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>
41 #include <linux/tracehook.h>
43 #include <asm/setup.h>
44 #include <asm/uaccess.h>
45 #include <asm/pgtable.h>
46 #include <asm/traps.h>
47 #include <asm/ucontext.h>
50 * Atomically swap in the new signal mask, and wait for a signal.
53 sys_sigsuspend(int unused1, int unused2, old_sigset_t mask)
56 siginitset(&blocked, mask);
57 return sigsuspend(&blocked);
61 sys_sigaction(int sig, const struct old_sigaction *act,
62 struct old_sigaction *oact)
64 struct k_sigaction new_ka, old_ka;
69 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
70 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
71 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
72 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
73 __get_user(mask, &act->sa_mask))
75 siginitset(&new_ka.sa.sa_mask, mask);
78 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
81 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
82 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
83 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
84 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
85 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
93 sys_sigaltstack(const stack_t *uss, stack_t *uoss)
95 return do_sigaltstack(uss, uoss, rdusp());
100 * Do a signal return; undo the signal stack.
102 * Keep the return code on the stack quadword aligned!
103 * That makes the cache flush below easier.
110 #if defined(CONFIG_CPU_H8S)
115 unsigned char retcode[8];
116 unsigned long extramask[_NSIG_WORDS-1];
117 struct sigcontext sc;
119 } __attribute__((aligned(2),packed));
125 #if defined(CONFIG_CPU_H8S)
130 struct siginfo *pinfo;
132 unsigned char retcode[8];
136 } __attribute__((aligned(2),packed));
139 restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc,
147 /* Always make any pending restarted system calls return -EINTR */
148 current_thread_info()->restart_block.fn = do_no_restart_syscall;
150 #define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
156 ccr = regs->ccr & 0x10;
161 regs->orig_er0 = -1; /* disable syscall checks */
162 err |= __get_user(usp, &usc->sc_usp);
165 err |= __get_user(er0, &usc->sc_er0);
170 asmlinkage int do_sigreturn(unsigned long __unused,...)
172 struct pt_regs *regs = (struct pt_regs *) (&__unused - 1);
173 unsigned long usp = rdusp();
174 struct sigframe *frame = (struct sigframe *)(usp - 4);
178 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
180 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
182 __copy_from_user(&set.sig[1], &frame->extramask,
183 sizeof(frame->extramask))))
186 set_current_blocked(&set);
188 if (restore_sigcontext(regs, &frame->sc, &er0))
193 force_sig(SIGSEGV, current);
197 asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
199 struct pt_regs *regs = (struct pt_regs *) &__unused;
200 unsigned long usp = rdusp();
201 struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
205 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
207 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
210 set_current_blocked(&set);
212 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
215 if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
221 force_sig(SIGSEGV, current);
225 static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
230 err |= __put_user(regs->er0, &sc->sc_er0);
231 err |= __put_user(regs->er1, &sc->sc_er1);
232 err |= __put_user(regs->er2, &sc->sc_er2);
233 err |= __put_user(regs->er3, &sc->sc_er3);
234 err |= __put_user(regs->er4, &sc->sc_er4);
235 err |= __put_user(regs->er5, &sc->sc_er5);
236 err |= __put_user(regs->er6, &sc->sc_er6);
237 err |= __put_user(rdusp(), &sc->sc_usp);
238 err |= __put_user(regs->pc, &sc->sc_pc);
239 err |= __put_user(regs->ccr, &sc->sc_ccr);
240 err |= __put_user(mask, &sc->sc_mask);
246 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
250 /* Default to using normal stack. */
253 /* This is the X/Open sanctioned signal stack switching. */
254 if (ka->sa.sa_flags & SA_ONSTACK) {
255 if (!sas_ss_flags(usp))
256 usp = current->sas_ss_sp + current->sas_ss_size;
258 return (void *)((usp - frame_size) & -8UL);
261 static int setup_frame (int sig, struct k_sigaction *ka,
262 sigset_t *set, struct pt_regs *regs)
264 struct sigframe *frame;
269 frame = get_sigframe(ka, regs, sizeof(*frame));
271 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
274 usig = current_thread_info()->exec_domain
275 && current_thread_info()->exec_domain->signal_invmap
277 ? current_thread_info()->exec_domain->signal_invmap[sig]
280 err |= __put_user(usig, &frame->sig);
284 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
288 if (_NSIG_WORDS > 1) {
289 err |= copy_to_user(frame->extramask, &set->sig[1],
290 sizeof(frame->extramask));
295 ret = frame->retcode;
296 if (ka->sa.sa_flags & SA_RESTORER)
297 ret = (unsigned char *)(ka->sa.sa_restorer);
299 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
300 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
301 (unsigned long *)(frame->retcode + 0));
302 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
305 /* Set up to return from userspace. */
306 err |= __put_user(ret, &frame->pretcode);
311 /* Set up registers for signal handler */
312 wrusp ((unsigned long) frame);
313 regs->pc = (unsigned long) ka->sa.sa_handler;
314 regs->er0 = (current_thread_info()->exec_domain
315 && current_thread_info()->exec_domain->signal_invmap
317 ? current_thread_info()->exec_domain->signal_invmap[sig]
319 regs->er1 = (unsigned long)&(frame->sc);
320 regs->er5 = current->mm->start_data; /* GOT base */
325 force_sigsegv(sig, current);
329 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
330 sigset_t *set, struct pt_regs *regs)
332 struct rt_sigframe *frame;
337 frame = get_sigframe(ka, regs, sizeof(*frame));
339 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
342 usig = current_thread_info()->exec_domain
343 && current_thread_info()->exec_domain->signal_invmap
345 ? current_thread_info()->exec_domain->signal_invmap[sig]
348 err |= __put_user(usig, &frame->sig);
352 err |= __put_user(&frame->info, &frame->pinfo);
353 err |= __put_user(&frame->uc, &frame->puc);
354 err |= copy_siginfo_to_user(&frame->info, info);
358 /* Create the ucontext. */
359 err |= __put_user(0, &frame->uc.uc_flags);
360 err |= __put_user(0, &frame->uc.uc_link);
361 err |= __put_user((void *)current->sas_ss_sp,
362 &frame->uc.uc_stack.ss_sp);
363 err |= __put_user(sas_ss_flags(rdusp()),
364 &frame->uc.uc_stack.ss_flags);
365 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
366 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
367 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
371 /* Set up to return from userspace. */
372 ret = frame->retcode;
373 if (ka->sa.sa_flags & SA_RESTORER)
374 ret = (unsigned char *)(ka->sa.sa_restorer);
376 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
377 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
378 (unsigned long *)(frame->retcode + 0));
379 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
381 err |= __put_user(ret, &frame->pretcode);
386 /* Set up registers for signal handler */
387 wrusp ((unsigned long) frame);
388 regs->pc = (unsigned long) ka->sa.sa_handler;
389 regs->er0 = (current_thread_info()->exec_domain
390 && current_thread_info()->exec_domain->signal_invmap
392 ? current_thread_info()->exec_domain->signal_invmap[sig]
394 regs->er1 = (unsigned long)&(frame->info);
395 regs->er2 = (unsigned long)&frame->uc;
396 regs->er5 = current->mm->start_data; /* GOT base */
401 force_sigsegv(sig, current);
406 * OK, we're invoking a handler
409 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
410 struct pt_regs * regs)
412 sigset_t *oldset = sigmask_to_save();
414 /* are we from a system call? */
415 if (regs->orig_er0 >= 0) {
417 case -ERESTART_RESTARTBLOCK:
418 case -ERESTARTNOHAND:
423 if (!(ka->sa.sa_flags & SA_RESTART)) {
428 case -ERESTARTNOINTR:
429 regs->er0 = regs->orig_er0;
434 /* set up the stack frame */
435 if (ka->sa.sa_flags & SA_SIGINFO)
436 ret = setup_rt_frame(sig, ka, info, oldset, regs);
438 ret = setup_frame(sig, ka, oldset, regs);
441 signal_delivered(sig, info, ka, regs, 0);
445 * Note that 'init' is a special process: it doesn't get signals it doesn't
446 * want to handle. Thus you cannot kill init even with a SIGKILL even by
449 static void do_signal(struct pt_regs *regs)
453 struct k_sigaction ka;
456 * We want the common case to go fast, which
457 * is why we may in certain cases get here from
458 * kernel mode. Just return without doing anything
461 if ((regs->ccr & 0x10))
464 current->thread.esp0 = (unsigned long) regs;
466 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
468 /* Whee! Actually deliver the signal. */
469 handle_signal(signr, &info, &ka, regs);
472 /* Did we come from a system call? */
473 if (regs->orig_er0 >= 0) {
474 /* Restart the system call - no handlers present */
475 if (regs->er0 == -ERESTARTNOHAND ||
476 regs->er0 == -ERESTARTSYS ||
477 regs->er0 == -ERESTARTNOINTR) {
478 regs->er0 = regs->orig_er0;
481 if (regs->er0 == -ERESTART_RESTARTBLOCK){
482 regs->er0 = __NR_restart_syscall;
487 /* If there's no signal to deliver, we just restore the saved mask. */
488 restore_saved_sigmask();
491 asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
493 if (thread_info_flags & _TIF_SIGPENDING)
496 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
497 clear_thread_flag(TIF_NOTIFY_RESUME);
498 tracehook_notify_resume(regs);