xref: /src/lib/libc/arch/arm/sys/getcontext.S

/*	$NetBSD: getcontext.S,v 1.4.16.1 2007/08/28 17:36:31 matt Exp $	*/

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Klaus Klein.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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(SYSLIBC_SCCS) && !defined(lint)
	RCSID("$NetBSD: getcontext.S,v 1.4.16.1 2007/08/28 17:36:31 matt Exp $")
#endif /* SYSLIBC_SCCS && !lint */

#ifdef WEAK_ALIAS
WEAK_ALIAS(getcontext, _getcontext)
#endif

ENTRY(_getcontext)
	mov	r2, r0			/* Must save argument pointer. */
	SYSTRAP(getcontext)
	_SYSCALL_CERROR_CHECK
#ifdef __thumb__
	add	r2, #36
	mov	r0, lr
	str	r0, [r2, #15*4]		/* Adjust PC. */
	mov	r0, #0
	str	r0, [r2, #0*4]		/* Return 0. */
#else
	str	lr, [r2, #(36 + 15*4)]	/* Adjust PC. */
#ifdef SOFTFLOAT
	/* Ahem. */
	/* Judging from the softfloat code we should at least save
	   the exception codes and rounding mode here. */
#endif
	mov	r0, #0
	str	r0, [r2, #(36 + 0*4)]	/* Return 0. */
#endif
	RET
END(_getcontext)