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1#ifdef CONFIG_MMU
2#include "signal_mm.c"
3#else
4#include "signal_no.c"
5#endif
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/traps.h>
51#include <asm/ucontext.h>
52#include <asm/cacheflush.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_field(struct frame, un.fmt4)
65#endif
66
67static const int frame_size_change[16] = {
68 [1] = -1, /* sizeof_field(struct frame, un.fmt1), */
69 [2] = sizeof_field(struct frame, un.fmt2),
70 [3] = sizeof_field(struct frame, un.fmt3),
71 [4] = FMT4SIZE,
72 [5] = -1, /* sizeof_field(struct frame, un.fmt5), */
73 [6] = -1, /* sizeof_field(struct frame, un.fmt6), */
74 [7] = sizeof_field(struct frame, un.fmt7),
75 [8] = -1, /* sizeof_field(struct frame, un.fmt8), */
76 [9] = sizeof_field(struct frame, un.fmt9),
77 [10] = sizeof_field(struct frame, un.fmta),
78 [11] = sizeof_field(struct frame, un.fmtb),
79 [12] = -1, /* sizeof_field(struct frame, un.fmtc), */
80 [13] = -1, /* sizeof_field(struct frame, un.fmtd), */
81 [14] = -1, /* sizeof_field(struct frame, un.fmte), */
82 [15] = -1, /* sizeof_field(struct frame, un.fmtf), */
83};
84
85static inline int frame_extra_sizes(int f)
86{
87 return frame_size_change[f];
88}
89
90int fixup_exception(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
111static inline void push_cache (unsigned long vaddr)
112{
113 /*
114 * Using the old cache_push_v() was really a big waste.
115 *
116 * What we are trying to do is to flush 8 bytes to ram.
117 * Flushing 2 cache lines of 16 bytes is much cheaper than
118 * flushing 1 or 2 pages, as previously done in
119 * cache_push_v().
120 * Jes
121 */
122 if (CPU_IS_040) {
123 unsigned long temp;
124
125 __asm__ __volatile__ (".chip 68040\n\t"
126 "nop\n\t"
127 "ptestr (%1)\n\t"
128 "movec %%mmusr,%0\n\t"
129 ".chip 68k"
130 : "=r" (temp)
131 : "a" (vaddr));
132
133 temp &= PAGE_MASK;
134 temp |= vaddr & ~PAGE_MASK;
135
136 __asm__ __volatile__ (".chip 68040\n\t"
137 "nop\n\t"
138 "cpushl %%bc,(%0)\n\t"
139 ".chip 68k"
140 : : "a" (temp));
141 }
142 else if (CPU_IS_060) {
143 unsigned long temp;
144 __asm__ __volatile__ (".chip 68060\n\t"
145 "plpar (%0)\n\t"
146 ".chip 68k"
147 : "=a" (temp)
148 : "0" (vaddr));
149 __asm__ __volatile__ (".chip 68060\n\t"
150 "cpushl %%bc,(%0)\n\t"
151 ".chip 68k"
152 : : "a" (temp));
153 } else if (!CPU_IS_COLDFIRE) {
154 /*
155 * 68030/68020 have no writeback cache;
156 * still need to clear icache.
157 * Note that vaddr is guaranteed to be long word aligned.
158 */
159 unsigned long temp;
160 asm volatile ("movec %%cacr,%0" : "=r" (temp));
161 temp += 4;
162 asm volatile ("movec %0,%%caar\n\t"
163 "movec %1,%%cacr"
164 : : "r" (vaddr), "r" (temp));
165 asm volatile ("movec %0,%%caar\n\t"
166 "movec %1,%%cacr"
167 : : "r" (vaddr + 4), "r" (temp));
168 } else {
169 /* CPU_IS_COLDFIRE */
170#if defined(CONFIG_CACHE_COPYBACK)
171 flush_cf_dcache(0, DCACHE_MAX_ADDR);
172#endif
173 /* Invalidate instruction cache for the pushed bytes */
174 clear_cf_icache(vaddr, vaddr + 8);
175 }
176}
177
178static inline void adjustformat(struct pt_regs *regs)
179{
180}
181
182static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
183{
184}
185
186#else /* CONFIG_MMU */
187
188void ret_from_user_signal(void);
189void ret_from_user_rt_signal(void);
190
191static inline int frame_extra_sizes(int f)
192{
193 /* No frame size adjustments required on non-MMU CPUs */
194 return 0;
195}
196
197static inline void adjustformat(struct pt_regs *regs)
198{
199 /*
200 * set format byte to make stack appear modulo 4, which it will
201 * be when doing the rte
202 */
203 regs->format = 0x4;
204}
205
206static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
207{
208 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
209}
210
211static inline void push_cache(unsigned long vaddr)
212{
213}
214
215#endif /* CONFIG_MMU */
216
217/*
218 * Do a signal return; undo the signal stack.
219 *
220 * Keep the return code on the stack quadword aligned!
221 * That makes the cache flush below easier.
222 */
223
224struct sigframe
225{
226 char __user *pretcode;
227 int sig;
228 int code;
229 struct sigcontext __user *psc;
230 char retcode[8];
231 unsigned long extramask[_NSIG_WORDS-1];
232 struct sigcontext sc;
233};
234
235struct rt_sigframe
236{
237 char __user *pretcode;
238 int sig;
239 struct siginfo __user *pinfo;
240 void __user *puc;
241 char retcode[8];
242 struct siginfo info;
243 struct ucontext uc;
244};
245
246#define FPCONTEXT_SIZE 216
247#define uc_fpstate uc_filler[0]
248#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
249#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
250
251#ifdef CONFIG_FPU
252
253static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
254
255static inline int restore_fpu_state(struct sigcontext *sc)
256{
257 int err = 1;
258
259 if (FPU_IS_EMU) {
260 /* restore registers */
261 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
262 memcpy(current->thread.fp, sc->sc_fpregs, 24);
263 return 0;
264 }
265
266 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
267 /* Verify the frame format. */
268 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
269 (sc->sc_fpstate[0] != fpu_version))
270 goto out;
271 if (CPU_IS_020_OR_030) {
272 if (m68k_fputype & FPU_68881 &&
273 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
274 goto out;
275 if (m68k_fputype & FPU_68882 &&
276 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
277 goto out;
278 } else if (CPU_IS_040) {
279 if (!(sc->sc_fpstate[1] == 0x00 ||
280 sc->sc_fpstate[1] == 0x28 ||
281 sc->sc_fpstate[1] == 0x60))
282 goto out;
283 } else if (CPU_IS_060) {
284 if (!(sc->sc_fpstate[3] == 0x00 ||
285 sc->sc_fpstate[3] == 0x60 ||
286 sc->sc_fpstate[3] == 0xe0))
287 goto out;
288 } else if (CPU_IS_COLDFIRE) {
289 if (!(sc->sc_fpstate[0] == 0x00 ||
290 sc->sc_fpstate[0] == 0x05 ||
291 sc->sc_fpstate[0] == 0xe5))
292 goto out;
293 } else
294 goto out;
295
296 if (CPU_IS_COLDFIRE) {
297 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
298 "fmovel %1,%%fpcr\n\t"
299 "fmovel %2,%%fpsr\n\t"
300 "fmovel %3,%%fpiar"
301 : /* no outputs */
302 : "m" (sc->sc_fpregs[0]),
303 "m" (sc->sc_fpcntl[0]),
304 "m" (sc->sc_fpcntl[1]),
305 "m" (sc->sc_fpcntl[2]));
306 } else {
307 __asm__ volatile (".chip 68k/68881\n\t"
308 "fmovemx %0,%%fp0-%%fp1\n\t"
309 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
310 ".chip 68k"
311 : /* no outputs */
312 : "m" (*sc->sc_fpregs),
313 "m" (*sc->sc_fpcntl));
314 }
315 }
316
317 if (CPU_IS_COLDFIRE) {
318 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
319 } else {
320 __asm__ volatile (".chip 68k/68881\n\t"
321 "frestore %0\n\t"
322 ".chip 68k"
323 : : "m" (*sc->sc_fpstate));
324 }
325 err = 0;
326
327out:
328 return err;
329}
330
331static inline int rt_restore_fpu_state(struct ucontext __user *uc)
332{
333 unsigned char fpstate[FPCONTEXT_SIZE];
334 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
335 fpregset_t fpregs;
336 int err = 1;
337
338 if (FPU_IS_EMU) {
339 /* restore fpu control register */
340 if (__copy_from_user(current->thread.fpcntl,
341 uc->uc_mcontext.fpregs.f_fpcntl, 12))
342 goto out;
343 /* restore all other fpu register */
344 if (__copy_from_user(current->thread.fp,
345 uc->uc_mcontext.fpregs.f_fpregs, 96))
346 goto out;
347 return 0;
348 }
349
350 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
351 goto out;
352 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
353 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
354 context_size = fpstate[1];
355 /* Verify the frame format. */
356 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
357 (fpstate[0] != fpu_version))
358 goto out;
359 if (CPU_IS_020_OR_030) {
360 if (m68k_fputype & FPU_68881 &&
361 !(context_size == 0x18 || context_size == 0xb4))
362 goto out;
363 if (m68k_fputype & FPU_68882 &&
364 !(context_size == 0x38 || context_size == 0xd4))
365 goto out;
366 } else if (CPU_IS_040) {
367 if (!(context_size == 0x00 ||
368 context_size == 0x28 ||
369 context_size == 0x60))
370 goto out;
371 } else if (CPU_IS_060) {
372 if (!(fpstate[3] == 0x00 ||
373 fpstate[3] == 0x60 ||
374 fpstate[3] == 0xe0))
375 goto out;
376 } else if (CPU_IS_COLDFIRE) {
377 if (!(fpstate[3] == 0x00 ||
378 fpstate[3] == 0x05 ||
379 fpstate[3] == 0xe5))
380 goto out;
381 } else
382 goto out;
383 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
384 sizeof(fpregs)))
385 goto out;
386
387 if (CPU_IS_COLDFIRE) {
388 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
389 "fmovel %1,%%fpcr\n\t"
390 "fmovel %2,%%fpsr\n\t"
391 "fmovel %3,%%fpiar"
392 : /* no outputs */
393 : "m" (fpregs.f_fpregs[0]),
394 "m" (fpregs.f_fpcntl[0]),
395 "m" (fpregs.f_fpcntl[1]),
396 "m" (fpregs.f_fpcntl[2]));
397 } else {
398 __asm__ volatile (".chip 68k/68881\n\t"
399 "fmovemx %0,%%fp0-%%fp7\n\t"
400 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
401 ".chip 68k"
402 : /* no outputs */
403 : "m" (*fpregs.f_fpregs),
404 "m" (*fpregs.f_fpcntl));
405 }
406 }
407 if (context_size &&
408 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
409 context_size))
410 goto out;
411
412 if (CPU_IS_COLDFIRE) {
413 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
414 } else {
415 __asm__ volatile (".chip 68k/68881\n\t"
416 "frestore %0\n\t"
417 ".chip 68k"
418 : : "m" (*fpstate));
419 }
420 err = 0;
421
422out:
423 return err;
424}
425
426/*
427 * Set up a signal frame.
428 */
429static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
430{
431 if (FPU_IS_EMU) {
432 /* save registers */
433 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
434 memcpy(sc->sc_fpregs, current->thread.fp, 24);
435 return;
436 }
437
438 if (CPU_IS_COLDFIRE) {
439 __asm__ volatile ("fsave %0"
440 : : "m" (*sc->sc_fpstate) : "memory");
441 } else {
442 __asm__ volatile (".chip 68k/68881\n\t"
443 "fsave %0\n\t"
444 ".chip 68k"
445 : : "m" (*sc->sc_fpstate) : "memory");
446 }
447
448 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
449 fpu_version = sc->sc_fpstate[0];
450 if (CPU_IS_020_OR_030 && !regs->stkadj &&
451 regs->vector >= (VEC_FPBRUC * 4) &&
452 regs->vector <= (VEC_FPNAN * 4)) {
453 /* Clear pending exception in 68882 idle frame */
454 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
455 sc->sc_fpstate[0x38] |= 1 << 3;
456 }
457
458 if (CPU_IS_COLDFIRE) {
459 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
460 "fmovel %%fpcr,%1\n\t"
461 "fmovel %%fpsr,%2\n\t"
462 "fmovel %%fpiar,%3"
463 : "=m" (sc->sc_fpregs[0]),
464 "=m" (sc->sc_fpcntl[0]),
465 "=m" (sc->sc_fpcntl[1]),
466 "=m" (sc->sc_fpcntl[2])
467 : /* no inputs */
468 : "memory");
469 } else {
470 __asm__ volatile (".chip 68k/68881\n\t"
471 "fmovemx %%fp0-%%fp1,%0\n\t"
472 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
473 ".chip 68k"
474 : "=m" (*sc->sc_fpregs),
475 "=m" (*sc->sc_fpcntl)
476 : /* no inputs */
477 : "memory");
478 }
479 }
480}
481
482static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
483{
484 unsigned char fpstate[FPCONTEXT_SIZE];
485 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
486 int err = 0;
487
488 if (FPU_IS_EMU) {
489 /* save fpu control register */
490 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
491 current->thread.fpcntl, 12);
492 /* save all other fpu register */
493 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
494 current->thread.fp, 96);
495 return err;
496 }
497
498 if (CPU_IS_COLDFIRE) {
499 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
500 } else {
501 __asm__ volatile (".chip 68k/68881\n\t"
502 "fsave %0\n\t"
503 ".chip 68k"
504 : : "m" (*fpstate) : "memory");
505 }
506
507 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
508 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
509 fpregset_t fpregs;
510 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
511 context_size = fpstate[1];
512 fpu_version = fpstate[0];
513 if (CPU_IS_020_OR_030 && !regs->stkadj &&
514 regs->vector >= (VEC_FPBRUC * 4) &&
515 regs->vector <= (VEC_FPNAN * 4)) {
516 /* Clear pending exception in 68882 idle frame */
517 if (*(unsigned short *) fpstate == 0x1f38)
518 fpstate[0x38] |= 1 << 3;
519 }
520 if (CPU_IS_COLDFIRE) {
521 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
522 "fmovel %%fpcr,%1\n\t"
523 "fmovel %%fpsr,%2\n\t"
524 "fmovel %%fpiar,%3"
525 : "=m" (fpregs.f_fpregs[0]),
526 "=m" (fpregs.f_fpcntl[0]),
527 "=m" (fpregs.f_fpcntl[1]),
528 "=m" (fpregs.f_fpcntl[2])
529 : /* no inputs */
530 : "memory");
531 } else {
532 __asm__ volatile (".chip 68k/68881\n\t"
533 "fmovemx %%fp0-%%fp7,%0\n\t"
534 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
535 ".chip 68k"
536 : "=m" (*fpregs.f_fpregs),
537 "=m" (*fpregs.f_fpcntl)
538 : /* no inputs */
539 : "memory");
540 }
541 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
542 sizeof(fpregs));
543 }
544 if (context_size)
545 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
546 context_size);
547 return err;
548}
549
550#else /* CONFIG_FPU */
551
552/*
553 * For the case with no FPU configured these all do nothing.
554 */
555static inline int restore_fpu_state(struct sigcontext *sc)
556{
557 return 0;
558}
559
560static inline int rt_restore_fpu_state(struct ucontext __user *uc)
561{
562 return 0;
563}
564
565static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
566{
567}
568
569static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
570{
571 return 0;
572}
573
574#endif /* CONFIG_FPU */
575
576static inline void siginfo_build_tests(void)
577{
578 /*
579 * This needs to be tested on m68k as it has a lesser
580 * alignment requirement 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 known 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 /* _sigfault._perf */
626 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x10);
627 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x14);
628
629 /* _sigpoll */
630 BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c);
631 BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10);
632
633 /* _sigsys */
634 BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c);
635 BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10);
636 BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14);
637
638 /* any new si_fields should be added here */
639}
640
641static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
642 void __user *fp)
643{
644 int fsize = frame_extra_sizes(formatvec >> 12);
645 if (fsize < 0) {
646 /*
647 * user process trying to return with weird frame format
648 */
649 pr_debug("user process returning with weird frame format\n");
650 return 1;
651 }
652 if (!fsize) {
653 regs->format = formatvec >> 12;
654 regs->vector = formatvec & 0xfff;
655 } else {
656 struct switch_stack *sw = (struct switch_stack *)regs - 1;
657 /* yes, twice as much as max(sizeof(frame.un.fmt<x>)) */
658 unsigned long buf[sizeof_field(struct frame, un) / 2];
659
660 /* that'll make sure that expansion won't crap over data */
661 if (copy_from_user(buf + fsize / 4, fp, fsize))
662 return 1;
663
664 /* point of no return */
665 regs->format = formatvec >> 12;
666 regs->vector = formatvec & 0xfff;
667#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
668 __asm__ __volatile__ (
669#ifdef CONFIG_COLDFIRE
670 " movel %0,%/sp\n\t"
671 " bra ret_from_signal\n"
672#else
673 " movel %0,%/a0\n\t"
674 " subl %1,%/a0\n\t" /* make room on stack */
675 " movel %/a0,%/sp\n\t" /* set stack pointer */
676 /* move switch_stack and pt_regs */
677 "1: movel %0@+,%/a0@+\n\t"
678 " dbra %2,1b\n\t"
679 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
680 " lsrl #2,%1\n\t"
681 " subql #1,%1\n\t"
682 /* copy to the gap we'd made */
683 "2: movel %4@+,%/a0@+\n\t"
684 " dbra %1,2b\n\t"
685 " bral ret_from_signal\n"
686#endif
687 : /* no outputs, it doesn't ever return */
688 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
689 "n" (frame_offset), "a" (buf + fsize/4)
690 : "a0");
691#undef frame_offset
692 }
693 return 0;
694}
695
696static inline int
697restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
698{
699 int formatvec;
700 struct sigcontext context;
701 int err = 0;
702
703 siginfo_build_tests();
704
705 /* Always make any pending restarted system calls return -EINTR */
706 current->restart_block.fn = do_no_restart_syscall;
707
708 /* get previous context */
709 if (copy_from_user(&context, usc, sizeof(context)))
710 goto badframe;
711
712 /* restore passed registers */
713 regs->d0 = context.sc_d0;
714 regs->d1 = context.sc_d1;
715 regs->a0 = context.sc_a0;
716 regs->a1 = context.sc_a1;
717 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
718 regs->pc = context.sc_pc;
719 regs->orig_d0 = -1; /* disable syscall checks */
720 wrusp(context.sc_usp);
721 formatvec = context.sc_formatvec;
722
723 err = restore_fpu_state(&context);
724
725 if (err || mangle_kernel_stack(regs, formatvec, fp))
726 goto badframe;
727
728 return 0;
729
730badframe:
731 return 1;
732}
733
734static inline int
735rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
736 struct ucontext __user *uc)
737{
738 int temp;
739 greg_t __user *gregs = uc->uc_mcontext.gregs;
740 unsigned long usp;
741 int err;
742
743 /* Always make any pending restarted system calls return -EINTR */
744 current->restart_block.fn = do_no_restart_syscall;
745
746 err = __get_user(temp, &uc->uc_mcontext.version);
747 if (temp != MCONTEXT_VERSION)
748 goto badframe;
749 /* restore passed registers */
750 err |= __get_user(regs->d0, &gregs[0]);
751 err |= __get_user(regs->d1, &gregs[1]);
752 err |= __get_user(regs->d2, &gregs[2]);
753 err |= __get_user(regs->d3, &gregs[3]);
754 err |= __get_user(regs->d4, &gregs[4]);
755 err |= __get_user(regs->d5, &gregs[5]);
756 err |= __get_user(sw->d6, &gregs[6]);
757 err |= __get_user(sw->d7, &gregs[7]);
758 err |= __get_user(regs->a0, &gregs[8]);
759 err |= __get_user(regs->a1, &gregs[9]);
760 err |= __get_user(regs->a2, &gregs[10]);
761 err |= __get_user(sw->a3, &gregs[11]);
762 err |= __get_user(sw->a4, &gregs[12]);
763 err |= __get_user(sw->a5, &gregs[13]);
764 err |= __get_user(sw->a6, &gregs[14]);
765 err |= __get_user(usp, &gregs[15]);
766 wrusp(usp);
767 err |= __get_user(regs->pc, &gregs[16]);
768 err |= __get_user(temp, &gregs[17]);
769 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
770 regs->orig_d0 = -1; /* disable syscall checks */
771 err |= __get_user(temp, &uc->uc_formatvec);
772
773 err |= rt_restore_fpu_state(uc);
774 err |= restore_altstack(&uc->uc_stack);
775
776 if (err)
777 goto badframe;
778
779 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
780 goto badframe;
781
782 return 0;
783
784badframe:
785 return 1;
786}
787
788asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
789{
790 unsigned long usp = rdusp();
791 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
792 sigset_t set;
793
794 if (!access_ok(frame, sizeof(*frame)))
795 goto badframe;
796 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
797 (_NSIG_WORDS > 1 &&
798 __copy_from_user(&set.sig[1], &frame->extramask,
799 sizeof(frame->extramask))))
800 goto badframe;
801
802 set_current_blocked(&set);
803
804 if (restore_sigcontext(regs, &frame->sc, frame + 1))
805 goto badframe;
806 return regs->d0;
807
808badframe:
809 force_sig(SIGSEGV);
810 return 0;
811}
812
813asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
814{
815 unsigned long usp = rdusp();
816 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
817 sigset_t set;
818
819 if (!access_ok(frame, sizeof(*frame)))
820 goto badframe;
821 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
822 goto badframe;
823
824 set_current_blocked(&set);
825
826 if (rt_restore_ucontext(regs, sw, &frame->uc))
827 goto badframe;
828 return regs->d0;
829
830badframe:
831 force_sig(SIGSEGV);
832 return 0;
833}
834
835static inline struct pt_regs *rte_regs(struct pt_regs *regs)
836{
837 return (void *)regs + regs->stkadj;
838}
839
840static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
841 unsigned long mask)
842{
843 struct pt_regs *tregs = rte_regs(regs);
844 sc->sc_mask = mask;
845 sc->sc_usp = rdusp();
846 sc->sc_d0 = regs->d0;
847 sc->sc_d1 = regs->d1;
848 sc->sc_a0 = regs->a0;
849 sc->sc_a1 = regs->a1;
850 sc->sc_sr = tregs->sr;
851 sc->sc_pc = tregs->pc;
852 sc->sc_formatvec = tregs->format << 12 | tregs->vector;
853 save_a5_state(sc, regs);
854 save_fpu_state(sc, regs);
855}
856
857static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
858{
859 struct switch_stack *sw = (struct switch_stack *)regs - 1;
860 struct pt_regs *tregs = rte_regs(regs);
861 greg_t __user *gregs = uc->uc_mcontext.gregs;
862 int err = 0;
863
864 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
865 err |= __put_user(regs->d0, &gregs[0]);
866 err |= __put_user(regs->d1, &gregs[1]);
867 err |= __put_user(regs->d2, &gregs[2]);
868 err |= __put_user(regs->d3, &gregs[3]);
869 err |= __put_user(regs->d4, &gregs[4]);
870 err |= __put_user(regs->d5, &gregs[5]);
871 err |= __put_user(sw->d6, &gregs[6]);
872 err |= __put_user(sw->d7, &gregs[7]);
873 err |= __put_user(regs->a0, &gregs[8]);
874 err |= __put_user(regs->a1, &gregs[9]);
875 err |= __put_user(regs->a2, &gregs[10]);
876 err |= __put_user(sw->a3, &gregs[11]);
877 err |= __put_user(sw->a4, &gregs[12]);
878 err |= __put_user(sw->a5, &gregs[13]);
879 err |= __put_user(sw->a6, &gregs[14]);
880 err |= __put_user(rdusp(), &gregs[15]);
881 err |= __put_user(tregs->pc, &gregs[16]);
882 err |= __put_user(tregs->sr, &gregs[17]);
883 err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec);
884 err |= rt_save_fpu_state(uc, regs);
885 return err;
886}
887
888static inline void __user *
889get_sigframe(struct ksignal *ksig, size_t frame_size)
890{
891 unsigned long usp = sigsp(rdusp(), ksig);
892
893 return (void __user *)((usp - frame_size) & -8UL);
894}
895
896static int setup_frame(struct ksignal *ksig, sigset_t *set,
897 struct pt_regs *regs)
898{
899 struct sigframe __user *frame;
900 struct pt_regs *tregs = rte_regs(regs);
901 int fsize = frame_extra_sizes(tregs->format);
902 struct sigcontext context;
903 int err = 0, sig = ksig->sig;
904
905 if (fsize < 0) {
906 pr_debug("setup_frame: Unknown frame format %#x\n",
907 tregs->format);
908 return -EFAULT;
909 }
910
911 frame = get_sigframe(ksig, sizeof(*frame) + fsize);
912
913 if (fsize)
914 err |= copy_to_user (frame + 1, regs + 1, fsize);
915
916 err |= __put_user(sig, &frame->sig);
917
918 err |= __put_user(tregs->vector, &frame->code);
919 err |= __put_user(&frame->sc, &frame->psc);
920
921 if (_NSIG_WORDS > 1)
922 err |= copy_to_user(frame->extramask, &set->sig[1],
923 sizeof(frame->extramask));
924
925 setup_sigcontext(&context, regs, set->sig[0]);
926 err |= copy_to_user (&frame->sc, &context, sizeof(context));
927
928 /* Set up to return from userspace. */
929#ifdef CONFIG_MMU
930 err |= __put_user(frame->retcode, &frame->pretcode);
931 /* moveq #,d0; trap #0 */
932 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
933 (long __user *)(frame->retcode));
934#else
935 err |= __put_user((long) ret_from_user_signal,
936 (long __user *) &frame->pretcode);
937#endif
938
939 if (err)
940 return -EFAULT;
941
942 push_cache ((unsigned long) &frame->retcode);
943
944 /*
945 * This is subtle; if we build more than one sigframe, all but the
946 * first one will see frame format 0 and have fsize == 0, so we won't
947 * screw stkadj.
948 */
949 if (fsize) {
950 regs->stkadj = fsize;
951 tregs = rte_regs(regs);
952 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
953 tregs->vector = 0;
954 tregs->format = 0;
955 tregs->sr = regs->sr;
956 }
957
958 /*
959 * Set up registers for signal handler. All the state we are about
960 * to destroy is successfully copied to sigframe.
961 */
962 wrusp ((unsigned long) frame);
963 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
964 adjustformat(regs);
965
966 return 0;
967}
968
969static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
970 struct pt_regs *regs)
971{
972 struct rt_sigframe __user *frame;
973 struct pt_regs *tregs = rte_regs(regs);
974 int fsize = frame_extra_sizes(tregs->format);
975 int err = 0, sig = ksig->sig;
976
977 if (fsize < 0) {
978 pr_debug("setup_frame: Unknown frame format %#x\n",
979 regs->format);
980 return -EFAULT;
981 }
982
983 frame = get_sigframe(ksig, sizeof(*frame));
984
985 if (fsize)
986 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
987
988 err |= __put_user(sig, &frame->sig);
989 err |= __put_user(&frame->info, &frame->pinfo);
990 err |= __put_user(&frame->uc, &frame->puc);
991 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
992
993 /* Create the ucontext. */
994 err |= __put_user(0, &frame->uc.uc_flags);
995 err |= __put_user(NULL, &frame->uc.uc_link);
996 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
997 err |= rt_setup_ucontext(&frame->uc, regs);
998 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
999
1000 /* Set up to return from userspace. */
1001#ifdef CONFIG_MMU
1002 err |= __put_user(frame->retcode, &frame->pretcode);
1003#ifdef __mcoldfire__
1004 /* movel #__NR_rt_sigreturn,d0; trap #0 */
1005 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
1006 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
1007 (long __user *)(frame->retcode + 4));
1008#else
1009 /* moveq #,d0; notb d0; trap #0 */
1010 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
1011 (long __user *)(frame->retcode + 0));
1012 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1013#endif
1014#else
1015 err |= __put_user((long) ret_from_user_rt_signal,
1016 (long __user *) &frame->pretcode);
1017#endif /* CONFIG_MMU */
1018
1019 if (err)
1020 return -EFAULT;
1021
1022 push_cache ((unsigned long) &frame->retcode);
1023
1024 /*
1025 * This is subtle; if we build more than one sigframe, all but the
1026 * first one will see frame format 0 and have fsize == 0, so we won't
1027 * screw stkadj.
1028 */
1029 if (fsize) {
1030 regs->stkadj = fsize;
1031 tregs = rte_regs(regs);
1032 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
1033 tregs->vector = 0;
1034 tregs->format = 0;
1035 tregs->sr = regs->sr;
1036 }
1037
1038 /*
1039 * Set up registers for signal handler. All the state we are about
1040 * to destroy is successfully copied to sigframe.
1041 */
1042 wrusp ((unsigned long) frame);
1043 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
1044 adjustformat(regs);
1045 return 0;
1046}
1047
1048static inline void
1049handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1050{
1051 switch (regs->d0) {
1052 case -ERESTARTNOHAND:
1053 if (!has_handler)
1054 goto do_restart;
1055 regs->d0 = -EINTR;
1056 break;
1057
1058 case -ERESTART_RESTARTBLOCK:
1059 if (!has_handler) {
1060 regs->d0 = __NR_restart_syscall;
1061 regs->pc -= 2;
1062 break;
1063 }
1064 regs->d0 = -EINTR;
1065 break;
1066
1067 case -ERESTARTSYS:
1068 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1069 regs->d0 = -EINTR;
1070 break;
1071 }
1072 fallthrough;
1073 case -ERESTARTNOINTR:
1074 do_restart:
1075 regs->d0 = regs->orig_d0;
1076 regs->pc -= 2;
1077 break;
1078 }
1079}
1080
1081/*
1082 * OK, we're invoking a handler
1083 */
1084static void
1085handle_signal(struct ksignal *ksig, struct pt_regs *regs)
1086{
1087 sigset_t *oldset = sigmask_to_save();
1088 int err;
1089 /* are we from a system call? */
1090 if (regs->orig_d0 >= 0)
1091 /* If so, check system call restarting.. */
1092 handle_restart(regs, &ksig->ka, 1);
1093
1094 /* set up the stack frame */
1095 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
1096 err = setup_rt_frame(ksig, oldset, regs);
1097 else
1098 err = setup_frame(ksig, oldset, regs);
1099
1100 signal_setup_done(err, ksig, 0);
1101
1102 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1103 regs->sr &= ~0x8000;
1104 send_sig(SIGTRAP, current, 1);
1105 }
1106}
1107
1108/*
1109 * Note that 'init' is a special process: it doesn't get signals it doesn't
1110 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1111 * mistake.
1112 */
1113static void do_signal(struct pt_regs *regs)
1114{
1115 struct ksignal ksig;
1116
1117 current->thread.esp0 = (unsigned long) regs;
1118
1119 if (get_signal(&ksig)) {
1120 /* Whee! Actually deliver the signal. */
1121 handle_signal(&ksig, regs);
1122 return;
1123 }
1124
1125 /* Did we come from a system call? */
1126 if (regs->orig_d0 >= 0)
1127 /* Restart the system call - no handlers present */
1128 handle_restart(regs, NULL, 0);
1129
1130 /* If there's no signal to deliver, we just restore the saved mask. */
1131 restore_saved_sigmask();
1132}
1133
1134void do_notify_resume(struct pt_regs *regs)
1135{
1136 if (test_thread_flag(TIF_NOTIFY_SIGNAL) ||
1137 test_thread_flag(TIF_SIGPENDING))
1138 do_signal(regs);
1139
1140 if (test_thread_flag(TIF_NOTIFY_RESUME))
1141 tracehook_notify_resume(regs);
1142}