1 /* $NetBSD: rtld_start.S,v 1.16 2008/04/28 20:23:03 martin Exp $ */
4 * Copyright (c) 1999, 2002, 2003 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas, Paul Kranenburg, and by Charles M. Hannum.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
32 #include <machine/asm.h>
37 .type _rtld_start,@function
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 */
43 sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %l7
45 add %l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7
47 0: 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 */
52 add %o0, %o7, %o0 /* real &_DYNAMIC */
53 sub %o0, %l0, %l0 /* relocbase */
54 call _rtld_relocate_nonplt_self
55 mov %l0, %o1 /* relocbase */
57 mov %l0, %o1 /* relocbase */
59 add %sp, 96, %o0 /* &argc - 8 */
61 ld [%sp + 96], %g3 /* arg: cleanup */
62 ld [%sp + 96 + 4], %g2 /* arg: obj */
63 add %sp, 32+8, %sp /* restore stack pointer */
66 mov %l1, %g1 /* restore ps_strings */
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! */
79 jmp %o0 /* return value == function address */