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/freezer.h>
42 #include <linux/tracehook.h>
44 #include <asm/setup.h>
45 #include <asm/uaccess.h>
46 #include <asm/pgtable.h>
47 #include <asm/traps.h>
48 #include <asm/ucontext.h>
51 * Atomically swap in the new signal mask, and wait for a signal.
54 sys_sigsuspend(int unused1, int unused2, old_sigset_t mask)
57 siginitset(&blocked, mask);
58 return sigsuspend(&blocked);
62 sys_sigaction(int sig, const struct old_sigaction *act,
63 struct old_sigaction *oact)
65 struct k_sigaction new_ka, old_ka;
70 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
71 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
72 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
73 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
74 __get_user(mask, &act->sa_mask))
76 siginitset(&new_ka.sa.sa_mask, mask);
79 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
82 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
83 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
84 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
85 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
86 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
94 sys_sigaltstack(const stack_t *uss, stack_t *uoss)
96 return do_sigaltstack(uss, uoss, rdusp());
101 * Do a signal return; undo the signal stack.
103 * Keep the return code on the stack quadword aligned!
104 * That makes the cache flush below easier.
111 #if defined(CONFIG_CPU_H8S)
116 unsigned char retcode[8];
117 unsigned long extramask[_NSIG_WORDS-1];
118 struct sigcontext sc;
120 } __attribute__((aligned(2),packed));
126 #if defined(CONFIG_CPU_H8S)
131 struct siginfo *pinfo;
133 unsigned char retcode[8];
137 } __attribute__((aligned(2),packed));
140 restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc,
148 /* Always make any pending restarted system calls return -EINTR */
149 current_thread_info()->restart_block.fn = do_no_restart_syscall;
151 #define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
157 ccr = regs->ccr & 0x10;
162 regs->orig_er0 = -1; /* disable syscall checks */
163 err |= __get_user(usp, &usc->sc_usp);
166 err |= __get_user(er0, &usc->sc_er0);
171 asmlinkage int do_sigreturn(unsigned long __unused,...)
173 struct pt_regs *regs = (struct pt_regs *) (&__unused - 1);
174 unsigned long usp = rdusp();
175 struct sigframe *frame = (struct sigframe *)(usp - 4);
179 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
181 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
183 __copy_from_user(&set.sig[1], &frame->extramask,
184 sizeof(frame->extramask))))
187 set_current_blocked(&set);
189 if (restore_sigcontext(regs, &frame->sc, &er0))
194 force_sig(SIGSEGV, current);
198 asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
200 struct pt_regs *regs = (struct pt_regs *) &__unused;
201 unsigned long usp = rdusp();
202 struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
206 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
208 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
211 set_current_blocked(&set);
213 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
216 if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
222 force_sig(SIGSEGV, current);
226 static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
231 err |= __put_user(regs->er0, &sc->sc_er0);
232 err |= __put_user(regs->er1, &sc->sc_er1);
233 err |= __put_user(regs->er2, &sc->sc_er2);
234 err |= __put_user(regs->er3, &sc->sc_er3);
235 err |= __put_user(regs->er4, &sc->sc_er4);
236 err |= __put_user(regs->er5, &sc->sc_er5);
237 err |= __put_user(regs->er6, &sc->sc_er6);
238 err |= __put_user(rdusp(), &sc->sc_usp);
239 err |= __put_user(regs->pc, &sc->sc_pc);
240 err |= __put_user(regs->ccr, &sc->sc_ccr);
241 err |= __put_user(mask, &sc->sc_mask);
247 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
251 /* Default to using normal stack. */
254 /* This is the X/Open sanctioned signal stack switching. */
255 if (ka->sa.sa_flags & SA_ONSTACK) {
256 if (!sas_ss_flags(usp))
257 usp = current->sas_ss_sp + current->sas_ss_size;
259 return (void *)((usp - frame_size) & -8UL);
262 static int setup_frame (int sig, struct k_sigaction *ka,
263 sigset_t *set, struct pt_regs *regs)
265 struct sigframe *frame;
270 frame = get_sigframe(ka, regs, sizeof(*frame));
272 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
275 usig = current_thread_info()->exec_domain
276 && current_thread_info()->exec_domain->signal_invmap
278 ? current_thread_info()->exec_domain->signal_invmap[sig]
281 err |= __put_user(usig, &frame->sig);
285 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
289 if (_NSIG_WORDS > 1) {
290 err |= copy_to_user(frame->extramask, &set->sig[1],
291 sizeof(frame->extramask));
296 ret = frame->retcode;
297 if (ka->sa.sa_flags & SA_RESTORER)
298 ret = (unsigned char *)(ka->sa.sa_restorer);
300 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
301 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
302 (unsigned long *)(frame->retcode + 0));
303 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
306 /* Set up to return from userspace. */
307 err |= __put_user(ret, &frame->pretcode);
312 /* Set up registers for signal handler */
313 wrusp ((unsigned long) frame);
314 regs->pc = (unsigned long) ka->sa.sa_handler;
315 regs->er0 = (current_thread_info()->exec_domain
316 && current_thread_info()->exec_domain->signal_invmap
318 ? current_thread_info()->exec_domain->signal_invmap[sig]
320 regs->er1 = (unsigned long)&(frame->sc);
321 regs->er5 = current->mm->start_data; /* GOT base */
326 force_sigsegv(sig, current);
330 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
331 sigset_t *set, struct pt_regs *regs)
333 struct rt_sigframe *frame;
338 frame = get_sigframe(ka, regs, sizeof(*frame));
340 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
343 usig = current_thread_info()->exec_domain
344 && current_thread_info()->exec_domain->signal_invmap
346 ? current_thread_info()->exec_domain->signal_invmap[sig]
349 err |= __put_user(usig, &frame->sig);
353 err |= __put_user(&frame->info, &frame->pinfo);
354 err |= __put_user(&frame->uc, &frame->puc);
355 err |= copy_siginfo_to_user(&frame->info, info);
359 /* Create the ucontext. */
360 err |= __put_user(0, &frame->uc.uc_flags);
361 err |= __put_user(0, &frame->uc.uc_link);
362 err |= __put_user((void *)current->sas_ss_sp,
363 &frame->uc.uc_stack.ss_sp);
364 err |= __put_user(sas_ss_flags(rdusp()),
365 &frame->uc.uc_stack.ss_flags);
366 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
367 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
368 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
372 /* Set up to return from userspace. */
373 ret = frame->retcode;
374 if (ka->sa.sa_flags & SA_RESTORER)
375 ret = (unsigned char *)(ka->sa.sa_restorer);
377 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
378 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
379 (unsigned long *)(frame->retcode + 0));
380 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
382 err |= __put_user(ret, &frame->pretcode);
387 /* Set up registers for signal handler */
388 wrusp ((unsigned long) frame);
389 regs->pc = (unsigned long) ka->sa.sa_handler;
390 regs->er0 = (current_thread_info()->exec_domain
391 && current_thread_info()->exec_domain->signal_invmap
393 ? current_thread_info()->exec_domain->signal_invmap[sig]
395 regs->er1 = (unsigned long)&(frame->info);
396 regs->er2 = (unsigned long)&frame->uc;
397 regs->er5 = current->mm->start_data; /* GOT base */
402 force_sigsegv(sig, current);
407 * OK, we're invoking a handler
410 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
411 struct pt_regs * regs)
413 sigset_t *oldset = sigmask_to_save();
415 /* are we from a system call? */
416 if (regs->orig_er0 >= 0) {
418 case -ERESTART_RESTARTBLOCK:
419 case -ERESTARTNOHAND:
424 if (!(ka->sa.sa_flags & SA_RESTART)) {
429 case -ERESTARTNOINTR:
430 regs->er0 = regs->orig_er0;
435 /* set up the stack frame */
436 if (ka->sa.sa_flags & SA_SIGINFO)
437 ret = setup_rt_frame(sig, ka, info, oldset, regs);
439 ret = setup_frame(sig, ka, oldset, regs);
442 signal_delivered(sig, info, ka, regs, 0);
446 * Note that 'init' is a special process: it doesn't get signals it doesn't
447 * want to handle. Thus you cannot kill init even with a SIGKILL even by
450 statis void do_signal(struct pt_regs *regs)
454 struct k_sigaction ka;
457 * We want the common case to go fast, which
458 * is why we may in certain cases get here from
459 * kernel mode. Just return without doing anything
462 if ((regs->ccr & 0x10))
465 current->thread.esp0 = (unsigned long) regs;
467 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
469 /* Whee! Actually deliver the signal. */
470 handle_signal(signr, &info, &ka, regs);
473 /* Did we come from a system call? */
474 if (regs->orig_er0 >= 0) {
475 /* Restart the system call - no handlers present */
476 if (regs->er0 == -ERESTARTNOHAND ||
477 regs->er0 == -ERESTARTSYS ||
478 regs->er0 == -ERESTARTNOINTR) {
479 regs->er0 = regs->orig_er0;
482 if (regs->er0 == -ERESTART_RESTARTBLOCK){
483 regs->er0 = __NR_restart_syscall;
488 /* If there's no signal to deliver, we just restore the saved mask. */
489 restore_saved_sigmask();
492 asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
494 if (thread_info_flags & _TIF_SIGPENDING)
497 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
498 clear_thread_flag(TIF_NOTIFY_RESUME);
499 tracehook_notify_resume(regs);