| 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 | * $FreeBSD: src/sys/sys/elf32.h,v 1.8 2002/05/30 08:32:18 dfr Exp $
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| 27 | */
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| 28 |
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| 29 | #ifndef ___k_kLdrFmts_elf32_h___
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| 30 | #define ___k_kLdrFmts_elf32_h___
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| 31 |
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| 32 | #include <k/kDefs.h>
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| 33 | #include <k/kTypes.h>
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| 34 | #include <k/kLdrFmts/elf_common.h>
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| 35 |
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| 36 | /*
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| 37 | * ELF definitions common to all 32-bit architectures.
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| 38 | */
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| 39 |
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| 40 | typedef KU32 Elf32_Addr;
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| 41 | typedef KU16 Elf32_Half;
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| 42 | typedef KU32 Elf32_Off;
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| 43 | typedef KI32 Elf32_Sword;
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| 44 | typedef KU32 Elf32_Word;
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| 45 | typedef KU32 Elf32_Size;
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| 46 | typedef Elf32_Off Elf32_Hashelt;
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| 47 |
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| 48 | /*
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| 49 | * ELF header.
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| 50 | */
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| 51 |
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| 52 | typedef struct Elf32_Ehdr {
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| 53 | unsigned char e_ident[EI_NIDENT]; /* File identification. */
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| 54 | Elf32_Half e_type; /* File type. */
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| 55 | Elf32_Half e_machine; /* Machine architecture. */
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| 56 | Elf32_Word e_version; /* ELF format version. */
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| 57 | Elf32_Addr e_entry; /* Entry point. */
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| 58 | Elf32_Off e_phoff; /* Program header file offset. */
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| 59 | Elf32_Off e_shoff; /* Section header file offset. */
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| 60 | Elf32_Word e_flags; /* Architecture-specific flags. */
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| 61 | Elf32_Half e_ehsize; /* Size of ELF header in bytes. */
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| 62 | Elf32_Half e_phentsize; /* Size of program header entry. */
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| 63 | Elf32_Half e_phnum; /* Number of program header entries. */
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| 64 | Elf32_Half e_shentsize; /* Size of section header entry. */
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| 65 | Elf32_Half e_shnum; /* Number of section header entries. */
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| 66 | Elf32_Half e_shstrndx; /* Section name strings section. */
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| 67 | } Elf32_Ehdr;
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| 68 |
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| 69 | /*
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| 70 | * Section header.
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| 71 | */
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| 72 |
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| 73 | typedef struct {
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| 74 | Elf32_Word sh_name; /* Section name (index into the
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| 75 | section header string table). */
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| 76 | Elf32_Word sh_type; /* Section type. */
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| 77 | Elf32_Word sh_flags; /* Section flags. */
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| 78 | Elf32_Addr sh_addr; /* Address in memory image. */
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| 79 | Elf32_Off sh_offset; /* Offset in file. */
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| 80 | Elf32_Size sh_size; /* Size in bytes. */
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| 81 | Elf32_Word sh_link; /* Index of a related section. */
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| 82 | Elf32_Word sh_info; /* Depends on section type. */
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| 83 | Elf32_Size sh_addralign; /* Alignment in bytes. */
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| 84 | Elf32_Size sh_entsize; /* Size of each entry in section. */
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| 85 | } Elf32_Shdr;
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| 86 |
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| 87 | /*
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| 88 | * Program header.
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| 89 | */
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| 90 |
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| 91 | typedef struct {
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| 92 | Elf32_Word p_type; /* Entry type. */
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| 93 | Elf32_Off p_offset; /* File offset of contents. */
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| 94 | Elf32_Addr p_vaddr; /* Virtual address in memory image. */
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| 95 | Elf32_Addr p_paddr; /* Physical address (not used). */
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| 96 | Elf32_Size p_filesz; /* Size of contents in file. */
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| 97 | Elf32_Size p_memsz; /* Size of contents in memory. */
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| 98 | Elf32_Word p_flags; /* Access permission flags. */
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| 99 | Elf32_Size p_align; /* Alignment in memory and file. */
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| 100 | } Elf32_Phdr;
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| 101 |
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| 102 | /*
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| 103 | * Dynamic structure. The ".dynamic" section contains an array of them.
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| 104 | */
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| 105 |
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| 106 | typedef struct {
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| 107 | Elf32_Sword d_tag; /* Entry type. */
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| 108 | union {
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| 109 | Elf32_Size d_val; /* Integer value. */
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| 110 | Elf32_Addr d_ptr; /* Address value. */
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| 111 | } d_un;
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| 112 | } Elf32_Dyn;
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| 113 |
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| 114 | /*
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| 115 | * Relocation entries.
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| 116 | */
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| 117 |
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| 118 | /* Relocations that don't need an addend field. */
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| 119 | typedef struct {
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| 120 | Elf32_Addr r_offset; /* Location to be relocated. */
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| 121 | Elf32_Word r_info; /* Relocation type and symbol index. */
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| 122 | } Elf32_Rel;
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| 123 |
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| 124 | /* Relocations that need an addend field. */
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| 125 | typedef struct {
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| 126 | Elf32_Addr r_offset; /* Location to be relocated. */
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| 127 | Elf32_Word r_info; /* Relocation type and symbol index. */
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| 128 | Elf32_Sword r_addend; /* Addend. */
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| 129 | } Elf32_Rela;
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| 130 |
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| 131 | /* Macros for accessing the fields of r_info. */
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| 132 | #define ELF32_R_SYM(info) ((info) >> 8)
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| 133 | #define ELF32_R_TYPE(info) ((unsigned char)(info))
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| 134 |
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| 135 | /* Macro for constructing r_info from field values. */
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| 136 | #define ELF32_R_INFO(sym, type) (((sym) << 8) + (unsigned char)(type))
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| 137 |
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| 138 | /*
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| 139 | * Symbol table entries.
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| 140 | */
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| 141 |
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| 142 | typedef struct {
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| 143 | Elf32_Word st_name; /* String table index of name. */
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| 144 | Elf32_Addr st_value; /* Symbol value. */
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| 145 | Elf32_Size st_size; /* Size of associated object. */
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| 146 | unsigned char st_info; /* Type and binding information. */
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| 147 | unsigned char st_other; /* Reserved (not used). */
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| 148 | Elf32_Half st_shndx; /* Section index of symbol. */
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| 149 | } Elf32_Sym;
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| 150 |
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| 151 | /* Macros for accessing the fields of st_info. */
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| 152 | #define ELF32_ST_BIND(info) ((info) >> 4)
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| 153 | #define ELF32_ST_TYPE(info) ((info) & 0xf)
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| 154 |
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| 155 | /* Macro for constructing st_info from field values. */
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| 156 | #define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
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| 157 |
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| 158 | #endif
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| 159 |
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