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)))
55 static 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), */
73 int handle_kernel_fault(struct pt_regs *regs)
75 const struct exception_table_entry *fixup;
76 struct pt_regs *tregs;
78 /* Are we prepared to handle this kernel fault? */
79 fixup = search_exception_tables(regs->pc);
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;
88 tregs->pc = fixup->fixup;
95 * Atomically swap in the new signal mask, and wait for a signal.
98 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
101 spin_lock_irq(¤t->sighand->siglock);
102 current->saved_sigmask = current->blocked;
103 siginitset(¤t->blocked, mask);
105 spin_unlock_irq(¤t->sighand->siglock);
107 current->state = TASK_INTERRUPTIBLE;
109 set_restore_sigmask();
111 return -ERESTARTNOHAND;
115 sys_sigaction(int sig, const struct old_sigaction __user *act,
116 struct old_sigaction __user *oact)
118 struct k_sigaction new_ka, old_ka;
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))
129 siginitset(&new_ka.sa.sa_mask, mask);
132 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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))
147 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
149 return do_sigaltstack(uss, uoss, rdusp());
154 * Do a signal return; undo the signal stack.
156 * Keep the return code on the stack quadword aligned!
157 * That makes the cache flush below easier.
162 char __user *pretcode;
165 struct sigcontext __user *psc;
167 unsigned long extramask[_NSIG_WORDS-1];
168 struct sigcontext sc;
173 char __user *pretcode;
175 struct siginfo __user *pinfo;
183 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
185 static inline int restore_fpu_state(struct sigcontext *sc)
190 /* restore registers */
191 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
192 memcpy(current->thread.fp, sc->sc_fpregs, 24);
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))
200 if (CPU_IS_020_OR_030) {
201 if (m68k_fputype & FPU_68881 &&
202 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
204 if (m68k_fputype & FPU_68882 &&
205 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
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))
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))
220 __asm__ volatile (".chip 68k/68881\n\t"
221 "fmovemx %0,%%fp0-%%fp1\n\t"
222 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
225 : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl));
227 __asm__ volatile (".chip 68k/68881\n\t"
229 ".chip 68k" : : "m" (*sc->sc_fpstate));
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]
241 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
243 unsigned char fpstate[FPCONTEXT_SIZE];
244 int context_size = CPU_IS_060 ? 8 : 0;
249 /* restore fpu control register */
250 if (__copy_from_user(current->thread.fpcntl,
251 uc->uc_mcontext.fpregs.f_fpcntl, 12))
253 /* restore all other fpu register */
254 if (__copy_from_user(current->thread.fp,
255 uc->uc_mcontext.fpregs.f_fpregs, 96))
260 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
262 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
264 context_size = fpstate[1];
265 /* Verify the frame format. */
266 if (!CPU_IS_060 && (fpstate[0] != fpu_version))
268 if (CPU_IS_020_OR_030) {
269 if (m68k_fputype & FPU_68881 &&
270 !(context_size == 0x18 || context_size == 0xb4))
272 if (m68k_fputype & FPU_68882 &&
273 !(context_size == 0x38 || context_size == 0xd4))
275 } else if (CPU_IS_040) {
276 if (!(context_size == 0x00 ||
277 context_size == 0x28 ||
278 context_size == 0x60))
280 } else if (CPU_IS_060) {
281 if (!(fpstate[3] == 0x00 ||
282 fpstate[3] == 0x60 ||
287 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
290 __asm__ volatile (".chip 68k/68881\n\t"
291 "fmovemx %0,%%fp0-%%fp7\n\t"
292 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
295 : "m" (*fpregs.f_fpregs),
296 "m" (*fpregs.f_fpcntl));
299 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
302 __asm__ volatile (".chip 68k/68881\n\t"
304 ".chip 68k" : : "m" (*fpstate));
311 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
314 int fsize = frame_extra_sizes[formatvec >> 12];
317 * user process trying to return with weird frame format
320 printk("user process returning with weird frame format\n");
325 regs->format = formatvec >> 12;
326 regs->vector = formatvec & 0xfff;
328 struct switch_stack *sw = (struct switch_stack *)regs - 1;
329 unsigned long buf[fsize / 2]; /* yes, twice as much */
331 /* that'll make sure that expansion won't crap over data */
332 if (copy_from_user(buf + fsize / 4, fp, fsize))
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))
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"
346 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
349 /* copy to the gap we'd made */
350 "2: movel %4@+,%/a0@+\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)
363 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp)
366 struct sigcontext context;
369 /* Always make any pending restarted system calls return -EINTR */
370 current_thread_info()->restart_block.fn = do_no_restart_syscall;
372 /* get previous context */
373 if (copy_from_user(&context, usc, sizeof(context)))
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;
387 err = restore_fpu_state(&context);
389 if (err || mangle_kernel_stack(regs, formatvec, fp))
399 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
400 struct ucontext __user *uc)
403 greg_t __user *gregs = uc->uc_mcontext.gregs;
407 /* Always make any pending restarted system calls return -EINTR */
408 current_thread_info()->restart_block.fn = do_no_restart_syscall;
410 err = __get_user(temp, &uc->uc_mcontext.version);
411 if (temp != MCONTEXT_VERSION)
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]);
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);
437 err |= rt_restore_fpu_state(uc);
439 if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
442 if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
451 asmlinkage int do_sigreturn(unsigned long __unused)
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);
459 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
461 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
463 __copy_from_user(&set.sig[1], &frame->extramask,
464 sizeof(frame->extramask))))
467 sigdelsetmask(&set, ~_BLOCKABLE);
468 current->blocked = set;
471 if (restore_sigcontext(regs, &frame->sc, frame + 1))
476 force_sig(SIGSEGV, current);
480 asmlinkage int do_rt_sigreturn(unsigned long __unused)
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);
488 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
490 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
493 sigdelsetmask(&set, ~_BLOCKABLE);
494 current->blocked = set;
497 if (rt_restore_ucontext(regs, sw, &frame->uc))
502 force_sig(SIGSEGV, current);
507 * Set up a signal frame.
510 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
514 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
515 memcpy(sc->sc_fpregs, current->thread.fp, 24);
519 __asm__ volatile (".chip 68k/68881\n\t"
522 : : "m" (*sc->sc_fpstate) : "memory");
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;
533 __asm__ volatile (".chip 68k/68881\n\t"
534 "fmovemx %%fp0-%%fp1,%0\n\t"
535 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
537 : "=m" (*sc->sc_fpregs),
538 "=m" (*sc->sc_fpcntl)
544 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
546 unsigned char fpstate[FPCONTEXT_SIZE];
547 int context_size = CPU_IS_060 ? 8 : 0;
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);
560 __asm__ volatile (".chip 68k/68881\n\t"
563 : : "m" (*fpstate) : "memory");
565 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
566 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
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;
578 __asm__ volatile (".chip 68k/68881\n\t"
579 "fmovemx %%fp0-%%fp7,%0\n\t"
580 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
582 : "=m" (*fpregs.f_fpregs),
583 "=m" (*fpregs.f_fpcntl)
586 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
590 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
595 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
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);
610 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
612 struct switch_stack *sw = (struct switch_stack *)regs - 1;
613 greg_t __user *gregs = uc->uc_mcontext.gregs;
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);
640 static inline void push_cache (unsigned long vaddr)
643 * Using the old cache_push_v() was really a big waste.
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
654 __asm__ __volatile__ (".chip 68040\n\t"
657 "movec %%mmusr,%0\n\t"
663 temp |= vaddr & ~PAGE_MASK;
665 __asm__ __volatile__ (".chip 68040\n\t"
667 "cpushl %%bc,(%0)\n\t"
671 else if (CPU_IS_060) {
673 __asm__ __volatile__ (".chip 68060\n\t"
678 __asm__ __volatile__ (".chip 68060\n\t"
679 "cpushl %%bc,(%0)\n\t"
685 * 68030/68020 have no writeback cache;
686 * still need to clear icache.
687 * Note that vaddr is guaranteed to be long word aligned.
690 asm volatile ("movec %%cacr,%0" : "=r" (temp));
692 asm volatile ("movec %0,%%caar\n\t"
694 : : "r" (vaddr), "r" (temp));
695 asm volatile ("movec %0,%%caar\n\t"
697 : : "r" (vaddr + 4), "r" (temp));
701 static inline void __user *
702 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
706 /* Default to using normal stack. */
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;
714 return (void __user *)((usp - frame_size) & -8UL);
717 static int setup_frame (int sig, struct k_sigaction *ka,
718 sigset_t *set, struct pt_regs *regs)
720 struct sigframe __user *frame;
721 int fsize = frame_extra_sizes[regs->format];
722 struct sigcontext context;
727 printk ("setup_frame: Unknown frame format %#x\n",
733 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
736 err |= copy_to_user (frame + 1, regs + 1, fsize);
738 err |= __put_user((current_thread_info()->exec_domain
739 && current_thread_info()->exec_domain->signal_invmap
741 ? current_thread_info()->exec_domain->signal_invmap[sig]
745 err |= __put_user(regs->vector, &frame->code);
746 err |= __put_user(&frame->sc, &frame->psc);
749 err |= copy_to_user(frame->extramask, &set->sig[1],
750 sizeof(frame->extramask));
752 setup_sigcontext(&context, regs, set->sig[0]);
753 err |= copy_to_user (&frame->sc, &context, sizeof(context));
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));
764 push_cache ((unsigned long) &frame->retcode);
767 * Set up registers for signal handler. All the state we are about
768 * to destroy is successfully copied to sigframe.
770 wrusp ((unsigned long) frame);
771 regs->pc = (unsigned long) ka->sa.sa_handler;
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
779 regs->stkadj = fsize;
781 /* Prepare to skip over the extra stuff in the exception frame. */
783 struct pt_regs *tregs =
784 (struct pt_regs *)((ulong)regs + regs->stkadj);
786 printk("Performing stackadjust=%04x\n", regs->stkadj);
788 /* This must be copied with decreasing addresses to
792 tregs->pc = regs->pc;
793 tregs->sr = regs->sr;
798 force_sigsegv(sig, current);
802 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
803 sigset_t *set, struct pt_regs *regs)
805 struct rt_sigframe __user *frame;
806 int fsize = frame_extra_sizes[regs->format];
811 printk ("setup_frame: Unknown frame format %#x\n",
817 frame = get_sigframe(ka, regs, sizeof(*frame));
820 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
822 err |= __put_user((current_thread_info()->exec_domain
823 && current_thread_info()->exec_domain->signal_invmap
825 ? current_thread_info()->exec_domain->signal_invmap[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);
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));
843 /* Set up to return from userspace. */
844 err |= __put_user(frame->retcode, &frame->pretcode);
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));
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));
860 push_cache ((unsigned long) &frame->retcode);
863 * Set up registers for signal handler. All the state we are about
864 * to destroy is successfully copied to sigframe.
866 wrusp ((unsigned long) frame);
867 regs->pc = (unsigned long) ka->sa.sa_handler;
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
875 regs->stkadj = fsize;
877 /* Prepare to skip over the extra stuff in the exception frame. */
879 struct pt_regs *tregs =
880 (struct pt_regs *)((ulong)regs + regs->stkadj);
882 printk("Performing stackadjust=%04x\n", regs->stkadj);
884 /* This must be copied with decreasing addresses to
888 tregs->pc = regs->pc;
889 tregs->sr = regs->sr;
894 force_sigsegv(sig, current);
899 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
902 case -ERESTARTNOHAND:
908 case -ERESTART_RESTARTBLOCK:
910 regs->d0 = __NR_restart_syscall;
918 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
923 case -ERESTARTNOINTR:
925 regs->d0 = regs->orig_d0;
931 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
933 if (regs->orig_d0 < 0)
936 case -ERESTARTNOHAND:
938 case -ERESTARTNOINTR:
939 regs->d0 = regs->orig_d0;
947 * OK, we're invoking a handler
950 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
951 sigset_t *oldset, struct pt_regs *regs)
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);
959 /* set up the stack frame */
960 if (ka->sa.sa_flags & SA_SIGINFO)
961 err = setup_rt_frame(sig, ka, info, oldset, regs);
963 err = setup_frame(sig, ka, oldset, regs);
968 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
969 if (!(ka->sa.sa_flags & SA_NODEFER))
970 sigaddset(¤t->blocked,sig);
973 if (test_thread_flag(TIF_DELAYED_TRACE)) {
975 send_sig(SIGTRAP, current, 1);
978 clear_thread_flag(TIF_RESTORE_SIGMASK);
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
986 asmlinkage void do_signal(struct pt_regs *regs)
989 struct k_sigaction ka;
993 current->thread.esp0 = (unsigned long) regs;
995 if (test_thread_flag(TIF_RESTORE_SIGMASK))
996 oldset = ¤t->saved_sigmask;
998 oldset = ¤t->blocked;
1000 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1002 /* Whee! Actually deliver the signal. */
1003 handle_signal(signr, &ka, &info, oldset, regs);
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);
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);