| 1 | /*-
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| 2 | * Copyright (c) 1996-1998 John D. Polstra.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | *
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 24 | * SUCH DAMAGE.
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| 25 | */
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| 26 |
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| 27 | #ifndef ___internal_ldrELF32_h
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| 28 | #define ___internal_ldrELF32_h
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| 29 |
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| 30 | #include "ldrELFCommon.h"
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| 31 |
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| 32 | /*
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| 33 | * ELF definitions common to all 32-bit architectures.
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| 34 | */
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| 35 |
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| 36 | typedef uint32_t Elf32_Addr;
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| 37 | typedef uint16_t Elf32_Half;
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| 38 | typedef uint32_t Elf32_Off;
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| 39 | typedef int32_t Elf32_Sword;
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| 40 | typedef uint32_t Elf32_Word;
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| 41 | typedef uint32_t Elf32_Size;
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| 42 | typedef Elf32_Off Elf32_Hashelt;
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| 43 |
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| 44 | /*
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| 45 | * ELF header.
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| 46 | */
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| 47 |
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| 48 | typedef struct Elf32_Ehdr {
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| 49 | unsigned char e_ident[EI_NIDENT]; /* File identification. */
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| 50 | Elf32_Half e_type; /* File type. */
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| 51 | Elf32_Half e_machine; /* Machine architecture. */
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| 52 | Elf32_Word e_version; /* ELF format version. */
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| 53 | Elf32_Addr e_entry; /* Entry point. */
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| 54 | Elf32_Off e_phoff; /* Program header file offset. */
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| 55 | Elf32_Off e_shoff; /* Section header file offset. */
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| 56 | Elf32_Word e_flags; /* Architecture-specific flags. */
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| 57 | Elf32_Half e_ehsize; /* Size of ELF header in bytes. */
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| 58 | Elf32_Half e_phentsize; /* Size of program header entry. */
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| 59 | Elf32_Half e_phnum; /* Number of program header entries. */
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| 60 | Elf32_Half e_shentsize; /* Size of section header entry. */
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| 61 | Elf32_Half e_shnum; /* Number of section header entries. */
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| 62 | Elf32_Half e_shstrndx; /* Section name strings section. */
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| 63 | } Elf32_Ehdr;
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| 64 |
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| 65 | /*
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| 66 | * Section header.
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| 67 | */
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| 68 |
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| 69 | typedef struct {
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| 70 | Elf32_Word sh_name; /* Section name (index into the
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| 71 | section header string table). */
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| 72 | Elf32_Word sh_type; /* Section type. */
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| 73 | Elf32_Word sh_flags; /* Section flags. */
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| 74 | Elf32_Addr sh_addr; /* Address in memory image. */
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| 75 | Elf32_Off sh_offset; /* Offset in file. */
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| 76 | Elf32_Size sh_size; /* Size in bytes. */
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| 77 | Elf32_Word sh_link; /* Index of a related section. */
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| 78 | Elf32_Word sh_info; /* Depends on section type. */
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| 79 | Elf32_Size sh_addralign; /* Alignment in bytes. */
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| 80 | Elf32_Size sh_entsize; /* Size of each entry in section. */
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| 81 | } Elf32_Shdr;
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| 82 |
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| 83 | /*
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| 84 | * Program header.
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| 85 | */
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| 86 |
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| 87 | typedef struct {
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| 88 | Elf32_Word p_type; /* Entry type. */
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| 89 | Elf32_Off p_offset; /* File offset of contents. */
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| 90 | Elf32_Addr p_vaddr; /* Virtual address in memory image. */
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| 91 | Elf32_Addr p_paddr; /* Physical address (not used). */
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| 92 | Elf32_Size p_filesz; /* Size of contents in file. */
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| 93 | Elf32_Size p_memsz; /* Size of contents in memory. */
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| 94 | Elf32_Word p_flags; /* Access permission flags. */
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| 95 | Elf32_Size p_align; /* Alignment in memory and file. */
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| 96 | } Elf32_Phdr;
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| 97 |
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| 98 | /*
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| 99 | * Dynamic structure. The ".dynamic" section contains an array of them.
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| 100 | */
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| 101 |
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| 102 | typedef struct {
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| 103 | Elf32_Sword d_tag; /* Entry type. */
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| 104 | union {
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| 105 | Elf32_Size d_val; /* Integer value. */
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| 106 | Elf32_Addr d_ptr; /* Address value. */
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| 107 | } d_un;
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| 108 | } Elf32_Dyn;
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| 109 |
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| 110 | /*
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| 111 | * Relocation entries.
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| 112 | */
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| 113 |
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| 114 | /* Relocations that don't need an addend field. */
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| 115 | typedef struct {
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| 116 | Elf32_Addr r_offset; /* Location to be relocated. */
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| 117 | Elf32_Word r_info; /* Relocation type and symbol index. */
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| 118 | } Elf32_Rel;
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| 119 |
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| 120 | /* Relocations that need an addend field. */
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| 121 | typedef struct {
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| 122 | Elf32_Addr r_offset; /* Location to be relocated. */
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| 123 | Elf32_Word r_info; /* Relocation type and symbol index. */
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| 124 | Elf32_Sword r_addend; /* Addend. */
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| 125 | } Elf32_Rela;
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| 126 |
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| 127 | /* Macros for accessing the fields of r_info. */
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| 128 | #define ELF32_R_SYM(info) ((info) >> 8)
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| 129 | #define ELF32_R_TYPE(info) ((unsigned char)(info))
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| 130 |
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| 131 | /* Macro for constructing r_info from field values. */
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| 132 | #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
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| 133 |
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| 134 | /*
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| 135 | * Symbol table entries.
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| 136 | */
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| 137 |
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| 138 | typedef struct {
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| 139 | Elf32_Word st_name; /* String table index of name. */
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| 140 | Elf32_Addr st_value; /* Symbol value. */
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| 141 | Elf32_Size st_size; /* Size of associated object. */
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| 142 | unsigned char st_info; /* Type and binding information. */
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| 143 | unsigned char st_other; /* Reserved (not used). */
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| 144 | Elf32_Half st_shndx; /* Section index of symbol. */
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| 145 | } Elf32_Sym;
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| 146 |
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| 147 | /* Macros for accessing the fields of st_info. */
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| 148 | #define ELF32_ST_BIND(info) ((info) >> 4)
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| 149 | #define ELF32_ST_TYPE(info) ((info) & 0xf)
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| 150 |
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| 151 | /* Macro for constructing st_info from field values. */
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| 152 | #define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
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| 153 |
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| 154 | #endif
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| 155 |
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