| 1 | // aarch64.cc -- aarch64 target support for gold. |
| 2 | |
| 3 | // Copyright (C) 2014-2015 Free Software Foundation, Inc. |
| 4 | // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cstring> |
| 26 | #include <map> |
| 27 | #include <set> |
| 28 | |
| 29 | #include "elfcpp.h" |
| 30 | #include "dwarf.h" |
| 31 | #include "parameters.h" |
| 32 | #include "reloc.h" |
| 33 | #include "aarch64.h" |
| 34 | #include "object.h" |
| 35 | #include "symtab.h" |
| 36 | #include "layout.h" |
| 37 | #include "output.h" |
| 38 | #include "copy-relocs.h" |
| 39 | #include "target.h" |
| 40 | #include "target-reloc.h" |
| 41 | #include "target-select.h" |
| 42 | #include "tls.h" |
| 43 | #include "freebsd.h" |
| 44 | #include "nacl.h" |
| 45 | #include "gc.h" |
| 46 | #include "icf.h" |
| 47 | #include "aarch64-reloc-property.h" |
| 48 | |
| 49 | // The first three .got.plt entries are reserved. |
| 50 | const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3; |
| 51 | |
| 52 | |
| 53 | namespace |
| 54 | { |
| 55 | |
| 56 | using namespace gold; |
| 57 | |
| 58 | template<int size, bool big_endian> |
| 59 | class Output_data_plt_aarch64; |
| 60 | |
| 61 | template<int size, bool big_endian> |
| 62 | class Output_data_plt_aarch64_standard; |
| 63 | |
| 64 | template<int size, bool big_endian> |
| 65 | class Target_aarch64; |
| 66 | |
| 67 | template<int size, bool big_endian> |
| 68 | class AArch64_relocate_functions; |
| 69 | |
| 70 | // Utility class dealing with insns. This is ported from macros in |
| 71 | // bfd/elfnn-aarch64.cc, but wrapped inside a class as static members. This |
| 72 | // class is used in erratum sequence scanning. |
| 73 | |
| 74 | template<bool big_endian> |
| 75 | class AArch64_insn_utilities |
| 76 | { |
| 77 | public: |
| 78 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 79 | |
| 80 | static const int BYTES_PER_INSN; |
| 81 | |
| 82 | // Zero register encoding - 31. |
| 83 | static const unsigned int AARCH64_ZR; |
| 84 | |
| 85 | static unsigned int |
| 86 | aarch64_bit(Insntype insn, int pos) |
| 87 | { return ((1 << pos) & insn) >> pos; } |
| 88 | |
| 89 | static unsigned int |
| 90 | aarch64_bits(Insntype insn, int pos, int l) |
| 91 | { return (insn >> pos) & ((1 << l) - 1); } |
| 92 | |
| 93 | // Get the encoding field "op31" of 3-source data processing insns. "op31" is |
| 94 | // the name defined in armv8 insn manual C3.5.9. |
| 95 | static unsigned int |
| 96 | aarch64_op31(Insntype insn) |
| 97 | { return aarch64_bits(insn, 21, 3); } |
| 98 | |
| 99 | // Get the encoding field "ra" of 3-source data processing insns. "ra" is the |
| 100 | // third source register. See armv8 insn manual C3.5.9. |
| 101 | static unsigned int |
| 102 | aarch64_ra(Insntype insn) |
| 103 | { return aarch64_bits(insn, 10, 5); } |
| 104 | |
| 105 | static bool |
| 106 | is_adr(const Insntype insn) |
| 107 | { return (insn & 0x9F000000) == 0x10000000; } |
| 108 | |
| 109 | static bool |
| 110 | is_adrp(const Insntype insn) |
| 111 | { return (insn & 0x9F000000) == 0x90000000; } |
| 112 | |
| 113 | static unsigned int |
| 114 | aarch64_rm(const Insntype insn) |
| 115 | { return aarch64_bits(insn, 16, 5); } |
| 116 | |
| 117 | static unsigned int |
| 118 | aarch64_rn(const Insntype insn) |
| 119 | { return aarch64_bits(insn, 5, 5); } |
| 120 | |
| 121 | static unsigned int |
| 122 | aarch64_rd(const Insntype insn) |
| 123 | { return aarch64_bits(insn, 0, 5); } |
| 124 | |
| 125 | static unsigned int |
| 126 | aarch64_rt(const Insntype insn) |
| 127 | { return aarch64_bits(insn, 0, 5); } |
| 128 | |
| 129 | static unsigned int |
| 130 | aarch64_rt2(const Insntype insn) |
| 131 | { return aarch64_bits(insn, 10, 5); } |
| 132 | |
| 133 | // Encode imm21 into adr. Signed imm21 is in the range of [-1M, 1M). |
| 134 | static Insntype |
| 135 | aarch64_adr_encode_imm(Insntype adr, int imm21) |
| 136 | { |
| 137 | gold_assert(is_adr(adr)); |
| 138 | gold_assert(-(1 << 20) <= imm21 && imm21 < (1 << 20)); |
| 139 | const int mask19 = (1 << 19) - 1; |
| 140 | const int mask2 = 3; |
| 141 | adr &= ~((mask19 << 5) | (mask2 << 29)); |
| 142 | adr |= ((imm21 & mask2) << 29) | (((imm21 >> 2) & mask19) << 5); |
| 143 | return adr; |
| 144 | } |
| 145 | |
| 146 | // Retrieve encoded adrp 33-bit signed imm value. This value is obtained by |
| 147 | // 21-bit signed imm encoded in the insn multiplied by 4k (page size) and |
| 148 | // 64-bit sign-extended, resulting in [-4G, 4G) with 12-lsb being 0. |
| 149 | static int64_t |
| 150 | aarch64_adrp_decode_imm(const Insntype adrp) |
| 151 | { |
| 152 | const int mask19 = (1 << 19) - 1; |
| 153 | const int mask2 = 3; |
| 154 | gold_assert(is_adrp(adrp)); |
| 155 | // 21-bit imm encoded in adrp. |
| 156 | uint64_t imm = ((adrp >> 29) & mask2) | (((adrp >> 5) & mask19) << 2); |
| 157 | // Retrieve msb of 21-bit-signed imm for sign extension. |
| 158 | uint64_t msbt = (imm >> 20) & 1; |
| 159 | // Real value is imm multipled by 4k. Value now has 33-bit information. |
| 160 | int64_t value = imm << 12; |
| 161 | // Sign extend to 64-bit by repeating msbt 31 (64-33) times and merge it |
| 162 | // with value. |
| 163 | return ((((uint64_t)(1) << 32) - msbt) << 33) | value; |
| 164 | } |
| 165 | |
| 166 | static bool |
| 167 | aarch64_b(const Insntype insn) |
| 168 | { return (insn & 0xFC000000) == 0x14000000; } |
| 169 | |
| 170 | static bool |
| 171 | aarch64_bl(const Insntype insn) |
| 172 | { return (insn & 0xFC000000) == 0x94000000; } |
| 173 | |
| 174 | static bool |
| 175 | aarch64_blr(const Insntype insn) |
| 176 | { return (insn & 0xFFFFFC1F) == 0xD63F0000; } |
| 177 | |
| 178 | static bool |
| 179 | aarch64_br(const Insntype insn) |
| 180 | { return (insn & 0xFFFFFC1F) == 0xD61F0000; } |
| 181 | |
| 182 | // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for |
| 183 | // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops. |
| 184 | static bool |
| 185 | aarch64_ld(Insntype insn) { return aarch64_bit(insn, 22) == 1; } |
| 186 | |
| 187 | static bool |
| 188 | aarch64_ldst(Insntype insn) |
| 189 | { return (insn & 0x0a000000) == 0x08000000; } |
| 190 | |
| 191 | static bool |
| 192 | aarch64_ldst_ex(Insntype insn) |
| 193 | { return (insn & 0x3f000000) == 0x08000000; } |
| 194 | |
| 195 | static bool |
| 196 | aarch64_ldst_pcrel(Insntype insn) |
| 197 | { return (insn & 0x3b000000) == 0x18000000; } |
| 198 | |
| 199 | static bool |
| 200 | aarch64_ldst_nap(Insntype insn) |
| 201 | { return (insn & 0x3b800000) == 0x28000000; } |
| 202 | |
| 203 | static bool |
| 204 | aarch64_ldstp_pi(Insntype insn) |
| 205 | { return (insn & 0x3b800000) == 0x28800000; } |
| 206 | |
| 207 | static bool |
| 208 | aarch64_ldstp_o(Insntype insn) |
| 209 | { return (insn & 0x3b800000) == 0x29000000; } |
| 210 | |
| 211 | static bool |
| 212 | aarch64_ldstp_pre(Insntype insn) |
| 213 | { return (insn & 0x3b800000) == 0x29800000; } |
| 214 | |
| 215 | static bool |
| 216 | aarch64_ldst_ui(Insntype insn) |
| 217 | { return (insn & 0x3b200c00) == 0x38000000; } |
| 218 | |
| 219 | static bool |
| 220 | aarch64_ldst_piimm(Insntype insn) |
| 221 | { return (insn & 0x3b200c00) == 0x38000400; } |
| 222 | |
| 223 | static bool |
| 224 | aarch64_ldst_u(Insntype insn) |
| 225 | { return (insn & 0x3b200c00) == 0x38000800; } |
| 226 | |
| 227 | static bool |
| 228 | aarch64_ldst_preimm(Insntype insn) |
| 229 | { return (insn & 0x3b200c00) == 0x38000c00; } |
| 230 | |
| 231 | static bool |
| 232 | aarch64_ldst_ro(Insntype insn) |
| 233 | { return (insn & 0x3b200c00) == 0x38200800; } |
| 234 | |
| 235 | static bool |
| 236 | aarch64_ldst_uimm(Insntype insn) |
| 237 | { return (insn & 0x3b000000) == 0x39000000; } |
| 238 | |
| 239 | static bool |
| 240 | aarch64_ldst_simd_m(Insntype insn) |
| 241 | { return (insn & 0xbfbf0000) == 0x0c000000; } |
| 242 | |
| 243 | static bool |
| 244 | aarch64_ldst_simd_m_pi(Insntype insn) |
| 245 | { return (insn & 0xbfa00000) == 0x0c800000; } |
| 246 | |
| 247 | static bool |
| 248 | aarch64_ldst_simd_s(Insntype insn) |
| 249 | { return (insn & 0xbf9f0000) == 0x0d000000; } |
| 250 | |
| 251 | static bool |
| 252 | aarch64_ldst_simd_s_pi(Insntype insn) |
| 253 | { return (insn & 0xbf800000) == 0x0d800000; } |
| 254 | |
| 255 | // Classify an INSN if it is indeed a load/store. Return true if INSN is a |
| 256 | // LD/ST instruction otherwise return false. For scalar LD/ST instructions |
| 257 | // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair |
| 258 | // instructions PAIR is TRUE, RT and RT2 are returned. |
| 259 | static bool |
| 260 | aarch64_mem_op_p(Insntype insn, unsigned int *rt, unsigned int *rt2, |
| 261 | bool *pair, bool *load) |
| 262 | { |
| 263 | uint32_t opcode; |
| 264 | unsigned int r; |
| 265 | uint32_t opc = 0; |
| 266 | uint32_t v = 0; |
| 267 | uint32_t opc_v = 0; |
| 268 | |
| 269 | /* Bail out quickly if INSN doesn't fall into the the load-store |
| 270 | encoding space. */ |
| 271 | if (!aarch64_ldst (insn)) |
| 272 | return false; |
| 273 | |
| 274 | *pair = false; |
| 275 | *load = false; |
| 276 | if (aarch64_ldst_ex (insn)) |
| 277 | { |
| 278 | *rt = aarch64_rt (insn); |
| 279 | *rt2 = *rt; |
| 280 | if (aarch64_bit (insn, 21) == 1) |
| 281 | { |
| 282 | *pair = true; |
| 283 | *rt2 = aarch64_rt2 (insn); |
| 284 | } |
| 285 | *load = aarch64_ld (insn); |
| 286 | return true; |
| 287 | } |
| 288 | else if (aarch64_ldst_nap (insn) |
| 289 | || aarch64_ldstp_pi (insn) |
| 290 | || aarch64_ldstp_o (insn) |
| 291 | || aarch64_ldstp_pre (insn)) |
| 292 | { |
| 293 | *pair = true; |
| 294 | *rt = aarch64_rt (insn); |
| 295 | *rt2 = aarch64_rt2 (insn); |
| 296 | *load = aarch64_ld (insn); |
| 297 | return true; |
| 298 | } |
| 299 | else if (aarch64_ldst_pcrel (insn) |
| 300 | || aarch64_ldst_ui (insn) |
| 301 | || aarch64_ldst_piimm (insn) |
| 302 | || aarch64_ldst_u (insn) |
| 303 | || aarch64_ldst_preimm (insn) |
| 304 | || aarch64_ldst_ro (insn) |
| 305 | || aarch64_ldst_uimm (insn)) |
| 306 | { |
| 307 | *rt = aarch64_rt (insn); |
| 308 | *rt2 = *rt; |
| 309 | if (aarch64_ldst_pcrel (insn)) |
| 310 | *load = true; |
| 311 | opc = aarch64_bits (insn, 22, 2); |
| 312 | v = aarch64_bit (insn, 26); |
| 313 | opc_v = opc | (v << 2); |
| 314 | *load = (opc_v == 1 || opc_v == 2 || opc_v == 3 |
| 315 | || opc_v == 5 || opc_v == 7); |
| 316 | return true; |
| 317 | } |
| 318 | else if (aarch64_ldst_simd_m (insn) |
| 319 | || aarch64_ldst_simd_m_pi (insn)) |
| 320 | { |
| 321 | *rt = aarch64_rt (insn); |
| 322 | *load = aarch64_bit (insn, 22); |
| 323 | opcode = (insn >> 12) & 0xf; |
| 324 | switch (opcode) |
| 325 | { |
| 326 | case 0: |
| 327 | case 2: |
| 328 | *rt2 = *rt + 3; |
| 329 | break; |
| 330 | |
| 331 | case 4: |
| 332 | case 6: |
| 333 | *rt2 = *rt + 2; |
| 334 | break; |
| 335 | |
| 336 | case 7: |
| 337 | *rt2 = *rt; |
| 338 | break; |
| 339 | |
| 340 | case 8: |
| 341 | case 10: |
| 342 | *rt2 = *rt + 1; |
| 343 | break; |
| 344 | |
| 345 | default: |
| 346 | return false; |
| 347 | } |
| 348 | return true; |
| 349 | } |
| 350 | else if (aarch64_ldst_simd_s (insn) |
| 351 | || aarch64_ldst_simd_s_pi (insn)) |
| 352 | { |
| 353 | *rt = aarch64_rt (insn); |
| 354 | r = (insn >> 21) & 1; |
| 355 | *load = aarch64_bit (insn, 22); |
| 356 | opcode = (insn >> 13) & 0x7; |
| 357 | switch (opcode) |
| 358 | { |
| 359 | case 0: |
| 360 | case 2: |
| 361 | case 4: |
| 362 | *rt2 = *rt + r; |
| 363 | break; |
| 364 | |
| 365 | case 1: |
| 366 | case 3: |
| 367 | case 5: |
| 368 | *rt2 = *rt + (r == 0 ? 2 : 3); |
| 369 | break; |
| 370 | |
| 371 | case 6: |
| 372 | *rt2 = *rt + r; |
| 373 | break; |
| 374 | |
| 375 | case 7: |
| 376 | *rt2 = *rt + (r == 0 ? 2 : 3); |
| 377 | break; |
| 378 | |
| 379 | default: |
| 380 | return false; |
| 381 | } |
| 382 | return true; |
| 383 | } |
| 384 | return false; |
| 385 | } // End of "aarch64_mem_op_p". |
| 386 | |
| 387 | // Return true if INSN is mac insn. |
| 388 | static bool |
| 389 | aarch64_mac(Insntype insn) |
| 390 | { return (insn & 0xff000000) == 0x9b000000; } |
| 391 | |
| 392 | // Return true if INSN is multiply-accumulate. |
| 393 | // (This is similar to implementaton in elfnn-aarch64.c.) |
| 394 | static bool |
| 395 | aarch64_mlxl(Insntype insn) |
| 396 | { |
| 397 | uint32_t op31 = aarch64_op31(insn); |
| 398 | if (aarch64_mac(insn) |
| 399 | && (op31 == 0 || op31 == 1 || op31 == 5) |
| 400 | /* Exclude MUL instructions which are encoded as a multiple-accumulate |
| 401 | with RA = XZR. */ |
| 402 | && aarch64_ra(insn) != AARCH64_ZR) |
| 403 | { |
| 404 | return true; |
| 405 | } |
| 406 | return false; |
| 407 | } |
| 408 | }; // End of "AArch64_insn_utilities". |
| 409 | |
| 410 | |
| 411 | // Insn length in byte. |
| 412 | |
| 413 | template<bool big_endian> |
| 414 | const int AArch64_insn_utilities<big_endian>::BYTES_PER_INSN = 4; |
| 415 | |
| 416 | |
| 417 | // Zero register encoding - 31. |
| 418 | |
| 419 | template<bool big_endian> |
| 420 | const unsigned int AArch64_insn_utilities<big_endian>::AARCH64_ZR = 0x1f; |
| 421 | |
| 422 | |
| 423 | // Output_data_got_aarch64 class. |
| 424 | |
| 425 | template<int size, bool big_endian> |
| 426 | class Output_data_got_aarch64 : public Output_data_got<size, big_endian> |
| 427 | { |
| 428 | public: |
| 429 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; |
| 430 | Output_data_got_aarch64(Symbol_table* symtab, Layout* layout) |
| 431 | : Output_data_got<size, big_endian>(), |
| 432 | symbol_table_(symtab), layout_(layout) |
| 433 | { } |
| 434 | |
| 435 | // Add a static entry for the GOT entry at OFFSET. GSYM is a global |
| 436 | // symbol and R_TYPE is the code of a dynamic relocation that needs to be |
| 437 | // applied in a static link. |
| 438 | void |
| 439 | add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) |
| 440 | { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); } |
| 441 | |
| 442 | |
| 443 | // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object |
| 444 | // defining a local symbol with INDEX. R_TYPE is the code of a dynamic |
| 445 | // relocation that needs to be applied in a static link. |
| 446 | void |
| 447 | add_static_reloc(unsigned int got_offset, unsigned int r_type, |
| 448 | Sized_relobj_file<size, big_endian>* relobj, |
| 449 | unsigned int index) |
| 450 | { |
| 451 | this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj, |
| 452 | index)); |
| 453 | } |
| 454 | |
| 455 | |
| 456 | protected: |
| 457 | // Write out the GOT table. |
| 458 | void |
| 459 | do_write(Output_file* of) { |
| 460 | // The first entry in the GOT is the address of the .dynamic section. |
| 461 | gold_assert(this->data_size() >= size / 8); |
| 462 | Output_section* dynamic = this->layout_->dynamic_section(); |
| 463 | Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); |
| 464 | this->replace_constant(0, dynamic_addr); |
| 465 | Output_data_got<size, big_endian>::do_write(of); |
| 466 | |
| 467 | // Handling static relocs |
| 468 | if (this->static_relocs_.empty()) |
| 469 | return; |
| 470 | |
| 471 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 472 | |
| 473 | gold_assert(parameters->doing_static_link()); |
| 474 | const off_t offset = this->offset(); |
| 475 | const section_size_type oview_size = |
| 476 | convert_to_section_size_type(this->data_size()); |
| 477 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 478 | |
| 479 | Output_segment* tls_segment = this->layout_->tls_segment(); |
| 480 | gold_assert(tls_segment != NULL); |
| 481 | |
| 482 | AArch64_address aligned_tcb_address = |
| 483 | align_address(Target_aarch64<size, big_endian>::TCB_SIZE, |
| 484 | tls_segment->maximum_alignment()); |
| 485 | |
| 486 | for (size_t i = 0; i < this->static_relocs_.size(); ++i) |
| 487 | { |
| 488 | Static_reloc& reloc(this->static_relocs_[i]); |
| 489 | AArch64_address value; |
| 490 | |
| 491 | if (!reloc.symbol_is_global()) |
| 492 | { |
| 493 | Sized_relobj_file<size, big_endian>* object = reloc.relobj(); |
| 494 | const Symbol_value<size>* psymval = |
| 495 | reloc.relobj()->local_symbol(reloc.index()); |
| 496 | |
| 497 | // We are doing static linking. Issue an error and skip this |
| 498 | // relocation if the symbol is undefined or in a discarded_section. |
| 499 | bool is_ordinary; |
| 500 | unsigned int shndx = psymval->input_shndx(&is_ordinary); |
| 501 | if ((shndx == elfcpp::SHN_UNDEF) |
| 502 | || (is_ordinary |
| 503 | && shndx != elfcpp::SHN_UNDEF |
| 504 | && !object->is_section_included(shndx) |
| 505 | && !this->symbol_table_->is_section_folded(object, shndx))) |
| 506 | { |
| 507 | gold_error(_("undefined or discarded local symbol %u from " |
| 508 | " object %s in GOT"), |
| 509 | reloc.index(), reloc.relobj()->name().c_str()); |
| 510 | continue; |
| 511 | } |
| 512 | value = psymval->value(object, 0); |
| 513 | } |
| 514 | else |
| 515 | { |
| 516 | const Symbol* gsym = reloc.symbol(); |
| 517 | gold_assert(gsym != NULL); |
| 518 | if (gsym->is_forwarder()) |
| 519 | gsym = this->symbol_table_->resolve_forwards(gsym); |
| 520 | |
| 521 | // We are doing static linking. Issue an error and skip this |
| 522 | // relocation if the symbol is undefined or in a discarded_section |
| 523 | // unless it is a weakly_undefined symbol. |
| 524 | if ((gsym->is_defined_in_discarded_section() |
| 525 | || gsym->is_undefined()) |
| 526 | && !gsym->is_weak_undefined()) |
| 527 | { |
| 528 | gold_error(_("undefined or discarded symbol %s in GOT"), |
| 529 | gsym->name()); |
| 530 | continue; |
| 531 | } |
| 532 | |
| 533 | if (!gsym->is_weak_undefined()) |
| 534 | { |
| 535 | const Sized_symbol<size>* sym = |
| 536 | static_cast<const Sized_symbol<size>*>(gsym); |
| 537 | value = sym->value(); |
| 538 | } |
| 539 | else |
| 540 | value = 0; |
| 541 | } |
| 542 | |
| 543 | unsigned got_offset = reloc.got_offset(); |
| 544 | gold_assert(got_offset < oview_size); |
| 545 | |
| 546 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; |
| 547 | Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset); |
| 548 | Valtype x; |
| 549 | switch (reloc.r_type()) |
| 550 | { |
| 551 | case elfcpp::R_AARCH64_TLS_DTPREL64: |
| 552 | x = value; |
| 553 | break; |
| 554 | case elfcpp::R_AARCH64_TLS_TPREL64: |
| 555 | x = value + aligned_tcb_address; |
| 556 | break; |
| 557 | default: |
| 558 | gold_unreachable(); |
| 559 | } |
| 560 | elfcpp::Swap<size, big_endian>::writeval(wv, x); |
| 561 | } |
| 562 | |
| 563 | of->write_output_view(offset, oview_size, oview); |
| 564 | } |
| 565 | |
| 566 | private: |
| 567 | // Symbol table of the output object. |
| 568 | Symbol_table* symbol_table_; |
| 569 | // A pointer to the Layout class, so that we can find the .dynamic |
| 570 | // section when we write out the GOT section. |
| 571 | Layout* layout_; |
| 572 | |
| 573 | // This class represent dynamic relocations that need to be applied by |
| 574 | // gold because we are using TLS relocations in a static link. |
| 575 | class Static_reloc |
| 576 | { |
| 577 | public: |
| 578 | Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) |
| 579 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true) |
| 580 | { this->u_.global.symbol = gsym; } |
| 581 | |
| 582 | Static_reloc(unsigned int got_offset, unsigned int r_type, |
| 583 | Sized_relobj_file<size, big_endian>* relobj, unsigned int index) |
| 584 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false) |
| 585 | { |
| 586 | this->u_.local.relobj = relobj; |
| 587 | this->u_.local.index = index; |
| 588 | } |
| 589 | |
| 590 | // Return the GOT offset. |
| 591 | unsigned int |
| 592 | got_offset() const |
| 593 | { return this->got_offset_; } |
| 594 | |
| 595 | // Relocation type. |
| 596 | unsigned int |
| 597 | r_type() const |
| 598 | { return this->r_type_; } |
| 599 | |
| 600 | // Whether the symbol is global or not. |
| 601 | bool |
| 602 | symbol_is_global() const |
| 603 | { return this->symbol_is_global_; } |
| 604 | |
| 605 | // For a relocation against a global symbol, the global symbol. |
| 606 | Symbol* |
| 607 | symbol() const |
| 608 | { |
| 609 | gold_assert(this->symbol_is_global_); |
| 610 | return this->u_.global.symbol; |
| 611 | } |
| 612 | |
| 613 | // For a relocation against a local symbol, the defining object. |
| 614 | Sized_relobj_file<size, big_endian>* |
| 615 | relobj() const |
| 616 | { |
| 617 | gold_assert(!this->symbol_is_global_); |
| 618 | return this->u_.local.relobj; |
| 619 | } |
| 620 | |
| 621 | // For a relocation against a local symbol, the local symbol index. |
| 622 | unsigned int |
| 623 | index() const |
| 624 | { |
| 625 | gold_assert(!this->symbol_is_global_); |
| 626 | return this->u_.local.index; |
| 627 | } |
| 628 | |
| 629 | private: |
| 630 | // GOT offset of the entry to which this relocation is applied. |
| 631 | unsigned int got_offset_; |
| 632 | // Type of relocation. |
| 633 | unsigned int r_type_; |
| 634 | // Whether this relocation is against a global symbol. |
| 635 | bool symbol_is_global_; |
| 636 | // A global or local symbol. |
| 637 | union |
| 638 | { |
| 639 | struct |
| 640 | { |
| 641 | // For a global symbol, the symbol itself. |
| 642 | Symbol* symbol; |
| 643 | } global; |
| 644 | struct |
| 645 | { |
| 646 | // For a local symbol, the object defining the symbol. |
| 647 | Sized_relobj_file<size, big_endian>* relobj; |
| 648 | // For a local symbol, the symbol index. |
| 649 | unsigned int index; |
| 650 | } local; |
| 651 | } u_; |
| 652 | }; // End of inner class Static_reloc |
| 653 | |
| 654 | std::vector<Static_reloc> static_relocs_; |
| 655 | }; // End of Output_data_got_aarch64 |
| 656 | |
| 657 | |
| 658 | template<int size, bool big_endian> |
| 659 | class AArch64_input_section; |
| 660 | |
| 661 | |
| 662 | template<int size, bool big_endian> |
| 663 | class AArch64_output_section; |
| 664 | |
| 665 | |
| 666 | template<int size, bool big_endian> |
| 667 | class AArch64_relobj; |
| 668 | |
| 669 | |
| 670 | // Stub type enum constants. |
| 671 | |
| 672 | enum |
| 673 | { |
| 674 | ST_NONE = 0, |
| 675 | |
| 676 | // Using adrp/add pair, 4 insns (including alignment) without mem access, |
| 677 | // the fastest stub. This has a limited jump distance, which is tested by |
| 678 | // aarch64_valid_for_adrp_p. |
| 679 | ST_ADRP_BRANCH = 1, |
| 680 | |
| 681 | // Using ldr-absolute-address/br-register, 4 insns with 1 mem access, |
| 682 | // unlimited in jump distance. |
| 683 | ST_LONG_BRANCH_ABS = 2, |
| 684 | |
| 685 | // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1 |
| 686 | // mem access, slowest one. Only used in position independent executables. |
| 687 | ST_LONG_BRANCH_PCREL = 3, |
| 688 | |
| 689 | // Stub for erratum 843419 handling. |
| 690 | ST_E_843419 = 4, |
| 691 | |
| 692 | // Stub for erratum 835769 handling. |
| 693 | ST_E_835769 = 5, |
| 694 | |
| 695 | // Number of total stub types. |
| 696 | ST_NUMBER = 6 |
| 697 | }; |
| 698 | |
| 699 | |
| 700 | // Struct that wraps insns for a particular stub. All stub templates are |
| 701 | // created/initialized as constants by Stub_template_repertoire. |
| 702 | |
| 703 | template<bool big_endian> |
| 704 | struct Stub_template |
| 705 | { |
| 706 | const typename AArch64_insn_utilities<big_endian>::Insntype* insns; |
| 707 | const int insn_num; |
| 708 | }; |
| 709 | |
| 710 | |
| 711 | // Simple singleton class that creates/initializes/stores all types of stub |
| 712 | // templates. |
| 713 | |
| 714 | template<bool big_endian> |
| 715 | class Stub_template_repertoire |
| 716 | { |
| 717 | public: |
| 718 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; |
| 719 | |
| 720 | // Single static method to get stub template for a given stub type. |
| 721 | static const Stub_template<big_endian>* |
| 722 | get_stub_template(int type) |
| 723 | { |
| 724 | static Stub_template_repertoire<big_endian> singleton; |
| 725 | return singleton.stub_templates_[type]; |
| 726 | } |
| 727 | |
| 728 | private: |
| 729 | // Constructor - creates/initializes all stub templates. |
| 730 | Stub_template_repertoire(); |
| 731 | ~Stub_template_repertoire() |
| 732 | { } |
| 733 | |
| 734 | // Disallowing copy ctor and copy assignment operator. |
| 735 | Stub_template_repertoire(Stub_template_repertoire&); |
| 736 | Stub_template_repertoire& operator=(Stub_template_repertoire&); |
| 737 | |
| 738 | // Data that stores all insn templates. |
| 739 | const Stub_template<big_endian>* stub_templates_[ST_NUMBER]; |
| 740 | }; // End of "class Stub_template_repertoire". |
| 741 | |
| 742 | |
| 743 | // Constructor - creates/initilizes all stub templates. |
| 744 | |
| 745 | template<bool big_endian> |
| 746 | Stub_template_repertoire<big_endian>::Stub_template_repertoire() |
| 747 | { |
| 748 | // Insn array definitions. |
| 749 | const static Insntype ST_NONE_INSNS[] = {}; |
| 750 | |
| 751 | const static Insntype ST_ADRP_BRANCH_INSNS[] = |
| 752 | { |
| 753 | 0x90000010, /* adrp ip0, X */ |
| 754 | /* ADR_PREL_PG_HI21(X) */ |
| 755 | 0x91000210, /* add ip0, ip0, :lo12:X */ |
| 756 | /* ADD_ABS_LO12_NC(X) */ |
| 757 | 0xd61f0200, /* br ip0 */ |
| 758 | 0x00000000, /* alignment padding */ |
| 759 | }; |
| 760 | |
| 761 | const static Insntype ST_LONG_BRANCH_ABS_INSNS[] = |
| 762 | { |
| 763 | 0x58000050, /* ldr ip0, 0x8 */ |
| 764 | 0xd61f0200, /* br ip0 */ |
| 765 | 0x00000000, /* address field */ |
| 766 | 0x00000000, /* address fields */ |
| 767 | }; |
| 768 | |
| 769 | const static Insntype ST_LONG_BRANCH_PCREL_INSNS[] = |
| 770 | { |
| 771 | 0x58000090, /* ldr ip0, 0x10 */ |
| 772 | 0x10000011, /* adr ip1, #0 */ |
| 773 | 0x8b110210, /* add ip0, ip0, ip1 */ |
| 774 | 0xd61f0200, /* br ip0 */ |
| 775 | 0x00000000, /* address field */ |
| 776 | 0x00000000, /* address field */ |
| 777 | 0x00000000, /* alignment padding */ |
| 778 | 0x00000000, /* alignment padding */ |
| 779 | }; |
| 780 | |
| 781 | const static Insntype ST_E_843419_INSNS[] = |
| 782 | { |
| 783 | 0x00000000, /* Placeholder for erratum insn. */ |
| 784 | 0x14000000, /* b <label> */ |
| 785 | }; |
| 786 | |
| 787 | // ST_E_835769 has the same stub template as ST_E_843419. |
| 788 | const static Insntype* ST_E_835769_INSNS = ST_E_843419_INSNS; |
| 789 | |
| 790 | #define install_insn_template(T) \ |
| 791 | const static Stub_template<big_endian> template_##T = { \ |
| 792 | T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \ |
| 793 | this->stub_templates_[T] = &template_##T |
| 794 | |
| 795 | install_insn_template(ST_NONE); |
| 796 | install_insn_template(ST_ADRP_BRANCH); |
| 797 | install_insn_template(ST_LONG_BRANCH_ABS); |
| 798 | install_insn_template(ST_LONG_BRANCH_PCREL); |
| 799 | install_insn_template(ST_E_843419); |
| 800 | install_insn_template(ST_E_835769); |
| 801 | |
| 802 | #undef install_insn_template |
| 803 | } |
| 804 | |
| 805 | |
| 806 | // Base class for stubs. |
| 807 | |
| 808 | template<int size, bool big_endian> |
| 809 | class Stub_base |
| 810 | { |
| 811 | public: |
| 812 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 813 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; |
| 814 | |
| 815 | static const AArch64_address invalid_address = |
| 816 | static_cast<AArch64_address>(-1); |
| 817 | |
| 818 | static const section_offset_type invalid_offset = |
| 819 | static_cast<section_offset_type>(-1); |
| 820 | |
| 821 | Stub_base(int type) |
| 822 | : destination_address_(invalid_address), |
| 823 | offset_(invalid_offset), |
| 824 | type_(type) |
| 825 | {} |
| 826 | |
| 827 | ~Stub_base() |
| 828 | {} |
| 829 | |
| 830 | // Get stub type. |
| 831 | int |
| 832 | type() const |
| 833 | { return this->type_; } |
| 834 | |
| 835 | // Get stub template that provides stub insn information. |
| 836 | const Stub_template<big_endian>* |
| 837 | stub_template() const |
| 838 | { |
| 839 | return Stub_template_repertoire<big_endian>:: |
| 840 | get_stub_template(this->type()); |
| 841 | } |
| 842 | |
| 843 | // Get destination address. |
| 844 | AArch64_address |
| 845 | destination_address() const |
| 846 | { |
| 847 | gold_assert(this->destination_address_ != this->invalid_address); |
| 848 | return this->destination_address_; |
| 849 | } |
| 850 | |
| 851 | // Set destination address. |
| 852 | void |
| 853 | set_destination_address(AArch64_address address) |
| 854 | { |
| 855 | gold_assert(address != this->invalid_address); |
| 856 | this->destination_address_ = address; |
| 857 | } |
| 858 | |
| 859 | // Reset the destination address. |
| 860 | void |
| 861 | reset_destination_address() |
| 862 | { this->destination_address_ = this->invalid_address; } |
| 863 | |
| 864 | // Get offset of code stub. For Reloc_stub, it is the offset from the |
| 865 | // beginning of its containing stub table; for Erratum_stub, it is the offset |
| 866 | // from the end of reloc_stubs. |
| 867 | section_offset_type |
| 868 | offset() const |
| 869 | { |
| 870 | gold_assert(this->offset_ != this->invalid_offset); |
| 871 | return this->offset_; |
| 872 | } |
| 873 | |
| 874 | // Set stub offset. |
| 875 | void |
| 876 | set_offset(section_offset_type offset) |
| 877 | { this->offset_ = offset; } |
| 878 | |
| 879 | // Return the stub insn. |
| 880 | const Insntype* |
| 881 | insns() const |
| 882 | { return this->stub_template()->insns; } |
| 883 | |
| 884 | // Return num of stub insns. |
| 885 | unsigned int |
| 886 | insn_num() const |
| 887 | { return this->stub_template()->insn_num; } |
| 888 | |
| 889 | // Get size of the stub. |
| 890 | int |
| 891 | stub_size() const |
| 892 | { |
| 893 | return this->insn_num() * |
| 894 | AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; |
| 895 | } |
| 896 | |
| 897 | // Write stub to output file. |
| 898 | void |
| 899 | write(unsigned char* view, section_size_type view_size) |
| 900 | { this->do_write(view, view_size); } |
| 901 | |
| 902 | protected: |
| 903 | // Abstract method to be implemented by sub-classes. |
| 904 | virtual void |
| 905 | do_write(unsigned char*, section_size_type) = 0; |
| 906 | |
| 907 | private: |
| 908 | // The last insn of a stub is a jump to destination insn. This field records |
| 909 | // the destination address. |
| 910 | AArch64_address destination_address_; |
| 911 | // The stub offset. Note this has difference interpretations between an |
| 912 | // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the |
| 913 | // beginning of the containing stub_table, whereas for Erratum_stub, this is |
| 914 | // the offset from the end of reloc_stubs. |
| 915 | section_offset_type offset_; |
| 916 | // Stub type. |
| 917 | const int type_; |
| 918 | }; // End of "Stub_base". |
| 919 | |
| 920 | |
| 921 | // Erratum stub class. An erratum stub differs from a reloc stub in that for |
| 922 | // each erratum occurrence, we generate an erratum stub. We never share erratum |
| 923 | // stubs, whereas for reloc stubs, different branches insns share a single reloc |
| 924 | // stub as long as the branch targets are the same. (More to the point, reloc |
| 925 | // stubs can be shared because they're used to reach a specific target, whereas |
| 926 | // erratum stubs branch back to the original control flow.) |
| 927 | |
| 928 | template<int size, bool big_endian> |
| 929 | class Erratum_stub : public Stub_base<size, big_endian> |
| 930 | { |
| 931 | public: |
| 932 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 933 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 934 | typedef AArch64_insn_utilities<big_endian> Insn_utilities; |
| 935 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; |
| 936 | |
| 937 | static const int STUB_ADDR_ALIGN; |
| 938 | |
| 939 | static const Insntype invalid_insn = static_cast<Insntype>(-1); |
| 940 | |
| 941 | Erratum_stub(The_aarch64_relobj* relobj, int type, |
| 942 | unsigned shndx, unsigned int sh_offset) |
| 943 | : Stub_base<size, big_endian>(type), relobj_(relobj), |
| 944 | shndx_(shndx), sh_offset_(sh_offset), |
| 945 | erratum_insn_(invalid_insn), |
| 946 | erratum_address_(this->invalid_address) |
| 947 | {} |
| 948 | |
| 949 | ~Erratum_stub() {} |
| 950 | |
| 951 | // Return the object that contains the erratum. |
| 952 | The_aarch64_relobj* |
| 953 | relobj() |
| 954 | { return this->relobj_; } |
| 955 | |
| 956 | // Get section index of the erratum. |
| 957 | unsigned int |
| 958 | shndx() const |
| 959 | { return this->shndx_; } |
| 960 | |
| 961 | // Get section offset of the erratum. |
| 962 | unsigned int |
| 963 | sh_offset() const |
| 964 | { return this->sh_offset_; } |
| 965 | |
| 966 | // Get the erratum insn. This is the insn located at erratum_insn_address. |
| 967 | Insntype |
| 968 | erratum_insn() const |
| 969 | { |
| 970 | gold_assert(this->erratum_insn_ != this->invalid_insn); |
| 971 | return this->erratum_insn_; |
| 972 | } |
| 973 | |
| 974 | // Set the insn that the erratum happens to. |
| 975 | void |
| 976 | set_erratum_insn(Insntype insn) |
| 977 | { this->erratum_insn_ = insn; } |
| 978 | |
| 979 | // For 843419, the erratum insn is ld/st xt, [xn, #uimm], which may be a |
| 980 | // relocation spot, in this case, the erratum_insn_ recorded at scanning phase |
| 981 | // is no longer the one we want to write out to the stub, update erratum_insn_ |
| 982 | // with relocated version. Also note that in this case xn must not be "PC", so |
| 983 | // it is safe to move the erratum insn from the origin place to the stub. For |
| 984 | // 835769, the erratum insn is multiply-accumulate insn, which could not be a |
| 985 | // relocation spot (assertion added though). |
| 986 | void |
| 987 | update_erratum_insn(Insntype insn) |
| 988 | { |
| 989 | gold_assert(this->erratum_insn_ != this->invalid_insn); |
| 990 | switch (this->type()) |
| 991 | { |
| 992 | case ST_E_843419: |
| 993 | gold_assert(Insn_utilities::aarch64_ldst_uimm(insn)); |
| 994 | gold_assert(Insn_utilities::aarch64_ldst_uimm(this->erratum_insn())); |
| 995 | gold_assert(Insn_utilities::aarch64_rd(insn) == |
| 996 | Insn_utilities::aarch64_rd(this->erratum_insn())); |
| 997 | gold_assert(Insn_utilities::aarch64_rn(insn) == |
| 998 | Insn_utilities::aarch64_rn(this->erratum_insn())); |
| 999 | // Update plain ld/st insn with relocated insn. |
| 1000 | this->erratum_insn_ = insn; |
| 1001 | break; |
| 1002 | case ST_E_835769: |
| 1003 | gold_assert(insn == this->erratum_insn()); |
| 1004 | break; |
| 1005 | default: |
| 1006 | gold_unreachable(); |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | |
| 1011 | // Return the address where an erratum must be done. |
| 1012 | AArch64_address |
| 1013 | erratum_address() const |
| 1014 | { |
| 1015 | gold_assert(this->erratum_address_ != this->invalid_address); |
| 1016 | return this->erratum_address_; |
| 1017 | } |
| 1018 | |
| 1019 | // Set the address where an erratum must be done. |
| 1020 | void |
| 1021 | set_erratum_address(AArch64_address addr) |
| 1022 | { this->erratum_address_ = addr; } |
| 1023 | |
| 1024 | // Comparator used to group Erratum_stubs in a set by (obj, shndx, |
| 1025 | // sh_offset). We do not include 'type' in the calculation, becuase there is |
| 1026 | // at most one stub type at (obj, shndx, sh_offset). |
| 1027 | bool |
| 1028 | operator<(const Erratum_stub<size, big_endian>& k) const |
| 1029 | { |
| 1030 | if (this == &k) |
| 1031 | return false; |
| 1032 | // We group stubs by relobj. |
| 1033 | if (this->relobj_ != k.relobj_) |
| 1034 | return this->relobj_ < k.relobj_; |
| 1035 | // Then by section index. |
| 1036 | if (this->shndx_ != k.shndx_) |
| 1037 | return this->shndx_ < k.shndx_; |
| 1038 | // Lastly by section offset. |
| 1039 | return this->sh_offset_ < k.sh_offset_; |
| 1040 | } |
| 1041 | |
| 1042 | protected: |
| 1043 | virtual void |
| 1044 | do_write(unsigned char*, section_size_type); |
| 1045 | |
| 1046 | private: |
| 1047 | // The object that needs to be fixed. |
| 1048 | The_aarch64_relobj* relobj_; |
| 1049 | // The shndx in the object that needs to be fixed. |
| 1050 | const unsigned int shndx_; |
| 1051 | // The section offset in the obejct that needs to be fixed. |
| 1052 | const unsigned int sh_offset_; |
| 1053 | // The insn to be fixed. |
| 1054 | Insntype erratum_insn_; |
| 1055 | // The address of the above insn. |
| 1056 | AArch64_address erratum_address_; |
| 1057 | }; // End of "Erratum_stub". |
| 1058 | |
| 1059 | |
| 1060 | // Erratum sub class to wrap additional info needed by 843419. In fixing this |
| 1061 | // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need |
| 1062 | // adrp's code position (two or three insns before erratum insn itself). |
| 1063 | |
| 1064 | template<int size, bool big_endian> |
| 1065 | class E843419_stub : public Erratum_stub<size, big_endian> |
| 1066 | { |
| 1067 | public: |
| 1068 | typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype; |
| 1069 | |
| 1070 | E843419_stub(AArch64_relobj<size, big_endian>* relobj, |
| 1071 | unsigned int shndx, unsigned int sh_offset, |
| 1072 | unsigned int adrp_sh_offset) |
| 1073 | : Erratum_stub<size, big_endian>(relobj, ST_E_843419, shndx, sh_offset), |
| 1074 | adrp_sh_offset_(adrp_sh_offset) |
| 1075 | {} |
| 1076 | |
| 1077 | unsigned int |
| 1078 | adrp_sh_offset() const |
| 1079 | { return this->adrp_sh_offset_; } |
| 1080 | |
| 1081 | private: |
| 1082 | // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we |
| 1083 | // can can obtain it from its parent.) |
| 1084 | const unsigned int adrp_sh_offset_; |
| 1085 | }; |
| 1086 | |
| 1087 | |
| 1088 | template<int size, bool big_endian> |
| 1089 | const int Erratum_stub<size, big_endian>::STUB_ADDR_ALIGN = 4; |
| 1090 | |
| 1091 | // Comparator used in set definition. |
| 1092 | template<int size, bool big_endian> |
| 1093 | struct Erratum_stub_less |
| 1094 | { |
| 1095 | bool |
| 1096 | operator()(const Erratum_stub<size, big_endian>* s1, |
| 1097 | const Erratum_stub<size, big_endian>* s2) const |
| 1098 | { return *s1 < *s2; } |
| 1099 | }; |
| 1100 | |
| 1101 | // Erratum_stub implementation for writing stub to output file. |
| 1102 | |
| 1103 | template<int size, bool big_endian> |
| 1104 | void |
| 1105 | Erratum_stub<size, big_endian>::do_write(unsigned char* view, section_size_type) |
| 1106 | { |
| 1107 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 1108 | const Insntype* insns = this->insns(); |
| 1109 | uint32_t num_insns = this->insn_num(); |
| 1110 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 1111 | // For current implemented erratum 843419 and 835769, the first insn in the |
| 1112 | // stub is always a copy of the problematic insn (in 843419, the mem access |
| 1113 | // insn, in 835769, the mac insn), followed by a jump-back. |
| 1114 | elfcpp::Swap<32, big_endian>::writeval(ip, this->erratum_insn()); |
| 1115 | for (uint32_t i = 1; i < num_insns; ++i) |
| 1116 | elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]); |
| 1117 | } |
| 1118 | |
| 1119 | |
| 1120 | // Reloc stub class. |
| 1121 | |
| 1122 | template<int size, bool big_endian> |
| 1123 | class Reloc_stub : public Stub_base<size, big_endian> |
| 1124 | { |
| 1125 | public: |
| 1126 | typedef Reloc_stub<size, big_endian> This; |
| 1127 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 1128 | |
| 1129 | // Branch range. This is used to calculate the section group size, as well as |
| 1130 | // determine whether a stub is needed. |
| 1131 | static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2; |
| 1132 | static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2); |
| 1133 | |
| 1134 | // Constant used to determine if an offset fits in the adrp instruction |
| 1135 | // encoding. |
| 1136 | static const int MAX_ADRP_IMM = (1 << 20) - 1; |
| 1137 | static const int MIN_ADRP_IMM = -(1 << 20); |
| 1138 | |
| 1139 | static const int BYTES_PER_INSN = 4; |
| 1140 | static const int STUB_ADDR_ALIGN; |
| 1141 | |
| 1142 | // Determine whether the offset fits in the jump/branch instruction. |
| 1143 | static bool |
| 1144 | aarch64_valid_branch_offset_p(int64_t offset) |
| 1145 | { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; } |
| 1146 | |
| 1147 | // Determine whether the offset fits in the adrp immediate field. |
| 1148 | static bool |
| 1149 | aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest) |
| 1150 | { |
| 1151 | typedef AArch64_relocate_functions<size, big_endian> Reloc; |
| 1152 | int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12; |
| 1153 | return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM; |
| 1154 | } |
| 1155 | |
| 1156 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is |
| 1157 | // needed. |
| 1158 | static int |
| 1159 | stub_type_for_reloc(unsigned int r_type, AArch64_address address, |
| 1160 | AArch64_address target); |
| 1161 | |
| 1162 | Reloc_stub(int type) |
| 1163 | : Stub_base<size, big_endian>(type) |
| 1164 | { } |
| 1165 | |
| 1166 | ~Reloc_stub() |
| 1167 | { } |
| 1168 | |
| 1169 | // The key class used to index the stub instance in the stub table's stub map. |
| 1170 | class Key |
| 1171 | { |
| 1172 | public: |
| 1173 | Key(int type, const Symbol* symbol, const Relobj* relobj, |
| 1174 | unsigned int r_sym, int32_t addend) |
| 1175 | : type_(type), addend_(addend) |
| 1176 | { |
| 1177 | if (symbol != NULL) |
| 1178 | { |
| 1179 | this->r_sym_ = Reloc_stub::invalid_index; |
| 1180 | this->u_.symbol = symbol; |
| 1181 | } |
| 1182 | else |
| 1183 | { |
| 1184 | gold_assert(relobj != NULL && r_sym != invalid_index); |
| 1185 | this->r_sym_ = r_sym; |
| 1186 | this->u_.relobj = relobj; |
| 1187 | } |
| 1188 | } |
| 1189 | |
| 1190 | ~Key() |
| 1191 | { } |
| 1192 | |
| 1193 | // Return stub type. |
| 1194 | int |
| 1195 | type() const |
| 1196 | { return this->type_; } |
| 1197 | |
| 1198 | // Return the local symbol index or invalid_index. |
| 1199 | unsigned int |
| 1200 | r_sym() const |
| 1201 | { return this->r_sym_; } |
| 1202 | |
| 1203 | // Return the symbol if there is one. |
| 1204 | const Symbol* |
| 1205 | symbol() const |
| 1206 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } |
| 1207 | |
| 1208 | // Return the relobj if there is one. |
| 1209 | const Relobj* |
| 1210 | relobj() const |
| 1211 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } |
| 1212 | |
| 1213 | // Whether this equals to another key k. |
| 1214 | bool |
| 1215 | eq(const Key& k) const |
| 1216 | { |
| 1217 | return ((this->type_ == k.type_) |
| 1218 | && (this->r_sym_ == k.r_sym_) |
| 1219 | && ((this->r_sym_ != Reloc_stub::invalid_index) |
| 1220 | ? (this->u_.relobj == k.u_.relobj) |
| 1221 | : (this->u_.symbol == k.u_.symbol)) |
| 1222 | && (this->addend_ == k.addend_)); |
| 1223 | } |
| 1224 | |
| 1225 | // Return a hash value. |
| 1226 | size_t |
| 1227 | hash_value() const |
| 1228 | { |
| 1229 | size_t name_hash_value = gold::string_hash<char>( |
| 1230 | (this->r_sym_ != Reloc_stub::invalid_index) |
| 1231 | ? this->u_.relobj->name().c_str() |
| 1232 | : this->u_.symbol->name()); |
| 1233 | // We only have 4 stub types. |
| 1234 | size_t stub_type_hash_value = 0x03 & this->type_; |
| 1235 | return (name_hash_value |
| 1236 | ^ stub_type_hash_value |
| 1237 | ^ ((this->r_sym_ & 0x3fff) << 2) |
| 1238 | ^ ((this->addend_ & 0xffff) << 16)); |
| 1239 | } |
| 1240 | |
| 1241 | // Functors for STL associative containers. |
| 1242 | struct hash |
| 1243 | { |
| 1244 | size_t |
| 1245 | operator()(const Key& k) const |
| 1246 | { return k.hash_value(); } |
| 1247 | }; |
| 1248 | |
| 1249 | struct equal_to |
| 1250 | { |
| 1251 | bool |
| 1252 | operator()(const Key& k1, const Key& k2) const |
| 1253 | { return k1.eq(k2); } |
| 1254 | }; |
| 1255 | |
| 1256 | private: |
| 1257 | // Stub type. |
| 1258 | const int type_; |
| 1259 | // If this is a local symbol, this is the index in the defining object. |
| 1260 | // Otherwise, it is invalid_index for a global symbol. |
| 1261 | unsigned int r_sym_; |
| 1262 | // If r_sym_ is an invalid index, this points to a global symbol. |
| 1263 | // Otherwise, it points to a relobj. We used the unsized and target |
| 1264 | // independent Symbol and Relobj classes instead of Sized_symbol<32> and |
| 1265 | // Arm_relobj, in order to avoid making the stub class a template |
| 1266 | // as most of the stub machinery is endianness-neutral. However, it |
| 1267 | // may require a bit of casting done by users of this class. |
| 1268 | union |
| 1269 | { |
| 1270 | const Symbol* symbol; |
| 1271 | const Relobj* relobj; |
| 1272 | } u_; |
| 1273 | // Addend associated with a reloc. |
| 1274 | int32_t addend_; |
| 1275 | }; // End of inner class Reloc_stub::Key |
| 1276 | |
| 1277 | protected: |
| 1278 | // This may be overridden in the child class. |
| 1279 | virtual void |
| 1280 | do_write(unsigned char*, section_size_type); |
| 1281 | |
| 1282 | private: |
| 1283 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); |
| 1284 | }; // End of Reloc_stub |
| 1285 | |
| 1286 | template<int size, bool big_endian> |
| 1287 | const int Reloc_stub<size, big_endian>::STUB_ADDR_ALIGN = 4; |
| 1288 | |
| 1289 | // Write data to output file. |
| 1290 | |
| 1291 | template<int size, bool big_endian> |
| 1292 | void |
| 1293 | Reloc_stub<size, big_endian>:: |
| 1294 | do_write(unsigned char* view, section_size_type) |
| 1295 | { |
| 1296 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 1297 | const uint32_t* insns = this->insns(); |
| 1298 | uint32_t num_insns = this->insn_num(); |
| 1299 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 1300 | for (uint32_t i = 0; i < num_insns; ++i) |
| 1301 | elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]); |
| 1302 | } |
| 1303 | |
| 1304 | |
| 1305 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is |
| 1306 | // needed. |
| 1307 | |
| 1308 | template<int size, bool big_endian> |
| 1309 | inline int |
| 1310 | Reloc_stub<size, big_endian>::stub_type_for_reloc( |
| 1311 | unsigned int r_type, AArch64_address location, AArch64_address dest) |
| 1312 | { |
| 1313 | int64_t branch_offset = 0; |
| 1314 | switch(r_type) |
| 1315 | { |
| 1316 | case elfcpp::R_AARCH64_CALL26: |
| 1317 | case elfcpp::R_AARCH64_JUMP26: |
| 1318 | branch_offset = dest - location; |
| 1319 | break; |
| 1320 | default: |
| 1321 | gold_unreachable(); |
| 1322 | } |
| 1323 | |
| 1324 | if (aarch64_valid_branch_offset_p(branch_offset)) |
| 1325 | return ST_NONE; |
| 1326 | |
| 1327 | if (aarch64_valid_for_adrp_p(location, dest)) |
| 1328 | return ST_ADRP_BRANCH; |
| 1329 | |
| 1330 | if (parameters->options().output_is_position_independent() |
| 1331 | && parameters->options().output_is_executable()) |
| 1332 | return ST_LONG_BRANCH_PCREL; |
| 1333 | |
| 1334 | return ST_LONG_BRANCH_ABS; |
| 1335 | } |
| 1336 | |
| 1337 | // A class to hold stubs for the ARM target. |
| 1338 | |
| 1339 | template<int size, bool big_endian> |
| 1340 | class Stub_table : public Output_data |
| 1341 | { |
| 1342 | public: |
| 1343 | typedef Target_aarch64<size, big_endian> The_target_aarch64; |
| 1344 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 1345 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 1346 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 1347 | typedef Reloc_stub<size, big_endian> The_reloc_stub; |
| 1348 | typedef typename The_reloc_stub::Key The_reloc_stub_key; |
| 1349 | typedef Erratum_stub<size, big_endian> The_erratum_stub; |
| 1350 | typedef Erratum_stub_less<size, big_endian> The_erratum_stub_less; |
| 1351 | typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash; |
| 1352 | typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to; |
| 1353 | typedef Stub_table<size, big_endian> The_stub_table; |
| 1354 | typedef Unordered_map<The_reloc_stub_key, The_reloc_stub*, |
| 1355 | The_reloc_stub_key_hash, The_reloc_stub_key_equal_to> |
| 1356 | Reloc_stub_map; |
| 1357 | typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter; |
| 1358 | typedef Relocate_info<size, big_endian> The_relocate_info; |
| 1359 | |
| 1360 | typedef std::set<The_erratum_stub*, The_erratum_stub_less> Erratum_stub_set; |
| 1361 | typedef typename Erratum_stub_set::iterator Erratum_stub_set_iter; |
| 1362 | |
| 1363 | Stub_table(The_aarch64_input_section* owner) |
| 1364 | : Output_data(), owner_(owner), reloc_stubs_size_(0), |
| 1365 | erratum_stubs_size_(0), prev_data_size_(0) |
| 1366 | { } |
| 1367 | |
| 1368 | ~Stub_table() |
| 1369 | { } |
| 1370 | |
| 1371 | The_aarch64_input_section* |
| 1372 | owner() const |
| 1373 | { return owner_; } |
| 1374 | |
| 1375 | // Whether this stub table is empty. |
| 1376 | bool |
| 1377 | empty() const |
| 1378 | { return reloc_stubs_.empty() && erratum_stubs_.empty(); } |
| 1379 | |
| 1380 | // Return the current data size. |
| 1381 | off_t |
| 1382 | current_data_size() const |
| 1383 | { return this->current_data_size_for_child(); } |
| 1384 | |
| 1385 | // Add a STUB using KEY. The caller is responsible for avoiding addition |
| 1386 | // if a STUB with the same key has already been added. |
| 1387 | void |
| 1388 | add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key); |
| 1389 | |
| 1390 | // Add an erratum stub into the erratum stub set. The set is ordered by |
| 1391 | // (relobj, shndx, sh_offset). |
| 1392 | void |
| 1393 | add_erratum_stub(The_erratum_stub* stub); |
| 1394 | |
| 1395 | // Find if such erratum exists for any given (obj, shndx, sh_offset). |
| 1396 | The_erratum_stub* |
| 1397 | find_erratum_stub(The_aarch64_relobj* a64relobj, |
| 1398 | unsigned int shndx, unsigned int sh_offset); |
| 1399 | |
| 1400 | // Find all the erratums for a given input section. The return value is a pair |
| 1401 | // of iterators [begin, end). |
| 1402 | std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> |
| 1403 | find_erratum_stubs_for_input_section(The_aarch64_relobj* a64relobj, |
| 1404 | unsigned int shndx); |
| 1405 | |
| 1406 | // Compute the erratum stub address. |
| 1407 | AArch64_address |
| 1408 | erratum_stub_address(The_erratum_stub* stub) const |
| 1409 | { |
| 1410 | AArch64_address r = align_address(this->address() + this->reloc_stubs_size_, |
| 1411 | The_erratum_stub::STUB_ADDR_ALIGN); |
| 1412 | r += stub->offset(); |
| 1413 | return r; |
| 1414 | } |
| 1415 | |
| 1416 | // Finalize stubs. No-op here, just for completeness. |
| 1417 | void |
| 1418 | finalize_stubs() |
| 1419 | { } |
| 1420 | |
| 1421 | // Look up a relocation stub using KEY. Return NULL if there is none. |
| 1422 | The_reloc_stub* |
| 1423 | find_reloc_stub(The_reloc_stub_key& key) |
| 1424 | { |
| 1425 | Reloc_stub_map_const_iter p = this->reloc_stubs_.find(key); |
| 1426 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; |
| 1427 | } |
| 1428 | |
| 1429 | // Relocate stubs in this stub table. |
| 1430 | void |
| 1431 | relocate_stubs(const The_relocate_info*, |
| 1432 | The_target_aarch64*, |
| 1433 | Output_section*, |
| 1434 | unsigned char*, |
| 1435 | AArch64_address, |
| 1436 | section_size_type); |
| 1437 | |
| 1438 | // Update data size at the end of a relaxation pass. Return true if data size |
| 1439 | // is different from that of the previous relaxation pass. |
| 1440 | bool |
| 1441 | update_data_size_changed_p() |
| 1442 | { |
| 1443 | // No addralign changed here. |
| 1444 | off_t s = align_address(this->reloc_stubs_size_, |
| 1445 | The_erratum_stub::STUB_ADDR_ALIGN) |
| 1446 | + this->erratum_stubs_size_; |
| 1447 | bool changed = (s != this->prev_data_size_); |
| 1448 | this->prev_data_size_ = s; |
| 1449 | return changed; |
| 1450 | } |
| 1451 | |
| 1452 | protected: |
| 1453 | // Write out section contents. |
| 1454 | void |
| 1455 | do_write(Output_file*); |
| 1456 | |
| 1457 | // Return the required alignment. |
| 1458 | uint64_t |
| 1459 | do_addralign() const |
| 1460 | { |
| 1461 | return std::max(The_reloc_stub::STUB_ADDR_ALIGN, |
| 1462 | The_erratum_stub::STUB_ADDR_ALIGN); |
| 1463 | } |
| 1464 | |
| 1465 | // Reset address and file offset. |
| 1466 | void |
| 1467 | do_reset_address_and_file_offset() |
| 1468 | { this->set_current_data_size_for_child(this->prev_data_size_); } |
| 1469 | |
| 1470 | // Set final data size. |
| 1471 | void |
| 1472 | set_final_data_size() |
| 1473 | { this->set_data_size(this->current_data_size()); } |
| 1474 | |
| 1475 | private: |
| 1476 | // Relocate one stub. |
| 1477 | void |
| 1478 | relocate_stub(The_reloc_stub*, |
| 1479 | const The_relocate_info*, |
| 1480 | The_target_aarch64*, |
| 1481 | Output_section*, |
| 1482 | unsigned char*, |
| 1483 | AArch64_address, |
| 1484 | section_size_type); |
| 1485 | |
| 1486 | private: |
| 1487 | // Owner of this stub table. |
| 1488 | The_aarch64_input_section* owner_; |
| 1489 | // The relocation stubs. |
| 1490 | Reloc_stub_map reloc_stubs_; |
| 1491 | // The erratum stubs. |
| 1492 | Erratum_stub_set erratum_stubs_; |
| 1493 | // Size of reloc stubs. |
| 1494 | off_t reloc_stubs_size_; |
| 1495 | // Size of erratum stubs. |
| 1496 | off_t erratum_stubs_size_; |
| 1497 | // data size of this in the previous pass. |
| 1498 | off_t prev_data_size_; |
| 1499 | }; // End of Stub_table |
| 1500 | |
| 1501 | |
| 1502 | // Add an erratum stub into the erratum stub set. The set is ordered by |
| 1503 | // (relobj, shndx, sh_offset). |
| 1504 | |
| 1505 | template<int size, bool big_endian> |
| 1506 | void |
| 1507 | Stub_table<size, big_endian>::add_erratum_stub(The_erratum_stub* stub) |
| 1508 | { |
| 1509 | std::pair<Erratum_stub_set_iter, bool> ret = |
| 1510 | this->erratum_stubs_.insert(stub); |
| 1511 | gold_assert(ret.second); |
| 1512 | this->erratum_stubs_size_ = align_address( |
| 1513 | this->erratum_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN); |
| 1514 | stub->set_offset(this->erratum_stubs_size_); |
| 1515 | this->erratum_stubs_size_ += stub->stub_size(); |
| 1516 | } |
| 1517 | |
| 1518 | |
| 1519 | // Find if such erratum exists for given (obj, shndx, sh_offset). |
| 1520 | |
| 1521 | template<int size, bool big_endian> |
| 1522 | Erratum_stub<size, big_endian>* |
| 1523 | Stub_table<size, big_endian>::find_erratum_stub( |
| 1524 | The_aarch64_relobj* a64relobj, unsigned int shndx, unsigned int sh_offset) |
| 1525 | { |
| 1526 | // A dummy object used as key to search in the set. |
| 1527 | The_erratum_stub key(a64relobj, ST_NONE, |
| 1528 | shndx, sh_offset); |
| 1529 | Erratum_stub_set_iter i = this->erratum_stubs_.find(&key); |
| 1530 | if (i != this->erratum_stubs_.end()) |
| 1531 | { |
| 1532 | The_erratum_stub* stub(*i); |
| 1533 | gold_assert(stub->erratum_insn() != 0); |
| 1534 | return stub; |
| 1535 | } |
| 1536 | return NULL; |
| 1537 | } |
| 1538 | |
| 1539 | |
| 1540 | // Find all the errata for a given input section. The return value is a pair of |
| 1541 | // iterators [begin, end). |
| 1542 | |
| 1543 | template<int size, bool big_endian> |
| 1544 | std::pair<typename Stub_table<size, big_endian>::Erratum_stub_set_iter, |
| 1545 | typename Stub_table<size, big_endian>::Erratum_stub_set_iter> |
| 1546 | Stub_table<size, big_endian>::find_erratum_stubs_for_input_section( |
| 1547 | The_aarch64_relobj* a64relobj, unsigned int shndx) |
| 1548 | { |
| 1549 | typedef std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> Result_pair; |
| 1550 | Erratum_stub_set_iter start, end; |
| 1551 | The_erratum_stub low_key(a64relobj, ST_NONE, shndx, 0); |
| 1552 | start = this->erratum_stubs_.lower_bound(&low_key); |
| 1553 | if (start == this->erratum_stubs_.end()) |
| 1554 | return Result_pair(this->erratum_stubs_.end(), |
| 1555 | this->erratum_stubs_.end()); |
| 1556 | end = start; |
| 1557 | while (end != this->erratum_stubs_.end() && |
| 1558 | (*end)->relobj() == a64relobj && (*end)->shndx() == shndx) |
| 1559 | ++end; |
| 1560 | return Result_pair(start, end); |
| 1561 | } |
| 1562 | |
| 1563 | |
| 1564 | // Add a STUB using KEY. The caller is responsible for avoiding addition |
| 1565 | // if a STUB with the same key has already been added. |
| 1566 | |
| 1567 | template<int size, bool big_endian> |
| 1568 | void |
| 1569 | Stub_table<size, big_endian>::add_reloc_stub( |
| 1570 | The_reloc_stub* stub, const The_reloc_stub_key& key) |
| 1571 | { |
| 1572 | gold_assert(stub->type() == key.type()); |
| 1573 | this->reloc_stubs_[key] = stub; |
| 1574 | |
| 1575 | // Assign stub offset early. We can do this because we never remove |
| 1576 | // reloc stubs and they are in the beginning of the stub table. |
| 1577 | this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_, |
| 1578 | The_reloc_stub::STUB_ADDR_ALIGN); |
| 1579 | stub->set_offset(this->reloc_stubs_size_); |
| 1580 | this->reloc_stubs_size_ += stub->stub_size(); |
| 1581 | } |
| 1582 | |
| 1583 | |
| 1584 | // Relocate all stubs in this stub table. |
| 1585 | |
| 1586 | template<int size, bool big_endian> |
| 1587 | void |
| 1588 | Stub_table<size, big_endian>:: |
| 1589 | relocate_stubs(const The_relocate_info* relinfo, |
| 1590 | The_target_aarch64* target_aarch64, |
| 1591 | Output_section* output_section, |
| 1592 | unsigned char* view, |
| 1593 | AArch64_address address, |
| 1594 | section_size_type view_size) |
| 1595 | { |
| 1596 | // "view_size" is the total size of the stub_table. |
| 1597 | gold_assert(address == this->address() && |
| 1598 | view_size == static_cast<section_size_type>(this->data_size())); |
| 1599 | for(Reloc_stub_map_const_iter p = this->reloc_stubs_.begin(); |
| 1600 | p != this->reloc_stubs_.end(); ++p) |
| 1601 | relocate_stub(p->second, relinfo, target_aarch64, output_section, |
| 1602 | view, address, view_size); |
| 1603 | |
| 1604 | // Just for convenience. |
| 1605 | const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; |
| 1606 | |
| 1607 | // Now 'relocate' erratum stubs. |
| 1608 | for(Erratum_stub_set_iter i = this->erratum_stubs_.begin(); |
| 1609 | i != this->erratum_stubs_.end(); ++i) |
| 1610 | { |
| 1611 | AArch64_address stub_address = this->erratum_stub_address(*i); |
| 1612 | // The address of "b" in the stub that is to be "relocated". |
| 1613 | AArch64_address stub_b_insn_address; |
| 1614 | // Branch offset that is to be filled in "b" insn. |
| 1615 | int b_offset = 0; |
| 1616 | switch ((*i)->type()) |
| 1617 | { |
| 1618 | case ST_E_843419: |
| 1619 | case ST_E_835769: |
| 1620 | // The 1st insn of the erratum could be a relocation spot, |
| 1621 | // in this case we need to fix it with |
| 1622 | // "(*i)->erratum_insn()". |
| 1623 | elfcpp::Swap<32, big_endian>::writeval( |
| 1624 | view + (stub_address - this->address()), |
| 1625 | (*i)->erratum_insn()); |
| 1626 | // For the erratum, the 2nd insn is a b-insn to be patched |
| 1627 | // (relocated). |
| 1628 | stub_b_insn_address = stub_address + 1 * BPI; |
| 1629 | b_offset = (*i)->destination_address() - stub_b_insn_address; |
| 1630 | AArch64_relocate_functions<size, big_endian>::construct_b( |
| 1631 | view + (stub_b_insn_address - this->address()), |
| 1632 | ((unsigned int)(b_offset)) & 0xfffffff); |
| 1633 | break; |
| 1634 | default: |
| 1635 | gold_unreachable(); |
| 1636 | break; |
| 1637 | } |
| 1638 | } |
| 1639 | } |
| 1640 | |
| 1641 | |
| 1642 | // Relocate one stub. This is a helper for Stub_table::relocate_stubs(). |
| 1643 | |
| 1644 | template<int size, bool big_endian> |
| 1645 | void |
| 1646 | Stub_table<size, big_endian>:: |
| 1647 | relocate_stub(The_reloc_stub* stub, |
| 1648 | const The_relocate_info* relinfo, |
| 1649 | The_target_aarch64* target_aarch64, |
| 1650 | Output_section* output_section, |
| 1651 | unsigned char* view, |
| 1652 | AArch64_address address, |
| 1653 | section_size_type view_size) |
| 1654 | { |
| 1655 | // "offset" is the offset from the beginning of the stub_table. |
| 1656 | section_size_type offset = stub->offset(); |
| 1657 | section_size_type stub_size = stub->stub_size(); |
| 1658 | // "view_size" is the total size of the stub_table. |
| 1659 | gold_assert(offset + stub_size <= view_size); |
| 1660 | |
| 1661 | target_aarch64->relocate_stub(stub, relinfo, output_section, |
| 1662 | view + offset, address + offset, view_size); |
| 1663 | } |
| 1664 | |
| 1665 | |
| 1666 | // Write out the stubs to file. |
| 1667 | |
| 1668 | template<int size, bool big_endian> |
| 1669 | void |
| 1670 | Stub_table<size, big_endian>::do_write(Output_file* of) |
| 1671 | { |
| 1672 | off_t offset = this->offset(); |
| 1673 | const section_size_type oview_size = |
| 1674 | convert_to_section_size_type(this->data_size()); |
| 1675 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 1676 | |
| 1677 | // Write relocation stubs. |
| 1678 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); |
| 1679 | p != this->reloc_stubs_.end(); ++p) |
| 1680 | { |
| 1681 | The_reloc_stub* stub = p->second; |
| 1682 | AArch64_address address = this->address() + stub->offset(); |
| 1683 | gold_assert(address == |
| 1684 | align_address(address, The_reloc_stub::STUB_ADDR_ALIGN)); |
| 1685 | stub->write(oview + stub->offset(), stub->stub_size()); |
| 1686 | } |
| 1687 | |
| 1688 | // Write erratum stubs. |
| 1689 | unsigned int erratum_stub_start_offset = |
| 1690 | align_address(this->reloc_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN); |
| 1691 | for (typename Erratum_stub_set::iterator p = this->erratum_stubs_.begin(); |
| 1692 | p != this->erratum_stubs_.end(); ++p) |
| 1693 | { |
| 1694 | The_erratum_stub* stub(*p); |
| 1695 | stub->write(oview + erratum_stub_start_offset + stub->offset(), |
| 1696 | stub->stub_size()); |
| 1697 | } |
| 1698 | |
| 1699 | of->write_output_view(this->offset(), oview_size, oview); |
| 1700 | } |
| 1701 | |
| 1702 | |
| 1703 | // AArch64_relobj class. |
| 1704 | |
| 1705 | template<int size, bool big_endian> |
| 1706 | class AArch64_relobj : public Sized_relobj_file<size, big_endian> |
| 1707 | { |
| 1708 | public: |
| 1709 | typedef AArch64_relobj<size, big_endian> This; |
| 1710 | typedef Target_aarch64<size, big_endian> The_target_aarch64; |
| 1711 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 1712 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 1713 | typedef Stub_table<size, big_endian> The_stub_table; |
| 1714 | typedef Erratum_stub<size, big_endian> The_erratum_stub; |
| 1715 | typedef typename The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter; |
| 1716 | typedef std::vector<The_stub_table*> Stub_table_list; |
| 1717 | static const AArch64_address invalid_address = |
| 1718 | static_cast<AArch64_address>(-1); |
| 1719 | |
| 1720 | AArch64_relobj(const std::string& name, Input_file* input_file, off_t offset, |
| 1721 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) |
| 1722 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), |
| 1723 | stub_tables_() |
| 1724 | { } |
| 1725 | |
| 1726 | ~AArch64_relobj() |
| 1727 | { } |
| 1728 | |
| 1729 | // Return the stub table of the SHNDX-th section if there is one. |
| 1730 | The_stub_table* |
| 1731 | stub_table(unsigned int shndx) const |
| 1732 | { |
| 1733 | gold_assert(shndx < this->stub_tables_.size()); |
| 1734 | return this->stub_tables_[shndx]; |
| 1735 | } |
| 1736 | |
| 1737 | // Set STUB_TABLE to be the stub_table of the SHNDX-th section. |
| 1738 | void |
| 1739 | set_stub_table(unsigned int shndx, The_stub_table* stub_table) |
| 1740 | { |
| 1741 | gold_assert(shndx < this->stub_tables_.size()); |
| 1742 | this->stub_tables_[shndx] = stub_table; |
| 1743 | } |
| 1744 | |
| 1745 | // Entrance to errata scanning. |
| 1746 | void |
| 1747 | scan_errata(unsigned int shndx, |
| 1748 | const elfcpp::Shdr<size, big_endian>&, |
| 1749 | Output_section*, const Symbol_table*, |
| 1750 | The_target_aarch64*); |
| 1751 | |
| 1752 | // Scan all relocation sections for stub generation. |
| 1753 | void |
| 1754 | scan_sections_for_stubs(The_target_aarch64*, const Symbol_table*, |
| 1755 | const Layout*); |
| 1756 | |
| 1757 | // Whether a section is a scannable text section. |
| 1758 | bool |
| 1759 | text_section_is_scannable(const elfcpp::Shdr<size, big_endian>&, unsigned int, |
| 1760 | const Output_section*, const Symbol_table*); |
| 1761 | |
| 1762 | // Convert regular input section with index SHNDX to a relaxed section. |
| 1763 | void |
| 1764 | convert_input_section_to_relaxed_section(unsigned /* shndx */) |
| 1765 | { |
| 1766 | // The stubs have relocations and we need to process them after writing |
| 1767 | // out the stubs. So relocation now must follow section write. |
| 1768 | this->set_relocs_must_follow_section_writes(); |
| 1769 | } |
| 1770 | |
| 1771 | // Structure for mapping symbol position. |
| 1772 | struct Mapping_symbol_position |
| 1773 | { |
| 1774 | Mapping_symbol_position(unsigned int shndx, AArch64_address offset): |
| 1775 | shndx_(shndx), offset_(offset) |
| 1776 | {} |
| 1777 | |
| 1778 | // "<" comparator used in ordered_map container. |
| 1779 | bool |
| 1780 | operator<(const Mapping_symbol_position& p) const |
| 1781 | { |
| 1782 | return (this->shndx_ < p.shndx_ |
| 1783 | || (this->shndx_ == p.shndx_ && this->offset_ < p.offset_)); |
| 1784 | } |
| 1785 | |
| 1786 | // Section index. |
| 1787 | unsigned int shndx_; |
| 1788 | |
| 1789 | // Section offset. |
| 1790 | AArch64_address offset_; |
| 1791 | }; |
| 1792 | |
| 1793 | typedef std::map<Mapping_symbol_position, char> Mapping_symbol_info; |
| 1794 | |
| 1795 | protected: |
| 1796 | // Post constructor setup. |
| 1797 | void |
| 1798 | do_setup() |
| 1799 | { |
| 1800 | // Call parent's setup method. |
| 1801 | Sized_relobj_file<size, big_endian>::do_setup(); |
| 1802 | |
| 1803 | // Initialize look-up tables. |
| 1804 | this->stub_tables_.resize(this->shnum()); |
| 1805 | } |
| 1806 | |
| 1807 | virtual void |
| 1808 | do_relocate_sections( |
| 1809 | const Symbol_table* symtab, const Layout* layout, |
| 1810 | const unsigned char* pshdrs, Output_file* of, |
| 1811 | typename Sized_relobj_file<size, big_endian>::Views* pviews); |
| 1812 | |
| 1813 | // Count local symbols and (optionally) record mapping info. |
| 1814 | virtual void |
| 1815 | do_count_local_symbols(Stringpool_template<char>*, |
| 1816 | Stringpool_template<char>*); |
| 1817 | |
| 1818 | private: |
| 1819 | // Fix all errata in the object. |
| 1820 | void |
| 1821 | fix_errata(typename Sized_relobj_file<size, big_endian>::Views* pviews); |
| 1822 | |
| 1823 | // Try to fix erratum 843419 in an optimized way. Return true if patch is |
| 1824 | // applied. |
| 1825 | bool |
| 1826 | try_fix_erratum_843419_optimized( |
| 1827 | The_erratum_stub*, |
| 1828 | typename Sized_relobj_file<size, big_endian>::View_size&); |
| 1829 | |
| 1830 | // Whether a section needs to be scanned for relocation stubs. |
| 1831 | bool |
| 1832 | section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&, |
| 1833 | const Relobj::Output_sections&, |
| 1834 | const Symbol_table*, const unsigned char*); |
| 1835 | |
| 1836 | // List of stub tables. |
| 1837 | Stub_table_list stub_tables_; |
| 1838 | |
| 1839 | // Mapping symbol information sorted by (section index, section_offset). |
| 1840 | Mapping_symbol_info mapping_symbol_info_; |
| 1841 | }; // End of AArch64_relobj |
| 1842 | |
| 1843 | |
| 1844 | // Override to record mapping symbol information. |
| 1845 | template<int size, bool big_endian> |
| 1846 | void |
| 1847 | AArch64_relobj<size, big_endian>::do_count_local_symbols( |
| 1848 | Stringpool_template<char>* pool, Stringpool_template<char>* dynpool) |
| 1849 | { |
| 1850 | Sized_relobj_file<size, big_endian>::do_count_local_symbols(pool, dynpool); |
| 1851 | |
| 1852 | // Only erratum-fixing work needs mapping symbols, so skip this time consuming |
| 1853 | // processing if not fixing erratum. |
| 1854 | if (!parameters->options().fix_cortex_a53_843419() |
| 1855 | && !parameters->options().fix_cortex_a53_835769()) |
| 1856 | return; |
| 1857 | |
| 1858 | const unsigned int loccount = this->local_symbol_count(); |
| 1859 | if (loccount == 0) |
| 1860 | return; |
| 1861 | |
| 1862 | // Read the symbol table section header. |
| 1863 | const unsigned int symtab_shndx = this->symtab_shndx(); |
| 1864 | elfcpp::Shdr<size, big_endian> |
| 1865 | symtabshdr(this, this->elf_file()->section_header(symtab_shndx)); |
| 1866 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| 1867 | |
| 1868 | // Read the local symbols. |
| 1869 | const int sym_size =elfcpp::Elf_sizes<size>::sym_size; |
| 1870 | gold_assert(loccount == symtabshdr.get_sh_info()); |
| 1871 | off_t locsize = loccount * sym_size; |
| 1872 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| 1873 | locsize, true, true); |
| 1874 | |
| 1875 | // For mapping symbol processing, we need to read the symbol names. |
| 1876 | unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link()); |
| 1877 | if (strtab_shndx >= this->shnum()) |
| 1878 | { |
| 1879 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); |
| 1880 | return; |
| 1881 | } |
| 1882 | |
| 1883 | elfcpp::Shdr<size, big_endian> |
| 1884 | strtabshdr(this, this->elf_file()->section_header(strtab_shndx)); |
| 1885 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
| 1886 | { |
| 1887 | this->error(_("symbol table name section has wrong type: %u"), |
| 1888 | static_cast<unsigned int>(strtabshdr.get_sh_type())); |
| 1889 | return; |
| 1890 | } |
| 1891 | |
| 1892 | const char* pnames = |
| 1893 | reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(), |
| 1894 | strtabshdr.get_sh_size(), |
| 1895 | false, false)); |
| 1896 | |
| 1897 | // Skip the first dummy symbol. |
| 1898 | psyms += sym_size; |
| 1899 | typename Sized_relobj_file<size, big_endian>::Local_values* |
| 1900 | plocal_values = this->local_values(); |
| 1901 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| 1902 | { |
| 1903 | elfcpp::Sym<size, big_endian> sym(psyms); |
| 1904 | Symbol_value<size>& lv((*plocal_values)[i]); |
| 1905 | AArch64_address input_value = lv.input_value(); |
| 1906 | |
| 1907 | // Check to see if this is a mapping symbol. AArch64 mapping symbols are |
| 1908 | // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping |
| 1909 | // symbols. |
| 1910 | // Mapping symbols could be one of the following 4 forms - |
| 1911 | // a) $x |
| 1912 | // b) $x.<any...> |
| 1913 | // c) $d |
| 1914 | // d) $d.<any...> |
| 1915 | const char* sym_name = pnames + sym.get_st_name(); |
| 1916 | if (sym_name[0] == '$' && (sym_name[1] == 'x' || sym_name[1] == 'd') |
| 1917 | && (sym_name[2] == '\0' || sym_name[2] == '.')) |
| 1918 | { |
| 1919 | bool is_ordinary; |
| 1920 | unsigned int input_shndx = |
| 1921 | this->adjust_sym_shndx(i, sym.get_st_shndx(), &is_ordinary); |
| 1922 | gold_assert(is_ordinary); |
| 1923 | |
| 1924 | Mapping_symbol_position msp(input_shndx, input_value); |
| 1925 | // Insert mapping_symbol_info into map whose ordering is defined by |
| 1926 | // (shndx, offset_within_section). |
| 1927 | this->mapping_symbol_info_[msp] = sym_name[1]; |
| 1928 | } |
| 1929 | } |
| 1930 | } |
| 1931 | |
| 1932 | |
| 1933 | // Fix all errata in the object. |
| 1934 | |
| 1935 | template<int size, bool big_endian> |
| 1936 | void |
| 1937 | AArch64_relobj<size, big_endian>::fix_errata( |
| 1938 | typename Sized_relobj_file<size, big_endian>::Views* pviews) |
| 1939 | { |
| 1940 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; |
| 1941 | unsigned int shnum = this->shnum(); |
| 1942 | for (unsigned int i = 1; i < shnum; ++i) |
| 1943 | { |
| 1944 | The_stub_table* stub_table = this->stub_table(i); |
| 1945 | if (!stub_table) |
| 1946 | continue; |
| 1947 | std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> |
| 1948 | ipair(stub_table->find_erratum_stubs_for_input_section(this, i)); |
| 1949 | Erratum_stub_set_iter p = ipair.first, end = ipair.second; |
| 1950 | while (p != end) |
| 1951 | { |
| 1952 | The_erratum_stub* stub = *p; |
| 1953 | typename Sized_relobj_file<size, big_endian>::View_size& |
| 1954 | pview((*pviews)[i]); |
| 1955 | |
| 1956 | // Double check data before fix. |
| 1957 | gold_assert(pview.address + stub->sh_offset() |
| 1958 | == stub->erratum_address()); |
| 1959 | |
| 1960 | // Update previously recorded erratum insn with relocated |
| 1961 | // version. |
| 1962 | Insntype* ip = |
| 1963 | reinterpret_cast<Insntype*>(pview.view + stub->sh_offset()); |
| 1964 | Insntype insn_to_fix = ip[0]; |
| 1965 | stub->update_erratum_insn(insn_to_fix); |
| 1966 | |
| 1967 | // First try to see if erratum is 843419 and if it can be fixed |
| 1968 | // without using branch-to-stub. |
| 1969 | if (!try_fix_erratum_843419_optimized(stub, pview)) |
| 1970 | { |
| 1971 | // Replace the erratum insn with a branch-to-stub. |
| 1972 | AArch64_address stub_address = |
| 1973 | stub_table->erratum_stub_address(stub); |
| 1974 | unsigned int b_offset = stub_address - stub->erratum_address(); |
| 1975 | AArch64_relocate_functions<size, big_endian>::construct_b( |
| 1976 | pview.view + stub->sh_offset(), b_offset & 0xfffffff); |
| 1977 | } |
| 1978 | ++p; |
| 1979 | } |
| 1980 | } |
| 1981 | } |
| 1982 | |
| 1983 | |
| 1984 | // This is an optimization for 843419. This erratum requires the sequence begin |
| 1985 | // with 'adrp', when final value calculated by adrp fits in adr, we can just |
| 1986 | // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however, |
| 1987 | // in this case, we do not delete the erratum stub (too late to do so), it is |
| 1988 | // merely generated without ever being called.) |
| 1989 | |
| 1990 | template<int size, bool big_endian> |
| 1991 | bool |
| 1992 | AArch64_relobj<size, big_endian>::try_fix_erratum_843419_optimized( |
| 1993 | The_erratum_stub* stub, |
| 1994 | typename Sized_relobj_file<size, big_endian>::View_size& pview) |
| 1995 | { |
| 1996 | if (stub->type() != ST_E_843419) |
| 1997 | return false; |
| 1998 | |
| 1999 | typedef AArch64_insn_utilities<big_endian> Insn_utilities; |
| 2000 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; |
| 2001 | E843419_stub<size, big_endian>* e843419_stub = |
| 2002 | reinterpret_cast<E843419_stub<size, big_endian>*>(stub); |
| 2003 | AArch64_address pc = pview.address + e843419_stub->adrp_sh_offset(); |
| 2004 | Insntype* adrp_view = reinterpret_cast<Insntype*>( |
| 2005 | pview.view + e843419_stub->adrp_sh_offset()); |
| 2006 | Insntype adrp_insn = adrp_view[0]; |
| 2007 | gold_assert(Insn_utilities::is_adrp(adrp_insn)); |
| 2008 | // Get adrp 33-bit signed imm value. |
| 2009 | int64_t adrp_imm = Insn_utilities:: |
| 2010 | aarch64_adrp_decode_imm(adrp_insn); |
| 2011 | // adrp - final value transferred to target register is calculated as: |
| 2012 | // PC[11:0] = Zeros(12) |
| 2013 | // adrp_dest_value = PC + adrp_imm; |
| 2014 | int64_t adrp_dest_value = (pc & ~((1 << 12) - 1)) + adrp_imm; |
| 2015 | // adr -final value transferred to target register is calucalted as: |
| 2016 | // PC + adr_imm |
| 2017 | // So we have: |
| 2018 | // PC + adr_imm = adrp_dest_value |
| 2019 | // ==> |
| 2020 | // adr_imm = adrp_dest_value - PC |
| 2021 | int64_t adr_imm = adrp_dest_value - pc; |
| 2022 | // Check if imm fits in adr (21-bit signed). |
| 2023 | if (-(1 << 20) <= adr_imm && adr_imm < (1 << 20)) |
| 2024 | { |
| 2025 | // Convert 'adrp' into 'adr'. |
| 2026 | Insntype adr_insn = adrp_insn & ((1u << 31) - 1); |
| 2027 | adr_insn = Insn_utilities:: |
| 2028 | aarch64_adr_encode_imm(adr_insn, adr_imm); |
| 2029 | elfcpp::Swap<32, big_endian>::writeval(adrp_view, adr_insn); |
| 2030 | return true; |
| 2031 | } |
| 2032 | return false; |
| 2033 | } |
| 2034 | |
| 2035 | |
| 2036 | // Relocate sections. |
| 2037 | |
| 2038 | template<int size, bool big_endian> |
| 2039 | void |
| 2040 | AArch64_relobj<size, big_endian>::do_relocate_sections( |
| 2041 | const Symbol_table* symtab, const Layout* layout, |
| 2042 | const unsigned char* pshdrs, Output_file* of, |
| 2043 | typename Sized_relobj_file<size, big_endian>::Views* pviews) |
| 2044 | { |
| 2045 | // Call parent to relocate sections. |
| 2046 | Sized_relobj_file<size, big_endian>::do_relocate_sections(symtab, layout, |
| 2047 | pshdrs, of, pviews); |
| 2048 | |
| 2049 | // We do not generate stubs if doing a relocatable link. |
| 2050 | if (parameters->options().relocatable()) |
| 2051 | return; |
| 2052 | |
| 2053 | if (parameters->options().fix_cortex_a53_843419() |
| 2054 | || parameters->options().fix_cortex_a53_835769()) |
| 2055 | this->fix_errata(pviews); |
| 2056 | |
| 2057 | Relocate_info<size, big_endian> relinfo; |
| 2058 | relinfo.symtab = symtab; |
| 2059 | relinfo.layout = layout; |
| 2060 | relinfo.object = this; |
| 2061 | |
| 2062 | // Relocate stub tables. |
| 2063 | unsigned int shnum = this->shnum(); |
| 2064 | The_target_aarch64* target = The_target_aarch64::current_target(); |
| 2065 | |
| 2066 | for (unsigned int i = 1; i < shnum; ++i) |
| 2067 | { |
| 2068 | The_aarch64_input_section* aarch64_input_section = |
| 2069 | target->find_aarch64_input_section(this, i); |
| 2070 | if (aarch64_input_section != NULL |
| 2071 | && aarch64_input_section->is_stub_table_owner() |
| 2072 | && !aarch64_input_section->stub_table()->empty()) |
| 2073 | { |
| 2074 | Output_section* os = this->output_section(i); |
| 2075 | gold_assert(os != NULL); |
| 2076 | |
| 2077 | relinfo.reloc_shndx = elfcpp::SHN_UNDEF; |
| 2078 | relinfo.reloc_shdr = NULL; |
| 2079 | relinfo.data_shndx = i; |
| 2080 | relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<size>::shdr_size; |
| 2081 | |
| 2082 | typename Sized_relobj_file<size, big_endian>::View_size& |
| 2083 | view_struct = (*pviews)[i]; |
| 2084 | gold_assert(view_struct.view != NULL); |
| 2085 | |
| 2086 | The_stub_table* stub_table = aarch64_input_section->stub_table(); |
| 2087 | off_t offset = stub_table->address() - view_struct.address; |
| 2088 | unsigned char* view = view_struct.view + offset; |
| 2089 | AArch64_address address = stub_table->address(); |
| 2090 | section_size_type view_size = stub_table->data_size(); |
| 2091 | stub_table->relocate_stubs(&relinfo, target, os, view, address, |
| 2092 | view_size); |
| 2093 | } |
| 2094 | } |
| 2095 | } |
| 2096 | |
| 2097 | |
| 2098 | // Determine if an input section is scannable for stub processing. SHDR is |
| 2099 | // the header of the section and SHNDX is the section index. OS is the output |
| 2100 | // section for the input section and SYMTAB is the global symbol table used to |
| 2101 | // look up ICF information. |
| 2102 | |
| 2103 | template<int size, bool big_endian> |
| 2104 | bool |
| 2105 | AArch64_relobj<size, big_endian>::text_section_is_scannable( |
| 2106 | const elfcpp::Shdr<size, big_endian>& text_shdr, |
| 2107 | unsigned int text_shndx, |
| 2108 | const Output_section* os, |
| 2109 | const Symbol_table* symtab) |
| 2110 | { |
| 2111 | // Skip any empty sections, unallocated sections or sections whose |
| 2112 | // type are not SHT_PROGBITS. |
| 2113 | if (text_shdr.get_sh_size() == 0 |
| 2114 | || (text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0 |
| 2115 | || text_shdr.get_sh_type() != elfcpp::SHT_PROGBITS) |
| 2116 | return false; |
| 2117 | |
| 2118 | // Skip any discarded or ICF'ed sections. |
| 2119 | if (os == NULL || symtab->is_section_folded(this, text_shndx)) |
| 2120 | return false; |
| 2121 | |
| 2122 | // Skip exception frame. |
| 2123 | if (strcmp(os->name(), ".eh_frame") == 0) |
| 2124 | return false ; |
| 2125 | |
| 2126 | gold_assert(!this->is_output_section_offset_invalid(text_shndx) || |
| 2127 | os->find_relaxed_input_section(this, text_shndx) != NULL); |
| 2128 | |
| 2129 | return true; |
| 2130 | } |
| 2131 | |
| 2132 | |
| 2133 | // Determine if we want to scan the SHNDX-th section for relocation stubs. |
| 2134 | // This is a helper for AArch64_relobj::scan_sections_for_stubs(). |
| 2135 | |
| 2136 | template<int size, bool big_endian> |
| 2137 | bool |
| 2138 | AArch64_relobj<size, big_endian>::section_needs_reloc_stub_scanning( |
| 2139 | const elfcpp::Shdr<size, big_endian>& shdr, |
| 2140 | const Relobj::Output_sections& out_sections, |
| 2141 | const Symbol_table* symtab, |
| 2142 | const unsigned char* pshdrs) |
| 2143 | { |
| 2144 | unsigned int sh_type = shdr.get_sh_type(); |
| 2145 | if (sh_type != elfcpp::SHT_RELA) |
| 2146 | return false; |
| 2147 | |
| 2148 | // Ignore empty section. |
| 2149 | off_t sh_size = shdr.get_sh_size(); |
| 2150 | if (sh_size == 0) |
| 2151 | return false; |
| 2152 | |
| 2153 | // Ignore reloc section with unexpected symbol table. The |
| 2154 | // error will be reported in the final link. |
| 2155 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx()) |
| 2156 | return false; |
| 2157 | |
| 2158 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 2159 | unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 2160 | |
| 2161 | // Ignore reloc section with unexpected entsize or uneven size. |
| 2162 | // The error will be reported in the final link. |
| 2163 | if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0) |
| 2164 | return false; |
| 2165 | |
| 2166 | // Ignore reloc section with bad info. This error will be |
| 2167 | // reported in the final link. |
| 2168 | unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_info()); |
| 2169 | if (text_shndx >= this->shnum()) |
| 2170 | return false; |
| 2171 | |
| 2172 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 2173 | const elfcpp::Shdr<size, big_endian> text_shdr(pshdrs + |
| 2174 | text_shndx * shdr_size); |
| 2175 | return this->text_section_is_scannable(text_shdr, text_shndx, |
| 2176 | out_sections[text_shndx], symtab); |
| 2177 | } |
| 2178 | |
| 2179 | |
| 2180 | // Scan section SHNDX for erratum 843419 and 835769. |
| 2181 | |
| 2182 | template<int size, bool big_endian> |
| 2183 | void |
| 2184 | AArch64_relobj<size, big_endian>::scan_errata( |
| 2185 | unsigned int shndx, const elfcpp::Shdr<size, big_endian>& shdr, |
| 2186 | Output_section* os, const Symbol_table* symtab, |
| 2187 | The_target_aarch64* target) |
| 2188 | { |
| 2189 | if (shdr.get_sh_size() == 0 |
| 2190 | || (shdr.get_sh_flags() & |
| 2191 | (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) == 0 |
| 2192 | || shdr.get_sh_type() != elfcpp::SHT_PROGBITS) |
| 2193 | return; |
| 2194 | |
| 2195 | if (!os || symtab->is_section_folded(this, shndx)) return; |
| 2196 | |
| 2197 | AArch64_address output_offset = this->get_output_section_offset(shndx); |
| 2198 | AArch64_address output_address; |
| 2199 | if (output_offset != invalid_address) |
| 2200 | output_address = os->address() + output_offset; |
| 2201 | else |
| 2202 | { |
| 2203 | const Output_relaxed_input_section* poris = |
| 2204 | os->find_relaxed_input_section(this, shndx); |
| 2205 | if (!poris) return; |
| 2206 | output_address = poris->address(); |
| 2207 | } |
| 2208 | |
| 2209 | section_size_type input_view_size = 0; |
| 2210 | const unsigned char* input_view = |
| 2211 | this->section_contents(shndx, &input_view_size, false); |
| 2212 | |
| 2213 | Mapping_symbol_position section_start(shndx, 0); |
| 2214 | // Find the first mapping symbol record within section shndx. |
| 2215 | typename Mapping_symbol_info::const_iterator p = |
| 2216 | this->mapping_symbol_info_.lower_bound(section_start); |
| 2217 | while (p != this->mapping_symbol_info_.end() && |
| 2218 | p->first.shndx_ == shndx) |
| 2219 | { |
| 2220 | typename Mapping_symbol_info::const_iterator prev = p; |
| 2221 | ++p; |
| 2222 | if (prev->second == 'x') |
| 2223 | { |
| 2224 | section_size_type span_start = |
| 2225 | convert_to_section_size_type(prev->first.offset_); |
| 2226 | section_size_type span_end; |
| 2227 | if (p != this->mapping_symbol_info_.end() |
| 2228 | && p->first.shndx_ == shndx) |
| 2229 | span_end = convert_to_section_size_type(p->first.offset_); |
| 2230 | else |
| 2231 | span_end = convert_to_section_size_type(shdr.get_sh_size()); |
| 2232 | |
| 2233 | // Here we do not share the scanning code of both errata. For 843419, |
| 2234 | // only the last few insns of each page are examined, which is fast, |
| 2235 | // whereas, for 835769, every insn pair needs to be checked. |
| 2236 | |
| 2237 | if (parameters->options().fix_cortex_a53_843419()) |
| 2238 | target->scan_erratum_843419_span( |
| 2239 | this, shndx, span_start, span_end, |
| 2240 | const_cast<unsigned char*>(input_view), output_address); |
| 2241 | |
| 2242 | if (parameters->options().fix_cortex_a53_835769()) |
| 2243 | target->scan_erratum_835769_span( |
| 2244 | this, shndx, span_start, span_end, |
| 2245 | const_cast<unsigned char*>(input_view), output_address); |
| 2246 | } |
| 2247 | } |
| 2248 | } |
| 2249 | |
| 2250 | |
| 2251 | // Scan relocations for stub generation. |
| 2252 | |
| 2253 | template<int size, bool big_endian> |
| 2254 | void |
| 2255 | AArch64_relobj<size, big_endian>::scan_sections_for_stubs( |
| 2256 | The_target_aarch64* target, |
| 2257 | const Symbol_table* symtab, |
| 2258 | const Layout* layout) |
| 2259 | { |
| 2260 | unsigned int shnum = this->shnum(); |
| 2261 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| 2262 | |
| 2263 | // Read the section headers. |
| 2264 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), |
| 2265 | shnum * shdr_size, |
| 2266 | true, true); |
| 2267 | |
| 2268 | // To speed up processing, we set up hash tables for fast lookup of |
| 2269 | // input offsets to output addresses. |
| 2270 | this->initialize_input_to_output_maps(); |
| 2271 | |
| 2272 | const Relobj::Output_sections& out_sections(this->output_sections()); |
| 2273 | |
| 2274 | Relocate_info<size, big_endian> relinfo; |
| 2275 | relinfo.symtab = symtab; |
| 2276 | relinfo.layout = layout; |
| 2277 | relinfo.object = this; |
| 2278 | |
| 2279 | // Do relocation stubs scanning. |
| 2280 | const unsigned char* p = pshdrs + shdr_size; |
| 2281 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) |
| 2282 | { |
| 2283 | const elfcpp::Shdr<size, big_endian> shdr(p); |
| 2284 | if (parameters->options().fix_cortex_a53_843419() |
| 2285 | || parameters->options().fix_cortex_a53_835769()) |
| 2286 | scan_errata(i, shdr, out_sections[i], symtab, target); |
| 2287 | if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab, |
| 2288 | pshdrs)) |
| 2289 | { |
| 2290 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); |
| 2291 | AArch64_address output_offset = |
| 2292 | this->get_output_section_offset(index); |
| 2293 | AArch64_address output_address; |
| 2294 | if (output_offset != invalid_address) |
| 2295 | { |
| 2296 | output_address = out_sections[index]->address() + output_offset; |
| 2297 | } |
| 2298 | else |
| 2299 | { |
| 2300 | // Currently this only happens for a relaxed section. |
| 2301 | const Output_relaxed_input_section* poris = |
| 2302 | out_sections[index]->find_relaxed_input_section(this, index); |
| 2303 | gold_assert(poris != NULL); |
| 2304 | output_address = poris->address(); |
| 2305 | } |
| 2306 | |
| 2307 | // Get the relocations. |
| 2308 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), |
| 2309 | shdr.get_sh_size(), |
| 2310 | true, false); |
| 2311 | |
| 2312 | // Get the section contents. |
| 2313 | section_size_type input_view_size = 0; |
| 2314 | const unsigned char* input_view = |
| 2315 | this->section_contents(index, &input_view_size, false); |
| 2316 | |
| 2317 | relinfo.reloc_shndx = i; |
| 2318 | relinfo.data_shndx = index; |
| 2319 | unsigned int sh_type = shdr.get_sh_type(); |
| 2320 | unsigned int reloc_size; |
| 2321 | gold_assert (sh_type == elfcpp::SHT_RELA); |
| 2322 | reloc_size = elfcpp::Elf_sizes<size>::rela_size; |
| 2323 | |
| 2324 | Output_section* os = out_sections[index]; |
| 2325 | target->scan_section_for_stubs(&relinfo, sh_type, prelocs, |
| 2326 | shdr.get_sh_size() / reloc_size, |
| 2327 | os, |
| 2328 | output_offset == invalid_address, |
| 2329 | input_view, output_address, |
| 2330 | input_view_size); |
| 2331 | } |
| 2332 | } |
| 2333 | } |
| 2334 | |
| 2335 | |
| 2336 | // A class to wrap an ordinary input section containing executable code. |
| 2337 | |
| 2338 | template<int size, bool big_endian> |
| 2339 | class AArch64_input_section : public Output_relaxed_input_section |
| 2340 | { |
| 2341 | public: |
| 2342 | typedef Stub_table<size, big_endian> The_stub_table; |
| 2343 | |
| 2344 | AArch64_input_section(Relobj* relobj, unsigned int shndx) |
| 2345 | : Output_relaxed_input_section(relobj, shndx, 1), |
| 2346 | stub_table_(NULL), |
| 2347 | original_contents_(NULL), original_size_(0), |
| 2348 | original_addralign_(1) |
| 2349 | { } |
| 2350 | |
| 2351 | ~AArch64_input_section() |
| 2352 | { delete[] this->original_contents_; } |
| 2353 | |
| 2354 | // Initialize. |
| 2355 | void |
| 2356 | init(); |
| 2357 | |
| 2358 | // Set the stub_table. |
| 2359 | void |
| 2360 | set_stub_table(The_stub_table* st) |
| 2361 | { this->stub_table_ = st; } |
| 2362 | |
| 2363 | // Whether this is a stub table owner. |
| 2364 | bool |
| 2365 | is_stub_table_owner() const |
| 2366 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } |
| 2367 | |
| 2368 | // Return the original size of the section. |
| 2369 | uint32_t |
| 2370 | original_size() const |
| 2371 | { return this->original_size_; } |
| 2372 | |
| 2373 | // Return the stub table. |
| 2374 | The_stub_table* |
| 2375 | stub_table() |
| 2376 | { return stub_table_; } |
| 2377 | |
| 2378 | protected: |
| 2379 | // Write out this input section. |
| 2380 | void |
| 2381 | do_write(Output_file*); |
| 2382 | |
| 2383 | // Return required alignment of this. |
| 2384 | uint64_t |
| 2385 | do_addralign() const |
| 2386 | { |
| 2387 | if (this->is_stub_table_owner()) |
| 2388 | return std::max(this->stub_table_->addralign(), |
| 2389 | static_cast<uint64_t>(this->original_addralign_)); |
| 2390 | else |
| 2391 | return this->original_addralign_; |
| 2392 | } |
| 2393 | |
| 2394 | // Finalize data size. |
| 2395 | void |
| 2396 | set_final_data_size(); |
| 2397 | |
| 2398 | // Reset address and file offset. |
| 2399 | void |
| 2400 | do_reset_address_and_file_offset(); |
| 2401 | |
| 2402 | // Output offset. |
| 2403 | bool |
| 2404 | do_output_offset(const Relobj* object, unsigned int shndx, |
| 2405 | section_offset_type offset, |
| 2406 | section_offset_type* poutput) const |
| 2407 | { |
| 2408 | if ((object == this->relobj()) |
| 2409 | && (shndx == this->shndx()) |
| 2410 | && (offset >= 0) |
| 2411 | && (offset <= |
| 2412 | convert_types<section_offset_type, uint32_t>(this->original_size_))) |
| 2413 | { |
| 2414 | *poutput = offset; |
| 2415 | return true; |
| 2416 | } |
| 2417 | else |
| 2418 | return false; |
| 2419 | } |
| 2420 | |
| 2421 | private: |
| 2422 | // Copying is not allowed. |
| 2423 | AArch64_input_section(const AArch64_input_section&); |
| 2424 | AArch64_input_section& operator=(const AArch64_input_section&); |
| 2425 | |
| 2426 | // The relocation stubs. |
| 2427 | The_stub_table* stub_table_; |
| 2428 | // Original section contents. We have to make a copy here since the file |
| 2429 | // containing the original section may not be locked when we need to access |
| 2430 | // the contents. |
| 2431 | unsigned char* original_contents_; |
| 2432 | // Section size of the original input section. |
| 2433 | uint32_t original_size_; |
| 2434 | // Address alignment of the original input section. |
| 2435 | uint32_t original_addralign_; |
| 2436 | }; // End of AArch64_input_section |
| 2437 | |
| 2438 | |
| 2439 | // Finalize data size. |
| 2440 | |
| 2441 | template<int size, bool big_endian> |
| 2442 | void |
| 2443 | AArch64_input_section<size, big_endian>::set_final_data_size() |
| 2444 | { |
| 2445 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); |
| 2446 | |
| 2447 | if (this->is_stub_table_owner()) |
| 2448 | { |
| 2449 | this->stub_table_->finalize_data_size(); |
| 2450 | off = align_address(off, this->stub_table_->addralign()); |
| 2451 | off += this->stub_table_->data_size(); |
| 2452 | } |
| 2453 | this->set_data_size(off); |
| 2454 | } |
| 2455 | |
| 2456 | |
| 2457 | // Reset address and file offset. |
| 2458 | |
| 2459 | template<int size, bool big_endian> |
| 2460 | void |
| 2461 | AArch64_input_section<size, big_endian>::do_reset_address_and_file_offset() |
| 2462 | { |
| 2463 | // Size of the original input section contents. |
| 2464 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); |
| 2465 | |
| 2466 | // If this is a stub table owner, account for the stub table size. |
| 2467 | if (this->is_stub_table_owner()) |
| 2468 | { |
| 2469 | The_stub_table* stub_table = this->stub_table_; |
| 2470 | |
| 2471 | // Reset the stub table's address and file offset. The |
| 2472 | // current data size for child will be updated after that. |
| 2473 | stub_table_->reset_address_and_file_offset(); |
| 2474 | off = align_address(off, stub_table_->addralign()); |
| 2475 | off += stub_table->current_data_size(); |
| 2476 | } |
| 2477 | |
| 2478 | this->set_current_data_size(off); |
| 2479 | } |
| 2480 | |
| 2481 | |
| 2482 | // Initialize an Arm_input_section. |
| 2483 | |
| 2484 | template<int size, bool big_endian> |
| 2485 | void |
| 2486 | AArch64_input_section<size, big_endian>::init() |
| 2487 | { |
| 2488 | Relobj* relobj = this->relobj(); |
| 2489 | unsigned int shndx = this->shndx(); |
| 2490 | |
| 2491 | // We have to cache original size, alignment and contents to avoid locking |
| 2492 | // the original file. |
| 2493 | this->original_addralign_ = |
| 2494 | convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx)); |
| 2495 | |
| 2496 | // This is not efficient but we expect only a small number of relaxed |
| 2497 | // input sections for stubs. |
| 2498 | section_size_type section_size; |
| 2499 | const unsigned char* section_contents = |
| 2500 | relobj->section_contents(shndx, §ion_size, false); |
| 2501 | this->original_size_ = |
| 2502 | convert_types<uint32_t, uint64_t>(relobj->section_size(shndx)); |
| 2503 | |
| 2504 | gold_assert(this->original_contents_ == NULL); |
| 2505 | this->original_contents_ = new unsigned char[section_size]; |
| 2506 | memcpy(this->original_contents_, section_contents, section_size); |
| 2507 | |
| 2508 | // We want to make this look like the original input section after |
| 2509 | // output sections are finalized. |
| 2510 | Output_section* os = relobj->output_section(shndx); |
| 2511 | off_t offset = relobj->output_section_offset(shndx); |
| 2512 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); |
| 2513 | this->set_address(os->address() + offset); |
| 2514 | this->set_file_offset(os->offset() + offset); |
| 2515 | this->set_current_data_size(this->original_size_); |
| 2516 | this->finalize_data_size(); |
| 2517 | } |
| 2518 | |
| 2519 | |
| 2520 | // Write data to output file. |
| 2521 | |
| 2522 | template<int size, bool big_endian> |
| 2523 | void |
| 2524 | AArch64_input_section<size, big_endian>::do_write(Output_file* of) |
| 2525 | { |
| 2526 | // We have to write out the original section content. |
| 2527 | gold_assert(this->original_contents_ != NULL); |
| 2528 | of->write(this->offset(), this->original_contents_, |
| 2529 | this->original_size_); |
| 2530 | |
| 2531 | // If this owns a stub table and it is not empty, write it. |
| 2532 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) |
| 2533 | this->stub_table_->write(of); |
| 2534 | } |
| 2535 | |
| 2536 | |
| 2537 | // Arm output section class. This is defined mainly to add a number of stub |
| 2538 | // generation methods. |
| 2539 | |
| 2540 | template<int size, bool big_endian> |
| 2541 | class AArch64_output_section : public Output_section |
| 2542 | { |
| 2543 | public: |
| 2544 | typedef Target_aarch64<size, big_endian> The_target_aarch64; |
| 2545 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 2546 | typedef Stub_table<size, big_endian> The_stub_table; |
| 2547 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 2548 | |
| 2549 | public: |
| 2550 | AArch64_output_section(const char* name, elfcpp::Elf_Word type, |
| 2551 | elfcpp::Elf_Xword flags) |
| 2552 | : Output_section(name, type, flags) |
| 2553 | { } |
| 2554 | |
| 2555 | ~AArch64_output_section() {} |
| 2556 | |
| 2557 | // Group input sections for stub generation. |
| 2558 | void |
| 2559 | group_sections(section_size_type, bool, Target_aarch64<size, big_endian>*, |
| 2560 | const Task*); |
| 2561 | |
| 2562 | private: |
| 2563 | typedef Output_section::Input_section Input_section; |
| 2564 | typedef Output_section::Input_section_list Input_section_list; |
| 2565 | |
| 2566 | // Create a stub group. |
| 2567 | void |
| 2568 | create_stub_group(Input_section_list::const_iterator, |
| 2569 | Input_section_list::const_iterator, |
| 2570 | Input_section_list::const_iterator, |
| 2571 | The_target_aarch64*, |
| 2572 | std::vector<Output_relaxed_input_section*>&, |
| 2573 | const Task*); |
| 2574 | }; // End of AArch64_output_section |
| 2575 | |
| 2576 | |
| 2577 | // Create a stub group for input sections from FIRST to LAST. OWNER points to |
| 2578 | // the input section that will be the owner of the stub table. |
| 2579 | |
| 2580 | template<int size, bool big_endian> void |
| 2581 | AArch64_output_section<size, big_endian>::create_stub_group( |
| 2582 | Input_section_list::const_iterator first, |
| 2583 | Input_section_list::const_iterator last, |
| 2584 | Input_section_list::const_iterator owner, |
| 2585 | The_target_aarch64* target, |
| 2586 | std::vector<Output_relaxed_input_section*>& new_relaxed_sections, |
| 2587 | const Task* task) |
| 2588 | { |
| 2589 | // Currently we convert ordinary input sections into relaxed sections only |
| 2590 | // at this point. |
| 2591 | The_aarch64_input_section* input_section; |
| 2592 | if (owner->is_relaxed_input_section()) |
| 2593 | gold_unreachable(); |
| 2594 | else |
| 2595 | { |
| 2596 | gold_assert(owner->is_input_section()); |
| 2597 | // Create a new relaxed input section. We need to lock the original |
| 2598 | // file. |
| 2599 | Task_lock_obj<Object> tl(task, owner->relobj()); |
| 2600 | input_section = |
| 2601 | target->new_aarch64_input_section(owner->relobj(), owner->shndx()); |
| 2602 | new_relaxed_sections.push_back(input_section); |
| 2603 | } |
| 2604 | |
| 2605 | // Create a stub table. |
| 2606 | The_stub_table* stub_table = |
| 2607 | target->new_stub_table(input_section); |
| 2608 | |
| 2609 | input_section->set_stub_table(stub_table); |
| 2610 | |
| 2611 | Input_section_list::const_iterator p = first; |
| 2612 | // Look for input sections or relaxed input sections in [first ... last]. |
| 2613 | do |
| 2614 | { |
| 2615 | if (p->is_input_section() || p->is_relaxed_input_section()) |
| 2616 | { |
| 2617 | // The stub table information for input sections live |
| 2618 | // in their objects. |
| 2619 | The_aarch64_relobj* aarch64_relobj = |
| 2620 | static_cast<The_aarch64_relobj*>(p->relobj()); |
| 2621 | aarch64_relobj->set_stub_table(p->shndx(), stub_table); |
| 2622 | } |
| 2623 | } |
| 2624 | while (p++ != last); |
| 2625 | } |
| 2626 | |
| 2627 | |
| 2628 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit of |
| 2629 | // stub groups. We grow a stub group by adding input section until the size is |
| 2630 | // just below GROUP_SIZE. The last input section will be converted into a stub |
| 2631 | // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond |
| 2632 | // after the stub table, effectively doubling the group size. |
| 2633 | // |
| 2634 | // This is similar to the group_sections() function in elf32-arm.c but is |
| 2635 | // implemented differently. |
| 2636 | |
| 2637 | template<int size, bool big_endian> |
| 2638 | void AArch64_output_section<size, big_endian>::group_sections( |
| 2639 | section_size_type group_size, |
| 2640 | bool stubs_always_after_branch, |
| 2641 | Target_aarch64<size, big_endian>* target, |
| 2642 | const Task* task) |
| 2643 | { |
| 2644 | typedef enum |
| 2645 | { |
| 2646 | NO_GROUP, |
| 2647 | FINDING_STUB_SECTION, |
| 2648 | HAS_STUB_SECTION |
| 2649 | } State; |
| 2650 | |
| 2651 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; |
| 2652 | |
| 2653 | State state = NO_GROUP; |
| 2654 | section_size_type off = 0; |
| 2655 | section_size_type group_begin_offset = 0; |
| 2656 | section_size_type group_end_offset = 0; |
| 2657 | section_size_type stub_table_end_offset = 0; |
| 2658 | Input_section_list::const_iterator group_begin = |
| 2659 | this->input_sections().end(); |
| 2660 | Input_section_list::const_iterator stub_table = |
| 2661 | this->input_sections().end(); |
| 2662 | Input_section_list::const_iterator group_end = this->input_sections().end(); |
| 2663 | for (Input_section_list::const_iterator p = this->input_sections().begin(); |
| 2664 | p != this->input_sections().end(); |
| 2665 | ++p) |
| 2666 | { |
| 2667 | section_size_type section_begin_offset = |
| 2668 | align_address(off, p->addralign()); |
| 2669 | section_size_type section_end_offset = |
| 2670 | section_begin_offset + p->data_size(); |
| 2671 | |
| 2672 | // Check to see if we should group the previously seen sections. |
| 2673 | switch (state) |
| 2674 | { |
| 2675 | case NO_GROUP: |
| 2676 | break; |
| 2677 | |
| 2678 | case FINDING_STUB_SECTION: |
| 2679 | // Adding this section makes the group larger than GROUP_SIZE. |
| 2680 | if (section_end_offset - group_begin_offset >= group_size) |
| 2681 | { |
| 2682 | if (stubs_always_after_branch) |
| 2683 | { |
| 2684 | gold_assert(group_end != this->input_sections().end()); |
| 2685 | this->create_stub_group(group_begin, group_end, group_end, |
| 2686 | target, new_relaxed_sections, |
| 2687 | task); |
| 2688 | state = NO_GROUP; |
| 2689 | } |
| 2690 | else |
| 2691 | { |
| 2692 | // Input sections up to stub_group_size bytes after the stub |
| 2693 | // table can be handled by it too. |
| 2694 | state = HAS_STUB_SECTION; |
| 2695 | stub_table = group_end; |
| 2696 | stub_table_end_offset = group_end_offset; |
| 2697 | } |
| 2698 | } |
| 2699 | break; |
| 2700 | |
| 2701 | case HAS_STUB_SECTION: |
| 2702 | // Adding this section makes the post stub-section group larger |
| 2703 | // than GROUP_SIZE. |
| 2704 | gold_unreachable(); |
| 2705 | // NOT SUPPORTED YET. For completeness only. |
| 2706 | if (section_end_offset - stub_table_end_offset >= group_size) |
| 2707 | { |
| 2708 | gold_assert(group_end != this->input_sections().end()); |
| 2709 | this->create_stub_group(group_begin, group_end, stub_table, |
| 2710 | target, new_relaxed_sections, task); |
| 2711 | state = NO_GROUP; |
| 2712 | } |
| 2713 | break; |
| 2714 | |
| 2715 | default: |
| 2716 | gold_unreachable(); |
| 2717 | } |
| 2718 | |
| 2719 | // If we see an input section and currently there is no group, start |
| 2720 | // a new one. Skip any empty sections. We look at the data size |
| 2721 | // instead of calling p->relobj()->section_size() to avoid locking. |
| 2722 | if ((p->is_input_section() || p->is_relaxed_input_section()) |
| 2723 | && (p->data_size() != 0)) |
| 2724 | { |
| 2725 | if (state == NO_GROUP) |
| 2726 | { |
| 2727 | state = FINDING_STUB_SECTION; |
| 2728 | group_begin = p; |
| 2729 | group_begin_offset = section_begin_offset; |
| 2730 | } |
| 2731 | |
| 2732 | // Keep track of the last input section seen. |
| 2733 | group_end = p; |
| 2734 | group_end_offset = section_end_offset; |
| 2735 | } |
| 2736 | |
| 2737 | off = section_end_offset; |
| 2738 | } |
| 2739 | |
| 2740 | // Create a stub group for any ungrouped sections. |
| 2741 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) |
| 2742 | { |
| 2743 | gold_assert(group_end != this->input_sections().end()); |
| 2744 | this->create_stub_group(group_begin, group_end, |
| 2745 | (state == FINDING_STUB_SECTION |
| 2746 | ? group_end |
| 2747 | : stub_table), |
| 2748 | target, new_relaxed_sections, task); |
| 2749 | } |
| 2750 | |
| 2751 | if (!new_relaxed_sections.empty()) |
| 2752 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); |
| 2753 | |
| 2754 | // Update the section offsets |
| 2755 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) |
| 2756 | { |
| 2757 | The_aarch64_relobj* relobj = static_cast<The_aarch64_relobj*>( |
| 2758 | new_relaxed_sections[i]->relobj()); |
| 2759 | unsigned int shndx = new_relaxed_sections[i]->shndx(); |
| 2760 | // Tell AArch64_relobj that this input section is converted. |
| 2761 | relobj->convert_input_section_to_relaxed_section(shndx); |
| 2762 | } |
| 2763 | } // End of AArch64_output_section::group_sections |
| 2764 | |
| 2765 | |
| 2766 | AArch64_reloc_property_table* aarch64_reloc_property_table = NULL; |
| 2767 | |
| 2768 | |
| 2769 | // The aarch64 target class. |
| 2770 | // See the ABI at |
| 2771 | // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf |
| 2772 | template<int size, bool big_endian> |
| 2773 | class Target_aarch64 : public Sized_target<size, big_endian> |
| 2774 | { |
| 2775 | public: |
| 2776 | typedef Target_aarch64<size, big_endian> This; |
| 2777 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 2778 | Reloc_section; |
| 2779 | typedef Relocate_info<size, big_endian> The_relocate_info; |
| 2780 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 2781 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 2782 | typedef Reloc_stub<size, big_endian> The_reloc_stub; |
| 2783 | typedef Erratum_stub<size, big_endian> The_erratum_stub; |
| 2784 | typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key; |
| 2785 | typedef Stub_table<size, big_endian> The_stub_table; |
| 2786 | typedef std::vector<The_stub_table*> Stub_table_list; |
| 2787 | typedef typename Stub_table_list::iterator Stub_table_iterator; |
| 2788 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; |
| 2789 | typedef AArch64_output_section<size, big_endian> The_aarch64_output_section; |
| 2790 | typedef Unordered_map<Section_id, |
| 2791 | AArch64_input_section<size, big_endian>*, |
| 2792 | Section_id_hash> AArch64_input_section_map; |
| 2793 | typedef AArch64_insn_utilities<big_endian> Insn_utilities; |
| 2794 | const static int TCB_SIZE = size / 8 * 2; |
| 2795 | |
| 2796 | Target_aarch64(const Target::Target_info* info = &aarch64_info) |
| 2797 | : Sized_target<size, big_endian>(info), |
| 2798 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
| 2799 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), |
| 2800 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY), |
| 2801 | got_mod_index_offset_(-1U), |
| 2802 | tlsdesc_reloc_info_(), tls_base_symbol_defined_(false), |
| 2803 | stub_tables_(), stub_group_size_(0), aarch64_input_section_map_() |
| 2804 | { } |
| 2805 | |
| 2806 | // Scan the relocations to determine unreferenced sections for |
| 2807 | // garbage collection. |
| 2808 | void |
| 2809 | gc_process_relocs(Symbol_table* symtab, |
| 2810 | Layout* layout, |
| 2811 | Sized_relobj_file<size, big_endian>* object, |
| 2812 | unsigned int data_shndx, |
| 2813 | unsigned int sh_type, |
| 2814 | const unsigned char* prelocs, |
| 2815 | size_t reloc_count, |
| 2816 | Output_section* output_section, |
| 2817 | bool needs_special_offset_handling, |
| 2818 | size_t local_symbol_count, |
| 2819 | const unsigned char* plocal_symbols); |
| 2820 | |
| 2821 | // Scan the relocations to look for symbol adjustments. |
| 2822 | void |
| 2823 | scan_relocs(Symbol_table* symtab, |
| 2824 | Layout* layout, |
| 2825 | Sized_relobj_file<size, big_endian>* object, |
| 2826 | unsigned int data_shndx, |
| 2827 | unsigned int sh_type, |
| 2828 | const unsigned char* prelocs, |
| 2829 | size_t reloc_count, |
| 2830 | Output_section* output_section, |
| 2831 | bool needs_special_offset_handling, |
| 2832 | size_t local_symbol_count, |
| 2833 | const unsigned char* plocal_symbols); |
| 2834 | |
| 2835 | // Finalize the sections. |
| 2836 | void |
| 2837 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
| 2838 | |
| 2839 | // Return the value to use for a dynamic which requires special |
| 2840 | // treatment. |
| 2841 | uint64_t |
| 2842 | do_dynsym_value(const Symbol*) const; |
| 2843 | |
| 2844 | // Relocate a section. |
| 2845 | void |
| 2846 | relocate_section(const Relocate_info<size, big_endian>*, |
| 2847 | unsigned int sh_type, |
| 2848 | const unsigned char* prelocs, |
| 2849 | size_t reloc_count, |
| 2850 | Output_section* output_section, |
| 2851 | bool needs_special_offset_handling, |
| 2852 | unsigned char* view, |
| 2853 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 2854 | section_size_type view_size, |
| 2855 | const Reloc_symbol_changes*); |
| 2856 | |
| 2857 | // Scan the relocs during a relocatable link. |
| 2858 | void |
| 2859 | scan_relocatable_relocs(Symbol_table* symtab, |
| 2860 | Layout* layout, |
| 2861 | Sized_relobj_file<size, big_endian>* object, |
| 2862 | unsigned int data_shndx, |
| 2863 | unsigned int sh_type, |
| 2864 | const unsigned char* prelocs, |
| 2865 | size_t reloc_count, |
| 2866 | Output_section* output_section, |
| 2867 | bool needs_special_offset_handling, |
| 2868 | size_t local_symbol_count, |
| 2869 | const unsigned char* plocal_symbols, |
| 2870 | Relocatable_relocs*); |
| 2871 | |
| 2872 | // Relocate a section during a relocatable link. |
| 2873 | void |
| 2874 | relocate_relocs( |
| 2875 | const Relocate_info<size, big_endian>*, |
| 2876 | unsigned int sh_type, |
| 2877 | const unsigned char* prelocs, |
| 2878 | size_t reloc_count, |
| 2879 | Output_section* output_section, |
| 2880 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 2881 | const Relocatable_relocs*, |
| 2882 | unsigned char* view, |
| 2883 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 2884 | section_size_type view_size, |
| 2885 | unsigned char* reloc_view, |
| 2886 | section_size_type reloc_view_size); |
| 2887 | |
| 2888 | // Return the symbol index to use for a target specific relocation. |
| 2889 | // The only target specific relocation is R_AARCH64_TLSDESC for a |
| 2890 | // local symbol, which is an absolute reloc. |
| 2891 | unsigned int |
| 2892 | do_reloc_symbol_index(void*, unsigned int r_type) const |
| 2893 | { |
| 2894 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); |
| 2895 | return 0; |
| 2896 | } |
| 2897 | |
| 2898 | // Return the addend to use for a target specific relocation. |
| 2899 | uint64_t |
| 2900 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; |
| 2901 | |
| 2902 | // Return the PLT section. |
| 2903 | uint64_t |
| 2904 | do_plt_address_for_global(const Symbol* gsym) const |
| 2905 | { return this->plt_section()->address_for_global(gsym); } |
| 2906 | |
| 2907 | uint64_t |
| 2908 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const |
| 2909 | { return this->plt_section()->address_for_local(relobj, symndx); } |
| 2910 | |
| 2911 | // This function should be defined in targets that can use relocation |
| 2912 | // types to determine (implemented in local_reloc_may_be_function_pointer |
| 2913 | // and global_reloc_may_be_function_pointer) |
| 2914 | // if a function's pointer is taken. ICF uses this in safe mode to only |
| 2915 | // fold those functions whose pointer is defintely not taken. |
| 2916 | bool |
| 2917 | do_can_check_for_function_pointers() const |
| 2918 | { return true; } |
| 2919 | |
| 2920 | // Return the number of entries in the PLT. |
| 2921 | unsigned int |
| 2922 | plt_entry_count() const; |
| 2923 | |
| 2924 | //Return the offset of the first non-reserved PLT entry. |
| 2925 | unsigned int |
| 2926 | first_plt_entry_offset() const; |
| 2927 | |
| 2928 | // Return the size of each PLT entry. |
| 2929 | unsigned int |
| 2930 | plt_entry_size() const; |
| 2931 | |
| 2932 | // Create a stub table. |
| 2933 | The_stub_table* |
| 2934 | new_stub_table(The_aarch64_input_section*); |
| 2935 | |
| 2936 | // Create an aarch64 input section. |
| 2937 | The_aarch64_input_section* |
| 2938 | new_aarch64_input_section(Relobj*, unsigned int); |
| 2939 | |
| 2940 | // Find an aarch64 input section instance for a given OBJ and SHNDX. |
| 2941 | The_aarch64_input_section* |
| 2942 | find_aarch64_input_section(Relobj*, unsigned int) const; |
| 2943 | |
| 2944 | // Return the thread control block size. |
| 2945 | unsigned int |
| 2946 | tcb_size() const { return This::TCB_SIZE; } |
| 2947 | |
| 2948 | // Scan a section for stub generation. |
| 2949 | void |
| 2950 | scan_section_for_stubs(const Relocate_info<size, big_endian>*, unsigned int, |
| 2951 | const unsigned char*, size_t, Output_section*, |
| 2952 | bool, const unsigned char*, |
| 2953 | Address, |
| 2954 | section_size_type); |
| 2955 | |
| 2956 | // Scan a relocation section for stub. |
| 2957 | template<int sh_type> |
| 2958 | void |
| 2959 | scan_reloc_section_for_stubs( |
| 2960 | const The_relocate_info* relinfo, |
| 2961 | const unsigned char* prelocs, |
| 2962 | size_t reloc_count, |
| 2963 | Output_section* output_section, |
| 2964 | bool needs_special_offset_handling, |
| 2965 | const unsigned char* view, |
| 2966 | Address view_address, |
| 2967 | section_size_type); |
| 2968 | |
| 2969 | // Relocate a single stub. |
| 2970 | void |
| 2971 | relocate_stub(The_reloc_stub*, const Relocate_info<size, big_endian>*, |
| 2972 | Output_section*, unsigned char*, Address, |
| 2973 | section_size_type); |
| 2974 | |
| 2975 | // Get the default AArch64 target. |
| 2976 | static This* |
| 2977 | current_target() |
| 2978 | { |
| 2979 | gold_assert(parameters->target().machine_code() == elfcpp::EM_AARCH64 |
| 2980 | && parameters->target().get_size() == size |
| 2981 | && parameters->target().is_big_endian() == big_endian); |
| 2982 | return static_cast<This*>(parameters->sized_target<size, big_endian>()); |
| 2983 | } |
| 2984 | |
| 2985 | |
| 2986 | // Scan erratum 843419 for a part of a section. |
| 2987 | void |
| 2988 | scan_erratum_843419_span( |
| 2989 | AArch64_relobj<size, big_endian>*, |
| 2990 | unsigned int, |
| 2991 | const section_size_type, |
| 2992 | const section_size_type, |
| 2993 | unsigned char*, |
| 2994 | Address); |
| 2995 | |
| 2996 | // Scan erratum 835769 for a part of a section. |
| 2997 | void |
| 2998 | scan_erratum_835769_span( |
| 2999 | AArch64_relobj<size, big_endian>*, |
| 3000 | unsigned int, |
| 3001 | const section_size_type, |
| 3002 | const section_size_type, |
| 3003 | unsigned char*, |
| 3004 | Address); |
| 3005 | |
| 3006 | protected: |
| 3007 | void |
| 3008 | do_select_as_default_target() |
| 3009 | { |
| 3010 | gold_assert(aarch64_reloc_property_table == NULL); |
| 3011 | aarch64_reloc_property_table = new AArch64_reloc_property_table(); |
| 3012 | } |
| 3013 | |
| 3014 | // Add a new reloc argument, returning the index in the vector. |
| 3015 | size_t |
| 3016 | add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object, |
| 3017 | unsigned int r_sym) |
| 3018 | { |
| 3019 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); |
| 3020 | return this->tlsdesc_reloc_info_.size() - 1; |
| 3021 | } |
| 3022 | |
| 3023 | virtual Output_data_plt_aarch64<size, big_endian>* |
| 3024 | do_make_data_plt(Layout* layout, |
| 3025 | Output_data_got_aarch64<size, big_endian>* got, |
| 3026 | Output_data_space* got_plt, |
| 3027 | Output_data_space* got_irelative) |
| 3028 | { |
| 3029 | return new Output_data_plt_aarch64_standard<size, big_endian>( |
| 3030 | layout, got, got_plt, got_irelative); |
| 3031 | } |
| 3032 | |
| 3033 | |
| 3034 | // do_make_elf_object to override the same function in the base class. |
| 3035 | Object* |
| 3036 | do_make_elf_object(const std::string&, Input_file*, off_t, |
| 3037 | const elfcpp::Ehdr<size, big_endian>&); |
| 3038 | |
| 3039 | Output_data_plt_aarch64<size, big_endian>* |
| 3040 | make_data_plt(Layout* layout, |
| 3041 | Output_data_got_aarch64<size, big_endian>* got, |
| 3042 | Output_data_space* got_plt, |
| 3043 | Output_data_space* got_irelative) |
| 3044 | { |
| 3045 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); |
| 3046 | } |
| 3047 | |
| 3048 | // We only need to generate stubs, and hence perform relaxation if we are |
| 3049 | // not doing relocatable linking. |
| 3050 | virtual bool |
| 3051 | do_may_relax() const |
| 3052 | { return !parameters->options().relocatable(); } |
| 3053 | |
| 3054 | // Relaxation hook. This is where we do stub generation. |
| 3055 | virtual bool |
| 3056 | do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*); |
| 3057 | |
| 3058 | void |
| 3059 | group_sections(Layout* layout, |
| 3060 | section_size_type group_size, |
| 3061 | bool stubs_always_after_branch, |
| 3062 | const Task* task); |
| 3063 | |
| 3064 | void |
| 3065 | scan_reloc_for_stub(const The_relocate_info*, unsigned int, |
| 3066 | const Sized_symbol<size>*, unsigned int, |
| 3067 | const Symbol_value<size>*, |
| 3068 | typename elfcpp::Elf_types<size>::Elf_Swxword, |
| 3069 | Address Elf_Addr); |
| 3070 | |
| 3071 | // Make an output section. |
| 3072 | Output_section* |
| 3073 | do_make_output_section(const char* name, elfcpp::Elf_Word type, |
| 3074 | elfcpp::Elf_Xword flags) |
| 3075 | { return new The_aarch64_output_section(name, type, flags); } |
| 3076 | |
| 3077 | private: |
| 3078 | // The class which scans relocations. |
| 3079 | class Scan |
| 3080 | { |
| 3081 | public: |
| 3082 | Scan() |
| 3083 | : issued_non_pic_error_(false) |
| 3084 | { } |
| 3085 | |
| 3086 | inline void |
| 3087 | local(Symbol_table* symtab, Layout* layout, Target_aarch64* target, |
| 3088 | Sized_relobj_file<size, big_endian>* object, |
| 3089 | unsigned int data_shndx, |
| 3090 | Output_section* output_section, |
| 3091 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 3092 | const elfcpp::Sym<size, big_endian>& lsym, |
| 3093 | bool is_discarded); |
| 3094 | |
| 3095 | inline void |
| 3096 | global(Symbol_table* symtab, Layout* layout, Target_aarch64* target, |
| 3097 | Sized_relobj_file<size, big_endian>* object, |
| 3098 | unsigned int data_shndx, |
| 3099 | Output_section* output_section, |
| 3100 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, |
| 3101 | Symbol* gsym); |
| 3102 | |
| 3103 | inline bool |
| 3104 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 3105 | Target_aarch64<size, big_endian>* , |
| 3106 | Sized_relobj_file<size, big_endian>* , |
| 3107 | unsigned int , |
| 3108 | Output_section* , |
| 3109 | const elfcpp::Rela<size, big_endian>& , |
| 3110 | unsigned int r_type, |
| 3111 | const elfcpp::Sym<size, big_endian>&); |
| 3112 | |
| 3113 | inline bool |
| 3114 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , |
| 3115 | Target_aarch64<size, big_endian>* , |
| 3116 | Sized_relobj_file<size, big_endian>* , |
| 3117 | unsigned int , |
| 3118 | Output_section* , |
| 3119 | const elfcpp::Rela<size, big_endian>& , |
| 3120 | unsigned int r_type, |
| 3121 | Symbol* gsym); |
| 3122 | |
| 3123 | private: |
| 3124 | static void |
| 3125 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, |
| 3126 | unsigned int r_type); |
| 3127 | |
| 3128 | static void |
| 3129 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, |
| 3130 | unsigned int r_type, Symbol*); |
| 3131 | |
| 3132 | inline bool |
| 3133 | possible_function_pointer_reloc(unsigned int r_type); |
| 3134 | |
| 3135 | void |
| 3136 | check_non_pic(Relobj*, unsigned int r_type); |
| 3137 | |
| 3138 | bool |
| 3139 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>*, |
| 3140 | unsigned int r_type); |
| 3141 | |
| 3142 | // Whether we have issued an error about a non-PIC compilation. |
| 3143 | bool issued_non_pic_error_; |
| 3144 | }; |
| 3145 | |
| 3146 | // The class which implements relocation. |
| 3147 | class Relocate |
| 3148 | { |
| 3149 | public: |
| 3150 | Relocate() |
| 3151 | : skip_call_tls_get_addr_(false) |
| 3152 | { } |
| 3153 | |
| 3154 | ~Relocate() |
| 3155 | { } |
| 3156 | |
| 3157 | // Do a relocation. Return false if the caller should not issue |
| 3158 | // any warnings about this relocation. |
| 3159 | inline bool |
| 3160 | relocate(const Relocate_info<size, big_endian>*, Target_aarch64*, |
| 3161 | Output_section*, |
| 3162 | size_t relnum, const elfcpp::Rela<size, big_endian>&, |
| 3163 | unsigned int r_type, const Sized_symbol<size>*, |
| 3164 | const Symbol_value<size>*, |
| 3165 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
| 3166 | section_size_type); |
| 3167 | |
| 3168 | private: |
| 3169 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 3170 | relocate_tls(const Relocate_info<size, big_endian>*, |
| 3171 | Target_aarch64<size, big_endian>*, |
| 3172 | size_t, |
| 3173 | const elfcpp::Rela<size, big_endian>&, |
| 3174 | unsigned int r_type, const Sized_symbol<size>*, |
| 3175 | const Symbol_value<size>*, |
| 3176 | unsigned char*, |
| 3177 | typename elfcpp::Elf_types<size>::Elf_Addr); |
| 3178 | |
| 3179 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 3180 | tls_gd_to_le( |
| 3181 | const Relocate_info<size, big_endian>*, |
| 3182 | Target_aarch64<size, big_endian>*, |
| 3183 | const elfcpp::Rela<size, big_endian>&, |
| 3184 | unsigned int, |
| 3185 | unsigned char*, |
| 3186 | const Symbol_value<size>*); |
| 3187 | |
| 3188 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 3189 | tls_ld_to_le( |
| 3190 | const Relocate_info<size, big_endian>*, |
| 3191 | Target_aarch64<size, big_endian>*, |
| 3192 | const elfcpp::Rela<size, big_endian>&, |
| 3193 | unsigned int, |
| 3194 | unsigned char*, |
| 3195 | const Symbol_value<size>*); |
| 3196 | |
| 3197 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 3198 | tls_ie_to_le( |
| 3199 | const Relocate_info<size, big_endian>*, |
| 3200 | Target_aarch64<size, big_endian>*, |
| 3201 | const elfcpp::Rela<size, big_endian>&, |
| 3202 | unsigned int, |
| 3203 | unsigned char*, |
| 3204 | const Symbol_value<size>*); |
| 3205 | |
| 3206 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 3207 | tls_desc_gd_to_le( |
| 3208 | const Relocate_info<size, big_endian>*, |
| 3209 | Target_aarch64<size, big_endian>*, |
| 3210 | const elfcpp::Rela<size, big_endian>&, |
| 3211 | unsigned int, |
| 3212 | unsigned char*, |
| 3213 | const Symbol_value<size>*); |
| 3214 | |
| 3215 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
| 3216 | tls_desc_gd_to_ie( |
| 3217 | const Relocate_info<size, big_endian>*, |
| 3218 | Target_aarch64<size, big_endian>*, |
| 3219 | const elfcpp::Rela<size, big_endian>&, |
| 3220 | unsigned int, |
| 3221 | unsigned char*, |
| 3222 | const Symbol_value<size>*, |
| 3223 | typename elfcpp::Elf_types<size>::Elf_Addr, |
| 3224 | typename elfcpp::Elf_types<size>::Elf_Addr); |
| 3225 | |
| 3226 | bool skip_call_tls_get_addr_; |
| 3227 | |
| 3228 | }; // End of class Relocate |
| 3229 | |
| 3230 | // A class which returns the size required for a relocation type, |
| 3231 | // used while scanning relocs during a relocatable link. |
| 3232 | class Relocatable_size_for_reloc |
| 3233 | { |
| 3234 | public: |
| 3235 | unsigned int |
| 3236 | get_size_for_reloc(unsigned int, Relobj*); |
| 3237 | }; |
| 3238 | |
| 3239 | // Adjust TLS relocation type based on the options and whether this |
| 3240 | // is a local symbol. |
| 3241 | static tls::Tls_optimization |
| 3242 | optimize_tls_reloc(bool is_final, int r_type); |
| 3243 | |
| 3244 | // Get the GOT section, creating it if necessary. |
| 3245 | Output_data_got_aarch64<size, big_endian>* |
| 3246 | got_section(Symbol_table*, Layout*); |
| 3247 | |
| 3248 | // Get the GOT PLT section. |
| 3249 | Output_data_space* |
| 3250 | got_plt_section() const |
| 3251 | { |
| 3252 | gold_assert(this->got_plt_ != NULL); |
| 3253 | return this->got_plt_; |
| 3254 | } |
| 3255 | |
| 3256 | // Get the GOT section for TLSDESC entries. |
| 3257 | Output_data_got<size, big_endian>* |
| 3258 | got_tlsdesc_section() const |
| 3259 | { |
| 3260 | gold_assert(this->got_tlsdesc_ != NULL); |
| 3261 | return this->got_tlsdesc_; |
| 3262 | } |
| 3263 | |
| 3264 | // Create the PLT section. |
| 3265 | void |
| 3266 | make_plt_section(Symbol_table* symtab, Layout* layout); |
| 3267 | |
| 3268 | // Create a PLT entry for a global symbol. |
| 3269 | void |
| 3270 | make_plt_entry(Symbol_table*, Layout*, Symbol*); |
| 3271 | |
| 3272 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
| 3273 | void |
| 3274 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, |
| 3275 | Sized_relobj_file<size, big_endian>* relobj, |
| 3276 | unsigned int local_sym_index); |
| 3277 | |
| 3278 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
| 3279 | void |
| 3280 | define_tls_base_symbol(Symbol_table*, Layout*); |
| 3281 | |
| 3282 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
| 3283 | void |
| 3284 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); |
| 3285 | |
| 3286 | // Create a GOT entry for the TLS module index. |
| 3287 | unsigned int |
| 3288 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
| 3289 | Sized_relobj_file<size, big_endian>* object); |
| 3290 | |
| 3291 | // Get the PLT section. |
| 3292 | Output_data_plt_aarch64<size, big_endian>* |
| 3293 | plt_section() const |
| 3294 | { |
| 3295 | gold_assert(this->plt_ != NULL); |
| 3296 | return this->plt_; |
| 3297 | } |
| 3298 | |
| 3299 | // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For |
| 3300 | // ST_E_843419, we need an additional field for adrp offset. |
| 3301 | void create_erratum_stub( |
| 3302 | AArch64_relobj<size, big_endian>* relobj, |
| 3303 | unsigned int shndx, |
| 3304 | section_size_type erratum_insn_offset, |
| 3305 | Address erratum_address, |
| 3306 | typename Insn_utilities::Insntype erratum_insn, |
| 3307 | int erratum_type, |
| 3308 | unsigned int e843419_adrp_offset=0); |
| 3309 | |
| 3310 | // Return whether this is a 3-insn erratum sequence. |
| 3311 | bool is_erratum_843419_sequence( |
| 3312 | typename elfcpp::Swap<32,big_endian>::Valtype insn1, |
| 3313 | typename elfcpp::Swap<32,big_endian>::Valtype insn2, |
| 3314 | typename elfcpp::Swap<32,big_endian>::Valtype insn3); |
| 3315 | |
| 3316 | // Return whether this is a 835769 sequence. |
| 3317 | // (Similarly implemented as in elfnn-aarch64.c.) |
| 3318 | bool is_erratum_835769_sequence( |
| 3319 | typename elfcpp::Swap<32,big_endian>::Valtype, |
| 3320 | typename elfcpp::Swap<32,big_endian>::Valtype); |
| 3321 | |
| 3322 | // Get the dynamic reloc section, creating it if necessary. |
| 3323 | Reloc_section* |
| 3324 | rela_dyn_section(Layout*); |
| 3325 | |
| 3326 | // Get the section to use for TLSDESC relocations. |
| 3327 | Reloc_section* |
| 3328 | rela_tlsdesc_section(Layout*) const; |
| 3329 | |
| 3330 | // Get the section to use for IRELATIVE relocations. |
| 3331 | Reloc_section* |
| 3332 | rela_irelative_section(Layout*); |
| 3333 | |
| 3334 | // Add a potential copy relocation. |
| 3335 | void |
| 3336 | copy_reloc(Symbol_table* symtab, Layout* layout, |
| 3337 | Sized_relobj_file<size, big_endian>* object, |
| 3338 | unsigned int shndx, Output_section* output_section, |
| 3339 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) |
| 3340 | { |
| 3341 | this->copy_relocs_.copy_reloc(symtab, layout, |
| 3342 | symtab->get_sized_symbol<size>(sym), |
| 3343 | object, shndx, output_section, |
| 3344 | reloc, this->rela_dyn_section(layout)); |
| 3345 | } |
| 3346 | |
| 3347 | // Information about this specific target which we pass to the |
| 3348 | // general Target structure. |
| 3349 | static const Target::Target_info aarch64_info; |
| 3350 | |
| 3351 | // The types of GOT entries needed for this platform. |
| 3352 | // These values are exposed to the ABI in an incremental link. |
| 3353 | // Do not renumber existing values without changing the version |
| 3354 | // number of the .gnu_incremental_inputs section. |
| 3355 | enum Got_type |
| 3356 | { |
| 3357 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol |
| 3358 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset |
| 3359 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair |
| 3360 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair |
| 3361 | }; |
| 3362 | |
| 3363 | // This type is used as the argument to the target specific |
| 3364 | // relocation routines. The only target specific reloc is |
| 3365 | // R_AARCh64_TLSDESC against a local symbol. |
| 3366 | struct Tlsdesc_info |
| 3367 | { |
| 3368 | Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object, |
| 3369 | unsigned int a_r_sym) |
| 3370 | : object(a_object), r_sym(a_r_sym) |
| 3371 | { } |
| 3372 | |
| 3373 | // The object in which the local symbol is defined. |
| 3374 | Sized_relobj_file<size, big_endian>* object; |
| 3375 | // The local symbol index in the object. |
| 3376 | unsigned int r_sym; |
| 3377 | }; |
| 3378 | |
| 3379 | // The GOT section. |
| 3380 | Output_data_got_aarch64<size, big_endian>* got_; |
| 3381 | // The PLT section. |
| 3382 | Output_data_plt_aarch64<size, big_endian>* plt_; |
| 3383 | // The GOT PLT section. |
| 3384 | Output_data_space* got_plt_; |
| 3385 | // The GOT section for IRELATIVE relocations. |
| 3386 | Output_data_space* got_irelative_; |
| 3387 | // The GOT section for TLSDESC relocations. |
| 3388 | Output_data_got<size, big_endian>* got_tlsdesc_; |
| 3389 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
| 3390 | Symbol* global_offset_table_; |
| 3391 | // The dynamic reloc section. |
| 3392 | Reloc_section* rela_dyn_; |
| 3393 | // The section to use for IRELATIVE relocs. |
| 3394 | Reloc_section* rela_irelative_; |
| 3395 | // Relocs saved to avoid a COPY reloc. |
| 3396 | Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; |
| 3397 | // Offset of the GOT entry for the TLS module index. |
| 3398 | unsigned int got_mod_index_offset_; |
| 3399 | // We handle R_AARCH64_TLSDESC against a local symbol as a target |
| 3400 | // specific relocation. Here we store the object and local symbol |
| 3401 | // index for the relocation. |
| 3402 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; |
| 3403 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
| 3404 | bool tls_base_symbol_defined_; |
| 3405 | // List of stub_tables |
| 3406 | Stub_table_list stub_tables_; |
| 3407 | // Actual stub group size |
| 3408 | section_size_type stub_group_size_; |
| 3409 | AArch64_input_section_map aarch64_input_section_map_; |
| 3410 | }; // End of Target_aarch64 |
| 3411 | |
| 3412 | |
| 3413 | template<> |
| 3414 | const Target::Target_info Target_aarch64<64, false>::aarch64_info = |
| 3415 | { |
| 3416 | 64, // size |
| 3417 | false, // is_big_endian |
| 3418 | elfcpp::EM_AARCH64, // machine_code |
| 3419 | false, // has_make_symbol |
| 3420 | false, // has_resolve |
| 3421 | false, // has_code_fill |
| 3422 | true, // is_default_stack_executable |
| 3423 | true, // can_icf_inline_merge_sections |
| 3424 | '\0', // wrap_char |
| 3425 | "/lib/ld.so.1", // program interpreter |
| 3426 | 0x400000, // default_text_segment_address |
| 3427 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
| 3428 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 3429 | false, // isolate_execinstr |
| 3430 | 0, // rosegment_gap |
| 3431 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 3432 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 3433 | 0, // small_common_section_flags |
| 3434 | 0, // large_common_section_flags |
| 3435 | NULL, // attributes_section |
| 3436 | NULL, // attributes_vendor |
| 3437 | "_start", // entry_symbol_name |
| 3438 | 32, // hash_entry_size |
| 3439 | }; |
| 3440 | |
| 3441 | template<> |
| 3442 | const Target::Target_info Target_aarch64<32, false>::aarch64_info = |
| 3443 | { |
| 3444 | 32, // size |
| 3445 | false, // is_big_endian |
| 3446 | elfcpp::EM_AARCH64, // machine_code |
| 3447 | false, // has_make_symbol |
| 3448 | false, // has_resolve |
| 3449 | false, // has_code_fill |
| 3450 | true, // is_default_stack_executable |
| 3451 | false, // can_icf_inline_merge_sections |
| 3452 | '\0', // wrap_char |
| 3453 | "/lib/ld.so.1", // program interpreter |
| 3454 | 0x400000, // default_text_segment_address |
| 3455 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
| 3456 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 3457 | false, // isolate_execinstr |
| 3458 | 0, // rosegment_gap |
| 3459 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 3460 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 3461 | 0, // small_common_section_flags |
| 3462 | 0, // large_common_section_flags |
| 3463 | NULL, // attributes_section |
| 3464 | NULL, // attributes_vendor |
| 3465 | "_start", // entry_symbol_name |
| 3466 | 32, // hash_entry_size |
| 3467 | }; |
| 3468 | |
| 3469 | template<> |
| 3470 | const Target::Target_info Target_aarch64<64, true>::aarch64_info = |
| 3471 | { |
| 3472 | 64, // size |
| 3473 | true, // is_big_endian |
| 3474 | elfcpp::EM_AARCH64, // machine_code |
| 3475 | false, // has_make_symbol |
| 3476 | false, // has_resolve |
| 3477 | false, // has_code_fill |
| 3478 | true, // is_default_stack_executable |
| 3479 | true, // can_icf_inline_merge_sections |
| 3480 | '\0', // wrap_char |
| 3481 | "/lib/ld.so.1", // program interpreter |
| 3482 | 0x400000, // default_text_segment_address |
| 3483 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
| 3484 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 3485 | false, // isolate_execinstr |
| 3486 | 0, // rosegment_gap |
| 3487 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 3488 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 3489 | 0, // small_common_section_flags |
| 3490 | 0, // large_common_section_flags |
| 3491 | NULL, // attributes_section |
| 3492 | NULL, // attributes_vendor |
| 3493 | "_start", // entry_symbol_name |
| 3494 | 32, // hash_entry_size |
| 3495 | }; |
| 3496 | |
| 3497 | template<> |
| 3498 | const Target::Target_info Target_aarch64<32, true>::aarch64_info = |
| 3499 | { |
| 3500 | 32, // size |
| 3501 | true, // is_big_endian |
| 3502 | elfcpp::EM_AARCH64, // machine_code |
| 3503 | false, // has_make_symbol |
| 3504 | false, // has_resolve |
| 3505 | false, // has_code_fill |
| 3506 | true, // is_default_stack_executable |
| 3507 | false, // can_icf_inline_merge_sections |
| 3508 | '\0', // wrap_char |
| 3509 | "/lib/ld.so.1", // program interpreter |
| 3510 | 0x400000, // default_text_segment_address |
| 3511 | 0x10000, // abi_pagesize (overridable by -z max-page-size) |
| 3512 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
| 3513 | false, // isolate_execinstr |
| 3514 | 0, // rosegment_gap |
| 3515 | elfcpp::SHN_UNDEF, // small_common_shndx |
| 3516 | elfcpp::SHN_UNDEF, // large_common_shndx |
| 3517 | 0, // small_common_section_flags |
| 3518 | 0, // large_common_section_flags |
| 3519 | NULL, // attributes_section |
| 3520 | NULL, // attributes_vendor |
| 3521 | "_start", // entry_symbol_name |
| 3522 | 32, // hash_entry_size |
| 3523 | }; |
| 3524 | |
| 3525 | // Get the GOT section, creating it if necessary. |
| 3526 | |
| 3527 | template<int size, bool big_endian> |
| 3528 | Output_data_got_aarch64<size, big_endian>* |
| 3529 | Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab, |
| 3530 | Layout* layout) |
| 3531 | { |
| 3532 | if (this->got_ == NULL) |
| 3533 | { |
| 3534 | gold_assert(symtab != NULL && layout != NULL); |
| 3535 | |
| 3536 | // When using -z now, we can treat .got.plt as a relro section. |
| 3537 | // Without -z now, it is modified after program startup by lazy |
| 3538 | // PLT relocations. |
| 3539 | bool is_got_plt_relro = parameters->options().now(); |
| 3540 | Output_section_order got_order = (is_got_plt_relro |
| 3541 | ? ORDER_RELRO |
| 3542 | : ORDER_RELRO_LAST); |
| 3543 | Output_section_order got_plt_order = (is_got_plt_relro |
| 3544 | ? ORDER_RELRO |
| 3545 | : ORDER_NON_RELRO_FIRST); |
| 3546 | |
| 3547 | // Layout of .got and .got.plt sections. |
| 3548 | // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_ |
| 3549 | // ... |
| 3550 | // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT |
| 3551 | // .gotplt[1] reserved for ld.so (resolver) |
| 3552 | // .gotplt[2] reserved |
| 3553 | |
| 3554 | // Generate .got section. |
| 3555 | this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab, |
| 3556 | layout); |
| 3557 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
| 3558 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
| 3559 | this->got_, got_order, true); |
| 3560 | // The first word of GOT is reserved for the address of .dynamic. |
| 3561 | // We put 0 here now. The value will be replaced later in |
| 3562 | // Output_data_got_aarch64::do_write. |
| 3563 | this->got_->add_constant(0); |
| 3564 | |
| 3565 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
| 3566 | // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section, |
| 3567 | // even if there is a .got.plt section. |
| 3568 | this->global_offset_table_ = |
| 3569 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
| 3570 | Symbol_table::PREDEFINED, |
| 3571 | this->got_, |
| 3572 | 0, 0, elfcpp::STT_OBJECT, |
| 3573 | elfcpp::STB_LOCAL, |
| 3574 | elfcpp::STV_HIDDEN, 0, |
| 3575 | false, false); |
| 3576 | |
| 3577 | // Generate .got.plt section. |
| 3578 | this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT"); |
| 3579 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| 3580 | (elfcpp::SHF_ALLOC |
| 3581 | | elfcpp::SHF_WRITE), |
| 3582 | this->got_plt_, got_plt_order, |
| 3583 | is_got_plt_relro); |
| 3584 | |
| 3585 | // The first three entries are reserved. |
| 3586 | this->got_plt_->set_current_data_size( |
| 3587 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); |
| 3588 | |
| 3589 | // If there are any IRELATIVE relocations, they get GOT entries |
| 3590 | // in .got.plt after the jump slot entries. |
| 3591 | this->got_irelative_ = new Output_data_space(size / 8, |
| 3592 | "** GOT IRELATIVE PLT"); |
| 3593 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| 3594 | (elfcpp::SHF_ALLOC |
| 3595 | | elfcpp::SHF_WRITE), |
| 3596 | this->got_irelative_, |
| 3597 | got_plt_order, |
| 3598 | is_got_plt_relro); |
| 3599 | |
| 3600 | // If there are any TLSDESC relocations, they get GOT entries in |
| 3601 | // .got.plt after the jump slot and IRELATIVE entries. |
| 3602 | this->got_tlsdesc_ = new Output_data_got<size, big_endian>(); |
| 3603 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
| 3604 | (elfcpp::SHF_ALLOC |
| 3605 | | elfcpp::SHF_WRITE), |
| 3606 | this->got_tlsdesc_, |
| 3607 | got_plt_order, |
| 3608 | is_got_plt_relro); |
| 3609 | |
| 3610 | if (!is_got_plt_relro) |
| 3611 | { |
| 3612 | // Those bytes can go into the relro segment. |
| 3613 | layout->increase_relro( |
| 3614 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); |
| 3615 | } |
| 3616 | |
| 3617 | } |
| 3618 | return this->got_; |
| 3619 | } |
| 3620 | |
| 3621 | // Get the dynamic reloc section, creating it if necessary. |
| 3622 | |
| 3623 | template<int size, bool big_endian> |
| 3624 | typename Target_aarch64<size, big_endian>::Reloc_section* |
| 3625 | Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout) |
| 3626 | { |
| 3627 | if (this->rela_dyn_ == NULL) |
| 3628 | { |
| 3629 | gold_assert(layout != NULL); |
| 3630 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
| 3631 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 3632 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
| 3633 | ORDER_DYNAMIC_RELOCS, false); |
| 3634 | } |
| 3635 | return this->rela_dyn_; |
| 3636 | } |
| 3637 | |
| 3638 | // Get the section to use for IRELATIVE relocs, creating it if |
| 3639 | // necessary. These go in .rela.dyn, but only after all other dynamic |
| 3640 | // relocations. They need to follow the other dynamic relocations so |
| 3641 | // that they can refer to global variables initialized by those |
| 3642 | // relocs. |
| 3643 | |
| 3644 | template<int size, bool big_endian> |
| 3645 | typename Target_aarch64<size, big_endian>::Reloc_section* |
| 3646 | Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout) |
| 3647 | { |
| 3648 | if (this->rela_irelative_ == NULL) |
| 3649 | { |
| 3650 | // Make sure we have already created the dynamic reloc section. |
| 3651 | this->rela_dyn_section(layout); |
| 3652 | this->rela_irelative_ = new Reloc_section(false); |
| 3653 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
| 3654 | elfcpp::SHF_ALLOC, this->rela_irelative_, |
| 3655 | ORDER_DYNAMIC_RELOCS, false); |
| 3656 | gold_assert(this->rela_dyn_->output_section() |
| 3657 | == this->rela_irelative_->output_section()); |
| 3658 | } |
| 3659 | return this->rela_irelative_; |
| 3660 | } |
| 3661 | |
| 3662 | |
| 3663 | // do_make_elf_object to override the same function in the base class. We need |
| 3664 | // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to |
| 3665 | // store backend specific information. Hence we need to have our own ELF object |
| 3666 | // creation. |
| 3667 | |
| 3668 | template<int size, bool big_endian> |
| 3669 | Object* |
| 3670 | Target_aarch64<size, big_endian>::do_make_elf_object( |
| 3671 | const std::string& name, |
| 3672 | Input_file* input_file, |
| 3673 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| 3674 | { |
| 3675 | int et = ehdr.get_e_type(); |
| 3676 | // ET_EXEC files are valid input for --just-symbols/-R, |
| 3677 | // and we treat them as relocatable objects. |
| 3678 | if (et == elfcpp::ET_EXEC && input_file->just_symbols()) |
| 3679 | return Sized_target<size, big_endian>::do_make_elf_object( |
| 3680 | name, input_file, offset, ehdr); |
| 3681 | else if (et == elfcpp::ET_REL) |
| 3682 | { |
| 3683 | AArch64_relobj<size, big_endian>* obj = |
| 3684 | new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| 3685 | obj->setup(); |
| 3686 | return obj; |
| 3687 | } |
| 3688 | else if (et == elfcpp::ET_DYN) |
| 3689 | { |
| 3690 | // Keep base implementation. |
| 3691 | Sized_dynobj<size, big_endian>* obj = |
| 3692 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); |
| 3693 | obj->setup(); |
| 3694 | return obj; |
| 3695 | } |
| 3696 | else |
| 3697 | { |
| 3698 | gold_error(_("%s: unsupported ELF file type %d"), |
| 3699 | name.c_str(), et); |
| 3700 | return NULL; |
| 3701 | } |
| 3702 | } |
| 3703 | |
| 3704 | |
| 3705 | // Scan a relocation for stub generation. |
| 3706 | |
| 3707 | template<int size, bool big_endian> |
| 3708 | void |
| 3709 | Target_aarch64<size, big_endian>::scan_reloc_for_stub( |
| 3710 | const Relocate_info<size, big_endian>* relinfo, |
| 3711 | unsigned int r_type, |
| 3712 | const Sized_symbol<size>* gsym, |
| 3713 | unsigned int r_sym, |
| 3714 | const Symbol_value<size>* psymval, |
| 3715 | typename elfcpp::Elf_types<size>::Elf_Swxword addend, |
| 3716 | Address address) |
| 3717 | { |
| 3718 | const AArch64_relobj<size, big_endian>* aarch64_relobj = |
| 3719 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); |
| 3720 | |
| 3721 | Symbol_value<size> symval; |
| 3722 | if (gsym != NULL) |
| 3723 | { |
| 3724 | const AArch64_reloc_property* arp = aarch64_reloc_property_table-> |
| 3725 | get_reloc_property(r_type); |
| 3726 | if (gsym->use_plt_offset(arp->reference_flags())) |
| 3727 | { |
| 3728 | // This uses a PLT, change the symbol value. |
| 3729 | symval.set_output_value(this->plt_section()->address() |
| 3730 | + gsym->plt_offset()); |
| 3731 | psymval = &symval; |
| 3732 | } |
| 3733 | else if (gsym->is_undefined()) |
| 3734 | // There is no need to generate a stub symbol is undefined. |
| 3735 | return; |
| 3736 | } |
| 3737 | |
| 3738 | // Get the symbol value. |
| 3739 | typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0); |
| 3740 | |
| 3741 | // Owing to pipelining, the PC relative branches below actually skip |
| 3742 | // two instructions when the branch offset is 0. |
| 3743 | Address destination = static_cast<Address>(-1); |
| 3744 | switch (r_type) |
| 3745 | { |
| 3746 | case elfcpp::R_AARCH64_CALL26: |
| 3747 | case elfcpp::R_AARCH64_JUMP26: |
| 3748 | destination = value + addend; |
| 3749 | break; |
| 3750 | default: |
| 3751 | gold_unreachable(); |
| 3752 | } |
| 3753 | |
| 3754 | int stub_type = The_reloc_stub:: |
| 3755 | stub_type_for_reloc(r_type, address, destination); |
| 3756 | if (stub_type == ST_NONE) |
| 3757 | return; |
| 3758 | |
| 3759 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); |
| 3760 | gold_assert(stub_table != NULL); |
| 3761 | |
| 3762 | The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend); |
| 3763 | The_reloc_stub* stub = stub_table->find_reloc_stub(key); |
| 3764 | if (stub == NULL) |
| 3765 | { |
| 3766 | stub = new The_reloc_stub(stub_type); |
| 3767 | stub_table->add_reloc_stub(stub, key); |
| 3768 | } |
| 3769 | stub->set_destination_address(destination); |
| 3770 | } // End of Target_aarch64::scan_reloc_for_stub |
| 3771 | |
| 3772 | |
| 3773 | // This function scans a relocation section for stub generation. |
| 3774 | // The template parameter Relocate must be a class type which provides |
| 3775 | // a single function, relocate(), which implements the machine |
| 3776 | // specific part of a relocation. |
| 3777 | |
| 3778 | // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type: |
| 3779 | // SHT_REL or SHT_RELA. |
| 3780 | |
| 3781 | // PRELOCS points to the relocation data. RELOC_COUNT is the number |
| 3782 | // of relocs. OUTPUT_SECTION is the output section. |
| 3783 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be |
| 3784 | // mapped to output offsets. |
| 3785 | |
| 3786 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and |
| 3787 | // VIEW_SIZE is the size. These refer to the input section, unless |
| 3788 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to |
| 3789 | // the output section. |
| 3790 | |
| 3791 | template<int size, bool big_endian> |
| 3792 | template<int sh_type> |
| 3793 | void inline |
| 3794 | Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs( |
| 3795 | const Relocate_info<size, big_endian>* relinfo, |
| 3796 | const unsigned char* prelocs, |
| 3797 | size_t reloc_count, |
| 3798 | Output_section* /*output_section*/, |
| 3799 | bool /*needs_special_offset_handling*/, |
| 3800 | const unsigned char* /*view*/, |
| 3801 | Address view_address, |
| 3802 | section_size_type) |
| 3803 | { |
| 3804 | typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype; |
| 3805 | |
| 3806 | const int reloc_size = |
| 3807 | Reloc_types<sh_type,size,big_endian>::reloc_size; |
| 3808 | AArch64_relobj<size, big_endian>* object = |
| 3809 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); |
| 3810 | unsigned int local_count = object->local_symbol_count(); |
| 3811 | |
| 3812 | gold::Default_comdat_behavior default_comdat_behavior; |
| 3813 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; |
| 3814 | |
| 3815 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) |
| 3816 | { |
| 3817 | Reltype reloc(prelocs); |
| 3818 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); |
| 3819 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); |
| 3820 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); |
| 3821 | if (r_type != elfcpp::R_AARCH64_CALL26 |
| 3822 | && r_type != elfcpp::R_AARCH64_JUMP26) |
| 3823 | continue; |
| 3824 | |
| 3825 | section_offset_type offset = |
| 3826 | convert_to_section_size_type(reloc.get_r_offset()); |
| 3827 | |
| 3828 | // Get the addend. |
| 3829 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = |
| 3830 | reloc.get_r_addend(); |
| 3831 | |
| 3832 | const Sized_symbol<size>* sym; |
| 3833 | Symbol_value<size> symval; |
| 3834 | const Symbol_value<size> *psymval; |
| 3835 | bool is_defined_in_discarded_section; |
| 3836 | unsigned int shndx; |
| 3837 | if (r_sym < local_count) |
| 3838 | { |
| 3839 | sym = NULL; |
| 3840 | psymval = object->local_symbol(r_sym); |
| 3841 | |
| 3842 | // If the local symbol belongs to a section we are discarding, |
| 3843 | // and that section is a debug section, try to find the |
| 3844 | // corresponding kept section and map this symbol to its |
| 3845 | // counterpart in the kept section. The symbol must not |
| 3846 | // correspond to a section we are folding. |
| 3847 | bool is_ordinary; |
| 3848 | shndx = psymval->input_shndx(&is_ordinary); |
| 3849 | is_defined_in_discarded_section = |
| 3850 | (is_ordinary |
| 3851 | && shndx != elfcpp::SHN_UNDEF |
| 3852 | && !object->is_section_included(shndx) |
| 3853 | && !relinfo->symtab->is_section_folded(object, shndx)); |
| 3854 | |
| 3855 | // We need to compute the would-be final value of this local |
| 3856 | // symbol. |
| 3857 | if (!is_defined_in_discarded_section) |
| 3858 | { |
| 3859 | typedef Sized_relobj_file<size, big_endian> ObjType; |
| 3860 | typename ObjType::Compute_final_local_value_status status = |
| 3861 | object->compute_final_local_value(r_sym, psymval, &symval, |
| 3862 | relinfo->symtab); |
| 3863 | if (status == ObjType::CFLV_OK) |
| 3864 | { |
| 3865 | // Currently we cannot handle a branch to a target in |
| 3866 | // a merged section. If this is the case, issue an error |
| 3867 | // and also free the merge symbol value. |
| 3868 | if (!symval.has_output_value()) |
| 3869 | { |
| 3870 | const std::string& section_name = |
| 3871 | object->section_name(shndx); |
| 3872 | object->error(_("cannot handle branch to local %u " |
| 3873 | "in a merged section %s"), |
| 3874 | r_sym, section_name.c_str()); |
| 3875 | } |
| 3876 | psymval = &symval; |
| 3877 | } |
| 3878 | else |
| 3879 | { |
| 3880 | // We cannot determine the final value. |
| 3881 | continue; |
| 3882 | } |
| 3883 | } |
| 3884 | } |
| 3885 | else |
| 3886 | { |
| 3887 | const Symbol* gsym; |
| 3888 | gsym = object->global_symbol(r_sym); |
| 3889 | gold_assert(gsym != NULL); |
| 3890 | if (gsym->is_forwarder()) |
| 3891 | gsym = relinfo->symtab->resolve_forwards(gsym); |
| 3892 | |
| 3893 | sym = static_cast<const Sized_symbol<size>*>(gsym); |
| 3894 | if (sym->has_symtab_index() && sym->symtab_index() != -1U) |
| 3895 | symval.set_output_symtab_index(sym->symtab_index()); |
| 3896 | else |
| 3897 | symval.set_no_output_symtab_entry(); |
| 3898 | |
| 3899 | // We need to compute the would-be final value of this global |
| 3900 | // symbol. |
| 3901 | const Symbol_table* symtab = relinfo->symtab; |
| 3902 | const Sized_symbol<size>* sized_symbol = |
| 3903 | symtab->get_sized_symbol<size>(gsym); |
| 3904 | Symbol_table::Compute_final_value_status status; |
| 3905 | typename elfcpp::Elf_types<size>::Elf_Addr value = |
| 3906 | symtab->compute_final_value<size>(sized_symbol, &status); |
| 3907 | |
| 3908 | // Skip this if the symbol has not output section. |
| 3909 | if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION) |
| 3910 | continue; |
| 3911 | symval.set_output_value(value); |
| 3912 | |
| 3913 | if (gsym->type() == elfcpp::STT_TLS) |
| 3914 | symval.set_is_tls_symbol(); |
| 3915 | else if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| 3916 | symval.set_is_ifunc_symbol(); |
| 3917 | psymval = &symval; |
| 3918 | |
| 3919 | is_defined_in_discarded_section = |
| 3920 | (gsym->is_defined_in_discarded_section() |
| 3921 | && gsym->is_undefined()); |
| 3922 | shndx = 0; |
| 3923 | } |
| 3924 | |
| 3925 | Symbol_value<size> symval2; |
| 3926 | if (is_defined_in_discarded_section) |
| 3927 | { |
| 3928 | if (comdat_behavior == CB_UNDETERMINED) |
| 3929 | { |
| 3930 | std::string name = object->section_name(relinfo->data_shndx); |
| 3931 | comdat_behavior = default_comdat_behavior.get(name.c_str()); |
| 3932 | } |
| 3933 | if (comdat_behavior == CB_PRETEND) |
| 3934 | { |
| 3935 | bool found; |
| 3936 | typename elfcpp::Elf_types<size>::Elf_Addr value = |
| 3937 | object->map_to_kept_section(shndx, &found); |
| 3938 | if (found) |
| 3939 | symval2.set_output_value(value + psymval->input_value()); |
| 3940 | else |
| 3941 | symval2.set_output_value(0); |
| 3942 | } |
| 3943 | else |
| 3944 | { |
| 3945 | if (comdat_behavior == CB_WARNING) |
| 3946 | gold_warning_at_location(relinfo, i, offset, |
| 3947 | _("relocation refers to discarded " |
| 3948 | "section")); |
| 3949 | symval2.set_output_value(0); |
| 3950 | } |
| 3951 | symval2.set_no_output_symtab_entry(); |
| 3952 | psymval = &symval2; |
| 3953 | } |
| 3954 | |
| 3955 | // If symbol is a section symbol, we don't know the actual type of |
| 3956 | // destination. Give up. |
| 3957 | if (psymval->is_section_symbol()) |
| 3958 | continue; |
| 3959 | |
| 3960 | this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval, |
| 3961 | addend, view_address + offset); |
| 3962 | } // End of iterating relocs in a section |
| 3963 | } // End of Target_aarch64::scan_reloc_section_for_stubs |
| 3964 | |
| 3965 | |
| 3966 | // Scan an input section for stub generation. |
| 3967 | |
| 3968 | template<int size, bool big_endian> |
| 3969 | void |
| 3970 | Target_aarch64<size, big_endian>::scan_section_for_stubs( |
| 3971 | const Relocate_info<size, big_endian>* relinfo, |
| 3972 | unsigned int sh_type, |
| 3973 | const unsigned char* prelocs, |
| 3974 | size_t reloc_count, |
| 3975 | Output_section* output_section, |
| 3976 | bool needs_special_offset_handling, |
| 3977 | const unsigned char* view, |
| 3978 | Address view_address, |
| 3979 | section_size_type view_size) |
| 3980 | { |
| 3981 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 3982 | this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>( |
| 3983 | relinfo, |
| 3984 | prelocs, |
| 3985 | reloc_count, |
| 3986 | output_section, |
| 3987 | needs_special_offset_handling, |
| 3988 | view, |
| 3989 | view_address, |
| 3990 | view_size); |
| 3991 | } |
| 3992 | |
| 3993 | |
| 3994 | // Relocate a single stub. |
| 3995 | |
| 3996 | template<int size, bool big_endian> |
| 3997 | void Target_aarch64<size, big_endian>:: |
| 3998 | relocate_stub(The_reloc_stub* stub, |
| 3999 | const The_relocate_info*, |
| 4000 | Output_section*, |
| 4001 | unsigned char* view, |
| 4002 | Address address, |
| 4003 | section_size_type) |
| 4004 | { |
| 4005 | typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions; |
| 4006 | typedef typename The_reloc_functions::Status The_reloc_functions_status; |
| 4007 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; |
| 4008 | |
| 4009 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 4010 | int insn_number = stub->insn_num(); |
| 4011 | const uint32_t* insns = stub->insns(); |
| 4012 | // Check the insns are really those stub insns. |
| 4013 | for (int i = 0; i < insn_number; ++i) |
| 4014 | { |
| 4015 | Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i); |
| 4016 | gold_assert(((uint32_t)insn == insns[i])); |
| 4017 | } |
| 4018 | |
| 4019 | Address dest = stub->destination_address(); |
| 4020 | |
| 4021 | switch(stub->type()) |
| 4022 | { |
| 4023 | case ST_ADRP_BRANCH: |
| 4024 | { |
| 4025 | // 1st reloc is ADR_PREL_PG_HI21 |
| 4026 | The_reloc_functions_status status = |
| 4027 | The_reloc_functions::adrp(view, dest, address); |
| 4028 | // An error should never arise in the above step. If so, please |
| 4029 | // check 'aarch64_valid_for_adrp_p'. |
| 4030 | gold_assert(status == The_reloc_functions::STATUS_OKAY); |
| 4031 | |
| 4032 | // 2nd reloc is ADD_ABS_LO12_NC |
| 4033 | const AArch64_reloc_property* arp = |
| 4034 | aarch64_reloc_property_table->get_reloc_property( |
| 4035 | elfcpp::R_AARCH64_ADD_ABS_LO12_NC); |
| 4036 | gold_assert(arp != NULL); |
| 4037 | status = The_reloc_functions::template |
| 4038 | rela_general<32>(view + 4, dest, 0, arp); |
| 4039 | // An error should never arise, it is an "_NC" relocation. |
| 4040 | gold_assert(status == The_reloc_functions::STATUS_OKAY); |
| 4041 | } |
| 4042 | break; |
| 4043 | |
| 4044 | case ST_LONG_BRANCH_ABS: |
| 4045 | // 1st reloc is R_AARCH64_PREL64, at offset 8 |
| 4046 | elfcpp::Swap<64,big_endian>::writeval(view + 8, dest); |
| 4047 | break; |
| 4048 | |
| 4049 | case ST_LONG_BRANCH_PCREL: |
| 4050 | { |
| 4051 | // "PC" calculation is the 2nd insn in the stub. |
| 4052 | uint64_t offset = dest - (address + 4); |
| 4053 | // Offset is placed at offset 4 and 5. |
| 4054 | elfcpp::Swap<64,big_endian>::writeval(view + 16, offset); |
| 4055 | } |
| 4056 | break; |
| 4057 | |
| 4058 | default: |
| 4059 | gold_unreachable(); |
| 4060 | } |
| 4061 | } |
| 4062 | |
| 4063 | |
| 4064 | // A class to handle the PLT data. |
| 4065 | // This is an abstract base class that handles most of the linker details |
| 4066 | // but does not know the actual contents of PLT entries. The derived |
| 4067 | // classes below fill in those details. |
| 4068 | |
| 4069 | template<int size, bool big_endian> |
| 4070 | class Output_data_plt_aarch64 : public Output_section_data |
| 4071 | { |
| 4072 | public: |
| 4073 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 4074 | Reloc_section; |
| 4075 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 4076 | |
| 4077 | Output_data_plt_aarch64(Layout* layout, |
| 4078 | uint64_t addralign, |
| 4079 | Output_data_got_aarch64<size, big_endian>* got, |
| 4080 | Output_data_space* got_plt, |
| 4081 | Output_data_space* got_irelative) |
| 4082 | : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL), |
| 4083 | got_(got), got_plt_(got_plt), got_irelative_(got_irelative), |
| 4084 | count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U) |
| 4085 | { this->init(layout); } |
| 4086 | |
| 4087 | // Initialize the PLT section. |
| 4088 | void |
| 4089 | init(Layout* layout); |
| 4090 | |
| 4091 | // Add an entry to the PLT. |
| 4092 | void |
| 4093 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
| 4094 | |
| 4095 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. |
| 4096 | unsigned int |
| 4097 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, |
| 4098 | Sized_relobj_file<size, big_endian>* relobj, |
| 4099 | unsigned int local_sym_index); |
| 4100 | |
| 4101 | // Add the relocation for a PLT entry. |
| 4102 | void |
| 4103 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, |
| 4104 | unsigned int got_offset); |
| 4105 | |
| 4106 | // Add the reserved TLSDESC_PLT entry to the PLT. |
| 4107 | void |
| 4108 | reserve_tlsdesc_entry(unsigned int got_offset) |
| 4109 | { this->tlsdesc_got_offset_ = got_offset; } |
| 4110 | |
| 4111 | // Return true if a TLSDESC_PLT entry has been reserved. |
| 4112 | bool |
| 4113 | has_tlsdesc_entry() const |
| 4114 | { return this->tlsdesc_got_offset_ != -1U; } |
| 4115 | |
| 4116 | // Return the GOT offset for the reserved TLSDESC_PLT entry. |
| 4117 | unsigned int |
| 4118 | get_tlsdesc_got_offset() const |
| 4119 | { return this->tlsdesc_got_offset_; } |
| 4120 | |
| 4121 | // Return the PLT offset of the reserved TLSDESC_PLT entry. |
| 4122 | unsigned int |
| 4123 | get_tlsdesc_plt_offset() const |
| 4124 | { |
| 4125 | return (this->first_plt_entry_offset() + |
| 4126 | (this->count_ + this->irelative_count_) |
| 4127 | * this->get_plt_entry_size()); |
| 4128 | } |
| 4129 | |
| 4130 | // Return the .rela.plt section data. |
| 4131 | Reloc_section* |
| 4132 | rela_plt() |
| 4133 | { return this->rel_; } |
| 4134 | |
| 4135 | // Return where the TLSDESC relocations should go. |
| 4136 | Reloc_section* |
| 4137 | rela_tlsdesc(Layout*); |
| 4138 | |
| 4139 | // Return where the IRELATIVE relocations should go in the PLT |
| 4140 | // relocations. |
| 4141 | Reloc_section* |
| 4142 | rela_irelative(Symbol_table*, Layout*); |
| 4143 | |
| 4144 | // Return whether we created a section for IRELATIVE relocations. |
| 4145 | bool |
| 4146 | has_irelative_section() const |
| 4147 | { return this->irelative_rel_ != NULL; } |
| 4148 | |
| 4149 | // Return the number of PLT entries. |
| 4150 | unsigned int |
| 4151 | entry_count() const |
| 4152 | { return this->count_ + this->irelative_count_; } |
| 4153 | |
| 4154 | // Return the offset of the first non-reserved PLT entry. |
| 4155 | unsigned int |
| 4156 | first_plt_entry_offset() const |
| 4157 | { return this->do_first_plt_entry_offset(); } |
| 4158 | |
| 4159 | // Return the size of a PLT entry. |
| 4160 | unsigned int |
| 4161 | get_plt_entry_size() const |
| 4162 | { return this->do_get_plt_entry_size(); } |
| 4163 | |
| 4164 | // Return the reserved tlsdesc entry size. |
| 4165 | unsigned int |
| 4166 | get_plt_tlsdesc_entry_size() const |
| 4167 | { return this->do_get_plt_tlsdesc_entry_size(); } |
| 4168 | |
| 4169 | // Return the PLT address to use for a global symbol. |
| 4170 | uint64_t |
| 4171 | address_for_global(const Symbol*); |
| 4172 | |
| 4173 | // Return the PLT address to use for a local symbol. |
| 4174 | uint64_t |
| 4175 | address_for_local(const Relobj*, unsigned int symndx); |
| 4176 | |
| 4177 | protected: |
| 4178 | // Fill in the first PLT entry. |
| 4179 | void |
| 4180 | fill_first_plt_entry(unsigned char* pov, |
| 4181 | Address got_address, |
| 4182 | Address plt_address) |
| 4183 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } |
| 4184 | |
| 4185 | // Fill in a normal PLT entry. |
| 4186 | void |
| 4187 | fill_plt_entry(unsigned char* pov, |
| 4188 | Address got_address, |
| 4189 | Address plt_address, |
| 4190 | unsigned int got_offset, |
| 4191 | unsigned int plt_offset) |
| 4192 | { |
| 4193 | this->do_fill_plt_entry(pov, got_address, plt_address, |
| 4194 | got_offset, plt_offset); |
| 4195 | } |
| 4196 | |
| 4197 | // Fill in the reserved TLSDESC PLT entry. |
| 4198 | void |
| 4199 | fill_tlsdesc_entry(unsigned char* pov, |
| 4200 | Address gotplt_address, |
| 4201 | Address plt_address, |
| 4202 | Address got_base, |
| 4203 | unsigned int tlsdesc_got_offset, |
| 4204 | unsigned int plt_offset) |
| 4205 | { |
| 4206 | this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, |
| 4207 | tlsdesc_got_offset, plt_offset); |
| 4208 | } |
| 4209 | |
| 4210 | virtual unsigned int |
| 4211 | do_first_plt_entry_offset() const = 0; |
| 4212 | |
| 4213 | virtual unsigned int |
| 4214 | do_get_plt_entry_size() const = 0; |
| 4215 | |
| 4216 | virtual unsigned int |
| 4217 | do_get_plt_tlsdesc_entry_size() const = 0; |
| 4218 | |
| 4219 | virtual void |
| 4220 | do_fill_first_plt_entry(unsigned char* pov, |
| 4221 | Address got_addr, |
| 4222 | Address plt_addr) = 0; |
| 4223 | |
| 4224 | virtual void |
| 4225 | do_fill_plt_entry(unsigned char* pov, |
| 4226 | Address got_address, |
| 4227 | Address plt_address, |
| 4228 | unsigned int got_offset, |
| 4229 | unsigned int plt_offset) = 0; |
| 4230 | |
| 4231 | virtual void |
| 4232 | do_fill_tlsdesc_entry(unsigned char* pov, |
| 4233 | Address gotplt_address, |
| 4234 | Address plt_address, |
| 4235 | Address got_base, |
| 4236 | unsigned int tlsdesc_got_offset, |
| 4237 | unsigned int plt_offset) = 0; |
| 4238 | |
| 4239 | void |
| 4240 | do_adjust_output_section(Output_section* os); |
| 4241 | |
| 4242 | // Write to a map file. |
| 4243 | void |
| 4244 | do_print_to_mapfile(Mapfile* mapfile) const |
| 4245 | { mapfile->print_output_data(this, _("** PLT")); } |
| 4246 | |
| 4247 | private: |
| 4248 | // Set the final size. |
| 4249 | void |
| 4250 | set_final_data_size(); |
| 4251 | |
| 4252 | // Write out the PLT data. |
| 4253 | void |
| 4254 | do_write(Output_file*); |
| 4255 | |
| 4256 | // The reloc section. |
| 4257 | Reloc_section* rel_; |
| 4258 | |
| 4259 | // The TLSDESC relocs, if necessary. These must follow the regular |
| 4260 | // PLT relocs. |
| 4261 | Reloc_section* tlsdesc_rel_; |
| 4262 | |
| 4263 | // The IRELATIVE relocs, if necessary. These must follow the |
| 4264 | // regular PLT relocations. |
| 4265 | Reloc_section* irelative_rel_; |
| 4266 | |
| 4267 | // The .got section. |
| 4268 | Output_data_got_aarch64<size, big_endian>* got_; |
| 4269 | |
| 4270 | // The .got.plt section. |
| 4271 | Output_data_space* got_plt_; |
| 4272 | |
| 4273 | // The part of the .got.plt section used for IRELATIVE relocs. |
| 4274 | Output_data_space* got_irelative_; |
| 4275 | |
| 4276 | // The number of PLT entries. |
| 4277 | unsigned int count_; |
| 4278 | |
| 4279 | // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These |
| 4280 | // follow the regular PLT entries. |
| 4281 | unsigned int irelative_count_; |
| 4282 | |
| 4283 | // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline. |
| 4284 | // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1 |
| 4285 | // indicates an offset is not allocated. |
| 4286 | unsigned int tlsdesc_got_offset_; |
| 4287 | }; |
| 4288 | |
| 4289 | // Initialize the PLT section. |
| 4290 | |
| 4291 | template<int size, bool big_endian> |
| 4292 | void |
| 4293 | Output_data_plt_aarch64<size, big_endian>::init(Layout* layout) |
| 4294 | { |
| 4295 | this->rel_ = new Reloc_section(false); |
| 4296 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 4297 | elfcpp::SHF_ALLOC, this->rel_, |
| 4298 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 4299 | } |
| 4300 | |
| 4301 | template<int size, bool big_endian> |
| 4302 | void |
| 4303 | Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section( |
| 4304 | Output_section* os) |
| 4305 | { |
| 4306 | os->set_entsize(this->get_plt_entry_size()); |
| 4307 | } |
| 4308 | |
| 4309 | // Add an entry to the PLT. |
| 4310 | |
| 4311 | template<int size, bool big_endian> |
| 4312 | void |
| 4313 | Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab, |
| 4314 | Layout* layout, Symbol* gsym) |
| 4315 | { |
| 4316 | gold_assert(!gsym->has_plt_offset()); |
| 4317 | |
| 4318 | unsigned int* pcount; |
| 4319 | unsigned int plt_reserved; |
| 4320 | Output_section_data_build* got; |
| 4321 | |
| 4322 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 4323 | && gsym->can_use_relative_reloc(false)) |
| 4324 | { |
| 4325 | pcount = &this->irelative_count_; |
| 4326 | plt_reserved = 0; |
| 4327 | got = this->got_irelative_; |
| 4328 | } |
| 4329 | else |
| 4330 | { |
| 4331 | pcount = &this->count_; |
| 4332 | plt_reserved = this->first_plt_entry_offset(); |
| 4333 | got = this->got_plt_; |
| 4334 | } |
| 4335 | |
| 4336 | gsym->set_plt_offset((*pcount) * this->get_plt_entry_size() |
| 4337 | + plt_reserved); |
| 4338 | |
| 4339 | ++*pcount; |
| 4340 | |
| 4341 | section_offset_type got_offset = got->current_data_size(); |
| 4342 | |
| 4343 | // Every PLT entry needs a GOT entry which points back to the PLT |
| 4344 | // entry (this will be changed by the dynamic linker, normally |
| 4345 | // lazily when the function is called). |
| 4346 | got->set_current_data_size(got_offset + size / 8); |
| 4347 | |
| 4348 | // Every PLT entry needs a reloc. |
| 4349 | this->add_relocation(symtab, layout, gsym, got_offset); |
| 4350 | |
| 4351 | // Note that we don't need to save the symbol. The contents of the |
| 4352 | // PLT are independent of which symbols are used. The symbols only |
| 4353 | // appear in the relocations. |
| 4354 | } |
| 4355 | |
| 4356 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
| 4357 | // the PLT offset. |
| 4358 | |
| 4359 | template<int size, bool big_endian> |
| 4360 | unsigned int |
| 4361 | Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry( |
| 4362 | Symbol_table* symtab, |
| 4363 | Layout* layout, |
| 4364 | Sized_relobj_file<size, big_endian>* relobj, |
| 4365 | unsigned int local_sym_index) |
| 4366 | { |
| 4367 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
| 4368 | ++this->irelative_count_; |
| 4369 | |
| 4370 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
| 4371 | |
| 4372 | // Every PLT entry needs a GOT entry which points back to the PLT |
| 4373 | // entry. |
| 4374 | this->got_irelative_->set_current_data_size(got_offset + size / 8); |
| 4375 | |
| 4376 | // Every PLT entry needs a reloc. |
| 4377 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
| 4378 | rela->add_symbolless_local_addend(relobj, local_sym_index, |
| 4379 | elfcpp::R_AARCH64_IRELATIVE, |
| 4380 | this->got_irelative_, got_offset, 0); |
| 4381 | |
| 4382 | return plt_offset; |
| 4383 | } |
| 4384 | |
| 4385 | // Add the relocation for a PLT entry. |
| 4386 | |
| 4387 | template<int size, bool big_endian> |
| 4388 | void |
| 4389 | Output_data_plt_aarch64<size, big_endian>::add_relocation( |
| 4390 | Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset) |
| 4391 | { |
| 4392 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 4393 | && gsym->can_use_relative_reloc(false)) |
| 4394 | { |
| 4395 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
| 4396 | rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE, |
| 4397 | this->got_irelative_, got_offset, 0); |
| 4398 | } |
| 4399 | else |
| 4400 | { |
| 4401 | gsym->set_needs_dynsym_entry(); |
| 4402 | this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_, |
| 4403 | got_offset, 0); |
| 4404 | } |
| 4405 | } |
| 4406 | |
| 4407 | // Return where the TLSDESC relocations should go, creating it if |
| 4408 | // necessary. These follow the JUMP_SLOT relocations. |
| 4409 | |
| 4410 | template<int size, bool big_endian> |
| 4411 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* |
| 4412 | Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout) |
| 4413 | { |
| 4414 | if (this->tlsdesc_rel_ == NULL) |
| 4415 | { |
| 4416 | this->tlsdesc_rel_ = new Reloc_section(false); |
| 4417 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 4418 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, |
| 4419 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 4420 | gold_assert(this->tlsdesc_rel_->output_section() |
| 4421 | == this->rel_->output_section()); |
| 4422 | } |
| 4423 | return this->tlsdesc_rel_; |
| 4424 | } |
| 4425 | |
| 4426 | // Return where the IRELATIVE relocations should go in the PLT. These |
| 4427 | // follow the JUMP_SLOT and the TLSDESC relocations. |
| 4428 | |
| 4429 | template<int size, bool big_endian> |
| 4430 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* |
| 4431 | Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab, |
| 4432 | Layout* layout) |
| 4433 | { |
| 4434 | if (this->irelative_rel_ == NULL) |
| 4435 | { |
| 4436 | // Make sure we have a place for the TLSDESC relocations, in |
| 4437 | // case we see any later on. |
| 4438 | this->rela_tlsdesc(layout); |
| 4439 | this->irelative_rel_ = new Reloc_section(false); |
| 4440 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
| 4441 | elfcpp::SHF_ALLOC, this->irelative_rel_, |
| 4442 | ORDER_DYNAMIC_PLT_RELOCS, false); |
| 4443 | gold_assert(this->irelative_rel_->output_section() |
| 4444 | == this->rel_->output_section()); |
| 4445 | |
| 4446 | if (parameters->doing_static_link()) |
| 4447 | { |
| 4448 | // A statically linked executable will only have a .rela.plt |
| 4449 | // section to hold R_AARCH64_IRELATIVE relocs for |
| 4450 | // STT_GNU_IFUNC symbols. The library will use these |
| 4451 | // symbols to locate the IRELATIVE relocs at program startup |
| 4452 | // time. |
| 4453 | symtab->define_in_output_data("__rela_iplt_start", NULL, |
| 4454 | Symbol_table::PREDEFINED, |
| 4455 | this->irelative_rel_, 0, 0, |
| 4456 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 4457 | elfcpp::STV_HIDDEN, 0, false, true); |
| 4458 | symtab->define_in_output_data("__rela_iplt_end", NULL, |
| 4459 | Symbol_table::PREDEFINED, |
| 4460 | this->irelative_rel_, 0, 0, |
| 4461 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, |
| 4462 | elfcpp::STV_HIDDEN, 0, true, true); |
| 4463 | } |
| 4464 | } |
| 4465 | return this->irelative_rel_; |
| 4466 | } |
| 4467 | |
| 4468 | // Return the PLT address to use for a global symbol. |
| 4469 | |
| 4470 | template<int size, bool big_endian> |
| 4471 | uint64_t |
| 4472 | Output_data_plt_aarch64<size, big_endian>::address_for_global( |
| 4473 | const Symbol* gsym) |
| 4474 | { |
| 4475 | uint64_t offset = 0; |
| 4476 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 4477 | && gsym->can_use_relative_reloc(false)) |
| 4478 | offset = (this->first_plt_entry_offset() + |
| 4479 | this->count_ * this->get_plt_entry_size()); |
| 4480 | return this->address() + offset + gsym->plt_offset(); |
| 4481 | } |
| 4482 | |
| 4483 | // Return the PLT address to use for a local symbol. These are always |
| 4484 | // IRELATIVE relocs. |
| 4485 | |
| 4486 | template<int size, bool big_endian> |
| 4487 | uint64_t |
| 4488 | Output_data_plt_aarch64<size, big_endian>::address_for_local( |
| 4489 | const Relobj* object, |
| 4490 | unsigned int r_sym) |
| 4491 | { |
| 4492 | return (this->address() |
| 4493 | + this->first_plt_entry_offset() |
| 4494 | + this->count_ * this->get_plt_entry_size() |
| 4495 | + object->local_plt_offset(r_sym)); |
| 4496 | } |
| 4497 | |
| 4498 | // Set the final size. |
| 4499 | |
| 4500 | template<int size, bool big_endian> |
| 4501 | void |
| 4502 | Output_data_plt_aarch64<size, big_endian>::set_final_data_size() |
| 4503 | { |
| 4504 | unsigned int count = this->count_ + this->irelative_count_; |
| 4505 | unsigned int extra_size = 0; |
| 4506 | if (this->has_tlsdesc_entry()) |
| 4507 | extra_size += this->get_plt_tlsdesc_entry_size(); |
| 4508 | this->set_data_size(this->first_plt_entry_offset() |
| 4509 | + count * this->get_plt_entry_size() |
| 4510 | + extra_size); |
| 4511 | } |
| 4512 | |
| 4513 | template<int size, bool big_endian> |
| 4514 | class Output_data_plt_aarch64_standard : |
| 4515 | public Output_data_plt_aarch64<size, big_endian> |
| 4516 | { |
| 4517 | public: |
| 4518 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 4519 | Output_data_plt_aarch64_standard( |
| 4520 | Layout* layout, |
| 4521 | Output_data_got_aarch64<size, big_endian>* got, |
| 4522 | Output_data_space* got_plt, |
| 4523 | Output_data_space* got_irelative) |
| 4524 | : Output_data_plt_aarch64<size, big_endian>(layout, |
| 4525 | size == 32 ? 4 : 8, |
| 4526 | got, got_plt, |
| 4527 | got_irelative) |
| 4528 | { } |
| 4529 | |
| 4530 | protected: |
| 4531 | // Return the offset of the first non-reserved PLT entry. |
| 4532 | virtual unsigned int |
| 4533 | do_first_plt_entry_offset() const |
| 4534 | { return this->first_plt_entry_size; } |
| 4535 | |
| 4536 | // Return the size of a PLT entry |
| 4537 | virtual unsigned int |
| 4538 | do_get_plt_entry_size() const |
| 4539 | { return this->plt_entry_size; } |
| 4540 | |
| 4541 | // Return the size of a tlsdesc entry |
| 4542 | virtual unsigned int |
| 4543 | do_get_plt_tlsdesc_entry_size() const |
| 4544 | { return this->plt_tlsdesc_entry_size; } |
| 4545 | |
| 4546 | virtual void |
| 4547 | do_fill_first_plt_entry(unsigned char* pov, |
| 4548 | Address got_address, |
| 4549 | Address plt_address); |
| 4550 | |
| 4551 | virtual void |
| 4552 | do_fill_plt_entry(unsigned char* pov, |
| 4553 | Address got_address, |
| 4554 | Address plt_address, |
| 4555 | unsigned int got_offset, |
| 4556 | unsigned int plt_offset); |
| 4557 | |
| 4558 | virtual void |
| 4559 | do_fill_tlsdesc_entry(unsigned char* pov, |
| 4560 | Address gotplt_address, |
| 4561 | Address plt_address, |
| 4562 | Address got_base, |
| 4563 | unsigned int tlsdesc_got_offset, |
| 4564 | unsigned int plt_offset); |
| 4565 | |
| 4566 | private: |
| 4567 | // The size of the first plt entry size. |
| 4568 | static const int first_plt_entry_size = 32; |
| 4569 | // The size of the plt entry size. |
| 4570 | static const int plt_entry_size = 16; |
| 4571 | // The size of the plt tlsdesc entry size. |
| 4572 | static const int plt_tlsdesc_entry_size = 32; |
| 4573 | // Template for the first PLT entry. |
| 4574 | static const uint32_t first_plt_entry[first_plt_entry_size / 4]; |
| 4575 | // Template for subsequent PLT entries. |
| 4576 | static const uint32_t plt_entry[plt_entry_size / 4]; |
| 4577 | // The reserved TLSDESC entry in the PLT for an executable. |
| 4578 | static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4]; |
| 4579 | }; |
| 4580 | |
| 4581 | // The first entry in the PLT for an executable. |
| 4582 | |
| 4583 | template<> |
| 4584 | const uint32_t |
| 4585 | Output_data_plt_aarch64_standard<32, false>:: |
| 4586 | first_plt_entry[first_plt_entry_size / 4] = |
| 4587 | { |
| 4588 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 4589 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ |
| 4590 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ |
| 4591 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ |
| 4592 | 0xd61f0220, /* br x17 */ |
| 4593 | 0xd503201f, /* nop */ |
| 4594 | 0xd503201f, /* nop */ |
| 4595 | 0xd503201f, /* nop */ |
| 4596 | }; |
| 4597 | |
| 4598 | |
| 4599 | template<> |
| 4600 | const uint32_t |
| 4601 | Output_data_plt_aarch64_standard<32, true>:: |
| 4602 | first_plt_entry[first_plt_entry_size / 4] = |
| 4603 | { |
| 4604 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 4605 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ |
| 4606 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ |
| 4607 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ |
| 4608 | 0xd61f0220, /* br x17 */ |
| 4609 | 0xd503201f, /* nop */ |
| 4610 | 0xd503201f, /* nop */ |
| 4611 | 0xd503201f, /* nop */ |
| 4612 | }; |
| 4613 | |
| 4614 | |
| 4615 | template<> |
| 4616 | const uint32_t |
| 4617 | Output_data_plt_aarch64_standard<64, false>:: |
| 4618 | first_plt_entry[first_plt_entry_size / 4] = |
| 4619 | { |
| 4620 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 4621 | 0x90000010, /* adrp x16, PLT_GOT+16 */ |
| 4622 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ |
| 4623 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ |
| 4624 | 0xd61f0220, /* br x17 */ |
| 4625 | 0xd503201f, /* nop */ |
| 4626 | 0xd503201f, /* nop */ |
| 4627 | 0xd503201f, /* nop */ |
| 4628 | }; |
| 4629 | |
| 4630 | |
| 4631 | template<> |
| 4632 | const uint32_t |
| 4633 | Output_data_plt_aarch64_standard<64, true>:: |
| 4634 | first_plt_entry[first_plt_entry_size / 4] = |
| 4635 | { |
| 4636 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ |
| 4637 | 0x90000010, /* adrp x16, PLT_GOT+16 */ |
| 4638 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ |
| 4639 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ |
| 4640 | 0xd61f0220, /* br x17 */ |
| 4641 | 0xd503201f, /* nop */ |
| 4642 | 0xd503201f, /* nop */ |
| 4643 | 0xd503201f, /* nop */ |
| 4644 | }; |
| 4645 | |
| 4646 | |
| 4647 | template<> |
| 4648 | const uint32_t |
| 4649 | Output_data_plt_aarch64_standard<32, false>:: |
| 4650 | plt_entry[plt_entry_size / 4] = |
| 4651 | { |
| 4652 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ |
| 4653 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ |
| 4654 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ |
| 4655 | 0xd61f0220, /* br x17. */ |
| 4656 | }; |
| 4657 | |
| 4658 | |
| 4659 | template<> |
| 4660 | const uint32_t |
| 4661 | Output_data_plt_aarch64_standard<32, true>:: |
| 4662 | plt_entry[plt_entry_size / 4] = |
| 4663 | { |
| 4664 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ |
| 4665 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ |
| 4666 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ |
| 4667 | 0xd61f0220, /* br x17. */ |
| 4668 | }; |
| 4669 | |
| 4670 | |
| 4671 | template<> |
| 4672 | const uint32_t |
| 4673 | Output_data_plt_aarch64_standard<64, false>:: |
| 4674 | plt_entry[plt_entry_size / 4] = |
| 4675 | { |
| 4676 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ |
| 4677 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ |
| 4678 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ |
| 4679 | 0xd61f0220, /* br x17. */ |
| 4680 | }; |
| 4681 | |
| 4682 | |
| 4683 | template<> |
| 4684 | const uint32_t |
| 4685 | Output_data_plt_aarch64_standard<64, true>:: |
| 4686 | plt_entry[plt_entry_size / 4] = |
| 4687 | { |
| 4688 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ |
| 4689 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ |
| 4690 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ |
| 4691 | 0xd61f0220, /* br x17. */ |
| 4692 | }; |
| 4693 | |
| 4694 | |
| 4695 | template<int size, bool big_endian> |
| 4696 | void |
| 4697 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry( |
| 4698 | unsigned char* pov, |
| 4699 | Address got_address, |
| 4700 | Address plt_address) |
| 4701 | { |
| 4702 | // PLT0 of the small PLT looks like this in ELF64 - |
| 4703 | // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack. |
| 4704 | // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT |
| 4705 | // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the |
| 4706 | // symbol resolver |
| 4707 | // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the |
| 4708 | // GOTPLT entry for this. |
| 4709 | // br x17 |
| 4710 | // PLT0 will be slightly different in ELF32 due to different got entry |
| 4711 | // size. |
| 4712 | memcpy(pov, this->first_plt_entry, this->first_plt_entry_size); |
| 4713 | Address gotplt_2nd_ent = got_address + (size / 8) * 2; |
| 4714 | |
| 4715 | // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2. |
| 4716 | // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff. |
| 4717 | // FIXME: This only works for 64bit |
| 4718 | AArch64_relocate_functions<size, big_endian>::adrp(pov + 4, |
| 4719 | gotplt_2nd_ent, plt_address + 4); |
| 4720 | |
| 4721 | // Fill in R_AARCH64_LDST8_LO12 |
| 4722 | elfcpp::Swap<32, big_endian>::writeval( |
| 4723 | pov + 8, |
| 4724 | ((this->first_plt_entry[2] & 0xffc003ff) |
| 4725 | | ((gotplt_2nd_ent & 0xff8) << 7))); |
| 4726 | |
| 4727 | // Fill in R_AARCH64_ADD_ABS_LO12 |
| 4728 | elfcpp::Swap<32, big_endian>::writeval( |
| 4729 | pov + 12, |
| 4730 | ((this->first_plt_entry[3] & 0xffc003ff) |
| 4731 | | ((gotplt_2nd_ent & 0xfff) << 10))); |
| 4732 | } |
| 4733 | |
| 4734 | |
| 4735 | // Subsequent entries in the PLT for an executable. |
| 4736 | // FIXME: This only works for 64bit |
| 4737 | |
| 4738 | template<int size, bool big_endian> |
| 4739 | void |
| 4740 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry( |
| 4741 | unsigned char* pov, |
| 4742 | Address got_address, |
| 4743 | Address plt_address, |
| 4744 | unsigned int got_offset, |
| 4745 | unsigned int plt_offset) |
| 4746 | { |
| 4747 | memcpy(pov, this->plt_entry, this->plt_entry_size); |
| 4748 | |
| 4749 | Address gotplt_entry_address = got_address + got_offset; |
| 4750 | Address plt_entry_address = plt_address + plt_offset; |
| 4751 | |
| 4752 | // Fill in R_AARCH64_PCREL_ADR_HI21 |
| 4753 | AArch64_relocate_functions<size, big_endian>::adrp( |
| 4754 | pov, |
| 4755 | gotplt_entry_address, |
| 4756 | plt_entry_address); |
| 4757 | |
| 4758 | // Fill in R_AARCH64_LDST64_ABS_LO12 |
| 4759 | elfcpp::Swap<32, big_endian>::writeval( |
| 4760 | pov + 4, |
| 4761 | ((this->plt_entry[1] & 0xffc003ff) |
| 4762 | | ((gotplt_entry_address & 0xff8) << 7))); |
| 4763 | |
| 4764 | // Fill in R_AARCH64_ADD_ABS_LO12 |
| 4765 | elfcpp::Swap<32, big_endian>::writeval( |
| 4766 | pov + 8, |
| 4767 | ((this->plt_entry[2] & 0xffc003ff) |
| 4768 | | ((gotplt_entry_address & 0xfff) <<10))); |
| 4769 | |
| 4770 | } |
| 4771 | |
| 4772 | |
| 4773 | template<> |
| 4774 | const uint32_t |
| 4775 | Output_data_plt_aarch64_standard<32, false>:: |
| 4776 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 4777 | { |
| 4778 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 4779 | 0x90000002, /* adrp x2, 0 */ |
| 4780 | 0x90000003, /* adrp x3, 0 */ |
| 4781 | 0xb9400042, /* ldr w2, [w2, #0] */ |
| 4782 | 0x11000063, /* add w3, w3, 0 */ |
| 4783 | 0xd61f0040, /* br x2 */ |
| 4784 | 0xd503201f, /* nop */ |
| 4785 | 0xd503201f, /* nop */ |
| 4786 | }; |
| 4787 | |
| 4788 | template<> |
| 4789 | const uint32_t |
| 4790 | Output_data_plt_aarch64_standard<32, true>:: |
| 4791 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 4792 | { |
| 4793 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 4794 | 0x90000002, /* adrp x2, 0 */ |
| 4795 | 0x90000003, /* adrp x3, 0 */ |
| 4796 | 0xb9400042, /* ldr w2, [w2, #0] */ |
| 4797 | 0x11000063, /* add w3, w3, 0 */ |
| 4798 | 0xd61f0040, /* br x2 */ |
| 4799 | 0xd503201f, /* nop */ |
| 4800 | 0xd503201f, /* nop */ |
| 4801 | }; |
| 4802 | |
| 4803 | template<> |
| 4804 | const uint32_t |
| 4805 | Output_data_plt_aarch64_standard<64, false>:: |
| 4806 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 4807 | { |
| 4808 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 4809 | 0x90000002, /* adrp x2, 0 */ |
| 4810 | 0x90000003, /* adrp x3, 0 */ |
| 4811 | 0xf9400042, /* ldr x2, [x2, #0] */ |
| 4812 | 0x91000063, /* add x3, x3, 0 */ |
| 4813 | 0xd61f0040, /* br x2 */ |
| 4814 | 0xd503201f, /* nop */ |
| 4815 | 0xd503201f, /* nop */ |
| 4816 | }; |
| 4817 | |
| 4818 | template<> |
| 4819 | const uint32_t |
| 4820 | Output_data_plt_aarch64_standard<64, true>:: |
| 4821 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = |
| 4822 | { |
| 4823 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ |
| 4824 | 0x90000002, /* adrp x2, 0 */ |
| 4825 | 0x90000003, /* adrp x3, 0 */ |
| 4826 | 0xf9400042, /* ldr x2, [x2, #0] */ |
| 4827 | 0x91000063, /* add x3, x3, 0 */ |
| 4828 | 0xd61f0040, /* br x2 */ |
| 4829 | 0xd503201f, /* nop */ |
| 4830 | 0xd503201f, /* nop */ |
| 4831 | }; |
| 4832 | |
| 4833 | template<int size, bool big_endian> |
| 4834 | void |
| 4835 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry( |
| 4836 | unsigned char* pov, |
| 4837 | Address gotplt_address, |
| 4838 | Address plt_address, |
| 4839 | Address got_base, |
| 4840 | unsigned int tlsdesc_got_offset, |
| 4841 | unsigned int plt_offset) |
| 4842 | { |
| 4843 | memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size); |
| 4844 | |
| 4845 | // move DT_TLSDESC_GOT address into x2 |
| 4846 | // move .got.plt address into x3 |
| 4847 | Address tlsdesc_got_entry = got_base + tlsdesc_got_offset; |
| 4848 | Address plt_entry_address = plt_address + plt_offset; |
| 4849 | |
| 4850 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 4851 | AArch64_relocate_functions<size, big_endian>::adrp( |
| 4852 | pov + 4, |
| 4853 | tlsdesc_got_entry, |
| 4854 | plt_entry_address + 4); |
| 4855 | |
| 4856 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 4857 | AArch64_relocate_functions<size, big_endian>::adrp( |
| 4858 | pov + 8, |
| 4859 | gotplt_address, |
| 4860 | plt_entry_address + 8); |
| 4861 | |
| 4862 | // R_AARCH64_LDST64_ABS_LO12 |
| 4863 | elfcpp::Swap<32, big_endian>::writeval( |
| 4864 | pov + 12, |
| 4865 | ((this->tlsdesc_plt_entry[3] & 0xffc003ff) |
| 4866 | | ((tlsdesc_got_entry & 0xff8) << 7))); |
| 4867 | |
| 4868 | // R_AARCH64_ADD_ABS_LO12 |
| 4869 | elfcpp::Swap<32, big_endian>::writeval( |
| 4870 | pov + 16, |
| 4871 | ((this->tlsdesc_plt_entry[4] & 0xffc003ff) |
| 4872 | | ((gotplt_address & 0xfff) << 10))); |
| 4873 | } |
| 4874 | |
| 4875 | // Write out the PLT. This uses the hand-coded instructions above, |
| 4876 | // and adjusts them as needed. This is specified by the AMD64 ABI. |
| 4877 | |
| 4878 | template<int size, bool big_endian> |
| 4879 | void |
| 4880 | Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of) |
| 4881 | { |
| 4882 | const off_t offset = this->offset(); |
| 4883 | const section_size_type oview_size = |
| 4884 | convert_to_section_size_type(this->data_size()); |
| 4885 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
| 4886 | |
| 4887 | const off_t got_file_offset = this->got_plt_->offset(); |
| 4888 | gold_assert(got_file_offset + this->got_plt_->data_size() |
| 4889 | == this->got_irelative_->offset()); |
| 4890 | |
| 4891 | const section_size_type got_size = |
| 4892 | convert_to_section_size_type(this->got_plt_->data_size() |
| 4893 | + this->got_irelative_->data_size()); |
| 4894 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
| 4895 | got_size); |
| 4896 | |
| 4897 | unsigned char* pov = oview; |
| 4898 | |
| 4899 | // The base address of the .plt section. |
| 4900 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
| 4901 | // The base address of the PLT portion of the .got section. |
| 4902 | typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address |
| 4903 | = this->got_plt_->address(); |
| 4904 | |
| 4905 | this->fill_first_plt_entry(pov, gotplt_address, plt_address); |
| 4906 | pov += this->first_plt_entry_offset(); |
| 4907 | |
| 4908 | // The first three entries in .got.plt are reserved. |
| 4909 | unsigned char* got_pov = got_view; |
| 4910 | memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT); |
| 4911 | got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; |
| 4912 | |
| 4913 | unsigned int plt_offset = this->first_plt_entry_offset(); |
| 4914 | unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; |
| 4915 | const unsigned int count = this->count_ + this->irelative_count_; |
| 4916 | for (unsigned int plt_index = 0; |
| 4917 | plt_index < count; |
| 4918 | ++plt_index, |
| 4919 | pov += this->get_plt_entry_size(), |
| 4920 | got_pov += size / 8, |
| 4921 | plt_offset += this->get_plt_entry_size(), |
| 4922 | got_offset += size / 8) |
| 4923 | { |
| 4924 | // Set and adjust the PLT entry itself. |
| 4925 | this->fill_plt_entry(pov, gotplt_address, plt_address, |
| 4926 | got_offset, plt_offset); |
| 4927 | |
| 4928 | // Set the entry in the GOT, which points to plt0. |
| 4929 | elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address); |
| 4930 | } |
| 4931 | |
| 4932 | if (this->has_tlsdesc_entry()) |
| 4933 | { |
| 4934 | // Set and adjust the reserved TLSDESC PLT entry. |
| 4935 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); |
| 4936 | // The base address of the .base section. |
| 4937 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = |
| 4938 | this->got_->address(); |
| 4939 | this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, |
| 4940 | tlsdesc_got_offset, plt_offset); |
| 4941 | pov += this->get_plt_tlsdesc_entry_size(); |
| 4942 | } |
| 4943 | |
| 4944 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
| 4945 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); |
| 4946 | |
| 4947 | of->write_output_view(offset, oview_size, oview); |
| 4948 | of->write_output_view(got_file_offset, got_size, got_view); |
| 4949 | } |
| 4950 | |
| 4951 | // Telling how to update the immediate field of an instruction. |
| 4952 | struct AArch64_howto |
| 4953 | { |
| 4954 | // The immediate field mask. |
| 4955 | elfcpp::Elf_Xword dst_mask; |
| 4956 | |
| 4957 | // The offset to apply relocation immediate |
| 4958 | int doffset; |
| 4959 | |
| 4960 | // The second part offset, if the immediate field has two parts. |
| 4961 | // -1 if the immediate field has only one part. |
| 4962 | int doffset2; |
| 4963 | }; |
| 4964 | |
| 4965 | static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] = |
| 4966 | { |
| 4967 | {0, -1, -1}, // DATA |
| 4968 | {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16 |
| 4969 | {0xffffe0, 5, -1}, // LD [23:5]-imm19 |
| 4970 | {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi |
| 4971 | {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi |
| 4972 | {0x3ffc00, 10, -1}, // ADD [21:10]-imm12 |
| 4973 | {0x3ffc00, 10, -1}, // LDST [21:10]-imm12 |
| 4974 | {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14 |
| 4975 | {0xffffe0, 5, -1}, // CONDB [23:5]-imm19 |
| 4976 | {0x3ffffff, 0, -1}, // B [25:0]-imm26 |
| 4977 | {0x3ffffff, 0, -1}, // CALL [25:0]-imm26 |
| 4978 | }; |
| 4979 | |
| 4980 | // AArch64 relocate function class |
| 4981 | |
| 4982 | template<int size, bool big_endian> |
| 4983 | class AArch64_relocate_functions |
| 4984 | { |
| 4985 | public: |
| 4986 | typedef enum |
| 4987 | { |
| 4988 | STATUS_OKAY, // No error during relocation. |
| 4989 | STATUS_OVERFLOW, // Relocation overflow. |
| 4990 | STATUS_BAD_RELOC, // Relocation cannot be applied. |
| 4991 | } Status; |
| 4992 | |
| 4993 | typedef AArch64_relocate_functions<size, big_endian> This; |
| 4994 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| 4995 | typedef Relocate_info<size, big_endian> The_relocate_info; |
| 4996 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
| 4997 | typedef Reloc_stub<size, big_endian> The_reloc_stub; |
| 4998 | typedef Stub_table<size, big_endian> The_stub_table; |
| 4999 | typedef elfcpp::Rela<size, big_endian> The_rela; |
| 5000 | typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype; |
| 5001 | |
| 5002 | // Return the page address of the address. |
| 5003 | // Page(address) = address & ~0xFFF |
| 5004 | |
| 5005 | static inline AArch64_valtype |
| 5006 | Page(Address address) |
| 5007 | { |
| 5008 | return (address & (~static_cast<Address>(0xFFF))); |
| 5009 | } |
| 5010 | |
| 5011 | private: |
| 5012 | // Update instruction (pointed by view) with selected bits (immed). |
| 5013 | // val = (val & ~dst_mask) | (immed << doffset) |
| 5014 | |
| 5015 | template<int valsize> |
| 5016 | static inline void |
| 5017 | update_view(unsigned char* view, |
| 5018 | AArch64_valtype immed, |
| 5019 | elfcpp::Elf_Xword doffset, |
| 5020 | elfcpp::Elf_Xword dst_mask) |
| 5021 | { |
| 5022 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 5023 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 5024 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 5025 | |
| 5026 | // Clear immediate fields. |
| 5027 | val &= ~dst_mask; |
| 5028 | elfcpp::Swap<valsize, big_endian>::writeval(wv, |
| 5029 | static_cast<Valtype>(val | (immed << doffset))); |
| 5030 | } |
| 5031 | |
| 5032 | // Update two parts of an instruction (pointed by view) with selected |
| 5033 | // bits (immed1 and immed2). |
| 5034 | // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2) |
| 5035 | |
| 5036 | template<int valsize> |
| 5037 | static inline void |
| 5038 | update_view_two_parts( |
| 5039 | unsigned char* view, |
| 5040 | AArch64_valtype immed1, |
| 5041 | AArch64_valtype immed2, |
| 5042 | elfcpp::Elf_Xword doffset1, |
| 5043 | elfcpp::Elf_Xword doffset2, |
| 5044 | elfcpp::Elf_Xword dst_mask) |
| 5045 | { |
| 5046 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 5047 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 5048 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); |
| 5049 | val &= ~dst_mask; |
| 5050 | elfcpp::Swap<valsize, big_endian>::writeval(wv, |
| 5051 | static_cast<Valtype>(val | (immed1 << doffset1) | |
| 5052 | (immed2 << doffset2))); |
| 5053 | } |
| 5054 | |
| 5055 | // Update adr or adrp instruction with immed. |
| 5056 | // In adr and adrp: [30:29] immlo [23:5] immhi |
| 5057 | |
| 5058 | static inline void |
| 5059 | update_adr(unsigned char* view, AArch64_valtype immed) |
| 5060 | { |
| 5061 | elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5); |
| 5062 | This::template update_view_two_parts<32>( |
| 5063 | view, |
| 5064 | immed & 0x3, |
| 5065 | (immed & 0x1ffffc) >> 2, |
| 5066 | 29, |
| 5067 | 5, |
| 5068 | dst_mask); |
| 5069 | } |
| 5070 | |
| 5071 | // Update movz/movn instruction with bits immed. |
| 5072 | // Set instruction to movz if is_movz is true, otherwise set instruction |
| 5073 | // to movn. |
| 5074 | |
| 5075 | static inline void |
| 5076 | update_movnz(unsigned char* view, |
| 5077 | AArch64_valtype immed, |
| 5078 | bool is_movz) |
| 5079 | { |
| 5080 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; |
| 5081 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 5082 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); |
| 5083 | |
| 5084 | const elfcpp::Elf_Xword doffset = |
| 5085 | aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset; |
| 5086 | const elfcpp::Elf_Xword dst_mask = |
| 5087 | aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask; |
| 5088 | |
| 5089 | // Clear immediate fields and opc code. |
| 5090 | val &= ~(dst_mask | (0x3 << 29)); |
| 5091 | |
| 5092 | // Set instruction to movz or movn. |
| 5093 | // movz: [30:29] is 10 movn: [30:29] is 00 |
| 5094 | if (is_movz) |
| 5095 | val |= (0x2 << 29); |
| 5096 | |
| 5097 | elfcpp::Swap<32, big_endian>::writeval(wv, |
| 5098 | static_cast<Valtype>(val | (immed << doffset))); |
| 5099 | } |
| 5100 | |
| 5101 | // Update selected bits in text. |
| 5102 | |
| 5103 | template<int valsize> |
| 5104 | static inline typename This::Status |
| 5105 | reloc_common(unsigned char* view, Address x, |
| 5106 | const AArch64_reloc_property* reloc_property) |
| 5107 | { |
| 5108 | // Select bits from X. |
| 5109 | Address immed = reloc_property->select_x_value(x); |
| 5110 | |
| 5111 | // Update view. |
| 5112 | const AArch64_reloc_property::Reloc_inst inst = |
| 5113 | reloc_property->reloc_inst(); |
| 5114 | // If it is a data relocation or instruction has 2 parts of immediate |
| 5115 | // fields, you should not call pcrela_general. |
| 5116 | gold_assert(aarch64_howto[inst].doffset2 == -1 && |
| 5117 | aarch64_howto[inst].doffset != -1); |
| 5118 | This::template update_view<valsize>(view, immed, |
| 5119 | aarch64_howto[inst].doffset, |
| 5120 | aarch64_howto[inst].dst_mask); |
| 5121 | |
| 5122 | // Do check overflow or alignment if needed. |
| 5123 | return (reloc_property->checkup_x_value(x) |
| 5124 | ? This::STATUS_OKAY |
| 5125 | : This::STATUS_OVERFLOW); |
| 5126 | } |
| 5127 | |
| 5128 | public: |
| 5129 | |
| 5130 | // Construct a B insn. Note, although we group it here with other relocation |
| 5131 | // operation, there is actually no 'relocation' involved here. |
| 5132 | static inline void |
| 5133 | construct_b(unsigned char* view, unsigned int branch_offset) |
| 5134 | { |
| 5135 | update_view_two_parts<32>(view, 0x05, (branch_offset >> 2), |
| 5136 | 26, 0, 0xffffffff); |
| 5137 | } |
| 5138 | |
| 5139 | // Do a simple rela relocation at unaligned addresses. |
| 5140 | |
| 5141 | template<int valsize> |
| 5142 | static inline typename This::Status |
| 5143 | rela_ua(unsigned char* view, |
| 5144 | const Sized_relobj_file<size, big_endian>* object, |
| 5145 | const Symbol_value<size>* psymval, |
| 5146 | AArch64_valtype addend, |
| 5147 | const AArch64_reloc_property* reloc_property) |
| 5148 | { |
| 5149 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| 5150 | Valtype; |
| 5151 | typename elfcpp::Elf_types<size>::Elf_Addr x = |
| 5152 | psymval->value(object, addend); |
| 5153 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
| 5154 | static_cast<Valtype>(x)); |
| 5155 | return (reloc_property->checkup_x_value(x) |
| 5156 | ? This::STATUS_OKAY |
| 5157 | : This::STATUS_OVERFLOW); |
| 5158 | } |
| 5159 | |
| 5160 | // Do a simple pc-relative relocation at unaligned addresses. |
| 5161 | |
| 5162 | template<int valsize> |
| 5163 | static inline typename This::Status |
| 5164 | pcrela_ua(unsigned char* view, |
| 5165 | const Sized_relobj_file<size, big_endian>* object, |
| 5166 | const Symbol_value<size>* psymval, |
| 5167 | AArch64_valtype addend, |
| 5168 | Address address, |
| 5169 | const AArch64_reloc_property* reloc_property) |
| 5170 | { |
| 5171 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype |
| 5172 | Valtype; |
| 5173 | Address x = psymval->value(object, addend) - address; |
| 5174 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
| 5175 | static_cast<Valtype>(x)); |
| 5176 | return (reloc_property->checkup_x_value(x) |
| 5177 | ? This::STATUS_OKAY |
| 5178 | : This::STATUS_OVERFLOW); |
| 5179 | } |
| 5180 | |
| 5181 | // Do a simple rela relocation at aligned addresses. |
| 5182 | |
| 5183 | template<int valsize> |
| 5184 | static inline typename This::Status |
| 5185 | rela( |
| 5186 | unsigned char* view, |
| 5187 | const Sized_relobj_file<size, big_endian>* object, |
| 5188 | const Symbol_value<size>* psymval, |
| 5189 | AArch64_valtype addend, |
| 5190 | const AArch64_reloc_property* reloc_property) |
| 5191 | { |
| 5192 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
| 5193 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
| 5194 | Address x = psymval->value(object, addend); |
| 5195 | elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x)); |
| 5196 | return (reloc_property->checkup_x_value(x) |
| 5197 | ? This::STATUS_OKAY |
| 5198 | : This::STATUS_OVERFLOW); |
| 5199 | } |
| 5200 | |
| 5201 | // Do relocate. Update selected bits in text. |
| 5202 | // new_val = (val & ~dst_mask) | (immed << doffset) |
| 5203 | |
| 5204 | template<int valsize> |
| 5205 | static inline typename This::Status |
| 5206 | rela_general(unsigned char* view, |
| 5207 | const Sized_relobj_file<size, big_endian>* object, |
| 5208 | const Symbol_value<size>* psymval, |
| 5209 | AArch64_valtype addend, |
| 5210 | const AArch64_reloc_property* reloc_property) |
| 5211 | { |
| 5212 | // Calculate relocation. |
| 5213 | Address x = psymval->value(object, addend); |
| 5214 | return This::template reloc_common<valsize>(view, x, reloc_property); |
| 5215 | } |
| 5216 | |
| 5217 | // Do relocate. Update selected bits in text. |
| 5218 | // new val = (val & ~dst_mask) | (immed << doffset) |
| 5219 | |
| 5220 | template<int valsize> |
| 5221 | static inline typename This::Status |
| 5222 | rela_general( |
| 5223 | unsigned char* view, |
| 5224 | AArch64_valtype s, |
| 5225 | AArch64_valtype addend, |
| 5226 | const AArch64_reloc_property* reloc_property) |
| 5227 | { |
| 5228 | // Calculate relocation. |
| 5229 | Address x = s + addend; |
| 5230 | return This::template reloc_common<valsize>(view, x, reloc_property); |
| 5231 | } |
| 5232 | |
| 5233 | // Do address relative relocate. Update selected bits in text. |
| 5234 | // new val = (val & ~dst_mask) | (immed << doffset) |
| 5235 | |
| 5236 | template<int valsize> |
| 5237 | static inline typename This::Status |
| 5238 | pcrela_general( |
| 5239 | unsigned char* view, |
| 5240 | const Sized_relobj_file<size, big_endian>* object, |
| 5241 | const Symbol_value<size>* psymval, |
| 5242 | AArch64_valtype addend, |
| 5243 | Address address, |
| 5244 | const AArch64_reloc_property* reloc_property) |
| 5245 | { |
| 5246 | // Calculate relocation. |
| 5247 | Address x = psymval->value(object, addend) - address; |
| 5248 | return This::template reloc_common<valsize>(view, x, reloc_property); |
| 5249 | } |
| 5250 | |
| 5251 | |
| 5252 | // Calculate (S + A) - address, update adr instruction. |
| 5253 | |
| 5254 | static inline typename This::Status |
| 5255 | adr(unsigned char* view, |
| 5256 | const Sized_relobj_file<size, big_endian>* object, |
| 5257 | const Symbol_value<size>* psymval, |
| 5258 | Address addend, |
| 5259 | Address address, |
| 5260 | const AArch64_reloc_property* /* reloc_property */) |
| 5261 | { |
| 5262 | AArch64_valtype x = psymval->value(object, addend) - address; |
| 5263 | // Pick bits [20:0] of X. |
| 5264 | AArch64_valtype immed = x & 0x1fffff; |
| 5265 | update_adr(view, immed); |
| 5266 | // Check -2^20 <= X < 2^20 |
| 5267 | return (size == 64 && Bits<21>::has_overflow((x)) |
| 5268 | ? This::STATUS_OVERFLOW |
| 5269 | : This::STATUS_OKAY); |
| 5270 | } |
| 5271 | |
| 5272 | // Calculate PG(S+A) - PG(address), update adrp instruction. |
| 5273 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 5274 | |
| 5275 | static inline typename This::Status |
| 5276 | adrp( |
| 5277 | unsigned char* view, |
| 5278 | Address sa, |
| 5279 | Address address) |
| 5280 | { |
| 5281 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
| 5282 | // Pick [32:12] of X. |
| 5283 | AArch64_valtype immed = (x >> 12) & 0x1fffff; |
| 5284 | update_adr(view, immed); |
| 5285 | // Check -2^32 <= X < 2^32 |
| 5286 | return (size == 64 && Bits<33>::has_overflow((x)) |
| 5287 | ? This::STATUS_OVERFLOW |
| 5288 | : This::STATUS_OKAY); |
| 5289 | } |
| 5290 | |
| 5291 | // Calculate PG(S+A) - PG(address), update adrp instruction. |
| 5292 | // R_AARCH64_ADR_PREL_PG_HI21 |
| 5293 | |
| 5294 | static inline typename This::Status |
| 5295 | adrp(unsigned char* view, |
| 5296 | const Sized_relobj_file<size, big_endian>* object, |
| 5297 | const Symbol_value<size>* psymval, |
| 5298 | Address addend, |
| 5299 | Address address, |
| 5300 | const AArch64_reloc_property* reloc_property) |
| 5301 | { |
| 5302 | Address sa = psymval->value(object, addend); |
| 5303 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
| 5304 | // Pick [32:12] of X. |
| 5305 | AArch64_valtype immed = (x >> 12) & 0x1fffff; |
| 5306 | update_adr(view, immed); |
| 5307 | return (reloc_property->checkup_x_value(x) |
| 5308 | ? This::STATUS_OKAY |
| 5309 | : This::STATUS_OVERFLOW); |
| 5310 | } |
| 5311 | |
| 5312 | // Update mov[n/z] instruction. Check overflow if needed. |
| 5313 | // If X >=0, set the instruction to movz and its immediate value to the |
| 5314 | // selected bits S. |
| 5315 | // If X < 0, set the instruction to movn and its immediate value to |
| 5316 | // NOT (selected bits of). |
| 5317 | |
| 5318 | static inline typename This::Status |
| 5319 | movnz(unsigned char* view, |
| 5320 | AArch64_valtype x, |
| 5321 | const AArch64_reloc_property* reloc_property) |
| 5322 | { |
| 5323 | // Select bits from X. |
| 5324 | Address immed; |
| 5325 | bool is_movz; |
| 5326 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW; |
| 5327 | if (static_cast<SignedW>(x) >= 0) |
| 5328 | { |
| 5329 | immed = reloc_property->select_x_value(x); |
| 5330 | is_movz = true; |
| 5331 | } |
| 5332 | else |
| 5333 | { |
| 5334 | immed = reloc_property->select_x_value(~x);; |
| 5335 | is_movz = false; |
| 5336 | } |
| 5337 | |
| 5338 | // Update movnz instruction. |
| 5339 | update_movnz(view, immed, is_movz); |
| 5340 | |
| 5341 | // Do check overflow or alignment if needed. |
| 5342 | return (reloc_property->checkup_x_value(x) |
| 5343 | ? This::STATUS_OKAY |
| 5344 | : This::STATUS_OVERFLOW); |
| 5345 | } |
| 5346 | |
| 5347 | static inline bool |
| 5348 | maybe_apply_stub(unsigned int, |
| 5349 | const The_relocate_info*, |
| 5350 | const The_rela&, |
| 5351 | unsigned char*, |
| 5352 | Address, |
| 5353 | const Sized_symbol<size>*, |
| 5354 | const Symbol_value<size>*, |
| 5355 | const Sized_relobj_file<size, big_endian>*, |
| 5356 | section_size_type); |
| 5357 | |
| 5358 | }; // End of AArch64_relocate_functions |
| 5359 | |
| 5360 | |
| 5361 | // For a certain relocation type (usually jump/branch), test to see if the |
| 5362 | // destination needs a stub to fulfil. If so, re-route the destination of the |
| 5363 | // original instruction to the stub, note, at this time, the stub has already |
| 5364 | // been generated. |
| 5365 | |
| 5366 | template<int size, bool big_endian> |
| 5367 | bool |
| 5368 | AArch64_relocate_functions<size, big_endian>:: |
| 5369 | maybe_apply_stub(unsigned int r_type, |
| 5370 | const The_relocate_info* relinfo, |
| 5371 | const The_rela& rela, |
| 5372 | unsigned char* view, |
| 5373 | Address address, |
| 5374 | const Sized_symbol<size>* gsym, |
| 5375 | const Symbol_value<size>* psymval, |
| 5376 | const Sized_relobj_file<size, big_endian>* object, |
| 5377 | section_size_type current_group_size) |
| 5378 | { |
| 5379 | if (parameters->options().relocatable()) |
| 5380 | return false; |
| 5381 | |
| 5382 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend(); |
| 5383 | Address branch_target = psymval->value(object, 0) + addend; |
| 5384 | int stub_type = |
| 5385 | The_reloc_stub::stub_type_for_reloc(r_type, address, branch_target); |
| 5386 | if (stub_type == ST_NONE) |
| 5387 | return false; |
| 5388 | |
| 5389 | const The_aarch64_relobj* aarch64_relobj = |
| 5390 | static_cast<const The_aarch64_relobj*>(object); |
| 5391 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); |
| 5392 | gold_assert(stub_table != NULL); |
| 5393 | |
| 5394 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 5395 | typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); |
| 5396 | The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key); |
| 5397 | gold_assert(stub != NULL); |
| 5398 | |
| 5399 | Address new_branch_target = stub_table->address() + stub->offset(); |
| 5400 | typename elfcpp::Swap<size, big_endian>::Valtype branch_offset = |
| 5401 | new_branch_target - address; |
| 5402 | const AArch64_reloc_property* arp = |
| 5403 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 5404 | gold_assert(arp != NULL); |
| 5405 | typename This::Status status = This::template |
| 5406 | rela_general<32>(view, branch_offset, 0, arp); |
| 5407 | if (status != This::STATUS_OKAY) |
| 5408 | gold_error(_("Stub is too far away, try a smaller value " |
| 5409 | "for '--stub-group-size'. The current value is 0x%lx."), |
| 5410 | static_cast<unsigned long>(current_group_size)); |
| 5411 | return true; |
| 5412 | } |
| 5413 | |
| 5414 | |
| 5415 | // Group input sections for stub generation. |
| 5416 | // |
| 5417 | // We group input sections in an output section so that the total size, |
| 5418 | // including any padding space due to alignment is smaller than GROUP_SIZE |
| 5419 | // unless the only input section in group is bigger than GROUP_SIZE already. |
| 5420 | // Then an ARM stub table is created to follow the last input section |
| 5421 | // in group. For each group an ARM stub table is created an is placed |
| 5422 | // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further |
| 5423 | // extend the group after the stub table. |
| 5424 | |
| 5425 | template<int size, bool big_endian> |
| 5426 | void |
| 5427 | Target_aarch64<size, big_endian>::group_sections( |
| 5428 | Layout* layout, |
| 5429 | section_size_type group_size, |
| 5430 | bool stubs_always_after_branch, |
| 5431 | const Task* task) |
| 5432 | { |
| 5433 | // Group input sections and insert stub table |
| 5434 | Layout::Section_list section_list; |
| 5435 | layout->get_executable_sections(§ion_list); |
| 5436 | for (Layout::Section_list::const_iterator p = section_list.begin(); |
| 5437 | p != section_list.end(); |
| 5438 | ++p) |
| 5439 | { |
| 5440 | AArch64_output_section<size, big_endian>* output_section = |
| 5441 | static_cast<AArch64_output_section<size, big_endian>*>(*p); |
| 5442 | output_section->group_sections(group_size, stubs_always_after_branch, |
| 5443 | this, task); |
| 5444 | } |
| 5445 | } |
| 5446 | |
| 5447 | |
| 5448 | // Find the AArch64_input_section object corresponding to the SHNDX-th input |
| 5449 | // section of RELOBJ. |
| 5450 | |
| 5451 | template<int size, bool big_endian> |
| 5452 | AArch64_input_section<size, big_endian>* |
| 5453 | Target_aarch64<size, big_endian>::find_aarch64_input_section( |
| 5454 | Relobj* relobj, unsigned int shndx) const |
| 5455 | { |
| 5456 | Section_id sid(relobj, shndx); |
| 5457 | typename AArch64_input_section_map::const_iterator p = |
| 5458 | this->aarch64_input_section_map_.find(sid); |
| 5459 | return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL; |
| 5460 | } |
| 5461 | |
| 5462 | |
| 5463 | // Make a new AArch64_input_section object. |
| 5464 | |
| 5465 | template<int size, bool big_endian> |
| 5466 | AArch64_input_section<size, big_endian>* |
| 5467 | Target_aarch64<size, big_endian>::new_aarch64_input_section( |
| 5468 | Relobj* relobj, unsigned int shndx) |
| 5469 | { |
| 5470 | Section_id sid(relobj, shndx); |
| 5471 | |
| 5472 | AArch64_input_section<size, big_endian>* input_section = |
| 5473 | new AArch64_input_section<size, big_endian>(relobj, shndx); |
| 5474 | input_section->init(); |
| 5475 | |
| 5476 | // Register new AArch64_input_section in map for look-up. |
| 5477 | std::pair<typename AArch64_input_section_map::iterator,bool> ins = |
| 5478 | this->aarch64_input_section_map_.insert( |
| 5479 | std::make_pair(sid, input_section)); |
| 5480 | |
| 5481 | // Make sure that it we have not created another AArch64_input_section |
| 5482 | // for this input section already. |
| 5483 | gold_assert(ins.second); |
| 5484 | |
| 5485 | return input_section; |
| 5486 | } |
| 5487 | |
| 5488 | |
| 5489 | // Relaxation hook. This is where we do stub generation. |
| 5490 | |
| 5491 | template<int size, bool big_endian> |
| 5492 | bool |
| 5493 | Target_aarch64<size, big_endian>::do_relax( |
| 5494 | int pass, |
| 5495 | const Input_objects* input_objects, |
| 5496 | Symbol_table* symtab, |
| 5497 | Layout* layout , |
| 5498 | const Task* task) |
| 5499 | { |
| 5500 | gold_assert(!parameters->options().relocatable()); |
| 5501 | if (pass == 1) |
| 5502 | { |
| 5503 | // We don't handle negative stub_group_size right now. |
| 5504 | this->stub_group_size_ = abs(parameters->options().stub_group_size()); |
| 5505 | if (this->stub_group_size_ == 1) |
| 5506 | { |
| 5507 | // Leave room for 4096 4-byte stub entries. If we exceed that, then we |
| 5508 | // will fail to link. The user will have to relink with an explicit |
| 5509 | // group size option. |
| 5510 | this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET - |
| 5511 | 4096 * 4; |
| 5512 | } |
| 5513 | group_sections(layout, this->stub_group_size_, true, task); |
| 5514 | } |
| 5515 | else |
| 5516 | { |
| 5517 | // If this is not the first pass, addresses and file offsets have |
| 5518 | // been reset at this point, set them here. |
| 5519 | for (Stub_table_iterator sp = this->stub_tables_.begin(); |
| 5520 | sp != this->stub_tables_.end(); ++sp) |
| 5521 | { |
| 5522 | The_stub_table* stt = *sp; |
| 5523 | The_aarch64_input_section* owner = stt->owner(); |
| 5524 | off_t off = align_address(owner->original_size(), |
| 5525 | stt->addralign()); |
| 5526 | stt->set_address_and_file_offset(owner->address() + off, |
| 5527 | owner->offset() + off); |
| 5528 | } |
| 5529 | } |
| 5530 | |
| 5531 | // Scan relocs for relocation stubs |
| 5532 | for (Input_objects::Relobj_iterator op = input_objects->relobj_begin(); |
| 5533 | op != input_objects->relobj_end(); |
| 5534 | ++op) |
| 5535 | { |
| 5536 | The_aarch64_relobj* aarch64_relobj = |
| 5537 | static_cast<The_aarch64_relobj*>(*op); |
| 5538 | // Lock the object so we can read from it. This is only called |
| 5539 | // single-threaded from Layout::finalize, so it is OK to lock. |
| 5540 | Task_lock_obj<Object> tl(task, aarch64_relobj); |
| 5541 | aarch64_relobj->scan_sections_for_stubs(this, symtab, layout); |
| 5542 | } |
| 5543 | |
| 5544 | bool any_stub_table_changed = false; |
| 5545 | for (Stub_table_iterator siter = this->stub_tables_.begin(); |
| 5546 | siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter) |
| 5547 | { |
| 5548 | The_stub_table* stub_table = *siter; |
| 5549 | if (stub_table->update_data_size_changed_p()) |
| 5550 | { |
| 5551 | The_aarch64_input_section* owner = stub_table->owner(); |
| 5552 | uint64_t address = owner->address(); |
| 5553 | off_t offset = owner->offset(); |
| 5554 | owner->reset_address_and_file_offset(); |
| 5555 | owner->set_address_and_file_offset(address, offset); |
| 5556 | |
| 5557 | any_stub_table_changed = true; |
| 5558 | } |
| 5559 | } |
| 5560 | |
| 5561 | // Do not continue relaxation. |
| 5562 | bool continue_relaxation = any_stub_table_changed; |
| 5563 | if (!continue_relaxation) |
| 5564 | for (Stub_table_iterator sp = this->stub_tables_.begin(); |
| 5565 | (sp != this->stub_tables_.end()); |
| 5566 | ++sp) |
| 5567 | (*sp)->finalize_stubs(); |
| 5568 | |
| 5569 | return continue_relaxation; |
| 5570 | } |
| 5571 | |
| 5572 | |
| 5573 | // Make a new Stub_table. |
| 5574 | |
| 5575 | template<int size, bool big_endian> |
| 5576 | Stub_table<size, big_endian>* |
| 5577 | Target_aarch64<size, big_endian>::new_stub_table( |
| 5578 | AArch64_input_section<size, big_endian>* owner) |
| 5579 | { |
| 5580 | Stub_table<size, big_endian>* stub_table = |
| 5581 | new Stub_table<size, big_endian>(owner); |
| 5582 | stub_table->set_address(align_address( |
| 5583 | owner->address() + owner->data_size(), 8)); |
| 5584 | stub_table->set_file_offset(owner->offset() + owner->data_size()); |
| 5585 | stub_table->finalize_data_size(); |
| 5586 | |
| 5587 | this->stub_tables_.push_back(stub_table); |
| 5588 | |
| 5589 | return stub_table; |
| 5590 | } |
| 5591 | |
| 5592 | |
| 5593 | template<int size, bool big_endian> |
| 5594 | uint64_t |
| 5595 | Target_aarch64<size, big_endian>::do_reloc_addend( |
| 5596 | void* arg, unsigned int r_type, uint64_t) const |
| 5597 | { |
| 5598 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); |
| 5599 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); |
| 5600 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); |
| 5601 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); |
| 5602 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
| 5603 | gold_assert(psymval->is_tls_symbol()); |
| 5604 | // The value of a TLS symbol is the offset in the TLS segment. |
| 5605 | return psymval->value(ti.object, 0); |
| 5606 | } |
| 5607 | |
| 5608 | // Return the number of entries in the PLT. |
| 5609 | |
| 5610 | template<int size, bool big_endian> |
| 5611 | unsigned int |
| 5612 | Target_aarch64<size, big_endian>::plt_entry_count() const |
| 5613 | { |
| 5614 | if (this->plt_ == NULL) |
| 5615 | return 0; |
| 5616 | return this->plt_->entry_count(); |
| 5617 | } |
| 5618 | |
| 5619 | // Return the offset of the first non-reserved PLT entry. |
| 5620 | |
| 5621 | template<int size, bool big_endian> |
| 5622 | unsigned int |
| 5623 | Target_aarch64<size, big_endian>::first_plt_entry_offset() const |
| 5624 | { |
| 5625 | return this->plt_->first_plt_entry_offset(); |
| 5626 | } |
| 5627 | |
| 5628 | // Return the size of each PLT entry. |
| 5629 | |
| 5630 | template<int size, bool big_endian> |
| 5631 | unsigned int |
| 5632 | Target_aarch64<size, big_endian>::plt_entry_size() const |
| 5633 | { |
| 5634 | return this->plt_->get_plt_entry_size(); |
| 5635 | } |
| 5636 | |
| 5637 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
| 5638 | |
| 5639 | template<int size, bool big_endian> |
| 5640 | void |
| 5641 | Target_aarch64<size, big_endian>::define_tls_base_symbol( |
| 5642 | Symbol_table* symtab, Layout* layout) |
| 5643 | { |
| 5644 | if (this->tls_base_symbol_defined_) |
| 5645 | return; |
| 5646 | |
| 5647 | Output_segment* tls_segment = layout->tls_segment(); |
| 5648 | if (tls_segment != NULL) |
| 5649 | { |
| 5650 | // _TLS_MODULE_BASE_ always points to the beginning of tls segment. |
| 5651 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
| 5652 | Symbol_table::PREDEFINED, |
| 5653 | tls_segment, 0, 0, |
| 5654 | elfcpp::STT_TLS, |
| 5655 | elfcpp::STB_LOCAL, |
| 5656 | elfcpp::STV_HIDDEN, 0, |
| 5657 | Symbol::SEGMENT_START, |
| 5658 | true); |
| 5659 | } |
| 5660 | this->tls_base_symbol_defined_ = true; |
| 5661 | } |
| 5662 | |
| 5663 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
| 5664 | |
| 5665 | template<int size, bool big_endian> |
| 5666 | void |
| 5667 | Target_aarch64<size, big_endian>::reserve_tlsdesc_entries( |
| 5668 | Symbol_table* symtab, Layout* layout) |
| 5669 | { |
| 5670 | if (this->plt_ == NULL) |
| 5671 | this->make_plt_section(symtab, layout); |
| 5672 | |
| 5673 | if (!this->plt_->has_tlsdesc_entry()) |
| 5674 | { |
| 5675 | // Allocate the TLSDESC_GOT entry. |
| 5676 | Output_data_got_aarch64<size, big_endian>* got = |
| 5677 | this->got_section(symtab, layout); |
| 5678 | unsigned int got_offset = got->add_constant(0); |
| 5679 | |
| 5680 | // Allocate the TLSDESC_PLT entry. |
| 5681 | this->plt_->reserve_tlsdesc_entry(got_offset); |
| 5682 | } |
| 5683 | } |
| 5684 | |
| 5685 | // Create a GOT entry for the TLS module index. |
| 5686 | |
| 5687 | template<int size, bool big_endian> |
| 5688 | unsigned int |
| 5689 | Target_aarch64<size, big_endian>::got_mod_index_entry( |
| 5690 | Symbol_table* symtab, Layout* layout, |
| 5691 | Sized_relobj_file<size, big_endian>* object) |
| 5692 | { |
| 5693 | if (this->got_mod_index_offset_ == -1U) |
| 5694 | { |
| 5695 | gold_assert(symtab != NULL && layout != NULL && object != NULL); |
| 5696 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
| 5697 | Output_data_got_aarch64<size, big_endian>* got = |
| 5698 | this->got_section(symtab, layout); |
| 5699 | unsigned int got_offset = got->add_constant(0); |
| 5700 | rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got, |
| 5701 | got_offset, 0); |
| 5702 | got->add_constant(0); |
| 5703 | this->got_mod_index_offset_ = got_offset; |
| 5704 | } |
| 5705 | return this->got_mod_index_offset_; |
| 5706 | } |
| 5707 | |
| 5708 | // Optimize the TLS relocation type based on what we know about the |
| 5709 | // symbol. IS_FINAL is true if the final address of this symbol is |
| 5710 | // known at link time. |
| 5711 | |
| 5712 | template<int size, bool big_endian> |
| 5713 | tls::Tls_optimization |
| 5714 | Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final, |
| 5715 | int r_type) |
| 5716 | { |
| 5717 | // If we are generating a shared library, then we can't do anything |
| 5718 | // in the linker |
| 5719 | if (parameters->options().shared()) |
| 5720 | return tls::TLSOPT_NONE; |
| 5721 | |
| 5722 | switch (r_type) |
| 5723 | { |
| 5724 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 5725 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 5726 | case elfcpp::R_AARCH64_TLSDESC_LD_PREL19: |
| 5727 | case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21: |
| 5728 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 5729 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 5730 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 5731 | case elfcpp::R_AARCH64_TLSDESC_OFF_G1: |
| 5732 | case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC: |
| 5733 | case elfcpp::R_AARCH64_TLSDESC_LDR: |
| 5734 | case elfcpp::R_AARCH64_TLSDESC_ADD: |
| 5735 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 5736 | // These are General-Dynamic which permits fully general TLS |
| 5737 | // access. Since we know that we are generating an executable, |
| 5738 | // we can convert this to Initial-Exec. If we also know that |
| 5739 | // this is a local symbol, we can further switch to Local-Exec. |
| 5740 | if (is_final) |
| 5741 | return tls::TLSOPT_TO_LE; |
| 5742 | return tls::TLSOPT_TO_IE; |
| 5743 | |
| 5744 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 5745 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 5746 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 5747 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 5748 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 5749 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 5750 | // These are Local-Dynamic, which refer to local symbols in the |
| 5751 | // dynamic TLS block. Since we know that we generating an |
| 5752 | // executable, we can switch to Local-Exec. |
| 5753 | return tls::TLSOPT_TO_LE; |
| 5754 | |
| 5755 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1: |
| 5756 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC: |
| 5757 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 5758 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 5759 | case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19: |
| 5760 | // These are Initial-Exec relocs which get the thread offset |
| 5761 | // from the GOT. If we know that we are linking against the |
| 5762 | // local symbol, we can switch to Local-Exec, which links the |
| 5763 | // thread offset into the instruction. |
| 5764 | if (is_final) |
| 5765 | return tls::TLSOPT_TO_LE; |
| 5766 | return tls::TLSOPT_NONE; |
| 5767 | |
| 5768 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 5769 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 5770 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 5771 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 5772 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 5773 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 5774 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 5775 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 5776 | // When we already have Local-Exec, there is nothing further we |
| 5777 | // can do. |
| 5778 | return tls::TLSOPT_NONE; |
| 5779 | |
| 5780 | default: |
| 5781 | gold_unreachable(); |
| 5782 | } |
| 5783 | } |
| 5784 | |
| 5785 | // Returns true if this relocation type could be that of a function pointer. |
| 5786 | |
| 5787 | template<int size, bool big_endian> |
| 5788 | inline bool |
| 5789 | Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc( |
| 5790 | unsigned int r_type) |
| 5791 | { |
| 5792 | switch (r_type) |
| 5793 | { |
| 5794 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: |
| 5795 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: |
| 5796 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: |
| 5797 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 5798 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 5799 | { |
| 5800 | return true; |
| 5801 | } |
| 5802 | } |
| 5803 | return false; |
| 5804 | } |
| 5805 | |
| 5806 | // For safe ICF, scan a relocation for a local symbol to check if it |
| 5807 | // corresponds to a function pointer being taken. In that case mark |
| 5808 | // the function whose pointer was taken as not foldable. |
| 5809 | |
| 5810 | template<int size, bool big_endian> |
| 5811 | inline bool |
| 5812 | Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer( |
| 5813 | Symbol_table* , |
| 5814 | Layout* , |
| 5815 | Target_aarch64<size, big_endian>* , |
| 5816 | Sized_relobj_file<size, big_endian>* , |
| 5817 | unsigned int , |
| 5818 | Output_section* , |
| 5819 | const elfcpp::Rela<size, big_endian>& , |
| 5820 | unsigned int r_type, |
| 5821 | const elfcpp::Sym<size, big_endian>&) |
| 5822 | { |
| 5823 | // When building a shared library, do not fold any local symbols. |
| 5824 | return (parameters->options().shared() |
| 5825 | || possible_function_pointer_reloc(r_type)); |
| 5826 | } |
| 5827 | |
| 5828 | // For safe ICF, scan a relocation for a global symbol to check if it |
| 5829 | // corresponds to a function pointer being taken. In that case mark |
| 5830 | // the function whose pointer was taken as not foldable. |
| 5831 | |
| 5832 | template<int size, bool big_endian> |
| 5833 | inline bool |
| 5834 | Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer( |
| 5835 | Symbol_table* , |
| 5836 | Layout* , |
| 5837 | Target_aarch64<size, big_endian>* , |
| 5838 | Sized_relobj_file<size, big_endian>* , |
| 5839 | unsigned int , |
| 5840 | Output_section* , |
| 5841 | const elfcpp::Rela<size, big_endian>& , |
| 5842 | unsigned int r_type, |
| 5843 | Symbol* gsym) |
| 5844 | { |
| 5845 | // When building a shared library, do not fold symbols whose visibility |
| 5846 | // is hidden, internal or protected. |
| 5847 | return ((parameters->options().shared() |
| 5848 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
| 5849 | || gsym->visibility() == elfcpp::STV_PROTECTED |
| 5850 | || gsym->visibility() == elfcpp::STV_HIDDEN)) |
| 5851 | || possible_function_pointer_reloc(r_type)); |
| 5852 | } |
| 5853 | |
| 5854 | // Report an unsupported relocation against a local symbol. |
| 5855 | |
| 5856 | template<int size, bool big_endian> |
| 5857 | void |
| 5858 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local( |
| 5859 | Sized_relobj_file<size, big_endian>* object, |
| 5860 | unsigned int r_type) |
| 5861 | { |
| 5862 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
| 5863 | object->name().c_str(), r_type); |
| 5864 | } |
| 5865 | |
| 5866 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
| 5867 | // dynamic linker does not support it, issue an error. |
| 5868 | |
| 5869 | template<int size, bool big_endian> |
| 5870 | void |
| 5871 | Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object, |
| 5872 | unsigned int r_type) |
| 5873 | { |
| 5874 | gold_assert(r_type != elfcpp::R_AARCH64_NONE); |
| 5875 | |
| 5876 | switch (r_type) |
| 5877 | { |
| 5878 | // These are the relocation types supported by glibc for AARCH64. |
| 5879 | case elfcpp::R_AARCH64_NONE: |
| 5880 | case elfcpp::R_AARCH64_COPY: |
| 5881 | case elfcpp::R_AARCH64_GLOB_DAT: |
| 5882 | case elfcpp::R_AARCH64_JUMP_SLOT: |
| 5883 | case elfcpp::R_AARCH64_RELATIVE: |
| 5884 | case elfcpp::R_AARCH64_TLS_DTPREL64: |
| 5885 | case elfcpp::R_AARCH64_TLS_DTPMOD64: |
| 5886 | case elfcpp::R_AARCH64_TLS_TPREL64: |
| 5887 | case elfcpp::R_AARCH64_TLSDESC: |
| 5888 | case elfcpp::R_AARCH64_IRELATIVE: |
| 5889 | case elfcpp::R_AARCH64_ABS32: |
| 5890 | case elfcpp::R_AARCH64_ABS64: |
| 5891 | return; |
| 5892 | |
| 5893 | default: |
| 5894 | break; |
| 5895 | } |
| 5896 | |
| 5897 | // This prevents us from issuing more than one error per reloc |
| 5898 | // section. But we can still wind up issuing more than one |
| 5899 | // error per object file. |
| 5900 | if (this->issued_non_pic_error_) |
| 5901 | return; |
| 5902 | gold_assert(parameters->options().output_is_position_independent()); |
| 5903 | object->error(_("requires unsupported dynamic reloc; " |
| 5904 | "recompile with -fPIC")); |
| 5905 | this->issued_non_pic_error_ = true; |
| 5906 | return; |
| 5907 | } |
| 5908 | |
| 5909 | // Return whether we need to make a PLT entry for a relocation of the |
| 5910 | // given type against a STT_GNU_IFUNC symbol. |
| 5911 | |
| 5912 | template<int size, bool big_endian> |
| 5913 | bool |
| 5914 | Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( |
| 5915 | Sized_relobj_file<size, big_endian>* object, |
| 5916 | unsigned int r_type) |
| 5917 | { |
| 5918 | const AArch64_reloc_property* arp = |
| 5919 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 5920 | gold_assert(arp != NULL); |
| 5921 | |
| 5922 | int flags = arp->reference_flags(); |
| 5923 | if (flags & Symbol::TLS_REF) |
| 5924 | { |
| 5925 | gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"), |
| 5926 | object->name().c_str(), arp->name().c_str()); |
| 5927 | return false; |
| 5928 | } |
| 5929 | return flags != 0; |
| 5930 | } |
| 5931 | |
| 5932 | // Scan a relocation for a local symbol. |
| 5933 | |
| 5934 | template<int size, bool big_endian> |
| 5935 | inline void |
| 5936 | Target_aarch64<size, big_endian>::Scan::local( |
| 5937 | Symbol_table* symtab, |
| 5938 | Layout* layout, |
| 5939 | Target_aarch64<size, big_endian>* target, |
| 5940 | Sized_relobj_file<size, big_endian>* object, |
| 5941 | unsigned int data_shndx, |
| 5942 | Output_section* output_section, |
| 5943 | const elfcpp::Rela<size, big_endian>& rela, |
| 5944 | unsigned int r_type, |
| 5945 | const elfcpp::Sym<size, big_endian>& lsym, |
| 5946 | bool is_discarded) |
| 5947 | { |
| 5948 | if (is_discarded) |
| 5949 | return; |
| 5950 | |
| 5951 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 5952 | Reloc_section; |
| 5953 | Output_data_got_aarch64<size, big_endian>* got = |
| 5954 | target->got_section(symtab, layout); |
| 5955 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 5956 | |
| 5957 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
| 5958 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
| 5959 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| 5960 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
| 5961 | |
| 5962 | switch (r_type) |
| 5963 | { |
| 5964 | case elfcpp::R_AARCH64_ABS32: |
| 5965 | case elfcpp::R_AARCH64_ABS16: |
| 5966 | if (parameters->options().output_is_position_independent()) |
| 5967 | { |
| 5968 | gold_error(_("%s: unsupported reloc %u in pos independent link."), |
| 5969 | object->name().c_str(), r_type); |
| 5970 | } |
| 5971 | break; |
| 5972 | |
| 5973 | case elfcpp::R_AARCH64_ABS64: |
| 5974 | // If building a shared library or pie, we need to mark this as a dynmic |
| 5975 | // reloction, so that the dynamic loader can relocate it. |
| 5976 | if (parameters->options().output_is_position_independent()) |
| 5977 | { |
| 5978 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 5979 | rela_dyn->add_local_relative(object, r_sym, |
| 5980 | elfcpp::R_AARCH64_RELATIVE, |
| 5981 | output_section, |
| 5982 | data_shndx, |
| 5983 | rela.get_r_offset(), |
| 5984 | rela.get_r_addend(), |
| 5985 | is_ifunc); |
| 5986 | } |
| 5987 | break; |
| 5988 | |
| 5989 | case elfcpp::R_AARCH64_PREL64: |
| 5990 | case elfcpp::R_AARCH64_PREL32: |
| 5991 | case elfcpp::R_AARCH64_PREL16: |
| 5992 | break; |
| 5993 | |
| 5994 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 5995 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 5996 | // This pair of relocations is used to access a specific GOT entry. |
| 5997 | { |
| 5998 | bool is_new = false; |
| 5999 | // This symbol requires a GOT entry. |
| 6000 | if (is_ifunc) |
| 6001 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
| 6002 | else |
| 6003 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); |
| 6004 | if (is_new && parameters->options().output_is_position_independent()) |
| 6005 | target->rela_dyn_section(layout)-> |
| 6006 | add_local_relative(object, |
| 6007 | r_sym, |
| 6008 | elfcpp::R_AARCH64_RELATIVE, |
| 6009 | got, |
| 6010 | object->local_got_offset(r_sym, |
| 6011 | GOT_TYPE_STANDARD), |
| 6012 | 0, |
| 6013 | false); |
| 6014 | } |
| 6015 | break; |
| 6016 | |
| 6017 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
| 6018 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 |
| 6019 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 |
| 6020 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 |
| 6021 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 |
| 6022 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 |
| 6023 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 |
| 6024 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 |
| 6025 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 |
| 6026 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
| 6027 | break; |
| 6028 | |
| 6029 | // Control flow, pc-relative. We don't need to do anything for a relative |
| 6030 | // addressing relocation against a local symbol if it does not reference |
| 6031 | // the GOT. |
| 6032 | case elfcpp::R_AARCH64_TSTBR14: |
| 6033 | case elfcpp::R_AARCH64_CONDBR19: |
| 6034 | case elfcpp::R_AARCH64_JUMP26: |
| 6035 | case elfcpp::R_AARCH64_CALL26: |
| 6036 | break; |
| 6037 | |
| 6038 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 6039 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 6040 | { |
| 6041 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6042 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 6043 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 6044 | break; |
| 6045 | |
| 6046 | layout->set_has_static_tls(); |
| 6047 | // Create a GOT entry for the tp-relative offset. |
| 6048 | if (!parameters->doing_static_link()) |
| 6049 | { |
| 6050 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, |
| 6051 | target->rela_dyn_section(layout), |
| 6052 | elfcpp::R_AARCH64_TLS_TPREL64); |
| 6053 | } |
| 6054 | else if (!object->local_has_got_offset(r_sym, |
| 6055 | GOT_TYPE_TLS_OFFSET)) |
| 6056 | { |
| 6057 | got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET); |
| 6058 | unsigned int got_offset = |
| 6059 | object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET); |
| 6060 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6061 | gold_assert(addend == 0); |
| 6062 | got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64, |
| 6063 | object, r_sym); |
| 6064 | } |
| 6065 | } |
| 6066 | break; |
| 6067 | |
| 6068 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 6069 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 6070 | { |
| 6071 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6072 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 6073 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 6074 | { |
| 6075 | layout->set_has_static_tls(); |
| 6076 | break; |
| 6077 | } |
| 6078 | gold_assert(tlsopt == tls::TLSOPT_NONE); |
| 6079 | |
| 6080 | got->add_local_pair_with_rel(object,r_sym, data_shndx, |
| 6081 | GOT_TYPE_TLS_PAIR, |
| 6082 | target->rela_dyn_section(layout), |
| 6083 | elfcpp::R_AARCH64_TLS_DTPMOD64); |
| 6084 | } |
| 6085 | break; |
| 6086 | |
| 6087 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 6088 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 6089 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 6090 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 6091 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 6092 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 6093 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 6094 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 6095 | { |
| 6096 | layout->set_has_static_tls(); |
| 6097 | bool output_is_shared = parameters->options().shared(); |
| 6098 | if (output_is_shared) |
| 6099 | gold_error(_("%s: unsupported TLSLE reloc %u in shared code."), |
| 6100 | object->name().c_str(), r_type); |
| 6101 | } |
| 6102 | break; |
| 6103 | |
| 6104 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 6105 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 6106 | { |
| 6107 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6108 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 6109 | if (tlsopt == tls::TLSOPT_NONE) |
| 6110 | { |
| 6111 | // Create a GOT entry for the module index. |
| 6112 | target->got_mod_index_entry(symtab, layout, object); |
| 6113 | } |
| 6114 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 6115 | unsupported_reloc_local(object, r_type); |
| 6116 | } |
| 6117 | break; |
| 6118 | |
| 6119 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 6120 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 6121 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 6122 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 6123 | break; |
| 6124 | |
| 6125 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 6126 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 6127 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 6128 | { |
| 6129 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6130 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 6131 | target->define_tls_base_symbol(symtab, layout); |
| 6132 | if (tlsopt == tls::TLSOPT_NONE) |
| 6133 | { |
| 6134 | // Create reserved PLT and GOT entries for the resolver. |
| 6135 | target->reserve_tlsdesc_entries(symtab, layout); |
| 6136 | |
| 6137 | // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc. |
| 6138 | // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT |
| 6139 | // entry needs to be in an area in .got.plt, not .got. Call |
| 6140 | // got_section to make sure the section has been created. |
| 6141 | target->got_section(symtab, layout); |
| 6142 | Output_data_got<size, big_endian>* got = |
| 6143 | target->got_tlsdesc_section(); |
| 6144 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 6145 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
| 6146 | { |
| 6147 | unsigned int got_offset = got->add_constant(0); |
| 6148 | got->add_constant(0); |
| 6149 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, |
| 6150 | got_offset); |
| 6151 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
| 6152 | // We store the arguments we need in a vector, and use |
| 6153 | // the index into the vector as the parameter to pass |
| 6154 | // to the target specific routines. |
| 6155 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); |
| 6156 | void* arg = reinterpret_cast<void*>(intarg); |
| 6157 | rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg, |
| 6158 | got, got_offset, 0); |
| 6159 | } |
| 6160 | } |
| 6161 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 6162 | unsupported_reloc_local(object, r_type); |
| 6163 | } |
| 6164 | break; |
| 6165 | |
| 6166 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 6167 | break; |
| 6168 | |
| 6169 | default: |
| 6170 | unsupported_reloc_local(object, r_type); |
| 6171 | } |
| 6172 | } |
| 6173 | |
| 6174 | |
| 6175 | // Report an unsupported relocation against a global symbol. |
| 6176 | |
| 6177 | template<int size, bool big_endian> |
| 6178 | void |
| 6179 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global( |
| 6180 | Sized_relobj_file<size, big_endian>* object, |
| 6181 | unsigned int r_type, |
| 6182 | Symbol* gsym) |
| 6183 | { |
| 6184 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
| 6185 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
| 6186 | } |
| 6187 | |
| 6188 | template<int size, bool big_endian> |
| 6189 | inline void |
| 6190 | Target_aarch64<size, big_endian>::Scan::global( |
| 6191 | Symbol_table* symtab, |
| 6192 | Layout* layout, |
| 6193 | Target_aarch64<size, big_endian>* target, |
| 6194 | Sized_relobj_file<size, big_endian> * object, |
| 6195 | unsigned int data_shndx, |
| 6196 | Output_section* output_section, |
| 6197 | const elfcpp::Rela<size, big_endian>& rela, |
| 6198 | unsigned int r_type, |
| 6199 | Symbol* gsym) |
| 6200 | { |
| 6201 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
| 6202 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 6203 | && this->reloc_needs_plt_for_ifunc(object, r_type)) |
| 6204 | target->make_plt_entry(symtab, layout, gsym); |
| 6205 | |
| 6206 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
| 6207 | Reloc_section; |
| 6208 | const AArch64_reloc_property* arp = |
| 6209 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 6210 | gold_assert(arp != NULL); |
| 6211 | |
| 6212 | switch (r_type) |
| 6213 | { |
| 6214 | case elfcpp::R_AARCH64_ABS16: |
| 6215 | case elfcpp::R_AARCH64_ABS32: |
| 6216 | case elfcpp::R_AARCH64_ABS64: |
| 6217 | { |
| 6218 | // Make a PLT entry if necessary. |
| 6219 | if (gsym->needs_plt_entry()) |
| 6220 | { |
| 6221 | target->make_plt_entry(symtab, layout, gsym); |
| 6222 | // Since this is not a PC-relative relocation, we may be |
| 6223 | // taking the address of a function. In that case we need to |
| 6224 | // set the entry in the dynamic symbol table to the address of |
| 6225 | // the PLT entry. |
| 6226 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
| 6227 | gsym->set_needs_dynsym_value(); |
| 6228 | } |
| 6229 | // Make a dynamic relocation if necessary. |
| 6230 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
| 6231 | { |
| 6232 | if (!parameters->options().output_is_position_independent() |
| 6233 | && gsym->may_need_copy_reloc()) |
| 6234 | { |
| 6235 | target->copy_reloc(symtab, layout, object, |
| 6236 | data_shndx, output_section, gsym, rela); |
| 6237 | } |
| 6238 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
| 6239 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
| 6240 | && gsym->can_use_relative_reloc(false) |
| 6241 | && !gsym->is_from_dynobj() |
| 6242 | && !gsym->is_undefined() |
| 6243 | && !gsym->is_preemptible()) |
| 6244 | { |
| 6245 | // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC |
| 6246 | // symbol. This makes a function address in a PIE executable |
| 6247 | // match the address in a shared library that it links against. |
| 6248 | Reloc_section* rela_dyn = |
| 6249 | target->rela_irelative_section(layout); |
| 6250 | unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE; |
| 6251 | rela_dyn->add_symbolless_global_addend(gsym, r_type, |
| 6252 | output_section, object, |
| 6253 | data_shndx, |
| 6254 | rela.get_r_offset(), |
| 6255 | rela.get_r_addend()); |
| 6256 | } |
| 6257 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
| 6258 | && gsym->can_use_relative_reloc(false)) |
| 6259 | { |
| 6260 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6261 | rela_dyn->add_global_relative(gsym, |
| 6262 | elfcpp::R_AARCH64_RELATIVE, |
| 6263 | output_section, |
| 6264 | object, |
| 6265 | data_shndx, |
| 6266 | rela.get_r_offset(), |
| 6267 | rela.get_r_addend(), |
| 6268 | false); |
| 6269 | } |
| 6270 | else |
| 6271 | { |
| 6272 | check_non_pic(object, r_type); |
| 6273 | Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>* |
| 6274 | rela_dyn = target->rela_dyn_section(layout); |
| 6275 | rela_dyn->add_global( |
| 6276 | gsym, r_type, output_section, object, |
| 6277 | data_shndx, rela.get_r_offset(),rela.get_r_addend()); |
| 6278 | } |
| 6279 | } |
| 6280 | } |
| 6281 | break; |
| 6282 | |
| 6283 | case elfcpp::R_AARCH64_PREL16: |
| 6284 | case elfcpp::R_AARCH64_PREL32: |
| 6285 | case elfcpp::R_AARCH64_PREL64: |
| 6286 | // This is used to fill the GOT absolute address. |
| 6287 | if (gsym->needs_plt_entry()) |
| 6288 | { |
| 6289 | target->make_plt_entry(symtab, layout, gsym); |
| 6290 | } |
| 6291 | break; |
| 6292 | |
| 6293 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
| 6294 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 |
| 6295 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 |
| 6296 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 |
| 6297 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 |
| 6298 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 |
| 6299 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 |
| 6300 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 |
| 6301 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 |
| 6302 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
| 6303 | { |
| 6304 | if (gsym->needs_plt_entry()) |
| 6305 | target->make_plt_entry(symtab, layout, gsym); |
| 6306 | // Make a dynamic relocation if necessary. |
| 6307 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
| 6308 | { |
| 6309 | if (parameters->options().output_is_executable() |
| 6310 | && gsym->may_need_copy_reloc()) |
| 6311 | { |
| 6312 | target->copy_reloc(symtab, layout, object, |
| 6313 | data_shndx, output_section, gsym, rela); |
| 6314 | } |
| 6315 | } |
| 6316 | break; |
| 6317 | } |
| 6318 | |
| 6319 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 6320 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 6321 | { |
| 6322 | // This pair of relocations is used to access a specific GOT entry. |
| 6323 | // Note a GOT entry is an *address* to a symbol. |
| 6324 | // The symbol requires a GOT entry |
| 6325 | Output_data_got_aarch64<size, big_endian>* got = |
| 6326 | target->got_section(symtab, layout); |
| 6327 | if (gsym->final_value_is_known()) |
| 6328 | { |
| 6329 | // For a STT_GNU_IFUNC symbol we want the PLT address. |
| 6330 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) |
| 6331 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 6332 | else |
| 6333 | got->add_global(gsym, GOT_TYPE_STANDARD); |
| 6334 | } |
| 6335 | else |
| 6336 | { |
| 6337 | // If this symbol is not fully resolved, we need to add a dynamic |
| 6338 | // relocation for it. |
| 6339 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
| 6340 | |
| 6341 | // Use a GLOB_DAT rather than a RELATIVE reloc if: |
| 6342 | // |
| 6343 | // 1) The symbol may be defined in some other module. |
| 6344 | // 2) We are building a shared library and this is a protected |
| 6345 | // symbol; using GLOB_DAT means that the dynamic linker can use |
| 6346 | // the address of the PLT in the main executable when appropriate |
| 6347 | // so that function address comparisons work. |
| 6348 | // 3) This is a STT_GNU_IFUNC symbol in position dependent code, |
| 6349 | // again so that function address comparisons work. |
| 6350 | if (gsym->is_from_dynobj() |
| 6351 | || gsym->is_undefined() |
| 6352 | || gsym->is_preemptible() |
| 6353 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
| 6354 | && parameters->options().shared()) |
| 6355 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
| 6356 | && parameters->options().output_is_position_independent())) |
| 6357 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
| 6358 | rela_dyn, elfcpp::R_AARCH64_GLOB_DAT); |
| 6359 | else |
| 6360 | { |
| 6361 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
| 6362 | // offset into the GOT, so that function pointer |
| 6363 | // comparisons work correctly. |
| 6364 | bool is_new; |
| 6365 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) |
| 6366 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); |
| 6367 | else |
| 6368 | { |
| 6369 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); |
| 6370 | // Tell the dynamic linker to use the PLT address |
| 6371 | // when resolving relocations. |
| 6372 | if (gsym->is_from_dynobj() |
| 6373 | && !parameters->options().shared()) |
| 6374 | gsym->set_needs_dynsym_value(); |
| 6375 | } |
| 6376 | if (is_new) |
| 6377 | { |
| 6378 | rela_dyn->add_global_relative( |
| 6379 | gsym, elfcpp::R_AARCH64_RELATIVE, |
| 6380 | got, |
| 6381 | gsym->got_offset(GOT_TYPE_STANDARD), |
| 6382 | 0, |
| 6383 | false); |
| 6384 | } |
| 6385 | } |
| 6386 | } |
| 6387 | break; |
| 6388 | } |
| 6389 | |
| 6390 | case elfcpp::R_AARCH64_TSTBR14: |
| 6391 | case elfcpp::R_AARCH64_CONDBR19: |
| 6392 | case elfcpp::R_AARCH64_JUMP26: |
| 6393 | case elfcpp::R_AARCH64_CALL26: |
| 6394 | { |
| 6395 | if (gsym->final_value_is_known()) |
| 6396 | break; |
| 6397 | |
| 6398 | if (gsym->is_defined() && |
| 6399 | !gsym->is_from_dynobj() && |
| 6400 | !gsym->is_preemptible()) |
| 6401 | break; |
| 6402 | |
| 6403 | // Make plt entry for function call. |
| 6404 | target->make_plt_entry(symtab, layout, gsym); |
| 6405 | break; |
| 6406 | } |
| 6407 | |
| 6408 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 6409 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic |
| 6410 | { |
| 6411 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6412 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| 6413 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 6414 | { |
| 6415 | layout->set_has_static_tls(); |
| 6416 | break; |
| 6417 | } |
| 6418 | gold_assert(tlsopt == tls::TLSOPT_NONE); |
| 6419 | |
| 6420 | // General dynamic. |
| 6421 | Output_data_got_aarch64<size, big_endian>* got = |
| 6422 | target->got_section(symtab, layout); |
| 6423 | // Create 2 consecutive entries for module index and offset. |
| 6424 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
| 6425 | target->rela_dyn_section(layout), |
| 6426 | elfcpp::R_AARCH64_TLS_DTPMOD64, |
| 6427 | elfcpp::R_AARCH64_TLS_DTPREL64); |
| 6428 | } |
| 6429 | break; |
| 6430 | |
| 6431 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 6432 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local dynamic |
| 6433 | { |
| 6434 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6435 | optimize_tls_reloc(!parameters->options().shared(), r_type); |
| 6436 | if (tlsopt == tls::TLSOPT_NONE) |
| 6437 | { |
| 6438 | // Create a GOT entry for the module index. |
| 6439 | target->got_mod_index_entry(symtab, layout, object); |
| 6440 | } |
| 6441 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 6442 | unsupported_reloc_local(object, r_type); |
| 6443 | } |
| 6444 | break; |
| 6445 | |
| 6446 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 6447 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 6448 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 6449 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local dynamic |
| 6450 | break; |
| 6451 | |
| 6452 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 6453 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable |
| 6454 | { |
| 6455 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6456 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| 6457 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 6458 | break; |
| 6459 | |
| 6460 | layout->set_has_static_tls(); |
| 6461 | // Create a GOT entry for the tp-relative offset. |
| 6462 | Output_data_got_aarch64<size, big_endian>* got |
| 6463 | = target->got_section(symtab, layout); |
| 6464 | if (!parameters->doing_static_link()) |
| 6465 | { |
| 6466 | got->add_global_with_rel( |
| 6467 | gsym, GOT_TYPE_TLS_OFFSET, |
| 6468 | target->rela_dyn_section(layout), |
| 6469 | elfcpp::R_AARCH64_TLS_TPREL64); |
| 6470 | } |
| 6471 | if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)) |
| 6472 | { |
| 6473 | got->add_global(gsym, GOT_TYPE_TLS_OFFSET); |
| 6474 | unsigned int got_offset = |
| 6475 | gsym->got_offset(GOT_TYPE_TLS_OFFSET); |
| 6476 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6477 | gold_assert(addend == 0); |
| 6478 | got->add_static_reloc(got_offset, |
| 6479 | elfcpp::R_AARCH64_TLS_TPREL64, gsym); |
| 6480 | } |
| 6481 | } |
| 6482 | break; |
| 6483 | |
| 6484 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 6485 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 6486 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 6487 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 6488 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 6489 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 6490 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 6491 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: // Local executable |
| 6492 | layout->set_has_static_tls(); |
| 6493 | if (parameters->options().shared()) |
| 6494 | gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."), |
| 6495 | object->name().c_str(), r_type); |
| 6496 | break; |
| 6497 | |
| 6498 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 6499 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 6500 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor |
| 6501 | { |
| 6502 | target->define_tls_base_symbol(symtab, layout); |
| 6503 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 6504 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
| 6505 | if (tlsopt == tls::TLSOPT_NONE) |
| 6506 | { |
| 6507 | // Create reserved PLT and GOT entries for the resolver. |
| 6508 | target->reserve_tlsdesc_entries(symtab, layout); |
| 6509 | |
| 6510 | // Create a double GOT entry with an R_AARCH64_TLSDESC |
| 6511 | // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT |
| 6512 | // entry needs to be in an area in .got.plt, not .got. Call |
| 6513 | // got_section to make sure the section has been created. |
| 6514 | target->got_section(symtab, layout); |
| 6515 | Output_data_got<size, big_endian>* got = |
| 6516 | target->got_tlsdesc_section(); |
| 6517 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
| 6518 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
| 6519 | elfcpp::R_AARCH64_TLSDESC, 0); |
| 6520 | } |
| 6521 | else if (tlsopt == tls::TLSOPT_TO_IE) |
| 6522 | { |
| 6523 | // Create a GOT entry for the tp-relative offset. |
| 6524 | Output_data_got<size, big_endian>* got |
| 6525 | = target->got_section(symtab, layout); |
| 6526 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
| 6527 | target->rela_dyn_section(layout), |
| 6528 | elfcpp::R_AARCH64_TLS_TPREL64); |
| 6529 | } |
| 6530 | else if (tlsopt != tls::TLSOPT_TO_LE) |
| 6531 | unsupported_reloc_global(object, r_type, gsym); |
| 6532 | } |
| 6533 | break; |
| 6534 | |
| 6535 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 6536 | break; |
| 6537 | |
| 6538 | default: |
| 6539 | gold_error(_("%s: unsupported reloc type in global scan"), |
| 6540 | aarch64_reloc_property_table-> |
| 6541 | reloc_name_in_error_message(r_type).c_str()); |
| 6542 | } |
| 6543 | return; |
| 6544 | } // End of Scan::global |
| 6545 | |
| 6546 | |
| 6547 | // Create the PLT section. |
| 6548 | template<int size, bool big_endian> |
| 6549 | void |
| 6550 | Target_aarch64<size, big_endian>::make_plt_section( |
| 6551 | Symbol_table* symtab, Layout* layout) |
| 6552 | { |
| 6553 | if (this->plt_ == NULL) |
| 6554 | { |
| 6555 | // Create the GOT section first. |
| 6556 | this->got_section(symtab, layout); |
| 6557 | |
| 6558 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
| 6559 | this->got_irelative_); |
| 6560 | |
| 6561 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
| 6562 | (elfcpp::SHF_ALLOC |
| 6563 | | elfcpp::SHF_EXECINSTR), |
| 6564 | this->plt_, ORDER_PLT, false); |
| 6565 | |
| 6566 | // Make the sh_info field of .rela.plt point to .plt. |
| 6567 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); |
| 6568 | rela_plt_os->set_info_section(this->plt_->output_section()); |
| 6569 | } |
| 6570 | } |
| 6571 | |
| 6572 | // Return the section for TLSDESC relocations. |
| 6573 | |
| 6574 | template<int size, bool big_endian> |
| 6575 | typename Target_aarch64<size, big_endian>::Reloc_section* |
| 6576 | Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const |
| 6577 | { |
| 6578 | return this->plt_section()->rela_tlsdesc(layout); |
| 6579 | } |
| 6580 | |
| 6581 | // Create a PLT entry for a global symbol. |
| 6582 | |
| 6583 | template<int size, bool big_endian> |
| 6584 | void |
| 6585 | Target_aarch64<size, big_endian>::make_plt_entry( |
| 6586 | Symbol_table* symtab, |
| 6587 | Layout* layout, |
| 6588 | Symbol* gsym) |
| 6589 | { |
| 6590 | if (gsym->has_plt_offset()) |
| 6591 | return; |
| 6592 | |
| 6593 | if (this->plt_ == NULL) |
| 6594 | this->make_plt_section(symtab, layout); |
| 6595 | |
| 6596 | this->plt_->add_entry(symtab, layout, gsym); |
| 6597 | } |
| 6598 | |
| 6599 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
| 6600 | |
| 6601 | template<int size, bool big_endian> |
| 6602 | void |
| 6603 | Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry( |
| 6604 | Symbol_table* symtab, Layout* layout, |
| 6605 | Sized_relobj_file<size, big_endian>* relobj, |
| 6606 | unsigned int local_sym_index) |
| 6607 | { |
| 6608 | if (relobj->local_has_plt_offset(local_sym_index)) |
| 6609 | return; |
| 6610 | if (this->plt_ == NULL) |
| 6611 | this->make_plt_section(symtab, layout); |
| 6612 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
| 6613 | relobj, |
| 6614 | local_sym_index); |
| 6615 | relobj->set_local_plt_offset(local_sym_index, plt_offset); |
| 6616 | } |
| 6617 | |
| 6618 | template<int size, bool big_endian> |
| 6619 | void |
| 6620 | Target_aarch64<size, big_endian>::gc_process_relocs( |
| 6621 | Symbol_table* symtab, |
| 6622 | Layout* layout, |
| 6623 | Sized_relobj_file<size, big_endian>* object, |
| 6624 | unsigned int data_shndx, |
| 6625 | unsigned int sh_type, |
| 6626 | const unsigned char* prelocs, |
| 6627 | size_t reloc_count, |
| 6628 | Output_section* output_section, |
| 6629 | bool needs_special_offset_handling, |
| 6630 | size_t local_symbol_count, |
| 6631 | const unsigned char* plocal_symbols) |
| 6632 | { |
| 6633 | if (sh_type == elfcpp::SHT_REL) |
| 6634 | { |
| 6635 | return; |
| 6636 | } |
| 6637 | |
| 6638 | gold::gc_process_relocs< |
| 6639 | size, big_endian, |
| 6640 | Target_aarch64<size, big_endian>, |
| 6641 | elfcpp::SHT_RELA, |
| 6642 | typename Target_aarch64<size, big_endian>::Scan, |
| 6643 | typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>( |
| 6644 | symtab, |
| 6645 | layout, |
| 6646 | this, |
| 6647 | object, |
| 6648 | data_shndx, |
| 6649 | prelocs, |
| 6650 | reloc_count, |
| 6651 | output_section, |
| 6652 | needs_special_offset_handling, |
| 6653 | local_symbol_count, |
| 6654 | plocal_symbols); |
| 6655 | } |
| 6656 | |
| 6657 | // Scan relocations for a section. |
| 6658 | |
| 6659 | template<int size, bool big_endian> |
| 6660 | void |
| 6661 | Target_aarch64<size, big_endian>::scan_relocs( |
| 6662 | Symbol_table* symtab, |
| 6663 | Layout* layout, |
| 6664 | Sized_relobj_file<size, big_endian>* object, |
| 6665 | unsigned int data_shndx, |
| 6666 | unsigned int sh_type, |
| 6667 | const unsigned char* prelocs, |
| 6668 | size_t reloc_count, |
| 6669 | Output_section* output_section, |
| 6670 | bool needs_special_offset_handling, |
| 6671 | size_t local_symbol_count, |
| 6672 | const unsigned char* plocal_symbols) |
| 6673 | { |
| 6674 | if (sh_type == elfcpp::SHT_REL) |
| 6675 | { |
| 6676 | gold_error(_("%s: unsupported REL reloc section"), |
| 6677 | object->name().c_str()); |
| 6678 | return; |
| 6679 | } |
| 6680 | gold::scan_relocs<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, Scan>( |
| 6681 | symtab, |
| 6682 | layout, |
| 6683 | this, |
| 6684 | object, |
| 6685 | data_shndx, |
| 6686 | prelocs, |
| 6687 | reloc_count, |
| 6688 | output_section, |
| 6689 | needs_special_offset_handling, |
| 6690 | local_symbol_count, |
| 6691 | plocal_symbols); |
| 6692 | } |
| 6693 | |
| 6694 | // Return the value to use for a dynamic which requires special |
| 6695 | // treatment. This is how we support equality comparisons of function |
| 6696 | // pointers across shared library boundaries, as described in the |
| 6697 | // processor specific ABI supplement. |
| 6698 | |
| 6699 | template<int size, bool big_endian> |
| 6700 | uint64_t |
| 6701 | Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
| 6702 | { |
| 6703 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
| 6704 | return this->plt_address_for_global(gsym); |
| 6705 | } |
| 6706 | |
| 6707 | |
| 6708 | // Finalize the sections. |
| 6709 | |
| 6710 | template<int size, bool big_endian> |
| 6711 | void |
| 6712 | Target_aarch64<size, big_endian>::do_finalize_sections( |
| 6713 | Layout* layout, |
| 6714 | const Input_objects*, |
| 6715 | Symbol_table* symtab) |
| 6716 | { |
| 6717 | const Reloc_section* rel_plt = (this->plt_ == NULL |
| 6718 | ? NULL |
| 6719 | : this->plt_->rela_plt()); |
| 6720 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
| 6721 | this->rela_dyn_, true, false); |
| 6722 | |
| 6723 | // Emit any relocs we saved in an attempt to avoid generating COPY |
| 6724 | // relocs. |
| 6725 | if (this->copy_relocs_.any_saved_relocs()) |
| 6726 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); |
| 6727 | |
| 6728 | // Fill in some more dynamic tags. |
| 6729 | Output_data_dynamic* const odyn = layout->dynamic_data(); |
| 6730 | if (odyn != NULL) |
| 6731 | { |
| 6732 | if (this->plt_ != NULL |
| 6733 | && this->plt_->output_section() != NULL |
| 6734 | && this->plt_ ->has_tlsdesc_entry()) |
| 6735 | { |
| 6736 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
| 6737 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); |
| 6738 | this->got_->finalize_data_size(); |
| 6739 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, |
| 6740 | this->plt_, plt_offset); |
| 6741 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, |
| 6742 | this->got_, got_offset); |
| 6743 | } |
| 6744 | } |
| 6745 | |
| 6746 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of |
| 6747 | // the .got.plt section. |
| 6748 | Symbol* sym = this->global_offset_table_; |
| 6749 | if (sym != NULL) |
| 6750 | { |
| 6751 | uint64_t data_size = this->got_plt_->current_data_size(); |
| 6752 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
| 6753 | |
| 6754 | // If the .got section is more than 0x8000 bytes, we add |
| 6755 | // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16 |
| 6756 | // bit relocations have a greater chance of working. |
| 6757 | if (data_size >= 0x8000) |
| 6758 | symtab->get_sized_symbol<size>(sym)->set_value( |
| 6759 | symtab->get_sized_symbol<size>(sym)->value() + 0x8000); |
| 6760 | } |
| 6761 | |
| 6762 | if (parameters->doing_static_link() |
| 6763 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) |
| 6764 | { |
| 6765 | // If linking statically, make sure that the __rela_iplt symbols |
| 6766 | // were defined if necessary, even if we didn't create a PLT. |
| 6767 | static const Define_symbol_in_segment syms[] = |
| 6768 | { |
| 6769 | { |
| 6770 | "__rela_iplt_start", // name |
| 6771 | elfcpp::PT_LOAD, // segment_type |
| 6772 | elfcpp::PF_W, // segment_flags_set |
| 6773 | elfcpp::PF(0), // segment_flags_clear |
| 6774 | 0, // value |
| 6775 | 0, // size |
| 6776 | elfcpp::STT_NOTYPE, // type |
| 6777 | elfcpp::STB_GLOBAL, // binding |
| 6778 | elfcpp::STV_HIDDEN, // visibility |
| 6779 | 0, // nonvis |
| 6780 | Symbol::SEGMENT_START, // offset_from_base |
| 6781 | true // only_if_ref |
| 6782 | }, |
| 6783 | { |
| 6784 | "__rela_iplt_end", // name |
| 6785 | elfcpp::PT_LOAD, // segment_type |
| 6786 | elfcpp::PF_W, // segment_flags_set |
| 6787 | elfcpp::PF(0), // segment_flags_clear |
| 6788 | 0, // value |
| 6789 | 0, // size |
| 6790 | elfcpp::STT_NOTYPE, // type |
| 6791 | elfcpp::STB_GLOBAL, // binding |
| 6792 | elfcpp::STV_HIDDEN, // visibility |
| 6793 | 0, // nonvis |
| 6794 | Symbol::SEGMENT_START, // offset_from_base |
| 6795 | true // only_if_ref |
| 6796 | } |
| 6797 | }; |
| 6798 | |
| 6799 | symtab->define_symbols(layout, 2, syms, |
| 6800 | layout->script_options()->saw_sections_clause()); |
| 6801 | } |
| 6802 | |
| 6803 | return; |
| 6804 | } |
| 6805 | |
| 6806 | // Perform a relocation. |
| 6807 | |
| 6808 | template<int size, bool big_endian> |
| 6809 | inline bool |
| 6810 | Target_aarch64<size, big_endian>::Relocate::relocate( |
| 6811 | const Relocate_info<size, big_endian>* relinfo, |
| 6812 | Target_aarch64<size, big_endian>* target, |
| 6813 | Output_section* , |
| 6814 | size_t relnum, |
| 6815 | const elfcpp::Rela<size, big_endian>& rela, |
| 6816 | unsigned int r_type, |
| 6817 | const Sized_symbol<size>* gsym, |
| 6818 | const Symbol_value<size>* psymval, |
| 6819 | unsigned char* view, |
| 6820 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 6821 | section_size_type /* view_size */) |
| 6822 | { |
| 6823 | if (view == NULL) |
| 6824 | return true; |
| 6825 | |
| 6826 | typedef AArch64_relocate_functions<size, big_endian> Reloc; |
| 6827 | |
| 6828 | const AArch64_reloc_property* reloc_property = |
| 6829 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 6830 | |
| 6831 | if (reloc_property == NULL) |
| 6832 | { |
| 6833 | std::string reloc_name = |
| 6834 | aarch64_reloc_property_table->reloc_name_in_error_message(r_type); |
| 6835 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 6836 | _("cannot relocate %s in object file"), |
| 6837 | reloc_name.c_str()); |
| 6838 | return true; |
| 6839 | } |
| 6840 | |
| 6841 | const Sized_relobj_file<size, big_endian>* object = relinfo->object; |
| 6842 | |
| 6843 | // Pick the value to use for symbols defined in the PLT. |
| 6844 | Symbol_value<size> symval; |
| 6845 | if (gsym != NULL |
| 6846 | && gsym->use_plt_offset(reloc_property->reference_flags())) |
| 6847 | { |
| 6848 | symval.set_output_value(target->plt_address_for_global(gsym)); |
| 6849 | psymval = &symval; |
| 6850 | } |
| 6851 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
| 6852 | { |
| 6853 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 6854 | if (object->local_has_plt_offset(r_sym)) |
| 6855 | { |
| 6856 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
| 6857 | psymval = &symval; |
| 6858 | } |
| 6859 | } |
| 6860 | |
| 6861 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 6862 | |
| 6863 | // Get the GOT offset if needed. |
| 6864 | // For aarch64, the GOT pointer points to the start of the GOT section. |
| 6865 | bool have_got_offset = false; |
| 6866 | int got_offset = 0; |
| 6867 | int got_base = (target->got_ != NULL |
| 6868 | ? (target->got_->current_data_size() >= 0x8000 |
| 6869 | ? 0x8000 : 0) |
| 6870 | : 0); |
| 6871 | switch (r_type) |
| 6872 | { |
| 6873 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0: |
| 6874 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC: |
| 6875 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1: |
| 6876 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC: |
| 6877 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2: |
| 6878 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC: |
| 6879 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G3: |
| 6880 | case elfcpp::R_AARCH64_GOTREL64: |
| 6881 | case elfcpp::R_AARCH64_GOTREL32: |
| 6882 | case elfcpp::R_AARCH64_GOT_LD_PREL19: |
| 6883 | case elfcpp::R_AARCH64_LD64_GOTOFF_LO15: |
| 6884 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 6885 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 6886 | case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15: |
| 6887 | if (gsym != NULL) |
| 6888 | { |
| 6889 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
| 6890 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base; |
| 6891 | } |
| 6892 | else |
| 6893 | { |
| 6894 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 6895 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
| 6896 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) |
| 6897 | - got_base); |
| 6898 | } |
| 6899 | have_got_offset = true; |
| 6900 | break; |
| 6901 | |
| 6902 | default: |
| 6903 | break; |
| 6904 | } |
| 6905 | |
| 6906 | typename Reloc::Status reloc_status = Reloc::STATUS_OKAY; |
| 6907 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
| 6908 | switch (r_type) |
| 6909 | { |
| 6910 | case elfcpp::R_AARCH64_NONE: |
| 6911 | break; |
| 6912 | |
| 6913 | case elfcpp::R_AARCH64_ABS64: |
| 6914 | reloc_status = Reloc::template rela_ua<64>( |
| 6915 | view, object, psymval, addend, reloc_property); |
| 6916 | break; |
| 6917 | |
| 6918 | case elfcpp::R_AARCH64_ABS32: |
| 6919 | reloc_status = Reloc::template rela_ua<32>( |
| 6920 | view, object, psymval, addend, reloc_property); |
| 6921 | break; |
| 6922 | |
| 6923 | case elfcpp::R_AARCH64_ABS16: |
| 6924 | reloc_status = Reloc::template rela_ua<16>( |
| 6925 | view, object, psymval, addend, reloc_property); |
| 6926 | break; |
| 6927 | |
| 6928 | case elfcpp::R_AARCH64_PREL64: |
| 6929 | reloc_status = Reloc::template pcrela_ua<64>( |
| 6930 | view, object, psymval, addend, address, reloc_property); |
| 6931 | break; |
| 6932 | |
| 6933 | case elfcpp::R_AARCH64_PREL32: |
| 6934 | reloc_status = Reloc::template pcrela_ua<32>( |
| 6935 | view, object, psymval, addend, address, reloc_property); |
| 6936 | break; |
| 6937 | |
| 6938 | case elfcpp::R_AARCH64_PREL16: |
| 6939 | reloc_status = Reloc::template pcrela_ua<16>( |
| 6940 | view, object, psymval, addend, address, reloc_property); |
| 6941 | break; |
| 6942 | |
| 6943 | case elfcpp::R_AARCH64_LD_PREL_LO19: |
| 6944 | reloc_status = Reloc::template pcrela_general<32>( |
| 6945 | view, object, psymval, addend, address, reloc_property); |
| 6946 | break; |
| 6947 | |
| 6948 | case elfcpp::R_AARCH64_ADR_PREL_LO21: |
| 6949 | reloc_status = Reloc::adr(view, object, psymval, addend, |
| 6950 | address, reloc_property); |
| 6951 | break; |
| 6952 | |
| 6953 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: |
| 6954 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: |
| 6955 | reloc_status = Reloc::adrp(view, object, psymval, addend, address, |
| 6956 | reloc_property); |
| 6957 | break; |
| 6958 | |
| 6959 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: |
| 6960 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: |
| 6961 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: |
| 6962 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: |
| 6963 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: |
| 6964 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: |
| 6965 | reloc_status = Reloc::template rela_general<32>( |
| 6966 | view, object, psymval, addend, reloc_property); |
| 6967 | break; |
| 6968 | |
| 6969 | case elfcpp::R_AARCH64_CALL26: |
| 6970 | if (this->skip_call_tls_get_addr_) |
| 6971 | { |
| 6972 | // Double check that the TLSGD insn has been optimized away. |
| 6973 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 6974 | Insntype insn = elfcpp::Swap<32, big_endian>::readval( |
| 6975 | reinterpret_cast<Insntype*>(view)); |
| 6976 | gold_assert((insn & 0xff000000) == 0x91000000); |
| 6977 | |
| 6978 | reloc_status = Reloc::STATUS_OKAY; |
| 6979 | this->skip_call_tls_get_addr_ = false; |
| 6980 | // Return false to stop further processing this reloc. |
| 6981 | return false; |
| 6982 | } |
| 6983 | // Fallthrough |
| 6984 | case elfcpp::R_AARCH64_JUMP26: |
| 6985 | if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address, |
| 6986 | gsym, psymval, object, |
| 6987 | target->stub_group_size_)) |
| 6988 | break; |
| 6989 | // Fallthrough |
| 6990 | case elfcpp::R_AARCH64_TSTBR14: |
| 6991 | case elfcpp::R_AARCH64_CONDBR19: |
| 6992 | reloc_status = Reloc::template pcrela_general<32>( |
| 6993 | view, object, psymval, addend, address, reloc_property); |
| 6994 | break; |
| 6995 | |
| 6996 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: |
| 6997 | gold_assert(have_got_offset); |
| 6998 | value = target->got_->address() + got_base + got_offset; |
| 6999 | reloc_status = Reloc::adrp(view, value + addend, address); |
| 7000 | break; |
| 7001 | |
| 7002 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: |
| 7003 | gold_assert(have_got_offset); |
| 7004 | value = target->got_->address() + got_base + got_offset; |
| 7005 | reloc_status = Reloc::template rela_general<32>( |
| 7006 | view, value, addend, reloc_property); |
| 7007 | break; |
| 7008 | |
| 7009 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 7010 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 7011 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 7012 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 7013 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 7014 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 7015 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 7016 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 7017 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 7018 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 7019 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 7020 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 7021 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 7022 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 7023 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 7024 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 7025 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 7026 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 7027 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 7028 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 7029 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 7030 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 7031 | reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type, |
| 7032 | gsym, psymval, view, address); |
| 7033 | break; |
| 7034 | |
| 7035 | // These are dynamic relocations, which are unexpected when linking. |
| 7036 | case elfcpp::R_AARCH64_COPY: |
| 7037 | case elfcpp::R_AARCH64_GLOB_DAT: |
| 7038 | case elfcpp::R_AARCH64_JUMP_SLOT: |
| 7039 | case elfcpp::R_AARCH64_RELATIVE: |
| 7040 | case elfcpp::R_AARCH64_IRELATIVE: |
| 7041 | case elfcpp::R_AARCH64_TLS_DTPREL64: |
| 7042 | case elfcpp::R_AARCH64_TLS_DTPMOD64: |
| 7043 | case elfcpp::R_AARCH64_TLS_TPREL64: |
| 7044 | case elfcpp::R_AARCH64_TLSDESC: |
| 7045 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7046 | _("unexpected reloc %u in object file"), |
| 7047 | r_type); |
| 7048 | break; |
| 7049 | |
| 7050 | default: |
| 7051 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7052 | _("unsupported reloc %s"), |
| 7053 | reloc_property->name().c_str()); |
| 7054 | break; |
| 7055 | } |
| 7056 | |
| 7057 | // Report any errors. |
| 7058 | switch (reloc_status) |
| 7059 | { |
| 7060 | case Reloc::STATUS_OKAY: |
| 7061 | break; |
| 7062 | case Reloc::STATUS_OVERFLOW: |
| 7063 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7064 | _("relocation overflow in %s"), |
| 7065 | reloc_property->name().c_str()); |
| 7066 | break; |
| 7067 | case Reloc::STATUS_BAD_RELOC: |
| 7068 | gold_error_at_location( |
| 7069 | relinfo, |
| 7070 | relnum, |
| 7071 | rela.get_r_offset(), |
| 7072 | _("unexpected opcode while processing relocation %s"), |
| 7073 | reloc_property->name().c_str()); |
| 7074 | break; |
| 7075 | default: |
| 7076 | gold_unreachable(); |
| 7077 | } |
| 7078 | |
| 7079 | return true; |
| 7080 | } |
| 7081 | |
| 7082 | |
| 7083 | template<int size, bool big_endian> |
| 7084 | inline |
| 7085 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 7086 | Target_aarch64<size, big_endian>::Relocate::relocate_tls( |
| 7087 | const Relocate_info<size, big_endian>* relinfo, |
| 7088 | Target_aarch64<size, big_endian>* target, |
| 7089 | size_t relnum, |
| 7090 | const elfcpp::Rela<size, big_endian>& rela, |
| 7091 | unsigned int r_type, const Sized_symbol<size>* gsym, |
| 7092 | const Symbol_value<size>* psymval, |
| 7093 | unsigned char* view, |
| 7094 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 7095 | { |
| 7096 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 7097 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 7098 | |
| 7099 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 7100 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 7101 | const AArch64_reloc_property* reloc_property = |
| 7102 | aarch64_reloc_property_table->get_reloc_property(r_type); |
| 7103 | gold_assert(reloc_property != NULL); |
| 7104 | |
| 7105 | const bool is_final = (gsym == NULL |
| 7106 | ? !parameters->options().shared() |
| 7107 | : gsym->final_value_is_known()); |
| 7108 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
| 7109 | optimize_tls_reloc(is_final, r_type); |
| 7110 | |
| 7111 | Sized_relobj_file<size, big_endian>* object = relinfo->object; |
| 7112 | int tls_got_offset_type; |
| 7113 | switch (r_type) |
| 7114 | { |
| 7115 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 7116 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic |
| 7117 | { |
| 7118 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 7119 | { |
| 7120 | if (tls_segment == NULL) |
| 7121 | { |
| 7122 | gold_assert(parameters->errors()->error_count() > 0 |
| 7123 | || issue_undefined_symbol_error(gsym)); |
| 7124 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7125 | } |
| 7126 | return tls_gd_to_le(relinfo, target, rela, r_type, view, |
| 7127 | psymval); |
| 7128 | } |
| 7129 | else if (tlsopt == tls::TLSOPT_NONE) |
| 7130 | { |
| 7131 | tls_got_offset_type = GOT_TYPE_TLS_PAIR; |
| 7132 | // Firstly get the address for the got entry. |
| 7133 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 7134 | if (gsym != NULL) |
| 7135 | { |
| 7136 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| 7137 | got_entry_address = target->got_->address() + |
| 7138 | gsym->got_offset(tls_got_offset_type); |
| 7139 | } |
| 7140 | else |
| 7141 | { |
| 7142 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7143 | gold_assert( |
| 7144 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| 7145 | got_entry_address = target->got_->address() + |
| 7146 | object->local_got_offset(r_sym, tls_got_offset_type); |
| 7147 | } |
| 7148 | |
| 7149 | // Relocate the address into adrp/ld, adrp/add pair. |
| 7150 | switch (r_type) |
| 7151 | { |
| 7152 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
| 7153 | return aarch64_reloc_funcs::adrp( |
| 7154 | view, got_entry_address + addend, address); |
| 7155 | |
| 7156 | break; |
| 7157 | |
| 7158 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: |
| 7159 | return aarch64_reloc_funcs::template rela_general<32>( |
| 7160 | view, got_entry_address, addend, reloc_property); |
| 7161 | break; |
| 7162 | |
| 7163 | default: |
| 7164 | gold_unreachable(); |
| 7165 | } |
| 7166 | } |
| 7167 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
| 7168 | _("unsupported gd_to_ie relaxation on %u"), |
| 7169 | r_type); |
| 7170 | } |
| 7171 | break; |
| 7172 | |
| 7173 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 7174 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local-dynamic |
| 7175 | { |
| 7176 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 7177 | { |
| 7178 | if (tls_segment == NULL) |
| 7179 | { |
| 7180 | gold_assert(parameters->errors()->error_count() > 0 |
| 7181 | || issue_undefined_symbol_error(gsym)); |
| 7182 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7183 | } |
| 7184 | return this->tls_ld_to_le(relinfo, target, rela, r_type, view, |
| 7185 | psymval); |
| 7186 | } |
| 7187 | |
| 7188 | gold_assert(tlsopt == tls::TLSOPT_NONE); |
| 7189 | // Relocate the field with the offset of the GOT entry for |
| 7190 | // the module index. |
| 7191 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 7192 | got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) + |
| 7193 | target->got_->address()); |
| 7194 | |
| 7195 | switch (r_type) |
| 7196 | { |
| 7197 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
| 7198 | return aarch64_reloc_funcs::adrp( |
| 7199 | view, got_entry_address + addend, address); |
| 7200 | break; |
| 7201 | |
| 7202 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: |
| 7203 | return aarch64_reloc_funcs::template rela_general<32>( |
| 7204 | view, got_entry_address, addend, reloc_property); |
| 7205 | break; |
| 7206 | |
| 7207 | default: |
| 7208 | gold_unreachable(); |
| 7209 | } |
| 7210 | } |
| 7211 | break; |
| 7212 | |
| 7213 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 7214 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 7215 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 7216 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local-dynamic |
| 7217 | { |
| 7218 | AArch64_address value = psymval->value(object, 0); |
| 7219 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 7220 | { |
| 7221 | if (tls_segment == NULL) |
| 7222 | { |
| 7223 | gold_assert(parameters->errors()->error_count() > 0 |
| 7224 | || issue_undefined_symbol_error(gsym)); |
| 7225 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7226 | } |
| 7227 | } |
| 7228 | switch (r_type) |
| 7229 | { |
| 7230 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: |
| 7231 | return aarch64_reloc_funcs::movnz(view, value + addend, |
| 7232 | reloc_property); |
| 7233 | break; |
| 7234 | |
| 7235 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
| 7236 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
| 7237 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: |
| 7238 | return aarch64_reloc_funcs::template rela_general<32>( |
| 7239 | view, value, addend, reloc_property); |
| 7240 | break; |
| 7241 | |
| 7242 | default: |
| 7243 | gold_unreachable(); |
| 7244 | } |
| 7245 | // We should never reach here. |
| 7246 | } |
| 7247 | break; |
| 7248 | |
| 7249 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 7250 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec |
| 7251 | { |
| 7252 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 7253 | { |
| 7254 | if (tls_segment == NULL) |
| 7255 | { |
| 7256 | gold_assert(parameters->errors()->error_count() > 0 |
| 7257 | || issue_undefined_symbol_error(gsym)); |
| 7258 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7259 | } |
| 7260 | return tls_ie_to_le(relinfo, target, rela, r_type, view, |
| 7261 | psymval); |
| 7262 | } |
| 7263 | tls_got_offset_type = GOT_TYPE_TLS_OFFSET; |
| 7264 | |
| 7265 | // Firstly get the address for the got entry. |
| 7266 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 7267 | if (gsym != NULL) |
| 7268 | { |
| 7269 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| 7270 | got_entry_address = target->got_->address() + |
| 7271 | gsym->got_offset(tls_got_offset_type); |
| 7272 | } |
| 7273 | else |
| 7274 | { |
| 7275 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7276 | gold_assert( |
| 7277 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| 7278 | got_entry_address = target->got_->address() + |
| 7279 | object->local_got_offset(r_sym, tls_got_offset_type); |
| 7280 | } |
| 7281 | // Relocate the address into adrp/ld, adrp/add pair. |
| 7282 | switch (r_type) |
| 7283 | { |
| 7284 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
| 7285 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, |
| 7286 | address); |
| 7287 | break; |
| 7288 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: |
| 7289 | return aarch64_reloc_funcs::template rela_general<32>( |
| 7290 | view, got_entry_address, addend, reloc_property); |
| 7291 | default: |
| 7292 | gold_unreachable(); |
| 7293 | } |
| 7294 | } |
| 7295 | // We shall never reach here. |
| 7296 | break; |
| 7297 | |
| 7298 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 7299 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 7300 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: |
| 7301 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 7302 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: |
| 7303 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
| 7304 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: |
| 7305 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: |
| 7306 | { |
| 7307 | gold_assert(tls_segment != NULL); |
| 7308 | AArch64_address value = psymval->value(object, 0); |
| 7309 | |
| 7310 | if (!parameters->options().shared()) |
| 7311 | { |
| 7312 | AArch64_address aligned_tcb_size = |
| 7313 | align_address(target->tcb_size(), |
| 7314 | tls_segment->maximum_alignment()); |
| 7315 | value += aligned_tcb_size; |
| 7316 | switch (r_type) |
| 7317 | { |
| 7318 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
| 7319 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: |
| 7320 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: |
| 7321 | return aarch64_reloc_funcs::movnz(view, value + addend, |
| 7322 | reloc_property); |
| 7323 | default: |
| 7324 | return aarch64_reloc_funcs::template |
| 7325 | rela_general<32>(view, |
| 7326 | value, |
| 7327 | addend, |
| 7328 | reloc_property); |
| 7329 | } |
| 7330 | } |
| 7331 | else |
| 7332 | gold_error(_("%s: unsupported reloc %u " |
| 7333 | "in non-static TLSLE mode."), |
| 7334 | object->name().c_str(), r_type); |
| 7335 | } |
| 7336 | break; |
| 7337 | |
| 7338 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 7339 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 7340 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 7341 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 7342 | { |
| 7343 | if (tlsopt == tls::TLSOPT_TO_LE) |
| 7344 | { |
| 7345 | if (tls_segment == NULL) |
| 7346 | { |
| 7347 | gold_assert(parameters->errors()->error_count() > 0 |
| 7348 | || issue_undefined_symbol_error(gsym)); |
| 7349 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7350 | } |
| 7351 | return tls_desc_gd_to_le(relinfo, target, rela, r_type, |
| 7352 | view, psymval); |
| 7353 | } |
| 7354 | else |
| 7355 | { |
| 7356 | tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE |
| 7357 | ? GOT_TYPE_TLS_OFFSET |
| 7358 | : GOT_TYPE_TLS_DESC); |
| 7359 | unsigned int got_tlsdesc_offset = 0; |
| 7360 | if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL |
| 7361 | && tlsopt == tls::TLSOPT_NONE) |
| 7362 | { |
| 7363 | // We created GOT entries in the .got.tlsdesc portion of the |
| 7364 | // .got.plt section, but the offset stored in the symbol is the |
| 7365 | // offset within .got.tlsdesc. |
| 7366 | got_tlsdesc_offset = (target->got_->data_size() |
| 7367 | + target->got_plt_section()->data_size()); |
| 7368 | } |
| 7369 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
| 7370 | if (gsym != NULL) |
| 7371 | { |
| 7372 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
| 7373 | got_entry_address = target->got_->address() |
| 7374 | + got_tlsdesc_offset |
| 7375 | + gsym->got_offset(tls_got_offset_type); |
| 7376 | } |
| 7377 | else |
| 7378 | { |
| 7379 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
| 7380 | gold_assert( |
| 7381 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
| 7382 | got_entry_address = target->got_->address() + |
| 7383 | got_tlsdesc_offset + |
| 7384 | object->local_got_offset(r_sym, tls_got_offset_type); |
| 7385 | } |
| 7386 | if (tlsopt == tls::TLSOPT_TO_IE) |
| 7387 | { |
| 7388 | if (tls_segment == NULL) |
| 7389 | { |
| 7390 | gold_assert(parameters->errors()->error_count() > 0 |
| 7391 | || issue_undefined_symbol_error(gsym)); |
| 7392 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7393 | } |
| 7394 | return tls_desc_gd_to_ie(relinfo, target, rela, r_type, |
| 7395 | view, psymval, got_entry_address, |
| 7396 | address); |
| 7397 | } |
| 7398 | |
| 7399 | // Now do tlsdesc relocation. |
| 7400 | switch (r_type) |
| 7401 | { |
| 7402 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 7403 | return aarch64_reloc_funcs::adrp(view, |
| 7404 | got_entry_address + addend, |
| 7405 | address); |
| 7406 | break; |
| 7407 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 7408 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 7409 | return aarch64_reloc_funcs::template rela_general<32>( |
| 7410 | view, got_entry_address, addend, reloc_property); |
| 7411 | break; |
| 7412 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 7413 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 7414 | break; |
| 7415 | default: |
| 7416 | gold_unreachable(); |
| 7417 | } |
| 7418 | } |
| 7419 | } |
| 7420 | break; |
| 7421 | |
| 7422 | default: |
| 7423 | gold_error(_("%s: unsupported TLS reloc %u."), |
| 7424 | object->name().c_str(), r_type); |
| 7425 | } |
| 7426 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7427 | } // End of relocate_tls. |
| 7428 | |
| 7429 | |
| 7430 | template<int size, bool big_endian> |
| 7431 | inline |
| 7432 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 7433 | Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le( |
| 7434 | const Relocate_info<size, big_endian>* relinfo, |
| 7435 | Target_aarch64<size, big_endian>* target, |
| 7436 | const elfcpp::Rela<size, big_endian>& rela, |
| 7437 | unsigned int r_type, |
| 7438 | unsigned char* view, |
| 7439 | const Symbol_value<size>* psymval) |
| 7440 | { |
| 7441 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 7442 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 7443 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 7444 | |
| 7445 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 7446 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); |
| 7447 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); |
| 7448 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); |
| 7449 | |
| 7450 | if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC) |
| 7451 | { |
| 7452 | // This is the 2nd relocs, optimization should already have been |
| 7453 | // done. |
| 7454 | gold_assert((insn1 & 0xfff00000) == 0x91400000); |
| 7455 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 7456 | } |
| 7457 | |
| 7458 | // The original sequence is - |
| 7459 | // 90000000 adrp x0, 0 <main> |
| 7460 | // 91000000 add x0, x0, #0x0 |
| 7461 | // 94000000 bl 0 <__tls_get_addr> |
| 7462 | // optimized to sequence - |
| 7463 | // d53bd040 mrs x0, tpidr_el0 |
| 7464 | // 91400000 add x0, x0, #0x0, lsl #12 |
| 7465 | // 91000000 add x0, x0, #0x0 |
| 7466 | |
| 7467 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we |
| 7468 | // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we |
| 7469 | // have to change "bl tls_get_addr", which does not have a corresponding tls |
| 7470 | // relocation type. So before proceeding, we need to make sure compiler |
| 7471 | // does not change the sequence. |
| 7472 | if(!(insn1 == 0x90000000 // adrp x0,0 |
| 7473 | && insn2 == 0x91000000 // add x0, x0, #0x0 |
| 7474 | && insn3 == 0x94000000)) // bl 0 |
| 7475 | { |
| 7476 | // Ideally we should give up gd_to_le relaxation and do gd access. |
| 7477 | // However the gd_to_le relaxation decision has been made early |
| 7478 | // in the scan stage, where we did not allocate any GOT entry for |
| 7479 | // this symbol. Therefore we have to exit and report error now. |
| 7480 | gold_error(_("unexpected reloc insn sequence while relaxing " |
| 7481 | "tls gd to le for reloc %u."), r_type); |
| 7482 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7483 | } |
| 7484 | |
| 7485 | // Write new insns. |
| 7486 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 |
| 7487 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 |
| 7488 | insn3 = 0x91000000; // add x0, x0, #0x0 |
| 7489 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); |
| 7490 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); |
| 7491 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); |
| 7492 | |
| 7493 | // Calculate tprel value. |
| 7494 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 7495 | gold_assert(tls_segment != NULL); |
| 7496 | AArch64_address value = psymval->value(relinfo->object, 0); |
| 7497 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 7498 | AArch64_address aligned_tcb_size = |
| 7499 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 7500 | AArch64_address x = value + aligned_tcb_size; |
| 7501 | |
| 7502 | // After new insns are written, apply TLSLE relocs. |
| 7503 | const AArch64_reloc_property* rp1 = |
| 7504 | aarch64_reloc_property_table->get_reloc_property( |
| 7505 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); |
| 7506 | const AArch64_reloc_property* rp2 = |
| 7507 | aarch64_reloc_property_table->get_reloc_property( |
| 7508 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); |
| 7509 | gold_assert(rp1 != NULL && rp2 != NULL); |
| 7510 | |
| 7511 | typename aarch64_reloc_funcs::Status s1 = |
| 7512 | aarch64_reloc_funcs::template rela_general<32>(view + 4, |
| 7513 | x, |
| 7514 | addend, |
| 7515 | rp1); |
| 7516 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) |
| 7517 | return s1; |
| 7518 | |
| 7519 | typename aarch64_reloc_funcs::Status s2 = |
| 7520 | aarch64_reloc_funcs::template rela_general<32>(view + 8, |
| 7521 | x, |
| 7522 | addend, |
| 7523 | rp2); |
| 7524 | |
| 7525 | this->skip_call_tls_get_addr_ = true; |
| 7526 | return s2; |
| 7527 | } // End of tls_gd_to_le |
| 7528 | |
| 7529 | |
| 7530 | template<int size, bool big_endian> |
| 7531 | inline |
| 7532 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 7533 | Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le( |
| 7534 | const Relocate_info<size, big_endian>* relinfo, |
| 7535 | Target_aarch64<size, big_endian>* target, |
| 7536 | const elfcpp::Rela<size, big_endian>& rela, |
| 7537 | unsigned int r_type, |
| 7538 | unsigned char* view, |
| 7539 | const Symbol_value<size>* psymval) |
| 7540 | { |
| 7541 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 7542 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 7543 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 7544 | |
| 7545 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 7546 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); |
| 7547 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); |
| 7548 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); |
| 7549 | |
| 7550 | if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC) |
| 7551 | { |
| 7552 | // This is the 2nd relocs, optimization should already have been |
| 7553 | // done. |
| 7554 | gold_assert((insn1 & 0xfff00000) == 0x91400000); |
| 7555 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 7556 | } |
| 7557 | |
| 7558 | // The original sequence is - |
| 7559 | // 90000000 adrp x0, 0 <main> |
| 7560 | // 91000000 add x0, x0, #0x0 |
| 7561 | // 94000000 bl 0 <__tls_get_addr> |
| 7562 | // optimized to sequence - |
| 7563 | // d53bd040 mrs x0, tpidr_el0 |
| 7564 | // 91400000 add x0, x0, #0x0, lsl #12 |
| 7565 | // 91000000 add x0, x0, #0x0 |
| 7566 | |
| 7567 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we |
| 7568 | // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we |
| 7569 | // have to change "bl tls_get_addr", which does not have a corresponding tls |
| 7570 | // relocation type. So before proceeding, we need to make sure compiler |
| 7571 | // does not change the sequence. |
| 7572 | if(!(insn1 == 0x90000000 // adrp x0,0 |
| 7573 | && insn2 == 0x91000000 // add x0, x0, #0x0 |
| 7574 | && insn3 == 0x94000000)) // bl 0 |
| 7575 | { |
| 7576 | // Ideally we should give up gd_to_le relaxation and do gd access. |
| 7577 | // However the gd_to_le relaxation decision has been made early |
| 7578 | // in the scan stage, where we did not allocate any GOT entry for |
| 7579 | // this symbol. Therefore we have to exit and report error now. |
| 7580 | gold_error(_("unexpected reloc insn sequence while relaxing " |
| 7581 | "tls gd to le for reloc %u."), r_type); |
| 7582 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7583 | } |
| 7584 | |
| 7585 | // Write new insns. |
| 7586 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 |
| 7587 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 |
| 7588 | insn3 = 0x91000000; // add x0, x0, #0x0 |
| 7589 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); |
| 7590 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); |
| 7591 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); |
| 7592 | |
| 7593 | // Calculate tprel value. |
| 7594 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 7595 | gold_assert(tls_segment != NULL); |
| 7596 | AArch64_address value = psymval->value(relinfo->object, 0); |
| 7597 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 7598 | AArch64_address aligned_tcb_size = |
| 7599 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 7600 | AArch64_address x = value + aligned_tcb_size; |
| 7601 | |
| 7602 | // After new insns are written, apply TLSLE relocs. |
| 7603 | const AArch64_reloc_property* rp1 = |
| 7604 | aarch64_reloc_property_table->get_reloc_property( |
| 7605 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); |
| 7606 | const AArch64_reloc_property* rp2 = |
| 7607 | aarch64_reloc_property_table->get_reloc_property( |
| 7608 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); |
| 7609 | gold_assert(rp1 != NULL && rp2 != NULL); |
| 7610 | |
| 7611 | typename aarch64_reloc_funcs::Status s1 = |
| 7612 | aarch64_reloc_funcs::template rela_general<32>(view + 4, |
| 7613 | x, |
| 7614 | addend, |
| 7615 | rp1); |
| 7616 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) |
| 7617 | return s1; |
| 7618 | |
| 7619 | typename aarch64_reloc_funcs::Status s2 = |
| 7620 | aarch64_reloc_funcs::template rela_general<32>(view + 8, |
| 7621 | x, |
| 7622 | addend, |
| 7623 | rp2); |
| 7624 | |
| 7625 | this->skip_call_tls_get_addr_ = true; |
| 7626 | return s2; |
| 7627 | |
| 7628 | } // End of tls_ld_to_le |
| 7629 | |
| 7630 | template<int size, bool big_endian> |
| 7631 | inline |
| 7632 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 7633 | Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le( |
| 7634 | const Relocate_info<size, big_endian>* relinfo, |
| 7635 | Target_aarch64<size, big_endian>* target, |
| 7636 | const elfcpp::Rela<size, big_endian>& rela, |
| 7637 | unsigned int r_type, |
| 7638 | unsigned char* view, |
| 7639 | const Symbol_value<size>* psymval) |
| 7640 | { |
| 7641 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 7642 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 7643 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 7644 | |
| 7645 | AArch64_address value = psymval->value(relinfo->object, 0); |
| 7646 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 7647 | AArch64_address aligned_tcb_address = |
| 7648 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 7649 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 7650 | AArch64_address x = value + addend + aligned_tcb_address; |
| 7651 | // "x" is the offset to tp, we can only do this if x is within |
| 7652 | // range [0, 2^32-1] |
| 7653 | if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0))) |
| 7654 | { |
| 7655 | gold_error(_("TLS variable referred by reloc %u is too far from TP."), |
| 7656 | r_type); |
| 7657 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7658 | } |
| 7659 | |
| 7660 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 7661 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); |
| 7662 | unsigned int regno; |
| 7663 | Insntype newinsn; |
| 7664 | if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21) |
| 7665 | { |
| 7666 | // Generate movz. |
| 7667 | regno = (insn & 0x1f); |
| 7668 | newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5); |
| 7669 | } |
| 7670 | else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC) |
| 7671 | { |
| 7672 | // Generate movk. |
| 7673 | regno = (insn & 0x1f); |
| 7674 | gold_assert(regno == ((insn >> 5) & 0x1f)); |
| 7675 | newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5); |
| 7676 | } |
| 7677 | else |
| 7678 | gold_unreachable(); |
| 7679 | |
| 7680 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| 7681 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 7682 | } // End of tls_ie_to_le |
| 7683 | |
| 7684 | |
| 7685 | template<int size, bool big_endian> |
| 7686 | inline |
| 7687 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 7688 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le( |
| 7689 | const Relocate_info<size, big_endian>* relinfo, |
| 7690 | Target_aarch64<size, big_endian>* target, |
| 7691 | const elfcpp::Rela<size, big_endian>& rela, |
| 7692 | unsigned int r_type, |
| 7693 | unsigned char* view, |
| 7694 | const Symbol_value<size>* psymval) |
| 7695 | { |
| 7696 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
| 7697 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 7698 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 7699 | |
| 7700 | // TLSDESC-GD sequence is like: |
| 7701 | // adrp x0, :tlsdesc:v1 |
| 7702 | // ldr x1, [x0, #:tlsdesc_lo12:v1] |
| 7703 | // add x0, x0, :tlsdesc_lo12:v1 |
| 7704 | // .tlsdesccall v1 |
| 7705 | // blr x1 |
| 7706 | // After desc_gd_to_le optimization, the sequence will be like: |
| 7707 | // movz x0, #0x0, lsl #16 |
| 7708 | // movk x0, #0x10 |
| 7709 | // nop |
| 7710 | // nop |
| 7711 | |
| 7712 | // Calculate tprel value. |
| 7713 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
| 7714 | gold_assert(tls_segment != NULL); |
| 7715 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 7716 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 7717 | AArch64_address value = psymval->value(relinfo->object, addend); |
| 7718 | AArch64_address aligned_tcb_size = |
| 7719 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); |
| 7720 | AArch64_address x = value + aligned_tcb_size; |
| 7721 | // x is the offset to tp, we can only do this if x is within range |
| 7722 | // [0, 2^32-1]. If x is out of range, fail and exit. |
| 7723 | if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0) |
| 7724 | { |
| 7725 | gold_error(_("TLS variable referred by reloc %u is too far from TP. " |
| 7726 | "We Can't do gd_to_le relaxation.\n"), r_type); |
| 7727 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; |
| 7728 | } |
| 7729 | Insntype newinsn; |
| 7730 | switch (r_type) |
| 7731 | { |
| 7732 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 7733 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 7734 | // Change to nop |
| 7735 | newinsn = 0xd503201f; |
| 7736 | break; |
| 7737 | |
| 7738 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 7739 | // Change to movz. |
| 7740 | newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5); |
| 7741 | break; |
| 7742 | |
| 7743 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 7744 | // Change to movk. |
| 7745 | newinsn = 0xf2800000 | ((x & 0xffff) << 5); |
| 7746 | break; |
| 7747 | |
| 7748 | default: |
| 7749 | gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"), |
| 7750 | r_type); |
| 7751 | gold_unreachable(); |
| 7752 | } |
| 7753 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| 7754 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 7755 | } // End of tls_desc_gd_to_le |
| 7756 | |
| 7757 | |
| 7758 | template<int size, bool big_endian> |
| 7759 | inline |
| 7760 | typename AArch64_relocate_functions<size, big_endian>::Status |
| 7761 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie( |
| 7762 | const Relocate_info<size, big_endian>* /* relinfo */, |
| 7763 | Target_aarch64<size, big_endian>* /* target */, |
| 7764 | const elfcpp::Rela<size, big_endian>& rela, |
| 7765 | unsigned int r_type, |
| 7766 | unsigned char* view, |
| 7767 | const Symbol_value<size>* /* psymval */, |
| 7768 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address, |
| 7769 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
| 7770 | { |
| 7771 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
| 7772 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
| 7773 | |
| 7774 | // TLSDESC-GD sequence is like: |
| 7775 | // adrp x0, :tlsdesc:v1 |
| 7776 | // ldr x1, [x0, #:tlsdesc_lo12:v1] |
| 7777 | // add x0, x0, :tlsdesc_lo12:v1 |
| 7778 | // .tlsdesccall v1 |
| 7779 | // blr x1 |
| 7780 | // After desc_gd_to_ie optimization, the sequence will be like: |
| 7781 | // adrp x0, :tlsie:v1 |
| 7782 | // ldr x0, [x0, :tlsie_lo12:v1] |
| 7783 | // nop |
| 7784 | // nop |
| 7785 | |
| 7786 | Insntype* ip = reinterpret_cast<Insntype*>(view); |
| 7787 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
| 7788 | Insntype newinsn; |
| 7789 | switch (r_type) |
| 7790 | { |
| 7791 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: |
| 7792 | case elfcpp::R_AARCH64_TLSDESC_CALL: |
| 7793 | // Change to nop |
| 7794 | newinsn = 0xd503201f; |
| 7795 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); |
| 7796 | break; |
| 7797 | |
| 7798 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
| 7799 | { |
| 7800 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, |
| 7801 | address); |
| 7802 | } |
| 7803 | break; |
| 7804 | |
| 7805 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: |
| 7806 | { |
| 7807 | // Set ldr target register to be x0. |
| 7808 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); |
| 7809 | insn &= 0xffffffe0; |
| 7810 | elfcpp::Swap<32, big_endian>::writeval(ip, insn); |
| 7811 | // Do relocation. |
| 7812 | const AArch64_reloc_property* reloc_property = |
| 7813 | aarch64_reloc_property_table->get_reloc_property( |
| 7814 | elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC); |
| 7815 | return aarch64_reloc_funcs::template rela_general<32>( |
| 7816 | view, got_entry_address, addend, reloc_property); |
| 7817 | } |
| 7818 | break; |
| 7819 | |
| 7820 | default: |
| 7821 | gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"), |
| 7822 | r_type); |
| 7823 | gold_unreachable(); |
| 7824 | } |
| 7825 | return aarch64_reloc_funcs::STATUS_OKAY; |
| 7826 | } // End of tls_desc_gd_to_ie |
| 7827 | |
| 7828 | // Relocate section data. |
| 7829 | |
| 7830 | template<int size, bool big_endian> |
| 7831 | void |
| 7832 | Target_aarch64<size, big_endian>::relocate_section( |
| 7833 | const Relocate_info<size, big_endian>* relinfo, |
| 7834 | unsigned int sh_type, |
| 7835 | const unsigned char* prelocs, |
| 7836 | size_t reloc_count, |
| 7837 | Output_section* output_section, |
| 7838 | bool needs_special_offset_handling, |
| 7839 | unsigned char* view, |
| 7840 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
| 7841 | section_size_type view_size, |
| 7842 | const Reloc_symbol_changes* reloc_symbol_changes) |
| 7843 | { |
| 7844 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 7845 | typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate; |
| 7846 | gold::relocate_section<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, |
| 7847 | AArch64_relocate, gold::Default_comdat_behavior>( |
| 7848 | relinfo, |
| 7849 | this, |
| 7850 | prelocs, |
| 7851 | reloc_count, |
| 7852 | output_section, |
| 7853 | needs_special_offset_handling, |
| 7854 | view, |
| 7855 | address, |
| 7856 | view_size, |
| 7857 | reloc_symbol_changes); |
| 7858 | } |
| 7859 | |
| 7860 | // Return the size of a relocation while scanning during a relocatable |
| 7861 | // link. |
| 7862 | |
| 7863 | template<int size, bool big_endian> |
| 7864 | unsigned int |
| 7865 | Target_aarch64<size, big_endian>::Relocatable_size_for_reloc:: |
| 7866 | get_size_for_reloc( |
| 7867 | unsigned int , |
| 7868 | Relobj* ) |
| 7869 | { |
| 7870 | // We will never support SHT_REL relocations. |
| 7871 | gold_unreachable(); |
| 7872 | return 0; |
| 7873 | } |
| 7874 | |
| 7875 | // Scan the relocs during a relocatable link. |
| 7876 | |
| 7877 | template<int size, bool big_endian> |
| 7878 | void |
| 7879 | Target_aarch64<size, big_endian>::scan_relocatable_relocs( |
| 7880 | Symbol_table* symtab, |
| 7881 | Layout* layout, |
| 7882 | Sized_relobj_file<size, big_endian>* object, |
| 7883 | unsigned int data_shndx, |
| 7884 | unsigned int sh_type, |
| 7885 | const unsigned char* prelocs, |
| 7886 | size_t reloc_count, |
| 7887 | Output_section* output_section, |
| 7888 | bool needs_special_offset_handling, |
| 7889 | size_t local_symbol_count, |
| 7890 | const unsigned char* plocal_symbols, |
| 7891 | Relocatable_relocs* rr) |
| 7892 | { |
| 7893 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 7894 | |
| 7895 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, |
| 7896 | Relocatable_size_for_reloc> Scan_relocatable_relocs; |
| 7897 | |
| 7898 | gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, |
| 7899 | Scan_relocatable_relocs>( |
| 7900 | symtab, |
| 7901 | layout, |
| 7902 | object, |
| 7903 | data_shndx, |
| 7904 | prelocs, |
| 7905 | reloc_count, |
| 7906 | output_section, |
| 7907 | needs_special_offset_handling, |
| 7908 | local_symbol_count, |
| 7909 | plocal_symbols, |
| 7910 | rr); |
| 7911 | } |
| 7912 | |
| 7913 | // Relocate a section during a relocatable link. |
| 7914 | |
| 7915 | template<int size, bool big_endian> |
| 7916 | void |
| 7917 | Target_aarch64<size, big_endian>::relocate_relocs( |
| 7918 | const Relocate_info<size, big_endian>* relinfo, |
| 7919 | unsigned int sh_type, |
| 7920 | const unsigned char* prelocs, |
| 7921 | size_t reloc_count, |
| 7922 | Output_section* output_section, |
| 7923 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
| 7924 | const Relocatable_relocs* rr, |
| 7925 | unsigned char* view, |
| 7926 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
| 7927 | section_size_type view_size, |
| 7928 | unsigned char* reloc_view, |
| 7929 | section_size_type reloc_view_size) |
| 7930 | { |
| 7931 | gold_assert(sh_type == elfcpp::SHT_RELA); |
| 7932 | |
| 7933 | gold::relocate_relocs<size, big_endian, elfcpp::SHT_RELA>( |
| 7934 | relinfo, |
| 7935 | prelocs, |
| 7936 | reloc_count, |
| 7937 | output_section, |
| 7938 | offset_in_output_section, |
| 7939 | rr, |
| 7940 | view, |
| 7941 | view_address, |
| 7942 | view_size, |
| 7943 | reloc_view, |
| 7944 | reloc_view_size); |
| 7945 | } |
| 7946 | |
| 7947 | |
| 7948 | // Return whether this is a 3-insn erratum sequence. |
| 7949 | |
| 7950 | template<int size, bool big_endian> |
| 7951 | bool |
| 7952 | Target_aarch64<size, big_endian>::is_erratum_843419_sequence( |
| 7953 | typename elfcpp::Swap<32,big_endian>::Valtype insn1, |
| 7954 | typename elfcpp::Swap<32,big_endian>::Valtype insn2, |
| 7955 | typename elfcpp::Swap<32,big_endian>::Valtype insn3) |
| 7956 | { |
| 7957 | unsigned rt1, rt2; |
| 7958 | bool load, pair; |
| 7959 | |
| 7960 | // The 2nd insn is a single register load or store; or register pair |
| 7961 | // store. |
| 7962 | if (Insn_utilities::aarch64_mem_op_p(insn2, &rt1, &rt2, &pair, &load) |
| 7963 | && (!pair || (pair && !load))) |
| 7964 | { |
| 7965 | // The 3rd insn is a load or store instruction from the "Load/store |
| 7966 | // register (unsigned immediate)" encoding class, using Rn as the |
| 7967 | // base address register. |
| 7968 | if (Insn_utilities::aarch64_ldst_uimm(insn3) |
| 7969 | && (Insn_utilities::aarch64_rn(insn3) |
| 7970 | == Insn_utilities::aarch64_rd(insn1))) |
| 7971 | return true; |
| 7972 | } |
| 7973 | return false; |
| 7974 | } |
| 7975 | |
| 7976 | |
| 7977 | // Return whether this is a 835769 sequence. |
| 7978 | // (Similarly implemented as in elfnn-aarch64.c.) |
| 7979 | |
| 7980 | template<int size, bool big_endian> |
| 7981 | bool |
| 7982 | Target_aarch64<size, big_endian>::is_erratum_835769_sequence( |
| 7983 | typename elfcpp::Swap<32,big_endian>::Valtype insn1, |
| 7984 | typename elfcpp::Swap<32,big_endian>::Valtype insn2) |
| 7985 | { |
| 7986 | uint32_t rt; |
| 7987 | uint32_t rt2; |
| 7988 | uint32_t rn; |
| 7989 | uint32_t rm; |
| 7990 | uint32_t ra; |
| 7991 | bool pair; |
| 7992 | bool load; |
| 7993 | |
| 7994 | if (Insn_utilities::aarch64_mlxl(insn2) |
| 7995 | && Insn_utilities::aarch64_mem_op_p (insn1, &rt, &rt2, &pair, &load)) |
| 7996 | { |
| 7997 | /* Any SIMD memory op is independent of the subsequent MLA |
| 7998 | by definition of the erratum. */ |
| 7999 | if (Insn_utilities::aarch64_bit(insn1, 26)) |
| 8000 | return true; |
| 8001 | |
| 8002 | /* If not SIMD, check for integer memory ops and MLA relationship. */ |
| 8003 | rn = Insn_utilities::aarch64_rn(insn2); |
| 8004 | ra = Insn_utilities::aarch64_ra(insn2); |
| 8005 | rm = Insn_utilities::aarch64_rm(insn2); |
| 8006 | |
| 8007 | /* If this is a load and there's a true(RAW) dependency, we are safe |
| 8008 | and this is not an erratum sequence. */ |
| 8009 | if (load && |
| 8010 | (rt == rn || rt == rm || rt == ra |
| 8011 | || (pair && (rt2 == rn || rt2 == rm || rt2 == ra)))) |
| 8012 | return false; |
| 8013 | |
| 8014 | /* We conservatively put out stubs for all other cases (including |
| 8015 | writebacks). */ |
| 8016 | return true; |
| 8017 | } |
| 8018 | |
| 8019 | return false; |
| 8020 | } |
| 8021 | |
| 8022 | |
| 8023 | // Helper method to create erratum stub for ST_E_843419 and ST_E_835769. |
| 8024 | |
| 8025 | template<int size, bool big_endian> |
| 8026 | void |
| 8027 | Target_aarch64<size, big_endian>::create_erratum_stub( |
| 8028 | AArch64_relobj<size, big_endian>* relobj, |
| 8029 | unsigned int shndx, |
| 8030 | section_size_type erratum_insn_offset, |
| 8031 | Address erratum_address, |
| 8032 | typename Insn_utilities::Insntype erratum_insn, |
| 8033 | int erratum_type, |
| 8034 | unsigned int e843419_adrp_offset) |
| 8035 | { |
| 8036 | gold_assert(erratum_type == ST_E_843419 || erratum_type == ST_E_835769); |
| 8037 | The_stub_table* stub_table = relobj->stub_table(shndx); |
| 8038 | gold_assert(stub_table != NULL); |
| 8039 | if (stub_table->find_erratum_stub(relobj, |
| 8040 | shndx, |
| 8041 | erratum_insn_offset) == NULL) |
| 8042 | { |
| 8043 | const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; |
| 8044 | The_erratum_stub* stub; |
| 8045 | if (erratum_type == ST_E_835769) |
| 8046 | stub = new The_erratum_stub(relobj, erratum_type, shndx, |
| 8047 | erratum_insn_offset); |
| 8048 | else if (erratum_type == ST_E_843419) |
| 8049 | stub = new E843419_stub<size, big_endian>( |
| 8050 | relobj, shndx, erratum_insn_offset, e843419_adrp_offset); |
| 8051 | else |
| 8052 | gold_unreachable(); |
| 8053 | stub->set_erratum_insn(erratum_insn); |
| 8054 | stub->set_erratum_address(erratum_address); |
| 8055 | // For erratum ST_E_843419 and ST_E_835769, the destination address is |
| 8056 | // always the next insn after erratum insn. |
| 8057 | stub->set_destination_address(erratum_address + BPI); |
| 8058 | stub_table->add_erratum_stub(stub); |
| 8059 | } |
| 8060 | } |
| 8061 | |
| 8062 | |
| 8063 | // Scan erratum for section SHNDX range [output_address + span_start, |
| 8064 | // output_address + span_end). Note here we do not share the code with |
| 8065 | // scan_erratum_843419_span function, because for 843419 we optimize by only |
| 8066 | // scanning the last few insns of a page, whereas for 835769, we need to scan |
| 8067 | // every insn. |
| 8068 | |
| 8069 | template<int size, bool big_endian> |
| 8070 | void |
| 8071 | Target_aarch64<size, big_endian>::scan_erratum_835769_span( |
| 8072 | AArch64_relobj<size, big_endian>* relobj, |
| 8073 | unsigned int shndx, |
| 8074 | const section_size_type span_start, |
| 8075 | const section_size_type span_end, |
| 8076 | unsigned char* input_view, |
| 8077 | Address output_address) |
| 8078 | { |
| 8079 | typedef typename Insn_utilities::Insntype Insntype; |
| 8080 | |
| 8081 | const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN; |
| 8082 | |
| 8083 | // Adjust output_address and view to the start of span. |
| 8084 | output_address += span_start; |
| 8085 | input_view += span_start; |
| 8086 | |
| 8087 | section_size_type span_length = span_end - span_start; |
| 8088 | section_size_type offset = 0; |
| 8089 | for (offset = 0; offset + BPI < span_length; offset += BPI) |
| 8090 | { |
| 8091 | Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset); |
| 8092 | Insntype insn1 = ip[0]; |
| 8093 | Insntype insn2 = ip[1]; |
| 8094 | if (is_erratum_835769_sequence(insn1, insn2)) |
| 8095 | { |
| 8096 | Insntype erratum_insn = insn2; |
| 8097 | // "span_start + offset" is the offset for insn1. So for insn2, it is |
| 8098 | // "span_start + offset + BPI". |
| 8099 | section_size_type erratum_insn_offset = span_start + offset + BPI; |
| 8100 | Address erratum_address = output_address + offset + BPI; |
| 8101 | gold_info(_("Erratum 835769 found and fixed at \"%s\", " |
| 8102 | "section %d, offset 0x%08x."), |
| 8103 | relobj->name().c_str(), shndx, |
| 8104 | (unsigned int)(span_start + offset)); |
| 8105 | |
| 8106 | this->create_erratum_stub(relobj, shndx, |
| 8107 | erratum_insn_offset, erratum_address, |
| 8108 | erratum_insn, ST_E_835769); |
| 8109 | offset += BPI; // Skip mac insn. |
| 8110 | } |
| 8111 | } |
| 8112 | } // End of "Target_aarch64::scan_erratum_835769_span". |
| 8113 | |
| 8114 | |
| 8115 | // Scan erratum for section SHNDX range |
| 8116 | // [output_address + span_start, output_address + span_end). |
| 8117 | |
| 8118 | template<int size, bool big_endian> |
| 8119 | void |
| 8120 | Target_aarch64<size, big_endian>::scan_erratum_843419_span( |
| 8121 | AArch64_relobj<size, big_endian>* relobj, |
| 8122 | unsigned int shndx, |
| 8123 | const section_size_type span_start, |
| 8124 | const section_size_type span_end, |
| 8125 | unsigned char* input_view, |
| 8126 | Address output_address) |
| 8127 | { |
| 8128 | typedef typename Insn_utilities::Insntype Insntype; |
| 8129 | |
| 8130 | // Adjust output_address and view to the start of span. |
| 8131 | output_address += span_start; |
| 8132 | input_view += span_start; |
| 8133 | |
| 8134 | if ((output_address & 0x03) != 0) |
| 8135 | return; |
| 8136 | |
| 8137 | section_size_type offset = 0; |
| 8138 | section_size_type span_length = span_end - span_start; |
| 8139 | // The first instruction must be ending at 0xFF8 or 0xFFC. |
| 8140 | unsigned int page_offset = output_address & 0xFFF; |
| 8141 | // Make sure starting position, that is "output_address+offset", |
| 8142 | // starts at page position 0xff8 or 0xffc. |
| 8143 | if (page_offset < 0xff8) |
| 8144 | offset = 0xff8 - page_offset; |
| 8145 | while (offset + 3 * Insn_utilities::BYTES_PER_INSN <= span_length) |
| 8146 | { |
| 8147 | Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset); |
| 8148 | Insntype insn1 = ip[0]; |
| 8149 | if (Insn_utilities::is_adrp(insn1)) |
| 8150 | { |
| 8151 | Insntype insn2 = ip[1]; |
| 8152 | Insntype insn3 = ip[2]; |
| 8153 | Insntype erratum_insn; |
| 8154 | unsigned insn_offset; |
| 8155 | bool do_report = false; |
| 8156 | if (is_erratum_843419_sequence(insn1, insn2, insn3)) |
| 8157 | { |
| 8158 | do_report = true; |
| 8159 | erratum_insn = insn3; |
| 8160 | insn_offset = 2 * Insn_utilities::BYTES_PER_INSN; |
| 8161 | } |
| 8162 | else if (offset + 4 * Insn_utilities::BYTES_PER_INSN <= span_length) |
| 8163 | { |
| 8164 | // Optionally we can have an insn between ins2 and ins3 |
| 8165 | Insntype insn_opt = ip[2]; |
| 8166 | // And insn_opt must not be a branch. |
| 8167 | if (!Insn_utilities::aarch64_b(insn_opt) |
| 8168 | && !Insn_utilities::aarch64_bl(insn_opt) |
| 8169 | && !Insn_utilities::aarch64_blr(insn_opt) |
| 8170 | && !Insn_utilities::aarch64_br(insn_opt)) |
| 8171 | { |
| 8172 | // And insn_opt must not write to dest reg in insn1. However |
| 8173 | // we do a conservative scan, which means we may fix/report |
| 8174 | // more than necessary, but it doesn't hurt. |
| 8175 | |
| 8176 | Insntype insn4 = ip[3]; |
| 8177 | if (is_erratum_843419_sequence(insn1, insn2, insn4)) |
| 8178 | { |
| 8179 | do_report = true; |
| 8180 | erratum_insn = insn4; |
| 8181 | insn_offset = 3 * Insn_utilities::BYTES_PER_INSN; |
| 8182 | } |
| 8183 | } |
| 8184 | } |
| 8185 | if (do_report) |
| 8186 | { |
| 8187 | gold_info(_("Erratum 843419 found and fixed at \"%s\", " |
| 8188 | "section %d, offset 0x%08x."), |
| 8189 | relobj->name().c_str(), shndx, |
| 8190 | (unsigned int)(span_start + offset)); |
| 8191 | unsigned int erratum_insn_offset = |
| 8192 | span_start + offset + insn_offset; |
| 8193 | Address erratum_address = |
| 8194 | output_address + offset + insn_offset; |
| 8195 | create_erratum_stub(relobj, shndx, |
| 8196 | erratum_insn_offset, erratum_address, |
| 8197 | erratum_insn, ST_E_843419, |
| 8198 | span_start + offset); |
| 8199 | } |
| 8200 | } |
| 8201 | |
| 8202 | // Advance to next candidate instruction. We only consider instruction |
| 8203 | // sequences starting at a page offset of 0xff8 or 0xffc. |
| 8204 | page_offset = (output_address + offset) & 0xfff; |
| 8205 | if (page_offset == 0xff8) |
| 8206 | offset += 4; |
| 8207 | else // (page_offset == 0xffc), we move to next page's 0xff8. |
| 8208 | offset += 0xffc; |
| 8209 | } |
| 8210 | } // End of "Target_aarch64::scan_erratum_843419_span". |
| 8211 | |
| 8212 | |
| 8213 | // The selector for aarch64 object files. |
| 8214 | |
| 8215 | template<int size, bool big_endian> |
| 8216 | class Target_selector_aarch64 : public Target_selector |
| 8217 | { |
| 8218 | public: |
| 8219 | Target_selector_aarch64(); |
| 8220 | |
| 8221 | virtual Target* |
| 8222 | do_instantiate_target() |
| 8223 | { return new Target_aarch64<size, big_endian>(); } |
| 8224 | }; |
| 8225 | |
| 8226 | template<> |
| 8227 | Target_selector_aarch64<32, true>::Target_selector_aarch64() |
| 8228 | : Target_selector(elfcpp::EM_AARCH64, 32, true, |
| 8229 | "elf32-bigaarch64", "aarch64_elf32_be_vec") |
| 8230 | { } |
| 8231 | |
| 8232 | template<> |
| 8233 | Target_selector_aarch64<32, false>::Target_selector_aarch64() |
| 8234 | : Target_selector(elfcpp::EM_AARCH64, 32, false, |
| 8235 | "elf32-littleaarch64", "aarch64_elf32_le_vec") |
| 8236 | { } |
| 8237 | |
| 8238 | template<> |
| 8239 | Target_selector_aarch64<64, true>::Target_selector_aarch64() |
| 8240 | : Target_selector(elfcpp::EM_AARCH64, 64, true, |
| 8241 | "elf64-bigaarch64", "aarch64_elf64_be_vec") |
| 8242 | { } |
| 8243 | |
| 8244 | template<> |
| 8245 | Target_selector_aarch64<64, false>::Target_selector_aarch64() |
| 8246 | : Target_selector(elfcpp::EM_AARCH64, 64, false, |
| 8247 | "elf64-littleaarch64", "aarch64_elf64_le_vec") |
| 8248 | { } |
| 8249 | |
| 8250 | Target_selector_aarch64<32, true> target_selector_aarch64elf32b; |
| 8251 | Target_selector_aarch64<32, false> target_selector_aarch64elf32; |
| 8252 | Target_selector_aarch64<64, true> target_selector_aarch64elfb; |
| 8253 | Target_selector_aarch64<64, false> target_selector_aarch64elf; |
| 8254 | |
| 8255 | } // End anonymous namespace. |