xref: /src/lib/libc/arch/powerpc/sys/__sigtramp2.S

/*	$NetBSD: __sigtramp2.S,v 1.3 2011/01/15 07:31:12 matt Exp $	*/

/*-
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "SYS.h"

#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: __sigtramp2.S,v 1.3 2011/01/15 07:31:12 matt Exp $")
#endif /* LIBC_SCCS && !lint */

/*
 * On entry to user space, stack and registers look like:
 *
 *	r3	signal number
 *	r4	pointer to siginfo structure
 *	r5	pointer to ucontext structure
 *	r30	pointer to ucontext structure
 *	srr0	address of handler
 *	lr	address of this trampoline
 *
 */
ENTRY_NOPROFILE(__sigtramp_siginfo_2)
	mr	%r3,%r30		/* restore ucontext pointer */
	_DOSYSCALL(setcontext)		/* restore machine state */
	_DOSYSCALL(exit)		/* or exit with errno if failed */
END(__sigtramp_siginfo_2)