NPC]));
891
892 if ((pc | npc) & 3)
893 goto sigsegv_and_return;
894
895 /* Retrieve information from passed ucontext */
896 /* note that nPC is ored a 1, this is used to inform entry.S */
897 /* that we don't want it to mess with our PC and nPC */
898
899 /* This is pretty much atomic, no amount locking would prevent
900 * the races which exist anyways.
901 */
902 err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
903
904 err |= __get_user(st.ss_sp, &c->stack.sp);
905 err |= __get_user(st.ss_flags, &c->stack.flags);
906 err |= __get_user(st.ss_size, &c->stack.size);
907
908 if (err)
909 goto sigsegv_and_return;
910
911 /* It is more difficult to avoid calling this function than to
912 call it and ignore errors. */
913 old_fs = get_fs();
914 set_fs(KERNEL_DS);
915 do_sigaltstack((const stack_t __user *) &st, NULL,
916 regs->u_regs[UREG_I6]);
917 set_fs(old_fs);
918
919 set.sig[0] = setv.sigbits[0];
920 set.sig[1] = setv.sigbits[1];
921 if (_NSIG_WORDS >= 4) {
922 set.sig[2] = setv.sigbits[2];
923 set.sig[3] = setv.sigbits[3];
924 }
925 sigdelsetmask(&set, ~_BLOCKABLE);
926 spin_lock_irq(&current->sighand->siglock);
927 current->blocked = set;
928 recalc_sigpending();
929 spin_unlock_irq(&current->sighand->siglock);
930 regs->pc = pc;
931 regs->npc = npc | 1;
932 err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
933 err |= __get_user(psr, &((*gr)[SVR4_PSR]));
934 regs->psr &= ~(PSR_ICC);
935 regs->psr |= (psr & PSR_ICC);
936
937 /* Restore g[1..7] and o[0..7] registers */
938 err |= __copy_from_user(&regs->u_regs[UREG_G1], &(*gr)[SVR4_G1],
939 sizeof(long) * 7);
940 err |= __copy_from_user(&regs->u_regs[UREG_I0], &(*gr)[SVR4_O0],
941 sizeof(long) * 8);
942 return (err ? -EFAULT : 0);
943
944 sigsegv_and_return:
945 force_sig(SIGSEGV, current);
946 return -EFAULT;
947 }
948
949 static inline void
950 handle_signal(unsigned long signr, struct k_sigaction *ka,
951 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
952 int svr4_signal)
953 {
954 if (svr4_signal)
955 setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
956 else {
957 if (ka->sa.sa_flags & SA_SIGINFO)
958 new_setup_rt_frame(ka, regs, signr, oldset, info);
959 else if (current->thread.new_signal)
960 new_setup_frame(ka, regs, signr, oldset);
961 else
962 setup_frame(&ka->sa, regs, signr, oldset, info);
963 }
964 spin_lock_irq(&current->sighand->siglock);
965 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
966 if (!(ka->sa.sa_flags & SA_NOMASK))
967 sigaddset(&current->blocked, signr);
968 recalc_sigpending();
969 spin_unlock_irq(&current->sighand->siglock);
970 }
971
972 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
973 struct sigaction *sa)
974 {
975 switch(regs->u_regs[UREG_I0]) {
976 case ERESTART_RESTARTBLOCK:
977 case ERESTARTNOHAND:
978 no_system_call_restart:
979 regs->u_regs[UREG_I0] = EINTR;
980 regs->psr |= PSR_C;
981 break;
982 case ERESTARTSYS:
983 if (!(sa->sa_flags & SA_RESTART))
984 goto no_system_call_restart;
985 /* fallthrough */
986 case ERESTARTNOINTR:
987 regs->u_regs[UREG_I0] = orig_i0;
988 regs->pc -= 4;
989 regs->npc -= 4;
990 }
991 }
992
993 /* Note that 'init' is a special process: it doesn't get signals it doesn't
994 * want to handle. Thus you cannot kill init even with a SIGKILL even by
995 * mistake.
996 */
997 asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
998 {
999 siginfo_t info;
1000 struct sparc_deliver_cookie cookie;
1001 struct k_sigaction ka;
1002 int signr;
1003 sigset_t *oldset;
1004
1005 /*
1006 * XXX Disable svr4 signal handling until solaris emulation works.
1007 * It is buggy - Anton
1008 */
1009 #define SVR4_SIGNAL_BROKEN 1
1010 #ifdef SVR4_SIGNAL_BROKEN
1011 int svr4_signal = 0;
1012 #else
1013 int svr4_signal = current->personality == PER_SVR4;
1014 #endif
1015
1016 cookie.restart_syscall = restart_syscall;
1017 cookie.orig_i0 = orig_i0;
1018
1019 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1020 oldset = &current->saved_sigmask;
1021 else
1022 oldset = &current->blocked;
1023
1024 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
1025 if (signr > 0) {
1026 if (cookie.restart_syscall)
1027 syscall_restart(cookie.orig_i0, regs, &ka.sa);
1028 handle_signal(signr, &ka, &info, oldset,
1029 regs, svr4_signal);
1030 /* a signal was successfully delivered; the saved
1031 * sigmask will have been stored in the signal frame,
1032 * and will be restored by sigreturn, so we can simply
1033 * clear the TIF_RESTORE_SIGMASK flag.
1034 */
1035 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1036 clear_thread_flag(TIF_RESTORE_SIGMASK);
1037 return;
1038 }
1039 if (cookie.restart_syscall &&
1040 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1041 regs->u_regs[UREG_I0] == ERESTARTSYS ||
1042 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1043 /* replay the system call when we are done */
1044 regs->u_regs[UREG_I0] = cookie.orig_i0;
1045 regs->pc -= 4;
1046 regs->npc -= 4;
1047 }
1048 if (cookie.restart_syscall &&
1049 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1050 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1051 regs->pc -= 4;
1052 regs->npc -= 4;
1053 }
1054
1055 /* if there's no signal to deliver, we just put the saved sigmask
1056 * back
1057 */
1058 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
1059 clear_thread_flag(TIF_RESTORE_SIGMASK);
1060 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
1061 }
1062 }
1063
1064 asmlinkage int
1065 do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
1066 unsigned long sp)
1067 {
1068 int ret = -EFAULT;
1069
1070 /* First see if old state is wanted. */
1071 if (ossptr) {
1072 if (put_user(current->sas_ss_sp + current->sas_ss_size,
1073 &ossptr->the_stack) ||
1074 __put_user(on_sig_stack(sp), &ossptr->cur_status))
1075 goto out;
1076 }
1077
1078 /* Now see if we want to update the new state. */
1079 if (ssptr) {
1080 char *ss_sp;
1081
1082 if (get_user(ss_sp, &ssptr->the_stack))
1083 goto out;
1084 /* If the current stack was set with sigaltstack, don't
1085 swap stacks while we are on it. */
1086 ret = -EPERM;
1087 if (current->sas_ss_sp && on_sig_stack(sp))
1088 goto out;
1089
1090 /* Since we don't know the extent of the stack, and we don't
1091 track onstack-ness, but rather calculate it, we must
1092 presume a size. Ho hum this interface is lossy. */
1093 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
1094 current->sas_ss_size = SIGSTKSZ;
1095 }
1096 ret = 0;
1097 out:
1098 return ret;
1099 }
1100
1101 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
1102 {
1103 struct sparc_deliver_cookie *cp = cookie;
1104
1105 if (cp->restart_syscall &&
1106 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1107 regs->u_regs[UREG_I0] == ERESTARTSYS ||
1108 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1109 /* replay the system call when we are done */
1110 regs->u_regs[UREG_I0] = cp->orig_i0;
1111 regs->pc -= 4;
1112 regs->npc -= 4;
1113 cp->restart_syscall = 0;
1114 }
1115
1116 if (cp->restart_syscall &&
1117 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1118 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1119 regs->pc -= 4;
1120 regs->npc -= 4;
1121 cp->restart_syscall = 0;
1122 }
1123 }
WRT350N Kernel Patches