gold/aarch64.cc

   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, &section_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     unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
3342     this->copy_relocs_.copy_reloc(symtab, layout,
3343                                   symtab->get_sized_symbol<size>(sym),
3344                                   object, shndx, output_section,
3345                                   r_type, reloc.get_r_offset(),
3346                                   reloc.get_r_addend(),
3347                                   this->rela_dyn_section(layout));
3348   }
3349
3350   // Information about this specific target which we pass to the
3351   // general Target structure.
3352   static const Target::Target_info aarch64_info;
3353
3354   // The types of GOT entries needed for this platform.
3355   // These values are exposed to the ABI in an incremental link.
3356   // Do not renumber existing values without changing the version
3357   // number of the .gnu_incremental_inputs section.
3358   enum Got_type
3359   {
3360     GOT_TYPE_STANDARD = 0,      // GOT entry for a regular symbol
3361     GOT_TYPE_TLS_OFFSET = 1,    // GOT entry for TLS offset
3362     GOT_TYPE_TLS_PAIR = 2,      // GOT entry for TLS module/offset pair
3363     GOT_TYPE_TLS_DESC = 3       // GOT entry for TLS_DESC pair
3364   };
3365
3366   // This type is used as the argument to the target specific
3367   // relocation routines.  The only target specific reloc is
3368   // R_AARCh64_TLSDESC against a local symbol.
3369   struct Tlsdesc_info
3370   {
3371     Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object,
3372                  unsigned int a_r_sym)
3373       : object(a_object), r_sym(a_r_sym)
3374     { }
3375
3376     // The object in which the local symbol is defined.
3377     Sized_relobj_file<size, big_endian>* object;
3378     // The local symbol index in the object.
3379     unsigned int r_sym;
3380   };
3381
3382   // The GOT section.
3383   Output_data_got_aarch64<size, big_endian>* got_;
3384   // The PLT section.
3385   Output_data_plt_aarch64<size, big_endian>* plt_;
3386   // The GOT PLT section.
3387   Output_data_space* got_plt_;
3388   // The GOT section for IRELATIVE relocations.
3389   Output_data_space* got_irelative_;
3390   // The GOT section for TLSDESC relocations.
3391   Output_data_got<size, big_endian>* got_tlsdesc_;
3392   // The _GLOBAL_OFFSET_TABLE_ symbol.
3393   Symbol* global_offset_table_;
3394   // The dynamic reloc section.
3395   Reloc_section* rela_dyn_;
3396   // The section to use for IRELATIVE relocs.
3397   Reloc_section* rela_irelative_;
3398   // Relocs saved to avoid a COPY reloc.
3399   Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
3400   // Offset of the GOT entry for the TLS module index.
3401   unsigned int got_mod_index_offset_;
3402   // We handle R_AARCH64_TLSDESC against a local symbol as a target
3403   // specific relocation. Here we store the object and local symbol
3404   // index for the relocation.
3405   std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
3406   // True if the _TLS_MODULE_BASE_ symbol has been defined.
3407   bool tls_base_symbol_defined_;
3408   // List of stub_tables
3409   Stub_table_list stub_tables_;
3410   // Actual stub group size
3411   section_size_type stub_group_size_;
3412   AArch64_input_section_map aarch64_input_section_map_;
3413 };  // End of Target_aarch64
3414
3415
3416 template<>
3417 const Target::Target_info Target_aarch64<64, false>::aarch64_info =
3418 {
3419   64,                   // size
3420   false,                // is_big_endian
3421   elfcpp::EM_AARCH64,   // machine_code
3422   false,                // has_make_symbol
3423   false,                // has_resolve
3424   false,                // has_code_fill
3425   true,                 // is_default_stack_executable
3426   true,                 // can_icf_inline_merge_sections
3427   '\0',                 // wrap_char
3428   "/lib/ld.so.1",       // program interpreter
3429   0x400000,             // default_text_segment_address
3430   0x10000,              // abi_pagesize (overridable by -z max-page-size)
3431   0x1000,               // common_pagesize (overridable by -z common-page-size)
3432   false,                // isolate_execinstr
3433   0,                    // rosegment_gap
3434   elfcpp::SHN_UNDEF,    // small_common_shndx
3435   elfcpp::SHN_UNDEF,    // large_common_shndx
3436   0,                    // small_common_section_flags
3437   0,                    // large_common_section_flags
3438   NULL,                 // attributes_section
3439   NULL,                 // attributes_vendor
3440   "_start",             // entry_symbol_name
3441   32,                   // hash_entry_size
3442 };
3443
3444 template<>
3445 const Target::Target_info Target_aarch64<32, false>::aarch64_info =
3446 {
3447   32,                   // size
3448   false,                // is_big_endian
3449   elfcpp::EM_AARCH64,   // machine_code
3450   false,                // has_make_symbol
3451   false,                // has_resolve
3452   false,                // has_code_fill
3453   true,                 // is_default_stack_executable
3454   false,                // can_icf_inline_merge_sections
3455   '\0',                 // wrap_char
3456   "/lib/ld.so.1",       // program interpreter
3457   0x400000,             // default_text_segment_address
3458   0x10000,              // abi_pagesize (overridable by -z max-page-size)
3459   0x1000,               // common_pagesize (overridable by -z common-page-size)
3460   false,                // isolate_execinstr
3461   0,                    // rosegment_gap
3462   elfcpp::SHN_UNDEF,    // small_common_shndx
3463   elfcpp::SHN_UNDEF,    // large_common_shndx
3464   0,                    // small_common_section_flags
3465   0,                    // large_common_section_flags
3466   NULL,                 // attributes_section
3467   NULL,                 // attributes_vendor
3468   "_start",             // entry_symbol_name
3469   32,                   // hash_entry_size
3470 };
3471
3472 template<>
3473 const Target::Target_info Target_aarch64<64, true>::aarch64_info =
3474 {
3475   64,                   // size
3476   true,                 // is_big_endian
3477   elfcpp::EM_AARCH64,   // machine_code
3478   false,                // has_make_symbol
3479   false,                // has_resolve
3480   false,                // has_code_fill
3481   true,                 // is_default_stack_executable
3482   true,                 // can_icf_inline_merge_sections
3483   '\0',                 // wrap_char
3484   "/lib/ld.so.1",       // program interpreter
3485   0x400000,             // default_text_segment_address
3486   0x10000,              // abi_pagesize (overridable by -z max-page-size)
3487   0x1000,               // common_pagesize (overridable by -z common-page-size)
3488   false,                // isolate_execinstr
3489   0,                    // rosegment_gap
3490   elfcpp::SHN_UNDEF,    // small_common_shndx
3491   elfcpp::SHN_UNDEF,    // large_common_shndx
3492   0,                    // small_common_section_flags
3493   0,                    // large_common_section_flags
3494   NULL,                 // attributes_section
3495   NULL,                 // attributes_vendor
3496   "_start",             // entry_symbol_name
3497   32,                   // hash_entry_size
3498 };
3499
3500 template<>
3501 const Target::Target_info Target_aarch64<32, true>::aarch64_info =
3502 {
3503   32,                   // size
3504   true,                 // is_big_endian
3505   elfcpp::EM_AARCH64,   // machine_code
3506   false,                // has_make_symbol
3507   false,                // has_resolve
3508   false,                // has_code_fill
3509   true,                 // is_default_stack_executable
3510   false,                // can_icf_inline_merge_sections
3511   '\0',                 // wrap_char
3512   "/lib/ld.so.1",       // program interpreter
3513   0x400000,             // default_text_segment_address
3514   0x10000,              // abi_pagesize (overridable by -z max-page-size)
3515   0x1000,               // common_pagesize (overridable by -z common-page-size)
3516   false,                // isolate_execinstr
3517   0,                    // rosegment_gap
3518   elfcpp::SHN_UNDEF,    // small_common_shndx
3519   elfcpp::SHN_UNDEF,    // large_common_shndx
3520   0,                    // small_common_section_flags
3521   0,                    // large_common_section_flags
3522   NULL,                 // attributes_section
3523   NULL,                 // attributes_vendor
3524   "_start",             // entry_symbol_name
3525   32,                   // hash_entry_size
3526 };
3527
3528 // Get the GOT section, creating it if necessary.
3529
3530 template<int size, bool big_endian>
3531 Output_data_got_aarch64<size, big_endian>*
3532 Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab,
3533                                               Layout* layout)
3534 {
3535   if (this->got_ == NULL)
3536     {
3537       gold_assert(symtab != NULL && layout != NULL);
3538
3539       // When using -z now, we can treat .got.plt as a relro section.
3540       // Without -z now, it is modified after program startup by lazy
3541       // PLT relocations.
3542       bool is_got_plt_relro = parameters->options().now();
3543       Output_section_order got_order = (is_got_plt_relro
3544                                         ? ORDER_RELRO
3545                                         : ORDER_RELRO_LAST);
3546       Output_section_order got_plt_order = (is_got_plt_relro
3547                                             ? ORDER_RELRO
3548                                             : ORDER_NON_RELRO_FIRST);
3549
3550       // Layout of .got and .got.plt sections.
3551       // .got[0] &_DYNAMIC                          <-_GLOBAL_OFFSET_TABLE_
3552       // ...
3553       // .gotplt[0] reserved for ld.so (&linkmap)   <--DT_PLTGOT
3554       // .gotplt[1] reserved for ld.so (resolver)
3555       // .gotplt[2] reserved
3556
3557       // Generate .got section.
3558       this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab,
3559                                                                  layout);
3560       layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
3561                                       (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
3562                                       this->got_, got_order, true);
3563       // The first word of GOT is reserved for the address of .dynamic.
3564       // We put 0 here now. The value will be replaced later in
3565       // Output_data_got_aarch64::do_write.
3566       this->got_->add_constant(0);
3567
3568       // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3569       // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3570       // even if there is a .got.plt section.
3571       this->global_offset_table_ =
3572         symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
3573                                       Symbol_table::PREDEFINED,
3574                                       this->got_,
3575                                       0, 0, elfcpp::STT_OBJECT,
3576                                       elfcpp::STB_LOCAL,
3577                                       elfcpp::STV_HIDDEN, 0,
3578                                       false, false);
3579
3580       // Generate .got.plt section.
3581       this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT");
3582       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3583                                       (elfcpp::SHF_ALLOC
3584                                        | elfcpp::SHF_WRITE),
3585                                       this->got_plt_, got_plt_order,
3586                                       is_got_plt_relro);
3587
3588       // The first three entries are reserved.
3589       this->got_plt_->set_current_data_size(
3590         AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
3591
3592       // If there are any IRELATIVE relocations, they get GOT entries
3593       // in .got.plt after the jump slot entries.
3594       this->got_irelative_ = new Output_data_space(size / 8,
3595                                                    "** GOT IRELATIVE PLT");
3596       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3597                                       (elfcpp::SHF_ALLOC
3598                                        | elfcpp::SHF_WRITE),
3599                                       this->got_irelative_,
3600                                       got_plt_order,
3601                                       is_got_plt_relro);
3602
3603       // If there are any TLSDESC relocations, they get GOT entries in
3604       // .got.plt after the jump slot and IRELATIVE entries.
3605       this->got_tlsdesc_ = new Output_data_got<size, big_endian>();
3606       layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3607                                       (elfcpp::SHF_ALLOC
3608                                        | elfcpp::SHF_WRITE),
3609                                       this->got_tlsdesc_,
3610                                       got_plt_order,
3611                                       is_got_plt_relro);
3612
3613       if (!is_got_plt_relro)
3614         {
3615           // Those bytes can go into the relro segment.
3616           layout->increase_relro(
3617             AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
3618         }
3619
3620     }
3621   return this->got_;
3622 }
3623
3624 // Get the dynamic reloc section, creating it if necessary.
3625
3626 template<int size, bool big_endian>
3627 typename Target_aarch64<size, big_endian>::Reloc_section*
3628 Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout)
3629 {
3630   if (this->rela_dyn_ == NULL)
3631     {
3632       gold_assert(layout != NULL);
3633       this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
3634       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
3635                                       elfcpp::SHF_ALLOC, this->rela_dyn_,
3636                                       ORDER_DYNAMIC_RELOCS, false);
3637     }
3638   return this->rela_dyn_;
3639 }
3640
3641 // Get the section to use for IRELATIVE relocs, creating it if
3642 // necessary.  These go in .rela.dyn, but only after all other dynamic
3643 // relocations.  They need to follow the other dynamic relocations so
3644 // that they can refer to global variables initialized by those
3645 // relocs.
3646
3647 template<int size, bool big_endian>
3648 typename Target_aarch64<size, big_endian>::Reloc_section*
3649 Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout)
3650 {
3651   if (this->rela_irelative_ == NULL)
3652     {
3653       // Make sure we have already created the dynamic reloc section.
3654       this->rela_dyn_section(layout);
3655       this->rela_irelative_ = new Reloc_section(false);
3656       layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
3657                                       elfcpp::SHF_ALLOC, this->rela_irelative_,
3658                                       ORDER_DYNAMIC_RELOCS, false);
3659       gold_assert(this->rela_dyn_->output_section()
3660                   == this->rela_irelative_->output_section());
3661     }
3662   return this->rela_irelative_;
3663 }
3664
3665
3666 // do_make_elf_object to override the same function in the base class.  We need
3667 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3668 // store backend specific information. Hence we need to have our own ELF object
3669 // creation.
3670
3671 template<int size, bool big_endian>
3672 Object*
3673 Target_aarch64<size, big_endian>::do_make_elf_object(
3674     const std::string& name,
3675     Input_file* input_file,
3676     off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
3677 {
3678   int et = ehdr.get_e_type();
3679   // ET_EXEC files are valid input for --just-symbols/-R,
3680   // and we treat them as relocatable objects.
3681   if (et == elfcpp::ET_EXEC && input_file->just_symbols())
3682     return Sized_target<size, big_endian>::do_make_elf_object(
3683         name, input_file, offset, ehdr);
3684   else if (et == elfcpp::ET_REL)
3685     {
3686       AArch64_relobj<size, big_endian>* obj =
3687         new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr);
3688       obj->setup();
3689       return obj;
3690     }
3691   else if (et == elfcpp::ET_DYN)
3692     {
3693       // Keep base implementation.
3694       Sized_dynobj<size, big_endian>* obj =
3695           new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
3696       obj->setup();
3697       return obj;
3698     }
3699   else
3700     {
3701       gold_error(_("%s: unsupported ELF file type %d"),
3702                  name.c_str(), et);
3703       return NULL;
3704     }
3705 }
3706
3707
3708 // Scan a relocation for stub generation.
3709
3710 template<int size, bool big_endian>
3711 void
3712 Target_aarch64<size, big_endian>::scan_reloc_for_stub(
3713     const Relocate_info<size, big_endian>* relinfo,
3714     unsigned int r_type,
3715     const Sized_symbol<size>* gsym,
3716     unsigned int r_sym,
3717     const Symbol_value<size>* psymval,
3718     typename elfcpp::Elf_types<size>::Elf_Swxword addend,
3719     Address address)
3720 {
3721   const AArch64_relobj<size, big_endian>* aarch64_relobj =
3722       static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
3723
3724   Symbol_value<size> symval;
3725   if (gsym != NULL)
3726     {
3727       const AArch64_reloc_property* arp = aarch64_reloc_property_table->
3728         get_reloc_property(r_type);
3729       if (gsym->use_plt_offset(arp->reference_flags()))
3730         {
3731           // This uses a PLT, change the symbol value.
3732           symval.set_output_value(this->plt_section()->address()
3733                                   + gsym->plt_offset());
3734           psymval = &symval;
3735         }
3736       else if (gsym->is_undefined())
3737         // There is no need to generate a stub symbol is undefined.
3738         return;
3739     }
3740
3741   // Get the symbol value.
3742   typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0);
3743
3744   // Owing to pipelining, the PC relative branches below actually skip
3745   // two instructions when the branch offset is 0.
3746   Address destination = static_cast<Address>(-1);
3747   switch (r_type)
3748     {
3749     case elfcpp::R_AARCH64_CALL26:
3750     case elfcpp::R_AARCH64_JUMP26:
3751       destination = value + addend;
3752       break;
3753     default:
3754       gold_unreachable();
3755     }
3756
3757   int stub_type = The_reloc_stub::
3758       stub_type_for_reloc(r_type, address, destination);
3759   if (stub_type == ST_NONE)
3760     return;
3761
3762   The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
3763   gold_assert(stub_table != NULL);
3764
3765   The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend);
3766   The_reloc_stub* stub = stub_table->find_reloc_stub(key);
3767   if (stub == NULL)
3768     {
3769       stub = new The_reloc_stub(stub_type);
3770       stub_table->add_reloc_stub(stub, key);
3771     }
3772   stub->set_destination_address(destination);
3773 }  // End of Target_aarch64::scan_reloc_for_stub
3774
3775
3776 // This function scans a relocation section for stub generation.
3777 // The template parameter Relocate must be a class type which provides
3778 // a single function, relocate(), which implements the machine
3779 // specific part of a relocation.
3780
3781 // BIG_ENDIAN is the endianness of the data.  SH_TYPE is the section type:
3782 // SHT_REL or SHT_RELA.
3783
3784 // PRELOCS points to the relocation data.  RELOC_COUNT is the number
3785 // of relocs.  OUTPUT_SECTION is the output section.
3786 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3787 // mapped to output offsets.
3788
3789 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3790 // VIEW_SIZE is the size.  These refer to the input section, unless
3791 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3792 // the output section.
3793
3794 template<int size, bool big_endian>
3795 template<int sh_type>
3796 void inline
3797 Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs(
3798     const Relocate_info<size, big_endian>* relinfo,
3799     const unsigned char* prelocs,
3800     size_t reloc_count,
3801     Output_section* /*output_section*/,
3802     bool /*needs_special_offset_handling*/,
3803     const unsigned char* /*view*/,
3804     Address view_address,
3805     section_size_type)
3806 {
3807   typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype;
3808
3809   const int reloc_size =
3810       Reloc_types<sh_type,size,big_endian>::reloc_size;
3811   AArch64_relobj<size, big_endian>* object =
3812       static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
3813   unsigned int local_count = object->local_symbol_count();
3814
3815   gold::Default_comdat_behavior default_comdat_behavior;
3816   Comdat_behavior comdat_behavior = CB_UNDETERMINED;
3817
3818   for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
3819     {
3820       Reltype reloc(prelocs);
3821       typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
3822       unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
3823       unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
3824       if (r_type != elfcpp::R_AARCH64_CALL26
3825           && r_type != elfcpp::R_AARCH64_JUMP26)
3826         continue;
3827
3828       section_offset_type offset =
3829           convert_to_section_size_type(reloc.get_r_offset());
3830
3831       // Get the addend.
3832       typename elfcpp::Elf_types<size>::Elf_Swxword addend =
3833           reloc.get_r_addend();
3834
3835       const Sized_symbol<size>* sym;
3836       Symbol_value<size> symval;
3837       const Symbol_value<size> *psymval;
3838       bool is_defined_in_discarded_section;
3839       unsigned int shndx;
3840       if (r_sym < local_count)
3841         {
3842           sym = NULL;
3843           psymval = object->local_symbol(r_sym);
3844
3845           // If the local symbol belongs to a section we are discarding,
3846           // and that section is a debug section, try to find the
3847           // corresponding kept section and map this symbol to its
3848           // counterpart in the kept section.  The symbol must not
3849           // correspond to a section we are folding.
3850           bool is_ordinary;
3851           shndx = psymval->input_shndx(&is_ordinary);
3852           is_defined_in_discarded_section =
3853             (is_ordinary
3854              && shndx != elfcpp::SHN_UNDEF
3855              && !object->is_section_included(shndx)
3856              && !relinfo->symtab->is_section_folded(object, shndx));
3857
3858           // We need to compute the would-be final value of this local
3859           // symbol.
3860           if (!is_defined_in_discarded_section)
3861             {
3862               typedef Sized_relobj_file<size, big_endian> ObjType;
3863               typename ObjType::Compute_final_local_value_status status =
3864                 object->compute_final_local_value(r_sym, psymval, &symval,
3865                                                   relinfo->symtab);
3866               if (status == ObjType::CFLV_OK)
3867                 {
3868                   // Currently we cannot handle a branch to a target in
3869                   // a merged section.  If this is the case, issue an error
3870                   // and also free the merge symbol value.
3871                   if (!symval.has_output_value())
3872                     {
3873                       const std::string& section_name =
3874                         object->section_name(shndx);
3875                       object->error(_("cannot handle branch to local %u "
3876                                           "in a merged section %s"),
3877                                         r_sym, section_name.c_str());
3878                     }
3879                   psymval = &symval;
3880                 }
3881               else
3882                 {
3883                   // We cannot determine the final value.
3884                   continue;
3885                 }
3886             }
3887         }
3888       else
3889         {
3890           const Symbol* gsym;
3891           gsym = object->global_symbol(r_sym);
3892           gold_assert(gsym != NULL);
3893           if (gsym->is_forwarder())
3894             gsym = relinfo->symtab->resolve_forwards(gsym);
3895
3896           sym = static_cast<const Sized_symbol<size>*>(gsym);
3897           if (sym->has_symtab_index() && sym->symtab_index() != -1U)
3898             symval.set_output_symtab_index(sym->symtab_index());
3899           else
3900             symval.set_no_output_symtab_entry();
3901
3902           // We need to compute the would-be final value of this global
3903           // symbol.
3904           const Symbol_table* symtab = relinfo->symtab;
3905           const Sized_symbol<size>* sized_symbol =
3906               symtab->get_sized_symbol<size>(gsym);
3907           Symbol_table::Compute_final_value_status status;
3908           typename elfcpp::Elf_types<size>::Elf_Addr value =
3909               symtab->compute_final_value<size>(sized_symbol, &status);
3910
3911           // Skip this if the symbol has not output section.
3912           if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION)
3913             continue;
3914           symval.set_output_value(value);
3915
3916           if (gsym->type() == elfcpp::STT_TLS)
3917             symval.set_is_tls_symbol();
3918           else if (gsym->type() == elfcpp::STT_GNU_IFUNC)
3919             symval.set_is_ifunc_symbol();
3920           psymval = &symval;
3921
3922           is_defined_in_discarded_section =
3923               (gsym->is_defined_in_discarded_section()
3924                && gsym->is_undefined());
3925           shndx = 0;
3926         }
3927
3928       Symbol_value<size> symval2;
3929       if (is_defined_in_discarded_section)
3930         {
3931           if (comdat_behavior == CB_UNDETERMINED)
3932             {
3933               std::string name = object->section_name(relinfo->data_shndx);
3934               comdat_behavior = default_comdat_behavior.get(name.c_str());
3935             }
3936           if (comdat_behavior == CB_PRETEND)
3937             {
3938               bool found;
3939               typename elfcpp::Elf_types<size>::Elf_Addr value =
3940                 object->map_to_kept_section(shndx, &found);
3941               if (found)
3942                 symval2.set_output_value(value + psymval->input_value());
3943               else
3944                 symval2.set_output_value(0);
3945             }
3946           else
3947             {
3948               if (comdat_behavior == CB_WARNING)
3949                 gold_warning_at_location(relinfo, i, offset,
3950                                          _("relocation refers to discarded "
3951                                            "section"));
3952               symval2.set_output_value(0);
3953             }
3954           symval2.set_no_output_symtab_entry();
3955           psymval = &symval2;
3956         }
3957
3958       // If symbol is a section symbol, we don't know the actual type of
3959       // destination.  Give up.
3960       if (psymval->is_section_symbol())
3961         continue;
3962
3963       this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval,
3964                                 addend, view_address + offset);
3965     }  // End of iterating relocs in a section
3966 }  // End of Target_aarch64::scan_reloc_section_for_stubs
3967
3968
3969 // Scan an input section for stub generation.
3970
3971 template<int size, bool big_endian>
3972 void
3973 Target_aarch64<size, big_endian>::scan_section_for_stubs(
3974     const Relocate_info<size, big_endian>* relinfo,
3975     unsigned int sh_type,
3976     const unsigned char* prelocs,
3977     size_t reloc_count,
3978     Output_section* output_section,
3979     bool needs_special_offset_handling,
3980     const unsigned char* view,
3981     Address view_address,
3982     section_size_type view_size)
3983 {
3984   gold_assert(sh_type == elfcpp::SHT_RELA);
3985   this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>(
3986       relinfo,
3987       prelocs,
3988       reloc_count,
3989       output_section,
3990       needs_special_offset_handling,
3991       view,
3992       view_address,
3993       view_size);
3994 }
3995
3996
3997 // Relocate a single stub.
3998
3999 template<int size, bool big_endian>
4000 void Target_aarch64<size, big_endian>::
4001 relocate_stub(The_reloc_stub* stub,
4002               const The_relocate_info*,
4003               Output_section*,
4004               unsigned char* view,
4005               Address address,
4006               section_size_type)
4007 {
4008   typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions;
4009   typedef typename The_reloc_functions::Status The_reloc_functions_status;
4010   typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
4011
4012   Insntype* ip = reinterpret_cast<Insntype*>(view);
4013   int insn_number = stub->insn_num();
4014   const uint32_t* insns = stub->insns();
4015   // Check the insns are really those stub insns.
4016   for (int i = 0; i < insn_number; ++i)
4017     {
4018       Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i);
4019       gold_assert(((uint32_t)insn == insns[i]));
4020     }
4021
4022   Address dest = stub->destination_address();
4023
4024   switch(stub->type())
4025     {
4026     case ST_ADRP_BRANCH:
4027       {
4028         // 1st reloc is ADR_PREL_PG_HI21
4029         The_reloc_functions_status status =
4030             The_reloc_functions::adrp(view, dest, address);
4031         // An error should never arise in the above step. If so, please
4032         // check 'aarch64_valid_for_adrp_p'.
4033         gold_assert(status == The_reloc_functions::STATUS_OKAY);
4034
4035         // 2nd reloc is ADD_ABS_LO12_NC
4036         const AArch64_reloc_property* arp =
4037             aarch64_reloc_property_table->get_reloc_property(
4038                 elfcpp::R_AARCH64_ADD_ABS_LO12_NC);
4039         gold_assert(arp != NULL);
4040         status = The_reloc_functions::template
4041             rela_general<32>(view + 4, dest, 0, arp);
4042         // An error should never arise, it is an "_NC" relocation.
4043         gold_assert(status == The_reloc_functions::STATUS_OKAY);
4044       }
4045       break;
4046
4047     case ST_LONG_BRANCH_ABS:
4048       // 1st reloc is R_AARCH64_PREL64, at offset 8
4049       elfcpp::Swap<64,big_endian>::writeval(view + 8, dest);
4050       break;
4051
4052     case ST_LONG_BRANCH_PCREL:
4053       {
4054         // "PC" calculation is the 2nd insn in the stub.
4055         uint64_t offset = dest - (address + 4);
4056         // Offset is placed at offset 4 and 5.
4057         elfcpp::Swap<64,big_endian>::writeval(view + 16, offset);
4058       }
4059       break;
4060
4061     default:
4062       gold_unreachable();
4063     }
4064 }
4065
4066
4067 // A class to handle the PLT data.
4068 // This is an abstract base class that handles most of the linker details
4069 // but does not know the actual contents of PLT entries.  The derived
4070 // classes below fill in those details.
4071
4072 template<int size, bool big_endian>
4073 class Output_data_plt_aarch64 : public Output_section_data
4074 {
4075  public:
4076   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
4077       Reloc_section;
4078   typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4079
4080   Output_data_plt_aarch64(Layout* layout,
4081                           uint64_t addralign,
4082                           Output_data_got_aarch64<size, big_endian>* got,
4083                           Output_data_space* got_plt,
4084                           Output_data_space* got_irelative)
4085     : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL),
4086       got_(got), got_plt_(got_plt), got_irelative_(got_irelative),
4087       count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4088   { this->init(layout); }
4089
4090   // Initialize the PLT section.
4091   void
4092   init(Layout* layout);
4093
4094   // Add an entry to the PLT.
4095   void
4096   add_entry(Symbol_table*, Layout*, Symbol* gsym);
4097
4098   // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4099   unsigned int
4100   add_local_ifunc_entry(Symbol_table* symtab, Layout*,
4101                         Sized_relobj_file<size, big_endian>* relobj,
4102                         unsigned int local_sym_index);
4103
4104   // Add the relocation for a PLT entry.
4105   void
4106   add_relocation(Symbol_table*, Layout*, Symbol* gsym,
4107                  unsigned int got_offset);
4108
4109   // Add the reserved TLSDESC_PLT entry to the PLT.
4110   void
4111   reserve_tlsdesc_entry(unsigned int got_offset)
4112   { this->tlsdesc_got_offset_ = got_offset; }
4113
4114   // Return true if a TLSDESC_PLT entry has been reserved.
4115   bool
4116   has_tlsdesc_entry() const
4117   { return this->tlsdesc_got_offset_ != -1U; }
4118
4119   // Return the GOT offset for the reserved TLSDESC_PLT entry.
4120   unsigned int
4121   get_tlsdesc_got_offset() const
4122   { return this->tlsdesc_got_offset_; }
4123
4124   // Return the PLT offset of the reserved TLSDESC_PLT entry.
4125   unsigned int
4126   get_tlsdesc_plt_offset() const
4127   {
4128     return (this->first_plt_entry_offset() +
4129             (this->count_ + this->irelative_count_)
4130             * this->get_plt_entry_size());
4131   }
4132
4133   // Return the .rela.plt section data.
4134   Reloc_section*
4135   rela_plt()
4136   { return this->rel_; }
4137
4138   // Return where the TLSDESC relocations should go.
4139   Reloc_section*
4140   rela_tlsdesc(Layout*);
4141
4142   // Return where the IRELATIVE relocations should go in the PLT
4143   // relocations.
4144   Reloc_section*
4145   rela_irelative(Symbol_table*, Layout*);
4146
4147   // Return whether we created a section for IRELATIVE relocations.
4148   bool
4149   has_irelative_section() const
4150   { return this->irelative_rel_ != NULL; }
4151
4152   // Return the number of PLT entries.
4153   unsigned int
4154   entry_count() const
4155   { return this->count_ + this->irelative_count_; }
4156
4157   // Return the offset of the first non-reserved PLT entry.
4158   unsigned int
4159   first_plt_entry_offset() const
4160   { return this->do_first_plt_entry_offset(); }
4161
4162   // Return the size of a PLT entry.
4163   unsigned int
4164   get_plt_entry_size() const
4165   { return this->do_get_plt_entry_size(); }
4166
4167   // Return the reserved tlsdesc entry size.
4168   unsigned int
4169   get_plt_tlsdesc_entry_size() const
4170   { return this->do_get_plt_tlsdesc_entry_size(); }
4171
4172   // Return the PLT address to use for a global symbol.
4173   uint64_t
4174   address_for_global(const Symbol*);
4175
4176   // Return the PLT address to use for a local symbol.
4177   uint64_t
4178   address_for_local(const Relobj*, unsigned int symndx);
4179
4180  protected:
4181   // Fill in the first PLT entry.
4182   void
4183   fill_first_plt_entry(unsigned char* pov,
4184                        Address got_address,
4185                        Address plt_address)
4186   { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
4187
4188   // Fill in a normal PLT entry.
4189   void
4190   fill_plt_entry(unsigned char* pov,
4191                  Address got_address,
4192                  Address plt_address,
4193                  unsigned int got_offset,
4194                  unsigned int plt_offset)
4195   {
4196     this->do_fill_plt_entry(pov, got_address, plt_address,
4197                             got_offset, plt_offset);
4198   }
4199
4200   // Fill in the reserved TLSDESC PLT entry.
4201   void
4202   fill_tlsdesc_entry(unsigned char* pov,
4203                      Address gotplt_address,
4204                      Address plt_address,
4205                      Address got_base,
4206                      unsigned int tlsdesc_got_offset,
4207                      unsigned int plt_offset)
4208   {
4209     this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
4210                                 tlsdesc_got_offset, plt_offset);
4211   }
4212
4213   virtual unsigned int
4214   do_first_plt_entry_offset() const = 0;
4215
4216   virtual unsigned int
4217   do_get_plt_entry_size() const = 0;
4218
4219   virtual unsigned int
4220   do_get_plt_tlsdesc_entry_size() const = 0;
4221
4222   virtual void
4223   do_fill_first_plt_entry(unsigned char* pov,
4224                           Address got_addr,
4225                           Address plt_addr) = 0;
4226
4227   virtual void
4228   do_fill_plt_entry(unsigned char* pov,
4229                     Address got_address,
4230                     Address plt_address,
4231                     unsigned int got_offset,
4232                     unsigned int plt_offset) = 0;
4233
4234   virtual void
4235   do_fill_tlsdesc_entry(unsigned char* pov,
4236                         Address gotplt_address,
4237                         Address plt_address,
4238                         Address got_base,
4239                         unsigned int tlsdesc_got_offset,
4240                         unsigned int plt_offset) = 0;
4241
4242   void
4243   do_adjust_output_section(Output_section* os);
4244
4245   // Write to a map file.
4246   void
4247   do_print_to_mapfile(Mapfile* mapfile) const
4248   { mapfile->print_output_data(this, _("** PLT")); }
4249
4250  private:
4251   // Set the final size.
4252   void
4253   set_final_data_size();
4254
4255   // Write out the PLT data.
4256   void
4257   do_write(Output_file*);
4258
4259   // The reloc section.
4260   Reloc_section* rel_;
4261
4262   // The TLSDESC relocs, if necessary.  These must follow the regular
4263   // PLT relocs.
4264   Reloc_section* tlsdesc_rel_;
4265
4266   // The IRELATIVE relocs, if necessary.  These must follow the
4267   // regular PLT relocations.
4268   Reloc_section* irelative_rel_;
4269
4270   // The .got section.
4271   Output_data_got_aarch64<size, big_endian>* got_;
4272
4273   // The .got.plt section.
4274   Output_data_space* got_plt_;
4275
4276   // The part of the .got.plt section used for IRELATIVE relocs.
4277   Output_data_space* got_irelative_;
4278
4279   // The number of PLT entries.
4280   unsigned int count_;
4281
4282   // Number of PLT entries with R_AARCH64_IRELATIVE relocs.  These
4283   // follow the regular PLT entries.
4284   unsigned int irelative_count_;
4285
4286   // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4287   // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4288   // indicates an offset is not allocated.
4289   unsigned int tlsdesc_got_offset_;
4290 };
4291
4292 // Initialize the PLT section.
4293
4294 template<int size, bool big_endian>
4295 void
4296 Output_data_plt_aarch64<size, big_endian>::init(Layout* layout)
4297 {
4298   this->rel_ = new Reloc_section(false);
4299   layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4300                                   elfcpp::SHF_ALLOC, this->rel_,
4301                                   ORDER_DYNAMIC_PLT_RELOCS, false);
4302 }
4303
4304 template<int size, bool big_endian>
4305 void
4306 Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section(
4307     Output_section* os)
4308 {
4309   os->set_entsize(this->get_plt_entry_size());
4310 }
4311
4312 // Add an entry to the PLT.
4313
4314 template<int size, bool big_endian>
4315 void
4316 Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab,
4317     Layout* layout, Symbol* gsym)
4318 {
4319   gold_assert(!gsym->has_plt_offset());
4320
4321   unsigned int* pcount;
4322   unsigned int plt_reserved;
4323   Output_section_data_build* got;
4324
4325   if (gsym->type() == elfcpp::STT_GNU_IFUNC
4326       && gsym->can_use_relative_reloc(false))
4327     {
4328       pcount = &this->irelative_count_;
4329       plt_reserved = 0;
4330       got = this->got_irelative_;
4331     }
4332   else
4333     {
4334       pcount = &this->count_;
4335       plt_reserved = this->first_plt_entry_offset();
4336       got = this->got_plt_;
4337     }
4338
4339   gsym->set_plt_offset((*pcount) * this->get_plt_entry_size()
4340                        + plt_reserved);
4341
4342   ++*pcount;
4343
4344   section_offset_type got_offset = got->current_data_size();
4345
4346   // Every PLT entry needs a GOT entry which points back to the PLT
4347   // entry (this will be changed by the dynamic linker, normally
4348   // lazily when the function is called).
4349   got->set_current_data_size(got_offset + size / 8);
4350
4351   // Every PLT entry needs a reloc.
4352   this->add_relocation(symtab, layout, gsym, got_offset);
4353
4354   // Note that we don't need to save the symbol. The contents of the
4355   // PLT are independent of which symbols are used. The symbols only
4356   // appear in the relocations.
4357 }
4358
4359 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.  Return
4360 // the PLT offset.
4361
4362 template<int size, bool big_endian>
4363 unsigned int
4364 Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry(
4365     Symbol_table* symtab,
4366     Layout* layout,
4367     Sized_relobj_file<size, big_endian>* relobj,
4368     unsigned int local_sym_index)
4369 {
4370   unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
4371   ++this->irelative_count_;
4372
4373   section_offset_type got_offset = this->got_irelative_->current_data_size();
4374
4375   // Every PLT entry needs a GOT entry which points back to the PLT
4376   // entry.
4377   this->got_irelative_->set_current_data_size(got_offset + size / 8);
4378
4379   // Every PLT entry needs a reloc.
4380   Reloc_section* rela = this->rela_irelative(symtab, layout);
4381   rela->add_symbolless_local_addend(relobj, local_sym_index,
4382                                     elfcpp::R_AARCH64_IRELATIVE,
4383                                     this->got_irelative_, got_offset, 0);
4384
4385   return plt_offset;
4386 }
4387
4388 // Add the relocation for a PLT entry.
4389
4390 template<int size, bool big_endian>
4391 void
4392 Output_data_plt_aarch64<size, big_endian>::add_relocation(
4393     Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset)
4394 {
4395   if (gsym->type() == elfcpp::STT_GNU_IFUNC
4396       && gsym->can_use_relative_reloc(false))
4397     {
4398       Reloc_section* rela = this->rela_irelative(symtab, layout);
4399       rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE,
4400                                          this->got_irelative_, got_offset, 0);
4401     }
4402   else
4403     {
4404       gsym->set_needs_dynsym_entry();
4405       this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_,
4406                              got_offset, 0);
4407     }
4408 }
4409
4410 // Return where the TLSDESC relocations should go, creating it if
4411 // necessary.  These follow the JUMP_SLOT relocations.
4412
4413 template<int size, bool big_endian>
4414 typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
4415 Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout)
4416 {
4417   if (this->tlsdesc_rel_ == NULL)
4418     {
4419       this->tlsdesc_rel_ = new Reloc_section(false);
4420       layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4421                                       elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
4422                                       ORDER_DYNAMIC_PLT_RELOCS, false);
4423       gold_assert(this->tlsdesc_rel_->output_section()
4424                   == this->rel_->output_section());
4425     }
4426   return this->tlsdesc_rel_;
4427 }
4428
4429 // Return where the IRELATIVE relocations should go in the PLT.  These
4430 // follow the JUMP_SLOT and the TLSDESC relocations.
4431
4432 template<int size, bool big_endian>
4433 typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
4434 Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab,
4435                                                           Layout* layout)
4436 {
4437   if (this->irelative_rel_ == NULL)
4438     {
4439       // Make sure we have a place for the TLSDESC relocations, in
4440       // case we see any later on.
4441       this->rela_tlsdesc(layout);
4442       this->irelative_rel_ = new Reloc_section(false);
4443       layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4444                                       elfcpp::SHF_ALLOC, this->irelative_rel_,
4445                                       ORDER_DYNAMIC_PLT_RELOCS, false);
4446       gold_assert(this->irelative_rel_->output_section()
4447                   == this->rel_->output_section());
4448
4449       if (parameters->doing_static_link())
4450         {
4451           // A statically linked executable will only have a .rela.plt
4452           // section to hold R_AARCH64_IRELATIVE relocs for
4453           // STT_GNU_IFUNC symbols.  The library will use these
4454           // symbols to locate the IRELATIVE relocs at program startup
4455           // time.
4456           symtab->define_in_output_data("__rela_iplt_start", NULL,
4457                                         Symbol_table::PREDEFINED,
4458                                         this->irelative_rel_, 0, 0,
4459                                         elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
4460                                         elfcpp::STV_HIDDEN, 0, false, true);
4461           symtab->define_in_output_data("__rela_iplt_end", NULL,
4462                                         Symbol_table::PREDEFINED,
4463                                         this->irelative_rel_, 0, 0,
4464                                         elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
4465                                         elfcpp::STV_HIDDEN, 0, true, true);
4466         }
4467     }
4468   return this->irelative_rel_;
4469 }
4470
4471 // Return the PLT address to use for a global symbol.
4472
4473 template<int size, bool big_endian>
4474 uint64_t
4475 Output_data_plt_aarch64<size, big_endian>::address_for_global(
4476   const Symbol* gsym)
4477 {
4478   uint64_t offset = 0;
4479   if (gsym->type() == elfcpp::STT_GNU_IFUNC
4480       && gsym->can_use_relative_reloc(false))
4481     offset = (this->first_plt_entry_offset() +
4482               this->count_ * this->get_plt_entry_size());
4483   return this->address() + offset + gsym->plt_offset();
4484 }
4485
4486 // Return the PLT address to use for a local symbol.  These are always
4487 // IRELATIVE relocs.
4488
4489 template<int size, bool big_endian>
4490 uint64_t
4491 Output_data_plt_aarch64<size, big_endian>::address_for_local(
4492     const Relobj* object,
4493     unsigned int r_sym)
4494 {
4495   return (this->address()
4496           + this->first_plt_entry_offset()
4497           + this->count_ * this->get_plt_entry_size()
4498           + object->local_plt_offset(r_sym));
4499 }
4500
4501 // Set the final size.
4502
4503 template<int size, bool big_endian>
4504 void
4505 Output_data_plt_aarch64<size, big_endian>::set_final_data_size()
4506 {
4507   unsigned int count = this->count_ + this->irelative_count_;
4508   unsigned int extra_size = 0;
4509   if (this->has_tlsdesc_entry())
4510     extra_size += this->get_plt_tlsdesc_entry_size();
4511   this->set_data_size(this->first_plt_entry_offset()
4512                       + count * this->get_plt_entry_size()
4513                       + extra_size);
4514 }
4515
4516 template<int size, bool big_endian>
4517 class Output_data_plt_aarch64_standard :
4518   public Output_data_plt_aarch64<size, big_endian>
4519 {
4520  public:
4521   typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4522   Output_data_plt_aarch64_standard(
4523       Layout* layout,
4524       Output_data_got_aarch64<size, big_endian>* got,
4525       Output_data_space* got_plt,
4526       Output_data_space* got_irelative)
4527     : Output_data_plt_aarch64<size, big_endian>(layout,
4528                                                 size == 32 ? 4 : 8,
4529                                                 got, got_plt,
4530                                                 got_irelative)
4531   { }
4532
4533  protected:
4534   // Return the offset of the first non-reserved PLT entry.
4535   virtual unsigned int
4536   do_first_plt_entry_offset() const
4537   { return this->first_plt_entry_size; }
4538
4539   // Return the size of a PLT entry
4540   virtual unsigned int
4541   do_get_plt_entry_size() const
4542   { return this->plt_entry_size; }
4543
4544   // Return the size of a tlsdesc entry
4545   virtual unsigned int
4546   do_get_plt_tlsdesc_entry_size() const
4547   { return this->plt_tlsdesc_entry_size; }
4548
4549   virtual void
4550   do_fill_first_plt_entry(unsigned char* pov,
4551                           Address got_address,
4552                           Address plt_address);
4553
4554   virtual void
4555   do_fill_plt_entry(unsigned char* pov,
4556                     Address got_address,
4557                     Address plt_address,
4558                     unsigned int got_offset,
4559                     unsigned int plt_offset);
4560
4561   virtual void
4562   do_fill_tlsdesc_entry(unsigned char* pov,
4563                         Address gotplt_address,
4564                         Address plt_address,
4565                         Address got_base,
4566                         unsigned int tlsdesc_got_offset,
4567                         unsigned int plt_offset);
4568
4569  private:
4570   // The size of the first plt entry size.
4571   static const int first_plt_entry_size = 32;
4572   // The size of the plt entry size.
4573   static const int plt_entry_size = 16;
4574   // The size of the plt tlsdesc entry size.
4575   static const int plt_tlsdesc_entry_size = 32;
4576   // Template for the first PLT entry.
4577   static const uint32_t first_plt_entry[first_plt_entry_size / 4];
4578   // Template for subsequent PLT entries.
4579   static const uint32_t plt_entry[plt_entry_size / 4];
4580   // The reserved TLSDESC entry in the PLT for an executable.
4581   static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4];
4582 };
4583
4584 // The first entry in the PLT for an executable.
4585
4586 template<>
4587 const uint32_t
4588 Output_data_plt_aarch64_standard<32, false>::
4589     first_plt_entry[first_plt_entry_size / 4] =
4590 {
4591   0xa9bf7bf0,   /* stp x16, x30, [sp, #-16]!  */
4592   0x90000010,   /* adrp x16, PLT_GOT+0x8  */
4593   0xb9400A11,   /* ldr w17, [x16, #PLT_GOT+0x8]  */
4594   0x11002210,   /* add w16, w16,#PLT_GOT+0x8   */
4595   0xd61f0220,   /* br x17  */
4596   0xd503201f,   /* nop */
4597   0xd503201f,   /* nop */
4598   0xd503201f,   /* nop */
4599 };
4600
4601
4602 template<>
4603 const uint32_t
4604 Output_data_plt_aarch64_standard<32, true>::
4605     first_plt_entry[first_plt_entry_size / 4] =
4606 {
4607   0xa9bf7bf0,   /* stp x16, x30, [sp, #-16]!  */
4608   0x90000010,   /* adrp x16, PLT_GOT+0x8  */
4609   0xb9400A11,   /* ldr w17, [x16, #PLT_GOT+0x8]  */
4610   0x11002210,   /* add w16, w16,#PLT_GOT+0x8   */
4611   0xd61f0220,   /* br x17  */
4612   0xd503201f,   /* nop */
4613   0xd503201f,   /* nop */
4614   0xd503201f,   /* nop */
4615 };
4616
4617
4618 template<>
4619 const uint32_t
4620 Output_data_plt_aarch64_standard<64, false>::
4621     first_plt_entry[first_plt_entry_size / 4] =
4622 {
4623   0xa9bf7bf0,   /* stp x16, x30, [sp, #-16]!  */
4624   0x90000010,   /* adrp x16, PLT_GOT+16  */
4625   0xf9400A11,   /* ldr x17, [x16, #PLT_GOT+0x10]  */
4626   0x91004210,   /* add x16, x16,#PLT_GOT+0x10   */
4627   0xd61f0220,   /* br x17  */
4628   0xd503201f,   /* nop */
4629   0xd503201f,   /* nop */
4630   0xd503201f,   /* nop */
4631 };
4632
4633
4634 template<>
4635 const uint32_t
4636 Output_data_plt_aarch64_standard<64, true>::
4637     first_plt_entry[first_plt_entry_size / 4] =
4638 {
4639   0xa9bf7bf0,   /* stp x16, x30, [sp, #-16]!  */
4640   0x90000010,   /* adrp x16, PLT_GOT+16  */
4641   0xf9400A11,   /* ldr x17, [x16, #PLT_GOT+0x10]  */
4642   0x91004210,   /* add x16, x16,#PLT_GOT+0x10   */
4643   0xd61f0220,   /* br x17  */
4644   0xd503201f,   /* nop */
4645   0xd503201f,   /* nop */
4646   0xd503201f,   /* nop */
4647 };
4648
4649
4650 template<>
4651 const uint32_t
4652 Output_data_plt_aarch64_standard<32, false>::
4653     plt_entry[plt_entry_size / 4] =
4654 {
4655   0x90000010,   /* adrp x16, PLTGOT + n * 4  */
4656   0xb9400211,   /* ldr w17, [w16, PLTGOT + n * 4] */
4657   0x11000210,   /* add w16, w16, :lo12:PLTGOT + n * 4  */
4658   0xd61f0220,   /* br x17.  */
4659 };
4660
4661
4662 template<>
4663 const uint32_t
4664 Output_data_plt_aarch64_standard<32, true>::
4665     plt_entry[plt_entry_size / 4] =
4666 {
4667   0x90000010,   /* adrp x16, PLTGOT + n * 4  */
4668   0xb9400211,   /* ldr w17, [w16, PLTGOT + n * 4] */
4669   0x11000210,   /* add w16, w16, :lo12:PLTGOT + n * 4  */
4670   0xd61f0220,   /* br x17.  */
4671 };
4672
4673
4674 template<>
4675 const uint32_t
4676 Output_data_plt_aarch64_standard<64, false>::
4677     plt_entry[plt_entry_size / 4] =
4678 {
4679   0x90000010,   /* adrp x16, PLTGOT + n * 8  */
4680   0xf9400211,   /* ldr x17, [x16, PLTGOT + n * 8] */
4681   0x91000210,   /* add x16, x16, :lo12:PLTGOT + n * 8  */
4682   0xd61f0220,   /* br x17.  */
4683 };
4684
4685
4686 template<>
4687 const uint32_t
4688 Output_data_plt_aarch64_standard<64, true>::
4689     plt_entry[plt_entry_size / 4] =
4690 {
4691   0x90000010,   /* adrp x16, PLTGOT + n * 8  */
4692   0xf9400211,   /* ldr x17, [x16, PLTGOT + n * 8] */
4693   0x91000210,   /* add x16, x16, :lo12:PLTGOT + n * 8  */
4694   0xd61f0220,   /* br x17.  */
4695 };
4696
4697
4698 template<int size, bool big_endian>
4699 void
4700 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry(
4701     unsigned char* pov,
4702     Address got_address,
4703     Address plt_address)
4704 {
4705   // PLT0 of the small PLT looks like this in ELF64 -
4706   // stp x16, x30, [sp, #-16]!          Save the reloc and lr on stack.
4707   // adrp x16, PLT_GOT + 16             Get the page base of the GOTPLT
4708   // ldr  x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4709   //                                    symbol resolver
4710   // add  x16, x16, #:lo12:PLT_GOT+16   Load the lo12 bits of the
4711   //                                    GOTPLT entry for this.
4712   // br   x17
4713   // PLT0 will be slightly different in ELF32 due to different got entry
4714   // size.
4715   memcpy(pov, this->first_plt_entry, this->first_plt_entry_size);
4716   Address gotplt_2nd_ent = got_address + (size / 8) * 2;
4717
4718   // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4719   // ADRP:  (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4720   // FIXME: This only works for 64bit
4721   AArch64_relocate_functions<size, big_endian>::adrp(pov + 4,
4722       gotplt_2nd_ent, plt_address + 4);
4723
4724   // Fill in R_AARCH64_LDST8_LO12
4725   elfcpp::Swap<32, big_endian>::writeval(
4726       pov + 8,
4727       ((this->first_plt_entry[2] & 0xffc003ff)
4728        | ((gotplt_2nd_ent & 0xff8) << 7)));
4729
4730   // Fill in R_AARCH64_ADD_ABS_LO12
4731   elfcpp::Swap<32, big_endian>::writeval(
4732       pov + 12,
4733       ((this->first_plt_entry[3] & 0xffc003ff)
4734        | ((gotplt_2nd_ent & 0xfff) << 10)));
4735 }
4736
4737
4738 // Subsequent entries in the PLT for an executable.
4739 // FIXME: This only works for 64bit
4740
4741 template<int size, bool big_endian>
4742 void
4743 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry(
4744     unsigned char* pov,
4745     Address got_address,
4746     Address plt_address,
4747     unsigned int got_offset,
4748     unsigned int plt_offset)
4749 {
4750   memcpy(pov, this->plt_entry, this->plt_entry_size);
4751
4752   Address gotplt_entry_address = got_address + got_offset;
4753   Address plt_entry_address = plt_address + plt_offset;
4754
4755   // Fill in R_AARCH64_PCREL_ADR_HI21
4756   AArch64_relocate_functions<size, big_endian>::adrp(
4757       pov,
4758       gotplt_entry_address,
4759       plt_entry_address);
4760
4761   // Fill in R_AARCH64_LDST64_ABS_LO12
4762   elfcpp::Swap<32, big_endian>::writeval(
4763       pov + 4,
4764       ((this->plt_entry[1] & 0xffc003ff)
4765        | ((gotplt_entry_address & 0xff8) << 7)));
4766
4767   // Fill in R_AARCH64_ADD_ABS_LO12
4768   elfcpp::Swap<32, big_endian>::writeval(
4769       pov + 8,
4770       ((this->plt_entry[2] & 0xffc003ff)
4771        | ((gotplt_entry_address & 0xfff) <<10)));
4772
4773 }
4774
4775
4776 template<>
4777 const uint32_t
4778 Output_data_plt_aarch64_standard<32, false>::
4779     tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4780 {
4781   0xa9bf0fe2,   /* stp x2, x3, [sp, #-16]!  */
4782   0x90000002,   /* adrp x2, 0 */
4783   0x90000003,   /* adrp x3, 0 */
4784   0xb9400042,   /* ldr w2, [w2, #0] */
4785   0x11000063,   /* add w3, w3, 0 */
4786   0xd61f0040,   /* br x2 */
4787   0xd503201f,   /* nop */
4788   0xd503201f,   /* nop */
4789 };
4790
4791 template<>
4792 const uint32_t
4793 Output_data_plt_aarch64_standard<32, true>::
4794     tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4795 {
4796   0xa9bf0fe2,   /* stp x2, x3, [sp, #-16]!  */
4797   0x90000002,   /* adrp x2, 0 */
4798   0x90000003,   /* adrp x3, 0 */
4799   0xb9400042,   /* ldr w2, [w2, #0] */
4800   0x11000063,   /* add w3, w3, 0 */
4801   0xd61f0040,   /* br x2 */
4802   0xd503201f,   /* nop */
4803   0xd503201f,   /* nop */
4804 };
4805
4806 template<>
4807 const uint32_t
4808 Output_data_plt_aarch64_standard<64, false>::
4809     tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4810 {
4811   0xa9bf0fe2,   /* stp x2, x3, [sp, #-16]!  */
4812   0x90000002,   /* adrp x2, 0 */
4813   0x90000003,   /* adrp x3, 0 */
4814   0xf9400042,   /* ldr x2, [x2, #0] */
4815   0x91000063,   /* add x3, x3, 0 */
4816   0xd61f0040,   /* br x2 */
4817   0xd503201f,   /* nop */
4818   0xd503201f,   /* nop */
4819 };
4820
4821 template<>
4822 const uint32_t
4823 Output_data_plt_aarch64_standard<64, true>::
4824     tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4825 {
4826   0xa9bf0fe2,   /* stp x2, x3, [sp, #-16]!  */
4827   0x90000002,   /* adrp x2, 0 */
4828   0x90000003,   /* adrp x3, 0 */
4829   0xf9400042,   /* ldr x2, [x2, #0] */
4830   0x91000063,   /* add x3, x3, 0 */
4831   0xd61f0040,   /* br x2 */
4832   0xd503201f,   /* nop */
4833   0xd503201f,   /* nop */
4834 };
4835
4836 template<int size, bool big_endian>
4837 void
4838 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry(
4839     unsigned char* pov,
4840     Address gotplt_address,
4841     Address plt_address,
4842     Address got_base,
4843     unsigned int tlsdesc_got_offset,
4844     unsigned int plt_offset)
4845 {
4846   memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size);
4847
4848   // move DT_TLSDESC_GOT address into x2
4849   // move .got.plt address into x3
4850   Address tlsdesc_got_entry = got_base + tlsdesc_got_offset;
4851   Address plt_entry_address = plt_address + plt_offset;
4852
4853   // R_AARCH64_ADR_PREL_PG_HI21
4854   AArch64_relocate_functions<size, big_endian>::adrp(
4855       pov + 4,
4856       tlsdesc_got_entry,
4857       plt_entry_address + 4);
4858
4859   // R_AARCH64_ADR_PREL_PG_HI21
4860   AArch64_relocate_functions<size, big_endian>::adrp(
4861       pov + 8,
4862       gotplt_address,
4863       plt_entry_address + 8);
4864
4865   // R_AARCH64_LDST64_ABS_LO12
4866   elfcpp::Swap<32, big_endian>::writeval(
4867       pov + 12,
4868       ((this->tlsdesc_plt_entry[3] & 0xffc003ff)
4869        | ((tlsdesc_got_entry & 0xff8) << 7)));
4870
4871   // R_AARCH64_ADD_ABS_LO12
4872   elfcpp::Swap<32, big_endian>::writeval(
4873       pov + 16,
4874       ((this->tlsdesc_plt_entry[4] & 0xffc003ff)
4875        | ((gotplt_address & 0xfff) << 10)));
4876 }
4877
4878 // Write out the PLT.  This uses the hand-coded instructions above,
4879 // and adjusts them as needed.  This is specified by the AMD64 ABI.
4880
4881 template<int size, bool big_endian>
4882 void
4883 Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of)
4884 {
4885   const off_t offset = this->offset();
4886   const section_size_type oview_size =
4887     convert_to_section_size_type(this->data_size());
4888   unsigned char* const oview = of->get_output_view(offset, oview_size);
4889
4890   const off_t got_file_offset = this->got_plt_->offset();
4891   gold_assert(got_file_offset + this->got_plt_->data_size()
4892               == this->got_irelative_->offset());
4893
4894   const section_size_type got_size =
4895       convert_to_section_size_type(this->got_plt_->data_size()
4896                                    + this->got_irelative_->data_size());
4897   unsigned char* const got_view = of->get_output_view(got_file_offset,
4898                                                       got_size);
4899
4900   unsigned char* pov = oview;
4901
4902   // The base address of the .plt section.
4903   typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
4904   // The base address of the PLT portion of the .got section.
4905   typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address
4906       = this->got_plt_->address();
4907
4908   this->fill_first_plt_entry(pov, gotplt_address, plt_address);
4909   pov += this->first_plt_entry_offset();
4910
4911   // The first three entries in .got.plt are reserved.
4912   unsigned char* got_pov = got_view;
4913   memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT);
4914   got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
4915
4916   unsigned int plt_offset = this->first_plt_entry_offset();
4917   unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
4918   const unsigned int count = this->count_ + this->irelative_count_;
4919   for (unsigned int plt_index = 0;
4920        plt_index < count;
4921        ++plt_index,
4922          pov += this->get_plt_entry_size(),
4923          got_pov += size / 8,
4924          plt_offset += this->get_plt_entry_size(),
4925          got_offset += size / 8)
4926     {
4927       // Set and adjust the PLT entry itself.
4928       this->fill_plt_entry(pov, gotplt_address, plt_address,
4929                            got_offset, plt_offset);
4930
4931       // Set the entry in the GOT, which points to plt0.
4932       elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address);
4933     }
4934
4935   if (this->has_tlsdesc_entry())
4936     {
4937       // Set and adjust the reserved TLSDESC PLT entry.
4938       unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
4939       // The base address of the .base section.
4940       typename elfcpp::Elf_types<size>::Elf_Addr got_base =
4941           this->got_->address();
4942       this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
4943                                tlsdesc_got_offset, plt_offset);
4944       pov += this->get_plt_tlsdesc_entry_size();
4945     }
4946
4947   gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
4948   gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
4949
4950   of->write_output_view(offset, oview_size, oview);
4951   of->write_output_view(got_file_offset, got_size, got_view);
4952 }
4953
4954 // Telling how to update the immediate field of an instruction.
4955 struct AArch64_howto
4956 {
4957   // The immediate field mask.
4958   elfcpp::Elf_Xword dst_mask;
4959
4960   // The offset to apply relocation immediate
4961   int doffset;
4962
4963   // The second part offset, if the immediate field has two parts.
4964   // -1 if the immediate field has only one part.
4965   int doffset2;
4966 };
4967
4968 static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] =
4969 {
4970   {0, -1, -1},          // DATA
4971   {0x1fffe0, 5, -1},    // MOVW  [20:5]-imm16
4972   {0xffffe0, 5, -1},    // LD    [23:5]-imm19
4973   {0x60ffffe0, 29, 5},  // ADR   [30:29]-immlo  [23:5]-immhi
4974   {0x60ffffe0, 29, 5},  // ADRP  [30:29]-immlo  [23:5]-immhi
4975   {0x3ffc00, 10, -1},   // ADD   [21:10]-imm12
4976   {0x3ffc00, 10, -1},   // LDST  [21:10]-imm12
4977   {0x7ffe0, 5, -1},     // TBZNZ [18:5]-imm14
4978   {0xffffe0, 5, -1},    // CONDB [23:5]-imm19
4979   {0x3ffffff, 0, -1},   // B     [25:0]-imm26
4980   {0x3ffffff, 0, -1},   // CALL  [25:0]-imm26
4981 };
4982
4983 // AArch64 relocate function class
4984
4985 template<int size, bool big_endian>
4986 class AArch64_relocate_functions
4987 {
4988  public:
4989   typedef enum
4990   {
4991     STATUS_OKAY,        // No error during relocation.
4992     STATUS_OVERFLOW,    // Relocation overflow.
4993     STATUS_BAD_RELOC,   // Relocation cannot be applied.
4994   } Status;
4995
4996   typedef AArch64_relocate_functions<size, big_endian> This;
4997   typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4998   typedef Relocate_info<size, big_endian> The_relocate_info;
4999   typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
5000   typedef Reloc_stub<size, big_endian> The_reloc_stub;
5001   typedef Stub_table<size, big_endian> The_stub_table;
5002   typedef elfcpp::Rela<size, big_endian> The_rela;
5003   typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype;
5004
5005   // Return the page address of the address.
5006   // Page(address) = address & ~0xFFF
5007
5008   static inline AArch64_valtype
5009   Page(Address address)
5010   {
5011     return (address & (~static_cast<Address>(0xFFF)));
5012   }
5013
5014  private:
5015   // Update instruction (pointed by view) with selected bits (immed).
5016   // val = (val & ~dst_mask) | (immed << doffset)
5017
5018   template<int valsize>
5019   static inline void
5020   update_view(unsigned char* view,
5021               AArch64_valtype immed,
5022               elfcpp::Elf_Xword doffset,
5023               elfcpp::Elf_Xword dst_mask)
5024   {
5025     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5026     Valtype* wv = reinterpret_cast<Valtype*>(view);
5027     Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
5028
5029     // Clear immediate fields.
5030     val &= ~dst_mask;
5031     elfcpp::Swap<valsize, big_endian>::writeval(wv,
5032       static_cast<Valtype>(val | (immed << doffset)));
5033   }
5034
5035   // Update two parts of an instruction (pointed by view) with selected
5036   // bits (immed1 and immed2).
5037   // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5038
5039   template<int valsize>
5040   static inline void
5041   update_view_two_parts(
5042     unsigned char* view,
5043     AArch64_valtype immed1,
5044     AArch64_valtype immed2,
5045     elfcpp::Elf_Xword doffset1,
5046     elfcpp::Elf_Xword doffset2,
5047     elfcpp::Elf_Xword dst_mask)
5048   {
5049     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5050     Valtype* wv = reinterpret_cast<Valtype*>(view);
5051     Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
5052     val &= ~dst_mask;
5053     elfcpp::Swap<valsize, big_endian>::writeval(wv,
5054       static_cast<Valtype>(val | (immed1 << doffset1) |
5055                            (immed2 << doffset2)));
5056   }
5057
5058   // Update adr or adrp instruction with immed.
5059   // In adr and adrp: [30:29] immlo   [23:5] immhi
5060
5061   static inline void
5062   update_adr(unsigned char* view, AArch64_valtype immed)
5063   {
5064     elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5);
5065     This::template update_view_two_parts<32>(
5066       view,
5067       immed & 0x3,
5068       (immed & 0x1ffffc) >> 2,
5069       29,
5070       5,
5071       dst_mask);
5072   }
5073
5074   // Update movz/movn instruction with bits immed.
5075   // Set instruction to movz if is_movz is true, otherwise set instruction
5076   // to movn.
5077
5078   static inline void
5079   update_movnz(unsigned char* view,
5080                AArch64_valtype immed,
5081                bool is_movz)
5082   {
5083     typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
5084     Valtype* wv = reinterpret_cast<Valtype*>(view);
5085     Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
5086
5087     const elfcpp::Elf_Xword doffset =
5088         aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset;
5089     const elfcpp::Elf_Xword dst_mask =
5090         aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask;
5091
5092     // Clear immediate fields and opc code.
5093     val &= ~(dst_mask | (0x3 << 29));
5094
5095     // Set instruction to movz or movn.
5096     // movz: [30:29] is 10   movn: [30:29] is 00
5097     if (is_movz)
5098       val |= (0x2 << 29);
5099
5100     elfcpp::Swap<32, big_endian>::writeval(wv,
5101       static_cast<Valtype>(val | (immed << doffset)));
5102   }
5103
5104   // Update selected bits in text.
5105
5106   template<int valsize>
5107   static inline typename This::Status
5108   reloc_common(unsigned char* view, Address x,
5109                 const AArch64_reloc_property* reloc_property)
5110   {
5111     // Select bits from X.
5112     Address immed = reloc_property->select_x_value(x);
5113
5114     // Update view.
5115     const AArch64_reloc_property::Reloc_inst inst =
5116       reloc_property->reloc_inst();
5117     // If it is a data relocation or instruction has 2 parts of immediate
5118     // fields, you should not call pcrela_general.
5119     gold_assert(aarch64_howto[inst].doffset2 == -1 &&
5120                 aarch64_howto[inst].doffset != -1);
5121     This::template update_view<valsize>(view, immed,
5122                                         aarch64_howto[inst].doffset,
5123                                         aarch64_howto[inst].dst_mask);
5124
5125     // Do check overflow or alignment if needed.
5126     return (reloc_property->checkup_x_value(x)
5127             ? This::STATUS_OKAY
5128             : This::STATUS_OVERFLOW);
5129   }
5130
5131  public:
5132
5133   // Construct a B insn. Note, although we group it here with other relocation
5134   // operation, there is actually no 'relocation' involved here.
5135   static inline void
5136   construct_b(unsigned char* view, unsigned int branch_offset)
5137   {
5138     update_view_two_parts<32>(view, 0x05, (branch_offset >> 2),
5139                               26, 0, 0xffffffff);
5140   }
5141
5142   // Do a simple rela relocation at unaligned addresses.
5143
5144   template<int valsize>
5145   static inline typename This::Status
5146   rela_ua(unsigned char* view,
5147           const Sized_relobj_file<size, big_endian>* object,
5148           const Symbol_value<size>* psymval,
5149           AArch64_valtype addend,
5150           const AArch64_reloc_property* reloc_property)
5151   {
5152     typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
5153       Valtype;
5154     typename elfcpp::Elf_types<size>::Elf_Addr x =
5155         psymval->value(object, addend);
5156     elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
5157       static_cast<Valtype>(x));
5158     return (reloc_property->checkup_x_value(x)
5159             ? This::STATUS_OKAY
5160             : This::STATUS_OVERFLOW);
5161   }
5162
5163   // Do a simple pc-relative relocation at unaligned addresses.
5164
5165   template<int valsize>
5166   static inline typename This::Status
5167   pcrela_ua(unsigned char* view,
5168             const Sized_relobj_file<size, big_endian>* object,
5169             const Symbol_value<size>* psymval,
5170             AArch64_valtype addend,
5171             Address address,
5172             const AArch64_reloc_property* reloc_property)
5173   {
5174     typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
5175       Valtype;
5176     Address x = psymval->value(object, addend) - address;
5177     elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
5178       static_cast<Valtype>(x));
5179     return (reloc_property->checkup_x_value(x)
5180             ? This::STATUS_OKAY
5181             : This::STATUS_OVERFLOW);
5182   }
5183
5184   // Do a simple rela relocation at aligned addresses.
5185
5186   template<int valsize>
5187   static inline typename This::Status
5188   rela(
5189     unsigned char* view,
5190     const Sized_relobj_file<size, big_endian>* object,
5191     const Symbol_value<size>* psymval,
5192     AArch64_valtype addend,
5193     const AArch64_reloc_property* reloc_property)
5194   {
5195     typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5196     Valtype* wv = reinterpret_cast<Valtype*>(view);
5197     Address x = psymval->value(object, addend);
5198     elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x));
5199     return (reloc_property->checkup_x_value(x)
5200             ? This::STATUS_OKAY
5201             : This::STATUS_OVERFLOW);
5202   }
5203
5204   // Do relocate. Update selected bits in text.
5205   // new_val = (val & ~dst_mask) | (immed << doffset)
5206
5207   template<int valsize>
5208   static inline typename This::Status
5209   rela_general(unsigned char* view,
5210                const Sized_relobj_file<size, big_endian>* object,
5211                const Symbol_value<size>* psymval,
5212                AArch64_valtype addend,
5213                const AArch64_reloc_property* reloc_property)
5214   {
5215     // Calculate relocation.
5216     Address x = psymval->value(object, addend);
5217     return This::template reloc_common<valsize>(view, x, reloc_property);
5218   }
5219
5220   // Do relocate. Update selected bits in text.
5221   // new val = (val & ~dst_mask) | (immed << doffset)
5222
5223   template<int valsize>
5224   static inline typename This::Status
5225   rela_general(
5226     unsigned char* view,
5227     AArch64_valtype s,
5228     AArch64_valtype addend,
5229     const AArch64_reloc_property* reloc_property)
5230   {
5231     // Calculate relocation.
5232     Address x = s + addend;
5233     return This::template reloc_common<valsize>(view, x, reloc_property);
5234   }
5235
5236   // Do address relative relocate. Update selected bits in text.
5237   // new val = (val & ~dst_mask) | (immed << doffset)
5238
5239   template<int valsize>
5240   static inline typename This::Status
5241   pcrela_general(
5242     unsigned char* view,
5243     const Sized_relobj_file<size, big_endian>* object,
5244     const Symbol_value<size>* psymval,
5245     AArch64_valtype addend,
5246     Address address,
5247     const AArch64_reloc_property* reloc_property)
5248   {
5249     // Calculate relocation.
5250     Address x = psymval->value(object, addend) - address;
5251     return This::template reloc_common<valsize>(view, x, reloc_property);
5252   }
5253
5254
5255   // Calculate (S + A) - address, update adr instruction.
5256
5257   static inline typename This::Status
5258   adr(unsigned char* view,
5259       const Sized_relobj_file<size, big_endian>* object,
5260       const Symbol_value<size>* psymval,
5261       Address addend,
5262       Address address,
5263       const AArch64_reloc_property* /* reloc_property */)
5264   {
5265     AArch64_valtype x = psymval->value(object, addend) - address;
5266     // Pick bits [20:0] of X.
5267     AArch64_valtype immed = x & 0x1fffff;
5268     update_adr(view, immed);
5269     // Check -2^20 <= X < 2^20
5270     return (size == 64 && Bits<21>::has_overflow((x))
5271             ? This::STATUS_OVERFLOW
5272             : This::STATUS_OKAY);
5273   }
5274
5275   // Calculate PG(S+A) - PG(address), update adrp instruction.
5276   // R_AARCH64_ADR_PREL_PG_HI21
5277
5278   static inline typename This::Status
5279   adrp(
5280     unsigned char* view,
5281     Address sa,
5282     Address address)
5283   {
5284     AArch64_valtype x = This::Page(sa) - This::Page(address);
5285     // Pick [32:12] of X.
5286     AArch64_valtype immed = (x >> 12) & 0x1fffff;
5287     update_adr(view, immed);
5288     // Check -2^32 <= X < 2^32
5289     return (size == 64 && Bits<33>::has_overflow((x))
5290             ? This::STATUS_OVERFLOW
5291             : This::STATUS_OKAY);
5292   }
5293
5294   // Calculate PG(S+A) - PG(address), update adrp instruction.
5295   // R_AARCH64_ADR_PREL_PG_HI21
5296
5297   static inline typename This::Status
5298   adrp(unsigned char* view,
5299        const Sized_relobj_file<size, big_endian>* object,
5300        const Symbol_value<size>* psymval,
5301        Address addend,
5302        Address address,
5303        const AArch64_reloc_property* reloc_property)
5304   {
5305     Address sa = psymval->value(object, addend);
5306     AArch64_valtype x = This::Page(sa) - This::Page(address);
5307     // Pick [32:12] of X.
5308     AArch64_valtype immed = (x >> 12) & 0x1fffff;
5309     update_adr(view, immed);
5310     return (reloc_property->checkup_x_value(x)
5311             ? This::STATUS_OKAY
5312             : This::STATUS_OVERFLOW);
5313   }
5314
5315   // Update mov[n/z] instruction. Check overflow if needed.
5316   // If X >=0, set the instruction to movz and its immediate value to the
5317   // selected bits S.
5318   // If X < 0, set the instruction to movn and its immediate value to
5319   // NOT (selected bits of).
5320
5321   static inline typename This::Status
5322   movnz(unsigned char* view,
5323         AArch64_valtype x,
5324         const AArch64_reloc_property* reloc_property)
5325   {
5326     // Select bits from X.
5327     Address immed;
5328     bool is_movz;
5329     typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW;
5330     if (static_cast<SignedW>(x) >= 0)
5331       {
5332         immed = reloc_property->select_x_value(x);
5333         is_movz = true;
5334       }
5335     else
5336       {
5337         immed = reloc_property->select_x_value(~x);;
5338         is_movz = false;
5339       }
5340
5341     // Update movnz instruction.
5342     update_movnz(view, immed, is_movz);
5343
5344     // Do check overflow or alignment if needed.
5345     return (reloc_property->checkup_x_value(x)
5346             ? This::STATUS_OKAY
5347             : This::STATUS_OVERFLOW);
5348   }
5349
5350   static inline bool
5351   maybe_apply_stub(unsigned int,
5352                    const The_relocate_info*,
5353                    const The_rela&,
5354                    unsigned char*,
5355                    Address,
5356                    const Sized_symbol<size>*,
5357                    const Symbol_value<size>*,
5358                    const Sized_relobj_file<size, big_endian>*,
5359                    section_size_type);
5360
5361 };  // End of AArch64_relocate_functions
5362
5363
5364 // For a certain relocation type (usually jump/branch), test to see if the
5365 // destination needs a stub to fulfil. If so, re-route the destination of the
5366 // original instruction to the stub, note, at this time, the stub has already
5367 // been generated.
5368
5369 template<int size, bool big_endian>
5370 bool
5371 AArch64_relocate_functions<size, big_endian>::
5372 maybe_apply_stub(unsigned int r_type,
5373                  const The_relocate_info* relinfo,
5374                  const The_rela& rela,
5375                  unsigned char* view,
5376                  Address address,
5377                  const Sized_symbol<size>* gsym,
5378                  const Symbol_value<size>* psymval,
5379                  const Sized_relobj_file<size, big_endian>* object,
5380                  section_size_type current_group_size)
5381 {
5382   if (parameters->options().relocatable())
5383     return false;
5384
5385   typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend();
5386   Address branch_target = psymval->value(object, 0) + addend;
5387   int stub_type =
5388     The_reloc_stub::stub_type_for_reloc(r_type, address, branch_target);
5389   if (stub_type == ST_NONE)
5390     return false;
5391
5392   const The_aarch64_relobj* aarch64_relobj =
5393       static_cast<const The_aarch64_relobj*>(object);
5394   The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
5395   gold_assert(stub_table != NULL);
5396
5397   unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5398   typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
5399   The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key);
5400   gold_assert(stub != NULL);
5401
5402   Address new_branch_target = stub_table->address() + stub->offset();
5403   typename elfcpp::Swap<size, big_endian>::Valtype branch_offset =
5404       new_branch_target - address;
5405   const AArch64_reloc_property* arp =
5406       aarch64_reloc_property_table->get_reloc_property(r_type);
5407   gold_assert(arp != NULL);
5408   typename This::Status status = This::template
5409       rela_general<32>(view, branch_offset, 0, arp);
5410   if (status != This::STATUS_OKAY)
5411     gold_error(_("Stub is too far away, try a smaller value "
5412                  "for '--stub-group-size'. The current value is 0x%lx."),
5413                static_cast<unsigned long>(current_group_size));
5414   return true;
5415 }
5416
5417
5418 // Group input sections for stub generation.
5419 //
5420 // We group input sections in an output section so that the total size,
5421 // including any padding space due to alignment is smaller than GROUP_SIZE
5422 // unless the only input section in group is bigger than GROUP_SIZE already.
5423 // Then an ARM stub table is created to follow the last input section
5424 // in group.  For each group an ARM stub table is created an is placed
5425 // after the last group.  If STUB_ALWAYS_AFTER_BRANCH is false, we further
5426 // extend the group after the stub table.
5427
5428 template<int size, bool big_endian>
5429 void
5430 Target_aarch64<size, big_endian>::group_sections(
5431     Layout* layout,
5432     section_size_type group_size,
5433     bool stubs_always_after_branch,
5434     const Task* task)
5435 {
5436   // Group input sections and insert stub table
5437   Layout::Section_list section_list;
5438   layout->get_executable_sections(&section_list);
5439   for (Layout::Section_list::const_iterator p = section_list.begin();
5440        p != section_list.end();
5441        ++p)
5442     {
5443       AArch64_output_section<size, big_endian>* output_section =
5444           static_cast<AArch64_output_section<size, big_endian>*>(*p);
5445       output_section->group_sections(group_size, stubs_always_after_branch,
5446                                      this, task);
5447     }
5448 }
5449
5450
5451 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5452 // section of RELOBJ.
5453
5454 template<int size, bool big_endian>
5455 AArch64_input_section<size, big_endian>*
5456 Target_aarch64<size, big_endian>::find_aarch64_input_section(
5457     Relobj* relobj, unsigned int shndx) const
5458 {
5459   Section_id sid(relobj, shndx);
5460   typename AArch64_input_section_map::const_iterator p =
5461     this->aarch64_input_section_map_.find(sid);
5462   return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL;
5463 }
5464
5465
5466 // Make a new AArch64_input_section object.
5467
5468 template<int size, bool big_endian>
5469 AArch64_input_section<size, big_endian>*
5470 Target_aarch64<size, big_endian>::new_aarch64_input_section(
5471     Relobj* relobj, unsigned int shndx)
5472 {
5473   Section_id sid(relobj, shndx);
5474
5475   AArch64_input_section<size, big_endian>* input_section =
5476       new AArch64_input_section<size, big_endian>(relobj, shndx);
5477   input_section->init();
5478
5479   // Register new AArch64_input_section in map for look-up.
5480   std::pair<typename AArch64_input_section_map::iterator,bool> ins =
5481       this->aarch64_input_section_map_.insert(
5482           std::make_pair(sid, input_section));
5483
5484   // Make sure that it we have not created another AArch64_input_section
5485   // for this input section already.
5486   gold_assert(ins.second);
5487
5488   return input_section;
5489 }
5490
5491
5492 // Relaxation hook.  This is where we do stub generation.
5493
5494 template<int size, bool big_endian>
5495 bool
5496 Target_aarch64<size, big_endian>::do_relax(
5497     int pass,
5498     const Input_objects* input_objects,
5499     Symbol_table* symtab,
5500     Layout* layout ,
5501     const Task* task)
5502 {
5503   gold_assert(!parameters->options().relocatable());
5504   if (pass == 1)
5505     {
5506       // We don't handle negative stub_group_size right now.
5507       this->stub_group_size_ = abs(parameters->options().stub_group_size());
5508       if (this->stub_group_size_ == 1)
5509         {
5510           // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5511           // will fail to link.  The user will have to relink with an explicit
5512           // group size option.
5513           this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET -
5514                                    4096 * 4;
5515         }
5516       group_sections(layout, this->stub_group_size_, true, task);
5517     }
5518   else
5519     {
5520       // If this is not the first pass, addresses and file offsets have
5521       // been reset at this point, set them here.
5522       for (Stub_table_iterator sp = this->stub_tables_.begin();
5523            sp != this->stub_tables_.end(); ++sp)
5524         {
5525           The_stub_table* stt = *sp;
5526           The_aarch64_input_section* owner = stt->owner();
5527           off_t off = align_address(owner->original_size(),
5528                                     stt->addralign());
5529           stt->set_address_and_file_offset(owner->address() + off,
5530                                            owner->offset() + off);
5531         }
5532     }
5533
5534   // Scan relocs for relocation stubs
5535   for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
5536        op != input_objects->relobj_end();
5537        ++op)
5538     {
5539       The_aarch64_relobj* aarch64_relobj =
5540           static_cast<The_aarch64_relobj*>(*op);
5541       // Lock the object so we can read from it.  This is only called
5542       // single-threaded from Layout::finalize, so it is OK to lock.
5543       Task_lock_obj<Object> tl(task, aarch64_relobj);
5544       aarch64_relobj->scan_sections_for_stubs(this, symtab, layout);
5545     }
5546
5547   bool any_stub_table_changed = false;
5548   for (Stub_table_iterator siter = this->stub_tables_.begin();
5549        siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter)
5550     {
5551       The_stub_table* stub_table = *siter;
5552       if (stub_table->update_data_size_changed_p())
5553         {
5554           The_aarch64_input_section* owner = stub_table->owner();
5555           uint64_t address = owner->address();
5556           off_t offset = owner->offset();
5557           owner->reset_address_and_file_offset();
5558           owner->set_address_and_file_offset(address, offset);
5559
5560           any_stub_table_changed = true;
5561         }
5562     }
5563
5564   // Do not continue relaxation.
5565   bool continue_relaxation = any_stub_table_changed;
5566   if (!continue_relaxation)
5567     for (Stub_table_iterator sp = this->stub_tables_.begin();
5568          (sp != this->stub_tables_.end());
5569          ++sp)
5570       (*sp)->finalize_stubs();
5571
5572   return continue_relaxation;
5573 }
5574
5575
5576 // Make a new Stub_table.
5577
5578 template<int size, bool big_endian>
5579 Stub_table<size, big_endian>*
5580 Target_aarch64<size, big_endian>::new_stub_table(
5581     AArch64_input_section<size, big_endian>* owner)
5582 {
5583   Stub_table<size, big_endian>* stub_table =
5584       new Stub_table<size, big_endian>(owner);
5585   stub_table->set_address(align_address(
5586       owner->address() + owner->data_size(), 8));
5587   stub_table->set_file_offset(owner->offset() + owner->data_size());
5588   stub_table->finalize_data_size();
5589
5590   this->stub_tables_.push_back(stub_table);
5591
5592   return stub_table;
5593 }
5594
5595
5596 template<int size, bool big_endian>
5597 uint64_t
5598 Target_aarch64<size, big_endian>::do_reloc_addend(
5599     void* arg, unsigned int r_type, uint64_t) const
5600 {
5601   gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC);
5602   uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
5603   gold_assert(intarg < this->tlsdesc_reloc_info_.size());
5604   const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
5605   const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
5606   gold_assert(psymval->is_tls_symbol());
5607   // The value of a TLS symbol is the offset in the TLS segment.
5608   return psymval->value(ti.object, 0);
5609 }
5610
5611 // Return the number of entries in the PLT.
5612
5613 template<int size, bool big_endian>
5614 unsigned int
5615 Target_aarch64<size, big_endian>::plt_entry_count() const
5616 {
5617   if (this->plt_ == NULL)
5618     return 0;
5619   return this->plt_->entry_count();
5620 }
5621
5622 // Return the offset of the first non-reserved PLT entry.
5623
5624 template<int size, bool big_endian>
5625 unsigned int
5626 Target_aarch64<size, big_endian>::first_plt_entry_offset() const
5627 {
5628   return this->plt_->first_plt_entry_offset();
5629 }
5630
5631 // Return the size of each PLT entry.
5632
5633 template<int size, bool big_endian>
5634 unsigned int
5635 Target_aarch64<size, big_endian>::plt_entry_size() const
5636 {
5637   return this->plt_->get_plt_entry_size();
5638 }
5639
5640 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5641
5642 template<int size, bool big_endian>
5643 void
5644 Target_aarch64<size, big_endian>::define_tls_base_symbol(
5645     Symbol_table* symtab, Layout* layout)
5646 {
5647   if (this->tls_base_symbol_defined_)
5648     return;
5649
5650   Output_segment* tls_segment = layout->tls_segment();
5651   if (tls_segment != NULL)
5652     {
5653       // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5654       symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
5655                                        Symbol_table::PREDEFINED,
5656                                        tls_segment, 0, 0,
5657                                        elfcpp::STT_TLS,
5658                                        elfcpp::STB_LOCAL,
5659                                        elfcpp::STV_HIDDEN, 0,
5660                                        Symbol::SEGMENT_START,
5661                                        true);
5662     }
5663   this->tls_base_symbol_defined_ = true;
5664 }
5665
5666 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5667
5668 template<int size, bool big_endian>
5669 void
5670 Target_aarch64<size, big_endian>::reserve_tlsdesc_entries(
5671     Symbol_table* symtab, Layout* layout)
5672 {
5673   if (this->plt_ == NULL)
5674     this->make_plt_section(symtab, layout);
5675
5676   if (!this->plt_->has_tlsdesc_entry())
5677     {
5678       // Allocate the TLSDESC_GOT entry.
5679       Output_data_got_aarch64<size, big_endian>* got =
5680           this->got_section(symtab, layout);
5681       unsigned int got_offset = got->add_constant(0);
5682
5683       // Allocate the TLSDESC_PLT entry.
5684       this->plt_->reserve_tlsdesc_entry(got_offset);
5685     }
5686 }
5687
5688 // Create a GOT entry for the TLS module index.
5689
5690 template<int size, bool big_endian>
5691 unsigned int
5692 Target_aarch64<size, big_endian>::got_mod_index_entry(
5693     Symbol_table* symtab, Layout* layout,
5694     Sized_relobj_file<size, big_endian>* object)
5695 {
5696   if (this->got_mod_index_offset_ == -1U)
5697     {
5698       gold_assert(symtab != NULL && layout != NULL && object != NULL);
5699       Reloc_section* rela_dyn = this->rela_dyn_section(layout);
5700       Output_data_got_aarch64<size, big_endian>* got =
5701           this->got_section(symtab, layout);
5702       unsigned int got_offset = got->add_constant(0);
5703       rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got,
5704                           got_offset, 0);
5705       got->add_constant(0);
5706       this->got_mod_index_offset_ = got_offset;
5707     }
5708   return this->got_mod_index_offset_;
5709 }
5710
5711 // Optimize the TLS relocation type based on what we know about the
5712 // symbol.  IS_FINAL is true if the final address of this symbol is
5713 // known at link time.
5714
5715 template<int size, bool big_endian>
5716 tls::Tls_optimization
5717 Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final,
5718                                                      int r_type)
5719 {
5720   // If we are generating a shared library, then we can't do anything
5721   // in the linker
5722   if (parameters->options().shared())
5723     return tls::TLSOPT_NONE;
5724
5725   switch (r_type)
5726     {
5727     case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
5728     case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
5729     case elfcpp::R_AARCH64_TLSDESC_LD_PREL19:
5730     case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21:
5731     case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
5732     case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
5733     case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
5734     case elfcpp::R_AARCH64_TLSDESC_OFF_G1:
5735     case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC:
5736     case elfcpp::R_AARCH64_TLSDESC_LDR:
5737     case elfcpp::R_AARCH64_TLSDESC_ADD:
5738     case elfcpp::R_AARCH64_TLSDESC_CALL:
5739       // These are General-Dynamic which permits fully general TLS
5740       // access.  Since we know that we are generating an executable,
5741       // we can convert this to Initial-Exec.  If we also know that
5742       // this is a local symbol, we can further switch to Local-Exec.
5743       if (is_final)
5744         return tls::TLSOPT_TO_LE;
5745       return tls::TLSOPT_TO_IE;
5746
5747     case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
5748     case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
5749     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
5750     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
5751     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
5752     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
5753       // These are Local-Dynamic, which refer to local symbols in the
5754       // dynamic TLS block. Since we know that we generating an
5755       // executable, we can switch to Local-Exec.
5756       return tls::TLSOPT_TO_LE;
5757
5758     case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
5759     case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
5760     case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
5761     case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
5762     case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
5763       // These are Initial-Exec relocs which get the thread offset
5764       // from the GOT. If we know that we are linking against the
5765       // local symbol, we can switch to Local-Exec, which links the
5766       // thread offset into the instruction.
5767       if (is_final)
5768         return tls::TLSOPT_TO_LE;
5769       return tls::TLSOPT_NONE;
5770
5771     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
5772     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
5773     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
5774     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
5775     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
5776     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
5777     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
5778     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
5779       // When we already have Local-Exec, there is nothing further we
5780       // can do.
5781       return tls::TLSOPT_NONE;
5782
5783     default:
5784       gold_unreachable();
5785     }
5786 }
5787
5788 // Returns true if this relocation type could be that of a function pointer.
5789
5790 template<int size, bool big_endian>
5791 inline bool
5792 Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc(
5793   unsigned int r_type)
5794 {
5795   switch (r_type)
5796     {
5797     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
5798     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
5799     case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
5800     case elfcpp::R_AARCH64_ADR_GOT_PAGE:
5801     case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
5802       {
5803         return true;
5804       }
5805     }
5806   return false;
5807 }
5808
5809 // For safe ICF, scan a relocation for a local symbol to check if it
5810 // corresponds to a function pointer being taken.  In that case mark
5811 // the function whose pointer was taken as not foldable.
5812
5813 template<int size, bool big_endian>
5814 inline bool
5815 Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer(
5816   Symbol_table* ,
5817   Layout* ,
5818   Target_aarch64<size, big_endian>* ,
5819   Sized_relobj_file<size, big_endian>* ,
5820   unsigned int ,
5821   Output_section* ,
5822   const elfcpp::Rela<size, big_endian>& ,
5823   unsigned int r_type,
5824   const elfcpp::Sym<size, big_endian>&)
5825 {
5826   // When building a shared library, do not fold any local symbols.
5827   return (parameters->options().shared()
5828           || possible_function_pointer_reloc(r_type));
5829 }
5830
5831 // For safe ICF, scan a relocation for a global symbol to check if it
5832 // corresponds to a function pointer being taken.  In that case mark
5833 // the function whose pointer was taken as not foldable.
5834
5835 template<int size, bool big_endian>
5836 inline bool
5837 Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer(
5838   Symbol_table* ,
5839   Layout* ,
5840   Target_aarch64<size, big_endian>* ,
5841   Sized_relobj_file<size, big_endian>* ,
5842   unsigned int ,
5843   Output_section* ,
5844   const elfcpp::Rela<size, big_endian>& ,
5845   unsigned int r_type,
5846   Symbol* gsym)
5847 {
5848   // When building a shared library, do not fold symbols whose visibility
5849   // is hidden, internal or protected.
5850   return ((parameters->options().shared()
5851            && (gsym->visibility() == elfcpp::STV_INTERNAL
5852                || gsym->visibility() == elfcpp::STV_PROTECTED
5853                || gsym->visibility() == elfcpp::STV_HIDDEN))
5854           || possible_function_pointer_reloc(r_type));
5855 }
5856
5857 // Report an unsupported relocation against a local symbol.
5858
5859 template<int size, bool big_endian>
5860 void
5861 Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local(
5862      Sized_relobj_file<size, big_endian>* object,
5863      unsigned int r_type)
5864 {
5865   gold_error(_("%s: unsupported reloc %u against local symbol"),
5866              object->name().c_str(), r_type);
5867 }
5868
5869 // We are about to emit a dynamic relocation of type R_TYPE.  If the
5870 // dynamic linker does not support it, issue an error.
5871
5872 template<int size, bool big_endian>
5873 void
5874 Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object,
5875                                                       unsigned int r_type)
5876 {
5877   gold_assert(r_type != elfcpp::R_AARCH64_NONE);
5878
5879   switch (r_type)
5880     {
5881     // These are the relocation types supported by glibc for AARCH64.
5882     case elfcpp::R_AARCH64_NONE:
5883     case elfcpp::R_AARCH64_COPY:
5884     case elfcpp::R_AARCH64_GLOB_DAT:
5885     case elfcpp::R_AARCH64_JUMP_SLOT:
5886     case elfcpp::R_AARCH64_RELATIVE:
5887     case elfcpp::R_AARCH64_TLS_DTPREL64:
5888     case elfcpp::R_AARCH64_TLS_DTPMOD64:
5889     case elfcpp::R_AARCH64_TLS_TPREL64:
5890     case elfcpp::R_AARCH64_TLSDESC:
5891     case elfcpp::R_AARCH64_IRELATIVE:
5892     case elfcpp::R_AARCH64_ABS32:
5893     case elfcpp::R_AARCH64_ABS64:
5894       return;
5895
5896     default:
5897       break;
5898     }
5899
5900   // This prevents us from issuing more than one error per reloc
5901   // section. But we can still wind up issuing more than one
5902   // error per object file.
5903   if (this->issued_non_pic_error_)
5904     return;
5905   gold_assert(parameters->options().output_is_position_independent());
5906   object->error(_("requires unsupported dynamic reloc; "
5907                   "recompile with -fPIC"));
5908   this->issued_non_pic_error_ = true;
5909   return;
5910 }
5911
5912 // Return whether we need to make a PLT entry for a relocation of the
5913 // given type against a STT_GNU_IFUNC symbol.
5914
5915 template<int size, bool big_endian>
5916 bool
5917 Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc(
5918     Sized_relobj_file<size, big_endian>* object,
5919     unsigned int r_type)
5920 {
5921   const AArch64_reloc_property* arp =
5922       aarch64_reloc_property_table->get_reloc_property(r_type);
5923   gold_assert(arp != NULL);
5924
5925   int flags = arp->reference_flags();
5926   if (flags & Symbol::TLS_REF)
5927     {
5928       gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
5929                  object->name().c_str(), arp->name().c_str());
5930       return false;
5931     }
5932   return flags != 0;
5933 }
5934
5935 // Scan a relocation for a local symbol.
5936
5937 template<int size, bool big_endian>
5938 inline void
5939 Target_aarch64<size, big_endian>::Scan::local(
5940     Symbol_table* symtab,
5941     Layout* layout,
5942     Target_aarch64<size, big_endian>* target,
5943     Sized_relobj_file<size, big_endian>* object,
5944     unsigned int data_shndx,
5945     Output_section* output_section,
5946     const elfcpp::Rela<size, big_endian>& rela,
5947     unsigned int r_type,
5948     const elfcpp::Sym<size, big_endian>& lsym,
5949     bool is_discarded)
5950 {
5951   if (is_discarded)
5952     return;
5953
5954   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
5955       Reloc_section;
5956   Output_data_got_aarch64<size, big_endian>* got =
5957       target->got_section(symtab, layout);
5958   unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5959
5960   // A local STT_GNU_IFUNC symbol may require a PLT entry.
5961   bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
5962   if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
5963     target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
5964
5965   switch (r_type)
5966     {
5967     case elfcpp::R_AARCH64_ABS32:
5968     case elfcpp::R_AARCH64_ABS16:
5969       if (parameters->options().output_is_position_independent())
5970         {
5971           gold_error(_("%s: unsupported reloc %u in pos independent link."),
5972                      object->name().c_str(), r_type);
5973         }
5974       break;
5975
5976     case elfcpp::R_AARCH64_ABS64:
5977       // If building a shared library or pie, we need to mark this as a dynmic
5978       // reloction, so that the dynamic loader can relocate it.
5979       if (parameters->options().output_is_position_independent())
5980         {
5981           Reloc_section* rela_dyn = target->rela_dyn_section(layout);
5982           rela_dyn->add_local_relative(object, r_sym,
5983                                        elfcpp::R_AARCH64_RELATIVE,
5984                                        output_section,
5985                                        data_shndx,
5986                                        rela.get_r_offset(),
5987                                        rela.get_r_addend(),
5988                                        is_ifunc);
5989         }
5990       break;
5991
5992     case elfcpp::R_AARCH64_PREL64:
5993     case elfcpp::R_AARCH64_PREL32:
5994     case elfcpp::R_AARCH64_PREL16:
5995       break;
5996
5997     case elfcpp::R_AARCH64_ADR_GOT_PAGE:
5998     case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
5999       // This pair of relocations is used to access a specific GOT entry.
6000       {
6001         bool is_new = false;
6002         // This symbol requires a GOT entry.
6003         if (is_ifunc)
6004           is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
6005         else
6006           is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
6007         if (is_new && parameters->options().output_is_position_independent())
6008           target->rela_dyn_section(layout)->
6009             add_local_relative(object,
6010                                r_sym,
6011                                elfcpp::R_AARCH64_RELATIVE,
6012                                got,
6013                                object->local_got_offset(r_sym,
6014                                                         GOT_TYPE_STANDARD),
6015                                0,
6016                                false);
6017       }
6018       break;
6019
6020     case elfcpp::R_AARCH64_LD_PREL_LO19:        // 273
6021     case elfcpp::R_AARCH64_ADR_PREL_LO21:       // 274
6022     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:    // 275
6023     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
6024     case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:     // 277
6025     case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC:   // 278
6026     case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC:  // 284
6027     case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC:  // 285
6028     case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC:  // 286
6029     case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
6030        break;
6031
6032     // Control flow, pc-relative. We don't need to do anything for a relative
6033     // addressing relocation against a local symbol if it does not reference
6034     // the GOT.
6035     case elfcpp::R_AARCH64_TSTBR14:
6036     case elfcpp::R_AARCH64_CONDBR19:
6037     case elfcpp::R_AARCH64_JUMP26:
6038     case elfcpp::R_AARCH64_CALL26:
6039       break;
6040
6041     case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
6042     case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
6043       {
6044         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6045           optimize_tls_reloc(!parameters->options().shared(), r_type);
6046         if (tlsopt == tls::TLSOPT_TO_LE)
6047           break;
6048
6049         layout->set_has_static_tls();
6050         // Create a GOT entry for the tp-relative offset.
6051         if (!parameters->doing_static_link())
6052           {
6053             got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
6054                                     target->rela_dyn_section(layout),
6055                                     elfcpp::R_AARCH64_TLS_TPREL64);
6056           }
6057         else if (!object->local_has_got_offset(r_sym,
6058                                                GOT_TYPE_TLS_OFFSET))
6059           {
6060             got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET);
6061             unsigned int got_offset =
6062                 object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
6063             const elfcpp::Elf_Xword addend = rela.get_r_addend();
6064             gold_assert(addend == 0);
6065             got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64,
6066                                   object, r_sym);
6067           }
6068       }
6069       break;
6070
6071     case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
6072     case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
6073       {
6074         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6075             optimize_tls_reloc(!parameters->options().shared(), r_type);
6076         if (tlsopt == tls::TLSOPT_TO_LE)
6077           {
6078             layout->set_has_static_tls();
6079             break;
6080           }
6081         gold_assert(tlsopt == tls::TLSOPT_NONE);
6082
6083         got->add_local_pair_with_rel(object,r_sym, data_shndx,
6084                                      GOT_TYPE_TLS_PAIR,
6085                                      target->rela_dyn_section(layout),
6086                                      elfcpp::R_AARCH64_TLS_DTPMOD64);
6087       }
6088       break;
6089
6090     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
6091     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
6092     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
6093     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
6094     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
6095     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
6096     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
6097     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
6098       {
6099         layout->set_has_static_tls();
6100         bool output_is_shared = parameters->options().shared();
6101         if (output_is_shared)
6102           gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6103                      object->name().c_str(), r_type);
6104       }
6105       break;
6106
6107     case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
6108     case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
6109       {
6110         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6111             optimize_tls_reloc(!parameters->options().shared(), r_type);
6112         if (tlsopt == tls::TLSOPT_NONE)
6113           {
6114             // Create a GOT entry for the module index.
6115             target->got_mod_index_entry(symtab, layout, object);
6116           }
6117         else if (tlsopt != tls::TLSOPT_TO_LE)
6118           unsupported_reloc_local(object, r_type);
6119       }
6120       break;
6121
6122     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
6123     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
6124     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
6125     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
6126       break;
6127
6128     case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
6129     case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
6130     case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
6131       {
6132         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6133             optimize_tls_reloc(!parameters->options().shared(), r_type);
6134         target->define_tls_base_symbol(symtab, layout);
6135         if (tlsopt == tls::TLSOPT_NONE)
6136           {
6137             // Create reserved PLT and GOT entries for the resolver.
6138             target->reserve_tlsdesc_entries(symtab, layout);
6139
6140             // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6141             // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6142             // entry needs to be in an area in .got.plt, not .got. Call
6143             // got_section to make sure the section has been created.
6144             target->got_section(symtab, layout);
6145             Output_data_got<size, big_endian>* got =
6146                 target->got_tlsdesc_section();
6147             unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6148             if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
6149               {
6150                 unsigned int got_offset = got->add_constant(0);
6151                 got->add_constant(0);
6152                 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
6153                                              got_offset);
6154                 Reloc_section* rt = target->rela_tlsdesc_section(layout);
6155                 // We store the arguments we need in a vector, and use
6156                 // the index into the vector as the parameter to pass
6157                 // to the target specific routines.
6158                 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
6159                 void* arg = reinterpret_cast<void*>(intarg);
6160                 rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg,
6161                                         got, got_offset, 0);
6162               }
6163           }
6164         else if (tlsopt != tls::TLSOPT_TO_LE)
6165           unsupported_reloc_local(object, r_type);
6166       }
6167       break;
6168
6169     case elfcpp::R_AARCH64_TLSDESC_CALL:
6170       break;
6171
6172     default:
6173       unsupported_reloc_local(object, r_type);
6174     }
6175 }
6176
6177
6178 // Report an unsupported relocation against a global symbol.
6179
6180 template<int size, bool big_endian>
6181 void
6182 Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global(
6183     Sized_relobj_file<size, big_endian>* object,
6184     unsigned int r_type,
6185     Symbol* gsym)
6186 {
6187   gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6188              object->name().c_str(), r_type, gsym->demangled_name().c_str());
6189 }
6190
6191 template<int size, bool big_endian>
6192 inline void
6193 Target_aarch64<size, big_endian>::Scan::global(
6194     Symbol_table* symtab,
6195     Layout* layout,
6196     Target_aarch64<size, big_endian>* target,
6197     Sized_relobj_file<size, big_endian> * object,
6198     unsigned int data_shndx,
6199     Output_section* output_section,
6200     const elfcpp::Rela<size, big_endian>& rela,
6201     unsigned int r_type,
6202     Symbol* gsym)
6203 {
6204   // A STT_GNU_IFUNC symbol may require a PLT entry.
6205   if (gsym->type() == elfcpp::STT_GNU_IFUNC
6206       && this->reloc_needs_plt_for_ifunc(object, r_type))
6207     target->make_plt_entry(symtab, layout, gsym);
6208
6209   typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
6210     Reloc_section;
6211   const AArch64_reloc_property* arp =
6212       aarch64_reloc_property_table->get_reloc_property(r_type);
6213   gold_assert(arp != NULL);
6214
6215   switch (r_type)
6216     {
6217     case elfcpp::R_AARCH64_ABS16:
6218     case elfcpp::R_AARCH64_ABS32:
6219     case elfcpp::R_AARCH64_ABS64:
6220       {
6221         // Make a PLT entry if necessary.
6222         if (gsym->needs_plt_entry())
6223           {
6224             target->make_plt_entry(symtab, layout, gsym);
6225             // Since this is not a PC-relative relocation, we may be
6226             // taking the address of a function. In that case we need to
6227             // set the entry in the dynamic symbol table to the address of
6228             // the PLT entry.
6229             if (gsym->is_from_dynobj() && !parameters->options().shared())
6230               gsym->set_needs_dynsym_value();
6231           }
6232         // Make a dynamic relocation if necessary.
6233         if (gsym->needs_dynamic_reloc(arp->reference_flags()))
6234           {
6235             if (!parameters->options().output_is_position_independent()
6236                 && gsym->may_need_copy_reloc())
6237               {
6238                 target->copy_reloc(symtab, layout, object,
6239                                    data_shndx, output_section, gsym, rela);
6240               }
6241             else if (r_type == elfcpp::R_AARCH64_ABS64
6242                      && gsym->type() == elfcpp::STT_GNU_IFUNC
6243                      && gsym->can_use_relative_reloc(false)
6244                      && !gsym->is_from_dynobj()
6245                      && !gsym->is_undefined()
6246                      && !gsym->is_preemptible())
6247               {
6248                 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6249                 // symbol. This makes a function address in a PIE executable
6250                 // match the address in a shared library that it links against.
6251                 Reloc_section* rela_dyn =
6252                     target->rela_irelative_section(layout);
6253                 unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE;
6254                 rela_dyn->add_symbolless_global_addend(gsym, r_type,
6255                                                        output_section, object,
6256                                                        data_shndx,
6257                                                        rela.get_r_offset(),
6258                                                        rela.get_r_addend());
6259               }
6260             else if (r_type == elfcpp::R_AARCH64_ABS64
6261                      && gsym->can_use_relative_reloc(false))
6262               {
6263                 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
6264                 rela_dyn->add_global_relative(gsym,
6265                                               elfcpp::R_AARCH64_RELATIVE,
6266                                               output_section,
6267                                               object,
6268                                               data_shndx,
6269                                               rela.get_r_offset(),
6270                                               rela.get_r_addend(),
6271                                               false);
6272               }
6273             else
6274               {
6275                 check_non_pic(object, r_type);
6276                 Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*
6277                     rela_dyn = target->rela_dyn_section(layout);
6278                 rela_dyn->add_global(
6279                   gsym, r_type, output_section, object,
6280                   data_shndx, rela.get_r_offset(),rela.get_r_addend());
6281               }
6282           }
6283       }
6284       break;
6285
6286     case elfcpp::R_AARCH64_PREL16:
6287     case elfcpp::R_AARCH64_PREL32:
6288     case elfcpp::R_AARCH64_PREL64:
6289       // This is used to fill the GOT absolute address.
6290       if (gsym->needs_plt_entry())
6291         {
6292           target->make_plt_entry(symtab, layout, gsym);
6293         }
6294       break;
6295
6296     case elfcpp::R_AARCH64_LD_PREL_LO19:        // 273
6297     case elfcpp::R_AARCH64_ADR_PREL_LO21:       // 274
6298     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:    // 275
6299     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
6300     case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:     // 277
6301     case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC:   // 278
6302     case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC:  // 284
6303     case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC:  // 285
6304     case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC:  // 286
6305     case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
6306       {
6307         if (gsym->needs_plt_entry())
6308           target->make_plt_entry(symtab, layout, gsym);
6309         // Make a dynamic relocation if necessary.
6310         if (gsym->needs_dynamic_reloc(arp->reference_flags()))
6311           {
6312             if (parameters->options().output_is_executable()
6313                 && gsym->may_need_copy_reloc())
6314               {
6315                 target->copy_reloc(symtab, layout, object,
6316                                    data_shndx, output_section, gsym, rela);
6317               }
6318           }
6319         break;
6320       }
6321
6322     case elfcpp::R_AARCH64_ADR_GOT_PAGE:
6323     case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
6324       {
6325         // This pair of relocations is used to access a specific GOT entry.
6326         // Note a GOT entry is an *address* to a symbol.
6327         // The symbol requires a GOT entry
6328         Output_data_got_aarch64<size, big_endian>* got =
6329           target->got_section(symtab, layout);
6330         if (gsym->final_value_is_known())
6331           {
6332             // For a STT_GNU_IFUNC symbol we want the PLT address.
6333             if (gsym->type() == elfcpp::STT_GNU_IFUNC)
6334               got->add_global_plt(gsym, GOT_TYPE_STANDARD);
6335             else
6336               got->add_global(gsym, GOT_TYPE_STANDARD);
6337           }
6338         else
6339           {
6340             // If this symbol is not fully resolved, we need to add a dynamic
6341             // relocation for it.
6342             Reloc_section* rela_dyn = target->rela_dyn_section(layout);
6343
6344             // Use a GLOB_DAT rather than a RELATIVE reloc if:
6345             //
6346             // 1) The symbol may be defined in some other module.
6347             // 2) We are building a shared library and this is a protected
6348             // symbol; using GLOB_DAT means that the dynamic linker can use
6349             // the address of the PLT in the main executable when appropriate
6350             // so that function address comparisons work.
6351             // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6352             // again so that function address comparisons work.
6353             if (gsym->is_from_dynobj()
6354                 || gsym->is_undefined()
6355                 || gsym->is_preemptible()
6356                 || (gsym->visibility() == elfcpp::STV_PROTECTED
6357                     && parameters->options().shared())
6358                 || (gsym->type() == elfcpp::STT_GNU_IFUNC
6359                     && parameters->options().output_is_position_independent()))
6360               got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
6361                                        rela_dyn, elfcpp::R_AARCH64_GLOB_DAT);
6362             else
6363               {
6364                 // For a STT_GNU_IFUNC symbol we want to write the PLT
6365                 // offset into the GOT, so that function pointer
6366                 // comparisons work correctly.
6367                 bool is_new;
6368                 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
6369                   is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
6370                 else
6371                   {
6372                     is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
6373                     // Tell the dynamic linker to use the PLT address
6374                     // when resolving relocations.
6375                     if (gsym->is_from_dynobj()
6376                         && !parameters->options().shared())
6377                       gsym->set_needs_dynsym_value();
6378                   }
6379                 if (is_new)
6380                   {
6381                     rela_dyn->add_global_relative(
6382                         gsym, elfcpp::R_AARCH64_RELATIVE,
6383                         got,
6384                         gsym->got_offset(GOT_TYPE_STANDARD),
6385                         0,
6386                         false);
6387                   }
6388               }
6389           }
6390         break;
6391       }
6392
6393     case elfcpp::R_AARCH64_TSTBR14:
6394     case elfcpp::R_AARCH64_CONDBR19:
6395     case elfcpp::R_AARCH64_JUMP26:
6396     case elfcpp::R_AARCH64_CALL26:
6397       {
6398         if (gsym->final_value_is_known())
6399           break;
6400
6401         if (gsym->is_defined() &&
6402             !gsym->is_from_dynobj() &&
6403             !gsym->is_preemptible())
6404           break;
6405
6406         // Make plt entry for function call.
6407         target->make_plt_entry(symtab, layout, gsym);
6408         break;
6409       }
6410
6411     case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
6412     case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:  // General dynamic
6413       {
6414         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6415             optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6416         if (tlsopt == tls::TLSOPT_TO_LE)
6417           {
6418             layout->set_has_static_tls();
6419             break;
6420           }
6421         gold_assert(tlsopt == tls::TLSOPT_NONE);
6422
6423         // General dynamic.
6424         Output_data_got_aarch64<size, big_endian>* got =
6425             target->got_section(symtab, layout);
6426         // Create 2 consecutive entries for module index and offset.
6427         got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
6428                                       target->rela_dyn_section(layout),
6429                                       elfcpp::R_AARCH64_TLS_DTPMOD64,
6430                                       elfcpp::R_AARCH64_TLS_DTPREL64);
6431       }
6432       break;
6433
6434     case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
6435     case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:  // Local dynamic
6436       {
6437         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6438             optimize_tls_reloc(!parameters->options().shared(), r_type);
6439         if (tlsopt == tls::TLSOPT_NONE)
6440           {
6441             // Create a GOT entry for the module index.
6442             target->got_mod_index_entry(symtab, layout, object);
6443           }
6444         else if (tlsopt != tls::TLSOPT_TO_LE)
6445           unsupported_reloc_local(object, r_type);
6446       }
6447       break;
6448
6449     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
6450     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
6451     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
6452     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:  // Other local dynamic
6453       break;
6454
6455     case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
6456     case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:  // Initial executable
6457       {
6458         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6459           optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6460         if (tlsopt == tls::TLSOPT_TO_LE)
6461           break;
6462
6463         layout->set_has_static_tls();
6464         // Create a GOT entry for the tp-relative offset.
6465         Output_data_got_aarch64<size, big_endian>* got
6466           = target->got_section(symtab, layout);
6467         if (!parameters->doing_static_link())
6468           {
6469             got->add_global_with_rel(
6470               gsym, GOT_TYPE_TLS_OFFSET,
6471               target->rela_dyn_section(layout),
6472               elfcpp::R_AARCH64_TLS_TPREL64);
6473           }
6474         if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET))
6475           {
6476             got->add_global(gsym, GOT_TYPE_TLS_OFFSET);
6477             unsigned int got_offset =
6478               gsym->got_offset(GOT_TYPE_TLS_OFFSET);
6479             const elfcpp::Elf_Xword addend = rela.get_r_addend();
6480             gold_assert(addend == 0);
6481             got->add_static_reloc(got_offset,
6482                                   elfcpp::R_AARCH64_TLS_TPREL64, gsym);
6483           }
6484       }
6485       break;
6486
6487     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
6488     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
6489     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
6490     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
6491     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
6492     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
6493     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
6494     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:  // Local executable
6495       layout->set_has_static_tls();
6496       if (parameters->options().shared())
6497         gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6498                    object->name().c_str(), r_type);
6499       break;
6500
6501     case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
6502     case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
6503     case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:  // TLS descriptor
6504       {
6505         target->define_tls_base_symbol(symtab, layout);
6506         tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6507             optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6508         if (tlsopt == tls::TLSOPT_NONE)
6509           {
6510             // Create reserved PLT and GOT entries for the resolver.
6511             target->reserve_tlsdesc_entries(symtab, layout);
6512
6513             // Create a double GOT entry with an R_AARCH64_TLSDESC
6514             // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6515             // entry needs to be in an area in .got.plt, not .got. Call
6516             // got_section to make sure the section has been created.
6517             target->got_section(symtab, layout);
6518             Output_data_got<size, big_endian>* got =
6519                 target->got_tlsdesc_section();
6520             Reloc_section* rt = target->rela_tlsdesc_section(layout);
6521             got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
6522                                           elfcpp::R_AARCH64_TLSDESC, 0);
6523           }
6524         else if (tlsopt == tls::TLSOPT_TO_IE)
6525           {
6526             // Create a GOT entry for the tp-relative offset.
6527             Output_data_got<size, big_endian>* got
6528                 = target->got_section(symtab, layout);
6529             got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
6530                                      target->rela_dyn_section(layout),
6531                                      elfcpp::R_AARCH64_TLS_TPREL64);
6532           }
6533         else if (tlsopt != tls::TLSOPT_TO_LE)
6534           unsupported_reloc_global(object, r_type, gsym);
6535       }
6536       break;
6537
6538     case elfcpp::R_AARCH64_TLSDESC_CALL:
6539       break;
6540
6541     default:
6542       gold_error(_("%s: unsupported reloc type in global scan"),
6543                  aarch64_reloc_property_table->
6544                  reloc_name_in_error_message(r_type).c_str());
6545     }
6546   return;
6547 }  // End of Scan::global
6548
6549
6550 // Create the PLT section.
6551 template<int size, bool big_endian>
6552 void
6553 Target_aarch64<size, big_endian>::make_plt_section(
6554   Symbol_table* symtab, Layout* layout)
6555 {
6556   if (this->plt_ == NULL)
6557     {
6558       // Create the GOT section first.
6559       this->got_section(symtab, layout);
6560
6561       this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
6562                                        this->got_irelative_);
6563
6564       layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
6565                                       (elfcpp::SHF_ALLOC
6566                                        | elfcpp::SHF_EXECINSTR),
6567                                       this->plt_, ORDER_PLT, false);
6568
6569       // Make the sh_info field of .rela.plt point to .plt.
6570       Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
6571       rela_plt_os->set_info_section(this->plt_->output_section());
6572     }
6573 }
6574
6575 // Return the section for TLSDESC relocations.
6576
6577 template<int size, bool big_endian>
6578 typename Target_aarch64<size, big_endian>::Reloc_section*
6579 Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const
6580 {
6581   return this->plt_section()->rela_tlsdesc(layout);
6582 }
6583
6584 // Create a PLT entry for a global symbol.
6585
6586 template<int size, bool big_endian>
6587 void
6588 Target_aarch64<size, big_endian>::make_plt_entry(
6589     Symbol_table* symtab,
6590     Layout* layout,
6591     Symbol* gsym)
6592 {
6593   if (gsym->has_plt_offset())
6594     return;
6595
6596   if (this->plt_ == NULL)
6597     this->make_plt_section(symtab, layout);
6598
6599   this->plt_->add_entry(symtab, layout, gsym);
6600 }
6601
6602 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6603
6604 template<int size, bool big_endian>
6605 void
6606 Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry(
6607     Symbol_table* symtab, Layout* layout,
6608     Sized_relobj_file<size, big_endian>* relobj,
6609     unsigned int local_sym_index)
6610 {
6611   if (relobj->local_has_plt_offset(local_sym_index))
6612     return;
6613   if (this->plt_ == NULL)
6614     this->make_plt_section(symtab, layout);
6615   unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
6616                                                               relobj,
6617                                                               local_sym_index);
6618   relobj->set_local_plt_offset(local_sym_index, plt_offset);
6619 }
6620
6621 template<int size, bool big_endian>
6622 void
6623 Target_aarch64<size, big_endian>::gc_process_relocs(
6624     Symbol_table* symtab,
6625     Layout* layout,
6626     Sized_relobj_file<size, big_endian>* object,
6627     unsigned int data_shndx,
6628     unsigned int sh_type,
6629     const unsigned char* prelocs,
6630     size_t reloc_count,
6631     Output_section* output_section,
6632     bool needs_special_offset_handling,
6633     size_t local_symbol_count,
6634     const unsigned char* plocal_symbols)
6635 {
6636   if (sh_type == elfcpp::SHT_REL)
6637     {
6638       return;
6639     }
6640
6641   gold::gc_process_relocs<
6642     size, big_endian,
6643     Target_aarch64<size, big_endian>,
6644     elfcpp::SHT_RELA,
6645     typename Target_aarch64<size, big_endian>::Scan,
6646     typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>(
6647     symtab,
6648     layout,
6649     this,
6650     object,
6651     data_shndx,
6652     prelocs,
6653     reloc_count,
6654     output_section,
6655     needs_special_offset_handling,
6656     local_symbol_count,
6657     plocal_symbols);
6658 }
6659
6660 // Scan relocations for a section.
6661
6662 template<int size, bool big_endian>
6663 void
6664 Target_aarch64<size, big_endian>::scan_relocs(
6665     Symbol_table* symtab,
6666     Layout* layout,
6667     Sized_relobj_file<size, big_endian>* object,
6668     unsigned int data_shndx,
6669     unsigned int sh_type,
6670     const unsigned char* prelocs,
6671     size_t reloc_count,
6672     Output_section* output_section,
6673     bool needs_special_offset_handling,
6674     size_t local_symbol_count,
6675     const unsigned char* plocal_symbols)
6676 {
6677   if (sh_type == elfcpp::SHT_REL)
6678     {
6679       gold_error(_("%s: unsupported REL reloc section"),
6680                  object->name().c_str());
6681       return;
6682     }
6683   gold::scan_relocs<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, Scan>(
6684     symtab,
6685     layout,
6686     this,
6687     object,
6688     data_shndx,
6689     prelocs,
6690     reloc_count,
6691     output_section,
6692     needs_special_offset_handling,
6693     local_symbol_count,
6694     plocal_symbols);
6695 }
6696
6697 // Return the value to use for a dynamic which requires special
6698 // treatment.  This is how we support equality comparisons of function
6699 // pointers across shared library boundaries, as described in the
6700 // processor specific ABI supplement.
6701
6702 template<int size, bool big_endian>
6703 uint64_t
6704 Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
6705 {
6706   gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
6707   return this->plt_address_for_global(gsym);
6708 }
6709
6710
6711 // Finalize the sections.
6712
6713 template<int size, bool big_endian>
6714 void
6715 Target_aarch64<size, big_endian>::do_finalize_sections(
6716     Layout* layout,
6717     const Input_objects*,
6718     Symbol_table* symtab)
6719 {
6720   const Reloc_section* rel_plt = (this->plt_ == NULL
6721                                   ? NULL
6722                                   : this->plt_->rela_plt());
6723   layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
6724                                   this->rela_dyn_, true, false);
6725
6726   // Emit any relocs we saved in an attempt to avoid generating COPY
6727   // relocs.
6728   if (this->copy_relocs_.any_saved_relocs())
6729     this->copy_relocs_.emit(this->rela_dyn_section(layout));
6730
6731   // Fill in some more dynamic tags.
6732   Output_data_dynamic* const odyn = layout->dynamic_data();
6733   if (odyn != NULL)
6734     {
6735       if (this->plt_ != NULL
6736           && this->plt_->output_section() != NULL
6737           && this->plt_ ->has_tlsdesc_entry())
6738         {
6739           unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
6740           unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
6741           this->got_->finalize_data_size();
6742           odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
6743                                         this->plt_, plt_offset);
6744           odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
6745                                         this->got_, got_offset);
6746         }
6747     }
6748
6749   // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6750   // the .got.plt section.
6751   Symbol* sym = this->global_offset_table_;
6752   if (sym != NULL)
6753     {
6754       uint64_t data_size = this->got_plt_->current_data_size();
6755       symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
6756
6757       // If the .got section is more than 0x8000 bytes, we add
6758       // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6759       // bit relocations have a greater chance of working.
6760       if (data_size >= 0x8000)
6761         symtab->get_sized_symbol<size>(sym)->set_value(
6762           symtab->get_sized_symbol<size>(sym)->value() + 0x8000);
6763     }
6764
6765   if (parameters->doing_static_link()
6766       && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
6767     {
6768       // If linking statically, make sure that the __rela_iplt symbols
6769       // were defined if necessary, even if we didn't create a PLT.
6770       static const Define_symbol_in_segment syms[] =
6771         {
6772           {
6773             "__rela_iplt_start",        // name
6774             elfcpp::PT_LOAD,            // segment_type
6775             elfcpp::PF_W,               // segment_flags_set
6776             elfcpp::PF(0),              // segment_flags_clear
6777             0,                          // value
6778             0,                          // size
6779             elfcpp::STT_NOTYPE,         // type
6780             elfcpp::STB_GLOBAL,         // binding
6781             elfcpp::STV_HIDDEN,         // visibility
6782             0,                          // nonvis
6783             Symbol::SEGMENT_START,      // offset_from_base
6784             true                        // only_if_ref
6785           },
6786           {
6787             "__rela_iplt_end",          // name
6788             elfcpp::PT_LOAD,            // segment_type
6789             elfcpp::PF_W,               // segment_flags_set
6790             elfcpp::PF(0),              // segment_flags_clear
6791             0,                          // value
6792             0,                          // size
6793             elfcpp::STT_NOTYPE,         // type
6794             elfcpp::STB_GLOBAL,         // binding
6795             elfcpp::STV_HIDDEN,         // visibility
6796             0,                          // nonvis
6797             Symbol::SEGMENT_START,      // offset_from_base
6798             true                        // only_if_ref
6799           }
6800         };
6801
6802       symtab->define_symbols(layout, 2, syms,
6803                              layout->script_options()->saw_sections_clause());
6804     }
6805
6806   return;
6807 }
6808
6809 // Perform a relocation.
6810
6811 template<int size, bool big_endian>
6812 inline bool
6813 Target_aarch64<size, big_endian>::Relocate::relocate(
6814     const Relocate_info<size, big_endian>* relinfo,
6815     Target_aarch64<size, big_endian>* target,
6816     Output_section* ,
6817     size_t relnum,
6818     const elfcpp::Rela<size, big_endian>& rela,
6819     unsigned int r_type,
6820     const Sized_symbol<size>* gsym,
6821     const Symbol_value<size>* psymval,
6822     unsigned char* view,
6823     typename elfcpp::Elf_types<size>::Elf_Addr address,
6824     section_size_type /* view_size */)
6825 {
6826   if (view == NULL)
6827     return true;
6828
6829   typedef AArch64_relocate_functions<size, big_endian> Reloc;
6830
6831   const AArch64_reloc_property* reloc_property =
6832       aarch64_reloc_property_table->get_reloc_property(r_type);
6833
6834   if (reloc_property == NULL)
6835     {
6836       std::string reloc_name =
6837           aarch64_reloc_property_table->reloc_name_in_error_message(r_type);
6838       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
6839                              _("cannot relocate %s in object file"),
6840                              reloc_name.c_str());
6841       return true;
6842     }
6843
6844   const Sized_relobj_file<size, big_endian>* object = relinfo->object;
6845
6846   // Pick the value to use for symbols defined in the PLT.
6847   Symbol_value<size> symval;
6848   if (gsym != NULL
6849       && gsym->use_plt_offset(reloc_property->reference_flags()))
6850     {
6851       symval.set_output_value(target->plt_address_for_global(gsym));
6852       psymval = &symval;
6853     }
6854   else if (gsym == NULL && psymval->is_ifunc_symbol())
6855     {
6856       unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6857       if (object->local_has_plt_offset(r_sym))
6858         {
6859           symval.set_output_value(target->plt_address_for_local(object, r_sym));
6860           psymval = &symval;
6861         }
6862     }
6863
6864   const elfcpp::Elf_Xword addend = rela.get_r_addend();
6865
6866   // Get the GOT offset if needed.
6867   // For aarch64, the GOT pointer points to the start of the GOT section.
6868   bool have_got_offset = false;
6869   int got_offset = 0;
6870   int got_base = (target->got_ != NULL
6871                   ? (target->got_->current_data_size() >= 0x8000
6872                      ? 0x8000 : 0)
6873                   : 0);
6874   switch (r_type)
6875     {
6876     case elfcpp::R_AARCH64_MOVW_GOTOFF_G0:
6877     case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC:
6878     case elfcpp::R_AARCH64_MOVW_GOTOFF_G1:
6879     case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC:
6880     case elfcpp::R_AARCH64_MOVW_GOTOFF_G2:
6881     case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC:
6882     case elfcpp::R_AARCH64_MOVW_GOTOFF_G3:
6883     case elfcpp::R_AARCH64_GOTREL64:
6884     case elfcpp::R_AARCH64_GOTREL32:
6885     case elfcpp::R_AARCH64_GOT_LD_PREL19:
6886     case elfcpp::R_AARCH64_LD64_GOTOFF_LO15:
6887     case elfcpp::R_AARCH64_ADR_GOT_PAGE:
6888     case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
6889     case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
6890       if (gsym != NULL)
6891         {
6892           gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
6893           got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base;
6894         }
6895       else
6896         {
6897           unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6898           gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
6899           got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
6900                         - got_base);
6901         }
6902       have_got_offset = true;
6903       break;
6904
6905     default:
6906       break;
6907     }
6908
6909   typename Reloc::Status reloc_status = Reloc::STATUS_OKAY;
6910   typename elfcpp::Elf_types<size>::Elf_Addr value;
6911   switch (r_type)
6912     {
6913     case elfcpp::R_AARCH64_NONE:
6914       break;
6915
6916     case elfcpp::R_AARCH64_ABS64:
6917       if (!parameters->options().apply_dynamic_relocs()
6918           && parameters->options().output_is_position_independent()
6919           && gsym != NULL
6920           && gsym->needs_dynamic_reloc(reloc_property->reference_flags())
6921           && !gsym->can_use_relative_reloc(false))
6922         // We have generated an absolute dynamic relocation, so do not
6923         // apply the relocation statically. (Works around bugs in older
6924         // Android dynamic linkers.)
6925         break;
6926       reloc_status = Reloc::template rela_ua<64>(
6927         view, object, psymval, addend, reloc_property);
6928       break;
6929
6930     case elfcpp::R_AARCH64_ABS32:
6931       if (!parameters->options().apply_dynamic_relocs()
6932           && parameters->options().output_is_position_independent()
6933           && gsym != NULL
6934           && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
6935         // We have generated an absolute dynamic relocation, so do not
6936         // apply the relocation statically. (Works around bugs in older
6937         // Android dynamic linkers.)
6938         break;
6939       reloc_status = Reloc::template rela_ua<32>(
6940         view, object, psymval, addend, reloc_property);
6941       break;
6942
6943     case elfcpp::R_AARCH64_ABS16:
6944       if (!parameters->options().apply_dynamic_relocs()
6945           && parameters->options().output_is_position_independent()
6946           && gsym != NULL
6947           && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
6948         // We have generated an absolute dynamic relocation, so do not
6949         // apply the relocation statically. (Works around bugs in older
6950         // Android dynamic linkers.)
6951         break;
6952       reloc_status = Reloc::template rela_ua<16>(
6953         view, object, psymval, addend, reloc_property);
6954       break;
6955
6956     case elfcpp::R_AARCH64_PREL64:
6957       reloc_status = Reloc::template pcrela_ua<64>(
6958         view, object, psymval, addend, address, reloc_property);
6959       break;
6960
6961     case elfcpp::R_AARCH64_PREL32:
6962       reloc_status = Reloc::template pcrela_ua<32>(
6963         view, object, psymval, addend, address, reloc_property);
6964       break;
6965
6966     case elfcpp::R_AARCH64_PREL16:
6967       reloc_status = Reloc::template pcrela_ua<16>(
6968         view, object, psymval, addend, address, reloc_property);
6969       break;
6970
6971     case elfcpp::R_AARCH64_LD_PREL_LO19:
6972       reloc_status = Reloc::template pcrela_general<32>(
6973           view, object, psymval, addend, address, reloc_property);
6974       break;
6975
6976     case elfcpp::R_AARCH64_ADR_PREL_LO21:
6977       reloc_status = Reloc::adr(view, object, psymval, addend,
6978                                 address, reloc_property);
6979       break;
6980
6981     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
6982     case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
6983       reloc_status = Reloc::adrp(view, object, psymval, addend, address,
6984                                  reloc_property);
6985       break;
6986
6987     case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC:
6988     case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC:
6989     case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC:
6990     case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC:
6991     case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC:
6992     case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
6993       reloc_status = Reloc::template rela_general<32>(
6994         view, object, psymval, addend, reloc_property);
6995       break;
6996
6997     case elfcpp::R_AARCH64_CALL26:
6998       if (this->skip_call_tls_get_addr_)
6999         {
7000           // Double check that the TLSGD insn has been optimized away.
7001           typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7002           Insntype insn = elfcpp::Swap<32, big_endian>::readval(
7003               reinterpret_cast<Insntype*>(view));
7004           gold_assert((insn & 0xff000000) == 0x91000000);
7005
7006           reloc_status = Reloc::STATUS_OKAY;
7007           this->skip_call_tls_get_addr_ = false;
7008           // Return false to stop further processing this reloc.
7009           return false;
7010         }
7011       // Fallthrough
7012     case elfcpp::R_AARCH64_JUMP26:
7013       if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address,
7014                                   gsym, psymval, object,
7015                                   target->stub_group_size_))
7016         break;
7017       // Fallthrough
7018     case elfcpp::R_AARCH64_TSTBR14:
7019     case elfcpp::R_AARCH64_CONDBR19:
7020       reloc_status = Reloc::template pcrela_general<32>(
7021         view, object, psymval, addend, address, reloc_property);
7022       break;
7023
7024     case elfcpp::R_AARCH64_ADR_GOT_PAGE:
7025       gold_assert(have_got_offset);
7026       value = target->got_->address() + got_base + got_offset;
7027       reloc_status = Reloc::adrp(view, value + addend, address);
7028       break;
7029
7030     case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
7031       gold_assert(have_got_offset);
7032       value = target->got_->address() + got_base + got_offset;
7033       reloc_status = Reloc::template rela_general<32>(
7034         view, value, addend, reloc_property);
7035       break;
7036
7037     case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7038     case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
7039     case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7040     case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
7041     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7042     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7043     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7044     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
7045     case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7046     case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
7047     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7048     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7049     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
7050     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7051     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
7052     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
7053     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
7054     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
7055     case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7056     case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7057     case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7058     case elfcpp::R_AARCH64_TLSDESC_CALL:
7059       reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type,
7060                                   gsym, psymval, view, address);
7061       break;
7062
7063     // These are dynamic relocations, which are unexpected when linking.
7064     case elfcpp::R_AARCH64_COPY:
7065     case elfcpp::R_AARCH64_GLOB_DAT:
7066     case elfcpp::R_AARCH64_JUMP_SLOT:
7067     case elfcpp::R_AARCH64_RELATIVE:
7068     case elfcpp::R_AARCH64_IRELATIVE:
7069     case elfcpp::R_AARCH64_TLS_DTPREL64:
7070     case elfcpp::R_AARCH64_TLS_DTPMOD64:
7071     case elfcpp::R_AARCH64_TLS_TPREL64:
7072     case elfcpp::R_AARCH64_TLSDESC:
7073       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7074                              _("unexpected reloc %u in object file"),
7075                              r_type);
7076       break;
7077
7078     default:
7079       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7080                              _("unsupported reloc %s"),
7081                              reloc_property->name().c_str());
7082       break;
7083     }
7084
7085   // Report any errors.
7086   switch (reloc_status)
7087     {
7088     case Reloc::STATUS_OKAY:
7089       break;
7090     case Reloc::STATUS_OVERFLOW:
7091       gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7092                              _("relocation overflow in %s"),
7093                              reloc_property->name().c_str());
7094       break;
7095     case Reloc::STATUS_BAD_RELOC:
7096       gold_error_at_location(
7097           relinfo,
7098           relnum,
7099           rela.get_r_offset(),
7100           _("unexpected opcode while processing relocation %s"),
7101           reloc_property->name().c_str());
7102       break;
7103     default:
7104       gold_unreachable();
7105     }
7106
7107   return true;
7108 }
7109
7110
7111 template<int size, bool big_endian>
7112 inline
7113 typename AArch64_relocate_functions<size, big_endian>::Status
7114 Target_aarch64<size, big_endian>::Relocate::relocate_tls(
7115     const Relocate_info<size, big_endian>* relinfo,
7116     Target_aarch64<size, big_endian>* target,
7117     size_t relnum,
7118     const elfcpp::Rela<size, big_endian>& rela,
7119     unsigned int r_type, const Sized_symbol<size>* gsym,
7120     const Symbol_value<size>* psymval,
7121     unsigned char* view,
7122     typename elfcpp::Elf_types<size>::Elf_Addr address)
7123 {
7124   typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7125   typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7126
7127   Output_segment* tls_segment = relinfo->layout->tls_segment();
7128   const elfcpp::Elf_Xword addend = rela.get_r_addend();
7129   const AArch64_reloc_property* reloc_property =
7130       aarch64_reloc_property_table->get_reloc_property(r_type);
7131   gold_assert(reloc_property != NULL);
7132
7133   const bool is_final = (gsym == NULL
7134                          ? !parameters->options().shared()
7135                          : gsym->final_value_is_known());
7136   tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
7137       optimize_tls_reloc(is_final, r_type);
7138
7139   Sized_relobj_file<size, big_endian>* object = relinfo->object;
7140   int tls_got_offset_type;
7141   switch (r_type)
7142     {
7143     case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7144     case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:  // Global-dynamic
7145       {
7146         if (tlsopt == tls::TLSOPT_TO_LE)
7147           {
7148             if (tls_segment == NULL)
7149               {
7150                 gold_assert(parameters->errors()->error_count() > 0
7151                             || issue_undefined_symbol_error(gsym));
7152                 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7153               }
7154             return tls_gd_to_le(relinfo, target, rela, r_type, view,
7155                                 psymval);
7156           }
7157         else if (tlsopt == tls::TLSOPT_NONE)
7158           {
7159             tls_got_offset_type = GOT_TYPE_TLS_PAIR;
7160             // Firstly get the address for the got entry.
7161             typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7162             if (gsym != NULL)
7163               {
7164                 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7165                 got_entry_address = target->got_->address() +
7166                                     gsym->got_offset(tls_got_offset_type);
7167               }
7168             else
7169               {
7170                 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7171                 gold_assert(
7172                   object->local_has_got_offset(r_sym, tls_got_offset_type));
7173                 got_entry_address = target->got_->address() +
7174                   object->local_got_offset(r_sym, tls_got_offset_type);
7175               }
7176
7177             // Relocate the address into adrp/ld, adrp/add pair.
7178             switch (r_type)
7179               {
7180               case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7181                 return aarch64_reloc_funcs::adrp(
7182                   view, got_entry_address + addend, address);
7183
7184                 break;
7185
7186               case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
7187                 return aarch64_reloc_funcs::template rela_general<32>(
7188                   view, got_entry_address, addend, reloc_property);
7189                 break;
7190
7191               default:
7192                 gold_unreachable();
7193               }
7194           }
7195         gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7196                                _("unsupported gd_to_ie relaxation on %u"),
7197                                r_type);
7198       }
7199       break;
7200
7201     case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7202     case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:  // Local-dynamic
7203       {
7204         if (tlsopt == tls::TLSOPT_TO_LE)
7205           {
7206             if (tls_segment == NULL)
7207               {
7208                 gold_assert(parameters->errors()->error_count() > 0
7209                             || issue_undefined_symbol_error(gsym));
7210                 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7211               }
7212             return this->tls_ld_to_le(relinfo, target, rela, r_type, view,
7213                                       psymval);
7214           }
7215
7216         gold_assert(tlsopt == tls::TLSOPT_NONE);
7217         // Relocate the field with the offset of the GOT entry for
7218         // the module index.
7219         typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7220         got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) +
7221                              target->got_->address());
7222
7223         switch (r_type)
7224           {
7225           case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7226             return aarch64_reloc_funcs::adrp(
7227               view, got_entry_address + addend, address);
7228             break;
7229
7230           case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
7231             return aarch64_reloc_funcs::template rela_general<32>(
7232               view, got_entry_address, addend, reloc_property);
7233             break;
7234
7235           default:
7236             gold_unreachable();
7237           }
7238       }
7239       break;
7240
7241     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7242     case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7243     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7244     case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:  // Other local-dynamic
7245       {
7246         AArch64_address value = psymval->value(object, 0);
7247         if (tlsopt == tls::TLSOPT_TO_LE)
7248           {
7249             if (tls_segment == NULL)
7250               {
7251                 gold_assert(parameters->errors()->error_count() > 0
7252                             || issue_undefined_symbol_error(gsym));
7253                 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7254               }
7255           }
7256         switch (r_type)
7257           {
7258           case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7259             return aarch64_reloc_funcs::movnz(view, value + addend,
7260                                               reloc_property);
7261             break;
7262
7263           case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7264           case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7265           case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
7266             return aarch64_reloc_funcs::template rela_general<32>(
7267                 view, value, addend, reloc_property);
7268             break;
7269
7270           default:
7271             gold_unreachable();
7272           }
7273         // We should never reach here.
7274       }
7275       break;
7276
7277     case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7278     case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:  // Initial-exec
7279       {
7280         if (tlsopt == tls::TLSOPT_TO_LE)
7281           {
7282             if (tls_segment == NULL)
7283               {
7284                 gold_assert(parameters->errors()->error_count() > 0
7285                             || issue_undefined_symbol_error(gsym));
7286                 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7287               }
7288             return tls_ie_to_le(relinfo, target, rela, r_type, view,
7289                                 psymval);
7290           }
7291         tls_got_offset_type = GOT_TYPE_TLS_OFFSET;
7292
7293         // Firstly get the address for the got entry.
7294         typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7295         if (gsym != NULL)
7296           {
7297             gold_assert(gsym->has_got_offset(tls_got_offset_type));
7298             got_entry_address = target->got_->address() +
7299                                 gsym->got_offset(tls_got_offset_type);
7300           }
7301         else
7302           {
7303             unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7304             gold_assert(
7305                 object->local_has_got_offset(r_sym, tls_got_offset_type));
7306             got_entry_address = target->got_->address() +
7307                 object->local_got_offset(r_sym, tls_got_offset_type);
7308           }
7309         // Relocate the address into adrp/ld, adrp/add pair.
7310         switch (r_type)
7311           {
7312           case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7313             return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
7314                                              address);
7315             break;
7316           case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
7317             return aarch64_reloc_funcs::template rela_general<32>(
7318               view, got_entry_address, addend, reloc_property);
7319           default:
7320             gold_unreachable();
7321           }
7322       }
7323       // We shall never reach here.
7324       break;
7325
7326     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7327     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7328     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
7329     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7330     case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
7331     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
7332     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
7333     case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
7334       {
7335         gold_assert(tls_segment != NULL);
7336         AArch64_address value = psymval->value(object, 0);
7337
7338         if (!parameters->options().shared())
7339           {
7340             AArch64_address aligned_tcb_size =
7341                 align_address(target->tcb_size(),
7342                               tls_segment->maximum_alignment());
7343             value += aligned_tcb_size;
7344             switch (r_type)
7345               {
7346               case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7347               case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7348               case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7349                 return aarch64_reloc_funcs::movnz(view, value + addend,
7350                                                   reloc_property);
7351               default:
7352                 return aarch64_reloc_funcs::template
7353                   rela_general<32>(view,
7354                                    value,
7355                                    addend,
7356                                    reloc_property);
7357               }
7358           }
7359         else
7360           gold_error(_("%s: unsupported reloc %u "
7361                        "in non-static TLSLE mode."),
7362                      object->name().c_str(), r_type);
7363       }
7364       break;
7365
7366     case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7367     case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7368     case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7369     case elfcpp::R_AARCH64_TLSDESC_CALL:
7370       {
7371         if (tlsopt == tls::TLSOPT_TO_LE)
7372           {
7373             if (tls_segment == NULL)
7374               {
7375                 gold_assert(parameters->errors()->error_count() > 0
7376                             || issue_undefined_symbol_error(gsym));
7377                 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7378               }
7379             return tls_desc_gd_to_le(relinfo, target, rela, r_type,
7380                                      view, psymval);
7381           }
7382         else
7383           {
7384             tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE
7385                                    ? GOT_TYPE_TLS_OFFSET
7386                                    : GOT_TYPE_TLS_DESC);
7387             unsigned int got_tlsdesc_offset = 0;
7388             if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL
7389                 && tlsopt == tls::TLSOPT_NONE)
7390               {
7391                 // We created GOT entries in the .got.tlsdesc portion of the
7392                 // .got.plt section, but the offset stored in the symbol is the
7393                 // offset within .got.tlsdesc.
7394                 got_tlsdesc_offset = (target->got_->data_size()
7395                                       + target->got_plt_section()->data_size());
7396               }
7397             typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7398             if (gsym != NULL)
7399               {
7400                 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7401                 got_entry_address = target->got_->address()
7402                                     + got_tlsdesc_offset
7403                                     + gsym->got_offset(tls_got_offset_type);
7404               }
7405             else
7406               {
7407                 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7408                 gold_assert(
7409                     object->local_has_got_offset(r_sym, tls_got_offset_type));
7410                 got_entry_address = target->got_->address() +
7411                   got_tlsdesc_offset +
7412                   object->local_got_offset(r_sym, tls_got_offset_type);
7413               }
7414             if (tlsopt == tls::TLSOPT_TO_IE)
7415               {
7416                 if (tls_segment == NULL)
7417                   {
7418                     gold_assert(parameters->errors()->error_count() > 0
7419                                 || issue_undefined_symbol_error(gsym));
7420                     return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7421                   }
7422                 return tls_desc_gd_to_ie(relinfo, target, rela, r_type,
7423                                          view, psymval, got_entry_address,
7424                                          address);
7425               }
7426
7427             // Now do tlsdesc relocation.
7428             switch (r_type)
7429               {
7430               case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7431                 return aarch64_reloc_funcs::adrp(view,
7432                                                  got_entry_address + addend,
7433                                                  address);
7434                 break;
7435               case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7436               case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7437                 return aarch64_reloc_funcs::template rela_general<32>(
7438                   view, got_entry_address, addend, reloc_property);
7439                 break;
7440               case elfcpp::R_AARCH64_TLSDESC_CALL:
7441                 return aarch64_reloc_funcs::STATUS_OKAY;
7442                 break;
7443               default:
7444                 gold_unreachable();
7445               }
7446           }
7447         }
7448       break;
7449
7450     default:
7451       gold_error(_("%s: unsupported TLS reloc %u."),
7452                  object->name().c_str(), r_type);
7453     }
7454   return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7455 }  // End of relocate_tls.
7456
7457
7458 template<int size, bool big_endian>
7459 inline
7460 typename AArch64_relocate_functions<size, big_endian>::Status
7461 Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le(
7462              const Relocate_info<size, big_endian>* relinfo,
7463              Target_aarch64<size, big_endian>* target,
7464              const elfcpp::Rela<size, big_endian>& rela,
7465              unsigned int r_type,
7466              unsigned char* view,
7467              const Symbol_value<size>* psymval)
7468 {
7469   typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7470   typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7471   typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7472
7473   Insntype* ip = reinterpret_cast<Insntype*>(view);
7474   Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
7475   Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
7476   Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
7477
7478   if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC)
7479     {
7480       // This is the 2nd relocs, optimization should already have been
7481       // done.
7482       gold_assert((insn1 & 0xfff00000) == 0x91400000);
7483       return aarch64_reloc_funcs::STATUS_OKAY;
7484     }
7485
7486   // The original sequence is -
7487   //   90000000        adrp    x0, 0 <main>
7488   //   91000000        add     x0, x0, #0x0
7489   //   94000000        bl      0 <__tls_get_addr>
7490   // optimized to sequence -
7491   //   d53bd040        mrs     x0, tpidr_el0
7492   //   91400000        add     x0, x0, #0x0, lsl #12
7493   //   91000000        add     x0, x0, #0x0
7494
7495   // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7496   // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7497   // have to change "bl tls_get_addr", which does not have a corresponding tls
7498   // relocation type. So before proceeding, we need to make sure compiler
7499   // does not change the sequence.
7500   if(!(insn1 == 0x90000000      // adrp x0,0
7501        && insn2 == 0x91000000   // add x0, x0, #0x0
7502        && insn3 == 0x94000000)) // bl 0
7503     {
7504       // Ideally we should give up gd_to_le relaxation and do gd access.
7505       // However the gd_to_le relaxation decision has been made early
7506       // in the scan stage, where we did not allocate any GOT entry for
7507       // this symbol. Therefore we have to exit and report error now.
7508       gold_error(_("unexpected reloc insn sequence while relaxing "
7509                    "tls gd to le for reloc %u."), r_type);
7510       return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7511     }
7512
7513   // Write new insns.
7514   insn1 = 0xd53bd040;  // mrs x0, tpidr_el0
7515   insn2 = 0x91400000;  // add x0, x0, #0x0, lsl #12
7516   insn3 = 0x91000000;  // add x0, x0, #0x0
7517   elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
7518   elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
7519   elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
7520
7521   // Calculate tprel value.
7522   Output_segment* tls_segment = relinfo->layout->tls_segment();
7523   gold_assert(tls_segment != NULL);
7524   AArch64_address value = psymval->value(relinfo->object, 0);
7525   const elfcpp::Elf_Xword addend = rela.get_r_addend();
7526   AArch64_address aligned_tcb_size =
7527       align_address(target->tcb_size(), tls_segment->maximum_alignment());
7528   AArch64_address x = value + aligned_tcb_size;
7529
7530   // After new insns are written, apply TLSLE relocs.
7531   const AArch64_reloc_property* rp1 =
7532       aarch64_reloc_property_table->get_reloc_property(
7533           elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
7534   const AArch64_reloc_property* rp2 =
7535       aarch64_reloc_property_table->get_reloc_property(
7536           elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
7537   gold_assert(rp1 != NULL && rp2 != NULL);
7538
7539   typename aarch64_reloc_funcs::Status s1 =
7540       aarch64_reloc_funcs::template rela_general<32>(view + 4,
7541                                                      x,
7542                                                      addend,
7543                                                      rp1);
7544   if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
7545     return s1;
7546
7547   typename aarch64_reloc_funcs::Status s2 =
7548       aarch64_reloc_funcs::template rela_general<32>(view + 8,
7549                                                      x,
7550                                                      addend,
7551                                                      rp2);
7552
7553   this->skip_call_tls_get_addr_ = true;
7554   return s2;
7555 }  // End of tls_gd_to_le
7556
7557
7558 template<int size, bool big_endian>
7559 inline
7560 typename AArch64_relocate_functions<size, big_endian>::Status
7561 Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le(
7562              const Relocate_info<size, big_endian>* relinfo,
7563              Target_aarch64<size, big_endian>* target,
7564              const elfcpp::Rela<size, big_endian>& rela,
7565              unsigned int r_type,
7566              unsigned char* view,
7567              const Symbol_value<size>* psymval)
7568 {
7569   typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7570   typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7571   typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7572
7573   Insntype* ip = reinterpret_cast<Insntype*>(view);
7574   Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
7575   Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
7576   Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
7577
7578   if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC)
7579     {
7580       // This is the 2nd relocs, optimization should already have been
7581       // done.
7582       gold_assert((insn1 & 0xfff00000) == 0x91400000);
7583       return aarch64_reloc_funcs::STATUS_OKAY;
7584     }
7585
7586   // The original sequence is -
7587   //   90000000        adrp    x0, 0 <main>
7588   //   91000000        add     x0, x0, #0x0
7589   //   94000000        bl      0 <__tls_get_addr>
7590   // optimized to sequence -
7591   //   d53bd040        mrs     x0, tpidr_el0
7592   //   91400000        add     x0, x0, #0x0, lsl #12
7593   //   91000000        add     x0, x0, #0x0
7594
7595   // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7596   // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7597   // have to change "bl tls_get_addr", which does not have a corresponding tls
7598   // relocation type. So before proceeding, we need to make sure compiler
7599   // does not change the sequence.
7600   if(!(insn1 == 0x90000000      // adrp x0,0
7601        && insn2 == 0x91000000   // add x0, x0, #0x0
7602        && insn3 == 0x94000000)) // bl 0
7603     {
7604       // Ideally we should give up gd_to_le relaxation and do gd access.
7605       // However the gd_to_le relaxation decision has been made early
7606       // in the scan stage, where we did not allocate any GOT entry for
7607       // this symbol. Therefore we have to exit and report error now.
7608       gold_error(_("unexpected reloc insn sequence while relaxing "
7609                    "tls gd to le for reloc %u."), r_type);
7610       return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7611     }
7612
7613   // Write new insns.
7614   insn1 = 0xd53bd040;  // mrs x0, tpidr_el0
7615   insn2 = 0x91400000;  // add x0, x0, #0x0, lsl #12
7616   insn3 = 0x91000000;  // add x0, x0, #0x0
7617   elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
7618   elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
7619   elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
7620
7621   // Calculate tprel value.
7622   Output_segment* tls_segment = relinfo->layout->tls_segment();
7623   gold_assert(tls_segment != NULL);
7624   AArch64_address value = psymval->value(relinfo->object, 0);
7625   const elfcpp::Elf_Xword addend = rela.get_r_addend();
7626   AArch64_address aligned_tcb_size =
7627       align_address(target->tcb_size(), tls_segment->maximum_alignment());
7628   AArch64_address x = value + aligned_tcb_size;
7629
7630   // After new insns are written, apply TLSLE relocs.
7631   const AArch64_reloc_property* rp1 =
7632       aarch64_reloc_property_table->get_reloc_property(
7633           elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
7634   const AArch64_reloc_property* rp2 =
7635       aarch64_reloc_property_table->get_reloc_property(
7636           elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
7637   gold_assert(rp1 != NULL && rp2 != NULL);
7638
7639   typename aarch64_reloc_funcs::Status s1 =
7640       aarch64_reloc_funcs::template rela_general<32>(view + 4,
7641                                                      x,
7642                                                      addend,
7643                                                      rp1);
7644   if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
7645     return s1;
7646
7647   typename aarch64_reloc_funcs::Status s2 =
7648       aarch64_reloc_funcs::template rela_general<32>(view + 8,
7649                                                      x,
7650                                                      addend,
7651                                                      rp2);
7652
7653   this->skip_call_tls_get_addr_ = true;
7654   return s2;
7655
7656 }  // End of tls_ld_to_le
7657
7658 template<int size, bool big_endian>
7659 inline
7660 typename AArch64_relocate_functions<size, big_endian>::Status
7661 Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le(
7662              const Relocate_info<size, big_endian>* relinfo,
7663              Target_aarch64<size, big_endian>* target,
7664              const elfcpp::Rela<size, big_endian>& rela,
7665              unsigned int r_type,
7666              unsigned char* view,
7667              const Symbol_value<size>* psymval)
7668 {
7669   typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7670   typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7671   typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7672
7673   AArch64_address value = psymval->value(relinfo->object, 0);
7674   Output_segment* tls_segment = relinfo->layout->tls_segment();
7675   AArch64_address aligned_tcb_address =
7676       align_address(target->tcb_size(), tls_segment->maximum_alignment());
7677   const elfcpp::Elf_Xword addend = rela.get_r_addend();
7678   AArch64_address x = value + addend + aligned_tcb_address;
7679   // "x" is the offset to tp, we can only do this if x is within
7680   // range [0, 2^32-1]
7681   if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0)))
7682     {
7683       gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7684                  r_type);
7685       return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7686     }
7687
7688   Insntype* ip = reinterpret_cast<Insntype*>(view);
7689   Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
7690   unsigned int regno;
7691   Insntype newinsn;
7692   if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21)
7693     {
7694       // Generate movz.
7695       regno = (insn & 0x1f);
7696       newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5);
7697     }
7698   else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC)
7699     {
7700       // Generate movk.
7701       regno = (insn & 0x1f);
7702       gold_assert(regno == ((insn >> 5) & 0x1f));
7703       newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5);
7704     }
7705   else
7706     gold_unreachable();
7707
7708   elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7709   return aarch64_reloc_funcs::STATUS_OKAY;
7710 }  // End of tls_ie_to_le
7711
7712
7713 template<int size, bool big_endian>
7714 inline
7715 typename AArch64_relocate_functions<size, big_endian>::Status
7716 Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le(
7717              const Relocate_info<size, big_endian>* relinfo,
7718              Target_aarch64<size, big_endian>* target,
7719              const elfcpp::Rela<size, big_endian>& rela,
7720              unsigned int r_type,
7721              unsigned char* view,
7722              const Symbol_value<size>* psymval)
7723 {
7724   typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7725   typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7726   typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7727
7728   // TLSDESC-GD sequence is like:
7729   //   adrp  x0, :tlsdesc:v1
7730   //   ldr   x1, [x0, #:tlsdesc_lo12:v1]
7731   //   add   x0, x0, :tlsdesc_lo12:v1
7732   //   .tlsdesccall    v1
7733   //   blr   x1
7734   // After desc_gd_to_le optimization, the sequence will be like:
7735   //   movz  x0, #0x0, lsl #16
7736   //   movk  x0, #0x10
7737   //   nop
7738   //   nop
7739
7740   // Calculate tprel value.
7741   Output_segment* tls_segment = relinfo->layout->tls_segment();
7742   gold_assert(tls_segment != NULL);
7743   Insntype* ip = reinterpret_cast<Insntype*>(view);
7744   const elfcpp::Elf_Xword addend = rela.get_r_addend();
7745   AArch64_address value = psymval->value(relinfo->object, addend);
7746   AArch64_address aligned_tcb_size =
7747       align_address(target->tcb_size(), tls_segment->maximum_alignment());
7748   AArch64_address x = value + aligned_tcb_size;
7749   // x is the offset to tp, we can only do this if x is within range
7750   // [0, 2^32-1]. If x is out of range, fail and exit.
7751   if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0)
7752     {
7753       gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7754                    "We Can't do gd_to_le relaxation.\n"), r_type);
7755       return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7756     }
7757   Insntype newinsn;
7758   switch (r_type)
7759     {
7760     case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7761     case elfcpp::R_AARCH64_TLSDESC_CALL:
7762       // Change to nop
7763       newinsn = 0xd503201f;
7764       break;
7765
7766     case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7767       // Change to movz.
7768       newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5);
7769       break;
7770
7771     case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7772       // Change to movk.
7773       newinsn = 0xf2800000 | ((x & 0xffff) << 5);
7774       break;
7775
7776     default:
7777       gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7778                  r_type);
7779       gold_unreachable();
7780     }
7781   elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7782   return aarch64_reloc_funcs::STATUS_OKAY;
7783 }  // End of tls_desc_gd_to_le
7784
7785
7786 template<int size, bool big_endian>
7787 inline
7788 typename AArch64_relocate_functions<size, big_endian>::Status
7789 Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie(
7790              const Relocate_info<size, big_endian>* /* relinfo */,
7791              Target_aarch64<size, big_endian>* /* target */,
7792              const elfcpp::Rela<size, big_endian>& rela,
7793              unsigned int r_type,
7794              unsigned char* view,
7795              const Symbol_value<size>* /* psymval */,
7796              typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address,
7797              typename elfcpp::Elf_types<size>::Elf_Addr address)
7798 {
7799   typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7800   typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7801
7802   // TLSDESC-GD sequence is like:
7803   //   adrp  x0, :tlsdesc:v1
7804   //   ldr   x1, [x0, #:tlsdesc_lo12:v1]
7805   //   add   x0, x0, :tlsdesc_lo12:v1
7806   //   .tlsdesccall    v1
7807   //   blr   x1
7808   // After desc_gd_to_ie optimization, the sequence will be like:
7809   //   adrp  x0, :tlsie:v1
7810   //   ldr   x0, [x0, :tlsie_lo12:v1]
7811   //   nop
7812   //   nop
7813
7814   Insntype* ip = reinterpret_cast<Insntype*>(view);
7815   const elfcpp::Elf_Xword addend = rela.get_r_addend();
7816   Insntype newinsn;
7817   switch (r_type)
7818     {
7819     case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7820     case elfcpp::R_AARCH64_TLSDESC_CALL:
7821       // Change to nop
7822       newinsn = 0xd503201f;
7823       elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7824       break;
7825
7826     case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7827       {
7828         return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
7829                                          address);
7830       }
7831       break;
7832
7833     case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7834       {
7835        // Set ldr target register to be x0.
7836        Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
7837        insn &= 0xffffffe0;
7838        elfcpp::Swap<32, big_endian>::writeval(ip, insn);
7839        // Do relocation.
7840         const AArch64_reloc_property* reloc_property =
7841             aarch64_reloc_property_table->get_reloc_property(
7842               elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC);
7843         return aarch64_reloc_funcs::template rela_general<32>(
7844                  view, got_entry_address, addend, reloc_property);
7845       }
7846       break;
7847
7848     default:
7849       gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
7850                  r_type);
7851       gold_unreachable();
7852     }
7853   return aarch64_reloc_funcs::STATUS_OKAY;
7854 }  // End of tls_desc_gd_to_ie
7855
7856 // Relocate section data.
7857
7858 template<int size, bool big_endian>
7859 void
7860 Target_aarch64<size, big_endian>::relocate_section(
7861     const Relocate_info<size, big_endian>* relinfo,
7862     unsigned int sh_type,
7863     const unsigned char* prelocs,
7864     size_t reloc_count,
7865     Output_section* output_section,
7866     bool needs_special_offset_handling,
7867     unsigned char* view,
7868     typename elfcpp::Elf_types<size>::Elf_Addr address,
7869     section_size_type view_size,
7870     const Reloc_symbol_changes* reloc_symbol_changes)
7871 {
7872   gold_assert(sh_type == elfcpp::SHT_RELA);
7873   typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate;
7874   gold::relocate_section<size, big_endian, Target_aarch64, elfcpp::SHT_RELA,
7875                          AArch64_relocate, gold::Default_comdat_behavior>(
7876     relinfo,
7877     this,
7878     prelocs,
7879     reloc_count,
7880     output_section,
7881     needs_special_offset_handling,
7882     view,
7883     address,
7884     view_size,
7885     reloc_symbol_changes);
7886 }
7887
7888 // Return the size of a relocation while scanning during a relocatable
7889 // link.
7890
7891 template<int size, bool big_endian>
7892 unsigned int
7893 Target_aarch64<size, big_endian>::Relocatable_size_for_reloc::
7894 get_size_for_reloc(
7895     unsigned int ,
7896     Relobj* )
7897 {
7898   // We will never support SHT_REL relocations.
7899   gold_unreachable();
7900   return 0;
7901 }
7902
7903 // Scan the relocs during a relocatable link.
7904
7905 template<int size, bool big_endian>
7906 void
7907 Target_aarch64<size, big_endian>::scan_relocatable_relocs(
7908     Symbol_table* symtab,
7909     Layout* layout,
7910     Sized_relobj_file<size, big_endian>* object,
7911     unsigned int data_shndx,
7912     unsigned int sh_type,
7913     const unsigned char* prelocs,
7914     size_t reloc_count,
7915     Output_section* output_section,
7916     bool needs_special_offset_handling,
7917     size_t local_symbol_count,
7918     const unsigned char* plocal_symbols,
7919     Relocatable_relocs* rr)
7920 {
7921   gold_assert(sh_type == elfcpp::SHT_RELA);
7922
7923   typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
7924     Relocatable_size_for_reloc> Scan_relocatable_relocs;
7925
7926   gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
7927       Scan_relocatable_relocs>(
7928     symtab,
7929     layout,
7930     object,
7931     data_shndx,
7932     prelocs,
7933     reloc_count,
7934     output_section,
7935     needs_special_offset_handling,
7936     local_symbol_count,
7937     plocal_symbols,
7938     rr);
7939 }
7940
7941 // Relocate a section during a relocatable link.
7942
7943 template<int size, bool big_endian>
7944 void
7945 Target_aarch64<size, big_endian>::relocate_relocs(
7946     const Relocate_info<size, big_endian>* relinfo,
7947     unsigned int sh_type,
7948     const unsigned char* prelocs,
7949     size_t reloc_count,
7950     Output_section* output_section,
7951     typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
7952     const Relocatable_relocs* rr,
7953     unsigned char* view,
7954     typename elfcpp::Elf_types<size>::Elf_Addr view_address,
7955     section_size_type view_size,
7956     unsigned char* reloc_view,
7957     section_size_type reloc_view_size)
7958 {
7959   gold_assert(sh_type == elfcpp::SHT_RELA);
7960
7961   gold::relocate_relocs<size, big_endian, elfcpp::SHT_RELA>(
7962     relinfo,
7963     prelocs,
7964     reloc_count,
7965     output_section,
7966     offset_in_output_section,
7967     rr,
7968     view,
7969     view_address,
7970     view_size,
7971     reloc_view,
7972     reloc_view_size);
7973 }
7974
7975
7976 // Return whether this is a 3-insn erratum sequence.
7977
7978 template<int size, bool big_endian>
7979 bool
7980 Target_aarch64<size, big_endian>::is_erratum_843419_sequence(
7981     typename elfcpp::Swap<32,big_endian>::Valtype insn1,
7982     typename elfcpp::Swap<32,big_endian>::Valtype insn2,
7983     typename elfcpp::Swap<32,big_endian>::Valtype insn3)
7984 {
7985   unsigned rt1, rt2;
7986   bool load, pair;
7987
7988   // The 2nd insn is a single register load or store; or register pair
7989   // store.
7990   if (Insn_utilities::aarch64_mem_op_p(insn2, &rt1, &rt2, &pair, &load)
7991       && (!pair || (pair && !load)))
7992     {
7993       // The 3rd insn is a load or store instruction from the "Load/store
7994       // register (unsigned immediate)" encoding class, using Rn as the
7995       // base address register.
7996       if (Insn_utilities::aarch64_ldst_uimm(insn3)
7997           && (Insn_utilities::aarch64_rn(insn3)
7998               == Insn_utilities::aarch64_rd(insn1)))
7999         return true;
8000     }
8001   return false;
8002 }
8003
8004
8005 // Return whether this is a 835769 sequence.
8006 // (Similarly implemented as in elfnn-aarch64.c.)
8007
8008 template<int size, bool big_endian>
8009 bool
8010 Target_aarch64<size, big_endian>::is_erratum_835769_sequence(
8011     typename elfcpp::Swap<32,big_endian>::Valtype insn1,
8012     typename elfcpp::Swap<32,big_endian>::Valtype insn2)
8013 {
8014   uint32_t rt;
8015   uint32_t rt2;
8016   uint32_t rn;
8017   uint32_t rm;
8018   uint32_t ra;
8019   bool pair;
8020   bool load;
8021
8022   if (Insn_utilities::aarch64_mlxl(insn2)
8023       && Insn_utilities::aarch64_mem_op_p (insn1, &rt, &rt2, &pair, &load))
8024     {
8025       /* Any SIMD memory op is independent of the subsequent MLA
8026          by definition of the erratum.  */
8027       if (Insn_utilities::aarch64_bit(insn1, 26))
8028         return true;
8029
8030       /* If not SIMD, check for integer memory ops and MLA relationship.  */
8031       rn = Insn_utilities::aarch64_rn(insn2);
8032       ra = Insn_utilities::aarch64_ra(insn2);
8033       rm = Insn_utilities::aarch64_rm(insn2);
8034
8035       /* If this is a load and there's a true(RAW) dependency, we are safe
8036          and this is not an erratum sequence.  */
8037       if (load &&
8038           (rt == rn || rt == rm || rt == ra
8039            || (pair && (rt2 == rn || rt2 == rm || rt2 == ra))))
8040         return false;
8041
8042       /* We conservatively put out stubs for all other cases (including
8043          writebacks).  */
8044       return true;
8045     }
8046
8047   return false;
8048 }
8049
8050
8051 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8052
8053 template<int size, bool big_endian>
8054 void
8055 Target_aarch64<size, big_endian>::create_erratum_stub(
8056     AArch64_relobj<size, big_endian>* relobj,
8057     unsigned int shndx,
8058     section_size_type erratum_insn_offset,
8059     Address erratum_address,
8060     typename Insn_utilities::Insntype erratum_insn,
8061     int erratum_type,
8062     unsigned int e843419_adrp_offset)
8063 {
8064   gold_assert(erratum_type == ST_E_843419 || erratum_type == ST_E_835769);
8065   The_stub_table* stub_table = relobj->stub_table(shndx);
8066   gold_assert(stub_table != NULL);
8067   if (stub_table->find_erratum_stub(relobj,
8068                                     shndx,
8069                                     erratum_insn_offset) == NULL)
8070     {
8071       const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
8072       The_erratum_stub* stub;
8073       if (erratum_type == ST_E_835769)
8074         stub = new The_erratum_stub(relobj, erratum_type, shndx,
8075                                     erratum_insn_offset);
8076       else if (erratum_type == ST_E_843419)
8077         stub = new E843419_stub<size, big_endian>(
8078             relobj, shndx, erratum_insn_offset, e843419_adrp_offset);
8079       else
8080         gold_unreachable();
8081       stub->set_erratum_insn(erratum_insn);
8082       stub->set_erratum_address(erratum_address);
8083       // For erratum ST_E_843419 and ST_E_835769, the destination address is
8084       // always the next insn after erratum insn.
8085       stub->set_destination_address(erratum_address + BPI);
8086       stub_table->add_erratum_stub(stub);
8087     }
8088 }
8089
8090
8091 // Scan erratum for section SHNDX range [output_address + span_start,
8092 // output_address + span_end). Note here we do not share the code with
8093 // scan_erratum_843419_span function, because for 843419 we optimize by only
8094 // scanning the last few insns of a page, whereas for 835769, we need to scan
8095 // every insn.
8096
8097 template<int size, bool big_endian>
8098 void
8099 Target_aarch64<size, big_endian>::scan_erratum_835769_span(
8100     AArch64_relobj<size, big_endian>*  relobj,
8101     unsigned int shndx,
8102     const section_size_type span_start,
8103     const section_size_type span_end,
8104     unsigned char* input_view,
8105     Address output_address)
8106 {
8107   typedef typename Insn_utilities::Insntype Insntype;
8108
8109   const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
8110
8111   // Adjust output_address and view to the start of span.
8112   output_address += span_start;
8113   input_view += span_start;
8114
8115   section_size_type span_length = span_end - span_start;
8116   section_size_type offset = 0;
8117   for (offset = 0; offset + BPI < span_length; offset += BPI)
8118     {
8119       Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
8120       Insntype insn1 = ip[0];
8121       Insntype insn2 = ip[1];
8122       if (is_erratum_835769_sequence(insn1, insn2))
8123         {
8124           Insntype erratum_insn = insn2;
8125           // "span_start + offset" is the offset for insn1. So for insn2, it is
8126           // "span_start + offset + BPI".
8127           section_size_type erratum_insn_offset = span_start + offset + BPI;
8128           Address erratum_address = output_address + offset + BPI;
8129           gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8130                          "section %d, offset 0x%08x."),
8131                        relobj->name().c_str(), shndx,
8132                        (unsigned int)(span_start + offset));
8133
8134           this->create_erratum_stub(relobj, shndx,
8135                                     erratum_insn_offset, erratum_address,
8136                                     erratum_insn, ST_E_835769);
8137           offset += BPI;  // Skip mac insn.
8138         }
8139     }
8140 }  // End of "Target_aarch64::scan_erratum_835769_span".
8141
8142
8143 // Scan erratum for section SHNDX range
8144 // [output_address + span_start, output_address + span_end).
8145
8146 template<int size, bool big_endian>
8147 void
8148 Target_aarch64<size, big_endian>::scan_erratum_843419_span(
8149     AArch64_relobj<size, big_endian>*  relobj,
8150     unsigned int shndx,
8151     const section_size_type span_start,
8152     const section_size_type span_end,
8153     unsigned char* input_view,
8154     Address output_address)
8155 {
8156   typedef typename Insn_utilities::Insntype Insntype;
8157
8158   // Adjust output_address and view to the start of span.
8159   output_address += span_start;
8160   input_view += span_start;
8161
8162   if ((output_address & 0x03) != 0)
8163     return;
8164
8165   section_size_type offset = 0;
8166   section_size_type span_length = span_end - span_start;
8167   // The first instruction must be ending at 0xFF8 or 0xFFC.
8168   unsigned int page_offset = output_address & 0xFFF;
8169   // Make sure starting position, that is "output_address+offset",
8170   // starts at page position 0xff8 or 0xffc.
8171   if (page_offset < 0xff8)
8172     offset = 0xff8 - page_offset;
8173   while (offset + 3 * Insn_utilities::BYTES_PER_INSN <= span_length)
8174     {
8175       Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
8176       Insntype insn1 = ip[0];
8177       if (Insn_utilities::is_adrp(insn1))
8178         {
8179           Insntype insn2 = ip[1];
8180           Insntype insn3 = ip[2];
8181           Insntype erratum_insn;
8182           unsigned insn_offset;
8183           bool do_report = false;
8184           if (is_erratum_843419_sequence(insn1, insn2, insn3))
8185             {
8186               do_report = true;
8187               erratum_insn = insn3;
8188               insn_offset = 2 * Insn_utilities::BYTES_PER_INSN;
8189             }
8190           else if (offset + 4 * Insn_utilities::BYTES_PER_INSN <= span_length)
8191             {
8192               // Optionally we can have an insn between ins2 and ins3
8193               Insntype insn_opt = ip[2];
8194               // And insn_opt must not be a branch.
8195               if (!Insn_utilities::aarch64_b(insn_opt)
8196                   && !Insn_utilities::aarch64_bl(insn_opt)
8197                   && !Insn_utilities::aarch64_blr(insn_opt)
8198                   && !Insn_utilities::aarch64_br(insn_opt))
8199                 {
8200                   // And insn_opt must not write to dest reg in insn1. However
8201                   // we do a conservative scan, which means we may fix/report
8202                   // more than necessary, but it doesn't hurt.
8203
8204                   Insntype insn4 = ip[3];
8205                   if (is_erratum_843419_sequence(insn1, insn2, insn4))
8206                     {
8207                       do_report = true;
8208                       erratum_insn = insn4;
8209                       insn_offset = 3 * Insn_utilities::BYTES_PER_INSN;
8210                     }
8211                 }
8212             }
8213           if (do_report)
8214             {
8215               gold_info(_("Erratum 843419 found and fixed at \"%s\", "
8216                              "section %d, offset 0x%08x."),
8217                            relobj->name().c_str(), shndx,
8218                            (unsigned int)(span_start + offset));
8219               unsigned int erratum_insn_offset =
8220                 span_start + offset + insn_offset;
8221               Address erratum_address =
8222                 output_address + offset + insn_offset;
8223               create_erratum_stub(relobj, shndx,
8224                                   erratum_insn_offset, erratum_address,
8225                                   erratum_insn, ST_E_843419,
8226                                   span_start + offset);
8227             }
8228         }
8229
8230       // Advance to next candidate instruction. We only consider instruction
8231       // sequences starting at a page offset of 0xff8 or 0xffc.
8232       page_offset = (output_address + offset) & 0xfff;
8233       if (page_offset == 0xff8)
8234         offset += 4;
8235       else  // (page_offset == 0xffc), we move to next page's 0xff8.
8236         offset += 0xffc;
8237     }
8238 }  // End of "Target_aarch64::scan_erratum_843419_span".
8239
8240
8241 // The selector for aarch64 object files.
8242
8243 template<int size, bool big_endian>
8244 class Target_selector_aarch64 : public Target_selector
8245 {
8246  public:
8247   Target_selector_aarch64();
8248
8249   virtual Target*
8250   do_instantiate_target()
8251   { return new Target_aarch64<size, big_endian>(); }
8252 };
8253
8254 template<>
8255 Target_selector_aarch64<32, true>::Target_selector_aarch64()
8256   : Target_selector(elfcpp::EM_AARCH64, 32, true,
8257                     "elf32-bigaarch64", "aarch64_elf32_be_vec")
8258 { }
8259
8260 template<>
8261 Target_selector_aarch64<32, false>::Target_selector_aarch64()
8262   : Target_selector(elfcpp::EM_AARCH64, 32, false,
8263                     "elf32-littleaarch64", "aarch64_elf32_le_vec")
8264 { }
8265
8266 template<>
8267 Target_selector_aarch64<64, true>::Target_selector_aarch64()
8268   : Target_selector(elfcpp::EM_AARCH64, 64, true,
8269                     "elf64-bigaarch64", "aarch64_elf64_be_vec")
8270 { }
8271
8272 template<>
8273 Target_selector_aarch64<64, false>::Target_selector_aarch64()
8274   : Target_selector(elfcpp::EM_AARCH64, 64, false,
8275                     "elf64-littleaarch64", "aarch64_elf64_le_vec")
8276 { }
8277
8278 Target_selector_aarch64<32, true> target_selector_aarch64elf32b;
8279 Target_selector_aarch64<32, false> target_selector_aarch64elf32;
8280 Target_selector_aarch64<64, true> target_selector_aarch64elfb;
8281 Target_selector_aarch64<64, false> target_selector_aarch64elf;
8282
8283 } // End anonymous namespace.