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Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / arch / m68k / kernel / signal.c
CommitLineData
1da177e4
LT		 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
54asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
55
56const 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 */
77asmlinkage 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
96asmlinkage int
97do_rt_sigsuspend(struct pt_regs *regs)
98{
2382f77f 99 sigset_t __user *unewset = (sigset_t __user *)regs->d1;
1da177e4
LT		 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
124asmlinkage int
2382f77f
AV		 125sys_sigaction(int sig, const struct old_sigaction __user *act,
126 struct old_sigaction __user *oact)
1da177e4
LT		 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
156asmlinkage int
2382f77f 157sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
1da177e4
LT		 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
170struct sigframe
171{
2382f77f 172 char __user *pretcode;
1da177e4
LT		 173 int sig;
174 int code;
2382f77f 175 struct sigcontext __user *psc;
1da177e4
LT		 176 char retcode[8];
177 unsigned long extramask[_NSIG_WORDS-1];
178 struct sigcontext sc;
179};
180
181struct rt_sigframe
182{
2382f77f 183 char __user *pretcode;
1da177e4 184 int sig;
2382f77f
AV		 185 struct siginfo __user *pinfo;
186 void __user *puc;
1da177e4
LT		 187 char retcode[8];
188 struct siginfo info;
189 struct ucontext uc;
190};
191
192
193static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
194
195static 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
242out:
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
2382f77f 251static inline int rt_restore_fpu_state(struct ucontext __user *uc)
1da177e4
LT		 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
2382f77f 270 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
1da177e4
LT		 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 &&
2382f77f 309 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
1da177e4
LT		 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
317out:
318 return err;
319}
320
321static inline int
2382f77f 322restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp,
1da177e4
LT		 323 int *pd0)
324{
325 int fsize, formatvec;
326 struct sigcontext context;
327 int err;
328
c162564e
AS		 329 /* Always make any pending restarted system calls return -EINTR */
330 current_thread_info()->restart_block.fn = do_no_restart_syscall;
331
1da177e4
LT		 332 /* get previous context */
333 if (copy_from_user(&context, usc, sizeof(context)))
334 goto badframe;
335
336 /* restore passed registers */
337 regs->d1 = context.sc_d1;
338 regs->a0 = context.sc_a0;
339 regs->a1 = context.sc_a1;
340 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
341 regs->pc = context.sc_pc;
342 regs->orig_d0 = -1; /* disable syscall checks */
343 wrusp(context.sc_usp);
344 formatvec = context.sc_formatvec;
345 regs->format = formatvec >> 12;
346 regs->vector = formatvec & 0xfff;
347
348 err = restore_fpu_state(&context);
349
350 fsize = frame_extra_sizes[regs->format];
351 if (fsize < 0) {
352 /*
353 * user process trying to return with weird frame format
354 */
355#ifdef DEBUG
356 printk("user process returning with weird frame format\n");
357#endif
358 goto badframe;
359 }
360
361 /* OK. Make room on the supervisor stack for the extra junk,
362 * if necessary.
363 */
364
365 if (fsize) {
366 struct switch_stack *sw = (struct switch_stack *)regs - 1;
367 regs->d0 = context.sc_d0;
368#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
369 __asm__ __volatile__
370 (" movel %0,%/a0\n\t"
371 " subl %1,%/a0\n\t" /* make room on stack */
372 " movel %/a0,%/sp\n\t" /* set stack pointer */
373 /* move switch_stack and pt_regs */
374 "1: movel %0@+,%/a0@+\n\t"
375 " dbra %2,1b\n\t"
376 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
377 " lsrl #2,%1\n\t"
378 " subql #1,%1\n\t"
379 "2: movesl %4@+,%2\n\t"
380 "3: movel %2,%/a0@+\n\t"
381 " dbra %1,2b\n\t"
382 " bral ret_from_signal\n"
383 "4:\n"
384 ".section __ex_table,\"a\"\n"
385 " .align 4\n"
386 " .long 2b,4b\n"
387 " .long 3b,4b\n"
388 ".previous"
389 : /* no outputs, it doesn't ever return */
390 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
391 "n" (frame_offset), "a" (fp)
392 : "a0");
393#undef frame_offset
394 /*
395 * If we ever get here an exception occurred while
396 * building the above stack-frame.
397 */
398 goto badframe;
399 }
400
401 *pd0 = context.sc_d0;
402 return err;
403
404badframe:
405 return 1;
406}
407
408static inline int
409rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
2382f77f 410 struct ucontext __user *uc, int *pd0)
1da177e4
LT		 411{
412 int fsize, temp;
2382f77f 413 greg_t __user *gregs = uc->uc_mcontext.gregs;
1da177e4
LT		 414 unsigned long usp;
415 int err;
416
c162564e
AS		 417 /* Always make any pending restarted system calls return -EINTR */
418 current_thread_info()->restart_block.fn = do_no_restart_syscall;
419
1da177e4
LT		 420 err = __get_user(temp, &uc->uc_mcontext.version);
421 if (temp != MCONTEXT_VERSION)
422 goto badframe;
423 /* restore passed registers */
424 err |= __get_user(regs->d0, &gregs[0]);
425 err |= __get_user(regs->d1, &gregs[1]);
426 err |= __get_user(regs->d2, &gregs[2]);
427 err |= __get_user(regs->d3, &gregs[3]);
428 err |= __get_user(regs->d4, &gregs[4]);
429 err |= __get_user(regs->d5, &gregs[5]);
430 err |= __get_user(sw->d6, &gregs[6]);
431 err |= __get_user(sw->d7, &gregs[7]);
432 err |= __get_user(regs->a0, &gregs[8]);
433 err |= __get_user(regs->a1, &gregs[9]);
434 err |= __get_user(regs->a2, &gregs[10]);
435 err |= __get_user(sw->a3, &gregs[11]);
436 err |= __get_user(sw->a4, &gregs[12]);
437 err |= __get_user(sw->a5, &gregs[13]);
438 err |= __get_user(sw->a6, &gregs[14]);
439 err |= __get_user(usp, &gregs[15]);
440 wrusp(usp);
441 err |= __get_user(regs->pc, &gregs[16]);
442 err |= __get_user(temp, &gregs[17]);
443 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
444 regs->orig_d0 = -1; /* disable syscall checks */
445 err |= __get_user(temp, &uc->uc_formatvec);
446 regs->format = temp >> 12;
447 regs->vector = temp & 0xfff;
448
449 err |= rt_restore_fpu_state(uc);
450
451 if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
452 goto badframe;
453
454 fsize = frame_extra_sizes[regs->format];
455 if (fsize < 0) {
456 /*
457 * user process trying to return with weird frame format
458 */
459#ifdef DEBUG
460 printk("user process returning with weird frame format\n");
461#endif
462 goto badframe;
463 }
464
465 /* OK. Make room on the supervisor stack for the extra junk,
466 * if necessary.
467 */
468
469 if (fsize) {
470#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
471 __asm__ __volatile__
472 (" movel %0,%/a0\n\t"
473 " subl %1,%/a0\n\t" /* make room on stack */
474 " movel %/a0,%/sp\n\t" /* set stack pointer */
475 /* move switch_stack and pt_regs */
476 "1: movel %0@+,%/a0@+\n\t"
477 " dbra %2,1b\n\t"
478 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
479 " lsrl #2,%1\n\t"
480 " subql #1,%1\n\t"
481 "2: movesl %4@+,%2\n\t"
482 "3: movel %2,%/a0@+\n\t"
483 " dbra %1,2b\n\t"
484 " bral ret_from_signal\n"
485 "4:\n"
486 ".section __ex_table,\"a\"\n"
487 " .align 4\n"
488 " .long 2b,4b\n"
489 " .long 3b,4b\n"
490 ".previous"
491 : /* no outputs, it doesn't ever return */
492 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
493 "n" (frame_offset), "a" (&uc->uc_extra)
494 : "a0");
495#undef frame_offset
496 /*
497 * If we ever get here an exception occurred while
498 * building the above stack-frame.
499 */
500 goto badframe;
501 }
502
503 *pd0 = regs->d0;
504 return err;
505
506badframe:
507 return 1;
508}
509
510asmlinkage int do_sigreturn(unsigned long __unused)
511{
512 struct switch_stack *sw = (struct switch_stack *) &__unused;
513 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
514 unsigned long usp = rdusp();
2382f77f 515 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
1da177e4
LT		 516 sigset_t set;
517 int d0;
518
519 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
520 goto badframe;
521 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
522 (_NSIG_WORDS > 1 &&
523 __copy_from_user(&set.sig[1], &frame->extramask,
524 sizeof(frame->extramask))))
525 goto badframe;
526
527 sigdelsetmask(&set, ~_BLOCKABLE);
528 current->blocked = set;
529 recalc_sigpending();
530
531 if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
532 goto badframe;
533 return d0;
534
535badframe:
536 force_sig(SIGSEGV, current);
537 return 0;
538}
539
540asmlinkage int do_rt_sigreturn(unsigned long __unused)
541{
542 struct switch_stack *sw = (struct switch_stack *) &__unused;
543 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
544 unsigned long usp = rdusp();
2382f77f 545 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
1da177e4
LT		 546 sigset_t set;
547 int d0;
548
549 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
550 goto badframe;
551 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
552 goto badframe;
553
554 sigdelsetmask(&set, ~_BLOCKABLE);
555 current->blocked = set;
556 recalc_sigpending();
557
558 if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
559 goto badframe;
560 return d0;
561
562badframe:
563 force_sig(SIGSEGV, current);
564 return 0;
565}
566
567/*
568 * Set up a signal frame.
569 */
570
571static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
572{
573 if (FPU_IS_EMU) {
574 /* save registers */
575 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
576 memcpy(sc->sc_fpregs, current->thread.fp, 24);
577 return;
578 }
579
580 __asm__ volatile (".chip 68k/68881\n\t"
581 "fsave %0\n\t"
582 ".chip 68k"
583 : : "m" (*sc->sc_fpstate) : "memory");
584
585 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
586 fpu_version = sc->sc_fpstate[0];
587 if (CPU_IS_020_OR_030 &&
588 regs->vector >= (VEC_FPBRUC * 4) &&
589 regs->vector <= (VEC_FPNAN * 4)) {
590 /* Clear pending exception in 68882 idle frame */
591 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
592 sc->sc_fpstate[0x38] |= 1 << 3;
593 }
594 __asm__ volatile (".chip 68k/68881\n\t"
595 "fmovemx %%fp0-%%fp1,%0\n\t"
596 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
597 ".chip 68k"
598 : "=m" (*sc->sc_fpregs),
599 "=m" (*sc->sc_fpcntl)
600 : /* no inputs */
601 : "memory");
602 }
603}
604
2382f77f 605static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
1da177e4
LT		 606{
607 unsigned char fpstate[FPCONTEXT_SIZE];
608 int context_size = CPU_IS_060 ? 8 : 0;
609 int err = 0;
610
611 if (FPU_IS_EMU) {
612 /* save fpu control register */
613 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
614 current->thread.fpcntl, 12);
615 /* save all other fpu register */
616 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
617 current->thread.fp, 96);
618 return err;
619 }
620
621 __asm__ volatile (".chip 68k/68881\n\t"
622 "fsave %0\n\t"
623 ".chip 68k"
624 : : "m" (*fpstate) : "memory");
625
2382f77f 626 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
1da177e4
LT		 627 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
628 fpregset_t fpregs;
629 if (!CPU_IS_060)
630 context_size = fpstate[1];
631 fpu_version = fpstate[0];
632 if (CPU_IS_020_OR_030 &&
633 regs->vector >= (VEC_FPBRUC * 4) &&
634 regs->vector <= (VEC_FPNAN * 4)) {
635 /* Clear pending exception in 68882 idle frame */
636 if (*(unsigned short *) fpstate == 0x1f38)
637 fpstate[0x38] |= 1 << 3;
638 }
639 __asm__ volatile (".chip 68k/68881\n\t"
640 "fmovemx %%fp0-%%fp7,%0\n\t"
641 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
642 ".chip 68k"
643 : "=m" (*fpregs.f_fpregs),
644 "=m" (*fpregs.f_fpcntl)
645 : /* no inputs */
646 : "memory");
647 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
648 sizeof(fpregs));
649 }
650 if (context_size)
2382f77f 651 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
1da177e4
LT		 652 context_size);
653 return err;
654}
655
656static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
657 unsigned long mask)
658{
659 sc->sc_mask = mask;
660 sc->sc_usp = rdusp();
661 sc->sc_d0 = regs->d0;
662 sc->sc_d1 = regs->d1;
663 sc->sc_a0 = regs->a0;
664 sc->sc_a1 = regs->a1;
665 sc->sc_sr = regs->sr;
666 sc->sc_pc = regs->pc;
667 sc->sc_formatvec = regs->format << 12 | regs->vector;
668 save_fpu_state(sc, regs);
669}
670
2382f77f 671static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
1da177e4
LT		 672{
673 struct switch_stack *sw = (struct switch_stack *)regs - 1;
2382f77f 674 greg_t __user *gregs = uc->uc_mcontext.gregs;
1da177e4
LT		 675 int err = 0;
676
677 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
678 err |= __put_user(regs->d0, &gregs[0]);
679 err |= __put_user(regs->d1, &gregs[1]);
680 err |= __put_user(regs->d2, &gregs[2]);
681 err |= __put_user(regs->d3, &gregs[3]);
682 err |= __put_user(regs->d4, &gregs[4]);
683 err |= __put_user(regs->d5, &gregs[5]);
684 err |= __put_user(sw->d6, &gregs[6]);
685 err |= __put_user(sw->d7, &gregs[7]);
686 err |= __put_user(regs->a0, &gregs[8]);
687 err |= __put_user(regs->a1, &gregs[9]);
688 err |= __put_user(regs->a2, &gregs[10]);
689 err |= __put_user(sw->a3, &gregs[11]);
690 err |= __put_user(sw->a4, &gregs[12]);
691 err |= __put_user(sw->a5, &gregs[13]);
692 err |= __put_user(sw->a6, &gregs[14]);
693 err |= __put_user(rdusp(), &gregs[15]);
694 err |= __put_user(regs->pc, &gregs[16]);
695 err |= __put_user(regs->sr, &gregs[17]);
696 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
697 err |= rt_save_fpu_state(uc, regs);
698 return err;
699}
700
701static inline void push_cache (unsigned long vaddr)
702{
703 /*
704 * Using the old cache_push_v() was really a big waste.
705 *
706 * What we are trying to do is to flush 8 bytes to ram.
707 * Flushing 2 cache lines of 16 bytes is much cheaper than
708 * flushing 1 or 2 pages, as previously done in
709 * cache_push_v().
710 * Jes
711 */
712 if (CPU_IS_040) {
713 unsigned long temp;
714
715 __asm__ __volatile__ (".chip 68040\n\t"
716 "nop\n\t"
717 "ptestr (%1)\n\t"
718 "movec %%mmusr,%0\n\t"
719 ".chip 68k"
720 : "=r" (temp)
721 : "a" (vaddr));
722
723 temp &= PAGE_MASK;
724 temp |= vaddr & ~PAGE_MASK;
725
726 __asm__ __volatile__ (".chip 68040\n\t"
727 "nop\n\t"
728 "cpushl %%bc,(%0)\n\t"
729 ".chip 68k"
730 : : "a" (temp));
731 }
732 else if (CPU_IS_060) {
733 unsigned long temp;
734 __asm__ __volatile__ (".chip 68060\n\t"
735 "plpar (%0)\n\t"
736 ".chip 68k"
737 : "=a" (temp)
738 : "0" (vaddr));
739 __asm__ __volatile__ (".chip 68060\n\t"
740 "cpushl %%bc,(%0)\n\t"
741 ".chip 68k"
742 : : "a" (temp));
743 }
744 else {
745 /*
746 * 68030/68020 have no writeback cache;
747 * still need to clear icache.
748 * Note that vaddr is guaranteed to be long word aligned.
749 */
750 unsigned long temp;
751 asm volatile ("movec %%cacr,%0" : "=r" (temp));
752 temp += 4;
753 asm volatile ("movec %0,%%caar\n\t"
754 "movec %1,%%cacr"
755 : : "r" (vaddr), "r" (temp));
756 asm volatile ("movec %0,%%caar\n\t"
757 "movec %1,%%cacr"
758 : : "r" (vaddr + 4), "r" (temp));
759 }
760}
761
2382f77f 762static inline void __user *
1da177e4
LT		 763get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
764{
765 unsigned long usp;
766
767 /* Default to using normal stack. */
768 usp = rdusp();
769
770 /* This is the X/Open sanctioned signal stack switching. */
771 if (ka->sa.sa_flags & SA_ONSTACK) {
d09042da 772 if (!sas_ss_flags(usp))
1da177e4
LT		 773 usp = current->sas_ss_sp + current->sas_ss_size;
774 }
2382f77f 775 return (void __user *)((usp - frame_size) & -8UL);
1da177e4
LT		 776}
777
778static void setup_frame (int sig, struct k_sigaction *ka,
779 sigset_t *set, struct pt_regs *regs)
780{
2382f77f 781 struct sigframe __user *frame;
1da177e4
LT		 782 int fsize = frame_extra_sizes[regs->format];
783 struct sigcontext context;
784 int err = 0;
785
786 if (fsize < 0) {
787#ifdef DEBUG
788 printk ("setup_frame: Unknown frame format %#x\n",
789 regs->format);
790#endif
791 goto give_sigsegv;
792 }
793
794 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
795
796 if (fsize) {
797 err |= copy_to_user (frame + 1, regs + 1, fsize);
798 regs->stkadj = fsize;
799 }
800
801 err |= __put_user((current_thread_info()->exec_domain
802 && current_thread_info()->exec_domain->signal_invmap
803 && sig < 32
804 ? current_thread_info()->exec_domain->signal_invmap[sig]
805 : sig),
806 &frame->sig);
807
808 err |= __put_user(regs->vector, &frame->code);
809 err |= __put_user(&frame->sc, &frame->psc);
810
811 if (_NSIG_WORDS > 1)
812 err |= copy_to_user(frame->extramask, &set->sig[1],
813 sizeof(frame->extramask));
814
815 setup_sigcontext(&context, regs, set->sig[0]);
816 err |= copy_to_user (&frame->sc, &context, sizeof(context));
817
818 /* Set up to return from userspace. */
819 err |= __put_user(frame->retcode, &frame->pretcode);
820 /* moveq #,d0; trap #0 */
821 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
2382f77f 822 (long __user *)(frame->retcode));
1da177e4
LT		 823
824 if (err)
825 goto give_sigsegv;
826
827 push_cache ((unsigned long) &frame->retcode);
828
829 /* Set up registers for signal handler */
830 wrusp ((unsigned long) frame);
831 regs->pc = (unsigned long) ka->sa.sa_handler;
832
833adjust_stack:
834 /* Prepare to skip over the extra stuff in the exception frame. */
835 if (regs->stkadj) {
836 struct pt_regs *tregs =
837 (struct pt_regs *)((ulong)regs + regs->stkadj);
838#ifdef DEBUG
839 printk("Performing stackadjust=%04x\n", regs->stkadj);
840#endif
841 /* This must be copied with decreasing addresses to
842 handle overlaps. */
843 tregs->vector = 0;
844 tregs->format = 0;
845 tregs->pc = regs->pc;
846 tregs->sr = regs->sr;
847 }
848 return;
849
850give_sigsegv:
851 force_sigsegv(sig, current);
852 goto adjust_stack;
853}
854
855static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
856 sigset_t *set, struct pt_regs *regs)
857{
2382f77f 858 struct rt_sigframe __user *frame;
1da177e4
LT		 859 int fsize = frame_extra_sizes[regs->format];
860 int err = 0;
861
862 if (fsize < 0) {
863#ifdef DEBUG
864 printk ("setup_frame: Unknown frame format %#x\n",
865 regs->format);
866#endif
867 goto give_sigsegv;
868 }
869
870 frame = get_sigframe(ka, regs, sizeof(*frame));
871
872 if (fsize) {
873 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
874 regs->stkadj = fsize;
875 }
876
877 err |= __put_user((current_thread_info()->exec_domain
878 && current_thread_info()->exec_domain->signal_invmap
879 && sig < 32
880 ? current_thread_info()->exec_domain->signal_invmap[sig]
881 : sig),
882 &frame->sig);
883 err |= __put_user(&frame->info, &frame->pinfo);
884 err |= __put_user(&frame->uc, &frame->puc);
885 err |= copy_siginfo_to_user(&frame->info, info);
886
887 /* Create the ucontext. */
888 err |= __put_user(0, &frame->uc.uc_flags);
2382f77f
AV		 889 err |= __put_user(NULL, &frame->uc.uc_link);
890 err |= __put_user((void __user *)current->sas_ss_sp,
1da177e4
LT		 891 &frame->uc.uc_stack.ss_sp);
892 err |= __put_user(sas_ss_flags(rdusp()),
893 &frame->uc.uc_stack.ss_flags);
894 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
895 err |= rt_setup_ucontext(&frame->uc, regs);
896 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
897
898 /* Set up to return from userspace. */
899 err |= __put_user(frame->retcode, &frame->pretcode);
900 /* moveq #,d0; notb d0; trap #0 */
901 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
2382f77f
AV		 902 (long __user *)(frame->retcode + 0));
903 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1da177e4
LT		 904
905 if (err)
906 goto give_sigsegv;
907
908 push_cache ((unsigned long) &frame->retcode);
909
910 /* Set up registers for signal handler */
911 wrusp ((unsigned long) frame);
912 regs->pc = (unsigned long) ka->sa.sa_handler;
913
914adjust_stack:
915 /* Prepare to skip over the extra stuff in the exception frame. */
916 if (regs->stkadj) {
917 struct pt_regs *tregs =
918 (struct pt_regs *)((ulong)regs + regs->stkadj);
919#ifdef DEBUG
920 printk("Performing stackadjust=%04x\n", regs->stkadj);
921#endif
922 /* This must be copied with decreasing addresses to
923 handle overlaps. */
924 tregs->vector = 0;
925 tregs->format = 0;
926 tregs->pc = regs->pc;
927 tregs->sr = regs->sr;
928 }
929 return;
930
931give_sigsegv:
932 force_sigsegv(sig, current);
933 goto adjust_stack;
934}
935
936static inline void
937handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
938{
939 switch (regs->d0) {
940 case -ERESTARTNOHAND:
941 if (!has_handler)
942 goto do_restart;
943 regs->d0 = -EINTR;
944 break;
945
c162564e
AS		 946 case -ERESTART_RESTARTBLOCK:
947 if (!has_handler) {
948 regs->d0 = __NR_restart_syscall;
949 regs->pc -= 2;
950 break;
951 }
952 regs->d0 = -EINTR;
953 break;
954
1da177e4
LT		 955 case -ERESTARTSYS:
956 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
957 regs->d0 = -EINTR;
958 break;
959 }
960 /* fallthrough */
961 case -ERESTARTNOINTR:
962 do_restart:
963 regs->d0 = regs->orig_d0;
964 regs->pc -= 2;
965 break;
966 }
967}
968
969void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
970{
971 if (regs->orig_d0 < 0)
972 return;
973 switch (regs->d0) {
974 case -ERESTARTNOHAND:
975 case -ERESTARTSYS:
976 case -ERESTARTNOINTR:
977 regs->d0 = regs->orig_d0;
978 regs->orig_d0 = -1;
979 regs->pc -= 2;
980 break;
981 }
982}
983
984/*
985 * OK, we're invoking a handler
986 */
987static void
988handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
989 sigset_t *oldset, struct pt_regs *regs)
990{
991 /* are we from a system call? */
992 if (regs->orig_d0 >= 0)
993 /* If so, check system call restarting.. */
994 handle_restart(regs, ka, 1);
995
996 /* set up the stack frame */
997 if (ka->sa.sa_flags & SA_SIGINFO)
998 setup_rt_frame(sig, ka, info, oldset, regs);
999 else
1000 setup_frame(sig, ka, oldset, regs);
1001
1002 if (ka->sa.sa_flags & SA_ONESHOT)
1003 ka->sa.sa_handler = SIG_DFL;
1004
1005 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
1006 if (!(ka->sa.sa_flags & SA_NODEFER))
1007 sigaddset(&current->blocked,sig);
1008 recalc_sigpending();
1009}
1010
1011/*
1012 * Note that 'init' is a special process: it doesn't get signals it doesn't
1013 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1014 * mistake.
1015 */
1016asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
1017{
1018 siginfo_t info;
1019 struct k_sigaction ka;
1020 int signr;
1021
1022 current->thread.esp0 = (unsigned long) regs;
1023
1024 if (!oldset)
1025 oldset = &current->blocked;
1026
1027 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1028 if (signr > 0) {
1029 /* Whee! Actually deliver the signal. */
1030 handle_signal(signr, &ka, &info, oldset, regs);
1031 return 1;
1032 }
1033
1034 /* Did we come from a system call? */
1035 if (regs->orig_d0 >= 0)
1036 /* Restart the system call - no handlers present */
1037 handle_restart(regs, NULL, 0);
1038
1039 return 0;
1040}
Linux 6.x block layer and io_uring tree(s)