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_setjmp.S revision 1.9 
      1 /*	$NetBSD: _setjmp.S,v 1.9 2014/05/23 02:34:19 uebayasi Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	from: @(#)_setjmp.s	5.1 (Berkeley) 4/23/90
     35  */
     36 
     37 #include <machine/asm.h>
     38 #if defined(LIBC_SCCS)
     39 	RCSID("$NetBSD: _setjmp.S,v 1.9 2014/05/23 02:34:19 uebayasi Exp $")
     40 #endif
     41 
     42 /*
     43  * C library -- _setjmp, _longjmp
     44  *
     45  *	_longjmp(a,v)
     46  * will generate a "return(v)" from the last call to
     47  *	_setjmp(a)
     48  * by restoring registers from the stack.
     49  * The previous signal state is NOT restored.
     50  */
     51 
     52 ENTRY(_setjmp)
     53 	movl	4(%esp),%eax
     54 	movl	0(%esp),%edx
     55 	movl	%edx, 0(%eax)		/* rta */
     56 	movl	%ebx, 4(%eax)
     57 	movl	%esp, 8(%eax)
     58 	movl	%ebp,12(%eax)
     59 	movl	%esi,16(%eax)
     60 	movl	%edi,20(%eax)
     61 	xorl	%eax,%eax
     62 	ret
     63 END(_setjmp)
     64 
     65 ENTRY(_longjmp)
     66 	movl	4(%esp),%edx
     67 	movl	8(%esp),%eax
     68 	movl	0(%edx),%ecx
     69 	movl	4(%edx),%ebx
     70 	movl	8(%edx),%esp
     71 	movl	12(%edx),%ebp
     72 	movl	16(%edx),%esi
     73 	movl	20(%edx),%edi
     74 	testl	%eax,%eax
     75 	jnz	1f
     76 	incl	%eax
     77 1:	movl	%ecx,0(%esp)
     78 	ret
     79 END(_longjmp)
     80