linker_phdr.h revision 18a206c81d9743481e364384affd43306911283d 
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
40int
41phdr_table_load(int                fd,
42                Elf32_Addr         phdr_offset,
43                Elf32_Half         phdr_num,
44                void**             phdr_mmap,
45                Elf32_Addr*        phdr_size,
46                const Elf32_Phdr** phdr_table);
47
48void
49phdr_table_unload(void* phdr_mmap, Elf32_Addr phdr_memsize);
50
51Elf32_Addr
52phdr_table_get_load_size(const Elf32_Phdr* phdr_table,
53                         size_t phdr_count);
54
55int
56phdr_table_reserve_memory(const Elf32_Phdr* phdr_table,
57                          size_t phdr_count,
58                          void** load_start,
59                          Elf32_Addr* load_size,
60                          Elf32_Addr* load_bias);
61
62int
63phdr_table_load_segments(const Elf32_Phdr* phdr_table,
64                         int               phdr_count,
65                         Elf32_Addr        load_bias,
66                         int               fd);
67
68int
69phdr_table_protect_segments(const Elf32_Phdr* phdr_table,
70                            int               phdr_count,
71                            Elf32_Addr        load_bias);
72
73int
74phdr_table_unprotect_segments(const Elf32_Phdr* phdr_table,
75                              int               phdr_count,
76                              Elf32_Addr        load_bias);
77
78int
79phdr_table_protect_gnu_relro(const Elf32_Phdr* phdr_table,
80                             int               phdr_count,
81                             Elf32_Addr        load_bias);
82
83const Elf32_Phdr*
84phdr_table_get_loaded_phdr(const Elf32_Phdr*   phdr_table,
85                           int                 phdr_count,
86                           Elf32_Addr          load_bias);
87
88#ifdef ANDROID_ARM_LINKER
89int
90phdr_table_get_arm_exidx(const Elf32_Phdr* phdr_table,
91                         int               phdr_count,
92                         Elf32_Addr        load_bias,
93                         Elf32_Addr**      arm_exidx,
94                         unsigned*         arm_exidix_count);
95#endif
96
97void
98phdr_table_get_dynamic_section(const Elf32_Phdr* phdr_table,
99                               int               phdr_count,
100                               Elf32_Addr        load_bias,
101                               Elf32_Addr**      dynamic,
102                               size_t*           dynamic_count);
103
104#endif /* LINKER_PHDR_H */
105