2005-04-16 22:20:36 +00:00
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/*
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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/suspend.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 (!on_sig_stack(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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|
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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]
|
|
|
|
: sig);
|
|
|
|
regs->er1 = (unsigned long)&(frame->sc);
|
|
|
|
regs->er5 = current->mm->start_data; /* GOT base */
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
give_sigsegv:
|
|
|
|
force_sigsegv(sig, current);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
|
|
sigset_t *set, struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
struct rt_sigframe *frame;
|
|
|
|
int err = 0;
|
|
|
|
int usig;
|
|
|
|
unsigned char *ret;
|
|
|
|
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
usig = current_thread_info()->exec_domain
|
|
|
|
&& current_thread_info()->exec_domain->signal_invmap
|
|
|
|
&& sig < 32
|
|
|
|
? current_thread_info()->exec_domain->signal_invmap[sig]
|
|
|
|
: sig;
|
|
|
|
|
|
|
|
err |= __put_user(usig, &frame->sig);
|
|
|
|
if (err)
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
err |= __put_user(&frame->info, &frame->pinfo);
|
|
|
|
err |= __put_user(&frame->uc, &frame->puc);
|
|
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
|
|
if (err)
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
/* Create the ucontext. */
|
|
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
|
|
err |= __put_user(0, &frame->uc.uc_link);
|
|
|
|
err |= __put_user((void *)current->sas_ss_sp,
|
|
|
|
&frame->uc.uc_stack.ss_sp);
|
|
|
|
err |= __put_user(sas_ss_flags(rdusp()),
|
|
|
|
&frame->uc.uc_stack.ss_flags);
|
|
|
|
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
|
|
|
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
|
|
|
|
err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
if (err)
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
/* Set up to return from userspace. */
|
|
|
|
ret = frame->retcode;
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER)
|
|
|
|
ret = (unsigned char *)(ka->sa.sa_restorer);
|
|
|
|
else {
|
|
|
|
/* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
|
|
|
|
err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
|
|
|
|
(unsigned long *)(frame->retcode + 0));
|
|
|
|
err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
|
|
|
|
}
|
|
|
|
err |= __put_user(ret, &frame->pretcode);
|
|
|
|
|
|
|
|
if (err)
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
/* Set up registers for signal handler */
|
|
|
|
wrusp ((unsigned long) frame);
|
|
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
|
|
regs->er0 = (current_thread_info()->exec_domain
|
|
|
|
&& current_thread_info()->exec_domain->signal_invmap
|
|
|
|
&& sig < 32
|
|
|
|
? current_thread_info()->exec_domain->signal_invmap[sig]
|
|
|
|
: sig);
|
|
|
|
regs->er1 = (unsigned long)&(frame->info);
|
|
|
|
regs->er2 = (unsigned long)&frame->uc;
|
|
|
|
regs->er5 = current->mm->start_data; /* GOT base */
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
give_sigsegv:
|
|
|
|
force_sigsegv(sig, current);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* OK, we're invoking a handler
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
|
|
|
|
sigset_t *oldset, struct pt_regs * regs)
|
|
|
|
{
|
|
|
|
/* are we from a system call? */
|
|
|
|
if (regs->orig_er0 >= 0) {
|
|
|
|
switch (regs->er0) {
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
|
|
case -ERESTARTNOHAND:
|
|
|
|
regs->er0 = -EINTR;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case -ERESTARTSYS:
|
|
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
|
|
regs->er0 = -EINTR;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/* fallthrough */
|
|
|
|
case -ERESTARTNOINTR:
|
|
|
|
regs->er0 = regs->orig_er0;
|
|
|
|
regs->pc -= 2;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* set up the stack frame */
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
|
|
setup_rt_frame(sig, ka, info, oldset, regs);
|
|
|
|
else
|
|
|
|
setup_frame(sig, ka, oldset, regs);
|
|
|
|
|
[PATCH] convert signal handling of NODEFER to act like other Unix boxes.
It has been reported that the way Linux handles NODEFER for signals is
not consistent with the way other Unix boxes handle it. I've written a
program to test the behavior of how this flag affects signals and had
several reports from people who ran this on various Unix boxes,
confirming that Linux seems to be unique on the way this is handled.
The way NODEFER affects signals on other Unix boxes is as follows:
1) If NODEFER is set, other signals in sa_mask are still blocked.
2) If NODEFER is set and the signal is in sa_mask, then the signal is
still blocked. (Note: this is the behavior of all tested but Linux _and_
NetBSD 2.0 *).
The way NODEFER affects signals on Linux:
1) If NODEFER is set, other signals are _not_ blocked regardless of
sa_mask (Even NetBSD doesn't do this).
2) If NODEFER is set and the signal is in sa_mask, then the signal being
handled is not blocked.
The patch converts signal handling in all current Linux architectures to
the way most Unix boxes work.
Unix boxes that were tested: DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU
3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX.
* NetBSD was the only other Unix to behave like Linux on point #2. The
main concern was brought up by point #1 which even NetBSD isn't like
Linux. So with this patch, we leave NetBSD as the lonely one that
behaves differently here with #2.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-29 15:44:09 +00:00
|
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
2005-04-16 22:20:36 +00:00
|
|
|
sigaddset(¤t->blocked,sig);
|
[PATCH] convert signal handling of NODEFER to act like other Unix boxes.
It has been reported that the way Linux handles NODEFER for signals is
not consistent with the way other Unix boxes handle it. I've written a
program to test the behavior of how this flag affects signals and had
several reports from people who ran this on various Unix boxes,
confirming that Linux seems to be unique on the way this is handled.
The way NODEFER affects signals on other Unix boxes is as follows:
1) If NODEFER is set, other signals in sa_mask are still blocked.
2) If NODEFER is set and the signal is in sa_mask, then the signal is
still blocked. (Note: this is the behavior of all tested but Linux _and_
NetBSD 2.0 *).
The way NODEFER affects signals on Linux:
1) If NODEFER is set, other signals are _not_ blocked regardless of
sa_mask (Even NetBSD doesn't do this).
2) If NODEFER is set and the signal is in sa_mask, then the signal being
handled is not blocked.
The patch converts signal handling in all current Linux architectures to
the way most Unix boxes work.
Unix boxes that were tested: DU4, AIX 5.2, Irix 6.5, NetBSD 2.0, SFU
3.5 on WinXP, AIX 5.3, Mac OSX, and of course Linux 2.6.13-rcX.
* NetBSD was the only other Unix to behave like Linux on point #2. The
main concern was brought up by point #1 which even NetBSD isn't like
Linux. So with this patch, we leave NetBSD as the lonely one that
behaves differently here with #2.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-08-29 15:44:09 +00:00
|
|
|
recalc_sigpending();
|
|
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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;
|
|
|
|
|
2005-06-25 06:13:50 +00:00
|
|
|
if (try_to_freeze())
|
2005-04-16 22:20:36 +00:00
|
|
|
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;
|
|
|
|
}
|