![Yoshinori Sato](/assets/img/avatar_default.png)
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
556 lines
14 KiB
C
556 lines
14 KiB
C
/*
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* linux/arch/h8300/kernel/signal.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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/*
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* uClinux H8/300 support by Yoshinori Sato <ysato@users.sourceforge.jp>
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* and David McCullough <davidm@snapgear.com>
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*
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* Based on
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* Linux/m68k by Hamish Macdonald
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*/
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/*
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* ++roman (07/09/96): implemented signal stacks (specially for tosemu on
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* Atari :-) Current limitation: Only one sigstack can be active at one time.
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* If a second signal with SA_ONSTACK set arrives while working on a sigstack,
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* SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
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* signal handlers!
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/highuid.h>
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#include <linux/personality.h>
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#include <linux/tty.h>
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#include <linux/binfmts.h>
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#include <linux/freezer.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/traps.h>
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#include <asm/ucontext.h>
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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asmlinkage int do_sigsuspend(struct pt_regs *regs)
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{
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old_sigset_t mask = regs->er3;
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sigset_t saveset;
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mask &= _BLOCKABLE;
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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siginitset(¤t->blocked, mask);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs->er0 = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal(regs, &saveset))
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return -EINTR;
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}
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}
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asmlinkage int
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do_rt_sigsuspend(struct pt_regs *regs)
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{
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sigset_t *unewset = (sigset_t *)regs->er1;
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size_t sigsetsize = (size_t)regs->er2;
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sigset_t saveset, newset;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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if (copy_from_user(&newset, unewset, sizeof(newset)))
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return -EFAULT;
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs->er0 = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal(regs, &saveset))
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return -EINTR;
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}
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}
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asmlinkage int
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sys_sigaction(int sig, const struct old_sigaction *act,
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struct old_sigaction *oact)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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if (act) {
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old_sigset_t mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
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__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
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__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
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return -EFAULT;
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__get_user(new_ka.sa.sa_flags, &act->sa_flags);
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__get_user(mask, &act->sa_mask);
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siginitset(&new_ka.sa.sa_mask, mask);
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
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__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
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__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
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return -EFAULT;
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__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
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}
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return ret;
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}
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asmlinkage int
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sys_sigaltstack(const stack_t *uss, stack_t *uoss)
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{
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return do_sigaltstack(uss, uoss, rdusp());
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}
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/*
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* Do a signal return; undo the signal stack.
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*
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* Keep the return code on the stack quadword aligned!
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* That makes the cache flush below easier.
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*/
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struct sigframe
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{
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long dummy_er0;
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long dummy_vector;
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#if defined(CONFIG_CPU_H8S)
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short dummy_exr;
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#endif
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long dummy_pc;
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char *pretcode;
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unsigned char retcode[8];
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unsigned long extramask[_NSIG_WORDS-1];
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struct sigcontext sc;
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int sig;
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} __attribute__((aligned(2),packed));
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struct rt_sigframe
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{
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long dummy_er0;
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long dummy_vector;
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#if defined(CONFIG_CPU_H8S)
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short dummy_exr;
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#endif
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long dummy_pc;
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char *pretcode;
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struct siginfo *pinfo;
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void *puc;
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unsigned char retcode[8];
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struct siginfo info;
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struct ucontext uc;
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int sig;
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} __attribute__((aligned(2),packed));
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static inline int
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restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc,
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int *pd0)
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{
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int err = 0;
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unsigned int ccr;
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unsigned int usp;
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unsigned int er0;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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#define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
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COPY(er1);
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COPY(er2);
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COPY(er3);
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COPY(er5);
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COPY(pc);
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ccr = regs->ccr & 0x10;
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COPY(ccr);
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#undef COPY
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regs->ccr &= 0xef;
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regs->ccr |= ccr;
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regs->orig_er0 = -1; /* disable syscall checks */
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err |= __get_user(usp, &usc->sc_usp);
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wrusp(usp);
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err |= __get_user(er0, &usc->sc_er0);
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*pd0 = er0;
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return err;
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}
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asmlinkage int do_sigreturn(unsigned long __unused,...)
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{
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struct pt_regs *regs = (struct pt_regs *) (&__unused - 1);
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unsigned long usp = rdusp();
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struct sigframe *frame = (struct sigframe *)(usp - 4);
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sigset_t set;
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int er0;
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
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(_NSIG_WORDS > 1 &&
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__copy_from_user(&set.sig[1], &frame->extramask,
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sizeof(frame->extramask))))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (restore_sigcontext(regs, &frame->sc, &er0))
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goto badframe;
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return er0;
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
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{
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struct pt_regs *regs = (struct pt_regs *) &__unused;
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unsigned long usp = rdusp();
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struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
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sigset_t set;
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int er0;
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_unlock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_lock_irq(¤t->sighand->siglock);
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if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
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goto badframe;
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if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
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goto badframe;
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return er0;
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
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unsigned long mask)
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{
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int err = 0;
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err |= __put_user(regs->er0, &sc->sc_er0);
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err |= __put_user(regs->er1, &sc->sc_er1);
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err |= __put_user(regs->er2, &sc->sc_er2);
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err |= __put_user(regs->er3, &sc->sc_er3);
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err |= __put_user(regs->er4, &sc->sc_er4);
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err |= __put_user(regs->er5, &sc->sc_er5);
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err |= __put_user(regs->er6, &sc->sc_er6);
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err |= __put_user(rdusp(), &sc->sc_usp);
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err |= __put_user(regs->pc, &sc->sc_pc);
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err |= __put_user(regs->ccr, &sc->sc_ccr);
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err |= __put_user(mask, &sc->sc_mask);
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return err;
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}
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static inline void *
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get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
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{
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unsigned long usp;
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/* Default to using normal stack. */
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usp = rdusp();
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (!sas_ss_flags(usp))
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usp = current->sas_ss_sp + current->sas_ss_size;
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}
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return (void *)((usp - frame_size) & -8UL);
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}
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static void setup_frame (int sig, struct k_sigaction *ka,
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sigset_t *set, struct pt_regs *regs)
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{
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struct sigframe *frame;
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int err = 0;
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int usig;
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unsigned char *ret;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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usig = current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig;
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err |= __put_user(usig, &frame->sig);
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if (err)
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goto give_sigsegv;
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err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
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if (err)
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goto give_sigsegv;
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if (_NSIG_WORDS > 1) {
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err |= copy_to_user(frame->extramask, &set->sig[1],
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sizeof(frame->extramask));
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if (err)
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goto give_sigsegv;
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}
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ret = frame->retcode;
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if (ka->sa.sa_flags & SA_RESTORER)
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ret = (unsigned char *)(ka->sa.sa_restorer);
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else {
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/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
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err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
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(unsigned long *)(frame->retcode + 0));
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err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
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}
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/* Set up to return from userspace. */
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err |= __put_user(ret, &frame->pretcode);
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if (err)
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goto give_sigsegv;
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/* Set up registers for signal handler */
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wrusp ((unsigned long) frame);
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->er0 = (current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig);
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regs->er1 = (unsigned long)&(frame->sc);
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regs->er5 = current->mm->start_data; /* GOT base */
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return;
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give_sigsegv:
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force_sigsegv(sig, current);
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}
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static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
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sigset_t *set, struct pt_regs *regs)
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{
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struct rt_sigframe *frame;
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int err = 0;
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int usig;
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unsigned char *ret;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto give_sigsegv;
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usig = current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig;
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err |= __put_user(usig, &frame->sig);
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if (err)
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goto give_sigsegv;
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err |= __put_user(&frame->info, &frame->pinfo);
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err |= __put_user(&frame->uc, &frame->puc);
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err |= copy_siginfo_to_user(&frame->info, info);
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if (err)
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goto give_sigsegv;
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/* Create the ucontext. */
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err |= __put_user(0, &frame->uc.uc_flags);
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err |= __put_user(0, &frame->uc.uc_link);
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err |= __put_user((void *)current->sas_ss_sp,
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&frame->uc.uc_stack.ss_sp);
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err |= __put_user(sas_ss_flags(rdusp()),
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&frame->uc.uc_stack.ss_flags);
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err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
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err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
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err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
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if (err)
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goto give_sigsegv;
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/* Set up to return from userspace. */
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ret = frame->retcode;
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if (ka->sa.sa_flags & SA_RESTORER)
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ret = (unsigned char *)(ka->sa.sa_restorer);
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else {
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/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
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err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
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(unsigned long *)(frame->retcode + 0));
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err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
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}
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err |= __put_user(ret, &frame->pretcode);
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if (err)
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goto give_sigsegv;
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/* Set up registers for signal handler */
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wrusp ((unsigned long) frame);
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->er0 = (current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig);
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regs->er1 = (unsigned long)&(frame->info);
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regs->er2 = (unsigned long)&frame->uc;
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regs->er5 = current->mm->start_data; /* GOT base */
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return;
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give_sigsegv:
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force_sigsegv(sig, current);
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}
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/*
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* OK, we're invoking a handler
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*/
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static void
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handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
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sigset_t *oldset, struct pt_regs * regs)
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{
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/* are we from a system call? */
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if (regs->orig_er0 >= 0) {
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switch (regs->er0) {
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case -ERESTART_RESTARTBLOCK:
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case -ERESTARTNOHAND:
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regs->er0 = -EINTR;
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break;
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case -ERESTARTSYS:
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if (!(ka->sa.sa_flags & SA_RESTART)) {
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regs->er0 = -EINTR;
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break;
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}
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/* fallthrough */
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case -ERESTARTNOINTR:
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regs->er0 = regs->orig_er0;
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regs->pc -= 2;
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}
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}
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/* set up the stack frame */
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if (ka->sa.sa_flags & SA_SIGINFO)
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setup_rt_frame(sig, ka, info, oldset, regs);
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else
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setup_frame(sig, ka, oldset, regs);
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spin_lock_irq(¤t->sighand->siglock);
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sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
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if (!(ka->sa.sa_flags & SA_NODEFER))
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sigaddset(¤t->blocked,sig);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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}
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/*
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* Note that 'init' is a special process: it doesn't get signals it doesn't
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
|
* mistake.
|
|
*/
|
|
asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset)
|
|
{
|
|
siginfo_t info;
|
|
int signr;
|
|
struct k_sigaction ka;
|
|
|
|
/*
|
|
* We want the common case to go fast, which
|
|
* is why we may in certain cases get here from
|
|
* kernel mode. Just return without doing anything
|
|
* if so.
|
|
*/
|
|
if ((regs->ccr & 0x10))
|
|
return 1;
|
|
|
|
if (try_to_freeze())
|
|
goto no_signal;
|
|
|
|
current->thread.esp0 = (unsigned long) regs;
|
|
|
|
if (!oldset)
|
|
oldset = ¤t->blocked;
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
if (signr > 0) {
|
|
/* Whee! Actually deliver the signal. */
|
|
handle_signal(signr, &info, &ka, oldset, regs);
|
|
return 1;
|
|
}
|
|
no_signal:
|
|
/* Did we come from a system call? */
|
|
if (regs->orig_er0 >= 0) {
|
|
/* Restart the system call - no handlers present */
|
|
if (regs->er0 == -ERESTARTNOHAND ||
|
|
regs->er0 == -ERESTARTSYS ||
|
|
regs->er0 == -ERESTARTNOINTR) {
|
|
regs->er0 = regs->orig_er0;
|
|
regs->pc -= 2;
|
|
}
|
|
if (regs->er0 == -ERESTART_RESTARTBLOCK){
|
|
regs->er0 = __NR_restart_syscall;
|
|
regs->pc -= 2;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
|
|
{
|
|
if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
|
|
do_signal(regs, NULL);
|
|
}
|