1/*	$NetBSD: rtld_start.S,v 1.7 2002/09/12 17:18:38 mycroft Exp $	*/
2
3/*-
4 * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas and by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
33__FBSDID("$FreeBSD$");
34
35	.text
36	.align	0
37	.globl	.rtld_start
38	.type	.rtld_start,%function
39.rtld_start:
40	mov	r6, sp			/* save the stack pointer */
41	bic	sp, sp, #7		/* align the stack pointer */
42	sub	sp, sp, #8		/* make room for obj_main & exit proc */
43	mov	r4, r0			/* save ps_strings */
44	ldr	sl, .L2
45	ldr	r5, .L2+4
46	ldr	r0, .L2+8
47.L1:
48	add	sl, pc, sl
49	ldr	r5, [sl, r5]
50	ldr	r0, [sl, r0]
51
52	sub	r1, sl, r5		/* relocbase */
53	add	r0, r1, r0		/* &_DYNAMIC */
54	bl	_rtld_relocate_nonplt_self
55	mov	r1, sp
56	add	r2, sp, #4
57	mov	r0, r6			/* load the sp the kernel gave us */
58	bl	_rtld			/* call the shared loader */
59	mov	r3, r0			/* save entry point */
60
61	ldr	r2, [sp, #0]		/* r2 = cleanup */
62	ldr	r1, [sp, #4]		/* r1 = obj_main */
63	mov	sp, r6			/* restore stack */
64	mov	r0, r4			/* restore ps_strings */
65	mov	pc, r3			/* jump to the entry point */
66.L2:
67	.word	_GLOBAL_OFFSET_TABLE_ - (.L1+8)
68	.word	_GLOBAL_OFFSET_TABLE_(GOT)
69	.word	_DYNAMIC(GOT)
70
71	.align	0
72	.globl	_rtld_bind_start
73	.type	_rtld_bind_start,%function
74/*
75 *	stack[0] = RA
76 *	ip = &GOT[n+3]
77 *	lr = &GOT[2]
78 */
79_rtld_bind_start:
80	stmdb	sp!,{r0-r5,sl,fp}
81
82	sub	r1, ip, lr		/* r1 = 4 * (n + 1) */
83	sub	r1, r1, #4		/* r1 = 4 * n */
84	add	r1, r1, r1		/* r1 = 8 * n */
85
86	ldr	r0, [lr, #-4]		/* get obj ptr from GOT[1] */
87	mov	r4, ip			/* save GOT location */
88
89	mov	r5, sp			/* Save the stack pointer */
90	bic	sp, sp, #7		/* Align the stack pointer */
91	bl	_rtld_bind		/* Call the binder */
92	mov	sp, r5			/* Restore the old stack pointer */
93
94	str	r0, [r4]		/* save address in GOT */
95	mov	ip, r0			/* save new address */
96
97	ldmia	sp!,{r0-r5,sl,fp,lr}	/* restore the stack */
98	mov	pc, ip			/* jump to the new address */
99
100	.section .note.GNU-stack,"",%progbits
101