e227e8f3ba
The current implementation only handles -ERESTARTNOHAND, whereas we also need to handle -ERESTART_RESTARTBLOCK in the handle_signal() case for restartable system calls. Follows the sh change. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
752 lines
21 KiB
C
752 lines
21 KiB
C
/*
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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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* arch/sh64/kernel/signal.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 Paul Mundt
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* Copyright (C) 2004 Richard Curnow
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*
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* Started from sh version.
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*
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*/
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/personality.h>
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#include <linux/freezer.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/personality.h>
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#include <asm/ucontext.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#define REG_RET 9
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#define REG_ARG1 2
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#define REG_ARG2 3
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#define REG_ARG3 4
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#define REG_SP 15
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#define REG_PR 18
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#define REF_REG_RET regs->regs[REG_RET]
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#define REF_REG_SP regs->regs[REG_SP]
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#define DEREF_REG_PR regs->regs[REG_PR]
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#define DEBUG_SIG 0
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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
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sys_sigsuspend(old_sigset_t mask,
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unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7,
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struct pt_regs * regs)
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{
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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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REF_REG_RET = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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regs->pc += 4; /* because sys_sigreturn decrements the pc */
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if (do_signal(regs, &saveset)) {
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/* pc now points at signal handler. Need to decrement
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it because entry.S will increment it. */
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regs->pc -= 4;
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return -EINTR;
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}
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}
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}
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asmlinkage int
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sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
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unsigned long r4, unsigned long r5, unsigned long r6,
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unsigned long r7,
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struct pt_regs * regs)
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{
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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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REF_REG_RET = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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regs->pc += 4; /* because sys_sigreturn decrements the pc */
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if (do_signal(regs, &saveset)) {
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/* pc now points at signal handler. Need to decrement
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it because entry.S will increment it. */
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regs->pc -= 4;
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return -EINTR;
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}
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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 __user *act,
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struct old_sigaction __user *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 __user *uss, stack_t __user *uoss,
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unsigned long r4, unsigned long r5, unsigned long r6,
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unsigned long r7,
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struct pt_regs * regs)
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{
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return do_sigaltstack(uss, uoss, REF_REG_SP);
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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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struct sigframe
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{
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struct sigcontext sc;
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unsigned long extramask[_NSIG_WORDS-1];
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long long retcode[2];
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};
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struct rt_sigframe
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{
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struct siginfo __user *pinfo;
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void *puc;
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struct siginfo info;
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struct ucontext uc;
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long long retcode[2];
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};
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#ifdef CONFIG_SH_FPU
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static inline int
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restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
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{
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int err = 0;
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int fpvalid;
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err |= __get_user (fpvalid, &sc->sc_fpvalid);
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conditional_used_math(fpvalid);
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if (! fpvalid)
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return err;
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if (current == last_task_used_math) {
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last_task_used_math = NULL;
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regs->sr |= SR_FD;
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}
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err |= __copy_from_user(¤t->thread.fpu.hard, &sc->sc_fpregs[0],
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(sizeof(long long) * 32) + (sizeof(int) * 1));
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return err;
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}
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static inline int
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setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
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{
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int err = 0;
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int fpvalid;
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fpvalid = !!used_math();
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err |= __put_user(fpvalid, &sc->sc_fpvalid);
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if (! fpvalid)
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return err;
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if (current == last_task_used_math) {
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grab_fpu();
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fpsave(¤t->thread.fpu.hard);
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release_fpu();
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last_task_used_math = NULL;
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regs->sr |= SR_FD;
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}
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err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.fpu.hard,
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(sizeof(long long) * 32) + (sizeof(int) * 1));
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clear_used_math();
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return err;
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}
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#else
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static inline int
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restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
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{}
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static inline int
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setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
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{}
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#endif
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static int
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restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p)
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{
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unsigned int err = 0;
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unsigned long long current_sr, new_sr;
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#define SR_MASK 0xffff8cfd
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#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
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COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
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COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
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COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
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COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
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COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
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COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
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COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
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COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
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COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
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COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
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COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
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COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
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COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
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COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
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COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
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COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
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COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
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COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
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/* Prevent the signal handler manipulating SR in a way that can
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crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be
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modified */
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current_sr = regs->sr;
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err |= __get_user(new_sr, &sc->sc_sr);
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regs->sr &= SR_MASK;
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regs->sr |= (new_sr & ~SR_MASK);
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COPY(pc);
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#undef COPY
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/* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr
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* has been restored above.) */
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err |= restore_sigcontext_fpu(regs, sc);
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regs->syscall_nr = -1; /* disable syscall checks */
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err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]);
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return err;
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}
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asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
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unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7,
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struct pt_regs * regs)
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{
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struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP;
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sigset_t set;
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long long ret;
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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.oldmask)
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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, &ret))
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goto badframe;
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regs->pc -= 4;
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return (int) ret;
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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 sys_rt_sigreturn(unsigned long r2, unsigned long r3,
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unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7,
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struct pt_regs * regs)
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{
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struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP;
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sigset_t set;
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stack_t __user st;
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long long ret;
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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_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->uc.uc_mcontext, &ret))
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goto badframe;
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regs->pc -= 4;
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if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
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goto badframe;
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/* It is more difficult to avoid calling this function than to
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call it and ignore errors. */
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do_sigaltstack(&st, NULL, REF_REG_SP);
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return (int) ret;
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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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/*
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* Set up a signal frame.
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*/
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static int
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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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/* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */
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err |= setup_sigcontext_fpu(regs, sc);
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#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
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COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
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COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
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COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
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COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
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COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
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COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
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COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
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COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
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COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
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COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
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COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
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COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
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COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
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COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
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COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
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COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
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COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
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COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
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COPY(sr); COPY(pc);
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#undef COPY
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err |= __put_user(mask, &sc->oldmask);
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return err;
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}
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/*
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* Determine which stack to use..
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*/
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static inline void __user *
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get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
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{
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if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
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sp = current->sas_ss_sp + current->sas_ss_size;
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return (void __user *)((sp - frame_size) & -8ul);
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}
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void sa_default_restorer(void); /* See comments below */
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void sa_default_rt_restorer(void); /* See comments below */
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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 __user *frame;
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int err = 0;
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int signal;
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frame = get_sigframe(ka, regs->regs[REG_SP], 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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signal = 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 |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
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/* Give up earlier as i386, in case */
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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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/* Give up earlier as i386, in case */
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if (err)
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goto give_sigsegv;
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ka->sa.sa_flags & SA_RESTORER) {
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DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
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/*
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* On SH5 all edited pointers are subject to NEFF
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*/
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DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
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(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
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} else {
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/*
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* Different approach on SH5.
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* . Endianness independent asm code gets placed in entry.S .
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* This is limited to four ASM instructions corresponding
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* to two long longs in size.
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* . err checking is done on the else branch only
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* . flush_icache_range() is called upon __put_user() only
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* . all edited pointers are subject to NEFF
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* . being code, linker turns ShMedia bit on, always
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* dereference index -1.
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*/
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DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
|
|
DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
|
|
(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
|
|
|
|
if (__copy_to_user(frame->retcode,
|
|
(unsigned long long)sa_default_restorer & (~1), 16) != 0)
|
|
goto give_sigsegv;
|
|
|
|
/* Cohere the trampoline with the I-cache. */
|
|
flush_cache_sigtramp(DEREF_REG_PR-1, DEREF_REG_PR-1+16);
|
|
}
|
|
|
|
/*
|
|
* Set up registers for signal handler.
|
|
* All edited pointers are subject to NEFF.
|
|
*/
|
|
regs->regs[REG_SP] = (unsigned long) frame;
|
|
regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
|
|
(regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
|
|
regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
|
|
|
|
/* FIXME:
|
|
The glibc profiling support for SH-5 needs to be passed a sigcontext
|
|
so it can retrieve the PC. At some point during 2003 the glibc
|
|
support was changed to receive the sigcontext through the 2nd
|
|
argument, but there are still versions of libc.so in use that use
|
|
the 3rd argument. Until libc.so is stabilised, pass the sigcontext
|
|
through both 2nd and 3rd arguments.
|
|
*/
|
|
|
|
regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
|
|
regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
|
|
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
|
|
|
|
set_fs(USER_DS);
|
|
|
|
#if DEBUG_SIG
|
|
/* Broken %016Lx */
|
|
printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
|
|
signal,
|
|
current->comm, current->pid, frame,
|
|
regs->pc >> 32, regs->pc & 0xffffffff,
|
|
DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
|
|
#endif
|
|
|
|
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 __user *frame;
|
|
int err = 0;
|
|
int signal;
|
|
|
|
frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
goto give_sigsegv;
|
|
|
|
signal = 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(&frame->info, &frame->pinfo);
|
|
err |= __put_user(&frame->uc, &frame->puc);
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
|
|
/* Give up earlier as i386, in case */
|
|
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(regs->regs[REG_SP]),
|
|
&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));
|
|
|
|
/* Give up earlier as i386, in case */
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
already in userspace. */
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
|
|
|
|
/*
|
|
* On SH5 all edited pointers are subject to NEFF
|
|
*/
|
|
DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
|
|
(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
|
|
} else {
|
|
/*
|
|
* Different approach on SH5.
|
|
* . Endianness independent asm code gets placed in entry.S .
|
|
* This is limited to four ASM instructions corresponding
|
|
* to two long longs in size.
|
|
* . err checking is done on the else branch only
|
|
* . flush_icache_range() is called upon __put_user() only
|
|
* . all edited pointers are subject to NEFF
|
|
* . being code, linker turns ShMedia bit on, always
|
|
* dereference index -1.
|
|
*/
|
|
|
|
DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
|
|
DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
|
|
(DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
|
|
|
|
if (__copy_to_user(frame->retcode,
|
|
(unsigned long long)sa_default_rt_restorer & (~1), 16) != 0)
|
|
goto give_sigsegv;
|
|
|
|
flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
|
|
}
|
|
|
|
/*
|
|
* Set up registers for signal handler.
|
|
* All edited pointers are subject to NEFF.
|
|
*/
|
|
regs->regs[REG_SP] = (unsigned long) frame;
|
|
regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
|
|
(regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
|
|
regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
|
|
regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
|
|
regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
|
|
|
|
set_fs(USER_DS);
|
|
|
|
#if DEBUG_SIG
|
|
/* Broken %016Lx */
|
|
printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
|
|
signal,
|
|
current->comm, current->pid, frame,
|
|
regs->pc >> 32, regs->pc & 0xffffffff,
|
|
DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
|
|
#endif
|
|
|
|
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->syscall_nr >= 0) {
|
|
/* If so, check system call restarting.. */
|
|
switch (regs->regs[REG_RET]) {
|
|
case -ERESTART_RESTARTBLOCK:
|
|
case -ERESTARTNOHAND:
|
|
regs->regs[REG_RET] = -EINTR;
|
|
break;
|
|
|
|
case -ERESTARTSYS:
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
regs->regs[REG_RET] = -EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case -ERESTARTNOINTR:
|
|
/* Decode syscall # */
|
|
regs->regs[REG_RET] = regs->syscall_nr;
|
|
regs->pc -= 4;
|
|
}
|
|
}
|
|
|
|
/* 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);
|
|
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
|
sigaddset(¤t->blocked,sig);
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Note that we go through the signals twice: once to check the signals that
|
|
* the kernel can handle, and then we build all the user-level signal handling
|
|
* stack-frames in one go after that.
|
|
*/
|
|
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 (!user_mode(regs))
|
|
return 1;
|
|
|
|
if (try_to_freeze())
|
|
goto no_signal;
|
|
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
oldset = ¤t->saved_sigmask;
|
|
else if (!oldset)
|
|
oldset = ¤t->blocked;
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, 0);
|
|
|
|
if (signr > 0) {
|
|
/* Whee! Actually deliver the signal. */
|
|
handle_signal(signr, &info, &ka, oldset, regs);
|
|
|
|
/*
|
|
* If a signal was successfully delivered, the saved sigmask
|
|
* is in its frame, and we can clear the TIF_RESTORE_SIGMASK
|
|
* flag.
|
|
*/
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK))
|
|
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
|
|
|
return 1;
|
|
}
|
|
|
|
no_signal:
|
|
/* Did we come from a system call? */
|
|
if (regs->syscall_nr >= 0) {
|
|
/* Restart the system call - no handlers present */
|
|
switch (regs->regs[REG_RET]) {
|
|
case -ERESTARTNOHAND:
|
|
case -ERESTARTSYS:
|
|
case -ERESTARTNOINTR:
|
|
/* Decode Syscall # */
|
|
regs->regs[REG_RET] = regs->syscall_nr;
|
|
regs->pc -= 4;
|
|
break;
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
regs->regs[REG_RET] = __NR_restart_syscall;
|
|
regs->pc -= 4;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* No signal to deliver -- put the saved sigmask back */
|
|
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
|
|
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
|
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|