2 * linux/arch/m68k/kernel/signal.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
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
12 * Linux/m68k support by Hamish Macdonald
14 * 68060 fixes by Jesper Skov
16 * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
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)
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
31 #include <linux/sched.h>
33 #include <linux/kernel.h>
34 #include <linux/signal.h>
35 #include <linux/syscalls.h>
36 #include <linux/errno.h>
37 #include <linux/wait.h>
38 #include <linux/ptrace.h>
39 #include <linux/unistd.h>
40 #include <linux/stddef.h>
41 #include <linux/highuid.h>
42 #include <linux/personality.h>
43 #include <linux/tty.h>
44 #include <linux/binfmts.h>
45 #include <linux/module.h>
46 #include <linux/tracehook.h>
48 #include <asm/setup.h>
49 #include <asm/uaccess.h>
50 #include <asm/pgtable.h>
51 #include <asm/traps.h>
52 #include <asm/ucontext.h>
54 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
59 * Handle the slight differences in classic 68k and ColdFire trap frames.
61 #ifdef CONFIG_COLDFIRE
66 #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
69 static const int frame_size_change[16] = {
70 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
71 [2] = sizeof(((struct frame *)0)->un.fmt2),
72 [3] = sizeof(((struct frame *)0)->un.fmt3),
74 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
75 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
76 [7] = sizeof(((struct frame *)0)->un.fmt7),
77 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
78 [9] = sizeof(((struct frame *)0)->un.fmt9),
79 [10] = sizeof(((struct frame *)0)->un.fmta),
80 [11] = sizeof(((struct frame *)0)->un.fmtb),
81 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
82 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
83 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
84 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
87 static inline int frame_extra_sizes(int f)
89 return frame_size_change[f];
92 int handle_kernel_fault(struct pt_regs *regs)
94 const struct exception_table_entry *fixup;
95 struct pt_regs *tregs;
97 /* Are we prepared to handle this kernel fault? */
98 fixup = search_exception_tables(regs->pc);
102 /* Create a new four word stack frame, discarding the old one. */
103 regs->stkadj = frame_extra_sizes(regs->format);
104 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
105 tregs->vector = regs->vector;
106 tregs->format = FORMAT;
107 tregs->pc = fixup->fixup;
108 tregs->sr = regs->sr;
113 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
115 if (regs->orig_d0 < 0)
118 case -ERESTARTNOHAND:
120 case -ERESTARTNOINTR:
121 regs->d0 = regs->orig_d0;
128 static inline void push_cache (unsigned long vaddr)
131 * Using the old cache_push_v() was really a big waste.
133 * What we are trying to do is to flush 8 bytes to ram.
134 * Flushing 2 cache lines of 16 bytes is much cheaper than
135 * flushing 1 or 2 pages, as previously done in
142 __asm__ __volatile__ (".chip 68040\n\t"
145 "movec %%mmusr,%0\n\t"
151 temp |= vaddr & ~PAGE_MASK;
153 __asm__ __volatile__ (".chip 68040\n\t"
155 "cpushl %%bc,(%0)\n\t"
159 else if (CPU_IS_060) {
161 __asm__ __volatile__ (".chip 68060\n\t"
166 __asm__ __volatile__ (".chip 68060\n\t"
167 "cpushl %%bc,(%0)\n\t"
170 } else if (!CPU_IS_COLDFIRE) {
172 * 68030/68020 have no writeback cache;
173 * still need to clear icache.
174 * Note that vaddr is guaranteed to be long word aligned.
177 asm volatile ("movec %%cacr,%0" : "=r" (temp));
179 asm volatile ("movec %0,%%caar\n\t"
181 : : "r" (vaddr), "r" (temp));
182 asm volatile ("movec %0,%%caar\n\t"
184 : : "r" (vaddr + 4), "r" (temp));
188 static inline void adjustformat(struct pt_regs *regs)
192 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
196 #else /* CONFIG_MMU */
198 void ret_from_user_signal(void);
199 void ret_from_user_rt_signal(void);
201 static inline int frame_extra_sizes(int f)
203 /* No frame size adjustments required on non-MMU CPUs */
207 static inline void adjustformat(struct pt_regs *regs)
209 ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
211 * set format byte to make stack appear modulo 4, which it will
212 * be when doing the rte
217 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
219 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
222 static inline void push_cache(unsigned long vaddr)
226 #endif /* CONFIG_MMU */
229 * Atomically swap in the new signal mask, and wait for a signal.
232 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
235 siginitset(&blocked, mask);
236 return sigsuspend(&blocked);
240 sys_sigaction(int sig, const struct old_sigaction __user *act,
241 struct old_sigaction __user *oact)
243 struct k_sigaction new_ka, old_ka;
248 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
249 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
250 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
251 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
252 __get_user(mask, &act->sa_mask))
254 siginitset(&new_ka.sa.sa_mask, mask);
257 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
260 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
261 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
262 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
263 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
264 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
272 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
274 return do_sigaltstack(uss, uoss, rdusp());
279 * Do a signal return; undo the signal stack.
281 * Keep the return code on the stack quadword aligned!
282 * That makes the cache flush below easier.
287 char __user *pretcode;
290 struct sigcontext __user *psc;
292 unsigned long extramask[_NSIG_WORDS-1];
293 struct sigcontext sc;
298 char __user *pretcode;
300 struct siginfo __user *pinfo;
307 #define FPCONTEXT_SIZE 216
308 #define uc_fpstate uc_filler[0]
309 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
310 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
314 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
316 static inline int restore_fpu_state(struct sigcontext *sc)
321 /* restore registers */
322 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
323 memcpy(current->thread.fp, sc->sc_fpregs, 24);
327 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
328 /* Verify the frame format. */
329 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
330 (sc->sc_fpstate[0] != fpu_version))
332 if (CPU_IS_020_OR_030) {
333 if (m68k_fputype & FPU_68881 &&
334 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
336 if (m68k_fputype & FPU_68882 &&
337 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
339 } else if (CPU_IS_040) {
340 if (!(sc->sc_fpstate[1] == 0x00 ||
341 sc->sc_fpstate[1] == 0x28 ||
342 sc->sc_fpstate[1] == 0x60))
344 } else if (CPU_IS_060) {
345 if (!(sc->sc_fpstate[3] == 0x00 ||
346 sc->sc_fpstate[3] == 0x60 ||
347 sc->sc_fpstate[3] == 0xe0))
349 } else if (CPU_IS_COLDFIRE) {
350 if (!(sc->sc_fpstate[0] == 0x00 ||
351 sc->sc_fpstate[0] == 0x05 ||
352 sc->sc_fpstate[0] == 0xe5))
357 if (CPU_IS_COLDFIRE) {
358 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
359 "fmovel %1,%%fpcr\n\t"
360 "fmovel %2,%%fpsr\n\t"
363 : "m" (sc->sc_fpregs[0]),
364 "m" (sc->sc_fpcntl[0]),
365 "m" (sc->sc_fpcntl[1]),
366 "m" (sc->sc_fpcntl[2]));
368 __asm__ volatile (".chip 68k/68881\n\t"
369 "fmovemx %0,%%fp0-%%fp1\n\t"
370 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
373 : "m" (*sc->sc_fpregs),
374 "m" (*sc->sc_fpcntl));
378 if (CPU_IS_COLDFIRE) {
379 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
381 __asm__ volatile (".chip 68k/68881\n\t"
384 : : "m" (*sc->sc_fpstate));
392 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
394 unsigned char fpstate[FPCONTEXT_SIZE];
395 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
400 /* restore fpu control register */
401 if (__copy_from_user(current->thread.fpcntl,
402 uc->uc_mcontext.fpregs.f_fpcntl, 12))
404 /* restore all other fpu register */
405 if (__copy_from_user(current->thread.fp,
406 uc->uc_mcontext.fpregs.f_fpregs, 96))
411 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
413 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
414 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
415 context_size = fpstate[1];
416 /* Verify the frame format. */
417 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
418 (fpstate[0] != fpu_version))
420 if (CPU_IS_020_OR_030) {
421 if (m68k_fputype & FPU_68881 &&
422 !(context_size == 0x18 || context_size == 0xb4))
424 if (m68k_fputype & FPU_68882 &&
425 !(context_size == 0x38 || context_size == 0xd4))
427 } else if (CPU_IS_040) {
428 if (!(context_size == 0x00 ||
429 context_size == 0x28 ||
430 context_size == 0x60))
432 } else if (CPU_IS_060) {
433 if (!(fpstate[3] == 0x00 ||
434 fpstate[3] == 0x60 ||
437 } else if (CPU_IS_COLDFIRE) {
438 if (!(fpstate[3] == 0x00 ||
439 fpstate[3] == 0x05 ||
444 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
448 if (CPU_IS_COLDFIRE) {
449 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
450 "fmovel %1,%%fpcr\n\t"
451 "fmovel %2,%%fpsr\n\t"
454 : "m" (fpregs.f_fpregs[0]),
455 "m" (fpregs.f_fpcntl[0]),
456 "m" (fpregs.f_fpcntl[1]),
457 "m" (fpregs.f_fpcntl[2]));
459 __asm__ volatile (".chip 68k/68881\n\t"
460 "fmovemx %0,%%fp0-%%fp7\n\t"
461 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
464 : "m" (*fpregs.f_fpregs),
465 "m" (*fpregs.f_fpcntl));
469 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
473 if (CPU_IS_COLDFIRE) {
474 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
476 __asm__ volatile (".chip 68k/68881\n\t"
488 * Set up a signal frame.
490 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
494 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
495 memcpy(sc->sc_fpregs, current->thread.fp, 24);
499 if (CPU_IS_COLDFIRE) {
500 __asm__ volatile ("fsave %0"
501 : : "m" (*sc->sc_fpstate) : "memory");
503 __asm__ volatile (".chip 68k/68881\n\t"
506 : : "m" (*sc->sc_fpstate) : "memory");
509 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
510 fpu_version = sc->sc_fpstate[0];
511 if (CPU_IS_020_OR_030 &&
512 regs->vector >= (VEC_FPBRUC * 4) &&
513 regs->vector <= (VEC_FPNAN * 4)) {
514 /* Clear pending exception in 68882 idle frame */
515 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
516 sc->sc_fpstate[0x38] |= 1 << 3;
519 if (CPU_IS_COLDFIRE) {
520 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
521 "fmovel %%fpcr,%1\n\t"
522 "fmovel %%fpsr,%2\n\t"
524 : "=m" (sc->sc_fpregs[0]),
525 "=m" (sc->sc_fpcntl[0]),
526 "=m" (sc->sc_fpcntl[1]),
527 "=m" (sc->sc_fpcntl[2])
531 __asm__ volatile (".chip 68k/68881\n\t"
532 "fmovemx %%fp0-%%fp1,%0\n\t"
533 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
535 : "=m" (*sc->sc_fpregs),
536 "=m" (*sc->sc_fpcntl)
543 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
545 unsigned char fpstate[FPCONTEXT_SIZE];
546 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
550 /* save fpu control register */
551 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
552 current->thread.fpcntl, 12);
553 /* save all other fpu register */
554 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
555 current->thread.fp, 96);
559 if (CPU_IS_COLDFIRE) {
560 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
562 __asm__ volatile (".chip 68k/68881\n\t"
565 : : "m" (*fpstate) : "memory");
568 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
569 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
571 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
572 context_size = fpstate[1];
573 fpu_version = fpstate[0];
574 if (CPU_IS_020_OR_030 &&
575 regs->vector >= (VEC_FPBRUC * 4) &&
576 regs->vector <= (VEC_FPNAN * 4)) {
577 /* Clear pending exception in 68882 idle frame */
578 if (*(unsigned short *) fpstate == 0x1f38)
579 fpstate[0x38] |= 1 << 3;
581 if (CPU_IS_COLDFIRE) {
582 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
583 "fmovel %%fpcr,%1\n\t"
584 "fmovel %%fpsr,%2\n\t"
586 : "=m" (fpregs.f_fpregs[0]),
587 "=m" (fpregs.f_fpcntl[0]),
588 "=m" (fpregs.f_fpcntl[1]),
589 "=m" (fpregs.f_fpcntl[2])
593 __asm__ volatile (".chip 68k/68881\n\t"
594 "fmovemx %%fp0-%%fp7,%0\n\t"
595 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
597 : "=m" (*fpregs.f_fpregs),
598 "=m" (*fpregs.f_fpcntl)
602 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
606 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
611 #else /* CONFIG_FPU */
614 * For the case with no FPU configured these all do nothing.
616 static inline int restore_fpu_state(struct sigcontext *sc)
621 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
626 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
630 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
635 #endif /* CONFIG_FPU */
637 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
640 int fsize = frame_extra_sizes(formatvec >> 12);
643 * user process trying to return with weird frame format
646 printk("user process returning with weird frame format\n");
651 regs->format = formatvec >> 12;
652 regs->vector = formatvec & 0xfff;
654 struct switch_stack *sw = (struct switch_stack *)regs - 1;
655 unsigned long buf[fsize / 2]; /* yes, twice as much */
657 /* that'll make sure that expansion won't crap over data */
658 if (copy_from_user(buf + fsize / 4, fp, fsize))
661 /* point of no return */
662 regs->format = formatvec >> 12;
663 regs->vector = formatvec & 0xfff;
664 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
665 __asm__ __volatile__ (
666 #ifdef CONFIG_COLDFIRE
668 " bra ret_from_signal\n"
671 " subl %1,%/a0\n\t" /* make room on stack */
672 " movel %/a0,%/sp\n\t" /* set stack pointer */
673 /* move switch_stack and pt_regs */
674 "1: movel %0@+,%/a0@+\n\t"
676 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
679 /* copy to the gap we'd made */
680 "2: movel %4@+,%/a0@+\n\t"
682 " bral ret_from_signal\n"
684 : /* no outputs, it doesn't ever return */
685 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
686 "n" (frame_offset), "a" (buf + fsize/4)
694 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
697 struct sigcontext context;
700 /* Always make any pending restarted system calls return -EINTR */
701 current_thread_info()->restart_block.fn = do_no_restart_syscall;
703 /* get previous context */
704 if (copy_from_user(&context, usc, sizeof(context)))
707 /* restore passed registers */
708 regs->d0 = context.sc_d0;
709 regs->d1 = context.sc_d1;
710 regs->a0 = context.sc_a0;
711 regs->a1 = context.sc_a1;
712 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
713 regs->pc = context.sc_pc;
714 regs->orig_d0 = -1; /* disable syscall checks */
715 wrusp(context.sc_usp);
716 formatvec = context.sc_formatvec;
718 err = restore_fpu_state(&context);
720 if (err || mangle_kernel_stack(regs, formatvec, fp))
730 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
731 struct ucontext __user *uc)
734 greg_t __user *gregs = uc->uc_mcontext.gregs;
738 /* Always make any pending restarted system calls return -EINTR */
739 current_thread_info()->restart_block.fn = do_no_restart_syscall;
741 err = __get_user(temp, &uc->uc_mcontext.version);
742 if (temp != MCONTEXT_VERSION)
744 /* restore passed registers */
745 err |= __get_user(regs->d0, &gregs[0]);
746 err |= __get_user(regs->d1, &gregs[1]);
747 err |= __get_user(regs->d2, &gregs[2]);
748 err |= __get_user(regs->d3, &gregs[3]);
749 err |= __get_user(regs->d4, &gregs[4]);
750 err |= __get_user(regs->d5, &gregs[5]);
751 err |= __get_user(sw->d6, &gregs[6]);
752 err |= __get_user(sw->d7, &gregs[7]);
753 err |= __get_user(regs->a0, &gregs[8]);
754 err |= __get_user(regs->a1, &gregs[9]);
755 err |= __get_user(regs->a2, &gregs[10]);
756 err |= __get_user(sw->a3, &gregs[11]);
757 err |= __get_user(sw->a4, &gregs[12]);
758 err |= __get_user(sw->a5, &gregs[13]);
759 err |= __get_user(sw->a6, &gregs[14]);
760 err |= __get_user(usp, &gregs[15]);
762 err |= __get_user(regs->pc, &gregs[16]);
763 err |= __get_user(temp, &gregs[17]);
764 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
765 regs->orig_d0 = -1; /* disable syscall checks */
766 err |= __get_user(temp, &uc->uc_formatvec);
768 err |= rt_restore_fpu_state(uc);
770 if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
773 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
782 asmlinkage int do_sigreturn(unsigned long __unused)
784 struct switch_stack *sw = (struct switch_stack *) &__unused;
785 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
786 unsigned long usp = rdusp();
787 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
790 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
792 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
794 __copy_from_user(&set.sig[1], &frame->extramask,
795 sizeof(frame->extramask))))
798 sigdelsetmask(&set, ~_BLOCKABLE);
799 set_current_blocked(&set);
801 if (restore_sigcontext(regs, &frame->sc, frame + 1))
806 force_sig(SIGSEGV, current);
810 asmlinkage int do_rt_sigreturn(unsigned long __unused)
812 struct switch_stack *sw = (struct switch_stack *) &__unused;
813 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
814 unsigned long usp = rdusp();
815 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
818 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
820 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
823 sigdelsetmask(&set, ~_BLOCKABLE);
824 set_current_blocked(&set);
826 if (rt_restore_ucontext(regs, sw, &frame->uc))
831 force_sig(SIGSEGV, current);
835 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
839 sc->sc_usp = rdusp();
840 sc->sc_d0 = regs->d0;
841 sc->sc_d1 = regs->d1;
842 sc->sc_a0 = regs->a0;
843 sc->sc_a1 = regs->a1;
844 sc->sc_sr = regs->sr;
845 sc->sc_pc = regs->pc;
846 sc->sc_formatvec = regs->format << 12 | regs->vector;
847 save_a5_state(sc, regs);
848 save_fpu_state(sc, regs);
851 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
853 struct switch_stack *sw = (struct switch_stack *)regs - 1;
854 greg_t __user *gregs = uc->uc_mcontext.gregs;
857 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
858 err |= __put_user(regs->d0, &gregs[0]);
859 err |= __put_user(regs->d1, &gregs[1]);
860 err |= __put_user(regs->d2, &gregs[2]);
861 err |= __put_user(regs->d3, &gregs[3]);
862 err |= __put_user(regs->d4, &gregs[4]);
863 err |= __put_user(regs->d5, &gregs[5]);
864 err |= __put_user(sw->d6, &gregs[6]);
865 err |= __put_user(sw->d7, &gregs[7]);
866 err |= __put_user(regs->a0, &gregs[8]);
867 err |= __put_user(regs->a1, &gregs[9]);
868 err |= __put_user(regs->a2, &gregs[10]);
869 err |= __put_user(sw->a3, &gregs[11]);
870 err |= __put_user(sw->a4, &gregs[12]);
871 err |= __put_user(sw->a5, &gregs[13]);
872 err |= __put_user(sw->a6, &gregs[14]);
873 err |= __put_user(rdusp(), &gregs[15]);
874 err |= __put_user(regs->pc, &gregs[16]);
875 err |= __put_user(regs->sr, &gregs[17]);
876 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
877 err |= rt_save_fpu_state(uc, regs);
881 static inline void __user *
882 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
886 /* Default to using normal stack. */
889 /* This is the X/Open sanctioned signal stack switching. */
890 if (ka->sa.sa_flags & SA_ONSTACK) {
891 if (!sas_ss_flags(usp))
892 usp = current->sas_ss_sp + current->sas_ss_size;
894 return (void __user *)((usp - frame_size) & -8UL);
897 static int setup_frame (int sig, struct k_sigaction *ka,
898 sigset_t *set, struct pt_regs *regs)
900 struct sigframe __user *frame;
901 int fsize = frame_extra_sizes(regs->format);
902 struct sigcontext context;
907 printk ("setup_frame: Unknown frame format %#x\n",
913 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
916 err |= copy_to_user (frame + 1, regs + 1, fsize);
918 err |= __put_user((current_thread_info()->exec_domain
919 && current_thread_info()->exec_domain->signal_invmap
921 ? current_thread_info()->exec_domain->signal_invmap[sig]
925 err |= __put_user(regs->vector, &frame->code);
926 err |= __put_user(&frame->sc, &frame->psc);
929 err |= copy_to_user(frame->extramask, &set->sig[1],
930 sizeof(frame->extramask));
932 setup_sigcontext(&context, regs, set->sig[0]);
933 err |= copy_to_user (&frame->sc, &context, sizeof(context));
935 /* Set up to return from userspace. */
937 err |= __put_user(frame->retcode, &frame->pretcode);
938 /* moveq #,d0; trap #0 */
939 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
940 (long __user *)(frame->retcode));
942 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
948 push_cache ((unsigned long) &frame->retcode);
951 * Set up registers for signal handler. All the state we are about
952 * to destroy is successfully copied to sigframe.
954 wrusp ((unsigned long) frame);
955 regs->pc = (unsigned long) ka->sa.sa_handler;
959 * This is subtle; if we build more than one sigframe, all but the
960 * first one will see frame format 0 and have fsize == 0, so we won't
964 regs->stkadj = fsize;
966 /* Prepare to skip over the extra stuff in the exception frame. */
968 struct pt_regs *tregs =
969 (struct pt_regs *)((ulong)regs + regs->stkadj);
971 printk("Performing stackadjust=%04x\n", regs->stkadj);
973 /* This must be copied with decreasing addresses to
977 tregs->pc = regs->pc;
978 tregs->sr = regs->sr;
983 force_sigsegv(sig, current);
987 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
988 sigset_t *set, struct pt_regs *regs)
990 struct rt_sigframe __user *frame;
991 int fsize = frame_extra_sizes(regs->format);
996 printk ("setup_frame: Unknown frame format %#x\n",
1002 frame = get_sigframe(ka, regs, sizeof(*frame));
1005 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
1007 err |= __put_user((current_thread_info()->exec_domain
1008 && current_thread_info()->exec_domain->signal_invmap
1010 ? current_thread_info()->exec_domain->signal_invmap[sig]
1013 err |= __put_user(&frame->info, &frame->pinfo);
1014 err |= __put_user(&frame->uc, &frame->puc);
1015 err |= copy_siginfo_to_user(&frame->info, info);
1017 /* Create the ucontext. */
1018 err |= __put_user(0, &frame->uc.uc_flags);
1019 err |= __put_user(NULL, &frame->uc.uc_link);
1020 err |= __put_user((void __user *)current->sas_ss_sp,
1021 &frame->uc.uc_stack.ss_sp);
1022 err |= __put_user(sas_ss_flags(rdusp()),
1023 &frame->uc.uc_stack.ss_flags);
1024 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
1025 err |= rt_setup_ucontext(&frame->uc, regs);
1026 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
1028 /* Set up to return from userspace. */
1030 err |= __put_user(frame->retcode, &frame->pretcode);
1031 #ifdef __mcoldfire__
1032 /* movel #__NR_rt_sigreturn,d0; trap #0 */
1033 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
1034 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
1035 (long __user *)(frame->retcode + 4));
1037 /* moveq #,d0; notb d0; trap #0 */
1038 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
1039 (long __user *)(frame->retcode + 0));
1040 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1043 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
1044 #endif /* CONFIG_MMU */
1049 push_cache ((unsigned long) &frame->retcode);
1052 * Set up registers for signal handler. All the state we are about
1053 * to destroy is successfully copied to sigframe.
1055 wrusp ((unsigned long) frame);
1056 regs->pc = (unsigned long) ka->sa.sa_handler;
1060 * This is subtle; if we build more than one sigframe, all but the
1061 * first one will see frame format 0 and have fsize == 0, so we won't
1065 regs->stkadj = fsize;
1067 /* Prepare to skip over the extra stuff in the exception frame. */
1069 struct pt_regs *tregs =
1070 (struct pt_regs *)((ulong)regs + regs->stkadj);
1072 printk("Performing stackadjust=%04x\n", regs->stkadj);
1074 /* This must be copied with decreasing addresses to
1078 tregs->pc = regs->pc;
1079 tregs->sr = regs->sr;
1084 force_sigsegv(sig, current);
1089 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1092 case -ERESTARTNOHAND:
1098 case -ERESTART_RESTARTBLOCK:
1100 regs->d0 = __NR_restart_syscall;
1108 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1113 case -ERESTARTNOINTR:
1115 regs->d0 = regs->orig_d0;
1122 * OK, we're invoking a handler
1125 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
1126 sigset_t *oldset, struct pt_regs *regs)
1129 /* are we from a system call? */
1130 if (regs->orig_d0 >= 0)
1131 /* If so, check system call restarting.. */
1132 handle_restart(regs, ka, 1);
1134 /* set up the stack frame */
1135 if (ka->sa.sa_flags & SA_SIGINFO)
1136 err = setup_rt_frame(sig, ka, info, oldset, regs);
1138 err = setup_frame(sig, ka, oldset, regs);
1143 block_sigmask(ka, sig);
1145 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1146 regs->sr &= ~0x8000;
1147 send_sig(SIGTRAP, current, 1);
1150 clear_thread_flag(TIF_RESTORE_SIGMASK);
1154 * Note that 'init' is a special process: it doesn't get signals it doesn't
1155 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1158 static void do_signal(struct pt_regs *regs)
1161 struct k_sigaction ka;
1165 current->thread.esp0 = (unsigned long) regs;
1167 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1168 oldset = ¤t->saved_sigmask;
1170 oldset = ¤t->blocked;
1172 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1174 /* Whee! Actually deliver the signal. */
1175 handle_signal(signr, &ka, &info, oldset, regs);
1179 /* Did we come from a system call? */
1180 if (regs->orig_d0 >= 0)
1181 /* Restart the system call - no handlers present */
1182 handle_restart(regs, NULL, 0);
1184 /* If there's no signal to deliver, we just restore the saved mask. */
1185 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
1186 clear_thread_flag(TIF_RESTORE_SIGMASK);
1187 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
1191 void do_notify_resume(struct pt_regs *regs)
1193 if (test_thread_flag(TIF_SIGPENDING))
1196 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) {
1197 tracehook_notify_resume(regs);
1198 if (current->replacement_session_keyring)
1199 key_replace_session_keyring();