[ec24a37] | 1 | /* |
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[977c3de] | 2 | * Copyright (c) 2011, Chris Johns <chrisj@rtems.org> |
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[ec24a37] | 3 | * |
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| 4 | * Permission to use, copy, modify, and/or distribute this software for any |
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| 5 | * purpose with or without fee is hereby granted, provided that the above |
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| 6 | * copyright notice and this permission notice appear in all copies. |
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[977c3de] | 7 | * |
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[ec24a37] | 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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| 11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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| 14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 15 | */ |
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| 16 | /** |
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| 17 | * @file |
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| 18 | * |
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| 19 | * @ingroup rtems-ld |
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| 20 | * |
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| 21 | * @brief RTEMS Linker ELF module manages the libelf interface. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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| 25 | #if !defined (_RLD_ELF_H_) |
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| 26 | #define _RLD_ELF_H_ |
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| 27 | |
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| 28 | #include <list> |
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| 29 | |
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| 30 | #include <rld.h> |
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| 31 | |
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| 32 | namespace rld |
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| 33 | { |
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| 34 | namespace elf |
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| 35 | { |
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| 36 | /** |
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[977c3de] | 37 | * Forward decl. |
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[ec24a37] | 38 | */ |
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[977c3de] | 39 | class file; |
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| 40 | |
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| 41 | /** |
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| 42 | * An ELF Section. |
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| 43 | */ |
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| 44 | class section |
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[ec24a37] | 45 | { |
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[977c3de] | 46 | public: |
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| 47 | /** |
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| 48 | * Construct the section getting the details. |
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| 49 | * |
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| 50 | * @param elf The ELF file this section is part of. |
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| 51 | * @param index The sections index in the ELF file. |
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| 52 | */ |
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| 53 | section (file& file_, int index); |
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| 54 | |
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[ec24a37] | 55 | /** |
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[977c3de] | 56 | * Copy constructor. |
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[ec24a37] | 57 | */ |
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[977c3de] | 58 | section (const section& orig); |
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[ec24a37] | 59 | |
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| 60 | /** |
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| 61 | * Default constructor. |
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| 62 | */ |
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| 63 | section (); |
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[977c3de] | 64 | |
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| 65 | /** |
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| 66 | * The section's index in the ELF file. |
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| 67 | * |
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| 68 | * @return int The section number. |
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| 69 | */ |
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| 70 | int index () const; |
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| 71 | |
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| 72 | /** |
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| 73 | * The name of the section. |
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| 74 | * |
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| 75 | * @return const std::string& The section's name. |
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| 76 | */ |
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| 77 | const std::string& name () const; |
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| 78 | |
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| 79 | /** |
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| 80 | * The section's data. |
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| 81 | */ |
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| 82 | elf_data* data (); |
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| 83 | |
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| 84 | /** |
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| 85 | * Get the type of the section. |
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| 86 | */ |
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| 87 | elf_word type () const; |
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| 88 | |
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| 89 | /** |
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| 90 | * The section flags. |
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| 91 | */ |
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| 92 | elf_xword flags () const; |
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| 93 | |
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| 94 | /** |
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| 95 | * In-memory address of the section. |
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| 96 | */ |
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| 97 | elf_addr address () const; |
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| 98 | |
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| 99 | /** |
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| 100 | * Alignment constraint. |
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| 101 | */ |
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| 102 | elf_xword alignment () const; |
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| 103 | |
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| 104 | /** |
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| 105 | * The file offset of the section. |
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| 106 | */ |
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| 107 | elf_off offset () const; |
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| 108 | |
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| 109 | /** |
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| 110 | * The header table link. |
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| 111 | */ |
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| 112 | elf_word link () const; |
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| 113 | |
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| 114 | /** |
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| 115 | * Extra information. |
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| 116 | */ |
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| 117 | elf_word info () const; |
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| 118 | |
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| 119 | /** |
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| 120 | * Size of the section. |
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| 121 | */ |
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| 122 | elf_xword size () const; |
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| 123 | |
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| 124 | /** |
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| 125 | * Size of the entries in the section. |
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| 126 | */ |
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| 127 | elf_xword entry_size () const; |
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| 128 | |
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| 129 | /** |
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| 130 | * Number of entries. |
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| 131 | */ |
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| 132 | int entries () const; |
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| 133 | |
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| 134 | private: |
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| 135 | |
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| 136 | /** |
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| 137 | * Check the section is acrtual valid. |
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| 138 | */ |
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| 139 | void check () const; |
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| 140 | |
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| 141 | file* file_; //< The ELF file. |
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| 142 | int index_; //< The section header index. |
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| 143 | std::string name_; //< The section's name. |
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| 144 | elf_scn* scn; //< ELF private section data. |
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| 145 | elf_shdr shdr; //< The section header. |
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| 146 | elf_data* data_; //< The section's data. |
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[ec24a37] | 147 | }; |
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| 148 | |
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| 149 | /** |
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[977c3de] | 150 | * Container of ELF sections. |
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[ec24a37] | 151 | */ |
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| 152 | typedef std::list < section > sections; |
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| 153 | |
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| 154 | /** |
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[977c3de] | 155 | * An ELF file. |
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[ec24a37] | 156 | */ |
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[977c3de] | 157 | class file |
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| 158 | { |
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| 159 | public: |
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| 160 | /** |
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| 161 | * Construct an ELF file. |
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| 162 | */ |
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| 163 | file (); |
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[ec24a37] | 164 | |
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[977c3de] | 165 | /** |
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| 166 | * Destruct the ELF file object. |
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| 167 | */ |
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| 168 | ~file (); |
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[ec24a37] | 169 | |
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[977c3de] | 170 | /** |
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| 171 | * Begin using the ELF file. |
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| 172 | * |
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| 173 | * @param name The full name of the file. |
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| 174 | * @param fd The file descriptor to read or write the file. |
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| 175 | * @param writable The file is writeable. The default is false. |
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| 176 | */ |
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| 177 | void begin (const std::string& name, int fd, const bool writable = false); |
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[ec24a37] | 178 | |
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[977c3de] | 179 | /** |
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| 180 | * Begin using the ELF file in an archive. |
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| 181 | * |
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| 182 | * @param name The full name of the file. |
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| 183 | * @param archive The file that is the archive. |
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| 184 | * @param offset The offset of the ELF file in the archive. |
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| 185 | */ |
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| 186 | void begin (const std::string& name, file& archive, off_t offset); |
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| 187 | |
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| 188 | /** |
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| 189 | * End using the ELF file. |
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| 190 | */ |
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| 191 | void end (); |
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| 192 | |
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| 193 | /** |
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| 194 | * Load the header. Done automatically. |
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| 195 | */ |
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| 196 | void load_header (); |
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| 197 | |
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| 198 | /** |
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| 199 | * Get the machine type. |
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| 200 | */ |
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| 201 | unsigned int machinetype () const; |
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| 202 | |
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| 203 | /** |
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| 204 | * Get the type of ELF file. |
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| 205 | */ |
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| 206 | unsigned int type () const; |
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| 207 | |
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| 208 | /** |
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| 209 | * Get the class of the object file. |
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| 210 | */ |
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| 211 | unsigned int object_class () const; |
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| 212 | |
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| 213 | /** |
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| 214 | * Get the data type, ie LSB or MSB. |
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| 215 | */ |
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| 216 | unsigned int data_type () const; |
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| 217 | |
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| 218 | /** |
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| 219 | * Is the file an archive format file ? |
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| 220 | */ |
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| 221 | bool is_archive () const; |
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| 222 | |
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| 223 | /** |
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| 224 | * Is the file an executable ? |
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| 225 | */ |
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| 226 | bool is_executable () const; |
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| 227 | |
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| 228 | /** |
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| 229 | * Is the file relocatable ? |
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| 230 | */ |
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| 231 | bool is_relocatable() const; |
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| 232 | |
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| 233 | /** |
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| 234 | * The number of sections in the file. |
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| 235 | */ |
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| 236 | int section_count () const; |
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| 237 | |
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| 238 | /** |
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| 239 | * Load the sections. |
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| 240 | */ |
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| 241 | void load_sections (); |
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| 242 | |
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| 243 | /** |
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| 244 | * Get a filtered container of the sections. The key is the section |
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| 245 | * type. If the sections are not loaded they are loaded. If the type is 0 |
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| 246 | * all sections are returned. |
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| 247 | * |
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| 248 | * @param filtered_secs The container the copy of the filtered sections |
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| 249 | * are placed in. |
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| 250 | * @param type The type of sections to filter on. If 0 all sections are |
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| 251 | * matched. |
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| 252 | */ |
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| 253 | void get_sections (sections& filtered_secs, unsigned int type); |
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| 254 | |
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| 255 | /** |
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| 256 | * Return the index of the string section. |
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| 257 | */ |
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| 258 | int strings_section () const; |
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| 259 | |
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| 260 | /** |
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| 261 | * Get the string from the specified section at the requested offset. |
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| 262 | * |
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| 263 | * @param section The section to search for the string. |
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| 264 | * @param offset The offset in the string section. |
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| 265 | * @return std::string The string. |
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| 266 | */ |
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| 267 | std::string get_string (int section, size_t offset); |
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| 268 | |
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| 269 | /** |
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| 270 | * Get the string from the ELF header declared string section at the |
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| 271 | * requested offset. |
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| 272 | * |
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| 273 | * @param offset The offset in the string section. |
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| 274 | * @return std::string The string. |
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| 275 | */ |
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| 276 | std::string get_string (size_t offset); |
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| 277 | |
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| 278 | /** |
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| 279 | * Load the symbols. |
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| 280 | */ |
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| 281 | void load_symbols (); |
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| 282 | |
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| 283 | /** |
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| 284 | * Get a filtered container of symbols given the various types. If the |
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| 285 | * symbols are not loaded they are loaded. |
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| 286 | * |
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| 287 | * @param filter_syms The filtered symbols found in the file. This is a |
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| 288 | * container of pointers. |
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| 289 | * @param local Return local symbols. |
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| 290 | * @param weak Return weak symbols. |
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| 291 | * @param global Return global symbols. |
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| 292 | * @param unresolved Return unresolved symbols. |
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| 293 | */ |
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| 294 | void get_symbols (rld::symbols::pointers& filtered_syms, |
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| 295 | bool unresolved = false, |
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| 296 | bool local = false, |
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| 297 | bool weak = true, |
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| 298 | bool global = true); |
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| 299 | |
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| 300 | /** |
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| 301 | * Get the ELF reference. |
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| 302 | */ |
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| 303 | elf* get_elf (); |
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| 304 | |
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| 305 | /** |
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| 306 | * Get the name of the file. |
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| 307 | */ |
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| 308 | const std::string& name () const; |
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| 309 | |
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| 310 | /** |
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| 311 | * Is the file writable ? |
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| 312 | */ |
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| 313 | bool is_writable () const; |
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| 314 | |
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| 315 | private: |
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| 316 | |
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| 317 | /** |
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| 318 | * Begin using the ELF file. |
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| 319 | * |
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| 320 | * @param name The full name of the file. |
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| 321 | * @param fd The file descriptor to read or write the file. |
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| 322 | * @param writable The file is writeable. It cannot be part of an archive. |
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| 323 | * @param archive The archive's ELF handle or 0 if not an archive. |
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| 324 | * @param offset The offset of the ELF file in the archive if elf is non-zero. |
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| 325 | */ |
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| 326 | void begin (const std::string& name, |
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| 327 | int fd, |
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| 328 | const bool writable, |
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| 329 | file* archive, |
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| 330 | off_t offset); |
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| 331 | |
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| 332 | /** |
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| 333 | * Check if the file is usable. Throw an exception if not. |
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| 334 | * |
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| 335 | * @param where Where the check is performed. |
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| 336 | */ |
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| 337 | void check (const char* where) const; |
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| 338 | |
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| 339 | /** |
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| 340 | * Check if the file is usable and writable. Throw an exception if not. |
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| 341 | * |
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| 342 | * @param where Where the check is performed. |
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| 343 | */ |
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| 344 | void check_writable (const char* where) const; |
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| 345 | |
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| 346 | /** |
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| 347 | * Generate libelf error. |
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| 348 | * |
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| 349 | * @param where Where the error is generated. |
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| 350 | */ |
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| 351 | void error (const char* where) const; |
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| 352 | |
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| 353 | int fd_; //< The file handle. |
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| 354 | std::string name_; //< The name of the file. |
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| 355 | bool archive; //< The ELF file is part of an archive. |
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| 356 | bool writable; //< The file is writeable. |
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| 357 | elf* elf_; //< The ELF handle. |
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| 358 | unsigned int mtype; //< The machine type. |
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| 359 | unsigned int oclass; //< The object class. |
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| 360 | const char* ident_str; //< The ELF file's ident string. |
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| 361 | size_t ident_size; //< The size of the ident. |
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| 362 | elf_ehdr ehdr; //< The ELF header. |
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| 363 | elf_phdr phdr; //< The ELF program header. |
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| 364 | std::string stab; //< The string table. |
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| 365 | sections secs; //< The sections. |
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| 366 | rld::symbols::bucket symbols; //< The symbols. All tables point here. |
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| 367 | }; |
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[ec24a37] | 368 | |
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| 369 | /** |
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[977c3de] | 370 | * Return the machine type label given the machine type. |
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| 371 | * |
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| 372 | * @param machinetype The ELF machine type. |
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[ec24a37] | 373 | */ |
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[977c3de] | 374 | const std::string machine_type (unsigned int machinetype); |
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| 375 | |
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[ec24a37] | 376 | /** |
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[977c3de] | 377 | * Return the global machine type set by the check_file call. |
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[ec24a37] | 378 | */ |
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[977c3de] | 379 | const std::string machine_type (); |
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[ec24a37] | 380 | |
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| 381 | /** |
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[977c3de] | 382 | * Check the file against the global machine type, object class and data |
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| 383 | * type. If this is the first file checked it becomes the default all |
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| 384 | * others are checked against. This is a simple way to make sure all files |
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| 385 | * are the same type. |
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| 386 | * |
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| 387 | * @param file The check to check. |
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[ec24a37] | 388 | */ |
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[977c3de] | 389 | void check_file(const file& file); |
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| 390 | |
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[ec24a37] | 391 | } |
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| 392 | } |
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| 393 | |
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| 394 | #endif |
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