2008-02-08 12:19:31 +00:00
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/* MN10300 Signal handling
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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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/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/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/tty.h>
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#include <linux/personality.h>
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#include <linux/suspend.h>
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2009-06-11 12:08:37 +00:00
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#include <linux/tracehook.h>
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2008-02-08 12:19:31 +00:00
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#include <asm/cacheflush.h>
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#include <asm/ucontext.h>
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#include <asm/uaccess.h>
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#include <asm/fpu.h>
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#include "sigframe.h"
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#define DEBUG_SIG 0
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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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 long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
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{
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2012-05-22 01:42:32 +00:00
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sigset_t blocked;
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siginitset(&blocked, mask);
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return sigsuspend(&blocked);
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2008-02-08 12:19:31 +00:00
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}
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/*
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* set signal action syscall
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*/
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asmlinkage long sys_sigaction(int sig,
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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 (verify_area(VERIFY_READ, act, sizeof(*act)) ||
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__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
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2010-09-26 18:29:12 +00:00
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__get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
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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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2008-02-08 12:19:31 +00:00
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return -EFAULT;
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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 (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
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__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
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2010-09-26 18:29:12 +00:00
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__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
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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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2008-02-08 12:19:31 +00:00
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return -EFAULT;
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}
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return ret;
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}
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/*
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* set alternate signal stack syscall
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*/
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asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss)
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{
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2010-10-27 16:29:01 +00:00
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return do_sigaltstack(uss, uoss, current_frame()->sp);
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2008-02-08 12:19:31 +00:00
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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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static int restore_sigcontext(struct pt_regs *regs,
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struct sigcontext __user *sc, long *_d0)
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{
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unsigned int err = 0;
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2010-09-26 18:28:52 +00:00
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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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2008-02-08 12:19:31 +00:00
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if (is_using_fpu(current))
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fpu_kill_state(current);
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#define COPY(x) err |= __get_user(regs->x, &sc->x)
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COPY(d1); COPY(d2); COPY(d3);
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COPY(a0); COPY(a1); COPY(a2); COPY(a3);
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COPY(e0); COPY(e1); COPY(e2); COPY(e3);
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COPY(e4); COPY(e5); COPY(e6); COPY(e7);
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COPY(lar); COPY(lir);
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COPY(mdr); COPY(mdrq);
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COPY(mcvf); COPY(mcrl); COPY(mcrh);
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COPY(sp); COPY(pc);
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#undef COPY
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{
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unsigned int tmpflags;
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#ifndef CONFIG_MN10300_USING_JTAG
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#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
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EPSW_T | EPSW_nAR)
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#else
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#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
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EPSW_nAR)
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#endif
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err |= __get_user(tmpflags, &sc->epsw);
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regs->epsw = (regs->epsw & ~USER_EPSW) |
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(tmpflags & USER_EPSW);
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regs->orig_d0 = -1; /* disable syscall checks */
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}
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{
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struct fpucontext *buf;
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err |= __get_user(buf, &sc->fpucontext);
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if (buf) {
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if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
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goto badframe;
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err |= fpu_restore_sigcontext(buf);
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}
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}
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err |= __get_user(*_d0, &sc->d0);
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return err;
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badframe:
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return 1;
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}
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/*
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* standard signal return syscall
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*/
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asmlinkage long sys_sigreturn(void)
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{
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2010-10-27 16:29:01 +00:00
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struct sigframe __user *frame;
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2008-02-08 12:19:31 +00:00
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sigset_t set;
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long d0;
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2010-10-27 16:29:01 +00:00
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frame = (struct sigframe __user *) current_frame()->sp;
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2008-02-08 12:19:31 +00:00
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if (verify_area(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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goto badframe;
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if (_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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2012-05-11 00:57:59 +00:00
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set_current_blocked(&set);
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2008-02-08 12:19:31 +00:00
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2010-10-27 16:29:01 +00:00
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if (restore_sigcontext(current_frame(), &frame->sc, &d0))
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2008-02-08 12:19:31 +00:00
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goto badframe;
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return d0;
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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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* realtime signal return syscall
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*/
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asmlinkage long sys_rt_sigreturn(void)
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{
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2010-10-27 16:29:01 +00:00
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struct rt_sigframe __user *frame;
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2008-02-08 12:19:31 +00:00
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sigset_t set;
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2010-10-27 16:29:01 +00:00
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long d0;
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2008-02-08 12:19:31 +00:00
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2010-10-27 16:29:01 +00:00
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frame = (struct rt_sigframe __user *) current_frame()->sp;
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2008-02-08 12:19:31 +00:00
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if (verify_area(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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2012-05-11 00:57:59 +00:00
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set_current_blocked(&set);
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2008-02-08 12:19:31 +00:00
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2010-10-27 16:29:01 +00:00
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if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
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2008-02-08 12:19:31 +00:00
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goto badframe;
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2010-10-27 16:29:01 +00:00
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if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
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-EFAULT)
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2008-02-08 12:19:31 +00:00
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goto badframe;
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return d0;
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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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* store the userspace context into a signal frame
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*/
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static int setup_sigcontext(struct sigcontext __user *sc,
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struct fpucontext *fpuctx,
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struct pt_regs *regs,
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unsigned long mask)
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{
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int tmp, err = 0;
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#define COPY(x) err |= __put_user(regs->x, &sc->x)
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COPY(d0); COPY(d1); COPY(d2); COPY(d3);
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COPY(a0); COPY(a1); COPY(a2); COPY(a3);
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COPY(e0); COPY(e1); COPY(e2); COPY(e3);
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COPY(e4); COPY(e5); COPY(e6); COPY(e7);
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COPY(lar); COPY(lir);
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COPY(mdr); COPY(mdrq);
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COPY(mcvf); COPY(mcrl); COPY(mcrh);
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COPY(sp); COPY(epsw); COPY(pc);
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#undef COPY
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tmp = fpu_setup_sigcontext(fpuctx);
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if (tmp < 0)
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err = 1;
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else
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err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);
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/* non-iBCS2 extensions.. */
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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 *get_sigframe(struct k_sigaction *ka,
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struct pt_regs *regs,
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size_t frame_size)
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{
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unsigned long sp;
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/* default to using normal stack */
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sp = regs->sp;
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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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2010-01-08 22:43:14 +00:00
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if (sas_ss_flags(sp) == 0)
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2008-02-08 12:19:31 +00:00
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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return (void __user *) ((sp - frame_size) & ~7UL);
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}
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/*
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* set up a normal signal frame
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*/
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static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
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struct pt_regs *regs)
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{
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struct sigframe __user *frame;
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int rsig;
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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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rsig = sig;
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if (sig < 32 &&
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current_thread_info()->exec_domain &&
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current_thread_info()->exec_domain->signal_invmap)
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rsig = current_thread_info()->exec_domain->signal_invmap[sig];
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if (__put_user(rsig, &frame->sig) < 0 ||
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__put_user(&frame->sc, &frame->psc) < 0)
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goto give_sigsegv;
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if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0]))
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goto give_sigsegv;
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if (_NSIG_WORDS > 1) {
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if (__copy_to_user(frame->extramask, &set->sig[1],
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sizeof(frame->extramask)))
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goto give_sigsegv;
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}
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/* set up to return from userspace. If provided, use a stub already in
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* userspace */
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if (ka->sa.sa_flags & SA_RESTORER) {
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if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
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goto give_sigsegv;
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} else {
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if (__put_user((void (*)(void))frame->retcode,
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&frame->pretcode))
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goto give_sigsegv;
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/* this is mov $,d0; syscall 0 */
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if (__put_user(0x2c, (char *)(frame->retcode + 0)) ||
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__put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) ||
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__put_user(0x00, (char *)(frame->retcode + 2)) ||
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__put_user(0xf0, (char *)(frame->retcode + 3)) ||
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__put_user(0xe0, (char *)(frame->retcode + 4)))
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goto give_sigsegv;
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flush_icache_range((unsigned long) frame->retcode,
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(unsigned long) frame->retcode + 5);
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}
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/* set up registers for signal handler */
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regs->sp = (unsigned long) frame;
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regs->pc = (unsigned long) ka->sa.sa_handler;
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regs->d0 = sig;
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regs->d1 = (unsigned long) &frame->sc;
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/* the tracer may want to single-step inside the handler */
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if (test_thread_flag(TIF_SINGLESTEP))
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ptrace_notify(SIGTRAP);
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#if DEBUG_SIG
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printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
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|
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sig, current->comm, current->pid, frame, regs->pc,
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frame->pretcode);
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#endif
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return 0;
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give_sigsegv:
|
2010-09-26 18:28:32 +00:00
|
|
|
force_sigsegv(sig, current);
|
2008-02-08 12:19:31 +00:00
|
|
|
return -EFAULT;
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|
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}
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/*
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|
|
|
* set up a realtime signal frame
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|
|
|
*/
|
|
|
|
static int 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 rsig;
|
|
|
|
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
rsig = sig;
|
|
|
|
if (sig < 32 &&
|
|
|
|
current_thread_info()->exec_domain &&
|
|
|
|
current_thread_info()->exec_domain->signal_invmap)
|
|
|
|
rsig = current_thread_info()->exec_domain->signal_invmap[sig];
|
|
|
|
|
|
|
|
if (__put_user(rsig, &frame->sig) ||
|
|
|
|
__put_user(&frame->info, &frame->pinfo) ||
|
|
|
|
__put_user(&frame->uc, &frame->puc) ||
|
|
|
|
copy_siginfo_to_user(&frame->info, info))
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
/* create the ucontext. */
|
|
|
|
if (__put_user(0, &frame->uc.uc_flags) ||
|
|
|
|
__put_user(0, &frame->uc.uc_link) ||
|
|
|
|
__put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
|
|
|
|
__put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
|
|
|
|
__put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
|
|
|
|
setup_sigcontext(&frame->uc.uc_mcontext,
|
|
|
|
&frame->fpuctx, regs, set->sig[0]) ||
|
|
|
|
__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
/* set up to return from userspace. If provided, use a stub already in
|
|
|
|
* userspace */
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
|
|
if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
|
|
|
|
goto give_sigsegv;
|
|
|
|
} else {
|
|
|
|
if (__put_user((void(*)(void))frame->retcode,
|
|
|
|
&frame->pretcode) ||
|
|
|
|
/* This is mov $,d0; syscall 0 */
|
|
|
|
__put_user(0x2c, (char *)(frame->retcode + 0)) ||
|
|
|
|
__put_user(__NR_rt_sigreturn,
|
|
|
|
(char *)(frame->retcode + 1)) ||
|
|
|
|
__put_user(0x00, (char *)(frame->retcode + 2)) ||
|
|
|
|
__put_user(0xf0, (char *)(frame->retcode + 3)) ||
|
|
|
|
__put_user(0xe0, (char *)(frame->retcode + 4)))
|
|
|
|
goto give_sigsegv;
|
|
|
|
|
|
|
|
flush_icache_range((u_long) frame->retcode,
|
|
|
|
(u_long) frame->retcode + 5);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set up registers for signal handler */
|
|
|
|
regs->sp = (unsigned long) frame;
|
|
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
|
|
regs->d0 = sig;
|
|
|
|
regs->d1 = (long) &frame->info;
|
|
|
|
|
|
|
|
/* the tracer may want to single-step inside the handler */
|
|
|
|
if (test_thread_flag(TIF_SINGLESTEP))
|
|
|
|
ptrace_notify(SIGTRAP);
|
|
|
|
|
|
|
|
#if DEBUG_SIG
|
|
|
|
printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
|
|
|
|
sig, current->comm, current->pid, frame, regs->pc,
|
|
|
|
frame->pretcode);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
give_sigsegv:
|
2010-09-26 18:28:32 +00:00
|
|
|
force_sigsegv(sig, current);
|
2008-02-08 12:19:31 +00:00
|
|
|
return -EFAULT;
|
|
|
|
}
|
|
|
|
|
2010-09-26 18:28:42 +00:00
|
|
|
static inline void stepback(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
regs->pc -= 2;
|
|
|
|
regs->orig_d0 = -1;
|
|
|
|
}
|
|
|
|
|
2008-02-08 12:19:31 +00:00
|
|
|
/*
|
|
|
|
* handle the actual delivery of a signal to userspace
|
|
|
|
*/
|
|
|
|
static int handle_signal(int sig,
|
|
|
|
siginfo_t *info, struct k_sigaction *ka,
|
2012-05-02 13:59:21 +00:00
|
|
|
struct pt_regs *regs)
|
2008-02-08 12:19:31 +00:00
|
|
|
{
|
2012-05-02 13:59:21 +00:00
|
|
|
sigset_t *oldset = sigmask_to_save();
|
2008-02-08 12:19:31 +00:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
/* Are we from a system call? */
|
|
|
|
if (regs->orig_d0 >= 0) {
|
|
|
|
/* If so, check system call restarting.. */
|
|
|
|
switch (regs->d0) {
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
|
|
case -ERESTARTNOHAND:
|
|
|
|
regs->d0 = -EINTR;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case -ERESTARTSYS:
|
|
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
|
|
regs->d0 = -EINTR;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* fallthrough */
|
|
|
|
case -ERESTARTNOINTR:
|
|
|
|
regs->d0 = regs->orig_d0;
|
2010-09-26 18:28:42 +00:00
|
|
|
stepback(regs);
|
2008-02-08 12:19:31 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set up the stack frame */
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
|
|
ret = setup_rt_frame(sig, ka, info, oldset, regs);
|
|
|
|
else
|
|
|
|
ret = setup_frame(sig, ka, oldset, regs);
|
2012-05-22 03:42:15 +00:00
|
|
|
if (ret)
|
|
|
|
return;
|
2008-02-08 12:19:31 +00:00
|
|
|
|
2012-05-22 03:42:15 +00:00
|
|
|
block_sigmask(ka, sig);
|
|
|
|
tracehook_signal_handler(sig, info, ka, regs,
|
|
|
|
test_thread_flag(TIF_SINGLESTEP));
|
2008-02-08 12:19:31 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* handle a potential signal
|
|
|
|
*/
|
|
|
|
static void do_signal(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
struct k_sigaction ka;
|
|
|
|
siginfo_t info;
|
|
|
|
int signr;
|
|
|
|
|
|
|
|
/* we want the common case to go fast, which is why we may in certain
|
|
|
|
* cases get here from kernel mode */
|
|
|
|
if (!user_mode(regs))
|
|
|
|
return;
|
|
|
|
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
|
|
if (signr > 0) {
|
2012-05-02 13:59:21 +00:00
|
|
|
if (handle_signal(signr, &info, &ka, regs) == 0) {
|
2008-02-08 12:19:31 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* did we come from a system call? */
|
|
|
|
if (regs->orig_d0 >= 0) {
|
|
|
|
/* restart the system call - no handlers present */
|
|
|
|
switch (regs->d0) {
|
|
|
|
case -ERESTARTNOHAND:
|
|
|
|
case -ERESTARTSYS:
|
|
|
|
case -ERESTARTNOINTR:
|
|
|
|
regs->d0 = regs->orig_d0;
|
2010-09-26 18:28:42 +00:00
|
|
|
stepback(regs);
|
2008-02-08 12:19:31 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
|
|
regs->d0 = __NR_restart_syscall;
|
2010-09-26 18:28:42 +00:00
|
|
|
stepback(regs);
|
2008-02-08 12:19:31 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* if there's no signal to deliver, we just put the saved sigmask
|
|
|
|
* back */
|
2012-05-22 03:33:55 +00:00
|
|
|
restore_saved_sigmask();
|
2008-02-08 12:19:31 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* notification of userspace execution resumption
|
|
|
|
* - triggered by current->work.notify_resume
|
|
|
|
*/
|
|
|
|
asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
|
|
|
|
{
|
|
|
|
/* Pending single-step? */
|
|
|
|
if (thread_info_flags & _TIF_SINGLESTEP) {
|
|
|
|
#ifndef CONFIG_MN10300_USING_JTAG
|
|
|
|
regs->epsw |= EPSW_T;
|
|
|
|
clear_thread_flag(TIF_SINGLESTEP);
|
|
|
|
#else
|
|
|
|
BUG(); /* no h/w single-step if using JTAG unit */
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/* deal with pending signal delivery */
|
|
|
|
if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
|
|
|
|
do_signal(regs);
|
2009-06-11 12:08:37 +00:00
|
|
|
|
|
|
|
if (thread_info_flags & _TIF_NOTIFY_RESUME) {
|
|
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
2010-10-27 16:29:01 +00:00
|
|
|
tracehook_notify_resume(current_frame());
|
2009-06-11 12:08:37 +00:00
|
|
|
}
|
2008-02-08 12:19:31 +00:00
|
|
|
}
|