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setjmp.S revision 1.2 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * William Jolitz.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 	.text
     39 	/*.asciz "from: @(#)setjmp.s	5.1 (Berkeley) 4/23/90"*/
     40 	.asciz "$Id: setjmp.S,v 1.2 1993/10/20 18:50:17 jtc Exp $"
     41 #endif /* LIBC_SCCS and not lint */
     42 
     43 /*
     44  * C library -- _setjmp, _longjmp
     45  *
     46  *	longjmp(a,v)
     47  * will generate a "return(v)" from the last call to
     48  *	setjmp(a)
     49  * by restoring registers from the stack.
     50  * The previous signal state is restored.
     51  */
     52 
     53 #include "DEFS.h"
     54 #include "SYS.h"
     55 
     56 ENTRY(setjmp)
     57 	pushl	$0
     58 	call	PIC_PLT(_sigblock)
     59 	popl	%edx
     60 	movl	4(%esp),%ecx
     61 	movl	0(%esp),%edx
     62 	movl	%edx, 0(%ecx)
     63 	movl	%ebx, 4(%ecx)
     64 	movl	%esp, 8(%ecx)
     65 	movl	%ebp,12(%ecx)
     66 	movl	%esi,16(%ecx)
     67 	movl	%edi,20(%ecx)
     68 	movl	%eax,24(%ecx)
     69 	xorl	%eax,%eax
     70 	ret
     71 
     72 ENTRY(longjmp)
     73 	movl	4(%esp),%edx
     74 	pushl	24(%edx)
     75 	call	PIC_PLT(_sigsetmask)
     76 	popl	%eax
     77 	movl	4(%esp),%edx
     78 	movl	8(%esp),%eax
     79 	movl	0(%edx),%ecx
     80 	movl	4(%edx),%ebx
     81 	movl	8(%edx),%esp
     82 	movl	12(%edx),%ebp
     83 	movl	16(%edx),%esi
     84 	movl	20(%edx),%edi
     85 	testl	%eax,%eax
     86 	jnz	1f
     87 	incl	%eax
     88 1:	movl	%ecx,0(%esp)
     89 	ret
     90