summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/powerpc/crt1.S
blob: a97b0d142076dae1bc6aeedb744c3bb04111990a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/*
 * Copyright (C) 2003 by Erik Andersen
 *
 * This program 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.
 *
 * 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 Library General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Library 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
 */

/* Integer registers.  */
#define r0      0
#define r1      1
#define r2      2
#define r3      3
#define r4      4
#define r5      5
#define r6      6
#define r7      7
#define r8      8
#define r9      9
#define r10     10
#define r13     13
#define r31     31

.text
	.globl	_start
	.type	_start,%function
	.type	_init,%function
	.type	_fini,%function
	.type	main,%function
	.type	__uClibc_main,%function

_start:
	mr	r10,r1 	/* Save the stack pointer */
	clrrwi	r1,r1,4	/* Align stack ptr to 16 bytes */
	mr	r9,r1 	/* Pass aligned stack ptr */
#ifdef __PIC__
	bl	_GLOBAL_OFFSET_TABLE_-4@local
	mflr	r31
#endif
	/* Set up an initial stack frame, and clear the LR.  */
	li	r0,0
	stwu	r1,-16(r1)
	mtlr	r0
	stw	r0,0(r1)
	/* find argc from the stack pointer */
	lwz	r4,0(r10)
	/* find argv one word offset from the stack pointer */
	addi	r5,r10,4
	mr	r8,r7 /* Pass _dl_fini from ldso or NULL if statically linked */
	/* Ok, now run uClibc's main() -- shouldn't return */
#ifdef __PIC__
	lwz	r6,_init@got(r31)
	lwz	r7,_fini@got(r31)
	lwz	r3,main@got(r31)
	b	__uClibc_main@plt
#else
	lis     r6,_init@ha	# load top 16 bits
	addi    r6,r6,_init@l	# load bottom 16 bits
	lis     r7,_fini@ha	# load top 16 bits
	addi    r7,r7,_fini@l	# load bottom 16 bits
	lis     r3,main@ha	# load top 16 bits
	addi    r3,r3,main@l	# load bottom 16 bits
	b	__uClibc_main
#endif

.size _start,.-_start

/* Define a symbol for the first piece of initialized data.  */
	.data
	.globl __data_start
__data_start:
	.long 0
	.weak data_start
	data_start = __data_start