| 1 | // output.h -- manage the output file for gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011 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 | #ifndef GOLD_OUTPUT_H |
| 24 | #define GOLD_OUTPUT_H |
| 25 | |
| 26 | #include <list> |
| 27 | #include <vector> |
| 28 | |
| 29 | #include "elfcpp.h" |
| 30 | #include "mapfile.h" |
| 31 | #include "layout.h" |
| 32 | #include "reloc-types.h" |
| 33 | |
| 34 | namespace gold |
| 35 | { |
| 36 | |
| 37 | class General_options; |
| 38 | class Object; |
| 39 | class Symbol; |
| 40 | class Output_file; |
| 41 | class Output_merge_base; |
| 42 | class Output_section; |
| 43 | class Relocatable_relocs; |
| 44 | class Target; |
| 45 | template<int size, bool big_endian> |
| 46 | class Sized_target; |
| 47 | template<int size, bool big_endian> |
| 48 | class Sized_relobj; |
| 49 | template<int size, bool big_endian> |
| 50 | class Sized_relobj_file; |
| 51 | |
| 52 | // An abtract class for data which has to go into the output file. |
| 53 | |
| 54 | class Output_data |
| 55 | { |
| 56 | public: |
| 57 | explicit Output_data() |
| 58 | : address_(0), data_size_(0), offset_(-1), |
| 59 | is_address_valid_(false), is_data_size_valid_(false), |
| 60 | is_offset_valid_(false), is_data_size_fixed_(false), |
| 61 | has_dynamic_reloc_(false) |
| 62 | { } |
| 63 | |
| 64 | virtual |
| 65 | ~Output_data(); |
| 66 | |
| 67 | // Return the address. For allocated sections, this is only valid |
| 68 | // after Layout::finalize is finished. |
| 69 | uint64_t |
| 70 | address() const |
| 71 | { |
| 72 | gold_assert(this->is_address_valid_); |
| 73 | return this->address_; |
| 74 | } |
| 75 | |
| 76 | // Return the size of the data. For allocated sections, this must |
| 77 | // be valid after Layout::finalize calls set_address, but need not |
| 78 | // be valid before then. |
| 79 | off_t |
| 80 | data_size() const |
| 81 | { |
| 82 | gold_assert(this->is_data_size_valid_); |
| 83 | return this->data_size_; |
| 84 | } |
| 85 | |
| 86 | // Get the current data size. |
| 87 | off_t |
| 88 | current_data_size() const |
| 89 | { return this->current_data_size_for_child(); } |
| 90 | |
| 91 | // Return true if data size is fixed. |
| 92 | bool |
| 93 | is_data_size_fixed() const |
| 94 | { return this->is_data_size_fixed_; } |
| 95 | |
| 96 | // Return the file offset. This is only valid after |
| 97 | // Layout::finalize is finished. For some non-allocated sections, |
| 98 | // it may not be valid until near the end of the link. |
| 99 | off_t |
| 100 | offset() const |
| 101 | { |
| 102 | gold_assert(this->is_offset_valid_); |
| 103 | return this->offset_; |
| 104 | } |
| 105 | |
| 106 | // Reset the address and file offset. This essentially disables the |
| 107 | // sanity testing about duplicate and unknown settings. |
| 108 | void |
| 109 | reset_address_and_file_offset() |
| 110 | { |
| 111 | this->is_address_valid_ = false; |
| 112 | this->is_offset_valid_ = false; |
| 113 | if (!this->is_data_size_fixed_) |
| 114 | this->is_data_size_valid_ = false; |
| 115 | this->do_reset_address_and_file_offset(); |
| 116 | } |
| 117 | |
| 118 | // Return true if address and file offset already have reset values. In |
| 119 | // other words, calling reset_address_and_file_offset will not change them. |
| 120 | bool |
| 121 | address_and_file_offset_have_reset_values() const |
| 122 | { return this->do_address_and_file_offset_have_reset_values(); } |
| 123 | |
| 124 | // Return the required alignment. |
| 125 | uint64_t |
| 126 | addralign() const |
| 127 | { return this->do_addralign(); } |
| 128 | |
| 129 | // Return whether this has a load address. |
| 130 | bool |
| 131 | has_load_address() const |
| 132 | { return this->do_has_load_address(); } |
| 133 | |
| 134 | // Return the load address. |
| 135 | uint64_t |
| 136 | load_address() const |
| 137 | { return this->do_load_address(); } |
| 138 | |
| 139 | // Return whether this is an Output_section. |
| 140 | bool |
| 141 | is_section() const |
| 142 | { return this->do_is_section(); } |
| 143 | |
| 144 | // Return whether this is an Output_section of the specified type. |
| 145 | bool |
| 146 | is_section_type(elfcpp::Elf_Word stt) const |
| 147 | { return this->do_is_section_type(stt); } |
| 148 | |
| 149 | // Return whether this is an Output_section with the specified flag |
| 150 | // set. |
| 151 | bool |
| 152 | is_section_flag_set(elfcpp::Elf_Xword shf) const |
| 153 | { return this->do_is_section_flag_set(shf); } |
| 154 | |
| 155 | // Return the output section that this goes in, if there is one. |
| 156 | Output_section* |
| 157 | output_section() |
| 158 | { return this->do_output_section(); } |
| 159 | |
| 160 | const Output_section* |
| 161 | output_section() const |
| 162 | { return this->do_output_section(); } |
| 163 | |
| 164 | // Return the output section index, if there is an output section. |
| 165 | unsigned int |
| 166 | out_shndx() const |
| 167 | { return this->do_out_shndx(); } |
| 168 | |
| 169 | // Set the output section index, if this is an output section. |
| 170 | void |
| 171 | set_out_shndx(unsigned int shndx) |
| 172 | { this->do_set_out_shndx(shndx); } |
| 173 | |
| 174 | // Set the address and file offset of this data, and finalize the |
| 175 | // size of the data. This is called during Layout::finalize for |
| 176 | // allocated sections. |
| 177 | void |
| 178 | set_address_and_file_offset(uint64_t addr, off_t off) |
| 179 | { |
| 180 | this->set_address(addr); |
| 181 | this->set_file_offset(off); |
| 182 | this->finalize_data_size(); |
| 183 | } |
| 184 | |
| 185 | // Set the address. |
| 186 | void |
| 187 | set_address(uint64_t addr) |
| 188 | { |
| 189 | gold_assert(!this->is_address_valid_); |
| 190 | this->address_ = addr; |
| 191 | this->is_address_valid_ = true; |
| 192 | } |
| 193 | |
| 194 | // Set the file offset. |
| 195 | void |
| 196 | set_file_offset(off_t off) |
| 197 | { |
| 198 | gold_assert(!this->is_offset_valid_); |
| 199 | this->offset_ = off; |
| 200 | this->is_offset_valid_ = true; |
| 201 | } |
| 202 | |
| 203 | // Update the data size without finalizing it. |
| 204 | void |
| 205 | pre_finalize_data_size() |
| 206 | { |
| 207 | if (!this->is_data_size_valid_) |
| 208 | { |
| 209 | // Tell the child class to update the data size. |
| 210 | this->update_data_size(); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | // Finalize the data size. |
| 215 | void |
| 216 | finalize_data_size() |
| 217 | { |
| 218 | if (!this->is_data_size_valid_) |
| 219 | { |
| 220 | // Tell the child class to set the data size. |
| 221 | this->set_final_data_size(); |
| 222 | gold_assert(this->is_data_size_valid_); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | // Set the TLS offset. Called only for SHT_TLS sections. |
| 227 | void |
| 228 | set_tls_offset(uint64_t tls_base) |
| 229 | { this->do_set_tls_offset(tls_base); } |
| 230 | |
| 231 | // Return the TLS offset, relative to the base of the TLS segment. |
| 232 | // Valid only for SHT_TLS sections. |
| 233 | uint64_t |
| 234 | tls_offset() const |
| 235 | { return this->do_tls_offset(); } |
| 236 | |
| 237 | // Write the data to the output file. This is called after |
| 238 | // Layout::finalize is complete. |
| 239 | void |
| 240 | write(Output_file* file) |
| 241 | { this->do_write(file); } |
| 242 | |
| 243 | // This is called by Layout::finalize to note that the sizes of |
| 244 | // allocated sections must now be fixed. |
| 245 | static void |
| 246 | layout_complete() |
| 247 | { Output_data::allocated_sizes_are_fixed = true; } |
| 248 | |
| 249 | // Used to check that layout has been done. |
| 250 | static bool |
| 251 | is_layout_complete() |
| 252 | { return Output_data::allocated_sizes_are_fixed; } |
| 253 | |
| 254 | // Note that a dynamic reloc has been applied to this data. |
| 255 | void |
| 256 | add_dynamic_reloc() |
| 257 | { this->has_dynamic_reloc_ = true; } |
| 258 | |
| 259 | // Return whether a dynamic reloc has been applied. |
| 260 | bool |
| 261 | has_dynamic_reloc() const |
| 262 | { return this->has_dynamic_reloc_; } |
| 263 | |
| 264 | // Whether the address is valid. |
| 265 | bool |
| 266 | is_address_valid() const |
| 267 | { return this->is_address_valid_; } |
| 268 | |
| 269 | // Whether the file offset is valid. |
| 270 | bool |
| 271 | is_offset_valid() const |
| 272 | { return this->is_offset_valid_; } |
| 273 | |
| 274 | // Whether the data size is valid. |
| 275 | bool |
| 276 | is_data_size_valid() const |
| 277 | { return this->is_data_size_valid_; } |
| 278 | |
| 279 | // Print information to the map file. |
| 280 | void |
| 281 | print_to_mapfile(Mapfile* mapfile) const |
| 282 | { return this->do_print_to_mapfile(mapfile); } |
| 283 | |
| 284 | protected: |
| 285 | // Functions that child classes may or in some cases must implement. |
| 286 | |
| 287 | // Write the data to the output file. |
| 288 | virtual void |
| 289 | do_write(Output_file*) = 0; |
| 290 | |
| 291 | // Return the required alignment. |
| 292 | virtual uint64_t |
| 293 | do_addralign() const = 0; |
| 294 | |
| 295 | // Return whether this has a load address. |
| 296 | virtual bool |
| 297 | do_has_load_address() const |
| 298 | { return false; } |
| 299 | |
| 300 | // Return the load address. |
| 301 | virtual uint64_t |
| 302 | do_load_address() const |
| 303 | { gold_unreachable(); } |
| 304 | |
| 305 | // Return whether this is an Output_section. |
| 306 | virtual bool |
| 307 | do_is_section() const |
| 308 | { return false; } |
| 309 | |
| 310 | // Return whether this is an Output_section of the specified type. |
| 311 | // This only needs to be implement by Output_section. |
| 312 | virtual bool |
| 313 | do_is_section_type(elfcpp::Elf_Word) const |
| 314 | { return false; } |
| 315 | |
| 316 | // Return whether this is an Output_section with the specific flag |
| 317 | // set. This only needs to be implemented by Output_section. |
| 318 | virtual bool |
| 319 | do_is_section_flag_set(elfcpp::Elf_Xword) const |
| 320 | { return false; } |
| 321 | |
| 322 | // Return the output section, if there is one. |
| 323 | virtual Output_section* |
| 324 | do_output_section() |
| 325 | { return NULL; } |
| 326 | |
| 327 | virtual const Output_section* |
| 328 | do_output_section() const |
| 329 | { return NULL; } |
| 330 | |
| 331 | // Return the output section index, if there is an output section. |
| 332 | virtual unsigned int |
| 333 | do_out_shndx() const |
| 334 | { gold_unreachable(); } |
| 335 | |
| 336 | // Set the output section index, if this is an output section. |
| 337 | virtual void |
| 338 | do_set_out_shndx(unsigned int) |
| 339 | { gold_unreachable(); } |
| 340 | |
| 341 | // This is a hook for derived classes to set the preliminary data size. |
| 342 | // This is called by pre_finalize_data_size, normally called during |
| 343 | // Layout::finalize, before the section address is set, and is used |
| 344 | // during an incremental update, when we need to know the size of a |
| 345 | // section before allocating space in the output file. For classes |
| 346 | // where the current data size is up to date, this default version of |
| 347 | // the method can be inherited. |
| 348 | virtual void |
| 349 | update_data_size() |
| 350 | { } |
| 351 | |
| 352 | // This is a hook for derived classes to set the data size. This is |
| 353 | // called by finalize_data_size, normally called during |
| 354 | // Layout::finalize, when the section address is set. |
| 355 | virtual void |
| 356 | set_final_data_size() |
| 357 | { gold_unreachable(); } |
| 358 | |
| 359 | // A hook for resetting the address and file offset. |
| 360 | virtual void |
| 361 | do_reset_address_and_file_offset() |
| 362 | { } |
| 363 | |
| 364 | // Return true if address and file offset already have reset values. In |
| 365 | // other words, calling reset_address_and_file_offset will not change them. |
| 366 | // A child class overriding do_reset_address_and_file_offset may need to |
| 367 | // also override this. |
| 368 | virtual bool |
| 369 | do_address_and_file_offset_have_reset_values() const |
| 370 | { return !this->is_address_valid_ && !this->is_offset_valid_; } |
| 371 | |
| 372 | // Set the TLS offset. Called only for SHT_TLS sections. |
| 373 | virtual void |
| 374 | do_set_tls_offset(uint64_t) |
| 375 | { gold_unreachable(); } |
| 376 | |
| 377 | // Return the TLS offset, relative to the base of the TLS segment. |
| 378 | // Valid only for SHT_TLS sections. |
| 379 | virtual uint64_t |
| 380 | do_tls_offset() const |
| 381 | { gold_unreachable(); } |
| 382 | |
| 383 | // Print to the map file. This only needs to be implemented by |
| 384 | // classes which may appear in a PT_LOAD segment. |
| 385 | virtual void |
| 386 | do_print_to_mapfile(Mapfile*) const |
| 387 | { gold_unreachable(); } |
| 388 | |
| 389 | // Functions that child classes may call. |
| 390 | |
| 391 | // Reset the address. The Output_section class needs this when an |
| 392 | // SHF_ALLOC input section is added to an output section which was |
| 393 | // formerly not SHF_ALLOC. |
| 394 | void |
| 395 | mark_address_invalid() |
| 396 | { this->is_address_valid_ = false; } |
| 397 | |
| 398 | // Set the size of the data. |
| 399 | void |
| 400 | set_data_size(off_t data_size) |
| 401 | { |
| 402 | gold_assert(!this->is_data_size_valid_ |
| 403 | && !this->is_data_size_fixed_); |
| 404 | this->data_size_ = data_size; |
| 405 | this->is_data_size_valid_ = true; |
| 406 | } |
| 407 | |
| 408 | // Fix the data size. Once it is fixed, it cannot be changed |
| 409 | // and the data size remains always valid. |
| 410 | void |
| 411 | fix_data_size() |
| 412 | { |
| 413 | gold_assert(this->is_data_size_valid_); |
| 414 | this->is_data_size_fixed_ = true; |
| 415 | } |
| 416 | |
| 417 | // Get the current data size--this is for the convenience of |
| 418 | // sections which build up their size over time. |
| 419 | off_t |
| 420 | current_data_size_for_child() const |
| 421 | { return this->data_size_; } |
| 422 | |
| 423 | // Set the current data size--this is for the convenience of |
| 424 | // sections which build up their size over time. |
| 425 | void |
| 426 | set_current_data_size_for_child(off_t data_size) |
| 427 | { |
| 428 | gold_assert(!this->is_data_size_valid_); |
| 429 | this->data_size_ = data_size; |
| 430 | } |
| 431 | |
| 432 | // Return default alignment for the target size. |
| 433 | static uint64_t |
| 434 | default_alignment(); |
| 435 | |
| 436 | // Return default alignment for a specified size--32 or 64. |
| 437 | static uint64_t |
| 438 | default_alignment_for_size(int size); |
| 439 | |
| 440 | private: |
| 441 | Output_data(const Output_data&); |
| 442 | Output_data& operator=(const Output_data&); |
| 443 | |
| 444 | // This is used for verification, to make sure that we don't try to |
| 445 | // change any sizes of allocated sections after we set the section |
| 446 | // addresses. |
| 447 | static bool allocated_sizes_are_fixed; |
| 448 | |
| 449 | // Memory address in output file. |
| 450 | uint64_t address_; |
| 451 | // Size of data in output file. |
| 452 | off_t data_size_; |
| 453 | // File offset of contents in output file. |
| 454 | off_t offset_; |
| 455 | // Whether address_ is valid. |
| 456 | bool is_address_valid_ : 1; |
| 457 | // Whether data_size_ is valid. |
| 458 | bool is_data_size_valid_ : 1; |
| 459 | // Whether offset_ is valid. |
| 460 | bool is_offset_valid_ : 1; |
| 461 | // Whether data size is fixed. |
| 462 | bool is_data_size_fixed_ : 1; |
| 463 | // Whether any dynamic relocs have been applied to this section. |
| 464 | bool has_dynamic_reloc_ : 1; |
| 465 | }; |
| 466 | |
| 467 | // Output the section headers. |
| 468 | |
| 469 | class Output_section_headers : public Output_data |
| 470 | { |
| 471 | public: |
| 472 | Output_section_headers(const Layout*, |
| 473 | const Layout::Segment_list*, |
| 474 | const Layout::Section_list*, |
| 475 | const Layout::Section_list*, |
| 476 | const Stringpool*, |
| 477 | const Output_section*); |
| 478 | |
| 479 | protected: |
| 480 | // Write the data to the file. |
| 481 | void |
| 482 | do_write(Output_file*); |
| 483 | |
| 484 | // Return the required alignment. |
| 485 | uint64_t |
| 486 | do_addralign() const |
| 487 | { return Output_data::default_alignment(); } |
| 488 | |
| 489 | // Write to a map file. |
| 490 | void |
| 491 | do_print_to_mapfile(Mapfile* mapfile) const |
| 492 | { mapfile->print_output_data(this, _("** section headers")); } |
| 493 | |
| 494 | // Update the data size. |
| 495 | void |
| 496 | update_data_size() |
| 497 | { this->set_data_size(this->do_size()); } |
| 498 | |
| 499 | // Set final data size. |
| 500 | void |
| 501 | set_final_data_size() |
| 502 | { this->set_data_size(this->do_size()); } |
| 503 | |
| 504 | private: |
| 505 | // Write the data to the file with the right size and endianness. |
| 506 | template<int size, bool big_endian> |
| 507 | void |
| 508 | do_sized_write(Output_file*); |
| 509 | |
| 510 | // Compute data size. |
| 511 | off_t |
| 512 | do_size() const; |
| 513 | |
| 514 | const Layout* layout_; |
| 515 | const Layout::Segment_list* segment_list_; |
| 516 | const Layout::Section_list* section_list_; |
| 517 | const Layout::Section_list* unattached_section_list_; |
| 518 | const Stringpool* secnamepool_; |
| 519 | const Output_section* shstrtab_section_; |
| 520 | }; |
| 521 | |
| 522 | // Output the segment headers. |
| 523 | |
| 524 | class Output_segment_headers : public Output_data |
| 525 | { |
| 526 | public: |
| 527 | Output_segment_headers(const Layout::Segment_list& segment_list); |
| 528 | |
| 529 | protected: |
| 530 | // Write the data to the file. |
| 531 | void |
| 532 | do_write(Output_file*); |
| 533 | |
| 534 | // Return the required alignment. |
| 535 | uint64_t |
| 536 | do_addralign() const |
| 537 | { return Output_data::default_alignment(); } |
| 538 | |
| 539 | // Write to a map file. |
| 540 | void |
| 541 | do_print_to_mapfile(Mapfile* mapfile) const |
| 542 | { mapfile->print_output_data(this, _("** segment headers")); } |
| 543 | |
| 544 | // Set final data size. |
| 545 | void |
| 546 | set_final_data_size() |
| 547 | { this->set_data_size(this->do_size()); } |
| 548 | |
| 549 | private: |
| 550 | // Write the data to the file with the right size and endianness. |
| 551 | template<int size, bool big_endian> |
| 552 | void |
| 553 | do_sized_write(Output_file*); |
| 554 | |
| 555 | // Compute the current size. |
| 556 | off_t |
| 557 | do_size() const; |
| 558 | |
| 559 | const Layout::Segment_list& segment_list_; |
| 560 | }; |
| 561 | |
| 562 | // Output the ELF file header. |
| 563 | |
| 564 | class Output_file_header : public Output_data |
| 565 | { |
| 566 | public: |
| 567 | Output_file_header(const Target*, |
| 568 | const Symbol_table*, |
| 569 | const Output_segment_headers*); |
| 570 | |
| 571 | // Add information about the section headers. We lay out the ELF |
| 572 | // file header before we create the section headers. |
| 573 | void set_section_info(const Output_section_headers*, |
| 574 | const Output_section* shstrtab); |
| 575 | |
| 576 | protected: |
| 577 | // Write the data to the file. |
| 578 | void |
| 579 | do_write(Output_file*); |
| 580 | |
| 581 | // Return the required alignment. |
| 582 | uint64_t |
| 583 | do_addralign() const |
| 584 | { return Output_data::default_alignment(); } |
| 585 | |
| 586 | // Write to a map file. |
| 587 | void |
| 588 | do_print_to_mapfile(Mapfile* mapfile) const |
| 589 | { mapfile->print_output_data(this, _("** file header")); } |
| 590 | |
| 591 | // Set final data size. |
| 592 | void |
| 593 | set_final_data_size(void) |
| 594 | { this->set_data_size(this->do_size()); } |
| 595 | |
| 596 | private: |
| 597 | // Write the data to the file with the right size and endianness. |
| 598 | template<int size, bool big_endian> |
| 599 | void |
| 600 | do_sized_write(Output_file*); |
| 601 | |
| 602 | // Return the value to use for the entry address. |
| 603 | template<int size> |
| 604 | typename elfcpp::Elf_types<size>::Elf_Addr |
| 605 | entry(); |
| 606 | |
| 607 | // Compute the current data size. |
| 608 | off_t |
| 609 | do_size() const; |
| 610 | |
| 611 | const Target* target_; |
| 612 | const Symbol_table* symtab_; |
| 613 | const Output_segment_headers* segment_header_; |
| 614 | const Output_section_headers* section_header_; |
| 615 | const Output_section* shstrtab_; |
| 616 | }; |
| 617 | |
| 618 | // Output sections are mainly comprised of input sections. However, |
| 619 | // there are cases where we have data to write out which is not in an |
| 620 | // input section. Output_section_data is used in such cases. This is |
| 621 | // an abstract base class. |
| 622 | |
| 623 | class Output_section_data : public Output_data |
| 624 | { |
| 625 | public: |
| 626 | Output_section_data(off_t data_size, uint64_t addralign, |
| 627 | bool is_data_size_fixed) |
| 628 | : Output_data(), output_section_(NULL), addralign_(addralign) |
| 629 | { |
| 630 | this->set_data_size(data_size); |
| 631 | if (is_data_size_fixed) |
| 632 | this->fix_data_size(); |
| 633 | } |
| 634 | |
| 635 | Output_section_data(uint64_t addralign) |
| 636 | : Output_data(), output_section_(NULL), addralign_(addralign) |
| 637 | { } |
| 638 | |
| 639 | // Return the output section. |
| 640 | Output_section* |
| 641 | output_section() |
| 642 | { return this->output_section_; } |
| 643 | |
| 644 | const Output_section* |
| 645 | output_section() const |
| 646 | { return this->output_section_; } |
| 647 | |
| 648 | // Record the output section. |
| 649 | void |
| 650 | set_output_section(Output_section* os); |
| 651 | |
| 652 | // Add an input section, for SHF_MERGE sections. This returns true |
| 653 | // if the section was handled. |
| 654 | bool |
| 655 | add_input_section(Relobj* object, unsigned int shndx) |
| 656 | { return this->do_add_input_section(object, shndx); } |
| 657 | |
| 658 | // Given an input OBJECT, an input section index SHNDX within that |
| 659 | // object, and an OFFSET relative to the start of that input |
| 660 | // section, return whether or not the corresponding offset within |
| 661 | // the output section is known. If this function returns true, it |
| 662 | // sets *POUTPUT to the output offset. The value -1 indicates that |
| 663 | // this input offset is being discarded. |
| 664 | bool |
| 665 | output_offset(const Relobj* object, unsigned int shndx, |
| 666 | section_offset_type offset, |
| 667 | section_offset_type* poutput) const |
| 668 | { return this->do_output_offset(object, shndx, offset, poutput); } |
| 669 | |
| 670 | // Return whether this is the merge section for the input section |
| 671 | // SHNDX in OBJECT. This should return true when output_offset |
| 672 | // would return true for some values of OFFSET. |
| 673 | bool |
| 674 | is_merge_section_for(const Relobj* object, unsigned int shndx) const |
| 675 | { return this->do_is_merge_section_for(object, shndx); } |
| 676 | |
| 677 | // Write the contents to a buffer. This is used for sections which |
| 678 | // require postprocessing, such as compression. |
| 679 | void |
| 680 | write_to_buffer(unsigned char* buffer) |
| 681 | { this->do_write_to_buffer(buffer); } |
| 682 | |
| 683 | // Print merge stats to stderr. This should only be called for |
| 684 | // SHF_MERGE sections. |
| 685 | void |
| 686 | print_merge_stats(const char* section_name) |
| 687 | { this->do_print_merge_stats(section_name); } |
| 688 | |
| 689 | protected: |
| 690 | // The child class must implement do_write. |
| 691 | |
| 692 | // The child class may implement specific adjustments to the output |
| 693 | // section. |
| 694 | virtual void |
| 695 | do_adjust_output_section(Output_section*) |
| 696 | { } |
| 697 | |
| 698 | // May be implemented by child class. Return true if the section |
| 699 | // was handled. |
| 700 | virtual bool |
| 701 | do_add_input_section(Relobj*, unsigned int) |
| 702 | { gold_unreachable(); } |
| 703 | |
| 704 | // The child class may implement output_offset. |
| 705 | virtual bool |
| 706 | do_output_offset(const Relobj*, unsigned int, section_offset_type, |
| 707 | section_offset_type*) const |
| 708 | { return false; } |
| 709 | |
| 710 | // The child class may implement is_merge_section_for. |
| 711 | virtual bool |
| 712 | do_is_merge_section_for(const Relobj*, unsigned int) const |
| 713 | { return false; } |
| 714 | |
| 715 | // The child class may implement write_to_buffer. Most child |
| 716 | // classes can not appear in a compressed section, and they do not |
| 717 | // implement this. |
| 718 | virtual void |
| 719 | do_write_to_buffer(unsigned char*) |
| 720 | { gold_unreachable(); } |
| 721 | |
| 722 | // Print merge statistics. |
| 723 | virtual void |
| 724 | do_print_merge_stats(const char*) |
| 725 | { gold_unreachable(); } |
| 726 | |
| 727 | // Return the required alignment. |
| 728 | uint64_t |
| 729 | do_addralign() const |
| 730 | { return this->addralign_; } |
| 731 | |
| 732 | // Return the output section. |
| 733 | Output_section* |
| 734 | do_output_section() |
| 735 | { return this->output_section_; } |
| 736 | |
| 737 | const Output_section* |
| 738 | do_output_section() const |
| 739 | { return this->output_section_; } |
| 740 | |
| 741 | // Return the section index of the output section. |
| 742 | unsigned int |
| 743 | do_out_shndx() const; |
| 744 | |
| 745 | // Set the alignment. |
| 746 | void |
| 747 | set_addralign(uint64_t addralign); |
| 748 | |
| 749 | private: |
| 750 | // The output section for this section. |
| 751 | Output_section* output_section_; |
| 752 | // The required alignment. |
| 753 | uint64_t addralign_; |
| 754 | }; |
| 755 | |
| 756 | // Some Output_section_data classes build up their data step by step, |
| 757 | // rather than all at once. This class provides an interface for |
| 758 | // them. |
| 759 | |
| 760 | class Output_section_data_build : public Output_section_data |
| 761 | { |
| 762 | public: |
| 763 | Output_section_data_build(uint64_t addralign) |
| 764 | : Output_section_data(addralign) |
| 765 | { } |
| 766 | |
| 767 | Output_section_data_build(off_t data_size, uint64_t addralign) |
| 768 | : Output_section_data(data_size, addralign, false) |
| 769 | { } |
| 770 | |
| 771 | // Set the current data size. |
| 772 | void |
| 773 | set_current_data_size(off_t data_size) |
| 774 | { this->set_current_data_size_for_child(data_size); } |
| 775 | |
| 776 | protected: |
| 777 | // Set the final data size. |
| 778 | virtual void |
| 779 | set_final_data_size() |
| 780 | { this->set_data_size(this->current_data_size_for_child()); } |
| 781 | }; |
| 782 | |
| 783 | // A simple case of Output_data in which we have constant data to |
| 784 | // output. |
| 785 | |
| 786 | class Output_data_const : public Output_section_data |
| 787 | { |
| 788 | public: |
| 789 | Output_data_const(const std::string& data, uint64_t addralign) |
| 790 | : Output_section_data(data.size(), addralign, true), data_(data) |
| 791 | { } |
| 792 | |
| 793 | Output_data_const(const char* p, off_t len, uint64_t addralign) |
| 794 | : Output_section_data(len, addralign, true), data_(p, len) |
| 795 | { } |
| 796 | |
| 797 | Output_data_const(const unsigned char* p, off_t len, uint64_t addralign) |
| 798 | : Output_section_data(len, addralign, true), |
| 799 | data_(reinterpret_cast<const char*>(p), len) |
| 800 | { } |
| 801 | |
| 802 | protected: |
| 803 | // Write the data to the output file. |
| 804 | void |
| 805 | do_write(Output_file*); |
| 806 | |
| 807 | // Write the data to a buffer. |
| 808 | void |
| 809 | do_write_to_buffer(unsigned char* buffer) |
| 810 | { memcpy(buffer, this->data_.data(), this->data_.size()); } |
| 811 | |
| 812 | // Write to a map file. |
| 813 | void |
| 814 | do_print_to_mapfile(Mapfile* mapfile) const |
| 815 | { mapfile->print_output_data(this, _("** fill")); } |
| 816 | |
| 817 | private: |
| 818 | std::string data_; |
| 819 | }; |
| 820 | |
| 821 | // Another version of Output_data with constant data, in which the |
| 822 | // buffer is allocated by the caller. |
| 823 | |
| 824 | class Output_data_const_buffer : public Output_section_data |
| 825 | { |
| 826 | public: |
| 827 | Output_data_const_buffer(const unsigned char* p, off_t len, |
| 828 | uint64_t addralign, const char* map_name) |
| 829 | : Output_section_data(len, addralign, true), |
| 830 | p_(p), map_name_(map_name) |
| 831 | { } |
| 832 | |
| 833 | protected: |
| 834 | // Write the data the output file. |
| 835 | void |
| 836 | do_write(Output_file*); |
| 837 | |
| 838 | // Write the data to a buffer. |
| 839 | void |
| 840 | do_write_to_buffer(unsigned char* buffer) |
| 841 | { memcpy(buffer, this->p_, this->data_size()); } |
| 842 | |
| 843 | // Write to a map file. |
| 844 | void |
| 845 | do_print_to_mapfile(Mapfile* mapfile) const |
| 846 | { mapfile->print_output_data(this, _(this->map_name_)); } |
| 847 | |
| 848 | private: |
| 849 | // The data to output. |
| 850 | const unsigned char* p_; |
| 851 | // Name to use in a map file. Maps are a rarely used feature, but |
| 852 | // the space usage is minor as aren't very many of these objects. |
| 853 | const char* map_name_; |
| 854 | }; |
| 855 | |
| 856 | // A place holder for a fixed amount of data written out via some |
| 857 | // other mechanism. |
| 858 | |
| 859 | class Output_data_fixed_space : public Output_section_data |
| 860 | { |
| 861 | public: |
| 862 | Output_data_fixed_space(off_t data_size, uint64_t addralign, |
| 863 | const char* map_name) |
| 864 | : Output_section_data(data_size, addralign, true), |
| 865 | map_name_(map_name) |
| 866 | { } |
| 867 | |
| 868 | protected: |
| 869 | // Write out the data--the actual data must be written out |
| 870 | // elsewhere. |
| 871 | void |
| 872 | do_write(Output_file*) |
| 873 | { } |
| 874 | |
| 875 | // Write to a map file. |
| 876 | void |
| 877 | do_print_to_mapfile(Mapfile* mapfile) const |
| 878 | { mapfile->print_output_data(this, _(this->map_name_)); } |
| 879 | |
| 880 | private: |
| 881 | // Name to use in a map file. Maps are a rarely used feature, but |
| 882 | // the space usage is minor as aren't very many of these objects. |
| 883 | const char* map_name_; |
| 884 | }; |
| 885 | |
| 886 | // A place holder for variable sized data written out via some other |
| 887 | // mechanism. |
| 888 | |
| 889 | class Output_data_space : public Output_section_data_build |
| 890 | { |
| 891 | public: |
| 892 | explicit Output_data_space(uint64_t addralign, const char* map_name) |
| 893 | : Output_section_data_build(addralign), |
| 894 | map_name_(map_name) |
| 895 | { } |
| 896 | |
| 897 | explicit Output_data_space(off_t data_size, uint64_t addralign, |
| 898 | const char* map_name) |
| 899 | : Output_section_data_build(data_size, addralign), |
| 900 | map_name_(map_name) |
| 901 | { } |
| 902 | |
| 903 | // Set the alignment. |
| 904 | void |
| 905 | set_space_alignment(uint64_t align) |
| 906 | { this->set_addralign(align); } |
| 907 | |
| 908 | protected: |
| 909 | // Write out the data--the actual data must be written out |
| 910 | // elsewhere. |
| 911 | void |
| 912 | do_write(Output_file*) |
| 913 | { } |
| 914 | |
| 915 | // Write to a map file. |
| 916 | void |
| 917 | do_print_to_mapfile(Mapfile* mapfile) const |
| 918 | { mapfile->print_output_data(this, _(this->map_name_)); } |
| 919 | |
| 920 | private: |
| 921 | // Name to use in a map file. Maps are a rarely used feature, but |
| 922 | // the space usage is minor as aren't very many of these objects. |
| 923 | const char* map_name_; |
| 924 | }; |
| 925 | |
| 926 | // Fill fixed space with zeroes. This is just like |
| 927 | // Output_data_fixed_space, except that the map name is known. |
| 928 | |
| 929 | class Output_data_zero_fill : public Output_section_data |
| 930 | { |
| 931 | public: |
| 932 | Output_data_zero_fill(off_t data_size, uint64_t addralign) |
| 933 | : Output_section_data(data_size, addralign, true) |
| 934 | { } |
| 935 | |
| 936 | protected: |
| 937 | // There is no data to write out. |
| 938 | void |
| 939 | do_write(Output_file*) |
| 940 | { } |
| 941 | |
| 942 | // Write to a map file. |
| 943 | void |
| 944 | do_print_to_mapfile(Mapfile* mapfile) const |
| 945 | { mapfile->print_output_data(this, "** zero fill"); } |
| 946 | }; |
| 947 | |
| 948 | // A string table which goes into an output section. |
| 949 | |
| 950 | class Output_data_strtab : public Output_section_data |
| 951 | { |
| 952 | public: |
| 953 | Output_data_strtab(Stringpool* strtab) |
| 954 | : Output_section_data(1), strtab_(strtab) |
| 955 | { } |
| 956 | |
| 957 | protected: |
| 958 | // This is called to update the section size prior to assigning |
| 959 | // the address and file offset. |
| 960 | void |
| 961 | update_data_size() |
| 962 | { this->set_final_data_size(); } |
| 963 | |
| 964 | // This is called to set the address and file offset. Here we make |
| 965 | // sure that the Stringpool is finalized. |
| 966 | void |
| 967 | set_final_data_size(); |
| 968 | |
| 969 | // Write out the data. |
| 970 | void |
| 971 | do_write(Output_file*); |
| 972 | |
| 973 | // Write the data to a buffer. |
| 974 | void |
| 975 | do_write_to_buffer(unsigned char* buffer) |
| 976 | { this->strtab_->write_to_buffer(buffer, this->data_size()); } |
| 977 | |
| 978 | // Write to a map file. |
| 979 | void |
| 980 | do_print_to_mapfile(Mapfile* mapfile) const |
| 981 | { mapfile->print_output_data(this, _("** string table")); } |
| 982 | |
| 983 | private: |
| 984 | Stringpool* strtab_; |
| 985 | }; |
| 986 | |
| 987 | // This POD class is used to represent a single reloc in the output |
| 988 | // file. This could be a private class within Output_data_reloc, but |
| 989 | // the templatization is complex enough that I broke it out into a |
| 990 | // separate class. The class is templatized on either elfcpp::SHT_REL |
| 991 | // or elfcpp::SHT_RELA, and also on whether this is a dynamic |
| 992 | // relocation or an ordinary relocation. |
| 993 | |
| 994 | // A relocation can be against a global symbol, a local symbol, a |
| 995 | // local section symbol, an output section, or the undefined symbol at |
| 996 | // index 0. We represent the latter by using a NULL global symbol. |
| 997 | |
| 998 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 999 | class Output_reloc; |
| 1000 | |
| 1001 | template<bool dynamic, int size, bool big_endian> |
| 1002 | class Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> |
| 1003 | { |
| 1004 | public: |
| 1005 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1006 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; |
| 1007 | |
| 1008 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 1009 | |
| 1010 | // An uninitialized entry. We need this because we want to put |
| 1011 | // instances of this class into an STL container. |
| 1012 | Output_reloc() |
| 1013 | : local_sym_index_(INVALID_CODE) |
| 1014 | { } |
| 1015 | |
| 1016 | // We have a bunch of different constructors. They come in pairs |
| 1017 | // depending on how the address of the relocation is specified. It |
| 1018 | // can either be an offset in an Output_data or an offset in an |
| 1019 | // input section. |
| 1020 | |
| 1021 | // A reloc against a global symbol. |
| 1022 | |
| 1023 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
| 1024 | Address address, bool is_relative, bool is_symbolless, |
| 1025 | bool use_plt_offset); |
| 1026 | |
| 1027 | Output_reloc(Symbol* gsym, unsigned int type, |
| 1028 | Sized_relobj<size, big_endian>* relobj, |
| 1029 | unsigned int shndx, Address address, bool is_relative, |
| 1030 | bool is_symbolless, bool use_plt_offset); |
| 1031 | |
| 1032 | // A reloc against a local symbol or local section symbol. |
| 1033 | |
| 1034 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 1035 | unsigned int local_sym_index, unsigned int type, |
| 1036 | Output_data* od, Address address, bool is_relative, |
| 1037 | bool is_symbolless, bool is_section_symbol, |
| 1038 | bool use_plt_offset); |
| 1039 | |
| 1040 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 1041 | unsigned int local_sym_index, unsigned int type, |
| 1042 | unsigned int shndx, Address address, bool is_relative, |
| 1043 | bool is_symbolless, bool is_section_symbol, |
| 1044 | bool use_plt_offset); |
| 1045 | |
| 1046 | // A reloc against the STT_SECTION symbol of an output section. |
| 1047 | |
| 1048 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
| 1049 | Address address); |
| 1050 | |
| 1051 | Output_reloc(Output_section* os, unsigned int type, |
| 1052 | Sized_relobj<size, big_endian>* relobj, |
| 1053 | unsigned int shndx, Address address); |
| 1054 | |
| 1055 | // An absolute relocation with no symbol. |
| 1056 | |
| 1057 | Output_reloc(unsigned int type, Output_data* od, Address address); |
| 1058 | |
| 1059 | Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj, |
| 1060 | unsigned int shndx, Address address); |
| 1061 | |
| 1062 | // A target specific relocation. The target will be called to get |
| 1063 | // the symbol index, passing ARG. The type and offset will be set |
| 1064 | // as for other relocation types. |
| 1065 | |
| 1066 | Output_reloc(unsigned int type, void* arg, Output_data* od, |
| 1067 | Address address); |
| 1068 | |
| 1069 | Output_reloc(unsigned int type, void* arg, |
| 1070 | Sized_relobj<size, big_endian>* relobj, |
| 1071 | unsigned int shndx, Address address); |
| 1072 | |
| 1073 | // Return the reloc type. |
| 1074 | unsigned int |
| 1075 | type() const |
| 1076 | { return this->type_; } |
| 1077 | |
| 1078 | // Return whether this is a RELATIVE relocation. |
| 1079 | bool |
| 1080 | is_relative() const |
| 1081 | { return this->is_relative_; } |
| 1082 | |
| 1083 | // Return whether this is a relocation which should not use |
| 1084 | // a symbol, but which obtains its addend from a symbol. |
| 1085 | bool |
| 1086 | is_symbolless() const |
| 1087 | { return this->is_symbolless_; } |
| 1088 | |
| 1089 | // Return whether this is against a local section symbol. |
| 1090 | bool |
| 1091 | is_local_section_symbol() const |
| 1092 | { |
| 1093 | return (this->local_sym_index_ != GSYM_CODE |
| 1094 | && this->local_sym_index_ != SECTION_CODE |
| 1095 | && this->local_sym_index_ != INVALID_CODE |
| 1096 | && this->local_sym_index_ != TARGET_CODE |
| 1097 | && this->is_section_symbol_); |
| 1098 | } |
| 1099 | |
| 1100 | // Return whether this is a target specific relocation. |
| 1101 | bool |
| 1102 | is_target_specific() const |
| 1103 | { return this->local_sym_index_ == TARGET_CODE; } |
| 1104 | |
| 1105 | // Return the argument to pass to the target for a target specific |
| 1106 | // relocation. |
| 1107 | void* |
| 1108 | target_arg() const |
| 1109 | { |
| 1110 | gold_assert(this->local_sym_index_ == TARGET_CODE); |
| 1111 | return this->u1_.arg; |
| 1112 | } |
| 1113 | |
| 1114 | // For a local section symbol, return the offset of the input |
| 1115 | // section within the output section. ADDEND is the addend being |
| 1116 | // applied to the input section. |
| 1117 | Address |
| 1118 | local_section_offset(Addend addend) const; |
| 1119 | |
| 1120 | // Get the value of the symbol referred to by a Rel relocation when |
| 1121 | // we are adding the given ADDEND. |
| 1122 | Address |
| 1123 | symbol_value(Addend addend) const; |
| 1124 | |
| 1125 | // If this relocation is against an input section, return the |
| 1126 | // relocatable object containing the input section. |
| 1127 | Sized_relobj<size, big_endian>* |
| 1128 | get_relobj() const |
| 1129 | { |
| 1130 | if (this->shndx_ == INVALID_CODE) |
| 1131 | return NULL; |
| 1132 | return this->u2_.relobj; |
| 1133 | } |
| 1134 | |
| 1135 | // Write the reloc entry to an output view. |
| 1136 | void |
| 1137 | write(unsigned char* pov) const; |
| 1138 | |
| 1139 | // Write the offset and info fields to Write_rel. |
| 1140 | template<typename Write_rel> |
| 1141 | void write_rel(Write_rel*) const; |
| 1142 | |
| 1143 | // This is used when sorting dynamic relocs. Return -1 to sort this |
| 1144 | // reloc before R2, 0 to sort the same as R2, 1 to sort after R2. |
| 1145 | int |
| 1146 | compare(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& r2) |
| 1147 | const; |
| 1148 | |
| 1149 | // Return whether this reloc should be sorted before the argument |
| 1150 | // when sorting dynamic relocs. |
| 1151 | bool |
| 1152 | sort_before(const Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>& |
| 1153 | r2) const |
| 1154 | { return this->compare(r2) < 0; } |
| 1155 | |
| 1156 | private: |
| 1157 | // Record that we need a dynamic symbol index. |
| 1158 | void |
| 1159 | set_needs_dynsym_index(); |
| 1160 | |
| 1161 | // Return the symbol index. |
| 1162 | unsigned int |
| 1163 | get_symbol_index() const; |
| 1164 | |
| 1165 | // Return the output address. |
| 1166 | Address |
| 1167 | get_address() const; |
| 1168 | |
| 1169 | // Codes for local_sym_index_. |
| 1170 | enum |
| 1171 | { |
| 1172 | // Global symbol. |
| 1173 | GSYM_CODE = -1U, |
| 1174 | // Output section. |
| 1175 | SECTION_CODE = -2U, |
| 1176 | // Target specific. |
| 1177 | TARGET_CODE = -3U, |
| 1178 | // Invalid uninitialized entry. |
| 1179 | INVALID_CODE = -4U |
| 1180 | }; |
| 1181 | |
| 1182 | union |
| 1183 | { |
| 1184 | // For a local symbol or local section symbol |
| 1185 | // (this->local_sym_index_ >= 0), the object. We will never |
| 1186 | // generate a relocation against a local symbol in a dynamic |
| 1187 | // object; that doesn't make sense. And our callers will always |
| 1188 | // be templatized, so we use Sized_relobj here. |
| 1189 | Sized_relobj<size, big_endian>* relobj; |
| 1190 | // For a global symbol (this->local_sym_index_ == GSYM_CODE, the |
| 1191 | // symbol. If this is NULL, it indicates a relocation against the |
| 1192 | // undefined 0 symbol. |
| 1193 | Symbol* gsym; |
| 1194 | // For a relocation against an output section |
| 1195 | // (this->local_sym_index_ == SECTION_CODE), the output section. |
| 1196 | Output_section* os; |
| 1197 | // For a target specific relocation, an argument to pass to the |
| 1198 | // target. |
| 1199 | void* arg; |
| 1200 | } u1_; |
| 1201 | union |
| 1202 | { |
| 1203 | // If this->shndx_ is not INVALID CODE, the object which holds the |
| 1204 | // input section being used to specify the reloc address. |
| 1205 | Sized_relobj<size, big_endian>* relobj; |
| 1206 | // If this->shndx_ is INVALID_CODE, the output data being used to |
| 1207 | // specify the reloc address. This may be NULL if the reloc |
| 1208 | // address is absolute. |
| 1209 | Output_data* od; |
| 1210 | } u2_; |
| 1211 | // The address offset within the input section or the Output_data. |
| 1212 | Address address_; |
| 1213 | // This is GSYM_CODE for a global symbol, or SECTION_CODE for a |
| 1214 | // relocation against an output section, or TARGET_CODE for a target |
| 1215 | // specific relocation, or INVALID_CODE for an uninitialized value. |
| 1216 | // Otherwise, for a local symbol (this->is_section_symbol_ is |
| 1217 | // false), the local symbol index. For a local section symbol |
| 1218 | // (this->is_section_symbol_ is true), the section index in the |
| 1219 | // input file. |
| 1220 | unsigned int local_sym_index_; |
| 1221 | // The reloc type--a processor specific code. |
| 1222 | unsigned int type_ : 28; |
| 1223 | // True if the relocation is a RELATIVE relocation. |
| 1224 | bool is_relative_ : 1; |
| 1225 | // True if the relocation is one which should not use |
| 1226 | // a symbol, but which obtains its addend from a symbol. |
| 1227 | bool is_symbolless_ : 1; |
| 1228 | // True if the relocation is against a section symbol. |
| 1229 | bool is_section_symbol_ : 1; |
| 1230 | // True if the addend should be the PLT offset. |
| 1231 | // (Used only for RELA, but stored here for space.) |
| 1232 | bool use_plt_offset_ : 1; |
| 1233 | // If the reloc address is an input section in an object, the |
| 1234 | // section index. This is INVALID_CODE if the reloc address is |
| 1235 | // specified in some other way. |
| 1236 | unsigned int shndx_; |
| 1237 | }; |
| 1238 | |
| 1239 | // The SHT_RELA version of Output_reloc<>. This is just derived from |
| 1240 | // the SHT_REL version of Output_reloc, but it adds an addend. |
| 1241 | |
| 1242 | template<bool dynamic, int size, bool big_endian> |
| 1243 | class Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> |
| 1244 | { |
| 1245 | public: |
| 1246 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1247 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; |
| 1248 | |
| 1249 | // An uninitialized entry. |
| 1250 | Output_reloc() |
| 1251 | : rel_() |
| 1252 | { } |
| 1253 | |
| 1254 | // A reloc against a global symbol. |
| 1255 | |
| 1256 | Output_reloc(Symbol* gsym, unsigned int type, Output_data* od, |
| 1257 | Address address, Addend addend, bool is_relative, |
| 1258 | bool is_symbolless, bool use_plt_offset) |
| 1259 | : rel_(gsym, type, od, address, is_relative, is_symbolless, |
| 1260 | use_plt_offset), |
| 1261 | addend_(addend) |
| 1262 | { } |
| 1263 | |
| 1264 | Output_reloc(Symbol* gsym, unsigned int type, |
| 1265 | Sized_relobj<size, big_endian>* relobj, |
| 1266 | unsigned int shndx, Address address, Addend addend, |
| 1267 | bool is_relative, bool is_symbolless, bool use_plt_offset) |
| 1268 | : rel_(gsym, type, relobj, shndx, address, is_relative, |
| 1269 | is_symbolless, use_plt_offset), addend_(addend) |
| 1270 | { } |
| 1271 | |
| 1272 | // A reloc against a local symbol. |
| 1273 | |
| 1274 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 1275 | unsigned int local_sym_index, unsigned int type, |
| 1276 | Output_data* od, Address address, |
| 1277 | Addend addend, bool is_relative, |
| 1278 | bool is_symbolless, bool is_section_symbol, |
| 1279 | bool use_plt_offset) |
| 1280 | : rel_(relobj, local_sym_index, type, od, address, is_relative, |
| 1281 | is_symbolless, is_section_symbol, use_plt_offset), |
| 1282 | addend_(addend) |
| 1283 | { } |
| 1284 | |
| 1285 | Output_reloc(Sized_relobj<size, big_endian>* relobj, |
| 1286 | unsigned int local_sym_index, unsigned int type, |
| 1287 | unsigned int shndx, Address address, |
| 1288 | Addend addend, bool is_relative, |
| 1289 | bool is_symbolless, bool is_section_symbol, |
| 1290 | bool use_plt_offset) |
| 1291 | : rel_(relobj, local_sym_index, type, shndx, address, is_relative, |
| 1292 | is_symbolless, is_section_symbol, use_plt_offset), |
| 1293 | addend_(addend) |
| 1294 | { } |
| 1295 | |
| 1296 | // A reloc against the STT_SECTION symbol of an output section. |
| 1297 | |
| 1298 | Output_reloc(Output_section* os, unsigned int type, Output_data* od, |
| 1299 | Address address, Addend addend) |
| 1300 | : rel_(os, type, od, address), addend_(addend) |
| 1301 | { } |
| 1302 | |
| 1303 | Output_reloc(Output_section* os, unsigned int type, |
| 1304 | Sized_relobj<size, big_endian>* relobj, |
| 1305 | unsigned int shndx, Address address, Addend addend) |
| 1306 | : rel_(os, type, relobj, shndx, address), addend_(addend) |
| 1307 | { } |
| 1308 | |
| 1309 | // An absolute relocation with no symbol. |
| 1310 | |
| 1311 | Output_reloc(unsigned int type, Output_data* od, Address address, |
| 1312 | Addend addend) |
| 1313 | : rel_(type, od, address), addend_(addend) |
| 1314 | { } |
| 1315 | |
| 1316 | Output_reloc(unsigned int type, Sized_relobj<size, big_endian>* relobj, |
| 1317 | unsigned int shndx, Address address, Addend addend) |
| 1318 | : rel_(type, relobj, shndx, address), addend_(addend) |
| 1319 | { } |
| 1320 | |
| 1321 | // A target specific relocation. The target will be called to get |
| 1322 | // the symbol index and the addend, passing ARG. The type and |
| 1323 | // offset will be set as for other relocation types. |
| 1324 | |
| 1325 | Output_reloc(unsigned int type, void* arg, Output_data* od, |
| 1326 | Address address, Addend addend) |
| 1327 | : rel_(type, arg, od, address), addend_(addend) |
| 1328 | { } |
| 1329 | |
| 1330 | Output_reloc(unsigned int type, void* arg, |
| 1331 | Sized_relobj<size, big_endian>* relobj, |
| 1332 | unsigned int shndx, Address address, Addend addend) |
| 1333 | : rel_(type, arg, relobj, shndx, address), addend_(addend) |
| 1334 | { } |
| 1335 | |
| 1336 | // Return whether this is a RELATIVE relocation. |
| 1337 | bool |
| 1338 | is_relative() const |
| 1339 | { return this->rel_.is_relative(); } |
| 1340 | |
| 1341 | // Return whether this is a relocation which should not use |
| 1342 | // a symbol, but which obtains its addend from a symbol. |
| 1343 | bool |
| 1344 | is_symbolless() const |
| 1345 | { return this->rel_.is_symbolless(); } |
| 1346 | |
| 1347 | // If this relocation is against an input section, return the |
| 1348 | // relocatable object containing the input section. |
| 1349 | Sized_relobj<size, big_endian>* |
| 1350 | get_relobj() const |
| 1351 | { return this->rel_.get_relobj(); } |
| 1352 | |
| 1353 | // Write the reloc entry to an output view. |
| 1354 | void |
| 1355 | write(unsigned char* pov) const; |
| 1356 | |
| 1357 | // Return whether this reloc should be sorted before the argument |
| 1358 | // when sorting dynamic relocs. |
| 1359 | bool |
| 1360 | sort_before(const Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>& |
| 1361 | r2) const |
| 1362 | { |
| 1363 | int i = this->rel_.compare(r2.rel_); |
| 1364 | if (i < 0) |
| 1365 | return true; |
| 1366 | else if (i > 0) |
| 1367 | return false; |
| 1368 | else |
| 1369 | return this->addend_ < r2.addend_; |
| 1370 | } |
| 1371 | |
| 1372 | private: |
| 1373 | // The basic reloc. |
| 1374 | Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> rel_; |
| 1375 | // The addend. |
| 1376 | Addend addend_; |
| 1377 | }; |
| 1378 | |
| 1379 | // Output_data_reloc_generic is a non-template base class for |
| 1380 | // Output_data_reloc_base. This gives the generic code a way to hold |
| 1381 | // a pointer to a reloc section. |
| 1382 | |
| 1383 | class Output_data_reloc_generic : public Output_section_data_build |
| 1384 | { |
| 1385 | public: |
| 1386 | Output_data_reloc_generic(int size, bool sort_relocs) |
| 1387 | : Output_section_data_build(Output_data::default_alignment_for_size(size)), |
| 1388 | relative_reloc_count_(0), sort_relocs_(sort_relocs) |
| 1389 | { } |
| 1390 | |
| 1391 | // Return the number of relative relocs in this section. |
| 1392 | size_t |
| 1393 | relative_reloc_count() const |
| 1394 | { return this->relative_reloc_count_; } |
| 1395 | |
| 1396 | // Whether we should sort the relocs. |
| 1397 | bool |
| 1398 | sort_relocs() const |
| 1399 | { return this->sort_relocs_; } |
| 1400 | |
| 1401 | // Add a reloc of type TYPE against the global symbol GSYM. The |
| 1402 | // relocation applies to the data at offset ADDRESS within OD. |
| 1403 | virtual void |
| 1404 | add_global_generic(Symbol* gsym, unsigned int type, Output_data* od, |
| 1405 | uint64_t address, uint64_t addend) = 0; |
| 1406 | |
| 1407 | // Add a reloc of type TYPE against the global symbol GSYM. The |
| 1408 | // relocation applies to data at offset ADDRESS within section SHNDX |
| 1409 | // of object file RELOBJ. OD is the associated output section. |
| 1410 | virtual void |
| 1411 | add_global_generic(Symbol* gsym, unsigned int type, Output_data* od, |
| 1412 | Relobj* relobj, unsigned int shndx, uint64_t address, |
| 1413 | uint64_t addend) = 0; |
| 1414 | |
| 1415 | // Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX |
| 1416 | // in RELOBJ. The relocation applies to the data at offset ADDRESS |
| 1417 | // within OD. |
| 1418 | virtual void |
| 1419 | add_local_generic(Relobj* relobj, unsigned int local_sym_index, |
| 1420 | unsigned int type, Output_data* od, uint64_t address, |
| 1421 | uint64_t addend) = 0; |
| 1422 | |
| 1423 | // Add a reloc of type TYPE against the local symbol LOCAL_SYM_INDEX |
| 1424 | // in RELOBJ. The relocation applies to the data at offset ADDRESS |
| 1425 | // within section SHNDX of RELOBJ. OD is the associated output |
| 1426 | // section. |
| 1427 | virtual void |
| 1428 | add_local_generic(Relobj* relobj, unsigned int local_sym_index, |
| 1429 | unsigned int type, Output_data* od, unsigned int shndx, |
| 1430 | uint64_t address, uint64_t addend) = 0; |
| 1431 | |
| 1432 | // Add a reloc of type TYPE against the STT_SECTION symbol of the |
| 1433 | // output section OS. The relocation applies to the data at offset |
| 1434 | // ADDRESS within OD. |
| 1435 | virtual void |
| 1436 | add_output_section_generic(Output_section *os, unsigned int type, |
| 1437 | Output_data* od, uint64_t address, |
| 1438 | uint64_t addend) = 0; |
| 1439 | |
| 1440 | // Add a reloc of type TYPE against the STT_SECTION symbol of the |
| 1441 | // output section OS. The relocation applies to the data at offset |
| 1442 | // ADDRESS within section SHNDX of RELOBJ. OD is the associated |
| 1443 | // output section. |
| 1444 | virtual void |
| 1445 | add_output_section_generic(Output_section* os, unsigned int type, |
| 1446 | Output_data* od, Relobj* relobj, |
| 1447 | unsigned int shndx, uint64_t address, |
| 1448 | uint64_t addend) = 0; |
| 1449 | |
| 1450 | protected: |
| 1451 | // Note that we've added another relative reloc. |
| 1452 | void |
| 1453 | bump_relative_reloc_count() |
| 1454 | { ++this->relative_reloc_count_; } |
| 1455 | |
| 1456 | private: |
| 1457 | // The number of relative relocs added to this section. This is to |
| 1458 | // support DT_RELCOUNT. |
| 1459 | size_t relative_reloc_count_; |
| 1460 | // Whether to sort the relocations when writing them out, to make |
| 1461 | // the dynamic linker more efficient. |
| 1462 | bool sort_relocs_; |
| 1463 | }; |
| 1464 | |
| 1465 | // Output_data_reloc is used to manage a section containing relocs. |
| 1466 | // SH_TYPE is either elfcpp::SHT_REL or elfcpp::SHT_RELA. DYNAMIC |
| 1467 | // indicates whether this is a dynamic relocation or a normal |
| 1468 | // relocation. Output_data_reloc_base is a base class. |
| 1469 | // Output_data_reloc is the real class, which we specialize based on |
| 1470 | // the reloc type. |
| 1471 | |
| 1472 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 1473 | class Output_data_reloc_base : public Output_data_reloc_generic |
| 1474 | { |
| 1475 | public: |
| 1476 | typedef Output_reloc<sh_type, dynamic, size, big_endian> Output_reloc_type; |
| 1477 | typedef typename Output_reloc_type::Address Address; |
| 1478 | static const int reloc_size = |
| 1479 | Reloc_types<sh_type, size, big_endian>::reloc_size; |
| 1480 | |
| 1481 | // Construct the section. |
| 1482 | Output_data_reloc_base(bool sort_relocs) |
| 1483 | : Output_data_reloc_generic(size, sort_relocs) |
| 1484 | { } |
| 1485 | |
| 1486 | protected: |
| 1487 | // Write out the data. |
| 1488 | void |
| 1489 | do_write(Output_file*); |
| 1490 | |
| 1491 | // Set the entry size and the link. |
| 1492 | void |
| 1493 | do_adjust_output_section(Output_section* os); |
| 1494 | |
| 1495 | // Write to a map file. |
| 1496 | void |
| 1497 | do_print_to_mapfile(Mapfile* mapfile) const |
| 1498 | { |
| 1499 | mapfile->print_output_data(this, |
| 1500 | (dynamic |
| 1501 | ? _("** dynamic relocs") |
| 1502 | : _("** relocs"))); |
| 1503 | } |
| 1504 | |
| 1505 | // Add a relocation entry. |
| 1506 | void |
| 1507 | add(Output_data* od, const Output_reloc_type& reloc) |
| 1508 | { |
| 1509 | this->relocs_.push_back(reloc); |
| 1510 | this->set_current_data_size(this->relocs_.size() * reloc_size); |
| 1511 | if (dynamic) |
| 1512 | od->add_dynamic_reloc(); |
| 1513 | if (reloc.is_relative()) |
| 1514 | this->bump_relative_reloc_count(); |
| 1515 | Sized_relobj<size, big_endian>* relobj = reloc.get_relobj(); |
| 1516 | if (relobj != NULL) |
| 1517 | relobj->add_dyn_reloc(this->relocs_.size() - 1); |
| 1518 | } |
| 1519 | |
| 1520 | private: |
| 1521 | typedef std::vector<Output_reloc_type> Relocs; |
| 1522 | |
| 1523 | // The class used to sort the relocations. |
| 1524 | struct Sort_relocs_comparison |
| 1525 | { |
| 1526 | bool |
| 1527 | operator()(const Output_reloc_type& r1, const Output_reloc_type& r2) const |
| 1528 | { return r1.sort_before(r2); } |
| 1529 | }; |
| 1530 | |
| 1531 | // The relocations in this section. |
| 1532 | Relocs relocs_; |
| 1533 | }; |
| 1534 | |
| 1535 | // The class which callers actually create. |
| 1536 | |
| 1537 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 1538 | class Output_data_reloc; |
| 1539 | |
| 1540 | // The SHT_REL version of Output_data_reloc. |
| 1541 | |
| 1542 | template<bool dynamic, int size, bool big_endian> |
| 1543 | class Output_data_reloc<elfcpp::SHT_REL, dynamic, size, big_endian> |
| 1544 | : public Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian> |
| 1545 | { |
| 1546 | private: |
| 1547 | typedef Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, |
| 1548 | big_endian> Base; |
| 1549 | |
| 1550 | public: |
| 1551 | typedef typename Base::Output_reloc_type Output_reloc_type; |
| 1552 | typedef typename Output_reloc_type::Address Address; |
| 1553 | |
| 1554 | Output_data_reloc(bool sr) |
| 1555 | : Output_data_reloc_base<elfcpp::SHT_REL, dynamic, size, big_endian>(sr) |
| 1556 | { } |
| 1557 | |
| 1558 | // Add a reloc against a global symbol. |
| 1559 | |
| 1560 | void |
| 1561 | add_global(Symbol* gsym, unsigned int type, Output_data* od, Address address) |
| 1562 | { this->add(od, Output_reloc_type(gsym, type, od, address, false, false, false)); } |
| 1563 | |
| 1564 | void |
| 1565 | add_global(Symbol* gsym, unsigned int type, Output_data* od, |
| 1566 | Sized_relobj<size, big_endian>* relobj, |
| 1567 | unsigned int shndx, Address address) |
| 1568 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1569 | false, false, false)); } |
| 1570 | |
| 1571 | void |
| 1572 | add_global_generic(Symbol* gsym, unsigned int type, Output_data* od, |
| 1573 | uint64_t address, uint64_t addend) |
| 1574 | { |
| 1575 | gold_assert(addend == 0); |
| 1576 | this->add(od, Output_reloc_type(gsym, type, od, |
| 1577 | convert_types<Address, uint64_t>(address), |
| 1578 | false, false, false)); |
| 1579 | } |
| 1580 | |
| 1581 | void |
| 1582 | add_global_generic(Symbol* gsym, unsigned int type, Output_data* od, |
| 1583 | Relobj* relobj, unsigned int shndx, uint64_t address, |
| 1584 | uint64_t addend) |
| 1585 | { |
| 1586 | gold_assert(addend == 0); |
| 1587 | Sized_relobj<size, big_endian>* sized_relobj = |
| 1588 | static_cast<Sized_relobj<size, big_endian>*>(relobj); |
| 1589 | this->add(od, Output_reloc_type(gsym, type, sized_relobj, shndx, |
| 1590 | convert_types<Address, uint64_t>(address), |
| 1591 | false, false, false)); |
| 1592 | } |
| 1593 | |
| 1594 | // Add a RELATIVE reloc against a global symbol. The final relocation |
| 1595 | // will not reference the symbol. |
| 1596 | |
| 1597 | void |
| 1598 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 1599 | Address address) |
| 1600 | { this->add(od, Output_reloc_type(gsym, type, od, address, true, true, |
| 1601 | false)); } |
| 1602 | |
| 1603 | void |
| 1604 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 1605 | Sized_relobj<size, big_endian>* relobj, |
| 1606 | unsigned int shndx, Address address) |
| 1607 | { |
| 1608 | this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1609 | true, true, false)); |
| 1610 | } |
| 1611 | |
| 1612 | // Add a global relocation which does not use a symbol for the relocation, |
| 1613 | // but which gets its addend from a symbol. |
| 1614 | |
| 1615 | void |
| 1616 | add_symbolless_global_addend(Symbol* gsym, unsigned int type, |
| 1617 | Output_data* od, Address address) |
| 1618 | { this->add(od, Output_reloc_type(gsym, type, od, address, false, true, |
| 1619 | false)); } |
| 1620 | |
| 1621 | void |
| 1622 | add_symbolless_global_addend(Symbol* gsym, unsigned int type, |
| 1623 | Output_data* od, |
| 1624 | Sized_relobj<size, big_endian>* relobj, |
| 1625 | unsigned int shndx, Address address) |
| 1626 | { |
| 1627 | this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1628 | false, true, false)); |
| 1629 | } |
| 1630 | |
| 1631 | // Add a reloc against a local symbol. |
| 1632 | |
| 1633 | void |
| 1634 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 1635 | unsigned int local_sym_index, unsigned int type, |
| 1636 | Output_data* od, Address address) |
| 1637 | { |
| 1638 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, |
| 1639 | address, false, false, false, false)); |
| 1640 | } |
| 1641 | |
| 1642 | void |
| 1643 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 1644 | unsigned int local_sym_index, unsigned int type, |
| 1645 | Output_data* od, unsigned int shndx, Address address) |
| 1646 | { |
| 1647 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1648 | address, false, false, false, false)); |
| 1649 | } |
| 1650 | |
| 1651 | void |
| 1652 | add_local_generic(Relobj* relobj, unsigned int local_sym_index, |
| 1653 | unsigned int type, Output_data* od, uint64_t address, |
| 1654 | uint64_t addend) |
| 1655 | { |
| 1656 | gold_assert(addend == 0); |
| 1657 | Sized_relobj<size, big_endian>* sized_relobj = |
| 1658 | static_cast<Sized_relobj<size, big_endian> *>(relobj); |
| 1659 | this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, od, |
| 1660 | convert_types<Address, uint64_t>(address), |
| 1661 | false, false, false, false)); |
| 1662 | } |
| 1663 | |
| 1664 | void |
| 1665 | add_local_generic(Relobj* relobj, unsigned int local_sym_index, |
| 1666 | unsigned int type, Output_data* od, unsigned int shndx, |
| 1667 | uint64_t address, uint64_t addend) |
| 1668 | { |
| 1669 | gold_assert(addend == 0); |
| 1670 | Sized_relobj<size, big_endian>* sized_relobj = |
| 1671 | static_cast<Sized_relobj<size, big_endian>*>(relobj); |
| 1672 | this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, shndx, |
| 1673 | convert_types<Address, uint64_t>(address), |
| 1674 | false, false, false, false)); |
| 1675 | } |
| 1676 | |
| 1677 | // Add a RELATIVE reloc against a local symbol. |
| 1678 | |
| 1679 | void |
| 1680 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 1681 | unsigned int local_sym_index, unsigned int type, |
| 1682 | Output_data* od, Address address) |
| 1683 | { |
| 1684 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, |
| 1685 | address, true, true, false, false)); |
| 1686 | } |
| 1687 | |
| 1688 | void |
| 1689 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 1690 | unsigned int local_sym_index, unsigned int type, |
| 1691 | Output_data* od, unsigned int shndx, Address address) |
| 1692 | { |
| 1693 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1694 | address, true, true, false, false)); |
| 1695 | } |
| 1696 | |
| 1697 | // Add a local relocation which does not use a symbol for the relocation, |
| 1698 | // but which gets its addend from a symbol. |
| 1699 | |
| 1700 | void |
| 1701 | add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj, |
| 1702 | unsigned int local_sym_index, unsigned int type, |
| 1703 | Output_data* od, Address address) |
| 1704 | { |
| 1705 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, |
| 1706 | address, false, true, false, false)); |
| 1707 | } |
| 1708 | |
| 1709 | void |
| 1710 | add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj, |
| 1711 | unsigned int local_sym_index, unsigned int type, |
| 1712 | Output_data* od, unsigned int shndx, |
| 1713 | Address address) |
| 1714 | { |
| 1715 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1716 | address, false, true, false, false)); |
| 1717 | } |
| 1718 | |
| 1719 | // Add a reloc against a local section symbol. This will be |
| 1720 | // converted into a reloc against the STT_SECTION symbol of the |
| 1721 | // output section. |
| 1722 | |
| 1723 | void |
| 1724 | add_local_section(Sized_relobj<size, big_endian>* relobj, |
| 1725 | unsigned int input_shndx, unsigned int type, |
| 1726 | Output_data* od, Address address) |
| 1727 | { |
| 1728 | this->add(od, Output_reloc_type(relobj, input_shndx, type, od, |
| 1729 | address, false, false, true, false)); |
| 1730 | } |
| 1731 | |
| 1732 | void |
| 1733 | add_local_section(Sized_relobj<size, big_endian>* relobj, |
| 1734 | unsigned int input_shndx, unsigned int type, |
| 1735 | Output_data* od, unsigned int shndx, Address address) |
| 1736 | { |
| 1737 | this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx, |
| 1738 | address, false, false, true, false)); |
| 1739 | } |
| 1740 | |
| 1741 | // A reloc against the STT_SECTION symbol of an output section. |
| 1742 | // OS is the Output_section that the relocation refers to; OD is |
| 1743 | // the Output_data object being relocated. |
| 1744 | |
| 1745 | void |
| 1746 | add_output_section(Output_section* os, unsigned int type, |
| 1747 | Output_data* od, Address address) |
| 1748 | { this->add(od, Output_reloc_type(os, type, od, address)); } |
| 1749 | |
| 1750 | void |
| 1751 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
| 1752 | Sized_relobj<size, big_endian>* relobj, |
| 1753 | unsigned int shndx, Address address) |
| 1754 | { this->add(od, Output_reloc_type(os, type, relobj, shndx, address)); } |
| 1755 | |
| 1756 | void |
| 1757 | add_output_section_generic(Output_section* os, unsigned int type, |
| 1758 | Output_data* od, uint64_t address, |
| 1759 | uint64_t addend) |
| 1760 | { |
| 1761 | gold_assert(addend == 0); |
| 1762 | this->add(od, Output_reloc_type(os, type, od, |
| 1763 | convert_types<Address, uint64_t>(address))); |
| 1764 | } |
| 1765 | |
| 1766 | void |
| 1767 | add_output_section_generic(Output_section* os, unsigned int type, |
| 1768 | Output_data* od, Relobj* relobj, |
| 1769 | unsigned int shndx, uint64_t address, |
| 1770 | uint64_t addend) |
| 1771 | { |
| 1772 | gold_assert(addend == 0); |
| 1773 | Sized_relobj<size, big_endian>* sized_relobj = |
| 1774 | static_cast<Sized_relobj<size, big_endian>*>(relobj); |
| 1775 | this->add(od, Output_reloc_type(os, type, sized_relobj, shndx, |
| 1776 | convert_types<Address, uint64_t>(address))); |
| 1777 | } |
| 1778 | |
| 1779 | // Add an absolute relocation. |
| 1780 | |
| 1781 | void |
| 1782 | add_absolute(unsigned int type, Output_data* od, Address address) |
| 1783 | { this->add(od, Output_reloc_type(type, od, address)); } |
| 1784 | |
| 1785 | void |
| 1786 | add_absolute(unsigned int type, Output_data* od, |
| 1787 | Sized_relobj<size, big_endian>* relobj, |
| 1788 | unsigned int shndx, Address address) |
| 1789 | { this->add(od, Output_reloc_type(type, relobj, shndx, address)); } |
| 1790 | |
| 1791 | // Add a target specific relocation. A target which calls this must |
| 1792 | // define the reloc_symbol_index and reloc_addend virtual functions. |
| 1793 | |
| 1794 | void |
| 1795 | add_target_specific(unsigned int type, void* arg, Output_data* od, |
| 1796 | Address address) |
| 1797 | { this->add(od, Output_reloc_type(type, arg, od, address)); } |
| 1798 | |
| 1799 | void |
| 1800 | add_target_specific(unsigned int type, void* arg, Output_data* od, |
| 1801 | Sized_relobj<size, big_endian>* relobj, |
| 1802 | unsigned int shndx, Address address) |
| 1803 | { this->add(od, Output_reloc_type(type, arg, relobj, shndx, address)); } |
| 1804 | }; |
| 1805 | |
| 1806 | // The SHT_RELA version of Output_data_reloc. |
| 1807 | |
| 1808 | template<bool dynamic, int size, bool big_endian> |
| 1809 | class Output_data_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian> |
| 1810 | : public Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian> |
| 1811 | { |
| 1812 | private: |
| 1813 | typedef Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, |
| 1814 | big_endian> Base; |
| 1815 | |
| 1816 | public: |
| 1817 | typedef typename Base::Output_reloc_type Output_reloc_type; |
| 1818 | typedef typename Output_reloc_type::Address Address; |
| 1819 | typedef typename Output_reloc_type::Addend Addend; |
| 1820 | |
| 1821 | Output_data_reloc(bool sr) |
| 1822 | : Output_data_reloc_base<elfcpp::SHT_RELA, dynamic, size, big_endian>(sr) |
| 1823 | { } |
| 1824 | |
| 1825 | // Add a reloc against a global symbol. |
| 1826 | |
| 1827 | void |
| 1828 | add_global(Symbol* gsym, unsigned int type, Output_data* od, |
| 1829 | Address address, Addend addend) |
| 1830 | { this->add(od, Output_reloc_type(gsym, type, od, address, addend, |
| 1831 | false, false, false)); } |
| 1832 | |
| 1833 | void |
| 1834 | add_global(Symbol* gsym, unsigned int type, Output_data* od, |
| 1835 | Sized_relobj<size, big_endian>* relobj, |
| 1836 | unsigned int shndx, Address address, |
| 1837 | Addend addend) |
| 1838 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1839 | addend, false, false, false)); } |
| 1840 | |
| 1841 | void |
| 1842 | add_global_generic(Symbol* gsym, unsigned int type, Output_data* od, |
| 1843 | uint64_t address, uint64_t addend) |
| 1844 | { |
| 1845 | this->add(od, Output_reloc_type(gsym, type, od, |
| 1846 | convert_types<Address, uint64_t>(address), |
| 1847 | convert_types<Addend, uint64_t>(addend), |
| 1848 | false, false, false)); |
| 1849 | } |
| 1850 | |
| 1851 | void |
| 1852 | add_global_generic(Symbol* gsym, unsigned int type, Output_data* od, |
| 1853 | Relobj* relobj, unsigned int shndx, uint64_t address, |
| 1854 | uint64_t addend) |
| 1855 | { |
| 1856 | Sized_relobj<size, big_endian>* sized_relobj = |
| 1857 | static_cast<Sized_relobj<size, big_endian>*>(relobj); |
| 1858 | this->add(od, Output_reloc_type(gsym, type, sized_relobj, shndx, |
| 1859 | convert_types<Address, uint64_t>(address), |
| 1860 | convert_types<Addend, uint64_t>(addend), |
| 1861 | false, false, false)); |
| 1862 | } |
| 1863 | |
| 1864 | // Add a RELATIVE reloc against a global symbol. The final output |
| 1865 | // relocation will not reference the symbol, but we must keep the symbol |
| 1866 | // information long enough to set the addend of the relocation correctly |
| 1867 | // when it is written. |
| 1868 | |
| 1869 | void |
| 1870 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 1871 | Address address, Addend addend, bool use_plt_offset) |
| 1872 | { this->add(od, Output_reloc_type(gsym, type, od, address, addend, true, |
| 1873 | true, use_plt_offset)); } |
| 1874 | |
| 1875 | void |
| 1876 | add_global_relative(Symbol* gsym, unsigned int type, Output_data* od, |
| 1877 | Sized_relobj<size, big_endian>* relobj, |
| 1878 | unsigned int shndx, Address address, Addend addend, |
| 1879 | bool use_plt_offset) |
| 1880 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1881 | addend, true, true, use_plt_offset)); } |
| 1882 | |
| 1883 | // Add a global relocation which does not use a symbol for the relocation, |
| 1884 | // but which gets its addend from a symbol. |
| 1885 | |
| 1886 | void |
| 1887 | add_symbolless_global_addend(Symbol* gsym, unsigned int type, Output_data* od, |
| 1888 | Address address, Addend addend) |
| 1889 | { this->add(od, Output_reloc_type(gsym, type, od, address, addend, |
| 1890 | false, true, false)); } |
| 1891 | |
| 1892 | void |
| 1893 | add_symbolless_global_addend(Symbol* gsym, unsigned int type, |
| 1894 | Output_data* od, |
| 1895 | Sized_relobj<size, big_endian>* relobj, |
| 1896 | unsigned int shndx, Address address, Addend addend) |
| 1897 | { this->add(od, Output_reloc_type(gsym, type, relobj, shndx, address, |
| 1898 | addend, false, true, false)); } |
| 1899 | |
| 1900 | // Add a reloc against a local symbol. |
| 1901 | |
| 1902 | void |
| 1903 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 1904 | unsigned int local_sym_index, unsigned int type, |
| 1905 | Output_data* od, Address address, Addend addend) |
| 1906 | { |
| 1907 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address, |
| 1908 | addend, false, false, false, false)); |
| 1909 | } |
| 1910 | |
| 1911 | void |
| 1912 | add_local(Sized_relobj<size, big_endian>* relobj, |
| 1913 | unsigned int local_sym_index, unsigned int type, |
| 1914 | Output_data* od, unsigned int shndx, Address address, |
| 1915 | Addend addend) |
| 1916 | { |
| 1917 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1918 | address, addend, false, false, false, |
| 1919 | false)); |
| 1920 | } |
| 1921 | |
| 1922 | void |
| 1923 | add_local_generic(Relobj* relobj, unsigned int local_sym_index, |
| 1924 | unsigned int type, Output_data* od, uint64_t address, |
| 1925 | uint64_t addend) |
| 1926 | { |
| 1927 | Sized_relobj<size, big_endian>* sized_relobj = |
| 1928 | static_cast<Sized_relobj<size, big_endian> *>(relobj); |
| 1929 | this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, od, |
| 1930 | convert_types<Address, uint64_t>(address), |
| 1931 | convert_types<Addend, uint64_t>(addend), |
| 1932 | false, false, false, false)); |
| 1933 | } |
| 1934 | |
| 1935 | void |
| 1936 | add_local_generic(Relobj* relobj, unsigned int local_sym_index, |
| 1937 | unsigned int type, Output_data* od, unsigned int shndx, |
| 1938 | uint64_t address, uint64_t addend) |
| 1939 | { |
| 1940 | Sized_relobj<size, big_endian>* sized_relobj = |
| 1941 | static_cast<Sized_relobj<size, big_endian>*>(relobj); |
| 1942 | this->add(od, Output_reloc_type(sized_relobj, local_sym_index, type, shndx, |
| 1943 | convert_types<Address, uint64_t>(address), |
| 1944 | convert_types<Addend, uint64_t>(addend), |
| 1945 | false, false, false, false)); |
| 1946 | } |
| 1947 | |
| 1948 | // Add a RELATIVE reloc against a local symbol. |
| 1949 | |
| 1950 | void |
| 1951 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 1952 | unsigned int local_sym_index, unsigned int type, |
| 1953 | Output_data* od, Address address, Addend addend, |
| 1954 | bool use_plt_offset) |
| 1955 | { |
| 1956 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address, |
| 1957 | addend, true, true, false, |
| 1958 | use_plt_offset)); |
| 1959 | } |
| 1960 | |
| 1961 | void |
| 1962 | add_local_relative(Sized_relobj<size, big_endian>* relobj, |
| 1963 | unsigned int local_sym_index, unsigned int type, |
| 1964 | Output_data* od, unsigned int shndx, Address address, |
| 1965 | Addend addend, bool use_plt_offset) |
| 1966 | { |
| 1967 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1968 | address, addend, true, true, false, |
| 1969 | use_plt_offset)); |
| 1970 | } |
| 1971 | |
| 1972 | // Add a local relocation which does not use a symbol for the relocation, |
| 1973 | // but which gets it's addend from a symbol. |
| 1974 | |
| 1975 | void |
| 1976 | add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj, |
| 1977 | unsigned int local_sym_index, unsigned int type, |
| 1978 | Output_data* od, Address address, Addend addend) |
| 1979 | { |
| 1980 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, od, address, |
| 1981 | addend, false, true, false, false)); |
| 1982 | } |
| 1983 | |
| 1984 | void |
| 1985 | add_symbolless_local_addend(Sized_relobj<size, big_endian>* relobj, |
| 1986 | unsigned int local_sym_index, unsigned int type, |
| 1987 | Output_data* od, unsigned int shndx, |
| 1988 | Address address, Addend addend) |
| 1989 | { |
| 1990 | this->add(od, Output_reloc_type(relobj, local_sym_index, type, shndx, |
| 1991 | address, addend, false, true, false, |
| 1992 | false)); |
| 1993 | } |
| 1994 | |
| 1995 | // Add a reloc against a local section symbol. This will be |
| 1996 | // converted into a reloc against the STT_SECTION symbol of the |
| 1997 | // output section. |
| 1998 | |
| 1999 | void |
| 2000 | add_local_section(Sized_relobj<size, big_endian>* relobj, |
| 2001 | unsigned int input_shndx, unsigned int type, |
| 2002 | Output_data* od, Address address, Addend addend) |
| 2003 | { |
| 2004 | this->add(od, Output_reloc_type(relobj, input_shndx, type, od, address, |
| 2005 | addend, false, false, true, false)); |
| 2006 | } |
| 2007 | |
| 2008 | void |
| 2009 | add_local_section(Sized_relobj<size, big_endian>* relobj, |
| 2010 | unsigned int input_shndx, unsigned int type, |
| 2011 | Output_data* od, unsigned int shndx, Address address, |
| 2012 | Addend addend) |
| 2013 | { |
| 2014 | this->add(od, Output_reloc_type(relobj, input_shndx, type, shndx, |
| 2015 | address, addend, false, false, true, |
| 2016 | false)); |
| 2017 | } |
| 2018 | |
| 2019 | // A reloc against the STT_SECTION symbol of an output section. |
| 2020 | |
| 2021 | void |
| 2022 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
| 2023 | Address address, Addend addend) |
| 2024 | { this->add(od, Output_reloc_type(os, type, od, address, addend)); } |
| 2025 | |
| 2026 | void |
| 2027 | add_output_section(Output_section* os, unsigned int type, Output_data* od, |
| 2028 | Sized_relobj<size, big_endian>* relobj, |
| 2029 | unsigned int shndx, Address address, Addend addend) |
| 2030 | { this->add(od, Output_reloc_type(os, type, relobj, shndx, address, |
| 2031 | addend)); } |
| 2032 | |
| 2033 | void |
| 2034 | add_output_section_generic(Output_section* os, unsigned int type, |
| 2035 | Output_data* od, uint64_t address, |
| 2036 | uint64_t addend) |
| 2037 | { |
| 2038 | this->add(od, Output_reloc_type(os, type, od, |
| 2039 | convert_types<Address, uint64_t>(address), |
| 2040 | convert_types<Addend, uint64_t>(addend))); |
| 2041 | } |
| 2042 | |
| 2043 | void |
| 2044 | add_output_section_generic(Output_section* os, unsigned int type, |
| 2045 | Output_data* od, Relobj* relobj, |
| 2046 | unsigned int shndx, uint64_t address, |
| 2047 | uint64_t addend) |
| 2048 | { |
| 2049 | Sized_relobj<size, big_endian>* sized_relobj = |
| 2050 | static_cast<Sized_relobj<size, big_endian>*>(relobj); |
| 2051 | this->add(od, Output_reloc_type(os, type, sized_relobj, shndx, |
| 2052 | convert_types<Address, uint64_t>(address), |
| 2053 | convert_types<Addend, uint64_t>(addend))); |
| 2054 | } |
| 2055 | |
| 2056 | // Add an absolute relocation. |
| 2057 | |
| 2058 | void |
| 2059 | add_absolute(unsigned int type, Output_data* od, Address address, |
| 2060 | Addend addend) |
| 2061 | { this->add(od, Output_reloc_type(type, od, address, addend)); } |
| 2062 | |
| 2063 | void |
| 2064 | add_absolute(unsigned int type, Output_data* od, |
| 2065 | Sized_relobj<size, big_endian>* relobj, |
| 2066 | unsigned int shndx, Address address, Addend addend) |
| 2067 | { this->add(od, Output_reloc_type(type, relobj, shndx, address, addend)); } |
| 2068 | |
| 2069 | // Add a target specific relocation. A target which calls this must |
| 2070 | // define the reloc_symbol_index and reloc_addend virtual functions. |
| 2071 | |
| 2072 | void |
| 2073 | add_target_specific(unsigned int type, void* arg, Output_data* od, |
| 2074 | Address address, Addend addend) |
| 2075 | { this->add(od, Output_reloc_type(type, arg, od, address, addend)); } |
| 2076 | |
| 2077 | void |
| 2078 | add_target_specific(unsigned int type, void* arg, Output_data* od, |
| 2079 | Sized_relobj<size, big_endian>* relobj, |
| 2080 | unsigned int shndx, Address address, Addend addend) |
| 2081 | { |
| 2082 | this->add(od, Output_reloc_type(type, arg, relobj, shndx, address, |
| 2083 | addend)); |
| 2084 | } |
| 2085 | }; |
| 2086 | |
| 2087 | // Output_relocatable_relocs represents a relocation section in a |
| 2088 | // relocatable link. The actual data is written out in the target |
| 2089 | // hook relocate_for_relocatable. This just saves space for it. |
| 2090 | |
| 2091 | template<int sh_type, int size, bool big_endian> |
| 2092 | class Output_relocatable_relocs : public Output_section_data |
| 2093 | { |
| 2094 | public: |
| 2095 | Output_relocatable_relocs(Relocatable_relocs* rr) |
| 2096 | : Output_section_data(Output_data::default_alignment_for_size(size)), |
| 2097 | rr_(rr) |
| 2098 | { } |
| 2099 | |
| 2100 | void |
| 2101 | set_final_data_size(); |
| 2102 | |
| 2103 | // Write out the data. There is nothing to do here. |
| 2104 | void |
| 2105 | do_write(Output_file*) |
| 2106 | { } |
| 2107 | |
| 2108 | // Write to a map file. |
| 2109 | void |
| 2110 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2111 | { mapfile->print_output_data(this, _("** relocs")); } |
| 2112 | |
| 2113 | private: |
| 2114 | // The relocs associated with this input section. |
| 2115 | Relocatable_relocs* rr_; |
| 2116 | }; |
| 2117 | |
| 2118 | // Handle a GROUP section. |
| 2119 | |
| 2120 | template<int size, bool big_endian> |
| 2121 | class Output_data_group : public Output_section_data |
| 2122 | { |
| 2123 | public: |
| 2124 | // The constructor clears *INPUT_SHNDXES. |
| 2125 | Output_data_group(Sized_relobj_file<size, big_endian>* relobj, |
| 2126 | section_size_type entry_count, |
| 2127 | elfcpp::Elf_Word flags, |
| 2128 | std::vector<unsigned int>* input_shndxes); |
| 2129 | |
| 2130 | void |
| 2131 | do_write(Output_file*); |
| 2132 | |
| 2133 | // Write to a map file. |
| 2134 | void |
| 2135 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2136 | { mapfile->print_output_data(this, _("** group")); } |
| 2137 | |
| 2138 | // Set final data size. |
| 2139 | void |
| 2140 | set_final_data_size() |
| 2141 | { this->set_data_size((this->input_shndxes_.size() + 1) * 4); } |
| 2142 | |
| 2143 | private: |
| 2144 | // The input object. |
| 2145 | Sized_relobj_file<size, big_endian>* relobj_; |
| 2146 | // The group flag word. |
| 2147 | elfcpp::Elf_Word flags_; |
| 2148 | // The section indexes of the input sections in this group. |
| 2149 | std::vector<unsigned int> input_shndxes_; |
| 2150 | }; |
| 2151 | |
| 2152 | // Output_data_got is used to manage a GOT. Each entry in the GOT is |
| 2153 | // for one symbol--either a global symbol or a local symbol in an |
| 2154 | // object. The target specific code adds entries to the GOT as |
| 2155 | // needed. The GOT_SIZE template parameter is the size in bits of a |
| 2156 | // GOT entry, typically 32 or 64. |
| 2157 | |
| 2158 | class Output_data_got_base : public Output_section_data_build |
| 2159 | { |
| 2160 | public: |
| 2161 | Output_data_got_base(uint64_t align) |
| 2162 | : Output_section_data_build(align) |
| 2163 | { } |
| 2164 | |
| 2165 | Output_data_got_base(off_t data_size, uint64_t align) |
| 2166 | : Output_section_data_build(data_size, align) |
| 2167 | { } |
| 2168 | |
| 2169 | // Reserve the slot at index I in the GOT. |
| 2170 | void |
| 2171 | reserve_slot(unsigned int i) |
| 2172 | { this->do_reserve_slot(i); } |
| 2173 | |
| 2174 | protected: |
| 2175 | // Reserve the slot at index I in the GOT. |
| 2176 | virtual void |
| 2177 | do_reserve_slot(unsigned int i) = 0; |
| 2178 | }; |
| 2179 | |
| 2180 | template<int got_size, bool big_endian> |
| 2181 | class Output_data_got : public Output_data_got_base |
| 2182 | { |
| 2183 | public: |
| 2184 | typedef typename elfcpp::Elf_types<got_size>::Elf_Addr Valtype; |
| 2185 | |
| 2186 | Output_data_got() |
| 2187 | : Output_data_got_base(Output_data::default_alignment_for_size(got_size)), |
| 2188 | entries_(), free_list_() |
| 2189 | { } |
| 2190 | |
| 2191 | Output_data_got(off_t data_size) |
| 2192 | : Output_data_got_base(data_size, |
| 2193 | Output_data::default_alignment_for_size(got_size)), |
| 2194 | entries_(), free_list_() |
| 2195 | { |
| 2196 | // For an incremental update, we have an existing GOT section. |
| 2197 | // Initialize the list of entries and the free list. |
| 2198 | this->entries_.resize(data_size / (got_size / 8)); |
| 2199 | this->free_list_.init(data_size, false); |
| 2200 | } |
| 2201 | |
| 2202 | // Add an entry for a global symbol to the GOT. Return true if this |
| 2203 | // is a new GOT entry, false if the symbol was already in the GOT. |
| 2204 | bool |
| 2205 | add_global(Symbol* gsym, unsigned int got_type); |
| 2206 | |
| 2207 | // Like add_global, but use the PLT offset of the global symbol if |
| 2208 | // it has one. |
| 2209 | bool |
| 2210 | add_global_plt(Symbol* gsym, unsigned int got_type); |
| 2211 | |
| 2212 | // Add an entry for a global symbol to the GOT, and add a dynamic |
| 2213 | // relocation of type R_TYPE for the GOT entry. |
| 2214 | void |
| 2215 | add_global_with_rel(Symbol* gsym, unsigned int got_type, |
| 2216 | Output_data_reloc_generic* rel_dyn, unsigned int r_type); |
| 2217 | |
| 2218 | // Add a pair of entries for a global symbol to the GOT, and add |
| 2219 | // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively. |
| 2220 | void |
| 2221 | add_global_pair_with_rel(Symbol* gsym, unsigned int got_type, |
| 2222 | Output_data_reloc_generic* rel_dyn, |
| 2223 | unsigned int r_type_1, unsigned int r_type_2); |
| 2224 | |
| 2225 | // Add an entry for a local symbol to the GOT. This returns true if |
| 2226 | // this is a new GOT entry, false if the symbol already has a GOT |
| 2227 | // entry. |
| 2228 | bool |
| 2229 | add_local(Relobj* object, unsigned int sym_index, unsigned int got_type); |
| 2230 | |
| 2231 | // Like add_local, but use the PLT offset of the local symbol if it |
| 2232 | // has one. |
| 2233 | bool |
| 2234 | add_local_plt(Relobj* object, unsigned int sym_index, unsigned int got_type); |
| 2235 | |
| 2236 | // Add an entry for a local symbol to the GOT, and add a dynamic |
| 2237 | // relocation of type R_TYPE for the GOT entry. |
| 2238 | void |
| 2239 | add_local_with_rel(Relobj* object, unsigned int sym_index, |
| 2240 | unsigned int got_type, Output_data_reloc_generic* rel_dyn, |
| 2241 | unsigned int r_type); |
| 2242 | |
| 2243 | // Add a pair of entries for a local symbol to the GOT, and add |
| 2244 | // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively. |
| 2245 | void |
| 2246 | add_local_pair_with_rel(Relobj* object, unsigned int sym_index, |
| 2247 | unsigned int shndx, unsigned int got_type, |
| 2248 | Output_data_reloc_generic* rel_dyn, |
| 2249 | unsigned int r_type_1, unsigned int r_type_2); |
| 2250 | |
| 2251 | // Add a constant to the GOT. This returns the offset of the new |
| 2252 | // entry from the start of the GOT. |
| 2253 | unsigned int |
| 2254 | add_constant(Valtype constant) |
| 2255 | { |
| 2256 | unsigned int got_offset = this->add_got_entry(Got_entry(constant)); |
| 2257 | return got_offset; |
| 2258 | } |
| 2259 | |
| 2260 | // Reserve a slot in the GOT for a local symbol. |
| 2261 | void |
| 2262 | reserve_local(unsigned int i, Relobj* object, unsigned int sym_index, |
| 2263 | unsigned int got_type); |
| 2264 | |
| 2265 | // Reserve a slot in the GOT for a global symbol. |
| 2266 | void |
| 2267 | reserve_global(unsigned int i, Symbol* gsym, unsigned int got_type); |
| 2268 | |
| 2269 | protected: |
| 2270 | // Write out the GOT table. |
| 2271 | void |
| 2272 | do_write(Output_file*); |
| 2273 | |
| 2274 | // Write to a map file. |
| 2275 | void |
| 2276 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2277 | { mapfile->print_output_data(this, _("** GOT")); } |
| 2278 | |
| 2279 | // Reserve the slot at index I in the GOT. |
| 2280 | virtual void |
| 2281 | do_reserve_slot(unsigned int i) |
| 2282 | { this->free_list_.remove(i * got_size / 8, (i + 1) * got_size / 8); } |
| 2283 | |
| 2284 | private: |
| 2285 | // This POD class holds a single GOT entry. |
| 2286 | class Got_entry |
| 2287 | { |
| 2288 | public: |
| 2289 | // Create a zero entry. |
| 2290 | Got_entry() |
| 2291 | : local_sym_index_(RESERVED_CODE), use_plt_offset_(false) |
| 2292 | { this->u_.constant = 0; } |
| 2293 | |
| 2294 | // Create a global symbol entry. |
| 2295 | Got_entry(Symbol* gsym, bool use_plt_offset) |
| 2296 | : local_sym_index_(GSYM_CODE), use_plt_offset_(use_plt_offset) |
| 2297 | { this->u_.gsym = gsym; } |
| 2298 | |
| 2299 | // Create a local symbol entry. |
| 2300 | Got_entry(Relobj* object, unsigned int local_sym_index, |
| 2301 | bool use_plt_offset) |
| 2302 | : local_sym_index_(local_sym_index), use_plt_offset_(use_plt_offset) |
| 2303 | { |
| 2304 | gold_assert(local_sym_index != GSYM_CODE |
| 2305 | && local_sym_index != CONSTANT_CODE |
| 2306 | && local_sym_index != RESERVED_CODE |
| 2307 | && local_sym_index == this->local_sym_index_); |
| 2308 | this->u_.object = object; |
| 2309 | } |
| 2310 | |
| 2311 | // Create a constant entry. The constant is a host value--it will |
| 2312 | // be swapped, if necessary, when it is written out. |
| 2313 | explicit Got_entry(Valtype constant) |
| 2314 | : local_sym_index_(CONSTANT_CODE), use_plt_offset_(false) |
| 2315 | { this->u_.constant = constant; } |
| 2316 | |
| 2317 | // Write the GOT entry to an output view. |
| 2318 | void |
| 2319 | write(unsigned char* pov) const; |
| 2320 | |
| 2321 | private: |
| 2322 | enum |
| 2323 | { |
| 2324 | GSYM_CODE = 0x7fffffff, |
| 2325 | CONSTANT_CODE = 0x7ffffffe, |
| 2326 | RESERVED_CODE = 0x7ffffffd |
| 2327 | }; |
| 2328 | |
| 2329 | union |
| 2330 | { |
| 2331 | // For a local symbol, the object. |
| 2332 | Relobj* object; |
| 2333 | // For a global symbol, the symbol. |
| 2334 | Symbol* gsym; |
| 2335 | // For a constant, the constant. |
| 2336 | Valtype constant; |
| 2337 | } u_; |
| 2338 | // For a local symbol, the local symbol index. This is GSYM_CODE |
| 2339 | // for a global symbol, or CONSTANT_CODE for a constant. |
| 2340 | unsigned int local_sym_index_ : 31; |
| 2341 | // Whether to use the PLT offset of the symbol if it has one. |
| 2342 | bool use_plt_offset_ : 1; |
| 2343 | }; |
| 2344 | |
| 2345 | typedef std::vector<Got_entry> Got_entries; |
| 2346 | |
| 2347 | // Create a new GOT entry and return its offset. |
| 2348 | unsigned int |
| 2349 | add_got_entry(Got_entry got_entry); |
| 2350 | |
| 2351 | // Create a pair of new GOT entries and return the offset of the first. |
| 2352 | unsigned int |
| 2353 | add_got_entry_pair(Got_entry got_entry_1, Got_entry got_entry_2); |
| 2354 | |
| 2355 | // Return the offset into the GOT of GOT entry I. |
| 2356 | unsigned int |
| 2357 | got_offset(unsigned int i) const |
| 2358 | { return i * (got_size / 8); } |
| 2359 | |
| 2360 | // Return the offset into the GOT of the last entry added. |
| 2361 | unsigned int |
| 2362 | last_got_offset() const |
| 2363 | { return this->got_offset(this->entries_.size() - 1); } |
| 2364 | |
| 2365 | // Set the size of the section. |
| 2366 | void |
| 2367 | set_got_size() |
| 2368 | { this->set_current_data_size(this->got_offset(this->entries_.size())); } |
| 2369 | |
| 2370 | // The list of GOT entries. |
| 2371 | Got_entries entries_; |
| 2372 | |
| 2373 | // List of available regions within the section, for incremental |
| 2374 | // update links. |
| 2375 | Free_list free_list_; |
| 2376 | }; |
| 2377 | |
| 2378 | // Output_data_dynamic is used to hold the data in SHT_DYNAMIC |
| 2379 | // section. |
| 2380 | |
| 2381 | class Output_data_dynamic : public Output_section_data |
| 2382 | { |
| 2383 | public: |
| 2384 | Output_data_dynamic(Stringpool* pool) |
| 2385 | : Output_section_data(Output_data::default_alignment()), |
| 2386 | entries_(), pool_(pool) |
| 2387 | { } |
| 2388 | |
| 2389 | // Add a new dynamic entry with a fixed numeric value. |
| 2390 | void |
| 2391 | add_constant(elfcpp::DT tag, unsigned int val) |
| 2392 | { this->add_entry(Dynamic_entry(tag, val)); } |
| 2393 | |
| 2394 | // Add a new dynamic entry with the address of output data. |
| 2395 | void |
| 2396 | add_section_address(elfcpp::DT tag, const Output_data* od) |
| 2397 | { this->add_entry(Dynamic_entry(tag, od, false)); } |
| 2398 | |
| 2399 | // Add a new dynamic entry with the address of output data |
| 2400 | // plus a constant offset. |
| 2401 | void |
| 2402 | add_section_plus_offset(elfcpp::DT tag, const Output_data* od, |
| 2403 | unsigned int offset) |
| 2404 | { this->add_entry(Dynamic_entry(tag, od, offset)); } |
| 2405 | |
| 2406 | // Add a new dynamic entry with the size of output data. |
| 2407 | void |
| 2408 | add_section_size(elfcpp::DT tag, const Output_data* od) |
| 2409 | { this->add_entry(Dynamic_entry(tag, od, true)); } |
| 2410 | |
| 2411 | // Add a new dynamic entry with the total size of two output datas. |
| 2412 | void |
| 2413 | add_section_size(elfcpp::DT tag, const Output_data* od, |
| 2414 | const Output_data* od2) |
| 2415 | { this->add_entry(Dynamic_entry(tag, od, od2)); } |
| 2416 | |
| 2417 | // Add a new dynamic entry with the address of a symbol. |
| 2418 | void |
| 2419 | add_symbol(elfcpp::DT tag, const Symbol* sym) |
| 2420 | { this->add_entry(Dynamic_entry(tag, sym)); } |
| 2421 | |
| 2422 | // Add a new dynamic entry with a string. |
| 2423 | void |
| 2424 | add_string(elfcpp::DT tag, const char* str) |
| 2425 | { this->add_entry(Dynamic_entry(tag, this->pool_->add(str, true, NULL))); } |
| 2426 | |
| 2427 | void |
| 2428 | add_string(elfcpp::DT tag, const std::string& str) |
| 2429 | { this->add_string(tag, str.c_str()); } |
| 2430 | |
| 2431 | protected: |
| 2432 | // Adjust the output section to set the entry size. |
| 2433 | void |
| 2434 | do_adjust_output_section(Output_section*); |
| 2435 | |
| 2436 | // Set the final data size. |
| 2437 | void |
| 2438 | set_final_data_size(); |
| 2439 | |
| 2440 | // Write out the dynamic entries. |
| 2441 | void |
| 2442 | do_write(Output_file*); |
| 2443 | |
| 2444 | // Write to a map file. |
| 2445 | void |
| 2446 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2447 | { mapfile->print_output_data(this, _("** dynamic")); } |
| 2448 | |
| 2449 | private: |
| 2450 | // This POD class holds a single dynamic entry. |
| 2451 | class Dynamic_entry |
| 2452 | { |
| 2453 | public: |
| 2454 | // Create an entry with a fixed numeric value. |
| 2455 | Dynamic_entry(elfcpp::DT tag, unsigned int val) |
| 2456 | : tag_(tag), offset_(DYNAMIC_NUMBER) |
| 2457 | { this->u_.val = val; } |
| 2458 | |
| 2459 | // Create an entry with the size or address of a section. |
| 2460 | Dynamic_entry(elfcpp::DT tag, const Output_data* od, bool section_size) |
| 2461 | : tag_(tag), |
| 2462 | offset_(section_size |
| 2463 | ? DYNAMIC_SECTION_SIZE |
| 2464 | : DYNAMIC_SECTION_ADDRESS) |
| 2465 | { |
| 2466 | this->u_.od = od; |
| 2467 | this->od2 = NULL; |
| 2468 | } |
| 2469 | |
| 2470 | // Create an entry with the size of two sections. |
| 2471 | Dynamic_entry(elfcpp::DT tag, const Output_data* od, const Output_data* od2) |
| 2472 | : tag_(tag), |
| 2473 | offset_(DYNAMIC_SECTION_SIZE) |
| 2474 | { |
| 2475 | this->u_.od = od; |
| 2476 | this->od2 = od2; |
| 2477 | } |
| 2478 | |
| 2479 | // Create an entry with the address of a section plus a constant offset. |
| 2480 | Dynamic_entry(elfcpp::DT tag, const Output_data* od, unsigned int offset) |
| 2481 | : tag_(tag), |
| 2482 | offset_(offset) |
| 2483 | { this->u_.od = od; } |
| 2484 | |
| 2485 | // Create an entry with the address of a symbol. |
| 2486 | Dynamic_entry(elfcpp::DT tag, const Symbol* sym) |
| 2487 | : tag_(tag), offset_(DYNAMIC_SYMBOL) |
| 2488 | { this->u_.sym = sym; } |
| 2489 | |
| 2490 | // Create an entry with a string. |
| 2491 | Dynamic_entry(elfcpp::DT tag, const char* str) |
| 2492 | : tag_(tag), offset_(DYNAMIC_STRING) |
| 2493 | { this->u_.str = str; } |
| 2494 | |
| 2495 | // Return the tag of this entry. |
| 2496 | elfcpp::DT |
| 2497 | tag() const |
| 2498 | { return this->tag_; } |
| 2499 | |
| 2500 | // Write the dynamic entry to an output view. |
| 2501 | template<int size, bool big_endian> |
| 2502 | void |
| 2503 | write(unsigned char* pov, const Stringpool*) const; |
| 2504 | |
| 2505 | private: |
| 2506 | // Classification is encoded in the OFFSET field. |
| 2507 | enum Classification |
| 2508 | { |
| 2509 | // Section address. |
| 2510 | DYNAMIC_SECTION_ADDRESS = 0, |
| 2511 | // Number. |
| 2512 | DYNAMIC_NUMBER = -1U, |
| 2513 | // Section size. |
| 2514 | DYNAMIC_SECTION_SIZE = -2U, |
| 2515 | // Symbol adress. |
| 2516 | DYNAMIC_SYMBOL = -3U, |
| 2517 | // String. |
| 2518 | DYNAMIC_STRING = -4U |
| 2519 | // Any other value indicates a section address plus OFFSET. |
| 2520 | }; |
| 2521 | |
| 2522 | union |
| 2523 | { |
| 2524 | // For DYNAMIC_NUMBER. |
| 2525 | unsigned int val; |
| 2526 | // For DYNAMIC_SECTION_SIZE and section address plus OFFSET. |
| 2527 | const Output_data* od; |
| 2528 | // For DYNAMIC_SYMBOL. |
| 2529 | const Symbol* sym; |
| 2530 | // For DYNAMIC_STRING. |
| 2531 | const char* str; |
| 2532 | } u_; |
| 2533 | // For DYNAMIC_SYMBOL with two sections. |
| 2534 | const Output_data* od2; |
| 2535 | // The dynamic tag. |
| 2536 | elfcpp::DT tag_; |
| 2537 | // The type of entry (Classification) or offset within a section. |
| 2538 | unsigned int offset_; |
| 2539 | }; |
| 2540 | |
| 2541 | // Add an entry to the list. |
| 2542 | void |
| 2543 | add_entry(const Dynamic_entry& entry) |
| 2544 | { this->entries_.push_back(entry); } |
| 2545 | |
| 2546 | // Sized version of write function. |
| 2547 | template<int size, bool big_endian> |
| 2548 | void |
| 2549 | sized_write(Output_file* of); |
| 2550 | |
| 2551 | // The type of the list of entries. |
| 2552 | typedef std::vector<Dynamic_entry> Dynamic_entries; |
| 2553 | |
| 2554 | // The entries. |
| 2555 | Dynamic_entries entries_; |
| 2556 | // The pool used for strings. |
| 2557 | Stringpool* pool_; |
| 2558 | }; |
| 2559 | |
| 2560 | // Output_symtab_xindex is used to handle SHT_SYMTAB_SHNDX sections, |
| 2561 | // which may be required if the object file has more than |
| 2562 | // SHN_LORESERVE sections. |
| 2563 | |
| 2564 | class Output_symtab_xindex : public Output_section_data |
| 2565 | { |
| 2566 | public: |
| 2567 | Output_symtab_xindex(size_t symcount) |
| 2568 | : Output_section_data(symcount * 4, 4, true), |
| 2569 | entries_() |
| 2570 | { } |
| 2571 | |
| 2572 | // Add an entry: symbol number SYMNDX has section SHNDX. |
| 2573 | void |
| 2574 | add(unsigned int symndx, unsigned int shndx) |
| 2575 | { this->entries_.push_back(std::make_pair(symndx, shndx)); } |
| 2576 | |
| 2577 | protected: |
| 2578 | void |
| 2579 | do_write(Output_file*); |
| 2580 | |
| 2581 | // Write to a map file. |
| 2582 | void |
| 2583 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2584 | { mapfile->print_output_data(this, _("** symtab xindex")); } |
| 2585 | |
| 2586 | private: |
| 2587 | template<bool big_endian> |
| 2588 | void |
| 2589 | endian_do_write(unsigned char*); |
| 2590 | |
| 2591 | // It is likely that most symbols will not require entries. Rather |
| 2592 | // than keep a vector for all symbols, we keep pairs of symbol index |
| 2593 | // and section index. |
| 2594 | typedef std::vector<std::pair<unsigned int, unsigned int> > Xindex_entries; |
| 2595 | |
| 2596 | // The entries we need. |
| 2597 | Xindex_entries entries_; |
| 2598 | }; |
| 2599 | |
| 2600 | // A relaxed input section. |
| 2601 | class Output_relaxed_input_section : public Output_section_data_build |
| 2602 | { |
| 2603 | public: |
| 2604 | // We would like to call relobj->section_addralign(shndx) to get the |
| 2605 | // alignment but we do not want the constructor to fail. So callers |
| 2606 | // are repsonsible for ensuring that. |
| 2607 | Output_relaxed_input_section(Relobj* relobj, unsigned int shndx, |
| 2608 | uint64_t addralign) |
| 2609 | : Output_section_data_build(addralign), relobj_(relobj), shndx_(shndx) |
| 2610 | { } |
| 2611 | |
| 2612 | // Return the Relobj of this relaxed input section. |
| 2613 | Relobj* |
| 2614 | relobj() const |
| 2615 | { return this->relobj_; } |
| 2616 | |
| 2617 | // Return the section index of this relaxed input section. |
| 2618 | unsigned int |
| 2619 | shndx() const |
| 2620 | { return this->shndx_; } |
| 2621 | |
| 2622 | private: |
| 2623 | Relobj* relobj_; |
| 2624 | unsigned int shndx_; |
| 2625 | }; |
| 2626 | |
| 2627 | // This class describes properties of merge data sections. It is used |
| 2628 | // as a key type for maps. |
| 2629 | class Merge_section_properties |
| 2630 | { |
| 2631 | public: |
| 2632 | Merge_section_properties(bool is_string, uint64_t entsize, |
| 2633 | uint64_t addralign) |
| 2634 | : is_string_(is_string), entsize_(entsize), addralign_(addralign) |
| 2635 | { } |
| 2636 | |
| 2637 | // Whether this equals to another Merge_section_properties MSP. |
| 2638 | bool |
| 2639 | eq(const Merge_section_properties& msp) const |
| 2640 | { |
| 2641 | return ((this->is_string_ == msp.is_string_) |
| 2642 | && (this->entsize_ == msp.entsize_) |
| 2643 | && (this->addralign_ == msp.addralign_)); |
| 2644 | } |
| 2645 | |
| 2646 | // Compute a hash value for this using 64-bit FNV-1a hash. |
| 2647 | size_t |
| 2648 | hash_value() const |
| 2649 | { |
| 2650 | uint64_t h = 14695981039346656037ULL; // FNV offset basis. |
| 2651 | uint64_t prime = 1099511628211ULL; |
| 2652 | h = (h ^ static_cast<uint64_t>(this->is_string_)) * prime; |
| 2653 | h = (h ^ static_cast<uint64_t>(this->entsize_)) * prime; |
| 2654 | h = (h ^ static_cast<uint64_t>(this->addralign_)) * prime; |
| 2655 | return h; |
| 2656 | } |
| 2657 | |
| 2658 | // Functors for associative containers. |
| 2659 | struct equal_to |
| 2660 | { |
| 2661 | bool |
| 2662 | operator()(const Merge_section_properties& msp1, |
| 2663 | const Merge_section_properties& msp2) const |
| 2664 | { return msp1.eq(msp2); } |
| 2665 | }; |
| 2666 | |
| 2667 | struct hash |
| 2668 | { |
| 2669 | size_t |
| 2670 | operator()(const Merge_section_properties& msp) const |
| 2671 | { return msp.hash_value(); } |
| 2672 | }; |
| 2673 | |
| 2674 | private: |
| 2675 | // Whether this merge data section is for strings. |
| 2676 | bool is_string_; |
| 2677 | // Entsize of this merge data section. |
| 2678 | uint64_t entsize_; |
| 2679 | // Address alignment. |
| 2680 | uint64_t addralign_; |
| 2681 | }; |
| 2682 | |
| 2683 | // This class is used to speed up look up of special input sections in an |
| 2684 | // Output_section. |
| 2685 | |
| 2686 | class Output_section_lookup_maps |
| 2687 | { |
| 2688 | public: |
| 2689 | Output_section_lookup_maps() |
| 2690 | : is_valid_(true), merge_sections_by_properties_(), |
| 2691 | merge_sections_by_id_(), relaxed_input_sections_by_id_() |
| 2692 | { } |
| 2693 | |
| 2694 | // Whether the maps are valid. |
| 2695 | bool |
| 2696 | is_valid() const |
| 2697 | { return this->is_valid_; } |
| 2698 | |
| 2699 | // Invalidate the maps. |
| 2700 | void |
| 2701 | invalidate() |
| 2702 | { this->is_valid_ = false; } |
| 2703 | |
| 2704 | // Clear the maps. |
| 2705 | void |
| 2706 | clear() |
| 2707 | { |
| 2708 | this->merge_sections_by_properties_.clear(); |
| 2709 | this->merge_sections_by_id_.clear(); |
| 2710 | this->relaxed_input_sections_by_id_.clear(); |
| 2711 | // A cleared map is valid. |
| 2712 | this->is_valid_ = true; |
| 2713 | } |
| 2714 | |
| 2715 | // Find a merge section by merge section properties. Return NULL if none |
| 2716 | // is found. |
| 2717 | Output_merge_base* |
| 2718 | find_merge_section(const Merge_section_properties& msp) const |
| 2719 | { |
| 2720 | gold_assert(this->is_valid_); |
| 2721 | Merge_sections_by_properties::const_iterator p = |
| 2722 | this->merge_sections_by_properties_.find(msp); |
| 2723 | return p != this->merge_sections_by_properties_.end() ? p->second : NULL; |
| 2724 | } |
| 2725 | |
| 2726 | // Find a merge section by section ID of a merge input section. Return NULL |
| 2727 | // if none is found. |
| 2728 | Output_merge_base* |
| 2729 | find_merge_section(const Object* object, unsigned int shndx) const |
| 2730 | { |
| 2731 | gold_assert(this->is_valid_); |
| 2732 | Merge_sections_by_id::const_iterator p = |
| 2733 | this->merge_sections_by_id_.find(Const_section_id(object, shndx)); |
| 2734 | return p != this->merge_sections_by_id_.end() ? p->second : NULL; |
| 2735 | } |
| 2736 | |
| 2737 | // Add a merge section pointed by POMB with properties MSP. |
| 2738 | void |
| 2739 | add_merge_section(const Merge_section_properties& msp, |
| 2740 | Output_merge_base* pomb) |
| 2741 | { |
| 2742 | std::pair<Merge_section_properties, Output_merge_base*> value(msp, pomb); |
| 2743 | std::pair<Merge_sections_by_properties::iterator, bool> result = |
| 2744 | this->merge_sections_by_properties_.insert(value); |
| 2745 | gold_assert(result.second); |
| 2746 | } |
| 2747 | |
| 2748 | // Add a mapping from a merged input section in OBJECT with index SHNDX |
| 2749 | // to a merge output section pointed by POMB. |
| 2750 | void |
| 2751 | add_merge_input_section(const Object* object, unsigned int shndx, |
| 2752 | Output_merge_base* pomb) |
| 2753 | { |
| 2754 | Const_section_id csid(object, shndx); |
| 2755 | std::pair<Const_section_id, Output_merge_base*> value(csid, pomb); |
| 2756 | std::pair<Merge_sections_by_id::iterator, bool> result = |
| 2757 | this->merge_sections_by_id_.insert(value); |
| 2758 | gold_assert(result.second); |
| 2759 | } |
| 2760 | |
| 2761 | // Find a relaxed input section of OBJECT with index SHNDX. |
| 2762 | Output_relaxed_input_section* |
| 2763 | find_relaxed_input_section(const Object* object, unsigned int shndx) const |
| 2764 | { |
| 2765 | gold_assert(this->is_valid_); |
| 2766 | Relaxed_input_sections_by_id::const_iterator p = |
| 2767 | this->relaxed_input_sections_by_id_.find(Const_section_id(object, shndx)); |
| 2768 | return p != this->relaxed_input_sections_by_id_.end() ? p->second : NULL; |
| 2769 | } |
| 2770 | |
| 2771 | // Add a relaxed input section pointed by POMB and whose original input |
| 2772 | // section is in OBJECT with index SHNDX. |
| 2773 | void |
| 2774 | add_relaxed_input_section(const Relobj* relobj, unsigned int shndx, |
| 2775 | Output_relaxed_input_section* poris) |
| 2776 | { |
| 2777 | Const_section_id csid(relobj, shndx); |
| 2778 | std::pair<Const_section_id, Output_relaxed_input_section*> |
| 2779 | value(csid, poris); |
| 2780 | std::pair<Relaxed_input_sections_by_id::iterator, bool> result = |
| 2781 | this->relaxed_input_sections_by_id_.insert(value); |
| 2782 | gold_assert(result.second); |
| 2783 | } |
| 2784 | |
| 2785 | private: |
| 2786 | typedef Unordered_map<Const_section_id, Output_merge_base*, |
| 2787 | Const_section_id_hash> |
| 2788 | Merge_sections_by_id; |
| 2789 | |
| 2790 | typedef Unordered_map<Merge_section_properties, Output_merge_base*, |
| 2791 | Merge_section_properties::hash, |
| 2792 | Merge_section_properties::equal_to> |
| 2793 | Merge_sections_by_properties; |
| 2794 | |
| 2795 | typedef Unordered_map<Const_section_id, Output_relaxed_input_section*, |
| 2796 | Const_section_id_hash> |
| 2797 | Relaxed_input_sections_by_id; |
| 2798 | |
| 2799 | // Whether this is valid |
| 2800 | bool is_valid_; |
| 2801 | // Merge sections by merge section properties. |
| 2802 | Merge_sections_by_properties merge_sections_by_properties_; |
| 2803 | // Merge sections by section IDs. |
| 2804 | Merge_sections_by_id merge_sections_by_id_; |
| 2805 | // Relaxed sections by section IDs. |
| 2806 | Relaxed_input_sections_by_id relaxed_input_sections_by_id_; |
| 2807 | }; |
| 2808 | |
| 2809 | // This abstract base class defines the interface for the |
| 2810 | // types of methods used to fill free space left in an output |
| 2811 | // section during an incremental link. These methods are used |
| 2812 | // to insert dummy compilation units into debug info so that |
| 2813 | // debug info consumers can scan the debug info serially. |
| 2814 | |
| 2815 | class Output_fill |
| 2816 | { |
| 2817 | public: |
| 2818 | Output_fill() |
| 2819 | : is_big_endian_(parameters->target().is_big_endian()) |
| 2820 | { } |
| 2821 | |
| 2822 | // Return the smallest size chunk of free space that can be |
| 2823 | // filled with a dummy compilation unit. |
| 2824 | size_t |
| 2825 | minimum_hole_size() const |
| 2826 | { return this->do_minimum_hole_size(); } |
| 2827 | |
| 2828 | // Write a fill pattern of length LEN at offset OFF in the file. |
| 2829 | void |
| 2830 | write(Output_file* of, off_t off, size_t len) const |
| 2831 | { this->do_write(of, off, len); } |
| 2832 | |
| 2833 | protected: |
| 2834 | virtual size_t |
| 2835 | do_minimum_hole_size() const = 0; |
| 2836 | |
| 2837 | virtual void |
| 2838 | do_write(Output_file* of, off_t off, size_t len) const = 0; |
| 2839 | |
| 2840 | bool |
| 2841 | is_big_endian() const |
| 2842 | { return this->is_big_endian_; } |
| 2843 | |
| 2844 | private: |
| 2845 | bool is_big_endian_; |
| 2846 | }; |
| 2847 | |
| 2848 | // Fill method that introduces a dummy compilation unit in |
| 2849 | // a .debug_info or .debug_types section. |
| 2850 | |
| 2851 | class Output_fill_debug_info : public Output_fill |
| 2852 | { |
| 2853 | public: |
| 2854 | Output_fill_debug_info(bool is_debug_types) |
| 2855 | : is_debug_types_(is_debug_types) |
| 2856 | { } |
| 2857 | |
| 2858 | protected: |
| 2859 | virtual size_t |
| 2860 | do_minimum_hole_size() const; |
| 2861 | |
| 2862 | virtual void |
| 2863 | do_write(Output_file* of, off_t off, size_t len) const; |
| 2864 | |
| 2865 | private: |
| 2866 | // Version of the header. |
| 2867 | static const int version = 4; |
| 2868 | // True if this is a .debug_types section. |
| 2869 | bool is_debug_types_; |
| 2870 | }; |
| 2871 | |
| 2872 | // Fill method that introduces a dummy compilation unit in |
| 2873 | // a .debug_line section. |
| 2874 | |
| 2875 | class Output_fill_debug_line : public Output_fill |
| 2876 | { |
| 2877 | public: |
| 2878 | Output_fill_debug_line() |
| 2879 | { } |
| 2880 | |
| 2881 | protected: |
| 2882 | virtual size_t |
| 2883 | do_minimum_hole_size() const; |
| 2884 | |
| 2885 | virtual void |
| 2886 | do_write(Output_file* of, off_t off, size_t len) const; |
| 2887 | |
| 2888 | private: |
| 2889 | // Version of the header. We write a DWARF-3 header because it's smaller |
| 2890 | // and many tools have not yet been updated to understand the DWARF-4 header. |
| 2891 | static const int version = 3; |
| 2892 | // Length of the portion of the header that follows the header_length |
| 2893 | // field. This includes the following fields: |
| 2894 | // minimum_instruction_length, default_is_stmt, line_base, line_range, |
| 2895 | // opcode_base, standard_opcode_lengths[], include_directories, filenames. |
| 2896 | // The standard_opcode_lengths array is 12 bytes long, and the |
| 2897 | // include_directories and filenames fields each contain only a single |
| 2898 | // null byte. |
| 2899 | static const size_t header_length = 19; |
| 2900 | }; |
| 2901 | |
| 2902 | // An output section. We don't expect to have too many output |
| 2903 | // sections, so we don't bother to do a template on the size. |
| 2904 | |
| 2905 | class Output_section : public Output_data |
| 2906 | { |
| 2907 | public: |
| 2908 | // Create an output section, giving the name, type, and flags. |
| 2909 | Output_section(const char* name, elfcpp::Elf_Word, elfcpp::Elf_Xword); |
| 2910 | virtual ~Output_section(); |
| 2911 | |
| 2912 | // Add a new input section SHNDX, named NAME, with header SHDR, from |
| 2913 | // object OBJECT. RELOC_SHNDX is the index of a relocation section |
| 2914 | // which applies to this section, or 0 if none, or -1 if more than |
| 2915 | // one. HAVE_SECTIONS_SCRIPT is true if we have a SECTIONS clause |
| 2916 | // in a linker script; in that case we need to keep track of input |
| 2917 | // sections associated with an output section. Return the offset |
| 2918 | // within the output section. |
| 2919 | template<int size, bool big_endian> |
| 2920 | off_t |
| 2921 | add_input_section(Layout* layout, Sized_relobj_file<size, big_endian>* object, |
| 2922 | unsigned int shndx, const char* name, |
| 2923 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 2924 | unsigned int reloc_shndx, bool have_sections_script); |
| 2925 | |
| 2926 | // Add generated data POSD to this output section. |
| 2927 | void |
| 2928 | add_output_section_data(Output_section_data* posd); |
| 2929 | |
| 2930 | // Add a relaxed input section PORIS called NAME to this output section |
| 2931 | // with LAYOUT. |
| 2932 | void |
| 2933 | add_relaxed_input_section(Layout* layout, |
| 2934 | Output_relaxed_input_section* poris, |
| 2935 | const std::string& name); |
| 2936 | |
| 2937 | // Return the section name. |
| 2938 | const char* |
| 2939 | name() const |
| 2940 | { return this->name_; } |
| 2941 | |
| 2942 | // Return the section type. |
| 2943 | elfcpp::Elf_Word |
| 2944 | type() const |
| 2945 | { return this->type_; } |
| 2946 | |
| 2947 | // Return the section flags. |
| 2948 | elfcpp::Elf_Xword |
| 2949 | flags() const |
| 2950 | { return this->flags_; } |
| 2951 | |
| 2952 | typedef std::map<Section_id, unsigned int> Section_layout_order; |
| 2953 | |
| 2954 | void |
| 2955 | update_section_layout(const Section_layout_order* order_map); |
| 2956 | |
| 2957 | // Update the output section flags based on input section flags. |
| 2958 | void |
| 2959 | update_flags_for_input_section(elfcpp::Elf_Xword flags); |
| 2960 | |
| 2961 | // Return the entsize field. |
| 2962 | uint64_t |
| 2963 | entsize() const |
| 2964 | { return this->entsize_; } |
| 2965 | |
| 2966 | // Set the entsize field. |
| 2967 | void |
| 2968 | set_entsize(uint64_t v); |
| 2969 | |
| 2970 | // Set the load address. |
| 2971 | void |
| 2972 | set_load_address(uint64_t load_address) |
| 2973 | { |
| 2974 | this->load_address_ = load_address; |
| 2975 | this->has_load_address_ = true; |
| 2976 | } |
| 2977 | |
| 2978 | // Set the link field to the output section index of a section. |
| 2979 | void |
| 2980 | set_link_section(const Output_data* od) |
| 2981 | { |
| 2982 | gold_assert(this->link_ == 0 |
| 2983 | && !this->should_link_to_symtab_ |
| 2984 | && !this->should_link_to_dynsym_); |
| 2985 | this->link_section_ = od; |
| 2986 | } |
| 2987 | |
| 2988 | // Set the link field to a constant. |
| 2989 | void |
| 2990 | set_link(unsigned int v) |
| 2991 | { |
| 2992 | gold_assert(this->link_section_ == NULL |
| 2993 | && !this->should_link_to_symtab_ |
| 2994 | && !this->should_link_to_dynsym_); |
| 2995 | this->link_ = v; |
| 2996 | } |
| 2997 | |
| 2998 | // Record that this section should link to the normal symbol table. |
| 2999 | void |
| 3000 | set_should_link_to_symtab() |
| 3001 | { |
| 3002 | gold_assert(this->link_section_ == NULL |
| 3003 | && this->link_ == 0 |
| 3004 | && !this->should_link_to_dynsym_); |
| 3005 | this->should_link_to_symtab_ = true; |
| 3006 | } |
| 3007 | |
| 3008 | // Record that this section should link to the dynamic symbol table. |
| 3009 | void |
| 3010 | set_should_link_to_dynsym() |
| 3011 | { |
| 3012 | gold_assert(this->link_section_ == NULL |
| 3013 | && this->link_ == 0 |
| 3014 | && !this->should_link_to_symtab_); |
| 3015 | this->should_link_to_dynsym_ = true; |
| 3016 | } |
| 3017 | |
| 3018 | // Return the info field. |
| 3019 | unsigned int |
| 3020 | info() const |
| 3021 | { |
| 3022 | gold_assert(this->info_section_ == NULL |
| 3023 | && this->info_symndx_ == NULL); |
| 3024 | return this->info_; |
| 3025 | } |
| 3026 | |
| 3027 | // Set the info field to the output section index of a section. |
| 3028 | void |
| 3029 | set_info_section(const Output_section* os) |
| 3030 | { |
| 3031 | gold_assert((this->info_section_ == NULL |
| 3032 | || (this->info_section_ == os |
| 3033 | && this->info_uses_section_index_)) |
| 3034 | && this->info_symndx_ == NULL |
| 3035 | && this->info_ == 0); |
| 3036 | this->info_section_ = os; |
| 3037 | this->info_uses_section_index_= true; |
| 3038 | } |
| 3039 | |
| 3040 | // Set the info field to the symbol table index of a symbol. |
| 3041 | void |
| 3042 | set_info_symndx(const Symbol* sym) |
| 3043 | { |
| 3044 | gold_assert(this->info_section_ == NULL |
| 3045 | && (this->info_symndx_ == NULL |
| 3046 | || this->info_symndx_ == sym) |
| 3047 | && this->info_ == 0); |
| 3048 | this->info_symndx_ = sym; |
| 3049 | } |
| 3050 | |
| 3051 | // Set the info field to the symbol table index of a section symbol. |
| 3052 | void |
| 3053 | set_info_section_symndx(const Output_section* os) |
| 3054 | { |
| 3055 | gold_assert((this->info_section_ == NULL |
| 3056 | || (this->info_section_ == os |
| 3057 | && !this->info_uses_section_index_)) |
| 3058 | && this->info_symndx_ == NULL |
| 3059 | && this->info_ == 0); |
| 3060 | this->info_section_ = os; |
| 3061 | this->info_uses_section_index_ = false; |
| 3062 | } |
| 3063 | |
| 3064 | // Set the info field to a constant. |
| 3065 | void |
| 3066 | set_info(unsigned int v) |
| 3067 | { |
| 3068 | gold_assert(this->info_section_ == NULL |
| 3069 | && this->info_symndx_ == NULL |
| 3070 | && (this->info_ == 0 |
| 3071 | || this->info_ == v)); |
| 3072 | this->info_ = v; |
| 3073 | } |
| 3074 | |
| 3075 | // Set the addralign field. |
| 3076 | void |
| 3077 | set_addralign(uint64_t v) |
| 3078 | { this->addralign_ = v; } |
| 3079 | |
| 3080 | // Whether the output section index has been set. |
| 3081 | bool |
| 3082 | has_out_shndx() const |
| 3083 | { return this->out_shndx_ != -1U; } |
| 3084 | |
| 3085 | // Indicate that we need a symtab index. |
| 3086 | void |
| 3087 | set_needs_symtab_index() |
| 3088 | { this->needs_symtab_index_ = true; } |
| 3089 | |
| 3090 | // Return whether we need a symtab index. |
| 3091 | bool |
| 3092 | needs_symtab_index() const |
| 3093 | { return this->needs_symtab_index_; } |
| 3094 | |
| 3095 | // Get the symtab index. |
| 3096 | unsigned int |
| 3097 | symtab_index() const |
| 3098 | { |
| 3099 | gold_assert(this->symtab_index_ != 0); |
| 3100 | return this->symtab_index_; |
| 3101 | } |
| 3102 | |
| 3103 | // Set the symtab index. |
| 3104 | void |
| 3105 | set_symtab_index(unsigned int index) |
| 3106 | { |
| 3107 | gold_assert(index != 0); |
| 3108 | this->symtab_index_ = index; |
| 3109 | } |
| 3110 | |
| 3111 | // Indicate that we need a dynsym index. |
| 3112 | void |
| 3113 | set_needs_dynsym_index() |
| 3114 | { this->needs_dynsym_index_ = true; } |
| 3115 | |
| 3116 | // Return whether we need a dynsym index. |
| 3117 | bool |
| 3118 | needs_dynsym_index() const |
| 3119 | { return this->needs_dynsym_index_; } |
| 3120 | |
| 3121 | // Get the dynsym index. |
| 3122 | unsigned int |
| 3123 | dynsym_index() const |
| 3124 | { |
| 3125 | gold_assert(this->dynsym_index_ != 0); |
| 3126 | return this->dynsym_index_; |
| 3127 | } |
| 3128 | |
| 3129 | // Set the dynsym index. |
| 3130 | void |
| 3131 | set_dynsym_index(unsigned int index) |
| 3132 | { |
| 3133 | gold_assert(index != 0); |
| 3134 | this->dynsym_index_ = index; |
| 3135 | } |
| 3136 | |
| 3137 | // Return whether the input sections sections attachd to this output |
| 3138 | // section may require sorting. This is used to handle constructor |
| 3139 | // priorities compatibly with GNU ld. |
| 3140 | bool |
| 3141 | may_sort_attached_input_sections() const |
| 3142 | { return this->may_sort_attached_input_sections_; } |
| 3143 | |
| 3144 | // Record that the input sections attached to this output section |
| 3145 | // may require sorting. |
| 3146 | void |
| 3147 | set_may_sort_attached_input_sections() |
| 3148 | { this->may_sort_attached_input_sections_ = true; } |
| 3149 | |
| 3150 | // Returns true if input sections must be sorted according to the |
| 3151 | // order in which their name appear in the --section-ordering-file. |
| 3152 | bool |
| 3153 | input_section_order_specified() |
| 3154 | { return this->input_section_order_specified_; } |
| 3155 | |
| 3156 | // Record that input sections must be sorted as some of their names |
| 3157 | // match the patterns specified through --section-ordering-file. |
| 3158 | void |
| 3159 | set_input_section_order_specified() |
| 3160 | { this->input_section_order_specified_ = true; } |
| 3161 | |
| 3162 | // Return whether the input sections attached to this output section |
| 3163 | // require sorting. This is used to handle constructor priorities |
| 3164 | // compatibly with GNU ld. |
| 3165 | bool |
| 3166 | must_sort_attached_input_sections() const |
| 3167 | { return this->must_sort_attached_input_sections_; } |
| 3168 | |
| 3169 | // Record that the input sections attached to this output section |
| 3170 | // require sorting. |
| 3171 | void |
| 3172 | set_must_sort_attached_input_sections() |
| 3173 | { this->must_sort_attached_input_sections_ = true; } |
| 3174 | |
| 3175 | // Get the order in which this section appears in the PT_LOAD output |
| 3176 | // segment. |
| 3177 | Output_section_order |
| 3178 | order() const |
| 3179 | { return this->order_; } |
| 3180 | |
| 3181 | // Set the order for this section. |
| 3182 | void |
| 3183 | set_order(Output_section_order order) |
| 3184 | { this->order_ = order; } |
| 3185 | |
| 3186 | // Return whether this section holds relro data--data which has |
| 3187 | // dynamic relocations but which may be marked read-only after the |
| 3188 | // dynamic relocations have been completed. |
| 3189 | bool |
| 3190 | is_relro() const |
| 3191 | { return this->is_relro_; } |
| 3192 | |
| 3193 | // Record that this section holds relro data. |
| 3194 | void |
| 3195 | set_is_relro() |
| 3196 | { this->is_relro_ = true; } |
| 3197 | |
| 3198 | // Record that this section does not hold relro data. |
| 3199 | void |
| 3200 | clear_is_relro() |
| 3201 | { this->is_relro_ = false; } |
| 3202 | |
| 3203 | // True if this is a small section: a section which holds small |
| 3204 | // variables. |
| 3205 | bool |
| 3206 | is_small_section() const |
| 3207 | { return this->is_small_section_; } |
| 3208 | |
| 3209 | // Record that this is a small section. |
| 3210 | void |
| 3211 | set_is_small_section() |
| 3212 | { this->is_small_section_ = true; } |
| 3213 | |
| 3214 | // True if this is a large section: a section which holds large |
| 3215 | // variables. |
| 3216 | bool |
| 3217 | is_large_section() const |
| 3218 | { return this->is_large_section_; } |
| 3219 | |
| 3220 | // Record that this is a large section. |
| 3221 | void |
| 3222 | set_is_large_section() |
| 3223 | { this->is_large_section_ = true; } |
| 3224 | |
| 3225 | // True if this is a large data (not BSS) section. |
| 3226 | bool |
| 3227 | is_large_data_section() |
| 3228 | { return this->is_large_section_ && this->type_ != elfcpp::SHT_NOBITS; } |
| 3229 | |
| 3230 | // Return whether this section should be written after all the input |
| 3231 | // sections are complete. |
| 3232 | bool |
| 3233 | after_input_sections() const |
| 3234 | { return this->after_input_sections_; } |
| 3235 | |
| 3236 | // Record that this section should be written after all the input |
| 3237 | // sections are complete. |
| 3238 | void |
| 3239 | set_after_input_sections() |
| 3240 | { this->after_input_sections_ = true; } |
| 3241 | |
| 3242 | // Return whether this section requires postprocessing after all |
| 3243 | // relocations have been applied. |
| 3244 | bool |
| 3245 | requires_postprocessing() const |
| 3246 | { return this->requires_postprocessing_; } |
| 3247 | |
| 3248 | // If a section requires postprocessing, return the buffer to use. |
| 3249 | unsigned char* |
| 3250 | postprocessing_buffer() const |
| 3251 | { |
| 3252 | gold_assert(this->postprocessing_buffer_ != NULL); |
| 3253 | return this->postprocessing_buffer_; |
| 3254 | } |
| 3255 | |
| 3256 | // If a section requires postprocessing, create the buffer to use. |
| 3257 | void |
| 3258 | create_postprocessing_buffer(); |
| 3259 | |
| 3260 | // If a section requires postprocessing, this is the size of the |
| 3261 | // buffer to which relocations should be applied. |
| 3262 | off_t |
| 3263 | postprocessing_buffer_size() const |
| 3264 | { return this->current_data_size_for_child(); } |
| 3265 | |
| 3266 | // Modify the section name. This is only permitted for an |
| 3267 | // unallocated section, and only before the size has been finalized. |
| 3268 | // Otherwise the name will not get into Layout::namepool_. |
| 3269 | void |
| 3270 | set_name(const char* newname) |
| 3271 | { |
| 3272 | gold_assert((this->flags_ & elfcpp::SHF_ALLOC) == 0); |
| 3273 | gold_assert(!this->is_data_size_valid()); |
| 3274 | this->name_ = newname; |
| 3275 | } |
| 3276 | |
| 3277 | // Return whether the offset OFFSET in the input section SHNDX in |
| 3278 | // object OBJECT is being included in the link. |
| 3279 | bool |
| 3280 | is_input_address_mapped(const Relobj* object, unsigned int shndx, |
| 3281 | off_t offset) const; |
| 3282 | |
| 3283 | // Return the offset within the output section of OFFSET relative to |
| 3284 | // the start of input section SHNDX in object OBJECT. |
| 3285 | section_offset_type |
| 3286 | output_offset(const Relobj* object, unsigned int shndx, |
| 3287 | section_offset_type offset) const; |
| 3288 | |
| 3289 | // Return the output virtual address of OFFSET relative to the start |
| 3290 | // of input section SHNDX in object OBJECT. |
| 3291 | uint64_t |
| 3292 | output_address(const Relobj* object, unsigned int shndx, |
| 3293 | off_t offset) const; |
| 3294 | |
| 3295 | // Look for the merged section for input section SHNDX in object |
| 3296 | // OBJECT. If found, return true, and set *ADDR to the address of |
| 3297 | // the start of the merged section. This is not necessary the |
| 3298 | // output offset corresponding to input offset 0 in the section, |
| 3299 | // since the section may be mapped arbitrarily. |
| 3300 | bool |
| 3301 | find_starting_output_address(const Relobj* object, unsigned int shndx, |
| 3302 | uint64_t* addr) const; |
| 3303 | |
| 3304 | // Record that this output section was found in the SECTIONS clause |
| 3305 | // of a linker script. |
| 3306 | void |
| 3307 | set_found_in_sections_clause() |
| 3308 | { this->found_in_sections_clause_ = true; } |
| 3309 | |
| 3310 | // Return whether this output section was found in the SECTIONS |
| 3311 | // clause of a linker script. |
| 3312 | bool |
| 3313 | found_in_sections_clause() const |
| 3314 | { return this->found_in_sections_clause_; } |
| 3315 | |
| 3316 | // Write the section header into *OPHDR. |
| 3317 | template<int size, bool big_endian> |
| 3318 | void |
| 3319 | write_header(const Layout*, const Stringpool*, |
| 3320 | elfcpp::Shdr_write<size, big_endian>*) const; |
| 3321 | |
| 3322 | // The next few calls are for linker script support. |
| 3323 | |
| 3324 | // In some cases we need to keep a list of the input sections |
| 3325 | // associated with this output section. We only need the list if we |
| 3326 | // might have to change the offsets of the input section within the |
| 3327 | // output section after we add the input section. The ordinary |
| 3328 | // input sections will be written out when we process the object |
| 3329 | // file, and as such we don't need to track them here. We do need |
| 3330 | // to track Output_section_data objects here. We store instances of |
| 3331 | // this structure in a std::vector, so it must be a POD. There can |
| 3332 | // be many instances of this structure, so we use a union to save |
| 3333 | // some space. |
| 3334 | class Input_section |
| 3335 | { |
| 3336 | public: |
| 3337 | Input_section() |
| 3338 | : shndx_(0), p2align_(0) |
| 3339 | { |
| 3340 | this->u1_.data_size = 0; |
| 3341 | this->u2_.object = NULL; |
| 3342 | } |
| 3343 | |
| 3344 | // For an ordinary input section. |
| 3345 | Input_section(Relobj* object, unsigned int shndx, off_t data_size, |
| 3346 | uint64_t addralign) |
| 3347 | : shndx_(shndx), |
| 3348 | p2align_(ffsll(static_cast<long long>(addralign))), |
| 3349 | section_order_index_(0) |
| 3350 | { |
| 3351 | gold_assert(shndx != OUTPUT_SECTION_CODE |
| 3352 | && shndx != MERGE_DATA_SECTION_CODE |
| 3353 | && shndx != MERGE_STRING_SECTION_CODE |
| 3354 | && shndx != RELAXED_INPUT_SECTION_CODE); |
| 3355 | this->u1_.data_size = data_size; |
| 3356 | this->u2_.object = object; |
| 3357 | } |
| 3358 | |
| 3359 | // For a non-merge output section. |
| 3360 | Input_section(Output_section_data* posd) |
| 3361 | : shndx_(OUTPUT_SECTION_CODE), p2align_(0), |
| 3362 | section_order_index_(0) |
| 3363 | { |
| 3364 | this->u1_.data_size = 0; |
| 3365 | this->u2_.posd = posd; |
| 3366 | } |
| 3367 | |
| 3368 | // For a merge section. |
| 3369 | Input_section(Output_section_data* posd, bool is_string, uint64_t entsize) |
| 3370 | : shndx_(is_string |
| 3371 | ? MERGE_STRING_SECTION_CODE |
| 3372 | : MERGE_DATA_SECTION_CODE), |
| 3373 | p2align_(0), |
| 3374 | section_order_index_(0) |
| 3375 | { |
| 3376 | this->u1_.entsize = entsize; |
| 3377 | this->u2_.posd = posd; |
| 3378 | } |
| 3379 | |
| 3380 | // For a relaxed input section. |
| 3381 | Input_section(Output_relaxed_input_section* psection) |
| 3382 | : shndx_(RELAXED_INPUT_SECTION_CODE), p2align_(0), |
| 3383 | section_order_index_(0) |
| 3384 | { |
| 3385 | this->u1_.data_size = 0; |
| 3386 | this->u2_.poris = psection; |
| 3387 | } |
| 3388 | |
| 3389 | unsigned int |
| 3390 | section_order_index() const |
| 3391 | { |
| 3392 | return this->section_order_index_; |
| 3393 | } |
| 3394 | |
| 3395 | void |
| 3396 | set_section_order_index(unsigned int number) |
| 3397 | { |
| 3398 | this->section_order_index_ = number; |
| 3399 | } |
| 3400 | |
| 3401 | // The required alignment. |
| 3402 | uint64_t |
| 3403 | addralign() const |
| 3404 | { |
| 3405 | if (this->p2align_ != 0) |
| 3406 | return static_cast<uint64_t>(1) << (this->p2align_ - 1); |
| 3407 | else if (!this->is_input_section()) |
| 3408 | return this->u2_.posd->addralign(); |
| 3409 | else |
| 3410 | return 0; |
| 3411 | } |
| 3412 | |
| 3413 | // Set the required alignment, which must be either 0 or a power of 2. |
| 3414 | // For input sections that are sub-classes of Output_section_data, a |
| 3415 | // alignment of zero means asking the underlying object for alignment. |
| 3416 | void |
| 3417 | set_addralign(uint64_t addralign) |
| 3418 | { |
| 3419 | if (addralign == 0) |
| 3420 | this->p2align_ = 0; |
| 3421 | else |
| 3422 | { |
| 3423 | gold_assert((addralign & (addralign - 1)) == 0); |
| 3424 | this->p2align_ = ffsll(static_cast<long long>(addralign)); |
| 3425 | } |
| 3426 | } |
| 3427 | |
| 3428 | // Return the current required size, without finalization. |
| 3429 | off_t |
| 3430 | current_data_size() const; |
| 3431 | |
| 3432 | // Return the required size. |
| 3433 | off_t |
| 3434 | data_size() const; |
| 3435 | |
| 3436 | // Whether this is an input section. |
| 3437 | bool |
| 3438 | is_input_section() const |
| 3439 | { |
| 3440 | return (this->shndx_ != OUTPUT_SECTION_CODE |
| 3441 | && this->shndx_ != MERGE_DATA_SECTION_CODE |
| 3442 | && this->shndx_ != MERGE_STRING_SECTION_CODE |
| 3443 | && this->shndx_ != RELAXED_INPUT_SECTION_CODE); |
| 3444 | } |
| 3445 | |
| 3446 | // Return whether this is a merge section which matches the |
| 3447 | // parameters. |
| 3448 | bool |
| 3449 | is_merge_section(bool is_string, uint64_t entsize, |
| 3450 | uint64_t addralign) const |
| 3451 | { |
| 3452 | return (this->shndx_ == (is_string |
| 3453 | ? MERGE_STRING_SECTION_CODE |
| 3454 | : MERGE_DATA_SECTION_CODE) |
| 3455 | && this->u1_.entsize == entsize |
| 3456 | && this->addralign() == addralign); |
| 3457 | } |
| 3458 | |
| 3459 | // Return whether this is a merge section for some input section. |
| 3460 | bool |
| 3461 | is_merge_section() const |
| 3462 | { |
| 3463 | return (this->shndx_ == MERGE_DATA_SECTION_CODE |
| 3464 | || this->shndx_ == MERGE_STRING_SECTION_CODE); |
| 3465 | } |
| 3466 | |
| 3467 | // Return whether this is a relaxed input section. |
| 3468 | bool |
| 3469 | is_relaxed_input_section() const |
| 3470 | { return this->shndx_ == RELAXED_INPUT_SECTION_CODE; } |
| 3471 | |
| 3472 | // Return whether this is a generic Output_section_data. |
| 3473 | bool |
| 3474 | is_output_section_data() const |
| 3475 | { |
| 3476 | return this->shndx_ == OUTPUT_SECTION_CODE; |
| 3477 | } |
| 3478 | |
| 3479 | // Return the object for an input section. |
| 3480 | Relobj* |
| 3481 | relobj() const; |
| 3482 | |
| 3483 | // Return the input section index for an input section. |
| 3484 | unsigned int |
| 3485 | shndx() const; |
| 3486 | |
| 3487 | // For non-input-sections, return the associated Output_section_data |
| 3488 | // object. |
| 3489 | Output_section_data* |
| 3490 | output_section_data() const |
| 3491 | { |
| 3492 | gold_assert(!this->is_input_section()); |
| 3493 | return this->u2_.posd; |
| 3494 | } |
| 3495 | |
| 3496 | // For a merge section, return the Output_merge_base pointer. |
| 3497 | Output_merge_base* |
| 3498 | output_merge_base() const |
| 3499 | { |
| 3500 | gold_assert(this->is_merge_section()); |
| 3501 | return this->u2_.pomb; |
| 3502 | } |
| 3503 | |
| 3504 | // Return the Output_relaxed_input_section object. |
| 3505 | Output_relaxed_input_section* |
| 3506 | relaxed_input_section() const |
| 3507 | { |
| 3508 | gold_assert(this->is_relaxed_input_section()); |
| 3509 | return this->u2_.poris; |
| 3510 | } |
| 3511 | |
| 3512 | // Set the output section. |
| 3513 | void |
| 3514 | set_output_section(Output_section* os) |
| 3515 | { |
| 3516 | gold_assert(!this->is_input_section()); |
| 3517 | Output_section_data* posd = |
| 3518 | this->is_relaxed_input_section() ? this->u2_.poris : this->u2_.posd; |
| 3519 | posd->set_output_section(os); |
| 3520 | } |
| 3521 | |
| 3522 | // Set the address and file offset. This is called during |
| 3523 | // Layout::finalize. SECTION_FILE_OFFSET is the file offset of |
| 3524 | // the enclosing section. |
| 3525 | void |
| 3526 | set_address_and_file_offset(uint64_t address, off_t file_offset, |
| 3527 | off_t section_file_offset); |
| 3528 | |
| 3529 | // Reset the address and file offset. |
| 3530 | void |
| 3531 | reset_address_and_file_offset(); |
| 3532 | |
| 3533 | // Finalize the data size. |
| 3534 | void |
| 3535 | finalize_data_size(); |
| 3536 | |
| 3537 | // Add an input section, for SHF_MERGE sections. |
| 3538 | bool |
| 3539 | add_input_section(Relobj* object, unsigned int shndx) |
| 3540 | { |
| 3541 | gold_assert(this->shndx_ == MERGE_DATA_SECTION_CODE |
| 3542 | || this->shndx_ == MERGE_STRING_SECTION_CODE); |
| 3543 | return this->u2_.posd->add_input_section(object, shndx); |
| 3544 | } |
| 3545 | |
| 3546 | // Given an input OBJECT, an input section index SHNDX within that |
| 3547 | // object, and an OFFSET relative to the start of that input |
| 3548 | // section, return whether or not the output offset is known. If |
| 3549 | // this function returns true, it sets *POUTPUT to the offset in |
| 3550 | // the output section, relative to the start of the input section |
| 3551 | // in the output section. *POUTPUT may be different from OFFSET |
| 3552 | // for a merged section. |
| 3553 | bool |
| 3554 | output_offset(const Relobj* object, unsigned int shndx, |
| 3555 | section_offset_type offset, |
| 3556 | section_offset_type* poutput) const; |
| 3557 | |
| 3558 | // Return whether this is the merge section for the input section |
| 3559 | // SHNDX in OBJECT. |
| 3560 | bool |
| 3561 | is_merge_section_for(const Relobj* object, unsigned int shndx) const; |
| 3562 | |
| 3563 | // Write out the data. This does nothing for an input section. |
| 3564 | void |
| 3565 | write(Output_file*); |
| 3566 | |
| 3567 | // Write the data to a buffer. This does nothing for an input |
| 3568 | // section. |
| 3569 | void |
| 3570 | write_to_buffer(unsigned char*); |
| 3571 | |
| 3572 | // Print to a map file. |
| 3573 | void |
| 3574 | print_to_mapfile(Mapfile*) const; |
| 3575 | |
| 3576 | // Print statistics about merge sections to stderr. |
| 3577 | void |
| 3578 | print_merge_stats(const char* section_name) |
| 3579 | { |
| 3580 | if (this->shndx_ == MERGE_DATA_SECTION_CODE |
| 3581 | || this->shndx_ == MERGE_STRING_SECTION_CODE) |
| 3582 | this->u2_.posd->print_merge_stats(section_name); |
| 3583 | } |
| 3584 | |
| 3585 | private: |
| 3586 | // Code values which appear in shndx_. If the value is not one of |
| 3587 | // these codes, it is the input section index in the object file. |
| 3588 | enum |
| 3589 | { |
| 3590 | // An Output_section_data. |
| 3591 | OUTPUT_SECTION_CODE = -1U, |
| 3592 | // An Output_section_data for an SHF_MERGE section with |
| 3593 | // SHF_STRINGS not set. |
| 3594 | MERGE_DATA_SECTION_CODE = -2U, |
| 3595 | // An Output_section_data for an SHF_MERGE section with |
| 3596 | // SHF_STRINGS set. |
| 3597 | MERGE_STRING_SECTION_CODE = -3U, |
| 3598 | // An Output_section_data for a relaxed input section. |
| 3599 | RELAXED_INPUT_SECTION_CODE = -4U |
| 3600 | }; |
| 3601 | |
| 3602 | // For an ordinary input section, this is the section index in the |
| 3603 | // input file. For an Output_section_data, this is |
| 3604 | // OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or |
| 3605 | // MERGE_STRING_SECTION_CODE. |
| 3606 | unsigned int shndx_; |
| 3607 | // The required alignment, stored as a power of 2. |
| 3608 | unsigned int p2align_; |
| 3609 | union |
| 3610 | { |
| 3611 | // For an ordinary input section, the section size. |
| 3612 | off_t data_size; |
| 3613 | // For OUTPUT_SECTION_CODE or RELAXED_INPUT_SECTION_CODE, this is not |
| 3614 | // used. For MERGE_DATA_SECTION_CODE or MERGE_STRING_SECTION_CODE, the |
| 3615 | // entity size. |
| 3616 | uint64_t entsize; |
| 3617 | } u1_; |
| 3618 | union |
| 3619 | { |
| 3620 | // For an ordinary input section, the object which holds the |
| 3621 | // input section. |
| 3622 | Relobj* object; |
| 3623 | // For OUTPUT_SECTION_CODE or MERGE_DATA_SECTION_CODE or |
| 3624 | // MERGE_STRING_SECTION_CODE, the data. |
| 3625 | Output_section_data* posd; |
| 3626 | Output_merge_base* pomb; |
| 3627 | // For RELAXED_INPUT_SECTION_CODE, the data. |
| 3628 | Output_relaxed_input_section* poris; |
| 3629 | } u2_; |
| 3630 | // The line number of the pattern it matches in the --section-ordering-file |
| 3631 | // file. It is 0 if does not match any pattern. |
| 3632 | unsigned int section_order_index_; |
| 3633 | }; |
| 3634 | |
| 3635 | // Store the list of input sections for this Output_section into the |
| 3636 | // list passed in. This removes the input sections, leaving only |
| 3637 | // any Output_section_data elements. This returns the size of those |
| 3638 | // Output_section_data elements. ADDRESS is the address of this |
| 3639 | // output section. FILL is the fill value to use, in case there are |
| 3640 | // any spaces between the remaining Output_section_data elements. |
| 3641 | uint64_t |
| 3642 | get_input_sections(uint64_t address, const std::string& fill, |
| 3643 | std::list<Input_section>*); |
| 3644 | |
| 3645 | // Add a script input section. A script input section can either be |
| 3646 | // a plain input section or a sub-class of Output_section_data. |
| 3647 | void |
| 3648 | add_script_input_section(const Input_section& input_section); |
| 3649 | |
| 3650 | // Set the current size of the output section. |
| 3651 | void |
| 3652 | set_current_data_size(off_t size) |
| 3653 | { this->set_current_data_size_for_child(size); } |
| 3654 | |
| 3655 | // End of linker script support. |
| 3656 | |
| 3657 | // Save states before doing section layout. |
| 3658 | // This is used for relaxation. |
| 3659 | void |
| 3660 | save_states(); |
| 3661 | |
| 3662 | // Restore states prior to section layout. |
| 3663 | void |
| 3664 | restore_states(); |
| 3665 | |
| 3666 | // Discard states. |
| 3667 | void |
| 3668 | discard_states(); |
| 3669 | |
| 3670 | // Convert existing input sections to relaxed input sections. |
| 3671 | void |
| 3672 | convert_input_sections_to_relaxed_sections( |
| 3673 | const std::vector<Output_relaxed_input_section*>& sections); |
| 3674 | |
| 3675 | // Find a relaxed input section to an input section in OBJECT |
| 3676 | // with index SHNDX. Return NULL if none is found. |
| 3677 | const Output_relaxed_input_section* |
| 3678 | find_relaxed_input_section(const Relobj* object, unsigned int shndx) const; |
| 3679 | |
| 3680 | // Whether section offsets need adjustment due to relaxation. |
| 3681 | bool |
| 3682 | section_offsets_need_adjustment() const |
| 3683 | { return this->section_offsets_need_adjustment_; } |
| 3684 | |
| 3685 | // Set section_offsets_need_adjustment to be true. |
| 3686 | void |
| 3687 | set_section_offsets_need_adjustment() |
| 3688 | { this->section_offsets_need_adjustment_ = true; } |
| 3689 | |
| 3690 | // Adjust section offsets of input sections in this. This is |
| 3691 | // requires if relaxation caused some input sections to change sizes. |
| 3692 | void |
| 3693 | adjust_section_offsets(); |
| 3694 | |
| 3695 | // Whether this is a NOLOAD section. |
| 3696 | bool |
| 3697 | is_noload() const |
| 3698 | { return this->is_noload_; } |
| 3699 | |
| 3700 | // Set NOLOAD flag. |
| 3701 | void |
| 3702 | set_is_noload() |
| 3703 | { this->is_noload_ = true; } |
| 3704 | |
| 3705 | // Print merge statistics to stderr. |
| 3706 | void |
| 3707 | print_merge_stats(); |
| 3708 | |
| 3709 | // Set a fixed layout for the section. Used for incremental update links. |
| 3710 | void |
| 3711 | set_fixed_layout(uint64_t sh_addr, off_t sh_offset, off_t sh_size, |
| 3712 | uint64_t sh_addralign); |
| 3713 | |
| 3714 | // Return TRUE if the section has a fixed layout. |
| 3715 | bool |
| 3716 | has_fixed_layout() const |
| 3717 | { return this->has_fixed_layout_; } |
| 3718 | |
| 3719 | // Set flag to allow patch space for this section. Used for full |
| 3720 | // incremental links. |
| 3721 | void |
| 3722 | set_is_patch_space_allowed() |
| 3723 | { this->is_patch_space_allowed_ = true; } |
| 3724 | |
| 3725 | // Set a fill method to use for free space left in the output section |
| 3726 | // during incremental links. |
| 3727 | void |
| 3728 | set_free_space_fill(Output_fill* free_space_fill) |
| 3729 | { |
| 3730 | this->free_space_fill_ = free_space_fill; |
| 3731 | this->free_list_.set_min_hole_size(free_space_fill->minimum_hole_size()); |
| 3732 | } |
| 3733 | |
| 3734 | // Reserve space within the fixed layout for the section. Used for |
| 3735 | // incremental update links. |
| 3736 | void |
| 3737 | reserve(uint64_t sh_offset, uint64_t sh_size); |
| 3738 | |
| 3739 | // Allocate space from the free list for the section. Used for |
| 3740 | // incremental update links. |
| 3741 | off_t |
| 3742 | allocate(off_t len, uint64_t addralign); |
| 3743 | |
| 3744 | protected: |
| 3745 | // Return the output section--i.e., the object itself. |
| 3746 | Output_section* |
| 3747 | do_output_section() |
| 3748 | { return this; } |
| 3749 | |
| 3750 | const Output_section* |
| 3751 | do_output_section() const |
| 3752 | { return this; } |
| 3753 | |
| 3754 | // Return the section index in the output file. |
| 3755 | unsigned int |
| 3756 | do_out_shndx() const |
| 3757 | { |
| 3758 | gold_assert(this->out_shndx_ != -1U); |
| 3759 | return this->out_shndx_; |
| 3760 | } |
| 3761 | |
| 3762 | // Set the output section index. |
| 3763 | void |
| 3764 | do_set_out_shndx(unsigned int shndx) |
| 3765 | { |
| 3766 | gold_assert(this->out_shndx_ == -1U || this->out_shndx_ == shndx); |
| 3767 | this->out_shndx_ = shndx; |
| 3768 | } |
| 3769 | |
| 3770 | // Update the data size of the Output_section. For a typical |
| 3771 | // Output_section, there is nothing to do, but if there are any |
| 3772 | // Output_section_data objects we need to do a trial layout |
| 3773 | // here. |
| 3774 | virtual void |
| 3775 | update_data_size(); |
| 3776 | |
| 3777 | // Set the final data size of the Output_section. For a typical |
| 3778 | // Output_section, there is nothing to do, but if there are any |
| 3779 | // Output_section_data objects we need to set their final addresses |
| 3780 | // here. |
| 3781 | virtual void |
| 3782 | set_final_data_size(); |
| 3783 | |
| 3784 | // Reset the address and file offset. |
| 3785 | void |
| 3786 | do_reset_address_and_file_offset(); |
| 3787 | |
| 3788 | // Return true if address and file offset already have reset values. In |
| 3789 | // other words, calling reset_address_and_file_offset will not change them. |
| 3790 | bool |
| 3791 | do_address_and_file_offset_have_reset_values() const; |
| 3792 | |
| 3793 | // Write the data to the file. For a typical Output_section, this |
| 3794 | // does nothing: the data is written out by calling Object::Relocate |
| 3795 | // on each input object. But if there are any Output_section_data |
| 3796 | // objects we do need to write them out here. |
| 3797 | virtual void |
| 3798 | do_write(Output_file*); |
| 3799 | |
| 3800 | // Return the address alignment--function required by parent class. |
| 3801 | uint64_t |
| 3802 | do_addralign() const |
| 3803 | { return this->addralign_; } |
| 3804 | |
| 3805 | // Return whether there is a load address. |
| 3806 | bool |
| 3807 | do_has_load_address() const |
| 3808 | { return this->has_load_address_; } |
| 3809 | |
| 3810 | // Return the load address. |
| 3811 | uint64_t |
| 3812 | do_load_address() const |
| 3813 | { |
| 3814 | gold_assert(this->has_load_address_); |
| 3815 | return this->load_address_; |
| 3816 | } |
| 3817 | |
| 3818 | // Return whether this is an Output_section. |
| 3819 | bool |
| 3820 | do_is_section() const |
| 3821 | { return true; } |
| 3822 | |
| 3823 | // Return whether this is a section of the specified type. |
| 3824 | bool |
| 3825 | do_is_section_type(elfcpp::Elf_Word type) const |
| 3826 | { return this->type_ == type; } |
| 3827 | |
| 3828 | // Return whether the specified section flag is set. |
| 3829 | bool |
| 3830 | do_is_section_flag_set(elfcpp::Elf_Xword flag) const |
| 3831 | { return (this->flags_ & flag) != 0; } |
| 3832 | |
| 3833 | // Set the TLS offset. Called only for SHT_TLS sections. |
| 3834 | void |
| 3835 | do_set_tls_offset(uint64_t tls_base); |
| 3836 | |
| 3837 | // Return the TLS offset, relative to the base of the TLS segment. |
| 3838 | // Valid only for SHT_TLS sections. |
| 3839 | uint64_t |
| 3840 | do_tls_offset() const |
| 3841 | { return this->tls_offset_; } |
| 3842 | |
| 3843 | // This may be implemented by a child class. |
| 3844 | virtual void |
| 3845 | do_finalize_name(Layout*) |
| 3846 | { } |
| 3847 | |
| 3848 | // Print to the map file. |
| 3849 | virtual void |
| 3850 | do_print_to_mapfile(Mapfile*) const; |
| 3851 | |
| 3852 | // Record that this section requires postprocessing after all |
| 3853 | // relocations have been applied. This is called by a child class. |
| 3854 | void |
| 3855 | set_requires_postprocessing() |
| 3856 | { |
| 3857 | this->requires_postprocessing_ = true; |
| 3858 | this->after_input_sections_ = true; |
| 3859 | } |
| 3860 | |
| 3861 | // Write all the data of an Output_section into the postprocessing |
| 3862 | // buffer. |
| 3863 | void |
| 3864 | write_to_postprocessing_buffer(); |
| 3865 | |
| 3866 | typedef std::vector<Input_section> Input_section_list; |
| 3867 | |
| 3868 | // Allow a child class to access the input sections. |
| 3869 | const Input_section_list& |
| 3870 | input_sections() const |
| 3871 | { return this->input_sections_; } |
| 3872 | |
| 3873 | // Whether this always keeps an input section list |
| 3874 | bool |
| 3875 | always_keeps_input_sections() const |
| 3876 | { return this->always_keeps_input_sections_; } |
| 3877 | |
| 3878 | // Always keep an input section list. |
| 3879 | void |
| 3880 | set_always_keeps_input_sections() |
| 3881 | { |
| 3882 | gold_assert(this->current_data_size_for_child() == 0); |
| 3883 | this->always_keeps_input_sections_ = true; |
| 3884 | } |
| 3885 | |
| 3886 | private: |
| 3887 | // We only save enough information to undo the effects of section layout. |
| 3888 | class Checkpoint_output_section |
| 3889 | { |
| 3890 | public: |
| 3891 | Checkpoint_output_section(uint64_t addralign, elfcpp::Elf_Xword flags, |
| 3892 | const Input_section_list& input_sections, |
| 3893 | off_t first_input_offset, |
| 3894 | bool attached_input_sections_are_sorted) |
| 3895 | : addralign_(addralign), flags_(flags), |
| 3896 | input_sections_(input_sections), |
| 3897 | input_sections_size_(input_sections_.size()), |
| 3898 | input_sections_copy_(), first_input_offset_(first_input_offset), |
| 3899 | attached_input_sections_are_sorted_(attached_input_sections_are_sorted) |
| 3900 | { } |
| 3901 | |
| 3902 | virtual |
| 3903 | ~Checkpoint_output_section() |
| 3904 | { } |
| 3905 | |
| 3906 | // Return the address alignment. |
| 3907 | uint64_t |
| 3908 | addralign() const |
| 3909 | { return this->addralign_; } |
| 3910 | |
| 3911 | // Return the section flags. |
| 3912 | elfcpp::Elf_Xword |
| 3913 | flags() const |
| 3914 | { return this->flags_; } |
| 3915 | |
| 3916 | // Return a reference to the input section list copy. |
| 3917 | Input_section_list* |
| 3918 | input_sections() |
| 3919 | { return &this->input_sections_copy_; } |
| 3920 | |
| 3921 | // Return the size of input_sections at the time when checkpoint is |
| 3922 | // taken. |
| 3923 | size_t |
| 3924 | input_sections_size() const |
| 3925 | { return this->input_sections_size_; } |
| 3926 | |
| 3927 | // Whether input sections are copied. |
| 3928 | bool |
| 3929 | input_sections_saved() const |
| 3930 | { return this->input_sections_copy_.size() == this->input_sections_size_; } |
| 3931 | |
| 3932 | off_t |
| 3933 | first_input_offset() const |
| 3934 | { return this->first_input_offset_; } |
| 3935 | |
| 3936 | bool |
| 3937 | attached_input_sections_are_sorted() const |
| 3938 | { return this->attached_input_sections_are_sorted_; } |
| 3939 | |
| 3940 | // Save input sections. |
| 3941 | void |
| 3942 | save_input_sections() |
| 3943 | { |
| 3944 | this->input_sections_copy_.reserve(this->input_sections_size_); |
| 3945 | this->input_sections_copy_.clear(); |
| 3946 | Input_section_list::const_iterator p = this->input_sections_.begin(); |
| 3947 | gold_assert(this->input_sections_size_ >= this->input_sections_.size()); |
| 3948 | for(size_t i = 0; i < this->input_sections_size_ ; i++, ++p) |
| 3949 | this->input_sections_copy_.push_back(*p); |
| 3950 | } |
| 3951 | |
| 3952 | private: |
| 3953 | // The section alignment. |
| 3954 | uint64_t addralign_; |
| 3955 | // The section flags. |
| 3956 | elfcpp::Elf_Xword flags_; |
| 3957 | // Reference to the input sections to be checkpointed. |
| 3958 | const Input_section_list& input_sections_; |
| 3959 | // Size of the checkpointed portion of input_sections_; |
| 3960 | size_t input_sections_size_; |
| 3961 | // Copy of input sections. |
| 3962 | Input_section_list input_sections_copy_; |
| 3963 | // The offset of the first entry in input_sections_. |
| 3964 | off_t first_input_offset_; |
| 3965 | // True if the input sections attached to this output section have |
| 3966 | // already been sorted. |
| 3967 | bool attached_input_sections_are_sorted_; |
| 3968 | }; |
| 3969 | |
| 3970 | // This class is used to sort the input sections. |
| 3971 | class Input_section_sort_entry; |
| 3972 | |
| 3973 | // This is the sort comparison function for ctors and dtors. |
| 3974 | struct Input_section_sort_compare |
| 3975 | { |
| 3976 | bool |
| 3977 | operator()(const Input_section_sort_entry&, |
| 3978 | const Input_section_sort_entry&) const; |
| 3979 | }; |
| 3980 | |
| 3981 | // This is the sort comparison function for .init_array and .fini_array. |
| 3982 | struct Input_section_sort_init_fini_compare |
| 3983 | { |
| 3984 | bool |
| 3985 | operator()(const Input_section_sort_entry&, |
| 3986 | const Input_section_sort_entry&) const; |
| 3987 | }; |
| 3988 | |
| 3989 | // This is the sort comparison function when a section order is specified |
| 3990 | // from an input file. |
| 3991 | struct Input_section_sort_section_order_index_compare |
| 3992 | { |
| 3993 | bool |
| 3994 | operator()(const Input_section_sort_entry&, |
| 3995 | const Input_section_sort_entry&) const; |
| 3996 | }; |
| 3997 | |
| 3998 | // Fill data. This is used to fill in data between input sections. |
| 3999 | // It is also used for data statements (BYTE, WORD, etc.) in linker |
| 4000 | // scripts. When we have to keep track of the input sections, we |
| 4001 | // can use an Output_data_const, but we don't want to have to keep |
| 4002 | // track of input sections just to implement fills. |
| 4003 | class Fill |
| 4004 | { |
| 4005 | public: |
| 4006 | Fill(off_t section_offset, off_t length) |
| 4007 | : section_offset_(section_offset), |
| 4008 | length_(convert_to_section_size_type(length)) |
| 4009 | { } |
| 4010 | |
| 4011 | // Return section offset. |
| 4012 | off_t |
| 4013 | section_offset() const |
| 4014 | { return this->section_offset_; } |
| 4015 | |
| 4016 | // Return fill length. |
| 4017 | section_size_type |
| 4018 | length() const |
| 4019 | { return this->length_; } |
| 4020 | |
| 4021 | private: |
| 4022 | // The offset within the output section. |
| 4023 | off_t section_offset_; |
| 4024 | // The length of the space to fill. |
| 4025 | section_size_type length_; |
| 4026 | }; |
| 4027 | |
| 4028 | typedef std::vector<Fill> Fill_list; |
| 4029 | |
| 4030 | // Map used during relaxation of existing sections. This map |
| 4031 | // a section id an input section list index. We assume that |
| 4032 | // Input_section_list is a vector. |
| 4033 | typedef Unordered_map<Section_id, size_t, Section_id_hash> Relaxation_map; |
| 4034 | |
| 4035 | // Add a new output section by Input_section. |
| 4036 | void |
| 4037 | add_output_section_data(Input_section*); |
| 4038 | |
| 4039 | // Add an SHF_MERGE input section. Returns true if the section was |
| 4040 | // handled. If KEEPS_INPUT_SECTIONS is true, the output merge section |
| 4041 | // stores information about the merged input sections. |
| 4042 | bool |
| 4043 | add_merge_input_section(Relobj* object, unsigned int shndx, uint64_t flags, |
| 4044 | uint64_t entsize, uint64_t addralign, |
| 4045 | bool keeps_input_sections); |
| 4046 | |
| 4047 | // Add an output SHF_MERGE section POSD to this output section. |
| 4048 | // IS_STRING indicates whether it is a SHF_STRINGS section, and |
| 4049 | // ENTSIZE is the entity size. This returns the entry added to |
| 4050 | // input_sections_. |
| 4051 | void |
| 4052 | add_output_merge_section(Output_section_data* posd, bool is_string, |
| 4053 | uint64_t entsize); |
| 4054 | |
| 4055 | // Sort the attached input sections. |
| 4056 | void |
| 4057 | sort_attached_input_sections(); |
| 4058 | |
| 4059 | // Find the merge section into which an input section with index SHNDX in |
| 4060 | // OBJECT has been added. Return NULL if none found. |
| 4061 | Output_section_data* |
| 4062 | find_merge_section(const Relobj* object, unsigned int shndx) const; |
| 4063 | |
| 4064 | // Build a relaxation map. |
| 4065 | void |
| 4066 | build_relaxation_map( |
| 4067 | const Input_section_list& input_sections, |
| 4068 | size_t limit, |
| 4069 | Relaxation_map* map) const; |
| 4070 | |
| 4071 | // Convert input sections in an input section list into relaxed sections. |
| 4072 | void |
| 4073 | convert_input_sections_in_list_to_relaxed_sections( |
| 4074 | const std::vector<Output_relaxed_input_section*>& relaxed_sections, |
| 4075 | const Relaxation_map& map, |
| 4076 | Input_section_list* input_sections); |
| 4077 | |
| 4078 | // Build the lookup maps for merge and relaxed input sections. |
| 4079 | void |
| 4080 | build_lookup_maps() const; |
| 4081 | |
| 4082 | // Most of these fields are only valid after layout. |
| 4083 | |
| 4084 | // The name of the section. This will point into a Stringpool. |
| 4085 | const char* name_; |
| 4086 | // The section address is in the parent class. |
| 4087 | // The section alignment. |
| 4088 | uint64_t addralign_; |
| 4089 | // The section entry size. |
| 4090 | uint64_t entsize_; |
| 4091 | // The load address. This is only used when using a linker script |
| 4092 | // with a SECTIONS clause. The has_load_address_ field indicates |
| 4093 | // whether this field is valid. |
| 4094 | uint64_t load_address_; |
| 4095 | // The file offset is in the parent class. |
| 4096 | // Set the section link field to the index of this section. |
| 4097 | const Output_data* link_section_; |
| 4098 | // If link_section_ is NULL, this is the link field. |
| 4099 | unsigned int link_; |
| 4100 | // Set the section info field to the index of this section. |
| 4101 | const Output_section* info_section_; |
| 4102 | // If info_section_ is NULL, set the info field to the symbol table |
| 4103 | // index of this symbol. |
| 4104 | const Symbol* info_symndx_; |
| 4105 | // If info_section_ and info_symndx_ are NULL, this is the section |
| 4106 | // info field. |
| 4107 | unsigned int info_; |
| 4108 | // The section type. |
| 4109 | const elfcpp::Elf_Word type_; |
| 4110 | // The section flags. |
| 4111 | elfcpp::Elf_Xword flags_; |
| 4112 | // The order of this section in the output segment. |
| 4113 | Output_section_order order_; |
| 4114 | // The section index. |
| 4115 | unsigned int out_shndx_; |
| 4116 | // If there is a STT_SECTION for this output section in the normal |
| 4117 | // symbol table, this is the symbol index. This starts out as zero. |
| 4118 | // It is initialized in Layout::finalize() to be the index, or -1U |
| 4119 | // if there isn't one. |
| 4120 | unsigned int symtab_index_; |
| 4121 | // If there is a STT_SECTION for this output section in the dynamic |
| 4122 | // symbol table, this is the symbol index. This starts out as zero. |
| 4123 | // It is initialized in Layout::finalize() to be the index, or -1U |
| 4124 | // if there isn't one. |
| 4125 | unsigned int dynsym_index_; |
| 4126 | // The input sections. This will be empty in cases where we don't |
| 4127 | // need to keep track of them. |
| 4128 | Input_section_list input_sections_; |
| 4129 | // The offset of the first entry in input_sections_. |
| 4130 | off_t first_input_offset_; |
| 4131 | // The fill data. This is separate from input_sections_ because we |
| 4132 | // often will need fill sections without needing to keep track of |
| 4133 | // input sections. |
| 4134 | Fill_list fills_; |
| 4135 | // If the section requires postprocessing, this buffer holds the |
| 4136 | // section contents during relocation. |
| 4137 | unsigned char* postprocessing_buffer_; |
| 4138 | // Whether this output section needs a STT_SECTION symbol in the |
| 4139 | // normal symbol table. This will be true if there is a relocation |
| 4140 | // which needs it. |
| 4141 | bool needs_symtab_index_ : 1; |
| 4142 | // Whether this output section needs a STT_SECTION symbol in the |
| 4143 | // dynamic symbol table. This will be true if there is a dynamic |
| 4144 | // relocation which needs it. |
| 4145 | bool needs_dynsym_index_ : 1; |
| 4146 | // Whether the link field of this output section should point to the |
| 4147 | // normal symbol table. |
| 4148 | bool should_link_to_symtab_ : 1; |
| 4149 | // Whether the link field of this output section should point to the |
| 4150 | // dynamic symbol table. |
| 4151 | bool should_link_to_dynsym_ : 1; |
| 4152 | // Whether this section should be written after all the input |
| 4153 | // sections are complete. |
| 4154 | bool after_input_sections_ : 1; |
| 4155 | // Whether this section requires post processing after all |
| 4156 | // relocations have been applied. |
| 4157 | bool requires_postprocessing_ : 1; |
| 4158 | // Whether an input section was mapped to this output section |
| 4159 | // because of a SECTIONS clause in a linker script. |
| 4160 | bool found_in_sections_clause_ : 1; |
| 4161 | // Whether this section has an explicitly specified load address. |
| 4162 | bool has_load_address_ : 1; |
| 4163 | // True if the info_section_ field means the section index of the |
| 4164 | // section, false if it means the symbol index of the corresponding |
| 4165 | // section symbol. |
| 4166 | bool info_uses_section_index_ : 1; |
| 4167 | // True if input sections attached to this output section have to be |
| 4168 | // sorted according to a specified order. |
| 4169 | bool input_section_order_specified_ : 1; |
| 4170 | // True if the input sections attached to this output section may |
| 4171 | // need sorting. |
| 4172 | bool may_sort_attached_input_sections_ : 1; |
| 4173 | // True if the input sections attached to this output section must |
| 4174 | // be sorted. |
| 4175 | bool must_sort_attached_input_sections_ : 1; |
| 4176 | // True if the input sections attached to this output section have |
| 4177 | // already been sorted. |
| 4178 | bool attached_input_sections_are_sorted_ : 1; |
| 4179 | // True if this section holds relro data. |
| 4180 | bool is_relro_ : 1; |
| 4181 | // True if this is a small section. |
| 4182 | bool is_small_section_ : 1; |
| 4183 | // True if this is a large section. |
| 4184 | bool is_large_section_ : 1; |
| 4185 | // Whether code-fills are generated at write. |
| 4186 | bool generate_code_fills_at_write_ : 1; |
| 4187 | // Whether the entry size field should be zero. |
| 4188 | bool is_entsize_zero_ : 1; |
| 4189 | // Whether section offsets need adjustment due to relaxation. |
| 4190 | bool section_offsets_need_adjustment_ : 1; |
| 4191 | // Whether this is a NOLOAD section. |
| 4192 | bool is_noload_ : 1; |
| 4193 | // Whether this always keeps input section. |
| 4194 | bool always_keeps_input_sections_ : 1; |
| 4195 | // Whether this section has a fixed layout, for incremental update links. |
| 4196 | bool has_fixed_layout_ : 1; |
| 4197 | // True if we can add patch space to this section. |
| 4198 | bool is_patch_space_allowed_ : 1; |
| 4199 | // For SHT_TLS sections, the offset of this section relative to the base |
| 4200 | // of the TLS segment. |
| 4201 | uint64_t tls_offset_; |
| 4202 | // Saved checkpoint. |
| 4203 | Checkpoint_output_section* checkpoint_; |
| 4204 | // Fast lookup maps for merged and relaxed input sections. |
| 4205 | Output_section_lookup_maps* lookup_maps_; |
| 4206 | // List of available regions within the section, for incremental |
| 4207 | // update links. |
| 4208 | Free_list free_list_; |
| 4209 | // Method for filling chunks of free space. |
| 4210 | Output_fill* free_space_fill_; |
| 4211 | // Amount added as patch space for incremental linking. |
| 4212 | off_t patch_space_; |
| 4213 | }; |
| 4214 | |
| 4215 | // An output segment. PT_LOAD segments are built from collections of |
| 4216 | // output sections. Other segments typically point within PT_LOAD |
| 4217 | // segments, and are built directly as needed. |
| 4218 | // |
| 4219 | // NOTE: We want to use the copy constructor for this class. During |
| 4220 | // relaxation, we may try built the segments multiple times. We do |
| 4221 | // that by copying the original segment list before lay-out, doing |
| 4222 | // a trial lay-out and roll-back to the saved copied if we need to |
| 4223 | // to the lay-out again. |
| 4224 | |
| 4225 | class Output_segment |
| 4226 | { |
| 4227 | public: |
| 4228 | // Create an output segment, specifying the type and flags. |
| 4229 | Output_segment(elfcpp::Elf_Word, elfcpp::Elf_Word); |
| 4230 | |
| 4231 | // Return the virtual address. |
| 4232 | uint64_t |
| 4233 | vaddr() const |
| 4234 | { return this->vaddr_; } |
| 4235 | |
| 4236 | // Return the physical address. |
| 4237 | uint64_t |
| 4238 | paddr() const |
| 4239 | { return this->paddr_; } |
| 4240 | |
| 4241 | // Return the segment type. |
| 4242 | elfcpp::Elf_Word |
| 4243 | type() const |
| 4244 | { return this->type_; } |
| 4245 | |
| 4246 | // Return the segment flags. |
| 4247 | elfcpp::Elf_Word |
| 4248 | flags() const |
| 4249 | { return this->flags_; } |
| 4250 | |
| 4251 | // Return the memory size. |
| 4252 | uint64_t |
| 4253 | memsz() const |
| 4254 | { return this->memsz_; } |
| 4255 | |
| 4256 | // Return the file size. |
| 4257 | off_t |
| 4258 | filesz() const |
| 4259 | { return this->filesz_; } |
| 4260 | |
| 4261 | // Return the file offset. |
| 4262 | off_t |
| 4263 | offset() const |
| 4264 | { return this->offset_; } |
| 4265 | |
| 4266 | // Whether this is a segment created to hold large data sections. |
| 4267 | bool |
| 4268 | is_large_data_segment() const |
| 4269 | { return this->is_large_data_segment_; } |
| 4270 | |
| 4271 | // Record that this is a segment created to hold large data |
| 4272 | // sections. |
| 4273 | void |
| 4274 | set_is_large_data_segment() |
| 4275 | { this->is_large_data_segment_ = true; } |
| 4276 | |
| 4277 | // Return the maximum alignment of the Output_data. |
| 4278 | uint64_t |
| 4279 | maximum_alignment(); |
| 4280 | |
| 4281 | // Add the Output_section OS to this PT_LOAD segment. SEG_FLAGS is |
| 4282 | // the segment flags to use. |
| 4283 | void |
| 4284 | add_output_section_to_load(Layout* layout, Output_section* os, |
| 4285 | elfcpp::Elf_Word seg_flags); |
| 4286 | |
| 4287 | // Add the Output_section OS to this non-PT_LOAD segment. SEG_FLAGS |
| 4288 | // is the segment flags to use. |
| 4289 | void |
| 4290 | add_output_section_to_nonload(Output_section* os, |
| 4291 | elfcpp::Elf_Word seg_flags); |
| 4292 | |
| 4293 | // Remove an Output_section from this segment. It is an error if it |
| 4294 | // is not present. |
| 4295 | void |
| 4296 | remove_output_section(Output_section* os); |
| 4297 | |
| 4298 | // Add an Output_data (which need not be an Output_section) to the |
| 4299 | // start of this segment. |
| 4300 | void |
| 4301 | add_initial_output_data(Output_data*); |
| 4302 | |
| 4303 | // Return true if this segment has any sections which hold actual |
| 4304 | // data, rather than being a BSS section. |
| 4305 | bool |
| 4306 | has_any_data_sections() const; |
| 4307 | |
| 4308 | // Whether this segment has a dynamic relocs. |
| 4309 | bool |
| 4310 | has_dynamic_reloc() const; |
| 4311 | |
| 4312 | // Return the address of the first section. |
| 4313 | uint64_t |
| 4314 | first_section_load_address() const; |
| 4315 | |
| 4316 | // Return whether the addresses have been set already. |
| 4317 | bool |
| 4318 | are_addresses_set() const |
| 4319 | { return this->are_addresses_set_; } |
| 4320 | |
| 4321 | // Set the addresses. |
| 4322 | void |
| 4323 | set_addresses(uint64_t vaddr, uint64_t paddr) |
| 4324 | { |
| 4325 | this->vaddr_ = vaddr; |
| 4326 | this->paddr_ = paddr; |
| 4327 | this->are_addresses_set_ = true; |
| 4328 | } |
| 4329 | |
| 4330 | // Update the flags for the flags of an output section added to this |
| 4331 | // segment. |
| 4332 | void |
| 4333 | update_flags_for_output_section(elfcpp::Elf_Xword flags) |
| 4334 | { |
| 4335 | // The ELF ABI specifies that a PT_TLS segment should always have |
| 4336 | // PF_R as the flags. |
| 4337 | if (this->type() != elfcpp::PT_TLS) |
| 4338 | this->flags_ |= flags; |
| 4339 | } |
| 4340 | |
| 4341 | // Set the segment flags. This is only used if we have a PHDRS |
| 4342 | // clause which explicitly specifies the flags. |
| 4343 | void |
| 4344 | set_flags(elfcpp::Elf_Word flags) |
| 4345 | { this->flags_ = flags; } |
| 4346 | |
| 4347 | // Set the address of the segment to ADDR and the offset to *POFF |
| 4348 | // and set the addresses and offsets of all contained output |
| 4349 | // sections accordingly. Set the section indexes of all contained |
| 4350 | // output sections starting with *PSHNDX. If RESET is true, first |
| 4351 | // reset the addresses of the contained sections. Return the |
| 4352 | // address of the immediately following segment. Update *POFF and |
| 4353 | // *PSHNDX. This should only be called for a PT_LOAD segment. |
| 4354 | uint64_t |
| 4355 | set_section_addresses(Layout*, bool reset, uint64_t addr, |
| 4356 | unsigned int* increase_relro, bool* has_relro, |
| 4357 | off_t* poff, unsigned int* pshndx); |
| 4358 | |
| 4359 | // Set the minimum alignment of this segment. This may be adjusted |
| 4360 | // upward based on the section alignments. |
| 4361 | void |
| 4362 | set_minimum_p_align(uint64_t align) |
| 4363 | { |
| 4364 | if (align > this->min_p_align_) |
| 4365 | this->min_p_align_ = align; |
| 4366 | } |
| 4367 | |
| 4368 | // Set the offset of this segment based on the section. This should |
| 4369 | // only be called for a non-PT_LOAD segment. |
| 4370 | void |
| 4371 | set_offset(unsigned int increase); |
| 4372 | |
| 4373 | // Set the TLS offsets of the sections contained in the PT_TLS segment. |
| 4374 | void |
| 4375 | set_tls_offsets(); |
| 4376 | |
| 4377 | // Return the number of output sections. |
| 4378 | unsigned int |
| 4379 | output_section_count() const; |
| 4380 | |
| 4381 | // Return the section attached to the list segment with the lowest |
| 4382 | // load address. This is used when handling a PHDRS clause in a |
| 4383 | // linker script. |
| 4384 | Output_section* |
| 4385 | section_with_lowest_load_address() const; |
| 4386 | |
| 4387 | // Write the segment header into *OPHDR. |
| 4388 | template<int size, bool big_endian> |
| 4389 | void |
| 4390 | write_header(elfcpp::Phdr_write<size, big_endian>*); |
| 4391 | |
| 4392 | // Write the section headers of associated sections into V. |
| 4393 | template<int size, bool big_endian> |
| 4394 | unsigned char* |
| 4395 | write_section_headers(const Layout*, const Stringpool*, unsigned char* v, |
| 4396 | unsigned int* pshndx) const; |
| 4397 | |
| 4398 | // Print the output sections in the map file. |
| 4399 | void |
| 4400 | print_sections_to_mapfile(Mapfile*) const; |
| 4401 | |
| 4402 | private: |
| 4403 | typedef std::vector<Output_data*> Output_data_list; |
| 4404 | |
| 4405 | // Find the maximum alignment in an Output_data_list. |
| 4406 | static uint64_t |
| 4407 | maximum_alignment_list(const Output_data_list*); |
| 4408 | |
| 4409 | // Return whether the first data section is a relro section. |
| 4410 | bool |
| 4411 | is_first_section_relro() const; |
| 4412 | |
| 4413 | // Set the section addresses in an Output_data_list. |
| 4414 | uint64_t |
| 4415 | set_section_list_addresses(Layout*, bool reset, Output_data_list*, |
| 4416 | uint64_t addr, off_t* poff, unsigned int* pshndx, |
| 4417 | bool* in_tls); |
| 4418 | |
| 4419 | // Return the number of Output_sections in an Output_data_list. |
| 4420 | unsigned int |
| 4421 | output_section_count_list(const Output_data_list*) const; |
| 4422 | |
| 4423 | // Return whether an Output_data_list has a dynamic reloc. |
| 4424 | bool |
| 4425 | has_dynamic_reloc_list(const Output_data_list*) const; |
| 4426 | |
| 4427 | // Find the section with the lowest load address in an |
| 4428 | // Output_data_list. |
| 4429 | void |
| 4430 | lowest_load_address_in_list(const Output_data_list* pdl, |
| 4431 | Output_section** found, |
| 4432 | uint64_t* found_lma) const; |
| 4433 | |
| 4434 | // Find the first and last entries by address. |
| 4435 | void |
| 4436 | find_first_and_last_list(const Output_data_list* pdl, |
| 4437 | const Output_data** pfirst, |
| 4438 | const Output_data** plast) const; |
| 4439 | |
| 4440 | // Write the section headers in the list into V. |
| 4441 | template<int size, bool big_endian> |
| 4442 | unsigned char* |
| 4443 | write_section_headers_list(const Layout*, const Stringpool*, |
| 4444 | const Output_data_list*, unsigned char* v, |
| 4445 | unsigned int* pshdx) const; |
| 4446 | |
| 4447 | // Print a section list to the mapfile. |
| 4448 | void |
| 4449 | print_section_list_to_mapfile(Mapfile*, const Output_data_list*) const; |
| 4450 | |
| 4451 | // NOTE: We want to use the copy constructor. Currently, shallow copy |
| 4452 | // works for us so we do not need to write our own copy constructor. |
| 4453 | |
| 4454 | // The list of output data attached to this segment. |
| 4455 | Output_data_list output_lists_[ORDER_MAX]; |
| 4456 | // The segment virtual address. |
| 4457 | uint64_t vaddr_; |
| 4458 | // The segment physical address. |
| 4459 | uint64_t paddr_; |
| 4460 | // The size of the segment in memory. |
| 4461 | uint64_t memsz_; |
| 4462 | // The maximum section alignment. The is_max_align_known_ field |
| 4463 | // indicates whether this has been finalized. |
| 4464 | uint64_t max_align_; |
| 4465 | // The required minimum value for the p_align field. This is used |
| 4466 | // for PT_LOAD segments. Note that this does not mean that |
| 4467 | // addresses should be aligned to this value; it means the p_paddr |
| 4468 | // and p_vaddr fields must be congruent modulo this value. For |
| 4469 | // non-PT_LOAD segments, the dynamic linker works more efficiently |
| 4470 | // if the p_align field has the more conventional value, although it |
| 4471 | // can align as needed. |
| 4472 | uint64_t min_p_align_; |
| 4473 | // The offset of the segment data within the file. |
| 4474 | off_t offset_; |
| 4475 | // The size of the segment data in the file. |
| 4476 | off_t filesz_; |
| 4477 | // The segment type; |
| 4478 | elfcpp::Elf_Word type_; |
| 4479 | // The segment flags. |
| 4480 | elfcpp::Elf_Word flags_; |
| 4481 | // Whether we have finalized max_align_. |
| 4482 | bool is_max_align_known_ : 1; |
| 4483 | // Whether vaddr and paddr were set by a linker script. |
| 4484 | bool are_addresses_set_ : 1; |
| 4485 | // Whether this segment holds large data sections. |
| 4486 | bool is_large_data_segment_ : 1; |
| 4487 | }; |
| 4488 | |
| 4489 | // This class represents the output file. |
| 4490 | |
| 4491 | class Output_file |
| 4492 | { |
| 4493 | public: |
| 4494 | Output_file(const char* name); |
| 4495 | |
| 4496 | // Indicate that this is a temporary file which should not be |
| 4497 | // output. |
| 4498 | void |
| 4499 | set_is_temporary() |
| 4500 | { this->is_temporary_ = true; } |
| 4501 | |
| 4502 | // Try to open an existing file. Returns false if the file doesn't |
| 4503 | // exist, has a size of 0 or can't be mmaped. This method is |
| 4504 | // thread-unsafe. If BASE_NAME is not NULL, use the contents of |
| 4505 | // that file as the base for incremental linking. |
| 4506 | bool |
| 4507 | open_base_file(const char* base_name, bool writable); |
| 4508 | |
| 4509 | // Open the output file. FILE_SIZE is the final size of the file. |
| 4510 | // If the file already exists, it is deleted/truncated. This method |
| 4511 | // is thread-unsafe. |
| 4512 | void |
| 4513 | open(off_t file_size); |
| 4514 | |
| 4515 | // Resize the output file. This method is thread-unsafe. |
| 4516 | void |
| 4517 | resize(off_t file_size); |
| 4518 | |
| 4519 | // Close the output file (flushing all buffered data) and make sure |
| 4520 | // there are no errors. This method is thread-unsafe. |
| 4521 | void |
| 4522 | close(); |
| 4523 | |
| 4524 | // Return the size of this file. |
| 4525 | off_t |
| 4526 | filesize() |
| 4527 | { return this->file_size_; } |
| 4528 | |
| 4529 | // Return the name of this file. |
| 4530 | const char* |
| 4531 | filename() |
| 4532 | { return this->name_; } |
| 4533 | |
| 4534 | // We currently always use mmap which makes the view handling quite |
| 4535 | // simple. In the future we may support other approaches. |
| 4536 | |
| 4537 | // Write data to the output file. |
| 4538 | void |
| 4539 | write(off_t offset, const void* data, size_t len) |
| 4540 | { memcpy(this->base_ + offset, data, len); } |
| 4541 | |
| 4542 | // Get a buffer to use to write to the file, given the offset into |
| 4543 | // the file and the size. |
| 4544 | unsigned char* |
| 4545 | get_output_view(off_t start, size_t size) |
| 4546 | { |
| 4547 | gold_assert(start >= 0 |
| 4548 | && start + static_cast<off_t>(size) <= this->file_size_); |
| 4549 | return this->base_ + start; |
| 4550 | } |
| 4551 | |
| 4552 | // VIEW must have been returned by get_output_view. Write the |
| 4553 | // buffer to the file, passing in the offset and the size. |
| 4554 | void |
| 4555 | write_output_view(off_t, size_t, unsigned char*) |
| 4556 | { } |
| 4557 | |
| 4558 | // Get a read/write buffer. This is used when we want to write part |
| 4559 | // of the file, read it in, and write it again. |
| 4560 | unsigned char* |
| 4561 | get_input_output_view(off_t start, size_t size) |
| 4562 | { return this->get_output_view(start, size); } |
| 4563 | |
| 4564 | // Write a read/write buffer back to the file. |
| 4565 | void |
| 4566 | write_input_output_view(off_t, size_t, unsigned char*) |
| 4567 | { } |
| 4568 | |
| 4569 | // Get a read buffer. This is used when we just want to read part |
| 4570 | // of the file back it in. |
| 4571 | const unsigned char* |
| 4572 | get_input_view(off_t start, size_t size) |
| 4573 | { return this->get_output_view(start, size); } |
| 4574 | |
| 4575 | // Release a read bfufer. |
| 4576 | void |
| 4577 | free_input_view(off_t, size_t, const unsigned char*) |
| 4578 | { } |
| 4579 | |
| 4580 | private: |
| 4581 | // Map the file into memory or, if that fails, allocate anonymous |
| 4582 | // memory. |
| 4583 | void |
| 4584 | map(); |
| 4585 | |
| 4586 | // Allocate anonymous memory for the file. |
| 4587 | bool |
| 4588 | map_anonymous(); |
| 4589 | |
| 4590 | // Map the file into memory. |
| 4591 | bool |
| 4592 | map_no_anonymous(bool); |
| 4593 | |
| 4594 | // Unmap the file from memory (and flush to disk buffers). |
| 4595 | void |
| 4596 | unmap(); |
| 4597 | |
| 4598 | // File name. |
| 4599 | const char* name_; |
| 4600 | // File descriptor. |
| 4601 | int o_; |
| 4602 | // File size. |
| 4603 | off_t file_size_; |
| 4604 | // Base of file mapped into memory. |
| 4605 | unsigned char* base_; |
| 4606 | // True iff base_ points to a memory buffer rather than an output file. |
| 4607 | bool map_is_anonymous_; |
| 4608 | // True if base_ was allocated using new rather than mmap. |
| 4609 | bool map_is_allocated_; |
| 4610 | // True if this is a temporary file which should not be output. |
| 4611 | bool is_temporary_; |
| 4612 | }; |
| 4613 | |
| 4614 | } // End namespace gold. |
| 4615 | |
| 4616 | #endif // !defined(GOLD_OUTPUT_H) |