2 * linux/arch/sh/kernel/signal.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
11 #include <linux/sched.h>
13 #include <linux/smp.h>
14 #include <linux/smp_lock.h>
15 #include <linux/kernel.h>
16 #include <linux/signal.h>
17 #include <linux/errno.h>
18 #include <linux/wait.h>
19 #include <linux/ptrace.h>
20 #include <linux/unistd.h>
21 #include <linux/stddef.h>
22 #include <linux/tty.h>
23 #include <linux/elf.h>
24 #include <linux/personality.h>
25 #include <linux/binfmts.h>
27 #include <asm/ucontext.h>
28 #include <asm/uaccess.h>
29 #include <asm/pgtable.h>
30 #include <asm/cacheflush.h>
32 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
35 * Atomically swap in the new signal mask, and wait for a signal.
38 sys_sigsuspend(old_sigset_t mask,
39 unsigned long r5, unsigned long r6, unsigned long r7,
43 spin_lock_irq(¤t->sighand->siglock);
44 current->saved_sigmask = current->blocked;
45 siginitset(¤t->blocked, mask);
47 spin_unlock_irq(¤t->sighand->siglock);
49 current->state = TASK_INTERRUPTIBLE;
51 set_thread_flag(TIF_RESTORE_SIGMASK);
52 return -ERESTARTNOHAND;
56 sys_sigaction(int sig, const struct old_sigaction __user *act,
57 struct old_sigaction __user *oact)
59 struct k_sigaction new_ka, old_ka;
64 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
65 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
66 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
68 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
69 __get_user(mask, &act->sa_mask);
70 siginitset(&new_ka.sa.sa_mask, mask);
73 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
76 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
77 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
78 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
80 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
81 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
88 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
89 unsigned long r6, unsigned long r7,
92 return do_sigaltstack(uss, uoss, regs.regs[15]);
97 * Do a signal return; undo the signal stack.
100 #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
101 #if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A)
102 #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */
104 #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */
106 #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
110 struct sigcontext sc;
111 unsigned long extramask[_NSIG_WORDS-1];
123 static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
125 struct task_struct *tsk = current;
127 if (!(cpu_data->flags & CPU_HAS_FPU))
131 return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
132 sizeof(long)*(16*2+2));
135 static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
136 struct pt_regs *regs)
138 struct task_struct *tsk = current;
140 if (!(cpu_data->flags & CPU_HAS_FPU))
144 __put_user(0, &sc->sc_ownedfp);
148 __put_user(1, &sc->sc_ownedfp);
150 /* This will cause a "finit" to be triggered by the next
151 attempted FPU operation by the 'current' process.
155 unlazy_fpu(tsk, regs);
156 return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
157 sizeof(long)*(16*2+2));
159 #endif /* CONFIG_SH_FPU */
162 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
164 unsigned int err = 0;
166 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
168 COPY(regs[2]); COPY(regs[3]);
169 COPY(regs[4]); COPY(regs[5]);
170 COPY(regs[6]); COPY(regs[7]);
171 COPY(regs[8]); COPY(regs[9]);
172 COPY(regs[10]); COPY(regs[11]);
173 COPY(regs[12]); COPY(regs[13]);
174 COPY(regs[14]); COPY(regs[15]);
175 COPY(gbr); COPY(mach);
176 COPY(macl); COPY(pr);
181 if (cpu_data->flags & CPU_HAS_FPU) {
183 struct task_struct *tsk = current;
185 regs->sr |= SR_FD; /* Release FPU */
186 clear_fpu(tsk, regs);
188 __get_user (owned_fp, &sc->sc_ownedfp);
190 err |= restore_sigcontext_fpu(sc);
194 regs->tra = -1; /* disable syscall checks */
195 err |= __get_user(*r0_p, &sc->sc_regs[0]);
199 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
200 unsigned long r6, unsigned long r7,
203 struct sigframe __user *frame = (struct sigframe __user *)regs.regs[15];
207 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
210 if (__get_user(set.sig[0], &frame->sc.oldmask)
212 && __copy_from_user(&set.sig[1], &frame->extramask,
213 sizeof(frame->extramask))))
216 sigdelsetmask(&set, ~_BLOCKABLE);
218 spin_lock_irq(¤t->sighand->siglock);
219 current->blocked = set;
221 spin_unlock_irq(¤t->sighand->siglock);
223 if (restore_sigcontext(®s, &frame->sc, &r0))
228 force_sig(SIGSEGV, current);
232 asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
233 unsigned long r6, unsigned long r7,
236 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.regs[15];
241 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
244 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
247 sigdelsetmask(&set, ~_BLOCKABLE);
248 spin_lock_irq(¤t->sighand->siglock);
249 current->blocked = set;
251 spin_unlock_irq(¤t->sighand->siglock);
253 if (restore_sigcontext(®s, &frame->uc.uc_mcontext, &r0))
256 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
258 /* It is more difficult to avoid calling this function than to
259 call it and ignore errors. */
260 do_sigaltstack(&st, NULL, regs.regs[15]);
265 force_sig(SIGSEGV, current);
270 * Set up a signal frame.
274 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
279 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
280 COPY(regs[0]); COPY(regs[1]);
281 COPY(regs[2]); COPY(regs[3]);
282 COPY(regs[4]); COPY(regs[5]);
283 COPY(regs[6]); COPY(regs[7]);
284 COPY(regs[8]); COPY(regs[9]);
285 COPY(regs[10]); COPY(regs[11]);
286 COPY(regs[12]); COPY(regs[13]);
287 COPY(regs[14]); COPY(regs[15]);
288 COPY(gbr); COPY(mach);
289 COPY(macl); COPY(pr);
294 err |= save_sigcontext_fpu(sc, regs);
297 /* non-iBCS2 extensions.. */
298 err |= __put_user(mask, &sc->oldmask);
304 * Determine which stack to use..
306 static inline void __user *
307 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
309 if (ka->sa.sa_flags & SA_ONSTACK) {
310 if (sas_ss_flags(sp) == 0)
311 sp = current->sas_ss_sp + current->sas_ss_size;
314 return (void __user *)((sp - frame_size) & -8ul);
317 /* These symbols are defined with the addresses in the vsyscall page.
318 See vsyscall-trapa.S. */
319 extern void __user __kernel_sigreturn;
320 extern void __user __kernel_rt_sigreturn;
322 static int setup_frame(int sig, struct k_sigaction *ka,
323 sigset_t *set, struct pt_regs *regs)
325 struct sigframe __user *frame;
329 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
331 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
334 signal = current_thread_info()->exec_domain
335 && current_thread_info()->exec_domain->signal_invmap
337 ? current_thread_info()->exec_domain->signal_invmap[sig]
340 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
343 err |= __copy_to_user(frame->extramask, &set->sig[1],
344 sizeof(frame->extramask));
346 /* Set up to return from userspace. If provided, use a stub
347 already in userspace. */
348 if (ka->sa.sa_flags & SA_RESTORER) {
349 regs->pr = (unsigned long) ka->sa.sa_restorer;
350 #ifdef CONFIG_VSYSCALL
351 } else if (likely(current->mm->context.vdso)) {
352 regs->pr = VDSO_SYM(&__kernel_sigreturn);
355 /* Generate return code (system call to sigreturn) */
356 err |= __put_user(MOVW(7), &frame->retcode[0]);
357 err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
358 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
359 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
360 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
361 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
362 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
363 err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
364 regs->pr = (unsigned long) frame->retcode;
370 /* Set up registers for signal handler */
371 regs->regs[15] = (unsigned long) frame;
372 regs->regs[4] = signal; /* Arg for signal handler */
374 regs->regs[6] = (unsigned long) &frame->sc;
375 regs->pc = (unsigned long) ka->sa.sa_handler;
379 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
380 current->comm, current->pid, frame, regs->pc, regs->pr);
382 flush_cache_sigtramp(regs->pr);
384 if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
385 flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
390 force_sigsegv(sig, current);
394 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
395 sigset_t *set, struct pt_regs *regs)
397 struct rt_sigframe __user *frame;
401 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
403 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
406 signal = current_thread_info()->exec_domain
407 && current_thread_info()->exec_domain->signal_invmap
409 ? current_thread_info()->exec_domain->signal_invmap[sig]
412 err |= copy_siginfo_to_user(&frame->info, info);
414 /* Create the ucontext. */
415 err |= __put_user(0, &frame->uc.uc_flags);
416 err |= __put_user(0, &frame->uc.uc_link);
417 err |= __put_user((void *)current->sas_ss_sp,
418 &frame->uc.uc_stack.ss_sp);
419 err |= __put_user(sas_ss_flags(regs->regs[15]),
420 &frame->uc.uc_stack.ss_flags);
421 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
422 err |= setup_sigcontext(&frame->uc.uc_mcontext,
424 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
426 /* Set up to return from userspace. If provided, use a stub
427 already in userspace. */
428 if (ka->sa.sa_flags & SA_RESTORER) {
429 regs->pr = (unsigned long) ka->sa.sa_restorer;
430 #ifdef CONFIG_VSYSCALL
431 } else if (likely(current->mm->context.vdso)) {
432 regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
435 /* Generate return code (system call to rt_sigreturn) */
436 err |= __put_user(MOVW(7), &frame->retcode[0]);
437 err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
438 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
439 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
440 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
441 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
442 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
443 err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
444 regs->pr = (unsigned long) frame->retcode;
450 /* Set up registers for signal handler */
451 regs->regs[15] = (unsigned long) frame;
452 regs->regs[4] = signal; /* Arg for signal handler */
453 regs->regs[5] = (unsigned long) &frame->info;
454 regs->regs[6] = (unsigned long) &frame->uc;
455 regs->pc = (unsigned long) ka->sa.sa_handler;
459 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
460 current->comm, current->pid, frame, regs->pc, regs->pr);
462 flush_cache_sigtramp(regs->pr);
464 if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
465 flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
470 force_sigsegv(sig, current);
475 * OK, we're invoking a handler
479 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
480 sigset_t *oldset, struct pt_regs *regs)
484 /* Are we from a system call? */
485 if (regs->tra >= 0) {
486 /* If so, check system call restarting.. */
487 switch (regs->regs[0]) {
488 case -ERESTARTNOHAND:
489 regs->regs[0] = -EINTR;
493 if (!(ka->sa.sa_flags & SA_RESTART)) {
494 regs->regs[0] = -EINTR;
498 case -ERESTARTNOINTR:
503 #ifdef CONFIG_PREEMPT
506 local_irq_save(flags);
508 if (regs->regs[15] >= 0xc0000000) {
509 int offset = (int)regs->regs[15];
511 /* Reset stack pointer: clear critical region mark */
512 regs->regs[15] = regs->regs[1];
513 if (regs->pc < regs->regs[0])
514 /* Go to rewind point #1 */
515 regs->pc = regs->regs[0] + offset - 2;
517 #ifdef CONFIG_PREEMPT
518 local_irq_restore(flags);
522 /* Set up the stack frame */
523 if (ka->sa.sa_flags & SA_SIGINFO)
524 ret = setup_rt_frame(sig, ka, info, oldset, regs);
526 ret = setup_frame(sig, ka, oldset, regs);
528 if (ka->sa.sa_flags & SA_ONESHOT)
529 ka->sa.sa_handler = SIG_DFL;
532 spin_lock_irq(¤t->sighand->siglock);
533 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
534 if (!(ka->sa.sa_flags & SA_NODEFER))
535 sigaddset(¤t->blocked,sig);
537 spin_unlock_irq(¤t->sighand->siglock);
544 * Note that 'init' is a special process: it doesn't get signals it doesn't
545 * want to handle. Thus you cannot kill init even with a SIGKILL even by
548 * Note that we go through the signals twice: once to check the signals that
549 * the kernel can handle, and then we build all the user-level signal handling
550 * stack-frames in one go after that.
552 static void do_signal(struct pt_regs *regs, unsigned int save_r0)
556 struct k_sigaction ka;
560 * We want the common case to go fast, which
561 * is why we may in certain cases get here from
562 * kernel mode. Just return without doing anything
565 if (!user_mode(regs))
571 if (test_thread_flag(TIF_RESTORE_SIGMASK))
572 oldset = ¤t->saved_sigmask;
574 oldset = ¤t->blocked;
576 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
578 /* Whee! Actually deliver the signal. */
579 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
580 /* a signal was successfully delivered; the saved
581 * sigmask will have been stored in the signal frame,
582 * and will be restored by sigreturn, so we can simply
583 * clear the TIF_RESTORE_SIGMASK flag */
584 if (test_thread_flag(TIF_RESTORE_SIGMASK))
585 clear_thread_flag(TIF_RESTORE_SIGMASK);
590 /* Did we come from a system call? */
591 if (regs->tra >= 0) {
592 /* Restart the system call - no handlers present */
593 if (regs->regs[0] == -ERESTARTNOHAND ||
594 regs->regs[0] == -ERESTARTSYS ||
595 regs->regs[0] == -ERESTARTNOINTR) {
596 regs->regs[0] = save_r0;
598 } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
600 regs->regs[3] = __NR_restart_syscall;
604 /* if there's no signal to deliver, we just put the saved sigmask
606 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
607 clear_thread_flag(TIF_RESTORE_SIGMASK);
608 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
612 asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
613 __u32 thread_info_flags)
615 /* deal with pending signal delivery */
616 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
617 do_signal(regs, save_r0);