| 1 | // powerpc.cc -- powerpc target support for gold. |
| 2 | |
| 3 | // Copyright (C) 2008-2018 Free Software Foundation, Inc. |
| 4 | // Written by David S. Miller <davem@davemloft.net> |
| 5 | // and David Edelsohn <edelsohn@gnu.org> |
| 6 | |
| 7 | // This file is part of gold. |
| 8 | |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; either version 3 of the License, or |
| 12 | // (at your option) any later version. |
| 13 | |
| 14 | // This program is distributed in the hope that it will be useful, |
| 15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | // GNU General Public License for more details. |
| 18 | |
| 19 | // You should have received a copy of the GNU General Public License |
| 20 | // along with this program; if not, write to the Free Software |
| 21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 22 | // MA 02110-1301, USA. |
| 23 | |
| 24 | #include "gold.h" |
| 25 | |
| 26 | #include <set> |
| 27 | #include <algorithm> |
| 28 | #include "elfcpp.h" |
| 29 | #include "dwarf.h" |
| 30 | #include "parameters.h" |
| 31 | #include "reloc.h" |
| 32 | #include "powerpc.h" |
| 33 | #include "object.h" |
| 34 | #include "symtab.h" |
| 35 | #include "layout.h" |
| 36 | #include "output.h" |
| 37 | #include "copy-relocs.h" |
| 38 | #include "target.h" |
| 39 | #include "target-reloc.h" |
| 40 | #include "target-select.h" |
| 41 | #include "tls.h" |
| 42 | #include "errors.h" |
| 43 | #include "gc.h" |
| 44 | |
| 45 | namespace |
| 46 | { |
| 47 | |
| 48 | using namespace gold; |
| 49 | |
| 50 | template<int size, bool big_endian> |
| 51 | class Output_data_plt_powerpc; |
| 52 | |
| 53 | template<int size, bool big_endian> |
| 54 | class Output_data_brlt_powerpc; |
| 55 | |
| 56 | template<int size, bool big_endian> |
| 57 | class Output_data_got_powerpc; |
| 58 | |
| 59 | template<int size, bool big_endian> |
| 60 | class Output_data_glink; |
| 61 | |
| 62 | template<int size, bool big_endian> |
| 63 | class Stub_table; |
| 64 | |
| 65 | template<int size, bool big_endian> |
| 66 | class Output_data_save_res; |
| 67 | |
| 68 | template<int size, bool big_endian> |
| 69 | class Target_powerpc; |
| 70 | |
| 71 | struct Stub_table_owner |
| 72 | { |
| 73 | Stub_table_owner() |
| 74 | : output_section(NULL), owner(NULL) |
| 75 | { } |
| 76 | |
| 77 | Output_section* output_section; |
| 78 | const Output_section::Input_section* owner; |
| 79 | }; |
| 80 | |
| 81 | inline bool is_branch_reloc(unsigned int); |
| 82 | |
| 83 | template<int size> |
| 84 | inline bool is_plt16_reloc(unsigned int); |
| 85 | |
| 86 | // Counter incremented on every Powerpc_relobj constructed. |
| 87 | static uint32_t object_id = 0; |
| 88 | |
| 89 | template<int size, bool big_endian> |
| 90 | class Powerpc_relobj : public Sized_relobj_file<size, big_endian> |
| 91 | { |
| 92 | public: |
| 93 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 94 | typedef Unordered_set<Section_id, Section_id_hash> Section_refs; |
| 95 | typedef Unordered_map<Address, Section_refs> Access_from; |
| 96 | |
| 97 | Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset, |
| 98 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| 99 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), |
| 100 | uniq_(object_id++), special_(0), relatoc_(0), toc_(0), |
| 101 | has_small_toc_reloc_(false), opd_valid_(false), |
| 102 | e_flags_(ehdr.get_e_flags()), no_toc_opt_(), opd_ent_(), |
| 103 | access_from_map_(), has14_(), stub_table_index_(), st_other_() |
| 104 | { |
| 105 | this->set_abiversion(0); |
| 106 | } |
| 107 | |
| 108 | ~Powerpc_relobj() |
| 109 | { } |
| 110 | |
| 111 | // Read the symbols then set up st_other vector. |
| 112 | void |
| 113 | do_read_symbols(Read_symbols_data*); |
| 114 | |
| 115 | // Arrange to always relocate .toc first. |
| 116 | virtual void |
| 117 | do_relocate_sections( |
| 118 | const Symbol_table* symtab, const Layout* layout, |
| 119 | const unsigned char* pshdrs, Output_file* of, |
| 120 | typename Sized_relobj_file<size, big_endian>::Views* pviews); |
| 121 | |
| 122 | // The .toc section index. |
| 123 | unsigned int |
| 124 | toc_shndx() const |
| 125 | { |
| 126 | return this->toc_; |
| 127 | } |
| 128 | |
| 129 | // Mark .toc entry at OFF as not optimizable. |
| 130 | void |
| 131 | set_no_toc_opt(Address off) |
| 132 | { |
| 133 | if (this->no_toc_opt_.empty()) |
| 134 | this->no_toc_opt_.resize(this->section_size(this->toc_shndx()) |
| 135 | / (size / 8)); |
| 136 | off /= size / 8; |
| 137 | if (off < this->no_toc_opt_.size()) |
| 138 | this->no_toc_opt_[off] = true; |
| 139 | } |
| 140 | |
| 141 | // Mark the entire .toc as not optimizable. |
| 142 | void |
| 143 | set_no_toc_opt() |
| 144 | { |
| 145 | this->no_toc_opt_.resize(1); |
| 146 | this->no_toc_opt_[0] = true; |
| 147 | } |
| 148 | |
| 149 | // Return true if code using the .toc entry at OFF should not be edited. |
| 150 | bool |
| 151 | no_toc_opt(Address off) const |
| 152 | { |
| 153 | if (this->no_toc_opt_.empty()) |
| 154 | return false; |
| 155 | off /= size / 8; |
| 156 | if (off >= this->no_toc_opt_.size()) |
| 157 | return true; |
| 158 | return this->no_toc_opt_[off]; |
| 159 | } |
| 160 | |
| 161 | // The .got2 section shndx. |
| 162 | unsigned int |
| 163 | got2_shndx() const |
| 164 | { |
| 165 | if (size == 32) |
| 166 | return this->special_; |
| 167 | else |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | // The .opd section shndx. |
| 172 | unsigned int |
| 173 | opd_shndx() const |
| 174 | { |
| 175 | if (size == 32) |
| 176 | return 0; |
| 177 | else |
| 178 | return this->special_; |
| 179 | } |
| 180 | |
| 181 | // Init OPD entry arrays. |
| 182 | void |
| 183 | init_opd(size_t opd_size) |
| 184 | { |
| 185 | size_t count = this->opd_ent_ndx(opd_size); |
| 186 | this->opd_ent_.resize(count); |
| 187 | } |
| 188 | |
| 189 | // Return section and offset of function entry for .opd + R_OFF. |
| 190 | unsigned int |
| 191 | get_opd_ent(Address r_off, Address* value = NULL) const |
| 192 | { |
| 193 | size_t ndx = this->opd_ent_ndx(r_off); |
| 194 | gold_assert(ndx < this->opd_ent_.size()); |
| 195 | gold_assert(this->opd_ent_[ndx].shndx != 0); |
| 196 | if (value != NULL) |
| 197 | *value = this->opd_ent_[ndx].off; |
| 198 | return this->opd_ent_[ndx].shndx; |
| 199 | } |
| 200 | |
| 201 | // Set section and offset of function entry for .opd + R_OFF. |
| 202 | void |
| 203 | set_opd_ent(Address r_off, unsigned int shndx, Address value) |
| 204 | { |
| 205 | size_t ndx = this->opd_ent_ndx(r_off); |
| 206 | gold_assert(ndx < this->opd_ent_.size()); |
| 207 | this->opd_ent_[ndx].shndx = shndx; |
| 208 | this->opd_ent_[ndx].off = value; |
| 209 | } |
| 210 | |
| 211 | // Return discard flag for .opd + R_OFF. |
| 212 | bool |
| 213 | get_opd_discard(Address r_off) const |
| 214 | { |
| 215 | size_t ndx = this->opd_ent_ndx(r_off); |
| 216 | gold_assert(ndx < this->opd_ent_.size()); |
| 217 | return this->opd_ent_[ndx].discard; |
| 218 | } |
| 219 | |
| 220 | // Set discard flag for .opd + R_OFF. |
| 221 | void |
| 222 | set_opd_discard(Address r_off) |
| 223 | { |
| 224 | size_t ndx = this->opd_ent_ndx(r_off); |
| 225 | gold_assert(ndx < this->opd_ent_.size()); |
| 226 | this->opd_ent_[ndx].discard = true; |
| 227 | } |
| 228 | |
| 229 | bool |
| 230 | opd_valid() const |
| 231 | { return this->opd_valid_; } |
| 232 | |
| 233 | void |
| 234 | set_opd_valid() |
| 235 | { this->opd_valid_ = true; } |
| 236 | |
| 237 | // Examine .rela.opd to build info about function entry points. |
| 238 | void |
| 239 | scan_opd_relocs(size_t reloc_count, |
| 240 | const unsigned char* prelocs, |
| 241 | const unsigned char* plocal_syms); |
| 242 | |
| 243 | // Returns true if a code sequence loading a TOC entry can be |
| 244 | // converted into code calculating a TOC pointer relative offset. |
| 245 | bool |
| 246 | make_toc_relative(Target_powerpc<size, big_endian>* target, |
| 247 | Address* value); |
| 248 | |
| 249 | // Perform the Sized_relobj_file method, then set up opd info from |
| 250 | // .opd relocs. |
| 251 | void |
| 252 | do_read_relocs(Read_relocs_data*); |
| 253 | |
| 254 | bool |
| 255 | do_find_special_sections(Read_symbols_data* sd); |
| 256 | |
| 257 | // Adjust this local symbol value. Return false if the symbol |
| 258 | // should be discarded from the output file. |
| 259 | bool |
| 260 | do_adjust_local_symbol(Symbol_value<size>* lv) const |
| 261 | { |
| 262 | if (size == 64 && this->opd_shndx() != 0) |
| 263 | { |
| 264 | bool is_ordinary; |
| 265 | if (lv->input_shndx(&is_ordinary) != this->opd_shndx()) |
| 266 | return true; |
| 267 | if (this->get_opd_discard(lv->input_value())) |
| 268 | return false; |
| 269 | } |
| 270 | return true; |
| 271 | } |
| 272 | |
| 273 | Access_from* |
| 274 | access_from_map() |
| 275 | { return &this->access_from_map_; } |
| 276 | |
| 277 | // Add a reference from SRC_OBJ, SRC_INDX to this object's .opd |
| 278 | // section at DST_OFF. |
| 279 | void |
| 280 | add_reference(Relobj* src_obj, |
| 281 | unsigned int src_indx, |
| 282 | typename elfcpp::Elf_types<size>::Elf_Addr dst_off) |
| 283 | { |
| 284 | Section_id src_id(src_obj, src_indx); |
| 285 | this->access_from_map_[dst_off].insert(src_id); |
| 286 | } |
| 287 | |
| 288 | // Add a reference to the code section specified by the .opd entry |
| 289 | // at DST_OFF |
| 290 | void |
| 291 | add_gc_mark(typename elfcpp::Elf_types<size>::Elf_Addr dst_off) |
| 292 | { |
| 293 | size_t ndx = this->opd_ent_ndx(dst_off); |
| 294 | if (ndx >= this->opd_ent_.size()) |
| 295 | this->opd_ent_.resize(ndx + 1); |
| 296 | this->opd_ent_[ndx].gc_mark = true; |
| 297 | } |
| 298 | |
| 299 | void |
| 300 | process_gc_mark(Symbol_table* symtab) |
| 301 | { |
| 302 | for (size_t i = 0; i < this->opd_ent_.size(); i++) |
| 303 | if (this->opd_ent_[i].gc_mark) |
| 304 | { |
| 305 | unsigned int shndx = this->opd_ent_[i].shndx; |
| 306 | symtab->gc()->worklist().push_back(Section_id(this, shndx)); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | // Return offset in output GOT section that this object will use |
| 311 | // as a TOC pointer. Won't be just a constant with multi-toc support. |
| 312 | Address |
| 313 | toc_base_offset() const |
| 314 | { return 0x8000; } |
| 315 | |
| 316 | void |
| 317 | set_has_small_toc_reloc() |
| 318 | { has_small_toc_reloc_ = true; } |
| 319 | |
| 320 | bool |
| 321 | has_small_toc_reloc() const |
| 322 | { return has_small_toc_reloc_; } |
| 323 | |
| 324 | void |
| 325 | set_has_14bit_branch(unsigned int shndx) |
| 326 | { |
| 327 | if (shndx >= this->has14_.size()) |
| 328 | this->has14_.resize(shndx + 1); |
| 329 | this->has14_[shndx] = true; |
| 330 | } |
| 331 | |
| 332 | bool |
| 333 | has_14bit_branch(unsigned int shndx) const |
| 334 | { return shndx < this->has14_.size() && this->has14_[shndx]; } |
| 335 | |
| 336 | void |
| 337 | set_stub_table(unsigned int shndx, unsigned int stub_index) |
| 338 | { |
| 339 | if (shndx >= this->stub_table_index_.size()) |
| 340 | this->stub_table_index_.resize(shndx + 1, -1); |
| 341 | this->stub_table_index_[shndx] = stub_index; |
| 342 | } |
| 343 | |
| 344 | Stub_table<size, big_endian>* |
| 345 | stub_table(unsigned int shndx) |
| 346 | { |
| 347 | if (shndx < this->stub_table_index_.size()) |
| 348 | { |
| 349 | Target_powerpc<size, big_endian>* target |
| 350 | = static_cast<Target_powerpc<size, big_endian>*>( |
| 351 | parameters->sized_target<size, big_endian>()); |
| 352 | unsigned int indx = this->stub_table_index_[shndx]; |
| 353 | if (indx < target->stub_tables().size()) |
| 354 | return target->stub_tables()[indx]; |
| 355 | } |
| 356 | return NULL; |
| 357 | } |
| 358 | |
| 359 | void |
| 360 | clear_stub_table() |
| 361 | { |
| 362 | this->stub_table_index_.clear(); |
| 363 | } |
| 364 | |
| 365 | uint32_t |
| 366 | uniq() const |
| 367 | { return this->uniq_; } |
| 368 | |
| 369 | int |
| 370 | abiversion() const |
| 371 | { return this->e_flags_ & elfcpp::EF_PPC64_ABI; } |
| 372 | |
| 373 | // Set ABI version for input and output |
| 374 | void |
| 375 | set_abiversion(int ver); |
| 376 | |
| 377 | unsigned int |
| 378 | st_other (unsigned int symndx) const |
| 379 | { |
| 380 | return this->st_other_[symndx]; |
| 381 | } |
| 382 | |
| 383 | unsigned int |
| 384 | ppc64_local_entry_offset(const Symbol* sym) const |
| 385 | { return elfcpp::ppc64_decode_local_entry(sym->nonvis() >> 3); } |
| 386 | |
| 387 | unsigned int |
| 388 | ppc64_local_entry_offset(unsigned int symndx) const |
| 389 | { return elfcpp::ppc64_decode_local_entry(this->st_other_[symndx] >> 5); } |
| 390 | |
| 391 | private: |
| 392 | struct Opd_ent |
| 393 | { |
| 394 | unsigned int shndx; |
| 395 | bool discard : 1; |
| 396 | bool gc_mark : 1; |
| 397 | Address off; |
| 398 | }; |
| 399 | |
| 400 | // Return index into opd_ent_ array for .opd entry at OFF. |
| 401 | // .opd entries are 24 bytes long, but they can be spaced 16 bytes |
| 402 | // apart when the language doesn't use the last 8-byte word, the |
| 403 | // environment pointer. Thus dividing the entry section offset by |
| 404 | // 16 will give an index into opd_ent_ that works for either layout |
| 405 | // of .opd. (It leaves some elements of the vector unused when .opd |
| 406 | // entries are spaced 24 bytes apart, but we don't know the spacing |
| 407 | // until relocations are processed, and in any case it is possible |
| 408 | // for an object to have some entries spaced 16 bytes apart and |
| 409 | // others 24 bytes apart.) |
| 410 | size_t |
| 411 | opd_ent_ndx(size_t off) const |
| 412 | { return off >> 4;} |
| 413 | |
| 414 | // Per object unique identifier |
| 415 | uint32_t uniq_; |
| 416 | |
| 417 | // For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx. |
| 418 | unsigned int special_; |
| 419 | |
| 420 | // For 64-bit the .rela.toc and .toc section shdnx. |
| 421 | unsigned int relatoc_; |
| 422 | unsigned int toc_; |
| 423 | |
| 424 | // For 64-bit, whether this object uses small model relocs to access |
| 425 | // the toc. |
| 426 | bool has_small_toc_reloc_; |
| 427 | |
| 428 | // Set at the start of gc_process_relocs, when we know opd_ent_ |
| 429 | // vector is valid. The flag could be made atomic and set in |
| 430 | // do_read_relocs with memory_order_release and then tested with |
| 431 | // memory_order_acquire, potentially resulting in fewer entries in |
| 432 | // access_from_map_. |
| 433 | bool opd_valid_; |
| 434 | |
| 435 | // Header e_flags |
| 436 | elfcpp::Elf_Word e_flags_; |
| 437 | |
| 438 | // For 64-bit, an array with one entry per 64-bit word in the .toc |
| 439 | // section, set if accesses using that word cannot be optimised. |
| 440 | std::vector<bool> no_toc_opt_; |
| 441 | |
| 442 | // The first 8-byte word of an OPD entry gives the address of the |
| 443 | // entry point of the function. Relocatable object files have a |
| 444 | // relocation on this word. The following vector records the |
| 445 | // section and offset specified by these relocations. |
| 446 | std::vector<Opd_ent> opd_ent_; |
| 447 | |
| 448 | // References made to this object's .opd section when running |
| 449 | // gc_process_relocs for another object, before the opd_ent_ vector |
| 450 | // is valid for this object. |
| 451 | Access_from access_from_map_; |
| 452 | |
| 453 | // Whether input section has a 14-bit branch reloc. |
| 454 | std::vector<bool> has14_; |
| 455 | |
| 456 | // The stub table to use for a given input section. |
| 457 | std::vector<unsigned int> stub_table_index_; |
| 458 | |
| 459 | // ELF st_other field for local symbols. |
| 460 | std::vector<unsigned char> st_other_; |
| 461 | }; |
| 462 | |
| 463 | template<int size, bool big_endian> |
| 464 | class Powerpc_dynobj : public Sized_dynobj<size, big_endian> |
| 465 | { |
| 466 | public: |
| 467 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 468 | |
| 469 | Powerpc_dynobj(const std::string& name, Input_file* input_file, off_t offset, |
| 470 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| 471 | : Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr), |
| 472 | opd_shndx_(0), e_flags_(ehdr.get_e_flags()), opd_ent_() |
| 473 | { |
| 474 | this->set_abiversion(0); |
| 475 | } |
| 476 | |
| 477 | ~Powerpc_dynobj() |
| 478 | { } |
| 479 | |
| 480 | // Call Sized_dynobj::do_read_symbols to read the symbols then |
| 481 | // read .opd from a dynamic object, filling in opd_ent_ vector, |
| 482 | void |
| 483 | do_read_symbols(Read_symbols_data*); |
| 484 | |
| 485 | // The .opd section shndx. |
| 486 | unsigned int |
| 487 | opd_shndx() const |
| 488 | { |
| 489 | return this->opd_shndx_; |
| 490 | } |
| 491 | |
| 492 | // The .opd section address. |
| 493 | Address |
| 494 | opd_address() const |
| 495 | { |
| 496 | return this->opd_address_; |
| 497 | } |
| 498 | |
| 499 | // Init OPD entry arrays. |
| 500 | void |
| 501 | init_opd(size_t opd_size) |
| 502 | { |
| 503 | size_t count = this->opd_ent_ndx(opd_size); |
| 504 | this->opd_ent_.resize(count); |
| 505 | } |
| 506 | |
| 507 | // Return section and offset of function entry for .opd + R_OFF. |
| 508 | unsigned int |
| 509 | get_opd_ent(Address r_off, Address* value = NULL) const |
| 510 | { |
| 511 | size_t ndx = this->opd_ent_ndx(r_off); |
| 512 | gold_assert(ndx < this->opd_ent_.size()); |
| 513 | gold_assert(this->opd_ent_[ndx].shndx != 0); |
| 514 | if (value != NULL) |
| 515 | *value = this->opd_ent_[ndx].off; |
| 516 | return this->opd_ent_[ndx].shndx; |
| 517 | } |
| 518 | |
| 519 | // Set section and offset of function entry for .opd + R_OFF. |
| 520 | void |
| 521 | set_opd_ent(Address r_off, unsigned int shndx, Address value) |
| 522 | { |
| 523 | size_t ndx = this->opd_ent_ndx(r_off); |
| 524 | gold_assert(ndx < this->opd_ent_.size()); |
| 525 | this->opd_ent_[ndx].shndx = shndx; |
| 526 | this->opd_ent_[ndx].off = value; |
| 527 | } |
| 528 | |
| 529 | int |
| 530 | abiversion() const |
| 531 | { return this->e_flags_ & elfcpp::EF_PPC64_ABI; } |
| 532 | |
| 533 | // Set ABI version for input and output. |
| 534 | void |
| 535 | set_abiversion(int ver); |
| 536 | |
| 537 | private: |
| 538 | // Used to specify extent of executable sections. |
| 539 | struct Sec_info |
| 540 | { |
| 541 | Sec_info(Address start_, Address len_, unsigned int shndx_) |
| 542 | : start(start_), len(len_), shndx(shndx_) |
| 543 | { } |
| 544 | |
| 545 | bool |
| 546 | operator<(const Sec_info& that) const |
| 547 | { return this->start < that.start; } |
| 548 | |
| 549 | Address start; |
| 550 | Address len; |
| 551 | unsigned int shndx; |
| 552 | }; |
| 553 | |
| 554 | struct Opd_ent |
| 555 | { |
| 556 | unsigned int shndx; |
| 557 | Address off; |
| 558 | }; |
| 559 | |
| 560 | // Return index into opd_ent_ array for .opd entry at OFF. |
| 561 | size_t |
| 562 | opd_ent_ndx(size_t off) const |
| 563 | { return off >> 4;} |
| 564 | |
| 565 | // For 64-bit the .opd section shndx and address. |
| 566 | unsigned int opd_shndx_; |
| 567 | Address opd_address_; |
| 568 | |
| 569 | // Header e_flags |
| 570 | elfcpp::Elf_Word e_flags_; |
| 571 | |
| 572 | // The first 8-byte word of an OPD entry gives the address of the |
| 573 | // entry point of the function. Records the section and offset |
| 574 | // corresponding to the address. Note that in dynamic objects, |
| 575 | // offset is *not* relative to the section. |
| 576 | std::vector<Opd_ent> opd_ent_; |
| 577 | }; |
| 578 | |
| 579 | // Powerpc_copy_relocs class. Needed to peek at dynamic relocs the |
| 580 | // base class will emit. |
| 581 | |
| 582 | template<int sh_type, int size, bool big_endian> |
| 583 | class Powerpc_copy_relocs : public Copy_relocs<sh_type, size, big_endian> |
| 584 | { |
| 585 | public: |
| 586 | Powerpc_copy_relocs() |
| 587 | : Copy_relocs<sh_type, size, big_endian>(elfcpp::R_POWERPC_COPY) |
| 588 | { } |
| 589 | |
| 590 | // Emit any saved relocations which turn out to be needed. This is |
| 591 | // called after all the relocs have been scanned. |
| 592 | void |
| 593 | emit(Output_data_reloc<sh_type, true, size, big_endian>*); |
| 594 | }; |
| 595 | |
| 596 | template<int size, bool big_endian> |
| 597 | class Target_powerpc : public Sized_target<size, big_endian> |
| 598 | { |
| 599 | public: |
| 600 | typedef |
| 601 | Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section; |
| 602 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 603 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword Signed_address; |
| 604 | typedef Unordered_set<Symbol_location, Symbol_location_hash> Tocsave_loc; |
| 605 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 606 | // Offset of tp and dtp pointers from start of TLS block. |
| 607 | static const Address tp_offset = 0x7000; |
| 608 | static const Address dtp_offset = 0x8000; |
| 609 | |
| 610 | Target_powerpc() |
| 611 | : Sized_target<size, big_endian>(&powerpc_info), |
| 612 | got_(NULL), plt_(NULL), iplt_(NULL), lplt_(NULL), brlt_section_(NULL), |
| 613 | glink_(NULL), rela_dyn_(NULL), copy_relocs_(), |
| 614 | tlsld_got_offset_(-1U), |
| 615 | stub_tables_(), branch_lookup_table_(), branch_info_(), tocsave_loc_(), |
| 616 | plt_thread_safe_(false), plt_localentry0_(false), |
| 617 | plt_localentry0_init_(false), has_localentry0_(false), |
| 618 | has_tls_get_addr_opt_(false), |
| 619 | relax_failed_(false), relax_fail_count_(0), |
| 620 | stub_group_size_(0), savres_section_(0), |
| 621 | tls_get_addr_(NULL), tls_get_addr_opt_(NULL) |
| 622 | { |
| 623 | } |
| 624 | |
| 625 | // Process the relocations to determine unreferenced sections for |
| 626 | // garbage collection. |
| 627 | void |
| 628 | gc_process_relocs(Symbol_table* symtab, |
| 629 | Layout* layout, |
| 630 | Sized_relobj_file<size, big_endian>* object, |
| 631 | unsigned int data_shndx, |
| 632 | unsigned int sh_type, |
| 633 | const unsigned char* prelocs, |
| 634 | size_t reloc_count, |
| 635 | Output_section* output_section, |
| 636 | bool needs_special_offset_handling, |
| 637 | size_t local_symbol_count, |
| 638 | const unsigned char* plocal_symbols); |
| 639 | |
| 640 | // Scan the relocations to look for symbol adjustments. |
| 641 | void |
| 642 | scan_relocs(Symbol_table* symtab, |
| 643 | Layout* layout, |
| 644 | Sized_relobj_file<size, big_endian>* object, |
| 645 | unsigned int data_shndx, |
| 646 | unsigned int sh_type, |
| 647 | const unsigned char* prelocs, |
| 648 | size_t reloc_count, |
| 649 | Output_section* output_section, |
| 650 | bool needs_special_offset_handling, |
| 651 | size_t local_symbol_count, |
| 652 | const unsigned char* plocal_symbols); |
| 653 | |
| 654 | // Map input .toc section to output .got section. |
| 655 | const char* |
| 656 | do_output_section_name(const Relobj*, const char* name, size_t* plen) const |
| 657 | { |
| 658 | if (size == 64 && strcmp(name, ".toc") == 0) |
| 659 | { |
| 660 | *plen = 4; |
| 661 | return ".got"; |
| 662 | } |
| 663 | return NULL; |
| 664 | } |
| 665 | |
| 666 | // Provide linker defined save/restore functions. |
| 667 | void |
| 668 | define_save_restore_funcs(Layout*, Symbol_table*); |
| 669 | |
| 670 | // No stubs unless a final link. |
| 671 | bool |
| 672 | do_may_relax() const |
| 673 | { return !parameters->options().relocatable(); } |
| 674 | |
| 675 | bool |
| 676 | do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*); |
| 677 | |
| 678 | void |
| 679 | do_plt_fde_location(const Output_data*, unsigned char*, |
| 680 | uint64_t*, off_t*) const; |
| 681 | |
| 682 | // Stash info about branches, for stub generation. |
| 683 | void |
| 684 | push_branch(Powerpc_relobj<size, big_endian>* ppc_object, |
| 685 | unsigned int data_shndx, Address r_offset, |
| 686 | unsigned int r_type, unsigned int r_sym, Address addend) |
| 687 | { |
| 688 | Branch_info info(ppc_object, data_shndx, r_offset, r_type, r_sym, addend); |
| 689 | this->branch_info_.push_back(info); |
| 690 | if (r_type == elfcpp::R_POWERPC_REL14 |
| 691 | || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN |
| 692 | || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN) |
| 693 | ppc_object->set_has_14bit_branch(data_shndx); |
| 694 | } |
| 695 | |
| 696 | // Return whether the last branch is a plt call, and if so, mark the |
| 697 | // branch as having an R_PPC64_TOCSAVE. |
| 698 | bool |
| 699 | mark_pltcall(Powerpc_relobj<size, big_endian>* ppc_object, |
| 700 | unsigned int data_shndx, Address r_offset, Symbol_table* symtab) |
| 701 | { |
| 702 | return (size == 64 |
| 703 | && !this->branch_info_.empty() |
| 704 | && this->branch_info_.back().mark_pltcall(ppc_object, data_shndx, |
| 705 | r_offset, this, symtab)); |
| 706 | } |
| 707 | |
| 708 | // Say the given location, that of a nop in a function prologue with |
| 709 | // an R_PPC64_TOCSAVE reloc, will be used to save r2. |
| 710 | // R_PPC64_TOCSAVE relocs on nops following calls point at this nop. |
| 711 | void |
| 712 | add_tocsave(Powerpc_relobj<size, big_endian>* ppc_object, |
| 713 | unsigned int shndx, Address offset) |
| 714 | { |
| 715 | Symbol_location loc; |
| 716 | loc.object = ppc_object; |
| 717 | loc.shndx = shndx; |
| 718 | loc.offset = offset; |
| 719 | this->tocsave_loc_.insert(loc); |
| 720 | } |
| 721 | |
| 722 | // Accessor |
| 723 | const Tocsave_loc |
| 724 | tocsave_loc() const |
| 725 | { |
| 726 | return this->tocsave_loc_; |
| 727 | } |
| 728 | |
| 729 | void |
| 730 | do_define_standard_symbols(Symbol_table*, Layout*); |
| 731 | |
| 732 | // Finalize the sections. |
| 733 | void |
| 734 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
| 735 | |
| 736 | // Return the value to use for a dynamic which requires special |
| 737 | // treatment. |
| 738 | uint64_t |
| 739 | do_dynsym_value(const Symbol*) const; |
| 740 | |
| 741 | // Return the PLT address to use for a local symbol. |
| 742 | uint64_t |
| 743 | do_plt_address_for_local(const Relobj*, unsigned int) const; |
| 744 | |
| 745 | // Return the PLT address to use for a global symbol. |
| 746 | uint64_t |
| 747 | do_plt_address_for_global(const Symbol*) const; |
| 748 | |
| 749 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 750 | // for a local tls symbol specified by OBJECT, SYMNDX. |
| 751 | int64_t |
| 752 | do_tls_offset_for_local(const Relobj* object, |
| 753 | unsigned int symndx, |
| 754 | unsigned int got_indx) const; |
| 755 | |
| 756 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 757 | // for global tls symbol GSYM. |
| 758 | int64_t |
| 759 | do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const; |
| 760 | |
| 761 | void |
| 762 | do_function_location(Symbol_location*) const; |
| 763 | |
| 764 | bool |
| 765 | do_can_check_for_function_pointers() const |
| 766 | { return true; } |
| 767 | |
| 768 | // Adjust -fsplit-stack code which calls non-split-stack code. |
| 769 | void |
| 770 | do_calls_non_split(Relobj* object, unsigned int shndx, |
| 771 | section_offset_type fnoffset, section_size_type fnsize, |
| 772 | const unsigned char* prelocs, size_t reloc_count, |
| 773 | unsigned char* view, section_size_type view_size, |
| 774 | std::string* from, std::string* to) const; |
| 775 | |
| 776 | // Relocate a section. |
| 777 | void |
| 778 | relocate_section(const Relocate_info<size, big_endian>*, |
| 779 | unsigned int sh_type, |
| 780 | const unsigned char* prelocs, |
| 781 | size_t reloc_count, |
| 782 | Output_section* output_section, |
| 783 | bool needs_special_offset_handling, |
| 784 | unsigned char* view, |
| 785 | Address view_address, |
| 786 | section_size_type view_size, |
| 787 | const Reloc_symbol_changes*); |
| 788 | |
| 789 | // Scan the relocs during a relocatable link. |
| 790 | void |
| 791 | scan_relocatable_relocs(Symbol_table* symtab, |
| 792 | Layout* layout, |
| 793 | Sized_relobj_file<size, big_endian>* object, |
| 794 | unsigned int data_shndx, |
| 795 | unsigned int sh_type, |
| 796 | const unsigned char* prelocs, |
| 797 | size_t reloc_count, |
| 798 | Output_section* output_section, |
| 799 | bool needs_special_offset_handling, |
| 800 | size_t local_symbol_count, |
| 801 | const unsigned char* plocal_symbols, |
| 802 | Relocatable_relocs*); |
| 803 | |
| 804 | // Scan the relocs for --emit-relocs. |
| 805 | void |
| 806 | emit_relocs_scan(Symbol_table* symtab, |
| 807 | Layout* layout, |
| 808 | Sized_relobj_file<size, big_endian>* object, |
| 809 | unsigned int data_shndx, |
| 810 | unsigned int sh_type, |
| 811 | const unsigned char* prelocs, |
| 812 | size_t reloc_count, |
| 813 | Output_section* output_section, |
| 814 | bool needs_special_offset_handling, |
| 815 | size_t local_symbol_count, |
| 816 | const unsigned char* plocal_syms, |
| 817 | Relocatable_relocs* rr); |
| 818 | |
| 819 | // Emit relocations for a section. |
| 820 | void |
| 821 | relocate_relocs(const Relocate_info<size, big_endian>*, |
| 822 | unsigned int sh_type, |
| 823 | const unsigned char* prelocs, |
| 824 | size_t reloc_count, |
| 825 | Output_section* output_section, |
| 826 | typename elfcpp::Elf_types<size>::Elf_Off |
| 827 | offset_in_output_section, |
| 828 | unsigned char*, |
| 829 | Address view_address, |
| 830 | section_size_type, |
| 831 | unsigned char* reloc_view, |
| 832 | section_size_type reloc_view_size); |
| 833 | |
| 834 | // Return whether SYM is defined by the ABI. |
| 835 | bool |
| 836 | do_is_defined_by_abi(const Symbol* sym) const |
| 837 | { |
| 838 | return strcmp(sym->name(), "__tls_get_addr") == 0; |
| 839 | } |
| 840 | |
| 841 | // Return the size of the GOT section. |
| 842 | section_size_type |
| 843 | got_size() const |
| 844 | { |
| 845 | gold_assert(this->got_ != NULL); |
| 846 | return this->got_->data_size(); |
| 847 | } |
| 848 | |
| 849 | // Get the PLT section. |
| 850 | const Output_data_plt_powerpc<size, big_endian>* |
| 851 | plt_section() const |
| 852 | { |
| 853 | gold_assert(this->plt_ != NULL); |
| 854 | return this->plt_; |
| 855 | } |
| 856 | |
| 857 | // Get the IPLT section. |
| 858 | const Output_data_plt_powerpc<size, big_endian>* |
| 859 | iplt_section() const |
| 860 | { |
| 861 | gold_assert(this->iplt_ != NULL); |
| 862 | return this->iplt_; |
| 863 | } |
| 864 | |
| 865 | // Get the LPLT section. |
| 866 | const Output_data_plt_powerpc<size, big_endian>* |
| 867 | lplt_section() const |
| 868 | { |
| 869 | return this->lplt_; |
| 870 | } |
| 871 | |
| 872 | // Return the plt offset and section for the given global sym. |
| 873 | Address |
| 874 | plt_off(const Symbol* gsym, |
| 875 | const Output_data_plt_powerpc<size, big_endian>** sec) const |
| 876 | { |
| 877 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 878 | && gsym->can_use_relative_reloc(false)) |
| 879 | *sec = this->iplt_section(); |
| 880 | else |
| 881 | *sec = this->plt_section(); |
| 882 | return gsym->plt_offset(); |
| 883 | } |
| 884 | |
| 885 | // Return the plt offset and section for the given local sym. |
| 886 | Address |
| 887 | plt_off(const Sized_relobj_file<size, big_endian>* relobj, |
| 888 | unsigned int local_sym_index, |
| 889 | const Output_data_plt_powerpc<size, big_endian>** sec) const |
| 890 | { |
| 891 | const Symbol_value<size>* lsym = relobj->local_symbol(local_sym_index); |
| 892 | if (lsym->is_ifunc_symbol()) |
| 893 | *sec = this->iplt_section(); |
| 894 | else |
| 895 | *sec = this->lplt_section(); |
| 896 | return relobj->local_plt_offset(local_sym_index); |
| 897 | } |
| 898 | |
| 899 | // Get the .glink section. |
| 900 | const Output_data_glink<size, big_endian>* |
| 901 | glink_section() const |
| 902 | { |
| 903 | gold_assert(this->glink_ != NULL); |
| 904 | return this->glink_; |
| 905 | } |
| 906 | |
| 907 | Output_data_glink<size, big_endian>* |
| 908 | glink_section() |
| 909 | { |
| 910 | gold_assert(this->glink_ != NULL); |
| 911 | return this->glink_; |
| 912 | } |
| 913 | |
| 914 | bool has_glink() const |
| 915 | { return this->glink_ != NULL; } |
| 916 | |
| 917 | // Get the GOT section. |
| 918 | const Output_data_got_powerpc<size, big_endian>* |
| 919 | got_section() const |
| 920 | { |
| 921 | gold_assert(this->got_ != NULL); |
| 922 | return this->got_; |
| 923 | } |
| 924 | |
| 925 | // Get the GOT section, creating it if necessary. |
| 926 | Output_data_got_powerpc<size, big_endian>* |
| 927 | got_section(Symbol_table*, Layout*); |
| 928 | |
| 929 | Object* |
| 930 | do_make_elf_object(const std::string&, Input_file*, off_t, |
| 931 | const elfcpp::Ehdr<size, big_endian>&); |
| 932 | |
| 933 | // Return the number of entries in the GOT. |
| 934 | unsigned int |
| 935 | got_entry_count() const |
| 936 | { |
| 937 | if (this->got_ == NULL) |
| 938 | return 0; |
| 939 | return this->got_size() / (size / 8); |
| 940 | } |
| 941 | |
| 942 | // Return the number of entries in the PLT. |
| 943 | unsigned int |
| 944 | plt_entry_count() const; |
| 945 | |
| 946 | // Return the offset of the first non-reserved PLT entry. |
| 947 | unsigned int |
| 948 | first_plt_entry_offset() const |
| 949 | { |
| 950 | if (size == 32) |
| 951 | return 0; |
| 952 | if (this->abiversion() >= 2) |
| 953 | return 16; |
| 954 | return 24; |
| 955 | } |
| 956 | |
| 957 | // Return the size of each PLT entry. |
| 958 | unsigned int |
| 959 | plt_entry_size() const |
| 960 | { |
| 961 | if (size == 32) |
| 962 | return 4; |
| 963 | if (this->abiversion() >= 2) |
| 964 | return 8; |
| 965 | return 24; |
| 966 | } |
| 967 | |
| 968 | Output_data_save_res<size, big_endian>* |
| 969 | savres_section() const |
| 970 | { |
| 971 | return this->savres_section_; |
| 972 | } |
| 973 | |
| 974 | // Add any special sections for this symbol to the gc work list. |
| 975 | // For powerpc64, this adds the code section of a function |
| 976 | // descriptor. |
| 977 | void |
| 978 | do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const; |
| 979 | |
| 980 | // Handle target specific gc actions when adding a gc reference from |
| 981 | // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX |
| 982 | // and DST_OFF. For powerpc64, this adds a referenc to the code |
| 983 | // section of a function descriptor. |
| 984 | void |
| 985 | do_gc_add_reference(Symbol_table* symtab, |
| 986 | Relobj* src_obj, |
| 987 | unsigned int src_shndx, |
| 988 | Relobj* dst_obj, |
| 989 | unsigned int dst_shndx, |
| 990 | Address dst_off) const; |
| 991 | |
| 992 | typedef std::vector<Stub_table<size, big_endian>*> Stub_tables; |
| 993 | const Stub_tables& |
| 994 | stub_tables() const |
| 995 | { return this->stub_tables_; } |
| 996 | |
| 997 | const Output_data_brlt_powerpc<size, big_endian>* |
| 998 | brlt_section() const |
| 999 | { return this->brlt_section_; } |
| 1000 | |
| 1001 | void |
| 1002 | add_branch_lookup_table(Address to) |
| 1003 | { |
| 1004 | unsigned int off = this->branch_lookup_table_.size() * (size / 8); |
| 1005 | this->branch_lookup_table_.insert(std::make_pair(to, off)); |
| 1006 | } |
| 1007 | |
| 1008 | Address |
| 1009 | find_branch_lookup_table(Address to) |
| 1010 | { |
| 1011 | typename Branch_lookup_table::const_iterator p |
| 1012 | = this->branch_lookup_table_.find(to); |
| 1013 | return p == this->branch_lookup_table_.end() ? invalid_address : p->second; |
| 1014 | } |
| 1015 | |
| 1016 | void |
| 1017 | write_branch_lookup_table(unsigned char *oview) |
| 1018 | { |
| 1019 | for (typename Branch_lookup_table::const_iterator p |
| 1020 | = this->branch_lookup_table_.begin(); |
| 1021 | p != this->branch_lookup_table_.end(); |
| 1022 | ++p) |
| 1023 | { |
| 1024 | elfcpp::Swap<size, big_endian>::writeval(oview + p->second, p->first); |
| 1025 | } |
| 1026 | } |
| 1027 | |
| 1028 | // Wrapper used after relax to define a local symbol in output data, |
| 1029 | // from the end if value < 0. |
| 1030 | void |
| 1031 | define_local(Symbol_table* symtab, const char* name, |
| 1032 | Output_data* od, Address value, unsigned int symsize) |
| 1033 | { |
| 1034 | Symbol* sym |
| 1035 | = symtab->define_in_output_data(name, NULL, Symbol_table::PREDEFINED, |
| 1036 | od, value, symsize, elfcpp::STT_NOTYPE, |
| 1037 | elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN, 0, |
| 1038 | static_cast<Signed_address>(value) < 0, |
| 1039 | false); |
| 1040 | // We are creating this symbol late, so need to fix up things |
| 1041 | // done early in Layout::finalize. |
| 1042 | sym->set_dynsym_index(-1U); |
| 1043 | } |
| 1044 | |
| 1045 | bool |
| 1046 | plt_thread_safe() const |
| 1047 | { return this->plt_thread_safe_; } |
| 1048 | |
| 1049 | bool |
| 1050 | plt_localentry0() const |
| 1051 | { return this->plt_localentry0_; } |
| 1052 | |
| 1053 | void |
| 1054 | set_has_localentry0() |
| 1055 | { |
| 1056 | this->has_localentry0_ = true; |
| 1057 | } |
| 1058 | |
| 1059 | bool |
| 1060 | is_elfv2_localentry0(const Symbol* gsym) const |
| 1061 | { |
| 1062 | return (size == 64 |
| 1063 | && this->abiversion() >= 2 |
| 1064 | && this->plt_localentry0() |
| 1065 | && gsym->type() == elfcpp::STT_FUNC |
| 1066 | && gsym->is_defined() |
| 1067 | && gsym->nonvis() >> 3 == 0 |
| 1068 | && !gsym->non_zero_localentry()); |
| 1069 | } |
| 1070 | |
| 1071 | bool |
| 1072 | is_elfv2_localentry0(const Sized_relobj_file<size, big_endian>* object, |
| 1073 | unsigned int r_sym) const |
| 1074 | { |
| 1075 | const Powerpc_relobj<size, big_endian>* ppc_object |
| 1076 | = static_cast<const Powerpc_relobj<size, big_endian>*>(object); |
| 1077 | |
| 1078 | if (size == 64 |
| 1079 | && this->abiversion() >= 2 |
| 1080 | && this->plt_localentry0() |
| 1081 | && ppc_object->st_other(r_sym) >> 5 == 0) |
| 1082 | { |
| 1083 | const Symbol_value<size>* psymval = object->local_symbol(r_sym); |
| 1084 | bool is_ordinary; |
| 1085 | if (!psymval->is_ifunc_symbol() |
| 1086 | && psymval->input_shndx(&is_ordinary) != elfcpp::SHN_UNDEF |
| 1087 | && is_ordinary) |
| 1088 | return true; |
| 1089 | } |
| 1090 | return false; |
| 1091 | } |
| 1092 | |
| 1093 | // Remember any symbols seen with non-zero localentry, even those |
| 1094 | // not providing a definition |
| 1095 | bool |
| 1096 | resolve(Symbol* to, const elfcpp::Sym<size, big_endian>& sym, Object*, |
| 1097 | const char*) |
| 1098 | { |
| 1099 | if (size == 64) |
| 1100 | { |
| 1101 | unsigned char st_other = sym.get_st_other(); |
| 1102 | if ((st_other & elfcpp::STO_PPC64_LOCAL_MASK) != 0) |
| 1103 | to->set_non_zero_localentry(); |
| 1104 | } |
| 1105 | // We haven't resolved anything, continue normal processing. |
| 1106 | return false; |
| 1107 | } |
| 1108 | |
| 1109 | int |
| 1110 | abiversion() const |
| 1111 | { return this->processor_specific_flags() & elfcpp::EF_PPC64_ABI; } |
| 1112 | |
| 1113 | void |
| 1114 | set_abiversion(int ver) |
| 1115 | { |
| 1116 | elfcpp::Elf_Word flags = this->processor_specific_flags(); |
| 1117 | flags &= ~elfcpp::EF_PPC64_ABI; |
| 1118 | flags |= ver & elfcpp::EF_PPC64_ABI; |
| 1119 | this->set_processor_specific_flags(flags); |
| 1120 | } |
| 1121 | |
| 1122 | Symbol* |
| 1123 | tls_get_addr_opt() const |
| 1124 | { return this->tls_get_addr_opt_; } |
| 1125 | |
| 1126 | Symbol* |
| 1127 | tls_get_addr() const |
| 1128 | { return this->tls_get_addr_; } |
| 1129 | |
| 1130 | // If optimizing __tls_get_addr calls, whether this is the |
| 1131 | // "__tls_get_addr" symbol. |
| 1132 | bool |
| 1133 | is_tls_get_addr_opt(const Symbol* gsym) const |
| 1134 | { |
| 1135 | return this->tls_get_addr_opt_ && (gsym == this->tls_get_addr_ |
| 1136 | || gsym == this->tls_get_addr_opt_); |
| 1137 | } |
| 1138 | |
| 1139 | bool |
| 1140 | replace_tls_get_addr(const Symbol* gsym) const |
| 1141 | { return this->tls_get_addr_opt_ && gsym == this->tls_get_addr_; } |
| 1142 | |
| 1143 | void |
| 1144 | set_has_tls_get_addr_opt() |
| 1145 | { this->has_tls_get_addr_opt_ = true; } |
| 1146 | |
| 1147 | // Offset to toc save stack slot |
| 1148 | int |
| 1149 | stk_toc() const |
| 1150 | { return this->abiversion() < 2 ? 40 : 24; } |
| 1151 | |
| 1152 | // Offset to linker save stack slot. ELFv2 doesn't have a linker word, |
| 1153 | // so use the CR save slot. Used only by __tls_get_addr call stub, |
| 1154 | // relying on __tls_get_addr not saving CR itself. |
| 1155 | int |
| 1156 | stk_linker() const |
| 1157 | { return this->abiversion() < 2 ? 32 : 8; } |
| 1158 | |
| 1159 | private: |
| 1160 | |
| 1161 | class Track_tls |
| 1162 | { |
| 1163 | public: |
| 1164 | enum Tls_get_addr |
| 1165 | { |
| 1166 | NOT_EXPECTED = 0, |
| 1167 | EXPECTED = 1, |
| 1168 | SKIP = 2, |
| 1169 | NORMAL = 3 |
| 1170 | }; |
| 1171 | |
| 1172 | Track_tls() |
| 1173 | : tls_get_addr_state_(NOT_EXPECTED), |
| 1174 | relinfo_(NULL), relnum_(0), r_offset_(0) |
| 1175 | { } |
| 1176 | |
| 1177 | ~Track_tls() |
| 1178 | { |
| 1179 | if (this->tls_get_addr_state_ != NOT_EXPECTED) |
| 1180 | this->missing(); |
| 1181 | } |
| 1182 | |
| 1183 | void |
| 1184 | missing(void) |
| 1185 | { |
| 1186 | if (this->relinfo_ != NULL) |
| 1187 | gold_error_at_location(this->relinfo_, this->relnum_, this->r_offset_, |
| 1188 | _("missing expected __tls_get_addr call")); |
| 1189 | } |
| 1190 | |
| 1191 | void |
| 1192 | expect_tls_get_addr_call( |
| 1193 | const Relocate_info<size, big_endian>* relinfo, |
| 1194 | size_t relnum, |
| 1195 | Address r_offset) |
| 1196 | { |
| 1197 | this->tls_get_addr_state_ = EXPECTED; |
| 1198 | this->relinfo_ = relinfo; |
| 1199 | this->relnum_ = relnum; |
| 1200 | this->r_offset_ = r_offset; |
| 1201 | } |
| 1202 | |
| 1203 | void |
| 1204 | expect_tls_get_addr_call() |
| 1205 | { this->tls_get_addr_state_ = EXPECTED; } |
| 1206 | |
| 1207 | void |
| 1208 | skip_next_tls_get_addr_call() |
| 1209 | {this->tls_get_addr_state_ = SKIP; } |
| 1210 | |
| 1211 | Tls_get_addr |
| 1212 | maybe_skip_tls_get_addr_call(Target_powerpc<size, big_endian>* target, |
| 1213 | unsigned int r_type, const Symbol* gsym) |
| 1214 | { |
| 1215 | bool is_tls_call = ((r_type == elfcpp::R_POWERPC_REL24 |
| 1216 | || r_type == elfcpp::R_PPC_PLTREL24 |
| 1217 | || is_plt16_reloc<size>(r_type) |
| 1218 | || r_type == elfcpp::R_POWERPC_PLTSEQ |
| 1219 | || r_type == elfcpp::R_POWERPC_PLTCALL) |
| 1220 | && gsym != NULL |
| 1221 | && (gsym == target->tls_get_addr() |
| 1222 | || gsym == target->tls_get_addr_opt())); |
| 1223 | Tls_get_addr last_tls = this->tls_get_addr_state_; |
| 1224 | this->tls_get_addr_state_ = NOT_EXPECTED; |
| 1225 | if (is_tls_call && last_tls != EXPECTED) |
| 1226 | return last_tls; |
| 1227 | else if (!is_tls_call && last_tls != NOT_EXPECTED) |
| 1228 | { |
| 1229 | this->missing(); |
| 1230 | return EXPECTED; |
| 1231 | } |
| 1232 | return NORMAL; |
| 1233 | } |
| 1234 | |
| 1235 | private: |
| 1236 | // What we're up to regarding calls to __tls_get_addr. |
| 1237 | // On powerpc, the branch and link insn making a call to |
| 1238 | // __tls_get_addr is marked with a relocation, R_PPC64_TLSGD, |
| 1239 | // R_PPC64_TLSLD, R_PPC_TLSGD or R_PPC_TLSLD, in addition to the |
| 1240 | // usual R_POWERPC_REL24 or R_PPC_PLTREL25 relocation on a call. |
| 1241 | // The marker relocation always comes first, and has the same |
| 1242 | // symbol as the reloc on the insn setting up the __tls_get_addr |
| 1243 | // argument. This ties the arg setup insn with the call insn, |
| 1244 | // allowing ld to safely optimize away the call. We check that |
| 1245 | // every call to __tls_get_addr has a marker relocation, and that |
| 1246 | // every marker relocation is on a call to __tls_get_addr. |
| 1247 | Tls_get_addr tls_get_addr_state_; |
| 1248 | // Info about the last reloc for error message. |
| 1249 | const Relocate_info<size, big_endian>* relinfo_; |
| 1250 | size_t relnum_; |
| 1251 | Address r_offset_; |
| 1252 | }; |
| 1253 | |
| 1254 | // The class which scans relocations. |
| 1255 | class Scan : protected Track_tls |
| 1256 | { |
| 1257 | public: |
| 1258 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1259 | |
| 1260 | Scan() |
| 1261 | : Track_tls(), issued_non_pic_error_(false) |
| 1262 | { } |
| 1263 | |
| 1264 | static inline int |
| 1265 | get_reference_flags(unsigned int r_type, const Target_powerpc* target); |
| 1266 | |
| 1267 | inline void |
| 1268 | local(Symbol_table* symtab, Layout* layout, Target_powerpc* target, |
| 1269 | Sized_relobj_file<size, big_endian>* object, |
| 1270 | unsigned int data_shndx, |
| 1271 | Output_section* output_section, |
| 1272 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 1273 | const elfcpp::Sym<size, big_endian>& lsym, |
| 1274 | bool is_discarded); |
| 1275 | |
| 1276 | inline void |
| 1277 | global(Symbol_table* symtab, Layout* layout, Target_powerpc* target, |
| 1278 | Sized_relobj_file<size, big_endian>* object, |
| 1279 | unsigned int data_shndx, |
| 1280 | Output_section* output_section, |
| 1281 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 1282 | Symbol* gsym); |
| 1283 | |
| 1284 | inline bool |
| 1285 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 1286 | Target_powerpc* , |
| 1287 | Sized_relobj_file<size, big_endian>* relobj, |
| 1288 | unsigned int , |
| 1289 | Output_section* , |
| 1290 | const elfcpp::Rela<size, big_endian>& , |
| 1291 | unsigned int r_type, |
| 1292 | const elfcpp::Sym<size, big_endian>&) |
| 1293 | { |
| 1294 | // PowerPC64 .opd is not folded, so any identical function text |
| 1295 | // may be folded and we'll still keep function addresses distinct. |
| 1296 | // That means no reloc is of concern here. |
| 1297 | if (size == 64) |
| 1298 | { |
| 1299 | Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 1300 | <Powerpc_relobj<size, big_endian>*>(relobj); |
| 1301 | if (ppcobj->abiversion() == 1) |
| 1302 | return false; |
| 1303 | } |
| 1304 | // For 32-bit and ELFv2, conservatively assume anything but calls to |
| 1305 | // function code might be taking the address of the function. |
| 1306 | return !is_branch_reloc(r_type); |
| 1307 | } |
| 1308 | |
| 1309 | inline bool |
| 1310 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 1311 | Target_powerpc* , |
| 1312 | Sized_relobj_file<size, big_endian>* relobj, |
| 1313 | unsigned int , |
| 1314 | Output_section* , |
| 1315 | const elfcpp::Rela<size, big_endian>& , |
| 1316 | unsigned int r_type, |
| 1317 | Symbol*) |
| 1318 | { |
| 1319 | // As above. |
| 1320 | if (size == 64) |
| 1321 | { |
| 1322 | Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 1323 | <Powerpc_relobj<size, big_endian>*>(relobj); |
| 1324 | if (ppcobj->abiversion() == 1) |
| 1325 | return false; |
| 1326 | } |
| 1327 | return !is_branch_reloc(r_type); |
| 1328 | } |
| 1329 | |
| 1330 | static bool |
| 1331 | reloc_needs_plt_for_ifunc(Target_powerpc<size, big_endian>* target, |
| 1332 | Sized_relobj_file<size, big_endian>* object, |
| 1333 | unsigned int r_type, bool report_err); |
| 1334 | |
| 1335 | private: |
| 1336 | static void |
| 1337 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, |
| 1338 | unsigned int r_type); |
| 1339 | |
| 1340 | static void |
| 1341 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, |
| 1342 | unsigned int r_type, Symbol*); |
| 1343 | |
| 1344 | static void |
| 1345 | generate_tls_call(Symbol_table* symtab, Layout* layout, |
| 1346 | Target_powerpc* target); |
| 1347 | |
| 1348 | void |
| 1349 | check_non_pic(Relobj*, unsigned int r_type); |
| 1350 | |
| 1351 | // Whether we have issued an error about a non-PIC compilation. |
| 1352 | bool issued_non_pic_error_; |
| 1353 | }; |
| 1354 | |
| 1355 | bool |
| 1356 | symval_for_branch(const Symbol_table* symtab, |
| 1357 | const Sized_symbol<size>* gsym, |
| 1358 | Powerpc_relobj<size, big_endian>* object, |
| 1359 | Address *value, unsigned int *dest_shndx); |
| 1360 | |
| 1361 | // The class which implements relocation. |
| 1362 | class Relocate : protected Track_tls |
| 1363 | { |
| 1364 | public: |
| 1365 | // Use 'at' branch hints when true, 'y' when false. |
| 1366 | // FIXME maybe: set this with an option. |
| 1367 | static const bool is_isa_v2 = true; |
| 1368 | |
| 1369 | Relocate() |
| 1370 | : Track_tls() |
| 1371 | { } |
| 1372 | |
| 1373 | // Do a relocation. Return false if the caller should not issue |
| 1374 | // any warnings about this relocation. |
| 1375 | inline bool |
| 1376 | relocate(const Relocate_info<size, big_endian>*, unsigned int, |
| 1377 | Target_powerpc*, Output_section*, size_t, const unsigned char*, |
| 1378 | const Sized_symbol<size>*, const Symbol_value<size>*, |
| 1379 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
| 1380 | section_size_type); |
| 1381 | }; |
| 1382 | |
| 1383 | class Relocate_comdat_behavior |
| 1384 | { |
| 1385 | public: |
| 1386 | // Decide what the linker should do for relocations that refer to |
| 1387 | // discarded comdat sections. |
| 1388 | inline Comdat_behavior |
| 1389 | get(const char* name) |
| 1390 | { |
| 1391 | gold::Default_comdat_behavior default_behavior; |
| 1392 | Comdat_behavior ret = default_behavior.get(name); |
| 1393 | if (ret == CB_ERROR) |
| 1394 | { |
| 1395 | if (size == 32 |
| 1396 | && (strcmp(name, ".fixup") == 0 |
| 1397 | || strcmp(name, ".got2") == 0)) |
| 1398 | ret = CB_IGNORE; |
| 1399 | if (size == 64 |
| 1400 | && (strcmp(name, ".opd") == 0 |
| 1401 | || strcmp(name, ".toc") == 0 |
| 1402 | || strcmp(name, ".toc1") == 0)) |
| 1403 | ret = CB_IGNORE; |
| 1404 | } |
| 1405 | return ret; |
| 1406 | } |
| 1407 | }; |
| 1408 | |
| 1409 | // Optimize the TLS relocation type based on what we know about the |
| 1410 | // symbol. IS_FINAL is true if the final address of this symbol is |
| 1411 | // known at link time. |
| 1412 | |
| 1413 | tls::Tls_optimization |
| 1414 | optimize_tls_gd(bool is_final) |
| 1415 | { |
| 1416 | // If we are generating a shared library, then we can't do anything |
| 1417 | // in the linker. |
| 1418 | if (parameters->options().shared() |
| 1419 | || !parameters->options().tls_optimize()) |
| 1420 | return tls::TLSOPT_NONE; |
| 1421 | |
| 1422 | if (!is_final) |
| 1423 | return tls::TLSOPT_TO_IE; |
| 1424 | return tls::TLSOPT_TO_LE; |
| 1425 | } |
| 1426 | |
| 1427 | tls::Tls_optimization |
| 1428 | optimize_tls_ld() |
| 1429 | { |
| 1430 | if (parameters->options().shared() |
| 1431 | || !parameters->options().tls_optimize()) |
| 1432 | return tls::TLSOPT_NONE; |
| 1433 | |
| 1434 | return tls::TLSOPT_TO_LE; |
| 1435 | } |
| 1436 | |
| 1437 | tls::Tls_optimization |
| 1438 | optimize_tls_ie(bool is_final) |
| 1439 | { |
| 1440 | if (!is_final |
| 1441 | || parameters->options().shared() |
| 1442 | || !parameters->options().tls_optimize()) |
| 1443 | return tls::TLSOPT_NONE; |
| 1444 | |
| 1445 | return tls::TLSOPT_TO_LE; |
| 1446 | } |
| 1447 | |
| 1448 | // Create glink. |
| 1449 | void |
| 1450 | make_glink_section(Layout*); |
| 1451 | |
| 1452 | // Create the PLT section. |
| 1453 | void |
| 1454 | make_plt_section(Symbol_table*, Layout*); |
| 1455 | |
| 1456 | void |
| 1457 | make_iplt_section(Symbol_table*, Layout*); |
| 1458 | |
| 1459 | void |
| 1460 | make_lplt_section(Layout*); |
| 1461 | |
| 1462 | void |
| 1463 | make_brlt_section(Layout*); |
| 1464 | |
| 1465 | // Create a PLT entry for a global symbol. |
| 1466 | void |
| 1467 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
| 1468 | |
| 1469 | // Create a PLT entry for a local IFUNC symbol. |
| 1470 | void |
| 1471 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, |
| 1472 | Sized_relobj_file<size, big_endian>*, |
| 1473 | unsigned int); |
| 1474 | |
| 1475 | // Create a PLT entry for a local non-IFUNC symbol. |
| 1476 | void |
| 1477 | make_local_plt_entry(Layout*, |
| 1478 | Sized_relobj_file<size, big_endian>*, |
| 1479 | unsigned int); |
| 1480 | |
| 1481 | |
| 1482 | // Create a GOT entry for local dynamic __tls_get_addr. |
| 1483 | unsigned int |
| 1484 | tlsld_got_offset(Symbol_table* symtab, Layout* layout, |
| 1485 | Sized_relobj_file<size, big_endian>* object); |
| 1486 | |
| 1487 | unsigned int |
| 1488 | tlsld_got_offset() const |
| 1489 | { |
| 1490 | return this->tlsld_got_offset_; |
| 1491 | } |
| 1492 | |
| 1493 | // Get the dynamic reloc section, creating it if necessary. |
| 1494 | Reloc_section* |
| 1495 | rela_dyn_section(Layout*); |
| 1496 | |
| 1497 | // Similarly, but for ifunc symbols get the one for ifunc. |
| 1498 | Reloc_section* |
| 1499 | rela_dyn_section(Symbol_table*, Layout*, bool for_ifunc); |
| 1500 | |
| 1501 | // Copy a relocation against a global symbol. |
| 1502 | void |
| 1503 | copy_reloc(Symbol_table* symtab, Layout* layout, |
| 1504 | Sized_relobj_file<size, big_endian>* object, |
| 1505 | unsigned int shndx, Output_section* output_section, |
| 1506 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) |
| 1507 | { |
| 1508 | unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info()); |
| 1509 | this->copy_relocs_.copy_reloc(symtab, layout, |
| 1510 | symtab->get_sized_symbol<size>(sym), |
| 1511 | object, shndx, output_section, |
| 1512 | r_type, reloc.get_r_offset(), |
| 1513 | reloc.get_r_addend(), |
| 1514 | this->rela_dyn_section(layout)); |
| 1515 | } |
| 1516 | |
| 1517 | // Look over all the input sections, deciding where to place stubs. |
| 1518 | void |
| 1519 | group_sections(Layout*, const Task*, bool); |
| 1520 | |
| 1521 | // Sort output sections by address. |
| 1522 | struct Sort_sections |
| 1523 | { |
| 1524 | bool |
| 1525 | operator()(const Output_section* sec1, const Output_section* sec2) |
| 1526 | { return sec1->address() < sec2->address(); } |
| 1527 | }; |
| 1528 | |
| 1529 | class Branch_info |
| 1530 | { |
| 1531 | public: |
| 1532 | Branch_info(Powerpc_relobj<size, big_endian>* ppc_object, |
| 1533 | unsigned int data_shndx, |
| 1534 | Address r_offset, |
| 1535 | unsigned int r_type, |
| 1536 | unsigned int r_sym, |
| 1537 | Address addend) |
| 1538 | : object_(ppc_object), shndx_(data_shndx), offset_(r_offset), |
| 1539 | r_type_(r_type), tocsave_ (0), r_sym_(r_sym), addend_(addend) |
| 1540 | { } |
| 1541 | |
| 1542 | ~Branch_info() |
| 1543 | { } |
| 1544 | |
| 1545 | // Return whether this branch is going via a plt call stub, and if |
| 1546 | // so, mark it as having an R_PPC64_TOCSAVE. |
| 1547 | bool |
| 1548 | mark_pltcall(Powerpc_relobj<size, big_endian>* ppc_object, |
| 1549 | unsigned int shndx, Address offset, |
| 1550 | Target_powerpc* target, Symbol_table* symtab); |
| 1551 | |
| 1552 | // If this branch needs a plt call stub, or a long branch stub, make one. |
| 1553 | bool |
| 1554 | make_stub(Stub_table<size, big_endian>*, |
| 1555 | Stub_table<size, big_endian>*, |
| 1556 | Symbol_table*) const; |
| 1557 | |
| 1558 | private: |
| 1559 | // The branch location.. |
| 1560 | Powerpc_relobj<size, big_endian>* object_; |
| 1561 | unsigned int shndx_; |
| 1562 | Address offset_; |
| 1563 | // ..and the branch type and destination. |
| 1564 | unsigned int r_type_ : 31; |
| 1565 | unsigned int tocsave_ : 1; |
| 1566 | unsigned int r_sym_; |
| 1567 | Address addend_; |
| 1568 | }; |
| 1569 | |
| 1570 | // Information about this specific target which we pass to the |
| 1571 | // general Target structure. |
| 1572 | static Target::Target_info powerpc_info; |
| 1573 | |
| 1574 | // The types of GOT entries needed for this platform. |
| 1575 | // These values are exposed to the ABI in an incremental link. |
| 1576 | // Do not renumber existing values without changing the version |
| 1577 | // number of the .gnu_incremental_inputs section. |
| 1578 | enum Got_type |
| 1579 | { |
| 1580 | GOT_TYPE_STANDARD, |
| 1581 | GOT_TYPE_TLSGD, // double entry for @got@tlsgd |
| 1582 | GOT_TYPE_DTPREL, // entry for @got@dtprel |
| 1583 | GOT_TYPE_TPREL // entry for @got@tprel |
| 1584 | }; |
| 1585 | |
| 1586 | // The GOT section. |
| 1587 | Output_data_got_powerpc<size, big_endian>* got_; |
| 1588 | // The PLT section. This is a container for a table of addresses, |
| 1589 | // and their relocations. Each address in the PLT has a dynamic |
| 1590 | // relocation (R_*_JMP_SLOT) and each address will have a |
| 1591 | // corresponding entry in .glink for lazy resolution of the PLT. |
| 1592 | // ppc32 initialises the PLT to point at the .glink entry, while |
| 1593 | // ppc64 leaves this to ld.so. To make a call via the PLT, the |
| 1594 | // linker adds a stub that loads the PLT entry into ctr then |
| 1595 | // branches to ctr. There may be more than one stub for each PLT |
| 1596 | // entry. DT_JMPREL points at the first PLT dynamic relocation and |
| 1597 | // DT_PLTRELSZ gives the total size of PLT dynamic relocations. |
| 1598 | Output_data_plt_powerpc<size, big_endian>* plt_; |
| 1599 | // The IPLT section. Like plt_, this is a container for a table of |
| 1600 | // addresses and their relocations, specifically for STT_GNU_IFUNC |
| 1601 | // functions that resolve locally (STT_GNU_IFUNC functions that |
| 1602 | // don't resolve locally go in PLT). Unlike plt_, these have no |
| 1603 | // entry in .glink for lazy resolution, and the relocation section |
| 1604 | // does not have a 1-1 correspondence with IPLT addresses. In fact, |
| 1605 | // the relocation section may contain relocations against |
| 1606 | // STT_GNU_IFUNC symbols at locations outside of IPLT. The |
| 1607 | // relocation section will appear at the end of other dynamic |
| 1608 | // relocations, so that ld.so applies these relocations after other |
| 1609 | // dynamic relocations. In a static executable, the relocation |
| 1610 | // section is emitted and marked with __rela_iplt_start and |
| 1611 | // __rela_iplt_end symbols. |
| 1612 | Output_data_plt_powerpc<size, big_endian>* iplt_; |
| 1613 | // A PLT style section for local, non-ifunc symbols |
| 1614 | Output_data_plt_powerpc<size, big_endian>* lplt_; |
| 1615 | // Section holding long branch destinations. |
| 1616 | Output_data_brlt_powerpc<size, big_endian>* brlt_section_; |
| 1617 | // The .glink section. |
| 1618 | Output_data_glink<size, big_endian>* glink_; |
| 1619 | // The dynamic reloc section. |
| 1620 | Reloc_section* rela_dyn_; |
| 1621 | // Relocs saved to avoid a COPY reloc. |
| 1622 | Powerpc_copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; |
| 1623 | // Offset of the GOT entry for local dynamic __tls_get_addr calls. |
| 1624 | unsigned int tlsld_got_offset_; |
| 1625 | |
| 1626 | Stub_tables stub_tables_; |
| 1627 | typedef Unordered_map<Address, unsigned int> Branch_lookup_table; |
| 1628 | Branch_lookup_table branch_lookup_table_; |
| 1629 | |
| 1630 | typedef std::vector<Branch_info> Branches; |
| 1631 | Branches branch_info_; |
| 1632 | Tocsave_loc tocsave_loc_; |
| 1633 | |
| 1634 | bool plt_thread_safe_; |
| 1635 | bool plt_localentry0_; |
| 1636 | bool plt_localentry0_init_; |
| 1637 | bool has_localentry0_; |
| 1638 | bool has_tls_get_addr_opt_; |
| 1639 | |
| 1640 | bool relax_failed_; |
| 1641 | int relax_fail_count_; |
| 1642 | int32_t stub_group_size_; |
| 1643 | |
| 1644 | Output_data_save_res<size, big_endian> *savres_section_; |
| 1645 | |
| 1646 | // The "__tls_get_addr" symbol, if present |
| 1647 | Symbol* tls_get_addr_; |
| 1648 | // If optimizing __tls_get_addr calls, the "__tls_get_addr_opt" symbol. |
| 1649 | Symbol* tls_get_addr_opt_; |
| 1650 | }; |
| 1651 | |
| 1652 | template<> |
| 1653 | Target::Target_info Target_powerpc<32, true>::powerpc_info = |
| 1654 | { |
| 1655 | 32, // size |
| 1656 | true, // is_big_endian |
| 1657 | elfcpp::EM_PPC, // machine_code |
| 1658 | false, // has_make_symbol |
| 1659 | false, // has_resolve |
| 1660 | false, // has_code_fill |
| 1661 | true, // is_default_stack_executable |
| 1662 | false, // can_icf_inline_merge_sections |
| 1663 | '\0', // wrap_char |
| 1664 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1665 | 0x10000000, // default_text_segment_address |
| 1666 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1667 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1668 | false, // isolate_execinstr |
| 1669 | 0, // rosegment_gap |
| 1670 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1671 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1672 | 0, // small_common_section_flags |
| 1673 | 0, // large_common_section_flags |
| 1674 | NULL, // attributes_section |
| 1675 | NULL, // attributes_vendor |
| 1676 | "_start", // entry_symbol_name |
| 1677 | 32, // hash_entry_size |
| 1678 | elfcpp::SHT_PROGBITS, // unwind_section_type |
| 1679 | }; |
| 1680 | |
| 1681 | template<> |
| 1682 | Target::Target_info Target_powerpc<32, false>::powerpc_info = |
| 1683 | { |
| 1684 | 32, // size |
| 1685 | false, // is_big_endian |
| 1686 | elfcpp::EM_PPC, // machine_code |
| 1687 | false, // has_make_symbol |
| 1688 | false, // has_resolve |
| 1689 | false, // has_code_fill |
| 1690 | true, // is_default_stack_executable |
| 1691 | false, // can_icf_inline_merge_sections |
| 1692 | '\0', // wrap_char |
| 1693 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1694 | 0x10000000, // default_text_segment_address |
| 1695 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1696 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1697 | false, // isolate_execinstr |
| 1698 | 0, // rosegment_gap |
| 1699 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1700 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1701 | 0, // small_common_section_flags |
| 1702 | 0, // large_common_section_flags |
| 1703 | NULL, // attributes_section |
| 1704 | NULL, // attributes_vendor |
| 1705 | "_start", // entry_symbol_name |
| 1706 | 32, // hash_entry_size |
| 1707 | elfcpp::SHT_PROGBITS, // unwind_section_type |
| 1708 | }; |
| 1709 | |
| 1710 | template<> |
| 1711 | Target::Target_info Target_powerpc<64, true>::powerpc_info = |
| 1712 | { |
| 1713 | 64, // size |
| 1714 | true, // is_big_endian |
| 1715 | elfcpp::EM_PPC64, // machine_code |
| 1716 | false, // has_make_symbol |
| 1717 | true, // has_resolve |
| 1718 | false, // has_code_fill |
| 1719 | false, // is_default_stack_executable |
| 1720 | false, // can_icf_inline_merge_sections |
| 1721 | '\0', // wrap_char |
| 1722 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1723 | 0x10000000, // default_text_segment_address |
| 1724 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1725 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1726 | false, // isolate_execinstr |
| 1727 | 0, // rosegment_gap |
| 1728 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1729 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1730 | 0, // small_common_section_flags |
| 1731 | 0, // large_common_section_flags |
| 1732 | NULL, // attributes_section |
| 1733 | NULL, // attributes_vendor |
| 1734 | "_start", // entry_symbol_name |
| 1735 | 32, // hash_entry_size |
| 1736 | elfcpp::SHT_PROGBITS, // unwind_section_type |
| 1737 | }; |
| 1738 | |
| 1739 | template<> |
| 1740 | Target::Target_info Target_powerpc<64, false>::powerpc_info = |
| 1741 | { |
| 1742 | 64, // size |
| 1743 | false, // is_big_endian |
| 1744 | elfcpp::EM_PPC64, // machine_code |
| 1745 | false, // has_make_symbol |
| 1746 | true, // has_resolve |
| 1747 | false, // has_code_fill |
| 1748 | false, // is_default_stack_executable |
| 1749 | false, // can_icf_inline_merge_sections |
| 1750 | '\0', // wrap_char |
| 1751 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1752 | 0x10000000, // default_text_segment_address |
| 1753 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1754 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1755 | false, // isolate_execinstr |
| 1756 | 0, // rosegment_gap |
| 1757 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1758 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1759 | 0, // small_common_section_flags |
| 1760 | 0, // large_common_section_flags |
| 1761 | NULL, // attributes_section |
| 1762 | NULL, // attributes_vendor |
| 1763 | "_start", // entry_symbol_name |
| 1764 | 32, // hash_entry_size |
| 1765 | elfcpp::SHT_PROGBITS, // unwind_section_type |
| 1766 | }; |
| 1767 | |
| 1768 | inline bool |
| 1769 | is_branch_reloc(unsigned int r_type) |
| 1770 | { |
| 1771 | return (r_type == elfcpp::R_POWERPC_REL24 |
| 1772 | || r_type == elfcpp::R_PPC_PLTREL24 |
| 1773 | || r_type == elfcpp::R_PPC_LOCAL24PC |
| 1774 | || r_type == elfcpp::R_POWERPC_REL14 |
| 1775 | || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN |
| 1776 | || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN |
| 1777 | || r_type == elfcpp::R_POWERPC_ADDR24 |
| 1778 | || r_type == elfcpp::R_POWERPC_ADDR14 |
| 1779 | || r_type == elfcpp::R_POWERPC_ADDR14_BRTAKEN |
| 1780 | || r_type == elfcpp::R_POWERPC_ADDR14_BRNTAKEN); |
| 1781 | } |
| 1782 | |
| 1783 | // Reloc resolves to plt entry. |
| 1784 | template<int size> |
| 1785 | inline bool |
| 1786 | is_plt16_reloc(unsigned int r_type) |
| 1787 | { |
| 1788 | return (r_type == elfcpp::R_POWERPC_PLT16_LO |
| 1789 | || r_type == elfcpp::R_POWERPC_PLT16_HI |
| 1790 | || r_type == elfcpp::R_POWERPC_PLT16_HA |
| 1791 | || (size == 64 && r_type == elfcpp::R_PPC64_PLT16_LO_DS)); |
| 1792 | } |
| 1793 | |
| 1794 | // If INSN is an opcode that may be used with an @tls operand, return |
| 1795 | // the transformed insn for TLS optimisation, otherwise return 0. If |
| 1796 | // REG is non-zero only match an insn with RB or RA equal to REG. |
| 1797 | uint32_t |
| 1798 | at_tls_transform(uint32_t insn, unsigned int reg) |
| 1799 | { |
| 1800 | if ((insn & (0x3f << 26)) != 31 << 26) |
| 1801 | return 0; |
| 1802 | |
| 1803 | unsigned int rtra; |
| 1804 | if (reg == 0 || ((insn >> 11) & 0x1f) == reg) |
| 1805 | rtra = insn & ((1 << 26) - (1 << 16)); |
| 1806 | else if (((insn >> 16) & 0x1f) == reg) |
| 1807 | rtra = (insn & (0x1f << 21)) | ((insn & (0x1f << 11)) << 5); |
| 1808 | else |
| 1809 | return 0; |
| 1810 | |
| 1811 | if ((insn & (0x3ff << 1)) == 266 << 1) |
| 1812 | // add -> addi |
| 1813 | insn = 14 << 26; |
| 1814 | else if ((insn & (0x1f << 1)) == 23 << 1 |
| 1815 | && ((insn & (0x1f << 6)) < 14 << 6 |
| 1816 | || ((insn & (0x1f << 6)) >= 16 << 6 |
| 1817 | && (insn & (0x1f << 6)) < 24 << 6))) |
| 1818 | // load and store indexed -> dform |
| 1819 | insn = (32 | ((insn >> 6) & 0x1f)) << 26; |
| 1820 | else if ((insn & (((0x1a << 5) | 0x1f) << 1)) == 21 << 1) |
| 1821 | // ldx, ldux, stdx, stdux -> ld, ldu, std, stdu |
| 1822 | insn = ((58 | ((insn >> 6) & 4)) << 26) | ((insn >> 6) & 1); |
| 1823 | else if ((insn & (((0x1f << 5) | 0x1f) << 1)) == 341 << 1) |
| 1824 | // lwax -> lwa |
| 1825 | insn = (58 << 26) | 2; |
| 1826 | else |
| 1827 | return 0; |
| 1828 | insn |= rtra; |
| 1829 | return insn; |
| 1830 | } |
| 1831 | |
| 1832 | |
| 1833 | template<int size, bool big_endian> |
| 1834 | class Powerpc_relocate_functions |
| 1835 | { |
| 1836 | public: |
| 1837 | enum Overflow_check |
| 1838 | { |
| 1839 | CHECK_NONE, |
| 1840 | CHECK_SIGNED, |
| 1841 | CHECK_UNSIGNED, |
| 1842 | CHECK_BITFIELD, |
| 1843 | CHECK_LOW_INSN, |
| 1844 | CHECK_HIGH_INSN |
| 1845 | }; |
| 1846 | |
| 1847 | enum Status |
| 1848 | { |
| 1849 | STATUS_OK, |
| 1850 | STATUS_OVERFLOW |
| 1851 | }; |
| 1852 | |
| 1853 | private: |
| 1854 | typedef Powerpc_relocate_functions<size, big_endian> This; |
| 1855 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1856 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedAddress; |
| 1857 | |
| 1858 | template<int valsize> |
| 1859 | static inline bool |
| 1860 | has_overflow_signed(Address value) |
| 1861 | { |
| 1862 | // limit = 1 << (valsize - 1) without shift count exceeding size of type |
| 1863 | Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| 1864 | limit <<= ((valsize - 1) >> 1); |
| 1865 | limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| 1866 | return value + limit > (limit << 1) - 1; |
| 1867 | } |
| 1868 | |
| 1869 | template<int valsize> |
| 1870 | static inline bool |
| 1871 | has_overflow_unsigned(Address value) |
| 1872 | { |
| 1873 | Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| 1874 | limit <<= ((valsize - 1) >> 1); |
| 1875 | limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| 1876 | return value > (limit << 1) - 1; |
| 1877 | } |
| 1878 | |
| 1879 | template<int valsize> |
| 1880 | static inline bool |
| 1881 | has_overflow_bitfield(Address value) |
| 1882 | { |
| 1883 | return (has_overflow_unsigned<valsize>(value) |
| 1884 | && has_overflow_signed<valsize>(value)); |
| 1885 | } |
| 1886 | |
| 1887 | template<int valsize> |
| 1888 | static inline Status |
| 1889 | overflowed(Address value, Overflow_check overflow) |
| 1890 | { |
| 1891 | if (overflow == CHECK_SIGNED) |
| 1892 | { |
| 1893 | if (has_overflow_signed<valsize>(value)) |
| 1894 | return STATUS_OVERFLOW; |
| 1895 | } |
| 1896 | else if (overflow == CHECK_UNSIGNED) |
| 1897 | { |
| 1898 | if (has_overflow_unsigned<valsize>(value)) |
| 1899 | return STATUS_OVERFLOW; |
| 1900 | } |
| 1901 | else if (overflow == CHECK_BITFIELD) |
| 1902 | { |
| 1903 | if (has_overflow_bitfield<valsize>(value)) |
| 1904 | return STATUS_OVERFLOW; |
| 1905 | } |
| 1906 | return STATUS_OK; |
| 1907 | } |
| 1908 | |
| 1909 | // Do a simple RELA relocation |
| 1910 | template<int fieldsize, int valsize> |
| 1911 | static inline Status |
| 1912 | rela(unsigned char* view, Address value, Overflow_check overflow) |
| 1913 | { |
| 1914 | typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype; |
| 1915 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 1916 | elfcpp::Swap<fieldsize, big_endian>::writeval(wv, value); |
| 1917 | return overflowed<valsize>(value, overflow); |
| 1918 | } |
| 1919 | |
| 1920 | template<int fieldsize, int valsize> |
| 1921 | static inline Status |
| 1922 | rela(unsigned char* view, |
| 1923 | unsigned int right_shift, |
| 1924 | typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask, |
| 1925 | Address value, |
| 1926 | Overflow_check overflow) |
| 1927 | { |
| 1928 | typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype; |
| 1929 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 1930 | Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(wv); |
| 1931 | Valtype reloc = value >> right_shift; |
| 1932 | val &= ~dst_mask; |
| 1933 | reloc &= dst_mask; |
| 1934 | elfcpp::Swap<fieldsize, big_endian>::writeval(wv, val | reloc); |
| 1935 | return overflowed<valsize>(value >> right_shift, overflow); |
| 1936 | } |
| 1937 | |
| 1938 | // Do a simple RELA relocation, unaligned. |
| 1939 | template<int fieldsize, int valsize> |
| 1940 | static inline Status |
| 1941 | rela_ua(unsigned char* view, Address value, Overflow_check overflow) |
| 1942 | { |
| 1943 | elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, value); |
| 1944 | return overflowed<valsize>(value, overflow); |
| 1945 | } |
| 1946 | |
| 1947 | template<int fieldsize, int valsize> |
| 1948 | static inline Status |
| 1949 | rela_ua(unsigned char* view, |
| 1950 | unsigned int right_shift, |
| 1951 | typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask, |
| 1952 | Address value, |
| 1953 | Overflow_check overflow) |
| 1954 | { |
| 1955 | typedef typename elfcpp::Swap_unaligned<fieldsize, big_endian>::Valtype |
| 1956 | Valtype; |
| 1957 | Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(view); |
| 1958 | Valtype reloc = value >> right_shift; |
| 1959 | val &= ~dst_mask; |
| 1960 | reloc &= dst_mask; |
| 1961 | elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, val | reloc); |
| 1962 | return overflowed<valsize>(value >> right_shift, overflow); |
| 1963 | } |
| 1964 | |
| 1965 | public: |
| 1966 | // R_PPC64_ADDR64: (Symbol + Addend) |
| 1967 | static inline void |
| 1968 | addr64(unsigned char* view, Address value) |
| 1969 | { This::template rela<64,64>(view, value, CHECK_NONE); } |
| 1970 | |
| 1971 | // R_PPC64_UADDR64: (Symbol + Addend) unaligned |
| 1972 | static inline void |
| 1973 | addr64_u(unsigned char* view, Address value) |
| 1974 | { This::template rela_ua<64,64>(view, value, CHECK_NONE); } |
| 1975 | |
| 1976 | // R_POWERPC_ADDR32: (Symbol + Addend) |
| 1977 | static inline Status |
| 1978 | addr32(unsigned char* view, Address value, Overflow_check overflow) |
| 1979 | { return This::template rela<32,32>(view, value, overflow); } |
| 1980 | |
| 1981 | // R_POWERPC_UADDR32: (Symbol + Addend) unaligned |
| 1982 | static inline Status |
| 1983 | addr32_u(unsigned char* view, Address value, Overflow_check overflow) |
| 1984 | { return This::template rela_ua<32,32>(view, value, overflow); } |
| 1985 | |
| 1986 | // R_POWERPC_ADDR24: (Symbol + Addend) & 0x3fffffc |
| 1987 | static inline Status |
| 1988 | addr24(unsigned char* view, Address value, Overflow_check overflow) |
| 1989 | { |
| 1990 | Status stat = This::template rela<32,26>(view, 0, 0x03fffffc, |
| 1991 | value, overflow); |
| 1992 | if (overflow != CHECK_NONE && (value & 3) != 0) |
| 1993 | stat = STATUS_OVERFLOW; |
| 1994 | return stat; |
| 1995 | } |
| 1996 | |
| 1997 | // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff |
| 1998 | static inline Status |
| 1999 | addr16(unsigned char* view, Address value, Overflow_check overflow) |
| 2000 | { return This::template rela<16,16>(view, value, overflow); } |
| 2001 | |
| 2002 | // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff, unaligned |
| 2003 | static inline Status |
| 2004 | addr16_u(unsigned char* view, Address value, Overflow_check overflow) |
| 2005 | { return This::template rela_ua<16,16>(view, value, overflow); } |
| 2006 | |
| 2007 | // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc |
| 2008 | static inline Status |
| 2009 | addr16_ds(unsigned char* view, Address value, Overflow_check overflow) |
| 2010 | { |
| 2011 | Status stat = This::template rela<16,16>(view, 0, 0xfffc, value, overflow); |
| 2012 | if ((value & 3) != 0) |
| 2013 | stat = STATUS_OVERFLOW; |
| 2014 | return stat; |
| 2015 | } |
| 2016 | |
| 2017 | // R_POWERPC_ADDR16_DQ: (Symbol + Addend) & 0xfff0 |
| 2018 | static inline Status |
| 2019 | addr16_dq(unsigned char* view, Address value, Overflow_check overflow) |
| 2020 | { |
| 2021 | Status stat = This::template rela<16,16>(view, 0, 0xfff0, value, overflow); |
| 2022 | if ((value & 15) != 0) |
| 2023 | stat = STATUS_OVERFLOW; |
| 2024 | return stat; |
| 2025 | } |
| 2026 | |
| 2027 | // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff |
| 2028 | static inline void |
| 2029 | addr16_hi(unsigned char* view, Address value) |
| 2030 | { This::template rela<16,16>(view, 16, 0xffff, value, CHECK_NONE); } |
| 2031 | |
| 2032 | // R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff |
| 2033 | static inline void |
| 2034 | addr16_ha(unsigned char* view, Address value) |
| 2035 | { This::addr16_hi(view, value + 0x8000); } |
| 2036 | |
| 2037 | // R_POWERPC_ADDR16_HIGHER: ((Symbol + Addend) >> 32) & 0xffff |
| 2038 | static inline void |
| 2039 | addr16_hi2(unsigned char* view, Address value) |
| 2040 | { This::template rela<16,16>(view, 32, 0xffff, value, CHECK_NONE); } |
| 2041 | |
| 2042 | // R_POWERPC_ADDR16_HIGHERA: ((Symbol + Addend + 0x8000) >> 32) & 0xffff |
| 2043 | static inline void |
| 2044 | addr16_ha2(unsigned char* view, Address value) |
| 2045 | { This::addr16_hi2(view, value + 0x8000); } |
| 2046 | |
| 2047 | // R_POWERPC_ADDR16_HIGHEST: ((Symbol + Addend) >> 48) & 0xffff |
| 2048 | static inline void |
| 2049 | addr16_hi3(unsigned char* view, Address value) |
| 2050 | { This::template rela<16,16>(view, 48, 0xffff, value, CHECK_NONE); } |
| 2051 | |
| 2052 | // R_POWERPC_ADDR16_HIGHESTA: ((Symbol + Addend + 0x8000) >> 48) & 0xffff |
| 2053 | static inline void |
| 2054 | addr16_ha3(unsigned char* view, Address value) |
| 2055 | { This::addr16_hi3(view, value + 0x8000); } |
| 2056 | |
| 2057 | // R_POWERPC_ADDR14: (Symbol + Addend) & 0xfffc |
| 2058 | static inline Status |
| 2059 | addr14(unsigned char* view, Address value, Overflow_check overflow) |
| 2060 | { |
| 2061 | Status stat = This::template rela<32,16>(view, 0, 0xfffc, value, overflow); |
| 2062 | if (overflow != CHECK_NONE && (value & 3) != 0) |
| 2063 | stat = STATUS_OVERFLOW; |
| 2064 | return stat; |
| 2065 | } |
| 2066 | |
| 2067 | // R_POWERPC_REL16DX_HA |
| 2068 | static inline Status |
| 2069 | addr16dx_ha(unsigned char *view, Address value, Overflow_check overflow) |
| 2070 | { |
| 2071 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| 2072 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 2073 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 2074 | value += 0x8000; |
| 2075 | value = static_cast<SignedAddress>(value) >> 16; |
| 2076 | val |= (value & 0xffc1) | ((value & 0x3e) << 15); |
| 2077 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 2078 | return overflowed<16>(value, overflow); |
| 2079 | } |
| 2080 | }; |
| 2081 | |
| 2082 | // Set ABI version for input and output. |
| 2083 | |
| 2084 | template<int size, bool big_endian> |
| 2085 | void |
| 2086 | Powerpc_relobj<size, big_endian>::set_abiversion(int ver) |
| 2087 | { |
| 2088 | this->e_flags_ |= ver; |
| 2089 | if (this->abiversion() != 0) |
| 2090 | { |
| 2091 | Target_powerpc<size, big_endian>* target = |
| 2092 | static_cast<Target_powerpc<size, big_endian>*>( |
| 2093 | parameters->sized_target<size, big_endian>()); |
| 2094 | if (target->abiversion() == 0) |
| 2095 | target->set_abiversion(this->abiversion()); |
| 2096 | else if (target->abiversion() != this->abiversion()) |
| 2097 | gold_error(_("%s: ABI version %d is not compatible " |
| 2098 | "with ABI version %d output"), |
| 2099 | this->name().c_str(), |
| 2100 | this->abiversion(), target->abiversion()); |
| 2101 | |
| 2102 | } |
| 2103 | } |
| 2104 | |
| 2105 | // Stash away the index of .got2, .opd, .rela.toc, and .toc in a |
| 2106 | // relocatable object, if such sections exists. |
| 2107 | |
| 2108 | template<int size, bool big_endian> |
| 2109 | bool |
| 2110 | Powerpc_relobj<size, big_endian>::do_find_special_sections( |
| 2111 | Read_symbols_data* sd) |
| 2112 | { |
| 2113 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 2114 | const unsigned char* namesu = sd->section_names->data(); |
| 2115 | const char* names = reinterpret_cast<const char*>(namesu); |
| 2116 | section_size_type names_size = sd->section_names_size; |
| 2117 | const unsigned char* s; |
| 2118 | |
| 2119 | s = this->template find_shdr<size, big_endian>(pshdrs, |
| 2120 | size == 32 ? ".got2" : ".opd", |
| 2121 | names, names_size, NULL); |
| 2122 | if (s != NULL) |
| 2123 | { |
| 2124 | unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size; |
| 2125 | this->special_ = ndx; |
| 2126 | if (size == 64) |
| 2127 | { |
| 2128 | if (this->abiversion() == 0) |
| 2129 | this->set_abiversion(1); |
| 2130 | else if (this->abiversion() > 1) |
| 2131 | gold_error(_("%s: .opd invalid in abiv%d"), |
| 2132 | this->name().c_str(), this->abiversion()); |
| 2133 | } |
| 2134 | } |
| 2135 | if (size == 64) |
| 2136 | { |
| 2137 | s = this->template find_shdr<size, big_endian>(pshdrs, ".rela.toc", |
| 2138 | names, names_size, NULL); |
| 2139 | if (s != NULL) |
| 2140 | { |
| 2141 | unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size; |
| 2142 | this->relatoc_ = ndx; |
| 2143 | typename elfcpp::Shdr<size, big_endian> shdr(s); |
| 2144 | this->toc_ = this->adjust_shndx(shdr.get_sh_info()); |
| 2145 | } |
| 2146 | } |
| 2147 | return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd); |
| 2148 | } |
| 2149 | |
| 2150 | // Examine .rela.opd to build info about function entry points. |
| 2151 | |
| 2152 | template<int size, bool big_endian> |
| 2153 | void |
| 2154 | Powerpc_relobj<size, big_endian>::scan_opd_relocs( |
| 2155 | size_t reloc_count, |
| 2156 | const unsigned char* prelocs, |
| 2157 | const unsigned char* plocal_syms) |
| 2158 | { |
| 2159 | if (size == 64) |
| 2160 | { |
| 2161 | typedef typename elfcpp::Rela<size, big_endian> Reltype; |
| 2162 | const int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 2163 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 2164 | Address expected_off = 0; |
| 2165 | bool regular = true; |
| 2166 | unsigned int opd_ent_size = 0; |
| 2167 | |
| 2168 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| 2169 | { |
| 2170 | Reltype reloc(prelocs); |
| 2171 | typename elfcpp::Elf_types<size>::Elf_WXword r_info |
| 2172 | = reloc.get_r_info(); |
| 2173 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 2174 | if (r_type == elfcpp::R_PPC64_ADDR64) |
| 2175 | { |
| 2176 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 2177 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
| 2178 | bool is_ordinary; |
| 2179 | unsigned int shndx; |
| 2180 | if (r_sym < this->local_symbol_count()) |
| 2181 | { |
| 2182 | typename elfcpp::Sym<size, big_endian> |
| 2183 | lsym(plocal_syms + r_sym * sym_size); |
| 2184 | shndx = lsym.get_st_shndx(); |
| 2185 | shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| 2186 | value = lsym.get_st_value(); |
| 2187 | } |
| 2188 | else |
| 2189 | shndx = this->symbol_section_and_value(r_sym, &value, |
| 2190 | &is_ordinary); |
| 2191 | this->set_opd_ent(reloc.get_r_offset(), shndx, |
| 2192 | value + reloc.get_r_addend()); |
| 2193 | if (i == 2) |
| 2194 | { |
| 2195 | expected_off = reloc.get_r_offset(); |
| 2196 | opd_ent_size = expected_off; |
| 2197 | } |
| 2198 | else if (expected_off != reloc.get_r_offset()) |
| 2199 | regular = false; |
| 2200 | expected_off += opd_ent_size; |
| 2201 | } |
| 2202 | else if (r_type == elfcpp::R_PPC64_TOC) |
| 2203 | { |
| 2204 | if (expected_off - opd_ent_size + 8 != reloc.get_r_offset()) |
| 2205 | regular = false; |
| 2206 | } |
| 2207 | else |
| 2208 | { |
| 2209 | gold_warning(_("%s: unexpected reloc type %u in .opd section"), |
| 2210 | this->name().c_str(), r_type); |
| 2211 | regular = false; |
| 2212 | } |
| 2213 | } |
| 2214 | if (reloc_count <= 2) |
| 2215 | opd_ent_size = this->section_size(this->opd_shndx()); |
| 2216 | if (opd_ent_size != 24 && opd_ent_size != 16) |
| 2217 | regular = false; |
| 2218 | if (!regular) |
| 2219 | { |
| 2220 | gold_warning(_("%s: .opd is not a regular array of opd entries"), |
| 2221 | this->name().c_str()); |
| 2222 | opd_ent_size = 0; |
| 2223 | } |
| 2224 | } |
| 2225 | } |
| 2226 | |
| 2227 | // Returns true if a code sequence loading the TOC entry at VALUE |
| 2228 | // relative to the TOC pointer can be converted into code calculating |
| 2229 | // a TOC pointer relative offset. |
| 2230 | // If so, the TOC pointer relative offset is stored to VALUE. |
| 2231 | |
| 2232 | template<int size, bool big_endian> |
| 2233 | bool |
| 2234 | Powerpc_relobj<size, big_endian>::make_toc_relative( |
| 2235 | Target_powerpc<size, big_endian>* target, |
| 2236 | Address* value) |
| 2237 | { |
| 2238 | if (size != 64) |
| 2239 | return false; |
| 2240 | |
| 2241 | // With -mcmodel=medium code it is quite possible to have |
| 2242 | // toc-relative relocs referring to objects outside the TOC. |
| 2243 | // Don't try to look at a non-existent TOC. |
| 2244 | if (this->toc_shndx() == 0) |
| 2245 | return false; |
| 2246 | |
| 2247 | // Convert VALUE back to an address by adding got_base (see below), |
| 2248 | // then to an offset in the TOC by subtracting the TOC output |
| 2249 | // section address and the TOC output offset. Since this TOC output |
| 2250 | // section and the got output section are one and the same, we can |
| 2251 | // omit adding and subtracting the output section address. |
| 2252 | Address off = (*value + this->toc_base_offset() |
| 2253 | - this->output_section_offset(this->toc_shndx())); |
| 2254 | // Is this offset in the TOC? -mcmodel=medium code may be using |
| 2255 | // TOC relative access to variables outside the TOC. Those of |
| 2256 | // course can't be optimized. We also don't try to optimize code |
| 2257 | // that is using a different object's TOC. |
| 2258 | if (off >= this->section_size(this->toc_shndx())) |
| 2259 | return false; |
| 2260 | |
| 2261 | if (this->no_toc_opt(off)) |
| 2262 | return false; |
| 2263 | |
| 2264 | section_size_type vlen; |
| 2265 | unsigned char* view = this->get_output_view(this->toc_shndx(), &vlen); |
| 2266 | Address addr = elfcpp::Swap<size, big_endian>::readval(view + off); |
| 2267 | // The TOC pointer |
| 2268 | Address got_base = (target->got_section()->output_section()->address() |
| 2269 | + this->toc_base_offset()); |
| 2270 | addr -= got_base; |
| 2271 | if (addr + (uint64_t) 0x80008000 >= (uint64_t) 1 << 32) |
| 2272 | return false; |
| 2273 | |
| 2274 | *value = addr; |
| 2275 | return true; |
| 2276 | } |
| 2277 | |
| 2278 | // Perform the Sized_relobj_file method, then set up opd info from |
| 2279 | // .opd relocs. |
| 2280 | |
| 2281 | template<int size, bool big_endian> |
| 2282 | void |
| 2283 | Powerpc_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd) |
| 2284 | { |
| 2285 | Sized_relobj_file<size, big_endian>::do_read_relocs(rd); |
| 2286 | if (size == 64) |
| 2287 | { |
| 2288 | for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); |
| 2289 | p != rd->relocs.end(); |
| 2290 | ++p) |
| 2291 | { |
| 2292 | if (p->data_shndx == this->opd_shndx()) |
| 2293 | { |
| 2294 | uint64_t opd_size = this->section_size(this->opd_shndx()); |
| 2295 | gold_assert(opd_size == static_cast<size_t>(opd_size)); |
| 2296 | if (opd_size != 0) |
| 2297 | { |
| 2298 | this->init_opd(opd_size); |
| 2299 | this->scan_opd_relocs(p->reloc_count, p->contents->data(), |
| 2300 | rd->local_symbols->data()); |
| 2301 | } |
| 2302 | break; |
| 2303 | } |
| 2304 | } |
| 2305 | } |
| 2306 | } |
| 2307 | |
| 2308 | // Read the symbols then set up st_other vector. |
| 2309 | |
| 2310 | template<int size, bool big_endian> |
| 2311 | void |
| 2312 | Powerpc_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| 2313 | { |
| 2314 | this->base_read_symbols(sd); |
| 2315 | if (size == 64) |
| 2316 | { |
| 2317 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 2318 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 2319 | const unsigned int loccount = this->do_local_symbol_count(); |
| 2320 | if (loccount != 0) |
| 2321 | { |
| 2322 | this->st_other_.resize(loccount); |
| 2323 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 2324 | off_t locsize = loccount * sym_size; |
| 2325 | const unsigned int symtab_shndx = this->symtab_shndx(); |
| 2326 | const unsigned char *psymtab = pshdrs + symtab_shndx * shdr_size; |
| 2327 | typename elfcpp::Shdr<size, big_endian> shdr(psymtab); |
| 2328 | const unsigned char* psyms = this->get_view(shdr.get_sh_offset(), |
| 2329 | locsize, true, false); |
| 2330 | psyms += sym_size; |
| 2331 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| 2332 | { |
| 2333 | elfcpp::Sym<size, big_endian> sym(psyms); |
| 2334 | unsigned char st_other = sym.get_st_other(); |
| 2335 | this->st_other_[i] = st_other; |
| 2336 | if ((st_other & elfcpp::STO_PPC64_LOCAL_MASK) != 0) |
| 2337 | { |
| 2338 | if (this->abiversion() == 0) |
| 2339 | this->set_abiversion(2); |
| 2340 | else if (this->abiversion() < 2) |
| 2341 | gold_error(_("%s: local symbol %d has invalid st_other" |
| 2342 | " for ABI version 1"), |
| 2343 | this->name().c_str(), i); |
| 2344 | } |
| 2345 | } |
| 2346 | } |
| 2347 | } |
| 2348 | } |
| 2349 | |
| 2350 | template<int size, bool big_endian> |
| 2351 | void |
| 2352 | Powerpc_dynobj<size, big_endian>::set_abiversion(int ver) |
| 2353 | { |
| 2354 | this->e_flags_ |= ver; |
| 2355 | if (this->abiversion() != 0) |
| 2356 | { |
| 2357 | Target_powerpc<size, big_endian>* target = |
| 2358 | static_cast<Target_powerpc<size, big_endian>*>( |
| 2359 | parameters->sized_target<size, big_endian>()); |
| 2360 | if (target->abiversion() == 0) |
| 2361 | target->set_abiversion(this->abiversion()); |
| 2362 | else if (target->abiversion() != this->abiversion()) |
| 2363 | gold_error(_("%s: ABI version %d is not compatible " |
| 2364 | "with ABI version %d output"), |
| 2365 | this->name().c_str(), |
| 2366 | this->abiversion(), target->abiversion()); |
| 2367 | |
| 2368 | } |
| 2369 | } |
| 2370 | |
| 2371 | // Call Sized_dynobj::base_read_symbols to read the symbols then |
| 2372 | // read .opd from a dynamic object, filling in opd_ent_ vector, |
| 2373 | |
| 2374 | template<int size, bool big_endian> |
| 2375 | void |
| 2376 | Powerpc_dynobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| 2377 | { |
| 2378 | this->base_read_symbols(sd); |
| 2379 | if (size == 64) |
| 2380 | { |
| 2381 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 2382 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 2383 | const unsigned char* namesu = sd->section_names->data(); |
| 2384 | const char* names = reinterpret_cast<const char*>(namesu); |
| 2385 | const unsigned char* s = NULL; |
| 2386 | const unsigned char* opd; |
| 2387 | section_size_type opd_size; |
| 2388 | |
| 2389 | // Find and read .opd section. |
| 2390 | while (1) |
| 2391 | { |
| 2392 | s = this->template find_shdr<size, big_endian>(pshdrs, ".opd", names, |
| 2393 | sd->section_names_size, |
| 2394 | s); |
| 2395 | if (s == NULL) |
| 2396 | return; |
| 2397 | |
| 2398 | typename elfcpp::Shdr<size, big_endian> shdr(s); |
| 2399 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
| 2400 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) |
| 2401 | { |
| 2402 | if (this->abiversion() == 0) |
| 2403 | this->set_abiversion(1); |
| 2404 | else if (this->abiversion() > 1) |
| 2405 | gold_error(_("%s: .opd invalid in abiv%d"), |
| 2406 | this->name().c_str(), this->abiversion()); |
| 2407 | |
| 2408 | this->opd_shndx_ = (s - pshdrs) / shdr_size; |
| 2409 | this->opd_address_ = shdr.get_sh_addr(); |
| 2410 | opd_size = convert_to_section_size_type(shdr.get_sh_size()); |
| 2411 | opd = this->get_view(shdr.get_sh_offset(), opd_size, |
| 2412 | true, false); |
| 2413 | break; |
| 2414 | } |
| 2415 | } |
| 2416 | |
| 2417 | // Build set of executable sections. |
| 2418 | // Using a set is probably overkill. There is likely to be only |
| 2419 | // a few executable sections, typically .init, .text and .fini, |
| 2420 | // and they are generally grouped together. |
| 2421 | typedef std::set<Sec_info> Exec_sections; |
| 2422 | Exec_sections exec_sections; |
| 2423 | s = pshdrs; |
| 2424 | for (unsigned int i = 1; i < this->shnum(); ++i, s += shdr_size) |
| 2425 | { |
| 2426 | typename elfcpp::Shdr<size, big_endian> shdr(s); |
| 2427 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
| 2428 | && ((shdr.get_sh_flags() |
| 2429 | & (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) |
| 2430 | == (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) |
| 2431 | && shdr.get_sh_size() != 0) |
| 2432 | { |
| 2433 | exec_sections.insert(Sec_info(shdr.get_sh_addr(), |
| 2434 | shdr.get_sh_size(), i)); |
| 2435 | } |
| 2436 | } |
| 2437 | if (exec_sections.empty()) |
| 2438 | return; |
| 2439 | |
| 2440 | // Look over the OPD entries. This is complicated by the fact |
| 2441 | // that some binaries will use two-word entries while others |
| 2442 | // will use the standard three-word entries. In most cases |
| 2443 | // the third word (the environment pointer for languages like |
| 2444 | // Pascal) is unused and will be zero. If the third word is |
| 2445 | // used it should not be pointing into executable sections, |
| 2446 | // I think. |
| 2447 | this->init_opd(opd_size); |
| 2448 | for (const unsigned char* p = opd; p < opd + opd_size; p += 8) |
| 2449 | { |
| 2450 | typedef typename elfcpp::Swap<64, big_endian>::Valtype Valtype; |
| 2451 | const Valtype* valp = reinterpret_cast<const Valtype*>(p); |
| 2452 | Valtype val = elfcpp::Swap<64, big_endian>::readval(valp); |
| 2453 | if (val == 0) |
| 2454 | // Chances are that this is the third word of an OPD entry. |
| 2455 | continue; |
| 2456 | typename Exec_sections::const_iterator e |
| 2457 | = exec_sections.upper_bound(Sec_info(val, 0, 0)); |
| 2458 | if (e != exec_sections.begin()) |
| 2459 | { |
| 2460 | --e; |
| 2461 | if (e->start <= val && val < e->start + e->len) |
| 2462 | { |
| 2463 | // We have an address in an executable section. |
| 2464 | // VAL ought to be the function entry, set it up. |
| 2465 | this->set_opd_ent(p - opd, e->shndx, val); |
| 2466 | // Skip second word of OPD entry, the TOC pointer. |
| 2467 | p += 8; |
| 2468 | } |
| 2469 | } |
| 2470 | // If we didn't match any executable sections, we likely |
| 2471 | // have a non-zero third word in the OPD entry. |
| 2472 | } |
| 2473 | } |
| 2474 | } |
| 2475 | |
| 2476 | // Relocate sections. |
| 2477 | |
| 2478 | template<int size, bool big_endian> |
| 2479 | void |
| 2480 | Powerpc_relobj<size, big_endian>::do_relocate_sections( |
| 2481 | const Symbol_table* symtab, const Layout* layout, |
| 2482 | const unsigned char* pshdrs, Output_file* of, |
| 2483 | typename Sized_relobj_file<size, big_endian>::Views* pviews) |
| 2484 | { |
| 2485 | unsigned int start = 1; |
| 2486 | if (size == 64 |
| 2487 | && this->relatoc_ != 0 |
| 2488 | && !parameters->options().relocatable()) |
| 2489 | { |
| 2490 | // Relocate .toc first. |
| 2491 | this->relocate_section_range(symtab, layout, pshdrs, of, pviews, |
| 2492 | this->relatoc_, this->relatoc_); |
| 2493 | this->relocate_section_range(symtab, layout, pshdrs, of, pviews, |
| 2494 | 1, this->relatoc_ - 1); |
| 2495 | start = this->relatoc_ + 1; |
| 2496 | } |
| 2497 | this->relocate_section_range(symtab, layout, pshdrs, of, pviews, |
| 2498 | start, this->shnum() - 1); |
| 2499 | |
| 2500 | if (!parameters->options().output_is_position_independent()) |
| 2501 | { |
| 2502 | Target_powerpc<size, big_endian>* target |
| 2503 | = static_cast<Target_powerpc<size, big_endian>*>( |
| 2504 | parameters->sized_target<size, big_endian>()); |
| 2505 | if (target->lplt_section() && target->lplt_section()->data_size() != 0) |
| 2506 | { |
| 2507 | const section_size_type offset = target->lplt_section()->offset(); |
| 2508 | const section_size_type oview_size |
| 2509 | = convert_to_section_size_type(target->lplt_section()->data_size()); |
| 2510 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 2511 | |
| 2512 | bool modified = false; |
| 2513 | unsigned int nsyms = this->local_symbol_count(); |
| 2514 | for (unsigned int i = 0; i < nsyms; i++) |
| 2515 | if (this->local_has_plt_offset(i)) |
| 2516 | { |
| 2517 | Address value = this->local_symbol_value(i, 0); |
| 2518 | if (size == 64) |
| 2519 | value += ppc64_local_entry_offset(i); |
| 2520 | size_t off = this->local_plt_offset(i); |
| 2521 | elfcpp::Swap<size, big_endian>::writeval(oview + off, value); |
| 2522 | modified = true; |
| 2523 | } |
| 2524 | if (modified) |
| 2525 | of->write_output_view(offset, oview_size, oview); |
| 2526 | } |
| 2527 | } |
| 2528 | } |
| 2529 | |
| 2530 | // Set up some symbols. |
| 2531 | |
| 2532 | template<int size, bool big_endian> |
| 2533 | void |
| 2534 | Target_powerpc<size, big_endian>::do_define_standard_symbols( |
| 2535 | Symbol_table* symtab, |
| 2536 | Layout* layout) |
| 2537 | { |
| 2538 | if (size == 32) |
| 2539 | { |
| 2540 | // Define _GLOBAL_OFFSET_TABLE_ to ensure it isn't seen as |
| 2541 | // undefined when scanning relocs (and thus requires |
| 2542 | // non-relative dynamic relocs). The proper value will be |
| 2543 | // updated later. |
| 2544 | Symbol *gotsym = symtab->lookup("_GLOBAL_OFFSET_TABLE_", NULL); |
| 2545 | if (gotsym != NULL && gotsym->is_undefined()) |
| 2546 | { |
| 2547 | Target_powerpc<size, big_endian>* target = |
| 2548 | static_cast<Target_powerpc<size, big_endian>*>( |
| 2549 | parameters->sized_target<size, big_endian>()); |
| 2550 | Output_data_got_powerpc<size, big_endian>* got |
| 2551 | = target->got_section(symtab, layout); |
| 2552 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 2553 | Symbol_table::PREDEFINED, |
| 2554 | got, 0, 0, |
| 2555 | elfcpp::STT_OBJECT, |
| 2556 | elfcpp::STB_LOCAL, |
| 2557 | elfcpp::STV_HIDDEN, 0, |
| 2558 | false, false); |
| 2559 | } |
| 2560 | |
| 2561 | // Define _SDA_BASE_ at the start of the .sdata section + 32768. |
| 2562 | Symbol *sdasym = symtab->lookup("_SDA_BASE_", NULL); |
| 2563 | if (sdasym != NULL && sdasym->is_undefined()) |
| 2564 | { |
| 2565 | Output_data_space* sdata = new Output_data_space(4, "** sdata"); |
| 2566 | Output_section* os |
| 2567 | = layout->add_output_section_data(".sdata", 0, |
| 2568 | elfcpp::SHF_ALLOC |
| 2569 | | elfcpp::SHF_WRITE, |
| 2570 | sdata, ORDER_SMALL_DATA, false); |
| 2571 | symtab->define_in_output_data("_SDA_BASE_", NULL, |
| 2572 | Symbol_table::PREDEFINED, |
| 2573 | os, 32768, 0, elfcpp::STT_OBJECT, |
| 2574 | elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN, |
| 2575 | 0, false, false); |
| 2576 | } |
| 2577 | } |
| 2578 | else |
| 2579 | { |
| 2580 | // Define .TOC. as for 32-bit _GLOBAL_OFFSET_TABLE_ |
| 2581 | Symbol *gotsym = symtab->lookup(".TOC.", NULL); |
| 2582 | if (gotsym != NULL && gotsym->is_undefined()) |
| 2583 | { |
| 2584 | Target_powerpc<size, big_endian>* target = |
| 2585 | static_cast<Target_powerpc<size, big_endian>*>( |
| 2586 | parameters->sized_target<size, big_endian>()); |
| 2587 | Output_data_got_powerpc<size, big_endian>* got |
| 2588 | = target->got_section(symtab, layout); |
| 2589 | symtab->define_in_output_data(".TOC.", NULL, |
| 2590 | Symbol_table::PREDEFINED, |
| 2591 | got, 0x8000, 0, |
| 2592 | elfcpp::STT_OBJECT, |
| 2593 | elfcpp::STB_LOCAL, |
| 2594 | elfcpp::STV_HIDDEN, 0, |
| 2595 | false, false); |
| 2596 | } |
| 2597 | } |
| 2598 | |
| 2599 | this->tls_get_addr_ = symtab->lookup("__tls_get_addr"); |
| 2600 | if (parameters->options().tls_get_addr_optimize() |
| 2601 | && this->tls_get_addr_ != NULL |
| 2602 | && this->tls_get_addr_->in_reg()) |
| 2603 | this->tls_get_addr_opt_ = symtab->lookup("__tls_get_addr_opt"); |
| 2604 | if (this->tls_get_addr_opt_ != NULL) |
| 2605 | { |
| 2606 | if (this->tls_get_addr_->is_undefined() |
| 2607 | || this->tls_get_addr_->is_from_dynobj()) |
| 2608 | { |
| 2609 | // Make it seem as if references to __tls_get_addr are |
| 2610 | // really to __tls_get_addr_opt, so the latter symbol is |
| 2611 | // made dynamic, not the former. |
| 2612 | this->tls_get_addr_->clear_in_reg(); |
| 2613 | this->tls_get_addr_opt_->set_in_reg(); |
| 2614 | } |
| 2615 | // We have a non-dynamic definition for __tls_get_addr. |
| 2616 | // Make __tls_get_addr_opt the same, if it does not already have |
| 2617 | // a non-dynamic definition. |
| 2618 | else if (this->tls_get_addr_opt_->is_undefined() |
| 2619 | || this->tls_get_addr_opt_->is_from_dynobj()) |
| 2620 | { |
| 2621 | Sized_symbol<size>* from |
| 2622 | = static_cast<Sized_symbol<size>*>(this->tls_get_addr_); |
| 2623 | Sized_symbol<size>* to |
| 2624 | = static_cast<Sized_symbol<size>*>(this->tls_get_addr_opt_); |
| 2625 | symtab->clone<size>(to, from); |
| 2626 | } |
| 2627 | } |
| 2628 | } |
| 2629 | |
| 2630 | // Set up PowerPC target specific relobj. |
| 2631 | |
| 2632 | template<int size, bool big_endian> |
| 2633 | Object* |
| 2634 | Target_powerpc<size, big_endian>::do_make_elf_object( |
| 2635 | const std::string& name, |
| 2636 | Input_file* input_file, |
| 2637 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| 2638 | { |
| 2639 | int et = ehdr.get_e_type(); |
| 2640 | // ET_EXEC files are valid input for --just-symbols/-R, |
| 2641 | // and we treat them as relocatable objects. |
| 2642 | if (et == elfcpp::ET_REL |
| 2643 | || (et == elfcpp::ET_EXEC && input_file->just_symbols())) |
| 2644 | { |
| 2645 | Powerpc_relobj<size, big_endian>* obj = |
| 2646 | new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| 2647 | obj->setup(); |
| 2648 | return obj; |
| 2649 | } |
| 2650 | else if (et == elfcpp::ET_DYN) |
| 2651 | { |
| 2652 | Powerpc_dynobj<size, big_endian>* obj = |
| 2653 | new Powerpc_dynobj<size, big_endian>(name, input_file, offset, ehdr); |
| 2654 | obj->setup(); |
| 2655 | return obj; |
| 2656 | } |
| 2657 | else |
| 2658 | { |
| 2659 | gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et); |
| 2660 | return NULL; |
| 2661 | } |
| 2662 | } |
| 2663 | |
| 2664 | template<int size, bool big_endian> |
| 2665 | class Output_data_got_powerpc : public Output_data_got<size, big_endian> |
| 2666 | { |
| 2667 | public: |
| 2668 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; |
| 2669 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn; |
| 2670 | |
| 2671 | Output_data_got_powerpc(Symbol_table* symtab, Layout* layout) |
| 2672 | : Output_data_got<size, big_endian>(), |
| 2673 | symtab_(symtab), layout_(layout), |
| 2674 | header_ent_cnt_(size == 32 ? 3 : 1), |
| 2675 | header_index_(size == 32 ? 0x2000 : 0) |
| 2676 | { |
| 2677 | if (size == 64) |
| 2678 | this->set_addralign(256); |
| 2679 | } |
| 2680 | |
| 2681 | // Override all the Output_data_got methods we use so as to first call |
| 2682 | // reserve_ent(). |
| 2683 | bool |
| 2684 | add_global(Symbol* gsym, unsigned int got_type) |
| 2685 | { |
| 2686 | this->reserve_ent(); |
| 2687 | return Output_data_got<size, big_endian>::add_global(gsym, got_type); |
| 2688 | } |
| 2689 | |
| 2690 | bool |
| 2691 | add_global_plt(Symbol* gsym, unsigned int got_type) |
| 2692 | { |
| 2693 | this->reserve_ent(); |
| 2694 | return Output_data_got<size, big_endian>::add_global_plt(gsym, got_type); |
| 2695 | } |
| 2696 | |
| 2697 | bool |
| 2698 | add_global_tls(Symbol* gsym, unsigned int got_type) |
| 2699 | { return this->add_global_plt(gsym, got_type); } |
| 2700 | |
| 2701 | void |
| 2702 | add_global_with_rel(Symbol* gsym, unsigned int got_type, |
| 2703 | Output_data_reloc_generic* rel_dyn, unsigned int r_type) |
| 2704 | { |
| 2705 | this->reserve_ent(); |
| 2706 | Output_data_got<size, big_endian>:: |
| 2707 | add_global_with_rel(gsym, got_type, rel_dyn, r_type); |
| 2708 | } |
| 2709 | |
| 2710 | void |
| 2711 | add_global_pair_with_rel(Symbol* gsym, unsigned int got_type, |
| 2712 | Output_data_reloc_generic* rel_dyn, |
| 2713 | unsigned int r_type_1, unsigned int r_type_2) |
| 2714 | { |
| 2715 | if (gsym->has_got_offset(got_type)) |
| 2716 | return; |
| 2717 | |
| 2718 | this->reserve_ent(2); |
| 2719 | Output_data_got<size, big_endian>:: |
| 2720 | add_global_pair_with_rel(gsym, got_type, rel_dyn, r_type_1, r_type_2); |
| 2721 | } |
| 2722 | |
| 2723 | bool |
| 2724 | add_local(Relobj* object, unsigned int sym_index, unsigned int got_type) |
| 2725 | { |
| 2726 | this->reserve_ent(); |
| 2727 | return Output_data_got<size, big_endian>::add_local(object, sym_index, |
| 2728 | got_type); |
| 2729 | } |
| 2730 | |
| 2731 | bool |
| 2732 | add_local_plt(Relobj* object, unsigned int sym_index, unsigned int got_type) |
| 2733 | { |
| 2734 | this->reserve_ent(); |
| 2735 | return Output_data_got<size, big_endian>::add_local_plt(object, sym_index, |
| 2736 | got_type); |
| 2737 | } |
| 2738 | |
| 2739 | bool |
| 2740 | add_local_tls(Relobj* object, unsigned int sym_index, unsigned int got_type) |
| 2741 | { return this->add_local_plt(object, sym_index, got_type); } |
| 2742 | |
| 2743 | void |
| 2744 | add_local_tls_pair(Relobj* object, unsigned int sym_index, |
| 2745 | unsigned int got_type, |
| 2746 | Output_data_reloc_generic* rel_dyn, |
| 2747 | unsigned int r_type) |
| 2748 | { |
| 2749 | if (object->local_has_got_offset(sym_index, got_type)) |
| 2750 | return; |
| 2751 | |
| 2752 | this->reserve_ent(2); |
| 2753 | Output_data_got<size, big_endian>:: |
| 2754 | add_local_tls_pair(object, sym_index, got_type, rel_dyn, r_type); |
| 2755 | } |
| 2756 | |
| 2757 | unsigned int |
| 2758 | add_constant(Valtype constant) |
| 2759 | { |
| 2760 | this->reserve_ent(); |
| 2761 | return Output_data_got<size, big_endian>::add_constant(constant); |
| 2762 | } |
| 2763 | |
| 2764 | unsigned int |
| 2765 | add_constant_pair(Valtype c1, Valtype c2) |
| 2766 | { |
| 2767 | this->reserve_ent(2); |
| 2768 | return Output_data_got<size, big_endian>::add_constant_pair(c1, c2); |
| 2769 | } |
| 2770 | |
| 2771 | // Offset of _GLOBAL_OFFSET_TABLE_. |
| 2772 | unsigned int |
| 2773 | g_o_t() const |
| 2774 | { |
| 2775 | return this->got_offset(this->header_index_); |
| 2776 | } |
| 2777 | |
| 2778 | // Offset of base used to access the GOT/TOC. |
| 2779 | // The got/toc pointer reg will be set to this value. |
| 2780 | Valtype |
| 2781 | got_base_offset(const Powerpc_relobj<size, big_endian>* object) const |
| 2782 | { |
| 2783 | if (size == 32) |
| 2784 | return this->g_o_t(); |
| 2785 | else |
| 2786 | return (this->output_section()->address() |
| 2787 | + object->toc_base_offset() |
| 2788 | - this->address()); |
| 2789 | } |
| 2790 | |
| 2791 | // Ensure our GOT has a header. |
| 2792 | void |
| 2793 | set_final_data_size() |
| 2794 | { |
| 2795 | if (this->header_ent_cnt_ != 0) |
| 2796 | this->make_header(); |
| 2797 | Output_data_got<size, big_endian>::set_final_data_size(); |
| 2798 | } |
| 2799 | |
| 2800 | // First word of GOT header needs some values that are not |
| 2801 | // handled by Output_data_got so poke them in here. |
| 2802 | // For 32-bit, address of .dynamic, for 64-bit, address of TOCbase. |
| 2803 | void |
| 2804 | do_write(Output_file* of) |
| 2805 | { |
| 2806 | Valtype val = 0; |
| 2807 | if (size == 32 && this->layout_->dynamic_data() != NULL) |
| 2808 | val = this->layout_->dynamic_section()->address(); |
| 2809 | if (size == 64) |
| 2810 | val = this->output_section()->address() + 0x8000; |
| 2811 | this->replace_constant(this->header_index_, val); |
| 2812 | Output_data_got<size, big_endian>::do_write(of); |
| 2813 | } |
| 2814 | |
| 2815 | private: |
| 2816 | void |
| 2817 | reserve_ent(unsigned int cnt = 1) |
| 2818 | { |
| 2819 | if (this->header_ent_cnt_ == 0) |
| 2820 | return; |
| 2821 | if (this->num_entries() + cnt > this->header_index_) |
| 2822 | this->make_header(); |
| 2823 | } |
| 2824 | |
| 2825 | void |
| 2826 | make_header() |
| 2827 | { |
| 2828 | this->header_ent_cnt_ = 0; |
| 2829 | this->header_index_ = this->num_entries(); |
| 2830 | if (size == 32) |
| 2831 | { |
| 2832 | Output_data_got<size, big_endian>::add_constant(0); |
| 2833 | Output_data_got<size, big_endian>::add_constant(0); |
| 2834 | Output_data_got<size, big_endian>::add_constant(0); |
| 2835 | |
| 2836 | // Define _GLOBAL_OFFSET_TABLE_ at the header |
| 2837 | Symbol *gotsym = this->symtab_->lookup("_GLOBAL_OFFSET_TABLE_", NULL); |
| 2838 | if (gotsym != NULL) |
| 2839 | { |
| 2840 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(gotsym); |
| 2841 | sym->set_value(this->g_o_t()); |
| 2842 | } |
| 2843 | else |
| 2844 | this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 2845 | Symbol_table::PREDEFINED, |
| 2846 | this, this->g_o_t(), 0, |
| 2847 | elfcpp::STT_OBJECT, |
| 2848 | elfcpp::STB_LOCAL, |
| 2849 | elfcpp::STV_HIDDEN, 0, |
| 2850 | false, false); |
| 2851 | } |
| 2852 | else |
| 2853 | Output_data_got<size, big_endian>::add_constant(0); |
| 2854 | } |
| 2855 | |
| 2856 | // Stashed pointers. |
| 2857 | Symbol_table* symtab_; |
| 2858 | Layout* layout_; |
| 2859 | |
| 2860 | // GOT header size. |
| 2861 | unsigned int header_ent_cnt_; |
| 2862 | // GOT header index. |
| 2863 | unsigned int header_index_; |
| 2864 | }; |
| 2865 | |
| 2866 | // Get the GOT section, creating it if necessary. |
| 2867 | |
| 2868 | template<int size, bool big_endian> |
| 2869 | Output_data_got_powerpc<size, big_endian>* |
| 2870 | Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab, |
| 2871 | Layout* layout) |
| 2872 | { |
| 2873 | if (this->got_ == NULL) |
| 2874 | { |
| 2875 | gold_assert(symtab != NULL && layout != NULL); |
| 2876 | |
| 2877 | this->got_ |
| 2878 | = new Output_data_got_powerpc<size, big_endian>(symtab, layout); |
| 2879 | |
| 2880 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 2881 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 2882 | this->got_, ORDER_DATA, false); |
| 2883 | } |
| 2884 | |
| 2885 | return this->got_; |
| 2886 | } |
| 2887 | |
| 2888 | // Get the dynamic reloc section, creating it if necessary. |
| 2889 | |
| 2890 | template<int size, bool big_endian> |
| 2891 | typename Target_powerpc<size, big_endian>::Reloc_section* |
| 2892 | Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout) |
| 2893 | { |
| 2894 | if (this->rela_dyn_ == NULL) |
| 2895 | { |
| 2896 | gold_assert(layout != NULL); |
| 2897 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| 2898 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 2899 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
| 2900 | ORDER_DYNAMIC_RELOCS, false); |
| 2901 | } |
| 2902 | return this->rela_dyn_; |
| 2903 | } |
| 2904 | |
| 2905 | // Similarly, but for ifunc symbols get the one for ifunc. |
| 2906 | |
| 2907 | template<int size, bool big_endian> |
| 2908 | typename Target_powerpc<size, big_endian>::Reloc_section* |
| 2909 | Target_powerpc<size, big_endian>::rela_dyn_section(Symbol_table* symtab, |
| 2910 | Layout* layout, |
| 2911 | bool for_ifunc) |
| 2912 | { |
| 2913 | if (!for_ifunc) |
| 2914 | return this->rela_dyn_section(layout); |
| 2915 | |
| 2916 | if (this->iplt_ == NULL) |
| 2917 | this->make_iplt_section(symtab, layout); |
| 2918 | return this->iplt_->rel_plt(); |
| 2919 | } |
| 2920 | |
| 2921 | class Stub_control |
| 2922 | { |
| 2923 | public: |
| 2924 | // Determine the stub group size. The group size is the absolute |
| 2925 | // value of the parameter --stub-group-size. If --stub-group-size |
| 2926 | // is passed a negative value, we restrict stubs to be always after |
| 2927 | // the stubbed branches. |
| 2928 | Stub_control(int32_t size, bool no_size_errors, bool multi_os) |
| 2929 | : stub_group_size_(abs(size)), stubs_always_after_branch_(size < 0), |
| 2930 | suppress_size_errors_(no_size_errors), multi_os_(multi_os), |
| 2931 | state_(NO_GROUP), group_size_(0), group_start_addr_(0), |
| 2932 | owner_(NULL), output_section_(NULL) |
| 2933 | { |
| 2934 | } |
| 2935 | |
| 2936 | // Return true iff input section can be handled by current stub |
| 2937 | // group. |
| 2938 | bool |
| 2939 | can_add_to_stub_group(Output_section* o, |
| 2940 | const Output_section::Input_section* i, |
| 2941 | bool has14); |
| 2942 | |
| 2943 | const Output_section::Input_section* |
| 2944 | owner() |
| 2945 | { return owner_; } |
| 2946 | |
| 2947 | Output_section* |
| 2948 | output_section() |
| 2949 | { return output_section_; } |
| 2950 | |
| 2951 | void |
| 2952 | set_output_and_owner(Output_section* o, |
| 2953 | const Output_section::Input_section* i) |
| 2954 | { |
| 2955 | this->output_section_ = o; |
| 2956 | this->owner_ = i; |
| 2957 | } |
| 2958 | |
| 2959 | private: |
| 2960 | typedef enum |
| 2961 | { |
| 2962 | // Initial state. |
| 2963 | NO_GROUP, |
| 2964 | // Adding group sections before the stubs. |
| 2965 | FINDING_STUB_SECTION, |
| 2966 | // Adding group sections after the stubs. |
| 2967 | HAS_STUB_SECTION |
| 2968 | } State; |
| 2969 | |
| 2970 | uint32_t stub_group_size_; |
| 2971 | bool stubs_always_after_branch_; |
| 2972 | bool suppress_size_errors_; |
| 2973 | // True if a stub group can serve multiple output sections. |
| 2974 | bool multi_os_; |
| 2975 | State state_; |
| 2976 | // Current max size of group. Starts at stub_group_size_ but is |
| 2977 | // reduced to stub_group_size_/1024 on seeing a section with |
| 2978 | // external conditional branches. |
| 2979 | uint32_t group_size_; |
| 2980 | uint64_t group_start_addr_; |
| 2981 | // owner_ and output_section_ specify the section to which stubs are |
| 2982 | // attached. The stubs are placed at the end of this section. |
| 2983 | const Output_section::Input_section* owner_; |
| 2984 | Output_section* output_section_; |
| 2985 | }; |
| 2986 | |
| 2987 | // Return true iff input section can be handled by current stub |
| 2988 | // group. Sections are presented to this function in order, |
| 2989 | // so the first section is the head of the group. |
| 2990 | |
| 2991 | bool |
| 2992 | Stub_control::can_add_to_stub_group(Output_section* o, |
| 2993 | const Output_section::Input_section* i, |
| 2994 | bool has14) |
| 2995 | { |
| 2996 | bool whole_sec = o->order() == ORDER_INIT || o->order() == ORDER_FINI; |
| 2997 | uint64_t this_size; |
| 2998 | uint64_t start_addr = o->address(); |
| 2999 | |
| 3000 | if (whole_sec) |
| 3001 | // .init and .fini sections are pasted together to form a single |
| 3002 | // function. We can't be adding stubs in the middle of the function. |
| 3003 | this_size = o->data_size(); |
| 3004 | else |
| 3005 | { |
| 3006 | start_addr += i->relobj()->output_section_offset(i->shndx()); |
| 3007 | this_size = i->data_size(); |
| 3008 | } |
| 3009 | |
| 3010 | uint64_t end_addr = start_addr + this_size; |
| 3011 | uint32_t group_size = this->stub_group_size_; |
| 3012 | if (has14) |
| 3013 | this->group_size_ = group_size = group_size >> 10; |
| 3014 | |
| 3015 | if (this_size > group_size && !this->suppress_size_errors_) |
| 3016 | gold_warning(_("%s:%s exceeds group size"), |
| 3017 | i->relobj()->name().c_str(), |
| 3018 | i->relobj()->section_name(i->shndx()).c_str()); |
| 3019 | |
| 3020 | gold_debug(DEBUG_TARGET, "maybe add%s %s:%s size=%#llx total=%#llx", |
| 3021 | has14 ? " 14bit" : "", |
| 3022 | i->relobj()->name().c_str(), |
| 3023 | i->relobj()->section_name(i->shndx()).c_str(), |
| 3024 | (long long) this_size, |
| 3025 | (this->state_ == NO_GROUP |
| 3026 | ? this_size |
| 3027 | : (long long) end_addr - this->group_start_addr_)); |
| 3028 | |
| 3029 | if (this->state_ == NO_GROUP) |
| 3030 | { |
| 3031 | // Only here on very first use of Stub_control |
| 3032 | this->owner_ = i; |
| 3033 | this->output_section_ = o; |
| 3034 | this->state_ = FINDING_STUB_SECTION; |
| 3035 | this->group_size_ = group_size; |
| 3036 | this->group_start_addr_ = start_addr; |
| 3037 | return true; |
| 3038 | } |
| 3039 | else if (!this->multi_os_ && this->output_section_ != o) |
| 3040 | ; |
| 3041 | else if (this->state_ == HAS_STUB_SECTION) |
| 3042 | { |
| 3043 | // Can we add this section, which is after the stubs, to the |
| 3044 | // group? |
| 3045 | if (end_addr - this->group_start_addr_ <= this->group_size_) |
| 3046 | return true; |
| 3047 | } |
| 3048 | else if (this->state_ == FINDING_STUB_SECTION) |
| 3049 | { |
| 3050 | if ((whole_sec && this->output_section_ == o) |
| 3051 | || end_addr - this->group_start_addr_ <= this->group_size_) |
| 3052 | { |
| 3053 | // Stubs are added at the end of "owner_". |
| 3054 | this->owner_ = i; |
| 3055 | this->output_section_ = o; |
| 3056 | return true; |
| 3057 | } |
| 3058 | // The group before the stubs has reached maximum size. |
| 3059 | // Now see about adding sections after the stubs to the |
| 3060 | // group. If the current section has a 14-bit branch and |
| 3061 | // the group before the stubs exceeds group_size_ (because |
| 3062 | // they didn't have 14-bit branches), don't add sections |
| 3063 | // after the stubs: The size of stubs for such a large |
| 3064 | // group may exceed the reach of a 14-bit branch. |
| 3065 | if (!this->stubs_always_after_branch_ |
| 3066 | && this_size <= this->group_size_ |
| 3067 | && start_addr - this->group_start_addr_ <= this->group_size_) |
| 3068 | { |
| 3069 | gold_debug(DEBUG_TARGET, "adding after stubs"); |
| 3070 | this->state_ = HAS_STUB_SECTION; |
| 3071 | this->group_start_addr_ = start_addr; |
| 3072 | return true; |
| 3073 | } |
| 3074 | } |
| 3075 | else |
| 3076 | gold_unreachable(); |
| 3077 | |
| 3078 | gold_debug(DEBUG_TARGET, |
| 3079 | !this->multi_os_ && this->output_section_ != o |
| 3080 | ? "nope, new output section\n" |
| 3081 | : "nope, didn't fit\n"); |
| 3082 | |
| 3083 | // The section fails to fit in the current group. Set up a few |
| 3084 | // things for the next group. owner_ and output_section_ will be |
| 3085 | // set later after we've retrieved those values for the current |
| 3086 | // group. |
| 3087 | this->state_ = FINDING_STUB_SECTION; |
| 3088 | this->group_size_ = group_size; |
| 3089 | this->group_start_addr_ = start_addr; |
| 3090 | return false; |
| 3091 | } |
| 3092 | |
| 3093 | // Look over all the input sections, deciding where to place stubs. |
| 3094 | |
| 3095 | template<int size, bool big_endian> |
| 3096 | void |
| 3097 | Target_powerpc<size, big_endian>::group_sections(Layout* layout, |
| 3098 | const Task*, |
| 3099 | bool no_size_errors) |
| 3100 | { |
| 3101 | Stub_control stub_control(this->stub_group_size_, no_size_errors, |
| 3102 | parameters->options().stub_group_multi()); |
| 3103 | |
| 3104 | // Group input sections and insert stub table |
| 3105 | Stub_table_owner* table_owner = NULL; |
| 3106 | std::vector<Stub_table_owner*> tables; |
| 3107 | Layout::Section_list section_list; |
| 3108 | layout->get_executable_sections(§ion_list); |
| 3109 | std::stable_sort(section_list.begin(), section_list.end(), Sort_sections()); |
| 3110 | for (Layout::Section_list::iterator o = section_list.begin(); |
| 3111 | o != section_list.end(); |
| 3112 | ++o) |
| 3113 | { |
| 3114 | typedef Output_section::Input_section_list Input_section_list; |
| 3115 | for (Input_section_list::const_iterator i |
| 3116 | = (*o)->input_sections().begin(); |
| 3117 | i != (*o)->input_sections().end(); |
| 3118 | ++i) |
| 3119 | { |
| 3120 | if (i->is_input_section() |
| 3121 | || i->is_relaxed_input_section()) |
| 3122 | { |
| 3123 | Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 3124 | <Powerpc_relobj<size, big_endian>*>(i->relobj()); |
| 3125 | bool has14 = ppcobj->has_14bit_branch(i->shndx()); |
| 3126 | if (!stub_control.can_add_to_stub_group(*o, &*i, has14)) |
| 3127 | { |
| 3128 | table_owner->output_section = stub_control.output_section(); |
| 3129 | table_owner->owner = stub_control.owner(); |
| 3130 | stub_control.set_output_and_owner(*o, &*i); |
| 3131 | table_owner = NULL; |
| 3132 | } |
| 3133 | if (table_owner == NULL) |
| 3134 | { |
| 3135 | table_owner = new Stub_table_owner; |
| 3136 | tables.push_back(table_owner); |
| 3137 | } |
| 3138 | ppcobj->set_stub_table(i->shndx(), tables.size() - 1); |
| 3139 | } |
| 3140 | } |
| 3141 | } |
| 3142 | if (table_owner != NULL) |
| 3143 | { |
| 3144 | table_owner->output_section = stub_control.output_section(); |
| 3145 | table_owner->owner = stub_control.owner();; |
| 3146 | } |
| 3147 | for (typename std::vector<Stub_table_owner*>::iterator t = tables.begin(); |
| 3148 | t != tables.end(); |
| 3149 | ++t) |
| 3150 | { |
| 3151 | Stub_table<size, big_endian>* stub_table; |
| 3152 | |
| 3153 | if ((*t)->owner->is_input_section()) |
| 3154 | stub_table = new Stub_table<size, big_endian>(this, |
| 3155 | (*t)->output_section, |
| 3156 | (*t)->owner, |
| 3157 | this->stub_tables_.size()); |
| 3158 | else if ((*t)->owner->is_relaxed_input_section()) |
| 3159 | stub_table = static_cast<Stub_table<size, big_endian>*>( |
| 3160 | (*t)->owner->relaxed_input_section()); |
| 3161 | else |
| 3162 | gold_unreachable(); |
| 3163 | this->stub_tables_.push_back(stub_table); |
| 3164 | delete *t; |
| 3165 | } |
| 3166 | } |
| 3167 | |
| 3168 | static unsigned long |
| 3169 | max_branch_delta (unsigned int r_type) |
| 3170 | { |
| 3171 | if (r_type == elfcpp::R_POWERPC_REL14 |
| 3172 | || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN |
| 3173 | || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN) |
| 3174 | return 1L << 15; |
| 3175 | if (r_type == elfcpp::R_POWERPC_REL24 |
| 3176 | || r_type == elfcpp::R_PPC_PLTREL24 |
| 3177 | || r_type == elfcpp::R_PPC_LOCAL24PC) |
| 3178 | return 1L << 25; |
| 3179 | return 0; |
| 3180 | } |
| 3181 | |
| 3182 | // Return whether this branch is going via a plt call stub. |
| 3183 | |
| 3184 | template<int size, bool big_endian> |
| 3185 | bool |
| 3186 | Target_powerpc<size, big_endian>::Branch_info::mark_pltcall( |
| 3187 | Powerpc_relobj<size, big_endian>* ppc_object, |
| 3188 | unsigned int shndx, |
| 3189 | Address offset, |
| 3190 | Target_powerpc* target, |
| 3191 | Symbol_table* symtab) |
| 3192 | { |
| 3193 | if (this->object_ != ppc_object |
| 3194 | || this->shndx_ != shndx |
| 3195 | || this->offset_ != offset) |
| 3196 | return false; |
| 3197 | |
| 3198 | Symbol* sym = this->object_->global_symbol(this->r_sym_); |
| 3199 | if (sym != NULL && sym->is_forwarder()) |
| 3200 | sym = symtab->resolve_forwards(sym); |
| 3201 | if (target->replace_tls_get_addr(sym)) |
| 3202 | sym = target->tls_get_addr_opt(); |
| 3203 | const Sized_symbol<size>* gsym = static_cast<const Sized_symbol<size>*>(sym); |
| 3204 | if (gsym != NULL |
| 3205 | ? (gsym->use_plt_offset(Scan::get_reference_flags(this->r_type_, target)) |
| 3206 | && !target->is_elfv2_localentry0(gsym)) |
| 3207 | : (this->object_->local_has_plt_offset(this->r_sym_) |
| 3208 | && !target->is_elfv2_localentry0(this->object_, this->r_sym_))) |
| 3209 | { |
| 3210 | this->tocsave_ = 1; |
| 3211 | return true; |
| 3212 | } |
| 3213 | return false; |
| 3214 | } |
| 3215 | |
| 3216 | // If this branch needs a plt call stub, or a long branch stub, make one. |
| 3217 | |
| 3218 | template<int size, bool big_endian> |
| 3219 | bool |
| 3220 | Target_powerpc<size, big_endian>::Branch_info::make_stub( |
| 3221 | Stub_table<size, big_endian>* stub_table, |
| 3222 | Stub_table<size, big_endian>* ifunc_stub_table, |
| 3223 | Symbol_table* symtab) const |
| 3224 | { |
| 3225 | Symbol* sym = this->object_->global_symbol(this->r_sym_); |
| 3226 | Target_powerpc<size, big_endian>* target = |
| 3227 | static_cast<Target_powerpc<size, big_endian>*>( |
| 3228 | parameters->sized_target<size, big_endian>()); |
| 3229 | if (sym != NULL && sym->is_forwarder()) |
| 3230 | sym = symtab->resolve_forwards(sym); |
| 3231 | if (target->replace_tls_get_addr(sym)) |
| 3232 | sym = target->tls_get_addr_opt(); |
| 3233 | const Sized_symbol<size>* gsym = static_cast<const Sized_symbol<size>*>(sym); |
| 3234 | bool ok = true; |
| 3235 | |
| 3236 | if (gsym != NULL |
| 3237 | ? gsym->use_plt_offset(Scan::get_reference_flags(this->r_type_, target)) |
| 3238 | : this->object_->local_has_plt_offset(this->r_sym_)) |
| 3239 | { |
| 3240 | if (size == 64 |
| 3241 | && gsym != NULL |
| 3242 | && target->abiversion() >= 2 |
| 3243 | && !parameters->options().output_is_position_independent() |
| 3244 | && !is_branch_reloc(this->r_type_)) |
| 3245 | target->glink_section()->add_global_entry(gsym); |
| 3246 | else |
| 3247 | { |
| 3248 | if (stub_table == NULL |
| 3249 | && !(size == 32 |
| 3250 | && gsym != NULL |
| 3251 | && !parameters->options().output_is_position_independent() |
| 3252 | && !is_branch_reloc(this->r_type_))) |
| 3253 | stub_table = this->object_->stub_table(this->shndx_); |
| 3254 | if (stub_table == NULL) |
| 3255 | { |
| 3256 | // This is a ref from a data section to an ifunc symbol, |
| 3257 | // or a non-branch reloc for which we always want to use |
| 3258 | // one set of stubs for resolving function addresses. |
| 3259 | stub_table = ifunc_stub_table; |
| 3260 | } |
| 3261 | gold_assert(stub_table != NULL); |
| 3262 | Address from = this->object_->get_output_section_offset(this->shndx_); |
| 3263 | if (from != invalid_address) |
| 3264 | from += (this->object_->output_section(this->shndx_)->address() |
| 3265 | + this->offset_); |
| 3266 | if (gsym != NULL) |
| 3267 | ok = stub_table->add_plt_call_entry(from, |
| 3268 | this->object_, gsym, |
| 3269 | this->r_type_, this->addend_, |
| 3270 | this->tocsave_); |
| 3271 | else |
| 3272 | ok = stub_table->add_plt_call_entry(from, |
| 3273 | this->object_, this->r_sym_, |
| 3274 | this->r_type_, this->addend_, |
| 3275 | this->tocsave_); |
| 3276 | } |
| 3277 | } |
| 3278 | else |
| 3279 | { |
| 3280 | Address max_branch_offset = max_branch_delta(this->r_type_); |
| 3281 | if (max_branch_offset == 0) |
| 3282 | return true; |
| 3283 | Address from = this->object_->get_output_section_offset(this->shndx_); |
| 3284 | gold_assert(from != invalid_address); |
| 3285 | from += (this->object_->output_section(this->shndx_)->address() |
| 3286 | + this->offset_); |
| 3287 | Address to; |
| 3288 | if (gsym != NULL) |
| 3289 | { |
| 3290 | switch (gsym->source()) |
| 3291 | { |
| 3292 | case Symbol::FROM_OBJECT: |
| 3293 | { |
| 3294 | Object* symobj = gsym->object(); |
| 3295 | if (symobj->is_dynamic() |
| 3296 | || symobj->pluginobj() != NULL) |
| 3297 | return true; |
| 3298 | bool is_ordinary; |
| 3299 | unsigned int shndx = gsym->shndx(&is_ordinary); |
| 3300 | if (shndx == elfcpp::SHN_UNDEF) |
| 3301 | return true; |
| 3302 | } |
| 3303 | break; |
| 3304 | |
| 3305 | case Symbol::IS_UNDEFINED: |
| 3306 | return true; |
| 3307 | |
| 3308 | default: |
| 3309 | break; |
| 3310 | } |
| 3311 | Symbol_table::Compute_final_value_status status; |
| 3312 | to = symtab->compute_final_value<size>(gsym, &status); |
| 3313 | if (status != Symbol_table::CFVS_OK) |
| 3314 | return true; |
| 3315 | if (size == 64) |
| 3316 | to += this->object_->ppc64_local_entry_offset(gsym); |
| 3317 | } |
| 3318 | else |
| 3319 | { |
| 3320 | const Symbol_value<size>* psymval |
| 3321 | = this->object_->local_symbol(this->r_sym_); |
| 3322 | Symbol_value<size> symval; |
| 3323 | if (psymval->is_section_symbol()) |
| 3324 | symval.set_is_section_symbol(); |
| 3325 | typedef Sized_relobj_file<size, big_endian> ObjType; |
| 3326 | typename ObjType::Compute_final_local_value_status status |
| 3327 | = this->object_->compute_final_local_value(this->r_sym_, psymval, |
| 3328 | &symval, symtab); |
| 3329 | if (status != ObjType::CFLV_OK |
| 3330 | || !symval.has_output_value()) |
| 3331 | return true; |
| 3332 | to = symval.value(this->object_, 0); |
| 3333 | if (size == 64) |
| 3334 | to += this->object_->ppc64_local_entry_offset(this->r_sym_); |
| 3335 | } |
| 3336 | if (!(size == 32 && this->r_type_ == elfcpp::R_PPC_PLTREL24)) |
| 3337 | to += this->addend_; |
| 3338 | if (stub_table == NULL) |
| 3339 | stub_table = this->object_->stub_table(this->shndx_); |
| 3340 | if (size == 64 && target->abiversion() < 2) |
| 3341 | { |
| 3342 | unsigned int dest_shndx; |
| 3343 | if (!target->symval_for_branch(symtab, gsym, this->object_, |
| 3344 | &to, &dest_shndx)) |
| 3345 | return true; |
| 3346 | } |
| 3347 | Address delta = to - from; |
| 3348 | if (delta + max_branch_offset >= 2 * max_branch_offset) |
| 3349 | { |
| 3350 | if (stub_table == NULL) |
| 3351 | { |
| 3352 | gold_warning(_("%s:%s: branch in non-executable section," |
| 3353 | " no long branch stub for you"), |
| 3354 | this->object_->name().c_str(), |
| 3355 | this->object_->section_name(this->shndx_).c_str()); |
| 3356 | return true; |
| 3357 | } |
| 3358 | bool save_res = (size == 64 |
| 3359 | && gsym != NULL |
| 3360 | && gsym->source() == Symbol::IN_OUTPUT_DATA |
| 3361 | && gsym->output_data() == target->savres_section()); |
| 3362 | ok = stub_table->add_long_branch_entry(this->object_, |
| 3363 | this->r_type_, |
| 3364 | from, to, save_res); |
| 3365 | } |
| 3366 | } |
| 3367 | if (!ok) |
| 3368 | gold_debug(DEBUG_TARGET, |
| 3369 | "branch at %s:%s+%#lx\n" |
| 3370 | "can't reach stub attached to %s:%s", |
| 3371 | this->object_->name().c_str(), |
| 3372 | this->object_->section_name(this->shndx_).c_str(), |
| 3373 | (unsigned long) this->offset_, |
| 3374 | stub_table->relobj()->name().c_str(), |
| 3375 | stub_table->relobj()->section_name(stub_table->shndx()).c_str()); |
| 3376 | |
| 3377 | return ok; |
| 3378 | } |
| 3379 | |
| 3380 | // Relaxation hook. This is where we do stub generation. |
| 3381 | |
| 3382 | template<int size, bool big_endian> |
| 3383 | bool |
| 3384 | Target_powerpc<size, big_endian>::do_relax(int pass, |
| 3385 | const Input_objects*, |
| 3386 | Symbol_table* symtab, |
| 3387 | Layout* layout, |
| 3388 | const Task* task) |
| 3389 | { |
| 3390 | unsigned int prev_brlt_size = 0; |
| 3391 | if (pass == 1) |
| 3392 | { |
| 3393 | bool thread_safe |
| 3394 | = this->abiversion() < 2 && parameters->options().plt_thread_safe(); |
| 3395 | if (size == 64 |
| 3396 | && this->abiversion() < 2 |
| 3397 | && !thread_safe |
| 3398 | && !parameters->options().user_set_plt_thread_safe()) |
| 3399 | { |
| 3400 | static const char* const thread_starter[] = |
| 3401 | { |
| 3402 | "pthread_create", |
| 3403 | /* libstdc++ */ |
| 3404 | "_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE", |
| 3405 | /* librt */ |
| 3406 | "aio_init", "aio_read", "aio_write", "aio_fsync", "lio_listio", |
| 3407 | "mq_notify", "create_timer", |
| 3408 | /* libanl */ |
| 3409 | "getaddrinfo_a", |
| 3410 | /* libgomp */ |
| 3411 | "GOMP_parallel", |
| 3412 | "GOMP_parallel_start", |
| 3413 | "GOMP_parallel_loop_static", |
| 3414 | "GOMP_parallel_loop_static_start", |
| 3415 | "GOMP_parallel_loop_dynamic", |
| 3416 | "GOMP_parallel_loop_dynamic_start", |
| 3417 | "GOMP_parallel_loop_guided", |
| 3418 | "GOMP_parallel_loop_guided_start", |
| 3419 | "GOMP_parallel_loop_runtime", |
| 3420 | "GOMP_parallel_loop_runtime_start", |
| 3421 | "GOMP_parallel_sections", |
| 3422 | "GOMP_parallel_sections_start", |
| 3423 | /* libgo */ |
| 3424 | "__go_go", |
| 3425 | }; |
| 3426 | |
| 3427 | if (parameters->options().shared()) |
| 3428 | thread_safe = true; |
| 3429 | else |
| 3430 | { |
| 3431 | for (unsigned int i = 0; |
| 3432 | i < sizeof(thread_starter) / sizeof(thread_starter[0]); |
| 3433 | i++) |
| 3434 | { |
| 3435 | Symbol* sym = symtab->lookup(thread_starter[i], NULL); |
| 3436 | thread_safe = (sym != NULL |
| 3437 | && sym->in_reg() |
| 3438 | && sym->in_real_elf()); |
| 3439 | if (thread_safe) |
| 3440 | break; |
| 3441 | } |
| 3442 | } |
| 3443 | } |
| 3444 | this->plt_thread_safe_ = thread_safe; |
| 3445 | } |
| 3446 | |
| 3447 | if (pass == 1) |
| 3448 | { |
| 3449 | this->stub_group_size_ = parameters->options().stub_group_size(); |
| 3450 | bool no_size_errors = true; |
| 3451 | if (this->stub_group_size_ == 1) |
| 3452 | this->stub_group_size_ = 0x1c00000; |
| 3453 | else if (this->stub_group_size_ == -1) |
| 3454 | this->stub_group_size_ = -0x1e00000; |
| 3455 | else |
| 3456 | no_size_errors = false; |
| 3457 | this->group_sections(layout, task, no_size_errors); |
| 3458 | } |
| 3459 | else if (this->relax_failed_ && this->relax_fail_count_ < 3) |
| 3460 | { |
| 3461 | this->branch_lookup_table_.clear(); |
| 3462 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 3463 | p != this->stub_tables_.end(); |
| 3464 | ++p) |
| 3465 | { |
| 3466 | (*p)->clear_stubs(true); |
| 3467 | } |
| 3468 | this->stub_tables_.clear(); |
| 3469 | this->stub_group_size_ = this->stub_group_size_ / 4 * 3; |
| 3470 | gold_info(_("%s: stub group size is too large; retrying with %#x"), |
| 3471 | program_name, this->stub_group_size_); |
| 3472 | this->group_sections(layout, task, true); |
| 3473 | } |
| 3474 | |
| 3475 | // We need address of stub tables valid for make_stub. |
| 3476 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 3477 | p != this->stub_tables_.end(); |
| 3478 | ++p) |
| 3479 | { |
| 3480 | const Powerpc_relobj<size, big_endian>* object |
| 3481 | = static_cast<const Powerpc_relobj<size, big_endian>*>((*p)->relobj()); |
| 3482 | Address off = object->get_output_section_offset((*p)->shndx()); |
| 3483 | gold_assert(off != invalid_address); |
| 3484 | Output_section* os = (*p)->output_section(); |
| 3485 | (*p)->set_address_and_size(os, off); |
| 3486 | } |
| 3487 | |
| 3488 | if (pass != 1) |
| 3489 | { |
| 3490 | // Clear plt call stubs, long branch stubs and branch lookup table. |
| 3491 | prev_brlt_size = this->branch_lookup_table_.size(); |
| 3492 | this->branch_lookup_table_.clear(); |
| 3493 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 3494 | p != this->stub_tables_.end(); |
| 3495 | ++p) |
| 3496 | { |
| 3497 | (*p)->clear_stubs(false); |
| 3498 | } |
| 3499 | } |
| 3500 | |
| 3501 | // Build all the stubs. |
| 3502 | this->relax_failed_ = false; |
| 3503 | Stub_table<size, big_endian>* ifunc_stub_table |
| 3504 | = this->stub_tables_.size() == 0 ? NULL : this->stub_tables_[0]; |
| 3505 | Stub_table<size, big_endian>* one_stub_table |
| 3506 | = this->stub_tables_.size() != 1 ? NULL : ifunc_stub_table; |
| 3507 | for (typename Branches::const_iterator b = this->branch_info_.begin(); |
| 3508 | b != this->branch_info_.end(); |
| 3509 | b++) |
| 3510 | { |
| 3511 | if (!b->make_stub(one_stub_table, ifunc_stub_table, symtab) |
| 3512 | && !this->relax_failed_) |
| 3513 | { |
| 3514 | this->relax_failed_ = true; |
| 3515 | this->relax_fail_count_++; |
| 3516 | if (this->relax_fail_count_ < 3) |
| 3517 | return true; |
| 3518 | } |
| 3519 | } |
| 3520 | |
| 3521 | // Did anything change size? |
| 3522 | unsigned int num_huge_branches = this->branch_lookup_table_.size(); |
| 3523 | bool again = num_huge_branches != prev_brlt_size; |
| 3524 | if (size == 64 && num_huge_branches != 0) |
| 3525 | this->make_brlt_section(layout); |
| 3526 | if (size == 64 && again) |
| 3527 | this->brlt_section_->set_current_size(num_huge_branches); |
| 3528 | |
| 3529 | for (typename Stub_tables::reverse_iterator p = this->stub_tables_.rbegin(); |
| 3530 | p != this->stub_tables_.rend(); |
| 3531 | ++p) |
| 3532 | (*p)->remove_eh_frame(layout); |
| 3533 | |
| 3534 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 3535 | p != this->stub_tables_.end(); |
| 3536 | ++p) |
| 3537 | (*p)->add_eh_frame(layout); |
| 3538 | |
| 3539 | typedef Unordered_set<Output_section*> Output_sections; |
| 3540 | Output_sections os_need_update; |
| 3541 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 3542 | p != this->stub_tables_.end(); |
| 3543 | ++p) |
| 3544 | { |
| 3545 | if ((*p)->size_update()) |
| 3546 | { |
| 3547 | again = true; |
| 3548 | os_need_update.insert((*p)->output_section()); |
| 3549 | } |
| 3550 | } |
| 3551 | |
| 3552 | // Set output section offsets for all input sections in an output |
| 3553 | // section that just changed size. Anything past the stubs will |
| 3554 | // need updating. |
| 3555 | for (typename Output_sections::iterator p = os_need_update.begin(); |
| 3556 | p != os_need_update.end(); |
| 3557 | p++) |
| 3558 | { |
| 3559 | Output_section* os = *p; |
| 3560 | Address off = 0; |
| 3561 | typedef Output_section::Input_section_list Input_section_list; |
| 3562 | for (Input_section_list::const_iterator i = os->input_sections().begin(); |
| 3563 | i != os->input_sections().end(); |
| 3564 | ++i) |
| 3565 | { |
| 3566 | off = align_address(off, i->addralign()); |
| 3567 | if (i->is_input_section() || i->is_relaxed_input_section()) |
| 3568 | i->relobj()->set_section_offset(i->shndx(), off); |
| 3569 | if (i->is_relaxed_input_section()) |
| 3570 | { |
| 3571 | Stub_table<size, big_endian>* stub_table |
| 3572 | = static_cast<Stub_table<size, big_endian>*>( |
| 3573 | i->relaxed_input_section()); |
| 3574 | Address stub_table_size = stub_table->set_address_and_size(os, off); |
| 3575 | off += stub_table_size; |
| 3576 | // After a few iterations, set current stub table size |
| 3577 | // as min size threshold, so later stub tables can only |
| 3578 | // grow in size. |
| 3579 | if (pass >= 4) |
| 3580 | stub_table->set_min_size_threshold(stub_table_size); |
| 3581 | } |
| 3582 | else |
| 3583 | off += i->data_size(); |
| 3584 | } |
| 3585 | // If .branch_lt is part of this output section, then we have |
| 3586 | // just done the offset adjustment. |
| 3587 | os->clear_section_offsets_need_adjustment(); |
| 3588 | } |
| 3589 | |
| 3590 | if (size == 64 |
| 3591 | && !again |
| 3592 | && num_huge_branches != 0 |
| 3593 | && parameters->options().output_is_position_independent()) |
| 3594 | { |
| 3595 | // Fill in the BRLT relocs. |
| 3596 | this->brlt_section_->reset_brlt_sizes(); |
| 3597 | for (typename Branch_lookup_table::const_iterator p |
| 3598 | = this->branch_lookup_table_.begin(); |
| 3599 | p != this->branch_lookup_table_.end(); |
| 3600 | ++p) |
| 3601 | { |
| 3602 | this->brlt_section_->add_reloc(p->first, p->second); |
| 3603 | } |
| 3604 | this->brlt_section_->finalize_brlt_sizes(); |
| 3605 | } |
| 3606 | |
| 3607 | if (!again |
| 3608 | && (parameters->options().user_set_emit_stub_syms() |
| 3609 | ? parameters->options().emit_stub_syms() |
| 3610 | : (size == 64 |
| 3611 | || parameters->options().output_is_position_independent() |
| 3612 | || parameters->options().emit_relocs()))) |
| 3613 | { |
| 3614 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 3615 | p != this->stub_tables_.end(); |
| 3616 | ++p) |
| 3617 | (*p)->define_stub_syms(symtab); |
| 3618 | |
| 3619 | if (this->glink_ != NULL) |
| 3620 | { |
| 3621 | int stub_size = this->glink_->pltresolve_size(); |
| 3622 | Address value = -stub_size; |
| 3623 | if (size == 64) |
| 3624 | { |
| 3625 | value = 8; |
| 3626 | stub_size -= 8; |
| 3627 | } |
| 3628 | this->define_local(symtab, "__glink_PLTresolve", |
| 3629 | this->glink_, value, stub_size); |
| 3630 | |
| 3631 | if (size != 64) |
| 3632 | this->define_local(symtab, "__glink", this->glink_, 0, 0); |
| 3633 | } |
| 3634 | } |
| 3635 | |
| 3636 | return again; |
| 3637 | } |
| 3638 | |
| 3639 | template<int size, bool big_endian> |
| 3640 | void |
| 3641 | Target_powerpc<size, big_endian>::do_plt_fde_location(const Output_data* plt, |
| 3642 | unsigned char* oview, |
| 3643 | uint64_t* paddress, |
| 3644 | off_t* plen) const |
| 3645 | { |
| 3646 | uint64_t address = plt->address(); |
| 3647 | off_t len = plt->data_size(); |
| 3648 | |
| 3649 | if (plt == this->glink_) |
| 3650 | { |
| 3651 | // See Output_data_glink::do_write() for glink contents. |
| 3652 | if (len == 0) |
| 3653 | { |
| 3654 | gold_assert(parameters->doing_static_link()); |
| 3655 | // Static linking may need stubs, to support ifunc and long |
| 3656 | // branches. We need to create an output section for |
| 3657 | // .eh_frame early in the link process, to have a place to |
| 3658 | // attach stub .eh_frame info. We also need to have |
| 3659 | // registered a CIE that matches the stub CIE. Both of |
| 3660 | // these requirements are satisfied by creating an FDE and |
| 3661 | // CIE for .glink, even though static linking will leave |
| 3662 | // .glink zero length. |
| 3663 | // ??? Hopefully generating an FDE with a zero address range |
| 3664 | // won't confuse anything that consumes .eh_frame info. |
| 3665 | } |
| 3666 | else if (size == 64) |
| 3667 | { |
| 3668 | // There is one word before __glink_PLTresolve |
| 3669 | address += 8; |
| 3670 | len -= 8; |
| 3671 | } |
| 3672 | else if (parameters->options().output_is_position_independent()) |
| 3673 | { |
| 3674 | // There are two FDEs for a position independent glink. |
| 3675 | // The first covers the branch table, the second |
| 3676 | // __glink_PLTresolve at the end of glink. |
| 3677 | off_t resolve_size = this->glink_->pltresolve_size(); |
| 3678 | if (oview[9] == elfcpp::DW_CFA_nop) |
| 3679 | len -= resolve_size; |
| 3680 | else |
| 3681 | { |
| 3682 | address += len - resolve_size; |
| 3683 | len = resolve_size; |
| 3684 | } |
| 3685 | } |
| 3686 | } |
| 3687 | else |
| 3688 | { |
| 3689 | // Must be a stub table. |
| 3690 | const Stub_table<size, big_endian>* stub_table |
| 3691 | = static_cast<const Stub_table<size, big_endian>*>(plt); |
| 3692 | uint64_t stub_address = stub_table->stub_address(); |
| 3693 | len -= stub_address - address; |
| 3694 | address = stub_address; |
| 3695 | } |
| 3696 | |
| 3697 | *paddress = address; |
| 3698 | *plen = len; |
| 3699 | } |
| 3700 | |
| 3701 | // A class to handle the PLT data. |
| 3702 | |
| 3703 | template<int size, bool big_endian> |
| 3704 | class Output_data_plt_powerpc : public Output_section_data_build |
| 3705 | { |
| 3706 | public: |
| 3707 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, |
| 3708 | size, big_endian> Reloc_section; |
| 3709 | |
| 3710 | Output_data_plt_powerpc(Target_powerpc<size, big_endian>* targ, |
| 3711 | Reloc_section* plt_rel, |
| 3712 | const char* name) |
| 3713 | : Output_section_data_build(size == 32 ? 4 : 8), |
| 3714 | rel_(plt_rel), |
| 3715 | targ_(targ), |
| 3716 | name_(name) |
| 3717 | { } |
| 3718 | |
| 3719 | // Add an entry to the PLT. |
| 3720 | void |
| 3721 | add_entry(Symbol*); |
| 3722 | |
| 3723 | void |
| 3724 | add_ifunc_entry(Symbol*); |
| 3725 | |
| 3726 | void |
| 3727 | add_local_entry(Sized_relobj_file<size, big_endian>*, unsigned int); |
| 3728 | |
| 3729 | void |
| 3730 | add_local_ifunc_entry(Sized_relobj_file<size, big_endian>*, unsigned int); |
| 3731 | |
| 3732 | // Return the .rela.plt section data. |
| 3733 | Reloc_section* |
| 3734 | rel_plt() const |
| 3735 | { |
| 3736 | return this->rel_; |
| 3737 | } |
| 3738 | |
| 3739 | // Return the number of PLT entries. |
| 3740 | unsigned int |
| 3741 | entry_count() const |
| 3742 | { |
| 3743 | if (this->current_data_size() == 0) |
| 3744 | return 0; |
| 3745 | return ((this->current_data_size() - this->first_plt_entry_offset()) |
| 3746 | / this->plt_entry_size()); |
| 3747 | } |
| 3748 | |
| 3749 | protected: |
| 3750 | void |
| 3751 | do_adjust_output_section(Output_section* os) |
| 3752 | { |
| 3753 | os->set_entsize(0); |
| 3754 | } |
| 3755 | |
| 3756 | // Write to a map file. |
| 3757 | void |
| 3758 | do_print_to_mapfile(Mapfile* mapfile) const |
| 3759 | { mapfile->print_output_data(this, this->name_); } |
| 3760 | |
| 3761 | private: |
| 3762 | // Return the offset of the first non-reserved PLT entry. |
| 3763 | unsigned int |
| 3764 | first_plt_entry_offset() const |
| 3765 | { |
| 3766 | // IPLT and LPLT have no reserved entry. |
| 3767 | if (this->name_[3] == 'I' || this->name_[3] == 'L') |
| 3768 | return 0; |
| 3769 | return this->targ_->first_plt_entry_offset(); |
| 3770 | } |
| 3771 | |
| 3772 | // Return the size of each PLT entry. |
| 3773 | unsigned int |
| 3774 | plt_entry_size() const |
| 3775 | { |
| 3776 | return this->targ_->plt_entry_size(); |
| 3777 | } |
| 3778 | |
| 3779 | // Write out the PLT data. |
| 3780 | void |
| 3781 | do_write(Output_file*); |
| 3782 | |
| 3783 | // The reloc section. |
| 3784 | Reloc_section* rel_; |
| 3785 | // Allows access to .glink for do_write. |
| 3786 | Target_powerpc<size, big_endian>* targ_; |
| 3787 | // What to report in map file. |
| 3788 | const char *name_; |
| 3789 | }; |
| 3790 | |
| 3791 | // Add an entry to the PLT. |
| 3792 | |
| 3793 | template<int size, bool big_endian> |
| 3794 | void |
| 3795 | Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym) |
| 3796 | { |
| 3797 | if (!gsym->has_plt_offset()) |
| 3798 | { |
| 3799 | section_size_type off = this->current_data_size(); |
| 3800 | if (off == 0) |
| 3801 | off += this->first_plt_entry_offset(); |
| 3802 | gsym->set_plt_offset(off); |
| 3803 | gsym->set_needs_dynsym_entry(); |
| 3804 | unsigned int dynrel = elfcpp::R_POWERPC_JMP_SLOT; |
| 3805 | this->rel_->add_global(gsym, dynrel, this, off, 0); |
| 3806 | off += this->plt_entry_size(); |
| 3807 | this->set_current_data_size(off); |
| 3808 | } |
| 3809 | } |
| 3810 | |
| 3811 | // Add an entry for a global ifunc symbol that resolves locally, to the IPLT. |
| 3812 | |
| 3813 | template<int size, bool big_endian> |
| 3814 | void |
| 3815 | Output_data_plt_powerpc<size, big_endian>::add_ifunc_entry(Symbol* gsym) |
| 3816 | { |
| 3817 | if (!gsym->has_plt_offset()) |
| 3818 | { |
| 3819 | section_size_type off = this->current_data_size(); |
| 3820 | gsym->set_plt_offset(off); |
| 3821 | unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| 3822 | if (size == 64 && this->targ_->abiversion() < 2) |
| 3823 | dynrel = elfcpp::R_PPC64_JMP_IREL; |
| 3824 | this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0); |
| 3825 | off += this->plt_entry_size(); |
| 3826 | this->set_current_data_size(off); |
| 3827 | } |
| 3828 | } |
| 3829 | |
| 3830 | // Add an entry for a local symbol to the PLT. |
| 3831 | |
| 3832 | template<int size, bool big_endian> |
| 3833 | void |
| 3834 | Output_data_plt_powerpc<size, big_endian>::add_local_entry( |
| 3835 | Sized_relobj_file<size, big_endian>* relobj, |
| 3836 | unsigned int local_sym_index) |
| 3837 | { |
| 3838 | if (!relobj->local_has_plt_offset(local_sym_index)) |
| 3839 | { |
| 3840 | section_size_type off = this->current_data_size(); |
| 3841 | relobj->set_local_plt_offset(local_sym_index, off); |
| 3842 | if (this->rel_) |
| 3843 | { |
| 3844 | unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE; |
| 3845 | if (size == 64 && this->targ_->abiversion() < 2) |
| 3846 | dynrel = elfcpp::R_POWERPC_JMP_SLOT; |
| 3847 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, |
| 3848 | dynrel, this, off, 0); |
| 3849 | } |
| 3850 | off += this->plt_entry_size(); |
| 3851 | this->set_current_data_size(off); |
| 3852 | } |
| 3853 | } |
| 3854 | |
| 3855 | // Add an entry for a local ifunc symbol to the IPLT. |
| 3856 | |
| 3857 | template<int size, bool big_endian> |
| 3858 | void |
| 3859 | Output_data_plt_powerpc<size, big_endian>::add_local_ifunc_entry( |
| 3860 | Sized_relobj_file<size, big_endian>* relobj, |
| 3861 | unsigned int local_sym_index) |
| 3862 | { |
| 3863 | if (!relobj->local_has_plt_offset(local_sym_index)) |
| 3864 | { |
| 3865 | section_size_type off = this->current_data_size(); |
| 3866 | relobj->set_local_plt_offset(local_sym_index, off); |
| 3867 | unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| 3868 | if (size == 64 && this->targ_->abiversion() < 2) |
| 3869 | dynrel = elfcpp::R_PPC64_JMP_IREL; |
| 3870 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel, |
| 3871 | this, off, 0); |
| 3872 | off += this->plt_entry_size(); |
| 3873 | this->set_current_data_size(off); |
| 3874 | } |
| 3875 | } |
| 3876 | |
| 3877 | static const uint32_t add_0_11_11 = 0x7c0b5a14; |
| 3878 | static const uint32_t add_2_2_11 = 0x7c425a14; |
| 3879 | static const uint32_t add_2_2_12 = 0x7c426214; |
| 3880 | static const uint32_t add_3_3_2 = 0x7c631214; |
| 3881 | static const uint32_t add_3_3_13 = 0x7c636a14; |
| 3882 | static const uint32_t add_3_12_2 = 0x7c6c1214; |
| 3883 | static const uint32_t add_3_12_13 = 0x7c6c6a14; |
| 3884 | static const uint32_t add_11_0_11 = 0x7d605a14; |
| 3885 | static const uint32_t add_11_2_11 = 0x7d625a14; |
| 3886 | static const uint32_t add_11_11_2 = 0x7d6b1214; |
| 3887 | static const uint32_t addi_0_12 = 0x380c0000; |
| 3888 | static const uint32_t addi_2_2 = 0x38420000; |
| 3889 | static const uint32_t addi_3_3 = 0x38630000; |
| 3890 | static const uint32_t addi_11_11 = 0x396b0000; |
| 3891 | static const uint32_t addi_12_1 = 0x39810000; |
| 3892 | static const uint32_t addi_12_12 = 0x398c0000; |
| 3893 | static const uint32_t addis_0_2 = 0x3c020000; |
| 3894 | static const uint32_t addis_0_13 = 0x3c0d0000; |
| 3895 | static const uint32_t addis_2_12 = 0x3c4c0000; |
| 3896 | static const uint32_t addis_11_2 = 0x3d620000; |
| 3897 | static const uint32_t addis_11_11 = 0x3d6b0000; |
| 3898 | static const uint32_t addis_11_30 = 0x3d7e0000; |
| 3899 | static const uint32_t addis_12_1 = 0x3d810000; |
| 3900 | static const uint32_t addis_12_2 = 0x3d820000; |
| 3901 | static const uint32_t addis_12_12 = 0x3d8c0000; |
| 3902 | static const uint32_t b = 0x48000000; |
| 3903 | static const uint32_t bcl_20_31 = 0x429f0005; |
| 3904 | static const uint32_t bctr = 0x4e800420; |
| 3905 | static const uint32_t bctrl = 0x4e800421; |
| 3906 | static const uint32_t beqlr = 0x4d820020; |
| 3907 | static const uint32_t blr = 0x4e800020; |
| 3908 | static const uint32_t bnectr_p4 = 0x4ce20420; |
| 3909 | static const uint32_t cmpld_7_12_0 = 0x7fac0040; |
| 3910 | static const uint32_t cmpldi_2_0 = 0x28220000; |
| 3911 | static const uint32_t cmpdi_11_0 = 0x2c2b0000; |
| 3912 | static const uint32_t cmpwi_11_0 = 0x2c0b0000; |
| 3913 | static const uint32_t cror_15_15_15 = 0x4def7b82; |
| 3914 | static const uint32_t cror_31_31_31 = 0x4ffffb82; |
| 3915 | static const uint32_t ld_0_1 = 0xe8010000; |
| 3916 | static const uint32_t ld_0_12 = 0xe80c0000; |
| 3917 | static const uint32_t ld_2_1 = 0xe8410000; |
| 3918 | static const uint32_t ld_2_2 = 0xe8420000; |
| 3919 | static const uint32_t ld_2_11 = 0xe84b0000; |
| 3920 | static const uint32_t ld_2_12 = 0xe84c0000; |
| 3921 | static const uint32_t ld_11_1 = 0xe9610000; |
| 3922 | static const uint32_t ld_11_2 = 0xe9620000; |
| 3923 | static const uint32_t ld_11_3 = 0xe9630000; |
| 3924 | static const uint32_t ld_11_11 = 0xe96b0000; |
| 3925 | static const uint32_t ld_12_2 = 0xe9820000; |
| 3926 | static const uint32_t ld_12_3 = 0xe9830000; |
| 3927 | static const uint32_t ld_12_11 = 0xe98b0000; |
| 3928 | static const uint32_t ld_12_12 = 0xe98c0000; |
| 3929 | static const uint32_t lfd_0_1 = 0xc8010000; |
| 3930 | static const uint32_t li_0_0 = 0x38000000; |
| 3931 | static const uint32_t li_12_0 = 0x39800000; |
| 3932 | static const uint32_t lis_0 = 0x3c000000; |
| 3933 | static const uint32_t lis_2 = 0x3c400000; |
| 3934 | static const uint32_t lis_11 = 0x3d600000; |
| 3935 | static const uint32_t lis_12 = 0x3d800000; |
| 3936 | static const uint32_t lvx_0_12_0 = 0x7c0c00ce; |
| 3937 | static const uint32_t lwz_0_12 = 0x800c0000; |
| 3938 | static const uint32_t lwz_11_3 = 0x81630000; |
| 3939 | static const uint32_t lwz_11_11 = 0x816b0000; |
| 3940 | static const uint32_t lwz_11_30 = 0x817e0000; |
| 3941 | static const uint32_t lwz_12_3 = 0x81830000; |
| 3942 | static const uint32_t lwz_12_12 = 0x818c0000; |
| 3943 | static const uint32_t lwzu_0_12 = 0x840c0000; |
| 3944 | static const uint32_t mflr_0 = 0x7c0802a6; |
| 3945 | static const uint32_t mflr_11 = 0x7d6802a6; |
| 3946 | static const uint32_t mflr_12 = 0x7d8802a6; |
| 3947 | static const uint32_t mr_0_3 = 0x7c601b78; |
| 3948 | static const uint32_t mr_3_0 = 0x7c030378; |
| 3949 | static const uint32_t mtctr_0 = 0x7c0903a6; |
| 3950 | static const uint32_t mtctr_11 = 0x7d6903a6; |
| 3951 | static const uint32_t mtctr_12 = 0x7d8903a6; |
| 3952 | static const uint32_t mtlr_0 = 0x7c0803a6; |
| 3953 | static const uint32_t mtlr_11 = 0x7d6803a6; |
| 3954 | static const uint32_t mtlr_12 = 0x7d8803a6; |
| 3955 | static const uint32_t nop = 0x60000000; |
| 3956 | static const uint32_t ori_0_0_0 = 0x60000000; |
| 3957 | static const uint32_t srdi_0_0_2 = 0x7800f082; |
| 3958 | static const uint32_t std_0_1 = 0xf8010000; |
| 3959 | static const uint32_t std_0_12 = 0xf80c0000; |
| 3960 | static const uint32_t std_2_1 = 0xf8410000; |
| 3961 | static const uint32_t std_11_1 = 0xf9610000; |
| 3962 | static const uint32_t stfd_0_1 = 0xd8010000; |
| 3963 | static const uint32_t stvx_0_12_0 = 0x7c0c01ce; |
| 3964 | static const uint32_t sub_11_11_12 = 0x7d6c5850; |
| 3965 | static const uint32_t sub_12_12_11 = 0x7d8b6050; |
| 3966 | static const uint32_t xor_2_12_12 = 0x7d826278; |
| 3967 | static const uint32_t xor_11_12_12 = 0x7d8b6278; |
| 3968 | |
| 3969 | // Write out the PLT. |
| 3970 | |
| 3971 | template<int size, bool big_endian> |
| 3972 | void |
| 3973 | Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of) |
| 3974 | { |
| 3975 | if (size == 32 && (this->name_[3] != 'I' && this->name_[3] != 'L')) |
| 3976 | { |
| 3977 | const section_size_type offset = this->offset(); |
| 3978 | const section_size_type oview_size |
| 3979 | = convert_to_section_size_type(this->data_size()); |
| 3980 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 3981 | unsigned char* pov = oview; |
| 3982 | unsigned char* endpov = oview + oview_size; |
| 3983 | |
| 3984 | // The address of the .glink branch table |
| 3985 | const Output_data_glink<size, big_endian>* glink |
| 3986 | = this->targ_->glink_section(); |
| 3987 | elfcpp::Elf_types<32>::Elf_Addr branch_tab = glink->address(); |
| 3988 | |
| 3989 | while (pov < endpov) |
| 3990 | { |
| 3991 | elfcpp::Swap<32, big_endian>::writeval(pov, branch_tab); |
| 3992 | pov += 4; |
| 3993 | branch_tab += 4; |
| 3994 | } |
| 3995 | |
| 3996 | of->write_output_view(offset, oview_size, oview); |
| 3997 | } |
| 3998 | } |
| 3999 | |
| 4000 | // Create the PLT section. |
| 4001 | |
| 4002 | template<int size, bool big_endian> |
| 4003 | void |
| 4004 | Target_powerpc<size, big_endian>::make_plt_section(Symbol_table* symtab, |
| 4005 | Layout* layout) |
| 4006 | { |
| 4007 | if (this->plt_ == NULL) |
| 4008 | { |
| 4009 | if (this->got_ == NULL) |
| 4010 | this->got_section(symtab, layout); |
| 4011 | |
| 4012 | if (this->glink_ == NULL) |
| 4013 | make_glink_section(layout); |
| 4014 | |
| 4015 | // Ensure that .rela.dyn always appears before .rela.plt This is |
| 4016 | // necessary due to how, on PowerPC and some other targets, .rela.dyn |
| 4017 | // needs to include .rela.plt in its range. |
| 4018 | this->rela_dyn_section(layout); |
| 4019 | |
| 4020 | Reloc_section* plt_rel = new Reloc_section(false); |
| 4021 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 4022 | elfcpp::SHF_ALLOC, plt_rel, |
| 4023 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 4024 | this->plt_ |
| 4025 | = new Output_data_plt_powerpc<size, big_endian>(this, plt_rel, |
| 4026 | "** PLT"); |
| 4027 | layout->add_output_section_data(".plt", |
| 4028 | (size == 32 |
| 4029 | ? elfcpp::SHT_PROGBITS |
| 4030 | : elfcpp::SHT_NOBITS), |
| 4031 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 4032 | this->plt_, |
| 4033 | (size == 32 |
| 4034 | ? ORDER_SMALL_DATA |
| 4035 | : ORDER_SMALL_BSS), |
| 4036 | false); |
| 4037 | |
| 4038 | Output_section* rela_plt_os = plt_rel->output_section(); |
| 4039 | rela_plt_os->set_info_section(this->plt_->output_section()); |
| 4040 | } |
| 4041 | } |
| 4042 | |
| 4043 | // Create the IPLT section. |
| 4044 | |
| 4045 | template<int size, bool big_endian> |
| 4046 | void |
| 4047 | Target_powerpc<size, big_endian>::make_iplt_section(Symbol_table* symtab, |
| 4048 | Layout* layout) |
| 4049 | { |
| 4050 | if (this->iplt_ == NULL) |
| 4051 | { |
| 4052 | this->make_plt_section(symtab, layout); |
| 4053 | this->make_lplt_section(layout); |
| 4054 | |
| 4055 | Reloc_section* iplt_rel = new Reloc_section(false); |
| 4056 | if (this->rela_dyn_->output_section()) |
| 4057 | this->rela_dyn_->output_section()->add_output_section_data(iplt_rel); |
| 4058 | this->iplt_ |
| 4059 | = new Output_data_plt_powerpc<size, big_endian>(this, iplt_rel, |
| 4060 | "** IPLT"); |
| 4061 | if (this->plt_->output_section()) |
| 4062 | this->plt_->output_section()->add_output_section_data(this->iplt_); |
| 4063 | } |
| 4064 | } |
| 4065 | |
| 4066 | // Create the LPLT section. |
| 4067 | |
| 4068 | template<int size, bool big_endian> |
| 4069 | void |
| 4070 | Target_powerpc<size, big_endian>::make_lplt_section(Layout* layout) |
| 4071 | { |
| 4072 | if (this->lplt_ == NULL) |
| 4073 | { |
| 4074 | Reloc_section* lplt_rel = NULL; |
| 4075 | if (parameters->options().output_is_position_independent()) |
| 4076 | { |
| 4077 | lplt_rel = new Reloc_section(false); |
| 4078 | this->rela_dyn_section(layout); |
| 4079 | if (this->rela_dyn_->output_section()) |
| 4080 | this->rela_dyn_->output_section() |
| 4081 | ->add_output_section_data(lplt_rel); |
| 4082 | } |
| 4083 | this->lplt_ |
| 4084 | = new Output_data_plt_powerpc<size, big_endian>(this, lplt_rel, |
| 4085 | "** LPLT"); |
| 4086 | this->make_brlt_section(layout); |
| 4087 | if (this->brlt_section_ && this->brlt_section_->output_section()) |
| 4088 | this->brlt_section_->output_section() |
| 4089 | ->add_output_section_data(this->lplt_); |
| 4090 | else |
| 4091 | layout->add_output_section_data(".branch_lt", |
| 4092 | elfcpp::SHT_PROGBITS, |
| 4093 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 4094 | this->lplt_, |
| 4095 | ORDER_RELRO, |
| 4096 | true); |
| 4097 | } |
| 4098 | } |
| 4099 | |
| 4100 | // A section for huge long branch addresses, similar to plt section. |
| 4101 | |
| 4102 | template<int size, bool big_endian> |
| 4103 | class Output_data_brlt_powerpc : public Output_section_data_build |
| 4104 | { |
| 4105 | public: |
| 4106 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 4107 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, |
| 4108 | size, big_endian> Reloc_section; |
| 4109 | |
| 4110 | Output_data_brlt_powerpc(Target_powerpc<size, big_endian>* targ, |
| 4111 | Reloc_section* brlt_rel) |
| 4112 | : Output_section_data_build(size == 32 ? 4 : 8), |
| 4113 | rel_(brlt_rel), |
| 4114 | targ_(targ) |
| 4115 | { } |
| 4116 | |
| 4117 | void |
| 4118 | reset_brlt_sizes() |
| 4119 | { |
| 4120 | this->reset_data_size(); |
| 4121 | this->rel_->reset_data_size(); |
| 4122 | } |
| 4123 | |
| 4124 | void |
| 4125 | finalize_brlt_sizes() |
| 4126 | { |
| 4127 | this->finalize_data_size(); |
| 4128 | this->rel_->finalize_data_size(); |
| 4129 | } |
| 4130 | |
| 4131 | // Add a reloc for an entry in the BRLT. |
| 4132 | void |
| 4133 | add_reloc(Address to, unsigned int off) |
| 4134 | { this->rel_->add_relative(elfcpp::R_POWERPC_RELATIVE, this, off, to); } |
| 4135 | |
| 4136 | // Update section and reloc section size. |
| 4137 | void |
| 4138 | set_current_size(unsigned int num_branches) |
| 4139 | { |
| 4140 | this->reset_address_and_file_offset(); |
| 4141 | this->set_current_data_size(num_branches * 16); |
| 4142 | this->finalize_data_size(); |
| 4143 | Output_section* os = this->output_section(); |
| 4144 | os->set_section_offsets_need_adjustment(); |
| 4145 | if (this->rel_ != NULL) |
| 4146 | { |
| 4147 | const unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 4148 | this->rel_->reset_address_and_file_offset(); |
| 4149 | this->rel_->set_current_data_size(num_branches * reloc_size); |
| 4150 | this->rel_->finalize_data_size(); |
| 4151 | Output_section* os = this->rel_->output_section(); |
| 4152 | os->set_section_offsets_need_adjustment(); |
| 4153 | } |
| 4154 | } |
| 4155 | |
| 4156 | protected: |
| 4157 | void |
| 4158 | do_adjust_output_section(Output_section* os) |
| 4159 | { |
| 4160 | os->set_entsize(0); |
| 4161 | } |
| 4162 | |
| 4163 | // Write to a map file. |
| 4164 | void |
| 4165 | do_print_to_mapfile(Mapfile* mapfile) const |
| 4166 | { mapfile->print_output_data(this, "** BRLT"); } |
| 4167 | |
| 4168 | private: |
| 4169 | // Write out the BRLT data. |
| 4170 | void |
| 4171 | do_write(Output_file*); |
| 4172 | |
| 4173 | // The reloc section. |
| 4174 | Reloc_section* rel_; |
| 4175 | Target_powerpc<size, big_endian>* targ_; |
| 4176 | }; |
| 4177 | |
| 4178 | // Make the branch lookup table section. |
| 4179 | |
| 4180 | template<int size, bool big_endian> |
| 4181 | void |
| 4182 | Target_powerpc<size, big_endian>::make_brlt_section(Layout* layout) |
| 4183 | { |
| 4184 | if (size == 64 && this->brlt_section_ == NULL) |
| 4185 | { |
| 4186 | Reloc_section* brlt_rel = NULL; |
| 4187 | bool is_pic = parameters->options().output_is_position_independent(); |
| 4188 | if (is_pic) |
| 4189 | { |
| 4190 | // When PIC we can't fill in .branch_lt but must initialise at |
| 4191 | // runtime via dynamic relocations. |
| 4192 | this->rela_dyn_section(layout); |
| 4193 | brlt_rel = new Reloc_section(false); |
| 4194 | if (this->rela_dyn_->output_section()) |
| 4195 | this->rela_dyn_->output_section() |
| 4196 | ->add_output_section_data(brlt_rel); |
| 4197 | } |
| 4198 | this->brlt_section_ |
| 4199 | = new Output_data_brlt_powerpc<size, big_endian>(this, brlt_rel); |
| 4200 | if (this->plt_ && is_pic && this->plt_->output_section()) |
| 4201 | this->plt_->output_section() |
| 4202 | ->add_output_section_data(this->brlt_section_); |
| 4203 | else |
| 4204 | layout->add_output_section_data(".branch_lt", |
| 4205 | elfcpp::SHT_PROGBITS, |
| 4206 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 4207 | this->brlt_section_, |
| 4208 | ORDER_RELRO, |
| 4209 | true); |
| 4210 | } |
| 4211 | } |
| 4212 | |
| 4213 | // Write out .branch_lt when non-PIC. |
| 4214 | |
| 4215 | template<int size, bool big_endian> |
| 4216 | void |
| 4217 | Output_data_brlt_powerpc<size, big_endian>::do_write(Output_file* of) |
| 4218 | { |
| 4219 | if (size == 64 && !parameters->options().output_is_position_independent()) |
| 4220 | { |
| 4221 | const section_size_type offset = this->offset(); |
| 4222 | const section_size_type oview_size |
| 4223 | = convert_to_section_size_type(this->data_size()); |
| 4224 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 4225 | |
| 4226 | this->targ_->write_branch_lookup_table(oview); |
| 4227 | of->write_output_view(offset, oview_size, oview); |
| 4228 | } |
| 4229 | } |
| 4230 | |
| 4231 | static inline uint32_t |
| 4232 | l(uint32_t a) |
| 4233 | { |
| 4234 | return a & 0xffff; |
| 4235 | } |
| 4236 | |
| 4237 | static inline uint32_t |
| 4238 | hi(uint32_t a) |
| 4239 | { |
| 4240 | return l(a >> 16); |
| 4241 | } |
| 4242 | |
| 4243 | static inline uint32_t |
| 4244 | ha(uint32_t a) |
| 4245 | { |
| 4246 | return hi(a + 0x8000); |
| 4247 | } |
| 4248 | |
| 4249 | template<int size> |
| 4250 | struct Eh_cie |
| 4251 | { |
| 4252 | static const unsigned char eh_frame_cie[12]; |
| 4253 | }; |
| 4254 | |
| 4255 | template<int size> |
| 4256 | const unsigned char Eh_cie<size>::eh_frame_cie[] = |
| 4257 | { |
| 4258 | 1, // CIE version. |
| 4259 | 'z', 'R', 0, // Augmentation string. |
| 4260 | 4, // Code alignment. |
| 4261 | 0x80 - size / 8 , // Data alignment. |
| 4262 | 65, // RA reg. |
| 4263 | 1, // Augmentation size. |
| 4264 | (elfcpp::DW_EH_PE_pcrel |
| 4265 | | elfcpp::DW_EH_PE_sdata4), // FDE encoding. |
| 4266 | elfcpp::DW_CFA_def_cfa, 1, 0 // def_cfa: r1 offset 0. |
| 4267 | }; |
| 4268 | |
| 4269 | // Describe __glink_PLTresolve use of LR, 64-bit version ABIv1. |
| 4270 | static const unsigned char glink_eh_frame_fde_64v1[] = |
| 4271 | { |
| 4272 | 0, 0, 0, 0, // Replaced with offset to .glink. |
| 4273 | 0, 0, 0, 0, // Replaced with size of .glink. |
| 4274 | 0, // Augmentation size. |
| 4275 | elfcpp::DW_CFA_advance_loc + 1, |
| 4276 | elfcpp::DW_CFA_register, 65, 12, |
| 4277 | elfcpp::DW_CFA_advance_loc + 5, |
| 4278 | elfcpp::DW_CFA_restore_extended, 65 |
| 4279 | }; |
| 4280 | |
| 4281 | // Describe __glink_PLTresolve use of LR, 64-bit version ABIv2. |
| 4282 | static const unsigned char glink_eh_frame_fde_64v2[] = |
| 4283 | { |
| 4284 | 0, 0, 0, 0, // Replaced with offset to .glink. |
| 4285 | 0, 0, 0, 0, // Replaced with size of .glink. |
| 4286 | 0, // Augmentation size. |
| 4287 | elfcpp::DW_CFA_advance_loc + 1, |
| 4288 | elfcpp::DW_CFA_register, 65, 0, |
| 4289 | elfcpp::DW_CFA_advance_loc + 7, |
| 4290 | elfcpp::DW_CFA_restore_extended, 65 |
| 4291 | }; |
| 4292 | |
| 4293 | // Describe __glink_PLTresolve use of LR, 32-bit version. |
| 4294 | static const unsigned char glink_eh_frame_fde_32[] = |
| 4295 | { |
| 4296 | 0, 0, 0, 0, // Replaced with offset to .glink. |
| 4297 | 0, 0, 0, 0, // Replaced with size of .glink. |
| 4298 | 0, // Augmentation size. |
| 4299 | elfcpp::DW_CFA_advance_loc + 2, |
| 4300 | elfcpp::DW_CFA_register, 65, 0, |
| 4301 | elfcpp::DW_CFA_advance_loc + 4, |
| 4302 | elfcpp::DW_CFA_restore_extended, 65 |
| 4303 | }; |
| 4304 | |
| 4305 | static const unsigned char default_fde[] = |
| 4306 | { |
| 4307 | 0, 0, 0, 0, // Replaced with offset to stubs. |
| 4308 | 0, 0, 0, 0, // Replaced with size of stubs. |
| 4309 | 0, // Augmentation size. |
| 4310 | elfcpp::DW_CFA_nop, // Pad. |
| 4311 | elfcpp::DW_CFA_nop, |
| 4312 | elfcpp::DW_CFA_nop |
| 4313 | }; |
| 4314 | |
| 4315 | template<bool big_endian> |
| 4316 | static inline void |
| 4317 | write_insn(unsigned char* p, uint32_t v) |
| 4318 | { |
| 4319 | elfcpp::Swap<32, big_endian>::writeval(p, v); |
| 4320 | } |
| 4321 | |
| 4322 | template<int size> |
| 4323 | static inline unsigned int |
| 4324 | param_plt_align() |
| 4325 | { |
| 4326 | if (!parameters->options().user_set_plt_align()) |
| 4327 | return size == 64 ? 32 : 8; |
| 4328 | return 1 << parameters->options().plt_align(); |
| 4329 | } |
| 4330 | |
| 4331 | // Stub_table holds information about plt and long branch stubs. |
| 4332 | // Stubs are built in an area following some input section determined |
| 4333 | // by group_sections(). This input section is converted to a relaxed |
| 4334 | // input section allowing it to be resized to accommodate the stubs |
| 4335 | |
| 4336 | template<int size, bool big_endian> |
| 4337 | class Stub_table : public Output_relaxed_input_section |
| 4338 | { |
| 4339 | public: |
| 4340 | struct Plt_stub_ent |
| 4341 | { |
| 4342 | Plt_stub_ent(unsigned int off, unsigned int indx) |
| 4343 | : off_(off), indx_(indx), r2save_(0), localentry0_(0) |
| 4344 | { } |
| 4345 | |
| 4346 | unsigned int off_; |
| 4347 | unsigned int indx_ : 30; |
| 4348 | unsigned int r2save_ : 1; |
| 4349 | unsigned int localentry0_ : 1; |
| 4350 | }; |
| 4351 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 4352 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 4353 | |
| 4354 | Stub_table(Target_powerpc<size, big_endian>* targ, |
| 4355 | Output_section* output_section, |
| 4356 | const Output_section::Input_section* owner, |
| 4357 | uint32_t id) |
| 4358 | : Output_relaxed_input_section(owner->relobj(), owner->shndx(), |
| 4359 | owner->relobj() |
| 4360 | ->section_addralign(owner->shndx())), |
| 4361 | targ_(targ), plt_call_stubs_(), long_branch_stubs_(), |
| 4362 | orig_data_size_(owner->current_data_size()), |
| 4363 | plt_size_(0), last_plt_size_(0), |
| 4364 | branch_size_(0), last_branch_size_(0), min_size_threshold_(0), |
| 4365 | need_save_res_(false), uniq_(id), tls_get_addr_opt_bctrl_(-1u), |
| 4366 | plt_fde_len_(0) |
| 4367 | { |
| 4368 | this->set_output_section(output_section); |
| 4369 | |
| 4370 | std::vector<Output_relaxed_input_section*> new_relaxed; |
| 4371 | new_relaxed.push_back(this); |
| 4372 | output_section->convert_input_sections_to_relaxed_sections(new_relaxed); |
| 4373 | } |
| 4374 | |
| 4375 | // Add a plt call stub. |
| 4376 | bool |
| 4377 | add_plt_call_entry(Address, |
| 4378 | const Sized_relobj_file<size, big_endian>*, |
| 4379 | const Symbol*, |
| 4380 | unsigned int, |
| 4381 | Address, |
| 4382 | bool); |
| 4383 | |
| 4384 | bool |
| 4385 | add_plt_call_entry(Address, |
| 4386 | const Sized_relobj_file<size, big_endian>*, |
| 4387 | unsigned int, |
| 4388 | unsigned int, |
| 4389 | Address, |
| 4390 | bool); |
| 4391 | |
| 4392 | // Find a given plt call stub. |
| 4393 | const Plt_stub_ent* |
| 4394 | find_plt_call_entry(const Symbol*) const; |
| 4395 | |
| 4396 | const Plt_stub_ent* |
| 4397 | find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, |
| 4398 | unsigned int) const; |
| 4399 | |
| 4400 | const Plt_stub_ent* |
| 4401 | find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, |
| 4402 | const Symbol*, |
| 4403 | unsigned int, |
| 4404 | Address) const; |
| 4405 | |
| 4406 | const Plt_stub_ent* |
| 4407 | find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, |
| 4408 | unsigned int, |
| 4409 | unsigned int, |
| 4410 | Address) const; |
| 4411 | |
| 4412 | // Add a long branch stub. |
| 4413 | bool |
| 4414 | add_long_branch_entry(const Powerpc_relobj<size, big_endian>*, |
| 4415 | unsigned int, Address, Address, bool); |
| 4416 | |
| 4417 | Address |
| 4418 | find_long_branch_entry(const Powerpc_relobj<size, big_endian>*, |
| 4419 | Address) const; |
| 4420 | |
| 4421 | bool |
| 4422 | can_reach_stub(Address from, unsigned int off, unsigned int r_type) |
| 4423 | { |
| 4424 | Address max_branch_offset = max_branch_delta(r_type); |
| 4425 | if (max_branch_offset == 0) |
| 4426 | return true; |
| 4427 | gold_assert(from != invalid_address); |
| 4428 | Address loc = off + this->stub_address(); |
| 4429 | return loc - from + max_branch_offset < 2 * max_branch_offset; |
| 4430 | } |
| 4431 | |
| 4432 | void |
| 4433 | clear_stubs(bool all) |
| 4434 | { |
| 4435 | this->plt_call_stubs_.clear(); |
| 4436 | this->plt_size_ = 0; |
| 4437 | this->long_branch_stubs_.clear(); |
| 4438 | this->branch_size_ = 0; |
| 4439 | this->need_save_res_ = false; |
| 4440 | if (all) |
| 4441 | { |
| 4442 | this->last_plt_size_ = 0; |
| 4443 | this->last_branch_size_ = 0; |
| 4444 | } |
| 4445 | } |
| 4446 | |
| 4447 | Address |
| 4448 | set_address_and_size(const Output_section* os, Address off) |
| 4449 | { |
| 4450 | Address start_off = off; |
| 4451 | off += this->orig_data_size_; |
| 4452 | Address my_size = this->plt_size_ + this->branch_size_; |
| 4453 | if (this->need_save_res_) |
| 4454 | my_size += this->targ_->savres_section()->data_size(); |
| 4455 | if (my_size != 0) |
| 4456 | off = align_address(off, this->stub_align()); |
| 4457 | // Include original section size and alignment padding in size |
| 4458 | my_size += off - start_off; |
| 4459 | // Ensure new size is always larger than min size |
| 4460 | // threshold. Alignment requirement is included in "my_size", so |
| 4461 | // increase "my_size" does not invalidate alignment. |
| 4462 | if (my_size < this->min_size_threshold_) |
| 4463 | my_size = this->min_size_threshold_; |
| 4464 | this->reset_address_and_file_offset(); |
| 4465 | this->set_current_data_size(my_size); |
| 4466 | this->set_address_and_file_offset(os->address() + start_off, |
| 4467 | os->offset() + start_off); |
| 4468 | return my_size; |
| 4469 | } |
| 4470 | |
| 4471 | Address |
| 4472 | stub_address() const |
| 4473 | { |
| 4474 | return align_address(this->address() + this->orig_data_size_, |
| 4475 | this->stub_align()); |
| 4476 | } |
| 4477 | |
| 4478 | Address |
| 4479 | stub_offset() const |
| 4480 | { |
| 4481 | return align_address(this->offset() + this->orig_data_size_, |
| 4482 | this->stub_align()); |
| 4483 | } |
| 4484 | |
| 4485 | section_size_type |
| 4486 | plt_size() const |
| 4487 | { return this->plt_size_; } |
| 4488 | |
| 4489 | void |
| 4490 | set_min_size_threshold(Address min_size) |
| 4491 | { this->min_size_threshold_ = min_size; } |
| 4492 | |
| 4493 | void |
| 4494 | define_stub_syms(Symbol_table*); |
| 4495 | |
| 4496 | bool |
| 4497 | size_update() |
| 4498 | { |
| 4499 | Output_section* os = this->output_section(); |
| 4500 | if (os->addralign() < this->stub_align()) |
| 4501 | { |
| 4502 | os->set_addralign(this->stub_align()); |
| 4503 | // FIXME: get rid of the insane checkpointing. |
| 4504 | // We can't increase alignment of the input section to which |
| 4505 | // stubs are attached; The input section may be .init which |
| 4506 | // is pasted together with other .init sections to form a |
| 4507 | // function. Aligning might insert zero padding resulting in |
| 4508 | // sigill. However we do need to increase alignment of the |
| 4509 | // output section so that the align_address() on offset in |
| 4510 | // set_address_and_size() adds the same padding as the |
| 4511 | // align_address() on address in stub_address(). |
| 4512 | // What's more, we need this alignment for the layout done in |
| 4513 | // relaxation_loop_body() so that the output section starts at |
| 4514 | // a suitably aligned address. |
| 4515 | os->checkpoint_set_addralign(this->stub_align()); |
| 4516 | } |
| 4517 | if (this->last_plt_size_ != this->plt_size_ |
| 4518 | || this->last_branch_size_ != this->branch_size_) |
| 4519 | { |
| 4520 | this->last_plt_size_ = this->plt_size_; |
| 4521 | this->last_branch_size_ = this->branch_size_; |
| 4522 | return true; |
| 4523 | } |
| 4524 | return false; |
| 4525 | } |
| 4526 | |
| 4527 | // Generate a suitable FDE to describe code in this stub group. |
| 4528 | void |
| 4529 | init_plt_fde(); |
| 4530 | |
| 4531 | // Add .eh_frame info for this stub section. |
| 4532 | void |
| 4533 | add_eh_frame(Layout* layout); |
| 4534 | |
| 4535 | // Remove .eh_frame info for this stub section. |
| 4536 | void |
| 4537 | remove_eh_frame(Layout* layout); |
| 4538 | |
| 4539 | Target_powerpc<size, big_endian>* |
| 4540 | targ() const |
| 4541 | { return targ_; } |
| 4542 | |
| 4543 | private: |
| 4544 | class Plt_stub_key; |
| 4545 | class Plt_stub_key_hash; |
| 4546 | typedef Unordered_map<Plt_stub_key, Plt_stub_ent, |
| 4547 | Plt_stub_key_hash> Plt_stub_entries; |
| 4548 | class Branch_stub_ent; |
| 4549 | class Branch_stub_ent_hash; |
| 4550 | typedef Unordered_map<Branch_stub_ent, unsigned int, |
| 4551 | Branch_stub_ent_hash> Branch_stub_entries; |
| 4552 | |
| 4553 | // Alignment of stub section. |
| 4554 | unsigned int |
| 4555 | stub_align() const |
| 4556 | { |
| 4557 | unsigned int min_align = size == 64 ? 32 : 16; |
| 4558 | unsigned int user_align = 1 << parameters->options().plt_align(); |
| 4559 | return std::max(user_align, min_align); |
| 4560 | } |
| 4561 | |
| 4562 | // Return the plt offset for the given call stub. |
| 4563 | Address |
| 4564 | plt_off(typename Plt_stub_entries::const_iterator p, |
| 4565 | const Output_data_plt_powerpc<size, big_endian>** sec) const |
| 4566 | { |
| 4567 | const Symbol* gsym = p->first.sym_; |
| 4568 | if (gsym != NULL) |
| 4569 | return this->targ_->plt_off(gsym, sec); |
| 4570 | else |
| 4571 | { |
| 4572 | const Sized_relobj_file<size, big_endian>* relobj = p->first.object_; |
| 4573 | unsigned int local_sym_index = p->first.locsym_; |
| 4574 | return this->targ_->plt_off(relobj, local_sym_index, sec); |
| 4575 | } |
| 4576 | } |
| 4577 | |
| 4578 | // Size of a given plt call stub. |
| 4579 | unsigned int |
| 4580 | plt_call_size(typename Plt_stub_entries::const_iterator p) const |
| 4581 | { |
| 4582 | if (size == 32) |
| 4583 | { |
| 4584 | const Symbol* gsym = p->first.sym_; |
| 4585 | return (4 * 4 |
| 4586 | + (this->targ_->is_tls_get_addr_opt(gsym) ? 8 * 4 : 0)); |
| 4587 | } |
| 4588 | |
| 4589 | const Output_data_plt_powerpc<size, big_endian>* plt; |
| 4590 | Address plt_addr = this->plt_off(p, &plt); |
| 4591 | plt_addr += plt->address(); |
| 4592 | Address got_addr = this->targ_->got_section()->output_section()->address(); |
| 4593 | const Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 4594 | <const Powerpc_relobj<size, big_endian>*>(p->first.object_); |
| 4595 | got_addr += ppcobj->toc_base_offset(); |
| 4596 | Address off = plt_addr - got_addr; |
| 4597 | unsigned int bytes = 4 * 4 + 4 * (ha(off) != 0); |
| 4598 | const Symbol* gsym = p->first.sym_; |
| 4599 | if (this->targ_->is_tls_get_addr_opt(gsym)) |
| 4600 | bytes += 13 * 4; |
| 4601 | if (this->targ_->abiversion() < 2) |
| 4602 | { |
| 4603 | bool static_chain = parameters->options().plt_static_chain(); |
| 4604 | bool thread_safe = this->targ_->plt_thread_safe(); |
| 4605 | bytes += (4 |
| 4606 | + 4 * static_chain |
| 4607 | + 8 * thread_safe |
| 4608 | + 4 * (ha(off + 8 + 8 * static_chain) != ha(off))); |
| 4609 | } |
| 4610 | return bytes; |
| 4611 | } |
| 4612 | |
| 4613 | unsigned int |
| 4614 | plt_call_align(unsigned int bytes) const |
| 4615 | { |
| 4616 | unsigned int align = param_plt_align<size>(); |
| 4617 | return (bytes + align - 1) & -align; |
| 4618 | } |
| 4619 | |
| 4620 | // Return long branch stub size. |
| 4621 | unsigned int |
| 4622 | branch_stub_size(typename Branch_stub_entries::const_iterator p) |
| 4623 | { |
| 4624 | Address loc = this->stub_address() + this->last_plt_size_ + p->second; |
| 4625 | if (p->first.dest_ - loc + (1 << 25) < 2 << 25) |
| 4626 | return 4; |
| 4627 | unsigned int bytes = 16; |
| 4628 | if (size == 32 && parameters->options().output_is_position_independent()) |
| 4629 | bytes += 16; |
| 4630 | return bytes; |
| 4631 | } |
| 4632 | |
| 4633 | // Write out stubs. |
| 4634 | void |
| 4635 | do_write(Output_file*); |
| 4636 | |
| 4637 | // Plt call stub keys. |
| 4638 | class Plt_stub_key |
| 4639 | { |
| 4640 | public: |
| 4641 | Plt_stub_key(const Symbol* sym) |
| 4642 | : sym_(sym), object_(0), addend_(0), locsym_(0) |
| 4643 | { } |
| 4644 | |
| 4645 | Plt_stub_key(const Sized_relobj_file<size, big_endian>* object, |
| 4646 | unsigned int locsym_index) |
| 4647 | : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) |
| 4648 | { } |
| 4649 | |
| 4650 | Plt_stub_key(const Sized_relobj_file<size, big_endian>* object, |
| 4651 | const Symbol* sym, |
| 4652 | unsigned int r_type, |
| 4653 | Address addend) |
| 4654 | : sym_(sym), object_(0), addend_(0), locsym_(0) |
| 4655 | { |
| 4656 | if (size != 32) |
| 4657 | this->addend_ = addend; |
| 4658 | else if (parameters->options().output_is_position_independent() |
| 4659 | && (r_type == elfcpp::R_PPC_PLTREL24 |
| 4660 | || r_type == elfcpp::R_POWERPC_PLTCALL)) |
| 4661 | { |
| 4662 | this->addend_ = addend; |
| 4663 | if (this->addend_ >= 32768) |
| 4664 | this->object_ = object; |
| 4665 | } |
| 4666 | } |
| 4667 | |
| 4668 | Plt_stub_key(const Sized_relobj_file<size, big_endian>* object, |
| 4669 | unsigned int locsym_index, |
| 4670 | unsigned int r_type, |
| 4671 | Address addend) |
| 4672 | : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) |
| 4673 | { |
| 4674 | if (size != 32) |
| 4675 | this->addend_ = addend; |
| 4676 | else if (parameters->options().output_is_position_independent() |
| 4677 | && (r_type == elfcpp::R_PPC_PLTREL24 |
| 4678 | || r_type == elfcpp::R_POWERPC_PLTCALL)) |
| 4679 | this->addend_ = addend; |
| 4680 | } |
| 4681 | |
| 4682 | bool operator==(const Plt_stub_key& that) const |
| 4683 | { |
| 4684 | return (this->sym_ == that.sym_ |
| 4685 | && this->object_ == that.object_ |
| 4686 | && this->addend_ == that.addend_ |
| 4687 | && this->locsym_ == that.locsym_); |
| 4688 | } |
| 4689 | |
| 4690 | const Symbol* sym_; |
| 4691 | const Sized_relobj_file<size, big_endian>* object_; |
| 4692 | typename elfcpp::Elf_types<size>::Elf_Addr addend_; |
| 4693 | unsigned int locsym_; |
| 4694 | }; |
| 4695 | |
| 4696 | class Plt_stub_key_hash |
| 4697 | { |
| 4698 | public: |
| 4699 | size_t operator()(const Plt_stub_key& ent) const |
| 4700 | { |
| 4701 | return (reinterpret_cast<uintptr_t>(ent.sym_) |
| 4702 | ^ reinterpret_cast<uintptr_t>(ent.object_) |
| 4703 | ^ ent.addend_ |
| 4704 | ^ ent.locsym_); |
| 4705 | } |
| 4706 | }; |
| 4707 | |
| 4708 | // Long branch stub keys. |
| 4709 | class Branch_stub_ent |
| 4710 | { |
| 4711 | public: |
| 4712 | Branch_stub_ent(const Powerpc_relobj<size, big_endian>* obj, |
| 4713 | Address to, bool save_res) |
| 4714 | : dest_(to), toc_base_off_(0), save_res_(save_res) |
| 4715 | { |
| 4716 | if (size == 64) |
| 4717 | toc_base_off_ = obj->toc_base_offset(); |
| 4718 | } |
| 4719 | |
| 4720 | bool operator==(const Branch_stub_ent& that) const |
| 4721 | { |
| 4722 | return (this->dest_ == that.dest_ |
| 4723 | && (size == 32 |
| 4724 | || this->toc_base_off_ == that.toc_base_off_)); |
| 4725 | } |
| 4726 | |
| 4727 | Address dest_; |
| 4728 | unsigned int toc_base_off_; |
| 4729 | bool save_res_; |
| 4730 | }; |
| 4731 | |
| 4732 | class Branch_stub_ent_hash |
| 4733 | { |
| 4734 | public: |
| 4735 | size_t operator()(const Branch_stub_ent& ent) const |
| 4736 | { return ent.dest_ ^ ent.toc_base_off_; } |
| 4737 | }; |
| 4738 | |
| 4739 | // In a sane world this would be a global. |
| 4740 | Target_powerpc<size, big_endian>* targ_; |
| 4741 | // Map sym/object/addend to stub offset. |
| 4742 | Plt_stub_entries plt_call_stubs_; |
| 4743 | // Map destination address to stub offset. |
| 4744 | Branch_stub_entries long_branch_stubs_; |
| 4745 | // size of input section |
| 4746 | section_size_type orig_data_size_; |
| 4747 | // size of stubs |
| 4748 | section_size_type plt_size_, last_plt_size_, branch_size_, last_branch_size_; |
| 4749 | // Some rare cases cause (PR/20529) fluctuation in stub table |
| 4750 | // size, which leads to an endless relax loop. This is to be fixed |
| 4751 | // by, after the first few iterations, allowing only increase of |
| 4752 | // stub table size. This variable sets the minimal possible size of |
| 4753 | // a stub table, it is zero for the first few iterations, then |
| 4754 | // increases monotonically. |
| 4755 | Address min_size_threshold_; |
| 4756 | // Set if this stub group needs a copy of out-of-line register |
| 4757 | // save/restore functions. |
| 4758 | bool need_save_res_; |
| 4759 | // Per stub table unique identifier. |
| 4760 | uint32_t uniq_; |
| 4761 | // The bctrl in the __tls_get_addr_opt stub, if present. |
| 4762 | unsigned int tls_get_addr_opt_bctrl_; |
| 4763 | // FDE unwind info for this stub group. |
| 4764 | unsigned int plt_fde_len_; |
| 4765 | unsigned char plt_fde_[20]; |
| 4766 | }; |
| 4767 | |
| 4768 | // Add a plt call stub, if we do not already have one for this |
| 4769 | // sym/object/addend combo. |
| 4770 | |
| 4771 | template<int size, bool big_endian> |
| 4772 | bool |
| 4773 | Stub_table<size, big_endian>::add_plt_call_entry( |
| 4774 | Address from, |
| 4775 | const Sized_relobj_file<size, big_endian>* object, |
| 4776 | const Symbol* gsym, |
| 4777 | unsigned int r_type, |
| 4778 | Address addend, |
| 4779 | bool tocsave) |
| 4780 | { |
| 4781 | Plt_stub_key key(object, gsym, r_type, addend); |
| 4782 | Plt_stub_ent ent(this->plt_size_, this->plt_call_stubs_.size()); |
| 4783 | std::pair<typename Plt_stub_entries::iterator, bool> p |
| 4784 | = this->plt_call_stubs_.insert(std::make_pair(key, ent)); |
| 4785 | if (p.second) |
| 4786 | { |
| 4787 | this->plt_size_ = ent.off_ + this->plt_call_size(p.first); |
| 4788 | if (size == 64 |
| 4789 | && this->targ_->is_elfv2_localentry0(gsym)) |
| 4790 | { |
| 4791 | p.first->second.localentry0_ = 1; |
| 4792 | this->targ_->set_has_localentry0(); |
| 4793 | } |
| 4794 | if (this->targ_->is_tls_get_addr_opt(gsym)) |
| 4795 | { |
| 4796 | this->targ_->set_has_tls_get_addr_opt(); |
| 4797 | this->tls_get_addr_opt_bctrl_ = this->plt_size_ - 5 * 4; |
| 4798 | } |
| 4799 | this->plt_size_ = this->plt_call_align(this->plt_size_); |
| 4800 | } |
| 4801 | if (size == 64 |
| 4802 | && !tocsave |
| 4803 | && !p.first->second.localentry0_) |
| 4804 | p.first->second.r2save_ = 1; |
| 4805 | return this->can_reach_stub(from, ent.off_, r_type); |
| 4806 | } |
| 4807 | |
| 4808 | template<int size, bool big_endian> |
| 4809 | bool |
| 4810 | Stub_table<size, big_endian>::add_plt_call_entry( |
| 4811 | Address from, |
| 4812 | const Sized_relobj_file<size, big_endian>* object, |
| 4813 | unsigned int locsym_index, |
| 4814 | unsigned int r_type, |
| 4815 | Address addend, |
| 4816 | bool tocsave) |
| 4817 | { |
| 4818 | Plt_stub_key key(object, locsym_index, r_type, addend); |
| 4819 | Plt_stub_ent ent(this->plt_size_, this->plt_call_stubs_.size()); |
| 4820 | std::pair<typename Plt_stub_entries::iterator, bool> p |
| 4821 | = this->plt_call_stubs_.insert(std::make_pair(key, ent)); |
| 4822 | if (p.second) |
| 4823 | { |
| 4824 | this->plt_size_ = ent.off_ + this->plt_call_size(p.first); |
| 4825 | this->plt_size_ = this->plt_call_align(this->plt_size_); |
| 4826 | if (size == 64 |
| 4827 | && this->targ_->is_elfv2_localentry0(object, locsym_index)) |
| 4828 | { |
| 4829 | p.first->second.localentry0_ = 1; |
| 4830 | this->targ_->set_has_localentry0(); |
| 4831 | } |
| 4832 | } |
| 4833 | if (size == 64 |
| 4834 | && !tocsave |
| 4835 | && !p.first->second.localentry0_) |
| 4836 | p.first->second.r2save_ = 1; |
| 4837 | return this->can_reach_stub(from, ent.off_, r_type); |
| 4838 | } |
| 4839 | |
| 4840 | // Find a plt call stub. |
| 4841 | |
| 4842 | template<int size, bool big_endian> |
| 4843 | const typename Stub_table<size, big_endian>::Plt_stub_ent* |
| 4844 | Stub_table<size, big_endian>::find_plt_call_entry( |
| 4845 | const Sized_relobj_file<size, big_endian>* object, |
| 4846 | const Symbol* gsym, |
| 4847 | unsigned int r_type, |
| 4848 | Address addend) const |
| 4849 | { |
| 4850 | Plt_stub_key key(object, gsym, r_type, addend); |
| 4851 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(key); |
| 4852 | if (p == this->plt_call_stubs_.end()) |
| 4853 | return NULL; |
| 4854 | return &p->second; |
| 4855 | } |
| 4856 | |
| 4857 | template<int size, bool big_endian> |
| 4858 | const typename Stub_table<size, big_endian>::Plt_stub_ent* |
| 4859 | Stub_table<size, big_endian>::find_plt_call_entry(const Symbol* gsym) const |
| 4860 | { |
| 4861 | Plt_stub_key key(gsym); |
| 4862 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(key); |
| 4863 | if (p == this->plt_call_stubs_.end()) |
| 4864 | return NULL; |
| 4865 | return &p->second; |
| 4866 | } |
| 4867 | |
| 4868 | template<int size, bool big_endian> |
| 4869 | const typename Stub_table<size, big_endian>::Plt_stub_ent* |
| 4870 | Stub_table<size, big_endian>::find_plt_call_entry( |
| 4871 | const Sized_relobj_file<size, big_endian>* object, |
| 4872 | unsigned int locsym_index, |
| 4873 | unsigned int r_type, |
| 4874 | Address addend) const |
| 4875 | { |
| 4876 | Plt_stub_key key(object, locsym_index, r_type, addend); |
| 4877 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(key); |
| 4878 | if (p == this->plt_call_stubs_.end()) |
| 4879 | return NULL; |
| 4880 | return &p->second; |
| 4881 | } |
| 4882 | |
| 4883 | template<int size, bool big_endian> |
| 4884 | const typename Stub_table<size, big_endian>::Plt_stub_ent* |
| 4885 | Stub_table<size, big_endian>::find_plt_call_entry( |
| 4886 | const Sized_relobj_file<size, big_endian>* object, |
| 4887 | unsigned int locsym_index) const |
| 4888 | { |
| 4889 | Plt_stub_key key(object, locsym_index); |
| 4890 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(key); |
| 4891 | if (p == this->plt_call_stubs_.end()) |
| 4892 | return NULL; |
| 4893 | return &p->second; |
| 4894 | } |
| 4895 | |
| 4896 | // Add a long branch stub if we don't already have one to given |
| 4897 | // destination. |
| 4898 | |
| 4899 | template<int size, bool big_endian> |
| 4900 | bool |
| 4901 | Stub_table<size, big_endian>::add_long_branch_entry( |
| 4902 | const Powerpc_relobj<size, big_endian>* object, |
| 4903 | unsigned int r_type, |
| 4904 | Address from, |
| 4905 | Address to, |
| 4906 | bool save_res) |
| 4907 | { |
| 4908 | Branch_stub_ent ent(object, to, save_res); |
| 4909 | Address off = this->branch_size_; |
| 4910 | std::pair<typename Branch_stub_entries::iterator, bool> p |
| 4911 | = this->long_branch_stubs_.insert(std::make_pair(ent, off)); |
| 4912 | if (p.second) |
| 4913 | { |
| 4914 | if (save_res) |
| 4915 | this->need_save_res_ = true; |
| 4916 | else |
| 4917 | { |
| 4918 | unsigned int stub_size = this->branch_stub_size(p.first); |
| 4919 | this->branch_size_ = off + stub_size; |
| 4920 | if (size == 64 && stub_size != 4) |
| 4921 | this->targ_->add_branch_lookup_table(to); |
| 4922 | } |
| 4923 | } |
| 4924 | return this->can_reach_stub(from, off, r_type); |
| 4925 | } |
| 4926 | |
| 4927 | // Find long branch stub offset. |
| 4928 | |
| 4929 | template<int size, bool big_endian> |
| 4930 | typename Stub_table<size, big_endian>::Address |
| 4931 | Stub_table<size, big_endian>::find_long_branch_entry( |
| 4932 | const Powerpc_relobj<size, big_endian>* object, |
| 4933 | Address to) const |
| 4934 | { |
| 4935 | Branch_stub_ent ent(object, to, false); |
| 4936 | typename Branch_stub_entries::const_iterator p |
| 4937 | = this->long_branch_stubs_.find(ent); |
| 4938 | if (p == this->long_branch_stubs_.end()) |
| 4939 | return invalid_address; |
| 4940 | if (p->first.save_res_) |
| 4941 | return to - this->targ_->savres_section()->address() + this->branch_size_; |
| 4942 | return p->second; |
| 4943 | } |
| 4944 | |
| 4945 | // Generate a suitable FDE to describe code in this stub group. |
| 4946 | // The __tls_get_addr_opt call stub needs to describe where it saves |
| 4947 | // LR, to support exceptions that might be thrown from __tls_get_addr. |
| 4948 | |
| 4949 | template<int size, bool big_endian> |
| 4950 | void |
| 4951 | Stub_table<size, big_endian>::init_plt_fde() |
| 4952 | { |
| 4953 | unsigned char* p = this->plt_fde_; |
| 4954 | // offset pcrel sdata4, size udata4, and augmentation size byte. |
| 4955 | memset (p, 0, 9); |
| 4956 | p += 9; |
| 4957 | if (this->tls_get_addr_opt_bctrl_ != -1u) |
| 4958 | { |
| 4959 | unsigned int to_bctrl = this->tls_get_addr_opt_bctrl_ / 4; |
| 4960 | if (to_bctrl < 64) |
| 4961 | *p++ = elfcpp::DW_CFA_advance_loc + to_bctrl; |
| 4962 | else if (to_bctrl < 256) |
| 4963 | { |
| 4964 | *p++ = elfcpp::DW_CFA_advance_loc1; |
| 4965 | *p++ = to_bctrl; |
| 4966 | } |
| 4967 | else if (to_bctrl < 65536) |
| 4968 | { |
| 4969 | *p++ = elfcpp::DW_CFA_advance_loc2; |
| 4970 | elfcpp::Swap<16, big_endian>::writeval(p, to_bctrl); |
| 4971 | p += 2; |
| 4972 | } |
| 4973 | else |
| 4974 | { |
| 4975 | *p++ = elfcpp::DW_CFA_advance_loc4; |
| 4976 | elfcpp::Swap<32, big_endian>::writeval(p, to_bctrl); |
| 4977 | p += 4; |
| 4978 | } |
| 4979 | *p++ = elfcpp::DW_CFA_offset_extended_sf; |
| 4980 | *p++ = 65; |
| 4981 | *p++ = -(this->targ_->stk_linker() / 8) & 0x7f; |
| 4982 | *p++ = elfcpp::DW_CFA_advance_loc + 4; |
| 4983 | *p++ = elfcpp::DW_CFA_restore_extended; |
| 4984 | *p++ = 65; |
| 4985 | } |
| 4986 | this->plt_fde_len_ = p - this->plt_fde_; |
| 4987 | } |
| 4988 | |
| 4989 | // Add .eh_frame info for this stub section. Unlike other linker |
| 4990 | // generated .eh_frame this is added late in the link, because we |
| 4991 | // only want the .eh_frame info if this particular stub section is |
| 4992 | // non-empty. |
| 4993 | |
| 4994 | template<int size, bool big_endian> |
| 4995 | void |
| 4996 | Stub_table<size, big_endian>::add_eh_frame(Layout* layout) |
| 4997 | { |
| 4998 | if (!parameters->options().ld_generated_unwind_info()) |
| 4999 | return; |
| 5000 | |
| 5001 | // Since we add stub .eh_frame info late, it must be placed |
| 5002 | // after all other linker generated .eh_frame info so that |
| 5003 | // merge mapping need not be updated for input sections. |
| 5004 | // There is no provision to use a different CIE to that used |
| 5005 | // by .glink. |
| 5006 | if (!this->targ_->has_glink()) |
| 5007 | return; |
| 5008 | |
| 5009 | if (this->plt_size_ + this->branch_size_ + this->need_save_res_ == 0) |
| 5010 | return; |
| 5011 | |
| 5012 | this->init_plt_fde(); |
| 5013 | layout->add_eh_frame_for_plt(this, |
| 5014 | Eh_cie<size>::eh_frame_cie, |
| 5015 | sizeof (Eh_cie<size>::eh_frame_cie), |
| 5016 | this->plt_fde_, this->plt_fde_len_); |
| 5017 | } |
| 5018 | |
| 5019 | template<int size, bool big_endian> |
| 5020 | void |
| 5021 | Stub_table<size, big_endian>::remove_eh_frame(Layout* layout) |
| 5022 | { |
| 5023 | if (this->plt_fde_len_ != 0) |
| 5024 | { |
| 5025 | layout->remove_eh_frame_for_plt(this, |
| 5026 | Eh_cie<size>::eh_frame_cie, |
| 5027 | sizeof (Eh_cie<size>::eh_frame_cie), |
| 5028 | this->plt_fde_, this->plt_fde_len_); |
| 5029 | this->plt_fde_len_ = 0; |
| 5030 | } |
| 5031 | } |
| 5032 | |
| 5033 | // A class to handle .glink. |
| 5034 | |
| 5035 | template<int size, bool big_endian> |
| 5036 | class Output_data_glink : public Output_section_data |
| 5037 | { |
| 5038 | public: |
| 5039 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 5040 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 5041 | |
| 5042 | Output_data_glink(Target_powerpc<size, big_endian>* targ) |
| 5043 | : Output_section_data(16), targ_(targ), global_entry_stubs_(), |
| 5044 | end_branch_table_(), ge_size_(0) |
| 5045 | { } |
| 5046 | |
| 5047 | void |
| 5048 | add_eh_frame(Layout* layout); |
| 5049 | |
| 5050 | void |
| 5051 | add_global_entry(const Symbol*); |
| 5052 | |
| 5053 | Address |
| 5054 | find_global_entry(const Symbol*) const; |
| 5055 | |
| 5056 | unsigned int |
| 5057 | global_entry_align(unsigned int off) const |
| 5058 | { |
| 5059 | unsigned int align = param_plt_align<size>(); |
| 5060 | return (off + align - 1) & -align; |
| 5061 | } |
| 5062 | |
| 5063 | unsigned int |
| 5064 | global_entry_off() const |
| 5065 | { |
| 5066 | return this->global_entry_align(this->end_branch_table_); |
| 5067 | } |
| 5068 | |
| 5069 | Address |
| 5070 | global_entry_address() const |
| 5071 | { |
| 5072 | gold_assert(this->is_data_size_valid()); |
| 5073 | return this->address() + this->global_entry_off(); |
| 5074 | } |
| 5075 | |
| 5076 | int |
| 5077 | pltresolve_size() const |
| 5078 | { |
| 5079 | if (size == 64) |
| 5080 | return (8 |
| 5081 | + (this->targ_->abiversion() < 2 ? 11 * 4 : 14 * 4)); |
| 5082 | return 16 * 4; |
| 5083 | } |
| 5084 | |
| 5085 | protected: |
| 5086 | // Write to a map file. |
| 5087 | void |
| 5088 | do_print_to_mapfile(Mapfile* mapfile) const |
| 5089 | { mapfile->print_output_data(this, _("** glink")); } |
| 5090 | |
| 5091 | private: |
| 5092 | void |
| 5093 | set_final_data_size(); |
| 5094 | |
| 5095 | // Write out .glink |
| 5096 | void |
| 5097 | do_write(Output_file*); |
| 5098 | |
| 5099 | // Allows access to .got and .plt for do_write. |
| 5100 | Target_powerpc<size, big_endian>* targ_; |
| 5101 | |
| 5102 | // Map sym to stub offset. |
| 5103 | typedef Unordered_map<const Symbol*, unsigned int> Global_entry_stub_entries; |
| 5104 | Global_entry_stub_entries global_entry_stubs_; |
| 5105 | |
| 5106 | unsigned int end_branch_table_, ge_size_; |
| 5107 | }; |
| 5108 | |
| 5109 | template<int size, bool big_endian> |
| 5110 | void |
| 5111 | Output_data_glink<size, big_endian>::add_eh_frame(Layout* layout) |
| 5112 | { |
| 5113 | if (!parameters->options().ld_generated_unwind_info()) |
| 5114 | return; |
| 5115 | |
| 5116 | if (size == 64) |
| 5117 | { |
| 5118 | if (this->targ_->abiversion() < 2) |
| 5119 | layout->add_eh_frame_for_plt(this, |
| 5120 | Eh_cie<64>::eh_frame_cie, |
| 5121 | sizeof (Eh_cie<64>::eh_frame_cie), |
| 5122 | glink_eh_frame_fde_64v1, |
| 5123 | sizeof (glink_eh_frame_fde_64v1)); |
| 5124 | else |
| 5125 | layout->add_eh_frame_for_plt(this, |
| 5126 | Eh_cie<64>::eh_frame_cie, |
| 5127 | sizeof (Eh_cie<64>::eh_frame_cie), |
| 5128 | glink_eh_frame_fde_64v2, |
| 5129 | sizeof (glink_eh_frame_fde_64v2)); |
| 5130 | } |
| 5131 | else |
| 5132 | { |
| 5133 | // 32-bit .glink can use the default since the CIE return |
| 5134 | // address reg, LR, is valid. |
| 5135 | layout->add_eh_frame_for_plt(this, |
| 5136 | Eh_cie<32>::eh_frame_cie, |
| 5137 | sizeof (Eh_cie<32>::eh_frame_cie), |
| 5138 | default_fde, |
| 5139 | sizeof (default_fde)); |
| 5140 | // Except where LR is used in a PIC __glink_PLTresolve. |
| 5141 | if (parameters->options().output_is_position_independent()) |
| 5142 | layout->add_eh_frame_for_plt(this, |
| 5143 | Eh_cie<32>::eh_frame_cie, |
| 5144 | sizeof (Eh_cie<32>::eh_frame_cie), |
| 5145 | glink_eh_frame_fde_32, |
| 5146 | sizeof (glink_eh_frame_fde_32)); |
| 5147 | } |
| 5148 | } |
| 5149 | |
| 5150 | template<int size, bool big_endian> |
| 5151 | void |
| 5152 | Output_data_glink<size, big_endian>::add_global_entry(const Symbol* gsym) |
| 5153 | { |
| 5154 | unsigned int off = this->global_entry_align(this->ge_size_); |
| 5155 | std::pair<typename Global_entry_stub_entries::iterator, bool> p |
| 5156 | = this->global_entry_stubs_.insert(std::make_pair(gsym, off)); |
| 5157 | if (p.second) |
| 5158 | this->ge_size_ = off + 16; |
| 5159 | } |
| 5160 | |
| 5161 | template<int size, bool big_endian> |
| 5162 | typename Output_data_glink<size, big_endian>::Address |
| 5163 | Output_data_glink<size, big_endian>::find_global_entry(const Symbol* gsym) const |
| 5164 | { |
| 5165 | typename Global_entry_stub_entries::const_iterator p |
| 5166 | = this->global_entry_stubs_.find(gsym); |
| 5167 | return p == this->global_entry_stubs_.end() ? invalid_address : p->second; |
| 5168 | } |
| 5169 | |
| 5170 | template<int size, bool big_endian> |
| 5171 | void |
| 5172 | Output_data_glink<size, big_endian>::set_final_data_size() |
| 5173 | { |
| 5174 | unsigned int count = this->targ_->plt_entry_count(); |
| 5175 | section_size_type total = 0; |
| 5176 | |
| 5177 | if (count != 0) |
| 5178 | { |
| 5179 | if (size == 32) |
| 5180 | { |
| 5181 | // space for branch table |
| 5182 | total += 4 * (count - 1); |
| 5183 | |
| 5184 | total += -total & 15; |
| 5185 | total += this->pltresolve_size(); |
| 5186 | } |
| 5187 | else |
| 5188 | { |
| 5189 | total += this->pltresolve_size(); |
| 5190 | |
| 5191 | // space for branch table |
| 5192 | total += 4 * count; |
| 5193 | if (this->targ_->abiversion() < 2) |
| 5194 | { |
| 5195 | total += 4 * count; |
| 5196 | if (count > 0x8000) |
| 5197 | total += 4 * (count - 0x8000); |
| 5198 | } |
| 5199 | } |
| 5200 | } |
| 5201 | this->end_branch_table_ = total; |
| 5202 | total = this->global_entry_align(total); |
| 5203 | total += this->ge_size_; |
| 5204 | |
| 5205 | this->set_data_size(total); |
| 5206 | } |
| 5207 | |
| 5208 | // Define symbols on stubs, identifying the stub. |
| 5209 | |
| 5210 | template<int size, bool big_endian> |
| 5211 | void |
| 5212 | Stub_table<size, big_endian>::define_stub_syms(Symbol_table* symtab) |
| 5213 | { |
| 5214 | if (!this->plt_call_stubs_.empty()) |
| 5215 | { |
| 5216 | // The key for the plt call stub hash table includes addresses, |
| 5217 | // therefore traversal order depends on those addresses, which |
| 5218 | // can change between runs if gold is a PIE. Unfortunately the |
| 5219 | // output .symtab ordering depends on the order in which symbols |
| 5220 | // are added to the linker symtab. We want reproducible output |
| 5221 | // so must sort the call stub symbols. |
| 5222 | typedef typename Plt_stub_entries::const_iterator plt_iter; |
| 5223 | std::vector<plt_iter> sorted; |
| 5224 | sorted.resize(this->plt_call_stubs_.size()); |
| 5225 | |
| 5226 | for (plt_iter cs = this->plt_call_stubs_.begin(); |
| 5227 | cs != this->plt_call_stubs_.end(); |
| 5228 | ++cs) |
| 5229 | sorted[cs->second.indx_] = cs; |
| 5230 | |
| 5231 | for (unsigned int i = 0; i < this->plt_call_stubs_.size(); ++i) |
| 5232 | { |
| 5233 | plt_iter cs = sorted[i]; |
| 5234 | char add[10]; |
| 5235 | add[0] = 0; |
| 5236 | if (cs->first.addend_ != 0) |
| 5237 | sprintf(add, "+%x", static_cast<uint32_t>(cs->first.addend_)); |
| 5238 | char obj[10]; |
| 5239 | obj[0] = 0; |
| 5240 | if (cs->first.object_) |
| 5241 | { |
| 5242 | const Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 5243 | <const Powerpc_relobj<size, big_endian>*>(cs->first.object_); |
| 5244 | sprintf(obj, "%x:", ppcobj->uniq()); |
| 5245 | } |
| 5246 | char localname[9]; |
| 5247 | const char *symname; |
| 5248 | if (cs->first.sym_ == NULL) |
| 5249 | { |
| 5250 | sprintf(localname, "%x", cs->first.locsym_); |
| 5251 | symname = localname; |
| 5252 | } |
| 5253 | else if (this->targ_->is_tls_get_addr_opt(cs->first.sym_)) |
| 5254 | symname = this->targ_->tls_get_addr_opt()->name(); |
| 5255 | else |
| 5256 | symname = cs->first.sym_->name(); |
| 5257 | char* name = new char[8 + 10 + strlen(obj) + strlen(symname) + strlen(add) + 1]; |
| 5258 | sprintf(name, "%08x.plt_call.%s%s%s", this->uniq_, obj, symname, add); |
| 5259 | Address value |
| 5260 | = this->stub_address() - this->address() + cs->second.off_; |
| 5261 | unsigned int stub_size = this->plt_call_align(this->plt_call_size(cs)); |
| 5262 | this->targ_->define_local(symtab, name, this, value, stub_size); |
| 5263 | } |
| 5264 | } |
| 5265 | |
| 5266 | typedef typename Branch_stub_entries::const_iterator branch_iter; |
| 5267 | for (branch_iter bs = this->long_branch_stubs_.begin(); |
| 5268 | bs != this->long_branch_stubs_.end(); |
| 5269 | ++bs) |
| 5270 | { |
| 5271 | if (bs->first.save_res_) |
| 5272 | continue; |
| 5273 | |
| 5274 | char* name = new char[8 + 13 + 16 + 1]; |
| 5275 | sprintf(name, "%08x.long_branch.%llx", this->uniq_, |
| 5276 | static_cast<unsigned long long>(bs->first.dest_)); |
| 5277 | Address value = (this->stub_address() - this->address() |
| 5278 | + this->plt_size_ + bs->second); |
| 5279 | unsigned int stub_size = this->branch_stub_size(bs); |
| 5280 | this->targ_->define_local(symtab, name, this, value, stub_size); |
| 5281 | } |
| 5282 | } |
| 5283 | |
| 5284 | // Write out plt and long branch stub code. |
| 5285 | |
| 5286 | template<int size, bool big_endian> |
| 5287 | void |
| 5288 | Stub_table<size, big_endian>::do_write(Output_file* of) |
| 5289 | { |
| 5290 | if (this->plt_call_stubs_.empty() |
| 5291 | && this->long_branch_stubs_.empty()) |
| 5292 | return; |
| 5293 | |
| 5294 | const section_size_type start_off = this->offset(); |
| 5295 | const section_size_type off = this->stub_offset(); |
| 5296 | const section_size_type oview_size = |
| 5297 | convert_to_section_size_type(this->data_size() - (off - start_off)); |
| 5298 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 5299 | unsigned char* p; |
| 5300 | |
| 5301 | if (size == 64) |
| 5302 | { |
| 5303 | const Output_data_got_powerpc<size, big_endian>* got |
| 5304 | = this->targ_->got_section(); |
| 5305 | Address got_os_addr = got->output_section()->address(); |
| 5306 | |
| 5307 | if (!this->plt_call_stubs_.empty()) |
| 5308 | { |
| 5309 | // Write out plt call stubs. |
| 5310 | typename Plt_stub_entries::const_iterator cs; |
| 5311 | for (cs = this->plt_call_stubs_.begin(); |
| 5312 | cs != this->plt_call_stubs_.end(); |
| 5313 | ++cs) |
| 5314 | { |
| 5315 | const Output_data_plt_powerpc<size, big_endian>* plt; |
| 5316 | Address pltoff = this->plt_off(cs, &plt); |
| 5317 | Address plt_addr = pltoff + plt->address(); |
| 5318 | const Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 5319 | <const Powerpc_relobj<size, big_endian>*>(cs->first.object_); |
| 5320 | Address got_addr = got_os_addr + ppcobj->toc_base_offset(); |
| 5321 | Address off = plt_addr - got_addr; |
| 5322 | |
| 5323 | if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) |
| 5324 | gold_error(_("%s: linkage table error against `%s'"), |
| 5325 | cs->first.object_->name().c_str(), |
| 5326 | cs->first.sym_->demangled_name().c_str()); |
| 5327 | |
| 5328 | bool plt_load_toc = this->targ_->abiversion() < 2; |
| 5329 | bool static_chain |
| 5330 | = plt_load_toc && parameters->options().plt_static_chain(); |
| 5331 | bool thread_safe |
| 5332 | = plt_load_toc && this->targ_->plt_thread_safe(); |
| 5333 | bool use_fake_dep = false; |
| 5334 | Address cmp_branch_off = 0; |
| 5335 | if (thread_safe) |
| 5336 | { |
| 5337 | unsigned int pltindex |
| 5338 | = ((pltoff - this->targ_->first_plt_entry_offset()) |
| 5339 | / this->targ_->plt_entry_size()); |
| 5340 | Address glinkoff |
| 5341 | = (this->targ_->glink_section()->pltresolve_size() |
| 5342 | + pltindex * 8); |
| 5343 | if (pltindex > 32768) |
| 5344 | glinkoff += (pltindex - 32768) * 4; |
| 5345 | Address to |
| 5346 | = this->targ_->glink_section()->address() + glinkoff; |
| 5347 | Address from |
| 5348 | = (this->stub_address() + cs->second.off_ + 20 |
| 5349 | + 4 * cs->second.r2save_ |
| 5350 | + 4 * (ha(off) != 0) |
| 5351 | + 4 * (ha(off + 8 + 8 * static_chain) != ha(off)) |
| 5352 | + 4 * static_chain); |
| 5353 | cmp_branch_off = to - from; |
| 5354 | use_fake_dep = cmp_branch_off + (1 << 25) >= (1 << 26); |
| 5355 | } |
| 5356 | |
| 5357 | p = oview + cs->second.off_; |
| 5358 | const Symbol* gsym = cs->first.sym_; |
| 5359 | if (this->targ_->is_tls_get_addr_opt(gsym)) |
| 5360 | { |
| 5361 | write_insn<big_endian>(p, ld_11_3 + 0); |
| 5362 | p += 4; |
| 5363 | write_insn<big_endian>(p, ld_12_3 + 8); |
| 5364 | p += 4; |
| 5365 | write_insn<big_endian>(p, mr_0_3); |
| 5366 | p += 4; |
| 5367 | write_insn<big_endian>(p, cmpdi_11_0); |
| 5368 | p += 4; |
| 5369 | write_insn<big_endian>(p, add_3_12_13); |
| 5370 | p += 4; |
| 5371 | write_insn<big_endian>(p, beqlr); |
| 5372 | p += 4; |
| 5373 | write_insn<big_endian>(p, mr_3_0); |
| 5374 | p += 4; |
| 5375 | if (!cs->second.localentry0_) |
| 5376 | { |
| 5377 | write_insn<big_endian>(p, mflr_11); |
| 5378 | p += 4; |
| 5379 | write_insn<big_endian>(p, (std_11_1 |
| 5380 | + this->targ_->stk_linker())); |
| 5381 | p += 4; |
| 5382 | } |
| 5383 | use_fake_dep = thread_safe; |
| 5384 | } |
| 5385 | if (ha(off) != 0) |
| 5386 | { |
| 5387 | if (cs->second.r2save_) |
| 5388 | { |
| 5389 | write_insn<big_endian>(p, |
| 5390 | std_2_1 + this->targ_->stk_toc()); |
| 5391 | p += 4; |
| 5392 | } |
| 5393 | if (plt_load_toc) |
| 5394 | { |
| 5395 | write_insn<big_endian>(p, addis_11_2 + ha(off)); |
| 5396 | p += 4; |
| 5397 | write_insn<big_endian>(p, ld_12_11 + l(off)); |
| 5398 | p += 4; |
| 5399 | } |
| 5400 | else |
| 5401 | { |
| 5402 | write_insn<big_endian>(p, addis_12_2 + ha(off)); |
| 5403 | p += 4; |
| 5404 | write_insn<big_endian>(p, ld_12_12 + l(off)); |
| 5405 | p += 4; |
| 5406 | } |
| 5407 | if (plt_load_toc |
| 5408 | && ha(off + 8 + 8 * static_chain) != ha(off)) |
| 5409 | { |
| 5410 | write_insn<big_endian>(p, addi_11_11 + l(off)); |
| 5411 | p += 4; |
| 5412 | off = 0; |
| 5413 | } |
| 5414 | write_insn<big_endian>(p, mtctr_12); |
| 5415 | p += 4; |
| 5416 | if (plt_load_toc) |
| 5417 | { |
| 5418 | if (use_fake_dep) |
| 5419 | { |
| 5420 | write_insn<big_endian>(p, xor_2_12_12); |
| 5421 | p += 4; |
| 5422 | write_insn<big_endian>(p, add_11_11_2); |
| 5423 | p += 4; |
| 5424 | } |
| 5425 | write_insn<big_endian>(p, ld_2_11 + l(off + 8)); |
| 5426 | p += 4; |
| 5427 | if (static_chain) |
| 5428 | { |
| 5429 | write_insn<big_endian>(p, ld_11_11 + l(off + 16)); |
| 5430 | p += 4; |
| 5431 | } |
| 5432 | } |
| 5433 | } |
| 5434 | else |
| 5435 | { |
| 5436 | if (cs->second.r2save_) |
| 5437 | { |
| 5438 | write_insn<big_endian>(p, |
| 5439 | std_2_1 + this->targ_->stk_toc()); |
| 5440 | p += 4; |
| 5441 | } |
| 5442 | write_insn<big_endian>(p, ld_12_2 + l(off)); |
| 5443 | p += 4; |
| 5444 | if (plt_load_toc |
| 5445 | && ha(off + 8 + 8 * static_chain) != ha(off)) |
| 5446 | { |
| 5447 | write_insn<big_endian>(p, addi_2_2 + l(off)); |
| 5448 | p += 4; |
| 5449 | off = 0; |
| 5450 | } |
| 5451 | write_insn<big_endian>(p, mtctr_12); |
| 5452 | p += 4; |
| 5453 | if (plt_load_toc) |
| 5454 | { |
| 5455 | if (use_fake_dep) |
| 5456 | { |
| 5457 | write_insn<big_endian>(p, xor_11_12_12); |
| 5458 | p += 4; |
| 5459 | write_insn<big_endian>(p, add_2_2_11); |
| 5460 | p += 4; |
| 5461 | } |
| 5462 | if (static_chain) |
| 5463 | { |
| 5464 | write_insn<big_endian>(p, ld_11_2 + l(off + 16)); |
| 5465 | p += 4; |
| 5466 | } |
| 5467 | write_insn<big_endian>(p, ld_2_2 + l(off + 8)); |
| 5468 | p += 4; |
| 5469 | } |
| 5470 | } |
| 5471 | if (!cs->second.localentry0_ |
| 5472 | && this->targ_->is_tls_get_addr_opt(gsym)) |
| 5473 | { |
| 5474 | write_insn<big_endian>(p, bctrl); |
| 5475 | p += 4; |
| 5476 | write_insn<big_endian>(p, ld_2_1 + this->targ_->stk_toc()); |
| 5477 | p += 4; |
| 5478 | write_insn<big_endian>(p, ld_11_1 + this->targ_->stk_linker()); |
| 5479 | p += 4; |
| 5480 | write_insn<big_endian>(p, mtlr_11); |
| 5481 | p += 4; |
| 5482 | write_insn<big_endian>(p, blr); |
| 5483 | } |
| 5484 | else if (thread_safe && !use_fake_dep) |
| 5485 | { |
| 5486 | write_insn<big_endian>(p, cmpldi_2_0); |
| 5487 | p += 4; |
| 5488 | write_insn<big_endian>(p, bnectr_p4); |
| 5489 | p += 4; |
| 5490 | write_insn<big_endian>(p, b | (cmp_branch_off & 0x3fffffc)); |
| 5491 | } |
| 5492 | else |
| 5493 | write_insn<big_endian>(p, bctr); |
| 5494 | } |
| 5495 | } |
| 5496 | |
| 5497 | // Write out long branch stubs. |
| 5498 | typename Branch_stub_entries::const_iterator bs; |
| 5499 | for (bs = this->long_branch_stubs_.begin(); |
| 5500 | bs != this->long_branch_stubs_.end(); |
| 5501 | ++bs) |
| 5502 | { |
| 5503 | if (bs->first.save_res_) |
| 5504 | continue; |
| 5505 | p = oview + this->plt_size_ + bs->second; |
| 5506 | Address loc = this->stub_address() + this->plt_size_ + bs->second; |
| 5507 | Address delta = bs->first.dest_ - loc; |
| 5508 | if (delta + (1 << 25) < 2 << 25) |
| 5509 | write_insn<big_endian>(p, b | (delta & 0x3fffffc)); |
| 5510 | else |
| 5511 | { |
| 5512 | Address brlt_addr |
| 5513 | = this->targ_->find_branch_lookup_table(bs->first.dest_); |
| 5514 | gold_assert(brlt_addr != invalid_address); |
| 5515 | brlt_addr += this->targ_->brlt_section()->address(); |
| 5516 | Address got_addr = got_os_addr + bs->first.toc_base_off_; |
| 5517 | Address brltoff = brlt_addr - got_addr; |
| 5518 | if (ha(brltoff) == 0) |
| 5519 | { |
| 5520 | write_insn<big_endian>(p, ld_12_2 + l(brltoff)), p += 4; |
| 5521 | } |
| 5522 | else |
| 5523 | { |
| 5524 | write_insn<big_endian>(p, addis_12_2 + ha(brltoff)), p += 4; |
| 5525 | write_insn<big_endian>(p, ld_12_12 + l(brltoff)), p += 4; |
| 5526 | } |
| 5527 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 5528 | write_insn<big_endian>(p, bctr); |
| 5529 | } |
| 5530 | } |
| 5531 | } |
| 5532 | else |
| 5533 | { |
| 5534 | if (!this->plt_call_stubs_.empty()) |
| 5535 | { |
| 5536 | // The address of _GLOBAL_OFFSET_TABLE_. |
| 5537 | Address g_o_t = invalid_address; |
| 5538 | |
| 5539 | // Write out plt call stubs. |
| 5540 | typename Plt_stub_entries::const_iterator cs; |
| 5541 | for (cs = this->plt_call_stubs_.begin(); |
| 5542 | cs != this->plt_call_stubs_.end(); |
| 5543 | ++cs) |
| 5544 | { |
| 5545 | const Output_data_plt_powerpc<size, big_endian>* plt; |
| 5546 | Address plt_addr = this->plt_off(cs, &plt); |
| 5547 | plt_addr += plt->address(); |
| 5548 | |
| 5549 | p = oview + cs->second.off_; |
| 5550 | const Symbol* gsym = cs->first.sym_; |
| 5551 | if (this->targ_->is_tls_get_addr_opt(gsym)) |
| 5552 | { |
| 5553 | write_insn<big_endian>(p, lwz_11_3 + 0); |
| 5554 | p += 4; |
| 5555 | write_insn<big_endian>(p, lwz_12_3 + 4); |
| 5556 | p += 4; |
| 5557 | write_insn<big_endian>(p, mr_0_3); |
| 5558 | p += 4; |
| 5559 | write_insn<big_endian>(p, cmpwi_11_0); |
| 5560 | p += 4; |
| 5561 | write_insn<big_endian>(p, add_3_12_2); |
| 5562 | p += 4; |
| 5563 | write_insn<big_endian>(p, beqlr); |
| 5564 | p += 4; |
| 5565 | write_insn<big_endian>(p, mr_3_0); |
| 5566 | p += 4; |
| 5567 | write_insn<big_endian>(p, nop); |
| 5568 | p += 4; |
| 5569 | } |
| 5570 | if (parameters->options().output_is_position_independent()) |
| 5571 | { |
| 5572 | Address got_addr; |
| 5573 | const Powerpc_relobj<size, big_endian>* ppcobj |
| 5574 | = (static_cast<const Powerpc_relobj<size, big_endian>*> |
| 5575 | (cs->first.object_)); |
| 5576 | if (ppcobj != NULL && cs->first.addend_ >= 32768) |
| 5577 | { |
| 5578 | unsigned int got2 = ppcobj->got2_shndx(); |
| 5579 | got_addr = ppcobj->get_output_section_offset(got2); |
| 5580 | gold_assert(got_addr != invalid_address); |
| 5581 | got_addr += (ppcobj->output_section(got2)->address() |
| 5582 | + cs->first.addend_); |
| 5583 | } |
| 5584 | else |
| 5585 | { |
| 5586 | if (g_o_t == invalid_address) |
| 5587 | { |
| 5588 | const Output_data_got_powerpc<size, big_endian>* got |
| 5589 | = this->targ_->got_section(); |
| 5590 | g_o_t = got->address() + got->g_o_t(); |
| 5591 | } |
| 5592 | got_addr = g_o_t; |
| 5593 | } |
| 5594 | |
| 5595 | Address off = plt_addr - got_addr; |
| 5596 | if (ha(off) == 0) |
| 5597 | write_insn<big_endian>(p, lwz_11_30 + l(off)); |
| 5598 | else |
| 5599 | { |
| 5600 | write_insn<big_endian>(p, addis_11_30 + ha(off)); |
| 5601 | p += 4; |
| 5602 | write_insn<big_endian>(p, lwz_11_11 + l(off)); |
| 5603 | } |
| 5604 | } |
| 5605 | else |
| 5606 | { |
| 5607 | write_insn<big_endian>(p, lis_11 + ha(plt_addr)); |
| 5608 | p += 4; |
| 5609 | write_insn<big_endian>(p, lwz_11_11 + l(plt_addr)); |
| 5610 | } |
| 5611 | p += 4; |
| 5612 | write_insn<big_endian>(p, mtctr_11); |
| 5613 | p += 4; |
| 5614 | write_insn<big_endian>(p, bctr); |
| 5615 | } |
| 5616 | } |
| 5617 | |
| 5618 | // Write out long branch stubs. |
| 5619 | typename Branch_stub_entries::const_iterator bs; |
| 5620 | for (bs = this->long_branch_stubs_.begin(); |
| 5621 | bs != this->long_branch_stubs_.end(); |
| 5622 | ++bs) |
| 5623 | { |
| 5624 | if (bs->first.save_res_) |
| 5625 | continue; |
| 5626 | p = oview + this->plt_size_ + bs->second; |
| 5627 | Address loc = this->stub_address() + this->plt_size_ + bs->second; |
| 5628 | Address delta = bs->first.dest_ - loc; |
| 5629 | if (delta + (1 << 25) < 2 << 25) |
| 5630 | write_insn<big_endian>(p, b | (delta & 0x3fffffc)); |
| 5631 | else if (!parameters->options().output_is_position_independent()) |
| 5632 | { |
| 5633 | write_insn<big_endian>(p, lis_12 + ha(bs->first.dest_)); |
| 5634 | p += 4; |
| 5635 | write_insn<big_endian>(p, addi_12_12 + l(bs->first.dest_)); |
| 5636 | } |
| 5637 | else |
| 5638 | { |
| 5639 | delta -= 8; |
| 5640 | write_insn<big_endian>(p, mflr_0); |
| 5641 | p += 4; |
| 5642 | write_insn<big_endian>(p, bcl_20_31); |
| 5643 | p += 4; |
| 5644 | write_insn<big_endian>(p, mflr_12); |
| 5645 | p += 4; |
| 5646 | write_insn<big_endian>(p, addis_12_12 + ha(delta)); |
| 5647 | p += 4; |
| 5648 | write_insn<big_endian>(p, addi_12_12 + l(delta)); |
| 5649 | p += 4; |
| 5650 | write_insn<big_endian>(p, mtlr_0); |
| 5651 | } |
| 5652 | p += 4; |
| 5653 | write_insn<big_endian>(p, mtctr_12); |
| 5654 | p += 4; |
| 5655 | write_insn<big_endian>(p, bctr); |
| 5656 | } |
| 5657 | } |
| 5658 | if (this->need_save_res_) |
| 5659 | { |
| 5660 | p = oview + this->plt_size_ + this->branch_size_; |
| 5661 | memcpy (p, this->targ_->savres_section()->contents(), |
| 5662 | this->targ_->savres_section()->data_size()); |
| 5663 | } |
| 5664 | } |
| 5665 | |
| 5666 | // Write out .glink. |
| 5667 | |
| 5668 | template<int size, bool big_endian> |
| 5669 | void |
| 5670 | Output_data_glink<size, big_endian>::do_write(Output_file* of) |
| 5671 | { |
| 5672 | const section_size_type off = this->offset(); |
| 5673 | const section_size_type oview_size = |
| 5674 | convert_to_section_size_type(this->data_size()); |
| 5675 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 5676 | unsigned char* p; |
| 5677 | |
| 5678 | // The base address of the .plt section. |
| 5679 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 5680 | Address plt_base = this->targ_->plt_section()->address(); |
| 5681 | |
| 5682 | if (size == 64) |
| 5683 | { |
| 5684 | if (this->end_branch_table_ != 0) |
| 5685 | { |
| 5686 | // Write pltresolve stub. |
| 5687 | p = oview; |
| 5688 | Address after_bcl = this->address() + 16; |
| 5689 | Address pltoff = plt_base - after_bcl; |
| 5690 | |
| 5691 | elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8; |
| 5692 | |
| 5693 | if (this->targ_->abiversion() < 2) |
| 5694 | { |
| 5695 | write_insn<big_endian>(p, mflr_12), p += 4; |
| 5696 | write_insn<big_endian>(p, bcl_20_31), p += 4; |
| 5697 | write_insn<big_endian>(p, mflr_11), p += 4; |
| 5698 | write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4; |
| 5699 | write_insn<big_endian>(p, mtlr_12), p += 4; |
| 5700 | write_insn<big_endian>(p, add_11_2_11), p += 4; |
| 5701 | write_insn<big_endian>(p, ld_12_11 + 0), p += 4; |
| 5702 | write_insn<big_endian>(p, ld_2_11 + 8), p += 4; |
| 5703 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 5704 | write_insn<big_endian>(p, ld_11_11 + 16), p += 4; |
| 5705 | } |
| 5706 | else |
| 5707 | { |
| 5708 | write_insn<big_endian>(p, mflr_0), p += 4; |
| 5709 | write_insn<big_endian>(p, bcl_20_31), p += 4; |
| 5710 | write_insn<big_endian>(p, mflr_11), p += 4; |
| 5711 | write_insn<big_endian>(p, std_2_1 + 24), p += 4; |
| 5712 | write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4; |
| 5713 | write_insn<big_endian>(p, mtlr_0), p += 4; |
| 5714 | write_insn<big_endian>(p, sub_12_12_11), p += 4; |
| 5715 | write_insn<big_endian>(p, add_11_2_11), p += 4; |
| 5716 | write_insn<big_endian>(p, addi_0_12 + l(-48)), p += 4; |
| 5717 | write_insn<big_endian>(p, ld_12_11 + 0), p += 4; |
| 5718 | write_insn<big_endian>(p, srdi_0_0_2), p += 4; |
| 5719 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 5720 | write_insn<big_endian>(p, ld_11_11 + 8), p += 4; |
| 5721 | } |
| 5722 | write_insn<big_endian>(p, bctr), p += 4; |
| 5723 | gold_assert(p == oview + this->pltresolve_size()); |
| 5724 | |
| 5725 | // Write lazy link call stubs. |
| 5726 | uint32_t indx = 0; |
| 5727 | while (p < oview + this->end_branch_table_) |
| 5728 | { |
| 5729 | if (this->targ_->abiversion() < 2) |
| 5730 | { |
| 5731 | if (indx < 0x8000) |
| 5732 | { |
| 5733 | write_insn<big_endian>(p, li_0_0 + indx), p += 4; |
| 5734 | } |
| 5735 | else |
| 5736 | { |
| 5737 | write_insn<big_endian>(p, lis_0 + hi(indx)), p += 4; |
| 5738 | write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4; |
| 5739 | } |
| 5740 | } |
| 5741 | uint32_t branch_off = 8 - (p - oview); |
| 5742 | write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4; |
| 5743 | indx++; |
| 5744 | } |
| 5745 | } |
| 5746 | |
| 5747 | Address plt_base = this->targ_->plt_section()->address(); |
| 5748 | Address iplt_base = invalid_address; |
| 5749 | unsigned int global_entry_off = this->global_entry_off(); |
| 5750 | Address global_entry_base = this->address() + global_entry_off; |
| 5751 | typename Global_entry_stub_entries::const_iterator ge; |
| 5752 | for (ge = this->global_entry_stubs_.begin(); |
| 5753 | ge != this->global_entry_stubs_.end(); |
| 5754 | ++ge) |
| 5755 | { |
| 5756 | p = oview + global_entry_off + ge->second; |
| 5757 | Address plt_addr = ge->first->plt_offset(); |
| 5758 | if (ge->first->type() == elfcpp::STT_GNU_IFUNC |
| 5759 | && ge->first->can_use_relative_reloc(false)) |
| 5760 | { |
| 5761 | if (iplt_base == invalid_address) |
| 5762 | iplt_base = this->targ_->iplt_section()->address(); |
| 5763 | plt_addr += iplt_base; |
| 5764 | } |
| 5765 | else |
| 5766 | plt_addr += plt_base; |
| 5767 | Address my_addr = global_entry_base + ge->second; |
| 5768 | Address off = plt_addr - my_addr; |
| 5769 | |
| 5770 | if (off + 0x80008000 > 0xffffffff || (off & 3) != 0) |
| 5771 | gold_error(_("%s: linkage table error against `%s'"), |
| 5772 | ge->first->object()->name().c_str(), |
| 5773 | ge->first->demangled_name().c_str()); |
| 5774 | |
| 5775 | write_insn<big_endian>(p, addis_12_12 + ha(off)), p += 4; |
| 5776 | write_insn<big_endian>(p, ld_12_12 + l(off)), p += 4; |
| 5777 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 5778 | write_insn<big_endian>(p, bctr); |
| 5779 | } |
| 5780 | } |
| 5781 | else |
| 5782 | { |
| 5783 | const Output_data_got_powerpc<size, big_endian>* got |
| 5784 | = this->targ_->got_section(); |
| 5785 | // The address of _GLOBAL_OFFSET_TABLE_. |
| 5786 | Address g_o_t = got->address() + got->g_o_t(); |
| 5787 | |
| 5788 | // Write out pltresolve branch table. |
| 5789 | p = oview; |
| 5790 | unsigned int the_end = oview_size - this->pltresolve_size(); |
| 5791 | unsigned char* end_p = oview + the_end; |
| 5792 | while (p < end_p - 8 * 4) |
| 5793 | write_insn<big_endian>(p, b + end_p - p), p += 4; |
| 5794 | while (p < end_p) |
| 5795 | write_insn<big_endian>(p, nop), p += 4; |
| 5796 | |
| 5797 | // Write out pltresolve call stub. |
| 5798 | end_p = oview + oview_size; |
| 5799 | if (parameters->options().output_is_position_independent()) |
| 5800 | { |
| 5801 | Address res0_off = 0; |
| 5802 | Address after_bcl_off = the_end + 12; |
| 5803 | Address bcl_res0 = after_bcl_off - res0_off; |
| 5804 | |
| 5805 | write_insn<big_endian>(p, addis_11_11 + ha(bcl_res0)); |
| 5806 | p += 4; |
| 5807 | write_insn<big_endian>(p, mflr_0); |
| 5808 | p += 4; |
| 5809 | write_insn<big_endian>(p, bcl_20_31); |
| 5810 | p += 4; |
| 5811 | write_insn<big_endian>(p, addi_11_11 + l(bcl_res0)); |
| 5812 | p += 4; |
| 5813 | write_insn<big_endian>(p, mflr_12); |
| 5814 | p += 4; |
| 5815 | write_insn<big_endian>(p, mtlr_0); |
| 5816 | p += 4; |
| 5817 | write_insn<big_endian>(p, sub_11_11_12); |
| 5818 | p += 4; |
| 5819 | |
| 5820 | Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address()); |
| 5821 | |
| 5822 | write_insn<big_endian>(p, addis_12_12 + ha(got_bcl)); |
| 5823 | p += 4; |
| 5824 | if (ha(got_bcl) == ha(got_bcl + 4)) |
| 5825 | { |
| 5826 | write_insn<big_endian>(p, lwz_0_12 + l(got_bcl)); |
| 5827 | p += 4; |
| 5828 | write_insn<big_endian>(p, lwz_12_12 + l(got_bcl + 4)); |
| 5829 | } |
| 5830 | else |
| 5831 | { |
| 5832 | write_insn<big_endian>(p, lwzu_0_12 + l(got_bcl)); |
| 5833 | p += 4; |
| 5834 | write_insn<big_endian>(p, lwz_12_12 + 4); |
| 5835 | } |
| 5836 | p += 4; |
| 5837 | write_insn<big_endian>(p, mtctr_0); |
| 5838 | p += 4; |
| 5839 | write_insn<big_endian>(p, add_0_11_11); |
| 5840 | p += 4; |
| 5841 | write_insn<big_endian>(p, add_11_0_11); |
| 5842 | } |
| 5843 | else |
| 5844 | { |
| 5845 | Address res0 = this->address(); |
| 5846 | |
| 5847 | write_insn<big_endian>(p, lis_12 + ha(g_o_t + 4)); |
| 5848 | p += 4; |
| 5849 | write_insn<big_endian>(p, addis_11_11 + ha(-res0)); |
| 5850 | p += 4; |
| 5851 | if (ha(g_o_t + 4) == ha(g_o_t + 8)) |
| 5852 | write_insn<big_endian>(p, lwz_0_12 + l(g_o_t + 4)); |
| 5853 | else |
| 5854 | write_insn<big_endian>(p, lwzu_0_12 + l(g_o_t + 4)); |
| 5855 | p += 4; |
| 5856 | write_insn<big_endian>(p, addi_11_11 + l(-res0)); |
| 5857 | p += 4; |
| 5858 | write_insn<big_endian>(p, mtctr_0); |
| 5859 | p += 4; |
| 5860 | write_insn<big_endian>(p, add_0_11_11); |
| 5861 | p += 4; |
| 5862 | if (ha(g_o_t + 4) == ha(g_o_t + 8)) |
| 5863 | write_insn<big_endian>(p, lwz_12_12 + l(g_o_t + 8)); |
| 5864 | else |
| 5865 | write_insn<big_endian>(p, lwz_12_12 + 4); |
| 5866 | p += 4; |
| 5867 | write_insn<big_endian>(p, add_11_0_11); |
| 5868 | } |
| 5869 | p += 4; |
| 5870 | write_insn<big_endian>(p, bctr); |
| 5871 | p += 4; |
| 5872 | while (p < end_p) |
| 5873 | { |
| 5874 | write_insn<big_endian>(p, nop); |
| 5875 | p += 4; |
| 5876 | } |
| 5877 | } |
| 5878 | |
| 5879 | of->write_output_view(off, oview_size, oview); |
| 5880 | } |
| 5881 | |
| 5882 | |
| 5883 | // A class to handle linker generated save/restore functions. |
| 5884 | |
| 5885 | template<int size, bool big_endian> |
| 5886 | class Output_data_save_res : public Output_section_data_build |
| 5887 | { |
| 5888 | public: |
| 5889 | Output_data_save_res(Symbol_table* symtab); |
| 5890 | |
| 5891 | const unsigned char* |
| 5892 | contents() const |
| 5893 | { |
| 5894 | return contents_; |
| 5895 | } |
| 5896 | |
| 5897 | protected: |
| 5898 | // Write to a map file. |
| 5899 | void |
| 5900 | do_print_to_mapfile(Mapfile* mapfile) const |
| 5901 | { mapfile->print_output_data(this, _("** save/restore")); } |
| 5902 | |
| 5903 | void |
| 5904 | do_write(Output_file*); |
| 5905 | |
| 5906 | private: |
| 5907 | // The maximum size of save/restore contents. |
| 5908 | static const unsigned int savres_max = 218*4; |
| 5909 | |
| 5910 | void |
| 5911 | savres_define(Symbol_table* symtab, |
| 5912 | const char *name, |
| 5913 | unsigned int lo, unsigned int hi, |
| 5914 | unsigned char* write_ent(unsigned char*, int), |
| 5915 | unsigned char* write_tail(unsigned char*, int)); |
| 5916 | |
| 5917 | unsigned char *contents_; |
| 5918 | }; |
| 5919 | |
| 5920 | template<bool big_endian> |
| 5921 | static unsigned char* |
| 5922 | savegpr0(unsigned char* p, int r) |
| 5923 | { |
| 5924 | uint32_t insn = std_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 5925 | write_insn<big_endian>(p, insn); |
| 5926 | return p + 4; |
| 5927 | } |
| 5928 | |
| 5929 | template<bool big_endian> |
| 5930 | static unsigned char* |
| 5931 | savegpr0_tail(unsigned char* p, int r) |
| 5932 | { |
| 5933 | p = savegpr0<big_endian>(p, r); |
| 5934 | uint32_t insn = std_0_1 + 16; |
| 5935 | write_insn<big_endian>(p, insn); |
| 5936 | p = p + 4; |
| 5937 | write_insn<big_endian>(p, blr); |
| 5938 | return p + 4; |
| 5939 | } |
| 5940 | |
| 5941 | template<bool big_endian> |
| 5942 | static unsigned char* |
| 5943 | restgpr0(unsigned char* p, int r) |
| 5944 | { |
| 5945 | uint32_t insn = ld_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 5946 | write_insn<big_endian>(p, insn); |
| 5947 | return p + 4; |
| 5948 | } |
| 5949 | |
| 5950 | template<bool big_endian> |
| 5951 | static unsigned char* |
| 5952 | restgpr0_tail(unsigned char* p, int r) |
| 5953 | { |
| 5954 | uint32_t insn = ld_0_1 + 16; |
| 5955 | write_insn<big_endian>(p, insn); |
| 5956 | p = p + 4; |
| 5957 | p = restgpr0<big_endian>(p, r); |
| 5958 | write_insn<big_endian>(p, mtlr_0); |
| 5959 | p = p + 4; |
| 5960 | if (r == 29) |
| 5961 | { |
| 5962 | p = restgpr0<big_endian>(p, 30); |
| 5963 | p = restgpr0<big_endian>(p, 31); |
| 5964 | } |
| 5965 | write_insn<big_endian>(p, blr); |
| 5966 | return p + 4; |
| 5967 | } |
| 5968 | |
| 5969 | template<bool big_endian> |
| 5970 | static unsigned char* |
| 5971 | savegpr1(unsigned char* p, int r) |
| 5972 | { |
| 5973 | uint32_t insn = std_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 5974 | write_insn<big_endian>(p, insn); |
| 5975 | return p + 4; |
| 5976 | } |
| 5977 | |
| 5978 | template<bool big_endian> |
| 5979 | static unsigned char* |
| 5980 | savegpr1_tail(unsigned char* p, int r) |
| 5981 | { |
| 5982 | p = savegpr1<big_endian>(p, r); |
| 5983 | write_insn<big_endian>(p, blr); |
| 5984 | return p + 4; |
| 5985 | } |
| 5986 | |
| 5987 | template<bool big_endian> |
| 5988 | static unsigned char* |
| 5989 | restgpr1(unsigned char* p, int r) |
| 5990 | { |
| 5991 | uint32_t insn = ld_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 5992 | write_insn<big_endian>(p, insn); |
| 5993 | return p + 4; |
| 5994 | } |
| 5995 | |
| 5996 | template<bool big_endian> |
| 5997 | static unsigned char* |
| 5998 | restgpr1_tail(unsigned char* p, int r) |
| 5999 | { |
| 6000 | p = restgpr1<big_endian>(p, r); |
| 6001 | write_insn<big_endian>(p, blr); |
| 6002 | return p + 4; |
| 6003 | } |
| 6004 | |
| 6005 | template<bool big_endian> |
| 6006 | static unsigned char* |
| 6007 | savefpr(unsigned char* p, int r) |
| 6008 | { |
| 6009 | uint32_t insn = stfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 6010 | write_insn<big_endian>(p, insn); |
| 6011 | return p + 4; |
| 6012 | } |
| 6013 | |
| 6014 | template<bool big_endian> |
| 6015 | static unsigned char* |
| 6016 | savefpr0_tail(unsigned char* p, int r) |
| 6017 | { |
| 6018 | p = savefpr<big_endian>(p, r); |
| 6019 | write_insn<big_endian>(p, std_0_1 + 16); |
| 6020 | p = p + 4; |
| 6021 | write_insn<big_endian>(p, blr); |
| 6022 | return p + 4; |
| 6023 | } |
| 6024 | |
| 6025 | template<bool big_endian> |
| 6026 | static unsigned char* |
| 6027 | restfpr(unsigned char* p, int r) |
| 6028 | { |
| 6029 | uint32_t insn = lfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 6030 | write_insn<big_endian>(p, insn); |
| 6031 | return p + 4; |
| 6032 | } |
| 6033 | |
| 6034 | template<bool big_endian> |
| 6035 | static unsigned char* |
| 6036 | restfpr0_tail(unsigned char* p, int r) |
| 6037 | { |
| 6038 | write_insn<big_endian>(p, ld_0_1 + 16); |
| 6039 | p = p + 4; |
| 6040 | p = restfpr<big_endian>(p, r); |
| 6041 | write_insn<big_endian>(p, mtlr_0); |
| 6042 | p = p + 4; |
| 6043 | if (r == 29) |
| 6044 | { |
| 6045 | p = restfpr<big_endian>(p, 30); |
| 6046 | p = restfpr<big_endian>(p, 31); |
| 6047 | } |
| 6048 | write_insn<big_endian>(p, blr); |
| 6049 | return p + 4; |
| 6050 | } |
| 6051 | |
| 6052 | template<bool big_endian> |
| 6053 | static unsigned char* |
| 6054 | savefpr1_tail(unsigned char* p, int r) |
| 6055 | { |
| 6056 | p = savefpr<big_endian>(p, r); |
| 6057 | write_insn<big_endian>(p, blr); |
| 6058 | return p + 4; |
| 6059 | } |
| 6060 | |
| 6061 | template<bool big_endian> |
| 6062 | static unsigned char* |
| 6063 | restfpr1_tail(unsigned char* p, int r) |
| 6064 | { |
| 6065 | p = restfpr<big_endian>(p, r); |
| 6066 | write_insn<big_endian>(p, blr); |
| 6067 | return p + 4; |
| 6068 | } |
| 6069 | |
| 6070 | template<bool big_endian> |
| 6071 | static unsigned char* |
| 6072 | savevr(unsigned char* p, int r) |
| 6073 | { |
| 6074 | uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; |
| 6075 | write_insn<big_endian>(p, insn); |
| 6076 | p = p + 4; |
| 6077 | insn = stvx_0_12_0 + (r << 21); |
| 6078 | write_insn<big_endian>(p, insn); |
| 6079 | return p + 4; |
| 6080 | } |
| 6081 | |
| 6082 | template<bool big_endian> |
| 6083 | static unsigned char* |
| 6084 | savevr_tail(unsigned char* p, int r) |
| 6085 | { |
| 6086 | p = savevr<big_endian>(p, r); |
| 6087 | write_insn<big_endian>(p, blr); |
| 6088 | return p + 4; |
| 6089 | } |
| 6090 | |
| 6091 | template<bool big_endian> |
| 6092 | static unsigned char* |
| 6093 | restvr(unsigned char* p, int r) |
| 6094 | { |
| 6095 | uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; |
| 6096 | write_insn<big_endian>(p, insn); |
| 6097 | p = p + 4; |
| 6098 | insn = lvx_0_12_0 + (r << 21); |
| 6099 | write_insn<big_endian>(p, insn); |
| 6100 | return p + 4; |
| 6101 | } |
| 6102 | |
| 6103 | template<bool big_endian> |
| 6104 | static unsigned char* |
| 6105 | restvr_tail(unsigned char* p, int r) |
| 6106 | { |
| 6107 | p = restvr<big_endian>(p, r); |
| 6108 | write_insn<big_endian>(p, blr); |
| 6109 | return p + 4; |
| 6110 | } |
| 6111 | |
| 6112 | |
| 6113 | template<int size, bool big_endian> |
| 6114 | Output_data_save_res<size, big_endian>::Output_data_save_res( |
| 6115 | Symbol_table* symtab) |
| 6116 | : Output_section_data_build(4), |
| 6117 | contents_(NULL) |
| 6118 | { |
| 6119 | this->savres_define(symtab, |
| 6120 | "_savegpr0_", 14, 31, |
| 6121 | savegpr0<big_endian>, savegpr0_tail<big_endian>); |
| 6122 | this->savres_define(symtab, |
| 6123 | "_restgpr0_", 14, 29, |
| 6124 | restgpr0<big_endian>, restgpr0_tail<big_endian>); |
| 6125 | this->savres_define(symtab, |
| 6126 | "_restgpr0_", 30, 31, |
| 6127 | restgpr0<big_endian>, restgpr0_tail<big_endian>); |
| 6128 | this->savres_define(symtab, |
| 6129 | "_savegpr1_", 14, 31, |
| 6130 | savegpr1<big_endian>, savegpr1_tail<big_endian>); |
| 6131 | this->savres_define(symtab, |
| 6132 | "_restgpr1_", 14, 31, |
| 6133 | restgpr1<big_endian>, restgpr1_tail<big_endian>); |
| 6134 | this->savres_define(symtab, |
| 6135 | "_savefpr_", 14, 31, |
| 6136 | savefpr<big_endian>, savefpr0_tail<big_endian>); |
| 6137 | this->savres_define(symtab, |
| 6138 | "_restfpr_", 14, 29, |
| 6139 | restfpr<big_endian>, restfpr0_tail<big_endian>); |
| 6140 | this->savres_define(symtab, |
| 6141 | "_restfpr_", 30, 31, |
| 6142 | restfpr<big_endian>, restfpr0_tail<big_endian>); |
| 6143 | this->savres_define(symtab, |
| 6144 | "._savef", 14, 31, |
| 6145 | savefpr<big_endian>, savefpr1_tail<big_endian>); |
| 6146 | this->savres_define(symtab, |
| 6147 | "._restf", 14, 31, |
| 6148 | restfpr<big_endian>, restfpr1_tail<big_endian>); |
| 6149 | this->savres_define(symtab, |
| 6150 | "_savevr_", 20, 31, |
| 6151 | savevr<big_endian>, savevr_tail<big_endian>); |
| 6152 | this->savres_define(symtab, |
| 6153 | "_restvr_", 20, 31, |
| 6154 | restvr<big_endian>, restvr_tail<big_endian>); |
| 6155 | } |
| 6156 | |
| 6157 | template<int size, bool big_endian> |
| 6158 | void |
| 6159 | Output_data_save_res<size, big_endian>::savres_define( |
| 6160 | Symbol_table* symtab, |
| 6161 | const char *name, |
| 6162 | unsigned int lo, unsigned int hi, |
| 6163 | unsigned char* write_ent(unsigned char*, int), |
| 6164 | unsigned char* write_tail(unsigned char*, int)) |
| 6165 | { |
| 6166 | size_t len = strlen(name); |
| 6167 | bool writing = false; |
| 6168 | char sym[16]; |
| 6169 | |
| 6170 | memcpy(sym, name, len); |
| 6171 | sym[len + 2] = 0; |
| 6172 | |
| 6173 | for (unsigned int i = lo; i <= hi; i++) |
| 6174 | { |
| 6175 | sym[len + 0] = i / 10 + '0'; |
| 6176 | sym[len + 1] = i % 10 + '0'; |
| 6177 | Symbol* gsym = symtab->lookup(sym); |
| 6178 | bool refd = gsym != NULL && gsym->is_undefined(); |
| 6179 | writing = writing || refd; |
| 6180 | if (writing) |
| 6181 | { |
| 6182 | if (this->contents_ == NULL) |
| 6183 | this->contents_ = new unsigned char[this->savres_max]; |
| 6184 | |
| 6185 | section_size_type value = this->current_data_size(); |
| 6186 | unsigned char* p = this->contents_ + value; |
| 6187 | if (i != hi) |
| 6188 | p = write_ent(p, i); |
| 6189 | else |
| 6190 | p = write_tail(p, i); |
| 6191 | section_size_type cur_size = p - this->contents_; |
| 6192 | this->set_current_data_size(cur_size); |
| 6193 | if (refd) |
| 6194 | symtab->define_in_output_data(sym, NULL, Symbol_table::PREDEFINED, |
| 6195 | this, value, cur_size - value, |
| 6196 | elfcpp::STT_FUNC, elfcpp::STB_GLOBAL, |
| 6197 | elfcpp::STV_HIDDEN, 0, false, false); |
| 6198 | } |
| 6199 | } |
| 6200 | } |
| 6201 | |
| 6202 | // Write out save/restore. |
| 6203 | |
| 6204 | template<int size, bool big_endian> |
| 6205 | void |
| 6206 | Output_data_save_res<size, big_endian>::do_write(Output_file* of) |
| 6207 | { |
| 6208 | const section_size_type off = this->offset(); |
| 6209 | const section_size_type oview_size = |
| 6210 | convert_to_section_size_type(this->data_size()); |
| 6211 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 6212 | memcpy(oview, this->contents_, oview_size); |
| 6213 | of->write_output_view(off, oview_size, oview); |
| 6214 | } |
| 6215 | |
| 6216 | |
| 6217 | // Create the glink section. |
| 6218 | |
| 6219 | template<int size, bool big_endian> |
| 6220 | void |
| 6221 | Target_powerpc<size, big_endian>::make_glink_section(Layout* layout) |
| 6222 | { |
| 6223 | if (this->glink_ == NULL) |
| 6224 | { |
| 6225 | this->glink_ = new Output_data_glink<size, big_endian>(this); |
| 6226 | this->glink_->add_eh_frame(layout); |
| 6227 | layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, |
| 6228 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, |
| 6229 | this->glink_, ORDER_TEXT, false); |
| 6230 | } |
| 6231 | } |
| 6232 | |
| 6233 | // Create a PLT entry for a global symbol. |
| 6234 | |
| 6235 | template<int size, bool big_endian> |
| 6236 | void |
| 6237 | Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab, |
| 6238 | Layout* layout, |
| 6239 | Symbol* gsym) |
| 6240 | { |
| 6241 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 6242 | && gsym->can_use_relative_reloc(false)) |
| 6243 | { |
| 6244 | if (this->iplt_ == NULL) |
| 6245 | this->make_iplt_section(symtab, layout); |
| 6246 | this->iplt_->add_ifunc_entry(gsym); |
| 6247 | } |
| 6248 | else |
| 6249 | { |
| 6250 | if (this->plt_ == NULL) |
| 6251 | this->make_plt_section(symtab, layout); |
| 6252 | this->plt_->add_entry(gsym); |
| 6253 | } |
| 6254 | } |
| 6255 | |
| 6256 | // Make a PLT entry for a local symbol. |
| 6257 | |
| 6258 | template<int size, bool big_endian> |
| 6259 | void |
| 6260 | Target_powerpc<size, big_endian>::make_local_plt_entry( |
| 6261 | Layout* layout, |
| 6262 | Sized_relobj_file<size, big_endian>* relobj, |
| 6263 | unsigned int r_sym) |
| 6264 | { |
| 6265 | if (this->lplt_ == NULL) |
| 6266 | this->make_lplt_section(layout); |
| 6267 | this->lplt_->add_local_entry(relobj, r_sym); |
| 6268 | } |
| 6269 | |
| 6270 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
| 6271 | |
| 6272 | template<int size, bool big_endian> |
| 6273 | void |
| 6274 | Target_powerpc<size, big_endian>::make_local_ifunc_plt_entry( |
| 6275 | Symbol_table* symtab, |
| 6276 | Layout* layout, |
| 6277 | Sized_relobj_file<size, big_endian>* relobj, |
| 6278 | unsigned int r_sym) |
| 6279 | { |
| 6280 | if (this->iplt_ == NULL) |
| 6281 | this->make_iplt_section(symtab, layout); |
| 6282 | this->iplt_->add_local_ifunc_entry(relobj, r_sym); |
| 6283 | } |
| 6284 | |
| 6285 | // Return the number of entries in the PLT. |
| 6286 | |
| 6287 | template<int size, bool big_endian> |
| 6288 | unsigned int |
| 6289 | Target_powerpc<size, big_endian>::plt_entry_count() const |
| 6290 | { |
| 6291 | if (this->plt_ == NULL) |
| 6292 | return 0; |
| 6293 | return this->plt_->entry_count(); |
| 6294 | } |
| 6295 | |
| 6296 | // Create a GOT entry for local dynamic __tls_get_addr calls. |
| 6297 | |
| 6298 | template<int size, bool big_endian> |
| 6299 | unsigned int |
| 6300 | Target_powerpc<size, big_endian>::tlsld_got_offset( |
| 6301 | Symbol_table* symtab, |
| 6302 | Layout* layout, |
| 6303 | Sized_relobj_file<size, big_endian>* object) |
| 6304 | { |
| 6305 | if (this->tlsld_got_offset_ == -1U) |
| 6306 | { |
| 6307 | gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| 6308 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| 6309 | Output_data_got_powerpc<size, big_endian>* got |
| 6310 | = this->got_section(symtab, layout); |
| 6311 | unsigned int got_offset = got->add_constant_pair(0, 0); |
| 6312 | rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got, |
| 6313 | got_offset, 0); |
| 6314 | this->tlsld_got_offset_ = got_offset; |
| 6315 | } |
| 6316 | return this->tlsld_got_offset_; |
| 6317 | } |
| 6318 | |
| 6319 | // Get the Reference_flags for a particular relocation. |
| 6320 | |
| 6321 | template<int size, bool big_endian> |
| 6322 | int |
| 6323 | Target_powerpc<size, big_endian>::Scan::get_reference_flags( |
| 6324 | unsigned int r_type, |
| 6325 | const Target_powerpc* target) |
| 6326 | { |
| 6327 | int ref = 0; |
| 6328 | |
| 6329 | switch (r_type) |
| 6330 | { |
| 6331 | case elfcpp::R_POWERPC_NONE: |
| 6332 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 6333 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 6334 | case elfcpp::R_PPC64_TOC: |
| 6335 | // No symbol reference. |
| 6336 | break; |
| 6337 | |
| 6338 | case elfcpp::R_PPC64_ADDR64: |
| 6339 | case elfcpp::R_PPC64_UADDR64: |
| 6340 | case elfcpp::R_POWERPC_ADDR32: |
| 6341 | case elfcpp::R_POWERPC_UADDR32: |
| 6342 | case elfcpp::R_POWERPC_ADDR16: |
| 6343 | case elfcpp::R_POWERPC_UADDR16: |
| 6344 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 6345 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 6346 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 6347 | ref = Symbol::ABSOLUTE_REF; |
| 6348 | break; |
| 6349 | |
| 6350 | case elfcpp::R_POWERPC_ADDR24: |
| 6351 | case elfcpp::R_POWERPC_ADDR14: |
| 6352 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 6353 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 6354 | ref = Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; |
| 6355 | break; |
| 6356 | |
| 6357 | case elfcpp::R_PPC64_REL64: |
| 6358 | case elfcpp::R_POWERPC_REL32: |
| 6359 | case elfcpp::R_PPC_LOCAL24PC: |
| 6360 | case elfcpp::R_POWERPC_REL16: |
| 6361 | case elfcpp::R_POWERPC_REL16_LO: |
| 6362 | case elfcpp::R_POWERPC_REL16_HI: |
| 6363 | case elfcpp::R_POWERPC_REL16_HA: |
| 6364 | ref = Symbol::RELATIVE_REF; |
| 6365 | break; |
| 6366 | |
| 6367 | case elfcpp::R_POWERPC_REL24: |
| 6368 | case elfcpp::R_PPC_PLTREL24: |
| 6369 | case elfcpp::R_POWERPC_REL14: |
| 6370 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 6371 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 6372 | ref = Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; |
| 6373 | break; |
| 6374 | |
| 6375 | case elfcpp::R_POWERPC_GOT16: |
| 6376 | case elfcpp::R_POWERPC_GOT16_LO: |
| 6377 | case elfcpp::R_POWERPC_GOT16_HI: |
| 6378 | case elfcpp::R_POWERPC_GOT16_HA: |
| 6379 | case elfcpp::R_PPC64_GOT16_DS: |
| 6380 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 6381 | case elfcpp::R_PPC64_TOC16: |
| 6382 | case elfcpp::R_PPC64_TOC16_LO: |
| 6383 | case elfcpp::R_PPC64_TOC16_HI: |
| 6384 | case elfcpp::R_PPC64_TOC16_HA: |
| 6385 | case elfcpp::R_PPC64_TOC16_DS: |
| 6386 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 6387 | case elfcpp::R_POWERPC_PLT16_LO: |
| 6388 | case elfcpp::R_POWERPC_PLT16_HI: |
| 6389 | case elfcpp::R_POWERPC_PLT16_HA: |
| 6390 | case elfcpp::R_PPC64_PLT16_LO_DS: |
| 6391 | ref = Symbol::RELATIVE_REF; |
| 6392 | break; |
| 6393 | |
| 6394 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 6395 | case elfcpp::R_POWERPC_TLS: |
| 6396 | ref = Symbol::TLS_REF; |
| 6397 | break; |
| 6398 | |
| 6399 | case elfcpp::R_POWERPC_COPY: |
| 6400 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 6401 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 6402 | case elfcpp::R_POWERPC_RELATIVE: |
| 6403 | case elfcpp::R_POWERPC_DTPMOD: |
| 6404 | default: |
| 6405 | // Not expected. We will give an error later. |
| 6406 | break; |
| 6407 | } |
| 6408 | |
| 6409 | if (size == 64 && target->abiversion() < 2) |
| 6410 | ref |= Symbol::FUNC_DESC_ABI; |
| 6411 | return ref; |
| 6412 | } |
| 6413 | |
| 6414 | // Report an unsupported relocation against a local symbol. |
| 6415 | |
| 6416 | template<int size, bool big_endian> |
| 6417 | void |
| 6418 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local( |
| 6419 | Sized_relobj_file<size, big_endian>* object, |
| 6420 | unsigned int r_type) |
| 6421 | { |
| 6422 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 6423 | object->name().c_str(), r_type); |
| 6424 | } |
| 6425 | |
| 6426 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
| 6427 | // dynamic linker does not support it, issue an error. |
| 6428 | |
| 6429 | template<int size, bool big_endian> |
| 6430 | void |
| 6431 | Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object, |
| 6432 | unsigned int r_type) |
| 6433 | { |
| 6434 | gold_assert(r_type != elfcpp::R_POWERPC_NONE); |
| 6435 | |
| 6436 | // These are the relocation types supported by glibc for both 32-bit |
| 6437 | // and 64-bit powerpc. |
| 6438 | switch (r_type) |
| 6439 | { |
| 6440 | case elfcpp::R_POWERPC_NONE: |
| 6441 | case elfcpp::R_POWERPC_RELATIVE: |
| 6442 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 6443 | case elfcpp::R_POWERPC_DTPMOD: |
| 6444 | case elfcpp::R_POWERPC_DTPREL: |
| 6445 | case elfcpp::R_POWERPC_TPREL: |
| 6446 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 6447 | case elfcpp::R_POWERPC_COPY: |
| 6448 | case elfcpp::R_POWERPC_IRELATIVE: |
| 6449 | case elfcpp::R_POWERPC_ADDR32: |
| 6450 | case elfcpp::R_POWERPC_UADDR32: |
| 6451 | case elfcpp::R_POWERPC_ADDR24: |
| 6452 | case elfcpp::R_POWERPC_ADDR16: |
| 6453 | case elfcpp::R_POWERPC_UADDR16: |
| 6454 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 6455 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 6456 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 6457 | case elfcpp::R_POWERPC_ADDR14: |
| 6458 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 6459 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 6460 | case elfcpp::R_POWERPC_REL32: |
| 6461 | case elfcpp::R_POWERPC_REL24: |
| 6462 | case elfcpp::R_POWERPC_TPREL16: |
| 6463 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 6464 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 6465 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 6466 | return; |
| 6467 | |
| 6468 | default: |
| 6469 | break; |
| 6470 | } |
| 6471 | |
| 6472 | if (size == 64) |
| 6473 | { |
| 6474 | switch (r_type) |
| 6475 | { |
| 6476 | // These are the relocation types supported only on 64-bit. |
| 6477 | case elfcpp::R_PPC64_ADDR64: |
| 6478 | case elfcpp::R_PPC64_UADDR64: |
| 6479 | case elfcpp::R_PPC64_JMP_IREL: |
| 6480 | case elfcpp::R_PPC64_ADDR16_DS: |
| 6481 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 6482 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 6483 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 6484 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 6485 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 6486 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 6487 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 6488 | case elfcpp::R_PPC64_REL64: |
| 6489 | case elfcpp::R_POWERPC_ADDR30: |
| 6490 | case elfcpp::R_PPC64_TPREL16_DS: |
| 6491 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 6492 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 6493 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 6494 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 6495 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 6496 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 6497 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 6498 | return; |
| 6499 | |
| 6500 | default: |
| 6501 | break; |
| 6502 | } |
| 6503 | } |
| 6504 | else |
| 6505 | { |
| 6506 | switch (r_type) |
| 6507 | { |
| 6508 | // These are the relocation types supported only on 32-bit. |
| 6509 | // ??? glibc ld.so doesn't need to support these. |
| 6510 | case elfcpp::R_POWERPC_DTPREL16: |
| 6511 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 6512 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 6513 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 6514 | return; |
| 6515 | |
| 6516 | default: |
| 6517 | break; |
| 6518 | } |
| 6519 | } |
| 6520 | |
| 6521 | // This prevents us from issuing more than one error per reloc |
| 6522 | // section. But we can still wind up issuing more than one |
| 6523 | // error per object file. |
| 6524 | if (this->issued_non_pic_error_) |
| 6525 | return; |
| 6526 | gold_assert(parameters->options().output_is_position_independent()); |
| 6527 | object->error(_("requires unsupported dynamic reloc; " |
| 6528 | "recompile with -fPIC")); |
| 6529 | this->issued_non_pic_error_ = true; |
| 6530 | return; |
| 6531 | } |
| 6532 | |
| 6533 | // Return whether we need to make a PLT entry for a relocation of the |
| 6534 | // given type against a STT_GNU_IFUNC symbol. |
| 6535 | |
| 6536 | template<int size, bool big_endian> |
| 6537 | bool |
| 6538 | Target_powerpc<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( |
| 6539 | Target_powerpc<size, big_endian>* target, |
| 6540 | Sized_relobj_file<size, big_endian>* object, |
| 6541 | unsigned int r_type, |
| 6542 | bool report_err) |
| 6543 | { |
| 6544 | // In non-pic code any reference will resolve to the plt call stub |
| 6545 | // for the ifunc symbol. |
| 6546 | if ((size == 32 || target->abiversion() >= 2) |
| 6547 | && !parameters->options().output_is_position_independent()) |
| 6548 | return true; |
| 6549 | |
| 6550 | switch (r_type) |
| 6551 | { |
| 6552 | // Word size refs from data sections are OK, but don't need a PLT entry. |
| 6553 | case elfcpp::R_POWERPC_ADDR32: |
| 6554 | case elfcpp::R_POWERPC_UADDR32: |
| 6555 | if (size == 32) |
| 6556 | return false; |
| 6557 | break; |
| 6558 | |
| 6559 | case elfcpp::R_PPC64_ADDR64: |
| 6560 | case elfcpp::R_PPC64_UADDR64: |
| 6561 | if (size == 64) |
| 6562 | return false; |
| 6563 | break; |
| 6564 | |
| 6565 | // GOT refs are good, but also don't need a PLT entry. |
| 6566 | case elfcpp::R_POWERPC_GOT16: |
| 6567 | case elfcpp::R_POWERPC_GOT16_LO: |
| 6568 | case elfcpp::R_POWERPC_GOT16_HI: |
| 6569 | case elfcpp::R_POWERPC_GOT16_HA: |
| 6570 | case elfcpp::R_PPC64_GOT16_DS: |
| 6571 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 6572 | return false; |
| 6573 | |
| 6574 | // PLT relocs are OK and need a PLT entry. |
| 6575 | case elfcpp::R_POWERPC_PLT16_LO: |
| 6576 | case elfcpp::R_POWERPC_PLT16_HI: |
| 6577 | case elfcpp::R_POWERPC_PLT16_HA: |
| 6578 | case elfcpp::R_PPC64_PLT16_LO_DS: |
| 6579 | case elfcpp::R_POWERPC_PLTSEQ: |
| 6580 | case elfcpp::R_POWERPC_PLTCALL: |
| 6581 | return true; |
| 6582 | break; |
| 6583 | |
| 6584 | // Function calls are good, and these do need a PLT entry. |
| 6585 | case elfcpp::R_POWERPC_ADDR24: |
| 6586 | case elfcpp::R_POWERPC_ADDR14: |
| 6587 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 6588 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 6589 | case elfcpp::R_POWERPC_REL24: |
| 6590 | case elfcpp::R_PPC_PLTREL24: |
| 6591 | case elfcpp::R_POWERPC_REL14: |
| 6592 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 6593 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 6594 | return true; |
| 6595 | |
| 6596 | default: |
| 6597 | break; |
| 6598 | } |
| 6599 | |
| 6600 | // Anything else is a problem. |
| 6601 | // If we are building a static executable, the libc startup function |
| 6602 | // responsible for applying indirect function relocations is going |
| 6603 | // to complain about the reloc type. |
| 6604 | // If we are building a dynamic executable, we will have a text |
| 6605 | // relocation. The dynamic loader will set the text segment |
| 6606 | // writable and non-executable to apply text relocations. So we'll |
| 6607 | // segfault when trying to run the indirection function to resolve |
| 6608 | // the reloc. |
| 6609 | if (report_err) |
| 6610 | gold_error(_("%s: unsupported reloc %u for IFUNC symbol"), |
| 6611 | object->name().c_str(), r_type); |
| 6612 | return false; |
| 6613 | } |
| 6614 | |
| 6615 | // Return TRUE iff INSN is one we expect on a _LO variety toc/got |
| 6616 | // reloc. |
| 6617 | |
| 6618 | static bool |
| 6619 | ok_lo_toc_insn(uint32_t insn, unsigned int r_type) |
| 6620 | { |
| 6621 | return ((insn & (0x3f << 26)) == 12u << 26 /* addic */ |
| 6622 | || (insn & (0x3f << 26)) == 14u << 26 /* addi */ |
| 6623 | || (insn & (0x3f << 26)) == 32u << 26 /* lwz */ |
| 6624 | || (insn & (0x3f << 26)) == 34u << 26 /* lbz */ |
| 6625 | || (insn & (0x3f << 26)) == 36u << 26 /* stw */ |
| 6626 | || (insn & (0x3f << 26)) == 38u << 26 /* stb */ |
| 6627 | || (insn & (0x3f << 26)) == 40u << 26 /* lhz */ |
| 6628 | || (insn & (0x3f << 26)) == 42u << 26 /* lha */ |
| 6629 | || (insn & (0x3f << 26)) == 44u << 26 /* sth */ |
| 6630 | || (insn & (0x3f << 26)) == 46u << 26 /* lmw */ |
| 6631 | || (insn & (0x3f << 26)) == 47u << 26 /* stmw */ |
| 6632 | || (insn & (0x3f << 26)) == 48u << 26 /* lfs */ |
| 6633 | || (insn & (0x3f << 26)) == 50u << 26 /* lfd */ |
| 6634 | || (insn & (0x3f << 26)) == 52u << 26 /* stfs */ |
| 6635 | || (insn & (0x3f << 26)) == 54u << 26 /* stfd */ |
| 6636 | || (insn & (0x3f << 26)) == 56u << 26 /* lq,lfq */ |
| 6637 | || ((insn & (0x3f << 26)) == 57u << 26 /* lxsd,lxssp,lfdp */ |
| 6638 | /* Exclude lfqu by testing reloc. If relocs are ever |
| 6639 | defined for the reduced D field in psq_lu then those |
| 6640 | will need testing too. */ |
| 6641 | && r_type != elfcpp::R_PPC64_TOC16_LO |
| 6642 | && r_type != elfcpp::R_POWERPC_GOT16_LO) |
| 6643 | || ((insn & (0x3f << 26)) == 58u << 26 /* ld,lwa */ |
| 6644 | && (insn & 1) == 0) |
| 6645 | || (insn & (0x3f << 26)) == 60u << 26 /* stfq */ |
| 6646 | || ((insn & (0x3f << 26)) == 61u << 26 /* lxv,stx{v,sd,ssp},stfdp */ |
| 6647 | /* Exclude stfqu. psq_stu as above for psq_lu. */ |
| 6648 | && r_type != elfcpp::R_PPC64_TOC16_LO |
| 6649 | && r_type != elfcpp::R_POWERPC_GOT16_LO) |
| 6650 | || ((insn & (0x3f << 26)) == 62u << 26 /* std,stq */ |
| 6651 | && (insn & 1) == 0)); |
| 6652 | } |
| 6653 | |
| 6654 | // Scan a relocation for a local symbol. |
| 6655 | |
| 6656 | template<int size, bool big_endian> |
| 6657 | inline void |
| 6658 | Target_powerpc<size, big_endian>::Scan::local( |
| 6659 | Symbol_table* symtab, |
| 6660 | Layout* layout, |
| 6661 | Target_powerpc<size, big_endian>* target, |
| 6662 | Sized_relobj_file<size, big_endian>* object, |
| 6663 | unsigned int data_shndx, |
| 6664 | Output_section* output_section, |
| 6665 | const elfcpp::Rela<size, big_endian>& reloc, |
| 6666 | unsigned int r_type, |
| 6667 | const elfcpp::Sym<size, big_endian>& lsym, |
| 6668 | bool is_discarded) |
| 6669 | { |
| 6670 | this->maybe_skip_tls_get_addr_call(target, r_type, NULL); |
| 6671 | |
| 6672 | if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 6673 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 6674 | { |
| 6675 | this->expect_tls_get_addr_call(); |
| 6676 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); |
| 6677 | if (tls_type != tls::TLSOPT_NONE) |
| 6678 | this->skip_next_tls_get_addr_call(); |
| 6679 | } |
| 6680 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 6681 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 6682 | { |
| 6683 | this->expect_tls_get_addr_call(); |
| 6684 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 6685 | if (tls_type != tls::TLSOPT_NONE) |
| 6686 | this->skip_next_tls_get_addr_call(); |
| 6687 | } |
| 6688 | |
| 6689 | Powerpc_relobj<size, big_endian>* ppc_object |
| 6690 | = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| 6691 | |
| 6692 | if (is_discarded) |
| 6693 | { |
| 6694 | if (size == 64 |
| 6695 | && data_shndx == ppc_object->opd_shndx() |
| 6696 | && r_type == elfcpp::R_PPC64_ADDR64) |
| 6697 | ppc_object->set_opd_discard(reloc.get_r_offset()); |
| 6698 | return; |
| 6699 | } |
| 6700 | |
| 6701 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
| 6702 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
| 6703 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true)) |
| 6704 | { |
| 6705 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 6706 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 6707 | r_type, r_sym, reloc.get_r_addend()); |
| 6708 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
| 6709 | } |
| 6710 | |
| 6711 | switch (r_type) |
| 6712 | { |
| 6713 | case elfcpp::R_POWERPC_NONE: |
| 6714 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 6715 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 6716 | case elfcpp::R_POWERPC_TLS: |
| 6717 | case elfcpp::R_PPC64_ENTRY: |
| 6718 | case elfcpp::R_POWERPC_PLTSEQ: |
| 6719 | case elfcpp::R_POWERPC_PLTCALL: |
| 6720 | break; |
| 6721 | |
| 6722 | case elfcpp::R_PPC64_TOC: |
| 6723 | { |
| 6724 | Output_data_got_powerpc<size, big_endian>* got |
| 6725 | = target->got_section(symtab, layout); |
| 6726 | if (parameters->options().output_is_position_independent()) |
| 6727 | { |
| 6728 | Address off = reloc.get_r_offset(); |
| 6729 | if (size == 64 |
| 6730 | && target->abiversion() < 2 |
| 6731 | && data_shndx == ppc_object->opd_shndx() |
| 6732 | && ppc_object->get_opd_discard(off - 8)) |
| 6733 | break; |
| 6734 | |
| 6735 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6736 | Powerpc_relobj<size, big_endian>* symobj = ppc_object; |
| 6737 | rela_dyn->add_output_section_relative(got->output_section(), |
| 6738 | elfcpp::R_POWERPC_RELATIVE, |
| 6739 | output_section, |
| 6740 | object, data_shndx, off, |
| 6741 | symobj->toc_base_offset()); |
| 6742 | } |
| 6743 | } |
| 6744 | break; |
| 6745 | |
| 6746 | case elfcpp::R_PPC64_ADDR64: |
| 6747 | case elfcpp::R_PPC64_UADDR64: |
| 6748 | case elfcpp::R_POWERPC_ADDR32: |
| 6749 | case elfcpp::R_POWERPC_UADDR32: |
| 6750 | case elfcpp::R_POWERPC_ADDR24: |
| 6751 | case elfcpp::R_POWERPC_ADDR16: |
| 6752 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 6753 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 6754 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 6755 | case elfcpp::R_POWERPC_UADDR16: |
| 6756 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 6757 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 6758 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 6759 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 6760 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 6761 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 6762 | case elfcpp::R_PPC64_ADDR16_DS: |
| 6763 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 6764 | case elfcpp::R_POWERPC_ADDR14: |
| 6765 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 6766 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 6767 | // If building a shared library (or a position-independent |
| 6768 | // executable), we need to create a dynamic relocation for |
| 6769 | // this location. |
| 6770 | if (parameters->options().output_is_position_independent() |
| 6771 | || (size == 64 && is_ifunc && target->abiversion() < 2)) |
| 6772 | { |
| 6773 | Reloc_section* rela_dyn = target->rela_dyn_section(symtab, layout, |
| 6774 | is_ifunc); |
| 6775 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 6776 | if ((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32) |
| 6777 | || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64)) |
| 6778 | { |
| 6779 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 6780 | : elfcpp::R_POWERPC_RELATIVE); |
| 6781 | rela_dyn->add_local_relative(object, r_sym, dynrel, |
| 6782 | output_section, data_shndx, |
| 6783 | reloc.get_r_offset(), |
| 6784 | reloc.get_r_addend(), false); |
| 6785 | } |
| 6786 | else if (lsym.get_st_type() != elfcpp::STT_SECTION) |
| 6787 | { |
| 6788 | check_non_pic(object, r_type); |
| 6789 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
| 6790 | data_shndx, reloc.get_r_offset(), |
| 6791 | reloc.get_r_addend()); |
| 6792 | } |
| 6793 | else |
| 6794 | { |
| 6795 | gold_assert(lsym.get_st_value() == 0); |
| 6796 | unsigned int shndx = lsym.get_st_shndx(); |
| 6797 | bool is_ordinary; |
| 6798 | shndx = object->adjust_sym_shndx(r_sym, shndx, |
| 6799 | &is_ordinary); |
| 6800 | if (!is_ordinary) |
| 6801 | object->error(_("section symbol %u has bad shndx %u"), |
| 6802 | r_sym, shndx); |
| 6803 | else |
| 6804 | rela_dyn->add_local_section(object, shndx, r_type, |
| 6805 | output_section, data_shndx, |
| 6806 | reloc.get_r_offset()); |
| 6807 | } |
| 6808 | } |
| 6809 | break; |
| 6810 | |
| 6811 | case elfcpp::R_POWERPC_PLT16_LO: |
| 6812 | case elfcpp::R_POWERPC_PLT16_HI: |
| 6813 | case elfcpp::R_POWERPC_PLT16_HA: |
| 6814 | case elfcpp::R_PPC64_PLT16_LO_DS: |
| 6815 | if (!is_ifunc) |
| 6816 | { |
| 6817 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 6818 | target->make_local_plt_entry(layout, object, r_sym); |
| 6819 | } |
| 6820 | break; |
| 6821 | |
| 6822 | case elfcpp::R_POWERPC_REL24: |
| 6823 | case elfcpp::R_PPC_PLTREL24: |
| 6824 | case elfcpp::R_PPC_LOCAL24PC: |
| 6825 | case elfcpp::R_POWERPC_REL14: |
| 6826 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 6827 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 6828 | if (!is_ifunc) |
| 6829 | { |
| 6830 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 6831 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 6832 | r_type, r_sym, reloc.get_r_addend()); |
| 6833 | } |
| 6834 | break; |
| 6835 | |
| 6836 | case elfcpp::R_PPC64_TOCSAVE: |
| 6837 | // R_PPC64_TOCSAVE follows a call instruction to indicate the |
| 6838 | // caller has already saved r2 and thus a plt call stub need not |
| 6839 | // save r2. |
| 6840 | if (size == 64 |
| 6841 | && target->mark_pltcall(ppc_object, data_shndx, |
| 6842 | reloc.get_r_offset() - 4, symtab)) |
| 6843 | { |
| 6844 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 6845 | unsigned int shndx = lsym.get_st_shndx(); |
| 6846 | bool is_ordinary; |
| 6847 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| 6848 | if (!is_ordinary) |
| 6849 | object->error(_("tocsave symbol %u has bad shndx %u"), |
| 6850 | r_sym, shndx); |
| 6851 | else |
| 6852 | target->add_tocsave(ppc_object, shndx, |
| 6853 | lsym.get_st_value() + reloc.get_r_addend()); |
| 6854 | } |
| 6855 | break; |
| 6856 | |
| 6857 | case elfcpp::R_PPC64_REL64: |
| 6858 | case elfcpp::R_POWERPC_REL32: |
| 6859 | case elfcpp::R_POWERPC_REL16: |
| 6860 | case elfcpp::R_POWERPC_REL16_LO: |
| 6861 | case elfcpp::R_POWERPC_REL16_HI: |
| 6862 | case elfcpp::R_POWERPC_REL16_HA: |
| 6863 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 6864 | case elfcpp::R_POWERPC_SECTOFF: |
| 6865 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 6866 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 6867 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 6868 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 6869 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 6870 | case elfcpp::R_POWERPC_TPREL16: |
| 6871 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 6872 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 6873 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 6874 | case elfcpp::R_PPC64_TPREL16_DS: |
| 6875 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 6876 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 6877 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 6878 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 6879 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 6880 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 6881 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 6882 | case elfcpp::R_POWERPC_DTPREL16: |
| 6883 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 6884 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 6885 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 6886 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 6887 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 6888 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 6889 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 6890 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 6891 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 6892 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 6893 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 6894 | case elfcpp::R_PPC64_TLSGD: |
| 6895 | case elfcpp::R_PPC64_TLSLD: |
| 6896 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 6897 | break; |
| 6898 | |
| 6899 | case elfcpp::R_POWERPC_GOT16: |
| 6900 | case elfcpp::R_POWERPC_GOT16_LO: |
| 6901 | case elfcpp::R_POWERPC_GOT16_HI: |
| 6902 | case elfcpp::R_POWERPC_GOT16_HA: |
| 6903 | case elfcpp::R_PPC64_GOT16_DS: |
| 6904 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 6905 | { |
| 6906 | // The symbol requires a GOT entry. |
| 6907 | Output_data_got_powerpc<size, big_endian>* got |
| 6908 | = target->got_section(symtab, layout); |
| 6909 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 6910 | |
| 6911 | if (!parameters->options().output_is_position_independent()) |
| 6912 | { |
| 6913 | if (is_ifunc |
| 6914 | && (size == 32 || target->abiversion() >= 2)) |
| 6915 | got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
| 6916 | else |
| 6917 | got->add_local(object, r_sym, GOT_TYPE_STANDARD); |
| 6918 | } |
| 6919 | else if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) |
| 6920 | { |
| 6921 | // If we are generating a shared object or a pie, this |
| 6922 | // symbol's GOT entry will be set by a dynamic relocation. |
| 6923 | unsigned int off; |
| 6924 | off = got->add_constant(0); |
| 6925 | object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off); |
| 6926 | |
| 6927 | Reloc_section* rela_dyn = target->rela_dyn_section(symtab, layout, |
| 6928 | is_ifunc); |
| 6929 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 6930 | : elfcpp::R_POWERPC_RELATIVE); |
| 6931 | rela_dyn->add_local_relative(object, r_sym, dynrel, |
| 6932 | got, off, 0, false); |
| 6933 | } |
| 6934 | } |
| 6935 | break; |
| 6936 | |
| 6937 | case elfcpp::R_PPC64_TOC16: |
| 6938 | case elfcpp::R_PPC64_TOC16_LO: |
| 6939 | case elfcpp::R_PPC64_TOC16_HI: |
| 6940 | case elfcpp::R_PPC64_TOC16_HA: |
| 6941 | case elfcpp::R_PPC64_TOC16_DS: |
| 6942 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 6943 | // We need a GOT section. |
| 6944 | target->got_section(symtab, layout); |
| 6945 | break; |
| 6946 | |
| 6947 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 6948 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 6949 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 6950 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 6951 | { |
| 6952 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); |
| 6953 | if (tls_type == tls::TLSOPT_NONE) |
| 6954 | { |
| 6955 | Output_data_got_powerpc<size, big_endian>* got |
| 6956 | = target->got_section(symtab, layout); |
| 6957 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 6958 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6959 | got->add_local_tls_pair(object, r_sym, GOT_TYPE_TLSGD, |
| 6960 | rela_dyn, elfcpp::R_POWERPC_DTPMOD); |
| 6961 | } |
| 6962 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 6963 | { |
| 6964 | // no GOT relocs needed for Local Exec. |
| 6965 | } |
| 6966 | else |
| 6967 | gold_unreachable(); |
| 6968 | } |
| 6969 | break; |
| 6970 | |
| 6971 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 6972 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 6973 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 6974 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 6975 | { |
| 6976 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 6977 | if (tls_type == tls::TLSOPT_NONE) |
| 6978 | target->tlsld_got_offset(symtab, layout, object); |
| 6979 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 6980 | { |
| 6981 | // no GOT relocs needed for Local Exec. |
| 6982 | if (parameters->options().emit_relocs()) |
| 6983 | { |
| 6984 | Output_section* os = layout->tls_segment()->first_section(); |
| 6985 | gold_assert(os != NULL); |
| 6986 | os->set_needs_symtab_index(); |
| 6987 | } |
| 6988 | } |
| 6989 | else |
| 6990 | gold_unreachable(); |
| 6991 | } |
| 6992 | break; |
| 6993 | |
| 6994 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 6995 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 6996 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 6997 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 6998 | { |
| 6999 | Output_data_got_powerpc<size, big_endian>* got |
| 7000 | = target->got_section(symtab, layout); |
| 7001 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7002 | got->add_local_tls(object, r_sym, GOT_TYPE_DTPREL); |
| 7003 | } |
| 7004 | break; |
| 7005 | |
| 7006 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 7007 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 7008 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 7009 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 7010 | { |
| 7011 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(true); |
| 7012 | if (tls_type == tls::TLSOPT_NONE) |
| 7013 | { |
| 7014 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7015 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)) |
| 7016 | { |
| 7017 | Output_data_got_powerpc<size, big_endian>* got |
| 7018 | = target->got_section(symtab, layout); |
| 7019 | unsigned int off = got->add_constant(0); |
| 7020 | object->set_local_got_offset(r_sym, GOT_TYPE_TPREL, off); |
| 7021 | |
| 7022 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 7023 | rela_dyn->add_symbolless_local_addend(object, r_sym, |
| 7024 | elfcpp::R_POWERPC_TPREL, |
| 7025 | got, off, 0); |
| 7026 | } |
| 7027 | } |
| 7028 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 7029 | { |
| 7030 | // no GOT relocs needed for Local Exec. |
| 7031 | } |
| 7032 | else |
| 7033 | gold_unreachable(); |
| 7034 | } |
| 7035 | break; |
| 7036 | |
| 7037 | default: |
| 7038 | unsupported_reloc_local(object, r_type); |
| 7039 | break; |
| 7040 | } |
| 7041 | |
| 7042 | if (size == 64 |
| 7043 | && parameters->options().toc_optimize()) |
| 7044 | { |
| 7045 | if (data_shndx == ppc_object->toc_shndx()) |
| 7046 | { |
| 7047 | bool ok = true; |
| 7048 | if (r_type != elfcpp::R_PPC64_ADDR64 |
| 7049 | || (is_ifunc && target->abiversion() < 2)) |
| 7050 | ok = false; |
| 7051 | else if (parameters->options().output_is_position_independent()) |
| 7052 | { |
| 7053 | if (is_ifunc) |
| 7054 | ok = false; |
| 7055 | else |
| 7056 | { |
| 7057 | unsigned int shndx = lsym.get_st_shndx(); |
| 7058 | if (shndx >= elfcpp::SHN_LORESERVE |
| 7059 | && shndx != elfcpp::SHN_XINDEX) |
| 7060 | ok = false; |
| 7061 | } |
| 7062 | } |
| 7063 | if (!ok) |
| 7064 | ppc_object->set_no_toc_opt(reloc.get_r_offset()); |
| 7065 | } |
| 7066 | |
| 7067 | enum {no_check, check_lo, check_ha} insn_check; |
| 7068 | switch (r_type) |
| 7069 | { |
| 7070 | default: |
| 7071 | insn_check = no_check; |
| 7072 | break; |
| 7073 | |
| 7074 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 7075 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 7076 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 7077 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 7078 | case elfcpp::R_POWERPC_GOT16_HA: |
| 7079 | case elfcpp::R_PPC64_TOC16_HA: |
| 7080 | insn_check = check_ha; |
| 7081 | break; |
| 7082 | |
| 7083 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 7084 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 7085 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 7086 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 7087 | case elfcpp::R_POWERPC_GOT16_LO: |
| 7088 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 7089 | case elfcpp::R_PPC64_TOC16_LO: |
| 7090 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 7091 | insn_check = check_lo; |
| 7092 | break; |
| 7093 | } |
| 7094 | |
| 7095 | section_size_type slen; |
| 7096 | const unsigned char* view = NULL; |
| 7097 | if (insn_check != no_check) |
| 7098 | { |
| 7099 | view = ppc_object->section_contents(data_shndx, &slen, false); |
| 7100 | section_size_type off = |
| 7101 | convert_to_section_size_type(reloc.get_r_offset()) & -4; |
| 7102 | if (off < slen) |
| 7103 | { |
| 7104 | uint32_t insn = elfcpp::Swap<32, big_endian>::readval(view + off); |
| 7105 | if (insn_check == check_lo |
| 7106 | ? !ok_lo_toc_insn(insn, r_type) |
| 7107 | : ((insn & ((0x3f << 26) | 0x1f << 16)) |
| 7108 | != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */)) |
| 7109 | { |
| 7110 | ppc_object->set_no_toc_opt(); |
| 7111 | gold_warning(_("%s: toc optimization is not supported " |
| 7112 | "for %#08x instruction"), |
| 7113 | ppc_object->name().c_str(), insn); |
| 7114 | } |
| 7115 | } |
| 7116 | } |
| 7117 | |
| 7118 | switch (r_type) |
| 7119 | { |
| 7120 | default: |
| 7121 | break; |
| 7122 | case elfcpp::R_PPC64_TOC16: |
| 7123 | case elfcpp::R_PPC64_TOC16_LO: |
| 7124 | case elfcpp::R_PPC64_TOC16_HI: |
| 7125 | case elfcpp::R_PPC64_TOC16_HA: |
| 7126 | case elfcpp::R_PPC64_TOC16_DS: |
| 7127 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 7128 | unsigned int shndx = lsym.get_st_shndx(); |
| 7129 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7130 | bool is_ordinary; |
| 7131 | shndx = ppc_object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| 7132 | if (is_ordinary && shndx == ppc_object->toc_shndx()) |
| 7133 | { |
| 7134 | Address dst_off = lsym.get_st_value() + reloc.get_r_addend(); |
| 7135 | if (dst_off < ppc_object->section_size(shndx)) |
| 7136 | { |
| 7137 | bool ok = false; |
| 7138 | if (r_type == elfcpp::R_PPC64_TOC16_HA) |
| 7139 | ok = true; |
| 7140 | else if (r_type == elfcpp::R_PPC64_TOC16_LO_DS) |
| 7141 | { |
| 7142 | // Need to check that the insn is a ld |
| 7143 | if (!view) |
| 7144 | view = ppc_object->section_contents(data_shndx, |
| 7145 | &slen, |
| 7146 | false); |
| 7147 | section_size_type off = |
| 7148 | (convert_to_section_size_type(reloc.get_r_offset()) |
| 7149 | + (big_endian ? -2 : 3)); |
| 7150 | if (off < slen |
| 7151 | && (view[off] & (0x3f << 2)) == 58u << 2) |
| 7152 | ok = true; |
| 7153 | } |
| 7154 | if (!ok) |
| 7155 | ppc_object->set_no_toc_opt(dst_off); |
| 7156 | } |
| 7157 | } |
| 7158 | break; |
| 7159 | } |
| 7160 | } |
| 7161 | |
| 7162 | if (size == 32) |
| 7163 | { |
| 7164 | switch (r_type) |
| 7165 | { |
| 7166 | case elfcpp::R_POWERPC_REL32: |
| 7167 | if (ppc_object->got2_shndx() != 0 |
| 7168 | && parameters->options().output_is_position_independent()) |
| 7169 | { |
| 7170 | unsigned int shndx = lsym.get_st_shndx(); |
| 7171 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7172 | bool is_ordinary; |
| 7173 | shndx = ppc_object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| 7174 | if (is_ordinary && shndx == ppc_object->got2_shndx() |
| 7175 | && (ppc_object->section_flags(data_shndx) |
| 7176 | & elfcpp::SHF_EXECINSTR) != 0) |
| 7177 | gold_error(_("%s: unsupported -mbss-plt code"), |
| 7178 | ppc_object->name().c_str()); |
| 7179 | } |
| 7180 | break; |
| 7181 | default: |
| 7182 | break; |
| 7183 | } |
| 7184 | } |
| 7185 | |
| 7186 | switch (r_type) |
| 7187 | { |
| 7188 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 7189 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 7190 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 7191 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 7192 | case elfcpp::R_POWERPC_GOT16: |
| 7193 | case elfcpp::R_PPC64_GOT16_DS: |
| 7194 | case elfcpp::R_PPC64_TOC16: |
| 7195 | case elfcpp::R_PPC64_TOC16_DS: |
| 7196 | ppc_object->set_has_small_toc_reloc(); |
| 7197 | default: |
| 7198 | break; |
| 7199 | } |
| 7200 | } |
| 7201 | |
| 7202 | // Report an unsupported relocation against a global symbol. |
| 7203 | |
| 7204 | template<int size, bool big_endian> |
| 7205 | void |
| 7206 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global( |
| 7207 | Sized_relobj_file<size, big_endian>* object, |
| 7208 | unsigned int r_type, |
| 7209 | Symbol* gsym) |
| 7210 | { |
| 7211 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 7212 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| 7213 | } |
| 7214 | |
| 7215 | // Scan a relocation for a global symbol. |
| 7216 | |
| 7217 | template<int size, bool big_endian> |
| 7218 | inline void |
| 7219 | Target_powerpc<size, big_endian>::Scan::global( |
| 7220 | Symbol_table* symtab, |
| 7221 | Layout* layout, |
| 7222 | Target_powerpc<size, big_endian>* target, |
| 7223 | Sized_relobj_file<size, big_endian>* object, |
| 7224 | unsigned int data_shndx, |
| 7225 | Output_section* output_section, |
| 7226 | const elfcpp::Rela<size, big_endian>& reloc, |
| 7227 | unsigned int r_type, |
| 7228 | Symbol* gsym) |
| 7229 | { |
| 7230 | if (this->maybe_skip_tls_get_addr_call(target, r_type, gsym) |
| 7231 | == Track_tls::SKIP) |
| 7232 | return; |
| 7233 | |
| 7234 | if (target->replace_tls_get_addr(gsym)) |
| 7235 | // Change a __tls_get_addr reference to __tls_get_addr_opt |
| 7236 | // so dynamic relocs are emitted against the latter symbol. |
| 7237 | gsym = target->tls_get_addr_opt(); |
| 7238 | |
| 7239 | if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 7240 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 7241 | { |
| 7242 | this->expect_tls_get_addr_call(); |
| 7243 | const bool final = gsym->final_value_is_known(); |
| 7244 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 7245 | if (tls_type != tls::TLSOPT_NONE) |
| 7246 | this->skip_next_tls_get_addr_call(); |
| 7247 | } |
| 7248 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 7249 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 7250 | { |
| 7251 | this->expect_tls_get_addr_call(); |
| 7252 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 7253 | if (tls_type != tls::TLSOPT_NONE) |
| 7254 | this->skip_next_tls_get_addr_call(); |
| 7255 | } |
| 7256 | |
| 7257 | Powerpc_relobj<size, big_endian>* ppc_object |
| 7258 | = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| 7259 | |
| 7260 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
| 7261 | bool is_ifunc = gsym->type() == elfcpp::STT_GNU_IFUNC; |
| 7262 | bool pushed_ifunc = false; |
| 7263 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true)) |
| 7264 | { |
| 7265 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7266 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 7267 | r_type, r_sym, reloc.get_r_addend()); |
| 7268 | target->make_plt_entry(symtab, layout, gsym); |
| 7269 | pushed_ifunc = true; |
| 7270 | } |
| 7271 | |
| 7272 | switch (r_type) |
| 7273 | { |
| 7274 | case elfcpp::R_POWERPC_NONE: |
| 7275 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 7276 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 7277 | case elfcpp::R_PPC_LOCAL24PC: |
| 7278 | case elfcpp::R_POWERPC_TLS: |
| 7279 | case elfcpp::R_PPC64_ENTRY: |
| 7280 | case elfcpp::R_POWERPC_PLTSEQ: |
| 7281 | case elfcpp::R_POWERPC_PLTCALL: |
| 7282 | break; |
| 7283 | |
| 7284 | case elfcpp::R_PPC64_TOC: |
| 7285 | { |
| 7286 | Output_data_got_powerpc<size, big_endian>* got |
| 7287 | = target->got_section(symtab, layout); |
| 7288 | if (parameters->options().output_is_position_independent()) |
| 7289 | { |
| 7290 | Address off = reloc.get_r_offset(); |
| 7291 | if (size == 64 |
| 7292 | && data_shndx == ppc_object->opd_shndx() |
| 7293 | && ppc_object->get_opd_discard(off - 8)) |
| 7294 | break; |
| 7295 | |
| 7296 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 7297 | Powerpc_relobj<size, big_endian>* symobj = ppc_object; |
| 7298 | if (data_shndx != ppc_object->opd_shndx()) |
| 7299 | symobj = static_cast |
| 7300 | <Powerpc_relobj<size, big_endian>*>(gsym->object()); |
| 7301 | rela_dyn->add_output_section_relative(got->output_section(), |
| 7302 | elfcpp::R_POWERPC_RELATIVE, |
| 7303 | output_section, |
| 7304 | object, data_shndx, off, |
| 7305 | symobj->toc_base_offset()); |
| 7306 | } |
| 7307 | } |
| 7308 | break; |
| 7309 | |
| 7310 | case elfcpp::R_PPC64_ADDR64: |
| 7311 | if (size == 64 |
| 7312 | && target->abiversion() < 2 |
| 7313 | && data_shndx == ppc_object->opd_shndx() |
| 7314 | && (gsym->is_defined_in_discarded_section() |
| 7315 | || gsym->object() != object)) |
| 7316 | { |
| 7317 | ppc_object->set_opd_discard(reloc.get_r_offset()); |
| 7318 | break; |
| 7319 | } |
| 7320 | // Fall through. |
| 7321 | case elfcpp::R_PPC64_UADDR64: |
| 7322 | case elfcpp::R_POWERPC_ADDR32: |
| 7323 | case elfcpp::R_POWERPC_UADDR32: |
| 7324 | case elfcpp::R_POWERPC_ADDR24: |
| 7325 | case elfcpp::R_POWERPC_ADDR16: |
| 7326 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 7327 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 7328 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 7329 | case elfcpp::R_POWERPC_UADDR16: |
| 7330 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 7331 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 7332 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 7333 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 7334 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 7335 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 7336 | case elfcpp::R_PPC64_ADDR16_DS: |
| 7337 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 7338 | case elfcpp::R_POWERPC_ADDR14: |
| 7339 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 7340 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 7341 | { |
| 7342 | // Make a PLT entry if necessary. |
| 7343 | if (gsym->needs_plt_entry()) |
| 7344 | { |
| 7345 | // Since this is not a PC-relative relocation, we may be |
| 7346 | // taking the address of a function. In that case we need to |
| 7347 | // set the entry in the dynamic symbol table to the address of |
| 7348 | // the PLT call stub. |
| 7349 | bool need_ifunc_plt = false; |
| 7350 | if ((size == 32 || target->abiversion() >= 2) |
| 7351 | && gsym->is_from_dynobj() |
| 7352 | && !parameters->options().output_is_position_independent()) |
| 7353 | { |
| 7354 | gsym->set_needs_dynsym_value(); |
| 7355 | need_ifunc_plt = true; |
| 7356 | } |
| 7357 | if (!is_ifunc || (!pushed_ifunc && need_ifunc_plt)) |
| 7358 | { |
| 7359 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7360 | target->push_branch(ppc_object, data_shndx, |
| 7361 | reloc.get_r_offset(), r_type, r_sym, |
| 7362 | reloc.get_r_addend()); |
| 7363 | target->make_plt_entry(symtab, layout, gsym); |
| 7364 | } |
| 7365 | } |
| 7366 | // Make a dynamic relocation if necessary. |
| 7367 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target)) |
| 7368 | || (size == 64 && is_ifunc && target->abiversion() < 2)) |
| 7369 | { |
| 7370 | if (!parameters->options().output_is_position_independent() |
| 7371 | && gsym->may_need_copy_reloc()) |
| 7372 | { |
| 7373 | target->copy_reloc(symtab, layout, object, |
| 7374 | data_shndx, output_section, gsym, reloc); |
| 7375 | } |
| 7376 | else if ((((size == 32 |
| 7377 | && r_type == elfcpp::R_POWERPC_ADDR32) |
| 7378 | || (size == 64 |
| 7379 | && r_type == elfcpp::R_PPC64_ADDR64 |
| 7380 | && target->abiversion() >= 2)) |
| 7381 | && gsym->can_use_relative_reloc(false) |
| 7382 | && !(gsym->visibility() == elfcpp::STV_PROTECTED |
| 7383 | && parameters->options().shared())) |
| 7384 | || (size == 64 |
| 7385 | && r_type == elfcpp::R_PPC64_ADDR64 |
| 7386 | && target->abiversion() < 2 |
| 7387 | && (gsym->can_use_relative_reloc(false) |
| 7388 | || data_shndx == ppc_object->opd_shndx()))) |
| 7389 | { |
| 7390 | Reloc_section* rela_dyn |
| 7391 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 7392 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 7393 | : elfcpp::R_POWERPC_RELATIVE); |
| 7394 | rela_dyn->add_symbolless_global_addend( |
| 7395 | gsym, dynrel, output_section, object, data_shndx, |
| 7396 | reloc.get_r_offset(), reloc.get_r_addend()); |
| 7397 | } |
| 7398 | else |
| 7399 | { |
| 7400 | Reloc_section* rela_dyn |
| 7401 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 7402 | check_non_pic(object, r_type); |
| 7403 | rela_dyn->add_global(gsym, r_type, output_section, |
| 7404 | object, data_shndx, |
| 7405 | reloc.get_r_offset(), |
| 7406 | reloc.get_r_addend()); |
| 7407 | |
| 7408 | if (size == 64 |
| 7409 | && parameters->options().toc_optimize() |
| 7410 | && data_shndx == ppc_object->toc_shndx()) |
| 7411 | ppc_object->set_no_toc_opt(reloc.get_r_offset()); |
| 7412 | } |
| 7413 | } |
| 7414 | } |
| 7415 | break; |
| 7416 | |
| 7417 | case elfcpp::R_POWERPC_PLT16_LO: |
| 7418 | case elfcpp::R_POWERPC_PLT16_HI: |
| 7419 | case elfcpp::R_POWERPC_PLT16_HA: |
| 7420 | case elfcpp::R_PPC64_PLT16_LO_DS: |
| 7421 | if (!pushed_ifunc) |
| 7422 | target->make_plt_entry(symtab, layout, gsym); |
| 7423 | break; |
| 7424 | |
| 7425 | case elfcpp::R_PPC_PLTREL24: |
| 7426 | case elfcpp::R_POWERPC_REL24: |
| 7427 | if (!is_ifunc) |
| 7428 | { |
| 7429 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7430 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 7431 | r_type, r_sym, reloc.get_r_addend()); |
| 7432 | if (gsym->needs_plt_entry() |
| 7433 | || (!gsym->final_value_is_known() |
| 7434 | && (gsym->is_undefined() |
| 7435 | || gsym->is_from_dynobj() |
| 7436 | || gsym->is_preemptible()))) |
| 7437 | target->make_plt_entry(symtab, layout, gsym); |
| 7438 | } |
| 7439 | // Fall through. |
| 7440 | |
| 7441 | case elfcpp::R_PPC64_REL64: |
| 7442 | case elfcpp::R_POWERPC_REL32: |
| 7443 | // Make a dynamic relocation if necessary. |
| 7444 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target))) |
| 7445 | { |
| 7446 | if (!parameters->options().output_is_position_independent() |
| 7447 | && gsym->may_need_copy_reloc()) |
| 7448 | { |
| 7449 | target->copy_reloc(symtab, layout, object, |
| 7450 | data_shndx, output_section, gsym, |
| 7451 | reloc); |
| 7452 | } |
| 7453 | else |
| 7454 | { |
| 7455 | Reloc_section* rela_dyn |
| 7456 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 7457 | check_non_pic(object, r_type); |
| 7458 | rela_dyn->add_global(gsym, r_type, output_section, object, |
| 7459 | data_shndx, reloc.get_r_offset(), |
| 7460 | reloc.get_r_addend()); |
| 7461 | } |
| 7462 | } |
| 7463 | break; |
| 7464 | |
| 7465 | case elfcpp::R_POWERPC_REL14: |
| 7466 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 7467 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 7468 | if (!is_ifunc) |
| 7469 | { |
| 7470 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7471 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 7472 | r_type, r_sym, reloc.get_r_addend()); |
| 7473 | } |
| 7474 | break; |
| 7475 | |
| 7476 | case elfcpp::R_PPC64_TOCSAVE: |
| 7477 | // R_PPC64_TOCSAVE follows a call instruction to indicate the |
| 7478 | // caller has already saved r2 and thus a plt call stub need not |
| 7479 | // save r2. |
| 7480 | if (size == 64 |
| 7481 | && target->mark_pltcall(ppc_object, data_shndx, |
| 7482 | reloc.get_r_offset() - 4, symtab)) |
| 7483 | { |
| 7484 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 7485 | bool is_ordinary; |
| 7486 | unsigned int shndx = gsym->shndx(&is_ordinary); |
| 7487 | if (!is_ordinary) |
| 7488 | object->error(_("tocsave symbol %u has bad shndx %u"), |
| 7489 | r_sym, shndx); |
| 7490 | else |
| 7491 | { |
| 7492 | Sized_symbol<size>* sym = symtab->get_sized_symbol<size>(gsym); |
| 7493 | target->add_tocsave(ppc_object, shndx, |
| 7494 | sym->value() + reloc.get_r_addend()); |
| 7495 | } |
| 7496 | } |
| 7497 | break; |
| 7498 | |
| 7499 | case elfcpp::R_POWERPC_REL16: |
| 7500 | case elfcpp::R_POWERPC_REL16_LO: |
| 7501 | case elfcpp::R_POWERPC_REL16_HI: |
| 7502 | case elfcpp::R_POWERPC_REL16_HA: |
| 7503 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 7504 | case elfcpp::R_POWERPC_SECTOFF: |
| 7505 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 7506 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 7507 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 7508 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 7509 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 7510 | case elfcpp::R_POWERPC_TPREL16: |
| 7511 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 7512 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 7513 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 7514 | case elfcpp::R_PPC64_TPREL16_DS: |
| 7515 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 7516 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 7517 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 7518 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 7519 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 7520 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 7521 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 7522 | case elfcpp::R_POWERPC_DTPREL16: |
| 7523 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 7524 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 7525 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 7526 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 7527 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 7528 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 7529 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 7530 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 7531 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 7532 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 7533 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 7534 | case elfcpp::R_PPC64_TLSGD: |
| 7535 | case elfcpp::R_PPC64_TLSLD: |
| 7536 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 7537 | break; |
| 7538 | |
| 7539 | case elfcpp::R_POWERPC_GOT16: |
| 7540 | case elfcpp::R_POWERPC_GOT16_LO: |
| 7541 | case elfcpp::R_POWERPC_GOT16_HI: |
| 7542 | case elfcpp::R_POWERPC_GOT16_HA: |
| 7543 | case elfcpp::R_PPC64_GOT16_DS: |
| 7544 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 7545 | { |
| 7546 | // The symbol requires a GOT entry. |
| 7547 | Output_data_got_powerpc<size, big_endian>* got; |
| 7548 | |
| 7549 | got = target->got_section(symtab, layout); |
| 7550 | if (gsym->final_value_is_known()) |
| 7551 | { |
| 7552 | if (is_ifunc |
| 7553 | && (size == 32 || target->abiversion() >= 2)) |
| 7554 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 7555 | else |
| 7556 | got->add_global(gsym, GOT_TYPE_STANDARD); |
| 7557 | } |
| 7558 | else if (!gsym->has_got_offset(GOT_TYPE_STANDARD)) |
| 7559 | { |
| 7560 | // If we are generating a shared object or a pie, this |
| 7561 | // symbol's GOT entry will be set by a dynamic relocation. |
| 7562 | unsigned int off = got->add_constant(0); |
| 7563 | gsym->set_got_offset(GOT_TYPE_STANDARD, off); |
| 7564 | |
| 7565 | Reloc_section* rela_dyn |
| 7566 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 7567 | |
| 7568 | if (gsym->can_use_relative_reloc(false) |
| 7569 | && !((size == 32 |
| 7570 | || target->abiversion() >= 2) |
| 7571 | && gsym->visibility() == elfcpp::STV_PROTECTED |
| 7572 | && parameters->options().shared())) |
| 7573 | { |
| 7574 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 7575 | : elfcpp::R_POWERPC_RELATIVE); |
| 7576 | rela_dyn->add_global_relative(gsym, dynrel, got, off, 0, false); |
| 7577 | } |
| 7578 | else |
| 7579 | { |
| 7580 | unsigned int dynrel = elfcpp::R_POWERPC_GLOB_DAT; |
| 7581 | rela_dyn->add_global(gsym, dynrel, got, off, 0); |
| 7582 | } |
| 7583 | } |
| 7584 | } |
| 7585 | break; |
| 7586 | |
| 7587 | case elfcpp::R_PPC64_TOC16: |
| 7588 | case elfcpp::R_PPC64_TOC16_LO: |
| 7589 | case elfcpp::R_PPC64_TOC16_HI: |
| 7590 | case elfcpp::R_PPC64_TOC16_HA: |
| 7591 | case elfcpp::R_PPC64_TOC16_DS: |
| 7592 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 7593 | // We need a GOT section. |
| 7594 | target->got_section(symtab, layout); |
| 7595 | break; |
| 7596 | |
| 7597 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 7598 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 7599 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 7600 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 7601 | { |
| 7602 | const bool final = gsym->final_value_is_known(); |
| 7603 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 7604 | if (tls_type == tls::TLSOPT_NONE) |
| 7605 | { |
| 7606 | Output_data_got_powerpc<size, big_endian>* got |
| 7607 | = target->got_section(symtab, layout); |
| 7608 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 7609 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD, rela_dyn, |
| 7610 | elfcpp::R_POWERPC_DTPMOD, |
| 7611 | elfcpp::R_POWERPC_DTPREL); |
| 7612 | } |
| 7613 | else if (tls_type == tls::TLSOPT_TO_IE) |
| 7614 | { |
| 7615 | if (!gsym->has_got_offset(GOT_TYPE_TPREL)) |
| 7616 | { |
| 7617 | Output_data_got_powerpc<size, big_endian>* got |
| 7618 | = target->got_section(symtab, layout); |
| 7619 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 7620 | if (gsym->is_undefined() |
| 7621 | || gsym->is_from_dynobj()) |
| 7622 | { |
| 7623 | got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn, |
| 7624 | elfcpp::R_POWERPC_TPREL); |
| 7625 | } |
| 7626 | else |
| 7627 | { |
| 7628 | unsigned int off = got->add_constant(0); |
| 7629 | gsym->set_got_offset(GOT_TYPE_TPREL, off); |
| 7630 | unsigned int dynrel = elfcpp::R_POWERPC_TPREL; |
| 7631 | rela_dyn->add_symbolless_global_addend(gsym, dynrel, |
| 7632 | got, off, 0); |
| 7633 | } |
| 7634 | } |
| 7635 | } |
| 7636 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 7637 | { |
| 7638 | // no GOT relocs needed for Local Exec. |
| 7639 | } |
| 7640 | else |
| 7641 | gold_unreachable(); |
| 7642 | } |
| 7643 | break; |
| 7644 | |
| 7645 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 7646 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 7647 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 7648 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 7649 | { |
| 7650 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 7651 | if (tls_type == tls::TLSOPT_NONE) |
| 7652 | target->tlsld_got_offset(symtab, layout, object); |
| 7653 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 7654 | { |
| 7655 | // no GOT relocs needed for Local Exec. |
| 7656 | if (parameters->options().emit_relocs()) |
| 7657 | { |
| 7658 | Output_section* os = layout->tls_segment()->first_section(); |
| 7659 | gold_assert(os != NULL); |
| 7660 | os->set_needs_symtab_index(); |
| 7661 | } |
| 7662 | } |
| 7663 | else |
| 7664 | gold_unreachable(); |
| 7665 | } |
| 7666 | break; |
| 7667 | |
| 7668 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 7669 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 7670 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 7671 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 7672 | { |
| 7673 | Output_data_got_powerpc<size, big_endian>* got |
| 7674 | = target->got_section(symtab, layout); |
| 7675 | if (!gsym->final_value_is_known() |
| 7676 | && (gsym->is_from_dynobj() |
| 7677 | || gsym->is_undefined() |
| 7678 | || gsym->is_preemptible())) |
| 7679 | got->add_global_with_rel(gsym, GOT_TYPE_DTPREL, |
| 7680 | target->rela_dyn_section(layout), |
| 7681 | elfcpp::R_POWERPC_DTPREL); |
| 7682 | else |
| 7683 | got->add_global_tls(gsym, GOT_TYPE_DTPREL); |
| 7684 | } |
| 7685 | break; |
| 7686 | |
| 7687 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 7688 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 7689 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 7690 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 7691 | { |
| 7692 | const bool final = gsym->final_value_is_known(); |
| 7693 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| 7694 | if (tls_type == tls::TLSOPT_NONE) |
| 7695 | { |
| 7696 | if (!gsym->has_got_offset(GOT_TYPE_TPREL)) |
| 7697 | { |
| 7698 | Output_data_got_powerpc<size, big_endian>* got |
| 7699 | = target->got_section(symtab, layout); |
| 7700 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 7701 | if (gsym->is_undefined() |
| 7702 | || gsym->is_from_dynobj()) |
| 7703 | { |
| 7704 | got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn, |
| 7705 | elfcpp::R_POWERPC_TPREL); |
| 7706 | } |
| 7707 | else |
| 7708 | { |
| 7709 | unsigned int off = got->add_constant(0); |
| 7710 | gsym->set_got_offset(GOT_TYPE_TPREL, off); |
| 7711 | unsigned int dynrel = elfcpp::R_POWERPC_TPREL; |
| 7712 | rela_dyn->add_symbolless_global_addend(gsym, dynrel, |
| 7713 | got, off, 0); |
| 7714 | } |
| 7715 | } |
| 7716 | } |
| 7717 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 7718 | { |
| 7719 | // no GOT relocs needed for Local Exec. |
| 7720 | } |
| 7721 | else |
| 7722 | gold_unreachable(); |
| 7723 | } |
| 7724 | break; |
| 7725 | |
| 7726 | default: |
| 7727 | unsupported_reloc_global(object, r_type, gsym); |
| 7728 | break; |
| 7729 | } |
| 7730 | |
| 7731 | if (size == 64 |
| 7732 | && parameters->options().toc_optimize()) |
| 7733 | { |
| 7734 | if (data_shndx == ppc_object->toc_shndx()) |
| 7735 | { |
| 7736 | bool ok = true; |
| 7737 | if (r_type != elfcpp::R_PPC64_ADDR64 |
| 7738 | || (is_ifunc && target->abiversion() < 2)) |
| 7739 | ok = false; |
| 7740 | else if (parameters->options().output_is_position_independent() |
| 7741 | && (is_ifunc || gsym->is_absolute() || gsym->is_undefined())) |
| 7742 | ok = false; |
| 7743 | if (!ok) |
| 7744 | ppc_object->set_no_toc_opt(reloc.get_r_offset()); |
| 7745 | } |
| 7746 | |
| 7747 | enum {no_check, check_lo, check_ha} insn_check; |
| 7748 | switch (r_type) |
| 7749 | { |
| 7750 | default: |
| 7751 | insn_check = no_check; |
| 7752 | break; |
| 7753 | |
| 7754 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 7755 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 7756 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 7757 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 7758 | case elfcpp::R_POWERPC_GOT16_HA: |
| 7759 | case elfcpp::R_PPC64_TOC16_HA: |
| 7760 | insn_check = check_ha; |
| 7761 | break; |
| 7762 | |
| 7763 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 7764 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 7765 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 7766 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 7767 | case elfcpp::R_POWERPC_GOT16_LO: |
| 7768 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 7769 | case elfcpp::R_PPC64_TOC16_LO: |
| 7770 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 7771 | insn_check = check_lo; |
| 7772 | break; |
| 7773 | } |
| 7774 | |
| 7775 | section_size_type slen; |
| 7776 | const unsigned char* view = NULL; |
| 7777 | if (insn_check != no_check) |
| 7778 | { |
| 7779 | view = ppc_object->section_contents(data_shndx, &slen, false); |
| 7780 | section_size_type off = |
| 7781 | convert_to_section_size_type(reloc.get_r_offset()) & -4; |
| 7782 | if (off < slen) |
| 7783 | { |
| 7784 | uint32_t insn = elfcpp::Swap<32, big_endian>::readval(view + off); |
| 7785 | if (insn_check == check_lo |
| 7786 | ? !ok_lo_toc_insn(insn, r_type) |
| 7787 | : ((insn & ((0x3f << 26) | 0x1f << 16)) |
| 7788 | != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */)) |
| 7789 | { |
| 7790 | ppc_object->set_no_toc_opt(); |
| 7791 | gold_warning(_("%s: toc optimization is not supported " |
| 7792 | "for %#08x instruction"), |
| 7793 | ppc_object->name().c_str(), insn); |
| 7794 | } |
| 7795 | } |
| 7796 | } |
| 7797 | |
| 7798 | switch (r_type) |
| 7799 | { |
| 7800 | default: |
| 7801 | break; |
| 7802 | case elfcpp::R_PPC64_TOC16: |
| 7803 | case elfcpp::R_PPC64_TOC16_LO: |
| 7804 | case elfcpp::R_PPC64_TOC16_HI: |
| 7805 | case elfcpp::R_PPC64_TOC16_HA: |
| 7806 | case elfcpp::R_PPC64_TOC16_DS: |
| 7807 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 7808 | if (gsym->source() == Symbol::FROM_OBJECT |
| 7809 | && !gsym->object()->is_dynamic()) |
| 7810 | { |
| 7811 | Powerpc_relobj<size, big_endian>* sym_object |
| 7812 | = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object()); |
| 7813 | bool is_ordinary; |
| 7814 | unsigned int shndx = gsym->shndx(&is_ordinary); |
| 7815 | if (shndx == sym_object->toc_shndx()) |
| 7816 | { |
| 7817 | Sized_symbol<size>* sym = symtab->get_sized_symbol<size>(gsym); |
| 7818 | Address dst_off = sym->value() + reloc.get_r_addend(); |
| 7819 | if (dst_off < sym_object->section_size(shndx)) |
| 7820 | { |
| 7821 | bool ok = false; |
| 7822 | if (r_type == elfcpp::R_PPC64_TOC16_HA) |
| 7823 | ok = true; |
| 7824 | else if (r_type == elfcpp::R_PPC64_TOC16_LO_DS) |
| 7825 | { |
| 7826 | // Need to check that the insn is a ld |
| 7827 | if (!view) |
| 7828 | view = ppc_object->section_contents(data_shndx, |
| 7829 | &slen, |
| 7830 | false); |
| 7831 | section_size_type off = |
| 7832 | (convert_to_section_size_type(reloc.get_r_offset()) |
| 7833 | + (big_endian ? -2 : 3)); |
| 7834 | if (off < slen |
| 7835 | && (view[off] & (0x3f << 2)) == (58u << 2)) |
| 7836 | ok = true; |
| 7837 | } |
| 7838 | if (!ok) |
| 7839 | sym_object->set_no_toc_opt(dst_off); |
| 7840 | } |
| 7841 | } |
| 7842 | } |
| 7843 | break; |
| 7844 | } |
| 7845 | } |
| 7846 | |
| 7847 | if (size == 32) |
| 7848 | { |
| 7849 | switch (r_type) |
| 7850 | { |
| 7851 | case elfcpp::R_PPC_LOCAL24PC: |
| 7852 | if (strcmp(gsym->name(), "_GLOBAL_OFFSET_TABLE_") == 0) |
| 7853 | gold_error(_("%s: unsupported -mbss-plt code"), |
| 7854 | ppc_object->name().c_str()); |
| 7855 | break; |
| 7856 | default: |
| 7857 | break; |
| 7858 | } |
| 7859 | } |
| 7860 | |
| 7861 | switch (r_type) |
| 7862 | { |
| 7863 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 7864 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 7865 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 7866 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 7867 | case elfcpp::R_POWERPC_GOT16: |
| 7868 | case elfcpp::R_PPC64_GOT16_DS: |
| 7869 | case elfcpp::R_PPC64_TOC16: |
| 7870 | case elfcpp::R_PPC64_TOC16_DS: |
| 7871 | ppc_object->set_has_small_toc_reloc(); |
| 7872 | default: |
| 7873 | break; |
| 7874 | } |
| 7875 | } |
| 7876 | |
| 7877 | // Process relocations for gc. |
| 7878 | |
| 7879 | template<int size, bool big_endian> |
| 7880 | void |
| 7881 | Target_powerpc<size, big_endian>::gc_process_relocs( |
| 7882 | Symbol_table* symtab, |
| 7883 | Layout* layout, |
| 7884 | Sized_relobj_file<size, big_endian>* object, |
| 7885 | unsigned int data_shndx, |
| 7886 | unsigned int, |
| 7887 | const unsigned char* prelocs, |
| 7888 | size_t reloc_count, |
| 7889 | Output_section* output_section, |
| 7890 | bool needs_special_offset_handling, |
| 7891 | size_t local_symbol_count, |
| 7892 | const unsigned char* plocal_symbols) |
| 7893 | { |
| 7894 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 7895 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 7896 | Classify_reloc; |
| 7897 | |
| 7898 | Powerpc_relobj<size, big_endian>* ppc_object |
| 7899 | = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| 7900 | if (size == 64) |
| 7901 | ppc_object->set_opd_valid(); |
| 7902 | if (size == 64 && data_shndx == ppc_object->opd_shndx()) |
| 7903 | { |
| 7904 | typename Powerpc_relobj<size, big_endian>::Access_from::iterator p; |
| 7905 | for (p = ppc_object->access_from_map()->begin(); |
| 7906 | p != ppc_object->access_from_map()->end(); |
| 7907 | ++p) |
| 7908 | { |
| 7909 | Address dst_off = p->first; |
| 7910 | unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); |
| 7911 | typename Powerpc_relobj<size, big_endian>::Section_refs::iterator s; |
| 7912 | for (s = p->second.begin(); s != p->second.end(); ++s) |
| 7913 | { |
| 7914 | Relobj* src_obj = s->first; |
| 7915 | unsigned int src_indx = s->second; |
| 7916 | symtab->gc()->add_reference(src_obj, src_indx, |
| 7917 | ppc_object, dst_indx); |
| 7918 | } |
| 7919 | p->second.clear(); |
| 7920 | } |
| 7921 | ppc_object->access_from_map()->clear(); |
| 7922 | ppc_object->process_gc_mark(symtab); |
| 7923 | // Don't look at .opd relocs as .opd will reference everything. |
| 7924 | return; |
| 7925 | } |
| 7926 | |
| 7927 | gold::gc_process_relocs<size, big_endian, Powerpc, Scan, Classify_reloc>( |
| 7928 | symtab, |
| 7929 | layout, |
| 7930 | this, |
| 7931 | object, |
| 7932 | data_shndx, |
| 7933 | prelocs, |
| 7934 | reloc_count, |
| 7935 | output_section, |
| 7936 | needs_special_offset_handling, |
| 7937 | local_symbol_count, |
| 7938 | plocal_symbols); |
| 7939 | } |
| 7940 | |
| 7941 | // Handle target specific gc actions when adding a gc reference from |
| 7942 | // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX |
| 7943 | // and DST_OFF. For powerpc64, this adds a referenc to the code |
| 7944 | // section of a function descriptor. |
| 7945 | |
| 7946 | template<int size, bool big_endian> |
| 7947 | void |
| 7948 | Target_powerpc<size, big_endian>::do_gc_add_reference( |
| 7949 | Symbol_table* symtab, |
| 7950 | Relobj* src_obj, |
| 7951 | unsigned int src_shndx, |
| 7952 | Relobj* dst_obj, |
| 7953 | unsigned int dst_shndx, |
| 7954 | Address dst_off) const |
| 7955 | { |
| 7956 | if (size != 64 || dst_obj->is_dynamic()) |
| 7957 | return; |
| 7958 | |
| 7959 | Powerpc_relobj<size, big_endian>* ppc_object |
| 7960 | = static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj); |
| 7961 | if (dst_shndx != 0 && dst_shndx == ppc_object->opd_shndx()) |
| 7962 | { |
| 7963 | if (ppc_object->opd_valid()) |
| 7964 | { |
| 7965 | dst_shndx = ppc_object->get_opd_ent(dst_off); |
| 7966 | symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx); |
| 7967 | } |
| 7968 | else |
| 7969 | { |
| 7970 | // If we haven't run scan_opd_relocs, we must delay |
| 7971 | // processing this function descriptor reference. |
| 7972 | ppc_object->add_reference(src_obj, src_shndx, dst_off); |
| 7973 | } |
| 7974 | } |
| 7975 | } |
| 7976 | |
| 7977 | // Add any special sections for this symbol to the gc work list. |
| 7978 | // For powerpc64, this adds the code section of a function |
| 7979 | // descriptor. |
| 7980 | |
| 7981 | template<int size, bool big_endian> |
| 7982 | void |
| 7983 | Target_powerpc<size, big_endian>::do_gc_mark_symbol( |
| 7984 | Symbol_table* symtab, |
| 7985 | Symbol* sym) const |
| 7986 | { |
| 7987 | if (size == 64) |
| 7988 | { |
| 7989 | Powerpc_relobj<size, big_endian>* ppc_object |
| 7990 | = static_cast<Powerpc_relobj<size, big_endian>*>(sym->object()); |
| 7991 | bool is_ordinary; |
| 7992 | unsigned int shndx = sym->shndx(&is_ordinary); |
| 7993 | if (is_ordinary && shndx != 0 && shndx == ppc_object->opd_shndx()) |
| 7994 | { |
| 7995 | Sized_symbol<size>* gsym = symtab->get_sized_symbol<size>(sym); |
| 7996 | Address dst_off = gsym->value(); |
| 7997 | if (ppc_object->opd_valid()) |
| 7998 | { |
| 7999 | unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); |
| 8000 | symtab->gc()->worklist().push_back(Section_id(ppc_object, |
| 8001 | dst_indx)); |
| 8002 | } |
| 8003 | else |
| 8004 | ppc_object->add_gc_mark(dst_off); |
| 8005 | } |
| 8006 | } |
| 8007 | } |
| 8008 | |
| 8009 | // For a symbol location in .opd, set LOC to the location of the |
| 8010 | // function entry. |
| 8011 | |
| 8012 | template<int size, bool big_endian> |
| 8013 | void |
| 8014 | Target_powerpc<size, big_endian>::do_function_location( |
| 8015 | Symbol_location* loc) const |
| 8016 | { |
| 8017 | if (size == 64 && loc->shndx != 0) |
| 8018 | { |
| 8019 | if (loc->object->is_dynamic()) |
| 8020 | { |
| 8021 | Powerpc_dynobj<size, big_endian>* ppc_object |
| 8022 | = static_cast<Powerpc_dynobj<size, big_endian>*>(loc->object); |
| 8023 | if (loc->shndx == ppc_object->opd_shndx()) |
| 8024 | { |
| 8025 | Address dest_off; |
| 8026 | Address off = loc->offset - ppc_object->opd_address(); |
| 8027 | loc->shndx = ppc_object->get_opd_ent(off, &dest_off); |
| 8028 | loc->offset = dest_off; |
| 8029 | } |
| 8030 | } |
| 8031 | else |
| 8032 | { |
| 8033 | const Powerpc_relobj<size, big_endian>* ppc_object |
| 8034 | = static_cast<const Powerpc_relobj<size, big_endian>*>(loc->object); |
| 8035 | if (loc->shndx == ppc_object->opd_shndx()) |
| 8036 | { |
| 8037 | Address dest_off; |
| 8038 | loc->shndx = ppc_object->get_opd_ent(loc->offset, &dest_off); |
| 8039 | loc->offset = dest_off; |
| 8040 | } |
| 8041 | } |
| 8042 | } |
| 8043 | } |
| 8044 | |
| 8045 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
| 8046 | // compiled with -fsplit-stack. The function calls non-split-stack |
| 8047 | // code. Change the function to ensure it has enough stack space to |
| 8048 | // call some random function. |
| 8049 | |
| 8050 | template<int size, bool big_endian> |
| 8051 | void |
| 8052 | Target_powerpc<size, big_endian>::do_calls_non_split( |
| 8053 | Relobj* object, |
| 8054 | unsigned int shndx, |
| 8055 | section_offset_type fnoffset, |
| 8056 | section_size_type fnsize, |
| 8057 | const unsigned char* prelocs, |
| 8058 | size_t reloc_count, |
| 8059 | unsigned char* view, |
| 8060 | section_size_type view_size, |
| 8061 | std::string* from, |
| 8062 | std::string* to) const |
| 8063 | { |
| 8064 | // 32-bit not supported. |
| 8065 | if (size == 32) |
| 8066 | { |
| 8067 | // warn |
| 8068 | Target::do_calls_non_split(object, shndx, fnoffset, fnsize, |
| 8069 | prelocs, reloc_count, view, view_size, |
| 8070 | from, to); |
| 8071 | return; |
| 8072 | } |
| 8073 | |
| 8074 | // The function always starts with |
| 8075 | // ld %r0,-0x7000-64(%r13) # tcbhead_t.__private_ss |
| 8076 | // addis %r12,%r1,-allocate@ha |
| 8077 | // addi %r12,%r12,-allocate@l |
| 8078 | // cmpld %r12,%r0 |
| 8079 | // but note that the addis or addi may be replaced with a nop |
| 8080 | |
| 8081 | unsigned char *entry = view + fnoffset; |
| 8082 | uint32_t insn = elfcpp::Swap<32, big_endian>::readval(entry); |
| 8083 | |
| 8084 | if ((insn & 0xffff0000) == addis_2_12) |
| 8085 | { |
| 8086 | /* Skip ELFv2 global entry code. */ |
| 8087 | entry += 8; |
| 8088 | insn = elfcpp::Swap<32, big_endian>::readval(entry); |
| 8089 | } |
| 8090 | |
| 8091 | unsigned char *pinsn = entry; |
| 8092 | bool ok = false; |
| 8093 | const uint32_t ld_private_ss = 0xe80d8fc0; |
| 8094 | if (insn == ld_private_ss) |
| 8095 | { |
| 8096 | int32_t allocate = 0; |
| 8097 | while (1) |
| 8098 | { |
| 8099 | pinsn += 4; |
| 8100 | insn = elfcpp::Swap<32, big_endian>::readval(pinsn); |
| 8101 | if ((insn & 0xffff0000) == addis_12_1) |
| 8102 | allocate += (insn & 0xffff) << 16; |
| 8103 | else if ((insn & 0xffff0000) == addi_12_1 |
| 8104 | || (insn & 0xffff0000) == addi_12_12) |
| 8105 | allocate += ((insn & 0xffff) ^ 0x8000) - 0x8000; |
| 8106 | else if (insn != nop) |
| 8107 | break; |
| 8108 | } |
| 8109 | if (insn == cmpld_7_12_0 && pinsn == entry + 12) |
| 8110 | { |
| 8111 | int extra = parameters->options().split_stack_adjust_size(); |
| 8112 | allocate -= extra; |
| 8113 | if (allocate >= 0 || extra < 0) |
| 8114 | { |
| 8115 | object->error(_("split-stack stack size overflow at " |
| 8116 | "section %u offset %0zx"), |
| 8117 | shndx, static_cast<size_t>(fnoffset)); |
| 8118 | return; |
| 8119 | } |
| 8120 | pinsn = entry + 4; |
| 8121 | insn = addis_12_1 | (((allocate + 0x8000) >> 16) & 0xffff); |
| 8122 | if (insn != addis_12_1) |
| 8123 | { |
| 8124 | elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); |
| 8125 | pinsn += 4; |
| 8126 | insn = addi_12_12 | (allocate & 0xffff); |
| 8127 | if (insn != addi_12_12) |
| 8128 | { |
| 8129 | elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); |
| 8130 | pinsn += 4; |
| 8131 | } |
| 8132 | } |
| 8133 | else |
| 8134 | { |
| 8135 | insn = addi_12_1 | (allocate & 0xffff); |
| 8136 | elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); |
| 8137 | pinsn += 4; |
| 8138 | } |
| 8139 | if (pinsn != entry + 12) |
| 8140 | elfcpp::Swap<32, big_endian>::writeval(pinsn, nop); |
| 8141 | |
| 8142 | ok = true; |
| 8143 | } |
| 8144 | } |
| 8145 | |
| 8146 | if (!ok) |
| 8147 | { |
| 8148 | if (!object->has_no_split_stack()) |
| 8149 | object->error(_("failed to match split-stack sequence at " |
| 8150 | "section %u offset %0zx"), |
| 8151 | shndx, static_cast<size_t>(fnoffset)); |
| 8152 | } |
| 8153 | } |
| 8154 | |
| 8155 | // Scan relocations for a section. |
| 8156 | |
| 8157 | template<int size, bool big_endian> |
| 8158 | void |
| 8159 | Target_powerpc<size, big_endian>::scan_relocs( |
| 8160 | Symbol_table* symtab, |
| 8161 | Layout* layout, |
| 8162 | Sized_relobj_file<size, big_endian>* object, |
| 8163 | unsigned int data_shndx, |
| 8164 | unsigned int sh_type, |
| 8165 | const unsigned char* prelocs, |
| 8166 | size_t reloc_count, |
| 8167 | Output_section* output_section, |
| 8168 | bool needs_special_offset_handling, |
| 8169 | size_t local_symbol_count, |
| 8170 | const unsigned char* plocal_symbols) |
| 8171 | { |
| 8172 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 8173 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 8174 | Classify_reloc; |
| 8175 | |
| 8176 | if (!this->plt_localentry0_init_) |
| 8177 | { |
| 8178 | bool plt_localentry0 = false; |
| 8179 | if (size == 64 |
| 8180 | && this->abiversion() >= 2) |
| 8181 | { |
| 8182 | if (parameters->options().user_set_plt_localentry()) |
| 8183 | plt_localentry0 = parameters->options().plt_localentry(); |
| 8184 | if (plt_localentry0 |
| 8185 | && symtab->lookup("GLIBC_2.26", NULL) == NULL) |
| 8186 | gold_warning(_("--plt-localentry is especially dangerous without " |
| 8187 | "ld.so support to detect ABI violations")); |
| 8188 | } |
| 8189 | this->plt_localentry0_ = plt_localentry0; |
| 8190 | this->plt_localentry0_init_ = true; |
| 8191 | } |
| 8192 | |
| 8193 | if (sh_type == elfcpp::SHT_REL) |
| 8194 | { |
| 8195 | gold_error(_("%s: unsupported REL reloc section"), |
| 8196 | object->name().c_str()); |
| 8197 | return; |
| 8198 | } |
| 8199 | |
| 8200 | gold::scan_relocs<size, big_endian, Powerpc, Scan, Classify_reloc>( |
| 8201 | symtab, |
| 8202 | layout, |
| 8203 | this, |
| 8204 | object, |
| 8205 | data_shndx, |
| 8206 | prelocs, |
| 8207 | reloc_count, |
| 8208 | output_section, |
| 8209 | needs_special_offset_handling, |
| 8210 | local_symbol_count, |
| 8211 | plocal_symbols); |
| 8212 | } |
| 8213 | |
| 8214 | // Functor class for processing the global symbol table. |
| 8215 | // Removes symbols defined on discarded opd entries. |
| 8216 | |
| 8217 | template<bool big_endian> |
| 8218 | class Global_symbol_visitor_opd |
| 8219 | { |
| 8220 | public: |
| 8221 | Global_symbol_visitor_opd() |
| 8222 | { } |
| 8223 | |
| 8224 | void |
| 8225 | operator()(Sized_symbol<64>* sym) |
| 8226 | { |
| 8227 | if (sym->has_symtab_index() |
| 8228 | || sym->source() != Symbol::FROM_OBJECT |
| 8229 | || !sym->in_real_elf()) |
| 8230 | return; |
| 8231 | |
| 8232 | if (sym->object()->is_dynamic()) |
| 8233 | return; |
| 8234 | |
| 8235 | Powerpc_relobj<64, big_endian>* symobj |
| 8236 | = static_cast<Powerpc_relobj<64, big_endian>*>(sym->object()); |
| 8237 | if (symobj->opd_shndx() == 0) |
| 8238 | return; |
| 8239 | |
| 8240 | bool is_ordinary; |
| 8241 | unsigned int shndx = sym->shndx(&is_ordinary); |
| 8242 | if (shndx == symobj->opd_shndx() |
| 8243 | && symobj->get_opd_discard(sym->value())) |
| 8244 | { |
| 8245 | sym->set_undefined(); |
| 8246 | sym->set_visibility(elfcpp::STV_DEFAULT); |
| 8247 | sym->set_is_defined_in_discarded_section(); |
| 8248 | sym->set_symtab_index(-1U); |
| 8249 | } |
| 8250 | } |
| 8251 | }; |
| 8252 | |
| 8253 | template<int size, bool big_endian> |
| 8254 | void |
| 8255 | Target_powerpc<size, big_endian>::define_save_restore_funcs( |
| 8256 | Layout* layout, |
| 8257 | Symbol_table* symtab) |
| 8258 | { |
| 8259 | if (size == 64) |
| 8260 | { |
| 8261 | Output_data_save_res<size, big_endian>* savres |
| 8262 | = new Output_data_save_res<size, big_endian>(symtab); |
| 8263 | this->savres_section_ = savres; |
| 8264 | layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, |
| 8265 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, |
| 8266 | savres, ORDER_TEXT, false); |
| 8267 | } |
| 8268 | } |
| 8269 | |
| 8270 | // Sort linker created .got section first (for the header), then input |
| 8271 | // sections belonging to files using small model code. |
| 8272 | |
| 8273 | template<bool big_endian> |
| 8274 | class Sort_toc_sections |
| 8275 | { |
| 8276 | public: |
| 8277 | bool |
| 8278 | operator()(const Output_section::Input_section& is1, |
| 8279 | const Output_section::Input_section& is2) const |
| 8280 | { |
| 8281 | if (!is1.is_input_section() && is2.is_input_section()) |
| 8282 | return true; |
| 8283 | bool small1 |
| 8284 | = (is1.is_input_section() |
| 8285 | && (static_cast<const Powerpc_relobj<64, big_endian>*>(is1.relobj()) |
| 8286 | ->has_small_toc_reloc())); |
| 8287 | bool small2 |
| 8288 | = (is2.is_input_section() |
| 8289 | && (static_cast<const Powerpc_relobj<64, big_endian>*>(is2.relobj()) |
| 8290 | ->has_small_toc_reloc())); |
| 8291 | return small1 && !small2; |
| 8292 | } |
| 8293 | }; |
| 8294 | |
| 8295 | // Finalize the sections. |
| 8296 | |
| 8297 | template<int size, bool big_endian> |
| 8298 | void |
| 8299 | Target_powerpc<size, big_endian>::do_finalize_sections( |
| 8300 | Layout* layout, |
| 8301 | const Input_objects*, |
| 8302 | Symbol_table* symtab) |
| 8303 | { |
| 8304 | if (parameters->doing_static_link()) |
| 8305 | { |
| 8306 | // At least some versions of glibc elf-init.o have a strong |
| 8307 | // reference to __rela_iplt marker syms. A weak ref would be |
| 8308 | // better.. |
| 8309 | if (this->iplt_ != NULL) |
| 8310 | { |
| 8311 | Reloc_section* rel = this->iplt_->rel_plt(); |
| 8312 | symtab->define_in_output_data("__rela_iplt_start", NULL, |
| 8313 | Symbol_table::PREDEFINED, rel, 0, 0, |
| 8314 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 8315 | elfcpp::STV_HIDDEN, 0, false, true); |
| 8316 | symtab->define_in_output_data("__rela_iplt_end", NULL, |
| 8317 | Symbol_table::PREDEFINED, rel, 0, 0, |
| 8318 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 8319 | elfcpp::STV_HIDDEN, 0, true, true); |
| 8320 | } |
| 8321 | else |
| 8322 | { |
| 8323 | symtab->define_as_constant("__rela_iplt_start", NULL, |
| 8324 | Symbol_table::PREDEFINED, 0, 0, |
| 8325 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 8326 | elfcpp::STV_HIDDEN, 0, true, false); |
| 8327 | symtab->define_as_constant("__rela_iplt_end", NULL, |
| 8328 | Symbol_table::PREDEFINED, 0, 0, |
| 8329 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 8330 | elfcpp::STV_HIDDEN, 0, true, false); |
| 8331 | } |
| 8332 | } |
| 8333 | |
| 8334 | if (size == 64) |
| 8335 | { |
| 8336 | typedef Global_symbol_visitor_opd<big_endian> Symbol_visitor; |
| 8337 | symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor()); |
| 8338 | |
| 8339 | if (!parameters->options().relocatable()) |
| 8340 | { |
| 8341 | this->define_save_restore_funcs(layout, symtab); |
| 8342 | |
| 8343 | // Annoyingly, we need to make these sections now whether or |
| 8344 | // not we need them. If we delay until do_relax then we |
| 8345 | // need to mess with the relaxation machinery checkpointing. |
| 8346 | this->got_section(symtab, layout); |
| 8347 | this->make_brlt_section(layout); |
| 8348 | |
| 8349 | if (parameters->options().toc_sort()) |
| 8350 | { |
| 8351 | Output_section* os = this->got_->output_section(); |
| 8352 | if (os != NULL && os->input_sections().size() > 1) |
| 8353 | std::stable_sort(os->input_sections().begin(), |
| 8354 | os->input_sections().end(), |
| 8355 | Sort_toc_sections<big_endian>()); |
| 8356 | } |
| 8357 | } |
| 8358 | } |
| 8359 | |
| 8360 | // Fill in some more dynamic tags. |
| 8361 | Output_data_dynamic* odyn = layout->dynamic_data(); |
| 8362 | if (odyn != NULL) |
| 8363 | { |
| 8364 | const Reloc_section* rel_plt = (this->plt_ == NULL |
| 8365 | ? NULL |
| 8366 | : this->plt_->rel_plt()); |
| 8367 | layout->add_target_dynamic_tags(false, this->plt_, rel_plt, |
| 8368 | this->rela_dyn_, true, size == 32); |
| 8369 | |
| 8370 | if (size == 32) |
| 8371 | { |
| 8372 | if (this->got_ != NULL) |
| 8373 | { |
| 8374 | this->got_->finalize_data_size(); |
| 8375 | odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT, |
| 8376 | this->got_, this->got_->g_o_t()); |
| 8377 | } |
| 8378 | if (this->has_tls_get_addr_opt_) |
| 8379 | odyn->add_constant(elfcpp::DT_PPC_OPT, elfcpp::PPC_OPT_TLS); |
| 8380 | } |
| 8381 | else |
| 8382 | { |
| 8383 | if (this->glink_ != NULL) |
| 8384 | { |
| 8385 | this->glink_->finalize_data_size(); |
| 8386 | odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK, |
| 8387 | this->glink_, |
| 8388 | (this->glink_->pltresolve_size() |
| 8389 | - 32)); |
| 8390 | } |
| 8391 | if (this->has_localentry0_ || this->has_tls_get_addr_opt_) |
| 8392 | odyn->add_constant(elfcpp::DT_PPC64_OPT, |
| 8393 | ((this->has_localentry0_ |
| 8394 | ? elfcpp::PPC64_OPT_LOCALENTRY : 0) |
| 8395 | | (this->has_tls_get_addr_opt_ |
| 8396 | ? elfcpp::PPC64_OPT_TLS : 0))); |
| 8397 | } |
| 8398 | } |
| 8399 | |
| 8400 | // Emit any relocs we saved in an attempt to avoid generating COPY |
| 8401 | // relocs. |
| 8402 | if (this->copy_relocs_.any_saved_relocs()) |
| 8403 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); |
| 8404 | } |
| 8405 | |
| 8406 | // Emit any saved relocs, and mark toc entries using any of these |
| 8407 | // relocs as not optimizable. |
| 8408 | |
| 8409 | template<int sh_type, int size, bool big_endian> |
| 8410 | void |
| 8411 | Powerpc_copy_relocs<sh_type, size, big_endian>::emit( |
| 8412 | Output_data_reloc<sh_type, true, size, big_endian>* reloc_section) |
| 8413 | { |
| 8414 | if (size == 64 |
| 8415 | && parameters->options().toc_optimize()) |
| 8416 | { |
| 8417 | for (typename Copy_relocs<sh_type, size, big_endian>:: |
| 8418 | Copy_reloc_entries::iterator p = this->entries_.begin(); |
| 8419 | p != this->entries_.end(); |
| 8420 | ++p) |
| 8421 | { |
| 8422 | typename Copy_relocs<sh_type, size, big_endian>::Copy_reloc_entry& |
| 8423 | entry = *p; |
| 8424 | |
| 8425 | // If the symbol is no longer defined in a dynamic object, |
| 8426 | // then we emitted a COPY relocation. If it is still |
| 8427 | // dynamic then we'll need dynamic relocations and thus |
| 8428 | // can't optimize toc entries. |
| 8429 | if (entry.sym_->is_from_dynobj()) |
| 8430 | { |
| 8431 | Powerpc_relobj<size, big_endian>* ppc_object |
| 8432 | = static_cast<Powerpc_relobj<size, big_endian>*>(entry.relobj_); |
| 8433 | if (entry.shndx_ == ppc_object->toc_shndx()) |
| 8434 | ppc_object->set_no_toc_opt(entry.address_); |
| 8435 | } |
| 8436 | } |
| 8437 | } |
| 8438 | |
| 8439 | Copy_relocs<sh_type, size, big_endian>::emit(reloc_section); |
| 8440 | } |
| 8441 | |
| 8442 | // Return the value to use for a branch relocation. |
| 8443 | |
| 8444 | template<int size, bool big_endian> |
| 8445 | bool |
| 8446 | Target_powerpc<size, big_endian>::symval_for_branch( |
| 8447 | const Symbol_table* symtab, |
| 8448 | const Sized_symbol<size>* gsym, |
| 8449 | Powerpc_relobj<size, big_endian>* object, |
| 8450 | Address *value, |
| 8451 | unsigned int *dest_shndx) |
| 8452 | { |
| 8453 | if (size == 32 || this->abiversion() >= 2) |
| 8454 | gold_unreachable(); |
| 8455 | *dest_shndx = 0; |
| 8456 | |
| 8457 | // If the symbol is defined in an opd section, ie. is a function |
| 8458 | // descriptor, use the function descriptor code entry address |
| 8459 | Powerpc_relobj<size, big_endian>* symobj = object; |
| 8460 | if (gsym != NULL |
| 8461 | && (gsym->source() != Symbol::FROM_OBJECT |
| 8462 | || gsym->object()->is_dynamic())) |
| 8463 | return true; |
| 8464 | if (gsym != NULL) |
| 8465 | symobj = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object()); |
| 8466 | unsigned int shndx = symobj->opd_shndx(); |
| 8467 | if (shndx == 0) |
| 8468 | return true; |
| 8469 | Address opd_addr = symobj->get_output_section_offset(shndx); |
| 8470 | if (opd_addr == invalid_address) |
| 8471 | return true; |
| 8472 | opd_addr += symobj->output_section_address(shndx); |
| 8473 | if (*value >= opd_addr && *value < opd_addr + symobj->section_size(shndx)) |
| 8474 | { |
| 8475 | Address sec_off; |
| 8476 | *dest_shndx = symobj->get_opd_ent(*value - opd_addr, &sec_off); |
| 8477 | if (symtab->is_section_folded(symobj, *dest_shndx)) |
| 8478 | { |
| 8479 | Section_id folded |
| 8480 | = symtab->icf()->get_folded_section(symobj, *dest_shndx); |
| 8481 | symobj = static_cast<Powerpc_relobj<size, big_endian>*>(folded.first); |
| 8482 | *dest_shndx = folded.second; |
| 8483 | } |
| 8484 | Address sec_addr = symobj->get_output_section_offset(*dest_shndx); |
| 8485 | if (sec_addr == invalid_address) |
| 8486 | return false; |
| 8487 | |
| 8488 | sec_addr += symobj->output_section(*dest_shndx)->address(); |
| 8489 | *value = sec_addr + sec_off; |
| 8490 | } |
| 8491 | return true; |
| 8492 | } |
| 8493 | |
| 8494 | // Perform a relocation. |
| 8495 | |
| 8496 | template<int size, bool big_endian> |
| 8497 | inline bool |
| 8498 | Target_powerpc<size, big_endian>::Relocate::relocate( |
| 8499 | const Relocate_info<size, big_endian>* relinfo, |
| 8500 | unsigned int, |
| 8501 | Target_powerpc* target, |
| 8502 | Output_section* os, |
| 8503 | size_t relnum, |
| 8504 | const unsigned char* preloc, |
| 8505 | const Sized_symbol<size>* gsym, |
| 8506 | const Symbol_value<size>* psymval, |
| 8507 | unsigned char* view, |
| 8508 | Address address, |
| 8509 | section_size_type view_size) |
| 8510 | { |
| 8511 | typedef Powerpc_relocate_functions<size, big_endian> Reloc; |
| 8512 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn; |
| 8513 | typedef typename elfcpp::Rela<size, big_endian> Reltype; |
| 8514 | |
| 8515 | if (view == NULL) |
| 8516 | return true; |
| 8517 | |
| 8518 | if (target->replace_tls_get_addr(gsym)) |
| 8519 | gsym = static_cast<const Sized_symbol<size>*>(target->tls_get_addr_opt()); |
| 8520 | |
| 8521 | const elfcpp::Rela<size, big_endian> rela(preloc); |
| 8522 | unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info()); |
| 8523 | switch (this->maybe_skip_tls_get_addr_call(target, r_type, gsym)) |
| 8524 | { |
| 8525 | case Track_tls::NOT_EXPECTED: |
| 8526 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 8527 | _("__tls_get_addr call lacks marker reloc")); |
| 8528 | break; |
| 8529 | case Track_tls::EXPECTED: |
| 8530 | // We have already complained. |
| 8531 | break; |
| 8532 | case Track_tls::SKIP: |
| 8533 | if (is_plt16_reloc<size>(r_type) |
| 8534 | || r_type == elfcpp::R_POWERPC_PLTSEQ) |
| 8535 | { |
| 8536 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 8537 | elfcpp::Swap<32, big_endian>::writeval(iview, nop); |
| 8538 | } |
| 8539 | else if (size == 64 && r_type == elfcpp::R_POWERPC_PLTCALL) |
| 8540 | { |
| 8541 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 8542 | elfcpp::Swap<32, big_endian>::writeval(iview + 1, nop); |
| 8543 | } |
| 8544 | return true; |
| 8545 | case Track_tls::NORMAL: |
| 8546 | break; |
| 8547 | } |
| 8548 | |
| 8549 | // Offset from start of insn to d-field reloc. |
| 8550 | const int d_offset = big_endian ? 2 : 0; |
| 8551 | |
| 8552 | Powerpc_relobj<size, big_endian>* const object |
| 8553 | = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); |
| 8554 | Address value = 0; |
| 8555 | bool has_stub_value = false; |
| 8556 | bool localentry0 = false; |
| 8557 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 8558 | bool has_plt_offset |
| 8559 | = (gsym != NULL |
| 8560 | ? gsym->use_plt_offset(Scan::get_reference_flags(r_type, target)) |
| 8561 | : object->local_has_plt_offset(r_sym)); |
| 8562 | if (has_plt_offset |
| 8563 | && !is_plt16_reloc<size>(r_type) |
| 8564 | && r_type != elfcpp::R_POWERPC_PLTSEQ |
| 8565 | && r_type != elfcpp::R_POWERPC_PLTCALL |
| 8566 | && (!psymval->is_ifunc_symbol() |
| 8567 | || Scan::reloc_needs_plt_for_ifunc(target, object, r_type, false))) |
| 8568 | { |
| 8569 | if (size == 64 |
| 8570 | && gsym != NULL |
| 8571 | && target->abiversion() >= 2 |
| 8572 | && !parameters->options().output_is_position_independent() |
| 8573 | && !is_branch_reloc(r_type)) |
| 8574 | { |
| 8575 | Address off = target->glink_section()->find_global_entry(gsym); |
| 8576 | if (off != invalid_address) |
| 8577 | { |
| 8578 | value = target->glink_section()->global_entry_address() + off; |
| 8579 | has_stub_value = true; |
| 8580 | } |
| 8581 | } |
| 8582 | else |
| 8583 | { |
| 8584 | Stub_table<size, big_endian>* stub_table = NULL; |
| 8585 | if (target->stub_tables().size() == 1) |
| 8586 | stub_table = target->stub_tables()[0]; |
| 8587 | if (stub_table == NULL |
| 8588 | && !(size == 32 |
| 8589 | && gsym != NULL |
| 8590 | && !parameters->options().output_is_position_independent() |
| 8591 | && !is_branch_reloc(r_type))) |
| 8592 | stub_table = object->stub_table(relinfo->data_shndx); |
| 8593 | if (stub_table == NULL) |
| 8594 | { |
| 8595 | // This is a ref from a data section to an ifunc symbol, |
| 8596 | // or a non-branch reloc for which we always want to use |
| 8597 | // one set of stubs for resolving function addresses. |
| 8598 | if (target->stub_tables().size() != 0) |
| 8599 | stub_table = target->stub_tables()[0]; |
| 8600 | } |
| 8601 | if (stub_table != NULL) |
| 8602 | { |
| 8603 | const typename Stub_table<size, big_endian>::Plt_stub_ent* ent; |
| 8604 | if (gsym != NULL) |
| 8605 | ent = stub_table->find_plt_call_entry(object, gsym, r_type, |
| 8606 | rela.get_r_addend()); |
| 8607 | else |
| 8608 | ent = stub_table->find_plt_call_entry(object, r_sym, r_type, |
| 8609 | rela.get_r_addend()); |
| 8610 | if (ent != NULL) |
| 8611 | { |
| 8612 | value = stub_table->stub_address() + ent->off_; |
| 8613 | const int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 8614 | elfcpp::Shdr<size, big_endian> shdr(relinfo->reloc_shdr); |
| 8615 | size_t reloc_count = shdr.get_sh_size() / reloc_size; |
| 8616 | if (size == 64 |
| 8617 | && ent->r2save_ |
| 8618 | && relnum + 1 < reloc_count) |
| 8619 | { |
| 8620 | Reltype next_rela(preloc + reloc_size); |
| 8621 | if (elfcpp::elf_r_type<size>(next_rela.get_r_info()) |
| 8622 | == elfcpp::R_PPC64_TOCSAVE |
| 8623 | && next_rela.get_r_offset() == rela.get_r_offset() + 4) |
| 8624 | value += 4; |
| 8625 | } |
| 8626 | localentry0 = ent->localentry0_; |
| 8627 | has_stub_value = true; |
| 8628 | } |
| 8629 | } |
| 8630 | } |
| 8631 | // We don't care too much about bogus debug references to |
| 8632 | // non-local functions, but otherwise there had better be a plt |
| 8633 | // call stub or global entry stub as appropriate. |
| 8634 | gold_assert(has_stub_value || !(os->flags() & elfcpp::SHF_ALLOC)); |
| 8635 | } |
| 8636 | |
| 8637 | if (has_plt_offset && is_plt16_reloc<size>(r_type)) |
| 8638 | { |
| 8639 | const Output_data_plt_powerpc<size, big_endian>* plt; |
| 8640 | if (gsym) |
| 8641 | value = target->plt_off(gsym, &plt); |
| 8642 | else |
| 8643 | value = target->plt_off(object, r_sym, &plt); |
| 8644 | value += plt->address(); |
| 8645 | |
| 8646 | if (size == 64) |
| 8647 | value -= (target->got_section()->output_section()->address() |
| 8648 | + object->toc_base_offset()); |
| 8649 | else if (parameters->options().output_is_position_independent()) |
| 8650 | { |
| 8651 | if (rela.get_r_addend() >= 32768) |
| 8652 | { |
| 8653 | unsigned int got2 = object->got2_shndx(); |
| 8654 | value -= (object->get_output_section_offset(got2) |
| 8655 | + object->output_section(got2)->address() |
| 8656 | + rela.get_r_addend()); |
| 8657 | } |
| 8658 | else |
| 8659 | value -= (target->got_section()->address() |
| 8660 | + target->got_section()->g_o_t()); |
| 8661 | } |
| 8662 | } |
| 8663 | else if (!has_plt_offset |
| 8664 | && (is_plt16_reloc<size>(r_type) |
| 8665 | || r_type == elfcpp::R_POWERPC_PLTSEQ)) |
| 8666 | { |
| 8667 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 8668 | elfcpp::Swap<32, big_endian>::writeval(iview, nop); |
| 8669 | r_type = elfcpp::R_POWERPC_NONE; |
| 8670 | } |
| 8671 | else if (r_type == elfcpp::R_POWERPC_GOT16 |
| 8672 | || r_type == elfcpp::R_POWERPC_GOT16_LO |
| 8673 | || r_type == elfcpp::R_POWERPC_GOT16_HI |
| 8674 | || r_type == elfcpp::R_POWERPC_GOT16_HA |
| 8675 | || r_type == elfcpp::R_PPC64_GOT16_DS |
| 8676 | || r_type == elfcpp::R_PPC64_GOT16_LO_DS) |
| 8677 | { |
| 8678 | if (gsym != NULL) |
| 8679 | { |
| 8680 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| 8681 | value = gsym->got_offset(GOT_TYPE_STANDARD); |
| 8682 | } |
| 8683 | else |
| 8684 | { |
| 8685 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
| 8686 | value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); |
| 8687 | } |
| 8688 | value -= target->got_section()->got_base_offset(object); |
| 8689 | } |
| 8690 | else if (r_type == elfcpp::R_PPC64_TOC) |
| 8691 | { |
| 8692 | value = (target->got_section()->output_section()->address() |
| 8693 | + object->toc_base_offset()); |
| 8694 | } |
| 8695 | else if (gsym != NULL |
| 8696 | && (r_type == elfcpp::R_POWERPC_REL24 |
| 8697 | || r_type == elfcpp::R_PPC_PLTREL24) |
| 8698 | && has_stub_value) |
| 8699 | { |
| 8700 | if (size == 64) |
| 8701 | { |
| 8702 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| 8703 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 8704 | bool can_plt_call = localentry0 || target->is_tls_get_addr_opt(gsym); |
| 8705 | if (!can_plt_call && rela.get_r_offset() + 8 <= view_size) |
| 8706 | { |
| 8707 | Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv); |
| 8708 | Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1); |
| 8709 | if ((insn & 1) != 0 |
| 8710 | && (insn2 == nop |
| 8711 | || insn2 == cror_15_15_15 || insn2 == cror_31_31_31)) |
| 8712 | { |
| 8713 | elfcpp::Swap<32, big_endian>:: |
| 8714 | writeval(wv + 1, ld_2_1 + target->stk_toc()); |
| 8715 | can_plt_call = true; |
| 8716 | } |
| 8717 | } |
| 8718 | if (!can_plt_call) |
| 8719 | { |
| 8720 | // If we don't have a branch and link followed by a nop, |
| 8721 | // we can't go via the plt because there is no place to |
| 8722 | // put a toc restoring instruction. |
| 8723 | // Unless we know we won't be returning. |
| 8724 | if (strcmp(gsym->name(), "__libc_start_main") == 0) |
| 8725 | can_plt_call = true; |
| 8726 | } |
| 8727 | if (!can_plt_call) |
| 8728 | { |
| 8729 | // g++ as of 20130507 emits self-calls without a |
| 8730 | // following nop. This is arguably wrong since we have |
| 8731 | // conflicting information. On the one hand a global |
| 8732 | // symbol and on the other a local call sequence, but |
| 8733 | // don't error for this special case. |
| 8734 | // It isn't possible to cheaply verify we have exactly |
| 8735 | // such a call. Allow all calls to the same section. |
| 8736 | bool ok = false; |
| 8737 | Address code = value; |
| 8738 | if (gsym->source() == Symbol::FROM_OBJECT |
| 8739 | && gsym->object() == object) |
| 8740 | { |
| 8741 | unsigned int dest_shndx = 0; |
| 8742 | if (target->abiversion() < 2) |
| 8743 | { |
| 8744 | Address addend = rela.get_r_addend(); |
| 8745 | code = psymval->value(object, addend); |
| 8746 | target->symval_for_branch(relinfo->symtab, gsym, object, |
| 8747 | &code, &dest_shndx); |
| 8748 | } |
| 8749 | bool is_ordinary; |
| 8750 | if (dest_shndx == 0) |
| 8751 | dest_shndx = gsym->shndx(&is_ordinary); |
| 8752 | ok = dest_shndx == relinfo->data_shndx; |
| 8753 | } |
| 8754 | if (!ok) |
| 8755 | { |
| 8756 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 8757 | _("call lacks nop, can't restore toc; " |
| 8758 | "recompile with -fPIC")); |
| 8759 | value = code; |
| 8760 | } |
| 8761 | } |
| 8762 | } |
| 8763 | } |
| 8764 | else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 8765 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO |
| 8766 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI |
| 8767 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) |
| 8768 | { |
| 8769 | // First instruction of a global dynamic sequence, arg setup insn. |
| 8770 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8771 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 8772 | enum Got_type got_type = GOT_TYPE_STANDARD; |
| 8773 | if (tls_type == tls::TLSOPT_NONE) |
| 8774 | got_type = GOT_TYPE_TLSGD; |
| 8775 | else if (tls_type == tls::TLSOPT_TO_IE) |
| 8776 | got_type = GOT_TYPE_TPREL; |
| 8777 | if (got_type != GOT_TYPE_STANDARD) |
| 8778 | { |
| 8779 | if (gsym != NULL) |
| 8780 | { |
| 8781 | gold_assert(gsym->has_got_offset(got_type)); |
| 8782 | value = gsym->got_offset(got_type); |
| 8783 | } |
| 8784 | else |
| 8785 | { |
| 8786 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
| 8787 | value = object->local_got_offset(r_sym, got_type); |
| 8788 | } |
| 8789 | value -= target->got_section()->got_base_offset(object); |
| 8790 | } |
| 8791 | if (tls_type == tls::TLSOPT_TO_IE) |
| 8792 | { |
| 8793 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 8794 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| 8795 | { |
| 8796 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 8797 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 8798 | insn &= (1 << 26) - (1 << 16); // extract rt,ra from addi |
| 8799 | if (size == 32) |
| 8800 | insn |= 32 << 26; // lwz |
| 8801 | else |
| 8802 | insn |= 58 << 26; // ld |
| 8803 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8804 | } |
| 8805 | r_type += (elfcpp::R_POWERPC_GOT_TPREL16 |
| 8806 | - elfcpp::R_POWERPC_GOT_TLSGD16); |
| 8807 | } |
| 8808 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 8809 | { |
| 8810 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 8811 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| 8812 | { |
| 8813 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 8814 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 8815 | insn &= (1 << 26) - (1 << 21); // extract rt |
| 8816 | if (size == 32) |
| 8817 | insn |= addis_0_2; |
| 8818 | else |
| 8819 | insn |= addis_0_13; |
| 8820 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8821 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 8822 | value = psymval->value(object, rela.get_r_addend()); |
| 8823 | } |
| 8824 | else |
| 8825 | { |
| 8826 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 8827 | Insn insn = nop; |
| 8828 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8829 | r_type = elfcpp::R_POWERPC_NONE; |
| 8830 | } |
| 8831 | } |
| 8832 | } |
| 8833 | else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 8834 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO |
| 8835 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI |
| 8836 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) |
| 8837 | { |
| 8838 | // First instruction of a local dynamic sequence, arg setup insn. |
| 8839 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 8840 | if (tls_type == tls::TLSOPT_NONE) |
| 8841 | { |
| 8842 | value = target->tlsld_got_offset(); |
| 8843 | value -= target->got_section()->got_base_offset(object); |
| 8844 | } |
| 8845 | else |
| 8846 | { |
| 8847 | gold_assert(tls_type == tls::TLSOPT_TO_LE); |
| 8848 | if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 8849 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) |
| 8850 | { |
| 8851 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 8852 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 8853 | insn &= (1 << 26) - (1 << 21); // extract rt |
| 8854 | if (size == 32) |
| 8855 | insn |= addis_0_2; |
| 8856 | else |
| 8857 | insn |= addis_0_13; |
| 8858 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8859 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 8860 | value = dtp_offset; |
| 8861 | } |
| 8862 | else |
| 8863 | { |
| 8864 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 8865 | Insn insn = nop; |
| 8866 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8867 | r_type = elfcpp::R_POWERPC_NONE; |
| 8868 | } |
| 8869 | } |
| 8870 | } |
| 8871 | else if (r_type == elfcpp::R_POWERPC_GOT_DTPREL16 |
| 8872 | || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_LO |
| 8873 | || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HI |
| 8874 | || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HA) |
| 8875 | { |
| 8876 | // Accesses relative to a local dynamic sequence address, |
| 8877 | // no optimisation here. |
| 8878 | if (gsym != NULL) |
| 8879 | { |
| 8880 | gold_assert(gsym->has_got_offset(GOT_TYPE_DTPREL)); |
| 8881 | value = gsym->got_offset(GOT_TYPE_DTPREL); |
| 8882 | } |
| 8883 | else |
| 8884 | { |
| 8885 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_DTPREL)); |
| 8886 | value = object->local_got_offset(r_sym, GOT_TYPE_DTPREL); |
| 8887 | } |
| 8888 | value -= target->got_section()->got_base_offset(object); |
| 8889 | } |
| 8890 | else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 8891 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO |
| 8892 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI |
| 8893 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) |
| 8894 | { |
| 8895 | // First instruction of initial exec sequence. |
| 8896 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8897 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| 8898 | if (tls_type == tls::TLSOPT_NONE) |
| 8899 | { |
| 8900 | if (gsym != NULL) |
| 8901 | { |
| 8902 | gold_assert(gsym->has_got_offset(GOT_TYPE_TPREL)); |
| 8903 | value = gsym->got_offset(GOT_TYPE_TPREL); |
| 8904 | } |
| 8905 | else |
| 8906 | { |
| 8907 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)); |
| 8908 | value = object->local_got_offset(r_sym, GOT_TYPE_TPREL); |
| 8909 | } |
| 8910 | value -= target->got_section()->got_base_offset(object); |
| 8911 | } |
| 8912 | else |
| 8913 | { |
| 8914 | gold_assert(tls_type == tls::TLSOPT_TO_LE); |
| 8915 | if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 8916 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) |
| 8917 | { |
| 8918 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 8919 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 8920 | insn &= (1 << 26) - (1 << 21); // extract rt from ld |
| 8921 | if (size == 32) |
| 8922 | insn |= addis_0_2; |
| 8923 | else |
| 8924 | insn |= addis_0_13; |
| 8925 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8926 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 8927 | value = psymval->value(object, rela.get_r_addend()); |
| 8928 | } |
| 8929 | else |
| 8930 | { |
| 8931 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 8932 | Insn insn = nop; |
| 8933 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8934 | r_type = elfcpp::R_POWERPC_NONE; |
| 8935 | } |
| 8936 | } |
| 8937 | } |
| 8938 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 8939 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 8940 | { |
| 8941 | // Second instruction of a global dynamic sequence, |
| 8942 | // the __tls_get_addr call |
| 8943 | this->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset()); |
| 8944 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8945 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 8946 | if (tls_type != tls::TLSOPT_NONE) |
| 8947 | { |
| 8948 | if (tls_type == tls::TLSOPT_TO_IE) |
| 8949 | { |
| 8950 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 8951 | Insn insn = add_3_3_13; |
| 8952 | if (size == 32) |
| 8953 | insn = add_3_3_2; |
| 8954 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8955 | r_type = elfcpp::R_POWERPC_NONE; |
| 8956 | } |
| 8957 | else |
| 8958 | { |
| 8959 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 8960 | Insn insn = addi_3_3; |
| 8961 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8962 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 8963 | view += d_offset; |
| 8964 | value = psymval->value(object, rela.get_r_addend()); |
| 8965 | } |
| 8966 | this->skip_next_tls_get_addr_call(); |
| 8967 | } |
| 8968 | } |
| 8969 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 8970 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 8971 | { |
| 8972 | // Second instruction of a local dynamic sequence, |
| 8973 | // the __tls_get_addr call |
| 8974 | this->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset()); |
| 8975 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 8976 | if (tls_type == tls::TLSOPT_TO_LE) |
| 8977 | { |
| 8978 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 8979 | Insn insn = addi_3_3; |
| 8980 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 8981 | this->skip_next_tls_get_addr_call(); |
| 8982 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 8983 | view += d_offset; |
| 8984 | value = dtp_offset; |
| 8985 | } |
| 8986 | } |
| 8987 | else if (r_type == elfcpp::R_POWERPC_TLS) |
| 8988 | { |
| 8989 | // Second instruction of an initial exec sequence |
| 8990 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8991 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| 8992 | if (tls_type == tls::TLSOPT_TO_LE) |
| 8993 | { |
| 8994 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 8995 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 8996 | unsigned int reg = size == 32 ? 2 : 13; |
| 8997 | insn = at_tls_transform(insn, reg); |
| 8998 | gold_assert(insn != 0); |
| 8999 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 9000 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 9001 | view += d_offset; |
| 9002 | value = psymval->value(object, rela.get_r_addend()); |
| 9003 | } |
| 9004 | } |
| 9005 | else if (!has_stub_value) |
| 9006 | { |
| 9007 | if (!has_plt_offset && r_type == elfcpp::R_POWERPC_PLTCALL) |
| 9008 | { |
| 9009 | // PLTCALL without plt entry => convert to direct call |
| 9010 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 9011 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9012 | insn = (insn & 1) | b; |
| 9013 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 9014 | if (size == 32) |
| 9015 | r_type = elfcpp::R_PPC_PLTREL24; |
| 9016 | else |
| 9017 | r_type = elfcpp::R_POWERPC_REL24; |
| 9018 | } |
| 9019 | Address addend = 0; |
| 9020 | if (!(size == 32 |
| 9021 | && (r_type == elfcpp::R_PPC_PLTREL24 |
| 9022 | || r_type == elfcpp::R_POWERPC_PLT16_LO |
| 9023 | || r_type == elfcpp::R_POWERPC_PLT16_HI |
| 9024 | || r_type == elfcpp::R_POWERPC_PLT16_HA))) |
| 9025 | addend = rela.get_r_addend(); |
| 9026 | value = psymval->value(object, addend); |
| 9027 | if (size == 64 && is_branch_reloc(r_type)) |
| 9028 | { |
| 9029 | if (target->abiversion() >= 2) |
| 9030 | { |
| 9031 | if (gsym != NULL) |
| 9032 | value += object->ppc64_local_entry_offset(gsym); |
| 9033 | else |
| 9034 | value += object->ppc64_local_entry_offset(r_sym); |
| 9035 | } |
| 9036 | else |
| 9037 | { |
| 9038 | unsigned int dest_shndx; |
| 9039 | target->symval_for_branch(relinfo->symtab, gsym, object, |
| 9040 | &value, &dest_shndx); |
| 9041 | } |
| 9042 | } |
| 9043 | Address max_branch_offset = max_branch_delta(r_type); |
| 9044 | if (max_branch_offset != 0 |
| 9045 | && value - address + max_branch_offset >= 2 * max_branch_offset) |
| 9046 | { |
| 9047 | Stub_table<size, big_endian>* stub_table |
| 9048 | = object->stub_table(relinfo->data_shndx); |
| 9049 | if (stub_table != NULL) |
| 9050 | { |
| 9051 | Address off = stub_table->find_long_branch_entry(object, value); |
| 9052 | if (off != invalid_address) |
| 9053 | { |
| 9054 | value = (stub_table->stub_address() + stub_table->plt_size() |
| 9055 | + off); |
| 9056 | has_stub_value = true; |
| 9057 | } |
| 9058 | } |
| 9059 | } |
| 9060 | } |
| 9061 | |
| 9062 | switch (r_type) |
| 9063 | { |
| 9064 | case elfcpp::R_PPC64_REL64: |
| 9065 | case elfcpp::R_POWERPC_REL32: |
| 9066 | case elfcpp::R_POWERPC_REL24: |
| 9067 | case elfcpp::R_PPC_PLTREL24: |
| 9068 | case elfcpp::R_PPC_LOCAL24PC: |
| 9069 | case elfcpp::R_POWERPC_REL16: |
| 9070 | case elfcpp::R_POWERPC_REL16_LO: |
| 9071 | case elfcpp::R_POWERPC_REL16_HI: |
| 9072 | case elfcpp::R_POWERPC_REL16_HA: |
| 9073 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 9074 | case elfcpp::R_POWERPC_REL14: |
| 9075 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 9076 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 9077 | value -= address; |
| 9078 | break; |
| 9079 | |
| 9080 | case elfcpp::R_PPC64_TOC16: |
| 9081 | case elfcpp::R_PPC64_TOC16_LO: |
| 9082 | case elfcpp::R_PPC64_TOC16_HI: |
| 9083 | case elfcpp::R_PPC64_TOC16_HA: |
| 9084 | case elfcpp::R_PPC64_TOC16_DS: |
| 9085 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 9086 | // Subtract the TOC base address. |
| 9087 | value -= (target->got_section()->output_section()->address() |
| 9088 | + object->toc_base_offset()); |
| 9089 | break; |
| 9090 | |
| 9091 | case elfcpp::R_POWERPC_SECTOFF: |
| 9092 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 9093 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 9094 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 9095 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 9096 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 9097 | if (os != NULL) |
| 9098 | value -= os->address(); |
| 9099 | break; |
| 9100 | |
| 9101 | case elfcpp::R_PPC64_TPREL16_DS: |
| 9102 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 9103 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 9104 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 9105 | if (size != 64) |
| 9106 | // R_PPC_TLSGD, R_PPC_TLSLD, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HI |
| 9107 | break; |
| 9108 | // Fall through. |
| 9109 | case elfcpp::R_POWERPC_TPREL16: |
| 9110 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 9111 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 9112 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 9113 | case elfcpp::R_POWERPC_TPREL: |
| 9114 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 9115 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 9116 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 9117 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 9118 | // tls symbol values are relative to tls_segment()->vaddr() |
| 9119 | value -= tp_offset; |
| 9120 | break; |
| 9121 | |
| 9122 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 9123 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 9124 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 9125 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 9126 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 9127 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 9128 | if (size != 64) |
| 9129 | // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16, R_PPC_EMB_NADDR16_LO |
| 9130 | // R_PPC_EMB_NADDR16_HI, R_PPC_EMB_NADDR16_HA, R_PPC_EMB_SDAI16 |
| 9131 | break; |
| 9132 | // Fall through. |
| 9133 | case elfcpp::R_POWERPC_DTPREL16: |
| 9134 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 9135 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 9136 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 9137 | case elfcpp::R_POWERPC_DTPREL: |
| 9138 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 9139 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 9140 | // tls symbol values are relative to tls_segment()->vaddr() |
| 9141 | value -= dtp_offset; |
| 9142 | break; |
| 9143 | |
| 9144 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 9145 | if (gsym != NULL) |
| 9146 | value += object->ppc64_local_entry_offset(gsym); |
| 9147 | else |
| 9148 | value += object->ppc64_local_entry_offset(r_sym); |
| 9149 | break; |
| 9150 | |
| 9151 | default: |
| 9152 | break; |
| 9153 | } |
| 9154 | |
| 9155 | Insn branch_bit = 0; |
| 9156 | switch (r_type) |
| 9157 | { |
| 9158 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 9159 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 9160 | branch_bit = 1 << 21; |
| 9161 | // Fall through. |
| 9162 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 9163 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 9164 | { |
| 9165 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 9166 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9167 | insn &= ~(1 << 21); |
| 9168 | insn |= branch_bit; |
| 9169 | if (this->is_isa_v2) |
| 9170 | { |
| 9171 | // Set 'a' bit. This is 0b00010 in BO field for branch |
| 9172 | // on CR(BI) insns (BO == 001at or 011at), and 0b01000 |
| 9173 | // for branch on CTR insns (BO == 1a00t or 1a01t). |
| 9174 | if ((insn & (0x14 << 21)) == (0x04 << 21)) |
| 9175 | insn |= 0x02 << 21; |
| 9176 | else if ((insn & (0x14 << 21)) == (0x10 << 21)) |
| 9177 | insn |= 0x08 << 21; |
| 9178 | else |
| 9179 | break; |
| 9180 | } |
| 9181 | else |
| 9182 | { |
| 9183 | // Invert 'y' bit if not the default. |
| 9184 | if (static_cast<Signed_address>(value) < 0) |
| 9185 | insn ^= 1 << 21; |
| 9186 | } |
| 9187 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 9188 | } |
| 9189 | break; |
| 9190 | |
| 9191 | case elfcpp::R_POWERPC_PLT16_HA: |
| 9192 | if (size == 32 |
| 9193 | && !parameters->options().output_is_position_independent()) |
| 9194 | { |
| 9195 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 9196 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9197 | |
| 9198 | // Convert addis to lis. |
| 9199 | if ((insn & (0x3f << 26)) == 15u << 26 |
| 9200 | && (insn & (0x1f << 16)) != 0) |
| 9201 | { |
| 9202 | insn &= ~(0x1f << 16); |
| 9203 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 9204 | } |
| 9205 | } |
| 9206 | break; |
| 9207 | |
| 9208 | default: |
| 9209 | break; |
| 9210 | } |
| 9211 | |
| 9212 | if (size == 64) |
| 9213 | { |
| 9214 | switch (r_type) |
| 9215 | { |
| 9216 | default: |
| 9217 | break; |
| 9218 | |
| 9219 | // Multi-instruction sequences that access the GOT/TOC can |
| 9220 | // be optimized, eg. |
| 9221 | // addis ra,r2,x@got@ha; ld rb,x@got@l(ra); |
| 9222 | // to addis ra,r2,x@toc@ha; addi rb,ra,x@toc@l; |
| 9223 | // and |
| 9224 | // addis ra,r2,0; addi rb,ra,x@toc@l; |
| 9225 | // to nop; addi rb,r2,x@toc; |
| 9226 | // FIXME: the @got sequence shown above is not yet |
| 9227 | // optimized. Note that gcc as of 2017-01-07 doesn't use |
| 9228 | // the ELF @got relocs except for TLS, instead using the |
| 9229 | // PowerOpen variant of a compiler managed GOT (called TOC). |
| 9230 | // The PowerOpen TOC sequence equivalent to the first |
| 9231 | // example is optimized. |
| 9232 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 9233 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 9234 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 9235 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 9236 | case elfcpp::R_POWERPC_GOT16_HA: |
| 9237 | case elfcpp::R_PPC64_TOC16_HA: |
| 9238 | if (parameters->options().toc_optimize()) |
| 9239 | { |
| 9240 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 9241 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9242 | if (r_type == elfcpp::R_PPC64_TOC16_HA |
| 9243 | && object->make_toc_relative(target, &value)) |
| 9244 | { |
| 9245 | gold_assert((insn & ((0x3f << 26) | 0x1f << 16)) |
| 9246 | == ((15u << 26) | (2 << 16))); |
| 9247 | } |
| 9248 | if (((insn & ((0x3f << 26) | 0x1f << 16)) |
| 9249 | == ((15u << 26) | (2 << 16)) /* addis rt,2,imm */) |
| 9250 | && value + 0x8000 < 0x10000) |
| 9251 | { |
| 9252 | elfcpp::Swap<32, big_endian>::writeval(iview, nop); |
| 9253 | return true; |
| 9254 | } |
| 9255 | } |
| 9256 | break; |
| 9257 | |
| 9258 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 9259 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 9260 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 9261 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 9262 | case elfcpp::R_POWERPC_GOT16_LO: |
| 9263 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 9264 | case elfcpp::R_PPC64_TOC16_LO: |
| 9265 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 9266 | if (parameters->options().toc_optimize()) |
| 9267 | { |
| 9268 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 9269 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9270 | bool changed = false; |
| 9271 | if (r_type == elfcpp::R_PPC64_TOC16_LO_DS |
| 9272 | && object->make_toc_relative(target, &value)) |
| 9273 | { |
| 9274 | gold_assert ((insn & (0x3f << 26)) == 58u << 26 /* ld */); |
| 9275 | insn ^= (14u << 26) ^ (58u << 26); |
| 9276 | r_type = elfcpp::R_PPC64_TOC16_LO; |
| 9277 | changed = true; |
| 9278 | } |
| 9279 | if (ok_lo_toc_insn(insn, r_type) |
| 9280 | && value + 0x8000 < 0x10000) |
| 9281 | { |
| 9282 | if ((insn & (0x3f << 26)) == 12u << 26 /* addic */) |
| 9283 | { |
| 9284 | // Transform addic to addi when we change reg. |
| 9285 | insn &= ~((0x3f << 26) | (0x1f << 16)); |
| 9286 | insn |= (14u << 26) | (2 << 16); |
| 9287 | } |
| 9288 | else |
| 9289 | { |
| 9290 | insn &= ~(0x1f << 16); |
| 9291 | insn |= 2 << 16; |
| 9292 | } |
| 9293 | changed = true; |
| 9294 | } |
| 9295 | if (changed) |
| 9296 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 9297 | } |
| 9298 | break; |
| 9299 | |
| 9300 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 9301 | if (parameters->options().tls_optimize() && value + 0x8000 < 0x10000) |
| 9302 | { |
| 9303 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 9304 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9305 | if ((insn & ((0x3f << 26) | 0x1f << 16)) |
| 9306 | != ((15u << 26) | ((size == 32 ? 2 : 13) << 16))) |
| 9307 | ; |
| 9308 | else |
| 9309 | { |
| 9310 | elfcpp::Swap<32, big_endian>::writeval(iview, nop); |
| 9311 | return true; |
| 9312 | } |
| 9313 | } |
| 9314 | break; |
| 9315 | |
| 9316 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 9317 | if (size == 32) |
| 9318 | // R_PPC_TLSGD, R_PPC_TLSLD |
| 9319 | break; |
| 9320 | // Fall through. |
| 9321 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 9322 | if (parameters->options().tls_optimize() && value + 0x8000 < 0x10000) |
| 9323 | { |
| 9324 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 9325 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9326 | insn &= ~(0x1f << 16); |
| 9327 | insn |= (size == 32 ? 2 : 13) << 16; |
| 9328 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 9329 | } |
| 9330 | break; |
| 9331 | |
| 9332 | case elfcpp::R_PPC64_ENTRY: |
| 9333 | value = (target->got_section()->output_section()->address() |
| 9334 | + object->toc_base_offset()); |
| 9335 | if (value + 0x80008000 <= 0xffffffff |
| 9336 | && !parameters->options().output_is_position_independent()) |
| 9337 | { |
| 9338 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 9339 | Insn insn1 = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9340 | Insn insn2 = elfcpp::Swap<32, big_endian>::readval(iview + 1); |
| 9341 | |
| 9342 | if ((insn1 & ~0xfffc) == ld_2_12 |
| 9343 | && insn2 == add_2_2_12) |
| 9344 | { |
| 9345 | insn1 = lis_2 + ha(value); |
| 9346 | elfcpp::Swap<32, big_endian>::writeval(iview, insn1); |
| 9347 | insn2 = addi_2_2 + l(value); |
| 9348 | elfcpp::Swap<32, big_endian>::writeval(iview + 1, insn2); |
| 9349 | return true; |
| 9350 | } |
| 9351 | } |
| 9352 | else |
| 9353 | { |
| 9354 | value -= address; |
| 9355 | if (value + 0x80008000 <= 0xffffffff) |
| 9356 | { |
| 9357 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 9358 | Insn insn1 = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9359 | Insn insn2 = elfcpp::Swap<32, big_endian>::readval(iview + 1); |
| 9360 | |
| 9361 | if ((insn1 & ~0xfffc) == ld_2_12 |
| 9362 | && insn2 == add_2_2_12) |
| 9363 | { |
| 9364 | insn1 = addis_2_12 + ha(value); |
| 9365 | elfcpp::Swap<32, big_endian>::writeval(iview, insn1); |
| 9366 | insn2 = addi_2_2 + l(value); |
| 9367 | elfcpp::Swap<32, big_endian>::writeval(iview + 1, insn2); |
| 9368 | return true; |
| 9369 | } |
| 9370 | } |
| 9371 | } |
| 9372 | break; |
| 9373 | |
| 9374 | case elfcpp::R_POWERPC_REL16_LO: |
| 9375 | // If we are generating a non-PIC executable, edit |
| 9376 | // 0: addis 2,12,.TOC.-0b@ha |
| 9377 | // addi 2,2,.TOC.-0b@l |
| 9378 | // used by ELFv2 global entry points to set up r2, to |
| 9379 | // lis 2,.TOC.@ha |
| 9380 | // addi 2,2,.TOC.@l |
| 9381 | // if .TOC. is in range. */ |
| 9382 | if (value + address - 4 + 0x80008000 <= 0xffffffff |
| 9383 | && relnum != 0 |
| 9384 | && preloc != NULL |
| 9385 | && target->abiversion() >= 2 |
| 9386 | && !parameters->options().output_is_position_independent() |
| 9387 | && rela.get_r_addend() == d_offset + 4 |
| 9388 | && gsym != NULL |
| 9389 | && strcmp(gsym->name(), ".TOC.") == 0) |
| 9390 | { |
| 9391 | const int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 9392 | Reltype prev_rela(preloc - reloc_size); |
| 9393 | if ((prev_rela.get_r_info() |
| 9394 | == elfcpp::elf_r_info<size>(r_sym, |
| 9395 | elfcpp::R_POWERPC_REL16_HA)) |
| 9396 | && prev_rela.get_r_offset() + 4 == rela.get_r_offset() |
| 9397 | && prev_rela.get_r_addend() + 4 == rela.get_r_addend()) |
| 9398 | { |
| 9399 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 9400 | Insn insn1 = elfcpp::Swap<32, big_endian>::readval(iview - 1); |
| 9401 | Insn insn2 = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9402 | |
| 9403 | if ((insn1 & 0xffff0000) == addis_2_12 |
| 9404 | && (insn2 & 0xffff0000) == addi_2_2) |
| 9405 | { |
| 9406 | insn1 = lis_2 + ha(value + address - 4); |
| 9407 | elfcpp::Swap<32, big_endian>::writeval(iview - 1, insn1); |
| 9408 | insn2 = addi_2_2 + l(value + address - 4); |
| 9409 | elfcpp::Swap<32, big_endian>::writeval(iview, insn2); |
| 9410 | if (relinfo->rr) |
| 9411 | { |
| 9412 | relinfo->rr->set_strategy(relnum - 1, |
| 9413 | Relocatable_relocs::RELOC_SPECIAL); |
| 9414 | relinfo->rr->set_strategy(relnum, |
| 9415 | Relocatable_relocs::RELOC_SPECIAL); |
| 9416 | } |
| 9417 | return true; |
| 9418 | } |
| 9419 | } |
| 9420 | } |
| 9421 | break; |
| 9422 | } |
| 9423 | } |
| 9424 | |
| 9425 | typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE; |
| 9426 | elfcpp::Shdr<size, big_endian> shdr(relinfo->data_shdr); |
| 9427 | switch (r_type) |
| 9428 | { |
| 9429 | case elfcpp::R_POWERPC_ADDR32: |
| 9430 | case elfcpp::R_POWERPC_UADDR32: |
| 9431 | if (size == 64) |
| 9432 | overflow = Reloc::CHECK_BITFIELD; |
| 9433 | break; |
| 9434 | |
| 9435 | case elfcpp::R_POWERPC_REL32: |
| 9436 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 9437 | if (size == 64) |
| 9438 | overflow = Reloc::CHECK_SIGNED; |
| 9439 | break; |
| 9440 | |
| 9441 | case elfcpp::R_POWERPC_UADDR16: |
| 9442 | overflow = Reloc::CHECK_BITFIELD; |
| 9443 | break; |
| 9444 | |
| 9445 | case elfcpp::R_POWERPC_ADDR16: |
| 9446 | // We really should have three separate relocations, |
| 9447 | // one for 16-bit data, one for insns with 16-bit signed fields, |
| 9448 | // and one for insns with 16-bit unsigned fields. |
| 9449 | overflow = Reloc::CHECK_BITFIELD; |
| 9450 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) |
| 9451 | overflow = Reloc::CHECK_LOW_INSN; |
| 9452 | break; |
| 9453 | |
| 9454 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 9455 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 9456 | case elfcpp::R_POWERPC_GOT16_HI: |
| 9457 | case elfcpp::R_POWERPC_GOT16_HA: |
| 9458 | case elfcpp::R_POWERPC_PLT16_HI: |
| 9459 | case elfcpp::R_POWERPC_PLT16_HA: |
| 9460 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 9461 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 9462 | case elfcpp::R_PPC64_TOC16_HI: |
| 9463 | case elfcpp::R_PPC64_TOC16_HA: |
| 9464 | case elfcpp::R_PPC64_PLTGOT16_HI: |
| 9465 | case elfcpp::R_PPC64_PLTGOT16_HA: |
| 9466 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 9467 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 9468 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 9469 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 9470 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 9471 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 9472 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 9473 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 9474 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 9475 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 9476 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 9477 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 9478 | case elfcpp::R_POWERPC_REL16_HI: |
| 9479 | case elfcpp::R_POWERPC_REL16_HA: |
| 9480 | if (size != 32) |
| 9481 | overflow = Reloc::CHECK_HIGH_INSN; |
| 9482 | break; |
| 9483 | |
| 9484 | case elfcpp::R_POWERPC_REL16: |
| 9485 | case elfcpp::R_PPC64_TOC16: |
| 9486 | case elfcpp::R_POWERPC_GOT16: |
| 9487 | case elfcpp::R_POWERPC_SECTOFF: |
| 9488 | case elfcpp::R_POWERPC_TPREL16: |
| 9489 | case elfcpp::R_POWERPC_DTPREL16: |
| 9490 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 9491 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 9492 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 9493 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 9494 | overflow = Reloc::CHECK_LOW_INSN; |
| 9495 | break; |
| 9496 | |
| 9497 | case elfcpp::R_POWERPC_ADDR24: |
| 9498 | case elfcpp::R_POWERPC_ADDR14: |
| 9499 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 9500 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 9501 | case elfcpp::R_PPC64_ADDR16_DS: |
| 9502 | case elfcpp::R_POWERPC_REL24: |
| 9503 | case elfcpp::R_PPC_PLTREL24: |
| 9504 | case elfcpp::R_PPC_LOCAL24PC: |
| 9505 | case elfcpp::R_PPC64_TPREL16_DS: |
| 9506 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 9507 | case elfcpp::R_PPC64_TOC16_DS: |
| 9508 | case elfcpp::R_PPC64_GOT16_DS: |
| 9509 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 9510 | case elfcpp::R_POWERPC_REL14: |
| 9511 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 9512 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 9513 | overflow = Reloc::CHECK_SIGNED; |
| 9514 | break; |
| 9515 | } |
| 9516 | |
| 9517 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 9518 | Insn insn = 0; |
| 9519 | |
| 9520 | if (overflow == Reloc::CHECK_LOW_INSN |
| 9521 | || overflow == Reloc::CHECK_HIGH_INSN) |
| 9522 | { |
| 9523 | insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9524 | |
| 9525 | if ((insn & (0x3f << 26)) == 10u << 26 /* cmpli */) |
| 9526 | overflow = Reloc::CHECK_BITFIELD; |
| 9527 | else if (overflow == Reloc::CHECK_LOW_INSN |
| 9528 | ? ((insn & (0x3f << 26)) == 28u << 26 /* andi */ |
| 9529 | || (insn & (0x3f << 26)) == 24u << 26 /* ori */ |
| 9530 | || (insn & (0x3f << 26)) == 26u << 26 /* xori */) |
| 9531 | : ((insn & (0x3f << 26)) == 29u << 26 /* andis */ |
| 9532 | || (insn & (0x3f << 26)) == 25u << 26 /* oris */ |
| 9533 | || (insn & (0x3f << 26)) == 27u << 26 /* xoris */)) |
| 9534 | overflow = Reloc::CHECK_UNSIGNED; |
| 9535 | else |
| 9536 | overflow = Reloc::CHECK_SIGNED; |
| 9537 | } |
| 9538 | |
| 9539 | bool maybe_dq_reloc = false; |
| 9540 | typename Powerpc_relocate_functions<size, big_endian>::Status status |
| 9541 | = Powerpc_relocate_functions<size, big_endian>::STATUS_OK; |
| 9542 | switch (r_type) |
| 9543 | { |
| 9544 | case elfcpp::R_POWERPC_NONE: |
| 9545 | case elfcpp::R_POWERPC_TLS: |
| 9546 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 9547 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 9548 | case elfcpp::R_POWERPC_PLTSEQ: |
| 9549 | case elfcpp::R_POWERPC_PLTCALL: |
| 9550 | break; |
| 9551 | |
| 9552 | case elfcpp::R_PPC64_ADDR64: |
| 9553 | case elfcpp::R_PPC64_REL64: |
| 9554 | case elfcpp::R_PPC64_TOC: |
| 9555 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 9556 | Reloc::addr64(view, value); |
| 9557 | break; |
| 9558 | |
| 9559 | case elfcpp::R_POWERPC_TPREL: |
| 9560 | case elfcpp::R_POWERPC_DTPREL: |
| 9561 | if (size == 64) |
| 9562 | Reloc::addr64(view, value); |
| 9563 | else |
| 9564 | status = Reloc::addr32(view, value, overflow); |
| 9565 | break; |
| 9566 | |
| 9567 | case elfcpp::R_PPC64_UADDR64: |
| 9568 | Reloc::addr64_u(view, value); |
| 9569 | break; |
| 9570 | |
| 9571 | case elfcpp::R_POWERPC_ADDR32: |
| 9572 | status = Reloc::addr32(view, value, overflow); |
| 9573 | break; |
| 9574 | |
| 9575 | case elfcpp::R_POWERPC_REL32: |
| 9576 | case elfcpp::R_POWERPC_UADDR32: |
| 9577 | status = Reloc::addr32_u(view, value, overflow); |
| 9578 | break; |
| 9579 | |
| 9580 | case elfcpp::R_POWERPC_ADDR24: |
| 9581 | case elfcpp::R_POWERPC_REL24: |
| 9582 | case elfcpp::R_PPC_PLTREL24: |
| 9583 | case elfcpp::R_PPC_LOCAL24PC: |
| 9584 | status = Reloc::addr24(view, value, overflow); |
| 9585 | break; |
| 9586 | |
| 9587 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 9588 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 9589 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 9590 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 9591 | if (size == 64) |
| 9592 | { |
| 9593 | // On ppc64 these are all ds form |
| 9594 | maybe_dq_reloc = true; |
| 9595 | break; |
| 9596 | } |
| 9597 | // Fall through. |
| 9598 | case elfcpp::R_POWERPC_ADDR16: |
| 9599 | case elfcpp::R_POWERPC_REL16: |
| 9600 | case elfcpp::R_PPC64_TOC16: |
| 9601 | case elfcpp::R_POWERPC_GOT16: |
| 9602 | case elfcpp::R_POWERPC_SECTOFF: |
| 9603 | case elfcpp::R_POWERPC_TPREL16: |
| 9604 | case elfcpp::R_POWERPC_DTPREL16: |
| 9605 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 9606 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 9607 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 9608 | case elfcpp::R_POWERPC_REL16_LO: |
| 9609 | case elfcpp::R_PPC64_TOC16_LO: |
| 9610 | case elfcpp::R_POWERPC_GOT16_LO: |
| 9611 | case elfcpp::R_POWERPC_PLT16_LO: |
| 9612 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 9613 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 9614 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 9615 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 9616 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 9617 | if (size == 64) |
| 9618 | status = Reloc::addr16(view, value, overflow); |
| 9619 | else |
| 9620 | maybe_dq_reloc = true; |
| 9621 | break; |
| 9622 | |
| 9623 | case elfcpp::R_POWERPC_UADDR16: |
| 9624 | status = Reloc::addr16_u(view, value, overflow); |
| 9625 | break; |
| 9626 | |
| 9627 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 9628 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 9629 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 9630 | if (size == 32) |
| 9631 | // R_PPC_EMB_MRKREF, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HA |
| 9632 | goto unsupp; |
| 9633 | // Fall through. |
| 9634 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 9635 | case elfcpp::R_POWERPC_REL16_HI: |
| 9636 | case elfcpp::R_PPC64_TOC16_HI: |
| 9637 | case elfcpp::R_POWERPC_GOT16_HI: |
| 9638 | case elfcpp::R_POWERPC_PLT16_HI: |
| 9639 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 9640 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 9641 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 9642 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 9643 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 9644 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 9645 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 9646 | Reloc::addr16_hi(view, value); |
| 9647 | break; |
| 9648 | |
| 9649 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 9650 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 9651 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 9652 | if (size == 32) |
| 9653 | // R_PPC_EMB_RELSEC16, R_PPC_EMB_RELST_HI, R_PPC_EMB_BIT_FLD |
| 9654 | goto unsupp; |
| 9655 | // Fall through. |
| 9656 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 9657 | case elfcpp::R_POWERPC_REL16_HA: |
| 9658 | case elfcpp::R_PPC64_TOC16_HA: |
| 9659 | case elfcpp::R_POWERPC_GOT16_HA: |
| 9660 | case elfcpp::R_POWERPC_PLT16_HA: |
| 9661 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 9662 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 9663 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 9664 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 9665 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 9666 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 9667 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 9668 | Reloc::addr16_ha(view, value); |
| 9669 | break; |
| 9670 | |
| 9671 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 9672 | status = Reloc::addr16dx_ha(view, value, overflow); |
| 9673 | break; |
| 9674 | |
| 9675 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 9676 | if (size == 32) |
| 9677 | // R_PPC_EMB_NADDR16_LO |
| 9678 | goto unsupp; |
| 9679 | // Fall through. |
| 9680 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 9681 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 9682 | Reloc::addr16_hi2(view, value); |
| 9683 | break; |
| 9684 | |
| 9685 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 9686 | if (size == 32) |
| 9687 | // R_PPC_EMB_NADDR16_HI |
| 9688 | goto unsupp; |
| 9689 | // Fall through. |
| 9690 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 9691 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 9692 | Reloc::addr16_ha2(view, value); |
| 9693 | break; |
| 9694 | |
| 9695 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 9696 | if (size == 32) |
| 9697 | // R_PPC_EMB_NADDR16_HA |
| 9698 | goto unsupp; |
| 9699 | // Fall through. |
| 9700 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 9701 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 9702 | Reloc::addr16_hi3(view, value); |
| 9703 | break; |
| 9704 | |
| 9705 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 9706 | if (size == 32) |
| 9707 | // R_PPC_EMB_SDAI16 |
| 9708 | goto unsupp; |
| 9709 | // Fall through. |
| 9710 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 9711 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 9712 | Reloc::addr16_ha3(view, value); |
| 9713 | break; |
| 9714 | |
| 9715 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 9716 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 9717 | if (size == 32) |
| 9718 | // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16 |
| 9719 | goto unsupp; |
| 9720 | // Fall through. |
| 9721 | case elfcpp::R_PPC64_TPREL16_DS: |
| 9722 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 9723 | if (size == 32) |
| 9724 | // R_PPC_TLSGD, R_PPC_TLSLD |
| 9725 | break; |
| 9726 | // Fall through. |
| 9727 | case elfcpp::R_PPC64_ADDR16_DS: |
| 9728 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 9729 | case elfcpp::R_PPC64_TOC16_DS: |
| 9730 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 9731 | case elfcpp::R_PPC64_GOT16_DS: |
| 9732 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 9733 | case elfcpp::R_PPC64_PLT16_LO_DS: |
| 9734 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 9735 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 9736 | maybe_dq_reloc = true; |
| 9737 | break; |
| 9738 | |
| 9739 | case elfcpp::R_POWERPC_ADDR14: |
| 9740 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 9741 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 9742 | case elfcpp::R_POWERPC_REL14: |
| 9743 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 9744 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 9745 | status = Reloc::addr14(view, value, overflow); |
| 9746 | break; |
| 9747 | |
| 9748 | case elfcpp::R_POWERPC_COPY: |
| 9749 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 9750 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 9751 | case elfcpp::R_POWERPC_RELATIVE: |
| 9752 | case elfcpp::R_POWERPC_DTPMOD: |
| 9753 | case elfcpp::R_PPC64_JMP_IREL: |
| 9754 | case elfcpp::R_POWERPC_IRELATIVE: |
| 9755 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 9756 | _("unexpected reloc %u in object file"), |
| 9757 | r_type); |
| 9758 | break; |
| 9759 | |
| 9760 | case elfcpp::R_PPC64_TOCSAVE: |
| 9761 | if (size == 32) |
| 9762 | // R_PPC_EMB_SDA21 |
| 9763 | goto unsupp; |
| 9764 | else |
| 9765 | { |
| 9766 | Symbol_location loc; |
| 9767 | loc.object = relinfo->object; |
| 9768 | loc.shndx = relinfo->data_shndx; |
| 9769 | loc.offset = rela.get_r_offset(); |
| 9770 | Tocsave_loc::const_iterator p = target->tocsave_loc().find(loc); |
| 9771 | if (p != target->tocsave_loc().end()) |
| 9772 | { |
| 9773 | // If we've generated plt calls using this tocsave, then |
| 9774 | // the nop needs to be changed to save r2. |
| 9775 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 9776 | if (elfcpp::Swap<32, big_endian>::readval(iview) == nop) |
| 9777 | elfcpp::Swap<32, big_endian>:: |
| 9778 | writeval(iview, std_2_1 + target->stk_toc()); |
| 9779 | } |
| 9780 | } |
| 9781 | break; |
| 9782 | |
| 9783 | case elfcpp::R_PPC_EMB_SDA2I16: |
| 9784 | case elfcpp::R_PPC_EMB_SDA2REL: |
| 9785 | if (size == 32) |
| 9786 | goto unsupp; |
| 9787 | // R_PPC64_TLSGD, R_PPC64_TLSLD |
| 9788 | break; |
| 9789 | |
| 9790 | case elfcpp::R_POWERPC_PLT32: |
| 9791 | case elfcpp::R_POWERPC_PLTREL32: |
| 9792 | case elfcpp::R_PPC_SDAREL16: |
| 9793 | case elfcpp::R_POWERPC_ADDR30: |
| 9794 | case elfcpp::R_PPC64_PLT64: |
| 9795 | case elfcpp::R_PPC64_PLTREL64: |
| 9796 | case elfcpp::R_PPC64_PLTGOT16: |
| 9797 | case elfcpp::R_PPC64_PLTGOT16_LO: |
| 9798 | case elfcpp::R_PPC64_PLTGOT16_HI: |
| 9799 | case elfcpp::R_PPC64_PLTGOT16_HA: |
| 9800 | case elfcpp::R_PPC64_PLTGOT16_DS: |
| 9801 | case elfcpp::R_PPC64_PLTGOT16_LO_DS: |
| 9802 | case elfcpp::R_PPC_EMB_RELSDA: |
| 9803 | case elfcpp::R_PPC_TOC16: |
| 9804 | default: |
| 9805 | unsupp: |
| 9806 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 9807 | _("unsupported reloc %u"), |
| 9808 | r_type); |
| 9809 | break; |
| 9810 | } |
| 9811 | |
| 9812 | if (maybe_dq_reloc) |
| 9813 | { |
| 9814 | if (insn == 0) |
| 9815 | insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 9816 | |
| 9817 | if ((insn & (0x3f << 26)) == 56u << 26 /* lq */ |
| 9818 | || ((insn & (0x3f << 26)) == (61u << 26) /* lxv, stxv */ |
| 9819 | && (insn & 3) == 1)) |
| 9820 | status = Reloc::addr16_dq(view, value, overflow); |
| 9821 | else if (size == 64 |
| 9822 | || (insn & (0x3f << 26)) == 58u << 26 /* ld,ldu,lwa */ |
| 9823 | || (insn & (0x3f << 26)) == 62u << 26 /* std,stdu,stq */ |
| 9824 | || (insn & (0x3f << 26)) == 57u << 26 /* lfdp */ |
| 9825 | || (insn & (0x3f << 26)) == 61u << 26 /* stfdp */) |
| 9826 | status = Reloc::addr16_ds(view, value, overflow); |
| 9827 | else |
| 9828 | status = Reloc::addr16(view, value, overflow); |
| 9829 | } |
| 9830 | |
| 9831 | if (status != Powerpc_relocate_functions<size, big_endian>::STATUS_OK |
| 9832 | && (has_stub_value |
| 9833 | || !(gsym != NULL |
| 9834 | && gsym->is_undefined() |
| 9835 | && is_branch_reloc(r_type)))) |
| 9836 | { |
| 9837 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 9838 | _("relocation overflow")); |
| 9839 | if (has_stub_value) |
| 9840 | gold_info(_("try relinking with a smaller --stub-group-size")); |
| 9841 | } |
| 9842 | |
| 9843 | return true; |
| 9844 | } |
| 9845 | |
| 9846 | // Relocate section data. |
| 9847 | |
| 9848 | template<int size, bool big_endian> |
| 9849 | void |
| 9850 | Target_powerpc<size, big_endian>::relocate_section( |
| 9851 | const Relocate_info<size, big_endian>* relinfo, |
| 9852 | unsigned int sh_type, |
| 9853 | const unsigned char* prelocs, |
| 9854 | size_t reloc_count, |
| 9855 | Output_section* output_section, |
| 9856 | bool needs_special_offset_handling, |
| 9857 | unsigned char* view, |
| 9858 | Address address, |
| 9859 | section_size_type view_size, |
| 9860 | const Reloc_symbol_changes* reloc_symbol_changes) |
| 9861 | { |
| 9862 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 9863 | typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate; |
| 9864 | typedef typename Target_powerpc<size, big_endian>::Relocate_comdat_behavior |
| 9865 | Powerpc_comdat_behavior; |
| 9866 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 9867 | Classify_reloc; |
| 9868 | |
| 9869 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 9870 | |
| 9871 | gold::relocate_section<size, big_endian, Powerpc, Powerpc_relocate, |
| 9872 | Powerpc_comdat_behavior, Classify_reloc>( |
| 9873 | relinfo, |
| 9874 | this, |
| 9875 | prelocs, |
| 9876 | reloc_count, |
| 9877 | output_section, |
| 9878 | needs_special_offset_handling, |
| 9879 | view, |
| 9880 | address, |
| 9881 | view_size, |
| 9882 | reloc_symbol_changes); |
| 9883 | } |
| 9884 | |
| 9885 | template<int size, bool big_endian> |
| 9886 | class Powerpc_scan_relocatable_reloc |
| 9887 | { |
| 9888 | public: |
| 9889 | typedef typename elfcpp::Rela<size, big_endian> Reltype; |
| 9890 | static const int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 9891 | static const int sh_type = elfcpp::SHT_RELA; |
| 9892 | |
| 9893 | // Return the symbol referred to by the relocation. |
| 9894 | static inline unsigned int |
| 9895 | get_r_sym(const Reltype* reloc) |
| 9896 | { return elfcpp::elf_r_sym<size>(reloc->get_r_info()); } |
| 9897 | |
| 9898 | // Return the type of the relocation. |
| 9899 | static inline unsigned int |
| 9900 | get_r_type(const Reltype* reloc) |
| 9901 | { return elfcpp::elf_r_type<size>(reloc->get_r_info()); } |
| 9902 | |
| 9903 | // Return the strategy to use for a local symbol which is not a |
| 9904 | // section symbol, given the relocation type. |
| 9905 | inline Relocatable_relocs::Reloc_strategy |
| 9906 | local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym) |
| 9907 | { |
| 9908 | if (r_type == 0 && r_sym == 0) |
| 9909 | return Relocatable_relocs::RELOC_DISCARD; |
| 9910 | return Relocatable_relocs::RELOC_COPY; |
| 9911 | } |
| 9912 | |
| 9913 | // Return the strategy to use for a local symbol which is a section |
| 9914 | // symbol, given the relocation type. |
| 9915 | inline Relocatable_relocs::Reloc_strategy |
| 9916 | local_section_strategy(unsigned int, Relobj*) |
| 9917 | { |
| 9918 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; |
| 9919 | } |
| 9920 | |
| 9921 | // Return the strategy to use for a global symbol, given the |
| 9922 | // relocation type, the object, and the symbol index. |
| 9923 | inline Relocatable_relocs::Reloc_strategy |
| 9924 | global_strategy(unsigned int r_type, Relobj*, unsigned int) |
| 9925 | { |
| 9926 | if (size == 32 |
| 9927 | && (r_type == elfcpp::R_PPC_PLTREL24 |
| 9928 | || r_type == elfcpp::R_POWERPC_PLT16_LO |
| 9929 | || r_type == elfcpp::R_POWERPC_PLT16_HI |
| 9930 | || r_type == elfcpp::R_POWERPC_PLT16_HA)) |
| 9931 | return Relocatable_relocs::RELOC_SPECIAL; |
| 9932 | return Relocatable_relocs::RELOC_COPY; |
| 9933 | } |
| 9934 | }; |
| 9935 | |
| 9936 | // Scan the relocs during a relocatable link. |
| 9937 | |
| 9938 | template<int size, bool big_endian> |
| 9939 | void |
| 9940 | Target_powerpc<size, big_endian>::scan_relocatable_relocs( |
| 9941 | Symbol_table* symtab, |
| 9942 | Layout* layout, |
| 9943 | Sized_relobj_file<size, big_endian>* object, |
| 9944 | unsigned int data_shndx, |
| 9945 | unsigned int sh_type, |
| 9946 | const unsigned char* prelocs, |
| 9947 | size_t reloc_count, |
| 9948 | Output_section* output_section, |
| 9949 | bool needs_special_offset_handling, |
| 9950 | size_t local_symbol_count, |
| 9951 | const unsigned char* plocal_symbols, |
| 9952 | Relocatable_relocs* rr) |
| 9953 | { |
| 9954 | typedef Powerpc_scan_relocatable_reloc<size, big_endian> Scan_strategy; |
| 9955 | |
| 9956 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 9957 | |
| 9958 | gold::scan_relocatable_relocs<size, big_endian, Scan_strategy>( |
| 9959 | symtab, |
| 9960 | layout, |
| 9961 | object, |
| 9962 | data_shndx, |
| 9963 | prelocs, |
| 9964 | reloc_count, |
| 9965 | output_section, |
| 9966 | needs_special_offset_handling, |
| 9967 | local_symbol_count, |
| 9968 | plocal_symbols, |
| 9969 | rr); |
| 9970 | } |
| 9971 | |
| 9972 | // Scan the relocs for --emit-relocs. |
| 9973 | |
| 9974 | template<int size, bool big_endian> |
| 9975 | void |
| 9976 | Target_powerpc<size, big_endian>::emit_relocs_scan( |
| 9977 | Symbol_table* symtab, |
| 9978 | Layout* layout, |
| 9979 | Sized_relobj_file<size, big_endian>* object, |
| 9980 | unsigned int data_shndx, |
| 9981 | unsigned int sh_type, |
| 9982 | const unsigned char* prelocs, |
| 9983 | size_t reloc_count, |
| 9984 | Output_section* output_section, |
| 9985 | bool needs_special_offset_handling, |
| 9986 | size_t local_symbol_count, |
| 9987 | const unsigned char* plocal_syms, |
| 9988 | Relocatable_relocs* rr) |
| 9989 | { |
| 9990 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 9991 | Classify_reloc; |
| 9992 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> |
| 9993 | Emit_relocs_strategy; |
| 9994 | |
| 9995 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 9996 | |
| 9997 | gold::scan_relocatable_relocs<size, big_endian, Emit_relocs_strategy>( |
| 9998 | symtab, |
| 9999 | layout, |
| 10000 | object, |
| 10001 | data_shndx, |
| 10002 | prelocs, |
| 10003 | reloc_count, |
| 10004 | output_section, |
| 10005 | needs_special_offset_handling, |
| 10006 | local_symbol_count, |
| 10007 | plocal_syms, |
| 10008 | rr); |
| 10009 | } |
| 10010 | |
| 10011 | // Emit relocations for a section. |
| 10012 | // This is a modified version of the function by the same name in |
| 10013 | // target-reloc.h. Using relocate_special_relocatable for |
| 10014 | // R_PPC_PLTREL24 would require duplication of the entire body of the |
| 10015 | // loop, so we may as well duplicate the whole thing. |
| 10016 | |
| 10017 | template<int size, bool big_endian> |
| 10018 | void |
| 10019 | Target_powerpc<size, big_endian>::relocate_relocs( |
| 10020 | const Relocate_info<size, big_endian>* relinfo, |
| 10021 | unsigned int sh_type, |
| 10022 | const unsigned char* prelocs, |
| 10023 | size_t reloc_count, |
| 10024 | Output_section* output_section, |
| 10025 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 10026 | unsigned char*, |
| 10027 | Address view_address, |
| 10028 | section_size_type, |
| 10029 | unsigned char* reloc_view, |
| 10030 | section_size_type reloc_view_size) |
| 10031 | { |
| 10032 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 10033 | |
| 10034 | typedef typename elfcpp::Rela<size, big_endian> Reltype; |
| 10035 | typedef typename elfcpp::Rela_write<size, big_endian> Reltype_write; |
| 10036 | const int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 10037 | // Offset from start of insn to d-field reloc. |
| 10038 | const int d_offset = big_endian ? 2 : 0; |
| 10039 | |
| 10040 | Powerpc_relobj<size, big_endian>* const object |
| 10041 | = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); |
| 10042 | const unsigned int local_count = object->local_symbol_count(); |
| 10043 | unsigned int got2_shndx = object->got2_shndx(); |
| 10044 | Address got2_addend = 0; |
| 10045 | if (got2_shndx != 0) |
| 10046 | { |
| 10047 | got2_addend = object->get_output_section_offset(got2_shndx); |
| 10048 | gold_assert(got2_addend != invalid_address); |
| 10049 | } |
| 10050 | |
| 10051 | const bool relocatable = parameters->options().relocatable(); |
| 10052 | |
| 10053 | unsigned char* pwrite = reloc_view; |
| 10054 | bool zap_next = false; |
| 10055 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| 10056 | { |
| 10057 | Relocatable_relocs::Reloc_strategy strategy = relinfo->rr->strategy(i); |
| 10058 | if (strategy == Relocatable_relocs::RELOC_DISCARD) |
| 10059 | continue; |
| 10060 | |
| 10061 | Reltype reloc(prelocs); |
| 10062 | Reltype_write reloc_write(pwrite); |
| 10063 | |
| 10064 | Address offset = reloc.get_r_offset(); |
| 10065 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); |
| 10066 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 10067 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 10068 | const unsigned int orig_r_sym = r_sym; |
| 10069 | typename elfcpp::Elf_types<size>::Elf_Swxword addend |
| 10070 | = reloc.get_r_addend(); |
| 10071 | const Symbol* gsym = NULL; |
| 10072 | |
| 10073 | if (zap_next) |
| 10074 | { |
| 10075 | // We could arrange to discard these and other relocs for |
| 10076 | // tls optimised sequences in the strategy methods, but for |
| 10077 | // now do as BFD ld does. |
| 10078 | r_type = elfcpp::R_POWERPC_NONE; |
| 10079 | zap_next = false; |
| 10080 | } |
| 10081 | |
| 10082 | // Get the new symbol index. |
| 10083 | Output_section* os = NULL; |
| 10084 | if (r_sym < local_count) |
| 10085 | { |
| 10086 | switch (strategy) |
| 10087 | { |
| 10088 | case Relocatable_relocs::RELOC_COPY: |
| 10089 | case Relocatable_relocs::RELOC_SPECIAL: |
| 10090 | if (r_sym != 0) |
| 10091 | { |
| 10092 | r_sym = object->symtab_index(r_sym); |
| 10093 | gold_assert(r_sym != -1U); |
| 10094 | } |
| 10095 | break; |
| 10096 | |
| 10097 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA: |
| 10098 | { |
| 10099 | // We are adjusting a section symbol. We need to find |
| 10100 | // the symbol table index of the section symbol for |
| 10101 | // the output section corresponding to input section |
| 10102 | // in which this symbol is defined. |
| 10103 | gold_assert(r_sym < local_count); |
| 10104 | bool is_ordinary; |
| 10105 | unsigned int shndx = |
| 10106 | object->local_symbol_input_shndx(r_sym, &is_ordinary); |
| 10107 | gold_assert(is_ordinary); |
| 10108 | os = object->output_section(shndx); |
| 10109 | gold_assert(os != NULL); |
| 10110 | gold_assert(os->needs_symtab_index()); |
| 10111 | r_sym = os->symtab_index(); |
| 10112 | } |
| 10113 | break; |
| 10114 | |
| 10115 | default: |
| 10116 | gold_unreachable(); |
| 10117 | } |
| 10118 | } |
| 10119 | else |
| 10120 | { |
| 10121 | gsym = object->global_symbol(r_sym); |
| 10122 | gold_assert(gsym != NULL); |
| 10123 | if (gsym->is_forwarder()) |
| 10124 | gsym = relinfo->symtab->resolve_forwards(gsym); |
| 10125 | |
| 10126 | gold_assert(gsym->has_symtab_index()); |
| 10127 | r_sym = gsym->symtab_index(); |
| 10128 | } |
| 10129 | |
| 10130 | // Get the new offset--the location in the output section where |
| 10131 | // this relocation should be applied. |
| 10132 | if (static_cast<Address>(offset_in_output_section) != invalid_address) |
| 10133 | offset += offset_in_output_section; |
| 10134 | else |
| 10135 | { |
| 10136 | section_offset_type sot_offset = |
| 10137 | convert_types<section_offset_type, Address>(offset); |
| 10138 | section_offset_type new_sot_offset = |
| 10139 | output_section->output_offset(object, relinfo->data_shndx, |
| 10140 | sot_offset); |
| 10141 | gold_assert(new_sot_offset != -1); |
| 10142 | offset = new_sot_offset; |
| 10143 | } |
| 10144 | |
| 10145 | // In an object file, r_offset is an offset within the section. |
| 10146 | // In an executable or dynamic object, generated by |
| 10147 | // --emit-relocs, r_offset is an absolute address. |
| 10148 | if (!relocatable) |
| 10149 | { |
| 10150 | offset += view_address; |
| 10151 | if (static_cast<Address>(offset_in_output_section) != invalid_address) |
| 10152 | offset -= offset_in_output_section; |
| 10153 | } |
| 10154 | |
| 10155 | // Handle the reloc addend based on the strategy. |
| 10156 | if (strategy == Relocatable_relocs::RELOC_COPY) |
| 10157 | ; |
| 10158 | else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA) |
| 10159 | { |
| 10160 | const Symbol_value<size>* psymval = object->local_symbol(orig_r_sym); |
| 10161 | addend = psymval->value(object, addend); |
| 10162 | // In a relocatable link, the symbol value is relative to |
| 10163 | // the start of the output section. For a non-relocatable |
| 10164 | // link, we need to adjust the addend. |
| 10165 | if (!relocatable) |
| 10166 | { |
| 10167 | gold_assert(os != NULL); |
| 10168 | addend -= os->address(); |
| 10169 | } |
| 10170 | } |
| 10171 | else if (strategy == Relocatable_relocs::RELOC_SPECIAL) |
| 10172 | { |
| 10173 | if (size == 32) |
| 10174 | { |
| 10175 | if (addend >= 32768) |
| 10176 | addend += got2_addend; |
| 10177 | } |
| 10178 | else if (r_type == elfcpp::R_POWERPC_REL16_HA) |
| 10179 | { |
| 10180 | r_type = elfcpp::R_POWERPC_ADDR16_HA; |
| 10181 | addend -= d_offset; |
| 10182 | } |
| 10183 | else if (r_type == elfcpp::R_POWERPC_REL16_LO) |
| 10184 | { |
| 10185 | r_type = elfcpp::R_POWERPC_ADDR16_LO; |
| 10186 | addend -= d_offset + 4; |
| 10187 | } |
| 10188 | } |
| 10189 | else |
| 10190 | gold_unreachable(); |
| 10191 | |
| 10192 | if (!relocatable) |
| 10193 | { |
| 10194 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 10195 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO |
| 10196 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI |
| 10197 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) |
| 10198 | { |
| 10199 | // First instruction of a global dynamic sequence, |
| 10200 | // arg setup insn. |
| 10201 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 10202 | switch (this->optimize_tls_gd(final)) |
| 10203 | { |
| 10204 | case tls::TLSOPT_TO_IE: |
| 10205 | r_type += (elfcpp::R_POWERPC_GOT_TPREL16 |
| 10206 | - elfcpp::R_POWERPC_GOT_TLSGD16); |
| 10207 | break; |
| 10208 | case tls::TLSOPT_TO_LE: |
| 10209 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 10210 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| 10211 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 10212 | else |
| 10213 | { |
| 10214 | r_type = elfcpp::R_POWERPC_NONE; |
| 10215 | offset -= d_offset; |
| 10216 | } |
| 10217 | break; |
| 10218 | default: |
| 10219 | break; |
| 10220 | } |
| 10221 | } |
| 10222 | else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 10223 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO |
| 10224 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI |
| 10225 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) |
| 10226 | { |
| 10227 | // First instruction of a local dynamic sequence, |
| 10228 | // arg setup insn. |
| 10229 | if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) |
| 10230 | { |
| 10231 | if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 10232 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) |
| 10233 | { |
| 10234 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 10235 | const Output_section* os = relinfo->layout->tls_segment() |
| 10236 | ->first_section(); |
| 10237 | gold_assert(os != NULL); |
| 10238 | gold_assert(os->needs_symtab_index()); |
| 10239 | r_sym = os->symtab_index(); |
| 10240 | addend = dtp_offset; |
| 10241 | } |
| 10242 | else |
| 10243 | { |
| 10244 | r_type = elfcpp::R_POWERPC_NONE; |
| 10245 | offset -= d_offset; |
| 10246 | } |
| 10247 | } |
| 10248 | } |
| 10249 | else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 10250 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO |
| 10251 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI |
| 10252 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) |
| 10253 | { |
| 10254 | // First instruction of initial exec sequence. |
| 10255 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 10256 | if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) |
| 10257 | { |
| 10258 | if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 10259 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) |
| 10260 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 10261 | else |
| 10262 | { |
| 10263 | r_type = elfcpp::R_POWERPC_NONE; |
| 10264 | offset -= d_offset; |
| 10265 | } |
| 10266 | } |
| 10267 | } |
| 10268 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 10269 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 10270 | { |
| 10271 | // Second instruction of a global dynamic sequence, |
| 10272 | // the __tls_get_addr call |
| 10273 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 10274 | switch (this->optimize_tls_gd(final)) |
| 10275 | { |
| 10276 | case tls::TLSOPT_TO_IE: |
| 10277 | r_type = elfcpp::R_POWERPC_NONE; |
| 10278 | zap_next = true; |
| 10279 | break; |
| 10280 | case tls::TLSOPT_TO_LE: |
| 10281 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 10282 | offset += d_offset; |
| 10283 | zap_next = true; |
| 10284 | break; |
| 10285 | default: |
| 10286 | break; |
| 10287 | } |
| 10288 | } |
| 10289 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 10290 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 10291 | { |
| 10292 | // Second instruction of a local dynamic sequence, |
| 10293 | // the __tls_get_addr call |
| 10294 | if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) |
| 10295 | { |
| 10296 | const Output_section* os = relinfo->layout->tls_segment() |
| 10297 | ->first_section(); |
| 10298 | gold_assert(os != NULL); |
| 10299 | gold_assert(os->needs_symtab_index()); |
| 10300 | r_sym = os->symtab_index(); |
| 10301 | addend = dtp_offset; |
| 10302 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 10303 | offset += d_offset; |
| 10304 | zap_next = true; |
| 10305 | } |
| 10306 | } |
| 10307 | else if (r_type == elfcpp::R_POWERPC_TLS) |
| 10308 | { |
| 10309 | // Second instruction of an initial exec sequence |
| 10310 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 10311 | if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) |
| 10312 | { |
| 10313 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 10314 | offset += d_offset; |
| 10315 | } |
| 10316 | } |
| 10317 | } |
| 10318 | |
| 10319 | reloc_write.put_r_offset(offset); |
| 10320 | reloc_write.put_r_info(elfcpp::elf_r_info<size>(r_sym, r_type)); |
| 10321 | reloc_write.put_r_addend(addend); |
| 10322 | |
| 10323 | pwrite += reloc_size; |
| 10324 | } |
| 10325 | |
| 10326 | gold_assert(static_cast<section_size_type>(pwrite - reloc_view) |
| 10327 | == reloc_view_size); |
| 10328 | } |
| 10329 | |
| 10330 | // Return the value to use for a dynamic symbol which requires special |
| 10331 | // treatment. This is how we support equality comparisons of function |
| 10332 | // pointers across shared library boundaries, as described in the |
| 10333 | // processor specific ABI supplement. |
| 10334 | |
| 10335 | template<int size, bool big_endian> |
| 10336 | uint64_t |
| 10337 | Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
| 10338 | { |
| 10339 | if (size == 32) |
| 10340 | { |
| 10341 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| 10342 | for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); |
| 10343 | p != this->stub_tables_.end(); |
| 10344 | ++p) |
| 10345 | { |
| 10346 | const typename Stub_table<size, big_endian>::Plt_stub_ent* ent |
| 10347 | = (*p)->find_plt_call_entry(gsym); |
| 10348 | if (ent != NULL) |
| 10349 | return (*p)->stub_address() + ent->off_; |
| 10350 | } |
| 10351 | } |
| 10352 | else if (this->abiversion() >= 2) |
| 10353 | { |
| 10354 | Address off = this->glink_section()->find_global_entry(gsym); |
| 10355 | if (off != invalid_address) |
| 10356 | return this->glink_section()->global_entry_address() + off; |
| 10357 | } |
| 10358 | gold_unreachable(); |
| 10359 | } |
| 10360 | |
| 10361 | // Return the PLT address to use for a local symbol. |
| 10362 | template<int size, bool big_endian> |
| 10363 | uint64_t |
| 10364 | Target_powerpc<size, big_endian>::do_plt_address_for_local( |
| 10365 | const Relobj* object, |
| 10366 | unsigned int symndx) const |
| 10367 | { |
| 10368 | if (size == 32) |
| 10369 | { |
| 10370 | const Sized_relobj<size, big_endian>* relobj |
| 10371 | = static_cast<const Sized_relobj<size, big_endian>*>(object); |
| 10372 | for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); |
| 10373 | p != this->stub_tables_.end(); |
| 10374 | ++p) |
| 10375 | { |
| 10376 | const typename Stub_table<size, big_endian>::Plt_stub_ent* ent |
| 10377 | = (*p)->find_plt_call_entry(relobj->sized_relobj(), symndx); |
| 10378 | if (ent != NULL) |
| 10379 | return (*p)->stub_address() + ent->off_; |
| 10380 | } |
| 10381 | } |
| 10382 | gold_unreachable(); |
| 10383 | } |
| 10384 | |
| 10385 | // Return the PLT address to use for a global symbol. |
| 10386 | template<int size, bool big_endian> |
| 10387 | uint64_t |
| 10388 | Target_powerpc<size, big_endian>::do_plt_address_for_global( |
| 10389 | const Symbol* gsym) const |
| 10390 | { |
| 10391 | if (size == 32) |
| 10392 | { |
| 10393 | for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); |
| 10394 | p != this->stub_tables_.end(); |
| 10395 | ++p) |
| 10396 | { |
| 10397 | const typename Stub_table<size, big_endian>::Plt_stub_ent* ent |
| 10398 | = (*p)->find_plt_call_entry(gsym); |
| 10399 | if (ent != NULL) |
| 10400 | return (*p)->stub_address() + ent->off_; |
| 10401 | } |
| 10402 | } |
| 10403 | else if (this->abiversion() >= 2) |
| 10404 | { |
| 10405 | Address off = this->glink_section()->find_global_entry(gsym); |
| 10406 | if (off != invalid_address) |
| 10407 | return this->glink_section()->global_entry_address() + off; |
| 10408 | } |
| 10409 | gold_unreachable(); |
| 10410 | } |
| 10411 | |
| 10412 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 10413 | // for a local tls symbol specified by OBJECT, SYMNDX. |
| 10414 | template<int size, bool big_endian> |
| 10415 | int64_t |
| 10416 | Target_powerpc<size, big_endian>::do_tls_offset_for_local( |
| 10417 | const Relobj* object, |
| 10418 | unsigned int symndx, |
| 10419 | unsigned int got_indx) const |
| 10420 | { |
| 10421 | const Powerpc_relobj<size, big_endian>* ppc_object |
| 10422 | = static_cast<const Powerpc_relobj<size, big_endian>*>(object); |
| 10423 | if (ppc_object->local_symbol(symndx)->is_tls_symbol()) |
| 10424 | { |
| 10425 | for (Got_type got_type = GOT_TYPE_TLSGD; |
| 10426 | got_type <= GOT_TYPE_TPREL; |
| 10427 | got_type = Got_type(got_type + 1)) |
| 10428 | if (ppc_object->local_has_got_offset(symndx, got_type)) |
| 10429 | { |
| 10430 | unsigned int off = ppc_object->local_got_offset(symndx, got_type); |
| 10431 | if (got_type == GOT_TYPE_TLSGD) |
| 10432 | off += size / 8; |
| 10433 | if (off == got_indx * (size / 8)) |
| 10434 | { |
| 10435 | if (got_type == GOT_TYPE_TPREL) |
| 10436 | return -tp_offset; |
| 10437 | else |
| 10438 | return -dtp_offset; |
| 10439 | } |
| 10440 | } |
| 10441 | } |
| 10442 | gold_unreachable(); |
| 10443 | } |
| 10444 | |
| 10445 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 10446 | // for global tls symbol GSYM. |
| 10447 | template<int size, bool big_endian> |
| 10448 | int64_t |
| 10449 | Target_powerpc<size, big_endian>::do_tls_offset_for_global( |
| 10450 | Symbol* gsym, |
| 10451 | unsigned int got_indx) const |
| 10452 | { |
| 10453 | if (gsym->type() == elfcpp::STT_TLS) |
| 10454 | { |
| 10455 | for (Got_type got_type = GOT_TYPE_TLSGD; |
| 10456 | got_type <= GOT_TYPE_TPREL; |
| 10457 | got_type = Got_type(got_type + 1)) |
| 10458 | if (gsym->has_got_offset(got_type)) |
| 10459 | { |
| 10460 | unsigned int off = gsym->got_offset(got_type); |
| 10461 | if (got_type == GOT_TYPE_TLSGD) |
| 10462 | off += size / 8; |
| 10463 | if (off == got_indx * (size / 8)) |
| 10464 | { |
| 10465 | if (got_type == GOT_TYPE_TPREL) |
| 10466 | return -tp_offset; |
| 10467 | else |
| 10468 | return -dtp_offset; |
| 10469 | } |
| 10470 | } |
| 10471 | } |
| 10472 | gold_unreachable(); |
| 10473 | } |
| 10474 | |
| 10475 | // The selector for powerpc object files. |
| 10476 | |
| 10477 | template<int size, bool big_endian> |
| 10478 | class Target_selector_powerpc : public Target_selector |
| 10479 | { |
| 10480 | public: |
| 10481 | Target_selector_powerpc() |
| 10482 | : Target_selector(size == 64 ? elfcpp::EM_PPC64 : elfcpp::EM_PPC, |
| 10483 | size, big_endian, |
| 10484 | (size == 64 |
| 10485 | ? (big_endian ? "elf64-powerpc" : "elf64-powerpcle") |
| 10486 | : (big_endian ? "elf32-powerpc" : "elf32-powerpcle")), |
| 10487 | (size == 64 |
| 10488 | ? (big_endian ? "elf64ppc" : "elf64lppc") |
| 10489 | : (big_endian ? "elf32ppc" : "elf32lppc"))) |
| 10490 | { } |
| 10491 | |
| 10492 | virtual Target* |
| 10493 | do_instantiate_target() |
| 10494 | { return new Target_powerpc<size, big_endian>(); } |
| 10495 | }; |
| 10496 | |
| 10497 | Target_selector_powerpc<32, true> target_selector_ppc32; |
| 10498 | Target_selector_powerpc<32, false> target_selector_ppc32le; |
| 10499 | Target_selector_powerpc<64, true> target_selector_ppc64; |
| 10500 | Target_selector_powerpc<64, false> target_selector_ppc64le; |
| 10501 | |
| 10502 | // Instantiate these constants for -O0 |
| 10503 | template<int size, bool big_endian> |
| 10504 | const typename Output_data_glink<size, big_endian>::Address |
| 10505 | Output_data_glink<size, big_endian>::invalid_address; |
| 10506 | template<int size, bool big_endian> |
| 10507 | const typename Stub_table<size, big_endian>::Address |
| 10508 | Stub_table<size, big_endian>::invalid_address; |
| 10509 | template<int size, bool big_endian> |
| 10510 | const typename Target_powerpc<size, big_endian>::Address |
| 10511 | Target_powerpc<size, big_endian>::invalid_address; |
| 10512 | |
| 10513 | } // End anonymous namespace. |