| 1 | // s390.cc -- s390 target support for gold. |
| 2 | |
| 3 | // Copyright (C) 2015-2016 Free Software Foundation, Inc. |
| 4 | // Written by Marcin KoĆcielnicki <koriakin@0x04.net>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cstring> |
| 26 | |
| 27 | #include "elfcpp.h" |
| 28 | #include "dwarf.h" |
| 29 | #include "parameters.h" |
| 30 | #include "reloc.h" |
| 31 | #include "s390.h" |
| 32 | #include "object.h" |
| 33 | #include "symtab.h" |
| 34 | #include "layout.h" |
| 35 | #include "output.h" |
| 36 | #include "copy-relocs.h" |
| 37 | #include "target.h" |
| 38 | #include "target-reloc.h" |
| 39 | #include "target-select.h" |
| 40 | #include "tls.h" |
| 41 | #include "gc.h" |
| 42 | #include "icf.h" |
| 43 | |
| 44 | namespace |
| 45 | { |
| 46 | |
| 47 | using namespace gold; |
| 48 | |
| 49 | // A class to handle the .got.plt section. |
| 50 | |
| 51 | template<int size> |
| 52 | class Output_data_got_plt_s390 : public Output_section_data_build |
| 53 | { |
| 54 | public: |
| 55 | Output_data_got_plt_s390(Layout* layout) |
| 56 | : Output_section_data_build(size/8), |
| 57 | layout_(layout) |
| 58 | { } |
| 59 | |
| 60 | Output_data_got_plt_s390(Layout* layout, off_t data_size) |
| 61 | : Output_section_data_build(data_size, size/8), |
| 62 | layout_(layout) |
| 63 | { } |
| 64 | |
| 65 | protected: |
| 66 | // Write out the PLT data. |
| 67 | void |
| 68 | do_write(Output_file*); |
| 69 | |
| 70 | // Write to a map file. |
| 71 | void |
| 72 | do_print_to_mapfile(Mapfile* mapfile) const |
| 73 | { mapfile->print_output_data(this, "** GOT PLT"); } |
| 74 | |
| 75 | private: |
| 76 | // A pointer to the Layout class, so that we can find the .dynamic |
| 77 | // section when we write out the GOT PLT section. |
| 78 | Layout* layout_; |
| 79 | }; |
| 80 | |
| 81 | // A class to handle the PLT data. |
| 82 | |
| 83 | template<int size> |
| 84 | class Output_data_plt_s390 : public Output_section_data |
| 85 | { |
| 86 | public: |
| 87 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, true> |
| 88 | Reloc_section; |
| 89 | |
| 90 | Output_data_plt_s390(Layout* layout, |
| 91 | Output_data_got<size, true>* got, |
| 92 | Output_data_got_plt_s390<size>* got_plt, |
| 93 | Output_data_space* got_irelative) |
| 94 | : Output_section_data(4), layout_(layout), |
| 95 | irelative_rel_(NULL), got_(got), got_plt_(got_plt), |
| 96 | got_irelative_(got_irelative), count_(0), |
| 97 | irelative_count_(0), free_list_() |
| 98 | { this->init(layout); } |
| 99 | |
| 100 | Output_data_plt_s390(Layout* layout, |
| 101 | Output_data_got<size, true>* got, |
| 102 | Output_data_got_plt_s390<size>* got_plt, |
| 103 | Output_data_space* got_irelative, |
| 104 | unsigned int plt_count) |
| 105 | : Output_section_data((plt_count + 1) * plt_entry_size, |
| 106 | 4, false), |
| 107 | layout_(layout), irelative_rel_(NULL), got_(got), |
| 108 | got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count), |
| 109 | irelative_count_(0), free_list_() |
| 110 | { |
| 111 | this->init(layout); |
| 112 | |
| 113 | // Initialize the free list and reserve the first entry. |
| 114 | this->free_list_.init((plt_count + 1) * plt_entry_size, false); |
| 115 | this->free_list_.remove(0, plt_entry_size); |
| 116 | } |
| 117 | |
| 118 | // Initialize the PLT section. |
| 119 | void |
| 120 | init(Layout* layout); |
| 121 | |
| 122 | // Add an entry to the PLT. |
| 123 | void |
| 124 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
| 125 | |
| 126 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. |
| 127 | unsigned int |
| 128 | add_local_ifunc_entry(Symbol_table*, Layout*, |
| 129 | Sized_relobj_file<size, true>*, unsigned int); |
| 130 | |
| 131 | // Add the relocation for a PLT entry. |
| 132 | void |
| 133 | add_relocation(Symbol_table*, Layout*, Symbol*, unsigned int); |
| 134 | |
| 135 | // Return the .rela.plt section data. |
| 136 | Reloc_section* |
| 137 | rela_plt() |
| 138 | { return this->rel_; } |
| 139 | |
| 140 | // Return where the IRELATIVE relocations should go in the PLT |
| 141 | // relocations. |
| 142 | Reloc_section* |
| 143 | rela_irelative(Symbol_table*, Layout*); |
| 144 | |
| 145 | // Return whether we created a section for IRELATIVE relocations. |
| 146 | bool |
| 147 | has_irelative_section() const |
| 148 | { return this->irelative_rel_ != NULL; } |
| 149 | |
| 150 | // Return the number of PLT entries. |
| 151 | unsigned int |
| 152 | entry_count() const |
| 153 | { return this->count_ + this->irelative_count_; } |
| 154 | |
| 155 | // Return the offset of the first non-reserved PLT entry. |
| 156 | unsigned int |
| 157 | first_plt_entry_offset() |
| 158 | { return plt_entry_size; } |
| 159 | |
| 160 | // Return the size of a PLT entry. |
| 161 | unsigned int |
| 162 | get_plt_entry_size() const |
| 163 | { return plt_entry_size; } |
| 164 | |
| 165 | // Reserve a slot in the PLT for an existing symbol in an incremental update. |
| 166 | void |
| 167 | reserve_slot(unsigned int plt_index) |
| 168 | { |
| 169 | this->free_list_.remove((plt_index + 1) * plt_entry_size, |
| 170 | (plt_index + 2) * plt_entry_size); |
| 171 | } |
| 172 | |
| 173 | // Return the PLT address to use for a global symbol. |
| 174 | uint64_t |
| 175 | address_for_global(const Symbol*); |
| 176 | |
| 177 | // Return the PLT address to use for a local symbol. |
| 178 | uint64_t |
| 179 | address_for_local(const Relobj*, unsigned int symndx); |
| 180 | |
| 181 | // Add .eh_frame information for the PLT. |
| 182 | void |
| 183 | add_eh_frame(Layout* layout) |
| 184 | { |
| 185 | (void)layout; |
| 186 | layout->add_eh_frame_for_plt(this, |
| 187 | plt_eh_frame_cie, |
| 188 | plt_eh_frame_cie_size, |
| 189 | plt_eh_frame_fde, |
| 190 | plt_eh_frame_fde_size); |
| 191 | } |
| 192 | |
| 193 | protected: |
| 194 | // Fill in the first PLT entry. |
| 195 | void |
| 196 | fill_first_plt_entry(unsigned char* pov, |
| 197 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, |
| 198 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address); |
| 199 | |
| 200 | // Fill in a normal PLT entry. Returns the offset into the entry that |
| 201 | // should be the initial GOT slot value. |
| 202 | unsigned int |
| 203 | fill_plt_entry(unsigned char* pov, |
| 204 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, |
| 205 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, |
| 206 | unsigned int got_offset, |
| 207 | unsigned int plt_offset, |
| 208 | unsigned int plt_rel_offset); |
| 209 | |
| 210 | void |
| 211 | do_adjust_output_section(Output_section* os); |
| 212 | |
| 213 | // Write to a map file. |
| 214 | void |
| 215 | do_print_to_mapfile(Mapfile* mapfile) const |
| 216 | { mapfile->print_output_data(this, _("** PLT")); } |
| 217 | |
| 218 | private: |
| 219 | // Set the final size. |
| 220 | void |
| 221 | set_final_data_size(); |
| 222 | |
| 223 | // Write out the PLT data. |
| 224 | void |
| 225 | do_write(Output_file*); |
| 226 | |
| 227 | // A pointer to the Layout class, so that we can find the .dynamic |
| 228 | // section when we write out the GOT PLT section. |
| 229 | Layout* layout_; |
| 230 | // The reloc section. |
| 231 | Reloc_section* rel_; |
| 232 | // The IRELATIVE relocs, if necessary. These must follow the |
| 233 | // regular PLT relocations. |
| 234 | Reloc_section* irelative_rel_; |
| 235 | // The .got section. |
| 236 | Output_data_got<size, true>* got_; |
| 237 | // The .got.plt section. |
| 238 | Output_data_got_plt_s390<size>* got_plt_; |
| 239 | // The part of the .got.plt section used for IRELATIVE relocs. |
| 240 | Output_data_space* got_irelative_; |
| 241 | // The number of PLT entries. |
| 242 | unsigned int count_; |
| 243 | // Number of PLT entries with R_TILEGX_IRELATIVE relocs. These |
| 244 | // follow the regular PLT entries. |
| 245 | unsigned int irelative_count_; |
| 246 | // List of available regions within the section, for incremental |
| 247 | // update links. |
| 248 | Free_list free_list_; |
| 249 | |
| 250 | // The size of an entry in the PLT. |
| 251 | static const int plt_entry_size = 0x20; |
| 252 | // The first entry in the PLT. |
| 253 | static const unsigned char first_plt_entry_32_abs[plt_entry_size]; |
| 254 | static const unsigned char first_plt_entry_32_pic[plt_entry_size]; |
| 255 | static const unsigned char first_plt_entry_64[plt_entry_size]; |
| 256 | // Other entries in the PLT for an executable. |
| 257 | static const unsigned char plt_entry_32_abs[plt_entry_size]; |
| 258 | static const unsigned char plt_entry_32_pic12[plt_entry_size]; |
| 259 | static const unsigned char plt_entry_32_pic16[plt_entry_size]; |
| 260 | static const unsigned char plt_entry_32_pic[plt_entry_size]; |
| 261 | static const unsigned char plt_entry_64[plt_entry_size]; |
| 262 | |
| 263 | // The .eh_frame unwind information for the PLT. |
| 264 | static const int plt_eh_frame_cie_size = 12; |
| 265 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; |
| 266 | static const int plt_eh_frame_fde_size = 12; |
| 267 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; |
| 268 | }; |
| 269 | |
| 270 | |
| 271 | template<int size> |
| 272 | class Target_s390 : public Sized_target<size, true> |
| 273 | { |
| 274 | public: |
| 275 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, true> Reloc_section; |
| 276 | |
| 277 | Target_s390() |
| 278 | : Sized_target<size, true>(&s390_info), |
| 279 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
| 280 | global_offset_table_(NULL), rela_dyn_(NULL), |
| 281 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_390_COPY), |
| 282 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false), |
| 283 | layout_(NULL) |
| 284 | { } |
| 285 | |
| 286 | // Scan the relocations to look for symbol adjustments. |
| 287 | void |
| 288 | gc_process_relocs(Symbol_table* symtab, |
| 289 | Layout* layout, |
| 290 | Sized_relobj_file<size, true>* object, |
| 291 | unsigned int data_shndx, |
| 292 | unsigned int sh_type, |
| 293 | const unsigned char* prelocs, |
| 294 | size_t reloc_count, |
| 295 | Output_section* output_section, |
| 296 | bool needs_special_offset_handling, |
| 297 | size_t local_symbol_count, |
| 298 | const unsigned char* plocal_symbols); |
| 299 | |
| 300 | // Scan the relocations to look for symbol adjustments. |
| 301 | void |
| 302 | scan_relocs(Symbol_table* symtab, |
| 303 | Layout* layout, |
| 304 | Sized_relobj_file<size, true>* object, |
| 305 | unsigned int data_shndx, |
| 306 | unsigned int sh_type, |
| 307 | const unsigned char* prelocs, |
| 308 | size_t reloc_count, |
| 309 | Output_section* output_section, |
| 310 | bool needs_special_offset_handling, |
| 311 | size_t local_symbol_count, |
| 312 | const unsigned char* plocal_symbols); |
| 313 | |
| 314 | // Finalize the sections. |
| 315 | void |
| 316 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
| 317 | |
| 318 | // Return the value to use for a dynamic which requires special |
| 319 | // treatment. |
| 320 | uint64_t |
| 321 | do_dynsym_value(const Symbol*) const; |
| 322 | |
| 323 | // Relocate a section. |
| 324 | void |
| 325 | relocate_section(const Relocate_info<size, true>*, |
| 326 | unsigned int sh_type, |
| 327 | const unsigned char* prelocs, |
| 328 | size_t reloc_count, |
| 329 | Output_section* output_section, |
| 330 | bool needs_special_offset_handling, |
| 331 | unsigned char* view, |
| 332 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 333 | section_size_type view_size, |
| 334 | const Reloc_symbol_changes*); |
| 335 | |
| 336 | // Scan the relocs during a relocatable link. |
| 337 | void |
| 338 | scan_relocatable_relocs(Symbol_table* symtab, |
| 339 | Layout* layout, |
| 340 | Sized_relobj_file<size, true>* object, |
| 341 | unsigned int data_shndx, |
| 342 | unsigned int sh_type, |
| 343 | const unsigned char* prelocs, |
| 344 | size_t reloc_count, |
| 345 | Output_section* output_section, |
| 346 | bool needs_special_offset_handling, |
| 347 | size_t local_symbol_count, |
| 348 | const unsigned char* plocal_symbols, |
| 349 | Relocatable_relocs*); |
| 350 | |
| 351 | // Scan the relocs for --emit-relocs. |
| 352 | void |
| 353 | emit_relocs_scan(Symbol_table* symtab, |
| 354 | Layout* layout, |
| 355 | Sized_relobj_file<size, true>* object, |
| 356 | unsigned int data_shndx, |
| 357 | unsigned int sh_type, |
| 358 | const unsigned char* prelocs, |
| 359 | size_t reloc_count, |
| 360 | Output_section* output_section, |
| 361 | bool needs_special_offset_handling, |
| 362 | size_t local_symbol_count, |
| 363 | const unsigned char* plocal_syms, |
| 364 | Relocatable_relocs* rr); |
| 365 | |
| 366 | // Return a string used to fill a code section with nops. |
| 367 | std::string |
| 368 | do_code_fill(section_size_type length) const; |
| 369 | |
| 370 | // Emit relocations for a section. |
| 371 | void |
| 372 | relocate_relocs( |
| 373 | const Relocate_info<size, true>*, |
| 374 | unsigned int sh_type, |
| 375 | const unsigned char* prelocs, |
| 376 | size_t reloc_count, |
| 377 | Output_section* output_section, |
| 378 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 379 | unsigned char* view, |
| 380 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 381 | section_size_type view_size, |
| 382 | unsigned char* reloc_view, |
| 383 | section_size_type reloc_view_size); |
| 384 | |
| 385 | // Return whether SYM is defined by the ABI. |
| 386 | bool |
| 387 | do_is_defined_by_abi(const Symbol* sym) const |
| 388 | { return strcmp(sym->name(), "__tls_get_offset") == 0; } |
| 389 | |
| 390 | // Return the PLT address to use for a global symbol. |
| 391 | uint64_t |
| 392 | do_plt_address_for_global(const Symbol* gsym) const |
| 393 | { return this->plt_section()->address_for_global(gsym); } |
| 394 | |
| 395 | uint64_t |
| 396 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const |
| 397 | { return this->plt_section()->address_for_local(relobj, symndx); } |
| 398 | |
| 399 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 400 | // for a local tls symbol specified by OBJECT, SYMNDX. |
| 401 | int64_t |
| 402 | do_tls_offset_for_local(const Relobj* object, |
| 403 | unsigned int symndx, |
| 404 | unsigned int got_indx) const; |
| 405 | |
| 406 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 407 | // for global tls symbol GSYM. |
| 408 | int64_t |
| 409 | do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const; |
| 410 | |
| 411 | // This function should be defined in targets that can use relocation |
| 412 | // types to determine (implemented in local_reloc_may_be_function_pointer |
| 413 | // and global_reloc_may_be_function_pointer) |
| 414 | // if a function's pointer is taken. ICF uses this in safe mode to only |
| 415 | // fold those functions whose pointer is defintely not taken. |
| 416 | bool |
| 417 | do_can_check_for_function_pointers() const |
| 418 | { return true; } |
| 419 | |
| 420 | // Return whether SYM is call to a non-split function. |
| 421 | bool |
| 422 | do_is_call_to_non_split(const Symbol* sym, const unsigned char* preloc, |
| 423 | const unsigned char* view, |
| 424 | section_size_type view_size) const; |
| 425 | |
| 426 | // Adjust -fsplit-stack code which calls non-split-stack code. |
| 427 | void |
| 428 | do_calls_non_split(Relobj* object, unsigned int shndx, |
| 429 | section_offset_type fnoffset, section_size_type fnsize, |
| 430 | const unsigned char* prelocs, size_t reloc_count, |
| 431 | unsigned char* view, section_size_type view_size, |
| 432 | std::string* from, std::string* to) const; |
| 433 | |
| 434 | // Return the size of the GOT section. |
| 435 | section_size_type |
| 436 | got_size() const |
| 437 | { |
| 438 | gold_assert(this->got_ != NULL); |
| 439 | return this->got_->data_size(); |
| 440 | } |
| 441 | |
| 442 | // Return the number of entries in the GOT. |
| 443 | unsigned int |
| 444 | got_entry_count() const |
| 445 | { |
| 446 | if (this->got_ == NULL) |
| 447 | return 0; |
| 448 | return this->got_size() / (size / 8); |
| 449 | } |
| 450 | |
| 451 | // Return the number of entries in the PLT. |
| 452 | unsigned int |
| 453 | plt_entry_count() const; |
| 454 | |
| 455 | // Return the offset of the first non-reserved PLT entry. |
| 456 | unsigned int |
| 457 | first_plt_entry_offset() const; |
| 458 | |
| 459 | // Return the size of each PLT entry. |
| 460 | unsigned int |
| 461 | plt_entry_size() const; |
| 462 | |
| 463 | // Create the GOT section for an incremental update. |
| 464 | Output_data_got_base* |
| 465 | init_got_plt_for_update(Symbol_table* symtab, |
| 466 | Layout* layout, |
| 467 | unsigned int got_count, |
| 468 | unsigned int plt_count); |
| 469 | |
| 470 | // Reserve a GOT entry for a local symbol, and regenerate any |
| 471 | // necessary dynamic relocations. |
| 472 | void |
| 473 | reserve_local_got_entry(unsigned int got_index, |
| 474 | Sized_relobj<size, true>* obj, |
| 475 | unsigned int r_sym, |
| 476 | unsigned int got_type); |
| 477 | |
| 478 | // Reserve a GOT entry for a global symbol, and regenerate any |
| 479 | // necessary dynamic relocations. |
| 480 | void |
| 481 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, |
| 482 | unsigned int got_type); |
| 483 | |
| 484 | // Register an existing PLT entry for a global symbol. |
| 485 | void |
| 486 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
| 487 | Symbol* gsym); |
| 488 | |
| 489 | // Force a COPY relocation for a given symbol. |
| 490 | void |
| 491 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); |
| 492 | |
| 493 | // Apply an incremental relocation. |
| 494 | void |
| 495 | apply_relocation(const Relocate_info<size, true>* relinfo, |
| 496 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, |
| 497 | unsigned int r_type, |
| 498 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
| 499 | const Symbol* gsym, |
| 500 | unsigned char* view, |
| 501 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 502 | section_size_type view_size); |
| 503 | |
| 504 | private: |
| 505 | |
| 506 | // The class which scans relocations. |
| 507 | class Scan |
| 508 | { |
| 509 | public: |
| 510 | Scan() |
| 511 | : issued_non_pic_error_(false) |
| 512 | { } |
| 513 | |
| 514 | static inline int |
| 515 | get_reference_flags(unsigned int r_type); |
| 516 | |
| 517 | inline void |
| 518 | local(Symbol_table* symtab, Layout* layout, Target_s390* target, |
| 519 | Sized_relobj_file<size, true>* object, |
| 520 | unsigned int data_shndx, |
| 521 | Output_section* output_section, |
| 522 | const elfcpp::Rela<size, true>& reloc, unsigned int r_type, |
| 523 | const elfcpp::Sym<size, true>& lsym, |
| 524 | bool is_discarded); |
| 525 | |
| 526 | inline void |
| 527 | global(Symbol_table* symtab, Layout* layout, Target_s390* target, |
| 528 | Sized_relobj_file<size, true>* object, |
| 529 | unsigned int data_shndx, |
| 530 | Output_section* output_section, |
| 531 | const elfcpp::Rela<size, true>& reloc, unsigned int r_type, |
| 532 | Symbol* gsym); |
| 533 | |
| 534 | inline bool |
| 535 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
| 536 | Target_s390* target, |
| 537 | Sized_relobj_file<size, true>* object, |
| 538 | unsigned int data_shndx, |
| 539 | Output_section* output_section, |
| 540 | const elfcpp::Rela<size, true>& reloc, |
| 541 | unsigned int r_type, |
| 542 | const elfcpp::Sym<size, true>& lsym); |
| 543 | |
| 544 | inline bool |
| 545 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, |
| 546 | Target_s390* target, |
| 547 | Sized_relobj_file<size, true>* object, |
| 548 | unsigned int data_shndx, |
| 549 | Output_section* output_section, |
| 550 | const elfcpp::Rela<size, true>& reloc, |
| 551 | unsigned int r_type, |
| 552 | Symbol* gsym); |
| 553 | |
| 554 | private: |
| 555 | static void |
| 556 | unsupported_reloc_local(Sized_relobj_file<size, true>*, |
| 557 | unsigned int r_type); |
| 558 | |
| 559 | static void |
| 560 | unsupported_reloc_global(Sized_relobj_file<size, true>*, |
| 561 | unsigned int r_type, Symbol*); |
| 562 | |
| 563 | void |
| 564 | check_non_pic(Relobj*, unsigned int r_type); |
| 565 | |
| 566 | inline bool |
| 567 | possible_function_pointer_reloc(unsigned int r_type); |
| 568 | |
| 569 | bool |
| 570 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, true>*, |
| 571 | unsigned int r_type); |
| 572 | |
| 573 | // Whether we have issued an error about a non-PIC compilation. |
| 574 | bool issued_non_pic_error_; |
| 575 | }; |
| 576 | |
| 577 | // The class which implements relocation. |
| 578 | class Relocate |
| 579 | { |
| 580 | public: |
| 581 | // Do a relocation. Return false if the caller should not issue |
| 582 | // any warnings about this relocation. |
| 583 | inline bool |
| 584 | relocate(const Relocate_info<size, true>*, unsigned int, |
| 585 | Target_s390*, Output_section*, size_t, const unsigned char*, |
| 586 | const Sized_symbol<size>*, const Symbol_value<size>*, |
| 587 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
| 588 | section_size_type); |
| 589 | |
| 590 | private: |
| 591 | // Do a TLS relocation. |
| 592 | inline typename elfcpp::Elf_types<size>::Elf_Addr |
| 593 | relocate_tls(const Relocate_info<size, true>*, Target_s390*, |
| 594 | size_t relnum, const elfcpp::Rela<size, true>&, |
| 595 | unsigned int r_type, const Sized_symbol<size>*, |
| 596 | const Symbol_value<size>*, |
| 597 | unsigned char*, section_size_type); |
| 598 | |
| 599 | // Do a TLS General-Dynamic to Initial-Exec transition. |
| 600 | inline void |
| 601 | tls_gd_to_ie(const Relocate_info<size, true>*, size_t relnum, |
| 602 | const elfcpp::Rela<size, true>&, |
| 603 | unsigned char* view, |
| 604 | section_size_type view_size); |
| 605 | |
| 606 | // Do a TLS General-Dynamic to Local-Exec transition. |
| 607 | inline void |
| 608 | tls_gd_to_le(const Relocate_info<size, true>*, size_t relnum, |
| 609 | const elfcpp::Rela<size, true>&, |
| 610 | unsigned char* view, |
| 611 | section_size_type view_size); |
| 612 | |
| 613 | // Do a TLS Local-Dynamic to Local-Exec transition. |
| 614 | inline void |
| 615 | tls_ld_to_le(const Relocate_info<size, true>*, size_t relnum, |
| 616 | const elfcpp::Rela<size, true>&, |
| 617 | unsigned char* view, |
| 618 | section_size_type view_size); |
| 619 | |
| 620 | // Do a TLS Initial-Exec to Local-Exec transition. |
| 621 | static inline void |
| 622 | tls_ie_to_le(const Relocate_info<size, true>*, size_t relnum, |
| 623 | const elfcpp::Rela<size, true>&, |
| 624 | unsigned char* view, |
| 625 | section_size_type view_size); |
| 626 | }; |
| 627 | |
| 628 | // Adjust TLS relocation type based on the options and whether this |
| 629 | // is a local symbol. |
| 630 | static tls::Tls_optimization |
| 631 | optimize_tls_reloc(bool is_final, int r_type); |
| 632 | |
| 633 | // Get the GOT section. |
| 634 | const Output_data_got<size, true>* |
| 635 | got_section() const |
| 636 | { |
| 637 | gold_assert(this->got_ != NULL); |
| 638 | return this->got_; |
| 639 | } |
| 640 | |
| 641 | // Get the GOT section, creating it if necessary. |
| 642 | Output_data_got<size, true>* |
| 643 | got_section(Symbol_table*, Layout*); |
| 644 | |
| 645 | typename elfcpp::Elf_types<size>::Elf_Addr |
| 646 | got_address() const |
| 647 | { |
| 648 | gold_assert(this->got_ != NULL); |
| 649 | return this->got_plt_->address(); |
| 650 | } |
| 651 | |
| 652 | typename elfcpp::Elf_types<size>::Elf_Addr |
| 653 | got_main_offset() const |
| 654 | { |
| 655 | gold_assert(this->got_ != NULL); |
| 656 | return this->got_->address() - this->got_address(); |
| 657 | } |
| 658 | |
| 659 | // Create the PLT section. |
| 660 | void |
| 661 | make_plt_section(Symbol_table* symtab, Layout* layout); |
| 662 | |
| 663 | // Create a PLT entry for a global symbol. |
| 664 | void |
| 665 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
| 666 | |
| 667 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
| 668 | void |
| 669 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, |
| 670 | Sized_relobj_file<size, true>* relobj, |
| 671 | unsigned int local_sym_index); |
| 672 | |
| 673 | // Create a GOT entry for the TLS module index. |
| 674 | unsigned int |
| 675 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
| 676 | Sized_relobj_file<size, true>* object); |
| 677 | |
| 678 | // Get the PLT section. |
| 679 | Output_data_plt_s390<size>* |
| 680 | plt_section() const |
| 681 | { |
| 682 | gold_assert(this->plt_ != NULL); |
| 683 | return this->plt_; |
| 684 | } |
| 685 | |
| 686 | // Get the dynamic reloc section, creating it if necessary. |
| 687 | Reloc_section* |
| 688 | rela_dyn_section(Layout*); |
| 689 | |
| 690 | // Get the section to use for IRELATIVE relocations. |
| 691 | Reloc_section* |
| 692 | rela_irelative_section(Layout*); |
| 693 | |
| 694 | // Add a potential copy relocation. |
| 695 | void |
| 696 | copy_reloc(Symbol_table* symtab, Layout* layout, |
| 697 | Sized_relobj_file<size, true>* object, |
| 698 | unsigned int shndx, Output_section* output_section, |
| 699 | Symbol* sym, const elfcpp::Rela<size, true>& reloc) |
| 700 | { |
| 701 | unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info()); |
| 702 | this->copy_relocs_.copy_reloc(symtab, layout, |
| 703 | symtab->get_sized_symbol<size>(sym), |
| 704 | object, shndx, output_section, |
| 705 | r_type, reloc.get_r_offset(), |
| 706 | reloc.get_r_addend(), |
| 707 | this->rela_dyn_section(layout)); |
| 708 | } |
| 709 | |
| 710 | // A function for targets to call. Return whether BYTES/LEN matches |
| 711 | // VIEW/VIEW_SIZE at OFFSET. Like the one in Target, but takes |
| 712 | // an unsigned char * parameter. |
| 713 | bool |
| 714 | match_view_u(const unsigned char* view, section_size_type view_size, |
| 715 | section_offset_type offset, const unsigned char* bytes, size_t len) const |
| 716 | { |
| 717 | return this->match_view(view, view_size, offset, |
| 718 | reinterpret_cast<const char*>(bytes), len); |
| 719 | } |
| 720 | |
| 721 | // Information about this specific target which we pass to the |
| 722 | // general Target structure. |
| 723 | static Target::Target_info s390_info; |
| 724 | |
| 725 | // The types of GOT entries needed for this platform. |
| 726 | // These values are exposed to the ABI in an incremental link. |
| 727 | // Do not renumber existing values without changing the version |
| 728 | // number of the .gnu_incremental_inputs section. |
| 729 | enum Got_type |
| 730 | { |
| 731 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol |
| 732 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset |
| 733 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair |
| 734 | }; |
| 735 | |
| 736 | // The GOT section. |
| 737 | Output_data_got<size, true>* got_; |
| 738 | // The PLT section. |
| 739 | Output_data_plt_s390<size>* plt_; |
| 740 | // The GOT PLT section. |
| 741 | Output_data_got_plt_s390<size>* got_plt_; |
| 742 | // The GOT section for IRELATIVE relocations. |
| 743 | Output_data_space* got_irelative_; |
| 744 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
| 745 | Symbol* global_offset_table_; |
| 746 | // The dynamic reloc section. |
| 747 | Reloc_section* rela_dyn_; |
| 748 | // The section to use for IRELATIVE relocs. |
| 749 | Reloc_section* rela_irelative_; |
| 750 | // Relocs saved to avoid a COPY reloc. |
| 751 | Copy_relocs<elfcpp::SHT_RELA, size, true> copy_relocs_; |
| 752 | // Offset of the GOT entry for the TLS module index. |
| 753 | unsigned int got_mod_index_offset_; |
| 754 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
| 755 | bool tls_base_symbol_defined_; |
| 756 | // For use in do_tls_offset_for_* |
| 757 | Layout *layout_; |
| 758 | |
| 759 | // Code sequences for -fsplit-stack matching. |
| 760 | static const unsigned char ss_code_bras_8[]; |
| 761 | static const unsigned char ss_code_l_basr[]; |
| 762 | static const unsigned char ss_code_a_basr[]; |
| 763 | static const unsigned char ss_code_larl[]; |
| 764 | static const unsigned char ss_code_brasl[]; |
| 765 | static const unsigned char ss_code_jg[]; |
| 766 | static const unsigned char ss_code_jgl[]; |
| 767 | |
| 768 | // Variable code sequence matchers for -fsplit-stack. |
| 769 | bool ss_match_st_r14(unsigned char* view, |
| 770 | section_size_type view_size, |
| 771 | section_offset_type *offset) const; |
| 772 | bool ss_match_l_r14(unsigned char* view, |
| 773 | section_size_type view_size, |
| 774 | section_offset_type *offset) const; |
| 775 | bool ss_match_mcount(unsigned char* view, |
| 776 | section_size_type view_size, |
| 777 | section_offset_type *offset) const; |
| 778 | bool ss_match_ear(unsigned char* view, |
| 779 | section_size_type view_size, |
| 780 | section_offset_type *offset) const; |
| 781 | bool ss_match_c(unsigned char* view, |
| 782 | section_size_type view_size, |
| 783 | section_offset_type *offset) const; |
| 784 | bool ss_match_l(unsigned char* view, |
| 785 | section_size_type view_size, |
| 786 | section_offset_type *offset, |
| 787 | int *guard_reg) const; |
| 788 | bool ss_match_ahi(unsigned char* view, |
| 789 | section_size_type view_size, |
| 790 | section_offset_type *offset, |
| 791 | int guard_reg, |
| 792 | uint32_t *arg) const; |
| 793 | bool ss_match_alfi(unsigned char* view, |
| 794 | section_size_type view_size, |
| 795 | section_offset_type *offset, |
| 796 | int guard_reg, |
| 797 | uint32_t *arg) const; |
| 798 | bool ss_match_cr(unsigned char* view, |
| 799 | section_size_type view_size, |
| 800 | section_offset_type *offset, |
| 801 | int guard_reg) const; |
| 802 | }; |
| 803 | |
| 804 | template<> |
| 805 | Target::Target_info Target_s390<32>::s390_info = |
| 806 | { |
| 807 | 32, // size |
| 808 | true, // is_big_endian |
| 809 | elfcpp::EM_S390, // machine_code |
| 810 | false, // has_make_symbol |
| 811 | false, // has_resolve |
| 812 | true, // has_code_fill |
| 813 | true, // is_default_stack_executable |
| 814 | true, // can_icf_inline_merge_sections |
| 815 | '\0', // wrap_char |
| 816 | "/lib/ld.so.1", // dynamic_linker |
| 817 | 0x00400000, // default_text_segment_address |
| 818 | 4 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 819 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 820 | false, // isolate_execinstr |
| 821 | 0, // rosegment_gap |
| 822 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 823 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 824 | 0, // small_common_section_flags |
| 825 | 0, // large_common_section_flags |
| 826 | NULL, // attributes_section |
| 827 | NULL, // attributes_vendor |
| 828 | "_start", // entry_symbol_name |
| 829 | 32, // hash_entry_size |
| 830 | }; |
| 831 | |
| 832 | template<> |
| 833 | Target::Target_info Target_s390<64>::s390_info = |
| 834 | { |
| 835 | 64, // size |
| 836 | true, // is_big_endian |
| 837 | elfcpp::EM_S390, // machine_code |
| 838 | false, // has_make_symbol |
| 839 | false, // has_resolve |
| 840 | true, // has_code_fill |
| 841 | true, // is_default_stack_executable |
| 842 | true, // can_icf_inline_merge_sections |
| 843 | '\0', // wrap_char |
| 844 | "/lib/ld64.so.1", // dynamic_linker |
| 845 | 0x80000000ll, // default_text_segment_address |
| 846 | 4 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 847 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 848 | false, // isolate_execinstr |
| 849 | 0, // rosegment_gap |
| 850 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 851 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 852 | 0, // small_common_section_flags |
| 853 | 0, // large_common_section_flags |
| 854 | NULL, // attributes_section |
| 855 | NULL, // attributes_vendor |
| 856 | "_start", // entry_symbol_name |
| 857 | 64, // hash_entry_size |
| 858 | }; |
| 859 | |
| 860 | template<int size> |
| 861 | class S390_relocate_functions |
| 862 | { |
| 863 | public: |
| 864 | enum Overflow_check |
| 865 | { |
| 866 | CHECK_NONE, |
| 867 | CHECK_SIGNED, |
| 868 | CHECK_UNSIGNED, |
| 869 | CHECK_BITFIELD, |
| 870 | CHECK_LOW_INSN, |
| 871 | CHECK_HIGH_INSN |
| 872 | }; |
| 873 | |
| 874 | enum Status |
| 875 | { |
| 876 | STATUS_OK, |
| 877 | STATUS_OVERFLOW |
| 878 | }; |
| 879 | |
| 880 | private: |
| 881 | typedef S390_relocate_functions<size> This; |
| 882 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 883 | |
| 884 | template<int valsize> |
| 885 | static inline bool |
| 886 | has_overflow_signed(Address value) |
| 887 | { |
| 888 | // limit = 1 << (valsize - 1) without shift count exceeding size of type |
| 889 | Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| 890 | limit <<= ((valsize - 1) >> 1); |
| 891 | limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| 892 | return value + limit > (limit << 1) - 1; |
| 893 | } |
| 894 | |
| 895 | template<int valsize> |
| 896 | static inline bool |
| 897 | has_overflow_unsigned(Address value) |
| 898 | { |
| 899 | Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1); |
| 900 | limit <<= ((valsize - 1) >> 1); |
| 901 | limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1)); |
| 902 | return value > (limit << 1) - 1; |
| 903 | } |
| 904 | |
| 905 | template<int fieldsize> |
| 906 | static inline void |
| 907 | rela(unsigned char* view, Address mask, Address value) |
| 908 | { |
| 909 | typedef typename elfcpp::Swap<fieldsize, true>::Valtype Valtype; |
| 910 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 911 | Valtype val = elfcpp::Swap<fieldsize, true>::readval(view); |
| 912 | val &= ~mask; |
| 913 | value &= mask; |
| 914 | elfcpp::Swap<fieldsize, true>::writeval(wv, val | value); |
| 915 | } |
| 916 | |
| 917 | public: |
| 918 | // R_390_12, R_390_GOT12, R_390_GOTPLT12, R_390_GOTIE12 |
| 919 | static inline Status |
| 920 | rela12(unsigned char* view, Address value) |
| 921 | { |
| 922 | if (This::template has_overflow_unsigned<12>(value)) |
| 923 | return STATUS_OVERFLOW; |
| 924 | This::template rela<16>(view, 0x0fff, value); |
| 925 | return STATUS_OK; |
| 926 | } |
| 927 | |
| 928 | // R_390_16, R_390_GOT16, R_390_GOTPLT16, R_390_GOTOFF16, R_390_PLTOFF16 |
| 929 | static inline Status |
| 930 | rela16(unsigned char* view, Address value) |
| 931 | { |
| 932 | if (This::template has_overflow_signed<16>(value)) |
| 933 | return STATUS_OVERFLOW; |
| 934 | This::template rela<16>(view, 0xffff, value); |
| 935 | return STATUS_OK; |
| 936 | } |
| 937 | |
| 938 | // R_390_20, R_390_GOT20, R_390_GOTPLT20, R_390_GOTIE20 |
| 939 | static inline Status |
| 940 | rela20(unsigned char* view, Address value) |
| 941 | { |
| 942 | if (This::template has_overflow_signed<20>(value)) |
| 943 | return STATUS_OVERFLOW; |
| 944 | This::template rela<16>(view, 0x0fff, value); |
| 945 | This::template rela<16>(view + 2, 0xff00, value >> (12 - 8)); |
| 946 | return STATUS_OK; |
| 947 | } |
| 948 | |
| 949 | // R_390_PC12DBL, R_390_PLT12DBL |
| 950 | static inline Status |
| 951 | pcrela12dbl(unsigned char* view, Address value, Address address) |
| 952 | { |
| 953 | value -= address; |
| 954 | if ((value & 1) != 0) |
| 955 | return STATUS_OVERFLOW; |
| 956 | if (This::template has_overflow_signed<13>(value)) |
| 957 | return STATUS_OVERFLOW; |
| 958 | value >>= 1; |
| 959 | This::template rela<16>(view, 0x0fff, value); |
| 960 | return STATUS_OK; |
| 961 | } |
| 962 | |
| 963 | // R_390_PC16DBL, R_390_PLT16DBL |
| 964 | static inline Status |
| 965 | pcrela16dbl(unsigned char* view, Address value, Address address) |
| 966 | { |
| 967 | value -= address; |
| 968 | if ((value & 1) != 0) |
| 969 | return STATUS_OVERFLOW; |
| 970 | if (This::template has_overflow_signed<17>(value)) |
| 971 | return STATUS_OVERFLOW; |
| 972 | value >>= 1; |
| 973 | This::template rela<16>(view, 0xffff, value); |
| 974 | return STATUS_OK; |
| 975 | } |
| 976 | |
| 977 | // R_390_PC24DBL, R_390_PLT24DBL |
| 978 | static inline Status |
| 979 | pcrela24dbl(unsigned char* view, Address value, Address address) |
| 980 | { |
| 981 | value -= address; |
| 982 | if ((value & 1) != 0) |
| 983 | return STATUS_OVERFLOW; |
| 984 | if (This::template has_overflow_signed<25>(value)) |
| 985 | return STATUS_OVERFLOW; |
| 986 | value >>= 1; |
| 987 | // Swap doesn't take 24-bit fields well... |
| 988 | This::template rela<8>(view, 0xff, value >> 16); |
| 989 | This::template rela<16>(view + 1, 0xffff, value); |
| 990 | return STATUS_OK; |
| 991 | } |
| 992 | |
| 993 | // R_390_PC32DBL, R_390_PLT32DBL, R_390_GOTPCDBL, R_390_GOTENT, R_390_GOTPLTENT |
| 994 | static inline Status |
| 995 | pcrela32dbl(unsigned char* view, Address value, Address address) |
| 996 | { |
| 997 | Address reloc = value - address; |
| 998 | if ((reloc & 1) != 0) |
| 999 | { |
| 1000 | gold_warning(_("R_390_PC32DBL target misaligned at %llx"), (long long)address); |
| 1001 | // Wait for a fix for https://sourceware.org/bugzilla/show_bug.cgi?id=18960 |
| 1002 | // return STATUS_OVERFLOW; |
| 1003 | } |
| 1004 | if (This::template has_overflow_signed<33>(reloc)) |
| 1005 | return STATUS_OVERFLOW; |
| 1006 | reloc >>= 1; |
| 1007 | if (value < address && size == 32) |
| 1008 | reloc |= 0x80000000; |
| 1009 | This::template rela<32>(view, 0xffffffff, reloc); |
| 1010 | return STATUS_OK; |
| 1011 | } |
| 1012 | |
| 1013 | }; |
| 1014 | |
| 1015 | // Initialize the PLT section. |
| 1016 | |
| 1017 | template<int size> |
| 1018 | void |
| 1019 | Output_data_plt_s390<size>::init(Layout* layout) |
| 1020 | { |
| 1021 | this->rel_ = new Reloc_section(false); |
| 1022 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 1023 | elfcpp::SHF_ALLOC, this->rel_, |
| 1024 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 1025 | } |
| 1026 | |
| 1027 | template<int size> |
| 1028 | void |
| 1029 | Output_data_plt_s390<size>::do_adjust_output_section(Output_section* os) |
| 1030 | { |
| 1031 | os->set_entsize(plt_entry_size); |
| 1032 | } |
| 1033 | |
| 1034 | // Add an entry to the PLT. |
| 1035 | |
| 1036 | template<int size> |
| 1037 | void |
| 1038 | Output_data_plt_s390<size>::add_entry(Symbol_table* symtab, Layout* layout, |
| 1039 | Symbol* gsym) |
| 1040 | { |
| 1041 | gold_assert(!gsym->has_plt_offset()); |
| 1042 | |
| 1043 | unsigned int plt_index; |
| 1044 | off_t plt_offset; |
| 1045 | section_offset_type got_offset; |
| 1046 | |
| 1047 | unsigned int* pcount; |
| 1048 | unsigned int offset; |
| 1049 | unsigned int reserved; |
| 1050 | Output_section_data_build* got; |
| 1051 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 1052 | && gsym->can_use_relative_reloc(false)) |
| 1053 | { |
| 1054 | pcount = &this->irelative_count_; |
| 1055 | offset = 0; |
| 1056 | reserved = 0; |
| 1057 | got = this->got_irelative_; |
| 1058 | } |
| 1059 | else |
| 1060 | { |
| 1061 | pcount = &this->count_; |
| 1062 | offset = 1; |
| 1063 | reserved = 3; |
| 1064 | got = this->got_plt_; |
| 1065 | } |
| 1066 | |
| 1067 | if (!this->is_data_size_valid()) |
| 1068 | { |
| 1069 | // Note that when setting the PLT offset for a non-IRELATIVE |
| 1070 | // entry we skip the initial reserved PLT entry. |
| 1071 | plt_index = *pcount + offset; |
| 1072 | plt_offset = plt_index * plt_entry_size; |
| 1073 | |
| 1074 | ++*pcount; |
| 1075 | |
| 1076 | got_offset = (plt_index - offset + reserved) * size / 8; |
| 1077 | gold_assert(got_offset == got->current_data_size()); |
| 1078 | |
| 1079 | // Every PLT entry needs a GOT entry which points back to the PLT |
| 1080 | // entry (this will be changed by the dynamic linker, normally |
| 1081 | // lazily when the function is called). |
| 1082 | got->set_current_data_size(got_offset + size / 8); |
| 1083 | } |
| 1084 | else |
| 1085 | { |
| 1086 | // FIXME: This is probably not correct for IRELATIVE relocs. |
| 1087 | |
| 1088 | // For incremental updates, find an available slot. |
| 1089 | plt_offset = this->free_list_.allocate(plt_entry_size, |
| 1090 | plt_entry_size, 0); |
| 1091 | if (plt_offset == -1) |
| 1092 | gold_fallback(_("out of patch space (PLT);" |
| 1093 | " relink with --incremental-full")); |
| 1094 | |
| 1095 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset |
| 1096 | // can be calculated from the PLT index, adjusting for the three |
| 1097 | // reserved entries at the beginning of the GOT. |
| 1098 | plt_index = plt_offset / plt_entry_size - 1; |
| 1099 | got_offset = (plt_index - offset + reserved) * size / 8; |
| 1100 | } |
| 1101 | |
| 1102 | gsym->set_plt_offset(plt_offset); |
| 1103 | |
| 1104 | // Every PLT entry needs a reloc. |
| 1105 | this->add_relocation(symtab, layout, gsym, got_offset); |
| 1106 | |
| 1107 | // Note that we don't need to save the symbol. The contents of the |
| 1108 | // PLT are independent of which symbols are used. The symbols only |
| 1109 | // appear in the relocations. |
| 1110 | } |
| 1111 | |
| 1112 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
| 1113 | // the PLT offset. |
| 1114 | |
| 1115 | template<int size> |
| 1116 | unsigned int |
| 1117 | Output_data_plt_s390<size>::add_local_ifunc_entry( |
| 1118 | Symbol_table* symtab, |
| 1119 | Layout* layout, |
| 1120 | Sized_relobj_file<size, true>* relobj, |
| 1121 | unsigned int local_sym_index) |
| 1122 | { |
| 1123 | unsigned int plt_offset = this->irelative_count_ * plt_entry_size; |
| 1124 | ++this->irelative_count_; |
| 1125 | |
| 1126 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
| 1127 | |
| 1128 | // Every PLT entry needs a GOT entry which points back to the PLT |
| 1129 | // entry. |
| 1130 | this->got_irelative_->set_current_data_size(got_offset + size / 8); |
| 1131 | |
| 1132 | // Every PLT entry needs a reloc. |
| 1133 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
| 1134 | rela->add_symbolless_local_addend(relobj, local_sym_index, |
| 1135 | elfcpp::R_390_IRELATIVE, |
| 1136 | this->got_irelative_, got_offset, 0); |
| 1137 | |
| 1138 | return plt_offset; |
| 1139 | } |
| 1140 | |
| 1141 | // Add the relocation for a PLT entry. |
| 1142 | |
| 1143 | template<int size> |
| 1144 | void |
| 1145 | Output_data_plt_s390<size>::add_relocation(Symbol_table* symtab, |
| 1146 | Layout* layout, |
| 1147 | Symbol* gsym, |
| 1148 | unsigned int got_offset) |
| 1149 | { |
| 1150 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 1151 | && gsym->can_use_relative_reloc(false)) |
| 1152 | { |
| 1153 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
| 1154 | rela->add_symbolless_global_addend(gsym, elfcpp::R_390_IRELATIVE, |
| 1155 | this->got_irelative_, got_offset, 0); |
| 1156 | } |
| 1157 | else |
| 1158 | { |
| 1159 | gsym->set_needs_dynsym_entry(); |
| 1160 | this->rel_->add_global(gsym, elfcpp::R_390_JMP_SLOT, this->got_plt_, |
| 1161 | got_offset, 0); |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | // Return where the IRELATIVE relocations should go in the PLT. These |
| 1166 | // follow the JUMP_SLOT and the TLSDESC relocations. |
| 1167 | |
| 1168 | template<int size> |
| 1169 | typename Output_data_plt_s390<size>::Reloc_section* |
| 1170 | Output_data_plt_s390<size>::rela_irelative(Symbol_table* symtab, |
| 1171 | Layout* layout) |
| 1172 | { |
| 1173 | if (this->irelative_rel_ == NULL) |
| 1174 | { |
| 1175 | this->irelative_rel_ = new Reloc_section(false); |
| 1176 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 1177 | elfcpp::SHF_ALLOC, this->irelative_rel_, |
| 1178 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 1179 | gold_assert(this->irelative_rel_->output_section() |
| 1180 | == this->rel_->output_section()); |
| 1181 | |
| 1182 | if (parameters->doing_static_link()) |
| 1183 | { |
| 1184 | // A statically linked executable will only have a .rela.plt |
| 1185 | // section to hold R_390_IRELATIVE relocs for |
| 1186 | // STT_GNU_IFUNC symbols. The library will use these |
| 1187 | // symbols to locate the IRELATIVE relocs at program startup |
| 1188 | // time. |
| 1189 | symtab->define_in_output_data("__rela_iplt_start", NULL, |
| 1190 | Symbol_table::PREDEFINED, |
| 1191 | this->irelative_rel_, 0, 0, |
| 1192 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 1193 | elfcpp::STV_HIDDEN, 0, false, true); |
| 1194 | symtab->define_in_output_data("__rela_iplt_end", NULL, |
| 1195 | Symbol_table::PREDEFINED, |
| 1196 | this->irelative_rel_, 0, 0, |
| 1197 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 1198 | elfcpp::STV_HIDDEN, 0, true, true); |
| 1199 | } |
| 1200 | } |
| 1201 | return this->irelative_rel_; |
| 1202 | } |
| 1203 | |
| 1204 | // Return the PLT address to use for a global symbol. |
| 1205 | |
| 1206 | template<int size> |
| 1207 | uint64_t |
| 1208 | Output_data_plt_s390<size>::address_for_global(const Symbol* gsym) |
| 1209 | { |
| 1210 | uint64_t offset = 0; |
| 1211 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 1212 | && gsym->can_use_relative_reloc(false)) |
| 1213 | offset = (this->count_ + 1) * plt_entry_size; |
| 1214 | return this->address() + offset + gsym->plt_offset(); |
| 1215 | } |
| 1216 | |
| 1217 | // Return the PLT address to use for a local symbol. These are always |
| 1218 | // IRELATIVE relocs. |
| 1219 | |
| 1220 | template<int size> |
| 1221 | uint64_t |
| 1222 | Output_data_plt_s390<size>::address_for_local(const Relobj* object, |
| 1223 | unsigned int r_sym) |
| 1224 | { |
| 1225 | return (this->address() |
| 1226 | + (this->count_ + 1) * plt_entry_size |
| 1227 | + object->local_plt_offset(r_sym)); |
| 1228 | } |
| 1229 | |
| 1230 | // Set the final size. |
| 1231 | template<int size> |
| 1232 | void |
| 1233 | Output_data_plt_s390<size>::set_final_data_size() |
| 1234 | { |
| 1235 | unsigned int count = this->count_ + this->irelative_count_; |
| 1236 | this->set_data_size((count + 1) * plt_entry_size); |
| 1237 | } |
| 1238 | |
| 1239 | template<int size> |
| 1240 | const unsigned char |
| 1241 | Output_data_plt_s390<size>::first_plt_entry_32_abs[plt_entry_size] = |
| 1242 | { |
| 1243 | 0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15) |
| 1244 | 0x0d, 0x10, // basr %r1, %r0 |
| 1245 | 0x58, 0x10, 0x10, 0x12, // l %r1, 18(%r1) |
| 1246 | 0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, // mvc 24(4,%r15), 4(%r1) |
| 1247 | 0x58, 0x10, 0x10, 0x08, // l %r1, 8(%r1) |
| 1248 | 0x07, 0xf1, // br %r1 |
| 1249 | 0x00, 0x00, // padding |
| 1250 | 0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_ (to fill) |
| 1251 | 0x00, 0x00, 0x00, 0x00, // padding |
| 1252 | }; |
| 1253 | |
| 1254 | template<int size> |
| 1255 | const unsigned char |
| 1256 | Output_data_plt_s390<size>::first_plt_entry_32_pic[plt_entry_size] = |
| 1257 | { |
| 1258 | 0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15) |
| 1259 | 0x58, 0x10, 0xc0, 0x04, // l %r1, 4(%r12) |
| 1260 | 0x50, 0x10, 0xf0, 0x18, // st %r1, 24(%r15) |
| 1261 | 0x58, 0x10, 0xc0, 0x08, // l %r1, 8(%r12) |
| 1262 | 0x07, 0xf1, // br %r1 |
| 1263 | 0x00, 0x00, // padding |
| 1264 | 0x00, 0x00, 0x00, 0x00, // padding |
| 1265 | 0x00, 0x00, 0x00, 0x00, // padding |
| 1266 | 0x00, 0x00, 0x00, 0x00, // padding |
| 1267 | }; |
| 1268 | |
| 1269 | template<int size> |
| 1270 | const unsigned char |
| 1271 | Output_data_plt_s390<size>::first_plt_entry_64[plt_entry_size] = |
| 1272 | { |
| 1273 | 0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, // stg %r1, 56(%r15) |
| 1274 | 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_ (to fill) |
| 1275 | 0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, // mvc 48(8,%r15), 8(%r1) |
| 1276 | 0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, // lg %r1, 16(%r1) |
| 1277 | 0x07, 0xf1, // br %r1 |
| 1278 | 0x07, 0x00, // nopr |
| 1279 | 0x07, 0x00, // nopr |
| 1280 | 0x07, 0x00, // nopr |
| 1281 | }; |
| 1282 | |
| 1283 | template<int size> |
| 1284 | void |
| 1285 | Output_data_plt_s390<size>::fill_first_plt_entry( |
| 1286 | unsigned char* pov, |
| 1287 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, |
| 1288 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) |
| 1289 | { |
| 1290 | if (size == 64) |
| 1291 | { |
| 1292 | memcpy(pov, first_plt_entry_64, plt_entry_size); |
| 1293 | S390_relocate_functions<size>::pcrela32dbl(pov + 8, got_address, (plt_address + 6)); |
| 1294 | } |
| 1295 | else if (!parameters->options().output_is_position_independent()) |
| 1296 | { |
| 1297 | memcpy(pov, first_plt_entry_32_abs, plt_entry_size); |
| 1298 | elfcpp::Swap<32, true>::writeval(pov + 24, got_address); |
| 1299 | } |
| 1300 | else |
| 1301 | { |
| 1302 | memcpy(pov, first_plt_entry_32_pic, plt_entry_size); |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | template<int size> |
| 1307 | const unsigned char |
| 1308 | Output_data_plt_s390<size>::plt_entry_32_abs[plt_entry_size] = |
| 1309 | { |
| 1310 | // first part |
| 1311 | 0x0d, 0x10, // basr %r1, %r0 |
| 1312 | 0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1) |
| 1313 | 0x58, 0x10, 0x10, 0x00, // l %r1, 0(%r1) |
| 1314 | 0x07, 0xf1, // br %r1 |
| 1315 | // second part |
| 1316 | 0x0d, 0x10, // basr %r1, %r0 |
| 1317 | 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1) |
| 1318 | 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill) |
| 1319 | 0x00, 0x00, // padding |
| 1320 | 0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_+sym@gotplt (to fill) |
| 1321 | 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill) |
| 1322 | }; |
| 1323 | |
| 1324 | template<int size> |
| 1325 | const unsigned char |
| 1326 | Output_data_plt_s390<size>::plt_entry_32_pic12[plt_entry_size] = |
| 1327 | { |
| 1328 | // first part |
| 1329 | 0x58, 0x10, 0xc0, 0x00, // l %r1, sym@gotplt(%r12) (to fill) |
| 1330 | 0x07, 0xf1, // br %r1 |
| 1331 | 0x00, 0x00, // padding |
| 1332 | 0x00, 0x00, 0x00, 0x00, // padding |
| 1333 | // second part |
| 1334 | 0x0d, 0x10, // basr %r1, %r0 |
| 1335 | 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1) |
| 1336 | 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill) |
| 1337 | 0x00, 0x00, // padding |
| 1338 | 0x00, 0x00, 0x00, 0x00, // padding |
| 1339 | 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill) |
| 1340 | }; |
| 1341 | |
| 1342 | template<int size> |
| 1343 | const unsigned char |
| 1344 | Output_data_plt_s390<size>::plt_entry_32_pic16[plt_entry_size] = |
| 1345 | { |
| 1346 | // first part |
| 1347 | 0xa7, 0x18, 0x00, 0x00, // lhi %r1, sym@gotplt (to fill) |
| 1348 | 0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12) |
| 1349 | 0x07, 0xf1, // br %r1 |
| 1350 | 0x00, 0x00, // padding |
| 1351 | // second part |
| 1352 | 0x0d, 0x10, // basr %r1, %r0 |
| 1353 | 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1) |
| 1354 | 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill) |
| 1355 | 0x00, 0x00, // padding |
| 1356 | 0x00, 0x00, 0x00, 0x00, // padding |
| 1357 | 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill) |
| 1358 | }; |
| 1359 | |
| 1360 | template<int size> |
| 1361 | const unsigned char |
| 1362 | Output_data_plt_s390<size>::plt_entry_32_pic[plt_entry_size] = |
| 1363 | { |
| 1364 | // first part |
| 1365 | 0x0d, 0x10, // basr %r1, %r0 |
| 1366 | 0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1) |
| 1367 | 0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12) |
| 1368 | 0x07, 0xf1, // br %r1 |
| 1369 | // second part |
| 1370 | 0x0d, 0x10, // basr %r1, %r0 |
| 1371 | 0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1) |
| 1372 | 0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill) |
| 1373 | 0x00, 0x00, // padding |
| 1374 | 0x00, 0x00, 0x00, 0x00, // sym@gotplt (to fill) |
| 1375 | 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill) |
| 1376 | }; |
| 1377 | |
| 1378 | template<int size> |
| 1379 | const unsigned char |
| 1380 | Output_data_plt_s390<size>::plt_entry_64[plt_entry_size] = |
| 1381 | { |
| 1382 | // first part |
| 1383 | 0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_+off (to fill) |
| 1384 | 0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, // lg %r1, 0(%r1) |
| 1385 | 0x07, 0xf1, // br %r1 |
| 1386 | // second part |
| 1387 | 0x0d, 0x10, // basr %r1, %r0 |
| 1388 | 0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, // lgf %r1, 12(%r1) |
| 1389 | 0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, // jg first_plt_entry (to fill) |
| 1390 | 0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill) |
| 1391 | }; |
| 1392 | |
| 1393 | template<int size> |
| 1394 | unsigned int |
| 1395 | Output_data_plt_s390<size>::fill_plt_entry( |
| 1396 | unsigned char* pov, |
| 1397 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, |
| 1398 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, |
| 1399 | unsigned int got_offset, |
| 1400 | unsigned int plt_offset, |
| 1401 | unsigned int plt_rel_offset) |
| 1402 | { |
| 1403 | if (size == 64) |
| 1404 | { |
| 1405 | memcpy(pov, plt_entry_64, plt_entry_size); |
| 1406 | S390_relocate_functions<size>::pcrela32dbl(pov + 2, got_address + got_offset, plt_address + plt_offset); |
| 1407 | S390_relocate_functions<size>::pcrela32dbl(pov + 24, plt_address, plt_address + plt_offset + 22); |
| 1408 | } |
| 1409 | else |
| 1410 | { |
| 1411 | if (!parameters->options().output_is_position_independent()) |
| 1412 | { |
| 1413 | memcpy(pov, plt_entry_32_abs, plt_entry_size); |
| 1414 | elfcpp::Swap<32, true>::writeval(pov + 24, got_address + got_offset); |
| 1415 | } |
| 1416 | else |
| 1417 | { |
| 1418 | if (got_offset < 0x1000) |
| 1419 | { |
| 1420 | memcpy(pov, plt_entry_32_pic12, plt_entry_size); |
| 1421 | S390_relocate_functions<size>::rela12(pov + 2, got_offset); |
| 1422 | } |
| 1423 | else if (got_offset < 0x8000) |
| 1424 | { |
| 1425 | memcpy(pov, plt_entry_32_pic16, plt_entry_size); |
| 1426 | S390_relocate_functions<size>::rela16(pov + 2, got_offset); |
| 1427 | } |
| 1428 | else |
| 1429 | { |
| 1430 | memcpy(pov, plt_entry_32_pic, plt_entry_size); |
| 1431 | elfcpp::Swap<32, true>::writeval(pov + 24, got_offset); |
| 1432 | } |
| 1433 | } |
| 1434 | typename elfcpp::Elf_types<size>::Elf_Addr target = plt_address; |
| 1435 | if (plt_offset >= 0x10000) |
| 1436 | { |
| 1437 | // Would overflow pcrela16dbl - aim at the farthest previous jump |
| 1438 | // we can reach. |
| 1439 | if (plt_offset > 0x10000) |
| 1440 | { |
| 1441 | // Use the full range of pcrel16dbl. |
| 1442 | target = plt_address + plt_offset - 0x10000 + 18; |
| 1443 | } |
| 1444 | else |
| 1445 | { |
| 1446 | // if plt_offset is exactly 0x10000, the above would aim at 18th byte |
| 1447 | // of first_plt_entry, which doesn't have the jump back like the others. |
| 1448 | // Aim at the next entry instead. |
| 1449 | target = plt_address + plt_offset - 0xffe0 + 18; |
| 1450 | } |
| 1451 | } |
| 1452 | S390_relocate_functions<size>::pcrela16dbl(pov + 20, target, plt_address + plt_offset + 18); |
| 1453 | } |
| 1454 | elfcpp::Swap<32, true>::writeval(pov + 28, plt_rel_offset); |
| 1455 | if (size == 64) |
| 1456 | return 14; |
| 1457 | else |
| 1458 | return 12; |
| 1459 | } |
| 1460 | |
| 1461 | // The .eh_frame unwind information for the PLT. |
| 1462 | |
| 1463 | template<> |
| 1464 | const unsigned char |
| 1465 | Output_data_plt_s390<32>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
| 1466 | { |
| 1467 | 1, // CIE version. |
| 1468 | 'z', // Augmentation: augmentation size included. |
| 1469 | 'R', // Augmentation: FDE encoding included. |
| 1470 | '\0', // End of augmentation string. |
| 1471 | 1, // Code alignment factor. |
| 1472 | 0x7c, // Data alignment factor. |
| 1473 | 14, // Return address column. |
| 1474 | 1, // Augmentation size. |
| 1475 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. |
| 1476 | | elfcpp::DW_EH_PE_sdata4), |
| 1477 | elfcpp::DW_CFA_def_cfa, 15, 0x60, // DW_CFA_def_cfa: r15 ofs 0x60. |
| 1478 | }; |
| 1479 | |
| 1480 | template<> |
| 1481 | const unsigned char |
| 1482 | Output_data_plt_s390<64>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
| 1483 | { |
| 1484 | 1, // CIE version. |
| 1485 | 'z', // Augmentation: augmentation size included. |
| 1486 | 'R', // Augmentation: FDE encoding included. |
| 1487 | '\0', // End of augmentation string. |
| 1488 | 1, // Code alignment factor. |
| 1489 | 0x78, // Data alignment factor. |
| 1490 | 14, // Return address column. |
| 1491 | 1, // Augmentation size. |
| 1492 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. |
| 1493 | | elfcpp::DW_EH_PE_sdata4), |
| 1494 | elfcpp::DW_CFA_def_cfa, 15, 0xa0, // DW_CFA_def_cfa: r15 ofs 0xa0. |
| 1495 | }; |
| 1496 | |
| 1497 | template<int size> |
| 1498 | const unsigned char |
| 1499 | Output_data_plt_s390<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
| 1500 | { |
| 1501 | 0, 0, 0, 0, // Replaced with offset to .plt. |
| 1502 | 0, 0, 0, 0, // Replaced with size of .plt. |
| 1503 | 0, // Augmentation size. |
| 1504 | elfcpp::DW_CFA_nop, |
| 1505 | elfcpp::DW_CFA_nop, |
| 1506 | elfcpp::DW_CFA_nop |
| 1507 | }; |
| 1508 | |
| 1509 | // Write out the PLT. This uses the hand-coded instructions above, |
| 1510 | // and adjusts them as needed. |
| 1511 | |
| 1512 | template<int size> |
| 1513 | void |
| 1514 | Output_data_plt_s390<size>::do_write(Output_file* of) |
| 1515 | { |
| 1516 | const off_t offset = this->offset(); |
| 1517 | const section_size_type oview_size = |
| 1518 | convert_to_section_size_type(this->data_size()); |
| 1519 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 1520 | |
| 1521 | const off_t got_file_offset = this->got_plt_->offset(); |
| 1522 | gold_assert(parameters->incremental_update() |
| 1523 | || (got_file_offset + this->got_plt_->data_size() |
| 1524 | == this->got_irelative_->offset())); |
| 1525 | const section_size_type got_size = |
| 1526 | convert_to_section_size_type(this->got_plt_->data_size() |
| 1527 | + this->got_irelative_->data_size()); |
| 1528 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
| 1529 | got_size); |
| 1530 | |
| 1531 | unsigned char* pov = oview; |
| 1532 | |
| 1533 | // The base address of the .plt section. |
| 1534 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
| 1535 | // The base address of the PLT portion of the .got section, |
| 1536 | // which is where the GOT pointer will point, and where the |
| 1537 | // three reserved GOT entries are located. |
| 1538 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
| 1539 | = this->got_plt_->address(); |
| 1540 | |
| 1541 | this->fill_first_plt_entry(pov, got_address, plt_address); |
| 1542 | pov += this->get_plt_entry_size(); |
| 1543 | |
| 1544 | unsigned char* got_pov = got_view; |
| 1545 | |
| 1546 | const int rel_size = elfcpp::Elf_sizes<size>::rela_size; |
| 1547 | |
| 1548 | unsigned int plt_offset = this->get_plt_entry_size(); |
| 1549 | unsigned int plt_rel_offset = 0; |
| 1550 | unsigned int got_offset = 3 * size / 8; |
| 1551 | const unsigned int count = this->count_ + this->irelative_count_; |
| 1552 | // The first three entries in the GOT are reserved, and are written |
| 1553 | // by Output_data_got_plt_s390::do_write. |
| 1554 | got_pov += 3 * size / 8; |
| 1555 | |
| 1556 | for (unsigned int plt_index = 0; |
| 1557 | plt_index < count; |
| 1558 | ++plt_index, |
| 1559 | pov += plt_entry_size, |
| 1560 | got_pov += size / 8, |
| 1561 | plt_offset += plt_entry_size, |
| 1562 | plt_rel_offset += rel_size, |
| 1563 | got_offset += size / 8) |
| 1564 | { |
| 1565 | // Set and adjust the PLT entry itself. |
| 1566 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
| 1567 | got_address, plt_address, |
| 1568 | got_offset, plt_offset, |
| 1569 | plt_rel_offset); |
| 1570 | |
| 1571 | // Set the entry in the GOT. |
| 1572 | elfcpp::Swap<size, true>::writeval(got_pov, |
| 1573 | plt_address + plt_offset + lazy_offset); |
| 1574 | } |
| 1575 | |
| 1576 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
| 1577 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); |
| 1578 | |
| 1579 | of->write_output_view(offset, oview_size, oview); |
| 1580 | of->write_output_view(got_file_offset, got_size, got_view); |
| 1581 | } |
| 1582 | |
| 1583 | // Get the GOT section, creating it if necessary. |
| 1584 | |
| 1585 | template<int size> |
| 1586 | Output_data_got<size, true>* |
| 1587 | Target_s390<size>::got_section(Symbol_table* symtab, Layout* layout) |
| 1588 | { |
| 1589 | if (this->got_ == NULL) |
| 1590 | { |
| 1591 | gold_assert(symtab != NULL && layout != NULL); |
| 1592 | |
| 1593 | // When using -z now, we can treat .got as a relro section. |
| 1594 | // Without -z now, it is modified after program startup by lazy |
| 1595 | // PLT relocations. |
| 1596 | bool is_got_relro = parameters->options().now(); |
| 1597 | Output_section_order got_order = (is_got_relro |
| 1598 | ? ORDER_RELRO_LAST |
| 1599 | : ORDER_DATA); |
| 1600 | |
| 1601 | // The old GNU linker creates a .got.plt section. We just |
| 1602 | // create another set of data in the .got section. Note that we |
| 1603 | // always create a PLT if we create a GOT, although the PLT |
| 1604 | // might be empty. |
| 1605 | this->got_plt_ = new Output_data_got_plt_s390<size>(layout); |
| 1606 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 1607 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| 1608 | this->got_plt_, got_order, is_got_relro); |
| 1609 | |
| 1610 | // The first three entries are reserved. |
| 1611 | this->got_plt_->set_current_data_size(3 * size / 8); |
| 1612 | |
| 1613 | // If there are any IRELATIVE relocations, they get GOT entries |
| 1614 | // in .got.plt after the jump slot entries. |
| 1615 | this->got_irelative_ = new Output_data_space(size / 8, "** GOT IRELATIVE PLT"); |
| 1616 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 1617 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| 1618 | this->got_irelative_, |
| 1619 | got_order, is_got_relro); |
| 1620 | |
| 1621 | // Unlike some targets (.e.g x86), S/390 does not use separate .got and |
| 1622 | // .got.plt sections in output. The output .got section contains both |
| 1623 | // PLT and non-PLT GOT entries. |
| 1624 | this->got_ = new Output_data_got<size, true>(); |
| 1625 | |
| 1626 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 1627 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| 1628 | this->got_, got_order, is_got_relro); |
| 1629 | |
| 1630 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the GOT. |
| 1631 | this->global_offset_table_ = |
| 1632 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 1633 | Symbol_table::PREDEFINED, |
| 1634 | this->got_plt_, |
| 1635 | 0, 0, elfcpp::STT_OBJECT, |
| 1636 | elfcpp::STB_LOCAL, |
| 1637 | elfcpp::STV_HIDDEN, 0, |
| 1638 | false, false); |
| 1639 | |
| 1640 | } |
| 1641 | return this->got_; |
| 1642 | } |
| 1643 | |
| 1644 | // Get the dynamic reloc section, creating it if necessary. |
| 1645 | |
| 1646 | template<int size> |
| 1647 | typename Target_s390<size>::Reloc_section* |
| 1648 | Target_s390<size>::rela_dyn_section(Layout* layout) |
| 1649 | { |
| 1650 | if (this->rela_dyn_ == NULL) |
| 1651 | { |
| 1652 | gold_assert(layout != NULL); |
| 1653 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| 1654 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 1655 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
| 1656 | ORDER_DYNAMIC_RELOCS, false); |
| 1657 | } |
| 1658 | return this->rela_dyn_; |
| 1659 | } |
| 1660 | |
| 1661 | // Get the section to use for IRELATIVE relocs, creating it if |
| 1662 | // necessary. These go in .rela.dyn, but only after all other dynamic |
| 1663 | // relocations. They need to follow the other dynamic relocations so |
| 1664 | // that they can refer to global variables initialized by those |
| 1665 | // relocs. |
| 1666 | |
| 1667 | template<int size> |
| 1668 | typename Target_s390<size>::Reloc_section* |
| 1669 | Target_s390<size>::rela_irelative_section(Layout* layout) |
| 1670 | { |
| 1671 | if (this->rela_irelative_ == NULL) |
| 1672 | { |
| 1673 | // Make sure we have already created the dynamic reloc section. |
| 1674 | this->rela_dyn_section(layout); |
| 1675 | this->rela_irelative_ = new Reloc_section(false); |
| 1676 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 1677 | elfcpp::SHF_ALLOC, this->rela_irelative_, |
| 1678 | ORDER_DYNAMIC_RELOCS, false); |
| 1679 | gold_assert(this->rela_dyn_->output_section() |
| 1680 | == this->rela_irelative_->output_section()); |
| 1681 | } |
| 1682 | return this->rela_irelative_; |
| 1683 | } |
| 1684 | |
| 1685 | // Write the first three reserved words of the .got.plt section. |
| 1686 | // The remainder of the section is written while writing the PLT |
| 1687 | // in Output_data_plt_s390::do_write. |
| 1688 | |
| 1689 | template<int size> |
| 1690 | void |
| 1691 | Output_data_got_plt_s390<size>::do_write(Output_file* of) |
| 1692 | { |
| 1693 | // The first entry in the GOT is the address of the .dynamic section |
| 1694 | // aka the PT_DYNAMIC segment. The next two entries are reserved. |
| 1695 | // We saved space for them when we created the section in |
| 1696 | // Target_x86_64::got_section. |
| 1697 | const off_t got_file_offset = this->offset(); |
| 1698 | gold_assert(this->data_size() >= 3 * size / 8); |
| 1699 | unsigned char* const got_view = |
| 1700 | of->get_output_view(got_file_offset, 3 * size / 8); |
| 1701 | Output_section* dynamic = this->layout_->dynamic_section(); |
| 1702 | uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); |
| 1703 | elfcpp::Swap<size, true>::writeval(got_view, dynamic_addr); |
| 1704 | memset(got_view + size / 8, 0, 2 * size / 8); |
| 1705 | of->write_output_view(got_file_offset, 3 * size / 8, got_view); |
| 1706 | } |
| 1707 | |
| 1708 | // Create the PLT section. |
| 1709 | |
| 1710 | template<int size> |
| 1711 | void |
| 1712 | Target_s390<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
| 1713 | { |
| 1714 | if (this->plt_ == NULL) |
| 1715 | { |
| 1716 | // Create the GOT sections first. |
| 1717 | this->got_section(symtab, layout); |
| 1718 | |
| 1719 | // Ensure that .rela.dyn always appears before .rela.plt This is |
| 1720 | // necessary due to how, on 32-bit S/390 and some other targets, |
| 1721 | // .rela.dyn needs to include .rela.plt in it's range. |
| 1722 | this->rela_dyn_section(layout); |
| 1723 | |
| 1724 | this->plt_ = new Output_data_plt_s390<size>(layout, |
| 1725 | this->got_, this->got_plt_, this->got_irelative_); |
| 1726 | |
| 1727 | // Add unwind information if requested. |
| 1728 | if (parameters->options().ld_generated_unwind_info()) |
| 1729 | this->plt_->add_eh_frame(layout); |
| 1730 | |
| 1731 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
| 1732 | (elfcpp::SHF_ALLOC |
| 1733 | | elfcpp::SHF_EXECINSTR), |
| 1734 | this->plt_, ORDER_PLT, false); |
| 1735 | |
| 1736 | // Make the sh_info field of .rela.plt point to .plt. |
| 1737 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); |
| 1738 | rela_plt_os->set_info_section(this->plt_->output_section()); |
| 1739 | } |
| 1740 | } |
| 1741 | |
| 1742 | // Create a PLT entry for a global symbol. |
| 1743 | |
| 1744 | template<int size> |
| 1745 | void |
| 1746 | Target_s390<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
| 1747 | Symbol* gsym) |
| 1748 | { |
| 1749 | if (gsym->has_plt_offset()) |
| 1750 | return; |
| 1751 | |
| 1752 | if (this->plt_ == NULL) |
| 1753 | this->make_plt_section(symtab, layout); |
| 1754 | |
| 1755 | this->plt_->add_entry(symtab, layout, gsym); |
| 1756 | } |
| 1757 | |
| 1758 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
| 1759 | |
| 1760 | template<int size> |
| 1761 | void |
| 1762 | Target_s390<size>::make_local_ifunc_plt_entry( |
| 1763 | Symbol_table* symtab, Layout* layout, |
| 1764 | Sized_relobj_file<size, true>* relobj, |
| 1765 | unsigned int local_sym_index) |
| 1766 | { |
| 1767 | if (relobj->local_has_plt_offset(local_sym_index)) |
| 1768 | return; |
| 1769 | if (this->plt_ == NULL) |
| 1770 | this->make_plt_section(symtab, layout); |
| 1771 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
| 1772 | relobj, |
| 1773 | local_sym_index); |
| 1774 | relobj->set_local_plt_offset(local_sym_index, plt_offset); |
| 1775 | } |
| 1776 | |
| 1777 | // Return the number of entries in the PLT. |
| 1778 | |
| 1779 | template<int size> |
| 1780 | unsigned int |
| 1781 | Target_s390<size>::plt_entry_count() const |
| 1782 | { |
| 1783 | if (this->plt_ == NULL) |
| 1784 | return 0; |
| 1785 | return this->plt_->entry_count(); |
| 1786 | } |
| 1787 | |
| 1788 | // Return the offset of the first non-reserved PLT entry. |
| 1789 | |
| 1790 | template<int size> |
| 1791 | unsigned int |
| 1792 | Target_s390<size>::first_plt_entry_offset() const |
| 1793 | { |
| 1794 | return this->plt_->first_plt_entry_offset(); |
| 1795 | } |
| 1796 | |
| 1797 | // Return the size of each PLT entry. |
| 1798 | |
| 1799 | template<int size> |
| 1800 | unsigned int |
| 1801 | Target_s390<size>::plt_entry_size() const |
| 1802 | { |
| 1803 | return this->plt_->get_plt_entry_size(); |
| 1804 | } |
| 1805 | |
| 1806 | // Create the GOT and PLT sections for an incremental update. |
| 1807 | |
| 1808 | template<int size> |
| 1809 | Output_data_got_base* |
| 1810 | Target_s390<size>::init_got_plt_for_update(Symbol_table* symtab, |
| 1811 | Layout* layout, |
| 1812 | unsigned int got_count, |
| 1813 | unsigned int plt_count) |
| 1814 | { |
| 1815 | gold_assert(this->got_ == NULL); |
| 1816 | |
| 1817 | // Add the three reserved entries. |
| 1818 | this->got_plt_ = new Output_data_got_plt_s390<size>(layout, (plt_count + 3) * size / 8); |
| 1819 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 1820 | (elfcpp::SHF_ALLOC |
| 1821 | | elfcpp::SHF_WRITE), |
| 1822 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
| 1823 | false); |
| 1824 | |
| 1825 | // If there are any IRELATIVE relocations, they get GOT entries in |
| 1826 | // .got.plt after the jump slot entries. |
| 1827 | this->got_irelative_ = new Output_data_space(0, size / 8, "** GOT IRELATIVE PLT"); |
| 1828 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 1829 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 1830 | this->got_irelative_, |
| 1831 | ORDER_NON_RELRO_FIRST, false); |
| 1832 | |
| 1833 | this->got_ = new Output_data_got<size, true>(got_count * size / 8); |
| 1834 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 1835 | (elfcpp::SHF_ALLOC |
| 1836 | | elfcpp::SHF_WRITE), |
| 1837 | this->got_, ORDER_RELRO_LAST, |
| 1838 | true); |
| 1839 | |
| 1840 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
| 1841 | this->global_offset_table_ = |
| 1842 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 1843 | Symbol_table::PREDEFINED, |
| 1844 | this->got_plt_, |
| 1845 | 0, 0, elfcpp::STT_OBJECT, |
| 1846 | elfcpp::STB_LOCAL, |
| 1847 | elfcpp::STV_HIDDEN, 0, |
| 1848 | false, false); |
| 1849 | |
| 1850 | // Create the PLT section. |
| 1851 | this->plt_ = new Output_data_plt_s390<size>(layout, |
| 1852 | this->got_, this->got_plt_, this->got_irelative_, plt_count); |
| 1853 | |
| 1854 | // Add unwind information if requested. |
| 1855 | if (parameters->options().ld_generated_unwind_info()) |
| 1856 | this->plt_->add_eh_frame(layout); |
| 1857 | |
| 1858 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
| 1859 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, |
| 1860 | this->plt_, ORDER_PLT, false); |
| 1861 | |
| 1862 | // Make the sh_info field of .rela.plt point to .plt. |
| 1863 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); |
| 1864 | rela_plt_os->set_info_section(this->plt_->output_section()); |
| 1865 | |
| 1866 | // Create the rela_dyn section. |
| 1867 | this->rela_dyn_section(layout); |
| 1868 | |
| 1869 | return this->got_; |
| 1870 | } |
| 1871 | |
| 1872 | // Reserve a GOT entry for a local symbol, and regenerate any |
| 1873 | // necessary dynamic relocations. |
| 1874 | |
| 1875 | template<int size> |
| 1876 | void |
| 1877 | Target_s390<size>::reserve_local_got_entry( |
| 1878 | unsigned int got_index, |
| 1879 | Sized_relobj<size, true>* obj, |
| 1880 | unsigned int r_sym, |
| 1881 | unsigned int got_type) |
| 1882 | { |
| 1883 | unsigned int got_offset = got_index * size / 8; |
| 1884 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); |
| 1885 | |
| 1886 | this->got_->reserve_local(got_index, obj, r_sym, got_type); |
| 1887 | switch (got_type) |
| 1888 | { |
| 1889 | case GOT_TYPE_STANDARD: |
| 1890 | if (parameters->options().output_is_position_independent()) |
| 1891 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_390_RELATIVE, |
| 1892 | this->got_, got_offset, 0, false); |
| 1893 | break; |
| 1894 | case GOT_TYPE_TLS_OFFSET: |
| 1895 | rela_dyn->add_local(obj, r_sym, elfcpp::R_390_TLS_TPOFF, |
| 1896 | this->got_, got_offset, 0); |
| 1897 | break; |
| 1898 | case GOT_TYPE_TLS_PAIR: |
| 1899 | this->got_->reserve_slot(got_index + 1); |
| 1900 | rela_dyn->add_local(obj, r_sym, elfcpp::R_390_TLS_DTPMOD, |
| 1901 | this->got_, got_offset, 0); |
| 1902 | break; |
| 1903 | default: |
| 1904 | gold_unreachable(); |
| 1905 | } |
| 1906 | } |
| 1907 | |
| 1908 | // Reserve a GOT entry for a global symbol, and regenerate any |
| 1909 | // necessary dynamic relocations. |
| 1910 | |
| 1911 | template<int size> |
| 1912 | void |
| 1913 | Target_s390<size>::reserve_global_got_entry(unsigned int got_index, |
| 1914 | Symbol* gsym, |
| 1915 | unsigned int got_type) |
| 1916 | { |
| 1917 | unsigned int got_offset = got_index * size / 8; |
| 1918 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); |
| 1919 | |
| 1920 | this->got_->reserve_global(got_index, gsym, got_type); |
| 1921 | switch (got_type) |
| 1922 | { |
| 1923 | case GOT_TYPE_STANDARD: |
| 1924 | if (!gsym->final_value_is_known()) |
| 1925 | { |
| 1926 | if (gsym->is_from_dynobj() |
| 1927 | || gsym->is_undefined() |
| 1928 | || gsym->is_preemptible() |
| 1929 | || gsym->type() == elfcpp::STT_GNU_IFUNC) |
| 1930 | rela_dyn->add_global(gsym, elfcpp::R_390_GLOB_DAT, |
| 1931 | this->got_, got_offset, 0); |
| 1932 | else |
| 1933 | rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE, |
| 1934 | this->got_, got_offset, 0, false); |
| 1935 | } |
| 1936 | break; |
| 1937 | case GOT_TYPE_TLS_OFFSET: |
| 1938 | rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_TPOFF, |
| 1939 | this->got_, got_offset, 0, false); |
| 1940 | break; |
| 1941 | case GOT_TYPE_TLS_PAIR: |
| 1942 | this->got_->reserve_slot(got_index + 1); |
| 1943 | rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_DTPMOD, |
| 1944 | this->got_, got_offset, 0, false); |
| 1945 | rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_DTPOFF, |
| 1946 | this->got_, got_offset + size / 8, 0, false); |
| 1947 | break; |
| 1948 | default: |
| 1949 | gold_unreachable(); |
| 1950 | } |
| 1951 | } |
| 1952 | |
| 1953 | // Register an existing PLT entry for a global symbol. |
| 1954 | |
| 1955 | template<int size> |
| 1956 | void |
| 1957 | Target_s390<size>::register_global_plt_entry(Symbol_table* symtab, |
| 1958 | Layout* layout, |
| 1959 | unsigned int plt_index, |
| 1960 | Symbol* gsym) |
| 1961 | { |
| 1962 | gold_assert(this->plt_ != NULL); |
| 1963 | gold_assert(!gsym->has_plt_offset()); |
| 1964 | |
| 1965 | this->plt_->reserve_slot(plt_index); |
| 1966 | |
| 1967 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); |
| 1968 | |
| 1969 | unsigned int got_offset = (plt_index + 3) * size / 8; |
| 1970 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
| 1971 | } |
| 1972 | |
| 1973 | // Force a COPY relocation for a given symbol. |
| 1974 | |
| 1975 | template<int size> |
| 1976 | void |
| 1977 | Target_s390<size>::emit_copy_reloc( |
| 1978 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
| 1979 | { |
| 1980 | this->copy_relocs_.emit_copy_reloc(symtab, |
| 1981 | symtab->get_sized_symbol<size>(sym), |
| 1982 | os, |
| 1983 | offset, |
| 1984 | this->rela_dyn_section(NULL)); |
| 1985 | } |
| 1986 | |
| 1987 | // Create a GOT entry for the TLS module index. |
| 1988 | |
| 1989 | template<int size> |
| 1990 | unsigned int |
| 1991 | Target_s390<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
| 1992 | Sized_relobj_file<size, true>* object) |
| 1993 | { |
| 1994 | if (this->got_mod_index_offset_ == -1U) |
| 1995 | { |
| 1996 | gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| 1997 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| 1998 | Output_data_got<size, true>* got = this->got_section(symtab, layout); |
| 1999 | unsigned int got_offset = got->add_constant(0); |
| 2000 | rela_dyn->add_local(object, 0, elfcpp::R_390_TLS_DTPMOD, got, |
| 2001 | got_offset, 0); |
| 2002 | got->add_constant(0); |
| 2003 | this->got_mod_index_offset_ = got_offset; |
| 2004 | } |
| 2005 | return this->got_mod_index_offset_; |
| 2006 | } |
| 2007 | |
| 2008 | // Optimize the TLS relocation type based on what we know about the |
| 2009 | // symbol. IS_FINAL is true if the final address of this symbol is |
| 2010 | // known at link time. |
| 2011 | |
| 2012 | template<int size> |
| 2013 | tls::Tls_optimization |
| 2014 | Target_s390<size>::optimize_tls_reloc(bool is_final, int r_type) |
| 2015 | { |
| 2016 | // If we are generating a shared library, then we can't do anything |
| 2017 | // in the linker. |
| 2018 | if (parameters->options().shared()) |
| 2019 | return tls::TLSOPT_NONE; |
| 2020 | |
| 2021 | switch (r_type) |
| 2022 | { |
| 2023 | case elfcpp::R_390_TLS_GD32: |
| 2024 | case elfcpp::R_390_TLS_GD64: |
| 2025 | case elfcpp::R_390_TLS_GDCALL: |
| 2026 | // These are General-Dynamic which permits fully general TLS |
| 2027 | // access. Since we know that we are generating an executable, |
| 2028 | // we can convert this to Initial-Exec. If we also know that |
| 2029 | // this is a local symbol, we can further switch to Local-Exec. |
| 2030 | if (is_final) |
| 2031 | return tls::TLSOPT_TO_LE; |
| 2032 | return tls::TLSOPT_TO_IE; |
| 2033 | |
| 2034 | case elfcpp::R_390_TLS_LDM32: |
| 2035 | case elfcpp::R_390_TLS_LDM64: |
| 2036 | case elfcpp::R_390_TLS_LDO32: |
| 2037 | case elfcpp::R_390_TLS_LDO64: |
| 2038 | case elfcpp::R_390_TLS_LDCALL: |
| 2039 | // This is Local-Dynamic, which refers to a local symbol in the |
| 2040 | // dynamic TLS block. Since we know that we generating an |
| 2041 | // executable, we can switch to Local-Exec. |
| 2042 | return tls::TLSOPT_TO_LE; |
| 2043 | |
| 2044 | case elfcpp::R_390_TLS_IE32: |
| 2045 | case elfcpp::R_390_TLS_IE64: |
| 2046 | case elfcpp::R_390_TLS_GOTIE32: |
| 2047 | case elfcpp::R_390_TLS_GOTIE64: |
| 2048 | case elfcpp::R_390_TLS_LOAD: |
| 2049 | // These are Initial-Exec relocs which get the thread offset |
| 2050 | // from the GOT. If we know that we are linking against the |
| 2051 | // local symbol, we can switch to Local-Exec, which links the |
| 2052 | // thread offset into the instruction. |
| 2053 | if (is_final) |
| 2054 | return tls::TLSOPT_TO_LE; |
| 2055 | return tls::TLSOPT_NONE; |
| 2056 | |
| 2057 | case elfcpp::R_390_TLS_GOTIE12: |
| 2058 | case elfcpp::R_390_TLS_IEENT: |
| 2059 | case elfcpp::R_390_TLS_GOTIE20: |
| 2060 | // These are Initial-Exec, but cannot be optimized. |
| 2061 | return tls::TLSOPT_NONE; |
| 2062 | |
| 2063 | case elfcpp::R_390_TLS_LE32: |
| 2064 | case elfcpp::R_390_TLS_LE64: |
| 2065 | // When we already have Local-Exec, there is nothing further we |
| 2066 | // can do. |
| 2067 | return tls::TLSOPT_NONE; |
| 2068 | |
| 2069 | default: |
| 2070 | gold_unreachable(); |
| 2071 | } |
| 2072 | } |
| 2073 | |
| 2074 | // Get the Reference_flags for a particular relocation. |
| 2075 | |
| 2076 | template<int size> |
| 2077 | int |
| 2078 | Target_s390<size>::Scan::get_reference_flags(unsigned int r_type) |
| 2079 | { |
| 2080 | switch (r_type) |
| 2081 | { |
| 2082 | case elfcpp::R_390_NONE: |
| 2083 | case elfcpp::R_390_GNU_VTINHERIT: |
| 2084 | case elfcpp::R_390_GNU_VTENTRY: |
| 2085 | case elfcpp::R_390_GOTPC: |
| 2086 | case elfcpp::R_390_GOTPCDBL: |
| 2087 | // No symbol reference. |
| 2088 | return 0; |
| 2089 | |
| 2090 | case elfcpp::R_390_64: |
| 2091 | case elfcpp::R_390_32: |
| 2092 | case elfcpp::R_390_20: |
| 2093 | case elfcpp::R_390_16: |
| 2094 | case elfcpp::R_390_12: |
| 2095 | case elfcpp::R_390_8: |
| 2096 | return Symbol::ABSOLUTE_REF; |
| 2097 | |
| 2098 | case elfcpp::R_390_PC12DBL: |
| 2099 | case elfcpp::R_390_PC16: |
| 2100 | case elfcpp::R_390_PC16DBL: |
| 2101 | case elfcpp::R_390_PC24DBL: |
| 2102 | case elfcpp::R_390_PC32: |
| 2103 | case elfcpp::R_390_PC32DBL: |
| 2104 | case elfcpp::R_390_PC64: |
| 2105 | case elfcpp::R_390_GOTOFF16: |
| 2106 | case elfcpp::R_390_GOTOFF32: |
| 2107 | case elfcpp::R_390_GOTOFF64: |
| 2108 | return Symbol::RELATIVE_REF; |
| 2109 | |
| 2110 | case elfcpp::R_390_PLT12DBL: |
| 2111 | case elfcpp::R_390_PLT16DBL: |
| 2112 | case elfcpp::R_390_PLT24DBL: |
| 2113 | case elfcpp::R_390_PLT32: |
| 2114 | case elfcpp::R_390_PLT32DBL: |
| 2115 | case elfcpp::R_390_PLT64: |
| 2116 | case elfcpp::R_390_PLTOFF16: |
| 2117 | case elfcpp::R_390_PLTOFF32: |
| 2118 | case elfcpp::R_390_PLTOFF64: |
| 2119 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; |
| 2120 | |
| 2121 | case elfcpp::R_390_GOT12: |
| 2122 | case elfcpp::R_390_GOT16: |
| 2123 | case elfcpp::R_390_GOT20: |
| 2124 | case elfcpp::R_390_GOT32: |
| 2125 | case elfcpp::R_390_GOT64: |
| 2126 | case elfcpp::R_390_GOTENT: |
| 2127 | case elfcpp::R_390_GOTPLT12: |
| 2128 | case elfcpp::R_390_GOTPLT16: |
| 2129 | case elfcpp::R_390_GOTPLT20: |
| 2130 | case elfcpp::R_390_GOTPLT32: |
| 2131 | case elfcpp::R_390_GOTPLT64: |
| 2132 | case elfcpp::R_390_GOTPLTENT: |
| 2133 | // Absolute in GOT. |
| 2134 | return Symbol::ABSOLUTE_REF; |
| 2135 | |
| 2136 | case elfcpp::R_390_TLS_GD32: // Global-dynamic |
| 2137 | case elfcpp::R_390_TLS_GD64: |
| 2138 | case elfcpp::R_390_TLS_GDCALL: |
| 2139 | case elfcpp::R_390_TLS_LDM32: // Local-dynamic |
| 2140 | case elfcpp::R_390_TLS_LDM64: |
| 2141 | case elfcpp::R_390_TLS_LDO32: |
| 2142 | case elfcpp::R_390_TLS_LDO64: |
| 2143 | case elfcpp::R_390_TLS_LDCALL: |
| 2144 | case elfcpp::R_390_TLS_IE32: // Initial-exec |
| 2145 | case elfcpp::R_390_TLS_IE64: |
| 2146 | case elfcpp::R_390_TLS_IEENT: |
| 2147 | case elfcpp::R_390_TLS_GOTIE12: |
| 2148 | case elfcpp::R_390_TLS_GOTIE20: |
| 2149 | case elfcpp::R_390_TLS_GOTIE32: |
| 2150 | case elfcpp::R_390_TLS_GOTIE64: |
| 2151 | case elfcpp::R_390_TLS_LOAD: |
| 2152 | case elfcpp::R_390_TLS_LE32: // Local-exec |
| 2153 | case elfcpp::R_390_TLS_LE64: |
| 2154 | return Symbol::TLS_REF; |
| 2155 | |
| 2156 | case elfcpp::R_390_COPY: |
| 2157 | case elfcpp::R_390_GLOB_DAT: |
| 2158 | case elfcpp::R_390_JMP_SLOT: |
| 2159 | case elfcpp::R_390_RELATIVE: |
| 2160 | case elfcpp::R_390_IRELATIVE: |
| 2161 | case elfcpp::R_390_TLS_TPOFF: |
| 2162 | case elfcpp::R_390_TLS_DTPOFF: |
| 2163 | case elfcpp::R_390_TLS_DTPMOD: |
| 2164 | default: |
| 2165 | // Not expected. We will give an error later. |
| 2166 | return 0; |
| 2167 | } |
| 2168 | } |
| 2169 | |
| 2170 | // Report an unsupported relocation against a local symbol. |
| 2171 | |
| 2172 | template<int size> |
| 2173 | void |
| 2174 | Target_s390<size>::Scan::unsupported_reloc_local( |
| 2175 | Sized_relobj_file<size, true>* object, |
| 2176 | unsigned int r_type) |
| 2177 | { |
| 2178 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 2179 | object->name().c_str(), r_type); |
| 2180 | } |
| 2181 | |
| 2182 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
| 2183 | // dynamic linker does not support it, issue an error. |
| 2184 | |
| 2185 | template<int size> |
| 2186 | void |
| 2187 | Target_s390<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type) |
| 2188 | { |
| 2189 | gold_assert(r_type != elfcpp::R_390_NONE); |
| 2190 | |
| 2191 | if (size == 64) |
| 2192 | { |
| 2193 | switch (r_type) |
| 2194 | { |
| 2195 | // These are the relocation types supported by glibc for s390 64-bit. |
| 2196 | case elfcpp::R_390_RELATIVE: |
| 2197 | case elfcpp::R_390_IRELATIVE: |
| 2198 | case elfcpp::R_390_COPY: |
| 2199 | case elfcpp::R_390_GLOB_DAT: |
| 2200 | case elfcpp::R_390_JMP_SLOT: |
| 2201 | case elfcpp::R_390_TLS_DTPMOD: |
| 2202 | case elfcpp::R_390_TLS_DTPOFF: |
| 2203 | case elfcpp::R_390_TLS_TPOFF: |
| 2204 | case elfcpp::R_390_8: |
| 2205 | case elfcpp::R_390_16: |
| 2206 | case elfcpp::R_390_32: |
| 2207 | case elfcpp::R_390_64: |
| 2208 | case elfcpp::R_390_PC16: |
| 2209 | case elfcpp::R_390_PC16DBL: |
| 2210 | case elfcpp::R_390_PC32: |
| 2211 | case elfcpp::R_390_PC32DBL: |
| 2212 | case elfcpp::R_390_PC64: |
| 2213 | return; |
| 2214 | |
| 2215 | default: |
| 2216 | break; |
| 2217 | } |
| 2218 | } |
| 2219 | else |
| 2220 | { |
| 2221 | switch (r_type) |
| 2222 | { |
| 2223 | // These are the relocation types supported by glibc for s390 32-bit. |
| 2224 | case elfcpp::R_390_RELATIVE: |
| 2225 | case elfcpp::R_390_IRELATIVE: |
| 2226 | case elfcpp::R_390_COPY: |
| 2227 | case elfcpp::R_390_GLOB_DAT: |
| 2228 | case elfcpp::R_390_JMP_SLOT: |
| 2229 | case elfcpp::R_390_TLS_DTPMOD: |
| 2230 | case elfcpp::R_390_TLS_DTPOFF: |
| 2231 | case elfcpp::R_390_TLS_TPOFF: |
| 2232 | case elfcpp::R_390_8: |
| 2233 | case elfcpp::R_390_16: |
| 2234 | case elfcpp::R_390_32: |
| 2235 | case elfcpp::R_390_PC16: |
| 2236 | case elfcpp::R_390_PC16DBL: |
| 2237 | case elfcpp::R_390_PC32: |
| 2238 | case elfcpp::R_390_PC32DBL: |
| 2239 | return; |
| 2240 | |
| 2241 | default: |
| 2242 | break; |
| 2243 | } |
| 2244 | } |
| 2245 | |
| 2246 | // This prevents us from issuing more than one error per reloc |
| 2247 | // section. But we can still wind up issuing more than one |
| 2248 | // error per object file. |
| 2249 | if (this->issued_non_pic_error_) |
| 2250 | return; |
| 2251 | gold_assert(parameters->options().output_is_position_independent()); |
| 2252 | object->error(_("requires unsupported dynamic reloc; " |
| 2253 | "recompile with -fPIC")); |
| 2254 | this->issued_non_pic_error_ = true; |
| 2255 | return; |
| 2256 | } |
| 2257 | |
| 2258 | // Return whether we need to make a PLT entry for a relocation of the |
| 2259 | // given type against a STT_GNU_IFUNC symbol. |
| 2260 | |
| 2261 | template<int size> |
| 2262 | bool |
| 2263 | Target_s390<size>::Scan::reloc_needs_plt_for_ifunc( |
| 2264 | Sized_relobj_file<size, true>* object, |
| 2265 | unsigned int r_type) |
| 2266 | { |
| 2267 | int flags = Scan::get_reference_flags(r_type); |
| 2268 | if (flags & Symbol::TLS_REF) |
| 2269 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), |
| 2270 | object->name().c_str(), r_type); |
| 2271 | return flags != 0; |
| 2272 | } |
| 2273 | |
| 2274 | // Scan a relocation for a local symbol. |
| 2275 | |
| 2276 | template<int size> |
| 2277 | inline void |
| 2278 | Target_s390<size>::Scan::local(Symbol_table* symtab, |
| 2279 | Layout* layout, |
| 2280 | Target_s390<size>* target, |
| 2281 | Sized_relobj_file<size, true>* object, |
| 2282 | unsigned int data_shndx, |
| 2283 | Output_section* output_section, |
| 2284 | const elfcpp::Rela<size, true>& reloc, |
| 2285 | unsigned int r_type, |
| 2286 | const elfcpp::Sym<size, true>& lsym, |
| 2287 | bool is_discarded) |
| 2288 | { |
| 2289 | if (is_discarded) |
| 2290 | return; |
| 2291 | |
| 2292 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
| 2293 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
| 2294 | |
| 2295 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| 2296 | { |
| 2297 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2298 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
| 2299 | } |
| 2300 | |
| 2301 | switch (r_type) |
| 2302 | { |
| 2303 | case elfcpp::R_390_NONE: |
| 2304 | case elfcpp::R_390_GNU_VTINHERIT: |
| 2305 | case elfcpp::R_390_GNU_VTENTRY: |
| 2306 | break; |
| 2307 | |
| 2308 | case elfcpp::R_390_64: |
| 2309 | // If building a shared library (or a position-independent |
| 2310 | // executable), we need to create a dynamic relocation for this |
| 2311 | // location. The relocation applied at link time will apply the |
| 2312 | // link-time value, so we flag the location with an |
| 2313 | // R_390_RELATIVE relocation so the dynamic loader can |
| 2314 | // relocate it easily. |
| 2315 | if (parameters->options().output_is_position_independent() && size == 64) |
| 2316 | { |
| 2317 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2318 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2319 | rela_dyn->add_local_relative(object, r_sym, |
| 2320 | elfcpp::R_390_RELATIVE, |
| 2321 | output_section, data_shndx, |
| 2322 | reloc.get_r_offset(), |
| 2323 | reloc.get_r_addend(), is_ifunc); |
| 2324 | } |
| 2325 | break; |
| 2326 | |
| 2327 | case elfcpp::R_390_32: |
| 2328 | case elfcpp::R_390_20: |
| 2329 | case elfcpp::R_390_16: |
| 2330 | case elfcpp::R_390_12: |
| 2331 | case elfcpp::R_390_8: |
| 2332 | if (parameters->options().output_is_position_independent()) |
| 2333 | { |
| 2334 | if (size == 32 && r_type == elfcpp::R_390_32) |
| 2335 | { |
| 2336 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2337 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2338 | rela_dyn->add_local_relative(object, r_sym, |
| 2339 | elfcpp::R_390_RELATIVE, |
| 2340 | output_section, data_shndx, |
| 2341 | reloc.get_r_offset(), |
| 2342 | reloc.get_r_addend(), is_ifunc); |
| 2343 | break; |
| 2344 | } |
| 2345 | |
| 2346 | check_non_pic(object, r_type); |
| 2347 | |
| 2348 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2349 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2350 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
| 2351 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
| 2352 | data_shndx, reloc.get_r_offset(), |
| 2353 | reloc.get_r_addend()); |
| 2354 | else |
| 2355 | { |
| 2356 | gold_assert(lsym.get_st_value() == 0); |
| 2357 | unsigned int shndx = lsym.get_st_shndx(); |
| 2358 | bool is_ordinary; |
| 2359 | shndx = object->adjust_sym_shndx(r_sym, shndx, |
| 2360 | &is_ordinary); |
| 2361 | if (!is_ordinary) |
| 2362 | object->error(_("section symbol %u has bad shndx %u"), |
| 2363 | r_sym, shndx); |
| 2364 | else |
| 2365 | rela_dyn->add_local_section(object, shndx, |
| 2366 | r_type, output_section, |
| 2367 | data_shndx, reloc.get_r_offset(), |
| 2368 | reloc.get_r_addend()); |
| 2369 | } |
| 2370 | } |
| 2371 | break; |
| 2372 | |
| 2373 | case elfcpp::R_390_PC12DBL: |
| 2374 | case elfcpp::R_390_PC16: |
| 2375 | case elfcpp::R_390_PC16DBL: |
| 2376 | case elfcpp::R_390_PC24DBL: |
| 2377 | case elfcpp::R_390_PC32: |
| 2378 | case elfcpp::R_390_PC32DBL: |
| 2379 | case elfcpp::R_390_PC64: |
| 2380 | break; |
| 2381 | |
| 2382 | case elfcpp::R_390_PLT12DBL: |
| 2383 | case elfcpp::R_390_PLT16DBL: |
| 2384 | case elfcpp::R_390_PLT24DBL: |
| 2385 | case elfcpp::R_390_PLT32: |
| 2386 | case elfcpp::R_390_PLT32DBL: |
| 2387 | case elfcpp::R_390_PLT64: |
| 2388 | // Since we know this is a local symbol, we can handle this as a |
| 2389 | // PC32 reloc. |
| 2390 | break; |
| 2391 | |
| 2392 | case elfcpp::R_390_GOTPC: |
| 2393 | case elfcpp::R_390_GOTPCDBL: |
| 2394 | case elfcpp::R_390_GOTOFF16: |
| 2395 | case elfcpp::R_390_GOTOFF32: |
| 2396 | case elfcpp::R_390_GOTOFF64: |
| 2397 | case elfcpp::R_390_PLTOFF16: |
| 2398 | case elfcpp::R_390_PLTOFF32: |
| 2399 | case elfcpp::R_390_PLTOFF64: |
| 2400 | // We need a GOT section. |
| 2401 | target->got_section(symtab, layout); |
| 2402 | // For PLTOFF*, we'd normally want a PLT section, but since we |
| 2403 | // know this is a local symbol, no PLT is needed. |
| 2404 | break; |
| 2405 | |
| 2406 | case elfcpp::R_390_GOT12: |
| 2407 | case elfcpp::R_390_GOT16: |
| 2408 | case elfcpp::R_390_GOT20: |
| 2409 | case elfcpp::R_390_GOT32: |
| 2410 | case elfcpp::R_390_GOT64: |
| 2411 | case elfcpp::R_390_GOTENT: |
| 2412 | case elfcpp::R_390_GOTPLT12: |
| 2413 | case elfcpp::R_390_GOTPLT16: |
| 2414 | case elfcpp::R_390_GOTPLT20: |
| 2415 | case elfcpp::R_390_GOTPLT32: |
| 2416 | case elfcpp::R_390_GOTPLT64: |
| 2417 | case elfcpp::R_390_GOTPLTENT: |
| 2418 | { |
| 2419 | // The symbol requires a GOT section. |
| 2420 | Output_data_got<size, true>* got = target->got_section(symtab, layout); |
| 2421 | |
| 2422 | // The symbol requires a GOT entry. |
| 2423 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2424 | |
| 2425 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That |
| 2426 | // lets function pointers compare correctly with shared |
| 2427 | // libraries. Otherwise we would need an IRELATIVE reloc. |
| 2428 | bool is_new; |
| 2429 | if (is_ifunc) |
| 2430 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
| 2431 | else |
| 2432 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); |
| 2433 | if (is_new) |
| 2434 | { |
| 2435 | // If we are generating a shared object, we need to add a |
| 2436 | // dynamic relocation for this symbol's GOT entry. |
| 2437 | if (parameters->options().output_is_position_independent()) |
| 2438 | { |
| 2439 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2440 | unsigned int got_offset = |
| 2441 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); |
| 2442 | rela_dyn->add_local_relative(object, r_sym, |
| 2443 | elfcpp::R_390_RELATIVE, |
| 2444 | got, got_offset, 0, is_ifunc); |
| 2445 | } |
| 2446 | } |
| 2447 | // For GOTPLT*, we'd normally want a PLT section, but since |
| 2448 | // we know this is a local symbol, no PLT is needed. |
| 2449 | } |
| 2450 | break; |
| 2451 | |
| 2452 | case elfcpp::R_390_COPY: |
| 2453 | case elfcpp::R_390_GLOB_DAT: |
| 2454 | case elfcpp::R_390_JMP_SLOT: |
| 2455 | case elfcpp::R_390_RELATIVE: |
| 2456 | case elfcpp::R_390_IRELATIVE: |
| 2457 | // These are outstanding tls relocs, which are unexpected when linking |
| 2458 | case elfcpp::R_390_TLS_TPOFF: |
| 2459 | case elfcpp::R_390_TLS_DTPOFF: |
| 2460 | case elfcpp::R_390_TLS_DTPMOD: |
| 2461 | gold_error(_("%s: unexpected reloc %u in object file"), |
| 2462 | object->name().c_str(), r_type); |
| 2463 | break; |
| 2464 | |
| 2465 | // These are initial tls relocs, which are expected when linking |
| 2466 | case elfcpp::R_390_TLS_GD32: // Global-dynamic |
| 2467 | case elfcpp::R_390_TLS_GD64: |
| 2468 | case elfcpp::R_390_TLS_GDCALL: |
| 2469 | case elfcpp::R_390_TLS_LDM32: // Local-dynamic |
| 2470 | case elfcpp::R_390_TLS_LDM64: |
| 2471 | case elfcpp::R_390_TLS_LDO32: |
| 2472 | case elfcpp::R_390_TLS_LDO64: |
| 2473 | case elfcpp::R_390_TLS_LDCALL: |
| 2474 | case elfcpp::R_390_TLS_IE32: // Initial-exec |
| 2475 | case elfcpp::R_390_TLS_IE64: |
| 2476 | case elfcpp::R_390_TLS_IEENT: |
| 2477 | case elfcpp::R_390_TLS_GOTIE12: |
| 2478 | case elfcpp::R_390_TLS_GOTIE20: |
| 2479 | case elfcpp::R_390_TLS_GOTIE32: |
| 2480 | case elfcpp::R_390_TLS_GOTIE64: |
| 2481 | case elfcpp::R_390_TLS_LOAD: |
| 2482 | case elfcpp::R_390_TLS_LE32: // Local-exec |
| 2483 | case elfcpp::R_390_TLS_LE64: |
| 2484 | { |
| 2485 | bool output_is_shared = parameters->options().shared(); |
| 2486 | const tls::Tls_optimization optimized_type |
| 2487 | = Target_s390<size>::optimize_tls_reloc(!output_is_shared, |
| 2488 | r_type); |
| 2489 | switch (r_type) |
| 2490 | { |
| 2491 | case elfcpp::R_390_TLS_GD32: // General-dynamic |
| 2492 | case elfcpp::R_390_TLS_GD64: |
| 2493 | case elfcpp::R_390_TLS_GDCALL: |
| 2494 | if (optimized_type == tls::TLSOPT_NONE) |
| 2495 | { |
| 2496 | // Create a pair of GOT entries for the module index and |
| 2497 | // dtv-relative offset. |
| 2498 | Output_data_got<size, true>* got |
| 2499 | = target->got_section(symtab, layout); |
| 2500 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2501 | unsigned int shndx = lsym.get_st_shndx(); |
| 2502 | bool is_ordinary; |
| 2503 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| 2504 | if (!is_ordinary) |
| 2505 | object->error(_("local symbol %u has bad shndx %u"), |
| 2506 | r_sym, shndx); |
| 2507 | else |
| 2508 | got->add_local_pair_with_rel(object, r_sym, |
| 2509 | shndx, |
| 2510 | GOT_TYPE_TLS_PAIR, |
| 2511 | target->rela_dyn_section(layout), |
| 2512 | elfcpp::R_390_TLS_DTPMOD); |
| 2513 | } |
| 2514 | else if (optimized_type != tls::TLSOPT_TO_LE) |
| 2515 | unsupported_reloc_local(object, r_type); |
| 2516 | break; |
| 2517 | |
| 2518 | case elfcpp::R_390_TLS_LDM32: // Local-dynamic |
| 2519 | case elfcpp::R_390_TLS_LDM64: |
| 2520 | case elfcpp::R_390_TLS_LDCALL: |
| 2521 | if (optimized_type == tls::TLSOPT_NONE) |
| 2522 | { |
| 2523 | // Create a GOT entry for the module index. |
| 2524 | target->got_mod_index_entry(symtab, layout, object); |
| 2525 | } |
| 2526 | else if (optimized_type != tls::TLSOPT_TO_LE) |
| 2527 | unsupported_reloc_local(object, r_type); |
| 2528 | break; |
| 2529 | |
| 2530 | case elfcpp::R_390_TLS_LDO32: |
| 2531 | case elfcpp::R_390_TLS_LDO64: |
| 2532 | break; |
| 2533 | |
| 2534 | case elfcpp::R_390_TLS_IE32: // Initial-exec |
| 2535 | case elfcpp::R_390_TLS_IE64: |
| 2536 | // These two involve an absolute address |
| 2537 | if (parameters->options().shared() |
| 2538 | && optimized_type == tls::TLSOPT_NONE) |
| 2539 | { |
| 2540 | if ((size == 32 && r_type == elfcpp::R_390_TLS_IE32) || |
| 2541 | (size == 64 && r_type == elfcpp::R_390_TLS_IE64)) |
| 2542 | { |
| 2543 | // We need to create a dynamic relocation. |
| 2544 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2545 | unsigned int r_sym = |
| 2546 | elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2547 | rela_dyn->add_local_relative(object, r_sym, |
| 2548 | elfcpp::R_390_RELATIVE, |
| 2549 | output_section, data_shndx, |
| 2550 | reloc.get_r_offset(), |
| 2551 | reloc.get_r_addend(), false); |
| 2552 | } |
| 2553 | else |
| 2554 | { |
| 2555 | unsupported_reloc_local(object, r_type); |
| 2556 | } |
| 2557 | } |
| 2558 | // Fall through. |
| 2559 | case elfcpp::R_390_TLS_IEENT: |
| 2560 | case elfcpp::R_390_TLS_GOTIE12: |
| 2561 | case elfcpp::R_390_TLS_GOTIE20: |
| 2562 | case elfcpp::R_390_TLS_GOTIE32: |
| 2563 | case elfcpp::R_390_TLS_GOTIE64: |
| 2564 | case elfcpp::R_390_TLS_LOAD: |
| 2565 | layout->set_has_static_tls(); |
| 2566 | if (optimized_type == tls::TLSOPT_NONE) |
| 2567 | { |
| 2568 | if (!output_is_shared) |
| 2569 | { |
| 2570 | // We're making an executable, and the symbol is local, but |
| 2571 | // we cannot optimize to LE. Make a const GOT entry instead. |
| 2572 | Output_data_got<size, true>* got |
| 2573 | = target->got_section(symtab, layout); |
| 2574 | unsigned int r_sym |
| 2575 | = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2576 | got->add_local_plt(object, r_sym, GOT_TYPE_TLS_OFFSET); |
| 2577 | } |
| 2578 | else |
| 2579 | { |
| 2580 | // Create a GOT entry for the tp-relative offset. |
| 2581 | Output_data_got<size, true>* got |
| 2582 | = target->got_section(symtab, layout); |
| 2583 | unsigned int r_sym |
| 2584 | = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2585 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, |
| 2586 | target->rela_dyn_section(layout), |
| 2587 | elfcpp::R_390_TLS_TPOFF); |
| 2588 | } |
| 2589 | } |
| 2590 | else if (optimized_type != tls::TLSOPT_TO_LE) |
| 2591 | unsupported_reloc_local(object, r_type); |
| 2592 | break; |
| 2593 | |
| 2594 | case elfcpp::R_390_TLS_LE32: // Local-exec |
| 2595 | case elfcpp::R_390_TLS_LE64: |
| 2596 | layout->set_has_static_tls(); |
| 2597 | if (output_is_shared) |
| 2598 | { |
| 2599 | // We need to create a dynamic relocation. |
| 2600 | if ((size == 32 && r_type == elfcpp::R_390_TLS_LE32) || |
| 2601 | (size == 64 && r_type == elfcpp::R_390_TLS_LE64)) |
| 2602 | { |
| 2603 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2604 | unsigned int r_sym |
| 2605 | = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 2606 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
| 2607 | rela_dyn->add_local(object, r_sym, elfcpp::R_390_TLS_TPOFF, |
| 2608 | output_section, data_shndx, |
| 2609 | reloc.get_r_offset(), |
| 2610 | reloc.get_r_addend()); |
| 2611 | } |
| 2612 | else |
| 2613 | { |
| 2614 | unsupported_reloc_local(object, r_type); |
| 2615 | } |
| 2616 | } |
| 2617 | break; |
| 2618 | |
| 2619 | default: |
| 2620 | gold_unreachable(); |
| 2621 | } |
| 2622 | } |
| 2623 | break; |
| 2624 | |
| 2625 | default: |
| 2626 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 2627 | object->name().c_str(), r_type); |
| 2628 | break; |
| 2629 | } |
| 2630 | } |
| 2631 | |
| 2632 | // Scan a relocation for a global symbol. |
| 2633 | |
| 2634 | template<int size> |
| 2635 | inline void |
| 2636 | Target_s390<size>::Scan::global(Symbol_table* symtab, |
| 2637 | Layout* layout, |
| 2638 | Target_s390<size>* target, |
| 2639 | Sized_relobj_file<size, true>* object, |
| 2640 | unsigned int data_shndx, |
| 2641 | Output_section* output_section, |
| 2642 | const elfcpp::Rela<size, true>& reloc, |
| 2643 | unsigned int r_type, |
| 2644 | Symbol* gsym) |
| 2645 | { |
| 2646 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
| 2647 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 2648 | && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| 2649 | target->make_plt_entry(symtab, layout, gsym); |
| 2650 | |
| 2651 | switch (r_type) |
| 2652 | { |
| 2653 | case elfcpp::R_390_NONE: |
| 2654 | case elfcpp::R_390_GNU_VTINHERIT: |
| 2655 | case elfcpp::R_390_GNU_VTENTRY: |
| 2656 | break; |
| 2657 | |
| 2658 | case elfcpp::R_390_64: |
| 2659 | case elfcpp::R_390_32: |
| 2660 | case elfcpp::R_390_20: |
| 2661 | case elfcpp::R_390_16: |
| 2662 | case elfcpp::R_390_12: |
| 2663 | case elfcpp::R_390_8: |
| 2664 | { |
| 2665 | // Make a PLT entry if necessary. |
| 2666 | if (gsym->needs_plt_entry()) |
| 2667 | { |
| 2668 | target->make_plt_entry(symtab, layout, gsym); |
| 2669 | // Since this is not a PC-relative relocation, we may be |
| 2670 | // taking the address of a function. In that case we need to |
| 2671 | // set the entry in the dynamic symbol table to the address of |
| 2672 | // the PLT entry. |
| 2673 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
| 2674 | gsym->set_needs_dynsym_value(); |
| 2675 | } |
| 2676 | // Make a dynamic relocation if necessary. |
| 2677 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
| 2678 | { |
| 2679 | if (!parameters->options().output_is_position_independent() |
| 2680 | && gsym->may_need_copy_reloc()) |
| 2681 | { |
| 2682 | target->copy_reloc(symtab, layout, object, |
| 2683 | data_shndx, output_section, gsym, reloc); |
| 2684 | } |
| 2685 | else if (((size == 64 && r_type == elfcpp::R_390_64) |
| 2686 | || (size == 32 && r_type == elfcpp::R_390_32)) |
| 2687 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
| 2688 | && gsym->can_use_relative_reloc(false) |
| 2689 | && !gsym->is_from_dynobj() |
| 2690 | && !gsym->is_undefined() |
| 2691 | && !gsym->is_preemptible()) |
| 2692 | { |
| 2693 | // Use an IRELATIVE reloc for a locally defined |
| 2694 | // STT_GNU_IFUNC symbol. This makes a function |
| 2695 | // address in a PIE executable match the address in a |
| 2696 | // shared library that it links against. |
| 2697 | Reloc_section* rela_dyn = |
| 2698 | target->rela_irelative_section(layout); |
| 2699 | unsigned int r_type = elfcpp::R_390_IRELATIVE; |
| 2700 | rela_dyn->add_symbolless_global_addend(gsym, r_type, |
| 2701 | output_section, object, |
| 2702 | data_shndx, |
| 2703 | reloc.get_r_offset(), |
| 2704 | reloc.get_r_addend()); |
| 2705 | } |
| 2706 | else if (((size == 64 && r_type == elfcpp::R_390_64) |
| 2707 | || (size == 32 && r_type == elfcpp::R_390_32)) |
| 2708 | && gsym->can_use_relative_reloc(false)) |
| 2709 | { |
| 2710 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2711 | rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE, |
| 2712 | output_section, object, |
| 2713 | data_shndx, |
| 2714 | reloc.get_r_offset(), |
| 2715 | reloc.get_r_addend(), false); |
| 2716 | } |
| 2717 | else |
| 2718 | { |
| 2719 | check_non_pic(object, r_type); |
| 2720 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2721 | rela_dyn->add_global(gsym, r_type, output_section, object, |
| 2722 | data_shndx, reloc.get_r_offset(), |
| 2723 | reloc.get_r_addend()); |
| 2724 | } |
| 2725 | } |
| 2726 | } |
| 2727 | break; |
| 2728 | |
| 2729 | case elfcpp::R_390_PC12DBL: |
| 2730 | case elfcpp::R_390_PC16: |
| 2731 | case elfcpp::R_390_PC16DBL: |
| 2732 | case elfcpp::R_390_PC24DBL: |
| 2733 | case elfcpp::R_390_PC32: |
| 2734 | case elfcpp::R_390_PC32DBL: |
| 2735 | case elfcpp::R_390_PC64: |
| 2736 | { |
| 2737 | // Make a PLT entry if necessary. |
| 2738 | if (gsym->needs_plt_entry()) |
| 2739 | { |
| 2740 | target->make_plt_entry(symtab, layout, gsym); |
| 2741 | // larl is often used to take address of a function. Aim the |
| 2742 | // symbol at the PLT entry. |
| 2743 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
| 2744 | gsym->set_needs_dynsym_value(); |
| 2745 | } |
| 2746 | // Make a dynamic relocation if necessary. |
| 2747 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
| 2748 | { |
| 2749 | if (parameters->options().output_is_executable() |
| 2750 | && gsym->may_need_copy_reloc()) |
| 2751 | { |
| 2752 | target->copy_reloc(symtab, layout, object, |
| 2753 | data_shndx, output_section, gsym, reloc); |
| 2754 | } |
| 2755 | else |
| 2756 | { |
| 2757 | check_non_pic(object, r_type); |
| 2758 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2759 | rela_dyn->add_global(gsym, r_type, output_section, object, |
| 2760 | data_shndx, reloc.get_r_offset(), |
| 2761 | reloc.get_r_addend()); |
| 2762 | } |
| 2763 | } |
| 2764 | } |
| 2765 | break; |
| 2766 | |
| 2767 | case elfcpp::R_390_PLT12DBL: |
| 2768 | case elfcpp::R_390_PLT16DBL: |
| 2769 | case elfcpp::R_390_PLT24DBL: |
| 2770 | case elfcpp::R_390_PLT32: |
| 2771 | case elfcpp::R_390_PLT32DBL: |
| 2772 | case elfcpp::R_390_PLT64: |
| 2773 | // If the symbol is fully resolved, this is just a PC32 reloc. |
| 2774 | // Otherwise we need a PLT entry. |
| 2775 | if (gsym->final_value_is_known()) |
| 2776 | break; |
| 2777 | // If building a shared library, we can also skip the PLT entry |
| 2778 | // if the symbol is defined in the output file and is protected |
| 2779 | // or hidden. |
| 2780 | if (gsym->is_defined() |
| 2781 | && !gsym->is_from_dynobj() |
| 2782 | && !gsym->is_preemptible()) |
| 2783 | break; |
| 2784 | target->make_plt_entry(symtab, layout, gsym); |
| 2785 | break; |
| 2786 | |
| 2787 | case elfcpp::R_390_GOTPC: |
| 2788 | case elfcpp::R_390_GOTPCDBL: |
| 2789 | case elfcpp::R_390_GOTOFF16: |
| 2790 | case elfcpp::R_390_GOTOFF32: |
| 2791 | case elfcpp::R_390_GOTOFF64: |
| 2792 | case elfcpp::R_390_PLTOFF16: |
| 2793 | case elfcpp::R_390_PLTOFF32: |
| 2794 | case elfcpp::R_390_PLTOFF64: |
| 2795 | // We need a GOT section. |
| 2796 | target->got_section(symtab, layout); |
| 2797 | // For PLTOFF*, we also need a PLT entry (but only if the |
| 2798 | // symbol is not fully resolved). |
| 2799 | if ((r_type == elfcpp::R_390_PLTOFF16 |
| 2800 | || r_type == elfcpp::R_390_PLTOFF32 |
| 2801 | || r_type == elfcpp::R_390_PLTOFF64) |
| 2802 | && !gsym->final_value_is_known()) |
| 2803 | target->make_plt_entry(symtab, layout, gsym); |
| 2804 | break; |
| 2805 | |
| 2806 | case elfcpp::R_390_GOT12: |
| 2807 | case elfcpp::R_390_GOT16: |
| 2808 | case elfcpp::R_390_GOT20: |
| 2809 | case elfcpp::R_390_GOT32: |
| 2810 | case elfcpp::R_390_GOT64: |
| 2811 | case elfcpp::R_390_GOTENT: |
| 2812 | case elfcpp::R_390_GOTPLT12: |
| 2813 | case elfcpp::R_390_GOTPLT16: |
| 2814 | case elfcpp::R_390_GOTPLT20: |
| 2815 | case elfcpp::R_390_GOTPLT32: |
| 2816 | case elfcpp::R_390_GOTPLT64: |
| 2817 | case elfcpp::R_390_GOTPLTENT: |
| 2818 | { |
| 2819 | // The symbol requires a GOT entry. |
| 2820 | Output_data_got<size, true>* got = target->got_section(symtab, layout); |
| 2821 | |
| 2822 | if (gsym->final_value_is_known()) |
| 2823 | { |
| 2824 | // For a STT_GNU_IFUNC symbol we want the PLT address. |
| 2825 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| 2826 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 2827 | else |
| 2828 | got->add_global(gsym, GOT_TYPE_STANDARD); |
| 2829 | } |
| 2830 | else |
| 2831 | { |
| 2832 | // If this symbol is not fully resolved, we need to add a |
| 2833 | // dynamic relocation for it. |
| 2834 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2835 | |
| 2836 | // Use a GLOB_DAT rather than a RELATIVE reloc if: |
| 2837 | // |
| 2838 | // 1) The symbol may be defined in some other module. |
| 2839 | // |
| 2840 | // 2) We are building a shared library and this is a |
| 2841 | // protected symbol; using GLOB_DAT means that the dynamic |
| 2842 | // linker can use the address of the PLT in the main |
| 2843 | // executable when appropriate so that function address |
| 2844 | // comparisons work. |
| 2845 | // |
| 2846 | // 3) This is a STT_GNU_IFUNC symbol in position dependent |
| 2847 | // code, again so that function address comparisons work. |
| 2848 | if (gsym->is_from_dynobj() |
| 2849 | || gsym->is_undefined() |
| 2850 | || gsym->is_preemptible() |
| 2851 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
| 2852 | && parameters->options().shared()) |
| 2853 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 2854 | && parameters->options().output_is_position_independent())) |
| 2855 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
| 2856 | elfcpp::R_390_GLOB_DAT); |
| 2857 | else |
| 2858 | { |
| 2859 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
| 2860 | // offset into the GOT, so that function pointer |
| 2861 | // comparisons work correctly. |
| 2862 | bool is_new; |
| 2863 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) |
| 2864 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); |
| 2865 | else |
| 2866 | { |
| 2867 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 2868 | // Tell the dynamic linker to use the PLT address |
| 2869 | // when resolving relocations. |
| 2870 | if (gsym->is_from_dynobj() |
| 2871 | && !parameters->options().shared()) |
| 2872 | gsym->set_needs_dynsym_value(); |
| 2873 | } |
| 2874 | if (is_new) |
| 2875 | { |
| 2876 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); |
| 2877 | rela_dyn->add_global_relative(gsym, |
| 2878 | elfcpp::R_390_RELATIVE, |
| 2879 | got, got_off, 0, false); |
| 2880 | } |
| 2881 | } |
| 2882 | } |
| 2883 | } |
| 2884 | break; |
| 2885 | |
| 2886 | case elfcpp::R_390_COPY: |
| 2887 | case elfcpp::R_390_GLOB_DAT: |
| 2888 | case elfcpp::R_390_JMP_SLOT: |
| 2889 | case elfcpp::R_390_RELATIVE: |
| 2890 | case elfcpp::R_390_IRELATIVE: |
| 2891 | // These are outstanding tls relocs, which are unexpected when linking |
| 2892 | case elfcpp::R_390_TLS_TPOFF: |
| 2893 | case elfcpp::R_390_TLS_DTPOFF: |
| 2894 | case elfcpp::R_390_TLS_DTPMOD: |
| 2895 | gold_error(_("%s: unexpected reloc %u in object file"), |
| 2896 | object->name().c_str(), r_type); |
| 2897 | break; |
| 2898 | |
| 2899 | // These are initial tls relocs, which are expected for global() |
| 2900 | case elfcpp::R_390_TLS_GD32: // Global-dynamic |
| 2901 | case elfcpp::R_390_TLS_GD64: |
| 2902 | case elfcpp::R_390_TLS_GDCALL: |
| 2903 | case elfcpp::R_390_TLS_LDM32: // Local-dynamic |
| 2904 | case elfcpp::R_390_TLS_LDM64: |
| 2905 | case elfcpp::R_390_TLS_LDO32: |
| 2906 | case elfcpp::R_390_TLS_LDO64: |
| 2907 | case elfcpp::R_390_TLS_LDCALL: |
| 2908 | case elfcpp::R_390_TLS_IE32: // Initial-exec |
| 2909 | case elfcpp::R_390_TLS_IE64: |
| 2910 | case elfcpp::R_390_TLS_IEENT: |
| 2911 | case elfcpp::R_390_TLS_GOTIE12: |
| 2912 | case elfcpp::R_390_TLS_GOTIE20: |
| 2913 | case elfcpp::R_390_TLS_GOTIE32: |
| 2914 | case elfcpp::R_390_TLS_GOTIE64: |
| 2915 | case elfcpp::R_390_TLS_LOAD: |
| 2916 | case elfcpp::R_390_TLS_LE32: // Local-exec |
| 2917 | case elfcpp::R_390_TLS_LE64: |
| 2918 | { |
| 2919 | // For the optimizable Initial-Exec model, we can treat undef symbols |
| 2920 | // as final when building an executable. |
| 2921 | const bool is_final = (gsym->final_value_is_known() || |
| 2922 | ((r_type == elfcpp::R_390_TLS_IE32 || |
| 2923 | r_type == elfcpp::R_390_TLS_IE64 || |
| 2924 | r_type == elfcpp::R_390_TLS_GOTIE32 || |
| 2925 | r_type == elfcpp::R_390_TLS_GOTIE64) && |
| 2926 | gsym->is_undefined() && |
| 2927 | parameters->options().output_is_executable())); |
| 2928 | const tls::Tls_optimization optimized_type |
| 2929 | = Target_s390<size>::optimize_tls_reloc(is_final, r_type); |
| 2930 | switch (r_type) |
| 2931 | { |
| 2932 | case elfcpp::R_390_TLS_GD32: // General-dynamic |
| 2933 | case elfcpp::R_390_TLS_GD64: |
| 2934 | case elfcpp::R_390_TLS_GDCALL: |
| 2935 | if (optimized_type == tls::TLSOPT_NONE) |
| 2936 | { |
| 2937 | // Create a pair of GOT entries for the module index and |
| 2938 | // dtv-relative offset. |
| 2939 | Output_data_got<size, true>* got |
| 2940 | = target->got_section(symtab, layout); |
| 2941 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
| 2942 | target->rela_dyn_section(layout), |
| 2943 | elfcpp::R_390_TLS_DTPMOD, |
| 2944 | elfcpp::R_390_TLS_DTPOFF); |
| 2945 | } |
| 2946 | else if (optimized_type == tls::TLSOPT_TO_IE) |
| 2947 | { |
| 2948 | // Create a GOT entry for the tp-relative offset. |
| 2949 | Output_data_got<size, true>* got |
| 2950 | = target->got_section(symtab, layout); |
| 2951 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
| 2952 | target->rela_dyn_section(layout), |
| 2953 | elfcpp::R_390_TLS_TPOFF); |
| 2954 | } |
| 2955 | else if (optimized_type != tls::TLSOPT_TO_LE) |
| 2956 | unsupported_reloc_global(object, r_type, gsym); |
| 2957 | break; |
| 2958 | |
| 2959 | case elfcpp::R_390_TLS_LDM32: // Local-dynamic |
| 2960 | case elfcpp::R_390_TLS_LDM64: |
| 2961 | case elfcpp::R_390_TLS_LDCALL: |
| 2962 | if (optimized_type == tls::TLSOPT_NONE) |
| 2963 | { |
| 2964 | // Create a GOT entry for the module index. |
| 2965 | target->got_mod_index_entry(symtab, layout, object); |
| 2966 | } |
| 2967 | else if (optimized_type != tls::TLSOPT_TO_LE) |
| 2968 | unsupported_reloc_global(object, r_type, gsym); |
| 2969 | break; |
| 2970 | |
| 2971 | case elfcpp::R_390_TLS_LDO32: |
| 2972 | case elfcpp::R_390_TLS_LDO64: |
| 2973 | break; |
| 2974 | |
| 2975 | case elfcpp::R_390_TLS_IE32: // Initial-exec |
| 2976 | case elfcpp::R_390_TLS_IE64: |
| 2977 | // These two involve an absolute address |
| 2978 | if (parameters->options().shared()) |
| 2979 | { |
| 2980 | if ((size == 32 && r_type == elfcpp::R_390_TLS_IE32) || |
| 2981 | (size == 64 && r_type == elfcpp::R_390_TLS_IE64)) |
| 2982 | { |
| 2983 | // We need to create a dynamic relocation. |
| 2984 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 2985 | rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE, |
| 2986 | output_section, object, |
| 2987 | data_shndx, |
| 2988 | reloc.get_r_offset(), |
| 2989 | reloc.get_r_addend(), false); |
| 2990 | } |
| 2991 | else |
| 2992 | { |
| 2993 | unsupported_reloc_global(object, r_type, gsym); |
| 2994 | } |
| 2995 | } |
| 2996 | // Fall through. |
| 2997 | case elfcpp::R_390_TLS_IEENT: |
| 2998 | case elfcpp::R_390_TLS_GOTIE12: |
| 2999 | case elfcpp::R_390_TLS_GOTIE20: |
| 3000 | case elfcpp::R_390_TLS_GOTIE32: |
| 3001 | case elfcpp::R_390_TLS_GOTIE64: |
| 3002 | case elfcpp::R_390_TLS_LOAD: |
| 3003 | layout->set_has_static_tls(); |
| 3004 | if (optimized_type == tls::TLSOPT_NONE) |
| 3005 | { |
| 3006 | if (is_final && !parameters->options().shared()) |
| 3007 | { |
| 3008 | // We're making an executable, and the symbol is local, but |
| 3009 | // we cannot optimize to LE. Make a const GOT entry instead. |
| 3010 | Output_data_got<size, true>* got |
| 3011 | = target->got_section(symtab, layout); |
| 3012 | got->add_global_plt(gsym, GOT_TYPE_TLS_OFFSET); |
| 3013 | } |
| 3014 | else |
| 3015 | { |
| 3016 | // Create a GOT entry for the tp-relative offset. |
| 3017 | Output_data_got<size, true>* got |
| 3018 | = target->got_section(symtab, layout); |
| 3019 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
| 3020 | target->rela_dyn_section(layout), |
| 3021 | elfcpp::R_390_TLS_TPOFF); |
| 3022 | } |
| 3023 | } |
| 3024 | else if (optimized_type != tls::TLSOPT_TO_LE) |
| 3025 | unsupported_reloc_global(object, r_type, gsym); |
| 3026 | break; |
| 3027 | |
| 3028 | case elfcpp::R_390_TLS_LE32: // Local-exec |
| 3029 | case elfcpp::R_390_TLS_LE64: |
| 3030 | layout->set_has_static_tls(); |
| 3031 | if (parameters->options().shared()) |
| 3032 | { |
| 3033 | // We need to create a dynamic relocation. |
| 3034 | if ((size == 32 && r_type == elfcpp::R_390_TLS_LE32) || |
| 3035 | (size == 64 && r_type == elfcpp::R_390_TLS_LE64)) |
| 3036 | { |
| 3037 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 3038 | rela_dyn->add_global(gsym, elfcpp::R_390_TLS_TPOFF, |
| 3039 | output_section, object, |
| 3040 | data_shndx, reloc.get_r_offset(), |
| 3041 | reloc.get_r_addend()); |
| 3042 | } |
| 3043 | else |
| 3044 | { |
| 3045 | unsupported_reloc_global(object, r_type, gsym); |
| 3046 | } |
| 3047 | } |
| 3048 | break; |
| 3049 | |
| 3050 | default: |
| 3051 | gold_unreachable(); |
| 3052 | } |
| 3053 | } |
| 3054 | break; |
| 3055 | |
| 3056 | default: |
| 3057 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 3058 | object->name().c_str(), r_type, |
| 3059 | gsym->demangled_name().c_str()); |
| 3060 | break; |
| 3061 | } |
| 3062 | } |
| 3063 | |
| 3064 | |
| 3065 | // Report an unsupported relocation against a global symbol. |
| 3066 | |
| 3067 | template<int size> |
| 3068 | void |
| 3069 | Target_s390<size>::Scan::unsupported_reloc_global( |
| 3070 | Sized_relobj_file<size, true>* object, |
| 3071 | unsigned int r_type, |
| 3072 | Symbol* gsym) |
| 3073 | { |
| 3074 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 3075 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| 3076 | } |
| 3077 | |
| 3078 | // Returns true if this relocation type could be that of a function pointer. |
| 3079 | template<int size> |
| 3080 | inline bool |
| 3081 | Target_s390<size>::Scan::possible_function_pointer_reloc(unsigned int r_type) |
| 3082 | { |
| 3083 | switch (r_type) |
| 3084 | { |
| 3085 | case elfcpp::R_390_32: |
| 3086 | case elfcpp::R_390_64: |
| 3087 | case elfcpp::R_390_PC32DBL: // could be used by larl insn |
| 3088 | case elfcpp::R_390_GOT12: |
| 3089 | case elfcpp::R_390_GOT16: |
| 3090 | case elfcpp::R_390_GOT20: |
| 3091 | case elfcpp::R_390_GOT32: |
| 3092 | case elfcpp::R_390_GOT64: |
| 3093 | case elfcpp::R_390_GOTENT: |
| 3094 | case elfcpp::R_390_GOTOFF16: |
| 3095 | case elfcpp::R_390_GOTOFF32: |
| 3096 | case elfcpp::R_390_GOTOFF64: |
| 3097 | return true; |
| 3098 | } |
| 3099 | return false; |
| 3100 | } |
| 3101 | |
| 3102 | // For safe ICF, scan a relocation for a local symbol to check if it |
| 3103 | // corresponds to a function pointer being taken. In that case mark |
| 3104 | // the function whose pointer was taken as not foldable. |
| 3105 | |
| 3106 | template<int size> |
| 3107 | inline bool |
| 3108 | Target_s390<size>::Scan::local_reloc_may_be_function_pointer( |
| 3109 | Symbol_table* , |
| 3110 | Layout* , |
| 3111 | Target_s390<size>* , |
| 3112 | Sized_relobj_file<size, true>* , |
| 3113 | unsigned int , |
| 3114 | Output_section* , |
| 3115 | const elfcpp::Rela<size, true>& , |
| 3116 | unsigned int r_type, |
| 3117 | const elfcpp::Sym<size, true>&) |
| 3118 | { |
| 3119 | // When building a shared library, do not fold any local symbols. |
| 3120 | return (parameters->options().shared() |
| 3121 | || possible_function_pointer_reloc(r_type)); |
| 3122 | } |
| 3123 | |
| 3124 | // For safe ICF, scan a relocation for a global symbol to check if it |
| 3125 | // corresponds to a function pointer being taken. In that case mark |
| 3126 | // the function whose pointer was taken as not foldable. |
| 3127 | |
| 3128 | template<int size> |
| 3129 | inline bool |
| 3130 | Target_s390<size>::Scan::global_reloc_may_be_function_pointer( |
| 3131 | Symbol_table*, |
| 3132 | Layout* , |
| 3133 | Target_s390<size>* , |
| 3134 | Sized_relobj_file<size, true>* , |
| 3135 | unsigned int , |
| 3136 | Output_section* , |
| 3137 | const elfcpp::Rela<size, true>& , |
| 3138 | unsigned int r_type, |
| 3139 | Symbol* gsym) |
| 3140 | { |
| 3141 | // When building a shared library, do not fold symbols whose visibility |
| 3142 | // is hidden, internal or protected. |
| 3143 | return ((parameters->options().shared() |
| 3144 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
| 3145 | || gsym->visibility() == elfcpp::STV_PROTECTED |
| 3146 | || gsym->visibility() == elfcpp::STV_HIDDEN)) |
| 3147 | || possible_function_pointer_reloc(r_type)); |
| 3148 | } |
| 3149 | |
| 3150 | template<int size> |
| 3151 | void |
| 3152 | Target_s390<size>::gc_process_relocs(Symbol_table* symtab, |
| 3153 | Layout* layout, |
| 3154 | Sized_relobj_file<size, true>* object, |
| 3155 | unsigned int data_shndx, |
| 3156 | unsigned int sh_type, |
| 3157 | const unsigned char* prelocs, |
| 3158 | size_t reloc_count, |
| 3159 | Output_section* output_section, |
| 3160 | bool needs_special_offset_handling, |
| 3161 | size_t local_symbol_count, |
| 3162 | const unsigned char* plocal_symbols) |
| 3163 | { |
| 3164 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true> |
| 3165 | Classify_reloc; |
| 3166 | |
| 3167 | if (sh_type == elfcpp::SHT_REL) |
| 3168 | return; |
| 3169 | |
| 3170 | gold::gc_process_relocs<size, true, Target_s390<size>, Scan, Classify_reloc>( |
| 3171 | symtab, |
| 3172 | layout, |
| 3173 | this, |
| 3174 | object, |
| 3175 | data_shndx, |
| 3176 | prelocs, |
| 3177 | reloc_count, |
| 3178 | output_section, |
| 3179 | needs_special_offset_handling, |
| 3180 | local_symbol_count, |
| 3181 | plocal_symbols); |
| 3182 | } |
| 3183 | |
| 3184 | // Perform a relocation. |
| 3185 | |
| 3186 | template<int size> |
| 3187 | inline bool |
| 3188 | Target_s390<size>::Relocate::relocate( |
| 3189 | const Relocate_info<size, true>* relinfo, |
| 3190 | unsigned int, |
| 3191 | Target_s390<size>* target, |
| 3192 | Output_section*, |
| 3193 | size_t relnum, |
| 3194 | const unsigned char* preloc, |
| 3195 | const Sized_symbol<size>* gsym, |
| 3196 | const Symbol_value<size>* psymval, |
| 3197 | unsigned char* view, |
| 3198 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 3199 | section_size_type view_size) |
| 3200 | { |
| 3201 | if (view == NULL) |
| 3202 | return true; |
| 3203 | |
| 3204 | const elfcpp::Rela<size, true> rela(preloc); |
| 3205 | unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info()); |
| 3206 | const Sized_relobj_file<size, true>* object = relinfo->object; |
| 3207 | |
| 3208 | // Pick the value to use for symbols defined in the PLT. |
| 3209 | Symbol_value<size> symval; |
| 3210 | if (gsym != NULL |
| 3211 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
| 3212 | { |
| 3213 | symval.set_output_value(target->plt_address_for_global(gsym)); |
| 3214 | psymval = &symval; |
| 3215 | } |
| 3216 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
| 3217 | { |
| 3218 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 3219 | if (object->local_has_plt_offset(r_sym)) |
| 3220 | { |
| 3221 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
| 3222 | psymval = &symval; |
| 3223 | } |
| 3224 | } |
| 3225 | |
| 3226 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 3227 | |
| 3228 | typename elfcpp::Elf_types<size>::Elf_Addr value = 0; |
| 3229 | |
| 3230 | switch (r_type) |
| 3231 | { |
| 3232 | case elfcpp::R_390_PLT64: |
| 3233 | case elfcpp::R_390_PLT32: |
| 3234 | case elfcpp::R_390_PLT32DBL: |
| 3235 | case elfcpp::R_390_PLT24DBL: |
| 3236 | case elfcpp::R_390_PLT16DBL: |
| 3237 | case elfcpp::R_390_PLT12DBL: |
| 3238 | gold_assert(gsym == NULL |
| 3239 | || gsym->has_plt_offset() |
| 3240 | || gsym->final_value_is_known() |
| 3241 | || (gsym->is_defined() |
| 3242 | && !gsym->is_from_dynobj() |
| 3243 | && !gsym->is_preemptible())); |
| 3244 | // Fall through. |
| 3245 | case elfcpp::R_390_8: |
| 3246 | case elfcpp::R_390_12: |
| 3247 | case elfcpp::R_390_16: |
| 3248 | case elfcpp::R_390_20: |
| 3249 | case elfcpp::R_390_32: |
| 3250 | case elfcpp::R_390_64: |
| 3251 | case elfcpp::R_390_PC16: |
| 3252 | case elfcpp::R_390_PC32: |
| 3253 | case elfcpp::R_390_PC64: |
| 3254 | case elfcpp::R_390_PC32DBL: |
| 3255 | case elfcpp::R_390_PC24DBL: |
| 3256 | case elfcpp::R_390_PC16DBL: |
| 3257 | case elfcpp::R_390_PC12DBL: |
| 3258 | value = psymval->value(object, addend); |
| 3259 | break; |
| 3260 | |
| 3261 | case elfcpp::R_390_GOTPC: |
| 3262 | case elfcpp::R_390_GOTPCDBL: |
| 3263 | gold_assert(gsym != NULL); |
| 3264 | value = target->got_address() + addend; |
| 3265 | break; |
| 3266 | |
| 3267 | case elfcpp::R_390_PLTOFF64: |
| 3268 | case elfcpp::R_390_PLTOFF32: |
| 3269 | case elfcpp::R_390_PLTOFF16: |
| 3270 | gold_assert(gsym == NULL |
| 3271 | || gsym->has_plt_offset() |
| 3272 | || gsym->final_value_is_known()); |
| 3273 | // Fall through. |
| 3274 | case elfcpp::R_390_GOTOFF64: |
| 3275 | case elfcpp::R_390_GOTOFF32: |
| 3276 | case elfcpp::R_390_GOTOFF16: |
| 3277 | value = (psymval->value(object, addend) |
| 3278 | - target->got_address()); |
| 3279 | break; |
| 3280 | |
| 3281 | case elfcpp::R_390_GOT12: |
| 3282 | case elfcpp::R_390_GOT16: |
| 3283 | case elfcpp::R_390_GOT20: |
| 3284 | case elfcpp::R_390_GOT32: |
| 3285 | case elfcpp::R_390_GOT64: |
| 3286 | case elfcpp::R_390_GOTENT: |
| 3287 | case elfcpp::R_390_GOTPLT12: |
| 3288 | case elfcpp::R_390_GOTPLT16: |
| 3289 | case elfcpp::R_390_GOTPLT20: |
| 3290 | case elfcpp::R_390_GOTPLT32: |
| 3291 | case elfcpp::R_390_GOTPLT64: |
| 3292 | case elfcpp::R_390_GOTPLTENT: |
| 3293 | { |
| 3294 | unsigned int got_offset = 0; |
| 3295 | if (gsym != NULL) |
| 3296 | { |
| 3297 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| 3298 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD); |
| 3299 | } |
| 3300 | else |
| 3301 | { |
| 3302 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 3303 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
| 3304 | got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); |
| 3305 | } |
| 3306 | value = got_offset + target->got_main_offset() + addend; |
| 3307 | } |
| 3308 | break; |
| 3309 | |
| 3310 | // These are initial tls relocs, which are expected when linking |
| 3311 | case elfcpp::R_390_TLS_LOAD: |
| 3312 | case elfcpp::R_390_TLS_GDCALL: // Global-dynamic |
| 3313 | case elfcpp::R_390_TLS_GD32: |
| 3314 | case elfcpp::R_390_TLS_GD64: |
| 3315 | case elfcpp::R_390_TLS_LDCALL: // Local-dynamic |
| 3316 | case elfcpp::R_390_TLS_LDM32: |
| 3317 | case elfcpp::R_390_TLS_LDM64: |
| 3318 | case elfcpp::R_390_TLS_LDO32: |
| 3319 | case elfcpp::R_390_TLS_LDO64: |
| 3320 | case elfcpp::R_390_TLS_GOTIE12: // Initial-exec |
| 3321 | case elfcpp::R_390_TLS_GOTIE20: |
| 3322 | case elfcpp::R_390_TLS_GOTIE32: |
| 3323 | case elfcpp::R_390_TLS_GOTIE64: |
| 3324 | case elfcpp::R_390_TLS_IE32: |
| 3325 | case elfcpp::R_390_TLS_IE64: |
| 3326 | case elfcpp::R_390_TLS_IEENT: |
| 3327 | case elfcpp::R_390_TLS_LE32: // Local-exec |
| 3328 | case elfcpp::R_390_TLS_LE64: |
| 3329 | value = this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
| 3330 | view, view_size); |
| 3331 | break; |
| 3332 | |
| 3333 | default: |
| 3334 | break; |
| 3335 | } |
| 3336 | |
| 3337 | typename S390_relocate_functions<size>::Status status |
| 3338 | = S390_relocate_functions<size>::STATUS_OK; |
| 3339 | |
| 3340 | switch (r_type) |
| 3341 | { |
| 3342 | case elfcpp::R_390_NONE: |
| 3343 | case elfcpp::R_390_GNU_VTINHERIT: |
| 3344 | case elfcpp::R_390_GNU_VTENTRY: |
| 3345 | case elfcpp::R_390_TLS_GDCALL: |
| 3346 | case elfcpp::R_390_TLS_LDCALL: |
| 3347 | case elfcpp::R_390_TLS_LOAD: |
| 3348 | break; |
| 3349 | |
| 3350 | case elfcpp::R_390_64: |
| 3351 | case elfcpp::R_390_GOT64: |
| 3352 | case elfcpp::R_390_GOTPLT64: |
| 3353 | case elfcpp::R_390_PLTOFF64: |
| 3354 | case elfcpp::R_390_GOTOFF64: |
| 3355 | case elfcpp::R_390_TLS_GD64: |
| 3356 | case elfcpp::R_390_TLS_LDM64: |
| 3357 | case elfcpp::R_390_TLS_LDO64: |
| 3358 | case elfcpp::R_390_TLS_GOTIE64: |
| 3359 | case elfcpp::R_390_TLS_IE64: |
| 3360 | case elfcpp::R_390_TLS_LE64: |
| 3361 | Relocate_functions<size, true>::rela64(view, value, 0); |
| 3362 | break; |
| 3363 | |
| 3364 | case elfcpp::R_390_32: |
| 3365 | case elfcpp::R_390_GOT32: |
| 3366 | case elfcpp::R_390_GOTPLT32: |
| 3367 | case elfcpp::R_390_PLTOFF32: |
| 3368 | case elfcpp::R_390_GOTOFF32: |
| 3369 | case elfcpp::R_390_TLS_GD32: |
| 3370 | case elfcpp::R_390_TLS_LDM32: |
| 3371 | case elfcpp::R_390_TLS_LDO32: |
| 3372 | case elfcpp::R_390_TLS_GOTIE32: |
| 3373 | case elfcpp::R_390_TLS_IE32: |
| 3374 | case elfcpp::R_390_TLS_LE32: |
| 3375 | Relocate_functions<size, true>::rela32(view, value, 0); |
| 3376 | break; |
| 3377 | |
| 3378 | case elfcpp::R_390_20: |
| 3379 | case elfcpp::R_390_GOT20: |
| 3380 | case elfcpp::R_390_GOTPLT20: |
| 3381 | case elfcpp::R_390_TLS_GOTIE20: |
| 3382 | status = S390_relocate_functions<size>::rela20(view, value); |
| 3383 | break; |
| 3384 | |
| 3385 | case elfcpp::R_390_16: |
| 3386 | case elfcpp::R_390_GOT16: |
| 3387 | case elfcpp::R_390_GOTPLT16: |
| 3388 | case elfcpp::R_390_PLTOFF16: |
| 3389 | case elfcpp::R_390_GOTOFF16: |
| 3390 | status = S390_relocate_functions<size>::rela16(view, value); |
| 3391 | break; |
| 3392 | |
| 3393 | case elfcpp::R_390_12: |
| 3394 | case elfcpp::R_390_GOT12: |
| 3395 | case elfcpp::R_390_GOTPLT12: |
| 3396 | case elfcpp::R_390_TLS_GOTIE12: |
| 3397 | status = S390_relocate_functions<size>::rela12(view, value); |
| 3398 | break; |
| 3399 | |
| 3400 | case elfcpp::R_390_8: |
| 3401 | Relocate_functions<size, true>::rela8(view, value, 0); |
| 3402 | break; |
| 3403 | |
| 3404 | case elfcpp::R_390_PC16: |
| 3405 | Relocate_functions<size, true>::pcrela16(view, value, 0, |
| 3406 | address); |
| 3407 | break; |
| 3408 | |
| 3409 | case elfcpp::R_390_PLT64: |
| 3410 | case elfcpp::R_390_PC64: |
| 3411 | Relocate_functions<size, true>::pcrela64(view, value, 0, address); |
| 3412 | break; |
| 3413 | |
| 3414 | case elfcpp::R_390_PLT32: |
| 3415 | case elfcpp::R_390_PC32: |
| 3416 | case elfcpp::R_390_GOTPC: |
| 3417 | Relocate_functions<size, true>::pcrela32(view, value, 0, address); |
| 3418 | break; |
| 3419 | |
| 3420 | case elfcpp::R_390_PLT32DBL: |
| 3421 | case elfcpp::R_390_PC32DBL: |
| 3422 | case elfcpp::R_390_GOTPCDBL: |
| 3423 | status = S390_relocate_functions<size>::pcrela32dbl(view, value, address); |
| 3424 | break; |
| 3425 | |
| 3426 | case elfcpp::R_390_PLT24DBL: |
| 3427 | case elfcpp::R_390_PC24DBL: |
| 3428 | status = S390_relocate_functions<size>::pcrela24dbl(view, value, address); |
| 3429 | break; |
| 3430 | |
| 3431 | case elfcpp::R_390_PLT16DBL: |
| 3432 | case elfcpp::R_390_PC16DBL: |
| 3433 | status = S390_relocate_functions<size>::pcrela16dbl(view, value, address); |
| 3434 | break; |
| 3435 | |
| 3436 | case elfcpp::R_390_PLT12DBL: |
| 3437 | case elfcpp::R_390_PC12DBL: |
| 3438 | status = S390_relocate_functions<size>::pcrela12dbl(view, value, address); |
| 3439 | break; |
| 3440 | |
| 3441 | case elfcpp::R_390_GOTENT: |
| 3442 | case elfcpp::R_390_GOTPLTENT: |
| 3443 | case elfcpp::R_390_TLS_IEENT: |
| 3444 | value += target->got_address(); |
| 3445 | status = S390_relocate_functions<size>::pcrela32dbl(view, value, address); |
| 3446 | break; |
| 3447 | |
| 3448 | case elfcpp::R_390_COPY: |
| 3449 | case elfcpp::R_390_GLOB_DAT: |
| 3450 | case elfcpp::R_390_JMP_SLOT: |
| 3451 | case elfcpp::R_390_RELATIVE: |
| 3452 | case elfcpp::R_390_IRELATIVE: |
| 3453 | // These are outstanding tls relocs, which are unexpected when linking |
| 3454 | case elfcpp::R_390_TLS_TPOFF: |
| 3455 | case elfcpp::R_390_TLS_DTPMOD: |
| 3456 | case elfcpp::R_390_TLS_DTPOFF: |
| 3457 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3458 | _("unexpected reloc %u in object file"), |
| 3459 | r_type); |
| 3460 | break; |
| 3461 | |
| 3462 | default: |
| 3463 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3464 | _("unsupported reloc %u"), |
| 3465 | r_type); |
| 3466 | break; |
| 3467 | } |
| 3468 | |
| 3469 | if (status != S390_relocate_functions<size>::STATUS_OK) |
| 3470 | { |
| 3471 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3472 | _("relocation overflow")); |
| 3473 | } |
| 3474 | |
| 3475 | return true; |
| 3476 | } |
| 3477 | |
| 3478 | // Perform a TLS relocation. |
| 3479 | |
| 3480 | template<int size> |
| 3481 | inline typename elfcpp::Elf_types<size>::Elf_Addr |
| 3482 | Target_s390<size>::Relocate::relocate_tls( |
| 3483 | const Relocate_info<size, true>* relinfo, |
| 3484 | Target_s390<size>* target, |
| 3485 | size_t relnum, |
| 3486 | const elfcpp::Rela<size, true>& rela, |
| 3487 | unsigned int r_type, |
| 3488 | const Sized_symbol<size>* gsym, |
| 3489 | const Symbol_value<size>* psymval, |
| 3490 | unsigned char* view, |
| 3491 | section_size_type view_size) |
| 3492 | { |
| 3493 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 3494 | |
| 3495 | const Sized_relobj_file<size, true>* object = relinfo->object; |
| 3496 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 3497 | elfcpp::Shdr<size, true> data_shdr(relinfo->data_shdr); |
| 3498 | bool is_allocatable = (data_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0; |
| 3499 | |
| 3500 | typename elfcpp::Elf_types<size>::Elf_Addr value |
| 3501 | = psymval->value(relinfo->object, addend); |
| 3502 | |
| 3503 | const bool is_final = (gsym == NULL |
| 3504 | ? !parameters->options().shared() |
| 3505 | : gsym->final_value_is_known()); |
| 3506 | tls::Tls_optimization optimized_type |
| 3507 | = Target_s390<size>::optimize_tls_reloc(is_final, r_type); |
| 3508 | switch (r_type) |
| 3509 | { |
| 3510 | case elfcpp::R_390_TLS_GDCALL: // Global-dynamic marker |
| 3511 | if (optimized_type == tls::TLSOPT_TO_LE) |
| 3512 | { |
| 3513 | if (tls_segment == NULL) |
| 3514 | { |
| 3515 | gold_assert(parameters->errors()->error_count() > 0 |
| 3516 | || issue_undefined_symbol_error(gsym)); |
| 3517 | return 0; |
| 3518 | } |
| 3519 | this->tls_gd_to_le(relinfo, relnum, rela, view, view_size); |
| 3520 | break; |
| 3521 | } |
| 3522 | else |
| 3523 | { |
| 3524 | if (optimized_type == tls::TLSOPT_TO_IE) |
| 3525 | { |
| 3526 | this->tls_gd_to_ie(relinfo, relnum, rela, view, view_size); |
| 3527 | break; |
| 3528 | } |
| 3529 | else if (optimized_type == tls::TLSOPT_NONE) |
| 3530 | { |
| 3531 | break; |
| 3532 | } |
| 3533 | } |
| 3534 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3535 | _("unsupported reloc %u"), r_type); |
| 3536 | break; |
| 3537 | |
| 3538 | case elfcpp::R_390_TLS_GD32: // Global-dynamic |
| 3539 | case elfcpp::R_390_TLS_GD64: |
| 3540 | if (optimized_type == tls::TLSOPT_TO_LE) |
| 3541 | { |
| 3542 | if (tls_segment == NULL) |
| 3543 | { |
| 3544 | gold_assert(parameters->errors()->error_count() > 0 |
| 3545 | || issue_undefined_symbol_error(gsym)); |
| 3546 | return 0; |
| 3547 | } |
| 3548 | return value - tls_segment->memsz(); |
| 3549 | } |
| 3550 | else |
| 3551 | { |
| 3552 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
| 3553 | ? GOT_TYPE_TLS_OFFSET |
| 3554 | : GOT_TYPE_TLS_PAIR); |
| 3555 | if (gsym != NULL) |
| 3556 | { |
| 3557 | gold_assert(gsym->has_got_offset(got_type)); |
| 3558 | return (gsym->got_offset(got_type) |
| 3559 | + target->got_main_offset() |
| 3560 | + addend); |
| 3561 | } |
| 3562 | else |
| 3563 | { |
| 3564 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 3565 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
| 3566 | return (object->local_got_offset(r_sym, got_type) |
| 3567 | + target->got_main_offset() |
| 3568 | + addend); |
| 3569 | } |
| 3570 | } |
| 3571 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3572 | _("unsupported reloc %u"), r_type); |
| 3573 | break; |
| 3574 | |
| 3575 | case elfcpp::R_390_TLS_LDCALL: // Local-dynamic marker |
| 3576 | // This is a marker relocation. If the sequence is being turned to LE, |
| 3577 | // we modify the instruction, otherwise the instruction is untouched. |
| 3578 | if (optimized_type == tls::TLSOPT_TO_LE) |
| 3579 | { |
| 3580 | if (tls_segment == NULL) |
| 3581 | { |
| 3582 | gold_assert(parameters->errors()->error_count() > 0 |
| 3583 | || issue_undefined_symbol_error(gsym)); |
| 3584 | return 0; |
| 3585 | } |
| 3586 | this->tls_ld_to_le(relinfo, relnum, rela, view, view_size); |
| 3587 | break; |
| 3588 | } |
| 3589 | else if (optimized_type == tls::TLSOPT_NONE) |
| 3590 | { |
| 3591 | break; |
| 3592 | } |
| 3593 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3594 | _("unsupported reloc %u"), r_type); |
| 3595 | break; |
| 3596 | |
| 3597 | case elfcpp::R_390_TLS_LDM32: // Local-dynamic module |
| 3598 | case elfcpp::R_390_TLS_LDM64: |
| 3599 | if (optimized_type == tls::TLSOPT_TO_LE) |
| 3600 | { |
| 3601 | if (tls_segment == NULL) |
| 3602 | { |
| 3603 | gold_assert(parameters->errors()->error_count() > 0 |
| 3604 | || issue_undefined_symbol_error(gsym)); |
| 3605 | return 0; |
| 3606 | } |
| 3607 | // Doesn't matter what we fill it with - it's going to be unused. |
| 3608 | return 0; |
| 3609 | } |
| 3610 | else if (optimized_type == tls::TLSOPT_NONE) |
| 3611 | { |
| 3612 | // Relocate the field with the offset of the GOT entry for |
| 3613 | // the module index. |
| 3614 | return (target->got_mod_index_entry(NULL, NULL, NULL) |
| 3615 | + addend |
| 3616 | + target->got_main_offset()); |
| 3617 | } |
| 3618 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3619 | _("unsupported reloc %u"), r_type); |
| 3620 | break; |
| 3621 | |
| 3622 | case elfcpp::R_390_TLS_LDO32: // Local-dynamic offset |
| 3623 | case elfcpp::R_390_TLS_LDO64: |
| 3624 | // This relocation type is used in debugging information. |
| 3625 | // In that case we need to not optimize the value. If the |
| 3626 | // section is not allocatable, then we assume we should not |
| 3627 | // optimize this reloc. |
| 3628 | if (optimized_type == tls::TLSOPT_TO_LE && is_allocatable) |
| 3629 | { |
| 3630 | if (tls_segment == NULL) |
| 3631 | { |
| 3632 | gold_assert(parameters->errors()->error_count() > 0 |
| 3633 | || issue_undefined_symbol_error(gsym)); |
| 3634 | return 0; |
| 3635 | } |
| 3636 | value -= tls_segment->memsz(); |
| 3637 | } |
| 3638 | return value; |
| 3639 | |
| 3640 | case elfcpp::R_390_TLS_LOAD: // Initial-exec marker |
| 3641 | // This is a marker relocation. If the sequence is being turned to LE, |
| 3642 | // we modify the instruction, otherwise the instruction is untouched. |
| 3643 | if (gsym != NULL |
| 3644 | && gsym->is_undefined() |
| 3645 | && parameters->options().output_is_executable()) |
| 3646 | { |
| 3647 | Target_s390<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
| 3648 | rela, view, |
| 3649 | view_size); |
| 3650 | break; |
| 3651 | } |
| 3652 | else if (optimized_type == tls::TLSOPT_TO_LE) |
| 3653 | { |
| 3654 | if (tls_segment == NULL) |
| 3655 | { |
| 3656 | gold_assert(parameters->errors()->error_count() > 0 |
| 3657 | || issue_undefined_symbol_error(gsym)); |
| 3658 | return 0; |
| 3659 | } |
| 3660 | Target_s390<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
| 3661 | rela, view, |
| 3662 | view_size); |
| 3663 | break; |
| 3664 | } |
| 3665 | else if (optimized_type == tls::TLSOPT_NONE) |
| 3666 | { |
| 3667 | break; |
| 3668 | } |
| 3669 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3670 | _("unsupported reloc type %u"), |
| 3671 | r_type); |
| 3672 | break; |
| 3673 | |
| 3674 | case elfcpp::R_390_TLS_GOTIE12: // Initial-exec, not optimizable |
| 3675 | case elfcpp::R_390_TLS_GOTIE20: |
| 3676 | case elfcpp::R_390_TLS_IEENT: |
| 3677 | case elfcpp::R_390_TLS_GOTIE32: // Initial-exec, optimizable |
| 3678 | case elfcpp::R_390_TLS_GOTIE64: |
| 3679 | case elfcpp::R_390_TLS_IE32: |
| 3680 | case elfcpp::R_390_TLS_IE64: |
| 3681 | if (gsym != NULL |
| 3682 | && gsym->is_undefined() |
| 3683 | && parameters->options().output_is_executable() |
| 3684 | // These three cannot be optimized to LE, no matter what |
| 3685 | && r_type != elfcpp::R_390_TLS_GOTIE12 |
| 3686 | && r_type != elfcpp::R_390_TLS_GOTIE20 |
| 3687 | && r_type != elfcpp::R_390_TLS_IEENT) |
| 3688 | { |
| 3689 | return value; |
| 3690 | } |
| 3691 | else if (optimized_type == tls::TLSOPT_TO_LE) |
| 3692 | { |
| 3693 | if (tls_segment == NULL) |
| 3694 | { |
| 3695 | gold_assert(parameters->errors()->error_count() > 0 |
| 3696 | || issue_undefined_symbol_error(gsym)); |
| 3697 | return 0; |
| 3698 | } |
| 3699 | return value - tls_segment->memsz(); |
| 3700 | } |
| 3701 | else if (optimized_type == tls::TLSOPT_NONE) |
| 3702 | { |
| 3703 | // Relocate the field with the offset of the GOT entry for |
| 3704 | // the tp-relative offset of the symbol. |
| 3705 | unsigned int got_offset; |
| 3706 | if (gsym != NULL) |
| 3707 | { |
| 3708 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
| 3709 | got_offset = gsym->got_offset(GOT_TYPE_TLS_OFFSET); |
| 3710 | } |
| 3711 | else |
| 3712 | { |
| 3713 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 3714 | gold_assert(object->local_has_got_offset(r_sym, |
| 3715 | GOT_TYPE_TLS_OFFSET)); |
| 3716 | got_offset = object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET); |
| 3717 | } |
| 3718 | got_offset += target->got_main_offset(); |
| 3719 | if (r_type == elfcpp::R_390_TLS_IE32 |
| 3720 | || r_type == elfcpp::R_390_TLS_IE64) |
| 3721 | return target->got_address() + got_offset + addend; |
| 3722 | else |
| 3723 | return got_offset + addend; |
| 3724 | } |
| 3725 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3726 | _("unsupported reloc type %u"), |
| 3727 | r_type); |
| 3728 | break; |
| 3729 | |
| 3730 | case elfcpp::R_390_TLS_LE32: // Local-exec |
| 3731 | case elfcpp::R_390_TLS_LE64: |
| 3732 | if (tls_segment == NULL) |
| 3733 | { |
| 3734 | gold_assert(parameters->errors()->error_count() > 0 |
| 3735 | || issue_undefined_symbol_error(gsym)); |
| 3736 | return 0; |
| 3737 | } |
| 3738 | return value - tls_segment->memsz(); |
| 3739 | } |
| 3740 | return 0; |
| 3741 | } |
| 3742 | |
| 3743 | // Do a relocation in which we convert a TLS General-Dynamic to an |
| 3744 | // Initial-Exec. |
| 3745 | |
| 3746 | template<int size> |
| 3747 | inline void |
| 3748 | Target_s390<size>::Relocate::tls_gd_to_ie( |
| 3749 | const Relocate_info<size, true>* relinfo, |
| 3750 | size_t relnum, |
| 3751 | const elfcpp::Rela<size, true>& rela, |
| 3752 | unsigned char* view, |
| 3753 | section_size_type view_size) |
| 3754 | { |
| 3755 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); |
| 3756 | if (view[0] == 0x4d) |
| 3757 | { |
| 3758 | // bas, don't care about details |
| 3759 | // Change to l %r2, 0(%r2, %r12) |
| 3760 | view[0] = 0x58; |
| 3761 | view[1] = 0x22; |
| 3762 | view[2] = 0xc0; |
| 3763 | view[3] = 0x00; |
| 3764 | return; |
| 3765 | } |
| 3766 | else if (view[0] == 0xc0) |
| 3767 | { |
| 3768 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6); |
| 3769 | // brasl %r14, __tls_get_offset@plt |
| 3770 | if (view[1] == 0xe5) |
| 3771 | { |
| 3772 | // Change to l/lg %r2, 0(%r2, %r12) |
| 3773 | // There was a PLT32DBL reloc at the last 4 bytes, overwrite its result. |
| 3774 | if (size == 32) |
| 3775 | { |
| 3776 | // l |
| 3777 | view[0] = 0x58; |
| 3778 | view[1] = 0x22; |
| 3779 | view[2] = 0xc0; |
| 3780 | view[3] = 0x00; |
| 3781 | // nop |
| 3782 | view[4] = 0x07; |
| 3783 | view[5] = 0x07; |
| 3784 | } |
| 3785 | else |
| 3786 | { |
| 3787 | // lg |
| 3788 | view[0] = 0xe3; |
| 3789 | view[1] = 0x22; |
| 3790 | view[2] = 0xc0; |
| 3791 | view[3] = 0; |
| 3792 | view[4] = 0; |
| 3793 | view[5] = 0x04; |
| 3794 | } |
| 3795 | return; |
| 3796 | } |
| 3797 | } |
| 3798 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3799 | _("unsupported op for GD to IE")); |
| 3800 | } |
| 3801 | |
| 3802 | // Do a relocation in which we convert a TLS General-Dynamic to a |
| 3803 | // Local-Exec. |
| 3804 | |
| 3805 | template<int size> |
| 3806 | inline void |
| 3807 | Target_s390<size>::Relocate::tls_gd_to_le( |
| 3808 | const Relocate_info<size, true>* relinfo, |
| 3809 | size_t relnum, |
| 3810 | const elfcpp::Rela<size, true>& rela, |
| 3811 | unsigned char* view, |
| 3812 | section_size_type view_size) |
| 3813 | { |
| 3814 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); |
| 3815 | if (view[0] == 0x0d) |
| 3816 | { |
| 3817 | // basr, change to nop |
| 3818 | view[0] = 0x07; |
| 3819 | view[1] = 0x07; |
| 3820 | } |
| 3821 | else if (view[0] == 0x4d) |
| 3822 | { |
| 3823 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); |
| 3824 | // bas, don't care about details, change to nop |
| 3825 | view[0] = 0x47; |
| 3826 | view[1] = 0; |
| 3827 | view[2] = 0; |
| 3828 | view[3] = 0; |
| 3829 | return; |
| 3830 | } |
| 3831 | else if (view[0] == 0xc0) |
| 3832 | { |
| 3833 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6); |
| 3834 | // brasl %r14, __tls_get_offset@plt |
| 3835 | if (view[1] == 0xe5) |
| 3836 | { |
| 3837 | // Change to nop jump. There was a PLT32DBL reloc at the last |
| 3838 | // 4 bytes, overwrite its result. |
| 3839 | view[1] = 0x04; |
| 3840 | view[2] = 0; |
| 3841 | view[3] = 0; |
| 3842 | view[4] = 0; |
| 3843 | view[5] = 0; |
| 3844 | return; |
| 3845 | } |
| 3846 | } |
| 3847 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3848 | _("unsupported op for GD to LE")); |
| 3849 | } |
| 3850 | |
| 3851 | template<int size> |
| 3852 | inline void |
| 3853 | Target_s390<size>::Relocate::tls_ld_to_le( |
| 3854 | const Relocate_info<size, true>* relinfo, |
| 3855 | size_t relnum, |
| 3856 | const elfcpp::Rela<size, true>& rela, |
| 3857 | unsigned char* view, |
| 3858 | section_size_type view_size) |
| 3859 | { |
| 3860 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); |
| 3861 | |
| 3862 | if (view[0] == 0x0d) |
| 3863 | { |
| 3864 | // basr, change to nop |
| 3865 | view[0] = 0x07; |
| 3866 | view[1] = 0x07; |
| 3867 | } |
| 3868 | else if (view[0] == 0x4d) |
| 3869 | { |
| 3870 | // bas, don't care about details, change to nop |
| 3871 | view[0] = 0x47; |
| 3872 | view[1] = 0; |
| 3873 | view[2] = 0; |
| 3874 | view[3] = 0; |
| 3875 | return; |
| 3876 | } |
| 3877 | else if (view[0] == 0xc0) |
| 3878 | { |
| 3879 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6); |
| 3880 | // brasl %r14, __tls_get_offset@plt |
| 3881 | if (view[1] == 0xe5) |
| 3882 | { |
| 3883 | // Change to nop jump. There was a PLT32DBL reloc at the last |
| 3884 | // 4 bytes, overwrite its result. |
| 3885 | view[1] = 0x04; |
| 3886 | view[2] = 0; |
| 3887 | view[3] = 0; |
| 3888 | view[4] = 0; |
| 3889 | view[5] = 0; |
| 3890 | return; |
| 3891 | } |
| 3892 | } |
| 3893 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3894 | _("unsupported op for LD to LE")); |
| 3895 | } |
| 3896 | |
| 3897 | // Do a relocation in which we convert a TLS Initial-Exec to a |
| 3898 | // Local-Exec. |
| 3899 | |
| 3900 | template<int size> |
| 3901 | inline void |
| 3902 | Target_s390<size>::Relocate::tls_ie_to_le( |
| 3903 | const Relocate_info<size, true>* relinfo, |
| 3904 | size_t relnum, |
| 3905 | const elfcpp::Rela<size, true>& rela, |
| 3906 | unsigned char* view, |
| 3907 | section_size_type view_size) |
| 3908 | { |
| 3909 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); |
| 3910 | |
| 3911 | if (view[0] == 0x58) |
| 3912 | { |
| 3913 | // l %rX, 0(%rY) or l %rX, 0(%rY, %r12) |
| 3914 | if ((view[2] & 0x0f) != 0 || view[3] != 0) |
| 3915 | goto err; |
| 3916 | int rx = view[1] >> 4 & 0xf; |
| 3917 | int ry = view[1] & 0xf; |
| 3918 | int rz = view[2] >> 4 & 0xf; |
| 3919 | if (rz == 0) |
| 3920 | { |
| 3921 | } |
| 3922 | else if (ry == 0) |
| 3923 | { |
| 3924 | ry = rz; |
| 3925 | } |
| 3926 | else if (rz == 12) |
| 3927 | { |
| 3928 | } |
| 3929 | else if (ry == 12) |
| 3930 | { |
| 3931 | ry = rz; |
| 3932 | } |
| 3933 | else |
| 3934 | goto err; |
| 3935 | // to lr %rX, $rY |
| 3936 | view[0] = 0x18; |
| 3937 | view[1] = rx << 4 | ry; |
| 3938 | // and insert a nop |
| 3939 | view[2] = 0x07; |
| 3940 | view[3] = 0x00; |
| 3941 | } |
| 3942 | else if (view[0] == 0xe3) |
| 3943 | { |
| 3944 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6); |
| 3945 | // lg %rX, 0(%rY) or lg %rX, 0(%rY, %r12) |
| 3946 | if ((view[2] & 0x0f) != 0 || |
| 3947 | view[3] != 0 || |
| 3948 | view[4] != 0 || |
| 3949 | view[5] != 0x04) |
| 3950 | goto err; |
| 3951 | int rx = view[1] >> 4 & 0xf; |
| 3952 | int ry = view[1] & 0xf; |
| 3953 | int rz = view[2] >> 4 & 0xf; |
| 3954 | if (rz == 0) |
| 3955 | { |
| 3956 | } |
| 3957 | else if (ry == 0) |
| 3958 | { |
| 3959 | ry = rz; |
| 3960 | } |
| 3961 | else if (rz == 12) |
| 3962 | { |
| 3963 | } |
| 3964 | else if (ry == 12) |
| 3965 | { |
| 3966 | ry = rz; |
| 3967 | } |
| 3968 | else |
| 3969 | goto err; |
| 3970 | // to sllg %rX, $rY, 0 |
| 3971 | view[0] = 0xeb; |
| 3972 | view[1] = rx << 4 | ry; |
| 3973 | view[2] = 0x00; |
| 3974 | view[3] = 0x00; |
| 3975 | view[4] = 0x00; |
| 3976 | view[5] = 0x0d; |
| 3977 | } |
| 3978 | else |
| 3979 | { |
| 3980 | err: |
| 3981 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 3982 | _("unsupported op for IE to LE")); |
| 3983 | } |
| 3984 | } |
| 3985 | |
| 3986 | // Scan relocations for a section. |
| 3987 | |
| 3988 | template<int size> |
| 3989 | void |
| 3990 | Target_s390<size>::scan_relocs(Symbol_table* symtab, |
| 3991 | Layout* layout, |
| 3992 | Sized_relobj_file<size, true>* object, |
| 3993 | unsigned int data_shndx, |
| 3994 | unsigned int sh_type, |
| 3995 | const unsigned char* prelocs, |
| 3996 | size_t reloc_count, |
| 3997 | Output_section* output_section, |
| 3998 | bool needs_special_offset_handling, |
| 3999 | size_t local_symbol_count, |
| 4000 | const unsigned char* plocal_symbols) |
| 4001 | { |
| 4002 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true> |
| 4003 | Classify_reloc; |
| 4004 | |
| 4005 | if (sh_type == elfcpp::SHT_REL) |
| 4006 | { |
| 4007 | gold_error(_("%s: unsupported REL reloc section"), |
| 4008 | object->name().c_str()); |
| 4009 | return; |
| 4010 | } |
| 4011 | |
| 4012 | gold::scan_relocs<size, true, Target_s390<size>, Scan, Classify_reloc>( |
| 4013 | symtab, |
| 4014 | layout, |
| 4015 | this, |
| 4016 | object, |
| 4017 | data_shndx, |
| 4018 | prelocs, |
| 4019 | reloc_count, |
| 4020 | output_section, |
| 4021 | needs_special_offset_handling, |
| 4022 | local_symbol_count, |
| 4023 | plocal_symbols); |
| 4024 | } |
| 4025 | |
| 4026 | // Finalize the sections. |
| 4027 | |
| 4028 | template<int size> |
| 4029 | void |
| 4030 | Target_s390<size>::do_finalize_sections( |
| 4031 | Layout* layout, |
| 4032 | const Input_objects*, |
| 4033 | Symbol_table* symtab) |
| 4034 | { |
| 4035 | const Reloc_section* rel_plt = (this->plt_ == NULL |
| 4036 | ? NULL |
| 4037 | : this->plt_->rela_plt()); |
| 4038 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
| 4039 | this->rela_dyn_, true, size == 32); |
| 4040 | |
| 4041 | this->layout_ = layout; |
| 4042 | |
| 4043 | // Emit any relocs we saved in an attempt to avoid generating COPY |
| 4044 | // relocs. |
| 4045 | if (this->copy_relocs_.any_saved_relocs()) |
| 4046 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); |
| 4047 | |
| 4048 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of |
| 4049 | // the .got section. |
| 4050 | Symbol* sym = this->global_offset_table_; |
| 4051 | if (sym != NULL) |
| 4052 | { |
| 4053 | uint64_t data_size = this->got_->current_data_size(); |
| 4054 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
| 4055 | } |
| 4056 | |
| 4057 | if (parameters->doing_static_link() |
| 4058 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) |
| 4059 | { |
| 4060 | // If linking statically, make sure that the __rela_iplt symbols |
| 4061 | // were defined if necessary, even if we didn't create a PLT. |
| 4062 | static const Define_symbol_in_segment syms[] = |
| 4063 | { |
| 4064 | { |
| 4065 | "__rela_iplt_start", // name |
| 4066 | elfcpp::PT_LOAD, // segment_type |
| 4067 | elfcpp::PF_W, // segment_flags_set |
| 4068 | elfcpp::PF(0), // segment_flags_clear |
| 4069 | 0, // value |
| 4070 | 0, // size |
| 4071 | elfcpp::STT_NOTYPE, // type |
| 4072 | elfcpp::STB_GLOBAL, // binding |
| 4073 | elfcpp::STV_HIDDEN, // visibility |
| 4074 | 0, // nonvis |
| 4075 | Symbol::SEGMENT_START, // offset_from_base |
| 4076 | true // only_if_ref |
| 4077 | }, |
| 4078 | { |
| 4079 | "__rela_iplt_end", // name |
| 4080 | elfcpp::PT_LOAD, // segment_type |
| 4081 | elfcpp::PF_W, // segment_flags_set |
| 4082 | elfcpp::PF(0), // segment_flags_clear |
| 4083 | 0, // value |
| 4084 | 0, // size |
| 4085 | elfcpp::STT_NOTYPE, // type |
| 4086 | elfcpp::STB_GLOBAL, // binding |
| 4087 | elfcpp::STV_HIDDEN, // visibility |
| 4088 | 0, // nonvis |
| 4089 | Symbol::SEGMENT_START, // offset_from_base |
| 4090 | true // only_if_ref |
| 4091 | } |
| 4092 | }; |
| 4093 | |
| 4094 | symtab->define_symbols(layout, 2, syms, |
| 4095 | layout->script_options()->saw_sections_clause()); |
| 4096 | } |
| 4097 | } |
| 4098 | |
| 4099 | // Scan the relocs during a relocatable link. |
| 4100 | |
| 4101 | template<int size> |
| 4102 | void |
| 4103 | Target_s390<size>::scan_relocatable_relocs( |
| 4104 | Symbol_table* symtab, |
| 4105 | Layout* layout, |
| 4106 | Sized_relobj_file<size, true>* object, |
| 4107 | unsigned int data_shndx, |
| 4108 | unsigned int sh_type, |
| 4109 | const unsigned char* prelocs, |
| 4110 | size_t reloc_count, |
| 4111 | Output_section* output_section, |
| 4112 | bool needs_special_offset_handling, |
| 4113 | size_t local_symbol_count, |
| 4114 | const unsigned char* plocal_symbols, |
| 4115 | Relocatable_relocs* rr) |
| 4116 | { |
| 4117 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true> |
| 4118 | Classify_reloc; |
| 4119 | typedef gold::Default_scan_relocatable_relocs<Classify_reloc> |
| 4120 | Scan_relocatable_relocs; |
| 4121 | |
| 4122 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 4123 | |
| 4124 | gold::scan_relocatable_relocs<size, true, Scan_relocatable_relocs>( |
| 4125 | symtab, |
| 4126 | layout, |
| 4127 | object, |
| 4128 | data_shndx, |
| 4129 | prelocs, |
| 4130 | reloc_count, |
| 4131 | output_section, |
| 4132 | needs_special_offset_handling, |
| 4133 | local_symbol_count, |
| 4134 | plocal_symbols, |
| 4135 | rr); |
| 4136 | } |
| 4137 | |
| 4138 | // Scan the relocs for --emit-relocs. |
| 4139 | |
| 4140 | template<int size> |
| 4141 | void |
| 4142 | Target_s390<size>::emit_relocs_scan( |
| 4143 | Symbol_table* symtab, |
| 4144 | Layout* layout, |
| 4145 | Sized_relobj_file<size, true>* object, |
| 4146 | unsigned int data_shndx, |
| 4147 | unsigned int sh_type, |
| 4148 | const unsigned char* prelocs, |
| 4149 | size_t reloc_count, |
| 4150 | Output_section* output_section, |
| 4151 | bool needs_special_offset_handling, |
| 4152 | size_t local_symbol_count, |
| 4153 | const unsigned char* plocal_syms, |
| 4154 | Relocatable_relocs* rr) |
| 4155 | { |
| 4156 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true> |
| 4157 | Classify_reloc; |
| 4158 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> |
| 4159 | Emit_relocs_strategy; |
| 4160 | |
| 4161 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 4162 | |
| 4163 | gold::scan_relocatable_relocs<size, true, Emit_relocs_strategy>( |
| 4164 | symtab, |
| 4165 | layout, |
| 4166 | object, |
| 4167 | data_shndx, |
| 4168 | prelocs, |
| 4169 | reloc_count, |
| 4170 | output_section, |
| 4171 | needs_special_offset_handling, |
| 4172 | local_symbol_count, |
| 4173 | plocal_syms, |
| 4174 | rr); |
| 4175 | } |
| 4176 | |
| 4177 | // Relocate a section during a relocatable link. |
| 4178 | |
| 4179 | template<int size> |
| 4180 | void |
| 4181 | Target_s390<size>::relocate_relocs( |
| 4182 | const Relocate_info<size, true>* relinfo, |
| 4183 | unsigned int sh_type, |
| 4184 | const unsigned char* prelocs, |
| 4185 | size_t reloc_count, |
| 4186 | Output_section* output_section, |
| 4187 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 4188 | unsigned char* view, |
| 4189 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 4190 | section_size_type view_size, |
| 4191 | unsigned char* reloc_view, |
| 4192 | section_size_type reloc_view_size) |
| 4193 | { |
| 4194 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true> |
| 4195 | Classify_reloc; |
| 4196 | |
| 4197 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 4198 | |
| 4199 | gold::relocate_relocs<size, true, Classify_reloc>( |
| 4200 | relinfo, |
| 4201 | prelocs, |
| 4202 | reloc_count, |
| 4203 | output_section, |
| 4204 | offset_in_output_section, |
| 4205 | view, |
| 4206 | view_address, |
| 4207 | view_size, |
| 4208 | reloc_view, |
| 4209 | reloc_view_size); |
| 4210 | } |
| 4211 | |
| 4212 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 4213 | // for a local tls symbol specified by OBJECT, SYMNDX. |
| 4214 | template<int size> |
| 4215 | int64_t |
| 4216 | Target_s390<size>::do_tls_offset_for_local( |
| 4217 | const Relobj*, |
| 4218 | unsigned int, |
| 4219 | unsigned int) const |
| 4220 | { |
| 4221 | // The only way we can get called is when IEENT/GOTIE12/GOTIE20 |
| 4222 | // couldn't be optimised to LE. |
| 4223 | Output_segment* tls_segment = layout_->tls_segment(); |
| 4224 | return -tls_segment->memsz(); |
| 4225 | } |
| 4226 | |
| 4227 | // Return the offset to use for the GOT_INDX'th got entry which is |
| 4228 | // for global tls symbol GSYM. |
| 4229 | template<int size> |
| 4230 | int64_t |
| 4231 | Target_s390<size>::do_tls_offset_for_global( |
| 4232 | Symbol*, |
| 4233 | unsigned int) const |
| 4234 | { |
| 4235 | Output_segment* tls_segment = layout_->tls_segment(); |
| 4236 | return -tls_segment->memsz(); |
| 4237 | } |
| 4238 | |
| 4239 | // Return the value to use for a dynamic which requires special |
| 4240 | // treatment. This is how we support equality comparisons of function |
| 4241 | // pointers across shared library boundaries, as described in the |
| 4242 | // processor specific ABI supplement. |
| 4243 | |
| 4244 | template<int size> |
| 4245 | uint64_t |
| 4246 | Target_s390<size>::do_dynsym_value(const Symbol* gsym) const |
| 4247 | { |
| 4248 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| 4249 | return this->plt_address_for_global(gsym); |
| 4250 | } |
| 4251 | |
| 4252 | // Return a string used to fill a code section with nops to take up |
| 4253 | // the specified length. |
| 4254 | |
| 4255 | template<int size> |
| 4256 | std::string |
| 4257 | Target_s390<size>::do_code_fill(section_size_type length) const |
| 4258 | { |
| 4259 | if (length & 1) |
| 4260 | gold_warning(_("S/390 code fill of odd length requested")); |
| 4261 | return std::string(length, static_cast<char>(0x07)); |
| 4262 | } |
| 4263 | |
| 4264 | // Return whether SYM should be treated as a call to a non-split |
| 4265 | // function. We don't want that to be true of a larl instruction |
| 4266 | // that merely loads its address. |
| 4267 | |
| 4268 | template<int size> |
| 4269 | bool |
| 4270 | Target_s390<size>::do_is_call_to_non_split(const Symbol* sym, |
| 4271 | const unsigned char* preloc, |
| 4272 | const unsigned char* view, |
| 4273 | section_size_type view_size) const |
| 4274 | { |
| 4275 | if (sym->type() != elfcpp::STT_FUNC) |
| 4276 | return false; |
| 4277 | typename Reloc_types<elfcpp::SHT_RELA, size, true>::Reloc reloc(preloc); |
| 4278 | typename elfcpp::Elf_types<size>::Elf_WXword r_info |
| 4279 | = reloc.get_r_info(); |
| 4280 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 4281 | section_offset_type offset = reloc.get_r_offset(); |
| 4282 | switch (r_type) |
| 4283 | { |
| 4284 | // PLT refs always involve calling the function. |
| 4285 | case elfcpp::R_390_PLT12DBL: |
| 4286 | case elfcpp::R_390_PLT16DBL: |
| 4287 | case elfcpp::R_390_PLT24DBL: |
| 4288 | case elfcpp::R_390_PLT32: |
| 4289 | case elfcpp::R_390_PLT32DBL: |
| 4290 | case elfcpp::R_390_PLT64: |
| 4291 | case elfcpp::R_390_PLTOFF16: |
| 4292 | case elfcpp::R_390_PLTOFF32: |
| 4293 | case elfcpp::R_390_PLTOFF64: |
| 4294 | // Could be used for calls for -msmall-exec. |
| 4295 | case elfcpp::R_390_PC16DBL: |
| 4296 | return true; |
| 4297 | |
| 4298 | // Tricky case. When used in a brasl, jg, and other branch instructions, |
| 4299 | // it's a call or a sibcall. However, when used in larl, it only loads |
| 4300 | // the function's address - not a call. |
| 4301 | case elfcpp::R_390_PC32DBL: |
| 4302 | { |
| 4303 | if (offset < 2 |
| 4304 | || offset + 4 > static_cast<section_offset_type>(view_size)) |
| 4305 | { |
| 4306 | // Should not happen. |
| 4307 | gold_error(_("instruction with PC32DBL not wholly within section")); |
| 4308 | return false; |
| 4309 | } |
| 4310 | |
| 4311 | uint8_t op0 = view[offset-2]; |
| 4312 | uint8_t op1 = view[offset-1] & 0xf; |
| 4313 | |
| 4314 | // LARL |
| 4315 | if (op0 == 0xc0 && op1 == 0) |
| 4316 | return false; |
| 4317 | |
| 4318 | // Otherwise, it's either a call instruction, a branch instruction |
| 4319 | // (used as a sibcall), or a data manipulation instruction (which |
| 4320 | // has no business being used on a function, and can be ignored). |
| 4321 | return true; |
| 4322 | } |
| 4323 | |
| 4324 | // Otherwise, it's probably not a call. |
| 4325 | default: |
| 4326 | return false; |
| 4327 | } |
| 4328 | } |
| 4329 | |
| 4330 | // Code sequences to match below. |
| 4331 | |
| 4332 | template<int size> |
| 4333 | const unsigned char |
| 4334 | Target_s390<size>::ss_code_bras_8[] = { |
| 4335 | 0xa7, 0x15, 0x00, 0x06, // bras %r1, .+0xc |
| 4336 | }; |
| 4337 | |
| 4338 | template<int size> |
| 4339 | const unsigned char |
| 4340 | Target_s390<size>::ss_code_l_basr[] = { |
| 4341 | 0x58, 0xe0, 0x10, 0x00, // l %r14, 0(%r1) |
| 4342 | 0x58, 0x10, 0x10, 0x04, // l %r1, 4(%r1) |
| 4343 | 0x0d, 0xee, // basr %r14, %r14 |
| 4344 | }; |
| 4345 | |
| 4346 | template<int size> |
| 4347 | const unsigned char |
| 4348 | Target_s390<size>::ss_code_a_basr[] = { |
| 4349 | 0x18, 0xe1, // lr %r14, %r1 |
| 4350 | 0x5a, 0xe0, 0x10, 0x00, // a %r14, 0(%r1) |
| 4351 | 0x5a, 0x10, 0x10, 0x04, // a %r1, 4(%r1) |
| 4352 | 0x0d, 0xee, // basr %r14, %r14 |
| 4353 | }; |
| 4354 | |
| 4355 | template<int size> |
| 4356 | const unsigned char |
| 4357 | Target_s390<size>::ss_code_larl[] = { |
| 4358 | 0xc0, 0x10, // larl %r1, ... |
| 4359 | }; |
| 4360 | |
| 4361 | template<int size> |
| 4362 | const unsigned char |
| 4363 | Target_s390<size>::ss_code_brasl[] = { |
| 4364 | 0xc0, 0xe5, // brasl %r14, ... |
| 4365 | }; |
| 4366 | |
| 4367 | template<int size> |
| 4368 | const unsigned char |
| 4369 | Target_s390<size>::ss_code_jg[] = { |
| 4370 | 0xc0, 0xf4, // jg ... |
| 4371 | }; |
| 4372 | |
| 4373 | template<int size> |
| 4374 | const unsigned char |
| 4375 | Target_s390<size>::ss_code_jgl[] = { |
| 4376 | 0xc0, 0x44, // jgl ... |
| 4377 | }; |
| 4378 | |
| 4379 | template<> |
| 4380 | bool |
| 4381 | Target_s390<32>::ss_match_st_r14(unsigned char* view, |
| 4382 | section_size_type view_size, |
| 4383 | section_offset_type *offset) const |
| 4384 | { |
| 4385 | static const unsigned char ss_code_st_r14[] = { |
| 4386 | 0x50, 0xe0, 0xf0, 0x04, // st %r14, 4(%r15) |
| 4387 | }; |
| 4388 | if (!this->match_view_u(view, view_size, *offset, ss_code_st_r14, |
| 4389 | sizeof ss_code_st_r14)) |
| 4390 | return false; |
| 4391 | *offset += sizeof ss_code_st_r14; |
| 4392 | return true; |
| 4393 | } |
| 4394 | |
| 4395 | template<> |
| 4396 | bool |
| 4397 | Target_s390<64>::ss_match_st_r14(unsigned char* view, |
| 4398 | section_size_type view_size, |
| 4399 | section_offset_type *offset) const |
| 4400 | { |
| 4401 | static const unsigned char ss_code_st_r14[] = { |
| 4402 | 0xe3, 0xe0, 0xf0, 0x08, 0x00, 0x24 // stg %r14, 8(%r15) |
| 4403 | }; |
| 4404 | if (!this->match_view_u(view, view_size, *offset, ss_code_st_r14, |
| 4405 | sizeof ss_code_st_r14)) |
| 4406 | return false; |
| 4407 | *offset += sizeof ss_code_st_r14; |
| 4408 | return true; |
| 4409 | } |
| 4410 | |
| 4411 | template<> |
| 4412 | bool |
| 4413 | Target_s390<32>::ss_match_l_r14(unsigned char* view, |
| 4414 | section_size_type view_size, |
| 4415 | section_offset_type *offset) const |
| 4416 | { |
| 4417 | static const unsigned char ss_code_l_r14[] = { |
| 4418 | 0x58, 0xe0, 0xf0, 0x04, // l %r14, 4(%r15) |
| 4419 | }; |
| 4420 | if (!this->match_view_u(view, view_size, *offset, ss_code_l_r14, |
| 4421 | sizeof ss_code_l_r14)) |
| 4422 | return false; |
| 4423 | *offset += sizeof ss_code_l_r14; |
| 4424 | return true; |
| 4425 | } |
| 4426 | |
| 4427 | template<> |
| 4428 | bool |
| 4429 | Target_s390<64>::ss_match_l_r14(unsigned char* view, |
| 4430 | section_size_type view_size, |
| 4431 | section_offset_type *offset) const |
| 4432 | { |
| 4433 | static const unsigned char ss_code_l_r14[] = { |
| 4434 | 0xe3, 0xe0, 0xf0, 0x08, 0x00, 0x04 // lg %r14, 8(%r15) |
| 4435 | }; |
| 4436 | if (!this->match_view_u(view, view_size, *offset, ss_code_l_r14, |
| 4437 | sizeof ss_code_l_r14)) |
| 4438 | return false; |
| 4439 | *offset += sizeof ss_code_l_r14; |
| 4440 | return true; |
| 4441 | } |
| 4442 | |
| 4443 | template<int size> |
| 4444 | bool |
| 4445 | Target_s390<size>::ss_match_mcount(unsigned char* view, |
| 4446 | section_size_type view_size, |
| 4447 | section_offset_type *offset) const |
| 4448 | { |
| 4449 | // Match the mcount call sequence. |
| 4450 | section_offset_type myoff = *offset; |
| 4451 | |
| 4452 | // First, look for the store instruction saving %r14. |
| 4453 | if (!this->ss_match_st_r14(view, view_size, &myoff)) |
| 4454 | return false; |
| 4455 | |
| 4456 | // Now, param load and the actual call. |
| 4457 | if (this->match_view_u(view, view_size, myoff, ss_code_larl, |
| 4458 | sizeof ss_code_larl)) |
| 4459 | { |
| 4460 | myoff += sizeof ss_code_larl + 4; |
| 4461 | |
| 4462 | // After larl, expect a brasl. |
| 4463 | if (!this->match_view_u(view, view_size, myoff, ss_code_brasl, |
| 4464 | sizeof ss_code_brasl)) |
| 4465 | return false; |
| 4466 | myoff += sizeof ss_code_brasl + 4; |
| 4467 | } |
| 4468 | else if (size == 32 && |
| 4469 | this->match_view_u(view, view_size, myoff, ss_code_bras_8, |
| 4470 | sizeof ss_code_bras_8)) |
| 4471 | { |
| 4472 | // The bras skips over a block of 8 bytes, loading its address |
| 4473 | // to %r1. |
| 4474 | myoff += sizeof ss_code_bras_8 + 8; |
| 4475 | |
| 4476 | // Now, there are two sequences used for actual load and call, |
| 4477 | // absolute and PIC. |
| 4478 | if (this->match_view_u(view, view_size, myoff, ss_code_l_basr, |
| 4479 | sizeof ss_code_l_basr)) |
| 4480 | myoff += sizeof ss_code_l_basr; |
| 4481 | else if (this->match_view_u(view, view_size, myoff, ss_code_a_basr, |
| 4482 | sizeof ss_code_a_basr)) |
| 4483 | myoff += sizeof ss_code_a_basr; |
| 4484 | else |
| 4485 | return false; |
| 4486 | } |
| 4487 | else |
| 4488 | return false; |
| 4489 | |
| 4490 | // Finally, a load bringing %r14 back. |
| 4491 | if (!this->ss_match_l_r14(view, view_size, &myoff)) |
| 4492 | return false; |
| 4493 | |
| 4494 | // Found it. |
| 4495 | *offset = myoff; |
| 4496 | return true; |
| 4497 | } |
| 4498 | |
| 4499 | template<> |
| 4500 | bool |
| 4501 | Target_s390<32>::ss_match_ear(unsigned char* view, |
| 4502 | section_size_type view_size, |
| 4503 | section_offset_type *offset) const |
| 4504 | { |
| 4505 | static const unsigned char ss_code_ear[] = { |
| 4506 | 0xb2, 0x4f, 0x00, 0x10, // ear %r1, %a0 |
| 4507 | }; |
| 4508 | if (!this->match_view_u(view, view_size, *offset, ss_code_ear, |
| 4509 | sizeof ss_code_ear)) |
| 4510 | return false; |
| 4511 | *offset += sizeof ss_code_ear; |
| 4512 | return true; |
| 4513 | } |
| 4514 | |
| 4515 | template<> |
| 4516 | bool |
| 4517 | Target_s390<64>::ss_match_ear(unsigned char* view, |
| 4518 | section_size_type view_size, |
| 4519 | section_offset_type *offset) const |
| 4520 | { |
| 4521 | static const unsigned char ss_code_ear[] = { |
| 4522 | 0xb2, 0x4f, 0x00, 0x10, // ear %r1, %a0 |
| 4523 | 0xeb, 0x11, 0x00, 0x20, 0x00, 0x0d, // sllg %r1,%r1,32 |
| 4524 | 0xb2, 0x4f, 0x00, 0x11, // ear %r1, %a1 |
| 4525 | }; |
| 4526 | if (!this->match_view_u(view, view_size, *offset, ss_code_ear, |
| 4527 | sizeof ss_code_ear)) |
| 4528 | return false; |
| 4529 | *offset += sizeof ss_code_ear; |
| 4530 | return true; |
| 4531 | } |
| 4532 | |
| 4533 | template<> |
| 4534 | bool |
| 4535 | Target_s390<32>::ss_match_c(unsigned char* view, |
| 4536 | section_size_type view_size, |
| 4537 | section_offset_type *offset) const |
| 4538 | { |
| 4539 | static const unsigned char ss_code_c[] = { |
| 4540 | 0x59, 0xf0, 0x10, 0x20, // c %r15, 0x20(%r1) |
| 4541 | }; |
| 4542 | if (!this->match_view_u(view, view_size, *offset, ss_code_c, |
| 4543 | sizeof ss_code_c)) |
| 4544 | return false; |
| 4545 | *offset += sizeof ss_code_c; |
| 4546 | return true; |
| 4547 | } |
| 4548 | |
| 4549 | template<> |
| 4550 | bool |
| 4551 | Target_s390<64>::ss_match_c(unsigned char* view, |
| 4552 | section_size_type view_size, |
| 4553 | section_offset_type *offset) const |
| 4554 | { |
| 4555 | static const unsigned char ss_code_c[] = { |
| 4556 | 0xe3, 0xf0, 0x10, 0x38, 0x00, 0x20, // cg %r15, 0x38(%r1) |
| 4557 | }; |
| 4558 | if (!this->match_view_u(view, view_size, *offset, ss_code_c, |
| 4559 | sizeof ss_code_c)) |
| 4560 | return false; |
| 4561 | *offset += sizeof ss_code_c; |
| 4562 | return true; |
| 4563 | } |
| 4564 | |
| 4565 | template<> |
| 4566 | bool |
| 4567 | Target_s390<32>::ss_match_l(unsigned char* view, |
| 4568 | section_size_type view_size, |
| 4569 | section_offset_type *offset, |
| 4570 | int *guard_reg) const |
| 4571 | { |
| 4572 | // l %guard_reg, 0x20(%r1) |
| 4573 | if (convert_to_section_size_type(*offset + 4) > view_size |
| 4574 | || view[*offset] != 0x58 |
| 4575 | || (view[*offset + 1] & 0xf) != 0x0 |
| 4576 | || view[*offset + 2] != 0x10 |
| 4577 | || view[*offset + 3] != 0x20) |
| 4578 | return false; |
| 4579 | *offset += 4; |
| 4580 | *guard_reg = view[*offset + 1] >> 4 & 0xf; |
| 4581 | return true; |
| 4582 | } |
| 4583 | |
| 4584 | template<> |
| 4585 | bool |
| 4586 | Target_s390<64>::ss_match_l(unsigned char* view, |
| 4587 | section_size_type view_size, |
| 4588 | section_offset_type *offset, |
| 4589 | int *guard_reg) const |
| 4590 | { |
| 4591 | // lg %guard_reg, 0x38(%r1) |
| 4592 | if (convert_to_section_size_type(*offset + 6) > view_size |
| 4593 | || view[*offset] != 0xe3 |
| 4594 | || (view[*offset + 1] & 0xf) != 0x0 |
| 4595 | || view[*offset + 2] != 0x10 |
| 4596 | || view[*offset + 3] != 0x38 |
| 4597 | || view[*offset + 4] != 0x00 |
| 4598 | || view[*offset + 5] != 0x04) |
| 4599 | return false; |
| 4600 | *offset += 6; |
| 4601 | *guard_reg = view[*offset + 1] >> 4 & 0xf; |
| 4602 | return true; |
| 4603 | } |
| 4604 | |
| 4605 | template<int size> |
| 4606 | bool |
| 4607 | Target_s390<size>::ss_match_ahi(unsigned char* view, |
| 4608 | section_size_type view_size, |
| 4609 | section_offset_type *offset, |
| 4610 | int guard_reg, |
| 4611 | uint32_t *arg) const |
| 4612 | { |
| 4613 | int op = size == 32 ? 0xa : 0xb; |
| 4614 | // a[g]hi %guard_reg, <arg> |
| 4615 | if (convert_to_section_size_type(*offset + 4) > view_size |
| 4616 | || view[*offset] != 0xa7 |
| 4617 | || view[*offset + 1] != (guard_reg << 4 | op) |
| 4618 | // Disallow negative size. |
| 4619 | || view[*offset + 2] & 0x80) |
| 4620 | return false; |
| 4621 | *arg = elfcpp::Swap<16, true>::readval(view + *offset + 2); |
| 4622 | *offset += 4; |
| 4623 | return true; |
| 4624 | } |
| 4625 | |
| 4626 | template<int size> |
| 4627 | bool |
| 4628 | Target_s390<size>::ss_match_alfi(unsigned char* view, |
| 4629 | section_size_type view_size, |
| 4630 | section_offset_type *offset, |
| 4631 | int guard_reg, |
| 4632 | uint32_t *arg) const |
| 4633 | { |
| 4634 | int op = size == 32 ? 0xb : 0xa; |
| 4635 | // al[g]fi %guard_reg, <arg> |
| 4636 | if (convert_to_section_size_type(*offset + 6) > view_size |
| 4637 | || view[*offset] != 0xc2 |
| 4638 | || view[*offset + 1] != (guard_reg << 4 | op)) |
| 4639 | return false; |
| 4640 | *arg = elfcpp::Swap<32, true>::readval(view + *offset + 2); |
| 4641 | *offset += 6; |
| 4642 | return true; |
| 4643 | } |
| 4644 | |
| 4645 | template<> |
| 4646 | bool |
| 4647 | Target_s390<32>::ss_match_cr(unsigned char* view, |
| 4648 | section_size_type view_size, |
| 4649 | section_offset_type *offset, |
| 4650 | int guard_reg) const |
| 4651 | { |
| 4652 | // cr %r15, %guard_reg |
| 4653 | if (convert_to_section_size_type(*offset + 2) > view_size |
| 4654 | || view[*offset] != 0x19 |
| 4655 | || view[*offset + 1] != (0xf0 | guard_reg)) |
| 4656 | return false; |
| 4657 | *offset += 2; |
| 4658 | return true; |
| 4659 | } |
| 4660 | |
| 4661 | template<> |
| 4662 | bool |
| 4663 | Target_s390<64>::ss_match_cr(unsigned char* view, |
| 4664 | section_size_type view_size, |
| 4665 | section_offset_type *offset, |
| 4666 | int guard_reg) const |
| 4667 | { |
| 4668 | // cgr %r15, %guard_reg |
| 4669 | if (convert_to_section_size_type(*offset + 4) > view_size |
| 4670 | || view[*offset] != 0xb9 |
| 4671 | || view[*offset + 1] != 0x20 |
| 4672 | || view[*offset + 2] != 0x00 |
| 4673 | || view[*offset + 3] != (0xf0 | guard_reg)) |
| 4674 | return false; |
| 4675 | *offset += 4; |
| 4676 | return true; |
| 4677 | } |
| 4678 | |
| 4679 | |
| 4680 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
| 4681 | // compiled with -fsplit-stack. The function calls non-split-stack |
| 4682 | // code. We have to change the function so that it always ensures |
| 4683 | // that it has enough stack space to run some random function. |
| 4684 | |
| 4685 | template<int size> |
| 4686 | void |
| 4687 | Target_s390<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
| 4688 | section_offset_type fnoffset, |
| 4689 | section_size_type, |
| 4690 | const unsigned char *prelocs, |
| 4691 | size_t reloc_count, |
| 4692 | unsigned char* view, |
| 4693 | section_size_type view_size, |
| 4694 | std::string*, |
| 4695 | std::string*) const |
| 4696 | { |
| 4697 | // true if there's a conditional call to __morestack in the function, |
| 4698 | // false if there's an unconditional one. |
| 4699 | bool conditional = false; |
| 4700 | // Offset of the byte after the compare insn, if conditional. |
| 4701 | section_offset_type cmpend = 0; |
| 4702 | // Type and immediate offset of the add instruction that adds frame size |
| 4703 | // to guard. |
| 4704 | enum { |
| 4705 | SS_ADD_NONE, |
| 4706 | SS_ADD_AHI, |
| 4707 | SS_ADD_ALFI, |
| 4708 | } fsadd_type = SS_ADD_NONE; |
| 4709 | section_offset_type fsadd_offset = 0; |
| 4710 | uint32_t fsadd_frame_size = 0; |
| 4711 | // Register used for loading guard. Usually r1, but can also be r0 or r2-r5. |
| 4712 | int guard_reg; |
| 4713 | // Offset of the conditional jump. |
| 4714 | section_offset_type jump_offset = 0; |
| 4715 | // Section view and offset of param block. |
| 4716 | section_offset_type param_offset = 0; |
| 4717 | unsigned char *param_view = 0; |
| 4718 | section_size_type param_view_size = 0; |
| 4719 | // Current position in function. |
| 4720 | section_offset_type curoffset = fnoffset; |
| 4721 | // And the position of split-stack prologue. |
| 4722 | section_offset_type ssoffset; |
| 4723 | // Frame size. |
| 4724 | typename elfcpp::Elf_types<size>::Elf_Addr frame_size; |
| 4725 | // Relocation parsing. |
| 4726 | typedef typename Reloc_types<elfcpp::SHT_RELA, size, true>::Reloc Reltype; |
| 4727 | const int reloc_size = Reloc_types<elfcpp::SHT_RELA, size, true>::reloc_size; |
| 4728 | const unsigned char *pr = prelocs; |
| 4729 | |
| 4730 | // If the function was compiled with -pg, the profiling code may come before |
| 4731 | // the split-stack prologue. Skip it. |
| 4732 | |
| 4733 | this->ss_match_mcount(view, view_size, &curoffset); |
| 4734 | ssoffset = curoffset; |
| 4735 | |
| 4736 | // First, figure out if there's a conditional call by looking for the |
| 4737 | // extract-tp, add, cmp sequence. |
| 4738 | |
| 4739 | if (this->ss_match_ear(view, view_size, &curoffset)) |
| 4740 | { |
| 4741 | // Found extract-tp, now look for an add and compare. |
| 4742 | conditional = true; |
| 4743 | if (this->ss_match_c(view, view_size, &curoffset)) |
| 4744 | { |
| 4745 | // Found a direct compare of stack pointer with the guard, |
| 4746 | // we're done here. |
| 4747 | } |
| 4748 | else if (this->ss_match_l(view, view_size, &curoffset, &guard_reg)) |
| 4749 | { |
| 4750 | // Found a load of guard to register, look for an add and compare. |
| 4751 | if (this->ss_match_ahi(view, view_size, &curoffset, guard_reg, |
| 4752 | &fsadd_frame_size)) |
| 4753 | { |
| 4754 | fsadd_type = SS_ADD_AHI; |
| 4755 | fsadd_offset = curoffset - 2; |
| 4756 | } |
| 4757 | else if (this->ss_match_alfi(view, view_size, &curoffset, guard_reg, |
| 4758 | &fsadd_frame_size)) |
| 4759 | { |
| 4760 | fsadd_type = SS_ADD_ALFI; |
| 4761 | fsadd_offset = curoffset - 4; |
| 4762 | } |
| 4763 | else |
| 4764 | { |
| 4765 | goto bad; |
| 4766 | } |
| 4767 | // Now, there has to be a compare. |
| 4768 | if (!this->ss_match_cr(view, view_size, &curoffset, guard_reg)) |
| 4769 | goto bad; |
| 4770 | } |
| 4771 | else |
| 4772 | { |
| 4773 | goto bad; |
| 4774 | } |
| 4775 | cmpend = curoffset; |
| 4776 | } |
| 4777 | |
| 4778 | // Second, look for the call. |
| 4779 | if (!this->match_view_u(view, view_size, curoffset, ss_code_larl, |
| 4780 | sizeof ss_code_larl)) |
| 4781 | goto bad; |
| 4782 | curoffset += sizeof ss_code_larl; |
| 4783 | |
| 4784 | // Find out larl's operand. It should be a local symbol in .rodata |
| 4785 | // section. |
| 4786 | for (size_t i = 0; i < reloc_count; ++i, pr += reloc_size) |
| 4787 | { |
| 4788 | Reltype reloc(pr); |
| 4789 | if (static_cast<section_offset_type>(reloc.get_r_offset()) |
| 4790 | == curoffset) |
| 4791 | { |
| 4792 | typename elfcpp::Elf_types<size>::Elf_WXword r_info |
| 4793 | = reloc.get_r_info(); |
| 4794 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 4795 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 4796 | if (r_type != elfcpp::R_390_PC32DBL) |
| 4797 | goto bad; |
| 4798 | if (r_sym >= object->local_symbol_count()) |
| 4799 | goto bad; |
| 4800 | Sized_relobj_file<size, true> *object_sized = |
| 4801 | static_cast<Sized_relobj_file<size, true> *>(object); |
| 4802 | const Symbol_value<size>* sym = object_sized->local_symbol(r_sym); |
| 4803 | bool param_shndx_ordinary; |
| 4804 | const unsigned int param_shndx = |
| 4805 | sym->input_shndx(¶m_shndx_ordinary); |
| 4806 | if (!param_shndx_ordinary) |
| 4807 | goto bad; |
| 4808 | param_offset = sym->input_value() + reloc.get_r_addend() - 2 |
| 4809 | - object->output_section(param_shndx)->address() |
| 4810 | - object->output_section_offset(param_shndx); |
| 4811 | param_view = object->get_output_view(param_shndx, |
| 4812 | ¶m_view_size); |
| 4813 | break; |
| 4814 | } |
| 4815 | } |
| 4816 | |
| 4817 | if (!param_view) |
| 4818 | goto bad; |
| 4819 | |
| 4820 | curoffset += 4; |
| 4821 | |
| 4822 | // Now, there has to be a jump to __morestack. |
| 4823 | jump_offset = curoffset; |
| 4824 | |
| 4825 | if (this->match_view_u(view, view_size, curoffset, |
| 4826 | conditional ? ss_code_jgl : ss_code_jg, |
| 4827 | sizeof ss_code_jg)) |
| 4828 | curoffset += sizeof ss_code_jg; |
| 4829 | else |
| 4830 | goto bad; |
| 4831 | |
| 4832 | curoffset += 4; |
| 4833 | |
| 4834 | // Read the frame size. |
| 4835 | if (convert_to_section_size_type(param_offset + size / 8) > param_view_size) |
| 4836 | goto bad; |
| 4837 | frame_size = elfcpp::Swap<size, true>::readval(param_view + param_offset); |
| 4838 | |
| 4839 | // Sanity check. |
| 4840 | if (fsadd_type != SS_ADD_NONE && fsadd_frame_size != frame_size) |
| 4841 | goto bad; |
| 4842 | |
| 4843 | // Bump the frame size. |
| 4844 | frame_size += parameters->options().split_stack_adjust_size(); |
| 4845 | |
| 4846 | // Store it to the param block. |
| 4847 | elfcpp::Swap<size, true>::writeval(param_view + param_offset, frame_size); |
| 4848 | |
| 4849 | if (!conditional) |
| 4850 | { |
| 4851 | // If the call was already unconditional, we're done. |
| 4852 | } |
| 4853 | else if (frame_size <= 0xffffffff && fsadd_type == SS_ADD_ALFI) |
| 4854 | { |
| 4855 | // Using alfi to add the frame size, and it still fits. Adjust it. |
| 4856 | elfcpp::Swap_unaligned<32, true>::writeval(view + fsadd_offset, |
| 4857 | frame_size); |
| 4858 | } |
| 4859 | else |
| 4860 | { |
| 4861 | // We were either relying on the backoff area, or used ahi to load |
| 4862 | // frame size. This won't fly, as our new frame size is too large. |
| 4863 | // Convert the sequence to unconditional by nopping out the comparison, |
| 4864 | // and rewiring the jump. |
| 4865 | this->set_view_to_nop(view, view_size, ssoffset, cmpend - ssoffset); |
| 4866 | |
| 4867 | // The jump is jgl, we'll mutate it to jg. |
| 4868 | view[jump_offset+1] = 0xf4; |
| 4869 | } |
| 4870 | |
| 4871 | return; |
| 4872 | |
| 4873 | bad: |
| 4874 | if (!object->has_no_split_stack()) |
| 4875 | object->error(_("failed to match split-stack sequence at " |
| 4876 | "section %u offset %0zx"), |
| 4877 | shndx, static_cast<size_t>(fnoffset)); |
| 4878 | } |
| 4879 | |
| 4880 | // Relocate section data. |
| 4881 | |
| 4882 | template<int size> |
| 4883 | void |
| 4884 | Target_s390<size>::relocate_section( |
| 4885 | const Relocate_info<size, true>* relinfo, |
| 4886 | unsigned int sh_type, |
| 4887 | const unsigned char* prelocs, |
| 4888 | size_t reloc_count, |
| 4889 | Output_section* output_section, |
| 4890 | bool needs_special_offset_handling, |
| 4891 | unsigned char* view, |
| 4892 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 4893 | section_size_type view_size, |
| 4894 | const Reloc_symbol_changes* reloc_symbol_changes) |
| 4895 | { |
| 4896 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true> |
| 4897 | Classify_reloc; |
| 4898 | |
| 4899 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 4900 | |
| 4901 | gold::relocate_section<size, true, Target_s390<size>, Relocate, |
| 4902 | gold::Default_comdat_behavior, Classify_reloc>( |
| 4903 | relinfo, |
| 4904 | this, |
| 4905 | prelocs, |
| 4906 | reloc_count, |
| 4907 | output_section, |
| 4908 | needs_special_offset_handling, |
| 4909 | view, |
| 4910 | address, |
| 4911 | view_size, |
| 4912 | reloc_symbol_changes); |
| 4913 | } |
| 4914 | |
| 4915 | // Apply an incremental relocation. Incremental relocations always refer |
| 4916 | // to global symbols. |
| 4917 | |
| 4918 | template<int size> |
| 4919 | void |
| 4920 | Target_s390<size>::apply_relocation( |
| 4921 | const Relocate_info<size, true>* relinfo, |
| 4922 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, |
| 4923 | unsigned int r_type, |
| 4924 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
| 4925 | const Symbol* gsym, |
| 4926 | unsigned char* view, |
| 4927 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 4928 | section_size_type view_size) |
| 4929 | { |
| 4930 | gold::apply_relocation<size, true, Target_s390<size>, |
| 4931 | typename Target_s390<size>::Relocate>( |
| 4932 | relinfo, |
| 4933 | this, |
| 4934 | r_offset, |
| 4935 | r_type, |
| 4936 | r_addend, |
| 4937 | gsym, |
| 4938 | view, |
| 4939 | address, |
| 4940 | view_size); |
| 4941 | } |
| 4942 | |
| 4943 | // The selector for s390 object files. |
| 4944 | |
| 4945 | template<int size> |
| 4946 | class Target_selector_s390 : public Target_selector |
| 4947 | { |
| 4948 | public: |
| 4949 | Target_selector_s390() |
| 4950 | : Target_selector(elfcpp::EM_S390, size, true, |
| 4951 | (size == 64 ? "elf64-s390" : "elf32-s390"), |
| 4952 | (size == 64 ? "elf64_s390" : "elf32_s390")) |
| 4953 | { } |
| 4954 | |
| 4955 | virtual Target* |
| 4956 | do_instantiate_target() |
| 4957 | { return new Target_s390<size>(); } |
| 4958 | }; |
| 4959 | |
| 4960 | Target_selector_s390<32> target_selector_s390; |
| 4961 | Target_selector_s390<64> target_selector_s390x; |
| 4962 | |
| 4963 | } // End anonymous namespace. |