bfd/elfxx-aarch64.c

   1 /* AArch64-specific support for ELF.
   2    Copyright (C) 2009-2015 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_NC:
 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_NC:
 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       if (old_addend & ((1 << howto->rightshift) - 1))
 289         return bfd_reloc_overflow;
 290       /* Used for ldr*|str* rt, [rn, #uimm12] to provide the low order
 291          12 bits of the page offset following BFD_RELOC_AARCH64_ADR_HI21_PCREL
 292          which computes the (pc-relative) page base.  */
 293       contents = reencode_ldst_pos_imm (contents, addend);
 294       break;
 295
 296       /* Group relocations to create high bits of a 16, 32, 48 or 64
 297          bit signed data or abs address inline. Will change
 298          instruction to MOVN or MOVZ depending on sign of calculated
 299          value.  */
 300
 301     case BFD_RELOC_AARCH64_MOVW_G0_S:
 302     case BFD_RELOC_AARCH64_MOVW_G1_S:
 303     case BFD_RELOC_AARCH64_MOVW_G2_S:
 304     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0:
 305     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1:
 306     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G2:
 307     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
 308     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
 309     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
 310       /* NOTE: We can only come here with movz or movn.  */
 311       if (addend < 0)
 312         {
 313           /* Force use of MOVN.  */
 314           addend = ~addend;
 315           contents = reencode_movzn_to_movn (contents);
 316         }
 317       else
 318         {
 319           /* Force use of MOVZ.  */
 320           contents = reencode_movzn_to_movz (contents);
 321         }
 322       /* fall through */
 323
 324       /* Group relocations to create a 16, 32, 48 or 64 bit unsigned
 325          data or abs address inline.  */
 326
 327     case BFD_RELOC_AARCH64_MOVW_G0:
 328     case BFD_RELOC_AARCH64_MOVW_G0_NC:
 329     case BFD_RELOC_AARCH64_MOVW_G1:
 330     case BFD_RELOC_AARCH64_MOVW_G1_NC:
 331     case BFD_RELOC_AARCH64_MOVW_G2:
 332     case BFD_RELOC_AARCH64_MOVW_G2_NC:
 333     case BFD_RELOC_AARCH64_MOVW_G3:
 334     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
 335     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1_NC:
 336     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
 337     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
 338       contents = reencode_movw_imm (contents, addend);
 339       break;
 340
 341     default:
 342       /* Repack simple data */
 343       if (howto->dst_mask & (howto->dst_mask + 1))
 344         return bfd_reloc_notsupported;
 345
 346       contents = ((contents & ~howto->dst_mask) | (addend & howto->dst_mask));
 347       break;
 348     }
 349
 350   switch (size)
 351     {
 352     case 2:
 353       bfd_put_16 (abfd, contents, address);
 354       break;
 355     case 4:
 356       if (howto->dst_mask != 0xffffffff)
 357         /* must be 32-bit instruction, always little-endian */
 358         bfd_putl32 (contents, address);
 359       else
 360         /* must be 32-bit data (endianness dependent) */
 361         bfd_put_32 (abfd, contents, address);
 362       break;
 363     case 8:
 364       bfd_put_64 (abfd, contents, address);
 365       break;
 366     default:
 367       abort ();
 368     }
 369
 370   return status;
 371 }
 372
 373 bfd_vma
 374 _bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
 375                                      bfd_vma place, bfd_vma value,
 376                                      bfd_vma addend, bfd_boolean weak_undef_p)
 377 {
 378   switch (r_type)
 379     {
 380     case BFD_RELOC_AARCH64_NONE:
 381     case BFD_RELOC_AARCH64_TLSDESC_CALL:
 382       break;
 383
 384     case BFD_RELOC_AARCH64_16_PCREL:
 385     case BFD_RELOC_AARCH64_32_PCREL:
 386     case BFD_RELOC_AARCH64_64_PCREL:
 387     case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
 388     case BFD_RELOC_AARCH64_BRANCH19:
 389     case BFD_RELOC_AARCH64_LD_LO19_PCREL:
 390     case BFD_RELOC_AARCH64_TLSDESC_ADR_PREL21:
 391     case BFD_RELOC_AARCH64_TLSDESC_LD_PREL19:
 392     case BFD_RELOC_AARCH64_TLSGD_ADR_PREL21:
 393     case BFD_RELOC_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
 394     case BFD_RELOC_AARCH64_TLSLD_ADR_PREL21:
 395     case BFD_RELOC_AARCH64_TSTBR14:
 396       if (weak_undef_p)
 397         value = place;
 398       value = value + addend - place;
 399       break;
 400
 401     case BFD_RELOC_AARCH64_CALL26:
 402     case BFD_RELOC_AARCH64_JUMP26:
 403       value = value + addend - place;
 404       break;
 405
 406     case BFD_RELOC_AARCH64_16:
 407     case BFD_RELOC_AARCH64_32:
 408     case BFD_RELOC_AARCH64_LD64_GOTOFF_LO15:
 409     case BFD_RELOC_AARCH64_MOVW_G0:
 410     case BFD_RELOC_AARCH64_MOVW_G0_NC:
 411     case BFD_RELOC_AARCH64_MOVW_G0_S:
 412     case BFD_RELOC_AARCH64_MOVW_G1:
 413     case BFD_RELOC_AARCH64_MOVW_G1_NC:
 414     case BFD_RELOC_AARCH64_MOVW_G1_S:
 415     case BFD_RELOC_AARCH64_MOVW_G2:
 416     case BFD_RELOC_AARCH64_MOVW_G2_NC:
 417     case BFD_RELOC_AARCH64_MOVW_G2_S:
 418     case BFD_RELOC_AARCH64_MOVW_G3:
 419     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_HI12:
 420     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12:
 421     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
 422     case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12:
 423     case BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC:
 424     case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12:
 425     case BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC:
 426     case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12:
 427     case BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC:
 428     case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12:
 429     case BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC:
 430     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0:
 431     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
 432     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1:
 433     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G1_NC:
 434     case BFD_RELOC_AARCH64_TLSLD_MOVW_DTPREL_G2:
 435       value = value + addend;
 436       break;
 437
 438     case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
 439     case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
 440       if (weak_undef_p)
 441         value = PG (place);
 442       value = PG (value + addend) - PG (place);
 443       break;
 444
 445     case BFD_RELOC_AARCH64_GOT_LD_PREL19:
 446       value = value + addend - place;
 447       break;
 448
 449     case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
 450     case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
 451     case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
 452     case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
 453     case BFD_RELOC_AARCH64_TLSLD_ADR_PAGE21:
 454       value = PG (value + addend) - PG (place);
 455       break;
 456
 457     case BFD_RELOC_AARCH64_LD32_GOTPAGE_LO14:
 458     case BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15:
 459       /* Caller must make sure addend is the base address of .got section.  */
 460       value = value - PG (addend);
 461       break;
 462
 463     case BFD_RELOC_AARCH64_ADD_LO12:
 464     case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
 465     case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
 466     case BFD_RELOC_AARCH64_LDST128_LO12:
 467     case BFD_RELOC_AARCH64_LDST16_LO12:
 468     case BFD_RELOC_AARCH64_LDST32_LO12:
 469     case BFD_RELOC_AARCH64_LDST64_LO12:
 470     case BFD_RELOC_AARCH64_LDST8_LO12:
 471     case BFD_RELOC_AARCH64_TLSDESC_ADD:
 472     case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12_NC:
 473     case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
 474     case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12_NC:
 475     case BFD_RELOC_AARCH64_TLSDESC_LDR:
 476     case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
 477     case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
 478     case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
 479     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
 480       value = PG_OFFSET (value + addend);
 481       break;
 482
 483     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
 484       value = value + addend;
 485       break;
 486
 487     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
 488     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
 489       value = (value + addend) & (bfd_vma) 0xffff0000;
 490       break;
 491     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
 492       /* Mask off low 12bits, keep all other high bits, so that the later
 493          generic code could check whehter there is overflow.  */
 494       value = (value + addend) & ~(bfd_vma) 0xfff;
 495       break;
 496
 497     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
 498     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
 499       value = (value + addend) & (bfd_vma) 0xffff;
 500       break;
 501
 502     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
 503       value = (value + addend) & ~(bfd_vma) 0xffffffff;
 504       value -= place & ~(bfd_vma) 0xffffffff;
 505       break;
 506
 507     default:
 508       break;
 509     }
 510
 511   return value;
 512 }
 513
 514 /* Hook called by the linker routine which adds symbols from an object
 515    file.  */
 516
 517 bfd_boolean
 518 _bfd_aarch64_elf_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
 519                                   Elf_Internal_Sym *sym,
 520                                   const char **namep ATTRIBUTE_UNUSED,
 521                                   flagword *flagsp ATTRIBUTE_UNUSED,
 522                                   asection **secp ATTRIBUTE_UNUSED,
 523                                   bfd_vma *valp ATTRIBUTE_UNUSED)
 524 {
 525   if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 526        || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
 527       && (abfd->flags & DYNAMIC) == 0
 528       && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
 529     elf_tdata (info->output_bfd)->has_gnu_symbols = elf_gnu_symbol_any;
 530
 531   return TRUE;
 532 }
 533
 534 /* Support for core dump NOTE sections.  */
 535
 536 bfd_boolean
 537 _bfd_aarch64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
 538 {
 539   int offset;
 540   size_t size;
 541
 542   switch (note->descsz)
 543     {
 544       default:
 545         return FALSE;
 546
 547       case 392:         /* sizeof(struct elf_prstatus) on Linux/arm64.  */
 548         /* pr_cursig */
 549         elf_tdata (abfd)->core->signal
 550           = bfd_get_16 (abfd, note->descdata + 12);
 551
 552         /* pr_pid */
 553         elf_tdata (abfd)->core->lwpid
 554           = bfd_get_32 (abfd, note->descdata + 32);
 555
 556         /* pr_reg */
 557         offset = 112;
 558         size = 272;
 559
 560         break;
 561     }
 562
 563   /* Make a ".reg/999" section.  */
 564   return _bfd_elfcore_make_pseudosection (abfd, ".reg",
 565                                           size, note->descpos + offset);
 566 }
 567
 568 bfd_boolean
 569 _bfd_aarch64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
 570 {
 571   switch (note->descsz)
 572     {
 573     default:
 574       return FALSE;
 575
 576     case 136:        /* This is sizeof(struct elf_prpsinfo) on Linux/aarch64.  */
 577       elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
 578       elf_tdata (abfd)->core->program
 579         = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
 580       elf_tdata (abfd)->core->command
 581         = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
 582     }
 583
 584   /* Note that for some reason, a spurious space is tacked
 585      onto the end of the args in some (at least one anyway)
 586      implementations, so strip it off if it exists.  */
 587
 588   {
 589     char *command = elf_tdata (abfd)->core->command;
 590     int n = strlen (command);
 591
 592     if (0 < n && command[n - 1] == ' ')
 593       command[n - 1] = '\0';
 594   }
 595
 596   return TRUE;
 597 }
 598
 599 char *
 600 _bfd_aarch64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type,
 601                                   ...)
 602 {
 603   switch (note_type)
 604     {
 605     default:
 606       return NULL;
 607
 608     case NT_PRPSINFO:
 609       {
 610         char data[136];
 611         va_list ap;
 612
 613         va_start (ap, note_type);
 614         memset (data, 0, sizeof (data));
 615         strncpy (data + 40, va_arg (ap, const char *), 16);
 616         strncpy (data + 56, va_arg (ap, const char *), 80);
 617         va_end (ap);
 618
 619         return elfcore_write_note (abfd, buf, bufsiz, "CORE",
 620                                    note_type, data, sizeof (data));
 621       }
 622
 623     case NT_PRSTATUS:
 624       {
 625         char data[392];
 626         va_list ap;
 627         long pid;
 628         int cursig;
 629         const void *greg;
 630
 631         va_start (ap, note_type);
 632         memset (data, 0, sizeof (data));
 633         pid = va_arg (ap, long);
 634         bfd_put_32 (abfd, pid, data + 32);
 635         cursig = va_arg (ap, int);
 636         bfd_put_16 (abfd, cursig, data + 12);
 637         greg = va_arg (ap, const void *);
 638         memcpy (data + 112, greg, 272);
 639         va_end (ap);
 640
 641         return elfcore_write_note (abfd, buf, bufsiz, "CORE",
 642                                    note_type, data, sizeof (data));
 643       }
 644     }
 645 }