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/kernel.h>
15 #include <linux/signal.h>
16 #include <linux/errno.h>
17 #include <linux/wait.h>
18 #include <linux/ptrace.h>
19 #include <linux/unistd.h>
20 #include <linux/stddef.h>
21 #include <linux/tty.h>
22 #include <linux/elf.h>
23 #include <linux/personality.h>
24 #include <linux/binfmts.h>
25 #include <linux/freezer.h>
27 #include <linux/tracehook.h>
28 #include <asm/system.h>
29 #include <asm/ucontext.h>
30 #include <asm/uaccess.h>
31 #include <asm/pgtable.h>
32 #include <asm/cacheflush.h>
33 #include <asm/syscalls.h>
36 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38 struct fdpic_func_descriptor {
44 * Atomically swap in the new signal mask, and wait for a signal.
47 sys_sigsuspend(old_sigset_t mask,
48 unsigned long r5, unsigned long r6, unsigned long r7,
49 struct pt_regs __regs)
52 spin_lock_irq(¤t->sighand->siglock);
53 current->saved_sigmask = current->blocked;
54 siginitset(¤t->blocked, mask);
56 spin_unlock_irq(¤t->sighand->siglock);
58 current->state = TASK_INTERRUPTIBLE;
60 set_thread_flag(TIF_RESTORE_SIGMASK);
61 return -ERESTARTNOHAND;
65 sys_sigaction(int sig, const struct old_sigaction __user *act,
66 struct old_sigaction __user *oact)
68 struct k_sigaction new_ka, old_ka;
73 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
74 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
75 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
77 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
78 __get_user(mask, &act->sa_mask);
79 siginitset(&new_ka.sa.sa_mask, mask);
82 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
85 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
86 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
87 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
89 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
90 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
97 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
98 unsigned long r6, unsigned long r7,
99 struct pt_regs __regs)
101 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
103 return do_sigaltstack(uss, uoss, regs->regs[15]);
108 * Do a signal return; undo the signal stack.
111 #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */
112 #if defined(CONFIG_CPU_SH2)
113 #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */
115 #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */
117 #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
121 struct sigcontext sc;
122 unsigned long extramask[_NSIG_WORDS-1];
134 static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
136 struct task_struct *tsk = current;
138 if (!(current_cpu_data.flags & CPU_HAS_FPU))
142 return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
143 sizeof(long)*(16*2+2));
146 static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
147 struct pt_regs *regs)
149 struct task_struct *tsk = current;
151 if (!(current_cpu_data.flags & CPU_HAS_FPU))
155 __put_user(0, &sc->sc_ownedfp);
159 __put_user(1, &sc->sc_ownedfp);
161 /* This will cause a "finit" to be triggered by the next
162 attempted FPU operation by the 'current' process.
166 unlazy_fpu(tsk, regs);
167 return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
168 sizeof(long)*(16*2+2));
170 #endif /* CONFIG_SH_FPU */
173 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
175 unsigned int err = 0;
177 #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
179 COPY(regs[2]); COPY(regs[3]);
180 COPY(regs[4]); COPY(regs[5]);
181 COPY(regs[6]); COPY(regs[7]);
182 COPY(regs[8]); COPY(regs[9]);
183 COPY(regs[10]); COPY(regs[11]);
184 COPY(regs[12]); COPY(regs[13]);
185 COPY(regs[14]); COPY(regs[15]);
186 COPY(gbr); COPY(mach);
187 COPY(macl); COPY(pr);
192 if (current_cpu_data.flags & CPU_HAS_FPU) {
194 struct task_struct *tsk = current;
196 regs->sr |= SR_FD; /* Release FPU */
197 clear_fpu(tsk, regs);
199 __get_user (owned_fp, &sc->sc_ownedfp);
201 err |= restore_sigcontext_fpu(sc);
205 regs->tra = -1; /* disable syscall checks */
206 err |= __get_user(*r0_p, &sc->sc_regs[0]);
210 asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
211 unsigned long r6, unsigned long r7,
212 struct pt_regs __regs)
214 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
215 struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15];
219 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
222 if (__get_user(set.sig[0], &frame->sc.oldmask)
224 && __copy_from_user(&set.sig[1], &frame->extramask,
225 sizeof(frame->extramask))))
228 sigdelsetmask(&set, ~_BLOCKABLE);
230 spin_lock_irq(¤t->sighand->siglock);
231 current->blocked = set;
233 spin_unlock_irq(¤t->sighand->siglock);
235 if (restore_sigcontext(regs, &frame->sc, &r0))
240 force_sig(SIGSEGV, current);
244 asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
245 unsigned long r6, unsigned long r7,
246 struct pt_regs __regs)
248 struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
249 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15];
253 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
256 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
259 sigdelsetmask(&set, ~_BLOCKABLE);
260 spin_lock_irq(¤t->sighand->siglock);
261 current->blocked = set;
263 spin_unlock_irq(¤t->sighand->siglock);
265 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
268 if (do_sigaltstack(&frame->uc.uc_stack, NULL,
269 regs->regs[15]) == -EFAULT)
275 force_sig(SIGSEGV, current);
280 * Set up a signal frame.
284 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
289 #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
290 COPY(regs[0]); COPY(regs[1]);
291 COPY(regs[2]); COPY(regs[3]);
292 COPY(regs[4]); COPY(regs[5]);
293 COPY(regs[6]); COPY(regs[7]);
294 COPY(regs[8]); COPY(regs[9]);
295 COPY(regs[10]); COPY(regs[11]);
296 COPY(regs[12]); COPY(regs[13]);
297 COPY(regs[14]); COPY(regs[15]);
298 COPY(gbr); COPY(mach);
299 COPY(macl); COPY(pr);
304 err |= save_sigcontext_fpu(sc, regs);
307 /* non-iBCS2 extensions.. */
308 err |= __put_user(mask, &sc->oldmask);
314 * Determine which stack to use..
316 static inline void __user *
317 get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
319 if (ka->sa.sa_flags & SA_ONSTACK) {
320 if (sas_ss_flags(sp) == 0)
321 sp = current->sas_ss_sp + current->sas_ss_size;
324 return (void __user *)((sp - frame_size) & -8ul);
327 /* These symbols are defined with the addresses in the vsyscall page.
328 See vsyscall-trapa.S. */
329 extern void __user __kernel_sigreturn;
330 extern void __user __kernel_rt_sigreturn;
332 static int setup_frame(int sig, struct k_sigaction *ka,
333 sigset_t *set, struct pt_regs *regs)
335 struct sigframe __user *frame;
339 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
341 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
344 signal = current_thread_info()->exec_domain
345 && current_thread_info()->exec_domain->signal_invmap
347 ? current_thread_info()->exec_domain->signal_invmap[sig]
350 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
353 err |= __copy_to_user(frame->extramask, &set->sig[1],
354 sizeof(frame->extramask));
356 /* Set up to return from userspace. If provided, use a stub
357 already in userspace. */
358 if (ka->sa.sa_flags & SA_RESTORER) {
359 regs->pr = (unsigned long) ka->sa.sa_restorer;
360 #ifdef CONFIG_VSYSCALL
361 } else if (likely(current->mm->context.vdso)) {
362 regs->pr = VDSO_SYM(&__kernel_sigreturn);
365 /* Generate return code (system call to sigreturn) */
366 err |= __put_user(MOVW(7), &frame->retcode[0]);
367 err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
368 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
369 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
370 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
371 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
372 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
373 err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
374 regs->pr = (unsigned long) frame->retcode;
375 flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
381 /* Set up registers for signal handler */
382 regs->regs[15] = (unsigned long) frame;
383 regs->regs[4] = signal; /* Arg for signal handler */
385 regs->regs[6] = (unsigned long) &frame->sc;
387 if (current->personality & FDPIC_FUNCPTRS) {
388 struct fdpic_func_descriptor __user *funcptr =
389 (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
391 __get_user(regs->pc, &funcptr->text);
392 __get_user(regs->regs[12], &funcptr->GOT);
394 regs->pc = (unsigned long)ka->sa.sa_handler;
398 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
399 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
404 force_sigsegv(sig, current);
408 static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
409 sigset_t *set, struct pt_regs *regs)
411 struct rt_sigframe __user *frame;
415 frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
417 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
420 signal = current_thread_info()->exec_domain
421 && current_thread_info()->exec_domain->signal_invmap
423 ? current_thread_info()->exec_domain->signal_invmap[sig]
426 err |= copy_siginfo_to_user(&frame->info, info);
428 /* Create the ucontext. */
429 err |= __put_user(0, &frame->uc.uc_flags);
430 err |= __put_user(NULL, &frame->uc.uc_link);
431 err |= __put_user((void *)current->sas_ss_sp,
432 &frame->uc.uc_stack.ss_sp);
433 err |= __put_user(sas_ss_flags(regs->regs[15]),
434 &frame->uc.uc_stack.ss_flags);
435 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
436 err |= setup_sigcontext(&frame->uc.uc_mcontext,
438 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
440 /* Set up to return from userspace. If provided, use a stub
441 already in userspace. */
442 if (ka->sa.sa_flags & SA_RESTORER) {
443 regs->pr = (unsigned long) ka->sa.sa_restorer;
444 #ifdef CONFIG_VSYSCALL
445 } else if (likely(current->mm->context.vdso)) {
446 regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
449 /* Generate return code (system call to rt_sigreturn) */
450 err |= __put_user(MOVW(7), &frame->retcode[0]);
451 err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
452 err |= __put_user(OR_R0_R0, &frame->retcode[2]);
453 err |= __put_user(OR_R0_R0, &frame->retcode[3]);
454 err |= __put_user(OR_R0_R0, &frame->retcode[4]);
455 err |= __put_user(OR_R0_R0, &frame->retcode[5]);
456 err |= __put_user(OR_R0_R0, &frame->retcode[6]);
457 err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
458 regs->pr = (unsigned long) frame->retcode;
464 /* Set up registers for signal handler */
465 regs->regs[15] = (unsigned long) frame;
466 regs->regs[4] = signal; /* Arg for signal handler */
467 regs->regs[5] = (unsigned long) &frame->info;
468 regs->regs[6] = (unsigned long) &frame->uc;
470 if (current->personality & FDPIC_FUNCPTRS) {
471 struct fdpic_func_descriptor __user *funcptr =
472 (struct fdpic_func_descriptor __user *)ka->sa.sa_handler;
474 __get_user(regs->pc, &funcptr->text);
475 __get_user(regs->regs[12], &funcptr->GOT);
477 regs->pc = (unsigned long)ka->sa.sa_handler;
481 pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
482 current->comm, task_pid_nr(current), frame, regs->pc, regs->pr);
484 flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode));
489 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, unsigned int save_r0)
503 /* Are we from a system call? */
504 if (regs->tra >= 0) {
505 /* If so, check system call restarting.. */
506 switch (regs->regs[0]) {
507 case -ERESTART_RESTARTBLOCK:
508 case -ERESTARTNOHAND:
509 no_system_call_restart:
510 regs->regs[0] = -EINTR;
514 if (!(ka->sa.sa_flags & SA_RESTART))
515 goto no_system_call_restart;
517 case -ERESTARTNOINTR:
518 regs->regs[0] = save_r0;
519 regs->pc -= instruction_size(
520 ctrl_inw(regs->pc - 4));
525 /* Set up the stack frame */
526 if (ka->sa.sa_flags & SA_SIGINFO)
527 ret = setup_rt_frame(sig, ka, info, oldset, regs);
529 ret = setup_frame(sig, ka, oldset, regs);
531 if (ka->sa.sa_flags & SA_ONESHOT)
532 ka->sa.sa_handler = SIG_DFL;
535 spin_lock_irq(¤t->sighand->siglock);
536 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
537 if (!(ka->sa.sa_flags & SA_NODEFER))
538 sigaddset(¤t->blocked,sig);
540 spin_unlock_irq(¤t->sighand->siglock);
547 * Note that 'init' is a special process: it doesn't get signals it doesn't
548 * want to handle. Thus you cannot kill init even with a SIGKILL even by
551 * Note that we go through the signals twice: once to check the signals that
552 * the kernel can handle, and then we build all the user-level signal handling
553 * stack-frames in one go after that.
555 static void do_signal(struct pt_regs *regs, unsigned int save_r0)
559 struct k_sigaction ka;
563 * We want the common case to go fast, which
564 * is why we may in certain cases get here from
565 * kernel mode. Just return without doing anything
568 if (!user_mode(regs))
574 if (test_thread_flag(TIF_RESTORE_SIGMASK))
575 oldset = ¤t->saved_sigmask;
577 oldset = ¤t->blocked;
579 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
581 /* Whee! Actually deliver the signal. */
582 if (handle_signal(signr, &ka, &info, oldset,
583 regs, save_r0) == 0) {
584 /* a signal was successfully delivered; the saved
585 * sigmask will have been stored in the signal frame,
586 * and will be restored by sigreturn, so we can simply
587 * clear the TIF_RESTORE_SIGMASK flag */
588 if (test_thread_flag(TIF_RESTORE_SIGMASK))
589 clear_thread_flag(TIF_RESTORE_SIGMASK);
591 tracehook_signal_handler(signr, &info, &ka, regs,
592 test_thread_flag(TIF_SINGLESTEP));
599 /* Did we come from a system call? */
600 if (regs->tra >= 0) {
601 /* Restart the system call - no handlers present */
602 if (regs->regs[0] == -ERESTARTNOHAND ||
603 regs->regs[0] == -ERESTARTSYS ||
604 regs->regs[0] == -ERESTARTNOINTR) {
605 regs->regs[0] = save_r0;
606 regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
607 } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
608 regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
609 regs->regs[3] = __NR_restart_syscall;
613 /* if there's no signal to deliver, we just put the saved sigmask
615 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
616 clear_thread_flag(TIF_RESTORE_SIGMASK);
617 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
621 asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
622 unsigned long thread_info_flags)
624 /* deal with pending signal delivery */
625 if (thread_info_flags & _TIF_SIGPENDING)
626 do_signal(regs, save_r0);
628 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
629 clear_thread_flag(TIF_NOTIFY_RESUME);
630 tracehook_notify_resume(regs);