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