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setjmp.S revision 1.12 
      1 /*	$NetBSD: setjmp.S,v 1.12 1999/02/13 16:13:49 christos 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	from: @(#)setjmp.s	5.1 (Berkeley) 4/23/90
     39  */
     40 
     41 #include <machine/asm.h>
     42 #if defined(LIBC_SCCS)
     43 	RCSID("$NetBSD: setjmp.S,v 1.12 1999/02/13 16:13:49 christos Exp $")
     44 #endif
     45 
     46 /*
     47  * C library -- _setjmp, _longjmp
     48  *
     49  *	longjmp(a,v)
     50  * will generate a "return(v)" from the last call to
     51  *	setjmp(a)
     52  * by restoring registers from the stack.
     53  * The previous signal state is restored.
     54  */
     55 
     56 ENTRY(setjmp)
     57 
     58 	PIC_PROLOGUE
     59 	pushl	$0
     60 #ifdef PIC
     61 	call	PIC_PLT(_C_LABEL(sigblock))
     62 #else
     63 	call	_C_LABEL(sigblock)
     64 #endif
     65 	addl	$4,%esp
     66 	PIC_EPILOGUE
     67 
     68 	movl	4(%esp),%ecx
     69 	movl	0(%esp),%edx
     70 	movl	%edx, 0(%ecx)
     71 	movl	%ebx, 4(%ecx)
     72 	movl	%esp, 8(%ecx)
     73 	movl	%ebp,12(%ecx)
     74 	movl	%esi,16(%ecx)
     75 	movl	%edi,20(%ecx)
     76 	movl	%eax,24(%ecx)
     77 	xorl	%eax,%eax
     78 	ret
     79 
     80 ENTRY(longjmp)
     81 	movl	4(%esp),%edx
     82 
     83 	PIC_PROLOGUE
     84 	pushl	24(%edx)
     85 #ifdef PIC
     86 	call	PIC_PLT(_C_LABEL(sigsetmask))
     87 #else
     88 	call	_C_LABEL(sigsetmask)
     89 #endif
     90 	addl	$4,%esp
     91 	PIC_EPILOGUE
     92 
     93 	movl	4(%esp),%edx
     94 	movl	8(%esp),%eax
     95 	movl	0(%edx),%ecx
     96 	movl	4(%edx),%ebx
     97 	movl	8(%edx),%esp
     98 	movl	12(%edx),%ebp
     99 	movl	16(%edx),%esi
    100 	movl	20(%edx),%edi
    101 	testl	%eax,%eax
    102 	jnz	1f
    103 	incl	%eax
    104 1:	movl	%ecx,0(%esp)
    105 	ret
    106