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source: vbox/trunk/include/iprt/formats/elf32.h@ 103224

Last change on this file since 103224 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

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1/* $Id: elf32.h 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - ELF 32-bit header.
4 */
5
6/*
7 * Copyright (C) 2010-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37#ifndef IPRT_INCLUDED_formats_elf32_h
38#define IPRT_INCLUDED_formats_elf32_h
39#ifndef RT_WITHOUT_PRAGMA_ONCE
40# pragma once
41#endif
42
43#include <iprt/assertcompile.h>
44#include "elf-common.h"
45
46/*
47 * ELF 32 standard types.
48 */
49typedef uint32_t Elf32_Addr;
50typedef uint16_t Elf32_Half;
51typedef uint32_t Elf32_Off;
52typedef int32_t Elf32_Sword;
53typedef uint32_t Elf32_Word;
54
55/*
56 * Ensure type size correctness in accordance to .
57 * Portable Format Specification (for ELF), Version 1.1, fig 1-2. .
58 */
59AssertCompileSize(Elf32_Addr, 4);
60AssertCompileSize(Elf32_Half, 2);
61AssertCompileSize(Elf32_Off, 4);
62AssertCompileSize(Elf32_Sword, 4);
63AssertCompileSize(Elf32_Word, 4);
64
65/*
66 * ELF 32 non-standard types for convenience.
67 */
68typedef Elf32_Word Elf32_Size;
69typedef Elf32_Word Elf32_Hashelt;
70
71/*
72 * ELF header.
73 */
74typedef struct
75{
76 unsigned char e_ident[16]; /* ELF identification. */
77 Elf32_Half e_type; /* Object file type. */
78 Elf32_Half e_machine; /* Machine type. */
79 Elf32_Word e_version; /* Object file version. */
80 Elf32_Addr e_entry; /* Entry point address. */
81 Elf32_Off e_phoff; /* Program header offset. */
82 Elf32_Off e_shoff; /* Section header offset. */
83 Elf32_Word e_flags; /* Processor-specific flags. */
84 Elf32_Half e_ehsize; /* ELF header size. */
85 Elf32_Half e_phentsize; /* Size of program header entries. */
86 Elf32_Half e_phnum; /* Number of program headers. */
87 Elf32_Half e_shentsize; /* Size of section header entries. */
88 Elf32_Half e_shnum; /* Number of section headers. */
89 Elf32_Half e_shstrndx; /* Section name string table index. */
90} Elf32_Ehdr;
91
92/*
93 * Section header.
94 */
95typedef struct
96{
97 Elf32_Word sh_name; /* Section name. */
98 Elf32_Word sh_type; /* Section type. */
99 Elf32_Word sh_flags; /* Section attributes. */
100 Elf32_Addr sh_addr; /* Virtual address in memory. */
101 Elf32_Off sh_offset; /* Offset in file. */
102 Elf32_Word sh_size; /* Size of section. */
103 Elf32_Word sh_link; /* Link to other section. */
104 Elf32_Word sh_info; /* Miscellaneous information. */
105 Elf32_Word sh_addralign; /* Address alignment boundary. */
106 Elf32_Word sh_entsize; /* Size of entries, if section has table. */
107} Elf32_Shdr;
108
109
110/*
111 * Program header.
112 */
113typedef struct
114{
115 Elf32_Word p_type; /* Type of segment. */
116 Elf32_Off p_offset; /* Offset in file. */
117 Elf32_Addr p_vaddr; /* Virtual address in memory. */
118 Elf32_Addr p_paddr; /* Physical address (reserved). */
119 Elf32_Word p_filesz; /* Size of segment in file. */
120 Elf32_Word p_memsz; /* Size of segment in memory. */
121 Elf32_Word p_flags; /* Segment attributes. */
122 Elf32_Word p_align; /* Alignment of segment. */
123} Elf32_Phdr;
124
125
126/*
127 * Note header.
128 */
129typedef struct
130{
131 Elf32_Word n_namesz; /* Length of note's name. */
132 Elf32_Word n_descsz; /* Length of note's description. */
133 Elf32_Word n_type; /* Type of note. */
134} Elf32_Nhdr;
135
136
137/*
138 * Symbol table entry.
139 */
140typedef struct
141{
142 Elf32_Word st_name; /* Symbol name. */
143 Elf32_Addr st_value; /* Symbol value. */
144 Elf32_Word st_size; /* Size associated with symbol. */
145 unsigned char st_info; /* Type and binding attributes. */
146 unsigned char st_other; /* Reserved. */
147 Elf32_Half st_shndx; /* Section header table index. */
148} Elf32_Sym;
149
150
151/*
152 * Relocations.
153 */
154typedef struct
155{
156 Elf32_Addr r_offset; /* Location to be relocated. */
157 Elf32_Word r_info; /* Symbol index and type of relocation. */
158} Elf32_Rel;
159
160typedef struct
161{
162 Elf32_Addr r_offset; /* Location to be relocated. */
163 Elf32_Word r_info; /* Symbol index and type of relocation. */
164 Elf32_Sword r_addend; /* Constant part of expression. */
165} Elf32_Rela;
166
167/*
168 * Dynamic section entry.
169 * ".dynamic" section contains an array of this.
170 */
171typedef struct
172{
173 Elf32_Sword d_tag; /* Type of entry. */
174 union
175 {
176 Elf32_Word d_val; /* Integer value. */
177 Elf32_Addr d_ptr; /* Virtual address value. */
178 } d_un;
179} Elf32_Dyn;
180
181/*
182 * Helper macros.
183 */
184/** The symbol's type. */
185#define ELF32_ST_TYPE(info) ((info) & 0xF)
186/** The symbol's binding. */
187#define ELF32_ST_BIND(info) ((info) >> 4)
188/** Make st_info. given binding and type. */
189#define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
190
191/** Relocation type. */
192#define ELF32_R_TYPE(info) ((unsigned char)(info))
193/** Relocation symbol index. */
194#define ELF32_R_SYM(info) ((info) >> 8)
195/** Make r_info given the symbol index and type. */
196#define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
197
198
199#endif /* !IPRT_INCLUDED_formats_elf32_h */
200
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