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setjmp.S revision 1.13 
      1 /*	$NetBSD: setjmp.S,v 1.13 2003/08/07 16:42:07 agc 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 1.13 2003/08/07 16:42:07 agc 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 restored.
     50  */
     51 
     52 ENTRY(setjmp)
     53 
     54 	PIC_PROLOGUE
     55 	pushl	$0
     56 #ifdef PIC
     57 	call	PIC_PLT(_C_LABEL(sigblock))
     58 #else
     59 	call	_C_LABEL(sigblock)
     60 #endif
     61 	addl	$4,%esp
     62 	PIC_EPILOGUE
     63 
     64 	movl	4(%esp),%ecx
     65 	movl	0(%esp),%edx
     66 	movl	%edx, 0(%ecx)
     67 	movl	%ebx, 4(%ecx)
     68 	movl	%esp, 8(%ecx)
     69 	movl	%ebp,12(%ecx)
     70 	movl	%esi,16(%ecx)
     71 	movl	%edi,20(%ecx)
     72 	movl	%eax,24(%ecx)
     73 	xorl	%eax,%eax
     74 	ret
     75 
     76 ENTRY(longjmp)
     77 	movl	4(%esp),%edx
     78 
     79 	PIC_PROLOGUE
     80 	pushl	24(%edx)
     81 #ifdef PIC
     82 	call	PIC_PLT(_C_LABEL(sigsetmask))
     83 #else
     84 	call	_C_LABEL(sigsetmask)
     85 #endif
     86 	addl	$4,%esp
     87 	PIC_EPILOGUE
     88 
     89 	movl	4(%esp),%edx
     90 	movl	8(%esp),%eax
     91 	movl	0(%edx),%ecx
     92 	movl	4(%edx),%ebx
     93 	movl	8(%edx),%esp
     94 	movl	12(%edx),%ebp
     95 	movl	16(%edx),%esi
     96 	movl	20(%edx),%edi
     97 	testl	%eax,%eax
     98 	jnz	1f
     99 	incl	%eax
    100 1:	movl	%ecx,0(%esp)
    101 	ret
    102