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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/resume_user_mode.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 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x18);
629
630 /* _sigpoll */
631 BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c);
632 BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10);
633
634 /* _sigsys */
635 BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c);
636 BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10);
637 BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14);
638
639 /* any new si_fields should be added here */
640}
641
642static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
643 void __user *fp)
644{
645 int extra = frame_extra_sizes(formatvec >> 12);
646 char buf[sizeof_field(struct frame, un)];
647
648 if (extra < 0) {
649 /*
650 * user process trying to return with weird frame format
651 */
652 pr_debug("user process returning with weird frame format\n");
653 return -1;
654 }
655 if (extra && copy_from_user(buf, fp, extra))
656 return -1;
657 regs->format = formatvec >> 12;
658 regs->vector = formatvec & 0xfff;
659 if (extra) {
660 void *p = (struct switch_stack *)regs - 1;
661 struct frame *new = (void *)regs - extra;
662 int size = sizeof(struct pt_regs)+sizeof(struct switch_stack);
663
664 memmove(p - extra, p, size);
665 memcpy(p - extra + size, buf, extra);
666 current->thread.esp0 = (unsigned long)&new->ptregs;
667#ifdef CONFIG_M68040
668 /* on 68040 complete pending writebacks if any */
669 if (new->ptregs.format == 7) // bus error frame
670 berr_040cleanup(new);
671#endif
672 }
673 return extra;
674}
675
676static inline int
677restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
678{
679 int formatvec;
680 struct sigcontext context;
681
682 siginfo_build_tests();
683
684 /* Always make any pending restarted system calls return -EINTR */
685 current->restart_block.fn = do_no_restart_syscall;
686
687 /* get previous context */
688 if (copy_from_user(&context, usc, sizeof(context)))
689 return -1;
690
691 /* restore passed registers */
692 regs->d0 = context.sc_d0;
693 regs->d1 = context.sc_d1;
694 regs->a0 = context.sc_a0;
695 regs->a1 = context.sc_a1;
696 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
697 regs->pc = context.sc_pc;
698 regs->orig_d0 = -1; /* disable syscall checks */
699 wrusp(context.sc_usp);
700 formatvec = context.sc_formatvec;
701
702 if (restore_fpu_state(&context))
703 return -1;
704
705 return mangle_kernel_stack(regs, formatvec, fp);
706}
707
708static inline int
709rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
710 struct ucontext __user *uc)
711{
712 int temp;
713 greg_t __user *gregs = uc->uc_mcontext.gregs;
714 unsigned long usp;
715 int err;
716
717 /* Always make any pending restarted system calls return -EINTR */
718 current->restart_block.fn = do_no_restart_syscall;
719
720 err = __get_user(temp, &uc->uc_mcontext.version);
721 if (temp != MCONTEXT_VERSION)
722 return -1;
723 /* restore passed registers */
724 err |= __get_user(regs->d0, &gregs[0]);
725 err |= __get_user(regs->d1, &gregs[1]);
726 err |= __get_user(regs->d2, &gregs[2]);
727 err |= __get_user(regs->d3, &gregs[3]);
728 err |= __get_user(regs->d4, &gregs[4]);
729 err |= __get_user(regs->d5, &gregs[5]);
730 err |= __get_user(sw->d6, &gregs[6]);
731 err |= __get_user(sw->d7, &gregs[7]);
732 err |= __get_user(regs->a0, &gregs[8]);
733 err |= __get_user(regs->a1, &gregs[9]);
734 err |= __get_user(regs->a2, &gregs[10]);
735 err |= __get_user(sw->a3, &gregs[11]);
736 err |= __get_user(sw->a4, &gregs[12]);
737 err |= __get_user(sw->a5, &gregs[13]);
738 err |= __get_user(sw->a6, &gregs[14]);
739 err |= __get_user(usp, &gregs[15]);
740 wrusp(usp);
741 err |= __get_user(regs->pc, &gregs[16]);
742 err |= __get_user(temp, &gregs[17]);
743 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
744 regs->orig_d0 = -1; /* disable syscall checks */
745 err |= __get_user(temp, &uc->uc_formatvec);
746
747 err |= rt_restore_fpu_state(uc);
748 err |= restore_altstack(&uc->uc_stack);
749
750 if (err)
751 return -1;
752
753 return mangle_kernel_stack(regs, temp, &uc->uc_extra);
754}
755
756asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
757{
758 unsigned long usp = rdusp();
759 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
760 sigset_t set;
761 int size;
762
763 if (!access_ok(frame, sizeof(*frame)))
764 goto badframe;
765 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
766 (_NSIG_WORDS > 1 &&
767 __copy_from_user(&set.sig[1], &frame->extramask,
768 sizeof(frame->extramask))))
769 goto badframe;
770
771 set_current_blocked(&set);
772
773 size = restore_sigcontext(regs, &frame->sc, frame + 1);
774 if (size < 0)
775 goto badframe;
776 return (void *)sw - size;
777
778badframe:
779 force_sig(SIGSEGV);
780 return sw;
781}
782
783asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
784{
785 unsigned long usp = rdusp();
786 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
787 sigset_t set;
788 int size;
789
790 if (!access_ok(frame, sizeof(*frame)))
791 goto badframe;
792 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
793 goto badframe;
794
795 set_current_blocked(&set);
796
797 size = rt_restore_ucontext(regs, sw, &frame->uc);
798 if (size < 0)
799 goto badframe;
800 return (void *)sw - size;
801
802badframe:
803 force_sig(SIGSEGV);
804 return sw;
805}
806
807static inline struct pt_regs *rte_regs(struct pt_regs *regs)
808{
809 return (void *)regs + regs->stkadj;
810}
811
812static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
813 unsigned long mask)
814{
815 struct pt_regs *tregs = rte_regs(regs);
816 sc->sc_mask = mask;
817 sc->sc_usp = rdusp();
818 sc->sc_d0 = regs->d0;
819 sc->sc_d1 = regs->d1;
820 sc->sc_a0 = regs->a0;
821 sc->sc_a1 = regs->a1;
822 sc->sc_sr = tregs->sr;
823 sc->sc_pc = tregs->pc;
824 sc->sc_formatvec = tregs->format << 12 | tregs->vector;
825 save_a5_state(sc, regs);
826 save_fpu_state(sc, regs);
827}
828
829static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
830{
831 struct switch_stack *sw = (struct switch_stack *)regs - 1;
832 struct pt_regs *tregs = rte_regs(regs);
833 greg_t __user *gregs = uc->uc_mcontext.gregs;
834 int err = 0;
835
836 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
837 err |= __put_user(regs->d0, &gregs[0]);
838 err |= __put_user(regs->d1, &gregs[1]);
839 err |= __put_user(regs->d2, &gregs[2]);
840 err |= __put_user(regs->d3, &gregs[3]);
841 err |= __put_user(regs->d4, &gregs[4]);
842 err |= __put_user(regs->d5, &gregs[5]);
843 err |= __put_user(sw->d6, &gregs[6]);
844 err |= __put_user(sw->d7, &gregs[7]);
845 err |= __put_user(regs->a0, &gregs[8]);
846 err |= __put_user(regs->a1, &gregs[9]);
847 err |= __put_user(regs->a2, &gregs[10]);
848 err |= __put_user(sw->a3, &gregs[11]);
849 err |= __put_user(sw->a4, &gregs[12]);
850 err |= __put_user(sw->a5, &gregs[13]);
851 err |= __put_user(sw->a6, &gregs[14]);
852 err |= __put_user(rdusp(), &gregs[15]);
853 err |= __put_user(tregs->pc, &gregs[16]);
854 err |= __put_user(tregs->sr, &gregs[17]);
855 err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec);
856 err |= rt_save_fpu_state(uc, regs);
857 return err;
858}
859
860static inline void __user *
861get_sigframe(struct ksignal *ksig, size_t frame_size)
862{
863 unsigned long usp = sigsp(rdusp(), ksig);
864
865 return (void __user *)((usp - frame_size) & -8UL);
866}
867
868static int setup_frame(struct ksignal *ksig, sigset_t *set,
869 struct pt_regs *regs)
870{
871 struct sigframe __user *frame;
872 struct pt_regs *tregs = rte_regs(regs);
873 int fsize = frame_extra_sizes(tregs->format);
874 struct sigcontext context;
875 int err = 0, sig = ksig->sig;
876
877 if (fsize < 0) {
878 pr_debug("setup_frame: Unknown frame format %#x\n",
879 tregs->format);
880 return -EFAULT;
881 }
882
883 frame = get_sigframe(ksig, sizeof(*frame) + fsize);
884
885 if (fsize)
886 err |= copy_to_user (frame + 1, regs + 1, fsize);
887
888 err |= __put_user(sig, &frame->sig);
889
890 err |= __put_user(tregs->vector, &frame->code);
891 err |= __put_user(&frame->sc, &frame->psc);
892
893 if (_NSIG_WORDS > 1)
894 err |= copy_to_user(frame->extramask, &set->sig[1],
895 sizeof(frame->extramask));
896
897 setup_sigcontext(&context, regs, set->sig[0]);
898 err |= copy_to_user (&frame->sc, &context, sizeof(context));
899
900 /* Set up to return from userspace. */
901#ifdef CONFIG_MMU
902 err |= __put_user(frame->retcode, &frame->pretcode);
903 /* moveq #,d0; trap #0 */
904 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
905 (long __user *)(frame->retcode));
906#else
907 err |= __put_user((long) ret_from_user_signal,
908 (long __user *) &frame->pretcode);
909#endif
910
911 if (err)
912 return -EFAULT;
913
914 push_cache ((unsigned long) &frame->retcode);
915
916 /*
917 * This is subtle; if we build more than one sigframe, all but the
918 * first one will see frame format 0 and have fsize == 0, so we won't
919 * screw stkadj.
920 */
921 if (fsize) {
922 regs->stkadj = fsize;
923 tregs = rte_regs(regs);
924 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
925 tregs->vector = 0;
926 tregs->format = 0;
927 tregs->sr = regs->sr;
928 }
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 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
936 adjustformat(regs);
937
938 return 0;
939}
940
941static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
942 struct pt_regs *regs)
943{
944 struct rt_sigframe __user *frame;
945 struct pt_regs *tregs = rte_regs(regs);
946 int fsize = frame_extra_sizes(tregs->format);
947 int err = 0, sig = ksig->sig;
948
949 if (fsize < 0) {
950 pr_debug("setup_frame: Unknown frame format %#x\n",
951 regs->format);
952 return -EFAULT;
953 }
954
955 frame = get_sigframe(ksig, sizeof(*frame));
956
957 if (fsize)
958 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
959
960 err |= __put_user(sig, &frame->sig);
961 err |= __put_user(&frame->info, &frame->pinfo);
962 err |= __put_user(&frame->uc, &frame->puc);
963 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
964
965 /* Create the ucontext. */
966 err |= __put_user(0, &frame->uc.uc_flags);
967 err |= __put_user(NULL, &frame->uc.uc_link);
968 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
969 err |= rt_setup_ucontext(&frame->uc, regs);
970 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
971
972 /* Set up to return from userspace. */
973#ifdef CONFIG_MMU
974 err |= __put_user(frame->retcode, &frame->pretcode);
975#ifdef __mcoldfire__
976 /* movel #__NR_rt_sigreturn,d0; trap #0 */
977 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
978 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
979 (long __user *)(frame->retcode + 4));
980#else
981 /* moveq #,d0; notb d0; trap #0 */
982 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
983 (long __user *)(frame->retcode + 0));
984 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
985#endif
986#else
987 err |= __put_user((long) ret_from_user_rt_signal,
988 (long __user *) &frame->pretcode);
989#endif /* CONFIG_MMU */
990
991 if (err)
992 return -EFAULT;
993
994 push_cache ((unsigned long) &frame->retcode);
995
996 /*
997 * This is subtle; if we build more than one sigframe, all but the
998 * first one will see frame format 0 and have fsize == 0, so we won't
999 * screw stkadj.
1000 */
1001 if (fsize) {
1002 regs->stkadj = fsize;
1003 tregs = rte_regs(regs);
1004 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
1005 tregs->vector = 0;
1006 tregs->format = 0;
1007 tregs->sr = regs->sr;
1008 }
1009
1010 /*
1011 * Set up registers for signal handler. All the state we are about
1012 * to destroy is successfully copied to sigframe.
1013 */
1014 wrusp ((unsigned long) frame);
1015 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
1016 adjustformat(regs);
1017 return 0;
1018}
1019
1020static inline void
1021handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1022{
1023 switch (regs->d0) {
1024 case -ERESTARTNOHAND:
1025 if (!has_handler)
1026 goto do_restart;
1027 regs->d0 = -EINTR;
1028 break;
1029
1030 case -ERESTART_RESTARTBLOCK:
1031 if (!has_handler) {
1032 regs->d0 = __NR_restart_syscall;
1033 regs->pc -= 2;
1034 break;
1035 }
1036 regs->d0 = -EINTR;
1037 break;
1038
1039 case -ERESTARTSYS:
1040 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1041 regs->d0 = -EINTR;
1042 break;
1043 }
1044 fallthrough;
1045 case -ERESTARTNOINTR:
1046 do_restart:
1047 regs->d0 = regs->orig_d0;
1048 regs->pc -= 2;
1049 break;
1050 }
1051}
1052
1053/*
1054 * OK, we're invoking a handler
1055 */
1056static void
1057handle_signal(struct ksignal *ksig, struct pt_regs *regs)
1058{
1059 sigset_t *oldset = sigmask_to_save();
1060 int err;
1061 /* are we from a system call? */
1062 if (regs->orig_d0 >= 0)
1063 /* If so, check system call restarting.. */
1064 handle_restart(regs, &ksig->ka, 1);
1065
1066 /* set up the stack frame */
1067 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
1068 err = setup_rt_frame(ksig, oldset, regs);
1069 else
1070 err = setup_frame(ksig, oldset, regs);
1071
1072 signal_setup_done(err, ksig, 0);
1073
1074 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1075 regs->sr &= ~0x8000;
1076 send_sig(SIGTRAP, current, 1);
1077 }
1078}
1079
1080/*
1081 * Note that 'init' is a special process: it doesn't get signals it doesn't
1082 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1083 * mistake.
1084 */
1085static void do_signal(struct pt_regs *regs)
1086{
1087 struct ksignal ksig;
1088
1089 current->thread.esp0 = (unsigned long) regs;
1090
1091 if (get_signal(&ksig)) {
1092 /* Whee! Actually deliver the signal. */
1093 handle_signal(&ksig, regs);
1094 return;
1095 }
1096
1097 /* Did we come from a system call? */
1098 if (regs->orig_d0 >= 0)
1099 /* Restart the system call - no handlers present */
1100 handle_restart(regs, NULL, 0);
1101
1102 /* If there's no signal to deliver, we just restore the saved mask. */
1103 restore_saved_sigmask();
1104}
1105
1106void do_notify_resume(struct pt_regs *regs)
1107{
1108 if (test_thread_flag(TIF_NOTIFY_SIGNAL) ||
1109 test_thread_flag(TIF_SIGPENDING))
1110 do_signal(regs);
1111
1112 if (test_thread_flag(TIF_NOTIFY_RESUME))
1113 resume_user_mode_work(regs);
1114}
1/*
2 * linux/arch/m68k/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11/*
12 * Linux/m68k support by Hamish Macdonald
13 *
14 * 68060 fixes by Jesper Skov
15 *
16 * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
17 *
18 * mathemu support by Roman Zippel
19 * (Note: fpstate in the signal context is completely ignored for the emulator
20 * and the internal floating point format is put on stack)
21 */
22
23/*
24 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
25 * Atari :-) Current limitation: Only one sigstack can be active at one time.
26 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
27 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
28 * signal handlers!
29 */
30
31#include <linux/sched.h>
32#include <linux/mm.h>
33#include <linux/kernel.h>
34#include <linux/signal.h>
35#include <linux/syscalls.h>
36#include <linux/errno.h>
37#include <linux/wait.h>
38#include <linux/ptrace.h>
39#include <linux/unistd.h>
40#include <linux/stddef.h>
41#include <linux/highuid.h>
42#include <linux/personality.h>
43#include <linux/tty.h>
44#include <linux/binfmts.h>
45#include <linux/module.h>
46#include <linux/tracehook.h>
47
48#include <asm/setup.h>
49#include <asm/uaccess.h>
50#include <asm/pgtable.h>
51#include <asm/traps.h>
52#include <asm/ucontext.h>
53
54#ifdef CONFIG_MMU
55
56/*
57 * Handle the slight differences in classic 68k and ColdFire trap frames.
58 */
59#ifdef CONFIG_COLDFIRE
60#define FORMAT 4
61#define FMT4SIZE 0
62#else
63#define FORMAT 0
64#define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
65#endif
66
67static const int frame_size_change[16] = {
68 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
69 [2] = sizeof(((struct frame *)0)->un.fmt2),
70 [3] = sizeof(((struct frame *)0)->un.fmt3),
71 [4] = FMT4SIZE,
72 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
73 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
74 [7] = sizeof(((struct frame *)0)->un.fmt7),
75 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
76 [9] = sizeof(((struct frame *)0)->un.fmt9),
77 [10] = sizeof(((struct frame *)0)->un.fmta),
78 [11] = sizeof(((struct frame *)0)->un.fmtb),
79 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
80 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
81 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
82 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
83};
84
85static inline int frame_extra_sizes(int f)
86{
87 return frame_size_change[f];
88}
89
90int handle_kernel_fault(struct pt_regs *regs)
91{
92 const struct exception_table_entry *fixup;
93 struct pt_regs *tregs;
94
95 /* Are we prepared to handle this kernel fault? */
96 fixup = search_exception_tables(regs->pc);
97 if (!fixup)
98 return 0;
99
100 /* Create a new four word stack frame, discarding the old one. */
101 regs->stkadj = frame_extra_sizes(regs->format);
102 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
103 tregs->vector = regs->vector;
104 tregs->format = FORMAT;
105 tregs->pc = fixup->fixup;
106 tregs->sr = regs->sr;
107
108 return 1;
109}
110
111void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
112{
113 if (regs->orig_d0 < 0)
114 return;
115 switch (regs->d0) {
116 case -ERESTARTNOHAND:
117 case -ERESTARTSYS:
118 case -ERESTARTNOINTR:
119 regs->d0 = regs->orig_d0;
120 regs->orig_d0 = -1;
121 regs->pc -= 2;
122 break;
123 }
124}
125
126static inline void push_cache (unsigned long vaddr)
127{
128 /*
129 * Using the old cache_push_v() was really a big waste.
130 *
131 * What we are trying to do is to flush 8 bytes to ram.
132 * Flushing 2 cache lines of 16 bytes is much cheaper than
133 * flushing 1 or 2 pages, as previously done in
134 * cache_push_v().
135 * Jes
136 */
137 if (CPU_IS_040) {
138 unsigned long temp;
139
140 __asm__ __volatile__ (".chip 68040\n\t"
141 "nop\n\t"
142 "ptestr (%1)\n\t"
143 "movec %%mmusr,%0\n\t"
144 ".chip 68k"
145 : "=r" (temp)
146 : "a" (vaddr));
147
148 temp &= PAGE_MASK;
149 temp |= vaddr & ~PAGE_MASK;
150
151 __asm__ __volatile__ (".chip 68040\n\t"
152 "nop\n\t"
153 "cpushl %%bc,(%0)\n\t"
154 ".chip 68k"
155 : : "a" (temp));
156 }
157 else if (CPU_IS_060) {
158 unsigned long temp;
159 __asm__ __volatile__ (".chip 68060\n\t"
160 "plpar (%0)\n\t"
161 ".chip 68k"
162 : "=a" (temp)
163 : "0" (vaddr));
164 __asm__ __volatile__ (".chip 68060\n\t"
165 "cpushl %%bc,(%0)\n\t"
166 ".chip 68k"
167 : : "a" (temp));
168 } else if (!CPU_IS_COLDFIRE) {
169 /*
170 * 68030/68020 have no writeback cache;
171 * still need to clear icache.
172 * Note that vaddr is guaranteed to be long word aligned.
173 */
174 unsigned long temp;
175 asm volatile ("movec %%cacr,%0" : "=r" (temp));
176 temp += 4;
177 asm volatile ("movec %0,%%caar\n\t"
178 "movec %1,%%cacr"
179 : : "r" (vaddr), "r" (temp));
180 asm volatile ("movec %0,%%caar\n\t"
181 "movec %1,%%cacr"
182 : : "r" (vaddr + 4), "r" (temp));
183 }
184}
185
186static inline void adjustformat(struct pt_regs *regs)
187{
188}
189
190static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
191{
192}
193
194#else /* CONFIG_MMU */
195
196void ret_from_user_signal(void);
197void ret_from_user_rt_signal(void);
198
199static inline int frame_extra_sizes(int f)
200{
201 /* No frame size adjustments required on non-MMU CPUs */
202 return 0;
203}
204
205static inline void adjustformat(struct pt_regs *regs)
206{
207 ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
208 /*
209 * set format byte to make stack appear modulo 4, which it will
210 * be when doing the rte
211 */
212 regs->format = 0x4;
213}
214
215static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
216{
217 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
218}
219
220static inline void push_cache(unsigned long vaddr)
221{
222}
223
224#endif /* CONFIG_MMU */
225
226/*
227 * Atomically swap in the new signal mask, and wait for a signal.
228 */
229asmlinkage int
230sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
231{
232 sigset_t blocked;
233 siginitset(&blocked, mask);
234 return sigsuspend(&blocked);
235}
236
237asmlinkage int
238sys_sigaction(int sig, const struct old_sigaction __user *act,
239 struct old_sigaction __user *oact)
240{
241 struct k_sigaction new_ka, old_ka;
242 int ret;
243
244 if (act) {
245 old_sigset_t mask;
246 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
247 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
248 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
249 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
250 __get_user(mask, &act->sa_mask))
251 return -EFAULT;
252 siginitset(&new_ka.sa.sa_mask, mask);
253 }
254
255 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
256
257 if (!ret && oact) {
258 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
259 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
260 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
261 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
262 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
263 return -EFAULT;
264 }
265
266 return ret;
267}
268
269asmlinkage int
270sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
271{
272 return do_sigaltstack(uss, uoss, rdusp());
273}
274
275
276/*
277 * Do a signal return; undo the signal stack.
278 *
279 * Keep the return code on the stack quadword aligned!
280 * That makes the cache flush below easier.
281 */
282
283struct sigframe
284{
285 char __user *pretcode;
286 int sig;
287 int code;
288 struct sigcontext __user *psc;
289 char retcode[8];
290 unsigned long extramask[_NSIG_WORDS-1];
291 struct sigcontext sc;
292};
293
294struct rt_sigframe
295{
296 char __user *pretcode;
297 int sig;
298 struct siginfo __user *pinfo;
299 void __user *puc;
300 char retcode[8];
301 struct siginfo info;
302 struct ucontext uc;
303};
304
305#define FPCONTEXT_SIZE 216
306#define uc_fpstate uc_filler[0]
307#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
308#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
309
310#ifdef CONFIG_FPU
311
312static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
313
314static inline int restore_fpu_state(struct sigcontext *sc)
315{
316 int err = 1;
317
318 if (FPU_IS_EMU) {
319 /* restore registers */
320 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
321 memcpy(current->thread.fp, sc->sc_fpregs, 24);
322 return 0;
323 }
324
325 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
326 /* Verify the frame format. */
327 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
328 (sc->sc_fpstate[0] != fpu_version))
329 goto out;
330 if (CPU_IS_020_OR_030) {
331 if (m68k_fputype & FPU_68881 &&
332 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
333 goto out;
334 if (m68k_fputype & FPU_68882 &&
335 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
336 goto out;
337 } else if (CPU_IS_040) {
338 if (!(sc->sc_fpstate[1] == 0x00 ||
339 sc->sc_fpstate[1] == 0x28 ||
340 sc->sc_fpstate[1] == 0x60))
341 goto out;
342 } else if (CPU_IS_060) {
343 if (!(sc->sc_fpstate[3] == 0x00 ||
344 sc->sc_fpstate[3] == 0x60 ||
345 sc->sc_fpstate[3] == 0xe0))
346 goto out;
347 } else if (CPU_IS_COLDFIRE) {
348 if (!(sc->sc_fpstate[0] == 0x00 ||
349 sc->sc_fpstate[0] == 0x05 ||
350 sc->sc_fpstate[0] == 0xe5))
351 goto out;
352 } else
353 goto out;
354
355 if (CPU_IS_COLDFIRE) {
356 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
357 "fmovel %1,%%fpcr\n\t"
358 "fmovel %2,%%fpsr\n\t"
359 "fmovel %3,%%fpiar"
360 : /* no outputs */
361 : "m" (sc->sc_fpregs[0]),
362 "m" (sc->sc_fpcntl[0]),
363 "m" (sc->sc_fpcntl[1]),
364 "m" (sc->sc_fpcntl[2]));
365 } else {
366 __asm__ volatile (".chip 68k/68881\n\t"
367 "fmovemx %0,%%fp0-%%fp1\n\t"
368 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
369 ".chip 68k"
370 : /* no outputs */
371 : "m" (*sc->sc_fpregs),
372 "m" (*sc->sc_fpcntl));
373 }
374 }
375
376 if (CPU_IS_COLDFIRE) {
377 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
378 } else {
379 __asm__ volatile (".chip 68k/68881\n\t"
380 "frestore %0\n\t"
381 ".chip 68k"
382 : : "m" (*sc->sc_fpstate));
383 }
384 err = 0;
385
386out:
387 return err;
388}
389
390static inline int rt_restore_fpu_state(struct ucontext __user *uc)
391{
392 unsigned char fpstate[FPCONTEXT_SIZE];
393 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
394 fpregset_t fpregs;
395 int err = 1;
396
397 if (FPU_IS_EMU) {
398 /* restore fpu control register */
399 if (__copy_from_user(current->thread.fpcntl,
400 uc->uc_mcontext.fpregs.f_fpcntl, 12))
401 goto out;
402 /* restore all other fpu register */
403 if (__copy_from_user(current->thread.fp,
404 uc->uc_mcontext.fpregs.f_fpregs, 96))
405 goto out;
406 return 0;
407 }
408
409 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
410 goto out;
411 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
412 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
413 context_size = fpstate[1];
414 /* Verify the frame format. */
415 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
416 (fpstate[0] != fpu_version))
417 goto out;
418 if (CPU_IS_020_OR_030) {
419 if (m68k_fputype & FPU_68881 &&
420 !(context_size == 0x18 || context_size == 0xb4))
421 goto out;
422 if (m68k_fputype & FPU_68882 &&
423 !(context_size == 0x38 || context_size == 0xd4))
424 goto out;
425 } else if (CPU_IS_040) {
426 if (!(context_size == 0x00 ||
427 context_size == 0x28 ||
428 context_size == 0x60))
429 goto out;
430 } else if (CPU_IS_060) {
431 if (!(fpstate[3] == 0x00 ||
432 fpstate[3] == 0x60 ||
433 fpstate[3] == 0xe0))
434 goto out;
435 } else if (CPU_IS_COLDFIRE) {
436 if (!(fpstate[3] == 0x00 ||
437 fpstate[3] == 0x05 ||
438 fpstate[3] == 0xe5))
439 goto out;
440 } else
441 goto out;
442 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
443 sizeof(fpregs)))
444 goto out;
445
446 if (CPU_IS_COLDFIRE) {
447 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
448 "fmovel %1,%%fpcr\n\t"
449 "fmovel %2,%%fpsr\n\t"
450 "fmovel %3,%%fpiar"
451 : /* no outputs */
452 : "m" (fpregs.f_fpregs[0]),
453 "m" (fpregs.f_fpcntl[0]),
454 "m" (fpregs.f_fpcntl[1]),
455 "m" (fpregs.f_fpcntl[2]));
456 } else {
457 __asm__ volatile (".chip 68k/68881\n\t"
458 "fmovemx %0,%%fp0-%%fp7\n\t"
459 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
460 ".chip 68k"
461 : /* no outputs */
462 : "m" (*fpregs.f_fpregs),
463 "m" (*fpregs.f_fpcntl));
464 }
465 }
466 if (context_size &&
467 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
468 context_size))
469 goto out;
470
471 if (CPU_IS_COLDFIRE) {
472 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
473 } else {
474 __asm__ volatile (".chip 68k/68881\n\t"
475 "frestore %0\n\t"
476 ".chip 68k"
477 : : "m" (*fpstate));
478 }
479 err = 0;
480
481out:
482 return err;
483}
484
485/*
486 * Set up a signal frame.
487 */
488static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
489{
490 if (FPU_IS_EMU) {
491 /* save registers */
492 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
493 memcpy(sc->sc_fpregs, current->thread.fp, 24);
494 return;
495 }
496
497 if (CPU_IS_COLDFIRE) {
498 __asm__ volatile ("fsave %0"
499 : : "m" (*sc->sc_fpstate) : "memory");
500 } else {
501 __asm__ volatile (".chip 68k/68881\n\t"
502 "fsave %0\n\t"
503 ".chip 68k"
504 : : "m" (*sc->sc_fpstate) : "memory");
505 }
506
507 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
508 fpu_version = sc->sc_fpstate[0];
509 if (CPU_IS_020_OR_030 &&
510 regs->vector >= (VEC_FPBRUC * 4) &&
511 regs->vector <= (VEC_FPNAN * 4)) {
512 /* Clear pending exception in 68882 idle frame */
513 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
514 sc->sc_fpstate[0x38] |= 1 << 3;
515 }
516
517 if (CPU_IS_COLDFIRE) {
518 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
519 "fmovel %%fpcr,%1\n\t"
520 "fmovel %%fpsr,%2\n\t"
521 "fmovel %%fpiar,%3"
522 : "=m" (sc->sc_fpregs[0]),
523 "=m" (sc->sc_fpcntl[0]),
524 "=m" (sc->sc_fpcntl[1]),
525 "=m" (sc->sc_fpcntl[2])
526 : /* no inputs */
527 : "memory");
528 } else {
529 __asm__ volatile (".chip 68k/68881\n\t"
530 "fmovemx %%fp0-%%fp1,%0\n\t"
531 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
532 ".chip 68k"
533 : "=m" (*sc->sc_fpregs),
534 "=m" (*sc->sc_fpcntl)
535 : /* no inputs */
536 : "memory");
537 }
538 }
539}
540
541static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
542{
543 unsigned char fpstate[FPCONTEXT_SIZE];
544 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
545 int err = 0;
546
547 if (FPU_IS_EMU) {
548 /* save fpu control register */
549 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
550 current->thread.fpcntl, 12);
551 /* save all other fpu register */
552 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
553 current->thread.fp, 96);
554 return err;
555 }
556
557 if (CPU_IS_COLDFIRE) {
558 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
559 } else {
560 __asm__ volatile (".chip 68k/68881\n\t"
561 "fsave %0\n\t"
562 ".chip 68k"
563 : : "m" (*fpstate) : "memory");
564 }
565
566 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
567 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
568 fpregset_t fpregs;
569 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
570 context_size = fpstate[1];
571 fpu_version = fpstate[0];
572 if (CPU_IS_020_OR_030 &&
573 regs->vector >= (VEC_FPBRUC * 4) &&
574 regs->vector <= (VEC_FPNAN * 4)) {
575 /* Clear pending exception in 68882 idle frame */
576 if (*(unsigned short *) fpstate == 0x1f38)
577 fpstate[0x38] |= 1 << 3;
578 }
579 if (CPU_IS_COLDFIRE) {
580 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
581 "fmovel %%fpcr,%1\n\t"
582 "fmovel %%fpsr,%2\n\t"
583 "fmovel %%fpiar,%3"
584 : "=m" (fpregs.f_fpregs[0]),
585 "=m" (fpregs.f_fpcntl[0]),
586 "=m" (fpregs.f_fpcntl[1]),
587 "=m" (fpregs.f_fpcntl[2])
588 : /* no inputs */
589 : "memory");
590 } else {
591 __asm__ volatile (".chip 68k/68881\n\t"
592 "fmovemx %%fp0-%%fp7,%0\n\t"
593 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
594 ".chip 68k"
595 : "=m" (*fpregs.f_fpregs),
596 "=m" (*fpregs.f_fpcntl)
597 : /* no inputs */
598 : "memory");
599 }
600 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
601 sizeof(fpregs));
602 }
603 if (context_size)
604 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
605 context_size);
606 return err;
607}
608
609#else /* CONFIG_FPU */
610
611/*
612 * For the case with no FPU configured these all do nothing.
613 */
614static inline int restore_fpu_state(struct sigcontext *sc)
615{
616 return 0;
617}
618
619static inline int rt_restore_fpu_state(struct ucontext __user *uc)
620{
621 return 0;
622}
623
624static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
625{
626}
627
628static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
629{
630 return 0;
631}
632
633#endif /* CONFIG_FPU */
634
635static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
636 void __user *fp)
637{
638 int fsize = frame_extra_sizes(formatvec >> 12);
639 if (fsize < 0) {
640 /*
641 * user process trying to return with weird frame format
642 */
643#ifdef DEBUG
644 printk("user process returning with weird frame format\n");
645#endif
646 return 1;
647 }
648 if (!fsize) {
649 regs->format = formatvec >> 12;
650 regs->vector = formatvec & 0xfff;
651 } else {
652 struct switch_stack *sw = (struct switch_stack *)regs - 1;
653 unsigned long buf[fsize / 2]; /* yes, twice as much */
654
655 /* that'll make sure that expansion won't crap over data */
656 if (copy_from_user(buf + fsize / 4, fp, fsize))
657 return 1;
658
659 /* point of no return */
660 regs->format = formatvec >> 12;
661 regs->vector = formatvec & 0xfff;
662#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
663 __asm__ __volatile__ (
664#ifdef CONFIG_COLDFIRE
665 " movel %0,%/sp\n\t"
666 " bra ret_from_signal\n"
667#else
668 " movel %0,%/a0\n\t"
669 " subl %1,%/a0\n\t" /* make room on stack */
670 " movel %/a0,%/sp\n\t" /* set stack pointer */
671 /* move switch_stack and pt_regs */
672 "1: movel %0@+,%/a0@+\n\t"
673 " dbra %2,1b\n\t"
674 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
675 " lsrl #2,%1\n\t"
676 " subql #1,%1\n\t"
677 /* copy to the gap we'd made */
678 "2: movel %4@+,%/a0@+\n\t"
679 " dbra %1,2b\n\t"
680 " bral ret_from_signal\n"
681#endif
682 : /* no outputs, it doesn't ever return */
683 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
684 "n" (frame_offset), "a" (buf + fsize/4)
685 : "a0");
686#undef frame_offset
687 }
688 return 0;
689}
690
691static inline int
692restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
693{
694 int formatvec;
695 struct sigcontext context;
696 int err = 0;
697
698 /* Always make any pending restarted system calls return -EINTR */
699 current_thread_info()->restart_block.fn = do_no_restart_syscall;
700
701 /* get previous context */
702 if (copy_from_user(&context, usc, sizeof(context)))
703 goto badframe;
704
705 /* restore passed registers */
706 regs->d0 = context.sc_d0;
707 regs->d1 = context.sc_d1;
708 regs->a0 = context.sc_a0;
709 regs->a1 = context.sc_a1;
710 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
711 regs->pc = context.sc_pc;
712 regs->orig_d0 = -1; /* disable syscall checks */
713 wrusp(context.sc_usp);
714 formatvec = context.sc_formatvec;
715
716 err = restore_fpu_state(&context);
717
718 if (err || mangle_kernel_stack(regs, formatvec, fp))
719 goto badframe;
720
721 return 0;
722
723badframe:
724 return 1;
725}
726
727static inline int
728rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
729 struct ucontext __user *uc)
730{
731 int temp;
732 greg_t __user *gregs = uc->uc_mcontext.gregs;
733 unsigned long usp;
734 int err;
735
736 /* Always make any pending restarted system calls return -EINTR */
737 current_thread_info()->restart_block.fn = do_no_restart_syscall;
738
739 err = __get_user(temp, &uc->uc_mcontext.version);
740 if (temp != MCONTEXT_VERSION)
741 goto badframe;
742 /* restore passed registers */
743 err |= __get_user(regs->d0, &gregs[0]);
744 err |= __get_user(regs->d1, &gregs[1]);
745 err |= __get_user(regs->d2, &gregs[2]);
746 err |= __get_user(regs->d3, &gregs[3]);
747 err |= __get_user(regs->d4, &gregs[4]);
748 err |= __get_user(regs->d5, &gregs[5]);
749 err |= __get_user(sw->d6, &gregs[6]);
750 err |= __get_user(sw->d7, &gregs[7]);
751 err |= __get_user(regs->a0, &gregs[8]);
752 err |= __get_user(regs->a1, &gregs[9]);
753 err |= __get_user(regs->a2, &gregs[10]);
754 err |= __get_user(sw->a3, &gregs[11]);
755 err |= __get_user(sw->a4, &gregs[12]);
756 err |= __get_user(sw->a5, &gregs[13]);
757 err |= __get_user(sw->a6, &gregs[14]);
758 err |= __get_user(usp, &gregs[15]);
759 wrusp(usp);
760 err |= __get_user(regs->pc, &gregs[16]);
761 err |= __get_user(temp, &gregs[17]);
762 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
763 regs->orig_d0 = -1; /* disable syscall checks */
764 err |= __get_user(temp, &uc->uc_formatvec);
765
766 err |= rt_restore_fpu_state(uc);
767
768 if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
769 goto badframe;
770
771 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
772 goto badframe;
773
774 return 0;
775
776badframe:
777 return 1;
778}
779
780asmlinkage int do_sigreturn(unsigned long __unused)
781{
782 struct switch_stack *sw = (struct switch_stack *) &__unused;
783 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
784 unsigned long usp = rdusp();
785 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
786 sigset_t set;
787
788 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
789 goto badframe;
790 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
791 (_NSIG_WORDS > 1 &&
792 __copy_from_user(&set.sig[1], &frame->extramask,
793 sizeof(frame->extramask))))
794 goto badframe;
795
796 set_current_blocked(&set);
797
798 if (restore_sigcontext(regs, &frame->sc, frame + 1))
799 goto badframe;
800 return regs->d0;
801
802badframe:
803 force_sig(SIGSEGV, current);
804 return 0;
805}
806
807asmlinkage int do_rt_sigreturn(unsigned long __unused)
808{
809 struct switch_stack *sw = (struct switch_stack *) &__unused;
810 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
811 unsigned long usp = rdusp();
812 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
813 sigset_t set;
814
815 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
816 goto badframe;
817 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
818 goto badframe;
819
820 set_current_blocked(&set);
821
822 if (rt_restore_ucontext(regs, sw, &frame->uc))
823 goto badframe;
824 return regs->d0;
825
826badframe:
827 force_sig(SIGSEGV, current);
828 return 0;
829}
830
831static 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
847static 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
877static inline void __user *
878get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
879{
880 unsigned long usp;
881
882 /* Default to using normal stack. */
883 usp = rdusp();
884
885 /* This is the X/Open sanctioned signal stack switching. */
886 if (ka->sa.sa_flags & SA_ONSTACK) {
887 if (!sas_ss_flags(usp))
888 usp = current->sas_ss_sp + current->sas_ss_size;
889 }
890 return (void __user *)((usp - frame_size) & -8UL);
891}
892
893static int setup_frame (int sig, struct k_sigaction *ka,
894 sigset_t *set, struct pt_regs *regs)
895{
896 struct sigframe __user *frame;
897 int fsize = frame_extra_sizes(regs->format);
898 struct sigcontext context;
899 int err = 0;
900
901 if (fsize < 0) {
902#ifdef DEBUG
903 printk ("setup_frame: Unknown frame format %#x\n",
904 regs->format);
905#endif
906 goto give_sigsegv;
907 }
908
909 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
910
911 if (fsize)
912 err |= copy_to_user (frame + 1, regs + 1, fsize);
913
914 err |= __put_user((current_thread_info()->exec_domain
915 && current_thread_info()->exec_domain->signal_invmap
916 && sig < 32
917 ? current_thread_info()->exec_domain->signal_invmap[sig]
918 : sig),
919 &frame->sig);
920
921 err |= __put_user(regs->vector, &frame->code);
922 err |= __put_user(&frame->sc, &frame->psc);
923
924 if (_NSIG_WORDS > 1)
925 err |= copy_to_user(frame->extramask, &set->sig[1],
926 sizeof(frame->extramask));
927
928 setup_sigcontext(&context, regs, set->sig[0]);
929 err |= copy_to_user (&frame->sc, &context, sizeof(context));
930
931 /* Set up to return from userspace. */
932#ifdef CONFIG_MMU
933 err |= __put_user(frame->retcode, &frame->pretcode);
934 /* moveq #,d0; trap #0 */
935 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
936 (long __user *)(frame->retcode));
937#else
938 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
939#endif
940
941 if (err)
942 goto give_sigsegv;
943
944 push_cache ((unsigned long) &frame->retcode);
945
946 /*
947 * Set up registers for signal handler. All the state we are about
948 * to destroy is successfully copied to sigframe.
949 */
950 wrusp ((unsigned long) frame);
951 regs->pc = (unsigned long) ka->sa.sa_handler;
952 adjustformat(regs);
953
954 /*
955 * This is subtle; if we build more than one sigframe, all but the
956 * first one will see frame format 0 and have fsize == 0, so we won't
957 * screw stkadj.
958 */
959 if (fsize)
960 regs->stkadj = fsize;
961
962 /* Prepare to skip over the extra stuff in the exception frame. */
963 if (regs->stkadj) {
964 struct pt_regs *tregs =
965 (struct pt_regs *)((ulong)regs + regs->stkadj);
966#ifdef DEBUG
967 printk("Performing stackadjust=%04x\n", regs->stkadj);
968#endif
969 /* This must be copied with decreasing addresses to
970 handle overlaps. */
971 tregs->vector = 0;
972 tregs->format = 0;
973 tregs->pc = regs->pc;
974 tregs->sr = regs->sr;
975 }
976 return 0;
977
978give_sigsegv:
979 force_sigsegv(sig, current);
980 return err;
981}
982
983static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
984 sigset_t *set, struct pt_regs *regs)
985{
986 struct rt_sigframe __user *frame;
987 int fsize = frame_extra_sizes(regs->format);
988 int err = 0;
989
990 if (fsize < 0) {
991#ifdef DEBUG
992 printk ("setup_frame: Unknown frame format %#x\n",
993 regs->format);
994#endif
995 goto give_sigsegv;
996 }
997
998 frame = get_sigframe(ka, regs, sizeof(*frame));
999
1000 if (fsize)
1001 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
1002
1003 err |= __put_user((current_thread_info()->exec_domain
1004 && current_thread_info()->exec_domain->signal_invmap
1005 && sig < 32
1006 ? current_thread_info()->exec_domain->signal_invmap[sig]
1007 : sig),
1008 &frame->sig);
1009 err |= __put_user(&frame->info, &frame->pinfo);
1010 err |= __put_user(&frame->uc, &frame->puc);
1011 err |= copy_siginfo_to_user(&frame->info, info);
1012
1013 /* Create the ucontext. */
1014 err |= __put_user(0, &frame->uc.uc_flags);
1015 err |= __put_user(NULL, &frame->uc.uc_link);
1016 err |= __put_user((void __user *)current->sas_ss_sp,
1017 &frame->uc.uc_stack.ss_sp);
1018 err |= __put_user(sas_ss_flags(rdusp()),
1019 &frame->uc.uc_stack.ss_flags);
1020 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
1021 err |= rt_setup_ucontext(&frame->uc, regs);
1022 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
1023
1024 /* Set up to return from userspace. */
1025#ifdef CONFIG_MMU
1026 err |= __put_user(frame->retcode, &frame->pretcode);
1027#ifdef __mcoldfire__
1028 /* movel #__NR_rt_sigreturn,d0; trap #0 */
1029 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
1030 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
1031 (long __user *)(frame->retcode + 4));
1032#else
1033 /* moveq #,d0; notb d0; trap #0 */
1034 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
1035 (long __user *)(frame->retcode + 0));
1036 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1037#endif
1038#else
1039 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
1040#endif /* CONFIG_MMU */
1041
1042 if (err)
1043 goto give_sigsegv;
1044
1045 push_cache ((unsigned long) &frame->retcode);
1046
1047 /*
1048 * Set up registers for signal handler. All the state we are about
1049 * to destroy is successfully copied to sigframe.
1050 */
1051 wrusp ((unsigned long) frame);
1052 regs->pc = (unsigned long) ka->sa.sa_handler;
1053 adjustformat(regs);
1054
1055 /*
1056 * This is subtle; if we build more than one sigframe, all but the
1057 * first one will see frame format 0 and have fsize == 0, so we won't
1058 * screw stkadj.
1059 */
1060 if (fsize)
1061 regs->stkadj = fsize;
1062
1063 /* Prepare to skip over the extra stuff in the exception frame. */
1064 if (regs->stkadj) {
1065 struct pt_regs *tregs =
1066 (struct pt_regs *)((ulong)regs + regs->stkadj);
1067#ifdef DEBUG
1068 printk("Performing stackadjust=%04x\n", regs->stkadj);
1069#endif
1070 /* This must be copied with decreasing addresses to
1071 handle overlaps. */
1072 tregs->vector = 0;
1073 tregs->format = 0;
1074 tregs->pc = regs->pc;
1075 tregs->sr = regs->sr;
1076 }
1077 return 0;
1078
1079give_sigsegv:
1080 force_sigsegv(sig, current);
1081 return err;
1082}
1083
1084static inline void
1085handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1086{
1087 switch (regs->d0) {
1088 case -ERESTARTNOHAND:
1089 if (!has_handler)
1090 goto do_restart;
1091 regs->d0 = -EINTR;
1092 break;
1093
1094 case -ERESTART_RESTARTBLOCK:
1095 if (!has_handler) {
1096 regs->d0 = __NR_restart_syscall;
1097 regs->pc -= 2;
1098 break;
1099 }
1100 regs->d0 = -EINTR;
1101 break;
1102
1103 case -ERESTARTSYS:
1104 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1105 regs->d0 = -EINTR;
1106 break;
1107 }
1108 /* fallthrough */
1109 case -ERESTARTNOINTR:
1110 do_restart:
1111 regs->d0 = regs->orig_d0;
1112 regs->pc -= 2;
1113 break;
1114 }
1115}
1116
1117/*
1118 * OK, we're invoking a handler
1119 */
1120static void
1121handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
1122 struct pt_regs *regs)
1123{
1124 sigset_t *oldset = sigmask_to_save();
1125 int err;
1126 /* are we from a system call? */
1127 if (regs->orig_d0 >= 0)
1128 /* If so, check system call restarting.. */
1129 handle_restart(regs, ka, 1);
1130
1131 /* set up the stack frame */
1132 if (ka->sa.sa_flags & SA_SIGINFO)
1133 err = setup_rt_frame(sig, ka, info, oldset, regs);
1134 else
1135 err = setup_frame(sig, ka, oldset, regs);
1136
1137 if (err)
1138 return;
1139
1140 signal_delivered(sig, info, ka, regs, 0);
1141
1142 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1143 regs->sr &= ~0x8000;
1144 send_sig(SIGTRAP, current, 1);
1145 }
1146}
1147
1148/*
1149 * Note that 'init' is a special process: it doesn't get signals it doesn't
1150 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1151 * mistake.
1152 */
1153static void do_signal(struct pt_regs *regs)
1154{
1155 siginfo_t info;
1156 struct k_sigaction ka;
1157 int signr;
1158
1159 current->thread.esp0 = (unsigned long) regs;
1160
1161 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1162 if (signr > 0) {
1163 /* Whee! Actually deliver the signal. */
1164 handle_signal(signr, &ka, &info, regs);
1165 return;
1166 }
1167
1168 /* Did we come from a system call? */
1169 if (regs->orig_d0 >= 0)
1170 /* Restart the system call - no handlers present */
1171 handle_restart(regs, NULL, 0);
1172
1173 /* If there's no signal to deliver, we just restore the saved mask. */
1174 restore_saved_sigmask();
1175}
1176
1177void do_notify_resume(struct pt_regs *regs)
1178{
1179 if (test_thread_flag(TIF_SIGPENDING))
1180 do_signal(regs);
1181
1182 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
1183 tracehook_notify_resume(regs);
1184}