glibc/sysdeps/i386/__longjmp.S

/* longjmp for i386.
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <sysdep.h>
#define _ASM
#include <jmp_buf.h>

ENTRY (__longjmp)
	movl 4(%esp), %ecx	/* User's jmp_buf in %ecx.  */
	movl 8(%esp), %eax	/* Second argument is return value.  */
     	/* Restore registers.  */
	movl (JB_BX*4)(%ecx), %ebx
	movl (JB_SI*4)(%ecx), %esi
	movl (JB_DI*4)(%ecx), %edi
	movl (JB_BP*4)(%ecx), %ebp
	movl (JB_SP*4)(%ecx), %esp
	/* Jump to saved PC.  */
     	movl (JB_PC*4)(%ecx), %ecx
     	jmp *%ecx