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
67 static 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
frame_extra_sizes(int f)85 static inline int frame_extra_sizes(int f)
86 {
87 return frame_size_change[f];
88 }
89
fixup_exception(struct pt_regs * regs)90 int 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
push_cache(unsigned long vaddr)111 static 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
adjustformat(struct pt_regs * regs)178 static inline void adjustformat(struct pt_regs *regs)
179 {
180 }
181
save_a5_state(struct sigcontext * sc,struct pt_regs * regs)182 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
183 {
184 }
185
186 #else /* CONFIG_MMU */
187
188 void ret_from_user_signal(void);
189 void ret_from_user_rt_signal(void);
190
frame_extra_sizes(int f)191 static inline int frame_extra_sizes(int f)
192 {
193 /* No frame size adjustments required on non-MMU CPUs */
194 return 0;
195 }
196
adjustformat(struct pt_regs * regs)197 static 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
save_a5_state(struct sigcontext * sc,struct pt_regs * regs)206 static 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
push_cache(unsigned long vaddr)211 static 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
224 struct 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
235 struct 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
253 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
254
restore_fpu_state(struct sigcontext * sc)255 static 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
327 out:
328 return err;
329 }
330
rt_restore_fpu_state(struct ucontext __user * uc)331 static 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
422 out:
423 return err;
424 }
425
426 /*
427 * Set up a signal frame.
428 */
save_fpu_state(struct sigcontext * sc,struct pt_regs * regs)429 static 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
rt_save_fpu_state(struct ucontext __user * uc,struct pt_regs * regs)482 static 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 */
restore_fpu_state(struct sigcontext * sc)555 static inline int restore_fpu_state(struct sigcontext *sc)
556 {
557 return 0;
558 }
559
rt_restore_fpu_state(struct ucontext __user * uc)560 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
561 {
562 return 0;
563 }
564
save_fpu_state(struct sigcontext * sc,struct pt_regs * regs)565 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
566 {
567 }
568
rt_save_fpu_state(struct ucontext __user * uc,struct pt_regs * regs)569 static 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
siginfo_build_tests(void)576 static 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
mangle_kernel_stack(struct pt_regs * regs,int formatvec,void __user * fp)642 static 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
676 static inline int
restore_sigcontext(struct pt_regs * regs,struct sigcontext __user * usc,void __user * fp)677 restore_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
708 static inline int
rt_restore_ucontext(struct pt_regs * regs,struct switch_stack * sw,struct ucontext __user * uc)709 rt_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
do_sigreturn(struct pt_regs * regs,struct switch_stack * sw)756 asmlinkage 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
778 badframe:
779 force_sig(SIGSEGV);
780 return sw;
781 }
782
do_rt_sigreturn(struct pt_regs * regs,struct switch_stack * sw)783 asmlinkage 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
802 badframe:
803 force_sig(SIGSEGV);
804 return sw;
805 }
806
rte_regs(struct pt_regs * regs)807 static inline struct pt_regs *rte_regs(struct pt_regs *regs)
808 {
809 return (void *)regs + regs->stkadj;
810 }
811
setup_sigcontext(struct sigcontext * sc,struct pt_regs * regs,unsigned long mask)812 static 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
rt_setup_ucontext(struct ucontext __user * uc,struct pt_regs * regs)829 static 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
860 static inline void __user *
get_sigframe(struct ksignal * ksig,struct pt_regs * tregs,size_t frame_size)861 get_sigframe(struct ksignal *ksig, struct pt_regs *tregs, size_t frame_size)
862 {
863 unsigned long usp = sigsp(rdusp(), ksig);
864 unsigned long gap = 0;
865
866 if (CPU_IS_020_OR_030 && tregs->format == 0xb) {
867 /* USP is unreliable so use worst-case value */
868 gap = 256;
869 }
870
871 return (void __user *)((usp - gap - frame_size) & -8UL);
872 }
873
setup_frame(struct ksignal * ksig,sigset_t * set,struct pt_regs * regs)874 static int setup_frame(struct ksignal *ksig, sigset_t *set,
875 struct pt_regs *regs)
876 {
877 struct sigframe __user *frame;
878 struct pt_regs *tregs = rte_regs(regs);
879 int fsize = frame_extra_sizes(tregs->format);
880 struct sigcontext context;
881 int err = 0, sig = ksig->sig;
882
883 if (fsize < 0) {
884 pr_debug("setup_frame: Unknown frame format %#x\n",
885 tregs->format);
886 return -EFAULT;
887 }
888
889 frame = get_sigframe(ksig, tregs, sizeof(*frame) + fsize);
890
891 if (fsize)
892 err |= copy_to_user (frame + 1, regs + 1, fsize);
893
894 err |= __put_user(sig, &frame->sig);
895
896 err |= __put_user(tregs->vector, &frame->code);
897 err |= __put_user(&frame->sc, &frame->psc);
898
899 if (_NSIG_WORDS > 1)
900 err |= copy_to_user(frame->extramask, &set->sig[1],
901 sizeof(frame->extramask));
902
903 setup_sigcontext(&context, regs, set->sig[0]);
904 err |= copy_to_user (&frame->sc, &context, sizeof(context));
905
906 /* Set up to return from userspace. */
907 #ifdef CONFIG_MMU
908 err |= __put_user(frame->retcode, &frame->pretcode);
909 /* moveq #,d0; trap #0 */
910 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
911 (long __user *)(frame->retcode));
912 #else
913 err |= __put_user((long) ret_from_user_signal,
914 (long __user *) &frame->pretcode);
915 #endif
916
917 if (err)
918 return -EFAULT;
919
920 push_cache ((unsigned long) &frame->retcode);
921
922 /*
923 * This is subtle; if we build more than one sigframe, all but the
924 * first one will see frame format 0 and have fsize == 0, so we won't
925 * screw stkadj.
926 */
927 if (fsize) {
928 regs->stkadj = fsize;
929 tregs = rte_regs(regs);
930 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
931 tregs->vector = 0;
932 tregs->format = 0;
933 tregs->sr = regs->sr;
934 }
935
936 /*
937 * Set up registers for signal handler. All the state we are about
938 * to destroy is successfully copied to sigframe.
939 */
940 wrusp ((unsigned long) frame);
941 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
942 adjustformat(regs);
943
944 return 0;
945 }
946
setup_rt_frame(struct ksignal * ksig,sigset_t * set,struct pt_regs * regs)947 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
948 struct pt_regs *regs)
949 {
950 struct rt_sigframe __user *frame;
951 struct pt_regs *tregs = rte_regs(regs);
952 int fsize = frame_extra_sizes(tregs->format);
953 int err = 0, sig = ksig->sig;
954
955 if (fsize < 0) {
956 pr_debug("setup_frame: Unknown frame format %#x\n",
957 regs->format);
958 return -EFAULT;
959 }
960
961 frame = get_sigframe(ksig, tregs, sizeof(*frame));
962
963 if (fsize)
964 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
965
966 err |= __put_user(sig, &frame->sig);
967 err |= __put_user(&frame->info, &frame->pinfo);
968 err |= __put_user(&frame->uc, &frame->puc);
969 err |= copy_siginfo_to_user(&frame->info, &ksig->info);
970
971 /* Create the ucontext. */
972 err |= __put_user(0, &frame->uc.uc_flags);
973 err |= __put_user(NULL, &frame->uc.uc_link);
974 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
975 err |= rt_setup_ucontext(&frame->uc, regs);
976 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
977
978 /* Set up to return from userspace. */
979 #ifdef CONFIG_MMU
980 err |= __put_user(frame->retcode, &frame->pretcode);
981 #ifdef __mcoldfire__
982 /* movel #__NR_rt_sigreturn,d0; trap #0 */
983 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
984 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
985 (long __user *)(frame->retcode + 4));
986 #else
987 /* moveq #,d0; notb d0; trap #0 */
988 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
989 (long __user *)(frame->retcode + 0));
990 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
991 #endif
992 #else
993 err |= __put_user((long) ret_from_user_rt_signal,
994 (long __user *) &frame->pretcode);
995 #endif /* CONFIG_MMU */
996
997 if (err)
998 return -EFAULT;
999
1000 push_cache ((unsigned long) &frame->retcode);
1001
1002 /*
1003 * This is subtle; if we build more than one sigframe, all but the
1004 * first one will see frame format 0 and have fsize == 0, so we won't
1005 * screw stkadj.
1006 */
1007 if (fsize) {
1008 regs->stkadj = fsize;
1009 tregs = rte_regs(regs);
1010 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
1011 tregs->vector = 0;
1012 tregs->format = 0;
1013 tregs->sr = regs->sr;
1014 }
1015
1016 /*
1017 * Set up registers for signal handler. All the state we are about
1018 * to destroy is successfully copied to sigframe.
1019 */
1020 wrusp ((unsigned long) frame);
1021 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
1022 adjustformat(regs);
1023 return 0;
1024 }
1025
1026 static inline void
handle_restart(struct pt_regs * regs,struct k_sigaction * ka,int has_handler)1027 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1028 {
1029 switch (regs->d0) {
1030 case -ERESTARTNOHAND:
1031 if (!has_handler)
1032 goto do_restart;
1033 regs->d0 = -EINTR;
1034 break;
1035
1036 case -ERESTART_RESTARTBLOCK:
1037 if (!has_handler) {
1038 regs->d0 = __NR_restart_syscall;
1039 regs->pc -= 2;
1040 break;
1041 }
1042 regs->d0 = -EINTR;
1043 break;
1044
1045 case -ERESTARTSYS:
1046 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1047 regs->d0 = -EINTR;
1048 break;
1049 }
1050 fallthrough;
1051 case -ERESTARTNOINTR:
1052 do_restart:
1053 regs->d0 = regs->orig_d0;
1054 regs->pc -= 2;
1055 break;
1056 }
1057 }
1058
1059 /*
1060 * OK, we're invoking a handler
1061 */
1062 static void
handle_signal(struct ksignal * ksig,struct pt_regs * regs)1063 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
1064 {
1065 sigset_t *oldset = sigmask_to_save();
1066 int err;
1067 /* are we from a system call? */
1068 if (regs->orig_d0 >= 0)
1069 /* If so, check system call restarting.. */
1070 handle_restart(regs, &ksig->ka, 1);
1071
1072 /* set up the stack frame */
1073 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
1074 err = setup_rt_frame(ksig, oldset, regs);
1075 else
1076 err = setup_frame(ksig, oldset, regs);
1077
1078 signal_setup_done(err, ksig, 0);
1079
1080 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1081 regs->sr &= ~0x8000;
1082 send_sig(SIGTRAP, current, 1);
1083 }
1084 }
1085
1086 /*
1087 * Note that 'init' is a special process: it doesn't get signals it doesn't
1088 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1089 * mistake.
1090 */
do_signal(struct pt_regs * regs)1091 static void do_signal(struct pt_regs *regs)
1092 {
1093 struct ksignal ksig;
1094
1095 current->thread.esp0 = (unsigned long) regs;
1096
1097 if (get_signal(&ksig)) {
1098 /* Whee! Actually deliver the signal. */
1099 handle_signal(&ksig, regs);
1100 return;
1101 }
1102
1103 /* Did we come from a system call? */
1104 if (regs->orig_d0 >= 0)
1105 /* Restart the system call - no handlers present */
1106 handle_restart(regs, NULL, 0);
1107
1108 /* If there's no signal to deliver, we just restore the saved mask. */
1109 restore_saved_sigmask();
1110 }
1111
do_notify_resume(struct pt_regs * regs)1112 void do_notify_resume(struct pt_regs *regs)
1113 {
1114 if (test_thread_flag(TIF_NOTIFY_SIGNAL) ||
1115 test_thread_flag(TIF_SIGPENDING))
1116 do_signal(regs);
1117
1118 if (test_thread_flag(TIF_NOTIFY_RESUME))
1119 resume_user_mode_work(regs);
1120 }
1121