| 1 | // defstd.cc -- define standard symbols for gold. |
| 2 | |
| 3 | // Copyright (C) 2006-2019 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include "symtab.h" |
| 26 | #include "layout.h" |
| 27 | #include "defstd.h" |
| 28 | |
| 29 | // This is a simple file which defines the standard symbols like |
| 30 | // "_end". |
| 31 | |
| 32 | namespace |
| 33 | { |
| 34 | |
| 35 | using namespace gold; |
| 36 | |
| 37 | const Define_symbol_in_section in_section[] = |
| 38 | { |
| 39 | { |
| 40 | "__preinit_array_start", // name |
| 41 | ".preinit_array", // output_section |
| 42 | 0, // value |
| 43 | 0, // size |
| 44 | elfcpp::STT_NOTYPE, // type |
| 45 | elfcpp::STB_GLOBAL, // binding |
| 46 | elfcpp::STV_HIDDEN, // visibility |
| 47 | 0, // nonvis |
| 48 | false, // offset_is_from_end |
| 49 | true // only_if_ref |
| 50 | }, |
| 51 | { |
| 52 | "__preinit_array_end", // name |
| 53 | ".preinit_array", // output_section |
| 54 | 0, // value |
| 55 | 0, // size |
| 56 | elfcpp::STT_NOTYPE, // type |
| 57 | elfcpp::STB_GLOBAL, // binding |
| 58 | elfcpp::STV_HIDDEN, // visibility |
| 59 | 0, // nonvis |
| 60 | true, // offset_is_from_end |
| 61 | true // only_if_ref |
| 62 | }, |
| 63 | { |
| 64 | "__init_array_start", // name |
| 65 | ".init_array", // output_section |
| 66 | 0, // value |
| 67 | 0, // size |
| 68 | elfcpp::STT_NOTYPE, // type |
| 69 | elfcpp::STB_GLOBAL, // binding |
| 70 | elfcpp::STV_HIDDEN, // visibility |
| 71 | 0, // nonvis |
| 72 | false, // offset_is_from_end |
| 73 | true // only_if_ref |
| 74 | }, |
| 75 | { |
| 76 | "__init_array_end", // name |
| 77 | ".init_array", // output_section |
| 78 | 0, // value |
| 79 | 0, // size |
| 80 | elfcpp::STT_NOTYPE, // type |
| 81 | elfcpp::STB_GLOBAL, // binding |
| 82 | elfcpp::STV_HIDDEN, // visibility |
| 83 | 0, // nonvis |
| 84 | true, // offset_is_from_end |
| 85 | true // only_if_ref |
| 86 | }, |
| 87 | { |
| 88 | "__fini_array_start", // name |
| 89 | ".fini_array", // output_section |
| 90 | 0, // value |
| 91 | 0, // size |
| 92 | elfcpp::STT_NOTYPE, // type |
| 93 | elfcpp::STB_GLOBAL, // binding |
| 94 | elfcpp::STV_HIDDEN, // visibility |
| 95 | 0, // nonvis |
| 96 | false, // offset_is_from_end |
| 97 | true // only_if_ref |
| 98 | }, |
| 99 | { |
| 100 | "__fini_array_end", // name |
| 101 | ".fini_array", // output_section |
| 102 | 0, // value |
| 103 | 0, // size |
| 104 | elfcpp::STT_NOTYPE, // type |
| 105 | elfcpp::STB_GLOBAL, // binding |
| 106 | elfcpp::STV_HIDDEN, // visibility |
| 107 | 0, // nonvis |
| 108 | true, // offset_is_from_end |
| 109 | true // only_if_ref |
| 110 | }, |
| 111 | { |
| 112 | "__stack", // name |
| 113 | ".stack", // output_section |
| 114 | 0, // value |
| 115 | 0, // size |
| 116 | elfcpp::STT_NOTYPE, // type |
| 117 | elfcpp::STB_GLOBAL, // binding |
| 118 | elfcpp::STV_DEFAULT, // visibility |
| 119 | 0, // nonvis |
| 120 | false, // offset_is_from_end |
| 121 | true // only_if_ref |
| 122 | }, |
| 123 | }; |
| 124 | |
| 125 | const int in_section_count = sizeof in_section / sizeof in_section[0]; |
| 126 | |
| 127 | const Define_symbol_in_segment in_segment[] = |
| 128 | { |
| 129 | { |
| 130 | "__executable_start", // name |
| 131 | elfcpp::PT_LOAD, // segment_type |
| 132 | elfcpp::PF(0), // segment_flags_set |
| 133 | elfcpp::PF(0), // segment_flags_clear |
| 134 | 0, // value |
| 135 | 0, // size |
| 136 | elfcpp::STT_NOTYPE, // type |
| 137 | elfcpp::STB_GLOBAL, // binding |
| 138 | elfcpp::STV_DEFAULT, // visibility |
| 139 | 0, // nonvis |
| 140 | Symbol::SEGMENT_START, // offset_from_base |
| 141 | true // only_if_ref |
| 142 | }, |
| 143 | { |
| 144 | "__ehdr_start", // name |
| 145 | elfcpp::PT_LOAD, // segment_type |
| 146 | elfcpp::PF(0), // segment_flags_set |
| 147 | elfcpp::PF(0), // segment_flags_clear |
| 148 | 0, // value |
| 149 | 0, // size |
| 150 | elfcpp::STT_NOTYPE, // type |
| 151 | elfcpp::STB_GLOBAL, // binding |
| 152 | elfcpp::STV_HIDDEN, // visibility |
| 153 | 0, // nonvis |
| 154 | Symbol::SEGMENT_START, // offset_from_base |
| 155 | true // only_if_ref |
| 156 | }, |
| 157 | { |
| 158 | "etext", // name |
| 159 | elfcpp::PT_LOAD, // segment_type |
| 160 | elfcpp::PF_X, // segment_flags_set |
| 161 | elfcpp::PF_W, // segment_flags_clear |
| 162 | 0, // value |
| 163 | 0, // size |
| 164 | elfcpp::STT_NOTYPE, // type |
| 165 | elfcpp::STB_GLOBAL, // binding |
| 166 | elfcpp::STV_DEFAULT, // visibility |
| 167 | 0, // nonvis |
| 168 | Symbol::SEGMENT_END, // offset_from_base |
| 169 | true // only_if_ref |
| 170 | }, |
| 171 | { |
| 172 | "_etext", // name |
| 173 | elfcpp::PT_LOAD, // segment_type |
| 174 | elfcpp::PF_X, // segment_flags_set |
| 175 | elfcpp::PF_W, // segment_flags_clear |
| 176 | 0, // value |
| 177 | 0, // size |
| 178 | elfcpp::STT_NOTYPE, // type |
| 179 | elfcpp::STB_GLOBAL, // binding |
| 180 | elfcpp::STV_DEFAULT, // visibility |
| 181 | 0, // nonvis |
| 182 | Symbol::SEGMENT_END, // offset_from_base |
| 183 | true // only_if_ref |
| 184 | }, |
| 185 | { |
| 186 | "__etext", // name |
| 187 | elfcpp::PT_LOAD, // segment_type |
| 188 | elfcpp::PF_X, // segment_flags_set |
| 189 | elfcpp::PF_W, // segment_flags_clear |
| 190 | 0, // value |
| 191 | 0, // size |
| 192 | elfcpp::STT_NOTYPE, // type |
| 193 | elfcpp::STB_GLOBAL, // binding |
| 194 | elfcpp::STV_DEFAULT, // visibility |
| 195 | 0, // nonvis |
| 196 | Symbol::SEGMENT_END, // offset_from_base |
| 197 | true // only_if_ref |
| 198 | }, |
| 199 | { |
| 200 | "_edata", // name |
| 201 | elfcpp::PT_LOAD, // segment_type |
| 202 | elfcpp::PF_W, // segment_flags_set |
| 203 | elfcpp::PF(0), // segment_flags_clear |
| 204 | 0, // value |
| 205 | 0, // size |
| 206 | elfcpp::STT_NOTYPE, // type |
| 207 | elfcpp::STB_GLOBAL, // binding |
| 208 | elfcpp::STV_DEFAULT, // visibility |
| 209 | 0, // nonvis |
| 210 | Symbol::SEGMENT_BSS, // offset_from_base |
| 211 | false // only_if_ref |
| 212 | }, |
| 213 | { |
| 214 | "edata", // name |
| 215 | elfcpp::PT_LOAD, // segment_type |
| 216 | elfcpp::PF_W, // segment_flags_set |
| 217 | elfcpp::PF(0), // segment_flags_clear |
| 218 | 0, // value |
| 219 | 0, // size |
| 220 | elfcpp::STT_NOTYPE, // type |
| 221 | elfcpp::STB_GLOBAL, // binding |
| 222 | elfcpp::STV_DEFAULT, // visibility |
| 223 | 0, // nonvis |
| 224 | Symbol::SEGMENT_BSS, // offset_from_base |
| 225 | true // only_if_ref |
| 226 | }, |
| 227 | { |
| 228 | "__bss_start", // name |
| 229 | elfcpp::PT_LOAD, // segment_type |
| 230 | elfcpp::PF_W, // segment_flags_set |
| 231 | elfcpp::PF(0), // segment_flags_clear |
| 232 | 0, // value |
| 233 | 0, // size |
| 234 | elfcpp::STT_NOTYPE, // type |
| 235 | elfcpp::STB_GLOBAL, // binding |
| 236 | elfcpp::STV_DEFAULT, // visibility |
| 237 | 0, // nonvis |
| 238 | Symbol::SEGMENT_BSS, // offset_from_base |
| 239 | false // only_if_ref |
| 240 | }, |
| 241 | { |
| 242 | "_end", // name |
| 243 | elfcpp::PT_LOAD, // segment_type |
| 244 | elfcpp::PF_W, // segment_flags_set |
| 245 | elfcpp::PF(0), // segment_flags_clear |
| 246 | 0, // value |
| 247 | 0, // size |
| 248 | elfcpp::STT_NOTYPE, // type |
| 249 | elfcpp::STB_GLOBAL, // binding |
| 250 | elfcpp::STV_DEFAULT, // visibility |
| 251 | 0, // nonvis |
| 252 | Symbol::SEGMENT_END, // offset_from_base |
| 253 | false // only_if_ref |
| 254 | }, |
| 255 | { |
| 256 | "end", // name |
| 257 | elfcpp::PT_LOAD, // segment_type |
| 258 | elfcpp::PF_W, // segment_flags_set |
| 259 | elfcpp::PF(0), // segment_flags_clear |
| 260 | 0, // value |
| 261 | 0, // size |
| 262 | elfcpp::STT_NOTYPE, // type |
| 263 | elfcpp::STB_GLOBAL, // binding |
| 264 | elfcpp::STV_DEFAULT, // visibility |
| 265 | 0, // nonvis |
| 266 | Symbol::SEGMENT_END, // offset_from_base |
| 267 | true // only_if_ref |
| 268 | } |
| 269 | }; |
| 270 | |
| 271 | const int in_segment_count = sizeof in_segment / sizeof in_segment[0]; |
| 272 | |
| 273 | } // End anonymous namespace. |
| 274 | |
| 275 | namespace gold |
| 276 | { |
| 277 | |
| 278 | void |
| 279 | define_standard_symbols(Symbol_table* symtab, const Layout* layout) |
| 280 | { |
| 281 | bool saw_sections_clause = layout->script_options()->saw_sections_clause(); |
| 282 | symtab->define_symbols(layout, in_section_count, in_section, |
| 283 | saw_sections_clause); |
| 284 | symtab->define_symbols(layout, in_segment_count, in_segment, |
| 285 | saw_sections_clause); |
| 286 | } |
| 287 | |
| 288 | } // End namespace gold. |