bfd/elfxx-aarch64.c

   1 /* AArch64-specific support for ELF.
   2    Copyright (C) 2009-2018 Free Software Foundation, Inc.
   3    Contributed by ARM Ltd.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; see the file COPYING3. If not,
  19    see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "sysdep.h"
  22 #include "elfxx-aarch64.h"
  23 #include <stdarg.h>
  24 #include <string.h>
  25
  26 #define MASK(n) ((1u << (n)) - 1)
  27
  28 /* Sign-extend VALUE, which has the indicated number of BITS.  */
  29
  30 bfd_signed_vma
  31 _bfd_aarch64_sign_extend (bfd_vma value, int bits)
  32 {
  33   if (value & ((bfd_vma) 1 << (bits - 1)))
  34     /* VALUE is negative.  */
  35     value |= ((bfd_vma) - 1) << bits;
  36
  37   return value;
  38 }
  39
  40 /* Decode the IMM field of ADRP.  */
  41
  42 uint32_t
  43 _bfd_aarch64_decode_adrp_imm (uint32_t insn)
  44 {
  45   return (((insn >> 5) & MASK (19)) << 2) | ((insn >> 29) & MASK (2));
  46 }
  47
  48 /* Reencode the imm field of add immediate.  */
  49 static inline uint32_t
  50 reencode_add_imm (uint32_t insn, uint32_t imm)
  51 {
  52   return (insn & ~(MASK (12) << 10)) | ((imm & MASK (12)) << 10);
  53 }
  54
  55 /* Reencode the IMM field of ADR.  */
  56
  57 uint32_t
  58 _bfd_aarch64_reencode_adr_imm (uint32_t insn, uint32_t imm)
  59 {
  60   return (insn & ~((MASK (2) << 29) | (MASK (19) << 5)))
  61     | ((imm & MASK (2)) << 29) | ((imm & (MASK (19) << 2)) << 3);
  62 }
  63
  64 /* Reencode the imm field of ld/st pos immediate.  */
  65 static inline uint32_t
  66 reencode_ldst_pos_imm (uint32_t insn, uint32_t imm)
  67 {
  68   return (insn & ~(MASK (12) << 10)) | ((imm & MASK (12)) << 10);
  69 }
  70
  71 /* Encode the 26-bit offset of unconditional branch.  */
  72 static inline uint32_t
  73 reencode_branch_ofs_26 (uint32_t insn, uint32_t ofs)
  74 {
  75   return (insn & ~MASK (26)) | (ofs & MASK (26));
  76 }
  77
  78 /* Encode the 19-bit offset of conditional branch and compare & branch.  */
  79 static inline uint32_t
  80 reencode_cond_branch_ofs_19 (uint32_t insn, uint32_t ofs)
  81 {
  82   return (insn & ~(MASK (19) << 5)) | ((ofs & MASK (19)) << 5);
  83 }
  84
  85 /* Decode the 19-bit offset of load literal.  */
  86 static inline uint32_t
  87 reencode_ld_lit_ofs_19 (uint32_t insn, uint32_t ofs)
  88 {
  89   return (insn & ~(MASK (19) << 5)) | ((ofs & MASK (19)) << 5);
  90 }
  91
  92 /* Encode the 14-bit offset of test & branch.  */
  93 static inline uint32_t
  94 reencode_tst_branch_ofs_14 (uint32_t insn, uint32_t ofs)
  95 {
  96   return (insn & ~(MASK (14) << 5)) | ((ofs & MASK (14)) << 5);
  97 }
  98
  99 /* Reencode the imm field of move wide.  */
 100 static inline uint32_t
 101 reencode_movw_imm (uint32_t insn, uint32_t imm)
 102 {
 103   return (insn & ~(MASK (16) << 5)) | ((imm & MASK (16)) << 5);
 104 }
 105
 106 /* Reencode mov[zn] to movz.  */
 107 static inline uint32_t
 108 reencode_movzn_to_movz (uint32_t opcode)
 109 {
 110   return opcode | (1 << 30);
 111 }
 112
 113 /* Reencode mov[zn] to movn.  */
 114 static inline uint32_t
 115 reencode_movzn_to_movn (uint32_t opcode)
 116 {
 117   return opcode & ~(1 << 30);
 118 }
 119
 120 /* Return non-zero if the indicated VALUE has overflowed the maximum
 121    range expressible by a unsigned number with the indicated number of
 122    BITS.  */
 123
 124 static bfd_reloc_status_type
 125 aarch64_unsigned_overflow (bfd_vma value, unsigned int bits)
 126 {
 127   bfd_vma lim;
 128   if (bits >= sizeof (bfd_vma) * 8)
 129     return bfd_reloc_ok;
 130   lim = (bfd_vma) 1 << bits;
 131   if (value >= lim)
 132     return bfd_reloc_overflow;
 133   return bfd_reloc_ok;
 134 }
 135
 136 /* Return non-zero if the indicated VALUE has overflowed the maximum
 137    range expressible by an signed number with the indicated number of
 138    BITS.  */
 139
 140 static bfd_reloc_status_type
 141 aarch64_signed_overflow (bfd_vma value, unsigned int bits)
 142 {
 143   bfd_signed_vma svalue = (bfd_signed_vma) value;
 144   bfd_signed_vma lim;
 145
 146   if (bits >= sizeof (bfd_vma) * 8)
 147     return bfd_reloc_ok;
 148   lim = (bfd_signed_vma) 1 << (bits - 1);
 149   if (svalue < -lim || svalue >= lim)
 150     return bfd_reloc_overflow;
 151   return bfd_reloc_ok;
 152 }
 153
 154 /* Insert the addend/value into the instruction or data object being
 155    relocated.  */
 156 bfd_reloc_status_type
 157 _bfd_aarch64_elf_put_addend (bfd *abfd,
 158                              bfd_byte *address, bfd_reloc_code_real_type r_type,
 159                              reloc_howto_type *howto, bfd_signed_vma addend)
 160 {
 161   bfd_reloc_status_type status = bfd_reloc_ok;
 162   bfd_signed_vma old_addend = addend;
 163   bfd_vma contents;
 164   int size;
 165
 166   size = bfd_get_reloc_size (howto);
 167   switch (size)
 168     {
 169     case 0:
 170       return status;
 171     case 2:
 172       contents = bfd_get_16 (abfd, address);
 173       break;
 174     case 4:
 175       if (howto->src_mask != 0xffffffff)
 176         /* Must be 32-bit instruction, always little-endian.  */
 177         contents = bfd_getl32 (address);
 178       else
 179         /* Must be 32-bit data (endianness dependent).  */
 180         contents = bfd_get_32 (abfd, address);
 181       break;
 182     case 8:
 183       contents = bfd_get_64 (abfd, address);
 184       break;
 185     default:
 186       abort ();
 187     }
 188
 189   switch (howto->complain_on_overflow)
 190     {
 191     case complain_overflow_dont:
 192       break;
 193     case complain_overflow_signed:
 194       status = aarch64_signed_overflow (addend,
 195                                         howto->bitsize + howto->rightshift);
 196       break;
 197     case complain_overflow_unsigned:
 198       status = aarch64_unsigned_overflow (addend,
 199                                           howto->bitsize + howto->rightshift);
 200       break;
 201     case complain_overflow_bitfield:
 202     default:
 203       abort ();
 204     }
 205
 206   addend >>= howto->rightshift;
 207
 208   switch (r_type)
 209     {
 210     case BFD_RELOC_AARCH64_CALL26:
 211     case BFD_RELOC_AARCH64_JUMP26:
 212       contents = reencode_branch_ofs_26 (contents, addend);
 213       break;
 214
 215     case BFD_RELOC_AARCH64_BRANCH19:
 216       contents = reencode_cond_branch_ofs_19 (contents, addend);
 217       break;
 218
 219     case BFD_RELOC_AARCH64_TSTBR14:
 220       contents = reencode_tst_branch_ofs_14 (contents, addend);
 221       break;
 222
 223     case BFD_RELOC_AARCH64_GOT_LD_PREL19:
 224     case BFD_RELOC_AARCH64_LD_LO19_PCREL:
 225     case BFD_RELOC_AARCH64_TLSDESC_LD_PREL19:
 226     case BFD_RELOC_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
 227       if (old_addend & ((1 << howto->rightshift) - 1))
 228         return bfd_reloc_overflow;
 229       contents = reencode_ld_lit_ofs_19 (contents, addend);
 230       break;
 231
 232     case BFD_RELOC_AARCH64_TLSDESC_CALL:
 233       break;
 234
 235     case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
 236     case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
 237     case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
 238     case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
 239     case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
 240     case BFD_RELOC_AARCH64_TLSDESC_ADR_PREL21:
 241     case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
 242     case BFD_RELOC_AARCH64_TLSGD_ADR_PREL21:
 243     case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
 244     case BFD_RELOC_AARCH64_TLSLD_ADR_PAGE21:
 245     case BFD_RELOC_AARCH64_TLSLD_ADR_PREL21:
 246       contents = _bfd_aarch64_reencode_adr_imm (contents, addend);
 247       break;
 248
 249     case BFD_RELOC_AARCH64_ADD_LO12:
 250     case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12:
 251     case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
 252     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_HI12:
 253     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12:
 254     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
 255     case BFD_RELOC_AARCH64_TLSLD_ADD_LO12_NC:
 256     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
 257     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
 258     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
 259       /* Corresponds to: add rd, rn, #uimm12 to provide the low order
 260          12 bits of the page offset following
 261          BFD_RELOC_AARCH64_ADR_HI21_PCREL which computes the
 262          (pc-relative) page base.  */
 263       contents = reencode_add_imm (contents, addend);
 264       break;
 265
 266     case BFD_RELOC_AARCH64_LD32_GOTPAGE_LO14:
 267     case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
 268     case BFD_RELOC_AARCH64_LD64_GOTOFF_LO15:
 269     case BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15:
 270     case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
 271     case BFD_RELOC_AARCH64_LDST128_LO12:
 272     case BFD_RELOC_AARCH64_LDST16_LO12:
 273     case BFD_RELOC_AARCH64_LDST32_LO12:
 274     case BFD_RELOC_AARCH64_LDST64_LO12:
 275     case BFD_RELOC_AARCH64_LDST8_LO12:
 276     case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
 277     case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12:
 278     case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
 279     case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
 280     case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12:
 281     case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC:
 282     case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12:
 283     case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC:
 284     case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12:
 285     case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC:
 286     case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12:
 287     case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC:
 288     case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12:
 289     case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
 290     case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12:
 291     case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
 292     case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12:
 293     case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
 294     case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12:
 295     case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
 296       if (old_addend & ((1 << howto->rightshift) - 1))
 297         return bfd_reloc_overflow;
 298       /* Used for ldr*|str* rt, [rn, #uimm12] to provide the low order
 299          12 bits address offset.  */
 300       contents = reencode_ldst_pos_imm (contents, addend);
 301       break;
 302
 303       /* Group relocations to create high bits of a 16, 32, 48 or 64
 304          bit signed data or abs address inline. Will change
 305          instruction to MOVN or MOVZ depending on sign of calculated
 306          value.  */
 307
 308     case BFD_RELOC_AARCH64_MOVW_G0_S:
 309     case BFD_RELOC_AARCH64_MOVW_G1_S:
 310     case BFD_RELOC_AARCH64_MOVW_G2_S:
 311     case BFD_RELOC_AARCH64_MOVW_PREL_G0:
 312     case BFD_RELOC_AARCH64_MOVW_PREL_G1:
 313     case BFD_RELOC_AARCH64_MOVW_PREL_G2:
 314     case BFD_RELOC_AARCH64_MOVW_PREL_G3:
 315     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0:
 316     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1:
 317     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G2:
 318     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
 319     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
 320     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
 321       /* NOTE: We can only come here with movz or movn.  */
 322       if (addend < 0)
 323         {
 324           /* Force use of MOVN.  */
 325           addend = ~addend;
 326           contents = reencode_movzn_to_movn (contents);
 327         }
 328       else
 329         {
 330           /* Force use of MOVZ.  */
 331           contents = reencode_movzn_to_movz (contents);
 332         }
 333       /* Fall through.  */
 334
 335       /* Group relocations to create a 16, 32, 48 or 64 bit unsigned
 336          data or abs address inline.  */
 337
 338     case BFD_RELOC_AARCH64_MOVW_G0:
 339     case BFD_RELOC_AARCH64_MOVW_G0_NC:
 340     case BFD_RELOC_AARCH64_MOVW_G1:
 341     case BFD_RELOC_AARCH64_MOVW_G1_NC:
 342     case BFD_RELOC_AARCH64_MOVW_G2:
 343     case BFD_RELOC_AARCH64_MOVW_G2_NC:
 344     case BFD_RELOC_AARCH64_MOVW_G3:
 345     case BFD_RELOC_AARCH64_MOVW_GOTOFF_G0_NC:
 346     case BFD_RELOC_AARCH64_MOVW_GOTOFF_G1:
 347     case BFD_RELOC_AARCH64_MOVW_PREL_G0_NC:
 348     case BFD_RELOC_AARCH64_MOVW_PREL_G1_NC:
 349     case BFD_RELOC_AARCH64_MOVW_PREL_G2_NC:
 350     case BFD_RELOC_AARCH64_TLSDESC_OFF_G0_NC:
 351     case BFD_RELOC_AARCH64_TLSDESC_OFF_G1:
 352     case BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC:
 353     case BFD_RELOC_AARCH64_TLSGD_MOVW_G1:
 354     case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
 355     case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
 356     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
 357     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1_NC:
 358     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
 359     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
 360       contents = reencode_movw_imm (contents, addend);
 361       break;
 362
 363     default:
 364       /* Repack simple data */
 365       if (howto->dst_mask & (howto->dst_mask + 1))
 366         return bfd_reloc_notsupported;
 367
 368       contents = ((contents & ~howto->dst_mask) | (addend & howto->dst_mask));
 369       break;
 370     }
 371
 372   switch (size)
 373     {
 374     case 2:
 375       bfd_put_16 (abfd, contents, address);
 376       break;
 377     case 4:
 378       if (howto->dst_mask != 0xffffffff)
 379         /* must be 32-bit instruction, always little-endian */
 380         bfd_putl32 (contents, address);
 381       else
 382         /* must be 32-bit data (endianness dependent) */
 383         bfd_put_32 (abfd, contents, address);
 384       break;
 385     case 8:
 386       bfd_put_64 (abfd, contents, address);
 387       break;
 388     default:
 389       abort ();
 390     }
 391
 392   return status;
 393 }
 394
 395 bfd_vma
 396 _bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
 397                                      bfd_vma place, bfd_vma value,
 398                                      bfd_vma addend, bfd_boolean weak_undef_p)
 399 {
 400   switch (r_type)
 401     {
 402     case BFD_RELOC_AARCH64_NONE:
 403     case BFD_RELOC_AARCH64_TLSDESC_CALL:
 404       break;
 405
 406     case BFD_RELOC_AARCH64_16_PCREL:
 407     case BFD_RELOC_AARCH64_32_PCREL:
 408     case BFD_RELOC_AARCH64_64_PCREL:
 409     case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
 410     case BFD_RELOC_AARCH64_BRANCH19:
 411     case BFD_RELOC_AARCH64_LD_LO19_PCREL:
 412     case BFD_RELOC_AARCH64_MOVW_PREL_G0:
 413     case BFD_RELOC_AARCH64_MOVW_PREL_G0_NC:
 414     case BFD_RELOC_AARCH64_MOVW_PREL_G1:
 415     case BFD_RELOC_AARCH64_MOVW_PREL_G1_NC:
 416     case BFD_RELOC_AARCH64_MOVW_PREL_G2:
 417     case BFD_RELOC_AARCH64_MOVW_PREL_G2_NC:
 418     case BFD_RELOC_AARCH64_MOVW_PREL_G3:
 419     case BFD_RELOC_AARCH64_TLSDESC_ADR_PREL21:
 420     case BFD_RELOC_AARCH64_TLSDESC_LD_PREL19:
 421     case BFD_RELOC_AARCH64_TLSGD_ADR_PREL21:
 422     case BFD_RELOC_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
 423     case BFD_RELOC_AARCH64_TLSLD_ADR_PREL21:
 424     case BFD_RELOC_AARCH64_TSTBR14:
 425       if (weak_undef_p)
 426         value = place;
 427       value = value + addend - place;
 428       break;
 429
 430     case BFD_RELOC_AARCH64_CALL26:
 431     case BFD_RELOC_AARCH64_JUMP26:
 432       value = value + addend - place;
 433       break;
 434
 435     case BFD_RELOC_AARCH64_16:
 436     case BFD_RELOC_AARCH64_32:
 437     case BFD_RELOC_AARCH64_MOVW_G0:
 438     case BFD_RELOC_AARCH64_MOVW_G0_NC:
 439     case BFD_RELOC_AARCH64_MOVW_G0_S:
 440     case BFD_RELOC_AARCH64_MOVW_G1:
 441     case BFD_RELOC_AARCH64_MOVW_G1_NC:
 442     case BFD_RELOC_AARCH64_MOVW_G1_S:
 443     case BFD_RELOC_AARCH64_MOVW_G2:
 444     case BFD_RELOC_AARCH64_MOVW_G2_NC:
 445     case BFD_RELOC_AARCH64_MOVW_G2_S:
 446     case BFD_RELOC_AARCH64_MOVW_G3:
 447     case BFD_RELOC_AARCH64_TLSDESC_OFF_G0_NC:
 448     case BFD_RELOC_AARCH64_TLSDESC_OFF_G1:
 449     case BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC:
 450     case BFD_RELOC_AARCH64_TLSGD_MOVW_G1:
 451     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_HI12:
 452     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12:
 453     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
 454     case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12:
 455     case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC:
 456     case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12:
 457     case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC:
 458     case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12:
 459     case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC:
 460     case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12:
 461     case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC:
 462     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0:
 463     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
 464     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1:
 465     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1_NC:
 466     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G2:
 467     case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12:
 468     case BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12_NC:
 469     case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12:
 470     case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12_NC:
 471     case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12:
 472     case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12_NC:
 473     case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12:
 474     case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12_NC:
 475       value = value + addend;
 476       break;
 477
 478     case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
 479     case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
 480       if (weak_undef_p)
 481         value = PG (place);
 482       value = PG (value + addend) - PG (place);
 483       break;
 484
 485     case BFD_RELOC_AARCH64_GOT_LD_PREL19:
 486       value = value + addend - place;
 487       break;
 488
 489     case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
 490     case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
 491     case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
 492     case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
 493     case BFD_RELOC_AARCH64_TLSLD_ADR_PAGE21:
 494       value = PG (value + addend) - PG (place);
 495       break;
 496
 497     /* Caller must make sure addend is the base address of .got section.  */
 498     case BFD_RELOC_AARCH64_LD32_GOTPAGE_LO14:
 499     case BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15:
 500       addend = PG (addend);
 501       /* Fall through.  */
 502     case BFD_RELOC_AARCH64_LD64_GOTOFF_LO15:
 503     case BFD_RELOC_AARCH64_MOVW_GOTOFF_G0_NC:
 504     case BFD_RELOC_AARCH64_MOVW_GOTOFF_G1:
 505       value = value - addend;
 506       break;
 507
 508     case BFD_RELOC_AARCH64_ADD_LO12:
 509     case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
 510     case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
 511     case BFD_RELOC_AARCH64_LDST128_LO12:
 512     case BFD_RELOC_AARCH64_LDST16_LO12:
 513     case BFD_RELOC_AARCH64_LDST32_LO12:
 514     case BFD_RELOC_AARCH64_LDST64_LO12:
 515     case BFD_RELOC_AARCH64_LDST8_LO12:
 516     case BFD_RELOC_AARCH64_TLSDESC_ADD:
 517     case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12:
 518     case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
 519     case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12:
 520     case BFD_RELOC_AARCH64_TLSDESC_LDR:
 521     case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
 522     case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
 523     case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
 524     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
 525       value = PG_OFFSET (value + addend);
 526       break;
 527
 528     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
 529       value = value + addend;
 530       break;
 531
 532     case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
 533     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
 534     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
 535       value = (value + addend) & (bfd_vma) 0xffff0000;
 536       break;
 537     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
 538       /* Mask off low 12bits, keep all other high bits, so that the later
 539          generic code could check whehter there is overflow.  */
 540       value = (value + addend) & ~(bfd_vma) 0xfff;
 541       break;
 542
 543     case BFD_RELOC_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
 544     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
 545     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
 546       value = (value + addend) & (bfd_vma) 0xffff;
 547       break;
 548
 549     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
 550       value = (value + addend) & ~(bfd_vma) 0xffffffff;
 551       value -= place & ~(bfd_vma) 0xffffffff;
 552       break;
 553
 554     default:
 555       break;
 556     }
 557
 558   return value;
 559 }
 560
 561 /* Hook called by the linker routine which adds symbols from an object
 562    file.  */
 563
 564 bfd_boolean
 565 _bfd_aarch64_elf_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
 566                                   Elf_Internal_Sym *sym,
 567                                   const char **namep ATTRIBUTE_UNUSED,
 568                                   flagword *flagsp ATTRIBUTE_UNUSED,
 569                                   asection **secp ATTRIBUTE_UNUSED,
 570                                   bfd_vma *valp ATTRIBUTE_UNUSED)
 571 {
 572   if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 573       && (abfd->flags & DYNAMIC) == 0
 574       && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
 575     elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
 576
 577   return TRUE;
 578 }
 579
 580 /* Support for core dump NOTE sections.  */
 581
 582 bfd_boolean
 583 _bfd_aarch64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
 584 {
 585   int offset;
 586   size_t size;
 587
 588   switch (note->descsz)
 589     {
 590       default:
 591         return FALSE;
 592
 593       case 392:         /* sizeof(struct elf_prstatus) on Linux/arm64.  */
 594         /* pr_cursig */
 595         elf_tdata (abfd)->core->signal
 596           = bfd_get_16 (abfd, note->descdata + 12);
 597
 598         /* pr_pid */
 599         elf_tdata (abfd)->core->lwpid
 600           = bfd_get_32 (abfd, note->descdata + 32);
 601
 602         /* pr_reg */
 603         offset = 112;
 604         size = 272;
 605
 606         break;
 607     }
 608
 609   /* Make a ".reg/999" section.  */
 610   return _bfd_elfcore_make_pseudosection (abfd, ".reg",
 611                                           size, note->descpos + offset);
 612 }
 613
 614 bfd_boolean
 615 _bfd_aarch64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
 616 {
 617   switch (note->descsz)
 618     {
 619     default:
 620       return FALSE;
 621
 622     case 136:        /* This is sizeof(struct elf_prpsinfo) on Linux/aarch64.  */
 623       elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
 624       elf_tdata (abfd)->core->program
 625         = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
 626       elf_tdata (abfd)->core->command
 627         = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
 628     }
 629
 630   /* Note that for some reason, a spurious space is tacked
 631      onto the end of the args in some (at least one anyway)
 632      implementations, so strip it off if it exists.  */
 633
 634   {
 635     char *command = elf_tdata (abfd)->core->command;
 636     int n = strlen (command);
 637
 638     if (0 < n && command[n - 1] == ' ')
 639       command[n - 1] = '\0';
 640   }
 641
 642   return TRUE;
 643 }
 644
 645 char *
 646 _bfd_aarch64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type,
 647                                   ...)
 648 {
 649   switch (note_type)
 650     {
 651     default:
 652       return NULL;
 653
 654     case NT_PRPSINFO:
 655       {
 656         char data[136] ATTRIBUTE_NONSTRING;
 657         va_list ap;
 658
 659         va_start (ap, note_type);
 660         memset (data, 0, sizeof (data));
 661         strncpy (data + 40, va_arg (ap, const char *), 16);
 662         strncpy (data + 56, va_arg (ap, const char *), 80);
 663         va_end (ap);
 664
 665         return elfcore_write_note (abfd, buf, bufsiz, "CORE",
 666                                    note_type, data, sizeof (data));
 667       }
 668
 669     case NT_PRSTATUS:
 670       {
 671         char data[392];
 672         va_list ap;
 673         long pid;
 674         int cursig;
 675         const void *greg;
 676
 677         va_start (ap, note_type);
 678         memset (data, 0, sizeof (data));
 679         pid = va_arg (ap, long);
 680         bfd_put_32 (abfd, pid, data + 32);
 681         cursig = va_arg (ap, int);
 682         bfd_put_16 (abfd, cursig, data + 12);
 683         greg = va_arg (ap, const void *);
 684         memcpy (data + 112, greg, 272);
 685         va_end (ap);
 686
 687         return elfcore_write_note (abfd, buf, bufsiz, "CORE",
 688                                    note_type, data, sizeof (data));
 689       }
 690     }
 691 }