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initial commit with v3.6.7
[linux-3.6.7-moxart.git] / arch / m68k / kernel / signal.c
blob710a528b928b8580ac4281449586ee4507966db9
1 /*
2 * linux/arch/m68k/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11 /*
12 * Linux/m68k support by Hamish Macdonald
13 *
14 * 68060 fixes by Jesper Skov
15 *
16 * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
17 *
18 * mathemu support by Roman Zippel
19 * (Note: fpstate in the signal context is completely ignored for the emulator
20 * and the internal floating point format is put on stack)
21 */
22
23 /*
24 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
25 * Atari :-) Current limitation: Only one sigstack can be active at one time.
26 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
27 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
28 * signal handlers!
29 */
30
31 #include <linux/sched.h>
32 #include <linux/mm.h>
33 #include <linux/kernel.h>
34 #include <linux/signal.h>
35 #include <linux/syscalls.h>
36 #include <linux/errno.h>
37 #include <linux/wait.h>
38 #include <linux/ptrace.h>
39 #include <linux/unistd.h>
40 #include <linux/stddef.h>
41 #include <linux/highuid.h>
42 #include <linux/personality.h>
43 #include <linux/tty.h>
44 #include <linux/binfmts.h>
45 #include <linux/module.h>
46 #include <linux/tracehook.h>
47
48 #include <asm/setup.h>
49 #include <asm/uaccess.h>
50 #include <asm/pgtable.h>
51 #include <asm/traps.h>
52 #include <asm/ucontext.h>
53
54 #ifdef CONFIG_MMU
55
56 /*
57 * Handle the slight differences in classic 68k and ColdFire trap frames.
58 */
59 #ifdef CONFIG_COLDFIRE
60 #define FORMAT 4
61 #define FMT4SIZE 0
62 #else
63 #define FORMAT 0
64 #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
65 #endif
66
67 static const int frame_size_change[16] = {
68 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
69 [2] = sizeof(((struct frame *)0)->un.fmt2),
70 [3] = sizeof(((struct frame *)0)->un.fmt3),
71 [4] = FMT4SIZE,
72 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
73 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
74 [7] = sizeof(((struct frame *)0)->un.fmt7),
75 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
76 [9] = sizeof(((struct frame *)0)->un.fmt9),
77 [10] = sizeof(((struct frame *)0)->un.fmta),
78 [11] = sizeof(((struct frame *)0)->un.fmtb),
79 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
80 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
81 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
82 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
83 };
84
85 static inline int frame_extra_sizes(int f)
86 {
87 return frame_size_change[f];
88 }
89
90 int handle_kernel_fault(struct pt_regs *regs)
91 {
92 const struct exception_table_entry *fixup;
93 struct pt_regs *tregs;
94
95 /* Are we prepared to handle this kernel fault? */
96 fixup = search_exception_tables(regs->pc);
97 if (!fixup)
98 return 0;
99
100 /* Create a new four word stack frame, discarding the old one. */
101 regs->stkadj = frame_extra_sizes(regs->format);
102 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
103 tregs->vector = regs->vector;
104 tregs->format = FORMAT;
105 tregs->pc = fixup->fixup;
106 tregs->sr = regs->sr;
107
108 return 1;
109 }
110
111 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
112 {
113 if (regs->orig_d0 < 0)
114 return;
115 switch (regs->d0) {
116 case -ERESTARTNOHAND:
117 case -ERESTARTSYS:
118 case -ERESTARTNOINTR:
119 regs->d0 = regs->orig_d0;
120 regs->orig_d0 = -1;
121 regs->pc -= 2;
122 break;
123 }
124 }
125
126 static inline void push_cache (unsigned long vaddr)
127 {
128 /*
129 * Using the old cache_push_v() was really a big waste.
130 *
131 * What we are trying to do is to flush 8 bytes to ram.
132 * Flushing 2 cache lines of 16 bytes is much cheaper than
133 * flushing 1 or 2 pages, as previously done in
134 * cache_push_v().
135 * Jes
136 */
137 if (CPU_IS_040) {
138 unsigned long temp;
139
140 __asm__ __volatile__ (".chip 68040\n\t"
141 "nop\n\t"
142 "ptestr (%1)\n\t"
143 "movec %%mmusr,%0\n\t"
144 ".chip 68k"
145 : "=r" (temp)
146 : "a" (vaddr));
147
148 temp &= PAGE_MASK;
149 temp |= vaddr & ~PAGE_MASK;
150
151 __asm__ __volatile__ (".chip 68040\n\t"
152 "nop\n\t"
153 "cpushl %%bc,(%0)\n\t"
154 ".chip 68k"
155 : : "a" (temp));
156 }
157 else if (CPU_IS_060) {
158 unsigned long temp;
159 __asm__ __volatile__ (".chip 68060\n\t"
160 "plpar (%0)\n\t"
161 ".chip 68k"
162 : "=a" (temp)
163 : "0" (vaddr));
164 __asm__ __volatile__ (".chip 68060\n\t"
165 "cpushl %%bc,(%0)\n\t"
166 ".chip 68k"
167 : : "a" (temp));
168 } else if (!CPU_IS_COLDFIRE) {
169 /*
170 * 68030/68020 have no writeback cache;
171 * still need to clear icache.
172 * Note that vaddr is guaranteed to be long word aligned.
173 */
174 unsigned long temp;
175 asm volatile ("movec %%cacr,%0" : "=r" (temp));
176 temp += 4;
177 asm volatile ("movec %0,%%caar\n\t"
178 "movec %1,%%cacr"
179 : : "r" (vaddr), "r" (temp));
180 asm volatile ("movec %0,%%caar\n\t"
181 "movec %1,%%cacr"
182 : : "r" (vaddr + 4), "r" (temp));
183 }
184 }
185
186 static inline void adjustformat(struct pt_regs *regs)
187 {
188 }
189
190 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
191 {
192 }
193
194 #else /* CONFIG_MMU */
195
196 void ret_from_user_signal(void);
197 void ret_from_user_rt_signal(void);
198
199 static inline int frame_extra_sizes(int f)
200 {
201 /* No frame size adjustments required on non-MMU CPUs */
202 return 0;
203 }
204
205 static inline void adjustformat(struct pt_regs *regs)
206 {
207 ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
208 /*
209 * set format byte to make stack appear modulo 4, which it will
210 * be when doing the rte
211 */
212 regs->format = 0x4;
213 }
214
215 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
216 {
217 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
218 }
219
220 static inline void push_cache(unsigned long vaddr)
221 {
222 }
223
224 #endif /* CONFIG_MMU */
225
226 /*
227 * Atomically swap in the new signal mask, and wait for a signal.
228 */
229 asmlinkage int
230 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
231 {
232 sigset_t blocked;
233 siginitset(&blocked, mask);
234 return sigsuspend(&blocked);
235 }
236
237 asmlinkage int
238 sys_sigaction(int sig, const struct old_sigaction __user *act,
239 struct old_sigaction __user *oact)
240 {
241 struct k_sigaction new_ka, old_ka;
242 int ret;
243
244 if (act) {
245 old_sigset_t mask;
246 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
247 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
248 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
249 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
250 __get_user(mask, &act->sa_mask))
251 return -EFAULT;
252 siginitset(&new_ka.sa.sa_mask, mask);
253 }
254
255 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
256
257 if (!ret && oact) {
258 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
259 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
260 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
261 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
262 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
263 return -EFAULT;
264 }
265
266 return ret;
267 }
268
269 asmlinkage int
270 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
271 {
272 return do_sigaltstack(uss, uoss, rdusp());
273 }
274
275
276 /*
277 * Do a signal return; undo the signal stack.
278 *
279 * Keep the return code on the stack quadword aligned!
280 * That makes the cache flush below easier.
281 */
282
283 struct sigframe
284 {
285 char __user *pretcode;
286 int sig;
287 int code;
288 struct sigcontext __user *psc;
289 char retcode[8];
290 unsigned long extramask[_NSIG_WORDS-1];
291 struct sigcontext sc;
292 };
293
294 struct rt_sigframe
295 {
296 char __user *pretcode;
297 int sig;
298 struct siginfo __user *pinfo;
299 void __user *puc;
300 char retcode[8];
301 struct siginfo info;
302 struct ucontext uc;
303 };
304
305 #define FPCONTEXT_SIZE 216
306 #define uc_fpstate uc_filler[0]
307 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
308 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
309
310 #ifdef CONFIG_FPU
311
312 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
313
314 static inline int restore_fpu_state(struct sigcontext *sc)
315 {
316 int err = 1;
317
318 if (FPU_IS_EMU) {
319 /* restore registers */
320 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
321 memcpy(current->thread.fp, sc->sc_fpregs, 24);
322 return 0;
323 }
324
325 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
326 /* Verify the frame format. */
327 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
328 (sc->sc_fpstate[0] != fpu_version))
329 goto out;
330 if (CPU_IS_020_OR_030) {
331 if (m68k_fputype & FPU_68881 &&
332 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
333 goto out;
334 if (m68k_fputype & FPU_68882 &&
335 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
336 goto out;
337 } else if (CPU_IS_040) {
338 if (!(sc->sc_fpstate[1] == 0x00 ||
339 sc->sc_fpstate[1] == 0x28 ||
340 sc->sc_fpstate[1] == 0x60))
341 goto out;
342 } else if (CPU_IS_060) {
343 if (!(sc->sc_fpstate[3] == 0x00 ||
344 sc->sc_fpstate[3] == 0x60 ||
345 sc->sc_fpstate[3] == 0xe0))
346 goto out;
347 } else if (CPU_IS_COLDFIRE) {
348 if (!(sc->sc_fpstate[0] == 0x00 ||
349 sc->sc_fpstate[0] == 0x05 ||
350 sc->sc_fpstate[0] == 0xe5))
351 goto out;
352 } else
353 goto out;
354
355 if (CPU_IS_COLDFIRE) {
356 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
357 "fmovel %1,%%fpcr\n\t"
358 "fmovel %2,%%fpsr\n\t"
359 "fmovel %3,%%fpiar"
360 : /* no outputs */
361 : "m" (sc->sc_fpregs[0]),
362 "m" (sc->sc_fpcntl[0]),
363 "m" (sc->sc_fpcntl[1]),
364 "m" (sc->sc_fpcntl[2]));
365 } else {
366 __asm__ volatile (".chip 68k/68881\n\t"
367 "fmovemx %0,%%fp0-%%fp1\n\t"
368 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
369 ".chip 68k"
370 : /* no outputs */
371 : "m" (*sc->sc_fpregs),
372 "m" (*sc->sc_fpcntl));
373 }
374 }
375
376 if (CPU_IS_COLDFIRE) {
377 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
378 } else {
379 __asm__ volatile (".chip 68k/68881\n\t"
380 "frestore %0\n\t"
381 ".chip 68k"
382 : : "m" (*sc->sc_fpstate));
383 }
384 err = 0;
385
386 out:
387 return err;
388 }
389
390 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
391 {
392 unsigned char fpstate[FPCONTEXT_SIZE];
393 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
394 fpregset_t fpregs;
395 int err = 1;
396
397 if (FPU_IS_EMU) {
398 /* restore fpu control register */
399 if (__copy_from_user(current->thread.fpcntl,
400 uc->uc_mcontext.fpregs.f_fpcntl, 12))
401 goto out;
402 /* restore all other fpu register */
403 if (__copy_from_user(current->thread.fp,
404 uc->uc_mcontext.fpregs.f_fpregs, 96))
405 goto out;
406 return 0;
407 }
408
409 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
410 goto out;
411 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
412 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
413 context_size = fpstate[1];
414 /* Verify the frame format. */
415 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
416 (fpstate[0] != fpu_version))
417 goto out;
418 if (CPU_IS_020_OR_030) {
419 if (m68k_fputype & FPU_68881 &&
420 !(context_size == 0x18 || context_size == 0xb4))
421 goto out;
422 if (m68k_fputype & FPU_68882 &&
423 !(context_size == 0x38 || context_size == 0xd4))
424 goto out;
425 } else if (CPU_IS_040) {
426 if (!(context_size == 0x00 ||
427 context_size == 0x28 ||
428 context_size == 0x60))
429 goto out;
430 } else if (CPU_IS_060) {
431 if (!(fpstate[3] == 0x00 ||
432 fpstate[3] == 0x60 ||
433 fpstate[3] == 0xe0))
434 goto out;
435 } else if (CPU_IS_COLDFIRE) {
436 if (!(fpstate[3] == 0x00 ||
437 fpstate[3] == 0x05 ||
438 fpstate[3] == 0xe5))
439 goto out;
440 } else
441 goto out;
442 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
443 sizeof(fpregs)))
444 goto out;
445
446 if (CPU_IS_COLDFIRE) {
447 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
448 "fmovel %1,%%fpcr\n\t"
449 "fmovel %2,%%fpsr\n\t"
450 "fmovel %3,%%fpiar"
451 : /* no outputs */
452 : "m" (fpregs.f_fpregs[0]),
453 "m" (fpregs.f_fpcntl[0]),
454 "m" (fpregs.f_fpcntl[1]),
455 "m" (fpregs.f_fpcntl[2]));
456 } else {
457 __asm__ volatile (".chip 68k/68881\n\t"
458 "fmovemx %0,%%fp0-%%fp7\n\t"
459 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
460 ".chip 68k"
461 : /* no outputs */
462 : "m" (*fpregs.f_fpregs),
463 "m" (*fpregs.f_fpcntl));
464 }
465 }
466 if (context_size &&
467 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
468 context_size))
469 goto out;
470
471 if (CPU_IS_COLDFIRE) {
472 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
473 } else {
474 __asm__ volatile (".chip 68k/68881\n\t"
475 "frestore %0\n\t"
476 ".chip 68k"
477 : : "m" (*fpstate));
478 }
479 err = 0;
480
481 out:
482 return err;
483 }
484
485 /*
486 * Set up a signal frame.
487 */
488 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
489 {
490 if (FPU_IS_EMU) {
491 /* save registers */
492 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
493 memcpy(sc->sc_fpregs, current->thread.fp, 24);
494 return;
495 }
496
497 if (CPU_IS_COLDFIRE) {
498 __asm__ volatile ("fsave %0"
499 : : "m" (*sc->sc_fpstate) : "memory");
500 } else {
501 __asm__ volatile (".chip 68k/68881\n\t"
502 "fsave %0\n\t"
503 ".chip 68k"
504 : : "m" (*sc->sc_fpstate) : "memory");
505 }
506
507 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
508 fpu_version = sc->sc_fpstate[0];
509 if (CPU_IS_020_OR_030 &&
510 regs->vector >= (VEC_FPBRUC * 4) &&
511 regs->vector <= (VEC_FPNAN * 4)) {
512 /* Clear pending exception in 68882 idle frame */
513 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
514 sc->sc_fpstate[0x38] |= 1 << 3;
515 }
516
517 if (CPU_IS_COLDFIRE) {
518 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
519 "fmovel %%fpcr,%1\n\t"
520 "fmovel %%fpsr,%2\n\t"
521 "fmovel %%fpiar,%3"
522 : "=m" (sc->sc_fpregs[0]),
523 "=m" (sc->sc_fpcntl[0]),
524 "=m" (sc->sc_fpcntl[1]),
525 "=m" (sc->sc_fpcntl[2])
526 : /* no inputs */
527 : "memory");
528 } else {
529 __asm__ volatile (".chip 68k/68881\n\t"
530 "fmovemx %%fp0-%%fp1,%0\n\t"
531 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
532 ".chip 68k"
533 : "=m" (*sc->sc_fpregs),
534 "=m" (*sc->sc_fpcntl)
535 : /* no inputs */
536 : "memory");
537 }
538 }
539 }
540
541 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
542 {
543 unsigned char fpstate[FPCONTEXT_SIZE];
544 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
545 int err = 0;
546
547 if (FPU_IS_EMU) {
548 /* save fpu control register */
549 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
550 current->thread.fpcntl, 12);
551 /* save all other fpu register */
552 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
553 current->thread.fp, 96);
554 return err;
555 }
556
557 if (CPU_IS_COLDFIRE) {
558 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
559 } else {
560 __asm__ volatile (".chip 68k/68881\n\t"
561 "fsave %0\n\t"
562 ".chip 68k"
563 : : "m" (*fpstate) : "memory");
564 }
565
566 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
567 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
568 fpregset_t fpregs;
569 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
570 context_size = fpstate[1];
571 fpu_version = fpstate[0];
572 if (CPU_IS_020_OR_030 &&
573 regs->vector >= (VEC_FPBRUC * 4) &&
574 regs->vector <= (VEC_FPNAN * 4)) {
575 /* Clear pending exception in 68882 idle frame */
576 if (*(unsigned short *) fpstate == 0x1f38)
577 fpstate[0x38] |= 1 << 3;
578 }
579 if (CPU_IS_COLDFIRE) {
580 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
581 "fmovel %%fpcr,%1\n\t"
582 "fmovel %%fpsr,%2\n\t"
583 "fmovel %%fpiar,%3"
584 : "=m" (fpregs.f_fpregs[0]),
585 "=m" (fpregs.f_fpcntl[0]),
586 "=m" (fpregs.f_fpcntl[1]),
587 "=m" (fpregs.f_fpcntl[2])
588 : /* no inputs */
589 : "memory");
590 } else {
591 __asm__ volatile (".chip 68k/68881\n\t"
592 "fmovemx %%fp0-%%fp7,%0\n\t"
593 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
594 ".chip 68k"
595 : "=m" (*fpregs.f_fpregs),
596 "=m" (*fpregs.f_fpcntl)
597 : /* no inputs */
598 : "memory");
599 }
600 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
601 sizeof(fpregs));
602 }
603 if (context_size)
604 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
605 context_size);
606 return err;
607 }
608
609 #else /* CONFIG_FPU */
610
611 /*
612 * For the case with no FPU configured these all do nothing.
613 */
614 static inline int restore_fpu_state(struct sigcontext *sc)
615 {
616 return 0;
617 }
618
619 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
620 {
621 return 0;
622 }
623
624 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
625 {
626 }
627
628 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
629 {
630 return 0;
631 }
632
633 #endif /* CONFIG_FPU */
634
635 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
636 void __user *fp)
637 {
638 int fsize = frame_extra_sizes(formatvec >> 12);
639 if (fsize < 0) {
640 /*
641 * user process trying to return with weird frame format
642 */
643 #ifdef DEBUG
644 printk("user process returning with weird frame format\n");
645 #endif
646 return 1;
647 }
648 if (!fsize) {
649 regs->format = formatvec >> 12;
650 regs->vector = formatvec & 0xfff;
651 } else {
652 struct switch_stack *sw = (struct switch_stack *)regs - 1;
653 unsigned long buf[fsize / 2]; /* yes, twice as much */
654
655 /* that'll make sure that expansion won't crap over data */
656 if (copy_from_user(buf + fsize / 4, fp, fsize))
657 return 1;
658
659 /* point of no return */
660 regs->format = formatvec >> 12;
661 regs->vector = formatvec & 0xfff;
662 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
663 __asm__ __volatile__ (
664 #ifdef CONFIG_COLDFIRE
665 " movel %0,%/sp\n\t"
666 " bra ret_from_signal\n"
667 #else
668 " movel %0,%/a0\n\t"
669 " subl %1,%/a0\n\t" /* make room on stack */
670 " movel %/a0,%/sp\n\t" /* set stack pointer */
671 /* move switch_stack and pt_regs */
672 "1: movel %0@+,%/a0@+\n\t"
673 " dbra %2,1b\n\t"
674 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
675 " lsrl #2,%1\n\t"
676 " subql #1,%1\n\t"
677 /* copy to the gap we'd made */
678 "2: movel %4@+,%/a0@+\n\t"
679 " dbra %1,2b\n\t"
680 " bral ret_from_signal\n"
681 #endif
682 : /* no outputs, it doesn't ever return */
683 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
684 "n" (frame_offset), "a" (buf + fsize/4)
685 : "a0");
686 #undef frame_offset
687 }
688 return 0;
689 }
690
691 static inline int
692 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
693 {
694 int formatvec;
695 struct sigcontext context;
696 int err = 0;
697
698 /* Always make any pending restarted system calls return -EINTR */
699 current_thread_info()->restart_block.fn = do_no_restart_syscall;
700
701 /* get previous context */
702 if (copy_from_user(&context, usc, sizeof(context)))
703 goto badframe;
704
705 /* restore passed registers */
706 regs->d0 = context.sc_d0;
707 regs->d1 = context.sc_d1;
708 regs->a0 = context.sc_a0;
709 regs->a1 = context.sc_a1;
710 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
711 regs->pc = context.sc_pc;
712 regs->orig_d0 = -1; /* disable syscall checks */
713 wrusp(context.sc_usp);
714 formatvec = context.sc_formatvec;
715
716 err = restore_fpu_state(&context);
717
718 if (err || mangle_kernel_stack(regs, formatvec, fp))
719 goto badframe;
720
721 return 0;
722
723 badframe:
724 return 1;
725 }
726
727 static inline int
728 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
729 struct ucontext __user *uc)
730 {
731 int temp;
732 greg_t __user *gregs = uc->uc_mcontext.gregs;
733 unsigned long usp;
734 int err;
735
736 /* Always make any pending restarted system calls return -EINTR */
737 current_thread_info()->restart_block.fn = do_no_restart_syscall;
738
739 err = __get_user(temp, &uc->uc_mcontext.version);
740 if (temp != MCONTEXT_VERSION)
741 goto badframe;
742 /* restore passed registers */
743 err |= __get_user(regs->d0, &gregs[0]);
744 err |= __get_user(regs->d1, &gregs[1]);
745 err |= __get_user(regs->d2, &gregs[2]);
746 err |= __get_user(regs->d3, &gregs[3]);
747 err |= __get_user(regs->d4, &gregs[4]);
748 err |= __get_user(regs->d5, &gregs[5]);
749 err |= __get_user(sw->d6, &gregs[6]);
750 err |= __get_user(sw->d7, &gregs[7]);
751 err |= __get_user(regs->a0, &gregs[8]);
752 err |= __get_user(regs->a1, &gregs[9]);
753 err |= __get_user(regs->a2, &gregs[10]);
754 err |= __get_user(sw->a3, &gregs[11]);
755 err |= __get_user(sw->a4, &gregs[12]);
756 err |= __get_user(sw->a5, &gregs[13]);
757 err |= __get_user(sw->a6, &gregs[14]);
758 err |= __get_user(usp, &gregs[15]);
759 wrusp(usp);
760 err |= __get_user(regs->pc, &gregs[16]);
761 err |= __get_user(temp, &gregs[17]);
762 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
763 regs->orig_d0 = -1; /* disable syscall checks */
764 err |= __get_user(temp, &uc->uc_formatvec);
765
766 err |= rt_restore_fpu_state(uc);
767
768 if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
769 goto badframe;
770
771 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
772 goto badframe;
773
774 return 0;
775
776 badframe:
777 return 1;
778 }
779
780 asmlinkage int do_sigreturn(unsigned long __unused)
781 {
782 struct switch_stack *sw = (struct switch_stack *) &__unused;
783 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
784 unsigned long usp = rdusp();
785 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
786 sigset_t set;
787
788 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
789 goto badframe;
790 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
791 (_NSIG_WORDS > 1 &&
792 __copy_from_user(&set.sig[1], &frame->extramask,
793 sizeof(frame->extramask))))
794 goto badframe;
795
796 set_current_blocked(&set);
797
798 if (restore_sigcontext(regs, &frame->sc, frame + 1))
799 goto badframe;
800 return regs->d0;
801
802 badframe:
803 force_sig(SIGSEGV, current);
804 return 0;
805 }
806
807 asmlinkage int do_rt_sigreturn(unsigned long __unused)
808 {
809 struct switch_stack *sw = (struct switch_stack *) &__unused;
810 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
811 unsigned long usp = rdusp();
812 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
813 sigset_t set;
814
815 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
816 goto badframe;
817 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
818 goto badframe;
819
820 set_current_blocked(&set);
821
822 if (rt_restore_ucontext(regs, sw, &frame->uc))
823 goto badframe;
824 return regs->d0;
825
826 badframe:
827 force_sig(SIGSEGV, current);
828 return 0;
829 }
830
831 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
832 unsigned long mask)
833 {
834 sc->sc_mask = mask;
835 sc->sc_usp = rdusp();
836 sc->sc_d0 = regs->d0;
837 sc->sc_d1 = regs->d1;
838 sc->sc_a0 = regs->a0;
839 sc->sc_a1 = regs->a1;
840 sc->sc_sr = regs->sr;
841 sc->sc_pc = regs->pc;
842 sc->sc_formatvec = regs->format << 12 | regs->vector;
843 save_a5_state(sc, regs);
844 save_fpu_state(sc, regs);
845 }
846
847 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
848 {
849 struct switch_stack *sw = (struct switch_stack *)regs - 1;
850 greg_t __user *gregs = uc->uc_mcontext.gregs;
851 int err = 0;
852
853 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
854 err |= __put_user(regs->d0, &gregs[0]);
855 err |= __put_user(regs->d1, &gregs[1]);
856 err |= __put_user(regs->d2, &gregs[2]);
857 err |= __put_user(regs->d3, &gregs[3]);
858 err |= __put_user(regs->d4, &gregs[4]);
859 err |= __put_user(regs->d5, &gregs[5]);
860 err |= __put_user(sw->d6, &gregs[6]);
861 err |= __put_user(sw->d7, &gregs[7]);
862 err |= __put_user(regs->a0, &gregs[8]);
863 err |= __put_user(regs->a1, &gregs[9]);
864 err |= __put_user(regs->a2, &gregs[10]);
865 err |= __put_user(sw->a3, &gregs[11]);
866 err |= __put_user(sw->a4, &gregs[12]);
867 err |= __put_user(sw->a5, &gregs[13]);
868 err |= __put_user(sw->a6, &gregs[14]);
869 err |= __put_user(rdusp(), &gregs[15]);
870 err |= __put_user(regs->pc, &gregs[16]);
871 err |= __put_user(regs->sr, &gregs[17]);
872 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
873 err |= rt_save_fpu_state(uc, regs);
874 return err;
875 }
876
877 static inline void __user *
878 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
879 {
880 unsigned long usp;
881
882 /* Default to using normal stack. */
883 usp = rdusp();
884
885 /* This is the X/Open sanctioned signal stack switching. */
886 if (ka->sa.sa_flags & SA_ONSTACK) {
887 if (!sas_ss_flags(usp))
888 usp = current->sas_ss_sp + current->sas_ss_size;
889 }
890 return (void __user *)((usp - frame_size) & -8UL);
891 }
892
893 static int setup_frame (int sig, struct k_sigaction *ka,
894 sigset_t *set, struct pt_regs *regs)
895 {
896 struct sigframe __user *frame;
897 int fsize = frame_extra_sizes(regs->format);
898 struct sigcontext context;
899 int err = 0;
900
901 if (fsize < 0) {
902 #ifdef DEBUG
903 printk ("setup_frame: Unknown frame format %#x\n",
904 regs->format);
905 #endif
906 goto give_sigsegv;
907 }
908
909 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
910
911 if (fsize)
912 err |= copy_to_user (frame + 1, regs + 1, fsize);
913
914 err |= __put_user((current_thread_info()->exec_domain
915 && current_thread_info()->exec_domain->signal_invmap
916 && sig < 32
917 ? current_thread_info()->exec_domain->signal_invmap[sig]
918 : sig),
919 &frame->sig);
920
921 err |= __put_user(regs->vector, &frame->code);
922 err |= __put_user(&frame->sc, &frame->psc);
923
924 if (_NSIG_WORDS > 1)
925 err |= copy_to_user(frame->extramask, &set->sig[1],
926 sizeof(frame->extramask));
927
928 setup_sigcontext(&context, regs, set->sig[0]);
929 err |= copy_to_user (&frame->sc, &context, sizeof(context));
930
931 /* Set up to return from userspace. */
932 #ifdef CONFIG_MMU
933 err |= __put_user(frame->retcode, &frame->pretcode);
934 /* moveq #,d0; trap #0 */
935 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
936 (long __user *)(frame->retcode));
937 #else
938 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
939 #endif
940
941 if (err)
942 goto give_sigsegv;
943
944 push_cache ((unsigned long) &frame->retcode);
945
946 /*
947 * Set up registers for signal handler. All the state we are about
948 * to destroy is successfully copied to sigframe.
949 */
950 wrusp ((unsigned long) frame);
951 regs->pc = (unsigned long) ka->sa.sa_handler;
952 adjustformat(regs);
953
954 /*
955 * This is subtle; if we build more than one sigframe, all but the
956 * first one will see frame format 0 and have fsize == 0, so we won't
957 * screw stkadj.
958 */
959 if (fsize)
960 regs->stkadj = fsize;
961
962 /* Prepare to skip over the extra stuff in the exception frame. */
963 if (regs->stkadj) {
964 struct pt_regs *tregs =
965 (struct pt_regs *)((ulong)regs + regs->stkadj);
966 #ifdef DEBUG
967 printk("Performing stackadjust=%04x\n", regs->stkadj);
968 #endif
969 /* This must be copied with decreasing addresses to
970 handle overlaps. */
971 tregs->vector = 0;
972 tregs->format = 0;
973 tregs->pc = regs->pc;
974 tregs->sr = regs->sr;
975 }
976 return 0;
977
978 give_sigsegv:
979 force_sigsegv(sig, current);
980 return err;
981 }
982
983 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
984 sigset_t *set, struct pt_regs *regs)
985 {
986 struct rt_sigframe __user *frame;
987 int fsize = frame_extra_sizes(regs->format);
988 int err = 0;
989
990 if (fsize < 0) {
991 #ifdef DEBUG
992 printk ("setup_frame: Unknown frame format %#x\n",
993 regs->format);
994 #endif
995 goto give_sigsegv;
996 }
997
998 frame = get_sigframe(ka, regs, sizeof(*frame));
999
1000 if (fsize)
1001 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
1002
1003 err |= __put_user((current_thread_info()->exec_domain
1004 && current_thread_info()->exec_domain->signal_invmap
1005 && sig < 32
1006 ? current_thread_info()->exec_domain->signal_invmap[sig]
1007 : sig),
1008 &frame->sig);
1009 err |= __put_user(&frame->info, &frame->pinfo);
1010 err |= __put_user(&frame->uc, &frame->puc);
1011 err |= copy_siginfo_to_user(&frame->info, info);
1012
1013 /* Create the ucontext. */
1014 err |= __put_user(0, &frame->uc.uc_flags);
1015 err |= __put_user(NULL, &frame->uc.uc_link);
1016 err |= __put_user((void __user *)current->sas_ss_sp,
1017 &frame->uc.uc_stack.ss_sp);
1018 err |= __put_user(sas_ss_flags(rdusp()),
1019 &frame->uc.uc_stack.ss_flags);
1020 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
1021 err |= rt_setup_ucontext(&frame->uc, regs);
1022 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
1023
1024 /* Set up to return from userspace. */
1025 #ifdef CONFIG_MMU
1026 err |= __put_user(frame->retcode, &frame->pretcode);
1027 #ifdef __mcoldfire__
1028 /* movel #__NR_rt_sigreturn,d0; trap #0 */
1029 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
1030 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
1031 (long __user *)(frame->retcode + 4));
1032 #else
1033 /* moveq #,d0; notb d0; trap #0 */
1034 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
1035 (long __user *)(frame->retcode + 0));
1036 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1037 #endif
1038 #else
1039 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
1040 #endif /* CONFIG_MMU */
1041
1042 if (err)
1043 goto give_sigsegv;
1044
1045 push_cache ((unsigned long) &frame->retcode);
1046
1047 /*
1048 * Set up registers for signal handler. All the state we are about
1049 * to destroy is successfully copied to sigframe.
1050 */
1051 wrusp ((unsigned long) frame);
1052 regs->pc = (unsigned long) ka->sa.sa_handler;
1053 adjustformat(regs);
1054
1055 /*
1056 * This is subtle; if we build more than one sigframe, all but the
1057 * first one will see frame format 0 and have fsize == 0, so we won't
1058 * screw stkadj.
1059 */
1060 if (fsize)
1061 regs->stkadj = fsize;
1062
1063 /* Prepare to skip over the extra stuff in the exception frame. */
1064 if (regs->stkadj) {
1065 struct pt_regs *tregs =
1066 (struct pt_regs *)((ulong)regs + regs->stkadj);
1067 #ifdef DEBUG
1068 printk("Performing stackadjust=%04x\n", regs->stkadj);
1069 #endif
1070 /* This must be copied with decreasing addresses to
1071 handle overlaps. */
1072 tregs->vector = 0;
1073 tregs->format = 0;
1074 tregs->pc = regs->pc;
1075 tregs->sr = regs->sr;
1076 }
1077 return 0;
1078
1079 give_sigsegv:
1080 force_sigsegv(sig, current);
1081 return err;
1082 }
1083
1084 static inline void
1085 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1086 {
1087 switch (regs->d0) {
1088 case -ERESTARTNOHAND:
1089 if (!has_handler)
1090 goto do_restart;
1091 regs->d0 = -EINTR;
1092 break;
1093
1094 case -ERESTART_RESTARTBLOCK:
1095 if (!has_handler) {
1096 regs->d0 = __NR_restart_syscall;
1097 regs->pc -= 2;
1098 break;
1099 }
1100 regs->d0 = -EINTR;
1101 break;
1102
1103 case -ERESTARTSYS:
1104 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1105 regs->d0 = -EINTR;
1106 break;
1107 }
1108 /* fallthrough */
1109 case -ERESTARTNOINTR:
1110 do_restart:
1111 regs->d0 = regs->orig_d0;
1112 regs->pc -= 2;
1113 break;
1114 }
1115 }
1116
1117 /*
1118 * OK, we're invoking a handler
1119 */
1120 static void
1121 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
1122 struct pt_regs *regs)
1123 {
1124 sigset_t *oldset = sigmask_to_save();
1125 int err;
1126 /* are we from a system call? */
1127 if (regs->orig_d0 >= 0)
1128 /* If so, check system call restarting.. */
1129 handle_restart(regs, ka, 1);
1130
1131 /* set up the stack frame */
1132 if (ka->sa.sa_flags & SA_SIGINFO)
1133 err = setup_rt_frame(sig, ka, info, oldset, regs);
1134 else
1135 err = setup_frame(sig, ka, oldset, regs);
1136
1137 if (err)
1138 return;
1139
1140 signal_delivered(sig, info, ka, regs, 0);
1141
1142 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1143 regs->sr &= ~0x8000;
1144 send_sig(SIGTRAP, current, 1);
1145 }
1146 }
1147
1148 /*
1149 * Note that 'init' is a special process: it doesn't get signals it doesn't
1150 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1151 * mistake.
1152 */
1153 static void do_signal(struct pt_regs *regs)
1154 {
1155 siginfo_t info;
1156 struct k_sigaction ka;
1157 int signr;
1158
1159 current->thread.esp0 = (unsigned long) regs;
1160
1161 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1162 if (signr > 0) {
1163 /* Whee! Actually deliver the signal. */
1164 handle_signal(signr, &ka, &info, regs);
1165 return;
1166 }
1167
1168 /* Did we come from a system call? */
1169 if (regs->orig_d0 >= 0)
1170 /* Restart the system call - no handlers present */
1171 handle_restart(regs, NULL, 0);
1172
1173 /* If there's no signal to deliver, we just restore the saved mask. */
1174 restore_saved_sigmask();
1175 }
1176
1177 void do_notify_resume(struct pt_regs *regs)
1178 {
1179 if (test_thread_flag(TIF_SIGPENDING))
1180 do_signal(regs);
1181
1182 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
1183 tracehook_notify_resume(regs);
1184 }
Linux ARM platform port for MOXA ART SoC