path: root/arch/m68k/kernel/signal.c

/*
 *  linux/arch/m68k/kernel/signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/*
 * Linux/m68k support by Hamish Macdonald
 *
 * 68060 fixes by Jesper Skov
 *
 * 1997-12-01  Modified for POSIX.1b signals by Andreas Schwab
 *
 * mathemu support by Roman Zippel
 *  (Note: fpstate in the signal context is completely ignored for the emulator
 *         and the internal floating point format is put on stack)
 */

/*
 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
 * Atari :-) Current limitation: Only one sigstack can be active at one time.
 * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
 * signal handlers!
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/highuid.h>
#include <linux/personality.h>
#include <linux/tty.h>
#include <linux/binfmts.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/traps.h>
#include <asm/ucontext.h>

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);

const int frame_extra_sizes[16] = {
  [1]	= -1, /* sizeof(((struct frame *)0)->un.fmt1), */
  [2]	= sizeof(((struct frame *)0)->un.fmt2),
  [3]	= sizeof(((struct frame *)0)->un.fmt3),
  [4]	= sizeof(((struct frame *)0)->un.fmt4),
  [5]	= -1, /* sizeof(((struct frame *)0)->un.fmt5), */
  [6]	= -1, /* sizeof(((struct frame *)0)->un.fmt6), */
  [7]	= sizeof(((struct frame *)0)->un.fmt7),
  [8]	= -1, /* sizeof(((struct frame *)0)->un.fmt8), */
  [9]	= sizeof(((struct frame *)0)->un.fmt9),
  [10]	= sizeof(((struct frame *)0)->un.fmta),
  [11]	= sizeof(((struct frame *)0)->un.fmtb),
  [12]	= -1, /* sizeof(((struct frame *)0)->un.fmtc), */
  [13]	= -1, /* sizeof(((struct frame *)0)->un.fmtd), */
  [14]	= -1, /* sizeof(((struct frame *)0)->un.fmte), */
  [15]	= -1, /* sizeof(((struct frame *)0)->un.fmtf), */
};

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
asmlinkage int do_sigsuspend(struct pt_regs *regs)
{
	old_sigset_t mask = regs->d3;
	sigset_t saveset;

	mask &= _BLOCKABLE;
	saveset = current->blocked;
	siginitset(&current->blocked, mask);
	recalc_sigpending();

	regs->d0 = -EINTR;
	while (1) {
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		if (do_signal(&saveset, regs))
			return -EINTR;
	}
}

asmlinkage int
do_rt_sigsuspend(struct pt_regs *regs)
{
	sigset_t *unewset = (sigset_t *)regs->d1;
	size_t sigsetsize = (size_t)regs->d2;
	sigset_t saveset, newset;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	if (copy_from_user(&newset, unewset, sizeof(newset)))
		return -EFAULT;
	sigdelsetmask(&newset, ~_BLOCKABLE);

	saveset = current->blocked;
	current->blocked = newset;
	recalc_sigpending();

	regs->d0 = -EINTR;
	while (1) {
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		if (do_signal(&saveset, regs))
			return -EINTR;
	}
}

asmlinkage int
sys_sigaction(int sig, const struct old_sigaction *act,
	      struct old_sigaction *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	if (act) {
		old_sigset_t mask;
		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
			return -EFAULT;
		__get_user(new_ka.sa.sa_flags, &act->sa_flags);