bfd/coff-x86_64.c

   1 /* BFD back-end for AMD 64 COFF files.
   2    Copyright (C) 2006-2015 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.
  20
  21    Written by Kai Tietz, OneVision Software GmbH&CoKg.  */
  22
  23 #ifndef COFF_WITH_pex64
  24 #define COFF_WITH_pex64
  25 #endif
  26
  27 /* Note we have to make sure not to include headers twice.
  28    Not all headers are wrapped in #ifdef guards, so we define
  29    PEI_HEADERS to prevent double including here.  */
  30 #ifndef PEI_HEADERS
  31 #include "sysdep.h"
  32 #include "bfd.h"
  33 #include "libbfd.h"
  34 #include "coff/x86_64.h"
  35 #include "coff/internal.h"
  36 #include "coff/pe.h"
  37 #include "libcoff.h"
  38 #include "libiberty.h"
  39 #endif
  40
  41 #define BADMAG(x) AMD64BADMAG(x)
  42
  43 #ifdef COFF_WITH_pex64
  44 # undef  AOUTSZ
  45 # define AOUTSZ         PEPAOUTSZ
  46 # define PEAOUTHDR      PEPAOUTHDR
  47 #endif
  48
  49 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
  50
  51 /* The page size is a guess based on ELF.  */
  52
  53 #define COFF_PAGE_SIZE 0x1000
  54
  55 /* For some reason when using AMD COFF the value stored in the .text
  56    section for a reference to a common symbol is the value itself plus
  57    any desired offset.  Ian Taylor, Cygnus Support.  */
  58
  59 /* If we are producing relocatable output, we need to do some
  60    adjustments to the object file that are not done by the
  61    bfd_perform_relocation function.  This function is called by every
  62    reloc type to make any required adjustments.  */
  63
  64 static bfd_reloc_status_type
  65 coff_amd64_reloc (bfd *abfd,
  66                   arelent *reloc_entry,
  67                   asymbol *symbol,
  68                   void * data,
  69                   asection *input_section ATTRIBUTE_UNUSED,
  70                   bfd *output_bfd,
  71                   char **error_message ATTRIBUTE_UNUSED)
  72 {
  73   symvalue diff;
  74
  75 #if !defined(COFF_WITH_PE)
  76   if (output_bfd == NULL)
  77     return bfd_reloc_continue;
  78 #endif
  79
  80   if (bfd_is_com_section (symbol->section))
  81     {
  82 #if !defined(COFF_WITH_PE)
  83       /* We are relocating a common symbol.  The current value in the
  84          object file is ORIG + OFFSET, where ORIG is the value of the
  85          common symbol as seen by the object file when it was compiled
  86          (this may be zero if the symbol was undefined) and OFFSET is
  87          the offset into the common symbol (normally zero, but may be
  88          non-zero when referring to a field in a common structure).
  89          ORIG is the negative of reloc_entry->addend, which is set by
  90          the CALC_ADDEND macro below.  We want to replace the value in
  91          the object file with NEW + OFFSET, where NEW is the value of
  92          the common symbol which we are going to put in the final
  93          object file.  NEW is symbol->value.  */
  94       diff = symbol->value + reloc_entry->addend;
  95 #else
  96       /* In PE mode, we do not offset the common symbol.  */
  97       diff = reloc_entry->addend;
  98 #endif
  99     }
 100   else
 101     {
 102       /* For some reason bfd_perform_relocation always effectively
 103          ignores the addend for a COFF target when producing
 104          relocatable output.  This seems to be always wrong for 386
 105          COFF, so we handle the addend here instead.  */
 106 #if defined(COFF_WITH_PE)
 107       if (output_bfd == NULL)
 108         {
 109           reloc_howto_type *howto = reloc_entry->howto;
 110
 111           /* Although PC relative relocations are very similar between
 112              PE and non-PE formats, but they are off by 1 << howto->size
 113              bytes. For the external relocation, PE is very different
 114              from others. See md_apply_fix3 () in gas/config/tc-amd64.c.
 115              When we link PE and non-PE object files together to
 116              generate a non-PE executable, we have to compensate it
 117              here.  */
 118           if(howto->pc_relative && howto->pcrel_offset)
 119             diff = -(1 << howto->size);
 120           else if(symbol->flags & BSF_WEAK)
 121             diff = reloc_entry->addend - symbol->value;
 122           else
 123             diff = -reloc_entry->addend;
 124         }
 125       else
 126 #endif
 127         diff = reloc_entry->addend;
 128     }
 129
 130 #if defined(COFF_WITH_PE)
 131   /* FIXME: How should this case be handled?  */
 132   if (reloc_entry->howto->type == R_AMD64_IMAGEBASE
 133       && output_bfd != NULL
 134       && bfd_get_flavour (output_bfd) == bfd_target_coff_flavour)
 135     diff -= pe_data (output_bfd)->pe_opthdr.ImageBase;
 136 #endif
 137
 138 #define DOIT(x) \
 139   x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
 140
 141     if (diff != 0)
 142       {
 143         reloc_howto_type *howto = reloc_entry->howto;
 144         unsigned char *addr = (unsigned char *) data + reloc_entry->address;
 145
 146         /* FIXME: We do not have an end address for data, so we cannot
 147            accurately range check any addresses computed against it.
 148            cf: PR binutils/17512: file: 1085-1761-0.004.
 149            For now we do the best that we can.  */
 150         if (addr < (unsigned char *) data || addr > ((unsigned char *) data) + input_section->size)
 151           {
 152             bfd_set_error (bfd_error_bad_value);
 153             return bfd_reloc_notsupported;
 154           }
 155
 156         switch (howto->size)
 157           {
 158           case 0:
 159             {
 160               char x = bfd_get_8 (abfd, addr);
 161               DOIT (x);
 162               bfd_put_8 (abfd, x, addr);
 163             }
 164             break;
 165
 166           case 1:
 167             {
 168               short x = bfd_get_16 (abfd, addr);
 169               DOIT (x);
 170               bfd_put_16 (abfd, (bfd_vma) x, addr);
 171             }
 172             break;
 173
 174           case 2:
 175             {
 176               long x = bfd_get_32 (abfd, addr);
 177               DOIT (x);
 178               bfd_put_32 (abfd, (bfd_vma) x, addr);
 179             }
 180             break;
 181           case 4:
 182             {
 183               long long x = bfd_get_64 (abfd, addr);
 184               DOIT (x);
 185               bfd_put_64 (abfd, (bfd_vma) x, addr);
 186             }
 187             break;
 188
 189           default:
 190             bfd_set_error (bfd_error_bad_value);
 191             return bfd_reloc_notsupported;
 192           }
 193       }
 194
 195   /* Now let bfd_perform_relocation finish everything up.  */
 196   return bfd_reloc_continue;
 197 }
 198
 199 #if defined(COFF_WITH_PE)
 200 /* Return TRUE if this relocation should appear in the output .reloc
 201    section.  */
 202
 203 static bfd_boolean
 204 in_reloc_p (bfd *abfd ATTRIBUTE_UNUSED, reloc_howto_type *howto)
 205 {
 206   return ! howto->pc_relative && howto->type != R_AMD64_IMAGEBASE
 207          && howto->type != R_AMD64_SECREL;
 208 }
 209 #endif /* COFF_WITH_PE */
 210
 211 #ifndef PCRELOFFSET
 212 #define PCRELOFFSET TRUE
 213 #endif
 214
 215 static reloc_howto_type howto_table[] =
 216 {
 217   EMPTY_HOWTO (0),
 218   HOWTO (R_AMD64_DIR64,         /* type  1*/
 219          0,                     /* rightshift */
 220          4,                     /* size (0 = byte, 1 = short, 2 = long, 4 = long long) */
 221          64,                    /* bitsize */
 222          FALSE,                 /* pc_relative */
 223          0,                     /* bitpos */
 224          complain_overflow_bitfield, /* complain_on_overflow */
 225          coff_amd64_reloc,      /* special_function */
 226          "R_X86_64_64",         /* name */
 227          TRUE,                  /* partial_inplace */
 228          0xffffffffffffffffll,  /* src_mask */
 229          0xffffffffffffffffll,  /* dst_mask */
 230          TRUE),                 /* pcrel_offset */
 231   HOWTO (R_AMD64_DIR32,         /* type 2 */
 232          0,                     /* rightshift */
 233          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 234          32,                    /* bitsize */
 235          FALSE,                 /* pc_relative */
 236          0,                     /* bitpos */
 237          complain_overflow_bitfield, /* complain_on_overflow */
 238          coff_amd64_reloc,      /* special_function */
 239          "R_X86_64_32",         /* name */
 240          TRUE,                  /* partial_inplace */
 241          0xffffffff,            /* src_mask */
 242          0xffffffff,            /* dst_mask */
 243          TRUE),                 /* pcrel_offset */
 244   /* PE IMAGE_REL_AMD64_ADDR32NB relocation (3).        */
 245   HOWTO (R_AMD64_IMAGEBASE,     /* type */
 246          0,                     /* rightshift */
 247          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 248          32,                    /* bitsize */
 249          FALSE,                 /* pc_relative */
 250          0,                     /* bitpos */
 251          complain_overflow_bitfield, /* complain_on_overflow */
 252          coff_amd64_reloc,      /* special_function */
 253          "rva32",               /* name */
 254          TRUE,                  /* partial_inplace */
 255          0xffffffff,            /* src_mask */
 256          0xffffffff,            /* dst_mask */
 257          FALSE),                /* pcrel_offset */
 258   /* 32-bit longword PC relative relocation (4).  */
 259   HOWTO (R_AMD64_PCRLONG,       /* type 4 */
 260          0,                     /* rightshift */
 261          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 262          32,                    /* bitsize */
 263          TRUE,                  /* pc_relative */
 264          0,                     /* bitpos */
 265          complain_overflow_signed, /* complain_on_overflow */
 266          coff_amd64_reloc,      /* special_function */
 267          "R_X86_64_PC32",       /* name */
 268          TRUE,                  /* partial_inplace */
 269          0xffffffff,            /* src_mask */
 270          0xffffffff,            /* dst_mask */
 271          PCRELOFFSET),          /* pcrel_offset */
 272
 273  HOWTO (R_AMD64_PCRLONG_1,      /* type 5 */
 274          0,                     /* rightshift */
 275          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 276          32,                    /* bitsize */
 277          TRUE,                  /* pc_relative */
 278          0,                     /* bitpos */
 279          complain_overflow_signed, /* complain_on_overflow */
 280          coff_amd64_reloc,      /* special_function */
 281          "DISP32+1",            /* name */
 282          TRUE,                  /* partial_inplace */
 283          0xffffffff,            /* src_mask */
 284          0xffffffff,            /* dst_mask */
 285          PCRELOFFSET),          /* pcrel_offset */
 286  HOWTO (R_AMD64_PCRLONG_2,      /* type 6 */
 287          0,                     /* rightshift */
 288          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 289          32,                    /* bitsize */
 290          TRUE,                  /* pc_relative */
 291          0,                     /* bitpos */
 292          complain_overflow_signed, /* complain_on_overflow */
 293          coff_amd64_reloc,      /* special_function */
 294          "DISP32+2",            /* name */
 295          TRUE,                  /* partial_inplace */
 296          0xffffffff,            /* src_mask */
 297          0xffffffff,            /* dst_mask */
 298          PCRELOFFSET),          /* pcrel_offset */
 299  HOWTO (R_AMD64_PCRLONG_3,      /* type 7 */
 300          0,                     /* rightshift */
 301          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 302          32,                    /* bitsize */
 303          TRUE,                  /* pc_relative */
 304          0,                     /* bitpos */
 305          complain_overflow_signed, /* complain_on_overflow */
 306          coff_amd64_reloc,      /* special_function */
 307          "DISP32+3",            /* name */
 308          TRUE,                  /* partial_inplace */
 309          0xffffffff,            /* src_mask */
 310          0xffffffff,            /* dst_mask */
 311          PCRELOFFSET),          /* pcrel_offset */
 312  HOWTO (R_AMD64_PCRLONG_4,      /* type 8 */
 313          0,                     /* rightshift */
 314          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 315          32,                    /* bitsize */
 316          TRUE,                  /* pc_relative */
 317          0,                     /* bitpos */
 318          complain_overflow_signed, /* complain_on_overflow */
 319          coff_amd64_reloc,      /* special_function */
 320          "DISP32+4",            /* name */
 321          TRUE,                  /* partial_inplace */
 322          0xffffffff,            /* src_mask */
 323          0xffffffff,            /* dst_mask */
 324          PCRELOFFSET),          /* pcrel_offset */
 325  HOWTO (R_AMD64_PCRLONG_5,      /* type 9 */
 326          0,                     /* rightshift */
 327          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 328          32,                    /* bitsize */
 329          TRUE,                  /* pc_relative */
 330          0,                     /* bitpos */
 331          complain_overflow_signed, /* complain_on_overflow */
 332          coff_amd64_reloc,      /* special_function */
 333          "DISP32+5",            /* name */
 334          TRUE,                  /* partial_inplace */
 335          0xffffffff,            /* src_mask */
 336          0xffffffff,            /* dst_mask */
 337          PCRELOFFSET),          /* pcrel_offset */
 338   EMPTY_HOWTO (10), /* R_AMD64_SECTION 10  */
 339 #if defined(COFF_WITH_PE)
 340   /* 32-bit longword section relative relocation (11).  */
 341   HOWTO (R_AMD64_SECREL,        /* type */
 342          0,                     /* rightshift */
 343          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 344          32,                    /* bitsize */
 345          FALSE,                 /* pc_relative */
 346          0,                     /* bitpos */
 347          complain_overflow_bitfield, /* complain_on_overflow */
 348          coff_amd64_reloc,      /* special_function */
 349          "secrel32",            /* name */
 350          TRUE,                  /* partial_inplace */
 351          0xffffffff,            /* src_mask */
 352          0xffffffff,            /* dst_mask */
 353          TRUE),                 /* pcrel_offset */
 354 #else
 355   EMPTY_HOWTO (11),
 356 #endif
 357   EMPTY_HOWTO (12),
 358   EMPTY_HOWTO (13),
 359 #ifndef DONT_EXTEND_AMD64
 360   HOWTO (R_AMD64_PCRQUAD,
 361          0,                     /* rightshift */
 362          4,                     /* size (0 = byte, 1 = short, 2 = long) */
 363          64,                    /* bitsize */
 364          TRUE,                  /* pc_relative */
 365          0,                     /* bitpos */
 366          complain_overflow_signed, /* complain_on_overflow */
 367          coff_amd64_reloc,      /* special_function */
 368          "R_X86_64_PC64",       /* name */
 369          TRUE,                  /* partial_inplace */
 370          0xffffffffffffffffll,  /* src_mask */
 371          0xffffffffffffffffll,  /* dst_mask */
 372          PCRELOFFSET),           /* pcrel_offset */
 373 #else
 374   EMPTY_HOWTO (14),
 375 #endif
 376   /* Byte relocation (15).  */
 377   HOWTO (R_RELBYTE,             /* type */
 378          0,                     /* rightshift */
 379          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 380          8,                     /* bitsize */
 381          FALSE,                 /* pc_relative */
 382          0,                     /* bitpos */
 383          complain_overflow_bitfield, /* complain_on_overflow */
 384          coff_amd64_reloc,      /* special_function */
 385          "R_X86_64_8",          /* name */
 386          TRUE,                  /* partial_inplace */
 387          0x000000ff,            /* src_mask */
 388          0x000000ff,            /* dst_mask */
 389          PCRELOFFSET),          /* pcrel_offset */
 390   /* 16-bit word relocation (16).  */
 391   HOWTO (R_RELWORD,             /* type */
 392          0,                     /* rightshift */
 393          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 394          16,                    /* bitsize */
 395          FALSE,                 /* pc_relative */
 396          0,                     /* bitpos */
 397          complain_overflow_bitfield, /* complain_on_overflow */
 398          coff_amd64_reloc,      /* special_function */
 399          "R_X86_64_16",         /* name */
 400          TRUE,                  /* partial_inplace */
 401          0x0000ffff,            /* src_mask */
 402          0x0000ffff,            /* dst_mask */
 403          PCRELOFFSET),          /* pcrel_offset */
 404   /* 32-bit longword relocation (17).   */
 405   HOWTO (R_RELLONG,             /* type */
 406          0,                     /* rightshift */
 407          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 408          32,                    /* bitsize */
 409          FALSE,                 /* pc_relative */
 410          0,                     /* bitpos */
 411          complain_overflow_bitfield, /* complain_on_overflow */
 412          coff_amd64_reloc,      /* special_function */
 413          "R_X86_64_32S",        /* name */
 414          TRUE,                  /* partial_inplace */
 415          0xffffffff,            /* src_mask */
 416          0xffffffff,            /* dst_mask */
 417          PCRELOFFSET),          /* pcrel_offset */
 418   /* Byte PC relative relocation (18).   */
 419   HOWTO (R_PCRBYTE,             /* type */
 420          0,                     /* rightshift */
 421          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 422          8,                     /* bitsize */
 423          TRUE,                  /* pc_relative */
 424          0,                     /* bitpos */
 425          complain_overflow_signed, /* complain_on_overflow */
 426          coff_amd64_reloc,      /* special_function */
 427          "R_X86_64_PC8",        /* name */
 428          TRUE,                  /* partial_inplace */
 429          0x000000ff,            /* src_mask */
 430          0x000000ff,            /* dst_mask */
 431          PCRELOFFSET),          /* pcrel_offset */
 432   /* 16-bit word PC relative relocation (19).   */
 433   HOWTO (R_PCRWORD,             /* type */
 434          0,                     /* rightshift */
 435          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 436          16,                    /* bitsize */
 437          TRUE,                  /* pc_relative */
 438          0,                     /* bitpos */
 439          complain_overflow_signed, /* complain_on_overflow */
 440          coff_amd64_reloc,      /* special_function */
 441          "R_X86_64_PC16",       /* name */
 442          TRUE,                  /* partial_inplace */
 443          0x0000ffff,            /* src_mask */
 444          0x0000ffff,            /* dst_mask */
 445          PCRELOFFSET),          /* pcrel_offset */
 446   /* 32-bit longword PC relative relocation (20).  */
 447   HOWTO (R_PCRLONG,             /* type */
 448          0,                     /* rightshift */
 449          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 450          32,                    /* bitsize */
 451          TRUE,                  /* pc_relative */
 452          0,                     /* bitpos */
 453          complain_overflow_signed, /* complain_on_overflow */
 454          coff_amd64_reloc,      /* special_function */
 455          "R_X86_64_PC32",       /* name */
 456          TRUE,                  /* partial_inplace */
 457          0xffffffff,            /* src_mask */
 458          0xffffffff,            /* dst_mask */
 459          PCRELOFFSET)           /* pcrel_offset */
 460 };
 461
 462 #define NUM_HOWTOS ARRAY_SIZE (howto_table)
 463
 464 /* Turn a howto into a reloc  nunmber */
 465
 466 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
 467 #define I386  1                 /* Customize coffcode.h */
 468 #define AMD64 1
 469
 470 #define RTYPE2HOWTO(cache_ptr, dst)             \
 471   ((cache_ptr)->howto =                         \
 472    ((dst)->r_type < NUM_HOWTOS)                 \
 473     ? howto_table + (dst)->r_type               \
 474     : NULL)
 475
 476 /* For 386 COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
 477    library.  On some other COFF targets STYP_BSS is normally
 478    STYP_NOLOAD.  */
 479 #define BSS_NOLOAD_IS_SHARED_LIBRARY
 480
 481 /* Compute the addend of a reloc.  If the reloc is to a common symbol,
 482    the object file contains the value of the common symbol.  By the
 483    time this is called, the linker may be using a different symbol
 484    from a different object file with a different value.  Therefore, we
 485    hack wildly to locate the original symbol from this file so that we
 486    can make the correct adjustment.  This macro sets coffsym to the
 487    symbol from the original file, and uses it to set the addend value
 488    correctly.  If this is not a common symbol, the usual addend
 489    calculation is done, except that an additional tweak is needed for
 490    PC relative relocs.
 491    FIXME: This macro refers to symbols and asect; these are from the
 492    calling function, not the macro arguments.  */
 493
 494 #define CALC_ADDEND(abfd, ptr, reloc, cache_ptr)                \
 495   {                                                             \
 496     coff_symbol_type *coffsym = NULL;                           \
 497                                                                 \
 498     if (ptr && bfd_asymbol_bfd (ptr) != abfd)                   \
 499       coffsym = (obj_symbols (abfd)                             \
 500                  + (cache_ptr->sym_ptr_ptr - symbols));         \
 501     else if (ptr)                                               \
 502       coffsym = coff_symbol_from (ptr);                         \
 503                                                                 \
 504     if (coffsym != NULL                                         \
 505         && coffsym->native->u.syment.n_scnum == 0)              \
 506       cache_ptr->addend = - coffsym->native->u.syment.n_value;  \
 507     else if (ptr && bfd_asymbol_bfd (ptr) == abfd               \
 508              && ptr->section != NULL)                           \
 509       cache_ptr->addend = - (ptr->section->vma + ptr->value);   \
 510     else                                                        \
 511       cache_ptr->addend = 0;                                    \
 512     if (ptr && reloc.r_type < NUM_HOWTOS                        \
 513         && howto_table[reloc.r_type].pc_relative)               \
 514       cache_ptr->addend += asect->vma;                          \
 515   }
 516
 517 /* We use the special COFF backend linker.  For normal AMD64 COFF, we
 518    can use the generic relocate_section routine.  For PE, we need our
 519    own routine.  */
 520
 521 #if !defined(COFF_WITH_PE)
 522
 523 #define coff_relocate_section _bfd_coff_generic_relocate_section
 524
 525 #else /* COFF_WITH_PE */
 526
 527 /* The PE relocate section routine.  The only difference between this
 528    and the regular routine is that we don't want to do anything for a
 529    relocatable link.  */
 530
 531 static bfd_boolean
 532 coff_pe_amd64_relocate_section (bfd *output_bfd,
 533                                 struct bfd_link_info *info,
 534                                 bfd *input_bfd,
 535                                 asection *input_section,
 536                                 bfd_byte *contents,
 537                                 struct internal_reloc *relocs,
 538                                 struct internal_syment *syms,
 539                                 asection **sections)
 540 {
 541   if (bfd_link_relocatable (info))
 542     return TRUE;
 543
 544   return _bfd_coff_generic_relocate_section (output_bfd, info, input_bfd,input_section, contents,relocs, syms, sections);
 545 }
 546
 547 #define coff_relocate_section coff_pe_amd64_relocate_section
 548
 549 #endif /* COFF_WITH_PE */
 550
 551 /* Convert an rtype to howto for the COFF backend linker.  */
 552
 553 static reloc_howto_type *
 554 coff_amd64_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
 555                            asection *sec,
 556                            struct internal_reloc *rel,
 557                            struct coff_link_hash_entry *h,
 558                            struct internal_syment *sym,
 559                            bfd_vma *addendp)
 560 {
 561   reloc_howto_type *howto;
 562
 563   if (rel->r_type >= NUM_HOWTOS)
 564     {
 565       bfd_set_error (bfd_error_bad_value);
 566       return NULL;
 567     }
 568   howto = howto_table + rel->r_type;
 569
 570 #if defined(COFF_WITH_PE)
 571   /* Cancel out code in _bfd_coff_generic_relocate_section.  */
 572   *addendp = 0;
 573   if (rel->r_type >= R_AMD64_PCRLONG_1 && rel->r_type <= R_AMD64_PCRLONG_5)
 574     {
 575       *addendp -= (bfd_vma)(rel->r_type - R_AMD64_PCRLONG);
 576       rel->r_type = R_AMD64_PCRLONG;
 577     }
 578 #endif
 579
 580   if (howto->pc_relative)
 581     *addendp += sec->vma;
 582
 583   if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
 584     {
 585       /* This is a common symbol.  The section contents include the
 586          size (sym->n_value) as an addend.  The relocate_section
 587          function will be adding in the final value of the symbol.  We
 588          need to subtract out the current size in order to get the
 589          correct result.  */
 590       BFD_ASSERT (h != NULL);
 591
 592 #if !defined(COFF_WITH_PE)
 593       /* I think we *do* want to bypass this.  If we don't, I have
 594          seen some data parameters get the wrong relocation address.
 595          If I link two versions with and without this section bypassed
 596          and then do a binary comparison, the addresses which are
 597          different can be looked up in the map.  The case in which
 598          this section has been bypassed has addresses which correspond
 599          to values I can find in the map.  */
 600       *addendp -= sym->n_value;
 601 #endif
 602     }
 603
 604 #if !defined(COFF_WITH_PE)
 605   /* If the output symbol is common (in which case this must be a
 606      relocatable link), we need to add in the final size of the
 607      common symbol.  */
 608   if (h != NULL && h->root.type == bfd_link_hash_common)
 609     *addendp += h->root.u.c.size;
 610 #endif
 611
 612 #if defined(COFF_WITH_PE)
 613   if (howto->pc_relative)
 614     {
 615       *addendp -= 4;
 616
 617       /* If the symbol is defined, then the generic code is going to
 618          add back the symbol value in order to cancel out an
 619          adjustment it made to the addend.  However, we set the addend
 620          to 0 at the start of this function.  We need to adjust here,
 621          to avoid the adjustment the generic code will make.  FIXME:
 622          This is getting a bit hackish.  */
 623       if (sym != NULL && sym->n_scnum != 0)
 624         *addendp -= sym->n_value;
 625     }
 626
 627   if (rel->r_type == R_AMD64_IMAGEBASE
 628       && (bfd_get_flavour (sec->output_section->owner) == bfd_target_coff_flavour))
 629     *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
 630
 631   if (rel->r_type == R_AMD64_SECREL)
 632     {
 633       bfd_vma osect_vma;
 634
 635       if (h && (h->root.type == bfd_link_hash_defined
 636                 || h->root.type == bfd_link_hash_defweak))
 637         osect_vma = h->root.u.def.section->output_section->vma;
 638       else
 639         {
 640           asection *s;
 641           int i;
 642
 643           /* Sigh, the only way to get the section to offset against
 644              is to find it the hard way.  */
 645           for (s = abfd->sections, i = 1; i < sym->n_scnum; i++)
 646             s = s->next;
 647
 648           osect_vma = s->output_section->vma;
 649         }
 650
 651       *addendp -= osect_vma;
 652     }
 653 #endif
 654
 655   return howto;
 656 }
 657
 658 #define coff_bfd_reloc_type_lookup coff_amd64_reloc_type_lookup
 659 #define coff_bfd_reloc_name_lookup coff_amd64_reloc_name_lookup
 660
 661 static reloc_howto_type *
 662 coff_amd64_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
 663 {
 664   switch (code)
 665     {
 666     case BFD_RELOC_RVA:
 667       return howto_table + R_AMD64_IMAGEBASE;
 668     case BFD_RELOC_32:
 669       return howto_table + R_AMD64_DIR32;
 670     case BFD_RELOC_64:
 671       return howto_table + R_AMD64_DIR64;
 672     case BFD_RELOC_64_PCREL:
 673 #ifndef DONT_EXTEND_AMD64
 674       return howto_table + R_AMD64_PCRQUAD;
 675 #else
 676       /* Fall through.  */
 677 #endif
 678     case BFD_RELOC_32_PCREL:
 679       return howto_table + R_AMD64_PCRLONG;
 680     case BFD_RELOC_X86_64_32S:
 681       return howto_table + R_RELLONG;
 682     case BFD_RELOC_16:
 683       return howto_table + R_RELWORD;
 684     case BFD_RELOC_16_PCREL:
 685       return howto_table + R_PCRWORD;
 686     case BFD_RELOC_8:
 687       return howto_table + R_RELBYTE;
 688     case BFD_RELOC_8_PCREL:
 689       return howto_table + R_PCRBYTE;
 690 #if defined(COFF_WITH_PE)
 691     case BFD_RELOC_32_SECREL:
 692       return howto_table + R_AMD64_SECREL;
 693 #endif
 694     default:
 695       BFD_FAIL ();
 696       return 0;
 697     }
 698 }
 699
 700 static reloc_howto_type *
 701 coff_amd64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 702                               const char *r_name)
 703 {
 704   unsigned int i;
 705
 706   for (i = 0; i < NUM_HOWTOS; i++)
 707     if (howto_table[i].name != NULL
 708         && strcasecmp (howto_table[i].name, r_name) == 0)
 709       return &howto_table[i];
 710
 711   return NULL;
 712 }
 713
 714 #define coff_rtype_to_howto coff_amd64_rtype_to_howto
 715
 716 #ifdef TARGET_UNDERSCORE
 717
 718 /* If amd64 gcc uses underscores for symbol names, then it does not use
 719    a leading dot for local labels, so if TARGET_UNDERSCORE is defined
 720    we treat all symbols starting with L as local.  */
 721
 722 static bfd_boolean
 723 coff_amd64_is_local_label_name (bfd *abfd, const char *name)
 724 {
 725   if (name[0] == 'L')
 726     return TRUE;
 727
 728   return _bfd_coff_is_local_label_name (abfd, name);
 729 }
 730
 731 #define coff_bfd_is_local_label_name coff_amd64_is_local_label_name
 732
 733 #endif /* TARGET_UNDERSCORE */
 734
 735 #ifndef bfd_pe_print_pdata
 736 #define bfd_pe_print_pdata   NULL
 737 #endif
 738
 739 #include "coffcode.h"
 740
 741 #ifdef PE
 742 #define amd64coff_object_p pe_bfd_object_p
 743 #else
 744 #define amd64coff_object_p coff_object_p
 745 #endif
 746
 747 const bfd_target
 748 #ifdef TARGET_SYM
 749   TARGET_SYM =
 750 #else
 751   x86_64_coff_vec =
 752 #endif
 753 {
 754 #ifdef TARGET_NAME
 755   TARGET_NAME,
 756 #else
 757  "coff-x86-64",                 /* Name.  */
 758 #endif
 759   bfd_target_coff_flavour,
 760   BFD_ENDIAN_LITTLE,            /* Data byte order is little.  */
 761   BFD_ENDIAN_LITTLE,            /* Header byte order is little.  */
 762
 763   (HAS_RELOC | EXEC_P |         /* Object flags.  */
 764    HAS_LINENO | HAS_DEBUG |
 765    HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED | BFD_COMPRESS | BFD_DECOMPRESS),
 766
 767   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* Section flags.  */
 768 #if defined(COFF_WITH_PE)
 769    | SEC_LINK_ONCE | SEC_LINK_DUPLICATES | SEC_READONLY | SEC_DEBUGGING
 770 #endif
 771    | SEC_CODE | SEC_DATA | SEC_EXCLUDE ),
 772
 773 #ifdef TARGET_UNDERSCORE
 774   TARGET_UNDERSCORE,            /* Leading underscore.  */
 775 #else
 776   0,                            /* Leading underscore.  */
 777 #endif
 778   '/',                          /* Ar_pad_char.  */
 779   15,                           /* Ar_max_namelen.  */
 780   0,                            /* match priority.  */
 781
 782   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 783      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 784      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data.  */
 785   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 786      bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 787      bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Hdrs.  */
 788
 789   /* Note that we allow an object file to be treated as a core file as well.  */
 790   { _bfd_dummy_target, amd64coff_object_p, /* BFD_check_format.  */
 791     bfd_generic_archive_p, amd64coff_object_p },
 792   { bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format.  */
 793     bfd_false },
 794   { bfd_false, coff_write_object_contents, /* bfd_write_contents.  */
 795    _bfd_write_archive_contents, bfd_false },
 796
 797   BFD_JUMP_TABLE_GENERIC (coff),
 798   BFD_JUMP_TABLE_COPY (coff),
 799   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 800   BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 801   BFD_JUMP_TABLE_SYMBOLS (coff),
 802   BFD_JUMP_TABLE_RELOCS (coff),
 803   BFD_JUMP_TABLE_WRITE (coff),
 804   BFD_JUMP_TABLE_LINK (coff),
 805   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 806
 807   NULL,
 808
 809   COFF_SWAP_TABLE
 810 };