1/*	$NetBSD: rtld_start.S,v 1.15 2003/03/01 15:14:59 mycroft Exp $	*/
2
3/*-
4 * Copyright (c) 1999, 2002, 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas, Paul Kranenburg, 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
34	.section	".text"
35	.align	4
36	.global	_rtld_start
37	.type	_rtld_start,@function
38_rtld_start:
39	mov	0, %fp			/* Erect a fence post for ourselves */
40	mov	%g1, %l1		/* save ps_strings */
41	sub	%sp, 32+8, %sp		/* room for return args and save area */
42
43	sethi	%hi(_GLOBAL_OFFSET_TABLE_-4), %l7
44	call	0f
45	 add	%l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7
46	call	_DYNAMIC+8
470:	add	%l7, %o7, %l7		/* real &_GLOBAL_OFFSET_TABLE_ */
48	ld	[%o7+8], %o0		/* load stub call instruction */
49	ld	[%l7], %l0		/* base-relative &_DYNAMIC */
50	sll	%o0, 2, %o0		/* extract PC offset */
51
52	add	%o0, %o7, %o0		/* real &_DYNAMIC */
53	sub	%o0, %l0, %l0		/* relocbase */
54	call	_rtld_relocate_nonplt_self
55	 mov	%l0, %o1		/* relocbase */
56
57	mov	%l0, %o1		/* relocbase */
58	call	_rtld
59	 add	%sp, 96, %o0		/* &argc - 8 */
60
61	ld	[%sp + 96], %g3	/* arg: cleanup */
62	ld	[%sp + 96 + 4], %g2	/* arg: obj */
63	add	%sp, 32+8, %sp		/* restore stack pointer */
64
65	jmp	%o0
66	 mov	%l1, %g1		/* restore ps_strings */
67
68
69	.section	".text"
70	.align	4
71	.global	_rtld_bind_start
72	.type	_rtld_bind_start,@function
73_rtld_bind_start:	# (obj, reloff)
74	ld	[%o7 + 8], %o0		/* obj id is in second PLT slot */
75	srl	%g1, 10, %o1		/* offset is in high 22 bits */
76	call	_rtld_bind		/* Call _rtld_bind(obj, offset) */
77	 sub	%o1, 12*4, %o1		/* first 4 `pltrel' entries missing! */
78
79	jmp	%o0			/* return value == function address */
80	 restore
81
82