| 1 | // powerpc.cc -- powerpc target support for gold. |
| 2 | |
| 3 | // Copyright 2008, 2009 Free Software Foundation, Inc. |
| 4 | // Written by David S. Miller <davem@davemloft.net> |
| 5 | // and David Edelsohn <edelsohn@gnu.org> |
| 6 | |
| 7 | // This file is part of gold. |
| 8 | |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; either version 3 of the License, or |
| 12 | // (at your option) any later version. |
| 13 | |
| 14 | // This program is distributed in the hope that it will be useful, |
| 15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | // GNU General Public License for more details. |
| 18 | |
| 19 | // You should have received a copy of the GNU General Public License |
| 20 | // along with this program; if not, write to the Free Software |
| 21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 22 | // MA 02110-1301, USA. |
| 23 | |
| 24 | #include "gold.h" |
| 25 | |
| 26 | #include "elfcpp.h" |
| 27 | #include "parameters.h" |
| 28 | #include "reloc.h" |
| 29 | #include "powerpc.h" |
| 30 | #include "object.h" |
| 31 | #include "symtab.h" |
| 32 | #include "layout.h" |
| 33 | #include "output.h" |
| 34 | #include "copy-relocs.h" |
| 35 | #include "target.h" |
| 36 | #include "target-reloc.h" |
| 37 | #include "target-select.h" |
| 38 | #include "tls.h" |
| 39 | #include "errors.h" |
| 40 | #include "gc.h" |
| 41 | |
| 42 | namespace |
| 43 | { |
| 44 | |
| 45 | using namespace gold; |
| 46 | |
| 47 | template<int size, bool big_endian> |
| 48 | class Output_data_plt_powerpc; |
| 49 | |
| 50 | template<int size, bool big_endian> |
| 51 | class Target_powerpc : public Sized_target<size, big_endian> |
| 52 | { |
| 53 | public: |
| 54 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> Reloc_section; |
| 55 | |
| 56 | Target_powerpc() |
| 57 | : Sized_target<size, big_endian>(&powerpc_info), |
| 58 | got_(NULL), got2_(NULL), toc_(NULL), |
| 59 | plt_(NULL), rela_dyn_(NULL), |
| 60 | copy_relocs_(elfcpp::R_POWERPC_COPY), |
| 61 | dynbss_(NULL), got_mod_index_offset_(-1U) |
| 62 | { |
| 63 | } |
| 64 | |
| 65 | // Process the relocations to determine unreferenced sections for |
| 66 | // garbage collection. |
| 67 | void |
| 68 | gc_process_relocs(const General_options& options, |
| 69 | Symbol_table* symtab, |
| 70 | Layout* layout, |
| 71 | Sized_relobj<size, big_endian>* object, |
| 72 | unsigned int data_shndx, |
| 73 | unsigned int sh_type, |
| 74 | const unsigned char* prelocs, |
| 75 | size_t reloc_count, |
| 76 | Output_section* output_section, |
| 77 | bool needs_special_offset_handling, |
| 78 | size_t local_symbol_count, |
| 79 | const unsigned char* plocal_symbols); |
| 80 | |
| 81 | // Scan the relocations to look for symbol adjustments. |
| 82 | void |
| 83 | scan_relocs(const General_options& options, |
| 84 | Symbol_table* symtab, |
| 85 | Layout* layout, |
| 86 | Sized_relobj<size, big_endian>* object, |
| 87 | unsigned int data_shndx, |
| 88 | unsigned int sh_type, |
| 89 | const unsigned char* prelocs, |
| 90 | size_t reloc_count, |
| 91 | Output_section* output_section, |
| 92 | bool needs_special_offset_handling, |
| 93 | size_t local_symbol_count, |
| 94 | const unsigned char* plocal_symbols); |
| 95 | // Finalize the sections. |
| 96 | void |
| 97 | do_finalize_sections(Layout*); |
| 98 | |
| 99 | // Return the value to use for a dynamic which requires special |
| 100 | // treatment. |
| 101 | uint64_t |
| 102 | do_dynsym_value(const Symbol*) const; |
| 103 | |
| 104 | // Relocate a section. |
| 105 | void |
| 106 | relocate_section(const Relocate_info<size, big_endian>*, |
| 107 | unsigned int sh_type, |
| 108 | const unsigned char* prelocs, |
| 109 | size_t reloc_count, |
| 110 | Output_section* output_section, |
| 111 | bool needs_special_offset_handling, |
| 112 | unsigned char* view, |
| 113 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 114 | section_size_type view_size, |
| 115 | const Reloc_symbol_changes*); |
| 116 | |
| 117 | // Scan the relocs during a relocatable link. |
| 118 | void |
| 119 | scan_relocatable_relocs(const General_options& options, |
| 120 | Symbol_table* symtab, |
| 121 | Layout* layout, |
| 122 | Sized_relobj<size, big_endian>* object, |
| 123 | unsigned int data_shndx, |
| 124 | unsigned int sh_type, |
| 125 | const unsigned char* prelocs, |
| 126 | size_t reloc_count, |
| 127 | Output_section* output_section, |
| 128 | bool needs_special_offset_handling, |
| 129 | size_t local_symbol_count, |
| 130 | const unsigned char* plocal_symbols, |
| 131 | Relocatable_relocs*); |
| 132 | |
| 133 | // Relocate a section during a relocatable link. |
| 134 | void |
| 135 | relocate_for_relocatable(const Relocate_info<size, big_endian>*, |
| 136 | unsigned int sh_type, |
| 137 | const unsigned char* prelocs, |
| 138 | size_t reloc_count, |
| 139 | Output_section* output_section, |
| 140 | off_t offset_in_output_section, |
| 141 | const Relocatable_relocs*, |
| 142 | unsigned char* view, |
| 143 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 144 | section_size_type view_size, |
| 145 | unsigned char* reloc_view, |
| 146 | section_size_type reloc_view_size); |
| 147 | |
| 148 | // Return whether SYM is defined by the ABI. |
| 149 | bool |
| 150 | do_is_defined_by_abi(const Symbol* sym) const |
| 151 | { |
| 152 | return strcmp(sym->name(), "___tls_get_addr") == 0; |
| 153 | } |
| 154 | |
| 155 | // Return the size of the GOT section. |
| 156 | section_size_type |
| 157 | got_size() |
| 158 | { |
| 159 | gold_assert(this->got_ != NULL); |
| 160 | return this->got_->data_size(); |
| 161 | } |
| 162 | |
| 163 | private: |
| 164 | |
| 165 | // The class which scans relocations. |
| 166 | class Scan |
| 167 | { |
| 168 | public: |
| 169 | Scan() |
| 170 | : issued_non_pic_error_(false) |
| 171 | { } |
| 172 | |
| 173 | inline void |
| 174 | local(const General_options& options, Symbol_table* symtab, |
| 175 | Layout* layout, Target_powerpc* target, |
| 176 | Sized_relobj<size, big_endian>* object, |
| 177 | unsigned int data_shndx, |
| 178 | Output_section* output_section, |
| 179 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 180 | const elfcpp::Sym<size, big_endian>& lsym); |
| 181 | |
| 182 | inline void |
| 183 | global(const General_options& options, Symbol_table* symtab, |
| 184 | Layout* layout, Target_powerpc* target, |
| 185 | Sized_relobj<size, big_endian>* object, |
| 186 | unsigned int data_shndx, |
| 187 | Output_section* output_section, |
| 188 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 189 | Symbol* gsym); |
| 190 | |
| 191 | private: |
| 192 | static void |
| 193 | unsupported_reloc_local(Sized_relobj<size, big_endian>*, |
| 194 | unsigned int r_type); |
| 195 | |
| 196 | static void |
| 197 | unsupported_reloc_global(Sized_relobj<size, big_endian>*, |
| 198 | unsigned int r_type, Symbol*); |
| 199 | |
| 200 | static void |
| 201 | generate_tls_call(Symbol_table* symtab, Layout* layout, |
| 202 | Target_powerpc* target); |
| 203 | |
| 204 | void |
| 205 | check_non_pic(Relobj*, unsigned int r_type); |
| 206 | |
| 207 | // Whether we have issued an error about a non-PIC compilation. |
| 208 | bool issued_non_pic_error_; |
| 209 | }; |
| 210 | |
| 211 | // The class which implements relocation. |
| 212 | class Relocate |
| 213 | { |
| 214 | public: |
| 215 | // Do a relocation. Return false if the caller should not issue |
| 216 | // any warnings about this relocation. |
| 217 | inline bool |
| 218 | relocate(const Relocate_info<size, big_endian>*, Target_powerpc*, |
| 219 | Output_section*, size_t relnum, |
| 220 | const elfcpp::Rela<size, big_endian>&, |
| 221 | unsigned int r_type, const Sized_symbol<size>*, |
| 222 | const Symbol_value<size>*, |
| 223 | unsigned char*, |
| 224 | typename elfcpp::Elf_types<size>::Elf_Addr, |
| 225 | section_size_type); |
| 226 | |
| 227 | private: |
| 228 | // Do a TLS relocation. |
| 229 | inline void |
| 230 | relocate_tls(const Relocate_info<size, big_endian>*, |
| 231 | Target_powerpc* target, |
| 232 | size_t relnum, const elfcpp::Rela<size, big_endian>&, |
| 233 | unsigned int r_type, const Sized_symbol<size>*, |
| 234 | const Symbol_value<size>*, |
| 235 | unsigned char*, |
| 236 | typename elfcpp::Elf_types<size>::Elf_Addr, |
| 237 | section_size_type); |
| 238 | }; |
| 239 | |
| 240 | // A class which returns the size required for a relocation type, |
| 241 | // used while scanning relocs during a relocatable link. |
| 242 | class Relocatable_size_for_reloc |
| 243 | { |
| 244 | public: |
| 245 | unsigned int |
| 246 | get_size_for_reloc(unsigned int, Relobj*); |
| 247 | }; |
| 248 | |
| 249 | // Get the GOT section, creating it if necessary. |
| 250 | Output_data_got<size, big_endian>* |
| 251 | got_section(Symbol_table*, Layout*); |
| 252 | |
| 253 | Output_data_space* |
| 254 | got2_section() const |
| 255 | { |
| 256 | gold_assert (this->got2_ != NULL); |
| 257 | return this->got2_; |
| 258 | } |
| 259 | |
| 260 | // Get the TOC section. |
| 261 | Output_data_space* |
| 262 | toc_section() const |
| 263 | { |
| 264 | gold_assert (this->toc_ != NULL); |
| 265 | return this->toc_; |
| 266 | } |
| 267 | |
| 268 | // Create a PLT entry for a global symbol. |
| 269 | void |
| 270 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
| 271 | |
| 272 | // Create a GOT entry for the TLS module index. |
| 273 | unsigned int |
| 274 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
| 275 | Sized_relobj<size, big_endian>* object); |
| 276 | |
| 277 | // Get the PLT section. |
| 278 | const Output_data_plt_powerpc<size, big_endian>* |
| 279 | plt_section() const |
| 280 | { |
| 281 | gold_assert(this->plt_ != NULL); |
| 282 | return this->plt_; |
| 283 | } |
| 284 | |
| 285 | // Get the dynamic reloc section, creating it if necessary. |
| 286 | Reloc_section* |
| 287 | rela_dyn_section(Layout*); |
| 288 | |
| 289 | // Copy a relocation against a global symbol. |
| 290 | void |
| 291 | copy_reloc(Symbol_table* symtab, Layout* layout, |
| 292 | Sized_relobj<size, big_endian>* object, |
| 293 | unsigned int shndx, Output_section* output_section, |
| 294 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) |
| 295 | { |
| 296 | this->copy_relocs_.copy_reloc(symtab, layout, |
| 297 | symtab->get_sized_symbol<size>(sym), |
| 298 | object, shndx, output_section, |
| 299 | reloc, this->rela_dyn_section(layout)); |
| 300 | } |
| 301 | |
| 302 | // Information about this specific target which we pass to the |
| 303 | // general Target structure. |
| 304 | static Target::Target_info powerpc_info; |
| 305 | |
| 306 | // The types of GOT entries needed for this platform. |
| 307 | enum Got_type |
| 308 | { |
| 309 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol |
| 310 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset |
| 311 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair |
| 312 | }; |
| 313 | |
| 314 | // The GOT section. |
| 315 | Output_data_got<size, big_endian>* got_; |
| 316 | // The GOT2 section. |
| 317 | Output_data_space* got2_; |
| 318 | // The TOC section. |
| 319 | Output_data_space* toc_; |
| 320 | // The PLT section. |
| 321 | Output_data_plt_powerpc<size, big_endian>* plt_; |
| 322 | // The dynamic reloc section. |
| 323 | Reloc_section* rela_dyn_; |
| 324 | // Relocs saved to avoid a COPY reloc. |
| 325 | Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; |
| 326 | // Space for variables copied with a COPY reloc. |
| 327 | Output_data_space* dynbss_; |
| 328 | // Offset of the GOT entry for the TLS module index; |
| 329 | unsigned int got_mod_index_offset_; |
| 330 | }; |
| 331 | |
| 332 | template<> |
| 333 | Target::Target_info Target_powerpc<32, true>::powerpc_info = |
| 334 | { |
| 335 | 32, // size |
| 336 | true, // is_big_endian |
| 337 | elfcpp::EM_PPC, // machine_code |
| 338 | false, // has_make_symbol |
| 339 | false, // has_resolve |
| 340 | false, // has_code_fill |
| 341 | true, // is_default_stack_executable |
| 342 | '\0', // wrap_char |
| 343 | "/usr/lib/ld.so.1", // dynamic_linker |
| 344 | 0x10000000, // default_text_segment_address |
| 345 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 346 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 347 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 348 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 349 | 0, // small_common_section_flags |
| 350 | 0 // large_common_section_flags |
| 351 | }; |
| 352 | |
| 353 | template<> |
| 354 | Target::Target_info Target_powerpc<32, false>::powerpc_info = |
| 355 | { |
| 356 | 32, // size |
| 357 | false, // is_big_endian |
| 358 | elfcpp::EM_PPC, // machine_code |
| 359 | false, // has_make_symbol |
| 360 | false, // has_resolve |
| 361 | false, // has_code_fill |
| 362 | true, // is_default_stack_executable |
| 363 | '\0', // wrap_char |
| 364 | "/usr/lib/ld.so.1", // dynamic_linker |
| 365 | 0x10000000, // default_text_segment_address |
| 366 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 367 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 368 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 369 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 370 | 0, // small_common_section_flags |
| 371 | 0 // large_common_section_flags |
| 372 | }; |
| 373 | |
| 374 | template<> |
| 375 | Target::Target_info Target_powerpc<64, true>::powerpc_info = |
| 376 | { |
| 377 | 64, // size |
| 378 | true, // is_big_endian |
| 379 | elfcpp::EM_PPC64, // machine_code |
| 380 | false, // has_make_symbol |
| 381 | false, // has_resolve |
| 382 | false, // has_code_fill |
| 383 | true, // is_default_stack_executable |
| 384 | '\0', // wrap_char |
| 385 | "/usr/lib/ld.so.1", // dynamic_linker |
| 386 | 0x10000000, // default_text_segment_address |
| 387 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 388 | 8 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 389 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 390 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 391 | 0, // small_common_section_flags |
| 392 | 0 // large_common_section_flags |
| 393 | }; |
| 394 | |
| 395 | template<> |
| 396 | Target::Target_info Target_powerpc<64, false>::powerpc_info = |
| 397 | { |
| 398 | 64, // size |
| 399 | false, // is_big_endian |
| 400 | elfcpp::EM_PPC64, // machine_code |
| 401 | false, // has_make_symbol |
| 402 | false, // has_resolve |
| 403 | false, // has_code_fill |
| 404 | true, // is_default_stack_executable |
| 405 | '\0', // wrap_char |
| 406 | "/usr/lib/ld.so.1", // dynamic_linker |
| 407 | 0x10000000, // default_text_segment_address |
| 408 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 409 | 8 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 410 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 411 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 412 | 0, // small_common_section_flags |
| 413 | 0 // large_common_section_flags |
| 414 | }; |
| 415 | |
| 416 | template<int size, bool big_endian> |
| 417 | class Powerpc_relocate_functions |
| 418 | { |
| 419 | private: |
| 420 | // Do a simple relocation with the addend in the relocation. |
| 421 | template<int valsize> |
| 422 | static inline void |
| 423 | rela(unsigned char* view, |
| 424 | unsigned int right_shift, |
| 425 | elfcpp::Elf_Xword dst_mask, |
| 426 | typename elfcpp::Swap<size, big_endian>::Valtype value, |
| 427 | typename elfcpp::Swap<size, big_endian>::Valtype addend) |
| 428 | { |
| 429 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 430 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 431 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 432 | Valtype reloc = ((value + addend) >> right_shift); |
| 433 | |
| 434 | val &= ~dst_mask; |
| 435 | reloc &= dst_mask; |
| 436 | |
| 437 | elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); |
| 438 | } |
| 439 | |
| 440 | // Do a simple relocation using a symbol value with the addend in |
| 441 | // the relocation. |
| 442 | template<int valsize> |
| 443 | static inline void |
| 444 | rela(unsigned char* view, |
| 445 | unsigned int right_shift, |
| 446 | elfcpp::Elf_Xword dst_mask, |
| 447 | const Sized_relobj<size, big_endian>* object, |
| 448 | const Symbol_value<size>* psymval, |
| 449 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) |
| 450 | { |
| 451 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 452 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 453 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 454 | Valtype reloc = (psymval->value(object, addend) >> right_shift); |
| 455 | |
| 456 | val &= ~dst_mask; |
| 457 | reloc &= dst_mask; |
| 458 | |
| 459 | elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); |
| 460 | } |
| 461 | |
| 462 | // Do a simple relocation using a symbol value with the addend in |
| 463 | // the relocation, unaligned. |
| 464 | template<int valsize> |
| 465 | static inline void |
| 466 | rela_ua(unsigned char* view, unsigned int right_shift, |
| 467 | elfcpp::Elf_Xword dst_mask, |
| 468 | const Sized_relobj<size, big_endian>* object, |
| 469 | const Symbol_value<size>* psymval, |
| 470 | typename elfcpp::Swap<size, big_endian>::Valtype addend) |
| 471 | { |
| 472 | typedef typename elfcpp::Swap_unaligned<valsize, |
| 473 | big_endian>::Valtype Valtype; |
| 474 | unsigned char* wv = view; |
| 475 | Valtype val = elfcpp::Swap_unaligned<valsize, big_endian>::readval(wv); |
| 476 | Valtype reloc = (psymval->value(object, addend) >> right_shift); |
| 477 | |
| 478 | val &= ~dst_mask; |
| 479 | reloc &= dst_mask; |
| 480 | |
| 481 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, val | reloc); |
| 482 | } |
| 483 | |
| 484 | // Do a simple PC relative relocation with a Symbol_value with the |
| 485 | // addend in the relocation. |
| 486 | template<int valsize> |
| 487 | static inline void |
| 488 | pcrela(unsigned char* view, unsigned int right_shift, |
| 489 | elfcpp::Elf_Xword dst_mask, |
| 490 | const Sized_relobj<size, big_endian>* object, |
| 491 | const Symbol_value<size>* psymval, |
| 492 | typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| 493 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 494 | { |
| 495 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 496 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 497 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 498 | Valtype reloc = ((psymval->value(object, addend) - address) |
| 499 | >> right_shift); |
| 500 | |
| 501 | val &= ~dst_mask; |
| 502 | reloc &= dst_mask; |
| 503 | |
| 504 | elfcpp::Swap<valsize, big_endian>::writeval(wv, val | reloc); |
| 505 | } |
| 506 | |
| 507 | template<int valsize> |
| 508 | static inline void |
| 509 | pcrela_unaligned(unsigned char* view, |
| 510 | const Sized_relobj<size, big_endian>* object, |
| 511 | const Symbol_value<size>* psymval, |
| 512 | typename elfcpp::Swap<size, big_endian>::Valtype addend, |
| 513 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 514 | { |
| 515 | typedef typename elfcpp::Swap_unaligned<valsize, |
| 516 | big_endian>::Valtype Valtype; |
| 517 | unsigned char* wv = view; |
| 518 | Valtype reloc = (psymval->value(object, addend) - address); |
| 519 | |
| 520 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(wv, reloc); |
| 521 | } |
| 522 | |
| 523 | typedef Powerpc_relocate_functions<size, big_endian> This; |
| 524 | typedef Relocate_functions<size, big_endian> This_reloc; |
| 525 | public: |
| 526 | // R_POWERPC_REL32: (Symbol + Addend - Address) |
| 527 | static inline void |
| 528 | rel32(unsigned char* view, |
| 529 | const Sized_relobj<size, big_endian>* object, |
| 530 | const Symbol_value<size>* psymval, |
| 531 | typename elfcpp::Elf_types<size>::Elf_Addr addend, |
| 532 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 533 | { This_reloc::pcrela32(view, object, psymval, addend, address); } |
| 534 | |
| 535 | // R_POWERPC_REL24: (Symbol + Addend - Address) & 0x3fffffc |
| 536 | static inline void |
| 537 | rel24(unsigned char* view, |
| 538 | const Sized_relobj<size, big_endian>* object, |
| 539 | const Symbol_value<size>* psymval, |
| 540 | typename elfcpp::Elf_types<size>::Elf_Addr addend, |
| 541 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 542 | { |
| 543 | This::template pcrela<32>(view, 0, 0x03fffffc, object, |
| 544 | psymval, addend, address); |
| 545 | } |
| 546 | |
| 547 | // R_POWERPC_REL14: (Symbol + Addend - Address) & 0xfffc |
| 548 | static inline void |
| 549 | rel14(unsigned char* view, |
| 550 | const Sized_relobj<size, big_endian>* object, |
| 551 | const Symbol_value<size>* psymval, |
| 552 | typename elfcpp::Elf_types<size>::Elf_Addr addend, |
| 553 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 554 | { |
| 555 | This::template pcrela<32>(view, 0, 0x0000fffc, object, |
| 556 | psymval, addend, address); |
| 557 | } |
| 558 | |
| 559 | // R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff |
| 560 | static inline void |
| 561 | addr16(unsigned char* view, |
| 562 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 563 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 564 | { This_reloc::rela16(view, value, addend); } |
| 565 | |
| 566 | static inline void |
| 567 | addr16(unsigned char* view, |
| 568 | const Sized_relobj<size, big_endian>* object, |
| 569 | const Symbol_value<size>* psymval, |
| 570 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 571 | { This_reloc::rela16(view, object, psymval, addend); } |
| 572 | |
| 573 | // R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc |
| 574 | static inline void |
| 575 | addr16_ds(unsigned char* view, |
| 576 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 577 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 578 | { |
| 579 | This::template rela<16>(view, 0, 0xfffc, value, addend); |
| 580 | } |
| 581 | |
| 582 | // R_POWERPC_ADDR16_LO: (Symbol + Addend) & 0xffff |
| 583 | static inline void |
| 584 | addr16_lo(unsigned char* view, |
| 585 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 586 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 587 | { This_reloc::rela16(view, value, addend); } |
| 588 | |
| 589 | static inline void |
| 590 | addr16_lo(unsigned char* view, |
| 591 | const Sized_relobj<size, big_endian>* object, |
| 592 | const Symbol_value<size>* psymval, |
| 593 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 594 | { This_reloc::rela16(view, object, psymval, addend); } |
| 595 | |
| 596 | // R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff |
| 597 | static inline void |
| 598 | addr16_hi(unsigned char* view, |
| 599 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 600 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 601 | { |
| 602 | This::template rela<16>(view, 16, 0xffff, value, addend); |
| 603 | } |
| 604 | |
| 605 | static inline void |
| 606 | addr16_hi(unsigned char* view, |
| 607 | const Sized_relobj<size, big_endian>* object, |
| 608 | const Symbol_value<size>* psymval, |
| 609 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 610 | { |
| 611 | This::template rela<16>(view, 16, 0xffff, object, psymval, addend); |
| 612 | } |
| 613 | |
| 614 | // R_POWERPC_ADDR16_HA: Same as R_POWERPC_ADDR16_HI except that if the |
| 615 | // final value of the low 16 bits of the |
| 616 | // relocation is negative, add one. |
| 617 | static inline void |
| 618 | addr16_ha(unsigned char* view, |
| 619 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
| 620 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 621 | { |
| 622 | typename elfcpp::Elf_types<size>::Elf_Addr reloc; |
| 623 | |
| 624 | reloc = value + addend; |
| 625 | |
| 626 | if (reloc & 0x8000) |
| 627 | reloc += 0x10000; |
| 628 | reloc >>= 16; |
| 629 | |
| 630 | elfcpp::Swap<16, big_endian>::writeval(view, reloc); |
| 631 | } |
| 632 | |
| 633 | static inline void |
| 634 | addr16_ha(unsigned char* view, |
| 635 | const Sized_relobj<size, big_endian>* object, |
| 636 | const Symbol_value<size>* psymval, |
| 637 | typename elfcpp::Elf_types<size>::Elf_Addr addend) |
| 638 | { |
| 639 | typename elfcpp::Elf_types<size>::Elf_Addr reloc; |
| 640 | |
| 641 | reloc = psymval->value(object, addend); |
| 642 | |
| 643 | if (reloc & 0x8000) |
| 644 | reloc += 0x10000; |
| 645 | reloc >>= 16; |
| 646 | |
| 647 | elfcpp::Swap<16, big_endian>::writeval(view, reloc); |
| 648 | } |
| 649 | |
| 650 | // R_PPC_REL16: (Symbol + Addend - Address) & 0xffff |
| 651 | static inline void |
| 652 | rel16(unsigned char* view, |
| 653 | const Sized_relobj<size, big_endian>* object, |
| 654 | const Symbol_value<size>* psymval, |
| 655 | typename elfcpp::Elf_types<size>::Elf_Addr addend, |
| 656 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 657 | { This_reloc::pcrela16(view, object, psymval, addend, address); } |
| 658 | |
| 659 | // R_PPC_REL16_LO: (Symbol + Addend - Address) & 0xffff |
| 660 | static inline void |
| 661 | rel16_lo(unsigned char* view, |
| 662 | const Sized_relobj<size, big_endian>* object, |
| 663 | const Symbol_value<size>* psymval, |
| 664 | typename elfcpp::Elf_types<size>::Elf_Addr addend, |
| 665 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 666 | { This_reloc::pcrela16(view, object, psymval, addend, address); } |
| 667 | |
| 668 | // R_PPC_REL16_HI: ((Symbol + Addend - Address) >> 16) & 0xffff |
| 669 | static inline void |
| 670 | rel16_hi(unsigned char* view, |
| 671 | const Sized_relobj<size, big_endian>* object, |
| 672 | const Symbol_value<size>* psymval, |
| 673 | typename elfcpp::Elf_types<size>::Elf_Addr addend, |
| 674 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 675 | { |
| 676 | This::template pcrela<16>(view, 16, 0xffff, object, |
| 677 | psymval, addend, address); |
| 678 | } |
| 679 | |
| 680 | // R_PPC_REL16_HA: Same as R_PPC_REL16_HI except that if the |
| 681 | // final value of the low 16 bits of the |
| 682 | // relocation is negative, add one. |
| 683 | static inline void |
| 684 | rel16_ha(unsigned char* view, |
| 685 | const Sized_relobj<size, big_endian>* object, |
| 686 | const Symbol_value<size>* psymval, |
| 687 | typename elfcpp::Elf_types<size>::Elf_Addr addend, |
| 688 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 689 | { |
| 690 | typename elfcpp::Elf_types<size>::Elf_Addr reloc; |
| 691 | |
| 692 | reloc = (psymval->value(object, addend) - address); |
| 693 | if (reloc & 0x8000) |
| 694 | reloc += 0x10000; |
| 695 | reloc >>= 16; |
| 696 | |
| 697 | elfcpp::Swap<16, big_endian>::writeval(view, reloc); |
| 698 | } |
| 699 | }; |
| 700 | |
| 701 | // Get the GOT section, creating it if necessary. |
| 702 | |
| 703 | template<int size, bool big_endian> |
| 704 | Output_data_got<size, big_endian>* |
| 705 | Target_powerpc<size, big_endian>::got_section(Symbol_table* symtab, |
| 706 | Layout* layout) |
| 707 | { |
| 708 | if (this->got_ == NULL) |
| 709 | { |
| 710 | gold_assert(symtab != NULL && layout != NULL); |
| 711 | |
| 712 | this->got_ = new Output_data_got<size, big_endian>(); |
| 713 | |
| 714 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 715 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, |
| 716 | this->got_); |
| 717 | |
| 718 | // Create the GOT2 or TOC in the .got section. |
| 719 | if (size == 32) |
| 720 | { |
| 721 | this->got2_ = new Output_data_space(4, "** GOT2"); |
| 722 | layout->add_output_section_data(".got2", elfcpp::SHT_PROGBITS, |
| 723 | elfcpp::SHF_ALLOC |
| 724 | | elfcpp::SHF_WRITE, |
| 725 | this->got2_); |
| 726 | } |
| 727 | else |
| 728 | { |
| 729 | this->toc_ = new Output_data_space(8, "** TOC"); |
| 730 | layout->add_output_section_data(".toc", elfcpp::SHT_PROGBITS, |
| 731 | elfcpp::SHF_ALLOC |
| 732 | | elfcpp::SHF_WRITE, |
| 733 | this->toc_); |
| 734 | } |
| 735 | |
| 736 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section. |
| 737 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 738 | this->got_, |
| 739 | 0, 0, elfcpp::STT_OBJECT, |
| 740 | elfcpp::STB_LOCAL, |
| 741 | elfcpp::STV_HIDDEN, 0, |
| 742 | false, false); |
| 743 | } |
| 744 | |
| 745 | return this->got_; |
| 746 | } |
| 747 | |
| 748 | // Get the dynamic reloc section, creating it if necessary. |
| 749 | |
| 750 | template<int size, bool big_endian> |
| 751 | typename Target_powerpc<size, big_endian>::Reloc_section* |
| 752 | Target_powerpc<size, big_endian>::rela_dyn_section(Layout* layout) |
| 753 | { |
| 754 | if (this->rela_dyn_ == NULL) |
| 755 | { |
| 756 | gold_assert(layout != NULL); |
| 757 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| 758 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 759 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
| 760 | } |
| 761 | return this->rela_dyn_; |
| 762 | } |
| 763 | |
| 764 | // A class to handle the PLT data. |
| 765 | |
| 766 | template<int size, bool big_endian> |
| 767 | class Output_data_plt_powerpc : public Output_section_data |
| 768 | { |
| 769 | public: |
| 770 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, |
| 771 | size, big_endian> Reloc_section; |
| 772 | |
| 773 | Output_data_plt_powerpc(Layout*); |
| 774 | |
| 775 | // Add an entry to the PLT. |
| 776 | void add_entry(Symbol* gsym); |
| 777 | |
| 778 | // Return the .rela.plt section data. |
| 779 | const Reloc_section* rel_plt() const |
| 780 | { |
| 781 | return this->rel_; |
| 782 | } |
| 783 | |
| 784 | protected: |
| 785 | void do_adjust_output_section(Output_section* os); |
| 786 | |
| 787 | private: |
| 788 | // The size of an entry in the PLT. |
| 789 | static const int base_plt_entry_size = (size == 32 ? 16 : 24); |
| 790 | |
| 791 | // Set the final size. |
| 792 | void |
| 793 | set_final_data_size() |
| 794 | { |
| 795 | unsigned int full_count = this->count_ + 4; |
| 796 | |
| 797 | this->set_data_size(full_count * base_plt_entry_size); |
| 798 | } |
| 799 | |
| 800 | // Write out the PLT data. |
| 801 | void |
| 802 | do_write(Output_file*); |
| 803 | |
| 804 | // The reloc section. |
| 805 | Reloc_section* rel_; |
| 806 | // The number of PLT entries. |
| 807 | unsigned int count_; |
| 808 | }; |
| 809 | |
| 810 | // Create the PLT section. The ordinary .got section is an argument, |
| 811 | // since we need to refer to the start. |
| 812 | |
| 813 | template<int size, bool big_endian> |
| 814 | Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(Layout* layout) |
| 815 | : Output_section_data(size == 32 ? 4 : 8), count_(0) |
| 816 | { |
| 817 | this->rel_ = new Reloc_section(false); |
| 818 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 819 | elfcpp::SHF_ALLOC, this->rel_); |
| 820 | } |
| 821 | |
| 822 | template<int size, bool big_endian> |
| 823 | void |
| 824 | Output_data_plt_powerpc<size, big_endian>::do_adjust_output_section(Output_section* os) |
| 825 | { |
| 826 | os->set_entsize(0); |
| 827 | } |
| 828 | |
| 829 | // Add an entry to the PLT. |
| 830 | |
| 831 | template<int size, bool big_endian> |
| 832 | void |
| 833 | Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym) |
| 834 | { |
| 835 | gold_assert(!gsym->has_plt_offset()); |
| 836 | unsigned int index = this->count_+ + 4; |
| 837 | section_offset_type plt_offset; |
| 838 | |
| 839 | if (index < 8192) |
| 840 | plt_offset = index * base_plt_entry_size; |
| 841 | else |
| 842 | gold_unreachable(); |
| 843 | |
| 844 | gsym->set_plt_offset(plt_offset); |
| 845 | |
| 846 | ++this->count_; |
| 847 | |
| 848 | gsym->set_needs_dynsym_entry(); |
| 849 | this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this, |
| 850 | plt_offset, 0); |
| 851 | } |
| 852 | |
| 853 | static const unsigned int addis_11_11 = 0x3d6b0000; |
| 854 | static const unsigned int addis_11_30 = 0x3d7e0000; |
| 855 | static const unsigned int addis_12_12 = 0x3d8c0000; |
| 856 | static const unsigned int addi_11_11 = 0x396b0000; |
| 857 | static const unsigned int add_0_11_11 = 0x7c0b5a14; |
| 858 | static const unsigned int add_11_0_11 = 0x7d605a14; |
| 859 | static const unsigned int b = 0x48000000; |
| 860 | static const unsigned int bcl_20_31 = 0x429f0005; |
| 861 | static const unsigned int bctr = 0x4e800420; |
| 862 | static const unsigned int lis_11 = 0x3d600000; |
| 863 | static const unsigned int lis_12 = 0x3d800000; |
| 864 | static const unsigned int lwzu_0_12 = 0x840c0000; |
| 865 | static const unsigned int lwz_0_12 = 0x800c0000; |
| 866 | static const unsigned int lwz_11_11 = 0x816b0000; |
| 867 | static const unsigned int lwz_11_30 = 0x817e0000; |
| 868 | static const unsigned int lwz_12_12 = 0x818c0000; |
| 869 | static const unsigned int mflr_0 = 0x7c0802a6; |
| 870 | static const unsigned int mflr_12 = 0x7d8802a6; |
| 871 | static const unsigned int mtctr_0 = 0x7c0903a6; |
| 872 | static const unsigned int mtctr_11 = 0x7d6903a6; |
| 873 | static const unsigned int mtlr_0 = 0x7c0803a6; |
| 874 | static const unsigned int nop = 0x60000000; |
| 875 | static const unsigned int sub_11_11_12 = 0x7d6c5850; |
| 876 | |
| 877 | static const unsigned int addis_r12_r2 = 0x3d820000; /* addis %r12,%r2,xxx@ha */ |
| 878 | static const unsigned int std_r2_40r1 = 0xf8410028; /* std %r2,40(%r1) */ |
| 879 | static const unsigned int ld_r11_0r12 = 0xe96c0000; /* ld %r11,xxx+0@l(%r12) */ |
| 880 | static const unsigned int ld_r2_0r12 = 0xe84c0000; /* ld %r2,xxx+8@l(%r12) */ |
| 881 | /* ld %r11,xxx+16@l(%r12) */ |
| 882 | |
| 883 | |
| 884 | // Write out the PLT. |
| 885 | |
| 886 | template<int size, bool big_endian> |
| 887 | void |
| 888 | Output_data_plt_powerpc<size, big_endian>::do_write(Output_file* of) |
| 889 | { |
| 890 | const off_t offset = this->offset(); |
| 891 | const section_size_type oview_size = |
| 892 | convert_to_section_size_type(this->data_size()); |
| 893 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 894 | unsigned char* pov = oview; |
| 895 | |
| 896 | memset(pov, 0, base_plt_entry_size * 4); |
| 897 | pov += base_plt_entry_size * 4; |
| 898 | |
| 899 | unsigned int plt_offset = base_plt_entry_size * 4; |
| 900 | const unsigned int count = this->count_; |
| 901 | |
| 902 | if (size == 64) |
| 903 | { |
| 904 | for (unsigned int i = 0; i < count; i++) |
| 905 | { |
| 906 | } |
| 907 | } |
| 908 | else |
| 909 | { |
| 910 | for (unsigned int i = 0; i < count; i++) |
| 911 | { |
| 912 | elfcpp::Swap<32, true>::writeval(pov + 0x00, |
| 913 | lwz_11_30 + plt_offset); |
| 914 | elfcpp::Swap<32, true>::writeval(pov + 0x04, mtctr_11); |
| 915 | elfcpp::Swap<32, true>::writeval(pov + 0x08, bctr); |
| 916 | elfcpp::Swap<32, true>::writeval(pov + 0x0c, nop); |
| 917 | pov += base_plt_entry_size; |
| 918 | plt_offset += base_plt_entry_size; |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
| 923 | |
| 924 | of->write_output_view(offset, oview_size, oview); |
| 925 | } |
| 926 | |
| 927 | // Create a PLT entry for a global symbol. |
| 928 | |
| 929 | template<int size, bool big_endian> |
| 930 | void |
| 931 | Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab, |
| 932 | Layout* layout, |
| 933 | Symbol* gsym) |
| 934 | { |
| 935 | if (gsym->has_plt_offset()) |
| 936 | return; |
| 937 | |
| 938 | if (this->plt_ == NULL) |
| 939 | { |
| 940 | // Create the GOT section first. |
| 941 | this->got_section(symtab, layout); |
| 942 | |
| 943 | this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout); |
| 944 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
| 945 | (elfcpp::SHF_ALLOC |
| 946 | | elfcpp::SHF_EXECINSTR |
| 947 | | elfcpp::SHF_WRITE), |
| 948 | this->plt_); |
| 949 | |
| 950 | // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section. |
| 951 | symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL, |
| 952 | this->plt_, |
| 953 | 0, 0, elfcpp::STT_OBJECT, |
| 954 | elfcpp::STB_LOCAL, |
| 955 | elfcpp::STV_HIDDEN, 0, |
| 956 | false, false); |
| 957 | } |
| 958 | |
| 959 | this->plt_->add_entry(gsym); |
| 960 | } |
| 961 | |
| 962 | // Create a GOT entry for the TLS module index. |
| 963 | |
| 964 | template<int size, bool big_endian> |
| 965 | unsigned int |
| 966 | Target_powerpc<size, big_endian>::got_mod_index_entry(Symbol_table* symtab, |
| 967 | Layout* layout, |
| 968 | Sized_relobj<size, big_endian>* object) |
| 969 | { |
| 970 | if (this->got_mod_index_offset_ == -1U) |
| 971 | { |
| 972 | gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| 973 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| 974 | Output_data_got<size, big_endian>* got; |
| 975 | unsigned int got_offset; |
| 976 | |
| 977 | got = this->got_section(symtab, layout); |
| 978 | got_offset = got->add_constant(0); |
| 979 | rela_dyn->add_local(object, 0, elfcpp::R_POWERPC_DTPMOD, got, |
| 980 | got_offset, 0); |
| 981 | got->add_constant(0); |
| 982 | this->got_mod_index_offset_ = got_offset; |
| 983 | } |
| 984 | return this->got_mod_index_offset_; |
| 985 | } |
| 986 | |
| 987 | // Optimize the TLS relocation type based on what we know about the |
| 988 | // symbol. IS_FINAL is true if the final address of this symbol is |
| 989 | // known at link time. |
| 990 | |
| 991 | static tls::Tls_optimization |
| 992 | optimize_tls_reloc(bool /* is_final */, int r_type) |
| 993 | { |
| 994 | // If we are generating a shared library, then we can't do anything |
| 995 | // in the linker. |
| 996 | if (parameters->options().shared()) |
| 997 | return tls::TLSOPT_NONE; |
| 998 | switch (r_type) |
| 999 | { |
| 1000 | // XXX |
| 1001 | default: |
| 1002 | gold_unreachable(); |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | // Report an unsupported relocation against a local symbol. |
| 1007 | |
| 1008 | template<int size, bool big_endian> |
| 1009 | void |
| 1010 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_local( |
| 1011 | Sized_relobj<size, big_endian>* object, |
| 1012 | unsigned int r_type) |
| 1013 | { |
| 1014 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 1015 | object->name().c_str(), r_type); |
| 1016 | } |
| 1017 | |
| 1018 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
| 1019 | // dynamic linker does not support it, issue an error. |
| 1020 | |
| 1021 | template<int size, bool big_endian> |
| 1022 | void |
| 1023 | Target_powerpc<size, big_endian>::Scan::check_non_pic(Relobj* object, |
| 1024 | unsigned int r_type) |
| 1025 | { |
| 1026 | gold_assert(r_type != elfcpp::R_POWERPC_NONE); |
| 1027 | |
| 1028 | // These are the relocation types supported by glibc for both 32-bit |
| 1029 | // and 64-bit powerpc. |
| 1030 | switch (r_type) |
| 1031 | { |
| 1032 | case elfcpp::R_POWERPC_RELATIVE: |
| 1033 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 1034 | case elfcpp::R_POWERPC_DTPMOD: |
| 1035 | case elfcpp::R_POWERPC_DTPREL: |
| 1036 | case elfcpp::R_POWERPC_TPREL: |
| 1037 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 1038 | case elfcpp::R_POWERPC_COPY: |
| 1039 | case elfcpp::R_POWERPC_ADDR32: |
| 1040 | case elfcpp::R_POWERPC_ADDR24: |
| 1041 | case elfcpp::R_POWERPC_REL24: |
| 1042 | return; |
| 1043 | |
| 1044 | default: |
| 1045 | break; |
| 1046 | } |
| 1047 | |
| 1048 | if (size == 64) |
| 1049 | { |
| 1050 | switch (r_type) |
| 1051 | { |
| 1052 | // These are the relocation types supported only on 64-bit. |
| 1053 | case elfcpp::R_PPC64_ADDR64: |
| 1054 | case elfcpp::R_PPC64_TPREL16_LO_DS: |
| 1055 | case elfcpp::R_PPC64_TPREL16_DS: |
| 1056 | case elfcpp::R_POWERPC_TPREL16: |
| 1057 | case elfcpp::R_POWERPC_TPREL16_LO: |
| 1058 | case elfcpp::R_POWERPC_TPREL16_HI: |
| 1059 | case elfcpp::R_POWERPC_TPREL16_HA: |
| 1060 | case elfcpp::R_PPC64_TPREL16_HIGHER: |
| 1061 | case elfcpp::R_PPC64_TPREL16_HIGHEST: |
| 1062 | case elfcpp::R_PPC64_TPREL16_HIGHERA: |
| 1063 | case elfcpp::R_PPC64_TPREL16_HIGHESTA: |
| 1064 | case elfcpp::R_PPC64_ADDR16_LO_DS: |
| 1065 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 1066 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 1067 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 1068 | case elfcpp::R_POWERPC_ADDR30: |
| 1069 | case elfcpp::R_PPC64_UADDR64: |
| 1070 | case elfcpp::R_POWERPC_UADDR32: |
| 1071 | case elfcpp::R_POWERPC_ADDR16: |
| 1072 | case elfcpp::R_POWERPC_UADDR16: |
| 1073 | case elfcpp::R_PPC64_ADDR16_DS: |
| 1074 | case elfcpp::R_PPC64_ADDR16_HIGHER: |
| 1075 | case elfcpp::R_PPC64_ADDR16_HIGHEST: |
| 1076 | case elfcpp::R_PPC64_ADDR16_HIGHERA: |
| 1077 | case elfcpp::R_PPC64_ADDR16_HIGHESTA: |
| 1078 | case elfcpp::R_POWERPC_ADDR14_BRTAKEN: |
| 1079 | case elfcpp::R_POWERPC_ADDR14_BRNTAKEN: |
| 1080 | case elfcpp::R_POWERPC_REL32: |
| 1081 | case elfcpp::R_PPC64_REL64: |
| 1082 | return; |
| 1083 | |
| 1084 | default: |
| 1085 | break; |
| 1086 | } |
| 1087 | } |
| 1088 | else |
| 1089 | { |
| 1090 | switch (r_type) |
| 1091 | { |
| 1092 | // These are the relocation types supported only on 32-bit. |
| 1093 | |
| 1094 | default: |
| 1095 | break; |
| 1096 | } |
| 1097 | } |
| 1098 | |
| 1099 | // This prevents us from issuing more than one error per reloc |
| 1100 | // section. But we can still wind up issuing more than one |
| 1101 | // error per object file. |
| 1102 | if (this->issued_non_pic_error_) |
| 1103 | return; |
| 1104 | gold_assert(parameters->options().output_is_position_independent()); |
| 1105 | object->error(_("requires unsupported dynamic reloc; " |
| 1106 | "recompile with -fPIC")); |
| 1107 | this->issued_non_pic_error_ = true; |
| 1108 | return; |
| 1109 | } |
| 1110 | |
| 1111 | // Scan a relocation for a local symbol. |
| 1112 | |
| 1113 | template<int size, bool big_endian> |
| 1114 | inline void |
| 1115 | Target_powerpc<size, big_endian>::Scan::local( |
| 1116 | const General_options&, |
| 1117 | Symbol_table* symtab, |
| 1118 | Layout* layout, |
| 1119 | Target_powerpc<size, big_endian>* target, |
| 1120 | Sized_relobj<size, big_endian>* object, |
| 1121 | unsigned int data_shndx, |
| 1122 | Output_section* output_section, |
| 1123 | const elfcpp::Rela<size, big_endian>& reloc, |
| 1124 | unsigned int r_type, |
| 1125 | const elfcpp::Sym<size, big_endian>& lsym) |
| 1126 | { |
| 1127 | switch (r_type) |
| 1128 | { |
| 1129 | case elfcpp::R_POWERPC_NONE: |
| 1130 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 1131 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 1132 | break; |
| 1133 | |
| 1134 | case elfcpp::R_PPC64_ADDR64: |
| 1135 | case elfcpp::R_POWERPC_ADDR32: |
| 1136 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 1137 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 1138 | // If building a shared library (or a position-independent |
| 1139 | // executable), we need to create a dynamic relocation for |
| 1140 | // this location. |
| 1141 | if (parameters->options().output_is_position_independent()) |
| 1142 | { |
| 1143 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 1144 | |
| 1145 | check_non_pic(object, r_type); |
| 1146 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
| 1147 | { |
| 1148 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 1149 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
| 1150 | data_shndx, reloc.get_r_offset(), |
| 1151 | reloc.get_r_addend()); |
| 1152 | } |
| 1153 | else |
| 1154 | { |
| 1155 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 1156 | gold_assert(lsym.get_st_value() == 0); |
| 1157 | rela_dyn->add_local_relative(object, r_sym, r_type, |
| 1158 | output_section, data_shndx, |
| 1159 | reloc.get_r_offset(), |
| 1160 | reloc.get_r_addend()); |
| 1161 | } |
| 1162 | } |
| 1163 | break; |
| 1164 | |
| 1165 | case elfcpp::R_POWERPC_REL24: |
| 1166 | case elfcpp::R_PPC_LOCAL24PC: |
| 1167 | case elfcpp::R_POWERPC_REL32: |
| 1168 | case elfcpp::R_PPC_REL16_LO: |
| 1169 | case elfcpp::R_PPC_REL16_HA: |
| 1170 | break; |
| 1171 | |
| 1172 | case elfcpp::R_POWERPC_GOT16: |
| 1173 | case elfcpp::R_POWERPC_GOT16_LO: |
| 1174 | case elfcpp::R_POWERPC_GOT16_HI: |
| 1175 | case elfcpp::R_POWERPC_GOT16_HA: |
| 1176 | case elfcpp::R_PPC64_TOC16: |
| 1177 | case elfcpp::R_PPC64_TOC16_LO: |
| 1178 | case elfcpp::R_PPC64_TOC16_HI: |
| 1179 | case elfcpp::R_PPC64_TOC16_HA: |
| 1180 | case elfcpp::R_PPC64_TOC16_DS: |
| 1181 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 1182 | { |
| 1183 | // The symbol requires a GOT entry. |
| 1184 | Output_data_got<size, big_endian>* got; |
| 1185 | unsigned int r_sym; |
| 1186 | |
| 1187 | got = target->got_section(symtab, layout); |
| 1188 | r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
| 1189 | |
| 1190 | // If we are generating a shared object, we need to add a |
| 1191 | // dynamic relocation for this symbol's GOT entry. |
| 1192 | if (parameters->options().output_is_position_independent()) |
| 1193 | { |
| 1194 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)) |
| 1195 | { |
| 1196 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 1197 | unsigned int off; |
| 1198 | |
| 1199 | off = got->add_constant(0); |
| 1200 | object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off); |
| 1201 | rela_dyn->add_local_relative(object, r_sym, |
| 1202 | elfcpp::R_POWERPC_RELATIVE, |
| 1203 | got, off, 0); |
| 1204 | } |
| 1205 | } |
| 1206 | else |
| 1207 | got->add_local(object, r_sym, GOT_TYPE_STANDARD); |
| 1208 | } |
| 1209 | break; |
| 1210 | |
| 1211 | case elfcpp::R_PPC64_TOC: |
| 1212 | // We need a GOT section. |
| 1213 | target->got_section(symtab, layout); |
| 1214 | break; |
| 1215 | |
| 1216 | // These are relocations which should only be seen by the |
| 1217 | // dynamic linker, and should never be seen here. |
| 1218 | case elfcpp::R_POWERPC_COPY: |
| 1219 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 1220 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 1221 | case elfcpp::R_POWERPC_RELATIVE: |
| 1222 | case elfcpp::R_POWERPC_DTPMOD: |
| 1223 | gold_error(_("%s: unexpected reloc %u in object file"), |
| 1224 | object->name().c_str(), r_type); |
| 1225 | break; |
| 1226 | |
| 1227 | default: |
| 1228 | unsupported_reloc_local(object, r_type); |
| 1229 | break; |
| 1230 | } |
| 1231 | } |
| 1232 | |
| 1233 | // Report an unsupported relocation against a global symbol. |
| 1234 | |
| 1235 | template<int size, bool big_endian> |
| 1236 | void |
| 1237 | Target_powerpc<size, big_endian>::Scan::unsupported_reloc_global( |
| 1238 | Sized_relobj<size, big_endian>* object, |
| 1239 | unsigned int r_type, |
| 1240 | Symbol* gsym) |
| 1241 | { |
| 1242 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 1243 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| 1244 | } |
| 1245 | |
| 1246 | // Scan a relocation for a global symbol. |
| 1247 | |
| 1248 | template<int size, bool big_endian> |
| 1249 | inline void |
| 1250 | Target_powerpc<size, big_endian>::Scan::global( |
| 1251 | const General_options&, |
| 1252 | Symbol_table* symtab, |
| 1253 | Layout* layout, |
| 1254 | Target_powerpc<size, big_endian>* target, |
| 1255 | Sized_relobj<size, big_endian>* object, |
| 1256 | unsigned int data_shndx, |
| 1257 | Output_section* output_section, |
| 1258 | const elfcpp::Rela<size, big_endian>& reloc, |
| 1259 | unsigned int r_type, |
| 1260 | Symbol* gsym) |
| 1261 | { |
| 1262 | switch (r_type) |
| 1263 | { |
| 1264 | case elfcpp::R_POWERPC_NONE: |
| 1265 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 1266 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 1267 | break; |
| 1268 | |
| 1269 | case elfcpp::R_PPC_PLTREL24: |
| 1270 | // If the symbol is fully resolved, this is just a PC32 reloc. |
| 1271 | // Otherwise we need a PLT entry. |
| 1272 | if (gsym->final_value_is_known()) |
| 1273 | break; |
| 1274 | // If building a shared library, we can also skip the PLT entry |
| 1275 | // if the symbol is defined in the output file and is protected |
| 1276 | // or hidden. |
| 1277 | if (gsym->is_defined() |
| 1278 | && !gsym->is_from_dynobj() |
| 1279 | && !gsym->is_preemptible()) |
| 1280 | break; |
| 1281 | target->make_plt_entry(symtab, layout, gsym); |
| 1282 | break; |
| 1283 | |
| 1284 | case elfcpp::R_POWERPC_ADDR16: |
| 1285 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 1286 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 1287 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 1288 | case elfcpp::R_POWERPC_ADDR32: |
| 1289 | case elfcpp::R_PPC64_ADDR64: |
| 1290 | { |
| 1291 | // Make a PLT entry if necessary. |
| 1292 | if (gsym->needs_plt_entry()) |
| 1293 | { |
| 1294 | target->make_plt_entry(symtab, layout, gsym); |
| 1295 | // Since this is not a PC-relative relocation, we may be |
| 1296 | // taking the address of a function. In that case we need to |
| 1297 | // set the entry in the dynamic symbol table to the address of |
| 1298 | // the PLT entry. |
| 1299 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
| 1300 | gsym->set_needs_dynsym_value(); |
| 1301 | } |
| 1302 | // Make a dynamic relocation if necessary. |
| 1303 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
| 1304 | { |
| 1305 | if (gsym->may_need_copy_reloc()) |
| 1306 | { |
| 1307 | target->copy_reloc(symtab, layout, object, |
| 1308 | data_shndx, output_section, gsym, reloc); |
| 1309 | } |
| 1310 | else if ((r_type == elfcpp::R_POWERPC_ADDR32 |
| 1311 | || r_type == elfcpp::R_PPC64_ADDR64) |
| 1312 | && gsym->can_use_relative_reloc(false)) |
| 1313 | { |
| 1314 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 1315 | rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE, |
| 1316 | output_section, object, |
| 1317 | data_shndx, reloc.get_r_offset(), |
| 1318 | reloc.get_r_addend()); |
| 1319 | } |
| 1320 | else |
| 1321 | { |
| 1322 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 1323 | |
| 1324 | check_non_pic(object, r_type); |
| 1325 | if (gsym->is_from_dynobj() |
| 1326 | || gsym->is_undefined() |
| 1327 | || gsym->is_preemptible()) |
| 1328 | rela_dyn->add_global(gsym, r_type, output_section, |
| 1329 | object, data_shndx, |
| 1330 | reloc.get_r_offset(), |
| 1331 | reloc.get_r_addend()); |
| 1332 | else |
| 1333 | rela_dyn->add_global_relative(gsym, r_type, |
| 1334 | output_section, object, |
| 1335 | data_shndx, |
| 1336 | reloc.get_r_offset(), |
| 1337 | reloc.get_r_addend()); |
| 1338 | } |
| 1339 | } |
| 1340 | } |
| 1341 | break; |
| 1342 | |
| 1343 | case elfcpp::R_POWERPC_REL24: |
| 1344 | case elfcpp::R_PPC_LOCAL24PC: |
| 1345 | case elfcpp::R_PPC_REL16: |
| 1346 | case elfcpp::R_PPC_REL16_LO: |
| 1347 | case elfcpp::R_PPC_REL16_HI: |
| 1348 | case elfcpp::R_PPC_REL16_HA: |
| 1349 | { |
| 1350 | if (gsym->needs_plt_entry()) |
| 1351 | target->make_plt_entry(symtab, layout, gsym); |
| 1352 | // Make a dynamic relocation if necessary. |
| 1353 | int flags = Symbol::NON_PIC_REF; |
| 1354 | if (gsym->type() == elfcpp::STT_FUNC) |
| 1355 | flags |= Symbol::FUNCTION_CALL; |
| 1356 | if (gsym->needs_dynamic_reloc(flags)) |
| 1357 | { |
| 1358 | if (gsym->may_need_copy_reloc()) |
| 1359 | { |
| 1360 | target->copy_reloc(symtab, layout, object, |
| 1361 | data_shndx, output_section, gsym, |
| 1362 | reloc); |
| 1363 | } |
| 1364 | else |
| 1365 | { |
| 1366 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 1367 | check_non_pic(object, r_type); |
| 1368 | rela_dyn->add_global(gsym, r_type, output_section, object, |
| 1369 | data_shndx, reloc.get_r_offset(), |
| 1370 | reloc.get_r_addend()); |
| 1371 | } |
| 1372 | } |
| 1373 | } |
| 1374 | break; |
| 1375 | |
| 1376 | case elfcpp::R_POWERPC_GOT16: |
| 1377 | case elfcpp::R_POWERPC_GOT16_LO: |
| 1378 | case elfcpp::R_POWERPC_GOT16_HI: |
| 1379 | case elfcpp::R_POWERPC_GOT16_HA: |
| 1380 | case elfcpp::R_PPC64_TOC16: |
| 1381 | case elfcpp::R_PPC64_TOC16_LO: |
| 1382 | case elfcpp::R_PPC64_TOC16_HI: |
| 1383 | case elfcpp::R_PPC64_TOC16_HA: |
| 1384 | case elfcpp::R_PPC64_TOC16_DS: |
| 1385 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 1386 | { |
| 1387 | // The symbol requires a GOT entry. |
| 1388 | Output_data_got<size, big_endian>* got; |
| 1389 | |
| 1390 | got = target->got_section(symtab, layout); |
| 1391 | if (gsym->final_value_is_known()) |
| 1392 | got->add_global(gsym, GOT_TYPE_STANDARD); |
| 1393 | else |
| 1394 | { |
| 1395 | // If this symbol is not fully resolved, we need to add a |
| 1396 | // dynamic relocation for it. |
| 1397 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 1398 | if (gsym->is_from_dynobj() |
| 1399 | || gsym->is_undefined() |
| 1400 | || gsym->is_preemptible()) |
| 1401 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
| 1402 | elfcpp::R_POWERPC_GLOB_DAT); |
| 1403 | else if (!gsym->has_got_offset(GOT_TYPE_STANDARD)) |
| 1404 | { |
| 1405 | unsigned int off = got->add_constant(0); |
| 1406 | |
| 1407 | gsym->set_got_offset(GOT_TYPE_STANDARD, off); |
| 1408 | rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE, |
| 1409 | got, off, 0); |
| 1410 | } |
| 1411 | } |
| 1412 | } |
| 1413 | break; |
| 1414 | |
| 1415 | case elfcpp::R_PPC64_TOC: |
| 1416 | // We need a GOT section. |
| 1417 | target->got_section(symtab, layout); |
| 1418 | break; |
| 1419 | |
| 1420 | case elfcpp::R_POWERPC_GOT_TPREL16: |
| 1421 | case elfcpp::R_POWERPC_TLS: |
| 1422 | // XXX TLS |
| 1423 | break; |
| 1424 | |
| 1425 | // These are relocations which should only be seen by the |
| 1426 | // dynamic linker, and should never be seen here. |
| 1427 | case elfcpp::R_POWERPC_COPY: |
| 1428 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 1429 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 1430 | case elfcpp::R_POWERPC_RELATIVE: |
| 1431 | case elfcpp::R_POWERPC_DTPMOD: |
| 1432 | gold_error(_("%s: unexpected reloc %u in object file"), |
| 1433 | object->name().c_str(), r_type); |
| 1434 | break; |
| 1435 | |
| 1436 | default: |
| 1437 | unsupported_reloc_global(object, r_type, gsym); |
| 1438 | break; |
| 1439 | } |
| 1440 | } |
| 1441 | |
| 1442 | // Process relocations for gc. |
| 1443 | |
| 1444 | template<int size, bool big_endian> |
| 1445 | void |
| 1446 | Target_powerpc<size, big_endian>::gc_process_relocs( |
| 1447 | const General_options& options, |
| 1448 | Symbol_table* symtab, |
| 1449 | Layout* layout, |
| 1450 | Sized_relobj<size, big_endian>* object, |
| 1451 | unsigned int data_shndx, |
| 1452 | unsigned int, |
| 1453 | const unsigned char* prelocs, |
| 1454 | size_t reloc_count, |
| 1455 | Output_section* output_section, |
| 1456 | bool needs_special_offset_handling, |
| 1457 | size_t local_symbol_count, |
| 1458 | const unsigned char* plocal_symbols) |
| 1459 | { |
| 1460 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 1461 | typedef typename Target_powerpc<size, big_endian>::Scan Scan; |
| 1462 | |
| 1463 | gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>( |
| 1464 | options, |
| 1465 | symtab, |
| 1466 | layout, |
| 1467 | this, |
| 1468 | object, |
| 1469 | data_shndx, |
| 1470 | prelocs, |
| 1471 | reloc_count, |
| 1472 | output_section, |
| 1473 | needs_special_offset_handling, |
| 1474 | local_symbol_count, |
| 1475 | plocal_symbols); |
| 1476 | } |
| 1477 | |
| 1478 | // Scan relocations for a section. |
| 1479 | |
| 1480 | template<int size, bool big_endian> |
| 1481 | void |
| 1482 | Target_powerpc<size, big_endian>::scan_relocs( |
| 1483 | const General_options& options, |
| 1484 | Symbol_table* symtab, |
| 1485 | Layout* layout, |
| 1486 | Sized_relobj<size, big_endian>* object, |
| 1487 | unsigned int data_shndx, |
| 1488 | unsigned int sh_type, |
| 1489 | const unsigned char* prelocs, |
| 1490 | size_t reloc_count, |
| 1491 | Output_section* output_section, |
| 1492 | bool needs_special_offset_handling, |
| 1493 | size_t local_symbol_count, |
| 1494 | const unsigned char* plocal_symbols) |
| 1495 | { |
| 1496 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 1497 | typedef typename Target_powerpc<size, big_endian>::Scan Scan; |
| 1498 | static Output_data_space* sdata; |
| 1499 | |
| 1500 | if (sh_type == elfcpp::SHT_REL) |
| 1501 | { |
| 1502 | gold_error(_("%s: unsupported REL reloc section"), |
| 1503 | object->name().c_str()); |
| 1504 | return; |
| 1505 | } |
| 1506 | |
| 1507 | // Define _SDA_BASE_ at the start of the .sdata section. |
| 1508 | if (sdata == NULL) |
| 1509 | { |
| 1510 | // layout->find_output_section(".sdata") == NULL |
| 1511 | sdata = new Output_data_space(4, "** sdata"); |
| 1512 | Output_section* os = layout->add_output_section_data(".sdata", 0, |
| 1513 | elfcpp::SHF_ALLOC |
| 1514 | | elfcpp::SHF_WRITE, |
| 1515 | sdata); |
| 1516 | symtab->define_in_output_data("_SDA_BASE_", NULL, |
| 1517 | os, |
| 1518 | 32768, 0, |
| 1519 | elfcpp::STT_OBJECT, |
| 1520 | elfcpp::STB_LOCAL, |
| 1521 | elfcpp::STV_HIDDEN, 0, |
| 1522 | false, false); |
| 1523 | } |
| 1524 | |
| 1525 | gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>( |
| 1526 | options, |
| 1527 | symtab, |
| 1528 | layout, |
| 1529 | this, |
| 1530 | object, |
| 1531 | data_shndx, |
| 1532 | prelocs, |
| 1533 | reloc_count, |
| 1534 | output_section, |
| 1535 | needs_special_offset_handling, |
| 1536 | local_symbol_count, |
| 1537 | plocal_symbols); |
| 1538 | } |
| 1539 | |
| 1540 | // Finalize the sections. |
| 1541 | |
| 1542 | template<int size, bool big_endian> |
| 1543 | void |
| 1544 | Target_powerpc<size, big_endian>::do_finalize_sections(Layout* layout) |
| 1545 | { |
| 1546 | // Fill in some more dynamic tags. |
| 1547 | Output_data_dynamic* const odyn = layout->dynamic_data(); |
| 1548 | if (odyn != NULL) |
| 1549 | { |
| 1550 | if (this->plt_ != NULL) |
| 1551 | { |
| 1552 | const Output_data* od = this->plt_->rel_plt(); |
| 1553 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); |
| 1554 | odyn->add_section_address(elfcpp::DT_JMPREL, od); |
| 1555 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); |
| 1556 | |
| 1557 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->plt_); |
| 1558 | } |
| 1559 | |
| 1560 | if (this->rela_dyn_ != NULL) |
| 1561 | { |
| 1562 | const Output_data* od = this->rela_dyn_; |
| 1563 | odyn->add_section_address(elfcpp::DT_RELA, od); |
| 1564 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
| 1565 | odyn->add_constant(elfcpp::DT_RELAENT, |
| 1566 | elfcpp::Elf_sizes<size>::rela_size); |
| 1567 | } |
| 1568 | |
| 1569 | if (!parameters->options().shared()) |
| 1570 | { |
| 1571 | // The value of the DT_DEBUG tag is filled in by the dynamic |
| 1572 | // linker at run time, and used by the debugger. |
| 1573 | odyn->add_constant(elfcpp::DT_DEBUG, 0); |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | // Emit any relocs we saved in an attempt to avoid generating COPY |
| 1578 | // relocs. |
| 1579 | if (this->copy_relocs_.any_saved_relocs()) |
| 1580 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); |
| 1581 | } |
| 1582 | |
| 1583 | // Perform a relocation. |
| 1584 | |
| 1585 | template<int size, bool big_endian> |
| 1586 | inline bool |
| 1587 | Target_powerpc<size, big_endian>::Relocate::relocate( |
| 1588 | const Relocate_info<size, big_endian>* relinfo, |
| 1589 | Target_powerpc* target, |
| 1590 | Output_section*, |
| 1591 | size_t relnum, |
| 1592 | const elfcpp::Rela<size, big_endian>& rela, |
| 1593 | unsigned int r_type, |
| 1594 | const Sized_symbol<size>* gsym, |
| 1595 | const Symbol_value<size>* psymval, |
| 1596 | unsigned char* view, |
| 1597 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 1598 | section_size_type /* view_size */) |
| 1599 | { |
| 1600 | const unsigned int toc_base_offset = 0x8000; |
| 1601 | typedef Powerpc_relocate_functions<size, big_endian> Reloc; |
| 1602 | |
| 1603 | // Pick the value to use for symbols defined in shared objects. |
| 1604 | Symbol_value<size> symval; |
| 1605 | if (gsym != NULL |
| 1606 | && gsym->use_plt_offset(r_type == elfcpp::R_POWERPC_REL24 |
| 1607 | || r_type == elfcpp::R_PPC_LOCAL24PC |
| 1608 | || r_type == elfcpp::R_PPC_REL16 |
| 1609 | || r_type == elfcpp::R_PPC_REL16_LO |
| 1610 | || r_type == elfcpp::R_PPC_REL16_HI |
| 1611 | || r_type == elfcpp::R_PPC_REL16_HA)) |
| 1612 | { |
| 1613 | elfcpp::Elf_Xword value; |
| 1614 | |
| 1615 | value = target->plt_section()->address() + gsym->plt_offset(); |
| 1616 | |
| 1617 | symval.set_output_value(value); |
| 1618 | |
| 1619 | psymval = &symval; |
| 1620 | } |
| 1621 | |
| 1622 | const Sized_relobj<size, big_endian>* object = relinfo->object; |
| 1623 | elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 1624 | |
| 1625 | // Get the GOT offset if needed. Unlike i386 and x86_64, our GOT |
| 1626 | // pointer points to the beginning, not the end, of the table. |
| 1627 | // So we just use the plain offset. |
| 1628 | bool have_got_offset = false; |
| 1629 | unsigned int got_offset = 0; |
| 1630 | unsigned int got2_offset = 0; |
| 1631 | switch (r_type) |
| 1632 | { |
| 1633 | case elfcpp::R_PPC64_TOC16: |
| 1634 | case elfcpp::R_PPC64_TOC16_LO: |
| 1635 | case elfcpp::R_PPC64_TOC16_HI: |
| 1636 | case elfcpp::R_PPC64_TOC16_HA: |
| 1637 | case elfcpp::R_PPC64_TOC16_DS: |
| 1638 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 1639 | // Subtract the TOC base address. |
| 1640 | addend -= target->toc_section()->address() + toc_base_offset; |
| 1641 | /* FALLTHRU */ |
| 1642 | |
| 1643 | case elfcpp::R_POWERPC_GOT16: |
| 1644 | case elfcpp::R_POWERPC_GOT16_LO: |
| 1645 | case elfcpp::R_POWERPC_GOT16_HI: |
| 1646 | case elfcpp::R_POWERPC_GOT16_HA: |
| 1647 | case elfcpp::R_PPC64_GOT16_DS: |
| 1648 | case elfcpp::R_PPC64_GOT16_LO_DS: |
| 1649 | if (gsym != NULL) |
| 1650 | { |
| 1651 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| 1652 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD); |
| 1653 | } |
| 1654 | else |
| 1655 | { |
| 1656 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 1657 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
| 1658 | got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD); |
| 1659 | } |
| 1660 | have_got_offset = true; |
| 1661 | break; |
| 1662 | |
| 1663 | // R_PPC_PLTREL24 is rather special. If non-zero, |
| 1664 | // the addend specifies the GOT pointer offset within .got2. |
| 1665 | case elfcpp::R_PPC_PLTREL24: |
| 1666 | if (addend >= 32768) |
| 1667 | { |
| 1668 | Output_data_space* got2; |
| 1669 | got2 = target->got2_section(); |
| 1670 | got2_offset = got2->offset(); |
| 1671 | addend += got2_offset; |
| 1672 | } |
| 1673 | have_got_offset = true; |
| 1674 | break; |
| 1675 | |
| 1676 | default: |
| 1677 | break; |
| 1678 | } |
| 1679 | |
| 1680 | switch (r_type) |
| 1681 | { |
| 1682 | case elfcpp::R_POWERPC_NONE: |
| 1683 | case elfcpp::R_POWERPC_GNU_VTINHERIT: |
| 1684 | case elfcpp::R_POWERPC_GNU_VTENTRY: |
| 1685 | break; |
| 1686 | |
| 1687 | case elfcpp::R_POWERPC_REL32: |
| 1688 | Reloc::rel32(view, object, psymval, addend, address); |
| 1689 | break; |
| 1690 | |
| 1691 | case elfcpp::R_POWERPC_REL24: |
| 1692 | Reloc::rel24(view, object, psymval, addend, address); |
| 1693 | break; |
| 1694 | |
| 1695 | case elfcpp::R_POWERPC_REL14: |
| 1696 | Reloc::rel14(view, object, psymval, addend, address); |
| 1697 | break; |
| 1698 | |
| 1699 | case elfcpp::R_PPC_PLTREL24: |
| 1700 | Reloc::rel24(view, object, psymval, addend, address); |
| 1701 | break; |
| 1702 | |
| 1703 | case elfcpp::R_PPC_LOCAL24PC: |
| 1704 | Reloc::rel24(view, object, psymval, addend, address); |
| 1705 | break; |
| 1706 | |
| 1707 | case elfcpp::R_PPC64_ADDR64: |
| 1708 | if (!parameters->options().output_is_position_independent()) |
| 1709 | Relocate_functions<size, big_endian>::rela64(view, object, |
| 1710 | psymval, addend); |
| 1711 | break; |
| 1712 | |
| 1713 | case elfcpp::R_POWERPC_ADDR32: |
| 1714 | if (!parameters->options().output_is_position_independent()) |
| 1715 | Relocate_functions<size, big_endian>::rela32(view, object, |
| 1716 | psymval, addend); |
| 1717 | break; |
| 1718 | |
| 1719 | case elfcpp::R_POWERPC_ADDR16_LO: |
| 1720 | Reloc::addr16_lo(view, object, psymval, addend); |
| 1721 | break; |
| 1722 | |
| 1723 | case elfcpp::R_POWERPC_ADDR16_HI: |
| 1724 | Reloc::addr16_hi(view, object, psymval, addend); |
| 1725 | break; |
| 1726 | |
| 1727 | case elfcpp::R_POWERPC_ADDR16_HA: |
| 1728 | Reloc::addr16_ha(view, object, psymval, addend); |
| 1729 | break; |
| 1730 | |
| 1731 | case elfcpp::R_PPC_REL16_LO: |
| 1732 | Reloc::rel16_lo(view, object, psymval, addend, address); |
| 1733 | break; |
| 1734 | |
| 1735 | case elfcpp::R_PPC_REL16_HI: |
| 1736 | Reloc::rel16_lo(view, object, psymval, addend, address); |
| 1737 | break; |
| 1738 | |
| 1739 | case elfcpp::R_PPC_REL16_HA: |
| 1740 | Reloc::rel16_ha(view, object, psymval, addend, address); |
| 1741 | break; |
| 1742 | |
| 1743 | case elfcpp::R_POWERPC_GOT16: |
| 1744 | Reloc::addr16(view, got_offset, addend); |
| 1745 | break; |
| 1746 | |
| 1747 | case elfcpp::R_POWERPC_GOT16_LO: |
| 1748 | Reloc::addr16_lo(view, got_offset, addend); |
| 1749 | break; |
| 1750 | |
| 1751 | case elfcpp::R_POWERPC_GOT16_HI: |
| 1752 | Reloc::addr16_hi(view, got_offset, addend); |
| 1753 | break; |
| 1754 | |
| 1755 | case elfcpp::R_POWERPC_GOT16_HA: |
| 1756 | Reloc::addr16_ha(view, got_offset, addend); |
| 1757 | break; |
| 1758 | |
| 1759 | case elfcpp::R_PPC64_TOC16: |
| 1760 | Reloc::addr16(view, got_offset, addend); |
| 1761 | break; |
| 1762 | |
| 1763 | case elfcpp::R_PPC64_TOC16_LO: |
| 1764 | Reloc::addr16_lo(view, got_offset, addend); |
| 1765 | break; |
| 1766 | |
| 1767 | case elfcpp::R_PPC64_TOC16_HI: |
| 1768 | Reloc::addr16_hi(view, got_offset, addend); |
| 1769 | break; |
| 1770 | |
| 1771 | case elfcpp::R_PPC64_TOC16_HA: |
| 1772 | Reloc::addr16_ha(view, got_offset, addend); |
| 1773 | break; |
| 1774 | |
| 1775 | case elfcpp::R_PPC64_TOC16_DS: |
| 1776 | case elfcpp::R_PPC64_TOC16_LO_DS: |
| 1777 | Reloc::addr16_ds(view, got_offset, addend); |
| 1778 | break; |
| 1779 | |
| 1780 | case elfcpp::R_PPC64_TOC: |
| 1781 | { |
| 1782 | elfcpp::Elf_types<64>::Elf_Addr value; |
| 1783 | value = target->toc_section()->address() + toc_base_offset; |
| 1784 | Relocate_functions<64, false>::rela64(view, value, addend); |
| 1785 | } |
| 1786 | break; |
| 1787 | |
| 1788 | case elfcpp::R_POWERPC_COPY: |
| 1789 | case elfcpp::R_POWERPC_GLOB_DAT: |
| 1790 | case elfcpp::R_POWERPC_JMP_SLOT: |
| 1791 | case elfcpp::R_POWERPC_RELATIVE: |
| 1792 | // This is an outstanding tls reloc, which is unexpected when |
| 1793 | // linking. |
| 1794 | case elfcpp::R_POWERPC_DTPMOD: |
| 1795 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 1796 | _("unexpected reloc %u in object file"), |
| 1797 | r_type); |
| 1798 | break; |
| 1799 | |
| 1800 | default: |
| 1801 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 1802 | _("unsupported reloc %u"), |
| 1803 | r_type); |
| 1804 | break; |
| 1805 | } |
| 1806 | |
| 1807 | return true; |
| 1808 | } |
| 1809 | |
| 1810 | // Perform a TLS relocation. |
| 1811 | |
| 1812 | template<int size, bool big_endian> |
| 1813 | inline void |
| 1814 | Target_powerpc<size, big_endian>::Relocate::relocate_tls( |
| 1815 | const Relocate_info<size, big_endian>* relinfo, |
| 1816 | Target_powerpc<size, big_endian>* target, |
| 1817 | size_t relnum, |
| 1818 | const elfcpp::Rela<size, big_endian>& rela, |
| 1819 | unsigned int r_type, |
| 1820 | const Sized_symbol<size>* gsym, |
| 1821 | const Symbol_value<size>* psymval, |
| 1822 | unsigned char* view, |
| 1823 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 1824 | section_size_type) |
| 1825 | { |
| 1826 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 1827 | typedef Powerpc_relocate_functions<size, big_endian> Reloc; |
| 1828 | const Sized_relobj<size, big_endian>* object = relinfo->object; |
| 1829 | |
| 1830 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 1831 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(object, 0); |
| 1832 | |
| 1833 | const bool is_final = |
| 1834 | (gsym == NULL |
| 1835 | ? !parameters->options().output_is_position_independent() |
| 1836 | : gsym->final_value_is_known()); |
| 1837 | const tls::Tls_optimization optimized_type |
| 1838 | = optimize_tls_reloc(is_final, r_type); |
| 1839 | |
| 1840 | switch (r_type) |
| 1841 | { |
| 1842 | // XXX |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | // Relocate section data. |
| 1847 | |
| 1848 | template<int size, bool big_endian> |
| 1849 | void |
| 1850 | Target_powerpc<size, big_endian>::relocate_section( |
| 1851 | const Relocate_info<size, big_endian>* relinfo, |
| 1852 | unsigned int sh_type, |
| 1853 | const unsigned char* prelocs, |
| 1854 | size_t reloc_count, |
| 1855 | Output_section* output_section, |
| 1856 | bool needs_special_offset_handling, |
| 1857 | unsigned char* view, |
| 1858 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 1859 | section_size_type view_size, |
| 1860 | const Reloc_symbol_changes* reloc_symbol_changes) |
| 1861 | { |
| 1862 | typedef Target_powerpc<size, big_endian> Powerpc; |
| 1863 | typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate; |
| 1864 | |
| 1865 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 1866 | |
| 1867 | gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA, |
| 1868 | Powerpc_relocate>( |
| 1869 | relinfo, |
| 1870 | this, |
| 1871 | prelocs, |
| 1872 | reloc_count, |
| 1873 | output_section, |
| 1874 | needs_special_offset_handling, |
| 1875 | view, |
| 1876 | address, |
| 1877 | view_size, |
| 1878 | reloc_symbol_changes); |
| 1879 | } |
| 1880 | |
| 1881 | // Return the size of a relocation while scanning during a relocatable |
| 1882 | // link. |
| 1883 | |
| 1884 | template<int size, bool big_endian> |
| 1885 | unsigned int |
| 1886 | Target_powerpc<size, big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( |
| 1887 | unsigned int, |
| 1888 | Relobj*) |
| 1889 | { |
| 1890 | // We are always SHT_RELA, so we should never get here. |
| 1891 | gold_unreachable(); |
| 1892 | return 0; |
| 1893 | } |
| 1894 | |
| 1895 | // Scan the relocs during a relocatable link. |
| 1896 | |
| 1897 | template<int size, bool big_endian> |
| 1898 | void |
| 1899 | Target_powerpc<size, big_endian>::scan_relocatable_relocs( |
| 1900 | const General_options& options, |
| 1901 | Symbol_table* symtab, |
| 1902 | Layout* layout, |
| 1903 | Sized_relobj<size, big_endian>* object, |
| 1904 | unsigned int data_shndx, |
| 1905 | unsigned int sh_type, |
| 1906 | const unsigned char* prelocs, |
| 1907 | size_t reloc_count, |
| 1908 | Output_section* output_section, |
| 1909 | bool needs_special_offset_handling, |
| 1910 | size_t local_symbol_count, |
| 1911 | const unsigned char* plocal_symbols, |
| 1912 | Relocatable_relocs* rr) |
| 1913 | { |
| 1914 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 1915 | |
| 1916 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, |
| 1917 | Relocatable_size_for_reloc> Scan_relocatable_relocs; |
| 1918 | |
| 1919 | gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, |
| 1920 | Scan_relocatable_relocs>( |
| 1921 | options, |
| 1922 | symtab, |
| 1923 | layout, |
| 1924 | object, |
| 1925 | data_shndx, |
| 1926 | prelocs, |
| 1927 | reloc_count, |
| 1928 | output_section, |
| 1929 | needs_special_offset_handling, |
| 1930 | local_symbol_count, |
| 1931 | plocal_symbols, |
| 1932 | rr); |
| 1933 | } |
| 1934 | |
| 1935 | // Relocate a section during a relocatable link. |
| 1936 | |
| 1937 | template<int size, bool big_endian> |
| 1938 | void |
| 1939 | Target_powerpc<size, big_endian>::relocate_for_relocatable( |
| 1940 | const Relocate_info<size, big_endian>* relinfo, |
| 1941 | unsigned int sh_type, |
| 1942 | const unsigned char* prelocs, |
| 1943 | size_t reloc_count, |
| 1944 | Output_section* output_section, |
| 1945 | off_t offset_in_output_section, |
| 1946 | const Relocatable_relocs* rr, |
| 1947 | unsigned char* view, |
| 1948 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 1949 | section_size_type view_size, |
| 1950 | unsigned char* reloc_view, |
| 1951 | section_size_type reloc_view_size) |
| 1952 | { |
| 1953 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 1954 | |
| 1955 | gold::relocate_for_relocatable<size, big_endian, elfcpp::SHT_RELA>( |
| 1956 | relinfo, |
| 1957 | prelocs, |
| 1958 | reloc_count, |
| 1959 | output_section, |
| 1960 | offset_in_output_section, |
| 1961 | rr, |
| 1962 | view, |
| 1963 | view_address, |
| 1964 | view_size, |
| 1965 | reloc_view, |
| 1966 | reloc_view_size); |
| 1967 | } |
| 1968 | |
| 1969 | // Return the value to use for a dynamic which requires special |
| 1970 | // treatment. This is how we support equality comparisons of function |
| 1971 | // pointers across shared library boundaries, as described in the |
| 1972 | // processor specific ABI supplement. |
| 1973 | |
| 1974 | template<int size, bool big_endian> |
| 1975 | uint64_t |
| 1976 | Target_powerpc<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
| 1977 | { |
| 1978 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| 1979 | return this->plt_section()->address() + gsym->plt_offset(); |
| 1980 | } |
| 1981 | |
| 1982 | // The selector for powerpc object files. |
| 1983 | |
| 1984 | template<int size, bool big_endian> |
| 1985 | class Target_selector_powerpc : public Target_selector |
| 1986 | { |
| 1987 | public: |
| 1988 | Target_selector_powerpc() |
| 1989 | : Target_selector(elfcpp::EM_NONE, size, big_endian, |
| 1990 | (size == 64 ? |
| 1991 | (big_endian ? "elf64-powerpc" : "elf64-powerpcle") : |
| 1992 | (big_endian ? "elf32-powerpc" : "elf32-powerpcle"))) |
| 1993 | { } |
| 1994 | |
| 1995 | Target* do_recognize(int machine, int, int) |
| 1996 | { |
| 1997 | switch (size) |
| 1998 | { |
| 1999 | case 64: |
| 2000 | if (machine != elfcpp::EM_PPC64) |
| 2001 | return NULL; |
| 2002 | break; |
| 2003 | |
| 2004 | case 32: |
| 2005 | if (machine != elfcpp::EM_PPC) |
| 2006 | return NULL; |
| 2007 | break; |
| 2008 | |
| 2009 | default: |
| 2010 | return NULL; |
| 2011 | } |
| 2012 | |
| 2013 | return this->instantiate_target(); |
| 2014 | } |
| 2015 | |
| 2016 | Target* do_instantiate_target() |
| 2017 | { return new Target_powerpc<size, big_endian>(); } |
| 2018 | }; |
| 2019 | |
| 2020 | Target_selector_powerpc<32, true> target_selector_ppc32; |
| 2021 | Target_selector_powerpc<32, false> target_selector_ppc32le; |
| 2022 | Target_selector_powerpc<64, true> target_selector_ppc64; |
| 2023 | Target_selector_powerpc<64, false> target_selector_ppc64le; |
| 2024 | |
| 2025 | } // End anonymous namespace. |