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review.blissroms.org / platform_bionic / 84d0683a824fa02dbaa6d1b56a79223804b54e80 / . / linker / arch / mips64 / begin.S
blob: 8f6b94a43f6837889ac1cb3696c8c896fc8c8ae5 [file] [log] [blame]
Chris Dearman99186652014-02-06 20:36:51 -0800[diff] [blame]1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
Elliott Hughes851e68a2014-02-19 16:53:20 -0800[diff] [blame]29#include <private/bionic_asm.h>
Chris Dearman99186652014-02-06 20:36:51 -0800[diff] [blame]30
31#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
32#define ELF_DYNSZ 8
33#define ELF_DYN_TAG 0
34#define ELF_DYN_VAL 4
35#define GOTENT_SZ 4
36#else
37#define ELF_DYNSZ 16
38#define ELF_DYN_TAG 0
39#define ELF_DYN_VAL 8
40#define GOTENT_SZ 8
41#endif
42
43 .text
44 .align 4
45 .type __start,@function
46
47 .ent __start
48 .globl __start
Dmitriy Ivanov1a5db572014-07-28 17:53:29 -0700[diff] [blame]49 .globl _start
Chris Dearman99186652014-02-06 20:36:51 -0800[diff] [blame]50__start:
Dmitriy Ivanov1a5db572014-07-28 17:53:29 -0700[diff] [blame]51_start:
Chris Dearman99186652014-02-06 20:36:51 -0800[diff] [blame]52 .set noreorder
53 bal 1f
54 nop
551:
56#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
57 .cpload ra
58#else
59 .cpsetup ra, $0, 1b
60#endif
61 .set reorder
62
63 /* Discover the load address */
64 LA t0, 1b
65 PTR_SUBU t0, ra, t0
66
67#define DT_PLTGOT 3
68#define DT_MIPS_LOCAL_GOTNO 0x7000000a
69
70 /* Search dynamic table for DT_MIPS_LOCAL_GOTNO and DT_PLTGOT values */
71 LA t1, _DYNAMIC
72 PTR_ADDU t1, t0
73 LI t3, DT_PLTGOT
74 LI ta0, DT_MIPS_LOCAL_GOTNO
750:
76 REG_L t2, ELF_DYN_TAG(t1)
77 beqz t2, .Lrelocate_local_got
78
79 bne t2, t3, 1f /* DT_PLTGOT? */
80 REG_L s0, ELF_DYN_VAL(t1)
81 PTR_ADDU s0, t0
82 b 2f
83
841:
85 bne t2, ta0, 2f /* DT_MIPS_LOCAL_GOTNO? */
86 REG_L s1, ELF_DYN_VAL(t1)
87
882: PTR_ADDU t1, ELF_DYNSZ
89 b 0b
90
91.Lrelocate_local_got:
92 /*
93 * Relocate the local GOT entries
94 * got[0] is address of lazy resolver function
95 * got[1] may be used for a GNU extension
96 */
97
98 PTR_ADDU s0, GOTENT_SZ
99 SUBU s1, 1
100 PTR_L t1, (s0)
101 bgez t1, 9f
102 PTR_ADDU s0, GOTENT_SZ
103 SUBU s1, 1
104 b 9f
105
1061: PTR_L t1, (s0)
107 PTR_ADDU t1, t0
108 PTR_S t1, (s0)
109 PTR_ADDU s0, GOTENT_SZ
1109: SUBU s1, 1
111 bgez s1, 1b
112
113 /* call linker_init */
114 move a0, sp
115#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
116 PTR_SUBU sp, 4*REGSZ /* space for arg saves in linker_init */
117#endif
118 jal __linker_init
119#if (_MIPS_SIM == _ABIO32) || (_MIPS_SIM == _ABI32)
120 PTR_ADDU sp, 4*REGSZ /* restore sp */
121#endif
122 move t9, v0
123 j t9
124 .end __start