| 1 | /*
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| 2 | * Copyright (C) 2006 Sergey Bondari
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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 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __ELF32_H__
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| 30 | #define __ELF32_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 | #include <mm/as.h>
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| 34 |
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| 35 | /**
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| 36 | * current ELF version
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| 37 | */
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| 38 | #define EV_CURRENT 1
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| 39 |
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| 40 | /**
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| 41 | * ELF types
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| 42 | */
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| 43 | #define ET_NONE 0 // No type
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| 44 | #define ET_REL 1 // Relocatable file
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| 45 | #define ET_EXEC 2 // Executable
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| 46 | #define ET_DYN 3 // Shared object
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| 47 | #define ET_CORE 4 // Core
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| 48 | #define ET_LOPROC 0xff00 // Processor specific
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| 49 | #define ET_HIPROC 0xffff // Processor specific
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| 50 |
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| 51 | /**
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| 52 | * ELF machine types
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| 53 | */
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| 54 | #define EM_NO 0 // No machine
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| 55 | #define EM_SPARC 2 // SPARC
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| 56 | #define EM_386 3 // i386
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| 57 | #define EM_MIPS 8 // MIPS RS3000
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| 58 | #define EM_MIPS_RS3_LE 10 // MIPS RS3000 LE
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| 59 | #define EM_PPC 20 // PPC32
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| 60 | #define EM_PPC64 21 // PPC64
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| 61 | #define EM_SPARCV9 43 // SPARC64
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| 62 | #define EM_IA_64 50 // IA-64
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| 63 | #define EM_X86_64 62 // AMD64/EMT64
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| 64 |
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| 65 | /**
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| 66 | * ELF identification indexes
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| 67 | */
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| 68 | #define EI_MAG0 0
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| 69 | #define EI_MAG1 1
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| 70 | #define EI_MAG2 2
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| 71 | #define EI_MAG3 3
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| 72 | #define EI_CLASS 4 // File class
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| 73 | #define EI_DATA 5 // Data encoding
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| 74 | #define EI_VERSION 6 // File version
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| 75 | #define EI_PAD 7 // Start of padding bytes
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| 76 | #define EI_NIDENT 16 // ELF identification table size
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| 77 |
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| 78 | /**
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| 79 | * ELF magic number
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| 80 | */
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| 81 | #define ELFMAG0 0x7f
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| 82 | #define ELFMAG1 'E'
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| 83 | #define ELFMAG2 'L'
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| 84 | #define ELFMAG3 'F'
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| 85 |
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| 86 | /**
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| 87 | * ELF file classes
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| 88 | */
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| 89 | #define ELFCLASSNONE 0
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| 90 | #define ELFCLASS32 1
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| 91 | #define ELFCLASS64 2
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| 92 |
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| 93 | /**
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| 94 | * ELF data encoding types
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| 95 | */
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| 96 | #define ELFDATANONE 0
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| 97 | #define ELFDATA2LSB 1 // Least significant byte first (little endian)
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| 98 | #define ELFDATA2MSB 2 // Most signigicant byte first (Big endian)
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| 99 |
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| 100 | /**
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| 101 | * ELF error return codes
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| 102 | */
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| 103 | #define EE_OK 0 // No error
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| 104 | #define EE_INVALID 1 // invalid ELF image
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| 105 | #define EE_MEMORY 2 // cannot allocate address space
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| 106 | #define EE_INCOMPATIBLE 3 // ELF image is not compatible with current architecture
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| 107 | #define EE_UNSUPPORTED 4 // Non-supported ELF (e.g. dynamic ELFs)
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| 108 |
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| 109 |
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| 110 | /**
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| 111 | * ELF section types
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| 112 | */
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| 113 | #define SHT_NULL 0
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| 114 | #define SHT_PROGBITS 1
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| 115 | #define SHT_SYMTAB 2
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| 116 | #define SHT_STRTAB 3
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| 117 | #define SHT_RELA 4
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| 118 | #define SHT_HASH 5
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| 119 | #define SHT_DYNAMIC 6
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| 120 | #define SHT_NOTE 7
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| 121 | #define SHT_NOBITS 8
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| 122 | #define SHT_REL 9
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| 123 | #define SHT_SHLIB 10
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| 124 | #define SHT_DYNSYM 11
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| 125 | #define SHT_LOPROC 0x70000000
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| 126 | #define SHT_HIPROC 0x7fffffff
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| 127 | #define SHT_LOUSER 0x80000000
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| 128 | #define SHT_HIUSER 0xffffffff
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| 129 |
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| 130 | /**
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| 131 | * ELF section flags
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| 132 | */
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| 133 | #define SHF_WRITE 0x1
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| 134 | #define SHF_ALLOC 0x2
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| 135 | #define SHF_EXECINSTR 0x4
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| 136 | #define SHF_MASKPROC 0xf0000000
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| 137 |
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| 138 |
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| 139 | /**
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| 140 | * Symbol binding
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| 141 | */
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| 142 | #define STB_LOCAL 0
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| 143 | #define STB_GLOBAL 1
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| 144 | #define STB_WEAK 2
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| 145 | #define STB_LOPROC 13
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| 146 | #define STB_HIPROC 15
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| 147 |
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| 148 | /**
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| 149 | * Symbol types
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| 150 | */
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| 151 | #define STT_NOTYPE 0
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| 152 | #define STT_OBJECT 1
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| 153 | #define STT_FUNC 2
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| 154 | #define STT_SECTION 3
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| 155 | #define STT_FILE 4
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| 156 | #define STT_LOPROC 13
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| 157 | #define STT_HIPROC 15
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| 158 |
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| 159 |
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| 160 | /**
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| 161 | * Program segment types
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| 162 | */
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| 163 | #define PT_NULL 0
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| 164 | #define PT_LOAD 1
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| 165 | #define PT_DYNAMIC 2
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| 166 | #define PT_INTERP 3
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| 167 | #define PT_NOTE 4
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| 168 | #define PT_SHLIB 5
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| 169 | #define PT_PHDR 6
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| 170 | #define PT_LOPROC 0x70000000
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| 171 | #define PT_HIPROC 0x7fffffff
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| 172 |
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| 173 | /**
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| 174 | * 32-bit ELF data types
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| 175 | */
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| 176 | typedef __u32 elf32_addr;
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| 177 | typedef __u16 elf32_half;
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| 178 | typedef __u32 elf32_off;
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| 179 | typedef int elf32_sword;
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| 180 | typedef __u32 elf32_word;
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| 181 |
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| 182 | /**
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| 183 | * 32-bit ELF header
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| 184 | */
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| 185 | struct elf32_header {
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| 186 | __u8 e_ident[EI_NIDENT];
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| 187 | elf32_half e_type;
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| 188 | elf32_half e_machine;
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| 189 | elf32_word e_version;
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| 190 | elf32_addr e_entry;
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| 191 | elf32_off e_phoff;
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| 192 | elf32_off e_shoff;
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| 193 | elf32_word e_flags;
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| 194 | elf32_half e_ehsize;
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| 195 | elf32_half e_phentsize;
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| 196 | elf32_half e_phnum;
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| 197 | elf32_half e_shentsize;
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| 198 | elf32_half e_shnum;
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| 199 | elf32_half e_shstrndx;
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| 200 | };
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| 201 |
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| 202 |
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| 203 | /*
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| 204 | * 32-bit ELF section header
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| 205 | */
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| 206 | struct elf32_section_header {
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| 207 | elf32_word sh_name;
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| 208 | elf32_word sh_type;
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| 209 | elf32_word sh_flags;
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| 210 | elf32_addr sh_addr;
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| 211 | elf32_off sh_offset;
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| 212 | elf32_word sh_size;
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| 213 | elf32_word sh_link;
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| 214 | elf32_word sh_info;
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| 215 | elf32_word sh_addralign;
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| 216 | elf32_word sh_entsize;
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| 217 | };
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| 218 |
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| 219 |
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| 220 | /*
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| 221 | * 32-bit ELF symbol table entry
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| 222 | */
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| 223 | struct elf32_symbol {
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| 224 | elf32_word st_name;
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| 225 | elf32_addr st_value;
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| 226 | elf32_word st_size;
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| 227 | __u8 st_info;
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| 228 | __u8 st_other;
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| 229 | elf32_half st_shndx;
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| 230 | };
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| 231 |
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| 232 |
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| 233 | /*
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| 234 | * 32-bit ELF program header
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| 235 | */
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| 236 | struct elf32_program_header {
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| 237 | elf32_word p_type;
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| 238 | elf32_off p_offset;
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| 239 | elf32_addr pv_addr;
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| 240 | elf32_addr pp_addr;
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| 241 | elf32_word p_filesz;
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| 242 | elf32_word p_memsz;
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| 243 | elf32_word p_flags;
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| 244 | elf32_word p_align;
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| 245 | };
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| 246 |
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| 247 | typedef struct elf32_header elf32_header_t;
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| 248 | typedef struct elf32_section_header elf32_section_header_t;
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| 249 | typedef struct elf32_symbol elf32_symbol_t;
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| 250 | typedef struct elf32_program_header elf32_program_header_t;
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| 251 |
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| 252 |
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| 253 |
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| 254 | extern int elf32_load(__address header, as_t * as);
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| 255 |
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| 256 | #endif
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