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 * Do a signal return; undo the signal stack.
52 * Keep the return code on the stack quadword aligned!
53 * That makes the cache flush below easier.
60 #if defined(CONFIG_CPU_H8S)
65 unsigned char retcode[8];
66 unsigned long extramask[_NSIG_WORDS-1];
69 } __attribute__((aligned(2),packed));
75 #if defined(CONFIG_CPU_H8S)
80 struct siginfo *pinfo;
82 unsigned char retcode[8];
86 } __attribute__((aligned(2),packed));
89 restore_sigcontext(struct sigcontext *usc, int *pd0)
91 struct pt_regs *regs = current_pt_regs();
97 /* Always make any pending restarted system calls return -EINTR */
98 current_thread_info()->restart_block.fn = do_no_restart_syscall;
100 #define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
106 ccr = regs->ccr & 0x10;
111 regs->orig_er0 = -1; /* disable syscall checks */
112 err |= __get_user(usp, &usc->sc_usp);
115 err |= __get_user(er0, &usc->sc_er0);
120 asmlinkage int sys_sigreturn(void)
122 unsigned long usp = rdusp();
123 struct sigframe *frame = (struct sigframe *)(usp - 4);
127 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
129 if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
131 __copy_from_user(&set.sig[1], &frame->extramask,
132 sizeof(frame->extramask))))
135 set_current_blocked(&set);
137 if (restore_sigcontext(&frame->sc, &er0))
142 force_sig(SIGSEGV, current);
146 asmlinkage int sys_rt_sigreturn(void)
148 unsigned long usp = rdusp();
149 struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
153 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
155 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
158 set_current_blocked(&set);
160 if (restore_sigcontext(&frame->uc.uc_mcontext, &er0))
163 if (restore_altstack(&frame->uc.uc_stack))
169 force_sig(SIGSEGV, current);
173 static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
178 err |= __put_user(regs->er0, &sc->sc_er0);
179 err |= __put_user(regs->er1, &sc->sc_er1);
180 err |= __put_user(regs->er2, &sc->sc_er2);
181 err |= __put_user(regs->er3, &sc->sc_er3);
182 err |= __put_user(regs->er4, &sc->sc_er4);
183 err |= __put_user(regs->er5, &sc->sc_er5);
184 err |= __put_user(regs->er6, &sc->sc_er6);
185 err |= __put_user(rdusp(), &sc->sc_usp);
186 err |= __put_user(regs->pc, &sc->sc_pc);
187 err |= __put_user(regs->ccr, &sc->sc_ccr);
188 err |= __put_user(mask, &sc->sc_mask);
194 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
198 /* Default to using normal stack. */
201 /* This is the X/Open sanctioned signal stack switching. */
202 if (ka->sa.sa_flags & SA_ONSTACK) {
203 if (!sas_ss_flags(usp))
204 usp = current->sas_ss_sp + current->sas_ss_size;
206 return (void *)((usp - frame_size) & -8UL);
209 static int setup_frame (int sig, struct k_sigaction *ka,
210 sigset_t *set, struct pt_regs *regs)
212 struct sigframe *frame;
217 frame = get_sigframe(ka, regs, sizeof(*frame));
219 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
222 usig = current_thread_info()->exec_domain
223 && current_thread_info()->exec_domain->signal_invmap
225 ? current_thread_info()->exec_domain->signal_invmap[sig]
228 err |= __put_user(usig, &frame->sig);
232 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
236 if (_NSIG_WORDS > 1) {
237 err |= copy_to_user(frame->extramask, &set->sig[1],
238 sizeof(frame->extramask));
243 ret = frame->retcode;
244 if (ka->sa.sa_flags & SA_RESTORER)
245 ret = (unsigned char *)(ka->sa.sa_restorer);
247 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
248 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
249 (unsigned long *)(frame->retcode + 0));
250 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
253 /* Set up to return from userspace. */
254 err |= __put_user(ret, &frame->pretcode);
259 /* Set up registers for signal handler */
260 wrusp ((unsigned long) frame);
261 regs->pc = (unsigned long) ka->sa.sa_handler;
262 regs->er0 = (current_thread_info()->exec_domain
263 && current_thread_info()->exec_domain->signal_invmap
265 ? current_thread_info()->exec_domain->signal_invmap[sig]
267 regs->er1 = (unsigned long)&(frame->sc);
268 regs->er5 = current->mm->start_data; /* GOT base */
273 force_sigsegv(sig, current);
277 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
278 sigset_t *set, struct pt_regs *regs)
280 struct rt_sigframe *frame;
285 frame = get_sigframe(ka, regs, sizeof(*frame));
287 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
290 usig = current_thread_info()->exec_domain
291 && current_thread_info()->exec_domain->signal_invmap
293 ? current_thread_info()->exec_domain->signal_invmap[sig]
296 err |= __put_user(usig, &frame->sig);
300 err |= __put_user(&frame->info, &frame->pinfo);
301 err |= __put_user(&frame->uc, &frame->puc);
302 err |= copy_siginfo_to_user(&frame->info, info);
306 /* Create the ucontext. */
307 err |= __put_user(0, &frame->uc.uc_flags);
308 err |= __put_user(0, &frame->uc.uc_link);
309 err |= __save_altstack(&frame->uc.uc_stack, rdusp());
310 err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
311 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
315 /* Set up to return from userspace. */
316 ret = frame->retcode;
317 if (ka->sa.sa_flags & SA_RESTORER)
318 ret = (unsigned char *)(ka->sa.sa_restorer);
320 /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
321 err |= __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
322 (unsigned long *)(frame->retcode + 0));
323 err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
325 err |= __put_user(ret, &frame->pretcode);
330 /* Set up registers for signal handler */
331 wrusp ((unsigned long) frame);
332 regs->pc = (unsigned long) ka->sa.sa_handler;
333 regs->er0 = (current_thread_info()->exec_domain
334 && current_thread_info()->exec_domain->signal_invmap
336 ? current_thread_info()->exec_domain->signal_invmap[sig]
338 regs->er1 = (unsigned long)&(frame->info);
339 regs->er2 = (unsigned long)&frame->uc;
340 regs->er5 = current->mm->start_data; /* GOT base */
345 force_sigsegv(sig, current);
350 * OK, we're invoking a handler
353 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
354 struct pt_regs * regs)
356 sigset_t *oldset = sigmask_to_save();
358 /* are we from a system call? */
359 if (regs->orig_er0 >= 0) {
361 case -ERESTART_RESTARTBLOCK:
362 case -ERESTARTNOHAND:
367 if (!(ka->sa.sa_flags & SA_RESTART)) {
372 case -ERESTARTNOINTR:
373 regs->er0 = regs->orig_er0;
378 /* set up the stack frame */
379 if (ka->sa.sa_flags & SA_SIGINFO)
380 ret = setup_rt_frame(sig, ka, info, oldset, regs);
382 ret = setup_frame(sig, ka, oldset, regs);
385 signal_delivered(sig, info, ka, regs, 0);
389 * Note that 'init' is a special process: it doesn't get signals it doesn't
390 * want to handle. Thus you cannot kill init even with a SIGKILL even by
393 static void do_signal(struct pt_regs *regs)
397 struct k_sigaction ka;
400 * We want the common case to go fast, which
401 * is why we may in certain cases get here from
402 * kernel mode. Just return without doing anything
405 if ((regs->ccr & 0x10))
408 current->thread.esp0 = (unsigned long) regs;
410 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
412 /* Whee! Actually deliver the signal. */
413 handle_signal(signr, &info, &ka, regs);
416 /* Did we come from a system call? */
417 if (regs->orig_er0 >= 0) {
418 /* Restart the system call - no handlers present */
419 if (regs->er0 == -ERESTARTNOHAND ||
420 regs->er0 == -ERESTARTSYS ||
421 regs->er0 == -ERESTARTNOINTR) {
422 regs->er0 = regs->orig_er0;
425 if (regs->er0 == -ERESTART_RESTARTBLOCK){
426 regs->er0 = __NR_restart_syscall;
431 /* If there's no signal to deliver, we just restore the saved mask. */
432 restore_saved_sigmask();
435 asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
437 if (thread_info_flags & _TIF_SIGPENDING)
440 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
441 clear_thread_flag(TIF_NOTIFY_RESUME);
442 tracehook_notify_resume(regs);