2 * linux/arch/h8300/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 * uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
13 * and David McCullough <davidm@snapgear.com>
16 * Linux/m68k by Hamish Macdonald
20 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
21 * Atari :-) Current limitation: Only one sigstack can be active at one time.
22 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
23 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
27 #include <linux/sched.h>
29 #include <linux/kernel.h>
30 #include <linux/signal.h>
31 #include <linux/syscalls.h>
32 #include <linux/errno.h>
33 #include <linux/wait.h>
34 #include <linux/ptrace.h>
35 #include <linux/unistd.h>
36 #include <linux/stddef.h>
37 #include <linux/highuid.h>
38 #include <linux/personality.h>
39 #include <linux/tty.h>
40 #include <linux/binfmts.h>
42 #include <asm/setup.h>
43 #include <asm/uaccess.h>
44 #include <asm/pgtable.h>
45 #include <asm/traps.h>
46 #include <asm/ucontext.h>
48 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
50 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
53 * Atomically swap in the new signal mask, and wait for a signal.
55 asmlinkage int do_sigsuspend(struct pt_regs *regs)
57 old_sigset_t mask = regs->er3;
61 spin_lock_irq(¤t->sighand->siglock);
62 saveset = current->blocked;
63 siginitset(¤t->blocked, mask);
65 spin_unlock_irq(¤t->sighand->siglock);
69 current->state = TASK_INTERRUPTIBLE;
71 if (do_signal(&saveset, regs))
77 do_rt_sigsuspend(struct pt_regs *regs)
79 sigset_t *unewset = (sigset_t *)regs->er1;
80 size_t sigsetsize = (size_t)regs->er2;
81 sigset_t saveset, newset;
83 /* XXX: Don't preclude handling different sized sigset_t's. */
84 if (sigsetsize != sizeof(sigset_t))
87 if (copy_from_user(&newset, unewset, sizeof(newset)))
89 sigdelsetmask(&newset, ~_BLOCKABLE);
91 spin_lock_irq(¤t->sighand->siglock);
92 saveset = current->blocked;
93 current->blocked = newset;
95 spin_unlock_irq(¤t->sighand->siglock);
99 current->state = TASK_INTERRUPTIBLE;
101 if (do_signal(&saveset, regs))
107 sys_sigaction(int sig, const struct old_sigaction *act,
108 struct old_sigaction *oact)
110 struct k_sigaction new_ka, old_ka;
115 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
116 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
117 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
119 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
120 __get_user(mask, &act->sa_mask);
121 siginitset(&new_ka.sa.sa_mask, mask);
124 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
127 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
128 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
129 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
131 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
132 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
139 sys_sigaltstack(const stack_t *uss, stack_t *uoss)
141 return do_sigaltstack(uss, uoss, rdusp());
146 * Do a signal return; undo the signal stack.
148 * Keep the return code on the stack quadword aligned!
149 * That makes the cache flush below easier.
156 #if defined(CONFIG_CPU_H8S)
161 unsigned char retcode[8];
162 unsigned long extramask[_NSIG_WORDS-1];
163 struct sigcontext sc;
164 } __attribute__((aligned(2),packed));
170 #if defined(CONFIG_CPU_H8S)
175 unsigned char retcode[8];
178 } __attribute__((aligned(2),packed));
181 restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, void *fp,
184 struct sigcontext context;
187 /* get previous context */
188 if (copy_from_user(&context, usc, sizeof(context)))
191 /* restore passed registers */
192 regs->er1 = context.sc_er1;
193 regs->er2 = context.sc_er2;
194 regs->er3 = context.sc_er3;
195 regs->er5 = context.sc_er5;
196 regs->ccr = (regs->ccr & 0x10)|(context.sc_ccr & 0xef);
197 regs->pc = context.sc_pc;
198 regs->orig_er0 = -1; /* disable syscall checks */
199 wrusp(context.sc_usp);
201 *pd0 = context.sc_er0;
209 rt_restore_ucontext(struct pt_regs *regs, struct ucontext *uc, int *pd0)
212 greg_t *gregs = uc->uc_mcontext.gregs;
216 err = __get_user(temp, &uc->uc_mcontext.version);
217 if (temp != MCONTEXT_VERSION)
219 /* restore passed registers */
220 err |= __get_user(regs->er0, &gregs[0]);
221 err |= __get_user(regs->er1, &gregs[1]);
222 err |= __get_user(regs->er2, &gregs[2]);
223 err |= __get_user(regs->er3, &gregs[3]);
224 err |= __get_user(regs->er4, &gregs[4]);
225 err |= __get_user(regs->er5, &gregs[5]);
226 err |= __get_user(regs->er6, &gregs[6]);
227 err |= __get_user(usp, &gregs[7]);
229 err |= __get_user(regs->pc, &gregs[8]);
230 err |= __get_user(temp, &gregs[9]);
231 regs->ccr = (regs->ccr & 0x10) | (temp & 0xef);
232 regs->orig_er0 = -1; /* disable syscall checks */
234 if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
244 asmlinkage int do_sigreturn(unsigned long __unused,...)
246 struct pt_regs *regs = (struct pt_regs *) (&__unused - 1);
247 unsigned long usp = rdusp();
248 struct sigframe *frame = (struct sigframe *)(usp - 4);
252 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
254 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
256 __copy_from_user(&set.sig[1], &frame->extramask,
257 sizeof(frame->extramask))))
260 sigdelsetmask(&set, ~_BLOCKABLE);
261 spin_lock_irq(¤t->sighand->siglock);
262 current->blocked = set;
264 spin_unlock_irq(¤t->sighand->siglock);
266 if (restore_sigcontext(regs, &frame->sc, frame + 1, &er0))
271 force_sig(SIGSEGV, current);
275 asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
277 struct pt_regs *regs = (struct pt_regs *) &__unused;
278 unsigned long usp = rdusp();
279 struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
283 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
285 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
288 sigdelsetmask(&set, ~_BLOCKABLE);
289 spin_unlock_irq(¤t->sighand->siglock);
290 current->blocked = set;
292 spin_lock_irq(¤t->sighand->siglock);
294 if (rt_restore_ucontext(regs, &frame->uc, &er0))
299 force_sig(SIGSEGV, current);
303 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
307 sc->sc_usp = rdusp();
308 sc->sc_er0 = regs->er0;
309 sc->sc_er1 = regs->er1;
310 sc->sc_er2 = regs->er2;
311 sc->sc_er3 = regs->er3;
312 sc->sc_er5 = regs->er5;
313 sc->sc_ccr = regs->ccr;
314 sc->sc_pc = regs->pc;
317 static inline int rt_setup_ucontext(struct ucontext *uc, struct pt_regs *regs)
319 greg_t *gregs = uc->uc_mcontext.gregs;
322 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
323 err |= __put_user(regs->er0, &gregs[0]);
324 err |= __put_user(regs->er1, &gregs[1]);
325 err |= __put_user(regs->er2, &gregs[2]);
326 err |= __put_user(regs->er3, &gregs[3]);
327 err |= __put_user(regs->er4, &gregs[4]);
328 err |= __put_user(regs->er5, &gregs[5]);
329 err |= __put_user(regs->er6, &gregs[6]);
330 err |= __put_user(rdusp(), &gregs[7]);
331 err |= __put_user(regs->pc, &gregs[8]);
332 err |= __put_user(regs->ccr, &gregs[9]);
337 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
341 /* Default to using normal stack. */
344 /* This is the X/Open sanctioned signal stack switching. */
345 if (ka->sa.sa_flags & SA_ONSTACK) {
346 if (!on_sig_stack(usp))
347 usp = current->sas_ss_sp + current->sas_ss_size;
349 return (void *)((usp - frame_size) & -8UL);
352 static void setup_frame (int sig, struct k_sigaction *ka,
353 sigset_t *set, struct pt_regs *regs)
355 struct sigframe *frame;
356 struct sigcontext context;
359 frame = get_sigframe(ka, regs, sizeof(*frame));
362 err |= copy_to_user(frame->extramask, &set->sig[1],
363 sizeof(frame->extramask));
365 setup_sigcontext(&context, regs, set->sig[0]);
366 err |= copy_to_user (&frame->sc, &context, sizeof(context));
368 /* Set up to return from userspace. */
369 err |= __put_user(frame->retcode, &frame->pretcode);
371 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
372 err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
373 (unsigned long *)(frame->retcode + 0));
374 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
380 /* Set up registers for signal handler */
381 wrusp ((unsigned long) frame);
382 regs->pc = (unsigned long) ka->sa.sa_handler;
383 regs->er0 = (current_thread_info()->exec_domain
384 && current_thread_info()->exec_domain->signal_invmap
386 ? current_thread_info()->exec_domain->signal_invmap[sig]
388 regs->er1 = (unsigned long)&(frame->sc);
389 regs->er5 = current->mm->start_data; /* GOT base */
395 ka->sa.sa_handler = SIG_DFL;
396 force_sig(SIGSEGV, current);
399 static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
400 sigset_t *set, struct pt_regs *regs)
402 struct rt_sigframe *frame;
405 frame = get_sigframe(ka, regs, sizeof(*frame));
407 err |= copy_siginfo_to_user(&frame->info, info);
409 /* Create the ucontext. */
410 err |= __put_user(0, &frame->uc.uc_flags);
411 err |= __put_user(0, &frame->uc.uc_link);
412 err |= __put_user((void *)current->sas_ss_sp,
413 &frame->uc.uc_stack.ss_sp);
414 err |= __put_user(sas_ss_flags(rdusp()),
415 &frame->uc.uc_stack.ss_flags);
416 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
417 err |= rt_setup_ucontext(&frame->uc, regs);
418 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
420 /* Set up to return from userspace. */
421 err |= __put_user(frame->retcode, &frame->pretcode);
423 /* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */
424 err != __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff),
425 (long *)(frame->retcode + 0));
426 err |= __put_user(0x5700, (short *)(frame->retcode + 4));
431 /* Set up registers for signal handler */
432 wrusp ((unsigned long) frame);
433 regs->pc = (unsigned long) ka->sa.sa_handler;
434 regs->er0 = (current_thread_info()->exec_domain
435 && current_thread_info()->exec_domain->signal_invmap
437 ? current_thread_info()->exec_domain->signal_invmap[sig]
439 regs->er1 = (unsigned long)&(frame->info);
440 regs->er2 = (unsigned long)&frame->uc;
441 regs->er5 = current->mm->start_data; /* GOT base */
447 ka->sa.sa_handler = SIG_DFL;
448 force_sig(SIGSEGV, current);
452 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
455 case -ERESTARTNOHAND:
462 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
467 case -ERESTARTNOINTR:
469 regs->er0 = regs->orig_er0;
476 * OK, we're invoking a handler
479 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
480 sigset_t *oldset, struct pt_regs *regs)
482 /* are we from a system call? */
483 if (regs->orig_er0 >= 0)
484 /* If so, check system call restarting.. */
485 handle_restart(regs, ka, 1);
487 /* set up the stack frame */
488 if (ka->sa.sa_flags & SA_SIGINFO)
489 setup_rt_frame(sig, ka, info, oldset, regs);
491 setup_frame(sig, ka, oldset, regs);
493 if (ka->sa.sa_flags & SA_ONESHOT)
494 ka->sa.sa_handler = SIG_DFL;
496 if (!(ka->sa.sa_flags & SA_NODEFER)) {
497 spin_lock_irq(¤t->sighand->siglock);
498 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
499 sigaddset(¤t->blocked,sig);
501 spin_unlock_irq(¤t->sighand->siglock);
506 * Note that 'init' is a special process: it doesn't get signals it doesn't
507 * want to handle. Thus you cannot kill init even with a SIGKILL even by
510 * Note that we go through the signals twice: once to check the signals
511 * that the kernel can handle, and then we build all the user-level signal
512 * handling stack-frames in one go after that.
514 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
517 struct k_sigaction *ka;
519 current->thread.esp0 = (unsigned long) regs;
522 oldset = ¤t->blocked;
527 signr = get_signal_to_deliver(&info, regs, NULL);
532 if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
533 current->exit_code = signr;
534 current->state = TASK_STOPPED;
536 /* Did we come from a system call? */
537 if (regs->orig_er0 >= 0) {
538 /* Restart the system call the same way as
539 if the process were not traced. */
540 struct k_sigaction *ka =
541 ¤t->sighand->action[signr-1];
543 (ka->sa.sa_handler != SIG_IGN &&
544 ka->sa.sa_handler != SIG_DFL);
545 handle_restart(regs, ka, has_handler);
547 notify_parent(current, SIGCHLD);
550 /* We're back. Did the debugger cancel the sig? */
551 if (!(signr = current->exit_code)) {
555 current->exit_code = 0;
557 /* The debugger continued. Ignore SIGSTOP. */
558 if (signr == SIGSTOP)
561 /* Update the siginfo structure. Is this good? */
562 if (signr != info.si_signo) {
563 info.si_signo = signr;
565 info.si_code = SI_USER;
566 info.si_pid = current->parent->pid;
567 info.si_uid = current->parent->uid;
570 /* If the (new) signal is now blocked, requeue it. */
571 if (sigismember(¤t->blocked, signr)) {
572 send_sig_info(signr, &info, current);
577 ka = ¤t->sighand->action[signr-1];
578 if (ka->sa.sa_handler == SIG_IGN) {
579 if (signr != SIGCHLD)
581 /* Check for SIGCHLD: it's special. */
582 while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
587 if (ka->sa.sa_handler == SIG_DFL) {
588 int exit_code = signr;
590 if (current->pid == 1)
594 case SIGCONT: case SIGCHLD:
595 case SIGWINCH: case SIGURG:
598 case SIGTSTP: case SIGTTIN: case SIGTTOU:
599 if (is_orphaned_pgrp(process_group(current)))
604 struct sighand_struct *sig;
605 current->state = TASK_STOPPED;
606 current->exit_code = signr;
607 sig = current->parent->sighand;
608 if (sig && !(sig->action[SIGCHLD-1].sa.sa_flags
610 notify_parent(current, SIGCHLD);
615 case SIGQUIT: case SIGILL: case SIGTRAP:
616 case SIGIOT: case SIGFPE: case SIGSEGV:
617 case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
618 if (do_coredump(signr, exit_code, regs))
623 sigaddset(¤t->pending.signal, signr);
625 current->flags |= PF_SIGNALED;
631 /* Whee! Actually deliver the signal. */
632 handle_signal(signr, ka, &info, oldset, regs);
636 /* Did we come from a system call? */
637 if (regs->orig_er0 >= 0)
638 /* Restart the system call - no handlers present */
639 handle_restart(regs, NULL, 0);