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annotate packages/services/loader/current/include/elf.h @ 184:022f1e506033

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Merge from eCos master repository on 2001-10-02-17:59:22-BST
author jlarmour
date Tue, 02 Oct 2001 18:28:24 +0000
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children e0c0827131d1
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1 #ifndef CYGONCE_LOADER_ELF_H
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2 #define CYGONCE_LOADER_ELF_H
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3
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4 //==========================================================================
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5 //
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6 // elf.h
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7 //
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8 // ELF file format definitions
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9 //
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10 //==========================================================================
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11 //####COPYRIGHTBEGIN####
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12 //
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13 // -------------------------------------------
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14 // The contents of this file are subject to the Red Hat eCos Public License
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15 // Version 1.1 (the "License"); you may not use this file except in
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16 // compliance with the License. You may obtain a copy of the License at
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17 // http://www.redhat.com/
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18 //
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19 // Software distributed under the License is distributed on an "AS IS"
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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21 // License for the specific language governing rights and limitations under
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22 // the License.
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23 //
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24 // The Original Code is eCos - Embedded Configurable Operating System,
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25 // released September 30, 1998.
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26 //
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27 // The Initial Developer of the Original Code is Red Hat.
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28 // Portions created by Red Hat are
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29 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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30 // All Rights Reserved.
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31 // -------------------------------------------
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32 //
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33 //####COPYRIGHTEND####
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34 //==========================================================================
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35 //#####DESCRIPTIONBEGIN####
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36 //
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37 // Author(s): nickg
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38 // Contributors: nickg
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39 // Date: 2000-11-15
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40 // Purpose: Define ELF file format
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41 // Description: The types defined here describe the ELF file format.
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42 //
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43 // Usage: #include <cyg/loader/elf.h>
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44 //
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45 //####DESCRIPTIONEND####
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46 //
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47 //==========================================================================
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48 //
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49 // Quite a lot of this file was taken from the BSD exec_elf.h header file.
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50 // Hence we should show you this...
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51 //
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52 /* $OpenBSD: exec_elf.h,v 1.20 1999/09/19 16:16:49 kstailey Exp $ */
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53 /*
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54 * Copyright (c) 1995, 1996 Erik Theisen. All rights reserved.
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55 *
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56 * Redistribution and use in source and binary forms, with or without
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57 * modification, are permitted provided that the following conditions
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58 * are met:
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59 * 1. Redistributions of source code must retain the above copyright
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60 * notice, this list of conditions and the following disclaimer.
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61 * 2. Redistributions in binary form must reproduce the above copyright
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62 * notice, this list of conditions and the following disclaimer in the
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63 * documentation and/or other materials provided with the distribution.
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64 * 3. The name of the author may not be used to endorse or promote products
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65 * derived from this software without specific prior written permission
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66 *
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67 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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68 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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69 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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70 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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71 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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72 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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73 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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74 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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75 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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76 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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77 */
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78 //==========================================================================
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79
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80 #include <cyg/infra/cyg_type.h>
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81
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82 // -------------------------------------------------------------------------
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83 // Basic types:
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84
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85 typedef cyg_uint32 Elf32_Addr;
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86 typedef cyg_uint32 Elf32_Off;
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87 typedef cyg_uint16 Elf32_Half;
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88 typedef cyg_uint32 Elf32_Word;
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89 typedef cyg_int32 Elf32_Sword;
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90
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91 typedef cyg_uint64 Elf64_Addr;
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92 typedef cyg_uint64 Elf64_Off;
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93 typedef cyg_uint16 Elf64_Half;
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94 typedef cyg_uint32 Elf64_Word;
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95 typedef cyg_int32 Elf64_Sword;
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96 typedef cyg_uint64 Elf64_Xword;
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97 typedef cyg_int64 Elf64_Sxword;
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98
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99 // -------------------------------------------------------------------------
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100 // ELF header
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101
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102 #define EI_NIDENT 16
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103
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104 typedef struct {
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105 unsigned char e_ident[EI_NIDENT];
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106 Elf32_Half e_type;
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107 Elf32_Half e_machine;
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108 Elf32_Word e_version;
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109 Elf32_Addr e_entry;
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110 Elf32_Off e_phoff;
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111 Elf32_Off e_shoff;
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112 Elf32_Word e_flags;
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113 Elf32_Half e_ehsize;
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114 Elf32_Half e_phentsize;
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115 Elf32_Half e_phnum;
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116 Elf32_Half e_shentsize;
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117 Elf32_Half e_shnum;
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118 Elf32_Half e_shtrndx;
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119 } Elf32_Ehdr;
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120
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121 typedef struct {
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122 unsigned char e_ident[EI_NIDENT];
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123 Elf64_Half e_type;
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124 Elf64_Half e_machine;
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125 Elf64_Word e_version;
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126 Elf64_Addr e_entry;
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127 Elf64_Off e_phoff;
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128 Elf64_Off e_shoff;
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129 Elf64_Word e_flags;
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130 Elf64_Half e_ehsize;
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131 Elf64_Half e_phentsize;
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132 Elf64_Half e_phnum;
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133 Elf64_Half e_shentsize;
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134 Elf64_Half e_shnum;
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135 Elf64_Half e_shtrndx;
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136 } Elf64_Ehdr;
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137
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138 // -------------------------------------------------------------------------
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139 /* e_ident[] identification indexes */
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140
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141 #define EI_MAG0 0 /* file ID */
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142 #define EI_MAG1 1 /* file ID */
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143 #define EI_MAG2 2 /* file ID */
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144 #define EI_MAG3 3 /* file ID */
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145 #define EI_CLASS 4 /* file class */
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146 #define EI_DATA 5 /* data encoding */
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147 #define EI_VERSION 6 /* ELF header version */
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148 #define EI_OSABI 7 /* Operating system/ABI identification */
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149 #define EI_ABIVERSION 8 /* ABI version */
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150 #define EI_PAD 9 /* start of pad bytes */
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151
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152 // -------------------------------------------------------------------------
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153 /* e_ident[] magic number */
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154
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155 #define ELFMAG0 0x7f /* e_ident[EI_MAG0] */
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156 #define ELFMAG1 'E' /* e_ident[EI_MAG1] */
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157 #define ELFMAG2 'L' /* e_ident[EI_MAG2] */
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158 #define ELFMAG3 'F' /* e_ident[EI_MAG3] */
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159 #define ELFMAG "\177ELF" /* magic */
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160 #define SELFMAG 4 /* size of magic */
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161
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162 // -------------------------------------------------------------------------
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163 /* e_ident[] file class */
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164
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165 #define ELFCLASSNONE 0 /* invalid */
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166 #define ELFCLASS32 1 /* 32-bit objs */
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167 #define ELFCLASS64 2 /* 64-bit objs */
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168 #define ELFCLASSNUM 3 /* number of classes */
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169
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170 // -------------------------------------------------------------------------
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171 /* e_ident[] data encoding */
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172
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173 #define ELFDATANONE 0 /* invalid */
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174 #define ELFDATA2LSB 1 /* Little-Endian */
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175 #define ELFDATA2MSB 2 /* Big-Endian */
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176 #define ELFDATANUM 3 /* number of data encode defines */
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177
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178 // -------------------------------------------------------------------------
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179 /* e_ident */
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180
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181 #define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \
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182 (ehdr).e_ident[EI_MAG1] == ELFMAG1 && \
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183 (ehdr).e_ident[EI_MAG2] == ELFMAG2 && \
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184 (ehdr).e_ident[EI_MAG3] == ELFMAG3)
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185
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186 // -------------------------------------------------------------------------
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187 /* e_type */
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188
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189 #define ET_NONE 0 /* No file type */
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190 #define ET_REL 1 /* relocatable file */
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191 #define ET_EXEC 2 /* executable file */
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192 #define ET_DYN 3 /* shared object file */
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193 #define ET_CORE 4 /* core file */
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194 #define ET_NUM 5 /* number of types */
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195 #define ET_LOOS 0xfe00 /* Operating system-specific */
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196 #define ET_HIOS 0xfeff /* Operating system-specific */
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197 #define ET_LOPROC 0xff00 /* reserved range for processor */
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198 #define ET_HIPROC 0xffff /* specific e_type */
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199
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200 // -------------------------------------------------------------------------
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201 /* e_machine */
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202 // The following values taken from 22 June 2000 SysV ABI spec, updated with
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203 // extra values from binutils elf/common.h.
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204
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205 #define EM_NONE 0 // No machine
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206 #define EM_M32 1 // AT&T WE 32100
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207 #define EM_SPARC 2 // SPARC
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208 #define EM_386 3 // Intel 80386
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209 #define EM_68K 4 // Motorola 68000
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210 #define EM_88K 5 // Motorola 88000
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211 #define EM_860 7 // Intel 80860
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212 #define EM_MIPS 8 // MIPS I Architecture
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213 #define EM_S370 9 // IBM System/370 Processor
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214 #define EM_MIPS_RS3_LE 10 // MIPS RS3000 Little-endian
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215 #define EM_PARISC 15 // Hewlett-Packard PA-RISC
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216 #define EM_VPP500 17 // Fujitsu VPP500
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217 #define EM_SPARC32PLUS 18 // Enhanced instruction set SPARC
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218 #define EM_960 19 // Intel 80960
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219 #define EM_PPC 20 // PowerPC
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220 #define EM_PPC64 21 // 64-bit PowerPC
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221 #define EM_V800 36 // NEC V800
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222 #define EM_FR20 37 // Fujitsu FR20
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223 #define EM_RH32 38 // TRW RH-32
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224 #define EM_RCE 39 // Motorola RCE
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225 #define EM_ARM 40 // Advanced RISC Machines ARM
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226 #define EM_ALPHA 41 // Digital Alpha
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227 #define EM_SH 42 // Hitachi SH
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228 #define EM_SPARCV9 43 // SPARC Version 9
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229 #define EM_TRICORE 44 // Siemens Tricore embedded processor
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230 #define EM_ARC 45 // Argonaut RISC Core, Argonaut Technologies Inc.
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231 #define EM_H8_300 46 // Hitachi H8/300
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232 #define EM_H8_300H 47 // Hitachi H8/300H
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233 #define EM_H8S 48 // Hitachi H8S
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234 #define EM_H8_500 49 // Hitachi H8/500
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235 #define EM_IA_64 50 // Intel IA-64 processor architecture
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236 #define EM_MIPS_X 51 // Stanford MIPS-X
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237 #define EM_COLDFIRE 52 // Motorola ColdFire
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238 #define EM_68HC12 53 // Motorola M68HC12
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239 #define EM_MMA 54 // Fujitsu MMA Multimedia Accelerator
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240 #define EM_PCP 55 // Siemens PCP
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241 #define EM_NCPU 56 // Sony nCPU embedded RISC processor
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242 #define EM_NDR1 57 // Denso NDR1 microprocessor
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243 #define EM_STARCORE 58 // Motorola Star*Core processor
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244 #define EM_ME16 59 // Toyota ME16 processor
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245 #define EM_ST100 60 // STMicroelectronics ST100 processor
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246 #define EM_TINYJ 61 // Advanced Logic Corp. TinyJ embedded processor family
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247 #define EM_FX66 66 // Siemens FX66 microcontroller
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248 #define EM_ST9PLUS 67 // STMicroelectronics ST9+ 8/16 bit microcontroller
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249 #define EM_ST7 68 // STMicroelectronics ST7 8-bit microcontroller
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250 #define EM_68HC16 69 // Motorola MC68HC16 Microcontroller
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251 #define EM_68HC11 70 // Motorola MC68HC11 Microcontroller
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252 #define EM_68HC08 71 // Motorola MC68HC08 Microcontroller
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253 #define EM_68HC05 72 // Motorola MC68HC05 Microcontroller
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254 #define EM_SVX 73 // Silicon Graphics SVx
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255 #define EM_ST19 74 // STMicroelectronics ST19 8-bit microcontroller
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256 #define EM_VAX 75 // Digital VAX
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257 #define EM_CRIS 76 // Axis Communications 32-bit embedded processor
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258 #define EM_JAVELIN 77 // Infineon Technologies 32-bit embedded processor
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259 #define EM_FIREPATH 78 // Element 14 64-bit DSP Processor
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260 #define EM_ZSP 79 // LSI Logic 16-bit DSP Processor
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261 #define EM_MMIX 80 // Donald Knuth's educational 64-bit processor
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262 #define EM_HUANY 81 // Harvard University machine-independent object files
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263 #define EM_PRISM 82 // SiTera Prism
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264
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265 /* Cygnus PowerPC ELF backend. Written in the absence of an ABI. */
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266 #define EM_CYGNUS_POWERPC 0x9025
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267
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268 /* Old version of Sparc v9, from before the ABI; this should be
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269 removed shortly. */
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270 #define EM_OLD_SPARCV9 11
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271
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272 /* Old version of PowerPC, this should be removed shortly. */
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273 #define EM_PPC_OLD 17
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274
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275 /* Cygnus ARC ELF backend. Written in the absence of an ABI. */
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276 #define EM_CYGNUS_ARC 0x9040
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277
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278 /* Cygnus M32R ELF backend. Written in the absence of an ABI. */
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279 #define EM_CYGNUS_M32R 0x9041
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280
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281 /* Alpha backend magic number. Written in the absence of an ABI. */
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282 //#define EM_ALPHA 0x9026
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283
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284 /* D10V backend magic number. Written in the absence of an ABI. */
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285 #define EM_CYGNUS_D10V 0x7650
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286
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287 /* D30V backend magic number. Written in the absence of an ABI. */
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288 #define EM_CYGNUS_D30V 0x7676
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289
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290 /* V850 backend magic number. Written in the absense of an ABI. */
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291 #define EM_CYGNUS_V850 0x9080
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292
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293 /* mn10200 and mn10300 backend magic numbers.
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294 Written in the absense of an ABI. */
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295 #define EM_CYGNUS_MN10200 0xdead
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296 #define EM_CYGNUS_MN10300 0xbeef
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297
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298 /* FR30 magic number - no EABI available. */
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299 #define EM_CYGNUS_FR30 0x3330
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300
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301 /* AVR magic number
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302 Written in the absense of an ABI. */
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303 #define EM_AVR 0x1057
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304
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305 // -------------------------------------------------------------------------
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306 /* Version */
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307
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308 #define EV_NONE 0 /* Invalid */
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309 #define EV_CURRENT 1 /* Current */
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310 #define EV_NUM 2 /* number of versions */
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311
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312 // -------------------------------------------------------------------------
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313 /* Section Header */
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314
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315 typedef struct {
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316 Elf32_Word sh_name; /* name - index into section header
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317 string table section */
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318 Elf32_Word sh_type; /* type */
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319 Elf32_Word sh_flags; /* flags */
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320 Elf32_Addr sh_addr; /* address */
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321 Elf32_Off sh_offset; /* file offset */
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322 Elf32_Word sh_size; /* section size */
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323 Elf32_Word sh_link; /* section header table index link */
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324 Elf32_Word sh_info; /* extra information */
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325 Elf32_Word sh_addralign; /* address alignment */
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326 Elf32_Word sh_entsize; /* section entry size */
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327 } Elf32_Shdr;
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328
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329 typedef struct {
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330 Elf64_Word sh_name; /* section name */
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331 Elf64_Word sh_type; /* section type */
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332 Elf64_Xword sh_flags; /* section flags */
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333 Elf64_Addr sh_addr; /* virtual address */
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334 Elf64_Off sh_offset; /* file offset */
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335 Elf64_Xword sh_size; /* section size */
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336 Elf64_Word sh_link; /* link to another */
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337 Elf64_Word sh_info; /* misc info */
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338 Elf64_Xword sh_addralign; /* memory alignment */
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339 Elf64_Xword sh_entsize; /* table entry size */
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340 } Elf64_Shdr;
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341
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342 // -------------------------------------------------------------------------
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343 /* Special Section Indexes */
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344
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345 #define SHN_UNDEF 0 /* undefined */
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346 #define SHN_LORESERVE 0xff00 /* lower bounds of reserved indexes */
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347 #define SHN_LOPROC 0xff00 /* reserved range for processor */
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348 #define SHN_HIPROC 0xff1f /* specific section indexes */
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349 #define SHN_LOOS 0xff20 /* reserved range for operating */
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350 #define SHN_HIOS 0xff3f /* system specific section indexes */
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351 #define SHN_ABS 0xfff1 /* absolute value */
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352 #define SHN_COMMON 0xfff2 /* common symbol */
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353 #define SHN_XINDEX 0xffff /* escape value for oversize index */
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354 #define SHN_HIRESERVE 0xffff /* upper bounds of reserved indexes */
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355
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356 // -------------------------------------------------------------------------
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357 /* sh_type */
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358
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359 #define SHT_NULL 0 /* inactive */
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360 #define SHT_PROGBITS 1 /* program defined information */
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361 #define SHT_SYMTAB 2 /* symbol table section */
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362 #define SHT_STRTAB 3 /* string table section */
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363 #define SHT_RELA 4 /* relocation section with addends*/
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364 #define SHT_HASH 5 /* symbol hash table section */
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365 #define SHT_DYNAMIC 6 /* dynamic section */
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366 #define SHT_NOTE 7 /* note section */
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367 #define SHT_NOBITS 8 /* no space section */
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368 #define SHT_REL 9 /* relation section without addends */
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369 #define SHT_SHLIB 10 /* reserved - purpose unknown */
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370 #define SHT_DYNSYM 11 /* dynamic symbol table section */
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371 #define SHT_INIT_ARRAY 14 /* init procedure array */
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372 #define SHT_FINI_ARRAY 15 /* fini procedure array */
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373 #define SHT_PREINIT_ARRAY 16 /* preinit procedure array */
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374 #define SHT_GROUP 17 /* section group */
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375 #define SHT_SYMTAB_SHNDX 18 /* oversize index table */
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376 #define SHT_NUM 19 /* number of section types */
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377 #define SHT_LOOS 0x60000000 /* reserved range for O/S */
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378 #define SHT_HIOS 0x6fffffff /* specific section header types */
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379 #define SHT_LOPROC 0x70000000 /* reserved range for processor */
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380 #define SHT_HIPROC 0x7fffffff /* specific section header types */
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381 #define SHT_LOUSER 0x80000000 /* reserved range for application */
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382 #define SHT_HIUSER 0xffffffff /* specific indexes */
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383
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384 // -------------------------------------------------------------------------
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385 /* Section names */
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386
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387 #define ELF_BSS ".bss" /* uninitialized data */
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388 #define ELF_DATA ".data" /* initialized data */
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389 #define ELF_DEBUG ".debug" /* debug */
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390 #define ELF_DYNAMIC ".dynamic" /* dynamic linking information */
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391 #define ELF_DYNSTR ".dynstr" /* dynamic string table */
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392 #define ELF_DYNSYM ".dynsym" /* dynamic symbol table */
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393 #define ELF_FINI ".fini" /* termination code */
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394 #define ELF_GOT ".got" /* global offset table */
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395 #define ELF_HASH ".hash" /* symbol hash table */
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396 #define ELF_INIT ".init" /* initialization code */
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397 #define ELF_REL_DATA ".rel.data" /* relocation data */
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398 #define ELF_REL_FINI ".rel.fini" /* relocation termination code */
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399 #define ELF_REL_INIT ".rel.init" /* relocation initialization code */
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400 #define ELF_REL_DYN ".rel.dyn" /* relocaltion dynamic link info */
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401 #define ELF_REL_RODATA ".rel.rodata" /* relocation read-only data */
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402 #define ELF_REL_TEXT ".rel.text" /* relocation code */
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403 #define ELF_RODATA ".rodata" /* read-only data */
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404 #define ELF_SHSTRTAB ".shstrtab" /* section header string table */
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405 #define ELF_STRTAB ".strtab" /* string table */
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406 #define ELF_SYMTAB ".symtab" /* symbol table */
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407 #define ELF_TEXT ".text" /* code */
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408
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409 // -------------------------------------------------------------------------
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410 /* Section Attribute Flags - sh_flags */
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411
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412 #define SHF_WRITE 0x001 /* Writable */
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413 #define SHF_ALLOC 0x002 /* occupies memory */
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414 #define SHF_EXECINSTR 0x004 /* executable */
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415 #define SHF_MERGE 0x010 /* merge data */
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416 #define SHF_STRINGS 0x020 /* contains strings */
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417 #define SHF_INFO_LINK 0x040 /* link in sh_info field */
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418 #define SHF_LINK_ORDER 0x080 /* preserve link order */
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419 #define SHF_OS_NONCONFORMING 0x100 /* special OS-specific */
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420 /* processing needed */
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421 #define SHF_GROUP 0x200 /* member of group */
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422 #define SHF_MASKOS 0x0ff00000 /* reserved bits for OS */
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423 /* specific section attributes */
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424 #define SHF_MASKPROC 0xf0000000 /* reserved bits for processor */
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425 /* specific section attributes */
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426
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427 // -------------------------------------------------------------------------
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428 /* Symbol Table Entry */
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429
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430 typedef struct {
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431 Elf32_Word st_name; /* name - index into string table */
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432 Elf32_Addr st_value; /* symbol value */
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433 Elf32_Word st_size; /* symbol size */
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434 unsigned char st_info; /* type and binding */
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435 unsigned char st_other; /* visibility */
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436 Elf32_Half st_shndx; /* section header index */
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437 } Elf32_Sym;
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438
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439 typedef struct {
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440 Elf64_Word st_name; /* Symbol name index in str table */
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441 unsigned char st_info; /* type / binding attrs */
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442 unsigned char st_other; /* visibility */
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443 Elf64_Half st_shndx; /* section index of symbol */
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444 Elf64_Addr st_value; /* value of symbol */
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445 Elf64_Xword st_size; /* size of symbol */
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446 } Elf64_Sym;
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447
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448 // -------------------------------------------------------------------------
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449 /* Symbol table index */
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450
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451 #define STN_UNDEF 0 /* undefined */
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452
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453 /* Extract symbol info - st_info */
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454 #define ELF32_ST_BIND(x) ((x) >> 4)
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455 #define ELF32_ST_TYPE(x) (((unsigned int) x) & 0xf)
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456 #define ELF32_ST_INFO(b,t) (((b) << 4) + ((t) & 0xf))
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457
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458 #define ELF64_ST_BIND(x) ((x) >> 4)
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459 #define ELF64_ST_TYPE(x) (((unsigned int) x) & 0xf)
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460 #define ELF64_ST_INFO(b,t) (((b) << 4) + ((t) & 0xf))
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461
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462 #define ELF32_ST_VISIBILITY(o) ((o)&0x3)
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463 #define ELF64_ST_VISIBILITY(o) ((o)&0x3)
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464
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465 // -------------------------------------------------------------------------
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466 /* Symbol Binding - ELF32_ST_BIND - st_info */
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467
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468 #define STB_LOCAL 0 /* Local symbol */
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469 #define STB_GLOBAL 1 /* Global symbol */
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470 #define STB_WEAK 2 /* like global - lower precedence */
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471 #define STB_NUM 3 /* number of symbol bindings */
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472 #define STB_LOOS 10 /* reserved range for OS */
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473 #define STB_HIOS 12 /* specific symbol bindings */
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474 #define STB_LOPROC 13 /* reserved range for processor */
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475 #define STB_HIPROC 15 /* specific symbol bindings */
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476
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477 // -------------------------------------------------------------------------
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478 /* Symbol type - ELF32_ST_TYPE - st_info */
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479
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480 #define STT_NOTYPE 0 /* not specified */
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481 #define STT_OBJECT 1 /* data object */
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482 #define STT_FUNC 2 /* function */
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483 #define STT_SECTION 3 /* section */
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484 #define STT_FILE 4 /* file */
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485 #define STT_COMMON 5 /* common block */
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486 #define STT_NUM 6 /* number of symbol types */
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487 #define STT_LOOS 10 /* reserved range for OS */
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488 #define STT_HIOS 12 /* specific symbol types */
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489 #define STT_LOPROC 13 /* reserved range for processor */
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490 #define STT_HIPROC 15 /* specific symbol types */
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491
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492 // -------------------------------------------------------------------------
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493 // symbol visibility in st_other
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494
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495 #define STV_DEFAULT 0 /* default to binding type */
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496 #define STV_INTERNAL 1 /* processor specific */
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497 #define STV_HIDDEN 2 /* invisible */
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498 #define STV_PROTECTED 3 /* non-premptable */
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499
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500 // -------------------------------------------------------------------------
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501 // 32 bit relocation records
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502
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503 /* Relocation entry with implicit addend */
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504 typedef struct
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505 {
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506 Elf32_Addr r_offset; /* offset of relocation */
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507 Elf32_Word r_info; /* symbol table index and type */
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508 } Elf32_Rel;
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509
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510 /* Relocation entry with explicit addend */
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511 typedef struct
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512 {
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513 Elf32_Addr r_offset; /* offset of relocation */
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514 Elf32_Word r_info; /* symbol table index and type */
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515 Elf32_Sword r_addend;
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516 } Elf32_Rela;
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517
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518 /* Extract relocation info - r_info */
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519 #define ELF32_R_SYM(i) ((i) >> 8)
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520 #define ELF32_R_TYPE(i) ((unsigned char) (i))
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521 #define ELF32_R_INFO(s,t) (((s) << 8) + (unsigned char)(t))
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522
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523 // -------------------------------------------------------------------------
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524 // 64 bit equivalents of above structures and macros.
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525
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526 typedef struct {
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527 Elf64_Addr r_offset; /* where to do it */
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528 Elf64_Xword r_info; /* index & type of relocation */
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529 } Elf64_Rel;
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530
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531 typedef struct {
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532 Elf64_Addr r_offset; /* where to do it */
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533 Elf64_Xword r_info; /* index & type of relocation */
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534 Elf64_Sxword r_addend; /* adjustment value */
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535 } Elf64_RelA;
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536
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537 #define ELF64_R_SYM(info) ((info) >> 32)
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538 #define ELF64_R_TYPE(info) ((info) & 0xFFFFFFFF)
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539 #define ELF64_R_INFO(s,t) (((s) << 32) + (u_int32_t)(t))
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540
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541 // -------------------------------------------------------------------------
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542 /* Program Header */
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543
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544 typedef struct {
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545 Elf32_Word p_type; /* segment type */
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546 Elf32_Off p_offset; /* segment offset */
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547 Elf32_Addr p_vaddr; /* virtual address of segment */
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548 Elf32_Addr p_paddr; /* physical address - ignored? */
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549 Elf32_Word p_filesz; /* number of bytes in file for seg. */
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550 Elf32_Word p_memsz; /* number of bytes in mem. for seg. */
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551 Elf32_Word p_flags; /* flags */
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552 Elf32_Word p_align; /* memory alignment */
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553 } Elf32_Phdr;
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554
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555 typedef struct {
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556 Elf64_Word p_type; /* entry type */
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557 Elf64_Word p_flags; /* flags */
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558 Elf64_Off p_offset; /* offset */
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559 Elf64_Addr p_vaddr; /* virtual address */
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560 Elf64_Addr p_paddr; /* physical address */
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561 Elf64_Xword p_filesz; /* file size */
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562 Elf64_Xword p_memsz; /* memory size */
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563 Elf64_Xword p_align; /* memory & file alignment */
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564 } Elf64_Phdr;
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565
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566 // -------------------------------------------------------------------------
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diff changeset
567 /* Segment types - p_type */
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568
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569 #define PT_NULL 0 /* unused */
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570 #define PT_LOAD 1 /* loadable segment */
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571 #define PT_DYNAMIC 2 /* dynamic linking section */
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572 #define PT_INTERP 3 /* the RTLD */
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573 #define PT_NOTE 4 /* auxiliary information */
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574 #define PT_SHLIB 5 /* reserved - purpose undefined */
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575 #define PT_PHDR 6 /* program header */
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576 #define PT_NUM 7 /* Number of segment types */
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577 #define PT_LOOS 0x60000000 /* reserved range for OS */
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578 #define PT_HIOS 0x6fffffff /* specific segment types */
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579 #define PT_LOPROC 0x70000000 /* reserved range for processor */
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580 #define PT_HIPROC 0x7fffffff /* specific segment types */
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581
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582 // -------------------------------------------------------------------------
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583 /* Segment flags - p_flags */
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584
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585 #define PF_X 0x1 /* Executable */
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586 #define PF_W 0x2 /* Writable */
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587 #define PF_R 0x4 /* Readable */
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588 #define PF_MASKOS 0x0ff00000 /* reserved bits for OS */
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589 /* specific segment flags */
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590 #define PF_MASKPROC 0xf0000000 /* reserved bits for processor */
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591 /* specific segment flags */
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592
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593 // -------------------------------------------------------------------------
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594 /* Dynamic structure */
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595
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596 typedef struct {
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597 Elf32_Sword d_tag; /* controls meaning of d_val */
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598 union {
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599 Elf32_Word d_val; /* Multiple meanings - see d_tag */
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600 Elf32_Addr d_ptr; /* program virtual address */
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601 } d_un;
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602 } Elf32_Dyn;
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603
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604 extern Elf32_Dyn _DYNAMIC[]; /* XXX not 64-bit clean */
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605
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606 typedef struct {
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607 Elf64_Sxword d_tag; /* controls meaning of d_val */
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608 union {
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609 Elf64_Xword d_val;
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610 Elf64_Addr d_ptr;
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611 } d_un;
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612 } Elf64_Dyn;
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613
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614 // -------------------------------------------------------------------------
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615 /* Dynamic Array Tags - d_tag */
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616
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617 #define DT_NULL 0 /* marks end of _DYNAMIC array */
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618 #define DT_NEEDED 1 /* string table offset of needed lib */
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619 #define DT_PLTRELSZ 2 /* size of relocation entries in PLT */
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620 #define DT_PLTGOT 3 /* address PLT/GOT */
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621 #define DT_HASH 4 /* address of symbol hash table */
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622 #define DT_STRTAB 5 /* address of string table */
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623 #define DT_SYMTAB 6 /* address of symbol table */
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624 #define DT_RELA 7 /* address of relocation table */
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625 #define DT_RELASZ 8 /* size of relocation table */
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626 #define DT_RELAENT 9 /* size of relocation entry */
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627 #define DT_STRSZ 10 /* size of string table */
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628 #define DT_SYMENT 11 /* size of symbol table entry */
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629 #define DT_INIT 12 /* address of initialization func. */
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630 #define DT_FINI 13 /* address of termination function */
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631 #define DT_SONAME 14 /* string table offset of shared obj */
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632 #define DT_RPATH 15 /* string table offset of library
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633 search path */
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634 #define DT_SYMBOLIC 16 /* start sym search in shared obj. */
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635 #define DT_REL 17 /* address of rel. tbl. w addends */
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636 #define DT_RELSZ 18 /* size of DT_REL relocation table */
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637 #define DT_RELENT 19 /* size of DT_REL relocation entry */
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638 #define DT_PLTREL 20 /* PLT referenced relocation entry */
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639 #define DT_DEBUG 21 /* bugger */
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640 #define DT_TEXTREL 22 /* Allow rel. mod. to unwritable seg */
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641 #define DT_JMPREL 23 /* add. of PLT's relocation entries */
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642 #define DT_BIND_NOW 24 /* Bind now regardless of env setting */
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643 #define DT_INIT_ARRAY 25 /* init array address */
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644 #define DT_FINI_ARRAY 26 /* fini array address */
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645 #define DT_INIT_ARRAYSZ 27 /* init array size */
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646 #define DT_FINI_ARRAYSZ 28 /* fini array size */
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647 #define DT_RUNPATH 29 /* library search path */
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648 #define DT_FLAGS 30 /* flags */
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649 #define DT_ENCODING 32 /* encoding rules start here */
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650 #define DT_PREINIT_ARRAY 32 /* preinit array address */
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651 #define DT_PREINIT_ARRAYSZ 33 /* preinit array size */
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652 #define DT_NUM 26 /* Number used. */
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653 #define DT_LOOS 0x60000000 /* reserved range for OS */
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654 #define DT_HIOS 0x6fffffff /* specific dynamic array tags */
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655 #define DT_LOPROC 0x70000000 /* reserved range for processor */
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656 #define DT_HIPROC 0x7fffffff /* specific dynamic array tags */
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657
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658 // -------------------------------------------------------------------------
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659 // Values for DT_FLAGS entry
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660
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661 #define DF_ORIGIN 0x1 /* Uses $ORIGIN substitution string */
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662 #define DF_SYMBOLIC 0x2 /* search for symbols here first */
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663 #define DF_TEXTREL 0x4 /* text may be relocatable */
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664 #define DF_BIND_NOW 0x8 /* bind references now, dammit */
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665
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666 // -------------------------------------------------------------------------
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667 /* Note Definitions */
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668
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669 typedef struct {
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670 Elf32_Word namesz;
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671 Elf32_Word descsz;
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672 Elf32_Word type;
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673 } Elf32_Note;
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674
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675 typedef struct {
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676 Elf64_Word namesz;
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677 Elf64_Word descsz;
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678 Elf64_Word type;
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679 } Elf64_Note;
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680
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681 // -------------------------------------------------------------------------
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682 // Hash table structure
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683 // The same structure is used by both 32 and 64 bit formats
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684
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685 typedef struct {
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686 Elf32_Word nbucket; /* number of buckets */
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687 Elf32_Word nchain; /* number of chains */
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688
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689 /* The buckets follow this structure in memory and the chains
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690 follow those. */
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691 } Elf_Hash;
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692
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693 // -------------------------------------------------------------------------
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694 #endif // ifndef CYGONCE_LOADER_ELF_H
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695 // EOF elf.h