crt0_basic.S revision 233545 
1/*-
2 * Copyright (c) 2003-2012 Broadcom Corporation
3 * All Rights Reserved
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in
13 *    the documentation and/or other materials provided with the
14 *    distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
25 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
26 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/mips/nlm/dev/net/ucore/crt0_basic.S 233545 2012-03-27 14:05:12Z jchandra $
29 */
30
31#include <machine/asm.h>
32
33	.text
34	.align	2
35	.globl	_start
36	.ent	_start
37_start:
38	.set	noreorder
39	la	gp, _gp
40	.end 	_start
41
42	.globl	__stack
43
44	.ent	zerobss
45zerobss:
46	la	v0, _fbss
47	la	v1, _end
483:
49	sw	zero, 0(v0)
50	bltu	v0,v1,3b
51	addiu	v0,v0,4			# executed in delay slot
52	la	sp, __stack		# set stack pointer
53	.end	zerobss
54
55	.ent	init
56init:
57	addiu	a1,sp,32		# argv = sp + 32
58	addiu	a2,sp,40		# envp = sp + 40
59	sw	zero,(a1)		# argv[argc] = 0
60	sw	zero,(a2)		# envp[0] = 0
61	jal	main			# call the program start function
62	move	a0,zero			# set argc to 0
631:	b	1b
64	nop
65	.end	init
66
67