crt0.s

来自「一个非常优秀的操作系统源代码」· S 代码 · 共 52 行

/* Gemini Nucleus
 *
 * $Id: crt0.S,v 1.1.1.1 2000/11/12 19:26:33 guidoj Exp $
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *    
 * This program 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 General Public License for more details.
 *    
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 
 */

	.text
	.globl	_start
_start:
	movl	$_crt0_stack,%esp 
	movl	$_crt0_prolog,%eax
	movl	$_crt0_epilog,%ebx
	int	$0x42	
	call	main
	
_crt0_halt:
	jmp	_crt0_halt

	.align	4
_crt0_prolog:
	movl	_crt0_saved_sp, %esp
	popf
	popal
	ret
	
	.align	4
_crt0_epilog:
	pushal
	pushf
	movl	%esp, _crt0_saved_sp
	int	$0x41

	.globl	_crt0_saved_sp
	.data
	.space	512
_crt0_stack:
_crt0_saved_sp:
	.long	0