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