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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/extable.h>
46 #include <linux/tracehook.h>
47
48 #include <asm/setup.h>
49 #include <linux/uaccess.h>
50 #include <asm/pgtable.h>
51 #include <asm/traps.h>
52 #include <asm/ucontext.h>
53 #include <asm/cacheflush.h>
54
55 #ifdef CONFIG_MMU
56
57 /*
58 * Handle the slight differences in classic 68k and ColdFire trap frames.
59 */
60 #ifdef CONFIG_COLDFIRE
61 #define FORMAT 4
62 #define FMT4SIZE 0
63 #else
64 #define FORMAT 0
65 #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
66 #endif
67
68 static const int frame_size_change[16] = {
69 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
70 [2] = sizeof(((struct frame *)0)->un.fmt2),
71 [3] = sizeof(((struct frame *)0)->un.fmt3),
72 [4] = FMT4SIZE,
73 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
74 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
75 [7] = sizeof(((struct frame *)0)->un.fmt7),
76 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
77 [9] = sizeof(((struct frame *)0)->un.fmt9),
78 [10] = sizeof(((struct frame *)0)->un.fmta),
79 [11] = sizeof(((struct frame *)0)->un.fmtb),
80 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
81 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
82 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
83 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
84 };
85
86 static inline int frame_extra_sizes(int f)
87 {
88 return frame_size_change[f];
89 }
90
91 int fixup_exception(struct pt_regs *regs)
92 {
93 const struct exception_table_entry *fixup;
94 struct pt_regs *tregs;
95
96 /* Are we prepared to handle this kernel fault? */
97 fixup = search_exception_tables(regs->pc);
98 if (!fixup)
99 return 0;
100
101 /* Create a new four word stack frame, discarding the old one. */
102 regs->stkadj = frame_extra_sizes(regs->format);
103 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
104 tregs->vector = regs->vector;
105 tregs->format = FORMAT;
106 tregs->pc = fixup->fixup;
107 tregs->sr = regs->sr;
108
109 return 1;
110 }
111
112 static inline void push_cache (unsigned long vaddr)
113 {
114 /*
115 * Using the old cache_push_v() was really a big waste.
116 *
117 * What we are trying to do is to flush 8 bytes to ram.
118 * Flushing 2 cache lines of 16 bytes is much cheaper than
119 * flushing 1 or 2 pages, as previously done in
120 * cache_push_v().
121 * Jes
122 */
123 if (CPU_IS_040) {
124 unsigned long temp;
125
126 __asm__ __volatile__ (".chip 68040\n\t"
127 "nop\n\t"
128 "ptestr (%1)\n\t"
129 "movec %%mmusr,%0\n\t"
130 ".chip 68k"
131 : "=r" (temp)
132 : "a" (vaddr));
133
134 temp &= PAGE_MASK;
135 temp |= vaddr & ~PAGE_MASK;
136
137 __asm__ __volatile__ (".chip 68040\n\t"
138 "nop\n\t"
139 "cpushl %%bc,(%0)\n\t"
140 ".chip 68k"
141 : : "a" (temp));
142 }
143 else if (CPU_IS_060) {
144 unsigned long temp;
145 __asm__ __volatile__ (".chip 68060\n\t"
146 "plpar (%0)\n\t"
147 ".chip 68k"
148 : "=a" (temp)
149 : "0" (vaddr));
150 __asm__ __volatile__ (".chip 68060\n\t"
151 "cpushl %%bc,(%0)\n\t"
152 ".chip 68k"
153 : : "a" (temp));
154 } else if (!CPU_IS_COLDFIRE) {
155 /*
156 * 68030/68020 have no writeback cache;
157 * still need to clear icache.
158 * Note that vaddr is guaranteed to be long word aligned.
159 */
160 unsigned long temp;
161 asm volatile ("movec %%cacr,%0" : "=r" (temp));
162 temp += 4;
163 asm volatile ("movec %0,%%caar\n\t"
164 "movec %1,%%cacr"
165 : : "r" (vaddr), "r" (temp));
166 asm volatile ("movec %0,%%caar\n\t"
167 "movec %1,%%cacr"
168 : : "r" (vaddr + 4), "r" (temp));
169 } else {
170 /* CPU_IS_COLDFIRE */
171 #if defined(CONFIG_CACHE_COPYBACK)
172 flush_cf_dcache(0, DCACHE_MAX_ADDR);
173 #endif
174 /* Invalidate instruction cache for the pushed bytes */
175 clear_cf_icache(vaddr, vaddr + 8);
176 }
177 }
178
179 static inline void adjustformat(struct pt_regs *regs)
180 {
181 }
182
183 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
184 {
185 }
186
187 #else /* CONFIG_MMU */
188
189 void ret_from_user_signal(void);
190 void ret_from_user_rt_signal(void);
191
192 static inline int frame_extra_sizes(int f)
193 {
194 /* No frame size adjustments required on non-MMU CPUs */
195 return 0;
196 }
197
198 static inline void adjustformat(struct pt_regs *regs)
199 {
200 /*
201 * set format byte to make stack appear modulo 4, which it will
202 * be when doing the rte
203 */
204 regs->format = 0x4;
205 }
206
207 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
208 {
209 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
210 }
211
212 static inline void push_cache(unsigned long vaddr)
213 {
214 }
215
216 #endif /* CONFIG_MMU */
217
218 /*
219 * Do a signal return; undo the signal stack.
220 *
221 * Keep the return code on the stack quadword aligned!
222 * That makes the cache flush below easier.
223 */
224
225 struct sigframe
226 {
227 char __user *pretcode;
228 int sig;
229 int code;
230 struct sigcontext __user *psc;
231 char retcode[8];
232 unsigned long extramask[_NSIG_WORDS-1];
233 struct sigcontext sc;
234 };
235
236 struct rt_sigframe
237 {
238 char __user *pretcode;
239 int sig;
240 struct siginfo __user *pinfo;
241 void __user *puc;
242 char retcode[8];
243 struct siginfo info;
244 struct ucontext uc;
245 };
246
247 #define FPCONTEXT_SIZE 216
248 #define uc_fpstate uc_filler[0]
249 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
250 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
251
252 #ifdef CONFIG_FPU
253
254 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
255
256 static inline int restore_fpu_state(struct sigcontext *sc)
257 {
258 int err = 1;
259
260 if (FPU_IS_EMU) {
261 /* restore registers */
262 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
263 memcpy(current->thread.fp, sc->sc_fpregs, 24);
264 return 0;
265 }
266
267 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
268 /* Verify the frame format. */
269 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
270 (sc->sc_fpstate[0] != fpu_version))
271 goto out;
272 if (CPU_IS_020_OR_030) {
273 if (m68k_fputype & FPU_68881 &&
274 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
275 goto out;
276 if (m68k_fputype & FPU_68882 &&
277 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
278 goto out;
279 } else if (CPU_IS_040) {
280 if (!(sc->sc_fpstate[1] == 0x00 ||
281 sc->sc_fpstate[1] == 0x28 ||
282 sc->sc_fpstate[1] == 0x60))
283 goto out;
284 } else if (CPU_IS_060) {
285 if (!(sc->sc_fpstate[3] == 0x00 ||
286 sc->sc_fpstate[3] == 0x60 ||
287 sc->sc_fpstate[3] == 0xe0))
288 goto out;
289 } else if (CPU_IS_COLDFIRE) {
290 if (!(sc->sc_fpstate[0] == 0x00 ||
291 sc->sc_fpstate[0] == 0x05 ||
292 sc->sc_fpstate[0] == 0xe5))
293 goto out;
294 } else
295 goto out;
296
297 if (CPU_IS_COLDFIRE) {
298 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
299 "fmovel %1,%%fpcr\n\t"
300 "fmovel %2,%%fpsr\n\t"
301 "fmovel %3,%%fpiar"
302 : /* no outputs */
303 : "m" (sc->sc_fpregs[0]),
304 "m" (sc->sc_fpcntl[0]),
305 "m" (sc->sc_fpcntl[1]),
306 "m" (sc->sc_fpcntl[2]));
307 } else {
308 __asm__ volatile (".chip 68k/68881\n\t"
309 "fmovemx %0,%%fp0-%%fp1\n\t"
310 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
311 ".chip 68k"
312 : /* no outputs */
313 : "m" (*sc->sc_fpregs),
314 "m" (*sc->sc_fpcntl));
315 }
316 }
317
318 if (CPU_IS_COLDFIRE) {
319 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
320 } else {
321 __asm__ volatile (".chip 68k/68881\n\t"
322 "frestore %0\n\t"
323 ".chip 68k"
324 : : "m" (*sc->sc_fpstate));
325 }
326 err = 0;
327
328 out:
329 return err;
330 }
331
332 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
333 {
334 unsigned char fpstate[FPCONTEXT_SIZE];
335 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
336 fpregset_t fpregs;
337 int err = 1;
338
339 if (FPU_IS_EMU) {
340 /* restore fpu control register */
341 if (__copy_from_user(current->thread.fpcntl,
342 uc->uc_mcontext.fpregs.f_fpcntl, 12))
343 goto out;
344 /* restore all other fpu register */
345 if (__copy_from_user(current->thread.fp,
346 uc->uc_mcontext.fpregs.f_fpregs, 96))
347 goto out;
348 return 0;
349 }
350
351 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
352 goto out;
353 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
354 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
355 context_size = fpstate[1];
356 /* Verify the frame format. */
357 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
358 (fpstate[0] != fpu_version))
359 goto out;
360 if (CPU_IS_020_OR_030) {
361 if (m68k_fputype & FPU_68881 &&
362 !(context_size == 0x18 || context_size == 0xb4))
363 goto out;
364 if (m68k_fputype & FPU_68882 &&
365 !(context_size == 0x38 || context_size == 0xd4))
366 goto out;
367 } else if (CPU_IS_040) {
368 if (!(context_size == 0x00 ||
369 context_size == 0x28 ||
370 context_size == 0x60))
371 goto out;
372 } else if (CPU_IS_060) {
373 if (!(fpstate[3] == 0x00 ||
374 fpstate[3] == 0x60 ||
375 fpstate[3] == 0xe0))
376 goto out;
377 } else if (CPU_IS_COLDFIRE) {
378 if (!(fpstate[3] == 0x00 ||
379 fpstate[3] == 0x05 ||
380 fpstate[3] == 0xe5))
381 goto out;
382 } else
383 goto out;
384 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
385 sizeof(fpregs)))
386 goto out;
387
388 if (CPU_IS_COLDFIRE) {
389 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
390 "fmovel %1,%%fpcr\n\t"
391 "fmovel %2,%%fpsr\n\t"
392 "fmovel %3,%%fpiar"
393 : /* no outputs */
394 : "m" (fpregs.f_fpregs[0]),
395 "m" (fpregs.f_fpcntl[0]),
396 "m" (fpregs.f_fpcntl[1]),
397 "m" (fpregs.f_fpcntl[2]));
398 } else {
399 __asm__ volatile (".chip 68k/68881\n\t"
400 "fmovemx %0,%%fp0-%%fp7\n\t"
401 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
402 ".chip 68k"
403 : /* no outputs */
404 : "m" (*fpregs.f_fpregs),
405 "m" (*fpregs.f_fpcntl));
406 }
407 }
408 if (context_size &&
409 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
410 context_size))
411 goto out;
412
413 if (CPU_IS_COLDFIRE) {
414 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
415 } else {
416 __asm__ volatile (".chip 68k/68881\n\t"
417 "frestore %0\n\t"
418 ".chip 68k"
419 : : "m" (*fpstate));
420 }
421 err = 0;
422
423 out:
424 return err;
425 }
426
427 /*
428 * Set up a signal frame.
429 */
430 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
431 {
432 if (FPU_IS_EMU) {
433 /* save registers */
434 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
435 memcpy(sc->sc_fpregs, current->thread.fp, 24);
436 return;
437 }
438
439 if (CPU_IS_COLDFIRE) {
440 __asm__ volatile ("fsave %0"
441 : : "m" (*sc->sc_fpstate) : "memory");
442 } else {
443 __asm__ volatile (".chip 68k/68881\n\t"
444 "fsave %0\n\t"
445 ".chip 68k"
446 : : "m" (*sc->sc_fpstate) : "memory");
447 }
448
449 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
450 fpu_version = sc->sc_fpstate[0];
451 if (CPU_IS_020_OR_030 &&
452 regs->vector >= (VEC_FPBRUC * 4) &&
453 regs->vector <= (VEC_FPNAN * 4)) {
454 /* Clear pending exception in 68882 idle frame */
455 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
456 sc->sc_fpstate[0x38] |= 1 << 3;
457 }
458
459 if (CPU_IS_COLDFIRE) {
460 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
461 "fmovel %%fpcr,%1\n\t"
462 "fmovel %%fpsr,%2\n\t"
463 "fmovel %%fpiar,%3"
464 : "=m" (sc->sc_fpregs[0]),
465 "=m" (sc->sc_fpcntl[0]),
466 "=m" (sc->sc_fpcntl[1]),
467 "=m" (sc->sc_fpcntl[2])
468 : /* no inputs */
469 : "memory");
470 } else {
471 __asm__ volatile (".chip 68k/68881\n\t"
472 "fmovemx %%fp0-%%fp1,%0\n\t"
473 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
474 ".chip 68k"
475 : "=m" (*sc->sc_fpregs),
476 "=m" (*sc->sc_fpcntl)
477 : /* no inputs */
478 : "memory");
479 }
480 }
481 }
482
483 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
484 {
485 unsigned char fpstate[FPCONTEXT_SIZE];
486 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
487 int err = 0;
488
489 if (FPU_IS_EMU) {
490 /* save fpu control register */
491 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
492 current->thread.fpcntl, 12);
493 /* save all other fpu register */
494 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
495 current->thread.fp, 96);
496 return err;
497 }
498
499 if (CPU_IS_COLDFIRE) {
500 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
501 } else {
502 __asm__ volatile (".chip 68k/68881\n\t"
503 "fsave %0\n\t"
504 ".chip 68k"
505 : : "m" (*fpstate) : "memory");
506 }
507
508 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
509 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
510 fpregset_t fpregs;
511 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
512 context_size = fpstate[1];
513 fpu_version = fpstate[0];
514 if (CPU_IS_020_OR_030 &&
515 regs->vector >= (VEC_FPBRUC * 4) &&
516 regs->vector <= (VEC_FPNAN * 4)) {
517 /* Clear pending exception in 68882 idle frame */
518 if (*(unsigned short *) fpstate == 0x1f38)
519 fpstate[0x38] |= 1 << 3;
520 }
521 if (CPU_IS_COLDFIRE) {
522 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
523 "fmovel %%fpcr,%1\n\t"
524 "fmovel %%fpsr,%2\n\t"
525 "fmovel %%fpiar,%3"
526 : "=m" (fpregs.f_fpregs[0]),
527 "=m" (fpregs.f_fpcntl[0]),
528 "=m" (fpregs.f_fpcntl[1]),
529 "=m" (fpregs.f_fpcntl[2])
530 : /* no inputs */
531 : "memory");
532 } else {
533 __asm__ volatile (".chip 68k/68881\n\t"
534 "fmovemx %%fp0-%%fp7,%0\n\t"
535 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
536 ".chip 68k"
537 : "=m" (*fpregs.f_fpregs),
538 "=m" (*fpregs.f_fpcntl)
539 : /* no inputs */
540 : "memory");
541 }
542 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
543 sizeof(fpregs));
544 }
545 if (context_size)
546 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
547 context_size);
548 return err;
549 }
550
551 #else /* CONFIG_FPU */
552
553 /*
554 * For the case with no FPU configured these all do nothing.
555 */
556 static inline int restore_fpu_state(struct sigcontext *sc)
557 {
558 return 0;
559 }
560
561 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
562 {
563 return 0;
564 }
565
566 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
567 {
568 }
569
570 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
571 {
572 return 0;
573 }
574
575 #endif /* CONFIG_FPU */
576
577 static inline void siginfo_build_tests(void)
578 {
579 /*
580 * This needs to be tested on m68k as it has a lesser
581 * alignment requirement than x86 and that can cause surprises.
582 */
583
584 /* This is part of the ABI and can never change in size: */
585 BUILD_BUG_ON(sizeof(siginfo_t) != 128);
586
587 /* Ensure the known fields never change in location */
588 BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0);
589 BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4);
590 BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8);
591
592 /* _kill */
593 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
594 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
595
596 /* _timer */
597 BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c);
598 BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10);
599 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
600
601 /* _rt */
602 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
603 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
604 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
605
606 /* _sigchld */
607 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c);
608 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
609 BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14);
610 BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18);
611 BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c);
612
613 /* _sigfault */
614 BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c);
615
616 /* _sigfault._mcerr */
617 BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10);
618
619 /* _sigfault._addr_bnd */
620 BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12);
621 BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16);
622
623 /* _sigfault._addr_pkey */
624 BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12);
625
626 /* _sigpoll */
627 BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c);
628 BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10);
629
630 /* _sigsys */
631 BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c);
632 BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10);
633 BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14);
634
635 /* any new si_fields should be added here */
636 }
637
638 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
639 void __user *fp)
640 {
641 int fsize = frame_extra_sizes(formatvec >> 12);
642 if (fsize < 0) {
643 /*
644 * user process trying to return with weird frame format
645 */
646 pr_debug("user process returning with weird frame format\n");
647 return 1;
648 }
649 if (!fsize) {
650 regs->format = formatvec >> 12;
651 regs->vector = formatvec & 0xfff;
652 } else {
653 struct switch_stack *sw = (struct switch_stack *)regs - 1;
654 unsigned long buf[fsize / 2]; /* yes, twice as much */
655
656 /* that'll make sure that expansion won't crap over data */
657 if (copy_from_user(buf + fsize / 4, fp, fsize))
658 return 1;
659
660 /* point of no return */
661 regs->format = formatvec >> 12;
662 regs->vector = formatvec & 0xfff;
663 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
664 __asm__ __volatile__ (
665 #ifdef CONFIG_COLDFIRE
666 " movel %0,%/sp\n\t"
667 " bra ret_from_signal\n"
668 #else
669 " movel %0,%/a0\n\t"
670 " subl %1,%/a0\n\t" /* make room on stack */
671 " movel %/a0,%/sp\n\t" /* set stack pointer */
672 /* move switch_stack and pt_regs */
673 "1: movel %0@+,%/a0@+\n\t"
674 " dbra %2,1b\n\t"
675 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
676 " lsrl #2,%1\n\t"
677 " subql #1,%1\n\t"
678 /* copy to the gap we'd made */
679 "2: movel %4@+,%/a0@+\n\t"
680 " dbra %1,2b\n\t"
681 " bral ret_from_signal\n"
682 #endif
683 : /* no outputs, it doesn't ever return */
684 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
685 "n" (frame_offset), "a" (buf + fsize/4)
686 : "a0");
687 #undef frame_offset
688 }
689 return 0;
690 }
691
692 static inline int
693 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
694 {
695 int formatvec;
696 struct sigcontext context;
697 int err = 0;
698
699 siginfo_build_tests();
700
701 /* Always make any pending restarted system calls return -EINTR */
702 current->restart_block.fn = do_no_restart_syscall;
703
704 /* get previous context */
705 if (copy_from_user(&context, usc, sizeof(context)))
706 goto badframe;
707
708 /* restore passed registers */
709 regs->d0 = context.sc_d0;
710 regs->d1 = context.sc_d1;
711 regs->a0 = context.sc_a0;
712 regs->a1 = context.sc_a1;
713 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
714 regs->pc = context.sc_pc;
715 regs->orig_d0 = -1; /* disable syscall checks */
716 wrusp(context.sc_usp);
717 formatvec = context.sc_formatvec;
718
719 err = restore_fpu_state(&context);
720
721 if (err || mangle_kernel_stack(regs, formatvec, fp))
722 goto badframe;
723
724 return 0;
725
726 badframe:
727 return 1;
728 }
729
730 static inline int
731 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
732 struct ucontext __user *uc)
733 {
734 int temp;
735 greg_t __user *gregs = uc->uc_mcontext.gregs;
736 unsigned long usp;
737 int err;
738
739 /* Always make any pending restarted system calls return -EINTR */
740 current->restart_block.fn = do_no_restart_syscall;
741
742 err = __get_user(temp, &uc->uc_mcontext.version);
743 if (temp != MCONTEXT_VERSION)
744 goto badframe;
745 /* restore passed registers */
746 err |= __get_user(regs->d0, &gregs[0]);
747 err |= __get_user(regs->d1, &gregs[1]);
748 err |= __get_user(regs->d2, &gregs[2]);
749 err |= __get_user(regs->d3, &gregs[3]);
750 err |= __get_user(regs->d4, &gregs[4]);
751 err |= __get_user(regs->d5, &gregs[5]);
752 err |= __get_user(sw->d6, &gregs[6]);
753 err |= __get_user(sw->d7, &gregs[7]);
754 err |= __get_user(regs->a0, &gregs[8]);
755 err |= __get_user(regs->a1, &gregs[9]);
756 err |= __get_user(regs->a2, &gregs[10]);
757 err |= __get_user(sw->a3, &gregs[11]);
758 err |= __get_user(sw->a4, &gregs[12]);
759 err |= __get_user(sw->a5, &gregs[13]);
760 err |= __get_user(sw->a6, &gregs[14]);
761 err |= __get_user(usp, &gregs[15]);
762 wrusp(usp);
763 err |= __get_user(regs->pc, &gregs[16]);
764 err |= __get_user(temp, &gregs[17]);
765 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
766 regs->orig_d0 = -1; /* disable syscall checks */
767 err |= __get_user(temp, &uc->uc_formatvec);
768
769 err |= rt_restore_fpu_state(uc);
770 err |= restore_altstack(&uc->uc_stack);
771
772 if (err)
773 goto badframe;
774
775 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
776 goto badframe;
777
778 return 0;
779
780 badframe:
781 return 1;
782 }
783
784 asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
785 {
786 unsigned long usp = rdusp();
787 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
788 sigset_t set;
789
790 if (!access_ok(frame, sizeof(*frame)))
791 goto badframe;
792 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
793 (_NSIG_WORDS > 1 &&
794 __copy_from_user(&set.sig[1], &frame->extramask,
795 sizeof(frame->extramask))))
796 goto badframe;
797
798 set_current_blocked(&set);
799
800 if (restore_sigcontext(regs, &frame->sc, frame + 1))
801 goto badframe;
802 return regs->d0;
803
804 badframe:
805 force_sig(SIGSEGV, current);
806 return 0;
807 }
808
809 asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
810 {
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(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 ksignal *ksig, size_t frame_size)
879 {
880 unsigned long usp = sigsp(rdusp(), ksig);
881
882 return (void __user *)((usp - frame_size) & -8UL);
883 }
884
885 static int setup_frame(struct ksignal *ksig, sigset_t *set,
886 struct pt_regs *regs)
887 {
888 struct sigframe __user *frame;
889 int fsize = frame_extra_sizes(regs->format);
890 struct sigcontext context;
891 int err = 0, sig = ksig->sig;
892
893 if (fsize < 0) {
894 pr_debug("setup_frame: Unknown frame format %#x\n",
895 regs->format);
896 return -EFAULT;
897 }
898
899 frame = get_sigframe(ksig, sizeof(*frame) + fsize);
900
901 if (fsize)
902 err |= copy_to_user (frame + 1, regs + 1, fsize);
903
904 err |= __put_user(sig, &frame->sig);
905
906 err |= __put_user(regs->vector, &frame->code);
907 err |= __put_user(&frame->sc, &frame->psc);
908
909 if (_NSIG_WORDS > 1)
910 err |= copy_to_user(frame->extramask, &set->sig[1],
911 sizeof(frame->extramask));
912
913 setup_sigcontext(&context, regs, set->sig[0]);
914 err |= copy_to_user (&frame->sc, &context, sizeof(context));
915
916 /* Set up to return from userspace. */
917 #ifdef CONFIG_MMU
918 err |= __put_user(frame->retcode, &frame->pretcode);
919 /* moveq #,d0; trap #0 */
920 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
921 (long __user *)(frame->retcode));
922 #else
923 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
924 #endif
925
926 if (err)
927 return -EFAULT;
928
929 push_cache ((unsigned long) &frame->retcode);
930
931 /*
932 * Set up registers for signal handler. All the state we are about
933 * to destroy is successfully copied to sigframe.
934 */
935 wrusp ((unsigned long) frame);
936 regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
937 adjustformat(regs);
938
939 /*
940 * This is subtle; if we build more than one sigframe, all but the
941 * first one will see frame format 0 and have fsize == 0, so we won't
942 * screw stkadj.
943 */
944 if (fsize)
945 regs->stkadj = fsize;
946
947 /* Prepare to skip over the extra stuff in the exception frame. */
948 if (regs->stkadj) {
949 struct pt_regs *tregs =
950 (struct pt_regs *)((ulong)regs + regs->stkadj);
951 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
952 /* This must be copied with decreasing addresses to
953 handle overlaps. */
954 tregs->vector = 0;
955 tregs->format = 0;
956 tregs->pc = regs->pc;
957 tregs->sr = regs->sr;
958 }
959 return 0;
960 }
961
962 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
963 struct pt_regs *regs)
964 {
965 struct rt_sigframe __user *frame;
966 int fsize = frame_extra_sizes(regs->format);
967 int err = 0, sig = ksig->sig;
968
969 if (fsize < 0) {
970 pr_debug("setup_frame: Unknown frame format %#x\n",
971 regs->format);
972 return -EFAULT;
973 }
974
975 frame = get_sigframe(ksig, sizeof(*frame));
976
977 if (fsize)
978 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
979
980 err |= __put_user(sig, &frame->sig);
981 err |= __put_user(&frame->info, &frame->pinfo);
982 err |= __put_user(&frame->uc, &frame->puc);
983 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
984
985 /* Create the ucontext. */
986 err |= __put_user(0, &frame->uc.uc_flags);
987 err |= __put_user(NULL, &frame->uc.uc_link);
988 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
989 err |= rt_setup_ucontext(&frame->uc, regs);
990 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
991
992 /* Set up to return from userspace. */
993 #ifdef CONFIG_MMU
994 err |= __put_user(frame->retcode, &frame->pretcode);
995 #ifdef __mcoldfire__
996 /* movel #__NR_rt_sigreturn,d0; trap #0 */
997 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
998 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
999 (long __user *)(frame->retcode + 4));
1000 #else
1001 /* moveq #,d0; notb d0; trap #0 */
1002 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
1003 (long __user *)(frame->retcode + 0));
1004 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1005 #endif
1006 #else
1007 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
1008 #endif /* CONFIG_MMU */
1009
1010 if (err)
1011 return -EFAULT;
1012
1013 push_cache ((unsigned long) &frame->retcode);
1014
1015 /*
1016 * Set up registers for signal handler. All the state we are about
1017 * to destroy is successfully copied to sigframe.
1018 */
1019 wrusp ((unsigned long) frame);
1020 regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
1021 adjustformat(regs);
1022
1023 /*
1024 * This is subtle; if we build more than one sigframe, all but the
1025 * first one will see frame format 0 and have fsize == 0, so we won't
1026 * screw stkadj.
1027 */
1028 if (fsize)
1029 regs->stkadj = fsize;
1030
1031 /* Prepare to skip over the extra stuff in the exception frame. */
1032 if (regs->stkadj) {
1033 struct pt_regs *tregs =
1034 (struct pt_regs *)((ulong)regs + regs->stkadj);
1035 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
1036 /* This must be copied with decreasing addresses to
1037 handle overlaps. */
1038 tregs->vector = 0;
1039 tregs->format = 0;
1040 tregs->pc = regs->pc;
1041 tregs->sr = regs->sr;
1042 }
1043 return 0;
1044 }
1045
1046 static inline void
1047 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1048 {
1049 switch (regs->d0) {
1050 case -ERESTARTNOHAND:
1051 if (!has_handler)
1052 goto do_restart;
1053 regs->d0 = -EINTR;
1054 break;
1055
1056 case -ERESTART_RESTARTBLOCK:
1057 if (!has_handler) {
1058 regs->d0 = __NR_restart_syscall;
1059 regs->pc -= 2;
1060 break;
1061 }
1062 regs->d0 = -EINTR;
1063 break;
1064
1065 case -ERESTARTSYS:
1066 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1067 regs->d0 = -EINTR;
1068 break;
1069 }
1070 /* fallthrough */
1071 case -ERESTARTNOINTR:
1072 do_restart:
1073 regs->d0 = regs->orig_d0;
1074 regs->pc -= 2;
1075 break;
1076 }
1077 }
1078
1079 /*
1080 * OK, we're invoking a handler
1081 */
1082 static void
1083 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
1084 {
1085 sigset_t *oldset = sigmask_to_save();
1086 int err;
1087 /* are we from a system call? */
1088 if (regs->orig_d0 >= 0)
1089 /* If so, check system call restarting.. */
1090 handle_restart(regs, &ksig->ka, 1);
1091
1092 /* set up the stack frame */
1093 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
1094 err = setup_rt_frame(ksig, oldset, regs);
1095 else
1096 err = setup_frame(ksig, oldset, regs);
1097
1098 signal_setup_done(err, ksig, 0);
1099
1100 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1101 regs->sr &= ~0x8000;
1102 send_sig(SIGTRAP, current, 1);
1103 }
1104 }
1105
1106 /*
1107 * Note that 'init' is a special process: it doesn't get signals it doesn't
1108 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1109 * mistake.
1110 */
1111 static void do_signal(struct pt_regs *regs)
1112 {
1113 struct ksignal ksig;
1114
1115 current->thread.esp0 = (unsigned long) regs;
1116
1117 if (get_signal(&ksig)) {
1118 /* Whee! Actually deliver the signal. */
1119 handle_signal(&ksig, regs);
1120 return;
1121 }
1122
1123 /* Did we come from a system call? */
1124 if (regs->orig_d0 >= 0)
1125 /* Restart the system call - no handlers present */
1126 handle_restart(regs, NULL, 0);
1127
1128 /* If there's no signal to deliver, we just restore the saved mask. */
1129 restore_saved_sigmask();
1130 }
1131
1132 void do_notify_resume(struct pt_regs *regs)
1133 {
1134 if (test_thread_flag(TIF_SIGPENDING))
1135 do_signal(regs);
1136
1137 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
1138 tracehook_notify_resume(regs);
1139 }
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