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_LO12:
 253     case BFD_RELOC_AARCH64_TLSLD_ADD_LO12_NC:
 254     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
 255     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
 256     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
 257       /* Corresponds to: add rd, rn, #uimm12 to provide the low order
 258          12 bits of the page offset following
 259          BFD_RELOC_AARCH64_ADR_HI21_PCREL which computes the
 260          (pc-relative) page base.  */
 261       contents = reencode_add_imm (contents, addend);
 262       break;
 263
 264     case BFD_RELOC_AARCH64_LD32_GOTPAGE_LO14:
 265     case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
 266     case BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15:
 267     case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
 268     case BFD_RELOC_AARCH64_LDST128_LO12:
 269     case BFD_RELOC_AARCH64_LDST16_LO12:
 270     case BFD_RELOC_AARCH64_LDST32_LO12:
 271     case BFD_RELOC_AARCH64_LDST64_LO12:
 272     case BFD_RELOC_AARCH64_LDST8_LO12:
 273     case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
 274     case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12_NC:
 275     case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
 276     case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
 277       if (old_addend & ((1 << howto->rightshift) - 1))
 278         return bfd_reloc_overflow;
 279       /* Used for ldr*|str* rt, [rn, #uimm12] to provide the low order
 280          12 bits of the page offset following BFD_RELOC_AARCH64_ADR_HI21_PCREL
 281          which computes the (pc-relative) page base.  */
 282       contents = reencode_ldst_pos_imm (contents, addend);
 283       break;
 284
 285       /* Group relocations to create high bits of a 16, 32, 48 or 64
 286          bit signed data or abs address inline. Will change
 287          instruction to MOVN or MOVZ depending on sign of calculated
 288          value.  */
 289
 290     case BFD_RELOC_AARCH64_MOVW_G0_S:
 291     case BFD_RELOC_AARCH64_MOVW_G1_S:
 292     case BFD_RELOC_AARCH64_MOVW_G2_S:
 293     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
 294     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
 295     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
 296       /* NOTE: We can only come here with movz or movn.  */
 297       if (addend < 0)
 298         {
 299           /* Force use of MOVN.  */
 300           addend = ~addend;
 301           contents = reencode_movzn_to_movn (contents);
 302         }
 303       else
 304         {
 305           /* Force use of MOVZ.  */
 306           contents = reencode_movzn_to_movz (contents);
 307         }
 308       /* fall through */
 309
 310       /* Group relocations to create a 16, 32, 48 or 64 bit unsigned
 311          data or abs address inline.  */
 312
 313     case BFD_RELOC_AARCH64_MOVW_G0:
 314     case BFD_RELOC_AARCH64_MOVW_G0_NC:
 315     case BFD_RELOC_AARCH64_MOVW_G1:
 316     case BFD_RELOC_AARCH64_MOVW_G1_NC:
 317     case BFD_RELOC_AARCH64_MOVW_G2:
 318     case BFD_RELOC_AARCH64_MOVW_G2_NC:
 319     case BFD_RELOC_AARCH64_MOVW_G3:
 320     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
 321     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
 322       contents = reencode_movw_imm (contents, addend);
 323       break;
 324
 325     default:
 326       /* Repack simple data */
 327       if (howto->dst_mask & (howto->dst_mask + 1))
 328         return bfd_reloc_notsupported;
 329
 330       contents = ((contents & ~howto->dst_mask) | (addend & howto->dst_mask));
 331       break;
 332     }
 333
 334   switch (size)
 335     {
 336     case 2:
 337       bfd_put_16 (abfd, contents, address);
 338       break;
 339     case 4:
 340       if (howto->dst_mask != 0xffffffff)
 341         /* must be 32-bit instruction, always little-endian */
 342         bfd_putl32 (contents, address);
 343       else
 344         /* must be 32-bit data (endianness dependent) */
 345         bfd_put_32 (abfd, contents, address);
 346       break;
 347     case 8:
 348       bfd_put_64 (abfd, contents, address);
 349       break;
 350     default:
 351       abort ();
 352     }
 353
 354   return status;
 355 }
 356
 357 bfd_vma
 358 _bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
 359                                      bfd_vma place, bfd_vma value,
 360                                      bfd_vma addend, bfd_boolean weak_undef_p)
 361 {
 362   switch (r_type)
 363     {
 364     case BFD_RELOC_AARCH64_NONE:
 365     case BFD_RELOC_AARCH64_TLSDESC_CALL:
 366       break;
 367
 368     case BFD_RELOC_AARCH64_16_PCREL:
 369     case BFD_RELOC_AARCH64_32_PCREL:
 370     case BFD_RELOC_AARCH64_64_PCREL:
 371     case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
 372     case BFD_RELOC_AARCH64_BRANCH19:
 373     case BFD_RELOC_AARCH64_LD_LO19_PCREL:
 374     case BFD_RELOC_AARCH64_TLSDESC_ADR_PREL21:
 375     case BFD_RELOC_AARCH64_TLSDESC_LD_PREL19:
 376     case BFD_RELOC_AARCH64_TLSGD_ADR_PREL21:
 377     case BFD_RELOC_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
 378     case BFD_RELOC_AARCH64_TLSLD_ADR_PREL21:
 379     case BFD_RELOC_AARCH64_TSTBR14:
 380       if (weak_undef_p)
 381         value = place;
 382       value = value + addend - place;
 383       break;
 384
 385     case BFD_RELOC_AARCH64_CALL26:
 386     case BFD_RELOC_AARCH64_JUMP26:
 387       value = value + addend - place;
 388       break;
 389
 390     case BFD_RELOC_AARCH64_16:
 391     case BFD_RELOC_AARCH64_32:
 392     case BFD_RELOC_AARCH64_MOVW_G0:
 393     case BFD_RELOC_AARCH64_MOVW_G0_NC:
 394     case BFD_RELOC_AARCH64_MOVW_G0_S:
 395     case BFD_RELOC_AARCH64_MOVW_G1:
 396     case BFD_RELOC_AARCH64_MOVW_G1_NC:
 397     case BFD_RELOC_AARCH64_MOVW_G1_S:
 398     case BFD_RELOC_AARCH64_MOVW_G2:
 399     case BFD_RELOC_AARCH64_MOVW_G2_NC:
 400     case BFD_RELOC_AARCH64_MOVW_G2_S:
 401     case BFD_RELOC_AARCH64_MOVW_G3:
 402     case BFD_RELOC_AARCH64_TLSLD_ADD_DTPREL_LO12:
 403       value = value + addend;
 404       break;
 405
 406     case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
 407     case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
 408       if (weak_undef_p)
 409         value = PG (place);
 410       value = PG (value + addend) - PG (place);
 411       break;
 412
 413     case BFD_RELOC_AARCH64_GOT_LD_PREL19:
 414       value = value + addend - place;
 415       break;
 416
 417     case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
 418     case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
 419     case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
 420     case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
 421     case BFD_RELOC_AARCH64_TLSLD_ADR_PAGE21:
 422       value = PG (value + addend) - PG (place);
 423       break;
 424
 425     case BFD_RELOC_AARCH64_LD32_GOTPAGE_LO14:
 426     case BFD_RELOC_AARCH64_LD64_GOTPAGE_LO15:
 427       /* Caller must make sure addend is the base address of .got section.  */
 428       value = value - PG (addend);
 429       break;
 430
 431     case BFD_RELOC_AARCH64_ADD_LO12:
 432     case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
 433     case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
 434     case BFD_RELOC_AARCH64_LDST128_LO12:
 435     case BFD_RELOC_AARCH64_LDST16_LO12:
 436     case BFD_RELOC_AARCH64_LDST32_LO12:
 437     case BFD_RELOC_AARCH64_LDST64_LO12:
 438     case BFD_RELOC_AARCH64_LDST8_LO12:
 439     case BFD_RELOC_AARCH64_TLSDESC_ADD:
 440     case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12_NC:
 441     case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
 442     case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12_NC:
 443     case BFD_RELOC_AARCH64_TLSDESC_LDR:
 444     case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
 445     case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
 446     case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
 447     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
 448       value = PG_OFFSET (value + addend);
 449       break;
 450
 451     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
 452       value = value + addend;
 453       break;
 454
 455     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
 456     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
 457       value = (value + addend) & (bfd_vma) 0xffff0000;
 458       break;
 459     case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
 460       /* Mask off low 12bits, keep all other high bits, so that the later
 461          generic code could check whehter there is overflow.  */
 462       value = (value + addend) & ~(bfd_vma) 0xfff;
 463       break;
 464
 465     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
 466     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
 467       value = (value + addend) & (bfd_vma) 0xffff;
 468       break;
 469
 470     case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
 471       value = (value + addend) & ~(bfd_vma) 0xffffffff;
 472       value -= place & ~(bfd_vma) 0xffffffff;
 473       break;
 474
 475     default:
 476       break;
 477     }
 478
 479   return value;
 480 }
 481
 482 /* Hook called by the linker routine which adds symbols from an object
 483    file.  */
 484
 485 bfd_boolean
 486 _bfd_aarch64_elf_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
 487                                   Elf_Internal_Sym *sym,
 488                                   const char **namep ATTRIBUTE_UNUSED,
 489                                   flagword *flagsp ATTRIBUTE_UNUSED,
 490                                   asection **secp ATTRIBUTE_UNUSED,
 491                                   bfd_vma *valp ATTRIBUTE_UNUSED)
 492 {
 493   if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 494        || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
 495       && (abfd->flags & DYNAMIC) == 0
 496       && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
 497     elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
 498
 499   return TRUE;
 500 }
 501
 502 /* Support for core dump NOTE sections.  */
 503
 504 bfd_boolean
 505 _bfd_aarch64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
 506 {
 507   int offset;
 508   size_t size;
 509
 510   switch (note->descsz)
 511     {
 512       default:
 513         return FALSE;
 514
 515       case 392:         /* sizeof(struct elf_prstatus) on Linux/arm64.  */
 516         /* pr_cursig */
 517         elf_tdata (abfd)->core->signal
 518           = bfd_get_16 (abfd, note->descdata + 12);
 519
 520         /* pr_pid */
 521         elf_tdata (abfd)->core->lwpid
 522           = bfd_get_32 (abfd, note->descdata + 32);
 523
 524         /* pr_reg */
 525         offset = 112;
 526         size = 272;
 527
 528         break;
 529     }
 530
 531   /* Make a ".reg/999" section.  */
 532   return _bfd_elfcore_make_pseudosection (abfd, ".reg",
 533                                           size, note->descpos + offset);
 534 }
 535
 536 bfd_boolean
 537 _bfd_aarch64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
 538 {
 539   switch (note->descsz)
 540     {
 541     default:
 542       return FALSE;
 543
 544     case 136:        /* This is sizeof(struct elf_prpsinfo) on Linux/aarch64.  */
 545       elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 24);
 546       elf_tdata (abfd)->core->program
 547         = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
 548       elf_tdata (abfd)->core->command
 549         = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
 550     }
 551
 552   /* Note that for some reason, a spurious space is tacked
 553      onto the end of the args in some (at least one anyway)
 554      implementations, so strip it off if it exists.  */
 555
 556   {
 557     char *command = elf_tdata (abfd)->core->command;
 558     int n = strlen (command);
 559
 560     if (0 < n && command[n - 1] == ' ')
 561       command[n - 1] = '\0';
 562   }
 563
 564   return TRUE;
 565 }
 566
 567 char *
 568 _bfd_aarch64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type,
 569                                   ...)
 570 {
 571   switch (note_type)
 572     {
 573     default:
 574       return NULL;
 575
 576     case NT_PRPSINFO:
 577       {
 578         char data[136];
 579         va_list ap;
 580
 581         va_start (ap, note_type);
 582         memset (data, 0, sizeof (data));
 583         strncpy (data + 40, va_arg (ap, const char *), 16);
 584         strncpy (data + 56, va_arg (ap, const char *), 80);
 585         va_end (ap);
 586
 587         return elfcore_write_note (abfd, buf, bufsiz, "CORE",
 588                                    note_type, data, sizeof (data));
 589       }
 590
 591     case NT_PRSTATUS:
 592       {
 593         char data[392];
 594         va_list ap;
 595         long pid;
 596         int cursig;
 597         const void *greg;
 598
 599         va_start (ap, note_type);
 600         memset (data, 0, sizeof (data));
 601         pid = va_arg (ap, long);
 602         bfd_put_32 (abfd, pid, data + 32);
 603         cursig = va_arg (ap, int);
 604         bfd_put_16 (abfd, cursig, data + 12);
 605         greg = va_arg (ap, const void *);
 606         memcpy (data + 112, greg, 272);
 607         va_end (ap);
 608
 609         return elfcore_write_note (abfd, buf, bufsiz, "CORE",
 610                                    note_type, data, sizeof (data));
 611       }
 612     }
 613 }