| 1 | // aarch64.cc -- aarch64 target support for gold. |
| 2 | |
| 3 | // Copyright (C) 2014-2015 Free Software Foundation, Inc. |
| 4 | // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@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 | |
| 27 | #include "elfcpp.h" |
| 28 | #include "dwarf.h" |
| 29 | #include "parameters.h" |
| 30 | #include "reloc.h" |
| 31 | #include "aarch64.h" |
| 32 | #include "object.h" |
| 33 | #include "symtab.h" |
| 34 | #include "layout.h" |
| 35 | #include "output.h" |
| 36 | #include "copy-relocs.h" |
| 37 | #include "target.h" |
| 38 | #include "target-reloc.h" |
| 39 | #include "target-select.h" |
| 40 | #include "tls.h" |
| 41 | #include "freebsd.h" |
| 42 | #include "nacl.h" |
| 43 | #include "gc.h" |
| 44 | #include "icf.h" |
| 45 | #include "aarch64-reloc-property.h" |
| 46 | |
| 47 | // The first three .got.plt entries are reserved. |
| 48 | const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3; |
| 49 | |
| 50 | |
| 51 | namespace |
| 52 | { |
| 53 | |
| 54 | using namespace gold; |
| 55 | |
| 56 | template<int size, bool big_endian> |
| 57 | class Output_data_plt_aarch64; |
| 58 | |
| 59 | template<int size, bool big_endian> |
| 60 | class Output_data_plt_aarch64_standard; |
| 61 | |
| 62 | template<int size, bool big_endian> |
| 63 | class Target_aarch64; |
| 64 | |
| 65 | template<int size, bool big_endian> |
| 66 | class AArch64_relocate_functions; |
| 67 | |
| 68 | // Output_data_got_aarch64 class. |
| 69 | |
| 70 | template<int size, bool big_endian> |
| 71 | class Output_data_got_aarch64 : public Output_data_got<size, big_endian> |
| 72 | { |
| 73 | public: |
| 74 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; |
| 75 | Output_data_got_aarch64(Symbol_table* symtab, Layout* layout) |
| 76 | : Output_data_got<size, big_endian>(), |
| 77 | symbol_table_(symtab), layout_(layout) |
| 78 | { } |
| 79 | |
| 80 | // Add a static entry for the GOT entry at OFFSET. GSYM is a global |
| 81 | // symbol and R_TYPE is the code of a dynamic relocation that needs to be |
| 82 | // applied in a static link. |
| 83 | void |
| 84 | add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) |
| 85 | { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); } |
| 86 | |
| 87 | |
| 88 | // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object |
| 89 | // defining a local symbol with INDEX. R_TYPE is the code of a dynamic |
| 90 | // relocation that needs to be applied in a static link. |
| 91 | void |
| 92 | add_static_reloc(unsigned int got_offset, unsigned int r_type, |
| 93 | Sized_relobj_file<size, big_endian>* relobj, |
| 94 | unsigned int index) |
| 95 | { |
| 96 | this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj, |
| 97 | index)); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | protected: |
| 102 | // Write out the GOT table. |
| 103 | void |
| 104 | do_write(Output_file* of) { |
| 105 | // The first entry in the GOT is the address of the .dynamic section. |
| 106 | gold_assert(this->data_size() >= size / 8); |
| 107 | Output_section* dynamic = this->layout_->dynamic_section(); |
| 108 | Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); |
| 109 | this->replace_constant(0, dynamic_addr); |
| 110 | Output_data_got<size, big_endian>::do_write(of); |
| 111 | |
| 112 | // Handling static relocs |
| 113 | if (this->static_relocs_.empty()) |
| 114 | return; |
| 115 | |
| 116 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 117 | |
| 118 | gold_assert(parameters->doing_static_link()); |
| 119 | const off_t offset = this->offset(); |
| 120 | const section_size_type oview_size = |
| 121 | convert_to_section_size_type(this->data_size()); |
| 122 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 123 | |
| 124 | Output_segment* tls_segment = this->layout_->tls_segment(); |
| 125 | gold_assert(tls_segment != NULL); |
| 126 | |
| 127 | AArch64_address aligned_tcb_address = |
| 128 | align_address(Target_aarch64<size, big_endian>::TCB_SIZE, |
| 129 | tls_segment->maximum_alignment()); |
| 130 | |
| 131 | for (size_t i = 0; i < this->static_relocs_.size(); ++i) |
| 132 | { |
| 133 | Static_reloc& reloc(this->static_relocs_[i]); |
| 134 | AArch64_address value; |
| 135 | |
| 136 | if (!reloc.symbol_is_global()) |
| 137 | { |
| 138 | Sized_relobj_file<size, big_endian>* object = reloc.relobj(); |
| 139 | const Symbol_value<size>* psymval = |
| 140 | reloc.relobj()->local_symbol(reloc.index()); |
| 141 | |
| 142 | // We are doing static linking. Issue an error and skip this |
| 143 | // relocation if the symbol is undefined or in a discarded_section. |
| 144 | bool is_ordinary; |
| 145 | unsigned int shndx = psymval->input_shndx(&is_ordinary); |
| 146 | if ((shndx == elfcpp::SHN_UNDEF) |
| 147 | || (is_ordinary |
| 148 | && shndx != elfcpp::SHN_UNDEF |
| 149 | && !object->is_section_included(shndx) |
| 150 | && !this->symbol_table_->is_section_folded(object, shndx))) |
| 151 | { |
| 152 | gold_error(_("undefined or discarded local symbol %u from " |
| 153 | " object %s in GOT"), |
| 154 | reloc.index(), reloc.relobj()->name().c_str()); |
| 155 | continue; |
| 156 | } |
| 157 | value = psymval->value(object, 0); |
| 158 | } |
| 159 | else |
| 160 | { |
| 161 | const Symbol* gsym = reloc.symbol(); |
| 162 | gold_assert(gsym != NULL); |
| 163 | if (gsym->is_forwarder()) |
| 164 | gsym = this->symbol_table_->resolve_forwards(gsym); |
| 165 | |
| 166 | // We are doing static linking. Issue an error and skip this |
| 167 | // relocation if the symbol is undefined or in a discarded_section |
| 168 | // unless it is a weakly_undefined symbol. |
| 169 | if ((gsym->is_defined_in_discarded_section() |
| 170 | || gsym->is_undefined()) |
| 171 | && !gsym->is_weak_undefined()) |
| 172 | { |
| 173 | gold_error(_("undefined or discarded symbol %s in GOT"), |
| 174 | gsym->name()); |
| 175 | continue; |
| 176 | } |
| 177 | |
| 178 | if (!gsym->is_weak_undefined()) |
| 179 | { |
| 180 | const Sized_symbol<size>* sym = |
| 181 | static_cast<const Sized_symbol<size>*>(gsym); |
| 182 | value = sym->value(); |
| 183 | } |
| 184 | else |
| 185 | value = 0; |
| 186 | } |
| 187 | |
| 188 | unsigned got_offset = reloc.got_offset(); |
| 189 | gold_assert(got_offset < oview_size); |
| 190 | |
| 191 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| 192 | Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset); |
| 193 | Valtype x; |
| 194 | switch (reloc.r_type()) |
| 195 | { |
| 196 | case elfcpp::R_AARCH64_TLS_DTPREL64: |
| 197 | x = value; |
| 198 | break; |
| 199 | case elfcpp::R_AARCH64_TLS_TPREL64: |
| 200 | x = value + aligned_tcb_address; |
| 201 | break; |
| 202 | default: |
| 203 | gold_unreachable(); |
| 204 | } |
| 205 | elfcpp::Swap<size, big_endian>::writeval(wv, x); |
| 206 | } |
| 207 | |
| 208 | of->write_output_view(offset, oview_size, oview); |
| 209 | } |
| 210 | |
| 211 | private: |
| 212 | // Symbol table of the output object. |
| 213 | Symbol_table* symbol_table_; |
| 214 | // A pointer to the Layout class, so that we can find the .dynamic |
| 215 | // section when we write out the GOT section. |
| 216 | Layout* layout_; |
| 217 | |
| 218 | // This class represent dynamic relocations that need to be applied by |
| 219 | // gold because we are using TLS relocations in a static link. |
| 220 | class Static_reloc |
| 221 | { |
| 222 | public: |
| 223 | Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) |
| 224 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true) |
| 225 | { this->u_.global.symbol = gsym; } |
| 226 | |
| 227 | Static_reloc(unsigned int got_offset, unsigned int r_type, |
| 228 | Sized_relobj_file<size, big_endian>* relobj, unsigned int index) |
| 229 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false) |
| 230 | { |
| 231 | this->u_.local.relobj = relobj; |
| 232 | this->u_.local.index = index; |
| 233 | } |
| 234 | |
| 235 | // Return the GOT offset. |
| 236 | unsigned int |
| 237 | got_offset() const |
| 238 | { return this->got_offset_; } |
| 239 | |
| 240 | // Relocation type. |
| 241 | unsigned int |
| 242 | r_type() const |
| 243 | { return this->r_type_; } |
| 244 | |
| 245 | // Whether the symbol is global or not. |
| 246 | bool |
| 247 | symbol_is_global() const |
| 248 | { return this->symbol_is_global_; } |
| 249 | |
| 250 | // For a relocation against a global symbol, the global symbol. |
| 251 | Symbol* |
| 252 | symbol() const |
| 253 | { |
| 254 | gold_assert(this->symbol_is_global_); |
| 255 | return this->u_.global.symbol; |
| 256 | } |
| 257 | |
| 258 | // For a relocation against a local symbol, the defining object. |
| 259 | Sized_relobj_file<size, big_endian>* |
| 260 | relobj() const |
| 261 | { |
| 262 | gold_assert(!this->symbol_is_global_); |
| 263 | return this->u_.local.relobj; |
| 264 | } |
| 265 | |
| 266 | // For a relocation against a local symbol, the local symbol index. |
| 267 | unsigned int |
| 268 | index() const |
| 269 | { |
| 270 | gold_assert(!this->symbol_is_global_); |
| 271 | return this->u_.local.index; |
| 272 | } |
| 273 | |
| 274 | private: |
| 275 | // GOT offset of the entry to which this relocation is applied. |
| 276 | unsigned int got_offset_; |
| 277 | // Type of relocation. |
| 278 | unsigned int r_type_; |
| 279 | // Whether this relocation is against a global symbol. |
| 280 | bool symbol_is_global_; |
| 281 | // A global or local symbol. |
| 282 | union |
| 283 | { |
| 284 | struct |
| 285 | { |
| 286 | // For a global symbol, the symbol itself. |
| 287 | Symbol* symbol; |
| 288 | } global; |
| 289 | struct |
| 290 | { |
| 291 | // For a local symbol, the object defining the symbol. |
| 292 | Sized_relobj_file<size, big_endian>* relobj; |
| 293 | // For a local symbol, the symbol index. |
| 294 | unsigned int index; |
| 295 | } local; |
| 296 | } u_; |
| 297 | }; // End of inner class Static_reloc |
| 298 | |
| 299 | std::vector<Static_reloc> static_relocs_; |
| 300 | }; // End of Output_data_got_aarch64 |
| 301 | |
| 302 | |
| 303 | template<int size, bool big_endian> |
| 304 | class AArch64_input_section; |
| 305 | |
| 306 | |
| 307 | template<int size, bool big_endian> |
| 308 | class AArch64_output_section; |
| 309 | |
| 310 | |
| 311 | // Reloc stub class. |
| 312 | |
| 313 | template<int size, bool big_endian> |
| 314 | class Reloc_stub |
| 315 | { |
| 316 | public: |
| 317 | typedef Reloc_stub<size, big_endian> This; |
| 318 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 319 | |
| 320 | // Do not change the value of the enums, they are used to index into |
| 321 | // stub_insns array. |
| 322 | typedef enum |
| 323 | { |
| 324 | ST_NONE = 0, |
| 325 | |
| 326 | // Using adrp/add pair, 4 insns (including alignment) without mem access, |
| 327 | // the fastest stub. This has a limited jump distance, which is tested by |
| 328 | // aarch64_valid_for_adrp_p. |
| 329 | ST_ADRP_BRANCH = 1, |
| 330 | |
| 331 | // Using ldr-absolute-address/br-register, 4 insns with 1 mem access, |
| 332 | // unlimited in jump distance. |
| 333 | ST_LONG_BRANCH_ABS = 2, |
| 334 | |
| 335 | // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1 mem |
| 336 | // access, slowest one. Only used in position independent executables. |
| 337 | ST_LONG_BRANCH_PCREL = 3, |
| 338 | |
| 339 | } Stub_type; |
| 340 | |
| 341 | // Branch range. This is used to calculate the section group size, as well as |
| 342 | // determine whether a stub is needed. |
| 343 | static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2; |
| 344 | static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2); |
| 345 | |
| 346 | // Constant used to determine if an offset fits in the adrp instruction |
| 347 | // encoding. |
| 348 | static const int MAX_ADRP_IMM = (1 << 20) - 1; |
| 349 | static const int MIN_ADRP_IMM = -(1 << 20); |
| 350 | |
| 351 | static const int BYTES_PER_INSN = 4; |
| 352 | static const int STUB_ADDR_ALIGN = 4; |
| 353 | |
| 354 | // Determine whether the offset fits in the jump/branch instruction. |
| 355 | static bool |
| 356 | aarch64_valid_branch_offset_p(int64_t offset) |
| 357 | { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; } |
| 358 | |
| 359 | // Determine whether the offset fits in the adrp immediate field. |
| 360 | static bool |
| 361 | aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest) |
| 362 | { |
| 363 | typedef AArch64_relocate_functions<size, big_endian> Reloc; |
| 364 | int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12; |
| 365 | return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM; |
| 366 | } |
| 367 | |
| 368 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is |
| 369 | // needed. |
| 370 | static Stub_type |
| 371 | stub_type_for_reloc(unsigned int r_type, AArch64_address address, |
| 372 | AArch64_address target); |
| 373 | |
| 374 | Reloc_stub(Stub_type stub_type) |
| 375 | : stub_type_(stub_type), offset_(invalid_offset), |
| 376 | destination_address_(invalid_address) |
| 377 | { } |
| 378 | |
| 379 | ~Reloc_stub() |
| 380 | { } |
| 381 | |
| 382 | // Return offset of code stub from beginning of its containing stub table. |
| 383 | section_offset_type |
| 384 | offset() const |
| 385 | { |
| 386 | gold_assert(this->offset_ != invalid_offset); |
| 387 | return this->offset_; |
| 388 | } |
| 389 | |
| 390 | // Set offset of code stub from beginning of its containing stub table. |
| 391 | void |
| 392 | set_offset(section_offset_type offset) |
| 393 | { this->offset_ = offset; } |
| 394 | |
| 395 | // Return destination address. |
| 396 | AArch64_address |
| 397 | destination_address() const |
| 398 | { |
| 399 | gold_assert(this->destination_address_ != this->invalid_address); |
| 400 | return this->destination_address_; |
| 401 | } |
| 402 | |
| 403 | // Set destination address. |
| 404 | void |
| 405 | set_destination_address(AArch64_address address) |
| 406 | { |
| 407 | gold_assert(address != this->invalid_address); |
| 408 | this->destination_address_ = address; |
| 409 | } |
| 410 | |
| 411 | // Reset the destination address. |
| 412 | void |
| 413 | reset_destination_address() |
| 414 | { this->destination_address_ = this->invalid_address; } |
| 415 | |
| 416 | // Return the stub type. |
| 417 | Stub_type |
| 418 | stub_type() const |
| 419 | { return stub_type_; } |
| 420 | |
| 421 | // Return the stub size. |
| 422 | uint32_t |
| 423 | stub_size() const |
| 424 | { return this->stub_insn_number() * BYTES_PER_INSN; } |
| 425 | |
| 426 | // Return the instruction number of this stub instance. |
| 427 | int |
| 428 | stub_insn_number() const |
| 429 | { return stub_insns_[this->stub_type_][0]; } |
| 430 | |
| 431 | // Note the first "insn" is the number of total insns in this array. |
| 432 | const uint32_t* |
| 433 | stub_insns() const |
| 434 | { return stub_insns_[this->stub_type_]; } |
| 435 | |
| 436 | // Write stub to output file. |
| 437 | void |
| 438 | write(unsigned char* view, section_size_type view_size) |
| 439 | { this->do_write(view, view_size); } |
| 440 | |
| 441 | // The key class used to index the stub instance in the stub table's stub map. |
| 442 | class Key |
| 443 | { |
| 444 | public: |
| 445 | Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj, |
| 446 | unsigned int r_sym, int32_t addend) |
| 447 | : stub_type_(stub_type), addend_(addend) |
| 448 | { |
| 449 | if (symbol != NULL) |
| 450 | { |
| 451 | this->r_sym_ = Reloc_stub::invalid_index; |
| 452 | this->u_.symbol = symbol; |
| 453 | } |
| 454 | else |
| 455 | { |
| 456 | gold_assert(relobj != NULL && r_sym != invalid_index); |
| 457 | this->r_sym_ = r_sym; |
| 458 | this->u_.relobj = relobj; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | ~Key() |
| 463 | { } |
| 464 | |
| 465 | // Return stub type. |
| 466 | Stub_type |
| 467 | stub_type() const |
| 468 | { return this->stub_type_; } |
| 469 | |
| 470 | // Return the local symbol index or invalid_index. |
| 471 | unsigned int |
| 472 | r_sym() const |
| 473 | { return this->r_sym_; } |
| 474 | |
| 475 | // Return the symbol if there is one. |
| 476 | const Symbol* |
| 477 | symbol() const |
| 478 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } |
| 479 | |
| 480 | // Return the relobj if there is one. |
| 481 | const Relobj* |
| 482 | relobj() const |
| 483 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } |
| 484 | |
| 485 | // Whether this equals to another key k. |
| 486 | bool |
| 487 | eq(const Key& k) const |
| 488 | { |
| 489 | return ((this->stub_type_ == k.stub_type_) |
| 490 | && (this->r_sym_ == k.r_sym_) |
| 491 | && ((this->r_sym_ != Reloc_stub::invalid_index) |
| 492 | ? (this->u_.relobj == k.u_.relobj) |
| 493 | : (this->u_.symbol == k.u_.symbol)) |
| 494 | && (this->addend_ == k.addend_)); |
| 495 | } |
| 496 | |
| 497 | // Return a hash value. |
| 498 | size_t |
| 499 | hash_value() const |
| 500 | { |
| 501 | size_t name_hash_value = gold::string_hash<char>( |
| 502 | (this->r_sym_ != Reloc_stub::invalid_index) |
| 503 | ? this->u_.relobj->name().c_str() |
| 504 | : this->u_.symbol->name()); |
| 505 | // We only have 4 stub types. |
| 506 | size_t stub_type_hash_value = 0x03 & this->stub_type_; |
| 507 | return (name_hash_value |
| 508 | ^ stub_type_hash_value |
| 509 | ^ ((this->r_sym_ & 0x3fff) << 2) |
| 510 | ^ ((this->addend_ & 0xffff) << 16)); |
| 511 | } |
| 512 | |
| 513 | // Functors for STL associative containers. |
| 514 | struct hash |
| 515 | { |
| 516 | size_t |
| 517 | operator()(const Key& k) const |
| 518 | { return k.hash_value(); } |
| 519 | }; |
| 520 | |
| 521 | struct equal_to |
| 522 | { |
| 523 | bool |
| 524 | operator()(const Key& k1, const Key& k2) const |
| 525 | { return k1.eq(k2); } |
| 526 | }; |
| 527 | |
| 528 | private: |
| 529 | // Stub type. |
| 530 | const Stub_type stub_type_; |
| 531 | // If this is a local symbol, this is the index in the defining object. |
| 532 | // Otherwise, it is invalid_index for a global symbol. |
| 533 | unsigned int r_sym_; |
| 534 | // If r_sym_ is an invalid index, this points to a global symbol. |
| 535 | // Otherwise, it points to a relobj. We used the unsized and target |
| 536 | // independent Symbol and Relobj classes instead of Sized_symbol<32> and |
| 537 | // Arm_relobj, in order to avoid making the stub class a template |
| 538 | // as most of the stub machinery is endianness-neutral. However, it |
| 539 | // may require a bit of casting done by users of this class. |
| 540 | union |
| 541 | { |
| 542 | const Symbol* symbol; |
| 543 | const Relobj* relobj; |
| 544 | } u_; |
| 545 | // Addend associated with a reloc. |
| 546 | int32_t addend_; |
| 547 | }; // End of inner class Reloc_stub::Key |
| 548 | |
| 549 | protected: |
| 550 | // This may be overridden in the child class. |
| 551 | virtual void |
| 552 | do_write(unsigned char*, section_size_type); |
| 553 | |
| 554 | private: |
| 555 | static const section_offset_type invalid_offset = |
| 556 | static_cast<section_offset_type>(-1); |
| 557 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); |
| 558 | static const AArch64_address invalid_address = |
| 559 | static_cast<AArch64_address>(-1); |
| 560 | |
| 561 | static const uint32_t stub_insns_[][10]; |
| 562 | |
| 563 | const Stub_type stub_type_; |
| 564 | section_offset_type offset_; |
| 565 | AArch64_address destination_address_; |
| 566 | }; // End of Reloc_stub |
| 567 | |
| 568 | |
| 569 | // Write data to output file. |
| 570 | |
| 571 | template<int size, bool big_endian> |
| 572 | void |
| 573 | Reloc_stub<size, big_endian>:: |
| 574 | do_write(unsigned char* view, section_size_type) |
| 575 | { |
| 576 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 577 | const uint32_t* insns = this->stub_insns(); |
| 578 | uint32_t num_insns = this->stub_insn_number(); |
| 579 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 580 | for (uint32_t i = 1; i <= num_insns; ++i) |
| 581 | elfcpp::Swap<32, big_endian>::writeval(ip + i - 1, insns[i]); |
| 582 | } |
| 583 | |
| 584 | |
| 585 | // Stubs instructions definition. |
| 586 | |
| 587 | template<int size, bool big_endian> |
| 588 | const uint32_t |
| 589 | Reloc_stub<size, big_endian>::stub_insns_[][10] = |
| 590 | { |
| 591 | // The first element of each group is the num of the insns. |
| 592 | |
| 593 | // ST_NONE |
| 594 | {0, 0}, |
| 595 | |
| 596 | // ST_ADRP_BRANCH |
| 597 | { |
| 598 | 4, |
| 599 | 0x90000010, /* adrp ip0, X */ |
| 600 | /* ADR_PREL_PG_HI21(X) */ |
| 601 | 0x91000210, /* add ip0, ip0, :lo12:X */ |
| 602 | /* ADD_ABS_LO12_NC(X) */ |
| 603 | 0xd61f0200, /* br ip0 */ |
| 604 | 0x00000000, /* alignment padding */ |
| 605 | }, |
| 606 | |
| 607 | // ST_LONG_BRANCH_ABS |
| 608 | { |
| 609 | 4, |
| 610 | 0x58000050, /* ldr ip0, 0x8 */ |
| 611 | 0xd61f0200, /* br ip0 */ |
| 612 | 0x00000000, /* address field */ |
| 613 | 0x00000000, /* address fields */ |
| 614 | }, |
| 615 | |
| 616 | // ST_LONG_BRANCH_PCREL |
| 617 | { |
| 618 | 8, |
| 619 | 0x58000090, /* ldr ip0, 0x10 */ |
| 620 | 0x10000011, /* adr ip1, #0 */ |
| 621 | 0x8b110210, /* add ip0, ip0, ip1 */ |
| 622 | 0xd61f0200, /* br ip0 */ |
| 623 | 0x00000000, /* address field */ |
| 624 | 0x00000000, /* address field */ |
| 625 | 0x00000000, /* alignment padding */ |
| 626 | 0x00000000, /* alignment padding */ |
| 627 | } |
| 628 | }; |
| 629 | |
| 630 | |
| 631 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is |
| 632 | // needed. |
| 633 | |
| 634 | template<int size, bool big_endian> |
| 635 | inline |
| 636 | typename Reloc_stub<size, big_endian>::Stub_type |
| 637 | Reloc_stub<size, big_endian>::stub_type_for_reloc( |
| 638 | unsigned int r_type, AArch64_address location, AArch64_address dest) |
| 639 | { |
| 640 | int64_t branch_offset = 0; |
| 641 | switch(r_type) |
| 642 | { |
| 643 | case elfcpp::R_AARCH64_CALL26: |
| 644 | case elfcpp::R_AARCH64_JUMP26: |
| 645 | branch_offset = dest - location; |
| 646 | break; |
| 647 | default: |
| 648 | gold_unreachable(); |
| 649 | } |
| 650 | |
| 651 | if (aarch64_valid_branch_offset_p(branch_offset)) |
| 652 | return ST_NONE; |
| 653 | |
| 654 | if (aarch64_valid_for_adrp_p(location, dest)) |
| 655 | return ST_ADRP_BRANCH; |
| 656 | |
| 657 | if (parameters->options().output_is_position_independent() |
| 658 | && parameters->options().output_is_executable()) |
| 659 | return ST_LONG_BRANCH_PCREL; |
| 660 | |
| 661 | return ST_LONG_BRANCH_ABS; |
| 662 | } |
| 663 | |
| 664 | // A class to hold stubs for the ARM target. |
| 665 | |
| 666 | template<int size, bool big_endian> |
| 667 | class Stub_table : public Output_data |
| 668 | { |
| 669 | public: |
| 670 | typedef Target_aarch64<size, big_endian> The_target_aarch64; |
| 671 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 672 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 673 | typedef Reloc_stub<size, big_endian> The_reloc_stub; |
| 674 | typedef typename The_reloc_stub::Key The_reloc_stub_key; |
| 675 | typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash; |
| 676 | typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to; |
| 677 | typedef Stub_table<size, big_endian> The_stub_table; |
| 678 | typedef Unordered_map<The_reloc_stub_key, The_reloc_stub*, |
| 679 | The_reloc_stub_key_hash, The_reloc_stub_key_equal_to> |
| 680 | Reloc_stub_map; |
| 681 | typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter; |
| 682 | typedef Relocate_info<size, big_endian> The_relocate_info; |
| 683 | |
| 684 | Stub_table(The_aarch64_input_section* owner) |
| 685 | : Output_data(), owner_(owner), reloc_stubs_size_(0), prev_data_size_(0) |
| 686 | { } |
| 687 | |
| 688 | ~Stub_table() |
| 689 | { } |
| 690 | |
| 691 | The_aarch64_input_section* |
| 692 | owner() const |
| 693 | { return owner_; } |
| 694 | |
| 695 | // Whether this stub table is empty. |
| 696 | bool |
| 697 | empty() const |
| 698 | { return reloc_stubs_.empty(); } |
| 699 | |
| 700 | // Return the current data size. |
| 701 | off_t |
| 702 | current_data_size() const |
| 703 | { return this->current_data_size_for_child(); } |
| 704 | |
| 705 | // Add a STUB using KEY. The caller is responsible for avoiding addition |
| 706 | // if a STUB with the same key has already been added. |
| 707 | void |
| 708 | add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key); |
| 709 | |
| 710 | // Finalize stubs. No-op here, just for completeness. |
| 711 | void |
| 712 | finalize_stubs() |
| 713 | { } |
| 714 | |
| 715 | // Look up a relocation stub using KEY. Return NULL if there is none. |
| 716 | The_reloc_stub* |
| 717 | find_reloc_stub(The_reloc_stub_key& key) |
| 718 | { |
| 719 | Reloc_stub_map_const_iter p = this->reloc_stubs_.find(key); |
| 720 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; |
| 721 | } |
| 722 | |
| 723 | // Relocate stubs in this stub table. |
| 724 | void |
| 725 | relocate_stubs(const The_relocate_info*, |
| 726 | The_target_aarch64*, |
| 727 | Output_section*, |
| 728 | unsigned char*, |
| 729 | AArch64_address, |
| 730 | section_size_type); |
| 731 | |
| 732 | // Update data size at the end of a relaxation pass. Return true if data size |
| 733 | // is different from that of the previous relaxation pass. |
| 734 | bool |
| 735 | update_data_size_changed_p() |
| 736 | { |
| 737 | // No addralign changed here. |
| 738 | off_t s = this->reloc_stubs_size_; |
| 739 | bool changed = (s != this->prev_data_size_); |
| 740 | this->prev_data_size_ = s; |
| 741 | return changed; |
| 742 | } |
| 743 | |
| 744 | protected: |
| 745 | // Write out section contents. |
| 746 | void |
| 747 | do_write(Output_file*); |
| 748 | |
| 749 | // Return the required alignment. |
| 750 | uint64_t |
| 751 | do_addralign() const |
| 752 | { return The_reloc_stub::STUB_ADDR_ALIGN; } |
| 753 | |
| 754 | // Reset address and file offset. |
| 755 | void |
| 756 | do_reset_address_and_file_offset() |
| 757 | { this->set_current_data_size_for_child(this->prev_data_size_); } |
| 758 | |
| 759 | // Set final data size. |
| 760 | void |
| 761 | set_final_data_size() |
| 762 | { this->set_data_size(this->current_data_size()); } |
| 763 | |
| 764 | private: |
| 765 | // Relocate one stub. |
| 766 | void |
| 767 | relocate_stub(The_reloc_stub*, |
| 768 | const The_relocate_info*, |
| 769 | The_target_aarch64*, |
| 770 | Output_section*, |
| 771 | unsigned char*, |
| 772 | AArch64_address, |
| 773 | section_size_type); |
| 774 | |
| 775 | private: |
| 776 | // Owner of this stub table. |
| 777 | The_aarch64_input_section* owner_; |
| 778 | // The relocation stubs. |
| 779 | Reloc_stub_map reloc_stubs_; |
| 780 | // Size of reloc stubs. |
| 781 | off_t reloc_stubs_size_; |
| 782 | // data size of this in the previous pass. |
| 783 | off_t prev_data_size_; |
| 784 | }; // End of Stub_table |
| 785 | |
| 786 | |
| 787 | // Add a STUB using KEY. The caller is responsible for avoiding addition |
| 788 | // if a STUB with the same key has already been added. |
| 789 | |
| 790 | template<int size, bool big_endian> |
| 791 | void |
| 792 | Stub_table<size, big_endian>::add_reloc_stub( |
| 793 | The_reloc_stub* stub, const The_reloc_stub_key& key) |
| 794 | { |
| 795 | gold_assert(stub->stub_type() == key.stub_type()); |
| 796 | this->reloc_stubs_[key] = stub; |
| 797 | |
| 798 | // Assign stub offset early. We can do this because we never remove |
| 799 | // reloc stubs and they are in the beginning of the stub table. |
| 800 | this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_, |
| 801 | The_reloc_stub::STUB_ADDR_ALIGN); |
| 802 | stub->set_offset(this->reloc_stubs_size_); |
| 803 | this->reloc_stubs_size_ += stub->stub_size(); |
| 804 | } |
| 805 | |
| 806 | |
| 807 | // Relocate all stubs in this stub table. |
| 808 | |
| 809 | template<int size, bool big_endian> |
| 810 | void |
| 811 | Stub_table<size, big_endian>:: |
| 812 | relocate_stubs(const The_relocate_info* relinfo, |
| 813 | The_target_aarch64* target_aarch64, |
| 814 | Output_section* output_section, |
| 815 | unsigned char* view, |
| 816 | AArch64_address address, |
| 817 | section_size_type view_size) |
| 818 | { |
| 819 | // "view_size" is the total size of the stub_table. |
| 820 | gold_assert(address == this->address() && |
| 821 | view_size == static_cast<section_size_type>(this->data_size())); |
| 822 | for(Reloc_stub_map_const_iter p = this->reloc_stubs_.begin(); |
| 823 | p != this->reloc_stubs_.end(); ++p) |
| 824 | relocate_stub(p->second, relinfo, target_aarch64, output_section, |
| 825 | view, address, view_size); |
| 826 | } |
| 827 | |
| 828 | |
| 829 | // Relocate one stub. This is a helper for Stub_table::relocate_stubs(). |
| 830 | |
| 831 | template<int size, bool big_endian> |
| 832 | void |
| 833 | Stub_table<size, big_endian>:: |
| 834 | relocate_stub(The_reloc_stub* stub, |
| 835 | const The_relocate_info* relinfo, |
| 836 | The_target_aarch64* target_aarch64, |
| 837 | Output_section* output_section, |
| 838 | unsigned char* view, |
| 839 | AArch64_address address, |
| 840 | section_size_type view_size) |
| 841 | { |
| 842 | // "offset" is the offset from the beginning of the stub_table. |
| 843 | section_size_type offset = stub->offset(); |
| 844 | section_size_type stub_size = stub->stub_size(); |
| 845 | // "view_size" is the total size of the stub_table. |
| 846 | gold_assert(offset + stub_size <= view_size); |
| 847 | |
| 848 | target_aarch64->relocate_stub(stub, relinfo, output_section, |
| 849 | view + offset, address + offset, view_size); |
| 850 | } |
| 851 | |
| 852 | |
| 853 | // Write out the stubs to file. |
| 854 | |
| 855 | template<int size, bool big_endian> |
| 856 | void |
| 857 | Stub_table<size, big_endian>::do_write(Output_file* of) |
| 858 | { |
| 859 | off_t offset = this->offset(); |
| 860 | const section_size_type oview_size = |
| 861 | convert_to_section_size_type(this->data_size()); |
| 862 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 863 | |
| 864 | // Write relocation stubs. |
| 865 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); |
| 866 | p != this->reloc_stubs_.end(); ++p) |
| 867 | { |
| 868 | The_reloc_stub* stub = p->second; |
| 869 | AArch64_address address = this->address() + stub->offset(); |
| 870 | gold_assert(address == |
| 871 | align_address(address, The_reloc_stub::STUB_ADDR_ALIGN)); |
| 872 | stub->write(oview + stub->offset(), stub->stub_size()); |
| 873 | } |
| 874 | |
| 875 | of->write_output_view(this->offset(), oview_size, oview); |
| 876 | } |
| 877 | |
| 878 | |
| 879 | // AArch64_relobj class. |
| 880 | |
| 881 | template<int size, bool big_endian> |
| 882 | class AArch64_relobj : public Sized_relobj_file<size, big_endian> |
| 883 | { |
| 884 | public: |
| 885 | typedef AArch64_relobj<size, big_endian> This; |
| 886 | typedef Target_aarch64<size, big_endian> The_target_aarch64; |
| 887 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 888 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 889 | typedef Stub_table<size, big_endian> The_stub_table; |
| 890 | typedef std::vector<The_stub_table*> Stub_table_list; |
| 891 | static const AArch64_address invalid_address = |
| 892 | static_cast<AArch64_address>(-1); |
| 893 | |
| 894 | AArch64_relobj(const std::string& name, Input_file* input_file, off_t offset, |
| 895 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| 896 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), |
| 897 | stub_tables_() |
| 898 | { } |
| 899 | |
| 900 | ~AArch64_relobj() |
| 901 | { } |
| 902 | |
| 903 | // Return the stub table of the SHNDX-th section if there is one. |
| 904 | The_stub_table* |
| 905 | stub_table(unsigned int shndx) const |
| 906 | { |
| 907 | gold_assert(shndx < this->stub_tables_.size()); |
| 908 | return this->stub_tables_[shndx]; |
| 909 | } |
| 910 | |
| 911 | // Set STUB_TABLE to be the stub_table of the SHNDX-th section. |
| 912 | void |
| 913 | set_stub_table(unsigned int shndx, The_stub_table* stub_table) |
| 914 | { |
| 915 | gold_assert(shndx < this->stub_tables_.size()); |
| 916 | this->stub_tables_[shndx] = stub_table; |
| 917 | } |
| 918 | |
| 919 | // Scan all relocation sections for stub generation. |
| 920 | void |
| 921 | scan_sections_for_stubs(The_target_aarch64*, const Symbol_table*, |
| 922 | const Layout*); |
| 923 | |
| 924 | // Whether a section is a scannable text section. |
| 925 | bool |
| 926 | text_section_is_scannable(const elfcpp::Shdr<size, big_endian>&, unsigned int, |
| 927 | const Output_section*, const Symbol_table*); |
| 928 | |
| 929 | // Convert regular input section with index SHNDX to a relaxed section. |
| 930 | void |
| 931 | convert_input_section_to_relaxed_section(unsigned /* shndx */) |
| 932 | { |
| 933 | // The stubs have relocations and we need to process them after writing |
| 934 | // out the stubs. So relocation now must follow section write. |
| 935 | this->set_relocs_must_follow_section_writes(); |
| 936 | } |
| 937 | |
| 938 | protected: |
| 939 | // Post constructor setup. |
| 940 | void |
| 941 | do_setup() |
| 942 | { |
| 943 | // Call parent's setup method. |
| 944 | Sized_relobj_file<size, big_endian>::do_setup(); |
| 945 | |
| 946 | // Initialize look-up tables. |
| 947 | this->stub_tables_.resize(this->shnum()); |
| 948 | } |
| 949 | |
| 950 | virtual void |
| 951 | do_relocate_sections( |
| 952 | const Symbol_table* symtab, const Layout* layout, |
| 953 | const unsigned char* pshdrs, Output_file* of, |
| 954 | typename Sized_relobj_file<size, big_endian>::Views* pviews); |
| 955 | |
| 956 | private: |
| 957 | // Whether a section needs to be scanned for relocation stubs. |
| 958 | bool |
| 959 | section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&, |
| 960 | const Relobj::Output_sections&, |
| 961 | const Symbol_table*, const unsigned char*); |
| 962 | |
| 963 | // List of stub tables. |
| 964 | Stub_table_list stub_tables_; |
| 965 | }; // End of AArch64_relobj |
| 966 | |
| 967 | |
| 968 | // Relocate sections. |
| 969 | |
| 970 | template<int size, bool big_endian> |
| 971 | void |
| 972 | AArch64_relobj<size, big_endian>::do_relocate_sections( |
| 973 | const Symbol_table* symtab, const Layout* layout, |
| 974 | const unsigned char* pshdrs, Output_file* of, |
| 975 | typename Sized_relobj_file<size, big_endian>::Views* pviews) |
| 976 | { |
| 977 | // Call parent to relocate sections. |
| 978 | Sized_relobj_file<size, big_endian>::do_relocate_sections(symtab, layout, |
| 979 | pshdrs, of, pviews); |
| 980 | |
| 981 | // We do not generate stubs if doing a relocatable link. |
| 982 | if (parameters->options().relocatable()) |
| 983 | return; |
| 984 | |
| 985 | Relocate_info<size, big_endian> relinfo; |
| 986 | relinfo.symtab = symtab; |
| 987 | relinfo.layout = layout; |
| 988 | relinfo.object = this; |
| 989 | |
| 990 | // Relocate stub tables. |
| 991 | unsigned int shnum = this->shnum(); |
| 992 | The_target_aarch64* target = The_target_aarch64::current_target(); |
| 993 | |
| 994 | for (unsigned int i = 1; i < shnum; ++i) |
| 995 | { |
| 996 | The_aarch64_input_section* aarch64_input_section = |
| 997 | target->find_aarch64_input_section(this, i); |
| 998 | if (aarch64_input_section != NULL |
| 999 | && aarch64_input_section->is_stub_table_owner() |
| 1000 | && !aarch64_input_section->stub_table()->empty()) |
| 1001 | { |
| 1002 | Output_section* os = this->output_section(i); |
| 1003 | gold_assert(os != NULL); |
| 1004 | |
| 1005 | relinfo.reloc_shndx = elfcpp::SHN_UNDEF; |
| 1006 | relinfo.reloc_shdr = NULL; |
| 1007 | relinfo.data_shndx = i; |
| 1008 | relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<size>::shdr_size; |
| 1009 | |
| 1010 | typename Sized_relobj_file<size, big_endian>::View_size& |
| 1011 | view_struct = (*pviews)[i]; |
| 1012 | gold_assert(view_struct.view != NULL); |
| 1013 | |
| 1014 | The_stub_table* stub_table = aarch64_input_section->stub_table(); |
| 1015 | off_t offset = stub_table->address() - view_struct.address; |
| 1016 | unsigned char* view = view_struct.view + offset; |
| 1017 | AArch64_address address = stub_table->address(); |
| 1018 | section_size_type view_size = stub_table->data_size(); |
| 1019 | stub_table->relocate_stubs(&relinfo, target, os, view, address, |
| 1020 | view_size); |
| 1021 | } |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | |
| 1026 | // Determine if an input section is scannable for stub processing. SHDR is |
| 1027 | // the header of the section and SHNDX is the section index. OS is the output |
| 1028 | // section for the input section and SYMTAB is the global symbol table used to |
| 1029 | // look up ICF information. |
| 1030 | |
| 1031 | template<int size, bool big_endian> |
| 1032 | bool |
| 1033 | AArch64_relobj<size, big_endian>::text_section_is_scannable( |
| 1034 | const elfcpp::Shdr<size, big_endian>& text_shdr, |
| 1035 | unsigned int text_shndx, |
| 1036 | const Output_section* os, |
| 1037 | const Symbol_table* symtab) |
| 1038 | { |
| 1039 | // Skip any empty sections, unallocated sections or sections whose |
| 1040 | // type are not SHT_PROGBITS. |
| 1041 | if (text_shdr.get_sh_size() == 0 |
| 1042 | || (text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0 |
| 1043 | || text_shdr.get_sh_type() != elfcpp::SHT_PROGBITS) |
| 1044 | return false; |
| 1045 | |
| 1046 | // Skip any discarded or ICF'ed sections. |
| 1047 | if (os == NULL || symtab->is_section_folded(this, text_shndx)) |
| 1048 | return false; |
| 1049 | |
| 1050 | // Skip exception frame. |
| 1051 | if (strcmp(os->name(), ".eh_frame") == 0) |
| 1052 | return false ; |
| 1053 | |
| 1054 | gold_assert(!this->is_output_section_offset_invalid(text_shndx) || |
| 1055 | os->find_relaxed_input_section(this, text_shndx) != NULL); |
| 1056 | |
| 1057 | return true; |
| 1058 | } |
| 1059 | |
| 1060 | |
| 1061 | // Determine if we want to scan the SHNDX-th section for relocation stubs. |
| 1062 | // This is a helper for AArch64_relobj::scan_sections_for_stubs(). |
| 1063 | |
| 1064 | template<int size, bool big_endian> |
| 1065 | bool |
| 1066 | AArch64_relobj<size, big_endian>::section_needs_reloc_stub_scanning( |
| 1067 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 1068 | const Relobj::Output_sections& out_sections, |
| 1069 | const Symbol_table* symtab, |
| 1070 | const unsigned char* pshdrs) |
| 1071 | { |
| 1072 | unsigned int sh_type = shdr.get_sh_type(); |
| 1073 | if (sh_type != elfcpp::SHT_RELA) |
| 1074 | return false; |
| 1075 | |
| 1076 | // Ignore empty section. |
| 1077 | off_t sh_size = shdr.get_sh_size(); |
| 1078 | if (sh_size == 0) |
| 1079 | return false; |
| 1080 | |
| 1081 | // Ignore reloc section with unexpected symbol table. The |
| 1082 | // error will be reported in the final link. |
| 1083 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx()) |
| 1084 | return false; |
| 1085 | |
| 1086 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 1087 | unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 1088 | |
| 1089 | // Ignore reloc section with unexpected entsize or uneven size. |
| 1090 | // The error will be reported in the final link. |
| 1091 | if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0) |
| 1092 | return false; |
| 1093 | |
| 1094 | // Ignore reloc section with bad info. This error will be |
| 1095 | // reported in the final link. |
| 1096 | unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_info()); |
| 1097 | if (text_shndx >= this->shnum()) |
| 1098 | return false; |
| 1099 | |
| 1100 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 1101 | const elfcpp::Shdr<size, big_endian> text_shdr(pshdrs + |
| 1102 | text_shndx * shdr_size); |
| 1103 | return this->text_section_is_scannable(text_shdr, text_shndx, |
| 1104 | out_sections[text_shndx], symtab); |
| 1105 | } |
| 1106 | |
| 1107 | |
| 1108 | // Scan relocations for stub generation. |
| 1109 | |
| 1110 | template<int size, bool big_endian> |
| 1111 | void |
| 1112 | AArch64_relobj<size, big_endian>::scan_sections_for_stubs( |
| 1113 | The_target_aarch64* target, |
| 1114 | const Symbol_table* symtab, |
| 1115 | const Layout* layout) |
| 1116 | { |
| 1117 | unsigned int shnum = this->shnum(); |
| 1118 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 1119 | |
| 1120 | // Read the section headers. |
| 1121 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), |
| 1122 | shnum * shdr_size, |
| 1123 | true, true); |
| 1124 | |
| 1125 | // To speed up processing, we set up hash tables for fast lookup of |
| 1126 | // input offsets to output addresses. |
| 1127 | this->initialize_input_to_output_maps(); |
| 1128 | |
| 1129 | const Relobj::Output_sections& out_sections(this->output_sections()); |
| 1130 | |
| 1131 | Relocate_info<size, big_endian> relinfo; |
| 1132 | relinfo.symtab = symtab; |
| 1133 | relinfo.layout = layout; |
| 1134 | relinfo.object = this; |
| 1135 | |
| 1136 | // Do relocation stubs scanning. |
| 1137 | const unsigned char* p = pshdrs + shdr_size; |
| 1138 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) |
| 1139 | { |
| 1140 | const elfcpp::Shdr<size, big_endian> shdr(p); |
| 1141 | if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab, |
| 1142 | pshdrs)) |
| 1143 | { |
| 1144 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); |
| 1145 | AArch64_address output_offset = |
| 1146 | this->get_output_section_offset(index); |
| 1147 | AArch64_address output_address; |
| 1148 | if (output_offset != invalid_address) |
| 1149 | { |
| 1150 | output_address = out_sections[index]->address() + output_offset; |
| 1151 | } |
| 1152 | else |
| 1153 | { |
| 1154 | // Currently this only happens for a relaxed section. |
| 1155 | const Output_relaxed_input_section* poris = |
| 1156 | out_sections[index]->find_relaxed_input_section(this, index); |
| 1157 | gold_assert(poris != NULL); |
| 1158 | output_address = poris->address(); |
| 1159 | } |
| 1160 | |
| 1161 | // Get the relocations. |
| 1162 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), |
| 1163 | shdr.get_sh_size(), |
| 1164 | true, false); |
| 1165 | |
| 1166 | // Get the section contents. |
| 1167 | section_size_type input_view_size = 0; |
| 1168 | const unsigned char* input_view = |
| 1169 | this->section_contents(index, &input_view_size, false); |
| 1170 | |
| 1171 | relinfo.reloc_shndx = i; |
| 1172 | relinfo.data_shndx = index; |
| 1173 | unsigned int sh_type = shdr.get_sh_type(); |
| 1174 | unsigned int reloc_size; |
| 1175 | gold_assert (sh_type == elfcpp::SHT_RELA); |
| 1176 | reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 1177 | |
| 1178 | Output_section* os = out_sections[index]; |
| 1179 | target->scan_section_for_stubs(&relinfo, sh_type, prelocs, |
| 1180 | shdr.get_sh_size() / reloc_size, |
| 1181 | os, |
| 1182 | output_offset == invalid_address, |
| 1183 | input_view, output_address, |
| 1184 | input_view_size); |
| 1185 | } |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | |
| 1190 | // A class to wrap an ordinary input section containing executable code. |
| 1191 | |
| 1192 | template<int size, bool big_endian> |
| 1193 | class AArch64_input_section : public Output_relaxed_input_section |
| 1194 | { |
| 1195 | public: |
| 1196 | typedef Stub_table<size, big_endian> The_stub_table; |
| 1197 | |
| 1198 | AArch64_input_section(Relobj* relobj, unsigned int shndx) |
| 1199 | : Output_relaxed_input_section(relobj, shndx, 1), |
| 1200 | stub_table_(NULL), |
| 1201 | original_contents_(NULL), original_size_(0), |
| 1202 | original_addralign_(1) |
| 1203 | { } |
| 1204 | |
| 1205 | ~AArch64_input_section() |
| 1206 | { delete[] this->original_contents_; } |
| 1207 | |
| 1208 | // Initialize. |
| 1209 | void |
| 1210 | init(); |
| 1211 | |
| 1212 | // Set the stub_table. |
| 1213 | void |
| 1214 | set_stub_table(The_stub_table* st) |
| 1215 | { this->stub_table_ = st; } |
| 1216 | |
| 1217 | // Whether this is a stub table owner. |
| 1218 | bool |
| 1219 | is_stub_table_owner() const |
| 1220 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } |
| 1221 | |
| 1222 | // Return the original size of the section. |
| 1223 | uint32_t |
| 1224 | original_size() const |
| 1225 | { return this->original_size_; } |
| 1226 | |
| 1227 | // Return the stub table. |
| 1228 | The_stub_table* |
| 1229 | stub_table() |
| 1230 | { return stub_table_; } |
| 1231 | |
| 1232 | protected: |
| 1233 | // Write out this input section. |
| 1234 | void |
| 1235 | do_write(Output_file*); |
| 1236 | |
| 1237 | // Return required alignment of this. |
| 1238 | uint64_t |
| 1239 | do_addralign() const |
| 1240 | { |
| 1241 | if (this->is_stub_table_owner()) |
| 1242 | return std::max(this->stub_table_->addralign(), |
| 1243 | static_cast<uint64_t>(this->original_addralign_)); |
| 1244 | else |
| 1245 | return this->original_addralign_; |
| 1246 | } |
| 1247 | |
| 1248 | // Finalize data size. |
| 1249 | void |
| 1250 | set_final_data_size(); |
| 1251 | |
| 1252 | // Reset address and file offset. |
| 1253 | void |
| 1254 | do_reset_address_and_file_offset(); |
| 1255 | |
| 1256 | // Output offset. |
| 1257 | bool |
| 1258 | do_output_offset(const Relobj* object, unsigned int shndx, |
| 1259 | section_offset_type offset, |
| 1260 | section_offset_type* poutput) const |
| 1261 | { |
| 1262 | if ((object == this->relobj()) |
| 1263 | && (shndx == this->shndx()) |
| 1264 | && (offset >= 0) |
| 1265 | && (offset <= |
| 1266 | convert_types<section_offset_type, uint32_t>(this->original_size_))) |
| 1267 | { |
| 1268 | *poutput = offset; |
| 1269 | return true; |
| 1270 | } |
| 1271 | else |
| 1272 | return false; |
| 1273 | } |
| 1274 | |
| 1275 | private: |
| 1276 | // Copying is not allowed. |
| 1277 | AArch64_input_section(const AArch64_input_section&); |
| 1278 | AArch64_input_section& operator=(const AArch64_input_section&); |
| 1279 | |
| 1280 | // The relocation stubs. |
| 1281 | The_stub_table* stub_table_; |
| 1282 | // Original section contents. We have to make a copy here since the file |
| 1283 | // containing the original section may not be locked when we need to access |
| 1284 | // the contents. |
| 1285 | unsigned char* original_contents_; |
| 1286 | // Section size of the original input section. |
| 1287 | uint32_t original_size_; |
| 1288 | // Address alignment of the original input section. |
| 1289 | uint32_t original_addralign_; |
| 1290 | }; // End of AArch64_input_section |
| 1291 | |
| 1292 | |
| 1293 | // Finalize data size. |
| 1294 | |
| 1295 | template<int size, bool big_endian> |
| 1296 | void |
| 1297 | AArch64_input_section<size, big_endian>::set_final_data_size() |
| 1298 | { |
| 1299 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); |
| 1300 | |
| 1301 | if (this->is_stub_table_owner()) |
| 1302 | { |
| 1303 | this->stub_table_->finalize_data_size(); |
| 1304 | off = align_address(off, this->stub_table_->addralign()); |
| 1305 | off += this->stub_table_->data_size(); |
| 1306 | } |
| 1307 | this->set_data_size(off); |
| 1308 | } |
| 1309 | |
| 1310 | |
| 1311 | // Reset address and file offset. |
| 1312 | |
| 1313 | template<int size, bool big_endian> |
| 1314 | void |
| 1315 | AArch64_input_section<size, big_endian>::do_reset_address_and_file_offset() |
| 1316 | { |
| 1317 | // Size of the original input section contents. |
| 1318 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); |
| 1319 | |
| 1320 | // If this is a stub table owner, account for the stub table size. |
| 1321 | if (this->is_stub_table_owner()) |
| 1322 | { |
| 1323 | The_stub_table* stub_table = this->stub_table_; |
| 1324 | |
| 1325 | // Reset the stub table's address and file offset. The |
| 1326 | // current data size for child will be updated after that. |
| 1327 | stub_table_->reset_address_and_file_offset(); |
| 1328 | off = align_address(off, stub_table_->addralign()); |
| 1329 | off += stub_table->current_data_size(); |
| 1330 | } |
| 1331 | |
| 1332 | this->set_current_data_size(off); |
| 1333 | } |
| 1334 | |
| 1335 | |
| 1336 | // Initialize an Arm_input_section. |
| 1337 | |
| 1338 | template<int size, bool big_endian> |
| 1339 | void |
| 1340 | AArch64_input_section<size, big_endian>::init() |
| 1341 | { |
| 1342 | Relobj* relobj = this->relobj(); |
| 1343 | unsigned int shndx = this->shndx(); |
| 1344 | |
| 1345 | // We have to cache original size, alignment and contents to avoid locking |
| 1346 | // the original file. |
| 1347 | this->original_addralign_ = |
| 1348 | convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx)); |
| 1349 | |
| 1350 | // This is not efficient but we expect only a small number of relaxed |
| 1351 | // input sections for stubs. |
| 1352 | section_size_type section_size; |
| 1353 | const unsigned char* section_contents = |
| 1354 | relobj->section_contents(shndx, §ion_size, false); |
| 1355 | this->original_size_ = |
| 1356 | convert_types<uint32_t, uint64_t>(relobj->section_size(shndx)); |
| 1357 | |
| 1358 | gold_assert(this->original_contents_ == NULL); |
| 1359 | this->original_contents_ = new unsigned char[section_size]; |
| 1360 | memcpy(this->original_contents_, section_contents, section_size); |
| 1361 | |
| 1362 | // We want to make this look like the original input section after |
| 1363 | // output sections are finalized. |
| 1364 | Output_section* os = relobj->output_section(shndx); |
| 1365 | off_t offset = relobj->output_section_offset(shndx); |
| 1366 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); |
| 1367 | this->set_address(os->address() + offset); |
| 1368 | this->set_file_offset(os->offset() + offset); |
| 1369 | this->set_current_data_size(this->original_size_); |
| 1370 | this->finalize_data_size(); |
| 1371 | } |
| 1372 | |
| 1373 | |
| 1374 | // Write data to output file. |
| 1375 | |
| 1376 | template<int size, bool big_endian> |
| 1377 | void |
| 1378 | AArch64_input_section<size, big_endian>::do_write(Output_file* of) |
| 1379 | { |
| 1380 | // We have to write out the original section content. |
| 1381 | gold_assert(this->original_contents_ != NULL); |
| 1382 | of->write(this->offset(), this->original_contents_, |
| 1383 | this->original_size_); |
| 1384 | |
| 1385 | // If this owns a stub table and it is not empty, write it. |
| 1386 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) |
| 1387 | this->stub_table_->write(of); |
| 1388 | } |
| 1389 | |
| 1390 | |
| 1391 | // Arm output section class. This is defined mainly to add a number of stub |
| 1392 | // generation methods. |
| 1393 | |
| 1394 | template<int size, bool big_endian> |
| 1395 | class AArch64_output_section : public Output_section |
| 1396 | { |
| 1397 | public: |
| 1398 | typedef Target_aarch64<size, big_endian> The_target_aarch64; |
| 1399 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 1400 | typedef Stub_table<size, big_endian> The_stub_table; |
| 1401 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 1402 | |
| 1403 | public: |
| 1404 | AArch64_output_section(const char* name, elfcpp::Elf_Word type, |
| 1405 | elfcpp::Elf_Xword flags) |
| 1406 | : Output_section(name, type, flags) |
| 1407 | { } |
| 1408 | |
| 1409 | ~AArch64_output_section() {} |
| 1410 | |
| 1411 | // Group input sections for stub generation. |
| 1412 | void |
| 1413 | group_sections(section_size_type, bool, Target_aarch64<size, big_endian>*, |
| 1414 | const Task*); |
| 1415 | |
| 1416 | private: |
| 1417 | typedef Output_section::Input_section Input_section; |
| 1418 | typedef Output_section::Input_section_list Input_section_list; |
| 1419 | |
| 1420 | // Create a stub group. |
| 1421 | void |
| 1422 | create_stub_group(Input_section_list::const_iterator, |
| 1423 | Input_section_list::const_iterator, |
| 1424 | Input_section_list::const_iterator, |
| 1425 | The_target_aarch64*, |
| 1426 | std::vector<Output_relaxed_input_section*>&, |
| 1427 | const Task*); |
| 1428 | }; // End of AArch64_output_section |
| 1429 | |
| 1430 | |
| 1431 | // Create a stub group for input sections from FIRST to LAST. OWNER points to |
| 1432 | // the input section that will be the owner of the stub table. |
| 1433 | |
| 1434 | template<int size, bool big_endian> void |
| 1435 | AArch64_output_section<size, big_endian>::create_stub_group( |
| 1436 | Input_section_list::const_iterator first, |
| 1437 | Input_section_list::const_iterator last, |
| 1438 | Input_section_list::const_iterator owner, |
| 1439 | The_target_aarch64* target, |
| 1440 | std::vector<Output_relaxed_input_section*>& new_relaxed_sections, |
| 1441 | const Task* task) |
| 1442 | { |
| 1443 | // Currently we convert ordinary input sections into relaxed sections only |
| 1444 | // at this point. |
| 1445 | The_aarch64_input_section* input_section; |
| 1446 | if (owner->is_relaxed_input_section()) |
| 1447 | gold_unreachable(); |
| 1448 | else |
| 1449 | { |
| 1450 | gold_assert(owner->is_input_section()); |
| 1451 | // Create a new relaxed input section. We need to lock the original |
| 1452 | // file. |
| 1453 | Task_lock_obj<Object> tl(task, owner->relobj()); |
| 1454 | input_section = |
| 1455 | target->new_aarch64_input_section(owner->relobj(), owner->shndx()); |
| 1456 | new_relaxed_sections.push_back(input_section); |
| 1457 | } |
| 1458 | |
| 1459 | // Create a stub table. |
| 1460 | The_stub_table* stub_table = |
| 1461 | target->new_stub_table(input_section); |
| 1462 | |
| 1463 | input_section->set_stub_table(stub_table); |
| 1464 | |
| 1465 | Input_section_list::const_iterator p = first; |
| 1466 | // Look for input sections or relaxed input sections in [first ... last]. |
| 1467 | do |
| 1468 | { |
| 1469 | if (p->is_input_section() || p->is_relaxed_input_section()) |
| 1470 | { |
| 1471 | // The stub table information for input sections live |
| 1472 | // in their objects. |
| 1473 | The_aarch64_relobj* aarch64_relobj = |
| 1474 | static_cast<The_aarch64_relobj*>(p->relobj()); |
| 1475 | aarch64_relobj->set_stub_table(p->shndx(), stub_table); |
| 1476 | } |
| 1477 | } |
| 1478 | while (p++ != last); |
| 1479 | } |
| 1480 | |
| 1481 | |
| 1482 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit of |
| 1483 | // stub groups. We grow a stub group by adding input section until the size is |
| 1484 | // just below GROUP_SIZE. The last input section will be converted into a stub |
| 1485 | // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond |
| 1486 | // after the stub table, effectively doubling the group size. |
| 1487 | // |
| 1488 | // This is similar to the group_sections() function in elf32-arm.c but is |
| 1489 | // implemented differently. |
| 1490 | |
| 1491 | template<int size, bool big_endian> |
| 1492 | void AArch64_output_section<size, big_endian>::group_sections( |
| 1493 | section_size_type group_size, |
| 1494 | bool stubs_always_after_branch, |
| 1495 | Target_aarch64<size, big_endian>* target, |
| 1496 | const Task* task) |
| 1497 | { |
| 1498 | typedef enum |
| 1499 | { |
| 1500 | NO_GROUP, |
| 1501 | FINDING_STUB_SECTION, |
| 1502 | HAS_STUB_SECTION |
| 1503 | } State; |
| 1504 | |
| 1505 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; |
| 1506 | |
| 1507 | State state = NO_GROUP; |
| 1508 | section_size_type off = 0; |
| 1509 | section_size_type group_begin_offset = 0; |
| 1510 | section_size_type group_end_offset = 0; |
| 1511 | section_size_type stub_table_end_offset = 0; |
| 1512 | Input_section_list::const_iterator group_begin = |
| 1513 | this->input_sections().end(); |
| 1514 | Input_section_list::const_iterator stub_table = |
| 1515 | this->input_sections().end(); |
| 1516 | Input_section_list::const_iterator group_end = this->input_sections().end(); |
| 1517 | for (Input_section_list::const_iterator p = this->input_sections().begin(); |
| 1518 | p != this->input_sections().end(); |
| 1519 | ++p) |
| 1520 | { |
| 1521 | section_size_type section_begin_offset = |
| 1522 | align_address(off, p->addralign()); |
| 1523 | section_size_type section_end_offset = |
| 1524 | section_begin_offset + p->data_size(); |
| 1525 | |
| 1526 | // Check to see if we should group the previously seen sections. |
| 1527 | switch (state) |
| 1528 | { |
| 1529 | case NO_GROUP: |
| 1530 | break; |
| 1531 | |
| 1532 | case FINDING_STUB_SECTION: |
| 1533 | // Adding this section makes the group larger than GROUP_SIZE. |
| 1534 | if (section_end_offset - group_begin_offset >= group_size) |
| 1535 | { |
| 1536 | if (stubs_always_after_branch) |
| 1537 | { |
| 1538 | gold_assert(group_end != this->input_sections().end()); |
| 1539 | this->create_stub_group(group_begin, group_end, group_end, |
| 1540 | target, new_relaxed_sections, |
| 1541 | task); |
| 1542 | state = NO_GROUP; |
| 1543 | } |
| 1544 | else |
| 1545 | { |
| 1546 | // Input sections up to stub_group_size bytes after the stub |
| 1547 | // table can be handled by it too. |
| 1548 | state = HAS_STUB_SECTION; |
| 1549 | stub_table = group_end; |
| 1550 | stub_table_end_offset = group_end_offset; |
| 1551 | } |
| 1552 | } |
| 1553 | break; |
| 1554 | |
| 1555 | case HAS_STUB_SECTION: |
| 1556 | // Adding this section makes the post stub-section group larger |
| 1557 | // than GROUP_SIZE. |
| 1558 | gold_unreachable(); |
| 1559 | // NOT SUPPORTED YET. For completeness only. |
| 1560 | if (section_end_offset - stub_table_end_offset >= group_size) |
| 1561 | { |
| 1562 | gold_assert(group_end != this->input_sections().end()); |
| 1563 | this->create_stub_group(group_begin, group_end, stub_table, |
| 1564 | target, new_relaxed_sections, task); |
| 1565 | state = NO_GROUP; |
| 1566 | } |
| 1567 | break; |
| 1568 | |
| 1569 | default: |
| 1570 | gold_unreachable(); |
| 1571 | } |
| 1572 | |
| 1573 | // If we see an input section and currently there is no group, start |
| 1574 | // a new one. Skip any empty sections. We look at the data size |
| 1575 | // instead of calling p->relobj()->section_size() to avoid locking. |
| 1576 | if ((p->is_input_section() || p->is_relaxed_input_section()) |
| 1577 | && (p->data_size() != 0)) |
| 1578 | { |
| 1579 | if (state == NO_GROUP) |
| 1580 | { |
| 1581 | state = FINDING_STUB_SECTION; |
| 1582 | group_begin = p; |
| 1583 | group_begin_offset = section_begin_offset; |
| 1584 | } |
| 1585 | |
| 1586 | // Keep track of the last input section seen. |
| 1587 | group_end = p; |
| 1588 | group_end_offset = section_end_offset; |
| 1589 | } |
| 1590 | |
| 1591 | off = section_end_offset; |
| 1592 | } |
| 1593 | |
| 1594 | // Create a stub group for any ungrouped sections. |
| 1595 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) |
| 1596 | { |
| 1597 | gold_assert(group_end != this->input_sections().end()); |
| 1598 | this->create_stub_group(group_begin, group_end, |
| 1599 | (state == FINDING_STUB_SECTION |
| 1600 | ? group_end |
| 1601 | : stub_table), |
| 1602 | target, new_relaxed_sections, task); |
| 1603 | } |
| 1604 | |
| 1605 | if (!new_relaxed_sections.empty()) |
| 1606 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); |
| 1607 | |
| 1608 | // Update the section offsets |
| 1609 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) |
| 1610 | { |
| 1611 | The_aarch64_relobj* relobj = static_cast<The_aarch64_relobj*>( |
| 1612 | new_relaxed_sections[i]->relobj()); |
| 1613 | unsigned int shndx = new_relaxed_sections[i]->shndx(); |
| 1614 | // Tell AArch64_relobj that this input section is converted. |
| 1615 | relobj->convert_input_section_to_relaxed_section(shndx); |
| 1616 | } |
| 1617 | } // End of AArch64_output_section::group_sections |
| 1618 | |
| 1619 | |
| 1620 | AArch64_reloc_property_table* aarch64_reloc_property_table = NULL; |
| 1621 | |
| 1622 | |
| 1623 | // The aarch64 target class. |
| 1624 | // See the ABI at |
| 1625 | // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf |
| 1626 | template<int size, bool big_endian> |
| 1627 | class Target_aarch64 : public Sized_target<size, big_endian> |
| 1628 | { |
| 1629 | public: |
| 1630 | typedef Target_aarch64<size, big_endian> This; |
| 1631 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 1632 | Reloc_section; |
| 1633 | typedef Relocate_info<size, big_endian> The_relocate_info; |
| 1634 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1635 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 1636 | typedef Reloc_stub<size, big_endian> The_reloc_stub; |
| 1637 | typedef typename The_reloc_stub::Stub_type The_reloc_stub_type; |
| 1638 | typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key; |
| 1639 | typedef Stub_table<size, big_endian> The_stub_table; |
| 1640 | typedef std::vector<The_stub_table*> Stub_table_list; |
| 1641 | typedef typename Stub_table_list::iterator Stub_table_iterator; |
| 1642 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 1643 | typedef AArch64_output_section<size, big_endian> The_aarch64_output_section; |
| 1644 | typedef Unordered_map<Section_id, |
| 1645 | AArch64_input_section<size, big_endian>*, |
| 1646 | Section_id_hash> AArch64_input_section_map; |
| 1647 | const static int TCB_SIZE = size / 8 * 2; |
| 1648 | |
| 1649 | Target_aarch64(const Target::Target_info* info = &aarch64_info) |
| 1650 | : Sized_target<size, big_endian>(info), |
| 1651 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
| 1652 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), |
| 1653 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY), |
| 1654 | got_mod_index_offset_(-1U), |
| 1655 | tlsdesc_reloc_info_(), tls_base_symbol_defined_(false), |
| 1656 | stub_tables_(), stub_group_size_(0), aarch64_input_section_map_() |
| 1657 | { } |
| 1658 | |
| 1659 | // Scan the relocations to determine unreferenced sections for |
| 1660 | // garbage collection. |
| 1661 | void |
| 1662 | gc_process_relocs(Symbol_table* symtab, |
| 1663 | Layout* layout, |
| 1664 | Sized_relobj_file<size, big_endian>* object, |
| 1665 | unsigned int data_shndx, |
| 1666 | unsigned int sh_type, |
| 1667 | const unsigned char* prelocs, |
| 1668 | size_t reloc_count, |
| 1669 | Output_section* output_section, |
| 1670 | bool needs_special_offset_handling, |
| 1671 | size_t local_symbol_count, |
| 1672 | const unsigned char* plocal_symbols); |
| 1673 | |
| 1674 | // Scan the relocations to look for symbol adjustments. |
| 1675 | void |
| 1676 | scan_relocs(Symbol_table* symtab, |
| 1677 | Layout* layout, |
| 1678 | Sized_relobj_file<size, big_endian>* object, |
| 1679 | unsigned int data_shndx, |
| 1680 | unsigned int sh_type, |
| 1681 | const unsigned char* prelocs, |
| 1682 | size_t reloc_count, |
| 1683 | Output_section* output_section, |
| 1684 | bool needs_special_offset_handling, |
| 1685 | size_t local_symbol_count, |
| 1686 | const unsigned char* plocal_symbols); |
| 1687 | |
| 1688 | // Finalize the sections. |
| 1689 | void |
| 1690 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
| 1691 | |
| 1692 | // Return the value to use for a dynamic which requires special |
| 1693 | // treatment. |
| 1694 | uint64_t |
| 1695 | do_dynsym_value(const Symbol*) const; |
| 1696 | |
| 1697 | // Relocate a section. |
| 1698 | void |
| 1699 | relocate_section(const Relocate_info<size, big_endian>*, |
| 1700 | unsigned int sh_type, |
| 1701 | const unsigned char* prelocs, |
| 1702 | size_t reloc_count, |
| 1703 | Output_section* output_section, |
| 1704 | bool needs_special_offset_handling, |
| 1705 | unsigned char* view, |
| 1706 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 1707 | section_size_type view_size, |
| 1708 | const Reloc_symbol_changes*); |
| 1709 | |
| 1710 | // Scan the relocs during a relocatable link. |
| 1711 | void |
| 1712 | scan_relocatable_relocs(Symbol_table* symtab, |
| 1713 | Layout* layout, |
| 1714 | Sized_relobj_file<size, big_endian>* object, |
| 1715 | unsigned int data_shndx, |
| 1716 | unsigned int sh_type, |
| 1717 | const unsigned char* prelocs, |
| 1718 | size_t reloc_count, |
| 1719 | Output_section* output_section, |
| 1720 | bool needs_special_offset_handling, |
| 1721 | size_t local_symbol_count, |
| 1722 | const unsigned char* plocal_symbols, |
| 1723 | Relocatable_relocs*); |
| 1724 | |
| 1725 | // Relocate a section during a relocatable link. |
| 1726 | void |
| 1727 | relocate_relocs( |
| 1728 | const Relocate_info<size, big_endian>*, |
| 1729 | unsigned int sh_type, |
| 1730 | const unsigned char* prelocs, |
| 1731 | size_t reloc_count, |
| 1732 | Output_section* output_section, |
| 1733 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 1734 | const Relocatable_relocs*, |
| 1735 | unsigned char* view, |
| 1736 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 1737 | section_size_type view_size, |
| 1738 | unsigned char* reloc_view, |
| 1739 | section_size_type reloc_view_size); |
| 1740 | |
| 1741 | // Return the symbol index to use for a target specific relocation. |
| 1742 | // The only target specific relocation is R_AARCH64_TLSDESC for a |
| 1743 | // local symbol, which is an absolute reloc. |
| 1744 | unsigned int |
| 1745 | do_reloc_symbol_index(void*, unsigned int r_type) const |
| 1746 | { |
| 1747 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); |
| 1748 | return 0; |
| 1749 | } |
| 1750 | |
| 1751 | // Return the addend to use for a target specific relocation. |
| 1752 | uint64_t |
| 1753 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; |
| 1754 | |
| 1755 | // Return the PLT section. |
| 1756 | uint64_t |
| 1757 | do_plt_address_for_global(const Symbol* gsym) const |
| 1758 | { return this->plt_section()->address_for_global(gsym); } |
| 1759 | |
| 1760 | uint64_t |
| 1761 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const |
| 1762 | { return this->plt_section()->address_for_local(relobj, symndx); } |
| 1763 | |
| 1764 | // This function should be defined in targets that can use relocation |
| 1765 | // types to determine (implemented in local_reloc_may_be_function_pointer |
| 1766 | // and global_reloc_may_be_function_pointer) |
| 1767 | // if a function's pointer is taken. ICF uses this in safe mode to only |
| 1768 | // fold those functions whose pointer is defintely not taken. |
| 1769 | bool |
| 1770 | do_can_check_for_function_pointers() const |
| 1771 | { return true; } |
| 1772 | |
| 1773 | // Return the number of entries in the PLT. |
| 1774 | unsigned int |
| 1775 | plt_entry_count() const; |
| 1776 | |
| 1777 | //Return the offset of the first non-reserved PLT entry. |
| 1778 | unsigned int |
| 1779 | first_plt_entry_offset() const; |
| 1780 | |
| 1781 | // Return the size of each PLT entry. |
| 1782 | unsigned int |
| 1783 | plt_entry_size() const; |
| 1784 | |
| 1785 | // Create a stub table. |
| 1786 | The_stub_table* |
| 1787 | new_stub_table(The_aarch64_input_section*); |
| 1788 | |
| 1789 | // Create an aarch64 input section. |
| 1790 | The_aarch64_input_section* |
| 1791 | new_aarch64_input_section(Relobj*, unsigned int); |
| 1792 | |
| 1793 | // Find an aarch64 input section instance for a given OBJ and SHNDX. |
| 1794 | The_aarch64_input_section* |
| 1795 | find_aarch64_input_section(Relobj*, unsigned int) const; |
| 1796 | |
| 1797 | // Return the thread control block size. |
| 1798 | unsigned int |
| 1799 | tcb_size() const { return This::TCB_SIZE; } |
| 1800 | |
| 1801 | // Scan a section for stub generation. |
| 1802 | void |
| 1803 | scan_section_for_stubs(const Relocate_info<size, big_endian>*, unsigned int, |
| 1804 | const unsigned char*, size_t, Output_section*, |
| 1805 | bool, const unsigned char*, |
| 1806 | Address, |
| 1807 | section_size_type); |
| 1808 | |
| 1809 | // Scan a relocation section for stub. |
| 1810 | template<int sh_type> |
| 1811 | void |
| 1812 | scan_reloc_section_for_stubs( |
| 1813 | const The_relocate_info* relinfo, |
| 1814 | const unsigned char* prelocs, |
| 1815 | size_t reloc_count, |
| 1816 | Output_section* output_section, |
| 1817 | bool needs_special_offset_handling, |
| 1818 | const unsigned char* view, |
| 1819 | Address view_address, |
| 1820 | section_size_type); |
| 1821 | |
| 1822 | // Relocate a single stub. |
| 1823 | void |
| 1824 | relocate_stub(The_reloc_stub*, const Relocate_info<size, big_endian>*, |
| 1825 | Output_section*, unsigned char*, Address, |
| 1826 | section_size_type); |
| 1827 | |
| 1828 | // Get the default AArch64 target. |
| 1829 | static This* |
| 1830 | current_target() |
| 1831 | { |
| 1832 | gold_assert(parameters->target().machine_code() == elfcpp::EM_AARCH64 |
| 1833 | && parameters->target().get_size() == size |
| 1834 | && parameters->target().is_big_endian() == big_endian); |
| 1835 | return static_cast<This*>(parameters->sized_target<size, big_endian>()); |
| 1836 | } |
| 1837 | |
| 1838 | protected: |
| 1839 | void |
| 1840 | do_select_as_default_target() |
| 1841 | { |
| 1842 | gold_assert(aarch64_reloc_property_table == NULL); |
| 1843 | aarch64_reloc_property_table = new AArch64_reloc_property_table(); |
| 1844 | } |
| 1845 | |
| 1846 | // Add a new reloc argument, returning the index in the vector. |
| 1847 | size_t |
| 1848 | add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object, |
| 1849 | unsigned int r_sym) |
| 1850 | { |
| 1851 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); |
| 1852 | return this->tlsdesc_reloc_info_.size() - 1; |
| 1853 | } |
| 1854 | |
| 1855 | virtual Output_data_plt_aarch64<size, big_endian>* |
| 1856 | do_make_data_plt(Layout* layout, |
| 1857 | Output_data_got_aarch64<size, big_endian>* got, |
| 1858 | Output_data_space* got_plt, |
| 1859 | Output_data_space* got_irelative) |
| 1860 | { |
| 1861 | return new Output_data_plt_aarch64_standard<size, big_endian>( |
| 1862 | layout, got, got_plt, got_irelative); |
| 1863 | } |
| 1864 | |
| 1865 | |
| 1866 | // do_make_elf_object to override the same function in the base class. |
| 1867 | Object* |
| 1868 | do_make_elf_object(const std::string&, Input_file*, off_t, |
| 1869 | const elfcpp::Ehdr<size, big_endian>&); |
| 1870 | |
| 1871 | Output_data_plt_aarch64<size, big_endian>* |
| 1872 | make_data_plt(Layout* layout, |
| 1873 | Output_data_got_aarch64<size, big_endian>* got, |
| 1874 | Output_data_space* got_plt, |
| 1875 | Output_data_space* got_irelative) |
| 1876 | { |
| 1877 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); |
| 1878 | } |
| 1879 | |
| 1880 | // We only need to generate stubs, and hence perform relaxation if we are |
| 1881 | // not doing relocatable linking. |
| 1882 | virtual bool |
| 1883 | do_may_relax() const |
| 1884 | { return !parameters->options().relocatable(); } |
| 1885 | |
| 1886 | // Relaxation hook. This is where we do stub generation. |
| 1887 | virtual bool |
| 1888 | do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*); |
| 1889 | |
| 1890 | void |
| 1891 | group_sections(Layout* layout, |
| 1892 | section_size_type group_size, |
| 1893 | bool stubs_always_after_branch, |
| 1894 | const Task* task); |
| 1895 | |
| 1896 | void |
| 1897 | scan_reloc_for_stub(const The_relocate_info*, unsigned int, |
| 1898 | const Sized_symbol<size>*, unsigned int, |
| 1899 | const Symbol_value<size>*, |
| 1900 | typename elfcpp::Elf_types<size>::Elf_Swxword, |
| 1901 | Address Elf_Addr); |
| 1902 | |
| 1903 | // Make an output section. |
| 1904 | Output_section* |
| 1905 | do_make_output_section(const char* name, elfcpp::Elf_Word type, |
| 1906 | elfcpp::Elf_Xword flags) |
| 1907 | { return new The_aarch64_output_section(name, type, flags); } |
| 1908 | |
| 1909 | private: |
| 1910 | // The class which scans relocations. |
| 1911 | class Scan |
| 1912 | { |
| 1913 | public: |
| 1914 | Scan() |
| 1915 | : issued_non_pic_error_(false) |
| 1916 | { } |
| 1917 | |
| 1918 | inline void |
| 1919 | local(Symbol_table* symtab, Layout* layout, Target_aarch64* target, |
| 1920 | Sized_relobj_file<size, big_endian>* object, |
| 1921 | unsigned int data_shndx, |
| 1922 | Output_section* output_section, |
| 1923 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 1924 | const elfcpp::Sym<size, big_endian>& lsym, |
| 1925 | bool is_discarded); |
| 1926 | |
| 1927 | inline void |
| 1928 | global(Symbol_table* symtab, Layout* layout, Target_aarch64* target, |
| 1929 | Sized_relobj_file<size, big_endian>* object, |
| 1930 | unsigned int data_shndx, |
| 1931 | Output_section* output_section, |
| 1932 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 1933 | Symbol* gsym); |
| 1934 | |
| 1935 | inline bool |
| 1936 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 1937 | Target_aarch64<size, big_endian>* , |
| 1938 | Sized_relobj_file<size, big_endian>* , |
| 1939 | unsigned int , |
| 1940 | Output_section* , |
| 1941 | const elfcpp::Rela<size, big_endian>& , |
| 1942 | unsigned int r_type, |
| 1943 | const elfcpp::Sym<size, big_endian>&); |
| 1944 | |
| 1945 | inline bool |
| 1946 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 1947 | Target_aarch64<size, big_endian>* , |
| 1948 | Sized_relobj_file<size, big_endian>* , |
| 1949 | unsigned int , |
| 1950 | Output_section* , |
| 1951 | const elfcpp::Rela<size, big_endian>& , |
| 1952 | unsigned int r_type, |
| 1953 | Symbol* gsym); |
| 1954 | |
| 1955 | private: |
| 1956 | static void |
| 1957 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, |
| 1958 | unsigned int r_type); |
| 1959 | |
| 1960 | static void |
| 1961 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, |
| 1962 | unsigned int r_type, Symbol*); |
| 1963 | |
| 1964 | inline bool |
| 1965 | possible_function_pointer_reloc(unsigned int r_type); |
| 1966 | |
| 1967 | void |
| 1968 | check_non_pic(Relobj*, unsigned int r_type); |
| 1969 | |
| 1970 | bool |
| 1971 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>*, |
| 1972 | unsigned int r_type); |
| 1973 | |
| 1974 | // Whether we have issued an error about a non-PIC compilation. |
| 1975 | bool issued_non_pic_error_; |
| 1976 | }; |
| 1977 | |
| 1978 | // The class which implements relocation. |
| 1979 | class Relocate |
| 1980 | { |
| 1981 | public: |
| 1982 | Relocate() |
| 1983 | : skip_call_tls_get_addr_(false) |
| 1984 | { } |
| 1985 | |
| 1986 | ~Relocate() |
| 1987 | { } |
| 1988 | |
| 1989 | // Do a relocation. Return false if the caller should not issue |
| 1990 | // any warnings about this relocation. |
| 1991 | inline bool |
| 1992 | relocate(const Relocate_info<size, big_endian>*, Target_aarch64*, |
| 1993 | Output_section*, |
| 1994 | size_t relnum, const elfcpp::Rela<size, big_endian>&, |
| 1995 | unsigned int r_type, const Sized_symbol<size>*, |
| 1996 | const Symbol_value<size>*, |
| 1997 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
| 1998 | section_size_type); |
| 1999 | |
| 2000 | private: |
| 2001 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 2002 | relocate_tls(const Relocate_info<size, big_endian>*, |
| 2003 | Target_aarch64<size, big_endian>*, |
| 2004 | size_t, |
| 2005 | const elfcpp::Rela<size, big_endian>&, |
| 2006 | unsigned int r_type, const Sized_symbol<size>*, |
| 2007 | const Symbol_value<size>*, |
| 2008 | unsigned char*, |
| 2009 | typename elfcpp::Elf_types<size>::Elf_Addr); |
| 2010 | |
| 2011 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 2012 | tls_gd_to_le( |
| 2013 | const Relocate_info<size, big_endian>*, |
| 2014 | Target_aarch64<size, big_endian>*, |
| 2015 | const elfcpp::Rela<size, big_endian>&, |
| 2016 | unsigned int, |
| 2017 | unsigned char*, |
| 2018 | const Symbol_value<size>*); |
| 2019 | |
| 2020 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 2021 | tls_ld_to_le( |
| 2022 | const Relocate_info<size, big_endian>*, |
| 2023 | Target_aarch64<size, big_endian>*, |
| 2024 | const elfcpp::Rela<size, big_endian>&, |
| 2025 | unsigned int, |
| 2026 | unsigned char*, |
| 2027 | const Symbol_value<size>*); |
| 2028 | |
| 2029 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 2030 | tls_ie_to_le( |
| 2031 | const Relocate_info<size, big_endian>*, |
| 2032 | Target_aarch64<size, big_endian>*, |
| 2033 | const elfcpp::Rela<size, big_endian>&, |
| 2034 | unsigned int, |
| 2035 | unsigned char*, |
| 2036 | const Symbol_value<size>*); |
| 2037 | |
| 2038 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 2039 | tls_desc_gd_to_le( |
| 2040 | const Relocate_info<size, big_endian>*, |
| 2041 | Target_aarch64<size, big_endian>*, |
| 2042 | const elfcpp::Rela<size, big_endian>&, |
| 2043 | unsigned int, |
| 2044 | unsigned char*, |
| 2045 | const Symbol_value<size>*); |
| 2046 | |
| 2047 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 2048 | tls_desc_gd_to_ie( |
| 2049 | const Relocate_info<size, big_endian>*, |
| 2050 | Target_aarch64<size, big_endian>*, |
| 2051 | const elfcpp::Rela<size, big_endian>&, |
| 2052 | unsigned int, |
| 2053 | unsigned char*, |
| 2054 | const Symbol_value<size>*, |
| 2055 | typename elfcpp::Elf_types<size>::Elf_Addr, |
| 2056 | typename elfcpp::Elf_types<size>::Elf_Addr); |
| 2057 | |
| 2058 | bool skip_call_tls_get_addr_; |
| 2059 | |
| 2060 | }; // End of class Relocate |
| 2061 | |
| 2062 | // A class which returns the size required for a relocation type, |
| 2063 | // used while scanning relocs during a relocatable link. |
| 2064 | class Relocatable_size_for_reloc |
| 2065 | { |
| 2066 | public: |
| 2067 | unsigned int |
| 2068 | get_size_for_reloc(unsigned int, Relobj*); |
| 2069 | }; |
| 2070 | |
| 2071 | // Adjust TLS relocation type based on the options and whether this |
| 2072 | // is a local symbol. |
| 2073 | static tls::Tls_optimization |
| 2074 | optimize_tls_reloc(bool is_final, int r_type); |
| 2075 | |
| 2076 | // Get the GOT section, creating it if necessary. |
| 2077 | Output_data_got_aarch64<size, big_endian>* |
| 2078 | got_section(Symbol_table*, Layout*); |
| 2079 | |
| 2080 | // Get the GOT PLT section. |
| 2081 | Output_data_space* |
| 2082 | got_plt_section() const |
| 2083 | { |
| 2084 | gold_assert(this->got_plt_ != NULL); |
| 2085 | return this->got_plt_; |
| 2086 | } |
| 2087 | |
| 2088 | // Get the GOT section for TLSDESC entries. |
| 2089 | Output_data_got<size, big_endian>* |
| 2090 | got_tlsdesc_section() const |
| 2091 | { |
| 2092 | gold_assert(this->got_tlsdesc_ != NULL); |
| 2093 | return this->got_tlsdesc_; |
| 2094 | } |
| 2095 | |
| 2096 | // Create the PLT section. |
| 2097 | void |
| 2098 | make_plt_section(Symbol_table* symtab, Layout* layout); |
| 2099 | |
| 2100 | // Create a PLT entry for a global symbol. |
| 2101 | void |
| 2102 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
| 2103 | |
| 2104 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
| 2105 | void |
| 2106 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, |
| 2107 | Sized_relobj_file<size, big_endian>* relobj, |
| 2108 | unsigned int local_sym_index); |
| 2109 | |
| 2110 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
| 2111 | void |
| 2112 | define_tls_base_symbol(Symbol_table*, Layout*); |
| 2113 | |
| 2114 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
| 2115 | void |
| 2116 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); |
| 2117 | |
| 2118 | // Create a GOT entry for the TLS module index. |
| 2119 | unsigned int |
| 2120 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
| 2121 | Sized_relobj_file<size, big_endian>* object); |
| 2122 | |
| 2123 | // Get the PLT section. |
| 2124 | Output_data_plt_aarch64<size, big_endian>* |
| 2125 | plt_section() const |
| 2126 | { |
| 2127 | gold_assert(this->plt_ != NULL); |
| 2128 | return this->plt_; |
| 2129 | } |
| 2130 | |
| 2131 | // Get the dynamic reloc section, creating it if necessary. |
| 2132 | Reloc_section* |
| 2133 | rela_dyn_section(Layout*); |
| 2134 | |
| 2135 | // Get the section to use for TLSDESC relocations. |
| 2136 | Reloc_section* |
| 2137 | rela_tlsdesc_section(Layout*) const; |
| 2138 | |
| 2139 | // Get the section to use for IRELATIVE relocations. |
| 2140 | Reloc_section* |
| 2141 | rela_irelative_section(Layout*); |
| 2142 | |
| 2143 | // Add a potential copy relocation. |
| 2144 | void |
| 2145 | copy_reloc(Symbol_table* symtab, Layout* layout, |
| 2146 | Sized_relobj_file<size, big_endian>* object, |
| 2147 | unsigned int shndx, Output_section* output_section, |
| 2148 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) |
| 2149 | { |
| 2150 | this->copy_relocs_.copy_reloc(symtab, layout, |
| 2151 | symtab->get_sized_symbol<size>(sym), |
| 2152 | object, shndx, output_section, |
| 2153 | reloc, this->rela_dyn_section(layout)); |
| 2154 | } |
| 2155 | |
| 2156 | // Information about this specific target which we pass to the |
| 2157 | // general Target structure. |
| 2158 | static const Target::Target_info aarch64_info; |
| 2159 | |
| 2160 | // The types of GOT entries needed for this platform. |
| 2161 | // These values are exposed to the ABI in an incremental link. |
| 2162 | // Do not renumber existing values without changing the version |
| 2163 | // number of the .gnu_incremental_inputs section. |
| 2164 | enum Got_type |
| 2165 | { |
| 2166 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol |
| 2167 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset |
| 2168 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair |
| 2169 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair |
| 2170 | }; |
| 2171 | |
| 2172 | // This type is used as the argument to the target specific |
| 2173 | // relocation routines. The only target specific reloc is |
| 2174 | // R_AARCh64_TLSDESC against a local symbol. |
| 2175 | struct Tlsdesc_info |
| 2176 | { |
| 2177 | Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object, |
| 2178 | unsigned int a_r_sym) |
| 2179 | : object(a_object), r_sym(a_r_sym) |
| 2180 | { } |
| 2181 | |
| 2182 | // The object in which the local symbol is defined. |
| 2183 | Sized_relobj_file<size, big_endian>* object; |
| 2184 | // The local symbol index in the object. |
| 2185 | unsigned int r_sym; |
| 2186 | }; |
| 2187 | |
| 2188 | // The GOT section. |
| 2189 | Output_data_got_aarch64<size, big_endian>* got_; |
| 2190 | // The PLT section. |
| 2191 | Output_data_plt_aarch64<size, big_endian>* plt_; |
| 2192 | // The GOT PLT section. |
| 2193 | Output_data_space* got_plt_; |
| 2194 | // The GOT section for IRELATIVE relocations. |
| 2195 | Output_data_space* got_irelative_; |
| 2196 | // The GOT section for TLSDESC relocations. |
| 2197 | Output_data_got<size, big_endian>* got_tlsdesc_; |
| 2198 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
| 2199 | Symbol* global_offset_table_; |
| 2200 | // The dynamic reloc section. |
| 2201 | Reloc_section* rela_dyn_; |
| 2202 | // The section to use for IRELATIVE relocs. |
| 2203 | Reloc_section* rela_irelative_; |
| 2204 | // Relocs saved to avoid a COPY reloc. |
| 2205 | Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; |
| 2206 | // Offset of the GOT entry for the TLS module index. |
| 2207 | unsigned int got_mod_index_offset_; |
| 2208 | // We handle R_AARCH64_TLSDESC against a local symbol as a target |
| 2209 | // specific relocation. Here we store the object and local symbol |
| 2210 | // index for the relocation. |
| 2211 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; |
| 2212 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
| 2213 | bool tls_base_symbol_defined_; |
| 2214 | // List of stub_tables |
| 2215 | Stub_table_list stub_tables_; |
| 2216 | // Actual stub group size |
| 2217 | section_size_type stub_group_size_; |
| 2218 | AArch64_input_section_map aarch64_input_section_map_; |
| 2219 | }; // End of Target_aarch64 |
| 2220 | |
| 2221 | |
| 2222 | template<> |
| 2223 | const Target::Target_info Target_aarch64<64, false>::aarch64_info = |
| 2224 | { |
| 2225 | 64, // size |
| 2226 | false, // is_big_endian |
| 2227 | elfcpp::EM_AARCH64, // machine_code |
| 2228 | false, // has_make_symbol |
| 2229 | false, // has_resolve |
| 2230 | false, // has_code_fill |
| 2231 | true, // is_default_stack_executable |
| 2232 | true, // can_icf_inline_merge_sections |
| 2233 | '\0', // wrap_char |
| 2234 | "/lib/ld.so.1", // program interpreter |
| 2235 | 0x400000, // default_text_segment_address |
| 2236 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 2237 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 2238 | false, // isolate_execinstr |
| 2239 | 0, // rosegment_gap |
| 2240 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 2241 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 2242 | 0, // small_common_section_flags |
| 2243 | 0, // large_common_section_flags |
| 2244 | NULL, // attributes_section |
| 2245 | NULL, // attributes_vendor |
| 2246 | "_start" // entry_symbol_name |
| 2247 | }; |
| 2248 | |
| 2249 | template<> |
| 2250 | const Target::Target_info Target_aarch64<32, false>::aarch64_info = |
| 2251 | { |
| 2252 | 32, // size |
| 2253 | false, // is_big_endian |
| 2254 | elfcpp::EM_AARCH64, // machine_code |
| 2255 | false, // has_make_symbol |
| 2256 | false, // has_resolve |
| 2257 | false, // has_code_fill |
| 2258 | true, // is_default_stack_executable |
| 2259 | false, // can_icf_inline_merge_sections |
| 2260 | '\0', // wrap_char |
| 2261 | "/lib/ld.so.1", // program interpreter |
| 2262 | 0x400000, // default_text_segment_address |
| 2263 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 2264 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 2265 | false, // isolate_execinstr |
| 2266 | 0, // rosegment_gap |
| 2267 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 2268 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 2269 | 0, // small_common_section_flags |
| 2270 | 0, // large_common_section_flags |
| 2271 | NULL, // attributes_section |
| 2272 | NULL, // attributes_vendor |
| 2273 | "_start" // entry_symbol_name |
| 2274 | }; |
| 2275 | |
| 2276 | template<> |
| 2277 | const Target::Target_info Target_aarch64<64, true>::aarch64_info = |
| 2278 | { |
| 2279 | 64, // size |
| 2280 | true, // is_big_endian |
| 2281 | elfcpp::EM_AARCH64, // machine_code |
| 2282 | false, // has_make_symbol |
| 2283 | false, // has_resolve |
| 2284 | false, // has_code_fill |
| 2285 | true, // is_default_stack_executable |
| 2286 | true, // can_icf_inline_merge_sections |
| 2287 | '\0', // wrap_char |
| 2288 | "/lib/ld.so.1", // program interpreter |
| 2289 | 0x400000, // default_text_segment_address |
| 2290 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 2291 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 2292 | false, // isolate_execinstr |
| 2293 | 0, // rosegment_gap |
| 2294 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 2295 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 2296 | 0, // small_common_section_flags |
| 2297 | 0, // large_common_section_flags |
| 2298 | NULL, // attributes_section |
| 2299 | NULL, // attributes_vendor |
| 2300 | "_start" // entry_symbol_name |
| 2301 | }; |
| 2302 | |
| 2303 | template<> |
| 2304 | const Target::Target_info Target_aarch64<32, true>::aarch64_info = |
| 2305 | { |
| 2306 | 32, // size |
| 2307 | true, // is_big_endian |
| 2308 | elfcpp::EM_AARCH64, // machine_code |
| 2309 | false, // has_make_symbol |
| 2310 | false, // has_resolve |
| 2311 | false, // has_code_fill |
| 2312 | true, // is_default_stack_executable |
| 2313 | false, // can_icf_inline_merge_sections |
| 2314 | '\0', // wrap_char |
| 2315 | "/lib/ld.so.1", // program interpreter |
| 2316 | 0x400000, // default_text_segment_address |
| 2317 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
| 2318 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 2319 | false, // isolate_execinstr |
| 2320 | 0, // rosegment_gap |
| 2321 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 2322 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 2323 | 0, // small_common_section_flags |
| 2324 | 0, // large_common_section_flags |
| 2325 | NULL, // attributes_section |
| 2326 | NULL, // attributes_vendor |
| 2327 | "_start" // entry_symbol_name |
| 2328 | }; |
| 2329 | |
| 2330 | // Get the GOT section, creating it if necessary. |
| 2331 | |
| 2332 | template<int size, bool big_endian> |
| 2333 | Output_data_got_aarch64<size, big_endian>* |
| 2334 | Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab, |
| 2335 | Layout* layout) |
| 2336 | { |
| 2337 | if (this->got_ == NULL) |
| 2338 | { |
| 2339 | gold_assert(symtab != NULL && layout != NULL); |
| 2340 | |
| 2341 | // When using -z now, we can treat .got.plt as a relro section. |
| 2342 | // Without -z now, it is modified after program startup by lazy |
| 2343 | // PLT relocations. |
| 2344 | bool is_got_plt_relro = parameters->options().now(); |
| 2345 | Output_section_order got_order = (is_got_plt_relro |
| 2346 | ? ORDER_RELRO |
| 2347 | : ORDER_RELRO_LAST); |
| 2348 | Output_section_order got_plt_order = (is_got_plt_relro |
| 2349 | ? ORDER_RELRO |
| 2350 | : ORDER_NON_RELRO_FIRST); |
| 2351 | |
| 2352 | // Layout of .got and .got.plt sections. |
| 2353 | // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_ |
| 2354 | // ... |
| 2355 | // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT |
| 2356 | // .gotplt[1] reserved for ld.so (resolver) |
| 2357 | // .gotplt[2] reserved |
| 2358 | |
| 2359 | // Generate .got section. |
| 2360 | this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab, |
| 2361 | layout); |
| 2362 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 2363 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| 2364 | this->got_, got_order, true); |
| 2365 | // The first word of GOT is reserved for the address of .dynamic. |
| 2366 | // We put 0 here now. The value will be replaced later in |
| 2367 | // Output_data_got_aarch64::do_write. |
| 2368 | this->got_->add_constant(0); |
| 2369 | |
| 2370 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
| 2371 | // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section, |
| 2372 | // even if there is a .got.plt section. |
| 2373 | this->global_offset_table_ = |
| 2374 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 2375 | Symbol_table::PREDEFINED, |
| 2376 | this->got_, |
| 2377 | 0, 0, elfcpp::STT_OBJECT, |
| 2378 | elfcpp::STB_LOCAL, |
| 2379 | elfcpp::STV_HIDDEN, 0, |
| 2380 | false, false); |
| 2381 | |
| 2382 | // Generate .got.plt section. |
| 2383 | this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT"); |
| 2384 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| 2385 | (elfcpp::SHF_ALLOC |
| 2386 | | elfcpp::SHF_WRITE), |
| 2387 | this->got_plt_, got_plt_order, |
| 2388 | is_got_plt_relro); |
| 2389 | |
| 2390 | // The first three entries are reserved. |
| 2391 | this->got_plt_->set_current_data_size( |
| 2392 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); |
| 2393 | |
| 2394 | // If there are any IRELATIVE relocations, they get GOT entries |
| 2395 | // in .got.plt after the jump slot entries. |
| 2396 | this->got_irelative_ = new Output_data_space(size / 8, |
| 2397 | "** GOT IRELATIVE PLT"); |
| 2398 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| 2399 | (elfcpp::SHF_ALLOC |
| 2400 | | elfcpp::SHF_WRITE), |
| 2401 | this->got_irelative_, |
| 2402 | got_plt_order, |
| 2403 | is_got_plt_relro); |
| 2404 | |
| 2405 | // If there are any TLSDESC relocations, they get GOT entries in |
| 2406 | // .got.plt after the jump slot and IRELATIVE entries. |
| 2407 | this->got_tlsdesc_ = new Output_data_got<size, big_endian>(); |
| 2408 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| 2409 | (elfcpp::SHF_ALLOC |
| 2410 | | elfcpp::SHF_WRITE), |
| 2411 | this->got_tlsdesc_, |
| 2412 | got_plt_order, |
| 2413 | is_got_plt_relro); |
| 2414 | |
| 2415 | if (!is_got_plt_relro) |
| 2416 | { |
| 2417 | // Those bytes can go into the relro segment. |
| 2418 | layout->increase_relro( |
| 2419 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); |
| 2420 | } |
| 2421 | |
| 2422 | } |
| 2423 | return this->got_; |
| 2424 | } |
| 2425 | |
| 2426 | // Get the dynamic reloc section, creating it if necessary. |
| 2427 | |
| 2428 | template<int size, bool big_endian> |
| 2429 | typename Target_aarch64<size, big_endian>::Reloc_section* |
| 2430 | Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout) |
| 2431 | { |
| 2432 | if (this->rela_dyn_ == NULL) |
| 2433 | { |
| 2434 | gold_assert(layout != NULL); |
| 2435 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| 2436 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 2437 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
| 2438 | ORDER_DYNAMIC_RELOCS, false); |
| 2439 | } |
| 2440 | return this->rela_dyn_; |
| 2441 | } |
| 2442 | |
| 2443 | // Get the section to use for IRELATIVE relocs, creating it if |
| 2444 | // necessary. These go in .rela.dyn, but only after all other dynamic |
| 2445 | // relocations. They need to follow the other dynamic relocations so |
| 2446 | // that they can refer to global variables initialized by those |
| 2447 | // relocs. |
| 2448 | |
| 2449 | template<int size, bool big_endian> |
| 2450 | typename Target_aarch64<size, big_endian>::Reloc_section* |
| 2451 | Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout) |
| 2452 | { |
| 2453 | if (this->rela_irelative_ == NULL) |
| 2454 | { |
| 2455 | // Make sure we have already created the dynamic reloc section. |
| 2456 | this->rela_dyn_section(layout); |
| 2457 | this->rela_irelative_ = new Reloc_section(false); |
| 2458 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 2459 | elfcpp::SHF_ALLOC, this->rela_irelative_, |
| 2460 | ORDER_DYNAMIC_RELOCS, false); |
| 2461 | gold_assert(this->rela_dyn_->output_section() |
| 2462 | == this->rela_irelative_->output_section()); |
| 2463 | } |
| 2464 | return this->rela_irelative_; |
| 2465 | } |
| 2466 | |
| 2467 | |
| 2468 | // do_make_elf_object to override the same function in the base class. We need |
| 2469 | // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to |
| 2470 | // store backend specific information. Hence we need to have our own ELF object |
| 2471 | // creation. |
| 2472 | |
| 2473 | template<int size, bool big_endian> |
| 2474 | Object* |
| 2475 | Target_aarch64<size, big_endian>::do_make_elf_object( |
| 2476 | const std::string& name, |
| 2477 | Input_file* input_file, |
| 2478 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| 2479 | { |
| 2480 | int et = ehdr.get_e_type(); |
| 2481 | // ET_EXEC files are valid input for --just-symbols/-R, |
| 2482 | // and we treat them as relocatable objects. |
| 2483 | if (et == elfcpp::ET_EXEC && input_file->just_symbols()) |
| 2484 | return Sized_target<size, big_endian>::do_make_elf_object( |
| 2485 | name, input_file, offset, ehdr); |
| 2486 | else if (et == elfcpp::ET_REL) |
| 2487 | { |
| 2488 | AArch64_relobj<size, big_endian>* obj = |
| 2489 | new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| 2490 | obj->setup(); |
| 2491 | return obj; |
| 2492 | } |
| 2493 | else if (et == elfcpp::ET_DYN) |
| 2494 | { |
| 2495 | // Keep base implementation. |
| 2496 | Sized_dynobj<size, big_endian>* obj = |
| 2497 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); |
| 2498 | obj->setup(); |
| 2499 | return obj; |
| 2500 | } |
| 2501 | else |
| 2502 | { |
| 2503 | gold_error(_("%s: unsupported ELF file type %d"), |
| 2504 | name.c_str(), et); |
| 2505 | return NULL; |
| 2506 | } |
| 2507 | } |
| 2508 | |
| 2509 | |
| 2510 | // Scan a relocation for stub generation. |
| 2511 | |
| 2512 | template<int size, bool big_endian> |
| 2513 | void |
| 2514 | Target_aarch64<size, big_endian>::scan_reloc_for_stub( |
| 2515 | const Relocate_info<size, big_endian>* relinfo, |
| 2516 | unsigned int r_type, |
| 2517 | const Sized_symbol<size>* gsym, |
| 2518 | unsigned int r_sym, |
| 2519 | const Symbol_value<size>* psymval, |
| 2520 | typename elfcpp::Elf_types<size>::Elf_Swxword addend, |
| 2521 | Address address) |
| 2522 | { |
| 2523 | const AArch64_relobj<size, big_endian>* aarch64_relobj = |
| 2524 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); |
| 2525 | |
| 2526 | Symbol_value<size> symval; |
| 2527 | if (gsym != NULL) |
| 2528 | { |
| 2529 | const AArch64_reloc_property* arp = aarch64_reloc_property_table-> |
| 2530 | get_reloc_property(r_type); |
| 2531 | if (gsym->use_plt_offset(arp->reference_flags())) |
| 2532 | { |
| 2533 | // This uses a PLT, change the symbol value. |
| 2534 | symval.set_output_value(this->plt_section()->address() |
| 2535 | + gsym->plt_offset()); |
| 2536 | psymval = &symval; |
| 2537 | } |
| 2538 | else if (gsym->is_undefined()) |
| 2539 | // There is no need to generate a stub symbol is undefined. |
| 2540 | return; |
| 2541 | } |
| 2542 | |
| 2543 | // Get the symbol value. |
| 2544 | typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0); |
| 2545 | |
| 2546 | // Owing to pipelining, the PC relative branches below actually skip |
| 2547 | // two instructions when the branch offset is 0. |
| 2548 | Address destination = static_cast<Address>(-1); |
| 2549 | switch (r_type) |
| 2550 | { |
| 2551 | case elfcpp::R_AARCH64_CALL26: |
| 2552 | case elfcpp::R_AARCH64_JUMP26: |
| 2553 | destination = value + addend; |
| 2554 | break; |
| 2555 | default: |
| 2556 | gold_unreachable(); |
| 2557 | } |
| 2558 | |
| 2559 | typename The_reloc_stub::Stub_type stub_type = The_reloc_stub:: |
| 2560 | stub_type_for_reloc(r_type, address, destination); |
| 2561 | if (stub_type == The_reloc_stub::ST_NONE) |
| 2562 | return ; |
| 2563 | |
| 2564 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); |
| 2565 | gold_assert(stub_table != NULL); |
| 2566 | |
| 2567 | The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend); |
| 2568 | The_reloc_stub* stub = stub_table->find_reloc_stub(key); |
| 2569 | if (stub == NULL) |
| 2570 | { |
| 2571 | stub = new The_reloc_stub(stub_type); |
| 2572 | stub_table->add_reloc_stub(stub, key); |
| 2573 | } |
| 2574 | stub->set_destination_address(destination); |
| 2575 | } // End of Target_aarch64::scan_reloc_for_stub |
| 2576 | |
| 2577 | |
| 2578 | // This function scans a relocation section for stub generation. |
| 2579 | // The template parameter Relocate must be a class type which provides |
| 2580 | // a single function, relocate(), which implements the machine |
| 2581 | // specific part of a relocation. |
| 2582 | |
| 2583 | // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type: |
| 2584 | // SHT_REL or SHT_RELA. |
| 2585 | |
| 2586 | // PRELOCS points to the relocation data. RELOC_COUNT is the number |
| 2587 | // of relocs. OUTPUT_SECTION is the output section. |
| 2588 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be |
| 2589 | // mapped to output offsets. |
| 2590 | |
| 2591 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and |
| 2592 | // VIEW_SIZE is the size. These refer to the input section, unless |
| 2593 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to |
| 2594 | // the output section. |
| 2595 | |
| 2596 | template<int size, bool big_endian> |
| 2597 | template<int sh_type> |
| 2598 | void inline |
| 2599 | Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs( |
| 2600 | const Relocate_info<size, big_endian>* relinfo, |
| 2601 | const unsigned char* prelocs, |
| 2602 | size_t reloc_count, |
| 2603 | Output_section* /*output_section*/, |
| 2604 | bool /*needs_special_offset_handling*/, |
| 2605 | const unsigned char* /*view*/, |
| 2606 | Address view_address, |
| 2607 | section_size_type) |
| 2608 | { |
| 2609 | typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype; |
| 2610 | |
| 2611 | const int reloc_size = |
| 2612 | Reloc_types<sh_type,size,big_endian>::reloc_size; |
| 2613 | AArch64_relobj<size, big_endian>* object = |
| 2614 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); |
| 2615 | unsigned int local_count = object->local_symbol_count(); |
| 2616 | |
| 2617 | gold::Default_comdat_behavior default_comdat_behavior; |
| 2618 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; |
| 2619 | |
| 2620 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| 2621 | { |
| 2622 | Reltype reloc(prelocs); |
| 2623 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); |
| 2624 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 2625 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 2626 | if (r_type != elfcpp::R_AARCH64_CALL26 |
| 2627 | && r_type != elfcpp::R_AARCH64_JUMP26) |
| 2628 | continue; |
| 2629 | |
| 2630 | section_offset_type offset = |
| 2631 | convert_to_section_size_type(reloc.get_r_offset()); |
| 2632 | |
| 2633 | // Get the addend. |
| 2634 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = |
| 2635 | reloc.get_r_addend(); |
| 2636 | |
| 2637 | const Sized_symbol<size>* sym; |
| 2638 | Symbol_value<size> symval; |
| 2639 | const Symbol_value<size> *psymval; |
| 2640 | bool is_defined_in_discarded_section; |
| 2641 | unsigned int shndx; |
| 2642 | if (r_sym < local_count) |
| 2643 | { |
| 2644 | sym = NULL; |
| 2645 | psymval = object->local_symbol(r_sym); |
| 2646 | |
| 2647 | // If the local symbol belongs to a section we are discarding, |
| 2648 | // and that section is a debug section, try to find the |
| 2649 | // corresponding kept section and map this symbol to its |
| 2650 | // counterpart in the kept section. The symbol must not |
| 2651 | // correspond to a section we are folding. |
| 2652 | bool is_ordinary; |
| 2653 | shndx = psymval->input_shndx(&is_ordinary); |
| 2654 | is_defined_in_discarded_section = |
| 2655 | (is_ordinary |
| 2656 | && shndx != elfcpp::SHN_UNDEF |
| 2657 | && !object->is_section_included(shndx) |
| 2658 | && !relinfo->symtab->is_section_folded(object, shndx)); |
| 2659 | |
| 2660 | // We need to compute the would-be final value of this local |
| 2661 | // symbol. |
| 2662 | if (!is_defined_in_discarded_section) |
| 2663 | { |
| 2664 | typedef Sized_relobj_file<size, big_endian> ObjType; |
| 2665 | typename ObjType::Compute_final_local_value_status status = |
| 2666 | object->compute_final_local_value(r_sym, psymval, &symval, |
| 2667 | relinfo->symtab); |
| 2668 | if (status == ObjType::CFLV_OK) |
| 2669 | { |
| 2670 | // Currently we cannot handle a branch to a target in |
| 2671 | // a merged section. If this is the case, issue an error |
| 2672 | // and also free the merge symbol value. |
| 2673 | if (!symval.has_output_value()) |
| 2674 | { |
| 2675 | const std::string& section_name = |
| 2676 | object->section_name(shndx); |
| 2677 | object->error(_("cannot handle branch to local %u " |
| 2678 | "in a merged section %s"), |
| 2679 | r_sym, section_name.c_str()); |
| 2680 | } |
| 2681 | psymval = &symval; |
| 2682 | } |
| 2683 | else |
| 2684 | { |
| 2685 | // We cannot determine the final value. |
| 2686 | continue; |
| 2687 | } |
| 2688 | } |
| 2689 | } |
| 2690 | else |
| 2691 | { |
| 2692 | const Symbol* gsym; |
| 2693 | gsym = object->global_symbol(r_sym); |
| 2694 | gold_assert(gsym != NULL); |
| 2695 | if (gsym->is_forwarder()) |
| 2696 | gsym = relinfo->symtab->resolve_forwards(gsym); |
| 2697 | |
| 2698 | sym = static_cast<const Sized_symbol<size>*>(gsym); |
| 2699 | if (sym->has_symtab_index() && sym->symtab_index() != -1U) |
| 2700 | symval.set_output_symtab_index(sym->symtab_index()); |
| 2701 | else |
| 2702 | symval.set_no_output_symtab_entry(); |
| 2703 | |
| 2704 | // We need to compute the would-be final value of this global |
| 2705 | // symbol. |
| 2706 | const Symbol_table* symtab = relinfo->symtab; |
| 2707 | const Sized_symbol<size>* sized_symbol = |
| 2708 | symtab->get_sized_symbol<size>(gsym); |
| 2709 | Symbol_table::Compute_final_value_status status; |
| 2710 | typename elfcpp::Elf_types<size>::Elf_Addr value = |
| 2711 | symtab->compute_final_value<size>(sized_symbol, &status); |
| 2712 | |
| 2713 | // Skip this if the symbol has not output section. |
| 2714 | if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION) |
| 2715 | continue; |
| 2716 | symval.set_output_value(value); |
| 2717 | |
| 2718 | if (gsym->type() == elfcpp::STT_TLS) |
| 2719 | symval.set_is_tls_symbol(); |
| 2720 | else if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| 2721 | symval.set_is_ifunc_symbol(); |
| 2722 | psymval = &symval; |
| 2723 | |
| 2724 | is_defined_in_discarded_section = |
| 2725 | (gsym->is_defined_in_discarded_section() |
| 2726 | && gsym->is_undefined()); |
| 2727 | shndx = 0; |
| 2728 | } |
| 2729 | |
| 2730 | Symbol_value<size> symval2; |
| 2731 | if (is_defined_in_discarded_section) |
| 2732 | { |
| 2733 | if (comdat_behavior == CB_UNDETERMINED) |
| 2734 | { |
| 2735 | std::string name = object->section_name(relinfo->data_shndx); |
| 2736 | comdat_behavior = default_comdat_behavior.get(name.c_str()); |
| 2737 | } |
| 2738 | if (comdat_behavior == CB_PRETEND) |
| 2739 | { |
| 2740 | bool found; |
| 2741 | typename elfcpp::Elf_types<size>::Elf_Addr value = |
| 2742 | object->map_to_kept_section(shndx, &found); |
| 2743 | if (found) |
| 2744 | symval2.set_output_value(value + psymval->input_value()); |
| 2745 | else |
| 2746 | symval2.set_output_value(0); |
| 2747 | } |
| 2748 | else |
| 2749 | { |
| 2750 | if (comdat_behavior == CB_WARNING) |
| 2751 | gold_warning_at_location(relinfo, i, offset, |
| 2752 | _("relocation refers to discarded " |
| 2753 | "section")); |
| 2754 | symval2.set_output_value(0); |
| 2755 | } |
| 2756 | symval2.set_no_output_symtab_entry(); |
| 2757 | psymval = &symval2; |
| 2758 | } |
| 2759 | |
| 2760 | // If symbol is a section symbol, we don't know the actual type of |
| 2761 | // destination. Give up. |
| 2762 | if (psymval->is_section_symbol()) |
| 2763 | continue; |
| 2764 | |
| 2765 | this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval, |
| 2766 | addend, view_address + offset); |
| 2767 | } // End of iterating relocs in a section |
| 2768 | } // End of Target_aarch64::scan_reloc_section_for_stubs |
| 2769 | |
| 2770 | |
| 2771 | // Scan an input section for stub generation. |
| 2772 | |
| 2773 | template<int size, bool big_endian> |
| 2774 | void |
| 2775 | Target_aarch64<size, big_endian>::scan_section_for_stubs( |
| 2776 | const Relocate_info<size, big_endian>* relinfo, |
| 2777 | unsigned int sh_type, |
| 2778 | const unsigned char* prelocs, |
| 2779 | size_t reloc_count, |
| 2780 | Output_section* output_section, |
| 2781 | bool needs_special_offset_handling, |
| 2782 | const unsigned char* view, |
| 2783 | Address view_address, |
| 2784 | section_size_type view_size) |
| 2785 | { |
| 2786 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 2787 | this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>( |
| 2788 | relinfo, |
| 2789 | prelocs, |
| 2790 | reloc_count, |
| 2791 | output_section, |
| 2792 | needs_special_offset_handling, |
| 2793 | view, |
| 2794 | view_address, |
| 2795 | view_size); |
| 2796 | } |
| 2797 | |
| 2798 | |
| 2799 | // Relocate a single stub. |
| 2800 | |
| 2801 | template<int size, bool big_endian> |
| 2802 | void Target_aarch64<size, big_endian>:: |
| 2803 | relocate_stub(The_reloc_stub* stub, |
| 2804 | const The_relocate_info*, |
| 2805 | Output_section*, |
| 2806 | unsigned char* view, |
| 2807 | Address address, |
| 2808 | section_size_type) |
| 2809 | { |
| 2810 | typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions; |
| 2811 | typedef typename The_reloc_functions::Status The_reloc_functions_status; |
| 2812 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; |
| 2813 | |
| 2814 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 2815 | int insn_number = stub->stub_insn_number(); |
| 2816 | const uint32_t* insns = stub->stub_insns(); |
| 2817 | // Check the insns are really those stub insns. |
| 2818 | for (int i = 0; i < insn_number; ++i) |
| 2819 | { |
| 2820 | Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i); |
| 2821 | gold_assert(((uint32_t)insn == insns[i+1])); |
| 2822 | } |
| 2823 | |
| 2824 | Address dest = stub->destination_address(); |
| 2825 | |
| 2826 | switch(stub->stub_type()) |
| 2827 | { |
| 2828 | case The_reloc_stub::ST_ADRP_BRANCH: |
| 2829 | { |
| 2830 | // 1st reloc is ADR_PREL_PG_HI21 |
| 2831 | The_reloc_functions_status status = |
| 2832 | The_reloc_functions::adrp(view, dest, address); |
| 2833 | // An error should never arise in the above step. If so, please |
| 2834 | // check 'aarch64_valid_for_adrp_p'. |
| 2835 | gold_assert(status == The_reloc_functions::STATUS_OKAY); |
| 2836 | |
| 2837 | // 2nd reloc is ADD_ABS_LO12_NC |
| 2838 | const AArch64_reloc_property* arp = |
| 2839 | aarch64_reloc_property_table->get_reloc_property( |
| 2840 | elfcpp::R_AARCH64_ADD_ABS_LO12_NC); |
| 2841 | gold_assert(arp != NULL); |
| 2842 | status = The_reloc_functions::template |
| 2843 | rela_general<32>(view + 4, dest, 0, arp); |
| 2844 | // An error should never arise, it is an "_NC" relocation. |
| 2845 | gold_assert(status == The_reloc_functions::STATUS_OKAY); |
| 2846 | } |
| 2847 | break; |
| 2848 | |
| 2849 | case The_reloc_stub::ST_LONG_BRANCH_ABS: |
| 2850 | // 1st reloc is R_AARCH64_PREL64, at offset 8 |
| 2851 | elfcpp::Swap<64,big_endian>::writeval(view + 8, dest); |
| 2852 | break; |
| 2853 | |
| 2854 | case The_reloc_stub::ST_LONG_BRANCH_PCREL: |
| 2855 | { |
| 2856 | // "PC" calculation is the 2nd insn in the stub. |
| 2857 | uint64_t offset = dest - (address + 4); |
| 2858 | // Offset is placed at offset 4 and 5. |
| 2859 | elfcpp::Swap<64,big_endian>::writeval(view + 16, offset); |
| 2860 | } |
| 2861 | break; |
| 2862 | |
| 2863 | default: |
| 2864 | gold_unreachable(); |
| 2865 | } |
| 2866 | } |
| 2867 | |
| 2868 | |
| 2869 | // A class to handle the PLT data. |
| 2870 | // This is an abstract base class that handles most of the linker details |
| 2871 | // but does not know the actual contents of PLT entries. The derived |
| 2872 | // classes below fill in those details. |
| 2873 | |
| 2874 | template<int size, bool big_endian> |
| 2875 | class Output_data_plt_aarch64 : public Output_section_data |
| 2876 | { |
| 2877 | public: |
| 2878 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 2879 | Reloc_section; |
| 2880 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 2881 | |
| 2882 | Output_data_plt_aarch64(Layout* layout, |
| 2883 | uint64_t addralign, |
| 2884 | Output_data_got_aarch64<size, big_endian>* got, |
| 2885 | Output_data_space* got_plt, |
| 2886 | Output_data_space* got_irelative) |
| 2887 | : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL), |
| 2888 | got_(got), got_plt_(got_plt), got_irelative_(got_irelative), |
| 2889 | count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U) |
| 2890 | { this->init(layout); } |
| 2891 | |
| 2892 | // Initialize the PLT section. |
| 2893 | void |
| 2894 | init(Layout* layout); |
| 2895 | |
| 2896 | // Add an entry to the PLT. |
| 2897 | void |
| 2898 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
| 2899 | |
| 2900 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. |
| 2901 | unsigned int |
| 2902 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, |
| 2903 | Sized_relobj_file<size, big_endian>* relobj, |
| 2904 | unsigned int local_sym_index); |
| 2905 | |
| 2906 | // Add the relocation for a PLT entry. |
| 2907 | void |
| 2908 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, |
| 2909 | unsigned int got_offset); |
| 2910 | |
| 2911 | // Add the reserved TLSDESC_PLT entry to the PLT. |
| 2912 | void |
| 2913 | reserve_tlsdesc_entry(unsigned int got_offset) |
| 2914 | { this->tlsdesc_got_offset_ = got_offset; } |
| 2915 | |
| 2916 | // Return true if a TLSDESC_PLT entry has been reserved. |
| 2917 | bool |
| 2918 | has_tlsdesc_entry() const |
| 2919 | { return this->tlsdesc_got_offset_ != -1U; } |
| 2920 | |
| 2921 | // Return the GOT offset for the reserved TLSDESC_PLT entry. |
| 2922 | unsigned int |
| 2923 | get_tlsdesc_got_offset() const |
| 2924 | { return this->tlsdesc_got_offset_; } |
| 2925 | |
| 2926 | // Return the PLT offset of the reserved TLSDESC_PLT entry. |
| 2927 | unsigned int |
| 2928 | get_tlsdesc_plt_offset() const |
| 2929 | { |
| 2930 | return (this->first_plt_entry_offset() + |
| 2931 | (this->count_ + this->irelative_count_) |
| 2932 | * this->get_plt_entry_size()); |
| 2933 | } |
| 2934 | |
| 2935 | // Return the .rela.plt section data. |
| 2936 | Reloc_section* |
| 2937 | rela_plt() |
| 2938 | { return this->rel_; } |
| 2939 | |
| 2940 | // Return where the TLSDESC relocations should go. |
| 2941 | Reloc_section* |
| 2942 | rela_tlsdesc(Layout*); |
| 2943 | |
| 2944 | // Return where the IRELATIVE relocations should go in the PLT |
| 2945 | // relocations. |
| 2946 | Reloc_section* |
| 2947 | rela_irelative(Symbol_table*, Layout*); |
| 2948 | |
| 2949 | // Return whether we created a section for IRELATIVE relocations. |
| 2950 | bool |
| 2951 | has_irelative_section() const |
| 2952 | { return this->irelative_rel_ != NULL; } |
| 2953 | |
| 2954 | // Return the number of PLT entries. |
| 2955 | unsigned int |
| 2956 | entry_count() const |
| 2957 | { return this->count_ + this->irelative_count_; } |
| 2958 | |
| 2959 | // Return the offset of the first non-reserved PLT entry. |
| 2960 | unsigned int |
| 2961 | first_plt_entry_offset() const |
| 2962 | { return this->do_first_plt_entry_offset(); } |
| 2963 | |
| 2964 | // Return the size of a PLT entry. |
| 2965 | unsigned int |
| 2966 | get_plt_entry_size() const |
| 2967 | { return this->do_get_plt_entry_size(); } |
| 2968 | |
| 2969 | // Return the reserved tlsdesc entry size. |
| 2970 | unsigned int |
| 2971 | get_plt_tlsdesc_entry_size() const |
| 2972 | { return this->do_get_plt_tlsdesc_entry_size(); } |
| 2973 | |
| 2974 | // Return the PLT address to use for a global symbol. |
| 2975 | uint64_t |
| 2976 | address_for_global(const Symbol*); |
| 2977 | |
| 2978 | // Return the PLT address to use for a local symbol. |
| 2979 | uint64_t |
| 2980 | address_for_local(const Relobj*, unsigned int symndx); |
| 2981 | |
| 2982 | protected: |
| 2983 | // Fill in the first PLT entry. |
| 2984 | void |
| 2985 | fill_first_plt_entry(unsigned char* pov, |
| 2986 | Address got_address, |
| 2987 | Address plt_address) |
| 2988 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } |
| 2989 | |
| 2990 | // Fill in a normal PLT entry. |
| 2991 | void |
| 2992 | fill_plt_entry(unsigned char* pov, |
| 2993 | Address got_address, |
| 2994 | Address plt_address, |
| 2995 | unsigned int got_offset, |
| 2996 | unsigned int plt_offset) |
| 2997 | { |
| 2998 | this->do_fill_plt_entry(pov, got_address, plt_address, |
| 2999 | got_offset, plt_offset); |
| 3000 | } |
| 3001 | |
| 3002 | // Fill in the reserved TLSDESC PLT entry. |
| 3003 | void |
| 3004 | fill_tlsdesc_entry(unsigned char* pov, |
| 3005 | Address gotplt_address, |
| 3006 | Address plt_address, |
| 3007 | Address got_base, |
| 3008 | unsigned int tlsdesc_got_offset, |
| 3009 | unsigned int plt_offset) |
| 3010 | { |
| 3011 | this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, |
| 3012 | tlsdesc_got_offset, plt_offset); |
| 3013 | } |
| 3014 | |
| 3015 | virtual unsigned int |
| 3016 | do_first_plt_entry_offset() const = 0; |
| 3017 | |
| 3018 | virtual unsigned int |
| 3019 | do_get_plt_entry_size() const = 0; |
| 3020 | |
| 3021 | virtual unsigned int |
| 3022 | do_get_plt_tlsdesc_entry_size() const = 0; |
| 3023 | |
| 3024 | virtual void |
| 3025 | do_fill_first_plt_entry(unsigned char* pov, |
| 3026 | Address got_addr, |
| 3027 | Address plt_addr) = 0; |
| 3028 | |
| 3029 | virtual void |
| 3030 | do_fill_plt_entry(unsigned char* pov, |
| 3031 | Address got_address, |
| 3032 | Address plt_address, |
| 3033 | unsigned int got_offset, |
| 3034 | unsigned int plt_offset) = 0; |
| 3035 | |
| 3036 | virtual void |
| 3037 | do_fill_tlsdesc_entry(unsigned char* pov, |
| 3038 | Address gotplt_address, |
| 3039 | Address plt_address, |
| 3040 | Address got_base, |
| 3041 | unsigned int tlsdesc_got_offset, |
| 3042 | unsigned int plt_offset) = 0; |
| 3043 | |
| 3044 | void |
| 3045 | do_adjust_output_section(Output_section* os); |
| 3046 | |
| 3047 | // Write to a map file. |
| 3048 | void |
| 3049 | do_print_to_mapfile(Mapfile* mapfile) const |
| 3050 | { mapfile->print_output_data(this, _("** PLT")); } |
| 3051 | |
| 3052 | private: |
| 3053 | // Set the final size. |
| 3054 | void |
| 3055 | set_final_data_size(); |
| 3056 | |
| 3057 | // Write out the PLT data. |
| 3058 | void |
| 3059 | do_write(Output_file*); |
| 3060 | |
| 3061 | // The reloc section. |
| 3062 | Reloc_section* rel_; |
| 3063 | |
| 3064 | // The TLSDESC relocs, if necessary. These must follow the regular |
| 3065 | // PLT relocs. |
| 3066 | Reloc_section* tlsdesc_rel_; |
| 3067 | |
| 3068 | // The IRELATIVE relocs, if necessary. These must follow the |
| 3069 | // regular PLT relocations. |
| 3070 | Reloc_section* irelative_rel_; |
| 3071 | |
| 3072 | // The .got section. |
| 3073 | Output_data_got_aarch64<size, big_endian>* got_; |
| 3074 | |
| 3075 | // The .got.plt section. |
| 3076 | Output_data_space* got_plt_; |
| 3077 | |
| 3078 | // The part of the .got.plt section used for IRELATIVE relocs. |
| 3079 | Output_data_space* got_irelative_; |
| 3080 | |
| 3081 | // The number of PLT entries. |
| 3082 | unsigned int count_; |
| 3083 | |
| 3084 | // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These |
| 3085 | // follow the regular PLT entries. |
| 3086 | unsigned int irelative_count_; |
| 3087 | |
| 3088 | // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline. |
| 3089 | // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1 |
| 3090 | // indicates an offset is not allocated. |
| 3091 | unsigned int tlsdesc_got_offset_; |
| 3092 | }; |
| 3093 | |
| 3094 | // Initialize the PLT section. |
| 3095 | |
| 3096 | template<int size, bool big_endian> |
| 3097 | void |
| 3098 | Output_data_plt_aarch64<size, big_endian>::init(Layout* layout) |
| 3099 | { |
| 3100 | this->rel_ = new Reloc_section(false); |
| 3101 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 3102 | elfcpp::SHF_ALLOC, this->rel_, |
| 3103 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 3104 | } |
| 3105 | |
| 3106 | template<int size, bool big_endian> |
| 3107 | void |
| 3108 | Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section( |
| 3109 | Output_section* os) |
| 3110 | { |
| 3111 | os->set_entsize(this->get_plt_entry_size()); |
| 3112 | } |
| 3113 | |
| 3114 | // Add an entry to the PLT. |
| 3115 | |
| 3116 | template<int size, bool big_endian> |
| 3117 | void |
| 3118 | Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab, |
| 3119 | Layout* layout, Symbol* gsym) |
| 3120 | { |
| 3121 | gold_assert(!gsym->has_plt_offset()); |
| 3122 | |
| 3123 | unsigned int* pcount; |
| 3124 | unsigned int plt_reserved; |
| 3125 | Output_section_data_build* got; |
| 3126 | |
| 3127 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 3128 | && gsym->can_use_relative_reloc(false)) |
| 3129 | { |
| 3130 | pcount = &this->irelative_count_; |
| 3131 | plt_reserved = 0; |
| 3132 | got = this->got_irelative_; |
| 3133 | } |
| 3134 | else |
| 3135 | { |
| 3136 | pcount = &this->count_; |
| 3137 | plt_reserved = this->first_plt_entry_offset(); |
| 3138 | got = this->got_plt_; |
| 3139 | } |
| 3140 | |
| 3141 | gsym->set_plt_offset((*pcount) * this->get_plt_entry_size() |
| 3142 | + plt_reserved); |
| 3143 | |
| 3144 | ++*pcount; |
| 3145 | |
| 3146 | section_offset_type got_offset = got->current_data_size(); |
| 3147 | |
| 3148 | // Every PLT entry needs a GOT entry which points back to the PLT |
| 3149 | // entry (this will be changed by the dynamic linker, normally |
| 3150 | // lazily when the function is called). |
| 3151 | got->set_current_data_size(got_offset + size / 8); |
| 3152 | |
| 3153 | // Every PLT entry needs a reloc. |
| 3154 | this->add_relocation(symtab, layout, gsym, got_offset); |
| 3155 | |
| 3156 | // Note that we don't need to save the symbol. The contents of the |
| 3157 | // PLT are independent of which symbols are used. The symbols only |
| 3158 | // appear in the relocations. |
| 3159 | } |
| 3160 | |
| 3161 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
| 3162 | // the PLT offset. |
| 3163 | |
| 3164 | template<int size, bool big_endian> |
| 3165 | unsigned int |
| 3166 | Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry( |
| 3167 | Symbol_table* symtab, |
| 3168 | Layout* layout, |
| 3169 | Sized_relobj_file<size, big_endian>* relobj, |
| 3170 | unsigned int local_sym_index) |
| 3171 | { |
| 3172 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
| 3173 | ++this->irelative_count_; |
| 3174 | |
| 3175 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
| 3176 | |
| 3177 | // Every PLT entry needs a GOT entry which points back to the PLT |
| 3178 | // entry. |
| 3179 | this->got_irelative_->set_current_data_size(got_offset + size / 8); |
| 3180 | |
| 3181 | // Every PLT entry needs a reloc. |
| 3182 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
| 3183 | rela->add_symbolless_local_addend(relobj, local_sym_index, |
| 3184 | elfcpp::R_AARCH64_IRELATIVE, |
| 3185 | this->got_irelative_, got_offset, 0); |
| 3186 | |
| 3187 | return plt_offset; |
| 3188 | } |
| 3189 | |
| 3190 | // Add the relocation for a PLT entry. |
| 3191 | |
| 3192 | template<int size, bool big_endian> |
| 3193 | void |
| 3194 | Output_data_plt_aarch64<size, big_endian>::add_relocation( |
| 3195 | Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset) |
| 3196 | { |
| 3197 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 3198 | && gsym->can_use_relative_reloc(false)) |
| 3199 | { |
| 3200 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
| 3201 | rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE, |
| 3202 | this->got_irelative_, got_offset, 0); |
| 3203 | } |
| 3204 | else |
| 3205 | { |
| 3206 | gsym->set_needs_dynsym_entry(); |
| 3207 | this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_, |
| 3208 | got_offset, 0); |
| 3209 | } |
| 3210 | } |
| 3211 | |
| 3212 | // Return where the TLSDESC relocations should go, creating it if |
| 3213 | // necessary. These follow the JUMP_SLOT relocations. |
| 3214 | |
| 3215 | template<int size, bool big_endian> |
| 3216 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* |
| 3217 | Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout) |
| 3218 | { |
| 3219 | if (this->tlsdesc_rel_ == NULL) |
| 3220 | { |
| 3221 | this->tlsdesc_rel_ = new Reloc_section(false); |
| 3222 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 3223 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, |
| 3224 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 3225 | gold_assert(this->tlsdesc_rel_->output_section() |
| 3226 | == this->rel_->output_section()); |
| 3227 | } |
| 3228 | return this->tlsdesc_rel_; |
| 3229 | } |
| 3230 | |
| 3231 | // Return where the IRELATIVE relocations should go in the PLT. These |
| 3232 | // follow the JUMP_SLOT and the TLSDESC relocations. |
| 3233 | |
| 3234 | template<int size, bool big_endian> |
| 3235 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* |
| 3236 | Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab, |
| 3237 | Layout* layout) |
| 3238 | { |
| 3239 | if (this->irelative_rel_ == NULL) |
| 3240 | { |
| 3241 | // Make sure we have a place for the TLSDESC relocations, in |
| 3242 | // case we see any later on. |
| 3243 | this->rela_tlsdesc(layout); |
| 3244 | this->irelative_rel_ = new Reloc_section(false); |
| 3245 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 3246 | elfcpp::SHF_ALLOC, this->irelative_rel_, |
| 3247 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 3248 | gold_assert(this->irelative_rel_->output_section() |
| 3249 | == this->rel_->output_section()); |
| 3250 | |
| 3251 | if (parameters->doing_static_link()) |
| 3252 | { |
| 3253 | // A statically linked executable will only have a .rela.plt |
| 3254 | // section to hold R_AARCH64_IRELATIVE relocs for |
| 3255 | // STT_GNU_IFUNC symbols. The library will use these |
| 3256 | // symbols to locate the IRELATIVE relocs at program startup |
| 3257 | // time. |
| 3258 | symtab->define_in_output_data("__rela_iplt_start", NULL, |
| 3259 | Symbol_table::PREDEFINED, |
| 3260 | this->irelative_rel_, 0, 0, |
| 3261 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 3262 | elfcpp::STV_HIDDEN, 0, false, true); |
| 3263 | symtab->define_in_output_data("__rela_iplt_end", NULL, |
| 3264 | Symbol_table::PREDEFINED, |
| 3265 | this->irelative_rel_, 0, 0, |
| 3266 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 3267 | elfcpp::STV_HIDDEN, 0, true, true); |
| 3268 | } |
| 3269 | } |
| 3270 | return this->irelative_rel_; |
| 3271 | } |
| 3272 | |
| 3273 | // Return the PLT address to use for a global symbol. |
| 3274 | |
| 3275 | template<int size, bool big_endian> |
| 3276 | uint64_t |
| 3277 | Output_data_plt_aarch64<size, big_endian>::address_for_global( |
| 3278 | const Symbol* gsym) |
| 3279 | { |
| 3280 | uint64_t offset = 0; |
| 3281 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 3282 | && gsym->can_use_relative_reloc(false)) |
| 3283 | offset = (this->first_plt_entry_offset() + |
| 3284 | this->count_ * this->get_plt_entry_size()); |
| 3285 | return this->address() + offset + gsym->plt_offset(); |
| 3286 | } |
| 3287 | |
| 3288 | // Return the PLT address to use for a local symbol. These are always |
| 3289 | // IRELATIVE relocs. |
| 3290 | |
| 3291 | template<int size, bool big_endian> |
| 3292 | uint64_t |
| 3293 | Output_data_plt_aarch64<size, big_endian>::address_for_local( |
| 3294 | const Relobj* object, |
| 3295 | unsigned int r_sym) |
| 3296 | { |
| 3297 | return (this->address() |
| 3298 | + this->first_plt_entry_offset() |
| 3299 | + this->count_ * this->get_plt_entry_size() |
| 3300 | + object->local_plt_offset(r_sym)); |
| 3301 | } |
| 3302 | |
| 3303 | // Set the final size. |
| 3304 | |
| 3305 | template<int size, bool big_endian> |
| 3306 | void |
| 3307 | Output_data_plt_aarch64<size, big_endian>::set_final_data_size() |
| 3308 | { |
| 3309 | unsigned int count = this->count_ + this->irelative_count_; |
| 3310 | unsigned int extra_size = 0; |
| 3311 | if (this->has_tlsdesc_entry()) |
| 3312 | extra_size += this->get_plt_tlsdesc_entry_size(); |
| 3313 | this->set_data_size(this->first_plt_entry_offset() |
| 3314 | + count * this->get_plt_entry_size() |
| 3315 | + extra_size); |
| 3316 | } |
| 3317 | |
| 3318 | template<int size, bool big_endian> |
| 3319 | class Output_data_plt_aarch64_standard : |
| 3320 | public Output_data_plt_aarch64<size, big_endian> |
| 3321 | { |
| 3322 | public: |
| 3323 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 3324 | Output_data_plt_aarch64_standard( |
| 3325 | Layout* layout, |
| 3326 | Output_data_got_aarch64<size, big_endian>* got, |
| 3327 | Output_data_space* got_plt, |
| 3328 | Output_data_space* got_irelative) |
| 3329 | : Output_data_plt_aarch64<size, big_endian>(layout, |
| 3330 | size == 32 ? 4 : 8, |
| 3331 | got, got_plt, |
| 3332 | got_irelative) |
| 3333 | { } |
| 3334 | |
| 3335 | protected: |
| 3336 | // Return the offset of the first non-reserved PLT entry. |
| 3337 | virtual unsigned int |
| 3338 | do_first_plt_entry_offset() const |
| 3339 | { return this->first_plt_entry_size; } |
| 3340 | |
| 3341 | // Return the size of a PLT entry |
| 3342 | virtual unsigned int |
| 3343 | do_get_plt_entry_size() const |
| 3344 | { return this->plt_entry_size; } |
| 3345 | |
| 3346 | // Return the size of a tlsdesc entry |
| 3347 | virtual unsigned int |
| 3348 | do_get_plt_tlsdesc_entry_size() const |
| 3349 | { return this->plt_tlsdesc_entry_size; } |
| 3350 | |
| 3351 | virtual void |
| 3352 | do_fill_first_plt_entry(unsigned char* pov, |
| 3353 | Address got_address, |
| 3354 | Address plt_address); |
| 3355 | |
| 3356 | virtual void |
| 3357 | do_fill_plt_entry(unsigned char* pov, |
| 3358 | Address got_address, |
| 3359 | Address plt_address, |
| 3360 | unsigned int got_offset, |
| 3361 | unsigned int plt_offset); |
| 3362 | |
| 3363 | virtual void |
| 3364 | do_fill_tlsdesc_entry(unsigned char* pov, |
| 3365 | Address gotplt_address, |
| 3366 | Address plt_address, |
| 3367 | Address got_base, |
| 3368 | unsigned int tlsdesc_got_offset, |
| 3369 | unsigned int plt_offset); |
| 3370 | |
| 3371 | private: |
| 3372 | // The size of the first plt entry size. |
| 3373 | static const int first_plt_entry_size = 32; |
| 3374 | // The size of the plt entry size. |
| 3375 | static const int plt_entry_size = 16; |
| 3376 | // The size of the plt tlsdesc entry size. |
| 3377 | static const int plt_tlsdesc_entry_size = 32; |
| 3378 | // Template for the first PLT entry. |
| 3379 | static const uint32_t first_plt_entry[first_plt_entry_size / 4]; |
| 3380 | // Template for subsequent PLT entries. |
| 3381 | static const uint32_t plt_entry[plt_entry_size / 4]; |
| 3382 | // The reserved TLSDESC entry in the PLT for an executable. |
| 3383 | static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4]; |
| 3384 | }; |
| 3385 | |
| 3386 | // The first entry in the PLT for an executable. |
| 3387 | |
| 3388 | template<> |
| 3389 | const uint32_t |
| 3390 | Output_data_plt_aarch64_standard<32, false>:: |
| 3391 | first_plt_entry[first_plt_entry_size / 4] = |
| 3392 | { |
| 3393 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 3394 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ |
| 3395 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ |
| 3396 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ |
| 3397 | 0xd61f0220, /* br x17 */ |
| 3398 | 0xd503201f, /* nop */ |
| 3399 | 0xd503201f, /* nop */ |
| 3400 | 0xd503201f, /* nop */ |
| 3401 | }; |
| 3402 | |
| 3403 | |
| 3404 | template<> |
| 3405 | const uint32_t |
| 3406 | Output_data_plt_aarch64_standard<32, true>:: |
| 3407 | first_plt_entry[first_plt_entry_size / 4] = |
| 3408 | { |
| 3409 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 3410 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ |
| 3411 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ |
| 3412 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ |
| 3413 | 0xd61f0220, /* br x17 */ |
| 3414 | 0xd503201f, /* nop */ |
| 3415 | 0xd503201f, /* nop */ |
| 3416 | 0xd503201f, /* nop */ |
| 3417 | }; |
| 3418 | |
| 3419 | |
| 3420 | template<> |
| 3421 | const uint32_t |
| 3422 | Output_data_plt_aarch64_standard<64, false>:: |
| 3423 | first_plt_entry[first_plt_entry_size / 4] = |
| 3424 | { |
| 3425 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 3426 | 0x90000010, /* adrp x16, PLT_GOT+16 */ |
| 3427 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ |
| 3428 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ |
| 3429 | 0xd61f0220, /* br x17 */ |
| 3430 | 0xd503201f, /* nop */ |
| 3431 | 0xd503201f, /* nop */ |
| 3432 | 0xd503201f, /* nop */ |
| 3433 | }; |
| 3434 | |
| 3435 | |
| 3436 | template<> |
| 3437 | const uint32_t |
| 3438 | Output_data_plt_aarch64_standard<64, true>:: |
| 3439 | first_plt_entry[first_plt_entry_size / 4] = |
| 3440 | { |
| 3441 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 3442 | 0x90000010, /* adrp x16, PLT_GOT+16 */ |
| 3443 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ |
| 3444 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ |
| 3445 | 0xd61f0220, /* br x17 */ |
| 3446 | 0xd503201f, /* nop */ |
| 3447 | 0xd503201f, /* nop */ |
| 3448 | 0xd503201f, /* nop */ |
| 3449 | }; |
| 3450 | |
| 3451 | |
| 3452 | template<> |
| 3453 | const uint32_t |
| 3454 | Output_data_plt_aarch64_standard<32, false>:: |
| 3455 | plt_entry[plt_entry_size / 4] = |
| 3456 | { |
| 3457 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ |
| 3458 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ |
| 3459 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ |
| 3460 | 0xd61f0220, /* br x17. */ |
| 3461 | }; |
| 3462 | |
| 3463 | |
| 3464 | template<> |
| 3465 | const uint32_t |
| 3466 | Output_data_plt_aarch64_standard<32, true>:: |
| 3467 | plt_entry[plt_entry_size / 4] = |
| 3468 | { |
| 3469 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ |
| 3470 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ |
| 3471 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ |
| 3472 | 0xd61f0220, /* br x17. */ |
| 3473 | }; |
| 3474 | |
| 3475 | |
| 3476 | template<> |
| 3477 | const uint32_t |
| 3478 | Output_data_plt_aarch64_standard<64, false>:: |
| 3479 | plt_entry[plt_entry_size / 4] = |
| 3480 | { |
| 3481 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ |
| 3482 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ |
| 3483 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ |
| 3484 | 0xd61f0220, /* br x17. */ |
| 3485 | }; |
| 3486 | |
| 3487 | |
| 3488 | template<> |
| 3489 | const uint32_t |
| 3490 | Output_data_plt_aarch64_standard<64, true>:: |
| 3491 | plt_entry[plt_entry_size / 4] = |
| 3492 | { |
| 3493 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ |
| 3494 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ |
| 3495 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ |
| 3496 | 0xd61f0220, /* br x17. */ |
| 3497 | }; |
| 3498 | |
| 3499 | |
| 3500 | template<int size, bool big_endian> |
| 3501 | void |
| 3502 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry( |
| 3503 | unsigned char* pov, |
| 3504 | Address got_address, |
| 3505 | Address plt_address) |
| 3506 | { |
| 3507 | // PLT0 of the small PLT looks like this in ELF64 - |
| 3508 | // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack. |
| 3509 | // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT |
| 3510 | // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the |
| 3511 | // symbol resolver |
| 3512 | // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the |
| 3513 | // GOTPLT entry for this. |
| 3514 | // br x17 |
| 3515 | // PLT0 will be slightly different in ELF32 due to different got entry |
| 3516 | // size. |
| 3517 | memcpy(pov, this->first_plt_entry, this->first_plt_entry_size); |
| 3518 | Address gotplt_2nd_ent = got_address + (size / 8) * 2; |
| 3519 | |
| 3520 | // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2. |
| 3521 | // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff. |
| 3522 | // FIXME: This only works for 64bit |
| 3523 | AArch64_relocate_functions<size, big_endian>::adrp(pov + 4, |
| 3524 | gotplt_2nd_ent, plt_address + 4); |
| 3525 | |
| 3526 | // Fill in R_AARCH64_LDST8_LO12 |
| 3527 | elfcpp::Swap<32, big_endian>::writeval( |
| 3528 | pov + 8, |
| 3529 | ((this->first_plt_entry[2] & 0xffc003ff) |
| 3530 | | ((gotplt_2nd_ent & 0xff8) << 7))); |
| 3531 | |
| 3532 | // Fill in R_AARCH64_ADD_ABS_LO12 |
| 3533 | elfcpp::Swap<32, big_endian>::writeval( |
| 3534 | pov + 12, |
| 3535 | ((this->first_plt_entry[3] & 0xffc003ff) |
| 3536 | | ((gotplt_2nd_ent & 0xfff) << 10))); |
| 3537 | } |
| 3538 | |
| 3539 | |
| 3540 | // Subsequent entries in the PLT for an executable. |
| 3541 | // FIXME: This only works for 64bit |
| 3542 | |
| 3543 | template<int size, bool big_endian> |
| 3544 | void |
| 3545 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry( |
| 3546 | unsigned char* pov, |
| 3547 | Address got_address, |
| 3548 | Address plt_address, |
| 3549 | unsigned int got_offset, |
| 3550 | unsigned int plt_offset) |
| 3551 | { |
| 3552 | memcpy(pov, this->plt_entry, this->plt_entry_size); |
| 3553 | |
| 3554 | Address gotplt_entry_address = got_address + got_offset; |
| 3555 | Address plt_entry_address = plt_address + plt_offset; |
| 3556 | |
| 3557 | // Fill in R_AARCH64_PCREL_ADR_HI21 |
| 3558 | AArch64_relocate_functions<size, big_endian>::adrp( |
| 3559 | pov, |
| 3560 | gotplt_entry_address, |
| 3561 | plt_entry_address); |
| 3562 | |
| 3563 | // Fill in R_AARCH64_LDST64_ABS_LO12 |
| 3564 | elfcpp::Swap<32, big_endian>::writeval( |
| 3565 | pov + 4, |
| 3566 | ((this->plt_entry[1] & 0xffc003ff) |
| 3567 | | ((gotplt_entry_address & 0xff8) << 7))); |
| 3568 | |
| 3569 | // Fill in R_AARCH64_ADD_ABS_LO12 |
| 3570 | elfcpp::Swap<32, big_endian>::writeval( |
| 3571 | pov + 8, |
| 3572 | ((this->plt_entry[2] & 0xffc003ff) |
| 3573 | | ((gotplt_entry_address & 0xfff) <<10))); |
| 3574 | |
| 3575 | } |
| 3576 | |
| 3577 | |
| 3578 | template<> |
| 3579 | const uint32_t |
| 3580 | Output_data_plt_aarch64_standard<32, false>:: |
| 3581 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 3582 | { |
| 3583 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 3584 | 0x90000002, /* adrp x2, 0 */ |
| 3585 | 0x90000003, /* adrp x3, 0 */ |
| 3586 | 0xb9400042, /* ldr w2, [w2, #0] */ |
| 3587 | 0x11000063, /* add w3, w3, 0 */ |
| 3588 | 0xd61f0040, /* br x2 */ |
| 3589 | 0xd503201f, /* nop */ |
| 3590 | 0xd503201f, /* nop */ |
| 3591 | }; |
| 3592 | |
| 3593 | template<> |
| 3594 | const uint32_t |
| 3595 | Output_data_plt_aarch64_standard<32, true>:: |
| 3596 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 3597 | { |
| 3598 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 3599 | 0x90000002, /* adrp x2, 0 */ |
| 3600 | 0x90000003, /* adrp x3, 0 */ |
| 3601 | 0xb9400042, /* ldr w2, [w2, #0] */ |
| 3602 | 0x11000063, /* add w3, w3, 0 */ |
| 3603 | 0xd61f0040, /* br x2 */ |
| 3604 | 0xd503201f, /* nop */ |
| 3605 | 0xd503201f, /* nop */ |
| 3606 | }; |
| 3607 | |
| 3608 | template<> |
| 3609 | const uint32_t |
| 3610 | Output_data_plt_aarch64_standard<64, false>:: |
| 3611 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 3612 | { |
| 3613 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 3614 | 0x90000002, /* adrp x2, 0 */ |
| 3615 | 0x90000003, /* adrp x3, 0 */ |
| 3616 | 0xf9400042, /* ldr x2, [x2, #0] */ |
| 3617 | 0x91000063, /* add x3, x3, 0 */ |
| 3618 | 0xd61f0040, /* br x2 */ |
| 3619 | 0xd503201f, /* nop */ |
| 3620 | 0xd503201f, /* nop */ |
| 3621 | }; |
| 3622 | |
| 3623 | template<> |
| 3624 | const uint32_t |
| 3625 | Output_data_plt_aarch64_standard<64, true>:: |
| 3626 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 3627 | { |
| 3628 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 3629 | 0x90000002, /* adrp x2, 0 */ |
| 3630 | 0x90000003, /* adrp x3, 0 */ |
| 3631 | 0xf9400042, /* ldr x2, [x2, #0] */ |
| 3632 | 0x91000063, /* add x3, x3, 0 */ |
| 3633 | 0xd61f0040, /* br x2 */ |
| 3634 | 0xd503201f, /* nop */ |
| 3635 | 0xd503201f, /* nop */ |
| 3636 | }; |
| 3637 | |
| 3638 | template<int size, bool big_endian> |
| 3639 | void |
| 3640 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry( |
| 3641 | unsigned char* pov, |
| 3642 | Address gotplt_address, |
| 3643 | Address plt_address, |
| 3644 | Address got_base, |
| 3645 | unsigned int tlsdesc_got_offset, |
| 3646 | unsigned int plt_offset) |
| 3647 | { |
| 3648 | memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size); |
| 3649 | |
| 3650 | // move DT_TLSDESC_GOT address into x2 |
| 3651 | // move .got.plt address into x3 |
| 3652 | Address tlsdesc_got_entry = got_base + tlsdesc_got_offset; |
| 3653 | Address plt_entry_address = plt_address + plt_offset; |
| 3654 | |
| 3655 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 3656 | AArch64_relocate_functions<size, big_endian>::adrp( |
| 3657 | pov + 4, |
| 3658 | tlsdesc_got_entry, |
| 3659 | plt_entry_address + 4); |
| 3660 | |
| 3661 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 3662 | AArch64_relocate_functions<size, big_endian>::adrp( |
| 3663 | pov + 8, |
| 3664 | gotplt_address, |
| 3665 | plt_entry_address + 8); |
| 3666 | |
| 3667 | // R_AARCH64_LDST64_ABS_LO12 |
| 3668 | elfcpp::Swap<32, big_endian>::writeval( |
| 3669 | pov + 12, |
| 3670 | ((this->tlsdesc_plt_entry[3] & 0xffc003ff) |
| 3671 | | ((tlsdesc_got_entry & 0xff8) << 7))); |
| 3672 | |
| 3673 | // R_AARCH64_ADD_ABS_LO12 |
| 3674 | elfcpp::Swap<32, big_endian>::writeval( |
| 3675 | pov + 16, |
| 3676 | ((this->tlsdesc_plt_entry[4] & 0xffc003ff) |
| 3677 | | ((gotplt_address & 0xfff) << 10))); |
| 3678 | } |
| 3679 | |
| 3680 | // Write out the PLT. This uses the hand-coded instructions above, |
| 3681 | // and adjusts them as needed. This is specified by the AMD64 ABI. |
| 3682 | |
| 3683 | template<int size, bool big_endian> |
| 3684 | void |
| 3685 | Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of) |
| 3686 | { |
| 3687 | const off_t offset = this->offset(); |
| 3688 | const section_size_type oview_size = |
| 3689 | convert_to_section_size_type(this->data_size()); |
| 3690 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 3691 | |
| 3692 | const off_t got_file_offset = this->got_plt_->offset(); |
| 3693 | gold_assert(got_file_offset + this->got_plt_->data_size() |
| 3694 | == this->got_irelative_->offset()); |
| 3695 | |
| 3696 | const section_size_type got_size = |
| 3697 | convert_to_section_size_type(this->got_plt_->data_size() |
| 3698 | + this->got_irelative_->data_size()); |
| 3699 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
| 3700 | got_size); |
| 3701 | |
| 3702 | unsigned char* pov = oview; |
| 3703 | |
| 3704 | // The base address of the .plt section. |
| 3705 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
| 3706 | // The base address of the PLT portion of the .got section. |
| 3707 | typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address |
| 3708 | = this->got_plt_->address(); |
| 3709 | |
| 3710 | this->fill_first_plt_entry(pov, gotplt_address, plt_address); |
| 3711 | pov += this->first_plt_entry_offset(); |
| 3712 | |
| 3713 | // The first three entries in .got.plt are reserved. |
| 3714 | unsigned char* got_pov = got_view; |
| 3715 | memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT); |
| 3716 | got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; |
| 3717 | |
| 3718 | unsigned int plt_offset = this->first_plt_entry_offset(); |
| 3719 | unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; |
| 3720 | const unsigned int count = this->count_ + this->irelative_count_; |
| 3721 | for (unsigned int plt_index = 0; |
| 3722 | plt_index < count; |
| 3723 | ++plt_index, |
| 3724 | pov += this->get_plt_entry_size(), |
| 3725 | got_pov += size / 8, |
| 3726 | plt_offset += this->get_plt_entry_size(), |
| 3727 | got_offset += size / 8) |
| 3728 | { |
| 3729 | // Set and adjust the PLT entry itself. |
| 3730 | this->fill_plt_entry(pov, gotplt_address, plt_address, |
| 3731 | got_offset, plt_offset); |
| 3732 | |
| 3733 | // Set the entry in the GOT, which points to plt0. |
| 3734 | elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address); |
| 3735 | } |
| 3736 | |
| 3737 | if (this->has_tlsdesc_entry()) |
| 3738 | { |
| 3739 | // Set and adjust the reserved TLSDESC PLT entry. |
| 3740 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); |
| 3741 | // The base address of the .base section. |
| 3742 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = |
| 3743 | this->got_->address(); |
| 3744 | this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, |
| 3745 | tlsdesc_got_offset, plt_offset); |
| 3746 | pov += this->get_plt_tlsdesc_entry_size(); |
| 3747 | } |
| 3748 | |
| 3749 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
| 3750 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); |
| 3751 | |
| 3752 | of->write_output_view(offset, oview_size, oview); |
| 3753 | of->write_output_view(got_file_offset, got_size, got_view); |
| 3754 | } |
| 3755 | |
| 3756 | // Telling how to update the immediate field of an instruction. |
| 3757 | struct AArch64_howto |
| 3758 | { |
| 3759 | // The immediate field mask. |
| 3760 | elfcpp::Elf_Xword dst_mask; |
| 3761 | |
| 3762 | // The offset to apply relocation immediate |
| 3763 | int doffset; |
| 3764 | |
| 3765 | // The second part offset, if the immediate field has two parts. |
| 3766 | // -1 if the immediate field has only one part. |
| 3767 | int doffset2; |
| 3768 | }; |
| 3769 | |
| 3770 | static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] = |
| 3771 | { |
| 3772 | {0, -1, -1}, // DATA |
| 3773 | {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16 |
| 3774 | {0xffffe0, 5, -1}, // LD [23:5]-imm19 |
| 3775 | {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi |
| 3776 | {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi |
| 3777 | {0x3ffc00, 10, -1}, // ADD [21:10]-imm12 |
| 3778 | {0x3ffc00, 10, -1}, // LDST [21:10]-imm12 |
| 3779 | {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14 |
| 3780 | {0xffffe0, 5, -1}, // CONDB [23:5]-imm19 |
| 3781 | {0x3ffffff, 0, -1}, // B [25:0]-imm26 |
| 3782 | {0x3ffffff, 0, -1}, // CALL [25:0]-imm26 |
| 3783 | }; |
| 3784 | |
| 3785 | // AArch64 relocate function class |
| 3786 | |
| 3787 | template<int size, bool big_endian> |
| 3788 | class AArch64_relocate_functions |
| 3789 | { |
| 3790 | public: |
| 3791 | typedef enum |
| 3792 | { |
| 3793 | STATUS_OKAY, // No error during relocation. |
| 3794 | STATUS_OVERFLOW, // Relocation overflow. |
| 3795 | STATUS_BAD_RELOC, // Relocation cannot be applied. |
| 3796 | } Status; |
| 3797 | |
| 3798 | typedef AArch64_relocate_functions<size, big_endian> This; |
| 3799 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 3800 | typedef Relocate_info<size, big_endian> The_relocate_info; |
| 3801 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 3802 | typedef Reloc_stub<size, big_endian> The_reloc_stub; |
| 3803 | typedef typename The_reloc_stub::Stub_type The_reloc_stub_type; |
| 3804 | typedef Stub_table<size, big_endian> The_stub_table; |
| 3805 | typedef elfcpp::Rela<size, big_endian> The_rela; |
| 3806 | typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype; |
| 3807 | |
| 3808 | // Return the page address of the address. |
| 3809 | // Page(address) = address & ~0xFFF |
| 3810 | |
| 3811 | static inline AArch64_valtype |
| 3812 | Page(Address address) |
| 3813 | { |
| 3814 | return (address & (~static_cast<Address>(0xFFF))); |
| 3815 | } |
| 3816 | |
| 3817 | private: |
| 3818 | // Update instruction (pointed by view) with selected bits (immed). |
| 3819 | // val = (val & ~dst_mask) | (immed << doffset) |
| 3820 | |
| 3821 | template<int valsize> |
| 3822 | static inline void |
| 3823 | update_view(unsigned char* view, |
| 3824 | AArch64_valtype immed, |
| 3825 | elfcpp::Elf_Xword doffset, |
| 3826 | elfcpp::Elf_Xword dst_mask) |
| 3827 | { |
| 3828 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 3829 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 3830 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 3831 | |
| 3832 | // Clear immediate fields. |
| 3833 | val &= ~dst_mask; |
| 3834 | elfcpp::Swap<valsize, big_endian>::writeval(wv, |
| 3835 | static_cast<Valtype>(val | (immed << doffset))); |
| 3836 | } |
| 3837 | |
| 3838 | // Update two parts of an instruction (pointed by view) with selected |
| 3839 | // bits (immed1 and immed2). |
| 3840 | // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2) |
| 3841 | |
| 3842 | template<int valsize> |
| 3843 | static inline void |
| 3844 | update_view_two_parts( |
| 3845 | unsigned char* view, |
| 3846 | AArch64_valtype immed1, |
| 3847 | AArch64_valtype immed2, |
| 3848 | elfcpp::Elf_Xword doffset1, |
| 3849 | elfcpp::Elf_Xword doffset2, |
| 3850 | elfcpp::Elf_Xword dst_mask) |
| 3851 | { |
| 3852 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 3853 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 3854 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 3855 | val &= ~dst_mask; |
| 3856 | elfcpp::Swap<valsize, big_endian>::writeval(wv, |
| 3857 | static_cast<Valtype>(val | (immed1 << doffset1) | |
| 3858 | (immed2 << doffset2))); |
| 3859 | } |
| 3860 | |
| 3861 | // Update adr or adrp instruction with immed. |
| 3862 | // In adr and adrp: [30:29] immlo [23:5] immhi |
| 3863 | |
| 3864 | static inline void |
| 3865 | update_adr(unsigned char* view, AArch64_valtype immed) |
| 3866 | { |
| 3867 | elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5); |
| 3868 | This::template update_view_two_parts<32>( |
| 3869 | view, |
| 3870 | immed & 0x3, |
| 3871 | (immed & 0x1ffffc) >> 2, |
| 3872 | 29, |
| 3873 | 5, |
| 3874 | dst_mask); |
| 3875 | } |
| 3876 | |
| 3877 | // Update movz/movn instruction with bits immed. |
| 3878 | // Set instruction to movz if is_movz is true, otherwise set instruction |
| 3879 | // to movn. |
| 3880 | |
| 3881 | static inline void |
| 3882 | update_movnz(unsigned char* view, |
| 3883 | AArch64_valtype immed, |
| 3884 | bool is_movz) |
| 3885 | { |
| 3886 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| 3887 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 3888 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 3889 | |
| 3890 | const elfcpp::Elf_Xword doffset = |
| 3891 | aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset; |
| 3892 | const elfcpp::Elf_Xword dst_mask = |
| 3893 | aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask; |
| 3894 | |
| 3895 | // Clear immediate fields and opc code. |
| 3896 | val &= ~(dst_mask | (0x3 << 29)); |
| 3897 | |
| 3898 | // Set instruction to movz or movn. |
| 3899 | // movz: [30:29] is 10 movn: [30:29] is 00 |
| 3900 | if (is_movz) |
| 3901 | val |= (0x2 << 29); |
| 3902 | |
| 3903 | elfcpp::Swap<32, big_endian>::writeval(wv, |
| 3904 | static_cast<Valtype>(val | (immed << doffset))); |
| 3905 | } |
| 3906 | |
| 3907 | // Update selected bits in text. |
| 3908 | |
| 3909 | template<int valsize> |
| 3910 | static inline typename This::Status |
| 3911 | reloc_common(unsigned char* view, Address x, |
| 3912 | const AArch64_reloc_property* reloc_property) |
| 3913 | { |
| 3914 | // Select bits from X. |
| 3915 | Address immed = reloc_property->select_x_value(x); |
| 3916 | |
| 3917 | // Update view. |
| 3918 | const AArch64_reloc_property::Reloc_inst inst = |
| 3919 | reloc_property->reloc_inst(); |
| 3920 | // If it is a data relocation or instruction has 2 parts of immediate |
| 3921 | // fields, you should not call pcrela_general. |
| 3922 | gold_assert(aarch64_howto[inst].doffset2 == -1 && |
| 3923 | aarch64_howto[inst].doffset != -1); |
| 3924 | This::template update_view<valsize>(view, immed, |
| 3925 | aarch64_howto[inst].doffset, |
| 3926 | aarch64_howto[inst].dst_mask); |
| 3927 | |
| 3928 | // Do check overflow or alignment if needed. |
| 3929 | return (reloc_property->checkup_x_value(x) |
| 3930 | ? This::STATUS_OKAY |
| 3931 | : This::STATUS_OVERFLOW); |
| 3932 | } |
| 3933 | |
| 3934 | public: |
| 3935 | |
| 3936 | // Do a simple rela relocation at unaligned addresses. |
| 3937 | |
| 3938 | template<int valsize> |
| 3939 | static inline typename This::Status |
| 3940 | rela_ua(unsigned char* view, |
| 3941 | const Sized_relobj_file<size, big_endian>* object, |
| 3942 | const Symbol_value<size>* psymval, |
| 3943 | AArch64_valtype addend, |
| 3944 | const AArch64_reloc_property* reloc_property) |
| 3945 | { |
| 3946 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| 3947 | Valtype; |
| 3948 | typename elfcpp::Elf_types<size>::Elf_Addr x = |
| 3949 | psymval->value(object, addend); |
| 3950 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
| 3951 | static_cast<Valtype>(x)); |
| 3952 | return (reloc_property->checkup_x_value(x) |
| 3953 | ? This::STATUS_OKAY |
| 3954 | : This::STATUS_OVERFLOW); |
| 3955 | } |
| 3956 | |
| 3957 | // Do a simple pc-relative relocation at unaligned addresses. |
| 3958 | |
| 3959 | template<int valsize> |
| 3960 | static inline typename This::Status |
| 3961 | pcrela_ua(unsigned char* view, |
| 3962 | const Sized_relobj_file<size, big_endian>* object, |
| 3963 | const Symbol_value<size>* psymval, |
| 3964 | AArch64_valtype addend, |
| 3965 | Address address, |
| 3966 | const AArch64_reloc_property* reloc_property) |
| 3967 | { |
| 3968 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| 3969 | Valtype; |
| 3970 | Address x = psymval->value(object, addend) - address; |
| 3971 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
| 3972 | static_cast<Valtype>(x)); |
| 3973 | return (reloc_property->checkup_x_value(x) |
| 3974 | ? This::STATUS_OKAY |
| 3975 | : This::STATUS_OVERFLOW); |
| 3976 | } |
| 3977 | |
| 3978 | // Do a simple rela relocation at aligned addresses. |
| 3979 | |
| 3980 | template<int valsize> |
| 3981 | static inline typename This::Status |
| 3982 | rela( |
| 3983 | unsigned char* view, |
| 3984 | const Sized_relobj_file<size, big_endian>* object, |
| 3985 | const Symbol_value<size>* psymval, |
| 3986 | AArch64_valtype addend, |
| 3987 | const AArch64_reloc_property* reloc_property) |
| 3988 | { |
| 3989 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 3990 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 3991 | Address x = psymval->value(object, addend); |
| 3992 | elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x)); |
| 3993 | return (reloc_property->checkup_x_value(x) |
| 3994 | ? This::STATUS_OKAY |
| 3995 | : This::STATUS_OVERFLOW); |
| 3996 | } |
| 3997 | |
| 3998 | // Do relocate. Update selected bits in text. |
| 3999 | // new_val = (val & ~dst_mask) | (immed << doffset) |
| 4000 | |
| 4001 | template<int valsize> |
| 4002 | static inline typename This::Status |
| 4003 | rela_general(unsigned char* view, |
| 4004 | const Sized_relobj_file<size, big_endian>* object, |
| 4005 | const Symbol_value<size>* psymval, |
| 4006 | AArch64_valtype addend, |
| 4007 | const AArch64_reloc_property* reloc_property) |
| 4008 | { |
| 4009 | // Calculate relocation. |
| 4010 | Address x = psymval->value(object, addend); |
| 4011 | return This::template reloc_common<valsize>(view, x, reloc_property); |
| 4012 | } |
| 4013 | |
| 4014 | // Do relocate. Update selected bits in text. |
| 4015 | // new val = (val & ~dst_mask) | (immed << doffset) |
| 4016 | |
| 4017 | template<int valsize> |
| 4018 | static inline typename This::Status |
| 4019 | rela_general( |
| 4020 | unsigned char* view, |
| 4021 | AArch64_valtype s, |
| 4022 | AArch64_valtype addend, |
| 4023 | const AArch64_reloc_property* reloc_property) |
| 4024 | { |
| 4025 | // Calculate relocation. |
| 4026 | Address x = s + addend; |
| 4027 | return This::template reloc_common<valsize>(view, x, reloc_property); |
| 4028 | } |
| 4029 | |
| 4030 | // Do address relative relocate. Update selected bits in text. |
| 4031 | // new val = (val & ~dst_mask) | (immed << doffset) |
| 4032 | |
| 4033 | template<int valsize> |
| 4034 | static inline typename This::Status |
| 4035 | pcrela_general( |
| 4036 | unsigned char* view, |
| 4037 | const Sized_relobj_file<size, big_endian>* object, |
| 4038 | const Symbol_value<size>* psymval, |
| 4039 | AArch64_valtype addend, |
| 4040 | Address address, |
| 4041 | const AArch64_reloc_property* reloc_property) |
| 4042 | { |
| 4043 | // Calculate relocation. |
| 4044 | Address x = psymval->value(object, addend) - address; |
| 4045 | return This::template reloc_common<valsize>(view, x, reloc_property); |
| 4046 | } |
| 4047 | |
| 4048 | |
| 4049 | // Calculate (S + A) - address, update adr instruction. |
| 4050 | |
| 4051 | static inline typename This::Status |
| 4052 | adr(unsigned char* view, |
| 4053 | const Sized_relobj_file<size, big_endian>* object, |
| 4054 | const Symbol_value<size>* psymval, |
| 4055 | Address addend, |
| 4056 | Address address, |
| 4057 | const AArch64_reloc_property* /* reloc_property */) |
| 4058 | { |
| 4059 | AArch64_valtype x = psymval->value(object, addend) - address; |
| 4060 | // Pick bits [20:0] of X. |
| 4061 | AArch64_valtype immed = x & 0x1fffff; |
| 4062 | update_adr(view, immed); |
| 4063 | // Check -2^20 <= X < 2^20 |
| 4064 | return (size == 64 && Bits<21>::has_overflow((x)) |
| 4065 | ? This::STATUS_OVERFLOW |
| 4066 | : This::STATUS_OKAY); |
| 4067 | } |
| 4068 | |
| 4069 | // Calculate PG(S+A) - PG(address), update adrp instruction. |
| 4070 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 4071 | |
| 4072 | static inline typename This::Status |
| 4073 | adrp( |
| 4074 | unsigned char* view, |
| 4075 | Address sa, |
| 4076 | Address address) |
| 4077 | { |
| 4078 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
| 4079 | // Pick [32:12] of X. |
| 4080 | AArch64_valtype immed = (x >> 12) & 0x1fffff; |
| 4081 | update_adr(view, immed); |
| 4082 | // Check -2^32 <= X < 2^32 |
| 4083 | return (size == 64 && Bits<33>::has_overflow((x)) |
| 4084 | ? This::STATUS_OVERFLOW |
| 4085 | : This::STATUS_OKAY); |
| 4086 | } |
| 4087 | |
| 4088 | // Calculate PG(S+A) - PG(address), update adrp instruction. |
| 4089 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 4090 | |
| 4091 | static inline typename This::Status |
| 4092 | adrp(unsigned char* view, |
| 4093 | const Sized_relobj_file<size, big_endian>* object, |
| 4094 | const Symbol_value<size>* psymval, |
| 4095 | Address addend, |
| 4096 | Address address, |
| 4097 | const AArch64_reloc_property* reloc_property) |
| 4098 | { |
| 4099 | Address sa = psymval->value(object, addend); |
| 4100 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
| 4101 | // Pick [32:12] of X. |
| 4102 | AArch64_valtype immed = (x >> 12) & 0x1fffff; |
| 4103 | update_adr(view, immed); |
| 4104 | return (reloc_property->checkup_x_value(x) |
| 4105 | ? This::STATUS_OKAY |
| 4106 | : This::STATUS_OVERFLOW); |
| 4107 | } |
| 4108 | |
| 4109 | // Update mov[n/z] instruction. Check overflow if needed. |
| 4110 | // If X >=0, set the instruction to movz and its immediate value to the |
| 4111 | // selected bits S. |
| 4112 | // If X < 0, set the instruction to movn and its immediate value to |
| 4113 | // NOT (selected bits of). |
| 4114 | |
| 4115 | static inline typename This::Status |
| 4116 | movnz(unsigned char* view, |
| 4117 | AArch64_valtype x, |
| 4118 | const AArch64_reloc_property* reloc_property) |
| 4119 | { |
| 4120 | // Select bits from X. |
| 4121 | Address immed; |
| 4122 | bool is_movz; |
| 4123 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW; |
| 4124 | if (static_cast<SignedW>(x) >= 0) |
| 4125 | { |
| 4126 | immed = reloc_property->select_x_value(x); |
| 4127 | is_movz = true; |
| 4128 | } |
| 4129 | else |
| 4130 | { |
| 4131 | immed = reloc_property->select_x_value(~x);; |
| 4132 | is_movz = false; |
| 4133 | } |
| 4134 | |
| 4135 | // Update movnz instruction. |
| 4136 | update_movnz(view, immed, is_movz); |
| 4137 | |
| 4138 | // Do check overflow or alignment if needed. |
| 4139 | return (reloc_property->checkup_x_value(x) |
| 4140 | ? This::STATUS_OKAY |
| 4141 | : This::STATUS_OVERFLOW); |
| 4142 | } |
| 4143 | |
| 4144 | static inline bool |
| 4145 | maybe_apply_stub(unsigned int, |
| 4146 | const The_relocate_info*, |
| 4147 | const The_rela&, |
| 4148 | unsigned char*, |
| 4149 | Address, |
| 4150 | const Sized_symbol<size>*, |
| 4151 | const Symbol_value<size>*, |
| 4152 | const Sized_relobj_file<size, big_endian>*, |
| 4153 | section_size_type); |
| 4154 | |
| 4155 | }; // End of AArch64_relocate_functions |
| 4156 | |
| 4157 | |
| 4158 | // For a certain relocation type (usually jump/branch), test to see if the |
| 4159 | // destination needs a stub to fulfil. If so, re-route the destination of the |
| 4160 | // original instruction to the stub, note, at this time, the stub has already |
| 4161 | // been generated. |
| 4162 | |
| 4163 | template<int size, bool big_endian> |
| 4164 | bool |
| 4165 | AArch64_relocate_functions<size, big_endian>:: |
| 4166 | maybe_apply_stub(unsigned int r_type, |
| 4167 | const The_relocate_info* relinfo, |
| 4168 | const The_rela& rela, |
| 4169 | unsigned char* view, |
| 4170 | Address address, |
| 4171 | const Sized_symbol<size>* gsym, |
| 4172 | const Symbol_value<size>* psymval, |
| 4173 | const Sized_relobj_file<size, big_endian>* object, |
| 4174 | section_size_type current_group_size) |
| 4175 | { |
| 4176 | if (parameters->options().relocatable()) |
| 4177 | return false; |
| 4178 | |
| 4179 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend(); |
| 4180 | Address branch_target = psymval->value(object, 0) + addend; |
| 4181 | The_reloc_stub_type stub_type = The_reloc_stub:: |
| 4182 | stub_type_for_reloc(r_type, address, branch_target); |
| 4183 | if (stub_type == The_reloc_stub::ST_NONE) |
| 4184 | return false; |
| 4185 | |
| 4186 | const The_aarch64_relobj* aarch64_relobj = |
| 4187 | static_cast<const The_aarch64_relobj*>(object); |
| 4188 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); |
| 4189 | gold_assert(stub_table != NULL); |
| 4190 | |
| 4191 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 4192 | typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); |
| 4193 | The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key); |
| 4194 | gold_assert(stub != NULL); |
| 4195 | |
| 4196 | Address new_branch_target = stub_table->address() + stub->offset(); |
| 4197 | typename elfcpp::Swap<size, big_endian>::Valtype branch_offset = |
| 4198 | new_branch_target - address; |
| 4199 | const AArch64_reloc_property* arp = |
| 4200 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 4201 | gold_assert(arp != NULL); |
| 4202 | typename This::Status status = This::template |
| 4203 | rela_general<32>(view, branch_offset, 0, arp); |
| 4204 | if (status != This::STATUS_OKAY) |
| 4205 | gold_error(_("Stub is too far away, try a smaller value " |
| 4206 | "for '--stub-group-size'. The current value is 0x%lx."), |
| 4207 | static_cast<unsigned long>(current_group_size)); |
| 4208 | return true; |
| 4209 | } |
| 4210 | |
| 4211 | |
| 4212 | // Group input sections for stub generation. |
| 4213 | // |
| 4214 | // We group input sections in an output section so that the total size, |
| 4215 | // including any padding space due to alignment is smaller than GROUP_SIZE |
| 4216 | // unless the only input section in group is bigger than GROUP_SIZE already. |
| 4217 | // Then an ARM stub table is created to follow the last input section |
| 4218 | // in group. For each group an ARM stub table is created an is placed |
| 4219 | // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further |
| 4220 | // extend the group after the stub table. |
| 4221 | |
| 4222 | template<int size, bool big_endian> |
| 4223 | void |
| 4224 | Target_aarch64<size, big_endian>::group_sections( |
| 4225 | Layout* layout, |
| 4226 | section_size_type group_size, |
| 4227 | bool stubs_always_after_branch, |
| 4228 | const Task* task) |
| 4229 | { |
| 4230 | // Group input sections and insert stub table |
| 4231 | Layout::Section_list section_list; |
| 4232 | layout->get_executable_sections(§ion_list); |
| 4233 | for (Layout::Section_list::const_iterator p = section_list.begin(); |
| 4234 | p != section_list.end(); |
| 4235 | ++p) |
| 4236 | { |
| 4237 | AArch64_output_section<size, big_endian>* output_section = |
| 4238 | static_cast<AArch64_output_section<size, big_endian>*>(*p); |
| 4239 | output_section->group_sections(group_size, stubs_always_after_branch, |
| 4240 | this, task); |
| 4241 | } |
| 4242 | } |
| 4243 | |
| 4244 | |
| 4245 | // Find the AArch64_input_section object corresponding to the SHNDX-th input |
| 4246 | // section of RELOBJ. |
| 4247 | |
| 4248 | template<int size, bool big_endian> |
| 4249 | AArch64_input_section<size, big_endian>* |
| 4250 | Target_aarch64<size, big_endian>::find_aarch64_input_section( |
| 4251 | Relobj* relobj, unsigned int shndx) const |
| 4252 | { |
| 4253 | Section_id sid(relobj, shndx); |
| 4254 | typename AArch64_input_section_map::const_iterator p = |
| 4255 | this->aarch64_input_section_map_.find(sid); |
| 4256 | return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL; |
| 4257 | } |
| 4258 | |
| 4259 | |
| 4260 | // Make a new AArch64_input_section object. |
| 4261 | |
| 4262 | template<int size, bool big_endian> |
| 4263 | AArch64_input_section<size, big_endian>* |
| 4264 | Target_aarch64<size, big_endian>::new_aarch64_input_section( |
| 4265 | Relobj* relobj, unsigned int shndx) |
| 4266 | { |
| 4267 | Section_id sid(relobj, shndx); |
| 4268 | |
| 4269 | AArch64_input_section<size, big_endian>* input_section = |
| 4270 | new AArch64_input_section<size, big_endian>(relobj, shndx); |
| 4271 | input_section->init(); |
| 4272 | |
| 4273 | // Register new AArch64_input_section in map for look-up. |
| 4274 | std::pair<typename AArch64_input_section_map::iterator,bool> ins = |
| 4275 | this->aarch64_input_section_map_.insert( |
| 4276 | std::make_pair(sid, input_section)); |
| 4277 | |
| 4278 | // Make sure that it we have not created another AArch64_input_section |
| 4279 | // for this input section already. |
| 4280 | gold_assert(ins.second); |
| 4281 | |
| 4282 | return input_section; |
| 4283 | } |
| 4284 | |
| 4285 | |
| 4286 | // Relaxation hook. This is where we do stub generation. |
| 4287 | |
| 4288 | template<int size, bool big_endian> |
| 4289 | bool |
| 4290 | Target_aarch64<size, big_endian>::do_relax( |
| 4291 | int pass, |
| 4292 | const Input_objects* input_objects, |
| 4293 | Symbol_table* symtab, |
| 4294 | Layout* layout , |
| 4295 | const Task* task) |
| 4296 | { |
| 4297 | gold_assert(!parameters->options().relocatable()); |
| 4298 | if (pass == 1) |
| 4299 | { |
| 4300 | // We don't handle negative stub_group_size right now. |
| 4301 | this->stub_group_size_ = abs(parameters->options().stub_group_size()); |
| 4302 | if (this->stub_group_size_ == 1) |
| 4303 | { |
| 4304 | // Leave room for 4096 4-byte stub entries. If we exceed that, then we |
| 4305 | // will fail to link. The user will have to relink with an explicit |
| 4306 | // group size option. |
| 4307 | this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET - |
| 4308 | 4096 * 4; |
| 4309 | } |
| 4310 | group_sections(layout, this->stub_group_size_, true, task); |
| 4311 | } |
| 4312 | else |
| 4313 | { |
| 4314 | // If this is not the first pass, addresses and file offsets have |
| 4315 | // been reset at this point, set them here. |
| 4316 | for (Stub_table_iterator sp = this->stub_tables_.begin(); |
| 4317 | sp != this->stub_tables_.end(); ++sp) |
| 4318 | { |
| 4319 | The_stub_table* stt = *sp; |
| 4320 | The_aarch64_input_section* owner = stt->owner(); |
| 4321 | off_t off = align_address(owner->original_size(), |
| 4322 | stt->addralign()); |
| 4323 | stt->set_address_and_file_offset(owner->address() + off, |
| 4324 | owner->offset() + off); |
| 4325 | } |
| 4326 | } |
| 4327 | |
| 4328 | // Scan relocs for relocation stubs |
| 4329 | for (Input_objects::Relobj_iterator op = input_objects->relobj_begin(); |
| 4330 | op != input_objects->relobj_end(); |
| 4331 | ++op) |
| 4332 | { |
| 4333 | The_aarch64_relobj* aarch64_relobj = |
| 4334 | static_cast<The_aarch64_relobj*>(*op); |
| 4335 | // Lock the object so we can read from it. This is only called |
| 4336 | // single-threaded from Layout::finalize, so it is OK to lock. |
| 4337 | Task_lock_obj<Object> tl(task, aarch64_relobj); |
| 4338 | aarch64_relobj->scan_sections_for_stubs(this, symtab, layout); |
| 4339 | } |
| 4340 | |
| 4341 | bool any_stub_table_changed = false; |
| 4342 | for (Stub_table_iterator siter = this->stub_tables_.begin(); |
| 4343 | siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter) |
| 4344 | { |
| 4345 | The_stub_table* stub_table = *siter; |
| 4346 | if (stub_table->update_data_size_changed_p()) |
| 4347 | { |
| 4348 | The_aarch64_input_section* owner = stub_table->owner(); |
| 4349 | uint64_t address = owner->address(); |
| 4350 | off_t offset = owner->offset(); |
| 4351 | owner->reset_address_and_file_offset(); |
| 4352 | owner->set_address_and_file_offset(address, offset); |
| 4353 | |
| 4354 | any_stub_table_changed = true; |
| 4355 | } |
| 4356 | } |
| 4357 | |
| 4358 | // Do not continue relaxation. |
| 4359 | bool continue_relaxation = any_stub_table_changed; |
| 4360 | if (!continue_relaxation) |
| 4361 | for (Stub_table_iterator sp = this->stub_tables_.begin(); |
| 4362 | (sp != this->stub_tables_.end()); |
| 4363 | ++sp) |
| 4364 | (*sp)->finalize_stubs(); |
| 4365 | |
| 4366 | return continue_relaxation; |
| 4367 | } |
| 4368 | |
| 4369 | |
| 4370 | // Make a new Stub_table. |
| 4371 | |
| 4372 | template<int size, bool big_endian> |
| 4373 | Stub_table<size, big_endian>* |
| 4374 | Target_aarch64<size, big_endian>::new_stub_table( |
| 4375 | AArch64_input_section<size, big_endian>* owner) |
| 4376 | { |
| 4377 | Stub_table<size, big_endian>* stub_table = |
| 4378 | new Stub_table<size, big_endian>(owner); |
| 4379 | stub_table->set_address(align_address( |
| 4380 | owner->address() + owner->data_size(), 8)); |
| 4381 | stub_table->set_file_offset(owner->offset() + owner->data_size()); |
| 4382 | stub_table->finalize_data_size(); |
| 4383 | |
| 4384 | this->stub_tables_.push_back(stub_table); |
| 4385 | |
| 4386 | return stub_table; |
| 4387 | } |
| 4388 | |
| 4389 | |
| 4390 | template<int size, bool big_endian> |
| 4391 | uint64_t |
| 4392 | Target_aarch64<size, big_endian>::do_reloc_addend( |
| 4393 | void* arg, unsigned int r_type, uint64_t) const |
| 4394 | { |
| 4395 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); |
| 4396 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); |
| 4397 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); |
| 4398 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); |
| 4399 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
| 4400 | gold_assert(psymval->is_tls_symbol()); |
| 4401 | // The value of a TLS symbol is the offset in the TLS segment. |
| 4402 | return psymval->value(ti.object, 0); |
| 4403 | } |
| 4404 | |
| 4405 | // Return the number of entries in the PLT. |
| 4406 | |
| 4407 | template<int size, bool big_endian> |
| 4408 | unsigned int |
| 4409 | Target_aarch64<size, big_endian>::plt_entry_count() const |
| 4410 | { |
| 4411 | if (this->plt_ == NULL) |
| 4412 | return 0; |
| 4413 | return this->plt_->entry_count(); |
| 4414 | } |
| 4415 | |
| 4416 | // Return the offset of the first non-reserved PLT entry. |
| 4417 | |
| 4418 | template<int size, bool big_endian> |
| 4419 | unsigned int |
| 4420 | Target_aarch64<size, big_endian>::first_plt_entry_offset() const |
| 4421 | { |
| 4422 | return this->plt_->first_plt_entry_offset(); |
| 4423 | } |
| 4424 | |
| 4425 | // Return the size of each PLT entry. |
| 4426 | |
| 4427 | template<int size, bool big_endian> |
| 4428 | unsigned int |
| 4429 | Target_aarch64<size, big_endian>::plt_entry_size() const |
| 4430 | { |
| 4431 | return this->plt_->get_plt_entry_size(); |
| 4432 | } |
| 4433 | |
| 4434 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
| 4435 | |
| 4436 | template<int size, bool big_endian> |
| 4437 | void |
| 4438 | Target_aarch64<size, big_endian>::define_tls_base_symbol( |
| 4439 | Symbol_table* symtab, Layout* layout) |
| 4440 | { |
| 4441 | if (this->tls_base_symbol_defined_) |
| 4442 | return; |
| 4443 | |
| 4444 | Output_segment* tls_segment = layout->tls_segment(); |
| 4445 | if (tls_segment != NULL) |
| 4446 | { |
| 4447 | // _TLS_MODULE_BASE_ always points to the beginning of tls segment. |
| 4448 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
| 4449 | Symbol_table::PREDEFINED, |
| 4450 | tls_segment, 0, 0, |
| 4451 | elfcpp::STT_TLS, |
| 4452 | elfcpp::STB_LOCAL, |
| 4453 | elfcpp::STV_HIDDEN, 0, |
| 4454 | Symbol::SEGMENT_START, |
| 4455 | true); |
| 4456 | } |
| 4457 | this->tls_base_symbol_defined_ = true; |
| 4458 | } |
| 4459 | |
| 4460 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
| 4461 | |
| 4462 | template<int size, bool big_endian> |
| 4463 | void |
| 4464 | Target_aarch64<size, big_endian>::reserve_tlsdesc_entries( |
| 4465 | Symbol_table* symtab, Layout* layout) |
| 4466 | { |
| 4467 | if (this->plt_ == NULL) |
| 4468 | this->make_plt_section(symtab, layout); |
| 4469 | |
| 4470 | if (!this->plt_->has_tlsdesc_entry()) |
| 4471 | { |
| 4472 | // Allocate the TLSDESC_GOT entry. |
| 4473 | Output_data_got_aarch64<size, big_endian>* got = |
| 4474 | this->got_section(symtab, layout); |
| 4475 | unsigned int got_offset = got->add_constant(0); |
| 4476 | |
| 4477 | // Allocate the TLSDESC_PLT entry. |
| 4478 | this->plt_->reserve_tlsdesc_entry(got_offset); |
| 4479 | } |
| 4480 | } |
| 4481 | |
| 4482 | // Create a GOT entry for the TLS module index. |
| 4483 | |
| 4484 | template<int size, bool big_endian> |
| 4485 | unsigned int |
| 4486 | Target_aarch64<size, big_endian>::got_mod_index_entry( |
| 4487 | Symbol_table* symtab, Layout* layout, |
| 4488 | Sized_relobj_file<size, big_endian>* object) |
| 4489 | { |
| 4490 | if (this->got_mod_index_offset_ == -1U) |
| 4491 | { |
| 4492 | gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| 4493 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| 4494 | Output_data_got_aarch64<size, big_endian>* got = |
| 4495 | this->got_section(symtab, layout); |
| 4496 | unsigned int got_offset = got->add_constant(0); |
| 4497 | rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got, |
| 4498 | got_offset, 0); |
| 4499 | got->add_constant(0); |
| 4500 | this->got_mod_index_offset_ = got_offset; |
| 4501 | } |
| 4502 | return this->got_mod_index_offset_; |
| 4503 | } |
| 4504 | |
| 4505 | // Optimize the TLS relocation type based on what we know about the |
| 4506 | // symbol. IS_FINAL is true if the final address of this symbol is |
| 4507 | // known at link time. |
| 4508 | |
| 4509 | template<int size, bool big_endian> |
| 4510 | tls::Tls_optimization |
| 4511 | Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final, |
| 4512 | int r_type) |
| 4513 | { |
| 4514 | // If we are generating a shared library, then we can't do anything |
| 4515 | // in the linker |
| 4516 | if (parameters->options().shared()) |
| 4517 | return tls::TLSOPT_NONE; |
| 4518 | |
| 4519 | switch (r_type) |
| 4520 | { |
| 4521 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 4522 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 4523 | case elfcpp::R_AARCH64_TLSDESC_LD_PREL19: |
| 4524 | case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21: |
| 4525 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 4526 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 4527 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 4528 | case elfcpp::R_AARCH64_TLSDESC_OFF_G1: |
| 4529 | case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC: |
| 4530 | case elfcpp::R_AARCH64_TLSDESC_LDR: |
| 4531 | case elfcpp::R_AARCH64_TLSDESC_ADD: |
| 4532 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 4533 | // These are General-Dynamic which permits fully general TLS |
| 4534 | // access. Since we know that we are generating an executable, |
| 4535 | // we can convert this to Initial-Exec. If we also know that |
| 4536 | // this is a local symbol, we can further switch to Local-Exec. |
| 4537 | if (is_final) |
| 4538 | return tls::TLSOPT_TO_LE; |
| 4539 | return tls::TLSOPT_TO_IE; |
| 4540 | |
| 4541 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 4542 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 4543 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 4544 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 4545 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 4546 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 4547 | // These are Local-Dynamic, which refer to local symbols in the |
| 4548 | // dynamic TLS block. Since we know that we generating an |
| 4549 | // executable, we can switch to Local-Exec. |
| 4550 | return tls::TLSOPT_TO_LE; |
| 4551 | |
| 4552 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1: |
| 4553 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC: |
| 4554 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 4555 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 4556 | case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19: |
| 4557 | // These are Initial-Exec relocs which get the thread offset |
| 4558 | // from the GOT. If we know that we are linking against the |
| 4559 | // local symbol, we can switch to Local-Exec, which links the |
| 4560 | // thread offset into the instruction. |
| 4561 | if (is_final) |
| 4562 | return tls::TLSOPT_TO_LE; |
| 4563 | return tls::TLSOPT_NONE; |
| 4564 | |
| 4565 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 4566 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 4567 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 4568 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 4569 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 4570 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 4571 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 4572 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 4573 | // When we already have Local-Exec, there is nothing further we |
| 4574 | // can do. |
| 4575 | return tls::TLSOPT_NONE; |
| 4576 | |
| 4577 | default: |
| 4578 | gold_unreachable(); |
| 4579 | } |
| 4580 | } |
| 4581 | |
| 4582 | // Returns true if this relocation type could be that of a function pointer. |
| 4583 | |
| 4584 | template<int size, bool big_endian> |
| 4585 | inline bool |
| 4586 | Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc( |
| 4587 | unsigned int r_type) |
| 4588 | { |
| 4589 | switch (r_type) |
| 4590 | { |
| 4591 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: |
| 4592 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: |
| 4593 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: |
| 4594 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 4595 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 4596 | { |
| 4597 | return true; |
| 4598 | } |
| 4599 | } |
| 4600 | return false; |
| 4601 | } |
| 4602 | |
| 4603 | // For safe ICF, scan a relocation for a local symbol to check if it |
| 4604 | // corresponds to a function pointer being taken. In that case mark |
| 4605 | // the function whose pointer was taken as not foldable. |
| 4606 | |
| 4607 | template<int size, bool big_endian> |
| 4608 | inline bool |
| 4609 | Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer( |
| 4610 | Symbol_table* , |
| 4611 | Layout* , |
| 4612 | Target_aarch64<size, big_endian>* , |
| 4613 | Sized_relobj_file<size, big_endian>* , |
| 4614 | unsigned int , |
| 4615 | Output_section* , |
| 4616 | const elfcpp::Rela<size, big_endian>& , |
| 4617 | unsigned int r_type, |
| 4618 | const elfcpp::Sym<size, big_endian>&) |
| 4619 | { |
| 4620 | // When building a shared library, do not fold any local symbols. |
| 4621 | return (parameters->options().shared() |
| 4622 | || possible_function_pointer_reloc(r_type)); |
| 4623 | } |
| 4624 | |
| 4625 | // For safe ICF, scan a relocation for a global symbol to check if it |
| 4626 | // corresponds to a function pointer being taken. In that case mark |
| 4627 | // the function whose pointer was taken as not foldable. |
| 4628 | |
| 4629 | template<int size, bool big_endian> |
| 4630 | inline bool |
| 4631 | Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer( |
| 4632 | Symbol_table* , |
| 4633 | Layout* , |
| 4634 | Target_aarch64<size, big_endian>* , |
| 4635 | Sized_relobj_file<size, big_endian>* , |
| 4636 | unsigned int , |
| 4637 | Output_section* , |
| 4638 | const elfcpp::Rela<size, big_endian>& , |
| 4639 | unsigned int r_type, |
| 4640 | Symbol* gsym) |
| 4641 | { |
| 4642 | // When building a shared library, do not fold symbols whose visibility |
| 4643 | // is hidden, internal or protected. |
| 4644 | return ((parameters->options().shared() |
| 4645 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
| 4646 | || gsym->visibility() == elfcpp::STV_PROTECTED |
| 4647 | || gsym->visibility() == elfcpp::STV_HIDDEN)) |
| 4648 | || possible_function_pointer_reloc(r_type)); |
| 4649 | } |
| 4650 | |
| 4651 | // Report an unsupported relocation against a local symbol. |
| 4652 | |
| 4653 | template<int size, bool big_endian> |
| 4654 | void |
| 4655 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local( |
| 4656 | Sized_relobj_file<size, big_endian>* object, |
| 4657 | unsigned int r_type) |
| 4658 | { |
| 4659 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 4660 | object->name().c_str(), r_type); |
| 4661 | } |
| 4662 | |
| 4663 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
| 4664 | // dynamic linker does not support it, issue an error. |
| 4665 | |
| 4666 | template<int size, bool big_endian> |
| 4667 | void |
| 4668 | Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object, |
| 4669 | unsigned int r_type) |
| 4670 | { |
| 4671 | gold_assert(r_type != elfcpp::R_AARCH64_NONE); |
| 4672 | |
| 4673 | switch (r_type) |
| 4674 | { |
| 4675 | // These are the relocation types supported by glibc for AARCH64. |
| 4676 | case elfcpp::R_AARCH64_NONE: |
| 4677 | case elfcpp::R_AARCH64_COPY: |
| 4678 | case elfcpp::R_AARCH64_GLOB_DAT: |
| 4679 | case elfcpp::R_AARCH64_JUMP_SLOT: |
| 4680 | case elfcpp::R_AARCH64_RELATIVE: |
| 4681 | case elfcpp::R_AARCH64_TLS_DTPREL64: |
| 4682 | case elfcpp::R_AARCH64_TLS_DTPMOD64: |
| 4683 | case elfcpp::R_AARCH64_TLS_TPREL64: |
| 4684 | case elfcpp::R_AARCH64_TLSDESC: |
| 4685 | case elfcpp::R_AARCH64_IRELATIVE: |
| 4686 | case elfcpp::R_AARCH64_ABS32: |
| 4687 | case elfcpp::R_AARCH64_ABS64: |
| 4688 | return; |
| 4689 | |
| 4690 | default: |
| 4691 | break; |
| 4692 | } |
| 4693 | |
| 4694 | // This prevents us from issuing more than one error per reloc |
| 4695 | // section. But we can still wind up issuing more than one |
| 4696 | // error per object file. |
| 4697 | if (this->issued_non_pic_error_) |
| 4698 | return; |
| 4699 | gold_assert(parameters->options().output_is_position_independent()); |
| 4700 | object->error(_("requires unsupported dynamic reloc; " |
| 4701 | "recompile with -fPIC")); |
| 4702 | this->issued_non_pic_error_ = true; |
| 4703 | return; |
| 4704 | } |
| 4705 | |
| 4706 | // Return whether we need to make a PLT entry for a relocation of the |
| 4707 | // given type against a STT_GNU_IFUNC symbol. |
| 4708 | |
| 4709 | template<int size, bool big_endian> |
| 4710 | bool |
| 4711 | Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( |
| 4712 | Sized_relobj_file<size, big_endian>* object, |
| 4713 | unsigned int r_type) |
| 4714 | { |
| 4715 | const AArch64_reloc_property* arp = |
| 4716 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 4717 | gold_assert(arp != NULL); |
| 4718 | |
| 4719 | int flags = arp->reference_flags(); |
| 4720 | if (flags & Symbol::TLS_REF) |
| 4721 | { |
| 4722 | gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"), |
| 4723 | object->name().c_str(), arp->name().c_str()); |
| 4724 | return false; |
| 4725 | } |
| 4726 | return flags != 0; |
| 4727 | } |
| 4728 | |
| 4729 | // Scan a relocation for a local symbol. |
| 4730 | |
| 4731 | template<int size, bool big_endian> |
| 4732 | inline void |
| 4733 | Target_aarch64<size, big_endian>::Scan::local( |
| 4734 | Symbol_table* symtab, |
| 4735 | Layout* layout, |
| 4736 | Target_aarch64<size, big_endian>* target, |
| 4737 | Sized_relobj_file<size, big_endian>* object, |
| 4738 | unsigned int data_shndx, |
| 4739 | Output_section* output_section, |
| 4740 | const elfcpp::Rela<size, big_endian>& rela, |
| 4741 | unsigned int r_type, |
| 4742 | const elfcpp::Sym<size, big_endian>& lsym, |
| 4743 | bool is_discarded) |
| 4744 | { |
| 4745 | if (is_discarded) |
| 4746 | return; |
| 4747 | |
| 4748 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 4749 | Reloc_section; |
| 4750 | Output_data_got_aarch64<size, big_endian>* got = |
| 4751 | target->got_section(symtab, layout); |
| 4752 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 4753 | |
| 4754 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
| 4755 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
| 4756 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| 4757 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
| 4758 | |
| 4759 | switch (r_type) |
| 4760 | { |
| 4761 | case elfcpp::R_AARCH64_ABS32: |
| 4762 | case elfcpp::R_AARCH64_ABS16: |
| 4763 | if (parameters->options().output_is_position_independent()) |
| 4764 | { |
| 4765 | gold_error(_("%s: unsupported reloc %u in pos independent link."), |
| 4766 | object->name().c_str(), r_type); |
| 4767 | } |
| 4768 | break; |
| 4769 | |
| 4770 | case elfcpp::R_AARCH64_ABS64: |
| 4771 | // If building a shared library or pie, we need to mark this as a dynmic |
| 4772 | // reloction, so that the dynamic loader can relocate it. |
| 4773 | if (parameters->options().output_is_position_independent()) |
| 4774 | { |
| 4775 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 4776 | rela_dyn->add_local_relative(object, r_sym, |
| 4777 | elfcpp::R_AARCH64_RELATIVE, |
| 4778 | output_section, |
| 4779 | data_shndx, |
| 4780 | rela.get_r_offset(), |
| 4781 | rela.get_r_addend(), |
| 4782 | is_ifunc); |
| 4783 | } |
| 4784 | break; |
| 4785 | |
| 4786 | case elfcpp::R_AARCH64_PREL64: |
| 4787 | case elfcpp::R_AARCH64_PREL32: |
| 4788 | case elfcpp::R_AARCH64_PREL16: |
| 4789 | break; |
| 4790 | |
| 4791 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
| 4792 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 |
| 4793 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 |
| 4794 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 |
| 4795 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 |
| 4796 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 |
| 4797 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 |
| 4798 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 |
| 4799 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 |
| 4800 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
| 4801 | break; |
| 4802 | |
| 4803 | // Control flow, pc-relative. We don't need to do anything for a relative |
| 4804 | // addressing relocation against a local symbol if it does not reference |
| 4805 | // the GOT. |
| 4806 | case elfcpp::R_AARCH64_TSTBR14: |
| 4807 | case elfcpp::R_AARCH64_CONDBR19: |
| 4808 | case elfcpp::R_AARCH64_JUMP26: |
| 4809 | case elfcpp::R_AARCH64_CALL26: |
| 4810 | break; |
| 4811 | |
| 4812 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 4813 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 4814 | { |
| 4815 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 4816 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 4817 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 4818 | break; |
| 4819 | |
| 4820 | layout->set_has_static_tls(); |
| 4821 | // Create a GOT entry for the tp-relative offset. |
| 4822 | if (!parameters->doing_static_link()) |
| 4823 | { |
| 4824 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, |
| 4825 | target->rela_dyn_section(layout), |
| 4826 | elfcpp::R_AARCH64_TLS_TPREL64); |
| 4827 | } |
| 4828 | else if (!object->local_has_got_offset(r_sym, |
| 4829 | GOT_TYPE_TLS_OFFSET)) |
| 4830 | { |
| 4831 | got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET); |
| 4832 | unsigned int got_offset = |
| 4833 | object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET); |
| 4834 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 4835 | gold_assert(addend == 0); |
| 4836 | got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64, |
| 4837 | object, r_sym); |
| 4838 | } |
| 4839 | } |
| 4840 | break; |
| 4841 | |
| 4842 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 4843 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 4844 | { |
| 4845 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 4846 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 4847 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 4848 | { |
| 4849 | layout->set_has_static_tls(); |
| 4850 | break; |
| 4851 | } |
| 4852 | gold_assert(tlsopt == tls::TLSOPT_NONE); |
| 4853 | |
| 4854 | got->add_local_pair_with_rel(object,r_sym, data_shndx, |
| 4855 | GOT_TYPE_TLS_PAIR, |
| 4856 | target->rela_dyn_section(layout), |
| 4857 | elfcpp::R_AARCH64_TLS_DTPMOD64); |
| 4858 | } |
| 4859 | break; |
| 4860 | |
| 4861 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 4862 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 4863 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 4864 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 4865 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 4866 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 4867 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 4868 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 4869 | { |
| 4870 | layout->set_has_static_tls(); |
| 4871 | bool output_is_shared = parameters->options().shared(); |
| 4872 | if (output_is_shared) |
| 4873 | gold_error(_("%s: unsupported TLSLE reloc %u in shared code."), |
| 4874 | object->name().c_str(), r_type); |
| 4875 | } |
| 4876 | break; |
| 4877 | |
| 4878 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 4879 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 4880 | { |
| 4881 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 4882 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 4883 | if (tlsopt == tls::TLSOPT_NONE) |
| 4884 | { |
| 4885 | // Create a GOT entry for the module index. |
| 4886 | target->got_mod_index_entry(symtab, layout, object); |
| 4887 | } |
| 4888 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 4889 | unsupported_reloc_local(object, r_type); |
| 4890 | } |
| 4891 | break; |
| 4892 | |
| 4893 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 4894 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 4895 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 4896 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 4897 | break; |
| 4898 | |
| 4899 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 4900 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 4901 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 4902 | { |
| 4903 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 4904 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 4905 | target->define_tls_base_symbol(symtab, layout); |
| 4906 | if (tlsopt == tls::TLSOPT_NONE) |
| 4907 | { |
| 4908 | // Create reserved PLT and GOT entries for the resolver. |
| 4909 | target->reserve_tlsdesc_entries(symtab, layout); |
| 4910 | |
| 4911 | // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc. |
| 4912 | // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT |
| 4913 | // entry needs to be in an area in .got.plt, not .got. Call |
| 4914 | // got_section to make sure the section has been created. |
| 4915 | target->got_section(symtab, layout); |
| 4916 | Output_data_got<size, big_endian>* got = |
| 4917 | target->got_tlsdesc_section(); |
| 4918 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 4919 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
| 4920 | { |
| 4921 | unsigned int got_offset = got->add_constant(0); |
| 4922 | got->add_constant(0); |
| 4923 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, |
| 4924 | got_offset); |
| 4925 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
| 4926 | // We store the arguments we need in a vector, and use |
| 4927 | // the index into the vector as the parameter to pass |
| 4928 | // to the target specific routines. |
| 4929 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); |
| 4930 | void* arg = reinterpret_cast<void*>(intarg); |
| 4931 | rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg, |
| 4932 | got, got_offset, 0); |
| 4933 | } |
| 4934 | } |
| 4935 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 4936 | unsupported_reloc_local(object, r_type); |
| 4937 | } |
| 4938 | break; |
| 4939 | |
| 4940 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 4941 | break; |
| 4942 | |
| 4943 | default: |
| 4944 | unsupported_reloc_local(object, r_type); |
| 4945 | } |
| 4946 | } |
| 4947 | |
| 4948 | |
| 4949 | // Report an unsupported relocation against a global symbol. |
| 4950 | |
| 4951 | template<int size, bool big_endian> |
| 4952 | void |
| 4953 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global( |
| 4954 | Sized_relobj_file<size, big_endian>* object, |
| 4955 | unsigned int r_type, |
| 4956 | Symbol* gsym) |
| 4957 | { |
| 4958 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 4959 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| 4960 | } |
| 4961 | |
| 4962 | template<int size, bool big_endian> |
| 4963 | inline void |
| 4964 | Target_aarch64<size, big_endian>::Scan::global( |
| 4965 | Symbol_table* symtab, |
| 4966 | Layout* layout, |
| 4967 | Target_aarch64<size, big_endian>* target, |
| 4968 | Sized_relobj_file<size, big_endian> * object, |
| 4969 | unsigned int data_shndx, |
| 4970 | Output_section* output_section, |
| 4971 | const elfcpp::Rela<size, big_endian>& rela, |
| 4972 | unsigned int r_type, |
| 4973 | Symbol* gsym) |
| 4974 | { |
| 4975 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
| 4976 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 4977 | && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| 4978 | target->make_plt_entry(symtab, layout, gsym); |
| 4979 | |
| 4980 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 4981 | Reloc_section; |
| 4982 | const AArch64_reloc_property* arp = |
| 4983 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 4984 | gold_assert(arp != NULL); |
| 4985 | |
| 4986 | switch (r_type) |
| 4987 | { |
| 4988 | case elfcpp::R_AARCH64_ABS16: |
| 4989 | case elfcpp::R_AARCH64_ABS32: |
| 4990 | case elfcpp::R_AARCH64_ABS64: |
| 4991 | { |
| 4992 | // Make a PLT entry if necessary. |
| 4993 | if (gsym->needs_plt_entry()) |
| 4994 | { |
| 4995 | target->make_plt_entry(symtab, layout, gsym); |
| 4996 | // Since this is not a PC-relative relocation, we may be |
| 4997 | // taking the address of a function. In that case we need to |
| 4998 | // set the entry in the dynamic symbol table to the address of |
| 4999 | // the PLT entry. |
| 5000 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
| 5001 | gsym->set_needs_dynsym_value(); |
| 5002 | } |
| 5003 | // Make a dynamic relocation if necessary. |
| 5004 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
| 5005 | { |
| 5006 | if (!parameters->options().output_is_position_independent() |
| 5007 | && gsym->may_need_copy_reloc()) |
| 5008 | { |
| 5009 | target->copy_reloc(symtab, layout, object, |
| 5010 | data_shndx, output_section, gsym, rela); |
| 5011 | } |
| 5012 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
| 5013 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
| 5014 | && gsym->can_use_relative_reloc(false) |
| 5015 | && !gsym->is_from_dynobj() |
| 5016 | && !gsym->is_undefined() |
| 5017 | && !gsym->is_preemptible()) |
| 5018 | { |
| 5019 | // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC |
| 5020 | // symbol. This makes a function address in a PIE executable |
| 5021 | // match the address in a shared library that it links against. |
| 5022 | Reloc_section* rela_dyn = |
| 5023 | target->rela_irelative_section(layout); |
| 5024 | unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE; |
| 5025 | rela_dyn->add_symbolless_global_addend(gsym, r_type, |
| 5026 | output_section, object, |
| 5027 | data_shndx, |
| 5028 | rela.get_r_offset(), |
| 5029 | rela.get_r_addend()); |
| 5030 | } |
| 5031 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
| 5032 | && gsym->can_use_relative_reloc(false)) |
| 5033 | { |
| 5034 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 5035 | rela_dyn->add_global_relative(gsym, |
| 5036 | elfcpp::R_AARCH64_RELATIVE, |
| 5037 | output_section, |
| 5038 | object, |
| 5039 | data_shndx, |
| 5040 | rela.get_r_offset(), |
| 5041 | rela.get_r_addend(), |
| 5042 | false); |
| 5043 | } |
| 5044 | else |
| 5045 | { |
| 5046 | check_non_pic(object, r_type); |
| 5047 | Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>* |
| 5048 | rela_dyn = target->rela_dyn_section(layout); |
| 5049 | rela_dyn->add_global( |
| 5050 | gsym, r_type, output_section, object, |
| 5051 | data_shndx, rela.get_r_offset(),rela.get_r_addend()); |
| 5052 | } |
| 5053 | } |
| 5054 | } |
| 5055 | break; |
| 5056 | |
| 5057 | case elfcpp::R_AARCH64_PREL16: |
| 5058 | case elfcpp::R_AARCH64_PREL32: |
| 5059 | case elfcpp::R_AARCH64_PREL64: |
| 5060 | // This is used to fill the GOT absolute address. |
| 5061 | if (gsym->needs_plt_entry()) |
| 5062 | { |
| 5063 | target->make_plt_entry(symtab, layout, gsym); |
| 5064 | } |
| 5065 | break; |
| 5066 | |
| 5067 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
| 5068 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 |
| 5069 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 |
| 5070 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 |
| 5071 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 |
| 5072 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 |
| 5073 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 |
| 5074 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 |
| 5075 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 |
| 5076 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
| 5077 | { |
| 5078 | if (gsym->needs_plt_entry()) |
| 5079 | target->make_plt_entry(symtab, layout, gsym); |
| 5080 | // Make a dynamic relocation if necessary. |
| 5081 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
| 5082 | { |
| 5083 | if (parameters->options().output_is_executable() |
| 5084 | && gsym->may_need_copy_reloc()) |
| 5085 | { |
| 5086 | target->copy_reloc(symtab, layout, object, |
| 5087 | data_shndx, output_section, gsym, rela); |
| 5088 | } |
| 5089 | } |
| 5090 | break; |
| 5091 | } |
| 5092 | |
| 5093 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 5094 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 5095 | { |
| 5096 | // This pair of relocations is used to access a specific GOT entry. |
| 5097 | // Note a GOT entry is an *address* to a symbol. |
| 5098 | // The symbol requires a GOT entry |
| 5099 | Output_data_got_aarch64<size, big_endian>* got = |
| 5100 | target->got_section(symtab, layout); |
| 5101 | if (gsym->final_value_is_known()) |
| 5102 | { |
| 5103 | // For a STT_GNU_IFUNC symbol we want the PLT address. |
| 5104 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| 5105 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 5106 | else |
| 5107 | got->add_global(gsym, GOT_TYPE_STANDARD); |
| 5108 | } |
| 5109 | else |
| 5110 | { |
| 5111 | // If this symbol is not fully resolved, we need to add a dynamic |
| 5112 | // relocation for it. |
| 5113 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 5114 | |
| 5115 | // Use a GLOB_DAT rather than a RELATIVE reloc if: |
| 5116 | // |
| 5117 | // 1) The symbol may be defined in some other module. |
| 5118 | // 2) We are building a shared library and this is a protected |
| 5119 | // symbol; using GLOB_DAT means that the dynamic linker can use |
| 5120 | // the address of the PLT in the main executable when appropriate |
| 5121 | // so that function address comparisons work. |
| 5122 | // 3) This is a STT_GNU_IFUNC symbol in position dependent code, |
| 5123 | // again so that function address comparisons work. |
| 5124 | if (gsym->is_from_dynobj() |
| 5125 | || gsym->is_undefined() |
| 5126 | || gsym->is_preemptible() |
| 5127 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
| 5128 | && parameters->options().shared()) |
| 5129 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 5130 | && parameters->options().output_is_position_independent())) |
| 5131 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
| 5132 | rela_dyn, elfcpp::R_AARCH64_GLOB_DAT); |
| 5133 | else |
| 5134 | { |
| 5135 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
| 5136 | // offset into the GOT, so that function pointer |
| 5137 | // comparisons work correctly. |
| 5138 | bool is_new; |
| 5139 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) |
| 5140 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); |
| 5141 | else |
| 5142 | { |
| 5143 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 5144 | // Tell the dynamic linker to use the PLT address |
| 5145 | // when resolving relocations. |
| 5146 | if (gsym->is_from_dynobj() |
| 5147 | && !parameters->options().shared()) |
| 5148 | gsym->set_needs_dynsym_value(); |
| 5149 | } |
| 5150 | if (is_new) |
| 5151 | { |
| 5152 | rela_dyn->add_global_relative( |
| 5153 | gsym, elfcpp::R_AARCH64_RELATIVE, |
| 5154 | got, |
| 5155 | gsym->got_offset(GOT_TYPE_STANDARD), |
| 5156 | 0, |
| 5157 | false); |
| 5158 | } |
| 5159 | } |
| 5160 | } |
| 5161 | break; |
| 5162 | } |
| 5163 | |
| 5164 | case elfcpp::R_AARCH64_TSTBR14: |
| 5165 | case elfcpp::R_AARCH64_CONDBR19: |
| 5166 | case elfcpp::R_AARCH64_JUMP26: |
| 5167 | case elfcpp::R_AARCH64_CALL26: |
| 5168 | { |
| 5169 | if (gsym->final_value_is_known()) |
| 5170 | break; |
| 5171 | |
| 5172 | if (gsym->is_defined() && |
| 5173 | !gsym->is_from_dynobj() && |
| 5174 | !gsym->is_preemptible()) |
| 5175 | break; |
| 5176 | |
| 5177 | // Make plt entry for function call. |
| 5178 | target->make_plt_entry(symtab, layout, gsym); |
| 5179 | break; |
| 5180 | } |
| 5181 | |
| 5182 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 5183 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic |
| 5184 | { |
| 5185 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 5186 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| 5187 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 5188 | { |
| 5189 | layout->set_has_static_tls(); |
| 5190 | break; |
| 5191 | } |
| 5192 | gold_assert(tlsopt == tls::TLSOPT_NONE); |
| 5193 | |
| 5194 | // General dynamic. |
| 5195 | Output_data_got_aarch64<size, big_endian>* got = |
| 5196 | target->got_section(symtab, layout); |
| 5197 | // Create 2 consecutive entries for module index and offset. |
| 5198 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
| 5199 | target->rela_dyn_section(layout), |
| 5200 | elfcpp::R_AARCH64_TLS_DTPMOD64, |
| 5201 | elfcpp::R_AARCH64_TLS_DTPREL64); |
| 5202 | } |
| 5203 | break; |
| 5204 | |
| 5205 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 5206 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local dynamic |
| 5207 | { |
| 5208 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 5209 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 5210 | if (tlsopt == tls::TLSOPT_NONE) |
| 5211 | { |
| 5212 | // Create a GOT entry for the module index. |
| 5213 | target->got_mod_index_entry(symtab, layout, object); |
| 5214 | } |
| 5215 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 5216 | unsupported_reloc_local(object, r_type); |
| 5217 | } |
| 5218 | break; |
| 5219 | |
| 5220 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 5221 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 5222 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 5223 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local dynamic |
| 5224 | break; |
| 5225 | |
| 5226 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 5227 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable |
| 5228 | { |
| 5229 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 5230 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| 5231 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 5232 | break; |
| 5233 | |
| 5234 | layout->set_has_static_tls(); |
| 5235 | // Create a GOT entry for the tp-relative offset. |
| 5236 | Output_data_got_aarch64<size, big_endian>* got |
| 5237 | = target->got_section(symtab, layout); |
| 5238 | if (!parameters->doing_static_link()) |
| 5239 | { |
| 5240 | got->add_global_with_rel( |
| 5241 | gsym, GOT_TYPE_TLS_OFFSET, |
| 5242 | target->rela_dyn_section(layout), |
| 5243 | elfcpp::R_AARCH64_TLS_TPREL64); |
| 5244 | } |
| 5245 | if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)) |
| 5246 | { |
| 5247 | got->add_global(gsym, GOT_TYPE_TLS_OFFSET); |
| 5248 | unsigned int got_offset = |
| 5249 | gsym->got_offset(GOT_TYPE_TLS_OFFSET); |
| 5250 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 5251 | gold_assert(addend == 0); |
| 5252 | got->add_static_reloc(got_offset, |
| 5253 | elfcpp::R_AARCH64_TLS_TPREL64, gsym); |
| 5254 | } |
| 5255 | } |
| 5256 | break; |
| 5257 | |
| 5258 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 5259 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 5260 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 5261 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 5262 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 5263 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 5264 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 5265 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: // Local executable |
| 5266 | layout->set_has_static_tls(); |
| 5267 | if (parameters->options().shared()) |
| 5268 | gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."), |
| 5269 | object->name().c_str(), r_type); |
| 5270 | break; |
| 5271 | |
| 5272 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 5273 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 5274 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor |
| 5275 | { |
| 5276 | target->define_tls_base_symbol(symtab, layout); |
| 5277 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 5278 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| 5279 | if (tlsopt == tls::TLSOPT_NONE) |
| 5280 | { |
| 5281 | // Create reserved PLT and GOT entries for the resolver. |
| 5282 | target->reserve_tlsdesc_entries(symtab, layout); |
| 5283 | |
| 5284 | // Create a double GOT entry with an R_AARCH64_TLSDESC |
| 5285 | // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT |
| 5286 | // entry needs to be in an area in .got.plt, not .got. Call |
| 5287 | // got_section to make sure the section has been created. |
| 5288 | target->got_section(symtab, layout); |
| 5289 | Output_data_got<size, big_endian>* got = |
| 5290 | target->got_tlsdesc_section(); |
| 5291 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
| 5292 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
| 5293 | elfcpp::R_AARCH64_TLSDESC, 0); |
| 5294 | } |
| 5295 | else if (tlsopt == tls::TLSOPT_TO_IE) |
| 5296 | { |
| 5297 | // Create a GOT entry for the tp-relative offset. |
| 5298 | Output_data_got<size, big_endian>* got |
| 5299 | = target->got_section(symtab, layout); |
| 5300 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
| 5301 | target->rela_dyn_section(layout), |
| 5302 | elfcpp::R_AARCH64_TLS_TPREL64); |
| 5303 | } |
| 5304 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 5305 | unsupported_reloc_global(object, r_type, gsym); |
| 5306 | } |
| 5307 | break; |
| 5308 | |
| 5309 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 5310 | break; |
| 5311 | |
| 5312 | default: |
| 5313 | gold_error(_("%s: unsupported reloc type in global scan"), |
| 5314 | aarch64_reloc_property_table-> |
| 5315 | reloc_name_in_error_message(r_type).c_str()); |
| 5316 | } |
| 5317 | return; |
| 5318 | } // End of Scan::global |
| 5319 | |
| 5320 | |
| 5321 | // Create the PLT section. |
| 5322 | template<int size, bool big_endian> |
| 5323 | void |
| 5324 | Target_aarch64<size, big_endian>::make_plt_section( |
| 5325 | Symbol_table* symtab, Layout* layout) |
| 5326 | { |
| 5327 | if (this->plt_ == NULL) |
| 5328 | { |
| 5329 | // Create the GOT section first. |
| 5330 | this->got_section(symtab, layout); |
| 5331 | |
| 5332 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
| 5333 | this->got_irelative_); |
| 5334 | |
| 5335 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
| 5336 | (elfcpp::SHF_ALLOC |
| 5337 | | elfcpp::SHF_EXECINSTR), |
| 5338 | this->plt_, ORDER_PLT, false); |
| 5339 | |
| 5340 | // Make the sh_info field of .rela.plt point to .plt. |
| 5341 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); |
| 5342 | rela_plt_os->set_info_section(this->plt_->output_section()); |
| 5343 | } |
| 5344 | } |
| 5345 | |
| 5346 | // Return the section for TLSDESC relocations. |
| 5347 | |
| 5348 | template<int size, bool big_endian> |
| 5349 | typename Target_aarch64<size, big_endian>::Reloc_section* |
| 5350 | Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const |
| 5351 | { |
| 5352 | return this->plt_section()->rela_tlsdesc(layout); |
| 5353 | } |
| 5354 | |
| 5355 | // Create a PLT entry for a global symbol. |
| 5356 | |
| 5357 | template<int size, bool big_endian> |
| 5358 | void |
| 5359 | Target_aarch64<size, big_endian>::make_plt_entry( |
| 5360 | Symbol_table* symtab, |
| 5361 | Layout* layout, |
| 5362 | Symbol* gsym) |
| 5363 | { |
| 5364 | if (gsym->has_plt_offset()) |
| 5365 | return; |
| 5366 | |
| 5367 | if (this->plt_ == NULL) |
| 5368 | this->make_plt_section(symtab, layout); |
| 5369 | |
| 5370 | this->plt_->add_entry(symtab, layout, gsym); |
| 5371 | } |
| 5372 | |
| 5373 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
| 5374 | |
| 5375 | template<int size, bool big_endian> |
| 5376 | void |
| 5377 | Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry( |
| 5378 | Symbol_table* symtab, Layout* layout, |
| 5379 | Sized_relobj_file<size, big_endian>* relobj, |
| 5380 | unsigned int local_sym_index) |
| 5381 | { |
| 5382 | if (relobj->local_has_plt_offset(local_sym_index)) |
| 5383 | return; |
| 5384 | if (this->plt_ == NULL) |
| 5385 | this->make_plt_section(symtab, layout); |
| 5386 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
| 5387 | relobj, |
| 5388 | local_sym_index); |
| 5389 | relobj->set_local_plt_offset(local_sym_index, plt_offset); |
| 5390 | } |
| 5391 | |
| 5392 | template<int size, bool big_endian> |
| 5393 | void |
| 5394 | Target_aarch64<size, big_endian>::gc_process_relocs( |
| 5395 | Symbol_table* symtab, |
| 5396 | Layout* layout, |
| 5397 | Sized_relobj_file<size, big_endian>* object, |
| 5398 | unsigned int data_shndx, |
| 5399 | unsigned int sh_type, |
| 5400 | const unsigned char* prelocs, |
| 5401 | size_t reloc_count, |
| 5402 | Output_section* output_section, |
| 5403 | bool needs_special_offset_handling, |
| 5404 | size_t local_symbol_count, |
| 5405 | const unsigned char* plocal_symbols) |
| 5406 | { |
| 5407 | if (sh_type == elfcpp::SHT_REL) |
| 5408 | { |
| 5409 | return; |
| 5410 | } |
| 5411 | |
| 5412 | gold::gc_process_relocs< |
| 5413 | size, big_endian, |
| 5414 | Target_aarch64<size, big_endian>, |
| 5415 | elfcpp::SHT_RELA, |
| 5416 | typename Target_aarch64<size, big_endian>::Scan, |
| 5417 | typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>( |
| 5418 | symtab, |
| 5419 | layout, |
| 5420 | this, |
| 5421 | object, |
| 5422 | data_shndx, |
| 5423 | prelocs, |
| 5424 | reloc_count, |
| 5425 | output_section, |
| 5426 | needs_special_offset_handling, |
| 5427 | local_symbol_count, |
| 5428 | plocal_symbols); |
| 5429 | } |
| 5430 | |
| 5431 | // Scan relocations for a section. |
| 5432 | |
| 5433 | template<int size, bool big_endian> |
| 5434 | void |
| 5435 | Target_aarch64<size, big_endian>::scan_relocs( |
| 5436 | Symbol_table* symtab, |
| 5437 | Layout* layout, |
| 5438 | Sized_relobj_file<size, big_endian>* object, |
| 5439 | unsigned int data_shndx, |
| 5440 | unsigned int sh_type, |
| 5441 | const unsigned char* prelocs, |
| 5442 | size_t reloc_count, |
| 5443 | Output_section* output_section, |
| 5444 | bool needs_special_offset_handling, |
| 5445 | size_t local_symbol_count, |
| 5446 | const unsigned char* plocal_symbols) |
| 5447 | { |
| 5448 | if (sh_type == elfcpp::SHT_REL) |
| 5449 | { |
| 5450 | gold_error(_("%s: unsupported REL reloc section"), |
| 5451 | object->name().c_str()); |
| 5452 | return; |
| 5453 | } |
| 5454 | gold::scan_relocs<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, Scan>( |
| 5455 | symtab, |
| 5456 | layout, |
| 5457 | this, |
| 5458 | object, |
| 5459 | data_shndx, |
| 5460 | prelocs, |
| 5461 | reloc_count, |
| 5462 | output_section, |
| 5463 | needs_special_offset_handling, |
| 5464 | local_symbol_count, |
| 5465 | plocal_symbols); |
| 5466 | } |
| 5467 | |
| 5468 | // Return the value to use for a dynamic which requires special |
| 5469 | // treatment. This is how we support equality comparisons of function |
| 5470 | // pointers across shared library boundaries, as described in the |
| 5471 | // processor specific ABI supplement. |
| 5472 | |
| 5473 | template<int size, bool big_endian> |
| 5474 | uint64_t |
| 5475 | Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
| 5476 | { |
| 5477 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| 5478 | return this->plt_address_for_global(gsym); |
| 5479 | } |
| 5480 | |
| 5481 | |
| 5482 | // Finalize the sections. |
| 5483 | |
| 5484 | template<int size, bool big_endian> |
| 5485 | void |
| 5486 | Target_aarch64<size, big_endian>::do_finalize_sections( |
| 5487 | Layout* layout, |
| 5488 | const Input_objects*, |
| 5489 | Symbol_table* symtab) |
| 5490 | { |
| 5491 | const Reloc_section* rel_plt = (this->plt_ == NULL |
| 5492 | ? NULL |
| 5493 | : this->plt_->rela_plt()); |
| 5494 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
| 5495 | this->rela_dyn_, true, false); |
| 5496 | |
| 5497 | // Emit any relocs we saved in an attempt to avoid generating COPY |
| 5498 | // relocs. |
| 5499 | if (this->copy_relocs_.any_saved_relocs()) |
| 5500 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); |
| 5501 | |
| 5502 | // Fill in some more dynamic tags. |
| 5503 | Output_data_dynamic* const odyn = layout->dynamic_data(); |
| 5504 | if (odyn != NULL) |
| 5505 | { |
| 5506 | if (this->plt_ != NULL |
| 5507 | && this->plt_->output_section() != NULL |
| 5508 | && this->plt_ ->has_tlsdesc_entry()) |
| 5509 | { |
| 5510 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
| 5511 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); |
| 5512 | this->got_->finalize_data_size(); |
| 5513 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, |
| 5514 | this->plt_, plt_offset); |
| 5515 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, |
| 5516 | this->got_, got_offset); |
| 5517 | } |
| 5518 | } |
| 5519 | |
| 5520 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of |
| 5521 | // the .got.plt section. |
| 5522 | Symbol* sym = this->global_offset_table_; |
| 5523 | if (sym != NULL) |
| 5524 | { |
| 5525 | uint64_t data_size = this->got_plt_->current_data_size(); |
| 5526 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
| 5527 | |
| 5528 | // If the .got section is more than 0x8000 bytes, we add |
| 5529 | // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16 |
| 5530 | // bit relocations have a greater chance of working. |
| 5531 | if (data_size >= 0x8000) |
| 5532 | symtab->get_sized_symbol<size>(sym)->set_value( |
| 5533 | symtab->get_sized_symbol<size>(sym)->value() + 0x8000); |
| 5534 | } |
| 5535 | |
| 5536 | if (parameters->doing_static_link() |
| 5537 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) |
| 5538 | { |
| 5539 | // If linking statically, make sure that the __rela_iplt symbols |
| 5540 | // were defined if necessary, even if we didn't create a PLT. |
| 5541 | static const Define_symbol_in_segment syms[] = |
| 5542 | { |
| 5543 | { |
| 5544 | "__rela_iplt_start", // name |
| 5545 | elfcpp::PT_LOAD, // segment_type |
| 5546 | elfcpp::PF_W, // segment_flags_set |
| 5547 | elfcpp::PF(0), // segment_flags_clear |
| 5548 | 0, // value |
| 5549 | 0, // size |
| 5550 | elfcpp::STT_NOTYPE, // type |
| 5551 | elfcpp::STB_GLOBAL, // binding |
| 5552 | elfcpp::STV_HIDDEN, // visibility |
| 5553 | 0, // nonvis |
| 5554 | Symbol::SEGMENT_START, // offset_from_base |
| 5555 | true // only_if_ref |
| 5556 | }, |
| 5557 | { |
| 5558 | "__rela_iplt_end", // name |
| 5559 | elfcpp::PT_LOAD, // segment_type |
| 5560 | elfcpp::PF_W, // segment_flags_set |
| 5561 | elfcpp::PF(0), // segment_flags_clear |
| 5562 | 0, // value |
| 5563 | 0, // size |
| 5564 | elfcpp::STT_NOTYPE, // type |
| 5565 | elfcpp::STB_GLOBAL, // binding |
| 5566 | elfcpp::STV_HIDDEN, // visibility |
| 5567 | 0, // nonvis |
| 5568 | Symbol::SEGMENT_START, // offset_from_base |
| 5569 | true // only_if_ref |
| 5570 | } |
| 5571 | }; |
| 5572 | |
| 5573 | symtab->define_symbols(layout, 2, syms, |
| 5574 | layout->script_options()->saw_sections_clause()); |
| 5575 | } |
| 5576 | |
| 5577 | return; |
| 5578 | } |
| 5579 | |
| 5580 | // Perform a relocation. |
| 5581 | |
| 5582 | template<int size, bool big_endian> |
| 5583 | inline bool |
| 5584 | Target_aarch64<size, big_endian>::Relocate::relocate( |
| 5585 | const Relocate_info<size, big_endian>* relinfo, |
| 5586 | Target_aarch64<size, big_endian>* target, |
| 5587 | Output_section* , |
| 5588 | size_t relnum, |
| 5589 | const elfcpp::Rela<size, big_endian>& rela, |
| 5590 | unsigned int r_type, |
| 5591 | const Sized_symbol<size>* gsym, |
| 5592 | const Symbol_value<size>* psymval, |
| 5593 | unsigned char* view, |
| 5594 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 5595 | section_size_type /* view_size */) |
| 5596 | { |
| 5597 | if (view == NULL) |
| 5598 | return true; |
| 5599 | |
| 5600 | typedef AArch64_relocate_functions<size, big_endian> Reloc; |
| 5601 | |
| 5602 | const AArch64_reloc_property* reloc_property = |
| 5603 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 5604 | |
| 5605 | if (reloc_property == NULL) |
| 5606 | { |
| 5607 | std::string reloc_name = |
| 5608 | aarch64_reloc_property_table->reloc_name_in_error_message(r_type); |
| 5609 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 5610 | _("cannot relocate %s in object file"), |
| 5611 | reloc_name.c_str()); |
| 5612 | return true; |
| 5613 | } |
| 5614 | |
| 5615 | const Sized_relobj_file<size, big_endian>* object = relinfo->object; |
| 5616 | |
| 5617 | // Pick the value to use for symbols defined in the PLT. |
| 5618 | Symbol_value<size> symval; |
| 5619 | if (gsym != NULL |
| 5620 | && gsym->use_plt_offset(reloc_property->reference_flags())) |
| 5621 | { |
| 5622 | symval.set_output_value(target->plt_address_for_global(gsym)); |
| 5623 | psymval = &symval; |
| 5624 | } |
| 5625 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
| 5626 | { |
| 5627 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 5628 | if (object->local_has_plt_offset(r_sym)) |
| 5629 | { |
| 5630 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
| 5631 | psymval = &symval; |
| 5632 | } |
| 5633 | } |
| 5634 | |
| 5635 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 5636 | |
| 5637 | // Get the GOT offset if needed. |
| 5638 | // For aarch64, the GOT pointer points to the start of the GOT section. |
| 5639 | bool have_got_offset = false; |
| 5640 | int got_offset = 0; |
| 5641 | int got_base = (target->got_ != NULL |
| 5642 | ? (target->got_->current_data_size() >= 0x8000 |
| 5643 | ? 0x8000 : 0) |
| 5644 | : 0); |
| 5645 | switch (r_type) |
| 5646 | { |
| 5647 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0: |
| 5648 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC: |
| 5649 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1: |
| 5650 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC: |
| 5651 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2: |
| 5652 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC: |
| 5653 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G3: |
| 5654 | case elfcpp::R_AARCH64_GOTREL64: |
| 5655 | case elfcpp::R_AARCH64_GOTREL32: |
| 5656 | case elfcpp::R_AARCH64_GOT_LD_PREL19: |
| 5657 | case elfcpp::R_AARCH64_LD64_GOTOFF_LO15: |
| 5658 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 5659 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 5660 | case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15: |
| 5661 | if (gsym != NULL) |
| 5662 | { |
| 5663 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| 5664 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base; |
| 5665 | } |
| 5666 | else |
| 5667 | { |
| 5668 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 5669 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
| 5670 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) |
| 5671 | - got_base); |
| 5672 | } |
| 5673 | have_got_offset = true; |
| 5674 | break; |
| 5675 | |
| 5676 | default: |
| 5677 | break; |
| 5678 | } |
| 5679 | |
| 5680 | typename Reloc::Status reloc_status = Reloc::STATUS_OKAY; |
| 5681 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
| 5682 | switch (r_type) |
| 5683 | { |
| 5684 | case elfcpp::R_AARCH64_NONE: |
| 5685 | break; |
| 5686 | |
| 5687 | case elfcpp::R_AARCH64_ABS64: |
| 5688 | reloc_status = Reloc::template rela_ua<64>( |
| 5689 | view, object, psymval, addend, reloc_property); |
| 5690 | break; |
| 5691 | |
| 5692 | case elfcpp::R_AARCH64_ABS32: |
| 5693 | reloc_status = Reloc::template rela_ua<32>( |
| 5694 | view, object, psymval, addend, reloc_property); |
| 5695 | break; |
| 5696 | |
| 5697 | case elfcpp::R_AARCH64_ABS16: |
| 5698 | reloc_status = Reloc::template rela_ua<16>( |
| 5699 | view, object, psymval, addend, reloc_property); |
| 5700 | break; |
| 5701 | |
| 5702 | case elfcpp::R_AARCH64_PREL64: |
| 5703 | reloc_status = Reloc::template pcrela_ua<64>( |
| 5704 | view, object, psymval, addend, address, reloc_property); |
| 5705 | break; |
| 5706 | |
| 5707 | case elfcpp::R_AARCH64_PREL32: |
| 5708 | reloc_status = Reloc::template pcrela_ua<32>( |
| 5709 | view, object, psymval, addend, address, reloc_property); |
| 5710 | break; |
| 5711 | |
| 5712 | case elfcpp::R_AARCH64_PREL16: |
| 5713 | reloc_status = Reloc::template pcrela_ua<16>( |
| 5714 | view, object, psymval, addend, address, reloc_property); |
| 5715 | break; |
| 5716 | |
| 5717 | case elfcpp::R_AARCH64_LD_PREL_LO19: |
| 5718 | reloc_status = Reloc::template pcrela_general<32>( |
| 5719 | view, object, psymval, addend, address, reloc_property); |
| 5720 | break; |
| 5721 | |
| 5722 | case elfcpp::R_AARCH64_ADR_PREL_LO21: |
| 5723 | reloc_status = Reloc::adr(view, object, psymval, addend, |
| 5724 | address, reloc_property); |
| 5725 | break; |
| 5726 | |
| 5727 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: |
| 5728 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: |
| 5729 | reloc_status = Reloc::adrp(view, object, psymval, addend, address, |
| 5730 | reloc_property); |
| 5731 | break; |
| 5732 | |
| 5733 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: |
| 5734 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: |
| 5735 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: |
| 5736 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: |
| 5737 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: |
| 5738 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: |
| 5739 | reloc_status = Reloc::template rela_general<32>( |
| 5740 | view, object, psymval, addend, reloc_property); |
| 5741 | break; |
| 5742 | |
| 5743 | case elfcpp::R_AARCH64_CALL26: |
| 5744 | if (this->skip_call_tls_get_addr_) |
| 5745 | { |
| 5746 | // Double check that the TLSGD insn has been optimized away. |
| 5747 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 5748 | Insntype insn = elfcpp::Swap<32, big_endian>::readval( |
| 5749 | reinterpret_cast<Insntype*>(view)); |
| 5750 | gold_assert((insn & 0xff000000) == 0x91000000); |
| 5751 | |
| 5752 | reloc_status = Reloc::STATUS_OKAY; |
| 5753 | this->skip_call_tls_get_addr_ = false; |
| 5754 | // Return false to stop further processing this reloc. |
| 5755 | return false; |
| 5756 | } |
| 5757 | // Fallthrough |
| 5758 | case elfcpp::R_AARCH64_JUMP26: |
| 5759 | if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address, |
| 5760 | gsym, psymval, object, |
| 5761 | target->stub_group_size_)) |
| 5762 | break; |
| 5763 | // Fallthrough |
| 5764 | case elfcpp::R_AARCH64_TSTBR14: |
| 5765 | case elfcpp::R_AARCH64_CONDBR19: |
| 5766 | reloc_status = Reloc::template pcrela_general<32>( |
| 5767 | view, object, psymval, addend, address, reloc_property); |
| 5768 | break; |
| 5769 | |
| 5770 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 5771 | gold_assert(have_got_offset); |
| 5772 | value = target->got_->address() + got_base + got_offset; |
| 5773 | reloc_status = Reloc::adrp(view, value + addend, address); |
| 5774 | break; |
| 5775 | |
| 5776 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 5777 | gold_assert(have_got_offset); |
| 5778 | value = target->got_->address() + got_base + got_offset; |
| 5779 | reloc_status = Reloc::template rela_general<32>( |
| 5780 | view, value, addend, reloc_property); |
| 5781 | break; |
| 5782 | |
| 5783 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 5784 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 5785 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 5786 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 5787 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 5788 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 5789 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 5790 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 5791 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 5792 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 5793 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 5794 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 5795 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 5796 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 5797 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 5798 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 5799 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 5800 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 5801 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 5802 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 5803 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 5804 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 5805 | reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type, |
| 5806 | gsym, psymval, view, address); |
| 5807 | break; |
| 5808 | |
| 5809 | // These are dynamic relocations, which are unexpected when linking. |
| 5810 | case elfcpp::R_AARCH64_COPY: |
| 5811 | case elfcpp::R_AARCH64_GLOB_DAT: |
| 5812 | case elfcpp::R_AARCH64_JUMP_SLOT: |
| 5813 | case elfcpp::R_AARCH64_RELATIVE: |
| 5814 | case elfcpp::R_AARCH64_IRELATIVE: |
| 5815 | case elfcpp::R_AARCH64_TLS_DTPREL64: |
| 5816 | case elfcpp::R_AARCH64_TLS_DTPMOD64: |
| 5817 | case elfcpp::R_AARCH64_TLS_TPREL64: |
| 5818 | case elfcpp::R_AARCH64_TLSDESC: |
| 5819 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 5820 | _("unexpected reloc %u in object file"), |
| 5821 | r_type); |
| 5822 | break; |
| 5823 | |
| 5824 | default: |
| 5825 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 5826 | _("unsupported reloc %s"), |
| 5827 | reloc_property->name().c_str()); |
| 5828 | break; |
| 5829 | } |
| 5830 | |
| 5831 | // Report any errors. |
| 5832 | switch (reloc_status) |
| 5833 | { |
| 5834 | case Reloc::STATUS_OKAY: |
| 5835 | break; |
| 5836 | case Reloc::STATUS_OVERFLOW: |
| 5837 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 5838 | _("relocation overflow in %s"), |
| 5839 | reloc_property->name().c_str()); |
| 5840 | break; |
| 5841 | case Reloc::STATUS_BAD_RELOC: |
| 5842 | gold_error_at_location( |
| 5843 | relinfo, |
| 5844 | relnum, |
| 5845 | rela.get_r_offset(), |
| 5846 | _("unexpected opcode while processing relocation %s"), |
| 5847 | reloc_property->name().c_str()); |
| 5848 | break; |
| 5849 | default: |
| 5850 | gold_unreachable(); |
| 5851 | } |
| 5852 | |
| 5853 | return true; |
| 5854 | } |
| 5855 | |
| 5856 | |
| 5857 | template<int size, bool big_endian> |
| 5858 | inline |
| 5859 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 5860 | Target_aarch64<size, big_endian>::Relocate::relocate_tls( |
| 5861 | const Relocate_info<size, big_endian>* relinfo, |
| 5862 | Target_aarch64<size, big_endian>* target, |
| 5863 | size_t relnum, |
| 5864 | const elfcpp::Rela<size, big_endian>& rela, |
| 5865 | unsigned int r_type, const Sized_symbol<size>* gsym, |
| 5866 | const Symbol_value<size>* psymval, |
| 5867 | unsigned char* view, |
| 5868 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 5869 | { |
| 5870 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 5871 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 5872 | |
| 5873 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 5874 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 5875 | const AArch64_reloc_property* reloc_property = |
| 5876 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 5877 | gold_assert(reloc_property != NULL); |
| 5878 | |
| 5879 | const bool is_final = (gsym == NULL |
| 5880 | ? !parameters->options().shared() |
| 5881 | : gsym->final_value_is_known()); |
| 5882 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 5883 | optimize_tls_reloc(is_final, r_type); |
| 5884 | |
| 5885 | Sized_relobj_file<size, big_endian>* object = relinfo->object; |
| 5886 | int tls_got_offset_type; |
| 5887 | switch (r_type) |
| 5888 | { |
| 5889 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 5890 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic |
| 5891 | { |
| 5892 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 5893 | { |
| 5894 | if (tls_segment == NULL) |
| 5895 | { |
| 5896 | gold_assert(parameters->errors()->error_count() > 0 |
| 5897 | || issue_undefined_symbol_error(gsym)); |
| 5898 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 5899 | } |
| 5900 | return tls_gd_to_le(relinfo, target, rela, r_type, view, |
| 5901 | psymval); |
| 5902 | } |
| 5903 | else if (tlsopt == tls::TLSOPT_NONE) |
| 5904 | { |
| 5905 | tls_got_offset_type = GOT_TYPE_TLS_PAIR; |
| 5906 | // Firstly get the address for the got entry. |
| 5907 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 5908 | if (gsym != NULL) |
| 5909 | { |
| 5910 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| 5911 | got_entry_address = target->got_->address() + |
| 5912 | gsym->got_offset(tls_got_offset_type); |
| 5913 | } |
| 5914 | else |
| 5915 | { |
| 5916 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 5917 | gold_assert( |
| 5918 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| 5919 | got_entry_address = target->got_->address() + |
| 5920 | object->local_got_offset(r_sym, tls_got_offset_type); |
| 5921 | } |
| 5922 | |
| 5923 | // Relocate the address into adrp/ld, adrp/add pair. |
| 5924 | switch (r_type) |
| 5925 | { |
| 5926 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 5927 | return aarch64_reloc_funcs::adrp( |
| 5928 | view, got_entry_address + addend, address); |
| 5929 | |
| 5930 | break; |
| 5931 | |
| 5932 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 5933 | return aarch64_reloc_funcs::template rela_general<32>( |
| 5934 | view, got_entry_address, addend, reloc_property); |
| 5935 | break; |
| 5936 | |
| 5937 | default: |
| 5938 | gold_unreachable(); |
| 5939 | } |
| 5940 | } |
| 5941 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 5942 | _("unsupported gd_to_ie relaxation on %u"), |
| 5943 | r_type); |
| 5944 | } |
| 5945 | break; |
| 5946 | |
| 5947 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 5948 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local-dynamic |
| 5949 | { |
| 5950 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 5951 | { |
| 5952 | if (tls_segment == NULL) |
| 5953 | { |
| 5954 | gold_assert(parameters->errors()->error_count() > 0 |
| 5955 | || issue_undefined_symbol_error(gsym)); |
| 5956 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 5957 | } |
| 5958 | return this->tls_ld_to_le(relinfo, target, rela, r_type, view, |
| 5959 | psymval); |
| 5960 | } |
| 5961 | |
| 5962 | gold_assert(tlsopt == tls::TLSOPT_NONE); |
| 5963 | // Relocate the field with the offset of the GOT entry for |
| 5964 | // the module index. |
| 5965 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 5966 | got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) + |
| 5967 | target->got_->address()); |
| 5968 | |
| 5969 | switch (r_type) |
| 5970 | { |
| 5971 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 5972 | return aarch64_reloc_funcs::adrp( |
| 5973 | view, got_entry_address + addend, address); |
| 5974 | break; |
| 5975 | |
| 5976 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 5977 | return aarch64_reloc_funcs::template rela_general<32>( |
| 5978 | view, got_entry_address, addend, reloc_property); |
| 5979 | break; |
| 5980 | |
| 5981 | default: |
| 5982 | gold_unreachable(); |
| 5983 | } |
| 5984 | } |
| 5985 | break; |
| 5986 | |
| 5987 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 5988 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 5989 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 5990 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local-dynamic |
| 5991 | { |
| 5992 | AArch64_address value = psymval->value(object, 0); |
| 5993 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 5994 | { |
| 5995 | if (tls_segment == NULL) |
| 5996 | { |
| 5997 | gold_assert(parameters->errors()->error_count() > 0 |
| 5998 | || issue_undefined_symbol_error(gsym)); |
| 5999 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6000 | } |
| 6001 | } |
| 6002 | switch (r_type) |
| 6003 | { |
| 6004 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 6005 | return aarch64_reloc_funcs::movnz(view, value + addend, |
| 6006 | reloc_property); |
| 6007 | break; |
| 6008 | |
| 6009 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 6010 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 6011 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 6012 | return aarch64_reloc_funcs::template rela_general<32>( |
| 6013 | view, value, addend, reloc_property); |
| 6014 | break; |
| 6015 | |
| 6016 | default: |
| 6017 | gold_unreachable(); |
| 6018 | } |
| 6019 | // We should never reach here. |
| 6020 | } |
| 6021 | break; |
| 6022 | |
| 6023 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 6024 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec |
| 6025 | { |
| 6026 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 6027 | { |
| 6028 | if (tls_segment == NULL) |
| 6029 | { |
| 6030 | gold_assert(parameters->errors()->error_count() > 0 |
| 6031 | || issue_undefined_symbol_error(gsym)); |
| 6032 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6033 | } |
| 6034 | return tls_ie_to_le(relinfo, target, rela, r_type, view, |
| 6035 | psymval); |
| 6036 | } |
| 6037 | tls_got_offset_type = GOT_TYPE_TLS_OFFSET; |
| 6038 | |
| 6039 | // Firstly get the address for the got entry. |
| 6040 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 6041 | if (gsym != NULL) |
| 6042 | { |
| 6043 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| 6044 | got_entry_address = target->got_->address() + |
| 6045 | gsym->got_offset(tls_got_offset_type); |
| 6046 | } |
| 6047 | else |
| 6048 | { |
| 6049 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 6050 | gold_assert( |
| 6051 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| 6052 | got_entry_address = target->got_->address() + |
| 6053 | object->local_got_offset(r_sym, tls_got_offset_type); |
| 6054 | } |
| 6055 | // Relocate the address into adrp/ld, adrp/add pair. |
| 6056 | switch (r_type) |
| 6057 | { |
| 6058 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 6059 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, |
| 6060 | address); |
| 6061 | break; |
| 6062 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 6063 | return aarch64_reloc_funcs::template rela_general<32>( |
| 6064 | view, got_entry_address, addend, reloc_property); |
| 6065 | default: |
| 6066 | gold_unreachable(); |
| 6067 | } |
| 6068 | } |
| 6069 | // We shall never reach here. |
| 6070 | break; |
| 6071 | |
| 6072 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 6073 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 6074 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 6075 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 6076 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 6077 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 6078 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 6079 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 6080 | { |
| 6081 | gold_assert(tls_segment != NULL); |
| 6082 | AArch64_address value = psymval->value(object, 0); |
| 6083 | |
| 6084 | if (!parameters->options().shared()) |
| 6085 | { |
| 6086 | AArch64_address aligned_tcb_size = |
| 6087 | align_address(target->tcb_size(), |
| 6088 | tls_segment->maximum_alignment()); |
| 6089 | value += aligned_tcb_size; |
| 6090 | switch (r_type) |
| 6091 | { |
| 6092 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 6093 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 6094 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 6095 | return aarch64_reloc_funcs::movnz(view, value + addend, |
| 6096 | reloc_property); |
| 6097 | default: |
| 6098 | return aarch64_reloc_funcs::template |
| 6099 | rela_general<32>(view, |
| 6100 | value, |
| 6101 | addend, |
| 6102 | reloc_property); |
| 6103 | } |
| 6104 | } |
| 6105 | else |
| 6106 | gold_error(_("%s: unsupported reloc %u " |
| 6107 | "in non-static TLSLE mode."), |
| 6108 | object->name().c_str(), r_type); |
| 6109 | } |
| 6110 | break; |
| 6111 | |
| 6112 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 6113 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 6114 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 6115 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 6116 | { |
| 6117 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 6118 | { |
| 6119 | if (tls_segment == NULL) |
| 6120 | { |
| 6121 | gold_assert(parameters->errors()->error_count() > 0 |
| 6122 | || issue_undefined_symbol_error(gsym)); |
| 6123 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6124 | } |
| 6125 | return tls_desc_gd_to_le(relinfo, target, rela, r_type, |
| 6126 | view, psymval); |
| 6127 | } |
| 6128 | else |
| 6129 | { |
| 6130 | tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE |
| 6131 | ? GOT_TYPE_TLS_OFFSET |
| 6132 | : GOT_TYPE_TLS_DESC); |
| 6133 | unsigned int got_tlsdesc_offset = 0; |
| 6134 | if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL |
| 6135 | && tlsopt == tls::TLSOPT_NONE) |
| 6136 | { |
| 6137 | // We created GOT entries in the .got.tlsdesc portion of the |
| 6138 | // .got.plt section, but the offset stored in the symbol is the |
| 6139 | // offset within .got.tlsdesc. |
| 6140 | got_tlsdesc_offset = (target->got_->data_size() |
| 6141 | + target->got_plt_section()->data_size()); |
| 6142 | } |
| 6143 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 6144 | if (gsym != NULL) |
| 6145 | { |
| 6146 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| 6147 | got_entry_address = target->got_->address() |
| 6148 | + got_tlsdesc_offset |
| 6149 | + gsym->got_offset(tls_got_offset_type); |
| 6150 | } |
| 6151 | else |
| 6152 | { |
| 6153 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 6154 | gold_assert( |
| 6155 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| 6156 | got_entry_address = target->got_->address() + |
| 6157 | got_tlsdesc_offset + |
| 6158 | object->local_got_offset(r_sym, tls_got_offset_type); |
| 6159 | } |
| 6160 | if (tlsopt == tls::TLSOPT_TO_IE) |
| 6161 | { |
| 6162 | if (tls_segment == NULL) |
| 6163 | { |
| 6164 | gold_assert(parameters->errors()->error_count() > 0 |
| 6165 | || issue_undefined_symbol_error(gsym)); |
| 6166 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6167 | } |
| 6168 | return tls_desc_gd_to_ie(relinfo, target, rela, r_type, |
| 6169 | view, psymval, got_entry_address, |
| 6170 | address); |
| 6171 | } |
| 6172 | |
| 6173 | // Now do tlsdesc relocation. |
| 6174 | switch (r_type) |
| 6175 | { |
| 6176 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 6177 | return aarch64_reloc_funcs::adrp(view, |
| 6178 | got_entry_address + addend, |
| 6179 | address); |
| 6180 | break; |
| 6181 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 6182 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 6183 | return aarch64_reloc_funcs::template rela_general<32>( |
| 6184 | view, got_entry_address, addend, reloc_property); |
| 6185 | break; |
| 6186 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 6187 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 6188 | break; |
| 6189 | default: |
| 6190 | gold_unreachable(); |
| 6191 | } |
| 6192 | } |
| 6193 | } |
| 6194 | break; |
| 6195 | |
| 6196 | default: |
| 6197 | gold_error(_("%s: unsupported TLS reloc %u."), |
| 6198 | object->name().c_str(), r_type); |
| 6199 | } |
| 6200 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6201 | } // End of relocate_tls. |
| 6202 | |
| 6203 | |
| 6204 | template<int size, bool big_endian> |
| 6205 | inline |
| 6206 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 6207 | Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le( |
| 6208 | const Relocate_info<size, big_endian>* relinfo, |
| 6209 | Target_aarch64<size, big_endian>* target, |
| 6210 | const elfcpp::Rela<size, big_endian>& rela, |
| 6211 | unsigned int r_type, |
| 6212 | unsigned char* view, |
| 6213 | const Symbol_value<size>* psymval) |
| 6214 | { |
| 6215 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 6216 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 6217 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 6218 | |
| 6219 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 6220 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); |
| 6221 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); |
| 6222 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); |
| 6223 | |
| 6224 | if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC) |
| 6225 | { |
| 6226 | // This is the 2nd relocs, optimization should already have been |
| 6227 | // done. |
| 6228 | gold_assert((insn1 & 0xfff00000) == 0x91400000); |
| 6229 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 6230 | } |
| 6231 | |
| 6232 | // The original sequence is - |
| 6233 | // 90000000 adrp x0, 0 <main> |
| 6234 | // 91000000 add x0, x0, #0x0 |
| 6235 | // 94000000 bl 0 <__tls_get_addr> |
| 6236 | // optimized to sequence - |
| 6237 | // d53bd040 mrs x0, tpidr_el0 |
| 6238 | // 91400000 add x0, x0, #0x0, lsl #12 |
| 6239 | // 91000000 add x0, x0, #0x0 |
| 6240 | |
| 6241 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we |
| 6242 | // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we |
| 6243 | // have to change "bl tls_get_addr", which does not have a corresponding tls |
| 6244 | // relocation type. So before proceeding, we need to make sure compiler |
| 6245 | // does not change the sequence. |
| 6246 | if(!(insn1 == 0x90000000 // adrp x0,0 |
| 6247 | && insn2 == 0x91000000 // add x0, x0, #0x0 |
| 6248 | && insn3 == 0x94000000)) // bl 0 |
| 6249 | { |
| 6250 | // Ideally we should give up gd_to_le relaxation and do gd access. |
| 6251 | // However the gd_to_le relaxation decision has been made early |
| 6252 | // in the scan stage, where we did not allocate any GOT entry for |
| 6253 | // this symbol. Therefore we have to exit and report error now. |
| 6254 | gold_error(_("unexpected reloc insn sequence while relaxing " |
| 6255 | "tls gd to le for reloc %u."), r_type); |
| 6256 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6257 | } |
| 6258 | |
| 6259 | // Write new insns. |
| 6260 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 |
| 6261 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 |
| 6262 | insn3 = 0x91000000; // add x0, x0, #0x0 |
| 6263 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); |
| 6264 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); |
| 6265 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); |
| 6266 | |
| 6267 | // Calculate tprel value. |
| 6268 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 6269 | gold_assert(tls_segment != NULL); |
| 6270 | AArch64_address value = psymval->value(relinfo->object, 0); |
| 6271 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6272 | AArch64_address aligned_tcb_size = |
| 6273 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 6274 | AArch64_address x = value + aligned_tcb_size; |
| 6275 | |
| 6276 | // After new insns are written, apply TLSLE relocs. |
| 6277 | const AArch64_reloc_property* rp1 = |
| 6278 | aarch64_reloc_property_table->get_reloc_property( |
| 6279 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); |
| 6280 | const AArch64_reloc_property* rp2 = |
| 6281 | aarch64_reloc_property_table->get_reloc_property( |
| 6282 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); |
| 6283 | gold_assert(rp1 != NULL && rp2 != NULL); |
| 6284 | |
| 6285 | typename aarch64_reloc_funcs::Status s1 = |
| 6286 | aarch64_reloc_funcs::template rela_general<32>(view + 4, |
| 6287 | x, |
| 6288 | addend, |
| 6289 | rp1); |
| 6290 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) |
| 6291 | return s1; |
| 6292 | |
| 6293 | typename aarch64_reloc_funcs::Status s2 = |
| 6294 | aarch64_reloc_funcs::template rela_general<32>(view + 8, |
| 6295 | x, |
| 6296 | addend, |
| 6297 | rp2); |
| 6298 | |
| 6299 | this->skip_call_tls_get_addr_ = true; |
| 6300 | return s2; |
| 6301 | } // End of tls_gd_to_le |
| 6302 | |
| 6303 | |
| 6304 | template<int size, bool big_endian> |
| 6305 | inline |
| 6306 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 6307 | Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le( |
| 6308 | const Relocate_info<size, big_endian>* relinfo, |
| 6309 | Target_aarch64<size, big_endian>* target, |
| 6310 | const elfcpp::Rela<size, big_endian>& rela, |
| 6311 | unsigned int r_type, |
| 6312 | unsigned char* view, |
| 6313 | const Symbol_value<size>* psymval) |
| 6314 | { |
| 6315 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 6316 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 6317 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 6318 | |
| 6319 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 6320 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); |
| 6321 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); |
| 6322 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); |
| 6323 | |
| 6324 | if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC) |
| 6325 | { |
| 6326 | // This is the 2nd relocs, optimization should already have been |
| 6327 | // done. |
| 6328 | gold_assert((insn1 & 0xfff00000) == 0x91400000); |
| 6329 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 6330 | } |
| 6331 | |
| 6332 | // The original sequence is - |
| 6333 | // 90000000 adrp x0, 0 <main> |
| 6334 | // 91000000 add x0, x0, #0x0 |
| 6335 | // 94000000 bl 0 <__tls_get_addr> |
| 6336 | // optimized to sequence - |
| 6337 | // d53bd040 mrs x0, tpidr_el0 |
| 6338 | // 91400000 add x0, x0, #0x0, lsl #12 |
| 6339 | // 91000000 add x0, x0, #0x0 |
| 6340 | |
| 6341 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we |
| 6342 | // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we |
| 6343 | // have to change "bl tls_get_addr", which does not have a corresponding tls |
| 6344 | // relocation type. So before proceeding, we need to make sure compiler |
| 6345 | // does not change the sequence. |
| 6346 | if(!(insn1 == 0x90000000 // adrp x0,0 |
| 6347 | && insn2 == 0x91000000 // add x0, x0, #0x0 |
| 6348 | && insn3 == 0x94000000)) // bl 0 |
| 6349 | { |
| 6350 | // Ideally we should give up gd_to_le relaxation and do gd access. |
| 6351 | // However the gd_to_le relaxation decision has been made early |
| 6352 | // in the scan stage, where we did not allocate any GOT entry for |
| 6353 | // this symbol. Therefore we have to exit and report error now. |
| 6354 | gold_error(_("unexpected reloc insn sequence while relaxing " |
| 6355 | "tls gd to le for reloc %u."), r_type); |
| 6356 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6357 | } |
| 6358 | |
| 6359 | // Write new insns. |
| 6360 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 |
| 6361 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 |
| 6362 | insn3 = 0x91000000; // add x0, x0, #0x0 |
| 6363 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); |
| 6364 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); |
| 6365 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); |
| 6366 | |
| 6367 | // Calculate tprel value. |
| 6368 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 6369 | gold_assert(tls_segment != NULL); |
| 6370 | AArch64_address value = psymval->value(relinfo->object, 0); |
| 6371 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6372 | AArch64_address aligned_tcb_size = |
| 6373 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 6374 | AArch64_address x = value + aligned_tcb_size; |
| 6375 | |
| 6376 | // After new insns are written, apply TLSLE relocs. |
| 6377 | const AArch64_reloc_property* rp1 = |
| 6378 | aarch64_reloc_property_table->get_reloc_property( |
| 6379 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); |
| 6380 | const AArch64_reloc_property* rp2 = |
| 6381 | aarch64_reloc_property_table->get_reloc_property( |
| 6382 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); |
| 6383 | gold_assert(rp1 != NULL && rp2 != NULL); |
| 6384 | |
| 6385 | typename aarch64_reloc_funcs::Status s1 = |
| 6386 | aarch64_reloc_funcs::template rela_general<32>(view + 4, |
| 6387 | x, |
| 6388 | addend, |
| 6389 | rp1); |
| 6390 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) |
| 6391 | return s1; |
| 6392 | |
| 6393 | typename aarch64_reloc_funcs::Status s2 = |
| 6394 | aarch64_reloc_funcs::template rela_general<32>(view + 8, |
| 6395 | x, |
| 6396 | addend, |
| 6397 | rp2); |
| 6398 | |
| 6399 | this->skip_call_tls_get_addr_ = true; |
| 6400 | return s2; |
| 6401 | |
| 6402 | } // End of tls_ld_to_le |
| 6403 | |
| 6404 | template<int size, bool big_endian> |
| 6405 | inline |
| 6406 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 6407 | Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le( |
| 6408 | const Relocate_info<size, big_endian>* relinfo, |
| 6409 | Target_aarch64<size, big_endian>* target, |
| 6410 | const elfcpp::Rela<size, big_endian>& rela, |
| 6411 | unsigned int r_type, |
| 6412 | unsigned char* view, |
| 6413 | const Symbol_value<size>* psymval) |
| 6414 | { |
| 6415 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 6416 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 6417 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 6418 | |
| 6419 | AArch64_address value = psymval->value(relinfo->object, 0); |
| 6420 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 6421 | AArch64_address aligned_tcb_address = |
| 6422 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 6423 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6424 | AArch64_address x = value + addend + aligned_tcb_address; |
| 6425 | // "x" is the offset to tp, we can only do this if x is within |
| 6426 | // range [0, 2^32-1] |
| 6427 | if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0))) |
| 6428 | { |
| 6429 | gold_error(_("TLS variable referred by reloc %u is too far from TP."), |
| 6430 | r_type); |
| 6431 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6432 | } |
| 6433 | |
| 6434 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 6435 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); |
| 6436 | unsigned int regno; |
| 6437 | Insntype newinsn; |
| 6438 | if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21) |
| 6439 | { |
| 6440 | // Generate movz. |
| 6441 | regno = (insn & 0x1f); |
| 6442 | newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5); |
| 6443 | } |
| 6444 | else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC) |
| 6445 | { |
| 6446 | // Generate movk. |
| 6447 | regno = (insn & 0x1f); |
| 6448 | gold_assert(regno == ((insn >> 5) & 0x1f)); |
| 6449 | newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5); |
| 6450 | } |
| 6451 | else |
| 6452 | gold_unreachable(); |
| 6453 | |
| 6454 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| 6455 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 6456 | } // End of tls_ie_to_le |
| 6457 | |
| 6458 | |
| 6459 | template<int size, bool big_endian> |
| 6460 | inline |
| 6461 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 6462 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le( |
| 6463 | const Relocate_info<size, big_endian>* relinfo, |
| 6464 | Target_aarch64<size, big_endian>* target, |
| 6465 | const elfcpp::Rela<size, big_endian>& rela, |
| 6466 | unsigned int r_type, |
| 6467 | unsigned char* view, |
| 6468 | const Symbol_value<size>* psymval) |
| 6469 | { |
| 6470 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 6471 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 6472 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 6473 | |
| 6474 | // TLSDESC-GD sequence is like: |
| 6475 | // adrp x0, :tlsdesc:v1 |
| 6476 | // ldr x1, [x0, #:tlsdesc_lo12:v1] |
| 6477 | // add x0, x0, :tlsdesc_lo12:v1 |
| 6478 | // .tlsdesccall v1 |
| 6479 | // blr x1 |
| 6480 | // After desc_gd_to_le optimization, the sequence will be like: |
| 6481 | // movz x0, #0x0, lsl #16 |
| 6482 | // movk x0, #0x10 |
| 6483 | // nop |
| 6484 | // nop |
| 6485 | |
| 6486 | // Calculate tprel value. |
| 6487 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 6488 | gold_assert(tls_segment != NULL); |
| 6489 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 6490 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6491 | AArch64_address value = psymval->value(relinfo->object, addend); |
| 6492 | AArch64_address aligned_tcb_size = |
| 6493 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 6494 | AArch64_address x = value + aligned_tcb_size; |
| 6495 | // x is the offset to tp, we can only do this if x is within range |
| 6496 | // [0, 2^32-1]. If x is out of range, fail and exit. |
| 6497 | if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0) |
| 6498 | { |
| 6499 | gold_error(_("TLS variable referred by reloc %u is too far from TP. " |
| 6500 | "We Can't do gd_to_le relaxation.\n"), r_type); |
| 6501 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 6502 | } |
| 6503 | Insntype newinsn; |
| 6504 | switch (r_type) |
| 6505 | { |
| 6506 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 6507 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 6508 | // Change to nop |
| 6509 | newinsn = 0xd503201f; |
| 6510 | break; |
| 6511 | |
| 6512 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 6513 | // Change to movz. |
| 6514 | newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5); |
| 6515 | break; |
| 6516 | |
| 6517 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 6518 | // Change to movk. |
| 6519 | newinsn = 0xf2800000 | ((x & 0xffff) << 5); |
| 6520 | break; |
| 6521 | |
| 6522 | default: |
| 6523 | gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"), |
| 6524 | r_type); |
| 6525 | gold_unreachable(); |
| 6526 | } |
| 6527 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| 6528 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 6529 | } // End of tls_desc_gd_to_le |
| 6530 | |
| 6531 | |
| 6532 | template<int size, bool big_endian> |
| 6533 | inline |
| 6534 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 6535 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie( |
| 6536 | const Relocate_info<size, big_endian>* /* relinfo */, |
| 6537 | Target_aarch64<size, big_endian>* /* target */, |
| 6538 | const elfcpp::Rela<size, big_endian>& rela, |
| 6539 | unsigned int r_type, |
| 6540 | unsigned char* view, |
| 6541 | const Symbol_value<size>* /* psymval */, |
| 6542 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address, |
| 6543 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 6544 | { |
| 6545 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 6546 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 6547 | |
| 6548 | // TLSDESC-GD sequence is like: |
| 6549 | // adrp x0, :tlsdesc:v1 |
| 6550 | // ldr x1, [x0, #:tlsdesc_lo12:v1] |
| 6551 | // add x0, x0, :tlsdesc_lo12:v1 |
| 6552 | // .tlsdesccall v1 |
| 6553 | // blr x1 |
| 6554 | // After desc_gd_to_ie optimization, the sequence will be like: |
| 6555 | // adrp x0, :tlsie:v1 |
| 6556 | // ldr x0, [x0, :tlsie_lo12:v1] |
| 6557 | // nop |
| 6558 | // nop |
| 6559 | |
| 6560 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 6561 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6562 | Insntype newinsn; |
| 6563 | switch (r_type) |
| 6564 | { |
| 6565 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 6566 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 6567 | // Change to nop |
| 6568 | newinsn = 0xd503201f; |
| 6569 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| 6570 | break; |
| 6571 | |
| 6572 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 6573 | { |
| 6574 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, |
| 6575 | address); |
| 6576 | } |
| 6577 | break; |
| 6578 | |
| 6579 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 6580 | { |
| 6581 | // Set ldr target register to be x0. |
| 6582 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); |
| 6583 | insn &= 0xffffffe0; |
| 6584 | elfcpp::Swap<32, big_endian>::writeval(ip, insn); |
| 6585 | // Do relocation. |
| 6586 | const AArch64_reloc_property* reloc_property = |
| 6587 | aarch64_reloc_property_table->get_reloc_property( |
| 6588 | elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC); |
| 6589 | return aarch64_reloc_funcs::template rela_general<32>( |
| 6590 | view, got_entry_address, addend, reloc_property); |
| 6591 | } |
| 6592 | break; |
| 6593 | |
| 6594 | default: |
| 6595 | gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"), |
| 6596 | r_type); |
| 6597 | gold_unreachable(); |
| 6598 | } |
| 6599 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 6600 | } // End of tls_desc_gd_to_ie |
| 6601 | |
| 6602 | // Relocate section data. |
| 6603 | |
| 6604 | template<int size, bool big_endian> |
| 6605 | void |
| 6606 | Target_aarch64<size, big_endian>::relocate_section( |
| 6607 | const Relocate_info<size, big_endian>* relinfo, |
| 6608 | unsigned int sh_type, |
| 6609 | const unsigned char* prelocs, |
| 6610 | size_t reloc_count, |
| 6611 | Output_section* output_section, |
| 6612 | bool needs_special_offset_handling, |
| 6613 | unsigned char* view, |
| 6614 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 6615 | section_size_type view_size, |
| 6616 | const Reloc_symbol_changes* reloc_symbol_changes) |
| 6617 | { |
| 6618 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 6619 | typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate; |
| 6620 | gold::relocate_section<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, |
| 6621 | AArch64_relocate, gold::Default_comdat_behavior>( |
| 6622 | relinfo, |
| 6623 | this, |
| 6624 | prelocs, |
| 6625 | reloc_count, |
| 6626 | output_section, |
| 6627 | needs_special_offset_handling, |
| 6628 | view, |
| 6629 | address, |
| 6630 | view_size, |
| 6631 | reloc_symbol_changes); |
| 6632 | } |
| 6633 | |
| 6634 | // Return the size of a relocation while scanning during a relocatable |
| 6635 | // link. |
| 6636 | |
| 6637 | template<int size, bool big_endian> |
| 6638 | unsigned int |
| 6639 | Target_aarch64<size, big_endian>::Relocatable_size_for_reloc:: |
| 6640 | get_size_for_reloc( |
| 6641 | unsigned int , |
| 6642 | Relobj* ) |
| 6643 | { |
| 6644 | // We will never support SHT_REL relocations. |
| 6645 | gold_unreachable(); |
| 6646 | return 0; |
| 6647 | } |
| 6648 | |
| 6649 | // Scan the relocs during a relocatable link. |
| 6650 | |
| 6651 | template<int size, bool big_endian> |
| 6652 | void |
| 6653 | Target_aarch64<size, big_endian>::scan_relocatable_relocs( |
| 6654 | Symbol_table* symtab, |
| 6655 | Layout* layout, |
| 6656 | Sized_relobj_file<size, big_endian>* object, |
| 6657 | unsigned int data_shndx, |
| 6658 | unsigned int sh_type, |
| 6659 | const unsigned char* prelocs, |
| 6660 | size_t reloc_count, |
| 6661 | Output_section* output_section, |
| 6662 | bool needs_special_offset_handling, |
| 6663 | size_t local_symbol_count, |
| 6664 | const unsigned char* plocal_symbols, |
| 6665 | Relocatable_relocs* rr) |
| 6666 | { |
| 6667 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 6668 | |
| 6669 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, |
| 6670 | Relocatable_size_for_reloc> Scan_relocatable_relocs; |
| 6671 | |
| 6672 | gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, |
| 6673 | Scan_relocatable_relocs>( |
| 6674 | symtab, |
| 6675 | layout, |
| 6676 | object, |
| 6677 | data_shndx, |
| 6678 | prelocs, |
| 6679 | reloc_count, |
| 6680 | output_section, |
| 6681 | needs_special_offset_handling, |
| 6682 | local_symbol_count, |
| 6683 | plocal_symbols, |
| 6684 | rr); |
| 6685 | } |
| 6686 | |
| 6687 | // Relocate a section during a relocatable link. |
| 6688 | |
| 6689 | template<int size, bool big_endian> |
| 6690 | void |
| 6691 | Target_aarch64<size, big_endian>::relocate_relocs( |
| 6692 | const Relocate_info<size, big_endian>* relinfo, |
| 6693 | unsigned int sh_type, |
| 6694 | const unsigned char* prelocs, |
| 6695 | size_t reloc_count, |
| 6696 | Output_section* output_section, |
| 6697 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 6698 | const Relocatable_relocs* rr, |
| 6699 | unsigned char* view, |
| 6700 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 6701 | section_size_type view_size, |
| 6702 | unsigned char* reloc_view, |
| 6703 | section_size_type reloc_view_size) |
| 6704 | { |
| 6705 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 6706 | |
| 6707 | gold::relocate_relocs<size, big_endian, elfcpp::SHT_RELA>( |
| 6708 | relinfo, |
| 6709 | prelocs, |
| 6710 | reloc_count, |
| 6711 | output_section, |
| 6712 | offset_in_output_section, |
| 6713 | rr, |
| 6714 | view, |
| 6715 | view_address, |
| 6716 | view_size, |
| 6717 | reloc_view, |
| 6718 | reloc_view_size); |
| 6719 | } |
| 6720 | |
| 6721 | |
| 6722 | // The selector for aarch64 object files. |
| 6723 | |
| 6724 | template<int size, bool big_endian> |
| 6725 | class Target_selector_aarch64 : public Target_selector |
| 6726 | { |
| 6727 | public: |
| 6728 | Target_selector_aarch64(); |
| 6729 | |
| 6730 | virtual Target* |
| 6731 | do_instantiate_target() |
| 6732 | { return new Target_aarch64<size, big_endian>(); } |
| 6733 | }; |
| 6734 | |
| 6735 | template<> |
| 6736 | Target_selector_aarch64<32, true>::Target_selector_aarch64() |
| 6737 | : Target_selector(elfcpp::EM_AARCH64, 32, true, |
| 6738 | "elf32-bigaarch64", "aarch64_elf32_be_vec") |
| 6739 | { } |
| 6740 | |
| 6741 | template<> |
| 6742 | Target_selector_aarch64<32, false>::Target_selector_aarch64() |
| 6743 | : Target_selector(elfcpp::EM_AARCH64, 32, false, |
| 6744 | "elf32-littleaarch64", "aarch64_elf32_le_vec") |
| 6745 | { } |
| 6746 | |
| 6747 | template<> |
| 6748 | Target_selector_aarch64<64, true>::Target_selector_aarch64() |
| 6749 | : Target_selector(elfcpp::EM_AARCH64, 64, true, |
| 6750 | "elf64-bigaarch64", "aarch64_elf64_be_vec") |
| 6751 | { } |
| 6752 | |
| 6753 | template<> |
| 6754 | Target_selector_aarch64<64, false>::Target_selector_aarch64() |
| 6755 | : Target_selector(elfcpp::EM_AARCH64, 64, false, |
| 6756 | "elf64-littleaarch64", "aarch64_elf64_le_vec") |
| 6757 | { } |
| 6758 | |
| 6759 | Target_selector_aarch64<32, true> target_selector_aarch64elf32b; |
| 6760 | Target_selector_aarch64<32, false> target_selector_aarch64elf32; |
| 6761 | Target_selector_aarch64<64, true> target_selector_aarch64elfb; |
| 6762 | Target_selector_aarch64<64, false> target_selector_aarch64elf; |
| 6763 | |
| 6764 | } // End anonymous namespace. |