linker_phdr.h revision 12c78bbded8ec03f821dfa09174464c04836e4ea 
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#ifndef LINKER_PHDR_H
29#define LINKER_PHDR_H
30
31/* Declarations related to the ELF program header table and segments.
32 *
33 * The design goal is to provide an API that is as close as possible
34 * to the ELF spec, and does not depend on linker-specific data
35 * structures (e.g. the exact layout of struct soinfo).
36 */
37
38#include "linker.h"
39
40#ifdef __cplusplus
41extern "C" {
42#endif
43
44/* See linker_phdr.c for all usage documentation */
45
46int
47phdr_table_load(int                fd,
48                Elf32_Addr         phdr_offset,
49                Elf32_Half         phdr_num,
50                void**             phdr_mmap,
51                Elf32_Addr*        phdr_size,
52                const Elf32_Phdr** phdr_table);
53
54void
55phdr_table_unload(void* phdr_mmap, Elf32_Addr phdr_memsize);
56
57Elf32_Addr
58phdr_table_get_load_size(const Elf32_Phdr* phdr_table,
59                         size_t phdr_count);
60
61int
62phdr_table_reserve_memory(const Elf32_Phdr* phdr_table,
63                          size_t phdr_count,
64                          void** load_start,
65                          Elf32_Addr* load_size,
66                          Elf32_Addr* load_bias);
67
68int
69phdr_table_load_segments(const Elf32_Phdr* phdr_table,
70                         int               phdr_count,
71                         Elf32_Addr        load_bias,
72                         int               fd);
73
74int
75phdr_table_protect_segments(const Elf32_Phdr* phdr_table,
76                            int               phdr_count,
77                            Elf32_Addr        load_bias);
78
79int
80phdr_table_unprotect_segments(const Elf32_Phdr* phdr_table,
81                              int               phdr_count,
82                              Elf32_Addr        load_bias);
83
84int
85phdr_table_protect_gnu_relro(const Elf32_Phdr* phdr_table,
86                             int               phdr_count,
87                             Elf32_Addr        load_bias);
88
89const Elf32_Phdr*
90phdr_table_get_loaded_phdr(const Elf32_Phdr*   phdr_table,
91                           int                 phdr_count,
92                           Elf32_Addr          load_bias);
93
94#ifdef ANDROID_ARM_LINKER
95int
96phdr_table_get_arm_exidx(const Elf32_Phdr* phdr_table,
97                         int               phdr_count,
98                         Elf32_Addr        load_bias,
99                         Elf32_Addr**      arm_exidx,
100                         unsigned*         arm_exidix_count);
101#endif
102
103void
104phdr_table_get_dynamic_section(const Elf32_Phdr* phdr_table,
105                               int               phdr_count,
106                               Elf32_Addr        load_bias,
107                               Elf32_Addr**      dynamic,
108                               size_t*           dynamic_count);
109
110#ifdef __cplusplus
111};
112#endif
113
114#endif /* LINKER_PHDR_H */
115