200 lines
6.5 KiB
C
200 lines
6.5 KiB
C
/* $Id: elf32.h $ */
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/** @file
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* IPRT - ELF 32-bit header.
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*/
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/*
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* Copyright (C) 2010-2023 Oracle and/or its affiliates.
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*
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* This file is part of VirtualBox base platform packages, as
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* available from https://www.virtualbox.org.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, in version 3 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses>.
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*
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* The contents of this file may alternatively be used under the terms
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* of the Common Development and Distribution License Version 1.0
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* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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* in the VirtualBox distribution, in which case the provisions of the
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* CDDL are applicable instead of those of the GPL.
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*
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* You may elect to license modified versions of this file under the
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* terms and conditions of either the GPL or the CDDL or both.
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*
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* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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*/
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#ifndef IPRT_INCLUDED_formats_elf32_h
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#define IPRT_INCLUDED_formats_elf32_h
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#ifndef RT_WITHOUT_PRAGMA_ONCE
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# pragma once
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#endif
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#include <iprt/assertcompile.h>
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#include "elf-common.h"
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/*
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* ELF 32 standard types.
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*/
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typedef uint32_t Elf32_Addr;
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typedef uint16_t Elf32_Half;
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typedef uint32_t Elf32_Off;
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typedef int32_t Elf32_Sword;
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typedef uint32_t Elf32_Word;
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/*
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* Ensure type size correctness in accordance to .
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* Portable Format Specification (for ELF), Version 1.1, fig 1-2. .
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*/
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AssertCompileSize(Elf32_Addr, 4);
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AssertCompileSize(Elf32_Half, 2);
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AssertCompileSize(Elf32_Off, 4);
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AssertCompileSize(Elf32_Sword, 4);
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AssertCompileSize(Elf32_Word, 4);
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/*
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* ELF 32 non-standard types for convenience.
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*/
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typedef Elf32_Word Elf32_Size;
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typedef Elf32_Word Elf32_Hashelt;
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/*
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* ELF header.
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*/
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typedef struct
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{
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unsigned char e_ident[16]; /* ELF identification. */
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Elf32_Half e_type; /* Object file type. */
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Elf32_Half e_machine; /* Machine type. */
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Elf32_Word e_version; /* Object file version. */
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Elf32_Addr e_entry; /* Entry point address. */
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Elf32_Off e_phoff; /* Program header offset. */
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Elf32_Off e_shoff; /* Section header offset. */
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Elf32_Word e_flags; /* Processor-specific flags. */
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Elf32_Half e_ehsize; /* ELF header size. */
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Elf32_Half e_phentsize; /* Size of program header entries. */
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Elf32_Half e_phnum; /* Number of program headers. */
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Elf32_Half e_shentsize; /* Size of section header entries. */
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Elf32_Half e_shnum; /* Number of section headers. */
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Elf32_Half e_shstrndx; /* Section name string table index. */
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} Elf32_Ehdr;
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/*
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* Section header.
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*/
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typedef struct
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{
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Elf32_Word sh_name; /* Section name. */
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Elf32_Word sh_type; /* Section type. */
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Elf32_Word sh_flags; /* Section attributes. */
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Elf32_Addr sh_addr; /* Virtual address in memory. */
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Elf32_Off sh_offset; /* Offset in file. */
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Elf32_Word sh_size; /* Size of section. */
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Elf32_Word sh_link; /* Link to other section. */
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Elf32_Word sh_info; /* Miscellaneous information. */
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Elf32_Word sh_addralign; /* Address alignment boundary. */
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Elf32_Word sh_entsize; /* Size of entries, if section has table. */
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} Elf32_Shdr;
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/*
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* Program header.
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*/
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typedef struct
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{
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Elf32_Word p_type; /* Type of segment. */
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Elf32_Off p_offset; /* Offset in file. */
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Elf32_Addr p_vaddr; /* Virtual address in memory. */
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Elf32_Addr p_paddr; /* Physical address (reserved). */
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Elf32_Word p_filesz; /* Size of segment in file. */
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Elf32_Word p_memsz; /* Size of segment in memory. */
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Elf32_Word p_flags; /* Segment attributes. */
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Elf32_Word p_align; /* Alignment of segment. */
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} Elf32_Phdr;
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/*
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* Note header.
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*/
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typedef struct
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{
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Elf32_Word n_namesz; /* Length of note's name. */
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Elf32_Word n_descsz; /* Length of note's description. */
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Elf32_Word n_type; /* Type of note. */
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} Elf32_Nhdr;
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/*
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* Symbol table entry.
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*/
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typedef struct
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{
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Elf32_Word st_name; /* Symbol name. */
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Elf32_Addr st_value; /* Symbol value. */
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Elf32_Word st_size; /* Size associated with symbol. */
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unsigned char st_info; /* Type and binding attributes. */
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unsigned char st_other; /* Reserved. */
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Elf32_Half st_shndx; /* Section header table index. */
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} Elf32_Sym;
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/*
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* Relocations.
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*/
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typedef struct
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{
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Elf32_Addr r_offset; /* Location to be relocated. */
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Elf32_Word r_info; /* Symbol index and type of relocation. */
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} Elf32_Rel;
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typedef struct
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{
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Elf32_Addr r_offset; /* Location to be relocated. */
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Elf32_Word r_info; /* Symbol index and type of relocation. */
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Elf32_Sword r_addend; /* Constant part of expression. */
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} Elf32_Rela;
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/*
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* Dynamic section entry.
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* ".dynamic" section contains an array of this.
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*/
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typedef struct
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{
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Elf32_Sword d_tag; /* Type of entry. */
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union
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{
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Elf32_Word d_val; /* Integer value. */
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Elf32_Addr d_ptr; /* Virtual address value. */
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} d_un;
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} Elf32_Dyn;
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/*
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* Helper macros.
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*/
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/** The symbol's type. */
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#define ELF32_ST_TYPE(info) ((info) & 0xF)
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/** The symbol's binding. */
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#define ELF32_ST_BIND(info) ((info) >> 4)
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/** Make st_info. given binding and type. */
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#define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
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/** Relocation type. */
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#define ELF32_R_TYPE(info) ((unsigned char)(info))
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/** Relocation symbol index. */
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#define ELF32_R_SYM(info) ((info) >> 8)
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/** Make r_info given the symbol index and type. */
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#define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
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#endif /* !IPRT_INCLUDED_formats_elf32_h */
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