| 1 | // mips.cc -- mips target support for gold. |
| 2 | |
| 3 | // Copyright (C) 2011-2017 Free Software Foundation, Inc. |
| 4 | // Written by Sasa Stankovic <sasa.stankovic@imgtec.com> |
| 5 | // and Aleksandar Simeonov <aleksandar.simeonov@rt-rk.com>. |
| 6 | // This file contains borrowed and adapted code from bfd/elfxx-mips.c. |
| 7 | |
| 8 | // This file is part of gold. |
| 9 | |
| 10 | // This program is free software; you can redistribute it and/or modify |
| 11 | // it under the terms of the GNU General Public License as published by |
| 12 | // the Free Software Foundation; either version 3 of the License, or |
| 13 | // (at your option) any later version. |
| 14 | |
| 15 | // This program is distributed in the hope that it will be useful, |
| 16 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | // GNU General Public License for more details. |
| 19 | |
| 20 | // You should have received a copy of the GNU General Public License |
| 21 | // along with this program; if not, write to the Free Software |
| 22 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 23 | // MA 02110-1301, USA. |
| 24 | |
| 25 | #include "gold.h" |
| 26 | |
| 27 | #include <algorithm> |
| 28 | #include <set> |
| 29 | #include <sstream> |
| 30 | #include "demangle.h" |
| 31 | |
| 32 | #include "elfcpp.h" |
| 33 | #include "parameters.h" |
| 34 | #include "reloc.h" |
| 35 | #include "mips.h" |
| 36 | #include "object.h" |
| 37 | #include "symtab.h" |
| 38 | #include "layout.h" |
| 39 | #include "output.h" |
| 40 | #include "copy-relocs.h" |
| 41 | #include "target.h" |
| 42 | #include "target-reloc.h" |
| 43 | #include "target-select.h" |
| 44 | #include "tls.h" |
| 45 | #include "errors.h" |
| 46 | #include "gc.h" |
| 47 | #include "attributes.h" |
| 48 | #include "nacl.h" |
| 49 | |
| 50 | namespace |
| 51 | { |
| 52 | using namespace gold; |
| 53 | |
| 54 | template<int size, bool big_endian> |
| 55 | class Mips_output_data_plt; |
| 56 | |
| 57 | template<int size, bool big_endian> |
| 58 | class Mips_output_data_got; |
| 59 | |
| 60 | template<int size, bool big_endian> |
| 61 | class Target_mips; |
| 62 | |
| 63 | template<int size, bool big_endian> |
| 64 | class Mips_output_section_reginfo; |
| 65 | |
| 66 | template<int size, bool big_endian> |
| 67 | class Mips_output_section_options; |
| 68 | |
| 69 | template<int size, bool big_endian> |
| 70 | class Mips_output_data_la25_stub; |
| 71 | |
| 72 | template<int size, bool big_endian> |
| 73 | class Mips_output_data_mips_stubs; |
| 74 | |
| 75 | template<int size> |
| 76 | class Mips_symbol; |
| 77 | |
| 78 | template<int size, bool big_endian> |
| 79 | class Mips_got_info; |
| 80 | |
| 81 | template<int size, bool big_endian> |
| 82 | class Mips_relobj; |
| 83 | |
| 84 | class Mips16_stub_section_base; |
| 85 | |
| 86 | template<int size, bool big_endian> |
| 87 | class Mips16_stub_section; |
| 88 | |
| 89 | // The ABI says that every symbol used by dynamic relocations must have |
| 90 | // a global GOT entry. Among other things, this provides the dynamic |
| 91 | // linker with a free, directly-indexed cache. The GOT can therefore |
| 92 | // contain symbols that are not referenced by GOT relocations themselves |
| 93 | // (in other words, it may have symbols that are not referenced by things |
| 94 | // like R_MIPS_GOT16 and R_MIPS_GOT_PAGE). |
| 95 | |
| 96 | // GOT relocations are less likely to overflow if we put the associated |
| 97 | // GOT entries towards the beginning. We therefore divide the global |
| 98 | // GOT entries into two areas: "normal" and "reloc-only". Entries in |
| 99 | // the first area can be used for both dynamic relocations and GP-relative |
| 100 | // accesses, while those in the "reloc-only" area are for dynamic |
| 101 | // relocations only. |
| 102 | |
| 103 | // These GGA_* ("Global GOT Area") values are organised so that lower |
| 104 | // values are more general than higher values. Also, non-GGA_NONE |
| 105 | // values are ordered by the position of the area in the GOT. |
| 106 | |
| 107 | enum Global_got_area |
| 108 | { |
| 109 | GGA_NORMAL = 0, |
| 110 | GGA_RELOC_ONLY = 1, |
| 111 | GGA_NONE = 2 |
| 112 | }; |
| 113 | |
| 114 | // The types of GOT entries needed for this platform. |
| 115 | // These values are exposed to the ABI in an incremental link. |
| 116 | // Do not renumber existing values without changing the version |
| 117 | // number of the .gnu_incremental_inputs section. |
| 118 | enum Got_type |
| 119 | { |
| 120 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol |
| 121 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset |
| 122 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair |
| 123 | |
| 124 | // GOT entries for multi-GOT. We support up to 1024 GOTs in multi-GOT links. |
| 125 | GOT_TYPE_STANDARD_MULTIGOT = 3, |
| 126 | GOT_TYPE_TLS_OFFSET_MULTIGOT = GOT_TYPE_STANDARD_MULTIGOT + 1024, |
| 127 | GOT_TYPE_TLS_PAIR_MULTIGOT = GOT_TYPE_TLS_OFFSET_MULTIGOT + 1024 |
| 128 | }; |
| 129 | |
| 130 | // TLS type of GOT entry. |
| 131 | enum Got_tls_type |
| 132 | { |
| 133 | GOT_TLS_NONE = 0, |
| 134 | GOT_TLS_GD = 1, |
| 135 | GOT_TLS_LDM = 2, |
| 136 | GOT_TLS_IE = 4 |
| 137 | }; |
| 138 | |
| 139 | // Values found in the r_ssym field of a relocation entry. |
| 140 | enum Special_relocation_symbol |
| 141 | { |
| 142 | RSS_UNDEF = 0, // None - value is zero. |
| 143 | RSS_GP = 1, // Value of GP. |
| 144 | RSS_GP0 = 2, // Value of GP in object being relocated. |
| 145 | RSS_LOC = 3 // Address of location being relocated. |
| 146 | }; |
| 147 | |
| 148 | // Whether the section is readonly. |
| 149 | static inline bool |
| 150 | is_readonly_section(Output_section* output_section) |
| 151 | { |
| 152 | elfcpp::Elf_Xword section_flags = output_section->flags(); |
| 153 | elfcpp::Elf_Word section_type = output_section->type(); |
| 154 | |
| 155 | if (section_type == elfcpp::SHT_NOBITS) |
| 156 | return false; |
| 157 | |
| 158 | if (section_flags & elfcpp::SHF_WRITE) |
| 159 | return false; |
| 160 | |
| 161 | return true; |
| 162 | } |
| 163 | |
| 164 | // Return TRUE if a relocation of type R_TYPE from OBJECT might |
| 165 | // require an la25 stub. See also local_pic_function, which determines |
| 166 | // whether the destination function ever requires a stub. |
| 167 | template<int size, bool big_endian> |
| 168 | static inline bool |
| 169 | relocation_needs_la25_stub(Mips_relobj<size, big_endian>* object, |
| 170 | unsigned int r_type, bool target_is_16_bit_code) |
| 171 | { |
| 172 | // We specifically ignore branches and jumps from EF_PIC objects, |
| 173 | // where the onus is on the compiler or programmer to perform any |
| 174 | // necessary initialization of $25. Sometimes such initialization |
| 175 | // is unnecessary; for example, -mno-shared functions do not use |
| 176 | // the incoming value of $25, and may therefore be called directly. |
| 177 | if (object->is_pic()) |
| 178 | return false; |
| 179 | |
| 180 | switch (r_type) |
| 181 | { |
| 182 | case elfcpp::R_MIPS_26: |
| 183 | case elfcpp::R_MIPS_PC16: |
| 184 | case elfcpp::R_MIPS_PC21_S2: |
| 185 | case elfcpp::R_MIPS_PC26_S2: |
| 186 | case elfcpp::R_MICROMIPS_26_S1: |
| 187 | case elfcpp::R_MICROMIPS_PC7_S1: |
| 188 | case elfcpp::R_MICROMIPS_PC10_S1: |
| 189 | case elfcpp::R_MICROMIPS_PC16_S1: |
| 190 | case elfcpp::R_MICROMIPS_PC23_S2: |
| 191 | return true; |
| 192 | |
| 193 | case elfcpp::R_MIPS16_26: |
| 194 | return !target_is_16_bit_code; |
| 195 | |
| 196 | default: |
| 197 | return false; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | // Return true if SYM is a locally-defined PIC function, in the sense |
| 202 | // that it or its fn_stub might need $25 to be valid on entry. |
| 203 | // Note that MIPS16 functions set up $gp using PC-relative instructions, |
| 204 | // so they themselves never need $25 to be valid. Only non-MIPS16 |
| 205 | // entry points are of interest here. |
| 206 | template<int size, bool big_endian> |
| 207 | static inline bool |
| 208 | local_pic_function(Mips_symbol<size>* sym) |
| 209 | { |
| 210 | bool def_regular = (sym->source() == Symbol::FROM_OBJECT |
| 211 | && !sym->object()->is_dynamic() |
| 212 | && !sym->is_undefined()); |
| 213 | |
| 214 | if (sym->is_defined() && def_regular) |
| 215 | { |
| 216 | Mips_relobj<size, big_endian>* object = |
| 217 | static_cast<Mips_relobj<size, big_endian>*>(sym->object()); |
| 218 | |
| 219 | if ((object->is_pic() || sym->is_pic()) |
| 220 | && (!sym->is_mips16() |
| 221 | || (sym->has_mips16_fn_stub() && sym->need_fn_stub()))) |
| 222 | return true; |
| 223 | } |
| 224 | return false; |
| 225 | } |
| 226 | |
| 227 | static inline bool |
| 228 | hi16_reloc(int r_type) |
| 229 | { |
| 230 | return (r_type == elfcpp::R_MIPS_HI16 |
| 231 | || r_type == elfcpp::R_MIPS16_HI16 |
| 232 | || r_type == elfcpp::R_MICROMIPS_HI16 |
| 233 | || r_type == elfcpp::R_MIPS_PCHI16); |
| 234 | } |
| 235 | |
| 236 | static inline bool |
| 237 | lo16_reloc(int r_type) |
| 238 | { |
| 239 | return (r_type == elfcpp::R_MIPS_LO16 |
| 240 | || r_type == elfcpp::R_MIPS16_LO16 |
| 241 | || r_type == elfcpp::R_MICROMIPS_LO16 |
| 242 | || r_type == elfcpp::R_MIPS_PCLO16); |
| 243 | } |
| 244 | |
| 245 | static inline bool |
| 246 | got16_reloc(unsigned int r_type) |
| 247 | { |
| 248 | return (r_type == elfcpp::R_MIPS_GOT16 |
| 249 | || r_type == elfcpp::R_MIPS16_GOT16 |
| 250 | || r_type == elfcpp::R_MICROMIPS_GOT16); |
| 251 | } |
| 252 | |
| 253 | static inline bool |
| 254 | call_lo16_reloc(unsigned int r_type) |
| 255 | { |
| 256 | return (r_type == elfcpp::R_MIPS_CALL_LO16 |
| 257 | || r_type == elfcpp::R_MICROMIPS_CALL_LO16); |
| 258 | } |
| 259 | |
| 260 | static inline bool |
| 261 | got_lo16_reloc(unsigned int r_type) |
| 262 | { |
| 263 | return (r_type == elfcpp::R_MIPS_GOT_LO16 |
| 264 | || r_type == elfcpp::R_MICROMIPS_GOT_LO16); |
| 265 | } |
| 266 | |
| 267 | static inline bool |
| 268 | eh_reloc(unsigned int r_type) |
| 269 | { |
| 270 | return (r_type == elfcpp::R_MIPS_EH); |
| 271 | } |
| 272 | |
| 273 | static inline bool |
| 274 | got_disp_reloc(unsigned int r_type) |
| 275 | { |
| 276 | return (r_type == elfcpp::R_MIPS_GOT_DISP |
| 277 | || r_type == elfcpp::R_MICROMIPS_GOT_DISP); |
| 278 | } |
| 279 | |
| 280 | static inline bool |
| 281 | got_page_reloc(unsigned int r_type) |
| 282 | { |
| 283 | return (r_type == elfcpp::R_MIPS_GOT_PAGE |
| 284 | || r_type == elfcpp::R_MICROMIPS_GOT_PAGE); |
| 285 | } |
| 286 | |
| 287 | static inline bool |
| 288 | tls_gd_reloc(unsigned int r_type) |
| 289 | { |
| 290 | return (r_type == elfcpp::R_MIPS_TLS_GD |
| 291 | || r_type == elfcpp::R_MIPS16_TLS_GD |
| 292 | || r_type == elfcpp::R_MICROMIPS_TLS_GD); |
| 293 | } |
| 294 | |
| 295 | static inline bool |
| 296 | tls_gottprel_reloc(unsigned int r_type) |
| 297 | { |
| 298 | return (r_type == elfcpp::R_MIPS_TLS_GOTTPREL |
| 299 | || r_type == elfcpp::R_MIPS16_TLS_GOTTPREL |
| 300 | || r_type == elfcpp::R_MICROMIPS_TLS_GOTTPREL); |
| 301 | } |
| 302 | |
| 303 | static inline bool |
| 304 | tls_ldm_reloc(unsigned int r_type) |
| 305 | { |
| 306 | return (r_type == elfcpp::R_MIPS_TLS_LDM |
| 307 | || r_type == elfcpp::R_MIPS16_TLS_LDM |
| 308 | || r_type == elfcpp::R_MICROMIPS_TLS_LDM); |
| 309 | } |
| 310 | |
| 311 | static inline bool |
| 312 | mips16_call_reloc(unsigned int r_type) |
| 313 | { |
| 314 | return (r_type == elfcpp::R_MIPS16_26 |
| 315 | || r_type == elfcpp::R_MIPS16_CALL16); |
| 316 | } |
| 317 | |
| 318 | static inline bool |
| 319 | jal_reloc(unsigned int r_type) |
| 320 | { |
| 321 | return (r_type == elfcpp::R_MIPS_26 |
| 322 | || r_type == elfcpp::R_MIPS16_26 |
| 323 | || r_type == elfcpp::R_MICROMIPS_26_S1); |
| 324 | } |
| 325 | |
| 326 | static inline bool |
| 327 | micromips_branch_reloc(unsigned int r_type) |
| 328 | { |
| 329 | return (r_type == elfcpp::R_MICROMIPS_26_S1 |
| 330 | || r_type == elfcpp::R_MICROMIPS_PC16_S1 |
| 331 | || r_type == elfcpp::R_MICROMIPS_PC10_S1 |
| 332 | || r_type == elfcpp::R_MICROMIPS_PC7_S1); |
| 333 | } |
| 334 | |
| 335 | // Check if R_TYPE is a MIPS16 reloc. |
| 336 | static inline bool |
| 337 | mips16_reloc(unsigned int r_type) |
| 338 | { |
| 339 | switch (r_type) |
| 340 | { |
| 341 | case elfcpp::R_MIPS16_26: |
| 342 | case elfcpp::R_MIPS16_GPREL: |
| 343 | case elfcpp::R_MIPS16_GOT16: |
| 344 | case elfcpp::R_MIPS16_CALL16: |
| 345 | case elfcpp::R_MIPS16_HI16: |
| 346 | case elfcpp::R_MIPS16_LO16: |
| 347 | case elfcpp::R_MIPS16_TLS_GD: |
| 348 | case elfcpp::R_MIPS16_TLS_LDM: |
| 349 | case elfcpp::R_MIPS16_TLS_DTPREL_HI16: |
| 350 | case elfcpp::R_MIPS16_TLS_DTPREL_LO16: |
| 351 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 352 | case elfcpp::R_MIPS16_TLS_TPREL_HI16: |
| 353 | case elfcpp::R_MIPS16_TLS_TPREL_LO16: |
| 354 | return true; |
| 355 | |
| 356 | default: |
| 357 | return false; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | // Check if R_TYPE is a microMIPS reloc. |
| 362 | static inline bool |
| 363 | micromips_reloc(unsigned int r_type) |
| 364 | { |
| 365 | switch (r_type) |
| 366 | { |
| 367 | case elfcpp::R_MICROMIPS_26_S1: |
| 368 | case elfcpp::R_MICROMIPS_HI16: |
| 369 | case elfcpp::R_MICROMIPS_LO16: |
| 370 | case elfcpp::R_MICROMIPS_GPREL16: |
| 371 | case elfcpp::R_MICROMIPS_LITERAL: |
| 372 | case elfcpp::R_MICROMIPS_GOT16: |
| 373 | case elfcpp::R_MICROMIPS_PC7_S1: |
| 374 | case elfcpp::R_MICROMIPS_PC10_S1: |
| 375 | case elfcpp::R_MICROMIPS_PC16_S1: |
| 376 | case elfcpp::R_MICROMIPS_CALL16: |
| 377 | case elfcpp::R_MICROMIPS_GOT_DISP: |
| 378 | case elfcpp::R_MICROMIPS_GOT_PAGE: |
| 379 | case elfcpp::R_MICROMIPS_GOT_OFST: |
| 380 | case elfcpp::R_MICROMIPS_GOT_HI16: |
| 381 | case elfcpp::R_MICROMIPS_GOT_LO16: |
| 382 | case elfcpp::R_MICROMIPS_SUB: |
| 383 | case elfcpp::R_MICROMIPS_HIGHER: |
| 384 | case elfcpp::R_MICROMIPS_HIGHEST: |
| 385 | case elfcpp::R_MICROMIPS_CALL_HI16: |
| 386 | case elfcpp::R_MICROMIPS_CALL_LO16: |
| 387 | case elfcpp::R_MICROMIPS_SCN_DISP: |
| 388 | case elfcpp::R_MICROMIPS_JALR: |
| 389 | case elfcpp::R_MICROMIPS_HI0_LO16: |
| 390 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 391 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 392 | case elfcpp::R_MICROMIPS_TLS_DTPREL_HI16: |
| 393 | case elfcpp::R_MICROMIPS_TLS_DTPREL_LO16: |
| 394 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 395 | case elfcpp::R_MICROMIPS_TLS_TPREL_HI16: |
| 396 | case elfcpp::R_MICROMIPS_TLS_TPREL_LO16: |
| 397 | case elfcpp::R_MICROMIPS_GPREL7_S2: |
| 398 | case elfcpp::R_MICROMIPS_PC23_S2: |
| 399 | return true; |
| 400 | |
| 401 | default: |
| 402 | return false; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | static inline bool |
| 407 | is_matching_lo16_reloc(unsigned int high_reloc, unsigned int lo16_reloc) |
| 408 | { |
| 409 | switch (high_reloc) |
| 410 | { |
| 411 | case elfcpp::R_MIPS_HI16: |
| 412 | case elfcpp::R_MIPS_GOT16: |
| 413 | return lo16_reloc == elfcpp::R_MIPS_LO16; |
| 414 | case elfcpp::R_MIPS_PCHI16: |
| 415 | return lo16_reloc == elfcpp::R_MIPS_PCLO16; |
| 416 | case elfcpp::R_MIPS16_HI16: |
| 417 | case elfcpp::R_MIPS16_GOT16: |
| 418 | return lo16_reloc == elfcpp::R_MIPS16_LO16; |
| 419 | case elfcpp::R_MICROMIPS_HI16: |
| 420 | case elfcpp::R_MICROMIPS_GOT16: |
| 421 | return lo16_reloc == elfcpp::R_MICROMIPS_LO16; |
| 422 | default: |
| 423 | return false; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | // This class is used to hold information about one GOT entry. |
| 428 | // There are three types of entry: |
| 429 | // |
| 430 | // (1) a SYMBOL + OFFSET address, where SYMBOL is local to an input object |
| 431 | // (object != NULL, symndx >= 0, tls_type != GOT_TLS_LDM) |
| 432 | // (2) a SYMBOL address, where SYMBOL is not local to an input object |
| 433 | // (sym != NULL, symndx == -1) |
| 434 | // (3) a TLS LDM slot (there's only one of these per GOT.) |
| 435 | // (object != NULL, symndx == 0, tls_type == GOT_TLS_LDM) |
| 436 | |
| 437 | template<int size, bool big_endian> |
| 438 | class Mips_got_entry |
| 439 | { |
| 440 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 441 | |
| 442 | public: |
| 443 | Mips_got_entry(Mips_relobj<size, big_endian>* object, unsigned int symndx, |
| 444 | Mips_address addend, unsigned char tls_type, |
| 445 | unsigned int shndx, bool is_section_symbol) |
| 446 | : addend_(addend), symndx_(symndx), tls_type_(tls_type), |
| 447 | is_section_symbol_(is_section_symbol), shndx_(shndx) |
| 448 | { this->d.object = object; } |
| 449 | |
| 450 | Mips_got_entry(Mips_symbol<size>* sym, unsigned char tls_type) |
| 451 | : addend_(0), symndx_(-1U), tls_type_(tls_type), |
| 452 | is_section_symbol_(false), shndx_(-1U) |
| 453 | { this->d.sym = sym; } |
| 454 | |
| 455 | // Return whether this entry is for a local symbol. |
| 456 | bool |
| 457 | is_for_local_symbol() const |
| 458 | { return this->symndx_ != -1U; } |
| 459 | |
| 460 | // Return whether this entry is for a global symbol. |
| 461 | bool |
| 462 | is_for_global_symbol() const |
| 463 | { return this->symndx_ == -1U; } |
| 464 | |
| 465 | // Return the hash of this entry. |
| 466 | size_t |
| 467 | hash() const |
| 468 | { |
| 469 | if (this->tls_type_ == GOT_TLS_LDM) |
| 470 | return this->symndx_ + (1 << 18); |
| 471 | |
| 472 | size_t name_hash_value = gold::string_hash<char>( |
| 473 | (this->symndx_ != -1U) |
| 474 | ? this->d.object->name().c_str() |
| 475 | : this->d.sym->name()); |
| 476 | size_t addend = this->addend_; |
| 477 | return name_hash_value ^ this->symndx_ ^ (addend << 16); |
| 478 | } |
| 479 | |
| 480 | // Return whether this entry is equal to OTHER. |
| 481 | bool |
| 482 | equals(Mips_got_entry<size, big_endian>* other) const |
| 483 | { |
| 484 | if (this->symndx_ != other->symndx_ |
| 485 | || this->tls_type_ != other->tls_type_) |
| 486 | return false; |
| 487 | |
| 488 | if (this->tls_type_ == GOT_TLS_LDM) |
| 489 | return true; |
| 490 | |
| 491 | return (((this->symndx_ != -1U) |
| 492 | ? (this->d.object == other->d.object) |
| 493 | : (this->d.sym == other->d.sym)) |
| 494 | && (this->addend_ == other->addend_)); |
| 495 | } |
| 496 | |
| 497 | // Return input object that needs this GOT entry. |
| 498 | Mips_relobj<size, big_endian>* |
| 499 | object() const |
| 500 | { |
| 501 | gold_assert(this->symndx_ != -1U); |
| 502 | return this->d.object; |
| 503 | } |
| 504 | |
| 505 | // Return local symbol index for local GOT entries. |
| 506 | unsigned int |
| 507 | symndx() const |
| 508 | { |
| 509 | gold_assert(this->symndx_ != -1U); |
| 510 | return this->symndx_; |
| 511 | } |
| 512 | |
| 513 | // Return the relocation addend for local GOT entries. |
| 514 | Mips_address |
| 515 | addend() const |
| 516 | { return this->addend_; } |
| 517 | |
| 518 | // Return global symbol for global GOT entries. |
| 519 | Mips_symbol<size>* |
| 520 | sym() const |
| 521 | { |
| 522 | gold_assert(this->symndx_ == -1U); |
| 523 | return this->d.sym; |
| 524 | } |
| 525 | |
| 526 | // Return whether this is a TLS GOT entry. |
| 527 | bool |
| 528 | is_tls_entry() const |
| 529 | { return this->tls_type_ != GOT_TLS_NONE; } |
| 530 | |
| 531 | // Return TLS type of this GOT entry. |
| 532 | unsigned char |
| 533 | tls_type() const |
| 534 | { return this->tls_type_; } |
| 535 | |
| 536 | // Return section index of the local symbol for local GOT entries. |
| 537 | unsigned int |
| 538 | shndx() const |
| 539 | { return this->shndx_; } |
| 540 | |
| 541 | // Return whether this is a STT_SECTION symbol. |
| 542 | bool |
| 543 | is_section_symbol() const |
| 544 | { return this->is_section_symbol_; } |
| 545 | |
| 546 | private: |
| 547 | // The addend. |
| 548 | Mips_address addend_; |
| 549 | |
| 550 | // The index of the symbol if we have a local symbol; -1 otherwise. |
| 551 | unsigned int symndx_; |
| 552 | |
| 553 | union |
| 554 | { |
| 555 | // The input object for local symbols that needs the GOT entry. |
| 556 | Mips_relobj<size, big_endian>* object; |
| 557 | // If symndx == -1, the global symbol corresponding to this GOT entry. The |
| 558 | // symbol's entry is in the local area if mips_sym->global_got_area is |
| 559 | // GGA_NONE, otherwise it is in the global area. |
| 560 | Mips_symbol<size>* sym; |
| 561 | } d; |
| 562 | |
| 563 | // The TLS type of this GOT entry. An LDM GOT entry will be a local |
| 564 | // symbol entry with r_symndx == 0. |
| 565 | unsigned char tls_type_; |
| 566 | |
| 567 | // Whether this is a STT_SECTION symbol. |
| 568 | bool is_section_symbol_; |
| 569 | |
| 570 | // For local GOT entries, section index of the local symbol. |
| 571 | unsigned int shndx_; |
| 572 | }; |
| 573 | |
| 574 | // Hash for Mips_got_entry. |
| 575 | |
| 576 | template<int size, bool big_endian> |
| 577 | class Mips_got_entry_hash |
| 578 | { |
| 579 | public: |
| 580 | size_t |
| 581 | operator()(Mips_got_entry<size, big_endian>* entry) const |
| 582 | { return entry->hash(); } |
| 583 | }; |
| 584 | |
| 585 | // Equality for Mips_got_entry. |
| 586 | |
| 587 | template<int size, bool big_endian> |
| 588 | class Mips_got_entry_eq |
| 589 | { |
| 590 | public: |
| 591 | bool |
| 592 | operator()(Mips_got_entry<size, big_endian>* e1, |
| 593 | Mips_got_entry<size, big_endian>* e2) const |
| 594 | { return e1->equals(e2); } |
| 595 | }; |
| 596 | |
| 597 | // Hash for Mips_symbol. |
| 598 | |
| 599 | template<int size> |
| 600 | class Mips_symbol_hash |
| 601 | { |
| 602 | public: |
| 603 | size_t |
| 604 | operator()(Mips_symbol<size>* sym) const |
| 605 | { return sym->hash(); } |
| 606 | }; |
| 607 | |
| 608 | // Got_page_range. This class describes a range of addends: [MIN_ADDEND, |
| 609 | // MAX_ADDEND]. The instances form a non-overlapping list that is sorted by |
| 610 | // increasing MIN_ADDEND. |
| 611 | |
| 612 | struct Got_page_range |
| 613 | { |
| 614 | Got_page_range() |
| 615 | : next(NULL), min_addend(0), max_addend(0) |
| 616 | { } |
| 617 | |
| 618 | Got_page_range* next; |
| 619 | int min_addend; |
| 620 | int max_addend; |
| 621 | |
| 622 | // Return the maximum number of GOT page entries required. |
| 623 | int |
| 624 | get_max_pages() |
| 625 | { return (this->max_addend - this->min_addend + 0x1ffff) >> 16; } |
| 626 | }; |
| 627 | |
| 628 | // Got_page_entry. This class describes the range of addends that are applied |
| 629 | // to page relocations against a given symbol. |
| 630 | |
| 631 | struct Got_page_entry |
| 632 | { |
| 633 | Got_page_entry() |
| 634 | : object(NULL), symndx(-1U), ranges(NULL), num_pages(0) |
| 635 | { } |
| 636 | |
| 637 | Got_page_entry(Object* object_, unsigned int symndx_) |
| 638 | : object(object_), symndx(symndx_), ranges(NULL), num_pages(0) |
| 639 | { } |
| 640 | |
| 641 | // The input object that needs the GOT page entry. |
| 642 | Object* object; |
| 643 | // The index of the symbol, as stored in the relocation r_info. |
| 644 | unsigned int symndx; |
| 645 | // The ranges for this page entry. |
| 646 | Got_page_range* ranges; |
| 647 | // The maximum number of page entries needed for RANGES. |
| 648 | unsigned int num_pages; |
| 649 | }; |
| 650 | |
| 651 | // Hash for Got_page_entry. |
| 652 | |
| 653 | struct Got_page_entry_hash |
| 654 | { |
| 655 | size_t |
| 656 | operator()(Got_page_entry* entry) const |
| 657 | { return reinterpret_cast<uintptr_t>(entry->object) + entry->symndx; } |
| 658 | }; |
| 659 | |
| 660 | // Equality for Got_page_entry. |
| 661 | |
| 662 | struct Got_page_entry_eq |
| 663 | { |
| 664 | bool |
| 665 | operator()(Got_page_entry* entry1, Got_page_entry* entry2) const |
| 666 | { |
| 667 | return entry1->object == entry2->object && entry1->symndx == entry2->symndx; |
| 668 | } |
| 669 | }; |
| 670 | |
| 671 | // This class is used to hold .got information when linking. |
| 672 | |
| 673 | template<int size, bool big_endian> |
| 674 | class Mips_got_info |
| 675 | { |
| 676 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 677 | typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> |
| 678 | Reloc_section; |
| 679 | typedef Unordered_map<unsigned int, unsigned int> Got_page_offsets; |
| 680 | |
| 681 | // Unordered set of GOT entries. |
| 682 | typedef Unordered_set<Mips_got_entry<size, big_endian>*, |
| 683 | Mips_got_entry_hash<size, big_endian>, |
| 684 | Mips_got_entry_eq<size, big_endian> > Got_entry_set; |
| 685 | |
| 686 | // Unordered set of GOT page entries. |
| 687 | typedef Unordered_set<Got_page_entry*, |
| 688 | Got_page_entry_hash, Got_page_entry_eq> Got_page_entry_set; |
| 689 | |
| 690 | // Unordered set of global GOT entries. |
| 691 | typedef Unordered_set<Mips_symbol<size>*, Mips_symbol_hash<size> > |
| 692 | Global_got_entry_set; |
| 693 | |
| 694 | public: |
| 695 | Mips_got_info() |
| 696 | : local_gotno_(0), page_gotno_(0), global_gotno_(0), reloc_only_gotno_(0), |
| 697 | tls_gotno_(0), tls_ldm_offset_(-1U), global_got_symbols_(), |
| 698 | got_entries_(), got_page_entries_(), got_page_offset_start_(0), |
| 699 | got_page_offset_next_(0), got_page_offsets_(), next_(NULL), index_(-1U), |
| 700 | offset_(0) |
| 701 | { } |
| 702 | |
| 703 | // Reserve GOT entry for a GOT relocation of type R_TYPE against symbol |
| 704 | // SYMNDX + ADDEND, where SYMNDX is a local symbol in section SHNDX in OBJECT. |
| 705 | void |
| 706 | record_local_got_symbol(Mips_relobj<size, big_endian>* object, |
| 707 | unsigned int symndx, Mips_address addend, |
| 708 | unsigned int r_type, unsigned int shndx, |
| 709 | bool is_section_symbol); |
| 710 | |
| 711 | // Reserve GOT entry for a GOT relocation of type R_TYPE against MIPS_SYM, |
| 712 | // in OBJECT. FOR_CALL is true if the caller is only interested in |
| 713 | // using the GOT entry for calls. DYN_RELOC is true if R_TYPE is a dynamic |
| 714 | // relocation. |
| 715 | void |
| 716 | record_global_got_symbol(Mips_symbol<size>* mips_sym, |
| 717 | Mips_relobj<size, big_endian>* object, |
| 718 | unsigned int r_type, bool dyn_reloc, bool for_call); |
| 719 | |
| 720 | // Add ENTRY to master GOT and to OBJECT's GOT. |
| 721 | void |
| 722 | record_got_entry(Mips_got_entry<size, big_endian>* entry, |
| 723 | Mips_relobj<size, big_endian>* object); |
| 724 | |
| 725 | // Record that OBJECT has a page relocation against symbol SYMNDX and |
| 726 | // that ADDEND is the addend for that relocation. |
| 727 | void |
| 728 | record_got_page_entry(Mips_relobj<size, big_endian>* object, |
| 729 | unsigned int symndx, int addend); |
| 730 | |
| 731 | // Create all entries that should be in the local part of the GOT. |
| 732 | void |
| 733 | add_local_entries(Target_mips<size, big_endian>* target, Layout* layout); |
| 734 | |
| 735 | // Create GOT page entries. |
| 736 | void |
| 737 | add_page_entries(Target_mips<size, big_endian>* target, Layout* layout); |
| 738 | |
| 739 | // Create global GOT entries, both GGA_NORMAL and GGA_RELOC_ONLY. |
| 740 | void |
| 741 | add_global_entries(Target_mips<size, big_endian>* target, Layout* layout, |
| 742 | unsigned int non_reloc_only_global_gotno); |
| 743 | |
| 744 | // Create global GOT entries that should be in the GGA_RELOC_ONLY area. |
| 745 | void |
| 746 | add_reloc_only_entries(Mips_output_data_got<size, big_endian>* got); |
| 747 | |
| 748 | // Create TLS GOT entries. |
| 749 | void |
| 750 | add_tls_entries(Target_mips<size, big_endian>* target, Layout* layout); |
| 751 | |
| 752 | // Decide whether the symbol needs an entry in the global part of the primary |
| 753 | // GOT, setting global_got_area accordingly. Count the number of global |
| 754 | // symbols that are in the primary GOT only because they have dynamic |
| 755 | // relocations R_MIPS_REL32 against them (reloc_only_gotno). |
| 756 | void |
| 757 | count_got_symbols(Symbol_table* symtab); |
| 758 | |
| 759 | // Return the offset of GOT page entry for VALUE. |
| 760 | unsigned int |
| 761 | get_got_page_offset(Mips_address value, |
| 762 | Mips_output_data_got<size, big_endian>* got); |
| 763 | |
| 764 | // Count the number of GOT entries required. |
| 765 | void |
| 766 | count_got_entries(); |
| 767 | |
| 768 | // Count the number of GOT entries required by ENTRY. Accumulate the result. |
| 769 | void |
| 770 | count_got_entry(Mips_got_entry<size, big_endian>* entry); |
| 771 | |
| 772 | // Add FROM's GOT entries. |
| 773 | void |
| 774 | add_got_entries(Mips_got_info<size, big_endian>* from); |
| 775 | |
| 776 | // Add FROM's GOT page entries. |
| 777 | void |
| 778 | add_got_page_entries(Mips_got_info<size, big_endian>* from); |
| 779 | |
| 780 | // Return GOT size. |
| 781 | unsigned int |
| 782 | got_size() const |
| 783 | { return ((2 + this->local_gotno_ + this->page_gotno_ + this->global_gotno_ |
| 784 | + this->tls_gotno_) * size/8); |
| 785 | } |
| 786 | |
| 787 | // Return the number of local GOT entries. |
| 788 | unsigned int |
| 789 | local_gotno() const |
| 790 | { return this->local_gotno_; } |
| 791 | |
| 792 | // Return the maximum number of page GOT entries needed. |
| 793 | unsigned int |
| 794 | page_gotno() const |
| 795 | { return this->page_gotno_; } |
| 796 | |
| 797 | // Return the number of global GOT entries. |
| 798 | unsigned int |
| 799 | global_gotno() const |
| 800 | { return this->global_gotno_; } |
| 801 | |
| 802 | // Set the number of global GOT entries. |
| 803 | void |
| 804 | set_global_gotno(unsigned int global_gotno) |
| 805 | { this->global_gotno_ = global_gotno; } |
| 806 | |
| 807 | // Return the number of GGA_RELOC_ONLY global GOT entries. |
| 808 | unsigned int |
| 809 | reloc_only_gotno() const |
| 810 | { return this->reloc_only_gotno_; } |
| 811 | |
| 812 | // Return the number of TLS GOT entries. |
| 813 | unsigned int |
| 814 | tls_gotno() const |
| 815 | { return this->tls_gotno_; } |
| 816 | |
| 817 | // Return the GOT type for this GOT. Used for multi-GOT links only. |
| 818 | unsigned int |
| 819 | multigot_got_type(unsigned int got_type) const |
| 820 | { |
| 821 | switch (got_type) |
| 822 | { |
| 823 | case GOT_TYPE_STANDARD: |
| 824 | return GOT_TYPE_STANDARD_MULTIGOT + this->index_; |
| 825 | case GOT_TYPE_TLS_OFFSET: |
| 826 | return GOT_TYPE_TLS_OFFSET_MULTIGOT + this->index_; |
| 827 | case GOT_TYPE_TLS_PAIR: |
| 828 | return GOT_TYPE_TLS_PAIR_MULTIGOT + this->index_; |
| 829 | default: |
| 830 | gold_unreachable(); |
| 831 | } |
| 832 | } |
| 833 | |
| 834 | // Remove lazy-binding stubs for global symbols in this GOT. |
| 835 | void |
| 836 | remove_lazy_stubs(Target_mips<size, big_endian>* target); |
| 837 | |
| 838 | // Return offset of this GOT from the start of .got section. |
| 839 | unsigned int |
| 840 | offset() const |
| 841 | { return this->offset_; } |
| 842 | |
| 843 | // Set offset of this GOT from the start of .got section. |
| 844 | void |
| 845 | set_offset(unsigned int offset) |
| 846 | { this->offset_ = offset; } |
| 847 | |
| 848 | // Set index of this GOT in multi-GOT links. |
| 849 | void |
| 850 | set_index(unsigned int index) |
| 851 | { this->index_ = index; } |
| 852 | |
| 853 | // Return next GOT in multi-GOT links. |
| 854 | Mips_got_info<size, big_endian>* |
| 855 | next() const |
| 856 | { return this->next_; } |
| 857 | |
| 858 | // Set next GOT in multi-GOT links. |
| 859 | void |
| 860 | set_next(Mips_got_info<size, big_endian>* next) |
| 861 | { this->next_ = next; } |
| 862 | |
| 863 | // Return the offset of TLS LDM entry for this GOT. |
| 864 | unsigned int |
| 865 | tls_ldm_offset() const |
| 866 | { return this->tls_ldm_offset_; } |
| 867 | |
| 868 | // Set the offset of TLS LDM entry for this GOT. |
| 869 | void |
| 870 | set_tls_ldm_offset(unsigned int tls_ldm_offset) |
| 871 | { this->tls_ldm_offset_ = tls_ldm_offset; } |
| 872 | |
| 873 | Global_got_entry_set& |
| 874 | global_got_symbols() |
| 875 | { return this->global_got_symbols_; } |
| 876 | |
| 877 | // Return the GOT_TLS_* type required by relocation type R_TYPE. |
| 878 | static int |
| 879 | mips_elf_reloc_tls_type(unsigned int r_type) |
| 880 | { |
| 881 | if (tls_gd_reloc(r_type)) |
| 882 | return GOT_TLS_GD; |
| 883 | |
| 884 | if (tls_ldm_reloc(r_type)) |
| 885 | return GOT_TLS_LDM; |
| 886 | |
| 887 | if (tls_gottprel_reloc(r_type)) |
| 888 | return GOT_TLS_IE; |
| 889 | |
| 890 | return GOT_TLS_NONE; |
| 891 | } |
| 892 | |
| 893 | // Return the number of GOT slots needed for GOT TLS type TYPE. |
| 894 | static int |
| 895 | mips_tls_got_entries(unsigned int type) |
| 896 | { |
| 897 | switch (type) |
| 898 | { |
| 899 | case GOT_TLS_GD: |
| 900 | case GOT_TLS_LDM: |
| 901 | return 2; |
| 902 | |
| 903 | case GOT_TLS_IE: |
| 904 | return 1; |
| 905 | |
| 906 | case GOT_TLS_NONE: |
| 907 | return 0; |
| 908 | |
| 909 | default: |
| 910 | gold_unreachable(); |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | private: |
| 915 | // The number of local GOT entries. |
| 916 | unsigned int local_gotno_; |
| 917 | // The maximum number of page GOT entries needed. |
| 918 | unsigned int page_gotno_; |
| 919 | // The number of global GOT entries. |
| 920 | unsigned int global_gotno_; |
| 921 | // The number of global GOT entries that are in the GGA_RELOC_ONLY area. |
| 922 | unsigned int reloc_only_gotno_; |
| 923 | // The number of TLS GOT entries. |
| 924 | unsigned int tls_gotno_; |
| 925 | // The offset of TLS LDM entry for this GOT. |
| 926 | unsigned int tls_ldm_offset_; |
| 927 | // All symbols that have global GOT entry. |
| 928 | Global_got_entry_set global_got_symbols_; |
| 929 | // A hash table holding GOT entries. |
| 930 | Got_entry_set got_entries_; |
| 931 | // A hash table of GOT page entries. |
| 932 | Got_page_entry_set got_page_entries_; |
| 933 | // The offset of first GOT page entry for this GOT. |
| 934 | unsigned int got_page_offset_start_; |
| 935 | // The offset of next available GOT page entry for this GOT. |
| 936 | unsigned int got_page_offset_next_; |
| 937 | // A hash table that maps GOT page entry value to the GOT offset where |
| 938 | // the entry is located. |
| 939 | Got_page_offsets got_page_offsets_; |
| 940 | // In multi-GOT links, a pointer to the next GOT. |
| 941 | Mips_got_info<size, big_endian>* next_; |
| 942 | // Index of this GOT in multi-GOT links. |
| 943 | unsigned int index_; |
| 944 | // The offset of this GOT in multi-GOT links. |
| 945 | unsigned int offset_; |
| 946 | }; |
| 947 | |
| 948 | // This is a helper class used during relocation scan. It records GOT16 addend. |
| 949 | |
| 950 | template<int size, bool big_endian> |
| 951 | struct got16_addend |
| 952 | { |
| 953 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 954 | |
| 955 | got16_addend(const Sized_relobj_file<size, big_endian>* _object, |
| 956 | unsigned int _shndx, unsigned int _r_type, unsigned int _r_sym, |
| 957 | Mips_address _addend) |
| 958 | : object(_object), shndx(_shndx), r_type(_r_type), r_sym(_r_sym), |
| 959 | addend(_addend) |
| 960 | { } |
| 961 | |
| 962 | const Sized_relobj_file<size, big_endian>* object; |
| 963 | unsigned int shndx; |
| 964 | unsigned int r_type; |
| 965 | unsigned int r_sym; |
| 966 | Mips_address addend; |
| 967 | }; |
| 968 | |
| 969 | // .MIPS.abiflags section content |
| 970 | |
| 971 | template<bool big_endian> |
| 972 | struct Mips_abiflags |
| 973 | { |
| 974 | typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype8; |
| 975 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype16; |
| 976 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype32; |
| 977 | |
| 978 | Mips_abiflags() |
| 979 | : version(0), isa_level(0), isa_rev(0), gpr_size(0), cpr1_size(0), |
| 980 | cpr2_size(0), fp_abi(0), isa_ext(0), ases(0), flags1(0), flags2(0) |
| 981 | { } |
| 982 | |
| 983 | // Version of flags structure. |
| 984 | Valtype16 version; |
| 985 | // The level of the ISA: 1-5, 32, 64. |
| 986 | Valtype8 isa_level; |
| 987 | // The revision of ISA: 0 for MIPS V and below, 1-n otherwise. |
| 988 | Valtype8 isa_rev; |
| 989 | // The size of general purpose registers. |
| 990 | Valtype8 gpr_size; |
| 991 | // The size of co-processor 1 registers. |
| 992 | Valtype8 cpr1_size; |
| 993 | // The size of co-processor 2 registers. |
| 994 | Valtype8 cpr2_size; |
| 995 | // The floating-point ABI. |
| 996 | Valtype8 fp_abi; |
| 997 | // Processor-specific extension. |
| 998 | Valtype32 isa_ext; |
| 999 | // Mask of ASEs used. |
| 1000 | Valtype32 ases; |
| 1001 | // Mask of general flags. |
| 1002 | Valtype32 flags1; |
| 1003 | Valtype32 flags2; |
| 1004 | }; |
| 1005 | |
| 1006 | // Mips_symbol class. Holds additional symbol information needed for Mips. |
| 1007 | |
| 1008 | template<int size> |
| 1009 | class Mips_symbol : public Sized_symbol<size> |
| 1010 | { |
| 1011 | public: |
| 1012 | Mips_symbol() |
| 1013 | : need_fn_stub_(false), has_nonpic_branches_(false), la25_stub_offset_(-1U), |
| 1014 | has_static_relocs_(false), no_lazy_stub_(false), lazy_stub_offset_(0), |
| 1015 | pointer_equality_needed_(false), global_got_area_(GGA_NONE), |
| 1016 | global_gotoffset_(-1U), got_only_for_calls_(true), has_lazy_stub_(false), |
| 1017 | needs_mips_plt_(false), needs_comp_plt_(false), mips_plt_offset_(-1U), |
| 1018 | comp_plt_offset_(-1U), mips16_fn_stub_(NULL), mips16_call_stub_(NULL), |
| 1019 | mips16_call_fp_stub_(NULL), applied_secondary_got_fixup_(false) |
| 1020 | { } |
| 1021 | |
| 1022 | // Return whether this is a MIPS16 symbol. |
| 1023 | bool |
| 1024 | is_mips16() const |
| 1025 | { |
| 1026 | // (st_other & STO_MIPS16) == STO_MIPS16 |
| 1027 | return ((this->nonvis() & (elfcpp::STO_MIPS16 >> 2)) |
| 1028 | == elfcpp::STO_MIPS16 >> 2); |
| 1029 | } |
| 1030 | |
| 1031 | // Return whether this is a microMIPS symbol. |
| 1032 | bool |
| 1033 | is_micromips() const |
| 1034 | { |
| 1035 | // (st_other & STO_MIPS_ISA) == STO_MICROMIPS |
| 1036 | return ((this->nonvis() & (elfcpp::STO_MIPS_ISA >> 2)) |
| 1037 | == elfcpp::STO_MICROMIPS >> 2); |
| 1038 | } |
| 1039 | |
| 1040 | // Return whether the symbol needs MIPS16 fn_stub. |
| 1041 | bool |
| 1042 | need_fn_stub() const |
| 1043 | { return this->need_fn_stub_; } |
| 1044 | |
| 1045 | // Set that the symbol needs MIPS16 fn_stub. |
| 1046 | void |
| 1047 | set_need_fn_stub() |
| 1048 | { this->need_fn_stub_ = true; } |
| 1049 | |
| 1050 | // Return whether this symbol is referenced by branch relocations from |
| 1051 | // any non-PIC input file. |
| 1052 | bool |
| 1053 | has_nonpic_branches() const |
| 1054 | { return this->has_nonpic_branches_; } |
| 1055 | |
| 1056 | // Set that this symbol is referenced by branch relocations from |
| 1057 | // any non-PIC input file. |
| 1058 | void |
| 1059 | set_has_nonpic_branches() |
| 1060 | { this->has_nonpic_branches_ = true; } |
| 1061 | |
| 1062 | // Return the offset of the la25 stub for this symbol from the start of the |
| 1063 | // la25 stub section. |
| 1064 | unsigned int |
| 1065 | la25_stub_offset() const |
| 1066 | { return this->la25_stub_offset_; } |
| 1067 | |
| 1068 | // Set the offset of the la25 stub for this symbol from the start of the |
| 1069 | // la25 stub section. |
| 1070 | void |
| 1071 | set_la25_stub_offset(unsigned int offset) |
| 1072 | { this->la25_stub_offset_ = offset; } |
| 1073 | |
| 1074 | // Return whether the symbol has la25 stub. This is true if this symbol is |
| 1075 | // for a PIC function, and there are non-PIC branches and jumps to it. |
| 1076 | bool |
| 1077 | has_la25_stub() const |
| 1078 | { return this->la25_stub_offset_ != -1U; } |
| 1079 | |
| 1080 | // Return whether there is a relocation against this symbol that must be |
| 1081 | // resolved by the static linker (that is, the relocation cannot possibly |
| 1082 | // be made dynamic). |
| 1083 | bool |
| 1084 | has_static_relocs() const |
| 1085 | { return this->has_static_relocs_; } |
| 1086 | |
| 1087 | // Set that there is a relocation against this symbol that must be resolved |
| 1088 | // by the static linker (that is, the relocation cannot possibly be made |
| 1089 | // dynamic). |
| 1090 | void |
| 1091 | set_has_static_relocs() |
| 1092 | { this->has_static_relocs_ = true; } |
| 1093 | |
| 1094 | // Return whether we must not create a lazy-binding stub for this symbol. |
| 1095 | bool |
| 1096 | no_lazy_stub() const |
| 1097 | { return this->no_lazy_stub_; } |
| 1098 | |
| 1099 | // Set that we must not create a lazy-binding stub for this symbol. |
| 1100 | void |
| 1101 | set_no_lazy_stub() |
| 1102 | { this->no_lazy_stub_ = true; } |
| 1103 | |
| 1104 | // Return the offset of the lazy-binding stub for this symbol from the start |
| 1105 | // of .MIPS.stubs section. |
| 1106 | unsigned int |
| 1107 | lazy_stub_offset() const |
| 1108 | { return this->lazy_stub_offset_; } |
| 1109 | |
| 1110 | // Set the offset of the lazy-binding stub for this symbol from the start |
| 1111 | // of .MIPS.stubs section. |
| 1112 | void |
| 1113 | set_lazy_stub_offset(unsigned int offset) |
| 1114 | { this->lazy_stub_offset_ = offset; } |
| 1115 | |
| 1116 | // Return whether there are any relocations for this symbol where |
| 1117 | // pointer equality matters. |
| 1118 | bool |
| 1119 | pointer_equality_needed() const |
| 1120 | { return this->pointer_equality_needed_; } |
| 1121 | |
| 1122 | // Set that there are relocations for this symbol where pointer equality |
| 1123 | // matters. |
| 1124 | void |
| 1125 | set_pointer_equality_needed() |
| 1126 | { this->pointer_equality_needed_ = true; } |
| 1127 | |
| 1128 | // Return global GOT area where this symbol in located. |
| 1129 | Global_got_area |
| 1130 | global_got_area() const |
| 1131 | { return this->global_got_area_; } |
| 1132 | |
| 1133 | // Set global GOT area where this symbol in located. |
| 1134 | void |
| 1135 | set_global_got_area(Global_got_area global_got_area) |
| 1136 | { this->global_got_area_ = global_got_area; } |
| 1137 | |
| 1138 | // Return the global GOT offset for this symbol. For multi-GOT links, this |
| 1139 | // returns the offset from the start of .got section to the first GOT entry |
| 1140 | // for the symbol. Note that in multi-GOT links the symbol can have entry |
| 1141 | // in more than one GOT. |
| 1142 | unsigned int |
| 1143 | global_gotoffset() const |
| 1144 | { return this->global_gotoffset_; } |
| 1145 | |
| 1146 | // Set the global GOT offset for this symbol. Note that in multi-GOT links |
| 1147 | // the symbol can have entry in more than one GOT. This method will set |
| 1148 | // the offset only if it is less than current offset. |
| 1149 | void |
| 1150 | set_global_gotoffset(unsigned int offset) |
| 1151 | { |
| 1152 | if (this->global_gotoffset_ == -1U || offset < this->global_gotoffset_) |
| 1153 | this->global_gotoffset_ = offset; |
| 1154 | } |
| 1155 | |
| 1156 | // Return whether all GOT relocations for this symbol are for calls. |
| 1157 | bool |
| 1158 | got_only_for_calls() const |
| 1159 | { return this->got_only_for_calls_; } |
| 1160 | |
| 1161 | // Set that there is a GOT relocation for this symbol that is not for call. |
| 1162 | void |
| 1163 | set_got_not_only_for_calls() |
| 1164 | { this->got_only_for_calls_ = false; } |
| 1165 | |
| 1166 | // Return whether this is a PIC symbol. |
| 1167 | bool |
| 1168 | is_pic() const |
| 1169 | { |
| 1170 | // (st_other & STO_MIPS_FLAGS) == STO_MIPS_PIC |
| 1171 | return ((this->nonvis() & (elfcpp::STO_MIPS_FLAGS >> 2)) |
| 1172 | == (elfcpp::STO_MIPS_PIC >> 2)); |
| 1173 | } |
| 1174 | |
| 1175 | // Set the flag in st_other field that marks this symbol as PIC. |
| 1176 | void |
| 1177 | set_pic() |
| 1178 | { |
| 1179 | if (this->is_mips16()) |
| 1180 | // (st_other & ~(STO_MIPS16 | STO_MIPS_FLAGS)) | STO_MIPS_PIC |
| 1181 | this->set_nonvis((this->nonvis() |
| 1182 | & ~((elfcpp::STO_MIPS16 >> 2) |
| 1183 | | (elfcpp::STO_MIPS_FLAGS >> 2))) |
| 1184 | | (elfcpp::STO_MIPS_PIC >> 2)); |
| 1185 | else |
| 1186 | // (other & ~STO_MIPS_FLAGS) | STO_MIPS_PIC |
| 1187 | this->set_nonvis((this->nonvis() & ~(elfcpp::STO_MIPS_FLAGS >> 2)) |
| 1188 | | (elfcpp::STO_MIPS_PIC >> 2)); |
| 1189 | } |
| 1190 | |
| 1191 | // Set the flag in st_other field that marks this symbol as PLT. |
| 1192 | void |
| 1193 | set_mips_plt() |
| 1194 | { |
| 1195 | if (this->is_mips16()) |
| 1196 | // (st_other & (STO_MIPS16 | ~STO_MIPS_FLAGS)) | STO_MIPS_PLT |
| 1197 | this->set_nonvis((this->nonvis() |
| 1198 | & ((elfcpp::STO_MIPS16 >> 2) |
| 1199 | | ~(elfcpp::STO_MIPS_FLAGS >> 2))) |
| 1200 | | (elfcpp::STO_MIPS_PLT >> 2)); |
| 1201 | |
| 1202 | else |
| 1203 | // (st_other & ~STO_MIPS_FLAGS) | STO_MIPS_PLT |
| 1204 | this->set_nonvis((this->nonvis() & ~(elfcpp::STO_MIPS_FLAGS >> 2)) |
| 1205 | | (elfcpp::STO_MIPS_PLT >> 2)); |
| 1206 | } |
| 1207 | |
| 1208 | // Downcast a base pointer to a Mips_symbol pointer. |
| 1209 | static Mips_symbol<size>* |
| 1210 | as_mips_sym(Symbol* sym) |
| 1211 | { return static_cast<Mips_symbol<size>*>(sym); } |
| 1212 | |
| 1213 | // Downcast a base pointer to a Mips_symbol pointer. |
| 1214 | static const Mips_symbol<size>* |
| 1215 | as_mips_sym(const Symbol* sym) |
| 1216 | { return static_cast<const Mips_symbol<size>*>(sym); } |
| 1217 | |
| 1218 | // Return whether the symbol has lazy-binding stub. |
| 1219 | bool |
| 1220 | has_lazy_stub() const |
| 1221 | { return this->has_lazy_stub_; } |
| 1222 | |
| 1223 | // Set whether the symbol has lazy-binding stub. |
| 1224 | void |
| 1225 | set_has_lazy_stub(bool has_lazy_stub) |
| 1226 | { this->has_lazy_stub_ = has_lazy_stub; } |
| 1227 | |
| 1228 | // Return whether the symbol needs a standard PLT entry. |
| 1229 | bool |
| 1230 | needs_mips_plt() const |
| 1231 | { return this->needs_mips_plt_; } |
| 1232 | |
| 1233 | // Set whether the symbol needs a standard PLT entry. |
| 1234 | void |
| 1235 | set_needs_mips_plt(bool needs_mips_plt) |
| 1236 | { this->needs_mips_plt_ = needs_mips_plt; } |
| 1237 | |
| 1238 | // Return whether the symbol needs a compressed (MIPS16 or microMIPS) PLT |
| 1239 | // entry. |
| 1240 | bool |
| 1241 | needs_comp_plt() const |
| 1242 | { return this->needs_comp_plt_; } |
| 1243 | |
| 1244 | // Set whether the symbol needs a compressed (MIPS16 or microMIPS) PLT entry. |
| 1245 | void |
| 1246 | set_needs_comp_plt(bool needs_comp_plt) |
| 1247 | { this->needs_comp_plt_ = needs_comp_plt; } |
| 1248 | |
| 1249 | // Return standard PLT entry offset, or -1 if none. |
| 1250 | unsigned int |
| 1251 | mips_plt_offset() const |
| 1252 | { return this->mips_plt_offset_; } |
| 1253 | |
| 1254 | // Set standard PLT entry offset. |
| 1255 | void |
| 1256 | set_mips_plt_offset(unsigned int mips_plt_offset) |
| 1257 | { this->mips_plt_offset_ = mips_plt_offset; } |
| 1258 | |
| 1259 | // Return whether the symbol has standard PLT entry. |
| 1260 | bool |
| 1261 | has_mips_plt_offset() const |
| 1262 | { return this->mips_plt_offset_ != -1U; } |
| 1263 | |
| 1264 | // Return compressed (MIPS16 or microMIPS) PLT entry offset, or -1 if none. |
| 1265 | unsigned int |
| 1266 | comp_plt_offset() const |
| 1267 | { return this->comp_plt_offset_; } |
| 1268 | |
| 1269 | // Set compressed (MIPS16 or microMIPS) PLT entry offset. |
| 1270 | void |
| 1271 | set_comp_plt_offset(unsigned int comp_plt_offset) |
| 1272 | { this->comp_plt_offset_ = comp_plt_offset; } |
| 1273 | |
| 1274 | // Return whether the symbol has compressed (MIPS16 or microMIPS) PLT entry. |
| 1275 | bool |
| 1276 | has_comp_plt_offset() const |
| 1277 | { return this->comp_plt_offset_ != -1U; } |
| 1278 | |
| 1279 | // Return MIPS16 fn stub for a symbol. |
| 1280 | template<bool big_endian> |
| 1281 | Mips16_stub_section<size, big_endian>* |
| 1282 | get_mips16_fn_stub() const |
| 1283 | { |
| 1284 | return static_cast<Mips16_stub_section<size, big_endian>*>(mips16_fn_stub_); |
| 1285 | } |
| 1286 | |
| 1287 | // Set MIPS16 fn stub for a symbol. |
| 1288 | void |
| 1289 | set_mips16_fn_stub(Mips16_stub_section_base* stub) |
| 1290 | { this->mips16_fn_stub_ = stub; } |
| 1291 | |
| 1292 | // Return whether symbol has MIPS16 fn stub. |
| 1293 | bool |
| 1294 | has_mips16_fn_stub() const |
| 1295 | { return this->mips16_fn_stub_ != NULL; } |
| 1296 | |
| 1297 | // Return MIPS16 call stub for a symbol. |
| 1298 | template<bool big_endian> |
| 1299 | Mips16_stub_section<size, big_endian>* |
| 1300 | get_mips16_call_stub() const |
| 1301 | { |
| 1302 | return static_cast<Mips16_stub_section<size, big_endian>*>( |
| 1303 | mips16_call_stub_); |
| 1304 | } |
| 1305 | |
| 1306 | // Set MIPS16 call stub for a symbol. |
| 1307 | void |
| 1308 | set_mips16_call_stub(Mips16_stub_section_base* stub) |
| 1309 | { this->mips16_call_stub_ = stub; } |
| 1310 | |
| 1311 | // Return whether symbol has MIPS16 call stub. |
| 1312 | bool |
| 1313 | has_mips16_call_stub() const |
| 1314 | { return this->mips16_call_stub_ != NULL; } |
| 1315 | |
| 1316 | // Return MIPS16 call_fp stub for a symbol. |
| 1317 | template<bool big_endian> |
| 1318 | Mips16_stub_section<size, big_endian>* |
| 1319 | get_mips16_call_fp_stub() const |
| 1320 | { |
| 1321 | return static_cast<Mips16_stub_section<size, big_endian>*>( |
| 1322 | mips16_call_fp_stub_); |
| 1323 | } |
| 1324 | |
| 1325 | // Set MIPS16 call_fp stub for a symbol. |
| 1326 | void |
| 1327 | set_mips16_call_fp_stub(Mips16_stub_section_base* stub) |
| 1328 | { this->mips16_call_fp_stub_ = stub; } |
| 1329 | |
| 1330 | // Return whether symbol has MIPS16 call_fp stub. |
| 1331 | bool |
| 1332 | has_mips16_call_fp_stub() const |
| 1333 | { return this->mips16_call_fp_stub_ != NULL; } |
| 1334 | |
| 1335 | bool |
| 1336 | get_applied_secondary_got_fixup() const |
| 1337 | { return applied_secondary_got_fixup_; } |
| 1338 | |
| 1339 | void |
| 1340 | set_applied_secondary_got_fixup() |
| 1341 | { this->applied_secondary_got_fixup_ = true; } |
| 1342 | |
| 1343 | // Return the hash of this symbol. |
| 1344 | size_t |
| 1345 | hash() const |
| 1346 | { |
| 1347 | return gold::string_hash<char>(this->name()); |
| 1348 | } |
| 1349 | |
| 1350 | private: |
| 1351 | // Whether the symbol needs MIPS16 fn_stub. This is true if this symbol |
| 1352 | // appears in any relocs other than a 16 bit call. |
| 1353 | bool need_fn_stub_; |
| 1354 | |
| 1355 | // True if this symbol is referenced by branch relocations from |
| 1356 | // any non-PIC input file. This is used to determine whether an |
| 1357 | // la25 stub is required. |
| 1358 | bool has_nonpic_branches_; |
| 1359 | |
| 1360 | // The offset of the la25 stub for this symbol from the start of the |
| 1361 | // la25 stub section. |
| 1362 | unsigned int la25_stub_offset_; |
| 1363 | |
| 1364 | // True if there is a relocation against this symbol that must be |
| 1365 | // resolved by the static linker (that is, the relocation cannot |
| 1366 | // possibly be made dynamic). |
| 1367 | bool has_static_relocs_; |
| 1368 | |
| 1369 | // Whether we must not create a lazy-binding stub for this symbol. |
| 1370 | // This is true if the symbol has relocations related to taking the |
| 1371 | // function's address. |
| 1372 | bool no_lazy_stub_; |
| 1373 | |
| 1374 | // The offset of the lazy-binding stub for this symbol from the start of |
| 1375 | // .MIPS.stubs section. |
| 1376 | unsigned int lazy_stub_offset_; |
| 1377 | |
| 1378 | // True if there are any relocations for this symbol where pointer equality |
| 1379 | // matters. |
| 1380 | bool pointer_equality_needed_; |
| 1381 | |
| 1382 | // Global GOT area where this symbol in located, or GGA_NONE if symbol is not |
| 1383 | // in the global part of the GOT. |
| 1384 | Global_got_area global_got_area_; |
| 1385 | |
| 1386 | // The global GOT offset for this symbol. For multi-GOT links, this is offset |
| 1387 | // from the start of .got section to the first GOT entry for the symbol. |
| 1388 | // Note that in multi-GOT links the symbol can have entry in more than one GOT. |
| 1389 | unsigned int global_gotoffset_; |
| 1390 | |
| 1391 | // Whether all GOT relocations for this symbol are for calls. |
| 1392 | bool got_only_for_calls_; |
| 1393 | // Whether the symbol has lazy-binding stub. |
| 1394 | bool has_lazy_stub_; |
| 1395 | // Whether the symbol needs a standard PLT entry. |
| 1396 | bool needs_mips_plt_; |
| 1397 | // Whether the symbol needs a compressed (MIPS16 or microMIPS) PLT entry. |
| 1398 | bool needs_comp_plt_; |
| 1399 | // Standard PLT entry offset, or -1 if none. |
| 1400 | unsigned int mips_plt_offset_; |
| 1401 | // Compressed (MIPS16 or microMIPS) PLT entry offset, or -1 if none. |
| 1402 | unsigned int comp_plt_offset_; |
| 1403 | // MIPS16 fn stub for a symbol. |
| 1404 | Mips16_stub_section_base* mips16_fn_stub_; |
| 1405 | // MIPS16 call stub for a symbol. |
| 1406 | Mips16_stub_section_base* mips16_call_stub_; |
| 1407 | // MIPS16 call_fp stub for a symbol. |
| 1408 | Mips16_stub_section_base* mips16_call_fp_stub_; |
| 1409 | |
| 1410 | bool applied_secondary_got_fixup_; |
| 1411 | }; |
| 1412 | |
| 1413 | // Mips16_stub_section class. |
| 1414 | |
| 1415 | // The mips16 compiler uses a couple of special sections to handle |
| 1416 | // floating point arguments. |
| 1417 | |
| 1418 | // Section names that look like .mips16.fn.FNNAME contain stubs that |
| 1419 | // copy floating point arguments from the fp regs to the gp regs and |
| 1420 | // then jump to FNNAME. If any 32 bit function calls FNNAME, the |
| 1421 | // call should be redirected to the stub instead. If no 32 bit |
| 1422 | // function calls FNNAME, the stub should be discarded. We need to |
| 1423 | // consider any reference to the function, not just a call, because |
| 1424 | // if the address of the function is taken we will need the stub, |
| 1425 | // since the address might be passed to a 32 bit function. |
| 1426 | |
| 1427 | // Section names that look like .mips16.call.FNNAME contain stubs |
| 1428 | // that copy floating point arguments from the gp regs to the fp |
| 1429 | // regs and then jump to FNNAME. If FNNAME is a 32 bit function, |
| 1430 | // then any 16 bit function that calls FNNAME should be redirected |
| 1431 | // to the stub instead. If FNNAME is not a 32 bit function, the |
| 1432 | // stub should be discarded. |
| 1433 | |
| 1434 | // .mips16.call.fp.FNNAME sections are similar, but contain stubs |
| 1435 | // which call FNNAME and then copy the return value from the fp regs |
| 1436 | // to the gp regs. These stubs store the return address in $18 while |
| 1437 | // calling FNNAME; any function which might call one of these stubs |
| 1438 | // must arrange to save $18 around the call. (This case is not |
| 1439 | // needed for 32 bit functions that call 16 bit functions, because |
| 1440 | // 16 bit functions always return floating point values in both |
| 1441 | // $f0/$f1 and $2/$3.) |
| 1442 | |
| 1443 | // Note that in all cases FNNAME might be defined statically. |
| 1444 | // Therefore, FNNAME is not used literally. Instead, the relocation |
| 1445 | // information will indicate which symbol the section is for. |
| 1446 | |
| 1447 | // We record any stubs that we find in the symbol table. |
| 1448 | |
| 1449 | // TODO(sasa): All mips16 stub sections should be emitted in the .text section. |
| 1450 | |
| 1451 | class Mips16_stub_section_base { }; |
| 1452 | |
| 1453 | template<int size, bool big_endian> |
| 1454 | class Mips16_stub_section : public Mips16_stub_section_base |
| 1455 | { |
| 1456 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 1457 | |
| 1458 | public: |
| 1459 | Mips16_stub_section(Mips_relobj<size, big_endian>* object, unsigned int shndx) |
| 1460 | : object_(object), shndx_(shndx), r_sym_(0), gsym_(NULL), |
| 1461 | found_r_mips_none_(false) |
| 1462 | { |
| 1463 | gold_assert(object->is_mips16_fn_stub_section(shndx) |
| 1464 | || object->is_mips16_call_stub_section(shndx) |
| 1465 | || object->is_mips16_call_fp_stub_section(shndx)); |
| 1466 | } |
| 1467 | |
| 1468 | // Return the object of this stub section. |
| 1469 | Mips_relobj<size, big_endian>* |
| 1470 | object() const |
| 1471 | { return this->object_; } |
| 1472 | |
| 1473 | // Return the size of a section. |
| 1474 | uint64_t |
| 1475 | section_size() const |
| 1476 | { return this->object_->section_size(this->shndx_); } |
| 1477 | |
| 1478 | // Return section index of this stub section. |
| 1479 | unsigned int |
| 1480 | shndx() const |
| 1481 | { return this->shndx_; } |
| 1482 | |
| 1483 | // Return symbol index, if stub is for a local function. |
| 1484 | unsigned int |
| 1485 | r_sym() const |
| 1486 | { return this->r_sym_; } |
| 1487 | |
| 1488 | // Return symbol, if stub is for a global function. |
| 1489 | Mips_symbol<size>* |
| 1490 | gsym() const |
| 1491 | { return this->gsym_; } |
| 1492 | |
| 1493 | // Return whether stub is for a local function. |
| 1494 | bool |
| 1495 | is_for_local_function() const |
| 1496 | { return this->gsym_ == NULL; } |
| 1497 | |
| 1498 | // This method is called when a new relocation R_TYPE for local symbol R_SYM |
| 1499 | // is found in the stub section. Try to find stub target. |
| 1500 | void |
| 1501 | new_local_reloc_found(unsigned int r_type, unsigned int r_sym) |
| 1502 | { |
| 1503 | // To find target symbol for this stub, trust the first R_MIPS_NONE |
| 1504 | // relocation, if any. Otherwise trust the first relocation, whatever |
| 1505 | // its kind. |
| 1506 | if (this->found_r_mips_none_) |
| 1507 | return; |
| 1508 | if (r_type == elfcpp::R_MIPS_NONE) |
| 1509 | { |
| 1510 | this->r_sym_ = r_sym; |
| 1511 | this->gsym_ = NULL; |
| 1512 | this->found_r_mips_none_ = true; |
| 1513 | } |
| 1514 | else if (!is_target_found()) |
| 1515 | this->r_sym_ = r_sym; |
| 1516 | } |
| 1517 | |
| 1518 | // This method is called when a new relocation R_TYPE for global symbol GSYM |
| 1519 | // is found in the stub section. Try to find stub target. |
| 1520 | void |
| 1521 | new_global_reloc_found(unsigned int r_type, Mips_symbol<size>* gsym) |
| 1522 | { |
| 1523 | // To find target symbol for this stub, trust the first R_MIPS_NONE |
| 1524 | // relocation, if any. Otherwise trust the first relocation, whatever |
| 1525 | // its kind. |
| 1526 | if (this->found_r_mips_none_) |
| 1527 | return; |
| 1528 | if (r_type == elfcpp::R_MIPS_NONE) |
| 1529 | { |
| 1530 | this->gsym_ = gsym; |
| 1531 | this->r_sym_ = 0; |
| 1532 | this->found_r_mips_none_ = true; |
| 1533 | } |
| 1534 | else if (!is_target_found()) |
| 1535 | this->gsym_ = gsym; |
| 1536 | } |
| 1537 | |
| 1538 | // Return whether we found the stub target. |
| 1539 | bool |
| 1540 | is_target_found() const |
| 1541 | { return this->r_sym_ != 0 || this->gsym_ != NULL; } |
| 1542 | |
| 1543 | // Return whether this is a fn stub. |
| 1544 | bool |
| 1545 | is_fn_stub() const |
| 1546 | { return this->object_->is_mips16_fn_stub_section(this->shndx_); } |
| 1547 | |
| 1548 | // Return whether this is a call stub. |
| 1549 | bool |
| 1550 | is_call_stub() const |
| 1551 | { return this->object_->is_mips16_call_stub_section(this->shndx_); } |
| 1552 | |
| 1553 | // Return whether this is a call_fp stub. |
| 1554 | bool |
| 1555 | is_call_fp_stub() const |
| 1556 | { return this->object_->is_mips16_call_fp_stub_section(this->shndx_); } |
| 1557 | |
| 1558 | // Return the output address. |
| 1559 | Mips_address |
| 1560 | output_address() const |
| 1561 | { |
| 1562 | return (this->object_->output_section(this->shndx_)->address() |
| 1563 | + this->object_->output_section_offset(this->shndx_)); |
| 1564 | } |
| 1565 | |
| 1566 | private: |
| 1567 | // The object of this stub section. |
| 1568 | Mips_relobj<size, big_endian>* object_; |
| 1569 | // The section index of this stub section. |
| 1570 | unsigned int shndx_; |
| 1571 | // The symbol index, if stub is for a local function. |
| 1572 | unsigned int r_sym_; |
| 1573 | // The symbol, if stub is for a global function. |
| 1574 | Mips_symbol<size>* gsym_; |
| 1575 | // True if we found R_MIPS_NONE relocation in this stub. |
| 1576 | bool found_r_mips_none_; |
| 1577 | }; |
| 1578 | |
| 1579 | // Mips_relobj class. |
| 1580 | |
| 1581 | template<int size, bool big_endian> |
| 1582 | class Mips_relobj : public Sized_relobj_file<size, big_endian> |
| 1583 | { |
| 1584 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 1585 | typedef std::map<unsigned int, Mips16_stub_section<size, big_endian>*> |
| 1586 | Mips16_stubs_int_map; |
| 1587 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| 1588 | |
| 1589 | public: |
| 1590 | Mips_relobj(const std::string& name, Input_file* input_file, off_t offset, |
| 1591 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| 1592 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), |
| 1593 | processor_specific_flags_(0), local_symbol_is_mips16_(), |
| 1594 | local_symbol_is_micromips_(), mips16_stub_sections_(), |
| 1595 | local_non_16bit_calls_(), local_16bit_calls_(), local_mips16_fn_stubs_(), |
| 1596 | local_mips16_call_stubs_(), gp_(0), has_reginfo_section_(false), |
| 1597 | merge_processor_specific_data_(true), got_info_(NULL), |
| 1598 | section_is_mips16_fn_stub_(), section_is_mips16_call_stub_(), |
| 1599 | section_is_mips16_call_fp_stub_(), pdr_shndx_(-1U), |
| 1600 | attributes_section_data_(NULL), abiflags_(NULL), gprmask_(0), |
| 1601 | cprmask1_(0), cprmask2_(0), cprmask3_(0), cprmask4_(0) |
| 1602 | { |
| 1603 | this->is_pic_ = (ehdr.get_e_flags() & elfcpp::EF_MIPS_PIC) != 0; |
| 1604 | this->is_n32_ = elfcpp::abi_n32(ehdr.get_e_flags()); |
| 1605 | } |
| 1606 | |
| 1607 | ~Mips_relobj() |
| 1608 | { delete this->attributes_section_data_; } |
| 1609 | |
| 1610 | // Downcast a base pointer to a Mips_relobj pointer. This is |
| 1611 | // not type-safe but we only use Mips_relobj not the base class. |
| 1612 | static Mips_relobj<size, big_endian>* |
| 1613 | as_mips_relobj(Relobj* relobj) |
| 1614 | { return static_cast<Mips_relobj<size, big_endian>*>(relobj); } |
| 1615 | |
| 1616 | // Downcast a base pointer to a Mips_relobj pointer. This is |
| 1617 | // not type-safe but we only use Mips_relobj not the base class. |
| 1618 | static const Mips_relobj<size, big_endian>* |
| 1619 | as_mips_relobj(const Relobj* relobj) |
| 1620 | { return static_cast<const Mips_relobj<size, big_endian>*>(relobj); } |
| 1621 | |
| 1622 | // Processor-specific flags in ELF file header. This is valid only after |
| 1623 | // reading symbols. |
| 1624 | elfcpp::Elf_Word |
| 1625 | processor_specific_flags() const |
| 1626 | { return this->processor_specific_flags_; } |
| 1627 | |
| 1628 | // Whether a local symbol is MIPS16 symbol. R_SYM is the symbol table |
| 1629 | // index. This is only valid after do_count_local_symbol is called. |
| 1630 | bool |
| 1631 | local_symbol_is_mips16(unsigned int r_sym) const |
| 1632 | { |
| 1633 | gold_assert(r_sym < this->local_symbol_is_mips16_.size()); |
| 1634 | return this->local_symbol_is_mips16_[r_sym]; |
| 1635 | } |
| 1636 | |
| 1637 | // Whether a local symbol is microMIPS symbol. R_SYM is the symbol table |
| 1638 | // index. This is only valid after do_count_local_symbol is called. |
| 1639 | bool |
| 1640 | local_symbol_is_micromips(unsigned int r_sym) const |
| 1641 | { |
| 1642 | gold_assert(r_sym < this->local_symbol_is_micromips_.size()); |
| 1643 | return this->local_symbol_is_micromips_[r_sym]; |
| 1644 | } |
| 1645 | |
| 1646 | // Get or create MIPS16 stub section. |
| 1647 | Mips16_stub_section<size, big_endian>* |
| 1648 | get_mips16_stub_section(unsigned int shndx) |
| 1649 | { |
| 1650 | typename Mips16_stubs_int_map::const_iterator it = |
| 1651 | this->mips16_stub_sections_.find(shndx); |
| 1652 | if (it != this->mips16_stub_sections_.end()) |
| 1653 | return (*it).second; |
| 1654 | |
| 1655 | Mips16_stub_section<size, big_endian>* stub_section = |
| 1656 | new Mips16_stub_section<size, big_endian>(this, shndx); |
| 1657 | this->mips16_stub_sections_.insert( |
| 1658 | std::pair<unsigned int, Mips16_stub_section<size, big_endian>*>( |
| 1659 | stub_section->shndx(), stub_section)); |
| 1660 | return stub_section; |
| 1661 | } |
| 1662 | |
| 1663 | // Return MIPS16 fn stub section for local symbol R_SYM, or NULL if this |
| 1664 | // object doesn't have fn stub for R_SYM. |
| 1665 | Mips16_stub_section<size, big_endian>* |
| 1666 | get_local_mips16_fn_stub(unsigned int r_sym) const |
| 1667 | { |
| 1668 | typename Mips16_stubs_int_map::const_iterator it = |
| 1669 | this->local_mips16_fn_stubs_.find(r_sym); |
| 1670 | if (it != this->local_mips16_fn_stubs_.end()) |
| 1671 | return (*it).second; |
| 1672 | return NULL; |
| 1673 | } |
| 1674 | |
| 1675 | // Record that this object has MIPS16 fn stub for local symbol. This method |
| 1676 | // is only called if we decided not to discard the stub. |
| 1677 | void |
| 1678 | add_local_mips16_fn_stub(Mips16_stub_section<size, big_endian>* stub) |
| 1679 | { |
| 1680 | gold_assert(stub->is_for_local_function()); |
| 1681 | unsigned int r_sym = stub->r_sym(); |
| 1682 | this->local_mips16_fn_stubs_.insert( |
| 1683 | std::pair<unsigned int, Mips16_stub_section<size, big_endian>*>( |
| 1684 | r_sym, stub)); |
| 1685 | } |
| 1686 | |
| 1687 | // Return MIPS16 call stub section for local symbol R_SYM, or NULL if this |
| 1688 | // object doesn't have call stub for R_SYM. |
| 1689 | Mips16_stub_section<size, big_endian>* |
| 1690 | get_local_mips16_call_stub(unsigned int r_sym) const |
| 1691 | { |
| 1692 | typename Mips16_stubs_int_map::const_iterator it = |
| 1693 | this->local_mips16_call_stubs_.find(r_sym); |
| 1694 | if (it != this->local_mips16_call_stubs_.end()) |
| 1695 | return (*it).second; |
| 1696 | return NULL; |
| 1697 | } |
| 1698 | |
| 1699 | // Record that this object has MIPS16 call stub for local symbol. This method |
| 1700 | // is only called if we decided not to discard the stub. |
| 1701 | void |
| 1702 | add_local_mips16_call_stub(Mips16_stub_section<size, big_endian>* stub) |
| 1703 | { |
| 1704 | gold_assert(stub->is_for_local_function()); |
| 1705 | unsigned int r_sym = stub->r_sym(); |
| 1706 | this->local_mips16_call_stubs_.insert( |
| 1707 | std::pair<unsigned int, Mips16_stub_section<size, big_endian>*>( |
| 1708 | r_sym, stub)); |
| 1709 | } |
| 1710 | |
| 1711 | // Record that we found "non 16-bit" call relocation against local symbol |
| 1712 | // SYMNDX. This reloc would need to refer to a MIPS16 fn stub, if there |
| 1713 | // is one. |
| 1714 | void |
| 1715 | add_local_non_16bit_call(unsigned int symndx) |
| 1716 | { this->local_non_16bit_calls_.insert(symndx); } |
| 1717 | |
| 1718 | // Return true if there is any "non 16-bit" call relocation against local |
| 1719 | // symbol SYMNDX in this object. |
| 1720 | bool |
| 1721 | has_local_non_16bit_call_relocs(unsigned int symndx) |
| 1722 | { |
| 1723 | return (this->local_non_16bit_calls_.find(symndx) |
| 1724 | != this->local_non_16bit_calls_.end()); |
| 1725 | } |
| 1726 | |
| 1727 | // Record that we found 16-bit call relocation R_MIPS16_26 against local |
| 1728 | // symbol SYMNDX. Local MIPS16 call or call_fp stubs will only be needed |
| 1729 | // if there is some R_MIPS16_26 relocation that refers to the stub symbol. |
| 1730 | void |
| 1731 | add_local_16bit_call(unsigned int symndx) |
| 1732 | { this->local_16bit_calls_.insert(symndx); } |
| 1733 | |
| 1734 | // Return true if there is any 16-bit call relocation R_MIPS16_26 against local |
| 1735 | // symbol SYMNDX in this object. |
| 1736 | bool |
| 1737 | has_local_16bit_call_relocs(unsigned int symndx) |
| 1738 | { |
| 1739 | return (this->local_16bit_calls_.find(symndx) |
| 1740 | != this->local_16bit_calls_.end()); |
| 1741 | } |
| 1742 | |
| 1743 | // Get gp value that was used to create this object. |
| 1744 | Mips_address |
| 1745 | gp_value() const |
| 1746 | { return this->gp_; } |
| 1747 | |
| 1748 | // Return whether the object is a PIC object. |
| 1749 | bool |
| 1750 | is_pic() const |
| 1751 | { return this->is_pic_; } |
| 1752 | |
| 1753 | // Return whether the object uses N32 ABI. |
| 1754 | bool |
| 1755 | is_n32() const |
| 1756 | { return this->is_n32_; } |
| 1757 | |
| 1758 | // Return whether the object uses N64 ABI. |
| 1759 | bool |
| 1760 | is_n64() const |
| 1761 | { return size == 64; } |
| 1762 | |
| 1763 | // Return whether the object uses NewABI conventions. |
| 1764 | bool |
| 1765 | is_newabi() const |
| 1766 | { return this->is_n32() || this->is_n64(); } |
| 1767 | |
| 1768 | // Return Mips_got_info for this object. |
| 1769 | Mips_got_info<size, big_endian>* |
| 1770 | get_got_info() const |
| 1771 | { return this->got_info_; } |
| 1772 | |
| 1773 | // Return Mips_got_info for this object. Create new info if it doesn't exist. |
| 1774 | Mips_got_info<size, big_endian>* |
| 1775 | get_or_create_got_info() |
| 1776 | { |
| 1777 | if (!this->got_info_) |
| 1778 | this->got_info_ = new Mips_got_info<size, big_endian>(); |
| 1779 | return this->got_info_; |
| 1780 | } |
| 1781 | |
| 1782 | // Set Mips_got_info for this object. |
| 1783 | void |
| 1784 | set_got_info(Mips_got_info<size, big_endian>* got_info) |
| 1785 | { this->got_info_ = got_info; } |
| 1786 | |
| 1787 | // Whether a section SHDNX is a MIPS16 stub section. This is only valid |
| 1788 | // after do_read_symbols is called. |
| 1789 | bool |
| 1790 | is_mips16_stub_section(unsigned int shndx) |
| 1791 | { |
| 1792 | return (is_mips16_fn_stub_section(shndx) |
| 1793 | || is_mips16_call_stub_section(shndx) |
| 1794 | || is_mips16_call_fp_stub_section(shndx)); |
| 1795 | } |
| 1796 | |
| 1797 | // Return TRUE if relocations in section SHNDX can refer directly to a |
| 1798 | // MIPS16 function rather than to a hard-float stub. This is only valid |
| 1799 | // after do_read_symbols is called. |
| 1800 | bool |
| 1801 | section_allows_mips16_refs(unsigned int shndx) |
| 1802 | { |
| 1803 | return (this->is_mips16_stub_section(shndx) || shndx == this->pdr_shndx_); |
| 1804 | } |
| 1805 | |
| 1806 | // Whether a section SHDNX is a MIPS16 fn stub section. This is only valid |
| 1807 | // after do_read_symbols is called. |
| 1808 | bool |
| 1809 | is_mips16_fn_stub_section(unsigned int shndx) |
| 1810 | { |
| 1811 | gold_assert(shndx < this->section_is_mips16_fn_stub_.size()); |
| 1812 | return this->section_is_mips16_fn_stub_[shndx]; |
| 1813 | } |
| 1814 | |
| 1815 | // Whether a section SHDNX is a MIPS16 call stub section. This is only valid |
| 1816 | // after do_read_symbols is called. |
| 1817 | bool |
| 1818 | is_mips16_call_stub_section(unsigned int shndx) |
| 1819 | { |
| 1820 | gold_assert(shndx < this->section_is_mips16_call_stub_.size()); |
| 1821 | return this->section_is_mips16_call_stub_[shndx]; |
| 1822 | } |
| 1823 | |
| 1824 | // Whether a section SHDNX is a MIPS16 call_fp stub section. This is only |
| 1825 | // valid after do_read_symbols is called. |
| 1826 | bool |
| 1827 | is_mips16_call_fp_stub_section(unsigned int shndx) |
| 1828 | { |
| 1829 | gold_assert(shndx < this->section_is_mips16_call_fp_stub_.size()); |
| 1830 | return this->section_is_mips16_call_fp_stub_[shndx]; |
| 1831 | } |
| 1832 | |
| 1833 | // Discard MIPS16 stub secions that are not needed. |
| 1834 | void |
| 1835 | discard_mips16_stub_sections(Symbol_table* symtab); |
| 1836 | |
| 1837 | // Return whether there is a .reginfo section. |
| 1838 | bool |
| 1839 | has_reginfo_section() const |
| 1840 | { return this->has_reginfo_section_; } |
| 1841 | |
| 1842 | // Return whether we want to merge processor-specific data. |
| 1843 | bool |
| 1844 | merge_processor_specific_data() const |
| 1845 | { return this->merge_processor_specific_data_; } |
| 1846 | |
| 1847 | // Return gprmask from the .reginfo section of this object. |
| 1848 | Valtype |
| 1849 | gprmask() const |
| 1850 | { return this->gprmask_; } |
| 1851 | |
| 1852 | // Return cprmask1 from the .reginfo section of this object. |
| 1853 | Valtype |
| 1854 | cprmask1() const |
| 1855 | { return this->cprmask1_; } |
| 1856 | |
| 1857 | // Return cprmask2 from the .reginfo section of this object. |
| 1858 | Valtype |
| 1859 | cprmask2() const |
| 1860 | { return this->cprmask2_; } |
| 1861 | |
| 1862 | // Return cprmask3 from the .reginfo section of this object. |
| 1863 | Valtype |
| 1864 | cprmask3() const |
| 1865 | { return this->cprmask3_; } |
| 1866 | |
| 1867 | // Return cprmask4 from the .reginfo section of this object. |
| 1868 | Valtype |
| 1869 | cprmask4() const |
| 1870 | { return this->cprmask4_; } |
| 1871 | |
| 1872 | // This is the contents of the .MIPS.abiflags section if there is one. |
| 1873 | Mips_abiflags<big_endian>* |
| 1874 | abiflags() |
| 1875 | { return this->abiflags_; } |
| 1876 | |
| 1877 | // This is the contents of the .gnu.attribute section if there is one. |
| 1878 | const Attributes_section_data* |
| 1879 | attributes_section_data() const |
| 1880 | { return this->attributes_section_data_; } |
| 1881 | |
| 1882 | protected: |
| 1883 | // Count the local symbols. |
| 1884 | void |
| 1885 | do_count_local_symbols(Stringpool_template<char>*, |
| 1886 | Stringpool_template<char>*); |
| 1887 | |
| 1888 | // Read the symbol information. |
| 1889 | void |
| 1890 | do_read_symbols(Read_symbols_data* sd); |
| 1891 | |
| 1892 | private: |
| 1893 | // The name of the options section. |
| 1894 | const char* mips_elf_options_section_name() |
| 1895 | { return this->is_newabi() ? ".MIPS.options" : ".options"; } |
| 1896 | |
| 1897 | // processor-specific flags in ELF file header. |
| 1898 | elfcpp::Elf_Word processor_specific_flags_; |
| 1899 | |
| 1900 | // Bit vector to tell if a local symbol is a MIPS16 symbol or not. |
| 1901 | // This is only valid after do_count_local_symbol is called. |
| 1902 | std::vector<bool> local_symbol_is_mips16_; |
| 1903 | |
| 1904 | // Bit vector to tell if a local symbol is a microMIPS symbol or not. |
| 1905 | // This is only valid after do_count_local_symbol is called. |
| 1906 | std::vector<bool> local_symbol_is_micromips_; |
| 1907 | |
| 1908 | // Map from section index to the MIPS16 stub for that section. This contains |
| 1909 | // all stubs found in this object. |
| 1910 | Mips16_stubs_int_map mips16_stub_sections_; |
| 1911 | |
| 1912 | // Local symbols that have "non 16-bit" call relocation. This relocation |
| 1913 | // would need to refer to a MIPS16 fn stub, if there is one. |
| 1914 | std::set<unsigned int> local_non_16bit_calls_; |
| 1915 | |
| 1916 | // Local symbols that have 16-bit call relocation R_MIPS16_26. Local MIPS16 |
| 1917 | // call or call_fp stubs will only be needed if there is some R_MIPS16_26 |
| 1918 | // relocation that refers to the stub symbol. |
| 1919 | std::set<unsigned int> local_16bit_calls_; |
| 1920 | |
| 1921 | // Map from local symbol index to the MIPS16 fn stub for that symbol. |
| 1922 | // This contains only the stubs that we decided not to discard. |
| 1923 | Mips16_stubs_int_map local_mips16_fn_stubs_; |
| 1924 | |
| 1925 | // Map from local symbol index to the MIPS16 call stub for that symbol. |
| 1926 | // This contains only the stubs that we decided not to discard. |
| 1927 | Mips16_stubs_int_map local_mips16_call_stubs_; |
| 1928 | |
| 1929 | // gp value that was used to create this object. |
| 1930 | Mips_address gp_; |
| 1931 | // Whether the object is a PIC object. |
| 1932 | bool is_pic_ : 1; |
| 1933 | // Whether the object uses N32 ABI. |
| 1934 | bool is_n32_ : 1; |
| 1935 | // Whether the object contains a .reginfo section. |
| 1936 | bool has_reginfo_section_ : 1; |
| 1937 | // Whether we merge processor-specific data of this object to output. |
| 1938 | bool merge_processor_specific_data_ : 1; |
| 1939 | // The Mips_got_info for this object. |
| 1940 | Mips_got_info<size, big_endian>* got_info_; |
| 1941 | |
| 1942 | // Bit vector to tell if a section is a MIPS16 fn stub section or not. |
| 1943 | // This is only valid after do_read_symbols is called. |
| 1944 | std::vector<bool> section_is_mips16_fn_stub_; |
| 1945 | |
| 1946 | // Bit vector to tell if a section is a MIPS16 call stub section or not. |
| 1947 | // This is only valid after do_read_symbols is called. |
| 1948 | std::vector<bool> section_is_mips16_call_stub_; |
| 1949 | |
| 1950 | // Bit vector to tell if a section is a MIPS16 call_fp stub section or not. |
| 1951 | // This is only valid after do_read_symbols is called. |
| 1952 | std::vector<bool> section_is_mips16_call_fp_stub_; |
| 1953 | |
| 1954 | // .pdr section index. |
| 1955 | unsigned int pdr_shndx_; |
| 1956 | |
| 1957 | // Object attributes if there is a .gnu.attributes section or NULL. |
| 1958 | Attributes_section_data* attributes_section_data_; |
| 1959 | |
| 1960 | // Object abiflags if there is a .MIPS.abiflags section or NULL. |
| 1961 | Mips_abiflags<big_endian>* abiflags_; |
| 1962 | |
| 1963 | // gprmask from the .reginfo section of this object. |
| 1964 | Valtype gprmask_; |
| 1965 | // cprmask1 from the .reginfo section of this object. |
| 1966 | Valtype cprmask1_; |
| 1967 | // cprmask2 from the .reginfo section of this object. |
| 1968 | Valtype cprmask2_; |
| 1969 | // cprmask3 from the .reginfo section of this object. |
| 1970 | Valtype cprmask3_; |
| 1971 | // cprmask4 from the .reginfo section of this object. |
| 1972 | Valtype cprmask4_; |
| 1973 | }; |
| 1974 | |
| 1975 | // Mips_output_data_got class. |
| 1976 | |
| 1977 | template<int size, bool big_endian> |
| 1978 | class Mips_output_data_got : public Output_data_got<size, big_endian> |
| 1979 | { |
| 1980 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 1981 | typedef Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> |
| 1982 | Reloc_section; |
| 1983 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| 1984 | |
| 1985 | public: |
| 1986 | Mips_output_data_got(Target_mips<size, big_endian>* target, |
| 1987 | Symbol_table* symtab, Layout* layout) |
| 1988 | : Output_data_got<size, big_endian>(), target_(target), |
| 1989 | symbol_table_(symtab), layout_(layout), static_relocs_(), got_view_(NULL), |
| 1990 | first_global_got_dynsym_index_(-1U), primary_got_(NULL), |
| 1991 | secondary_got_relocs_() |
| 1992 | { |
| 1993 | this->master_got_info_ = new Mips_got_info<size, big_endian>(); |
| 1994 | this->set_addralign(16); |
| 1995 | } |
| 1996 | |
| 1997 | // Reserve GOT entry for a GOT relocation of type R_TYPE against symbol |
| 1998 | // SYMNDX + ADDEND, where SYMNDX is a local symbol in section SHNDX in OBJECT. |
| 1999 | void |
| 2000 | record_local_got_symbol(Mips_relobj<size, big_endian>* object, |
| 2001 | unsigned int symndx, Mips_address addend, |
| 2002 | unsigned int r_type, unsigned int shndx, |
| 2003 | bool is_section_symbol) |
| 2004 | { |
| 2005 | this->master_got_info_->record_local_got_symbol(object, symndx, addend, |
| 2006 | r_type, shndx, |
| 2007 | is_section_symbol); |
| 2008 | } |
| 2009 | |
| 2010 | // Reserve GOT entry for a GOT relocation of type R_TYPE against MIPS_SYM, |
| 2011 | // in OBJECT. FOR_CALL is true if the caller is only interested in |
| 2012 | // using the GOT entry for calls. DYN_RELOC is true if R_TYPE is a dynamic |
| 2013 | // relocation. |
| 2014 | void |
| 2015 | record_global_got_symbol(Mips_symbol<size>* mips_sym, |
| 2016 | Mips_relobj<size, big_endian>* object, |
| 2017 | unsigned int r_type, bool dyn_reloc, bool for_call) |
| 2018 | { |
| 2019 | this->master_got_info_->record_global_got_symbol(mips_sym, object, r_type, |
| 2020 | dyn_reloc, for_call); |
| 2021 | } |
| 2022 | |
| 2023 | // Record that OBJECT has a page relocation against symbol SYMNDX and |
| 2024 | // that ADDEND is the addend for that relocation. |
| 2025 | void |
| 2026 | record_got_page_entry(Mips_relobj<size, big_endian>* object, |
| 2027 | unsigned int symndx, int addend) |
| 2028 | { this->master_got_info_->record_got_page_entry(object, symndx, addend); } |
| 2029 | |
| 2030 | // Add a static entry for the GOT entry at OFFSET. GSYM is a global |
| 2031 | // symbol and R_TYPE is the code of a dynamic relocation that needs to be |
| 2032 | // applied in a static link. |
| 2033 | void |
| 2034 | add_static_reloc(unsigned int got_offset, unsigned int r_type, |
| 2035 | Mips_symbol<size>* gsym) |
| 2036 | { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); } |
| 2037 | |
| 2038 | // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object |
| 2039 | // defining a local symbol with INDEX. R_TYPE is the code of a dynamic |
| 2040 | // relocation that needs to be applied in a static link. |
| 2041 | void |
| 2042 | add_static_reloc(unsigned int got_offset, unsigned int r_type, |
| 2043 | Sized_relobj_file<size, big_endian>* relobj, |
| 2044 | unsigned int index) |
| 2045 | { |
| 2046 | this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj, |
| 2047 | index)); |
| 2048 | } |
| 2049 | |
| 2050 | // Record that global symbol GSYM has R_TYPE dynamic relocation in the |
| 2051 | // secondary GOT at OFFSET. |
| 2052 | void |
| 2053 | add_secondary_got_reloc(unsigned int got_offset, unsigned int r_type, |
| 2054 | Mips_symbol<size>* gsym) |
| 2055 | { |
| 2056 | this->secondary_got_relocs_.push_back(Static_reloc(got_offset, |
| 2057 | r_type, gsym)); |
| 2058 | } |
| 2059 | |
| 2060 | // Update GOT entry at OFFSET with VALUE. |
| 2061 | void |
| 2062 | update_got_entry(unsigned int offset, Mips_address value) |
| 2063 | { |
| 2064 | elfcpp::Swap<size, big_endian>::writeval(this->got_view_ + offset, value); |
| 2065 | } |
| 2066 | |
| 2067 | // Return the number of entries in local part of the GOT. This includes |
| 2068 | // local entries, page entries and 2 reserved entries. |
| 2069 | unsigned int |
| 2070 | get_local_gotno() const |
| 2071 | { |
| 2072 | if (!this->multi_got()) |
| 2073 | { |
| 2074 | return (2 + this->master_got_info_->local_gotno() |
| 2075 | + this->master_got_info_->page_gotno()); |
| 2076 | } |
| 2077 | else |
| 2078 | return 2 + this->primary_got_->local_gotno() + this->primary_got_->page_gotno(); |
| 2079 | } |
| 2080 | |
| 2081 | // Return dynamic symbol table index of the first symbol with global GOT |
| 2082 | // entry. |
| 2083 | unsigned int |
| 2084 | first_global_got_dynsym_index() const |
| 2085 | { return this->first_global_got_dynsym_index_; } |
| 2086 | |
| 2087 | // Set dynamic symbol table index of the first symbol with global GOT entry. |
| 2088 | void |
| 2089 | set_first_global_got_dynsym_index(unsigned int index) |
| 2090 | { this->first_global_got_dynsym_index_ = index; } |
| 2091 | |
| 2092 | // Lay out the GOT. Add local, global and TLS entries. If GOT is |
| 2093 | // larger than 64K, create multi-GOT. |
| 2094 | void |
| 2095 | lay_out_got(Layout* layout, Symbol_table* symtab, |
| 2096 | const Input_objects* input_objects); |
| 2097 | |
| 2098 | // Create multi-GOT. For every GOT, add local, global and TLS entries. |
| 2099 | void |
| 2100 | lay_out_multi_got(Layout* layout, const Input_objects* input_objects); |
| 2101 | |
| 2102 | // Attempt to merge GOTs of different input objects. |
| 2103 | void |
| 2104 | merge_gots(const Input_objects* input_objects); |
| 2105 | |
| 2106 | // Consider merging FROM, which is OBJECT's GOT, into TO. Return false if |
| 2107 | // this would lead to overflow, true if they were merged successfully. |
| 2108 | bool |
| 2109 | merge_got_with(Mips_got_info<size, big_endian>* from, |
| 2110 | Mips_relobj<size, big_endian>* object, |
| 2111 | Mips_got_info<size, big_endian>* to); |
| 2112 | |
| 2113 | // Return the offset of GOT page entry for VALUE. For multi-GOT links, |
| 2114 | // use OBJECT's GOT. |
| 2115 | unsigned int |
| 2116 | get_got_page_offset(Mips_address value, |
| 2117 | const Mips_relobj<size, big_endian>* object) |
| 2118 | { |
| 2119 | Mips_got_info<size, big_endian>* g = (!this->multi_got() |
| 2120 | ? this->master_got_info_ |
| 2121 | : object->get_got_info()); |
| 2122 | gold_assert(g != NULL); |
| 2123 | return g->get_got_page_offset(value, this); |
| 2124 | } |
| 2125 | |
| 2126 | // Return the GOT offset of type GOT_TYPE of the global symbol |
| 2127 | // GSYM. For multi-GOT links, use OBJECT's GOT. |
| 2128 | unsigned int got_offset(const Symbol* gsym, unsigned int got_type, |
| 2129 | Mips_relobj<size, big_endian>* object) const |
| 2130 | { |
| 2131 | if (!this->multi_got()) |
| 2132 | return gsym->got_offset(got_type); |
| 2133 | else |
| 2134 | { |
| 2135 | Mips_got_info<size, big_endian>* g = object->get_got_info(); |
| 2136 | gold_assert(g != NULL); |
| 2137 | return gsym->got_offset(g->multigot_got_type(got_type)); |
| 2138 | } |
| 2139 | } |
| 2140 | |
| 2141 | // Return the GOT offset of type GOT_TYPE of the local symbol |
| 2142 | // SYMNDX. |
| 2143 | unsigned int |
| 2144 | got_offset(unsigned int symndx, unsigned int got_type, |
| 2145 | Sized_relobj_file<size, big_endian>* object, |
| 2146 | uint64_t addend) const |
| 2147 | { return object->local_got_offset(symndx, got_type, addend); } |
| 2148 | |
| 2149 | // Return the offset of TLS LDM entry. For multi-GOT links, use OBJECT's GOT. |
| 2150 | unsigned int |
| 2151 | tls_ldm_offset(Mips_relobj<size, big_endian>* object) const |
| 2152 | { |
| 2153 | Mips_got_info<size, big_endian>* g = (!this->multi_got() |
| 2154 | ? this->master_got_info_ |
| 2155 | : object->get_got_info()); |
| 2156 | gold_assert(g != NULL); |
| 2157 | return g->tls_ldm_offset(); |
| 2158 | } |
| 2159 | |
| 2160 | // Set the offset of TLS LDM entry. For multi-GOT links, use OBJECT's GOT. |
| 2161 | void |
| 2162 | set_tls_ldm_offset(unsigned int tls_ldm_offset, |
| 2163 | Mips_relobj<size, big_endian>* object) |
| 2164 | { |
| 2165 | Mips_got_info<size, big_endian>* g = (!this->multi_got() |
| 2166 | ? this->master_got_info_ |
| 2167 | : object->get_got_info()); |
| 2168 | gold_assert(g != NULL); |
| 2169 | g->set_tls_ldm_offset(tls_ldm_offset); |
| 2170 | } |
| 2171 | |
| 2172 | // Return true for multi-GOT links. |
| 2173 | bool |
| 2174 | multi_got() const |
| 2175 | { return this->primary_got_ != NULL; } |
| 2176 | |
| 2177 | // Return the offset of OBJECT's GOT from the start of .got section. |
| 2178 | unsigned int |
| 2179 | get_got_offset(const Mips_relobj<size, big_endian>* object) |
| 2180 | { |
| 2181 | if (!this->multi_got()) |
| 2182 | return 0; |
| 2183 | else |
| 2184 | { |
| 2185 | Mips_got_info<size, big_endian>* g = object->get_got_info(); |
| 2186 | return g != NULL ? g->offset() : 0; |
| 2187 | } |
| 2188 | } |
| 2189 | |
| 2190 | // Create global GOT entries that should be in the GGA_RELOC_ONLY area. |
| 2191 | void |
| 2192 | add_reloc_only_entries() |
| 2193 | { this->master_got_info_->add_reloc_only_entries(this); } |
| 2194 | |
| 2195 | // Return offset of the primary GOT's entry for global symbol. |
| 2196 | unsigned int |
| 2197 | get_primary_got_offset(const Mips_symbol<size>* sym) const |
| 2198 | { |
| 2199 | gold_assert(sym->global_got_area() != GGA_NONE); |
| 2200 | return (this->get_local_gotno() + sym->dynsym_index() |
| 2201 | - this->first_global_got_dynsym_index()) * size/8; |
| 2202 | } |
| 2203 | |
| 2204 | // For the entry at offset GOT_OFFSET, return its offset from the gp. |
| 2205 | // Input argument GOT_OFFSET is always global offset from the start of |
| 2206 | // .got section, for both single and multi-GOT links. |
| 2207 | // For single GOT links, this returns GOT_OFFSET - 0x7FF0. For multi-GOT |
| 2208 | // links, the return value is object_got_offset - 0x7FF0, where |
| 2209 | // object_got_offset is offset in the OBJECT's GOT. |
| 2210 | int |
| 2211 | gp_offset(unsigned int got_offset, |
| 2212 | const Mips_relobj<size, big_endian>* object) const |
| 2213 | { |
| 2214 | return (this->address() + got_offset |
| 2215 | - this->target_->adjusted_gp_value(object)); |
| 2216 | } |
| 2217 | |
| 2218 | protected: |
| 2219 | // Write out the GOT table. |
| 2220 | void |
| 2221 | do_write(Output_file*); |
| 2222 | |
| 2223 | private: |
| 2224 | |
| 2225 | // This class represent dynamic relocations that need to be applied by |
| 2226 | // gold because we are using TLS relocations in a static link. |
| 2227 | class Static_reloc |
| 2228 | { |
| 2229 | public: |
| 2230 | Static_reloc(unsigned int got_offset, unsigned int r_type, |
| 2231 | Mips_symbol<size>* gsym) |
| 2232 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true) |
| 2233 | { this->u_.global.symbol = gsym; } |
| 2234 | |
| 2235 | Static_reloc(unsigned int got_offset, unsigned int r_type, |
| 2236 | Sized_relobj_file<size, big_endian>* relobj, unsigned int index) |
| 2237 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false) |
| 2238 | { |
| 2239 | this->u_.local.relobj = relobj; |
| 2240 | this->u_.local.index = index; |
| 2241 | } |
| 2242 | |
| 2243 | // Return the GOT offset. |
| 2244 | unsigned int |
| 2245 | got_offset() const |
| 2246 | { return this->got_offset_; } |
| 2247 | |
| 2248 | // Relocation type. |
| 2249 | unsigned int |
| 2250 | r_type() const |
| 2251 | { return this->r_type_; } |
| 2252 | |
| 2253 | // Whether the symbol is global or not. |
| 2254 | bool |
| 2255 | symbol_is_global() const |
| 2256 | { return this->symbol_is_global_; } |
| 2257 | |
| 2258 | // For a relocation against a global symbol, the global symbol. |
| 2259 | Mips_symbol<size>* |
| 2260 | symbol() const |
| 2261 | { |
| 2262 | gold_assert(this->symbol_is_global_); |
| 2263 | return this->u_.global.symbol; |
| 2264 | } |
| 2265 | |
| 2266 | // For a relocation against a local symbol, the defining object. |
| 2267 | Sized_relobj_file<size, big_endian>* |
| 2268 | relobj() const |
| 2269 | { |
| 2270 | gold_assert(!this->symbol_is_global_); |
| 2271 | return this->u_.local.relobj; |
| 2272 | } |
| 2273 | |
| 2274 | // For a relocation against a local symbol, the local symbol index. |
| 2275 | unsigned int |
| 2276 | index() const |
| 2277 | { |
| 2278 | gold_assert(!this->symbol_is_global_); |
| 2279 | return this->u_.local.index; |
| 2280 | } |
| 2281 | |
| 2282 | private: |
| 2283 | // GOT offset of the entry to which this relocation is applied. |
| 2284 | unsigned int got_offset_; |
| 2285 | // Type of relocation. |
| 2286 | unsigned int r_type_; |
| 2287 | // Whether this relocation is against a global symbol. |
| 2288 | bool symbol_is_global_; |
| 2289 | // A global or local symbol. |
| 2290 | union |
| 2291 | { |
| 2292 | struct |
| 2293 | { |
| 2294 | // For a global symbol, the symbol itself. |
| 2295 | Mips_symbol<size>* symbol; |
| 2296 | } global; |
| 2297 | struct |
| 2298 | { |
| 2299 | // For a local symbol, the object defining object. |
| 2300 | Sized_relobj_file<size, big_endian>* relobj; |
| 2301 | // For a local symbol, the symbol index. |
| 2302 | unsigned int index; |
| 2303 | } local; |
| 2304 | } u_; |
| 2305 | }; |
| 2306 | |
| 2307 | // The target. |
| 2308 | Target_mips<size, big_endian>* target_; |
| 2309 | // The symbol table. |
| 2310 | Symbol_table* symbol_table_; |
| 2311 | // The layout. |
| 2312 | Layout* layout_; |
| 2313 | // Static relocs to be applied to the GOT. |
| 2314 | std::vector<Static_reloc> static_relocs_; |
| 2315 | // .got section view. |
| 2316 | unsigned char* got_view_; |
| 2317 | // The dynamic symbol table index of the first symbol with global GOT entry. |
| 2318 | unsigned int first_global_got_dynsym_index_; |
| 2319 | // The master GOT information. |
| 2320 | Mips_got_info<size, big_endian>* master_got_info_; |
| 2321 | // The primary GOT information. |
| 2322 | Mips_got_info<size, big_endian>* primary_got_; |
| 2323 | // Secondary GOT fixups. |
| 2324 | std::vector<Static_reloc> secondary_got_relocs_; |
| 2325 | }; |
| 2326 | |
| 2327 | // A class to handle LA25 stubs - non-PIC interface to a PIC function. There are |
| 2328 | // two ways of creating these interfaces. The first is to add: |
| 2329 | // |
| 2330 | // lui $25,%hi(func) |
| 2331 | // j func |
| 2332 | // addiu $25,$25,%lo(func) |
| 2333 | // |
| 2334 | // to a separate trampoline section. The second is to add: |
| 2335 | // |
| 2336 | // lui $25,%hi(func) |
| 2337 | // addiu $25,$25,%lo(func) |
| 2338 | // |
| 2339 | // immediately before a PIC function "func", but only if a function is at the |
| 2340 | // beginning of the section, and the section is not too heavily aligned (i.e we |
| 2341 | // would need to add no more than 2 nops before the stub.) |
| 2342 | // |
| 2343 | // We only create stubs of the first type. |
| 2344 | |
| 2345 | template<int size, bool big_endian> |
| 2346 | class Mips_output_data_la25_stub : public Output_section_data |
| 2347 | { |
| 2348 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 2349 | |
| 2350 | public: |
| 2351 | Mips_output_data_la25_stub() |
| 2352 | : Output_section_data(size == 32 ? 4 : 8), symbols_() |
| 2353 | { } |
| 2354 | |
| 2355 | // Create LA25 stub for a symbol. |
| 2356 | void |
| 2357 | create_la25_stub(Symbol_table* symtab, Target_mips<size, big_endian>* target, |
| 2358 | Mips_symbol<size>* gsym); |
| 2359 | |
| 2360 | // Return output address of a stub. |
| 2361 | Mips_address |
| 2362 | stub_address(const Mips_symbol<size>* sym) const |
| 2363 | { |
| 2364 | gold_assert(sym->has_la25_stub()); |
| 2365 | return this->address() + sym->la25_stub_offset(); |
| 2366 | } |
| 2367 | |
| 2368 | protected: |
| 2369 | void |
| 2370 | do_adjust_output_section(Output_section* os) |
| 2371 | { os->set_entsize(0); } |
| 2372 | |
| 2373 | private: |
| 2374 | // Template for standard LA25 stub. |
| 2375 | static const uint32_t la25_stub_entry[]; |
| 2376 | // Template for microMIPS LA25 stub. |
| 2377 | static const uint32_t la25_stub_micromips_entry[]; |
| 2378 | |
| 2379 | // Set the final size. |
| 2380 | void |
| 2381 | set_final_data_size() |
| 2382 | { this->set_data_size(this->symbols_.size() * 16); } |
| 2383 | |
| 2384 | // Create a symbol for SYM stub's value and size, to help make the |
| 2385 | // disassembly easier to read. |
| 2386 | void |
| 2387 | create_stub_symbol(Mips_symbol<size>* sym, Symbol_table* symtab, |
| 2388 | Target_mips<size, big_endian>* target, uint64_t symsize); |
| 2389 | |
| 2390 | // Write to a map file. |
| 2391 | void |
| 2392 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2393 | { mapfile->print_output_data(this, _(".LA25.stubs")); } |
| 2394 | |
| 2395 | // Write out the LA25 stub section. |
| 2396 | void |
| 2397 | do_write(Output_file*); |
| 2398 | |
| 2399 | // Symbols that have LA25 stubs. |
| 2400 | std::vector<Mips_symbol<size>*> symbols_; |
| 2401 | }; |
| 2402 | |
| 2403 | // MIPS-specific relocation writer. |
| 2404 | |
| 2405 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 2406 | struct Mips_output_reloc_writer; |
| 2407 | |
| 2408 | template<int sh_type, bool dynamic, bool big_endian> |
| 2409 | struct Mips_output_reloc_writer<sh_type, dynamic, 32, big_endian> |
| 2410 | { |
| 2411 | typedef Output_reloc<sh_type, dynamic, 32, big_endian> Output_reloc_type; |
| 2412 | typedef std::vector<Output_reloc_type> Relocs; |
| 2413 | |
| 2414 | static void |
| 2415 | write(typename Relocs::const_iterator p, unsigned char* pov) |
| 2416 | { p->write(pov); } |
| 2417 | }; |
| 2418 | |
| 2419 | template<int sh_type, bool dynamic, bool big_endian> |
| 2420 | struct Mips_output_reloc_writer<sh_type, dynamic, 64, big_endian> |
| 2421 | { |
| 2422 | typedef Output_reloc<sh_type, dynamic, 64, big_endian> Output_reloc_type; |
| 2423 | typedef std::vector<Output_reloc_type> Relocs; |
| 2424 | |
| 2425 | static void |
| 2426 | write(typename Relocs::const_iterator p, unsigned char* pov) |
| 2427 | { |
| 2428 | elfcpp::Mips64_rel_write<big_endian> orel(pov); |
| 2429 | orel.put_r_offset(p->get_address()); |
| 2430 | orel.put_r_sym(p->get_symbol_index()); |
| 2431 | orel.put_r_ssym(RSS_UNDEF); |
| 2432 | orel.put_r_type(p->type()); |
| 2433 | if (p->type() == elfcpp::R_MIPS_REL32) |
| 2434 | orel.put_r_type2(elfcpp::R_MIPS_64); |
| 2435 | else |
| 2436 | orel.put_r_type2(elfcpp::R_MIPS_NONE); |
| 2437 | orel.put_r_type3(elfcpp::R_MIPS_NONE); |
| 2438 | } |
| 2439 | }; |
| 2440 | |
| 2441 | template<int sh_type, bool dynamic, int size, bool big_endian> |
| 2442 | class Mips_output_data_reloc : public Output_data_reloc<sh_type, dynamic, |
| 2443 | size, big_endian> |
| 2444 | { |
| 2445 | public: |
| 2446 | Mips_output_data_reloc(bool sort_relocs) |
| 2447 | : Output_data_reloc<sh_type, dynamic, size, big_endian>(sort_relocs) |
| 2448 | { } |
| 2449 | |
| 2450 | protected: |
| 2451 | // Write out the data. |
| 2452 | void |
| 2453 | do_write(Output_file* of) |
| 2454 | { |
| 2455 | typedef Mips_output_reloc_writer<sh_type, dynamic, size, |
| 2456 | big_endian> Writer; |
| 2457 | this->template do_write_generic<Writer>(of); |
| 2458 | } |
| 2459 | }; |
| 2460 | |
| 2461 | |
| 2462 | // A class to handle the PLT data. |
| 2463 | |
| 2464 | template<int size, bool big_endian> |
| 2465 | class Mips_output_data_plt : public Output_section_data |
| 2466 | { |
| 2467 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 2468 | typedef Mips_output_data_reloc<elfcpp::SHT_REL, true, |
| 2469 | size, big_endian> Reloc_section; |
| 2470 | |
| 2471 | public: |
| 2472 | // Create the PLT section. The ordinary .got section is an argument, |
| 2473 | // since we need to refer to the start. |
| 2474 | Mips_output_data_plt(Layout* layout, Output_data_space* got_plt, |
| 2475 | Target_mips<size, big_endian>* target) |
| 2476 | : Output_section_data(size == 32 ? 4 : 8), got_plt_(got_plt), symbols_(), |
| 2477 | plt_mips_offset_(0), plt_comp_offset_(0), plt_header_size_(0), |
| 2478 | target_(target) |
| 2479 | { |
| 2480 | this->rel_ = new Reloc_section(false); |
| 2481 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
| 2482 | elfcpp::SHF_ALLOC, this->rel_, |
| 2483 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 2484 | } |
| 2485 | |
| 2486 | // Add an entry to the PLT for a symbol referenced by r_type relocation. |
| 2487 | void |
| 2488 | add_entry(Mips_symbol<size>* gsym, unsigned int r_type); |
| 2489 | |
| 2490 | // Return the .rel.plt section data. |
| 2491 | Reloc_section* |
| 2492 | rel_plt() const |
| 2493 | { return this->rel_; } |
| 2494 | |
| 2495 | // Return the number of PLT entries. |
| 2496 | unsigned int |
| 2497 | entry_count() const |
| 2498 | { return this->symbols_.size(); } |
| 2499 | |
| 2500 | // Return the offset of the first non-reserved PLT entry. |
| 2501 | unsigned int |
| 2502 | first_plt_entry_offset() const |
| 2503 | { return sizeof(plt0_entry_o32); } |
| 2504 | |
| 2505 | // Return the size of a PLT entry. |
| 2506 | unsigned int |
| 2507 | plt_entry_size() const |
| 2508 | { return sizeof(plt_entry); } |
| 2509 | |
| 2510 | // Set final PLT offsets. For each symbol, determine whether standard or |
| 2511 | // compressed (MIPS16 or microMIPS) PLT entry is used. |
| 2512 | void |
| 2513 | set_plt_offsets(); |
| 2514 | |
| 2515 | // Return the offset of the first standard PLT entry. |
| 2516 | unsigned int |
| 2517 | first_mips_plt_offset() const |
| 2518 | { return this->plt_header_size_; } |
| 2519 | |
| 2520 | // Return the offset of the first compressed PLT entry. |
| 2521 | unsigned int |
| 2522 | first_comp_plt_offset() const |
| 2523 | { return this->plt_header_size_ + this->plt_mips_offset_; } |
| 2524 | |
| 2525 | // Return whether there are any standard PLT entries. |
| 2526 | bool |
| 2527 | has_standard_entries() const |
| 2528 | { return this->plt_mips_offset_ > 0; } |
| 2529 | |
| 2530 | // Return the output address of standard PLT entry. |
| 2531 | Mips_address |
| 2532 | mips_entry_address(const Mips_symbol<size>* sym) const |
| 2533 | { |
| 2534 | gold_assert (sym->has_mips_plt_offset()); |
| 2535 | return (this->address() + this->first_mips_plt_offset() |
| 2536 | + sym->mips_plt_offset()); |
| 2537 | } |
| 2538 | |
| 2539 | // Return the output address of compressed (MIPS16 or microMIPS) PLT entry. |
| 2540 | Mips_address |
| 2541 | comp_entry_address(const Mips_symbol<size>* sym) const |
| 2542 | { |
| 2543 | gold_assert (sym->has_comp_plt_offset()); |
| 2544 | return (this->address() + this->first_comp_plt_offset() |
| 2545 | + sym->comp_plt_offset()); |
| 2546 | } |
| 2547 | |
| 2548 | protected: |
| 2549 | void |
| 2550 | do_adjust_output_section(Output_section* os) |
| 2551 | { os->set_entsize(0); } |
| 2552 | |
| 2553 | // Write to a map file. |
| 2554 | void |
| 2555 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2556 | { mapfile->print_output_data(this, _(".plt")); } |
| 2557 | |
| 2558 | private: |
| 2559 | // Template for the first PLT entry. |
| 2560 | static const uint32_t plt0_entry_o32[]; |
| 2561 | static const uint32_t plt0_entry_n32[]; |
| 2562 | static const uint32_t plt0_entry_n64[]; |
| 2563 | static const uint32_t plt0_entry_micromips_o32[]; |
| 2564 | static const uint32_t plt0_entry_micromips32_o32[]; |
| 2565 | |
| 2566 | // Template for subsequent PLT entries. |
| 2567 | static const uint32_t plt_entry[]; |
| 2568 | static const uint32_t plt_entry_r6[]; |
| 2569 | static const uint32_t plt_entry_mips16_o32[]; |
| 2570 | static const uint32_t plt_entry_micromips_o32[]; |
| 2571 | static const uint32_t plt_entry_micromips32_o32[]; |
| 2572 | |
| 2573 | // Set the final size. |
| 2574 | void |
| 2575 | set_final_data_size() |
| 2576 | { |
| 2577 | this->set_data_size(this->plt_header_size_ + this->plt_mips_offset_ |
| 2578 | + this->plt_comp_offset_); |
| 2579 | } |
| 2580 | |
| 2581 | // Write out the PLT data. |
| 2582 | void |
| 2583 | do_write(Output_file*); |
| 2584 | |
| 2585 | // Return whether the plt header contains microMIPS code. For the sake of |
| 2586 | // cache alignment always use a standard header whenever any standard entries |
| 2587 | // are present even if microMIPS entries are present as well. This also lets |
| 2588 | // the microMIPS header rely on the value of $v0 only set by microMIPS |
| 2589 | // entries, for a small size reduction. |
| 2590 | bool |
| 2591 | is_plt_header_compressed() const |
| 2592 | { |
| 2593 | gold_assert(this->plt_mips_offset_ + this->plt_comp_offset_ != 0); |
| 2594 | return this->target_->is_output_micromips() && this->plt_mips_offset_ == 0; |
| 2595 | } |
| 2596 | |
| 2597 | // Return the size of the PLT header. |
| 2598 | unsigned int |
| 2599 | get_plt_header_size() const |
| 2600 | { |
| 2601 | if (this->target_->is_output_n64()) |
| 2602 | return 4 * sizeof(plt0_entry_n64) / sizeof(plt0_entry_n64[0]); |
| 2603 | else if (this->target_->is_output_n32()) |
| 2604 | return 4 * sizeof(plt0_entry_n32) / sizeof(plt0_entry_n32[0]); |
| 2605 | else if (!this->is_plt_header_compressed()) |
| 2606 | return 4 * sizeof(plt0_entry_o32) / sizeof(plt0_entry_o32[0]); |
| 2607 | else if (this->target_->use_32bit_micromips_instructions()) |
| 2608 | return (2 * sizeof(plt0_entry_micromips32_o32) |
| 2609 | / sizeof(plt0_entry_micromips32_o32[0])); |
| 2610 | else |
| 2611 | return (2 * sizeof(plt0_entry_micromips_o32) |
| 2612 | / sizeof(plt0_entry_micromips_o32[0])); |
| 2613 | } |
| 2614 | |
| 2615 | // Return the PLT header entry. |
| 2616 | const uint32_t* |
| 2617 | get_plt_header_entry() const |
| 2618 | { |
| 2619 | if (this->target_->is_output_n64()) |
| 2620 | return plt0_entry_n64; |
| 2621 | else if (this->target_->is_output_n32()) |
| 2622 | return plt0_entry_n32; |
| 2623 | else if (!this->is_plt_header_compressed()) |
| 2624 | return plt0_entry_o32; |
| 2625 | else if (this->target_->use_32bit_micromips_instructions()) |
| 2626 | return plt0_entry_micromips32_o32; |
| 2627 | else |
| 2628 | return plt0_entry_micromips_o32; |
| 2629 | } |
| 2630 | |
| 2631 | // Return the size of the standard PLT entry. |
| 2632 | unsigned int |
| 2633 | standard_plt_entry_size() const |
| 2634 | { return 4 * sizeof(plt_entry) / sizeof(plt_entry[0]); } |
| 2635 | |
| 2636 | // Return the size of the compressed PLT entry. |
| 2637 | unsigned int |
| 2638 | compressed_plt_entry_size() const |
| 2639 | { |
| 2640 | gold_assert(!this->target_->is_output_newabi()); |
| 2641 | |
| 2642 | if (!this->target_->is_output_micromips()) |
| 2643 | return (2 * sizeof(plt_entry_mips16_o32) |
| 2644 | / sizeof(plt_entry_mips16_o32[0])); |
| 2645 | else if (this->target_->use_32bit_micromips_instructions()) |
| 2646 | return (2 * sizeof(plt_entry_micromips32_o32) |
| 2647 | / sizeof(plt_entry_micromips32_o32[0])); |
| 2648 | else |
| 2649 | return (2 * sizeof(plt_entry_micromips_o32) |
| 2650 | / sizeof(plt_entry_micromips_o32[0])); |
| 2651 | } |
| 2652 | |
| 2653 | // The reloc section. |
| 2654 | Reloc_section* rel_; |
| 2655 | // The .got.plt section. |
| 2656 | Output_data_space* got_plt_; |
| 2657 | // Symbols that have PLT entry. |
| 2658 | std::vector<Mips_symbol<size>*> symbols_; |
| 2659 | // The offset of the next standard PLT entry to create. |
| 2660 | unsigned int plt_mips_offset_; |
| 2661 | // The offset of the next compressed PLT entry to create. |
| 2662 | unsigned int plt_comp_offset_; |
| 2663 | // The size of the PLT header in bytes. |
| 2664 | unsigned int plt_header_size_; |
| 2665 | // The target. |
| 2666 | Target_mips<size, big_endian>* target_; |
| 2667 | }; |
| 2668 | |
| 2669 | // A class to handle the .MIPS.stubs data. |
| 2670 | |
| 2671 | template<int size, bool big_endian> |
| 2672 | class Mips_output_data_mips_stubs : public Output_section_data |
| 2673 | { |
| 2674 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 2675 | |
| 2676 | // Unordered set of .MIPS.stubs entries. |
| 2677 | typedef Unordered_set<Mips_symbol<size>*, Mips_symbol_hash<size> > |
| 2678 | Mips_stubs_entry_set; |
| 2679 | |
| 2680 | public: |
| 2681 | Mips_output_data_mips_stubs(Target_mips<size, big_endian>* target) |
| 2682 | : Output_section_data(size == 32 ? 4 : 8), symbols_(), dynsym_count_(-1U), |
| 2683 | stub_offsets_are_set_(false), target_(target) |
| 2684 | { } |
| 2685 | |
| 2686 | // Create entry for a symbol. |
| 2687 | void |
| 2688 | make_entry(Mips_symbol<size>*); |
| 2689 | |
| 2690 | // Remove entry for a symbol. |
| 2691 | void |
| 2692 | remove_entry(Mips_symbol<size>* gsym); |
| 2693 | |
| 2694 | // Set stub offsets for symbols. This method expects that the number of |
| 2695 | // entries in dynamic symbol table is set. |
| 2696 | void |
| 2697 | set_lazy_stub_offsets(); |
| 2698 | |
| 2699 | void |
| 2700 | set_needs_dynsym_value(); |
| 2701 | |
| 2702 | // Set the number of entries in dynamic symbol table. |
| 2703 | void |
| 2704 | set_dynsym_count(unsigned int dynsym_count) |
| 2705 | { this->dynsym_count_ = dynsym_count; } |
| 2706 | |
| 2707 | // Return maximum size of the stub, ie. the stub size if the dynamic symbol |
| 2708 | // count is greater than 0x10000. If the dynamic symbol count is less than |
| 2709 | // 0x10000, the stub will be 4 bytes smaller. |
| 2710 | // There's no disadvantage from using microMIPS code here, so for the sake of |
| 2711 | // pure-microMIPS binaries we prefer it whenever there's any microMIPS code in |
| 2712 | // output produced at all. This has a benefit of stubs being shorter by |
| 2713 | // 4 bytes each too, unless in the insn32 mode. |
| 2714 | unsigned int |
| 2715 | stub_max_size() const |
| 2716 | { |
| 2717 | if (!this->target_->is_output_micromips() |
| 2718 | || this->target_->use_32bit_micromips_instructions()) |
| 2719 | return 20; |
| 2720 | else |
| 2721 | return 16; |
| 2722 | } |
| 2723 | |
| 2724 | // Return the size of the stub. This method expects that the final dynsym |
| 2725 | // count is set. |
| 2726 | unsigned int |
| 2727 | stub_size() const |
| 2728 | { |
| 2729 | gold_assert(this->dynsym_count_ != -1U); |
| 2730 | if (this->dynsym_count_ > 0x10000) |
| 2731 | return this->stub_max_size(); |
| 2732 | else |
| 2733 | return this->stub_max_size() - 4; |
| 2734 | } |
| 2735 | |
| 2736 | // Return output address of a stub. |
| 2737 | Mips_address |
| 2738 | stub_address(const Mips_symbol<size>* sym) const |
| 2739 | { |
| 2740 | gold_assert(sym->has_lazy_stub()); |
| 2741 | return this->address() + sym->lazy_stub_offset(); |
| 2742 | } |
| 2743 | |
| 2744 | protected: |
| 2745 | void |
| 2746 | do_adjust_output_section(Output_section* os) |
| 2747 | { os->set_entsize(0); } |
| 2748 | |
| 2749 | // Write to a map file. |
| 2750 | void |
| 2751 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2752 | { mapfile->print_output_data(this, _(".MIPS.stubs")); } |
| 2753 | |
| 2754 | private: |
| 2755 | static const uint32_t lazy_stub_normal_1[]; |
| 2756 | static const uint32_t lazy_stub_normal_1_n64[]; |
| 2757 | static const uint32_t lazy_stub_normal_2[]; |
| 2758 | static const uint32_t lazy_stub_normal_2_n64[]; |
| 2759 | static const uint32_t lazy_stub_big[]; |
| 2760 | static const uint32_t lazy_stub_big_n64[]; |
| 2761 | |
| 2762 | static const uint32_t lazy_stub_micromips_normal_1[]; |
| 2763 | static const uint32_t lazy_stub_micromips_normal_1_n64[]; |
| 2764 | static const uint32_t lazy_stub_micromips_normal_2[]; |
| 2765 | static const uint32_t lazy_stub_micromips_normal_2_n64[]; |
| 2766 | static const uint32_t lazy_stub_micromips_big[]; |
| 2767 | static const uint32_t lazy_stub_micromips_big_n64[]; |
| 2768 | |
| 2769 | static const uint32_t lazy_stub_micromips32_normal_1[]; |
| 2770 | static const uint32_t lazy_stub_micromips32_normal_1_n64[]; |
| 2771 | static const uint32_t lazy_stub_micromips32_normal_2[]; |
| 2772 | static const uint32_t lazy_stub_micromips32_normal_2_n64[]; |
| 2773 | static const uint32_t lazy_stub_micromips32_big[]; |
| 2774 | static const uint32_t lazy_stub_micromips32_big_n64[]; |
| 2775 | |
| 2776 | // Set the final size. |
| 2777 | void |
| 2778 | set_final_data_size() |
| 2779 | { this->set_data_size(this->symbols_.size() * this->stub_max_size()); } |
| 2780 | |
| 2781 | // Write out the .MIPS.stubs data. |
| 2782 | void |
| 2783 | do_write(Output_file*); |
| 2784 | |
| 2785 | // .MIPS.stubs symbols |
| 2786 | Mips_stubs_entry_set symbols_; |
| 2787 | // Number of entries in dynamic symbol table. |
| 2788 | unsigned int dynsym_count_; |
| 2789 | // Whether the stub offsets are set. |
| 2790 | bool stub_offsets_are_set_; |
| 2791 | // The target. |
| 2792 | Target_mips<size, big_endian>* target_; |
| 2793 | }; |
| 2794 | |
| 2795 | // This class handles Mips .reginfo output section. |
| 2796 | |
| 2797 | template<int size, bool big_endian> |
| 2798 | class Mips_output_section_reginfo : public Output_section_data |
| 2799 | { |
| 2800 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| 2801 | |
| 2802 | public: |
| 2803 | Mips_output_section_reginfo(Target_mips<size, big_endian>* target, |
| 2804 | Valtype gprmask, Valtype cprmask1, |
| 2805 | Valtype cprmask2, Valtype cprmask3, |
| 2806 | Valtype cprmask4) |
| 2807 | : Output_section_data(24, 4, true), target_(target), |
| 2808 | gprmask_(gprmask), cprmask1_(cprmask1), cprmask2_(cprmask2), |
| 2809 | cprmask3_(cprmask3), cprmask4_(cprmask4) |
| 2810 | { } |
| 2811 | |
| 2812 | protected: |
| 2813 | // Write to a map file. |
| 2814 | void |
| 2815 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2816 | { mapfile->print_output_data(this, _(".reginfo")); } |
| 2817 | |
| 2818 | // Write out reginfo section. |
| 2819 | void |
| 2820 | do_write(Output_file* of); |
| 2821 | |
| 2822 | private: |
| 2823 | Target_mips<size, big_endian>* target_; |
| 2824 | |
| 2825 | // gprmask of the output .reginfo section. |
| 2826 | Valtype gprmask_; |
| 2827 | // cprmask1 of the output .reginfo section. |
| 2828 | Valtype cprmask1_; |
| 2829 | // cprmask2 of the output .reginfo section. |
| 2830 | Valtype cprmask2_; |
| 2831 | // cprmask3 of the output .reginfo section. |
| 2832 | Valtype cprmask3_; |
| 2833 | // cprmask4 of the output .reginfo section. |
| 2834 | Valtype cprmask4_; |
| 2835 | }; |
| 2836 | |
| 2837 | // This class handles .MIPS.options output section. |
| 2838 | |
| 2839 | template<int size, bool big_endian> |
| 2840 | class Mips_output_section_options : public Output_section |
| 2841 | { |
| 2842 | public: |
| 2843 | Mips_output_section_options(const char* name, elfcpp::Elf_Word type, |
| 2844 | elfcpp::Elf_Xword flags, |
| 2845 | Target_mips<size, big_endian>* target) |
| 2846 | : Output_section(name, type, flags), target_(target) |
| 2847 | { |
| 2848 | // After the input sections are written, we only need to update |
| 2849 | // ri_gp_value field of ODK_REGINFO entries. |
| 2850 | this->set_after_input_sections(); |
| 2851 | } |
| 2852 | |
| 2853 | protected: |
| 2854 | // Write out option section. |
| 2855 | void |
| 2856 | do_write(Output_file* of); |
| 2857 | |
| 2858 | private: |
| 2859 | Target_mips<size, big_endian>* target_; |
| 2860 | }; |
| 2861 | |
| 2862 | // This class handles .MIPS.abiflags output section. |
| 2863 | |
| 2864 | template<int size, bool big_endian> |
| 2865 | class Mips_output_section_abiflags : public Output_section_data |
| 2866 | { |
| 2867 | public: |
| 2868 | Mips_output_section_abiflags(const Mips_abiflags<big_endian>& abiflags) |
| 2869 | : Output_section_data(24, 8, true), abiflags_(abiflags) |
| 2870 | { } |
| 2871 | |
| 2872 | protected: |
| 2873 | // Write to a map file. |
| 2874 | void |
| 2875 | do_print_to_mapfile(Mapfile* mapfile) const |
| 2876 | { mapfile->print_output_data(this, _(".MIPS.abiflags")); } |
| 2877 | |
| 2878 | void |
| 2879 | do_write(Output_file* of); |
| 2880 | |
| 2881 | private: |
| 2882 | const Mips_abiflags<big_endian>& abiflags_; |
| 2883 | }; |
| 2884 | |
| 2885 | // The MIPS target has relocation types which default handling of relocatable |
| 2886 | // relocation cannot process. So we have to extend the default code. |
| 2887 | |
| 2888 | template<bool big_endian, typename Classify_reloc> |
| 2889 | class Mips_scan_relocatable_relocs : |
| 2890 | public Default_scan_relocatable_relocs<Classify_reloc> |
| 2891 | { |
| 2892 | public: |
| 2893 | // Return the strategy to use for a local symbol which is a section |
| 2894 | // symbol, given the relocation type. |
| 2895 | inline Relocatable_relocs::Reloc_strategy |
| 2896 | local_section_strategy(unsigned int r_type, Relobj* object) |
| 2897 | { |
| 2898 | if (Classify_reloc::sh_type == elfcpp::SHT_RELA) |
| 2899 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; |
| 2900 | else |
| 2901 | { |
| 2902 | switch (r_type) |
| 2903 | { |
| 2904 | case elfcpp::R_MIPS_26: |
| 2905 | return Relocatable_relocs::RELOC_SPECIAL; |
| 2906 | |
| 2907 | default: |
| 2908 | return Default_scan_relocatable_relocs<Classify_reloc>:: |
| 2909 | local_section_strategy(r_type, object); |
| 2910 | } |
| 2911 | } |
| 2912 | } |
| 2913 | }; |
| 2914 | |
| 2915 | // Mips_copy_relocs class. The only difference from the base class is the |
| 2916 | // method emit_mips, which should be called instead of Copy_reloc_entry::emit. |
| 2917 | // Mips cannot convert all relocation types to dynamic relocs. If a reloc |
| 2918 | // cannot be made dynamic, a COPY reloc is emitted. |
| 2919 | |
| 2920 | template<int sh_type, int size, bool big_endian> |
| 2921 | class Mips_copy_relocs : public Copy_relocs<sh_type, size, big_endian> |
| 2922 | { |
| 2923 | public: |
| 2924 | Mips_copy_relocs() |
| 2925 | : Copy_relocs<sh_type, size, big_endian>(elfcpp::R_MIPS_COPY) |
| 2926 | { } |
| 2927 | |
| 2928 | // Emit any saved relocations which turn out to be needed. This is |
| 2929 | // called after all the relocs have been scanned. |
| 2930 | void |
| 2931 | emit_mips(Output_data_reloc<sh_type, true, size, big_endian>*, |
| 2932 | Symbol_table*, Layout*, Target_mips<size, big_endian>*); |
| 2933 | |
| 2934 | private: |
| 2935 | typedef typename Copy_relocs<sh_type, size, big_endian>::Copy_reloc_entry |
| 2936 | Copy_reloc_entry; |
| 2937 | |
| 2938 | // Emit this reloc if appropriate. This is called after we have |
| 2939 | // scanned all the relocations, so we know whether we emitted a |
| 2940 | // COPY relocation for SYM_. |
| 2941 | void |
| 2942 | emit_entry(Copy_reloc_entry& entry, |
| 2943 | Output_data_reloc<sh_type, true, size, big_endian>* reloc_section, |
| 2944 | Symbol_table* symtab, Layout* layout, |
| 2945 | Target_mips<size, big_endian>* target); |
| 2946 | }; |
| 2947 | |
| 2948 | |
| 2949 | // Return true if the symbol SYM should be considered to resolve local |
| 2950 | // to the current module, and false otherwise. The logic is taken from |
| 2951 | // GNU ld's method _bfd_elf_symbol_refs_local_p. |
| 2952 | static bool |
| 2953 | symbol_refs_local(const Symbol* sym, bool has_dynsym_entry, |
| 2954 | bool local_protected) |
| 2955 | { |
| 2956 | // If it's a local sym, of course we resolve locally. |
| 2957 | if (sym == NULL) |
| 2958 | return true; |
| 2959 | |
| 2960 | // STV_HIDDEN or STV_INTERNAL ones must be local. |
| 2961 | if (sym->visibility() == elfcpp::STV_HIDDEN |
| 2962 | || sym->visibility() == elfcpp::STV_INTERNAL) |
| 2963 | return true; |
| 2964 | |
| 2965 | // If we don't have a definition in a regular file, then we can't |
| 2966 | // resolve locally. The sym is either undefined or dynamic. |
| 2967 | if (sym->is_from_dynobj() || sym->is_undefined()) |
| 2968 | return false; |
| 2969 | |
| 2970 | // Forced local symbols resolve locally. |
| 2971 | if (sym->is_forced_local()) |
| 2972 | return true; |
| 2973 | |
| 2974 | // As do non-dynamic symbols. |
| 2975 | if (!has_dynsym_entry) |
| 2976 | return true; |
| 2977 | |
| 2978 | // At this point, we know the symbol is defined and dynamic. In an |
| 2979 | // executable it must resolve locally, likewise when building symbolic |
| 2980 | // shared libraries. |
| 2981 | if (parameters->options().output_is_executable() |
| 2982 | || parameters->options().Bsymbolic()) |
| 2983 | return true; |
| 2984 | |
| 2985 | // Now deal with defined dynamic symbols in shared libraries. Ones |
| 2986 | // with default visibility might not resolve locally. |
| 2987 | if (sym->visibility() == elfcpp::STV_DEFAULT) |
| 2988 | return false; |
| 2989 | |
| 2990 | // STV_PROTECTED non-function symbols are local. |
| 2991 | if (sym->type() != elfcpp::STT_FUNC) |
| 2992 | return true; |
| 2993 | |
| 2994 | // Function pointer equality tests may require that STV_PROTECTED |
| 2995 | // symbols be treated as dynamic symbols. If the address of a |
| 2996 | // function not defined in an executable is set to that function's |
| 2997 | // plt entry in the executable, then the address of the function in |
| 2998 | // a shared library must also be the plt entry in the executable. |
| 2999 | return local_protected; |
| 3000 | } |
| 3001 | |
| 3002 | // Return TRUE if references to this symbol always reference the symbol in this |
| 3003 | // object. |
| 3004 | static bool |
| 3005 | symbol_references_local(const Symbol* sym, bool has_dynsym_entry) |
| 3006 | { |
| 3007 | return symbol_refs_local(sym, has_dynsym_entry, false); |
| 3008 | } |
| 3009 | |
| 3010 | // Return TRUE if calls to this symbol always call the version in this object. |
| 3011 | static bool |
| 3012 | symbol_calls_local(const Symbol* sym, bool has_dynsym_entry) |
| 3013 | { |
| 3014 | return symbol_refs_local(sym, has_dynsym_entry, true); |
| 3015 | } |
| 3016 | |
| 3017 | // Compare GOT offsets of two symbols. |
| 3018 | |
| 3019 | template<int size, bool big_endian> |
| 3020 | static bool |
| 3021 | got_offset_compare(Symbol* sym1, Symbol* sym2) |
| 3022 | { |
| 3023 | Mips_symbol<size>* mips_sym1 = Mips_symbol<size>::as_mips_sym(sym1); |
| 3024 | Mips_symbol<size>* mips_sym2 = Mips_symbol<size>::as_mips_sym(sym2); |
| 3025 | unsigned int area1 = mips_sym1->global_got_area(); |
| 3026 | unsigned int area2 = mips_sym2->global_got_area(); |
| 3027 | gold_assert(area1 != GGA_NONE && area1 != GGA_NONE); |
| 3028 | |
| 3029 | // GGA_NORMAL entries always come before GGA_RELOC_ONLY. |
| 3030 | if (area1 != area2) |
| 3031 | return area1 < area2; |
| 3032 | |
| 3033 | return mips_sym1->global_gotoffset() < mips_sym2->global_gotoffset(); |
| 3034 | } |
| 3035 | |
| 3036 | // This method divides dynamic symbols into symbols that have GOT entry, and |
| 3037 | // symbols that don't have GOT entry. It also sorts symbols with the GOT entry. |
| 3038 | // Mips ABI requires that symbols with the GOT entry must be at the end of |
| 3039 | // dynamic symbol table, and the order in dynamic symbol table must match the |
| 3040 | // order in GOT. |
| 3041 | |
| 3042 | template<int size, bool big_endian> |
| 3043 | static void |
| 3044 | reorder_dyn_symbols(std::vector<Symbol*>* dyn_symbols, |
| 3045 | std::vector<Symbol*>* non_got_symbols, |
| 3046 | std::vector<Symbol*>* got_symbols) |
| 3047 | { |
| 3048 | for (std::vector<Symbol*>::iterator p = dyn_symbols->begin(); |
| 3049 | p != dyn_symbols->end(); |
| 3050 | ++p) |
| 3051 | { |
| 3052 | Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(*p); |
| 3053 | if (mips_sym->global_got_area() == GGA_NORMAL |
| 3054 | || mips_sym->global_got_area() == GGA_RELOC_ONLY) |
| 3055 | got_symbols->push_back(mips_sym); |
| 3056 | else |
| 3057 | non_got_symbols->push_back(mips_sym); |
| 3058 | } |
| 3059 | |
| 3060 | std::sort(got_symbols->begin(), got_symbols->end(), |
| 3061 | got_offset_compare<size, big_endian>); |
| 3062 | } |
| 3063 | |
| 3064 | // Functor class for processing the global symbol table. |
| 3065 | |
| 3066 | template<int size, bool big_endian> |
| 3067 | class Symbol_visitor_check_symbols |
| 3068 | { |
| 3069 | public: |
| 3070 | Symbol_visitor_check_symbols(Target_mips<size, big_endian>* target, |
| 3071 | Layout* layout, Symbol_table* symtab) |
| 3072 | : target_(target), layout_(layout), symtab_(symtab) |
| 3073 | { } |
| 3074 | |
| 3075 | void |
| 3076 | operator()(Sized_symbol<size>* sym) |
| 3077 | { |
| 3078 | Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(sym); |
| 3079 | if (local_pic_function<size, big_endian>(mips_sym)) |
| 3080 | { |
| 3081 | // SYM is a function that might need $25 to be valid on entry. |
| 3082 | // If we're creating a non-PIC relocatable object, mark SYM as |
| 3083 | // being PIC. If we're creating a non-relocatable object with |
| 3084 | // non-PIC branches and jumps to SYM, make sure that SYM has an la25 |
| 3085 | // stub. |
| 3086 | if (parameters->options().relocatable()) |
| 3087 | { |
| 3088 | if (!parameters->options().output_is_position_independent()) |
| 3089 | mips_sym->set_pic(); |
| 3090 | } |
| 3091 | else if (mips_sym->has_nonpic_branches()) |
| 3092 | { |
| 3093 | this->target_->la25_stub_section(layout_) |
| 3094 | ->create_la25_stub(this->symtab_, this->target_, mips_sym); |
| 3095 | } |
| 3096 | } |
| 3097 | } |
| 3098 | |
| 3099 | private: |
| 3100 | Target_mips<size, big_endian>* target_; |
| 3101 | Layout* layout_; |
| 3102 | Symbol_table* symtab_; |
| 3103 | }; |
| 3104 | |
| 3105 | // Relocation types, parameterized by SHT_REL vs. SHT_RELA, size, |
| 3106 | // and endianness. The relocation format for MIPS-64 is non-standard. |
| 3107 | |
| 3108 | template<int sh_type, int size, bool big_endian> |
| 3109 | struct Mips_reloc_types; |
| 3110 | |
| 3111 | template<bool big_endian> |
| 3112 | struct Mips_reloc_types<elfcpp::SHT_REL, 32, big_endian> |
| 3113 | { |
| 3114 | typedef typename elfcpp::Rel<32, big_endian> Reloc; |
| 3115 | typedef typename elfcpp::Rel_write<32, big_endian> Reloc_write; |
| 3116 | |
| 3117 | static typename elfcpp::Elf_types<32>::Elf_Swxword |
| 3118 | get_r_addend(const Reloc*) |
| 3119 | { return 0; } |
| 3120 | |
| 3121 | static inline void |
| 3122 | set_reloc_addend(Reloc_write*, |
| 3123 | typename elfcpp::Elf_types<32>::Elf_Swxword) |
| 3124 | { gold_unreachable(); } |
| 3125 | }; |
| 3126 | |
| 3127 | template<bool big_endian> |
| 3128 | struct Mips_reloc_types<elfcpp::SHT_RELA, 32, big_endian> |
| 3129 | { |
| 3130 | typedef typename elfcpp::Rela<32, big_endian> Reloc; |
| 3131 | typedef typename elfcpp::Rela_write<32, big_endian> Reloc_write; |
| 3132 | |
| 3133 | static typename elfcpp::Elf_types<32>::Elf_Swxword |
| 3134 | get_r_addend(const Reloc* reloc) |
| 3135 | { return reloc->get_r_addend(); } |
| 3136 | |
| 3137 | static inline void |
| 3138 | set_reloc_addend(Reloc_write* p, |
| 3139 | typename elfcpp::Elf_types<32>::Elf_Swxword val) |
| 3140 | { p->put_r_addend(val); } |
| 3141 | }; |
| 3142 | |
| 3143 | template<bool big_endian> |
| 3144 | struct Mips_reloc_types<elfcpp::SHT_REL, 64, big_endian> |
| 3145 | { |
| 3146 | typedef typename elfcpp::Mips64_rel<big_endian> Reloc; |
| 3147 | typedef typename elfcpp::Mips64_rel_write<big_endian> Reloc_write; |
| 3148 | |
| 3149 | static typename elfcpp::Elf_types<64>::Elf_Swxword |
| 3150 | get_r_addend(const Reloc*) |
| 3151 | { return 0; } |
| 3152 | |
| 3153 | static inline void |
| 3154 | set_reloc_addend(Reloc_write*, |
| 3155 | typename elfcpp::Elf_types<64>::Elf_Swxword) |
| 3156 | { gold_unreachable(); } |
| 3157 | }; |
| 3158 | |
| 3159 | template<bool big_endian> |
| 3160 | struct Mips_reloc_types<elfcpp::SHT_RELA, 64, big_endian> |
| 3161 | { |
| 3162 | typedef typename elfcpp::Mips64_rela<big_endian> Reloc; |
| 3163 | typedef typename elfcpp::Mips64_rela_write<big_endian> Reloc_write; |
| 3164 | |
| 3165 | static typename elfcpp::Elf_types<64>::Elf_Swxword |
| 3166 | get_r_addend(const Reloc* reloc) |
| 3167 | { return reloc->get_r_addend(); } |
| 3168 | |
| 3169 | static inline void |
| 3170 | set_reloc_addend(Reloc_write* p, |
| 3171 | typename elfcpp::Elf_types<64>::Elf_Swxword val) |
| 3172 | { p->put_r_addend(val); } |
| 3173 | }; |
| 3174 | |
| 3175 | // Forward declaration. |
| 3176 | static unsigned int |
| 3177 | mips_get_size_for_reloc(unsigned int, Relobj*); |
| 3178 | |
| 3179 | // A class for inquiring about properties of a relocation, |
| 3180 | // used while scanning relocs during a relocatable link and |
| 3181 | // garbage collection. |
| 3182 | |
| 3183 | template<int sh_type_, int size, bool big_endian> |
| 3184 | class Mips_classify_reloc; |
| 3185 | |
| 3186 | template<int sh_type_, bool big_endian> |
| 3187 | class Mips_classify_reloc<sh_type_, 32, big_endian> : |
| 3188 | public gold::Default_classify_reloc<sh_type_, 32, big_endian> |
| 3189 | { |
| 3190 | public: |
| 3191 | typedef typename Mips_reloc_types<sh_type_, 32, big_endian>::Reloc |
| 3192 | Reltype; |
| 3193 | typedef typename Mips_reloc_types<sh_type_, 32, big_endian>::Reloc_write |
| 3194 | Reltype_write; |
| 3195 | |
| 3196 | // Return the symbol referred to by the relocation. |
| 3197 | static inline unsigned int |
| 3198 | get_r_sym(const Reltype* reloc) |
| 3199 | { return elfcpp::elf_r_sym<32>(reloc->get_r_info()); } |
| 3200 | |
| 3201 | // Return the type of the relocation. |
| 3202 | static inline unsigned int |
| 3203 | get_r_type(const Reltype* reloc) |
| 3204 | { return elfcpp::elf_r_type<32>(reloc->get_r_info()); } |
| 3205 | |
| 3206 | static inline unsigned int |
| 3207 | get_r_type2(const Reltype*) |
| 3208 | { return 0; } |
| 3209 | |
| 3210 | static inline unsigned int |
| 3211 | get_r_type3(const Reltype*) |
| 3212 | { return 0; } |
| 3213 | |
| 3214 | static inline unsigned int |
| 3215 | get_r_ssym(const Reltype*) |
| 3216 | { return 0; } |
| 3217 | |
| 3218 | // Return the explicit addend of the relocation (return 0 for SHT_REL). |
| 3219 | static inline unsigned int |
| 3220 | get_r_addend(const Reltype* reloc) |
| 3221 | { |
| 3222 | if (sh_type_ == elfcpp::SHT_REL) |
| 3223 | return 0; |
| 3224 | return Mips_reloc_types<sh_type_, 32, big_endian>::get_r_addend(reloc); |
| 3225 | } |
| 3226 | |
| 3227 | // Write the r_info field to a new reloc, using the r_info field from |
| 3228 | // the original reloc, replacing the r_sym field with R_SYM. |
| 3229 | static inline void |
| 3230 | put_r_info(Reltype_write* new_reloc, Reltype* reloc, unsigned int r_sym) |
| 3231 | { |
| 3232 | unsigned int r_type = elfcpp::elf_r_type<32>(reloc->get_r_info()); |
| 3233 | new_reloc->put_r_info(elfcpp::elf_r_info<32>(r_sym, r_type)); |
| 3234 | } |
| 3235 | |
| 3236 | // Write the r_addend field to a new reloc. |
| 3237 | static inline void |
| 3238 | put_r_addend(Reltype_write* to, |
| 3239 | typename elfcpp::Elf_types<32>::Elf_Swxword addend) |
| 3240 | { Mips_reloc_types<sh_type_, 32, big_endian>::set_reloc_addend(to, addend); } |
| 3241 | |
| 3242 | // Return the size of the addend of the relocation (only used for SHT_REL). |
| 3243 | static unsigned int |
| 3244 | get_size_for_reloc(unsigned int r_type, Relobj* obj) |
| 3245 | { return mips_get_size_for_reloc(r_type, obj); } |
| 3246 | }; |
| 3247 | |
| 3248 | template<int sh_type_, bool big_endian> |
| 3249 | class Mips_classify_reloc<sh_type_, 64, big_endian> : |
| 3250 | public gold::Default_classify_reloc<sh_type_, 64, big_endian> |
| 3251 | { |
| 3252 | public: |
| 3253 | typedef typename Mips_reloc_types<sh_type_, 64, big_endian>::Reloc |
| 3254 | Reltype; |
| 3255 | typedef typename Mips_reloc_types<sh_type_, 64, big_endian>::Reloc_write |
| 3256 | Reltype_write; |
| 3257 | |
| 3258 | // Return the symbol referred to by the relocation. |
| 3259 | static inline unsigned int |
| 3260 | get_r_sym(const Reltype* reloc) |
| 3261 | { return reloc->get_r_sym(); } |
| 3262 | |
| 3263 | // Return the r_type of the relocation. |
| 3264 | static inline unsigned int |
| 3265 | get_r_type(const Reltype* reloc) |
| 3266 | { return reloc->get_r_type(); } |
| 3267 | |
| 3268 | // Return the r_type2 of the relocation. |
| 3269 | static inline unsigned int |
| 3270 | get_r_type2(const Reltype* reloc) |
| 3271 | { return reloc->get_r_type2(); } |
| 3272 | |
| 3273 | // Return the r_type3 of the relocation. |
| 3274 | static inline unsigned int |
| 3275 | get_r_type3(const Reltype* reloc) |
| 3276 | { return reloc->get_r_type3(); } |
| 3277 | |
| 3278 | // Return the special symbol of the relocation. |
| 3279 | static inline unsigned int |
| 3280 | get_r_ssym(const Reltype* reloc) |
| 3281 | { return reloc->get_r_ssym(); } |
| 3282 | |
| 3283 | // Return the explicit addend of the relocation (return 0 for SHT_REL). |
| 3284 | static inline typename elfcpp::Elf_types<64>::Elf_Swxword |
| 3285 | get_r_addend(const Reltype* reloc) |
| 3286 | { |
| 3287 | if (sh_type_ == elfcpp::SHT_REL) |
| 3288 | return 0; |
| 3289 | return Mips_reloc_types<sh_type_, 64, big_endian>::get_r_addend(reloc); |
| 3290 | } |
| 3291 | |
| 3292 | // Write the r_info field to a new reloc, using the r_info field from |
| 3293 | // the original reloc, replacing the r_sym field with R_SYM. |
| 3294 | static inline void |
| 3295 | put_r_info(Reltype_write* new_reloc, Reltype* reloc, unsigned int r_sym) |
| 3296 | { |
| 3297 | new_reloc->put_r_sym(r_sym); |
| 3298 | new_reloc->put_r_ssym(reloc->get_r_ssym()); |
| 3299 | new_reloc->put_r_type3(reloc->get_r_type3()); |
| 3300 | new_reloc->put_r_type2(reloc->get_r_type2()); |
| 3301 | new_reloc->put_r_type(reloc->get_r_type()); |
| 3302 | } |
| 3303 | |
| 3304 | // Write the r_addend field to a new reloc. |
| 3305 | static inline void |
| 3306 | put_r_addend(Reltype_write* to, |
| 3307 | typename elfcpp::Elf_types<64>::Elf_Swxword addend) |
| 3308 | { Mips_reloc_types<sh_type_, 64, big_endian>::set_reloc_addend(to, addend); } |
| 3309 | |
| 3310 | // Return the size of the addend of the relocation (only used for SHT_REL). |
| 3311 | static unsigned int |
| 3312 | get_size_for_reloc(unsigned int r_type, Relobj* obj) |
| 3313 | { return mips_get_size_for_reloc(r_type, obj); } |
| 3314 | }; |
| 3315 | |
| 3316 | template<int size, bool big_endian> |
| 3317 | class Target_mips : public Sized_target<size, big_endian> |
| 3318 | { |
| 3319 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 3320 | typedef Mips_output_data_reloc<elfcpp::SHT_REL, true, size, big_endian> |
| 3321 | Reloc_section; |
| 3322 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype32; |
| 3323 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| 3324 | typedef typename Mips_reloc_types<elfcpp::SHT_REL, size, big_endian>::Reloc |
| 3325 | Reltype; |
| 3326 | typedef typename Mips_reloc_types<elfcpp::SHT_RELA, size, big_endian>::Reloc |
| 3327 | Relatype; |
| 3328 | |
| 3329 | public: |
| 3330 | Target_mips(const Target::Target_info* info = &mips_info) |
| 3331 | : Sized_target<size, big_endian>(info), got_(NULL), gp_(NULL), plt_(NULL), |
| 3332 | got_plt_(NULL), rel_dyn_(NULL), rld_map_(NULL), copy_relocs_(), |
| 3333 | dyn_relocs_(), la25_stub_(NULL), mips_mach_extensions_(), |
| 3334 | mips_stubs_(NULL), attributes_section_data_(NULL), abiflags_(NULL), |
| 3335 | mach_(0), layout_(NULL), got16_addends_(), has_abiflags_section_(false), |
| 3336 | entry_symbol_is_compressed_(false), insn32_(false) |
| 3337 | { |
| 3338 | this->add_machine_extensions(); |
| 3339 | } |
| 3340 | |
| 3341 | // The offset of $gp from the beginning of the .got section. |
| 3342 | static const unsigned int MIPS_GP_OFFSET = 0x7ff0; |
| 3343 | |
| 3344 | // The maximum size of the GOT for it to be addressable using 16-bit |
| 3345 | // offsets from $gp. |
| 3346 | static const unsigned int MIPS_GOT_MAX_SIZE = MIPS_GP_OFFSET + 0x7fff; |
| 3347 | |
| 3348 | // Make a new symbol table entry for the Mips target. |
| 3349 | Sized_symbol<size>* |
| 3350 | make_symbol(const char*, elfcpp::STT, Object*, unsigned int, uint64_t) |
| 3351 | { return new Mips_symbol<size>(); } |
| 3352 | |
| 3353 | // Process the relocations to determine unreferenced sections for |
| 3354 | // garbage collection. |
| 3355 | void |
| 3356 | gc_process_relocs(Symbol_table* symtab, |
| 3357 | Layout* layout, |
| 3358 | Sized_relobj_file<size, big_endian>* object, |
| 3359 | unsigned int data_shndx, |
| 3360 | unsigned int sh_type, |
| 3361 | const unsigned char* prelocs, |
| 3362 | size_t reloc_count, |
| 3363 | Output_section* output_section, |
| 3364 | bool needs_special_offset_handling, |
| 3365 | size_t local_symbol_count, |
| 3366 | const unsigned char* plocal_symbols); |
| 3367 | |
| 3368 | // Scan the relocations to look for symbol adjustments. |
| 3369 | void |
| 3370 | scan_relocs(Symbol_table* symtab, |
| 3371 | Layout* layout, |
| 3372 | Sized_relobj_file<size, big_endian>* object, |
| 3373 | unsigned int data_shndx, |
| 3374 | unsigned int sh_type, |
| 3375 | const unsigned char* prelocs, |
| 3376 | size_t reloc_count, |
| 3377 | Output_section* output_section, |
| 3378 | bool needs_special_offset_handling, |
| 3379 | size_t local_symbol_count, |
| 3380 | const unsigned char* plocal_symbols); |
| 3381 | |
| 3382 | // Finalize the sections. |
| 3383 | void |
| 3384 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
| 3385 | |
| 3386 | // Relocate a section. |
| 3387 | void |
| 3388 | relocate_section(const Relocate_info<size, big_endian>*, |
| 3389 | unsigned int sh_type, |
| 3390 | const unsigned char* prelocs, |
| 3391 | size_t reloc_count, |
| 3392 | Output_section* output_section, |
| 3393 | bool needs_special_offset_handling, |
| 3394 | unsigned char* view, |
| 3395 | Mips_address view_address, |
| 3396 | section_size_type view_size, |
| 3397 | const Reloc_symbol_changes*); |
| 3398 | |
| 3399 | // Scan the relocs during a relocatable link. |
| 3400 | void |
| 3401 | scan_relocatable_relocs(Symbol_table* symtab, |
| 3402 | Layout* layout, |
| 3403 | Sized_relobj_file<size, big_endian>* object, |
| 3404 | unsigned int data_shndx, |
| 3405 | unsigned int sh_type, |
| 3406 | const unsigned char* prelocs, |
| 3407 | size_t reloc_count, |
| 3408 | Output_section* output_section, |
| 3409 | bool needs_special_offset_handling, |
| 3410 | size_t local_symbol_count, |
| 3411 | const unsigned char* plocal_symbols, |
| 3412 | Relocatable_relocs*); |
| 3413 | |
| 3414 | // Scan the relocs for --emit-relocs. |
| 3415 | void |
| 3416 | emit_relocs_scan(Symbol_table* symtab, |
| 3417 | Layout* layout, |
| 3418 | Sized_relobj_file<size, big_endian>* object, |
| 3419 | unsigned int data_shndx, |
| 3420 | unsigned int sh_type, |
| 3421 | const unsigned char* prelocs, |
| 3422 | size_t reloc_count, |
| 3423 | Output_section* output_section, |
| 3424 | bool needs_special_offset_handling, |
| 3425 | size_t local_symbol_count, |
| 3426 | const unsigned char* plocal_syms, |
| 3427 | Relocatable_relocs* rr); |
| 3428 | |
| 3429 | // Emit relocations for a section. |
| 3430 | void |
| 3431 | relocate_relocs(const Relocate_info<size, big_endian>*, |
| 3432 | unsigned int sh_type, |
| 3433 | const unsigned char* prelocs, |
| 3434 | size_t reloc_count, |
| 3435 | Output_section* output_section, |
| 3436 | typename elfcpp::Elf_types<size>::Elf_Off |
| 3437 | offset_in_output_section, |
| 3438 | unsigned char* view, |
| 3439 | Mips_address view_address, |
| 3440 | section_size_type view_size, |
| 3441 | unsigned char* reloc_view, |
| 3442 | section_size_type reloc_view_size); |
| 3443 | |
| 3444 | // Perform target-specific processing in a relocatable link. This is |
| 3445 | // only used if we use the relocation strategy RELOC_SPECIAL. |
| 3446 | void |
| 3447 | relocate_special_relocatable(const Relocate_info<size, big_endian>* relinfo, |
| 3448 | unsigned int sh_type, |
| 3449 | const unsigned char* preloc_in, |
| 3450 | size_t relnum, |
| 3451 | Output_section* output_section, |
| 3452 | typename elfcpp::Elf_types<size>::Elf_Off |
| 3453 | offset_in_output_section, |
| 3454 | unsigned char* view, |
| 3455 | Mips_address view_address, |
| 3456 | section_size_type view_size, |
| 3457 | unsigned char* preloc_out); |
| 3458 | |
| 3459 | // Return whether SYM is defined by the ABI. |
| 3460 | bool |
| 3461 | do_is_defined_by_abi(const Symbol* sym) const |
| 3462 | { |
| 3463 | return ((strcmp(sym->name(), "__gnu_local_gp") == 0) |
| 3464 | || (strcmp(sym->name(), "_gp_disp") == 0) |
| 3465 | || (strcmp(sym->name(), "___tls_get_addr") == 0)); |
| 3466 | } |
| 3467 | |
| 3468 | // Return the number of entries in the GOT. |
| 3469 | unsigned int |
| 3470 | got_entry_count() const |
| 3471 | { |
| 3472 | if (!this->has_got_section()) |
| 3473 | return 0; |
| 3474 | return this->got_size() / (size/8); |
| 3475 | } |
| 3476 | |
| 3477 | // Return the number of entries in the PLT. |
| 3478 | unsigned int |
| 3479 | plt_entry_count() const |
| 3480 | { |
| 3481 | if (this->plt_ == NULL) |
| 3482 | return 0; |
| 3483 | return this->plt_->entry_count(); |
| 3484 | } |
| 3485 | |
| 3486 | // Return the offset of the first non-reserved PLT entry. |
| 3487 | unsigned int |
| 3488 | first_plt_entry_offset() const |
| 3489 | { return this->plt_->first_plt_entry_offset(); } |
| 3490 | |
| 3491 | // Return the size of each PLT entry. |
| 3492 | unsigned int |
| 3493 | plt_entry_size() const |
| 3494 | { return this->plt_->plt_entry_size(); } |
| 3495 | |
| 3496 | // Get the GOT section, creating it if necessary. |
| 3497 | Mips_output_data_got<size, big_endian>* |
| 3498 | got_section(Symbol_table*, Layout*); |
| 3499 | |
| 3500 | // Get the GOT section. |
| 3501 | Mips_output_data_got<size, big_endian>* |
| 3502 | got_section() const |
| 3503 | { |
| 3504 | gold_assert(this->got_ != NULL); |
| 3505 | return this->got_; |
| 3506 | } |
| 3507 | |
| 3508 | // Get the .MIPS.stubs section, creating it if necessary. |
| 3509 | Mips_output_data_mips_stubs<size, big_endian>* |
| 3510 | mips_stubs_section(Layout* layout); |
| 3511 | |
| 3512 | // Get the .MIPS.stubs section. |
| 3513 | Mips_output_data_mips_stubs<size, big_endian>* |
| 3514 | mips_stubs_section() const |
| 3515 | { |
| 3516 | gold_assert(this->mips_stubs_ != NULL); |
| 3517 | return this->mips_stubs_; |
| 3518 | } |
| 3519 | |
| 3520 | // Get the LA25 stub section, creating it if necessary. |
| 3521 | Mips_output_data_la25_stub<size, big_endian>* |
| 3522 | la25_stub_section(Layout*); |
| 3523 | |
| 3524 | // Get the LA25 stub section. |
| 3525 | Mips_output_data_la25_stub<size, big_endian>* |
| 3526 | la25_stub_section() |
| 3527 | { |
| 3528 | gold_assert(this->la25_stub_ != NULL); |
| 3529 | return this->la25_stub_; |
| 3530 | } |
| 3531 | |
| 3532 | // Get gp value. It has the value of .got + 0x7FF0. |
| 3533 | Mips_address |
| 3534 | gp_value() const |
| 3535 | { |
| 3536 | if (this->gp_ != NULL) |
| 3537 | return this->gp_->value(); |
| 3538 | return 0; |
| 3539 | } |
| 3540 | |
| 3541 | // Get gp value. It has the value of .got + 0x7FF0. Adjust it for |
| 3542 | // multi-GOT links so that OBJECT's GOT + 0x7FF0 is returned. |
| 3543 | Mips_address |
| 3544 | adjusted_gp_value(const Mips_relobj<size, big_endian>* object) |
| 3545 | { |
| 3546 | if (this->gp_ == NULL) |
| 3547 | return 0; |
| 3548 | |
| 3549 | bool multi_got = false; |
| 3550 | if (this->has_got_section()) |
| 3551 | multi_got = this->got_section()->multi_got(); |
| 3552 | if (!multi_got) |
| 3553 | return this->gp_->value(); |
| 3554 | else |
| 3555 | return this->gp_->value() + this->got_section()->get_got_offset(object); |
| 3556 | } |
| 3557 | |
| 3558 | // Get the dynamic reloc section, creating it if necessary. |
| 3559 | Reloc_section* |
| 3560 | rel_dyn_section(Layout*); |
| 3561 | |
| 3562 | bool |
| 3563 | do_has_custom_set_dynsym_indexes() const |
| 3564 | { return true; } |
| 3565 | |
| 3566 | // Don't emit input .reginfo/.MIPS.abiflags sections to |
| 3567 | // output .reginfo/.MIPS.abiflags. |
| 3568 | bool |
| 3569 | do_should_include_section(elfcpp::Elf_Word sh_type) const |
| 3570 | { |
| 3571 | return ((sh_type != elfcpp::SHT_MIPS_REGINFO) |
| 3572 | && (sh_type != elfcpp::SHT_MIPS_ABIFLAGS)); |
| 3573 | } |
| 3574 | |
| 3575 | // Set the dynamic symbol indexes. INDEX is the index of the first |
| 3576 | // global dynamic symbol. Pointers to the symbols are stored into the |
| 3577 | // vector SYMS. The names are added to DYNPOOL. This returns an |
| 3578 | // updated dynamic symbol index. |
| 3579 | unsigned int |
| 3580 | do_set_dynsym_indexes(std::vector<Symbol*>* dyn_symbols, unsigned int index, |
| 3581 | std::vector<Symbol*>* syms, Stringpool* dynpool, |
| 3582 | Versions* versions, Symbol_table* symtab) const; |
| 3583 | |
| 3584 | // Remove .MIPS.stubs entry for a symbol. |
| 3585 | void |
| 3586 | remove_lazy_stub_entry(Mips_symbol<size>* sym) |
| 3587 | { |
| 3588 | if (this->mips_stubs_ != NULL) |
| 3589 | this->mips_stubs_->remove_entry(sym); |
| 3590 | } |
| 3591 | |
| 3592 | // The value to write into got[1] for SVR4 targets, to identify it is |
| 3593 | // a GNU object. The dynamic linker can then use got[1] to store the |
| 3594 | // module pointer. |
| 3595 | uint64_t |
| 3596 | mips_elf_gnu_got1_mask() |
| 3597 | { |
| 3598 | if (this->is_output_n64()) |
| 3599 | return (uint64_t)1 << 63; |
| 3600 | else |
| 3601 | return 1 << 31; |
| 3602 | } |
| 3603 | |
| 3604 | // Whether the output has microMIPS code. This is valid only after |
| 3605 | // merge_obj_e_flags() is called. |
| 3606 | bool |
| 3607 | is_output_micromips() const |
| 3608 | { |
| 3609 | gold_assert(this->are_processor_specific_flags_set()); |
| 3610 | return elfcpp::is_micromips(this->processor_specific_flags()); |
| 3611 | } |
| 3612 | |
| 3613 | // Whether the output uses N32 ABI. This is valid only after |
| 3614 | // merge_obj_e_flags() is called. |
| 3615 | bool |
| 3616 | is_output_n32() const |
| 3617 | { |
| 3618 | gold_assert(this->are_processor_specific_flags_set()); |
| 3619 | return elfcpp::abi_n32(this->processor_specific_flags()); |
| 3620 | } |
| 3621 | |
| 3622 | // Whether the output uses R6 ISA. This is valid only after |
| 3623 | // merge_obj_e_flags() is called. |
| 3624 | bool |
| 3625 | is_output_r6() const |
| 3626 | { |
| 3627 | gold_assert(this->are_processor_specific_flags_set()); |
| 3628 | return elfcpp::r6_isa(this->processor_specific_flags()); |
| 3629 | } |
| 3630 | |
| 3631 | // Whether the output uses N64 ABI. |
| 3632 | bool |
| 3633 | is_output_n64() const |
| 3634 | { return size == 64; } |
| 3635 | |
| 3636 | // Whether the output uses NEWABI. This is valid only after |
| 3637 | // merge_obj_e_flags() is called. |
| 3638 | bool |
| 3639 | is_output_newabi() const |
| 3640 | { return this->is_output_n32() || this->is_output_n64(); } |
| 3641 | |
| 3642 | // Whether we can only use 32-bit microMIPS instructions. |
| 3643 | bool |
| 3644 | use_32bit_micromips_instructions() const |
| 3645 | { return this->insn32_; } |
| 3646 | |
| 3647 | // Return the r_sym field from a relocation. |
| 3648 | unsigned int |
| 3649 | get_r_sym(const unsigned char* preloc) const |
| 3650 | { |
| 3651 | // Since REL and RELA relocs share the same structure through |
| 3652 | // the r_info field, we can just use REL here. |
| 3653 | Reltype rel(preloc); |
| 3654 | return Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian>:: |
| 3655 | get_r_sym(&rel); |
| 3656 | } |
| 3657 | |
| 3658 | protected: |
| 3659 | // Return the value to use for a dynamic symbol which requires special |
| 3660 | // treatment. This is how we support equality comparisons of function |
| 3661 | // pointers across shared library boundaries, as described in the |
| 3662 | // processor specific ABI supplement. |
| 3663 | uint64_t |
| 3664 | do_dynsym_value(const Symbol* gsym) const; |
| 3665 | |
| 3666 | // Make an ELF object. |
| 3667 | Object* |
| 3668 | do_make_elf_object(const std::string&, Input_file*, off_t, |
| 3669 | const elfcpp::Ehdr<size, big_endian>& ehdr); |
| 3670 | |
| 3671 | Object* |
| 3672 | do_make_elf_object(const std::string&, Input_file*, off_t, |
| 3673 | const elfcpp::Ehdr<size, !big_endian>&) |
| 3674 | { gold_unreachable(); } |
| 3675 | |
| 3676 | // Make an output section. |
| 3677 | Output_section* |
| 3678 | do_make_output_section(const char* name, elfcpp::Elf_Word type, |
| 3679 | elfcpp::Elf_Xword flags) |
| 3680 | { |
| 3681 | if (type == elfcpp::SHT_MIPS_OPTIONS) |
| 3682 | return new Mips_output_section_options<size, big_endian>(name, type, |
| 3683 | flags, this); |
| 3684 | else |
| 3685 | return new Output_section(name, type, flags); |
| 3686 | } |
| 3687 | |
| 3688 | // Adjust ELF file header. |
| 3689 | void |
| 3690 | do_adjust_elf_header(unsigned char* view, int len); |
| 3691 | |
| 3692 | // Get the custom dynamic tag value. |
| 3693 | unsigned int |
| 3694 | do_dynamic_tag_custom_value(elfcpp::DT) const; |
| 3695 | |
| 3696 | // Adjust the value written to the dynamic symbol table. |
| 3697 | virtual void |
| 3698 | do_adjust_dyn_symbol(const Symbol* sym, unsigned char* view) const |
| 3699 | { |
| 3700 | elfcpp::Sym<size, big_endian> isym(view); |
| 3701 | elfcpp::Sym_write<size, big_endian> osym(view); |
| 3702 | const Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(sym); |
| 3703 | |
| 3704 | // Keep dynamic compressed symbols odd. This allows the dynamic linker |
| 3705 | // to treat compressed symbols like any other. |
| 3706 | Mips_address value = isym.get_st_value(); |
| 3707 | if (mips_sym->is_mips16() && value != 0) |
| 3708 | { |
| 3709 | if (!mips_sym->has_mips16_fn_stub()) |
| 3710 | value |= 1; |
| 3711 | else |
| 3712 | { |
| 3713 | // If we have a MIPS16 function with a stub, the dynamic symbol |
| 3714 | // must refer to the stub, since only the stub uses the standard |
| 3715 | // calling conventions. Stub contains MIPS32 code, so don't add +1 |
| 3716 | // in this case. |
| 3717 | |
| 3718 | // There is a code which does this in the method |
| 3719 | // Target_mips::do_dynsym_value, but that code will only be |
| 3720 | // executed if the symbol is from dynobj. |
| 3721 | // TODO(sasa): GNU ld also changes the value in non-dynamic symbol |
| 3722 | // table. |
| 3723 | |
| 3724 | Mips16_stub_section<size, big_endian>* fn_stub = |
| 3725 | mips_sym->template get_mips16_fn_stub<big_endian>(); |
| 3726 | value = fn_stub->output_address(); |
| 3727 | osym.put_st_size(fn_stub->section_size()); |
| 3728 | } |
| 3729 | |
| 3730 | osym.put_st_value(value); |
| 3731 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), |
| 3732 | mips_sym->nonvis() - (elfcpp::STO_MIPS16 >> 2))); |
| 3733 | } |
| 3734 | else if ((mips_sym->is_micromips() |
| 3735 | // Stubs are always microMIPS if there is any microMIPS code in |
| 3736 | // the output. |
| 3737 | || (this->is_output_micromips() && mips_sym->has_lazy_stub())) |
| 3738 | && value != 0) |
| 3739 | { |
| 3740 | osym.put_st_value(value | 1); |
| 3741 | osym.put_st_other(elfcpp::elf_st_other(sym->visibility(), |
| 3742 | mips_sym->nonvis() - (elfcpp::STO_MICROMIPS >> 2))); |
| 3743 | } |
| 3744 | } |
| 3745 | |
| 3746 | private: |
| 3747 | // The class which scans relocations. |
| 3748 | class Scan |
| 3749 | { |
| 3750 | public: |
| 3751 | Scan() |
| 3752 | { } |
| 3753 | |
| 3754 | static inline int |
| 3755 | get_reference_flags(unsigned int r_type); |
| 3756 | |
| 3757 | inline void |
| 3758 | local(Symbol_table* symtab, Layout* layout, Target_mips* target, |
| 3759 | Sized_relobj_file<size, big_endian>* object, |
| 3760 | unsigned int data_shndx, |
| 3761 | Output_section* output_section, |
| 3762 | const Reltype& reloc, unsigned int r_type, |
| 3763 | const elfcpp::Sym<size, big_endian>& lsym, |
| 3764 | bool is_discarded); |
| 3765 | |
| 3766 | inline void |
| 3767 | local(Symbol_table* symtab, Layout* layout, Target_mips* target, |
| 3768 | Sized_relobj_file<size, big_endian>* object, |
| 3769 | unsigned int data_shndx, |
| 3770 | Output_section* output_section, |
| 3771 | const Relatype& reloc, unsigned int r_type, |
| 3772 | const elfcpp::Sym<size, big_endian>& lsym, |
| 3773 | bool is_discarded); |
| 3774 | |
| 3775 | inline void |
| 3776 | local(Symbol_table* symtab, Layout* layout, Target_mips* target, |
| 3777 | Sized_relobj_file<size, big_endian>* object, |
| 3778 | unsigned int data_shndx, |
| 3779 | Output_section* output_section, |
| 3780 | const Relatype* rela, |
| 3781 | const Reltype* rel, |
| 3782 | unsigned int rel_type, |
| 3783 | unsigned int r_type, |
| 3784 | const elfcpp::Sym<size, big_endian>& lsym, |
| 3785 | bool is_discarded); |
| 3786 | |
| 3787 | inline void |
| 3788 | global(Symbol_table* symtab, Layout* layout, Target_mips* target, |
| 3789 | Sized_relobj_file<size, big_endian>* object, |
| 3790 | unsigned int data_shndx, |
| 3791 | Output_section* output_section, |
| 3792 | const Reltype& reloc, unsigned int r_type, |
| 3793 | Symbol* gsym); |
| 3794 | |
| 3795 | inline void |
| 3796 | global(Symbol_table* symtab, Layout* layout, Target_mips* target, |
| 3797 | Sized_relobj_file<size, big_endian>* object, |
| 3798 | unsigned int data_shndx, |
| 3799 | Output_section* output_section, |
| 3800 | const Relatype& reloc, unsigned int r_type, |
| 3801 | Symbol* gsym); |
| 3802 | |
| 3803 | inline void |
| 3804 | global(Symbol_table* symtab, Layout* layout, Target_mips* target, |
| 3805 | Sized_relobj_file<size, big_endian>* object, |
| 3806 | unsigned int data_shndx, |
| 3807 | Output_section* output_section, |
| 3808 | const Relatype* rela, |
| 3809 | const Reltype* rel, |
| 3810 | unsigned int rel_type, |
| 3811 | unsigned int r_type, |
| 3812 | Symbol* gsym); |
| 3813 | |
| 3814 | inline bool |
| 3815 | local_reloc_may_be_function_pointer(Symbol_table* , Layout*, |
| 3816 | Target_mips*, |
| 3817 | Sized_relobj_file<size, big_endian>*, |
| 3818 | unsigned int, |
| 3819 | Output_section*, |
| 3820 | const Reltype&, |
| 3821 | unsigned int, |
| 3822 | const elfcpp::Sym<size, big_endian>&) |
| 3823 | { return false; } |
| 3824 | |
| 3825 | inline bool |
| 3826 | global_reloc_may_be_function_pointer(Symbol_table*, Layout*, |
| 3827 | Target_mips*, |
| 3828 | Sized_relobj_file<size, big_endian>*, |
| 3829 | unsigned int, |
| 3830 | Output_section*, |
| 3831 | const Reltype&, |
| 3832 | unsigned int, Symbol*) |
| 3833 | { return false; } |
| 3834 | |
| 3835 | inline bool |
| 3836 | local_reloc_may_be_function_pointer(Symbol_table*, Layout*, |
| 3837 | Target_mips*, |
| 3838 | Sized_relobj_file<size, big_endian>*, |
| 3839 | unsigned int, |
| 3840 | Output_section*, |
| 3841 | const Relatype&, |
| 3842 | unsigned int, |
| 3843 | const elfcpp::Sym<size, big_endian>&) |
| 3844 | { return false; } |
| 3845 | |
| 3846 | inline bool |
| 3847 | global_reloc_may_be_function_pointer(Symbol_table*, Layout*, |
| 3848 | Target_mips*, |
| 3849 | Sized_relobj_file<size, big_endian>*, |
| 3850 | unsigned int, |
| 3851 | Output_section*, |
| 3852 | const Relatype&, |
| 3853 | unsigned int, Symbol*) |
| 3854 | { return false; } |
| 3855 | private: |
| 3856 | static void |
| 3857 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, |
| 3858 | unsigned int r_type); |
| 3859 | |
| 3860 | static void |
| 3861 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, |
| 3862 | unsigned int r_type, Symbol*); |
| 3863 | }; |
| 3864 | |
| 3865 | // The class which implements relocation. |
| 3866 | class Relocate |
| 3867 | { |
| 3868 | public: |
| 3869 | Relocate() |
| 3870 | : calculated_value_(0), calculate_only_(false) |
| 3871 | { } |
| 3872 | |
| 3873 | ~Relocate() |
| 3874 | { } |
| 3875 | |
| 3876 | // Return whether a R_MIPS_32/R_MIPS_64 relocation needs to be applied. |
| 3877 | inline bool |
| 3878 | should_apply_static_reloc(const Mips_symbol<size>* gsym, |
| 3879 | unsigned int r_type, |
| 3880 | Output_section* output_section, |
| 3881 | Target_mips* target); |
| 3882 | |
| 3883 | // Do a relocation. Return false if the caller should not issue |
| 3884 | // any warnings about this relocation. |
| 3885 | inline bool |
| 3886 | relocate(const Relocate_info<size, big_endian>*, unsigned int, |
| 3887 | Target_mips*, Output_section*, size_t, const unsigned char*, |
| 3888 | const Sized_symbol<size>*, const Symbol_value<size>*, |
| 3889 | unsigned char*, Mips_address, section_size_type); |
| 3890 | |
| 3891 | private: |
| 3892 | // Result of the relocation. |
| 3893 | Valtype calculated_value_; |
| 3894 | // Whether we have to calculate relocation instead of applying it. |
| 3895 | bool calculate_only_; |
| 3896 | }; |
| 3897 | |
| 3898 | // This POD class holds the dynamic relocations that should be emitted instead |
| 3899 | // of R_MIPS_32, R_MIPS_REL32 and R_MIPS_64 relocations. We will emit these |
| 3900 | // relocations if it turns out that the symbol does not have static |
| 3901 | // relocations. |
| 3902 | class Dyn_reloc |
| 3903 | { |
| 3904 | public: |
| 3905 | Dyn_reloc(Mips_symbol<size>* sym, unsigned int r_type, |
| 3906 | Mips_relobj<size, big_endian>* relobj, unsigned int shndx, |
| 3907 | Output_section* output_section, Mips_address r_offset) |
| 3908 | : sym_(sym), r_type_(r_type), relobj_(relobj), |
| 3909 | shndx_(shndx), output_section_(output_section), |
| 3910 | r_offset_(r_offset) |
| 3911 | { } |
| 3912 | |
| 3913 | // Emit this reloc if appropriate. This is called after we have |
| 3914 | // scanned all the relocations, so we know whether the symbol has |
| 3915 | // static relocations. |
| 3916 | void |
| 3917 | emit(Reloc_section* rel_dyn, Mips_output_data_got<size, big_endian>* got, |
| 3918 | Symbol_table* symtab) |
| 3919 | { |
| 3920 | if (!this->sym_->has_static_relocs()) |
| 3921 | { |
| 3922 | got->record_global_got_symbol(this->sym_, this->relobj_, |
| 3923 | this->r_type_, true, false); |
| 3924 | if (!symbol_references_local(this->sym_, |
| 3925 | this->sym_->should_add_dynsym_entry(symtab))) |
| 3926 | rel_dyn->add_global(this->sym_, this->r_type_, |
| 3927 | this->output_section_, this->relobj_, |
| 3928 | this->shndx_, this->r_offset_); |
| 3929 | else |
| 3930 | rel_dyn->add_symbolless_global_addend(this->sym_, this->r_type_, |
| 3931 | this->output_section_, this->relobj_, |
| 3932 | this->shndx_, this->r_offset_); |
| 3933 | } |
| 3934 | } |
| 3935 | |
| 3936 | private: |
| 3937 | Mips_symbol<size>* sym_; |
| 3938 | unsigned int r_type_; |
| 3939 | Mips_relobj<size, big_endian>* relobj_; |
| 3940 | unsigned int shndx_; |
| 3941 | Output_section* output_section_; |
| 3942 | Mips_address r_offset_; |
| 3943 | }; |
| 3944 | |
| 3945 | // Adjust TLS relocation type based on the options and whether this |
| 3946 | // is a local symbol. |
| 3947 | static tls::Tls_optimization |
| 3948 | optimize_tls_reloc(bool is_final, int r_type); |
| 3949 | |
| 3950 | // Return whether there is a GOT section. |
| 3951 | bool |
| 3952 | has_got_section() const |
| 3953 | { return this->got_ != NULL; } |
| 3954 | |
| 3955 | // Check whether the given ELF header flags describe a 32-bit binary. |
| 3956 | bool |
| 3957 | mips_32bit_flags(elfcpp::Elf_Word); |
| 3958 | |
| 3959 | enum Mips_mach { |
| 3960 | mach_mips3000 = 3000, |
| 3961 | mach_mips3900 = 3900, |
| 3962 | mach_mips4000 = 4000, |
| 3963 | mach_mips4010 = 4010, |
| 3964 | mach_mips4100 = 4100, |
| 3965 | mach_mips4111 = 4111, |
| 3966 | mach_mips4120 = 4120, |
| 3967 | mach_mips4300 = 4300, |
| 3968 | mach_mips4400 = 4400, |
| 3969 | mach_mips4600 = 4600, |
| 3970 | mach_mips4650 = 4650, |
| 3971 | mach_mips5000 = 5000, |
| 3972 | mach_mips5400 = 5400, |
| 3973 | mach_mips5500 = 5500, |
| 3974 | mach_mips5900 = 5900, |
| 3975 | mach_mips6000 = 6000, |
| 3976 | mach_mips7000 = 7000, |
| 3977 | mach_mips8000 = 8000, |
| 3978 | mach_mips9000 = 9000, |
| 3979 | mach_mips10000 = 10000, |
| 3980 | mach_mips12000 = 12000, |
| 3981 | mach_mips14000 = 14000, |
| 3982 | mach_mips16000 = 16000, |
| 3983 | mach_mips16 = 16, |
| 3984 | mach_mips5 = 5, |
| 3985 | mach_mips_loongson_2e = 3001, |
| 3986 | mach_mips_loongson_2f = 3002, |
| 3987 | mach_mips_loongson_3a = 3003, |
| 3988 | mach_mips_sb1 = 12310201, // octal 'SB', 01 |
| 3989 | mach_mips_octeon = 6501, |
| 3990 | mach_mips_octeonp = 6601, |
| 3991 | mach_mips_octeon2 = 6502, |
| 3992 | mach_mips_octeon3 = 6503, |
| 3993 | mach_mips_xlr = 887682, // decimal 'XLR' |
| 3994 | mach_mipsisa32 = 32, |
| 3995 | mach_mipsisa32r2 = 33, |
| 3996 | mach_mipsisa32r3 = 34, |
| 3997 | mach_mipsisa32r5 = 36, |
| 3998 | mach_mipsisa32r6 = 37, |
| 3999 | mach_mipsisa64 = 64, |
| 4000 | mach_mipsisa64r2 = 65, |
| 4001 | mach_mipsisa64r3 = 66, |
| 4002 | mach_mipsisa64r5 = 68, |
| 4003 | mach_mipsisa64r6 = 69, |
| 4004 | mach_mips_micromips = 96 |
| 4005 | }; |
| 4006 | |
| 4007 | // Return the MACH for a MIPS e_flags value. |
| 4008 | unsigned int |
| 4009 | elf_mips_mach(elfcpp::Elf_Word); |
| 4010 | |
| 4011 | // Return the MACH for each .MIPS.abiflags ISA Extension. |
| 4012 | unsigned int |
| 4013 | mips_isa_ext_mach(unsigned int); |
| 4014 | |
| 4015 | // Return the .MIPS.abiflags value representing each ISA Extension. |
| 4016 | unsigned int |
| 4017 | mips_isa_ext(unsigned int); |
| 4018 | |
| 4019 | // Update the isa_level, isa_rev, isa_ext fields of abiflags. |
| 4020 | void |
| 4021 | update_abiflags_isa(const std::string&, elfcpp::Elf_Word, |
| 4022 | Mips_abiflags<big_endian>*); |
| 4023 | |
| 4024 | // Infer the content of the ABI flags based on the elf header. |
| 4025 | void |
| 4026 | infer_abiflags(Mips_relobj<size, big_endian>*, Mips_abiflags<big_endian>*); |
| 4027 | |
| 4028 | // Create abiflags from elf header or from .MIPS.abiflags section. |
| 4029 | void |
| 4030 | create_abiflags(Mips_relobj<size, big_endian>*, Mips_abiflags<big_endian>*); |
| 4031 | |
| 4032 | // Return the meaning of fp_abi, or "unknown" if not known. |
| 4033 | const char* |
| 4034 | fp_abi_string(int); |
| 4035 | |
| 4036 | // Select fp_abi. |
| 4037 | int |
| 4038 | select_fp_abi(const std::string&, int, int); |
| 4039 | |
| 4040 | // Merge attributes from input object. |
| 4041 | void |
| 4042 | merge_obj_attributes(const std::string&, const Attributes_section_data*); |
| 4043 | |
| 4044 | // Merge abiflags from input object. |
| 4045 | void |
| 4046 | merge_obj_abiflags(const std::string&, Mips_abiflags<big_endian>*); |
| 4047 | |
| 4048 | // Check whether machine EXTENSION is an extension of machine BASE. |
| 4049 | bool |
| 4050 | mips_mach_extends(unsigned int, unsigned int); |
| 4051 | |
| 4052 | // Merge file header flags from input object. |
| 4053 | void |
| 4054 | merge_obj_e_flags(const std::string&, elfcpp::Elf_Word); |
| 4055 | |
| 4056 | // Encode ISA level and revision as a single value. |
| 4057 | int |
| 4058 | level_rev(unsigned char isa_level, unsigned char isa_rev) const |
| 4059 | { return (isa_level << 3) | isa_rev; } |
| 4060 | |
| 4061 | // True if we are linking for CPUs that are faster if JAL is converted to BAL. |
| 4062 | static inline bool |
| 4063 | jal_to_bal() |
| 4064 | { return false; } |
| 4065 | |
| 4066 | // True if we are linking for CPUs that are faster if JALR is converted to |
| 4067 | // BAL. This should be safe for all architectures. We enable this predicate |
| 4068 | // for all CPUs. |
| 4069 | static inline bool |
| 4070 | jalr_to_bal() |
| 4071 | { return true; } |
| 4072 | |
| 4073 | // True if we are linking for CPUs that are faster if JR is converted to B. |
| 4074 | // This should be safe for all architectures. We enable this predicate for |
| 4075 | // all CPUs. |
| 4076 | static inline bool |
| 4077 | jr_to_b() |
| 4078 | { return true; } |
| 4079 | |
| 4080 | // Return the size of the GOT section. |
| 4081 | section_size_type |
| 4082 | got_size() const |
| 4083 | { |
| 4084 | gold_assert(this->got_ != NULL); |
| 4085 | return this->got_->data_size(); |
| 4086 | } |
| 4087 | |
| 4088 | // Create a PLT entry for a global symbol referenced by r_type relocation. |
| 4089 | void |
| 4090 | make_plt_entry(Symbol_table*, Layout*, Mips_symbol<size>*, |
| 4091 | unsigned int r_type); |
| 4092 | |
| 4093 | // Get the PLT section. |
| 4094 | Mips_output_data_plt<size, big_endian>* |
| 4095 | plt_section() const |
| 4096 | { |
| 4097 | gold_assert(this->plt_ != NULL); |
| 4098 | return this->plt_; |
| 4099 | } |
| 4100 | |
| 4101 | // Get the GOT PLT section. |
| 4102 | const Mips_output_data_plt<size, big_endian>* |
| 4103 | got_plt_section() const |
| 4104 | { |
| 4105 | gold_assert(this->got_plt_ != NULL); |
| 4106 | return this->got_plt_; |
| 4107 | } |
| 4108 | |
| 4109 | // Copy a relocation against a global symbol. |
| 4110 | void |
| 4111 | copy_reloc(Symbol_table* symtab, Layout* layout, |
| 4112 | Sized_relobj_file<size, big_endian>* object, |
| 4113 | unsigned int shndx, Output_section* output_section, |
| 4114 | Symbol* sym, unsigned int r_type, Mips_address r_offset) |
| 4115 | { |
| 4116 | this->copy_relocs_.copy_reloc(symtab, layout, |
| 4117 | symtab->get_sized_symbol<size>(sym), |
| 4118 | object, shndx, output_section, |
| 4119 | r_type, r_offset, 0, |
| 4120 | this->rel_dyn_section(layout)); |
| 4121 | } |
| 4122 | |
| 4123 | void |
| 4124 | dynamic_reloc(Mips_symbol<size>* sym, unsigned int r_type, |
| 4125 | Mips_relobj<size, big_endian>* relobj, |
| 4126 | unsigned int shndx, Output_section* output_section, |
| 4127 | Mips_address r_offset) |
| 4128 | { |
| 4129 | this->dyn_relocs_.push_back(Dyn_reloc(sym, r_type, relobj, shndx, |
| 4130 | output_section, r_offset)); |
| 4131 | } |
| 4132 | |
| 4133 | // Calculate value of _gp symbol. |
| 4134 | void |
| 4135 | set_gp(Layout*, Symbol_table*); |
| 4136 | |
| 4137 | const char* |
| 4138 | elf_mips_abi_name(elfcpp::Elf_Word e_flags); |
| 4139 | const char* |
| 4140 | elf_mips_mach_name(elfcpp::Elf_Word e_flags); |
| 4141 | |
| 4142 | // Adds entries that describe how machines relate to one another. The entries |
| 4143 | // are ordered topologically with MIPS I extensions listed last. First |
| 4144 | // element is extension, second element is base. |
| 4145 | void |
| 4146 | add_machine_extensions() |
| 4147 | { |
| 4148 | // MIPS64r2 extensions. |
| 4149 | this->add_extension(mach_mips_octeon3, mach_mips_octeon2); |
| 4150 | this->add_extension(mach_mips_octeon2, mach_mips_octeonp); |
| 4151 | this->add_extension(mach_mips_octeonp, mach_mips_octeon); |
| 4152 | this->add_extension(mach_mips_octeon, mach_mipsisa64r2); |
| 4153 | this->add_extension(mach_mips_loongson_3a, mach_mipsisa64r2); |
| 4154 | |
| 4155 | // MIPS64 extensions. |
| 4156 | this->add_extension(mach_mipsisa64r2, mach_mipsisa64); |
| 4157 | this->add_extension(mach_mips_sb1, mach_mipsisa64); |
| 4158 | this->add_extension(mach_mips_xlr, mach_mipsisa64); |
| 4159 | |
| 4160 | // MIPS V extensions. |
| 4161 | this->add_extension(mach_mipsisa64, mach_mips5); |
| 4162 | |
| 4163 | // R10000 extensions. |
| 4164 | this->add_extension(mach_mips12000, mach_mips10000); |
| 4165 | this->add_extension(mach_mips14000, mach_mips10000); |
| 4166 | this->add_extension(mach_mips16000, mach_mips10000); |
| 4167 | |
| 4168 | // R5000 extensions. Note: the vr5500 ISA is an extension of the core |
| 4169 | // vr5400 ISA, but doesn't include the multimedia stuff. It seems |
| 4170 | // better to allow vr5400 and vr5500 code to be merged anyway, since |
| 4171 | // many libraries will just use the core ISA. Perhaps we could add |
| 4172 | // some sort of ASE flag if this ever proves a problem. |
| 4173 | this->add_extension(mach_mips5500, mach_mips5400); |
| 4174 | this->add_extension(mach_mips5400, mach_mips5000); |
| 4175 | |
| 4176 | // MIPS IV extensions. |
| 4177 | this->add_extension(mach_mips5, mach_mips8000); |
| 4178 | this->add_extension(mach_mips10000, mach_mips8000); |
| 4179 | this->add_extension(mach_mips5000, mach_mips8000); |
| 4180 | this->add_extension(mach_mips7000, mach_mips8000); |
| 4181 | this->add_extension(mach_mips9000, mach_mips8000); |
| 4182 | |
| 4183 | // VR4100 extensions. |
| 4184 | this->add_extension(mach_mips4120, mach_mips4100); |
| 4185 | this->add_extension(mach_mips4111, mach_mips4100); |
| 4186 | |
| 4187 | // MIPS III extensions. |
| 4188 | this->add_extension(mach_mips_loongson_2e, mach_mips4000); |
| 4189 | this->add_extension(mach_mips_loongson_2f, mach_mips4000); |
| 4190 | this->add_extension(mach_mips8000, mach_mips4000); |
| 4191 | this->add_extension(mach_mips4650, mach_mips4000); |
| 4192 | this->add_extension(mach_mips4600, mach_mips4000); |
| 4193 | this->add_extension(mach_mips4400, mach_mips4000); |
| 4194 | this->add_extension(mach_mips4300, mach_mips4000); |
| 4195 | this->add_extension(mach_mips4100, mach_mips4000); |
| 4196 | this->add_extension(mach_mips4010, mach_mips4000); |
| 4197 | this->add_extension(mach_mips5900, mach_mips4000); |
| 4198 | |
| 4199 | // MIPS32 extensions. |
| 4200 | this->add_extension(mach_mipsisa32r2, mach_mipsisa32); |
| 4201 | |
| 4202 | // MIPS II extensions. |
| 4203 | this->add_extension(mach_mips4000, mach_mips6000); |
| 4204 | this->add_extension(mach_mipsisa32, mach_mips6000); |
| 4205 | |
| 4206 | // MIPS I extensions. |
| 4207 | this->add_extension(mach_mips6000, mach_mips3000); |
| 4208 | this->add_extension(mach_mips3900, mach_mips3000); |
| 4209 | } |
| 4210 | |
| 4211 | // Add value to MIPS extenstions. |
| 4212 | void |
| 4213 | add_extension(unsigned int base, unsigned int extension) |
| 4214 | { |
| 4215 | std::pair<unsigned int, unsigned int> ext(base, extension); |
| 4216 | this->mips_mach_extensions_.push_back(ext); |
| 4217 | } |
| 4218 | |
| 4219 | // Return the number of entries in the .dynsym section. |
| 4220 | unsigned int get_dt_mips_symtabno() const |
| 4221 | { |
| 4222 | return ((unsigned int)(this->layout_->dynsym_section()->data_size() |
| 4223 | / elfcpp::Elf_sizes<size>::sym_size)); |
| 4224 | // TODO(sasa): Entry size is MIPS_ELF_SYM_SIZE. |
| 4225 | } |
| 4226 | |
| 4227 | // Information about this specific target which we pass to the |
| 4228 | // general Target structure. |
| 4229 | static const Target::Target_info mips_info; |
| 4230 | // The GOT section. |
| 4231 | Mips_output_data_got<size, big_endian>* got_; |
| 4232 | // gp symbol. It has the value of .got + 0x7FF0. |
| 4233 | Sized_symbol<size>* gp_; |
| 4234 | // The PLT section. |
| 4235 | Mips_output_data_plt<size, big_endian>* plt_; |
| 4236 | // The GOT PLT section. |
| 4237 | Output_data_space* got_plt_; |
| 4238 | // The dynamic reloc section. |
| 4239 | Reloc_section* rel_dyn_; |
| 4240 | // The .rld_map section. |
| 4241 | Output_data_zero_fill* rld_map_; |
| 4242 | // Relocs saved to avoid a COPY reloc. |
| 4243 | Mips_copy_relocs<elfcpp::SHT_REL, size, big_endian> copy_relocs_; |
| 4244 | |
| 4245 | // A list of dyn relocs to be saved. |
| 4246 | std::vector<Dyn_reloc> dyn_relocs_; |
| 4247 | |
| 4248 | // The LA25 stub section. |
| 4249 | Mips_output_data_la25_stub<size, big_endian>* la25_stub_; |
| 4250 | // Architecture extensions. |
| 4251 | std::vector<std::pair<unsigned int, unsigned int> > mips_mach_extensions_; |
| 4252 | // .MIPS.stubs |
| 4253 | Mips_output_data_mips_stubs<size, big_endian>* mips_stubs_; |
| 4254 | |
| 4255 | // Attributes section data in output. |
| 4256 | Attributes_section_data* attributes_section_data_; |
| 4257 | // .MIPS.abiflags section data in output. |
| 4258 | Mips_abiflags<big_endian>* abiflags_; |
| 4259 | |
| 4260 | unsigned int mach_; |
| 4261 | Layout* layout_; |
| 4262 | |
| 4263 | typename std::list<got16_addend<size, big_endian> > got16_addends_; |
| 4264 | |
| 4265 | // Whether there is an input .MIPS.abiflags section. |
| 4266 | bool has_abiflags_section_; |
| 4267 | |
| 4268 | // Whether the entry symbol is mips16 or micromips. |
| 4269 | bool entry_symbol_is_compressed_; |
| 4270 | |
| 4271 | // Whether we can use only 32-bit microMIPS instructions. |
| 4272 | // TODO(sasa): This should be a linker option. |
| 4273 | bool insn32_; |
| 4274 | }; |
| 4275 | |
| 4276 | // Helper structure for R_MIPS*_HI16/LO16 and R_MIPS*_GOT16/LO16 relocations. |
| 4277 | // It records high part of the relocation pair. |
| 4278 | |
| 4279 | template<int size, bool big_endian> |
| 4280 | struct reloc_high |
| 4281 | { |
| 4282 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 4283 | |
| 4284 | reloc_high(unsigned char* _view, const Mips_relobj<size, big_endian>* _object, |
| 4285 | const Symbol_value<size>* _psymval, Mips_address _addend, |
| 4286 | unsigned int _r_type, unsigned int _r_sym, bool _extract_addend, |
| 4287 | Mips_address _address = 0, bool _gp_disp = false) |
| 4288 | : view(_view), object(_object), psymval(_psymval), addend(_addend), |
| 4289 | r_type(_r_type), r_sym(_r_sym), extract_addend(_extract_addend), |
| 4290 | address(_address), gp_disp(_gp_disp) |
| 4291 | { } |
| 4292 | |
| 4293 | unsigned char* view; |
| 4294 | const Mips_relobj<size, big_endian>* object; |
| 4295 | const Symbol_value<size>* psymval; |
| 4296 | Mips_address addend; |
| 4297 | unsigned int r_type; |
| 4298 | unsigned int r_sym; |
| 4299 | bool extract_addend; |
| 4300 | Mips_address address; |
| 4301 | bool gp_disp; |
| 4302 | }; |
| 4303 | |
| 4304 | template<int size, bool big_endian> |
| 4305 | class Mips_relocate_functions : public Relocate_functions<size, big_endian> |
| 4306 | { |
| 4307 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Mips_address; |
| 4308 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| 4309 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype16; |
| 4310 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype32; |
| 4311 | typedef typename elfcpp::Swap<64, big_endian>::Valtype Valtype64; |
| 4312 | |
| 4313 | public: |
| 4314 | typedef enum |
| 4315 | { |
| 4316 | STATUS_OKAY, // No error during relocation. |
| 4317 | STATUS_OVERFLOW, // Relocation overflow. |
| 4318 | STATUS_BAD_RELOC, // Relocation cannot be applied. |
| 4319 | STATUS_PCREL_UNALIGNED // Unaligned PC-relative relocation. |
| 4320 | } Status; |
| 4321 | |
| 4322 | private: |
| 4323 | typedef Relocate_functions<size, big_endian> Base; |
| 4324 | typedef Mips_relocate_functions<size, big_endian> This; |
| 4325 | |
| 4326 | static typename std::list<reloc_high<size, big_endian> > hi16_relocs; |
| 4327 | static typename std::list<reloc_high<size, big_endian> > got16_relocs; |
| 4328 | static typename std::list<reloc_high<size, big_endian> > pchi16_relocs; |
| 4329 | |
| 4330 | template<int valsize> |
| 4331 | static inline typename This::Status |
| 4332 | check_overflow(Valtype value) |
| 4333 | { |
| 4334 | if (size == 32) |
| 4335 | return (Bits<valsize>::has_overflow32(value) |
| 4336 | ? This::STATUS_OVERFLOW |
| 4337 | : This::STATUS_OKAY); |
| 4338 | |
| 4339 | return (Bits<valsize>::has_overflow(value) |
| 4340 | ? This::STATUS_OVERFLOW |
| 4341 | : This::STATUS_OKAY); |
| 4342 | } |
| 4343 | |
| 4344 | static inline bool |
| 4345 | should_shuffle_micromips_reloc(unsigned int r_type) |
| 4346 | { |
| 4347 | return (micromips_reloc(r_type) |
| 4348 | && r_type != elfcpp::R_MICROMIPS_PC7_S1 |
| 4349 | && r_type != elfcpp::R_MICROMIPS_PC10_S1); |
| 4350 | } |
| 4351 | |
| 4352 | public: |
| 4353 | // R_MIPS16_26 is used for the mips16 jal and jalx instructions. |
| 4354 | // Most mips16 instructions are 16 bits, but these instructions |
| 4355 | // are 32 bits. |
| 4356 | // |
| 4357 | // The format of these instructions is: |
| 4358 | // |
| 4359 | // +--------------+--------------------------------+ |
| 4360 | // | JALX | X| Imm 20:16 | Imm 25:21 | |
| 4361 | // +--------------+--------------------------------+ |
| 4362 | // | Immediate 15:0 | |
| 4363 | // +-----------------------------------------------+ |
| 4364 | // |
| 4365 | // JALX is the 5-bit value 00011. X is 0 for jal, 1 for jalx. |
| 4366 | // Note that the immediate value in the first word is swapped. |
| 4367 | // |
| 4368 | // When producing a relocatable object file, R_MIPS16_26 is |
| 4369 | // handled mostly like R_MIPS_26. In particular, the addend is |
| 4370 | // stored as a straight 26-bit value in a 32-bit instruction. |
| 4371 | // (gas makes life simpler for itself by never adjusting a |
| 4372 | // R_MIPS16_26 reloc to be against a section, so the addend is |
| 4373 | // always zero). However, the 32 bit instruction is stored as 2 |
| 4374 | // 16-bit values, rather than a single 32-bit value. In a |
| 4375 | // big-endian file, the result is the same; in a little-endian |
| 4376 | // file, the two 16-bit halves of the 32 bit value are swapped. |
| 4377 | // This is so that a disassembler can recognize the jal |
| 4378 | // instruction. |
| 4379 | // |
| 4380 | // When doing a final link, R_MIPS16_26 is treated as a 32 bit |
| 4381 | // instruction stored as two 16-bit values. The addend A is the |
| 4382 | // contents of the targ26 field. The calculation is the same as |
| 4383 | // R_MIPS_26. When storing the calculated value, reorder the |
| 4384 | // immediate value as shown above, and don't forget to store the |
| 4385 | // value as two 16-bit values. |
| 4386 | // |
| 4387 | // To put it in MIPS ABI terms, the relocation field is T-targ26-16, |
| 4388 | // defined as |
| 4389 | // |
| 4390 | // big-endian: |
| 4391 | // +--------+----------------------+ |
| 4392 | // | | | |
| 4393 | // | | targ26-16 | |
| 4394 | // |31 26|25 0| |
| 4395 | // +--------+----------------------+ |
| 4396 | // |
| 4397 | // little-endian: |
| 4398 | // +----------+------+-------------+ |
| 4399 | // | | | | |
| 4400 | // | sub1 | | sub2 | |
| 4401 | // |0 9|10 15|16 31| |
| 4402 | // +----------+--------------------+ |
| 4403 | // where targ26-16 is sub1 followed by sub2 (i.e., the addend field A is |
| 4404 | // ((sub1 << 16) | sub2)). |
| 4405 | // |
| 4406 | // When producing a relocatable object file, the calculation is |
| 4407 | // (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2) |
| 4408 | // When producing a fully linked file, the calculation is |
| 4409 | // let R = (((A < 2) | ((P + 4) & 0xf0000000) + S) >> 2) |
| 4410 | // ((R & 0x1f0000) << 5) | ((R & 0x3e00000) >> 5) | (R & 0xffff) |
| 4411 | // |
| 4412 | // The table below lists the other MIPS16 instruction relocations. |
| 4413 | // Each one is calculated in the same way as the non-MIPS16 relocation |
| 4414 | // given on the right, but using the extended MIPS16 layout of 16-bit |
| 4415 | // immediate fields: |
| 4416 | // |
| 4417 | // R_MIPS16_GPREL R_MIPS_GPREL16 |
| 4418 | // R_MIPS16_GOT16 R_MIPS_GOT16 |
| 4419 | // R_MIPS16_CALL16 R_MIPS_CALL16 |
| 4420 | // R_MIPS16_HI16 R_MIPS_HI16 |
| 4421 | // R_MIPS16_LO16 R_MIPS_LO16 |
| 4422 | // |
| 4423 | // A typical instruction will have a format like this: |
| 4424 | // |
| 4425 | // +--------------+--------------------------------+ |
| 4426 | // | EXTEND | Imm 10:5 | Imm 15:11 | |
| 4427 | // +--------------+--------------------------------+ |
| 4428 | // | Major | rx | ry | Imm 4:0 | |
| 4429 | // +--------------+--------------------------------+ |
| 4430 | // |
| 4431 | // EXTEND is the five bit value 11110. Major is the instruction |
| 4432 | // opcode. |
| 4433 | // |
| 4434 | // All we need to do here is shuffle the bits appropriately. |
| 4435 | // As above, the two 16-bit halves must be swapped on a |
| 4436 | // little-endian system. |
| 4437 | |
| 4438 | // Similar to MIPS16, the two 16-bit halves in microMIPS must be swapped |
| 4439 | // on a little-endian system. This does not apply to R_MICROMIPS_PC7_S1 |
| 4440 | // and R_MICROMIPS_PC10_S1 relocs that apply to 16-bit instructions. |
| 4441 | |
| 4442 | static void |
| 4443 | mips_reloc_unshuffle(unsigned char* view, unsigned int r_type, |
| 4444 | bool jal_shuffle) |
| 4445 | { |
| 4446 | if (!mips16_reloc(r_type) |
| 4447 | && !should_shuffle_micromips_reloc(r_type)) |
| 4448 | return; |
| 4449 | |
| 4450 | // Pick up the first and second halfwords of the instruction. |
| 4451 | Valtype16 first = elfcpp::Swap<16, big_endian>::readval(view); |
| 4452 | Valtype16 second = elfcpp::Swap<16, big_endian>::readval(view + 2); |
| 4453 | Valtype32 val; |
| 4454 | |
| 4455 | if (micromips_reloc(r_type) |
| 4456 | || (r_type == elfcpp::R_MIPS16_26 && !jal_shuffle)) |
| 4457 | val = first << 16 | second; |
| 4458 | else if (r_type != elfcpp::R_MIPS16_26) |
| 4459 | val = (((first & 0xf800) << 16) | ((second & 0xffe0) << 11) |
| 4460 | | ((first & 0x1f) << 11) | (first & 0x7e0) | (second & 0x1f)); |
| 4461 | else |
| 4462 | val = (((first & 0xfc00) << 16) | ((first & 0x3e0) << 11) |
| 4463 | | ((first & 0x1f) << 21) | second); |
| 4464 | |
| 4465 | elfcpp::Swap<32, big_endian>::writeval(view, val); |
| 4466 | } |
| 4467 | |
| 4468 | static void |
| 4469 | mips_reloc_shuffle(unsigned char* view, unsigned int r_type, bool jal_shuffle) |
| 4470 | { |
| 4471 | if (!mips16_reloc(r_type) |
| 4472 | && !should_shuffle_micromips_reloc(r_type)) |
| 4473 | return; |
| 4474 | |
| 4475 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); |
| 4476 | Valtype16 first, second; |
| 4477 | |
| 4478 | if (micromips_reloc(r_type) |
| 4479 | || (r_type == elfcpp::R_MIPS16_26 && !jal_shuffle)) |
| 4480 | { |
| 4481 | second = val & 0xffff; |
| 4482 | first = val >> 16; |
| 4483 | } |
| 4484 | else if (r_type != elfcpp::R_MIPS16_26) |
| 4485 | { |
| 4486 | second = ((val >> 11) & 0xffe0) | (val & 0x1f); |
| 4487 | first = ((val >> 16) & 0xf800) | ((val >> 11) & 0x1f) | (val & 0x7e0); |
| 4488 | } |
| 4489 | else |
| 4490 | { |
| 4491 | second = val & 0xffff; |
| 4492 | first = ((val >> 16) & 0xfc00) | ((val >> 11) & 0x3e0) |
| 4493 | | ((val >> 21) & 0x1f); |
| 4494 | } |
| 4495 | |
| 4496 | elfcpp::Swap<16, big_endian>::writeval(view + 2, second); |
| 4497 | elfcpp::Swap<16, big_endian>::writeval(view, first); |
| 4498 | } |
| 4499 | |
| 4500 | // R_MIPS_16: S + sign-extend(A) |
| 4501 | static inline typename This::Status |
| 4502 | rel16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4503 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 4504 | bool extract_addend, bool calculate_only, Valtype* calculated_value) |
| 4505 | { |
| 4506 | Valtype16* wv = reinterpret_cast<Valtype16*>(view); |
| 4507 | Valtype16 val = elfcpp::Swap<16, big_endian>::readval(wv); |
| 4508 | |
| 4509 | Valtype addend = (extract_addend ? Bits<16>::sign_extend32(val) |
| 4510 | : addend_a); |
| 4511 | |
| 4512 | Valtype x = psymval->value(object, addend); |
| 4513 | val = Bits<16>::bit_select32(val, x, 0xffffU); |
| 4514 | |
| 4515 | if (calculate_only) |
| 4516 | { |
| 4517 | *calculated_value = x; |
| 4518 | return This::STATUS_OKAY; |
| 4519 | } |
| 4520 | else |
| 4521 | elfcpp::Swap<16, big_endian>::writeval(wv, val); |
| 4522 | |
| 4523 | return check_overflow<16>(x); |
| 4524 | } |
| 4525 | |
| 4526 | // R_MIPS_32: S + A |
| 4527 | static inline typename This::Status |
| 4528 | rel32(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4529 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 4530 | bool extract_addend, bool calculate_only, Valtype* calculated_value) |
| 4531 | { |
| 4532 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4533 | Valtype addend = (extract_addend |
| 4534 | ? elfcpp::Swap<32, big_endian>::readval(wv) |
| 4535 | : addend_a); |
| 4536 | Valtype x = psymval->value(object, addend); |
| 4537 | |
| 4538 | if (calculate_only) |
| 4539 | *calculated_value = x; |
| 4540 | else |
| 4541 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
| 4542 | |
| 4543 | return This::STATUS_OKAY; |
| 4544 | } |
| 4545 | |
| 4546 | // R_MIPS_JALR, R_MICROMIPS_JALR |
| 4547 | static inline typename This::Status |
| 4548 | reljalr(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4549 | const Symbol_value<size>* psymval, Mips_address address, |
| 4550 | Mips_address addend_a, bool extract_addend, bool cross_mode_jump, |
| 4551 | unsigned int r_type, bool jalr_to_bal, bool jr_to_b, |
| 4552 | bool calculate_only, Valtype* calculated_value) |
| 4553 | { |
| 4554 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4555 | Valtype addend = extract_addend ? 0 : addend_a; |
| 4556 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4557 | |
| 4558 | // Try converting J(AL)R to B(AL), if the target is in range. |
| 4559 | if (r_type == elfcpp::R_MIPS_JALR |
| 4560 | && !cross_mode_jump |
| 4561 | && ((jalr_to_bal && val == 0x0320f809) // jalr t9 |
| 4562 | || (jr_to_b && val == 0x03200008))) // jr t9 |
| 4563 | { |
| 4564 | int offset = psymval->value(object, addend) - (address + 4); |
| 4565 | if (!Bits<18>::has_overflow32(offset)) |
| 4566 | { |
| 4567 | if (val == 0x03200008) // jr t9 |
| 4568 | val = 0x10000000 | (((Valtype32)offset >> 2) & 0xffff); // b addr |
| 4569 | else |
| 4570 | val = 0x04110000 | (((Valtype32)offset >> 2) & 0xffff); //bal addr |
| 4571 | } |
| 4572 | } |
| 4573 | |
| 4574 | if (calculate_only) |
| 4575 | *calculated_value = val; |
| 4576 | else |
| 4577 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4578 | |
| 4579 | return This::STATUS_OKAY; |
| 4580 | } |
| 4581 | |
| 4582 | // R_MIPS_PC32: S + A - P |
| 4583 | static inline typename This::Status |
| 4584 | relpc32(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4585 | const Symbol_value<size>* psymval, Mips_address address, |
| 4586 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 4587 | Valtype* calculated_value) |
| 4588 | { |
| 4589 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4590 | Valtype addend = (extract_addend |
| 4591 | ? elfcpp::Swap<32, big_endian>::readval(wv) |
| 4592 | : addend_a); |
| 4593 | Valtype x = psymval->value(object, addend) - address; |
| 4594 | |
| 4595 | if (calculate_only) |
| 4596 | *calculated_value = x; |
| 4597 | else |
| 4598 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
| 4599 | |
| 4600 | return This::STATUS_OKAY; |
| 4601 | } |
| 4602 | |
| 4603 | // R_MIPS_26, R_MIPS16_26, R_MICROMIPS_26_S1 |
| 4604 | static inline typename This::Status |
| 4605 | rel26(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4606 | const Symbol_value<size>* psymval, Mips_address address, |
| 4607 | bool local, Mips_address addend_a, bool extract_addend, |
| 4608 | const Symbol* gsym, bool cross_mode_jump, unsigned int r_type, |
| 4609 | bool jal_to_bal, bool calculate_only, Valtype* calculated_value) |
| 4610 | { |
| 4611 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4612 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4613 | |
| 4614 | Valtype addend; |
| 4615 | if (extract_addend) |
| 4616 | { |
| 4617 | if (r_type == elfcpp::R_MICROMIPS_26_S1) |
| 4618 | addend = (val & 0x03ffffff) << 1; |
| 4619 | else |
| 4620 | addend = (val & 0x03ffffff) << 2; |
| 4621 | } |
| 4622 | else |
| 4623 | addend = addend_a; |
| 4624 | |
| 4625 | // Make sure the target of JALX is word-aligned. Bit 0 must be |
| 4626 | // the correct ISA mode selector and bit 1 must be 0. |
| 4627 | if (!calculate_only && cross_mode_jump |
| 4628 | && (psymval->value(object, 0) & 3) != (r_type == elfcpp::R_MIPS_26)) |
| 4629 | { |
| 4630 | gold_warning(_("JALX to a non-word-aligned address")); |
| 4631 | return This::STATUS_BAD_RELOC; |
| 4632 | } |
| 4633 | |
| 4634 | // Shift is 2, unusually, for microMIPS JALX. |
| 4635 | unsigned int shift = |
| 4636 | (!cross_mode_jump && r_type == elfcpp::R_MICROMIPS_26_S1) ? 1 : 2; |
| 4637 | |
| 4638 | Valtype x; |
| 4639 | if (local) |
| 4640 | x = addend | ((address + 4) & (0xfc000000 << shift)); |
| 4641 | else |
| 4642 | { |
| 4643 | if (shift == 1) |
| 4644 | x = Bits<27>::sign_extend32(addend); |
| 4645 | else |
| 4646 | x = Bits<28>::sign_extend32(addend); |
| 4647 | } |
| 4648 | x = psymval->value(object, x) >> shift; |
| 4649 | |
| 4650 | if (!calculate_only && !local && !gsym->is_weak_undefined() |
| 4651 | && ((x >> 26) != ((address + 4) >> (26 + shift)))) |
| 4652 | return This::STATUS_OVERFLOW; |
| 4653 | |
| 4654 | val = Bits<32>::bit_select32(val, x, 0x03ffffff); |
| 4655 | |
| 4656 | // If required, turn JAL into JALX. |
| 4657 | if (cross_mode_jump) |
| 4658 | { |
| 4659 | bool ok; |
| 4660 | Valtype32 opcode = val >> 26; |
| 4661 | Valtype32 jalx_opcode; |
| 4662 | |
| 4663 | // Check to see if the opcode is already JAL or JALX. |
| 4664 | if (r_type == elfcpp::R_MIPS16_26) |
| 4665 | { |
| 4666 | ok = (opcode == 0x6) || (opcode == 0x7); |
| 4667 | jalx_opcode = 0x7; |
| 4668 | } |
| 4669 | else if (r_type == elfcpp::R_MICROMIPS_26_S1) |
| 4670 | { |
| 4671 | ok = (opcode == 0x3d) || (opcode == 0x3c); |
| 4672 | jalx_opcode = 0x3c; |
| 4673 | } |
| 4674 | else |
| 4675 | { |
| 4676 | ok = (opcode == 0x3) || (opcode == 0x1d); |
| 4677 | jalx_opcode = 0x1d; |
| 4678 | } |
| 4679 | |
| 4680 | // If the opcode is not JAL or JALX, there's a problem. We cannot |
| 4681 | // convert J or JALS to JALX. |
| 4682 | if (!calculate_only && !ok) |
| 4683 | { |
| 4684 | gold_error(_("Unsupported jump between ISA modes; consider " |
| 4685 | "recompiling with interlinking enabled.")); |
| 4686 | return This::STATUS_BAD_RELOC; |
| 4687 | } |
| 4688 | |
| 4689 | // Make this the JALX opcode. |
| 4690 | val = (val & ~(0x3f << 26)) | (jalx_opcode << 26); |
| 4691 | } |
| 4692 | |
| 4693 | // Try converting JAL to BAL, if the target is in range. |
| 4694 | if (!parameters->options().relocatable() |
| 4695 | && !cross_mode_jump |
| 4696 | && ((jal_to_bal |
| 4697 | && r_type == elfcpp::R_MIPS_26 |
| 4698 | && (val >> 26) == 0x3))) // jal addr |
| 4699 | { |
| 4700 | Valtype32 dest = (x << 2) | (((address + 4) >> 28) << 28); |
| 4701 | int offset = dest - (address + 4); |
| 4702 | if (!Bits<18>::has_overflow32(offset)) |
| 4703 | { |
| 4704 | if (val == 0x03200008) // jr t9 |
| 4705 | val = 0x10000000 | (((Valtype32)offset >> 2) & 0xffff); // b addr |
| 4706 | else |
| 4707 | val = 0x04110000 | (((Valtype32)offset >> 2) & 0xffff); //bal addr |
| 4708 | } |
| 4709 | } |
| 4710 | |
| 4711 | if (calculate_only) |
| 4712 | *calculated_value = val; |
| 4713 | else |
| 4714 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4715 | |
| 4716 | return This::STATUS_OKAY; |
| 4717 | } |
| 4718 | |
| 4719 | // R_MIPS_PC16 |
| 4720 | static inline typename This::Status |
| 4721 | relpc16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4722 | const Symbol_value<size>* psymval, Mips_address address, |
| 4723 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 4724 | Valtype* calculated_value) |
| 4725 | { |
| 4726 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4727 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4728 | |
| 4729 | Valtype addend = (extract_addend |
| 4730 | ? Bits<18>::sign_extend32((val & 0xffff) << 2) |
| 4731 | : addend_a); |
| 4732 | |
| 4733 | Valtype x = psymval->value(object, addend) - address; |
| 4734 | val = Bits<16>::bit_select32(val, x >> 2, 0xffff); |
| 4735 | |
| 4736 | if (calculate_only) |
| 4737 | { |
| 4738 | *calculated_value = x >> 2; |
| 4739 | return This::STATUS_OKAY; |
| 4740 | } |
| 4741 | else |
| 4742 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4743 | |
| 4744 | if (psymval->value(object, addend) & 3) |
| 4745 | return This::STATUS_PCREL_UNALIGNED; |
| 4746 | |
| 4747 | return check_overflow<18>(x); |
| 4748 | } |
| 4749 | |
| 4750 | // R_MIPS_PC21_S2 |
| 4751 | static inline typename This::Status |
| 4752 | relpc21(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4753 | const Symbol_value<size>* psymval, Mips_address address, |
| 4754 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 4755 | Valtype* calculated_value) |
| 4756 | { |
| 4757 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4758 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4759 | |
| 4760 | Valtype addend = (extract_addend |
| 4761 | ? Bits<23>::sign_extend32((val & 0x1fffff) << 2) |
| 4762 | : addend_a); |
| 4763 | |
| 4764 | Valtype x = psymval->value(object, addend) - address; |
| 4765 | val = Bits<21>::bit_select32(val, x >> 2, 0x1fffff); |
| 4766 | |
| 4767 | if (calculate_only) |
| 4768 | { |
| 4769 | *calculated_value = x >> 2; |
| 4770 | return This::STATUS_OKAY; |
| 4771 | } |
| 4772 | else |
| 4773 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4774 | |
| 4775 | if (psymval->value(object, addend) & 3) |
| 4776 | return This::STATUS_PCREL_UNALIGNED; |
| 4777 | |
| 4778 | return check_overflow<23>(x); |
| 4779 | } |
| 4780 | |
| 4781 | // R_MIPS_PC26_S2 |
| 4782 | static inline typename This::Status |
| 4783 | relpc26(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4784 | const Symbol_value<size>* psymval, Mips_address address, |
| 4785 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 4786 | Valtype* calculated_value) |
| 4787 | { |
| 4788 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4789 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4790 | |
| 4791 | Valtype addend = (extract_addend |
| 4792 | ? Bits<28>::sign_extend32((val & 0x3ffffff) << 2) |
| 4793 | : addend_a); |
| 4794 | |
| 4795 | Valtype x = psymval->value(object, addend) - address; |
| 4796 | val = Bits<26>::bit_select32(val, x >> 2, 0x3ffffff); |
| 4797 | |
| 4798 | if (calculate_only) |
| 4799 | { |
| 4800 | *calculated_value = x >> 2; |
| 4801 | return This::STATUS_OKAY; |
| 4802 | } |
| 4803 | else |
| 4804 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4805 | |
| 4806 | if (psymval->value(object, addend) & 3) |
| 4807 | return This::STATUS_PCREL_UNALIGNED; |
| 4808 | |
| 4809 | return check_overflow<28>(x); |
| 4810 | } |
| 4811 | |
| 4812 | // R_MIPS_PC18_S3 |
| 4813 | static inline typename This::Status |
| 4814 | relpc18(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4815 | const Symbol_value<size>* psymval, Mips_address address, |
| 4816 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 4817 | Valtype* calculated_value) |
| 4818 | { |
| 4819 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4820 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4821 | |
| 4822 | Valtype addend = (extract_addend |
| 4823 | ? Bits<21>::sign_extend32((val & 0x3ffff) << 3) |
| 4824 | : addend_a); |
| 4825 | |
| 4826 | Valtype x = psymval->value(object, addend) - ((address | 7) ^ 7); |
| 4827 | val = Bits<18>::bit_select32(val, x >> 3, 0x3ffff); |
| 4828 | |
| 4829 | if (calculate_only) |
| 4830 | { |
| 4831 | *calculated_value = x >> 3; |
| 4832 | return This::STATUS_OKAY; |
| 4833 | } |
| 4834 | else |
| 4835 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4836 | |
| 4837 | if (psymval->value(object, addend) & 7) |
| 4838 | return This::STATUS_PCREL_UNALIGNED; |
| 4839 | |
| 4840 | return check_overflow<21>(x); |
| 4841 | } |
| 4842 | |
| 4843 | // R_MIPS_PC19_S2 |
| 4844 | static inline typename This::Status |
| 4845 | relpc19(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4846 | const Symbol_value<size>* psymval, Mips_address address, |
| 4847 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 4848 | Valtype* calculated_value) |
| 4849 | { |
| 4850 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4851 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4852 | |
| 4853 | Valtype addend = (extract_addend |
| 4854 | ? Bits<21>::sign_extend32((val & 0x7ffff) << 2) |
| 4855 | : addend_a); |
| 4856 | |
| 4857 | Valtype x = psymval->value(object, addend) - address; |
| 4858 | val = Bits<19>::bit_select32(val, x >> 2, 0x7ffff); |
| 4859 | |
| 4860 | if (calculate_only) |
| 4861 | { |
| 4862 | *calculated_value = x >> 2; |
| 4863 | return This::STATUS_OKAY; |
| 4864 | } |
| 4865 | else |
| 4866 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4867 | |
| 4868 | if (psymval->value(object, addend) & 3) |
| 4869 | return This::STATUS_PCREL_UNALIGNED; |
| 4870 | |
| 4871 | return check_overflow<21>(x); |
| 4872 | } |
| 4873 | |
| 4874 | // R_MIPS_PCHI16 |
| 4875 | static inline typename This::Status |
| 4876 | relpchi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4877 | const Symbol_value<size>* psymval, Mips_address addend, |
| 4878 | Mips_address address, unsigned int r_sym, bool extract_addend) |
| 4879 | { |
| 4880 | // Record the relocation. It will be resolved when we find pclo16 part. |
| 4881 | pchi16_relocs.push_back(reloc_high<size, big_endian>(view, object, psymval, |
| 4882 | addend, 0, r_sym, extract_addend, address)); |
| 4883 | return This::STATUS_OKAY; |
| 4884 | } |
| 4885 | |
| 4886 | // R_MIPS_PCHI16 |
| 4887 | static inline typename This::Status |
| 4888 | do_relpchi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4889 | const Symbol_value<size>* psymval, Mips_address addend_hi, |
| 4890 | Mips_address address, bool extract_addend, Valtype32 addend_lo, |
| 4891 | bool calculate_only, Valtype* calculated_value) |
| 4892 | { |
| 4893 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4894 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4895 | |
| 4896 | Valtype addend = (extract_addend ? ((val & 0xffff) << 16) + addend_lo |
| 4897 | : addend_hi); |
| 4898 | |
| 4899 | Valtype value = psymval->value(object, addend) - address; |
| 4900 | Valtype x = ((value + 0x8000) >> 16) & 0xffff; |
| 4901 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 4902 | |
| 4903 | if (calculate_only) |
| 4904 | *calculated_value = x; |
| 4905 | else |
| 4906 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4907 | |
| 4908 | return This::STATUS_OKAY; |
| 4909 | } |
| 4910 | |
| 4911 | // R_MIPS_PCLO16 |
| 4912 | static inline typename This::Status |
| 4913 | relpclo16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 4914 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 4915 | bool extract_addend, Mips_address address, unsigned int r_sym, |
| 4916 | unsigned int rel_type, bool calculate_only, |
| 4917 | Valtype* calculated_value) |
| 4918 | { |
| 4919 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4920 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4921 | |
| 4922 | Valtype addend = (extract_addend ? Bits<16>::sign_extend32(val & 0xffff) |
| 4923 | : addend_a); |
| 4924 | |
| 4925 | if (rel_type == elfcpp::SHT_REL) |
| 4926 | { |
| 4927 | // Resolve pending R_MIPS_PCHI16 relocations. |
| 4928 | typename std::list<reloc_high<size, big_endian> >::iterator it = |
| 4929 | pchi16_relocs.begin(); |
| 4930 | while (it != pchi16_relocs.end()) |
| 4931 | { |
| 4932 | reloc_high<size, big_endian> pchi16 = *it; |
| 4933 | if (pchi16.r_sym == r_sym) |
| 4934 | { |
| 4935 | do_relpchi16(pchi16.view, pchi16.object, pchi16.psymval, |
| 4936 | pchi16.addend, pchi16.address, |
| 4937 | pchi16.extract_addend, addend, calculate_only, |
| 4938 | calculated_value); |
| 4939 | it = pchi16_relocs.erase(it); |
| 4940 | } |
| 4941 | else |
| 4942 | ++it; |
| 4943 | } |
| 4944 | } |
| 4945 | |
| 4946 | // Resolve R_MIPS_PCLO16 relocation. |
| 4947 | Valtype x = psymval->value(object, addend) - address; |
| 4948 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 4949 | |
| 4950 | if (calculate_only) |
| 4951 | *calculated_value = x; |
| 4952 | else |
| 4953 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4954 | |
| 4955 | return This::STATUS_OKAY; |
| 4956 | } |
| 4957 | |
| 4958 | // R_MICROMIPS_PC7_S1 |
| 4959 | static inline typename This::Status |
| 4960 | relmicromips_pc7_s1(unsigned char* view, |
| 4961 | const Mips_relobj<size, big_endian>* object, |
| 4962 | const Symbol_value<size>* psymval, Mips_address address, |
| 4963 | Mips_address addend_a, bool extract_addend, |
| 4964 | bool calculate_only, Valtype* calculated_value) |
| 4965 | { |
| 4966 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4967 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4968 | |
| 4969 | Valtype addend = extract_addend ? Bits<8>::sign_extend32((val & 0x7f) << 1) |
| 4970 | : addend_a; |
| 4971 | |
| 4972 | Valtype x = psymval->value(object, addend) - address; |
| 4973 | val = Bits<16>::bit_select32(val, x >> 1, 0x7f); |
| 4974 | |
| 4975 | if (calculate_only) |
| 4976 | { |
| 4977 | *calculated_value = x >> 1; |
| 4978 | return This::STATUS_OKAY; |
| 4979 | } |
| 4980 | else |
| 4981 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 4982 | |
| 4983 | return check_overflow<8>(x); |
| 4984 | } |
| 4985 | |
| 4986 | // R_MICROMIPS_PC10_S1 |
| 4987 | static inline typename This::Status |
| 4988 | relmicromips_pc10_s1(unsigned char* view, |
| 4989 | const Mips_relobj<size, big_endian>* object, |
| 4990 | const Symbol_value<size>* psymval, Mips_address address, |
| 4991 | Mips_address addend_a, bool extract_addend, |
| 4992 | bool calculate_only, Valtype* calculated_value) |
| 4993 | { |
| 4994 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 4995 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 4996 | |
| 4997 | Valtype addend = (extract_addend |
| 4998 | ? Bits<11>::sign_extend32((val & 0x3ff) << 1) |
| 4999 | : addend_a); |
| 5000 | |
| 5001 | Valtype x = psymval->value(object, addend) - address; |
| 5002 | val = Bits<16>::bit_select32(val, x >> 1, 0x3ff); |
| 5003 | |
| 5004 | if (calculate_only) |
| 5005 | { |
| 5006 | *calculated_value = x >> 1; |
| 5007 | return This::STATUS_OKAY; |
| 5008 | } |
| 5009 | else |
| 5010 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5011 | |
| 5012 | return check_overflow<11>(x); |
| 5013 | } |
| 5014 | |
| 5015 | // R_MICROMIPS_PC16_S1 |
| 5016 | static inline typename This::Status |
| 5017 | relmicromips_pc16_s1(unsigned char* view, |
| 5018 | const Mips_relobj<size, big_endian>* object, |
| 5019 | const Symbol_value<size>* psymval, Mips_address address, |
| 5020 | Mips_address addend_a, bool extract_addend, |
| 5021 | bool calculate_only, Valtype* calculated_value) |
| 5022 | { |
| 5023 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5024 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5025 | |
| 5026 | Valtype addend = (extract_addend |
| 5027 | ? Bits<17>::sign_extend32((val & 0xffff) << 1) |
| 5028 | : addend_a); |
| 5029 | |
| 5030 | Valtype x = psymval->value(object, addend) - address; |
| 5031 | val = Bits<16>::bit_select32(val, x >> 1, 0xffff); |
| 5032 | |
| 5033 | if (calculate_only) |
| 5034 | { |
| 5035 | *calculated_value = x >> 1; |
| 5036 | return This::STATUS_OKAY; |
| 5037 | } |
| 5038 | else |
| 5039 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5040 | |
| 5041 | return check_overflow<17>(x); |
| 5042 | } |
| 5043 | |
| 5044 | // R_MIPS_HI16, R_MIPS16_HI16, R_MICROMIPS_HI16, |
| 5045 | static inline typename This::Status |
| 5046 | relhi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5047 | const Symbol_value<size>* psymval, Mips_address addend, |
| 5048 | Mips_address address, bool gp_disp, unsigned int r_type, |
| 5049 | unsigned int r_sym, bool extract_addend) |
| 5050 | { |
| 5051 | // Record the relocation. It will be resolved when we find lo16 part. |
| 5052 | hi16_relocs.push_back(reloc_high<size, big_endian>(view, object, psymval, |
| 5053 | addend, r_type, r_sym, extract_addend, address, |
| 5054 | gp_disp)); |
| 5055 | return This::STATUS_OKAY; |
| 5056 | } |
| 5057 | |
| 5058 | // R_MIPS_HI16, R_MIPS16_HI16, R_MICROMIPS_HI16, |
| 5059 | static inline typename This::Status |
| 5060 | do_relhi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5061 | const Symbol_value<size>* psymval, Mips_address addend_hi, |
| 5062 | Mips_address address, bool is_gp_disp, unsigned int r_type, |
| 5063 | bool extract_addend, Valtype32 addend_lo, |
| 5064 | Target_mips<size, big_endian>* target, bool calculate_only, |
| 5065 | Valtype* calculated_value) |
| 5066 | { |
| 5067 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5068 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5069 | |
| 5070 | Valtype addend = (extract_addend ? ((val & 0xffff) << 16) + addend_lo |
| 5071 | : addend_hi); |
| 5072 | |
| 5073 | Valtype32 value; |
| 5074 | if (!is_gp_disp) |
| 5075 | value = psymval->value(object, addend); |
| 5076 | else |
| 5077 | { |
| 5078 | // For MIPS16 ABI code we generate this sequence |
| 5079 | // 0: li $v0,%hi(_gp_disp) |
| 5080 | // 4: addiupc $v1,%lo(_gp_disp) |
| 5081 | // 8: sll $v0,16 |
| 5082 | // 12: addu $v0,$v1 |
| 5083 | // 14: move $gp,$v0 |
| 5084 | // So the offsets of hi and lo relocs are the same, but the |
| 5085 | // base $pc is that used by the ADDIUPC instruction at $t9 + 4. |
| 5086 | // ADDIUPC clears the low two bits of the instruction address, |
| 5087 | // so the base is ($t9 + 4) & ~3. |
| 5088 | Valtype32 gp_disp; |
| 5089 | if (r_type == elfcpp::R_MIPS16_HI16) |
| 5090 | gp_disp = (target->adjusted_gp_value(object) |
| 5091 | - ((address + 4) & ~0x3)); |
| 5092 | // The microMIPS .cpload sequence uses the same assembly |
| 5093 | // instructions as the traditional psABI version, but the |
| 5094 | // incoming $t9 has the low bit set. |
| 5095 | else if (r_type == elfcpp::R_MICROMIPS_HI16) |
| 5096 | gp_disp = target->adjusted_gp_value(object) - address - 1; |
| 5097 | else |
| 5098 | gp_disp = target->adjusted_gp_value(object) - address; |
| 5099 | value = gp_disp + addend; |
| 5100 | } |
| 5101 | Valtype x = ((value + 0x8000) >> 16) & 0xffff; |
| 5102 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5103 | |
| 5104 | if (calculate_only) |
| 5105 | { |
| 5106 | *calculated_value = x; |
| 5107 | return This::STATUS_OKAY; |
| 5108 | } |
| 5109 | else |
| 5110 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5111 | |
| 5112 | return (is_gp_disp ? check_overflow<16>(x) |
| 5113 | : This::STATUS_OKAY); |
| 5114 | } |
| 5115 | |
| 5116 | // R_MIPS_GOT16, R_MIPS16_GOT16, R_MICROMIPS_GOT16 |
| 5117 | static inline typename This::Status |
| 5118 | relgot16_local(unsigned char* view, |
| 5119 | const Mips_relobj<size, big_endian>* object, |
| 5120 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5121 | bool extract_addend, unsigned int r_type, unsigned int r_sym) |
| 5122 | { |
| 5123 | // Record the relocation. It will be resolved when we find lo16 part. |
| 5124 | got16_relocs.push_back(reloc_high<size, big_endian>(view, object, psymval, |
| 5125 | addend_a, r_type, r_sym, extract_addend)); |
| 5126 | return This::STATUS_OKAY; |
| 5127 | } |
| 5128 | |
| 5129 | // R_MIPS_GOT16, R_MIPS16_GOT16, R_MICROMIPS_GOT16 |
| 5130 | static inline typename This::Status |
| 5131 | do_relgot16_local(unsigned char* view, |
| 5132 | const Mips_relobj<size, big_endian>* object, |
| 5133 | const Symbol_value<size>* psymval, Mips_address addend_hi, |
| 5134 | bool extract_addend, Valtype32 addend_lo, |
| 5135 | Target_mips<size, big_endian>* target, bool calculate_only, |
| 5136 | Valtype* calculated_value) |
| 5137 | { |
| 5138 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5139 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5140 | |
| 5141 | Valtype addend = (extract_addend ? ((val & 0xffff) << 16) + addend_lo |
| 5142 | : addend_hi); |
| 5143 | |
| 5144 | // Find GOT page entry. |
| 5145 | Mips_address value = ((psymval->value(object, addend) + 0x8000) >> 16) |
| 5146 | & 0xffff; |
| 5147 | value <<= 16; |
| 5148 | unsigned int got_offset = |
| 5149 | target->got_section()->get_got_page_offset(value, object); |
| 5150 | |
| 5151 | // Resolve the relocation. |
| 5152 | Valtype x = target->got_section()->gp_offset(got_offset, object); |
| 5153 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5154 | |
| 5155 | if (calculate_only) |
| 5156 | { |
| 5157 | *calculated_value = x; |
| 5158 | return This::STATUS_OKAY; |
| 5159 | } |
| 5160 | else |
| 5161 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5162 | |
| 5163 | return check_overflow<16>(x); |
| 5164 | } |
| 5165 | |
| 5166 | // R_MIPS_LO16, R_MIPS16_LO16, R_MICROMIPS_LO16, R_MICROMIPS_HI0_LO16 |
| 5167 | static inline typename This::Status |
| 5168 | rello16(Target_mips<size, big_endian>* target, unsigned char* view, |
| 5169 | const Mips_relobj<size, big_endian>* object, |
| 5170 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5171 | bool extract_addend, Mips_address address, bool is_gp_disp, |
| 5172 | unsigned int r_type, unsigned int r_sym, unsigned int rel_type, |
| 5173 | bool calculate_only, Valtype* calculated_value) |
| 5174 | { |
| 5175 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5176 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5177 | |
| 5178 | Valtype addend = (extract_addend ? Bits<16>::sign_extend32(val & 0xffff) |
| 5179 | : addend_a); |
| 5180 | |
| 5181 | if (rel_type == elfcpp::SHT_REL) |
| 5182 | { |
| 5183 | typename This::Status reloc_status = This::STATUS_OKAY; |
| 5184 | // Resolve pending R_MIPS_HI16 relocations. |
| 5185 | typename std::list<reloc_high<size, big_endian> >::iterator it = |
| 5186 | hi16_relocs.begin(); |
| 5187 | while (it != hi16_relocs.end()) |
| 5188 | { |
| 5189 | reloc_high<size, big_endian> hi16 = *it; |
| 5190 | if (hi16.r_sym == r_sym |
| 5191 | && is_matching_lo16_reloc(hi16.r_type, r_type)) |
| 5192 | { |
| 5193 | mips_reloc_unshuffle(hi16.view, hi16.r_type, false); |
| 5194 | reloc_status = do_relhi16(hi16.view, hi16.object, hi16.psymval, |
| 5195 | hi16.addend, hi16.address, hi16.gp_disp, |
| 5196 | hi16.r_type, hi16.extract_addend, addend, |
| 5197 | target, calculate_only, calculated_value); |
| 5198 | mips_reloc_shuffle(hi16.view, hi16.r_type, false); |
| 5199 | if (reloc_status == This::STATUS_OVERFLOW) |
| 5200 | return This::STATUS_OVERFLOW; |
| 5201 | it = hi16_relocs.erase(it); |
| 5202 | } |
| 5203 | else |
| 5204 | ++it; |
| 5205 | } |
| 5206 | |
| 5207 | // Resolve pending local R_MIPS_GOT16 relocations. |
| 5208 | typename std::list<reloc_high<size, big_endian> >::iterator it2 = |
| 5209 | got16_relocs.begin(); |
| 5210 | while (it2 != got16_relocs.end()) |
| 5211 | { |
| 5212 | reloc_high<size, big_endian> got16 = *it2; |
| 5213 | if (got16.r_sym == r_sym |
| 5214 | && is_matching_lo16_reloc(got16.r_type, r_type)) |
| 5215 | { |
| 5216 | mips_reloc_unshuffle(got16.view, got16.r_type, false); |
| 5217 | |
| 5218 | reloc_status = do_relgot16_local(got16.view, got16.object, |
| 5219 | got16.psymval, got16.addend, |
| 5220 | got16.extract_addend, addend, target, |
| 5221 | calculate_only, calculated_value); |
| 5222 | |
| 5223 | mips_reloc_shuffle(got16.view, got16.r_type, false); |
| 5224 | if (reloc_status == This::STATUS_OVERFLOW) |
| 5225 | return This::STATUS_OVERFLOW; |
| 5226 | it2 = got16_relocs.erase(it2); |
| 5227 | } |
| 5228 | else |
| 5229 | ++it2; |
| 5230 | } |
| 5231 | } |
| 5232 | |
| 5233 | // Resolve R_MIPS_LO16 relocation. |
| 5234 | Valtype x; |
| 5235 | if (!is_gp_disp) |
| 5236 | x = psymval->value(object, addend); |
| 5237 | else |
| 5238 | { |
| 5239 | // See the comment for R_MIPS16_HI16 above for the reason |
| 5240 | // for this conditional. |
| 5241 | Valtype32 gp_disp; |
| 5242 | if (r_type == elfcpp::R_MIPS16_LO16) |
| 5243 | gp_disp = target->adjusted_gp_value(object) - (address & ~0x3); |
| 5244 | else if (r_type == elfcpp::R_MICROMIPS_LO16 |
| 5245 | || r_type == elfcpp::R_MICROMIPS_HI0_LO16) |
| 5246 | gp_disp = target->adjusted_gp_value(object) - address + 3; |
| 5247 | else |
| 5248 | gp_disp = target->adjusted_gp_value(object) - address + 4; |
| 5249 | // The MIPS ABI requires checking the R_MIPS_LO16 relocation |
| 5250 | // for overflow. Relocations against _gp_disp are normally |
| 5251 | // generated from the .cpload pseudo-op. It generates code |
| 5252 | // that normally looks like this: |
| 5253 | |
| 5254 | // lui $gp,%hi(_gp_disp) |
| 5255 | // addiu $gp,$gp,%lo(_gp_disp) |
| 5256 | // addu $gp,$gp,$t9 |
| 5257 | |
| 5258 | // Here $t9 holds the address of the function being called, |
| 5259 | // as required by the MIPS ELF ABI. The R_MIPS_LO16 |
| 5260 | // relocation can easily overflow in this situation, but the |
| 5261 | // R_MIPS_HI16 relocation will handle the overflow. |
| 5262 | // Therefore, we consider this a bug in the MIPS ABI, and do |
| 5263 | // not check for overflow here. |
| 5264 | x = gp_disp + addend; |
| 5265 | } |
| 5266 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5267 | |
| 5268 | if (calculate_only) |
| 5269 | *calculated_value = x; |
| 5270 | else |
| 5271 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5272 | |
| 5273 | return This::STATUS_OKAY; |
| 5274 | } |
| 5275 | |
| 5276 | // R_MIPS_CALL16, R_MIPS16_CALL16, R_MICROMIPS_CALL16 |
| 5277 | // R_MIPS_GOT16, R_MIPS16_GOT16, R_MICROMIPS_GOT16 |
| 5278 | // R_MIPS_TLS_GD, R_MIPS16_TLS_GD, R_MICROMIPS_TLS_GD |
| 5279 | // R_MIPS_TLS_GOTTPREL, R_MIPS16_TLS_GOTTPREL, R_MICROMIPS_TLS_GOTTPREL |
| 5280 | // R_MIPS_TLS_LDM, R_MIPS16_TLS_LDM, R_MICROMIPS_TLS_LDM |
| 5281 | // R_MIPS_GOT_DISP, R_MICROMIPS_GOT_DISP |
| 5282 | static inline typename This::Status |
| 5283 | relgot(unsigned char* view, int gp_offset, bool calculate_only, |
| 5284 | Valtype* calculated_value) |
| 5285 | { |
| 5286 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5287 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5288 | Valtype x = gp_offset; |
| 5289 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5290 | |
| 5291 | if (calculate_only) |
| 5292 | { |
| 5293 | *calculated_value = x; |
| 5294 | return This::STATUS_OKAY; |
| 5295 | } |
| 5296 | else |
| 5297 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5298 | |
| 5299 | return check_overflow<16>(x); |
| 5300 | } |
| 5301 | |
| 5302 | // R_MIPS_EH |
| 5303 | static inline typename This::Status |
| 5304 | releh(unsigned char* view, int gp_offset, bool calculate_only, |
| 5305 | Valtype* calculated_value) |
| 5306 | { |
| 5307 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5308 | Valtype x = gp_offset; |
| 5309 | |
| 5310 | if (calculate_only) |
| 5311 | { |
| 5312 | *calculated_value = x; |
| 5313 | return This::STATUS_OKAY; |
| 5314 | } |
| 5315 | else |
| 5316 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
| 5317 | |
| 5318 | return check_overflow<32>(x); |
| 5319 | } |
| 5320 | |
| 5321 | // R_MIPS_GOT_PAGE, R_MICROMIPS_GOT_PAGE |
| 5322 | static inline typename This::Status |
| 5323 | relgotpage(Target_mips<size, big_endian>* target, unsigned char* view, |
| 5324 | const Mips_relobj<size, big_endian>* object, |
| 5325 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5326 | bool extract_addend, bool calculate_only, |
| 5327 | Valtype* calculated_value) |
| 5328 | { |
| 5329 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5330 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); |
| 5331 | Valtype addend = extract_addend ? val & 0xffff : addend_a; |
| 5332 | |
| 5333 | // Find a GOT page entry that points to within 32KB of symbol + addend. |
| 5334 | Mips_address value = (psymval->value(object, addend) + 0x8000) & ~0xffff; |
| 5335 | unsigned int got_offset = |
| 5336 | target->got_section()->get_got_page_offset(value, object); |
| 5337 | |
| 5338 | Valtype x = target->got_section()->gp_offset(got_offset, object); |
| 5339 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5340 | |
| 5341 | if (calculate_only) |
| 5342 | { |
| 5343 | *calculated_value = x; |
| 5344 | return This::STATUS_OKAY; |
| 5345 | } |
| 5346 | else |
| 5347 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5348 | |
| 5349 | return check_overflow<16>(x); |
| 5350 | } |
| 5351 | |
| 5352 | // R_MIPS_GOT_OFST, R_MICROMIPS_GOT_OFST |
| 5353 | static inline typename This::Status |
| 5354 | relgotofst(Target_mips<size, big_endian>* target, unsigned char* view, |
| 5355 | const Mips_relobj<size, big_endian>* object, |
| 5356 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5357 | bool extract_addend, bool local, bool calculate_only, |
| 5358 | Valtype* calculated_value) |
| 5359 | { |
| 5360 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5361 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); |
| 5362 | Valtype addend = extract_addend ? val & 0xffff : addend_a; |
| 5363 | |
| 5364 | // For a local symbol, find a GOT page entry that points to within 32KB of |
| 5365 | // symbol + addend. Relocation value is the offset of the GOT page entry's |
| 5366 | // value from symbol + addend. |
| 5367 | // For a global symbol, relocation value is addend. |
| 5368 | Valtype x; |
| 5369 | if (local) |
| 5370 | { |
| 5371 | // Find GOT page entry. |
| 5372 | Mips_address value = ((psymval->value(object, addend) + 0x8000) |
| 5373 | & ~0xffff); |
| 5374 | target->got_section()->get_got_page_offset(value, object); |
| 5375 | |
| 5376 | x = psymval->value(object, addend) - value; |
| 5377 | } |
| 5378 | else |
| 5379 | x = addend; |
| 5380 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5381 | |
| 5382 | if (calculate_only) |
| 5383 | { |
| 5384 | *calculated_value = x; |
| 5385 | return This::STATUS_OKAY; |
| 5386 | } |
| 5387 | else |
| 5388 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5389 | |
| 5390 | return check_overflow<16>(x); |
| 5391 | } |
| 5392 | |
| 5393 | // R_MIPS_GOT_HI16, R_MIPS_CALL_HI16, |
| 5394 | // R_MICROMIPS_GOT_HI16, R_MICROMIPS_CALL_HI16 |
| 5395 | static inline typename This::Status |
| 5396 | relgot_hi16(unsigned char* view, int gp_offset, bool calculate_only, |
| 5397 | Valtype* calculated_value) |
| 5398 | { |
| 5399 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5400 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5401 | Valtype x = gp_offset; |
| 5402 | x = ((x + 0x8000) >> 16) & 0xffff; |
| 5403 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5404 | |
| 5405 | if (calculate_only) |
| 5406 | *calculated_value = x; |
| 5407 | else |
| 5408 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5409 | |
| 5410 | return This::STATUS_OKAY; |
| 5411 | } |
| 5412 | |
| 5413 | // R_MIPS_GOT_LO16, R_MIPS_CALL_LO16, |
| 5414 | // R_MICROMIPS_GOT_LO16, R_MICROMIPS_CALL_LO16 |
| 5415 | static inline typename This::Status |
| 5416 | relgot_lo16(unsigned char* view, int gp_offset, bool calculate_only, |
| 5417 | Valtype* calculated_value) |
| 5418 | { |
| 5419 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5420 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5421 | Valtype x = gp_offset; |
| 5422 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5423 | |
| 5424 | if (calculate_only) |
| 5425 | *calculated_value = x; |
| 5426 | else |
| 5427 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5428 | |
| 5429 | return This::STATUS_OKAY; |
| 5430 | } |
| 5431 | |
| 5432 | // R_MIPS_GPREL16, R_MIPS16_GPREL, R_MIPS_LITERAL, R_MICROMIPS_LITERAL |
| 5433 | // R_MICROMIPS_GPREL7_S2, R_MICROMIPS_GPREL16 |
| 5434 | static inline typename This::Status |
| 5435 | relgprel(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5436 | const Symbol_value<size>* psymval, Mips_address gp, |
| 5437 | Mips_address addend_a, bool extract_addend, bool local, |
| 5438 | unsigned int r_type, bool calculate_only, |
| 5439 | Valtype* calculated_value) |
| 5440 | { |
| 5441 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5442 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5443 | |
| 5444 | Valtype addend; |
| 5445 | if (extract_addend) |
| 5446 | { |
| 5447 | if (r_type == elfcpp::R_MICROMIPS_GPREL7_S2) |
| 5448 | addend = (val & 0x7f) << 2; |
| 5449 | else |
| 5450 | addend = val & 0xffff; |
| 5451 | // Only sign-extend the addend if it was extracted from the |
| 5452 | // instruction. If the addend was separate, leave it alone, |
| 5453 | // otherwise we may lose significant bits. |
| 5454 | addend = Bits<16>::sign_extend32(addend); |
| 5455 | } |
| 5456 | else |
| 5457 | addend = addend_a; |
| 5458 | |
| 5459 | Valtype x = psymval->value(object, addend) - gp; |
| 5460 | |
| 5461 | // If the symbol was local, any earlier relocatable links will |
| 5462 | // have adjusted its addend with the gp offset, so compensate |
| 5463 | // for that now. Don't do it for symbols forced local in this |
| 5464 | // link, though, since they won't have had the gp offset applied |
| 5465 | // to them before. |
| 5466 | if (local) |
| 5467 | x += object->gp_value(); |
| 5468 | |
| 5469 | if (r_type == elfcpp::R_MICROMIPS_GPREL7_S2) |
| 5470 | val = Bits<32>::bit_select32(val, x, 0x7f); |
| 5471 | else |
| 5472 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5473 | |
| 5474 | if (calculate_only) |
| 5475 | { |
| 5476 | *calculated_value = x; |
| 5477 | return This::STATUS_OKAY; |
| 5478 | } |
| 5479 | else |
| 5480 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5481 | |
| 5482 | if (check_overflow<16>(x) == This::STATUS_OVERFLOW) |
| 5483 | { |
| 5484 | gold_error(_("small-data section exceeds 64KB; lower small-data size " |
| 5485 | "limit (see option -G)")); |
| 5486 | return This::STATUS_OVERFLOW; |
| 5487 | } |
| 5488 | return This::STATUS_OKAY; |
| 5489 | } |
| 5490 | |
| 5491 | // R_MIPS_GPREL32 |
| 5492 | static inline typename This::Status |
| 5493 | relgprel32(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5494 | const Symbol_value<size>* psymval, Mips_address gp, |
| 5495 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 5496 | Valtype* calculated_value) |
| 5497 | { |
| 5498 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5499 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5500 | Valtype addend = extract_addend ? val : addend_a; |
| 5501 | |
| 5502 | // R_MIPS_GPREL32 relocations are defined for local symbols only. |
| 5503 | Valtype x = psymval->value(object, addend) + object->gp_value() - gp; |
| 5504 | |
| 5505 | if (calculate_only) |
| 5506 | *calculated_value = x; |
| 5507 | else |
| 5508 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
| 5509 | |
| 5510 | return This::STATUS_OKAY; |
| 5511 | } |
| 5512 | |
| 5513 | // R_MIPS_TLS_TPREL_HI16, R_MIPS16_TLS_TPREL_HI16, R_MICROMIPS_TLS_TPREL_HI16 |
| 5514 | // R_MIPS_TLS_DTPREL_HI16, R_MIPS16_TLS_DTPREL_HI16, |
| 5515 | // R_MICROMIPS_TLS_DTPREL_HI16 |
| 5516 | static inline typename This::Status |
| 5517 | tlsrelhi16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5518 | const Symbol_value<size>* psymval, Valtype32 tp_offset, |
| 5519 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 5520 | Valtype* calculated_value) |
| 5521 | { |
| 5522 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5523 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5524 | Valtype addend = extract_addend ? val & 0xffff : addend_a; |
| 5525 | |
| 5526 | // tls symbol values are relative to tls_segment()->vaddr() |
| 5527 | Valtype x = ((psymval->value(object, addend) - tp_offset) + 0x8000) >> 16; |
| 5528 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5529 | |
| 5530 | if (calculate_only) |
| 5531 | *calculated_value = x; |
| 5532 | else |
| 5533 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5534 | |
| 5535 | return This::STATUS_OKAY; |
| 5536 | } |
| 5537 | |
| 5538 | // R_MIPS_TLS_TPREL_LO16, R_MIPS16_TLS_TPREL_LO16, R_MICROMIPS_TLS_TPREL_LO16, |
| 5539 | // R_MIPS_TLS_DTPREL_LO16, R_MIPS16_TLS_DTPREL_LO16, |
| 5540 | // R_MICROMIPS_TLS_DTPREL_LO16, |
| 5541 | static inline typename This::Status |
| 5542 | tlsrello16(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5543 | const Symbol_value<size>* psymval, Valtype32 tp_offset, |
| 5544 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 5545 | Valtype* calculated_value) |
| 5546 | { |
| 5547 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5548 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5549 | Valtype addend = extract_addend ? val & 0xffff : addend_a; |
| 5550 | |
| 5551 | // tls symbol values are relative to tls_segment()->vaddr() |
| 5552 | Valtype x = psymval->value(object, addend) - tp_offset; |
| 5553 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5554 | |
| 5555 | if (calculate_only) |
| 5556 | *calculated_value = x; |
| 5557 | else |
| 5558 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5559 | |
| 5560 | return This::STATUS_OKAY; |
| 5561 | } |
| 5562 | |
| 5563 | // R_MIPS_TLS_TPREL32, R_MIPS_TLS_TPREL64, |
| 5564 | // R_MIPS_TLS_DTPREL32, R_MIPS_TLS_DTPREL64 |
| 5565 | static inline typename This::Status |
| 5566 | tlsrel32(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5567 | const Symbol_value<size>* psymval, Valtype32 tp_offset, |
| 5568 | Mips_address addend_a, bool extract_addend, bool calculate_only, |
| 5569 | Valtype* calculated_value) |
| 5570 | { |
| 5571 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5572 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5573 | Valtype addend = extract_addend ? val : addend_a; |
| 5574 | |
| 5575 | // tls symbol values are relative to tls_segment()->vaddr() |
| 5576 | Valtype x = psymval->value(object, addend) - tp_offset; |
| 5577 | |
| 5578 | if (calculate_only) |
| 5579 | *calculated_value = x; |
| 5580 | else |
| 5581 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
| 5582 | |
| 5583 | return This::STATUS_OKAY; |
| 5584 | } |
| 5585 | |
| 5586 | // R_MIPS_SUB, R_MICROMIPS_SUB |
| 5587 | static inline typename This::Status |
| 5588 | relsub(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5589 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5590 | bool extract_addend, bool calculate_only, Valtype* calculated_value) |
| 5591 | { |
| 5592 | Valtype64* wv = reinterpret_cast<Valtype64*>(view); |
| 5593 | Valtype64 addend = (extract_addend |
| 5594 | ? elfcpp::Swap<64, big_endian>::readval(wv) |
| 5595 | : addend_a); |
| 5596 | |
| 5597 | Valtype64 x = psymval->value(object, -addend); |
| 5598 | if (calculate_only) |
| 5599 | *calculated_value = x; |
| 5600 | else |
| 5601 | elfcpp::Swap<64, big_endian>::writeval(wv, x); |
| 5602 | |
| 5603 | return This::STATUS_OKAY; |
| 5604 | } |
| 5605 | |
| 5606 | // R_MIPS_64: S + A |
| 5607 | static inline typename This::Status |
| 5608 | rel64(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5609 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5610 | bool extract_addend, bool calculate_only, Valtype* calculated_value, |
| 5611 | bool apply_addend_only) |
| 5612 | { |
| 5613 | Valtype64* wv = reinterpret_cast<Valtype64*>(view); |
| 5614 | Valtype64 addend = (extract_addend |
| 5615 | ? elfcpp::Swap<64, big_endian>::readval(wv) |
| 5616 | : addend_a); |
| 5617 | |
| 5618 | Valtype64 x = psymval->value(object, addend); |
| 5619 | if (calculate_only) |
| 5620 | *calculated_value = x; |
| 5621 | else |
| 5622 | { |
| 5623 | if (apply_addend_only) |
| 5624 | x = addend; |
| 5625 | elfcpp::Swap<64, big_endian>::writeval(wv, x); |
| 5626 | } |
| 5627 | |
| 5628 | return This::STATUS_OKAY; |
| 5629 | } |
| 5630 | |
| 5631 | // R_MIPS_HIGHER, R_MICROMIPS_HIGHER |
| 5632 | static inline typename This::Status |
| 5633 | relhigher(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5634 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5635 | bool extract_addend, bool calculate_only, Valtype* calculated_value) |
| 5636 | { |
| 5637 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5638 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5639 | Valtype addend = (extract_addend ? Bits<16>::sign_extend32(val & 0xffff) |
| 5640 | : addend_a); |
| 5641 | |
| 5642 | Valtype x = psymval->value(object, addend); |
| 5643 | x = ((x + (uint64_t) 0x80008000) >> 32) & 0xffff; |
| 5644 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5645 | |
| 5646 | if (calculate_only) |
| 5647 | *calculated_value = x; |
| 5648 | else |
| 5649 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5650 | |
| 5651 | return This::STATUS_OKAY; |
| 5652 | } |
| 5653 | |
| 5654 | // R_MIPS_HIGHEST, R_MICROMIPS_HIGHEST |
| 5655 | static inline typename This::Status |
| 5656 | relhighest(unsigned char* view, const Mips_relobj<size, big_endian>* object, |
| 5657 | const Symbol_value<size>* psymval, Mips_address addend_a, |
| 5658 | bool extract_addend, bool calculate_only, |
| 5659 | Valtype* calculated_value) |
| 5660 | { |
| 5661 | Valtype32* wv = reinterpret_cast<Valtype32*>(view); |
| 5662 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5663 | Valtype addend = (extract_addend ? Bits<16>::sign_extend32(val & 0xffff) |
| 5664 | : addend_a); |
| 5665 | |
| 5666 | Valtype x = psymval->value(object, addend); |
| 5667 | x = ((x + (uint64_t) 0x800080008000) >> 48) & 0xffff; |
| 5668 | val = Bits<32>::bit_select32(val, x, 0xffff); |
| 5669 | |
| 5670 | if (calculate_only) |
| 5671 | *calculated_value = x; |
| 5672 | else |
| 5673 | elfcpp::Swap<32, big_endian>::writeval(wv, val); |
| 5674 | |
| 5675 | return This::STATUS_OKAY; |
| 5676 | } |
| 5677 | }; |
| 5678 | |
| 5679 | template<int size, bool big_endian> |
| 5680 | typename std::list<reloc_high<size, big_endian> > |
| 5681 | Mips_relocate_functions<size, big_endian>::hi16_relocs; |
| 5682 | |
| 5683 | template<int size, bool big_endian> |
| 5684 | typename std::list<reloc_high<size, big_endian> > |
| 5685 | Mips_relocate_functions<size, big_endian>::got16_relocs; |
| 5686 | |
| 5687 | template<int size, bool big_endian> |
| 5688 | typename std::list<reloc_high<size, big_endian> > |
| 5689 | Mips_relocate_functions<size, big_endian>::pchi16_relocs; |
| 5690 | |
| 5691 | // Mips_got_info methods. |
| 5692 | |
| 5693 | // Reserve GOT entry for a GOT relocation of type R_TYPE against symbol |
| 5694 | // SYMNDX + ADDEND, where SYMNDX is a local symbol in section SHNDX in OBJECT. |
| 5695 | |
| 5696 | template<int size, bool big_endian> |
| 5697 | void |
| 5698 | Mips_got_info<size, big_endian>::record_local_got_symbol( |
| 5699 | Mips_relobj<size, big_endian>* object, unsigned int symndx, |
| 5700 | Mips_address addend, unsigned int r_type, unsigned int shndx, |
| 5701 | bool is_section_symbol) |
| 5702 | { |
| 5703 | Mips_got_entry<size, big_endian>* entry = |
| 5704 | new Mips_got_entry<size, big_endian>(object, symndx, addend, |
| 5705 | mips_elf_reloc_tls_type(r_type), |
| 5706 | shndx, is_section_symbol); |
| 5707 | this->record_got_entry(entry, object); |
| 5708 | } |
| 5709 | |
| 5710 | // Reserve GOT entry for a GOT relocation of type R_TYPE against MIPS_SYM, |
| 5711 | // in OBJECT. FOR_CALL is true if the caller is only interested in |
| 5712 | // using the GOT entry for calls. DYN_RELOC is true if R_TYPE is a dynamic |
| 5713 | // relocation. |
| 5714 | |
| 5715 | template<int size, bool big_endian> |
| 5716 | void |
| 5717 | Mips_got_info<size, big_endian>::record_global_got_symbol( |
| 5718 | Mips_symbol<size>* mips_sym, Mips_relobj<size, big_endian>* object, |
| 5719 | unsigned int r_type, bool dyn_reloc, bool for_call) |
| 5720 | { |
| 5721 | if (!for_call) |
| 5722 | mips_sym->set_got_not_only_for_calls(); |
| 5723 | |
| 5724 | // A global symbol in the GOT must also be in the dynamic symbol table. |
| 5725 | if (!mips_sym->needs_dynsym_entry() && !mips_sym->is_forced_local()) |
| 5726 | { |
| 5727 | switch (mips_sym->visibility()) |
| 5728 | { |
| 5729 | case elfcpp::STV_INTERNAL: |
| 5730 | case elfcpp::STV_HIDDEN: |
| 5731 | mips_sym->set_is_forced_local(); |
| 5732 | break; |
| 5733 | default: |
| 5734 | mips_sym->set_needs_dynsym_entry(); |
| 5735 | break; |
| 5736 | } |
| 5737 | } |
| 5738 | |
| 5739 | unsigned char tls_type = mips_elf_reloc_tls_type(r_type); |
| 5740 | if (tls_type == GOT_TLS_NONE) |
| 5741 | this->global_got_symbols_.insert(mips_sym); |
| 5742 | |
| 5743 | if (dyn_reloc) |
| 5744 | { |
| 5745 | if (mips_sym->global_got_area() == GGA_NONE) |
| 5746 | mips_sym->set_global_got_area(GGA_RELOC_ONLY); |
| 5747 | return; |
| 5748 | } |
| 5749 | |
| 5750 | Mips_got_entry<size, big_endian>* entry = |
| 5751 | new Mips_got_entry<size, big_endian>(mips_sym, tls_type); |
| 5752 | |
| 5753 | this->record_got_entry(entry, object); |
| 5754 | } |
| 5755 | |
| 5756 | // Add ENTRY to master GOT and to OBJECT's GOT. |
| 5757 | |
| 5758 | template<int size, bool big_endian> |
| 5759 | void |
| 5760 | Mips_got_info<size, big_endian>::record_got_entry( |
| 5761 | Mips_got_entry<size, big_endian>* entry, |
| 5762 | Mips_relobj<size, big_endian>* object) |
| 5763 | { |
| 5764 | this->got_entries_.insert(entry); |
| 5765 | |
| 5766 | // Create the GOT entry for the OBJECT's GOT. |
| 5767 | Mips_got_info<size, big_endian>* g = object->get_or_create_got_info(); |
| 5768 | Mips_got_entry<size, big_endian>* entry2 = |
| 5769 | new Mips_got_entry<size, big_endian>(*entry); |
| 5770 | |
| 5771 | g->got_entries_.insert(entry2); |
| 5772 | } |
| 5773 | |
| 5774 | // Record that OBJECT has a page relocation against symbol SYMNDX and |
| 5775 | // that ADDEND is the addend for that relocation. |
| 5776 | // This function creates an upper bound on the number of GOT slots |
| 5777 | // required; no attempt is made to combine references to non-overridable |
| 5778 | // global symbols across multiple input files. |
| 5779 | |
| 5780 | template<int size, bool big_endian> |
| 5781 | void |
| 5782 | Mips_got_info<size, big_endian>::record_got_page_entry( |
| 5783 | Mips_relobj<size, big_endian>* object, unsigned int symndx, int addend) |
| 5784 | { |
| 5785 | struct Got_page_range **range_ptr, *range; |
| 5786 | int old_pages, new_pages; |
| 5787 | |
| 5788 | // Find the Got_page_entry for this symbol. |
| 5789 | Got_page_entry* entry = new Got_page_entry(object, symndx); |
| 5790 | typename Got_page_entry_set::iterator it = |
| 5791 | this->got_page_entries_.find(entry); |
| 5792 | if (it != this->got_page_entries_.end()) |
| 5793 | entry = *it; |
| 5794 | else |
| 5795 | this->got_page_entries_.insert(entry); |
| 5796 | |
| 5797 | // Add the same entry to the OBJECT's GOT. |
| 5798 | Got_page_entry* entry2 = NULL; |
| 5799 | Mips_got_info<size, big_endian>* g2 = object->get_or_create_got_info(); |
| 5800 | if (g2->got_page_entries_.find(entry) == g2->got_page_entries_.end()) |
| 5801 | { |
| 5802 | entry2 = new Got_page_entry(*entry); |
| 5803 | g2->got_page_entries_.insert(entry2); |
| 5804 | } |
| 5805 | |
| 5806 | // Skip over ranges whose maximum extent cannot share a page entry |
| 5807 | // with ADDEND. |
| 5808 | range_ptr = &entry->ranges; |
| 5809 | while (*range_ptr && addend > (*range_ptr)->max_addend + 0xffff) |
| 5810 | range_ptr = &(*range_ptr)->next; |
| 5811 | |
| 5812 | // If we scanned to the end of the list, or found a range whose |
| 5813 | // minimum extent cannot share a page entry with ADDEND, create |
| 5814 | // a new singleton range. |
| 5815 | range = *range_ptr; |
| 5816 | if (!range || addend < range->min_addend - 0xffff) |
| 5817 | { |
| 5818 | range = new Got_page_range(); |
| 5819 | range->next = *range_ptr; |
| 5820 | range->min_addend = addend; |
| 5821 | range->max_addend = addend; |
| 5822 | |
| 5823 | *range_ptr = range; |
| 5824 | ++entry->num_pages; |
| 5825 | if (entry2 != NULL) |
| 5826 | ++entry2->num_pages; |
| 5827 | ++this->page_gotno_; |
| 5828 | ++g2->page_gotno_; |
| 5829 | return; |
| 5830 | } |
| 5831 | |
| 5832 | // Remember how many pages the old range contributed. |
| 5833 | old_pages = range->get_max_pages(); |
| 5834 | |
| 5835 | // Update the ranges. |
| 5836 | if (addend < range->min_addend) |
| 5837 | range->min_addend = addend; |
| 5838 | else if (addend > range->max_addend) |
| 5839 | { |
| 5840 | if (range->next && addend >= range->next->min_addend - 0xffff) |
| 5841 | { |
| 5842 | old_pages += range->next->get_max_pages(); |
| 5843 | range->max_addend = range->next->max_addend; |
| 5844 | range->next = range->next->next; |
| 5845 | } |
| 5846 | else |
| 5847 | range->max_addend = addend; |
| 5848 | } |
| 5849 | |
| 5850 | // Record any change in the total estimate. |
| 5851 | new_pages = range->get_max_pages(); |
| 5852 | if (old_pages != new_pages) |
| 5853 | { |
| 5854 | entry->num_pages += new_pages - old_pages; |
| 5855 | if (entry2 != NULL) |
| 5856 | entry2->num_pages += new_pages - old_pages; |
| 5857 | this->page_gotno_ += new_pages - old_pages; |
| 5858 | g2->page_gotno_ += new_pages - old_pages; |
| 5859 | } |
| 5860 | } |
| 5861 | |
| 5862 | // Create all entries that should be in the local part of the GOT. |
| 5863 | |
| 5864 | template<int size, bool big_endian> |
| 5865 | void |
| 5866 | Mips_got_info<size, big_endian>::add_local_entries( |
| 5867 | Target_mips<size, big_endian>* target, Layout* layout) |
| 5868 | { |
| 5869 | Mips_output_data_got<size, big_endian>* got = target->got_section(); |
| 5870 | // First two GOT entries are reserved. The first entry will be filled at |
| 5871 | // runtime. The second entry will be used by some runtime loaders. |
| 5872 | got->add_constant(0); |
| 5873 | got->add_constant(target->mips_elf_gnu_got1_mask()); |
| 5874 | |
| 5875 | for (typename Got_entry_set::iterator |
| 5876 | p = this->got_entries_.begin(); |
| 5877 | p != this->got_entries_.end(); |
| 5878 | ++p) |
| 5879 | { |
| 5880 | Mips_got_entry<size, big_endian>* entry = *p; |
| 5881 | if (entry->is_for_local_symbol() && !entry->is_tls_entry()) |
| 5882 | { |
| 5883 | got->add_local(entry->object(), entry->symndx(), |
| 5884 | GOT_TYPE_STANDARD, entry->addend()); |
| 5885 | unsigned int got_offset = entry->object()->local_got_offset( |
| 5886 | entry->symndx(), GOT_TYPE_STANDARD, entry->addend()); |
| 5887 | if (got->multi_got() && this->index_ > 0 |
| 5888 | && parameters->options().output_is_position_independent()) |
| 5889 | { |
| 5890 | if (!entry->is_section_symbol()) |
| 5891 | target->rel_dyn_section(layout)->add_local(entry->object(), |
| 5892 | entry->symndx(), elfcpp::R_MIPS_REL32, got, got_offset); |
| 5893 | else |
| 5894 | target->rel_dyn_section(layout)->add_symbolless_local_addend( |
| 5895 | entry->object(), entry->symndx(), elfcpp::R_MIPS_REL32, |
| 5896 | got, got_offset); |
| 5897 | } |
| 5898 | } |
| 5899 | } |
| 5900 | |
| 5901 | this->add_page_entries(target, layout); |
| 5902 | |
| 5903 | // Add global entries that should be in the local area. |
| 5904 | for (typename Got_entry_set::iterator |
| 5905 | p = this->got_entries_.begin(); |
| 5906 | p != this->got_entries_.end(); |
| 5907 | ++p) |
| 5908 | { |
| 5909 | Mips_got_entry<size, big_endian>* entry = *p; |
| 5910 | if (!entry->is_for_global_symbol()) |
| 5911 | continue; |
| 5912 | |
| 5913 | Mips_symbol<size>* mips_sym = entry->sym(); |
| 5914 | if (mips_sym->global_got_area() == GGA_NONE && !entry->is_tls_entry()) |
| 5915 | { |
| 5916 | unsigned int got_type; |
| 5917 | if (!got->multi_got()) |
| 5918 | got_type = GOT_TYPE_STANDARD; |
| 5919 | else |
| 5920 | got_type = GOT_TYPE_STANDARD_MULTIGOT + this->index_; |
| 5921 | if (got->add_global(mips_sym, got_type)) |
| 5922 | { |
| 5923 | mips_sym->set_global_gotoffset(mips_sym->got_offset(got_type)); |
| 5924 | if (got->multi_got() && this->index_ > 0 |
| 5925 | && parameters->options().output_is_position_independent()) |
| 5926 | target->rel_dyn_section(layout)->add_symbolless_global_addend( |
| 5927 | mips_sym, elfcpp::R_MIPS_REL32, got, |
| 5928 | mips_sym->got_offset(got_type)); |
| 5929 | } |
| 5930 | } |
| 5931 | } |
| 5932 | } |
| 5933 | |
| 5934 | // Create GOT page entries. |
| 5935 | |
| 5936 | template<int size, bool big_endian> |
| 5937 | void |
| 5938 | Mips_got_info<size, big_endian>::add_page_entries( |
| 5939 | Target_mips<size, big_endian>* target, Layout* layout) |
| 5940 | { |
| 5941 | if (this->page_gotno_ == 0) |
| 5942 | return; |
| 5943 | |
| 5944 | Mips_output_data_got<size, big_endian>* got = target->got_section(); |
| 5945 | this->got_page_offset_start_ = got->add_constant(0); |
| 5946 | if (got->multi_got() && this->index_ > 0 |
| 5947 | && parameters->options().output_is_position_independent()) |
| 5948 | target->rel_dyn_section(layout)->add_absolute(elfcpp::R_MIPS_REL32, got, |
| 5949 | this->got_page_offset_start_); |
| 5950 | int num_entries = this->page_gotno_; |
| 5951 | unsigned int prev_offset = this->got_page_offset_start_; |
| 5952 | while (--num_entries > 0) |
| 5953 | { |
| 5954 | unsigned int next_offset = got->add_constant(0); |
| 5955 | if (got->multi_got() && this->index_ > 0 |
| 5956 | && parameters->options().output_is_position_independent()) |
| 5957 | target->rel_dyn_section(layout)->add_absolute(elfcpp::R_MIPS_REL32, got, |
| 5958 | next_offset); |
| 5959 | gold_assert(next_offset == prev_offset + size/8); |
| 5960 | prev_offset = next_offset; |
| 5961 | } |
| 5962 | this->got_page_offset_next_ = this->got_page_offset_start_; |
| 5963 | } |
| 5964 | |
| 5965 | // Create global GOT entries, both GGA_NORMAL and GGA_RELOC_ONLY. |
| 5966 | |
| 5967 | template<int size, bool big_endian> |
| 5968 | void |
| 5969 | Mips_got_info<size, big_endian>::add_global_entries( |
| 5970 | Target_mips<size, big_endian>* target, Layout* layout, |
| 5971 | unsigned int non_reloc_only_global_gotno) |
| 5972 | { |
| 5973 | Mips_output_data_got<size, big_endian>* got = target->got_section(); |
| 5974 | // Add GGA_NORMAL entries. |
| 5975 | unsigned int count = 0; |
| 5976 | for (typename Got_entry_set::iterator |
| 5977 | p = this->got_entries_.begin(); |
| 5978 | p != this->got_entries_.end(); |
| 5979 | ++p) |
| 5980 | { |
| 5981 | Mips_got_entry<size, big_endian>* entry = *p; |
| 5982 | if (!entry->is_for_global_symbol()) |
| 5983 | continue; |
| 5984 | |
| 5985 | Mips_symbol<size>* mips_sym = entry->sym(); |
| 5986 | if (mips_sym->global_got_area() != GGA_NORMAL) |
| 5987 | continue; |
| 5988 | |
| 5989 | unsigned int got_type; |
| 5990 | if (!got->multi_got()) |
| 5991 | got_type = GOT_TYPE_STANDARD; |
| 5992 | else |
| 5993 | // In multi-GOT links, global symbol can be in both primary and |
| 5994 | // secondary GOT(s). By creating custom GOT type |
| 5995 | // (GOT_TYPE_STANDARD_MULTIGOT + got_index) we ensure that symbol |
| 5996 | // is added to secondary GOT(s). |
| 5997 | got_type = GOT_TYPE_STANDARD_MULTIGOT + this->index_; |
| 5998 | if (!got->add_global(mips_sym, got_type)) |
| 5999 | continue; |
| 6000 | |
| 6001 | mips_sym->set_global_gotoffset(mips_sym->got_offset(got_type)); |
| 6002 | if (got->multi_got() && this->index_ == 0) |
| 6003 | count++; |
| 6004 | if (got->multi_got() && this->index_ > 0) |
| 6005 | { |
| 6006 | if (parameters->options().output_is_position_independent() |
| 6007 | || (!parameters->doing_static_link() |
| 6008 | && mips_sym->is_from_dynobj() && !mips_sym->is_undefined())) |
| 6009 | { |
| 6010 | target->rel_dyn_section(layout)->add_global( |
| 6011 | mips_sym, elfcpp::R_MIPS_REL32, got, |
| 6012 | mips_sym->got_offset(got_type)); |
| 6013 | got->add_secondary_got_reloc(mips_sym->got_offset(got_type), |
| 6014 | elfcpp::R_MIPS_REL32, mips_sym); |
| 6015 | } |
| 6016 | } |
| 6017 | } |
| 6018 | |
| 6019 | if (!got->multi_got() || this->index_ == 0) |
| 6020 | { |
| 6021 | if (got->multi_got()) |
| 6022 | { |
| 6023 | // We need to allocate space in the primary GOT for GGA_NORMAL entries |
| 6024 | // of secondary GOTs, to ensure that GOT offsets of GGA_RELOC_ONLY |
| 6025 | // entries correspond to dynamic symbol indexes. |
| 6026 | while (count < non_reloc_only_global_gotno) |
| 6027 | { |
| 6028 | got->add_constant(0); |
| 6029 | ++count; |
| 6030 | } |
| 6031 | } |
| 6032 | |
| 6033 | // Add GGA_RELOC_ONLY entries. |
| 6034 | got->add_reloc_only_entries(); |
| 6035 | } |
| 6036 | } |
| 6037 | |
| 6038 | // Create global GOT entries that should be in the GGA_RELOC_ONLY area. |
| 6039 | |
| 6040 | template<int size, bool big_endian> |
| 6041 | void |
| 6042 | Mips_got_info<size, big_endian>::add_reloc_only_entries( |
| 6043 | Mips_output_data_got<size, big_endian>* got) |
| 6044 | { |
| 6045 | for (typename Global_got_entry_set::iterator |
| 6046 | p = this->global_got_symbols_.begin(); |
| 6047 | p != this->global_got_symbols_.end(); |
| 6048 | ++p) |
| 6049 | { |
| 6050 | Mips_symbol<size>* mips_sym = *p; |
| 6051 | if (mips_sym->global_got_area() == GGA_RELOC_ONLY) |
| 6052 | { |
| 6053 | unsigned int got_type; |
| 6054 | if (!got->multi_got()) |
| 6055 | got_type = GOT_TYPE_STANDARD; |
| 6056 | else |
| 6057 | got_type = GOT_TYPE_STANDARD_MULTIGOT; |
| 6058 | if (got->add_global(mips_sym, got_type)) |
| 6059 | mips_sym->set_global_gotoffset(mips_sym->got_offset(got_type)); |
| 6060 | } |
| 6061 | } |
| 6062 | } |
| 6063 | |
| 6064 | // Create TLS GOT entries. |
| 6065 | |
| 6066 | template<int size, bool big_endian> |
| 6067 | void |
| 6068 | Mips_got_info<size, big_endian>::add_tls_entries( |
| 6069 | Target_mips<size, big_endian>* target, Layout* layout) |
| 6070 | { |
| 6071 | Mips_output_data_got<size, big_endian>* got = target->got_section(); |
| 6072 | // Add local tls entries. |
| 6073 | for (typename Got_entry_set::iterator |
| 6074 | p = this->got_entries_.begin(); |
| 6075 | p != this->got_entries_.end(); |
| 6076 | ++p) |
| 6077 | { |
| 6078 | Mips_got_entry<size, big_endian>* entry = *p; |
| 6079 | if (!entry->is_tls_entry() || !entry->is_for_local_symbol()) |
| 6080 | continue; |
| 6081 | |
| 6082 | if (entry->tls_type() == GOT_TLS_GD) |
| 6083 | { |
| 6084 | unsigned int got_type = GOT_TYPE_TLS_PAIR; |
| 6085 | unsigned int r_type1 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPMOD32 |
| 6086 | : elfcpp::R_MIPS_TLS_DTPMOD64); |
| 6087 | unsigned int r_type2 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPREL32 |
| 6088 | : elfcpp::R_MIPS_TLS_DTPREL64); |
| 6089 | |
| 6090 | if (!parameters->doing_static_link()) |
| 6091 | { |
| 6092 | got->add_local_pair_with_rel(entry->object(), entry->symndx(), |
| 6093 | entry->shndx(), got_type, |
| 6094 | target->rel_dyn_section(layout), |
| 6095 | r_type1, entry->addend()); |
| 6096 | unsigned int got_offset = |
| 6097 | entry->object()->local_got_offset(entry->symndx(), got_type, |
| 6098 | entry->addend()); |
| 6099 | got->add_static_reloc(got_offset + size/8, r_type2, |
| 6100 | entry->object(), entry->symndx()); |
| 6101 | } |
| 6102 | else |
| 6103 | { |
| 6104 | // We are doing a static link. Mark it as belong to module 1, |
| 6105 | // the executable. |
| 6106 | unsigned int got_offset = got->add_constant(1); |
| 6107 | entry->object()->set_local_got_offset(entry->symndx(), got_type, |
| 6108 | got_offset, |
| 6109 | entry->addend()); |
| 6110 | got->add_constant(0); |
| 6111 | got->add_static_reloc(got_offset + size/8, r_type2, |
| 6112 | entry->object(), entry->symndx()); |
| 6113 | } |
| 6114 | } |
| 6115 | else if (entry->tls_type() == GOT_TLS_IE) |
| 6116 | { |
| 6117 | unsigned int got_type = GOT_TYPE_TLS_OFFSET; |
| 6118 | unsigned int r_type = (size == 32 ? elfcpp::R_MIPS_TLS_TPREL32 |
| 6119 | : elfcpp::R_MIPS_TLS_TPREL64); |
| 6120 | if (!parameters->doing_static_link()) |
| 6121 | got->add_local_with_rel(entry->object(), entry->symndx(), got_type, |
| 6122 | target->rel_dyn_section(layout), r_type, |
| 6123 | entry->addend()); |
| 6124 | else |
| 6125 | { |
| 6126 | got->add_local(entry->object(), entry->symndx(), got_type, |
| 6127 | entry->addend()); |
| 6128 | unsigned int got_offset = |
| 6129 | entry->object()->local_got_offset(entry->symndx(), got_type, |
| 6130 | entry->addend()); |
| 6131 | got->add_static_reloc(got_offset, r_type, entry->object(), |
| 6132 | entry->symndx()); |
| 6133 | } |
| 6134 | } |
| 6135 | else if (entry->tls_type() == GOT_TLS_LDM) |
| 6136 | { |
| 6137 | unsigned int r_type = (size == 32 ? elfcpp::R_MIPS_TLS_DTPMOD32 |
| 6138 | : elfcpp::R_MIPS_TLS_DTPMOD64); |
| 6139 | unsigned int got_offset; |
| 6140 | if (!parameters->doing_static_link()) |
| 6141 | { |
| 6142 | got_offset = got->add_constant(0); |
| 6143 | target->rel_dyn_section(layout)->add_local( |
| 6144 | entry->object(), 0, r_type, got, got_offset); |
| 6145 | } |
| 6146 | else |
| 6147 | // We are doing a static link. Just mark it as belong to module 1, |
| 6148 | // the executable. |
| 6149 | got_offset = got->add_constant(1); |
| 6150 | |
| 6151 | got->add_constant(0); |
| 6152 | got->set_tls_ldm_offset(got_offset, entry->object()); |
| 6153 | } |
| 6154 | else |
| 6155 | gold_unreachable(); |
| 6156 | } |
| 6157 | |
| 6158 | // Add global tls entries. |
| 6159 | for (typename Got_entry_set::iterator |
| 6160 | p = this->got_entries_.begin(); |
| 6161 | p != this->got_entries_.end(); |
| 6162 | ++p) |
| 6163 | { |
| 6164 | Mips_got_entry<size, big_endian>* entry = *p; |
| 6165 | if (!entry->is_tls_entry() || !entry->is_for_global_symbol()) |
| 6166 | continue; |
| 6167 | |
| 6168 | Mips_symbol<size>* mips_sym = entry->sym(); |
| 6169 | if (entry->tls_type() == GOT_TLS_GD) |
| 6170 | { |
| 6171 | unsigned int got_type; |
| 6172 | if (!got->multi_got()) |
| 6173 | got_type = GOT_TYPE_TLS_PAIR; |
| 6174 | else |
| 6175 | got_type = GOT_TYPE_TLS_PAIR_MULTIGOT + this->index_; |
| 6176 | unsigned int r_type1 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPMOD32 |
| 6177 | : elfcpp::R_MIPS_TLS_DTPMOD64); |
| 6178 | unsigned int r_type2 = (size == 32 ? elfcpp::R_MIPS_TLS_DTPREL32 |
| 6179 | : elfcpp::R_MIPS_TLS_DTPREL64); |
| 6180 | if (!parameters->doing_static_link()) |
| 6181 | got->add_global_pair_with_rel(mips_sym, got_type, |
| 6182 | target->rel_dyn_section(layout), r_type1, r_type2); |
| 6183 | else |
| 6184 | { |
| 6185 | // Add a GOT pair for for R_MIPS_TLS_GD. The creates a pair of |
| 6186 | // GOT entries. The first one is initialized to be 1, which is the |
| 6187 | // module index for the main executable and the second one 0. A |
| 6188 | // reloc of the type R_MIPS_TLS_DTPREL32/64 will be created for |
| 6189 | // the second GOT entry and will be applied by gold. |
| 6190 | unsigned int got_offset = got->add_constant(1); |
| 6191 | mips_sym->set_got_offset(got_type, got_offset); |
| 6192 | got->add_constant(0); |
| 6193 | got->add_static_reloc(got_offset + size/8, r_type2, mips_sym); |
| 6194 | } |
| 6195 | } |
| 6196 | else if (entry->tls_type() == GOT_TLS_IE) |
| 6197 | { |
| 6198 | unsigned int got_type; |
| 6199 | if (!got->multi_got()) |
| 6200 | got_type = GOT_TYPE_TLS_OFFSET; |
| 6201 | else |
| 6202 | got_type = GOT_TYPE_TLS_OFFSET_MULTIGOT + this->index_; |
| 6203 | unsigned int r_type = (size == 32 ? elfcpp::R_MIPS_TLS_TPREL32 |
| 6204 | : elfcpp::R_MIPS_TLS_TPREL64); |
| 6205 | if (!parameters->doing_static_link()) |
| 6206 | got->add_global_with_rel(mips_sym, got_type, |
| 6207 | target->rel_dyn_section(layout), r_type); |
| 6208 | else |
| 6209 | { |
| 6210 | got->add_global(mips_sym, got_type); |
| 6211 | unsigned int got_offset = mips_sym->got_offset(got_type); |
| 6212 | got->add_static_reloc(got_offset, r_type, mips_sym); |
| 6213 | } |
| 6214 | } |
| 6215 | else |
| 6216 | gold_unreachable(); |
| 6217 | } |
| 6218 | } |
| 6219 | |
| 6220 | // Decide whether the symbol needs an entry in the global part of the primary |
| 6221 | // GOT, setting global_got_area accordingly. Count the number of global |
| 6222 | // symbols that are in the primary GOT only because they have dynamic |
| 6223 | // relocations R_MIPS_REL32 against them (reloc_only_gotno). |
| 6224 | |
| 6225 | template<int size, bool big_endian> |
| 6226 | void |
| 6227 | Mips_got_info<size, big_endian>::count_got_symbols(Symbol_table* symtab) |
| 6228 | { |
| 6229 | for (typename Global_got_entry_set::iterator |
| 6230 | p = this->global_got_symbols_.begin(); |
| 6231 | p != this->global_got_symbols_.end(); |
| 6232 | ++p) |
| 6233 | { |
| 6234 | Mips_symbol<size>* sym = *p; |
| 6235 | // Make a final decision about whether the symbol belongs in the |
| 6236 | // local or global GOT. Symbols that bind locally can (and in the |
| 6237 | // case of forced-local symbols, must) live in the local GOT. |
| 6238 | // Those that are aren't in the dynamic symbol table must also |
| 6239 | // live in the local GOT. |
| 6240 | |
| 6241 | if (!sym->should_add_dynsym_entry(symtab) |
| 6242 | || (sym->got_only_for_calls() |
| 6243 | ? symbol_calls_local(sym, sym->should_add_dynsym_entry(symtab)) |
| 6244 | : symbol_references_local(sym, |
| 6245 | sym->should_add_dynsym_entry(symtab)))) |
| 6246 | // The symbol belongs in the local GOT. We no longer need this |
| 6247 | // entry if it was only used for relocations; those relocations |
| 6248 | // will be against the null or section symbol instead. |
| 6249 | sym->set_global_got_area(GGA_NONE); |
| 6250 | else if (sym->global_got_area() == GGA_RELOC_ONLY) |
| 6251 | { |
| 6252 | ++this->reloc_only_gotno_; |
| 6253 | ++this->global_gotno_ ; |
| 6254 | } |
| 6255 | } |
| 6256 | } |
| 6257 | |
| 6258 | // Return the offset of GOT page entry for VALUE. Initialize the entry with |
| 6259 | // VALUE if it is not initialized. |
| 6260 | |
| 6261 | template<int size, bool big_endian> |
| 6262 | unsigned int |
| 6263 | Mips_got_info<size, big_endian>::get_got_page_offset(Mips_address value, |
| 6264 | Mips_output_data_got<size, big_endian>* got) |
| 6265 | { |
| 6266 | typename Got_page_offsets::iterator it = this->got_page_offsets_.find(value); |
| 6267 | if (it != this->got_page_offsets_.end()) |
| 6268 | return it->second; |
| 6269 | |
| 6270 | gold_assert(this->got_page_offset_next_ < this->got_page_offset_start_ |
| 6271 | + (size/8) * this->page_gotno_); |
| 6272 | |
| 6273 | unsigned int got_offset = this->got_page_offset_next_; |
| 6274 | this->got_page_offsets_[value] = got_offset; |
| 6275 | this->got_page_offset_next_ += size/8; |
| 6276 | got->update_got_entry(got_offset, value); |
| 6277 | return got_offset; |
| 6278 | } |
| 6279 | |
| 6280 | // Remove lazy-binding stubs for global symbols in this GOT. |
| 6281 | |
| 6282 | template<int size, bool big_endian> |
| 6283 | void |
| 6284 | Mips_got_info<size, big_endian>::remove_lazy_stubs( |
| 6285 | Target_mips<size, big_endian>* target) |
| 6286 | { |
| 6287 | for (typename Got_entry_set::iterator |
| 6288 | p = this->got_entries_.begin(); |
| 6289 | p != this->got_entries_.end(); |
| 6290 | ++p) |
| 6291 | { |
| 6292 | Mips_got_entry<size, big_endian>* entry = *p; |
| 6293 | if (entry->is_for_global_symbol()) |
| 6294 | target->remove_lazy_stub_entry(entry->sym()); |
| 6295 | } |
| 6296 | } |
| 6297 | |
| 6298 | // Count the number of GOT entries required. |
| 6299 | |
| 6300 | template<int size, bool big_endian> |
| 6301 | void |
| 6302 | Mips_got_info<size, big_endian>::count_got_entries() |
| 6303 | { |
| 6304 | for (typename Got_entry_set::iterator |
| 6305 | p = this->got_entries_.begin(); |
| 6306 | p != this->got_entries_.end(); |
| 6307 | ++p) |
| 6308 | { |
| 6309 | this->count_got_entry(*p); |
| 6310 | } |
| 6311 | } |
| 6312 | |
| 6313 | // Count the number of GOT entries required by ENTRY. Accumulate the result. |
| 6314 | |
| 6315 | template<int size, bool big_endian> |
| 6316 | void |
| 6317 | Mips_got_info<size, big_endian>::count_got_entry( |
| 6318 | Mips_got_entry<size, big_endian>* entry) |
| 6319 | { |
| 6320 | if (entry->is_tls_entry()) |
| 6321 | this->tls_gotno_ += mips_tls_got_entries(entry->tls_type()); |
| 6322 | else if (entry->is_for_local_symbol() |
| 6323 | || entry->sym()->global_got_area() == GGA_NONE) |
| 6324 | ++this->local_gotno_; |
| 6325 | else |
| 6326 | ++this->global_gotno_; |
| 6327 | } |
| 6328 | |
| 6329 | // Add FROM's GOT entries. |
| 6330 | |
| 6331 | template<int size, bool big_endian> |
| 6332 | void |
| 6333 | Mips_got_info<size, big_endian>::add_got_entries( |
| 6334 | Mips_got_info<size, big_endian>* from) |
| 6335 | { |
| 6336 | for (typename Got_entry_set::iterator |
| 6337 | p = from->got_entries_.begin(); |
| 6338 | p != from->got_entries_.end(); |
| 6339 | ++p) |
| 6340 | { |
| 6341 | Mips_got_entry<size, big_endian>* entry = *p; |
| 6342 | if (this->got_entries_.find(entry) == this->got_entries_.end()) |
| 6343 | { |
| 6344 | Mips_got_entry<size, big_endian>* entry2 = |
| 6345 | new Mips_got_entry<size, big_endian>(*entry); |
| 6346 | this->got_entries_.insert(entry2); |
| 6347 | this->count_got_entry(entry); |
| 6348 | } |
| 6349 | } |
| 6350 | } |
| 6351 | |
| 6352 | // Add FROM's GOT page entries. |
| 6353 | |
| 6354 | template<int size, bool big_endian> |
| 6355 | void |
| 6356 | Mips_got_info<size, big_endian>::add_got_page_entries( |
| 6357 | Mips_got_info<size, big_endian>* from) |
| 6358 | { |
| 6359 | for (typename Got_page_entry_set::iterator |
| 6360 | p = from->got_page_entries_.begin(); |
| 6361 | p != from->got_page_entries_.end(); |
| 6362 | ++p) |
| 6363 | { |
| 6364 | Got_page_entry* entry = *p; |
| 6365 | if (this->got_page_entries_.find(entry) == this->got_page_entries_.end()) |
| 6366 | { |
| 6367 | Got_page_entry* entry2 = new Got_page_entry(*entry); |
| 6368 | this->got_page_entries_.insert(entry2); |
| 6369 | this->page_gotno_ += entry->num_pages; |
| 6370 | } |
| 6371 | } |
| 6372 | } |
| 6373 | |
| 6374 | // Mips_output_data_got methods. |
| 6375 | |
| 6376 | // Lay out the GOT. Add local, global and TLS entries. If GOT is |
| 6377 | // larger than 64K, create multi-GOT. |
| 6378 | |
| 6379 | template<int size, bool big_endian> |
| 6380 | void |
| 6381 | Mips_output_data_got<size, big_endian>::lay_out_got(Layout* layout, |
| 6382 | Symbol_table* symtab, const Input_objects* input_objects) |
| 6383 | { |
| 6384 | // Decide which symbols need to go in the global part of the GOT and |
| 6385 | // count the number of reloc-only GOT symbols. |
| 6386 | this->master_got_info_->count_got_symbols(symtab); |
| 6387 | |
| 6388 | // Count the number of GOT entries. |
| 6389 | this->master_got_info_->count_got_entries(); |
| 6390 | |
| 6391 | unsigned int got_size = this->master_got_info_->got_size(); |
| 6392 | if (got_size > Target_mips<size, big_endian>::MIPS_GOT_MAX_SIZE) |
| 6393 | this->lay_out_multi_got(layout, input_objects); |
| 6394 | else |
| 6395 | { |
| 6396 | // Record that all objects use single GOT. |
| 6397 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 6398 | p != input_objects->relobj_end(); |
| 6399 | ++p) |
| 6400 | { |
| 6401 | Mips_relobj<size, big_endian>* object = |
| 6402 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); |
| 6403 | if (object->get_got_info() != NULL) |
| 6404 | object->set_got_info(this->master_got_info_); |
| 6405 | } |
| 6406 | |
| 6407 | this->master_got_info_->add_local_entries(this->target_, layout); |
| 6408 | this->master_got_info_->add_global_entries(this->target_, layout, |
| 6409 | /*not used*/-1U); |
| 6410 | this->master_got_info_->add_tls_entries(this->target_, layout); |
| 6411 | } |
| 6412 | } |
| 6413 | |
| 6414 | // Create multi-GOT. For every GOT, add local, global and TLS entries. |
| 6415 | |
| 6416 | template<int size, bool big_endian> |
| 6417 | void |
| 6418 | Mips_output_data_got<size, big_endian>::lay_out_multi_got(Layout* layout, |
| 6419 | const Input_objects* input_objects) |
| 6420 | { |
| 6421 | // Try to merge the GOTs of input objects together, as long as they |
| 6422 | // don't seem to exceed the maximum GOT size, choosing one of them |
| 6423 | // to be the primary GOT. |
| 6424 | this->merge_gots(input_objects); |
| 6425 | |
| 6426 | // Every symbol that is referenced in a dynamic relocation must be |
| 6427 | // present in the primary GOT. |
| 6428 | this->primary_got_->set_global_gotno(this->master_got_info_->global_gotno()); |
| 6429 | |
| 6430 | // Add GOT entries. |
| 6431 | unsigned int i = 0; |
| 6432 | unsigned int offset = 0; |
| 6433 | Mips_got_info<size, big_endian>* g = this->primary_got_; |
| 6434 | do |
| 6435 | { |
| 6436 | g->set_index(i); |
| 6437 | g->set_offset(offset); |
| 6438 | |
| 6439 | g->add_local_entries(this->target_, layout); |
| 6440 | if (i == 0) |
| 6441 | g->add_global_entries(this->target_, layout, |
| 6442 | (this->master_got_info_->global_gotno() |
| 6443 | - this->master_got_info_->reloc_only_gotno())); |
| 6444 | else |
| 6445 | g->add_global_entries(this->target_, layout, /*not used*/-1U); |
| 6446 | g->add_tls_entries(this->target_, layout); |
| 6447 | |
| 6448 | // Forbid global symbols in every non-primary GOT from having |
| 6449 | // lazy-binding stubs. |
| 6450 | if (i > 0) |
| 6451 | g->remove_lazy_stubs(this->target_); |
| 6452 | |
| 6453 | ++i; |
| 6454 | offset += g->got_size(); |
| 6455 | g = g->next(); |
| 6456 | } |
| 6457 | while (g); |
| 6458 | } |
| 6459 | |
| 6460 | // Attempt to merge GOTs of different input objects. Try to use as much as |
| 6461 | // possible of the primary GOT, since it doesn't require explicit dynamic |
| 6462 | // relocations, but don't use objects that would reference global symbols |
| 6463 | // out of the addressable range. Failing the primary GOT, attempt to merge |
| 6464 | // with the current GOT, or finish the current GOT and then make make the new |
| 6465 | // GOT current. |
| 6466 | |
| 6467 | template<int size, bool big_endian> |
| 6468 | void |
| 6469 | Mips_output_data_got<size, big_endian>::merge_gots( |
| 6470 | const Input_objects* input_objects) |
| 6471 | { |
| 6472 | gold_assert(this->primary_got_ == NULL); |
| 6473 | Mips_got_info<size, big_endian>* current = NULL; |
| 6474 | |
| 6475 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 6476 | p != input_objects->relobj_end(); |
| 6477 | ++p) |
| 6478 | { |
| 6479 | Mips_relobj<size, big_endian>* object = |
| 6480 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); |
| 6481 | |
| 6482 | Mips_got_info<size, big_endian>* g = object->get_got_info(); |
| 6483 | if (g == NULL) |
| 6484 | continue; |
| 6485 | |
| 6486 | g->count_got_entries(); |
| 6487 | |
| 6488 | // Work out the number of page, local and TLS entries. |
| 6489 | unsigned int estimate = this->master_got_info_->page_gotno(); |
| 6490 | if (estimate > g->page_gotno()) |
| 6491 | estimate = g->page_gotno(); |
| 6492 | estimate += g->local_gotno() + g->tls_gotno(); |
| 6493 | |
| 6494 | // We place TLS GOT entries after both locals and globals. The globals |
| 6495 | // for the primary GOT may overflow the normal GOT size limit, so be |
| 6496 | // sure not to merge a GOT which requires TLS with the primary GOT in that |
| 6497 | // case. This doesn't affect non-primary GOTs. |
| 6498 | estimate += (g->tls_gotno() > 0 ? this->master_got_info_->global_gotno() |
| 6499 | : g->global_gotno()); |
| 6500 | |
| 6501 | unsigned int max_count = |
| 6502 | Target_mips<size, big_endian>::MIPS_GOT_MAX_SIZE / (size/8) - 2; |
| 6503 | if (estimate <= max_count) |
| 6504 | { |
| 6505 | // If we don't have a primary GOT, use it as |
| 6506 | // a starting point for the primary GOT. |
| 6507 | if (!this->primary_got_) |
| 6508 | { |
| 6509 | this->primary_got_ = g; |
| 6510 | continue; |
| 6511 | } |
| 6512 | |
| 6513 | // Try merging with the primary GOT. |
| 6514 | if (this->merge_got_with(g, object, this->primary_got_)) |
| 6515 | continue; |
| 6516 | } |
| 6517 | |
| 6518 | // If we can merge with the last-created GOT, do it. |
| 6519 | if (current && this->merge_got_with(g, object, current)) |
| 6520 | continue; |
| 6521 | |
| 6522 | // Well, we couldn't merge, so create a new GOT. Don't check if it |
| 6523 | // fits; if it turns out that it doesn't, we'll get relocation |
| 6524 | // overflows anyway. |
| 6525 | g->set_next(current); |
| 6526 | current = g; |
| 6527 | } |
| 6528 | |
| 6529 | // If we do not find any suitable primary GOT, create an empty one. |
| 6530 | if (this->primary_got_ == NULL) |
| 6531 | this->primary_got_ = new Mips_got_info<size, big_endian>(); |
| 6532 | |
| 6533 | // Link primary GOT with secondary GOTs. |
| 6534 | this->primary_got_->set_next(current); |
| 6535 | } |
| 6536 | |
| 6537 | // Consider merging FROM, which is OBJECT's GOT, into TO. Return false if |
| 6538 | // this would lead to overflow, true if they were merged successfully. |
| 6539 | |
| 6540 | template<int size, bool big_endian> |
| 6541 | bool |
| 6542 | Mips_output_data_got<size, big_endian>::merge_got_with( |
| 6543 | Mips_got_info<size, big_endian>* from, |
| 6544 | Mips_relobj<size, big_endian>* object, |
| 6545 | Mips_got_info<size, big_endian>* to) |
| 6546 | { |
| 6547 | // Work out how many page entries we would need for the combined GOT. |
| 6548 | unsigned int estimate = this->master_got_info_->page_gotno(); |
| 6549 | if (estimate >= from->page_gotno() + to->page_gotno()) |
| 6550 | estimate = from->page_gotno() + to->page_gotno(); |
| 6551 | |
| 6552 | // Conservatively estimate how many local and TLS entries would be needed. |
| 6553 | estimate += from->local_gotno() + to->local_gotno(); |
| 6554 | estimate += from->tls_gotno() + to->tls_gotno(); |
| 6555 | |
| 6556 | // If we're merging with the primary got, any TLS relocations will |
| 6557 | // come after the full set of global entries. Otherwise estimate those |
| 6558 | // conservatively as well. |
| 6559 | if (to == this->primary_got_ && (from->tls_gotno() + to->tls_gotno()) > 0) |
| 6560 | estimate += this->master_got_info_->global_gotno(); |
| 6561 | else |
| 6562 | estimate += from->global_gotno() + to->global_gotno(); |
| 6563 | |
| 6564 | // Bail out if the combined GOT might be too big. |
| 6565 | unsigned int max_count = |
| 6566 | Target_mips<size, big_endian>::MIPS_GOT_MAX_SIZE / (size/8) - 2; |
| 6567 | if (estimate > max_count) |
| 6568 | return false; |
| 6569 | |
| 6570 | // Transfer the object's GOT information from FROM to TO. |
| 6571 | to->add_got_entries(from); |
| 6572 | to->add_got_page_entries(from); |
| 6573 | |
| 6574 | // Record that OBJECT should use output GOT TO. |
| 6575 | object->set_got_info(to); |
| 6576 | |
| 6577 | return true; |
| 6578 | } |
| 6579 | |
| 6580 | // Write out the GOT. |
| 6581 | |
| 6582 | template<int size, bool big_endian> |
| 6583 | void |
| 6584 | Mips_output_data_got<size, big_endian>::do_write(Output_file* of) |
| 6585 | { |
| 6586 | typedef Unordered_set<Mips_symbol<size>*, Mips_symbol_hash<size> > |
| 6587 | Mips_stubs_entry_set; |
| 6588 | |
| 6589 | // Call parent to write out GOT. |
| 6590 | Output_data_got<size, big_endian>::do_write(of); |
| 6591 | |
| 6592 | const off_t offset = this->offset(); |
| 6593 | const section_size_type oview_size = |
| 6594 | convert_to_section_size_type(this->data_size()); |
| 6595 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 6596 | |
| 6597 | // Needed for fixing values of .got section. |
| 6598 | this->got_view_ = oview; |
| 6599 | |
| 6600 | // Write lazy stub addresses. |
| 6601 | for (typename Mips_stubs_entry_set::iterator |
| 6602 | p = this->master_got_info_->global_got_symbols().begin(); |
| 6603 | p != this->master_got_info_->global_got_symbols().end(); |
| 6604 | ++p) |
| 6605 | { |
| 6606 | Mips_symbol<size>* mips_sym = *p; |
| 6607 | if (mips_sym->has_lazy_stub()) |
| 6608 | { |
| 6609 | Valtype* wv = reinterpret_cast<Valtype*>( |
| 6610 | oview + this->get_primary_got_offset(mips_sym)); |
| 6611 | Valtype value = |
| 6612 | this->target_->mips_stubs_section()->stub_address(mips_sym); |
| 6613 | elfcpp::Swap<size, big_endian>::writeval(wv, value); |
| 6614 | } |
| 6615 | } |
| 6616 | |
| 6617 | // Add +1 to GGA_NONE nonzero MIPS16 and microMIPS entries. |
| 6618 | for (typename Mips_stubs_entry_set::iterator |
| 6619 | p = this->master_got_info_->global_got_symbols().begin(); |
| 6620 | p != this->master_got_info_->global_got_symbols().end(); |
| 6621 | ++p) |
| 6622 | { |
| 6623 | Mips_symbol<size>* mips_sym = *p; |
| 6624 | if (!this->multi_got() |
| 6625 | && (mips_sym->is_mips16() || mips_sym->is_micromips()) |
| 6626 | && mips_sym->global_got_area() == GGA_NONE |
| 6627 | && mips_sym->has_got_offset(GOT_TYPE_STANDARD)) |
| 6628 | { |
| 6629 | Valtype* wv = reinterpret_cast<Valtype*>( |
| 6630 | oview + mips_sym->got_offset(GOT_TYPE_STANDARD)); |
| 6631 | Valtype value = elfcpp::Swap<size, big_endian>::readval(wv); |
| 6632 | if (value != 0) |
| 6633 | { |
| 6634 | value |= 1; |
| 6635 | elfcpp::Swap<size, big_endian>::writeval(wv, value); |
| 6636 | } |
| 6637 | } |
| 6638 | } |
| 6639 | |
| 6640 | if (!this->secondary_got_relocs_.empty()) |
| 6641 | { |
| 6642 | // Fixup for the secondary GOT R_MIPS_REL32 relocs. For global |
| 6643 | // secondary GOT entries with non-zero initial value copy the value |
| 6644 | // to the corresponding primary GOT entry, and set the secondary GOT |
| 6645 | // entry to zero. |
| 6646 | // TODO(sasa): This is workaround. It needs to be investigated further. |
| 6647 | |
| 6648 | for (size_t i = 0; i < this->secondary_got_relocs_.size(); ++i) |
| 6649 | { |
| 6650 | Static_reloc& reloc(this->secondary_got_relocs_[i]); |
| 6651 | if (reloc.symbol_is_global()) |
| 6652 | { |
| 6653 | Mips_symbol<size>* gsym = reloc.symbol(); |
| 6654 | gold_assert(gsym != NULL); |
| 6655 | |
| 6656 | unsigned got_offset = reloc.got_offset(); |
| 6657 | gold_assert(got_offset < oview_size); |
| 6658 | |
| 6659 | // Find primary GOT entry. |
| 6660 | Valtype* wv_prim = reinterpret_cast<Valtype*>( |
| 6661 | oview + this->get_primary_got_offset(gsym)); |
| 6662 | |
| 6663 | // Find secondary GOT entry. |
| 6664 | Valtype* wv_sec = reinterpret_cast<Valtype*>(oview + got_offset); |
| 6665 | |
| 6666 | Valtype value = elfcpp::Swap<size, big_endian>::readval(wv_sec); |
| 6667 | if (value != 0) |
| 6668 | { |
| 6669 | elfcpp::Swap<size, big_endian>::writeval(wv_prim, value); |
| 6670 | elfcpp::Swap<size, big_endian>::writeval(wv_sec, 0); |
| 6671 | gsym->set_applied_secondary_got_fixup(); |
| 6672 | } |
| 6673 | } |
| 6674 | } |
| 6675 | |
| 6676 | of->write_output_view(offset, oview_size, oview); |
| 6677 | } |
| 6678 | |
| 6679 | // We are done if there is no fix up. |
| 6680 | if (this->static_relocs_.empty()) |
| 6681 | return; |
| 6682 | |
| 6683 | Output_segment* tls_segment = this->layout_->tls_segment(); |
| 6684 | gold_assert(tls_segment != NULL); |
| 6685 | |
| 6686 | for (size_t i = 0; i < this->static_relocs_.size(); ++i) |
| 6687 | { |
| 6688 | Static_reloc& reloc(this->static_relocs_[i]); |
| 6689 | |
| 6690 | Mips_address value; |
| 6691 | if (!reloc.symbol_is_global()) |
| 6692 | { |
| 6693 | Sized_relobj_file<size, big_endian>* object = reloc.relobj(); |
| 6694 | const Symbol_value<size>* psymval = |
| 6695 | object->local_symbol(reloc.index()); |
| 6696 | |
| 6697 | // We are doing static linking. Issue an error and skip this |
| 6698 | // relocation if the symbol is undefined or in a discarded_section. |
| 6699 | bool is_ordinary; |
| 6700 | unsigned int shndx = psymval->input_shndx(&is_ordinary); |
| 6701 | if ((shndx == elfcpp::SHN_UNDEF) |
| 6702 | || (is_ordinary |
| 6703 | && shndx != elfcpp::SHN_UNDEF |
| 6704 | && !object->is_section_included(shndx) |
| 6705 | && !this->symbol_table_->is_section_folded(object, shndx))) |
| 6706 | { |
| 6707 | gold_error(_("undefined or discarded local symbol %u from " |
| 6708 | " object %s in GOT"), |
| 6709 | reloc.index(), reloc.relobj()->name().c_str()); |
| 6710 | continue; |
| 6711 | } |
| 6712 | |
| 6713 | value = psymval->value(object, 0); |
| 6714 | } |
| 6715 | else |
| 6716 | { |
| 6717 | const Mips_symbol<size>* gsym = reloc.symbol(); |
| 6718 | gold_assert(gsym != NULL); |
| 6719 | |
| 6720 | // We are doing static linking. Issue an error and skip this |
| 6721 | // relocation if the symbol is undefined or in a discarded_section |
| 6722 | // unless it is a weakly_undefined symbol. |
| 6723 | if ((gsym->is_defined_in_discarded_section() || gsym->is_undefined()) |
| 6724 | && !gsym->is_weak_undefined()) |
| 6725 | { |
| 6726 | gold_error(_("undefined or discarded symbol %s in GOT"), |
| 6727 | gsym->name()); |
| 6728 | continue; |
| 6729 | } |
| 6730 | |
| 6731 | if (!gsym->is_weak_undefined()) |
| 6732 | value = gsym->value(); |
| 6733 | else |
| 6734 | value = 0; |
| 6735 | } |
| 6736 | |
| 6737 | unsigned got_offset = reloc.got_offset(); |
| 6738 | gold_assert(got_offset < oview_size); |
| 6739 | |
| 6740 | Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset); |
| 6741 | Valtype x; |
| 6742 | |
| 6743 | switch (reloc.r_type()) |
| 6744 | { |
| 6745 | case elfcpp::R_MIPS_TLS_DTPMOD32: |
| 6746 | case elfcpp::R_MIPS_TLS_DTPMOD64: |
| 6747 | x = value; |
| 6748 | break; |
| 6749 | case elfcpp::R_MIPS_TLS_DTPREL32: |
| 6750 | case elfcpp::R_MIPS_TLS_DTPREL64: |
| 6751 | x = value - elfcpp::DTP_OFFSET; |
| 6752 | break; |
| 6753 | case elfcpp::R_MIPS_TLS_TPREL32: |
| 6754 | case elfcpp::R_MIPS_TLS_TPREL64: |
| 6755 | x = value - elfcpp::TP_OFFSET; |
| 6756 | break; |
| 6757 | default: |
| 6758 | gold_unreachable(); |
| 6759 | break; |
| 6760 | } |
| 6761 | |
| 6762 | elfcpp::Swap<size, big_endian>::writeval(wv, x); |
| 6763 | } |
| 6764 | |
| 6765 | of->write_output_view(offset, oview_size, oview); |
| 6766 | } |
| 6767 | |
| 6768 | // Mips_relobj methods. |
| 6769 | |
| 6770 | // Count the local symbols. The Mips backend needs to know if a symbol |
| 6771 | // is a MIPS16 or microMIPS function or not. For global symbols, it is easy |
| 6772 | // because the Symbol object keeps the ELF symbol type and st_other field. |
| 6773 | // For local symbol it is harder because we cannot access this information. |
| 6774 | // So we override the do_count_local_symbol in parent and scan local symbols to |
| 6775 | // mark MIPS16 and microMIPS functions. This is not the most efficient way but |
| 6776 | // I do not want to slow down other ports by calling a per symbol target hook |
| 6777 | // inside Sized_relobj_file<size, big_endian>::do_count_local_symbols. |
| 6778 | |
| 6779 | template<int size, bool big_endian> |
| 6780 | void |
| 6781 | Mips_relobj<size, big_endian>::do_count_local_symbols( |
| 6782 | Stringpool_template<char>* pool, |
| 6783 | Stringpool_template<char>* dynpool) |
| 6784 | { |
| 6785 | // Ask parent to count the local symbols. |
| 6786 | Sized_relobj_file<size, big_endian>::do_count_local_symbols(pool, dynpool); |
| 6787 | const unsigned int loccount = this->local_symbol_count(); |
| 6788 | if (loccount == 0) |
| 6789 | return; |
| 6790 | |
| 6791 | // Initialize the mips16 and micromips function bit-vector. |
| 6792 | this->local_symbol_is_mips16_.resize(loccount, false); |
| 6793 | this->local_symbol_is_micromips_.resize(loccount, false); |
| 6794 | |
| 6795 | // Read the symbol table section header. |
| 6796 | const unsigned int symtab_shndx = this->symtab_shndx(); |
| 6797 | elfcpp::Shdr<size, big_endian> |
| 6798 | symtabshdr(this, this->elf_file()->section_header(symtab_shndx)); |
| 6799 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| 6800 | |
| 6801 | // Read the local symbols. |
| 6802 | const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| 6803 | gold_assert(loccount == symtabshdr.get_sh_info()); |
| 6804 | off_t locsize = loccount * sym_size; |
| 6805 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| 6806 | locsize, true, true); |
| 6807 | |
| 6808 | // Loop over the local symbols and mark any MIPS16 or microMIPS local symbols. |
| 6809 | |
| 6810 | // Skip the first dummy symbol. |
| 6811 | psyms += sym_size; |
| 6812 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| 6813 | { |
| 6814 | elfcpp::Sym<size, big_endian> sym(psyms); |
| 6815 | unsigned char st_other = sym.get_st_other(); |
| 6816 | this->local_symbol_is_mips16_[i] = elfcpp::elf_st_is_mips16(st_other); |
| 6817 | this->local_symbol_is_micromips_[i] = |
| 6818 | elfcpp::elf_st_is_micromips(st_other); |
| 6819 | } |
| 6820 | } |
| 6821 | |
| 6822 | // Read the symbol information. |
| 6823 | |
| 6824 | template<int size, bool big_endian> |
| 6825 | void |
| 6826 | Mips_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| 6827 | { |
| 6828 | // Call parent class to read symbol information. |
| 6829 | this->base_read_symbols(sd); |
| 6830 | |
| 6831 | // If this input file is a binary file, it has no processor |
| 6832 | // specific data. |
| 6833 | Input_file::Format format = this->input_file()->format(); |
| 6834 | if (format != Input_file::FORMAT_ELF) |
| 6835 | { |
| 6836 | gold_assert(format == Input_file::FORMAT_BINARY); |
| 6837 | this->merge_processor_specific_data_ = false; |
| 6838 | return; |
| 6839 | } |
| 6840 | |
| 6841 | // Read processor-specific flags in ELF file header. |
| 6842 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, |
| 6843 | elfcpp::Elf_sizes<size>::ehdr_size, |
| 6844 | true, false); |
| 6845 | elfcpp::Ehdr<size, big_endian> ehdr(pehdr); |
| 6846 | this->processor_specific_flags_ = ehdr.get_e_flags(); |
| 6847 | |
| 6848 | // Get the section names. |
| 6849 | const unsigned char* pnamesu = sd->section_names->data(); |
| 6850 | const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| 6851 | |
| 6852 | // Initialize the mips16 stub section bit-vectors. |
| 6853 | this->section_is_mips16_fn_stub_.resize(this->shnum(), false); |
| 6854 | this->section_is_mips16_call_stub_.resize(this->shnum(), false); |
| 6855 | this->section_is_mips16_call_fp_stub_.resize(this->shnum(), false); |
| 6856 | |
| 6857 | const size_t shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 6858 | const unsigned char* pshdrs = sd->section_headers->data(); |
| 6859 | const unsigned char* ps = pshdrs + shdr_size; |
| 6860 | bool must_merge_processor_specific_data = false; |
| 6861 | for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size) |
| 6862 | { |
| 6863 | elfcpp::Shdr<size, big_endian> shdr(ps); |
| 6864 | |
| 6865 | // Sometimes an object has no contents except the section name string |
| 6866 | // table and an empty symbol table with the undefined symbol. We |
| 6867 | // don't want to merge processor-specific data from such an object. |
| 6868 | if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) |
| 6869 | { |
| 6870 | // Symbol table is not empty. |
| 6871 | const typename elfcpp::Elf_types<size>::Elf_WXword sym_size = |
| 6872 | elfcpp::Elf_sizes<size>::sym_size; |
| 6873 | if (shdr.get_sh_size() > sym_size) |
| 6874 | must_merge_processor_specific_data = true; |
| 6875 | } |
| 6876 | else if (shdr.get_sh_type() != elfcpp::SHT_STRTAB) |
| 6877 | // If this is neither an empty symbol table nor a string table, |
| 6878 | // be conservative. |
| 6879 | must_merge_processor_specific_data = true; |
| 6880 | |
| 6881 | if (shdr.get_sh_type() == elfcpp::SHT_MIPS_REGINFO) |
| 6882 | { |
| 6883 | this->has_reginfo_section_ = true; |
| 6884 | // Read the gp value that was used to create this object. We need the |
| 6885 | // gp value while processing relocs. The .reginfo section is not used |
| 6886 | // in the 64-bit MIPS ELF ABI. |
| 6887 | section_offset_type section_offset = shdr.get_sh_offset(); |
| 6888 | section_size_type section_size = |
| 6889 | convert_to_section_size_type(shdr.get_sh_size()); |
| 6890 | const unsigned char* view = |
| 6891 | this->get_view(section_offset, section_size, true, false); |
| 6892 | |
| 6893 | this->gp_ = elfcpp::Swap<size, big_endian>::readval(view + 20); |
| 6894 | |
| 6895 | // Read the rest of .reginfo. |
| 6896 | this->gprmask_ = elfcpp::Swap<size, big_endian>::readval(view); |
| 6897 | this->cprmask1_ = elfcpp::Swap<size, big_endian>::readval(view + 4); |
| 6898 | this->cprmask2_ = elfcpp::Swap<size, big_endian>::readval(view + 8); |
| 6899 | this->cprmask3_ = elfcpp::Swap<size, big_endian>::readval(view + 12); |
| 6900 | this->cprmask4_ = elfcpp::Swap<size, big_endian>::readval(view + 16); |
| 6901 | } |
| 6902 | |
| 6903 | if (shdr.get_sh_type() == elfcpp::SHT_GNU_ATTRIBUTES) |
| 6904 | { |
| 6905 | gold_assert(this->attributes_section_data_ == NULL); |
| 6906 | section_offset_type section_offset = shdr.get_sh_offset(); |
| 6907 | section_size_type section_size = |
| 6908 | convert_to_section_size_type(shdr.get_sh_size()); |
| 6909 | const unsigned char* view = |
| 6910 | this->get_view(section_offset, section_size, true, false); |
| 6911 | this->attributes_section_data_ = |
| 6912 | new Attributes_section_data(view, section_size); |
| 6913 | } |
| 6914 | |
| 6915 | if (shdr.get_sh_type() == elfcpp::SHT_MIPS_ABIFLAGS) |
| 6916 | { |
| 6917 | gold_assert(this->abiflags_ == NULL); |
| 6918 | section_offset_type section_offset = shdr.get_sh_offset(); |
| 6919 | section_size_type section_size = |
| 6920 | convert_to_section_size_type(shdr.get_sh_size()); |
| 6921 | const unsigned char* view = |
| 6922 | this->get_view(section_offset, section_size, true, false); |
| 6923 | this->abiflags_ = new Mips_abiflags<big_endian>(); |
| 6924 | |
| 6925 | this->abiflags_->version = |
| 6926 | elfcpp::Swap<16, big_endian>::readval(view); |
| 6927 | if (this->abiflags_->version != 0) |
| 6928 | { |
| 6929 | gold_error(_("%s: .MIPS.abiflags section has " |
| 6930 | "unsupported version %u"), |
| 6931 | this->name().c_str(), |
| 6932 | this->abiflags_->version); |
| 6933 | break; |
| 6934 | } |
| 6935 | this->abiflags_->isa_level = |
| 6936 | elfcpp::Swap<8, big_endian>::readval(view + 2); |
| 6937 | this->abiflags_->isa_rev = |
| 6938 | elfcpp::Swap<8, big_endian>::readval(view + 3); |
| 6939 | this->abiflags_->gpr_size = |
| 6940 | elfcpp::Swap<8, big_endian>::readval(view + 4); |
| 6941 | this->abiflags_->cpr1_size = |
| 6942 | elfcpp::Swap<8, big_endian>::readval(view + 5); |
| 6943 | this->abiflags_->cpr2_size = |
| 6944 | elfcpp::Swap<8, big_endian>::readval(view + 6); |
| 6945 | this->abiflags_->fp_abi = |
| 6946 | elfcpp::Swap<8, big_endian>::readval(view + 7); |
| 6947 | this->abiflags_->isa_ext = |
| 6948 | elfcpp::Swap<32, big_endian>::readval(view + 8); |
| 6949 | this->abiflags_->ases = |
| 6950 | elfcpp::Swap<32, big_endian>::readval(view + 12); |
| 6951 | this->abiflags_->flags1 = |
| 6952 | elfcpp::Swap<32, big_endian>::readval(view + 16); |
| 6953 | this->abiflags_->flags2 = |
| 6954 | elfcpp::Swap<32, big_endian>::readval(view + 20); |
| 6955 | } |
| 6956 | |
| 6957 | // In the 64-bit ABI, .MIPS.options section holds register information. |
| 6958 | // A SHT_MIPS_OPTIONS section contains a series of options, each of which |
| 6959 | // starts with this header: |
| 6960 | // |
| 6961 | // typedef struct |
| 6962 | // { |
| 6963 | // // Type of option. |
| 6964 | // unsigned char kind[1]; |
| 6965 | // // Size of option descriptor, including header. |
| 6966 | // unsigned char size[1]; |
| 6967 | // // Section index of affected section, or 0 for global option. |
| 6968 | // unsigned char section[2]; |
| 6969 | // // Information specific to this kind of option. |
| 6970 | // unsigned char info[4]; |
| 6971 | // }; |
| 6972 | // |
| 6973 | // For a SHT_MIPS_OPTIONS section, look for a ODK_REGINFO entry, and set |
| 6974 | // the gp value based on what we find. We may see both SHT_MIPS_REGINFO |
| 6975 | // and SHT_MIPS_OPTIONS/ODK_REGINFO; in that case, they should agree. |
| 6976 | |
| 6977 | if (shdr.get_sh_type() == elfcpp::SHT_MIPS_OPTIONS) |
| 6978 | { |
| 6979 | section_offset_type section_offset = shdr.get_sh_offset(); |
| 6980 | section_size_type section_size = |
| 6981 | convert_to_section_size_type(shdr.get_sh_size()); |
| 6982 | const unsigned char* view = |
| 6983 | this->get_view(section_offset, section_size, true, false); |
| 6984 | const unsigned char* end = view + section_size; |
| 6985 | |
| 6986 | while (view + 8 <= end) |
| 6987 | { |
| 6988 | unsigned char kind = elfcpp::Swap<8, big_endian>::readval(view); |
| 6989 | unsigned char sz = elfcpp::Swap<8, big_endian>::readval(view + 1); |
| 6990 | if (sz < 8) |
| 6991 | { |
| 6992 | gold_error(_("%s: Warning: bad `%s' option size %u smaller " |
| 6993 | "than its header"), |
| 6994 | this->name().c_str(), |
| 6995 | this->mips_elf_options_section_name(), sz); |
| 6996 | break; |
| 6997 | } |
| 6998 | |
| 6999 | if (this->is_n64() && kind == elfcpp::ODK_REGINFO) |
| 7000 | { |
| 7001 | // In the 64 bit ABI, an ODK_REGINFO option is the following |
| 7002 | // structure. The info field of the options header is not |
| 7003 | // used. |
| 7004 | // |
| 7005 | // typedef struct |
| 7006 | // { |
| 7007 | // // Mask of general purpose registers used. |
| 7008 | // unsigned char ri_gprmask[4]; |
| 7009 | // // Padding. |
| 7010 | // unsigned char ri_pad[4]; |
| 7011 | // // Mask of co-processor registers used. |
| 7012 | // unsigned char ri_cprmask[4][4]; |
| 7013 | // // GP register value for this object file. |
| 7014 | // unsigned char ri_gp_value[8]; |
| 7015 | // }; |
| 7016 | |
| 7017 | this->gp_ = elfcpp::Swap<size, big_endian>::readval(view |
| 7018 | + 32); |
| 7019 | } |
| 7020 | else if (kind == elfcpp::ODK_REGINFO) |
| 7021 | { |
| 7022 | // In the 32 bit ABI, an ODK_REGINFO option is the following |
| 7023 | // structure. The info field of the options header is not |
| 7024 | // used. The same structure is used in .reginfo section. |
| 7025 | // |
| 7026 | // typedef struct |
| 7027 | // { |
| 7028 | // unsigned char ri_gprmask[4]; |
| 7029 | // unsigned char ri_cprmask[4][4]; |
| 7030 | // unsigned char ri_gp_value[4]; |
| 7031 | // }; |
| 7032 | |
| 7033 | this->gp_ = elfcpp::Swap<size, big_endian>::readval(view |
| 7034 | + 28); |
| 7035 | } |
| 7036 | view += sz; |
| 7037 | } |
| 7038 | } |
| 7039 | |
| 7040 | const char* name = pnames + shdr.get_sh_name(); |
| 7041 | this->section_is_mips16_fn_stub_[i] = is_prefix_of(".mips16.fn", name); |
| 7042 | this->section_is_mips16_call_stub_[i] = |
| 7043 | is_prefix_of(".mips16.call.", name); |
| 7044 | this->section_is_mips16_call_fp_stub_[i] = |
| 7045 | is_prefix_of(".mips16.call.fp.", name); |
| 7046 | |
| 7047 | if (strcmp(name, ".pdr") == 0) |
| 7048 | { |
| 7049 | gold_assert(this->pdr_shndx_ == -1U); |
| 7050 | this->pdr_shndx_ = i; |
| 7051 | } |
| 7052 | } |
| 7053 | |
| 7054 | // This is rare. |
| 7055 | if (!must_merge_processor_specific_data) |
| 7056 | this->merge_processor_specific_data_ = false; |
| 7057 | } |
| 7058 | |
| 7059 | // Discard MIPS16 stub secions that are not needed. |
| 7060 | |
| 7061 | template<int size, bool big_endian> |
| 7062 | void |
| 7063 | Mips_relobj<size, big_endian>::discard_mips16_stub_sections(Symbol_table* symtab) |
| 7064 | { |
| 7065 | for (typename Mips16_stubs_int_map::const_iterator |
| 7066 | it = this->mips16_stub_sections_.begin(); |
| 7067 | it != this->mips16_stub_sections_.end(); ++it) |
| 7068 | { |
| 7069 | Mips16_stub_section<size, big_endian>* stub_section = it->second; |
| 7070 | if (!stub_section->is_target_found()) |
| 7071 | { |
| 7072 | gold_error(_("no relocation found in mips16 stub section '%s'"), |
| 7073 | stub_section->object() |
| 7074 | ->section_name(stub_section->shndx()).c_str()); |
| 7075 | } |
| 7076 | |
| 7077 | bool discard = false; |
| 7078 | if (stub_section->is_for_local_function()) |
| 7079 | { |
| 7080 | if (stub_section->is_fn_stub()) |
| 7081 | { |
| 7082 | // This stub is for a local symbol. This stub will only |
| 7083 | // be needed if there is some relocation in this object, |
| 7084 | // other than a 16 bit function call, which refers to this |
| 7085 | // symbol. |
| 7086 | if (!this->has_local_non_16bit_call_relocs(stub_section->r_sym())) |
| 7087 | discard = true; |
| 7088 | else |
| 7089 | this->add_local_mips16_fn_stub(stub_section); |
| 7090 | } |
| 7091 | else |
| 7092 | { |
| 7093 | // This stub is for a local symbol. This stub will only |
| 7094 | // be needed if there is some relocation (R_MIPS16_26) in |
| 7095 | // this object that refers to this symbol. |
| 7096 | gold_assert(stub_section->is_call_stub() |
| 7097 | || stub_section->is_call_fp_stub()); |
| 7098 | if (!this->has_local_16bit_call_relocs(stub_section->r_sym())) |
| 7099 | discard = true; |
| 7100 | else |
| 7101 | this->add_local_mips16_call_stub(stub_section); |
| 7102 | } |
| 7103 | } |
| 7104 | else |
| 7105 | { |
| 7106 | Mips_symbol<size>* gsym = stub_section->gsym(); |
| 7107 | if (stub_section->is_fn_stub()) |
| 7108 | { |
| 7109 | if (gsym->has_mips16_fn_stub()) |
| 7110 | // We already have a stub for this function. |
| 7111 | discard = true; |
| 7112 | else |
| 7113 | { |
| 7114 | gsym->set_mips16_fn_stub(stub_section); |
| 7115 | if (gsym->should_add_dynsym_entry(symtab)) |
| 7116 | { |
| 7117 | // If we have a MIPS16 function with a stub, the |
| 7118 | // dynamic symbol must refer to the stub, since only |
| 7119 | // the stub uses the standard calling conventions. |
| 7120 | gsym->set_need_fn_stub(); |
| 7121 | if (gsym->is_from_dynobj()) |
| 7122 | gsym->set_needs_dynsym_value(); |
| 7123 | } |
| 7124 | } |
| 7125 | if (!gsym->need_fn_stub()) |
| 7126 | discard = true; |
| 7127 | } |
| 7128 | else if (stub_section->is_call_stub()) |
| 7129 | { |
| 7130 | if (gsym->is_mips16()) |
| 7131 | // We don't need the call_stub; this is a 16 bit |
| 7132 | // function, so calls from other 16 bit functions are |
| 7133 | // OK. |
| 7134 | discard = true; |
| 7135 | else if (gsym->has_mips16_call_stub()) |
| 7136 | // We already have a stub for this function. |
| 7137 | discard = true; |
| 7138 | else |
| 7139 | gsym->set_mips16_call_stub(stub_section); |
| 7140 | } |
| 7141 | else |
| 7142 | { |
| 7143 | gold_assert(stub_section->is_call_fp_stub()); |
| 7144 | if (gsym->is_mips16()) |
| 7145 | // We don't need the call_stub; this is a 16 bit |
| 7146 | // function, so calls from other 16 bit functions are |
| 7147 | // OK. |
| 7148 | discard = true; |
| 7149 | else if (gsym->has_mips16_call_fp_stub()) |
| 7150 | // We already have a stub for this function. |
| 7151 | discard = true; |
| 7152 | else |
| 7153 | gsym->set_mips16_call_fp_stub(stub_section); |
| 7154 | } |
| 7155 | } |
| 7156 | if (discard) |
| 7157 | this->set_output_section(stub_section->shndx(), NULL); |
| 7158 | } |
| 7159 | } |
| 7160 | |
| 7161 | // Mips_output_data_la25_stub methods. |
| 7162 | |
| 7163 | // Template for standard LA25 stub. |
| 7164 | template<int size, bool big_endian> |
| 7165 | const uint32_t |
| 7166 | Mips_output_data_la25_stub<size, big_endian>::la25_stub_entry[] = |
| 7167 | { |
| 7168 | 0x3c190000, // lui $25,%hi(func) |
| 7169 | 0x08000000, // j func |
| 7170 | 0x27390000, // add $25,$25,%lo(func) |
| 7171 | 0x00000000 // nop |
| 7172 | }; |
| 7173 | |
| 7174 | // Template for microMIPS LA25 stub. |
| 7175 | template<int size, bool big_endian> |
| 7176 | const uint32_t |
| 7177 | Mips_output_data_la25_stub<size, big_endian>::la25_stub_micromips_entry[] = |
| 7178 | { |
| 7179 | 0x41b9, 0x0000, // lui t9,%hi(func) |
| 7180 | 0xd400, 0x0000, // j func |
| 7181 | 0x3339, 0x0000, // addiu t9,t9,%lo(func) |
| 7182 | 0x0000, 0x0000 // nop |
| 7183 | }; |
| 7184 | |
| 7185 | // Create la25 stub for a symbol. |
| 7186 | |
| 7187 | template<int size, bool big_endian> |
| 7188 | void |
| 7189 | Mips_output_data_la25_stub<size, big_endian>::create_la25_stub( |
| 7190 | Symbol_table* symtab, Target_mips<size, big_endian>* target, |
| 7191 | Mips_symbol<size>* gsym) |
| 7192 | { |
| 7193 | if (!gsym->has_la25_stub()) |
| 7194 | { |
| 7195 | gsym->set_la25_stub_offset(this->symbols_.size() * 16); |
| 7196 | this->symbols_.push_back(gsym); |
| 7197 | this->create_stub_symbol(gsym, symtab, target, 16); |
| 7198 | } |
| 7199 | } |
| 7200 | |
| 7201 | // Create a symbol for SYM stub's value and size, to help make the disassembly |
| 7202 | // easier to read. |
| 7203 | |
| 7204 | template<int size, bool big_endian> |
| 7205 | void |
| 7206 | Mips_output_data_la25_stub<size, big_endian>::create_stub_symbol( |
| 7207 | Mips_symbol<size>* sym, Symbol_table* symtab, |
| 7208 | Target_mips<size, big_endian>* target, uint64_t symsize) |
| 7209 | { |
| 7210 | std::string name(".pic."); |
| 7211 | name += sym->name(); |
| 7212 | |
| 7213 | unsigned int offset = sym->la25_stub_offset(); |
| 7214 | if (sym->is_micromips()) |
| 7215 | offset |= 1; |
| 7216 | |
| 7217 | // Make it a local function. |
| 7218 | Symbol* new_sym = symtab->define_in_output_data(name.c_str(), NULL, |
| 7219 | Symbol_table::PREDEFINED, |
| 7220 | target->la25_stub_section(), |
| 7221 | offset, symsize, elfcpp::STT_FUNC, |
| 7222 | elfcpp::STB_LOCAL, |
| 7223 | elfcpp::STV_DEFAULT, 0, |
| 7224 | false, false); |
| 7225 | new_sym->set_is_forced_local(); |
| 7226 | } |
| 7227 | |
| 7228 | // Write out la25 stubs. This uses the hand-coded instructions above, |
| 7229 | // and adjusts them as needed. |
| 7230 | |
| 7231 | template<int size, bool big_endian> |
| 7232 | void |
| 7233 | Mips_output_data_la25_stub<size, big_endian>::do_write(Output_file* of) |
| 7234 | { |
| 7235 | const off_t offset = this->offset(); |
| 7236 | const section_size_type oview_size = |
| 7237 | convert_to_section_size_type(this->data_size()); |
| 7238 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 7239 | |
| 7240 | for (typename std::vector<Mips_symbol<size>*>::iterator |
| 7241 | p = this->symbols_.begin(); |
| 7242 | p != this->symbols_.end(); |
| 7243 | ++p) |
| 7244 | { |
| 7245 | Mips_symbol<size>* sym = *p; |
| 7246 | unsigned char* pov = oview + sym->la25_stub_offset(); |
| 7247 | |
| 7248 | Mips_address target = sym->value(); |
| 7249 | if (!sym->is_micromips()) |
| 7250 | { |
| 7251 | elfcpp::Swap<32, big_endian>::writeval(pov, |
| 7252 | la25_stub_entry[0] | (((target + 0x8000) >> 16) & 0xffff)); |
| 7253 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, |
| 7254 | la25_stub_entry[1] | ((target >> 2) & 0x3ffffff)); |
| 7255 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, |
| 7256 | la25_stub_entry[2] | (target & 0xffff)); |
| 7257 | elfcpp::Swap<32, big_endian>::writeval(pov + 12, la25_stub_entry[3]); |
| 7258 | } |
| 7259 | else |
| 7260 | { |
| 7261 | target |= 1; |
| 7262 | // First stub instruction. Paste high 16-bits of the target. |
| 7263 | elfcpp::Swap<16, big_endian>::writeval(pov, |
| 7264 | la25_stub_micromips_entry[0]); |
| 7265 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, |
| 7266 | ((target + 0x8000) >> 16) & 0xffff); |
| 7267 | // Second stub instruction. Paste low 26-bits of the target, shifted |
| 7268 | // right by 1. |
| 7269 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, |
| 7270 | la25_stub_micromips_entry[2] | ((target >> 17) & 0x3ff)); |
| 7271 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, |
| 7272 | la25_stub_micromips_entry[3] | ((target >> 1) & 0xffff)); |
| 7273 | // Third stub instruction. Paste low 16-bits of the target. |
| 7274 | elfcpp::Swap<16, big_endian>::writeval(pov + 8, |
| 7275 | la25_stub_micromips_entry[4]); |
| 7276 | elfcpp::Swap<16, big_endian>::writeval(pov + 10, target & 0xffff); |
| 7277 | // Fourth stub instruction. |
| 7278 | elfcpp::Swap<16, big_endian>::writeval(pov + 12, |
| 7279 | la25_stub_micromips_entry[6]); |
| 7280 | elfcpp::Swap<16, big_endian>::writeval(pov + 14, |
| 7281 | la25_stub_micromips_entry[7]); |
| 7282 | } |
| 7283 | } |
| 7284 | |
| 7285 | of->write_output_view(offset, oview_size, oview); |
| 7286 | } |
| 7287 | |
| 7288 | // Mips_output_data_plt methods. |
| 7289 | |
| 7290 | // The format of the first PLT entry in an O32 executable. |
| 7291 | template<int size, bool big_endian> |
| 7292 | const uint32_t Mips_output_data_plt<size, big_endian>::plt0_entry_o32[] = |
| 7293 | { |
| 7294 | 0x3c1c0000, // lui $28, %hi(&GOTPLT[0]) |
| 7295 | 0x8f990000, // lw $25, %lo(&GOTPLT[0])($28) |
| 7296 | 0x279c0000, // addiu $28, $28, %lo(&GOTPLT[0]) |
| 7297 | 0x031cc023, // subu $24, $24, $28 |
| 7298 | 0x03e07825, // or $15, $31, zero |
| 7299 | 0x0018c082, // srl $24, $24, 2 |
| 7300 | 0x0320f809, // jalr $25 |
| 7301 | 0x2718fffe // subu $24, $24, 2 |
| 7302 | }; |
| 7303 | |
| 7304 | // The format of the first PLT entry in an N32 executable. Different |
| 7305 | // because gp ($28) is not available; we use t2 ($14) instead. |
| 7306 | template<int size, bool big_endian> |
| 7307 | const uint32_t Mips_output_data_plt<size, big_endian>::plt0_entry_n32[] = |
| 7308 | { |
| 7309 | 0x3c0e0000, // lui $14, %hi(&GOTPLT[0]) |
| 7310 | 0x8dd90000, // lw $25, %lo(&GOTPLT[0])($14) |
| 7311 | 0x25ce0000, // addiu $14, $14, %lo(&GOTPLT[0]) |
| 7312 | 0x030ec023, // subu $24, $24, $14 |
| 7313 | 0x03e07825, // or $15, $31, zero |
| 7314 | 0x0018c082, // srl $24, $24, 2 |
| 7315 | 0x0320f809, // jalr $25 |
| 7316 | 0x2718fffe // subu $24, $24, 2 |
| 7317 | }; |
| 7318 | |
| 7319 | // The format of the first PLT entry in an N64 executable. Different |
| 7320 | // from N32 because of the increased size of GOT entries. |
| 7321 | template<int size, bool big_endian> |
| 7322 | const uint32_t Mips_output_data_plt<size, big_endian>::plt0_entry_n64[] = |
| 7323 | { |
| 7324 | 0x3c0e0000, // lui $14, %hi(&GOTPLT[0]) |
| 7325 | 0xddd90000, // ld $25, %lo(&GOTPLT[0])($14) |
| 7326 | 0x25ce0000, // addiu $14, $14, %lo(&GOTPLT[0]) |
| 7327 | 0x030ec023, // subu $24, $24, $14 |
| 7328 | 0x03e07825, // or $15, $31, zero |
| 7329 | 0x0018c0c2, // srl $24, $24, 3 |
| 7330 | 0x0320f809, // jalr $25 |
| 7331 | 0x2718fffe // subu $24, $24, 2 |
| 7332 | }; |
| 7333 | |
| 7334 | // The format of the microMIPS first PLT entry in an O32 executable. |
| 7335 | // We rely on v0 ($2) rather than t8 ($24) to contain the address |
| 7336 | // of the GOTPLT entry handled, so this stub may only be used when |
| 7337 | // all the subsequent PLT entries are microMIPS code too. |
| 7338 | // |
| 7339 | // The trailing NOP is for alignment and correct disassembly only. |
| 7340 | template<int size, bool big_endian> |
| 7341 | const uint32_t Mips_output_data_plt<size, big_endian>:: |
| 7342 | plt0_entry_micromips_o32[] = |
| 7343 | { |
| 7344 | 0x7980, 0x0000, // addiupc $3, (&GOTPLT[0]) - . |
| 7345 | 0xff23, 0x0000, // lw $25, 0($3) |
| 7346 | 0x0535, // subu $2, $2, $3 |
| 7347 | 0x2525, // srl $2, $2, 2 |
| 7348 | 0x3302, 0xfffe, // subu $24, $2, 2 |
| 7349 | 0x0dff, // move $15, $31 |
| 7350 | 0x45f9, // jalrs $25 |
| 7351 | 0x0f83, // move $28, $3 |
| 7352 | 0x0c00 // nop |
| 7353 | }; |
| 7354 | |
| 7355 | // The format of the microMIPS first PLT entry in an O32 executable |
| 7356 | // in the insn32 mode. |
| 7357 | template<int size, bool big_endian> |
| 7358 | const uint32_t Mips_output_data_plt<size, big_endian>:: |
| 7359 | plt0_entry_micromips32_o32[] = |
| 7360 | { |
| 7361 | 0x41bc, 0x0000, // lui $28, %hi(&GOTPLT[0]) |
| 7362 | 0xff3c, 0x0000, // lw $25, %lo(&GOTPLT[0])($28) |
| 7363 | 0x339c, 0x0000, // addiu $28, $28, %lo(&GOTPLT[0]) |
| 7364 | 0x0398, 0xc1d0, // subu $24, $24, $28 |
| 7365 | 0x001f, 0x7a90, // or $15, $31, zero |
| 7366 | 0x0318, 0x1040, // srl $24, $24, 2 |
| 7367 | 0x03f9, 0x0f3c, // jalr $25 |
| 7368 | 0x3318, 0xfffe // subu $24, $24, 2 |
| 7369 | }; |
| 7370 | |
| 7371 | // The format of subsequent standard entries in the PLT. |
| 7372 | template<int size, bool big_endian> |
| 7373 | const uint32_t Mips_output_data_plt<size, big_endian>::plt_entry[] = |
| 7374 | { |
| 7375 | 0x3c0f0000, // lui $15, %hi(.got.plt entry) |
| 7376 | 0x01f90000, // l[wd] $25, %lo(.got.plt entry)($15) |
| 7377 | 0x03200008, // jr $25 |
| 7378 | 0x25f80000 // addiu $24, $15, %lo(.got.plt entry) |
| 7379 | }; |
| 7380 | |
| 7381 | // The format of subsequent R6 PLT entries. |
| 7382 | template<int size, bool big_endian> |
| 7383 | const uint32_t Mips_output_data_plt<size, big_endian>::plt_entry_r6[] = |
| 7384 | { |
| 7385 | 0x3c0f0000, // lui $15, %hi(.got.plt entry) |
| 7386 | 0x01f90000, // l[wd] $25, %lo(.got.plt entry)($15) |
| 7387 | 0x03200009, // jr $25 |
| 7388 | 0x25f80000 // addiu $24, $15, %lo(.got.plt entry) |
| 7389 | }; |
| 7390 | |
| 7391 | // The format of subsequent MIPS16 o32 PLT entries. We use v1 ($3) as a |
| 7392 | // temporary because t8 ($24) and t9 ($25) are not directly addressable. |
| 7393 | // Note that this differs from the GNU ld which uses both v0 ($2) and v1 ($3). |
| 7394 | // We cannot use v0 because MIPS16 call stubs from the CS toolchain expect |
| 7395 | // target function address in register v0. |
| 7396 | template<int size, bool big_endian> |
| 7397 | const uint32_t Mips_output_data_plt<size, big_endian>::plt_entry_mips16_o32[] = |
| 7398 | { |
| 7399 | 0xb303, // lw $3, 12($pc) |
| 7400 | 0x651b, // move $24, $3 |
| 7401 | 0x9b60, // lw $3, 0($3) |
| 7402 | 0xeb00, // jr $3 |
| 7403 | 0x653b, // move $25, $3 |
| 7404 | 0x6500, // nop |
| 7405 | 0x0000, 0x0000 // .word (.got.plt entry) |
| 7406 | }; |
| 7407 | |
| 7408 | // The format of subsequent microMIPS o32 PLT entries. We use v0 ($2) |
| 7409 | // as a temporary because t8 ($24) is not addressable with ADDIUPC. |
| 7410 | template<int size, bool big_endian> |
| 7411 | const uint32_t Mips_output_data_plt<size, big_endian>:: |
| 7412 | plt_entry_micromips_o32[] = |
| 7413 | { |
| 7414 | 0x7900, 0x0000, // addiupc $2, (.got.plt entry) - . |
| 7415 | 0xff22, 0x0000, // lw $25, 0($2) |
| 7416 | 0x4599, // jr $25 |
| 7417 | 0x0f02 // move $24, $2 |
| 7418 | }; |
| 7419 | |
| 7420 | // The format of subsequent microMIPS o32 PLT entries in the insn32 mode. |
| 7421 | template<int size, bool big_endian> |
| 7422 | const uint32_t Mips_output_data_plt<size, big_endian>:: |
| 7423 | plt_entry_micromips32_o32[] = |
| 7424 | { |
| 7425 | 0x41af, 0x0000, // lui $15, %hi(.got.plt entry) |
| 7426 | 0xff2f, 0x0000, // lw $25, %lo(.got.plt entry)($15) |
| 7427 | 0x0019, 0x0f3c, // jr $25 |
| 7428 | 0x330f, 0x0000 // addiu $24, $15, %lo(.got.plt entry) |
| 7429 | }; |
| 7430 | |
| 7431 | // Add an entry to the PLT for a symbol referenced by r_type relocation. |
| 7432 | |
| 7433 | template<int size, bool big_endian> |
| 7434 | void |
| 7435 | Mips_output_data_plt<size, big_endian>::add_entry(Mips_symbol<size>* gsym, |
| 7436 | unsigned int r_type) |
| 7437 | { |
| 7438 | gold_assert(!gsym->has_plt_offset()); |
| 7439 | |
| 7440 | // Final PLT offset for a symbol will be set in method set_plt_offsets(). |
| 7441 | gsym->set_plt_offset(this->entry_count() * sizeof(plt_entry) |
| 7442 | + sizeof(plt0_entry_o32)); |
| 7443 | this->symbols_.push_back(gsym); |
| 7444 | |
| 7445 | // Record whether the relocation requires a standard MIPS |
| 7446 | // or a compressed code entry. |
| 7447 | if (jal_reloc(r_type)) |
| 7448 | { |
| 7449 | if (r_type == elfcpp::R_MIPS_26) |
| 7450 | gsym->set_needs_mips_plt(true); |
| 7451 | else |
| 7452 | gsym->set_needs_comp_plt(true); |
| 7453 | } |
| 7454 | |
| 7455 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
| 7456 | |
| 7457 | // Every PLT entry needs a GOT entry which points back to the PLT |
| 7458 | // entry (this will be changed by the dynamic linker, normally |
| 7459 | // lazily when the function is called). |
| 7460 | this->got_plt_->set_current_data_size(got_offset + size/8); |
| 7461 | |
| 7462 | gsym->set_needs_dynsym_entry(); |
| 7463 | this->rel_->add_global(gsym, elfcpp::R_MIPS_JUMP_SLOT, this->got_plt_, |
| 7464 | got_offset); |
| 7465 | } |
| 7466 | |
| 7467 | // Set final PLT offsets. For each symbol, determine whether standard or |
| 7468 | // compressed (MIPS16 or microMIPS) PLT entry is used. |
| 7469 | |
| 7470 | template<int size, bool big_endian> |
| 7471 | void |
| 7472 | Mips_output_data_plt<size, big_endian>::set_plt_offsets() |
| 7473 | { |
| 7474 | // The sizes of individual PLT entries. |
| 7475 | unsigned int plt_mips_entry_size = this->standard_plt_entry_size(); |
| 7476 | unsigned int plt_comp_entry_size = (!this->target_->is_output_newabi() |
| 7477 | ? this->compressed_plt_entry_size() : 0); |
| 7478 | |
| 7479 | for (typename std::vector<Mips_symbol<size>*>::const_iterator |
| 7480 | p = this->symbols_.begin(); p != this->symbols_.end(); ++p) |
| 7481 | { |
| 7482 | Mips_symbol<size>* mips_sym = *p; |
| 7483 | |
| 7484 | // There are no defined MIPS16 or microMIPS PLT entries for n32 or n64, |
| 7485 | // so always use a standard entry there. |
| 7486 | // |
| 7487 | // If the symbol has a MIPS16 call stub and gets a PLT entry, then |
| 7488 | // all MIPS16 calls will go via that stub, and there is no benefit |
| 7489 | // to having a MIPS16 entry. And in the case of call_stub a |
| 7490 | // standard entry actually has to be used as the stub ends with a J |
| 7491 | // instruction. |
| 7492 | if (this->target_->is_output_newabi() |
| 7493 | || mips_sym->has_mips16_call_stub() |
| 7494 | || mips_sym->has_mips16_call_fp_stub()) |
| 7495 | { |
| 7496 | mips_sym->set_needs_mips_plt(true); |
| 7497 | mips_sym->set_needs_comp_plt(false); |
| 7498 | } |
| 7499 | |
| 7500 | // Otherwise, if there are no direct calls to the function, we |
| 7501 | // have a free choice of whether to use standard or compressed |
| 7502 | // entries. Prefer microMIPS entries if the object is known to |
| 7503 | // contain microMIPS code, so that it becomes possible to create |
| 7504 | // pure microMIPS binaries. Prefer standard entries otherwise, |
| 7505 | // because MIPS16 ones are no smaller and are usually slower. |
| 7506 | if (!mips_sym->needs_mips_plt() && !mips_sym->needs_comp_plt()) |
| 7507 | { |
| 7508 | if (this->target_->is_output_micromips()) |
| 7509 | mips_sym->set_needs_comp_plt(true); |
| 7510 | else |
| 7511 | mips_sym->set_needs_mips_plt(true); |
| 7512 | } |
| 7513 | |
| 7514 | if (mips_sym->needs_mips_plt()) |
| 7515 | { |
| 7516 | mips_sym->set_mips_plt_offset(this->plt_mips_offset_); |
| 7517 | this->plt_mips_offset_ += plt_mips_entry_size; |
| 7518 | } |
| 7519 | if (mips_sym->needs_comp_plt()) |
| 7520 | { |
| 7521 | mips_sym->set_comp_plt_offset(this->plt_comp_offset_); |
| 7522 | this->plt_comp_offset_ += plt_comp_entry_size; |
| 7523 | } |
| 7524 | } |
| 7525 | |
| 7526 | // Figure out the size of the PLT header if we know that we are using it. |
| 7527 | if (this->plt_mips_offset_ + this->plt_comp_offset_ != 0) |
| 7528 | this->plt_header_size_ = this->get_plt_header_size(); |
| 7529 | } |
| 7530 | |
| 7531 | // Write out the PLT. This uses the hand-coded instructions above, |
| 7532 | // and adjusts them as needed. |
| 7533 | |
| 7534 | template<int size, bool big_endian> |
| 7535 | void |
| 7536 | Mips_output_data_plt<size, big_endian>::do_write(Output_file* of) |
| 7537 | { |
| 7538 | const off_t offset = this->offset(); |
| 7539 | const section_size_type oview_size = |
| 7540 | convert_to_section_size_type(this->data_size()); |
| 7541 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 7542 | |
| 7543 | const off_t gotplt_file_offset = this->got_plt_->offset(); |
| 7544 | const section_size_type gotplt_size = |
| 7545 | convert_to_section_size_type(this->got_plt_->data_size()); |
| 7546 | unsigned char* const gotplt_view = of->get_output_view(gotplt_file_offset, |
| 7547 | gotplt_size); |
| 7548 | unsigned char* pov = oview; |
| 7549 | |
| 7550 | Mips_address plt_address = this->address(); |
| 7551 | |
| 7552 | // Calculate the address of .got.plt. |
| 7553 | Mips_address gotplt_addr = this->got_plt_->address(); |
| 7554 | Mips_address gotplt_addr_high = ((gotplt_addr + 0x8000) >> 16) & 0xffff; |
| 7555 | Mips_address gotplt_addr_low = gotplt_addr & 0xffff; |
| 7556 | |
| 7557 | // The PLT sequence is not safe for N64 if .got.plt's address can |
| 7558 | // not be loaded in two instructions. |
| 7559 | gold_assert((gotplt_addr & ~(Mips_address) 0x7fffffff) == 0 |
| 7560 | || ~(gotplt_addr | 0x7fffffff) == 0); |
| 7561 | |
| 7562 | // Write the PLT header. |
| 7563 | const uint32_t* plt0_entry = this->get_plt_header_entry(); |
| 7564 | if (plt0_entry == plt0_entry_micromips_o32) |
| 7565 | { |
| 7566 | // Write microMIPS PLT header. |
| 7567 | gold_assert(gotplt_addr % 4 == 0); |
| 7568 | |
| 7569 | Mips_address gotpc_offset = gotplt_addr - ((plt_address | 3) ^ 3); |
| 7570 | |
| 7571 | // ADDIUPC has a span of +/-16MB, check we're in range. |
| 7572 | if (gotpc_offset + 0x1000000 >= 0x2000000) |
| 7573 | { |
| 7574 | gold_error(_(".got.plt offset of %ld from .plt beyond the range of " |
| 7575 | "ADDIUPC"), (long)gotpc_offset); |
| 7576 | return; |
| 7577 | } |
| 7578 | |
| 7579 | elfcpp::Swap<16, big_endian>::writeval(pov, |
| 7580 | plt0_entry[0] | ((gotpc_offset >> 18) & 0x7f)); |
| 7581 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, |
| 7582 | (gotpc_offset >> 2) & 0xffff); |
| 7583 | pov += 4; |
| 7584 | for (unsigned int i = 2; |
| 7585 | i < (sizeof(plt0_entry_micromips_o32) |
| 7586 | / sizeof(plt0_entry_micromips_o32[0])); |
| 7587 | i++) |
| 7588 | { |
| 7589 | elfcpp::Swap<16, big_endian>::writeval(pov, plt0_entry[i]); |
| 7590 | pov += 2; |
| 7591 | } |
| 7592 | } |
| 7593 | else if (plt0_entry == plt0_entry_micromips32_o32) |
| 7594 | { |
| 7595 | // Write microMIPS PLT header in insn32 mode. |
| 7596 | elfcpp::Swap<16, big_endian>::writeval(pov, plt0_entry[0]); |
| 7597 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, gotplt_addr_high); |
| 7598 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, plt0_entry[2]); |
| 7599 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, gotplt_addr_low); |
| 7600 | elfcpp::Swap<16, big_endian>::writeval(pov + 8, plt0_entry[4]); |
| 7601 | elfcpp::Swap<16, big_endian>::writeval(pov + 10, gotplt_addr_low); |
| 7602 | pov += 12; |
| 7603 | for (unsigned int i = 6; |
| 7604 | i < (sizeof(plt0_entry_micromips32_o32) |
| 7605 | / sizeof(plt0_entry_micromips32_o32[0])); |
| 7606 | i++) |
| 7607 | { |
| 7608 | elfcpp::Swap<16, big_endian>::writeval(pov, plt0_entry[i]); |
| 7609 | pov += 2; |
| 7610 | } |
| 7611 | } |
| 7612 | else |
| 7613 | { |
| 7614 | // Write standard PLT header. |
| 7615 | elfcpp::Swap<32, big_endian>::writeval(pov, |
| 7616 | plt0_entry[0] | gotplt_addr_high); |
| 7617 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, |
| 7618 | plt0_entry[1] | gotplt_addr_low); |
| 7619 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, |
| 7620 | plt0_entry[2] | gotplt_addr_low); |
| 7621 | pov += 12; |
| 7622 | for (int i = 3; i < 8; i++) |
| 7623 | { |
| 7624 | elfcpp::Swap<32, big_endian>::writeval(pov, plt0_entry[i]); |
| 7625 | pov += 4; |
| 7626 | } |
| 7627 | } |
| 7628 | |
| 7629 | |
| 7630 | unsigned char* gotplt_pov = gotplt_view; |
| 7631 | unsigned int got_entry_size = size/8; // TODO(sasa): MIPS_ELF_GOT_SIZE |
| 7632 | |
| 7633 | // The first two entries in .got.plt are reserved. |
| 7634 | elfcpp::Swap<size, big_endian>::writeval(gotplt_pov, 0); |
| 7635 | elfcpp::Swap<size, big_endian>::writeval(gotplt_pov + got_entry_size, 0); |
| 7636 | |
| 7637 | unsigned int gotplt_offset = 2 * got_entry_size; |
| 7638 | gotplt_pov += 2 * got_entry_size; |
| 7639 | |
| 7640 | // Calculate the address of the PLT header. |
| 7641 | Mips_address header_address = (plt_address |
| 7642 | + (this->is_plt_header_compressed() ? 1 : 0)); |
| 7643 | |
| 7644 | // Initialize compressed PLT area view. |
| 7645 | unsigned char* pov2 = pov + this->plt_mips_offset_; |
| 7646 | |
| 7647 | // Write the PLT entries. |
| 7648 | for (typename std::vector<Mips_symbol<size>*>::const_iterator |
| 7649 | p = this->symbols_.begin(); |
| 7650 | p != this->symbols_.end(); |
| 7651 | ++p, gotplt_pov += got_entry_size, gotplt_offset += got_entry_size) |
| 7652 | { |
| 7653 | Mips_symbol<size>* mips_sym = *p; |
| 7654 | |
| 7655 | // Calculate the address of the .got.plt entry. |
| 7656 | uint32_t gotplt_entry_addr = (gotplt_addr + gotplt_offset); |
| 7657 | uint32_t gotplt_entry_addr_hi = (((gotplt_entry_addr + 0x8000) >> 16) |
| 7658 | & 0xffff); |
| 7659 | uint32_t gotplt_entry_addr_lo = gotplt_entry_addr & 0xffff; |
| 7660 | |
| 7661 | // Initially point the .got.plt entry at the PLT header. |
| 7662 | if (this->target_->is_output_n64()) |
| 7663 | elfcpp::Swap<64, big_endian>::writeval(gotplt_pov, header_address); |
| 7664 | else |
| 7665 | elfcpp::Swap<32, big_endian>::writeval(gotplt_pov, header_address); |
| 7666 | |
| 7667 | // Now handle the PLT itself. First the standard entry. |
| 7668 | if (mips_sym->has_mips_plt_offset()) |
| 7669 | { |
| 7670 | // Pick the load opcode (LW or LD). |
| 7671 | uint64_t load = this->target_->is_output_n64() ? 0xdc000000 |
| 7672 | : 0x8c000000; |
| 7673 | |
| 7674 | const uint32_t* entry = this->target_->is_output_r6() ? plt_entry_r6 |
| 7675 | : plt_entry; |
| 7676 | |
| 7677 | // Fill in the PLT entry itself. |
| 7678 | elfcpp::Swap<32, big_endian>::writeval(pov, |
| 7679 | entry[0] | gotplt_entry_addr_hi); |
| 7680 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, |
| 7681 | entry[1] | gotplt_entry_addr_lo | load); |
| 7682 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, entry[2]); |
| 7683 | elfcpp::Swap<32, big_endian>::writeval(pov + 12, |
| 7684 | entry[3] | gotplt_entry_addr_lo); |
| 7685 | pov += 16; |
| 7686 | } |
| 7687 | |
| 7688 | // Now the compressed entry. They come after any standard ones. |
| 7689 | if (mips_sym->has_comp_plt_offset()) |
| 7690 | { |
| 7691 | if (!this->target_->is_output_micromips()) |
| 7692 | { |
| 7693 | // Write MIPS16 PLT entry. |
| 7694 | const uint32_t* plt_entry = plt_entry_mips16_o32; |
| 7695 | |
| 7696 | elfcpp::Swap<16, big_endian>::writeval(pov2, plt_entry[0]); |
| 7697 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 2, plt_entry[1]); |
| 7698 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 4, plt_entry[2]); |
| 7699 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 6, plt_entry[3]); |
| 7700 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 8, plt_entry[4]); |
| 7701 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 10, plt_entry[5]); |
| 7702 | elfcpp::Swap<32, big_endian>::writeval(pov2 + 12, |
| 7703 | gotplt_entry_addr); |
| 7704 | pov2 += 16; |
| 7705 | } |
| 7706 | else if (this->target_->use_32bit_micromips_instructions()) |
| 7707 | { |
| 7708 | // Write microMIPS PLT entry in insn32 mode. |
| 7709 | const uint32_t* plt_entry = plt_entry_micromips32_o32; |
| 7710 | |
| 7711 | elfcpp::Swap<16, big_endian>::writeval(pov2, plt_entry[0]); |
| 7712 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 2, |
| 7713 | gotplt_entry_addr_hi); |
| 7714 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 4, plt_entry[2]); |
| 7715 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 6, |
| 7716 | gotplt_entry_addr_lo); |
| 7717 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 8, plt_entry[4]); |
| 7718 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 10, plt_entry[5]); |
| 7719 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 12, plt_entry[6]); |
| 7720 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 14, |
| 7721 | gotplt_entry_addr_lo); |
| 7722 | pov2 += 16; |
| 7723 | } |
| 7724 | else |
| 7725 | { |
| 7726 | // Write microMIPS PLT entry. |
| 7727 | const uint32_t* plt_entry = plt_entry_micromips_o32; |
| 7728 | |
| 7729 | gold_assert(gotplt_entry_addr % 4 == 0); |
| 7730 | |
| 7731 | Mips_address loc_address = plt_address + pov2 - oview; |
| 7732 | int gotpc_offset = gotplt_entry_addr - ((loc_address | 3) ^ 3); |
| 7733 | |
| 7734 | // ADDIUPC has a span of +/-16MB, check we're in range. |
| 7735 | if (gotpc_offset + 0x1000000 >= 0x2000000) |
| 7736 | { |
| 7737 | gold_error(_(".got.plt offset of %ld from .plt beyond the " |
| 7738 | "range of ADDIUPC"), (long)gotpc_offset); |
| 7739 | return; |
| 7740 | } |
| 7741 | |
| 7742 | elfcpp::Swap<16, big_endian>::writeval(pov2, |
| 7743 | plt_entry[0] | ((gotpc_offset >> 18) & 0x7f)); |
| 7744 | elfcpp::Swap<16, big_endian>::writeval( |
| 7745 | pov2 + 2, (gotpc_offset >> 2) & 0xffff); |
| 7746 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 4, plt_entry[2]); |
| 7747 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 6, plt_entry[3]); |
| 7748 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 8, plt_entry[4]); |
| 7749 | elfcpp::Swap<16, big_endian>::writeval(pov2 + 10, plt_entry[5]); |
| 7750 | pov2 += 12; |
| 7751 | } |
| 7752 | } |
| 7753 | } |
| 7754 | |
| 7755 | // Check the number of bytes written for standard entries. |
| 7756 | gold_assert(static_cast<section_size_type>( |
| 7757 | pov - oview - this->plt_header_size_) == this->plt_mips_offset_); |
| 7758 | // Check the number of bytes written for compressed entries. |
| 7759 | gold_assert((static_cast<section_size_type>(pov2 - pov) |
| 7760 | == this->plt_comp_offset_)); |
| 7761 | // Check the total number of bytes written. |
| 7762 | gold_assert(static_cast<section_size_type>(pov2 - oview) == oview_size); |
| 7763 | |
| 7764 | gold_assert(static_cast<section_size_type>(gotplt_pov - gotplt_view) |
| 7765 | == gotplt_size); |
| 7766 | |
| 7767 | of->write_output_view(offset, oview_size, oview); |
| 7768 | of->write_output_view(gotplt_file_offset, gotplt_size, gotplt_view); |
| 7769 | } |
| 7770 | |
| 7771 | // Mips_output_data_mips_stubs methods. |
| 7772 | |
| 7773 | // The format of the lazy binding stub when dynamic symbol count is less than |
| 7774 | // 64K, dynamic symbol index is less than 32K, and ABI is not N64. |
| 7775 | template<int size, bool big_endian> |
| 7776 | const uint32_t |
| 7777 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_1[4] = |
| 7778 | { |
| 7779 | 0x8f998010, // lw t9,0x8010(gp) |
| 7780 | 0x03e07825, // or t7,ra,zero |
| 7781 | 0x0320f809, // jalr t9,ra |
| 7782 | 0x24180000 // addiu t8,zero,DYN_INDEX sign extended |
| 7783 | }; |
| 7784 | |
| 7785 | // The format of the lazy binding stub when dynamic symbol count is less than |
| 7786 | // 64K, dynamic symbol index is less than 32K, and ABI is N64. |
| 7787 | template<int size, bool big_endian> |
| 7788 | const uint32_t |
| 7789 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_1_n64[4] = |
| 7790 | { |
| 7791 | 0xdf998010, // ld t9,0x8010(gp) |
| 7792 | 0x03e07825, // or t7,ra,zero |
| 7793 | 0x0320f809, // jalr t9,ra |
| 7794 | 0x64180000 // daddiu t8,zero,DYN_INDEX sign extended |
| 7795 | }; |
| 7796 | |
| 7797 | // The format of the lazy binding stub when dynamic symbol count is less than |
| 7798 | // 64K, dynamic symbol index is between 32K and 64K, and ABI is not N64. |
| 7799 | template<int size, bool big_endian> |
| 7800 | const uint32_t |
| 7801 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_2[4] = |
| 7802 | { |
| 7803 | 0x8f998010, // lw t9,0x8010(gp) |
| 7804 | 0x03e07825, // or t7,ra,zero |
| 7805 | 0x0320f809, // jalr t9,ra |
| 7806 | 0x34180000 // ori t8,zero,DYN_INDEX unsigned |
| 7807 | }; |
| 7808 | |
| 7809 | // The format of the lazy binding stub when dynamic symbol count is less than |
| 7810 | // 64K, dynamic symbol index is between 32K and 64K, and ABI is N64. |
| 7811 | template<int size, bool big_endian> |
| 7812 | const uint32_t |
| 7813 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_normal_2_n64[4] = |
| 7814 | { |
| 7815 | 0xdf998010, // ld t9,0x8010(gp) |
| 7816 | 0x03e07825, // or t7,ra,zero |
| 7817 | 0x0320f809, // jalr t9,ra |
| 7818 | 0x34180000 // ori t8,zero,DYN_INDEX unsigned |
| 7819 | }; |
| 7820 | |
| 7821 | // The format of the lazy binding stub when dynamic symbol count is greater than |
| 7822 | // 64K, and ABI is not N64. |
| 7823 | template<int size, bool big_endian> |
| 7824 | const uint32_t Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_big[5] = |
| 7825 | { |
| 7826 | 0x8f998010, // lw t9,0x8010(gp) |
| 7827 | 0x03e07825, // or t7,ra,zero |
| 7828 | 0x3c180000, // lui t8,DYN_INDEX |
| 7829 | 0x0320f809, // jalr t9,ra |
| 7830 | 0x37180000 // ori t8,t8,DYN_INDEX |
| 7831 | }; |
| 7832 | |
| 7833 | // The format of the lazy binding stub when dynamic symbol count is greater than |
| 7834 | // 64K, and ABI is N64. |
| 7835 | template<int size, bool big_endian> |
| 7836 | const uint32_t |
| 7837 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_big_n64[5] = |
| 7838 | { |
| 7839 | 0xdf998010, // ld t9,0x8010(gp) |
| 7840 | 0x03e07825, // or t7,ra,zero |
| 7841 | 0x3c180000, // lui t8,DYN_INDEX |
| 7842 | 0x0320f809, // jalr t9,ra |
| 7843 | 0x37180000 // ori t8,t8,DYN_INDEX |
| 7844 | }; |
| 7845 | |
| 7846 | // microMIPS stubs. |
| 7847 | |
| 7848 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7849 | // less than 64K, dynamic symbol index is less than 32K, and ABI is not N64. |
| 7850 | template<int size, bool big_endian> |
| 7851 | const uint32_t |
| 7852 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_normal_1[] = |
| 7853 | { |
| 7854 | 0xff3c, 0x8010, // lw t9,0x8010(gp) |
| 7855 | 0x0dff, // move t7,ra |
| 7856 | 0x45d9, // jalr t9 |
| 7857 | 0x3300, 0x0000 // addiu t8,zero,DYN_INDEX sign extended |
| 7858 | }; |
| 7859 | |
| 7860 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7861 | // less than 64K, dynamic symbol index is less than 32K, and ABI is N64. |
| 7862 | template<int size, bool big_endian> |
| 7863 | const uint32_t |
| 7864 | Mips_output_data_mips_stubs<size, big_endian>:: |
| 7865 | lazy_stub_micromips_normal_1_n64[] = |
| 7866 | { |
| 7867 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) |
| 7868 | 0x0dff, // move t7,ra |
| 7869 | 0x45d9, // jalr t9 |
| 7870 | 0x5f00, 0x0000 // daddiu t8,zero,DYN_INDEX sign extended |
| 7871 | }; |
| 7872 | |
| 7873 | // The format of the microMIPS lazy binding stub when dynamic symbol |
| 7874 | // count is less than 64K, dynamic symbol index is between 32K and 64K, |
| 7875 | // and ABI is not N64. |
| 7876 | template<int size, bool big_endian> |
| 7877 | const uint32_t |
| 7878 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_normal_2[] = |
| 7879 | { |
| 7880 | 0xff3c, 0x8010, // lw t9,0x8010(gp) |
| 7881 | 0x0dff, // move t7,ra |
| 7882 | 0x45d9, // jalr t9 |
| 7883 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned |
| 7884 | }; |
| 7885 | |
| 7886 | // The format of the microMIPS lazy binding stub when dynamic symbol |
| 7887 | // count is less than 64K, dynamic symbol index is between 32K and 64K, |
| 7888 | // and ABI is N64. |
| 7889 | template<int size, bool big_endian> |
| 7890 | const uint32_t |
| 7891 | Mips_output_data_mips_stubs<size, big_endian>:: |
| 7892 | lazy_stub_micromips_normal_2_n64[] = |
| 7893 | { |
| 7894 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) |
| 7895 | 0x0dff, // move t7,ra |
| 7896 | 0x45d9, // jalr t9 |
| 7897 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned |
| 7898 | }; |
| 7899 | |
| 7900 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7901 | // greater than 64K, and ABI is not N64. |
| 7902 | template<int size, bool big_endian> |
| 7903 | const uint32_t |
| 7904 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_big[] = |
| 7905 | { |
| 7906 | 0xff3c, 0x8010, // lw t9,0x8010(gp) |
| 7907 | 0x0dff, // move t7,ra |
| 7908 | 0x41b8, 0x0000, // lui t8,DYN_INDEX |
| 7909 | 0x45d9, // jalr t9 |
| 7910 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX |
| 7911 | }; |
| 7912 | |
| 7913 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7914 | // greater than 64K, and ABI is N64. |
| 7915 | template<int size, bool big_endian> |
| 7916 | const uint32_t |
| 7917 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips_big_n64[] = |
| 7918 | { |
| 7919 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) |
| 7920 | 0x0dff, // move t7,ra |
| 7921 | 0x41b8, 0x0000, // lui t8,DYN_INDEX |
| 7922 | 0x45d9, // jalr t9 |
| 7923 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX |
| 7924 | }; |
| 7925 | |
| 7926 | // 32-bit microMIPS stubs. |
| 7927 | |
| 7928 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7929 | // less than 64K, dynamic symbol index is less than 32K, ABI is not N64, and we |
| 7930 | // can use only 32-bit instructions. |
| 7931 | template<int size, bool big_endian> |
| 7932 | const uint32_t |
| 7933 | Mips_output_data_mips_stubs<size, big_endian>:: |
| 7934 | lazy_stub_micromips32_normal_1[] = |
| 7935 | { |
| 7936 | 0xff3c, 0x8010, // lw t9,0x8010(gp) |
| 7937 | 0x001f, 0x7a90, // or t7,ra,zero |
| 7938 | 0x03f9, 0x0f3c, // jalr ra,t9 |
| 7939 | 0x3300, 0x0000 // addiu t8,zero,DYN_INDEX sign extended |
| 7940 | }; |
| 7941 | |
| 7942 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7943 | // less than 64K, dynamic symbol index is less than 32K, ABI is N64, and we can |
| 7944 | // use only 32-bit instructions. |
| 7945 | template<int size, bool big_endian> |
| 7946 | const uint32_t |
| 7947 | Mips_output_data_mips_stubs<size, big_endian>:: |
| 7948 | lazy_stub_micromips32_normal_1_n64[] = |
| 7949 | { |
| 7950 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) |
| 7951 | 0x001f, 0x7a90, // or t7,ra,zero |
| 7952 | 0x03f9, 0x0f3c, // jalr ra,t9 |
| 7953 | 0x5f00, 0x0000 // daddiu t8,zero,DYN_INDEX sign extended |
| 7954 | }; |
| 7955 | |
| 7956 | // The format of the microMIPS lazy binding stub when dynamic symbol |
| 7957 | // count is less than 64K, dynamic symbol index is between 32K and 64K, |
| 7958 | // ABI is not N64, and we can use only 32-bit instructions. |
| 7959 | template<int size, bool big_endian> |
| 7960 | const uint32_t |
| 7961 | Mips_output_data_mips_stubs<size, big_endian>:: |
| 7962 | lazy_stub_micromips32_normal_2[] = |
| 7963 | { |
| 7964 | 0xff3c, 0x8010, // lw t9,0x8010(gp) |
| 7965 | 0x001f, 0x7a90, // or t7,ra,zero |
| 7966 | 0x03f9, 0x0f3c, // jalr ra,t9 |
| 7967 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned |
| 7968 | }; |
| 7969 | |
| 7970 | // The format of the microMIPS lazy binding stub when dynamic symbol |
| 7971 | // count is less than 64K, dynamic symbol index is between 32K and 64K, |
| 7972 | // ABI is N64, and we can use only 32-bit instructions. |
| 7973 | template<int size, bool big_endian> |
| 7974 | const uint32_t |
| 7975 | Mips_output_data_mips_stubs<size, big_endian>:: |
| 7976 | lazy_stub_micromips32_normal_2_n64[] = |
| 7977 | { |
| 7978 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) |
| 7979 | 0x001f, 0x7a90, // or t7,ra,zero |
| 7980 | 0x03f9, 0x0f3c, // jalr ra,t9 |
| 7981 | 0x5300, 0x0000 // ori t8,zero,DYN_INDEX unsigned |
| 7982 | }; |
| 7983 | |
| 7984 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7985 | // greater than 64K, ABI is not N64, and we can use only 32-bit instructions. |
| 7986 | template<int size, bool big_endian> |
| 7987 | const uint32_t |
| 7988 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips32_big[] = |
| 7989 | { |
| 7990 | 0xff3c, 0x8010, // lw t9,0x8010(gp) |
| 7991 | 0x001f, 0x7a90, // or t7,ra,zero |
| 7992 | 0x41b8, 0x0000, // lui t8,DYN_INDEX |
| 7993 | 0x03f9, 0x0f3c, // jalr ra,t9 |
| 7994 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX |
| 7995 | }; |
| 7996 | |
| 7997 | // The format of the microMIPS lazy binding stub when dynamic symbol count is |
| 7998 | // greater than 64K, ABI is N64, and we can use only 32-bit instructions. |
| 7999 | template<int size, bool big_endian> |
| 8000 | const uint32_t |
| 8001 | Mips_output_data_mips_stubs<size, big_endian>::lazy_stub_micromips32_big_n64[] = |
| 8002 | { |
| 8003 | 0xdf3c, 0x8010, // ld t9,0x8010(gp) |
| 8004 | 0x001f, 0x7a90, // or t7,ra,zero |
| 8005 | 0x41b8, 0x0000, // lui t8,DYN_INDEX |
| 8006 | 0x03f9, 0x0f3c, // jalr ra,t9 |
| 8007 | 0x5318, 0x0000 // ori t8,t8,DYN_INDEX |
| 8008 | }; |
| 8009 | |
| 8010 | // Create entry for a symbol. |
| 8011 | |
| 8012 | template<int size, bool big_endian> |
| 8013 | void |
| 8014 | Mips_output_data_mips_stubs<size, big_endian>::make_entry( |
| 8015 | Mips_symbol<size>* gsym) |
| 8016 | { |
| 8017 | if (!gsym->has_lazy_stub() && !gsym->has_plt_offset()) |
| 8018 | { |
| 8019 | this->symbols_.insert(gsym); |
| 8020 | gsym->set_has_lazy_stub(true); |
| 8021 | } |
| 8022 | } |
| 8023 | |
| 8024 | // Remove entry for a symbol. |
| 8025 | |
| 8026 | template<int size, bool big_endian> |
| 8027 | void |
| 8028 | Mips_output_data_mips_stubs<size, big_endian>::remove_entry( |
| 8029 | Mips_symbol<size>* gsym) |
| 8030 | { |
| 8031 | if (gsym->has_lazy_stub()) |
| 8032 | { |
| 8033 | this->symbols_.erase(gsym); |
| 8034 | gsym->set_has_lazy_stub(false); |
| 8035 | } |
| 8036 | } |
| 8037 | |
| 8038 | // Set stub offsets for symbols. This method expects that the number of |
| 8039 | // entries in dynamic symbol table is set. |
| 8040 | |
| 8041 | template<int size, bool big_endian> |
| 8042 | void |
| 8043 | Mips_output_data_mips_stubs<size, big_endian>::set_lazy_stub_offsets() |
| 8044 | { |
| 8045 | gold_assert(this->dynsym_count_ != -1U); |
| 8046 | |
| 8047 | if (this->stub_offsets_are_set_) |
| 8048 | return; |
| 8049 | |
| 8050 | unsigned int stub_size = this->stub_size(); |
| 8051 | unsigned int offset = 0; |
| 8052 | for (typename Mips_stubs_entry_set::const_iterator |
| 8053 | p = this->symbols_.begin(); |
| 8054 | p != this->symbols_.end(); |
| 8055 | ++p, offset += stub_size) |
| 8056 | { |
| 8057 | Mips_symbol<size>* mips_sym = *p; |
| 8058 | mips_sym->set_lazy_stub_offset(offset); |
| 8059 | } |
| 8060 | this->stub_offsets_are_set_ = true; |
| 8061 | } |
| 8062 | |
| 8063 | template<int size, bool big_endian> |
| 8064 | void |
| 8065 | Mips_output_data_mips_stubs<size, big_endian>::set_needs_dynsym_value() |
| 8066 | { |
| 8067 | for (typename Mips_stubs_entry_set::const_iterator |
| 8068 | p = this->symbols_.begin(); p != this->symbols_.end(); ++p) |
| 8069 | { |
| 8070 | Mips_symbol<size>* sym = *p; |
| 8071 | if (sym->is_from_dynobj()) |
| 8072 | sym->set_needs_dynsym_value(); |
| 8073 | } |
| 8074 | } |
| 8075 | |
| 8076 | // Write out the .MIPS.stubs. This uses the hand-coded instructions and |
| 8077 | // adjusts them as needed. |
| 8078 | |
| 8079 | template<int size, bool big_endian> |
| 8080 | void |
| 8081 | Mips_output_data_mips_stubs<size, big_endian>::do_write(Output_file* of) |
| 8082 | { |
| 8083 | const off_t offset = this->offset(); |
| 8084 | const section_size_type oview_size = |
| 8085 | convert_to_section_size_type(this->data_size()); |
| 8086 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 8087 | |
| 8088 | bool big_stub = this->dynsym_count_ > 0x10000; |
| 8089 | |
| 8090 | unsigned char* pov = oview; |
| 8091 | for (typename Mips_stubs_entry_set::const_iterator |
| 8092 | p = this->symbols_.begin(); p != this->symbols_.end(); ++p) |
| 8093 | { |
| 8094 | Mips_symbol<size>* sym = *p; |
| 8095 | const uint32_t* lazy_stub; |
| 8096 | bool n64 = this->target_->is_output_n64(); |
| 8097 | |
| 8098 | if (!this->target_->is_output_micromips()) |
| 8099 | { |
| 8100 | // Write standard (non-microMIPS) stub. |
| 8101 | if (!big_stub) |
| 8102 | { |
| 8103 | if (sym->dynsym_index() & ~0x7fff) |
| 8104 | // Dynsym index is between 32K and 64K. |
| 8105 | lazy_stub = n64 ? lazy_stub_normal_2_n64 : lazy_stub_normal_2; |
| 8106 | else |
| 8107 | // Dynsym index is less than 32K. |
| 8108 | lazy_stub = n64 ? lazy_stub_normal_1_n64 : lazy_stub_normal_1; |
| 8109 | } |
| 8110 | else |
| 8111 | lazy_stub = n64 ? lazy_stub_big_n64 : lazy_stub_big; |
| 8112 | |
| 8113 | unsigned int i = 0; |
| 8114 | elfcpp::Swap<32, big_endian>::writeval(pov, lazy_stub[i]); |
| 8115 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, lazy_stub[i + 1]); |
| 8116 | pov += 8; |
| 8117 | |
| 8118 | i += 2; |
| 8119 | if (big_stub) |
| 8120 | { |
| 8121 | // LUI instruction of the big stub. Paste high 16 bits of the |
| 8122 | // dynsym index. |
| 8123 | elfcpp::Swap<32, big_endian>::writeval(pov, |
| 8124 | lazy_stub[i] | ((sym->dynsym_index() >> 16) & 0x7fff)); |
| 8125 | pov += 4; |
| 8126 | i += 1; |
| 8127 | } |
| 8128 | elfcpp::Swap<32, big_endian>::writeval(pov, lazy_stub[i]); |
| 8129 | // Last stub instruction. Paste low 16 bits of the dynsym index. |
| 8130 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, |
| 8131 | lazy_stub[i + 1] | (sym->dynsym_index() & 0xffff)); |
| 8132 | pov += 8; |
| 8133 | } |
| 8134 | else if (this->target_->use_32bit_micromips_instructions()) |
| 8135 | { |
| 8136 | // Write microMIPS stub in insn32 mode. |
| 8137 | if (!big_stub) |
| 8138 | { |
| 8139 | if (sym->dynsym_index() & ~0x7fff) |
| 8140 | // Dynsym index is between 32K and 64K. |
| 8141 | lazy_stub = n64 ? lazy_stub_micromips32_normal_2_n64 |
| 8142 | : lazy_stub_micromips32_normal_2; |
| 8143 | else |
| 8144 | // Dynsym index is less than 32K. |
| 8145 | lazy_stub = n64 ? lazy_stub_micromips32_normal_1_n64 |
| 8146 | : lazy_stub_micromips32_normal_1; |
| 8147 | } |
| 8148 | else |
| 8149 | lazy_stub = n64 ? lazy_stub_micromips32_big_n64 |
| 8150 | : lazy_stub_micromips32_big; |
| 8151 | |
| 8152 | unsigned int i = 0; |
| 8153 | // First stub instruction. We emit 32-bit microMIPS instructions by |
| 8154 | // emitting two 16-bit parts because on microMIPS the 16-bit part of |
| 8155 | // the instruction where the opcode is must always come first, for |
| 8156 | // both little and big endian. |
| 8157 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); |
| 8158 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); |
| 8159 | // Second stub instruction. |
| 8160 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, lazy_stub[i + 2]); |
| 8161 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, lazy_stub[i + 3]); |
| 8162 | pov += 8; |
| 8163 | i += 4; |
| 8164 | if (big_stub) |
| 8165 | { |
| 8166 | // LUI instruction of the big stub. Paste high 16 bits of the |
| 8167 | // dynsym index. |
| 8168 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); |
| 8169 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, |
| 8170 | (sym->dynsym_index() >> 16) & 0x7fff); |
| 8171 | pov += 4; |
| 8172 | i += 2; |
| 8173 | } |
| 8174 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); |
| 8175 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); |
| 8176 | // Last stub instruction. Paste low 16 bits of the dynsym index. |
| 8177 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, lazy_stub[i + 2]); |
| 8178 | elfcpp::Swap<16, big_endian>::writeval(pov + 6, |
| 8179 | sym->dynsym_index() & 0xffff); |
| 8180 | pov += 8; |
| 8181 | } |
| 8182 | else |
| 8183 | { |
| 8184 | // Write microMIPS stub. |
| 8185 | if (!big_stub) |
| 8186 | { |
| 8187 | if (sym->dynsym_index() & ~0x7fff) |
| 8188 | // Dynsym index is between 32K and 64K. |
| 8189 | lazy_stub = n64 ? lazy_stub_micromips_normal_2_n64 |
| 8190 | : lazy_stub_micromips_normal_2; |
| 8191 | else |
| 8192 | // Dynsym index is less than 32K. |
| 8193 | lazy_stub = n64 ? lazy_stub_micromips_normal_1_n64 |
| 8194 | : lazy_stub_micromips_normal_1; |
| 8195 | } |
| 8196 | else |
| 8197 | lazy_stub = n64 ? lazy_stub_micromips_big_n64 |
| 8198 | : lazy_stub_micromips_big; |
| 8199 | |
| 8200 | unsigned int i = 0; |
| 8201 | // First stub instruction. We emit 32-bit microMIPS instructions by |
| 8202 | // emitting two 16-bit parts because on microMIPS the 16-bit part of |
| 8203 | // the instruction where the opcode is must always come first, for |
| 8204 | // both little and big endian. |
| 8205 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); |
| 8206 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); |
| 8207 | // Second stub instruction. |
| 8208 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, lazy_stub[i + 2]); |
| 8209 | pov += 6; |
| 8210 | i += 3; |
| 8211 | if (big_stub) |
| 8212 | { |
| 8213 | // LUI instruction of the big stub. Paste high 16 bits of the |
| 8214 | // dynsym index. |
| 8215 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); |
| 8216 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, |
| 8217 | (sym->dynsym_index() >> 16) & 0x7fff); |
| 8218 | pov += 4; |
| 8219 | i += 2; |
| 8220 | } |
| 8221 | elfcpp::Swap<16, big_endian>::writeval(pov, lazy_stub[i]); |
| 8222 | // Last stub instruction. Paste low 16 bits of the dynsym index. |
| 8223 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lazy_stub[i + 1]); |
| 8224 | elfcpp::Swap<16, big_endian>::writeval(pov + 4, |
| 8225 | sym->dynsym_index() & 0xffff); |
| 8226 | pov += 6; |
| 8227 | } |
| 8228 | } |
| 8229 | |
| 8230 | // We always allocate 20 bytes for every stub, because final dynsym count is |
| 8231 | // not known in method do_finalize_sections. There are 4 unused bytes per |
| 8232 | // stub if final dynsym count is less than 0x10000. |
| 8233 | unsigned int used = pov - oview; |
| 8234 | unsigned int unused = big_stub ? 0 : this->symbols_.size() * 4; |
| 8235 | gold_assert(static_cast<section_size_type>(used + unused) == oview_size); |
| 8236 | |
| 8237 | // Fill the unused space with zeroes. |
| 8238 | // TODO(sasa): Can we strip unused bytes during the relaxation? |
| 8239 | if (unused > 0) |
| 8240 | memset(pov, 0, unused); |
| 8241 | |
| 8242 | of->write_output_view(offset, oview_size, oview); |
| 8243 | } |
| 8244 | |
| 8245 | // Mips_output_section_reginfo methods. |
| 8246 | |
| 8247 | template<int size, bool big_endian> |
| 8248 | void |
| 8249 | Mips_output_section_reginfo<size, big_endian>::do_write(Output_file* of) |
| 8250 | { |
| 8251 | off_t offset = this->offset(); |
| 8252 | off_t data_size = this->data_size(); |
| 8253 | |
| 8254 | unsigned char* view = of->get_output_view(offset, data_size); |
| 8255 | elfcpp::Swap<size, big_endian>::writeval(view, this->gprmask_); |
| 8256 | elfcpp::Swap<size, big_endian>::writeval(view + 4, this->cprmask1_); |
| 8257 | elfcpp::Swap<size, big_endian>::writeval(view + 8, this->cprmask2_); |
| 8258 | elfcpp::Swap<size, big_endian>::writeval(view + 12, this->cprmask3_); |
| 8259 | elfcpp::Swap<size, big_endian>::writeval(view + 16, this->cprmask4_); |
| 8260 | // Write the gp value. |
| 8261 | elfcpp::Swap<size, big_endian>::writeval(view + 20, |
| 8262 | this->target_->gp_value()); |
| 8263 | |
| 8264 | of->write_output_view(offset, data_size, view); |
| 8265 | } |
| 8266 | |
| 8267 | // Mips_output_section_options methods. |
| 8268 | |
| 8269 | template<int size, bool big_endian> |
| 8270 | void |
| 8271 | Mips_output_section_options<size, big_endian>::do_write(Output_file* of) |
| 8272 | { |
| 8273 | off_t offset = this->offset(); |
| 8274 | const section_size_type oview_size = |
| 8275 | convert_to_section_size_type(this->data_size()); |
| 8276 | unsigned char* view = of->get_output_view(offset, oview_size); |
| 8277 | const unsigned char* end = view + oview_size; |
| 8278 | |
| 8279 | while (view + 8 <= end) |
| 8280 | { |
| 8281 | unsigned char kind = elfcpp::Swap<8, big_endian>::readval(view); |
| 8282 | unsigned char sz = elfcpp::Swap<8, big_endian>::readval(view + 1); |
| 8283 | if (sz < 8) |
| 8284 | { |
| 8285 | gold_error(_("Warning: bad `%s' option size %u smaller " |
| 8286 | "than its header in output section"), |
| 8287 | this->name(), sz); |
| 8288 | break; |
| 8289 | } |
| 8290 | |
| 8291 | // Only update ri_gp_value (GP register value) field of ODK_REGINFO entry. |
| 8292 | if (this->target_->is_output_n64() && kind == elfcpp::ODK_REGINFO) |
| 8293 | elfcpp::Swap<size, big_endian>::writeval(view + 32, |
| 8294 | this->target_->gp_value()); |
| 8295 | else if (kind == elfcpp::ODK_REGINFO) |
| 8296 | elfcpp::Swap<size, big_endian>::writeval(view + 28, |
| 8297 | this->target_->gp_value()); |
| 8298 | |
| 8299 | view += sz; |
| 8300 | } |
| 8301 | |
| 8302 | of->write_output_view(offset, oview_size, view); |
| 8303 | } |
| 8304 | |
| 8305 | // Mips_output_section_abiflags methods. |
| 8306 | |
| 8307 | template<int size, bool big_endian> |
| 8308 | void |
| 8309 | Mips_output_section_abiflags<size, big_endian>::do_write(Output_file* of) |
| 8310 | { |
| 8311 | off_t offset = this->offset(); |
| 8312 | off_t data_size = this->data_size(); |
| 8313 | |
| 8314 | unsigned char* view = of->get_output_view(offset, data_size); |
| 8315 | elfcpp::Swap<16, big_endian>::writeval(view, this->abiflags_.version); |
| 8316 | elfcpp::Swap<8, big_endian>::writeval(view + 2, this->abiflags_.isa_level); |
| 8317 | elfcpp::Swap<8, big_endian>::writeval(view + 3, this->abiflags_.isa_rev); |
| 8318 | elfcpp::Swap<8, big_endian>::writeval(view + 4, this->abiflags_.gpr_size); |
| 8319 | elfcpp::Swap<8, big_endian>::writeval(view + 5, this->abiflags_.cpr1_size); |
| 8320 | elfcpp::Swap<8, big_endian>::writeval(view + 6, this->abiflags_.cpr2_size); |
| 8321 | elfcpp::Swap<8, big_endian>::writeval(view + 7, this->abiflags_.fp_abi); |
| 8322 | elfcpp::Swap<32, big_endian>::writeval(view + 8, this->abiflags_.isa_ext); |
| 8323 | elfcpp::Swap<32, big_endian>::writeval(view + 12, this->abiflags_.ases); |
| 8324 | elfcpp::Swap<32, big_endian>::writeval(view + 16, this->abiflags_.flags1); |
| 8325 | elfcpp::Swap<32, big_endian>::writeval(view + 20, this->abiflags_.flags2); |
| 8326 | |
| 8327 | of->write_output_view(offset, data_size, view); |
| 8328 | } |
| 8329 | |
| 8330 | // Mips_copy_relocs methods. |
| 8331 | |
| 8332 | // Emit any saved relocs. |
| 8333 | |
| 8334 | template<int sh_type, int size, bool big_endian> |
| 8335 | void |
| 8336 | Mips_copy_relocs<sh_type, size, big_endian>::emit_mips( |
| 8337 | Output_data_reloc<sh_type, true, size, big_endian>* reloc_section, |
| 8338 | Symbol_table* symtab, Layout* layout, Target_mips<size, big_endian>* target) |
| 8339 | { |
| 8340 | for (typename Copy_relocs<sh_type, size, big_endian>:: |
| 8341 | Copy_reloc_entries::iterator p = this->entries_.begin(); |
| 8342 | p != this->entries_.end(); |
| 8343 | ++p) |
| 8344 | emit_entry(*p, reloc_section, symtab, layout, target); |
| 8345 | |
| 8346 | // We no longer need the saved information. |
| 8347 | this->entries_.clear(); |
| 8348 | } |
| 8349 | |
| 8350 | // Emit the reloc if appropriate. |
| 8351 | |
| 8352 | template<int sh_type, int size, bool big_endian> |
| 8353 | void |
| 8354 | Mips_copy_relocs<sh_type, size, big_endian>::emit_entry( |
| 8355 | Copy_reloc_entry& entry, |
| 8356 | Output_data_reloc<sh_type, true, size, big_endian>* reloc_section, |
| 8357 | Symbol_table* symtab, Layout* layout, Target_mips<size, big_endian>* target) |
| 8358 | { |
| 8359 | // If the symbol is no longer defined in a dynamic object, then we |
| 8360 | // emitted a COPY relocation, and we do not want to emit this |
| 8361 | // dynamic relocation. |
| 8362 | if (!entry.sym_->is_from_dynobj()) |
| 8363 | return; |
| 8364 | |
| 8365 | bool can_make_dynamic = (entry.reloc_type_ == elfcpp::R_MIPS_32 |
| 8366 | || entry.reloc_type_ == elfcpp::R_MIPS_REL32 |
| 8367 | || entry.reloc_type_ == elfcpp::R_MIPS_64); |
| 8368 | |
| 8369 | Mips_symbol<size>* sym = Mips_symbol<size>::as_mips_sym(entry.sym_); |
| 8370 | if (can_make_dynamic && !sym->has_static_relocs()) |
| 8371 | { |
| 8372 | Mips_relobj<size, big_endian>* object = |
| 8373 | Mips_relobj<size, big_endian>::as_mips_relobj(entry.relobj_); |
| 8374 | target->got_section(symtab, layout)->record_global_got_symbol( |
| 8375 | sym, object, entry.reloc_type_, true, false); |
| 8376 | if (!symbol_references_local(sym, sym->should_add_dynsym_entry(symtab))) |
| 8377 | target->rel_dyn_section(layout)->add_global(sym, elfcpp::R_MIPS_REL32, |
| 8378 | entry.output_section_, entry.relobj_, entry.shndx_, entry.address_); |
| 8379 | else |
| 8380 | target->rel_dyn_section(layout)->add_symbolless_global_addend( |
| 8381 | sym, elfcpp::R_MIPS_REL32, entry.output_section_, entry.relobj_, |
| 8382 | entry.shndx_, entry.address_); |
| 8383 | } |
| 8384 | else |
| 8385 | this->make_copy_reloc(symtab, layout, |
| 8386 | static_cast<Sized_symbol<size>*>(entry.sym_), |
| 8387 | entry.relobj_, |
| 8388 | reloc_section); |
| 8389 | } |
| 8390 | |
| 8391 | // Target_mips methods. |
| 8392 | |
| 8393 | // Return the value to use for a dynamic symbol which requires special |
| 8394 | // treatment. This is how we support equality comparisons of function |
| 8395 | // pointers across shared library boundaries, as described in the |
| 8396 | // processor specific ABI supplement. |
| 8397 | |
| 8398 | template<int size, bool big_endian> |
| 8399 | uint64_t |
| 8400 | Target_mips<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
| 8401 | { |
| 8402 | uint64_t value = 0; |
| 8403 | const Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(gsym); |
| 8404 | |
| 8405 | if (!mips_sym->has_lazy_stub()) |
| 8406 | { |
| 8407 | if (mips_sym->has_plt_offset()) |
| 8408 | { |
| 8409 | // We distinguish between PLT entries and lazy-binding stubs by |
| 8410 | // giving the former an st_other value of STO_MIPS_PLT. Set the |
| 8411 | // value to the stub address if there are any relocations in the |
| 8412 | // binary where pointer equality matters. |
| 8413 | if (mips_sym->pointer_equality_needed()) |
| 8414 | { |
| 8415 | // Prefer a standard MIPS PLT entry. |
| 8416 | if (mips_sym->has_mips_plt_offset()) |
| 8417 | value = this->plt_section()->mips_entry_address(mips_sym); |
| 8418 | else |
| 8419 | value = this->plt_section()->comp_entry_address(mips_sym) + 1; |
| 8420 | } |
| 8421 | else |
| 8422 | value = 0; |
| 8423 | } |
| 8424 | } |
| 8425 | else |
| 8426 | { |
| 8427 | // First, set stub offsets for symbols. This method expects that the |
| 8428 | // number of entries in dynamic symbol table is set. |
| 8429 | this->mips_stubs_section()->set_lazy_stub_offsets(); |
| 8430 | |
| 8431 | // The run-time linker uses the st_value field of the symbol |
| 8432 | // to reset the global offset table entry for this external |
| 8433 | // to its stub address when unlinking a shared object. |
| 8434 | value = this->mips_stubs_section()->stub_address(mips_sym); |
| 8435 | } |
| 8436 | |
| 8437 | if (mips_sym->has_mips16_fn_stub()) |
| 8438 | { |
| 8439 | // If we have a MIPS16 function with a stub, the dynamic symbol must |
| 8440 | // refer to the stub, since only the stub uses the standard calling |
| 8441 | // conventions. |
| 8442 | value = mips_sym->template |
| 8443 | get_mips16_fn_stub<big_endian>()->output_address(); |
| 8444 | } |
| 8445 | |
| 8446 | return value; |
| 8447 | } |
| 8448 | |
| 8449 | // Get the dynamic reloc section, creating it if necessary. It's always |
| 8450 | // .rel.dyn, even for MIPS64. |
| 8451 | |
| 8452 | template<int size, bool big_endian> |
| 8453 | typename Target_mips<size, big_endian>::Reloc_section* |
| 8454 | Target_mips<size, big_endian>::rel_dyn_section(Layout* layout) |
| 8455 | { |
| 8456 | if (this->rel_dyn_ == NULL) |
| 8457 | { |
| 8458 | gold_assert(layout != NULL); |
| 8459 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| 8460 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, |
| 8461 | elfcpp::SHF_ALLOC, this->rel_dyn_, |
| 8462 | ORDER_DYNAMIC_RELOCS, false); |
| 8463 | |
| 8464 | // First entry in .rel.dyn has to be null. |
| 8465 | // This is hack - we define dummy output data and set its address to 0, |
| 8466 | // and define absolute R_MIPS_NONE relocation with offset 0 against it. |
| 8467 | // This ensures that the entry is null. |
| 8468 | Output_data* od = new Output_data_zero_fill(0, 0); |
| 8469 | od->set_address(0); |
| 8470 | this->rel_dyn_->add_absolute(elfcpp::R_MIPS_NONE, od, 0); |
| 8471 | } |
| 8472 | return this->rel_dyn_; |
| 8473 | } |
| 8474 | |
| 8475 | // Get the GOT section, creating it if necessary. |
| 8476 | |
| 8477 | template<int size, bool big_endian> |
| 8478 | Mips_output_data_got<size, big_endian>* |
| 8479 | Target_mips<size, big_endian>::got_section(Symbol_table* symtab, |
| 8480 | Layout* layout) |
| 8481 | { |
| 8482 | if (this->got_ == NULL) |
| 8483 | { |
| 8484 | gold_assert(symtab != NULL && layout != NULL); |
| 8485 | |
| 8486 | this->got_ = new Mips_output_data_got<size, big_endian>(this, symtab, |
| 8487 | layout); |
| 8488 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 8489 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE | |
| 8490 | elfcpp::SHF_MIPS_GPREL), |
| 8491 | this->got_, ORDER_DATA, false); |
| 8492 | |
| 8493 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the .got section. |
| 8494 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 8495 | Symbol_table::PREDEFINED, |
| 8496 | this->got_, |
| 8497 | 0, 0, elfcpp::STT_OBJECT, |
| 8498 | elfcpp::STB_GLOBAL, |
| 8499 | elfcpp::STV_HIDDEN, 0, |
| 8500 | false, false); |
| 8501 | } |
| 8502 | |
| 8503 | return this->got_; |
| 8504 | } |
| 8505 | |
| 8506 | // Calculate value of _gp symbol. |
| 8507 | |
| 8508 | template<int size, bool big_endian> |
| 8509 | void |
| 8510 | Target_mips<size, big_endian>::set_gp(Layout* layout, Symbol_table* symtab) |
| 8511 | { |
| 8512 | gold_assert(this->gp_ == NULL); |
| 8513 | |
| 8514 | Sized_symbol<size>* gp = |
| 8515 | static_cast<Sized_symbol<size>*>(symtab->lookup("_gp")); |
| 8516 | |
| 8517 | // Set _gp symbol if the linker script hasn't created it. |
| 8518 | if (gp == NULL || gp->source() != Symbol::IS_CONSTANT) |
| 8519 | { |
| 8520 | // If there is no .got section, gp should be based on .sdata. |
| 8521 | Output_data* gp_section = (this->got_ != NULL |
| 8522 | ? this->got_->output_section() |
| 8523 | : layout->find_output_section(".sdata")); |
| 8524 | |
| 8525 | if (gp_section != NULL) |
| 8526 | gp = static_cast<Sized_symbol<size>*>(symtab->define_in_output_data( |
| 8527 | "_gp", NULL, Symbol_table::PREDEFINED, |
| 8528 | gp_section, MIPS_GP_OFFSET, 0, |
| 8529 | elfcpp::STT_NOTYPE, |
| 8530 | elfcpp::STB_LOCAL, |
| 8531 | elfcpp::STV_DEFAULT, |
| 8532 | 0, false, false)); |
| 8533 | } |
| 8534 | |
| 8535 | this->gp_ = gp; |
| 8536 | } |
| 8537 | |
| 8538 | // Set the dynamic symbol indexes. INDEX is the index of the first |
| 8539 | // global dynamic symbol. Pointers to the symbols are stored into the |
| 8540 | // vector SYMS. The names are added to DYNPOOL. This returns an |
| 8541 | // updated dynamic symbol index. |
| 8542 | |
| 8543 | template<int size, bool big_endian> |
| 8544 | unsigned int |
| 8545 | Target_mips<size, big_endian>::do_set_dynsym_indexes( |
| 8546 | std::vector<Symbol*>* dyn_symbols, unsigned int index, |
| 8547 | std::vector<Symbol*>* syms, Stringpool* dynpool, |
| 8548 | Versions* versions, Symbol_table* symtab) const |
| 8549 | { |
| 8550 | std::vector<Symbol*> non_got_symbols; |
| 8551 | std::vector<Symbol*> got_symbols; |
| 8552 | |
| 8553 | reorder_dyn_symbols<size, big_endian>(dyn_symbols, &non_got_symbols, |
| 8554 | &got_symbols); |
| 8555 | |
| 8556 | for (std::vector<Symbol*>::iterator p = non_got_symbols.begin(); |
| 8557 | p != non_got_symbols.end(); |
| 8558 | ++p) |
| 8559 | { |
| 8560 | Symbol* sym = *p; |
| 8561 | |
| 8562 | // Note that SYM may already have a dynamic symbol index, since |
| 8563 | // some symbols appear more than once in the symbol table, with |
| 8564 | // and without a version. |
| 8565 | |
| 8566 | if (!sym->has_dynsym_index()) |
| 8567 | { |
| 8568 | sym->set_dynsym_index(index); |
| 8569 | ++index; |
| 8570 | syms->push_back(sym); |
| 8571 | dynpool->add(sym->name(), false, NULL); |
| 8572 | |
| 8573 | // Record any version information. |
| 8574 | if (sym->version() != NULL) |
| 8575 | versions->record_version(symtab, dynpool, sym); |
| 8576 | |
| 8577 | // If the symbol is defined in a dynamic object and is |
| 8578 | // referenced in a regular object, then mark the dynamic |
| 8579 | // object as needed. This is used to implement --as-needed. |
| 8580 | if (sym->is_from_dynobj() && sym->in_reg()) |
| 8581 | sym->object()->set_is_needed(); |
| 8582 | } |
| 8583 | } |
| 8584 | |
| 8585 | for (std::vector<Symbol*>::iterator p = got_symbols.begin(); |
| 8586 | p != got_symbols.end(); |
| 8587 | ++p) |
| 8588 | { |
| 8589 | Symbol* sym = *p; |
| 8590 | if (!sym->has_dynsym_index()) |
| 8591 | { |
| 8592 | // Record any version information. |
| 8593 | if (sym->version() != NULL) |
| 8594 | versions->record_version(symtab, dynpool, sym); |
| 8595 | } |
| 8596 | } |
| 8597 | |
| 8598 | index = versions->finalize(symtab, index, syms); |
| 8599 | |
| 8600 | int got_sym_count = 0; |
| 8601 | for (std::vector<Symbol*>::iterator p = got_symbols.begin(); |
| 8602 | p != got_symbols.end(); |
| 8603 | ++p) |
| 8604 | { |
| 8605 | Symbol* sym = *p; |
| 8606 | |
| 8607 | if (!sym->has_dynsym_index()) |
| 8608 | { |
| 8609 | ++got_sym_count; |
| 8610 | sym->set_dynsym_index(index); |
| 8611 | ++index; |
| 8612 | syms->push_back(sym); |
| 8613 | dynpool->add(sym->name(), false, NULL); |
| 8614 | |
| 8615 | // If the symbol is defined in a dynamic object and is |
| 8616 | // referenced in a regular object, then mark the dynamic |
| 8617 | // object as needed. This is used to implement --as-needed. |
| 8618 | if (sym->is_from_dynobj() && sym->in_reg()) |
| 8619 | sym->object()->set_is_needed(); |
| 8620 | } |
| 8621 | } |
| 8622 | |
| 8623 | // Set index of the first symbol that has .got entry. |
| 8624 | this->got_->set_first_global_got_dynsym_index( |
| 8625 | got_sym_count > 0 ? index - got_sym_count : -1U); |
| 8626 | |
| 8627 | if (this->mips_stubs_ != NULL) |
| 8628 | this->mips_stubs_->set_dynsym_count(index); |
| 8629 | |
| 8630 | return index; |
| 8631 | } |
| 8632 | |
| 8633 | // Create a PLT entry for a global symbol referenced by r_type relocation. |
| 8634 | |
| 8635 | template<int size, bool big_endian> |
| 8636 | void |
| 8637 | Target_mips<size, big_endian>::make_plt_entry(Symbol_table* symtab, |
| 8638 | Layout* layout, |
| 8639 | Mips_symbol<size>* gsym, |
| 8640 | unsigned int r_type) |
| 8641 | { |
| 8642 | if (gsym->has_lazy_stub() || gsym->has_plt_offset()) |
| 8643 | return; |
| 8644 | |
| 8645 | if (this->plt_ == NULL) |
| 8646 | { |
| 8647 | // Create the GOT section first. |
| 8648 | this->got_section(symtab, layout); |
| 8649 | |
| 8650 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); |
| 8651 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| 8652 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| 8653 | this->got_plt_, ORDER_DATA, false); |
| 8654 | |
| 8655 | // The first two entries are reserved. |
| 8656 | this->got_plt_->set_current_data_size(2 * size/8); |
| 8657 | |
| 8658 | this->plt_ = new Mips_output_data_plt<size, big_endian>(layout, |
| 8659 | this->got_plt_, |
| 8660 | this); |
| 8661 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
| 8662 | (elfcpp::SHF_ALLOC |
| 8663 | | elfcpp::SHF_EXECINSTR), |
| 8664 | this->plt_, ORDER_PLT, false); |
| 8665 | |
| 8666 | // Make the sh_info field of .rel.plt point to .plt. |
| 8667 | Output_section* rel_plt_os = this->plt_->rel_plt()->output_section(); |
| 8668 | rel_plt_os->set_info_section(this->plt_->output_section()); |
| 8669 | } |
| 8670 | |
| 8671 | this->plt_->add_entry(gsym, r_type); |
| 8672 | } |
| 8673 | |
| 8674 | |
| 8675 | // Get the .MIPS.stubs section, creating it if necessary. |
| 8676 | |
| 8677 | template<int size, bool big_endian> |
| 8678 | Mips_output_data_mips_stubs<size, big_endian>* |
| 8679 | Target_mips<size, big_endian>::mips_stubs_section(Layout* layout) |
| 8680 | { |
| 8681 | if (this->mips_stubs_ == NULL) |
| 8682 | { |
| 8683 | this->mips_stubs_ = |
| 8684 | new Mips_output_data_mips_stubs<size, big_endian>(this); |
| 8685 | layout->add_output_section_data(".MIPS.stubs", elfcpp::SHT_PROGBITS, |
| 8686 | (elfcpp::SHF_ALLOC |
| 8687 | | elfcpp::SHF_EXECINSTR), |
| 8688 | this->mips_stubs_, ORDER_PLT, false); |
| 8689 | } |
| 8690 | return this->mips_stubs_; |
| 8691 | } |
| 8692 | |
| 8693 | // Get the LA25 stub section, creating it if necessary. |
| 8694 | |
| 8695 | template<int size, bool big_endian> |
| 8696 | Mips_output_data_la25_stub<size, big_endian>* |
| 8697 | Target_mips<size, big_endian>::la25_stub_section(Layout* layout) |
| 8698 | { |
| 8699 | if (this->la25_stub_ == NULL) |
| 8700 | { |
| 8701 | this->la25_stub_ = new Mips_output_data_la25_stub<size, big_endian>(); |
| 8702 | layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS, |
| 8703 | (elfcpp::SHF_ALLOC |
| 8704 | | elfcpp::SHF_EXECINSTR), |
| 8705 | this->la25_stub_, ORDER_TEXT, false); |
| 8706 | } |
| 8707 | return this->la25_stub_; |
| 8708 | } |
| 8709 | |
| 8710 | // Process the relocations to determine unreferenced sections for |
| 8711 | // garbage collection. |
| 8712 | |
| 8713 | template<int size, bool big_endian> |
| 8714 | void |
| 8715 | Target_mips<size, big_endian>::gc_process_relocs( |
| 8716 | Symbol_table* symtab, |
| 8717 | Layout* layout, |
| 8718 | Sized_relobj_file<size, big_endian>* object, |
| 8719 | unsigned int data_shndx, |
| 8720 | unsigned int sh_type, |
| 8721 | const unsigned char* prelocs, |
| 8722 | size_t reloc_count, |
| 8723 | Output_section* output_section, |
| 8724 | bool needs_special_offset_handling, |
| 8725 | size_t local_symbol_count, |
| 8726 | const unsigned char* plocal_symbols) |
| 8727 | { |
| 8728 | typedef Target_mips<size, big_endian> Mips; |
| 8729 | |
| 8730 | if (sh_type == elfcpp::SHT_REL) |
| 8731 | { |
| 8732 | typedef Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian> |
| 8733 | Classify_reloc; |
| 8734 | |
| 8735 | gold::gc_process_relocs<size, big_endian, Mips, Scan, Classify_reloc>( |
| 8736 | symtab, |
| 8737 | layout, |
| 8738 | this, |
| 8739 | object, |
| 8740 | data_shndx, |
| 8741 | prelocs, |
| 8742 | reloc_count, |
| 8743 | output_section, |
| 8744 | needs_special_offset_handling, |
| 8745 | local_symbol_count, |
| 8746 | plocal_symbols); |
| 8747 | } |
| 8748 | else if (sh_type == elfcpp::SHT_RELA) |
| 8749 | { |
| 8750 | typedef Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 8751 | Classify_reloc; |
| 8752 | |
| 8753 | gold::gc_process_relocs<size, big_endian, Mips, Scan, Classify_reloc>( |
| 8754 | symtab, |
| 8755 | layout, |
| 8756 | this, |
| 8757 | object, |
| 8758 | data_shndx, |
| 8759 | prelocs, |
| 8760 | reloc_count, |
| 8761 | output_section, |
| 8762 | needs_special_offset_handling, |
| 8763 | local_symbol_count, |
| 8764 | plocal_symbols); |
| 8765 | } |
| 8766 | else |
| 8767 | gold_unreachable(); |
| 8768 | } |
| 8769 | |
| 8770 | // Scan relocations for a section. |
| 8771 | |
| 8772 | template<int size, bool big_endian> |
| 8773 | void |
| 8774 | Target_mips<size, big_endian>::scan_relocs( |
| 8775 | Symbol_table* symtab, |
| 8776 | Layout* layout, |
| 8777 | Sized_relobj_file<size, big_endian>* object, |
| 8778 | unsigned int data_shndx, |
| 8779 | unsigned int sh_type, |
| 8780 | const unsigned char* prelocs, |
| 8781 | size_t reloc_count, |
| 8782 | Output_section* output_section, |
| 8783 | bool needs_special_offset_handling, |
| 8784 | size_t local_symbol_count, |
| 8785 | const unsigned char* plocal_symbols) |
| 8786 | { |
| 8787 | typedef Target_mips<size, big_endian> Mips; |
| 8788 | |
| 8789 | if (sh_type == elfcpp::SHT_REL) |
| 8790 | { |
| 8791 | typedef Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian> |
| 8792 | Classify_reloc; |
| 8793 | |
| 8794 | gold::scan_relocs<size, big_endian, Mips, Scan, Classify_reloc>( |
| 8795 | symtab, |
| 8796 | layout, |
| 8797 | this, |
| 8798 | object, |
| 8799 | data_shndx, |
| 8800 | prelocs, |
| 8801 | reloc_count, |
| 8802 | output_section, |
| 8803 | needs_special_offset_handling, |
| 8804 | local_symbol_count, |
| 8805 | plocal_symbols); |
| 8806 | } |
| 8807 | else if (sh_type == elfcpp::SHT_RELA) |
| 8808 | { |
| 8809 | typedef Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 8810 | Classify_reloc; |
| 8811 | |
| 8812 | gold::scan_relocs<size, big_endian, Mips, Scan, Classify_reloc>( |
| 8813 | symtab, |
| 8814 | layout, |
| 8815 | this, |
| 8816 | object, |
| 8817 | data_shndx, |
| 8818 | prelocs, |
| 8819 | reloc_count, |
| 8820 | output_section, |
| 8821 | needs_special_offset_handling, |
| 8822 | local_symbol_count, |
| 8823 | plocal_symbols); |
| 8824 | } |
| 8825 | } |
| 8826 | |
| 8827 | template<int size, bool big_endian> |
| 8828 | bool |
| 8829 | Target_mips<size, big_endian>::mips_32bit_flags(elfcpp::Elf_Word flags) |
| 8830 | { |
| 8831 | return ((flags & elfcpp::EF_MIPS_32BITMODE) != 0 |
| 8832 | || (flags & elfcpp::EF_MIPS_ABI) == elfcpp::E_MIPS_ABI_O32 |
| 8833 | || (flags & elfcpp::EF_MIPS_ABI) == elfcpp::E_MIPS_ABI_EABI32 |
| 8834 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_1 |
| 8835 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_2 |
| 8836 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_32 |
| 8837 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_32R2 |
| 8838 | || (flags & elfcpp::EF_MIPS_ARCH) == elfcpp::E_MIPS_ARCH_32R6); |
| 8839 | } |
| 8840 | |
| 8841 | // Return the MACH for a MIPS e_flags value. |
| 8842 | template<int size, bool big_endian> |
| 8843 | unsigned int |
| 8844 | Target_mips<size, big_endian>::elf_mips_mach(elfcpp::Elf_Word flags) |
| 8845 | { |
| 8846 | switch (flags & elfcpp::EF_MIPS_MACH) |
| 8847 | { |
| 8848 | case elfcpp::E_MIPS_MACH_3900: |
| 8849 | return mach_mips3900; |
| 8850 | |
| 8851 | case elfcpp::E_MIPS_MACH_4010: |
| 8852 | return mach_mips4010; |
| 8853 | |
| 8854 | case elfcpp::E_MIPS_MACH_4100: |
| 8855 | return mach_mips4100; |
| 8856 | |
| 8857 | case elfcpp::E_MIPS_MACH_4111: |
| 8858 | return mach_mips4111; |
| 8859 | |
| 8860 | case elfcpp::E_MIPS_MACH_4120: |
| 8861 | return mach_mips4120; |
| 8862 | |
| 8863 | case elfcpp::E_MIPS_MACH_4650: |
| 8864 | return mach_mips4650; |
| 8865 | |
| 8866 | case elfcpp::E_MIPS_MACH_5400: |
| 8867 | return mach_mips5400; |
| 8868 | |
| 8869 | case elfcpp::E_MIPS_MACH_5500: |
| 8870 | return mach_mips5500; |
| 8871 | |
| 8872 | case elfcpp::E_MIPS_MACH_5900: |
| 8873 | return mach_mips5900; |
| 8874 | |
| 8875 | case elfcpp::E_MIPS_MACH_9000: |
| 8876 | return mach_mips9000; |
| 8877 | |
| 8878 | case elfcpp::E_MIPS_MACH_SB1: |
| 8879 | return mach_mips_sb1; |
| 8880 | |
| 8881 | case elfcpp::E_MIPS_MACH_LS2E: |
| 8882 | return mach_mips_loongson_2e; |
| 8883 | |
| 8884 | case elfcpp::E_MIPS_MACH_LS2F: |
| 8885 | return mach_mips_loongson_2f; |
| 8886 | |
| 8887 | case elfcpp::E_MIPS_MACH_LS3A: |
| 8888 | return mach_mips_loongson_3a; |
| 8889 | |
| 8890 | case elfcpp::E_MIPS_MACH_OCTEON3: |
| 8891 | return mach_mips_octeon3; |
| 8892 | |
| 8893 | case elfcpp::E_MIPS_MACH_OCTEON2: |
| 8894 | return mach_mips_octeon2; |
| 8895 | |
| 8896 | case elfcpp::E_MIPS_MACH_OCTEON: |
| 8897 | return mach_mips_octeon; |
| 8898 | |
| 8899 | case elfcpp::E_MIPS_MACH_XLR: |
| 8900 | return mach_mips_xlr; |
| 8901 | |
| 8902 | default: |
| 8903 | switch (flags & elfcpp::EF_MIPS_ARCH) |
| 8904 | { |
| 8905 | default: |
| 8906 | case elfcpp::E_MIPS_ARCH_1: |
| 8907 | return mach_mips3000; |
| 8908 | |
| 8909 | case elfcpp::E_MIPS_ARCH_2: |
| 8910 | return mach_mips6000; |
| 8911 | |
| 8912 | case elfcpp::E_MIPS_ARCH_3: |
| 8913 | return mach_mips4000; |
| 8914 | |
| 8915 | case elfcpp::E_MIPS_ARCH_4: |
| 8916 | return mach_mips8000; |
| 8917 | |
| 8918 | case elfcpp::E_MIPS_ARCH_5: |
| 8919 | return mach_mips5; |
| 8920 | |
| 8921 | case elfcpp::E_MIPS_ARCH_32: |
| 8922 | return mach_mipsisa32; |
| 8923 | |
| 8924 | case elfcpp::E_MIPS_ARCH_64: |
| 8925 | return mach_mipsisa64; |
| 8926 | |
| 8927 | case elfcpp::E_MIPS_ARCH_32R2: |
| 8928 | return mach_mipsisa32r2; |
| 8929 | |
| 8930 | case elfcpp::E_MIPS_ARCH_32R6: |
| 8931 | return mach_mipsisa32r6; |
| 8932 | |
| 8933 | case elfcpp::E_MIPS_ARCH_64R2: |
| 8934 | return mach_mipsisa64r2; |
| 8935 | |
| 8936 | case elfcpp::E_MIPS_ARCH_64R6: |
| 8937 | return mach_mipsisa64r6; |
| 8938 | } |
| 8939 | } |
| 8940 | |
| 8941 | return 0; |
| 8942 | } |
| 8943 | |
| 8944 | // Return the MACH for each .MIPS.abiflags ISA Extension. |
| 8945 | |
| 8946 | template<int size, bool big_endian> |
| 8947 | unsigned int |
| 8948 | Target_mips<size, big_endian>::mips_isa_ext_mach(unsigned int isa_ext) |
| 8949 | { |
| 8950 | switch (isa_ext) |
| 8951 | { |
| 8952 | case elfcpp::AFL_EXT_3900: |
| 8953 | return mach_mips3900; |
| 8954 | |
| 8955 | case elfcpp::AFL_EXT_4010: |
| 8956 | return mach_mips4010; |
| 8957 | |
| 8958 | case elfcpp::AFL_EXT_4100: |
| 8959 | return mach_mips4100; |
| 8960 | |
| 8961 | case elfcpp::AFL_EXT_4111: |
| 8962 | return mach_mips4111; |
| 8963 | |
| 8964 | case elfcpp::AFL_EXT_4120: |
| 8965 | return mach_mips4120; |
| 8966 | |
| 8967 | case elfcpp::AFL_EXT_4650: |
| 8968 | return mach_mips4650; |
| 8969 | |
| 8970 | case elfcpp::AFL_EXT_5400: |
| 8971 | return mach_mips5400; |
| 8972 | |
| 8973 | case elfcpp::AFL_EXT_5500: |
| 8974 | return mach_mips5500; |
| 8975 | |
| 8976 | case elfcpp::AFL_EXT_5900: |
| 8977 | return mach_mips5900; |
| 8978 | |
| 8979 | case elfcpp::AFL_EXT_10000: |
| 8980 | return mach_mips10000; |
| 8981 | |
| 8982 | case elfcpp::AFL_EXT_LOONGSON_2E: |
| 8983 | return mach_mips_loongson_2e; |
| 8984 | |
| 8985 | case elfcpp::AFL_EXT_LOONGSON_2F: |
| 8986 | return mach_mips_loongson_2f; |
| 8987 | |
| 8988 | case elfcpp::AFL_EXT_LOONGSON_3A: |
| 8989 | return mach_mips_loongson_3a; |
| 8990 | |
| 8991 | case elfcpp::AFL_EXT_SB1: |
| 8992 | return mach_mips_sb1; |
| 8993 | |
| 8994 | case elfcpp::AFL_EXT_OCTEON: |
| 8995 | return mach_mips_octeon; |
| 8996 | |
| 8997 | case elfcpp::AFL_EXT_OCTEONP: |
| 8998 | return mach_mips_octeonp; |
| 8999 | |
| 9000 | case elfcpp::AFL_EXT_OCTEON2: |
| 9001 | return mach_mips_octeon2; |
| 9002 | |
| 9003 | case elfcpp::AFL_EXT_XLR: |
| 9004 | return mach_mips_xlr; |
| 9005 | |
| 9006 | default: |
| 9007 | return mach_mips3000; |
| 9008 | } |
| 9009 | } |
| 9010 | |
| 9011 | // Return the .MIPS.abiflags value representing each ISA Extension. |
| 9012 | |
| 9013 | template<int size, bool big_endian> |
| 9014 | unsigned int |
| 9015 | Target_mips<size, big_endian>::mips_isa_ext(unsigned int mips_mach) |
| 9016 | { |
| 9017 | switch (mips_mach) |
| 9018 | { |
| 9019 | case mach_mips3900: |
| 9020 | return elfcpp::AFL_EXT_3900; |
| 9021 | |
| 9022 | case mach_mips4010: |
| 9023 | return elfcpp::AFL_EXT_4010; |
| 9024 | |
| 9025 | case mach_mips4100: |
| 9026 | return elfcpp::AFL_EXT_4100; |
| 9027 | |
| 9028 | case mach_mips4111: |
| 9029 | return elfcpp::AFL_EXT_4111; |
| 9030 | |
| 9031 | case mach_mips4120: |
| 9032 | return elfcpp::AFL_EXT_4120; |
| 9033 | |
| 9034 | case mach_mips4650: |
| 9035 | return elfcpp::AFL_EXT_4650; |
| 9036 | |
| 9037 | case mach_mips5400: |
| 9038 | return elfcpp::AFL_EXT_5400; |
| 9039 | |
| 9040 | case mach_mips5500: |
| 9041 | return elfcpp::AFL_EXT_5500; |
| 9042 | |
| 9043 | case mach_mips5900: |
| 9044 | return elfcpp::AFL_EXT_5900; |
| 9045 | |
| 9046 | case mach_mips10000: |
| 9047 | return elfcpp::AFL_EXT_10000; |
| 9048 | |
| 9049 | case mach_mips_loongson_2e: |
| 9050 | return elfcpp::AFL_EXT_LOONGSON_2E; |
| 9051 | |
| 9052 | case mach_mips_loongson_2f: |
| 9053 | return elfcpp::AFL_EXT_LOONGSON_2F; |
| 9054 | |
| 9055 | case mach_mips_loongson_3a: |
| 9056 | return elfcpp::AFL_EXT_LOONGSON_3A; |
| 9057 | |
| 9058 | case mach_mips_sb1: |
| 9059 | return elfcpp::AFL_EXT_SB1; |
| 9060 | |
| 9061 | case mach_mips_octeon: |
| 9062 | return elfcpp::AFL_EXT_OCTEON; |
| 9063 | |
| 9064 | case mach_mips_octeonp: |
| 9065 | return elfcpp::AFL_EXT_OCTEONP; |
| 9066 | |
| 9067 | case mach_mips_octeon3: |
| 9068 | return elfcpp::AFL_EXT_OCTEON3; |
| 9069 | |
| 9070 | case mach_mips_octeon2: |
| 9071 | return elfcpp::AFL_EXT_OCTEON2; |
| 9072 | |
| 9073 | case mach_mips_xlr: |
| 9074 | return elfcpp::AFL_EXT_XLR; |
| 9075 | |
| 9076 | default: |
| 9077 | return 0; |
| 9078 | } |
| 9079 | } |
| 9080 | |
| 9081 | // Update the isa_level, isa_rev, isa_ext fields of abiflags. |
| 9082 | |
| 9083 | template<int size, bool big_endian> |
| 9084 | void |
| 9085 | Target_mips<size, big_endian>::update_abiflags_isa(const std::string& name, |
| 9086 | elfcpp::Elf_Word e_flags, Mips_abiflags<big_endian>* abiflags) |
| 9087 | { |
| 9088 | int new_isa = 0; |
| 9089 | switch (e_flags & elfcpp::EF_MIPS_ARCH) |
| 9090 | { |
| 9091 | case elfcpp::E_MIPS_ARCH_1: |
| 9092 | new_isa = this->level_rev(1, 0); |
| 9093 | break; |
| 9094 | case elfcpp::E_MIPS_ARCH_2: |
| 9095 | new_isa = this->level_rev(2, 0); |
| 9096 | break; |
| 9097 | case elfcpp::E_MIPS_ARCH_3: |
| 9098 | new_isa = this->level_rev(3, 0); |
| 9099 | break; |
| 9100 | case elfcpp::E_MIPS_ARCH_4: |
| 9101 | new_isa = this->level_rev(4, 0); |
| 9102 | break; |
| 9103 | case elfcpp::E_MIPS_ARCH_5: |
| 9104 | new_isa = this->level_rev(5, 0); |
| 9105 | break; |
| 9106 | case elfcpp::E_MIPS_ARCH_32: |
| 9107 | new_isa = this->level_rev(32, 1); |
| 9108 | break; |
| 9109 | case elfcpp::E_MIPS_ARCH_32R2: |
| 9110 | new_isa = this->level_rev(32, 2); |
| 9111 | break; |
| 9112 | case elfcpp::E_MIPS_ARCH_32R6: |
| 9113 | new_isa = this->level_rev(32, 6); |
| 9114 | break; |
| 9115 | case elfcpp::E_MIPS_ARCH_64: |
| 9116 | new_isa = this->level_rev(64, 1); |
| 9117 | break; |
| 9118 | case elfcpp::E_MIPS_ARCH_64R2: |
| 9119 | new_isa = this->level_rev(64, 2); |
| 9120 | break; |
| 9121 | case elfcpp::E_MIPS_ARCH_64R6: |
| 9122 | new_isa = this->level_rev(64, 6); |
| 9123 | break; |
| 9124 | default: |
| 9125 | gold_error(_("%s: Unknown architecture %s"), name.c_str(), |
| 9126 | this->elf_mips_mach_name(e_flags)); |
| 9127 | } |
| 9128 | |
| 9129 | if (new_isa > this->level_rev(abiflags->isa_level, abiflags->isa_rev)) |
| 9130 | { |
| 9131 | // Decode a single value into level and revision. |
| 9132 | abiflags->isa_level = new_isa >> 3; |
| 9133 | abiflags->isa_rev = new_isa & 0x7; |
| 9134 | } |
| 9135 | |
| 9136 | // Update the isa_ext if needed. |
| 9137 | if (this->mips_mach_extends(this->mips_isa_ext_mach(abiflags->isa_ext), |
| 9138 | this->elf_mips_mach(e_flags))) |
| 9139 | abiflags->isa_ext = this->mips_isa_ext(this->elf_mips_mach(e_flags)); |
| 9140 | } |
| 9141 | |
| 9142 | // Infer the content of the ABI flags based on the elf header. |
| 9143 | |
| 9144 | template<int size, bool big_endian> |
| 9145 | void |
| 9146 | Target_mips<size, big_endian>::infer_abiflags( |
| 9147 | Mips_relobj<size, big_endian>* relobj, Mips_abiflags<big_endian>* abiflags) |
| 9148 | { |
| 9149 | const Attributes_section_data* pasd = relobj->attributes_section_data(); |
| 9150 | int attr_fp_abi = elfcpp::Val_GNU_MIPS_ABI_FP_ANY; |
| 9151 | elfcpp::Elf_Word e_flags = relobj->processor_specific_flags(); |
| 9152 | |
| 9153 | this->update_abiflags_isa(relobj->name(), e_flags, abiflags); |
| 9154 | if (pasd != NULL) |
| 9155 | { |
| 9156 | // Read fp_abi from the .gnu.attribute section. |
| 9157 | const Object_attribute* attr = |
| 9158 | pasd->known_attributes(Object_attribute::OBJ_ATTR_GNU); |
| 9159 | attr_fp_abi = attr[elfcpp::Tag_GNU_MIPS_ABI_FP].int_value(); |
| 9160 | } |
| 9161 | |
| 9162 | abiflags->fp_abi = attr_fp_abi; |
| 9163 | abiflags->cpr1_size = elfcpp::AFL_REG_NONE; |
| 9164 | abiflags->cpr2_size = elfcpp::AFL_REG_NONE; |
| 9165 | abiflags->gpr_size = this->mips_32bit_flags(e_flags) ? elfcpp::AFL_REG_32 |
| 9166 | : elfcpp::AFL_REG_64; |
| 9167 | |
| 9168 | if (abiflags->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_SINGLE |
| 9169 | || abiflags->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_XX |
| 9170 | || (abiflags->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_DOUBLE |
| 9171 | && abiflags->gpr_size == elfcpp::AFL_REG_32)) |
| 9172 | abiflags->cpr1_size = elfcpp::AFL_REG_32; |
| 9173 | else if (abiflags->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_DOUBLE |
| 9174 | || abiflags->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_64 |
| 9175 | || abiflags->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_64A) |
| 9176 | abiflags->cpr1_size = elfcpp::AFL_REG_64; |
| 9177 | |
| 9178 | if (e_flags & elfcpp::EF_MIPS_ARCH_ASE_MDMX) |
| 9179 | abiflags->ases |= elfcpp::AFL_ASE_MDMX; |
| 9180 | if (e_flags & elfcpp::EF_MIPS_ARCH_ASE_M16) |
| 9181 | abiflags->ases |= elfcpp::AFL_ASE_MIPS16; |
| 9182 | if (e_flags & elfcpp::EF_MIPS_ARCH_ASE_MICROMIPS) |
| 9183 | abiflags->ases |= elfcpp::AFL_ASE_MICROMIPS; |
| 9184 | |
| 9185 | if (abiflags->fp_abi != elfcpp::Val_GNU_MIPS_ABI_FP_ANY |
| 9186 | && abiflags->fp_abi != elfcpp::Val_GNU_MIPS_ABI_FP_SOFT |
| 9187 | && abiflags->fp_abi != elfcpp::Val_GNU_MIPS_ABI_FP_64A |
| 9188 | && abiflags->isa_level >= 32 |
| 9189 | && abiflags->isa_ext != elfcpp::AFL_EXT_LOONGSON_3A) |
| 9190 | abiflags->flags1 |= elfcpp::AFL_FLAGS1_ODDSPREG; |
| 9191 | } |
| 9192 | |
| 9193 | // Create abiflags from elf header or from .MIPS.abiflags section. |
| 9194 | |
| 9195 | template<int size, bool big_endian> |
| 9196 | void |
| 9197 | Target_mips<size, big_endian>::create_abiflags( |
| 9198 | Mips_relobj<size, big_endian>* relobj, |
| 9199 | Mips_abiflags<big_endian>* abiflags) |
| 9200 | { |
| 9201 | Mips_abiflags<big_endian>* sec_abiflags = relobj->abiflags(); |
| 9202 | Mips_abiflags<big_endian> header_abiflags; |
| 9203 | |
| 9204 | this->infer_abiflags(relobj, &header_abiflags); |
| 9205 | |
| 9206 | if (sec_abiflags == NULL) |
| 9207 | { |
| 9208 | // If there is no input .MIPS.abiflags section, use abiflags created |
| 9209 | // from elf header. |
| 9210 | *abiflags = header_abiflags; |
| 9211 | return; |
| 9212 | } |
| 9213 | |
| 9214 | this->has_abiflags_section_ = true; |
| 9215 | |
| 9216 | // It is not possible to infer the correct ISA revision for R3 or R5 |
| 9217 | // so drop down to R2 for the checks. |
| 9218 | unsigned char isa_rev = sec_abiflags->isa_rev; |
| 9219 | if (isa_rev == 3 || isa_rev == 5) |
| 9220 | isa_rev = 2; |
| 9221 | |
| 9222 | // Check compatibility between abiflags created from elf header |
| 9223 | // and abiflags from .MIPS.abiflags section in this object file. |
| 9224 | if (this->level_rev(sec_abiflags->isa_level, isa_rev) |
| 9225 | < this->level_rev(header_abiflags.isa_level, header_abiflags.isa_rev)) |
| 9226 | gold_warning(_("%s: Inconsistent ISA between e_flags and .MIPS.abiflags"), |
| 9227 | relobj->name().c_str()); |
| 9228 | if (header_abiflags.fp_abi != elfcpp::Val_GNU_MIPS_ABI_FP_ANY |
| 9229 | && sec_abiflags->fp_abi != header_abiflags.fp_abi) |
| 9230 | gold_warning(_("%s: Inconsistent FP ABI between .gnu.attributes and " |
| 9231 | ".MIPS.abiflags"), relobj->name().c_str()); |
| 9232 | if ((sec_abiflags->ases & header_abiflags.ases) != header_abiflags.ases) |
| 9233 | gold_warning(_("%s: Inconsistent ASEs between e_flags and .MIPS.abiflags"), |
| 9234 | relobj->name().c_str()); |
| 9235 | // The isa_ext is allowed to be an extension of what can be inferred |
| 9236 | // from e_flags. |
| 9237 | if (!this->mips_mach_extends(this->mips_isa_ext_mach(header_abiflags.isa_ext), |
| 9238 | this->mips_isa_ext_mach(sec_abiflags->isa_ext))) |
| 9239 | gold_warning(_("%s: Inconsistent ISA extensions between e_flags and " |
| 9240 | ".MIPS.abiflags"), relobj->name().c_str()); |
| 9241 | if (sec_abiflags->flags2 != 0) |
| 9242 | gold_warning(_("%s: Unexpected flag in the flags2 field of " |
| 9243 | ".MIPS.abiflags (0x%x)"), relobj->name().c_str(), |
| 9244 | sec_abiflags->flags2); |
| 9245 | // Use abiflags from .MIPS.abiflags section. |
| 9246 | *abiflags = *sec_abiflags; |
| 9247 | } |
| 9248 | |
| 9249 | // Return the meaning of fp_abi, or "unknown" if not known. |
| 9250 | |
| 9251 | template<int size, bool big_endian> |
| 9252 | const char* |
| 9253 | Target_mips<size, big_endian>::fp_abi_string(int fp) |
| 9254 | { |
| 9255 | switch (fp) |
| 9256 | { |
| 9257 | case elfcpp::Val_GNU_MIPS_ABI_FP_DOUBLE: |
| 9258 | return "-mdouble-float"; |
| 9259 | case elfcpp::Val_GNU_MIPS_ABI_FP_SINGLE: |
| 9260 | return "-msingle-float"; |
| 9261 | case elfcpp::Val_GNU_MIPS_ABI_FP_SOFT: |
| 9262 | return "-msoft-float"; |
| 9263 | case elfcpp::Val_GNU_MIPS_ABI_FP_OLD_64: |
| 9264 | return _("-mips32r2 -mfp64 (12 callee-saved)"); |
| 9265 | case elfcpp::Val_GNU_MIPS_ABI_FP_XX: |
| 9266 | return "-mfpxx"; |
| 9267 | case elfcpp::Val_GNU_MIPS_ABI_FP_64: |
| 9268 | return "-mgp32 -mfp64"; |
| 9269 | case elfcpp::Val_GNU_MIPS_ABI_FP_64A: |
| 9270 | return "-mgp32 -mfp64 -mno-odd-spreg"; |
| 9271 | default: |
| 9272 | return "unknown"; |
| 9273 | } |
| 9274 | } |
| 9275 | |
| 9276 | // Select fp_abi. |
| 9277 | |
| 9278 | template<int size, bool big_endian> |
| 9279 | int |
| 9280 | Target_mips<size, big_endian>::select_fp_abi(const std::string& name, int in_fp, |
| 9281 | int out_fp) |
| 9282 | { |
| 9283 | if (in_fp == out_fp) |
| 9284 | return out_fp; |
| 9285 | |
| 9286 | if (out_fp == elfcpp::Val_GNU_MIPS_ABI_FP_ANY) |
| 9287 | return in_fp; |
| 9288 | else if (out_fp == elfcpp::Val_GNU_MIPS_ABI_FP_XX |
| 9289 | && (in_fp == elfcpp::Val_GNU_MIPS_ABI_FP_DOUBLE |
| 9290 | || in_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64 |
| 9291 | || in_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64A)) |
| 9292 | return in_fp; |
| 9293 | else if (in_fp == elfcpp::Val_GNU_MIPS_ABI_FP_XX |
| 9294 | && (out_fp == elfcpp::Val_GNU_MIPS_ABI_FP_DOUBLE |
| 9295 | || out_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64 |
| 9296 | || out_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64A)) |
| 9297 | return out_fp; // Keep the current setting. |
| 9298 | else if (out_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64A |
| 9299 | && in_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64) |
| 9300 | return in_fp; |
| 9301 | else if (in_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64A |
| 9302 | && out_fp == elfcpp::Val_GNU_MIPS_ABI_FP_64) |
| 9303 | return out_fp; // Keep the current setting. |
| 9304 | else if (in_fp != elfcpp::Val_GNU_MIPS_ABI_FP_ANY) |
| 9305 | gold_warning(_("%s: FP ABI %s is incompatible with %s"), name.c_str(), |
| 9306 | fp_abi_string(in_fp), fp_abi_string(out_fp)); |
| 9307 | return out_fp; |
| 9308 | } |
| 9309 | |
| 9310 | // Merge attributes from input object. |
| 9311 | |
| 9312 | template<int size, bool big_endian> |
| 9313 | void |
| 9314 | Target_mips<size, big_endian>::merge_obj_attributes(const std::string& name, |
| 9315 | const Attributes_section_data* pasd) |
| 9316 | { |
| 9317 | // Return if there is no attributes section data. |
| 9318 | if (pasd == NULL) |
| 9319 | return; |
| 9320 | |
| 9321 | // If output has no object attributes, just copy. |
| 9322 | if (this->attributes_section_data_ == NULL) |
| 9323 | { |
| 9324 | this->attributes_section_data_ = new Attributes_section_data(*pasd); |
| 9325 | return; |
| 9326 | } |
| 9327 | |
| 9328 | Object_attribute* out_attr = this->attributes_section_data_->known_attributes( |
| 9329 | Object_attribute::OBJ_ATTR_GNU); |
| 9330 | |
| 9331 | out_attr[elfcpp::Tag_GNU_MIPS_ABI_FP].set_type(1); |
| 9332 | out_attr[elfcpp::Tag_GNU_MIPS_ABI_FP].set_int_value(this->abiflags_->fp_abi); |
| 9333 | |
| 9334 | // Merge Tag_compatibility attributes and any common GNU ones. |
| 9335 | this->attributes_section_data_->merge(name.c_str(), pasd); |
| 9336 | } |
| 9337 | |
| 9338 | // Merge abiflags from input object. |
| 9339 | |
| 9340 | template<int size, bool big_endian> |
| 9341 | void |
| 9342 | Target_mips<size, big_endian>::merge_obj_abiflags(const std::string& name, |
| 9343 | Mips_abiflags<big_endian>* in_abiflags) |
| 9344 | { |
| 9345 | // If output has no abiflags, just copy. |
| 9346 | if (this->abiflags_ == NULL) |
| 9347 | { |
| 9348 | this->abiflags_ = new Mips_abiflags<big_endian>(*in_abiflags); |
| 9349 | return; |
| 9350 | } |
| 9351 | |
| 9352 | this->abiflags_->fp_abi = this->select_fp_abi(name, in_abiflags->fp_abi, |
| 9353 | this->abiflags_->fp_abi); |
| 9354 | |
| 9355 | // Merge abiflags. |
| 9356 | this->abiflags_->isa_level = std::max(this->abiflags_->isa_level, |
| 9357 | in_abiflags->isa_level); |
| 9358 | this->abiflags_->isa_rev = std::max(this->abiflags_->isa_rev, |
| 9359 | in_abiflags->isa_rev); |
| 9360 | this->abiflags_->gpr_size = std::max(this->abiflags_->gpr_size, |
| 9361 | in_abiflags->gpr_size); |
| 9362 | this->abiflags_->cpr1_size = std::max(this->abiflags_->cpr1_size, |
| 9363 | in_abiflags->cpr1_size); |
| 9364 | this->abiflags_->cpr2_size = std::max(this->abiflags_->cpr2_size, |
| 9365 | in_abiflags->cpr2_size); |
| 9366 | this->abiflags_->ases |= in_abiflags->ases; |
| 9367 | this->abiflags_->flags1 |= in_abiflags->flags1; |
| 9368 | } |
| 9369 | |
| 9370 | // Check whether machine EXTENSION is an extension of machine BASE. |
| 9371 | template<int size, bool big_endian> |
| 9372 | bool |
| 9373 | Target_mips<size, big_endian>::mips_mach_extends(unsigned int base, |
| 9374 | unsigned int extension) |
| 9375 | { |
| 9376 | if (extension == base) |
| 9377 | return true; |
| 9378 | |
| 9379 | if ((base == mach_mipsisa32) |
| 9380 | && this->mips_mach_extends(mach_mipsisa64, extension)) |
| 9381 | return true; |
| 9382 | |
| 9383 | if ((base == mach_mipsisa32r2) |
| 9384 | && this->mips_mach_extends(mach_mipsisa64r2, extension)) |
| 9385 | return true; |
| 9386 | |
| 9387 | for (unsigned int i = 0; i < this->mips_mach_extensions_.size(); ++i) |
| 9388 | if (extension == this->mips_mach_extensions_[i].first) |
| 9389 | { |
| 9390 | extension = this->mips_mach_extensions_[i].second; |
| 9391 | if (extension == base) |
| 9392 | return true; |
| 9393 | } |
| 9394 | |
| 9395 | return false; |
| 9396 | } |
| 9397 | |
| 9398 | // Merge file header flags from input object. |
| 9399 | |
| 9400 | template<int size, bool big_endian> |
| 9401 | void |
| 9402 | Target_mips<size, big_endian>::merge_obj_e_flags(const std::string& name, |
| 9403 | elfcpp::Elf_Word in_flags) |
| 9404 | { |
| 9405 | // If flags are not set yet, just copy them. |
| 9406 | if (!this->are_processor_specific_flags_set()) |
| 9407 | { |
| 9408 | this->set_processor_specific_flags(in_flags); |
| 9409 | this->mach_ = this->elf_mips_mach(in_flags); |
| 9410 | return; |
| 9411 | } |
| 9412 | |
| 9413 | elfcpp::Elf_Word new_flags = in_flags; |
| 9414 | elfcpp::Elf_Word old_flags = this->processor_specific_flags(); |
| 9415 | elfcpp::Elf_Word merged_flags = this->processor_specific_flags(); |
| 9416 | merged_flags |= new_flags & elfcpp::EF_MIPS_NOREORDER; |
| 9417 | |
| 9418 | // Check flag compatibility. |
| 9419 | new_flags &= ~elfcpp::EF_MIPS_NOREORDER; |
| 9420 | old_flags &= ~elfcpp::EF_MIPS_NOREORDER; |
| 9421 | |
| 9422 | // Some IRIX 6 BSD-compatibility objects have this bit set. It |
| 9423 | // doesn't seem to matter. |
| 9424 | new_flags &= ~elfcpp::EF_MIPS_XGOT; |
| 9425 | old_flags &= ~elfcpp::EF_MIPS_XGOT; |
| 9426 | |
| 9427 | // MIPSpro generates ucode info in n64 objects. Again, we should |
| 9428 | // just be able to ignore this. |
| 9429 | new_flags &= ~elfcpp::EF_MIPS_UCODE; |
| 9430 | old_flags &= ~elfcpp::EF_MIPS_UCODE; |
| 9431 | |
| 9432 | if (new_flags == old_flags) |
| 9433 | { |
| 9434 | this->set_processor_specific_flags(merged_flags); |
| 9435 | return; |
| 9436 | } |
| 9437 | |
| 9438 | if (((new_flags & (elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC)) != 0) |
| 9439 | != ((old_flags & (elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC)) != 0)) |
| 9440 | gold_warning(_("%s: linking abicalls files with non-abicalls files"), |
| 9441 | name.c_str()); |
| 9442 | |
| 9443 | if (new_flags & (elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC)) |
| 9444 | merged_flags |= elfcpp::EF_MIPS_CPIC; |
| 9445 | if (!(new_flags & elfcpp::EF_MIPS_PIC)) |
| 9446 | merged_flags &= ~elfcpp::EF_MIPS_PIC; |
| 9447 | |
| 9448 | new_flags &= ~(elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC); |
| 9449 | old_flags &= ~(elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC); |
| 9450 | |
| 9451 | // Compare the ISAs. |
| 9452 | if (mips_32bit_flags(old_flags) != mips_32bit_flags(new_flags)) |
| 9453 | gold_error(_("%s: linking 32-bit code with 64-bit code"), name.c_str()); |
| 9454 | else if (!this->mips_mach_extends(this->elf_mips_mach(in_flags), this->mach_)) |
| 9455 | { |
| 9456 | // Output ISA isn't the same as, or an extension of, input ISA. |
| 9457 | if (this->mips_mach_extends(this->mach_, this->elf_mips_mach(in_flags))) |
| 9458 | { |
| 9459 | // Copy the architecture info from input object to output. Also copy |
| 9460 | // the 32-bit flag (if set) so that we continue to recognise |
| 9461 | // output as a 32-bit binary. |
| 9462 | this->mach_ = this->elf_mips_mach(in_flags); |
| 9463 | merged_flags &= ~(elfcpp::EF_MIPS_ARCH | elfcpp::EF_MIPS_MACH); |
| 9464 | merged_flags |= (new_flags & (elfcpp::EF_MIPS_ARCH |
| 9465 | | elfcpp::EF_MIPS_MACH | elfcpp::EF_MIPS_32BITMODE)); |
| 9466 | |
| 9467 | // Update the ABI flags isa_level, isa_rev, isa_ext fields. |
| 9468 | this->update_abiflags_isa(name, merged_flags, this->abiflags_); |
| 9469 | |
| 9470 | // Copy across the ABI flags if output doesn't use them |
| 9471 | // and if that was what caused us to treat input object as 32-bit. |
| 9472 | if ((old_flags & elfcpp::EF_MIPS_ABI) == 0 |
| 9473 | && this->mips_32bit_flags(new_flags) |
| 9474 | && !this->mips_32bit_flags(new_flags & ~elfcpp::EF_MIPS_ABI)) |
| 9475 | merged_flags |= new_flags & elfcpp::EF_MIPS_ABI; |
| 9476 | } |
| 9477 | else |
| 9478 | // The ISAs aren't compatible. |
| 9479 | gold_error(_("%s: linking %s module with previous %s modules"), |
| 9480 | name.c_str(), this->elf_mips_mach_name(in_flags), |
| 9481 | this->elf_mips_mach_name(merged_flags)); |
| 9482 | } |
| 9483 | |
| 9484 | new_flags &= (~(elfcpp::EF_MIPS_ARCH | elfcpp::EF_MIPS_MACH |
| 9485 | | elfcpp::EF_MIPS_32BITMODE)); |
| 9486 | old_flags &= (~(elfcpp::EF_MIPS_ARCH | elfcpp::EF_MIPS_MACH |
| 9487 | | elfcpp::EF_MIPS_32BITMODE)); |
| 9488 | |
| 9489 | // Compare ABIs. |
| 9490 | if ((new_flags & elfcpp::EF_MIPS_ABI) != (old_flags & elfcpp::EF_MIPS_ABI)) |
| 9491 | { |
| 9492 | // Only error if both are set (to different values). |
| 9493 | if ((new_flags & elfcpp::EF_MIPS_ABI) |
| 9494 | && (old_flags & elfcpp::EF_MIPS_ABI)) |
| 9495 | gold_error(_("%s: ABI mismatch: linking %s module with " |
| 9496 | "previous %s modules"), name.c_str(), |
| 9497 | this->elf_mips_abi_name(in_flags), |
| 9498 | this->elf_mips_abi_name(merged_flags)); |
| 9499 | |
| 9500 | new_flags &= ~elfcpp::EF_MIPS_ABI; |
| 9501 | old_flags &= ~elfcpp::EF_MIPS_ABI; |
| 9502 | } |
| 9503 | |
| 9504 | // Compare ASEs. Forbid linking MIPS16 and microMIPS ASE modules together |
| 9505 | // and allow arbitrary mixing of the remaining ASEs (retain the union). |
| 9506 | if ((new_flags & elfcpp::EF_MIPS_ARCH_ASE) |
| 9507 | != (old_flags & elfcpp::EF_MIPS_ARCH_ASE)) |
| 9508 | { |
| 9509 | int old_micro = old_flags & elfcpp::EF_MIPS_ARCH_ASE_MICROMIPS; |
| 9510 | int new_micro = new_flags & elfcpp::EF_MIPS_ARCH_ASE_MICROMIPS; |
| 9511 | int old_m16 = old_flags & elfcpp::EF_MIPS_ARCH_ASE_M16; |
| 9512 | int new_m16 = new_flags & elfcpp::EF_MIPS_ARCH_ASE_M16; |
| 9513 | int micro_mis = old_m16 && new_micro; |
| 9514 | int m16_mis = old_micro && new_m16; |
| 9515 | |
| 9516 | if (m16_mis || micro_mis) |
| 9517 | gold_error(_("%s: ASE mismatch: linking %s module with " |
| 9518 | "previous %s modules"), name.c_str(), |
| 9519 | m16_mis ? "MIPS16" : "microMIPS", |
| 9520 | m16_mis ? "microMIPS" : "MIPS16"); |
| 9521 | |
| 9522 | merged_flags |= new_flags & elfcpp::EF_MIPS_ARCH_ASE; |
| 9523 | |
| 9524 | new_flags &= ~ elfcpp::EF_MIPS_ARCH_ASE; |
| 9525 | old_flags &= ~ elfcpp::EF_MIPS_ARCH_ASE; |
| 9526 | } |
| 9527 | |
| 9528 | // Compare NaN encodings. |
| 9529 | if ((new_flags & elfcpp::EF_MIPS_NAN2008) != (old_flags & elfcpp::EF_MIPS_NAN2008)) |
| 9530 | { |
| 9531 | gold_error(_("%s: linking %s module with previous %s modules"), |
| 9532 | name.c_str(), |
| 9533 | (new_flags & elfcpp::EF_MIPS_NAN2008 |
| 9534 | ? "-mnan=2008" : "-mnan=legacy"), |
| 9535 | (old_flags & elfcpp::EF_MIPS_NAN2008 |
| 9536 | ? "-mnan=2008" : "-mnan=legacy")); |
| 9537 | |
| 9538 | new_flags &= ~elfcpp::EF_MIPS_NAN2008; |
| 9539 | old_flags &= ~elfcpp::EF_MIPS_NAN2008; |
| 9540 | } |
| 9541 | |
| 9542 | // Compare FP64 state. |
| 9543 | if ((new_flags & elfcpp::EF_MIPS_FP64) != (old_flags & elfcpp::EF_MIPS_FP64)) |
| 9544 | { |
| 9545 | gold_error(_("%s: linking %s module with previous %s modules"), |
| 9546 | name.c_str(), |
| 9547 | (new_flags & elfcpp::EF_MIPS_FP64 |
| 9548 | ? "-mfp64" : "-mfp32"), |
| 9549 | (old_flags & elfcpp::EF_MIPS_FP64 |
| 9550 | ? "-mfp64" : "-mfp32")); |
| 9551 | |
| 9552 | new_flags &= ~elfcpp::EF_MIPS_FP64; |
| 9553 | old_flags &= ~elfcpp::EF_MIPS_FP64; |
| 9554 | } |
| 9555 | |
| 9556 | // Warn about any other mismatches. |
| 9557 | if (new_flags != old_flags) |
| 9558 | gold_error(_("%s: uses different e_flags (0x%x) fields than previous " |
| 9559 | "modules (0x%x)"), name.c_str(), new_flags, old_flags); |
| 9560 | |
| 9561 | this->set_processor_specific_flags(merged_flags); |
| 9562 | } |
| 9563 | |
| 9564 | // Adjust ELF file header. |
| 9565 | |
| 9566 | template<int size, bool big_endian> |
| 9567 | void |
| 9568 | Target_mips<size, big_endian>::do_adjust_elf_header( |
| 9569 | unsigned char* view, |
| 9570 | int len) |
| 9571 | { |
| 9572 | gold_assert(len == elfcpp::Elf_sizes<size>::ehdr_size); |
| 9573 | |
| 9574 | elfcpp::Ehdr<size, big_endian> ehdr(view); |
| 9575 | unsigned char e_ident[elfcpp::EI_NIDENT]; |
| 9576 | elfcpp::Elf_Word flags = this->processor_specific_flags(); |
| 9577 | memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT); |
| 9578 | |
| 9579 | unsigned char ei_abiversion = 0; |
| 9580 | elfcpp::Elf_Half type = ehdr.get_e_type(); |
| 9581 | if (type == elfcpp::ET_EXEC |
| 9582 | && parameters->options().copyreloc() |
| 9583 | && (flags & (elfcpp::EF_MIPS_PIC | elfcpp::EF_MIPS_CPIC)) |
| 9584 | == elfcpp::EF_MIPS_CPIC) |
| 9585 | ei_abiversion = 1; |
| 9586 | |
| 9587 | if (this->abiflags_ != NULL |
| 9588 | && (this->abiflags_->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_64 |
| 9589 | || this->abiflags_->fp_abi == elfcpp::Val_GNU_MIPS_ABI_FP_64A)) |
| 9590 | ei_abiversion = 3; |
| 9591 | |
| 9592 | e_ident[elfcpp::EI_ABIVERSION] = ei_abiversion; |
| 9593 | elfcpp::Ehdr_write<size, big_endian> oehdr(view); |
| 9594 | oehdr.put_e_ident(e_ident); |
| 9595 | |
| 9596 | if (this->entry_symbol_is_compressed_) |
| 9597 | oehdr.put_e_entry(ehdr.get_e_entry() + 1); |
| 9598 | } |
| 9599 | |
| 9600 | // do_make_elf_object to override the same function in the base class. |
| 9601 | // We need to use a target-specific sub-class of |
| 9602 | // Sized_relobj_file<size, big_endian> to store Mips specific information. |
| 9603 | // Hence we need to have our own ELF object creation. |
| 9604 | |
| 9605 | template<int size, bool big_endian> |
| 9606 | Object* |
| 9607 | Target_mips<size, big_endian>::do_make_elf_object( |
| 9608 | const std::string& name, |
| 9609 | Input_file* input_file, |
| 9610 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| 9611 | { |
| 9612 | int et = ehdr.get_e_type(); |
| 9613 | // ET_EXEC files are valid input for --just-symbols/-R, |
| 9614 | // and we treat them as relocatable objects. |
| 9615 | if (et == elfcpp::ET_REL |
| 9616 | || (et == elfcpp::ET_EXEC && input_file->just_symbols())) |
| 9617 | { |
| 9618 | Mips_relobj<size, big_endian>* obj = |
| 9619 | new Mips_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| 9620 | obj->setup(); |
| 9621 | return obj; |
| 9622 | } |
| 9623 | else if (et == elfcpp::ET_DYN) |
| 9624 | { |
| 9625 | // TODO(sasa): Should we create Mips_dynobj? |
| 9626 | return Target::do_make_elf_object(name, input_file, offset, ehdr); |
| 9627 | } |
| 9628 | else |
| 9629 | { |
| 9630 | gold_error(_("%s: unsupported ELF file type %d"), |
| 9631 | name.c_str(), et); |
| 9632 | return NULL; |
| 9633 | } |
| 9634 | } |
| 9635 | |
| 9636 | // Finalize the sections. |
| 9637 | |
| 9638 | template <int size, bool big_endian> |
| 9639 | void |
| 9640 | Target_mips<size, big_endian>::do_finalize_sections(Layout* layout, |
| 9641 | const Input_objects* input_objects, |
| 9642 | Symbol_table* symtab) |
| 9643 | { |
| 9644 | const bool relocatable = parameters->options().relocatable(); |
| 9645 | |
| 9646 | // Add +1 to MIPS16 and microMIPS init_ and _fini symbols so that DT_INIT and |
| 9647 | // DT_FINI have correct values. |
| 9648 | Mips_symbol<size>* init = static_cast<Mips_symbol<size>*>( |
| 9649 | symtab->lookup(parameters->options().init())); |
| 9650 | if (init != NULL && (init->is_mips16() || init->is_micromips())) |
| 9651 | init->set_value(init->value() | 1); |
| 9652 | Mips_symbol<size>* fini = static_cast<Mips_symbol<size>*>( |
| 9653 | symtab->lookup(parameters->options().fini())); |
| 9654 | if (fini != NULL && (fini->is_mips16() || fini->is_micromips())) |
| 9655 | fini->set_value(fini->value() | 1); |
| 9656 | |
| 9657 | // Check whether the entry symbol is mips16 or micromips. This is needed to |
| 9658 | // adjust entry address in ELF header. |
| 9659 | Mips_symbol<size>* entry = |
| 9660 | static_cast<Mips_symbol<size>*>(symtab->lookup(this->entry_symbol_name())); |
| 9661 | this->entry_symbol_is_compressed_ = (entry != NULL && (entry->is_mips16() |
| 9662 | || entry->is_micromips())); |
| 9663 | |
| 9664 | if (!parameters->doing_static_link() |
| 9665 | && (strcmp(parameters->options().hash_style(), "gnu") == 0 |
| 9666 | || strcmp(parameters->options().hash_style(), "both") == 0)) |
| 9667 | { |
| 9668 | // .gnu.hash and the MIPS ABI require .dynsym to be sorted in different |
| 9669 | // ways. .gnu.hash needs symbols to be grouped by hash code whereas the |
| 9670 | // MIPS ABI requires a mapping between the GOT and the symbol table. |
| 9671 | gold_error(".gnu.hash is incompatible with the MIPS ABI"); |
| 9672 | } |
| 9673 | |
| 9674 | // Check whether the final section that was scanned has HI16 or GOT16 |
| 9675 | // relocations without the corresponding LO16 part. |
| 9676 | if (this->got16_addends_.size() > 0) |
| 9677 | gold_error("Can't find matching LO16 reloc"); |
| 9678 | |
| 9679 | Valtype gprmask = 0; |
| 9680 | Valtype cprmask1 = 0; |
| 9681 | Valtype cprmask2 = 0; |
| 9682 | Valtype cprmask3 = 0; |
| 9683 | Valtype cprmask4 = 0; |
| 9684 | bool has_reginfo_section = false; |
| 9685 | |
| 9686 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); |
| 9687 | p != input_objects->relobj_end(); |
| 9688 | ++p) |
| 9689 | { |
| 9690 | Mips_relobj<size, big_endian>* relobj = |
| 9691 | Mips_relobj<size, big_endian>::as_mips_relobj(*p); |
| 9692 | |
| 9693 | // Check for any mips16 stub sections that we can discard. |
| 9694 | if (!relocatable) |
| 9695 | relobj->discard_mips16_stub_sections(symtab); |
| 9696 | |
| 9697 | if (!relobj->merge_processor_specific_data()) |
| 9698 | continue; |
| 9699 | |
| 9700 | // Merge .reginfo contents of input objects. |
| 9701 | if (relobj->has_reginfo_section()) |
| 9702 | { |
| 9703 | has_reginfo_section = true; |
| 9704 | gprmask |= relobj->gprmask(); |
| 9705 | cprmask1 |= relobj->cprmask1(); |
| 9706 | cprmask2 |= relobj->cprmask2(); |
| 9707 | cprmask3 |= relobj->cprmask3(); |
| 9708 | cprmask4 |= relobj->cprmask4(); |
| 9709 | } |
| 9710 | |
| 9711 | // Merge processor specific flags. |
| 9712 | Mips_abiflags<big_endian> in_abiflags; |
| 9713 | |
| 9714 | this->create_abiflags(relobj, &in_abiflags); |
| 9715 | this->merge_obj_e_flags(relobj->name(), |
| 9716 | relobj->processor_specific_flags()); |
| 9717 | this->merge_obj_abiflags(relobj->name(), &in_abiflags); |
| 9718 | this->merge_obj_attributes(relobj->name(), |
| 9719 | relobj->attributes_section_data()); |
| 9720 | } |
| 9721 | |
| 9722 | // Create a .gnu.attributes section if we have merged any attributes |
| 9723 | // from inputs. |
| 9724 | if (this->attributes_section_data_ != NULL) |
| 9725 | { |
| 9726 | Output_attributes_section_data* attributes_section = |
| 9727 | new Output_attributes_section_data(*this->attributes_section_data_); |
| 9728 | layout->add_output_section_data(".gnu.attributes", |
| 9729 | elfcpp::SHT_GNU_ATTRIBUTES, 0, |
| 9730 | attributes_section, ORDER_INVALID, false); |
| 9731 | } |
| 9732 | |
| 9733 | // Create .MIPS.abiflags output section if there is an input section. |
| 9734 | if (this->has_abiflags_section_) |
| 9735 | { |
| 9736 | Mips_output_section_abiflags<size, big_endian>* abiflags_section = |
| 9737 | new Mips_output_section_abiflags<size, big_endian>(*this->abiflags_); |
| 9738 | |
| 9739 | Output_section* os = |
| 9740 | layout->add_output_section_data(".MIPS.abiflags", |
| 9741 | elfcpp::SHT_MIPS_ABIFLAGS, |
| 9742 | elfcpp::SHF_ALLOC, |
| 9743 | abiflags_section, ORDER_INVALID, false); |
| 9744 | |
| 9745 | if (!relocatable && os != NULL) |
| 9746 | { |
| 9747 | Output_segment* abiflags_segment = |
| 9748 | layout->make_output_segment(elfcpp::PT_MIPS_ABIFLAGS, elfcpp::PF_R); |
| 9749 | abiflags_segment->add_output_section_to_nonload(os, elfcpp::PF_R); |
| 9750 | } |
| 9751 | } |
| 9752 | |
| 9753 | if (has_reginfo_section && !parameters->options().gc_sections()) |
| 9754 | { |
| 9755 | // Create .reginfo output section. |
| 9756 | Mips_output_section_reginfo<size, big_endian>* reginfo_section = |
| 9757 | new Mips_output_section_reginfo<size, big_endian>(this, gprmask, |
| 9758 | cprmask1, cprmask2, |
| 9759 | cprmask3, cprmask4); |
| 9760 | |
| 9761 | Output_section* os = |
| 9762 | layout->add_output_section_data(".reginfo", elfcpp::SHT_MIPS_REGINFO, |
| 9763 | elfcpp::SHF_ALLOC, reginfo_section, |
| 9764 | ORDER_INVALID, false); |
| 9765 | |
| 9766 | if (!relocatable && os != NULL) |
| 9767 | { |
| 9768 | Output_segment* reginfo_segment = |
| 9769 | layout->make_output_segment(elfcpp::PT_MIPS_REGINFO, |
| 9770 | elfcpp::PF_R); |
| 9771 | reginfo_segment->add_output_section_to_nonload(os, elfcpp::PF_R); |
| 9772 | } |
| 9773 | } |
| 9774 | |
| 9775 | if (this->plt_ != NULL) |
| 9776 | { |
| 9777 | // Set final PLT offsets for symbols. |
| 9778 | this->plt_section()->set_plt_offsets(); |
| 9779 | |
| 9780 | // Define _PROCEDURE_LINKAGE_TABLE_ at the start of the .plt section. |
| 9781 | // Set STO_MICROMIPS flag if the output has microMIPS code, but only if |
| 9782 | // there are no standard PLT entries present. |
| 9783 | unsigned char nonvis = 0; |
| 9784 | if (this->is_output_micromips() |
| 9785 | && !this->plt_section()->has_standard_entries()) |
| 9786 | nonvis = elfcpp::STO_MICROMIPS >> 2; |
| 9787 | symtab->define_in_output_data("_PROCEDURE_LINKAGE_TABLE_", NULL, |
| 9788 | Symbol_table::PREDEFINED, |
| 9789 | this->plt_, |
| 9790 | 0, 0, elfcpp::STT_FUNC, |
| 9791 | elfcpp::STB_LOCAL, |
| 9792 | elfcpp::STV_DEFAULT, nonvis, |
| 9793 | false, false); |
| 9794 | } |
| 9795 | |
| 9796 | if (this->mips_stubs_ != NULL) |
| 9797 | { |
| 9798 | // Define _MIPS_STUBS_ at the start of the .MIPS.stubs section. |
| 9799 | unsigned char nonvis = 0; |
| 9800 | if (this->is_output_micromips()) |
| 9801 | nonvis = elfcpp::STO_MICROMIPS >> 2; |
| 9802 | symtab->define_in_output_data("_MIPS_STUBS_", NULL, |
| 9803 | Symbol_table::PREDEFINED, |
| 9804 | this->mips_stubs_, |
| 9805 | 0, 0, elfcpp::STT_FUNC, |
| 9806 | elfcpp::STB_LOCAL, |
| 9807 | elfcpp::STV_DEFAULT, nonvis, |
| 9808 | false, false); |
| 9809 | } |
| 9810 | |
| 9811 | if (!relocatable && !parameters->doing_static_link()) |
| 9812 | // In case there is no .got section, create one. |
| 9813 | this->got_section(symtab, layout); |
| 9814 | |
| 9815 | // Emit any relocs we saved in an attempt to avoid generating COPY |
| 9816 | // relocs. |
| 9817 | if (this->copy_relocs_.any_saved_relocs()) |
| 9818 | this->copy_relocs_.emit_mips(this->rel_dyn_section(layout), symtab, layout, |
| 9819 | this); |
| 9820 | |
| 9821 | // Set _gp value. |
| 9822 | this->set_gp(layout, symtab); |
| 9823 | |
| 9824 | // Emit dynamic relocs. |
| 9825 | for (typename std::vector<Dyn_reloc>::iterator p = this->dyn_relocs_.begin(); |
| 9826 | p != this->dyn_relocs_.end(); |
| 9827 | ++p) |
| 9828 | p->emit(this->rel_dyn_section(layout), this->got_section(), symtab); |
| 9829 | |
| 9830 | if (this->has_got_section()) |
| 9831 | this->got_section()->lay_out_got(layout, symtab, input_objects); |
| 9832 | |
| 9833 | if (this->mips_stubs_ != NULL) |
| 9834 | this->mips_stubs_->set_needs_dynsym_value(); |
| 9835 | |
| 9836 | // Check for functions that might need $25 to be valid on entry. |
| 9837 | // TODO(sasa): Can we do this without iterating over all symbols? |
| 9838 | typedef Symbol_visitor_check_symbols<size, big_endian> Symbol_visitor; |
| 9839 | symtab->for_all_symbols<size, Symbol_visitor>(Symbol_visitor(this, layout, |
| 9840 | symtab)); |
| 9841 | |
| 9842 | // Add NULL segment. |
| 9843 | if (!relocatable) |
| 9844 | layout->make_output_segment(elfcpp::PT_NULL, 0); |
| 9845 | |
| 9846 | // Fill in some more dynamic tags. |
| 9847 | // TODO(sasa): Add more dynamic tags. |
| 9848 | const Reloc_section* rel_plt = (this->plt_ == NULL |
| 9849 | ? NULL : this->plt_->rel_plt()); |
| 9850 | layout->add_target_dynamic_tags(true, this->got_, rel_plt, |
| 9851 | this->rel_dyn_, true, false); |
| 9852 | |
| 9853 | Output_data_dynamic* const odyn = layout->dynamic_data(); |
| 9854 | if (odyn != NULL |
| 9855 | && !relocatable |
| 9856 | && !parameters->doing_static_link()) |
| 9857 | { |
| 9858 | unsigned int d_val; |
| 9859 | // This element holds a 32-bit version id for the Runtime |
| 9860 | // Linker Interface. This will start at integer value 1. |
| 9861 | d_val = 0x01; |
| 9862 | odyn->add_constant(elfcpp::DT_MIPS_RLD_VERSION, d_val); |
| 9863 | |
| 9864 | // Dynamic flags |
| 9865 | d_val = elfcpp::RHF_NOTPOT; |
| 9866 | odyn->add_constant(elfcpp::DT_MIPS_FLAGS, d_val); |
| 9867 | |
| 9868 | // Save layout for using when emitting custom dynamic tags. |
| 9869 | this->layout_ = layout; |
| 9870 | |
| 9871 | // This member holds the base address of the segment. |
| 9872 | odyn->add_custom(elfcpp::DT_MIPS_BASE_ADDRESS); |
| 9873 | |
| 9874 | // This member holds the number of entries in the .dynsym section. |
| 9875 | odyn->add_custom(elfcpp::DT_MIPS_SYMTABNO); |
| 9876 | |
| 9877 | // This member holds the index of the first dynamic symbol |
| 9878 | // table entry that corresponds to an entry in the global offset table. |
| 9879 | odyn->add_custom(elfcpp::DT_MIPS_GOTSYM); |
| 9880 | |
| 9881 | // This member holds the number of local GOT entries. |
| 9882 | odyn->add_constant(elfcpp::DT_MIPS_LOCAL_GOTNO, |
| 9883 | this->got_->get_local_gotno()); |
| 9884 | |
| 9885 | if (this->plt_ != NULL) |
| 9886 | // DT_MIPS_PLTGOT dynamic tag |
| 9887 | odyn->add_section_address(elfcpp::DT_MIPS_PLTGOT, this->got_plt_); |
| 9888 | |
| 9889 | if (!parameters->options().shared()) |
| 9890 | { |
| 9891 | this->rld_map_ = new Output_data_zero_fill(size / 8, size / 8); |
| 9892 | |
| 9893 | layout->add_output_section_data(".rld_map", elfcpp::SHT_PROGBITS, |
| 9894 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| 9895 | this->rld_map_, ORDER_INVALID, false); |
| 9896 | |
| 9897 | // __RLD_MAP will be filled in by the runtime loader to contain |
| 9898 | // a pointer to the _r_debug structure. |
| 9899 | Symbol* rld_map = symtab->define_in_output_data("__RLD_MAP", NULL, |
| 9900 | Symbol_table::PREDEFINED, |
| 9901 | this->rld_map_, |
| 9902 | 0, 0, elfcpp::STT_OBJECT, |
| 9903 | elfcpp::STB_GLOBAL, |
| 9904 | elfcpp::STV_DEFAULT, 0, |
| 9905 | false, false); |
| 9906 | |
| 9907 | if (!rld_map->is_forced_local()) |
| 9908 | rld_map->set_needs_dynsym_entry(); |
| 9909 | |
| 9910 | if (!parameters->options().pie()) |
| 9911 | // This member holds the absolute address of the debug pointer. |
| 9912 | odyn->add_section_address(elfcpp::DT_MIPS_RLD_MAP, this->rld_map_); |
| 9913 | else |
| 9914 | // This member holds the offset to the debug pointer, |
| 9915 | // relative to the address of the tag. |
| 9916 | odyn->add_custom(elfcpp::DT_MIPS_RLD_MAP_REL); |
| 9917 | } |
| 9918 | } |
| 9919 | } |
| 9920 | |
| 9921 | // Get the custom dynamic tag value. |
| 9922 | template<int size, bool big_endian> |
| 9923 | unsigned int |
| 9924 | Target_mips<size, big_endian>::do_dynamic_tag_custom_value(elfcpp::DT tag) const |
| 9925 | { |
| 9926 | switch (tag) |
| 9927 | { |
| 9928 | case elfcpp::DT_MIPS_BASE_ADDRESS: |
| 9929 | { |
| 9930 | // The base address of the segment. |
| 9931 | // At this point, the segment list has been sorted into final order, |
| 9932 | // so just return vaddr of the first readable PT_LOAD segment. |
| 9933 | Output_segment* seg = |
| 9934 | this->layout_->find_output_segment(elfcpp::PT_LOAD, elfcpp::PF_R, 0); |
| 9935 | gold_assert(seg != NULL); |
| 9936 | return seg->vaddr(); |
| 9937 | } |
| 9938 | |
| 9939 | case elfcpp::DT_MIPS_SYMTABNO: |
| 9940 | // The number of entries in the .dynsym section. |
| 9941 | return this->get_dt_mips_symtabno(); |
| 9942 | |
| 9943 | case elfcpp::DT_MIPS_GOTSYM: |
| 9944 | { |
| 9945 | // The index of the first dynamic symbol table entry that corresponds |
| 9946 | // to an entry in the GOT. |
| 9947 | if (this->got_->first_global_got_dynsym_index() != -1U) |
| 9948 | return this->got_->first_global_got_dynsym_index(); |
| 9949 | else |
| 9950 | // In case if we don't have global GOT symbols we default to setting |
| 9951 | // DT_MIPS_GOTSYM to the same value as DT_MIPS_SYMTABNO. |
| 9952 | return this->get_dt_mips_symtabno(); |
| 9953 | } |
| 9954 | |
| 9955 | case elfcpp::DT_MIPS_RLD_MAP_REL: |
| 9956 | { |
| 9957 | // The MIPS_RLD_MAP_REL tag stores the offset to the debug pointer, |
| 9958 | // relative to the address of the tag. |
| 9959 | Output_data_dynamic* const odyn = this->layout_->dynamic_data(); |
| 9960 | unsigned int entry_offset = |
| 9961 | odyn->get_entry_offset(elfcpp::DT_MIPS_RLD_MAP_REL); |
| 9962 | gold_assert(entry_offset != -1U); |
| 9963 | return this->rld_map_->address() - (odyn->address() + entry_offset); |
| 9964 | } |
| 9965 | default: |
| 9966 | gold_error(_("Unknown dynamic tag 0x%x"), (unsigned int)tag); |
| 9967 | } |
| 9968 | |
| 9969 | return (unsigned int)-1; |
| 9970 | } |
| 9971 | |
| 9972 | // Relocate section data. |
| 9973 | |
| 9974 | template<int size, bool big_endian> |
| 9975 | void |
| 9976 | Target_mips<size, big_endian>::relocate_section( |
| 9977 | const Relocate_info<size, big_endian>* relinfo, |
| 9978 | unsigned int sh_type, |
| 9979 | const unsigned char* prelocs, |
| 9980 | size_t reloc_count, |
| 9981 | Output_section* output_section, |
| 9982 | bool needs_special_offset_handling, |
| 9983 | unsigned char* view, |
| 9984 | Mips_address address, |
| 9985 | section_size_type view_size, |
| 9986 | const Reloc_symbol_changes* reloc_symbol_changes) |
| 9987 | { |
| 9988 | typedef Target_mips<size, big_endian> Mips; |
| 9989 | typedef typename Target_mips<size, big_endian>::Relocate Mips_relocate; |
| 9990 | |
| 9991 | if (sh_type == elfcpp::SHT_REL) |
| 9992 | { |
| 9993 | typedef Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian> |
| 9994 | Classify_reloc; |
| 9995 | |
| 9996 | gold::relocate_section<size, big_endian, Mips, Mips_relocate, |
| 9997 | gold::Default_comdat_behavior, Classify_reloc>( |
| 9998 | relinfo, |
| 9999 | this, |
| 10000 | prelocs, |
| 10001 | reloc_count, |
| 10002 | output_section, |
| 10003 | needs_special_offset_handling, |
| 10004 | view, |
| 10005 | address, |
| 10006 | view_size, |
| 10007 | reloc_symbol_changes); |
| 10008 | } |
| 10009 | else if (sh_type == elfcpp::SHT_RELA) |
| 10010 | { |
| 10011 | typedef Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 10012 | Classify_reloc; |
| 10013 | |
| 10014 | gold::relocate_section<size, big_endian, Mips, Mips_relocate, |
| 10015 | gold::Default_comdat_behavior, Classify_reloc>( |
| 10016 | relinfo, |
| 10017 | this, |
| 10018 | prelocs, |
| 10019 | reloc_count, |
| 10020 | output_section, |
| 10021 | needs_special_offset_handling, |
| 10022 | view, |
| 10023 | address, |
| 10024 | view_size, |
| 10025 | reloc_symbol_changes); |
| 10026 | } |
| 10027 | } |
| 10028 | |
| 10029 | // Return the size of a relocation while scanning during a relocatable |
| 10030 | // link. |
| 10031 | |
| 10032 | unsigned int |
| 10033 | mips_get_size_for_reloc(unsigned int r_type, Relobj* object) |
| 10034 | { |
| 10035 | switch (r_type) |
| 10036 | { |
| 10037 | case elfcpp::R_MIPS_NONE: |
| 10038 | case elfcpp::R_MIPS_TLS_DTPMOD64: |
| 10039 | case elfcpp::R_MIPS_TLS_DTPREL64: |
| 10040 | case elfcpp::R_MIPS_TLS_TPREL64: |
| 10041 | return 0; |
| 10042 | |
| 10043 | case elfcpp::R_MIPS_32: |
| 10044 | case elfcpp::R_MIPS_TLS_DTPMOD32: |
| 10045 | case elfcpp::R_MIPS_TLS_DTPREL32: |
| 10046 | case elfcpp::R_MIPS_TLS_TPREL32: |
| 10047 | case elfcpp::R_MIPS_REL32: |
| 10048 | case elfcpp::R_MIPS_PC32: |
| 10049 | case elfcpp::R_MIPS_GPREL32: |
| 10050 | case elfcpp::R_MIPS_JALR: |
| 10051 | case elfcpp::R_MIPS_EH: |
| 10052 | return 4; |
| 10053 | |
| 10054 | case elfcpp::R_MIPS_16: |
| 10055 | case elfcpp::R_MIPS_HI16: |
| 10056 | case elfcpp::R_MIPS_LO16: |
| 10057 | case elfcpp::R_MIPS_HIGHER: |
| 10058 | case elfcpp::R_MIPS_HIGHEST: |
| 10059 | case elfcpp::R_MIPS_GPREL16: |
| 10060 | case elfcpp::R_MIPS16_HI16: |
| 10061 | case elfcpp::R_MIPS16_LO16: |
| 10062 | case elfcpp::R_MIPS_PC16: |
| 10063 | case elfcpp::R_MIPS_PCHI16: |
| 10064 | case elfcpp::R_MIPS_PCLO16: |
| 10065 | case elfcpp::R_MIPS_GOT16: |
| 10066 | case elfcpp::R_MIPS16_GOT16: |
| 10067 | case elfcpp::R_MIPS_CALL16: |
| 10068 | case elfcpp::R_MIPS16_CALL16: |
| 10069 | case elfcpp::R_MIPS_GOT_HI16: |
| 10070 | case elfcpp::R_MIPS_CALL_HI16: |
| 10071 | case elfcpp::R_MIPS_GOT_LO16: |
| 10072 | case elfcpp::R_MIPS_CALL_LO16: |
| 10073 | case elfcpp::R_MIPS_TLS_DTPREL_HI16: |
| 10074 | case elfcpp::R_MIPS_TLS_DTPREL_LO16: |
| 10075 | case elfcpp::R_MIPS_TLS_TPREL_HI16: |
| 10076 | case elfcpp::R_MIPS_TLS_TPREL_LO16: |
| 10077 | case elfcpp::R_MIPS16_GPREL: |
| 10078 | case elfcpp::R_MIPS_GOT_DISP: |
| 10079 | case elfcpp::R_MIPS_LITERAL: |
| 10080 | case elfcpp::R_MIPS_GOT_PAGE: |
| 10081 | case elfcpp::R_MIPS_GOT_OFST: |
| 10082 | case elfcpp::R_MIPS_TLS_GD: |
| 10083 | case elfcpp::R_MIPS_TLS_LDM: |
| 10084 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 10085 | return 2; |
| 10086 | |
| 10087 | // These relocations are not byte sized |
| 10088 | case elfcpp::R_MIPS_26: |
| 10089 | case elfcpp::R_MIPS16_26: |
| 10090 | case elfcpp::R_MIPS_PC21_S2: |
| 10091 | case elfcpp::R_MIPS_PC26_S2: |
| 10092 | case elfcpp::R_MIPS_PC18_S3: |
| 10093 | case elfcpp::R_MIPS_PC19_S2: |
| 10094 | return 4; |
| 10095 | |
| 10096 | case elfcpp::R_MIPS_COPY: |
| 10097 | case elfcpp::R_MIPS_JUMP_SLOT: |
| 10098 | object->error(_("unexpected reloc %u in object file"), r_type); |
| 10099 | return 0; |
| 10100 | |
| 10101 | default: |
| 10102 | object->error(_("unsupported reloc %u in object file"), r_type); |
| 10103 | return 0; |
| 10104 | } |
| 10105 | } |
| 10106 | |
| 10107 | // Scan the relocs during a relocatable link. |
| 10108 | |
| 10109 | template<int size, bool big_endian> |
| 10110 | void |
| 10111 | Target_mips<size, big_endian>::scan_relocatable_relocs( |
| 10112 | Symbol_table* symtab, |
| 10113 | Layout* layout, |
| 10114 | Sized_relobj_file<size, big_endian>* object, |
| 10115 | unsigned int data_shndx, |
| 10116 | unsigned int sh_type, |
| 10117 | const unsigned char* prelocs, |
| 10118 | size_t reloc_count, |
| 10119 | Output_section* output_section, |
| 10120 | bool needs_special_offset_handling, |
| 10121 | size_t local_symbol_count, |
| 10122 | const unsigned char* plocal_symbols, |
| 10123 | Relocatable_relocs* rr) |
| 10124 | { |
| 10125 | if (sh_type == elfcpp::SHT_REL) |
| 10126 | { |
| 10127 | typedef Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian> |
| 10128 | Classify_reloc; |
| 10129 | typedef Mips_scan_relocatable_relocs<big_endian, Classify_reloc> |
| 10130 | Scan_relocatable_relocs; |
| 10131 | |
| 10132 | gold::scan_relocatable_relocs<size, big_endian, Scan_relocatable_relocs>( |
| 10133 | symtab, |
| 10134 | layout, |
| 10135 | object, |
| 10136 | data_shndx, |
| 10137 | prelocs, |
| 10138 | reloc_count, |
| 10139 | output_section, |
| 10140 | needs_special_offset_handling, |
| 10141 | local_symbol_count, |
| 10142 | plocal_symbols, |
| 10143 | rr); |
| 10144 | } |
| 10145 | else if (sh_type == elfcpp::SHT_RELA) |
| 10146 | { |
| 10147 | typedef Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 10148 | Classify_reloc; |
| 10149 | typedef Mips_scan_relocatable_relocs<big_endian, Classify_reloc> |
| 10150 | Scan_relocatable_relocs; |
| 10151 | |
| 10152 | gold::scan_relocatable_relocs<size, big_endian, Scan_relocatable_relocs>( |
| 10153 | symtab, |
| 10154 | layout, |
| 10155 | object, |
| 10156 | data_shndx, |
| 10157 | prelocs, |
| 10158 | reloc_count, |
| 10159 | output_section, |
| 10160 | needs_special_offset_handling, |
| 10161 | local_symbol_count, |
| 10162 | plocal_symbols, |
| 10163 | rr); |
| 10164 | } |
| 10165 | else |
| 10166 | gold_unreachable(); |
| 10167 | } |
| 10168 | |
| 10169 | // Scan the relocs for --emit-relocs. |
| 10170 | |
| 10171 | template<int size, bool big_endian> |
| 10172 | void |
| 10173 | Target_mips<size, big_endian>::emit_relocs_scan( |
| 10174 | Symbol_table* symtab, |
| 10175 | Layout* layout, |
| 10176 | Sized_relobj_file<size, big_endian>* object, |
| 10177 | unsigned int data_shndx, |
| 10178 | unsigned int sh_type, |
| 10179 | const unsigned char* prelocs, |
| 10180 | size_t reloc_count, |
| 10181 | Output_section* output_section, |
| 10182 | bool needs_special_offset_handling, |
| 10183 | size_t local_symbol_count, |
| 10184 | const unsigned char* plocal_syms, |
| 10185 | Relocatable_relocs* rr) |
| 10186 | { |
| 10187 | if (sh_type == elfcpp::SHT_REL) |
| 10188 | { |
| 10189 | typedef Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian> |
| 10190 | Classify_reloc; |
| 10191 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> |
| 10192 | Emit_relocs_strategy; |
| 10193 | |
| 10194 | gold::scan_relocatable_relocs<size, big_endian, Emit_relocs_strategy>( |
| 10195 | symtab, |
| 10196 | layout, |
| 10197 | object, |
| 10198 | data_shndx, |
| 10199 | prelocs, |
| 10200 | reloc_count, |
| 10201 | output_section, |
| 10202 | needs_special_offset_handling, |
| 10203 | local_symbol_count, |
| 10204 | plocal_syms, |
| 10205 | rr); |
| 10206 | } |
| 10207 | else if (sh_type == elfcpp::SHT_RELA) |
| 10208 | { |
| 10209 | typedef Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 10210 | Classify_reloc; |
| 10211 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> |
| 10212 | Emit_relocs_strategy; |
| 10213 | |
| 10214 | gold::scan_relocatable_relocs<size, big_endian, Emit_relocs_strategy>( |
| 10215 | symtab, |
| 10216 | layout, |
| 10217 | object, |
| 10218 | data_shndx, |
| 10219 | prelocs, |
| 10220 | reloc_count, |
| 10221 | output_section, |
| 10222 | needs_special_offset_handling, |
| 10223 | local_symbol_count, |
| 10224 | plocal_syms, |
| 10225 | rr); |
| 10226 | } |
| 10227 | else |
| 10228 | gold_unreachable(); |
| 10229 | } |
| 10230 | |
| 10231 | // Emit relocations for a section. |
| 10232 | |
| 10233 | template<int size, bool big_endian> |
| 10234 | void |
| 10235 | Target_mips<size, big_endian>::relocate_relocs( |
| 10236 | const Relocate_info<size, big_endian>* relinfo, |
| 10237 | unsigned int sh_type, |
| 10238 | const unsigned char* prelocs, |
| 10239 | size_t reloc_count, |
| 10240 | Output_section* output_section, |
| 10241 | typename elfcpp::Elf_types<size>::Elf_Off |
| 10242 | offset_in_output_section, |
| 10243 | unsigned char* view, |
| 10244 | Mips_address view_address, |
| 10245 | section_size_type view_size, |
| 10246 | unsigned char* reloc_view, |
| 10247 | section_size_type reloc_view_size) |
| 10248 | { |
| 10249 | if (sh_type == elfcpp::SHT_REL) |
| 10250 | { |
| 10251 | typedef Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian> |
| 10252 | Classify_reloc; |
| 10253 | |
| 10254 | gold::relocate_relocs<size, big_endian, Classify_reloc>( |
| 10255 | relinfo, |
| 10256 | prelocs, |
| 10257 | reloc_count, |
| 10258 | output_section, |
| 10259 | offset_in_output_section, |
| 10260 | view, |
| 10261 | view_address, |
| 10262 | view_size, |
| 10263 | reloc_view, |
| 10264 | reloc_view_size); |
| 10265 | } |
| 10266 | else if (sh_type == elfcpp::SHT_RELA) |
| 10267 | { |
| 10268 | typedef Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian> |
| 10269 | Classify_reloc; |
| 10270 | |
| 10271 | gold::relocate_relocs<size, big_endian, Classify_reloc>( |
| 10272 | relinfo, |
| 10273 | prelocs, |
| 10274 | reloc_count, |
| 10275 | output_section, |
| 10276 | offset_in_output_section, |
| 10277 | view, |
| 10278 | view_address, |
| 10279 | view_size, |
| 10280 | reloc_view, |
| 10281 | reloc_view_size); |
| 10282 | } |
| 10283 | else |
| 10284 | gold_unreachable(); |
| 10285 | } |
| 10286 | |
| 10287 | // Perform target-specific processing in a relocatable link. This is |
| 10288 | // only used if we use the relocation strategy RELOC_SPECIAL. |
| 10289 | |
| 10290 | template<int size, bool big_endian> |
| 10291 | void |
| 10292 | Target_mips<size, big_endian>::relocate_special_relocatable( |
| 10293 | const Relocate_info<size, big_endian>* relinfo, |
| 10294 | unsigned int sh_type, |
| 10295 | const unsigned char* preloc_in, |
| 10296 | size_t relnum, |
| 10297 | Output_section* output_section, |
| 10298 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 10299 | unsigned char* view, |
| 10300 | Mips_address view_address, |
| 10301 | section_size_type, |
| 10302 | unsigned char* preloc_out) |
| 10303 | { |
| 10304 | // We can only handle REL type relocation sections. |
| 10305 | gold_assert(sh_type == elfcpp::SHT_REL); |
| 10306 | |
| 10307 | typedef typename Reloc_types<elfcpp::SHT_REL, size, big_endian>::Reloc |
| 10308 | Reltype; |
| 10309 | typedef typename Reloc_types<elfcpp::SHT_REL, size, big_endian>::Reloc_write |
| 10310 | Reltype_write; |
| 10311 | |
| 10312 | typedef Mips_relocate_functions<size, big_endian> Reloc_funcs; |
| 10313 | |
| 10314 | const Mips_address invalid_address = static_cast<Mips_address>(0) - 1; |
| 10315 | |
| 10316 | Mips_relobj<size, big_endian>* object = |
| 10317 | Mips_relobj<size, big_endian>::as_mips_relobj(relinfo->object); |
| 10318 | const unsigned int local_count = object->local_symbol_count(); |
| 10319 | |
| 10320 | Reltype reloc(preloc_in); |
| 10321 | Reltype_write reloc_write(preloc_out); |
| 10322 | |
| 10323 | elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info(); |
| 10324 | const unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 10325 | const unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 10326 | |
| 10327 | // Get the new symbol index. |
| 10328 | // We only use RELOC_SPECIAL strategy in local relocations. |
| 10329 | gold_assert(r_sym < local_count); |
| 10330 | |
| 10331 | // We are adjusting a section symbol. We need to find |
| 10332 | // the symbol table index of the section symbol for |
| 10333 | // the output section corresponding to input section |
| 10334 | // in which this symbol is defined. |
| 10335 | bool is_ordinary; |
| 10336 | unsigned int shndx = object->local_symbol_input_shndx(r_sym, &is_ordinary); |
| 10337 | gold_assert(is_ordinary); |
| 10338 | Output_section* os = object->output_section(shndx); |
| 10339 | gold_assert(os != NULL); |
| 10340 | gold_assert(os->needs_symtab_index()); |
| 10341 | unsigned int new_symndx = os->symtab_index(); |
| 10342 | |
| 10343 | // Get the new offset--the location in the output section where |
| 10344 | // this relocation should be applied. |
| 10345 | |
| 10346 | Mips_address offset = reloc.get_r_offset(); |
| 10347 | Mips_address new_offset; |
| 10348 | if (offset_in_output_section != invalid_address) |
| 10349 | new_offset = offset + offset_in_output_section; |
| 10350 | else |
| 10351 | { |
| 10352 | section_offset_type sot_offset = |
| 10353 | convert_types<section_offset_type, Mips_address>(offset); |
| 10354 | section_offset_type new_sot_offset = |
| 10355 | output_section->output_offset(object, relinfo->data_shndx, |
| 10356 | sot_offset); |
| 10357 | gold_assert(new_sot_offset != -1); |
| 10358 | new_offset = new_sot_offset; |
| 10359 | } |
| 10360 | |
| 10361 | // In an object file, r_offset is an offset within the section. |
| 10362 | // In an executable or dynamic object, generated by |
| 10363 | // --emit-relocs, r_offset is an absolute address. |
| 10364 | if (!parameters->options().relocatable()) |
| 10365 | { |
| 10366 | new_offset += view_address; |
| 10367 | if (offset_in_output_section != invalid_address) |
| 10368 | new_offset -= offset_in_output_section; |
| 10369 | } |
| 10370 | |
| 10371 | reloc_write.put_r_offset(new_offset); |
| 10372 | reloc_write.put_r_info(elfcpp::elf_r_info<32>(new_symndx, r_type)); |
| 10373 | |
| 10374 | // Handle the reloc addend. |
| 10375 | // The relocation uses a section symbol in the input file. |
| 10376 | // We are adjusting it to use a section symbol in the output |
| 10377 | // file. The input section symbol refers to some address in |
| 10378 | // the input section. We need the relocation in the output |
| 10379 | // file to refer to that same address. This adjustment to |
| 10380 | // the addend is the same calculation we use for a simple |
| 10381 | // absolute relocation for the input section symbol. |
| 10382 | Valtype calculated_value = 0; |
| 10383 | const Symbol_value<size>* psymval = object->local_symbol(r_sym); |
| 10384 | |
| 10385 | unsigned char* paddend = view + offset; |
| 10386 | typename Reloc_funcs::Status reloc_status = Reloc_funcs::STATUS_OKAY; |
| 10387 | switch (r_type) |
| 10388 | { |
| 10389 | case elfcpp::R_MIPS_26: |
| 10390 | reloc_status = Reloc_funcs::rel26(paddend, object, psymval, |
| 10391 | offset_in_output_section, true, 0, sh_type == elfcpp::SHT_REL, NULL, |
| 10392 | false /*TODO(sasa): cross mode jump*/, r_type, this->jal_to_bal(), |
| 10393 | false, &calculated_value); |
| 10394 | break; |
| 10395 | |
| 10396 | default: |
| 10397 | gold_unreachable(); |
| 10398 | } |
| 10399 | |
| 10400 | // Report any errors. |
| 10401 | switch (reloc_status) |
| 10402 | { |
| 10403 | case Reloc_funcs::STATUS_OKAY: |
| 10404 | break; |
| 10405 | case Reloc_funcs::STATUS_OVERFLOW: |
| 10406 | gold_error_at_location(relinfo, relnum, reloc.get_r_offset(), |
| 10407 | _("relocation overflow: " |
| 10408 | "%u against local symbol %u in %s"), |
| 10409 | r_type, r_sym, object->name().c_str()); |
| 10410 | break; |
| 10411 | case Reloc_funcs::STATUS_BAD_RELOC: |
| 10412 | gold_error_at_location(relinfo, relnum, reloc.get_r_offset(), |
| 10413 | _("unexpected opcode while processing relocation")); |
| 10414 | break; |
| 10415 | default: |
| 10416 | gold_unreachable(); |
| 10417 | } |
| 10418 | } |
| 10419 | |
| 10420 | // Optimize the TLS relocation type based on what we know about the |
| 10421 | // symbol. IS_FINAL is true if the final address of this symbol is |
| 10422 | // known at link time. |
| 10423 | |
| 10424 | template<int size, bool big_endian> |
| 10425 | tls::Tls_optimization |
| 10426 | Target_mips<size, big_endian>::optimize_tls_reloc(bool, int) |
| 10427 | { |
| 10428 | // FIXME: Currently we do not do any TLS optimization. |
| 10429 | return tls::TLSOPT_NONE; |
| 10430 | } |
| 10431 | |
| 10432 | // Scan a relocation for a local symbol. |
| 10433 | |
| 10434 | template<int size, bool big_endian> |
| 10435 | inline void |
| 10436 | Target_mips<size, big_endian>::Scan::local( |
| 10437 | Symbol_table* symtab, |
| 10438 | Layout* layout, |
| 10439 | Target_mips<size, big_endian>* target, |
| 10440 | Sized_relobj_file<size, big_endian>* object, |
| 10441 | unsigned int data_shndx, |
| 10442 | Output_section* output_section, |
| 10443 | const Relatype* rela, |
| 10444 | const Reltype* rel, |
| 10445 | unsigned int rel_type, |
| 10446 | unsigned int r_type, |
| 10447 | const elfcpp::Sym<size, big_endian>& lsym, |
| 10448 | bool is_discarded) |
| 10449 | { |
| 10450 | if (is_discarded) |
| 10451 | return; |
| 10452 | |
| 10453 | Mips_address r_offset; |
| 10454 | unsigned int r_sym; |
| 10455 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend; |
| 10456 | |
| 10457 | if (rel_type == elfcpp::SHT_RELA) |
| 10458 | { |
| 10459 | r_offset = rela->get_r_offset(); |
| 10460 | r_sym = Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 10461 | get_r_sym(rela); |
| 10462 | r_addend = rela->get_r_addend(); |
| 10463 | } |
| 10464 | else |
| 10465 | { |
| 10466 | r_offset = rel->get_r_offset(); |
| 10467 | r_sym = Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian>:: |
| 10468 | get_r_sym(rel); |
| 10469 | r_addend = 0; |
| 10470 | } |
| 10471 | |
| 10472 | Mips_relobj<size, big_endian>* mips_obj = |
| 10473 | Mips_relobj<size, big_endian>::as_mips_relobj(object); |
| 10474 | |
| 10475 | if (mips_obj->is_mips16_stub_section(data_shndx)) |
| 10476 | { |
| 10477 | mips_obj->get_mips16_stub_section(data_shndx) |
| 10478 | ->new_local_reloc_found(r_type, r_sym); |
| 10479 | } |
| 10480 | |
| 10481 | if (r_type == elfcpp::R_MIPS_NONE) |
| 10482 | // R_MIPS_NONE is used in mips16 stub sections, to define the target of the |
| 10483 | // mips16 stub. |
| 10484 | return; |
| 10485 | |
| 10486 | if (!mips16_call_reloc(r_type) |
| 10487 | && !mips_obj->section_allows_mips16_refs(data_shndx)) |
| 10488 | // This reloc would need to refer to a MIPS16 hard-float stub, if |
| 10489 | // there is one. We ignore MIPS16 stub sections and .pdr section when |
| 10490 | // looking for relocs that would need to refer to MIPS16 stubs. |
| 10491 | mips_obj->add_local_non_16bit_call(r_sym); |
| 10492 | |
| 10493 | if (r_type == elfcpp::R_MIPS16_26 |
| 10494 | && !mips_obj->section_allows_mips16_refs(data_shndx)) |
| 10495 | mips_obj->add_local_16bit_call(r_sym); |
| 10496 | |
| 10497 | switch (r_type) |
| 10498 | { |
| 10499 | case elfcpp::R_MIPS_GOT16: |
| 10500 | case elfcpp::R_MIPS_CALL16: |
| 10501 | case elfcpp::R_MIPS_CALL_HI16: |
| 10502 | case elfcpp::R_MIPS_CALL_LO16: |
| 10503 | case elfcpp::R_MIPS_GOT_HI16: |
| 10504 | case elfcpp::R_MIPS_GOT_LO16: |
| 10505 | case elfcpp::R_MIPS_GOT_PAGE: |
| 10506 | case elfcpp::R_MIPS_GOT_OFST: |
| 10507 | case elfcpp::R_MIPS_GOT_DISP: |
| 10508 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 10509 | case elfcpp::R_MIPS_TLS_GD: |
| 10510 | case elfcpp::R_MIPS_TLS_LDM: |
| 10511 | case elfcpp::R_MIPS16_GOT16: |
| 10512 | case elfcpp::R_MIPS16_CALL16: |
| 10513 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 10514 | case elfcpp::R_MIPS16_TLS_GD: |
| 10515 | case elfcpp::R_MIPS16_TLS_LDM: |
| 10516 | case elfcpp::R_MICROMIPS_GOT16: |
| 10517 | case elfcpp::R_MICROMIPS_CALL16: |
| 10518 | case elfcpp::R_MICROMIPS_CALL_HI16: |
| 10519 | case elfcpp::R_MICROMIPS_CALL_LO16: |
| 10520 | case elfcpp::R_MICROMIPS_GOT_HI16: |
| 10521 | case elfcpp::R_MICROMIPS_GOT_LO16: |
| 10522 | case elfcpp::R_MICROMIPS_GOT_PAGE: |
| 10523 | case elfcpp::R_MICROMIPS_GOT_OFST: |
| 10524 | case elfcpp::R_MICROMIPS_GOT_DISP: |
| 10525 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 10526 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 10527 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 10528 | case elfcpp::R_MIPS_EH: |
| 10529 | // We need a GOT section. |
| 10530 | target->got_section(symtab, layout); |
| 10531 | break; |
| 10532 | |
| 10533 | default: |
| 10534 | break; |
| 10535 | } |
| 10536 | |
| 10537 | if (call_lo16_reloc(r_type) |
| 10538 | || got_lo16_reloc(r_type) |
| 10539 | || got_disp_reloc(r_type) |
| 10540 | || eh_reloc(r_type)) |
| 10541 | { |
| 10542 | // We may need a local GOT entry for this relocation. We |
| 10543 | // don't count R_MIPS_GOT_PAGE because we can estimate the |
| 10544 | // maximum number of pages needed by looking at the size of |
| 10545 | // the segment. Similar comments apply to R_MIPS*_GOT16 and |
| 10546 | // R_MIPS*_CALL16. We don't count R_MIPS_GOT_HI16, or |
| 10547 | // R_MIPS_CALL_HI16 because these are always followed by an |
| 10548 | // R_MIPS_GOT_LO16 or R_MIPS_CALL_LO16. |
| 10549 | Mips_output_data_got<size, big_endian>* got = |
| 10550 | target->got_section(symtab, layout); |
| 10551 | bool is_section_symbol = lsym.get_st_type() == elfcpp::STT_SECTION; |
| 10552 | got->record_local_got_symbol(mips_obj, r_sym, r_addend, r_type, -1U, |
| 10553 | is_section_symbol); |
| 10554 | } |
| 10555 | |
| 10556 | switch (r_type) |
| 10557 | { |
| 10558 | case elfcpp::R_MIPS_CALL16: |
| 10559 | case elfcpp::R_MIPS16_CALL16: |
| 10560 | case elfcpp::R_MICROMIPS_CALL16: |
| 10561 | gold_error(_("CALL16 reloc at 0x%lx not against global symbol "), |
| 10562 | (unsigned long)r_offset); |
| 10563 | return; |
| 10564 | |
| 10565 | case elfcpp::R_MIPS_GOT_PAGE: |
| 10566 | case elfcpp::R_MICROMIPS_GOT_PAGE: |
| 10567 | case elfcpp::R_MIPS16_GOT16: |
| 10568 | case elfcpp::R_MIPS_GOT16: |
| 10569 | case elfcpp::R_MIPS_GOT_HI16: |
| 10570 | case elfcpp::R_MIPS_GOT_LO16: |
| 10571 | case elfcpp::R_MICROMIPS_GOT16: |
| 10572 | case elfcpp::R_MICROMIPS_GOT_HI16: |
| 10573 | case elfcpp::R_MICROMIPS_GOT_LO16: |
| 10574 | { |
| 10575 | // This relocation needs a page entry in the GOT. |
| 10576 | // Get the section contents. |
| 10577 | section_size_type view_size = 0; |
| 10578 | const unsigned char* view = object->section_contents(data_shndx, |
| 10579 | &view_size, false); |
| 10580 | view += r_offset; |
| 10581 | |
| 10582 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); |
| 10583 | Valtype32 addend = (rel_type == elfcpp::SHT_REL ? val & 0xffff |
| 10584 | : r_addend); |
| 10585 | |
| 10586 | if (rel_type == elfcpp::SHT_REL && got16_reloc(r_type)) |
| 10587 | target->got16_addends_.push_back(got16_addend<size, big_endian>( |
| 10588 | object, data_shndx, r_type, r_sym, addend)); |
| 10589 | else |
| 10590 | target->got_section()->record_got_page_entry(mips_obj, r_sym, addend); |
| 10591 | break; |
| 10592 | } |
| 10593 | |
| 10594 | case elfcpp::R_MIPS_HI16: |
| 10595 | case elfcpp::R_MIPS_PCHI16: |
| 10596 | case elfcpp::R_MIPS16_HI16: |
| 10597 | case elfcpp::R_MICROMIPS_HI16: |
| 10598 | // Record the reloc so that we can check whether the corresponding LO16 |
| 10599 | // part exists. |
| 10600 | if (rel_type == elfcpp::SHT_REL) |
| 10601 | target->got16_addends_.push_back(got16_addend<size, big_endian>( |
| 10602 | object, data_shndx, r_type, r_sym, 0)); |
| 10603 | break; |
| 10604 | |
| 10605 | case elfcpp::R_MIPS_LO16: |
| 10606 | case elfcpp::R_MIPS_PCLO16: |
| 10607 | case elfcpp::R_MIPS16_LO16: |
| 10608 | case elfcpp::R_MICROMIPS_LO16: |
| 10609 | { |
| 10610 | if (rel_type != elfcpp::SHT_REL) |
| 10611 | break; |
| 10612 | |
| 10613 | // Find corresponding GOT16/HI16 relocation. |
| 10614 | |
| 10615 | // According to the MIPS ELF ABI, the R_MIPS_LO16 relocation must |
| 10616 | // be immediately following. However, for the IRIX6 ABI, the next |
| 10617 | // relocation may be a composed relocation consisting of several |
| 10618 | // relocations for the same address. In that case, the R_MIPS_LO16 |
| 10619 | // relocation may occur as one of these. We permit a similar |
| 10620 | // extension in general, as that is useful for GCC. |
| 10621 | |
| 10622 | // In some cases GCC dead code elimination removes the LO16 but |
| 10623 | // keeps the corresponding HI16. This is strictly speaking a |
| 10624 | // violation of the ABI but not immediately harmful. |
| 10625 | |
| 10626 | typename std::list<got16_addend<size, big_endian> >::iterator it = |
| 10627 | target->got16_addends_.begin(); |
| 10628 | while (it != target->got16_addends_.end()) |
| 10629 | { |
| 10630 | got16_addend<size, big_endian> _got16_addend = *it; |
| 10631 | |
| 10632 | // TODO(sasa): Split got16_addends_ list into two lists - one for |
| 10633 | // GOT16 relocs and the other for HI16 relocs. |
| 10634 | |
| 10635 | // Report an error if we find HI16 or GOT16 reloc from the |
| 10636 | // previous section without the matching LO16 part. |
| 10637 | if (_got16_addend.object != object |
| 10638 | || _got16_addend.shndx != data_shndx) |
| 10639 | { |
| 10640 | gold_error("Can't find matching LO16 reloc"); |
| 10641 | break; |
| 10642 | } |
| 10643 | |
| 10644 | if (_got16_addend.r_sym != r_sym |
| 10645 | || !is_matching_lo16_reloc(_got16_addend.r_type, r_type)) |
| 10646 | { |
| 10647 | ++it; |
| 10648 | continue; |
| 10649 | } |
| 10650 | |
| 10651 | // We found a matching HI16 or GOT16 reloc for this LO16 reloc. |
| 10652 | // For GOT16, we need to calculate combined addend and record GOT page |
| 10653 | // entry. |
| 10654 | if (got16_reloc(_got16_addend.r_type)) |
| 10655 | { |
| 10656 | |
| 10657 | section_size_type view_size = 0; |
| 10658 | const unsigned char* view = object->section_contents(data_shndx, |
| 10659 | &view_size, |
| 10660 | false); |
| 10661 | view += r_offset; |
| 10662 | |
| 10663 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); |
| 10664 | int32_t addend = Bits<16>::sign_extend32(val & 0xffff); |
| 10665 | |
| 10666 | addend = (_got16_addend.addend << 16) + addend; |
| 10667 | target->got_section()->record_got_page_entry(mips_obj, r_sym, |
| 10668 | addend); |
| 10669 | } |
| 10670 | |
| 10671 | it = target->got16_addends_.erase(it); |
| 10672 | } |
| 10673 | break; |
| 10674 | } |
| 10675 | } |
| 10676 | |
| 10677 | switch (r_type) |
| 10678 | { |
| 10679 | case elfcpp::R_MIPS_32: |
| 10680 | case elfcpp::R_MIPS_REL32: |
| 10681 | case elfcpp::R_MIPS_64: |
| 10682 | { |
| 10683 | if (parameters->options().output_is_position_independent()) |
| 10684 | { |
| 10685 | // If building a shared library (or a position-independent |
| 10686 | // executable), we need to create a dynamic relocation for |
| 10687 | // this location. |
| 10688 | if (is_readonly_section(output_section)) |
| 10689 | break; |
| 10690 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
| 10691 | rel_dyn->add_symbolless_local_addend(object, r_sym, |
| 10692 | elfcpp::R_MIPS_REL32, |
| 10693 | output_section, data_shndx, |
| 10694 | r_offset); |
| 10695 | } |
| 10696 | break; |
| 10697 | } |
| 10698 | |
| 10699 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 10700 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 10701 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 10702 | case elfcpp::R_MIPS_TLS_LDM: |
| 10703 | case elfcpp::R_MIPS16_TLS_LDM: |
| 10704 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 10705 | case elfcpp::R_MIPS_TLS_GD: |
| 10706 | case elfcpp::R_MIPS16_TLS_GD: |
| 10707 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 10708 | { |
| 10709 | bool output_is_shared = parameters->options().shared(); |
| 10710 | const tls::Tls_optimization optimized_type |
| 10711 | = Target_mips<size, big_endian>::optimize_tls_reloc( |
| 10712 | !output_is_shared, r_type); |
| 10713 | switch (r_type) |
| 10714 | { |
| 10715 | case elfcpp::R_MIPS_TLS_GD: |
| 10716 | case elfcpp::R_MIPS16_TLS_GD: |
| 10717 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 10718 | if (optimized_type == tls::TLSOPT_NONE) |
| 10719 | { |
| 10720 | // Create a pair of GOT entries for the module index and |
| 10721 | // dtv-relative offset. |
| 10722 | Mips_output_data_got<size, big_endian>* got = |
| 10723 | target->got_section(symtab, layout); |
| 10724 | unsigned int shndx = lsym.get_st_shndx(); |
| 10725 | bool is_ordinary; |
| 10726 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); |
| 10727 | if (!is_ordinary) |
| 10728 | { |
| 10729 | object->error(_("local symbol %u has bad shndx %u"), |
| 10730 | r_sym, shndx); |
| 10731 | break; |
| 10732 | } |
| 10733 | got->record_local_got_symbol(mips_obj, r_sym, r_addend, r_type, |
| 10734 | shndx, false); |
| 10735 | } |
| 10736 | else |
| 10737 | { |
| 10738 | // FIXME: TLS optimization not supported yet. |
| 10739 | gold_unreachable(); |
| 10740 | } |
| 10741 | break; |
| 10742 | |
| 10743 | case elfcpp::R_MIPS_TLS_LDM: |
| 10744 | case elfcpp::R_MIPS16_TLS_LDM: |
| 10745 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 10746 | if (optimized_type == tls::TLSOPT_NONE) |
| 10747 | { |
| 10748 | // We always record LDM symbols as local with index 0. |
| 10749 | target->got_section()->record_local_got_symbol(mips_obj, 0, |
| 10750 | r_addend, r_type, |
| 10751 | -1U, false); |
| 10752 | } |
| 10753 | else |
| 10754 | { |
| 10755 | // FIXME: TLS optimization not supported yet. |
| 10756 | gold_unreachable(); |
| 10757 | } |
| 10758 | break; |
| 10759 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 10760 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 10761 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 10762 | layout->set_has_static_tls(); |
| 10763 | if (optimized_type == tls::TLSOPT_NONE) |
| 10764 | { |
| 10765 | // Create a GOT entry for the tp-relative offset. |
| 10766 | Mips_output_data_got<size, big_endian>* got = |
| 10767 | target->got_section(symtab, layout); |
| 10768 | got->record_local_got_symbol(mips_obj, r_sym, r_addend, r_type, |
| 10769 | -1U, false); |
| 10770 | } |
| 10771 | else |
| 10772 | { |
| 10773 | // FIXME: TLS optimization not supported yet. |
| 10774 | gold_unreachable(); |
| 10775 | } |
| 10776 | break; |
| 10777 | |
| 10778 | default: |
| 10779 | gold_unreachable(); |
| 10780 | } |
| 10781 | } |
| 10782 | break; |
| 10783 | |
| 10784 | default: |
| 10785 | break; |
| 10786 | } |
| 10787 | |
| 10788 | // Refuse some position-dependent relocations when creating a |
| 10789 | // shared library. Do not refuse R_MIPS_32 / R_MIPS_64; they're |
| 10790 | // not PIC, but we can create dynamic relocations and the result |
| 10791 | // will be fine. Also do not refuse R_MIPS_LO16, which can be |
| 10792 | // combined with R_MIPS_GOT16. |
| 10793 | if (parameters->options().shared()) |
| 10794 | { |
| 10795 | switch (r_type) |
| 10796 | { |
| 10797 | case elfcpp::R_MIPS16_HI16: |
| 10798 | case elfcpp::R_MIPS_HI16: |
| 10799 | case elfcpp::R_MIPS_HIGHER: |
| 10800 | case elfcpp::R_MIPS_HIGHEST: |
| 10801 | case elfcpp::R_MICROMIPS_HI16: |
| 10802 | case elfcpp::R_MICROMIPS_HIGHER: |
| 10803 | case elfcpp::R_MICROMIPS_HIGHEST: |
| 10804 | // Don't refuse a high part relocation if it's against |
| 10805 | // no symbol (e.g. part of a compound relocation). |
| 10806 | if (r_sym == 0) |
| 10807 | break; |
| 10808 | // Fall through. |
| 10809 | |
| 10810 | case elfcpp::R_MIPS16_26: |
| 10811 | case elfcpp::R_MIPS_26: |
| 10812 | case elfcpp::R_MICROMIPS_26_S1: |
| 10813 | gold_error(_("%s: relocation %u against `%s' can not be used when " |
| 10814 | "making a shared object; recompile with -fPIC"), |
| 10815 | object->name().c_str(), r_type, "a local symbol"); |
| 10816 | default: |
| 10817 | break; |
| 10818 | } |
| 10819 | } |
| 10820 | } |
| 10821 | |
| 10822 | template<int size, bool big_endian> |
| 10823 | inline void |
| 10824 | Target_mips<size, big_endian>::Scan::local( |
| 10825 | Symbol_table* symtab, |
| 10826 | Layout* layout, |
| 10827 | Target_mips<size, big_endian>* target, |
| 10828 | Sized_relobj_file<size, big_endian>* object, |
| 10829 | unsigned int data_shndx, |
| 10830 | Output_section* output_section, |
| 10831 | const Reltype& reloc, |
| 10832 | unsigned int r_type, |
| 10833 | const elfcpp::Sym<size, big_endian>& lsym, |
| 10834 | bool is_discarded) |
| 10835 | { |
| 10836 | if (is_discarded) |
| 10837 | return; |
| 10838 | |
| 10839 | local( |
| 10840 | symtab, |
| 10841 | layout, |
| 10842 | target, |
| 10843 | object, |
| 10844 | data_shndx, |
| 10845 | output_section, |
| 10846 | (const Relatype*) NULL, |
| 10847 | &reloc, |
| 10848 | elfcpp::SHT_REL, |
| 10849 | r_type, |
| 10850 | lsym, is_discarded); |
| 10851 | } |
| 10852 | |
| 10853 | |
| 10854 | template<int size, bool big_endian> |
| 10855 | inline void |
| 10856 | Target_mips<size, big_endian>::Scan::local( |
| 10857 | Symbol_table* symtab, |
| 10858 | Layout* layout, |
| 10859 | Target_mips<size, big_endian>* target, |
| 10860 | Sized_relobj_file<size, big_endian>* object, |
| 10861 | unsigned int data_shndx, |
| 10862 | Output_section* output_section, |
| 10863 | const Relatype& reloc, |
| 10864 | unsigned int r_type, |
| 10865 | const elfcpp::Sym<size, big_endian>& lsym, |
| 10866 | bool is_discarded) |
| 10867 | { |
| 10868 | if (is_discarded) |
| 10869 | return; |
| 10870 | |
| 10871 | local( |
| 10872 | symtab, |
| 10873 | layout, |
| 10874 | target, |
| 10875 | object, |
| 10876 | data_shndx, |
| 10877 | output_section, |
| 10878 | &reloc, |
| 10879 | (const Reltype*) NULL, |
| 10880 | elfcpp::SHT_RELA, |
| 10881 | r_type, |
| 10882 | lsym, is_discarded); |
| 10883 | } |
| 10884 | |
| 10885 | // Scan a relocation for a global symbol. |
| 10886 | |
| 10887 | template<int size, bool big_endian> |
| 10888 | inline void |
| 10889 | Target_mips<size, big_endian>::Scan::global( |
| 10890 | Symbol_table* symtab, |
| 10891 | Layout* layout, |
| 10892 | Target_mips<size, big_endian>* target, |
| 10893 | Sized_relobj_file<size, big_endian>* object, |
| 10894 | unsigned int data_shndx, |
| 10895 | Output_section* output_section, |
| 10896 | const Relatype* rela, |
| 10897 | const Reltype* rel, |
| 10898 | unsigned int rel_type, |
| 10899 | unsigned int r_type, |
| 10900 | Symbol* gsym) |
| 10901 | { |
| 10902 | Mips_address r_offset; |
| 10903 | unsigned int r_sym; |
| 10904 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend; |
| 10905 | |
| 10906 | if (rel_type == elfcpp::SHT_RELA) |
| 10907 | { |
| 10908 | r_offset = rela->get_r_offset(); |
| 10909 | r_sym = Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 10910 | get_r_sym(rela); |
| 10911 | r_addend = rela->get_r_addend(); |
| 10912 | } |
| 10913 | else |
| 10914 | { |
| 10915 | r_offset = rel->get_r_offset(); |
| 10916 | r_sym = Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian>:: |
| 10917 | get_r_sym(rel); |
| 10918 | r_addend = 0; |
| 10919 | } |
| 10920 | |
| 10921 | Mips_relobj<size, big_endian>* mips_obj = |
| 10922 | Mips_relobj<size, big_endian>::as_mips_relobj(object); |
| 10923 | Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(gsym); |
| 10924 | |
| 10925 | if (mips_obj->is_mips16_stub_section(data_shndx)) |
| 10926 | { |
| 10927 | mips_obj->get_mips16_stub_section(data_shndx) |
| 10928 | ->new_global_reloc_found(r_type, mips_sym); |
| 10929 | } |
| 10930 | |
| 10931 | if (r_type == elfcpp::R_MIPS_NONE) |
| 10932 | // R_MIPS_NONE is used in mips16 stub sections, to define the target of the |
| 10933 | // mips16 stub. |
| 10934 | return; |
| 10935 | |
| 10936 | if (!mips16_call_reloc(r_type) |
| 10937 | && !mips_obj->section_allows_mips16_refs(data_shndx)) |
| 10938 | // This reloc would need to refer to a MIPS16 hard-float stub, if |
| 10939 | // there is one. We ignore MIPS16 stub sections and .pdr section when |
| 10940 | // looking for relocs that would need to refer to MIPS16 stubs. |
| 10941 | mips_sym->set_need_fn_stub(); |
| 10942 | |
| 10943 | // We need PLT entries if there are static-only relocations against |
| 10944 | // an externally-defined function. This can technically occur for |
| 10945 | // shared libraries if there are branches to the symbol, although it |
| 10946 | // is unlikely that this will be used in practice due to the short |
| 10947 | // ranges involved. It can occur for any relative or absolute relocation |
| 10948 | // in executables; in that case, the PLT entry becomes the function's |
| 10949 | // canonical address. |
| 10950 | bool static_reloc = false; |
| 10951 | |
| 10952 | // Set CAN_MAKE_DYNAMIC to true if we can convert this |
| 10953 | // relocation into a dynamic one. |
| 10954 | bool can_make_dynamic = false; |
| 10955 | switch (r_type) |
| 10956 | { |
| 10957 | case elfcpp::R_MIPS_GOT16: |
| 10958 | case elfcpp::R_MIPS_CALL16: |
| 10959 | case elfcpp::R_MIPS_CALL_HI16: |
| 10960 | case elfcpp::R_MIPS_CALL_LO16: |
| 10961 | case elfcpp::R_MIPS_GOT_HI16: |
| 10962 | case elfcpp::R_MIPS_GOT_LO16: |
| 10963 | case elfcpp::R_MIPS_GOT_PAGE: |
| 10964 | case elfcpp::R_MIPS_GOT_OFST: |
| 10965 | case elfcpp::R_MIPS_GOT_DISP: |
| 10966 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 10967 | case elfcpp::R_MIPS_TLS_GD: |
| 10968 | case elfcpp::R_MIPS_TLS_LDM: |
| 10969 | case elfcpp::R_MIPS16_GOT16: |
| 10970 | case elfcpp::R_MIPS16_CALL16: |
| 10971 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 10972 | case elfcpp::R_MIPS16_TLS_GD: |
| 10973 | case elfcpp::R_MIPS16_TLS_LDM: |
| 10974 | case elfcpp::R_MICROMIPS_GOT16: |
| 10975 | case elfcpp::R_MICROMIPS_CALL16: |
| 10976 | case elfcpp::R_MICROMIPS_CALL_HI16: |
| 10977 | case elfcpp::R_MICROMIPS_CALL_LO16: |
| 10978 | case elfcpp::R_MICROMIPS_GOT_HI16: |
| 10979 | case elfcpp::R_MICROMIPS_GOT_LO16: |
| 10980 | case elfcpp::R_MICROMIPS_GOT_PAGE: |
| 10981 | case elfcpp::R_MICROMIPS_GOT_OFST: |
| 10982 | case elfcpp::R_MICROMIPS_GOT_DISP: |
| 10983 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 10984 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 10985 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 10986 | case elfcpp::R_MIPS_EH: |
| 10987 | // We need a GOT section. |
| 10988 | target->got_section(symtab, layout); |
| 10989 | break; |
| 10990 | |
| 10991 | // This is just a hint; it can safely be ignored. Don't set |
| 10992 | // has_static_relocs for the corresponding symbol. |
| 10993 | case elfcpp::R_MIPS_JALR: |
| 10994 | case elfcpp::R_MICROMIPS_JALR: |
| 10995 | break; |
| 10996 | |
| 10997 | case elfcpp::R_MIPS_GPREL16: |
| 10998 | case elfcpp::R_MIPS_GPREL32: |
| 10999 | case elfcpp::R_MIPS16_GPREL: |
| 11000 | case elfcpp::R_MICROMIPS_GPREL16: |
| 11001 | // TODO(sasa) |
| 11002 | // GP-relative relocations always resolve to a definition in a |
| 11003 | // regular input file, ignoring the one-definition rule. This is |
| 11004 | // important for the GP setup sequence in NewABI code, which |
| 11005 | // always resolves to a local function even if other relocations |
| 11006 | // against the symbol wouldn't. |
| 11007 | //constrain_symbol_p = FALSE; |
| 11008 | break; |
| 11009 | |
| 11010 | case elfcpp::R_MIPS_32: |
| 11011 | case elfcpp::R_MIPS_REL32: |
| 11012 | case elfcpp::R_MIPS_64: |
| 11013 | if ((parameters->options().shared() |
| 11014 | || (strcmp(gsym->name(), "__gnu_local_gp") != 0 |
| 11015 | && (!is_readonly_section(output_section) |
| 11016 | || mips_obj->is_pic()))) |
| 11017 | && (output_section->flags() & elfcpp::SHF_ALLOC) != 0) |
| 11018 | { |
| 11019 | if (r_type != elfcpp::R_MIPS_REL32) |
| 11020 | mips_sym->set_pointer_equality_needed(); |
| 11021 | can_make_dynamic = true; |
| 11022 | break; |
| 11023 | } |
| 11024 | // Fall through. |
| 11025 | |
| 11026 | default: |
| 11027 | // Most static relocations require pointer equality, except |
| 11028 | // for branches. |
| 11029 | mips_sym->set_pointer_equality_needed(); |
| 11030 | // Fall through. |
| 11031 | |
| 11032 | case elfcpp::R_MIPS_26: |
| 11033 | case elfcpp::R_MIPS_PC16: |
| 11034 | case elfcpp::R_MIPS_PC21_S2: |
| 11035 | case elfcpp::R_MIPS_PC26_S2: |
| 11036 | case elfcpp::R_MIPS16_26: |
| 11037 | case elfcpp::R_MICROMIPS_26_S1: |
| 11038 | case elfcpp::R_MICROMIPS_PC7_S1: |
| 11039 | case elfcpp::R_MICROMIPS_PC10_S1: |
| 11040 | case elfcpp::R_MICROMIPS_PC16_S1: |
| 11041 | case elfcpp::R_MICROMIPS_PC23_S2: |
| 11042 | static_reloc = true; |
| 11043 | mips_sym->set_has_static_relocs(); |
| 11044 | break; |
| 11045 | } |
| 11046 | |
| 11047 | // If there are call relocations against an externally-defined symbol, |
| 11048 | // see whether we can create a MIPS lazy-binding stub for it. We can |
| 11049 | // only do this if all references to the function are through call |
| 11050 | // relocations, and in that case, the traditional lazy-binding stubs |
| 11051 | // are much more efficient than PLT entries. |
| 11052 | switch (r_type) |
| 11053 | { |
| 11054 | case elfcpp::R_MIPS16_CALL16: |
| 11055 | case elfcpp::R_MIPS_CALL16: |
| 11056 | case elfcpp::R_MIPS_CALL_HI16: |
| 11057 | case elfcpp::R_MIPS_CALL_LO16: |
| 11058 | case elfcpp::R_MIPS_JALR: |
| 11059 | case elfcpp::R_MICROMIPS_CALL16: |
| 11060 | case elfcpp::R_MICROMIPS_CALL_HI16: |
| 11061 | case elfcpp::R_MICROMIPS_CALL_LO16: |
| 11062 | case elfcpp::R_MICROMIPS_JALR: |
| 11063 | if (!mips_sym->no_lazy_stub()) |
| 11064 | { |
| 11065 | if ((mips_sym->needs_plt_entry() && mips_sym->is_from_dynobj()) |
| 11066 | // Calls from shared objects to undefined symbols of type |
| 11067 | // STT_NOTYPE need lazy-binding stub. |
| 11068 | || (mips_sym->is_undefined() && parameters->options().shared())) |
| 11069 | target->mips_stubs_section(layout)->make_entry(mips_sym); |
| 11070 | } |
| 11071 | break; |
| 11072 | default: |
| 11073 | { |
| 11074 | // We must not create a stub for a symbol that has relocations |
| 11075 | // related to taking the function's address. |
| 11076 | mips_sym->set_no_lazy_stub(); |
| 11077 | target->remove_lazy_stub_entry(mips_sym); |
| 11078 | break; |
| 11079 | } |
| 11080 | } |
| 11081 | |
| 11082 | if (relocation_needs_la25_stub<size, big_endian>(mips_obj, r_type, |
| 11083 | mips_sym->is_mips16())) |
| 11084 | mips_sym->set_has_nonpic_branches(); |
| 11085 | |
| 11086 | // R_MIPS_HI16 against _gp_disp is used for $gp setup, |
| 11087 | // and has a special meaning. |
| 11088 | bool gp_disp_against_hi16 = (!mips_obj->is_newabi() |
| 11089 | && strcmp(gsym->name(), "_gp_disp") == 0 |
| 11090 | && (hi16_reloc(r_type) || lo16_reloc(r_type))); |
| 11091 | if (static_reloc && gsym->needs_plt_entry()) |
| 11092 | { |
| 11093 | target->make_plt_entry(symtab, layout, mips_sym, r_type); |
| 11094 | |
| 11095 | // Since this is not a PC-relative relocation, we may be |
| 11096 | // taking the address of a function. In that case we need to |
| 11097 | // set the entry in the dynamic symbol table to the address of |
| 11098 | // the PLT entry. |
| 11099 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
| 11100 | { |
| 11101 | gsym->set_needs_dynsym_value(); |
| 11102 | // We distinguish between PLT entries and lazy-binding stubs by |
| 11103 | // giving the former an st_other value of STO_MIPS_PLT. Set the |
| 11104 | // flag if there are any relocations in the binary where pointer |
| 11105 | // equality matters. |
| 11106 | if (mips_sym->pointer_equality_needed()) |
| 11107 | mips_sym->set_mips_plt(); |
| 11108 | } |
| 11109 | } |
| 11110 | if ((static_reloc || can_make_dynamic) && !gp_disp_against_hi16) |
| 11111 | { |
| 11112 | // Absolute addressing relocations. |
| 11113 | // Make a dynamic relocation if necessary. |
| 11114 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
| 11115 | { |
| 11116 | if (gsym->may_need_copy_reloc()) |
| 11117 | { |
| 11118 | target->copy_reloc(symtab, layout, object, data_shndx, |
| 11119 | output_section, gsym, r_type, r_offset); |
| 11120 | } |
| 11121 | else if (can_make_dynamic) |
| 11122 | { |
| 11123 | // Create .rel.dyn section. |
| 11124 | target->rel_dyn_section(layout); |
| 11125 | target->dynamic_reloc(mips_sym, elfcpp::R_MIPS_REL32, mips_obj, |
| 11126 | data_shndx, output_section, r_offset); |
| 11127 | } |
| 11128 | else |
| 11129 | gold_error(_("non-dynamic relocations refer to dynamic symbol %s"), |
| 11130 | gsym->name()); |
| 11131 | } |
| 11132 | } |
| 11133 | |
| 11134 | bool for_call = false; |
| 11135 | switch (r_type) |
| 11136 | { |
| 11137 | case elfcpp::R_MIPS_CALL16: |
| 11138 | case elfcpp::R_MIPS16_CALL16: |
| 11139 | case elfcpp::R_MICROMIPS_CALL16: |
| 11140 | case elfcpp::R_MIPS_CALL_HI16: |
| 11141 | case elfcpp::R_MIPS_CALL_LO16: |
| 11142 | case elfcpp::R_MICROMIPS_CALL_HI16: |
| 11143 | case elfcpp::R_MICROMIPS_CALL_LO16: |
| 11144 | for_call = true; |
| 11145 | // Fall through. |
| 11146 | |
| 11147 | case elfcpp::R_MIPS16_GOT16: |
| 11148 | case elfcpp::R_MIPS_GOT16: |
| 11149 | case elfcpp::R_MIPS_GOT_HI16: |
| 11150 | case elfcpp::R_MIPS_GOT_LO16: |
| 11151 | case elfcpp::R_MICROMIPS_GOT16: |
| 11152 | case elfcpp::R_MICROMIPS_GOT_HI16: |
| 11153 | case elfcpp::R_MICROMIPS_GOT_LO16: |
| 11154 | case elfcpp::R_MIPS_GOT_DISP: |
| 11155 | case elfcpp::R_MICROMIPS_GOT_DISP: |
| 11156 | case elfcpp::R_MIPS_EH: |
| 11157 | { |
| 11158 | // The symbol requires a GOT entry. |
| 11159 | Mips_output_data_got<size, big_endian>* got = |
| 11160 | target->got_section(symtab, layout); |
| 11161 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, |
| 11162 | for_call); |
| 11163 | mips_sym->set_global_got_area(GGA_NORMAL); |
| 11164 | } |
| 11165 | break; |
| 11166 | |
| 11167 | case elfcpp::R_MIPS_GOT_PAGE: |
| 11168 | case elfcpp::R_MICROMIPS_GOT_PAGE: |
| 11169 | { |
| 11170 | // This relocation needs a page entry in the GOT. |
| 11171 | // Get the section contents. |
| 11172 | section_size_type view_size = 0; |
| 11173 | const unsigned char* view = |
| 11174 | object->section_contents(data_shndx, &view_size, false); |
| 11175 | view += r_offset; |
| 11176 | |
| 11177 | Valtype32 val = elfcpp::Swap<32, big_endian>::readval(view); |
| 11178 | Valtype32 addend = (rel_type == elfcpp::SHT_REL ? val & 0xffff |
| 11179 | : r_addend); |
| 11180 | Mips_output_data_got<size, big_endian>* got = |
| 11181 | target->got_section(symtab, layout); |
| 11182 | got->record_got_page_entry(mips_obj, r_sym, addend); |
| 11183 | |
| 11184 | // If this is a global, overridable symbol, GOT_PAGE will |
| 11185 | // decay to GOT_DISP, so we'll need a GOT entry for it. |
| 11186 | bool def_regular = (mips_sym->source() == Symbol::FROM_OBJECT |
| 11187 | && !mips_sym->object()->is_dynamic() |
| 11188 | && !mips_sym->is_undefined()); |
| 11189 | if (!def_regular |
| 11190 | || (parameters->options().output_is_position_independent() |
| 11191 | && !parameters->options().Bsymbolic() |
| 11192 | && !mips_sym->is_forced_local())) |
| 11193 | { |
| 11194 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, |
| 11195 | for_call); |
| 11196 | mips_sym->set_global_got_area(GGA_NORMAL); |
| 11197 | } |
| 11198 | } |
| 11199 | break; |
| 11200 | |
| 11201 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 11202 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 11203 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 11204 | case elfcpp::R_MIPS_TLS_LDM: |
| 11205 | case elfcpp::R_MIPS16_TLS_LDM: |
| 11206 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 11207 | case elfcpp::R_MIPS_TLS_GD: |
| 11208 | case elfcpp::R_MIPS16_TLS_GD: |
| 11209 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 11210 | { |
| 11211 | const bool is_final = gsym->final_value_is_known(); |
| 11212 | const tls::Tls_optimization optimized_type = |
| 11213 | Target_mips<size, big_endian>::optimize_tls_reloc(is_final, r_type); |
| 11214 | |
| 11215 | switch (r_type) |
| 11216 | { |
| 11217 | case elfcpp::R_MIPS_TLS_GD: |
| 11218 | case elfcpp::R_MIPS16_TLS_GD: |
| 11219 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 11220 | if (optimized_type == tls::TLSOPT_NONE) |
| 11221 | { |
| 11222 | // Create a pair of GOT entries for the module index and |
| 11223 | // dtv-relative offset. |
| 11224 | Mips_output_data_got<size, big_endian>* got = |
| 11225 | target->got_section(symtab, layout); |
| 11226 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, |
| 11227 | false); |
| 11228 | } |
| 11229 | else |
| 11230 | { |
| 11231 | // FIXME: TLS optimization not supported yet. |
| 11232 | gold_unreachable(); |
| 11233 | } |
| 11234 | break; |
| 11235 | |
| 11236 | case elfcpp::R_MIPS_TLS_LDM: |
| 11237 | case elfcpp::R_MIPS16_TLS_LDM: |
| 11238 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 11239 | if (optimized_type == tls::TLSOPT_NONE) |
| 11240 | { |
| 11241 | // We always record LDM symbols as local with index 0. |
| 11242 | target->got_section()->record_local_got_symbol(mips_obj, 0, |
| 11243 | r_addend, r_type, |
| 11244 | -1U, false); |
| 11245 | } |
| 11246 | else |
| 11247 | { |
| 11248 | // FIXME: TLS optimization not supported yet. |
| 11249 | gold_unreachable(); |
| 11250 | } |
| 11251 | break; |
| 11252 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 11253 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 11254 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 11255 | layout->set_has_static_tls(); |
| 11256 | if (optimized_type == tls::TLSOPT_NONE) |
| 11257 | { |
| 11258 | // Create a GOT entry for the tp-relative offset. |
| 11259 | Mips_output_data_got<size, big_endian>* got = |
| 11260 | target->got_section(symtab, layout); |
| 11261 | got->record_global_got_symbol(mips_sym, mips_obj, r_type, false, |
| 11262 | false); |
| 11263 | } |
| 11264 | else |
| 11265 | { |
| 11266 | // FIXME: TLS optimization not supported yet. |
| 11267 | gold_unreachable(); |
| 11268 | } |
| 11269 | break; |
| 11270 | |
| 11271 | default: |
| 11272 | gold_unreachable(); |
| 11273 | } |
| 11274 | } |
| 11275 | break; |
| 11276 | case elfcpp::R_MIPS_COPY: |
| 11277 | case elfcpp::R_MIPS_JUMP_SLOT: |
| 11278 | // These are relocations which should only be seen by the |
| 11279 | // dynamic linker, and should never be seen here. |
| 11280 | gold_error(_("%s: unexpected reloc %u in object file"), |
| 11281 | object->name().c_str(), r_type); |
| 11282 | break; |
| 11283 | |
| 11284 | default: |
| 11285 | break; |
| 11286 | } |
| 11287 | |
| 11288 | // Refuse some position-dependent relocations when creating a |
| 11289 | // shared library. Do not refuse R_MIPS_32 / R_MIPS_64; they're |
| 11290 | // not PIC, but we can create dynamic relocations and the result |
| 11291 | // will be fine. Also do not refuse R_MIPS_LO16, which can be |
| 11292 | // combined with R_MIPS_GOT16. |
| 11293 | if (parameters->options().shared()) |
| 11294 | { |
| 11295 | switch (r_type) |
| 11296 | { |
| 11297 | case elfcpp::R_MIPS16_HI16: |
| 11298 | case elfcpp::R_MIPS_HI16: |
| 11299 | case elfcpp::R_MIPS_HIGHER: |
| 11300 | case elfcpp::R_MIPS_HIGHEST: |
| 11301 | case elfcpp::R_MICROMIPS_HI16: |
| 11302 | case elfcpp::R_MICROMIPS_HIGHER: |
| 11303 | case elfcpp::R_MICROMIPS_HIGHEST: |
| 11304 | // Don't refuse a high part relocation if it's against |
| 11305 | // no symbol (e.g. part of a compound relocation). |
| 11306 | if (r_sym == 0) |
| 11307 | break; |
| 11308 | |
| 11309 | // R_MIPS_HI16 against _gp_disp is used for $gp setup, |
| 11310 | // and has a special meaning. |
| 11311 | if (!mips_obj->is_newabi() && strcmp(gsym->name(), "_gp_disp") == 0) |
| 11312 | break; |
| 11313 | // Fall through. |
| 11314 | |
| 11315 | case elfcpp::R_MIPS16_26: |
| 11316 | case elfcpp::R_MIPS_26: |
| 11317 | case elfcpp::R_MICROMIPS_26_S1: |
| 11318 | gold_error(_("%s: relocation %u against `%s' can not be used when " |
| 11319 | "making a shared object; recompile with -fPIC"), |
| 11320 | object->name().c_str(), r_type, gsym->name()); |
| 11321 | default: |
| 11322 | break; |
| 11323 | } |
| 11324 | } |
| 11325 | } |
| 11326 | |
| 11327 | template<int size, bool big_endian> |
| 11328 | inline void |
| 11329 | Target_mips<size, big_endian>::Scan::global( |
| 11330 | Symbol_table* symtab, |
| 11331 | Layout* layout, |
| 11332 | Target_mips<size, big_endian>* target, |
| 11333 | Sized_relobj_file<size, big_endian>* object, |
| 11334 | unsigned int data_shndx, |
| 11335 | Output_section* output_section, |
| 11336 | const Relatype& reloc, |
| 11337 | unsigned int r_type, |
| 11338 | Symbol* gsym) |
| 11339 | { |
| 11340 | global( |
| 11341 | symtab, |
| 11342 | layout, |
| 11343 | target, |
| 11344 | object, |
| 11345 | data_shndx, |
| 11346 | output_section, |
| 11347 | &reloc, |
| 11348 | (const Reltype*) NULL, |
| 11349 | elfcpp::SHT_RELA, |
| 11350 | r_type, |
| 11351 | gsym); |
| 11352 | } |
| 11353 | |
| 11354 | template<int size, bool big_endian> |
| 11355 | inline void |
| 11356 | Target_mips<size, big_endian>::Scan::global( |
| 11357 | Symbol_table* symtab, |
| 11358 | Layout* layout, |
| 11359 | Target_mips<size, big_endian>* target, |
| 11360 | Sized_relobj_file<size, big_endian>* object, |
| 11361 | unsigned int data_shndx, |
| 11362 | Output_section* output_section, |
| 11363 | const Reltype& reloc, |
| 11364 | unsigned int r_type, |
| 11365 | Symbol* gsym) |
| 11366 | { |
| 11367 | global( |
| 11368 | symtab, |
| 11369 | layout, |
| 11370 | target, |
| 11371 | object, |
| 11372 | data_shndx, |
| 11373 | output_section, |
| 11374 | (const Relatype*) NULL, |
| 11375 | &reloc, |
| 11376 | elfcpp::SHT_REL, |
| 11377 | r_type, |
| 11378 | gsym); |
| 11379 | } |
| 11380 | |
| 11381 | // Return whether a R_MIPS_32/R_MIPS64 relocation needs to be applied. |
| 11382 | // In cases where Scan::local() or Scan::global() has created |
| 11383 | // a dynamic relocation, the addend of the relocation is carried |
| 11384 | // in the data, and we must not apply the static relocation. |
| 11385 | |
| 11386 | template<int size, bool big_endian> |
| 11387 | inline bool |
| 11388 | Target_mips<size, big_endian>::Relocate::should_apply_static_reloc( |
| 11389 | const Mips_symbol<size>* gsym, |
| 11390 | unsigned int r_type, |
| 11391 | Output_section* output_section, |
| 11392 | Target_mips* target) |
| 11393 | { |
| 11394 | // If the output section is not allocated, then we didn't call |
| 11395 | // scan_relocs, we didn't create a dynamic reloc, and we must apply |
| 11396 | // the reloc here. |
| 11397 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) |
| 11398 | return true; |
| 11399 | |
| 11400 | if (gsym == NULL) |
| 11401 | return true; |
| 11402 | else |
| 11403 | { |
| 11404 | // For global symbols, we use the same helper routines used in the |
| 11405 | // scan pass. |
| 11406 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)) |
| 11407 | && !gsym->may_need_copy_reloc()) |
| 11408 | { |
| 11409 | // We have generated dynamic reloc (R_MIPS_REL32). |
| 11410 | |
| 11411 | bool multi_got = false; |
| 11412 | if (target->has_got_section()) |
| 11413 | multi_got = target->got_section()->multi_got(); |
| 11414 | bool has_got_offset; |
| 11415 | if (!multi_got) |
| 11416 | has_got_offset = gsym->has_got_offset(GOT_TYPE_STANDARD); |
| 11417 | else |
| 11418 | has_got_offset = gsym->global_gotoffset() != -1U; |
| 11419 | if (!has_got_offset) |
| 11420 | return true; |
| 11421 | else |
| 11422 | // Apply the relocation only if the symbol is in the local got. |
| 11423 | // Do not apply the relocation if the symbol is in the global |
| 11424 | // got. |
| 11425 | return symbol_references_local(gsym, gsym->has_dynsym_index()); |
| 11426 | } |
| 11427 | else |
| 11428 | // We have not generated dynamic reloc. |
| 11429 | return true; |
| 11430 | } |
| 11431 | } |
| 11432 | |
| 11433 | // Perform a relocation. |
| 11434 | |
| 11435 | template<int size, bool big_endian> |
| 11436 | inline bool |
| 11437 | Target_mips<size, big_endian>::Relocate::relocate( |
| 11438 | const Relocate_info<size, big_endian>* relinfo, |
| 11439 | unsigned int rel_type, |
| 11440 | Target_mips* target, |
| 11441 | Output_section* output_section, |
| 11442 | size_t relnum, |
| 11443 | const unsigned char* preloc, |
| 11444 | const Sized_symbol<size>* gsym, |
| 11445 | const Symbol_value<size>* psymval, |
| 11446 | unsigned char* view, |
| 11447 | Mips_address address, |
| 11448 | section_size_type) |
| 11449 | { |
| 11450 | Mips_address r_offset; |
| 11451 | unsigned int r_sym; |
| 11452 | unsigned int r_type; |
| 11453 | unsigned int r_type2; |
| 11454 | unsigned int r_type3; |
| 11455 | unsigned char r_ssym; |
| 11456 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend; |
| 11457 | // r_offset and r_type of the next relocation is needed for resolving multiple |
| 11458 | // consecutive relocations with the same offset. |
| 11459 | Mips_address next_r_offset = static_cast<Mips_address>(0) - 1; |
| 11460 | unsigned int next_r_type = elfcpp::R_MIPS_NONE; |
| 11461 | |
| 11462 | elfcpp::Shdr<size, big_endian> shdr(relinfo->reloc_shdr); |
| 11463 | size_t reloc_count = shdr.get_sh_size() / shdr.get_sh_entsize(); |
| 11464 | |
| 11465 | if (rel_type == elfcpp::SHT_RELA) |
| 11466 | { |
| 11467 | const Relatype rela(preloc); |
| 11468 | r_offset = rela.get_r_offset(); |
| 11469 | r_sym = Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 11470 | get_r_sym(&rela); |
| 11471 | r_type = Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 11472 | get_r_type(&rela); |
| 11473 | r_type2 = Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 11474 | get_r_type2(&rela); |
| 11475 | r_type3 = Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 11476 | get_r_type3(&rela); |
| 11477 | r_ssym = Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 11478 | get_r_ssym(&rela); |
| 11479 | r_addend = rela.get_r_addend(); |
| 11480 | // If this is not last relocation, get r_offset and r_type of the next |
| 11481 | // relocation. |
| 11482 | if (relnum + 1 < reloc_count) |
| 11483 | { |
| 11484 | const int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 11485 | const Relatype next_rela(preloc + reloc_size); |
| 11486 | next_r_offset = next_rela.get_r_offset(); |
| 11487 | next_r_type = |
| 11488 | Mips_classify_reloc<elfcpp::SHT_RELA, size, big_endian>:: |
| 11489 | get_r_type(&next_rela); |
| 11490 | } |
| 11491 | } |
| 11492 | else |
| 11493 | { |
| 11494 | const Reltype rel(preloc); |
| 11495 | r_offset = rel.get_r_offset(); |
| 11496 | r_sym = Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian>:: |
| 11497 | get_r_sym(&rel); |
| 11498 | r_type = Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian>:: |
| 11499 | get_r_type(&rel); |
| 11500 | r_ssym = 0; |
| 11501 | r_type2 = elfcpp::R_MIPS_NONE; |
| 11502 | r_type3 = elfcpp::R_MIPS_NONE; |
| 11503 | r_addend = 0; |
| 11504 | // If this is not last relocation, get r_offset and r_type of the next |
| 11505 | // relocation. |
| 11506 | if (relnum + 1 < reloc_count) |
| 11507 | { |
| 11508 | const int reloc_size = elfcpp::Elf_sizes<size>::rel_size; |
| 11509 | const Reltype next_rel(preloc + reloc_size); |
| 11510 | next_r_offset = next_rel.get_r_offset(); |
| 11511 | next_r_type = Mips_classify_reloc<elfcpp::SHT_REL, size, big_endian>:: |
| 11512 | get_r_type(&next_rel); |
| 11513 | } |
| 11514 | } |
| 11515 | |
| 11516 | typedef Mips_relocate_functions<size, big_endian> Reloc_funcs; |
| 11517 | typename Reloc_funcs::Status reloc_status = Reloc_funcs::STATUS_OKAY; |
| 11518 | |
| 11519 | Mips_relobj<size, big_endian>* object = |
| 11520 | Mips_relobj<size, big_endian>::as_mips_relobj(relinfo->object); |
| 11521 | |
| 11522 | bool target_is_16_bit_code = false; |
| 11523 | bool target_is_micromips_code = false; |
| 11524 | bool cross_mode_jump; |
| 11525 | |
| 11526 | Symbol_value<size> symval; |
| 11527 | |
| 11528 | const Mips_symbol<size>* mips_sym = Mips_symbol<size>::as_mips_sym(gsym); |
| 11529 | |
| 11530 | bool changed_symbol_value = false; |
| 11531 | if (gsym == NULL) |
| 11532 | { |
| 11533 | target_is_16_bit_code = object->local_symbol_is_mips16(r_sym); |
| 11534 | target_is_micromips_code = object->local_symbol_is_micromips(r_sym); |
| 11535 | if (target_is_16_bit_code || target_is_micromips_code) |
| 11536 | { |
| 11537 | // MIPS16/microMIPS text labels should be treated as odd. |
| 11538 | symval.set_output_value(psymval->value(object, 1)); |
| 11539 | psymval = &symval; |
| 11540 | changed_symbol_value = true; |
| 11541 | } |
| 11542 | } |
| 11543 | else |
| 11544 | { |
| 11545 | target_is_16_bit_code = mips_sym->is_mips16(); |
| 11546 | target_is_micromips_code = mips_sym->is_micromips(); |
| 11547 | |
| 11548 | // If this is a mips16/microMIPS text symbol, add 1 to the value to make |
| 11549 | // it odd. This will cause something like .word SYM to come up with |
| 11550 | // the right value when it is loaded into the PC. |
| 11551 | |
| 11552 | if ((mips_sym->is_mips16() || mips_sym->is_micromips()) |
| 11553 | && psymval->value(object, 0) != 0) |
| 11554 | { |
| 11555 | symval.set_output_value(psymval->value(object, 0) | 1); |
| 11556 | psymval = &symval; |
| 11557 | changed_symbol_value = true; |
| 11558 | } |
| 11559 | |
| 11560 | // Pick the value to use for symbols defined in shared objects. |
| 11561 | if (mips_sym->use_plt_offset(Scan::get_reference_flags(r_type)) |
| 11562 | || mips_sym->has_lazy_stub()) |
| 11563 | { |
| 11564 | Mips_address value; |
| 11565 | if (!mips_sym->has_lazy_stub()) |
| 11566 | { |
| 11567 | // Prefer a standard MIPS PLT entry. |
| 11568 | if (mips_sym->has_mips_plt_offset()) |
| 11569 | { |
| 11570 | value = target->plt_section()->mips_entry_address(mips_sym); |
| 11571 | target_is_micromips_code = false; |
| 11572 | target_is_16_bit_code = false; |
| 11573 | } |
| 11574 | else |
| 11575 | { |
| 11576 | value = (target->plt_section()->comp_entry_address(mips_sym) |
| 11577 | + 1); |
| 11578 | if (target->is_output_micromips()) |
| 11579 | target_is_micromips_code = true; |
| 11580 | else |
| 11581 | target_is_16_bit_code = true; |
| 11582 | } |
| 11583 | } |
| 11584 | else |
| 11585 | value = target->mips_stubs_section()->stub_address(mips_sym); |
| 11586 | |
| 11587 | symval.set_output_value(value); |
| 11588 | psymval = &symval; |
| 11589 | } |
| 11590 | } |
| 11591 | |
| 11592 | // TRUE if the symbol referred to by this relocation is "_gp_disp". |
| 11593 | // Note that such a symbol must always be a global symbol. |
| 11594 | bool gp_disp = (gsym != NULL && (strcmp(gsym->name(), "_gp_disp") == 0) |
| 11595 | && !object->is_newabi()); |
| 11596 | |
| 11597 | // TRUE if the symbol referred to by this relocation is "__gnu_local_gp". |
| 11598 | // Note that such a symbol must always be a global symbol. |
| 11599 | bool gnu_local_gp = gsym && (strcmp(gsym->name(), "__gnu_local_gp") == 0); |
| 11600 | |
| 11601 | |
| 11602 | if (gp_disp) |
| 11603 | { |
| 11604 | if (!hi16_reloc(r_type) && !lo16_reloc(r_type)) |
| 11605 | gold_error_at_location(relinfo, relnum, r_offset, |
| 11606 | _("relocations against _gp_disp are permitted only" |
| 11607 | " with R_MIPS_HI16 and R_MIPS_LO16 relocations.")); |
| 11608 | } |
| 11609 | else if (gnu_local_gp) |
| 11610 | { |
| 11611 | // __gnu_local_gp is _gp symbol. |
| 11612 | symval.set_output_value(target->adjusted_gp_value(object)); |
| 11613 | psymval = &symval; |
| 11614 | } |
| 11615 | |
| 11616 | // If this is a reference to a 16-bit function with a stub, we need |
| 11617 | // to redirect the relocation to the stub unless: |
| 11618 | // |
| 11619 | // (a) the relocation is for a MIPS16 JAL; |
| 11620 | // |
| 11621 | // (b) the relocation is for a MIPS16 PIC call, and there are no |
| 11622 | // non-MIPS16 uses of the GOT slot; or |
| 11623 | // |
| 11624 | // (c) the section allows direct references to MIPS16 functions. |
| 11625 | if (r_type != elfcpp::R_MIPS16_26 |
| 11626 | && ((mips_sym != NULL |
| 11627 | && mips_sym->has_mips16_fn_stub() |
| 11628 | && (r_type != elfcpp::R_MIPS16_CALL16 || mips_sym->need_fn_stub())) |
| 11629 | || (mips_sym == NULL |
| 11630 | && object->get_local_mips16_fn_stub(r_sym) != NULL)) |
| 11631 | && !object->section_allows_mips16_refs(relinfo->data_shndx)) |
| 11632 | { |
| 11633 | // This is a 32- or 64-bit call to a 16-bit function. We should |
| 11634 | // have already noticed that we were going to need the |
| 11635 | // stub. |
| 11636 | Mips_address value; |
| 11637 | if (mips_sym == NULL) |
| 11638 | value = object->get_local_mips16_fn_stub(r_sym)->output_address(); |
| 11639 | else |
| 11640 | { |
| 11641 | gold_assert(mips_sym->need_fn_stub()); |
| 11642 | if (mips_sym->has_la25_stub()) |
| 11643 | value = target->la25_stub_section()->stub_address(mips_sym); |
| 11644 | else |
| 11645 | { |
| 11646 | value = mips_sym->template |
| 11647 | get_mips16_fn_stub<big_endian>()->output_address(); |
| 11648 | } |
| 11649 | } |
| 11650 | symval.set_output_value(value); |
| 11651 | psymval = &symval; |
| 11652 | changed_symbol_value = true; |
| 11653 | |
| 11654 | // The target is 16-bit, but the stub isn't. |
| 11655 | target_is_16_bit_code = false; |
| 11656 | } |
| 11657 | // If this is a MIPS16 call with a stub, that is made through the PLT or |
| 11658 | // to a standard MIPS function, we need to redirect the call to the stub. |
| 11659 | // Note that we specifically exclude R_MIPS16_CALL16 from this behavior; |
| 11660 | // indirect calls should use an indirect stub instead. |
| 11661 | else if (r_type == elfcpp::R_MIPS16_26 |
| 11662 | && ((mips_sym != NULL |
| 11663 | && (mips_sym->has_mips16_call_stub() |
| 11664 | || mips_sym->has_mips16_call_fp_stub())) |
| 11665 | || (mips_sym == NULL |
| 11666 | && object->get_local_mips16_call_stub(r_sym) != NULL)) |
| 11667 | && ((mips_sym != NULL && mips_sym->has_plt_offset()) |
| 11668 | || !target_is_16_bit_code)) |
| 11669 | { |
| 11670 | Mips16_stub_section<size, big_endian>* call_stub; |
| 11671 | if (mips_sym == NULL) |
| 11672 | call_stub = object->get_local_mips16_call_stub(r_sym); |
| 11673 | else |
| 11674 | { |
| 11675 | // If both call_stub and call_fp_stub are defined, we can figure |
| 11676 | // out which one to use by checking which one appears in the input |
| 11677 | // file. |
| 11678 | if (mips_sym->has_mips16_call_stub() |
| 11679 | && mips_sym->has_mips16_call_fp_stub()) |
| 11680 | { |
| 11681 | call_stub = NULL; |
| 11682 | for (unsigned int i = 1; i < object->shnum(); ++i) |
| 11683 | { |
| 11684 | if (object->is_mips16_call_fp_stub_section(i)) |
| 11685 | { |
| 11686 | call_stub = mips_sym->template |
| 11687 | get_mips16_call_fp_stub<big_endian>(); |
| 11688 | break; |
| 11689 | } |
| 11690 | |
| 11691 | } |
| 11692 | if (call_stub == NULL) |
| 11693 | call_stub = |
| 11694 | mips_sym->template get_mips16_call_stub<big_endian>(); |
| 11695 | } |
| 11696 | else if (mips_sym->has_mips16_call_stub()) |
| 11697 | call_stub = mips_sym->template get_mips16_call_stub<big_endian>(); |
| 11698 | else |
| 11699 | call_stub = mips_sym->template get_mips16_call_fp_stub<big_endian>(); |
| 11700 | } |
| 11701 | |
| 11702 | symval.set_output_value(call_stub->output_address()); |
| 11703 | psymval = &symval; |
| 11704 | changed_symbol_value = true; |
| 11705 | } |
| 11706 | // If this is a direct call to a PIC function, redirect to the |
| 11707 | // non-PIC stub. |
| 11708 | else if (mips_sym != NULL |
| 11709 | && mips_sym->has_la25_stub() |
| 11710 | && relocation_needs_la25_stub<size, big_endian>( |
| 11711 | object, r_type, target_is_16_bit_code)) |
| 11712 | { |
| 11713 | Mips_address value = target->la25_stub_section()->stub_address(mips_sym); |
| 11714 | if (mips_sym->is_micromips()) |
| 11715 | value += 1; |
| 11716 | symval.set_output_value(value); |
| 11717 | psymval = &symval; |
| 11718 | } |
| 11719 | // For direct MIPS16 and microMIPS calls make sure the compressed PLT |
| 11720 | // entry is used if a standard PLT entry has also been made. |
| 11721 | else if ((r_type == elfcpp::R_MIPS16_26 |
| 11722 | || r_type == elfcpp::R_MICROMIPS_26_S1) |
| 11723 | && mips_sym != NULL |
| 11724 | && mips_sym->has_plt_offset() |
| 11725 | && mips_sym->has_comp_plt_offset() |
| 11726 | && mips_sym->has_mips_plt_offset()) |
| 11727 | { |
| 11728 | Mips_address value = (target->plt_section()->comp_entry_address(mips_sym) |
| 11729 | + 1); |
| 11730 | symval.set_output_value(value); |
| 11731 | psymval = &symval; |
| 11732 | |
| 11733 | target_is_16_bit_code = !target->is_output_micromips(); |
| 11734 | target_is_micromips_code = target->is_output_micromips(); |
| 11735 | } |
| 11736 | |
| 11737 | // Make sure MIPS16 and microMIPS are not used together. |
| 11738 | if ((r_type == elfcpp::R_MIPS16_26 && target_is_micromips_code) |
| 11739 | || (micromips_branch_reloc(r_type) && target_is_16_bit_code)) |
| 11740 | { |
| 11741 | gold_error(_("MIPS16 and microMIPS functions cannot call each other")); |
| 11742 | } |
| 11743 | |
| 11744 | // Calls from 16-bit code to 32-bit code and vice versa require the |
| 11745 | // mode change. However, we can ignore calls to undefined weak symbols, |
| 11746 | // which should never be executed at runtime. This exception is important |
| 11747 | // because the assembly writer may have "known" that any definition of the |
| 11748 | // symbol would be 16-bit code, and that direct jumps were therefore |
| 11749 | // acceptable. |
| 11750 | cross_mode_jump = |
| 11751 | (!(gsym != NULL && gsym->is_weak_undefined()) |
| 11752 | && ((r_type == elfcpp::R_MIPS16_26 && !target_is_16_bit_code) |
| 11753 | || (r_type == elfcpp::R_MICROMIPS_26_S1 && !target_is_micromips_code) |
| 11754 | || ((r_type == elfcpp::R_MIPS_26 || r_type == elfcpp::R_MIPS_JALR) |
| 11755 | && (target_is_16_bit_code || target_is_micromips_code)))); |
| 11756 | |
| 11757 | bool local = (mips_sym == NULL |
| 11758 | || (mips_sym->got_only_for_calls() |
| 11759 | ? symbol_calls_local(mips_sym, mips_sym->has_dynsym_index()) |
| 11760 | : symbol_references_local(mips_sym, |
| 11761 | mips_sym->has_dynsym_index()))); |
| 11762 | |
| 11763 | // Global R_MIPS_GOT_PAGE/R_MICROMIPS_GOT_PAGE relocations are equivalent |
| 11764 | // to R_MIPS_GOT_DISP/R_MICROMIPS_GOT_DISP. The addend is applied by the |
| 11765 | // corresponding R_MIPS_GOT_OFST/R_MICROMIPS_GOT_OFST. |
| 11766 | if (got_page_reloc(r_type) && !local) |
| 11767 | r_type = (micromips_reloc(r_type) ? elfcpp::R_MICROMIPS_GOT_DISP |
| 11768 | : elfcpp::R_MIPS_GOT_DISP); |
| 11769 | |
| 11770 | unsigned int got_offset = 0; |
| 11771 | int gp_offset = 0; |
| 11772 | |
| 11773 | // Whether we have to extract addend from instruction. |
| 11774 | bool extract_addend = rel_type == elfcpp::SHT_REL; |
| 11775 | unsigned int r_types[3] = { r_type, r_type2, r_type3 }; |
| 11776 | |
| 11777 | Reloc_funcs::mips_reloc_unshuffle(view, r_type, false); |
| 11778 | |
| 11779 | // For Mips64 N64 ABI, there may be up to three operations specified per |
| 11780 | // record, by the fields r_type, r_type2, and r_type3. The first operation |
| 11781 | // takes its addend from the relocation record. Each subsequent operation |
| 11782 | // takes as its addend the result of the previous operation. |
| 11783 | // The first operation in a record which references a symbol uses the symbol |
| 11784 | // implied by r_sym. The next operation in a record which references a symbol |
| 11785 | // uses the special symbol value given by the r_ssym field. A third operation |
| 11786 | // in a record which references a symbol will assume a NULL symbol, |
| 11787 | // i.e. value zero. |
| 11788 | |
| 11789 | // TODO(Vladimir) |
| 11790 | // Check if a record references to a symbol. |
| 11791 | for (unsigned int i = 0; i < 3; ++i) |
| 11792 | { |
| 11793 | if (r_types[i] == elfcpp::R_MIPS_NONE) |
| 11794 | break; |
| 11795 | |
| 11796 | // If we didn't apply previous relocation, use its result as addend |
| 11797 | // for current. |
| 11798 | if (this->calculate_only_) |
| 11799 | { |
| 11800 | r_addend = this->calculated_value_; |
| 11801 | extract_addend = false; |
| 11802 | } |
| 11803 | |
| 11804 | // In the N32 and 64-bit ABIs there may be multiple consecutive |
| 11805 | // relocations for the same offset. In that case we are |
| 11806 | // supposed to treat the output of each relocation as the addend |
| 11807 | // for the next. For N64 ABI, we are checking offsets only in a |
| 11808 | // third operation in a record (r_type3). |
| 11809 | this->calculate_only_ = |
| 11810 | (object->is_n64() && i < 2 |
| 11811 | ? r_types[i+1] != elfcpp::R_MIPS_NONE |
| 11812 | : (r_offset == next_r_offset) && (next_r_type != elfcpp::R_MIPS_NONE)); |
| 11813 | |
| 11814 | if (object->is_n64()) |
| 11815 | { |
| 11816 | if (i == 1) |
| 11817 | { |
| 11818 | // Handle special symbol for r_type2 relocation type. |
| 11819 | switch (r_ssym) |
| 11820 | { |
| 11821 | case RSS_UNDEF: |
| 11822 | symval.set_output_value(0); |
| 11823 | break; |
| 11824 | case RSS_GP: |
| 11825 | symval.set_output_value(target->gp_value()); |
| 11826 | break; |
| 11827 | case RSS_GP0: |
| 11828 | symval.set_output_value(object->gp_value()); |
| 11829 | break; |
| 11830 | case RSS_LOC: |
| 11831 | symval.set_output_value(address); |
| 11832 | break; |
| 11833 | default: |
| 11834 | gold_unreachable(); |
| 11835 | } |
| 11836 | psymval = &symval; |
| 11837 | } |
| 11838 | else if (i == 2) |
| 11839 | { |
| 11840 | // For r_type3 symbol value is 0. |
| 11841 | symval.set_output_value(0); |
| 11842 | } |
| 11843 | } |
| 11844 | |
| 11845 | bool update_got_entry = false; |
| 11846 | switch (r_types[i]) |
| 11847 | { |
| 11848 | case elfcpp::R_MIPS_NONE: |
| 11849 | break; |
| 11850 | case elfcpp::R_MIPS_16: |
| 11851 | reloc_status = Reloc_funcs::rel16(view, object, psymval, r_addend, |
| 11852 | extract_addend, |
| 11853 | this->calculate_only_, |
| 11854 | &this->calculated_value_); |
| 11855 | break; |
| 11856 | |
| 11857 | case elfcpp::R_MIPS_32: |
| 11858 | if (should_apply_static_reloc(mips_sym, r_types[i], output_section, |
| 11859 | target)) |
| 11860 | reloc_status = Reloc_funcs::rel32(view, object, psymval, r_addend, |
| 11861 | extract_addend, |
| 11862 | this->calculate_only_, |
| 11863 | &this->calculated_value_); |
| 11864 | if (mips_sym != NULL |
| 11865 | && (mips_sym->is_mips16() || mips_sym->is_micromips()) |
| 11866 | && mips_sym->global_got_area() == GGA_RELOC_ONLY) |
| 11867 | { |
| 11868 | // If mips_sym->has_mips16_fn_stub() is false, symbol value is |
| 11869 | // already updated by adding +1. |
| 11870 | if (mips_sym->has_mips16_fn_stub()) |
| 11871 | { |
| 11872 | gold_assert(mips_sym->need_fn_stub()); |
| 11873 | Mips16_stub_section<size, big_endian>* fn_stub = |
| 11874 | mips_sym->template get_mips16_fn_stub<big_endian>(); |
| 11875 | |
| 11876 | symval.set_output_value(fn_stub->output_address()); |
| 11877 | psymval = &symval; |
| 11878 | } |
| 11879 | got_offset = mips_sym->global_gotoffset(); |
| 11880 | update_got_entry = true; |
| 11881 | } |
| 11882 | break; |
| 11883 | |
| 11884 | case elfcpp::R_MIPS_64: |
| 11885 | if (should_apply_static_reloc(mips_sym, r_types[i], output_section, |
| 11886 | target)) |
| 11887 | reloc_status = Reloc_funcs::rel64(view, object, psymval, r_addend, |
| 11888 | extract_addend, |
| 11889 | this->calculate_only_, |
| 11890 | &this->calculated_value_, false); |
| 11891 | else if (target->is_output_n64() && r_addend != 0) |
| 11892 | // Only apply the addend. The static relocation was RELA, but the |
| 11893 | // dynamic relocation is REL, so we need to apply the addend. |
| 11894 | reloc_status = Reloc_funcs::rel64(view, object, psymval, r_addend, |
| 11895 | extract_addend, |
| 11896 | this->calculate_only_, |
| 11897 | &this->calculated_value_, true); |
| 11898 | break; |
| 11899 | case elfcpp::R_MIPS_REL32: |
| 11900 | gold_unreachable(); |
| 11901 | |
| 11902 | case elfcpp::R_MIPS_PC32: |
| 11903 | reloc_status = Reloc_funcs::relpc32(view, object, psymval, address, |
| 11904 | r_addend, extract_addend, |
| 11905 | this->calculate_only_, |
| 11906 | &this->calculated_value_); |
| 11907 | break; |
| 11908 | |
| 11909 | case elfcpp::R_MIPS16_26: |
| 11910 | // The calculation for R_MIPS16_26 is just the same as for an |
| 11911 | // R_MIPS_26. It's only the storage of the relocated field into |
| 11912 | // the output file that's different. So, we just fall through to the |
| 11913 | // R_MIPS_26 case here. |
| 11914 | case elfcpp::R_MIPS_26: |
| 11915 | case elfcpp::R_MICROMIPS_26_S1: |
| 11916 | reloc_status = Reloc_funcs::rel26(view, object, psymval, address, |
| 11917 | gsym == NULL, r_addend, extract_addend, gsym, cross_mode_jump, |
| 11918 | r_types[i], target->jal_to_bal(), this->calculate_only_, |
| 11919 | &this->calculated_value_); |
| 11920 | break; |
| 11921 | |
| 11922 | case elfcpp::R_MIPS_HI16: |
| 11923 | case elfcpp::R_MIPS16_HI16: |
| 11924 | case elfcpp::R_MICROMIPS_HI16: |
| 11925 | if (rel_type == elfcpp::SHT_RELA) |
| 11926 | reloc_status = Reloc_funcs::do_relhi16(view, object, psymval, |
| 11927 | r_addend, address, |
| 11928 | gp_disp, r_types[i], |
| 11929 | extract_addend, 0, |
| 11930 | target, |
| 11931 | this->calculate_only_, |
| 11932 | &this->calculated_value_); |
| 11933 | else if (rel_type == elfcpp::SHT_REL) |
| 11934 | reloc_status = Reloc_funcs::relhi16(view, object, psymval, r_addend, |
| 11935 | address, gp_disp, r_types[i], |
| 11936 | r_sym, extract_addend); |
| 11937 | else |
| 11938 | gold_unreachable(); |
| 11939 | break; |
| 11940 | |
| 11941 | case elfcpp::R_MIPS_LO16: |
| 11942 | case elfcpp::R_MIPS16_LO16: |
| 11943 | case elfcpp::R_MICROMIPS_LO16: |
| 11944 | case elfcpp::R_MICROMIPS_HI0_LO16: |
| 11945 | reloc_status = Reloc_funcs::rello16(target, view, object, psymval, |
| 11946 | r_addend, extract_addend, address, |
| 11947 | gp_disp, r_types[i], r_sym, |
| 11948 | rel_type, this->calculate_only_, |
| 11949 | &this->calculated_value_); |
| 11950 | break; |
| 11951 | |
| 11952 | case elfcpp::R_MIPS_LITERAL: |
| 11953 | case elfcpp::R_MICROMIPS_LITERAL: |
| 11954 | // Because we don't merge literal sections, we can handle this |
| 11955 | // just like R_MIPS_GPREL16. In the long run, we should merge |
| 11956 | // shared literals, and then we will need to additional work |
| 11957 | // here. |
| 11958 | |
| 11959 | // Fall through. |
| 11960 | |
| 11961 | case elfcpp::R_MIPS_GPREL16: |
| 11962 | case elfcpp::R_MIPS16_GPREL: |
| 11963 | case elfcpp::R_MICROMIPS_GPREL7_S2: |
| 11964 | case elfcpp::R_MICROMIPS_GPREL16: |
| 11965 | reloc_status = Reloc_funcs::relgprel(view, object, psymval, |
| 11966 | target->adjusted_gp_value(object), |
| 11967 | r_addend, extract_addend, |
| 11968 | gsym == NULL, r_types[i], |
| 11969 | this->calculate_only_, |
| 11970 | &this->calculated_value_); |
| 11971 | break; |
| 11972 | |
| 11973 | case elfcpp::R_MIPS_PC16: |
| 11974 | reloc_status = Reloc_funcs::relpc16(view, object, psymval, address, |
| 11975 | r_addend, extract_addend, |
| 11976 | this->calculate_only_, |
| 11977 | &this->calculated_value_); |
| 11978 | break; |
| 11979 | |
| 11980 | case elfcpp::R_MIPS_PC21_S2: |
| 11981 | reloc_status = Reloc_funcs::relpc21(view, object, psymval, address, |
| 11982 | r_addend, extract_addend, |
| 11983 | this->calculate_only_, |
| 11984 | &this->calculated_value_); |
| 11985 | break; |
| 11986 | |
| 11987 | case elfcpp::R_MIPS_PC26_S2: |
| 11988 | reloc_status = Reloc_funcs::relpc26(view, object, psymval, address, |
| 11989 | r_addend, extract_addend, |
| 11990 | this->calculate_only_, |
| 11991 | &this->calculated_value_); |
| 11992 | break; |
| 11993 | |
| 11994 | case elfcpp::R_MIPS_PC18_S3: |
| 11995 | reloc_status = Reloc_funcs::relpc18(view, object, psymval, address, |
| 11996 | r_addend, extract_addend, |
| 11997 | this->calculate_only_, |
| 11998 | &this->calculated_value_); |
| 11999 | break; |
| 12000 | |
| 12001 | case elfcpp::R_MIPS_PC19_S2: |
| 12002 | reloc_status = Reloc_funcs::relpc19(view, object, psymval, address, |
| 12003 | r_addend, extract_addend, |
| 12004 | this->calculate_only_, |
| 12005 | &this->calculated_value_); |
| 12006 | break; |
| 12007 | |
| 12008 | case elfcpp::R_MIPS_PCHI16: |
| 12009 | if (rel_type == elfcpp::SHT_RELA) |
| 12010 | reloc_status = Reloc_funcs::do_relpchi16(view, object, psymval, |
| 12011 | r_addend, address, |
| 12012 | extract_addend, 0, |
| 12013 | this->calculate_only_, |
| 12014 | &this->calculated_value_); |
| 12015 | else if (rel_type == elfcpp::SHT_REL) |
| 12016 | reloc_status = Reloc_funcs::relpchi16(view, object, psymval, |
| 12017 | r_addend, address, r_sym, |
| 12018 | extract_addend); |
| 12019 | else |
| 12020 | gold_unreachable(); |
| 12021 | break; |
| 12022 | |
| 12023 | case elfcpp::R_MIPS_PCLO16: |
| 12024 | reloc_status = Reloc_funcs::relpclo16(view, object, psymval, r_addend, |
| 12025 | extract_addend, address, r_sym, |
| 12026 | rel_type, this->calculate_only_, |
| 12027 | &this->calculated_value_); |
| 12028 | break; |
| 12029 | case elfcpp::R_MICROMIPS_PC7_S1: |
| 12030 | reloc_status = Reloc_funcs::relmicromips_pc7_s1(view, object, psymval, |
| 12031 | address, r_addend, |
| 12032 | extract_addend, |
| 12033 | this->calculate_only_, |
| 12034 | &this->calculated_value_); |
| 12035 | break; |
| 12036 | case elfcpp::R_MICROMIPS_PC10_S1: |
| 12037 | reloc_status = Reloc_funcs::relmicromips_pc10_s1(view, object, |
| 12038 | psymval, address, |
| 12039 | r_addend, extract_addend, |
| 12040 | this->calculate_only_, |
| 12041 | &this->calculated_value_); |
| 12042 | break; |
| 12043 | case elfcpp::R_MICROMIPS_PC16_S1: |
| 12044 | reloc_status = Reloc_funcs::relmicromips_pc16_s1(view, object, |
| 12045 | psymval, address, |
| 12046 | r_addend, extract_addend, |
| 12047 | this->calculate_only_, |
| 12048 | &this->calculated_value_); |
| 12049 | break; |
| 12050 | case elfcpp::R_MIPS_GPREL32: |
| 12051 | reloc_status = Reloc_funcs::relgprel32(view, object, psymval, |
| 12052 | target->adjusted_gp_value(object), |
| 12053 | r_addend, extract_addend, |
| 12054 | this->calculate_only_, |
| 12055 | &this->calculated_value_); |
| 12056 | break; |
| 12057 | case elfcpp::R_MIPS_GOT_HI16: |
| 12058 | case elfcpp::R_MIPS_CALL_HI16: |
| 12059 | case elfcpp::R_MICROMIPS_GOT_HI16: |
| 12060 | case elfcpp::R_MICROMIPS_CALL_HI16: |
| 12061 | if (gsym != NULL) |
| 12062 | got_offset = target->got_section()->got_offset(gsym, |
| 12063 | GOT_TYPE_STANDARD, |
| 12064 | object); |
| 12065 | else |
| 12066 | got_offset = target->got_section()->got_offset(r_sym, |
| 12067 | GOT_TYPE_STANDARD, |
| 12068 | object, r_addend); |
| 12069 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12070 | reloc_status = Reloc_funcs::relgot_hi16(view, gp_offset, |
| 12071 | this->calculate_only_, |
| 12072 | &this->calculated_value_); |
| 12073 | update_got_entry = changed_symbol_value; |
| 12074 | break; |
| 12075 | |
| 12076 | case elfcpp::R_MIPS_GOT_LO16: |
| 12077 | case elfcpp::R_MIPS_CALL_LO16: |
| 12078 | case elfcpp::R_MICROMIPS_GOT_LO16: |
| 12079 | case elfcpp::R_MICROMIPS_CALL_LO16: |
| 12080 | if (gsym != NULL) |
| 12081 | got_offset = target->got_section()->got_offset(gsym, |
| 12082 | GOT_TYPE_STANDARD, |
| 12083 | object); |
| 12084 | else |
| 12085 | got_offset = target->got_section()->got_offset(r_sym, |
| 12086 | GOT_TYPE_STANDARD, |
| 12087 | object, r_addend); |
| 12088 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12089 | reloc_status = Reloc_funcs::relgot_lo16(view, gp_offset, |
| 12090 | this->calculate_only_, |
| 12091 | &this->calculated_value_); |
| 12092 | update_got_entry = changed_symbol_value; |
| 12093 | break; |
| 12094 | |
| 12095 | case elfcpp::R_MIPS_GOT_DISP: |
| 12096 | case elfcpp::R_MICROMIPS_GOT_DISP: |
| 12097 | case elfcpp::R_MIPS_EH: |
| 12098 | if (gsym != NULL) |
| 12099 | got_offset = target->got_section()->got_offset(gsym, |
| 12100 | GOT_TYPE_STANDARD, |
| 12101 | object); |
| 12102 | else |
| 12103 | got_offset = target->got_section()->got_offset(r_sym, |
| 12104 | GOT_TYPE_STANDARD, |
| 12105 | object, r_addend); |
| 12106 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12107 | if (eh_reloc(r_types[i])) |
| 12108 | reloc_status = Reloc_funcs::releh(view, gp_offset, |
| 12109 | this->calculate_only_, |
| 12110 | &this->calculated_value_); |
| 12111 | else |
| 12112 | reloc_status = Reloc_funcs::relgot(view, gp_offset, |
| 12113 | this->calculate_only_, |
| 12114 | &this->calculated_value_); |
| 12115 | break; |
| 12116 | case elfcpp::R_MIPS_CALL16: |
| 12117 | case elfcpp::R_MIPS16_CALL16: |
| 12118 | case elfcpp::R_MICROMIPS_CALL16: |
| 12119 | gold_assert(gsym != NULL); |
| 12120 | got_offset = target->got_section()->got_offset(gsym, |
| 12121 | GOT_TYPE_STANDARD, |
| 12122 | object); |
| 12123 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12124 | reloc_status = Reloc_funcs::relgot(view, gp_offset, |
| 12125 | this->calculate_only_, |
| 12126 | &this->calculated_value_); |
| 12127 | // TODO(sasa): We should also initialize update_got_entry |
| 12128 | // in other place swhere relgot is called. |
| 12129 | update_got_entry = changed_symbol_value; |
| 12130 | break; |
| 12131 | |
| 12132 | case elfcpp::R_MIPS_GOT16: |
| 12133 | case elfcpp::R_MIPS16_GOT16: |
| 12134 | case elfcpp::R_MICROMIPS_GOT16: |
| 12135 | if (gsym != NULL) |
| 12136 | { |
| 12137 | got_offset = target->got_section()->got_offset(gsym, |
| 12138 | GOT_TYPE_STANDARD, |
| 12139 | object); |
| 12140 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12141 | reloc_status = Reloc_funcs::relgot(view, gp_offset, |
| 12142 | this->calculate_only_, |
| 12143 | &this->calculated_value_); |
| 12144 | } |
| 12145 | else |
| 12146 | { |
| 12147 | if (rel_type == elfcpp::SHT_RELA) |
| 12148 | reloc_status = Reloc_funcs::do_relgot16_local(view, object, |
| 12149 | psymval, r_addend, |
| 12150 | extract_addend, 0, |
| 12151 | target, |
| 12152 | this->calculate_only_, |
| 12153 | &this->calculated_value_); |
| 12154 | else if (rel_type == elfcpp::SHT_REL) |
| 12155 | reloc_status = Reloc_funcs::relgot16_local(view, object, |
| 12156 | psymval, r_addend, |
| 12157 | extract_addend, |
| 12158 | r_types[i], r_sym); |
| 12159 | else |
| 12160 | gold_unreachable(); |
| 12161 | } |
| 12162 | update_got_entry = changed_symbol_value; |
| 12163 | break; |
| 12164 | |
| 12165 | case elfcpp::R_MIPS_TLS_GD: |
| 12166 | case elfcpp::R_MIPS16_TLS_GD: |
| 12167 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 12168 | if (gsym != NULL) |
| 12169 | got_offset = target->got_section()->got_offset(gsym, |
| 12170 | GOT_TYPE_TLS_PAIR, |
| 12171 | object); |
| 12172 | else |
| 12173 | got_offset = target->got_section()->got_offset(r_sym, |
| 12174 | GOT_TYPE_TLS_PAIR, |
| 12175 | object, r_addend); |
| 12176 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12177 | reloc_status = Reloc_funcs::relgot(view, gp_offset, |
| 12178 | this->calculate_only_, |
| 12179 | &this->calculated_value_); |
| 12180 | break; |
| 12181 | |
| 12182 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 12183 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 12184 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 12185 | if (gsym != NULL) |
| 12186 | got_offset = target->got_section()->got_offset(gsym, |
| 12187 | GOT_TYPE_TLS_OFFSET, |
| 12188 | object); |
| 12189 | else |
| 12190 | got_offset = target->got_section()->got_offset(r_sym, |
| 12191 | GOT_TYPE_TLS_OFFSET, |
| 12192 | object, r_addend); |
| 12193 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12194 | reloc_status = Reloc_funcs::relgot(view, gp_offset, |
| 12195 | this->calculate_only_, |
| 12196 | &this->calculated_value_); |
| 12197 | break; |
| 12198 | |
| 12199 | case elfcpp::R_MIPS_TLS_LDM: |
| 12200 | case elfcpp::R_MIPS16_TLS_LDM: |
| 12201 | case elfcpp::R_MICROMIPS_TLS_LDM: |
| 12202 | // Relocate the field with the offset of the GOT entry for |
| 12203 | // the module index. |
| 12204 | got_offset = target->got_section()->tls_ldm_offset(object); |
| 12205 | gp_offset = target->got_section()->gp_offset(got_offset, object); |
| 12206 | reloc_status = Reloc_funcs::relgot(view, gp_offset, |
| 12207 | this->calculate_only_, |
| 12208 | &this->calculated_value_); |
| 12209 | break; |
| 12210 | |
| 12211 | case elfcpp::R_MIPS_GOT_PAGE: |
| 12212 | case elfcpp::R_MICROMIPS_GOT_PAGE: |
| 12213 | reloc_status = Reloc_funcs::relgotpage(target, view, object, psymval, |
| 12214 | r_addend, extract_addend, |
| 12215 | this->calculate_only_, |
| 12216 | &this->calculated_value_); |
| 12217 | break; |
| 12218 | |
| 12219 | case elfcpp::R_MIPS_GOT_OFST: |
| 12220 | case elfcpp::R_MICROMIPS_GOT_OFST: |
| 12221 | reloc_status = Reloc_funcs::relgotofst(target, view, object, psymval, |
| 12222 | r_addend, extract_addend, |
| 12223 | local, this->calculate_only_, |
| 12224 | &this->calculated_value_); |
| 12225 | break; |
| 12226 | |
| 12227 | case elfcpp::R_MIPS_JALR: |
| 12228 | case elfcpp::R_MICROMIPS_JALR: |
| 12229 | // This relocation is only a hint. In some cases, we optimize |
| 12230 | // it into a bal instruction. But we don't try to optimize |
| 12231 | // when the symbol does not resolve locally. |
| 12232 | if (gsym == NULL |
| 12233 | || symbol_calls_local(gsym, gsym->has_dynsym_index())) |
| 12234 | reloc_status = Reloc_funcs::reljalr(view, object, psymval, address, |
| 12235 | r_addend, extract_addend, |
| 12236 | cross_mode_jump, r_types[i], |
| 12237 | target->jalr_to_bal(), |
| 12238 | target->jr_to_b(), |
| 12239 | this->calculate_only_, |
| 12240 | &this->calculated_value_); |
| 12241 | break; |
| 12242 | |
| 12243 | case elfcpp::R_MIPS_TLS_DTPREL_HI16: |
| 12244 | case elfcpp::R_MIPS16_TLS_DTPREL_HI16: |
| 12245 | case elfcpp::R_MICROMIPS_TLS_DTPREL_HI16: |
| 12246 | reloc_status = Reloc_funcs::tlsrelhi16(view, object, psymval, |
| 12247 | elfcpp::DTP_OFFSET, r_addend, |
| 12248 | extract_addend, |
| 12249 | this->calculate_only_, |
| 12250 | &this->calculated_value_); |
| 12251 | break; |
| 12252 | case elfcpp::R_MIPS_TLS_DTPREL_LO16: |
| 12253 | case elfcpp::R_MIPS16_TLS_DTPREL_LO16: |
| 12254 | case elfcpp::R_MICROMIPS_TLS_DTPREL_LO16: |
| 12255 | reloc_status = Reloc_funcs::tlsrello16(view, object, psymval, |
| 12256 | elfcpp::DTP_OFFSET, r_addend, |
| 12257 | extract_addend, |
| 12258 | this->calculate_only_, |
| 12259 | &this->calculated_value_); |
| 12260 | break; |
| 12261 | case elfcpp::R_MIPS_TLS_DTPREL32: |
| 12262 | case elfcpp::R_MIPS_TLS_DTPREL64: |
| 12263 | reloc_status = Reloc_funcs::tlsrel32(view, object, psymval, |
| 12264 | elfcpp::DTP_OFFSET, r_addend, |
| 12265 | extract_addend, |
| 12266 | this->calculate_only_, |
| 12267 | &this->calculated_value_); |
| 12268 | break; |
| 12269 | case elfcpp::R_MIPS_TLS_TPREL_HI16: |
| 12270 | case elfcpp::R_MIPS16_TLS_TPREL_HI16: |
| 12271 | case elfcpp::R_MICROMIPS_TLS_TPREL_HI16: |
| 12272 | reloc_status = Reloc_funcs::tlsrelhi16(view, object, psymval, |
| 12273 | elfcpp::TP_OFFSET, r_addend, |
| 12274 | extract_addend, |
| 12275 | this->calculate_only_, |
| 12276 | &this->calculated_value_); |
| 12277 | break; |
| 12278 | case elfcpp::R_MIPS_TLS_TPREL_LO16: |
| 12279 | case elfcpp::R_MIPS16_TLS_TPREL_LO16: |
| 12280 | case elfcpp::R_MICROMIPS_TLS_TPREL_LO16: |
| 12281 | reloc_status = Reloc_funcs::tlsrello16(view, object, psymval, |
| 12282 | elfcpp::TP_OFFSET, r_addend, |
| 12283 | extract_addend, |
| 12284 | this->calculate_only_, |
| 12285 | &this->calculated_value_); |
| 12286 | break; |
| 12287 | case elfcpp::R_MIPS_TLS_TPREL32: |
| 12288 | case elfcpp::R_MIPS_TLS_TPREL64: |
| 12289 | reloc_status = Reloc_funcs::tlsrel32(view, object, psymval, |
| 12290 | elfcpp::TP_OFFSET, r_addend, |
| 12291 | extract_addend, |
| 12292 | this->calculate_only_, |
| 12293 | &this->calculated_value_); |
| 12294 | break; |
| 12295 | case elfcpp::R_MIPS_SUB: |
| 12296 | case elfcpp::R_MICROMIPS_SUB: |
| 12297 | reloc_status = Reloc_funcs::relsub(view, object, psymval, r_addend, |
| 12298 | extract_addend, |
| 12299 | this->calculate_only_, |
| 12300 | &this->calculated_value_); |
| 12301 | break; |
| 12302 | case elfcpp::R_MIPS_HIGHER: |
| 12303 | case elfcpp::R_MICROMIPS_HIGHER: |
| 12304 | reloc_status = Reloc_funcs::relhigher(view, object, psymval, r_addend, |
| 12305 | extract_addend, |
| 12306 | this->calculate_only_, |
| 12307 | &this->calculated_value_); |
| 12308 | break; |
| 12309 | case elfcpp::R_MIPS_HIGHEST: |
| 12310 | case elfcpp::R_MICROMIPS_HIGHEST: |
| 12311 | reloc_status = Reloc_funcs::relhighest(view, object, psymval, |
| 12312 | r_addend, extract_addend, |
| 12313 | this->calculate_only_, |
| 12314 | &this->calculated_value_); |
| 12315 | break; |
| 12316 | default: |
| 12317 | gold_error_at_location(relinfo, relnum, r_offset, |
| 12318 | _("unsupported reloc %u"), r_types[i]); |
| 12319 | break; |
| 12320 | } |
| 12321 | |
| 12322 | if (update_got_entry) |
| 12323 | { |
| 12324 | Mips_output_data_got<size, big_endian>* got = target->got_section(); |
| 12325 | if (mips_sym != NULL && mips_sym->get_applied_secondary_got_fixup()) |
| 12326 | got->update_got_entry(got->get_primary_got_offset(mips_sym), |
| 12327 | psymval->value(object, 0)); |
| 12328 | else |
| 12329 | got->update_got_entry(got_offset, psymval->value(object, 0)); |
| 12330 | } |
| 12331 | } |
| 12332 | |
| 12333 | bool jal_shuffle = jal_reloc(r_type); |
| 12334 | Reloc_funcs::mips_reloc_shuffle(view, r_type, jal_shuffle); |
| 12335 | |
| 12336 | // Report any errors. |
| 12337 | switch (reloc_status) |
| 12338 | { |
| 12339 | case Reloc_funcs::STATUS_OKAY: |
| 12340 | break; |
| 12341 | case Reloc_funcs::STATUS_OVERFLOW: |
| 12342 | if (gsym == NULL) |
| 12343 | gold_error_at_location(relinfo, relnum, r_offset, |
| 12344 | _("relocation overflow: " |
| 12345 | "%u against local symbol %u in %s"), |
| 12346 | r_type, r_sym, object->name().c_str()); |
| 12347 | else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT) |
| 12348 | gold_error_at_location(relinfo, relnum, r_offset, |
| 12349 | _("relocation overflow: " |
| 12350 | "%u against '%s' defined in %s"), |
| 12351 | r_type, gsym->demangled_name().c_str(), |
| 12352 | gsym->object()->name().c_str()); |
| 12353 | else |
| 12354 | gold_error_at_location(relinfo, relnum, r_offset, |
| 12355 | _("relocation overflow: %u against '%s'"), |
| 12356 | r_type, gsym->demangled_name().c_str()); |
| 12357 | break; |
| 12358 | case Reloc_funcs::STATUS_BAD_RELOC: |
| 12359 | gold_error_at_location(relinfo, relnum, r_offset, |
| 12360 | _("unexpected opcode while processing relocation")); |
| 12361 | break; |
| 12362 | case Reloc_funcs::STATUS_PCREL_UNALIGNED: |
| 12363 | gold_error_at_location(relinfo, relnum, r_offset, |
| 12364 | _("unaligned PC-relative relocation")); |
| 12365 | break; |
| 12366 | default: |
| 12367 | gold_unreachable(); |
| 12368 | } |
| 12369 | |
| 12370 | return true; |
| 12371 | } |
| 12372 | |
| 12373 | // Get the Reference_flags for a particular relocation. |
| 12374 | |
| 12375 | template<int size, bool big_endian> |
| 12376 | int |
| 12377 | Target_mips<size, big_endian>::Scan::get_reference_flags( |
| 12378 | unsigned int r_type) |
| 12379 | { |
| 12380 | switch (r_type) |
| 12381 | { |
| 12382 | case elfcpp::R_MIPS_NONE: |
| 12383 | // No symbol reference. |
| 12384 | return 0; |
| 12385 | |
| 12386 | case elfcpp::R_MIPS_16: |
| 12387 | case elfcpp::R_MIPS_32: |
| 12388 | case elfcpp::R_MIPS_64: |
| 12389 | case elfcpp::R_MIPS_HI16: |
| 12390 | case elfcpp::R_MIPS_LO16: |
| 12391 | case elfcpp::R_MIPS_HIGHER: |
| 12392 | case elfcpp::R_MIPS_HIGHEST: |
| 12393 | case elfcpp::R_MIPS16_HI16: |
| 12394 | case elfcpp::R_MIPS16_LO16: |
| 12395 | case elfcpp::R_MICROMIPS_HI16: |
| 12396 | case elfcpp::R_MICROMIPS_LO16: |
| 12397 | case elfcpp::R_MICROMIPS_HIGHER: |
| 12398 | case elfcpp::R_MICROMIPS_HIGHEST: |
| 12399 | return Symbol::ABSOLUTE_REF; |
| 12400 | |
| 12401 | case elfcpp::R_MIPS_26: |
| 12402 | case elfcpp::R_MIPS16_26: |
| 12403 | case elfcpp::R_MICROMIPS_26_S1: |
| 12404 | return Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; |
| 12405 | |
| 12406 | case elfcpp::R_MIPS_PC18_S3: |
| 12407 | case elfcpp::R_MIPS_PC19_S2: |
| 12408 | case elfcpp::R_MIPS_PCHI16: |
| 12409 | case elfcpp::R_MIPS_PCLO16: |
| 12410 | case elfcpp::R_MIPS_GPREL32: |
| 12411 | case elfcpp::R_MIPS_GPREL16: |
| 12412 | case elfcpp::R_MIPS_REL32: |
| 12413 | case elfcpp::R_MIPS16_GPREL: |
| 12414 | return Symbol::RELATIVE_REF; |
| 12415 | |
| 12416 | case elfcpp::R_MIPS_PC16: |
| 12417 | case elfcpp::R_MIPS_PC32: |
| 12418 | case elfcpp::R_MIPS_PC21_S2: |
| 12419 | case elfcpp::R_MIPS_PC26_S2: |
| 12420 | case elfcpp::R_MIPS_JALR: |
| 12421 | case elfcpp::R_MICROMIPS_JALR: |
| 12422 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; |
| 12423 | |
| 12424 | case elfcpp::R_MIPS_GOT16: |
| 12425 | case elfcpp::R_MIPS_CALL16: |
| 12426 | case elfcpp::R_MIPS_GOT_DISP: |
| 12427 | case elfcpp::R_MIPS_GOT_HI16: |
| 12428 | case elfcpp::R_MIPS_GOT_LO16: |
| 12429 | case elfcpp::R_MIPS_CALL_HI16: |
| 12430 | case elfcpp::R_MIPS_CALL_LO16: |
| 12431 | case elfcpp::R_MIPS_LITERAL: |
| 12432 | case elfcpp::R_MIPS_GOT_PAGE: |
| 12433 | case elfcpp::R_MIPS_GOT_OFST: |
| 12434 | case elfcpp::R_MIPS16_GOT16: |
| 12435 | case elfcpp::R_MIPS16_CALL16: |
| 12436 | case elfcpp::R_MICROMIPS_GOT16: |
| 12437 | case elfcpp::R_MICROMIPS_CALL16: |
| 12438 | case elfcpp::R_MICROMIPS_GOT_HI16: |
| 12439 | case elfcpp::R_MICROMIPS_GOT_LO16: |
| 12440 | case elfcpp::R_MICROMIPS_CALL_HI16: |
| 12441 | case elfcpp::R_MICROMIPS_CALL_LO16: |
| 12442 | case elfcpp::R_MIPS_EH: |
| 12443 | // Absolute in GOT. |
| 12444 | return Symbol::RELATIVE_REF; |
| 12445 | |
| 12446 | case elfcpp::R_MIPS_TLS_DTPMOD32: |
| 12447 | case elfcpp::R_MIPS_TLS_DTPREL32: |
| 12448 | case elfcpp::R_MIPS_TLS_DTPMOD64: |
| 12449 | case elfcpp::R_MIPS_TLS_DTPREL64: |
| 12450 | case elfcpp::R_MIPS_TLS_GD: |
| 12451 | case elfcpp::R_MIPS_TLS_LDM: |
| 12452 | case elfcpp::R_MIPS_TLS_DTPREL_HI16: |
| 12453 | case elfcpp::R_MIPS_TLS_DTPREL_LO16: |
| 12454 | case elfcpp::R_MIPS_TLS_GOTTPREL: |
| 12455 | case elfcpp::R_MIPS_TLS_TPREL32: |
| 12456 | case elfcpp::R_MIPS_TLS_TPREL64: |
| 12457 | case elfcpp::R_MIPS_TLS_TPREL_HI16: |
| 12458 | case elfcpp::R_MIPS_TLS_TPREL_LO16: |
| 12459 | case elfcpp::R_MIPS16_TLS_GD: |
| 12460 | case elfcpp::R_MIPS16_TLS_GOTTPREL: |
| 12461 | case elfcpp::R_MICROMIPS_TLS_GD: |
| 12462 | case elfcpp::R_MICROMIPS_TLS_GOTTPREL: |
| 12463 | case elfcpp::R_MICROMIPS_TLS_TPREL_HI16: |
| 12464 | case elfcpp::R_MICROMIPS_TLS_TPREL_LO16: |
| 12465 | return Symbol::TLS_REF; |
| 12466 | |
| 12467 | case elfcpp::R_MIPS_COPY: |
| 12468 | case elfcpp::R_MIPS_JUMP_SLOT: |
| 12469 | default: |
| 12470 | // Not expected. We will give an error later. |
| 12471 | return 0; |
| 12472 | } |
| 12473 | } |
| 12474 | |
| 12475 | // Report an unsupported relocation against a local symbol. |
| 12476 | |
| 12477 | template<int size, bool big_endian> |
| 12478 | void |
| 12479 | Target_mips<size, big_endian>::Scan::unsupported_reloc_local( |
| 12480 | Sized_relobj_file<size, big_endian>* object, |
| 12481 | unsigned int r_type) |
| 12482 | { |
| 12483 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 12484 | object->name().c_str(), r_type); |
| 12485 | } |
| 12486 | |
| 12487 | // Report an unsupported relocation against a global symbol. |
| 12488 | |
| 12489 | template<int size, bool big_endian> |
| 12490 | void |
| 12491 | Target_mips<size, big_endian>::Scan::unsupported_reloc_global( |
| 12492 | Sized_relobj_file<size, big_endian>* object, |
| 12493 | unsigned int r_type, |
| 12494 | Symbol* gsym) |
| 12495 | { |
| 12496 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 12497 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| 12498 | } |
| 12499 | |
| 12500 | // Return printable name for ABI. |
| 12501 | template<int size, bool big_endian> |
| 12502 | const char* |
| 12503 | Target_mips<size, big_endian>::elf_mips_abi_name(elfcpp::Elf_Word e_flags) |
| 12504 | { |
| 12505 | switch (e_flags & elfcpp::EF_MIPS_ABI) |
| 12506 | { |
| 12507 | case 0: |
| 12508 | if ((e_flags & elfcpp::EF_MIPS_ABI2) != 0) |
| 12509 | return "N32"; |
| 12510 | else if (size == 64) |
| 12511 | return "64"; |
| 12512 | else |
| 12513 | return "none"; |
| 12514 | case elfcpp::E_MIPS_ABI_O32: |
| 12515 | return "O32"; |
| 12516 | case elfcpp::E_MIPS_ABI_O64: |
| 12517 | return "O64"; |
| 12518 | case elfcpp::E_MIPS_ABI_EABI32: |
| 12519 | return "EABI32"; |
| 12520 | case elfcpp::E_MIPS_ABI_EABI64: |
| 12521 | return "EABI64"; |
| 12522 | default: |
| 12523 | return "unknown abi"; |
| 12524 | } |
| 12525 | } |
| 12526 | |
| 12527 | template<int size, bool big_endian> |
| 12528 | const char* |
| 12529 | Target_mips<size, big_endian>::elf_mips_mach_name(elfcpp::Elf_Word e_flags) |
| 12530 | { |
| 12531 | switch (e_flags & elfcpp::EF_MIPS_MACH) |
| 12532 | { |
| 12533 | case elfcpp::E_MIPS_MACH_3900: |
| 12534 | return "mips:3900"; |
| 12535 | case elfcpp::E_MIPS_MACH_4010: |
| 12536 | return "mips:4010"; |
| 12537 | case elfcpp::E_MIPS_MACH_4100: |
| 12538 | return "mips:4100"; |
| 12539 | case elfcpp::E_MIPS_MACH_4111: |
| 12540 | return "mips:4111"; |
| 12541 | case elfcpp::E_MIPS_MACH_4120: |
| 12542 | return "mips:4120"; |
| 12543 | case elfcpp::E_MIPS_MACH_4650: |
| 12544 | return "mips:4650"; |
| 12545 | case elfcpp::E_MIPS_MACH_5400: |
| 12546 | return "mips:5400"; |
| 12547 | case elfcpp::E_MIPS_MACH_5500: |
| 12548 | return "mips:5500"; |
| 12549 | case elfcpp::E_MIPS_MACH_5900: |
| 12550 | return "mips:5900"; |
| 12551 | case elfcpp::E_MIPS_MACH_SB1: |
| 12552 | return "mips:sb1"; |
| 12553 | case elfcpp::E_MIPS_MACH_9000: |
| 12554 | return "mips:9000"; |
| 12555 | case elfcpp::E_MIPS_MACH_LS2E: |
| 12556 | return "mips:loongson_2e"; |
| 12557 | case elfcpp::E_MIPS_MACH_LS2F: |
| 12558 | return "mips:loongson_2f"; |
| 12559 | case elfcpp::E_MIPS_MACH_LS3A: |
| 12560 | return "mips:loongson_3a"; |
| 12561 | case elfcpp::E_MIPS_MACH_OCTEON: |
| 12562 | return "mips:octeon"; |
| 12563 | case elfcpp::E_MIPS_MACH_OCTEON2: |
| 12564 | return "mips:octeon2"; |
| 12565 | case elfcpp::E_MIPS_MACH_OCTEON3: |
| 12566 | return "mips:octeon3"; |
| 12567 | case elfcpp::E_MIPS_MACH_XLR: |
| 12568 | return "mips:xlr"; |
| 12569 | default: |
| 12570 | switch (e_flags & elfcpp::EF_MIPS_ARCH) |
| 12571 | { |
| 12572 | default: |
| 12573 | case elfcpp::E_MIPS_ARCH_1: |
| 12574 | return "mips:3000"; |
| 12575 | |
| 12576 | case elfcpp::E_MIPS_ARCH_2: |
| 12577 | return "mips:6000"; |
| 12578 | |
| 12579 | case elfcpp::E_MIPS_ARCH_3: |
| 12580 | return "mips:4000"; |
| 12581 | |
| 12582 | case elfcpp::E_MIPS_ARCH_4: |
| 12583 | return "mips:8000"; |
| 12584 | |
| 12585 | case elfcpp::E_MIPS_ARCH_5: |
| 12586 | return "mips:mips5"; |
| 12587 | |
| 12588 | case elfcpp::E_MIPS_ARCH_32: |
| 12589 | return "mips:isa32"; |
| 12590 | |
| 12591 | case elfcpp::E_MIPS_ARCH_64: |
| 12592 | return "mips:isa64"; |
| 12593 | |
| 12594 | case elfcpp::E_MIPS_ARCH_32R2: |
| 12595 | return "mips:isa32r2"; |
| 12596 | |
| 12597 | case elfcpp::E_MIPS_ARCH_32R6: |
| 12598 | return "mips:isa32r6"; |
| 12599 | |
| 12600 | case elfcpp::E_MIPS_ARCH_64R2: |
| 12601 | return "mips:isa64r2"; |
| 12602 | |
| 12603 | case elfcpp::E_MIPS_ARCH_64R6: |
| 12604 | return "mips:isa64r6"; |
| 12605 | } |
| 12606 | } |
| 12607 | return "unknown CPU"; |
| 12608 | } |
| 12609 | |
| 12610 | template<int size, bool big_endian> |
| 12611 | const Target::Target_info Target_mips<size, big_endian>::mips_info = |
| 12612 | { |
| 12613 | size, // size |
| 12614 | big_endian, // is_big_endian |
| 12615 | elfcpp::EM_MIPS, // machine_code |
| 12616 | true, // has_make_symbol |
| 12617 | false, // has_resolve |
| 12618 | false, // has_code_fill |
| 12619 | true, // is_default_stack_executable |
| 12620 | false, // can_icf_inline_merge_sections |
| 12621 | '\0', // wrap_char |
| 12622 | size == 32 ? "/lib/ld.so.1" : "/lib64/ld.so.1", // dynamic_linker |
| 12623 | 0x400000, // default_text_segment_address |
| 12624 | 64 * 1024, // abi_pagesize (overridable by -z max-page-size) |
| 12625 | 4 * 1024, // common_pagesize (overridable by -z common-page-size) |
| 12626 | false, // isolate_execinstr |
| 12627 | 0, // rosegment_gap |
| 12628 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 12629 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 12630 | 0, // small_common_section_flags |
| 12631 | 0, // large_common_section_flags |
| 12632 | NULL, // attributes_section |
| 12633 | NULL, // attributes_vendor |
| 12634 | "__start", // entry_symbol_name |
| 12635 | 32, // hash_entry_size |
| 12636 | }; |
| 12637 | |
| 12638 | template<int size, bool big_endian> |
| 12639 | class Target_mips_nacl : public Target_mips<size, big_endian> |
| 12640 | { |
| 12641 | public: |
| 12642 | Target_mips_nacl() |
| 12643 | : Target_mips<size, big_endian>(&mips_nacl_info) |
| 12644 | { } |
| 12645 | |
| 12646 | private: |
| 12647 | static const Target::Target_info mips_nacl_info; |
| 12648 | }; |
| 12649 | |
| 12650 | template<int size, bool big_endian> |
| 12651 | const Target::Target_info Target_mips_nacl<size, big_endian>::mips_nacl_info = |
| 12652 | { |
| 12653 | size, // size |
| 12654 | big_endian, // is_big_endian |
| 12655 | elfcpp::EM_MIPS, // machine_code |
| 12656 | true, // has_make_symbol |
| 12657 | false, // has_resolve |
| 12658 | false, // has_code_fill |
| 12659 | true, // is_default_stack_executable |
| 12660 | false, // can_icf_inline_merge_sections |
| 12661 | '\0', // wrap_char |
| 12662 | "/lib/ld.so.1", // dynamic_linker |
| 12663 | 0x20000, // default_text_segment_address |
| 12664 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
| 12665 | 0x10000, // common_pagesize (overridable by -z common-page-size) |
| 12666 | true, // isolate_execinstr |
| 12667 | 0x10000000, // rosegment_gap |
| 12668 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 12669 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 12670 | 0, // small_common_section_flags |
| 12671 | 0, // large_common_section_flags |
| 12672 | NULL, // attributes_section |
| 12673 | NULL, // attributes_vendor |
| 12674 | "_start", // entry_symbol_name |
| 12675 | 32, // hash_entry_size |
| 12676 | }; |
| 12677 | |
| 12678 | // Target selector for Mips. Note this is never instantiated directly. |
| 12679 | // It's only used in Target_selector_mips_nacl, below. |
| 12680 | |
| 12681 | template<int size, bool big_endian> |
| 12682 | class Target_selector_mips : public Target_selector |
| 12683 | { |
| 12684 | public: |
| 12685 | Target_selector_mips() |
| 12686 | : Target_selector(elfcpp::EM_MIPS, size, big_endian, |
| 12687 | (size == 64 ? |
| 12688 | (big_endian ? "elf64-tradbigmips" : "elf64-tradlittlemips") : |
| 12689 | (big_endian ? "elf32-tradbigmips" : "elf32-tradlittlemips")), |
| 12690 | (size == 64 ? |
| 12691 | (big_endian ? "elf64btsmip" : "elf64ltsmip") : |
| 12692 | (big_endian ? "elf32btsmip" : "elf32ltsmip"))) |
| 12693 | { } |
| 12694 | |
| 12695 | Target* do_instantiate_target() |
| 12696 | { return new Target_mips<size, big_endian>(); } |
| 12697 | }; |
| 12698 | |
| 12699 | template<int size, bool big_endian> |
| 12700 | class Target_selector_mips_nacl |
| 12701 | : public Target_selector_nacl<Target_selector_mips<size, big_endian>, |
| 12702 | Target_mips_nacl<size, big_endian> > |
| 12703 | { |
| 12704 | public: |
| 12705 | Target_selector_mips_nacl() |
| 12706 | : Target_selector_nacl<Target_selector_mips<size, big_endian>, |
| 12707 | Target_mips_nacl<size, big_endian> >( |
| 12708 | // NaCl currently supports only MIPS32 little-endian. |
| 12709 | "mipsel", "elf32-tradlittlemips-nacl", "elf32-tradlittlemips-nacl") |
| 12710 | { } |
| 12711 | }; |
| 12712 | |
| 12713 | Target_selector_mips_nacl<32, true> target_selector_mips32; |
| 12714 | Target_selector_mips_nacl<32, false> target_selector_mips32el; |
| 12715 | Target_selector_mips_nacl<64, true> target_selector_mips64; |
| 12716 | Target_selector_mips_nacl<64, false> target_selector_mips64el; |
| 12717 | |
| 12718 | } // End anonymous namespace. |