xref: /minix3/libexec/ld.elf_so/arch/sparc/rtld_start.S (revision e83f7ba2c93894ce4409c1a9136af3d6d8ad48cf)
1*e83f7ba2SBen Gras/*	$NetBSD: rtld_start.S,v 1.16 2008/04/28 20:23:03 martin Exp $	*/
2*e83f7ba2SBen Gras
3*e83f7ba2SBen Gras/*-
4*e83f7ba2SBen Gras * Copyright (c) 1999, 2002, 2003 The NetBSD Foundation, Inc.
5*e83f7ba2SBen Gras * All rights reserved.
6*e83f7ba2SBen Gras *
7*e83f7ba2SBen Gras * This code is derived from software contributed to The NetBSD Foundation
8*e83f7ba2SBen Gras * by Christos Zoulas, Paul Kranenburg, and by Charles M. Hannum.
9*e83f7ba2SBen Gras *
10*e83f7ba2SBen Gras * Redistribution and use in source and binary forms, with or without
11*e83f7ba2SBen Gras * modification, are permitted provided that the following conditions
12*e83f7ba2SBen Gras * are met:
13*e83f7ba2SBen Gras * 1. Redistributions of source code must retain the above copyright
14*e83f7ba2SBen Gras *    notice, this list of conditions and the following disclaimer.
15*e83f7ba2SBen Gras * 2. Redistributions in binary form must reproduce the above copyright
16*e83f7ba2SBen Gras *    notice, this list of conditions and the following disclaimer in the
17*e83f7ba2SBen Gras *    documentation and/or other materials provided with the distribution.
18*e83f7ba2SBen Gras *
19*e83f7ba2SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20*e83f7ba2SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21*e83f7ba2SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22*e83f7ba2SBen Gras * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23*e83f7ba2SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24*e83f7ba2SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25*e83f7ba2SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26*e83f7ba2SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27*e83f7ba2SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28*e83f7ba2SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29*e83f7ba2SBen Gras * POSSIBILITY OF SUCH DAMAGE.
30*e83f7ba2SBen Gras */
31*e83f7ba2SBen Gras
32*e83f7ba2SBen Gras#include <machine/asm.h>
33*e83f7ba2SBen Gras
34*e83f7ba2SBen Gras	.section	".text"
35*e83f7ba2SBen Gras	.align	4
36*e83f7ba2SBen Gras	.global	_rtld_start
37*e83f7ba2SBen Gras	.type	_rtld_start,@function
38*e83f7ba2SBen Gras_rtld_start:
39*e83f7ba2SBen Gras	mov	0, %fp			/* Erect a fence post for ourselves */
40*e83f7ba2SBen Gras	mov	%g1, %l1		/* save ps_strings */
41*e83f7ba2SBen Gras	sub	%sp, 32+8, %sp		/* room for return args and save area */
42*e83f7ba2SBen Gras
43*e83f7ba2SBen Gras	sethi	%hi(_GLOBAL_OFFSET_TABLE_-4), %l7
44*e83f7ba2SBen Gras	call	0f
45*e83f7ba2SBen Gras	 add	%l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7
46*e83f7ba2SBen Gras	call	_DYNAMIC+8
47*e83f7ba2SBen Gras0:	add	%l7, %o7, %l7		/* real &_GLOBAL_OFFSET_TABLE_ */
48*e83f7ba2SBen Gras	ld	[%o7+8], %o0		/* load stub call instruction */
49*e83f7ba2SBen Gras	ld	[%l7], %l0		/* base-relative &_DYNAMIC */
50*e83f7ba2SBen Gras	sll	%o0, 2, %o0		/* extract PC offset */
51*e83f7ba2SBen Gras
52*e83f7ba2SBen Gras	add	%o0, %o7, %o0		/* real &_DYNAMIC */
53*e83f7ba2SBen Gras	sub	%o0, %l0, %l0		/* relocbase */
54*e83f7ba2SBen Gras	call	_rtld_relocate_nonplt_self
55*e83f7ba2SBen Gras	 mov	%l0, %o1		/* relocbase */
56*e83f7ba2SBen Gras
57*e83f7ba2SBen Gras	mov	%l0, %o1		/* relocbase */
58*e83f7ba2SBen Gras	call	_rtld
59*e83f7ba2SBen Gras	 add	%sp, 96, %o0		/* &argc - 8 */
60*e83f7ba2SBen Gras
61*e83f7ba2SBen Gras	ld	[%sp + 96], %g3	/* arg: cleanup */
62*e83f7ba2SBen Gras	ld	[%sp + 96 + 4], %g2	/* arg: obj */
63*e83f7ba2SBen Gras	add	%sp, 32+8, %sp		/* restore stack pointer */
64*e83f7ba2SBen Gras
65*e83f7ba2SBen Gras	jmp	%o0
66*e83f7ba2SBen Gras	 mov	%l1, %g1		/* restore ps_strings */
67*e83f7ba2SBen Gras
68*e83f7ba2SBen Gras
69*e83f7ba2SBen Gras	.section	".text"
70*e83f7ba2SBen Gras	.align	4
71*e83f7ba2SBen Gras	.global	_rtld_bind_start
72*e83f7ba2SBen Gras	.type	_rtld_bind_start,@function
73*e83f7ba2SBen Gras_rtld_bind_start:	# (obj, reloff)
74*e83f7ba2SBen Gras	ld	[%o7 + 8], %o0		/* obj id is in second PLT slot */
75*e83f7ba2SBen Gras	srl	%g1, 10, %o1		/* offset is in high 22 bits */
76*e83f7ba2SBen Gras	call	_rtld_bind		/* Call _rtld_bind(obj, offset) */
77*e83f7ba2SBen Gras	 sub	%o1, 12*4, %o1		/* first 4 `pltrel' entries missing! */
78*e83f7ba2SBen Gras
79*e83f7ba2SBen Gras	jmp	%o0			/* return value == function address */
80*e83f7ba2SBen Gras	 restore
81*e83f7ba2SBen Gras
82