| 1 | // powerpc.cc -- powerpc target support for gold. |
| 2 | |
| 3 | // Copyright (C) 2008-2016 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 | Output_section* output_section; |
| 74 | const Output_section::Input_section* owner; |
| 75 | }; |
| 76 | |
| 77 | inline bool |
| 78 | is_branch_reloc(unsigned int r_type); |
| 79 | |
| 80 | template<int size, bool big_endian> |
| 81 | class Powerpc_relobj : public Sized_relobj_file<size, big_endian> |
| 82 | { |
| 83 | public: |
| 84 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 85 | typedef Unordered_set<Section_id, Section_id_hash> Section_refs; |
| 86 | typedef Unordered_map<Address, Section_refs> Access_from; |
| 87 | |
| 88 | Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset, |
| 89 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| 90 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), |
| 91 | special_(0), has_small_toc_reloc_(false), opd_valid_(false), |
| 92 | opd_ent_(), access_from_map_(), has14_(), stub_table_index_(), |
| 93 | e_flags_(ehdr.get_e_flags()), st_other_() |
| 94 | { |
| 95 | this->set_abiversion(0); |
| 96 | } |
| 97 | |
| 98 | ~Powerpc_relobj() |
| 99 | { } |
| 100 | |
| 101 | // Read the symbols then set up st_other vector. |
| 102 | void |
| 103 | do_read_symbols(Read_symbols_data*); |
| 104 | |
| 105 | // The .got2 section shndx. |
| 106 | unsigned int |
| 107 | got2_shndx() const |
| 108 | { |
| 109 | if (size == 32) |
| 110 | return this->special_; |
| 111 | else |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | // The .opd section shndx. |
| 116 | unsigned int |
| 117 | opd_shndx() const |
| 118 | { |
| 119 | if (size == 32) |
| 120 | return 0; |
| 121 | else |
| 122 | return this->special_; |
| 123 | } |
| 124 | |
| 125 | // Init OPD entry arrays. |
| 126 | void |
| 127 | init_opd(size_t opd_size) |
| 128 | { |
| 129 | size_t count = this->opd_ent_ndx(opd_size); |
| 130 | this->opd_ent_.resize(count); |
| 131 | } |
| 132 | |
| 133 | // Return section and offset of function entry for .opd + R_OFF. |
| 134 | unsigned int |
| 135 | get_opd_ent(Address r_off, Address* value = NULL) const |
| 136 | { |
| 137 | size_t ndx = this->opd_ent_ndx(r_off); |
| 138 | gold_assert(ndx < this->opd_ent_.size()); |
| 139 | gold_assert(this->opd_ent_[ndx].shndx != 0); |
| 140 | if (value != NULL) |
| 141 | *value = this->opd_ent_[ndx].off; |
| 142 | return this->opd_ent_[ndx].shndx; |
| 143 | } |
| 144 | |
| 145 | // Set section and offset of function entry for .opd + R_OFF. |
| 146 | void |
| 147 | set_opd_ent(Address r_off, unsigned int shndx, Address value) |
| 148 | { |
| 149 | size_t ndx = this->opd_ent_ndx(r_off); |
| 150 | gold_assert(ndx < this->opd_ent_.size()); |
| 151 | this->opd_ent_[ndx].shndx = shndx; |
| 152 | this->opd_ent_[ndx].off = value; |
| 153 | } |
| 154 | |
| 155 | // Return discard flag for .opd + R_OFF. |
| 156 | bool |
| 157 | get_opd_discard(Address r_off) const |
| 158 | { |
| 159 | size_t ndx = this->opd_ent_ndx(r_off); |
| 160 | gold_assert(ndx < this->opd_ent_.size()); |
| 161 | return this->opd_ent_[ndx].discard; |
| 162 | } |
| 163 | |
| 164 | // Set discard flag for .opd + R_OFF. |
| 165 | void |
| 166 | set_opd_discard(Address r_off) |
| 167 | { |
| 168 | size_t ndx = this->opd_ent_ndx(r_off); |
| 169 | gold_assert(ndx < this->opd_ent_.size()); |
| 170 | this->opd_ent_[ndx].discard = true; |
| 171 | } |
| 172 | |
| 173 | bool |
| 174 | opd_valid() const |
| 175 | { return this->opd_valid_; } |
| 176 | |
| 177 | void |
| 178 | set_opd_valid() |
| 179 | { this->opd_valid_ = true; } |
| 180 | |
| 181 | // Examine .rela.opd to build info about function entry points. |
| 182 | void |
| 183 | scan_opd_relocs(size_t reloc_count, |
| 184 | const unsigned char* prelocs, |
| 185 | const unsigned char* plocal_syms); |
| 186 | |
| 187 | // Perform the Sized_relobj_file method, then set up opd info from |
| 188 | // .opd relocs. |
| 189 | void |
| 190 | do_read_relocs(Read_relocs_data*); |
| 191 | |
| 192 | bool |
| 193 | do_find_special_sections(Read_symbols_data* sd); |
| 194 | |
| 195 | // Adjust this local symbol value. Return false if the symbol |
| 196 | // should be discarded from the output file. |
| 197 | bool |
| 198 | do_adjust_local_symbol(Symbol_value<size>* lv) const |
| 199 | { |
| 200 | if (size == 64 && this->opd_shndx() != 0) |
| 201 | { |
| 202 | bool is_ordinary; |
| 203 | if (lv->input_shndx(&is_ordinary) != this->opd_shndx()) |
| 204 | return true; |
| 205 | if (this->get_opd_discard(lv->input_value())) |
| 206 | return false; |
| 207 | } |
| 208 | return true; |
| 209 | } |
| 210 | |
| 211 | Access_from* |
| 212 | access_from_map() |
| 213 | { return &this->access_from_map_; } |
| 214 | |
| 215 | // Add a reference from SRC_OBJ, SRC_INDX to this object's .opd |
| 216 | // section at DST_OFF. |
| 217 | void |
| 218 | add_reference(Relobj* src_obj, |
| 219 | unsigned int src_indx, |
| 220 | typename elfcpp::Elf_types<size>::Elf_Addr dst_off) |
| 221 | { |
| 222 | Section_id src_id(src_obj, src_indx); |
| 223 | this->access_from_map_[dst_off].insert(src_id); |
| 224 | } |
| 225 | |
| 226 | // Add a reference to the code section specified by the .opd entry |
| 227 | // at DST_OFF |
| 228 | void |
| 229 | add_gc_mark(typename elfcpp::Elf_types<size>::Elf_Addr dst_off) |
| 230 | { |
| 231 | size_t ndx = this->opd_ent_ndx(dst_off); |
| 232 | if (ndx >= this->opd_ent_.size()) |
| 233 | this->opd_ent_.resize(ndx + 1); |
| 234 | this->opd_ent_[ndx].gc_mark = true; |
| 235 | } |
| 236 | |
| 237 | void |
| 238 | process_gc_mark(Symbol_table* symtab) |
| 239 | { |
| 240 | for (size_t i = 0; i < this->opd_ent_.size(); i++) |
| 241 | if (this->opd_ent_[i].gc_mark) |
| 242 | { |
| 243 | unsigned int shndx = this->opd_ent_[i].shndx; |
| 244 | symtab->gc()->worklist().push_back(Section_id(this, shndx)); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | // Return offset in output GOT section that this object will use |
| 249 | // as a TOC pointer. Won't be just a constant with multi-toc support. |
| 250 | Address |
| 251 | toc_base_offset() const |
| 252 | { return 0x8000; } |
| 253 | |
| 254 | void |
| 255 | set_has_small_toc_reloc() |
| 256 | { has_small_toc_reloc_ = true; } |
| 257 | |
| 258 | bool |
| 259 | has_small_toc_reloc() const |
| 260 | { return has_small_toc_reloc_; } |
| 261 | |
| 262 | void |
| 263 | set_has_14bit_branch(unsigned int shndx) |
| 264 | { |
| 265 | if (shndx >= this->has14_.size()) |
| 266 | this->has14_.resize(shndx + 1); |
| 267 | this->has14_[shndx] = true; |
| 268 | } |
| 269 | |
| 270 | bool |
| 271 | has_14bit_branch(unsigned int shndx) const |
| 272 | { return shndx < this->has14_.size() && this->has14_[shndx]; } |
| 273 | |
| 274 | void |
| 275 | set_stub_table(unsigned int shndx, unsigned int stub_index) |
| 276 | { |
| 277 | if (shndx >= this->stub_table_index_.size()) |
| 278 | this->stub_table_index_.resize(shndx + 1); |
| 279 | this->stub_table_index_[shndx] = stub_index; |
| 280 | } |
| 281 | |
| 282 | Stub_table<size, big_endian>* |
| 283 | stub_table(unsigned int shndx) |
| 284 | { |
| 285 | if (shndx < this->stub_table_index_.size()) |
| 286 | { |
| 287 | Target_powerpc<size, big_endian>* target |
| 288 | = static_cast<Target_powerpc<size, big_endian>*>( |
| 289 | parameters->sized_target<size, big_endian>()); |
| 290 | unsigned int indx = this->stub_table_index_[shndx]; |
| 291 | gold_assert(indx < target->stub_tables().size()); |
| 292 | return target->stub_tables()[indx]; |
| 293 | } |
| 294 | return NULL; |
| 295 | } |
| 296 | |
| 297 | void |
| 298 | clear_stub_table() |
| 299 | { |
| 300 | this->stub_table_index_.clear(); |
| 301 | } |
| 302 | |
| 303 | int |
| 304 | abiversion() const |
| 305 | { return this->e_flags_ & elfcpp::EF_PPC64_ABI; } |
| 306 | |
| 307 | // Set ABI version for input and output |
| 308 | void |
| 309 | set_abiversion(int ver); |
| 310 | |
| 311 | unsigned int |
| 312 | ppc64_local_entry_offset(const Symbol* sym) const |
| 313 | { return elfcpp::ppc64_decode_local_entry(sym->nonvis() >> 3); } |
| 314 | |
| 315 | unsigned int |
| 316 | ppc64_local_entry_offset(unsigned int symndx) const |
| 317 | { return elfcpp::ppc64_decode_local_entry(this->st_other_[symndx] >> 5); } |
| 318 | |
| 319 | private: |
| 320 | struct Opd_ent |
| 321 | { |
| 322 | unsigned int shndx; |
| 323 | bool discard : 1; |
| 324 | bool gc_mark : 1; |
| 325 | Address off; |
| 326 | }; |
| 327 | |
| 328 | // Return index into opd_ent_ array for .opd entry at OFF. |
| 329 | // .opd entries are 24 bytes long, but they can be spaced 16 bytes |
| 330 | // apart when the language doesn't use the last 8-byte word, the |
| 331 | // environment pointer. Thus dividing the entry section offset by |
| 332 | // 16 will give an index into opd_ent_ that works for either layout |
| 333 | // of .opd. (It leaves some elements of the vector unused when .opd |
| 334 | // entries are spaced 24 bytes apart, but we don't know the spacing |
| 335 | // until relocations are processed, and in any case it is possible |
| 336 | // for an object to have some entries spaced 16 bytes apart and |
| 337 | // others 24 bytes apart.) |
| 338 | size_t |
| 339 | opd_ent_ndx(size_t off) const |
| 340 | { return off >> 4;} |
| 341 | |
| 342 | // For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx. |
| 343 | unsigned int special_; |
| 344 | |
| 345 | // For 64-bit, whether this object uses small model relocs to access |
| 346 | // the toc. |
| 347 | bool has_small_toc_reloc_; |
| 348 | |
| 349 | // Set at the start of gc_process_relocs, when we know opd_ent_ |
| 350 | // vector is valid. The flag could be made atomic and set in |
| 351 | // do_read_relocs with memory_order_release and then tested with |
| 352 | // memory_order_acquire, potentially resulting in fewer entries in |
| 353 | // access_from_map_. |
| 354 | bool opd_valid_; |
| 355 | |
| 356 | // The first 8-byte word of an OPD entry gives the address of the |
| 357 | // entry point of the function. Relocatable object files have a |
| 358 | // relocation on this word. The following vector records the |
| 359 | // section and offset specified by these relocations. |
| 360 | std::vector<Opd_ent> opd_ent_; |
| 361 | |
| 362 | // References made to this object's .opd section when running |
| 363 | // gc_process_relocs for another object, before the opd_ent_ vector |
| 364 | // is valid for this object. |
| 365 | Access_from access_from_map_; |
| 366 | |
| 367 | // Whether input section has a 14-bit branch reloc. |
| 368 | std::vector<bool> has14_; |
| 369 | |
| 370 | // The stub table to use for a given input section. |
| 371 | std::vector<unsigned int> stub_table_index_; |
| 372 | |
| 373 | // Header e_flags |
| 374 | elfcpp::Elf_Word e_flags_; |
| 375 | |
| 376 | // ELF st_other field for local symbols. |
| 377 | std::vector<unsigned char> st_other_; |
| 378 | }; |
| 379 | |
| 380 | template<int size, bool big_endian> |
| 381 | class Powerpc_dynobj : public Sized_dynobj<size, big_endian> |
| 382 | { |
| 383 | public: |
| 384 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 385 | |
| 386 | Powerpc_dynobj(const std::string& name, Input_file* input_file, off_t offset, |
| 387 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| 388 | : Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr), |
| 389 | opd_shndx_(0), opd_ent_(), e_flags_(ehdr.get_e_flags()) |
| 390 | { |
| 391 | this->set_abiversion(0); |
| 392 | } |
| 393 | |
| 394 | ~Powerpc_dynobj() |
| 395 | { } |
| 396 | |
| 397 | // Call Sized_dynobj::do_read_symbols to read the symbols then |
| 398 | // read .opd from a dynamic object, filling in opd_ent_ vector, |
| 399 | void |
| 400 | do_read_symbols(Read_symbols_data*); |
| 401 | |
| 402 | // The .opd section shndx. |
| 403 | unsigned int |
| 404 | opd_shndx() const |
| 405 | { |
| 406 | return this->opd_shndx_; |
| 407 | } |
| 408 | |
| 409 | // The .opd section address. |
| 410 | Address |
| 411 | opd_address() const |
| 412 | { |
| 413 | return this->opd_address_; |
| 414 | } |
| 415 | |
| 416 | // Init OPD entry arrays. |
| 417 | void |
| 418 | init_opd(size_t opd_size) |
| 419 | { |
| 420 | size_t count = this->opd_ent_ndx(opd_size); |
| 421 | this->opd_ent_.resize(count); |
| 422 | } |
| 423 | |
| 424 | // Return section and offset of function entry for .opd + R_OFF. |
| 425 | unsigned int |
| 426 | get_opd_ent(Address r_off, Address* value = NULL) const |
| 427 | { |
| 428 | size_t ndx = this->opd_ent_ndx(r_off); |
| 429 | gold_assert(ndx < this->opd_ent_.size()); |
| 430 | gold_assert(this->opd_ent_[ndx].shndx != 0); |
| 431 | if (value != NULL) |
| 432 | *value = this->opd_ent_[ndx].off; |
| 433 | return this->opd_ent_[ndx].shndx; |
| 434 | } |
| 435 | |
| 436 | // Set section and offset of function entry for .opd + R_OFF. |
| 437 | void |
| 438 | set_opd_ent(Address r_off, unsigned int shndx, Address value) |
| 439 | { |
| 440 | size_t ndx = this->opd_ent_ndx(r_off); |
| 441 | gold_assert(ndx < this->opd_ent_.size()); |
| 442 | this->opd_ent_[ndx].shndx = shndx; |
| 443 | this->opd_ent_[ndx].off = value; |
| 444 | } |
| 445 | |
| 446 | int |
| 447 | abiversion() const |
| 448 | { return this->e_flags_ & elfcpp::EF_PPC64_ABI; } |
| 449 | |
| 450 | // Set ABI version for input and output. |
| 451 | void |
| 452 | set_abiversion(int ver); |
| 453 | |
| 454 | private: |
| 455 | // Used to specify extent of executable sections. |
| 456 | struct Sec_info |
| 457 | { |
| 458 | Sec_info(Address start_, Address len_, unsigned int shndx_) |
| 459 | : start(start_), len(len_), shndx(shndx_) |
| 460 | { } |
| 461 | |
| 462 | bool |
| 463 | operator<(const Sec_info& that) const |
| 464 | { return this->start < that.start; } |
| 465 | |
| 466 | Address start; |
| 467 | Address len; |
| 468 | unsigned int shndx; |
| 469 | }; |
| 470 | |
| 471 | struct Opd_ent |
| 472 | { |
| 473 | unsigned int shndx; |
| 474 | Address off; |
| 475 | }; |
| 476 | |
| 477 | // Return index into opd_ent_ array for .opd entry at OFF. |
| 478 | size_t |
| 479 | opd_ent_ndx(size_t off) const |
| 480 | { return off >> 4;} |
| 481 | |
| 482 | // For 64-bit the .opd section shndx and address. |
| 483 | unsigned int opd_shndx_; |
| 484 | Address opd_address_; |
| 485 | |
| 486 | // The first 8-byte word of an OPD entry gives the address of the |
| 487 | // entry point of the function. Records the section and offset |
| 488 | // corresponding to the address. Note that in dynamic objects, |
| 489 | // offset is *not* relative to the section. |
| 490 | std::vector<Opd_ent> opd_ent_; |
| 491 | |
| 492 | // Header e_flags |
| 493 | elfcpp::Elf_Word e_flags_; |
| 494 | }; |
| 495 | |
| 496 | template<int size, bool big_endian> |
| 497 | class Target_powerpc : public Sized_target<size, big_endian> |
| 498 | { |
| 499 | public: |
| 500 | typedef |
| 501 | Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section; |
| 502 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 503 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword Signed_address; |
| 504 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 505 | // Offset of tp and dtp pointers from start of TLS block. |
| 506 | static const Address tp_offset = 0x7000; |
| 507 | static const Address dtp_offset = 0x8000; |
| 508 | |
| 509 | Target_powerpc() |
| 510 | : Sized_target<size, big_endian>(&powerpc_info), |
| 511 | got_(NULL), plt_(NULL), iplt_(NULL), brlt_section_(NULL), |
| 512 | glink_(NULL), rela_dyn_(NULL), copy_relocs_(elfcpp::R_POWERPC_COPY), |
| 513 | tlsld_got_offset_(-1U), |
| 514 | stub_tables_(), branch_lookup_table_(), branch_info_(), |
| 515 | plt_thread_safe_(false), relax_failed_(false), relax_fail_count_(0), |
| 516 | stub_group_size_(0), savres_section_(0) |
| 517 | { |
| 518 | } |
| 519 | |
| 520 | // Process the relocations to determine unreferenced sections for |
| 521 | // garbage collection. |
| 522 | void |
| 523 | gc_process_relocs(Symbol_table* symtab, |
| 524 | Layout* layout, |
| 525 | Sized_relobj_file<size, big_endian>* object, |
| 526 | unsigned int data_shndx, |
| 527 | unsigned int sh_type, |
| 528 | const unsigned char* prelocs, |
| 529 | size_t reloc_count, |
| 530 | Output_section* output_section, |
| 531 | bool needs_special_offset_handling, |
| 532 | size_t local_symbol_count, |
| 533 | const unsigned char* plocal_symbols); |
| 534 | |
| 535 | // Scan the relocations to look for symbol adjustments. |
| 536 | void |
| 537 | scan_relocs(Symbol_table* symtab, |
| 538 | Layout* layout, |
| 539 | Sized_relobj_file<size, big_endian>* object, |
| 540 | unsigned int data_shndx, |
| 541 | unsigned int sh_type, |
| 542 | const unsigned char* prelocs, |
| 543 | size_t reloc_count, |
| 544 | Output_section* output_section, |
| 545 | bool needs_special_offset_handling, |
| 546 | size_t local_symbol_count, |
| 547 | const unsigned char* plocal_symbols); |
| 548 | |
| 549 | // Map input .toc section to output .got section. |
| 550 | const char* |
| 551 | do_output_section_name(const Relobj*, const char* name, size_t* plen) const |
| 552 | { |
| 553 | if (size == 64 && strcmp(name, ".toc") == 0) |
| 554 | { |
| 555 | *plen = 4; |
| 556 | return ".got"; |
| 557 | } |
| 558 | return NULL; |
| 559 | } |
| 560 | |
| 561 | // Provide linker defined save/restore functions. |
| 562 | void |
| 563 | define_save_restore_funcs(Layout*, Symbol_table*); |
| 564 | |
| 565 | // No stubs unless a final link. |
| 566 | bool |
| 567 | do_may_relax() const |
| 568 | { return !parameters->options().relocatable(); } |
| 569 | |
| 570 | bool |
| 571 | do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*); |
| 572 | |
| 573 | void |
| 574 | do_plt_fde_location(const Output_data*, unsigned char*, |
| 575 | uint64_t*, off_t*) const; |
| 576 | |
| 577 | // Stash info about branches, for stub generation. |
| 578 | void |
| 579 | push_branch(Powerpc_relobj<size, big_endian>* ppc_object, |
| 580 | unsigned int data_shndx, Address r_offset, |
| 581 | unsigned int r_type, unsigned int r_sym, Address addend) |
| 582 | { |
| 583 | Branch_info info(ppc_object, data_shndx, r_offset, r_type, r_sym, addend); |
| 584 | this->branch_info_.push_back(info); |
| 585 | if (r_type == elfcpp::R_POWERPC_REL14 |
| 586 | || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN |
| 587 | || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN) |
| 588 | ppc_object->set_has_14bit_branch(data_shndx); |
| 589 | } |
| 590 | |
| 591 | void |
| 592 | do_define_standard_symbols(Symbol_table*, Layout*); |
| 593 | |
| 594 | // Finalize the sections. |
| 595 | void |
| 596 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
| 597 | |
| 598 | // Return the value to use for a dynamic which requires special |
| 599 | // treatment. |
| 600 | uint64_t |
| 601 | do_dynsym_value(const Symbol*) const; |
| 602 | |
| 603 | // Return the PLT address to use for a local symbol. |
| 604 | uint64_t |
| 605 | do_plt_address_for_local(const Relobj*, unsigned int) const; |
| 606 | |
| 607 | // Return the PLT address to use for a global symbol. |
| 608 | uint64_t |
| 609 | do_plt_address_for_global(const Symbol*) const; |
| 610 | |
| 611 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 612 | // for a local tls symbol specified by OBJECT, SYMNDX. |
| 613 | int64_t |
| 614 | do_tls_offset_for_local(const Relobj* object, |
| 615 | unsigned int symndx, |
| 616 | unsigned int got_indx) const; |
| 617 | |
| 618 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 619 | // for global tls symbol GSYM. |
| 620 | int64_t |
| 621 | do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const; |
| 622 | |
| 623 | void |
| 624 | do_function_location(Symbol_location*) const; |
| 625 | |
| 626 | bool |
| 627 | do_can_check_for_function_pointers() const |
| 628 | { return true; } |
| 629 | |
| 630 | // Adjust -fsplit-stack code which calls non-split-stack code. |
| 631 | void |
| 632 | do_calls_non_split(Relobj* object, unsigned int shndx, |
| 633 | section_offset_type fnoffset, section_size_type fnsize, |
| 634 | const unsigned char* prelocs, size_t reloc_count, |
| 635 | unsigned char* view, section_size_type view_size, |
| 636 | std::string* from, std::string* to) const; |
| 637 | |
| 638 | // Relocate a section. |
| 639 | void |
| 640 | relocate_section(const Relocate_info<size, big_endian>*, |
| 641 | unsigned int sh_type, |
| 642 | const unsigned char* prelocs, |
| 643 | size_t reloc_count, |
| 644 | Output_section* output_section, |
| 645 | bool needs_special_offset_handling, |
| 646 | unsigned char* view, |
| 647 | Address view_address, |
| 648 | section_size_type view_size, |
| 649 | const Reloc_symbol_changes*); |
| 650 | |
| 651 | // Scan the relocs during a relocatable link. |
| 652 | void |
| 653 | scan_relocatable_relocs(Symbol_table* symtab, |
| 654 | Layout* layout, |
| 655 | Sized_relobj_file<size, big_endian>* object, |
| 656 | unsigned int data_shndx, |
| 657 | unsigned int sh_type, |
| 658 | const unsigned char* prelocs, |
| 659 | size_t reloc_count, |
| 660 | Output_section* output_section, |
| 661 | bool needs_special_offset_handling, |
| 662 | size_t local_symbol_count, |
| 663 | const unsigned char* plocal_symbols, |
| 664 | Relocatable_relocs*); |
| 665 | |
| 666 | // Scan the relocs for --emit-relocs. |
| 667 | void |
| 668 | emit_relocs_scan(Symbol_table* symtab, |
| 669 | Layout* layout, |
| 670 | Sized_relobj_file<size, big_endian>* object, |
| 671 | unsigned int data_shndx, |
| 672 | unsigned int sh_type, |
| 673 | const unsigned char* prelocs, |
| 674 | size_t reloc_count, |
| 675 | Output_section* output_section, |
| 676 | bool needs_special_offset_handling, |
| 677 | size_t local_symbol_count, |
| 678 | const unsigned char* plocal_syms, |
| 679 | Relocatable_relocs* rr); |
| 680 | |
| 681 | // Emit relocations for a section. |
| 682 | void |
| 683 | relocate_relocs(const Relocate_info<size, big_endian>*, |
| 684 | unsigned int sh_type, |
| 685 | const unsigned char* prelocs, |
| 686 | size_t reloc_count, |
| 687 | Output_section* output_section, |
| 688 | typename elfcpp::Elf_types<size>::Elf_Off |
| 689 | offset_in_output_section, |
| 690 | unsigned char*, |
| 691 | Address view_address, |
| 692 | section_size_type, |
| 693 | unsigned char* reloc_view, |
| 694 | section_size_type reloc_view_size); |
| 695 | |
| 696 | // Return whether SYM is defined by the ABI. |
| 697 | bool |
| 698 | do_is_defined_by_abi(const Symbol* sym) const |
| 699 | { |
| 700 | return strcmp(sym->name(), "__tls_get_addr") == 0; |
| 701 | } |
| 702 | |
| 703 | // Return the size of the GOT section. |
| 704 | section_size_type |
| 705 | got_size() const |
| 706 | { |
| 707 | gold_assert(this->got_ != NULL); |
| 708 | return this->got_->data_size(); |
| 709 | } |
| 710 | |
| 711 | // Get the PLT section. |
| 712 | const Output_data_plt_powerpc<size, big_endian>* |
| 713 | plt_section() const |
| 714 | { |
| 715 | gold_assert(this->plt_ != NULL); |
| 716 | return this->plt_; |
| 717 | } |
| 718 | |
| 719 | // Get the IPLT section. |
| 720 | const Output_data_plt_powerpc<size, big_endian>* |
| 721 | iplt_section() const |
| 722 | { |
| 723 | gold_assert(this->iplt_ != NULL); |
| 724 | return this->iplt_; |
| 725 | } |
| 726 | |
| 727 | // Get the .glink section. |
| 728 | const Output_data_glink<size, big_endian>* |
| 729 | glink_section() const |
| 730 | { |
| 731 | gold_assert(this->glink_ != NULL); |
| 732 | return this->glink_; |
| 733 | } |
| 734 | |
| 735 | Output_data_glink<size, big_endian>* |
| 736 | glink_section() |
| 737 | { |
| 738 | gold_assert(this->glink_ != NULL); |
| 739 | return this->glink_; |
| 740 | } |
| 741 | |
| 742 | bool has_glink() const |
| 743 | { return this->glink_ != NULL; } |
| 744 | |
| 745 | // Get the GOT section. |
| 746 | const Output_data_got_powerpc<size, big_endian>* |
| 747 | got_section() const |
| 748 | { |
| 749 | gold_assert(this->got_ != NULL); |
| 750 | return this->got_; |
| 751 | } |
| 752 | |
| 753 | // Get the GOT section, creating it if necessary. |
| 754 | Output_data_got_powerpc<size, big_endian>* |
| 755 | got_section(Symbol_table*, Layout*); |
| 756 | |
| 757 | Object* |
| 758 | do_make_elf_object(const std::string&, Input_file*, off_t, |
| 759 | const elfcpp::Ehdr<size, big_endian>&); |
| 760 | |
| 761 | // Return the number of entries in the GOT. |
| 762 | unsigned int |
| 763 | got_entry_count() const |
| 764 | { |
| 765 | if (this->got_ == NULL) |
| 766 | return 0; |
| 767 | return this->got_size() / (size / 8); |
| 768 | } |
| 769 | |
| 770 | // Return the number of entries in the PLT. |
| 771 | unsigned int |
| 772 | plt_entry_count() const; |
| 773 | |
| 774 | // Return the offset of the first non-reserved PLT entry. |
| 775 | unsigned int |
| 776 | first_plt_entry_offset() const |
| 777 | { |
| 778 | if (size == 32) |
| 779 | return 0; |
| 780 | if (this->abiversion() >= 2) |
| 781 | return 16; |
| 782 | return 24; |
| 783 | } |
| 784 | |
| 785 | // Return the size of each PLT entry. |
| 786 | unsigned int |
| 787 | plt_entry_size() const |
| 788 | { |
| 789 | if (size == 32) |
| 790 | return 4; |
| 791 | if (this->abiversion() >= 2) |
| 792 | return 8; |
| 793 | return 24; |
| 794 | } |
| 795 | |
| 796 | Output_data_save_res<size, big_endian>* |
| 797 | savres_section() const |
| 798 | { |
| 799 | return this->savres_section_; |
| 800 | } |
| 801 | |
| 802 | // Add any special sections for this symbol to the gc work list. |
| 803 | // For powerpc64, this adds the code section of a function |
| 804 | // descriptor. |
| 805 | void |
| 806 | do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const; |
| 807 | |
| 808 | // Handle target specific gc actions when adding a gc reference from |
| 809 | // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX |
| 810 | // and DST_OFF. For powerpc64, this adds a referenc to the code |
| 811 | // section of a function descriptor. |
| 812 | void |
| 813 | do_gc_add_reference(Symbol_table* symtab, |
| 814 | Relobj* src_obj, |
| 815 | unsigned int src_shndx, |
| 816 | Relobj* dst_obj, |
| 817 | unsigned int dst_shndx, |
| 818 | Address dst_off) const; |
| 819 | |
| 820 | typedef std::vector<Stub_table<size, big_endian>*> Stub_tables; |
| 821 | const Stub_tables& |
| 822 | stub_tables() const |
| 823 | { return this->stub_tables_; } |
| 824 | |
| 825 | const Output_data_brlt_powerpc<size, big_endian>* |
| 826 | brlt_section() const |
| 827 | { return this->brlt_section_; } |
| 828 | |
| 829 | void |
| 830 | add_branch_lookup_table(Address to) |
| 831 | { |
| 832 | unsigned int off = this->branch_lookup_table_.size() * (size / 8); |
| 833 | this->branch_lookup_table_.insert(std::make_pair(to, off)); |
| 834 | } |
| 835 | |
| 836 | Address |
| 837 | find_branch_lookup_table(Address to) |
| 838 | { |
| 839 | typename Branch_lookup_table::const_iterator p |
| 840 | = this->branch_lookup_table_.find(to); |
| 841 | return p == this->branch_lookup_table_.end() ? invalid_address : p->second; |
| 842 | } |
| 843 | |
| 844 | void |
| 845 | write_branch_lookup_table(unsigned char *oview) |
| 846 | { |
| 847 | for (typename Branch_lookup_table::const_iterator p |
| 848 | = this->branch_lookup_table_.begin(); |
| 849 | p != this->branch_lookup_table_.end(); |
| 850 | ++p) |
| 851 | { |
| 852 | elfcpp::Swap<size, big_endian>::writeval(oview + p->second, p->first); |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | bool |
| 857 | plt_thread_safe() const |
| 858 | { return this->plt_thread_safe_; } |
| 859 | |
| 860 | int |
| 861 | abiversion () const |
| 862 | { return this->processor_specific_flags() & elfcpp::EF_PPC64_ABI; } |
| 863 | |
| 864 | void |
| 865 | set_abiversion (int ver) |
| 866 | { |
| 867 | elfcpp::Elf_Word flags = this->processor_specific_flags(); |
| 868 | flags &= ~elfcpp::EF_PPC64_ABI; |
| 869 | flags |= ver & elfcpp::EF_PPC64_ABI; |
| 870 | this->set_processor_specific_flags(flags); |
| 871 | } |
| 872 | |
| 873 | // Offset to to save stack slot |
| 874 | int |
| 875 | stk_toc () const |
| 876 | { return this->abiversion() < 2 ? 40 : 24; } |
| 877 | |
| 878 | private: |
| 879 | |
| 880 | class Track_tls |
| 881 | { |
| 882 | public: |
| 883 | enum Tls_get_addr |
| 884 | { |
| 885 | NOT_EXPECTED = 0, |
| 886 | EXPECTED = 1, |
| 887 | SKIP = 2, |
| 888 | NORMAL = 3 |
| 889 | }; |
| 890 | |
| 891 | Track_tls() |
| 892 | : tls_get_addr_(NOT_EXPECTED), |
| 893 | relinfo_(NULL), relnum_(0), r_offset_(0) |
| 894 | { } |
| 895 | |
| 896 | ~Track_tls() |
| 897 | { |
| 898 | if (this->tls_get_addr_ != NOT_EXPECTED) |
| 899 | this->missing(); |
| 900 | } |
| 901 | |
| 902 | void |
| 903 | missing(void) |
| 904 | { |
| 905 | if (this->relinfo_ != NULL) |
| 906 | gold_error_at_location(this->relinfo_, this->relnum_, this->r_offset_, |
| 907 | _("missing expected __tls_get_addr call")); |
| 908 | } |
| 909 | |
| 910 | void |
| 911 | expect_tls_get_addr_call( |
| 912 | const Relocate_info<size, big_endian>* relinfo, |
| 913 | size_t relnum, |
| 914 | Address r_offset) |
| 915 | { |
| 916 | this->tls_get_addr_ = EXPECTED; |
| 917 | this->relinfo_ = relinfo; |
| 918 | this->relnum_ = relnum; |
| 919 | this->r_offset_ = r_offset; |
| 920 | } |
| 921 | |
| 922 | void |
| 923 | expect_tls_get_addr_call() |
| 924 | { this->tls_get_addr_ = EXPECTED; } |
| 925 | |
| 926 | void |
| 927 | skip_next_tls_get_addr_call() |
| 928 | {this->tls_get_addr_ = SKIP; } |
| 929 | |
| 930 | Tls_get_addr |
| 931 | maybe_skip_tls_get_addr_call(unsigned int r_type, const Symbol* gsym) |
| 932 | { |
| 933 | bool is_tls_call = ((r_type == elfcpp::R_POWERPC_REL24 |
| 934 | || r_type == elfcpp::R_PPC_PLTREL24) |
| 935 | && gsym != NULL |
| 936 | && strcmp(gsym->name(), "__tls_get_addr") == 0); |
| 937 | Tls_get_addr last_tls = this->tls_get_addr_; |
| 938 | this->tls_get_addr_ = NOT_EXPECTED; |
| 939 | if (is_tls_call && last_tls != EXPECTED) |
| 940 | return last_tls; |
| 941 | else if (!is_tls_call && last_tls != NOT_EXPECTED) |
| 942 | { |
| 943 | this->missing(); |
| 944 | return EXPECTED; |
| 945 | } |
| 946 | return NORMAL; |
| 947 | } |
| 948 | |
| 949 | private: |
| 950 | // What we're up to regarding calls to __tls_get_addr. |
| 951 | // On powerpc, the branch and link insn making a call to |
| 952 | // __tls_get_addr is marked with a relocation, R_PPC64_TLSGD, |
| 953 | // R_PPC64_TLSLD, R_PPC_TLSGD or R_PPC_TLSLD, in addition to the |
| 954 | // usual R_POWERPC_REL24 or R_PPC_PLTREL25 relocation on a call. |
| 955 | // The marker relocation always comes first, and has the same |
| 956 | // symbol as the reloc on the insn setting up the __tls_get_addr |
| 957 | // argument. This ties the arg setup insn with the call insn, |
| 958 | // allowing ld to safely optimize away the call. We check that |
| 959 | // every call to __tls_get_addr has a marker relocation, and that |
| 960 | // every marker relocation is on a call to __tls_get_addr. |
| 961 | Tls_get_addr tls_get_addr_; |
| 962 | // Info about the last reloc for error message. |
| 963 | const Relocate_info<size, big_endian>* relinfo_; |
| 964 | size_t relnum_; |
| 965 | Address r_offset_; |
| 966 | }; |
| 967 | |
| 968 | // The class which scans relocations. |
| 969 | class Scan : protected Track_tls |
| 970 | { |
| 971 | public: |
| 972 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 973 | |
| 974 | Scan() |
| 975 | : Track_tls(), issued_non_pic_error_(false) |
| 976 | { } |
| 977 | |
| 978 | static inline int |
| 979 | get_reference_flags(unsigned int r_type, const Target_powerpc* target); |
| 980 | |
| 981 | inline void |
| 982 | local(Symbol_table* symtab, Layout* layout, Target_powerpc* target, |
| 983 | Sized_relobj_file<size, big_endian>* object, |
| 984 | unsigned int data_shndx, |
| 985 | Output_section* output_section, |
| 986 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 987 | const elfcpp::Sym<size, big_endian>& lsym, |
| 988 | bool is_discarded); |
| 989 | |
| 990 | inline void |
| 991 | global(Symbol_table* symtab, Layout* layout, Target_powerpc* target, |
| 992 | Sized_relobj_file<size, big_endian>* object, |
| 993 | unsigned int data_shndx, |
| 994 | Output_section* output_section, |
| 995 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 996 | Symbol* gsym); |
| 997 | |
| 998 | inline bool |
| 999 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 1000 | Target_powerpc* , |
| 1001 | Sized_relobj_file<size, big_endian>* relobj, |
| 1002 | unsigned int , |
| 1003 | Output_section* , |
| 1004 | const elfcpp::Rela<size, big_endian>& , |
| 1005 | unsigned int r_type, |
| 1006 | const elfcpp::Sym<size, big_endian>&) |
| 1007 | { |
| 1008 | // PowerPC64 .opd is not folded, so any identical function text |
| 1009 | // may be folded and we'll still keep function addresses distinct. |
| 1010 | // That means no reloc is of concern here. |
| 1011 | if (size == 64) |
| 1012 | { |
| 1013 | Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 1014 | <Powerpc_relobj<size, big_endian>*>(relobj); |
| 1015 | if (ppcobj->abiversion() == 1) |
| 1016 | return false; |
| 1017 | } |
| 1018 | // For 32-bit and ELFv2, conservatively assume anything but calls to |
| 1019 | // function code might be taking the address of the function. |
| 1020 | return !is_branch_reloc(r_type); |
| 1021 | } |
| 1022 | |
| 1023 | inline bool |
| 1024 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 1025 | Target_powerpc* , |
| 1026 | Sized_relobj_file<size, big_endian>* relobj, |
| 1027 | unsigned int , |
| 1028 | Output_section* , |
| 1029 | const elfcpp::Rela<size, big_endian>& , |
| 1030 | unsigned int r_type, |
| 1031 | Symbol*) |
| 1032 | { |
| 1033 | // As above. |
| 1034 | if (size == 64) |
| 1035 | { |
| 1036 | Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 1037 | <Powerpc_relobj<size, big_endian>*>(relobj); |
| 1038 | if (ppcobj->abiversion() == 1) |
| 1039 | return false; |
| 1040 | } |
| 1041 | return !is_branch_reloc(r_type); |
| 1042 | } |
| 1043 | |
| 1044 | static bool |
| 1045 | reloc_needs_plt_for_ifunc(Target_powerpc<size, big_endian>* target, |
| 1046 | Sized_relobj_file<size, big_endian>* object, |
| 1047 | unsigned int r_type, bool report_err); |
| 1048 | |
| 1049 | private: |
| 1050 | static void |
| 1051 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, |
| 1052 | unsigned int r_type); |
| 1053 | |
| 1054 | static void |
| 1055 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, |
| 1056 | unsigned int r_type, Symbol*); |
| 1057 | |
| 1058 | static void |
| 1059 | generate_tls_call(Symbol_table* symtab, Layout* layout, |
| 1060 | Target_powerpc* target); |
| 1061 | |
| 1062 | void |
| 1063 | check_non_pic(Relobj*, unsigned int r_type); |
| 1064 | |
| 1065 | // Whether we have issued an error about a non-PIC compilation. |
| 1066 | bool issued_non_pic_error_; |
| 1067 | }; |
| 1068 | |
| 1069 | bool |
| 1070 | symval_for_branch(const Symbol_table* symtab, |
| 1071 | const Sized_symbol<size>* gsym, |
| 1072 | Powerpc_relobj<size, big_endian>* object, |
| 1073 | Address *value, unsigned int *dest_shndx); |
| 1074 | |
| 1075 | // The class which implements relocation. |
| 1076 | class Relocate : protected Track_tls |
| 1077 | { |
| 1078 | public: |
| 1079 | // Use 'at' branch hints when true, 'y' when false. |
| 1080 | // FIXME maybe: set this with an option. |
| 1081 | static const bool is_isa_v2 = true; |
| 1082 | |
| 1083 | Relocate() |
| 1084 | : Track_tls() |
| 1085 | { } |
| 1086 | |
| 1087 | // Do a relocation. Return false if the caller should not issue |
| 1088 | // any warnings about this relocation. |
| 1089 | inline bool |
| 1090 | relocate(const Relocate_info<size, big_endian>*, unsigned int, |
| 1091 | Target_powerpc*, Output_section*, size_t, const unsigned char*, |
| 1092 | const Sized_symbol<size>*, const Symbol_value<size>*, |
| 1093 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
| 1094 | section_size_type); |
| 1095 | }; |
| 1096 | |
| 1097 | class Relocate_comdat_behavior |
| 1098 | { |
| 1099 | public: |
| 1100 | // Decide what the linker should do for relocations that refer to |
| 1101 | // discarded comdat sections. |
| 1102 | inline Comdat_behavior |
| 1103 | get(const char* name) |
| 1104 | { |
| 1105 | gold::Default_comdat_behavior default_behavior; |
| 1106 | Comdat_behavior ret = default_behavior.get(name); |
| 1107 | if (ret == CB_WARNING) |
| 1108 | { |
| 1109 | if (size == 32 |
| 1110 | && (strcmp(name, ".fixup") == 0 |
| 1111 | || strcmp(name, ".got2") == 0)) |
| 1112 | ret = CB_IGNORE; |
| 1113 | if (size == 64 |
| 1114 | && (strcmp(name, ".opd") == 0 |
| 1115 | || strcmp(name, ".toc") == 0 |
| 1116 | || strcmp(name, ".toc1") == 0)) |
| 1117 | ret = CB_IGNORE; |
| 1118 | } |
| 1119 | return ret; |
| 1120 | } |
| 1121 | }; |
| 1122 | |
| 1123 | // Optimize the TLS relocation type based on what we know about the |
| 1124 | // symbol. IS_FINAL is true if the final address of this symbol is |
| 1125 | // known at link time. |
| 1126 | |
| 1127 | tls::Tls_optimization |
| 1128 | optimize_tls_gd(bool is_final) |
| 1129 | { |
| 1130 | // If we are generating a shared library, then we can't do anything |
| 1131 | // in the linker. |
| 1132 | if (parameters->options().shared()) |
| 1133 | return tls::TLSOPT_NONE; |
| 1134 | |
| 1135 | if (!is_final) |
| 1136 | return tls::TLSOPT_TO_IE; |
| 1137 | return tls::TLSOPT_TO_LE; |
| 1138 | } |
| 1139 | |
| 1140 | tls::Tls_optimization |
| 1141 | optimize_tls_ld() |
| 1142 | { |
| 1143 | if (parameters->options().shared()) |
| 1144 | return tls::TLSOPT_NONE; |
| 1145 | |
| 1146 | return tls::TLSOPT_TO_LE; |
| 1147 | } |
| 1148 | |
| 1149 | tls::Tls_optimization |
| 1150 | optimize_tls_ie(bool is_final) |
| 1151 | { |
| 1152 | if (!is_final || parameters->options().shared()) |
| 1153 | return tls::TLSOPT_NONE; |
| 1154 | |
| 1155 | return tls::TLSOPT_TO_LE; |
| 1156 | } |
| 1157 | |
| 1158 | // Create glink. |
| 1159 | void |
| 1160 | make_glink_section(Layout*); |
| 1161 | |
| 1162 | // Create the PLT section. |
| 1163 | void |
| 1164 | make_plt_section(Symbol_table*, Layout*); |
| 1165 | |
| 1166 | void |
| 1167 | make_iplt_section(Symbol_table*, Layout*); |
| 1168 | |
| 1169 | void |
| 1170 | make_brlt_section(Layout*); |
| 1171 | |
| 1172 | // Create a PLT entry for a global symbol. |
| 1173 | void |
| 1174 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
| 1175 | |
| 1176 | // Create a PLT entry for a local IFUNC symbol. |
| 1177 | void |
| 1178 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, |
| 1179 | Sized_relobj_file<size, big_endian>*, |
| 1180 | unsigned int); |
| 1181 | |
| 1182 | |
| 1183 | // Create a GOT entry for local dynamic __tls_get_addr. |
| 1184 | unsigned int |
| 1185 | tlsld_got_offset(Symbol_table* symtab, Layout* layout, |
| 1186 | Sized_relobj_file<size, big_endian>* object); |
| 1187 | |
| 1188 | unsigned int |
| 1189 | tlsld_got_offset() const |
| 1190 | { |
| 1191 | return this->tlsld_got_offset_; |
| 1192 | } |
| 1193 | |
| 1194 | // Get the dynamic reloc section, creating it if necessary. |
| 1195 | Reloc_section* |
| 1196 | rela_dyn_section(Layout*); |
| 1197 | |
| 1198 | // Similarly, but for ifunc symbols get the one for ifunc. |
| 1199 | Reloc_section* |
| 1200 | rela_dyn_section(Symbol_table*, Layout*, bool for_ifunc); |
| 1201 | |
| 1202 | // Copy a relocation against a global symbol. |
| 1203 | void |
| 1204 | copy_reloc(Symbol_table* symtab, Layout* layout, |
| 1205 | Sized_relobj_file<size, big_endian>* object, |
| 1206 | unsigned int shndx, Output_section* output_section, |
| 1207 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) |
| 1208 | { |
| 1209 | unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info()); |
| 1210 | this->copy_relocs_.copy_reloc(symtab, layout, |
| 1211 | symtab->get_sized_symbol<size>(sym), |
| 1212 | object, shndx, output_section, |
| 1213 | r_type, reloc.get_r_offset(), |
| 1214 | reloc.get_r_addend(), |
| 1215 | this->rela_dyn_section(layout)); |
| 1216 | } |
| 1217 | |
| 1218 | // Look over all the input sections, deciding where to place stubs. |
| 1219 | void |
| 1220 | group_sections(Layout*, const Task*, bool); |
| 1221 | |
| 1222 | // Sort output sections by address. |
| 1223 | struct Sort_sections |
| 1224 | { |
| 1225 | bool |
| 1226 | operator()(const Output_section* sec1, const Output_section* sec2) |
| 1227 | { return sec1->address() < sec2->address(); } |
| 1228 | }; |
| 1229 | |
| 1230 | class Branch_info |
| 1231 | { |
| 1232 | public: |
| 1233 | Branch_info(Powerpc_relobj<size, big_endian>* ppc_object, |
| 1234 | unsigned int data_shndx, |
| 1235 | Address r_offset, |
| 1236 | unsigned int r_type, |
| 1237 | unsigned int r_sym, |
| 1238 | Address addend) |
| 1239 | : object_(ppc_object), shndx_(data_shndx), offset_(r_offset), |
| 1240 | r_type_(r_type), r_sym_(r_sym), addend_(addend) |
| 1241 | { } |
| 1242 | |
| 1243 | ~Branch_info() |
| 1244 | { } |
| 1245 | |
| 1246 | // If this branch needs a plt call stub, or a long branch stub, make one. |
| 1247 | bool |
| 1248 | make_stub(Stub_table<size, big_endian>*, |
| 1249 | Stub_table<size, big_endian>*, |
| 1250 | Symbol_table*) const; |
| 1251 | |
| 1252 | private: |
| 1253 | // The branch location.. |
| 1254 | Powerpc_relobj<size, big_endian>* object_; |
| 1255 | unsigned int shndx_; |
| 1256 | Address offset_; |
| 1257 | // ..and the branch type and destination. |
| 1258 | unsigned int r_type_; |
| 1259 | unsigned int r_sym_; |
| 1260 | Address addend_; |
| 1261 | }; |
| 1262 | |
| 1263 | // Information about this specific target which we pass to the |
| 1264 | // general Target structure. |
| 1265 | static Target::Target_info powerpc_info; |
| 1266 | |
| 1267 | // The types of GOT entries needed for this platform. |
| 1268 | // These values are exposed to the ABI in an incremental link. |
| 1269 | // Do not renumber existing values without changing the version |
| 1270 | // number of the .gnu_incremental_inputs section. |
| 1271 | enum Got_type |
| 1272 | { |
| 1273 | GOT_TYPE_STANDARD, |
| 1274 | GOT_TYPE_TLSGD, // double entry for @got@tlsgd |
| 1275 | GOT_TYPE_DTPREL, // entry for @got@dtprel |
| 1276 | GOT_TYPE_TPREL // entry for @got@tprel |
| 1277 | }; |
| 1278 | |
| 1279 | // The GOT section. |
| 1280 | Output_data_got_powerpc<size, big_endian>* got_; |
| 1281 | // The PLT section. This is a container for a table of addresses, |
| 1282 | // and their relocations. Each address in the PLT has a dynamic |
| 1283 | // relocation (R_*_JMP_SLOT) and each address will have a |
| 1284 | // corresponding entry in .glink for lazy resolution of the PLT. |
| 1285 | // ppc32 initialises the PLT to point at the .glink entry, while |
| 1286 | // ppc64 leaves this to ld.so. To make a call via the PLT, the |
| 1287 | // linker adds a stub that loads the PLT entry into ctr then |
| 1288 | // branches to ctr. There may be more than one stub for each PLT |
| 1289 | // entry. DT_JMPREL points at the first PLT dynamic relocation and |
| 1290 | // DT_PLTRELSZ gives the total size of PLT dynamic relocations. |
| 1291 | Output_data_plt_powerpc<size, big_endian>* plt_; |
| 1292 | // The IPLT section. Like plt_, this is a container for a table of |
| 1293 | // addresses and their relocations, specifically for STT_GNU_IFUNC |
| 1294 | // functions that resolve locally (STT_GNU_IFUNC functions that |
| 1295 | // don't resolve locally go in PLT). Unlike plt_, these have no |
| 1296 | // entry in .glink for lazy resolution, and the relocation section |
| 1297 | // does not have a 1-1 correspondence with IPLT addresses. In fact, |
| 1298 | // the relocation section may contain relocations against |
| 1299 | // STT_GNU_IFUNC symbols at locations outside of IPLT. The |
| 1300 | // relocation section will appear at the end of other dynamic |
| 1301 | // relocations, so that ld.so applies these relocations after other |
| 1302 | // dynamic relocations. In a static executable, the relocation |
| 1303 | // section is emitted and marked with __rela_iplt_start and |
| 1304 | // __rela_iplt_end symbols. |
| 1305 | Output_data_plt_powerpc<size, big_endian>* iplt_; |
| 1306 | // Section holding long branch destinations. |
| 1307 | Output_data_brlt_powerpc<size, big_endian>* brlt_section_; |
| 1308 | // The .glink section. |
| 1309 | Output_data_glink<size, big_endian>* glink_; |
| 1310 | // The dynamic reloc section. |
| 1311 | Reloc_section* rela_dyn_; |
| 1312 | // Relocs saved to avoid a COPY reloc. |
| 1313 | Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; |
| 1314 | // Offset of the GOT entry for local dynamic __tls_get_addr calls. |
| 1315 | unsigned int tlsld_got_offset_; |
| 1316 | |
| 1317 | Stub_tables stub_tables_; |
| 1318 | typedef Unordered_map<Address, unsigned int> Branch_lookup_table; |
| 1319 | Branch_lookup_table branch_lookup_table_; |
| 1320 | |
| 1321 | typedef std::vector<Branch_info> Branches; |
| 1322 | Branches branch_info_; |
| 1323 | |
| 1324 | bool plt_thread_safe_; |
| 1325 | |
| 1326 | bool relax_failed_; |
| 1327 | int relax_fail_count_; |
| 1328 | int32_t stub_group_size_; |
| 1329 | |
| 1330 | Output_data_save_res<size, big_endian> *savres_section_; |
| 1331 | }; |
| 1332 | |
| 1333 | template<> |
| 1334 | Target::Target_info Target_powerpc<32, true>::powerpc_info = |
| 1335 | { |
| 1336 | 32, // size |
| 1337 | true, // is_big_endian |
| 1338 | elfcpp::EM_PPC, // machine_code |
| 1339 | false, // has_make_symbol |
| 1340 | false, // has_resolve |
| 1341 | false, // has_code_fill |
| 1342 | true, // is_default_stack_executable |
| 1343 | false, // can_icf_inline_merge_sections |
| 1344 | '\0', // wrap_char |
| 1345 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1346 | 0x10000000, // default_text_segment_address |
| 1347 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1348 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1349 | false, // isolate_execinstr |
| 1350 | 0, // rosegment_gap |
| 1351 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1352 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1353 | 0, // small_common_section_flags |
| 1354 | 0, // large_common_section_flags |
| 1355 | NULL, // attributes_section |
| 1356 | NULL, // attributes_vendor |
| 1357 | "_start", // entry_symbol_name |
| 1358 | 32, // hash_entry_size |
| 1359 | }; |
| 1360 | |
| 1361 | template<> |
| 1362 | Target::Target_info Target_powerpc<32, false>::powerpc_info = |
| 1363 | { |
| 1364 | 32, // size |
| 1365 | false, // is_big_endian |
| 1366 | elfcpp::EM_PPC, // machine_code |
| 1367 | false, // has_make_symbol |
| 1368 | false, // has_resolve |
| 1369 | false, // has_code_fill |
| 1370 | true, // is_default_stack_executable |
| 1371 | false, // can_icf_inline_merge_sections |
| 1372 | '\0', // wrap_char |
| 1373 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1374 | 0x10000000, // default_text_segment_address |
| 1375 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1376 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1377 | false, // isolate_execinstr |
| 1378 | 0, // rosegment_gap |
| 1379 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1380 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1381 | 0, // small_common_section_flags |
| 1382 | 0, // large_common_section_flags |
| 1383 | NULL, // attributes_section |
| 1384 | NULL, // attributes_vendor |
| 1385 | "_start", // entry_symbol_name |
| 1386 | 32, // hash_entry_size |
| 1387 | }; |
| 1388 | |
| 1389 | template<> |
| 1390 | Target::Target_info Target_powerpc<64, true>::powerpc_info = |
| 1391 | { |
| 1392 | 64, // size |
| 1393 | true, // is_big_endian |
| 1394 | elfcpp::EM_PPC64, // machine_code |
| 1395 | false, // has_make_symbol |
| 1396 | false, // has_resolve |
| 1397 | false, // has_code_fill |
| 1398 | true, // is_default_stack_executable |
| 1399 | false, // can_icf_inline_merge_sections |
| 1400 | '\0', // wrap_char |
| 1401 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1402 | 0x10000000, // default_text_segment_address |
| 1403 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1404 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1405 | false, // isolate_execinstr |
| 1406 | 0, // rosegment_gap |
| 1407 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1408 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1409 | 0, // small_common_section_flags |
| 1410 | 0, // large_common_section_flags |
| 1411 | NULL, // attributes_section |
| 1412 | NULL, // attributes_vendor |
| 1413 | "_start", // entry_symbol_name |
| 1414 | 32, // hash_entry_size |
| 1415 | }; |
| 1416 | |
| 1417 | template<> |
| 1418 | Target::Target_info Target_powerpc<64, false>::powerpc_info = |
| 1419 | { |
| 1420 | 64, // size |
| 1421 | false, // is_big_endian |
| 1422 | elfcpp::EM_PPC64, // machine_code |
| 1423 | false, // has_make_symbol |
| 1424 | false, // has_resolve |
| 1425 | false, // has_code_fill |
| 1426 | true, // is_default_stack_executable |
| 1427 | false, // can_icf_inline_merge_sections |
| 1428 | '\0', // wrap_char |
| 1429 | "/usr/lib/ld.so.1", // dynamic_linker |
| 1430 | 0x10000000, // default_text_segment_address |
| 1431 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 1432 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 1433 | false, // isolate_execinstr |
| 1434 | 0, // rosegment_gap |
| 1435 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 1436 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 1437 | 0, // small_common_section_flags |
| 1438 | 0, // large_common_section_flags |
| 1439 | NULL, // attributes_section |
| 1440 | NULL, // attributes_vendor |
| 1441 | "_start", // entry_symbol_name |
| 1442 | 32, // hash_entry_size |
| 1443 | }; |
| 1444 | |
| 1445 | inline bool |
| 1446 | is_branch_reloc(unsigned int r_type) |
| 1447 | { |
| 1448 | return (r_type == elfcpp::R_POWERPC_REL24 |
| 1449 | || r_type == elfcpp::R_PPC_PLTREL24 |
| 1450 | || r_type == elfcpp::R_PPC_LOCAL24PC |
| 1451 | || r_type == elfcpp::R_POWERPC_REL14 |
| 1452 | || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN |
| 1453 | || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN |
| 1454 | || r_type == elfcpp::R_POWERPC_ADDR24 |
| 1455 | || r_type == elfcpp::R_POWERPC_ADDR14 |
| 1456 | || r_type == elfcpp::R_POWERPC_ADDR14_BRTAKEN |
| 1457 | || r_type == elfcpp::R_POWERPC_ADDR14_BRNTAKEN); |
| 1458 | } |
| 1459 | |
| 1460 | // If INSN is an opcode that may be used with an @tls operand, return |
| 1461 | // the transformed insn for TLS optimisation, otherwise return 0. If |
| 1462 | // REG is non-zero only match an insn with RB or RA equal to REG. |
| 1463 | uint32_t |
| 1464 | at_tls_transform(uint32_t insn, unsigned int reg) |
| 1465 | { |
| 1466 | if ((insn & (0x3f << 26)) != 31 << 26) |
| 1467 | return 0; |
| 1468 | |
| 1469 | unsigned int rtra; |
| 1470 | if (reg == 0 || ((insn >> 11) & 0x1f) == reg) |
| 1471 | rtra = insn & ((1 << 26) - (1 << 16)); |
| 1472 | else if (((insn >> 16) & 0x1f) == reg) |
| 1473 | rtra = (insn & (0x1f << 21)) | ((insn & (0x1f << 11)) << 5); |
| 1474 | else |
| 1475 | return 0; |
| 1476 | |
| 1477 | if ((insn & (0x3ff << 1)) == 266 << 1) |
| 1478 | // add -> addi |
| 1479 | insn = 14 << 26; |
| 1480 | else if ((insn & (0x1f << 1)) == 23 << 1 |
| 1481 | && ((insn & (0x1f << 6)) < 14 << 6 |
| 1482 | || ((insn & (0x1f << 6)) >= 16 << 6 |
| 1483 | && (insn & (0x1f << 6)) < 24 << 6))) |
| 1484 | // load and store indexed -> dform |
| 1485 | insn = (32 | ((insn >> 6) & 0x1f)) << 26; |
| 1486 | else if ((insn & (((0x1a << 5) | 0x1f) << 1)) == 21 << 1) |
| 1487 | // ldx, ldux, stdx, stdux -> ld, ldu, std, stdu |
| 1488 | insn = ((58 | ((insn >> 6) & 4)) << 26) | ((insn >> 6) & 1); |
| 1489 | else if ((insn & (((0x1f << 5) | 0x1f) << 1)) == 341 << 1) |
| 1490 | // lwax -> lwa |
| 1491 | insn = (58 << 26) | 2; |
| 1492 | else |
| 1493 | return 0; |
| 1494 | insn |= rtra; |
| 1495 | return insn; |
| 1496 | } |
| 1497 | |
| 1498 | |
| 1499 | template<int size, bool big_endian> |
| 1500 | class Powerpc_relocate_functions |
| 1501 | { |
| 1502 | public: |
| 1503 | enum Overflow_check |
| 1504 | { |
| 1505 | CHECK_NONE, |
| 1506 | CHECK_SIGNED, |
| 1507 | CHECK_UNSIGNED, |
| 1508 | CHECK_BITFIELD, |
| 1509 | CHECK_LOW_INSN, |
| 1510 | CHECK_HIGH_INSN |
| 1511 | }; |
| 1512 | |
| 1513 | enum Status |
| 1514 | { |
| 1515 | STATUS_OK, |
| 1516 | STATUS_OVERFLOW |
| 1517 | }; |
| 1518 | |
| 1519 | private: |
| 1520 | typedef Powerpc_relocate_functions<size, big_endian> This; |
| 1521 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 1522 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedAddress; |
| 1523 | |
| 1524 | template<int valsize> |
| 1525 | static inline bool |
| 1526 | has_overflow_signed(Address value) |
| 1527 | { |
| 1528 | // limit = 1 << (valsize - 1) without shift count exceeding size of type |
| 1529 | Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| 1530 | limit <<= ((valsize - 1) >> 1); |
| 1531 | limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| 1532 | return value + limit > (limit << 1) - 1; |
| 1533 | } |
| 1534 | |
| 1535 | template<int valsize> |
| 1536 | static inline bool |
| 1537 | has_overflow_unsigned(Address value) |
| 1538 | { |
| 1539 | Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| 1540 | limit <<= ((valsize - 1) >> 1); |
| 1541 | limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| 1542 | return value > (limit << 1) - 1; |
| 1543 | } |
| 1544 | |
| 1545 | template<int valsize> |
| 1546 | static inline bool |
| 1547 | has_overflow_bitfield(Address value) |
| 1548 | { |
| 1549 | return (has_overflow_unsigned<valsize>(value) |
| 1550 | && has_overflow_signed<valsize>(value)); |
| 1551 | } |
| 1552 | |
| 1553 | template<int valsize> |
| 1554 | static inline Status |
| 1555 | overflowed(Address value, Overflow_check overflow) |
| 1556 | { |
| 1557 | if (overflow == CHECK_SIGNED) |
| 1558 | { |
| 1559 | if (has_overflow_signed<valsize>(value)) |
| 1560 | return STATUS_OVERFLOW; |
| 1561 | } |
| 1562 | else if (overflow == CHECK_UNSIGNED) |
| 1563 | { |
| 1564 | if (has_overflow_unsigned<valsize>(value)) |
| 1565 | return STATUS_OVERFLOW; |
| 1566 | } |
| 1567 | else if (overflow == CHECK_BITFIELD) |
| 1568 | { |
| 1569 | if (has_overflow_bitfield<valsize>(value)) |
| 1570 | return STATUS_OVERFLOW; |
| 1571 | } |
| 1572 | return STATUS_OK; |
| 1573 | } |
| 1574 | |
| 1575 | // Do a simple RELA relocation |
| 1576 | template<int fieldsize, int valsize> |
| 1577 | static inline Status |
| 1578 | rela(unsigned char* view, Address value, Overflow_check overflow) |
| 1579 | { |
| 1580 | typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype; |
| 1581 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 1582 | elfcpp::Swap<fieldsize, big_endian>::writeval(wv, value); |
| 1583 | return overflowed<valsize>(value, overflow); |
| 1584 | } |
| 1585 | |
| 1586 | template<int fieldsize, int valsize> |
| 1587 | static inline Status |
| 1588 | rela(unsigned char* view, |
| 1589 | unsigned int right_shift, |
| 1590 | typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask, |
| 1591 | Address value, |
| 1592 | Overflow_check overflow) |
| 1593 | { |
| 1594 | typedef typename elfcpp::Swap<fieldsize, big_endian>::Valtype Valtype; |
| 1595 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 1596 | Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(wv); |
| 1597 | Valtype reloc = value >> right_shift; |
| 1598 | val &= ~dst_mask; |
| 1599 | reloc &= dst_mask; |
| 1600 | elfcpp::Swap<fieldsize, big_endian>::writeval(wv, val | reloc); |
| 1601 | return overflowed<valsize>(value >> right_shift, overflow); |
| 1602 | } |
| 1603 | |
| 1604 | // Do a simple RELA relocation, unaligned. |
| 1605 | template<int fieldsize, int valsize> |
| 1606 | static inline Status |
| 1607 | rela_ua(unsigned char* view, Address value, Overflow_check overflow) |
| 1608 | { |
| 1609 | elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, value); |
| 1610 | return overflowed<valsize>(value, overflow); |
| 1611 | } |
| 1612 | |
| 1613 | template<int fieldsize, int valsize> |
| 1614 | static inline Status |
| 1615 | rela_ua(unsigned char* view, |
| 1616 | unsigned int right_shift, |
| 1617 | typename elfcpp::Valtype_base<fieldsize>::Valtype dst_mask, |
| 1618 | Address value, |
| 1619 | Overflow_check overflow) |
| 1620 | { |
| 1621 | typedef typename elfcpp::Swap_unaligned<fieldsize, big_endian>::Valtype |
| 1622 | Valtype; |
| 1623 | Valtype val = elfcpp::Swap<fieldsize, big_endian>::readval(view); |
| 1624 | Valtype reloc = value >> right_shift; |
| 1625 | val &= ~dst_mask; |
| 1626 | reloc &= dst_mask; |
| 1627 | elfcpp::Swap_unaligned<fieldsize, big_endian>::writeval(view, val | reloc); |
| 1628 | return overflowed<valsize>(value >> right_shift, overflow); |
| 1629 | } |
| 1630 | |
| 1631 | public: |
| 1632 | // R_PPC64_ADDR64: (Symbol + Addend) |
| 1633 | static inline void |
| 1634 | addr64(unsigned char* view, Address value) |
| 1635 | { This::template rela<64,64>(view, value, CHECK_NONE); } |
| 1636 | |
| 1637 | // R_PPC64_UADDR64: (Symbol + Addend) unaligned |
| 1638 | static inline void |
| 1639 | addr64_u(unsigned char* view, Address value) |
| 1640 | { This::template rela_ua<64,64>(view, value, CHECK_NONE); } |
| 1641 | |
| 1642 | // R_POWERPC_ADDR32: (Symbol + Addend) |
| 1643 | static inline Status |
| 1644 | addr32(unsigned char* view, Address value, Overflow_check overflow) |
| 1645 | { return This::template rela<32,32>(view, value, overflow); } |
| 1646 | |
| 1647 | // R_POWERPC_UADDR32: (Symbol + Addend) unaligned |
| 1648 | static inline Status |
| 1649 | addr32_u(unsigned char* view, Address value, Overflow_check overflow) |
| 1650 | { return This::template rela_ua<32,32>(view, value, overflow); } |
| 1651 | |
| 1652 | // R_POWERPC_ADDR24: (Symbol + Addend) & 0x3fffffc |
| 1653 | static inline Status |
| 1654 | addr24(unsigned char* view, Address value, Overflow_check overflow) |
| 1655 | { |
| 1656 | Status stat = This::template rela<32,26>(view, 0, 0x03fffffc, |
| 1657 | value, overflow); |
| 1658 | if (overflow != CHECK_NONE && (value & 3) != 0) |
| 1659 | stat = STATUS_OVERFLOW; |
| 1660 | return stat; |
| 1661 | } |
| 1662 | |
| 1663 | // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff |
| 1664 | static inline Status |
| 1665 | addr16(unsigned char* view, Address value, Overflow_check overflow) |
| 1666 | { return This::template rela<16,16>(view, value, overflow); } |
| 1667 | |
| 1668 | // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff, unaligned |
| 1669 | static inline Status |
| 1670 | addr16_u(unsigned char* view, Address value, Overflow_check overflow) |
| 1671 | { return This::template rela_ua<16,16>(view, value, overflow); } |
| 1672 | |
| 1673 | // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc |
| 1674 | static inline Status |
| 1675 | addr16_ds(unsigned char* view, Address value, Overflow_check overflow) |
| 1676 | { |
| 1677 | Status stat = This::template rela<16,16>(view, 0, 0xfffc, value, overflow); |
| 1678 | if ((value & 3) != 0) |
| 1679 | stat = STATUS_OVERFLOW; |
| 1680 | return stat; |
| 1681 | } |
| 1682 | |
| 1683 | // R_POWERPC_ADDR16_DQ: (Symbol + Addend) & 0xfff0 |
| 1684 | static inline Status |
| 1685 | addr16_dq(unsigned char* view, Address value, Overflow_check overflow) |
| 1686 | { |
| 1687 | Status stat = This::template rela<16,16>(view, 0, 0xfff0, value, overflow); |
| 1688 | if ((value & 15) != 0) |
| 1689 | stat = STATUS_OVERFLOW; |
| 1690 | return stat; |
| 1691 | } |
| 1692 | |
| 1693 | // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff |
| 1694 | static inline void |
| 1695 | addr16_hi(unsigned char* view, Address value) |
| 1696 | { This::template rela<16,16>(view, 16, 0xffff, value, CHECK_NONE); } |
| 1697 | |
| 1698 | // R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff |
| 1699 | static inline void |
| 1700 | addr16_ha(unsigned char* view, Address value) |
| 1701 | { This::addr16_hi(view, value + 0x8000); } |
| 1702 | |
| 1703 | // R_POWERPC_ADDR16_HIGHER: ((Symbol + Addend) >> 32) & 0xffff |
| 1704 | static inline void |
| 1705 | addr16_hi2(unsigned char* view, Address value) |
| 1706 | { This::template rela<16,16>(view, 32, 0xffff, value, CHECK_NONE); } |
| 1707 | |
| 1708 | // R_POWERPC_ADDR16_HIGHERA: ((Symbol + Addend + 0x8000) >> 32) & 0xffff |
| 1709 | static inline void |
| 1710 | addr16_ha2(unsigned char* view, Address value) |
| 1711 | { This::addr16_hi2(view, value + 0x8000); } |
| 1712 | |
| 1713 | // R_POWERPC_ADDR16_HIGHEST: ((Symbol + Addend) >> 48) & 0xffff |
| 1714 | static inline void |
| 1715 | addr16_hi3(unsigned char* view, Address value) |
| 1716 | { This::template rela<16,16>(view, 48, 0xffff, value, CHECK_NONE); } |
| 1717 | |
| 1718 | // R_POWERPC_ADDR16_HIGHESTA: ((Symbol + Addend + 0x8000) >> 48) & 0xffff |
| 1719 | static inline void |
| 1720 | addr16_ha3(unsigned char* view, Address value) |
| 1721 | { This::addr16_hi3(view, value + 0x8000); } |
| 1722 | |
| 1723 | // R_POWERPC_ADDR14: (Symbol + Addend) & 0xfffc |
| 1724 | static inline Status |
| 1725 | addr14(unsigned char* view, Address value, Overflow_check overflow) |
| 1726 | { |
| 1727 | Status stat = This::template rela<32,16>(view, 0, 0xfffc, value, overflow); |
| 1728 | if (overflow != CHECK_NONE && (value & 3) != 0) |
| 1729 | stat = STATUS_OVERFLOW; |
| 1730 | return stat; |
| 1731 | } |
| 1732 | |
| 1733 | // R_POWERPC_REL16DX_HA |
| 1734 | static inline Status |
| 1735 | addr16dx_ha(unsigned char *view, Address value, Overflow_check overflow) |
| 1736 | { |
| 1737 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| 1738 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 1739 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 1740 | value += 0x8000; |
| 1741 | value = static_cast<SignedAddress>(value) >> 16; |
| 1742 | val |= (value & 0xffc1) | ((value & 0x3e) << 15); |
| 1743 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 1744 | return overflowed<16>(value, overflow); |
| 1745 | } |
| 1746 | }; |
| 1747 | |
| 1748 | // Set ABI version for input and output. |
| 1749 | |
| 1750 | template<int size, bool big_endian> |
| 1751 | void |
| 1752 | Powerpc_relobj<size, big_endian>::set_abiversion(int ver) |
| 1753 | { |
| 1754 | this->e_flags_ |= ver; |
| 1755 | if (this->abiversion() != 0) |
| 1756 | { |
| 1757 | Target_powerpc<size, big_endian>* target = |
| 1758 | static_cast<Target_powerpc<size, big_endian>*>( |
| 1759 | parameters->sized_target<size, big_endian>()); |
| 1760 | if (target->abiversion() == 0) |
| 1761 | target->set_abiversion(this->abiversion()); |
| 1762 | else if (target->abiversion() != this->abiversion()) |
| 1763 | gold_error(_("%s: ABI version %d is not compatible " |
| 1764 | "with ABI version %d output"), |
| 1765 | this->name().c_str(), |
| 1766 | this->abiversion(), target->abiversion()); |
| 1767 | |
| 1768 | } |
| 1769 | } |
| 1770 | |
| 1771 | // Stash away the index of .got2 or .opd in a relocatable object, if |
| 1772 | // such a section exists. |
| 1773 | |
| 1774 | template<int size, bool big_endian> |
| 1775 | bool |
| 1776 | Powerpc_relobj<size, big_endian>::do_find_special_sections( |
| 1777 | Read_symbols_data* sd) |
| 1778 | { |
| 1779 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 1780 | const unsigned char* namesu = sd->section_names->data(); |
| 1781 | const char* names = reinterpret_cast<const char*>(namesu); |
| 1782 | section_size_type names_size = sd->section_names_size; |
| 1783 | const unsigned char* s; |
| 1784 | |
| 1785 | s = this->template find_shdr<size, big_endian>(pshdrs, |
| 1786 | size == 32 ? ".got2" : ".opd", |
| 1787 | names, names_size, NULL); |
| 1788 | if (s != NULL) |
| 1789 | { |
| 1790 | unsigned int ndx = (s - pshdrs) / elfcpp::Elf_sizes<size>::shdr_size; |
| 1791 | this->special_ = ndx; |
| 1792 | if (size == 64) |
| 1793 | { |
| 1794 | if (this->abiversion() == 0) |
| 1795 | this->set_abiversion(1); |
| 1796 | else if (this->abiversion() > 1) |
| 1797 | gold_error(_("%s: .opd invalid in abiv%d"), |
| 1798 | this->name().c_str(), this->abiversion()); |
| 1799 | } |
| 1800 | } |
| 1801 | return Sized_relobj_file<size, big_endian>::do_find_special_sections(sd); |
| 1802 | } |
| 1803 | |
| 1804 | // Examine .rela.opd to build info about function entry points. |
| 1805 | |
| 1806 | template<int size, bool big_endian> |
| 1807 | void |
| 1808 | Powerpc_relobj<size, big_endian>::scan_opd_relocs( |
| 1809 | size_t reloc_count, |
| 1810 | const unsigned char* prelocs, |
| 1811 | const unsigned char* plocal_syms) |
| 1812 | { |
| 1813 | if (size == 64) |
| 1814 | { |
| 1815 | typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc |
| 1816 | Reltype; |
| 1817 | const int reloc_size |
| 1818 | = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| 1819 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 1820 | Address expected_off = 0; |
| 1821 | bool regular = true; |
| 1822 | unsigned int opd_ent_size = 0; |
| 1823 | |
| 1824 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| 1825 | { |
| 1826 | Reltype reloc(prelocs); |
| 1827 | typename elfcpp::Elf_types<size>::Elf_WXword r_info |
| 1828 | = reloc.get_r_info(); |
| 1829 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 1830 | if (r_type == elfcpp::R_PPC64_ADDR64) |
| 1831 | { |
| 1832 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 1833 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
| 1834 | bool is_ordinary; |
| 1835 | unsigned int shndx; |
| 1836 | if (r_sym < this->local_symbol_count()) |
| 1837 | { |
| 1838 | typename elfcpp::Sym<size, big_endian> |
| 1839 | lsym(plocal_syms + r_sym * sym_size); |
| 1840 | shndx = lsym.get_st_shndx(); |
| 1841 | shndx = this->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| 1842 | value = lsym.get_st_value(); |
| 1843 | } |
| 1844 | else |
| 1845 | shndx = this->symbol_section_and_value(r_sym, &value, |
| 1846 | &is_ordinary); |
| 1847 | this->set_opd_ent(reloc.get_r_offset(), shndx, |
| 1848 | value + reloc.get_r_addend()); |
| 1849 | if (i == 2) |
| 1850 | { |
| 1851 | expected_off = reloc.get_r_offset(); |
| 1852 | opd_ent_size = expected_off; |
| 1853 | } |
| 1854 | else if (expected_off != reloc.get_r_offset()) |
| 1855 | regular = false; |
| 1856 | expected_off += opd_ent_size; |
| 1857 | } |
| 1858 | else if (r_type == elfcpp::R_PPC64_TOC) |
| 1859 | { |
| 1860 | if (expected_off - opd_ent_size + 8 != reloc.get_r_offset()) |
| 1861 | regular = false; |
| 1862 | } |
| 1863 | else |
| 1864 | { |
| 1865 | gold_warning(_("%s: unexpected reloc type %u in .opd section"), |
| 1866 | this->name().c_str(), r_type); |
| 1867 | regular = false; |
| 1868 | } |
| 1869 | } |
| 1870 | if (reloc_count <= 2) |
| 1871 | opd_ent_size = this->section_size(this->opd_shndx()); |
| 1872 | if (opd_ent_size != 24 && opd_ent_size != 16) |
| 1873 | regular = false; |
| 1874 | if (!regular) |
| 1875 | { |
| 1876 | gold_warning(_("%s: .opd is not a regular array of opd entries"), |
| 1877 | this->name().c_str()); |
| 1878 | opd_ent_size = 0; |
| 1879 | } |
| 1880 | } |
| 1881 | } |
| 1882 | |
| 1883 | template<int size, bool big_endian> |
| 1884 | void |
| 1885 | Powerpc_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd) |
| 1886 | { |
| 1887 | Sized_relobj_file<size, big_endian>::do_read_relocs(rd); |
| 1888 | if (size == 64) |
| 1889 | { |
| 1890 | for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); |
| 1891 | p != rd->relocs.end(); |
| 1892 | ++p) |
| 1893 | { |
| 1894 | if (p->data_shndx == this->opd_shndx()) |
| 1895 | { |
| 1896 | uint64_t opd_size = this->section_size(this->opd_shndx()); |
| 1897 | gold_assert(opd_size == static_cast<size_t>(opd_size)); |
| 1898 | if (opd_size != 0) |
| 1899 | { |
| 1900 | this->init_opd(opd_size); |
| 1901 | this->scan_opd_relocs(p->reloc_count, p->contents->data(), |
| 1902 | rd->local_symbols->data()); |
| 1903 | } |
| 1904 | break; |
| 1905 | } |
| 1906 | } |
| 1907 | } |
| 1908 | } |
| 1909 | |
| 1910 | // Read the symbols then set up st_other vector. |
| 1911 | |
| 1912 | template<int size, bool big_endian> |
| 1913 | void |
| 1914 | Powerpc_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| 1915 | { |
| 1916 | this->base_read_symbols(sd); |
| 1917 | if (size == 64) |
| 1918 | { |
| 1919 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 1920 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 1921 | const unsigned int loccount = this->do_local_symbol_count(); |
| 1922 | if (loccount != 0) |
| 1923 | { |
| 1924 | this->st_other_.resize(loccount); |
| 1925 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 1926 | off_t locsize = loccount * sym_size; |
| 1927 | const unsigned int symtab_shndx = this->symtab_shndx(); |
| 1928 | const unsigned char *psymtab = pshdrs + symtab_shndx * shdr_size; |
| 1929 | typename elfcpp::Shdr<size, big_endian> shdr(psymtab); |
| 1930 | const unsigned char* psyms = this->get_view(shdr.get_sh_offset(), |
| 1931 | locsize, true, false); |
| 1932 | psyms += sym_size; |
| 1933 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| 1934 | { |
| 1935 | elfcpp::Sym<size, big_endian> sym(psyms); |
| 1936 | unsigned char st_other = sym.get_st_other(); |
| 1937 | this->st_other_[i] = st_other; |
| 1938 | if ((st_other & elfcpp::STO_PPC64_LOCAL_MASK) != 0) |
| 1939 | { |
| 1940 | if (this->abiversion() == 0) |
| 1941 | this->set_abiversion(2); |
| 1942 | else if (this->abiversion() < 2) |
| 1943 | gold_error(_("%s: local symbol %d has invalid st_other" |
| 1944 | " for ABI version 1"), |
| 1945 | this->name().c_str(), i); |
| 1946 | } |
| 1947 | } |
| 1948 | } |
| 1949 | } |
| 1950 | } |
| 1951 | |
| 1952 | template<int size, bool big_endian> |
| 1953 | void |
| 1954 | Powerpc_dynobj<size, big_endian>::set_abiversion(int ver) |
| 1955 | { |
| 1956 | this->e_flags_ |= ver; |
| 1957 | if (this->abiversion() != 0) |
| 1958 | { |
| 1959 | Target_powerpc<size, big_endian>* target = |
| 1960 | static_cast<Target_powerpc<size, big_endian>*>( |
| 1961 | parameters->sized_target<size, big_endian>()); |
| 1962 | if (target->abiversion() == 0) |
| 1963 | target->set_abiversion(this->abiversion()); |
| 1964 | else if (target->abiversion() != this->abiversion()) |
| 1965 | gold_error(_("%s: ABI version %d is not compatible " |
| 1966 | "with ABI version %d output"), |
| 1967 | this->name().c_str(), |
| 1968 | this->abiversion(), target->abiversion()); |
| 1969 | |
| 1970 | } |
| 1971 | } |
| 1972 | |
| 1973 | // Call Sized_dynobj::base_read_symbols to read the symbols then |
| 1974 | // read .opd from a dynamic object, filling in opd_ent_ vector, |
| 1975 | |
| 1976 | template<int size, bool big_endian> |
| 1977 | void |
| 1978 | Powerpc_dynobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| 1979 | { |
| 1980 | this->base_read_symbols(sd); |
| 1981 | if (size == 64) |
| 1982 | { |
| 1983 | const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 1984 | const unsigned char* const pshdrs = sd->section_headers->data(); |
| 1985 | const unsigned char* namesu = sd->section_names->data(); |
| 1986 | const char* names = reinterpret_cast<const char*>(namesu); |
| 1987 | const unsigned char* s = NULL; |
| 1988 | const unsigned char* opd; |
| 1989 | section_size_type opd_size; |
| 1990 | |
| 1991 | // Find and read .opd section. |
| 1992 | while (1) |
| 1993 | { |
| 1994 | s = this->template find_shdr<size, big_endian>(pshdrs, ".opd", names, |
| 1995 | sd->section_names_size, |
| 1996 | s); |
| 1997 | if (s == NULL) |
| 1998 | return; |
| 1999 | |
| 2000 | typename elfcpp::Shdr<size, big_endian> shdr(s); |
| 2001 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
| 2002 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0) |
| 2003 | { |
| 2004 | if (this->abiversion() == 0) |
| 2005 | this->set_abiversion(1); |
| 2006 | else if (this->abiversion() > 1) |
| 2007 | gold_error(_("%s: .opd invalid in abiv%d"), |
| 2008 | this->name().c_str(), this->abiversion()); |
| 2009 | |
| 2010 | this->opd_shndx_ = (s - pshdrs) / shdr_size; |
| 2011 | this->opd_address_ = shdr.get_sh_addr(); |
| 2012 | opd_size = convert_to_section_size_type(shdr.get_sh_size()); |
| 2013 | opd = this->get_view(shdr.get_sh_offset(), opd_size, |
| 2014 | true, false); |
| 2015 | break; |
| 2016 | } |
| 2017 | } |
| 2018 | |
| 2019 | // Build set of executable sections. |
| 2020 | // Using a set is probably overkill. There is likely to be only |
| 2021 | // a few executable sections, typically .init, .text and .fini, |
| 2022 | // and they are generally grouped together. |
| 2023 | typedef std::set<Sec_info> Exec_sections; |
| 2024 | Exec_sections exec_sections; |
| 2025 | s = pshdrs; |
| 2026 | for (unsigned int i = 1; i < this->shnum(); ++i, s += shdr_size) |
| 2027 | { |
| 2028 | typename elfcpp::Shdr<size, big_endian> shdr(s); |
| 2029 | if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS |
| 2030 | && ((shdr.get_sh_flags() |
| 2031 | & (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) |
| 2032 | == (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) |
| 2033 | && shdr.get_sh_size() != 0) |
| 2034 | { |
| 2035 | exec_sections.insert(Sec_info(shdr.get_sh_addr(), |
| 2036 | shdr.get_sh_size(), i)); |
| 2037 | } |
| 2038 | } |
| 2039 | if (exec_sections.empty()) |
| 2040 | return; |
| 2041 | |
| 2042 | // Look over the OPD entries. This is complicated by the fact |
| 2043 | // that some binaries will use two-word entries while others |
| 2044 | // will use the standard three-word entries. In most cases |
| 2045 | // the third word (the environment pointer for languages like |
| 2046 | // Pascal) is unused and will be zero. If the third word is |
| 2047 | // used it should not be pointing into executable sections, |
| 2048 | // I think. |
| 2049 | this->init_opd(opd_size); |
| 2050 | for (const unsigned char* p = opd; p < opd + opd_size; p += 8) |
| 2051 | { |
| 2052 | typedef typename elfcpp::Swap<64, big_endian>::Valtype Valtype; |
| 2053 | const Valtype* valp = reinterpret_cast<const Valtype*>(p); |
| 2054 | Valtype val = elfcpp::Swap<64, big_endian>::readval(valp); |
| 2055 | if (val == 0) |
| 2056 | // Chances are that this is the third word of an OPD entry. |
| 2057 | continue; |
| 2058 | typename Exec_sections::const_iterator e |
| 2059 | = exec_sections.upper_bound(Sec_info(val, 0, 0)); |
| 2060 | if (e != exec_sections.begin()) |
| 2061 | { |
| 2062 | --e; |
| 2063 | if (e->start <= val && val < e->start + e->len) |
| 2064 | { |
| 2065 | // We have an address in an executable section. |
| 2066 | // VAL ought to be the function entry, set it up. |
| 2067 | this->set_opd_ent(p - opd, e->shndx, val); |
| 2068 | // Skip second word of OPD entry, the TOC pointer. |
| 2069 | p += 8; |
| 2070 | } |
| 2071 | } |
| 2072 | // If we didn't match any executable sections, we likely |
| 2073 | // have a non-zero third word in the OPD entry. |
| 2074 | } |
| 2075 | } |
| 2076 | } |
| 2077 | |
| 2078 | // Set up some symbols. |
| 2079 | |
| 2080 | template<int size, bool big_endian> |
| 2081 | void |
| 2082 | Target_powerpc<size, big_endian>::do_define_standard_symbols( |
| 2083 | Symbol_table* symtab, |
| 2084 | Layout* layout) |
| 2085 | { |
| 2086 | if (size == 32) |
| 2087 | { |
| 2088 | // Define _GLOBAL_OFFSET_TABLE_ to ensure it isn't seen as |
| 2089 | // undefined when scanning relocs (and thus requires |
| 2090 | // non-relative dynamic relocs). The proper value will be |
| 2091 | // updated later. |
| 2092 | Symbol *gotsym = symtab->lookup("_GLOBAL_OFFSET_TABLE_", NULL); |
| 2093 | if (gotsym != NULL && gotsym->is_undefined()) |
| 2094 | { |
| 2095 | Target_powerpc<size, big_endian>* target = |
| 2096 | static_cast<Target_powerpc<size, big_endian>*>( |
| 2097 | parameters->sized_target<size, big_endian>()); |
| 2098 | Output_data_got_powerpc<size, big_endian>* got |
| 2099 | = target->got_section(symtab, layout); |
| 2100 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 2101 | Symbol_table::PREDEFINED, |
| 2102 | got, 0, 0, |
| 2103 | elfcpp::STT_OBJECT, |
| 2104 | elfcpp::STB_LOCAL, |
| 2105 | elfcpp::STV_HIDDEN, 0, |
| 2106 | false, false); |
| 2107 | } |
| 2108 | |
| 2109 | // Define _SDA_BASE_ at the start of the .sdata section + 32768. |
| 2110 | Symbol *sdasym = symtab->lookup("_SDA_BASE_", NULL); |
| 2111 | if (sdasym != NULL && sdasym->is_undefined()) |
| 2112 | { |
| 2113 | Output_data_space* sdata = new Output_data_space(4, "** sdata"); |
| 2114 | Output_section* os |
| 2115 | = layout->add_output_section_data(".sdata", 0, |
| 2116 | elfcpp::SHF_ALLOC |
| 2117 | | elfcpp::SHF_WRITE, |
| 2118 | sdata, ORDER_SMALL_DATA, false); |
| 2119 | symtab->define_in_output_data("_SDA_BASE_", NULL, |
| 2120 | Symbol_table::PREDEFINED, |
| 2121 | os, 32768, 0, elfcpp::STT_OBJECT, |
| 2122 | elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN, |
| 2123 | 0, false, false); |
| 2124 | } |
| 2125 | } |
| 2126 | else |
| 2127 | { |
| 2128 | // Define .TOC. as for 32-bit _GLOBAL_OFFSET_TABLE_ |
| 2129 | Symbol *gotsym = symtab->lookup(".TOC.", NULL); |
| 2130 | if (gotsym != NULL && gotsym->is_undefined()) |
| 2131 | { |
| 2132 | Target_powerpc<size, big_endian>* target = |
| 2133 | static_cast<Target_powerpc<size, big_endian>*>( |
| 2134 | parameters->sized_target<size, big_endian>()); |
| 2135 | Output_data_got_powerpc<size, big_endian>* got |
| 2136 | = target->got_section(symtab, layout); |
| 2137 | symtab->define_in_output_data(".TOC.", NULL, |
| 2138 | Symbol_table::PREDEFINED, |
| 2139 | got, 0x8000, 0, |
| 2140 | elfcpp::STT_OBJECT, |
| 2141 | elfcpp::STB_LOCAL, |
| 2142 | elfcpp::STV_HIDDEN, 0, |
| 2143 | false, false); |
| 2144 | } |
| 2145 | } |
| 2146 | } |
| 2147 | |
| 2148 | // Set up PowerPC target specific relobj. |
| 2149 | |
| 2150 | template<int size, bool big_endian> |
| 2151 | Object* |
| 2152 | Target_powerpc<size, big_endian>::do_make_elf_object( |
| 2153 | const std::string& name, |
| 2154 | Input_file* input_file, |
| 2155 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| 2156 | { |
| 2157 | int et = ehdr.get_e_type(); |
| 2158 | // ET_EXEC files are valid input for --just-symbols/-R, |
| 2159 | // and we treat them as relocatable objects. |
| 2160 | if (et == elfcpp::ET_REL |
| 2161 | || (et == elfcpp::ET_EXEC && input_file->just_symbols())) |
| 2162 | { |
| 2163 | Powerpc_relobj<size, big_endian>* obj = |
| 2164 | new Powerpc_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| 2165 | obj->setup(); |
| 2166 | return obj; |
| 2167 | } |
| 2168 | else if (et == elfcpp::ET_DYN) |
| 2169 | { |
| 2170 | Powerpc_dynobj<size, big_endian>* obj = |
| 2171 | new Powerpc_dynobj<size, big_endian>(name, input_file, offset, ehdr); |
| 2172 | obj->setup(); |
| 2173 | return obj; |
| 2174 | } |
| 2175 | else |
| 2176 | { |
| 2177 | gold_error(_("%s: unsupported ELF file type %d"), name.c_str(), et); |
| 2178 | return NULL; |
| 2179 | } |
| 2180 | } |
| 2181 | |
| 2182 | template<int size, bool big_endian> |
| 2183 | class Output_data_got_powerpc : public Output_data_got<size, big_endian> |
| 2184 | { |
| 2185 | public: |
| 2186 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; |
| 2187 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Rela_dyn; |
| 2188 | |
| 2189 | Output_data_got_powerpc(Symbol_table* symtab, Layout* layout) |
| 2190 | : Output_data_got<size, big_endian>(), |
| 2191 | symtab_(symtab), layout_(layout), |
| 2192 | header_ent_cnt_(size == 32 ? 3 : 1), |
| 2193 | header_index_(size == 32 ? 0x2000 : 0) |
| 2194 | { |
| 2195 | if (size == 64) |
| 2196 | this->set_addralign(256); |
| 2197 | } |
| 2198 | |
| 2199 | // Override all the Output_data_got methods we use so as to first call |
| 2200 | // reserve_ent(). |
| 2201 | bool |
| 2202 | add_global(Symbol* gsym, unsigned int got_type) |
| 2203 | { |
| 2204 | this->reserve_ent(); |
| 2205 | return Output_data_got<size, big_endian>::add_global(gsym, got_type); |
| 2206 | } |
| 2207 | |
| 2208 | bool |
| 2209 | add_global_plt(Symbol* gsym, unsigned int got_type) |
| 2210 | { |
| 2211 | this->reserve_ent(); |
| 2212 | return Output_data_got<size, big_endian>::add_global_plt(gsym, got_type); |
| 2213 | } |
| 2214 | |
| 2215 | bool |
| 2216 | add_global_tls(Symbol* gsym, unsigned int got_type) |
| 2217 | { return this->add_global_plt(gsym, got_type); } |
| 2218 | |
| 2219 | void |
| 2220 | add_global_with_rel(Symbol* gsym, unsigned int got_type, |
| 2221 | Output_data_reloc_generic* rel_dyn, unsigned int r_type) |
| 2222 | { |
| 2223 | this->reserve_ent(); |
| 2224 | Output_data_got<size, big_endian>:: |
| 2225 | add_global_with_rel(gsym, got_type, rel_dyn, r_type); |
| 2226 | } |
| 2227 | |
| 2228 | void |
| 2229 | add_global_pair_with_rel(Symbol* gsym, unsigned int got_type, |
| 2230 | Output_data_reloc_generic* rel_dyn, |
| 2231 | unsigned int r_type_1, unsigned int r_type_2) |
| 2232 | { |
| 2233 | this->reserve_ent(2); |
| 2234 | Output_data_got<size, big_endian>:: |
| 2235 | add_global_pair_with_rel(gsym, got_type, rel_dyn, r_type_1, r_type_2); |
| 2236 | } |
| 2237 | |
| 2238 | bool |
| 2239 | add_local(Relobj* object, unsigned int sym_index, unsigned int got_type) |
| 2240 | { |
| 2241 | this->reserve_ent(); |
| 2242 | return Output_data_got<size, big_endian>::add_local(object, sym_index, |
| 2243 | got_type); |
| 2244 | } |
| 2245 | |
| 2246 | bool |
| 2247 | add_local_plt(Relobj* object, unsigned int sym_index, unsigned int got_type) |
| 2248 | { |
| 2249 | this->reserve_ent(); |
| 2250 | return Output_data_got<size, big_endian>::add_local_plt(object, sym_index, |
| 2251 | got_type); |
| 2252 | } |
| 2253 | |
| 2254 | bool |
| 2255 | add_local_tls(Relobj* object, unsigned int sym_index, unsigned int got_type) |
| 2256 | { return this->add_local_plt(object, sym_index, got_type); } |
| 2257 | |
| 2258 | void |
| 2259 | add_local_tls_pair(Relobj* object, unsigned int sym_index, |
| 2260 | unsigned int got_type, |
| 2261 | Output_data_reloc_generic* rel_dyn, |
| 2262 | unsigned int r_type) |
| 2263 | { |
| 2264 | this->reserve_ent(2); |
| 2265 | Output_data_got<size, big_endian>:: |
| 2266 | add_local_tls_pair(object, sym_index, got_type, rel_dyn, r_type); |
| 2267 | } |
| 2268 | |
| 2269 | unsigned int |
| 2270 | add_constant(Valtype constant) |
| 2271 | { |
| 2272 | this->reserve_ent(); |
| 2273 | return Output_data_got<size, big_endian>::add_constant(constant); |
| 2274 | } |
| 2275 | |
| 2276 | unsigned int |
| 2277 | add_constant_pair(Valtype c1, Valtype c2) |
| 2278 | { |
| 2279 | this->reserve_ent(2); |
| 2280 | return Output_data_got<size, big_endian>::add_constant_pair(c1, c2); |
| 2281 | } |
| 2282 | |
| 2283 | // Offset of _GLOBAL_OFFSET_TABLE_. |
| 2284 | unsigned int |
| 2285 | g_o_t() const |
| 2286 | { |
| 2287 | return this->got_offset(this->header_index_); |
| 2288 | } |
| 2289 | |
| 2290 | // Offset of base used to access the GOT/TOC. |
| 2291 | // The got/toc pointer reg will be set to this value. |
| 2292 | Valtype |
| 2293 | got_base_offset(const Powerpc_relobj<size, big_endian>* object) const |
| 2294 | { |
| 2295 | if (size == 32) |
| 2296 | return this->g_o_t(); |
| 2297 | else |
| 2298 | return (this->output_section()->address() |
| 2299 | + object->toc_base_offset() |
| 2300 | - this->address()); |
| 2301 | } |
| 2302 | |
| 2303 | // Ensure our GOT has a header. |
| 2304 | void |
| 2305 | set_final_data_size() |
| 2306 | { |
| 2307 | if (this->header_ent_cnt_ != 0) |
| 2308 | this->make_header(); |
| 2309 | Output_data_got<size, big_endian>::set_final_data_size(); |
| 2310 | } |
| 2311 | |
| 2312 | // First word of GOT header needs some values that are not |
| 2313 | // handled by Output_data_got so poke them in here. |
| 2314 | // For 32-bit, address of .dynamic, for 64-bit, address of TOCbase. |
| 2315 | void |
| 2316 | do_write(Output_file* of) |
| 2317 | { |
| 2318 | Valtype val = 0; |
| 2319 | if (size == 32 && this->layout_->dynamic_data() != NULL) |
| 2320 | val = this->layout_->dynamic_section()->address(); |
| 2321 | if (size == 64) |
| 2322 | val = this->output_section()->address() + 0x8000; |
| 2323 | this->replace_constant(this->header_index_, val); |
| 2324 | Output_data_got<size, big_endian>::do_write(of); |
| 2325 | } |
| 2326 | |
| 2327 | private: |
| 2328 | void |
| 2329 | reserve_ent(unsigned int cnt = 1) |
| 2330 | { |
| 2331 | if (this->header_ent_cnt_ == 0) |
| 2332 | return; |
| 2333 | if (this->num_entries() + cnt > this->header_index_) |
| 2334 | this->make_header(); |
| 2335 | } |
| 2336 | |
| 2337 | void |
| 2338 | make_header() |
| 2339 | { |
| 2340 | this->header_ent_cnt_ = 0; |
| 2341 | this->header_index_ = this->num_entries(); |
| 2342 | if (size == 32) |
| 2343 | { |
| 2344 | Output_data_got<size, big_endian>::add_constant(0); |
| 2345 | Output_data_got<size, big_endian>::add_constant(0); |
| 2346 | Output_data_got<size, big_endian>::add_constant(0); |
| 2347 | |
| 2348 | // Define _GLOBAL_OFFSET_TABLE_ at the header |
| 2349 | Symbol *gotsym = this->symtab_->lookup("_GLOBAL_OFFSET_TABLE_", NULL); |
| 2350 | if (gotsym != NULL) |
| 2351 | { |
| 2352 | Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(gotsym); |
| 2353 | sym->set_value(this->g_o_t()); |
| 2354 | } |
| 2355 | else |
| 2356 | this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 2357 | Symbol_table::PREDEFINED, |
| 2358 | this, this->g_o_t(), 0, |
| 2359 | elfcpp::STT_OBJECT, |
| 2360 | elfcpp::STB_LOCAL, |
| 2361 | elfcpp::STV_HIDDEN, 0, |
| 2362 | false, false); |
| 2363 | } |
| 2364 | else |
| 2365 | Output_data_got<size, big_endian>::add_constant(0); |
| 2366 | } |
| 2367 | |
| 2368 | // Stashed pointers. |
| 2369 | Symbol_table* symtab_; |
| 2370 | Layout* layout_; |
| 2371 | |
| 2372 | // GOT header size. |
| 2373 | unsigned int header_ent_cnt_; |
| 2374 | // GOT header index. |
| 2375 | unsigned int header_index_; |
| 2376 | }; |
| 2377 | |
| 2378 | // Get the GOT section, creating it if necessary. |
| 2379 | |
| 2380 | template<int size, bool big_endian> |
| 2381 | Output_data_got_powerpc<size, big_endian>* |
| 2382 | Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab, |
| 2383 | Layout* layout) |
| 2384 | { |
| 2385 | if (this->got_ == NULL) |
| 2386 | { |
| 2387 | gold_assert(symtab != NULL && layout != NULL); |
| 2388 | |
| 2389 | this->got_ |
| 2390 | = new Output_data_got_powerpc<size, big_endian>(symtab, layout); |
| 2391 | |
| 2392 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 2393 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 2394 | this->got_, ORDER_DATA, false); |
| 2395 | } |
| 2396 | |
| 2397 | return this->got_; |
| 2398 | } |
| 2399 | |
| 2400 | // Get the dynamic reloc section, creating it if necessary. |
| 2401 | |
| 2402 | template<int size, bool big_endian> |
| 2403 | typename Target_powerpc<size, big_endian>::Reloc_section* |
| 2404 | Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout) |
| 2405 | { |
| 2406 | if (this->rela_dyn_ == NULL) |
| 2407 | { |
| 2408 | gold_assert(layout != NULL); |
| 2409 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| 2410 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 2411 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
| 2412 | ORDER_DYNAMIC_RELOCS, false); |
| 2413 | } |
| 2414 | return this->rela_dyn_; |
| 2415 | } |
| 2416 | |
| 2417 | // Similarly, but for ifunc symbols get the one for ifunc. |
| 2418 | |
| 2419 | template<int size, bool big_endian> |
| 2420 | typename Target_powerpc<size, big_endian>::Reloc_section* |
| 2421 | Target_powerpc<size, big_endian>::rela_dyn_section(Symbol_table* symtab, |
| 2422 | Layout* layout, |
| 2423 | bool for_ifunc) |
| 2424 | { |
| 2425 | if (!for_ifunc) |
| 2426 | return this->rela_dyn_section(layout); |
| 2427 | |
| 2428 | if (this->iplt_ == NULL) |
| 2429 | this->make_iplt_section(symtab, layout); |
| 2430 | return this->iplt_->rel_plt(); |
| 2431 | } |
| 2432 | |
| 2433 | class Stub_control |
| 2434 | { |
| 2435 | public: |
| 2436 | // Determine the stub group size. The group size is the absolute |
| 2437 | // value of the parameter --stub-group-size. If --stub-group-size |
| 2438 | // is passed a negative value, we restrict stubs to be always before |
| 2439 | // the stubbed branches. |
| 2440 | Stub_control(int32_t size, bool no_size_errors) |
| 2441 | : state_(NO_GROUP), stub_group_size_(abs(size)), |
| 2442 | stub14_group_size_(abs(size) >> 10), |
| 2443 | stubs_always_before_branch_(size < 0), |
| 2444 | suppress_size_errors_(no_size_errors), |
| 2445 | group_end_addr_(0), owner_(NULL), output_section_(NULL) |
| 2446 | { |
| 2447 | } |
| 2448 | |
| 2449 | // Return true iff input section can be handled by current stub |
| 2450 | // group. |
| 2451 | bool |
| 2452 | can_add_to_stub_group(Output_section* o, |
| 2453 | const Output_section::Input_section* i, |
| 2454 | bool has14); |
| 2455 | |
| 2456 | const Output_section::Input_section* |
| 2457 | owner() |
| 2458 | { return owner_; } |
| 2459 | |
| 2460 | Output_section* |
| 2461 | output_section() |
| 2462 | { return output_section_; } |
| 2463 | |
| 2464 | void |
| 2465 | set_output_and_owner(Output_section* o, |
| 2466 | const Output_section::Input_section* i) |
| 2467 | { |
| 2468 | this->output_section_ = o; |
| 2469 | this->owner_ = i; |
| 2470 | } |
| 2471 | |
| 2472 | private: |
| 2473 | typedef enum |
| 2474 | { |
| 2475 | NO_GROUP, |
| 2476 | FINDING_STUB_SECTION, |
| 2477 | HAS_STUB_SECTION |
| 2478 | } State; |
| 2479 | |
| 2480 | State state_; |
| 2481 | uint32_t stub_group_size_; |
| 2482 | uint32_t stub14_group_size_; |
| 2483 | bool stubs_always_before_branch_; |
| 2484 | bool suppress_size_errors_; |
| 2485 | uint64_t group_end_addr_; |
| 2486 | const Output_section::Input_section* owner_; |
| 2487 | Output_section* output_section_; |
| 2488 | }; |
| 2489 | |
| 2490 | // Return true iff input section can be handled by current stub |
| 2491 | // group. |
| 2492 | |
| 2493 | bool |
| 2494 | Stub_control::can_add_to_stub_group(Output_section* o, |
| 2495 | const Output_section::Input_section* i, |
| 2496 | bool has14) |
| 2497 | { |
| 2498 | uint32_t group_size |
| 2499 | = has14 ? this->stub14_group_size_ : this->stub_group_size_; |
| 2500 | bool whole_sec = o->order() == ORDER_INIT || o->order() == ORDER_FINI; |
| 2501 | uint64_t this_size; |
| 2502 | uint64_t start_addr = o->address(); |
| 2503 | |
| 2504 | if (whole_sec) |
| 2505 | // .init and .fini sections are pasted together to form a single |
| 2506 | // function. We can't be adding stubs in the middle of the function. |
| 2507 | this_size = o->data_size(); |
| 2508 | else |
| 2509 | { |
| 2510 | start_addr += i->relobj()->output_section_offset(i->shndx()); |
| 2511 | this_size = i->data_size(); |
| 2512 | } |
| 2513 | uint64_t end_addr = start_addr + this_size; |
| 2514 | bool toobig = this_size > group_size; |
| 2515 | |
| 2516 | if (toobig && !this->suppress_size_errors_) |
| 2517 | gold_warning(_("%s:%s exceeds group size"), |
| 2518 | i->relobj()->name().c_str(), |
| 2519 | i->relobj()->section_name(i->shndx()).c_str()); |
| 2520 | |
| 2521 | if (this->state_ != HAS_STUB_SECTION |
| 2522 | && (!whole_sec || this->output_section_ != o) |
| 2523 | && (this->state_ == NO_GROUP |
| 2524 | || this->group_end_addr_ - end_addr < group_size)) |
| 2525 | { |
| 2526 | this->owner_ = i; |
| 2527 | this->output_section_ = o; |
| 2528 | } |
| 2529 | |
| 2530 | if (this->state_ == NO_GROUP) |
| 2531 | { |
| 2532 | this->state_ = FINDING_STUB_SECTION; |
| 2533 | this->group_end_addr_ = end_addr; |
| 2534 | } |
| 2535 | else if (this->group_end_addr_ - start_addr < group_size) |
| 2536 | ; |
| 2537 | // Adding this section would make the group larger than GROUP_SIZE. |
| 2538 | else if (this->state_ == FINDING_STUB_SECTION |
| 2539 | && !this->stubs_always_before_branch_ |
| 2540 | && !toobig) |
| 2541 | { |
| 2542 | // But wait, there's more! Input sections up to GROUP_SIZE |
| 2543 | // bytes before the stub table can be handled by it too. |
| 2544 | this->state_ = HAS_STUB_SECTION; |
| 2545 | this->group_end_addr_ = end_addr; |
| 2546 | } |
| 2547 | else |
| 2548 | { |
| 2549 | this->state_ = NO_GROUP; |
| 2550 | return false; |
| 2551 | } |
| 2552 | return true; |
| 2553 | } |
| 2554 | |
| 2555 | // Look over all the input sections, deciding where to place stubs. |
| 2556 | |
| 2557 | template<int size, bool big_endian> |
| 2558 | void |
| 2559 | Target_powerpc<size, big_endian>::group_sections(Layout* layout, |
| 2560 | const Task*, |
| 2561 | bool no_size_errors) |
| 2562 | { |
| 2563 | Stub_control stub_control(this->stub_group_size_, no_size_errors); |
| 2564 | |
| 2565 | // Group input sections and insert stub table |
| 2566 | Stub_table_owner* table_owner = NULL; |
| 2567 | std::vector<Stub_table_owner*> tables; |
| 2568 | Layout::Section_list section_list; |
| 2569 | layout->get_executable_sections(§ion_list); |
| 2570 | std::stable_sort(section_list.begin(), section_list.end(), Sort_sections()); |
| 2571 | for (Layout::Section_list::reverse_iterator o = section_list.rbegin(); |
| 2572 | o != section_list.rend(); |
| 2573 | ++o) |
| 2574 | { |
| 2575 | typedef Output_section::Input_section_list Input_section_list; |
| 2576 | for (Input_section_list::const_reverse_iterator i |
| 2577 | = (*o)->input_sections().rbegin(); |
| 2578 | i != (*o)->input_sections().rend(); |
| 2579 | ++i) |
| 2580 | { |
| 2581 | if (i->is_input_section() |
| 2582 | || i->is_relaxed_input_section()) |
| 2583 | { |
| 2584 | Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 2585 | <Powerpc_relobj<size, big_endian>*>(i->relobj()); |
| 2586 | bool has14 = ppcobj->has_14bit_branch(i->shndx()); |
| 2587 | if (!stub_control.can_add_to_stub_group(*o, &*i, has14)) |
| 2588 | { |
| 2589 | table_owner->output_section = stub_control.output_section(); |
| 2590 | table_owner->owner = stub_control.owner(); |
| 2591 | stub_control.set_output_and_owner(*o, &*i); |
| 2592 | table_owner = NULL; |
| 2593 | } |
| 2594 | if (table_owner == NULL) |
| 2595 | { |
| 2596 | table_owner = new Stub_table_owner; |
| 2597 | tables.push_back(table_owner); |
| 2598 | } |
| 2599 | ppcobj->set_stub_table(i->shndx(), tables.size() - 1); |
| 2600 | } |
| 2601 | } |
| 2602 | } |
| 2603 | if (table_owner != NULL) |
| 2604 | { |
| 2605 | const Output_section::Input_section* i = stub_control.owner(); |
| 2606 | |
| 2607 | if (tables.size() >= 2 && tables[tables.size() - 2]->owner == i) |
| 2608 | { |
| 2609 | // Corner case. A new stub group was made for the first |
| 2610 | // section (last one looked at here) for some reason, but |
| 2611 | // the first section is already being used as the owner for |
| 2612 | // a stub table for following sections. Force it into that |
| 2613 | // stub group. |
| 2614 | tables.pop_back(); |
| 2615 | delete table_owner; |
| 2616 | Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 2617 | <Powerpc_relobj<size, big_endian>*>(i->relobj()); |
| 2618 | ppcobj->set_stub_table(i->shndx(), tables.size() - 1); |
| 2619 | } |
| 2620 | else |
| 2621 | { |
| 2622 | table_owner->output_section = stub_control.output_section(); |
| 2623 | table_owner->owner = i; |
| 2624 | } |
| 2625 | } |
| 2626 | for (typename std::vector<Stub_table_owner*>::iterator t = tables.begin(); |
| 2627 | t != tables.end(); |
| 2628 | ++t) |
| 2629 | { |
| 2630 | Stub_table<size, big_endian>* stub_table; |
| 2631 | |
| 2632 | if ((*t)->owner->is_input_section()) |
| 2633 | stub_table = new Stub_table<size, big_endian>(this, |
| 2634 | (*t)->output_section, |
| 2635 | (*t)->owner); |
| 2636 | else if ((*t)->owner->is_relaxed_input_section()) |
| 2637 | stub_table = static_cast<Stub_table<size, big_endian>*>( |
| 2638 | (*t)->owner->relaxed_input_section()); |
| 2639 | else |
| 2640 | gold_unreachable(); |
| 2641 | this->stub_tables_.push_back(stub_table); |
| 2642 | delete *t; |
| 2643 | } |
| 2644 | } |
| 2645 | |
| 2646 | static unsigned long |
| 2647 | max_branch_delta (unsigned int r_type) |
| 2648 | { |
| 2649 | if (r_type == elfcpp::R_POWERPC_REL14 |
| 2650 | || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN |
| 2651 | || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN) |
| 2652 | return 1L << 15; |
| 2653 | if (r_type == elfcpp::R_POWERPC_REL24 |
| 2654 | || r_type == elfcpp::R_PPC_PLTREL24 |
| 2655 | || r_type == elfcpp::R_PPC_LOCAL24PC) |
| 2656 | return 1L << 25; |
| 2657 | return 0; |
| 2658 | } |
| 2659 | |
| 2660 | // If this branch needs a plt call stub, or a long branch stub, make one. |
| 2661 | |
| 2662 | template<int size, bool big_endian> |
| 2663 | bool |
| 2664 | Target_powerpc<size, big_endian>::Branch_info::make_stub( |
| 2665 | Stub_table<size, big_endian>* stub_table, |
| 2666 | Stub_table<size, big_endian>* ifunc_stub_table, |
| 2667 | Symbol_table* symtab) const |
| 2668 | { |
| 2669 | Symbol* sym = this->object_->global_symbol(this->r_sym_); |
| 2670 | if (sym != NULL && sym->is_forwarder()) |
| 2671 | sym = symtab->resolve_forwards(sym); |
| 2672 | const Sized_symbol<size>* gsym = static_cast<const Sized_symbol<size>*>(sym); |
| 2673 | Target_powerpc<size, big_endian>* target = |
| 2674 | static_cast<Target_powerpc<size, big_endian>*>( |
| 2675 | parameters->sized_target<size, big_endian>()); |
| 2676 | if (gsym != NULL |
| 2677 | ? gsym->use_plt_offset(Scan::get_reference_flags(this->r_type_, target)) |
| 2678 | : this->object_->local_has_plt_offset(this->r_sym_)) |
| 2679 | { |
| 2680 | if (size == 64 |
| 2681 | && gsym != NULL |
| 2682 | && target->abiversion() >= 2 |
| 2683 | && !parameters->options().output_is_position_independent() |
| 2684 | && !is_branch_reloc(this->r_type_)) |
| 2685 | target->glink_section()->add_global_entry(gsym); |
| 2686 | else |
| 2687 | { |
| 2688 | if (stub_table == NULL) |
| 2689 | stub_table = this->object_->stub_table(this->shndx_); |
| 2690 | if (stub_table == NULL) |
| 2691 | { |
| 2692 | // This is a ref from a data section to an ifunc symbol. |
| 2693 | stub_table = ifunc_stub_table; |
| 2694 | } |
| 2695 | gold_assert(stub_table != NULL); |
| 2696 | Address from = this->object_->get_output_section_offset(this->shndx_); |
| 2697 | if (from != invalid_address) |
| 2698 | from += (this->object_->output_section(this->shndx_)->address() |
| 2699 | + this->offset_); |
| 2700 | if (gsym != NULL) |
| 2701 | return stub_table->add_plt_call_entry(from, |
| 2702 | this->object_, gsym, |
| 2703 | this->r_type_, this->addend_); |
| 2704 | else |
| 2705 | return stub_table->add_plt_call_entry(from, |
| 2706 | this->object_, this->r_sym_, |
| 2707 | this->r_type_, this->addend_); |
| 2708 | } |
| 2709 | } |
| 2710 | else |
| 2711 | { |
| 2712 | Address max_branch_offset = max_branch_delta(this->r_type_); |
| 2713 | if (max_branch_offset == 0) |
| 2714 | return true; |
| 2715 | Address from = this->object_->get_output_section_offset(this->shndx_); |
| 2716 | gold_assert(from != invalid_address); |
| 2717 | from += (this->object_->output_section(this->shndx_)->address() |
| 2718 | + this->offset_); |
| 2719 | Address to; |
| 2720 | if (gsym != NULL) |
| 2721 | { |
| 2722 | switch (gsym->source()) |
| 2723 | { |
| 2724 | case Symbol::FROM_OBJECT: |
| 2725 | { |
| 2726 | Object* symobj = gsym->object(); |
| 2727 | if (symobj->is_dynamic() |
| 2728 | || symobj->pluginobj() != NULL) |
| 2729 | return true; |
| 2730 | bool is_ordinary; |
| 2731 | unsigned int shndx = gsym->shndx(&is_ordinary); |
| 2732 | if (shndx == elfcpp::SHN_UNDEF) |
| 2733 | return true; |
| 2734 | } |
| 2735 | break; |
| 2736 | |
| 2737 | case Symbol::IS_UNDEFINED: |
| 2738 | return true; |
| 2739 | |
| 2740 | default: |
| 2741 | break; |
| 2742 | } |
| 2743 | Symbol_table::Compute_final_value_status status; |
| 2744 | to = symtab->compute_final_value<size>(gsym, &status); |
| 2745 | if (status != Symbol_table::CFVS_OK) |
| 2746 | return true; |
| 2747 | if (size == 64) |
| 2748 | to += this->object_->ppc64_local_entry_offset(gsym); |
| 2749 | } |
| 2750 | else |
| 2751 | { |
| 2752 | const Symbol_value<size>* psymval |
| 2753 | = this->object_->local_symbol(this->r_sym_); |
| 2754 | Symbol_value<size> symval; |
| 2755 | typedef Sized_relobj_file<size, big_endian> ObjType; |
| 2756 | typename ObjType::Compute_final_local_value_status status |
| 2757 | = this->object_->compute_final_local_value(this->r_sym_, psymval, |
| 2758 | &symval, symtab); |
| 2759 | if (status != ObjType::CFLV_OK |
| 2760 | || !symval.has_output_value()) |
| 2761 | return true; |
| 2762 | to = symval.value(this->object_, 0); |
| 2763 | if (size == 64) |
| 2764 | to += this->object_->ppc64_local_entry_offset(this->r_sym_); |
| 2765 | } |
| 2766 | if (!(size == 32 && this->r_type_ == elfcpp::R_PPC_PLTREL24)) |
| 2767 | to += this->addend_; |
| 2768 | if (stub_table == NULL) |
| 2769 | stub_table = this->object_->stub_table(this->shndx_); |
| 2770 | if (size == 64 && target->abiversion() < 2) |
| 2771 | { |
| 2772 | unsigned int dest_shndx; |
| 2773 | if (!target->symval_for_branch(symtab, gsym, this->object_, |
| 2774 | &to, &dest_shndx)) |
| 2775 | return true; |
| 2776 | } |
| 2777 | Address delta = to - from; |
| 2778 | if (delta + max_branch_offset >= 2 * max_branch_offset) |
| 2779 | { |
| 2780 | if (stub_table == NULL) |
| 2781 | { |
| 2782 | gold_warning(_("%s:%s: branch in non-executable section," |
| 2783 | " no long branch stub for you"), |
| 2784 | this->object_->name().c_str(), |
| 2785 | this->object_->section_name(this->shndx_).c_str()); |
| 2786 | return true; |
| 2787 | } |
| 2788 | bool save_res = (size == 64 |
| 2789 | && gsym != NULL |
| 2790 | && gsym->source() == Symbol::IN_OUTPUT_DATA |
| 2791 | && gsym->output_data() == target->savres_section()); |
| 2792 | return stub_table->add_long_branch_entry(this->object_, |
| 2793 | this->r_type_, |
| 2794 | from, to, save_res); |
| 2795 | } |
| 2796 | } |
| 2797 | return true; |
| 2798 | } |
| 2799 | |
| 2800 | // Relaxation hook. This is where we do stub generation. |
| 2801 | |
| 2802 | template<int size, bool big_endian> |
| 2803 | bool |
| 2804 | Target_powerpc<size, big_endian>::do_relax(int pass, |
| 2805 | const Input_objects*, |
| 2806 | Symbol_table* symtab, |
| 2807 | Layout* layout, |
| 2808 | const Task* task) |
| 2809 | { |
| 2810 | unsigned int prev_brlt_size = 0; |
| 2811 | if (pass == 1) |
| 2812 | { |
| 2813 | bool thread_safe |
| 2814 | = this->abiversion() < 2 && parameters->options().plt_thread_safe(); |
| 2815 | if (size == 64 |
| 2816 | && this->abiversion() < 2 |
| 2817 | && !thread_safe |
| 2818 | && !parameters->options().user_set_plt_thread_safe()) |
| 2819 | { |
| 2820 | static const char* const thread_starter[] = |
| 2821 | { |
| 2822 | "pthread_create", |
| 2823 | /* libstdc++ */ |
| 2824 | "_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE", |
| 2825 | /* librt */ |
| 2826 | "aio_init", "aio_read", "aio_write", "aio_fsync", "lio_listio", |
| 2827 | "mq_notify", "create_timer", |
| 2828 | /* libanl */ |
| 2829 | "getaddrinfo_a", |
| 2830 | /* libgomp */ |
| 2831 | "GOMP_parallel", |
| 2832 | "GOMP_parallel_start", |
| 2833 | "GOMP_parallel_loop_static", |
| 2834 | "GOMP_parallel_loop_static_start", |
| 2835 | "GOMP_parallel_loop_dynamic", |
| 2836 | "GOMP_parallel_loop_dynamic_start", |
| 2837 | "GOMP_parallel_loop_guided", |
| 2838 | "GOMP_parallel_loop_guided_start", |
| 2839 | "GOMP_parallel_loop_runtime", |
| 2840 | "GOMP_parallel_loop_runtime_start", |
| 2841 | "GOMP_parallel_sections", |
| 2842 | "GOMP_parallel_sections_start", |
| 2843 | /* libgo */ |
| 2844 | "__go_go", |
| 2845 | }; |
| 2846 | |
| 2847 | if (parameters->options().shared()) |
| 2848 | thread_safe = true; |
| 2849 | else |
| 2850 | { |
| 2851 | for (unsigned int i = 0; |
| 2852 | i < sizeof(thread_starter) / sizeof(thread_starter[0]); |
| 2853 | i++) |
| 2854 | { |
| 2855 | Symbol* sym = symtab->lookup(thread_starter[i], NULL); |
| 2856 | thread_safe = (sym != NULL |
| 2857 | && sym->in_reg() |
| 2858 | && sym->in_real_elf()); |
| 2859 | if (thread_safe) |
| 2860 | break; |
| 2861 | } |
| 2862 | } |
| 2863 | } |
| 2864 | this->plt_thread_safe_ = thread_safe; |
| 2865 | } |
| 2866 | |
| 2867 | if (pass == 1) |
| 2868 | { |
| 2869 | this->stub_group_size_ = parameters->options().stub_group_size(); |
| 2870 | bool no_size_errors = true; |
| 2871 | if (this->stub_group_size_ == 1) |
| 2872 | this->stub_group_size_ = 0x1c00000; |
| 2873 | else if (this->stub_group_size_ == -1) |
| 2874 | this->stub_group_size_ = -0x1e00000; |
| 2875 | else |
| 2876 | no_size_errors = false; |
| 2877 | this->group_sections(layout, task, no_size_errors); |
| 2878 | } |
| 2879 | else if (this->relax_failed_ && this->relax_fail_count_ < 3) |
| 2880 | { |
| 2881 | this->branch_lookup_table_.clear(); |
| 2882 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 2883 | p != this->stub_tables_.end(); |
| 2884 | ++p) |
| 2885 | { |
| 2886 | (*p)->clear_stubs(true); |
| 2887 | } |
| 2888 | this->stub_tables_.clear(); |
| 2889 | this->stub_group_size_ = this->stub_group_size_ / 4 * 3; |
| 2890 | gold_info(_("%s: stub group size is too large; retrying with %d"), |
| 2891 | program_name, this->stub_group_size_); |
| 2892 | this->group_sections(layout, task, true); |
| 2893 | } |
| 2894 | |
| 2895 | // We need address of stub tables valid for make_stub. |
| 2896 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 2897 | p != this->stub_tables_.end(); |
| 2898 | ++p) |
| 2899 | { |
| 2900 | const Powerpc_relobj<size, big_endian>* object |
| 2901 | = static_cast<const Powerpc_relobj<size, big_endian>*>((*p)->relobj()); |
| 2902 | Address off = object->get_output_section_offset((*p)->shndx()); |
| 2903 | gold_assert(off != invalid_address); |
| 2904 | Output_section* os = (*p)->output_section(); |
| 2905 | (*p)->set_address_and_size(os, off); |
| 2906 | } |
| 2907 | |
| 2908 | if (pass != 1) |
| 2909 | { |
| 2910 | // Clear plt call stubs, long branch stubs and branch lookup table. |
| 2911 | prev_brlt_size = this->branch_lookup_table_.size(); |
| 2912 | this->branch_lookup_table_.clear(); |
| 2913 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 2914 | p != this->stub_tables_.end(); |
| 2915 | ++p) |
| 2916 | { |
| 2917 | (*p)->clear_stubs(false); |
| 2918 | } |
| 2919 | } |
| 2920 | |
| 2921 | // Build all the stubs. |
| 2922 | this->relax_failed_ = false; |
| 2923 | Stub_table<size, big_endian>* ifunc_stub_table |
| 2924 | = this->stub_tables_.size() == 0 ? NULL : this->stub_tables_[0]; |
| 2925 | Stub_table<size, big_endian>* one_stub_table |
| 2926 | = this->stub_tables_.size() != 1 ? NULL : ifunc_stub_table; |
| 2927 | for (typename Branches::const_iterator b = this->branch_info_.begin(); |
| 2928 | b != this->branch_info_.end(); |
| 2929 | b++) |
| 2930 | { |
| 2931 | if (!b->make_stub(one_stub_table, ifunc_stub_table, symtab) |
| 2932 | && !this->relax_failed_) |
| 2933 | { |
| 2934 | this->relax_failed_ = true; |
| 2935 | this->relax_fail_count_++; |
| 2936 | if (this->relax_fail_count_ < 3) |
| 2937 | return true; |
| 2938 | } |
| 2939 | } |
| 2940 | |
| 2941 | // Did anything change size? |
| 2942 | unsigned int num_huge_branches = this->branch_lookup_table_.size(); |
| 2943 | bool again = num_huge_branches != prev_brlt_size; |
| 2944 | if (size == 64 && num_huge_branches != 0) |
| 2945 | this->make_brlt_section(layout); |
| 2946 | if (size == 64 && again) |
| 2947 | this->brlt_section_->set_current_size(num_huge_branches); |
| 2948 | |
| 2949 | typedef Unordered_set<Output_section*> Output_sections; |
| 2950 | Output_sections os_need_update; |
| 2951 | for (typename Stub_tables::iterator p = this->stub_tables_.begin(); |
| 2952 | p != this->stub_tables_.end(); |
| 2953 | ++p) |
| 2954 | { |
| 2955 | if ((*p)->size_update()) |
| 2956 | { |
| 2957 | again = true; |
| 2958 | (*p)->add_eh_frame(layout); |
| 2959 | os_need_update.insert((*p)->output_section()); |
| 2960 | } |
| 2961 | } |
| 2962 | |
| 2963 | // Set output section offsets for all input sections in an output |
| 2964 | // section that just changed size. Anything past the stubs will |
| 2965 | // need updating. |
| 2966 | for (typename Output_sections::iterator p = os_need_update.begin(); |
| 2967 | p != os_need_update.end(); |
| 2968 | p++) |
| 2969 | { |
| 2970 | Output_section* os = *p; |
| 2971 | Address off = 0; |
| 2972 | typedef Output_section::Input_section_list Input_section_list; |
| 2973 | for (Input_section_list::const_iterator i = os->input_sections().begin(); |
| 2974 | i != os->input_sections().end(); |
| 2975 | ++i) |
| 2976 | { |
| 2977 | off = align_address(off, i->addralign()); |
| 2978 | if (i->is_input_section() || i->is_relaxed_input_section()) |
| 2979 | i->relobj()->set_section_offset(i->shndx(), off); |
| 2980 | if (i->is_relaxed_input_section()) |
| 2981 | { |
| 2982 | Stub_table<size, big_endian>* stub_table |
| 2983 | = static_cast<Stub_table<size, big_endian>*>( |
| 2984 | i->relaxed_input_section()); |
| 2985 | off += stub_table->set_address_and_size(os, off); |
| 2986 | } |
| 2987 | else |
| 2988 | off += i->data_size(); |
| 2989 | } |
| 2990 | // If .branch_lt is part of this output section, then we have |
| 2991 | // just done the offset adjustment. |
| 2992 | os->clear_section_offsets_need_adjustment(); |
| 2993 | } |
| 2994 | |
| 2995 | if (size == 64 |
| 2996 | && !again |
| 2997 | && num_huge_branches != 0 |
| 2998 | && parameters->options().output_is_position_independent()) |
| 2999 | { |
| 3000 | // Fill in the BRLT relocs. |
| 3001 | this->brlt_section_->reset_brlt_sizes(); |
| 3002 | for (typename Branch_lookup_table::const_iterator p |
| 3003 | = this->branch_lookup_table_.begin(); |
| 3004 | p != this->branch_lookup_table_.end(); |
| 3005 | ++p) |
| 3006 | { |
| 3007 | this->brlt_section_->add_reloc(p->first, p->second); |
| 3008 | } |
| 3009 | this->brlt_section_->finalize_brlt_sizes(); |
| 3010 | } |
| 3011 | return again; |
| 3012 | } |
| 3013 | |
| 3014 | template<int size, bool big_endian> |
| 3015 | void |
| 3016 | Target_powerpc<size, big_endian>::do_plt_fde_location(const Output_data* plt, |
| 3017 | unsigned char* oview, |
| 3018 | uint64_t* paddress, |
| 3019 | off_t* plen) const |
| 3020 | { |
| 3021 | uint64_t address = plt->address(); |
| 3022 | off_t len = plt->data_size(); |
| 3023 | |
| 3024 | if (plt == this->glink_) |
| 3025 | { |
| 3026 | // See Output_data_glink::do_write() for glink contents. |
| 3027 | if (len == 0) |
| 3028 | { |
| 3029 | gold_assert(parameters->doing_static_link()); |
| 3030 | // Static linking may need stubs, to support ifunc and long |
| 3031 | // branches. We need to create an output section for |
| 3032 | // .eh_frame early in the link process, to have a place to |
| 3033 | // attach stub .eh_frame info. We also need to have |
| 3034 | // registered a CIE that matches the stub CIE. Both of |
| 3035 | // these requirements are satisfied by creating an FDE and |
| 3036 | // CIE for .glink, even though static linking will leave |
| 3037 | // .glink zero length. |
| 3038 | // ??? Hopefully generating an FDE with a zero address range |
| 3039 | // won't confuse anything that consumes .eh_frame info. |
| 3040 | } |
| 3041 | else if (size == 64) |
| 3042 | { |
| 3043 | // There is one word before __glink_PLTresolve |
| 3044 | address += 8; |
| 3045 | len -= 8; |
| 3046 | } |
| 3047 | else if (parameters->options().output_is_position_independent()) |
| 3048 | { |
| 3049 | // There are two FDEs for a position independent glink. |
| 3050 | // The first covers the branch table, the second |
| 3051 | // __glink_PLTresolve at the end of glink. |
| 3052 | off_t resolve_size = this->glink_->pltresolve_size; |
| 3053 | if (oview[9] == elfcpp::DW_CFA_nop) |
| 3054 | len -= resolve_size; |
| 3055 | else |
| 3056 | { |
| 3057 | address += len - resolve_size; |
| 3058 | len = resolve_size; |
| 3059 | } |
| 3060 | } |
| 3061 | } |
| 3062 | else |
| 3063 | { |
| 3064 | // Must be a stub table. |
| 3065 | const Stub_table<size, big_endian>* stub_table |
| 3066 | = static_cast<const Stub_table<size, big_endian>*>(plt); |
| 3067 | uint64_t stub_address = stub_table->stub_address(); |
| 3068 | len -= stub_address - address; |
| 3069 | address = stub_address; |
| 3070 | } |
| 3071 | |
| 3072 | *paddress = address; |
| 3073 | *plen = len; |
| 3074 | } |
| 3075 | |
| 3076 | // A class to handle the PLT data. |
| 3077 | |
| 3078 | template<int size, bool big_endian> |
| 3079 | class Output_data_plt_powerpc : public Output_section_data_build |
| 3080 | { |
| 3081 | public: |
| 3082 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, |
| 3083 | size, big_endian> Reloc_section; |
| 3084 | |
| 3085 | Output_data_plt_powerpc(Target_powerpc<size, big_endian>* targ, |
| 3086 | Reloc_section* plt_rel, |
| 3087 | const char* name) |
| 3088 | : Output_section_data_build(size == 32 ? 4 : 8), |
| 3089 | rel_(plt_rel), |
| 3090 | targ_(targ), |
| 3091 | name_(name) |
| 3092 | { } |
| 3093 | |
| 3094 | // Add an entry to the PLT. |
| 3095 | void |
| 3096 | add_entry(Symbol*); |
| 3097 | |
| 3098 | void |
| 3099 | add_ifunc_entry(Symbol*); |
| 3100 | |
| 3101 | void |
| 3102 | add_local_ifunc_entry(Sized_relobj_file<size, big_endian>*, unsigned int); |
| 3103 | |
| 3104 | // Return the .rela.plt section data. |
| 3105 | Reloc_section* |
| 3106 | rel_plt() const |
| 3107 | { |
| 3108 | return this->rel_; |
| 3109 | } |
| 3110 | |
| 3111 | // Return the number of PLT entries. |
| 3112 | unsigned int |
| 3113 | entry_count() const |
| 3114 | { |
| 3115 | if (this->current_data_size() == 0) |
| 3116 | return 0; |
| 3117 | return ((this->current_data_size() - this->first_plt_entry_offset()) |
| 3118 | / this->plt_entry_size()); |
| 3119 | } |
| 3120 | |
| 3121 | protected: |
| 3122 | void |
| 3123 | do_adjust_output_section(Output_section* os) |
| 3124 | { |
| 3125 | os->set_entsize(0); |
| 3126 | } |
| 3127 | |
| 3128 | // Write to a map file. |
| 3129 | void |
| 3130 | do_print_to_mapfile(Mapfile* mapfile) const |
| 3131 | { mapfile->print_output_data(this, this->name_); } |
| 3132 | |
| 3133 | private: |
| 3134 | // Return the offset of the first non-reserved PLT entry. |
| 3135 | unsigned int |
| 3136 | first_plt_entry_offset() const |
| 3137 | { |
| 3138 | // IPLT has no reserved entry. |
| 3139 | if (this->name_[3] == 'I') |
| 3140 | return 0; |
| 3141 | return this->targ_->first_plt_entry_offset(); |
| 3142 | } |
| 3143 | |
| 3144 | // Return the size of each PLT entry. |
| 3145 | unsigned int |
| 3146 | plt_entry_size() const |
| 3147 | { |
| 3148 | return this->targ_->plt_entry_size(); |
| 3149 | } |
| 3150 | |
| 3151 | // Write out the PLT data. |
| 3152 | void |
| 3153 | do_write(Output_file*); |
| 3154 | |
| 3155 | // The reloc section. |
| 3156 | Reloc_section* rel_; |
| 3157 | // Allows access to .glink for do_write. |
| 3158 | Target_powerpc<size, big_endian>* targ_; |
| 3159 | // What to report in map file. |
| 3160 | const char *name_; |
| 3161 | }; |
| 3162 | |
| 3163 | // Add an entry to the PLT. |
| 3164 | |
| 3165 | template<int size, bool big_endian> |
| 3166 | void |
| 3167 | Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym) |
| 3168 | { |
| 3169 | if (!gsym->has_plt_offset()) |
| 3170 | { |
| 3171 | section_size_type off = this->current_data_size(); |
| 3172 | if (off == 0) |
| 3173 | off += this->first_plt_entry_offset(); |
| 3174 | gsym->set_plt_offset(off); |
| 3175 | gsym->set_needs_dynsym_entry(); |
| 3176 | unsigned int dynrel = elfcpp::R_POWERPC_JMP_SLOT; |
| 3177 | this->rel_->add_global(gsym, dynrel, this, off, 0); |
| 3178 | off += this->plt_entry_size(); |
| 3179 | this->set_current_data_size(off); |
| 3180 | } |
| 3181 | } |
| 3182 | |
| 3183 | // Add an entry for a global ifunc symbol that resolves locally, to the IPLT. |
| 3184 | |
| 3185 | template<int size, bool big_endian> |
| 3186 | void |
| 3187 | Output_data_plt_powerpc<size, big_endian>::add_ifunc_entry(Symbol* gsym) |
| 3188 | { |
| 3189 | if (!gsym->has_plt_offset()) |
| 3190 | { |
| 3191 | section_size_type off = this->current_data_size(); |
| 3192 | gsym->set_plt_offset(off); |
| 3193 | unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| 3194 | if (size == 64 && this->targ_->abiversion() < 2) |
| 3195 | dynrel = elfcpp::R_PPC64_JMP_IREL; |
| 3196 | this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0); |
| 3197 | off += this->plt_entry_size(); |
| 3198 | this->set_current_data_size(off); |
| 3199 | } |
| 3200 | } |
| 3201 | |
| 3202 | // Add an entry for a local ifunc symbol to the IPLT. |
| 3203 | |
| 3204 | template<int size, bool big_endian> |
| 3205 | void |
| 3206 | Output_data_plt_powerpc<size, big_endian>::add_local_ifunc_entry( |
| 3207 | Sized_relobj_file<size, big_endian>* relobj, |
| 3208 | unsigned int local_sym_index) |
| 3209 | { |
| 3210 | if (!relobj->local_has_plt_offset(local_sym_index)) |
| 3211 | { |
| 3212 | section_size_type off = this->current_data_size(); |
| 3213 | relobj->set_local_plt_offset(local_sym_index, off); |
| 3214 | unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE; |
| 3215 | if (size == 64 && this->targ_->abiversion() < 2) |
| 3216 | dynrel = elfcpp::R_PPC64_JMP_IREL; |
| 3217 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel, |
| 3218 | this, off, 0); |
| 3219 | off += this->plt_entry_size(); |
| 3220 | this->set_current_data_size(off); |
| 3221 | } |
| 3222 | } |
| 3223 | |
| 3224 | static const uint32_t add_0_11_11 = 0x7c0b5a14; |
| 3225 | static const uint32_t add_2_2_11 = 0x7c425a14; |
| 3226 | static const uint32_t add_2_2_12 = 0x7c426214; |
| 3227 | static const uint32_t add_3_3_2 = 0x7c631214; |
| 3228 | static const uint32_t add_3_3_13 = 0x7c636a14; |
| 3229 | static const uint32_t add_11_0_11 = 0x7d605a14; |
| 3230 | static const uint32_t add_11_2_11 = 0x7d625a14; |
| 3231 | static const uint32_t add_11_11_2 = 0x7d6b1214; |
| 3232 | static const uint32_t addi_0_12 = 0x380c0000; |
| 3233 | static const uint32_t addi_2_2 = 0x38420000; |
| 3234 | static const uint32_t addi_3_3 = 0x38630000; |
| 3235 | static const uint32_t addi_11_11 = 0x396b0000; |
| 3236 | static const uint32_t addi_12_1 = 0x39810000; |
| 3237 | static const uint32_t addi_12_12 = 0x398c0000; |
| 3238 | static const uint32_t addis_0_2 = 0x3c020000; |
| 3239 | static const uint32_t addis_0_13 = 0x3c0d0000; |
| 3240 | static const uint32_t addis_2_12 = 0x3c4c0000; |
| 3241 | static const uint32_t addis_11_2 = 0x3d620000; |
| 3242 | static const uint32_t addis_11_11 = 0x3d6b0000; |
| 3243 | static const uint32_t addis_11_30 = 0x3d7e0000; |
| 3244 | static const uint32_t addis_12_1 = 0x3d810000; |
| 3245 | static const uint32_t addis_12_2 = 0x3d820000; |
| 3246 | static const uint32_t addis_12_12 = 0x3d8c0000; |
| 3247 | static const uint32_t b = 0x48000000; |
| 3248 | static const uint32_t bcl_20_31 = 0x429f0005; |
| 3249 | static const uint32_t bctr = 0x4e800420; |
| 3250 | static const uint32_t blr = 0x4e800020; |
| 3251 | static const uint32_t bnectr_p4 = 0x4ce20420; |
| 3252 | static const uint32_t cmpld_7_12_0 = 0x7fac0040; |
| 3253 | static const uint32_t cmpldi_2_0 = 0x28220000; |
| 3254 | static const uint32_t cror_15_15_15 = 0x4def7b82; |
| 3255 | static const uint32_t cror_31_31_31 = 0x4ffffb82; |
| 3256 | static const uint32_t ld_0_1 = 0xe8010000; |
| 3257 | static const uint32_t ld_0_12 = 0xe80c0000; |
| 3258 | static const uint32_t ld_2_1 = 0xe8410000; |
| 3259 | static const uint32_t ld_2_2 = 0xe8420000; |
| 3260 | static const uint32_t ld_2_11 = 0xe84b0000; |
| 3261 | static const uint32_t ld_2_12 = 0xe84c0000; |
| 3262 | static const uint32_t ld_11_2 = 0xe9620000; |
| 3263 | static const uint32_t ld_11_11 = 0xe96b0000; |
| 3264 | static const uint32_t ld_12_2 = 0xe9820000; |
| 3265 | static const uint32_t ld_12_11 = 0xe98b0000; |
| 3266 | static const uint32_t ld_12_12 = 0xe98c0000; |
| 3267 | static const uint32_t lfd_0_1 = 0xc8010000; |
| 3268 | static const uint32_t li_0_0 = 0x38000000; |
| 3269 | static const uint32_t li_12_0 = 0x39800000; |
| 3270 | static const uint32_t lis_0 = 0x3c000000; |
| 3271 | static const uint32_t lis_2 = 0x3c400000; |
| 3272 | static const uint32_t lis_11 = 0x3d600000; |
| 3273 | static const uint32_t lis_12 = 0x3d800000; |
| 3274 | static const uint32_t lvx_0_12_0 = 0x7c0c00ce; |
| 3275 | static const uint32_t lwz_0_12 = 0x800c0000; |
| 3276 | static const uint32_t lwz_11_11 = 0x816b0000; |
| 3277 | static const uint32_t lwz_11_30 = 0x817e0000; |
| 3278 | static const uint32_t lwz_12_12 = 0x818c0000; |
| 3279 | static const uint32_t lwzu_0_12 = 0x840c0000; |
| 3280 | static const uint32_t mflr_0 = 0x7c0802a6; |
| 3281 | static const uint32_t mflr_11 = 0x7d6802a6; |
| 3282 | static const uint32_t mflr_12 = 0x7d8802a6; |
| 3283 | static const uint32_t mtctr_0 = 0x7c0903a6; |
| 3284 | static const uint32_t mtctr_11 = 0x7d6903a6; |
| 3285 | static const uint32_t mtctr_12 = 0x7d8903a6; |
| 3286 | static const uint32_t mtlr_0 = 0x7c0803a6; |
| 3287 | static const uint32_t mtlr_12 = 0x7d8803a6; |
| 3288 | static const uint32_t nop = 0x60000000; |
| 3289 | static const uint32_t ori_0_0_0 = 0x60000000; |
| 3290 | static const uint32_t srdi_0_0_2 = 0x7800f082; |
| 3291 | static const uint32_t std_0_1 = 0xf8010000; |
| 3292 | static const uint32_t std_0_12 = 0xf80c0000; |
| 3293 | static const uint32_t std_2_1 = 0xf8410000; |
| 3294 | static const uint32_t stfd_0_1 = 0xd8010000; |
| 3295 | static const uint32_t stvx_0_12_0 = 0x7c0c01ce; |
| 3296 | static const uint32_t sub_11_11_12 = 0x7d6c5850; |
| 3297 | static const uint32_t sub_12_12_11 = 0x7d8b6050; |
| 3298 | static const uint32_t xor_2_12_12 = 0x7d826278; |
| 3299 | static const uint32_t xor_11_12_12 = 0x7d8b6278; |
| 3300 | |
| 3301 | // Write out the PLT. |
| 3302 | |
| 3303 | template<int size, bool big_endian> |
| 3304 | void |
| 3305 | Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of) |
| 3306 | { |
| 3307 | if (size == 32 && this->name_[3] != 'I') |
| 3308 | { |
| 3309 | const section_size_type offset = this->offset(); |
| 3310 | const section_size_type oview_size |
| 3311 | = convert_to_section_size_type(this->data_size()); |
| 3312 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 3313 | unsigned char* pov = oview; |
| 3314 | unsigned char* endpov = oview + oview_size; |
| 3315 | |
| 3316 | // The address of the .glink branch table |
| 3317 | const Output_data_glink<size, big_endian>* glink |
| 3318 | = this->targ_->glink_section(); |
| 3319 | elfcpp::Elf_types<32>::Elf_Addr branch_tab = glink->address(); |
| 3320 | |
| 3321 | while (pov < endpov) |
| 3322 | { |
| 3323 | elfcpp::Swap<32, big_endian>::writeval(pov, branch_tab); |
| 3324 | pov += 4; |
| 3325 | branch_tab += 4; |
| 3326 | } |
| 3327 | |
| 3328 | of->write_output_view(offset, oview_size, oview); |
| 3329 | } |
| 3330 | } |
| 3331 | |
| 3332 | // Create the PLT section. |
| 3333 | |
| 3334 | template<int size, bool big_endian> |
| 3335 | void |
| 3336 | Target_powerpc<size, big_endian>::make_plt_section(Symbol_table* symtab, |
| 3337 | Layout* layout) |
| 3338 | { |
| 3339 | if (this->plt_ == NULL) |
| 3340 | { |
| 3341 | if (this->got_ == NULL) |
| 3342 | this->got_section(symtab, layout); |
| 3343 | |
| 3344 | if (this->glink_ == NULL) |
| 3345 | make_glink_section(layout); |
| 3346 | |
| 3347 | // Ensure that .rela.dyn always appears before .rela.plt This is |
| 3348 | // necessary due to how, on PowerPC and some other targets, .rela.dyn |
| 3349 | // needs to include .rela.plt in its range. |
| 3350 | this->rela_dyn_section(layout); |
| 3351 | |
| 3352 | Reloc_section* plt_rel = new Reloc_section(false); |
| 3353 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 3354 | elfcpp::SHF_ALLOC, plt_rel, |
| 3355 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 3356 | this->plt_ |
| 3357 | = new Output_data_plt_powerpc<size, big_endian>(this, plt_rel, |
| 3358 | "** PLT"); |
| 3359 | layout->add_output_section_data(".plt", |
| 3360 | (size == 32 |
| 3361 | ? elfcpp::SHT_PROGBITS |
| 3362 | : elfcpp::SHT_NOBITS), |
| 3363 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 3364 | this->plt_, |
| 3365 | (size == 32 |
| 3366 | ? ORDER_SMALL_DATA |
| 3367 | : ORDER_SMALL_BSS), |
| 3368 | false); |
| 3369 | } |
| 3370 | } |
| 3371 | |
| 3372 | // Create the IPLT section. |
| 3373 | |
| 3374 | template<int size, bool big_endian> |
| 3375 | void |
| 3376 | Target_powerpc<size, big_endian>::make_iplt_section(Symbol_table* symtab, |
| 3377 | Layout* layout) |
| 3378 | { |
| 3379 | if (this->iplt_ == NULL) |
| 3380 | { |
| 3381 | this->make_plt_section(symtab, layout); |
| 3382 | |
| 3383 | Reloc_section* iplt_rel = new Reloc_section(false); |
| 3384 | this->rela_dyn_->output_section()->add_output_section_data(iplt_rel); |
| 3385 | this->iplt_ |
| 3386 | = new Output_data_plt_powerpc<size, big_endian>(this, iplt_rel, |
| 3387 | "** IPLT"); |
| 3388 | this->plt_->output_section()->add_output_section_data(this->iplt_); |
| 3389 | } |
| 3390 | } |
| 3391 | |
| 3392 | // A section for huge long branch addresses, similar to plt section. |
| 3393 | |
| 3394 | template<int size, bool big_endian> |
| 3395 | class Output_data_brlt_powerpc : public Output_section_data_build |
| 3396 | { |
| 3397 | public: |
| 3398 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 3399 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, |
| 3400 | size, big_endian> Reloc_section; |
| 3401 | |
| 3402 | Output_data_brlt_powerpc(Target_powerpc<size, big_endian>* targ, |
| 3403 | Reloc_section* brlt_rel) |
| 3404 | : Output_section_data_build(size == 32 ? 4 : 8), |
| 3405 | rel_(brlt_rel), |
| 3406 | targ_(targ) |
| 3407 | { } |
| 3408 | |
| 3409 | void |
| 3410 | reset_brlt_sizes() |
| 3411 | { |
| 3412 | this->reset_data_size(); |
| 3413 | this->rel_->reset_data_size(); |
| 3414 | } |
| 3415 | |
| 3416 | void |
| 3417 | finalize_brlt_sizes() |
| 3418 | { |
| 3419 | this->finalize_data_size(); |
| 3420 | this->rel_->finalize_data_size(); |
| 3421 | } |
| 3422 | |
| 3423 | // Add a reloc for an entry in the BRLT. |
| 3424 | void |
| 3425 | add_reloc(Address to, unsigned int off) |
| 3426 | { this->rel_->add_relative(elfcpp::R_POWERPC_RELATIVE, this, off, to); } |
| 3427 | |
| 3428 | // Update section and reloc section size. |
| 3429 | void |
| 3430 | set_current_size(unsigned int num_branches) |
| 3431 | { |
| 3432 | this->reset_address_and_file_offset(); |
| 3433 | this->set_current_data_size(num_branches * 16); |
| 3434 | this->finalize_data_size(); |
| 3435 | Output_section* os = this->output_section(); |
| 3436 | os->set_section_offsets_need_adjustment(); |
| 3437 | if (this->rel_ != NULL) |
| 3438 | { |
| 3439 | unsigned int reloc_size |
| 3440 | = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| 3441 | this->rel_->reset_address_and_file_offset(); |
| 3442 | this->rel_->set_current_data_size(num_branches * reloc_size); |
| 3443 | this->rel_->finalize_data_size(); |
| 3444 | Output_section* os = this->rel_->output_section(); |
| 3445 | os->set_section_offsets_need_adjustment(); |
| 3446 | } |
| 3447 | } |
| 3448 | |
| 3449 | protected: |
| 3450 | void |
| 3451 | do_adjust_output_section(Output_section* os) |
| 3452 | { |
| 3453 | os->set_entsize(0); |
| 3454 | } |
| 3455 | |
| 3456 | // Write to a map file. |
| 3457 | void |
| 3458 | do_print_to_mapfile(Mapfile* mapfile) const |
| 3459 | { mapfile->print_output_data(this, "** BRLT"); } |
| 3460 | |
| 3461 | private: |
| 3462 | // Write out the BRLT data. |
| 3463 | void |
| 3464 | do_write(Output_file*); |
| 3465 | |
| 3466 | // The reloc section. |
| 3467 | Reloc_section* rel_; |
| 3468 | Target_powerpc<size, big_endian>* targ_; |
| 3469 | }; |
| 3470 | |
| 3471 | // Make the branch lookup table section. |
| 3472 | |
| 3473 | template<int size, bool big_endian> |
| 3474 | void |
| 3475 | Target_powerpc<size, big_endian>::make_brlt_section(Layout* layout) |
| 3476 | { |
| 3477 | if (size == 64 && this->brlt_section_ == NULL) |
| 3478 | { |
| 3479 | Reloc_section* brlt_rel = NULL; |
| 3480 | bool is_pic = parameters->options().output_is_position_independent(); |
| 3481 | if (is_pic) |
| 3482 | { |
| 3483 | // When PIC we can't fill in .branch_lt (like .plt it can be |
| 3484 | // a bss style section) but must initialise at runtime via |
| 3485 | // dynamic relocats. |
| 3486 | this->rela_dyn_section(layout); |
| 3487 | brlt_rel = new Reloc_section(false); |
| 3488 | this->rela_dyn_->output_section()->add_output_section_data(brlt_rel); |
| 3489 | } |
| 3490 | this->brlt_section_ |
| 3491 | = new Output_data_brlt_powerpc<size, big_endian>(this, brlt_rel); |
| 3492 | if (this->plt_ && is_pic) |
| 3493 | this->plt_->output_section() |
| 3494 | ->add_output_section_data(this->brlt_section_); |
| 3495 | else |
| 3496 | layout->add_output_section_data(".branch_lt", |
| 3497 | (is_pic ? elfcpp::SHT_NOBITS |
| 3498 | : elfcpp::SHT_PROGBITS), |
| 3499 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 3500 | this->brlt_section_, |
| 3501 | (is_pic ? ORDER_SMALL_BSS |
| 3502 | : ORDER_SMALL_DATA), |
| 3503 | false); |
| 3504 | } |
| 3505 | } |
| 3506 | |
| 3507 | // Write out .branch_lt when non-PIC. |
| 3508 | |
| 3509 | template<int size, bool big_endian> |
| 3510 | void |
| 3511 | Output_data_brlt_powerpc<size, big_endian>::do_write(Output_file* of) |
| 3512 | { |
| 3513 | if (size == 64 && !parameters->options().output_is_position_independent()) |
| 3514 | { |
| 3515 | const section_size_type offset = this->offset(); |
| 3516 | const section_size_type oview_size |
| 3517 | = convert_to_section_size_type(this->data_size()); |
| 3518 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 3519 | |
| 3520 | this->targ_->write_branch_lookup_table(oview); |
| 3521 | of->write_output_view(offset, oview_size, oview); |
| 3522 | } |
| 3523 | } |
| 3524 | |
| 3525 | static inline uint32_t |
| 3526 | l(uint32_t a) |
| 3527 | { |
| 3528 | return a & 0xffff; |
| 3529 | } |
| 3530 | |
| 3531 | static inline uint32_t |
| 3532 | hi(uint32_t a) |
| 3533 | { |
| 3534 | return l(a >> 16); |
| 3535 | } |
| 3536 | |
| 3537 | static inline uint32_t |
| 3538 | ha(uint32_t a) |
| 3539 | { |
| 3540 | return hi(a + 0x8000); |
| 3541 | } |
| 3542 | |
| 3543 | template<int size> |
| 3544 | struct Eh_cie |
| 3545 | { |
| 3546 | static const unsigned char eh_frame_cie[12]; |
| 3547 | }; |
| 3548 | |
| 3549 | template<int size> |
| 3550 | const unsigned char Eh_cie<size>::eh_frame_cie[] = |
| 3551 | { |
| 3552 | 1, // CIE version. |
| 3553 | 'z', 'R', 0, // Augmentation string. |
| 3554 | 4, // Code alignment. |
| 3555 | 0x80 - size / 8 , // Data alignment. |
| 3556 | 65, // RA reg. |
| 3557 | 1, // Augmentation size. |
| 3558 | (elfcpp::DW_EH_PE_pcrel |
| 3559 | | elfcpp::DW_EH_PE_sdata4), // FDE encoding. |
| 3560 | elfcpp::DW_CFA_def_cfa, 1, 0 // def_cfa: r1 offset 0. |
| 3561 | }; |
| 3562 | |
| 3563 | // Describe __glink_PLTresolve use of LR, 64-bit version ABIv1. |
| 3564 | static const unsigned char glink_eh_frame_fde_64v1[] = |
| 3565 | { |
| 3566 | 0, 0, 0, 0, // Replaced with offset to .glink. |
| 3567 | 0, 0, 0, 0, // Replaced with size of .glink. |
| 3568 | 0, // Augmentation size. |
| 3569 | elfcpp::DW_CFA_advance_loc + 1, |
| 3570 | elfcpp::DW_CFA_register, 65, 12, |
| 3571 | elfcpp::DW_CFA_advance_loc + 4, |
| 3572 | elfcpp::DW_CFA_restore_extended, 65 |
| 3573 | }; |
| 3574 | |
| 3575 | // Describe __glink_PLTresolve use of LR, 64-bit version ABIv2. |
| 3576 | static const unsigned char glink_eh_frame_fde_64v2[] = |
| 3577 | { |
| 3578 | 0, 0, 0, 0, // Replaced with offset to .glink. |
| 3579 | 0, 0, 0, 0, // Replaced with size of .glink. |
| 3580 | 0, // Augmentation size. |
| 3581 | elfcpp::DW_CFA_advance_loc + 1, |
| 3582 | elfcpp::DW_CFA_register, 65, 0, |
| 3583 | elfcpp::DW_CFA_advance_loc + 4, |
| 3584 | elfcpp::DW_CFA_restore_extended, 65 |
| 3585 | }; |
| 3586 | |
| 3587 | // Describe __glink_PLTresolve use of LR, 32-bit version. |
| 3588 | static const unsigned char glink_eh_frame_fde_32[] = |
| 3589 | { |
| 3590 | 0, 0, 0, 0, // Replaced with offset to .glink. |
| 3591 | 0, 0, 0, 0, // Replaced with size of .glink. |
| 3592 | 0, // Augmentation size. |
| 3593 | elfcpp::DW_CFA_advance_loc + 2, |
| 3594 | elfcpp::DW_CFA_register, 65, 0, |
| 3595 | elfcpp::DW_CFA_advance_loc + 4, |
| 3596 | elfcpp::DW_CFA_restore_extended, 65 |
| 3597 | }; |
| 3598 | |
| 3599 | static const unsigned char default_fde[] = |
| 3600 | { |
| 3601 | 0, 0, 0, 0, // Replaced with offset to stubs. |
| 3602 | 0, 0, 0, 0, // Replaced with size of stubs. |
| 3603 | 0, // Augmentation size. |
| 3604 | elfcpp::DW_CFA_nop, // Pad. |
| 3605 | elfcpp::DW_CFA_nop, |
| 3606 | elfcpp::DW_CFA_nop |
| 3607 | }; |
| 3608 | |
| 3609 | template<bool big_endian> |
| 3610 | static inline void |
| 3611 | write_insn(unsigned char* p, uint32_t v) |
| 3612 | { |
| 3613 | elfcpp::Swap<32, big_endian>::writeval(p, v); |
| 3614 | } |
| 3615 | |
| 3616 | // Stub_table holds information about plt and long branch stubs. |
| 3617 | // Stubs are built in an area following some input section determined |
| 3618 | // by group_sections(). This input section is converted to a relaxed |
| 3619 | // input section allowing it to be resized to accommodate the stubs |
| 3620 | |
| 3621 | template<int size, bool big_endian> |
| 3622 | class Stub_table : public Output_relaxed_input_section |
| 3623 | { |
| 3624 | public: |
| 3625 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 3626 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 3627 | |
| 3628 | Stub_table(Target_powerpc<size, big_endian>* targ, |
| 3629 | Output_section* output_section, |
| 3630 | const Output_section::Input_section* owner) |
| 3631 | : Output_relaxed_input_section(owner->relobj(), owner->shndx(), |
| 3632 | owner->relobj() |
| 3633 | ->section_addralign(owner->shndx())), |
| 3634 | targ_(targ), plt_call_stubs_(), long_branch_stubs_(), |
| 3635 | orig_data_size_(owner->current_data_size()), |
| 3636 | plt_size_(0), last_plt_size_(0), |
| 3637 | branch_size_(0), last_branch_size_(0), eh_frame_added_(false), |
| 3638 | need_save_res_(false) |
| 3639 | { |
| 3640 | this->set_output_section(output_section); |
| 3641 | |
| 3642 | std::vector<Output_relaxed_input_section*> new_relaxed; |
| 3643 | new_relaxed.push_back(this); |
| 3644 | output_section->convert_input_sections_to_relaxed_sections(new_relaxed); |
| 3645 | } |
| 3646 | |
| 3647 | // Add a plt call stub. |
| 3648 | bool |
| 3649 | add_plt_call_entry(Address, |
| 3650 | const Sized_relobj_file<size, big_endian>*, |
| 3651 | const Symbol*, |
| 3652 | unsigned int, |
| 3653 | Address); |
| 3654 | |
| 3655 | bool |
| 3656 | add_plt_call_entry(Address, |
| 3657 | const Sized_relobj_file<size, big_endian>*, |
| 3658 | unsigned int, |
| 3659 | unsigned int, |
| 3660 | Address); |
| 3661 | |
| 3662 | // Find a given plt call stub. |
| 3663 | Address |
| 3664 | find_plt_call_entry(const Symbol*) const; |
| 3665 | |
| 3666 | Address |
| 3667 | find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, |
| 3668 | unsigned int) const; |
| 3669 | |
| 3670 | Address |
| 3671 | find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, |
| 3672 | const Symbol*, |
| 3673 | unsigned int, |
| 3674 | Address) const; |
| 3675 | |
| 3676 | Address |
| 3677 | find_plt_call_entry(const Sized_relobj_file<size, big_endian>*, |
| 3678 | unsigned int, |
| 3679 | unsigned int, |
| 3680 | Address) const; |
| 3681 | |
| 3682 | // Add a long branch stub. |
| 3683 | bool |
| 3684 | add_long_branch_entry(const Powerpc_relobj<size, big_endian>*, |
| 3685 | unsigned int, Address, Address, bool); |
| 3686 | |
| 3687 | Address |
| 3688 | find_long_branch_entry(const Powerpc_relobj<size, big_endian>*, |
| 3689 | Address) const; |
| 3690 | |
| 3691 | bool |
| 3692 | can_reach_stub(Address from, unsigned int off, unsigned int r_type) |
| 3693 | { |
| 3694 | Address max_branch_offset = max_branch_delta(r_type); |
| 3695 | if (max_branch_offset == 0) |
| 3696 | return true; |
| 3697 | gold_assert(from != invalid_address); |
| 3698 | Address loc = off + this->stub_address(); |
| 3699 | return loc - from + max_branch_offset < 2 * max_branch_offset; |
| 3700 | } |
| 3701 | |
| 3702 | void |
| 3703 | clear_stubs(bool all) |
| 3704 | { |
| 3705 | this->plt_call_stubs_.clear(); |
| 3706 | this->plt_size_ = 0; |
| 3707 | this->long_branch_stubs_.clear(); |
| 3708 | this->branch_size_ = 0; |
| 3709 | this->need_save_res_ = false; |
| 3710 | if (all) |
| 3711 | { |
| 3712 | this->last_plt_size_ = 0; |
| 3713 | this->last_branch_size_ = 0; |
| 3714 | } |
| 3715 | } |
| 3716 | |
| 3717 | Address |
| 3718 | set_address_and_size(const Output_section* os, Address off) |
| 3719 | { |
| 3720 | Address start_off = off; |
| 3721 | off += this->orig_data_size_; |
| 3722 | Address my_size = this->plt_size_ + this->branch_size_; |
| 3723 | if (this->need_save_res_) |
| 3724 | my_size += this->targ_->savres_section()->data_size(); |
| 3725 | if (my_size != 0) |
| 3726 | off = align_address(off, this->stub_align()); |
| 3727 | // Include original section size and alignment padding in size |
| 3728 | my_size += off - start_off; |
| 3729 | this->reset_address_and_file_offset(); |
| 3730 | this->set_current_data_size(my_size); |
| 3731 | this->set_address_and_file_offset(os->address() + start_off, |
| 3732 | os->offset() + start_off); |
| 3733 | return my_size; |
| 3734 | } |
| 3735 | |
| 3736 | Address |
| 3737 | stub_address() const |
| 3738 | { |
| 3739 | return align_address(this->address() + this->orig_data_size_, |
| 3740 | this->stub_align()); |
| 3741 | } |
| 3742 | |
| 3743 | Address |
| 3744 | stub_offset() const |
| 3745 | { |
| 3746 | return align_address(this->offset() + this->orig_data_size_, |
| 3747 | this->stub_align()); |
| 3748 | } |
| 3749 | |
| 3750 | section_size_type |
| 3751 | plt_size() const |
| 3752 | { return this->plt_size_; } |
| 3753 | |
| 3754 | bool |
| 3755 | size_update() |
| 3756 | { |
| 3757 | Output_section* os = this->output_section(); |
| 3758 | if (os->addralign() < this->stub_align()) |
| 3759 | { |
| 3760 | os->set_addralign(this->stub_align()); |
| 3761 | // FIXME: get rid of the insane checkpointing. |
| 3762 | // We can't increase alignment of the input section to which |
| 3763 | // stubs are attached; The input section may be .init which |
| 3764 | // is pasted together with other .init sections to form a |
| 3765 | // function. Aligning might insert zero padding resulting in |
| 3766 | // sigill. However we do need to increase alignment of the |
| 3767 | // output section so that the align_address() on offset in |
| 3768 | // set_address_and_size() adds the same padding as the |
| 3769 | // align_address() on address in stub_address(). |
| 3770 | // What's more, we need this alignment for the layout done in |
| 3771 | // relaxation_loop_body() so that the output section starts at |
| 3772 | // a suitably aligned address. |
| 3773 | os->checkpoint_set_addralign(this->stub_align()); |
| 3774 | } |
| 3775 | if (this->last_plt_size_ != this->plt_size_ |
| 3776 | || this->last_branch_size_ != this->branch_size_) |
| 3777 | { |
| 3778 | this->last_plt_size_ = this->plt_size_; |
| 3779 | this->last_branch_size_ = this->branch_size_; |
| 3780 | return true; |
| 3781 | } |
| 3782 | return false; |
| 3783 | } |
| 3784 | |
| 3785 | // Add .eh_frame info for this stub section. Unlike other linker |
| 3786 | // generated .eh_frame this is added late in the link, because we |
| 3787 | // only want the .eh_frame info if this particular stub section is |
| 3788 | // non-empty. |
| 3789 | void |
| 3790 | add_eh_frame(Layout* layout) |
| 3791 | { |
| 3792 | if (!this->eh_frame_added_) |
| 3793 | { |
| 3794 | if (!parameters->options().ld_generated_unwind_info()) |
| 3795 | return; |
| 3796 | |
| 3797 | // Since we add stub .eh_frame info late, it must be placed |
| 3798 | // after all other linker generated .eh_frame info so that |
| 3799 | // merge mapping need not be updated for input sections. |
| 3800 | // There is no provision to use a different CIE to that used |
| 3801 | // by .glink. |
| 3802 | if (!this->targ_->has_glink()) |
| 3803 | return; |
| 3804 | |
| 3805 | layout->add_eh_frame_for_plt(this, |
| 3806 | Eh_cie<size>::eh_frame_cie, |
| 3807 | sizeof (Eh_cie<size>::eh_frame_cie), |
| 3808 | default_fde, |
| 3809 | sizeof (default_fde)); |
| 3810 | this->eh_frame_added_ = true; |
| 3811 | } |
| 3812 | } |
| 3813 | |
| 3814 | Target_powerpc<size, big_endian>* |
| 3815 | targ() const |
| 3816 | { return targ_; } |
| 3817 | |
| 3818 | private: |
| 3819 | class Plt_stub_ent; |
| 3820 | class Plt_stub_ent_hash; |
| 3821 | typedef Unordered_map<Plt_stub_ent, unsigned int, |
| 3822 | Plt_stub_ent_hash> Plt_stub_entries; |
| 3823 | |
| 3824 | // Alignment of stub section. |
| 3825 | unsigned int |
| 3826 | stub_align() const |
| 3827 | { |
| 3828 | if (size == 32) |
| 3829 | return 16; |
| 3830 | unsigned int min_align = 32; |
| 3831 | unsigned int user_align = 1 << parameters->options().plt_align(); |
| 3832 | return std::max(user_align, min_align); |
| 3833 | } |
| 3834 | |
| 3835 | // Return the plt offset for the given call stub. |
| 3836 | Address |
| 3837 | plt_off(typename Plt_stub_entries::const_iterator p, bool* is_iplt) const |
| 3838 | { |
| 3839 | const Symbol* gsym = p->first.sym_; |
| 3840 | if (gsym != NULL) |
| 3841 | { |
| 3842 | *is_iplt = (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 3843 | && gsym->can_use_relative_reloc(false)); |
| 3844 | return gsym->plt_offset(); |
| 3845 | } |
| 3846 | else |
| 3847 | { |
| 3848 | *is_iplt = true; |
| 3849 | const Sized_relobj_file<size, big_endian>* relobj = p->first.object_; |
| 3850 | unsigned int local_sym_index = p->first.locsym_; |
| 3851 | return relobj->local_plt_offset(local_sym_index); |
| 3852 | } |
| 3853 | } |
| 3854 | |
| 3855 | // Size of a given plt call stub. |
| 3856 | unsigned int |
| 3857 | plt_call_size(typename Plt_stub_entries::const_iterator p) const |
| 3858 | { |
| 3859 | if (size == 32) |
| 3860 | return 16; |
| 3861 | |
| 3862 | bool is_iplt; |
| 3863 | Address plt_addr = this->plt_off(p, &is_iplt); |
| 3864 | if (is_iplt) |
| 3865 | plt_addr += this->targ_->iplt_section()->address(); |
| 3866 | else |
| 3867 | plt_addr += this->targ_->plt_section()->address(); |
| 3868 | Address got_addr = this->targ_->got_section()->output_section()->address(); |
| 3869 | const Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 3870 | <const Powerpc_relobj<size, big_endian>*>(p->first.object_); |
| 3871 | got_addr += ppcobj->toc_base_offset(); |
| 3872 | Address off = plt_addr - got_addr; |
| 3873 | unsigned int bytes = 4 * 4 + 4 * (ha(off) != 0); |
| 3874 | if (this->targ_->abiversion() < 2) |
| 3875 | { |
| 3876 | bool static_chain = parameters->options().plt_static_chain(); |
| 3877 | bool thread_safe = this->targ_->plt_thread_safe(); |
| 3878 | bytes += (4 |
| 3879 | + 4 * static_chain |
| 3880 | + 8 * thread_safe |
| 3881 | + 4 * (ha(off + 8 + 8 * static_chain) != ha(off))); |
| 3882 | } |
| 3883 | unsigned int align = 1 << parameters->options().plt_align(); |
| 3884 | if (align > 1) |
| 3885 | bytes = (bytes + align - 1) & -align; |
| 3886 | return bytes; |
| 3887 | } |
| 3888 | |
| 3889 | // Return long branch stub size. |
| 3890 | unsigned int |
| 3891 | branch_stub_size(Address to) |
| 3892 | { |
| 3893 | Address loc |
| 3894 | = this->stub_address() + this->last_plt_size_ + this->branch_size_; |
| 3895 | if (to - loc + (1 << 25) < 2 << 25) |
| 3896 | return 4; |
| 3897 | if (size == 64 || !parameters->options().output_is_position_independent()) |
| 3898 | return 16; |
| 3899 | return 32; |
| 3900 | } |
| 3901 | |
| 3902 | // Write out stubs. |
| 3903 | void |
| 3904 | do_write(Output_file*); |
| 3905 | |
| 3906 | // Plt call stub keys. |
| 3907 | class Plt_stub_ent |
| 3908 | { |
| 3909 | public: |
| 3910 | Plt_stub_ent(const Symbol* sym) |
| 3911 | : sym_(sym), object_(0), addend_(0), locsym_(0) |
| 3912 | { } |
| 3913 | |
| 3914 | Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object, |
| 3915 | unsigned int locsym_index) |
| 3916 | : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) |
| 3917 | { } |
| 3918 | |
| 3919 | Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object, |
| 3920 | const Symbol* sym, |
| 3921 | unsigned int r_type, |
| 3922 | Address addend) |
| 3923 | : sym_(sym), object_(0), addend_(0), locsym_(0) |
| 3924 | { |
| 3925 | if (size != 32) |
| 3926 | this->addend_ = addend; |
| 3927 | else if (parameters->options().output_is_position_independent() |
| 3928 | && r_type == elfcpp::R_PPC_PLTREL24) |
| 3929 | { |
| 3930 | this->addend_ = addend; |
| 3931 | if (this->addend_ >= 32768) |
| 3932 | this->object_ = object; |
| 3933 | } |
| 3934 | } |
| 3935 | |
| 3936 | Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object, |
| 3937 | unsigned int locsym_index, |
| 3938 | unsigned int r_type, |
| 3939 | Address addend) |
| 3940 | : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index) |
| 3941 | { |
| 3942 | if (size != 32) |
| 3943 | this->addend_ = addend; |
| 3944 | else if (parameters->options().output_is_position_independent() |
| 3945 | && r_type == elfcpp::R_PPC_PLTREL24) |
| 3946 | this->addend_ = addend; |
| 3947 | } |
| 3948 | |
| 3949 | bool operator==(const Plt_stub_ent& that) const |
| 3950 | { |
| 3951 | return (this->sym_ == that.sym_ |
| 3952 | && this->object_ == that.object_ |
| 3953 | && this->addend_ == that.addend_ |
| 3954 | && this->locsym_ == that.locsym_); |
| 3955 | } |
| 3956 | |
| 3957 | const Symbol* sym_; |
| 3958 | const Sized_relobj_file<size, big_endian>* object_; |
| 3959 | typename elfcpp::Elf_types<size>::Elf_Addr addend_; |
| 3960 | unsigned int locsym_; |
| 3961 | }; |
| 3962 | |
| 3963 | class Plt_stub_ent_hash |
| 3964 | { |
| 3965 | public: |
| 3966 | size_t operator()(const Plt_stub_ent& ent) const |
| 3967 | { |
| 3968 | return (reinterpret_cast<uintptr_t>(ent.sym_) |
| 3969 | ^ reinterpret_cast<uintptr_t>(ent.object_) |
| 3970 | ^ ent.addend_ |
| 3971 | ^ ent.locsym_); |
| 3972 | } |
| 3973 | }; |
| 3974 | |
| 3975 | // Long branch stub keys. |
| 3976 | class Branch_stub_ent |
| 3977 | { |
| 3978 | public: |
| 3979 | Branch_stub_ent(const Powerpc_relobj<size, big_endian>* obj, |
| 3980 | Address to, bool save_res) |
| 3981 | : dest_(to), toc_base_off_(0), save_res_(save_res) |
| 3982 | { |
| 3983 | if (size == 64) |
| 3984 | toc_base_off_ = obj->toc_base_offset(); |
| 3985 | } |
| 3986 | |
| 3987 | bool operator==(const Branch_stub_ent& that) const |
| 3988 | { |
| 3989 | return (this->dest_ == that.dest_ |
| 3990 | && (size == 32 |
| 3991 | || this->toc_base_off_ == that.toc_base_off_)); |
| 3992 | } |
| 3993 | |
| 3994 | Address dest_; |
| 3995 | unsigned int toc_base_off_; |
| 3996 | bool save_res_; |
| 3997 | }; |
| 3998 | |
| 3999 | class Branch_stub_ent_hash |
| 4000 | { |
| 4001 | public: |
| 4002 | size_t operator()(const Branch_stub_ent& ent) const |
| 4003 | { return ent.dest_ ^ ent.toc_base_off_; } |
| 4004 | }; |
| 4005 | |
| 4006 | // In a sane world this would be a global. |
| 4007 | Target_powerpc<size, big_endian>* targ_; |
| 4008 | // Map sym/object/addend to stub offset. |
| 4009 | Plt_stub_entries plt_call_stubs_; |
| 4010 | // Map destination address to stub offset. |
| 4011 | typedef Unordered_map<Branch_stub_ent, unsigned int, |
| 4012 | Branch_stub_ent_hash> Branch_stub_entries; |
| 4013 | Branch_stub_entries long_branch_stubs_; |
| 4014 | // size of input section |
| 4015 | section_size_type orig_data_size_; |
| 4016 | // size of stubs |
| 4017 | section_size_type plt_size_, last_plt_size_, branch_size_, last_branch_size_; |
| 4018 | // Whether .eh_frame info has been created for this stub section. |
| 4019 | bool eh_frame_added_; |
| 4020 | // Set if this stub group needs a copy of out-of-line register |
| 4021 | // save/restore functions. |
| 4022 | bool need_save_res_; |
| 4023 | }; |
| 4024 | |
| 4025 | // Add a plt call stub, if we do not already have one for this |
| 4026 | // sym/object/addend combo. |
| 4027 | |
| 4028 | template<int size, bool big_endian> |
| 4029 | bool |
| 4030 | Stub_table<size, big_endian>::add_plt_call_entry( |
| 4031 | Address from, |
| 4032 | const Sized_relobj_file<size, big_endian>* object, |
| 4033 | const Symbol* gsym, |
| 4034 | unsigned int r_type, |
| 4035 | Address addend) |
| 4036 | { |
| 4037 | Plt_stub_ent ent(object, gsym, r_type, addend); |
| 4038 | unsigned int off = this->plt_size_; |
| 4039 | std::pair<typename Plt_stub_entries::iterator, bool> p |
| 4040 | = this->plt_call_stubs_.insert(std::make_pair(ent, off)); |
| 4041 | if (p.second) |
| 4042 | this->plt_size_ = off + this->plt_call_size(p.first); |
| 4043 | return this->can_reach_stub(from, off, r_type); |
| 4044 | } |
| 4045 | |
| 4046 | template<int size, bool big_endian> |
| 4047 | bool |
| 4048 | Stub_table<size, big_endian>::add_plt_call_entry( |
| 4049 | Address from, |
| 4050 | const Sized_relobj_file<size, big_endian>* object, |
| 4051 | unsigned int locsym_index, |
| 4052 | unsigned int r_type, |
| 4053 | Address addend) |
| 4054 | { |
| 4055 | Plt_stub_ent ent(object, locsym_index, r_type, addend); |
| 4056 | unsigned int off = this->plt_size_; |
| 4057 | std::pair<typename Plt_stub_entries::iterator, bool> p |
| 4058 | = this->plt_call_stubs_.insert(std::make_pair(ent, off)); |
| 4059 | if (p.second) |
| 4060 | this->plt_size_ = off + this->plt_call_size(p.first); |
| 4061 | return this->can_reach_stub(from, off, r_type); |
| 4062 | } |
| 4063 | |
| 4064 | // Find a plt call stub. |
| 4065 | |
| 4066 | template<int size, bool big_endian> |
| 4067 | typename Stub_table<size, big_endian>::Address |
| 4068 | Stub_table<size, big_endian>::find_plt_call_entry( |
| 4069 | const Sized_relobj_file<size, big_endian>* object, |
| 4070 | const Symbol* gsym, |
| 4071 | unsigned int r_type, |
| 4072 | Address addend) const |
| 4073 | { |
| 4074 | Plt_stub_ent ent(object, gsym, r_type, addend); |
| 4075 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); |
| 4076 | return p == this->plt_call_stubs_.end() ? invalid_address : p->second; |
| 4077 | } |
| 4078 | |
| 4079 | template<int size, bool big_endian> |
| 4080 | typename Stub_table<size, big_endian>::Address |
| 4081 | Stub_table<size, big_endian>::find_plt_call_entry(const Symbol* gsym) const |
| 4082 | { |
| 4083 | Plt_stub_ent ent(gsym); |
| 4084 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); |
| 4085 | return p == this->plt_call_stubs_.end() ? invalid_address : p->second; |
| 4086 | } |
| 4087 | |
| 4088 | template<int size, bool big_endian> |
| 4089 | typename Stub_table<size, big_endian>::Address |
| 4090 | Stub_table<size, big_endian>::find_plt_call_entry( |
| 4091 | const Sized_relobj_file<size, big_endian>* object, |
| 4092 | unsigned int locsym_index, |
| 4093 | unsigned int r_type, |
| 4094 | Address addend) const |
| 4095 | { |
| 4096 | Plt_stub_ent ent(object, locsym_index, r_type, addend); |
| 4097 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); |
| 4098 | return p == this->plt_call_stubs_.end() ? invalid_address : p->second; |
| 4099 | } |
| 4100 | |
| 4101 | template<int size, bool big_endian> |
| 4102 | typename Stub_table<size, big_endian>::Address |
| 4103 | Stub_table<size, big_endian>::find_plt_call_entry( |
| 4104 | const Sized_relobj_file<size, big_endian>* object, |
| 4105 | unsigned int locsym_index) const |
| 4106 | { |
| 4107 | Plt_stub_ent ent(object, locsym_index); |
| 4108 | typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent); |
| 4109 | return p == this->plt_call_stubs_.end() ? invalid_address : p->second; |
| 4110 | } |
| 4111 | |
| 4112 | // Add a long branch stub if we don't already have one to given |
| 4113 | // destination. |
| 4114 | |
| 4115 | template<int size, bool big_endian> |
| 4116 | bool |
| 4117 | Stub_table<size, big_endian>::add_long_branch_entry( |
| 4118 | const Powerpc_relobj<size, big_endian>* object, |
| 4119 | unsigned int r_type, |
| 4120 | Address from, |
| 4121 | Address to, |
| 4122 | bool save_res) |
| 4123 | { |
| 4124 | Branch_stub_ent ent(object, to, save_res); |
| 4125 | Address off = this->branch_size_; |
| 4126 | if (this->long_branch_stubs_.insert(std::make_pair(ent, off)).second) |
| 4127 | { |
| 4128 | if (save_res) |
| 4129 | this->need_save_res_ = true; |
| 4130 | else |
| 4131 | { |
| 4132 | unsigned int stub_size = this->branch_stub_size(to); |
| 4133 | this->branch_size_ = off + stub_size; |
| 4134 | if (size == 64 && stub_size != 4) |
| 4135 | this->targ_->add_branch_lookup_table(to); |
| 4136 | } |
| 4137 | } |
| 4138 | return this->can_reach_stub(from, off, r_type); |
| 4139 | } |
| 4140 | |
| 4141 | // Find long branch stub offset. |
| 4142 | |
| 4143 | template<int size, bool big_endian> |
| 4144 | typename Stub_table<size, big_endian>::Address |
| 4145 | Stub_table<size, big_endian>::find_long_branch_entry( |
| 4146 | const Powerpc_relobj<size, big_endian>* object, |
| 4147 | Address to) const |
| 4148 | { |
| 4149 | Branch_stub_ent ent(object, to, false); |
| 4150 | typename Branch_stub_entries::const_iterator p |
| 4151 | = this->long_branch_stubs_.find(ent); |
| 4152 | if (p == this->long_branch_stubs_.end()) |
| 4153 | return invalid_address; |
| 4154 | if (p->first.save_res_) |
| 4155 | return to - this->targ_->savres_section()->address() + this->branch_size_; |
| 4156 | return p->second; |
| 4157 | } |
| 4158 | |
| 4159 | // A class to handle .glink. |
| 4160 | |
| 4161 | template<int size, bool big_endian> |
| 4162 | class Output_data_glink : public Output_section_data |
| 4163 | { |
| 4164 | public: |
| 4165 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 4166 | static const Address invalid_address = static_cast<Address>(0) - 1; |
| 4167 | static const int pltresolve_size = 16*4; |
| 4168 | |
| 4169 | Output_data_glink(Target_powerpc<size, big_endian>* targ) |
| 4170 | : Output_section_data(16), targ_(targ), global_entry_stubs_(), |
| 4171 | end_branch_table_(), ge_size_(0) |
| 4172 | { } |
| 4173 | |
| 4174 | void |
| 4175 | add_eh_frame(Layout* layout); |
| 4176 | |
| 4177 | void |
| 4178 | add_global_entry(const Symbol*); |
| 4179 | |
| 4180 | Address |
| 4181 | find_global_entry(const Symbol*) const; |
| 4182 | |
| 4183 | Address |
| 4184 | global_entry_address() const |
| 4185 | { |
| 4186 | gold_assert(this->is_data_size_valid()); |
| 4187 | unsigned int global_entry_off = (this->end_branch_table_ + 15) & -16; |
| 4188 | return this->address() + global_entry_off; |
| 4189 | } |
| 4190 | |
| 4191 | protected: |
| 4192 | // Write to a map file. |
| 4193 | void |
| 4194 | do_print_to_mapfile(Mapfile* mapfile) const |
| 4195 | { mapfile->print_output_data(this, _("** glink")); } |
| 4196 | |
| 4197 | private: |
| 4198 | void |
| 4199 | set_final_data_size(); |
| 4200 | |
| 4201 | // Write out .glink |
| 4202 | void |
| 4203 | do_write(Output_file*); |
| 4204 | |
| 4205 | // Allows access to .got and .plt for do_write. |
| 4206 | Target_powerpc<size, big_endian>* targ_; |
| 4207 | |
| 4208 | // Map sym to stub offset. |
| 4209 | typedef Unordered_map<const Symbol*, unsigned int> Global_entry_stub_entries; |
| 4210 | Global_entry_stub_entries global_entry_stubs_; |
| 4211 | |
| 4212 | unsigned int end_branch_table_, ge_size_; |
| 4213 | }; |
| 4214 | |
| 4215 | template<int size, bool big_endian> |
| 4216 | void |
| 4217 | Output_data_glink<size, big_endian>::add_eh_frame(Layout* layout) |
| 4218 | { |
| 4219 | if (!parameters->options().ld_generated_unwind_info()) |
| 4220 | return; |
| 4221 | |
| 4222 | if (size == 64) |
| 4223 | { |
| 4224 | if (this->targ_->abiversion() < 2) |
| 4225 | layout->add_eh_frame_for_plt(this, |
| 4226 | Eh_cie<64>::eh_frame_cie, |
| 4227 | sizeof (Eh_cie<64>::eh_frame_cie), |
| 4228 | glink_eh_frame_fde_64v1, |
| 4229 | sizeof (glink_eh_frame_fde_64v1)); |
| 4230 | else |
| 4231 | layout->add_eh_frame_for_plt(this, |
| 4232 | Eh_cie<64>::eh_frame_cie, |
| 4233 | sizeof (Eh_cie<64>::eh_frame_cie), |
| 4234 | glink_eh_frame_fde_64v2, |
| 4235 | sizeof (glink_eh_frame_fde_64v2)); |
| 4236 | } |
| 4237 | else |
| 4238 | { |
| 4239 | // 32-bit .glink can use the default since the CIE return |
| 4240 | // address reg, LR, is valid. |
| 4241 | layout->add_eh_frame_for_plt(this, |
| 4242 | Eh_cie<32>::eh_frame_cie, |
| 4243 | sizeof (Eh_cie<32>::eh_frame_cie), |
| 4244 | default_fde, |
| 4245 | sizeof (default_fde)); |
| 4246 | // Except where LR is used in a PIC __glink_PLTresolve. |
| 4247 | if (parameters->options().output_is_position_independent()) |
| 4248 | layout->add_eh_frame_for_plt(this, |
| 4249 | Eh_cie<32>::eh_frame_cie, |
| 4250 | sizeof (Eh_cie<32>::eh_frame_cie), |
| 4251 | glink_eh_frame_fde_32, |
| 4252 | sizeof (glink_eh_frame_fde_32)); |
| 4253 | } |
| 4254 | } |
| 4255 | |
| 4256 | template<int size, bool big_endian> |
| 4257 | void |
| 4258 | Output_data_glink<size, big_endian>::add_global_entry(const Symbol* gsym) |
| 4259 | { |
| 4260 | std::pair<typename Global_entry_stub_entries::iterator, bool> p |
| 4261 | = this->global_entry_stubs_.insert(std::make_pair(gsym, this->ge_size_)); |
| 4262 | if (p.second) |
| 4263 | this->ge_size_ += 16; |
| 4264 | } |
| 4265 | |
| 4266 | template<int size, bool big_endian> |
| 4267 | typename Output_data_glink<size, big_endian>::Address |
| 4268 | Output_data_glink<size, big_endian>::find_global_entry(const Symbol* gsym) const |
| 4269 | { |
| 4270 | typename Global_entry_stub_entries::const_iterator p |
| 4271 | = this->global_entry_stubs_.find(gsym); |
| 4272 | return p == this->global_entry_stubs_.end() ? invalid_address : p->second; |
| 4273 | } |
| 4274 | |
| 4275 | template<int size, bool big_endian> |
| 4276 | void |
| 4277 | Output_data_glink<size, big_endian>::set_final_data_size() |
| 4278 | { |
| 4279 | unsigned int count = this->targ_->plt_entry_count(); |
| 4280 | section_size_type total = 0; |
| 4281 | |
| 4282 | if (count != 0) |
| 4283 | { |
| 4284 | if (size == 32) |
| 4285 | { |
| 4286 | // space for branch table |
| 4287 | total += 4 * (count - 1); |
| 4288 | |
| 4289 | total += -total & 15; |
| 4290 | total += this->pltresolve_size; |
| 4291 | } |
| 4292 | else |
| 4293 | { |
| 4294 | total += this->pltresolve_size; |
| 4295 | |
| 4296 | // space for branch table |
| 4297 | total += 4 * count; |
| 4298 | if (this->targ_->abiversion() < 2) |
| 4299 | { |
| 4300 | total += 4 * count; |
| 4301 | if (count > 0x8000) |
| 4302 | total += 4 * (count - 0x8000); |
| 4303 | } |
| 4304 | } |
| 4305 | } |
| 4306 | this->end_branch_table_ = total; |
| 4307 | total = (total + 15) & -16; |
| 4308 | total += this->ge_size_; |
| 4309 | |
| 4310 | this->set_data_size(total); |
| 4311 | } |
| 4312 | |
| 4313 | // Write out plt and long branch stub code. |
| 4314 | |
| 4315 | template<int size, bool big_endian> |
| 4316 | void |
| 4317 | Stub_table<size, big_endian>::do_write(Output_file* of) |
| 4318 | { |
| 4319 | if (this->plt_call_stubs_.empty() |
| 4320 | && this->long_branch_stubs_.empty()) |
| 4321 | return; |
| 4322 | |
| 4323 | const section_size_type start_off = this->offset(); |
| 4324 | const section_size_type off = this->stub_offset(); |
| 4325 | const section_size_type oview_size = |
| 4326 | convert_to_section_size_type(this->data_size() - (off - start_off)); |
| 4327 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 4328 | unsigned char* p; |
| 4329 | |
| 4330 | if (size == 64) |
| 4331 | { |
| 4332 | const Output_data_got_powerpc<size, big_endian>* got |
| 4333 | = this->targ_->got_section(); |
| 4334 | Address got_os_addr = got->output_section()->address(); |
| 4335 | |
| 4336 | if (!this->plt_call_stubs_.empty()) |
| 4337 | { |
| 4338 | // The base address of the .plt section. |
| 4339 | Address plt_base = this->targ_->plt_section()->address(); |
| 4340 | Address iplt_base = invalid_address; |
| 4341 | |
| 4342 | // Write out plt call stubs. |
| 4343 | typename Plt_stub_entries::const_iterator cs; |
| 4344 | for (cs = this->plt_call_stubs_.begin(); |
| 4345 | cs != this->plt_call_stubs_.end(); |
| 4346 | ++cs) |
| 4347 | { |
| 4348 | bool is_iplt; |
| 4349 | Address pltoff = this->plt_off(cs, &is_iplt); |
| 4350 | Address plt_addr = pltoff; |
| 4351 | if (is_iplt) |
| 4352 | { |
| 4353 | if (iplt_base == invalid_address) |
| 4354 | iplt_base = this->targ_->iplt_section()->address(); |
| 4355 | plt_addr += iplt_base; |
| 4356 | } |
| 4357 | else |
| 4358 | plt_addr += plt_base; |
| 4359 | const Powerpc_relobj<size, big_endian>* ppcobj = static_cast |
| 4360 | <const Powerpc_relobj<size, big_endian>*>(cs->first.object_); |
| 4361 | Address got_addr = got_os_addr + ppcobj->toc_base_offset(); |
| 4362 | Address off = plt_addr - got_addr; |
| 4363 | |
| 4364 | if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) |
| 4365 | gold_error(_("%s: linkage table error against `%s'"), |
| 4366 | cs->first.object_->name().c_str(), |
| 4367 | cs->first.sym_->demangled_name().c_str()); |
| 4368 | |
| 4369 | bool plt_load_toc = this->targ_->abiversion() < 2; |
| 4370 | bool static_chain |
| 4371 | = plt_load_toc && parameters->options().plt_static_chain(); |
| 4372 | bool thread_safe |
| 4373 | = plt_load_toc && this->targ_->plt_thread_safe(); |
| 4374 | bool use_fake_dep = false; |
| 4375 | Address cmp_branch_off = 0; |
| 4376 | if (thread_safe) |
| 4377 | { |
| 4378 | unsigned int pltindex |
| 4379 | = ((pltoff - this->targ_->first_plt_entry_offset()) |
| 4380 | / this->targ_->plt_entry_size()); |
| 4381 | Address glinkoff |
| 4382 | = (this->targ_->glink_section()->pltresolve_size |
| 4383 | + pltindex * 8); |
| 4384 | if (pltindex > 32768) |
| 4385 | glinkoff += (pltindex - 32768) * 4; |
| 4386 | Address to |
| 4387 | = this->targ_->glink_section()->address() + glinkoff; |
| 4388 | Address from |
| 4389 | = (this->stub_address() + cs->second + 24 |
| 4390 | + 4 * (ha(off) != 0) |
| 4391 | + 4 * (ha(off + 8 + 8 * static_chain) != ha(off)) |
| 4392 | + 4 * static_chain); |
| 4393 | cmp_branch_off = to - from; |
| 4394 | use_fake_dep = cmp_branch_off + (1 << 25) >= (1 << 26); |
| 4395 | } |
| 4396 | |
| 4397 | p = oview + cs->second; |
| 4398 | if (ha(off) != 0) |
| 4399 | { |
| 4400 | write_insn<big_endian>(p, std_2_1 + this->targ_->stk_toc()); |
| 4401 | p += 4; |
| 4402 | if (plt_load_toc) |
| 4403 | { |
| 4404 | write_insn<big_endian>(p, addis_11_2 + ha(off)); |
| 4405 | p += 4; |
| 4406 | write_insn<big_endian>(p, ld_12_11 + l(off)); |
| 4407 | p += 4; |
| 4408 | } |
| 4409 | else |
| 4410 | { |
| 4411 | write_insn<big_endian>(p, addis_12_2 + ha(off)); |
| 4412 | p += 4; |
| 4413 | write_insn<big_endian>(p, ld_12_12 + l(off)); |
| 4414 | p += 4; |
| 4415 | } |
| 4416 | if (plt_load_toc |
| 4417 | && ha(off + 8 + 8 * static_chain) != ha(off)) |
| 4418 | { |
| 4419 | write_insn<big_endian>(p, addi_11_11 + l(off)); |
| 4420 | p += 4; |
| 4421 | off = 0; |
| 4422 | } |
| 4423 | write_insn<big_endian>(p, mtctr_12); |
| 4424 | p += 4; |
| 4425 | if (plt_load_toc) |
| 4426 | { |
| 4427 | if (use_fake_dep) |
| 4428 | { |
| 4429 | write_insn<big_endian>(p, xor_2_12_12); |
| 4430 | p += 4; |
| 4431 | write_insn<big_endian>(p, add_11_11_2); |
| 4432 | p += 4; |
| 4433 | } |
| 4434 | write_insn<big_endian>(p, ld_2_11 + l(off + 8)); |
| 4435 | p += 4; |
| 4436 | if (static_chain) |
| 4437 | { |
| 4438 | write_insn<big_endian>(p, ld_11_11 + l(off + 16)); |
| 4439 | p += 4; |
| 4440 | } |
| 4441 | } |
| 4442 | } |
| 4443 | else |
| 4444 | { |
| 4445 | write_insn<big_endian>(p, std_2_1 + this->targ_->stk_toc()); |
| 4446 | p += 4; |
| 4447 | write_insn<big_endian>(p, ld_12_2 + l(off)); |
| 4448 | p += 4; |
| 4449 | if (plt_load_toc |
| 4450 | && ha(off + 8 + 8 * static_chain) != ha(off)) |
| 4451 | { |
| 4452 | write_insn<big_endian>(p, addi_2_2 + l(off)); |
| 4453 | p += 4; |
| 4454 | off = 0; |
| 4455 | } |
| 4456 | write_insn<big_endian>(p, mtctr_12); |
| 4457 | p += 4; |
| 4458 | if (plt_load_toc) |
| 4459 | { |
| 4460 | if (use_fake_dep) |
| 4461 | { |
| 4462 | write_insn<big_endian>(p, xor_11_12_12); |
| 4463 | p += 4; |
| 4464 | write_insn<big_endian>(p, add_2_2_11); |
| 4465 | p += 4; |
| 4466 | } |
| 4467 | if (static_chain) |
| 4468 | { |
| 4469 | write_insn<big_endian>(p, ld_11_2 + l(off + 16)); |
| 4470 | p += 4; |
| 4471 | } |
| 4472 | write_insn<big_endian>(p, ld_2_2 + l(off + 8)); |
| 4473 | p += 4; |
| 4474 | } |
| 4475 | } |
| 4476 | if (thread_safe && !use_fake_dep) |
| 4477 | { |
| 4478 | write_insn<big_endian>(p, cmpldi_2_0); |
| 4479 | p += 4; |
| 4480 | write_insn<big_endian>(p, bnectr_p4); |
| 4481 | p += 4; |
| 4482 | write_insn<big_endian>(p, b | (cmp_branch_off & 0x3fffffc)); |
| 4483 | } |
| 4484 | else |
| 4485 | write_insn<big_endian>(p, bctr); |
| 4486 | } |
| 4487 | } |
| 4488 | |
| 4489 | // Write out long branch stubs. |
| 4490 | typename Branch_stub_entries::const_iterator bs; |
| 4491 | for (bs = this->long_branch_stubs_.begin(); |
| 4492 | bs != this->long_branch_stubs_.end(); |
| 4493 | ++bs) |
| 4494 | { |
| 4495 | if (bs->first.save_res_) |
| 4496 | continue; |
| 4497 | p = oview + this->plt_size_ + bs->second; |
| 4498 | Address loc = this->stub_address() + this->plt_size_ + bs->second; |
| 4499 | Address delta = bs->first.dest_ - loc; |
| 4500 | if (delta + (1 << 25) < 2 << 25) |
| 4501 | write_insn<big_endian>(p, b | (delta & 0x3fffffc)); |
| 4502 | else |
| 4503 | { |
| 4504 | Address brlt_addr |
| 4505 | = this->targ_->find_branch_lookup_table(bs->first.dest_); |
| 4506 | gold_assert(brlt_addr != invalid_address); |
| 4507 | brlt_addr += this->targ_->brlt_section()->address(); |
| 4508 | Address got_addr = got_os_addr + bs->first.toc_base_off_; |
| 4509 | Address brltoff = brlt_addr - got_addr; |
| 4510 | if (ha(brltoff) == 0) |
| 4511 | { |
| 4512 | write_insn<big_endian>(p, ld_12_2 + l(brltoff)), p += 4; |
| 4513 | } |
| 4514 | else |
| 4515 | { |
| 4516 | write_insn<big_endian>(p, addis_12_2 + ha(brltoff)), p += 4; |
| 4517 | write_insn<big_endian>(p, ld_12_12 + l(brltoff)), p += 4; |
| 4518 | } |
| 4519 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 4520 | write_insn<big_endian>(p, bctr); |
| 4521 | } |
| 4522 | } |
| 4523 | } |
| 4524 | else |
| 4525 | { |
| 4526 | if (!this->plt_call_stubs_.empty()) |
| 4527 | { |
| 4528 | // The base address of the .plt section. |
| 4529 | Address plt_base = this->targ_->plt_section()->address(); |
| 4530 | Address iplt_base = invalid_address; |
| 4531 | // The address of _GLOBAL_OFFSET_TABLE_. |
| 4532 | Address g_o_t = invalid_address; |
| 4533 | |
| 4534 | // Write out plt call stubs. |
| 4535 | typename Plt_stub_entries::const_iterator cs; |
| 4536 | for (cs = this->plt_call_stubs_.begin(); |
| 4537 | cs != this->plt_call_stubs_.end(); |
| 4538 | ++cs) |
| 4539 | { |
| 4540 | bool is_iplt; |
| 4541 | Address plt_addr = this->plt_off(cs, &is_iplt); |
| 4542 | if (is_iplt) |
| 4543 | { |
| 4544 | if (iplt_base == invalid_address) |
| 4545 | iplt_base = this->targ_->iplt_section()->address(); |
| 4546 | plt_addr += iplt_base; |
| 4547 | } |
| 4548 | else |
| 4549 | plt_addr += plt_base; |
| 4550 | |
| 4551 | p = oview + cs->second; |
| 4552 | if (parameters->options().output_is_position_independent()) |
| 4553 | { |
| 4554 | Address got_addr; |
| 4555 | const Powerpc_relobj<size, big_endian>* ppcobj |
| 4556 | = (static_cast<const Powerpc_relobj<size, big_endian>*> |
| 4557 | (cs->first.object_)); |
| 4558 | if (ppcobj != NULL && cs->first.addend_ >= 32768) |
| 4559 | { |
| 4560 | unsigned int got2 = ppcobj->got2_shndx(); |
| 4561 | got_addr = ppcobj->get_output_section_offset(got2); |
| 4562 | gold_assert(got_addr != invalid_address); |
| 4563 | got_addr += (ppcobj->output_section(got2)->address() |
| 4564 | + cs->first.addend_); |
| 4565 | } |
| 4566 | else |
| 4567 | { |
| 4568 | if (g_o_t == invalid_address) |
| 4569 | { |
| 4570 | const Output_data_got_powerpc<size, big_endian>* got |
| 4571 | = this->targ_->got_section(); |
| 4572 | g_o_t = got->address() + got->g_o_t(); |
| 4573 | } |
| 4574 | got_addr = g_o_t; |
| 4575 | } |
| 4576 | |
| 4577 | Address off = plt_addr - got_addr; |
| 4578 | if (ha(off) == 0) |
| 4579 | { |
| 4580 | write_insn<big_endian>(p + 0, lwz_11_30 + l(off)); |
| 4581 | write_insn<big_endian>(p + 4, mtctr_11); |
| 4582 | write_insn<big_endian>(p + 8, bctr); |
| 4583 | } |
| 4584 | else |
| 4585 | { |
| 4586 | write_insn<big_endian>(p + 0, addis_11_30 + ha(off)); |
| 4587 | write_insn<big_endian>(p + 4, lwz_11_11 + l(off)); |
| 4588 | write_insn<big_endian>(p + 8, mtctr_11); |
| 4589 | write_insn<big_endian>(p + 12, bctr); |
| 4590 | } |
| 4591 | } |
| 4592 | else |
| 4593 | { |
| 4594 | write_insn<big_endian>(p + 0, lis_11 + ha(plt_addr)); |
| 4595 | write_insn<big_endian>(p + 4, lwz_11_11 + l(plt_addr)); |
| 4596 | write_insn<big_endian>(p + 8, mtctr_11); |
| 4597 | write_insn<big_endian>(p + 12, bctr); |
| 4598 | } |
| 4599 | } |
| 4600 | } |
| 4601 | |
| 4602 | // Write out long branch stubs. |
| 4603 | typename Branch_stub_entries::const_iterator bs; |
| 4604 | for (bs = this->long_branch_stubs_.begin(); |
| 4605 | bs != this->long_branch_stubs_.end(); |
| 4606 | ++bs) |
| 4607 | { |
| 4608 | if (bs->first.save_res_) |
| 4609 | continue; |
| 4610 | p = oview + this->plt_size_ + bs->second; |
| 4611 | Address loc = this->stub_address() + this->plt_size_ + bs->second; |
| 4612 | Address delta = bs->first.dest_ - loc; |
| 4613 | if (delta + (1 << 25) < 2 << 25) |
| 4614 | write_insn<big_endian>(p, b | (delta & 0x3fffffc)); |
| 4615 | else if (!parameters->options().output_is_position_independent()) |
| 4616 | { |
| 4617 | write_insn<big_endian>(p + 0, lis_12 + ha(bs->first.dest_)); |
| 4618 | write_insn<big_endian>(p + 4, addi_12_12 + l(bs->first.dest_)); |
| 4619 | write_insn<big_endian>(p + 8, mtctr_12); |
| 4620 | write_insn<big_endian>(p + 12, bctr); |
| 4621 | } |
| 4622 | else |
| 4623 | { |
| 4624 | delta -= 8; |
| 4625 | write_insn<big_endian>(p + 0, mflr_0); |
| 4626 | write_insn<big_endian>(p + 4, bcl_20_31); |
| 4627 | write_insn<big_endian>(p + 8, mflr_12); |
| 4628 | write_insn<big_endian>(p + 12, addis_12_12 + ha(delta)); |
| 4629 | write_insn<big_endian>(p + 16, addi_12_12 + l(delta)); |
| 4630 | write_insn<big_endian>(p + 20, mtlr_0); |
| 4631 | write_insn<big_endian>(p + 24, mtctr_12); |
| 4632 | write_insn<big_endian>(p + 28, bctr); |
| 4633 | } |
| 4634 | } |
| 4635 | } |
| 4636 | if (this->need_save_res_) |
| 4637 | { |
| 4638 | p = oview + this->plt_size_ + this->branch_size_; |
| 4639 | memcpy (p, this->targ_->savres_section()->contents(), |
| 4640 | this->targ_->savres_section()->data_size()); |
| 4641 | } |
| 4642 | } |
| 4643 | |
| 4644 | // Write out .glink. |
| 4645 | |
| 4646 | template<int size, bool big_endian> |
| 4647 | void |
| 4648 | Output_data_glink<size, big_endian>::do_write(Output_file* of) |
| 4649 | { |
| 4650 | const section_size_type off = this->offset(); |
| 4651 | const section_size_type oview_size = |
| 4652 | convert_to_section_size_type(this->data_size()); |
| 4653 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 4654 | unsigned char* p; |
| 4655 | |
| 4656 | // The base address of the .plt section. |
| 4657 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 4658 | Address plt_base = this->targ_->plt_section()->address(); |
| 4659 | |
| 4660 | if (size == 64) |
| 4661 | { |
| 4662 | if (this->end_branch_table_ != 0) |
| 4663 | { |
| 4664 | // Write pltresolve stub. |
| 4665 | p = oview; |
| 4666 | Address after_bcl = this->address() + 16; |
| 4667 | Address pltoff = plt_base - after_bcl; |
| 4668 | |
| 4669 | elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8; |
| 4670 | |
| 4671 | if (this->targ_->abiversion() < 2) |
| 4672 | { |
| 4673 | write_insn<big_endian>(p, mflr_12), p += 4; |
| 4674 | write_insn<big_endian>(p, bcl_20_31), p += 4; |
| 4675 | write_insn<big_endian>(p, mflr_11), p += 4; |
| 4676 | write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4; |
| 4677 | write_insn<big_endian>(p, mtlr_12), p += 4; |
| 4678 | write_insn<big_endian>(p, add_11_2_11), p += 4; |
| 4679 | write_insn<big_endian>(p, ld_12_11 + 0), p += 4; |
| 4680 | write_insn<big_endian>(p, ld_2_11 + 8), p += 4; |
| 4681 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 4682 | write_insn<big_endian>(p, ld_11_11 + 16), p += 4; |
| 4683 | } |
| 4684 | else |
| 4685 | { |
| 4686 | write_insn<big_endian>(p, mflr_0), p += 4; |
| 4687 | write_insn<big_endian>(p, bcl_20_31), p += 4; |
| 4688 | write_insn<big_endian>(p, mflr_11), p += 4; |
| 4689 | write_insn<big_endian>(p, ld_2_11 + l(-16)), p += 4; |
| 4690 | write_insn<big_endian>(p, mtlr_0), p += 4; |
| 4691 | write_insn<big_endian>(p, sub_12_12_11), p += 4; |
| 4692 | write_insn<big_endian>(p, add_11_2_11), p += 4; |
| 4693 | write_insn<big_endian>(p, addi_0_12 + l(-48)), p += 4; |
| 4694 | write_insn<big_endian>(p, ld_12_11 + 0), p += 4; |
| 4695 | write_insn<big_endian>(p, srdi_0_0_2), p += 4; |
| 4696 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 4697 | write_insn<big_endian>(p, ld_11_11 + 8), p += 4; |
| 4698 | } |
| 4699 | write_insn<big_endian>(p, bctr), p += 4; |
| 4700 | while (p < oview + this->pltresolve_size) |
| 4701 | write_insn<big_endian>(p, nop), p += 4; |
| 4702 | |
| 4703 | // Write lazy link call stubs. |
| 4704 | uint32_t indx = 0; |
| 4705 | while (p < oview + this->end_branch_table_) |
| 4706 | { |
| 4707 | if (this->targ_->abiversion() < 2) |
| 4708 | { |
| 4709 | if (indx < 0x8000) |
| 4710 | { |
| 4711 | write_insn<big_endian>(p, li_0_0 + indx), p += 4; |
| 4712 | } |
| 4713 | else |
| 4714 | { |
| 4715 | write_insn<big_endian>(p, lis_0 + hi(indx)), p += 4; |
| 4716 | write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4; |
| 4717 | } |
| 4718 | } |
| 4719 | uint32_t branch_off = 8 - (p - oview); |
| 4720 | write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4; |
| 4721 | indx++; |
| 4722 | } |
| 4723 | } |
| 4724 | |
| 4725 | Address plt_base = this->targ_->plt_section()->address(); |
| 4726 | Address iplt_base = invalid_address; |
| 4727 | unsigned int global_entry_off = (this->end_branch_table_ + 15) & -16; |
| 4728 | Address global_entry_base = this->address() + global_entry_off; |
| 4729 | typename Global_entry_stub_entries::const_iterator ge; |
| 4730 | for (ge = this->global_entry_stubs_.begin(); |
| 4731 | ge != this->global_entry_stubs_.end(); |
| 4732 | ++ge) |
| 4733 | { |
| 4734 | p = oview + global_entry_off + ge->second; |
| 4735 | Address plt_addr = ge->first->plt_offset(); |
| 4736 | if (ge->first->type() == elfcpp::STT_GNU_IFUNC |
| 4737 | && ge->first->can_use_relative_reloc(false)) |
| 4738 | { |
| 4739 | if (iplt_base == invalid_address) |
| 4740 | iplt_base = this->targ_->iplt_section()->address(); |
| 4741 | plt_addr += iplt_base; |
| 4742 | } |
| 4743 | else |
| 4744 | plt_addr += plt_base; |
| 4745 | Address my_addr = global_entry_base + ge->second; |
| 4746 | Address off = plt_addr - my_addr; |
| 4747 | |
| 4748 | if (off + 0x80008000 > 0xffffffff || (off & 3) != 0) |
| 4749 | gold_error(_("%s: linkage table error against `%s'"), |
| 4750 | ge->first->object()->name().c_str(), |
| 4751 | ge->first->demangled_name().c_str()); |
| 4752 | |
| 4753 | write_insn<big_endian>(p, addis_12_12 + ha(off)), p += 4; |
| 4754 | write_insn<big_endian>(p, ld_12_12 + l(off)), p += 4; |
| 4755 | write_insn<big_endian>(p, mtctr_12), p += 4; |
| 4756 | write_insn<big_endian>(p, bctr); |
| 4757 | } |
| 4758 | } |
| 4759 | else |
| 4760 | { |
| 4761 | const Output_data_got_powerpc<size, big_endian>* got |
| 4762 | = this->targ_->got_section(); |
| 4763 | // The address of _GLOBAL_OFFSET_TABLE_. |
| 4764 | Address g_o_t = got->address() + got->g_o_t(); |
| 4765 | |
| 4766 | // Write out pltresolve branch table. |
| 4767 | p = oview; |
| 4768 | unsigned int the_end = oview_size - this->pltresolve_size; |
| 4769 | unsigned char* end_p = oview + the_end; |
| 4770 | while (p < end_p - 8 * 4) |
| 4771 | write_insn<big_endian>(p, b + end_p - p), p += 4; |
| 4772 | while (p < end_p) |
| 4773 | write_insn<big_endian>(p, nop), p += 4; |
| 4774 | |
| 4775 | // Write out pltresolve call stub. |
| 4776 | if (parameters->options().output_is_position_independent()) |
| 4777 | { |
| 4778 | Address res0_off = 0; |
| 4779 | Address after_bcl_off = the_end + 12; |
| 4780 | Address bcl_res0 = after_bcl_off - res0_off; |
| 4781 | |
| 4782 | write_insn<big_endian>(p + 0, addis_11_11 + ha(bcl_res0)); |
| 4783 | write_insn<big_endian>(p + 4, mflr_0); |
| 4784 | write_insn<big_endian>(p + 8, bcl_20_31); |
| 4785 | write_insn<big_endian>(p + 12, addi_11_11 + l(bcl_res0)); |
| 4786 | write_insn<big_endian>(p + 16, mflr_12); |
| 4787 | write_insn<big_endian>(p + 20, mtlr_0); |
| 4788 | write_insn<big_endian>(p + 24, sub_11_11_12); |
| 4789 | |
| 4790 | Address got_bcl = g_o_t + 4 - (after_bcl_off + this->address()); |
| 4791 | |
| 4792 | write_insn<big_endian>(p + 28, addis_12_12 + ha(got_bcl)); |
| 4793 | if (ha(got_bcl) == ha(got_bcl + 4)) |
| 4794 | { |
| 4795 | write_insn<big_endian>(p + 32, lwz_0_12 + l(got_bcl)); |
| 4796 | write_insn<big_endian>(p + 36, lwz_12_12 + l(got_bcl + 4)); |
| 4797 | } |
| 4798 | else |
| 4799 | { |
| 4800 | write_insn<big_endian>(p + 32, lwzu_0_12 + l(got_bcl)); |
| 4801 | write_insn<big_endian>(p + 36, lwz_12_12 + 4); |
| 4802 | } |
| 4803 | write_insn<big_endian>(p + 40, mtctr_0); |
| 4804 | write_insn<big_endian>(p + 44, add_0_11_11); |
| 4805 | write_insn<big_endian>(p + 48, add_11_0_11); |
| 4806 | write_insn<big_endian>(p + 52, bctr); |
| 4807 | write_insn<big_endian>(p + 56, nop); |
| 4808 | write_insn<big_endian>(p + 60, nop); |
| 4809 | } |
| 4810 | else |
| 4811 | { |
| 4812 | Address res0 = this->address(); |
| 4813 | |
| 4814 | write_insn<big_endian>(p + 0, lis_12 + ha(g_o_t + 4)); |
| 4815 | write_insn<big_endian>(p + 4, addis_11_11 + ha(-res0)); |
| 4816 | if (ha(g_o_t + 4) == ha(g_o_t + 8)) |
| 4817 | write_insn<big_endian>(p + 8, lwz_0_12 + l(g_o_t + 4)); |
| 4818 | else |
| 4819 | write_insn<big_endian>(p + 8, lwzu_0_12 + l(g_o_t + 4)); |
| 4820 | write_insn<big_endian>(p + 12, addi_11_11 + l(-res0)); |
| 4821 | write_insn<big_endian>(p + 16, mtctr_0); |
| 4822 | write_insn<big_endian>(p + 20, add_0_11_11); |
| 4823 | if (ha(g_o_t + 4) == ha(g_o_t + 8)) |
| 4824 | write_insn<big_endian>(p + 24, lwz_12_12 + l(g_o_t + 8)); |
| 4825 | else |
| 4826 | write_insn<big_endian>(p + 24, lwz_12_12 + 4); |
| 4827 | write_insn<big_endian>(p + 28, add_11_0_11); |
| 4828 | write_insn<big_endian>(p + 32, bctr); |
| 4829 | write_insn<big_endian>(p + 36, nop); |
| 4830 | write_insn<big_endian>(p + 40, nop); |
| 4831 | write_insn<big_endian>(p + 44, nop); |
| 4832 | write_insn<big_endian>(p + 48, nop); |
| 4833 | write_insn<big_endian>(p + 52, nop); |
| 4834 | write_insn<big_endian>(p + 56, nop); |
| 4835 | write_insn<big_endian>(p + 60, nop); |
| 4836 | } |
| 4837 | p += 64; |
| 4838 | } |
| 4839 | |
| 4840 | of->write_output_view(off, oview_size, oview); |
| 4841 | } |
| 4842 | |
| 4843 | |
| 4844 | // A class to handle linker generated save/restore functions. |
| 4845 | |
| 4846 | template<int size, bool big_endian> |
| 4847 | class Output_data_save_res : public Output_section_data_build |
| 4848 | { |
| 4849 | public: |
| 4850 | Output_data_save_res(Symbol_table* symtab); |
| 4851 | |
| 4852 | const unsigned char* |
| 4853 | contents() const |
| 4854 | { |
| 4855 | return contents_; |
| 4856 | } |
| 4857 | |
| 4858 | protected: |
| 4859 | // Write to a map file. |
| 4860 | void |
| 4861 | do_print_to_mapfile(Mapfile* mapfile) const |
| 4862 | { mapfile->print_output_data(this, _("** save/restore")); } |
| 4863 | |
| 4864 | void |
| 4865 | do_write(Output_file*); |
| 4866 | |
| 4867 | private: |
| 4868 | // The maximum size of save/restore contents. |
| 4869 | static const unsigned int savres_max = 218*4; |
| 4870 | |
| 4871 | void |
| 4872 | savres_define(Symbol_table* symtab, |
| 4873 | const char *name, |
| 4874 | unsigned int lo, unsigned int hi, |
| 4875 | unsigned char* write_ent(unsigned char*, int), |
| 4876 | unsigned char* write_tail(unsigned char*, int)); |
| 4877 | |
| 4878 | unsigned char *contents_; |
| 4879 | }; |
| 4880 | |
| 4881 | template<bool big_endian> |
| 4882 | static unsigned char* |
| 4883 | savegpr0(unsigned char* p, int r) |
| 4884 | { |
| 4885 | uint32_t insn = std_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 4886 | write_insn<big_endian>(p, insn); |
| 4887 | return p + 4; |
| 4888 | } |
| 4889 | |
| 4890 | template<bool big_endian> |
| 4891 | static unsigned char* |
| 4892 | savegpr0_tail(unsigned char* p, int r) |
| 4893 | { |
| 4894 | p = savegpr0<big_endian>(p, r); |
| 4895 | uint32_t insn = std_0_1 + 16; |
| 4896 | write_insn<big_endian>(p, insn); |
| 4897 | p = p + 4; |
| 4898 | write_insn<big_endian>(p, blr); |
| 4899 | return p + 4; |
| 4900 | } |
| 4901 | |
| 4902 | template<bool big_endian> |
| 4903 | static unsigned char* |
| 4904 | restgpr0(unsigned char* p, int r) |
| 4905 | { |
| 4906 | uint32_t insn = ld_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 4907 | write_insn<big_endian>(p, insn); |
| 4908 | return p + 4; |
| 4909 | } |
| 4910 | |
| 4911 | template<bool big_endian> |
| 4912 | static unsigned char* |
| 4913 | restgpr0_tail(unsigned char* p, int r) |
| 4914 | { |
| 4915 | uint32_t insn = ld_0_1 + 16; |
| 4916 | write_insn<big_endian>(p, insn); |
| 4917 | p = p + 4; |
| 4918 | p = restgpr0<big_endian>(p, r); |
| 4919 | write_insn<big_endian>(p, mtlr_0); |
| 4920 | p = p + 4; |
| 4921 | if (r == 29) |
| 4922 | { |
| 4923 | p = restgpr0<big_endian>(p, 30); |
| 4924 | p = restgpr0<big_endian>(p, 31); |
| 4925 | } |
| 4926 | write_insn<big_endian>(p, blr); |
| 4927 | return p + 4; |
| 4928 | } |
| 4929 | |
| 4930 | template<bool big_endian> |
| 4931 | static unsigned char* |
| 4932 | savegpr1(unsigned char* p, int r) |
| 4933 | { |
| 4934 | uint32_t insn = std_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 4935 | write_insn<big_endian>(p, insn); |
| 4936 | return p + 4; |
| 4937 | } |
| 4938 | |
| 4939 | template<bool big_endian> |
| 4940 | static unsigned char* |
| 4941 | savegpr1_tail(unsigned char* p, int r) |
| 4942 | { |
| 4943 | p = savegpr1<big_endian>(p, r); |
| 4944 | write_insn<big_endian>(p, blr); |
| 4945 | return p + 4; |
| 4946 | } |
| 4947 | |
| 4948 | template<bool big_endian> |
| 4949 | static unsigned char* |
| 4950 | restgpr1(unsigned char* p, int r) |
| 4951 | { |
| 4952 | uint32_t insn = ld_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 4953 | write_insn<big_endian>(p, insn); |
| 4954 | return p + 4; |
| 4955 | } |
| 4956 | |
| 4957 | template<bool big_endian> |
| 4958 | static unsigned char* |
| 4959 | restgpr1_tail(unsigned char* p, int r) |
| 4960 | { |
| 4961 | p = restgpr1<big_endian>(p, r); |
| 4962 | write_insn<big_endian>(p, blr); |
| 4963 | return p + 4; |
| 4964 | } |
| 4965 | |
| 4966 | template<bool big_endian> |
| 4967 | static unsigned char* |
| 4968 | savefpr(unsigned char* p, int r) |
| 4969 | { |
| 4970 | uint32_t insn = stfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 4971 | write_insn<big_endian>(p, insn); |
| 4972 | return p + 4; |
| 4973 | } |
| 4974 | |
| 4975 | template<bool big_endian> |
| 4976 | static unsigned char* |
| 4977 | savefpr0_tail(unsigned char* p, int r) |
| 4978 | { |
| 4979 | p = savefpr<big_endian>(p, r); |
| 4980 | write_insn<big_endian>(p, std_0_1 + 16); |
| 4981 | p = p + 4; |
| 4982 | write_insn<big_endian>(p, blr); |
| 4983 | return p + 4; |
| 4984 | } |
| 4985 | |
| 4986 | template<bool big_endian> |
| 4987 | static unsigned char* |
| 4988 | restfpr(unsigned char* p, int r) |
| 4989 | { |
| 4990 | uint32_t insn = lfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8; |
| 4991 | write_insn<big_endian>(p, insn); |
| 4992 | return p + 4; |
| 4993 | } |
| 4994 | |
| 4995 | template<bool big_endian> |
| 4996 | static unsigned char* |
| 4997 | restfpr0_tail(unsigned char* p, int r) |
| 4998 | { |
| 4999 | write_insn<big_endian>(p, ld_0_1 + 16); |
| 5000 | p = p + 4; |
| 5001 | p = restfpr<big_endian>(p, r); |
| 5002 | write_insn<big_endian>(p, mtlr_0); |
| 5003 | p = p + 4; |
| 5004 | if (r == 29) |
| 5005 | { |
| 5006 | p = restfpr<big_endian>(p, 30); |
| 5007 | p = restfpr<big_endian>(p, 31); |
| 5008 | } |
| 5009 | write_insn<big_endian>(p, blr); |
| 5010 | return p + 4; |
| 5011 | } |
| 5012 | |
| 5013 | template<bool big_endian> |
| 5014 | static unsigned char* |
| 5015 | savefpr1_tail(unsigned char* p, int r) |
| 5016 | { |
| 5017 | p = savefpr<big_endian>(p, r); |
| 5018 | write_insn<big_endian>(p, blr); |
| 5019 | return p + 4; |
| 5020 | } |
| 5021 | |
| 5022 | template<bool big_endian> |
| 5023 | static unsigned char* |
| 5024 | restfpr1_tail(unsigned char* p, int r) |
| 5025 | { |
| 5026 | p = restfpr<big_endian>(p, r); |
| 5027 | write_insn<big_endian>(p, blr); |
| 5028 | return p + 4; |
| 5029 | } |
| 5030 | |
| 5031 | template<bool big_endian> |
| 5032 | static unsigned char* |
| 5033 | savevr(unsigned char* p, int r) |
| 5034 | { |
| 5035 | uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; |
| 5036 | write_insn<big_endian>(p, insn); |
| 5037 | p = p + 4; |
| 5038 | insn = stvx_0_12_0 + (r << 21); |
| 5039 | write_insn<big_endian>(p, insn); |
| 5040 | return p + 4; |
| 5041 | } |
| 5042 | |
| 5043 | template<bool big_endian> |
| 5044 | static unsigned char* |
| 5045 | savevr_tail(unsigned char* p, int r) |
| 5046 | { |
| 5047 | p = savevr<big_endian>(p, r); |
| 5048 | write_insn<big_endian>(p, blr); |
| 5049 | return p + 4; |
| 5050 | } |
| 5051 | |
| 5052 | template<bool big_endian> |
| 5053 | static unsigned char* |
| 5054 | restvr(unsigned char* p, int r) |
| 5055 | { |
| 5056 | uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16; |
| 5057 | write_insn<big_endian>(p, insn); |
| 5058 | p = p + 4; |
| 5059 | insn = lvx_0_12_0 + (r << 21); |
| 5060 | write_insn<big_endian>(p, insn); |
| 5061 | return p + 4; |
| 5062 | } |
| 5063 | |
| 5064 | template<bool big_endian> |
| 5065 | static unsigned char* |
| 5066 | restvr_tail(unsigned char* p, int r) |
| 5067 | { |
| 5068 | p = restvr<big_endian>(p, r); |
| 5069 | write_insn<big_endian>(p, blr); |
| 5070 | return p + 4; |
| 5071 | } |
| 5072 | |
| 5073 | |
| 5074 | template<int size, bool big_endian> |
| 5075 | Output_data_save_res<size, big_endian>::Output_data_save_res( |
| 5076 | Symbol_table* symtab) |
| 5077 | : Output_section_data_build(4), |
| 5078 | contents_(NULL) |
| 5079 | { |
| 5080 | this->savres_define(symtab, |
| 5081 | "_savegpr0_", 14, 31, |
| 5082 | savegpr0<big_endian>, savegpr0_tail<big_endian>); |
| 5083 | this->savres_define(symtab, |
| 5084 | "_restgpr0_", 14, 29, |
| 5085 | restgpr0<big_endian>, restgpr0_tail<big_endian>); |
| 5086 | this->savres_define(symtab, |
| 5087 | "_restgpr0_", 30, 31, |
| 5088 | restgpr0<big_endian>, restgpr0_tail<big_endian>); |
| 5089 | this->savres_define(symtab, |
| 5090 | "_savegpr1_", 14, 31, |
| 5091 | savegpr1<big_endian>, savegpr1_tail<big_endian>); |
| 5092 | this->savres_define(symtab, |
| 5093 | "_restgpr1_", 14, 31, |
| 5094 | restgpr1<big_endian>, restgpr1_tail<big_endian>); |
| 5095 | this->savres_define(symtab, |
| 5096 | "_savefpr_", 14, 31, |
| 5097 | savefpr<big_endian>, savefpr0_tail<big_endian>); |
| 5098 | this->savres_define(symtab, |
| 5099 | "_restfpr_", 14, 29, |
| 5100 | restfpr<big_endian>, restfpr0_tail<big_endian>); |
| 5101 | this->savres_define(symtab, |
| 5102 | "_restfpr_", 30, 31, |
| 5103 | restfpr<big_endian>, restfpr0_tail<big_endian>); |
| 5104 | this->savres_define(symtab, |
| 5105 | "._savef", 14, 31, |
| 5106 | savefpr<big_endian>, savefpr1_tail<big_endian>); |
| 5107 | this->savres_define(symtab, |
| 5108 | "._restf", 14, 31, |
| 5109 | restfpr<big_endian>, restfpr1_tail<big_endian>); |
| 5110 | this->savres_define(symtab, |
| 5111 | "_savevr_", 20, 31, |
| 5112 | savevr<big_endian>, savevr_tail<big_endian>); |
| 5113 | this->savres_define(symtab, |
| 5114 | "_restvr_", 20, 31, |
| 5115 | restvr<big_endian>, restvr_tail<big_endian>); |
| 5116 | } |
| 5117 | |
| 5118 | template<int size, bool big_endian> |
| 5119 | void |
| 5120 | Output_data_save_res<size, big_endian>::savres_define( |
| 5121 | Symbol_table* symtab, |
| 5122 | const char *name, |
| 5123 | unsigned int lo, unsigned int hi, |
| 5124 | unsigned char* write_ent(unsigned char*, int), |
| 5125 | unsigned char* write_tail(unsigned char*, int)) |
| 5126 | { |
| 5127 | size_t len = strlen(name); |
| 5128 | bool writing = false; |
| 5129 | char sym[16]; |
| 5130 | |
| 5131 | memcpy(sym, name, len); |
| 5132 | sym[len + 2] = 0; |
| 5133 | |
| 5134 | for (unsigned int i = lo; i <= hi; i++) |
| 5135 | { |
| 5136 | sym[len + 0] = i / 10 + '0'; |
| 5137 | sym[len + 1] = i % 10 + '0'; |
| 5138 | Symbol* gsym = symtab->lookup(sym); |
| 5139 | bool refd = gsym != NULL && gsym->is_undefined(); |
| 5140 | writing = writing || refd; |
| 5141 | if (writing) |
| 5142 | { |
| 5143 | if (this->contents_ == NULL) |
| 5144 | this->contents_ = new unsigned char[this->savres_max]; |
| 5145 | |
| 5146 | section_size_type value = this->current_data_size(); |
| 5147 | unsigned char* p = this->contents_ + value; |
| 5148 | if (i != hi) |
| 5149 | p = write_ent(p, i); |
| 5150 | else |
| 5151 | p = write_tail(p, i); |
| 5152 | section_size_type cur_size = p - this->contents_; |
| 5153 | this->set_current_data_size(cur_size); |
| 5154 | if (refd) |
| 5155 | symtab->define_in_output_data(sym, NULL, Symbol_table::PREDEFINED, |
| 5156 | this, value, cur_size - value, |
| 5157 | elfcpp::STT_FUNC, elfcpp::STB_GLOBAL, |
| 5158 | elfcpp::STV_HIDDEN, 0, false, false); |
| 5159 | } |
| 5160 | } |
| 5161 | } |
| 5162 | |
| 5163 | // Write out save/restore. |
| 5164 | |
| 5165 | template<int size, bool big_endian> |
| 5166 | void |
| 5167 | Output_data_save_res<size, big_endian>::do_write(Output_file* of) |
| 5168 | { |
| 5169 | const section_size_type off = this->offset(); |
| 5170 | const section_size_type oview_size = |
| 5171 | convert_to_section_size_type(this->data_size()); |
| 5172 | unsigned char* const oview = of->get_output_view(off, oview_size); |
| 5173 | memcpy(oview, this->contents_, oview_size); |
| 5174 | of->write_output_view(off, oview_size, oview); |
| 5175 | } |
| 5176 | |
| 5177 | |
| 5178 | // Create the glink section. |
| 5179 | |
| 5180 | template<int size, bool big_endian> |
| 5181 | void |
| 5182 | Target_powerpc<size, big_endian>::make_glink_section(Layout* layout) |
| 5183 | { |
| 5184 | if (this->glink_ == NULL) |
| 5185 | { |
| 5186 | this->glink_ = new Output_data_glink<size, big_endian>(this); |
| 5187 | this->glink_->add_eh_frame(layout); |
| 5188 | layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, |
| 5189 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, |
| 5190 | this->glink_, ORDER_TEXT, false); |
| 5191 | } |
| 5192 | } |
| 5193 | |
| 5194 | // Create a PLT entry for a global symbol. |
| 5195 | |
| 5196 | template<int size, bool big_endian> |
| 5197 | void |
| 5198 | Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab, |
| 5199 | Layout* layout, |
| 5200 | Symbol* gsym) |
| 5201 | { |
| 5202 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 5203 | && gsym->can_use_relative_reloc(false)) |
| 5204 | { |
| 5205 | if (this->iplt_ == NULL) |
| 5206 | this->make_iplt_section(symtab, layout); |
| 5207 | this->iplt_->add_ifunc_entry(gsym); |
| 5208 | } |
| 5209 | else |
| 5210 | { |
| 5211 | if (this->plt_ == NULL) |
| 5212 | this->make_plt_section(symtab, layout); |
| 5213 | this->plt_->add_entry(gsym); |
| 5214 | } |
| 5215 | } |
| 5216 | |
| 5217 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
| 5218 | |
| 5219 | template<int size, bool big_endian> |
| 5220 | void |
| 5221 | Target_powerpc<size, big_endian>::make_local_ifunc_plt_entry( |
| 5222 | Symbol_table* symtab, |
| 5223 | Layout* layout, |
| 5224 | Sized_relobj_file<size, big_endian>* relobj, |
| 5225 | unsigned int r_sym) |
| 5226 | { |
| 5227 | if (this->iplt_ == NULL) |
| 5228 | this->make_iplt_section(symtab, layout); |
| 5229 | this->iplt_->add_local_ifunc_entry(relobj, r_sym); |
| 5230 | } |
| 5231 | |
| 5232 | // Return the number of entries in the PLT. |
| 5233 | |
| 5234 | template<int size, bool big_endian> |
| 5235 | unsigned int |
| 5236 | Target_powerpc<size, big_endian>::plt_entry_count() const |
| 5237 | { |
| 5238 | if (this->plt_ == NULL) |
| 5239 | return 0; |
| 5240 | return this->plt_->entry_count(); |
| 5241 | } |
| 5242 | |
| 5243 | // Create a GOT entry for local dynamic __tls_get_addr calls. |
| 5244 | |
| 5245 | template<int size, bool big_endian> |
| 5246 | unsigned int |
| 5247 | Target_powerpc<size, big_endian>::tlsld_got_offset( |
| 5248 | Symbol_table* symtab, |
| 5249 | Layout* layout, |
| 5250 | Sized_relobj_file<size, big_endian>* object) |
| 5251 | { |
| 5252 | if (this->tlsld_got_offset_ == -1U) |
| 5253 | { |
| 5254 | gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| 5255 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| 5256 | Output_data_got_powerpc<size, big_endian>* got |
| 5257 | = this->got_section(symtab, layout); |
| 5258 | unsigned int got_offset = got->add_constant_pair(0, 0); |
| 5259 | rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got, |
| 5260 | got_offset, 0); |
| 5261 | this->tlsld_got_offset_ = got_offset; |
| 5262 | } |
| 5263 | return this->tlsld_got_offset_; |
| 5264 | } |
| 5265 | |
| 5266 | // Get the Reference_flags for a particular relocation. |
| 5267 | |
| 5268 | template<int size, bool big_endian> |
| 5269 | int |
| 5270 | Target_powerpc<size, big_endian>::Scan::get_reference_flags( |
| 5271 | unsigned int r_type, |
| 5272 | const Target_powerpc* target) |
| 5273 | { |
| 5274 | int ref = 0; |
| 5275 | |
| 5276 | switch (r_type) |
| 5277 | { |
| 5278 | case elfcpp::R_POWERPC_NONE: |
| 5279 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 5280 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 5281 | case elfcpp::R_PPC64_TOC: |
| 5282 | // No symbol reference. |
| 5283 | break; |
| 5284 | |
| 5285 | case elfcpp::R_PPC64_ADDR64: |
| 5286 | case elfcpp::R_PPC64_UADDR64: |
| 5287 | case elfcpp::R_POWERPC_ADDR32: |
| 5288 | case elfcpp::R_POWERPC_UADDR32: |
| 5289 | case elfcpp::R_POWERPC_ADDR16: |
| 5290 | case elfcpp::R_POWERPC_UADDR16: |
| 5291 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 5292 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 5293 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 5294 | ref = Symbol::ABSOLUTE_REF; |
| 5295 | break; |
| 5296 | |
| 5297 | case elfcpp::R_POWERPC_ADDR24: |
| 5298 | case elfcpp::R_POWERPC_ADDR14: |
| 5299 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 5300 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 5301 | ref = Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; |
| 5302 | break; |
| 5303 | |
| 5304 | case elfcpp::R_PPC64_REL64: |
| 5305 | case elfcpp::R_POWERPC_REL32: |
| 5306 | case elfcpp::R_PPC_LOCAL24PC: |
| 5307 | case elfcpp::R_POWERPC_REL16: |
| 5308 | case elfcpp::R_POWERPC_REL16_LO: |
| 5309 | case elfcpp::R_POWERPC_REL16_HI: |
| 5310 | case elfcpp::R_POWERPC_REL16_HA: |
| 5311 | ref = Symbol::RELATIVE_REF; |
| 5312 | break; |
| 5313 | |
| 5314 | case elfcpp::R_POWERPC_REL24: |
| 5315 | case elfcpp::R_PPC_PLTREL24: |
| 5316 | case elfcpp::R_POWERPC_REL14: |
| 5317 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 5318 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 5319 | ref = Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; |
| 5320 | break; |
| 5321 | |
| 5322 | case elfcpp::R_POWERPC_GOT16: |
| 5323 | case elfcpp::R_POWERPC_GOT16_LO: |
| 5324 | case elfcpp::R_POWERPC_GOT16_HI: |
| 5325 | case elfcpp::R_POWERPC_GOT16_HA: |
| 5326 | case elfcpp::R_PPC64_GOT16_DS: |
| 5327 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 5328 | case elfcpp::R_PPC64_TOC16: |
| 5329 | case elfcpp::R_PPC64_TOC16_LO: |
| 5330 | case elfcpp::R_PPC64_TOC16_HI: |
| 5331 | case elfcpp::R_PPC64_TOC16_HA: |
| 5332 | case elfcpp::R_PPC64_TOC16_DS: |
| 5333 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 5334 | ref = Symbol::RELATIVE_REF; |
| 5335 | break; |
| 5336 | |
| 5337 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 5338 | case elfcpp::R_POWERPC_TLS: |
| 5339 | ref = Symbol::TLS_REF; |
| 5340 | break; |
| 5341 | |
| 5342 | case elfcpp::R_POWERPC_COPY: |
| 5343 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 5344 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 5345 | case elfcpp::R_POWERPC_RELATIVE: |
| 5346 | case elfcpp::R_POWERPC_DTPMOD: |
| 5347 | default: |
| 5348 | // Not expected. We will give an error later. |
| 5349 | break; |
| 5350 | } |
| 5351 | |
| 5352 | if (size == 64 && target->abiversion() < 2) |
| 5353 | ref |= Symbol::FUNC_DESC_ABI; |
| 5354 | return ref; |
| 5355 | } |
| 5356 | |
| 5357 | // Report an unsupported relocation against a local symbol. |
| 5358 | |
| 5359 | template<int size, bool big_endian> |
| 5360 | void |
| 5361 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local( |
| 5362 | Sized_relobj_file<size, big_endian>* object, |
| 5363 | unsigned int r_type) |
| 5364 | { |
| 5365 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 5366 | object->name().c_str(), r_type); |
| 5367 | } |
| 5368 | |
| 5369 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
| 5370 | // dynamic linker does not support it, issue an error. |
| 5371 | |
| 5372 | template<int size, bool big_endian> |
| 5373 | void |
| 5374 | Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object, |
| 5375 | unsigned int r_type) |
| 5376 | { |
| 5377 | gold_assert(r_type != elfcpp::R_POWERPC_NONE); |
| 5378 | |
| 5379 | // These are the relocation types supported by glibc for both 32-bit |
| 5380 | // and 64-bit powerpc. |
| 5381 | switch (r_type) |
| 5382 | { |
| 5383 | case elfcpp::R_POWERPC_NONE: |
| 5384 | case elfcpp::R_POWERPC_RELATIVE: |
| 5385 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 5386 | case elfcpp::R_POWERPC_DTPMOD: |
| 5387 | case elfcpp::R_POWERPC_DTPREL: |
| 5388 | case elfcpp::R_POWERPC_TPREL: |
| 5389 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 5390 | case elfcpp::R_POWERPC_COPY: |
| 5391 | case elfcpp::R_POWERPC_IRELATIVE: |
| 5392 | case elfcpp::R_POWERPC_ADDR32: |
| 5393 | case elfcpp::R_POWERPC_UADDR32: |
| 5394 | case elfcpp::R_POWERPC_ADDR24: |
| 5395 | case elfcpp::R_POWERPC_ADDR16: |
| 5396 | case elfcpp::R_POWERPC_UADDR16: |
| 5397 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 5398 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 5399 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 5400 | case elfcpp::R_POWERPC_ADDR14: |
| 5401 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 5402 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 5403 | case elfcpp::R_POWERPC_REL32: |
| 5404 | case elfcpp::R_POWERPC_REL24: |
| 5405 | case elfcpp::R_POWERPC_TPREL16: |
| 5406 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 5407 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 5408 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 5409 | return; |
| 5410 | |
| 5411 | default: |
| 5412 | break; |
| 5413 | } |
| 5414 | |
| 5415 | if (size == 64) |
| 5416 | { |
| 5417 | switch (r_type) |
| 5418 | { |
| 5419 | // These are the relocation types supported only on 64-bit. |
| 5420 | case elfcpp::R_PPC64_ADDR64: |
| 5421 | case elfcpp::R_PPC64_UADDR64: |
| 5422 | case elfcpp::R_PPC64_JMP_IREL: |
| 5423 | case elfcpp::R_PPC64_ADDR16_DS: |
| 5424 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 5425 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 5426 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 5427 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 5428 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 5429 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 5430 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 5431 | case elfcpp::R_PPC64_REL64: |
| 5432 | case elfcpp::R_POWERPC_ADDR30: |
| 5433 | case elfcpp::R_PPC64_TPREL16_DS: |
| 5434 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 5435 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 5436 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 5437 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 5438 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 5439 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 5440 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 5441 | return; |
| 5442 | |
| 5443 | default: |
| 5444 | break; |
| 5445 | } |
| 5446 | } |
| 5447 | else |
| 5448 | { |
| 5449 | switch (r_type) |
| 5450 | { |
| 5451 | // These are the relocation types supported only on 32-bit. |
| 5452 | // ??? glibc ld.so doesn't need to support these. |
| 5453 | case elfcpp::R_POWERPC_DTPREL16: |
| 5454 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 5455 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 5456 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 5457 | return; |
| 5458 | |
| 5459 | default: |
| 5460 | break; |
| 5461 | } |
| 5462 | } |
| 5463 | |
| 5464 | // This prevents us from issuing more than one error per reloc |
| 5465 | // section. But we can still wind up issuing more than one |
| 5466 | // error per object file. |
| 5467 | if (this->issued_non_pic_error_) |
| 5468 | return; |
| 5469 | gold_assert(parameters->options().output_is_position_independent()); |
| 5470 | object->error(_("requires unsupported dynamic reloc; " |
| 5471 | "recompile with -fPIC")); |
| 5472 | this->issued_non_pic_error_ = true; |
| 5473 | return; |
| 5474 | } |
| 5475 | |
| 5476 | // Return whether we need to make a PLT entry for a relocation of the |
| 5477 | // given type against a STT_GNU_IFUNC symbol. |
| 5478 | |
| 5479 | template<int size, bool big_endian> |
| 5480 | bool |
| 5481 | Target_powerpc<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( |
| 5482 | Target_powerpc<size, big_endian>* target, |
| 5483 | Sized_relobj_file<size, big_endian>* object, |
| 5484 | unsigned int r_type, |
| 5485 | bool report_err) |
| 5486 | { |
| 5487 | // In non-pic code any reference will resolve to the plt call stub |
| 5488 | // for the ifunc symbol. |
| 5489 | if ((size == 32 || target->abiversion() >= 2) |
| 5490 | && !parameters->options().output_is_position_independent()) |
| 5491 | return true; |
| 5492 | |
| 5493 | switch (r_type) |
| 5494 | { |
| 5495 | // Word size refs from data sections are OK, but don't need a PLT entry. |
| 5496 | case elfcpp::R_POWERPC_ADDR32: |
| 5497 | case elfcpp::R_POWERPC_UADDR32: |
| 5498 | if (size == 32) |
| 5499 | return false; |
| 5500 | break; |
| 5501 | |
| 5502 | case elfcpp::R_PPC64_ADDR64: |
| 5503 | case elfcpp::R_PPC64_UADDR64: |
| 5504 | if (size == 64) |
| 5505 | return false; |
| 5506 | break; |
| 5507 | |
| 5508 | // GOT refs are good, but also don't need a PLT entry. |
| 5509 | case elfcpp::R_POWERPC_GOT16: |
| 5510 | case elfcpp::R_POWERPC_GOT16_LO: |
| 5511 | case elfcpp::R_POWERPC_GOT16_HI: |
| 5512 | case elfcpp::R_POWERPC_GOT16_HA: |
| 5513 | case elfcpp::R_PPC64_GOT16_DS: |
| 5514 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 5515 | return false; |
| 5516 | |
| 5517 | // Function calls are good, and these do need a PLT entry. |
| 5518 | case elfcpp::R_POWERPC_ADDR24: |
| 5519 | case elfcpp::R_POWERPC_ADDR14: |
| 5520 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 5521 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 5522 | case elfcpp::R_POWERPC_REL24: |
| 5523 | case elfcpp::R_PPC_PLTREL24: |
| 5524 | case elfcpp::R_POWERPC_REL14: |
| 5525 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 5526 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 5527 | return true; |
| 5528 | |
| 5529 | default: |
| 5530 | break; |
| 5531 | } |
| 5532 | |
| 5533 | // Anything else is a problem. |
| 5534 | // If we are building a static executable, the libc startup function |
| 5535 | // responsible for applying indirect function relocations is going |
| 5536 | // to complain about the reloc type. |
| 5537 | // If we are building a dynamic executable, we will have a text |
| 5538 | // relocation. The dynamic loader will set the text segment |
| 5539 | // writable and non-executable to apply text relocations. So we'll |
| 5540 | // segfault when trying to run the indirection function to resolve |
| 5541 | // the reloc. |
| 5542 | if (report_err) |
| 5543 | gold_error(_("%s: unsupported reloc %u for IFUNC symbol"), |
| 5544 | object->name().c_str(), r_type); |
| 5545 | return false; |
| 5546 | } |
| 5547 | |
| 5548 | // Scan a relocation for a local symbol. |
| 5549 | |
| 5550 | template<int size, bool big_endian> |
| 5551 | inline void |
| 5552 | Target_powerpc<size, big_endian>::Scan::local( |
| 5553 | Symbol_table* symtab, |
| 5554 | Layout* layout, |
| 5555 | Target_powerpc<size, big_endian>* target, |
| 5556 | Sized_relobj_file<size, big_endian>* object, |
| 5557 | unsigned int data_shndx, |
| 5558 | Output_section* output_section, |
| 5559 | const elfcpp::Rela<size, big_endian>& reloc, |
| 5560 | unsigned int r_type, |
| 5561 | const elfcpp::Sym<size, big_endian>& lsym, |
| 5562 | bool is_discarded) |
| 5563 | { |
| 5564 | this->maybe_skip_tls_get_addr_call(r_type, NULL); |
| 5565 | |
| 5566 | if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 5567 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 5568 | { |
| 5569 | this->expect_tls_get_addr_call(); |
| 5570 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); |
| 5571 | if (tls_type != tls::TLSOPT_NONE) |
| 5572 | this->skip_next_tls_get_addr_call(); |
| 5573 | } |
| 5574 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 5575 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 5576 | { |
| 5577 | this->expect_tls_get_addr_call(); |
| 5578 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 5579 | if (tls_type != tls::TLSOPT_NONE) |
| 5580 | this->skip_next_tls_get_addr_call(); |
| 5581 | } |
| 5582 | |
| 5583 | Powerpc_relobj<size, big_endian>* ppc_object |
| 5584 | = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| 5585 | |
| 5586 | if (is_discarded) |
| 5587 | { |
| 5588 | if (size == 64 |
| 5589 | && data_shndx == ppc_object->opd_shndx() |
| 5590 | && r_type == elfcpp::R_PPC64_ADDR64) |
| 5591 | ppc_object->set_opd_discard(reloc.get_r_offset()); |
| 5592 | return; |
| 5593 | } |
| 5594 | |
| 5595 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
| 5596 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
| 5597 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true)) |
| 5598 | { |
| 5599 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 5600 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 5601 | r_type, r_sym, reloc.get_r_addend()); |
| 5602 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
| 5603 | } |
| 5604 | |
| 5605 | switch (r_type) |
| 5606 | { |
| 5607 | case elfcpp::R_POWERPC_NONE: |
| 5608 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 5609 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 5610 | case elfcpp::R_PPC64_TOCSAVE: |
| 5611 | case elfcpp::R_POWERPC_TLS: |
| 5612 | case elfcpp::R_PPC64_ENTRY: |
| 5613 | break; |
| 5614 | |
| 5615 | case elfcpp::R_PPC64_TOC: |
| 5616 | { |
| 5617 | Output_data_got_powerpc<size, big_endian>* got |
| 5618 | = target->got_section(symtab, layout); |
| 5619 | if (parameters->options().output_is_position_independent()) |
| 5620 | { |
| 5621 | Address off = reloc.get_r_offset(); |
| 5622 | if (size == 64 |
| 5623 | && target->abiversion() < 2 |
| 5624 | && data_shndx == ppc_object->opd_shndx() |
| 5625 | && ppc_object->get_opd_discard(off - 8)) |
| 5626 | break; |
| 5627 | |
| 5628 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 5629 | Powerpc_relobj<size, big_endian>* symobj = ppc_object; |
| 5630 | rela_dyn->add_output_section_relative(got->output_section(), |
| 5631 | elfcpp::R_POWERPC_RELATIVE, |
| 5632 | output_section, |
| 5633 | object, data_shndx, off, |
| 5634 | symobj->toc_base_offset()); |
| 5635 | } |
| 5636 | } |
| 5637 | break; |
| 5638 | |
| 5639 | case elfcpp::R_PPC64_ADDR64: |
| 5640 | case elfcpp::R_PPC64_UADDR64: |
| 5641 | case elfcpp::R_POWERPC_ADDR32: |
| 5642 | case elfcpp::R_POWERPC_UADDR32: |
| 5643 | case elfcpp::R_POWERPC_ADDR24: |
| 5644 | case elfcpp::R_POWERPC_ADDR16: |
| 5645 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 5646 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 5647 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 5648 | case elfcpp::R_POWERPC_UADDR16: |
| 5649 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 5650 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 5651 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 5652 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 5653 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 5654 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 5655 | case elfcpp::R_PPC64_ADDR16_DS: |
| 5656 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 5657 | case elfcpp::R_POWERPC_ADDR14: |
| 5658 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 5659 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 5660 | // If building a shared library (or a position-independent |
| 5661 | // executable), we need to create a dynamic relocation for |
| 5662 | // this location. |
| 5663 | if (parameters->options().output_is_position_independent() |
| 5664 | || (size == 64 && is_ifunc && target->abiversion() < 2)) |
| 5665 | { |
| 5666 | Reloc_section* rela_dyn = target->rela_dyn_section(symtab, layout, |
| 5667 | is_ifunc); |
| 5668 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 5669 | if ((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32) |
| 5670 | || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64)) |
| 5671 | { |
| 5672 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 5673 | : elfcpp::R_POWERPC_RELATIVE); |
| 5674 | rela_dyn->add_local_relative(object, r_sym, dynrel, |
| 5675 | output_section, data_shndx, |
| 5676 | reloc.get_r_offset(), |
| 5677 | reloc.get_r_addend(), false); |
| 5678 | } |
| 5679 | else if (lsym.get_st_type() != elfcpp::STT_SECTION) |
| 5680 | { |
| 5681 | check_non_pic(object, r_type); |
| 5682 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
| 5683 | data_shndx, reloc.get_r_offset(), |
| 5684 | reloc.get_r_addend()); |
| 5685 | } |
| 5686 | else |
| 5687 | { |
| 5688 | gold_assert(lsym.get_st_value() == 0); |
| 5689 | unsigned int shndx = lsym.get_st_shndx(); |
| 5690 | bool is_ordinary; |
| 5691 | shndx = object->adjust_sym_shndx(r_sym, shndx, |
| 5692 | &is_ordinary); |
| 5693 | if (!is_ordinary) |
| 5694 | object->error(_("section symbol %u has bad shndx %u"), |
| 5695 | r_sym, shndx); |
| 5696 | else |
| 5697 | rela_dyn->add_local_section(object, shndx, r_type, |
| 5698 | output_section, data_shndx, |
| 5699 | reloc.get_r_offset()); |
| 5700 | } |
| 5701 | } |
| 5702 | break; |
| 5703 | |
| 5704 | case elfcpp::R_POWERPC_REL24: |
| 5705 | case elfcpp::R_PPC_PLTREL24: |
| 5706 | case elfcpp::R_PPC_LOCAL24PC: |
| 5707 | case elfcpp::R_POWERPC_REL14: |
| 5708 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 5709 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 5710 | if (!is_ifunc) |
| 5711 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 5712 | r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()), |
| 5713 | reloc.get_r_addend()); |
| 5714 | break; |
| 5715 | |
| 5716 | case elfcpp::R_PPC64_REL64: |
| 5717 | case elfcpp::R_POWERPC_REL32: |
| 5718 | case elfcpp::R_POWERPC_REL16: |
| 5719 | case elfcpp::R_POWERPC_REL16_LO: |
| 5720 | case elfcpp::R_POWERPC_REL16_HI: |
| 5721 | case elfcpp::R_POWERPC_REL16_HA: |
| 5722 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 5723 | case elfcpp::R_POWERPC_SECTOFF: |
| 5724 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 5725 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 5726 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 5727 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 5728 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 5729 | case elfcpp::R_POWERPC_TPREL16: |
| 5730 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 5731 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 5732 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 5733 | case elfcpp::R_PPC64_TPREL16_DS: |
| 5734 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 5735 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 5736 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 5737 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 5738 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 5739 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 5740 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 5741 | case elfcpp::R_POWERPC_DTPREL16: |
| 5742 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 5743 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 5744 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 5745 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 5746 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 5747 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 5748 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 5749 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 5750 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 5751 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 5752 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 5753 | case elfcpp::R_PPC64_TLSGD: |
| 5754 | case elfcpp::R_PPC64_TLSLD: |
| 5755 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 5756 | break; |
| 5757 | |
| 5758 | case elfcpp::R_POWERPC_GOT16: |
| 5759 | case elfcpp::R_POWERPC_GOT16_LO: |
| 5760 | case elfcpp::R_POWERPC_GOT16_HI: |
| 5761 | case elfcpp::R_POWERPC_GOT16_HA: |
| 5762 | case elfcpp::R_PPC64_GOT16_DS: |
| 5763 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 5764 | { |
| 5765 | // The symbol requires a GOT entry. |
| 5766 | Output_data_got_powerpc<size, big_endian>* got |
| 5767 | = target->got_section(symtab, layout); |
| 5768 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 5769 | |
| 5770 | if (!parameters->options().output_is_position_independent()) |
| 5771 | { |
| 5772 | if (is_ifunc |
| 5773 | && (size == 32 || target->abiversion() >= 2)) |
| 5774 | got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
| 5775 | else |
| 5776 | got->add_local(object, r_sym, GOT_TYPE_STANDARD); |
| 5777 | } |
| 5778 | else if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) |
| 5779 | { |
| 5780 | // If we are generating a shared object or a pie, this |
| 5781 | // symbol's GOT entry will be set by a dynamic relocation. |
| 5782 | unsigned int off; |
| 5783 | off = got->add_constant(0); |
| 5784 | object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off); |
| 5785 | |
| 5786 | Reloc_section* rela_dyn = target->rela_dyn_section(symtab, layout, |
| 5787 | is_ifunc); |
| 5788 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 5789 | : elfcpp::R_POWERPC_RELATIVE); |
| 5790 | rela_dyn->add_local_relative(object, r_sym, dynrel, |
| 5791 | got, off, 0, false); |
| 5792 | } |
| 5793 | } |
| 5794 | break; |
| 5795 | |
| 5796 | case elfcpp::R_PPC64_TOC16: |
| 5797 | case elfcpp::R_PPC64_TOC16_LO: |
| 5798 | case elfcpp::R_PPC64_TOC16_HI: |
| 5799 | case elfcpp::R_PPC64_TOC16_HA: |
| 5800 | case elfcpp::R_PPC64_TOC16_DS: |
| 5801 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 5802 | // We need a GOT section. |
| 5803 | target->got_section(symtab, layout); |
| 5804 | break; |
| 5805 | |
| 5806 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 5807 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 5808 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 5809 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 5810 | { |
| 5811 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(true); |
| 5812 | if (tls_type == tls::TLSOPT_NONE) |
| 5813 | { |
| 5814 | Output_data_got_powerpc<size, big_endian>* got |
| 5815 | = target->got_section(symtab, layout); |
| 5816 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 5817 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 5818 | got->add_local_tls_pair(object, r_sym, GOT_TYPE_TLSGD, |
| 5819 | rela_dyn, elfcpp::R_POWERPC_DTPMOD); |
| 5820 | } |
| 5821 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 5822 | { |
| 5823 | // no GOT relocs needed for Local Exec. |
| 5824 | } |
| 5825 | else |
| 5826 | gold_unreachable(); |
| 5827 | } |
| 5828 | break; |
| 5829 | |
| 5830 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 5831 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 5832 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 5833 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 5834 | { |
| 5835 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 5836 | if (tls_type == tls::TLSOPT_NONE) |
| 5837 | target->tlsld_got_offset(symtab, layout, object); |
| 5838 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 5839 | { |
| 5840 | // no GOT relocs needed for Local Exec. |
| 5841 | if (parameters->options().emit_relocs()) |
| 5842 | { |
| 5843 | Output_section* os = layout->tls_segment()->first_section(); |
| 5844 | gold_assert(os != NULL); |
| 5845 | os->set_needs_symtab_index(); |
| 5846 | } |
| 5847 | } |
| 5848 | else |
| 5849 | gold_unreachable(); |
| 5850 | } |
| 5851 | break; |
| 5852 | |
| 5853 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 5854 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 5855 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 5856 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 5857 | { |
| 5858 | Output_data_got_powerpc<size, big_endian>* got |
| 5859 | = target->got_section(symtab, layout); |
| 5860 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 5861 | got->add_local_tls(object, r_sym, GOT_TYPE_DTPREL); |
| 5862 | } |
| 5863 | break; |
| 5864 | |
| 5865 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 5866 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 5867 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 5868 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 5869 | { |
| 5870 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(true); |
| 5871 | if (tls_type == tls::TLSOPT_NONE) |
| 5872 | { |
| 5873 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 5874 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)) |
| 5875 | { |
| 5876 | Output_data_got_powerpc<size, big_endian>* got |
| 5877 | = target->got_section(symtab, layout); |
| 5878 | unsigned int off = got->add_constant(0); |
| 5879 | object->set_local_got_offset(r_sym, GOT_TYPE_TPREL, off); |
| 5880 | |
| 5881 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 5882 | rela_dyn->add_symbolless_local_addend(object, r_sym, |
| 5883 | elfcpp::R_POWERPC_TPREL, |
| 5884 | got, off, 0); |
| 5885 | } |
| 5886 | } |
| 5887 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 5888 | { |
| 5889 | // no GOT relocs needed for Local Exec. |
| 5890 | } |
| 5891 | else |
| 5892 | gold_unreachable(); |
| 5893 | } |
| 5894 | break; |
| 5895 | |
| 5896 | default: |
| 5897 | unsupported_reloc_local(object, r_type); |
| 5898 | break; |
| 5899 | } |
| 5900 | |
| 5901 | switch (r_type) |
| 5902 | { |
| 5903 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 5904 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 5905 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 5906 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 5907 | case elfcpp::R_POWERPC_GOT16: |
| 5908 | case elfcpp::R_PPC64_GOT16_DS: |
| 5909 | case elfcpp::R_PPC64_TOC16: |
| 5910 | case elfcpp::R_PPC64_TOC16_DS: |
| 5911 | ppc_object->set_has_small_toc_reloc(); |
| 5912 | default: |
| 5913 | break; |
| 5914 | } |
| 5915 | } |
| 5916 | |
| 5917 | // Report an unsupported relocation against a global symbol. |
| 5918 | |
| 5919 | template<int size, bool big_endian> |
| 5920 | void |
| 5921 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global( |
| 5922 | Sized_relobj_file<size, big_endian>* object, |
| 5923 | unsigned int r_type, |
| 5924 | Symbol* gsym) |
| 5925 | { |
| 5926 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 5927 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| 5928 | } |
| 5929 | |
| 5930 | // Scan a relocation for a global symbol. |
| 5931 | |
| 5932 | template<int size, bool big_endian> |
| 5933 | inline void |
| 5934 | Target_powerpc<size, big_endian>::Scan::global( |
| 5935 | Symbol_table* symtab, |
| 5936 | Layout* layout, |
| 5937 | Target_powerpc<size, big_endian>* target, |
| 5938 | Sized_relobj_file<size, big_endian>* object, |
| 5939 | unsigned int data_shndx, |
| 5940 | Output_section* output_section, |
| 5941 | const elfcpp::Rela<size, big_endian>& reloc, |
| 5942 | unsigned int r_type, |
| 5943 | Symbol* gsym) |
| 5944 | { |
| 5945 | if (this->maybe_skip_tls_get_addr_call(r_type, gsym) == Track_tls::SKIP) |
| 5946 | return; |
| 5947 | |
| 5948 | if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 5949 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 5950 | { |
| 5951 | this->expect_tls_get_addr_call(); |
| 5952 | const bool final = gsym->final_value_is_known(); |
| 5953 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 5954 | if (tls_type != tls::TLSOPT_NONE) |
| 5955 | this->skip_next_tls_get_addr_call(); |
| 5956 | } |
| 5957 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 5958 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 5959 | { |
| 5960 | this->expect_tls_get_addr_call(); |
| 5961 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 5962 | if (tls_type != tls::TLSOPT_NONE) |
| 5963 | this->skip_next_tls_get_addr_call(); |
| 5964 | } |
| 5965 | |
| 5966 | Powerpc_relobj<size, big_endian>* ppc_object |
| 5967 | = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| 5968 | |
| 5969 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
| 5970 | bool is_ifunc = gsym->type() == elfcpp::STT_GNU_IFUNC; |
| 5971 | bool pushed_ifunc = false; |
| 5972 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(target, object, r_type, true)) |
| 5973 | { |
| 5974 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 5975 | r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()), |
| 5976 | reloc.get_r_addend()); |
| 5977 | target->make_plt_entry(symtab, layout, gsym); |
| 5978 | pushed_ifunc = true; |
| 5979 | } |
| 5980 | |
| 5981 | switch (r_type) |
| 5982 | { |
| 5983 | case elfcpp::R_POWERPC_NONE: |
| 5984 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 5985 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 5986 | case elfcpp::R_PPC_LOCAL24PC: |
| 5987 | case elfcpp::R_POWERPC_TLS: |
| 5988 | case elfcpp::R_PPC64_ENTRY: |
| 5989 | break; |
| 5990 | |
| 5991 | case elfcpp::R_PPC64_TOC: |
| 5992 | { |
| 5993 | Output_data_got_powerpc<size, big_endian>* got |
| 5994 | = target->got_section(symtab, layout); |
| 5995 | if (parameters->options().output_is_position_independent()) |
| 5996 | { |
| 5997 | Address off = reloc.get_r_offset(); |
| 5998 | if (size == 64 |
| 5999 | && data_shndx == ppc_object->opd_shndx() |
| 6000 | && ppc_object->get_opd_discard(off - 8)) |
| 6001 | break; |
| 6002 | |
| 6003 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6004 | Powerpc_relobj<size, big_endian>* symobj = ppc_object; |
| 6005 | if (data_shndx != ppc_object->opd_shndx()) |
| 6006 | symobj = static_cast |
| 6007 | <Powerpc_relobj<size, big_endian>*>(gsym->object()); |
| 6008 | rela_dyn->add_output_section_relative(got->output_section(), |
| 6009 | elfcpp::R_POWERPC_RELATIVE, |
| 6010 | output_section, |
| 6011 | object, data_shndx, off, |
| 6012 | symobj->toc_base_offset()); |
| 6013 | } |
| 6014 | } |
| 6015 | break; |
| 6016 | |
| 6017 | case elfcpp::R_PPC64_ADDR64: |
| 6018 | if (size == 64 |
| 6019 | && target->abiversion() < 2 |
| 6020 | && data_shndx == ppc_object->opd_shndx() |
| 6021 | && (gsym->is_defined_in_discarded_section() |
| 6022 | || gsym->object() != object)) |
| 6023 | { |
| 6024 | ppc_object->set_opd_discard(reloc.get_r_offset()); |
| 6025 | break; |
| 6026 | } |
| 6027 | // Fall thru |
| 6028 | case elfcpp::R_PPC64_UADDR64: |
| 6029 | case elfcpp::R_POWERPC_ADDR32: |
| 6030 | case elfcpp::R_POWERPC_UADDR32: |
| 6031 | case elfcpp::R_POWERPC_ADDR24: |
| 6032 | case elfcpp::R_POWERPC_ADDR16: |
| 6033 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 6034 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 6035 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 6036 | case elfcpp::R_POWERPC_UADDR16: |
| 6037 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 6038 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 6039 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 6040 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 6041 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 6042 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 6043 | case elfcpp::R_PPC64_ADDR16_DS: |
| 6044 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 6045 | case elfcpp::R_POWERPC_ADDR14: |
| 6046 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 6047 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 6048 | { |
| 6049 | // Make a PLT entry if necessary. |
| 6050 | if (gsym->needs_plt_entry()) |
| 6051 | { |
| 6052 | // Since this is not a PC-relative relocation, we may be |
| 6053 | // taking the address of a function. In that case we need to |
| 6054 | // set the entry in the dynamic symbol table to the address of |
| 6055 | // the PLT call stub. |
| 6056 | bool need_ifunc_plt = false; |
| 6057 | if ((size == 32 || target->abiversion() >= 2) |
| 6058 | && gsym->is_from_dynobj() |
| 6059 | && !parameters->options().output_is_position_independent()) |
| 6060 | { |
| 6061 | gsym->set_needs_dynsym_value(); |
| 6062 | need_ifunc_plt = true; |
| 6063 | } |
| 6064 | if (!is_ifunc || (!pushed_ifunc && need_ifunc_plt)) |
| 6065 | { |
| 6066 | target->push_branch(ppc_object, data_shndx, |
| 6067 | reloc.get_r_offset(), r_type, |
| 6068 | elfcpp::elf_r_sym<size>(reloc.get_r_info()), |
| 6069 | reloc.get_r_addend()); |
| 6070 | target->make_plt_entry(symtab, layout, gsym); |
| 6071 | } |
| 6072 | } |
| 6073 | // Make a dynamic relocation if necessary. |
| 6074 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target)) |
| 6075 | || (size == 64 && is_ifunc && target->abiversion() < 2)) |
| 6076 | { |
| 6077 | if (!parameters->options().output_is_position_independent() |
| 6078 | && gsym->may_need_copy_reloc()) |
| 6079 | { |
| 6080 | target->copy_reloc(symtab, layout, object, |
| 6081 | data_shndx, output_section, gsym, reloc); |
| 6082 | } |
| 6083 | else if ((((size == 32 |
| 6084 | && r_type == elfcpp::R_POWERPC_ADDR32) |
| 6085 | || (size == 64 |
| 6086 | && r_type == elfcpp::R_PPC64_ADDR64 |
| 6087 | && target->abiversion() >= 2)) |
| 6088 | && gsym->can_use_relative_reloc(false) |
| 6089 | && !(gsym->visibility() == elfcpp::STV_PROTECTED |
| 6090 | && parameters->options().shared())) |
| 6091 | || (size == 64 |
| 6092 | && r_type == elfcpp::R_PPC64_ADDR64 |
| 6093 | && target->abiversion() < 2 |
| 6094 | && (gsym->can_use_relative_reloc(false) |
| 6095 | || data_shndx == ppc_object->opd_shndx()))) |
| 6096 | { |
| 6097 | Reloc_section* rela_dyn |
| 6098 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 6099 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 6100 | : elfcpp::R_POWERPC_RELATIVE); |
| 6101 | rela_dyn->add_symbolless_global_addend( |
| 6102 | gsym, dynrel, output_section, object, data_shndx, |
| 6103 | reloc.get_r_offset(), reloc.get_r_addend()); |
| 6104 | } |
| 6105 | else |
| 6106 | { |
| 6107 | Reloc_section* rela_dyn |
| 6108 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 6109 | check_non_pic(object, r_type); |
| 6110 | rela_dyn->add_global(gsym, r_type, output_section, |
| 6111 | object, data_shndx, |
| 6112 | reloc.get_r_offset(), |
| 6113 | reloc.get_r_addend()); |
| 6114 | } |
| 6115 | } |
| 6116 | } |
| 6117 | break; |
| 6118 | |
| 6119 | case elfcpp::R_PPC_PLTREL24: |
| 6120 | case elfcpp::R_POWERPC_REL24: |
| 6121 | if (!is_ifunc) |
| 6122 | { |
| 6123 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 6124 | r_type, |
| 6125 | elfcpp::elf_r_sym<size>(reloc.get_r_info()), |
| 6126 | reloc.get_r_addend()); |
| 6127 | if (gsym->needs_plt_entry() |
| 6128 | || (!gsym->final_value_is_known() |
| 6129 | && (gsym->is_undefined() |
| 6130 | || gsym->is_from_dynobj() |
| 6131 | || gsym->is_preemptible()))) |
| 6132 | target->make_plt_entry(symtab, layout, gsym); |
| 6133 | } |
| 6134 | // Fall thru |
| 6135 | |
| 6136 | case elfcpp::R_PPC64_REL64: |
| 6137 | case elfcpp::R_POWERPC_REL32: |
| 6138 | // Make a dynamic relocation if necessary. |
| 6139 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type, target))) |
| 6140 | { |
| 6141 | if (!parameters->options().output_is_position_independent() |
| 6142 | && gsym->may_need_copy_reloc()) |
| 6143 | { |
| 6144 | target->copy_reloc(symtab, layout, object, |
| 6145 | data_shndx, output_section, gsym, |
| 6146 | reloc); |
| 6147 | } |
| 6148 | else |
| 6149 | { |
| 6150 | Reloc_section* rela_dyn |
| 6151 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 6152 | check_non_pic(object, r_type); |
| 6153 | rela_dyn->add_global(gsym, r_type, output_section, object, |
| 6154 | data_shndx, reloc.get_r_offset(), |
| 6155 | reloc.get_r_addend()); |
| 6156 | } |
| 6157 | } |
| 6158 | break; |
| 6159 | |
| 6160 | case elfcpp::R_POWERPC_REL14: |
| 6161 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 6162 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 6163 | if (!is_ifunc) |
| 6164 | target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(), |
| 6165 | r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()), |
| 6166 | reloc.get_r_addend()); |
| 6167 | break; |
| 6168 | |
| 6169 | case elfcpp::R_POWERPC_REL16: |
| 6170 | case elfcpp::R_POWERPC_REL16_LO: |
| 6171 | case elfcpp::R_POWERPC_REL16_HI: |
| 6172 | case elfcpp::R_POWERPC_REL16_HA: |
| 6173 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 6174 | case elfcpp::R_POWERPC_SECTOFF: |
| 6175 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 6176 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 6177 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 6178 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 6179 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 6180 | case elfcpp::R_POWERPC_TPREL16: |
| 6181 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 6182 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 6183 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 6184 | case elfcpp::R_PPC64_TPREL16_DS: |
| 6185 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 6186 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 6187 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 6188 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 6189 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 6190 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 6191 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 6192 | case elfcpp::R_POWERPC_DTPREL16: |
| 6193 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 6194 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 6195 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 6196 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 6197 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 6198 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 6199 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 6200 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 6201 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 6202 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 6203 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 6204 | case elfcpp::R_PPC64_TLSGD: |
| 6205 | case elfcpp::R_PPC64_TLSLD: |
| 6206 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 6207 | break; |
| 6208 | |
| 6209 | case elfcpp::R_POWERPC_GOT16: |
| 6210 | case elfcpp::R_POWERPC_GOT16_LO: |
| 6211 | case elfcpp::R_POWERPC_GOT16_HI: |
| 6212 | case elfcpp::R_POWERPC_GOT16_HA: |
| 6213 | case elfcpp::R_PPC64_GOT16_DS: |
| 6214 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 6215 | { |
| 6216 | // The symbol requires a GOT entry. |
| 6217 | Output_data_got_powerpc<size, big_endian>* got; |
| 6218 | |
| 6219 | got = target->got_section(symtab, layout); |
| 6220 | if (gsym->final_value_is_known()) |
| 6221 | { |
| 6222 | if (is_ifunc |
| 6223 | && (size == 32 || target->abiversion() >= 2)) |
| 6224 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 6225 | else |
| 6226 | got->add_global(gsym, GOT_TYPE_STANDARD); |
| 6227 | } |
| 6228 | else if (!gsym->has_got_offset(GOT_TYPE_STANDARD)) |
| 6229 | { |
| 6230 | // If we are generating a shared object or a pie, this |
| 6231 | // symbol's GOT entry will be set by a dynamic relocation. |
| 6232 | unsigned int off = got->add_constant(0); |
| 6233 | gsym->set_got_offset(GOT_TYPE_STANDARD, off); |
| 6234 | |
| 6235 | Reloc_section* rela_dyn |
| 6236 | = target->rela_dyn_section(symtab, layout, is_ifunc); |
| 6237 | |
| 6238 | if (gsym->can_use_relative_reloc(false) |
| 6239 | && !((size == 32 |
| 6240 | || target->abiversion() >= 2) |
| 6241 | && gsym->visibility() == elfcpp::STV_PROTECTED |
| 6242 | && parameters->options().shared())) |
| 6243 | { |
| 6244 | unsigned int dynrel = (is_ifunc ? elfcpp::R_POWERPC_IRELATIVE |
| 6245 | : elfcpp::R_POWERPC_RELATIVE); |
| 6246 | rela_dyn->add_global_relative(gsym, dynrel, got, off, 0, false); |
| 6247 | } |
| 6248 | else |
| 6249 | { |
| 6250 | unsigned int dynrel = elfcpp::R_POWERPC_GLOB_DAT; |
| 6251 | rela_dyn->add_global(gsym, dynrel, got, off, 0); |
| 6252 | } |
| 6253 | } |
| 6254 | } |
| 6255 | break; |
| 6256 | |
| 6257 | case elfcpp::R_PPC64_TOC16: |
| 6258 | case elfcpp::R_PPC64_TOC16_LO: |
| 6259 | case elfcpp::R_PPC64_TOC16_HI: |
| 6260 | case elfcpp::R_PPC64_TOC16_HA: |
| 6261 | case elfcpp::R_PPC64_TOC16_DS: |
| 6262 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 6263 | // We need a GOT section. |
| 6264 | target->got_section(symtab, layout); |
| 6265 | break; |
| 6266 | |
| 6267 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 6268 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 6269 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 6270 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 6271 | { |
| 6272 | const bool final = gsym->final_value_is_known(); |
| 6273 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 6274 | if (tls_type == tls::TLSOPT_NONE) |
| 6275 | { |
| 6276 | Output_data_got_powerpc<size, big_endian>* got |
| 6277 | = target->got_section(symtab, layout); |
| 6278 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6279 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLSGD, rela_dyn, |
| 6280 | elfcpp::R_POWERPC_DTPMOD, |
| 6281 | elfcpp::R_POWERPC_DTPREL); |
| 6282 | } |
| 6283 | else if (tls_type == tls::TLSOPT_TO_IE) |
| 6284 | { |
| 6285 | if (!gsym->has_got_offset(GOT_TYPE_TPREL)) |
| 6286 | { |
| 6287 | Output_data_got_powerpc<size, big_endian>* got |
| 6288 | = target->got_section(symtab, layout); |
| 6289 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6290 | if (gsym->is_undefined() |
| 6291 | || gsym->is_from_dynobj()) |
| 6292 | { |
| 6293 | got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn, |
| 6294 | elfcpp::R_POWERPC_TPREL); |
| 6295 | } |
| 6296 | else |
| 6297 | { |
| 6298 | unsigned int off = got->add_constant(0); |
| 6299 | gsym->set_got_offset(GOT_TYPE_TPREL, off); |
| 6300 | unsigned int dynrel = elfcpp::R_POWERPC_TPREL; |
| 6301 | rela_dyn->add_symbolless_global_addend(gsym, dynrel, |
| 6302 | got, off, 0); |
| 6303 | } |
| 6304 | } |
| 6305 | } |
| 6306 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 6307 | { |
| 6308 | // no GOT relocs needed for Local Exec. |
| 6309 | } |
| 6310 | else |
| 6311 | gold_unreachable(); |
| 6312 | } |
| 6313 | break; |
| 6314 | |
| 6315 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 6316 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 6317 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 6318 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 6319 | { |
| 6320 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 6321 | if (tls_type == tls::TLSOPT_NONE) |
| 6322 | target->tlsld_got_offset(symtab, layout, object); |
| 6323 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 6324 | { |
| 6325 | // no GOT relocs needed for Local Exec. |
| 6326 | if (parameters->options().emit_relocs()) |
| 6327 | { |
| 6328 | Output_section* os = layout->tls_segment()->first_section(); |
| 6329 | gold_assert(os != NULL); |
| 6330 | os->set_needs_symtab_index(); |
| 6331 | } |
| 6332 | } |
| 6333 | else |
| 6334 | gold_unreachable(); |
| 6335 | } |
| 6336 | break; |
| 6337 | |
| 6338 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 6339 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 6340 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 6341 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 6342 | { |
| 6343 | Output_data_got_powerpc<size, big_endian>* got |
| 6344 | = target->got_section(symtab, layout); |
| 6345 | if (!gsym->final_value_is_known() |
| 6346 | && (gsym->is_from_dynobj() |
| 6347 | || gsym->is_undefined() |
| 6348 | || gsym->is_preemptible())) |
| 6349 | got->add_global_with_rel(gsym, GOT_TYPE_DTPREL, |
| 6350 | target->rela_dyn_section(layout), |
| 6351 | elfcpp::R_POWERPC_DTPREL); |
| 6352 | else |
| 6353 | got->add_global_tls(gsym, GOT_TYPE_DTPREL); |
| 6354 | } |
| 6355 | break; |
| 6356 | |
| 6357 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 6358 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 6359 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 6360 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 6361 | { |
| 6362 | const bool final = gsym->final_value_is_known(); |
| 6363 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| 6364 | if (tls_type == tls::TLSOPT_NONE) |
| 6365 | { |
| 6366 | if (!gsym->has_got_offset(GOT_TYPE_TPREL)) |
| 6367 | { |
| 6368 | Output_data_got_powerpc<size, big_endian>* got |
| 6369 | = target->got_section(symtab, layout); |
| 6370 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6371 | if (gsym->is_undefined() |
| 6372 | || gsym->is_from_dynobj()) |
| 6373 | { |
| 6374 | got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn, |
| 6375 | elfcpp::R_POWERPC_TPREL); |
| 6376 | } |
| 6377 | else |
| 6378 | { |
| 6379 | unsigned int off = got->add_constant(0); |
| 6380 | gsym->set_got_offset(GOT_TYPE_TPREL, off); |
| 6381 | unsigned int dynrel = elfcpp::R_POWERPC_TPREL; |
| 6382 | rela_dyn->add_symbolless_global_addend(gsym, dynrel, |
| 6383 | got, off, 0); |
| 6384 | } |
| 6385 | } |
| 6386 | } |
| 6387 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 6388 | { |
| 6389 | // no GOT relocs needed for Local Exec. |
| 6390 | } |
| 6391 | else |
| 6392 | gold_unreachable(); |
| 6393 | } |
| 6394 | break; |
| 6395 | |
| 6396 | default: |
| 6397 | unsupported_reloc_global(object, r_type, gsym); |
| 6398 | break; |
| 6399 | } |
| 6400 | |
| 6401 | switch (r_type) |
| 6402 | { |
| 6403 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 6404 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 6405 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 6406 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 6407 | case elfcpp::R_POWERPC_GOT16: |
| 6408 | case elfcpp::R_PPC64_GOT16_DS: |
| 6409 | case elfcpp::R_PPC64_TOC16: |
| 6410 | case elfcpp::R_PPC64_TOC16_DS: |
| 6411 | ppc_object->set_has_small_toc_reloc(); |
| 6412 | default: |
| 6413 | break; |
| 6414 | } |
| 6415 | } |
| 6416 | |
| 6417 | // Process relocations for gc. |
| 6418 | |
| 6419 | template<int size, bool big_endian> |
| 6420 | void |
| 6421 | Target_powerpc<size, big_endian>::gc_process_relocs( |
| 6422 | Symbol_table* symtab, |
| 6423 | Layout* layout, |
| 6424 | Sized_relobj_file<size, big_endian>* object, |
| 6425 | unsigned int data_shndx, |
| 6426 | unsigned int, |
| 6427 | const unsigned char* prelocs, |
| 6428 | size_t reloc_count, |
| 6429 | Output_section* output_section, |
| 6430 | bool needs_special_offset_handling, |
| 6431 | size_t local_symbol_count, |
| 6432 | const unsigned char* plocal_symbols) |
| 6433 | { |
| 6434 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 6435 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 6436 | Classify_reloc; |
| 6437 | |
| 6438 | Powerpc_relobj<size, big_endian>* ppc_object |
| 6439 | = static_cast<Powerpc_relobj<size, big_endian>*>(object); |
| 6440 | if (size == 64) |
| 6441 | ppc_object->set_opd_valid(); |
| 6442 | if (size == 64 && data_shndx == ppc_object->opd_shndx()) |
| 6443 | { |
| 6444 | typename Powerpc_relobj<size, big_endian>::Access_from::iterator p; |
| 6445 | for (p = ppc_object->access_from_map()->begin(); |
| 6446 | p != ppc_object->access_from_map()->end(); |
| 6447 | ++p) |
| 6448 | { |
| 6449 | Address dst_off = p->first; |
| 6450 | unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); |
| 6451 | typename Powerpc_relobj<size, big_endian>::Section_refs::iterator s; |
| 6452 | for (s = p->second.begin(); s != p->second.end(); ++s) |
| 6453 | { |
| 6454 | Relobj* src_obj = s->first; |
| 6455 | unsigned int src_indx = s->second; |
| 6456 | symtab->gc()->add_reference(src_obj, src_indx, |
| 6457 | ppc_object, dst_indx); |
| 6458 | } |
| 6459 | p->second.clear(); |
| 6460 | } |
| 6461 | ppc_object->access_from_map()->clear(); |
| 6462 | ppc_object->process_gc_mark(symtab); |
| 6463 | // Don't look at .opd relocs as .opd will reference everything. |
| 6464 | return; |
| 6465 | } |
| 6466 | |
| 6467 | gold::gc_process_relocs<size, big_endian, Powerpc, Scan, Classify_reloc>( |
| 6468 | symtab, |
| 6469 | layout, |
| 6470 | this, |
| 6471 | object, |
| 6472 | data_shndx, |
| 6473 | prelocs, |
| 6474 | reloc_count, |
| 6475 | output_section, |
| 6476 | needs_special_offset_handling, |
| 6477 | local_symbol_count, |
| 6478 | plocal_symbols); |
| 6479 | } |
| 6480 | |
| 6481 | // Handle target specific gc actions when adding a gc reference from |
| 6482 | // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX |
| 6483 | // and DST_OFF. For powerpc64, this adds a referenc to the code |
| 6484 | // section of a function descriptor. |
| 6485 | |
| 6486 | template<int size, bool big_endian> |
| 6487 | void |
| 6488 | Target_powerpc<size, big_endian>::do_gc_add_reference( |
| 6489 | Symbol_table* symtab, |
| 6490 | Relobj* src_obj, |
| 6491 | unsigned int src_shndx, |
| 6492 | Relobj* dst_obj, |
| 6493 | unsigned int dst_shndx, |
| 6494 | Address dst_off) const |
| 6495 | { |
| 6496 | if (size != 64 || dst_obj->is_dynamic()) |
| 6497 | return; |
| 6498 | |
| 6499 | Powerpc_relobj<size, big_endian>* ppc_object |
| 6500 | = static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj); |
| 6501 | if (dst_shndx != 0 && dst_shndx == ppc_object->opd_shndx()) |
| 6502 | { |
| 6503 | if (ppc_object->opd_valid()) |
| 6504 | { |
| 6505 | dst_shndx = ppc_object->get_opd_ent(dst_off); |
| 6506 | symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx); |
| 6507 | } |
| 6508 | else |
| 6509 | { |
| 6510 | // If we haven't run scan_opd_relocs, we must delay |
| 6511 | // processing this function descriptor reference. |
| 6512 | ppc_object->add_reference(src_obj, src_shndx, dst_off); |
| 6513 | } |
| 6514 | } |
| 6515 | } |
| 6516 | |
| 6517 | // Add any special sections for this symbol to the gc work list. |
| 6518 | // For powerpc64, this adds the code section of a function |
| 6519 | // descriptor. |
| 6520 | |
| 6521 | template<int size, bool big_endian> |
| 6522 | void |
| 6523 | Target_powerpc<size, big_endian>::do_gc_mark_symbol( |
| 6524 | Symbol_table* symtab, |
| 6525 | Symbol* sym) const |
| 6526 | { |
| 6527 | if (size == 64) |
| 6528 | { |
| 6529 | Powerpc_relobj<size, big_endian>* ppc_object |
| 6530 | = static_cast<Powerpc_relobj<size, big_endian>*>(sym->object()); |
| 6531 | bool is_ordinary; |
| 6532 | unsigned int shndx = sym->shndx(&is_ordinary); |
| 6533 | if (is_ordinary && shndx != 0 && shndx == ppc_object->opd_shndx()) |
| 6534 | { |
| 6535 | Sized_symbol<size>* gsym = symtab->get_sized_symbol<size>(sym); |
| 6536 | Address dst_off = gsym->value(); |
| 6537 | if (ppc_object->opd_valid()) |
| 6538 | { |
| 6539 | unsigned int dst_indx = ppc_object->get_opd_ent(dst_off); |
| 6540 | symtab->gc()->worklist().push_back(Section_id(ppc_object, |
| 6541 | dst_indx)); |
| 6542 | } |
| 6543 | else |
| 6544 | ppc_object->add_gc_mark(dst_off); |
| 6545 | } |
| 6546 | } |
| 6547 | } |
| 6548 | |
| 6549 | // For a symbol location in .opd, set LOC to the location of the |
| 6550 | // function entry. |
| 6551 | |
| 6552 | template<int size, bool big_endian> |
| 6553 | void |
| 6554 | Target_powerpc<size, big_endian>::do_function_location( |
| 6555 | Symbol_location* loc) const |
| 6556 | { |
| 6557 | if (size == 64 && loc->shndx != 0) |
| 6558 | { |
| 6559 | if (loc->object->is_dynamic()) |
| 6560 | { |
| 6561 | Powerpc_dynobj<size, big_endian>* ppc_object |
| 6562 | = static_cast<Powerpc_dynobj<size, big_endian>*>(loc->object); |
| 6563 | if (loc->shndx == ppc_object->opd_shndx()) |
| 6564 | { |
| 6565 | Address dest_off; |
| 6566 | Address off = loc->offset - ppc_object->opd_address(); |
| 6567 | loc->shndx = ppc_object->get_opd_ent(off, &dest_off); |
| 6568 | loc->offset = dest_off; |
| 6569 | } |
| 6570 | } |
| 6571 | else |
| 6572 | { |
| 6573 | const Powerpc_relobj<size, big_endian>* ppc_object |
| 6574 | = static_cast<const Powerpc_relobj<size, big_endian>*>(loc->object); |
| 6575 | if (loc->shndx == ppc_object->opd_shndx()) |
| 6576 | { |
| 6577 | Address dest_off; |
| 6578 | loc->shndx = ppc_object->get_opd_ent(loc->offset, &dest_off); |
| 6579 | loc->offset = dest_off; |
| 6580 | } |
| 6581 | } |
| 6582 | } |
| 6583 | } |
| 6584 | |
| 6585 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
| 6586 | // compiled with -fsplit-stack. The function calls non-split-stack |
| 6587 | // code. Change the function to ensure it has enough stack space to |
| 6588 | // call some random function. |
| 6589 | |
| 6590 | template<int size, bool big_endian> |
| 6591 | void |
| 6592 | Target_powerpc<size, big_endian>::do_calls_non_split( |
| 6593 | Relobj* object, |
| 6594 | unsigned int shndx, |
| 6595 | section_offset_type fnoffset, |
| 6596 | section_size_type fnsize, |
| 6597 | const unsigned char* prelocs, |
| 6598 | size_t reloc_count, |
| 6599 | unsigned char* view, |
| 6600 | section_size_type view_size, |
| 6601 | std::string* from, |
| 6602 | std::string* to) const |
| 6603 | { |
| 6604 | // 32-bit not supported. |
| 6605 | if (size == 32) |
| 6606 | { |
| 6607 | // warn |
| 6608 | Target::do_calls_non_split(object, shndx, fnoffset, fnsize, |
| 6609 | prelocs, reloc_count, view, view_size, |
| 6610 | from, to); |
| 6611 | return; |
| 6612 | } |
| 6613 | |
| 6614 | // The function always starts with |
| 6615 | // ld %r0,-0x7000-64(%r13) # tcbhead_t.__private_ss |
| 6616 | // addis %r12,%r1,-allocate@ha |
| 6617 | // addi %r12,%r12,-allocate@l |
| 6618 | // cmpld %r12,%r0 |
| 6619 | // but note that the addis or addi may be replaced with a nop |
| 6620 | |
| 6621 | unsigned char *entry = view + fnoffset; |
| 6622 | uint32_t insn = elfcpp::Swap<32, big_endian>::readval(entry); |
| 6623 | |
| 6624 | if ((insn & 0xffff0000) == addis_2_12) |
| 6625 | { |
| 6626 | /* Skip ELFv2 global entry code. */ |
| 6627 | entry += 8; |
| 6628 | insn = elfcpp::Swap<32, big_endian>::readval(entry); |
| 6629 | } |
| 6630 | |
| 6631 | unsigned char *pinsn = entry; |
| 6632 | bool ok = false; |
| 6633 | const uint32_t ld_private_ss = 0xe80d8fc0; |
| 6634 | if (insn == ld_private_ss) |
| 6635 | { |
| 6636 | int32_t allocate = 0; |
| 6637 | while (1) |
| 6638 | { |
| 6639 | pinsn += 4; |
| 6640 | insn = elfcpp::Swap<32, big_endian>::readval(pinsn); |
| 6641 | if ((insn & 0xffff0000) == addis_12_1) |
| 6642 | allocate += (insn & 0xffff) << 16; |
| 6643 | else if ((insn & 0xffff0000) == addi_12_1 |
| 6644 | || (insn & 0xffff0000) == addi_12_12) |
| 6645 | allocate += ((insn & 0xffff) ^ 0x8000) - 0x8000; |
| 6646 | else if (insn != nop) |
| 6647 | break; |
| 6648 | } |
| 6649 | if (insn == cmpld_7_12_0 && pinsn == entry + 12) |
| 6650 | { |
| 6651 | int extra = parameters->options().split_stack_adjust_size(); |
| 6652 | allocate -= extra; |
| 6653 | if (allocate >= 0 || extra < 0) |
| 6654 | { |
| 6655 | object->error(_("split-stack stack size overflow at " |
| 6656 | "section %u offset %0zx"), |
| 6657 | shndx, static_cast<size_t>(fnoffset)); |
| 6658 | return; |
| 6659 | } |
| 6660 | pinsn = entry + 4; |
| 6661 | insn = addis_12_1 | (((allocate + 0x8000) >> 16) & 0xffff); |
| 6662 | if (insn != addis_12_1) |
| 6663 | { |
| 6664 | elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); |
| 6665 | pinsn += 4; |
| 6666 | insn = addi_12_12 | (allocate & 0xffff); |
| 6667 | if (insn != addi_12_12) |
| 6668 | { |
| 6669 | elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); |
| 6670 | pinsn += 4; |
| 6671 | } |
| 6672 | } |
| 6673 | else |
| 6674 | { |
| 6675 | insn = addi_12_1 | (allocate & 0xffff); |
| 6676 | elfcpp::Swap<32, big_endian>::writeval(pinsn, insn); |
| 6677 | pinsn += 4; |
| 6678 | } |
| 6679 | if (pinsn != entry + 12) |
| 6680 | elfcpp::Swap<32, big_endian>::writeval(pinsn, nop); |
| 6681 | |
| 6682 | ok = true; |
| 6683 | } |
| 6684 | } |
| 6685 | |
| 6686 | if (!ok) |
| 6687 | { |
| 6688 | if (!object->has_no_split_stack()) |
| 6689 | object->error(_("failed to match split-stack sequence at " |
| 6690 | "section %u offset %0zx"), |
| 6691 | shndx, static_cast<size_t>(fnoffset)); |
| 6692 | } |
| 6693 | } |
| 6694 | |
| 6695 | // Scan relocations for a section. |
| 6696 | |
| 6697 | template<int size, bool big_endian> |
| 6698 | void |
| 6699 | Target_powerpc<size, big_endian>::scan_relocs( |
| 6700 | Symbol_table* symtab, |
| 6701 | Layout* layout, |
| 6702 | Sized_relobj_file<size, big_endian>* object, |
| 6703 | unsigned int data_shndx, |
| 6704 | unsigned int sh_type, |
| 6705 | const unsigned char* prelocs, |
| 6706 | size_t reloc_count, |
| 6707 | Output_section* output_section, |
| 6708 | bool needs_special_offset_handling, |
| 6709 | size_t local_symbol_count, |
| 6710 | const unsigned char* plocal_symbols) |
| 6711 | { |
| 6712 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 6713 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 6714 | Classify_reloc; |
| 6715 | |
| 6716 | if (sh_type == elfcpp::SHT_REL) |
| 6717 | { |
| 6718 | gold_error(_("%s: unsupported REL reloc section"), |
| 6719 | object->name().c_str()); |
| 6720 | return; |
| 6721 | } |
| 6722 | |
| 6723 | gold::scan_relocs<size, big_endian, Powerpc, Scan, Classify_reloc>( |
| 6724 | symtab, |
| 6725 | layout, |
| 6726 | this, |
| 6727 | object, |
| 6728 | data_shndx, |
| 6729 | prelocs, |
| 6730 | reloc_count, |
| 6731 | output_section, |
| 6732 | needs_special_offset_handling, |
| 6733 | local_symbol_count, |
| 6734 | plocal_symbols); |
| 6735 | } |
| 6736 | |
| 6737 | // Functor class for processing the global symbol table. |
| 6738 | // Removes symbols defined on discarded opd entries. |
| 6739 | |
| 6740 | template<bool big_endian> |
| 6741 | class Global_symbol_visitor_opd |
| 6742 | { |
| 6743 | public: |
| 6744 | Global_symbol_visitor_opd() |
| 6745 | { } |
| 6746 | |
| 6747 | void |
| 6748 | operator()(Sized_symbol<64>* sym) |
| 6749 | { |
| 6750 | if (sym->has_symtab_index() |
| 6751 | || sym->source() != Symbol::FROM_OBJECT |
| 6752 | || !sym->in_real_elf()) |
| 6753 | return; |
| 6754 | |
| 6755 | if (sym->object()->is_dynamic()) |
| 6756 | return; |
| 6757 | |
| 6758 | Powerpc_relobj<64, big_endian>* symobj |
| 6759 | = static_cast<Powerpc_relobj<64, big_endian>*>(sym->object()); |
| 6760 | if (symobj->opd_shndx() == 0) |
| 6761 | return; |
| 6762 | |
| 6763 | bool is_ordinary; |
| 6764 | unsigned int shndx = sym->shndx(&is_ordinary); |
| 6765 | if (shndx == symobj->opd_shndx() |
| 6766 | && symobj->get_opd_discard(sym->value())) |
| 6767 | { |
| 6768 | sym->set_undefined(); |
| 6769 | sym->set_visibility(elfcpp::STV_DEFAULT); |
| 6770 | sym->set_is_defined_in_discarded_section(); |
| 6771 | sym->set_symtab_index(-1U); |
| 6772 | } |
| 6773 | } |
| 6774 | }; |
| 6775 | |
| 6776 | template<int size, bool big_endian> |
| 6777 | void |
| 6778 | Target_powerpc<size, big_endian>::define_save_restore_funcs( |
| 6779 | Layout* layout, |
| 6780 | Symbol_table* symtab) |
| 6781 | { |
| 6782 | if (size == 64) |
| 6783 | { |
| 6784 | Output_data_save_res<size, big_endian>* savres |
| 6785 | = new Output_data_save_res<size, big_endian>(symtab); |
| 6786 | this->savres_section_ = savres; |
| 6787 | layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, |
| 6788 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, |
| 6789 | savres, ORDER_TEXT, false); |
| 6790 | } |
| 6791 | } |
| 6792 | |
| 6793 | // Sort linker created .got section first (for the header), then input |
| 6794 | // sections belonging to files using small model code. |
| 6795 | |
| 6796 | template<bool big_endian> |
| 6797 | class Sort_toc_sections |
| 6798 | { |
| 6799 | public: |
| 6800 | bool |
| 6801 | operator()(const Output_section::Input_section& is1, |
| 6802 | const Output_section::Input_section& is2) const |
| 6803 | { |
| 6804 | if (!is1.is_input_section() && is2.is_input_section()) |
| 6805 | return true; |
| 6806 | bool small1 |
| 6807 | = (is1.is_input_section() |
| 6808 | && (static_cast<const Powerpc_relobj<64, big_endian>*>(is1.relobj()) |
| 6809 | ->has_small_toc_reloc())); |
| 6810 | bool small2 |
| 6811 | = (is2.is_input_section() |
| 6812 | && (static_cast<const Powerpc_relobj<64, big_endian>*>(is2.relobj()) |
| 6813 | ->has_small_toc_reloc())); |
| 6814 | return small1 && !small2; |
| 6815 | } |
| 6816 | }; |
| 6817 | |
| 6818 | // Finalize the sections. |
| 6819 | |
| 6820 | template<int size, bool big_endian> |
| 6821 | void |
| 6822 | Target_powerpc<size, big_endian>::do_finalize_sections( |
| 6823 | Layout* layout, |
| 6824 | const Input_objects*, |
| 6825 | Symbol_table* symtab) |
| 6826 | { |
| 6827 | if (parameters->doing_static_link()) |
| 6828 | { |
| 6829 | // At least some versions of glibc elf-init.o have a strong |
| 6830 | // reference to __rela_iplt marker syms. A weak ref would be |
| 6831 | // better.. |
| 6832 | if (this->iplt_ != NULL) |
| 6833 | { |
| 6834 | Reloc_section* rel = this->iplt_->rel_plt(); |
| 6835 | symtab->define_in_output_data("__rela_iplt_start", NULL, |
| 6836 | Symbol_table::PREDEFINED, rel, 0, 0, |
| 6837 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 6838 | elfcpp::STV_HIDDEN, 0, false, true); |
| 6839 | symtab->define_in_output_data("__rela_iplt_end", NULL, |
| 6840 | Symbol_table::PREDEFINED, rel, 0, 0, |
| 6841 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 6842 | elfcpp::STV_HIDDEN, 0, true, true); |
| 6843 | } |
| 6844 | else |
| 6845 | { |
| 6846 | symtab->define_as_constant("__rela_iplt_start", NULL, |
| 6847 | Symbol_table::PREDEFINED, 0, 0, |
| 6848 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 6849 | elfcpp::STV_HIDDEN, 0, true, false); |
| 6850 | symtab->define_as_constant("__rela_iplt_end", NULL, |
| 6851 | Symbol_table::PREDEFINED, 0, 0, |
| 6852 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 6853 | elfcpp::STV_HIDDEN, 0, true, false); |
| 6854 | } |
| 6855 | } |
| 6856 | |
| 6857 | if (size == 64) |
| 6858 | { |
| 6859 | typedef Global_symbol_visitor_opd<big_endian> Symbol_visitor; |
| 6860 | symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor()); |
| 6861 | |
| 6862 | if (!parameters->options().relocatable()) |
| 6863 | { |
| 6864 | this->define_save_restore_funcs(layout, symtab); |
| 6865 | |
| 6866 | // Annoyingly, we need to make these sections now whether or |
| 6867 | // not we need them. If we delay until do_relax then we |
| 6868 | // need to mess with the relaxation machinery checkpointing. |
| 6869 | this->got_section(symtab, layout); |
| 6870 | this->make_brlt_section(layout); |
| 6871 | |
| 6872 | if (parameters->options().toc_sort()) |
| 6873 | { |
| 6874 | Output_section* os = this->got_->output_section(); |
| 6875 | if (os != NULL && os->input_sections().size() > 1) |
| 6876 | std::stable_sort(os->input_sections().begin(), |
| 6877 | os->input_sections().end(), |
| 6878 | Sort_toc_sections<big_endian>()); |
| 6879 | } |
| 6880 | } |
| 6881 | } |
| 6882 | |
| 6883 | // Fill in some more dynamic tags. |
| 6884 | Output_data_dynamic* odyn = layout->dynamic_data(); |
| 6885 | if (odyn != NULL) |
| 6886 | { |
| 6887 | const Reloc_section* rel_plt = (this->plt_ == NULL |
| 6888 | ? NULL |
| 6889 | : this->plt_->rel_plt()); |
| 6890 | layout->add_target_dynamic_tags(false, this->plt_, rel_plt, |
| 6891 | this->rela_dyn_, true, size == 32); |
| 6892 | |
| 6893 | if (size == 32) |
| 6894 | { |
| 6895 | if (this->got_ != NULL) |
| 6896 | { |
| 6897 | this->got_->finalize_data_size(); |
| 6898 | odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT, |
| 6899 | this->got_, this->got_->g_o_t()); |
| 6900 | } |
| 6901 | } |
| 6902 | else |
| 6903 | { |
| 6904 | if (this->glink_ != NULL) |
| 6905 | { |
| 6906 | this->glink_->finalize_data_size(); |
| 6907 | odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK, |
| 6908 | this->glink_, |
| 6909 | (this->glink_->pltresolve_size |
| 6910 | - 32)); |
| 6911 | } |
| 6912 | } |
| 6913 | } |
| 6914 | |
| 6915 | // Emit any relocs we saved in an attempt to avoid generating COPY |
| 6916 | // relocs. |
| 6917 | if (this->copy_relocs_.any_saved_relocs()) |
| 6918 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); |
| 6919 | } |
| 6920 | |
| 6921 | // Return TRUE iff INSN is one we expect on a _LO variety toc/got |
| 6922 | // reloc. |
| 6923 | |
| 6924 | static bool |
| 6925 | ok_lo_toc_insn(uint32_t insn) |
| 6926 | { |
| 6927 | return ((insn & (0x3f << 26)) == 14u << 26 /* addi */ |
| 6928 | || (insn & (0x3f << 26)) == 32u << 26 /* lwz */ |
| 6929 | || (insn & (0x3f << 26)) == 34u << 26 /* lbz */ |
| 6930 | || (insn & (0x3f << 26)) == 36u << 26 /* stw */ |
| 6931 | || (insn & (0x3f << 26)) == 38u << 26 /* stb */ |
| 6932 | || (insn & (0x3f << 26)) == 40u << 26 /* lhz */ |
| 6933 | || (insn & (0x3f << 26)) == 42u << 26 /* lha */ |
| 6934 | || (insn & (0x3f << 26)) == 44u << 26 /* sth */ |
| 6935 | || (insn & (0x3f << 26)) == 46u << 26 /* lmw */ |
| 6936 | || (insn & (0x3f << 26)) == 47u << 26 /* stmw */ |
| 6937 | || (insn & (0x3f << 26)) == 48u << 26 /* lfs */ |
| 6938 | || (insn & (0x3f << 26)) == 50u << 26 /* lfd */ |
| 6939 | || (insn & (0x3f << 26)) == 52u << 26 /* stfs */ |
| 6940 | || (insn & (0x3f << 26)) == 54u << 26 /* stfd */ |
| 6941 | || ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */ |
| 6942 | && (insn & 3) != 1) |
| 6943 | || ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */ |
| 6944 | && ((insn & 3) == 0 || (insn & 3) == 3)) |
| 6945 | || (insn & (0x3f << 26)) == 12u << 26 /* addic */); |
| 6946 | } |
| 6947 | |
| 6948 | // Return the value to use for a branch relocation. |
| 6949 | |
| 6950 | template<int size, bool big_endian> |
| 6951 | bool |
| 6952 | Target_powerpc<size, big_endian>::symval_for_branch( |
| 6953 | const Symbol_table* symtab, |
| 6954 | const Sized_symbol<size>* gsym, |
| 6955 | Powerpc_relobj<size, big_endian>* object, |
| 6956 | Address *value, |
| 6957 | unsigned int *dest_shndx) |
| 6958 | { |
| 6959 | if (size == 32 || this->abiversion() >= 2) |
| 6960 | gold_unreachable(); |
| 6961 | *dest_shndx = 0; |
| 6962 | |
| 6963 | // If the symbol is defined in an opd section, ie. is a function |
| 6964 | // descriptor, use the function descriptor code entry address |
| 6965 | Powerpc_relobj<size, big_endian>* symobj = object; |
| 6966 | if (gsym != NULL |
| 6967 | && gsym->source() != Symbol::FROM_OBJECT) |
| 6968 | return true; |
| 6969 | if (gsym != NULL) |
| 6970 | symobj = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object()); |
| 6971 | unsigned int shndx = symobj->opd_shndx(); |
| 6972 | if (shndx == 0) |
| 6973 | return true; |
| 6974 | Address opd_addr = symobj->get_output_section_offset(shndx); |
| 6975 | if (opd_addr == invalid_address) |
| 6976 | return true; |
| 6977 | opd_addr += symobj->output_section_address(shndx); |
| 6978 | if (*value >= opd_addr && *value < opd_addr + symobj->section_size(shndx)) |
| 6979 | { |
| 6980 | Address sec_off; |
| 6981 | *dest_shndx = symobj->get_opd_ent(*value - opd_addr, &sec_off); |
| 6982 | if (symtab->is_section_folded(symobj, *dest_shndx)) |
| 6983 | { |
| 6984 | Section_id folded |
| 6985 | = symtab->icf()->get_folded_section(symobj, *dest_shndx); |
| 6986 | symobj = static_cast<Powerpc_relobj<size, big_endian>*>(folded.first); |
| 6987 | *dest_shndx = folded.second; |
| 6988 | } |
| 6989 | Address sec_addr = symobj->get_output_section_offset(*dest_shndx); |
| 6990 | if (sec_addr == invalid_address) |
| 6991 | return false; |
| 6992 | |
| 6993 | sec_addr += symobj->output_section(*dest_shndx)->address(); |
| 6994 | *value = sec_addr + sec_off; |
| 6995 | } |
| 6996 | return true; |
| 6997 | } |
| 6998 | |
| 6999 | // Perform a relocation. |
| 7000 | |
| 7001 | template<int size, bool big_endian> |
| 7002 | inline bool |
| 7003 | Target_powerpc<size, big_endian>::Relocate::relocate( |
| 7004 | const Relocate_info<size, big_endian>* relinfo, |
| 7005 | unsigned int, |
| 7006 | Target_powerpc* target, |
| 7007 | Output_section* os, |
| 7008 | size_t relnum, |
| 7009 | const unsigned char* preloc, |
| 7010 | const Sized_symbol<size>* gsym, |
| 7011 | const Symbol_value<size>* psymval, |
| 7012 | unsigned char* view, |
| 7013 | Address address, |
| 7014 | section_size_type view_size) |
| 7015 | { |
| 7016 | if (view == NULL) |
| 7017 | return true; |
| 7018 | |
| 7019 | const elfcpp::Rela<size, big_endian> rela(preloc); |
| 7020 | unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info()); |
| 7021 | switch (this->maybe_skip_tls_get_addr_call(r_type, gsym)) |
| 7022 | { |
| 7023 | case Track_tls::NOT_EXPECTED: |
| 7024 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7025 | _("__tls_get_addr call lacks marker reloc")); |
| 7026 | break; |
| 7027 | case Track_tls::EXPECTED: |
| 7028 | // We have already complained. |
| 7029 | break; |
| 7030 | case Track_tls::SKIP: |
| 7031 | return true; |
| 7032 | case Track_tls::NORMAL: |
| 7033 | break; |
| 7034 | } |
| 7035 | |
| 7036 | typedef Powerpc_relocate_functions<size, big_endian> Reloc; |
| 7037 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn; |
| 7038 | typedef typename Reloc_types<elfcpp::SHT_RELA, |
| 7039 | size, big_endian>::Reloc Reltype; |
| 7040 | // Offset from start of insn to d-field reloc. |
| 7041 | const int d_offset = big_endian ? 2 : 0; |
| 7042 | |
| 7043 | Powerpc_relobj<size, big_endian>* const object |
| 7044 | = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); |
| 7045 | Address value = 0; |
| 7046 | bool has_stub_value = false; |
| 7047 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7048 | if ((gsym != NULL |
| 7049 | ? gsym->use_plt_offset(Scan::get_reference_flags(r_type, target)) |
| 7050 | : object->local_has_plt_offset(r_sym)) |
| 7051 | && (!psymval->is_ifunc_symbol() |
| 7052 | || Scan::reloc_needs_plt_for_ifunc(target, object, r_type, false))) |
| 7053 | { |
| 7054 | if (size == 64 |
| 7055 | && gsym != NULL |
| 7056 | && target->abiversion() >= 2 |
| 7057 | && !parameters->options().output_is_position_independent() |
| 7058 | && !is_branch_reloc(r_type)) |
| 7059 | { |
| 7060 | Address off = target->glink_section()->find_global_entry(gsym); |
| 7061 | if (off != invalid_address) |
| 7062 | { |
| 7063 | value = target->glink_section()->global_entry_address() + off; |
| 7064 | has_stub_value = true; |
| 7065 | } |
| 7066 | } |
| 7067 | else |
| 7068 | { |
| 7069 | Stub_table<size, big_endian>* stub_table |
| 7070 | = object->stub_table(relinfo->data_shndx); |
| 7071 | if (stub_table == NULL) |
| 7072 | { |
| 7073 | // This is a ref from a data section to an ifunc symbol. |
| 7074 | if (target->stub_tables().size() != 0) |
| 7075 | stub_table = target->stub_tables()[0]; |
| 7076 | } |
| 7077 | if (stub_table != NULL) |
| 7078 | { |
| 7079 | Address off; |
| 7080 | if (gsym != NULL) |
| 7081 | off = stub_table->find_plt_call_entry(object, gsym, r_type, |
| 7082 | rela.get_r_addend()); |
| 7083 | else |
| 7084 | off = stub_table->find_plt_call_entry(object, r_sym, r_type, |
| 7085 | rela.get_r_addend()); |
| 7086 | if (off != invalid_address) |
| 7087 | { |
| 7088 | value = stub_table->stub_address() + off; |
| 7089 | has_stub_value = true; |
| 7090 | } |
| 7091 | } |
| 7092 | } |
| 7093 | // We don't care too much about bogus debug references to |
| 7094 | // non-local functions, but otherwise there had better be a plt |
| 7095 | // call stub or global entry stub as appropriate. |
| 7096 | gold_assert(has_stub_value || !(os->flags() & elfcpp::SHF_ALLOC)); |
| 7097 | } |
| 7098 | |
| 7099 | if (r_type == elfcpp::R_POWERPC_GOT16 |
| 7100 | || r_type == elfcpp::R_POWERPC_GOT16_LO |
| 7101 | || r_type == elfcpp::R_POWERPC_GOT16_HI |
| 7102 | || r_type == elfcpp::R_POWERPC_GOT16_HA |
| 7103 | || r_type == elfcpp::R_PPC64_GOT16_DS |
| 7104 | || r_type == elfcpp::R_PPC64_GOT16_LO_DS) |
| 7105 | { |
| 7106 | if (gsym != NULL) |
| 7107 | { |
| 7108 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| 7109 | value = gsym->got_offset(GOT_TYPE_STANDARD); |
| 7110 | } |
| 7111 | else |
| 7112 | { |
| 7113 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7114 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
| 7115 | value = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); |
| 7116 | } |
| 7117 | value -= target->got_section()->got_base_offset(object); |
| 7118 | } |
| 7119 | else if (r_type == elfcpp::R_PPC64_TOC) |
| 7120 | { |
| 7121 | value = (target->got_section()->output_section()->address() |
| 7122 | + object->toc_base_offset()); |
| 7123 | } |
| 7124 | else if (gsym != NULL |
| 7125 | && (r_type == elfcpp::R_POWERPC_REL24 |
| 7126 | || r_type == elfcpp::R_PPC_PLTREL24) |
| 7127 | && has_stub_value) |
| 7128 | { |
| 7129 | if (size == 64) |
| 7130 | { |
| 7131 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| 7132 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 7133 | bool can_plt_call = false; |
| 7134 | if (rela.get_r_offset() + 8 <= view_size) |
| 7135 | { |
| 7136 | Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv); |
| 7137 | Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1); |
| 7138 | if ((insn & 1) != 0 |
| 7139 | && (insn2 == nop |
| 7140 | || insn2 == cror_15_15_15 || insn2 == cror_31_31_31)) |
| 7141 | { |
| 7142 | elfcpp::Swap<32, big_endian>:: |
| 7143 | writeval(wv + 1, ld_2_1 + target->stk_toc()); |
| 7144 | can_plt_call = true; |
| 7145 | } |
| 7146 | } |
| 7147 | if (!can_plt_call) |
| 7148 | { |
| 7149 | // If we don't have a branch and link followed by a nop, |
| 7150 | // we can't go via the plt because there is no place to |
| 7151 | // put a toc restoring instruction. |
| 7152 | // Unless we know we won't be returning. |
| 7153 | if (strcmp(gsym->name(), "__libc_start_main") == 0) |
| 7154 | can_plt_call = true; |
| 7155 | } |
| 7156 | if (!can_plt_call) |
| 7157 | { |
| 7158 | // g++ as of 20130507 emits self-calls without a |
| 7159 | // following nop. This is arguably wrong since we have |
| 7160 | // conflicting information. On the one hand a global |
| 7161 | // symbol and on the other a local call sequence, but |
| 7162 | // don't error for this special case. |
| 7163 | // It isn't possible to cheaply verify we have exactly |
| 7164 | // such a call. Allow all calls to the same section. |
| 7165 | bool ok = false; |
| 7166 | Address code = value; |
| 7167 | if (gsym->source() == Symbol::FROM_OBJECT |
| 7168 | && gsym->object() == object) |
| 7169 | { |
| 7170 | unsigned int dest_shndx = 0; |
| 7171 | if (target->abiversion() < 2) |
| 7172 | { |
| 7173 | Address addend = rela.get_r_addend(); |
| 7174 | code = psymval->value(object, addend); |
| 7175 | target->symval_for_branch(relinfo->symtab, gsym, object, |
| 7176 | &code, &dest_shndx); |
| 7177 | } |
| 7178 | bool is_ordinary; |
| 7179 | if (dest_shndx == 0) |
| 7180 | dest_shndx = gsym->shndx(&is_ordinary); |
| 7181 | ok = dest_shndx == relinfo->data_shndx; |
| 7182 | } |
| 7183 | if (!ok) |
| 7184 | { |
| 7185 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7186 | _("call lacks nop, can't restore toc; " |
| 7187 | "recompile with -fPIC")); |
| 7188 | value = code; |
| 7189 | } |
| 7190 | } |
| 7191 | } |
| 7192 | } |
| 7193 | else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 7194 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO |
| 7195 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI |
| 7196 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) |
| 7197 | { |
| 7198 | // First instruction of a global dynamic sequence, arg setup insn. |
| 7199 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 7200 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 7201 | enum Got_type got_type = GOT_TYPE_STANDARD; |
| 7202 | if (tls_type == tls::TLSOPT_NONE) |
| 7203 | got_type = GOT_TYPE_TLSGD; |
| 7204 | else if (tls_type == tls::TLSOPT_TO_IE) |
| 7205 | got_type = GOT_TYPE_TPREL; |
| 7206 | if (got_type != GOT_TYPE_STANDARD) |
| 7207 | { |
| 7208 | if (gsym != NULL) |
| 7209 | { |
| 7210 | gold_assert(gsym->has_got_offset(got_type)); |
| 7211 | value = gsym->got_offset(got_type); |
| 7212 | } |
| 7213 | else |
| 7214 | { |
| 7215 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7216 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
| 7217 | value = object->local_got_offset(r_sym, got_type); |
| 7218 | } |
| 7219 | value -= target->got_section()->got_base_offset(object); |
| 7220 | } |
| 7221 | if (tls_type == tls::TLSOPT_TO_IE) |
| 7222 | { |
| 7223 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 7224 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| 7225 | { |
| 7226 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7227 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7228 | insn &= (1 << 26) - (1 << 16); // extract rt,ra from addi |
| 7229 | if (size == 32) |
| 7230 | insn |= 32 << 26; // lwz |
| 7231 | else |
| 7232 | insn |= 58 << 26; // ld |
| 7233 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7234 | } |
| 7235 | r_type += (elfcpp::R_POWERPC_GOT_TPREL16 |
| 7236 | - elfcpp::R_POWERPC_GOT_TLSGD16); |
| 7237 | } |
| 7238 | else if (tls_type == tls::TLSOPT_TO_LE) |
| 7239 | { |
| 7240 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 7241 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| 7242 | { |
| 7243 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7244 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7245 | insn &= (1 << 26) - (1 << 21); // extract rt |
| 7246 | if (size == 32) |
| 7247 | insn |= addis_0_2; |
| 7248 | else |
| 7249 | insn |= addis_0_13; |
| 7250 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7251 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 7252 | value = psymval->value(object, rela.get_r_addend()); |
| 7253 | } |
| 7254 | else |
| 7255 | { |
| 7256 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7257 | Insn insn = nop; |
| 7258 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7259 | r_type = elfcpp::R_POWERPC_NONE; |
| 7260 | } |
| 7261 | } |
| 7262 | } |
| 7263 | else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 7264 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO |
| 7265 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI |
| 7266 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) |
| 7267 | { |
| 7268 | // First instruction of a local dynamic sequence, arg setup insn. |
| 7269 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 7270 | if (tls_type == tls::TLSOPT_NONE) |
| 7271 | { |
| 7272 | value = target->tlsld_got_offset(); |
| 7273 | value -= target->got_section()->got_base_offset(object); |
| 7274 | } |
| 7275 | else |
| 7276 | { |
| 7277 | gold_assert(tls_type == tls::TLSOPT_TO_LE); |
| 7278 | if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 7279 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) |
| 7280 | { |
| 7281 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7282 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7283 | insn &= (1 << 26) - (1 << 21); // extract rt |
| 7284 | if (size == 32) |
| 7285 | insn |= addis_0_2; |
| 7286 | else |
| 7287 | insn |= addis_0_13; |
| 7288 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7289 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 7290 | value = dtp_offset; |
| 7291 | } |
| 7292 | else |
| 7293 | { |
| 7294 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7295 | Insn insn = nop; |
| 7296 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7297 | r_type = elfcpp::R_POWERPC_NONE; |
| 7298 | } |
| 7299 | } |
| 7300 | } |
| 7301 | else if (r_type == elfcpp::R_POWERPC_GOT_DTPREL16 |
| 7302 | || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_LO |
| 7303 | || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HI |
| 7304 | || r_type == elfcpp::R_POWERPC_GOT_DTPREL16_HA) |
| 7305 | { |
| 7306 | // Accesses relative to a local dynamic sequence address, |
| 7307 | // no optimisation here. |
| 7308 | if (gsym != NULL) |
| 7309 | { |
| 7310 | gold_assert(gsym->has_got_offset(GOT_TYPE_DTPREL)); |
| 7311 | value = gsym->got_offset(GOT_TYPE_DTPREL); |
| 7312 | } |
| 7313 | else |
| 7314 | { |
| 7315 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7316 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_DTPREL)); |
| 7317 | value = object->local_got_offset(r_sym, GOT_TYPE_DTPREL); |
| 7318 | } |
| 7319 | value -= target->got_section()->got_base_offset(object); |
| 7320 | } |
| 7321 | else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 7322 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO |
| 7323 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI |
| 7324 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) |
| 7325 | { |
| 7326 | // First instruction of initial exec sequence. |
| 7327 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 7328 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| 7329 | if (tls_type == tls::TLSOPT_NONE) |
| 7330 | { |
| 7331 | if (gsym != NULL) |
| 7332 | { |
| 7333 | gold_assert(gsym->has_got_offset(GOT_TYPE_TPREL)); |
| 7334 | value = gsym->got_offset(GOT_TYPE_TPREL); |
| 7335 | } |
| 7336 | else |
| 7337 | { |
| 7338 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7339 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_TPREL)); |
| 7340 | value = object->local_got_offset(r_sym, GOT_TYPE_TPREL); |
| 7341 | } |
| 7342 | value -= target->got_section()->got_base_offset(object); |
| 7343 | } |
| 7344 | else |
| 7345 | { |
| 7346 | gold_assert(tls_type == tls::TLSOPT_TO_LE); |
| 7347 | if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 7348 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) |
| 7349 | { |
| 7350 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7351 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7352 | insn &= (1 << 26) - (1 << 21); // extract rt from ld |
| 7353 | if (size == 32) |
| 7354 | insn |= addis_0_2; |
| 7355 | else |
| 7356 | insn |= addis_0_13; |
| 7357 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7358 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 7359 | value = psymval->value(object, rela.get_r_addend()); |
| 7360 | } |
| 7361 | else |
| 7362 | { |
| 7363 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7364 | Insn insn = nop; |
| 7365 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7366 | r_type = elfcpp::R_POWERPC_NONE; |
| 7367 | } |
| 7368 | } |
| 7369 | } |
| 7370 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 7371 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 7372 | { |
| 7373 | // Second instruction of a global dynamic sequence, |
| 7374 | // the __tls_get_addr call |
| 7375 | this->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset()); |
| 7376 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 7377 | const tls::Tls_optimization tls_type = target->optimize_tls_gd(final); |
| 7378 | if (tls_type != tls::TLSOPT_NONE) |
| 7379 | { |
| 7380 | if (tls_type == tls::TLSOPT_TO_IE) |
| 7381 | { |
| 7382 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 7383 | Insn insn = add_3_3_13; |
| 7384 | if (size == 32) |
| 7385 | insn = add_3_3_2; |
| 7386 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7387 | r_type = elfcpp::R_POWERPC_NONE; |
| 7388 | } |
| 7389 | else |
| 7390 | { |
| 7391 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 7392 | Insn insn = addi_3_3; |
| 7393 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7394 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 7395 | view += d_offset; |
| 7396 | value = psymval->value(object, rela.get_r_addend()); |
| 7397 | } |
| 7398 | this->skip_next_tls_get_addr_call(); |
| 7399 | } |
| 7400 | } |
| 7401 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 7402 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 7403 | { |
| 7404 | // Second instruction of a local dynamic sequence, |
| 7405 | // the __tls_get_addr call |
| 7406 | this->expect_tls_get_addr_call(relinfo, relnum, rela.get_r_offset()); |
| 7407 | const tls::Tls_optimization tls_type = target->optimize_tls_ld(); |
| 7408 | if (tls_type == tls::TLSOPT_TO_LE) |
| 7409 | { |
| 7410 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 7411 | Insn insn = addi_3_3; |
| 7412 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7413 | this->skip_next_tls_get_addr_call(); |
| 7414 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 7415 | view += d_offset; |
| 7416 | value = dtp_offset; |
| 7417 | } |
| 7418 | } |
| 7419 | else if (r_type == elfcpp::R_POWERPC_TLS) |
| 7420 | { |
| 7421 | // Second instruction of an initial exec sequence |
| 7422 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 7423 | const tls::Tls_optimization tls_type = target->optimize_tls_ie(final); |
| 7424 | if (tls_type == tls::TLSOPT_TO_LE) |
| 7425 | { |
| 7426 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 7427 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7428 | unsigned int reg = size == 32 ? 2 : 13; |
| 7429 | insn = at_tls_transform(insn, reg); |
| 7430 | gold_assert(insn != 0); |
| 7431 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7432 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 7433 | view += d_offset; |
| 7434 | value = psymval->value(object, rela.get_r_addend()); |
| 7435 | } |
| 7436 | } |
| 7437 | else if (!has_stub_value) |
| 7438 | { |
| 7439 | Address addend = 0; |
| 7440 | if (!(size == 32 && r_type == elfcpp::R_PPC_PLTREL24)) |
| 7441 | addend = rela.get_r_addend(); |
| 7442 | value = psymval->value(object, addend); |
| 7443 | if (size == 64 && is_branch_reloc(r_type)) |
| 7444 | { |
| 7445 | if (target->abiversion() >= 2) |
| 7446 | { |
| 7447 | if (gsym != NULL) |
| 7448 | value += object->ppc64_local_entry_offset(gsym); |
| 7449 | else |
| 7450 | value += object->ppc64_local_entry_offset(r_sym); |
| 7451 | } |
| 7452 | else |
| 7453 | { |
| 7454 | unsigned int dest_shndx; |
| 7455 | target->symval_for_branch(relinfo->symtab, gsym, object, |
| 7456 | &value, &dest_shndx); |
| 7457 | } |
| 7458 | } |
| 7459 | Address max_branch_offset = max_branch_delta(r_type); |
| 7460 | if (max_branch_offset != 0 |
| 7461 | && value - address + max_branch_offset >= 2 * max_branch_offset) |
| 7462 | { |
| 7463 | Stub_table<size, big_endian>* stub_table |
| 7464 | = object->stub_table(relinfo->data_shndx); |
| 7465 | if (stub_table != NULL) |
| 7466 | { |
| 7467 | Address off = stub_table->find_long_branch_entry(object, value); |
| 7468 | if (off != invalid_address) |
| 7469 | { |
| 7470 | value = (stub_table->stub_address() + stub_table->plt_size() |
| 7471 | + off); |
| 7472 | has_stub_value = true; |
| 7473 | } |
| 7474 | } |
| 7475 | } |
| 7476 | } |
| 7477 | |
| 7478 | switch (r_type) |
| 7479 | { |
| 7480 | case elfcpp::R_PPC64_REL64: |
| 7481 | case elfcpp::R_POWERPC_REL32: |
| 7482 | case elfcpp::R_POWERPC_REL24: |
| 7483 | case elfcpp::R_PPC_PLTREL24: |
| 7484 | case elfcpp::R_PPC_LOCAL24PC: |
| 7485 | case elfcpp::R_POWERPC_REL16: |
| 7486 | case elfcpp::R_POWERPC_REL16_LO: |
| 7487 | case elfcpp::R_POWERPC_REL16_HI: |
| 7488 | case elfcpp::R_POWERPC_REL16_HA: |
| 7489 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 7490 | case elfcpp::R_POWERPC_REL14: |
| 7491 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 7492 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 7493 | value -= address; |
| 7494 | break; |
| 7495 | |
| 7496 | case elfcpp::R_PPC64_TOC16: |
| 7497 | case elfcpp::R_PPC64_TOC16_LO: |
| 7498 | case elfcpp::R_PPC64_TOC16_HI: |
| 7499 | case elfcpp::R_PPC64_TOC16_HA: |
| 7500 | case elfcpp::R_PPC64_TOC16_DS: |
| 7501 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 7502 | // Subtract the TOC base address. |
| 7503 | value -= (target->got_section()->output_section()->address() |
| 7504 | + object->toc_base_offset()); |
| 7505 | break; |
| 7506 | |
| 7507 | case elfcpp::R_POWERPC_SECTOFF: |
| 7508 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 7509 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 7510 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 7511 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 7512 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 7513 | if (os != NULL) |
| 7514 | value -= os->address(); |
| 7515 | break; |
| 7516 | |
| 7517 | case elfcpp::R_PPC64_TPREL16_DS: |
| 7518 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 7519 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 7520 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 7521 | if (size != 64) |
| 7522 | // R_PPC_TLSGD, R_PPC_TLSLD, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HI |
| 7523 | break; |
| 7524 | case elfcpp::R_POWERPC_TPREL16: |
| 7525 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 7526 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 7527 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 7528 | case elfcpp::R_POWERPC_TPREL: |
| 7529 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 7530 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 7531 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 7532 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 7533 | // tls symbol values are relative to tls_segment()->vaddr() |
| 7534 | value -= tp_offset; |
| 7535 | break; |
| 7536 | |
| 7537 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 7538 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 7539 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 7540 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 7541 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 7542 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 7543 | if (size != 64) |
| 7544 | // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16, R_PPC_EMB_NADDR16_LO |
| 7545 | // R_PPC_EMB_NADDR16_HI, R_PPC_EMB_NADDR16_HA, R_PPC_EMB_SDAI16 |
| 7546 | break; |
| 7547 | case elfcpp::R_POWERPC_DTPREL16: |
| 7548 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 7549 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 7550 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 7551 | case elfcpp::R_POWERPC_DTPREL: |
| 7552 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 7553 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 7554 | // tls symbol values are relative to tls_segment()->vaddr() |
| 7555 | value -= dtp_offset; |
| 7556 | break; |
| 7557 | |
| 7558 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 7559 | if (gsym != NULL) |
| 7560 | value += object->ppc64_local_entry_offset(gsym); |
| 7561 | else |
| 7562 | value += object->ppc64_local_entry_offset(r_sym); |
| 7563 | break; |
| 7564 | |
| 7565 | default: |
| 7566 | break; |
| 7567 | } |
| 7568 | |
| 7569 | Insn branch_bit = 0; |
| 7570 | switch (r_type) |
| 7571 | { |
| 7572 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 7573 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 7574 | branch_bit = 1 << 21; |
| 7575 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 7576 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 7577 | { |
| 7578 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 7579 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7580 | insn &= ~(1 << 21); |
| 7581 | insn |= branch_bit; |
| 7582 | if (this->is_isa_v2) |
| 7583 | { |
| 7584 | // Set 'a' bit. This is 0b00010 in BO field for branch |
| 7585 | // on CR(BI) insns (BO == 001at or 011at), and 0b01000 |
| 7586 | // for branch on CTR insns (BO == 1a00t or 1a01t). |
| 7587 | if ((insn & (0x14 << 21)) == (0x04 << 21)) |
| 7588 | insn |= 0x02 << 21; |
| 7589 | else if ((insn & (0x14 << 21)) == (0x10 << 21)) |
| 7590 | insn |= 0x08 << 21; |
| 7591 | else |
| 7592 | break; |
| 7593 | } |
| 7594 | else |
| 7595 | { |
| 7596 | // Invert 'y' bit if not the default. |
| 7597 | if (static_cast<Signed_address>(value) < 0) |
| 7598 | insn ^= 1 << 21; |
| 7599 | } |
| 7600 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7601 | } |
| 7602 | break; |
| 7603 | |
| 7604 | default: |
| 7605 | break; |
| 7606 | } |
| 7607 | |
| 7608 | if (size == 64) |
| 7609 | { |
| 7610 | // Multi-instruction sequences that access the TOC can be |
| 7611 | // optimized, eg. addis ra,r2,0; addi rb,ra,x; |
| 7612 | // to nop; addi rb,r2,x; |
| 7613 | switch (r_type) |
| 7614 | { |
| 7615 | default: |
| 7616 | break; |
| 7617 | |
| 7618 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 7619 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 7620 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 7621 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 7622 | case elfcpp::R_POWERPC_GOT16_HA: |
| 7623 | case elfcpp::R_PPC64_TOC16_HA: |
| 7624 | if (parameters->options().toc_optimize()) |
| 7625 | { |
| 7626 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7627 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7628 | if ((insn & ((0x3f << 26) | 0x1f << 16)) |
| 7629 | != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */) |
| 7630 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7631 | _("toc optimization is not supported " |
| 7632 | "for %#08x instruction"), insn); |
| 7633 | else if (value + 0x8000 < 0x10000) |
| 7634 | { |
| 7635 | elfcpp::Swap<32, big_endian>::writeval(iview, nop); |
| 7636 | return true; |
| 7637 | } |
| 7638 | } |
| 7639 | break; |
| 7640 | |
| 7641 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 7642 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 7643 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 7644 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 7645 | case elfcpp::R_POWERPC_GOT16_LO: |
| 7646 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 7647 | case elfcpp::R_PPC64_TOC16_LO: |
| 7648 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 7649 | if (parameters->options().toc_optimize()) |
| 7650 | { |
| 7651 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7652 | Insn insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7653 | if (!ok_lo_toc_insn(insn)) |
| 7654 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7655 | _("toc optimization is not supported " |
| 7656 | "for %#08x instruction"), insn); |
| 7657 | else if (value + 0x8000 < 0x10000) |
| 7658 | { |
| 7659 | if ((insn & (0x3f << 26)) == 12u << 26 /* addic */) |
| 7660 | { |
| 7661 | // Transform addic to addi when we change reg. |
| 7662 | insn &= ~((0x3f << 26) | (0x1f << 16)); |
| 7663 | insn |= (14u << 26) | (2 << 16); |
| 7664 | } |
| 7665 | else |
| 7666 | { |
| 7667 | insn &= ~(0x1f << 16); |
| 7668 | insn |= 2 << 16; |
| 7669 | } |
| 7670 | elfcpp::Swap<32, big_endian>::writeval(iview, insn); |
| 7671 | } |
| 7672 | } |
| 7673 | break; |
| 7674 | |
| 7675 | case elfcpp::R_PPC64_ENTRY: |
| 7676 | value = (target->got_section()->output_section()->address() |
| 7677 | + object->toc_base_offset()); |
| 7678 | if (value + 0x80008000 <= 0xffffffff |
| 7679 | && !parameters->options().output_is_position_independent()) |
| 7680 | { |
| 7681 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 7682 | Insn insn1 = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7683 | Insn insn2 = elfcpp::Swap<32, big_endian>::readval(iview + 1); |
| 7684 | |
| 7685 | if ((insn1 & ~0xfffc) == ld_2_12 |
| 7686 | && insn2 == add_2_2_12) |
| 7687 | { |
| 7688 | insn1 = lis_2 + ha(value); |
| 7689 | elfcpp::Swap<32, big_endian>::writeval(iview, insn1); |
| 7690 | insn2 = addi_2_2 + l(value); |
| 7691 | elfcpp::Swap<32, big_endian>::writeval(iview + 1, insn2); |
| 7692 | return true; |
| 7693 | } |
| 7694 | } |
| 7695 | else |
| 7696 | { |
| 7697 | value -= address; |
| 7698 | if (value + 0x80008000 <= 0xffffffff) |
| 7699 | { |
| 7700 | Insn* iview = reinterpret_cast<Insn*>(view); |
| 7701 | Insn insn1 = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7702 | Insn insn2 = elfcpp::Swap<32, big_endian>::readval(iview + 1); |
| 7703 | |
| 7704 | if ((insn1 & ~0xfffc) == ld_2_12 |
| 7705 | && insn2 == add_2_2_12) |
| 7706 | { |
| 7707 | insn1 = addis_2_12 + ha(value); |
| 7708 | elfcpp::Swap<32, big_endian>::writeval(iview, insn1); |
| 7709 | insn2 = addi_2_2 + l(value); |
| 7710 | elfcpp::Swap<32, big_endian>::writeval(iview + 1, insn2); |
| 7711 | return true; |
| 7712 | } |
| 7713 | } |
| 7714 | } |
| 7715 | break; |
| 7716 | |
| 7717 | case elfcpp::R_POWERPC_REL16_LO: |
| 7718 | // If we are generating a non-PIC executable, edit |
| 7719 | // 0: addis 2,12,.TOC.-0b@ha |
| 7720 | // addi 2,2,.TOC.-0b@l |
| 7721 | // used by ELFv2 global entry points to set up r2, to |
| 7722 | // lis 2,.TOC.@ha |
| 7723 | // addi 2,2,.TOC.@l |
| 7724 | // if .TOC. is in range. */ |
| 7725 | if (value + address - 4 + 0x80008000 <= 0xffffffff |
| 7726 | && relnum != 0 |
| 7727 | && preloc != NULL |
| 7728 | && target->abiversion() >= 2 |
| 7729 | && !parameters->options().output_is_position_independent() |
| 7730 | && rela.get_r_addend() == d_offset + 4 |
| 7731 | && gsym != NULL |
| 7732 | && strcmp(gsym->name(), ".TOC.") == 0) |
| 7733 | { |
| 7734 | const int reloc_size |
| 7735 | = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| 7736 | Reltype prev_rela(preloc - reloc_size); |
| 7737 | if ((prev_rela.get_r_info() |
| 7738 | == elfcpp::elf_r_info<size>(r_sym, |
| 7739 | elfcpp::R_POWERPC_REL16_HA)) |
| 7740 | && prev_rela.get_r_offset() + 4 == rela.get_r_offset() |
| 7741 | && prev_rela.get_r_addend() + 4 == rela.get_r_addend()) |
| 7742 | { |
| 7743 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7744 | Insn insn1 = elfcpp::Swap<32, big_endian>::readval(iview - 1); |
| 7745 | Insn insn2 = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7746 | |
| 7747 | if ((insn1 & 0xffff0000) == addis_2_12 |
| 7748 | && (insn2 & 0xffff0000) == addi_2_2) |
| 7749 | { |
| 7750 | insn1 = lis_2 + ha(value + address - 4); |
| 7751 | elfcpp::Swap<32, big_endian>::writeval(iview - 1, insn1); |
| 7752 | insn2 = addi_2_2 + l(value + address - 4); |
| 7753 | elfcpp::Swap<32, big_endian>::writeval(iview, insn2); |
| 7754 | if (relinfo->rr) |
| 7755 | { |
| 7756 | relinfo->rr->set_strategy(relnum - 1, |
| 7757 | Relocatable_relocs::RELOC_SPECIAL); |
| 7758 | relinfo->rr->set_strategy(relnum, |
| 7759 | Relocatable_relocs::RELOC_SPECIAL); |
| 7760 | } |
| 7761 | return true; |
| 7762 | } |
| 7763 | } |
| 7764 | } |
| 7765 | break; |
| 7766 | } |
| 7767 | } |
| 7768 | |
| 7769 | typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE; |
| 7770 | elfcpp::Shdr<size, big_endian> shdr(relinfo->data_shdr); |
| 7771 | switch (r_type) |
| 7772 | { |
| 7773 | case elfcpp::R_POWERPC_ADDR32: |
| 7774 | case elfcpp::R_POWERPC_UADDR32: |
| 7775 | if (size == 64) |
| 7776 | overflow = Reloc::CHECK_BITFIELD; |
| 7777 | break; |
| 7778 | |
| 7779 | case elfcpp::R_POWERPC_REL32: |
| 7780 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 7781 | if (size == 64) |
| 7782 | overflow = Reloc::CHECK_SIGNED; |
| 7783 | break; |
| 7784 | |
| 7785 | case elfcpp::R_POWERPC_UADDR16: |
| 7786 | overflow = Reloc::CHECK_BITFIELD; |
| 7787 | break; |
| 7788 | |
| 7789 | case elfcpp::R_POWERPC_ADDR16: |
| 7790 | // We really should have three separate relocations, |
| 7791 | // one for 16-bit data, one for insns with 16-bit signed fields, |
| 7792 | // and one for insns with 16-bit unsigned fields. |
| 7793 | overflow = Reloc::CHECK_BITFIELD; |
| 7794 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0) |
| 7795 | overflow = Reloc::CHECK_LOW_INSN; |
| 7796 | break; |
| 7797 | |
| 7798 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 7799 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 7800 | case elfcpp::R_POWERPC_GOT16_HI: |
| 7801 | case elfcpp::R_POWERPC_GOT16_HA: |
| 7802 | case elfcpp::R_POWERPC_PLT16_HI: |
| 7803 | case elfcpp::R_POWERPC_PLT16_HA: |
| 7804 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 7805 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 7806 | case elfcpp::R_PPC64_TOC16_HI: |
| 7807 | case elfcpp::R_PPC64_TOC16_HA: |
| 7808 | case elfcpp::R_PPC64_PLTGOT16_HI: |
| 7809 | case elfcpp::R_PPC64_PLTGOT16_HA: |
| 7810 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 7811 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 7812 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 7813 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 7814 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 7815 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 7816 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 7817 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 7818 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 7819 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 7820 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 7821 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 7822 | case elfcpp::R_POWERPC_REL16_HI: |
| 7823 | case elfcpp::R_POWERPC_REL16_HA: |
| 7824 | if (size != 32) |
| 7825 | overflow = Reloc::CHECK_HIGH_INSN; |
| 7826 | break; |
| 7827 | |
| 7828 | case elfcpp::R_POWERPC_REL16: |
| 7829 | case elfcpp::R_PPC64_TOC16: |
| 7830 | case elfcpp::R_POWERPC_GOT16: |
| 7831 | case elfcpp::R_POWERPC_SECTOFF: |
| 7832 | case elfcpp::R_POWERPC_TPREL16: |
| 7833 | case elfcpp::R_POWERPC_DTPREL16: |
| 7834 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 7835 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 7836 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 7837 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 7838 | overflow = Reloc::CHECK_LOW_INSN; |
| 7839 | break; |
| 7840 | |
| 7841 | case elfcpp::R_POWERPC_ADDR24: |
| 7842 | case elfcpp::R_POWERPC_ADDR14: |
| 7843 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 7844 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 7845 | case elfcpp::R_PPC64_ADDR16_DS: |
| 7846 | case elfcpp::R_POWERPC_REL24: |
| 7847 | case elfcpp::R_PPC_PLTREL24: |
| 7848 | case elfcpp::R_PPC_LOCAL24PC: |
| 7849 | case elfcpp::R_PPC64_TPREL16_DS: |
| 7850 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 7851 | case elfcpp::R_PPC64_TOC16_DS: |
| 7852 | case elfcpp::R_PPC64_GOT16_DS: |
| 7853 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 7854 | case elfcpp::R_POWERPC_REL14: |
| 7855 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 7856 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 7857 | overflow = Reloc::CHECK_SIGNED; |
| 7858 | break; |
| 7859 | } |
| 7860 | |
| 7861 | Insn* iview = reinterpret_cast<Insn*>(view - d_offset); |
| 7862 | Insn insn = 0; |
| 7863 | |
| 7864 | if (overflow == Reloc::CHECK_LOW_INSN |
| 7865 | || overflow == Reloc::CHECK_HIGH_INSN) |
| 7866 | { |
| 7867 | insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 7868 | |
| 7869 | if ((insn & (0x3f << 26)) == 10u << 26 /* cmpli */) |
| 7870 | overflow = Reloc::CHECK_BITFIELD; |
| 7871 | else if (overflow == Reloc::CHECK_LOW_INSN |
| 7872 | ? ((insn & (0x3f << 26)) == 28u << 26 /* andi */ |
| 7873 | || (insn & (0x3f << 26)) == 24u << 26 /* ori */ |
| 7874 | || (insn & (0x3f << 26)) == 26u << 26 /* xori */) |
| 7875 | : ((insn & (0x3f << 26)) == 29u << 26 /* andis */ |
| 7876 | || (insn & (0x3f << 26)) == 25u << 26 /* oris */ |
| 7877 | || (insn & (0x3f << 26)) == 27u << 26 /* xoris */)) |
| 7878 | overflow = Reloc::CHECK_UNSIGNED; |
| 7879 | else |
| 7880 | overflow = Reloc::CHECK_SIGNED; |
| 7881 | } |
| 7882 | |
| 7883 | bool maybe_dq_reloc = false; |
| 7884 | typename Powerpc_relocate_functions<size, big_endian>::Status status |
| 7885 | = Powerpc_relocate_functions<size, big_endian>::STATUS_OK; |
| 7886 | switch (r_type) |
| 7887 | { |
| 7888 | case elfcpp::R_POWERPC_NONE: |
| 7889 | case elfcpp::R_POWERPC_TLS: |
| 7890 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 7891 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 7892 | break; |
| 7893 | |
| 7894 | case elfcpp::R_PPC64_ADDR64: |
| 7895 | case elfcpp::R_PPC64_REL64: |
| 7896 | case elfcpp::R_PPC64_TOC: |
| 7897 | case elfcpp::R_PPC64_ADDR64_LOCAL: |
| 7898 | Reloc::addr64(view, value); |
| 7899 | break; |
| 7900 | |
| 7901 | case elfcpp::R_POWERPC_TPREL: |
| 7902 | case elfcpp::R_POWERPC_DTPREL: |
| 7903 | if (size == 64) |
| 7904 | Reloc::addr64(view, value); |
| 7905 | else |
| 7906 | status = Reloc::addr32(view, value, overflow); |
| 7907 | break; |
| 7908 | |
| 7909 | case elfcpp::R_PPC64_UADDR64: |
| 7910 | Reloc::addr64_u(view, value); |
| 7911 | break; |
| 7912 | |
| 7913 | case elfcpp::R_POWERPC_ADDR32: |
| 7914 | status = Reloc::addr32(view, value, overflow); |
| 7915 | break; |
| 7916 | |
| 7917 | case elfcpp::R_POWERPC_REL32: |
| 7918 | case elfcpp::R_POWERPC_UADDR32: |
| 7919 | status = Reloc::addr32_u(view, value, overflow); |
| 7920 | break; |
| 7921 | |
| 7922 | case elfcpp::R_POWERPC_ADDR24: |
| 7923 | case elfcpp::R_POWERPC_REL24: |
| 7924 | case elfcpp::R_PPC_PLTREL24: |
| 7925 | case elfcpp::R_PPC_LOCAL24PC: |
| 7926 | status = Reloc::addr24(view, value, overflow); |
| 7927 | break; |
| 7928 | |
| 7929 | case elfcpp::R_POWERPC_GOT_DTPREL16: |
| 7930 | case elfcpp::R_POWERPC_GOT_DTPREL16_LO: |
| 7931 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 7932 | case elfcpp::R_POWERPC_GOT_TPREL16_LO: |
| 7933 | if (size == 64) |
| 7934 | { |
| 7935 | // On ppc64 these are all ds form |
| 7936 | maybe_dq_reloc = true; |
| 7937 | break; |
| 7938 | } |
| 7939 | case elfcpp::R_POWERPC_ADDR16: |
| 7940 | case elfcpp::R_POWERPC_REL16: |
| 7941 | case elfcpp::R_PPC64_TOC16: |
| 7942 | case elfcpp::R_POWERPC_GOT16: |
| 7943 | case elfcpp::R_POWERPC_SECTOFF: |
| 7944 | case elfcpp::R_POWERPC_TPREL16: |
| 7945 | case elfcpp::R_POWERPC_DTPREL16: |
| 7946 | case elfcpp::R_POWERPC_GOT_TLSGD16: |
| 7947 | case elfcpp::R_POWERPC_GOT_TLSLD16: |
| 7948 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 7949 | case elfcpp::R_POWERPC_REL16_LO: |
| 7950 | case elfcpp::R_PPC64_TOC16_LO: |
| 7951 | case elfcpp::R_POWERPC_GOT16_LO: |
| 7952 | case elfcpp::R_POWERPC_SECTOFF_LO: |
| 7953 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 7954 | case elfcpp::R_POWERPC_DTPREL16_LO: |
| 7955 | case elfcpp::R_POWERPC_GOT_TLSGD16_LO: |
| 7956 | case elfcpp::R_POWERPC_GOT_TLSLD16_LO: |
| 7957 | if (size == 64) |
| 7958 | status = Reloc::addr16(view, value, overflow); |
| 7959 | else |
| 7960 | maybe_dq_reloc = true; |
| 7961 | break; |
| 7962 | |
| 7963 | case elfcpp::R_POWERPC_UADDR16: |
| 7964 | status = Reloc::addr16_u(view, value, overflow); |
| 7965 | break; |
| 7966 | |
| 7967 | case elfcpp::R_PPC64_ADDR16_HIGH: |
| 7968 | case elfcpp::R_PPC64_TPREL16_HIGH: |
| 7969 | case elfcpp::R_PPC64_DTPREL16_HIGH: |
| 7970 | if (size == 32) |
| 7971 | // R_PPC_EMB_MRKREF, R_PPC_EMB_RELST_LO, R_PPC_EMB_RELST_HA |
| 7972 | goto unsupp; |
| 7973 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 7974 | case elfcpp::R_POWERPC_REL16_HI: |
| 7975 | case elfcpp::R_PPC64_TOC16_HI: |
| 7976 | case elfcpp::R_POWERPC_GOT16_HI: |
| 7977 | case elfcpp::R_POWERPC_SECTOFF_HI: |
| 7978 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 7979 | case elfcpp::R_POWERPC_DTPREL16_HI: |
| 7980 | case elfcpp::R_POWERPC_GOT_TLSGD16_HI: |
| 7981 | case elfcpp::R_POWERPC_GOT_TLSLD16_HI: |
| 7982 | case elfcpp::R_POWERPC_GOT_TPREL16_HI: |
| 7983 | case elfcpp::R_POWERPC_GOT_DTPREL16_HI: |
| 7984 | Reloc::addr16_hi(view, value); |
| 7985 | break; |
| 7986 | |
| 7987 | case elfcpp::R_PPC64_ADDR16_HIGHA: |
| 7988 | case elfcpp::R_PPC64_TPREL16_HIGHA: |
| 7989 | case elfcpp::R_PPC64_DTPREL16_HIGHA: |
| 7990 | if (size == 32) |
| 7991 | // R_PPC_EMB_RELSEC16, R_PPC_EMB_RELST_HI, R_PPC_EMB_BIT_FLD |
| 7992 | goto unsupp; |
| 7993 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 7994 | case elfcpp::R_POWERPC_REL16_HA: |
| 7995 | case elfcpp::R_PPC64_TOC16_HA: |
| 7996 | case elfcpp::R_POWERPC_GOT16_HA: |
| 7997 | case elfcpp::R_POWERPC_SECTOFF_HA: |
| 7998 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 7999 | case elfcpp::R_POWERPC_DTPREL16_HA: |
| 8000 | case elfcpp::R_POWERPC_GOT_TLSGD16_HA: |
| 8001 | case elfcpp::R_POWERPC_GOT_TLSLD16_HA: |
| 8002 | case elfcpp::R_POWERPC_GOT_TPREL16_HA: |
| 8003 | case elfcpp::R_POWERPC_GOT_DTPREL16_HA: |
| 8004 | Reloc::addr16_ha(view, value); |
| 8005 | break; |
| 8006 | |
| 8007 | case elfcpp::R_POWERPC_REL16DX_HA: |
| 8008 | status = Reloc::addr16dx_ha(view, value, overflow); |
| 8009 | break; |
| 8010 | |
| 8011 | case elfcpp::R_PPC64_DTPREL16_HIGHER: |
| 8012 | if (size == 32) |
| 8013 | // R_PPC_EMB_NADDR16_LO |
| 8014 | goto unsupp; |
| 8015 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 8016 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 8017 | Reloc::addr16_hi2(view, value); |
| 8018 | break; |
| 8019 | |
| 8020 | case elfcpp::R_PPC64_DTPREL16_HIGHERA: |
| 8021 | if (size == 32) |
| 8022 | // R_PPC_EMB_NADDR16_HI |
| 8023 | goto unsupp; |
| 8024 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 8025 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 8026 | Reloc::addr16_ha2(view, value); |
| 8027 | break; |
| 8028 | |
| 8029 | case elfcpp::R_PPC64_DTPREL16_HIGHEST: |
| 8030 | if (size == 32) |
| 8031 | // R_PPC_EMB_NADDR16_HA |
| 8032 | goto unsupp; |
| 8033 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 8034 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 8035 | Reloc::addr16_hi3(view, value); |
| 8036 | break; |
| 8037 | |
| 8038 | case elfcpp::R_PPC64_DTPREL16_HIGHESTA: |
| 8039 | if (size == 32) |
| 8040 | // R_PPC_EMB_SDAI16 |
| 8041 | goto unsupp; |
| 8042 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 8043 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 8044 | Reloc::addr16_ha3(view, value); |
| 8045 | break; |
| 8046 | |
| 8047 | case elfcpp::R_PPC64_DTPREL16_DS: |
| 8048 | case elfcpp::R_PPC64_DTPREL16_LO_DS: |
| 8049 | if (size == 32) |
| 8050 | // R_PPC_EMB_NADDR32, R_PPC_EMB_NADDR16 |
| 8051 | goto unsupp; |
| 8052 | case elfcpp::R_PPC64_TPREL16_DS: |
| 8053 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 8054 | if (size == 32) |
| 8055 | // R_PPC_TLSGD, R_PPC_TLSLD |
| 8056 | break; |
| 8057 | case elfcpp::R_PPC64_ADDR16_DS: |
| 8058 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 8059 | case elfcpp::R_PPC64_TOC16_DS: |
| 8060 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 8061 | case elfcpp::R_PPC64_GOT16_DS: |
| 8062 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 8063 | case elfcpp::R_PPC64_SECTOFF_DS: |
| 8064 | case elfcpp::R_PPC64_SECTOFF_LO_DS: |
| 8065 | maybe_dq_reloc = true; |
| 8066 | break; |
| 8067 | |
| 8068 | case elfcpp::R_POWERPC_ADDR14: |
| 8069 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 8070 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 8071 | case elfcpp::R_POWERPC_REL14: |
| 8072 | case elfcpp::R_POWERPC_REL14_BRTAKEN: |
| 8073 | case elfcpp::R_POWERPC_REL14_BRNTAKEN: |
| 8074 | status = Reloc::addr14(view, value, overflow); |
| 8075 | break; |
| 8076 | |
| 8077 | case elfcpp::R_POWERPC_COPY: |
| 8078 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 8079 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 8080 | case elfcpp::R_POWERPC_RELATIVE: |
| 8081 | case elfcpp::R_POWERPC_DTPMOD: |
| 8082 | case elfcpp::R_PPC64_JMP_IREL: |
| 8083 | case elfcpp::R_POWERPC_IRELATIVE: |
| 8084 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 8085 | _("unexpected reloc %u in object file"), |
| 8086 | r_type); |
| 8087 | break; |
| 8088 | |
| 8089 | case elfcpp::R_PPC_EMB_SDA21: |
| 8090 | if (size == 32) |
| 8091 | goto unsupp; |
| 8092 | else |
| 8093 | { |
| 8094 | // R_PPC64_TOCSAVE. For the time being this can be ignored. |
| 8095 | } |
| 8096 | break; |
| 8097 | |
| 8098 | case elfcpp::R_PPC_EMB_SDA2I16: |
| 8099 | case elfcpp::R_PPC_EMB_SDA2REL: |
| 8100 | if (size == 32) |
| 8101 | goto unsupp; |
| 8102 | // R_PPC64_TLSGD, R_PPC64_TLSLD |
| 8103 | break; |
| 8104 | |
| 8105 | case elfcpp::R_POWERPC_PLT32: |
| 8106 | case elfcpp::R_POWERPC_PLTREL32: |
| 8107 | case elfcpp::R_POWERPC_PLT16_LO: |
| 8108 | case elfcpp::R_POWERPC_PLT16_HI: |
| 8109 | case elfcpp::R_POWERPC_PLT16_HA: |
| 8110 | case elfcpp::R_PPC_SDAREL16: |
| 8111 | case elfcpp::R_POWERPC_ADDR30: |
| 8112 | case elfcpp::R_PPC64_PLT64: |
| 8113 | case elfcpp::R_PPC64_PLTREL64: |
| 8114 | case elfcpp::R_PPC64_PLTGOT16: |
| 8115 | case elfcpp::R_PPC64_PLTGOT16_LO: |
| 8116 | case elfcpp::R_PPC64_PLTGOT16_HI: |
| 8117 | case elfcpp::R_PPC64_PLTGOT16_HA: |
| 8118 | case elfcpp::R_PPC64_PLT16_LO_DS: |
| 8119 | case elfcpp::R_PPC64_PLTGOT16_DS: |
| 8120 | case elfcpp::R_PPC64_PLTGOT16_LO_DS: |
| 8121 | case elfcpp::R_PPC_EMB_RELSDA: |
| 8122 | case elfcpp::R_PPC_TOC16: |
| 8123 | default: |
| 8124 | unsupp: |
| 8125 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 8126 | _("unsupported reloc %u"), |
| 8127 | r_type); |
| 8128 | break; |
| 8129 | } |
| 8130 | |
| 8131 | if (maybe_dq_reloc) |
| 8132 | { |
| 8133 | if (insn == 0) |
| 8134 | insn = elfcpp::Swap<32, big_endian>::readval(iview); |
| 8135 | |
| 8136 | if ((insn & (0x3f << 26)) == 56u << 26 /* lq */ |
| 8137 | || ((insn & (0x3f << 26)) == (61u << 26) /* lxv, stxv */ |
| 8138 | && (insn & 3) == 1)) |
| 8139 | status = Reloc::addr16_dq(view, value, overflow); |
| 8140 | else if (size == 64 |
| 8141 | || (insn & (0x3f << 26)) == 58u << 26 /* ld,ldu,lwa */ |
| 8142 | || (insn & (0x3f << 26)) == 62u << 26 /* std,stdu,stq */ |
| 8143 | || (insn & (0x3f << 26)) == 57u << 26 /* lfdp */ |
| 8144 | || (insn & (0x3f << 26)) == 61u << 26 /* stfdp */) |
| 8145 | status = Reloc::addr16_ds(view, value, overflow); |
| 8146 | else |
| 8147 | status = Reloc::addr16(view, value, overflow); |
| 8148 | } |
| 8149 | |
| 8150 | if (status != Powerpc_relocate_functions<size, big_endian>::STATUS_OK |
| 8151 | && (has_stub_value |
| 8152 | || !(gsym != NULL |
| 8153 | && gsym->is_undefined() |
| 8154 | && is_branch_reloc(r_type)))) |
| 8155 | { |
| 8156 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 8157 | _("relocation overflow")); |
| 8158 | if (has_stub_value) |
| 8159 | gold_info(_("try relinking with a smaller --stub-group-size")); |
| 8160 | } |
| 8161 | |
| 8162 | return true; |
| 8163 | } |
| 8164 | |
| 8165 | // Relocate section data. |
| 8166 | |
| 8167 | template<int size, bool big_endian> |
| 8168 | void |
| 8169 | Target_powerpc<size, big_endian>::relocate_section( |
| 8170 | const Relocate_info<size, big_endian>* relinfo, |
| 8171 | unsigned int sh_type, |
| 8172 | const unsigned char* prelocs, |
| 8173 | size_t reloc_count, |
| 8174 | Output_section* output_section, |
| 8175 | bool needs_special_offset_handling, |
| 8176 | unsigned char* view, |
| 8177 | Address address, |
| 8178 | section_size_type view_size, |
| 8179 | const Reloc_symbol_changes* reloc_symbol_changes) |
| 8180 | { |
| 8181 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 8182 | typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate; |
| 8183 | typedef typename Target_powerpc<size, big_endian>::Relocate_comdat_behavior |
| 8184 | Powerpc_comdat_behavior; |
| 8185 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 8186 | Classify_reloc; |
| 8187 | |
| 8188 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 8189 | |
| 8190 | gold::relocate_section<size, big_endian, Powerpc, Powerpc_relocate, |
| 8191 | Powerpc_comdat_behavior, Classify_reloc>( |
| 8192 | relinfo, |
| 8193 | this, |
| 8194 | prelocs, |
| 8195 | reloc_count, |
| 8196 | output_section, |
| 8197 | needs_special_offset_handling, |
| 8198 | view, |
| 8199 | address, |
| 8200 | view_size, |
| 8201 | reloc_symbol_changes); |
| 8202 | } |
| 8203 | |
| 8204 | template<int size, bool big_endian> |
| 8205 | class Powerpc_scan_relocatable_reloc |
| 8206 | { |
| 8207 | public: |
| 8208 | typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc |
| 8209 | Reltype; |
| 8210 | static const int reloc_size = |
| 8211 | Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| 8212 | static const int sh_type = elfcpp::SHT_RELA; |
| 8213 | |
| 8214 | // Return the symbol referred to by the relocation. |
| 8215 | static inline unsigned int |
| 8216 | get_r_sym(const Reltype* reloc) |
| 8217 | { return elfcpp::elf_r_sym<size>(reloc->get_r_info()); } |
| 8218 | |
| 8219 | // Return the type of the relocation. |
| 8220 | static inline unsigned int |
| 8221 | get_r_type(const Reltype* reloc) |
| 8222 | { return elfcpp::elf_r_type<size>(reloc->get_r_info()); } |
| 8223 | |
| 8224 | // Return the strategy to use for a local symbol which is not a |
| 8225 | // section symbol, given the relocation type. |
| 8226 | inline Relocatable_relocs::Reloc_strategy |
| 8227 | local_non_section_strategy(unsigned int r_type, Relobj*, unsigned int r_sym) |
| 8228 | { |
| 8229 | if (r_type == 0 && r_sym == 0) |
| 8230 | return Relocatable_relocs::RELOC_DISCARD; |
| 8231 | return Relocatable_relocs::RELOC_COPY; |
| 8232 | } |
| 8233 | |
| 8234 | // Return the strategy to use for a local symbol which is a section |
| 8235 | // symbol, given the relocation type. |
| 8236 | inline Relocatable_relocs::Reloc_strategy |
| 8237 | local_section_strategy(unsigned int, Relobj*) |
| 8238 | { |
| 8239 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; |
| 8240 | } |
| 8241 | |
| 8242 | // Return the strategy to use for a global symbol, given the |
| 8243 | // relocation type, the object, and the symbol index. |
| 8244 | inline Relocatable_relocs::Reloc_strategy |
| 8245 | global_strategy(unsigned int r_type, Relobj*, unsigned int) |
| 8246 | { |
| 8247 | if (r_type == elfcpp::R_PPC_PLTREL24) |
| 8248 | return Relocatable_relocs::RELOC_SPECIAL; |
| 8249 | return Relocatable_relocs::RELOC_COPY; |
| 8250 | } |
| 8251 | }; |
| 8252 | |
| 8253 | // Scan the relocs during a relocatable link. |
| 8254 | |
| 8255 | template<int size, bool big_endian> |
| 8256 | void |
| 8257 | Target_powerpc<size, big_endian>::scan_relocatable_relocs( |
| 8258 | Symbol_table* symtab, |
| 8259 | Layout* layout, |
| 8260 | Sized_relobj_file<size, big_endian>* object, |
| 8261 | unsigned int data_shndx, |
| 8262 | unsigned int sh_type, |
| 8263 | const unsigned char* prelocs, |
| 8264 | size_t reloc_count, |
| 8265 | Output_section* output_section, |
| 8266 | bool needs_special_offset_handling, |
| 8267 | size_t local_symbol_count, |
| 8268 | const unsigned char* plocal_symbols, |
| 8269 | Relocatable_relocs* rr) |
| 8270 | { |
| 8271 | typedef Powerpc_scan_relocatable_reloc<size, big_endian> Scan_strategy; |
| 8272 | |
| 8273 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 8274 | |
| 8275 | gold::scan_relocatable_relocs<size, big_endian, Scan_strategy>( |
| 8276 | symtab, |
| 8277 | layout, |
| 8278 | object, |
| 8279 | data_shndx, |
| 8280 | prelocs, |
| 8281 | reloc_count, |
| 8282 | output_section, |
| 8283 | needs_special_offset_handling, |
| 8284 | local_symbol_count, |
| 8285 | plocal_symbols, |
| 8286 | rr); |
| 8287 | } |
| 8288 | |
| 8289 | // Scan the relocs for --emit-relocs. |
| 8290 | |
| 8291 | template<int size, bool big_endian> |
| 8292 | void |
| 8293 | Target_powerpc<size, big_endian>::emit_relocs_scan( |
| 8294 | Symbol_table* symtab, |
| 8295 | Layout* layout, |
| 8296 | Sized_relobj_file<size, big_endian>* object, |
| 8297 | unsigned int data_shndx, |
| 8298 | unsigned int sh_type, |
| 8299 | const unsigned char* prelocs, |
| 8300 | size_t reloc_count, |
| 8301 | Output_section* output_section, |
| 8302 | bool needs_special_offset_handling, |
| 8303 | size_t local_symbol_count, |
| 8304 | const unsigned char* plocal_syms, |
| 8305 | Relocatable_relocs* rr) |
| 8306 | { |
| 8307 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 8308 | Classify_reloc; |
| 8309 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> |
| 8310 | Emit_relocs_strategy; |
| 8311 | |
| 8312 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 8313 | |
| 8314 | gold::scan_relocatable_relocs<size, big_endian, Emit_relocs_strategy>( |
| 8315 | symtab, |
| 8316 | layout, |
| 8317 | object, |
| 8318 | data_shndx, |
| 8319 | prelocs, |
| 8320 | reloc_count, |
| 8321 | output_section, |
| 8322 | needs_special_offset_handling, |
| 8323 | local_symbol_count, |
| 8324 | plocal_syms, |
| 8325 | rr); |
| 8326 | } |
| 8327 | |
| 8328 | // Emit relocations for a section. |
| 8329 | // This is a modified version of the function by the same name in |
| 8330 | // target-reloc.h. Using relocate_special_relocatable for |
| 8331 | // R_PPC_PLTREL24 would require duplication of the entire body of the |
| 8332 | // loop, so we may as well duplicate the whole thing. |
| 8333 | |
| 8334 | template<int size, bool big_endian> |
| 8335 | void |
| 8336 | Target_powerpc<size, big_endian>::relocate_relocs( |
| 8337 | const Relocate_info<size, big_endian>* relinfo, |
| 8338 | unsigned int sh_type, |
| 8339 | const unsigned char* prelocs, |
| 8340 | size_t reloc_count, |
| 8341 | Output_section* output_section, |
| 8342 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 8343 | unsigned char*, |
| 8344 | Address view_address, |
| 8345 | section_size_type, |
| 8346 | unsigned char* reloc_view, |
| 8347 | section_size_type reloc_view_size) |
| 8348 | { |
| 8349 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 8350 | |
| 8351 | typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc |
| 8352 | Reltype; |
| 8353 | typedef typename Reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc_write |
| 8354 | Reltype_write; |
| 8355 | const int reloc_size |
| 8356 | = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size; |
| 8357 | // Offset from start of insn to d-field reloc. |
| 8358 | const int d_offset = big_endian ? 2 : 0; |
| 8359 | |
| 8360 | Powerpc_relobj<size, big_endian>* const object |
| 8361 | = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object); |
| 8362 | const unsigned int local_count = object->local_symbol_count(); |
| 8363 | unsigned int got2_shndx = object->got2_shndx(); |
| 8364 | Address got2_addend = 0; |
| 8365 | if (got2_shndx != 0) |
| 8366 | { |
| 8367 | got2_addend = object->get_output_section_offset(got2_shndx); |
| 8368 | gold_assert(got2_addend != invalid_address); |
| 8369 | } |
| 8370 | |
| 8371 | unsigned char* pwrite = reloc_view; |
| 8372 | bool zap_next = false; |
| 8373 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| 8374 | { |
| 8375 | Relocatable_relocs::Reloc_strategy strategy = relinfo->rr->strategy(i); |
| 8376 | if (strategy == Relocatable_relocs::RELOC_DISCARD) |
| 8377 | continue; |
| 8378 | |
| 8379 | Reltype reloc(prelocs); |
| 8380 | Reltype_write reloc_write(pwrite); |
| 8381 | |
| 8382 | Address offset = reloc.get_r_offset(); |
| 8383 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); |
| 8384 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 8385 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 8386 | const unsigned int orig_r_sym = r_sym; |
| 8387 | typename elfcpp::Elf_types<size>::Elf_Swxword addend |
| 8388 | = reloc.get_r_addend(); |
| 8389 | const Symbol* gsym = NULL; |
| 8390 | |
| 8391 | if (zap_next) |
| 8392 | { |
| 8393 | // We could arrange to discard these and other relocs for |
| 8394 | // tls optimised sequences in the strategy methods, but for |
| 8395 | // now do as BFD ld does. |
| 8396 | r_type = elfcpp::R_POWERPC_NONE; |
| 8397 | zap_next = false; |
| 8398 | } |
| 8399 | |
| 8400 | // Get the new symbol index. |
| 8401 | Output_section* os = NULL; |
| 8402 | if (r_sym < local_count) |
| 8403 | { |
| 8404 | switch (strategy) |
| 8405 | { |
| 8406 | case Relocatable_relocs::RELOC_COPY: |
| 8407 | case Relocatable_relocs::RELOC_SPECIAL: |
| 8408 | if (r_sym != 0) |
| 8409 | { |
| 8410 | r_sym = object->symtab_index(r_sym); |
| 8411 | gold_assert(r_sym != -1U); |
| 8412 | } |
| 8413 | break; |
| 8414 | |
| 8415 | case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA: |
| 8416 | { |
| 8417 | // We are adjusting a section symbol. We need to find |
| 8418 | // the symbol table index of the section symbol for |
| 8419 | // the output section corresponding to input section |
| 8420 | // in which this symbol is defined. |
| 8421 | gold_assert(r_sym < local_count); |
| 8422 | bool is_ordinary; |
| 8423 | unsigned int shndx = |
| 8424 | object->local_symbol_input_shndx(r_sym, &is_ordinary); |
| 8425 | gold_assert(is_ordinary); |
| 8426 | os = object->output_section(shndx); |
| 8427 | gold_assert(os != NULL); |
| 8428 | gold_assert(os->needs_symtab_index()); |
| 8429 | r_sym = os->symtab_index(); |
| 8430 | } |
| 8431 | break; |
| 8432 | |
| 8433 | default: |
| 8434 | gold_unreachable(); |
| 8435 | } |
| 8436 | } |
| 8437 | else |
| 8438 | { |
| 8439 | gsym = object->global_symbol(r_sym); |
| 8440 | gold_assert(gsym != NULL); |
| 8441 | if (gsym->is_forwarder()) |
| 8442 | gsym = relinfo->symtab->resolve_forwards(gsym); |
| 8443 | |
| 8444 | gold_assert(gsym->has_symtab_index()); |
| 8445 | r_sym = gsym->symtab_index(); |
| 8446 | } |
| 8447 | |
| 8448 | // Get the new offset--the location in the output section where |
| 8449 | // this relocation should be applied. |
| 8450 | if (static_cast<Address>(offset_in_output_section) != invalid_address) |
| 8451 | offset += offset_in_output_section; |
| 8452 | else |
| 8453 | { |
| 8454 | section_offset_type sot_offset = |
| 8455 | convert_types<section_offset_type, Address>(offset); |
| 8456 | section_offset_type new_sot_offset = |
| 8457 | output_section->output_offset(object, relinfo->data_shndx, |
| 8458 | sot_offset); |
| 8459 | gold_assert(new_sot_offset != -1); |
| 8460 | offset = new_sot_offset; |
| 8461 | } |
| 8462 | |
| 8463 | // In an object file, r_offset is an offset within the section. |
| 8464 | // In an executable or dynamic object, generated by |
| 8465 | // --emit-relocs, r_offset is an absolute address. |
| 8466 | if (!parameters->options().relocatable()) |
| 8467 | { |
| 8468 | offset += view_address; |
| 8469 | if (static_cast<Address>(offset_in_output_section) != invalid_address) |
| 8470 | offset -= offset_in_output_section; |
| 8471 | } |
| 8472 | |
| 8473 | // Handle the reloc addend based on the strategy. |
| 8474 | if (strategy == Relocatable_relocs::RELOC_COPY) |
| 8475 | ; |
| 8476 | else if (strategy == Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA) |
| 8477 | { |
| 8478 | const Symbol_value<size>* psymval = object->local_symbol(orig_r_sym); |
| 8479 | gold_assert(os != NULL); |
| 8480 | addend = psymval->value(object, addend) - os->address(); |
| 8481 | } |
| 8482 | else if (strategy == Relocatable_relocs::RELOC_SPECIAL) |
| 8483 | { |
| 8484 | if (size == 32) |
| 8485 | { |
| 8486 | if (addend >= 32768) |
| 8487 | addend += got2_addend; |
| 8488 | } |
| 8489 | else if (r_type == elfcpp::R_POWERPC_REL16_HA) |
| 8490 | { |
| 8491 | r_type = elfcpp::R_POWERPC_ADDR16_HA; |
| 8492 | addend -= d_offset; |
| 8493 | } |
| 8494 | else if (r_type == elfcpp::R_POWERPC_REL16_LO) |
| 8495 | { |
| 8496 | r_type = elfcpp::R_POWERPC_ADDR16_LO; |
| 8497 | addend -= d_offset + 4; |
| 8498 | } |
| 8499 | } |
| 8500 | else |
| 8501 | gold_unreachable(); |
| 8502 | |
| 8503 | if (!parameters->options().relocatable()) |
| 8504 | { |
| 8505 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 8506 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO |
| 8507 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HI |
| 8508 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_HA) |
| 8509 | { |
| 8510 | // First instruction of a global dynamic sequence, |
| 8511 | // arg setup insn. |
| 8512 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8513 | switch (this->optimize_tls_gd(final)) |
| 8514 | { |
| 8515 | case tls::TLSOPT_TO_IE: |
| 8516 | r_type += (elfcpp::R_POWERPC_GOT_TPREL16 |
| 8517 | - elfcpp::R_POWERPC_GOT_TLSGD16); |
| 8518 | break; |
| 8519 | case tls::TLSOPT_TO_LE: |
| 8520 | if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16 |
| 8521 | || r_type == elfcpp::R_POWERPC_GOT_TLSGD16_LO) |
| 8522 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 8523 | else |
| 8524 | { |
| 8525 | r_type = elfcpp::R_POWERPC_NONE; |
| 8526 | offset -= d_offset; |
| 8527 | } |
| 8528 | break; |
| 8529 | default: |
| 8530 | break; |
| 8531 | } |
| 8532 | } |
| 8533 | else if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 8534 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO |
| 8535 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HI |
| 8536 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_HA) |
| 8537 | { |
| 8538 | // First instruction of a local dynamic sequence, |
| 8539 | // arg setup insn. |
| 8540 | if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) |
| 8541 | { |
| 8542 | if (r_type == elfcpp::R_POWERPC_GOT_TLSLD16 |
| 8543 | || r_type == elfcpp::R_POWERPC_GOT_TLSLD16_LO) |
| 8544 | { |
| 8545 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 8546 | const Output_section* os = relinfo->layout->tls_segment() |
| 8547 | ->first_section(); |
| 8548 | gold_assert(os != NULL); |
| 8549 | gold_assert(os->needs_symtab_index()); |
| 8550 | r_sym = os->symtab_index(); |
| 8551 | addend = dtp_offset; |
| 8552 | } |
| 8553 | else |
| 8554 | { |
| 8555 | r_type = elfcpp::R_POWERPC_NONE; |
| 8556 | offset -= d_offset; |
| 8557 | } |
| 8558 | } |
| 8559 | } |
| 8560 | else if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 8561 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO |
| 8562 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HI |
| 8563 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_HA) |
| 8564 | { |
| 8565 | // First instruction of initial exec sequence. |
| 8566 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8567 | if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) |
| 8568 | { |
| 8569 | if (r_type == elfcpp::R_POWERPC_GOT_TPREL16 |
| 8570 | || r_type == elfcpp::R_POWERPC_GOT_TPREL16_LO) |
| 8571 | r_type = elfcpp::R_POWERPC_TPREL16_HA; |
| 8572 | else |
| 8573 | { |
| 8574 | r_type = elfcpp::R_POWERPC_NONE; |
| 8575 | offset -= d_offset; |
| 8576 | } |
| 8577 | } |
| 8578 | } |
| 8579 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSGD) |
| 8580 | || (size == 32 && r_type == elfcpp::R_PPC_TLSGD)) |
| 8581 | { |
| 8582 | // Second instruction of a global dynamic sequence, |
| 8583 | // the __tls_get_addr call |
| 8584 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8585 | switch (this->optimize_tls_gd(final)) |
| 8586 | { |
| 8587 | case tls::TLSOPT_TO_IE: |
| 8588 | r_type = elfcpp::R_POWERPC_NONE; |
| 8589 | zap_next = true; |
| 8590 | break; |
| 8591 | case tls::TLSOPT_TO_LE: |
| 8592 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 8593 | offset += d_offset; |
| 8594 | zap_next = true; |
| 8595 | break; |
| 8596 | default: |
| 8597 | break; |
| 8598 | } |
| 8599 | } |
| 8600 | else if ((size == 64 && r_type == elfcpp::R_PPC64_TLSLD) |
| 8601 | || (size == 32 && r_type == elfcpp::R_PPC_TLSLD)) |
| 8602 | { |
| 8603 | // Second instruction of a local dynamic sequence, |
| 8604 | // the __tls_get_addr call |
| 8605 | if (this->optimize_tls_ld() == tls::TLSOPT_TO_LE) |
| 8606 | { |
| 8607 | const Output_section* os = relinfo->layout->tls_segment() |
| 8608 | ->first_section(); |
| 8609 | gold_assert(os != NULL); |
| 8610 | gold_assert(os->needs_symtab_index()); |
| 8611 | r_sym = os->symtab_index(); |
| 8612 | addend = dtp_offset; |
| 8613 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 8614 | offset += d_offset; |
| 8615 | zap_next = true; |
| 8616 | } |
| 8617 | } |
| 8618 | else if (r_type == elfcpp::R_POWERPC_TLS) |
| 8619 | { |
| 8620 | // Second instruction of an initial exec sequence |
| 8621 | const bool final = gsym == NULL || gsym->final_value_is_known(); |
| 8622 | if (this->optimize_tls_ie(final) == tls::TLSOPT_TO_LE) |
| 8623 | { |
| 8624 | r_type = elfcpp::R_POWERPC_TPREL16_LO; |
| 8625 | offset += d_offset; |
| 8626 | } |
| 8627 | } |
| 8628 | } |
| 8629 | |
| 8630 | reloc_write.put_r_offset(offset); |
| 8631 | reloc_write.put_r_info(elfcpp::elf_r_info<size>(r_sym, r_type)); |
| 8632 | reloc_write.put_r_addend(addend); |
| 8633 | |
| 8634 | pwrite += reloc_size; |
| 8635 | } |
| 8636 | |
| 8637 | gold_assert(static_cast<section_size_type>(pwrite - reloc_view) |
| 8638 | == reloc_view_size); |
| 8639 | } |
| 8640 | |
| 8641 | // Return the value to use for a dynamic symbol which requires special |
| 8642 | // treatment. This is how we support equality comparisons of function |
| 8643 | // pointers across shared library boundaries, as described in the |
| 8644 | // processor specific ABI supplement. |
| 8645 | |
| 8646 | template<int size, bool big_endian> |
| 8647 | uint64_t |
| 8648 | Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
| 8649 | { |
| 8650 | if (size == 32) |
| 8651 | { |
| 8652 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| 8653 | for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); |
| 8654 | p != this->stub_tables_.end(); |
| 8655 | ++p) |
| 8656 | { |
| 8657 | Address off = (*p)->find_plt_call_entry(gsym); |
| 8658 | if (off != invalid_address) |
| 8659 | return (*p)->stub_address() + off; |
| 8660 | } |
| 8661 | } |
| 8662 | else if (this->abiversion() >= 2) |
| 8663 | { |
| 8664 | Address off = this->glink_section()->find_global_entry(gsym); |
| 8665 | if (off != invalid_address) |
| 8666 | return this->glink_section()->global_entry_address() + off; |
| 8667 | } |
| 8668 | gold_unreachable(); |
| 8669 | } |
| 8670 | |
| 8671 | // Return the PLT address to use for a local symbol. |
| 8672 | template<int size, bool big_endian> |
| 8673 | uint64_t |
| 8674 | Target_powerpc<size, big_endian>::do_plt_address_for_local( |
| 8675 | const Relobj* object, |
| 8676 | unsigned int symndx) const |
| 8677 | { |
| 8678 | if (size == 32) |
| 8679 | { |
| 8680 | const Sized_relobj<size, big_endian>* relobj |
| 8681 | = static_cast<const Sized_relobj<size, big_endian>*>(object); |
| 8682 | for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); |
| 8683 | p != this->stub_tables_.end(); |
| 8684 | ++p) |
| 8685 | { |
| 8686 | Address off = (*p)->find_plt_call_entry(relobj->sized_relobj(), |
| 8687 | symndx); |
| 8688 | if (off != invalid_address) |
| 8689 | return (*p)->stub_address() + off; |
| 8690 | } |
| 8691 | } |
| 8692 | gold_unreachable(); |
| 8693 | } |
| 8694 | |
| 8695 | // Return the PLT address to use for a global symbol. |
| 8696 | template<int size, bool big_endian> |
| 8697 | uint64_t |
| 8698 | Target_powerpc<size, big_endian>::do_plt_address_for_global( |
| 8699 | const Symbol* gsym) const |
| 8700 | { |
| 8701 | if (size == 32) |
| 8702 | { |
| 8703 | for (typename Stub_tables::const_iterator p = this->stub_tables_.begin(); |
| 8704 | p != this->stub_tables_.end(); |
| 8705 | ++p) |
| 8706 | { |
| 8707 | Address off = (*p)->find_plt_call_entry(gsym); |
| 8708 | if (off != invalid_address) |
| 8709 | return (*p)->stub_address() + off; |
| 8710 | } |
| 8711 | } |
| 8712 | else if (this->abiversion() >= 2) |
| 8713 | { |
| 8714 | Address off = this->glink_section()->find_global_entry(gsym); |
| 8715 | if (off != invalid_address) |
| 8716 | return this->glink_section()->global_entry_address() + off; |
| 8717 | } |
| 8718 | gold_unreachable(); |
| 8719 | } |
| 8720 | |
| 8721 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 8722 | // for a local tls symbol specified by OBJECT, SYMNDX. |
| 8723 | template<int size, bool big_endian> |
| 8724 | int64_t |
| 8725 | Target_powerpc<size, big_endian>::do_tls_offset_for_local( |
| 8726 | const Relobj* object, |
| 8727 | unsigned int symndx, |
| 8728 | unsigned int got_indx) const |
| 8729 | { |
| 8730 | const Powerpc_relobj<size, big_endian>* ppc_object |
| 8731 | = static_cast<const Powerpc_relobj<size, big_endian>*>(object); |
| 8732 | if (ppc_object->local_symbol(symndx)->is_tls_symbol()) |
| 8733 | { |
| 8734 | for (Got_type got_type = GOT_TYPE_TLSGD; |
| 8735 | got_type <= GOT_TYPE_TPREL; |
| 8736 | got_type = Got_type(got_type + 1)) |
| 8737 | if (ppc_object->local_has_got_offset(symndx, got_type)) |
| 8738 | { |
| 8739 | unsigned int off = ppc_object->local_got_offset(symndx, got_type); |
| 8740 | if (got_type == GOT_TYPE_TLSGD) |
| 8741 | off += size / 8; |
| 8742 | if (off == got_indx * (size / 8)) |
| 8743 | { |
| 8744 | if (got_type == GOT_TYPE_TPREL) |
| 8745 | return -tp_offset; |
| 8746 | else |
| 8747 | return -dtp_offset; |
| 8748 | } |
| 8749 | } |
| 8750 | } |
| 8751 | gold_unreachable(); |
| 8752 | } |
| 8753 | |
| 8754 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 8755 | // for global tls symbol GSYM. |
| 8756 | template<int size, bool big_endian> |
| 8757 | int64_t |
| 8758 | Target_powerpc<size, big_endian>::do_tls_offset_for_global( |
| 8759 | Symbol* gsym, |
| 8760 | unsigned int got_indx) const |
| 8761 | { |
| 8762 | if (gsym->type() == elfcpp::STT_TLS) |
| 8763 | { |
| 8764 | for (Got_type got_type = GOT_TYPE_TLSGD; |
| 8765 | got_type <= GOT_TYPE_TPREL; |
| 8766 | got_type = Got_type(got_type + 1)) |
| 8767 | if (gsym->has_got_offset(got_type)) |
| 8768 | { |
| 8769 | unsigned int off = gsym->got_offset(got_type); |
| 8770 | if (got_type == GOT_TYPE_TLSGD) |
| 8771 | off += size / 8; |
| 8772 | if (off == got_indx * (size / 8)) |
| 8773 | { |
| 8774 | if (got_type == GOT_TYPE_TPREL) |
| 8775 | return -tp_offset; |
| 8776 | else |
| 8777 | return -dtp_offset; |
| 8778 | } |
| 8779 | } |
| 8780 | } |
| 8781 | gold_unreachable(); |
| 8782 | } |
| 8783 | |
| 8784 | // The selector for powerpc object files. |
| 8785 | |
| 8786 | template<int size, bool big_endian> |
| 8787 | class Target_selector_powerpc : public Target_selector |
| 8788 | { |
| 8789 | public: |
| 8790 | Target_selector_powerpc() |
| 8791 | : Target_selector(size == 64 ? elfcpp::EM_PPC64 : elfcpp::EM_PPC, |
| 8792 | size, big_endian, |
| 8793 | (size == 64 |
| 8794 | ? (big_endian ? "elf64-powerpc" : "elf64-powerpcle") |
| 8795 | : (big_endian ? "elf32-powerpc" : "elf32-powerpcle")), |
| 8796 | (size == 64 |
| 8797 | ? (big_endian ? "elf64ppc" : "elf64lppc") |
| 8798 | : (big_endian ? "elf32ppc" : "elf32lppc"))) |
| 8799 | { } |
| 8800 | |
| 8801 | virtual Target* |
| 8802 | do_instantiate_target() |
| 8803 | { return new Target_powerpc<size, big_endian>(); } |
| 8804 | }; |
| 8805 | |
| 8806 | Target_selector_powerpc<32, true> target_selector_ppc32; |
| 8807 | Target_selector_powerpc<32, false> target_selector_ppc32le; |
| 8808 | Target_selector_powerpc<64, true> target_selector_ppc64; |
| 8809 | Target_selector_powerpc<64, false> target_selector_ppc64le; |
| 8810 | |
| 8811 | // Instantiate these constants for -O0 |
| 8812 | template<int size, bool big_endian> |
| 8813 | const int Output_data_glink<size, big_endian>::pltresolve_size; |
| 8814 | template<int size, bool big_endian> |
| 8815 | const typename Output_data_glink<size, big_endian>::Address |
| 8816 | Output_data_glink<size, big_endian>::invalid_address; |
| 8817 | template<int size, bool big_endian> |
| 8818 | const typename Stub_table<size, big_endian>::Address |
| 8819 | Stub_table<size, big_endian>::invalid_address; |
| 8820 | template<int size, bool big_endian> |
| 8821 | const typename Target_powerpc<size, big_endian>::Address |
| 8822 | Target_powerpc<size, big_endian>::invalid_address; |
| 8823 | |
| 8824 | } // End anonymous namespace. |