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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / arch / m68k / kernel / signal.c
blobf9af893cd2892dde83b6e089d370d093f6db2ac0
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
46 #include <asm/setup.h>
47 #include <asm/uaccess.h>
48 #include <asm/pgtable.h>
49 #include <asm/traps.h>
50 #include <asm/ucontext.h>
51
52 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
53
54 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
55
56 const int frame_extra_sizes[16] = {
57 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
58 [2] = sizeof(((struct frame *)0)->un.fmt2),
59 [3] = sizeof(((struct frame *)0)->un.fmt3),
60 [4] = sizeof(((struct frame *)0)->un.fmt4),
61 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
62 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
63 [7] = sizeof(((struct frame *)0)->un.fmt7),
64 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
65 [9] = sizeof(((struct frame *)0)->un.fmt9),
66 [10] = sizeof(((struct frame *)0)->un.fmta),
67 [11] = sizeof(((struct frame *)0)->un.fmtb),
68 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
69 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
70 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
71 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
72 };
73
74 /*
75 * Atomically swap in the new signal mask, and wait for a signal.
76 */
77 asmlinkage int do_sigsuspend(struct pt_regs *regs)
78 {
79 old_sigset_t mask = regs->d3;
80 sigset_t saveset;
81
82 mask &= _BLOCKABLE;
83 saveset = current->blocked;
84 siginitset(&current->blocked, mask);
85 recalc_sigpending();
86
87 regs->d0 = -EINTR;
88 while (1) {
89 current->state = TASK_INTERRUPTIBLE;
90 schedule();
91 if (do_signal(&saveset, regs))
92 return -EINTR;
93 }
94 }
95
96 asmlinkage int
97 do_rt_sigsuspend(struct pt_regs *regs)
98 {
99 sigset_t __user *unewset = (sigset_t __user *)regs->d1;
100 size_t sigsetsize = (size_t)regs->d2;
101 sigset_t saveset, newset;
102
103 /* XXX: Don't preclude handling different sized sigset_t's. */
104 if (sigsetsize != sizeof(sigset_t))
105 return -EINVAL;
106
107 if (copy_from_user(&newset, unewset, sizeof(newset)))
108 return -EFAULT;
109 sigdelsetmask(&newset, ~_BLOCKABLE);
110
111 saveset = current->blocked;
112 current->blocked = newset;
113 recalc_sigpending();
114
115 regs->d0 = -EINTR;
116 while (1) {
117 current->state = TASK_INTERRUPTIBLE;
118 schedule();
119 if (do_signal(&saveset, regs))
120 return -EINTR;
121 }
122 }
123
124 asmlinkage int
125 sys_sigaction(int sig, const struct old_sigaction __user *act,
126 struct old_sigaction __user *oact)
127 {
128 struct k_sigaction new_ka, old_ka;
129 int ret;
130
131 if (act) {
132 old_sigset_t mask;
133 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
134 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
135 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
136 return -EFAULT;
137 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
138 __get_user(mask, &act->sa_mask);
139 siginitset(&new_ka.sa.sa_mask, mask);
140 }
141
142 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
143
144 if (!ret && oact) {
145 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
146 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
147 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
148 return -EFAULT;
149 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
150 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
151 }
152
153 return ret;
154 }
155
156 asmlinkage int
157 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
158 {
159 return do_sigaltstack(uss, uoss, rdusp());
160 }
161
162
163 /*
164 * Do a signal return; undo the signal stack.
165 *
166 * Keep the return code on the stack quadword aligned!
167 * That makes the cache flush below easier.
168 */
169
170 struct sigframe
171 {
172 char __user *pretcode;
173 int sig;
174 int code;
175 struct sigcontext __user *psc;
176 char retcode[8];
177 unsigned long extramask[_NSIG_WORDS-1];
178 struct sigcontext sc;
179 };
180
181 struct rt_sigframe
182 {
183 char __user *pretcode;
184 int sig;
185 struct siginfo __user *pinfo;
186 void __user *puc;
187 char retcode[8];
188 struct siginfo info;
189 struct ucontext uc;
190 };
191
192
193 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
194
195 static inline int restore_fpu_state(struct sigcontext *sc)
196 {
197 int err = 1;
198
199 if (FPU_IS_EMU) {
200 /* restore registers */
201 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
202 memcpy(current->thread.fp, sc->sc_fpregs, 24);
203 return 0;
204 }
205
206 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
207 /* Verify the frame format. */
208 if (!CPU_IS_060 && (sc->sc_fpstate[0] != fpu_version))
209 goto out;
210 if (CPU_IS_020_OR_030) {
211 if (m68k_fputype & FPU_68881 &&
212 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
213 goto out;
214 if (m68k_fputype & FPU_68882 &&
215 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
216 goto out;
217 } else if (CPU_IS_040) {
218 if (!(sc->sc_fpstate[1] == 0x00 ||
219 sc->sc_fpstate[1] == 0x28 ||
220 sc->sc_fpstate[1] == 0x60))
221 goto out;
222 } else if (CPU_IS_060) {
223 if (!(sc->sc_fpstate[3] == 0x00 ||
224 sc->sc_fpstate[3] == 0x60 ||
225 sc->sc_fpstate[3] == 0xe0))
226 goto out;
227 } else
228 goto out;
229
230 __asm__ volatile (".chip 68k/68881\n\t"
231 "fmovemx %0,%%fp0-%%fp1\n\t"
232 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
233 ".chip 68k"
234 : /* no outputs */
235 : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl));
236 }
237 __asm__ volatile (".chip 68k/68881\n\t"
238 "frestore %0\n\t"
239 ".chip 68k" : : "m" (*sc->sc_fpstate));
240 err = 0;
241
242 out:
243 return err;
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 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
252 {
253 unsigned char fpstate[FPCONTEXT_SIZE];
254 int context_size = CPU_IS_060 ? 8 : 0;
255 fpregset_t fpregs;
256 int err = 1;
257
258 if (FPU_IS_EMU) {
259 /* restore fpu control register */
260 if (__copy_from_user(current->thread.fpcntl,
261 uc->uc_mcontext.fpregs.f_fpcntl, 12))
262 goto out;
263 /* restore all other fpu register */
264 if (__copy_from_user(current->thread.fp,
265 uc->uc_mcontext.fpregs.f_fpregs, 96))
266 goto out;
267 return 0;
268 }
269
270 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
271 goto out;
272 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
273 if (!CPU_IS_060)
274 context_size = fpstate[1];
275 /* Verify the frame format. */
276 if (!CPU_IS_060 && (fpstate[0] != fpu_version))
277 goto out;
278 if (CPU_IS_020_OR_030) {
279 if (m68k_fputype & FPU_68881 &&
280 !(context_size == 0x18 || context_size == 0xb4))
281 goto out;
282 if (m68k_fputype & FPU_68882 &&
283 !(context_size == 0x38 || context_size == 0xd4))
284 goto out;
285 } else if (CPU_IS_040) {
286 if (!(context_size == 0x00 ||
287 context_size == 0x28 ||
288 context_size == 0x60))
289 goto out;
290 } else if (CPU_IS_060) {
291 if (!(fpstate[3] == 0x00 ||
292 fpstate[3] == 0x60 ||
293 fpstate[3] == 0xe0))
294 goto out;
295 } else
296 goto out;
297 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
298 sizeof(fpregs)))
299 goto out;
300 __asm__ volatile (".chip 68k/68881\n\t"
301 "fmovemx %0,%%fp0-%%fp7\n\t"
302 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
303 ".chip 68k"
304 : /* no outputs */
305 : "m" (*fpregs.f_fpregs),
306 "m" (*fpregs.f_fpcntl));
307 }
308 if (context_size &&
309 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
310 context_size))
311 goto out;
312 __asm__ volatile (".chip 68k/68881\n\t"
313 "frestore %0\n\t"
314 ".chip 68k" : : "m" (*fpstate));
315 err = 0;
316
317 out:
318 return err;
319 }
320
321 static inline int
322 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp,
323 int *pd0)
324 {
325 int fsize, formatvec;
326 struct sigcontext context;
327 int err;
328
329 /* get previous context */
330 if (copy_from_user(&context, usc, sizeof(context)))
331 goto badframe;
332
333 /* restore passed registers */
334 regs->d1 = context.sc_d1;
335 regs->a0 = context.sc_a0;
336 regs->a1 = context.sc_a1;
337 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
338 regs->pc = context.sc_pc;
339 regs->orig_d0 = -1; /* disable syscall checks */
340 wrusp(context.sc_usp);
341 formatvec = context.sc_formatvec;
342 regs->format = formatvec >> 12;
343 regs->vector = formatvec & 0xfff;
344
345 err = restore_fpu_state(&context);
346
347 fsize = frame_extra_sizes[regs->format];
348 if (fsize < 0) {
349 /*
350 * user process trying to return with weird frame format
351 */
352 #ifdef DEBUG
353 printk("user process returning with weird frame format\n");
354 #endif
355 goto badframe;
356 }
357
358 /* OK. Make room on the supervisor stack for the extra junk,
359 * if necessary.
360 */
361
362 if (fsize) {
363 struct switch_stack *sw = (struct switch_stack *)regs - 1;
364 regs->d0 = context.sc_d0;
365 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
366 __asm__ __volatile__
367 (" movel %0,%/a0\n\t"
368 " subl %1,%/a0\n\t" /* make room on stack */
369 " movel %/a0,%/sp\n\t" /* set stack pointer */
370 /* move switch_stack and pt_regs */
371 "1: movel %0@+,%/a0@+\n\t"
372 " dbra %2,1b\n\t"
373 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
374 " lsrl #2,%1\n\t"
375 " subql #1,%1\n\t"
376 "2: movesl %4@+,%2\n\t"
377 "3: movel %2,%/a0@+\n\t"
378 " dbra %1,2b\n\t"
379 " bral ret_from_signal\n"
380 "4:\n"
381 ".section __ex_table,\"a\"\n"
382 " .align 4\n"
383 " .long 2b,4b\n"
384 " .long 3b,4b\n"
385 ".previous"
386 : /* no outputs, it doesn't ever return */
387 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
388 "n" (frame_offset), "a" (fp)
389 : "a0");
390 #undef frame_offset
391 /*
392 * If we ever get here an exception occurred while
393 * building the above stack-frame.
394 */
395 goto badframe;
396 }
397
398 *pd0 = context.sc_d0;
399 return err;
400
401 badframe:
402 return 1;
403 }
404
405 static inline int
406 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
407 struct ucontext __user *uc, int *pd0)
408 {
409 int fsize, temp;
410 greg_t __user *gregs = uc->uc_mcontext.gregs;
411 unsigned long usp;
412 int err;
413
414 err = __get_user(temp, &uc->uc_mcontext.version);
415 if (temp != MCONTEXT_VERSION)
416 goto badframe;
417 /* restore passed registers */
418 err |= __get_user(regs->d0, &gregs[0]);
419 err |= __get_user(regs->d1, &gregs[1]);
420 err |= __get_user(regs->d2, &gregs[2]);
421 err |= __get_user(regs->d3, &gregs[3]);
422 err |= __get_user(regs->d4, &gregs[4]);
423 err |= __get_user(regs->d5, &gregs[5]);
424 err |= __get_user(sw->d6, &gregs[6]);
425 err |= __get_user(sw->d7, &gregs[7]);
426 err |= __get_user(regs->a0, &gregs[8]);
427 err |= __get_user(regs->a1, &gregs[9]);
428 err |= __get_user(regs->a2, &gregs[10]);
429 err |= __get_user(sw->a3, &gregs[11]);
430 err |= __get_user(sw->a4, &gregs[12]);
431 err |= __get_user(sw->a5, &gregs[13]);
432 err |= __get_user(sw->a6, &gregs[14]);
433 err |= __get_user(usp, &gregs[15]);
434 wrusp(usp);
435 err |= __get_user(regs->pc, &gregs[16]);
436 err |= __get_user(temp, &gregs[17]);
437 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
438 regs->orig_d0 = -1; /* disable syscall checks */
439 err |= __get_user(temp, &uc->uc_formatvec);
440 regs->format = temp >> 12;
441 regs->vector = temp & 0xfff;
442
443 err |= rt_restore_fpu_state(uc);
444
445 if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
446 goto badframe;
447
448 fsize = frame_extra_sizes[regs->format];
449 if (fsize < 0) {
450 /*
451 * user process trying to return with weird frame format
452 */
453 #ifdef DEBUG
454 printk("user process returning with weird frame format\n");
455 #endif
456 goto badframe;
457 }
458
459 /* OK. Make room on the supervisor stack for the extra junk,
460 * if necessary.
461 */
462
463 if (fsize) {
464 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
465 __asm__ __volatile__
466 (" movel %0,%/a0\n\t"
467 " subl %1,%/a0\n\t" /* make room on stack */
468 " movel %/a0,%/sp\n\t" /* set stack pointer */
469 /* move switch_stack and pt_regs */
470 "1: movel %0@+,%/a0@+\n\t"
471 " dbra %2,1b\n\t"
472 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
473 " lsrl #2,%1\n\t"
474 " subql #1,%1\n\t"
475 "2: movesl %4@+,%2\n\t"
476 "3: movel %2,%/a0@+\n\t"
477 " dbra %1,2b\n\t"
478 " bral ret_from_signal\n"
479 "4:\n"
480 ".section __ex_table,\"a\"\n"
481 " .align 4\n"
482 " .long 2b,4b\n"
483 " .long 3b,4b\n"
484 ".previous"
485 : /* no outputs, it doesn't ever return */
486 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
487 "n" (frame_offset), "a" (&uc->uc_extra)
488 : "a0");
489 #undef frame_offset
490 /*
491 * If we ever get here an exception occurred while
492 * building the above stack-frame.
493 */
494 goto badframe;
495 }
496
497 *pd0 = regs->d0;
498 return err;
499
500 badframe:
501 return 1;
502 }
503
504 asmlinkage int do_sigreturn(unsigned long __unused)
505 {
506 struct switch_stack *sw = (struct switch_stack *) &__unused;
507 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
508 unsigned long usp = rdusp();
509 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
510 sigset_t set;
511 int d0;
512
513 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
514 goto badframe;
515 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
516 (_NSIG_WORDS > 1 &&
517 __copy_from_user(&set.sig[1], &frame->extramask,
518 sizeof(frame->extramask))))
519 goto badframe;
520
521 sigdelsetmask(&set, ~_BLOCKABLE);
522 current->blocked = set;
523 recalc_sigpending();
524
525 if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
526 goto badframe;
527 return d0;
528
529 badframe:
530 force_sig(SIGSEGV, current);
531 return 0;
532 }
533
534 asmlinkage int do_rt_sigreturn(unsigned long __unused)
535 {
536 struct switch_stack *sw = (struct switch_stack *) &__unused;
537 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
538 unsigned long usp = rdusp();
539 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
540 sigset_t set;
541 int d0;
542
543 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
544 goto badframe;
545 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
546 goto badframe;
547
548 sigdelsetmask(&set, ~_BLOCKABLE);
549 current->blocked = set;
550 recalc_sigpending();
551
552 if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
553 goto badframe;
554 return d0;
555
556 badframe:
557 force_sig(SIGSEGV, current);
558 return 0;
559 }
560
561 /*
562 * Set up a signal frame.
563 */
564
565 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
566 {
567 if (FPU_IS_EMU) {
568 /* save registers */
569 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
570 memcpy(sc->sc_fpregs, current->thread.fp, 24);
571 return;
572 }
573
574 __asm__ volatile (".chip 68k/68881\n\t"
575 "fsave %0\n\t"
576 ".chip 68k"
577 : : "m" (*sc->sc_fpstate) : "memory");
578
579 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
580 fpu_version = sc->sc_fpstate[0];
581 if (CPU_IS_020_OR_030 &&
582 regs->vector >= (VEC_FPBRUC * 4) &&
583 regs->vector <= (VEC_FPNAN * 4)) {
584 /* Clear pending exception in 68882 idle frame */
585 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
586 sc->sc_fpstate[0x38] |= 1 << 3;
587 }
588 __asm__ volatile (".chip 68k/68881\n\t"
589 "fmovemx %%fp0-%%fp1,%0\n\t"
590 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
591 ".chip 68k"
592 : "=m" (*sc->sc_fpregs),
593 "=m" (*sc->sc_fpcntl)
594 : /* no inputs */
595 : "memory");
596 }
597 }
598
599 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
600 {
601 unsigned char fpstate[FPCONTEXT_SIZE];
602 int context_size = CPU_IS_060 ? 8 : 0;
603 int err = 0;
604
605 if (FPU_IS_EMU) {
606 /* save fpu control register */
607 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
608 current->thread.fpcntl, 12);
609 /* save all other fpu register */
610 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
611 current->thread.fp, 96);
612 return err;
613 }
614
615 __asm__ volatile (".chip 68k/68881\n\t"
616 "fsave %0\n\t"
617 ".chip 68k"
618 : : "m" (*fpstate) : "memory");
619
620 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
621 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
622 fpregset_t fpregs;
623 if (!CPU_IS_060)
624 context_size = fpstate[1];
625 fpu_version = fpstate[0];
626 if (CPU_IS_020_OR_030 &&
627 regs->vector >= (VEC_FPBRUC * 4) &&
628 regs->vector <= (VEC_FPNAN * 4)) {
629 /* Clear pending exception in 68882 idle frame */
630 if (*(unsigned short *) fpstate == 0x1f38)
631 fpstate[0x38] |= 1 << 3;
632 }
633 __asm__ volatile (".chip 68k/68881\n\t"
634 "fmovemx %%fp0-%%fp7,%0\n\t"
635 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
636 ".chip 68k"
637 : "=m" (*fpregs.f_fpregs),
638 "=m" (*fpregs.f_fpcntl)
639 : /* no inputs */
640 : "memory");
641 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
642 sizeof(fpregs));
643 }
644 if (context_size)
645 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
646 context_size);
647 return err;
648 }
649
650 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
651 unsigned long mask)
652 {
653 sc->sc_mask = mask;
654 sc->sc_usp = rdusp();
655 sc->sc_d0 = regs->d0;
656 sc->sc_d1 = regs->d1;
657 sc->sc_a0 = regs->a0;
658 sc->sc_a1 = regs->a1;
659 sc->sc_sr = regs->sr;
660 sc->sc_pc = regs->pc;
661 sc->sc_formatvec = regs->format << 12 | regs->vector;
662 save_fpu_state(sc, regs);
663 }
664
665 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
666 {
667 struct switch_stack *sw = (struct switch_stack *)regs - 1;
668 greg_t __user *gregs = uc->uc_mcontext.gregs;
669 int err = 0;
670
671 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
672 err |= __put_user(regs->d0, &gregs[0]);
673 err |= __put_user(regs->d1, &gregs[1]);
674 err |= __put_user(regs->d2, &gregs[2]);
675 err |= __put_user(regs->d3, &gregs[3]);
676 err |= __put_user(regs->d4, &gregs[4]);
677 err |= __put_user(regs->d5, &gregs[5]);
678 err |= __put_user(sw->d6, &gregs[6]);
679 err |= __put_user(sw->d7, &gregs[7]);
680 err |= __put_user(regs->a0, &gregs[8]);
681 err |= __put_user(regs->a1, &gregs[9]);
682 err |= __put_user(regs->a2, &gregs[10]);
683 err |= __put_user(sw->a3, &gregs[11]);
684 err |= __put_user(sw->a4, &gregs[12]);
685 err |= __put_user(sw->a5, &gregs[13]);
686 err |= __put_user(sw->a6, &gregs[14]);
687 err |= __put_user(rdusp(), &gregs[15]);
688 err |= __put_user(regs->pc, &gregs[16]);
689 err |= __put_user(regs->sr, &gregs[17]);
690 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
691 err |= rt_save_fpu_state(uc, regs);
692 return err;
693 }
694
695 static inline void push_cache (unsigned long vaddr)
696 {
697 /*
698 * Using the old cache_push_v() was really a big waste.
699 *
700 * What we are trying to do is to flush 8 bytes to ram.
701 * Flushing 2 cache lines of 16 bytes is much cheaper than
702 * flushing 1 or 2 pages, as previously done in
703 * cache_push_v().
704 * Jes
705 */
706 if (CPU_IS_040) {
707 unsigned long temp;
708
709 __asm__ __volatile__ (".chip 68040\n\t"
710 "nop\n\t"
711 "ptestr (%1)\n\t"
712 "movec %%mmusr,%0\n\t"
713 ".chip 68k"
714 : "=r" (temp)
715 : "a" (vaddr));
716
717 temp &= PAGE_MASK;
718 temp |= vaddr & ~PAGE_MASK;
719
720 __asm__ __volatile__ (".chip 68040\n\t"
721 "nop\n\t"
722 "cpushl %%bc,(%0)\n\t"
723 ".chip 68k"
724 : : "a" (temp));
725 }
726 else if (CPU_IS_060) {
727 unsigned long temp;
728 __asm__ __volatile__ (".chip 68060\n\t"
729 "plpar (%0)\n\t"
730 ".chip 68k"
731 : "=a" (temp)
732 : "0" (vaddr));
733 __asm__ __volatile__ (".chip 68060\n\t"
734 "cpushl %%bc,(%0)\n\t"
735 ".chip 68k"
736 : : "a" (temp));
737 }
738 else {
739 /*
740 * 68030/68020 have no writeback cache;
741 * still need to clear icache.
742 * Note that vaddr is guaranteed to be long word aligned.
743 */
744 unsigned long temp;
745 asm volatile ("movec %%cacr,%0" : "=r" (temp));
746 temp += 4;
747 asm volatile ("movec %0,%%caar\n\t"
748 "movec %1,%%cacr"
749 : : "r" (vaddr), "r" (temp));
750 asm volatile ("movec %0,%%caar\n\t"
751 "movec %1,%%cacr"
752 : : "r" (vaddr + 4), "r" (temp));
753 }
754 }
755
756 static inline void __user *
757 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
758 {
759 unsigned long usp;
760
761 /* Default to using normal stack. */
762 usp = rdusp();
763
764 /* This is the X/Open sanctioned signal stack switching. */
765 if (ka->sa.sa_flags & SA_ONSTACK) {
766 if (!sas_ss_flags(usp))
767 usp = current->sas_ss_sp + current->sas_ss_size;
768 }
769 return (void __user *)((usp - frame_size) & -8UL);
770 }
771
772 static void setup_frame (int sig, struct k_sigaction *ka,
773 sigset_t *set, struct pt_regs *regs)
774 {
775 struct sigframe __user *frame;
776 int fsize = frame_extra_sizes[regs->format];
777 struct sigcontext context;
778 int err = 0;
779
780 if (fsize < 0) {
781 #ifdef DEBUG
782 printk ("setup_frame: Unknown frame format %#x\n",
783 regs->format);
784 #endif
785 goto give_sigsegv;
786 }
787
788 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
789
790 if (fsize) {
791 err |= copy_to_user (frame + 1, regs + 1, fsize);
792 regs->stkadj = fsize;
793 }
794
795 err |= __put_user((current_thread_info()->exec_domain
796 && current_thread_info()->exec_domain->signal_invmap
797 && sig < 32
798 ? current_thread_info()->exec_domain->signal_invmap[sig]
799 : sig),
800 &frame->sig);
801
802 err |= __put_user(regs->vector, &frame->code);
803 err |= __put_user(&frame->sc, &frame->psc);
804
805 if (_NSIG_WORDS > 1)
806 err |= copy_to_user(frame->extramask, &set->sig[1],
807 sizeof(frame->extramask));
808
809 setup_sigcontext(&context, regs, set->sig[0]);
810 err |= copy_to_user (&frame->sc, &context, sizeof(context));
811
812 /* Set up to return from userspace. */
813 err |= __put_user(frame->retcode, &frame->pretcode);
814 /* moveq #,d0; trap #0 */
815 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
816 (long __user *)(frame->retcode));
817
818 if (err)
819 goto give_sigsegv;
820
821 push_cache ((unsigned long) &frame->retcode);
822
823 /* Set up registers for signal handler */
824 wrusp ((unsigned long) frame);
825 regs->pc = (unsigned long) ka->sa.sa_handler;
826
827 adjust_stack:
828 /* Prepare to skip over the extra stuff in the exception frame. */
829 if (regs->stkadj) {
830 struct pt_regs *tregs =
831 (struct pt_regs *)((ulong)regs + regs->stkadj);
832 #ifdef DEBUG
833 printk("Performing stackadjust=%04x\n", regs->stkadj);
834 #endif
835 /* This must be copied with decreasing addresses to
836 handle overlaps. */
837 tregs->vector = 0;
838 tregs->format = 0;
839 tregs->pc = regs->pc;
840 tregs->sr = regs->sr;
841 }
842 return;
843
844 give_sigsegv:
845 force_sigsegv(sig, current);
846 goto adjust_stack;
847 }
848
849 static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
850 sigset_t *set, struct pt_regs *regs)
851 {
852 struct rt_sigframe __user *frame;
853 int fsize = frame_extra_sizes[regs->format];
854 int err = 0;
855
856 if (fsize < 0) {
857 #ifdef DEBUG
858 printk ("setup_frame: Unknown frame format %#x\n",
859 regs->format);
860 #endif
861 goto give_sigsegv;
862 }
863
864 frame = get_sigframe(ka, regs, sizeof(*frame));
865
866 if (fsize) {
867 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
868 regs->stkadj = fsize;
869 }
870
871 err |= __put_user((current_thread_info()->exec_domain
872 && current_thread_info()->exec_domain->signal_invmap
873 && sig < 32
874 ? current_thread_info()->exec_domain->signal_invmap[sig]
875 : sig),
876 &frame->sig);
877 err |= __put_user(&frame->info, &frame->pinfo);
878 err |= __put_user(&frame->uc, &frame->puc);
879 err |= copy_siginfo_to_user(&frame->info, info);
880
881 /* Create the ucontext. */
882 err |= __put_user(0, &frame->uc.uc_flags);
883 err |= __put_user(NULL, &frame->uc.uc_link);
884 err |= __put_user((void __user *)current->sas_ss_sp,
885 &frame->uc.uc_stack.ss_sp);
886 err |= __put_user(sas_ss_flags(rdusp()),
887 &frame->uc.uc_stack.ss_flags);
888 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
889 err |= rt_setup_ucontext(&frame->uc, regs);
890 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
891
892 /* Set up to return from userspace. */
893 err |= __put_user(frame->retcode, &frame->pretcode);
894 /* moveq #,d0; notb d0; trap #0 */
895 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
896 (long __user *)(frame->retcode + 0));
897 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
898
899 if (err)
900 goto give_sigsegv;
901
902 push_cache ((unsigned long) &frame->retcode);
903
904 /* Set up registers for signal handler */
905 wrusp ((unsigned long) frame);
906 regs->pc = (unsigned long) ka->sa.sa_handler;
907
908 adjust_stack:
909 /* Prepare to skip over the extra stuff in the exception frame. */
910 if (regs->stkadj) {
911 struct pt_regs *tregs =
912 (struct pt_regs *)((ulong)regs + regs->stkadj);
913 #ifdef DEBUG
914 printk("Performing stackadjust=%04x\n", regs->stkadj);
915 #endif
916 /* This must be copied with decreasing addresses to
917 handle overlaps. */
918 tregs->vector = 0;
919 tregs->format = 0;
920 tregs->pc = regs->pc;
921 tregs->sr = regs->sr;
922 }
923 return;
924
925 give_sigsegv:
926 force_sigsegv(sig, current);
927 goto adjust_stack;
928 }
929
930 static inline void
931 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
932 {
933 switch (regs->d0) {
934 case -ERESTARTNOHAND:
935 if (!has_handler)
936 goto do_restart;
937 regs->d0 = -EINTR;
938 break;
939
940 case -ERESTARTSYS:
941 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
942 regs->d0 = -EINTR;
943 break;
944 }
945 /* fallthrough */
946 case -ERESTARTNOINTR:
947 do_restart:
948 regs->d0 = regs->orig_d0;
949 regs->pc -= 2;
950 break;
951 }
952 }
953
954 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
955 {
956 if (regs->orig_d0 < 0)
957 return;
958 switch (regs->d0) {
959 case -ERESTARTNOHAND:
960 case -ERESTARTSYS:
961 case -ERESTARTNOINTR:
962 regs->d0 = regs->orig_d0;
963 regs->orig_d0 = -1;
964 regs->pc -= 2;
965 break;
966 }
967 }
968
969 /*
970 * OK, we're invoking a handler
971 */
972 static void
973 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
974 sigset_t *oldset, struct pt_regs *regs)
975 {
976 /* are we from a system call? */
977 if (regs->orig_d0 >= 0)
978 /* If so, check system call restarting.. */
979 handle_restart(regs, ka, 1);
980
981 /* set up the stack frame */
982 if (ka->sa.sa_flags & SA_SIGINFO)
983 setup_rt_frame(sig, ka, info, oldset, regs);
984 else
985 setup_frame(sig, ka, oldset, regs);
986
987 if (ka->sa.sa_flags & SA_ONESHOT)
988 ka->sa.sa_handler = SIG_DFL;
989
990 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
991 if (!(ka->sa.sa_flags & SA_NODEFER))
992 sigaddset(&current->blocked,sig);
993 recalc_sigpending();
994 }
995
996 /*
997 * Note that 'init' is a special process: it doesn't get signals it doesn't
998 * want to handle. Thus you cannot kill init even with a SIGKILL even by
999 * mistake.
1000 */
1001 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
1002 {
1003 siginfo_t info;
1004 struct k_sigaction ka;
1005 int signr;
1006
1007 current->thread.esp0 = (unsigned long) regs;
1008
1009 if (!oldset)
1010 oldset = &current->blocked;
1011
1012 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1013 if (signr > 0) {
1014 /* Whee! Actually deliver the signal. */
1015 handle_signal(signr, &ka, &info, oldset, regs);
1016 return 1;
1017 }
1018
1019 /* Did we come from a system call? */
1020 if (regs->orig_d0 >= 0)
1021 /* Restart the system call - no handlers present */
1022 handle_restart(regs, NULL, 0);
1023
1024 return 0;
1025 }
WRT350N Kernel Patches