| 1 | // script-sections.cc -- linker script SECTIONS for gold |
| 2 | |
| 3 | // Copyright 2008, 2009 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cstring> |
| 26 | #include <algorithm> |
| 27 | #include <list> |
| 28 | #include <map> |
| 29 | #include <string> |
| 30 | #include <vector> |
| 31 | #include <fnmatch.h> |
| 32 | |
| 33 | #include "parameters.h" |
| 34 | #include "object.h" |
| 35 | #include "layout.h" |
| 36 | #include "output.h" |
| 37 | #include "script-c.h" |
| 38 | #include "script.h" |
| 39 | #include "script-sections.h" |
| 40 | |
| 41 | // Support for the SECTIONS clause in linker scripts. |
| 42 | |
| 43 | namespace gold |
| 44 | { |
| 45 | |
| 46 | // A region of memory. |
| 47 | class Memory_region |
| 48 | { |
| 49 | public: |
| 50 | Memory_region(const char* name, size_t namelen, unsigned int attributes, |
| 51 | Expression* start, Expression* length) |
| 52 | : name_(name, namelen), |
| 53 | attributes_(attributes), |
| 54 | start_(start), |
| 55 | length_(length), |
| 56 | current_vma_offset_(0), |
| 57 | current_lma_offset_(0), |
| 58 | vma_sections_(), |
| 59 | lma_sections_() |
| 60 | { } |
| 61 | |
| 62 | // Return the name of this region. |
| 63 | const std::string& |
| 64 | name() const |
| 65 | { return this->name_; } |
| 66 | |
| 67 | // Return the start address of this region. |
| 68 | Expression* |
| 69 | start_address() const |
| 70 | { return this->start_; } |
| 71 | |
| 72 | // Return the length of this region. |
| 73 | Expression* |
| 74 | length() const |
| 75 | { return this->length_; } |
| 76 | |
| 77 | // Print the region (when debugging). |
| 78 | void |
| 79 | print(FILE*) const; |
| 80 | |
| 81 | // Return true if <name,namelen> matches this region. |
| 82 | bool |
| 83 | name_match(const char* name, size_t namelen) |
| 84 | { |
| 85 | return (this->name_.length() == namelen |
| 86 | && strncmp(this->name_.c_str(), name, namelen) == 0); |
| 87 | } |
| 88 | |
| 89 | Expression* |
| 90 | get_current_vma_address(void) const |
| 91 | { |
| 92 | return |
| 93 | script_exp_binary_add(this->start_, |
| 94 | script_exp_integer(this->current_vma_offset_)); |
| 95 | } |
| 96 | |
| 97 | Expression* |
| 98 | get_current_lma_address(void) const |
| 99 | { |
| 100 | return |
| 101 | script_exp_binary_add(this->start_, |
| 102 | script_exp_integer(this->current_lma_offset_)); |
| 103 | } |
| 104 | |
| 105 | void |
| 106 | increment_vma_offset(std::string section_name, uint64_t amount, |
| 107 | const Symbol_table* symtab, const Layout* layout) |
| 108 | { |
| 109 | this->current_vma_offset_ += amount; |
| 110 | |
| 111 | if (this->current_vma_offset_ |
| 112 | > this->length_->eval(symtab, layout, false)) |
| 113 | gold_error (_("section %s overflows end of region %s"), |
| 114 | section_name.c_str(), this->name_.c_str()); |
| 115 | } |
| 116 | |
| 117 | void |
| 118 | increment_lma_offset(std::string section_name, uint64_t amount, |
| 119 | const Symbol_table* symtab, const Layout* layout) |
| 120 | { |
| 121 | this->current_lma_offset_ += amount; |
| 122 | |
| 123 | if (this->current_lma_offset_ |
| 124 | > this->length_->eval(symtab, layout, false)) |
| 125 | gold_error (_("section %s overflows end of region %s (based on load address)"), |
| 126 | section_name.c_str(), this->name_.c_str()); |
| 127 | } |
| 128 | |
| 129 | void |
| 130 | add_section(Output_section_definition* sec, bool vma) |
| 131 | { |
| 132 | if (vma) |
| 133 | this->vma_sections_.push_back(sec); |
| 134 | else |
| 135 | this->lma_sections_.push_back(sec); |
| 136 | } |
| 137 | |
| 138 | typedef std::vector<Output_section_definition*> Section_list; |
| 139 | |
| 140 | // Return the start of the list of sections |
| 141 | // whose VMAs are taken from this region. |
| 142 | Section_list::const_iterator |
| 143 | get_vma_section_list_start(void) const |
| 144 | { return this->vma_sections_.begin(); } |
| 145 | |
| 146 | // Return the start of the list of sections |
| 147 | // whose LMAs are taken from this region. |
| 148 | Section_list::const_iterator |
| 149 | get_lma_section_list_start(void) const |
| 150 | { return this->lma_sections_.begin(); } |
| 151 | |
| 152 | // Return the end of the list of sections |
| 153 | // whose VMAs are taken from this region. |
| 154 | Section_list::const_iterator |
| 155 | get_vma_section_list_end(void) const |
| 156 | { return this->vma_sections_.end(); } |
| 157 | |
| 158 | // Return the end of the list of sections |
| 159 | // whose LMAs are taken from this region. |
| 160 | Section_list::const_iterator |
| 161 | get_lma_section_list_end(void) const |
| 162 | { return this->lma_sections_.end(); } |
| 163 | |
| 164 | private: |
| 165 | |
| 166 | std::string name_; |
| 167 | unsigned int attributes_; |
| 168 | Expression* start_; |
| 169 | Expression* length_; |
| 170 | uint64_t current_vma_offset_; |
| 171 | uint64_t current_lma_offset_; |
| 172 | // A list of sections whose VMAs are set inside this region. |
| 173 | Section_list vma_sections_; |
| 174 | // A list of sections whose LMAs are set inside this region. |
| 175 | Section_list lma_sections_; |
| 176 | }; |
| 177 | |
| 178 | // Print a memory region. |
| 179 | |
| 180 | void |
| 181 | Memory_region::print(FILE* f) const |
| 182 | { |
| 183 | fprintf(f, " %s", this->name_.c_str()); |
| 184 | |
| 185 | unsigned int attrs = this->attributes_; |
| 186 | if (attrs != 0) |
| 187 | { |
| 188 | fprintf(f, " ("); |
| 189 | do |
| 190 | { |
| 191 | switch (attrs & - attrs) |
| 192 | { |
| 193 | case MEM_EXECUTABLE: fputc('x', f); break; |
| 194 | case MEM_WRITEABLE: fputc('w', f); break; |
| 195 | case MEM_READABLE: fputc('r', f); break; |
| 196 | case MEM_ALLOCATABLE: fputc('a', f); break; |
| 197 | case MEM_INITIALIZED: fputc('i', f); break; |
| 198 | default: |
| 199 | gold_unreachable(); |
| 200 | } |
| 201 | attrs &= ~ (attrs & - attrs); |
| 202 | } |
| 203 | while (attrs != 0); |
| 204 | fputc(')', f); |
| 205 | } |
| 206 | |
| 207 | fprintf(f, " : origin = "); |
| 208 | this->start_->print(f); |
| 209 | fprintf(f, ", length = "); |
| 210 | this->length_->print(f); |
| 211 | fprintf(f, "\n"); |
| 212 | } |
| 213 | |
| 214 | // Manage orphan sections. This is intended to be largely compatible |
| 215 | // with the GNU linker. The Linux kernel implicitly relies on |
| 216 | // something similar to the GNU linker's orphan placement. We |
| 217 | // originally used a simpler scheme here, but it caused the kernel |
| 218 | // build to fail, and was also rather inefficient. |
| 219 | |
| 220 | class Orphan_section_placement |
| 221 | { |
| 222 | private: |
| 223 | typedef Script_sections::Elements_iterator Elements_iterator; |
| 224 | |
| 225 | public: |
| 226 | Orphan_section_placement(); |
| 227 | |
| 228 | // Handle an output section during initialization of this mapping. |
| 229 | void |
| 230 | output_section_init(const std::string& name, Output_section*, |
| 231 | Elements_iterator location); |
| 232 | |
| 233 | // Initialize the last location. |
| 234 | void |
| 235 | last_init(Elements_iterator location); |
| 236 | |
| 237 | // Set *PWHERE to the address of an iterator pointing to the |
| 238 | // location to use for an orphan section. Return true if the |
| 239 | // iterator has a value, false otherwise. |
| 240 | bool |
| 241 | find_place(Output_section*, Elements_iterator** pwhere); |
| 242 | |
| 243 | // Return the iterator being used for sections at the very end of |
| 244 | // the linker script. |
| 245 | Elements_iterator |
| 246 | last_place() const; |
| 247 | |
| 248 | private: |
| 249 | // The places that we specifically recognize. This list is copied |
| 250 | // from the GNU linker. |
| 251 | enum Place_index |
| 252 | { |
| 253 | PLACE_TEXT, |
| 254 | PLACE_RODATA, |
| 255 | PLACE_DATA, |
| 256 | PLACE_TLS, |
| 257 | PLACE_TLS_BSS, |
| 258 | PLACE_BSS, |
| 259 | PLACE_REL, |
| 260 | PLACE_INTERP, |
| 261 | PLACE_NONALLOC, |
| 262 | PLACE_LAST, |
| 263 | PLACE_MAX |
| 264 | }; |
| 265 | |
| 266 | // The information we keep for a specific place. |
| 267 | struct Place |
| 268 | { |
| 269 | // The name of sections for this place. |
| 270 | const char* name; |
| 271 | // Whether we have a location for this place. |
| 272 | bool have_location; |
| 273 | // The iterator for this place. |
| 274 | Elements_iterator location; |
| 275 | }; |
| 276 | |
| 277 | // Initialize one place element. |
| 278 | void |
| 279 | initialize_place(Place_index, const char*); |
| 280 | |
| 281 | // The places. |
| 282 | Place places_[PLACE_MAX]; |
| 283 | // True if this is the first call to output_section_init. |
| 284 | bool first_init_; |
| 285 | }; |
| 286 | |
| 287 | // Initialize Orphan_section_placement. |
| 288 | |
| 289 | Orphan_section_placement::Orphan_section_placement() |
| 290 | : first_init_(true) |
| 291 | { |
| 292 | this->initialize_place(PLACE_TEXT, ".text"); |
| 293 | this->initialize_place(PLACE_RODATA, ".rodata"); |
| 294 | this->initialize_place(PLACE_DATA, ".data"); |
| 295 | this->initialize_place(PLACE_TLS, NULL); |
| 296 | this->initialize_place(PLACE_TLS_BSS, NULL); |
| 297 | this->initialize_place(PLACE_BSS, ".bss"); |
| 298 | this->initialize_place(PLACE_REL, NULL); |
| 299 | this->initialize_place(PLACE_INTERP, ".interp"); |
| 300 | this->initialize_place(PLACE_NONALLOC, NULL); |
| 301 | this->initialize_place(PLACE_LAST, NULL); |
| 302 | } |
| 303 | |
| 304 | // Initialize one place element. |
| 305 | |
| 306 | void |
| 307 | Orphan_section_placement::initialize_place(Place_index index, const char* name) |
| 308 | { |
| 309 | this->places_[index].name = name; |
| 310 | this->places_[index].have_location = false; |
| 311 | } |
| 312 | |
| 313 | // While initializing the Orphan_section_placement information, this |
| 314 | // is called once for each output section named in the linker script. |
| 315 | // If we found an output section during the link, it will be passed in |
| 316 | // OS. |
| 317 | |
| 318 | void |
| 319 | Orphan_section_placement::output_section_init(const std::string& name, |
| 320 | Output_section* os, |
| 321 | Elements_iterator location) |
| 322 | { |
| 323 | bool first_init = this->first_init_; |
| 324 | this->first_init_ = false; |
| 325 | |
| 326 | for (int i = 0; i < PLACE_MAX; ++i) |
| 327 | { |
| 328 | if (this->places_[i].name != NULL && this->places_[i].name == name) |
| 329 | { |
| 330 | if (this->places_[i].have_location) |
| 331 | { |
| 332 | // We have already seen a section with this name. |
| 333 | return; |
| 334 | } |
| 335 | |
| 336 | this->places_[i].location = location; |
| 337 | this->places_[i].have_location = true; |
| 338 | |
| 339 | // If we just found the .bss section, restart the search for |
| 340 | // an unallocated section. This follows the GNU linker's |
| 341 | // behaviour. |
| 342 | if (i == PLACE_BSS) |
| 343 | this->places_[PLACE_NONALLOC].have_location = false; |
| 344 | |
| 345 | return; |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | // Relocation sections. |
| 350 | if (!this->places_[PLACE_REL].have_location |
| 351 | && os != NULL |
| 352 | && (os->type() == elfcpp::SHT_REL || os->type() == elfcpp::SHT_RELA) |
| 353 | && (os->flags() & elfcpp::SHF_ALLOC) != 0) |
| 354 | { |
| 355 | this->places_[PLACE_REL].location = location; |
| 356 | this->places_[PLACE_REL].have_location = true; |
| 357 | } |
| 358 | |
| 359 | // We find the location for unallocated sections by finding the |
| 360 | // first debugging or comment section after the BSS section (if |
| 361 | // there is one). |
| 362 | if (!this->places_[PLACE_NONALLOC].have_location |
| 363 | && (name == ".comment" || Layout::is_debug_info_section(name.c_str()))) |
| 364 | { |
| 365 | // We add orphan sections after the location in PLACES_. We |
| 366 | // want to store unallocated sections before LOCATION. If this |
| 367 | // is the very first section, we can't use it. |
| 368 | if (!first_init) |
| 369 | { |
| 370 | --location; |
| 371 | this->places_[PLACE_NONALLOC].location = location; |
| 372 | this->places_[PLACE_NONALLOC].have_location = true; |
| 373 | } |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | // Initialize the last location. |
| 378 | |
| 379 | void |
| 380 | Orphan_section_placement::last_init(Elements_iterator location) |
| 381 | { |
| 382 | this->places_[PLACE_LAST].location = location; |
| 383 | this->places_[PLACE_LAST].have_location = true; |
| 384 | } |
| 385 | |
| 386 | // Set *PWHERE to the address of an iterator pointing to the location |
| 387 | // to use for an orphan section. Return true if the iterator has a |
| 388 | // value, false otherwise. |
| 389 | |
| 390 | bool |
| 391 | Orphan_section_placement::find_place(Output_section* os, |
| 392 | Elements_iterator** pwhere) |
| 393 | { |
| 394 | // Figure out where OS should go. This is based on the GNU linker |
| 395 | // code. FIXME: The GNU linker handles small data sections |
| 396 | // specially, but we don't. |
| 397 | elfcpp::Elf_Word type = os->type(); |
| 398 | elfcpp::Elf_Xword flags = os->flags(); |
| 399 | Place_index index; |
| 400 | if ((flags & elfcpp::SHF_ALLOC) == 0 |
| 401 | && !Layout::is_debug_info_section(os->name())) |
| 402 | index = PLACE_NONALLOC; |
| 403 | else if ((flags & elfcpp::SHF_ALLOC) == 0) |
| 404 | index = PLACE_LAST; |
| 405 | else if (type == elfcpp::SHT_NOTE) |
| 406 | index = PLACE_INTERP; |
| 407 | else if ((flags & elfcpp::SHF_TLS) != 0) |
| 408 | { |
| 409 | if (type == elfcpp::SHT_NOBITS) |
| 410 | index = PLACE_TLS_BSS; |
| 411 | else |
| 412 | index = PLACE_TLS; |
| 413 | } |
| 414 | else if (type == elfcpp::SHT_NOBITS) |
| 415 | index = PLACE_BSS; |
| 416 | else if ((flags & elfcpp::SHF_WRITE) != 0) |
| 417 | index = PLACE_DATA; |
| 418 | else if (type == elfcpp::SHT_REL || type == elfcpp::SHT_RELA) |
| 419 | index = PLACE_REL; |
| 420 | else if ((flags & elfcpp::SHF_EXECINSTR) == 0) |
| 421 | index = PLACE_RODATA; |
| 422 | else |
| 423 | index = PLACE_TEXT; |
| 424 | |
| 425 | // If we don't have a location yet, try to find one based on a |
| 426 | // plausible ordering of sections. |
| 427 | if (!this->places_[index].have_location) |
| 428 | { |
| 429 | Place_index follow; |
| 430 | switch (index) |
| 431 | { |
| 432 | default: |
| 433 | follow = PLACE_MAX; |
| 434 | break; |
| 435 | case PLACE_RODATA: |
| 436 | follow = PLACE_TEXT; |
| 437 | break; |
| 438 | case PLACE_BSS: |
| 439 | follow = PLACE_DATA; |
| 440 | break; |
| 441 | case PLACE_REL: |
| 442 | follow = PLACE_TEXT; |
| 443 | break; |
| 444 | case PLACE_INTERP: |
| 445 | follow = PLACE_TEXT; |
| 446 | break; |
| 447 | case PLACE_TLS: |
| 448 | follow = PLACE_DATA; |
| 449 | break; |
| 450 | case PLACE_TLS_BSS: |
| 451 | follow = PLACE_TLS; |
| 452 | if (!this->places_[PLACE_TLS].have_location) |
| 453 | follow = PLACE_DATA; |
| 454 | break; |
| 455 | } |
| 456 | if (follow != PLACE_MAX && this->places_[follow].have_location) |
| 457 | { |
| 458 | // Set the location of INDEX to the location of FOLLOW. The |
| 459 | // location of INDEX will then be incremented by the caller, |
| 460 | // so anything in INDEX will continue to be after anything |
| 461 | // in FOLLOW. |
| 462 | this->places_[index].location = this->places_[follow].location; |
| 463 | this->places_[index].have_location = true; |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | *pwhere = &this->places_[index].location; |
| 468 | bool ret = this->places_[index].have_location; |
| 469 | |
| 470 | // The caller will set the location. |
| 471 | this->places_[index].have_location = true; |
| 472 | |
| 473 | return ret; |
| 474 | } |
| 475 | |
| 476 | // Return the iterator being used for sections at the very end of the |
| 477 | // linker script. |
| 478 | |
| 479 | Orphan_section_placement::Elements_iterator |
| 480 | Orphan_section_placement::last_place() const |
| 481 | { |
| 482 | gold_assert(this->places_[PLACE_LAST].have_location); |
| 483 | return this->places_[PLACE_LAST].location; |
| 484 | } |
| 485 | |
| 486 | // An element in a SECTIONS clause. |
| 487 | |
| 488 | class Sections_element |
| 489 | { |
| 490 | public: |
| 491 | Sections_element() |
| 492 | { } |
| 493 | |
| 494 | virtual ~Sections_element() |
| 495 | { } |
| 496 | |
| 497 | // Return whether an output section is relro. |
| 498 | virtual bool |
| 499 | is_relro() const |
| 500 | { return false; } |
| 501 | |
| 502 | // Record that an output section is relro. |
| 503 | virtual void |
| 504 | set_is_relro() |
| 505 | { } |
| 506 | |
| 507 | // Create any required output sections. The only real |
| 508 | // implementation is in Output_section_definition. |
| 509 | virtual void |
| 510 | create_sections(Layout*) |
| 511 | { } |
| 512 | |
| 513 | // Add any symbol being defined to the symbol table. |
| 514 | virtual void |
| 515 | add_symbols_to_table(Symbol_table*) |
| 516 | { } |
| 517 | |
| 518 | // Finalize symbols and check assertions. |
| 519 | virtual void |
| 520 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*) |
| 521 | { } |
| 522 | |
| 523 | // Return the output section name to use for an input file name and |
| 524 | // section name. This only real implementation is in |
| 525 | // Output_section_definition. |
| 526 | virtual const char* |
| 527 | output_section_name(const char*, const char*, Output_section***, |
| 528 | Script_sections::Section_type*) |
| 529 | { return NULL; } |
| 530 | |
| 531 | // Initialize OSP with an output section. |
| 532 | virtual void |
| 533 | orphan_section_init(Orphan_section_placement*, |
| 534 | Script_sections::Elements_iterator) |
| 535 | { } |
| 536 | |
| 537 | // Set section addresses. This includes applying assignments if the |
| 538 | // the expression is an absolute value. |
| 539 | virtual void |
| 540 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*, |
| 541 | uint64_t*) |
| 542 | { } |
| 543 | |
| 544 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
| 545 | // this section is constrained, and the input sections do not match, |
| 546 | // return the constraint, and set *POSD. |
| 547 | virtual Section_constraint |
| 548 | check_constraint(Output_section_definition**) |
| 549 | { return CONSTRAINT_NONE; } |
| 550 | |
| 551 | // See if this is the alternate output section for a constrained |
| 552 | // output section. If it is, transfer the Output_section and return |
| 553 | // true. Otherwise return false. |
| 554 | virtual bool |
| 555 | alternate_constraint(Output_section_definition*, Section_constraint) |
| 556 | { return false; } |
| 557 | |
| 558 | // Get the list of segments to use for an allocated section when |
| 559 | // using a PHDRS clause. If this is an allocated section, return |
| 560 | // the Output_section, and set *PHDRS_LIST (the first parameter) to |
| 561 | // the list of PHDRS to which it should be attached. If the PHDRS |
| 562 | // were not specified, don't change *PHDRS_LIST. When not returning |
| 563 | // NULL, set *ORPHAN (the second parameter) according to whether |
| 564 | // this is an orphan section--one that is not mentioned in the |
| 565 | // linker script. |
| 566 | virtual Output_section* |
| 567 | allocate_to_segment(String_list**, bool*) |
| 568 | { return NULL; } |
| 569 | |
| 570 | // Look for an output section by name and return the address, the |
| 571 | // load address, the alignment, and the size. This is used when an |
| 572 | // expression refers to an output section which was not actually |
| 573 | // created. This returns true if the section was found, false |
| 574 | // otherwise. The only real definition is for |
| 575 | // Output_section_definition. |
| 576 | virtual bool |
| 577 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, |
| 578 | uint64_t*) const |
| 579 | { return false; } |
| 580 | |
| 581 | // Return the associated Output_section if there is one. |
| 582 | virtual Output_section* |
| 583 | get_output_section() const |
| 584 | { return NULL; } |
| 585 | |
| 586 | // Set the section's memory regions. |
| 587 | virtual void |
| 588 | set_memory_region(Memory_region*, bool) |
| 589 | { gold_error(_("Attempt to set a memory region for a non-output section")); } |
| 590 | |
| 591 | // Print the element for debugging purposes. |
| 592 | virtual void |
| 593 | print(FILE* f) const = 0; |
| 594 | }; |
| 595 | |
| 596 | // An assignment in a SECTIONS clause outside of an output section. |
| 597 | |
| 598 | class Sections_element_assignment : public Sections_element |
| 599 | { |
| 600 | public: |
| 601 | Sections_element_assignment(const char* name, size_t namelen, |
| 602 | Expression* val, bool provide, bool hidden) |
| 603 | : assignment_(name, namelen, false, val, provide, hidden) |
| 604 | { } |
| 605 | |
| 606 | // Add the symbol to the symbol table. |
| 607 | void |
| 608 | add_symbols_to_table(Symbol_table* symtab) |
| 609 | { this->assignment_.add_to_table(symtab); } |
| 610 | |
| 611 | // Finalize the symbol. |
| 612 | void |
| 613 | finalize_symbols(Symbol_table* symtab, const Layout* layout, |
| 614 | uint64_t* dot_value) |
| 615 | { |
| 616 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, NULL); |
| 617 | } |
| 618 | |
| 619 | // Set the section address. There is no section here, but if the |
| 620 | // value is absolute, we set the symbol. This permits us to use |
| 621 | // absolute symbols when setting dot. |
| 622 | void |
| 623 | set_section_addresses(Symbol_table* symtab, Layout* layout, |
| 624 | uint64_t* dot_value, uint64_t*, uint64_t*) |
| 625 | { |
| 626 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
| 627 | } |
| 628 | |
| 629 | // Print for debugging. |
| 630 | void |
| 631 | print(FILE* f) const |
| 632 | { |
| 633 | fprintf(f, " "); |
| 634 | this->assignment_.print(f); |
| 635 | } |
| 636 | |
| 637 | private: |
| 638 | Symbol_assignment assignment_; |
| 639 | }; |
| 640 | |
| 641 | // An assignment to the dot symbol in a SECTIONS clause outside of an |
| 642 | // output section. |
| 643 | |
| 644 | class Sections_element_dot_assignment : public Sections_element |
| 645 | { |
| 646 | public: |
| 647 | Sections_element_dot_assignment(Expression* val) |
| 648 | : val_(val) |
| 649 | { } |
| 650 | |
| 651 | // Finalize the symbol. |
| 652 | void |
| 653 | finalize_symbols(Symbol_table* symtab, const Layout* layout, |
| 654 | uint64_t* dot_value) |
| 655 | { |
| 656 | // We ignore the section of the result because outside of an |
| 657 | // output section definition the dot symbol is always considered |
| 658 | // to be absolute. |
| 659 | Output_section* dummy; |
| 660 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
| 661 | NULL, &dummy, NULL); |
| 662 | } |
| 663 | |
| 664 | // Update the dot symbol while setting section addresses. |
| 665 | void |
| 666 | set_section_addresses(Symbol_table* symtab, Layout* layout, |
| 667 | uint64_t* dot_value, uint64_t* dot_alignment, |
| 668 | uint64_t* load_address) |
| 669 | { |
| 670 | Output_section* dummy; |
| 671 | *dot_value = this->val_->eval_with_dot(symtab, layout, false, *dot_value, |
| 672 | NULL, &dummy, dot_alignment); |
| 673 | *load_address = *dot_value; |
| 674 | } |
| 675 | |
| 676 | // Print for debugging. |
| 677 | void |
| 678 | print(FILE* f) const |
| 679 | { |
| 680 | fprintf(f, " . = "); |
| 681 | this->val_->print(f); |
| 682 | fprintf(f, "\n"); |
| 683 | } |
| 684 | |
| 685 | private: |
| 686 | Expression* val_; |
| 687 | }; |
| 688 | |
| 689 | // An assertion in a SECTIONS clause outside of an output section. |
| 690 | |
| 691 | class Sections_element_assertion : public Sections_element |
| 692 | { |
| 693 | public: |
| 694 | Sections_element_assertion(Expression* check, const char* message, |
| 695 | size_t messagelen) |
| 696 | : assertion_(check, message, messagelen) |
| 697 | { } |
| 698 | |
| 699 | // Check the assertion. |
| 700 | void |
| 701 | finalize_symbols(Symbol_table* symtab, const Layout* layout, uint64_t*) |
| 702 | { this->assertion_.check(symtab, layout); } |
| 703 | |
| 704 | // Print for debugging. |
| 705 | void |
| 706 | print(FILE* f) const |
| 707 | { |
| 708 | fprintf(f, " "); |
| 709 | this->assertion_.print(f); |
| 710 | } |
| 711 | |
| 712 | private: |
| 713 | Script_assertion assertion_; |
| 714 | }; |
| 715 | |
| 716 | // An element in an output section in a SECTIONS clause. |
| 717 | |
| 718 | class Output_section_element |
| 719 | { |
| 720 | public: |
| 721 | // A list of input sections. |
| 722 | typedef std::list<Output_section::Input_section> Input_section_list; |
| 723 | |
| 724 | Output_section_element() |
| 725 | { } |
| 726 | |
| 727 | virtual ~Output_section_element() |
| 728 | { } |
| 729 | |
| 730 | // Return whether this element requires an output section to exist. |
| 731 | virtual bool |
| 732 | needs_output_section() const |
| 733 | { return false; } |
| 734 | |
| 735 | // Add any symbol being defined to the symbol table. |
| 736 | virtual void |
| 737 | add_symbols_to_table(Symbol_table*) |
| 738 | { } |
| 739 | |
| 740 | // Finalize symbols and check assertions. |
| 741 | virtual void |
| 742 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*, Output_section**) |
| 743 | { } |
| 744 | |
| 745 | // Return whether this element matches FILE_NAME and SECTION_NAME. |
| 746 | // The only real implementation is in Output_section_element_input. |
| 747 | virtual bool |
| 748 | match_name(const char*, const char*) const |
| 749 | { return false; } |
| 750 | |
| 751 | // Set section addresses. This includes applying assignments if the |
| 752 | // the expression is an absolute value. |
| 753 | virtual void |
| 754 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, |
| 755 | uint64_t*, uint64_t*, Output_section**, std::string*, |
| 756 | Input_section_list*) |
| 757 | { } |
| 758 | |
| 759 | // Print the element for debugging purposes. |
| 760 | virtual void |
| 761 | print(FILE* f) const = 0; |
| 762 | |
| 763 | protected: |
| 764 | // Return a fill string that is LENGTH bytes long, filling it with |
| 765 | // FILL. |
| 766 | std::string |
| 767 | get_fill_string(const std::string* fill, section_size_type length) const; |
| 768 | }; |
| 769 | |
| 770 | std::string |
| 771 | Output_section_element::get_fill_string(const std::string* fill, |
| 772 | section_size_type length) const |
| 773 | { |
| 774 | std::string this_fill; |
| 775 | this_fill.reserve(length); |
| 776 | while (this_fill.length() + fill->length() <= length) |
| 777 | this_fill += *fill; |
| 778 | if (this_fill.length() < length) |
| 779 | this_fill.append(*fill, 0, length - this_fill.length()); |
| 780 | return this_fill; |
| 781 | } |
| 782 | |
| 783 | // A symbol assignment in an output section. |
| 784 | |
| 785 | class Output_section_element_assignment : public Output_section_element |
| 786 | { |
| 787 | public: |
| 788 | Output_section_element_assignment(const char* name, size_t namelen, |
| 789 | Expression* val, bool provide, |
| 790 | bool hidden) |
| 791 | : assignment_(name, namelen, false, val, provide, hidden) |
| 792 | { } |
| 793 | |
| 794 | // Add the symbol to the symbol table. |
| 795 | void |
| 796 | add_symbols_to_table(Symbol_table* symtab) |
| 797 | { this->assignment_.add_to_table(symtab); } |
| 798 | |
| 799 | // Finalize the symbol. |
| 800 | void |
| 801 | finalize_symbols(Symbol_table* symtab, const Layout* layout, |
| 802 | uint64_t* dot_value, Output_section** dot_section) |
| 803 | { |
| 804 | this->assignment_.finalize_with_dot(symtab, layout, *dot_value, |
| 805 | *dot_section); |
| 806 | } |
| 807 | |
| 808 | // Set the section address. There is no section here, but if the |
| 809 | // value is absolute, we set the symbol. This permits us to use |
| 810 | // absolute symbols when setting dot. |
| 811 | void |
| 812 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, |
| 813 | uint64_t, uint64_t* dot_value, uint64_t*, |
| 814 | Output_section**, std::string*, Input_section_list*) |
| 815 | { |
| 816 | this->assignment_.set_if_absolute(symtab, layout, true, *dot_value); |
| 817 | } |
| 818 | |
| 819 | // Print for debugging. |
| 820 | void |
| 821 | print(FILE* f) const |
| 822 | { |
| 823 | fprintf(f, " "); |
| 824 | this->assignment_.print(f); |
| 825 | } |
| 826 | |
| 827 | private: |
| 828 | Symbol_assignment assignment_; |
| 829 | }; |
| 830 | |
| 831 | // An assignment to the dot symbol in an output section. |
| 832 | |
| 833 | class Output_section_element_dot_assignment : public Output_section_element |
| 834 | { |
| 835 | public: |
| 836 | Output_section_element_dot_assignment(Expression* val) |
| 837 | : val_(val) |
| 838 | { } |
| 839 | |
| 840 | // Finalize the symbol. |
| 841 | void |
| 842 | finalize_symbols(Symbol_table* symtab, const Layout* layout, |
| 843 | uint64_t* dot_value, Output_section** dot_section) |
| 844 | { |
| 845 | *dot_value = this->val_->eval_with_dot(symtab, layout, true, *dot_value, |
| 846 | *dot_section, dot_section, NULL); |
| 847 | } |
| 848 | |
| 849 | // Update the dot symbol while setting section addresses. |
| 850 | void |
| 851 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, |
| 852 | uint64_t, uint64_t* dot_value, uint64_t*, |
| 853 | Output_section**, std::string*, Input_section_list*); |
| 854 | |
| 855 | // Print for debugging. |
| 856 | void |
| 857 | print(FILE* f) const |
| 858 | { |
| 859 | fprintf(f, " . = "); |
| 860 | this->val_->print(f); |
| 861 | fprintf(f, "\n"); |
| 862 | } |
| 863 | |
| 864 | private: |
| 865 | Expression* val_; |
| 866 | }; |
| 867 | |
| 868 | // Update the dot symbol while setting section addresses. |
| 869 | |
| 870 | void |
| 871 | Output_section_element_dot_assignment::set_section_addresses( |
| 872 | Symbol_table* symtab, |
| 873 | Layout* layout, |
| 874 | Output_section* output_section, |
| 875 | uint64_t, |
| 876 | uint64_t* dot_value, |
| 877 | uint64_t* dot_alignment, |
| 878 | Output_section** dot_section, |
| 879 | std::string* fill, |
| 880 | Input_section_list*) |
| 881 | { |
| 882 | uint64_t next_dot = this->val_->eval_with_dot(symtab, layout, false, |
| 883 | *dot_value, *dot_section, |
| 884 | dot_section, dot_alignment); |
| 885 | if (next_dot < *dot_value) |
| 886 | gold_error(_("dot may not move backward")); |
| 887 | if (next_dot > *dot_value && output_section != NULL) |
| 888 | { |
| 889 | section_size_type length = convert_to_section_size_type(next_dot |
| 890 | - *dot_value); |
| 891 | Output_section_data* posd; |
| 892 | if (fill->empty()) |
| 893 | posd = new Output_data_zero_fill(length, 0); |
| 894 | else |
| 895 | { |
| 896 | std::string this_fill = this->get_fill_string(fill, length); |
| 897 | posd = new Output_data_const(this_fill, 0); |
| 898 | } |
| 899 | output_section->add_output_section_data(posd); |
| 900 | layout->new_output_section_data_from_script(posd); |
| 901 | } |
| 902 | *dot_value = next_dot; |
| 903 | } |
| 904 | |
| 905 | // An assertion in an output section. |
| 906 | |
| 907 | class Output_section_element_assertion : public Output_section_element |
| 908 | { |
| 909 | public: |
| 910 | Output_section_element_assertion(Expression* check, const char* message, |
| 911 | size_t messagelen) |
| 912 | : assertion_(check, message, messagelen) |
| 913 | { } |
| 914 | |
| 915 | void |
| 916 | print(FILE* f) const |
| 917 | { |
| 918 | fprintf(f, " "); |
| 919 | this->assertion_.print(f); |
| 920 | } |
| 921 | |
| 922 | private: |
| 923 | Script_assertion assertion_; |
| 924 | }; |
| 925 | |
| 926 | // We use a special instance of Output_section_data to handle BYTE, |
| 927 | // SHORT, etc. This permits forward references to symbols in the |
| 928 | // expressions. |
| 929 | |
| 930 | class Output_data_expression : public Output_section_data |
| 931 | { |
| 932 | public: |
| 933 | Output_data_expression(int size, bool is_signed, Expression* val, |
| 934 | const Symbol_table* symtab, const Layout* layout, |
| 935 | uint64_t dot_value, Output_section* dot_section) |
| 936 | : Output_section_data(size, 0, true), |
| 937 | is_signed_(is_signed), val_(val), symtab_(symtab), |
| 938 | layout_(layout), dot_value_(dot_value), dot_section_(dot_section) |
| 939 | { } |
| 940 | |
| 941 | protected: |
| 942 | // Write the data to the output file. |
| 943 | void |
| 944 | do_write(Output_file*); |
| 945 | |
| 946 | // Write the data to a buffer. |
| 947 | void |
| 948 | do_write_to_buffer(unsigned char*); |
| 949 | |
| 950 | // Write to a map file. |
| 951 | void |
| 952 | do_print_to_mapfile(Mapfile* mapfile) const |
| 953 | { mapfile->print_output_data(this, _("** expression")); } |
| 954 | |
| 955 | private: |
| 956 | template<bool big_endian> |
| 957 | void |
| 958 | endian_write_to_buffer(uint64_t, unsigned char*); |
| 959 | |
| 960 | bool is_signed_; |
| 961 | Expression* val_; |
| 962 | const Symbol_table* symtab_; |
| 963 | const Layout* layout_; |
| 964 | uint64_t dot_value_; |
| 965 | Output_section* dot_section_; |
| 966 | }; |
| 967 | |
| 968 | // Write the data element to the output file. |
| 969 | |
| 970 | void |
| 971 | Output_data_expression::do_write(Output_file* of) |
| 972 | { |
| 973 | unsigned char* view = of->get_output_view(this->offset(), this->data_size()); |
| 974 | this->write_to_buffer(view); |
| 975 | of->write_output_view(this->offset(), this->data_size(), view); |
| 976 | } |
| 977 | |
| 978 | // Write the data element to a buffer. |
| 979 | |
| 980 | void |
| 981 | Output_data_expression::do_write_to_buffer(unsigned char* buf) |
| 982 | { |
| 983 | Output_section* dummy; |
| 984 | uint64_t val = this->val_->eval_with_dot(this->symtab_, this->layout_, |
| 985 | true, this->dot_value_, |
| 986 | this->dot_section_, &dummy, NULL); |
| 987 | |
| 988 | if (parameters->target().is_big_endian()) |
| 989 | this->endian_write_to_buffer<true>(val, buf); |
| 990 | else |
| 991 | this->endian_write_to_buffer<false>(val, buf); |
| 992 | } |
| 993 | |
| 994 | template<bool big_endian> |
| 995 | void |
| 996 | Output_data_expression::endian_write_to_buffer(uint64_t val, |
| 997 | unsigned char* buf) |
| 998 | { |
| 999 | switch (this->data_size()) |
| 1000 | { |
| 1001 | case 1: |
| 1002 | elfcpp::Swap_unaligned<8, big_endian>::writeval(buf, val); |
| 1003 | break; |
| 1004 | case 2: |
| 1005 | elfcpp::Swap_unaligned<16, big_endian>::writeval(buf, val); |
| 1006 | break; |
| 1007 | case 4: |
| 1008 | elfcpp::Swap_unaligned<32, big_endian>::writeval(buf, val); |
| 1009 | break; |
| 1010 | case 8: |
| 1011 | if (parameters->target().get_size() == 32) |
| 1012 | { |
| 1013 | val &= 0xffffffff; |
| 1014 | if (this->is_signed_ && (val & 0x80000000) != 0) |
| 1015 | val |= 0xffffffff00000000LL; |
| 1016 | } |
| 1017 | elfcpp::Swap_unaligned<64, big_endian>::writeval(buf, val); |
| 1018 | break; |
| 1019 | default: |
| 1020 | gold_unreachable(); |
| 1021 | } |
| 1022 | } |
| 1023 | |
| 1024 | // A data item in an output section. |
| 1025 | |
| 1026 | class Output_section_element_data : public Output_section_element |
| 1027 | { |
| 1028 | public: |
| 1029 | Output_section_element_data(int size, bool is_signed, Expression* val) |
| 1030 | : size_(size), is_signed_(is_signed), val_(val) |
| 1031 | { } |
| 1032 | |
| 1033 | // If there is a data item, then we must create an output section. |
| 1034 | bool |
| 1035 | needs_output_section() const |
| 1036 | { return true; } |
| 1037 | |
| 1038 | // Finalize symbols--we just need to update dot. |
| 1039 | void |
| 1040 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, |
| 1041 | Output_section**) |
| 1042 | { *dot_value += this->size_; } |
| 1043 | |
| 1044 | // Store the value in the section. |
| 1045 | void |
| 1046 | set_section_addresses(Symbol_table*, Layout*, Output_section*, uint64_t, |
| 1047 | uint64_t* dot_value, uint64_t*, Output_section**, |
| 1048 | std::string*, Input_section_list*); |
| 1049 | |
| 1050 | // Print for debugging. |
| 1051 | void |
| 1052 | print(FILE*) const; |
| 1053 | |
| 1054 | private: |
| 1055 | // The size in bytes. |
| 1056 | int size_; |
| 1057 | // Whether the value is signed. |
| 1058 | bool is_signed_; |
| 1059 | // The value. |
| 1060 | Expression* val_; |
| 1061 | }; |
| 1062 | |
| 1063 | // Store the value in the section. |
| 1064 | |
| 1065 | void |
| 1066 | Output_section_element_data::set_section_addresses( |
| 1067 | Symbol_table* symtab, |
| 1068 | Layout* layout, |
| 1069 | Output_section* os, |
| 1070 | uint64_t, |
| 1071 | uint64_t* dot_value, |
| 1072 | uint64_t*, |
| 1073 | Output_section** dot_section, |
| 1074 | std::string*, |
| 1075 | Input_section_list*) |
| 1076 | { |
| 1077 | gold_assert(os != NULL); |
| 1078 | Output_data_expression* expression = |
| 1079 | new Output_data_expression(this->size_, this->is_signed_, this->val_, |
| 1080 | symtab, layout, *dot_value, *dot_section); |
| 1081 | os->add_output_section_data(expression); |
| 1082 | layout->new_output_section_data_from_script(expression); |
| 1083 | *dot_value += this->size_; |
| 1084 | } |
| 1085 | |
| 1086 | // Print for debugging. |
| 1087 | |
| 1088 | void |
| 1089 | Output_section_element_data::print(FILE* f) const |
| 1090 | { |
| 1091 | const char* s; |
| 1092 | switch (this->size_) |
| 1093 | { |
| 1094 | case 1: |
| 1095 | s = "BYTE"; |
| 1096 | break; |
| 1097 | case 2: |
| 1098 | s = "SHORT"; |
| 1099 | break; |
| 1100 | case 4: |
| 1101 | s = "LONG"; |
| 1102 | break; |
| 1103 | case 8: |
| 1104 | if (this->is_signed_) |
| 1105 | s = "SQUAD"; |
| 1106 | else |
| 1107 | s = "QUAD"; |
| 1108 | break; |
| 1109 | default: |
| 1110 | gold_unreachable(); |
| 1111 | } |
| 1112 | fprintf(f, " %s(", s); |
| 1113 | this->val_->print(f); |
| 1114 | fprintf(f, ")\n"); |
| 1115 | } |
| 1116 | |
| 1117 | // A fill value setting in an output section. |
| 1118 | |
| 1119 | class Output_section_element_fill : public Output_section_element |
| 1120 | { |
| 1121 | public: |
| 1122 | Output_section_element_fill(Expression* val) |
| 1123 | : val_(val) |
| 1124 | { } |
| 1125 | |
| 1126 | // Update the fill value while setting section addresses. |
| 1127 | void |
| 1128 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, |
| 1129 | uint64_t, uint64_t* dot_value, uint64_t*, |
| 1130 | Output_section** dot_section, |
| 1131 | std::string* fill, Input_section_list*) |
| 1132 | { |
| 1133 | Output_section* fill_section; |
| 1134 | uint64_t fill_val = this->val_->eval_with_dot(symtab, layout, false, |
| 1135 | *dot_value, *dot_section, |
| 1136 | &fill_section, NULL); |
| 1137 | if (fill_section != NULL) |
| 1138 | gold_warning(_("fill value is not absolute")); |
| 1139 | // FIXME: The GNU linker supports fill values of arbitrary length. |
| 1140 | unsigned char fill_buff[4]; |
| 1141 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); |
| 1142 | fill->assign(reinterpret_cast<char*>(fill_buff), 4); |
| 1143 | } |
| 1144 | |
| 1145 | // Print for debugging. |
| 1146 | void |
| 1147 | print(FILE* f) const |
| 1148 | { |
| 1149 | fprintf(f, " FILL("); |
| 1150 | this->val_->print(f); |
| 1151 | fprintf(f, ")\n"); |
| 1152 | } |
| 1153 | |
| 1154 | private: |
| 1155 | // The new fill value. |
| 1156 | Expression* val_; |
| 1157 | }; |
| 1158 | |
| 1159 | // An input section specification in an output section |
| 1160 | |
| 1161 | class Output_section_element_input : public Output_section_element |
| 1162 | { |
| 1163 | public: |
| 1164 | Output_section_element_input(const Input_section_spec* spec, bool keep); |
| 1165 | |
| 1166 | // Finalize symbols--just update the value of the dot symbol. |
| 1167 | void |
| 1168 | finalize_symbols(Symbol_table*, const Layout*, uint64_t* dot_value, |
| 1169 | Output_section** dot_section) |
| 1170 | { |
| 1171 | *dot_value = this->final_dot_value_; |
| 1172 | *dot_section = this->final_dot_section_; |
| 1173 | } |
| 1174 | |
| 1175 | // See whether we match FILE_NAME and SECTION_NAME as an input |
| 1176 | // section. |
| 1177 | bool |
| 1178 | match_name(const char* file_name, const char* section_name) const; |
| 1179 | |
| 1180 | // Set the section address. |
| 1181 | void |
| 1182 | set_section_addresses(Symbol_table* symtab, Layout* layout, Output_section*, |
| 1183 | uint64_t subalign, uint64_t* dot_value, uint64_t*, |
| 1184 | Output_section**, std::string* fill, |
| 1185 | Input_section_list*); |
| 1186 | |
| 1187 | // Print for debugging. |
| 1188 | void |
| 1189 | print(FILE* f) const; |
| 1190 | |
| 1191 | private: |
| 1192 | // An input section pattern. |
| 1193 | struct Input_section_pattern |
| 1194 | { |
| 1195 | std::string pattern; |
| 1196 | bool pattern_is_wildcard; |
| 1197 | Sort_wildcard sort; |
| 1198 | |
| 1199 | Input_section_pattern(const char* patterna, size_t patternlena, |
| 1200 | Sort_wildcard sorta) |
| 1201 | : pattern(patterna, patternlena), |
| 1202 | pattern_is_wildcard(is_wildcard_string(this->pattern.c_str())), |
| 1203 | sort(sorta) |
| 1204 | { } |
| 1205 | }; |
| 1206 | |
| 1207 | typedef std::vector<Input_section_pattern> Input_section_patterns; |
| 1208 | |
| 1209 | // Filename_exclusions is a pair of filename pattern and a bool |
| 1210 | // indicating whether the filename is a wildcard. |
| 1211 | typedef std::vector<std::pair<std::string, bool> > Filename_exclusions; |
| 1212 | |
| 1213 | // Return whether STRING matches PATTERN, where IS_WILDCARD_PATTERN |
| 1214 | // indicates whether this is a wildcard pattern. |
| 1215 | static inline bool |
| 1216 | match(const char* string, const char* pattern, bool is_wildcard_pattern) |
| 1217 | { |
| 1218 | return (is_wildcard_pattern |
| 1219 | ? fnmatch(pattern, string, 0) == 0 |
| 1220 | : strcmp(string, pattern) == 0); |
| 1221 | } |
| 1222 | |
| 1223 | // See if we match a file name. |
| 1224 | bool |
| 1225 | match_file_name(const char* file_name) const; |
| 1226 | |
| 1227 | // The file name pattern. If this is the empty string, we match all |
| 1228 | // files. |
| 1229 | std::string filename_pattern_; |
| 1230 | // Whether the file name pattern is a wildcard. |
| 1231 | bool filename_is_wildcard_; |
| 1232 | // How the file names should be sorted. This may only be |
| 1233 | // SORT_WILDCARD_NONE or SORT_WILDCARD_BY_NAME. |
| 1234 | Sort_wildcard filename_sort_; |
| 1235 | // The list of file names to exclude. |
| 1236 | Filename_exclusions filename_exclusions_; |
| 1237 | // The list of input section patterns. |
| 1238 | Input_section_patterns input_section_patterns_; |
| 1239 | // Whether to keep this section when garbage collecting. |
| 1240 | bool keep_; |
| 1241 | // The value of dot after including all matching sections. |
| 1242 | uint64_t final_dot_value_; |
| 1243 | // The section where dot is defined after including all matching |
| 1244 | // sections. |
| 1245 | Output_section* final_dot_section_; |
| 1246 | }; |
| 1247 | |
| 1248 | // Construct Output_section_element_input. The parser records strings |
| 1249 | // as pointers into a copy of the script file, which will go away when |
| 1250 | // parsing is complete. We make sure they are in std::string objects. |
| 1251 | |
| 1252 | Output_section_element_input::Output_section_element_input( |
| 1253 | const Input_section_spec* spec, |
| 1254 | bool keep) |
| 1255 | : filename_pattern_(), |
| 1256 | filename_is_wildcard_(false), |
| 1257 | filename_sort_(spec->file.sort), |
| 1258 | filename_exclusions_(), |
| 1259 | input_section_patterns_(), |
| 1260 | keep_(keep), |
| 1261 | final_dot_value_(0), |
| 1262 | final_dot_section_(NULL) |
| 1263 | { |
| 1264 | // The filename pattern "*" is common, and matches all files. Turn |
| 1265 | // it into the empty string. |
| 1266 | if (spec->file.name.length != 1 || spec->file.name.value[0] != '*') |
| 1267 | this->filename_pattern_.assign(spec->file.name.value, |
| 1268 | spec->file.name.length); |
| 1269 | this->filename_is_wildcard_ = is_wildcard_string(this->filename_pattern_.c_str()); |
| 1270 | |
| 1271 | if (spec->input_sections.exclude != NULL) |
| 1272 | { |
| 1273 | for (String_list::const_iterator p = |
| 1274 | spec->input_sections.exclude->begin(); |
| 1275 | p != spec->input_sections.exclude->end(); |
| 1276 | ++p) |
| 1277 | { |
| 1278 | bool is_wildcard = is_wildcard_string((*p).c_str()); |
| 1279 | this->filename_exclusions_.push_back(std::make_pair(*p, |
| 1280 | is_wildcard)); |
| 1281 | } |
| 1282 | } |
| 1283 | |
| 1284 | if (spec->input_sections.sections != NULL) |
| 1285 | { |
| 1286 | Input_section_patterns& isp(this->input_section_patterns_); |
| 1287 | for (String_sort_list::const_iterator p = |
| 1288 | spec->input_sections.sections->begin(); |
| 1289 | p != spec->input_sections.sections->end(); |
| 1290 | ++p) |
| 1291 | isp.push_back(Input_section_pattern(p->name.value, p->name.length, |
| 1292 | p->sort)); |
| 1293 | } |
| 1294 | } |
| 1295 | |
| 1296 | // See whether we match FILE_NAME. |
| 1297 | |
| 1298 | bool |
| 1299 | Output_section_element_input::match_file_name(const char* file_name) const |
| 1300 | { |
| 1301 | if (!this->filename_pattern_.empty()) |
| 1302 | { |
| 1303 | // If we were called with no filename, we refuse to match a |
| 1304 | // pattern which requires a file name. |
| 1305 | if (file_name == NULL) |
| 1306 | return false; |
| 1307 | |
| 1308 | if (!match(file_name, this->filename_pattern_.c_str(), |
| 1309 | this->filename_is_wildcard_)) |
| 1310 | return false; |
| 1311 | } |
| 1312 | |
| 1313 | if (file_name != NULL) |
| 1314 | { |
| 1315 | // Now we have to see whether FILE_NAME matches one of the |
| 1316 | // exclusion patterns, if any. |
| 1317 | for (Filename_exclusions::const_iterator p = |
| 1318 | this->filename_exclusions_.begin(); |
| 1319 | p != this->filename_exclusions_.end(); |
| 1320 | ++p) |
| 1321 | { |
| 1322 | if (match(file_name, p->first.c_str(), p->second)) |
| 1323 | return false; |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | return true; |
| 1328 | } |
| 1329 | |
| 1330 | // See whether we match FILE_NAME and SECTION_NAME. |
| 1331 | |
| 1332 | bool |
| 1333 | Output_section_element_input::match_name(const char* file_name, |
| 1334 | const char* section_name) const |
| 1335 | { |
| 1336 | if (!this->match_file_name(file_name)) |
| 1337 | return false; |
| 1338 | |
| 1339 | // If there are no section name patterns, then we match. |
| 1340 | if (this->input_section_patterns_.empty()) |
| 1341 | return true; |
| 1342 | |
| 1343 | // See whether we match the section name patterns. |
| 1344 | for (Input_section_patterns::const_iterator p = |
| 1345 | this->input_section_patterns_.begin(); |
| 1346 | p != this->input_section_patterns_.end(); |
| 1347 | ++p) |
| 1348 | { |
| 1349 | if (match(section_name, p->pattern.c_str(), p->pattern_is_wildcard)) |
| 1350 | return true; |
| 1351 | } |
| 1352 | |
| 1353 | // We didn't match any section names, so we didn't match. |
| 1354 | return false; |
| 1355 | } |
| 1356 | |
| 1357 | // Information we use to sort the input sections. |
| 1358 | |
| 1359 | class Input_section_info |
| 1360 | { |
| 1361 | public: |
| 1362 | Input_section_info(const Output_section::Input_section& input_section) |
| 1363 | : input_section_(input_section), section_name_(), |
| 1364 | size_(0), addralign_(1) |
| 1365 | { } |
| 1366 | |
| 1367 | // Return the simple input section. |
| 1368 | const Output_section::Input_section& |
| 1369 | input_section() const |
| 1370 | { return this->input_section_; } |
| 1371 | |
| 1372 | // Return the object. |
| 1373 | Relobj* |
| 1374 | relobj() const |
| 1375 | { return this->input_section_.relobj(); } |
| 1376 | |
| 1377 | // Return the section index. |
| 1378 | unsigned int |
| 1379 | shndx() |
| 1380 | { return this->input_section_.shndx(); } |
| 1381 | |
| 1382 | // Return the section name. |
| 1383 | const std::string& |
| 1384 | section_name() const |
| 1385 | { return this->section_name_; } |
| 1386 | |
| 1387 | // Set the section name. |
| 1388 | void |
| 1389 | set_section_name(const std::string name) |
| 1390 | { this->section_name_ = name; } |
| 1391 | |
| 1392 | // Return the section size. |
| 1393 | uint64_t |
| 1394 | size() const |
| 1395 | { return this->size_; } |
| 1396 | |
| 1397 | // Set the section size. |
| 1398 | void |
| 1399 | set_size(uint64_t size) |
| 1400 | { this->size_ = size; } |
| 1401 | |
| 1402 | // Return the address alignment. |
| 1403 | uint64_t |
| 1404 | addralign() const |
| 1405 | { return this->addralign_; } |
| 1406 | |
| 1407 | // Set the address alignment. |
| 1408 | void |
| 1409 | set_addralign(uint64_t addralign) |
| 1410 | { this->addralign_ = addralign; } |
| 1411 | |
| 1412 | private: |
| 1413 | // Input section, can be a relaxed section. |
| 1414 | Output_section::Input_section input_section_; |
| 1415 | // Name of the section. |
| 1416 | std::string section_name_; |
| 1417 | // Section size. |
| 1418 | uint64_t size_; |
| 1419 | // Address alignment. |
| 1420 | uint64_t addralign_; |
| 1421 | }; |
| 1422 | |
| 1423 | // A class to sort the input sections. |
| 1424 | |
| 1425 | class Input_section_sorter |
| 1426 | { |
| 1427 | public: |
| 1428 | Input_section_sorter(Sort_wildcard filename_sort, Sort_wildcard section_sort) |
| 1429 | : filename_sort_(filename_sort), section_sort_(section_sort) |
| 1430 | { } |
| 1431 | |
| 1432 | bool |
| 1433 | operator()(const Input_section_info&, const Input_section_info&) const; |
| 1434 | |
| 1435 | private: |
| 1436 | Sort_wildcard filename_sort_; |
| 1437 | Sort_wildcard section_sort_; |
| 1438 | }; |
| 1439 | |
| 1440 | bool |
| 1441 | Input_section_sorter::operator()(const Input_section_info& isi1, |
| 1442 | const Input_section_info& isi2) const |
| 1443 | { |
| 1444 | if (this->section_sort_ == SORT_WILDCARD_BY_NAME |
| 1445 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT |
| 1446 | || (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME |
| 1447 | && isi1.addralign() == isi2.addralign())) |
| 1448 | { |
| 1449 | if (isi1.section_name() != isi2.section_name()) |
| 1450 | return isi1.section_name() < isi2.section_name(); |
| 1451 | } |
| 1452 | if (this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT |
| 1453 | || this->section_sort_ == SORT_WILDCARD_BY_NAME_BY_ALIGNMENT |
| 1454 | || this->section_sort_ == SORT_WILDCARD_BY_ALIGNMENT_BY_NAME) |
| 1455 | { |
| 1456 | if (isi1.addralign() != isi2.addralign()) |
| 1457 | return isi1.addralign() < isi2.addralign(); |
| 1458 | } |
| 1459 | if (this->filename_sort_ == SORT_WILDCARD_BY_NAME) |
| 1460 | { |
| 1461 | if (isi1.relobj()->name() != isi2.relobj()->name()) |
| 1462 | return (isi1.relobj()->name() < isi2.relobj()->name()); |
| 1463 | } |
| 1464 | |
| 1465 | // Otherwise we leave them in the same order. |
| 1466 | return false; |
| 1467 | } |
| 1468 | |
| 1469 | // Set the section address. Look in INPUT_SECTIONS for sections which |
| 1470 | // match this spec, sort them as specified, and add them to the output |
| 1471 | // section. |
| 1472 | |
| 1473 | void |
| 1474 | Output_section_element_input::set_section_addresses( |
| 1475 | Symbol_table*, |
| 1476 | Layout* layout, |
| 1477 | Output_section* output_section, |
| 1478 | uint64_t subalign, |
| 1479 | uint64_t* dot_value, |
| 1480 | uint64_t*, |
| 1481 | Output_section** dot_section, |
| 1482 | std::string* fill, |
| 1483 | Input_section_list* input_sections) |
| 1484 | { |
| 1485 | // We build a list of sections which match each |
| 1486 | // Input_section_pattern. |
| 1487 | |
| 1488 | typedef std::vector<std::vector<Input_section_info> > Matching_sections; |
| 1489 | size_t input_pattern_count = this->input_section_patterns_.size(); |
| 1490 | if (input_pattern_count == 0) |
| 1491 | input_pattern_count = 1; |
| 1492 | Matching_sections matching_sections(input_pattern_count); |
| 1493 | |
| 1494 | // Look through the list of sections for this output section. Add |
| 1495 | // each one which matches to one of the elements of |
| 1496 | // MATCHING_SECTIONS. |
| 1497 | |
| 1498 | Input_section_list::iterator p = input_sections->begin(); |
| 1499 | while (p != input_sections->end()) |
| 1500 | { |
| 1501 | Relobj* relobj = p->relobj(); |
| 1502 | unsigned int shndx = p->shndx(); |
| 1503 | Input_section_info isi(*p); |
| 1504 | |
| 1505 | // Calling section_name and section_addralign is not very |
| 1506 | // efficient. |
| 1507 | |
| 1508 | // Lock the object so that we can get information about the |
| 1509 | // section. This is OK since we know we are single-threaded |
| 1510 | // here. |
| 1511 | { |
| 1512 | const Task* task = reinterpret_cast<const Task*>(-1); |
| 1513 | Task_lock_obj<Object> tl(task, relobj); |
| 1514 | |
| 1515 | isi.set_section_name(relobj->section_name(shndx)); |
| 1516 | if (p->is_relaxed_input_section()) |
| 1517 | { |
| 1518 | // We use current data size because relxed section sizes may not |
| 1519 | // have finalized yet. |
| 1520 | isi.set_size(p->relaxed_input_section()->current_data_size()); |
| 1521 | isi.set_addralign(p->relaxed_input_section()->addralign()); |
| 1522 | } |
| 1523 | else |
| 1524 | { |
| 1525 | isi.set_size(relobj->section_size(shndx)); |
| 1526 | isi.set_addralign(relobj->section_addralign(shndx)); |
| 1527 | } |
| 1528 | } |
| 1529 | |
| 1530 | if (!this->match_file_name(relobj->name().c_str())) |
| 1531 | ++p; |
| 1532 | else if (this->input_section_patterns_.empty()) |
| 1533 | { |
| 1534 | matching_sections[0].push_back(isi); |
| 1535 | p = input_sections->erase(p); |
| 1536 | } |
| 1537 | else |
| 1538 | { |
| 1539 | size_t i; |
| 1540 | for (i = 0; i < input_pattern_count; ++i) |
| 1541 | { |
| 1542 | const Input_section_pattern& |
| 1543 | isp(this->input_section_patterns_[i]); |
| 1544 | if (match(isi.section_name().c_str(), isp.pattern.c_str(), |
| 1545 | isp.pattern_is_wildcard)) |
| 1546 | break; |
| 1547 | } |
| 1548 | |
| 1549 | if (i >= this->input_section_patterns_.size()) |
| 1550 | ++p; |
| 1551 | else |
| 1552 | { |
| 1553 | matching_sections[i].push_back(isi); |
| 1554 | p = input_sections->erase(p); |
| 1555 | } |
| 1556 | } |
| 1557 | } |
| 1558 | |
| 1559 | // Look through MATCHING_SECTIONS. Sort each one as specified, |
| 1560 | // using a stable sort so that we get the default order when |
| 1561 | // sections are otherwise equal. Add each input section to the |
| 1562 | // output section. |
| 1563 | |
| 1564 | uint64_t dot = *dot_value; |
| 1565 | for (size_t i = 0; i < input_pattern_count; ++i) |
| 1566 | { |
| 1567 | if (matching_sections[i].empty()) |
| 1568 | continue; |
| 1569 | |
| 1570 | gold_assert(output_section != NULL); |
| 1571 | |
| 1572 | const Input_section_pattern& isp(this->input_section_patterns_[i]); |
| 1573 | if (isp.sort != SORT_WILDCARD_NONE |
| 1574 | || this->filename_sort_ != SORT_WILDCARD_NONE) |
| 1575 | std::stable_sort(matching_sections[i].begin(), |
| 1576 | matching_sections[i].end(), |
| 1577 | Input_section_sorter(this->filename_sort_, |
| 1578 | isp.sort)); |
| 1579 | |
| 1580 | for (std::vector<Input_section_info>::const_iterator p = |
| 1581 | matching_sections[i].begin(); |
| 1582 | p != matching_sections[i].end(); |
| 1583 | ++p) |
| 1584 | { |
| 1585 | // Override the original address alignment if SUBALIGN is specified |
| 1586 | // and is greater than the original alignment. We need to make a |
| 1587 | // copy of the input section to modify the alignment. |
| 1588 | Output_section::Input_section sis(p->input_section()); |
| 1589 | |
| 1590 | uint64_t this_subalign = sis.addralign(); |
| 1591 | if (!sis.is_input_section()) |
| 1592 | sis.output_section_data()->finalize_data_size(); |
| 1593 | uint64_t data_size = sis.data_size(); |
| 1594 | if (this_subalign < subalign) |
| 1595 | { |
| 1596 | this_subalign = subalign; |
| 1597 | sis.set_addralign(subalign); |
| 1598 | } |
| 1599 | |
| 1600 | uint64_t address = align_address(dot, this_subalign); |
| 1601 | |
| 1602 | if (address > dot && !fill->empty()) |
| 1603 | { |
| 1604 | section_size_type length = |
| 1605 | convert_to_section_size_type(address - dot); |
| 1606 | std::string this_fill = this->get_fill_string(fill, length); |
| 1607 | Output_section_data* posd = new Output_data_const(this_fill, 0); |
| 1608 | output_section->add_output_section_data(posd); |
| 1609 | layout->new_output_section_data_from_script(posd); |
| 1610 | } |
| 1611 | |
| 1612 | output_section->add_script_input_section(sis); |
| 1613 | dot = address + data_size; |
| 1614 | } |
| 1615 | } |
| 1616 | |
| 1617 | // An SHF_TLS/SHT_NOBITS section does not take up any |
| 1618 | // address space. |
| 1619 | if (output_section == NULL |
| 1620 | || (output_section->flags() & elfcpp::SHF_TLS) == 0 |
| 1621 | || output_section->type() != elfcpp::SHT_NOBITS) |
| 1622 | *dot_value = dot; |
| 1623 | |
| 1624 | this->final_dot_value_ = *dot_value; |
| 1625 | this->final_dot_section_ = *dot_section; |
| 1626 | } |
| 1627 | |
| 1628 | // Print for debugging. |
| 1629 | |
| 1630 | void |
| 1631 | Output_section_element_input::print(FILE* f) const |
| 1632 | { |
| 1633 | fprintf(f, " "); |
| 1634 | |
| 1635 | if (this->keep_) |
| 1636 | fprintf(f, "KEEP("); |
| 1637 | |
| 1638 | if (!this->filename_pattern_.empty()) |
| 1639 | { |
| 1640 | bool need_close_paren = false; |
| 1641 | switch (this->filename_sort_) |
| 1642 | { |
| 1643 | case SORT_WILDCARD_NONE: |
| 1644 | break; |
| 1645 | case SORT_WILDCARD_BY_NAME: |
| 1646 | fprintf(f, "SORT_BY_NAME("); |
| 1647 | need_close_paren = true; |
| 1648 | break; |
| 1649 | default: |
| 1650 | gold_unreachable(); |
| 1651 | } |
| 1652 | |
| 1653 | fprintf(f, "%s", this->filename_pattern_.c_str()); |
| 1654 | |
| 1655 | if (need_close_paren) |
| 1656 | fprintf(f, ")"); |
| 1657 | } |
| 1658 | |
| 1659 | if (!this->input_section_patterns_.empty() |
| 1660 | || !this->filename_exclusions_.empty()) |
| 1661 | { |
| 1662 | fprintf(f, "("); |
| 1663 | |
| 1664 | bool need_space = false; |
| 1665 | if (!this->filename_exclusions_.empty()) |
| 1666 | { |
| 1667 | fprintf(f, "EXCLUDE_FILE("); |
| 1668 | bool need_comma = false; |
| 1669 | for (Filename_exclusions::const_iterator p = |
| 1670 | this->filename_exclusions_.begin(); |
| 1671 | p != this->filename_exclusions_.end(); |
| 1672 | ++p) |
| 1673 | { |
| 1674 | if (need_comma) |
| 1675 | fprintf(f, ", "); |
| 1676 | fprintf(f, "%s", p->first.c_str()); |
| 1677 | need_comma = true; |
| 1678 | } |
| 1679 | fprintf(f, ")"); |
| 1680 | need_space = true; |
| 1681 | } |
| 1682 | |
| 1683 | for (Input_section_patterns::const_iterator p = |
| 1684 | this->input_section_patterns_.begin(); |
| 1685 | p != this->input_section_patterns_.end(); |
| 1686 | ++p) |
| 1687 | { |
| 1688 | if (need_space) |
| 1689 | fprintf(f, " "); |
| 1690 | |
| 1691 | int close_parens = 0; |
| 1692 | switch (p->sort) |
| 1693 | { |
| 1694 | case SORT_WILDCARD_NONE: |
| 1695 | break; |
| 1696 | case SORT_WILDCARD_BY_NAME: |
| 1697 | fprintf(f, "SORT_BY_NAME("); |
| 1698 | close_parens = 1; |
| 1699 | break; |
| 1700 | case SORT_WILDCARD_BY_ALIGNMENT: |
| 1701 | fprintf(f, "SORT_BY_ALIGNMENT("); |
| 1702 | close_parens = 1; |
| 1703 | break; |
| 1704 | case SORT_WILDCARD_BY_NAME_BY_ALIGNMENT: |
| 1705 | fprintf(f, "SORT_BY_NAME(SORT_BY_ALIGNMENT("); |
| 1706 | close_parens = 2; |
| 1707 | break; |
| 1708 | case SORT_WILDCARD_BY_ALIGNMENT_BY_NAME: |
| 1709 | fprintf(f, "SORT_BY_ALIGNMENT(SORT_BY_NAME("); |
| 1710 | close_parens = 2; |
| 1711 | break; |
| 1712 | default: |
| 1713 | gold_unreachable(); |
| 1714 | } |
| 1715 | |
| 1716 | fprintf(f, "%s", p->pattern.c_str()); |
| 1717 | |
| 1718 | for (int i = 0; i < close_parens; ++i) |
| 1719 | fprintf(f, ")"); |
| 1720 | |
| 1721 | need_space = true; |
| 1722 | } |
| 1723 | |
| 1724 | fprintf(f, ")"); |
| 1725 | } |
| 1726 | |
| 1727 | if (this->keep_) |
| 1728 | fprintf(f, ")"); |
| 1729 | |
| 1730 | fprintf(f, "\n"); |
| 1731 | } |
| 1732 | |
| 1733 | // An output section. |
| 1734 | |
| 1735 | class Output_section_definition : public Sections_element |
| 1736 | { |
| 1737 | public: |
| 1738 | typedef Output_section_element::Input_section_list Input_section_list; |
| 1739 | |
| 1740 | Output_section_definition(const char* name, size_t namelen, |
| 1741 | const Parser_output_section_header* header); |
| 1742 | |
| 1743 | // Finish the output section with the information in the trailer. |
| 1744 | void |
| 1745 | finish(const Parser_output_section_trailer* trailer); |
| 1746 | |
| 1747 | // Add a symbol to be defined. |
| 1748 | void |
| 1749 | add_symbol_assignment(const char* name, size_t length, Expression* value, |
| 1750 | bool provide, bool hidden); |
| 1751 | |
| 1752 | // Add an assignment to the special dot symbol. |
| 1753 | void |
| 1754 | add_dot_assignment(Expression* value); |
| 1755 | |
| 1756 | // Add an assertion. |
| 1757 | void |
| 1758 | add_assertion(Expression* check, const char* message, size_t messagelen); |
| 1759 | |
| 1760 | // Add a data item to the current output section. |
| 1761 | void |
| 1762 | add_data(int size, bool is_signed, Expression* val); |
| 1763 | |
| 1764 | // Add a setting for the fill value. |
| 1765 | void |
| 1766 | add_fill(Expression* val); |
| 1767 | |
| 1768 | // Add an input section specification. |
| 1769 | void |
| 1770 | add_input_section(const Input_section_spec* spec, bool keep); |
| 1771 | |
| 1772 | // Return whether the output section is relro. |
| 1773 | bool |
| 1774 | is_relro() const |
| 1775 | { return this->is_relro_; } |
| 1776 | |
| 1777 | // Record that the output section is relro. |
| 1778 | void |
| 1779 | set_is_relro() |
| 1780 | { this->is_relro_ = true; } |
| 1781 | |
| 1782 | // Create any required output sections. |
| 1783 | void |
| 1784 | create_sections(Layout*); |
| 1785 | |
| 1786 | // Add any symbols being defined to the symbol table. |
| 1787 | void |
| 1788 | add_symbols_to_table(Symbol_table* symtab); |
| 1789 | |
| 1790 | // Finalize symbols and check assertions. |
| 1791 | void |
| 1792 | finalize_symbols(Symbol_table*, const Layout*, uint64_t*); |
| 1793 | |
| 1794 | // Return the output section name to use for an input file name and |
| 1795 | // section name. |
| 1796 | const char* |
| 1797 | output_section_name(const char* file_name, const char* section_name, |
| 1798 | Output_section***, Script_sections::Section_type*); |
| 1799 | |
| 1800 | // Initialize OSP with an output section. |
| 1801 | void |
| 1802 | orphan_section_init(Orphan_section_placement* osp, |
| 1803 | Script_sections::Elements_iterator p) |
| 1804 | { osp->output_section_init(this->name_, this->output_section_, p); } |
| 1805 | |
| 1806 | // Set the section address. |
| 1807 | void |
| 1808 | set_section_addresses(Symbol_table* symtab, Layout* layout, |
| 1809 | uint64_t* dot_value, uint64_t*, |
| 1810 | uint64_t* load_address); |
| 1811 | |
| 1812 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
| 1813 | // this section is constrained, and the input sections do not match, |
| 1814 | // return the constraint, and set *POSD. |
| 1815 | Section_constraint |
| 1816 | check_constraint(Output_section_definition** posd); |
| 1817 | |
| 1818 | // See if this is the alternate output section for a constrained |
| 1819 | // output section. If it is, transfer the Output_section and return |
| 1820 | // true. Otherwise return false. |
| 1821 | bool |
| 1822 | alternate_constraint(Output_section_definition*, Section_constraint); |
| 1823 | |
| 1824 | // Get the list of segments to use for an allocated section when |
| 1825 | // using a PHDRS clause. |
| 1826 | Output_section* |
| 1827 | allocate_to_segment(String_list** phdrs_list, bool* orphan); |
| 1828 | |
| 1829 | // Look for an output section by name and return the address, the |
| 1830 | // load address, the alignment, and the size. This is used when an |
| 1831 | // expression refers to an output section which was not actually |
| 1832 | // created. This returns true if the section was found, false |
| 1833 | // otherwise. |
| 1834 | bool |
| 1835 | get_output_section_info(const char*, uint64_t*, uint64_t*, uint64_t*, |
| 1836 | uint64_t*) const; |
| 1837 | |
| 1838 | // Return the associated Output_section if there is one. |
| 1839 | Output_section* |
| 1840 | get_output_section() const |
| 1841 | { return this->output_section_; } |
| 1842 | |
| 1843 | // Print the contents to the FILE. This is for debugging. |
| 1844 | void |
| 1845 | print(FILE*) const; |
| 1846 | |
| 1847 | // Return the output section type if specified or Script_sections::ST_NONE. |
| 1848 | Script_sections::Section_type |
| 1849 | section_type() const; |
| 1850 | |
| 1851 | // Store the memory region to use. |
| 1852 | void |
| 1853 | set_memory_region(Memory_region*, bool set_vma); |
| 1854 | |
| 1855 | void |
| 1856 | set_section_vma(Expression* address) |
| 1857 | { this->address_ = address; } |
| 1858 | |
| 1859 | void |
| 1860 | set_section_lma(Expression* address) |
| 1861 | { this->load_address_ = address; } |
| 1862 | |
| 1863 | std::string |
| 1864 | get_section_name(void) const |
| 1865 | { return this->name_; } |
| 1866 | |
| 1867 | private: |
| 1868 | static const char* |
| 1869 | script_section_type_name(Script_section_type); |
| 1870 | |
| 1871 | typedef std::vector<Output_section_element*> Output_section_elements; |
| 1872 | |
| 1873 | // The output section name. |
| 1874 | std::string name_; |
| 1875 | // The address. This may be NULL. |
| 1876 | Expression* address_; |
| 1877 | // The load address. This may be NULL. |
| 1878 | Expression* load_address_; |
| 1879 | // The alignment. This may be NULL. |
| 1880 | Expression* align_; |
| 1881 | // The input section alignment. This may be NULL. |
| 1882 | Expression* subalign_; |
| 1883 | // The constraint, if any. |
| 1884 | Section_constraint constraint_; |
| 1885 | // The fill value. This may be NULL. |
| 1886 | Expression* fill_; |
| 1887 | // The list of segments this section should go into. This may be |
| 1888 | // NULL. |
| 1889 | String_list* phdrs_; |
| 1890 | // The list of elements defining the section. |
| 1891 | Output_section_elements elements_; |
| 1892 | // The Output_section created for this definition. This will be |
| 1893 | // NULL if none was created. |
| 1894 | Output_section* output_section_; |
| 1895 | // The address after it has been evaluated. |
| 1896 | uint64_t evaluated_address_; |
| 1897 | // The load address after it has been evaluated. |
| 1898 | uint64_t evaluated_load_address_; |
| 1899 | // The alignment after it has been evaluated. |
| 1900 | uint64_t evaluated_addralign_; |
| 1901 | // The output section is relro. |
| 1902 | bool is_relro_; |
| 1903 | // The output section type if specified. |
| 1904 | enum Script_section_type script_section_type_; |
| 1905 | }; |
| 1906 | |
| 1907 | // Constructor. |
| 1908 | |
| 1909 | Output_section_definition::Output_section_definition( |
| 1910 | const char* name, |
| 1911 | size_t namelen, |
| 1912 | const Parser_output_section_header* header) |
| 1913 | : name_(name, namelen), |
| 1914 | address_(header->address), |
| 1915 | load_address_(header->load_address), |
| 1916 | align_(header->align), |
| 1917 | subalign_(header->subalign), |
| 1918 | constraint_(header->constraint), |
| 1919 | fill_(NULL), |
| 1920 | phdrs_(NULL), |
| 1921 | elements_(), |
| 1922 | output_section_(NULL), |
| 1923 | evaluated_address_(0), |
| 1924 | evaluated_load_address_(0), |
| 1925 | evaluated_addralign_(0), |
| 1926 | is_relro_(false), |
| 1927 | script_section_type_(header->section_type) |
| 1928 | { |
| 1929 | } |
| 1930 | |
| 1931 | // Finish an output section. |
| 1932 | |
| 1933 | void |
| 1934 | Output_section_definition::finish(const Parser_output_section_trailer* trailer) |
| 1935 | { |
| 1936 | this->fill_ = trailer->fill; |
| 1937 | this->phdrs_ = trailer->phdrs; |
| 1938 | } |
| 1939 | |
| 1940 | // Add a symbol to be defined. |
| 1941 | |
| 1942 | void |
| 1943 | Output_section_definition::add_symbol_assignment(const char* name, |
| 1944 | size_t length, |
| 1945 | Expression* value, |
| 1946 | bool provide, |
| 1947 | bool hidden) |
| 1948 | { |
| 1949 | Output_section_element* p = new Output_section_element_assignment(name, |
| 1950 | length, |
| 1951 | value, |
| 1952 | provide, |
| 1953 | hidden); |
| 1954 | this->elements_.push_back(p); |
| 1955 | } |
| 1956 | |
| 1957 | // Add an assignment to the special dot symbol. |
| 1958 | |
| 1959 | void |
| 1960 | Output_section_definition::add_dot_assignment(Expression* value) |
| 1961 | { |
| 1962 | Output_section_element* p = new Output_section_element_dot_assignment(value); |
| 1963 | this->elements_.push_back(p); |
| 1964 | } |
| 1965 | |
| 1966 | // Add an assertion. |
| 1967 | |
| 1968 | void |
| 1969 | Output_section_definition::add_assertion(Expression* check, |
| 1970 | const char* message, |
| 1971 | size_t messagelen) |
| 1972 | { |
| 1973 | Output_section_element* p = new Output_section_element_assertion(check, |
| 1974 | message, |
| 1975 | messagelen); |
| 1976 | this->elements_.push_back(p); |
| 1977 | } |
| 1978 | |
| 1979 | // Add a data item to the current output section. |
| 1980 | |
| 1981 | void |
| 1982 | Output_section_definition::add_data(int size, bool is_signed, Expression* val) |
| 1983 | { |
| 1984 | Output_section_element* p = new Output_section_element_data(size, is_signed, |
| 1985 | val); |
| 1986 | this->elements_.push_back(p); |
| 1987 | } |
| 1988 | |
| 1989 | // Add a setting for the fill value. |
| 1990 | |
| 1991 | void |
| 1992 | Output_section_definition::add_fill(Expression* val) |
| 1993 | { |
| 1994 | Output_section_element* p = new Output_section_element_fill(val); |
| 1995 | this->elements_.push_back(p); |
| 1996 | } |
| 1997 | |
| 1998 | // Add an input section specification. |
| 1999 | |
| 2000 | void |
| 2001 | Output_section_definition::add_input_section(const Input_section_spec* spec, |
| 2002 | bool keep) |
| 2003 | { |
| 2004 | Output_section_element* p = new Output_section_element_input(spec, keep); |
| 2005 | this->elements_.push_back(p); |
| 2006 | } |
| 2007 | |
| 2008 | // Create any required output sections. We need an output section if |
| 2009 | // there is a data statement here. |
| 2010 | |
| 2011 | void |
| 2012 | Output_section_definition::create_sections(Layout* layout) |
| 2013 | { |
| 2014 | if (this->output_section_ != NULL) |
| 2015 | return; |
| 2016 | for (Output_section_elements::const_iterator p = this->elements_.begin(); |
| 2017 | p != this->elements_.end(); |
| 2018 | ++p) |
| 2019 | { |
| 2020 | if ((*p)->needs_output_section()) |
| 2021 | { |
| 2022 | const char* name = this->name_.c_str(); |
| 2023 | this->output_section_ = |
| 2024 | layout->make_output_section_for_script(name, this->section_type()); |
| 2025 | return; |
| 2026 | } |
| 2027 | } |
| 2028 | } |
| 2029 | |
| 2030 | // Add any symbols being defined to the symbol table. |
| 2031 | |
| 2032 | void |
| 2033 | Output_section_definition::add_symbols_to_table(Symbol_table* symtab) |
| 2034 | { |
| 2035 | for (Output_section_elements::iterator p = this->elements_.begin(); |
| 2036 | p != this->elements_.end(); |
| 2037 | ++p) |
| 2038 | (*p)->add_symbols_to_table(symtab); |
| 2039 | } |
| 2040 | |
| 2041 | // Finalize symbols and check assertions. |
| 2042 | |
| 2043 | void |
| 2044 | Output_section_definition::finalize_symbols(Symbol_table* symtab, |
| 2045 | const Layout* layout, |
| 2046 | uint64_t* dot_value) |
| 2047 | { |
| 2048 | if (this->output_section_ != NULL) |
| 2049 | *dot_value = this->output_section_->address(); |
| 2050 | else |
| 2051 | { |
| 2052 | uint64_t address = *dot_value; |
| 2053 | if (this->address_ != NULL) |
| 2054 | { |
| 2055 | Output_section* dummy; |
| 2056 | address = this->address_->eval_with_dot(symtab, layout, true, |
| 2057 | *dot_value, NULL, |
| 2058 | &dummy, NULL); |
| 2059 | } |
| 2060 | if (this->align_ != NULL) |
| 2061 | { |
| 2062 | Output_section* dummy; |
| 2063 | uint64_t align = this->align_->eval_with_dot(symtab, layout, true, |
| 2064 | *dot_value, |
| 2065 | NULL, |
| 2066 | &dummy, NULL); |
| 2067 | address = align_address(address, align); |
| 2068 | } |
| 2069 | *dot_value = address; |
| 2070 | } |
| 2071 | |
| 2072 | Output_section* dot_section = this->output_section_; |
| 2073 | for (Output_section_elements::iterator p = this->elements_.begin(); |
| 2074 | p != this->elements_.end(); |
| 2075 | ++p) |
| 2076 | (*p)->finalize_symbols(symtab, layout, dot_value, &dot_section); |
| 2077 | } |
| 2078 | |
| 2079 | // Return the output section name to use for an input section name. |
| 2080 | |
| 2081 | const char* |
| 2082 | Output_section_definition::output_section_name( |
| 2083 | const char* file_name, |
| 2084 | const char* section_name, |
| 2085 | Output_section*** slot, |
| 2086 | Script_sections::Section_type* psection_type) |
| 2087 | { |
| 2088 | // Ask each element whether it matches NAME. |
| 2089 | for (Output_section_elements::const_iterator p = this->elements_.begin(); |
| 2090 | p != this->elements_.end(); |
| 2091 | ++p) |
| 2092 | { |
| 2093 | if ((*p)->match_name(file_name, section_name)) |
| 2094 | { |
| 2095 | // We found a match for NAME, which means that it should go |
| 2096 | // into this output section. |
| 2097 | *slot = &this->output_section_; |
| 2098 | *psection_type = this->section_type(); |
| 2099 | return this->name_.c_str(); |
| 2100 | } |
| 2101 | } |
| 2102 | |
| 2103 | // We don't know about this section name. |
| 2104 | return NULL; |
| 2105 | } |
| 2106 | |
| 2107 | // Set the section address. Note that the OUTPUT_SECTION_ field will |
| 2108 | // be NULL if no input sections were mapped to this output section. |
| 2109 | // We still have to adjust dot and process symbol assignments. |
| 2110 | |
| 2111 | void |
| 2112 | Output_section_definition::set_section_addresses(Symbol_table* symtab, |
| 2113 | Layout* layout, |
| 2114 | uint64_t* dot_value, |
| 2115 | uint64_t* dot_alignment, |
| 2116 | uint64_t* load_address) |
| 2117 | { |
| 2118 | uint64_t address; |
| 2119 | uint64_t old_dot_value = *dot_value; |
| 2120 | uint64_t old_load_address = *load_address; |
| 2121 | |
| 2122 | // Check for --section-start. |
| 2123 | bool is_address_set = false; |
| 2124 | if (this->output_section_ != NULL) |
| 2125 | is_address_set = |
| 2126 | parameters->options().section_start(this->output_section_->name(), |
| 2127 | &address); |
| 2128 | if (!is_address_set) |
| 2129 | { |
| 2130 | if (this->address_ == NULL) |
| 2131 | address = *dot_value; |
| 2132 | else |
| 2133 | { |
| 2134 | Output_section* dummy; |
| 2135 | address = this->address_->eval_with_dot(symtab, layout, true, |
| 2136 | *dot_value, NULL, &dummy, |
| 2137 | dot_alignment); |
| 2138 | } |
| 2139 | } |
| 2140 | |
| 2141 | uint64_t align; |
| 2142 | if (this->align_ == NULL) |
| 2143 | { |
| 2144 | if (this->output_section_ == NULL) |
| 2145 | align = 0; |
| 2146 | else |
| 2147 | align = this->output_section_->addralign(); |
| 2148 | } |
| 2149 | else |
| 2150 | { |
| 2151 | Output_section* align_section; |
| 2152 | align = this->align_->eval_with_dot(symtab, layout, true, *dot_value, |
| 2153 | NULL, &align_section, NULL); |
| 2154 | if (align_section != NULL) |
| 2155 | gold_warning(_("alignment of section %s is not absolute"), |
| 2156 | this->name_.c_str()); |
| 2157 | if (this->output_section_ != NULL) |
| 2158 | this->output_section_->set_addralign(align); |
| 2159 | } |
| 2160 | |
| 2161 | address = align_address(address, align); |
| 2162 | |
| 2163 | uint64_t start_address = address; |
| 2164 | |
| 2165 | *dot_value = address; |
| 2166 | |
| 2167 | // Except for NOLOAD sections, the address of non-SHF_ALLOC sections is |
| 2168 | // forced to zero, regardless of what the linker script wants. |
| 2169 | if (this->output_section_ != NULL |
| 2170 | && ((this->output_section_->flags() & elfcpp::SHF_ALLOC) != 0 |
| 2171 | || this->output_section_->is_noload())) |
| 2172 | this->output_section_->set_address(address); |
| 2173 | |
| 2174 | this->evaluated_address_ = address; |
| 2175 | this->evaluated_addralign_ = align; |
| 2176 | |
| 2177 | if (this->load_address_ == NULL) |
| 2178 | this->evaluated_load_address_ = address; |
| 2179 | else |
| 2180 | { |
| 2181 | Output_section* dummy; |
| 2182 | uint64_t laddr = |
| 2183 | this->load_address_->eval_with_dot(symtab, layout, true, *dot_value, |
| 2184 | this->output_section_, &dummy, |
| 2185 | NULL); |
| 2186 | if (this->output_section_ != NULL) |
| 2187 | this->output_section_->set_load_address(laddr); |
| 2188 | this->evaluated_load_address_ = laddr; |
| 2189 | } |
| 2190 | |
| 2191 | uint64_t subalign; |
| 2192 | if (this->subalign_ == NULL) |
| 2193 | subalign = 0; |
| 2194 | else |
| 2195 | { |
| 2196 | Output_section* subalign_section; |
| 2197 | subalign = this->subalign_->eval_with_dot(symtab, layout, true, |
| 2198 | *dot_value, NULL, |
| 2199 | &subalign_section, NULL); |
| 2200 | if (subalign_section != NULL) |
| 2201 | gold_warning(_("subalign of section %s is not absolute"), |
| 2202 | this->name_.c_str()); |
| 2203 | } |
| 2204 | |
| 2205 | std::string fill; |
| 2206 | if (this->fill_ != NULL) |
| 2207 | { |
| 2208 | // FIXME: The GNU linker supports fill values of arbitrary |
| 2209 | // length. |
| 2210 | Output_section* fill_section; |
| 2211 | uint64_t fill_val = this->fill_->eval_with_dot(symtab, layout, true, |
| 2212 | *dot_value, |
| 2213 | NULL, &fill_section, |
| 2214 | NULL); |
| 2215 | if (fill_section != NULL) |
| 2216 | gold_warning(_("fill of section %s is not absolute"), |
| 2217 | this->name_.c_str()); |
| 2218 | unsigned char fill_buff[4]; |
| 2219 | elfcpp::Swap_unaligned<32, true>::writeval(fill_buff, fill_val); |
| 2220 | fill.assign(reinterpret_cast<char*>(fill_buff), 4); |
| 2221 | } |
| 2222 | |
| 2223 | Input_section_list input_sections; |
| 2224 | if (this->output_section_ != NULL) |
| 2225 | { |
| 2226 | // Get the list of input sections attached to this output |
| 2227 | // section. This will leave the output section with only |
| 2228 | // Output_section_data entries. |
| 2229 | address += this->output_section_->get_input_sections(address, |
| 2230 | fill, |
| 2231 | &input_sections); |
| 2232 | *dot_value = address; |
| 2233 | } |
| 2234 | |
| 2235 | Output_section* dot_section = this->output_section_; |
| 2236 | for (Output_section_elements::iterator p = this->elements_.begin(); |
| 2237 | p != this->elements_.end(); |
| 2238 | ++p) |
| 2239 | (*p)->set_section_addresses(symtab, layout, this->output_section_, |
| 2240 | subalign, dot_value, dot_alignment, |
| 2241 | &dot_section, &fill, &input_sections); |
| 2242 | |
| 2243 | gold_assert(input_sections.empty()); |
| 2244 | |
| 2245 | if (this->load_address_ == NULL || this->output_section_ == NULL) |
| 2246 | *load_address = *dot_value; |
| 2247 | else |
| 2248 | *load_address = (this->output_section_->load_address() |
| 2249 | + (*dot_value - start_address)); |
| 2250 | |
| 2251 | if (this->output_section_ != NULL) |
| 2252 | { |
| 2253 | if (this->is_relro_) |
| 2254 | this->output_section_->set_is_relro(); |
| 2255 | else |
| 2256 | this->output_section_->clear_is_relro(); |
| 2257 | |
| 2258 | // If this is a NOLOAD section, keep dot and load address unchanged. |
| 2259 | if (this->output_section_->is_noload()) |
| 2260 | { |
| 2261 | *dot_value = old_dot_value; |
| 2262 | *load_address = old_load_address; |
| 2263 | } |
| 2264 | } |
| 2265 | } |
| 2266 | |
| 2267 | // Check a constraint (ONLY_IF_RO, etc.) on an output section. If |
| 2268 | // this section is constrained, and the input sections do not match, |
| 2269 | // return the constraint, and set *POSD. |
| 2270 | |
| 2271 | Section_constraint |
| 2272 | Output_section_definition::check_constraint(Output_section_definition** posd) |
| 2273 | { |
| 2274 | switch (this->constraint_) |
| 2275 | { |
| 2276 | case CONSTRAINT_NONE: |
| 2277 | return CONSTRAINT_NONE; |
| 2278 | |
| 2279 | case CONSTRAINT_ONLY_IF_RO: |
| 2280 | if (this->output_section_ != NULL |
| 2281 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) != 0) |
| 2282 | { |
| 2283 | *posd = this; |
| 2284 | return CONSTRAINT_ONLY_IF_RO; |
| 2285 | } |
| 2286 | return CONSTRAINT_NONE; |
| 2287 | |
| 2288 | case CONSTRAINT_ONLY_IF_RW: |
| 2289 | if (this->output_section_ != NULL |
| 2290 | && (this->output_section_->flags() & elfcpp::SHF_WRITE) == 0) |
| 2291 | { |
| 2292 | *posd = this; |
| 2293 | return CONSTRAINT_ONLY_IF_RW; |
| 2294 | } |
| 2295 | return CONSTRAINT_NONE; |
| 2296 | |
| 2297 | case CONSTRAINT_SPECIAL: |
| 2298 | if (this->output_section_ != NULL) |
| 2299 | gold_error(_("SPECIAL constraints are not implemented")); |
| 2300 | return CONSTRAINT_NONE; |
| 2301 | |
| 2302 | default: |
| 2303 | gold_unreachable(); |
| 2304 | } |
| 2305 | } |
| 2306 | |
| 2307 | // See if this is the alternate output section for a constrained |
| 2308 | // output section. If it is, transfer the Output_section and return |
| 2309 | // true. Otherwise return false. |
| 2310 | |
| 2311 | bool |
| 2312 | Output_section_definition::alternate_constraint( |
| 2313 | Output_section_definition* posd, |
| 2314 | Section_constraint constraint) |
| 2315 | { |
| 2316 | if (this->name_ != posd->name_) |
| 2317 | return false; |
| 2318 | |
| 2319 | switch (constraint) |
| 2320 | { |
| 2321 | case CONSTRAINT_ONLY_IF_RO: |
| 2322 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RW) |
| 2323 | return false; |
| 2324 | break; |
| 2325 | |
| 2326 | case CONSTRAINT_ONLY_IF_RW: |
| 2327 | if (this->constraint_ != CONSTRAINT_ONLY_IF_RO) |
| 2328 | return false; |
| 2329 | break; |
| 2330 | |
| 2331 | default: |
| 2332 | gold_unreachable(); |
| 2333 | } |
| 2334 | |
| 2335 | // We have found the alternate constraint. We just need to move |
| 2336 | // over the Output_section. When constraints are used properly, |
| 2337 | // THIS should not have an output_section pointer, as all the input |
| 2338 | // sections should have matched the other definition. |
| 2339 | |
| 2340 | if (this->output_section_ != NULL) |
| 2341 | gold_error(_("mismatched definition for constrained sections")); |
| 2342 | |
| 2343 | this->output_section_ = posd->output_section_; |
| 2344 | posd->output_section_ = NULL; |
| 2345 | |
| 2346 | if (this->is_relro_) |
| 2347 | this->output_section_->set_is_relro(); |
| 2348 | else |
| 2349 | this->output_section_->clear_is_relro(); |
| 2350 | |
| 2351 | return true; |
| 2352 | } |
| 2353 | |
| 2354 | // Get the list of segments to use for an allocated section when using |
| 2355 | // a PHDRS clause. |
| 2356 | |
| 2357 | Output_section* |
| 2358 | Output_section_definition::allocate_to_segment(String_list** phdrs_list, |
| 2359 | bool* orphan) |
| 2360 | { |
| 2361 | // Update phdrs_list even if we don't have an output section. It |
| 2362 | // might be used by the following sections. |
| 2363 | if (this->phdrs_ != NULL) |
| 2364 | *phdrs_list = this->phdrs_; |
| 2365 | |
| 2366 | if (this->output_section_ == NULL) |
| 2367 | return NULL; |
| 2368 | if ((this->output_section_->flags() & elfcpp::SHF_ALLOC) == 0) |
| 2369 | return NULL; |
| 2370 | *orphan = false; |
| 2371 | return this->output_section_; |
| 2372 | } |
| 2373 | |
| 2374 | // Look for an output section by name and return the address, the load |
| 2375 | // address, the alignment, and the size. This is used when an |
| 2376 | // expression refers to an output section which was not actually |
| 2377 | // created. This returns true if the section was found, false |
| 2378 | // otherwise. |
| 2379 | |
| 2380 | bool |
| 2381 | Output_section_definition::get_output_section_info(const char* name, |
| 2382 | uint64_t* address, |
| 2383 | uint64_t* load_address, |
| 2384 | uint64_t* addralign, |
| 2385 | uint64_t* size) const |
| 2386 | { |
| 2387 | if (this->name_ != name) |
| 2388 | return false; |
| 2389 | |
| 2390 | if (this->output_section_ != NULL) |
| 2391 | { |
| 2392 | *address = this->output_section_->address(); |
| 2393 | if (this->output_section_->has_load_address()) |
| 2394 | *load_address = this->output_section_->load_address(); |
| 2395 | else |
| 2396 | *load_address = *address; |
| 2397 | *addralign = this->output_section_->addralign(); |
| 2398 | *size = this->output_section_->current_data_size(); |
| 2399 | } |
| 2400 | else |
| 2401 | { |
| 2402 | *address = this->evaluated_address_; |
| 2403 | *load_address = this->evaluated_load_address_; |
| 2404 | *addralign = this->evaluated_addralign_; |
| 2405 | *size = 0; |
| 2406 | } |
| 2407 | |
| 2408 | return true; |
| 2409 | } |
| 2410 | |
| 2411 | // Print for debugging. |
| 2412 | |
| 2413 | void |
| 2414 | Output_section_definition::print(FILE* f) const |
| 2415 | { |
| 2416 | fprintf(f, " %s ", this->name_.c_str()); |
| 2417 | |
| 2418 | if (this->address_ != NULL) |
| 2419 | { |
| 2420 | this->address_->print(f); |
| 2421 | fprintf(f, " "); |
| 2422 | } |
| 2423 | |
| 2424 | if (this->script_section_type_ != SCRIPT_SECTION_TYPE_NONE) |
| 2425 | fprintf(f, "(%s) ", |
| 2426 | this->script_section_type_name(this->script_section_type_)); |
| 2427 | |
| 2428 | fprintf(f, ": "); |
| 2429 | |
| 2430 | if (this->load_address_ != NULL) |
| 2431 | { |
| 2432 | fprintf(f, "AT("); |
| 2433 | this->load_address_->print(f); |
| 2434 | fprintf(f, ") "); |
| 2435 | } |
| 2436 | |
| 2437 | if (this->align_ != NULL) |
| 2438 | { |
| 2439 | fprintf(f, "ALIGN("); |
| 2440 | this->align_->print(f); |
| 2441 | fprintf(f, ") "); |
| 2442 | } |
| 2443 | |
| 2444 | if (this->subalign_ != NULL) |
| 2445 | { |
| 2446 | fprintf(f, "SUBALIGN("); |
| 2447 | this->subalign_->print(f); |
| 2448 | fprintf(f, ") "); |
| 2449 | } |
| 2450 | |
| 2451 | fprintf(f, "{\n"); |
| 2452 | |
| 2453 | for (Output_section_elements::const_iterator p = this->elements_.begin(); |
| 2454 | p != this->elements_.end(); |
| 2455 | ++p) |
| 2456 | (*p)->print(f); |
| 2457 | |
| 2458 | fprintf(f, " }"); |
| 2459 | |
| 2460 | if (this->fill_ != NULL) |
| 2461 | { |
| 2462 | fprintf(f, " = "); |
| 2463 | this->fill_->print(f); |
| 2464 | } |
| 2465 | |
| 2466 | if (this->phdrs_ != NULL) |
| 2467 | { |
| 2468 | for (String_list::const_iterator p = this->phdrs_->begin(); |
| 2469 | p != this->phdrs_->end(); |
| 2470 | ++p) |
| 2471 | fprintf(f, " :%s", p->c_str()); |
| 2472 | } |
| 2473 | |
| 2474 | fprintf(f, "\n"); |
| 2475 | } |
| 2476 | |
| 2477 | Script_sections::Section_type |
| 2478 | Output_section_definition::section_type() const |
| 2479 | { |
| 2480 | switch (this->script_section_type_) |
| 2481 | { |
| 2482 | case SCRIPT_SECTION_TYPE_NONE: |
| 2483 | return Script_sections::ST_NONE; |
| 2484 | case SCRIPT_SECTION_TYPE_NOLOAD: |
| 2485 | return Script_sections::ST_NOLOAD; |
| 2486 | case SCRIPT_SECTION_TYPE_COPY: |
| 2487 | case SCRIPT_SECTION_TYPE_DSECT: |
| 2488 | case SCRIPT_SECTION_TYPE_INFO: |
| 2489 | case SCRIPT_SECTION_TYPE_OVERLAY: |
| 2490 | // There are not really support so we treat them as ST_NONE. The |
| 2491 | // parse should have issued errors for them already. |
| 2492 | return Script_sections::ST_NONE; |
| 2493 | default: |
| 2494 | gold_unreachable(); |
| 2495 | } |
| 2496 | } |
| 2497 | |
| 2498 | // Return the name of a script section type. |
| 2499 | |
| 2500 | const char* |
| 2501 | Output_section_definition::script_section_type_name( |
| 2502 | Script_section_type script_section_type) |
| 2503 | { |
| 2504 | switch (script_section_type) |
| 2505 | { |
| 2506 | case SCRIPT_SECTION_TYPE_NONE: |
| 2507 | return "NONE"; |
| 2508 | case SCRIPT_SECTION_TYPE_NOLOAD: |
| 2509 | return "NOLOAD"; |
| 2510 | case SCRIPT_SECTION_TYPE_DSECT: |
| 2511 | return "DSECT"; |
| 2512 | case SCRIPT_SECTION_TYPE_COPY: |
| 2513 | return "COPY"; |
| 2514 | case SCRIPT_SECTION_TYPE_INFO: |
| 2515 | return "INFO"; |
| 2516 | case SCRIPT_SECTION_TYPE_OVERLAY: |
| 2517 | return "OVERLAY"; |
| 2518 | default: |
| 2519 | gold_unreachable(); |
| 2520 | } |
| 2521 | } |
| 2522 | |
| 2523 | void |
| 2524 | Output_section_definition::set_memory_region(Memory_region* mr, bool set_vma) |
| 2525 | { |
| 2526 | gold_assert(mr != NULL); |
| 2527 | // Add the current section to the specified region's list. |
| 2528 | mr->add_section(this, set_vma); |
| 2529 | } |
| 2530 | |
| 2531 | // An output section created to hold orphaned input sections. These |
| 2532 | // do not actually appear in linker scripts. However, for convenience |
| 2533 | // when setting the output section addresses, we put a marker to these |
| 2534 | // sections in the appropriate place in the list of SECTIONS elements. |
| 2535 | |
| 2536 | class Orphan_output_section : public Sections_element |
| 2537 | { |
| 2538 | public: |
| 2539 | Orphan_output_section(Output_section* os) |
| 2540 | : os_(os) |
| 2541 | { } |
| 2542 | |
| 2543 | // Return whether the orphan output section is relro. We can just |
| 2544 | // check the output section because we always set the flag, if |
| 2545 | // needed, just after we create the Orphan_output_section. |
| 2546 | bool |
| 2547 | is_relro() const |
| 2548 | { return this->os_->is_relro(); } |
| 2549 | |
| 2550 | // Initialize OSP with an output section. This should have been |
| 2551 | // done already. |
| 2552 | void |
| 2553 | orphan_section_init(Orphan_section_placement*, |
| 2554 | Script_sections::Elements_iterator) |
| 2555 | { gold_unreachable(); } |
| 2556 | |
| 2557 | // Set section addresses. |
| 2558 | void |
| 2559 | set_section_addresses(Symbol_table*, Layout*, uint64_t*, uint64_t*, |
| 2560 | uint64_t*); |
| 2561 | |
| 2562 | // Get the list of segments to use for an allocated section when |
| 2563 | // using a PHDRS clause. |
| 2564 | Output_section* |
| 2565 | allocate_to_segment(String_list**, bool*); |
| 2566 | |
| 2567 | // Return the associated Output_section. |
| 2568 | Output_section* |
| 2569 | get_output_section() const |
| 2570 | { return this->os_; } |
| 2571 | |
| 2572 | // Print for debugging. |
| 2573 | void |
| 2574 | print(FILE* f) const |
| 2575 | { |
| 2576 | fprintf(f, " marker for orphaned output section %s\n", |
| 2577 | this->os_->name()); |
| 2578 | } |
| 2579 | |
| 2580 | private: |
| 2581 | Output_section* os_; |
| 2582 | }; |
| 2583 | |
| 2584 | // Set section addresses. |
| 2585 | |
| 2586 | void |
| 2587 | Orphan_output_section::set_section_addresses(Symbol_table*, Layout*, |
| 2588 | uint64_t* dot_value, |
| 2589 | uint64_t*, |
| 2590 | uint64_t* load_address) |
| 2591 | { |
| 2592 | typedef std::list<Output_section::Input_section> Input_section_list; |
| 2593 | |
| 2594 | bool have_load_address = *load_address != *dot_value; |
| 2595 | |
| 2596 | uint64_t address = *dot_value; |
| 2597 | address = align_address(address, this->os_->addralign()); |
| 2598 | |
| 2599 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) != 0) |
| 2600 | { |
| 2601 | this->os_->set_address(address); |
| 2602 | if (have_load_address) |
| 2603 | this->os_->set_load_address(align_address(*load_address, |
| 2604 | this->os_->addralign())); |
| 2605 | } |
| 2606 | |
| 2607 | Input_section_list input_sections; |
| 2608 | address += this->os_->get_input_sections(address, "", &input_sections); |
| 2609 | |
| 2610 | for (Input_section_list::iterator p = input_sections.begin(); |
| 2611 | p != input_sections.end(); |
| 2612 | ++p) |
| 2613 | { |
| 2614 | uint64_t addralign = p->addralign(); |
| 2615 | if (!p->is_input_section()) |
| 2616 | p->output_section_data()->finalize_data_size(); |
| 2617 | uint64_t size = p->data_size(); |
| 2618 | address = align_address(address, addralign); |
| 2619 | this->os_->add_script_input_section(*p); |
| 2620 | address += size; |
| 2621 | } |
| 2622 | |
| 2623 | // An SHF_TLS/SHT_NOBITS section does not take up any address space. |
| 2624 | if (this->os_ == NULL |
| 2625 | || (this->os_->flags() & elfcpp::SHF_TLS) == 0 |
| 2626 | || this->os_->type() != elfcpp::SHT_NOBITS) |
| 2627 | { |
| 2628 | if (!have_load_address) |
| 2629 | *load_address = address; |
| 2630 | else |
| 2631 | *load_address += address - *dot_value; |
| 2632 | |
| 2633 | *dot_value = address; |
| 2634 | } |
| 2635 | } |
| 2636 | |
| 2637 | // Get the list of segments to use for an allocated section when using |
| 2638 | // a PHDRS clause. If this is an allocated section, return the |
| 2639 | // Output_section. We don't change the list of segments. |
| 2640 | |
| 2641 | Output_section* |
| 2642 | Orphan_output_section::allocate_to_segment(String_list**, bool* orphan) |
| 2643 | { |
| 2644 | if ((this->os_->flags() & elfcpp::SHF_ALLOC) == 0) |
| 2645 | return NULL; |
| 2646 | *orphan = true; |
| 2647 | return this->os_; |
| 2648 | } |
| 2649 | |
| 2650 | // Class Phdrs_element. A program header from a PHDRS clause. |
| 2651 | |
| 2652 | class Phdrs_element |
| 2653 | { |
| 2654 | public: |
| 2655 | Phdrs_element(const char* name, size_t namelen, unsigned int type, |
| 2656 | bool includes_filehdr, bool includes_phdrs, |
| 2657 | bool is_flags_valid, unsigned int flags, |
| 2658 | Expression* load_address) |
| 2659 | : name_(name, namelen), type_(type), includes_filehdr_(includes_filehdr), |
| 2660 | includes_phdrs_(includes_phdrs), is_flags_valid_(is_flags_valid), |
| 2661 | flags_(flags), load_address_(load_address), load_address_value_(0), |
| 2662 | segment_(NULL) |
| 2663 | { } |
| 2664 | |
| 2665 | // Return the name of this segment. |
| 2666 | const std::string& |
| 2667 | name() const |
| 2668 | { return this->name_; } |
| 2669 | |
| 2670 | // Return the type of the segment. |
| 2671 | unsigned int |
| 2672 | type() const |
| 2673 | { return this->type_; } |
| 2674 | |
| 2675 | // Whether to include the file header. |
| 2676 | bool |
| 2677 | includes_filehdr() const |
| 2678 | { return this->includes_filehdr_; } |
| 2679 | |
| 2680 | // Whether to include the program headers. |
| 2681 | bool |
| 2682 | includes_phdrs() const |
| 2683 | { return this->includes_phdrs_; } |
| 2684 | |
| 2685 | // Return whether there is a load address. |
| 2686 | bool |
| 2687 | has_load_address() const |
| 2688 | { return this->load_address_ != NULL; } |
| 2689 | |
| 2690 | // Evaluate the load address expression if there is one. |
| 2691 | void |
| 2692 | eval_load_address(Symbol_table* symtab, Layout* layout) |
| 2693 | { |
| 2694 | if (this->load_address_ != NULL) |
| 2695 | this->load_address_value_ = this->load_address_->eval(symtab, layout, |
| 2696 | true); |
| 2697 | } |
| 2698 | |
| 2699 | // Return the load address. |
| 2700 | uint64_t |
| 2701 | load_address() const |
| 2702 | { |
| 2703 | gold_assert(this->load_address_ != NULL); |
| 2704 | return this->load_address_value_; |
| 2705 | } |
| 2706 | |
| 2707 | // Create the segment. |
| 2708 | Output_segment* |
| 2709 | create_segment(Layout* layout) |
| 2710 | { |
| 2711 | this->segment_ = layout->make_output_segment(this->type_, this->flags_); |
| 2712 | return this->segment_; |
| 2713 | } |
| 2714 | |
| 2715 | // Return the segment. |
| 2716 | Output_segment* |
| 2717 | segment() |
| 2718 | { return this->segment_; } |
| 2719 | |
| 2720 | // Release the segment. |
| 2721 | void |
| 2722 | release_segment() |
| 2723 | { this->segment_ = NULL; } |
| 2724 | |
| 2725 | // Set the segment flags if appropriate. |
| 2726 | void |
| 2727 | set_flags_if_valid() |
| 2728 | { |
| 2729 | if (this->is_flags_valid_) |
| 2730 | this->segment_->set_flags(this->flags_); |
| 2731 | } |
| 2732 | |
| 2733 | // Print for debugging. |
| 2734 | void |
| 2735 | print(FILE*) const; |
| 2736 | |
| 2737 | private: |
| 2738 | // The name used in the script. |
| 2739 | std::string name_; |
| 2740 | // The type of the segment (PT_LOAD, etc.). |
| 2741 | unsigned int type_; |
| 2742 | // Whether this segment includes the file header. |
| 2743 | bool includes_filehdr_; |
| 2744 | // Whether this segment includes the section headers. |
| 2745 | bool includes_phdrs_; |
| 2746 | // Whether the flags were explicitly specified. |
| 2747 | bool is_flags_valid_; |
| 2748 | // The flags for this segment (PF_R, etc.) if specified. |
| 2749 | unsigned int flags_; |
| 2750 | // The expression for the load address for this segment. This may |
| 2751 | // be NULL. |
| 2752 | Expression* load_address_; |
| 2753 | // The actual load address from evaluating the expression. |
| 2754 | uint64_t load_address_value_; |
| 2755 | // The segment itself. |
| 2756 | Output_segment* segment_; |
| 2757 | }; |
| 2758 | |
| 2759 | // Print for debugging. |
| 2760 | |
| 2761 | void |
| 2762 | Phdrs_element::print(FILE* f) const |
| 2763 | { |
| 2764 | fprintf(f, " %s 0x%x", this->name_.c_str(), this->type_); |
| 2765 | if (this->includes_filehdr_) |
| 2766 | fprintf(f, " FILEHDR"); |
| 2767 | if (this->includes_phdrs_) |
| 2768 | fprintf(f, " PHDRS"); |
| 2769 | if (this->is_flags_valid_) |
| 2770 | fprintf(f, " FLAGS(%u)", this->flags_); |
| 2771 | if (this->load_address_ != NULL) |
| 2772 | { |
| 2773 | fprintf(f, " AT("); |
| 2774 | this->load_address_->print(f); |
| 2775 | fprintf(f, ")"); |
| 2776 | } |
| 2777 | fprintf(f, ";\n"); |
| 2778 | } |
| 2779 | |
| 2780 | // Add a memory region. |
| 2781 | |
| 2782 | void |
| 2783 | Script_sections::add_memory_region(const char* name, size_t namelen, |
| 2784 | unsigned int attributes, |
| 2785 | Expression* start, Expression* length) |
| 2786 | { |
| 2787 | if (this->memory_regions_ == NULL) |
| 2788 | this->memory_regions_ = new Memory_regions(); |
| 2789 | else if (this->find_memory_region(name, namelen)) |
| 2790 | { |
| 2791 | gold_error (_("region '%.*s' already defined"), static_cast<int>(namelen), |
| 2792 | name); |
| 2793 | // FIXME: Add a GOLD extension to allow multiple regions with the same |
| 2794 | // name. This would amount to a single region covering disjoint blocks |
| 2795 | // of memory, which is useful for embedded devices. |
| 2796 | } |
| 2797 | |
| 2798 | // FIXME: Check the length and start values. Currently we allow |
| 2799 | // non-constant expressions for these values, whereas LD does not. |
| 2800 | |
| 2801 | // FIXME: Add a GOLD extension to allow NEGATIVE LENGTHS. This would |
| 2802 | // describe a region that packs from the end address going down, rather |
| 2803 | // than the start address going up. This would be useful for embedded |
| 2804 | // devices. |
| 2805 | |
| 2806 | this->memory_regions_->push_back(new Memory_region(name, namelen, attributes, |
| 2807 | start, length)); |
| 2808 | } |
| 2809 | |
| 2810 | // Find a memory region. |
| 2811 | |
| 2812 | Memory_region* |
| 2813 | Script_sections::find_memory_region(const char* name, size_t namelen) |
| 2814 | { |
| 2815 | if (this->memory_regions_ == NULL) |
| 2816 | return NULL; |
| 2817 | |
| 2818 | for (Memory_regions::const_iterator m = this->memory_regions_->begin(); |
| 2819 | m != this->memory_regions_->end(); |
| 2820 | ++m) |
| 2821 | if ((*m)->name_match(name, namelen)) |
| 2822 | return *m; |
| 2823 | |
| 2824 | return NULL; |
| 2825 | } |
| 2826 | |
| 2827 | // Find a memory region's origin. |
| 2828 | |
| 2829 | Expression* |
| 2830 | Script_sections::find_memory_region_origin(const char* name, size_t namelen) |
| 2831 | { |
| 2832 | Memory_region* mr = find_memory_region(name, namelen); |
| 2833 | if (mr == NULL) |
| 2834 | return NULL; |
| 2835 | |
| 2836 | return mr->start_address(); |
| 2837 | } |
| 2838 | |
| 2839 | // Find a memory region's length. |
| 2840 | |
| 2841 | Expression* |
| 2842 | Script_sections::find_memory_region_length(const char* name, size_t namelen) |
| 2843 | { |
| 2844 | Memory_region* mr = find_memory_region(name, namelen); |
| 2845 | if (mr == NULL) |
| 2846 | return NULL; |
| 2847 | |
| 2848 | return mr->length(); |
| 2849 | } |
| 2850 | |
| 2851 | // Set the memory region to use for the current section. |
| 2852 | |
| 2853 | void |
| 2854 | Script_sections::set_memory_region(Memory_region* mr, bool set_vma) |
| 2855 | { |
| 2856 | gold_assert(!this->sections_elements_->empty()); |
| 2857 | this->sections_elements_->back()->set_memory_region(mr, set_vma); |
| 2858 | } |
| 2859 | |
| 2860 | // Class Script_sections. |
| 2861 | |
| 2862 | Script_sections::Script_sections() |
| 2863 | : saw_sections_clause_(false), |
| 2864 | in_sections_clause_(false), |
| 2865 | sections_elements_(NULL), |
| 2866 | output_section_(NULL), |
| 2867 | memory_regions_(NULL), |
| 2868 | phdrs_elements_(NULL), |
| 2869 | orphan_section_placement_(NULL), |
| 2870 | data_segment_align_start_(), |
| 2871 | saw_data_segment_align_(false), |
| 2872 | saw_relro_end_(false), |
| 2873 | saw_segment_start_expression_(false) |
| 2874 | { |
| 2875 | } |
| 2876 | |
| 2877 | // Start a SECTIONS clause. |
| 2878 | |
| 2879 | void |
| 2880 | Script_sections::start_sections() |
| 2881 | { |
| 2882 | gold_assert(!this->in_sections_clause_ && this->output_section_ == NULL); |
| 2883 | this->saw_sections_clause_ = true; |
| 2884 | this->in_sections_clause_ = true; |
| 2885 | if (this->sections_elements_ == NULL) |
| 2886 | this->sections_elements_ = new Sections_elements; |
| 2887 | } |
| 2888 | |
| 2889 | // Finish a SECTIONS clause. |
| 2890 | |
| 2891 | void |
| 2892 | Script_sections::finish_sections() |
| 2893 | { |
| 2894 | gold_assert(this->in_sections_clause_ && this->output_section_ == NULL); |
| 2895 | this->in_sections_clause_ = false; |
| 2896 | } |
| 2897 | |
| 2898 | // Add a symbol to be defined. |
| 2899 | |
| 2900 | void |
| 2901 | Script_sections::add_symbol_assignment(const char* name, size_t length, |
| 2902 | Expression* val, bool provide, |
| 2903 | bool hidden) |
| 2904 | { |
| 2905 | if (this->output_section_ != NULL) |
| 2906 | this->output_section_->add_symbol_assignment(name, length, val, |
| 2907 | provide, hidden); |
| 2908 | else |
| 2909 | { |
| 2910 | Sections_element* p = new Sections_element_assignment(name, length, |
| 2911 | val, provide, |
| 2912 | hidden); |
| 2913 | this->sections_elements_->push_back(p); |
| 2914 | } |
| 2915 | } |
| 2916 | |
| 2917 | // Add an assignment to the special dot symbol. |
| 2918 | |
| 2919 | void |
| 2920 | Script_sections::add_dot_assignment(Expression* val) |
| 2921 | { |
| 2922 | if (this->output_section_ != NULL) |
| 2923 | this->output_section_->add_dot_assignment(val); |
| 2924 | else |
| 2925 | { |
| 2926 | // The GNU linker permits assignments to . to appears outside of |
| 2927 | // a SECTIONS clause, and treats it as appearing inside, so |
| 2928 | // sections_elements_ may be NULL here. |
| 2929 | if (this->sections_elements_ == NULL) |
| 2930 | { |
| 2931 | this->sections_elements_ = new Sections_elements; |
| 2932 | this->saw_sections_clause_ = true; |
| 2933 | } |
| 2934 | |
| 2935 | Sections_element* p = new Sections_element_dot_assignment(val); |
| 2936 | this->sections_elements_->push_back(p); |
| 2937 | } |
| 2938 | } |
| 2939 | |
| 2940 | // Add an assertion. |
| 2941 | |
| 2942 | void |
| 2943 | Script_sections::add_assertion(Expression* check, const char* message, |
| 2944 | size_t messagelen) |
| 2945 | { |
| 2946 | if (this->output_section_ != NULL) |
| 2947 | this->output_section_->add_assertion(check, message, messagelen); |
| 2948 | else |
| 2949 | { |
| 2950 | Sections_element* p = new Sections_element_assertion(check, message, |
| 2951 | messagelen); |
| 2952 | this->sections_elements_->push_back(p); |
| 2953 | } |
| 2954 | } |
| 2955 | |
| 2956 | // Start processing entries for an output section. |
| 2957 | |
| 2958 | void |
| 2959 | Script_sections::start_output_section( |
| 2960 | const char* name, |
| 2961 | size_t namelen, |
| 2962 | const Parser_output_section_header* header) |
| 2963 | { |
| 2964 | Output_section_definition* posd = new Output_section_definition(name, |
| 2965 | namelen, |
| 2966 | header); |
| 2967 | this->sections_elements_->push_back(posd); |
| 2968 | gold_assert(this->output_section_ == NULL); |
| 2969 | this->output_section_ = posd; |
| 2970 | } |
| 2971 | |
| 2972 | // Stop processing entries for an output section. |
| 2973 | |
| 2974 | void |
| 2975 | Script_sections::finish_output_section( |
| 2976 | const Parser_output_section_trailer* trailer) |
| 2977 | { |
| 2978 | gold_assert(this->output_section_ != NULL); |
| 2979 | this->output_section_->finish(trailer); |
| 2980 | this->output_section_ = NULL; |
| 2981 | } |
| 2982 | |
| 2983 | // Add a data item to the current output section. |
| 2984 | |
| 2985 | void |
| 2986 | Script_sections::add_data(int size, bool is_signed, Expression* val) |
| 2987 | { |
| 2988 | gold_assert(this->output_section_ != NULL); |
| 2989 | this->output_section_->add_data(size, is_signed, val); |
| 2990 | } |
| 2991 | |
| 2992 | // Add a fill value setting to the current output section. |
| 2993 | |
| 2994 | void |
| 2995 | Script_sections::add_fill(Expression* val) |
| 2996 | { |
| 2997 | gold_assert(this->output_section_ != NULL); |
| 2998 | this->output_section_->add_fill(val); |
| 2999 | } |
| 3000 | |
| 3001 | // Add an input section specification to the current output section. |
| 3002 | |
| 3003 | void |
| 3004 | Script_sections::add_input_section(const Input_section_spec* spec, bool keep) |
| 3005 | { |
| 3006 | gold_assert(this->output_section_ != NULL); |
| 3007 | this->output_section_->add_input_section(spec, keep); |
| 3008 | } |
| 3009 | |
| 3010 | // This is called when we see DATA_SEGMENT_ALIGN. It means that any |
| 3011 | // subsequent output sections may be relro. |
| 3012 | |
| 3013 | void |
| 3014 | Script_sections::data_segment_align() |
| 3015 | { |
| 3016 | if (this->saw_data_segment_align_) |
| 3017 | gold_error(_("DATA_SEGMENT_ALIGN may only appear once in a linker script")); |
| 3018 | gold_assert(!this->sections_elements_->empty()); |
| 3019 | Sections_elements::iterator p = this->sections_elements_->end(); |
| 3020 | --p; |
| 3021 | this->data_segment_align_start_ = p; |
| 3022 | this->saw_data_segment_align_ = true; |
| 3023 | } |
| 3024 | |
| 3025 | // This is called when we see DATA_SEGMENT_RELRO_END. It means that |
| 3026 | // any output sections seen since DATA_SEGMENT_ALIGN are relro. |
| 3027 | |
| 3028 | void |
| 3029 | Script_sections::data_segment_relro_end() |
| 3030 | { |
| 3031 | if (this->saw_relro_end_) |
| 3032 | gold_error(_("DATA_SEGMENT_RELRO_END may only appear once " |
| 3033 | "in a linker script")); |
| 3034 | this->saw_relro_end_ = true; |
| 3035 | |
| 3036 | if (!this->saw_data_segment_align_) |
| 3037 | gold_error(_("DATA_SEGMENT_RELRO_END must follow DATA_SEGMENT_ALIGN")); |
| 3038 | else |
| 3039 | { |
| 3040 | Sections_elements::iterator p = this->data_segment_align_start_; |
| 3041 | for (++p; p != this->sections_elements_->end(); ++p) |
| 3042 | (*p)->set_is_relro(); |
| 3043 | } |
| 3044 | } |
| 3045 | |
| 3046 | // Create any required sections. |
| 3047 | |
| 3048 | void |
| 3049 | Script_sections::create_sections(Layout* layout) |
| 3050 | { |
| 3051 | if (!this->saw_sections_clause_) |
| 3052 | return; |
| 3053 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
| 3054 | p != this->sections_elements_->end(); |
| 3055 | ++p) |
| 3056 | (*p)->create_sections(layout); |
| 3057 | } |
| 3058 | |
| 3059 | // Add any symbols we are defining to the symbol table. |
| 3060 | |
| 3061 | void |
| 3062 | Script_sections::add_symbols_to_table(Symbol_table* symtab) |
| 3063 | { |
| 3064 | if (!this->saw_sections_clause_) |
| 3065 | return; |
| 3066 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
| 3067 | p != this->sections_elements_->end(); |
| 3068 | ++p) |
| 3069 | (*p)->add_symbols_to_table(symtab); |
| 3070 | } |
| 3071 | |
| 3072 | // Finalize symbols and check assertions. |
| 3073 | |
| 3074 | void |
| 3075 | Script_sections::finalize_symbols(Symbol_table* symtab, const Layout* layout) |
| 3076 | { |
| 3077 | if (!this->saw_sections_clause_) |
| 3078 | return; |
| 3079 | uint64_t dot_value = 0; |
| 3080 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
| 3081 | p != this->sections_elements_->end(); |
| 3082 | ++p) |
| 3083 | (*p)->finalize_symbols(symtab, layout, &dot_value); |
| 3084 | } |
| 3085 | |
| 3086 | // Return the name of the output section to use for an input file name |
| 3087 | // and section name. |
| 3088 | |
| 3089 | const char* |
| 3090 | Script_sections::output_section_name( |
| 3091 | const char* file_name, |
| 3092 | const char* section_name, |
| 3093 | Output_section*** output_section_slot, |
| 3094 | Script_sections::Section_type* psection_type) |
| 3095 | { |
| 3096 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); |
| 3097 | p != this->sections_elements_->end(); |
| 3098 | ++p) |
| 3099 | { |
| 3100 | const char* ret = (*p)->output_section_name(file_name, section_name, |
| 3101 | output_section_slot, |
| 3102 | psection_type); |
| 3103 | |
| 3104 | if (ret != NULL) |
| 3105 | { |
| 3106 | // The special name /DISCARD/ means that the input section |
| 3107 | // should be discarded. |
| 3108 | if (strcmp(ret, "/DISCARD/") == 0) |
| 3109 | { |
| 3110 | *output_section_slot = NULL; |
| 3111 | *psection_type = Script_sections::ST_NONE; |
| 3112 | return NULL; |
| 3113 | } |
| 3114 | return ret; |
| 3115 | } |
| 3116 | } |
| 3117 | |
| 3118 | // If we couldn't find a mapping for the name, the output section |
| 3119 | // gets the name of the input section. |
| 3120 | |
| 3121 | *output_section_slot = NULL; |
| 3122 | *psection_type = Script_sections::ST_NONE; |
| 3123 | |
| 3124 | return section_name; |
| 3125 | } |
| 3126 | |
| 3127 | // Place a marker for an orphan output section into the SECTIONS |
| 3128 | // clause. |
| 3129 | |
| 3130 | void |
| 3131 | Script_sections::place_orphan(Output_section* os) |
| 3132 | { |
| 3133 | Orphan_section_placement* osp = this->orphan_section_placement_; |
| 3134 | if (osp == NULL) |
| 3135 | { |
| 3136 | // Initialize the Orphan_section_placement structure. |
| 3137 | osp = new Orphan_section_placement(); |
| 3138 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
| 3139 | p != this->sections_elements_->end(); |
| 3140 | ++p) |
| 3141 | (*p)->orphan_section_init(osp, p); |
| 3142 | gold_assert(!this->sections_elements_->empty()); |
| 3143 | Sections_elements::iterator last = this->sections_elements_->end(); |
| 3144 | --last; |
| 3145 | osp->last_init(last); |
| 3146 | this->orphan_section_placement_ = osp; |
| 3147 | } |
| 3148 | |
| 3149 | Orphan_output_section* orphan = new Orphan_output_section(os); |
| 3150 | |
| 3151 | // Look for where to put ORPHAN. |
| 3152 | Sections_elements::iterator* where; |
| 3153 | if (osp->find_place(os, &where)) |
| 3154 | { |
| 3155 | if ((**where)->is_relro()) |
| 3156 | os->set_is_relro(); |
| 3157 | else |
| 3158 | os->clear_is_relro(); |
| 3159 | |
| 3160 | // We want to insert ORPHAN after *WHERE, and then update *WHERE |
| 3161 | // so that the next one goes after this one. |
| 3162 | Sections_elements::iterator p = *where; |
| 3163 | gold_assert(p != this->sections_elements_->end()); |
| 3164 | ++p; |
| 3165 | *where = this->sections_elements_->insert(p, orphan); |
| 3166 | } |
| 3167 | else |
| 3168 | { |
| 3169 | os->clear_is_relro(); |
| 3170 | // We don't have a place to put this orphan section. Put it, |
| 3171 | // and all other sections like it, at the end, but before the |
| 3172 | // sections which always come at the end. |
| 3173 | Sections_elements::iterator last = osp->last_place(); |
| 3174 | *where = this->sections_elements_->insert(last, orphan); |
| 3175 | } |
| 3176 | } |
| 3177 | |
| 3178 | // Set the addresses of all the output sections. Walk through all the |
| 3179 | // elements, tracking the dot symbol. Apply assignments which set |
| 3180 | // absolute symbol values, in case they are used when setting dot. |
| 3181 | // Fill in data statement values. As we find output sections, set the |
| 3182 | // address, set the address of all associated input sections, and |
| 3183 | // update dot. Return the segment which should hold the file header |
| 3184 | // and segment headers, if any. |
| 3185 | |
| 3186 | Output_segment* |
| 3187 | Script_sections::set_section_addresses(Symbol_table* symtab, Layout* layout) |
| 3188 | { |
| 3189 | gold_assert(this->saw_sections_clause_); |
| 3190 | |
| 3191 | // Walk the memory regions specified in this script, if any. |
| 3192 | if (this->memory_regions_ != NULL) |
| 3193 | { |
| 3194 | for (Memory_regions::const_iterator mr = this->memory_regions_->begin(); |
| 3195 | mr != this->memory_regions_->end(); |
| 3196 | ++mr) |
| 3197 | { |
| 3198 | // FIXME: What should we do with the attributes of the regions ? |
| 3199 | |
| 3200 | // For each region, set the VMA of the sections associated with it. |
| 3201 | for (Memory_region::Section_list::const_iterator s = |
| 3202 | (*mr)->get_vma_section_list_start(); |
| 3203 | s != (*mr)->get_vma_section_list_end(); |
| 3204 | ++s) |
| 3205 | { |
| 3206 | (*s)->set_section_vma((*mr)->get_current_vma_address()); |
| 3207 | (*mr)->increment_vma_offset((*s)->get_section_name(), |
| 3208 | (*s)->get_output_section()->current_data_size(), |
| 3209 | symtab, layout); |
| 3210 | } |
| 3211 | |
| 3212 | // Similarly, set the LMA values. |
| 3213 | for (Memory_region::Section_list::const_iterator s = |
| 3214 | (*mr)->get_lma_section_list_start(); |
| 3215 | s != (*mr)->get_lma_section_list_end(); |
| 3216 | ++s) |
| 3217 | { |
| 3218 | (*s)->set_section_lma((*mr)->get_current_lma_address()); |
| 3219 | (*mr)->increment_lma_offset((*s)->get_section_name(), |
| 3220 | (*s)->get_output_section()->current_data_size(), |
| 3221 | symtab, layout); |
| 3222 | } |
| 3223 | } |
| 3224 | } |
| 3225 | |
| 3226 | // Implement ONLY_IF_RO/ONLY_IF_RW constraints. These are a pain |
| 3227 | // for our representation. |
| 3228 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
| 3229 | p != this->sections_elements_->end(); |
| 3230 | ++p) |
| 3231 | { |
| 3232 | Output_section_definition* posd; |
| 3233 | Section_constraint failed_constraint = (*p)->check_constraint(&posd); |
| 3234 | if (failed_constraint != CONSTRAINT_NONE) |
| 3235 | { |
| 3236 | Sections_elements::iterator q; |
| 3237 | for (q = this->sections_elements_->begin(); |
| 3238 | q != this->sections_elements_->end(); |
| 3239 | ++q) |
| 3240 | { |
| 3241 | if (q != p) |
| 3242 | { |
| 3243 | if ((*q)->alternate_constraint(posd, failed_constraint)) |
| 3244 | break; |
| 3245 | } |
| 3246 | } |
| 3247 | |
| 3248 | if (q == this->sections_elements_->end()) |
| 3249 | gold_error(_("no matching section constraint")); |
| 3250 | } |
| 3251 | } |
| 3252 | |
| 3253 | // Force the alignment of the first TLS section to be the maximum |
| 3254 | // alignment of all TLS sections. |
| 3255 | Output_section* first_tls = NULL; |
| 3256 | uint64_t tls_align = 0; |
| 3257 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); |
| 3258 | p != this->sections_elements_->end(); |
| 3259 | ++p) |
| 3260 | { |
| 3261 | Output_section* os = (*p)->get_output_section(); |
| 3262 | if (os != NULL && (os->flags() & elfcpp::SHF_TLS) != 0) |
| 3263 | { |
| 3264 | if (first_tls == NULL) |
| 3265 | first_tls = os; |
| 3266 | if (os->addralign() > tls_align) |
| 3267 | tls_align = os->addralign(); |
| 3268 | } |
| 3269 | } |
| 3270 | if (first_tls != NULL) |
| 3271 | first_tls->set_addralign(tls_align); |
| 3272 | |
| 3273 | // For a relocatable link, we implicitly set dot to zero. |
| 3274 | uint64_t dot_value = 0; |
| 3275 | uint64_t dot_alignment = 0; |
| 3276 | uint64_t load_address = 0; |
| 3277 | |
| 3278 | // Check to see if we want to use any of -Ttext, -Tdata and -Tbss options |
| 3279 | // to set section addresses. If the script has any SEGMENT_START |
| 3280 | // expression, we do not set the section addresses. |
| 3281 | bool use_tsection_options = |
| 3282 | (!this->saw_segment_start_expression_ |
| 3283 | && (parameters->options().user_set_Ttext() |
| 3284 | || parameters->options().user_set_Tdata() |
| 3285 | || parameters->options().user_set_Tbss())); |
| 3286 | |
| 3287 | for (Sections_elements::iterator p = this->sections_elements_->begin(); |
| 3288 | p != this->sections_elements_->end(); |
| 3289 | ++p) |
| 3290 | { |
| 3291 | Output_section* os = (*p)->get_output_section(); |
| 3292 | |
| 3293 | // Handle -Ttext, -Tdata and -Tbss options. We do this by looking for |
| 3294 | // the special sections by names and doing dot assignments. |
| 3295 | if (use_tsection_options |
| 3296 | && os != NULL |
| 3297 | && (os->flags() & elfcpp::SHF_ALLOC) != 0) |
| 3298 | { |
| 3299 | uint64_t new_dot_value = dot_value; |
| 3300 | |
| 3301 | if (parameters->options().user_set_Ttext() |
| 3302 | && strcmp(os->name(), ".text") == 0) |
| 3303 | new_dot_value = parameters->options().Ttext(); |
| 3304 | else if (parameters->options().user_set_Tdata() |
| 3305 | && strcmp(os->name(), ".data") == 0) |
| 3306 | new_dot_value = parameters->options().Tdata(); |
| 3307 | else if (parameters->options().user_set_Tbss() |
| 3308 | && strcmp(os->name(), ".bss") == 0) |
| 3309 | new_dot_value = parameters->options().Tbss(); |
| 3310 | |
| 3311 | // Update dot and load address if necessary. |
| 3312 | if (new_dot_value < dot_value) |
| 3313 | gold_error(_("dot may not move backward")); |
| 3314 | else if (new_dot_value != dot_value) |
| 3315 | { |
| 3316 | dot_value = new_dot_value; |
| 3317 | load_address = new_dot_value; |
| 3318 | } |
| 3319 | } |
| 3320 | |
| 3321 | (*p)->set_section_addresses(symtab, layout, &dot_value, &dot_alignment, |
| 3322 | &load_address); |
| 3323 | } |
| 3324 | |
| 3325 | if (this->phdrs_elements_ != NULL) |
| 3326 | { |
| 3327 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); |
| 3328 | p != this->phdrs_elements_->end(); |
| 3329 | ++p) |
| 3330 | (*p)->eval_load_address(symtab, layout); |
| 3331 | } |
| 3332 | |
| 3333 | return this->create_segments(layout, dot_alignment); |
| 3334 | } |
| 3335 | |
| 3336 | // Sort the sections in order to put them into segments. |
| 3337 | |
| 3338 | class Sort_output_sections |
| 3339 | { |
| 3340 | public: |
| 3341 | bool |
| 3342 | operator()(const Output_section* os1, const Output_section* os2) const; |
| 3343 | }; |
| 3344 | |
| 3345 | bool |
| 3346 | Sort_output_sections::operator()(const Output_section* os1, |
| 3347 | const Output_section* os2) const |
| 3348 | { |
| 3349 | // Sort first by the load address. |
| 3350 | uint64_t lma1 = (os1->has_load_address() |
| 3351 | ? os1->load_address() |
| 3352 | : os1->address()); |
| 3353 | uint64_t lma2 = (os2->has_load_address() |
| 3354 | ? os2->load_address() |
| 3355 | : os2->address()); |
| 3356 | if (lma1 != lma2) |
| 3357 | return lma1 < lma2; |
| 3358 | |
| 3359 | // Then sort by the virtual address. |
| 3360 | if (os1->address() != os2->address()) |
| 3361 | return os1->address() < os2->address(); |
| 3362 | |
| 3363 | // Sort TLS sections to the end. |
| 3364 | bool tls1 = (os1->flags() & elfcpp::SHF_TLS) != 0; |
| 3365 | bool tls2 = (os2->flags() & elfcpp::SHF_TLS) != 0; |
| 3366 | if (tls1 != tls2) |
| 3367 | return tls2; |
| 3368 | |
| 3369 | // Sort PROGBITS before NOBITS. |
| 3370 | if (os1->type() == elfcpp::SHT_PROGBITS && os2->type() == elfcpp::SHT_NOBITS) |
| 3371 | return true; |
| 3372 | if (os1->type() == elfcpp::SHT_NOBITS && os2->type() == elfcpp::SHT_PROGBITS) |
| 3373 | return false; |
| 3374 | |
| 3375 | // Sort non-NOLOAD before NOLOAD. |
| 3376 | if (os1->is_noload() && !os2->is_noload()) |
| 3377 | return true; |
| 3378 | if (!os1->is_noload() && os2->is_noload()) |
| 3379 | return true; |
| 3380 | |
| 3381 | // Otherwise we don't care. |
| 3382 | return false; |
| 3383 | } |
| 3384 | |
| 3385 | // Return whether OS is a BSS section. This is a SHT_NOBITS section. |
| 3386 | // We treat a section with the SHF_TLS flag set as taking up space |
| 3387 | // even if it is SHT_NOBITS (this is true of .tbss), as we allocate |
| 3388 | // space for them in the file. |
| 3389 | |
| 3390 | bool |
| 3391 | Script_sections::is_bss_section(const Output_section* os) |
| 3392 | { |
| 3393 | return (os->type() == elfcpp::SHT_NOBITS |
| 3394 | && (os->flags() & elfcpp::SHF_TLS) == 0); |
| 3395 | } |
| 3396 | |
| 3397 | // Return the size taken by the file header and the program headers. |
| 3398 | |
| 3399 | size_t |
| 3400 | Script_sections::total_header_size(Layout* layout) const |
| 3401 | { |
| 3402 | size_t segment_count = layout->segment_count(); |
| 3403 | size_t file_header_size; |
| 3404 | size_t segment_headers_size; |
| 3405 | if (parameters->target().get_size() == 32) |
| 3406 | { |
| 3407 | file_header_size = elfcpp::Elf_sizes<32>::ehdr_size; |
| 3408 | segment_headers_size = segment_count * elfcpp::Elf_sizes<32>::phdr_size; |
| 3409 | } |
| 3410 | else if (parameters->target().get_size() == 64) |
| 3411 | { |
| 3412 | file_header_size = elfcpp::Elf_sizes<64>::ehdr_size; |
| 3413 | segment_headers_size = segment_count * elfcpp::Elf_sizes<64>::phdr_size; |
| 3414 | } |
| 3415 | else |
| 3416 | gold_unreachable(); |
| 3417 | |
| 3418 | return file_header_size + segment_headers_size; |
| 3419 | } |
| 3420 | |
| 3421 | // Return the amount we have to subtract from the LMA to accomodate |
| 3422 | // headers of the given size. The complication is that the file |
| 3423 | // header have to be at the start of a page, as otherwise it will not |
| 3424 | // be at the start of the file. |
| 3425 | |
| 3426 | uint64_t |
| 3427 | Script_sections::header_size_adjustment(uint64_t lma, |
| 3428 | size_t sizeof_headers) const |
| 3429 | { |
| 3430 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
| 3431 | uint64_t hdr_lma = lma - sizeof_headers; |
| 3432 | hdr_lma &= ~(abi_pagesize - 1); |
| 3433 | return lma - hdr_lma; |
| 3434 | } |
| 3435 | |
| 3436 | // Create the PT_LOAD segments when using a SECTIONS clause. Returns |
| 3437 | // the segment which should hold the file header and segment headers, |
| 3438 | // if any. |
| 3439 | |
| 3440 | Output_segment* |
| 3441 | Script_sections::create_segments(Layout* layout, uint64_t dot_alignment) |
| 3442 | { |
| 3443 | gold_assert(this->saw_sections_clause_); |
| 3444 | |
| 3445 | if (parameters->options().relocatable()) |
| 3446 | return NULL; |
| 3447 | |
| 3448 | if (this->saw_phdrs_clause()) |
| 3449 | return create_segments_from_phdrs_clause(layout, dot_alignment); |
| 3450 | |
| 3451 | Layout::Section_list sections; |
| 3452 | layout->get_allocated_sections(§ions); |
| 3453 | |
| 3454 | // Sort the sections by address. |
| 3455 | std::stable_sort(sections.begin(), sections.end(), Sort_output_sections()); |
| 3456 | |
| 3457 | this->create_note_and_tls_segments(layout, §ions); |
| 3458 | |
| 3459 | // Walk through the sections adding them to PT_LOAD segments. |
| 3460 | const uint64_t abi_pagesize = parameters->target().abi_pagesize(); |
| 3461 | Output_segment* first_seg = NULL; |
| 3462 | Output_segment* current_seg = NULL; |
| 3463 | bool is_current_seg_readonly = true; |
| 3464 | Layout::Section_list::iterator plast = sections.end(); |
| 3465 | uint64_t last_vma = 0; |
| 3466 | uint64_t last_lma = 0; |
| 3467 | uint64_t last_size = 0; |
| 3468 | for (Layout::Section_list::iterator p = sections.begin(); |
| 3469 | p != sections.end(); |
| 3470 | ++p) |
| 3471 | { |
| 3472 | const uint64_t vma = (*p)->address(); |
| 3473 | const uint64_t lma = ((*p)->has_load_address() |
| 3474 | ? (*p)->load_address() |
| 3475 | : vma); |
| 3476 | const uint64_t size = (*p)->current_data_size(); |
| 3477 | |
| 3478 | bool need_new_segment; |
| 3479 | if (current_seg == NULL) |
| 3480 | need_new_segment = true; |
| 3481 | else if (lma - vma != last_lma - last_vma) |
| 3482 | { |
| 3483 | // This section has a different LMA relationship than the |
| 3484 | // last one; we need a new segment. |
| 3485 | need_new_segment = true; |
| 3486 | } |
| 3487 | else if (align_address(last_lma + last_size, abi_pagesize) |
| 3488 | < align_address(lma, abi_pagesize)) |
| 3489 | { |
| 3490 | // Putting this section in the segment would require |
| 3491 | // skipping a page. |
| 3492 | need_new_segment = true; |
| 3493 | } |
| 3494 | else if (is_bss_section(*plast) && !is_bss_section(*p)) |
| 3495 | { |
| 3496 | // A non-BSS section can not follow a BSS section in the |
| 3497 | // same segment. |
| 3498 | need_new_segment = true; |
| 3499 | } |
| 3500 | else if (is_current_seg_readonly |
| 3501 | && ((*p)->flags() & elfcpp::SHF_WRITE) != 0 |
| 3502 | && !parameters->options().omagic()) |
| 3503 | { |
| 3504 | // Don't put a writable section in the same segment as a |
| 3505 | // non-writable section. |
| 3506 | need_new_segment = true; |
| 3507 | } |
| 3508 | else |
| 3509 | { |
| 3510 | // Otherwise, reuse the existing segment. |
| 3511 | need_new_segment = false; |
| 3512 | } |
| 3513 | |
| 3514 | elfcpp::Elf_Word seg_flags = |
| 3515 | Layout::section_flags_to_segment((*p)->flags()); |
| 3516 | |
| 3517 | if (need_new_segment) |
| 3518 | { |
| 3519 | current_seg = layout->make_output_segment(elfcpp::PT_LOAD, |
| 3520 | seg_flags); |
| 3521 | current_seg->set_addresses(vma, lma); |
| 3522 | current_seg->set_minimum_p_align(dot_alignment); |
| 3523 | if (first_seg == NULL) |
| 3524 | first_seg = current_seg; |
| 3525 | is_current_seg_readonly = true; |
| 3526 | } |
| 3527 | |
| 3528 | current_seg->add_output_section_to_load(layout, *p, seg_flags); |
| 3529 | |
| 3530 | if (((*p)->flags() & elfcpp::SHF_WRITE) != 0) |
| 3531 | is_current_seg_readonly = false; |
| 3532 | |
| 3533 | plast = p; |
| 3534 | last_vma = vma; |
| 3535 | last_lma = lma; |
| 3536 | last_size = size; |
| 3537 | } |
| 3538 | |
| 3539 | // An ELF program should work even if the program headers are not in |
| 3540 | // a PT_LOAD segment. However, it appears that the Linux kernel |
| 3541 | // does not set the AT_PHDR auxiliary entry in that case. It sets |
| 3542 | // the load address to p_vaddr - p_offset of the first PT_LOAD |
| 3543 | // segment. It then sets AT_PHDR to the load address plus the |
| 3544 | // offset to the program headers, e_phoff in the file header. This |
| 3545 | // fails when the program headers appear in the file before the |
| 3546 | // first PT_LOAD segment. Therefore, we always create a PT_LOAD |
| 3547 | // segment to hold the file header and the program headers. This is |
| 3548 | // effectively what the GNU linker does, and it is slightly more |
| 3549 | // efficient in any case. We try to use the first PT_LOAD segment |
| 3550 | // if we can, otherwise we make a new one. |
| 3551 | |
| 3552 | if (first_seg == NULL) |
| 3553 | return NULL; |
| 3554 | |
| 3555 | // -n or -N mean that the program is not demand paged and there is |
| 3556 | // no need to put the program headers in a PT_LOAD segment. |
| 3557 | if (parameters->options().nmagic() || parameters->options().omagic()) |
| 3558 | return NULL; |
| 3559 | |
| 3560 | size_t sizeof_headers = this->total_header_size(layout); |
| 3561 | |
| 3562 | uint64_t vma = first_seg->vaddr(); |
| 3563 | uint64_t lma = first_seg->paddr(); |
| 3564 | |
| 3565 | uint64_t subtract = this->header_size_adjustment(lma, sizeof_headers); |
| 3566 | |
| 3567 | if ((lma & (abi_pagesize - 1)) >= sizeof_headers) |
| 3568 | { |
| 3569 | first_seg->set_addresses(vma - subtract, lma - subtract); |
| 3570 | return first_seg; |
| 3571 | } |
| 3572 | |
| 3573 | // If there is no room to squeeze in the headers, then punt. The |
| 3574 | // resulting executable probably won't run on GNU/Linux, but we |
| 3575 | // trust that the user knows what they are doing. |
| 3576 | if (lma < subtract || vma < subtract) |
| 3577 | return NULL; |
| 3578 | |
| 3579 | Output_segment* load_seg = layout->make_output_segment(elfcpp::PT_LOAD, |
| 3580 | elfcpp::PF_R); |
| 3581 | load_seg->set_addresses(vma - subtract, lma - subtract); |
| 3582 | |
| 3583 | return load_seg; |
| 3584 | } |
| 3585 | |
| 3586 | // Create a PT_NOTE segment for each SHT_NOTE section and a PT_TLS |
| 3587 | // segment if there are any SHT_TLS sections. |
| 3588 | |
| 3589 | void |
| 3590 | Script_sections::create_note_and_tls_segments( |
| 3591 | Layout* layout, |
| 3592 | const Layout::Section_list* sections) |
| 3593 | { |
| 3594 | gold_assert(!this->saw_phdrs_clause()); |
| 3595 | |
| 3596 | bool saw_tls = false; |
| 3597 | for (Layout::Section_list::const_iterator p = sections->begin(); |
| 3598 | p != sections->end(); |
| 3599 | ++p) |
| 3600 | { |
| 3601 | if ((*p)->type() == elfcpp::SHT_NOTE) |
| 3602 | { |
| 3603 | elfcpp::Elf_Word seg_flags = |
| 3604 | Layout::section_flags_to_segment((*p)->flags()); |
| 3605 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_NOTE, |
| 3606 | seg_flags); |
| 3607 | oseg->add_output_section_to_nonload(*p, seg_flags); |
| 3608 | |
| 3609 | // Incorporate any subsequent SHT_NOTE sections, in the |
| 3610 | // hopes that the script is sensible. |
| 3611 | Layout::Section_list::const_iterator pnext = p + 1; |
| 3612 | while (pnext != sections->end() |
| 3613 | && (*pnext)->type() == elfcpp::SHT_NOTE) |
| 3614 | { |
| 3615 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); |
| 3616 | oseg->add_output_section_to_nonload(*pnext, seg_flags); |
| 3617 | p = pnext; |
| 3618 | ++pnext; |
| 3619 | } |
| 3620 | } |
| 3621 | |
| 3622 | if (((*p)->flags() & elfcpp::SHF_TLS) != 0) |
| 3623 | { |
| 3624 | if (saw_tls) |
| 3625 | gold_error(_("TLS sections are not adjacent")); |
| 3626 | |
| 3627 | elfcpp::Elf_Word seg_flags = |
| 3628 | Layout::section_flags_to_segment((*p)->flags()); |
| 3629 | Output_segment* oseg = layout->make_output_segment(elfcpp::PT_TLS, |
| 3630 | seg_flags); |
| 3631 | oseg->add_output_section_to_nonload(*p, seg_flags); |
| 3632 | |
| 3633 | Layout::Section_list::const_iterator pnext = p + 1; |
| 3634 | while (pnext != sections->end() |
| 3635 | && ((*pnext)->flags() & elfcpp::SHF_TLS) != 0) |
| 3636 | { |
| 3637 | seg_flags = Layout::section_flags_to_segment((*pnext)->flags()); |
| 3638 | oseg->add_output_section_to_nonload(*pnext, seg_flags); |
| 3639 | p = pnext; |
| 3640 | ++pnext; |
| 3641 | } |
| 3642 | |
| 3643 | saw_tls = true; |
| 3644 | } |
| 3645 | } |
| 3646 | } |
| 3647 | |
| 3648 | // Add a program header. The PHDRS clause is syntactically distinct |
| 3649 | // from the SECTIONS clause, but we implement it with the SECTIONS |
| 3650 | // support because PHDRS is useless if there is no SECTIONS clause. |
| 3651 | |
| 3652 | void |
| 3653 | Script_sections::add_phdr(const char* name, size_t namelen, unsigned int type, |
| 3654 | bool includes_filehdr, bool includes_phdrs, |
| 3655 | bool is_flags_valid, unsigned int flags, |
| 3656 | Expression* load_address) |
| 3657 | { |
| 3658 | if (this->phdrs_elements_ == NULL) |
| 3659 | this->phdrs_elements_ = new Phdrs_elements(); |
| 3660 | this->phdrs_elements_->push_back(new Phdrs_element(name, namelen, type, |
| 3661 | includes_filehdr, |
| 3662 | includes_phdrs, |
| 3663 | is_flags_valid, flags, |
| 3664 | load_address)); |
| 3665 | } |
| 3666 | |
| 3667 | // Return the number of segments we expect to create based on the |
| 3668 | // SECTIONS clause. This is used to implement SIZEOF_HEADERS. |
| 3669 | |
| 3670 | size_t |
| 3671 | Script_sections::expected_segment_count(const Layout* layout) const |
| 3672 | { |
| 3673 | if (this->saw_phdrs_clause()) |
| 3674 | return this->phdrs_elements_->size(); |
| 3675 | |
| 3676 | Layout::Section_list sections; |
| 3677 | layout->get_allocated_sections(§ions); |
| 3678 | |
| 3679 | // We assume that we will need two PT_LOAD segments. |
| 3680 | size_t ret = 2; |
| 3681 | |
| 3682 | bool saw_note = false; |
| 3683 | bool saw_tls = false; |
| 3684 | for (Layout::Section_list::const_iterator p = sections.begin(); |
| 3685 | p != sections.end(); |
| 3686 | ++p) |
| 3687 | { |
| 3688 | if ((*p)->type() == elfcpp::SHT_NOTE) |
| 3689 | { |
| 3690 | // Assume that all note sections will fit into a single |
| 3691 | // PT_NOTE segment. |
| 3692 | if (!saw_note) |
| 3693 | { |
| 3694 | ++ret; |
| 3695 | saw_note = true; |
| 3696 | } |
| 3697 | } |
| 3698 | else if (((*p)->flags() & elfcpp::SHF_TLS) != 0) |
| 3699 | { |
| 3700 | // There can only be one PT_TLS segment. |
| 3701 | if (!saw_tls) |
| 3702 | { |
| 3703 | ++ret; |
| 3704 | saw_tls = true; |
| 3705 | } |
| 3706 | } |
| 3707 | } |
| 3708 | |
| 3709 | return ret; |
| 3710 | } |
| 3711 | |
| 3712 | // Create the segments from a PHDRS clause. Return the segment which |
| 3713 | // should hold the file header and program headers, if any. |
| 3714 | |
| 3715 | Output_segment* |
| 3716 | Script_sections::create_segments_from_phdrs_clause(Layout* layout, |
| 3717 | uint64_t dot_alignment) |
| 3718 | { |
| 3719 | this->attach_sections_using_phdrs_clause(layout); |
| 3720 | return this->set_phdrs_clause_addresses(layout, dot_alignment); |
| 3721 | } |
| 3722 | |
| 3723 | // Create the segments from the PHDRS clause, and put the output |
| 3724 | // sections in them. |
| 3725 | |
| 3726 | void |
| 3727 | Script_sections::attach_sections_using_phdrs_clause(Layout* layout) |
| 3728 | { |
| 3729 | typedef std::map<std::string, Output_segment*> Name_to_segment; |
| 3730 | Name_to_segment name_to_segment; |
| 3731 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); |
| 3732 | p != this->phdrs_elements_->end(); |
| 3733 | ++p) |
| 3734 | name_to_segment[(*p)->name()] = (*p)->create_segment(layout); |
| 3735 | |
| 3736 | // Walk through the output sections and attach them to segments. |
| 3737 | // Output sections in the script which do not list segments are |
| 3738 | // attached to the same set of segments as the immediately preceding |
| 3739 | // output section. |
| 3740 | |
| 3741 | String_list* phdr_names = NULL; |
| 3742 | bool load_segments_only = false; |
| 3743 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); |
| 3744 | p != this->sections_elements_->end(); |
| 3745 | ++p) |
| 3746 | { |
| 3747 | bool orphan; |
| 3748 | String_list* old_phdr_names = phdr_names; |
| 3749 | Output_section* os = (*p)->allocate_to_segment(&phdr_names, &orphan); |
| 3750 | if (os == NULL) |
| 3751 | continue; |
| 3752 | |
| 3753 | if (phdr_names == NULL) |
| 3754 | { |
| 3755 | gold_error(_("allocated section not in any segment")); |
| 3756 | continue; |
| 3757 | } |
| 3758 | |
| 3759 | // We see a list of segments names. Disable PT_LOAD segment only |
| 3760 | // filtering. |
| 3761 | if (old_phdr_names != phdr_names) |
| 3762 | load_segments_only = false; |
| 3763 | |
| 3764 | // If this is an orphan section--one that was not explicitly |
| 3765 | // mentioned in the linker script--then it should not inherit |
| 3766 | // any segment type other than PT_LOAD. Otherwise, e.g., the |
| 3767 | // PT_INTERP segment will pick up following orphan sections, |
| 3768 | // which does not make sense. If this is not an orphan section, |
| 3769 | // we trust the linker script. |
| 3770 | if (orphan) |
| 3771 | { |
| 3772 | // Enable PT_LOAD segments only filtering until we see another |
| 3773 | // list of segment names. |
| 3774 | load_segments_only = true; |
| 3775 | } |
| 3776 | |
| 3777 | bool in_load_segment = false; |
| 3778 | for (String_list::const_iterator q = phdr_names->begin(); |
| 3779 | q != phdr_names->end(); |
| 3780 | ++q) |
| 3781 | { |
| 3782 | Name_to_segment::const_iterator r = name_to_segment.find(*q); |
| 3783 | if (r == name_to_segment.end()) |
| 3784 | gold_error(_("no segment %s"), q->c_str()); |
| 3785 | else |
| 3786 | { |
| 3787 | if (load_segments_only |
| 3788 | && r->second->type() != elfcpp::PT_LOAD) |
| 3789 | continue; |
| 3790 | |
| 3791 | elfcpp::Elf_Word seg_flags = |
| 3792 | Layout::section_flags_to_segment(os->flags()); |
| 3793 | |
| 3794 | if (r->second->type() != elfcpp::PT_LOAD) |
| 3795 | r->second->add_output_section_to_nonload(os, seg_flags); |
| 3796 | else |
| 3797 | { |
| 3798 | r->second->add_output_section_to_load(layout, os, seg_flags); |
| 3799 | if (in_load_segment) |
| 3800 | gold_error(_("section in two PT_LOAD segments")); |
| 3801 | in_load_segment = true; |
| 3802 | } |
| 3803 | } |
| 3804 | } |
| 3805 | |
| 3806 | if (!in_load_segment) |
| 3807 | gold_error(_("allocated section not in any PT_LOAD segment")); |
| 3808 | } |
| 3809 | } |
| 3810 | |
| 3811 | // Set the addresses for segments created from a PHDRS clause. Return |
| 3812 | // the segment which should hold the file header and program headers, |
| 3813 | // if any. |
| 3814 | |
| 3815 | Output_segment* |
| 3816 | Script_sections::set_phdrs_clause_addresses(Layout* layout, |
| 3817 | uint64_t dot_alignment) |
| 3818 | { |
| 3819 | Output_segment* load_seg = NULL; |
| 3820 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); |
| 3821 | p != this->phdrs_elements_->end(); |
| 3822 | ++p) |
| 3823 | { |
| 3824 | // Note that we have to set the flags after adding the output |
| 3825 | // sections to the segment, as adding an output segment can |
| 3826 | // change the flags. |
| 3827 | (*p)->set_flags_if_valid(); |
| 3828 | |
| 3829 | Output_segment* oseg = (*p)->segment(); |
| 3830 | |
| 3831 | if (oseg->type() != elfcpp::PT_LOAD) |
| 3832 | { |
| 3833 | // The addresses of non-PT_LOAD segments are set from the |
| 3834 | // PT_LOAD segments. |
| 3835 | if ((*p)->has_load_address()) |
| 3836 | gold_error(_("may only specify load address for PT_LOAD segment")); |
| 3837 | continue; |
| 3838 | } |
| 3839 | |
| 3840 | oseg->set_minimum_p_align(dot_alignment); |
| 3841 | |
| 3842 | // The output sections should have addresses from the SECTIONS |
| 3843 | // clause. The addresses don't have to be in order, so find the |
| 3844 | // one with the lowest load address. Use that to set the |
| 3845 | // address of the segment. |
| 3846 | |
| 3847 | Output_section* osec = oseg->section_with_lowest_load_address(); |
| 3848 | if (osec == NULL) |
| 3849 | { |
| 3850 | oseg->set_addresses(0, 0); |
| 3851 | continue; |
| 3852 | } |
| 3853 | |
| 3854 | uint64_t vma = osec->address(); |
| 3855 | uint64_t lma = osec->has_load_address() ? osec->load_address() : vma; |
| 3856 | |
| 3857 | // Override the load address of the section with the load |
| 3858 | // address specified for the segment. |
| 3859 | if ((*p)->has_load_address()) |
| 3860 | { |
| 3861 | if (osec->has_load_address()) |
| 3862 | gold_warning(_("PHDRS load address overrides " |
| 3863 | "section %s load address"), |
| 3864 | osec->name()); |
| 3865 | |
| 3866 | lma = (*p)->load_address(); |
| 3867 | } |
| 3868 | |
| 3869 | bool headers = (*p)->includes_filehdr() && (*p)->includes_phdrs(); |
| 3870 | if (!headers && ((*p)->includes_filehdr() || (*p)->includes_phdrs())) |
| 3871 | { |
| 3872 | // We could support this if we wanted to. |
| 3873 | gold_error(_("using only one of FILEHDR and PHDRS is " |
| 3874 | "not currently supported")); |
| 3875 | } |
| 3876 | if (headers) |
| 3877 | { |
| 3878 | size_t sizeof_headers = this->total_header_size(layout); |
| 3879 | uint64_t subtract = this->header_size_adjustment(lma, |
| 3880 | sizeof_headers); |
| 3881 | if (lma >= subtract && vma >= subtract) |
| 3882 | { |
| 3883 | lma -= subtract; |
| 3884 | vma -= subtract; |
| 3885 | } |
| 3886 | else |
| 3887 | { |
| 3888 | gold_error(_("sections loaded on first page without room " |
| 3889 | "for file and program headers " |
| 3890 | "are not supported")); |
| 3891 | } |
| 3892 | |
| 3893 | if (load_seg != NULL) |
| 3894 | gold_error(_("using FILEHDR and PHDRS on more than one " |
| 3895 | "PT_LOAD segment is not currently supported")); |
| 3896 | load_seg = oseg; |
| 3897 | } |
| 3898 | |
| 3899 | oseg->set_addresses(vma, lma); |
| 3900 | } |
| 3901 | |
| 3902 | return load_seg; |
| 3903 | } |
| 3904 | |
| 3905 | // Add the file header and segment headers to non-load segments |
| 3906 | // specified in the PHDRS clause. |
| 3907 | |
| 3908 | void |
| 3909 | Script_sections::put_headers_in_phdrs(Output_data* file_header, |
| 3910 | Output_data* segment_headers) |
| 3911 | { |
| 3912 | gold_assert(this->saw_phdrs_clause()); |
| 3913 | for (Phdrs_elements::iterator p = this->phdrs_elements_->begin(); |
| 3914 | p != this->phdrs_elements_->end(); |
| 3915 | ++p) |
| 3916 | { |
| 3917 | if ((*p)->type() != elfcpp::PT_LOAD) |
| 3918 | { |
| 3919 | if ((*p)->includes_phdrs()) |
| 3920 | (*p)->segment()->add_initial_output_data(segment_headers); |
| 3921 | if ((*p)->includes_filehdr()) |
| 3922 | (*p)->segment()->add_initial_output_data(file_header); |
| 3923 | } |
| 3924 | } |
| 3925 | } |
| 3926 | |
| 3927 | // Look for an output section by name and return the address, the load |
| 3928 | // address, the alignment, and the size. This is used when an |
| 3929 | // expression refers to an output section which was not actually |
| 3930 | // created. This returns true if the section was found, false |
| 3931 | // otherwise. |
| 3932 | |
| 3933 | bool |
| 3934 | Script_sections::get_output_section_info(const char* name, uint64_t* address, |
| 3935 | uint64_t* load_address, |
| 3936 | uint64_t* addralign, |
| 3937 | uint64_t* size) const |
| 3938 | { |
| 3939 | if (!this->saw_sections_clause_) |
| 3940 | return false; |
| 3941 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); |
| 3942 | p != this->sections_elements_->end(); |
| 3943 | ++p) |
| 3944 | if ((*p)->get_output_section_info(name, address, load_address, addralign, |
| 3945 | size)) |
| 3946 | return true; |
| 3947 | return false; |
| 3948 | } |
| 3949 | |
| 3950 | // Release all Output_segments. This remove all pointers to all |
| 3951 | // Output_segments. |
| 3952 | |
| 3953 | void |
| 3954 | Script_sections::release_segments() |
| 3955 | { |
| 3956 | if (this->saw_phdrs_clause()) |
| 3957 | { |
| 3958 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); |
| 3959 | p != this->phdrs_elements_->end(); |
| 3960 | ++p) |
| 3961 | (*p)->release_segment(); |
| 3962 | } |
| 3963 | } |
| 3964 | |
| 3965 | // Print the SECTIONS clause to F for debugging. |
| 3966 | |
| 3967 | void |
| 3968 | Script_sections::print(FILE* f) const |
| 3969 | { |
| 3970 | if (this->phdrs_elements_ != NULL) |
| 3971 | { |
| 3972 | fprintf(f, "PHDRS {\n"); |
| 3973 | for (Phdrs_elements::const_iterator p = this->phdrs_elements_->begin(); |
| 3974 | p != this->phdrs_elements_->end(); |
| 3975 | ++p) |
| 3976 | (*p)->print(f); |
| 3977 | fprintf(f, "}\n"); |
| 3978 | } |
| 3979 | |
| 3980 | if (this->memory_regions_ != NULL) |
| 3981 | { |
| 3982 | fprintf(f, "MEMORY {\n"); |
| 3983 | for (Memory_regions::const_iterator m = this->memory_regions_->begin(); |
| 3984 | m != this->memory_regions_->end(); |
| 3985 | ++m) |
| 3986 | (*m)->print(f); |
| 3987 | fprintf(f, "}\n"); |
| 3988 | } |
| 3989 | |
| 3990 | if (!this->saw_sections_clause_) |
| 3991 | return; |
| 3992 | |
| 3993 | fprintf(f, "SECTIONS {\n"); |
| 3994 | |
| 3995 | for (Sections_elements::const_iterator p = this->sections_elements_->begin(); |
| 3996 | p != this->sections_elements_->end(); |
| 3997 | ++p) |
| 3998 | (*p)->print(f); |
| 3999 | |
| 4000 | fprintf(f, "}\n"); |
| 4001 | } |
| 4002 | |
| 4003 | } // End namespace gold. |