glibc/sysdeps/i386/__longjmp.S

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/* 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(%ecx), %ebx
movl JB_SI(%ecx), %esi
movl JB_DI(%ecx), %edi
movl JB_BP(%ecx), %ebp
movl JB_SP(%ecx), %esp
/* Jump to saved PC. */
movl JB_PC(%ecx), %ecx
jmp *%ecx