1 /* $Id: signal.c,v 1.21 2004/06/28 13:18:44 doyu Exp $
3 * linux/arch/sh/kernel/signal.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
7 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
9 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
13 #include <linux/sched.h>
15 #include <linux/smp.h>
16 #include <linux/smp_lock.h>
17 #include <linux/kernel.h>
18 #include <linux/signal.h>
19 #include <linux/errno.h>
20 #include <linux/wait.h>
21 #include <linux/ptrace.h>
22 #include <linux/unistd.h>
23 #include <linux/stddef.h>
24 #include <linux/tty.h>
25 #include <linux/personality.h>
26 #include <linux/binfmts.h>
28 #include <asm/ucontext.h>
29 #include <asm/uaccess.h>
30 #include <asm/pgtable.h>
31 #include <asm/cacheflush.h>
35 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
37 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
40 * Atomically swap in the new signal mask, and wait for a signal.
43 sys_sigsuspend(old_sigset_t mask,
44 unsigned long r5, unsigned long r6, unsigned long r7,
50 spin_lock_irq(¤t->sighand->siglock);
51 saveset = current->blocked;
52 siginitset(¤t->blocked, mask);
54 spin_unlock_irq(¤t->sighand->siglock);
56 regs.regs[0] = -EINTR;
58 current->state = TASK_INTERRUPTIBLE;
60 if (do_signal(®s, &saveset))
66 sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
67 unsigned long r6, unsigned long r7,
70 sigset_t saveset, newset;
72 /* XXX: Don't preclude handling different sized sigset_t's. */
73 if (sigsetsize != sizeof(sigset_t))
76 if (copy_from_user(&newset, unewset, sizeof(newset)))
78 sigdelsetmask(&newset, ~_BLOCKABLE);
79 spin_lock_irq(¤t->sighand->siglock);
80 saveset = current->blocked;
81 current->blocked = newset;
83 spin_unlock_irq(¤t->sighand->siglock);
85 regs.regs[0] = -EINTR;
87 current->state = TASK_INTERRUPTIBLE;
89 if (do_signal(®s, &saveset))
95 sys_sigaction(int sig, const struct old_sigaction __user *act,
96 struct old_sigaction __user *oact)
98 struct k_sigaction new_ka, old_ka;
103 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
104 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
105 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
107 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
108 __get_user(mask, &act->sa_mask);
109 siginitset(&new_ka.sa.sa_mask, mask);
112 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
115 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
116 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
117 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
119 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
120 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
127 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
128 unsigned long r6, unsigned long r7,
131 return do_sigaltstack(uss, uoss, regs.regs[15]);
136 * Do a signal return; undo the signal stack.
139 #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
140 #define TRAP16 0xc310 /* Syscall w/no args (NR in R3) */
141 #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
145 struct sigcontext sc;
146 unsigned long extramask[_NSIG_WORDS-1];
158 static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
160 struct task_struct *tsk = current;
162 if (!(cpu_data->flags & CPU_HAS_FPU))
166 return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
167 sizeof(long)*(16*2+2));
170 static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
171 struct pt_regs *regs)
173 struct task_struct *tsk = current;
175 if (!(cpu_data->flags & CPU_HAS_FPU))
179 __put_user(0, &sc->sc_ownedfp);
183 __put_user(1, &sc->sc_ownedfp);
185 /* This will cause a "finit" to be triggered by the next
186 attempted FPU operation by the 'current' process.
190 unlazy_fpu(tsk, regs);
191 return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
192 sizeof(long)*(16*2+2));
194 #endif /* CONFIG_SH_FPU */
197 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
199 unsigned int err = 0;
201 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
203 COPY(regs[2]); COPY(regs[3]);
204 COPY(regs[4]); COPY(regs[5]);
205 COPY(regs[6]); COPY(regs[7]);
206 COPY(regs[8]); COPY(regs[9]);
207 COPY(regs[10]); COPY(regs[11]);
208 COPY(regs[12]); COPY(regs[13]);
209 COPY(regs[14]); COPY(regs[15]);
210 COPY(gbr); COPY(mach);
211 COPY(macl); COPY(pr);
216 if (cpu_data->flags & CPU_HAS_FPU) {
218 struct task_struct *tsk = current;
220 regs->sr |= SR_FD; /* Release FPU */
221 clear_fpu(tsk, regs);
223 __get_user (owned_fp, &sc->sc_ownedfp);
225 err |= restore_sigcontext_fpu(sc);
229 regs->tra = -1; /* disable syscall checks */
230 err |= __get_user(*r0_p, &sc->sc_regs[0]);
234 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
235 unsigned long r6, unsigned long r7,
238 struct sigframe __user *frame = (struct sigframe __user *)regs.regs[15];
242 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
245 if (__get_user(set.sig[0], &frame->sc.oldmask)
247 && __copy_from_user(&set.sig[1], &frame->extramask,
248 sizeof(frame->extramask))))
251 sigdelsetmask(&set, ~_BLOCKABLE);
253 spin_lock_irq(¤t->sighand->siglock);
254 current->blocked = set;
256 spin_unlock_irq(¤t->sighand->siglock);
258 if (restore_sigcontext(®s, &frame->sc, &r0))
263 force_sig(SIGSEGV, current);
267 asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
268 unsigned long r6, unsigned long r7,
271 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.regs[15];
276 if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
279 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
282 sigdelsetmask(&set, ~_BLOCKABLE);
283 spin_lock_irq(¤t->sighand->siglock);
284 current->blocked = set;
286 spin_unlock_irq(¤t->sighand->siglock);
288 if (restore_sigcontext(®s, &frame->uc.uc_mcontext, &r0))
291 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
293 /* It is more difficult to avoid calling this function than to
294 call it and ignore errors. */
295 do_sigaltstack(&st, NULL, regs.regs[15]);
300 force_sig(SIGSEGV, current);
305 * Set up a signal frame.
309 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
314 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
315 COPY(regs[0]); COPY(regs[1]);
316 COPY(regs[2]); COPY(regs[3]);
317 COPY(regs[4]); COPY(regs[5]);
318 COPY(regs[6]); COPY(regs[7]);
319 COPY(regs[8]); COPY(regs[9]);
320 COPY(regs[10]); COPY(regs[11]);
321 COPY(regs[12]); COPY(regs[13]);
322 COPY(regs[14]); COPY(regs[15]);
323 COPY(gbr); COPY(mach);
324 COPY(macl); COPY(pr);
329 err |= save_sigcontext_fpu(sc, regs);
332 /* non-iBCS2 extensions.. */
333 err |= __put_user(mask, &sc->oldmask);
339 * Determine which stack to use..
341 static inline void __user *
342 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
344 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp))
345 sp = current->sas_ss_sp + current->sas_ss_size;
347 return (void __user *)((sp - frame_size) & -8ul);
350 static void setup_frame(int sig, struct k_sigaction *ka,
351 sigset_t *set, struct pt_regs *regs)
353 struct sigframe __user *frame;
357 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
359 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
362 signal = current_thread_info()->exec_domain
363 && current_thread_info()->exec_domain->signal_invmap
365 ? current_thread_info()->exec_domain->signal_invmap[sig]
368 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
370 if (_NSIG_WORDS > 1) {
371 err |= __copy_to_user(frame->extramask, &set->sig[1],
372 sizeof(frame->extramask));
375 /* Set up to return from userspace. If provided, use a stub
376 already in userspace. */
377 if (ka->sa.sa_flags & SA_RESTORER) {
378 regs->pr = (unsigned long) ka->sa.sa_restorer;
380 /* Generate return code (system call to sigreturn) */
381 err |= __put_user(MOVW(7), &frame->retcode[0]);
382 err |= __put_user(TRAP16, &frame->retcode[1]);
383 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
384 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
385 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
386 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
387 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
388 err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
389 regs->pr = (unsigned long) frame->retcode;
395 /* Set up registers for signal handler */
396 regs->regs[15] = (unsigned long) frame;
397 regs->regs[4] = signal; /* Arg for signal handler */
399 regs->regs[6] = (unsigned long) &frame->sc;
400 regs->pc = (unsigned long) ka->sa.sa_handler;
405 printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
406 current->comm, current->pid, frame, regs->pc, regs->pr);
409 flush_cache_sigtramp(regs->pr);
410 if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
411 flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
415 force_sigsegv(sig, current);
418 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
419 sigset_t *set, struct pt_regs *regs)
421 struct rt_sigframe __user *frame;
425 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
427 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
430 signal = current_thread_info()->exec_domain
431 && current_thread_info()->exec_domain->signal_invmap
433 ? current_thread_info()->exec_domain->signal_invmap[sig]
436 err |= copy_siginfo_to_user(&frame->info, info);
438 /* Create the ucontext. */
439 err |= __put_user(0, &frame->uc.uc_flags);
440 err |= __put_user(0, &frame->uc.uc_link);
441 err |= __put_user((void *)current->sas_ss_sp,
442 &frame->uc.uc_stack.ss_sp);
443 err |= __put_user(sas_ss_flags(regs->regs[15]),
444 &frame->uc.uc_stack.ss_flags);
445 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
446 err |= setup_sigcontext(&frame->uc.uc_mcontext,
448 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
450 /* Set up to return from userspace. If provided, use a stub
451 already in userspace. */
452 if (ka->sa.sa_flags & SA_RESTORER) {
453 regs->pr = (unsigned long) ka->sa.sa_restorer;
455 /* Generate return code (system call to rt_sigreturn) */
456 err |= __put_user(MOVW(7), &frame->retcode[0]);
457 err |= __put_user(TRAP16, &frame->retcode[1]);
458 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
459 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
460 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
461 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
462 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
463 err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
464 regs->pr = (unsigned long) frame->retcode;
470 /* Set up registers for signal handler */
471 regs->regs[15] = (unsigned long) frame;
472 regs->regs[4] = signal; /* Arg for signal handler */
473 regs->regs[5] = (unsigned long) &frame->info;
474 regs->regs[6] = (unsigned long) &frame->uc;
475 regs->pc = (unsigned long) ka->sa.sa_handler;
480 printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
481 current->comm, current->pid, frame, regs->pc, regs->pr);
484 flush_cache_sigtramp(regs->pr);
485 if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
486 flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
490 force_sigsegv(sig, current);
494 * OK, we're invoking a handler
498 handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
499 sigset_t *oldset, struct pt_regs *regs)
501 /* Are we from a system call? */
502 if (regs->tra >= 0) {
503 /* If so, check system call restarting.. */
504 switch (regs->regs[0]) {
505 case -ERESTARTNOHAND:
506 regs->regs[0] = -EINTR;
510 if (!(ka->sa.sa_flags & SA_RESTART)) {
511 regs->regs[0] = -EINTR;
515 case -ERESTARTNOINTR:
520 #ifdef CONFIG_PREEMPT
523 local_irq_save(flags);
525 if (regs->regs[15] >= 0xc0000000) {
526 int offset = (int)regs->regs[15];
528 /* Reset stack pointer: clear critical region mark */
529 regs->regs[15] = regs->regs[1];
530 if (regs->pc < regs->regs[0])
531 /* Go to rewind point #1 */
532 regs->pc = regs->regs[0] + offset - 2;
534 #ifdef CONFIG_PREEMPT
535 local_irq_restore(flags);
539 /* Set up the stack frame */
540 if (ka->sa.sa_flags & SA_SIGINFO)
541 setup_rt_frame(sig, ka, info, oldset, regs);
543 setup_frame(sig, ka, oldset, regs);
545 if (ka->sa.sa_flags & SA_ONESHOT)
546 ka->sa.sa_handler = SIG_DFL;
548 if (!(ka->sa.sa_flags & SA_NODEFER)) {
549 spin_lock_irq(¤t->sighand->siglock);
550 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
551 sigaddset(¤t->blocked,sig);
553 spin_unlock_irq(¤t->sighand->siglock);
558 * Note that 'init' is a special process: it doesn't get signals it doesn't
559 * want to handle. Thus you cannot kill init even with a SIGKILL even by
562 * Note that we go through the signals twice: once to check the signals that
563 * the kernel can handle, and then we build all the user-level signal handling
564 * stack-frames in one go after that.
566 int do_signal(struct pt_regs *regs, sigset_t *oldset)
570 struct k_sigaction ka;
573 * We want the common case to go fast, which
574 * is why we may in certain cases get here from
575 * kernel mode. Just return without doing anything
578 if (!user_mode(regs))
581 if (try_to_freeze(0))
585 oldset = ¤t->blocked;
587 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
589 /* Whee! Actually deliver the signal. */
590 handle_signal(signr, &ka, &info, oldset, regs);
595 /* Did we come from a system call? */
596 if (regs->tra >= 0) {
597 /* Restart the system call - no handlers present */
598 if (regs->regs[0] == -ERESTARTNOHAND ||
599 regs->regs[0] == -ERESTARTSYS ||
600 regs->regs[0] == -ERESTARTNOINTR ||
601 regs->regs[0] == -ERESTART_RESTARTBLOCK) {