setjmp.s

来自「基于组件方式开发操作系统的OSKIT源代码」· S 代码 · 共 105 行

/*
 * Copyright (c) 1999 University of Utah and the Flux Group.
 * All rights reserved.
 * 
 * This file is part of the Flux OSKit.  The OSKit is free software, also known
 * as "open source;" you can redistribute it and/or modify it under the terms
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF).  To explore alternate licensing terms, contact
 * the University of Utah at [e-mail] or [phone].
 * 
 * The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GPL for more details.  You should have
 * received a copy of the GPL along with the OSKit; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */

/*	$NetBSD: _setjmp.S,v 1.4 1998/08/04 02:03:08 mark Exp $	*/

/*
 * Copyright (c) 1997 Mark Brinicombe
 * All rights reserved.
 *
 * 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 Mark Brinicombe
 * 4. Neither the name of the University 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 AUTHOR 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 AUTHOR 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 <oskit/arm32/asm.h>
#include <oskit/arm32/softfloat.h>

/*
 * C library -- _setjmp, _longjmp
 *
 *	_longjmp(a,v)
 * will generate a "return(v)" from the last call to
 *	_setjmp(a)
 * by restoring registers from the stack.
 * The previous signal state is NOT restored.
 *
 * Note: r0 is the return value
 *       r1-r3 are scratch registers in functions
 */

ENTRY(setjmp)
ENTRY(_setjmp)
#ifdef SOFTFLOAT
	add	r0, r0, #52
#else
	/* Store fp registers */
	sfm	f4, 4, [r0], #48
	/* Store fpsr */
	rfs	r1
	str	r1, [r0], #0x0004
#endif	/* SOFTFLOAT */
	/* Store integer registers */
        stmia	r0, {r4-r14}

        mov	r0, #0x00000000
        mov	r15, r14


ENTRY(longjmp)
ENTRY(_longjmp)
#ifdef SOFTFLOAT
	add	r0, r0, #52
#else
	/* Restore fp registers */
	lfm	f4, 4, [r0], #48
	/* Restore fpsr */
	ldr	r4, [r0], #0x0004
	wfs	r4
#endif	/* SOFTFLOAT */
       	/* Restore integer registers */
        ldmia	r0, {r4-r14}

	/* Set return value */
	mov	r0, r1
	teq	r0, #0x00000000
	moveq	r0, #0x00000001
	mov	r15, r14