?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mm/hmm.c: remove superfluous RCU protection around radix tree lookup
[linux/fpc-iii.git] / arch / m68k / kernel / signal.c
blobf7cd5ecfacd3b9465fcaec40eeee7e7ff1b23689
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 /* This needs to be tested on m68k as it has a lesser
580 * alignment requirment than x86 and that can cause surprises.
581 */
582
583 /* This is part of the ABI and can never change in size: */
584 BUILD_BUG_ON(sizeof(siginfo_t) != 128);
585
586 /* Ensure the know fields never change in location */
587 BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0);
588 BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4);
589 BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8);
590
591 /* _kill */
592 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0C);
593 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
594
595 /* _timer */
596 BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0C);
597 BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10);
598 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
599
600 /* _rt */
601 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0C);
602 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
603 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14);
604
605 /* _sigchld */
606 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0C);
607 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10);
608 BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14);
609 BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18);
610 BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1C);
611
612 /* _sigfault */
613 BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0C);
614
615 /* _sigfault._mcerr */
616 BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10);
617
618 /* _sigfault._addr_bnd */
619 BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12);
620 BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16);
621
622 /* _sigfault._addr_pkey */
623 BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12);
624
625 /* _sigpoll */
626 BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0C);
627 BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10);
628
629 /* _sigsys */
630 BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0C);
631 BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10);
632 BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14);
633
634 /* any new si_fields should be added here */
635 }
636
637 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
638 void __user *fp)
639 {
640 int fsize = frame_extra_sizes(formatvec >> 12);
641 if (fsize < 0) {
642 /*
643 * user process trying to return with weird frame format
644 */
645 pr_debug("user process returning with weird frame format\n");
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 siginfo_build_tests();
699
700 /* Always make any pending restarted system calls return -EINTR */
701 current->restart_block.fn = do_no_restart_syscall;
702
703 /* get previous context */
704 if (copy_from_user(&context, usc, sizeof(context)))
705 goto badframe;
706
707 /* restore passed registers */
708 regs->d0 = context.sc_d0;
709 regs->d1 = context.sc_d1;
710 regs->a0 = context.sc_a0;
711 regs->a1 = context.sc_a1;
712 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
713 regs->pc = context.sc_pc;
714 regs->orig_d0 = -1; /* disable syscall checks */
715 wrusp(context.sc_usp);
716 formatvec = context.sc_formatvec;
717
718 err = restore_fpu_state(&context);
719
720 if (err || mangle_kernel_stack(regs, formatvec, fp))
721 goto badframe;
722
723 return 0;
724
725 badframe:
726 return 1;
727 }
728
729 static inline int
730 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
731 struct ucontext __user *uc)
732 {
733 int temp;
734 greg_t __user *gregs = uc->uc_mcontext.gregs;
735 unsigned long usp;
736 int err;
737
738 /* Always make any pending restarted system calls return -EINTR */
739 current->restart_block.fn = do_no_restart_syscall;
740
741 err = __get_user(temp, &uc->uc_mcontext.version);
742 if (temp != MCONTEXT_VERSION)
743 goto badframe;
744 /* restore passed registers */
745 err |= __get_user(regs->d0, &gregs[0]);
746 err |= __get_user(regs->d1, &gregs[1]);
747 err |= __get_user(regs->d2, &gregs[2]);
748 err |= __get_user(regs->d3, &gregs[3]);
749 err |= __get_user(regs->d4, &gregs[4]);
750 err |= __get_user(regs->d5, &gregs[5]);
751 err |= __get_user(sw->d6, &gregs[6]);
752 err |= __get_user(sw->d7, &gregs[7]);
753 err |= __get_user(regs->a0, &gregs[8]);
754 err |= __get_user(regs->a1, &gregs[9]);
755 err |= __get_user(regs->a2, &gregs[10]);
756 err |= __get_user(sw->a3, &gregs[11]);
757 err |= __get_user(sw->a4, &gregs[12]);
758 err |= __get_user(sw->a5, &gregs[13]);
759 err |= __get_user(sw->a6, &gregs[14]);
760 err |= __get_user(usp, &gregs[15]);
761 wrusp(usp);
762 err |= __get_user(regs->pc, &gregs[16]);
763 err |= __get_user(temp, &gregs[17]);
764 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
765 regs->orig_d0 = -1; /* disable syscall checks */
766 err |= __get_user(temp, &uc->uc_formatvec);
767
768 err |= rt_restore_fpu_state(uc);
769 err |= restore_altstack(&uc->uc_stack);
770
771 if (err)
772 goto badframe;
773
774 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
775 goto badframe;
776
777 return 0;
778
779 badframe:
780 return 1;
781 }
782
783 asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
784 {
785 unsigned long usp = rdusp();
786 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
787 sigset_t set;
788
789 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
790 goto badframe;
791 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
792 (_NSIG_WORDS > 1 &&
793 __copy_from_user(&set.sig[1], &frame->extramask,
794 sizeof(frame->extramask))))
795 goto badframe;
796
797 set_current_blocked(&set);
798
799 if (restore_sigcontext(regs, &frame->sc, frame + 1))
800 goto badframe;
801 return regs->d0;
802
803 badframe:
804 force_sig(SIGSEGV, current);
805 return 0;
806 }
807
808 asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
809 {
810 unsigned long usp = rdusp();
811 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
812 sigset_t set;
813
814 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
815 goto badframe;
816 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
817 goto badframe;
818
819 set_current_blocked(&set);
820
821 if (rt_restore_ucontext(regs, sw, &frame->uc))
822 goto badframe;
823 return regs->d0;
824
825 badframe:
826 force_sig(SIGSEGV, current);
827 return 0;
828 }
829
830 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
831 unsigned long mask)
832 {
833 sc->sc_mask = mask;
834 sc->sc_usp = rdusp();
835 sc->sc_d0 = regs->d0;
836 sc->sc_d1 = regs->d1;
837 sc->sc_a0 = regs->a0;
838 sc->sc_a1 = regs->a1;
839 sc->sc_sr = regs->sr;
840 sc->sc_pc = regs->pc;
841 sc->sc_formatvec = regs->format << 12 | regs->vector;
842 save_a5_state(sc, regs);
843 save_fpu_state(sc, regs);
844 }
845
846 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
847 {
848 struct switch_stack *sw = (struct switch_stack *)regs - 1;
849 greg_t __user *gregs = uc->uc_mcontext.gregs;
850 int err = 0;
851
852 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
853 err |= __put_user(regs->d0, &gregs[0]);
854 err |= __put_user(regs->d1, &gregs[1]);
855 err |= __put_user(regs->d2, &gregs[2]);
856 err |= __put_user(regs->d3, &gregs[3]);
857 err |= __put_user(regs->d4, &gregs[4]);
858 err |= __put_user(regs->d5, &gregs[5]);
859 err |= __put_user(sw->d6, &gregs[6]);
860 err |= __put_user(sw->d7, &gregs[7]);
861 err |= __put_user(regs->a0, &gregs[8]);
862 err |= __put_user(regs->a1, &gregs[9]);
863 err |= __put_user(regs->a2, &gregs[10]);
864 err |= __put_user(sw->a3, &gregs[11]);
865 err |= __put_user(sw->a4, &gregs[12]);
866 err |= __put_user(sw->a5, &gregs[13]);
867 err |= __put_user(sw->a6, &gregs[14]);
868 err |= __put_user(rdusp(), &gregs[15]);
869 err |= __put_user(regs->pc, &gregs[16]);
870 err |= __put_user(regs->sr, &gregs[17]);
871 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
872 err |= rt_save_fpu_state(uc, regs);
873 return err;
874 }
875
876 static inline void __user *
877 get_sigframe(struct ksignal *ksig, size_t frame_size)
878 {
879 unsigned long usp = sigsp(rdusp(), ksig);
880
881 return (void __user *)((usp - frame_size) & -8UL);
882 }
883
884 static int setup_frame(struct ksignal *ksig, sigset_t *set,
885 struct pt_regs *regs)
886 {
887 struct sigframe __user *frame;
888 int fsize = frame_extra_sizes(regs->format);
889 struct sigcontext context;
890 int err = 0, sig = ksig->sig;
891
892 if (fsize < 0) {
893 pr_debug("setup_frame: Unknown frame format %#x\n",
894 regs->format);
895 return -EFAULT;
896 }
897
898 frame = get_sigframe(ksig, sizeof(*frame) + fsize);
899
900 if (fsize)
901 err |= copy_to_user (frame + 1, regs + 1, fsize);
902
903 err |= __put_user(sig, &frame->sig);
904
905 err |= __put_user(regs->vector, &frame->code);
906 err |= __put_user(&frame->sc, &frame->psc);
907
908 if (_NSIG_WORDS > 1)
909 err |= copy_to_user(frame->extramask, &set->sig[1],
910 sizeof(frame->extramask));
911
912 setup_sigcontext(&context, regs, set->sig[0]);
913 err |= copy_to_user (&frame->sc, &context, sizeof(context));
914
915 /* Set up to return from userspace. */
916 #ifdef CONFIG_MMU
917 err |= __put_user(frame->retcode, &frame->pretcode);
918 /* moveq #,d0; trap #0 */
919 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
920 (long __user *)(frame->retcode));
921 #else
922 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
923 #endif
924
925 if (err)
926 return -EFAULT;
927
928 push_cache ((unsigned long) &frame->retcode);
929
930 /*
931 * Set up registers for signal handler. All the state we are about
932 * to destroy is successfully copied to sigframe.
933 */
934 wrusp ((unsigned long) frame);
935 regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
936 adjustformat(regs);
937
938 /*
939 * This is subtle; if we build more than one sigframe, all but the
940 * first one will see frame format 0 and have fsize == 0, so we won't
941 * screw stkadj.
942 */
943 if (fsize)
944 regs->stkadj = fsize;
945
946 /* Prepare to skip over the extra stuff in the exception frame. */
947 if (regs->stkadj) {
948 struct pt_regs *tregs =
949 (struct pt_regs *)((ulong)regs + regs->stkadj);
950 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
951 /* This must be copied with decreasing addresses to
952 handle overlaps. */
953 tregs->vector = 0;
954 tregs->format = 0;
955 tregs->pc = regs->pc;
956 tregs->sr = regs->sr;
957 }
958 return 0;
959 }
960
961 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
962 struct pt_regs *regs)
963 {
964 struct rt_sigframe __user *frame;
965 int fsize = frame_extra_sizes(regs->format);
966 int err = 0, sig = ksig->sig;
967
968 if (fsize < 0) {
969 pr_debug("setup_frame: Unknown frame format %#x\n",
970 regs->format);
971 return -EFAULT;
972 }
973
974 frame = get_sigframe(ksig, sizeof(*frame));
975
976 if (fsize)
977 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
978
979 err |= __put_user(sig, &frame->sig);
980 err |= __put_user(&frame->info, &frame->pinfo);
981 err |= __put_user(&frame->uc, &frame->puc);
982 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
983
984 /* Create the ucontext. */
985 err |= __put_user(0, &frame->uc.uc_flags);
986 err |= __put_user(NULL, &frame->uc.uc_link);
987 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
988 err |= rt_setup_ucontext(&frame->uc, regs);
989 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
990
991 /* Set up to return from userspace. */
992 #ifdef CONFIG_MMU
993 err |= __put_user(frame->retcode, &frame->pretcode);
994 #ifdef __mcoldfire__
995 /* movel #__NR_rt_sigreturn,d0; trap #0 */
996 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
997 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
998 (long __user *)(frame->retcode + 4));
999 #else
1000 /* moveq #,d0; notb d0; trap #0 */
1001 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
1002 (long __user *)(frame->retcode + 0));
1003 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1004 #endif
1005 #else
1006 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
1007 #endif /* CONFIG_MMU */
1008
1009 if (err)
1010 return -EFAULT;
1011
1012 push_cache ((unsigned long) &frame->retcode);
1013
1014 /*
1015 * Set up registers for signal handler. All the state we are about
1016 * to destroy is successfully copied to sigframe.
1017 */
1018 wrusp ((unsigned long) frame);
1019 regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
1020 adjustformat(regs);
1021
1022 /*
1023 * This is subtle; if we build more than one sigframe, all but the
1024 * first one will see frame format 0 and have fsize == 0, so we won't
1025 * screw stkadj.
1026 */
1027 if (fsize)
1028 regs->stkadj = fsize;
1029
1030 /* Prepare to skip over the extra stuff in the exception frame. */
1031 if (regs->stkadj) {
1032 struct pt_regs *tregs =
1033 (struct pt_regs *)((ulong)regs + regs->stkadj);
1034 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
1035 /* This must be copied with decreasing addresses to
1036 handle overlaps. */
1037 tregs->vector = 0;
1038 tregs->format = 0;
1039 tregs->pc = regs->pc;
1040 tregs->sr = regs->sr;
1041 }
1042 return 0;
1043 }
1044
1045 static inline void
1046 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1047 {
1048 switch (regs->d0) {
1049 case -ERESTARTNOHAND:
1050 if (!has_handler)
1051 goto do_restart;
1052 regs->d0 = -EINTR;
1053 break;
1054
1055 case -ERESTART_RESTARTBLOCK:
1056 if (!has_handler) {
1057 regs->d0 = __NR_restart_syscall;
1058 regs->pc -= 2;
1059 break;
1060 }
1061 regs->d0 = -EINTR;
1062 break;
1063
1064 case -ERESTARTSYS:
1065 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1066 regs->d0 = -EINTR;
1067 break;
1068 }
1069 /* fallthrough */
1070 case -ERESTARTNOINTR:
1071 do_restart:
1072 regs->d0 = regs->orig_d0;
1073 regs->pc -= 2;
1074 break;
1075 }
1076 }
1077
1078 /*
1079 * OK, we're invoking a handler
1080 */
1081 static void
1082 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
1083 {
1084 sigset_t *oldset = sigmask_to_save();
1085 int err;
1086 /* are we from a system call? */
1087 if (regs->orig_d0 >= 0)
1088 /* If so, check system call restarting.. */
1089 handle_restart(regs, &ksig->ka, 1);
1090
1091 /* set up the stack frame */
1092 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
1093 err = setup_rt_frame(ksig, oldset, regs);
1094 else
1095 err = setup_frame(ksig, oldset, regs);
1096
1097 signal_setup_done(err, ksig, 0);
1098
1099 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1100 regs->sr &= ~0x8000;
1101 send_sig(SIGTRAP, current, 1);
1102 }
1103 }
1104
1105 /*
1106 * Note that 'init' is a special process: it doesn't get signals it doesn't
1107 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1108 * mistake.
1109 */
1110 static void do_signal(struct pt_regs *regs)
1111 {
1112 struct ksignal ksig;
1113
1114 current->thread.esp0 = (unsigned long) regs;
1115
1116 if (get_signal(&ksig)) {
1117 /* Whee! Actually deliver the signal. */
1118 handle_signal(&ksig, regs);
1119 return;
1120 }
1121
1122 /* Did we come from a system call? */
1123 if (regs->orig_d0 >= 0)
1124 /* Restart the system call - no handlers present */
1125 handle_restart(regs, NULL, 0);
1126
1127 /* If there's no signal to deliver, we just restore the saved mask. */
1128 restore_saved_sigmask();
1129 }
1130
1131 void do_notify_resume(struct pt_regs *regs)
1132 {
1133 if (test_thread_flag(TIF_SIGPENDING))
1134 do_signal(regs);
1135
1136 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
1137 tracehook_notify_resume(regs);
1138 }
Linux with added FPC-III support