| 1 | // reloc.h -- relocate input files for gold -*- C++ -*- |
| 2 | |
| 3 | // Copyright (C) 2006-2020 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #ifndef GOLD_RELOC_H |
| 24 | #define GOLD_RELOC_H |
| 25 | |
| 26 | #include <vector> |
| 27 | #ifdef HAVE_BYTESWAP_H |
| 28 | #include <byteswap.h> |
| 29 | #endif |
| 30 | |
| 31 | #include "elfcpp.h" |
| 32 | #include "workqueue.h" |
| 33 | |
| 34 | namespace gold |
| 35 | { |
| 36 | |
| 37 | class General_options; |
| 38 | class Object; |
| 39 | class Relobj; |
| 40 | struct Read_relocs_data; |
| 41 | class Symbol; |
| 42 | class Layout; |
| 43 | class Output_data; |
| 44 | class Output_section; |
| 45 | |
| 46 | template<int size> |
| 47 | class Sized_symbol; |
| 48 | |
| 49 | template<int size, bool big_endian> |
| 50 | class Sized_relobj_file; |
| 51 | |
| 52 | template<int size> |
| 53 | class Symbol_value; |
| 54 | |
| 55 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 56 | class Output_data_reloc; |
| 57 | |
| 58 | // A class to read the relocations for an object file, and then queue |
| 59 | // up a task to see if they require any GOT/PLT/COPY relocations in |
| 60 | // the symbol table. |
| 61 | |
| 62 | class Read_relocs : public Task |
| 63 | { |
| 64 | public: |
| 65 | // THIS_BLOCKER and NEXT_BLOCKER are passed along to a Scan_relocs |
| 66 | // or Gc_process_relocs task, so that they run in a deterministic |
| 67 | // order. |
| 68 | Read_relocs(Symbol_table* symtab, Layout* layout, Relobj* object, |
| 69 | Task_token* this_blocker, Task_token* next_blocker) |
| 70 | : symtab_(symtab), layout_(layout), object_(object), |
| 71 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 72 | { } |
| 73 | |
| 74 | // The standard Task methods. |
| 75 | |
| 76 | Task_token* |
| 77 | is_runnable(); |
| 78 | |
| 79 | void |
| 80 | locks(Task_locker*); |
| 81 | |
| 82 | void |
| 83 | run(Workqueue*); |
| 84 | |
| 85 | std::string |
| 86 | get_name() const; |
| 87 | |
| 88 | private: |
| 89 | Symbol_table* symtab_; |
| 90 | Layout* layout_; |
| 91 | Relobj* object_; |
| 92 | Task_token* this_blocker_; |
| 93 | Task_token* next_blocker_; |
| 94 | }; |
| 95 | |
| 96 | // Process the relocs to figure out which sections are garbage. |
| 97 | // Very similar to scan relocs. |
| 98 | |
| 99 | class Gc_process_relocs : public Task |
| 100 | { |
| 101 | public: |
| 102 | // THIS_BLOCKER prevents this task from running until the previous |
| 103 | // one is finished. NEXT_BLOCKER prevents the next task from |
| 104 | // running. |
| 105 | Gc_process_relocs(Symbol_table* symtab, Layout* layout, Relobj* object, |
| 106 | Read_relocs_data* rd, Task_token* this_blocker, |
| 107 | Task_token* next_blocker) |
| 108 | : symtab_(symtab), layout_(layout), object_(object), rd_(rd), |
| 109 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 110 | { } |
| 111 | |
| 112 | ~Gc_process_relocs(); |
| 113 | |
| 114 | // The standard Task methods. |
| 115 | |
| 116 | Task_token* |
| 117 | is_runnable(); |
| 118 | |
| 119 | void |
| 120 | locks(Task_locker*); |
| 121 | |
| 122 | void |
| 123 | run(Workqueue*); |
| 124 | |
| 125 | std::string |
| 126 | get_name() const; |
| 127 | |
| 128 | private: |
| 129 | Symbol_table* symtab_; |
| 130 | Layout* layout_; |
| 131 | Relobj* object_; |
| 132 | Read_relocs_data* rd_; |
| 133 | Task_token* this_blocker_; |
| 134 | Task_token* next_blocker_; |
| 135 | }; |
| 136 | |
| 137 | // Scan the relocations for an object to see if they require any |
| 138 | // GOT/PLT/COPY relocations. |
| 139 | |
| 140 | class Scan_relocs : public Task |
| 141 | { |
| 142 | public: |
| 143 | // THIS_BLOCKER prevents this task from running until the previous |
| 144 | // one is finished. NEXT_BLOCKER prevents the next task from |
| 145 | // running. |
| 146 | Scan_relocs(Symbol_table* symtab, Layout* layout, Relobj* object, |
| 147 | Read_relocs_data* rd, Task_token* this_blocker, |
| 148 | Task_token* next_blocker) |
| 149 | : symtab_(symtab), layout_(layout), object_(object), rd_(rd), |
| 150 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
| 151 | { } |
| 152 | |
| 153 | ~Scan_relocs(); |
| 154 | |
| 155 | // The standard Task methods. |
| 156 | |
| 157 | Task_token* |
| 158 | is_runnable(); |
| 159 | |
| 160 | void |
| 161 | locks(Task_locker*); |
| 162 | |
| 163 | void |
| 164 | run(Workqueue*); |
| 165 | |
| 166 | std::string |
| 167 | get_name() const; |
| 168 | |
| 169 | private: |
| 170 | Symbol_table* symtab_; |
| 171 | Layout* layout_; |
| 172 | Relobj* object_; |
| 173 | Read_relocs_data* rd_; |
| 174 | Task_token* this_blocker_; |
| 175 | Task_token* next_blocker_; |
| 176 | }; |
| 177 | |
| 178 | // A class to perform all the relocations for an object file. |
| 179 | |
| 180 | class Relocate_task : public Task |
| 181 | { |
| 182 | public: |
| 183 | Relocate_task(const Symbol_table* symtab, const Layout* layout, |
| 184 | Relobj* object, Output_file* of, |
| 185 | Task_token* input_sections_blocker, |
| 186 | Task_token* output_sections_blocker, Task_token* final_blocker) |
| 187 | : symtab_(symtab), layout_(layout), object_(object), of_(of), |
| 188 | input_sections_blocker_(input_sections_blocker), |
| 189 | output_sections_blocker_(output_sections_blocker), |
| 190 | final_blocker_(final_blocker) |
| 191 | { } |
| 192 | |
| 193 | // The standard Task methods. |
| 194 | |
| 195 | Task_token* |
| 196 | is_runnable(); |
| 197 | |
| 198 | void |
| 199 | locks(Task_locker*); |
| 200 | |
| 201 | void |
| 202 | run(Workqueue*); |
| 203 | |
| 204 | std::string |
| 205 | get_name() const; |
| 206 | |
| 207 | private: |
| 208 | const Symbol_table* symtab_; |
| 209 | const Layout* layout_; |
| 210 | Relobj* object_; |
| 211 | Output_file* of_; |
| 212 | Task_token* input_sections_blocker_; |
| 213 | Task_token* output_sections_blocker_; |
| 214 | Task_token* final_blocker_; |
| 215 | }; |
| 216 | |
| 217 | // During a relocatable link, this class records how relocations |
| 218 | // should be handled for a single input reloc section. An instance of |
| 219 | // this class is created while scanning relocs, and it is used while |
| 220 | // processing relocs. |
| 221 | |
| 222 | class Relocatable_relocs |
| 223 | { |
| 224 | public: |
| 225 | // We use a vector of unsigned char to indicate how the input relocs |
| 226 | // should be handled. Each element is one of the following values. |
| 227 | // We create this vector when we initially scan the relocations. |
| 228 | enum Reloc_strategy |
| 229 | { |
| 230 | // Copy the input reloc. Don't modify it other than updating the |
| 231 | // r_offset field and the r_sym part of the r_info field. |
| 232 | RELOC_COPY, |
| 233 | // Copy the input reloc which is against an STT_SECTION symbol. |
| 234 | // Update the r_offset and r_sym part of the r_info field. Adjust |
| 235 | // the addend by subtracting the value of the old local symbol and |
| 236 | // adding the value of the new local symbol. The addend is in the |
| 237 | // SHT_RELA reloc and the contents of the data section do not need |
| 238 | // to be changed. |
| 239 | RELOC_ADJUST_FOR_SECTION_RELA, |
| 240 | // Like RELOC_ADJUST_FOR_SECTION_RELA but the addend should not be |
| 241 | // adjusted. |
| 242 | RELOC_ADJUST_FOR_SECTION_0, |
| 243 | // Like RELOC_ADJUST_FOR_SECTION_RELA but the contents of the |
| 244 | // section need to be changed. The number indicates the number of |
| 245 | // bytes in the addend in the section contents. |
| 246 | RELOC_ADJUST_FOR_SECTION_1, |
| 247 | RELOC_ADJUST_FOR_SECTION_2, |
| 248 | RELOC_ADJUST_FOR_SECTION_4, |
| 249 | RELOC_ADJUST_FOR_SECTION_8, |
| 250 | // Like RELOC_ADJUST_FOR_SECTION_4 but for unaligned relocs. |
| 251 | RELOC_ADJUST_FOR_SECTION_4_UNALIGNED, |
| 252 | // Discard the input reloc--process it completely when relocating |
| 253 | // the data section contents. |
| 254 | RELOC_DISCARD, |
| 255 | // An input reloc which is not discarded, but which requires |
| 256 | // target specific processing in order to update it. |
| 257 | RELOC_SPECIAL |
| 258 | }; |
| 259 | |
| 260 | Relocatable_relocs() |
| 261 | : reloc_strategies_(), output_reloc_count_(0), posd_(NULL) |
| 262 | { } |
| 263 | |
| 264 | // Record the number of relocs. |
| 265 | void |
| 266 | set_reloc_count(size_t reloc_count) |
| 267 | { this->reloc_strategies_.reserve(reloc_count); } |
| 268 | |
| 269 | // Record what to do for the next reloc. |
| 270 | void |
| 271 | set_next_reloc_strategy(Reloc_strategy strategy) |
| 272 | { |
| 273 | this->reloc_strategies_.push_back(static_cast<unsigned char>(strategy)); |
| 274 | if (strategy != RELOC_DISCARD) |
| 275 | ++this->output_reloc_count_; |
| 276 | } |
| 277 | |
| 278 | // Record the Output_data associated with this reloc section. |
| 279 | void |
| 280 | set_output_data(Output_data* posd) |
| 281 | { |
| 282 | gold_assert(this->posd_ == NULL); |
| 283 | this->posd_ = posd; |
| 284 | } |
| 285 | |
| 286 | // Return the Output_data associated with this reloc section. |
| 287 | Output_data* |
| 288 | output_data() const |
| 289 | { return this->posd_; } |
| 290 | |
| 291 | // Return what to do for reloc I. |
| 292 | Reloc_strategy |
| 293 | strategy(unsigned int i) const |
| 294 | { |
| 295 | gold_assert(i < this->reloc_strategies_.size()); |
| 296 | return static_cast<Reloc_strategy>(this->reloc_strategies_[i]); |
| 297 | } |
| 298 | |
| 299 | // Set the strategy for reloc I. |
| 300 | void |
| 301 | set_strategy(unsigned int i, Reloc_strategy strategy) |
| 302 | { |
| 303 | gold_assert(i < this->reloc_strategies_.size()); |
| 304 | this->reloc_strategies_[i] = strategy; |
| 305 | } |
| 306 | |
| 307 | // Return the number of relocations to create in the output file. |
| 308 | size_t |
| 309 | output_reloc_count() const |
| 310 | { return this->output_reloc_count_; } |
| 311 | |
| 312 | private: |
| 313 | typedef std::vector<unsigned char> Reloc_strategies; |
| 314 | |
| 315 | // The strategies for the input reloc. There is one entry in this |
| 316 | // vector for each relocation in the input section. |
| 317 | Reloc_strategies reloc_strategies_; |
| 318 | // The number of relocations to be created in the output file. |
| 319 | size_t output_reloc_count_; |
| 320 | // The output data structure associated with this relocation. |
| 321 | Output_data* posd_; |
| 322 | }; |
| 323 | |
| 324 | template<int valsize> |
| 325 | class Bits; |
| 326 | |
| 327 | // Standard relocation routines which are used on many targets. Here |
| 328 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. |
| 329 | |
| 330 | template<int size, bool big_endian> |
| 331 | class Relocate_functions |
| 332 | { |
| 333 | public: |
| 334 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 335 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword Addendtype; |
| 336 | |
| 337 | enum Overflow_check |
| 338 | { |
| 339 | // No overflow checking. |
| 340 | CHECK_NONE, |
| 341 | // Check for overflow of a signed value. |
| 342 | CHECK_SIGNED, |
| 343 | // Check for overflow of an unsigned value. |
| 344 | CHECK_UNSIGNED, |
| 345 | // Check for overflow of a signed or unsigned value. |
| 346 | // (i.e., no error if either signed or unsigned fits.) |
| 347 | CHECK_SIGNED_OR_UNSIGNED |
| 348 | }; |
| 349 | |
| 350 | enum Reloc_status |
| 351 | { |
| 352 | RELOC_OK, |
| 353 | RELOC_OVERFLOW |
| 354 | }; |
| 355 | |
| 356 | private: |
| 357 | // Check for overflow. |
| 358 | template<int valsize> |
| 359 | static inline Reloc_status |
| 360 | check_overflow(Address value, Overflow_check check) |
| 361 | { |
| 362 | switch (check) |
| 363 | { |
| 364 | case CHECK_SIGNED: |
| 365 | if (size == 32) |
| 366 | return (Bits<valsize>::has_overflow32(value) |
| 367 | ? RELOC_OVERFLOW |
| 368 | : RELOC_OK); |
| 369 | else |
| 370 | return (Bits<valsize>::has_overflow(value) |
| 371 | ? RELOC_OVERFLOW |
| 372 | : RELOC_OK); |
| 373 | case CHECK_UNSIGNED: |
| 374 | if (size == 32) |
| 375 | return (Bits<valsize>::has_unsigned_overflow32(value) |
| 376 | ? RELOC_OVERFLOW |
| 377 | : RELOC_OK); |
| 378 | else |
| 379 | return (Bits<valsize>::has_unsigned_overflow(value) |
| 380 | ? RELOC_OVERFLOW |
| 381 | : RELOC_OK); |
| 382 | case CHECK_SIGNED_OR_UNSIGNED: |
| 383 | if (size == 32) |
| 384 | return (Bits<valsize>::has_signed_unsigned_overflow32(value) |
| 385 | ? RELOC_OVERFLOW |
| 386 | : RELOC_OK); |
| 387 | else |
| 388 | return (Bits<valsize>::has_signed_unsigned_overflow64(value) |
| 389 | ? RELOC_OVERFLOW |
| 390 | : RELOC_OK); |
| 391 | case CHECK_NONE: |
| 392 | default: |
| 393 | return RELOC_OK; |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | // Do a simple relocation with the addend in the section contents. |
| 398 | // VALSIZE is the size of the value. |
| 399 | template<int valsize> |
| 400 | static inline Reloc_status |
| 401 | rel(unsigned char* view, Address value, Overflow_check check) |
| 402 | { |
| 403 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 404 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 405 | Valtype addend = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 406 | value += addend; |
| 407 | elfcpp::Swap<valsize, big_endian>:: |
| 408 | writeval(wv, static_cast<Valtype>(value)); |
| 409 | return check_overflow<valsize>(value, check); |
| 410 | } |
| 411 | |
| 412 | // Like the above but for relocs at unaligned addresses. |
| 413 | template<int valsize> |
| 414 | static inline Reloc_status |
| 415 | rel_unaligned(unsigned char* view, Address value, Overflow_check check) |
| 416 | { |
| 417 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| 418 | Valtype; |
| 419 | Valtype addend = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); |
| 420 | value += addend; |
| 421 | elfcpp::Swap_unaligned<valsize, big_endian>:: |
| 422 | writeval(view, static_cast<Valtype>(value)); |
| 423 | return check_overflow<valsize>(value, check); |
| 424 | } |
| 425 | |
| 426 | // Do a simple relocation using a Symbol_value with the addend in |
| 427 | // the section contents. VALSIZE is the size of the value to |
| 428 | // relocate. |
| 429 | template<int valsize> |
| 430 | static inline Reloc_status |
| 431 | rel(unsigned char* view, |
| 432 | const Sized_relobj_file<size, big_endian>* object, |
| 433 | const Symbol_value<size>* psymval, |
| 434 | Overflow_check check) |
| 435 | { |
| 436 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 437 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 438 | Valtype addend = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 439 | Address value = psymval->value(object, addend); |
| 440 | elfcpp::Swap<valsize, big_endian>:: |
| 441 | writeval(wv, static_cast<Valtype>(value)); |
| 442 | return check_overflow<valsize>(value, check); |
| 443 | } |
| 444 | |
| 445 | // Like the above but for relocs at unaligned addresses. |
| 446 | template<int valsize> |
| 447 | static inline Reloc_status |
| 448 | rel_unaligned(unsigned char* view, |
| 449 | const Sized_relobj_file<size, big_endian>* object, |
| 450 | const Symbol_value<size>* psymval, |
| 451 | Overflow_check check) |
| 452 | { |
| 453 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| 454 | Valtype; |
| 455 | Valtype addend = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); |
| 456 | Address value = psymval->value(object, addend); |
| 457 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, value); |
| 458 | return check_overflow<valsize>(value, check); |
| 459 | } |
| 460 | |
| 461 | // Do a simple relocation with the addend in the relocation. |
| 462 | // VALSIZE is the size of the value. |
| 463 | template<int valsize> |
| 464 | static inline Reloc_status |
| 465 | rela(unsigned char* view, Address value, Addendtype addend, |
| 466 | Overflow_check check) |
| 467 | { |
| 468 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 469 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 470 | value += addend; |
| 471 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value); |
| 472 | return check_overflow<valsize>(value, check); |
| 473 | } |
| 474 | |
| 475 | // Do a simple relocation using a symbol value with the addend in |
| 476 | // the relocation. VALSIZE is the size of the value. |
| 477 | template<int valsize> |
| 478 | static inline Reloc_status |
| 479 | rela(unsigned char* view, |
| 480 | const Sized_relobj_file<size, big_endian>* object, |
| 481 | const Symbol_value<size>* psymval, |
| 482 | Addendtype addend, |
| 483 | Overflow_check check) |
| 484 | { |
| 485 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 486 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 487 | Address value = psymval->value(object, addend); |
| 488 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value); |
| 489 | return check_overflow<valsize>(value, check); |
| 490 | } |
| 491 | |
| 492 | // Do a simple PC relative relocation with the addend in the section |
| 493 | // contents. VALSIZE is the size of the value. |
| 494 | template<int valsize> |
| 495 | static inline Reloc_status |
| 496 | pcrel(unsigned char* view, Address value, Address address, |
| 497 | Overflow_check check) |
| 498 | { |
| 499 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 500 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 501 | Valtype addend = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 502 | value = value + addend - address; |
| 503 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value); |
| 504 | return check_overflow<valsize>(value, check); |
| 505 | } |
| 506 | |
| 507 | // Like the above but for relocs at unaligned addresses. |
| 508 | template<int valsize> |
| 509 | static inline Reloc_status |
| 510 | pcrel_unaligned(unsigned char* view, Address value, Address address, |
| 511 | Overflow_check check) |
| 512 | { |
| 513 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 514 | Valtype addend = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); |
| 515 | value = value + addend - address; |
| 516 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, value); |
| 517 | return check_overflow<valsize>(value, check); |
| 518 | } |
| 519 | |
| 520 | // Do a simple PC relative relocation with a Symbol_value with the |
| 521 | // addend in the section contents. VALSIZE is the size of the |
| 522 | // value. |
| 523 | template<int valsize> |
| 524 | static inline Reloc_status |
| 525 | pcrel(unsigned char* view, |
| 526 | const Sized_relobj_file<size, big_endian>* object, |
| 527 | const Symbol_value<size>* psymval, |
| 528 | Address address, |
| 529 | Overflow_check check) |
| 530 | { |
| 531 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 532 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 533 | Valtype addend = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 534 | Address value = psymval->value(object, addend) - address; |
| 535 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value); |
| 536 | return check_overflow<valsize>(value, check); |
| 537 | } |
| 538 | |
| 539 | // Do a simple PC relative relocation with the addend in the |
| 540 | // relocation. VALSIZE is the size of the value. |
| 541 | template<int valsize> |
| 542 | static inline Reloc_status |
| 543 | pcrela(unsigned char* view, Address value, Addendtype addend, Address address, |
| 544 | Overflow_check check) |
| 545 | { |
| 546 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 547 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 548 | value = value + addend - address; |
| 549 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value); |
| 550 | return check_overflow<valsize>(value, check); |
| 551 | } |
| 552 | |
| 553 | // Do a simple PC relative relocation with a Symbol_value with the |
| 554 | // addend in the relocation. VALSIZE is the size of the value. |
| 555 | template<int valsize> |
| 556 | static inline Reloc_status |
| 557 | pcrela(unsigned char* view, |
| 558 | const Sized_relobj_file<size, big_endian>* object, |
| 559 | const Symbol_value<size>* psymval, |
| 560 | Addendtype addend, |
| 561 | Address address, |
| 562 | Overflow_check check) |
| 563 | { |
| 564 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 565 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 566 | Address value = psymval->value(object, addend) - address; |
| 567 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value); |
| 568 | return check_overflow<valsize>(value, check); |
| 569 | } |
| 570 | |
| 571 | typedef Relocate_functions<size, big_endian> This; |
| 572 | |
| 573 | public: |
| 574 | // Do a simple 8-bit REL relocation with the addend in the section |
| 575 | // contents. |
| 576 | static inline void |
| 577 | rel8(unsigned char* view, Address value) |
| 578 | { This::template rel<8>(view, value, CHECK_NONE); } |
| 579 | |
| 580 | static inline Reloc_status |
| 581 | rel8_check(unsigned char* view, Address value, Overflow_check check) |
| 582 | { return This::template rel<8>(view, value, check); } |
| 583 | |
| 584 | static inline void |
| 585 | rel8(unsigned char* view, |
| 586 | const Sized_relobj_file<size, big_endian>* object, |
| 587 | const Symbol_value<size>* psymval) |
| 588 | { This::template rel<8>(view, object, psymval, CHECK_NONE); } |
| 589 | |
| 590 | static inline Reloc_status |
| 591 | rel8_check(unsigned char* view, |
| 592 | const Sized_relobj_file<size, big_endian>* object, |
| 593 | const Symbol_value<size>* psymval, |
| 594 | Overflow_check check) |
| 595 | { return This::template rel<8>(view, object, psymval, check); } |
| 596 | |
| 597 | // Do an 8-bit RELA relocation with the addend in the relocation. |
| 598 | static inline void |
| 599 | rela8(unsigned char* view, Address value, Addendtype addend) |
| 600 | { This::template rela<8>(view, value, addend, CHECK_NONE); } |
| 601 | |
| 602 | static inline Reloc_status |
| 603 | rela8_check(unsigned char* view, Address value, Addendtype addend, |
| 604 | Overflow_check check) |
| 605 | { return This::template rela<8>(view, value, addend, check); } |
| 606 | |
| 607 | static inline void |
| 608 | rela8(unsigned char* view, |
| 609 | const Sized_relobj_file<size, big_endian>* object, |
| 610 | const Symbol_value<size>* psymval, |
| 611 | Addendtype addend) |
| 612 | { This::template rela<8>(view, object, psymval, addend, CHECK_NONE); } |
| 613 | |
| 614 | static inline Reloc_status |
| 615 | rela8_check(unsigned char* view, |
| 616 | const Sized_relobj_file<size, big_endian>* object, |
| 617 | const Symbol_value<size>* psymval, |
| 618 | Addendtype addend, |
| 619 | Overflow_check check) |
| 620 | { return This::template rela<8>(view, object, psymval, addend, check); } |
| 621 | |
| 622 | // Do a simple 8-bit PC relative relocation with the addend in the |
| 623 | // section contents. |
| 624 | static inline void |
| 625 | pcrel8(unsigned char* view, unsigned char value, Address address) |
| 626 | { This::template pcrel<8>(view, value, address, CHECK_NONE); } |
| 627 | |
| 628 | static inline Reloc_status |
| 629 | pcrel8_check(unsigned char* view, unsigned char value, Address address, |
| 630 | Overflow_check check) |
| 631 | { return This::template pcrel<8>(view, value, address, check); } |
| 632 | |
| 633 | static inline void |
| 634 | pcrel8(unsigned char* view, |
| 635 | const Sized_relobj_file<size, big_endian>* object, |
| 636 | const Symbol_value<size>* psymval, |
| 637 | Address address) |
| 638 | { This::template pcrel<8>(view, object, psymval, address, CHECK_NONE); } |
| 639 | |
| 640 | static inline Reloc_status |
| 641 | pcrel8_check(unsigned char* view, |
| 642 | const Sized_relobj_file<size, big_endian>* object, |
| 643 | const Symbol_value<size>* psymval, |
| 644 | Address address, |
| 645 | Overflow_check check) |
| 646 | { return This::template pcrel<8>(view, object, psymval, address, check); } |
| 647 | |
| 648 | // Do a simple 8-bit PC relative RELA relocation with the addend in |
| 649 | // the reloc. |
| 650 | static inline void |
| 651 | pcrela8(unsigned char* view, Address value, Addendtype addend, |
| 652 | Address address) |
| 653 | { This::template pcrela<8>(view, value, addend, address, CHECK_NONE); } |
| 654 | |
| 655 | static inline Reloc_status |
| 656 | pcrela8_check(unsigned char* view, Address value, Addendtype addend, |
| 657 | Address address, Overflow_check check) |
| 658 | { return This::template pcrela<8>(view, value, addend, address, check); } |
| 659 | |
| 660 | static inline void |
| 661 | pcrela8(unsigned char* view, |
| 662 | const Sized_relobj_file<size, big_endian>* object, |
| 663 | const Symbol_value<size>* psymval, |
| 664 | Addendtype addend, |
| 665 | Address address) |
| 666 | { This::template pcrela<8>(view, object, psymval, addend, address, |
| 667 | CHECK_NONE); } |
| 668 | |
| 669 | static inline Reloc_status |
| 670 | pcrela8_check(unsigned char* view, |
| 671 | const Sized_relobj_file<size, big_endian>* object, |
| 672 | const Symbol_value<size>* psymval, |
| 673 | Addendtype addend, |
| 674 | Address address, |
| 675 | Overflow_check check) |
| 676 | { return This::template pcrela<8>(view, object, psymval, addend, address, |
| 677 | check); } |
| 678 | |
| 679 | // Do a simple 16-bit REL relocation with the addend in the section |
| 680 | // contents. |
| 681 | static inline void |
| 682 | rel16(unsigned char* view, Address value) |
| 683 | { This::template rel<16>(view, value, CHECK_NONE); } |
| 684 | |
| 685 | static inline Reloc_status |
| 686 | rel16_check(unsigned char* view, Address value, Overflow_check check) |
| 687 | { return This::template rel<16>(view, value, check); } |
| 688 | |
| 689 | static inline void |
| 690 | rel16(unsigned char* view, |
| 691 | const Sized_relobj_file<size, big_endian>* object, |
| 692 | const Symbol_value<size>* psymval) |
| 693 | { This::template rel<16>(view, object, psymval, CHECK_NONE); } |
| 694 | |
| 695 | static inline Reloc_status |
| 696 | rel16_check(unsigned char* view, |
| 697 | const Sized_relobj_file<size, big_endian>* object, |
| 698 | const Symbol_value<size>* psymval, |
| 699 | Overflow_check check) |
| 700 | { return This::template rel<16>(view, object, psymval, check); } |
| 701 | |
| 702 | // Do an 16-bit RELA relocation with the addend in the relocation. |
| 703 | static inline void |
| 704 | rela16(unsigned char* view, Address value, Addendtype addend) |
| 705 | { This::template rela<16>(view, value, addend, CHECK_NONE); } |
| 706 | |
| 707 | static inline Reloc_status |
| 708 | rela16_check(unsigned char* view, Address value, Addendtype addend, |
| 709 | Overflow_check check) |
| 710 | { return This::template rela<16>(view, value, addend, check); } |
| 711 | |
| 712 | static inline void |
| 713 | rela16(unsigned char* view, |
| 714 | const Sized_relobj_file<size, big_endian>* object, |
| 715 | const Symbol_value<size>* psymval, |
| 716 | Addendtype addend) |
| 717 | { This::template rela<16>(view, object, psymval, addend, CHECK_NONE); } |
| 718 | |
| 719 | static inline Reloc_status |
| 720 | rela16_check(unsigned char* view, |
| 721 | const Sized_relobj_file<size, big_endian>* object, |
| 722 | const Symbol_value<size>* psymval, |
| 723 | Addendtype addend, |
| 724 | Overflow_check check) |
| 725 | { return This::template rela<16>(view, object, psymval, addend, check); } |
| 726 | |
| 727 | // Do a simple 16-bit PC relative REL relocation with the addend in |
| 728 | // the section contents. |
| 729 | static inline void |
| 730 | pcrel16(unsigned char* view, Address value, Address address) |
| 731 | { This::template pcrel<16>(view, value, address, CHECK_NONE); } |
| 732 | |
| 733 | static inline Reloc_status |
| 734 | pcrel16_check(unsigned char* view, Address value, Address address, |
| 735 | Overflow_check check) |
| 736 | { return This::template pcrel<16>(view, value, address, check); } |
| 737 | |
| 738 | static inline void |
| 739 | pcrel16(unsigned char* view, |
| 740 | const Sized_relobj_file<size, big_endian>* object, |
| 741 | const Symbol_value<size>* psymval, |
| 742 | Address address) |
| 743 | { This::template pcrel<16>(view, object, psymval, address, CHECK_NONE); } |
| 744 | |
| 745 | static inline Reloc_status |
| 746 | pcrel16_check(unsigned char* view, |
| 747 | const Sized_relobj_file<size, big_endian>* object, |
| 748 | const Symbol_value<size>* psymval, |
| 749 | Address address, |
| 750 | Overflow_check check) |
| 751 | { return This::template pcrel<16>(view, object, psymval, address, check); } |
| 752 | |
| 753 | // Do a simple 16-bit PC relative RELA relocation with the addend in |
| 754 | // the reloc. |
| 755 | static inline void |
| 756 | pcrela16(unsigned char* view, Address value, Addendtype addend, |
| 757 | Address address) |
| 758 | { This::template pcrela<16>(view, value, addend, address, CHECK_NONE); } |
| 759 | |
| 760 | static inline Reloc_status |
| 761 | pcrela16_check(unsigned char* view, Address value, Addendtype addend, |
| 762 | Address address, Overflow_check check) |
| 763 | { return This::template pcrela<16>(view, value, addend, address, check); } |
| 764 | |
| 765 | static inline void |
| 766 | pcrela16(unsigned char* view, |
| 767 | const Sized_relobj_file<size, big_endian>* object, |
| 768 | const Symbol_value<size>* psymval, |
| 769 | Addendtype addend, |
| 770 | Address address) |
| 771 | { This::template pcrela<16>(view, object, psymval, addend, address, |
| 772 | CHECK_NONE); } |
| 773 | |
| 774 | static inline Reloc_status |
| 775 | pcrela16_check(unsigned char* view, |
| 776 | const Sized_relobj_file<size, big_endian>* object, |
| 777 | const Symbol_value<size>* psymval, |
| 778 | Addendtype addend, |
| 779 | Address address, |
| 780 | Overflow_check check) |
| 781 | { return This::template pcrela<16>(view, object, psymval, addend, address, |
| 782 | check); } |
| 783 | |
| 784 | // Do a simple 32-bit REL relocation with the addend in the section |
| 785 | // contents. |
| 786 | static inline void |
| 787 | rel32(unsigned char* view, Address value) |
| 788 | { This::template rel<32>(view, value, CHECK_NONE); } |
| 789 | |
| 790 | static inline Reloc_status |
| 791 | rel32_check(unsigned char* view, Address value, Overflow_check check) |
| 792 | { return This::template rel<32>(view, value, check); } |
| 793 | |
| 794 | // Like above but for relocs at unaligned addresses. |
| 795 | static inline void |
| 796 | rel32_unaligned(unsigned char* view, Address value) |
| 797 | { This::template rel_unaligned<32>(view, value, CHECK_NONE); } |
| 798 | |
| 799 | static inline Reloc_status |
| 800 | rel32_unaligned_check(unsigned char* view, Address value, |
| 801 | Overflow_check check) |
| 802 | { return This::template rel_unaligned<32>(view, value, check); } |
| 803 | |
| 804 | static inline void |
| 805 | rel32(unsigned char* view, |
| 806 | const Sized_relobj_file<size, big_endian>* object, |
| 807 | const Symbol_value<size>* psymval) |
| 808 | { This::template rel<32>(view, object, psymval, CHECK_NONE); } |
| 809 | |
| 810 | static inline Reloc_status |
| 811 | rel32_check(unsigned char* view, |
| 812 | const Sized_relobj_file<size, big_endian>* object, |
| 813 | const Symbol_value<size>* psymval, |
| 814 | Overflow_check check) |
| 815 | { return This::template rel<32>(view, object, psymval, check); } |
| 816 | |
| 817 | // Like above but for relocs at unaligned addresses. |
| 818 | static inline void |
| 819 | rel32_unaligned(unsigned char* view, |
| 820 | const Sized_relobj_file<size, big_endian>* object, |
| 821 | const Symbol_value<size>* psymval) |
| 822 | { This::template rel_unaligned<32>(view, object, psymval, CHECK_NONE); } |
| 823 | |
| 824 | static inline Reloc_status |
| 825 | rel32_unaligned_check(unsigned char* view, |
| 826 | const Sized_relobj_file<size, big_endian>* object, |
| 827 | const Symbol_value<size>* psymval, |
| 828 | Overflow_check check) |
| 829 | { return This::template rel_unaligned<32>(view, object, psymval, check); } |
| 830 | |
| 831 | // Do a 32-bit RELA relocation with the addend in the relocation. |
| 832 | static inline void |
| 833 | rela32(unsigned char* view, Address value, Addendtype addend) |
| 834 | { This::template rela<32>(view, value, addend, CHECK_NONE); } |
| 835 | |
| 836 | static inline Reloc_status |
| 837 | rela32(unsigned char* view, Address value, Addendtype addend, |
| 838 | Overflow_check check) |
| 839 | { return This::template rela<32>(view, value, addend, check); } |
| 840 | |
| 841 | static inline void |
| 842 | rela32(unsigned char* view, |
| 843 | const Sized_relobj_file<size, big_endian>* object, |
| 844 | const Symbol_value<size>* psymval, |
| 845 | Addendtype addend) |
| 846 | { This::template rela<32>(view, object, psymval, addend, CHECK_NONE); } |
| 847 | |
| 848 | static inline Reloc_status |
| 849 | rela32_check(unsigned char* view, |
| 850 | const Sized_relobj_file<size, big_endian>* object, |
| 851 | const Symbol_value<size>* psymval, |
| 852 | Addendtype addend, |
| 853 | Overflow_check check) |
| 854 | { return This::template rela<32>(view, object, psymval, addend, check); } |
| 855 | |
| 856 | // Do a simple 32-bit PC relative REL relocation with the addend in |
| 857 | // the section contents. |
| 858 | static inline void |
| 859 | pcrel32(unsigned char* view, Address value, Address address) |
| 860 | { This::template pcrel<32>(view, value, address, CHECK_NONE); } |
| 861 | |
| 862 | static inline Reloc_status |
| 863 | pcrel32_check(unsigned char* view, Address value, Address address, |
| 864 | Overflow_check check) |
| 865 | { return This::template pcrel<32>(view, value, address, check); } |
| 866 | |
| 867 | // Unaligned version of the above. |
| 868 | static inline void |
| 869 | pcrel32_unaligned(unsigned char* view, Address value, Address address) |
| 870 | { This::template pcrel_unaligned<32>(view, value, address, CHECK_NONE); } |
| 871 | |
| 872 | static inline Reloc_status |
| 873 | pcrel32_unaligned_check(unsigned char* view, Address value, Address address, |
| 874 | Overflow_check check) |
| 875 | { return This::template pcrel_unaligned<32>(view, value, address, check); } |
| 876 | |
| 877 | static inline void |
| 878 | pcrel32(unsigned char* view, |
| 879 | const Sized_relobj_file<size, big_endian>* object, |
| 880 | const Symbol_value<size>* psymval, |
| 881 | Address address) |
| 882 | { This::template pcrel<32>(view, object, psymval, address, CHECK_NONE); } |
| 883 | |
| 884 | static inline Reloc_status |
| 885 | pcrel32_check(unsigned char* view, |
| 886 | const Sized_relobj_file<size, big_endian>* object, |
| 887 | const Symbol_value<size>* psymval, |
| 888 | Address address, |
| 889 | Overflow_check check) |
| 890 | { return This::template pcrel<32>(view, object, psymval, address, check); } |
| 891 | |
| 892 | // Do a simple 32-bit PC relative RELA relocation with the addend in |
| 893 | // the relocation. |
| 894 | static inline void |
| 895 | pcrela32(unsigned char* view, Address value, Addendtype addend, |
| 896 | Address address) |
| 897 | { This::template pcrela<32>(view, value, addend, address, CHECK_NONE); } |
| 898 | |
| 899 | static inline Reloc_status |
| 900 | pcrela32_check(unsigned char* view, Address value, Addendtype addend, |
| 901 | Address address, Overflow_check check) |
| 902 | { return This::template pcrela<32>(view, value, addend, address, check); } |
| 903 | |
| 904 | static inline void |
| 905 | pcrela32(unsigned char* view, |
| 906 | const Sized_relobj_file<size, big_endian>* object, |
| 907 | const Symbol_value<size>* psymval, |
| 908 | Addendtype addend, |
| 909 | Address address) |
| 910 | { This::template pcrela<32>(view, object, psymval, addend, address, |
| 911 | CHECK_NONE); } |
| 912 | |
| 913 | static inline Reloc_status |
| 914 | pcrela32_check(unsigned char* view, |
| 915 | const Sized_relobj_file<size, big_endian>* object, |
| 916 | const Symbol_value<size>* psymval, |
| 917 | Addendtype addend, |
| 918 | Address address, |
| 919 | Overflow_check check) |
| 920 | { return This::template pcrela<32>(view, object, psymval, addend, address, |
| 921 | check); } |
| 922 | |
| 923 | // Do a simple 64-bit REL relocation with the addend in the section |
| 924 | // contents. |
| 925 | static inline void |
| 926 | rel64(unsigned char* view, Address value) |
| 927 | { This::template rel<64>(view, value, CHECK_NONE); } |
| 928 | |
| 929 | static inline void |
| 930 | rel64(unsigned char* view, |
| 931 | const Sized_relobj_file<size, big_endian>* object, |
| 932 | const Symbol_value<size>* psymval) |
| 933 | { This::template rel<64>(view, object, psymval, CHECK_NONE); } |
| 934 | |
| 935 | // Do a 64-bit RELA relocation with the addend in the relocation. |
| 936 | static inline void |
| 937 | rela64(unsigned char* view, Address value, Addendtype addend) |
| 938 | { This::template rela<64>(view, value, addend, CHECK_NONE); } |
| 939 | |
| 940 | static inline void |
| 941 | rela64(unsigned char* view, |
| 942 | const Sized_relobj_file<size, big_endian>* object, |
| 943 | const Symbol_value<size>* psymval, |
| 944 | Addendtype addend) |
| 945 | { This::template rela<64>(view, object, psymval, addend, CHECK_NONE); } |
| 946 | |
| 947 | // Do a simple 64-bit PC relative REL relocation with the addend in |
| 948 | // the section contents. |
| 949 | static inline void |
| 950 | pcrel64(unsigned char* view, Address value, Address address) |
| 951 | { This::template pcrel<64>(view, value, address, CHECK_NONE); } |
| 952 | |
| 953 | static inline void |
| 954 | pcrel64(unsigned char* view, |
| 955 | const Sized_relobj_file<size, big_endian>* object, |
| 956 | const Symbol_value<size>* psymval, |
| 957 | Address address) |
| 958 | { This::template pcrel<64>(view, object, psymval, address, CHECK_NONE); } |
| 959 | |
| 960 | // Do a simple 64-bit PC relative RELA relocation with the addend in |
| 961 | // the relocation. |
| 962 | static inline void |
| 963 | pcrela64(unsigned char* view, Address value, Addendtype addend, |
| 964 | Address address) |
| 965 | { This::template pcrela<64>(view, value, addend, address, CHECK_NONE); } |
| 966 | |
| 967 | static inline void |
| 968 | pcrela64(unsigned char* view, |
| 969 | const Sized_relobj_file<size, big_endian>* object, |
| 970 | const Symbol_value<size>* psymval, |
| 971 | Addendtype addend, |
| 972 | Address address) |
| 973 | { This::template pcrela<64>(view, object, psymval, addend, address, |
| 974 | CHECK_NONE); } |
| 975 | }; |
| 976 | |
| 977 | // Convenience class for min and max values of a given BITS length. |
| 978 | |
| 979 | template<int bits> |
| 980 | class Limits |
| 981 | { |
| 982 | public: |
| 983 | static const uint64_t MAX_UNSIGNED = (1ULL << bits) - 1; |
| 984 | static const int64_t MAX_SIGNED = MAX_UNSIGNED >> 1; |
| 985 | static const int64_t MIN_SIGNED = -MAX_SIGNED - 1; |
| 986 | }; |
| 987 | |
| 988 | template<> |
| 989 | class Limits<64> |
| 990 | { |
| 991 | public: |
| 992 | static const uint64_t MAX_UNSIGNED = ~0ULL; |
| 993 | static const int64_t MAX_SIGNED = MAX_UNSIGNED >> 1; |
| 994 | static const int64_t MIN_SIGNED = -MAX_SIGNED - 1; |
| 995 | }; |
| 996 | |
| 997 | // Integer manipulation functions used by various targets when |
| 998 | // performing relocations. |
| 999 | |
| 1000 | template<int bits> |
| 1001 | class Bits |
| 1002 | { |
| 1003 | public: |
| 1004 | // Sign extend an n-bit unsigned integer stored in a uint32_t into |
| 1005 | // an int32_t. BITS must be between 1 and 32. |
| 1006 | static inline int32_t |
| 1007 | sign_extend32(uint32_t val) |
| 1008 | { |
| 1009 | gold_assert(bits > 0 && bits <= 32); |
| 1010 | if (bits == 32) |
| 1011 | return static_cast<int32_t>(val); |
| 1012 | uint32_t mask = (~static_cast<uint32_t>(0)) >> (32 - bits); |
| 1013 | val &= mask; |
| 1014 | uint32_t top_bit = 1U << (bits - 1); |
| 1015 | int32_t as_signed = static_cast<int32_t>(val); |
| 1016 | if ((val & top_bit) != 0) |
| 1017 | as_signed -= static_cast<int32_t>(top_bit * 2); |
| 1018 | return as_signed; |
| 1019 | } |
| 1020 | |
| 1021 | // Return true if VAL (stored in a uint32_t) has overflowed a signed |
| 1022 | // value with BITS bits. |
| 1023 | static inline bool |
| 1024 | has_overflow32(uint32_t val) |
| 1025 | { |
| 1026 | gold_assert(bits > 0 && bits <= 32); |
| 1027 | if (bits == 32) |
| 1028 | return false; |
| 1029 | const int32_t max = static_cast<int32_t>(Limits<bits>::MAX_SIGNED); |
| 1030 | const int32_t min = static_cast<int32_t>(Limits<bits>::MIN_SIGNED); |
| 1031 | int32_t as_signed = static_cast<int32_t>(val); |
| 1032 | return as_signed > max || as_signed < min; |
| 1033 | } |
| 1034 | |
| 1035 | // Return true if VAL (stored in a uint32_t) has overflowed an unsigned |
| 1036 | // value with BITS bits. |
| 1037 | static inline bool |
| 1038 | has_unsigned_overflow32(uint32_t val) |
| 1039 | { |
| 1040 | gold_assert(bits > 0 && bits <= 32); |
| 1041 | if (bits == 32) |
| 1042 | return false; |
| 1043 | const uint32_t max = static_cast<uint32_t>(Limits<bits>::MAX_UNSIGNED); |
| 1044 | return val > max; |
| 1045 | } |
| 1046 | |
| 1047 | // Return true if VAL (stored in a uint32_t) has overflowed both a |
| 1048 | // signed and an unsigned value. E.g., |
| 1049 | // Bits<8>::has_signed_unsigned_overflow32 would check -128 <= VAL < |
| 1050 | // 255. |
| 1051 | static inline bool |
| 1052 | has_signed_unsigned_overflow32(uint32_t val) |
| 1053 | { |
| 1054 | gold_assert(bits > 0 && bits <= 32); |
| 1055 | if (bits == 32) |
| 1056 | return false; |
| 1057 | const int32_t max = static_cast<int32_t>(Limits<bits>::MAX_UNSIGNED); |
| 1058 | const int32_t min = static_cast<int32_t>(Limits<bits>::MIN_SIGNED); |
| 1059 | int32_t as_signed = static_cast<int32_t>(val); |
| 1060 | return as_signed > max || as_signed < min; |
| 1061 | } |
| 1062 | |
| 1063 | // Select bits from A and B using bits in MASK. For each n in |
| 1064 | // [0..31], the n-th bit in the result is chosen from the n-th bits |
| 1065 | // of A and B. A zero selects A and a one selects B. |
| 1066 | static inline uint32_t |
| 1067 | bit_select32(uint32_t a, uint32_t b, uint32_t mask) |
| 1068 | { return (a & ~mask) | (b & mask); } |
| 1069 | |
| 1070 | // Sign extend an n-bit unsigned integer stored in a uint64_t into |
| 1071 | // an int64_t. BITS must be between 1 and 64. |
| 1072 | static inline int64_t |
| 1073 | sign_extend(uint64_t val) |
| 1074 | { |
| 1075 | gold_assert(bits > 0 && bits <= 64); |
| 1076 | if (bits == 64) |
| 1077 | return static_cast<int64_t>(val); |
| 1078 | uint64_t mask = (~static_cast<uint64_t>(0)) >> (64 - bits); |
| 1079 | val &= mask; |
| 1080 | uint64_t top_bit = static_cast<uint64_t>(1) << (bits - 1); |
| 1081 | int64_t as_signed = static_cast<int64_t>(val); |
| 1082 | if ((val & top_bit) != 0) |
| 1083 | as_signed -= static_cast<int64_t>(top_bit * 2); |
| 1084 | return as_signed; |
| 1085 | } |
| 1086 | |
| 1087 | // Return true if VAL (stored in a uint64_t) has overflowed a signed |
| 1088 | // value with BITS bits. |
| 1089 | static inline bool |
| 1090 | has_overflow(uint64_t val) |
| 1091 | { |
| 1092 | gold_assert(bits > 0 && bits <= 64); |
| 1093 | if (bits == 64) |
| 1094 | return false; |
| 1095 | const int64_t max = Limits<bits>::MAX_SIGNED; |
| 1096 | const int64_t min = Limits<bits>::MIN_SIGNED; |
| 1097 | int64_t as_signed = static_cast<int64_t>(val); |
| 1098 | return as_signed > max || as_signed < min; |
| 1099 | } |
| 1100 | |
| 1101 | // Return true if VAL (stored in a uint64_t) has overflowed an unsigned |
| 1102 | // value with BITS bits. |
| 1103 | static inline bool |
| 1104 | has_unsigned_overflow(uint64_t val) |
| 1105 | { |
| 1106 | gold_assert(bits > 0 && bits <= 64); |
| 1107 | if (bits == 64) |
| 1108 | return false; |
| 1109 | const uint64_t max = Limits<bits>::MAX_UNSIGNED; |
| 1110 | return val > max; |
| 1111 | } |
| 1112 | |
| 1113 | // Return true if VAL (stored in a uint64_t) has overflowed both a |
| 1114 | // signed and an unsigned value. E.g., |
| 1115 | // Bits<8>::has_signed_unsigned_overflow would check -128 <= VAL < |
| 1116 | // 255. |
| 1117 | static inline bool |
| 1118 | has_signed_unsigned_overflow64(uint64_t val) |
| 1119 | { |
| 1120 | gold_assert(bits > 0 && bits <= 64); |
| 1121 | if (bits == 64) |
| 1122 | return false; |
| 1123 | const int64_t max = static_cast<int64_t>(Limits<bits>::MAX_UNSIGNED); |
| 1124 | const int64_t min = Limits<bits>::MIN_SIGNED; |
| 1125 | int64_t as_signed = static_cast<int64_t>(val); |
| 1126 | return as_signed > max || as_signed < min; |
| 1127 | } |
| 1128 | |
| 1129 | // Select bits from A and B using bits in MASK. For each n in |
| 1130 | // [0..31], the n-th bit in the result is chosen from the n-th bits |
| 1131 | // of A and B. A zero selects A and a one selects B. |
| 1132 | static inline uint64_t |
| 1133 | bit_select64(uint64_t a, uint64_t b, uint64_t mask) |
| 1134 | { return (a & ~mask) | (b & mask); } |
| 1135 | }; |
| 1136 | |
| 1137 | // Track relocations while reading a section. This lets you ask for |
| 1138 | // the relocation at a certain offset, and see how relocs occur |
| 1139 | // between points of interest. |
| 1140 | |
| 1141 | template<int size, bool big_endian> |
| 1142 | class Track_relocs |
| 1143 | { |
| 1144 | public: |
| 1145 | Track_relocs() |
| 1146 | : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0) |
| 1147 | { } |
| 1148 | |
| 1149 | // Initialize the Track_relocs object. OBJECT is the object holding |
| 1150 | // the reloc section, RELOC_SHNDX is the section index of the reloc |
| 1151 | // section, and RELOC_TYPE is the type of the reloc section |
| 1152 | // (elfcpp::SHT_REL or elfcpp::SHT_RELA). This returns false if |
| 1153 | // something went wrong. |
| 1154 | bool |
| 1155 | initialize(Object* object, unsigned int reloc_shndx, |
| 1156 | unsigned int reloc_type); |
| 1157 | |
| 1158 | // Return the offset in the data section to which the next reloc |
| 1159 | // applies. This returns -1 if there is no next reloc. |
| 1160 | off_t |
| 1161 | next_offset() const; |
| 1162 | |
| 1163 | // Return the symbol index of the next reloc. This returns -1U if |
| 1164 | // there is no next reloc. |
| 1165 | unsigned int |
| 1166 | next_symndx() const; |
| 1167 | |
| 1168 | // Return the addend of the next reloc. This returns 0 if there is |
| 1169 | // no next reloc. |
| 1170 | uint64_t |
| 1171 | next_addend() const; |
| 1172 | |
| 1173 | // Advance to OFFSET within the data section, and return the number |
| 1174 | // of relocs which would be skipped. |
| 1175 | int |
| 1176 | advance(off_t offset); |
| 1177 | |
| 1178 | // Checkpoint the current position in the reloc section. |
| 1179 | section_size_type |
| 1180 | checkpoint() const |
| 1181 | { return this->pos_; } |
| 1182 | |
| 1183 | // Reset the position to CHECKPOINT. |
| 1184 | void |
| 1185 | reset(section_size_type checkpoint) |
| 1186 | { this->pos_ = checkpoint; } |
| 1187 | |
| 1188 | private: |
| 1189 | // The contents of the input object's reloc section. |
| 1190 | const unsigned char* prelocs_; |
| 1191 | // The length of the reloc section. |
| 1192 | section_size_type len_; |
| 1193 | // Our current position in the reloc section. |
| 1194 | section_size_type pos_; |
| 1195 | // The size of the relocs in the section. |
| 1196 | int reloc_size_; |
| 1197 | }; |
| 1198 | |
| 1199 | } // End namespace gold. |
| 1200 | |
| 1201 | #endif // !defined(GOLD_RELOC_H) |