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>
46 #include <asm/setup.h>
47 #include <asm/uaccess.h>
48 #include <asm/pgtable.h>
49 #include <asm/traps.h>
50 #include <asm/ucontext.h>
52 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
54 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
56 const int frame_extra_sizes[16] = {
57 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
58 [2] = sizeof(((struct frame *)0)->un.fmt2),
59 [3] = sizeof(((struct frame *)0)->un.fmt3),
60 [4] = sizeof(((struct frame *)0)->un.fmt4),
61 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
62 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
63 [7] = sizeof(((struct frame *)0)->un.fmt7),
64 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */
65 [9] = sizeof(((struct frame *)0)->un.fmt9),
66 [10] = sizeof(((struct frame *)0)->un.fmta),
67 [11] = sizeof(((struct frame *)0)->un.fmtb),
68 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */
69 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */
70 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */
71 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
75 * Atomically swap in the new signal mask, and wait for a signal.
77 asmlinkage int do_sigsuspend(struct pt_regs *regs)
79 old_sigset_t mask = regs->d3;
83 saveset = current->blocked;
84 siginitset(¤t->blocked, mask);
89 current->state = TASK_INTERRUPTIBLE;
91 if (do_signal(&saveset, regs))
97 do_rt_sigsuspend(struct pt_regs *regs)
99 sigset_t __user *unewset = (sigset_t __user *)regs->d1;
100 size_t sigsetsize = (size_t)regs->d2;
101 sigset_t saveset, newset;
103 /* XXX: Don't preclude handling different sized sigset_t's. */
104 if (sigsetsize != sizeof(sigset_t))
107 if (copy_from_user(&newset, unewset, sizeof(newset)))
109 sigdelsetmask(&newset, ~_BLOCKABLE);
111 saveset = current->blocked;
112 current->blocked = newset;
117 current->state = TASK_INTERRUPTIBLE;
119 if (do_signal(&saveset, regs))
125 sys_sigaction(int sig, const struct old_sigaction __user *act,
126 struct old_sigaction __user *oact)
128 struct k_sigaction new_ka, old_ka;
133 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
134 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
135 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
137 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
138 __get_user(mask, &act->sa_mask);
139 siginitset(&new_ka.sa.sa_mask, mask);
142 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
145 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
146 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
147 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
149 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
150 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
157 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
159 return do_sigaltstack(uss, uoss, rdusp());
164 * Do a signal return; undo the signal stack.
166 * Keep the return code on the stack quadword aligned!
167 * That makes the cache flush below easier.
172 char __user *pretcode;
175 struct sigcontext __user *psc;
177 unsigned long extramask[_NSIG_WORDS-1];
178 struct sigcontext sc;
183 char __user *pretcode;
185 struct siginfo __user *pinfo;
193 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
195 static inline int restore_fpu_state(struct sigcontext *sc)
200 /* restore registers */
201 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
202 memcpy(current->thread.fp, sc->sc_fpregs, 24);
206 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
207 /* Verify the frame format. */
208 if (!CPU_IS_060 && (sc->sc_fpstate[0] != fpu_version))
210 if (CPU_IS_020_OR_030) {
211 if (m68k_fputype & FPU_68881 &&
212 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4))
214 if (m68k_fputype & FPU_68882 &&
215 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4))
217 } else if (CPU_IS_040) {
218 if (!(sc->sc_fpstate[1] == 0x00 ||
219 sc->sc_fpstate[1] == 0x28 ||
220 sc->sc_fpstate[1] == 0x60))
222 } else if (CPU_IS_060) {
223 if (!(sc->sc_fpstate[3] == 0x00 ||
224 sc->sc_fpstate[3] == 0x60 ||
225 sc->sc_fpstate[3] == 0xe0))
230 __asm__ volatile (".chip 68k/68881\n\t"
231 "fmovemx %0,%%fp0-%%fp1\n\t"
232 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
235 : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl));
237 __asm__ volatile (".chip 68k/68881\n\t"
239 ".chip 68k" : : "m" (*sc->sc_fpstate));
246 #define FPCONTEXT_SIZE 216
247 #define uc_fpstate uc_filler[0]
248 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
249 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
251 static inline int rt_restore_fpu_state(struct ucontext __user *uc)
253 unsigned char fpstate[FPCONTEXT_SIZE];
254 int context_size = CPU_IS_060 ? 8 : 0;
259 /* restore fpu control register */
260 if (__copy_from_user(current->thread.fpcntl,
261 uc->uc_mcontext.fpregs.f_fpcntl, 12))
263 /* restore all other fpu register */
264 if (__copy_from_user(current->thread.fp,
265 uc->uc_mcontext.fpregs.f_fpregs, 96))
270 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
272 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
274 context_size = fpstate[1];
275 /* Verify the frame format. */
276 if (!CPU_IS_060 && (fpstate[0] != fpu_version))
278 if (CPU_IS_020_OR_030) {
279 if (m68k_fputype & FPU_68881 &&
280 !(context_size == 0x18 || context_size == 0xb4))
282 if (m68k_fputype & FPU_68882 &&
283 !(context_size == 0x38 || context_size == 0xd4))
285 } else if (CPU_IS_040) {
286 if (!(context_size == 0x00 ||
287 context_size == 0x28 ||
288 context_size == 0x60))
290 } else if (CPU_IS_060) {
291 if (!(fpstate[3] == 0x00 ||
292 fpstate[3] == 0x60 ||
297 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
300 __asm__ volatile (".chip 68k/68881\n\t"
301 "fmovemx %0,%%fp0-%%fp7\n\t"
302 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
305 : "m" (*fpregs.f_fpregs),
306 "m" (*fpregs.f_fpcntl));
309 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
312 __asm__ volatile (".chip 68k/68881\n\t"
314 ".chip 68k" : : "m" (*fpstate));
322 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp,
325 int fsize, formatvec;
326 struct sigcontext context;
329 /* get previous context */
330 if (copy_from_user(&context, usc, sizeof(context)))
333 /* restore passed registers */
334 regs->d1 = context.sc_d1;
335 regs->a0 = context.sc_a0;
336 regs->a1 = context.sc_a1;
337 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
338 regs->pc = context.sc_pc;
339 regs->orig_d0 = -1; /* disable syscall checks */
340 wrusp(context.sc_usp);
341 formatvec = context.sc_formatvec;
342 regs->format = formatvec >> 12;
343 regs->vector = formatvec & 0xfff;
345 err = restore_fpu_state(&context);
347 fsize = frame_extra_sizes[regs->format];
350 * user process trying to return with weird frame format
353 printk("user process returning with weird frame format\n");
358 /* OK. Make room on the supervisor stack for the extra junk,
363 struct switch_stack *sw = (struct switch_stack *)regs - 1;
364 regs->d0 = context.sc_d0;
365 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
367 (" movel %0,%/a0\n\t"
368 " subl %1,%/a0\n\t" /* make room on stack */
369 " movel %/a0,%/sp\n\t" /* set stack pointer */
370 /* move switch_stack and pt_regs */
371 "1: movel %0@+,%/a0@+\n\t"
373 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
376 "2: movesl %4@+,%2\n\t"
377 "3: movel %2,%/a0@+\n\t"
379 " bral ret_from_signal\n"
381 ".section __ex_table,\"a\"\n"
386 : /* no outputs, it doesn't ever return */
387 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
388 "n" (frame_offset), "a" (fp)
392 * If we ever get here an exception occurred while
393 * building the above stack-frame.
398 *pd0 = context.sc_d0;
406 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
407 struct ucontext __user *uc, int *pd0)
410 greg_t __user *gregs = uc->uc_mcontext.gregs;
414 err = __get_user(temp, &uc->uc_mcontext.version);
415 if (temp != MCONTEXT_VERSION)
417 /* restore passed registers */
418 err |= __get_user(regs->d0, &gregs[0]);
419 err |= __get_user(regs->d1, &gregs[1]);
420 err |= __get_user(regs->d2, &gregs[2]);
421 err |= __get_user(regs->d3, &gregs[3]);
422 err |= __get_user(regs->d4, &gregs[4]);
423 err |= __get_user(regs->d5, &gregs[5]);
424 err |= __get_user(sw->d6, &gregs[6]);
425 err |= __get_user(sw->d7, &gregs[7]);
426 err |= __get_user(regs->a0, &gregs[8]);
427 err |= __get_user(regs->a1, &gregs[9]);
428 err |= __get_user(regs->a2, &gregs[10]);
429 err |= __get_user(sw->a3, &gregs[11]);
430 err |= __get_user(sw->a4, &gregs[12]);
431 err |= __get_user(sw->a5, &gregs[13]);
432 err |= __get_user(sw->a6, &gregs[14]);
433 err |= __get_user(usp, &gregs[15]);
435 err |= __get_user(regs->pc, &gregs[16]);
436 err |= __get_user(temp, &gregs[17]);
437 regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
438 regs->orig_d0 = -1; /* disable syscall checks */
439 err |= __get_user(temp, &uc->uc_formatvec);
440 regs->format = temp >> 12;
441 regs->vector = temp & 0xfff;
443 err |= rt_restore_fpu_state(uc);
445 if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
448 fsize = frame_extra_sizes[regs->format];
451 * user process trying to return with weird frame format
454 printk("user process returning with weird frame format\n");
459 /* OK. Make room on the supervisor stack for the extra junk,
464 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
466 (" movel %0,%/a0\n\t"
467 " subl %1,%/a0\n\t" /* make room on stack */
468 " movel %/a0,%/sp\n\t" /* set stack pointer */
469 /* move switch_stack and pt_regs */
470 "1: movel %0@+,%/a0@+\n\t"
472 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
475 "2: movesl %4@+,%2\n\t"
476 "3: movel %2,%/a0@+\n\t"
478 " bral ret_from_signal\n"
480 ".section __ex_table,\"a\"\n"
485 : /* no outputs, it doesn't ever return */
486 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
487 "n" (frame_offset), "a" (&uc->uc_extra)
491 * If we ever get here an exception occurred while
492 * building the above stack-frame.
504 asmlinkage int do_sigreturn(unsigned long __unused)
506 struct switch_stack *sw = (struct switch_stack *) &__unused;
507 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
508 unsigned long usp = rdusp();
509 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
513 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
515 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
517 __copy_from_user(&set.sig[1], &frame->extramask,
518 sizeof(frame->extramask))))
521 sigdelsetmask(&set, ~_BLOCKABLE);
522 current->blocked = set;
525 if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
530 force_sig(SIGSEGV, current);
534 asmlinkage int do_rt_sigreturn(unsigned long __unused)
536 struct switch_stack *sw = (struct switch_stack *) &__unused;
537 struct pt_regs *regs = (struct pt_regs *) (sw + 1);
538 unsigned long usp = rdusp();
539 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
543 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
545 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
548 sigdelsetmask(&set, ~_BLOCKABLE);
549 current->blocked = set;
552 if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
557 force_sig(SIGSEGV, current);
562 * Set up a signal frame.
565 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
569 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
570 memcpy(sc->sc_fpregs, current->thread.fp, 24);
574 __asm__ volatile (".chip 68k/68881\n\t"
577 : : "m" (*sc->sc_fpstate) : "memory");
579 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
580 fpu_version = sc->sc_fpstate[0];
581 if (CPU_IS_020_OR_030 &&
582 regs->vector >= (VEC_FPBRUC * 4) &&
583 regs->vector <= (VEC_FPNAN * 4)) {
584 /* Clear pending exception in 68882 idle frame */
585 if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
586 sc->sc_fpstate[0x38] |= 1 << 3;
588 __asm__ volatile (".chip 68k/68881\n\t"
589 "fmovemx %%fp0-%%fp1,%0\n\t"
590 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
592 : "=m" (*sc->sc_fpregs),
593 "=m" (*sc->sc_fpcntl)
599 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
601 unsigned char fpstate[FPCONTEXT_SIZE];
602 int context_size = CPU_IS_060 ? 8 : 0;
606 /* save fpu control register */
607 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
608 current->thread.fpcntl, 12);
609 /* save all other fpu register */
610 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
611 current->thread.fp, 96);
615 __asm__ volatile (".chip 68k/68881\n\t"
618 : : "m" (*fpstate) : "memory");
620 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
621 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
624 context_size = fpstate[1];
625 fpu_version = fpstate[0];
626 if (CPU_IS_020_OR_030 &&
627 regs->vector >= (VEC_FPBRUC * 4) &&
628 regs->vector <= (VEC_FPNAN * 4)) {
629 /* Clear pending exception in 68882 idle frame */
630 if (*(unsigned short *) fpstate == 0x1f38)
631 fpstate[0x38] |= 1 << 3;
633 __asm__ volatile (".chip 68k/68881\n\t"
634 "fmovemx %%fp0-%%fp7,%0\n\t"
635 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
637 : "=m" (*fpregs.f_fpregs),
638 "=m" (*fpregs.f_fpcntl)
641 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
645 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
650 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
654 sc->sc_usp = rdusp();
655 sc->sc_d0 = regs->d0;
656 sc->sc_d1 = regs->d1;
657 sc->sc_a0 = regs->a0;
658 sc->sc_a1 = regs->a1;
659 sc->sc_sr = regs->sr;
660 sc->sc_pc = regs->pc;
661 sc->sc_formatvec = regs->format << 12 | regs->vector;
662 save_fpu_state(sc, regs);
665 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
667 struct switch_stack *sw = (struct switch_stack *)regs - 1;
668 greg_t __user *gregs = uc->uc_mcontext.gregs;
671 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
672 err |= __put_user(regs->d0, &gregs[0]);
673 err |= __put_user(regs->d1, &gregs[1]);
674 err |= __put_user(regs->d2, &gregs[2]);
675 err |= __put_user(regs->d3, &gregs[3]);
676 err |= __put_user(regs->d4, &gregs[4]);
677 err |= __put_user(regs->d5, &gregs[5]);
678 err |= __put_user(sw->d6, &gregs[6]);
679 err |= __put_user(sw->d7, &gregs[7]);
680 err |= __put_user(regs->a0, &gregs[8]);
681 err |= __put_user(regs->a1, &gregs[9]);
682 err |= __put_user(regs->a2, &gregs[10]);
683 err |= __put_user(sw->a3, &gregs[11]);
684 err |= __put_user(sw->a4, &gregs[12]);
685 err |= __put_user(sw->a5, &gregs[13]);
686 err |= __put_user(sw->a6, &gregs[14]);
687 err |= __put_user(rdusp(), &gregs[15]);
688 err |= __put_user(regs->pc, &gregs[16]);
689 err |= __put_user(regs->sr, &gregs[17]);
690 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
691 err |= rt_save_fpu_state(uc, regs);
695 static inline void push_cache (unsigned long vaddr)
698 * Using the old cache_push_v() was really a big waste.
700 * What we are trying to do is to flush 8 bytes to ram.
701 * Flushing 2 cache lines of 16 bytes is much cheaper than
702 * flushing 1 or 2 pages, as previously done in
709 __asm__ __volatile__ (".chip 68040\n\t"
712 "movec %%mmusr,%0\n\t"
718 temp |= vaddr & ~PAGE_MASK;
720 __asm__ __volatile__ (".chip 68040\n\t"
722 "cpushl %%bc,(%0)\n\t"
726 else if (CPU_IS_060) {
728 __asm__ __volatile__ (".chip 68060\n\t"
733 __asm__ __volatile__ (".chip 68060\n\t"
734 "cpushl %%bc,(%0)\n\t"
740 * 68030/68020 have no writeback cache;
741 * still need to clear icache.
742 * Note that vaddr is guaranteed to be long word aligned.
745 asm volatile ("movec %%cacr,%0" : "=r" (temp));
747 asm volatile ("movec %0,%%caar\n\t"
749 : : "r" (vaddr), "r" (temp));
750 asm volatile ("movec %0,%%caar\n\t"
752 : : "r" (vaddr + 4), "r" (temp));
756 static inline void __user *
757 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
761 /* Default to using normal stack. */
764 /* This is the X/Open sanctioned signal stack switching. */
765 if (ka->sa.sa_flags & SA_ONSTACK) {
766 if (!sas_ss_flags(usp))
767 usp = current->sas_ss_sp + current->sas_ss_size;
769 return (void __user *)((usp - frame_size) & -8UL);
772 static void setup_frame (int sig, struct k_sigaction *ka,
773 sigset_t *set, struct pt_regs *regs)
775 struct sigframe __user *frame;
776 int fsize = frame_extra_sizes[regs->format];
777 struct sigcontext context;
782 printk ("setup_frame: Unknown frame format %#x\n",
788 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize);
791 err |= copy_to_user (frame + 1, regs + 1, fsize);
792 regs->stkadj = fsize;
795 err |= __put_user((current_thread_info()->exec_domain
796 && current_thread_info()->exec_domain->signal_invmap
798 ? current_thread_info()->exec_domain->signal_invmap[sig]
802 err |= __put_user(regs->vector, &frame->code);
803 err |= __put_user(&frame->sc, &frame->psc);
806 err |= copy_to_user(frame->extramask, &set->sig[1],
807 sizeof(frame->extramask));
809 setup_sigcontext(&context, regs, set->sig[0]);
810 err |= copy_to_user (&frame->sc, &context, sizeof(context));
812 /* Set up to return from userspace. */
813 err |= __put_user(frame->retcode, &frame->pretcode);
814 /* moveq #,d0; trap #0 */
815 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
816 (long __user *)(frame->retcode));
821 push_cache ((unsigned long) &frame->retcode);
823 /* Set up registers for signal handler */
824 wrusp ((unsigned long) frame);
825 regs->pc = (unsigned long) ka->sa.sa_handler;
828 /* Prepare to skip over the extra stuff in the exception frame. */
830 struct pt_regs *tregs =
831 (struct pt_regs *)((ulong)regs + regs->stkadj);
833 printk("Performing stackadjust=%04x\n", regs->stkadj);
835 /* This must be copied with decreasing addresses to
839 tregs->pc = regs->pc;
840 tregs->sr = regs->sr;
845 force_sigsegv(sig, current);
849 static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
850 sigset_t *set, struct pt_regs *regs)
852 struct rt_sigframe __user *frame;
853 int fsize = frame_extra_sizes[regs->format];
858 printk ("setup_frame: Unknown frame format %#x\n",
864 frame = get_sigframe(ka, regs, sizeof(*frame));
867 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize);
868 regs->stkadj = fsize;
871 err |= __put_user((current_thread_info()->exec_domain
872 && current_thread_info()->exec_domain->signal_invmap
874 ? current_thread_info()->exec_domain->signal_invmap[sig]
877 err |= __put_user(&frame->info, &frame->pinfo);
878 err |= __put_user(&frame->uc, &frame->puc);
879 err |= copy_siginfo_to_user(&frame->info, info);
881 /* Create the ucontext. */
882 err |= __put_user(0, &frame->uc.uc_flags);
883 err |= __put_user(NULL, &frame->uc.uc_link);
884 err |= __put_user((void __user *)current->sas_ss_sp,
885 &frame->uc.uc_stack.ss_sp);
886 err |= __put_user(sas_ss_flags(rdusp()),
887 &frame->uc.uc_stack.ss_flags);
888 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
889 err |= rt_setup_ucontext(&frame->uc, regs);
890 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
892 /* Set up to return from userspace. */
893 err |= __put_user(frame->retcode, &frame->pretcode);
894 /* moveq #,d0; notb d0; trap #0 */
895 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16),
896 (long __user *)(frame->retcode + 0));
897 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
902 push_cache ((unsigned long) &frame->retcode);
904 /* Set up registers for signal handler */
905 wrusp ((unsigned long) frame);
906 regs->pc = (unsigned long) ka->sa.sa_handler;
909 /* Prepare to skip over the extra stuff in the exception frame. */
911 struct pt_regs *tregs =
912 (struct pt_regs *)((ulong)regs + regs->stkadj);
914 printk("Performing stackadjust=%04x\n", regs->stkadj);
916 /* This must be copied with decreasing addresses to
920 tregs->pc = regs->pc;
921 tregs->sr = regs->sr;
926 force_sigsegv(sig, current);
931 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
934 case -ERESTARTNOHAND:
941 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
946 case -ERESTARTNOINTR:
948 regs->d0 = regs->orig_d0;
954 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
956 if (regs->orig_d0 < 0)
959 case -ERESTARTNOHAND:
961 case -ERESTARTNOINTR:
962 regs->d0 = regs->orig_d0;
970 * OK, we're invoking a handler
973 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
974 sigset_t *oldset, struct pt_regs *regs)
976 /* are we from a system call? */
977 if (regs->orig_d0 >= 0)
978 /* If so, check system call restarting.. */
979 handle_restart(regs, ka, 1);
981 /* set up the stack frame */
982 if (ka->sa.sa_flags & SA_SIGINFO)
983 setup_rt_frame(sig, ka, info, oldset, regs);
985 setup_frame(sig, ka, oldset, regs);
987 if (ka->sa.sa_flags & SA_ONESHOT)
988 ka->sa.sa_handler = SIG_DFL;
990 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
991 if (!(ka->sa.sa_flags & SA_NODEFER))
992 sigaddset(¤t->blocked,sig);
997 * Note that 'init' is a special process: it doesn't get signals it doesn't
998 * want to handle. Thus you cannot kill init even with a SIGKILL even by
1001 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
1004 struct k_sigaction ka;
1007 current->thread.esp0 = (unsigned long) regs;
1010 oldset = ¤t->blocked;
1012 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1014 /* Whee! Actually deliver the signal. */
1015 handle_signal(signr, &ka, &info, oldset, regs);
1019 /* Did we come from a system call? */
1020 if (regs->orig_d0 >= 0)
1021 /* Restart the system call - no handlers present */
1022 handle_restart(regs, NULL, 0);