Source to osfmk/i386/_setjmp.s

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/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
 * All Rights Reserved.
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/*
 */

/*
 * 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.
 *
 */

#include <i386/asm.h>

ENTRY(_setjmp)
	movl	4(%esp),%ecx		# fetch buffer
	movl	%ebx,0(%ecx)
	movl	%esi,4(%ecx)
	movl	%edi,8(%ecx)
	movl	%ebp,12(%ecx)		# save frame pointer of caller
	popl	%edx
	movl	%esp,16(%ecx)		# save stack pointer of caller
	movl	%edx,20(%ecx)		# save pc of caller
	xorl	%eax,%eax
        jmp     *%edx

ENTRY(_longjmp)
	movl	8(%esp),%eax		# return(v)
	movl	4(%esp),%ecx		# fetch buffer
	movl	0(%ecx),%ebx
	movl	4(%ecx),%esi
	movl	8(%ecx),%edi
	movl	12(%ecx),%ebp
	movl	16(%ecx),%esp
	orl	%eax,%eax
	jnz	0f
	incl	%eax
0:	jmp	*20(%ecx)		# done, return....