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>
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>
53 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
58 * Handle the slight differences in classic 68k and ColdFire trap frames.
60 #ifdef CONFIG_COLDFIRE
65 #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
68 static const int frame_size_change[16] = {
69 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
70 [2] = sizeof(((struct frame *)0)->un.fmt2),
71 [3] = sizeof(((struct frame *)0)->un.fmt3),
73 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
74 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
75 [7] = sizeof(((struct frame *)0)->un.fmt7),
76 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
77 [9] = sizeof(((struct frame *)0)->un.fmt9),
78 [10] = sizeof(((struct frame *)0)->un.fmta),
79 [11] = sizeof(((struct frame *)0)->un.fmtb),
80 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
81 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
82 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
83 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
86 static inline int frame_extra_sizes(int f)
88 return frame_size_change[f];
91 int handle_kernel_fault(struct pt_regs *regs)
93 const struct exception_table_entry *fixup;
94 struct pt_regs *tregs;
96 /* Are we prepared to handle this kernel fault? */
97 fixup = search_exception_tables(regs->pc);
101 /* Create a new four word stack frame, discarding the old one. */
102 regs->stkadj = frame_extra_sizes(regs->format);
103 tregs = (struct pt_regs *)((long)regs + regs->stkadj);
104 tregs->vector = regs->vector;
105 tregs->format = FORMAT;
106 tregs->pc = fixup->fixup;
107 tregs->sr = regs->sr;
112 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
114 if (regs->orig_d0 < 0)
117 case -ERESTARTNOHAND:
119 case -ERESTARTNOINTR:
120 regs->d0 = regs->orig_d0;
127 static inline void push_cache (unsigned long vaddr)
130 * Using the old cache_push_v() was really a big waste.
132 * What we are trying to do is to flush 8 bytes to ram.
133 * Flushing 2 cache lines of 16 bytes is much cheaper than
134 * flushing 1 or 2 pages, as previously done in
141 __asm__ __volatile__ (".chip 68040\n\t"
144 "movec %%mmusr,%0\n\t"
150 temp |= vaddr & ~PAGE_MASK;
152 __asm__ __volatile__ (".chip 68040\n\t"
154 "cpushl %%bc,(%0)\n\t"
158 else if (CPU_IS_060) {
160 __asm__ __volatile__ (".chip 68060\n\t"
165 __asm__ __volatile__ (".chip 68060\n\t"
166 "cpushl %%bc,(%0)\n\t"
169 } else if (!CPU_IS_COLDFIRE) {
171 * 68030/68020 have no writeback cache;
172 * still need to clear icache.
173 * Note that vaddr is guaranteed to be long word aligned.
176 asm volatile ("movec %%cacr,%0" : "=r" (temp));
178 asm volatile ("movec %0,%%caar\n\t"
180 : : "r" (vaddr), "r" (temp));
181 asm volatile ("movec %0,%%caar\n\t"
183 : : "r" (vaddr + 4), "r" (temp));
187 static inline void adjustformat(struct pt_regs *regs)
191 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
195 #else /* CONFIG_MMU */
197 void ret_from_user_signal(void);
198 void ret_from_user_rt_signal(void);
200 static inline int frame_extra_sizes(int f)
202 /* No frame size adjustments required on non-MMU CPUs */
206 static inline void adjustformat(struct pt_regs *regs)
208 ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
210 * set format byte to make stack appear modulo 4, which it will
211 * be when doing the rte
216 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
218 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
221 static inline void push_cache(unsigned long vaddr)
225 #endif /* CONFIG_MMU */
228 * Atomically swap in the new signal mask, and wait for a signal.
231 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
234 spin_lock_irq(¤t->sighand->siglock);
235 current->saved_sigmask = current->blocked;
236 siginitset(¤t->blocked, mask);
238 spin_unlock_irq(¤t->sighand->siglock);
240 current->state = TASK_INTERRUPTIBLE;
242 set_restore_sigmask();
244 return -ERESTARTNOHAND;
248 sys_sigaction(int sig, const struct old_sigaction __user *act,
249 struct old_sigaction __user *oact)
251 struct k_sigaction new_ka, old_ka;
256 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
257 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
258 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
259 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
260 __get_user(mask, &act->sa_mask))
262 siginitset(&new_ka.sa.sa_mask, mask);
265 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
268 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
269 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
270 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
271 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
272 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
280 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
282 return do_sigaltstack(uss, uoss, rdusp());
287 * Do a signal return; undo the signal stack.
289 * Keep the return code on the stack quadword aligned!
290 * That makes the cache flush below easier.
295 char __user *pretcode;
298 struct sigcontext __user *psc;
300 unsigned long extramask[_NSIG_WORDS-1];
301 struct sigcontext sc;
306 char __user *pretcode;
308 struct siginfo __user *pinfo;
315 #define FPCONTEXT_SIZE 216
316 #define uc_fpstate uc_filler[0]
317 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
318 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
322 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
324 static inline int restore_fpu_state(struct sigcontext *sc)
329 /* restore registers */
330 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
331 memcpy(current->thread.fp, sc->sc_fpregs, 24);
335 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
336 /* Verify the frame format. */
337 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
338 (sc->sc_fpstate[0] != fpu_version))
340 if (CPU_IS_020_OR_030) {
341 if (m68k_fputype & FPU_68881 &&
342 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
344 if (m68k_fputype & FPU_68882 &&
345 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
347 } else if (CPU_IS_040) {
348 if (!(sc->sc_fpstate[1] == 0x00 ||
349 sc->sc_fpstate[1] == 0x28 ||
350 sc->sc_fpstate[1] == 0x60))
352 } else if (CPU_IS_060) {
353 if (!(sc->sc_fpstate[3] == 0x00 ||
354 sc->sc_fpstate[3] == 0x60 ||
355 sc->sc_fpstate[3] == 0xe0))
357 } else if (CPU_IS_COLDFIRE) {
358 if (!(sc->sc_fpstate[0] == 0x00 ||
359 sc->sc_fpstate[0] == 0x05 ||
360 sc->sc_fpstate[0] == 0xe5))
365 if (CPU_IS_COLDFIRE) {
366 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t"
367 "fmovel %1,%%fpcr\n\t"
368 "fmovel %2,%%fpsr\n\t"
371 : "m" (sc->sc_fpregs[0]),
372 "m" (sc->sc_fpcntl[0]),
373 "m" (sc->sc_fpcntl[1]),
374 "m" (sc->sc_fpcntl[2]));
376 __asm__ volatile (".chip 68k/68881\n\t"
377 "fmovemx %0,%%fp0-%%fp1\n\t"
378 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
381 : "m" (*sc->sc_fpregs),
382 "m" (*sc->sc_fpcntl));
386 if (CPU_IS_COLDFIRE) {
387 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate));
389 __asm__ volatile (".chip 68k/68881\n\t"
392 : : "m" (*sc->sc_fpstate));
400 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
402 unsigned char fpstate[FPCONTEXT_SIZE];
403 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
408 /* restore fpu control register */
409 if (__copy_from_user(current->thread.fpcntl,
410 uc->uc_mcontext.fpregs.f_fpcntl, 12))
412 /* restore all other fpu register */
413 if (__copy_from_user(current->thread.fp,
414 uc->uc_mcontext.fpregs.f_fpregs, 96))
419 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
421 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
422 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
423 context_size = fpstate[1];
424 /* Verify the frame format. */
425 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) &&
426 (fpstate[0] != fpu_version))
428 if (CPU_IS_020_OR_030) {
429 if (m68k_fputype & FPU_68881 &&
430 !(context_size == 0x18 || context_size == 0xb4))
432 if (m68k_fputype & FPU_68882 &&
433 !(context_size == 0x38 || context_size == 0xd4))
435 } else if (CPU_IS_040) {
436 if (!(context_size == 0x00 ||
437 context_size == 0x28 ||
438 context_size == 0x60))
440 } else if (CPU_IS_060) {
441 if (!(fpstate[3] == 0x00 ||
442 fpstate[3] == 0x60 ||
445 } else if (CPU_IS_COLDFIRE) {
446 if (!(fpstate[3] == 0x00 ||
447 fpstate[3] == 0x05 ||
452 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
456 if (CPU_IS_COLDFIRE) {
457 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t"
458 "fmovel %1,%%fpcr\n\t"
459 "fmovel %2,%%fpsr\n\t"
462 : "m" (fpregs.f_fpregs[0]),
463 "m" (fpregs.f_fpcntl[0]),
464 "m" (fpregs.f_fpcntl[1]),
465 "m" (fpregs.f_fpcntl[2]));
467 __asm__ volatile (".chip 68k/68881\n\t"
468 "fmovemx %0,%%fp0-%%fp7\n\t"
469 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
472 : "m" (*fpregs.f_fpregs),
473 "m" (*fpregs.f_fpcntl));
477 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
481 if (CPU_IS_COLDFIRE) {
482 __asm__ volatile ("frestore %0" : : "m" (*fpstate));
484 __asm__ volatile (".chip 68k/68881\n\t"
496 * Set up a signal frame.
498 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
502 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
503 memcpy(sc->sc_fpregs, current->thread.fp, 24);
507 if (CPU_IS_COLDFIRE) {
508 __asm__ volatile ("fsave %0"
509 : : "m" (*sc->sc_fpstate) : "memory");
511 __asm__ volatile (".chip 68k/68881\n\t"
514 : : "m" (*sc->sc_fpstate) : "memory");
517 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
518 fpu_version = sc->sc_fpstate[0];
519 if (CPU_IS_020_OR_030 &&
520 regs->vector >= (VEC_FPBRUC * 4) &&
521 regs->vector <= (VEC_FPNAN * 4)) {
522 /* Clear pending exception in 68882 idle frame */
523 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
524 sc->sc_fpstate[0x38] |= 1 << 3;
527 if (CPU_IS_COLDFIRE) {
528 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
529 "fmovel %%fpcr,%1\n\t"
530 "fmovel %%fpsr,%2\n\t"
532 : "=m" (sc->sc_fpregs[0]),
533 "=m" (sc->sc_fpcntl[0]),
534 "=m" (sc->sc_fpcntl[1]),
535 "=m" (sc->sc_fpcntl[2])
539 __asm__ volatile (".chip 68k/68881\n\t"
540 "fmovemx %%fp0-%%fp1,%0\n\t"
541 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
543 : "=m" (*sc->sc_fpregs),
544 "=m" (*sc->sc_fpcntl)
551 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
553 unsigned char fpstate[FPCONTEXT_SIZE];
554 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
558 /* save fpu control register */
559 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
560 current->thread.fpcntl, 12);
561 /* save all other fpu register */
562 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
563 current->thread.fp, 96);
567 if (CPU_IS_COLDFIRE) {
568 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
570 __asm__ volatile (".chip 68k/68881\n\t"
573 : : "m" (*fpstate) : "memory");
576 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
577 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
579 if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
580 context_size = fpstate[1];
581 fpu_version = fpstate[0];
582 if (CPU_IS_020_OR_030 &&
583 regs->vector >= (VEC_FPBRUC * 4) &&
584 regs->vector <= (VEC_FPNAN * 4)) {
585 /* Clear pending exception in 68882 idle frame */
586 if (*(unsigned short *) fpstate == 0x1f38)
587 fpstate[0x38] |= 1 << 3;
589 if (CPU_IS_COLDFIRE) {
590 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
591 "fmovel %%fpcr,%1\n\t"
592 "fmovel %%fpsr,%2\n\t"
594 : "=m" (fpregs.f_fpregs[0]),
595 "=m" (fpregs.f_fpcntl[0]),
596 "=m" (fpregs.f_fpcntl[1]),
597 "=m" (fpregs.f_fpcntl[2])
601 __asm__ volatile (".chip 68k/68881\n\t"
602 "fmovemx %%fp0-%%fp7,%0\n\t"
603 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
605 : "=m" (*fpregs.f_fpregs),
606 "=m" (*fpregs.f_fpcntl)
610 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
614 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
619 #else /* CONFIG_FPU */
622 * For the case with no FPU configured these all do nothing.
624 static inline int restore_fpu_state(struct sigcontext *sc)
629 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
634 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
638 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
643 #endif /* CONFIG_FPU */
645 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
648 int fsize = frame_extra_sizes(formatvec >> 12);
651 * user process trying to return with weird frame format
654 printk("user process returning with weird frame format\n");
659 regs->format = formatvec >> 12;
660 regs->vector = formatvec & 0xfff;
662 struct switch_stack *sw = (struct switch_stack *)regs - 1;
663 unsigned long buf[fsize / 2]; /* yes, twice as much */
665 /* that'll make sure that expansion won't crap over data */
666 if (copy_from_user(buf + fsize / 4, fp, fsize))
669 /* point of no return */
670 regs->format = formatvec >> 12;
671 regs->vector = formatvec & 0xfff;
672 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
673 __asm__ __volatile__ (
674 #ifdef CONFIG_COLDFIRE
676 " bra ret_from_signal\n"
679 " subl %1,%/a0\n\t" /* make room on stack */
680 " movel %/a0,%/sp\n\t" /* set stack pointer */
681 /* move switch_stack and pt_regs */
682 "1: movel %0@+,%/a0@+\n\t"
684 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
687 /* copy to the gap we'd made */
688 "2: movel %4@+,%/a0@+\n\t"
690 " bral ret_from_signal\n"
692 : /* no outputs, it doesn't ever return */
693 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
694 "n" (frame_offset), "a" (buf + fsize/4)
702 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
705 struct sigcontext context;
708 /* Always make any pending restarted system calls return -EINTR */
709 current_thread_info()->restart_block.fn = do_no_restart_syscall;
711 /* get previous context */
712 if (copy_from_user(&context, usc, sizeof(context)))
715 /* restore passed registers */
716 regs->d0 = context.sc_d0;
717 regs->d1 = context.sc_d1;
718 regs->a0 = context.sc_a0;
719 regs->a1 = context.sc_a1;
720 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
721 regs->pc = context.sc_pc;
722 regs->orig_d0 = -1; /* disable syscall checks */
723 wrusp(context.sc_usp);
724 formatvec = context.sc_formatvec;
726 err = restore_fpu_state(&context);
728 if (err || mangle_kernel_stack(regs, formatvec, fp))
738 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
739 struct ucontext __user *uc)
742 greg_t __user *gregs = uc->uc_mcontext.gregs;
746 /* Always make any pending restarted system calls return -EINTR */
747 current_thread_info()->restart_block.fn = do_no_restart_syscall;
749 err = __get_user(temp, &uc->uc_mcontext.version);
750 if (temp != MCONTEXT_VERSION)
752 /* restore passed registers */
753 err |= __get_user(regs->d0, &gregs[0]);
754 err |= __get_user(regs->d1, &gregs[1]);
755 err |= __get_user(regs->d2, &gregs[2]);
756 err |= __get_user(regs->d3, &gregs[3]);
757 err |= __get_user(regs->d4, &gregs[4]);
758 err |= __get_user(regs->d5, &gregs[5]);
759 err |= __get_user(sw->d6, &gregs[6]);
760 err |= __get_user(sw->d7, &gregs[7]);
761 err |= __get_user(regs->a0, &gregs[8]);
762 err |= __get_user(regs->a1, &gregs[9]);
763 err |= __get_user(regs->a2, &gregs[10]);
764 err |= __get_user(sw->a3, &gregs[11]);
765 err |= __get_user(sw->a4, &gregs[12]);
766 err |= __get_user(sw->a5, &gregs[13]);
767 err |= __get_user(sw->a6, &gregs[14]);
768 err |= __get_user(usp, &gregs[15]);
770 err |= __get_user(regs->pc, &gregs[16]);
771 err |= __get_user(temp, &gregs[17]);
772 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
773 regs->orig_d0 = -1; /* disable syscall checks */
774 err |= __get_user(temp, &uc->uc_formatvec);
776 err |= rt_restore_fpu_state(uc);
778 if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
781 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
790 asmlinkage int do_sigreturn(unsigned long __unused)
792 struct switch_stack *sw = (struct switch_stack *) &__unused;
793 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
794 unsigned long usp = rdusp();
795 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
798 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
800 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
802 __copy_from_user(&set.sig[1], &frame->extramask,
803 sizeof(frame->extramask))))
806 sigdelsetmask(&set, ~_BLOCKABLE);
807 current->blocked = set;
810 if (restore_sigcontext(regs, &frame->sc, frame + 1))
815 force_sig(SIGSEGV, current);
819 asmlinkage int do_rt_sigreturn(unsigned long __unused)
821 struct switch_stack *sw = (struct switch_stack *) &__unused;
822 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
823 unsigned long usp = rdusp();
824 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
827 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
829 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
832 sigdelsetmask(&set, ~_BLOCKABLE);
833 current->blocked = set;
836 if (rt_restore_ucontext(regs, sw, &frame->uc))
841 force_sig(SIGSEGV, current);
845 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
849 sc->sc_usp = rdusp();
850 sc->sc_d0 = regs->d0;
851 sc->sc_d1 = regs->d1;
852 sc->sc_a0 = regs->a0;
853 sc->sc_a1 = regs->a1;
854 sc->sc_sr = regs->sr;
855 sc->sc_pc = regs->pc;
856 sc->sc_formatvec = regs->format << 12 | regs->vector;
857 save_a5_state(sc, regs);
858 save_fpu_state(sc, regs);
861 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
863 struct switch_stack *sw = (struct switch_stack *)regs - 1;
864 greg_t __user *gregs = uc->uc_mcontext.gregs;
867 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
868 err |= __put_user(regs->d0, &gregs[0]);
869 err |= __put_user(regs->d1, &gregs[1]);
870 err |= __put_user(regs->d2, &gregs[2]);
871 err |= __put_user(regs->d3, &gregs[3]);
872 err |= __put_user(regs->d4, &gregs[4]);
873 err |= __put_user(regs->d5, &gregs[5]);
874 err |= __put_user(sw->d6, &gregs[6]);
875 err |= __put_user(sw->d7, &gregs[7]);
876 err |= __put_user(regs->a0, &gregs[8]);
877 err |= __put_user(regs->a1, &gregs[9]);
878 err |= __put_user(regs->a2, &gregs[10]);
879 err |= __put_user(sw->a3, &gregs[11]);
880 err |= __put_user(sw->a4, &gregs[12]);
881 err |= __put_user(sw->a5, &gregs[13]);
882 err |= __put_user(sw->a6, &gregs[14]);
883 err |= __put_user(rdusp(), &gregs[15]);
884 err |= __put_user(regs->pc, &gregs[16]);
885 err |= __put_user(regs->sr, &gregs[17]);
886 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
887 err |= rt_save_fpu_state(uc, regs);
891 static inline void __user *
892 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
896 /* Default to using normal stack. */
899 /* This is the X/Open sanctioned signal stack switching. */
900 if (ka->sa.sa_flags & SA_ONSTACK) {
901 if (!sas_ss_flags(usp))
902 usp = current->sas_ss_sp + current->sas_ss_size;
904 return (void __user *)((usp - frame_size) & -8UL);
907 static int setup_frame (int sig, struct k_sigaction *ka,
908 sigset_t *set, struct pt_regs *regs)
910 struct sigframe __user *frame;
911 int fsize = frame_extra_sizes(regs->format);
912 struct sigcontext context;
917 printk ("setup_frame: Unknown frame format %#x\n",
923 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
926 err |= copy_to_user (frame + 1, regs + 1, fsize);
928 err |= __put_user((current_thread_info()->exec_domain
929 && current_thread_info()->exec_domain->signal_invmap
931 ? current_thread_info()->exec_domain->signal_invmap[sig]
935 err |= __put_user(regs->vector, &frame->code);
936 err |= __put_user(&frame->sc, &frame->psc);
939 err |= copy_to_user(frame->extramask, &set->sig[1],
940 sizeof(frame->extramask));
942 setup_sigcontext(&context, regs, set->sig[0]);
943 err |= copy_to_user (&frame->sc, &context, sizeof(context));
945 /* Set up to return from userspace. */
947 err |= __put_user(frame->retcode, &frame->pretcode);
948 /* moveq #,d0; trap #0 */
949 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
950 (long __user *)(frame->retcode));
952 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
958 push_cache ((unsigned long) &frame->retcode);
961 * Set up registers for signal handler. All the state we are about
962 * to destroy is successfully copied to sigframe.
964 wrusp ((unsigned long) frame);
965 regs->pc = (unsigned long) ka->sa.sa_handler;
969 * This is subtle; if we build more than one sigframe, all but the
970 * first one will see frame format 0 and have fsize == 0, so we won't
974 regs->stkadj = fsize;
976 /* Prepare to skip over the extra stuff in the exception frame. */
978 struct pt_regs *tregs =
979 (struct pt_regs *)((ulong)regs + regs->stkadj);
981 printk("Performing stackadjust=%04x\n", regs->stkadj);
983 /* This must be copied with decreasing addresses to
987 tregs->pc = regs->pc;
988 tregs->sr = regs->sr;
993 force_sigsegv(sig, current);
997 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
998 sigset_t *set, struct pt_regs *regs)
1000 struct rt_sigframe __user *frame;
1001 int fsize = frame_extra_sizes(regs->format);
1006 printk ("setup_frame: Unknown frame format %#x\n",
1012 frame = get_sigframe(ka, regs, sizeof(*frame));
1015 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
1017 err |= __put_user((current_thread_info()->exec_domain
1018 && current_thread_info()->exec_domain->signal_invmap
1020 ? current_thread_info()->exec_domain->signal_invmap[sig]
1023 err |= __put_user(&frame->info, &frame->pinfo);
1024 err |= __put_user(&frame->uc, &frame->puc);
1025 err |= copy_siginfo_to_user(&frame->info, info);
1027 /* Create the ucontext. */
1028 err |= __put_user(0, &frame->uc.uc_flags);
1029 err |= __put_user(NULL, &frame->uc.uc_link);
1030 err |= __put_user((void __user *)current->sas_ss_sp,
1031 &frame->uc.uc_stack.ss_sp);
1032 err |= __put_user(sas_ss_flags(rdusp()),
1033 &frame->uc.uc_stack.ss_flags);
1034 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
1035 err |= rt_setup_ucontext(&frame->uc, regs);
1036 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
1038 /* Set up to return from userspace. */
1040 err |= __put_user(frame->retcode, &frame->pretcode);
1041 #ifdef __mcoldfire__
1042 /* movel #__NR_rt_sigreturn,d0; trap #0 */
1043 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0));
1044 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16),
1045 (long __user *)(frame->retcode + 4));
1047 /* moveq #,d0; notb d0; trap #0 */
1048 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
1049 (long __user *)(frame->retcode + 0));
1050 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
1053 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
1054 #endif /* CONFIG_MMU */
1059 push_cache ((unsigned long) &frame->retcode);
1062 * Set up registers for signal handler. All the state we are about
1063 * to destroy is successfully copied to sigframe.
1065 wrusp ((unsigned long) frame);
1066 regs->pc = (unsigned long) ka->sa.sa_handler;
1070 * This is subtle; if we build more than one sigframe, all but the
1071 * first one will see frame format 0 and have fsize == 0, so we won't
1075 regs->stkadj = fsize;
1077 /* Prepare to skip over the extra stuff in the exception frame. */
1079 struct pt_regs *tregs =
1080 (struct pt_regs *)((ulong)regs + regs->stkadj);
1082 printk("Performing stackadjust=%04x\n", regs->stkadj);
1084 /* This must be copied with decreasing addresses to
1088 tregs->pc = regs->pc;
1089 tregs->sr = regs->sr;
1094 force_sigsegv(sig, current);
1099 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
1102 case -ERESTARTNOHAND:
1108 case -ERESTART_RESTARTBLOCK:
1110 regs->d0 = __NR_restart_syscall;
1118 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
1123 case -ERESTARTNOINTR:
1125 regs->d0 = regs->orig_d0;
1132 * OK, we're invoking a handler
1135 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
1136 sigset_t *oldset, struct pt_regs *regs)
1139 /* are we from a system call? */
1140 if (regs->orig_d0 >= 0)
1141 /* If so, check system call restarting.. */
1142 handle_restart(regs, ka, 1);
1144 /* set up the stack frame */
1145 if (ka->sa.sa_flags & SA_SIGINFO)
1146 err = setup_rt_frame(sig, ka, info, oldset, regs);
1148 err = setup_frame(sig, ka, oldset, regs);
1153 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
1154 if (!(ka->sa.sa_flags & SA_NODEFER))
1155 sigaddset(¤t->blocked,sig);
1156 recalc_sigpending();
1158 if (test_thread_flag(TIF_DELAYED_TRACE)) {
1159 regs->sr &= ~0x8000;
1160 send_sig(SIGTRAP, current, 1);
1163 clear_thread_flag(TIF_RESTORE_SIGMASK);
1167 * Note that 'init' is a special process: it doesn't get signals it doesn't
1168 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1171 asmlinkage void do_signal(struct pt_regs *regs)
1174 struct k_sigaction ka;
1178 current->thread.esp0 = (unsigned long) regs;
1180 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1181 oldset = ¤t->saved_sigmask;
1183 oldset = ¤t->blocked;
1185 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1187 /* Whee! Actually deliver the signal. */
1188 handle_signal(signr, &ka, &info, oldset, regs);
1192 /* Did we come from a system call? */
1193 if (regs->orig_d0 >= 0)
1194 /* Restart the system call - no handlers present */
1195 handle_restart(regs, NULL, 0);
1197 /* If there's no signal to deliver, we just restore the saved mask. */
1198 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
1199 clear_thread_flag(TIF_RESTORE_SIGMASK);
1200 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);