525 lines
14 KiB
C
525 lines
14 KiB
C
/*
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* arch/v850/kernel/signal.c -- Signal handling
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*
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* Copyright (C) 2001,02,03 NEC Electronics Corporation
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* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
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* Copyright (C) 1999,2000,2002 Niibe Yutaka & Kaz Kojima
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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
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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*
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* This file was derived from the sh version, arch/sh/kernel/signal.c
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*/
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.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/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 <linux/tty.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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#include <asm/pgalloc.h>
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#include <asm/thread_info.h>
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#include <asm/cacheflush.h>
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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, 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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regs->gpr[GPR_RVAL] = -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_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
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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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regs->gpr[GPR_RVAL] = -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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struct pt_regs *regs)
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{
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return do_sigaltstack(uss, uoss, regs->gpr[GPR_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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unsigned long tramp[2]; /* signal trampoline */
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};
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struct rt_sigframe
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{
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struct siginfo info;
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struct ucontext uc;
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unsigned long tramp[2]; /* signal trampoline */
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};
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static int
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restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc, int *rval_p)
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{
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unsigned int err = 0;
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#define COPY(x) err |= __get_user(regs->x, &sc->regs.x)
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COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
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COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
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COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
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COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
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COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
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COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
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COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
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COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
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COPY(pc); COPY(psw);
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COPY(ctpc); COPY(ctpsw); COPY(ctbp);
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#undef COPY
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return err;
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}
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asmlinkage int sys_sigreturn(struct pt_regs *regs)
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{
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struct sigframe *frame = (struct sigframe *)regs->gpr[GPR_SP];
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sigset_t set;
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int rval;
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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, &rval))
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goto badframe;
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return rval;
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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(struct pt_regs *regs)
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{
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struct rt_sigframe *frame = (struct rt_sigframe *)regs->gpr[GPR_SP];
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sigset_t set;
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stack_t st;
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int rval;
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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, &rval))
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goto badframe;
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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, regs->gpr[GPR_SP]);
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return rval;
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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 *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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#define COPY(x) err |= __put_user(regs->x, &sc->regs.x)
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COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
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COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
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COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
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COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
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COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
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COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
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COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
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COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
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COPY(pc); COPY(psw);
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COPY(ctpc); COPY(ctpsw); COPY(ctbp);
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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 *
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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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/* Default to using normal stack */
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unsigned long sp = regs->gpr[GPR_SP];
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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 *)((sp - 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 signal;
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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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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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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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}
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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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regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
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} else {
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/* Note, these encodings are _little endian_! */
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/* addi __NR_sigreturn, r0, r12 */
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err |= __put_user(0x6600 | (__NR_sigreturn << 16),
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frame->tramp + 0);
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/* trap 0 */
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err |= __put_user(0x010007e0,
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frame->tramp + 1);
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regs->gpr[GPR_LP] = (unsigned long)frame->tramp;
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flush_cache_sigtramp (regs->gpr[GPR_LP]);
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}
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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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regs->pc = (v850_reg_t) ka->sa.sa_handler;
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regs->gpr[GPR_SP] = (v850_reg_t)frame;
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/* Signal handler args: */
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regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
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regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->sc;/* arg 1: sigcontext */
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set_fs(USER_DS);
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#if DEBUG_SIG
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printk("SIG deliver (%s:%d): sp=%p pc=%08lx ra=%08lx\n",
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current->comm, current->pid, frame, regs->pc, );
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#endif
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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 signal;
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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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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 |= copy_siginfo_to_user(&frame->info, info);
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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(regs->gpr[GPR_SP]),
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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,
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regs, set->sig[0]);
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err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
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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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regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
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} else {
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/* Note, these encodings are _little endian_! */
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/* addi __NR_sigreturn, r0, r12 */
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err |= __put_user(0x6600 | (__NR_sigreturn << 16),
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frame->tramp + 0);
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/* trap 0 */
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err |= __put_user(0x010007e0,
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frame->tramp + 1);
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regs->gpr[GPR_LP] = (unsigned long)frame->tramp;
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flush_cache_sigtramp (regs->gpr[GPR_LP]);
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}
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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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regs->pc = (v850_reg_t) ka->sa.sa_handler;
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regs->gpr[GPR_SP] = (v850_reg_t)frame;
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/* Signal handler args: */
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regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
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regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->info; /* arg 1: siginfo */
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regs->gpr[GPR_ARG2] = (v850_reg_t)&frame->uc; /* arg 2: ucontext */
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set_fs(USER_DS);
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#if DEBUG_SIG
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printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
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current->comm, current->pid, frame, regs->pc, regs->pr);
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#endif
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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 (PT_REGS_SYSCALL (regs)) {
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/* If so, check system call restarting.. */
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switch (regs->gpr[GPR_RVAL]) {
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case -ERESTART_RESTARTBLOCK:
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current_thread_info()->restart_block.fn =
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do_no_restart_syscall;
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/* fall through */
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case -ERESTARTNOHAND:
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regs->gpr[GPR_RVAL] = -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->gpr[GPR_RVAL] = -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->gpr[12] = PT_REGS_SYSCALL (regs);
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regs->pc -= 4; /* Size of `trap 0' insn. */
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}
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PT_REGS_SET_SYSCALL (regs, 0);
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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
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* want to handle. Thus you cannot kill init even with a SIGKILL even by
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* mistake.
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*
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* Note that we go through the signals twice: once to check the signals that
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* the kernel can handle, and then we build all the user-level signal handling
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* stack-frames in one go after that.
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*/
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int do_signal(struct pt_regs *regs, sigset_t *oldset)
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{
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siginfo_t info;
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int signr;
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struct k_sigaction ka;
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|
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/*
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* We want the common case to go fast, which
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* is why we may in certain cases get here from
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* kernel mode. Just return without doing anything
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* if so.
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*/
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if (!user_mode(regs))
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return 1;
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if (!oldset)
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oldset = ¤t->blocked;
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signr = get_signal_to_deliver(&info, &ka, regs, NULL);
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if (signr > 0) {
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/* Whee! Actually deliver the signal. */
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handle_signal(signr, &info, &ka, oldset, regs);
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return 1;
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}
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/* Did we come from a system call? */
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if (PT_REGS_SYSCALL (regs)) {
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int rval = (int)regs->gpr[GPR_RVAL];
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/* Restart the system call - no handlers present */
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if (rval == -ERESTARTNOHAND
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|| rval == -ERESTARTSYS
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|| rval == -ERESTARTNOINTR)
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{
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regs->gpr[12] = PT_REGS_SYSCALL (regs);
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regs->pc -= 4; /* Size of `trap 0' insn. */
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}
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else if (rval == -ERESTART_RESTARTBLOCK) {
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regs->gpr[12] = __NR_restart_syscall;
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regs->pc -= 4; /* Size of `trap 0' insn. */
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}
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}
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return 0;
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|
}
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