bfd/reloc.c

   1 /* BFD support for handling relocation entries.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001
   4    Free Software Foundation, Inc.
   5    Written by Cygnus Support.
   6
   7 This file is part of BFD, the Binary File Descriptor library.
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program; if not, write to the Free Software
  21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  22
  23 /*
  24 SECTION
  25         Relocations
  26
  27         BFD maintains relocations in much the same way it maintains
  28         symbols: they are left alone until required, then read in
  29         en-masse and translated into an internal form.  A common
  30         routine <<bfd_perform_relocation>> acts upon the
  31         canonical form to do the fixup.
  32
  33         Relocations are maintained on a per section basis,
  34         while symbols are maintained on a per BFD basis.
  35
  36         All that a back end has to do to fit the BFD interface is to create
  37         a <<struct reloc_cache_entry>> for each relocation
  38         in a particular section, and fill in the right bits of the structures.
  39
  40 @menu
  41 @* typedef arelent::
  42 @* howto manager::
  43 @end menu
  44
  45 */
  46
  47 /* DO compile in the reloc_code name table from libbfd.h.  */
  48 #define _BFD_MAKE_TABLE_bfd_reloc_code_real
  49
  50 #include "bfd.h"
  51 #include "sysdep.h"
  52 #include "bfdlink.h"
  53 #include "libbfd.h"
  54 /*
  55 DOCDD
  56 INODE
  57         typedef arelent, howto manager, Relocations, Relocations
  58
  59 SUBSECTION
  60         typedef arelent
  61
  62         This is the structure of a relocation entry:
  63
  64 CODE_FRAGMENT
  65 .
  66 .typedef enum bfd_reloc_status
  67 .{
  68 .  {* No errors detected *}
  69 .  bfd_reloc_ok,
  70 .
  71 .  {* The relocation was performed, but there was an overflow. *}
  72 .  bfd_reloc_overflow,
  73 .
  74 .  {* The address to relocate was not within the section supplied. *}
  75 .  bfd_reloc_outofrange,
  76 .
  77 .  {* Used by special functions *}
  78 .  bfd_reloc_continue,
  79 .
  80 .  {* Unsupported relocation size requested. *}
  81 .  bfd_reloc_notsupported,
  82 .
  83 .  {* Unused *}
  84 .  bfd_reloc_other,
  85 .
  86 .  {* The symbol to relocate against was undefined. *}
  87 .  bfd_reloc_undefined,
  88 .
  89 .  {* The relocation was performed, but may not be ok - presently
  90 .     generated only when linking i960 coff files with i960 b.out
  91 .     symbols.  If this type is returned, the error_message argument
  92 .     to bfd_perform_relocation will be set.  *}
  93 .  bfd_reloc_dangerous
  94 . }
  95 . bfd_reloc_status_type;
  96 .
  97 .
  98 .typedef struct reloc_cache_entry
  99 .{
 100 .  {* A pointer into the canonical table of pointers  *}
 101 .  struct symbol_cache_entry **sym_ptr_ptr;
 102 .
 103 .  {* offset in section *}
 104 .  bfd_size_type address;
 105 .
 106 .  {* addend for relocation value *}
 107 .  bfd_vma addend;
 108 .
 109 .  {* Pointer to how to perform the required relocation *}
 110 .  reloc_howto_type *howto;
 111 .
 112 .} arelent;
 113
 114 */
 115
 116 /*
 117 DESCRIPTION
 118
 119         Here is a description of each of the fields within an <<arelent>>:
 120
 121         o <<sym_ptr_ptr>>
 122
 123         The symbol table pointer points to a pointer to the symbol
 124         associated with the relocation request.  It is
 125         the pointer into the table returned by the back end's
 126         <<get_symtab>> action. @xref{Symbols}. The symbol is referenced
 127         through a pointer to a pointer so that tools like the linker
 128         can fix up all the symbols of the same name by modifying only
 129         one pointer. The relocation routine looks in the symbol and
 130         uses the base of the section the symbol is attached to and the
 131         value of the symbol as the initial relocation offset. If the
 132         symbol pointer is zero, then the section provided is looked up.
 133
 134         o <<address>>
 135
 136         The <<address>> field gives the offset in bytes from the base of
 137         the section data which owns the relocation record to the first
 138         byte of relocatable information. The actual data relocated
 139         will be relative to this point; for example, a relocation
 140         type which modifies the bottom two bytes of a four byte word
 141         would not touch the first byte pointed to in a big endian
 142         world.
 143
 144         o <<addend>>
 145
 146         The <<addend>> is a value provided by the back end to be added (!)
 147         to the relocation offset. Its interpretation is dependent upon
 148         the howto. For example, on the 68k the code:
 149
 150 |        char foo[];
 151 |        main()
 152 |                {
 153 |                return foo[0x12345678];
 154 |                }
 155
 156         Could be compiled into:
 157
 158 |        linkw fp,#-4
 159 |        moveb @@#12345678,d0
 160 |        extbl d0
 161 |        unlk fp
 162 |        rts
 163
 164         This could create a reloc pointing to <<foo>>, but leave the
 165         offset in the data, something like:
 166
 167 |RELOCATION RECORDS FOR [.text]:
 168 |offset   type      value
 169 |00000006 32        _foo
 170 |
 171 |00000000 4e56 fffc          ; linkw fp,#-4
 172 |00000004 1039 1234 5678     ; moveb @@#12345678,d0
 173 |0000000a 49c0               ; extbl d0
 174 |0000000c 4e5e               ; unlk fp
 175 |0000000e 4e75               ; rts
 176
 177         Using coff and an 88k, some instructions don't have enough
 178         space in them to represent the full address range, and
 179         pointers have to be loaded in two parts. So you'd get something like:
 180
 181 |        or.u     r13,r0,hi16(_foo+0x12345678)
 182 |        ld.b     r2,r13,lo16(_foo+0x12345678)
 183 |        jmp      r1
 184
 185         This should create two relocs, both pointing to <<_foo>>, and with
 186         0x12340000 in their addend field. The data would consist of:
 187
 188 |RELOCATION RECORDS FOR [.text]:
 189 |offset   type      value
 190 |00000002 HVRT16    _foo+0x12340000
 191 |00000006 LVRT16    _foo+0x12340000
 192 |
 193 |00000000 5da05678           ; or.u r13,r0,0x5678
 194 |00000004 1c4d5678           ; ld.b r2,r13,0x5678
 195 |00000008 f400c001           ; jmp r1
 196
 197         The relocation routine digs out the value from the data, adds
 198         it to the addend to get the original offset, and then adds the
 199         value of <<_foo>>. Note that all 32 bits have to be kept around
 200         somewhere, to cope with carry from bit 15 to bit 16.
 201
 202         One further example is the sparc and the a.out format. The
 203         sparc has a similar problem to the 88k, in that some
 204         instructions don't have room for an entire offset, but on the
 205         sparc the parts are created in odd sized lumps. The designers of
 206         the a.out format chose to not use the data within the section
 207         for storing part of the offset; all the offset is kept within
 208         the reloc. Anything in the data should be ignored.
 209
 210 |        save %sp,-112,%sp
 211 |        sethi %hi(_foo+0x12345678),%g2
 212 |        ldsb [%g2+%lo(_foo+0x12345678)],%i0
 213 |        ret
 214 |        restore
 215
 216         Both relocs contain a pointer to <<foo>>, and the offsets
 217         contain junk.
 218
 219 |RELOCATION RECORDS FOR [.text]:
 220 |offset   type      value
 221 |00000004 HI22      _foo+0x12345678
 222 |00000008 LO10      _foo+0x12345678
 223 |
 224 |00000000 9de3bf90     ; save %sp,-112,%sp
 225 |00000004 05000000     ; sethi %hi(_foo+0),%g2
 226 |00000008 f048a000     ; ldsb [%g2+%lo(_foo+0)],%i0
 227 |0000000c 81c7e008     ; ret
 228 |00000010 81e80000     ; restore
 229
 230         o <<howto>>
 231
 232         The <<howto>> field can be imagined as a
 233         relocation instruction. It is a pointer to a structure which
 234         contains information on what to do with all of the other
 235         information in the reloc record and data section. A back end
 236         would normally have a relocation instruction set and turn
 237         relocations into pointers to the correct structure on input -
 238         but it would be possible to create each howto field on demand.
 239
 240 */
 241
 242 /*
 243 SUBSUBSECTION
 244         <<enum complain_overflow>>
 245
 246         Indicates what sort of overflow checking should be done when
 247         performing a relocation.
 248
 249 CODE_FRAGMENT
 250 .
 251 .enum complain_overflow
 252 .{
 253 .  {* Do not complain on overflow. *}
 254 .  complain_overflow_dont,
 255 .
 256 .  {* Complain if the bitfield overflows, whether it is considered
 257 .     as signed or unsigned. *}
 258 .  complain_overflow_bitfield,
 259 .
 260 .  {* Complain if the value overflows when considered as signed
 261 .     number. *}
 262 .  complain_overflow_signed,
 263 .
 264 .  {* Complain if the value overflows when considered as an
 265 .     unsigned number. *}
 266 .  complain_overflow_unsigned
 267 .};
 268
 269 */
 270
 271 /*
 272 SUBSUBSECTION
 273         <<reloc_howto_type>>
 274
 275         The <<reloc_howto_type>> is a structure which contains all the
 276         information that libbfd needs to know to tie up a back end's data.
 277
 278 CODE_FRAGMENT
 279 .struct symbol_cache_entry;             {* Forward declaration *}
 280 .
 281 .struct reloc_howto_struct
 282 .{
 283 .  {*  The type field has mainly a documentary use - the back end can
 284 .      do what it wants with it, though normally the back end's
 285 .      external idea of what a reloc number is stored
 286 .      in this field.  For example, a PC relative word relocation
 287 .      in a coff environment has the type 023 - because that's
 288 .      what the outside world calls a R_PCRWORD reloc.  *}
 289 .  unsigned int type;
 290 .
 291 .  {*  The value the final relocation is shifted right by.  This drops
 292 .      unwanted data from the relocation.  *}
 293 .  unsigned int rightshift;
 294 .
 295 .  {*  The size of the item to be relocated.  This is *not* a
 296 .      power-of-two measure.  To get the number of bytes operated
 297 .      on by a type of relocation, use bfd_get_reloc_size.  *}
 298 .  int size;
 299 .
 300 .  {*  The number of bits in the item to be relocated.  This is used
 301 .      when doing overflow checking.  *}
 302 .  unsigned int bitsize;
 303 .
 304 .  {*  Notes that the relocation is relative to the location in the
 305 .      data section of the addend.  The relocation function will
 306 .      subtract from the relocation value the address of the location
 307 .      being relocated.  *}
 308 .  boolean pc_relative;
 309 .
 310 .  {*  The bit position of the reloc value in the destination.
 311 .      The relocated value is left shifted by this amount.  *}
 312 .  unsigned int bitpos;
 313 .
 314 .  {* What type of overflow error should be checked for when
 315 .     relocating.  *}
 316 .  enum complain_overflow complain_on_overflow;
 317 .
 318 .  {* If this field is non null, then the supplied function is
 319 .     called rather than the normal function.  This allows really
 320 .     strange relocation methods to be accomodated (e.g., i960 callj
 321 .     instructions).  *}
 322 .  bfd_reloc_status_type (*special_function)
 323 .    PARAMS ((bfd *, arelent *, struct symbol_cache_entry *, PTR, asection *,
 324 .             bfd *, char **));
 325 .
 326 .  {* The textual name of the relocation type.  *}
 327 .  char *name;
 328 .
 329 .  {* Some formats record a relocation addend in the section contents
 330 .     rather than with the relocation.  For ELF formats this is the
 331 .     distinction between USE_REL and USE_RELA (though the code checks
 332 .     for USE_REL == 1/0).  The value of this field is TRUE if the
 333 .     addend is recorded with the section contents; when performing a
 334 .     partial link (ld -r) the section contents (the data) will be
 335 .     modified.  The value of this field is FALSE if addends are
 336 .     recorded with the relocation (in arelent.addend); when performing
 337 .     a partial link the relocation will be modified.
 338 .     All relocations for all ELF USE_RELA targets should set this field
 339 .     to FALSE (values of TRUE should be looked on with suspicion).
 340 .     However, the converse is not true: not all relocations of all ELF
 341 .     USE_REL targets set this field to TRUE.  Why this is so is peculiar
 342 .     to each particular target.  For relocs that aren't used in partial
 343 .     links (e.g. GOT stuff) it doesn't matter what this is set to.  *}
 344 .  boolean partial_inplace;
 345 .
 346 .  {* The src_mask selects which parts of the read in data
 347 .     are to be used in the relocation sum.  E.g., if this was an 8 bit
 348 .     byte of data which we read and relocated, this would be
 349 .     0x000000ff.  When we have relocs which have an addend, such as
 350 .     sun4 extended relocs, the value in the offset part of a
 351 .     relocating field is garbage so we never use it.  In this case
 352 .     the mask would be 0x00000000.  *}
 353 .  bfd_vma src_mask;
 354 .
 355 .  {* The dst_mask selects which parts of the instruction are replaced
 356 .     into the instruction.  In most cases src_mask == dst_mask,
 357 .     except in the above special case, where dst_mask would be
 358 .     0x000000ff, and src_mask would be 0x00000000.  *}
 359 .  bfd_vma dst_mask;
 360 .
 361 .  {* When some formats create PC relative instructions, they leave
 362 .     the value of the pc of the place being relocated in the offset
 363 .     slot of the instruction, so that a PC relative relocation can
 364 .     be made just by adding in an ordinary offset (e.g., sun3 a.out).
 365 .     Some formats leave the displacement part of an instruction
 366 .     empty (e.g., m88k bcs); this flag signals the fact.  *}
 367 .  boolean pcrel_offset;
 368 .};
 369
 370 */
 371
 372 /*
 373 FUNCTION
 374         The HOWTO Macro
 375
 376 DESCRIPTION
 377         The HOWTO define is horrible and will go away.
 378
 379 .#define HOWTO(C, R, S, B, P, BI, O, SF, NAME, INPLACE, MASKSRC, MASKDST, PC) \
 380 .  { (unsigned) C, R, S, B, P, BI, O, SF, NAME, INPLACE, MASKSRC, MASKDST, PC }
 381
 382 DESCRIPTION
 383         And will be replaced with the totally magic way. But for the
 384         moment, we are compatible, so do it this way.
 385
 386 .#define NEWHOWTO(FUNCTION, NAME, SIZE, REL, IN) \
 387 .  HOWTO (0, 0, SIZE, 0, REL, 0, complain_overflow_dont, FUNCTION, \
 388 .         NAME, false, 0, 0, IN)
 389 .
 390
 391 DESCRIPTION
 392         This is used to fill in an empty howto entry in an array.
 393
 394 .#define EMPTY_HOWTO(C) \
 395 .  HOWTO ((C), 0, 0, 0, false, 0, complain_overflow_dont, NULL, \
 396 .         NULL, false, 0, 0, false)
 397 .
 398
 399 DESCRIPTION
 400         Helper routine to turn a symbol into a relocation value.
 401
 402 .#define HOWTO_PREPARE(relocation, symbol)               \
 403 .  {                                                     \
 404 .    if (symbol != (asymbol *) NULL)                     \
 405 .      {                                                 \
 406 .        if (bfd_is_com_section (symbol->section))       \
 407 .          {                                             \
 408 .            relocation = 0;                             \
 409 .          }                                             \
 410 .        else                                            \
 411 .          {                                             \
 412 .            relocation = symbol->value;                 \
 413 .          }                                             \
 414 .      }                                                 \
 415 .  }
 416
 417 */
 418
 419 /*
 420 FUNCTION
 421         bfd_get_reloc_size
 422
 423 SYNOPSIS
 424         unsigned int bfd_get_reloc_size (reloc_howto_type *);
 425
 426 DESCRIPTION
 427         For a reloc_howto_type that operates on a fixed number of bytes,
 428         this returns the number of bytes operated on.
 429  */
 430
 431 unsigned int
 432 bfd_get_reloc_size (howto)
 433      reloc_howto_type *howto;
 434 {
 435   switch (howto->size)
 436     {
 437     case 0: return 1;
 438     case 1: return 2;
 439     case 2: return 4;
 440     case 3: return 0;
 441     case 4: return 8;
 442     case 8: return 16;
 443     case -2: return 4;
 444     default: abort ();
 445     }
 446 }
 447
 448 /*
 449 TYPEDEF
 450         arelent_chain
 451
 452 DESCRIPTION
 453
 454         How relocs are tied together in an <<asection>>:
 455
 456 .typedef struct relent_chain
 457 .{
 458 .  arelent relent;
 459 .  struct relent_chain *next;
 460 .} arelent_chain;
 461
 462 */
 463
 464 /* N_ONES produces N one bits, without overflowing machine arithmetic.  */
 465 #define N_ONES(n) (((((bfd_vma) 1 << ((n) - 1)) - 1) << 1) | 1)
 466
 467 /*
 468 FUNCTION
 469         bfd_check_overflow
 470
 471 SYNOPSIS
 472         bfd_reloc_status_type
 473                 bfd_check_overflow
 474                         (enum complain_overflow how,
 475                          unsigned int bitsize,
 476                          unsigned int rightshift,
 477                          unsigned int addrsize,
 478                          bfd_vma relocation);
 479
 480 DESCRIPTION
 481         Perform overflow checking on @var{relocation} which has
 482         @var{bitsize} significant bits and will be shifted right by
 483         @var{rightshift} bits, on a machine with addresses containing
 484         @var{addrsize} significant bits.  The result is either of
 485         @code{bfd_reloc_ok} or @code{bfd_reloc_overflow}.
 486
 487 */
 488
 489 bfd_reloc_status_type
 490 bfd_check_overflow (how, bitsize, rightshift, addrsize, relocation)
 491      enum complain_overflow how;
 492      unsigned int bitsize;
 493      unsigned int rightshift;
 494      unsigned int addrsize;
 495      bfd_vma relocation;
 496 {
 497   bfd_vma fieldmask, addrmask, signmask, ss, a;
 498   bfd_reloc_status_type flag = bfd_reloc_ok;
 499
 500   a = relocation;
 501
 502   /* Note: BITSIZE should always be <= ADDRSIZE, but in case it's not,
 503      we'll be permissive: extra bits in the field mask will
 504      automatically extend the address mask for purposes of the
 505      overflow check.  */
 506   fieldmask = N_ONES (bitsize);
 507   addrmask = N_ONES (addrsize) | fieldmask;
 508
 509   switch (how)
 510     {
 511     case complain_overflow_dont:
 512       break;
 513
 514     case complain_overflow_signed:
 515       /* If any sign bits are set, all sign bits must be set.  That
 516          is, A must be a valid negative address after shifting.  */
 517       a = (a & addrmask) >> rightshift;
 518       signmask = ~ (fieldmask >> 1);
 519       ss = a & signmask;
 520       if (ss != 0 && ss != ((addrmask >> rightshift) & signmask))
 521         flag = bfd_reloc_overflow;
 522       break;
 523
 524     case complain_overflow_unsigned:
 525       /* We have an overflow if the address does not fit in the field.  */
 526       a = (a & addrmask) >> rightshift;
 527       if ((a & ~ fieldmask) != 0)
 528         flag = bfd_reloc_overflow;
 529       break;
 530
 531     case complain_overflow_bitfield:
 532       /* Bitfields are sometimes signed, sometimes unsigned.  We
 533          explicitly allow an address wrap too, which means a bitfield
 534          of n bits is allowed to store -2**n to 2**n-1.  Thus overflow
 535          if the value has some, but not all, bits set outside the
 536          field.  */
 537       a >>= rightshift;
 538       ss = a & ~ fieldmask;
 539       if (ss != 0 && ss != (((bfd_vma) -1 >> rightshift) & ~ fieldmask))
 540         flag = bfd_reloc_overflow;
 541       break;
 542
 543     default:
 544       abort ();
 545     }
 546
 547   return flag;
 548 }
 549
 550 /*
 551 FUNCTION
 552         bfd_perform_relocation
 553
 554 SYNOPSIS
 555         bfd_reloc_status_type
 556                 bfd_perform_relocation
 557                         (bfd *abfd,
 558                          arelent *reloc_entry,
 559                          PTR data,
 560                          asection *input_section,
 561                          bfd *output_bfd,
 562                          char **error_message);
 563
 564 DESCRIPTION
 565         If @var{output_bfd} is supplied to this function, the
 566         generated image will be relocatable; the relocations are
 567         copied to the output file after they have been changed to
 568         reflect the new state of the world. There are two ways of
 569         reflecting the results of partial linkage in an output file:
 570         by modifying the output data in place, and by modifying the
 571         relocation record.  Some native formats (e.g., basic a.out and
 572         basic coff) have no way of specifying an addend in the
 573         relocation type, so the addend has to go in the output data.
 574         This is no big deal since in these formats the output data
 575         slot will always be big enough for the addend. Complex reloc
 576         types with addends were invented to solve just this problem.
 577         The @var{error_message} argument is set to an error message if
 578         this return @code{bfd_reloc_dangerous}.
 579
 580 */
 581
 582 bfd_reloc_status_type
 583 bfd_perform_relocation (abfd, reloc_entry, data, input_section, output_bfd,
 584                         error_message)
 585      bfd *abfd;
 586      arelent *reloc_entry;
 587      PTR data;
 588      asection *input_section;
 589      bfd *output_bfd;
 590      char **error_message;
 591 {
 592   bfd_vma relocation;
 593   bfd_reloc_status_type flag = bfd_reloc_ok;
 594   bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
 595   bfd_vma output_base = 0;
 596   reloc_howto_type *howto = reloc_entry->howto;
 597   asection *reloc_target_output_section;
 598   asymbol *symbol;
 599
 600   symbol = *(reloc_entry->sym_ptr_ptr);
 601   if (bfd_is_abs_section (symbol->section)
 602       && output_bfd != (bfd *) NULL)
 603     {
 604       reloc_entry->address += input_section->output_offset;
 605       return bfd_reloc_ok;
 606     }
 607
 608   /* If we are not producing relocateable output, return an error if
 609      the symbol is not defined.  An undefined weak symbol is
 610      considered to have a value of zero (SVR4 ABI, p. 4-27).  */
 611   if (bfd_is_und_section (symbol->section)
 612       && (symbol->flags & BSF_WEAK) == 0
 613       && output_bfd == (bfd *) NULL)
 614     flag = bfd_reloc_undefined;
 615
 616   /* If there is a function supplied to handle this relocation type,
 617      call it.  It'll return `bfd_reloc_continue' if further processing
 618      can be done.  */
 619   if (howto->special_function)
 620     {
 621       bfd_reloc_status_type cont;
 622       cont = howto->special_function (abfd, reloc_entry, symbol, data,
 623                                       input_section, output_bfd,
 624                                       error_message);
 625       if (cont != bfd_reloc_continue)
 626         return cont;
 627     }
 628
 629   /* Is the address of the relocation really within the section?  */
 630   if (reloc_entry->address > (input_section->_cooked_size
 631                               / bfd_octets_per_byte (abfd)))
 632     return bfd_reloc_outofrange;
 633
 634   /* Work out which section the relocation is targetted at and the
 635      initial relocation command value.  */
 636
 637   /* Get symbol value.  (Common symbols are special.)  */
 638   if (bfd_is_com_section (symbol->section))
 639     relocation = 0;
 640   else
 641     relocation = symbol->value;
 642
 643   reloc_target_output_section = symbol->section->output_section;
 644
 645   /* Convert input-section-relative symbol value to absolute.  */
 646   if (output_bfd && howto->partial_inplace == false)
 647     output_base = 0;
 648   else
 649     output_base = reloc_target_output_section->vma;
 650
 651   relocation += output_base + symbol->section->output_offset;
 652
 653   /* Add in supplied addend.  */
 654   relocation += reloc_entry->addend;
 655
 656   /* Here the variable relocation holds the final address of the
 657      symbol we are relocating against, plus any addend.  */
 658
 659   if (howto->pc_relative == true)
 660     {
 661       /* This is a PC relative relocation.  We want to set RELOCATION
 662          to the distance between the address of the symbol and the
 663          location.  RELOCATION is already the address of the symbol.
 664
 665          We start by subtracting the address of the section containing
 666          the location.
 667
 668          If pcrel_offset is set, we must further subtract the position
 669          of the location within the section.  Some targets arrange for
 670          the addend to be the negative of the position of the location
 671          within the section; for example, i386-aout does this.  For
 672          i386-aout, pcrel_offset is false.  Some other targets do not
 673          include the position of the location; for example, m88kbcs,
 674          or ELF.  For those targets, pcrel_offset is true.
 675
 676          If we are producing relocateable output, then we must ensure
 677          that this reloc will be correctly computed when the final
 678          relocation is done.  If pcrel_offset is false we want to wind
 679          up with the negative of the location within the section,
 680          which means we must adjust the existing addend by the change
 681          in the location within the section.  If pcrel_offset is true
 682          we do not want to adjust the existing addend at all.
 683
 684          FIXME: This seems logical to me, but for the case of
 685          producing relocateable output it is not what the code
 686          actually does.  I don't want to change it, because it seems
 687          far too likely that something will break.  */
 688
 689       relocation -=
 690         input_section->output_section->vma + input_section->output_offset;
 691
 692       if (howto->pcrel_offset == true)
 693         relocation -= reloc_entry->address;
 694     }
 695
 696   if (output_bfd != (bfd *) NULL)
 697     {
 698       if (howto->partial_inplace == false)
 699         {
 700           /* This is a partial relocation, and we want to apply the relocation
 701              to the reloc entry rather than the raw data. Modify the reloc
 702              inplace to reflect what we now know.  */
 703           reloc_entry->addend = relocation;
 704           reloc_entry->address += input_section->output_offset;
 705           return flag;
 706         }
 707       else
 708         {
 709           /* This is a partial relocation, but inplace, so modify the
 710              reloc record a bit.
 711
 712              If we've relocated with a symbol with a section, change
 713              into a ref to the section belonging to the symbol.  */
 714
 715           reloc_entry->address += input_section->output_offset;
 716
 717           /* WTF?? */
 718           if (abfd->xvec->flavour == bfd_target_coff_flavour
 719               && strcmp (abfd->xvec->name, "coff-Intel-little") != 0
 720               && strcmp (abfd->xvec->name, "coff-Intel-big") != 0)
 721             {
 722 #if 1
 723               /* For m68k-coff, the addend was being subtracted twice during
 724                  relocation with -r.  Removing the line below this comment
 725                  fixes that problem; see PR 2953.
 726
 727 However, Ian wrote the following, regarding removing the line below,
 728 which explains why it is still enabled:  --djm
 729
 730 If you put a patch like that into BFD you need to check all the COFF
 731 linkers.  I am fairly certain that patch will break coff-i386 (e.g.,
 732 SCO); see coff_i386_reloc in coff-i386.c where I worked around the
 733 problem in a different way.  There may very well be a reason that the
 734 code works as it does.
 735
 736 Hmmm.  The first obvious point is that bfd_perform_relocation should
 737 not have any tests that depend upon the flavour.  It's seem like
 738 entirely the wrong place for such a thing.  The second obvious point
 739 is that the current code ignores the reloc addend when producing
 740 relocateable output for COFF.  That's peculiar.  In fact, I really
 741 have no idea what the point of the line you want to remove is.
 742
 743 A typical COFF reloc subtracts the old value of the symbol and adds in
 744 the new value to the location in the object file (if it's a pc
 745 relative reloc it adds the difference between the symbol value and the
 746 location).  When relocating we need to preserve that property.
 747
 748 BFD handles this by setting the addend to the negative of the old
 749 value of the symbol.  Unfortunately it handles common symbols in a
 750 non-standard way (it doesn't subtract the old value) but that's a
 751 different story (we can't change it without losing backward
 752 compatibility with old object files) (coff-i386 does subtract the old
 753 value, to be compatible with existing coff-i386 targets, like SCO).
 754
 755 So everything works fine when not producing relocateable output.  When
 756 we are producing relocateable output, logically we should do exactly
 757 what we do when not producing relocateable output.  Therefore, your
 758 patch is correct.  In fact, it should probably always just set
 759 reloc_entry->addend to 0 for all cases, since it is, in fact, going to
 760 add the value into the object file.  This won't hurt the COFF code,
 761 which doesn't use the addend; I'm not sure what it will do to other
 762 formats (the thing to check for would be whether any formats both use
 763 the addend and set partial_inplace).
 764
 765 When I wanted to make coff-i386 produce relocateable output, I ran
 766 into the problem that you are running into: I wanted to remove that
 767 line.  Rather than risk it, I made the coff-i386 relocs use a special
 768 function; it's coff_i386_reloc in coff-i386.c.  The function
 769 specifically adds the addend field into the object file, knowing that
 770 bfd_perform_relocation is not going to.  If you remove that line, then
 771 coff-i386.c will wind up adding the addend field in twice.  It's
 772 trivial to fix; it just needs to be done.
 773
 774 The problem with removing the line is just that it may break some
 775 working code.  With BFD it's hard to be sure of anything.  The right
 776 way to deal with this is simply to build and test at least all the
 777 supported COFF targets.  It should be straightforward if time and disk
 778 space consuming.  For each target:
 779     1) build the linker
 780     2) generate some executable, and link it using -r (I would
 781        probably use paranoia.o and link against newlib/libc.a, which
 782        for all the supported targets would be available in
 783        /usr/cygnus/progressive/H-host/target/lib/libc.a).
 784     3) make the change to reloc.c
 785     4) rebuild the linker
 786     5) repeat step 2
 787     6) if the resulting object files are the same, you have at least
 788        made it no worse
 789     7) if they are different you have to figure out which version is
 790        right
 791 */
 792               relocation -= reloc_entry->addend;
 793 #endif
 794               reloc_entry->addend = 0;
 795             }
 796           else
 797             {
 798               reloc_entry->addend = relocation;
 799             }
 800         }
 801     }
 802   else
 803     {
 804       reloc_entry->addend = 0;
 805     }
 806
 807   /* FIXME: This overflow checking is incomplete, because the value
 808      might have overflowed before we get here.  For a correct check we
 809      need to compute the value in a size larger than bitsize, but we
 810      can't reasonably do that for a reloc the same size as a host
 811      machine word.
 812      FIXME: We should also do overflow checking on the result after
 813      adding in the value contained in the object file.  */
 814   if (howto->complain_on_overflow != complain_overflow_dont
 815       && flag == bfd_reloc_ok)
 816     flag = bfd_check_overflow (howto->complain_on_overflow,
 817                                howto->bitsize,
 818                                howto->rightshift,
 819                                bfd_arch_bits_per_address (abfd),
 820                                relocation);
 821
 822   /*
 823     Either we are relocating all the way, or we don't want to apply
 824     the relocation to the reloc entry (probably because there isn't
 825     any room in the output format to describe addends to relocs)
 826     */
 827
 828   /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
 829      (OSF version 1.3, compiler version 3.11).  It miscompiles the
 830      following program:
 831
 832      struct str
 833      {
 834        unsigned int i0;
 835      } s = { 0 };
 836
 837      int
 838      main ()
 839      {
 840        unsigned long x;
 841
 842        x = 0x100000000;
 843        x <<= (unsigned long) s.i0;
 844        if (x == 0)
 845          printf ("failed\n");
 846        else
 847          printf ("succeeded (%lx)\n", x);
 848      }
 849      */
 850
 851   relocation >>= (bfd_vma) howto->rightshift;
 852
 853   /* Shift everything up to where it's going to be used */
 854
 855   relocation <<= (bfd_vma) howto->bitpos;
 856
 857   /* Wait for the day when all have the mask in them */
 858
 859   /* What we do:
 860      i instruction to be left alone
 861      o offset within instruction
 862      r relocation offset to apply
 863      S src mask
 864      D dst mask
 865      N ~dst mask
 866      A part 1
 867      B part 2
 868      R result
 869
 870      Do this:
 871      ((  i i i i i o o o o o  from bfd_get<size>
 872      and           S S S S S) to get the size offset we want
 873      +   r r r r r r r r r r) to get the final value to place
 874      and           D D D D D  to chop to right size
 875      -----------------------
 876      =             A A A A A
 877      And this:
 878      (   i i i i i o o o o o  from bfd_get<size>
 879      and N N N N N          ) get instruction
 880      -----------------------
 881      =   B B B B B
 882
 883      And then:
 884      (   B B B B B
 885      or            A A A A A)
 886      -----------------------
 887      =   R R R R R R R R R R  put into bfd_put<size>
 888      */
 889
 890 #define DOIT(x) \
 891   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
 892
 893   switch (howto->size)
 894     {
 895     case 0:
 896       {
 897         char x = bfd_get_8 (abfd, (char *) data + octets);
 898         DOIT (x);
 899         bfd_put_8 (abfd, x, (unsigned char *) data + octets);
 900       }
 901       break;
 902
 903     case 1:
 904       {
 905         short x = bfd_get_16 (abfd, (bfd_byte *) data + octets);
 906         DOIT (x);
 907         bfd_put_16 (abfd, (bfd_vma) x, (unsigned char *) data + octets);
 908       }
 909       break;
 910     case 2:
 911       {
 912         long x = bfd_get_32 (abfd, (bfd_byte *) data + octets);
 913         DOIT (x);
 914         bfd_put_32 (abfd, (bfd_vma) x, (bfd_byte *) data + octets);
 915       }
 916       break;
 917     case -2:
 918       {
 919         long x = bfd_get_32 (abfd, (bfd_byte *) data + octets);
 920         relocation = -relocation;
 921         DOIT (x);
 922         bfd_put_32 (abfd, (bfd_vma) x, (bfd_byte *) data + octets);
 923       }
 924       break;
 925
 926     case -1:
 927       {
 928         long x = bfd_get_16 (abfd, (bfd_byte *) data + octets);
 929         relocation = -relocation;
 930         DOIT (x);
 931         bfd_put_16 (abfd, (bfd_vma) x, (bfd_byte *) data + octets);
 932       }
 933       break;
 934
 935     case 3:
 936       /* Do nothing */
 937       break;
 938
 939     case 4:
 940 #ifdef BFD64
 941       {
 942         bfd_vma x = bfd_get_64 (abfd, (bfd_byte *) data + octets);
 943         DOIT (x);
 944         bfd_put_64 (abfd, x, (bfd_byte *) data + octets);
 945       }
 946 #else
 947       abort ();
 948 #endif
 949       break;
 950     default:
 951       return bfd_reloc_other;
 952     }
 953
 954   return flag;
 955 }
 956
 957 /*
 958 FUNCTION
 959         bfd_install_relocation
 960
 961 SYNOPSIS
 962         bfd_reloc_status_type
 963                 bfd_install_relocation
 964                         (bfd *abfd,
 965                          arelent *reloc_entry,
 966                          PTR data, bfd_vma data_start,
 967                          asection *input_section,
 968                          char **error_message);
 969
 970 DESCRIPTION
 971         This looks remarkably like <<bfd_perform_relocation>>, except it
 972         does not expect that the section contents have been filled in.
 973         I.e., it's suitable for use when creating, rather than applying
 974         a relocation.
 975
 976         For now, this function should be considered reserved for the
 977         assembler.
 978
 979 */
 980
 981 bfd_reloc_status_type
 982 bfd_install_relocation (abfd, reloc_entry, data_start, data_start_offset,
 983                         input_section, error_message)
 984      bfd *abfd;
 985      arelent *reloc_entry;
 986      PTR data_start;
 987      bfd_vma data_start_offset;
 988      asection *input_section;
 989      char **error_message;
 990 {
 991   bfd_vma relocation;
 992   bfd_reloc_status_type flag = bfd_reloc_ok;
 993   bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
 994   bfd_vma output_base = 0;
 995   reloc_howto_type *howto = reloc_entry->howto;
 996   asection *reloc_target_output_section;
 997   asymbol *symbol;
 998   bfd_byte *data;
 999
1000   symbol = *(reloc_entry->sym_ptr_ptr);
1001   if (bfd_is_abs_section (symbol->section))
1002     {
1003       reloc_entry->address += input_section->output_offset;
1004       return bfd_reloc_ok;
1005     }
1006
1007   /* If there is a function supplied to handle this relocation type,
1008      call it.  It'll return `bfd_reloc_continue' if further processing
1009      can be done.  */
1010   if (howto->special_function)
1011     {
1012       bfd_reloc_status_type cont;
1013
1014       /* XXX - The special_function calls haven't been fixed up to deal
1015          with creating new relocations and section contents.  */
1016       cont = howto->special_function (abfd, reloc_entry, symbol,
1017                                       /* XXX - Non-portable! */
1018                                       ((bfd_byte *) data_start
1019                                        - data_start_offset),
1020                                       input_section, abfd, error_message);
1021       if (cont != bfd_reloc_continue)
1022         return cont;
1023     }
1024
1025   /* Is the address of the relocation really within the section?  */
1026   if (reloc_entry->address > (input_section->_cooked_size
1027                               / bfd_octets_per_byte (abfd)))
1028     return bfd_reloc_outofrange;
1029
1030   /* Work out which section the relocation is targetted at and the
1031      initial relocation command value.  */
1032
1033   /* Get symbol value.  (Common symbols are special.)  */
1034   if (bfd_is_com_section (symbol->section))
1035     relocation = 0;
1036   else
1037     relocation = symbol->value;
1038
1039   reloc_target_output_section = symbol->section->output_section;
1040
1041   /* Convert input-section-relative symbol value to absolute.  */
1042   if (howto->partial_inplace == false)
1043     output_base = 0;
1044   else
1045     output_base = reloc_target_output_section->vma;
1046
1047   relocation += output_base + symbol->section->output_offset;
1048
1049   /* Add in supplied addend.  */
1050   relocation += reloc_entry->addend;
1051
1052   /* Here the variable relocation holds the final address of the
1053      symbol we are relocating against, plus any addend.  */
1054
1055   if (howto->pc_relative == true)
1056     {
1057       /* This is a PC relative relocation.  We want to set RELOCATION
1058          to the distance between the address of the symbol and the
1059          location.  RELOCATION is already the address of the symbol.
1060
1061          We start by subtracting the address of the section containing
1062          the location.
1063
1064          If pcrel_offset is set, we must further subtract the position
1065          of the location within the section.  Some targets arrange for
1066          the addend to be the negative of the position of the location
1067          within the section; for example, i386-aout does this.  For
1068          i386-aout, pcrel_offset is false.  Some other targets do not
1069          include the position of the location; for example, m88kbcs,
1070          or ELF.  For those targets, pcrel_offset is true.
1071
1072          If we are producing relocateable output, then we must ensure
1073          that this reloc will be correctly computed when the final
1074          relocation is done.  If pcrel_offset is false we want to wind
1075          up with the negative of the location within the section,
1076          which means we must adjust the existing addend by the change
1077          in the location within the section.  If pcrel_offset is true
1078          we do not want to adjust the existing addend at all.
1079
1080          FIXME: This seems logical to me, but for the case of
1081          producing relocateable output it is not what the code
1082          actually does.  I don't want to change it, because it seems
1083          far too likely that something will break.  */
1084
1085       relocation -=
1086         input_section->output_section->vma + input_section->output_offset;
1087
1088       if (howto->pcrel_offset == true && howto->partial_inplace == true)
1089         relocation -= reloc_entry->address;
1090     }
1091
1092   if (howto->partial_inplace == false)
1093     {
1094       /* This is a partial relocation, and we want to apply the relocation
1095          to the reloc entry rather than the raw data. Modify the reloc
1096          inplace to reflect what we now know.  */
1097       reloc_entry->addend = relocation;
1098       reloc_entry->address += input_section->output_offset;
1099       return flag;
1100     }
1101   else
1102     {
1103       /* This is a partial relocation, but inplace, so modify the
1104          reloc record a bit.
1105
1106          If we've relocated with a symbol with a section, change
1107          into a ref to the section belonging to the symbol.  */
1108
1109       reloc_entry->address += input_section->output_offset;
1110
1111       /* WTF?? */
1112       if (abfd->xvec->flavour == bfd_target_coff_flavour
1113           && strcmp (abfd->xvec->name, "coff-Intel-little") != 0
1114           && strcmp (abfd->xvec->name, "coff-Intel-big") != 0)
1115         {
1116 #if 1
1117 /* For m68k-coff, the addend was being subtracted twice during
1118    relocation with -r.  Removing the line below this comment
1119    fixes that problem; see PR 2953.
1120
1121 However, Ian wrote the following, regarding removing the line below,
1122 which explains why it is still enabled:  --djm
1123
1124 If you put a patch like that into BFD you need to check all the COFF
1125 linkers.  I am fairly certain that patch will break coff-i386 (e.g.,
1126 SCO); see coff_i386_reloc in coff-i386.c where I worked around the
1127 problem in a different way.  There may very well be a reason that the
1128 code works as it does.
1129
1130 Hmmm.  The first obvious point is that bfd_install_relocation should
1131 not have any tests that depend upon the flavour.  It's seem like
1132 entirely the wrong place for such a thing.  The second obvious point
1133 is that the current code ignores the reloc addend when producing
1134 relocateable output for COFF.  That's peculiar.  In fact, I really
1135 have no idea what the point of the line you want to remove is.
1136
1137 A typical COFF reloc subtracts the old value of the symbol and adds in
1138 the new value to the location in the object file (if it's a pc
1139 relative reloc it adds the difference between the symbol value and the
1140 location).  When relocating we need to preserve that property.
1141
1142 BFD handles this by setting the addend to the negative of the old
1143 value of the symbol.  Unfortunately it handles common symbols in a
1144 non-standard way (it doesn't subtract the old value) but that's a
1145 different story (we can't change it without losing backward
1146 compatibility with old object files) (coff-i386 does subtract the old
1147 value, to be compatible with existing coff-i386 targets, like SCO).
1148
1149 So everything works fine when not producing relocateable output.  When
1150 we are producing relocateable output, logically we should do exactly
1151 what we do when not producing relocateable output.  Therefore, your
1152 patch is correct.  In fact, it should probably always just set
1153 reloc_entry->addend to 0 for all cases, since it is, in fact, going to
1154 add the value into the object file.  This won't hurt the COFF code,
1155 which doesn't use the addend; I'm not sure what it will do to other
1156 formats (the thing to check for would be whether any formats both use
1157 the addend and set partial_inplace).
1158
1159 When I wanted to make coff-i386 produce relocateable output, I ran
1160 into the problem that you are running into: I wanted to remove that
1161 line.  Rather than risk it, I made the coff-i386 relocs use a special
1162 function; it's coff_i386_reloc in coff-i386.c.  The function
1163 specifically adds the addend field into the object file, knowing that
1164 bfd_install_relocation is not going to.  If you remove that line, then
1165 coff-i386.c will wind up adding the addend field in twice.  It's
1166 trivial to fix; it just needs to be done.
1167
1168 The problem with removing the line is just that it may break some
1169 working code.  With BFD it's hard to be sure of anything.  The right
1170 way to deal with this is simply to build and test at least all the
1171 supported COFF targets.  It should be straightforward if time and disk
1172 space consuming.  For each target:
1173     1) build the linker
1174     2) generate some executable, and link it using -r (I would
1175        probably use paranoia.o and link against newlib/libc.a, which
1176        for all the supported targets would be available in
1177        /usr/cygnus/progressive/H-host/target/lib/libc.a).
1178     3) make the change to reloc.c
1179     4) rebuild the linker
1180     5) repeat step 2
1181     6) if the resulting object files are the same, you have at least
1182        made it no worse
1183     7) if they are different you have to figure out which version is
1184        right
1185 */
1186           relocation -= reloc_entry->addend;
1187 #endif
1188           reloc_entry->addend = 0;
1189         }
1190       else
1191         {
1192           reloc_entry->addend = relocation;
1193         }
1194     }
1195
1196   /* FIXME: This overflow checking is incomplete, because the value
1197      might have overflowed before we get here.  For a correct check we
1198      need to compute the value in a size larger than bitsize, but we
1199      can't reasonably do that for a reloc the same size as a host
1200      machine word.
1201      FIXME: We should also do overflow checking on the result after
1202      adding in the value contained in the object file.  */
1203   if (howto->complain_on_overflow != complain_overflow_dont)
1204     flag = bfd_check_overflow (howto->complain_on_overflow,
1205                                howto->bitsize,
1206                                howto->rightshift,
1207                                bfd_arch_bits_per_address (abfd),
1208                                relocation);
1209
1210   /*
1211     Either we are relocating all the way, or we don't want to apply
1212     the relocation to the reloc entry (probably because there isn't
1213     any room in the output format to describe addends to relocs)
1214     */
1215
1216   /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
1217      (OSF version 1.3, compiler version 3.11).  It miscompiles the
1218      following program:
1219
1220      struct str
1221      {
1222        unsigned int i0;
1223      } s = { 0 };
1224
1225      int
1226      main ()
1227      {
1228        unsigned long x;
1229
1230        x = 0x100000000;
1231        x <<= (unsigned long) s.i0;
1232        if (x == 0)
1233          printf ("failed\n");
1234        else
1235          printf ("succeeded (%lx)\n", x);
1236      }
1237      */
1238
1239   relocation >>= (bfd_vma) howto->rightshift;
1240
1241   /* Shift everything up to where it's going to be used */
1242
1243   relocation <<= (bfd_vma) howto->bitpos;
1244
1245   /* Wait for the day when all have the mask in them */
1246
1247   /* What we do:
1248      i instruction to be left alone
1249      o offset within instruction
1250      r relocation offset to apply
1251      S src mask
1252      D dst mask
1253      N ~dst mask
1254      A part 1
1255      B part 2
1256      R result
1257
1258      Do this:
1259      ((  i i i i i o o o o o  from bfd_get<size>
1260      and           S S S S S) to get the size offset we want
1261      +   r r r r r r r r r r) to get the final value to place
1262      and           D D D D D  to chop to right size
1263      -----------------------
1264      =             A A A A A
1265      And this:
1266      (   i i i i i o o o o o  from bfd_get<size>
1267      and N N N N N          ) get instruction
1268      -----------------------
1269      =   B B B B B
1270
1271      And then:
1272      (   B B B B B
1273      or            A A A A A)
1274      -----------------------
1275      =   R R R R R R R R R R  put into bfd_put<size>
1276      */
1277
1278 #define DOIT(x) \
1279   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
1280
1281   data = (bfd_byte *) data_start + (octets - data_start_offset);
1282
1283   switch (howto->size)
1284     {
1285     case 0:
1286       {
1287         char x = bfd_get_8 (abfd, (char *) data);
1288         DOIT (x);
1289         bfd_put_8 (abfd, x, (unsigned char *) data);
1290       }
1291       break;
1292
1293     case 1:
1294       {
1295         short x = bfd_get_16 (abfd, (bfd_byte *) data);
1296         DOIT (x);
1297         bfd_put_16 (abfd, (bfd_vma) x, (unsigned char *) data);
1298       }
1299       break;
1300     case 2:
1301       {
1302         long x = bfd_get_32 (abfd, (bfd_byte *) data);
1303         DOIT (x);
1304         bfd_put_32 (abfd, (bfd_vma) x, (bfd_byte *) data);
1305       }
1306       break;
1307     case -2:
1308       {
1309         long x = bfd_get_32 (abfd, (bfd_byte *) data);
1310         relocation = -relocation;
1311         DOIT (x);
1312         bfd_put_32 (abfd, (bfd_vma) x, (bfd_byte *) data);
1313       }
1314       break;
1315
1316     case 3:
1317       /* Do nothing */
1318       break;
1319
1320     case 4:
1321       {
1322         bfd_vma x = bfd_get_64 (abfd, (bfd_byte *) data);
1323         DOIT (x);
1324         bfd_put_64 (abfd, x, (bfd_byte *) data);
1325       }
1326       break;
1327     default:
1328       return bfd_reloc_other;
1329     }
1330
1331   return flag;
1332 }
1333
1334 /* This relocation routine is used by some of the backend linkers.
1335    They do not construct asymbol or arelent structures, so there is no
1336    reason for them to use bfd_perform_relocation.  Also,
1337    bfd_perform_relocation is so hacked up it is easier to write a new
1338    function than to try to deal with it.
1339
1340    This routine does a final relocation.  Whether it is useful for a
1341    relocateable link depends upon how the object format defines
1342    relocations.
1343
1344    FIXME: This routine ignores any special_function in the HOWTO,
1345    since the existing special_function values have been written for
1346    bfd_perform_relocation.
1347
1348    HOWTO is the reloc howto information.
1349    INPUT_BFD is the BFD which the reloc applies to.
1350    INPUT_SECTION is the section which the reloc applies to.
1351    CONTENTS is the contents of the section.
1352    ADDRESS is the address of the reloc within INPUT_SECTION.
1353    VALUE is the value of the symbol the reloc refers to.
1354    ADDEND is the addend of the reloc.  */
1355
1356 bfd_reloc_status_type
1357 _bfd_final_link_relocate (howto, input_bfd, input_section, contents, address,
1358                           value, addend)
1359      reloc_howto_type *howto;
1360      bfd *input_bfd;
1361      asection *input_section;
1362      bfd_byte *contents;
1363      bfd_vma address;
1364      bfd_vma value;
1365      bfd_vma addend;
1366 {
1367   bfd_vma relocation;
1368
1369   /* Sanity check the address.  */
1370   if (address > input_section->_raw_size)
1371     return bfd_reloc_outofrange;
1372
1373   /* This function assumes that we are dealing with a basic relocation
1374      against a symbol.  We want to compute the value of the symbol to
1375      relocate to.  This is just VALUE, the value of the symbol, plus
1376      ADDEND, any addend associated with the reloc.  */
1377   relocation = value + addend;
1378
1379   /* If the relocation is PC relative, we want to set RELOCATION to
1380      the distance between the symbol (currently in RELOCATION) and the
1381      location we are relocating.  Some targets (e.g., i386-aout)
1382      arrange for the contents of the section to be the negative of the
1383      offset of the location within the section; for such targets
1384      pcrel_offset is false.  Other targets (e.g., m88kbcs or ELF)
1385      simply leave the contents of the section as zero; for such
1386      targets pcrel_offset is true.  If pcrel_offset is false we do not
1387      need to subtract out the offset of the location within the
1388      section (which is just ADDRESS).  */
1389   if (howto->pc_relative)
1390     {
1391       relocation -= (input_section->output_section->vma
1392                      + input_section->output_offset);
1393       if (howto->pcrel_offset)
1394         relocation -= address;
1395     }
1396
1397   return _bfd_relocate_contents (howto, input_bfd, relocation,
1398                                  contents + address);
1399 }
1400
1401 /* Relocate a given location using a given value and howto.  */
1402
1403 bfd_reloc_status_type
1404 _bfd_relocate_contents (howto, input_bfd, relocation, location)
1405      reloc_howto_type *howto;
1406      bfd *input_bfd;
1407      bfd_vma relocation;
1408      bfd_byte *location;
1409 {
1410   int size;
1411   bfd_vma x = 0;
1412   bfd_reloc_status_type flag;
1413   unsigned int rightshift = howto->rightshift;
1414   unsigned int bitpos = howto->bitpos;
1415
1416   /* If the size is negative, negate RELOCATION.  This isn't very
1417      general.  */
1418   if (howto->size < 0)
1419     relocation = -relocation;
1420
1421   /* Get the value we are going to relocate.  */
1422   size = bfd_get_reloc_size (howto);
1423   switch (size)
1424     {
1425     default:
1426     case 0:
1427       abort ();
1428     case 1:
1429       x = bfd_get_8 (input_bfd, location);
1430       break;
1431     case 2:
1432       x = bfd_get_16 (input_bfd, location);
1433       break;
1434     case 4:
1435       x = bfd_get_32 (input_bfd, location);
1436       break;
1437     case 8:
1438 #ifdef BFD64
1439       x = bfd_get_64 (input_bfd, location);
1440 #else
1441       abort ();
1442 #endif
1443       break;
1444     }
1445
1446   /* Check for overflow.  FIXME: We may drop bits during the addition
1447      which we don't check for.  We must either check at every single
1448      operation, which would be tedious, or we must do the computations
1449      in a type larger than bfd_vma, which would be inefficient.  */
1450   flag = bfd_reloc_ok;
1451   if (howto->complain_on_overflow != complain_overflow_dont)
1452     {
1453       bfd_vma addrmask, fieldmask, signmask, ss;
1454       bfd_vma a, b, sum;
1455
1456       /* Get the values to be added together.  For signed and unsigned
1457          relocations, we assume that all values should be truncated to
1458          the size of an address.  For bitfields, all the bits matter.
1459          See also bfd_check_overflow.  */
1460       fieldmask = N_ONES (howto->bitsize);
1461       addrmask = N_ONES (bfd_arch_bits_per_address (input_bfd)) | fieldmask;
1462       a = relocation;
1463       b = x & howto->src_mask;
1464
1465       switch (howto->complain_on_overflow)
1466         {
1467         case complain_overflow_signed:
1468           a = (a & addrmask) >> rightshift;
1469
1470           /* If any sign bits are set, all sign bits must be set.
1471              That is, A must be a valid negative address after
1472              shifting.  */
1473           signmask = ~ (fieldmask >> 1);
1474           ss = a & signmask;
1475           if (ss != 0 && ss != ((addrmask >> rightshift) & signmask))
1476             flag = bfd_reloc_overflow;
1477
1478           /* We only need this next bit of code if the sign bit of B
1479              is below the sign bit of A.  This would only happen if
1480              SRC_MASK had fewer bits than BITSIZE.  Note that if
1481              SRC_MASK has more bits than BITSIZE, we can get into
1482              trouble; we would need to verify that B is in range, as
1483              we do for A above.  */
1484           signmask = ((~ howto->src_mask) >> 1) & howto->src_mask;
1485
1486           /* Set all the bits above the sign bit.  */
1487           b = (b ^ signmask) - signmask;
1488
1489           b = (b & addrmask) >> bitpos;
1490
1491           /* Now we can do the addition.  */
1492           sum = a + b;
1493
1494           /* See if the result has the correct sign.  Bits above the
1495              sign bit are junk now; ignore them.  If the sum is
1496              positive, make sure we did not have all negative inputs;
1497              if the sum is negative, make sure we did not have all
1498              positive inputs.  The test below looks only at the sign
1499              bits, and it really just
1500                  SIGN (A) == SIGN (B) && SIGN (A) != SIGN (SUM)
1501              */
1502           signmask = (fieldmask >> 1) + 1;
1503           if (((~ (a ^ b)) & (a ^ sum)) & signmask)
1504             flag = bfd_reloc_overflow;
1505
1506           break;
1507
1508         case complain_overflow_unsigned:
1509           /* Checking for an unsigned overflow is relatively easy:
1510              trim the addresses and add, and trim the result as well.
1511              Overflow is normally indicated when the result does not
1512              fit in the field.  However, we also need to consider the
1513              case when, e.g., fieldmask is 0x7fffffff or smaller, an
1514              input is 0x80000000, and bfd_vma is only 32 bits; then we
1515              will get sum == 0, but there is an overflow, since the
1516              inputs did not fit in the field.  Instead of doing a
1517              separate test, we can check for this by or-ing in the
1518              operands when testing for the sum overflowing its final
1519              field.  */
1520           a = (a & addrmask) >> rightshift;
1521           b = (b & addrmask) >> bitpos;
1522           sum = (a + b) & addrmask;
1523           if ((a | b | sum) & ~ fieldmask)
1524             flag = bfd_reloc_overflow;
1525
1526           break;
1527
1528         case complain_overflow_bitfield:
1529           /* Much like the signed check, but for a field one bit
1530              wider, and no trimming inputs with addrmask.  We allow a
1531              bitfield to represent numbers in the range -2**n to
1532              2**n-1, where n is the number of bits in the field.
1533              Note that when bfd_vma is 32 bits, a 32-bit reloc can't
1534              overflow, which is exactly what we want.  */
1535           a >>= rightshift;
1536
1537           signmask = ~ fieldmask;
1538           ss = a & signmask;
1539           if (ss != 0 && ss != (((bfd_vma) -1 >> rightshift) & signmask))
1540             flag = bfd_reloc_overflow;
1541
1542           signmask = ((~ howto->src_mask) >> 1) & howto->src_mask;
1543           b = (b ^ signmask) - signmask;
1544
1545           b >>= bitpos;
1546
1547           sum = a + b;
1548
1549           /* We mask with addrmask here to explicitly allow an address
1550              wrap-around.  The Linux kernel relies on it, and it is
1551              the only way to write assembler code which can run when
1552              loaded at a location 0x80000000 away from the location at
1553              which it is linked.  */
1554           signmask = fieldmask + 1;
1555           if (((~ (a ^ b)) & (a ^ sum)) & signmask & addrmask)
1556             flag = bfd_reloc_overflow;
1557
1558           break;
1559
1560         default:
1561           abort ();
1562         }
1563     }
1564
1565   /* Put RELOCATION in the right bits.  */
1566   relocation >>= (bfd_vma) rightshift;
1567   relocation <<= (bfd_vma) bitpos;
1568
1569   /* Add RELOCATION to the right bits of X.  */
1570   x = ((x & ~howto->dst_mask)
1571        | (((x & howto->src_mask) + relocation) & howto->dst_mask));
1572
1573   /* Put the relocated value back in the object file.  */
1574   switch (size)
1575     {
1576     default:
1577     case 0:
1578       abort ();
1579     case 1:
1580       bfd_put_8 (input_bfd, x, location);
1581       break;
1582     case 2:
1583       bfd_put_16 (input_bfd, x, location);
1584       break;
1585     case 4:
1586       bfd_put_32 (input_bfd, x, location);
1587       break;
1588     case 8:
1589 #ifdef BFD64
1590       bfd_put_64 (input_bfd, x, location);
1591 #else
1592       abort ();
1593 #endif
1594       break;
1595     }
1596
1597   return flag;
1598 }
1599
1600 /*
1601 DOCDD
1602 INODE
1603         howto manager,  , typedef arelent, Relocations
1604
1605 SECTION
1606         The howto manager
1607
1608         When an application wants to create a relocation, but doesn't
1609         know what the target machine might call it, it can find out by
1610         using this bit of code.
1611
1612 */
1613
1614 /*
1615 TYPEDEF
1616         bfd_reloc_code_type
1617
1618 DESCRIPTION
1619         The insides of a reloc code.  The idea is that, eventually, there
1620         will be one enumerator for every type of relocation we ever do.
1621         Pass one of these values to <<bfd_reloc_type_lookup>>, and it'll
1622         return a howto pointer.
1623
1624         This does mean that the application must determine the correct
1625         enumerator value; you can't get a howto pointer from a random set
1626         of attributes.
1627
1628 SENUM
1629    bfd_reloc_code_real
1630
1631 ENUM
1632   BFD_RELOC_64
1633 ENUMX
1634   BFD_RELOC_32
1635 ENUMX
1636   BFD_RELOC_26
1637 ENUMX
1638   BFD_RELOC_24
1639 ENUMX
1640   BFD_RELOC_16
1641 ENUMX
1642   BFD_RELOC_14
1643 ENUMX
1644   BFD_RELOC_8
1645 ENUMDOC
1646   Basic absolute relocations of N bits.
1647
1648 ENUM
1649   BFD_RELOC_64_PCREL
1650 ENUMX
1651   BFD_RELOC_32_PCREL
1652 ENUMX
1653   BFD_RELOC_24_PCREL
1654 ENUMX
1655   BFD_RELOC_16_PCREL
1656 ENUMX
1657   BFD_RELOC_12_PCREL
1658 ENUMX
1659   BFD_RELOC_8_PCREL
1660 ENUMDOC
1661   PC-relative relocations.  Sometimes these are relative to the address
1662 of the relocation itself; sometimes they are relative to the start of
1663 the section containing the relocation.  It depends on the specific target.
1664
1665 The 24-bit relocation is used in some Intel 960 configurations.
1666
1667 ENUM
1668   BFD_RELOC_32_GOT_PCREL
1669 ENUMX
1670   BFD_RELOC_16_GOT_PCREL
1671 ENUMX
1672   BFD_RELOC_8_GOT_PCREL
1673 ENUMX
1674   BFD_RELOC_32_GOTOFF
1675 ENUMX
1676   BFD_RELOC_16_GOTOFF
1677 ENUMX
1678   BFD_RELOC_LO16_GOTOFF
1679 ENUMX
1680   BFD_RELOC_HI16_GOTOFF
1681 ENUMX
1682   BFD_RELOC_HI16_S_GOTOFF
1683 ENUMX
1684   BFD_RELOC_8_GOTOFF
1685 ENUMX
1686   BFD_RELOC_64_PLT_PCREL
1687 ENUMX
1688   BFD_RELOC_32_PLT_PCREL
1689 ENUMX
1690   BFD_RELOC_24_PLT_PCREL
1691 ENUMX
1692   BFD_RELOC_16_PLT_PCREL
1693 ENUMX
1694   BFD_RELOC_8_PLT_PCREL
1695 ENUMX
1696   BFD_RELOC_64_PLTOFF
1697 ENUMX
1698   BFD_RELOC_32_PLTOFF
1699 ENUMX
1700   BFD_RELOC_16_PLTOFF
1701 ENUMX
1702   BFD_RELOC_LO16_PLTOFF
1703 ENUMX
1704   BFD_RELOC_HI16_PLTOFF
1705 ENUMX
1706   BFD_RELOC_HI16_S_PLTOFF
1707 ENUMX
1708   BFD_RELOC_8_PLTOFF
1709 ENUMDOC
1710   For ELF.
1711
1712 ENUM
1713   BFD_RELOC_68K_GLOB_DAT
1714 ENUMX
1715   BFD_RELOC_68K_JMP_SLOT
1716 ENUMX
1717   BFD_RELOC_68K_RELATIVE
1718 ENUMDOC
1719   Relocations used by 68K ELF.
1720
1721 ENUM
1722   BFD_RELOC_32_BASEREL
1723 ENUMX
1724   BFD_RELOC_16_BASEREL
1725 ENUMX
1726   BFD_RELOC_LO16_BASEREL
1727 ENUMX
1728   BFD_RELOC_HI16_BASEREL
1729 ENUMX
1730   BFD_RELOC_HI16_S_BASEREL
1731 ENUMX
1732   BFD_RELOC_8_BASEREL
1733 ENUMX
1734   BFD_RELOC_RVA
1735 ENUMDOC
1736   Linkage-table relative.
1737
1738 ENUM
1739   BFD_RELOC_8_FFnn
1740 ENUMDOC
1741   Absolute 8-bit relocation, but used to form an address like 0xFFnn.
1742
1743 ENUM
1744   BFD_RELOC_32_PCREL_S2
1745 ENUMX
1746   BFD_RELOC_16_PCREL_S2
1747 ENUMX
1748   BFD_RELOC_23_PCREL_S2
1749 ENUMDOC
1750   These PC-relative relocations are stored as word displacements --
1751 i.e., byte displacements shifted right two bits.  The 30-bit word
1752 displacement (<<32_PCREL_S2>> -- 32 bits, shifted 2) is used on the
1753 SPARC.  (SPARC tools generally refer to this as <<WDISP30>>.)  The
1754 signed 16-bit displacement is used on the MIPS, and the 23-bit
1755 displacement is used on the Alpha.
1756
1757 ENUM
1758   BFD_RELOC_HI22
1759 ENUMX
1760   BFD_RELOC_LO10
1761 ENUMDOC
1762   High 22 bits and low 10 bits of 32-bit value, placed into lower bits of
1763 the target word.  These are used on the SPARC.
1764
1765 ENUM
1766   BFD_RELOC_GPREL16
1767 ENUMX
1768   BFD_RELOC_GPREL32
1769 ENUMDOC
1770   For systems that allocate a Global Pointer register, these are
1771 displacements off that register.  These relocation types are
1772 handled specially, because the value the register will have is
1773 decided relatively late.
1774
1775 ENUM
1776   BFD_RELOC_I960_CALLJ
1777 ENUMDOC
1778   Reloc types used for i960/b.out.
1779
1780 ENUM
1781   BFD_RELOC_NONE
1782 ENUMX
1783   BFD_RELOC_SPARC_WDISP22
1784 ENUMX
1785   BFD_RELOC_SPARC22
1786 ENUMX
1787   BFD_RELOC_SPARC13
1788 ENUMX
1789   BFD_RELOC_SPARC_GOT10
1790 ENUMX
1791   BFD_RELOC_SPARC_GOT13
1792 ENUMX
1793   BFD_RELOC_SPARC_GOT22
1794 ENUMX
1795   BFD_RELOC_SPARC_PC10
1796 ENUMX
1797   BFD_RELOC_SPARC_PC22
1798 ENUMX
1799   BFD_RELOC_SPARC_WPLT30
1800 ENUMX
1801   BFD_RELOC_SPARC_COPY
1802 ENUMX
1803   BFD_RELOC_SPARC_GLOB_DAT
1804 ENUMX
1805   BFD_RELOC_SPARC_JMP_SLOT
1806 ENUMX
1807   BFD_RELOC_SPARC_RELATIVE
1808 ENUMX
1809   BFD_RELOC_SPARC_UA16
1810 ENUMX
1811   BFD_RELOC_SPARC_UA32
1812 ENUMX
1813   BFD_RELOC_SPARC_UA64
1814 ENUMDOC
1815   SPARC ELF relocations.  There is probably some overlap with other
1816   relocation types already defined.
1817
1818 ENUM
1819   BFD_RELOC_SPARC_BASE13
1820 ENUMX
1821   BFD_RELOC_SPARC_BASE22
1822 ENUMDOC
1823   I think these are specific to SPARC a.out (e.g., Sun 4).
1824
1825 ENUMEQ
1826   BFD_RELOC_SPARC_64
1827   BFD_RELOC_64
1828 ENUMX
1829   BFD_RELOC_SPARC_10
1830 ENUMX
1831   BFD_RELOC_SPARC_11
1832 ENUMX
1833   BFD_RELOC_SPARC_OLO10
1834 ENUMX
1835   BFD_RELOC_SPARC_HH22
1836 ENUMX
1837   BFD_RELOC_SPARC_HM10
1838 ENUMX
1839   BFD_RELOC_SPARC_LM22
1840 ENUMX
1841   BFD_RELOC_SPARC_PC_HH22
1842 ENUMX
1843   BFD_RELOC_SPARC_PC_HM10
1844 ENUMX
1845   BFD_RELOC_SPARC_PC_LM22
1846 ENUMX
1847   BFD_RELOC_SPARC_WDISP16
1848 ENUMX
1849   BFD_RELOC_SPARC_WDISP19
1850 ENUMX
1851   BFD_RELOC_SPARC_7
1852 ENUMX
1853   BFD_RELOC_SPARC_6
1854 ENUMX
1855   BFD_RELOC_SPARC_5
1856 ENUMEQX
1857   BFD_RELOC_SPARC_DISP64
1858   BFD_RELOC_64_PCREL
1859 ENUMX
1860   BFD_RELOC_SPARC_PLT64
1861 ENUMX
1862   BFD_RELOC_SPARC_HIX22
1863 ENUMX
1864   BFD_RELOC_SPARC_LOX10
1865 ENUMX
1866   BFD_RELOC_SPARC_H44
1867 ENUMX
1868   BFD_RELOC_SPARC_M44
1869 ENUMX
1870   BFD_RELOC_SPARC_L44
1871 ENUMX
1872   BFD_RELOC_SPARC_REGISTER
1873 ENUMDOC
1874   SPARC64 relocations
1875
1876 ENUM
1877   BFD_RELOC_SPARC_REV32
1878 ENUMDOC
1879   SPARC little endian relocation
1880
1881 ENUM
1882   BFD_RELOC_ALPHA_GPDISP_HI16
1883 ENUMDOC
1884   Alpha ECOFF and ELF relocations.  Some of these treat the symbol or
1885      "addend" in some special way.
1886   For GPDISP_HI16 ("gpdisp") relocations, the symbol is ignored when
1887      writing; when reading, it will be the absolute section symbol.  The
1888      addend is the displacement in bytes of the "lda" instruction from
1889      the "ldah" instruction (which is at the address of this reloc).
1890 ENUM
1891   BFD_RELOC_ALPHA_GPDISP_LO16
1892 ENUMDOC
1893   For GPDISP_LO16 ("ignore") relocations, the symbol is handled as
1894      with GPDISP_HI16 relocs.  The addend is ignored when writing the
1895      relocations out, and is filled in with the file's GP value on
1896      reading, for convenience.
1897
1898 ENUM
1899   BFD_RELOC_ALPHA_GPDISP
1900 ENUMDOC
1901   The ELF GPDISP relocation is exactly the same as the GPDISP_HI16
1902      relocation except that there is no accompanying GPDISP_LO16
1903      relocation.
1904
1905 ENUM
1906   BFD_RELOC_ALPHA_LITERAL
1907 ENUMX
1908   BFD_RELOC_ALPHA_ELF_LITERAL
1909 ENUMX
1910   BFD_RELOC_ALPHA_LITUSE
1911 ENUMDOC
1912   The Alpha LITERAL/LITUSE relocs are produced by a symbol reference;
1913      the assembler turns it into a LDQ instruction to load the address of
1914      the symbol, and then fills in a register in the real instruction.
1915
1916      The LITERAL reloc, at the LDQ instruction, refers to the .lita
1917      section symbol.  The addend is ignored when writing, but is filled
1918      in with the file's GP value on reading, for convenience, as with the
1919      GPDISP_LO16 reloc.
1920
1921      The ELF_LITERAL reloc is somewhere between 16_GOTOFF and GPDISP_LO16.
1922      It should refer to the symbol to be referenced, as with 16_GOTOFF,
1923      but it generates output not based on the position within the .got
1924      section, but relative to the GP value chosen for the file during the
1925      final link stage.
1926
1927      The LITUSE reloc, on the instruction using the loaded address, gives
1928      information to the linker that it might be able to use to optimize
1929      away some literal section references.  The symbol is ignored (read
1930      as the absolute section symbol), and the "addend" indicates the type
1931      of instruction using the register:
1932               1 - "memory" fmt insn
1933               2 - byte-manipulation (byte offset reg)
1934               3 - jsr (target of branch)
1935
1936 ENUM
1937   BFD_RELOC_ALPHA_HINT
1938 ENUMDOC
1939   The HINT relocation indicates a value that should be filled into the
1940      "hint" field of a jmp/jsr/ret instruction, for possible branch-
1941      prediction logic which may be provided on some processors.
1942
1943 ENUM
1944   BFD_RELOC_ALPHA_LINKAGE
1945 ENUMDOC
1946   The LINKAGE relocation outputs a linkage pair in the object file,
1947      which is filled by the linker.
1948
1949 ENUM
1950   BFD_RELOC_ALPHA_CODEADDR
1951 ENUMDOC
1952   The CODEADDR relocation outputs a STO_CA in the object file,
1953      which is filled by the linker.
1954
1955 ENUM
1956   BFD_RELOC_ALPHA_GPREL_HI16
1957 ENUMX
1958   BFD_RELOC_ALPHA_GPREL_LO16
1959 ENUMDOC
1960   The GPREL_HI/LO relocations together form a 32-bit offset from the
1961      GP register.
1962
1963 ENUM
1964   BFD_RELOC_MIPS_JMP
1965 ENUMDOC
1966   Bits 27..2 of the relocation address shifted right 2 bits;
1967      simple reloc otherwise.
1968
1969 ENUM
1970   BFD_RELOC_MIPS16_JMP
1971 ENUMDOC
1972   The MIPS16 jump instruction.
1973
1974 ENUM
1975   BFD_RELOC_MIPS16_GPREL
1976 ENUMDOC
1977   MIPS16 GP relative reloc.
1978
1979 ENUM
1980   BFD_RELOC_HI16
1981 ENUMDOC
1982   High 16 bits of 32-bit value; simple reloc.
1983 ENUM
1984   BFD_RELOC_HI16_S
1985 ENUMDOC
1986   High 16 bits of 32-bit value but the low 16 bits will be sign
1987      extended and added to form the final result.  If the low 16
1988      bits form a negative number, we need to add one to the high value
1989      to compensate for the borrow when the low bits are added.
1990 ENUM
1991   BFD_RELOC_LO16
1992 ENUMDOC
1993   Low 16 bits.
1994 ENUM
1995   BFD_RELOC_PCREL_HI16_S
1996 ENUMDOC
1997   Like BFD_RELOC_HI16_S, but PC relative.
1998 ENUM
1999   BFD_RELOC_PCREL_LO16
2000 ENUMDOC
2001   Like BFD_RELOC_LO16, but PC relative.
2002
2003 ENUM
2004   BFD_RELOC_MIPS_LITERAL
2005 ENUMDOC
2006   Relocation against a MIPS literal section.
2007
2008 ENUM
2009   BFD_RELOC_MIPS_GOT16
2010 ENUMX
2011   BFD_RELOC_MIPS_CALL16
2012 ENUMX
2013   BFD_RELOC_MIPS_GOT_HI16
2014 ENUMX
2015   BFD_RELOC_MIPS_GOT_LO16
2016 ENUMX
2017   BFD_RELOC_MIPS_CALL_HI16
2018 ENUMX
2019   BFD_RELOC_MIPS_CALL_LO16
2020 ENUMX
2021   BFD_RELOC_MIPS_SUB
2022 ENUMX
2023   BFD_RELOC_MIPS_GOT_PAGE
2024 ENUMX
2025   BFD_RELOC_MIPS_GOT_OFST
2026 ENUMX
2027   BFD_RELOC_MIPS_GOT_DISP
2028 ENUMX
2029   BFD_RELOC_MIPS_SHIFT5
2030 ENUMX
2031   BFD_RELOC_MIPS_SHIFT6
2032 ENUMX
2033   BFD_RELOC_MIPS_INSERT_A
2034 ENUMX
2035   BFD_RELOC_MIPS_INSERT_B
2036 ENUMX
2037   BFD_RELOC_MIPS_DELETE
2038 ENUMX
2039   BFD_RELOC_MIPS_HIGHEST
2040 ENUMX
2041   BFD_RELOC_MIPS_HIGHER
2042 ENUMX
2043   BFD_RELOC_MIPS_SCN_DISP
2044 ENUMX
2045   BFD_RELOC_MIPS_REL16
2046 ENUMX
2047   BFD_RELOC_MIPS_RELGOT
2048 ENUMX
2049   BFD_RELOC_MIPS_JALR
2050 COMMENT
2051 ENUMDOC
2052   MIPS ELF relocations.
2053
2054 COMMENT
2055
2056 ENUM
2057   BFD_RELOC_386_GOT32
2058 ENUMX
2059   BFD_RELOC_386_PLT32
2060 ENUMX
2061   BFD_RELOC_386_COPY
2062 ENUMX
2063   BFD_RELOC_386_GLOB_DAT
2064 ENUMX
2065   BFD_RELOC_386_JUMP_SLOT
2066 ENUMX
2067   BFD_RELOC_386_RELATIVE
2068 ENUMX
2069   BFD_RELOC_386_GOTOFF
2070 ENUMX
2071   BFD_RELOC_386_GOTPC
2072 ENUMDOC
2073   i386/elf relocations
2074
2075 ENUM
2076   BFD_RELOC_X86_64_GOT32
2077 ENUMX
2078   BFD_RELOC_X86_64_PLT32
2079 ENUMX
2080   BFD_RELOC_X86_64_COPY
2081 ENUMX
2082   BFD_RELOC_X86_64_GLOB_DAT
2083 ENUMX
2084   BFD_RELOC_X86_64_JUMP_SLOT
2085 ENUMX
2086   BFD_RELOC_X86_64_RELATIVE
2087 ENUMX
2088   BFD_RELOC_X86_64_GOTPCREL
2089 ENUMX
2090   BFD_RELOC_X86_64_32S
2091 ENUMDOC
2092   x86-64/elf relocations
2093
2094 ENUM
2095   BFD_RELOC_NS32K_IMM_8
2096 ENUMX
2097   BFD_RELOC_NS32K_IMM_16
2098 ENUMX
2099   BFD_RELOC_NS32K_IMM_32
2100 ENUMX
2101   BFD_RELOC_NS32K_IMM_8_PCREL
2102 ENUMX
2103   BFD_RELOC_NS32K_IMM_16_PCREL
2104 ENUMX
2105   BFD_RELOC_NS32K_IMM_32_PCREL
2106 ENUMX
2107   BFD_RELOC_NS32K_DISP_8
2108 ENUMX
2109   BFD_RELOC_NS32K_DISP_16
2110 ENUMX
2111   BFD_RELOC_NS32K_DISP_32
2112 ENUMX
2113   BFD_RELOC_NS32K_DISP_8_PCREL
2114 ENUMX
2115   BFD_RELOC_NS32K_DISP_16_PCREL
2116 ENUMX
2117   BFD_RELOC_NS32K_DISP_32_PCREL
2118 ENUMDOC
2119   ns32k relocations
2120
2121 ENUM
2122   BFD_RELOC_PDP11_DISP_8_PCREL
2123 ENUMX
2124   BFD_RELOC_PDP11_DISP_6_PCREL
2125 ENUMDOC
2126   PDP11 relocations
2127
2128 ENUM
2129   BFD_RELOC_PJ_CODE_HI16
2130 ENUMX
2131   BFD_RELOC_PJ_CODE_LO16
2132 ENUMX
2133   BFD_RELOC_PJ_CODE_DIR16
2134 ENUMX
2135   BFD_RELOC_PJ_CODE_DIR32
2136 ENUMX
2137   BFD_RELOC_PJ_CODE_REL16
2138 ENUMX
2139   BFD_RELOC_PJ_CODE_REL32
2140 ENUMDOC
2141   Picojava relocs.  Not all of these appear in object files.
2142
2143 ENUM
2144   BFD_RELOC_PPC_B26
2145 ENUMX
2146   BFD_RELOC_PPC_BA26
2147 ENUMX
2148   BFD_RELOC_PPC_TOC16
2149 ENUMX
2150   BFD_RELOC_PPC_B16
2151 ENUMX
2152   BFD_RELOC_PPC_B16_BRTAKEN
2153 ENUMX
2154   BFD_RELOC_PPC_B16_BRNTAKEN
2155 ENUMX
2156   BFD_RELOC_PPC_BA16
2157 ENUMX
2158   BFD_RELOC_PPC_BA16_BRTAKEN
2159 ENUMX
2160   BFD_RELOC_PPC_BA16_BRNTAKEN
2161 ENUMX
2162   BFD_RELOC_PPC_COPY
2163 ENUMX
2164   BFD_RELOC_PPC_GLOB_DAT
2165 ENUMX
2166   BFD_RELOC_PPC_JMP_SLOT
2167 ENUMX
2168   BFD_RELOC_PPC_RELATIVE
2169 ENUMX
2170   BFD_RELOC_PPC_LOCAL24PC
2171 ENUMX
2172   BFD_RELOC_PPC_EMB_NADDR32
2173 ENUMX
2174   BFD_RELOC_PPC_EMB_NADDR16
2175 ENUMX
2176   BFD_RELOC_PPC_EMB_NADDR16_LO
2177 ENUMX
2178   BFD_RELOC_PPC_EMB_NADDR16_HI
2179 ENUMX
2180   BFD_RELOC_PPC_EMB_NADDR16_HA
2181 ENUMX
2182   BFD_RELOC_PPC_EMB_SDAI16
2183 ENUMX
2184   BFD_RELOC_PPC_EMB_SDA2I16
2185 ENUMX
2186   BFD_RELOC_PPC_EMB_SDA2REL
2187 ENUMX
2188   BFD_RELOC_PPC_EMB_SDA21
2189 ENUMX
2190   BFD_RELOC_PPC_EMB_MRKREF
2191 ENUMX
2192   BFD_RELOC_PPC_EMB_RELSEC16
2193 ENUMX
2194   BFD_RELOC_PPC_EMB_RELST_LO
2195 ENUMX
2196   BFD_RELOC_PPC_EMB_RELST_HI
2197 ENUMX
2198   BFD_RELOC_PPC_EMB_RELST_HA
2199 ENUMX
2200   BFD_RELOC_PPC_EMB_BIT_FLD
2201 ENUMX
2202   BFD_RELOC_PPC_EMB_RELSDA
2203 ENUMX
2204   BFD_RELOC_PPC64_HIGHER
2205 ENUMX
2206   BFD_RELOC_PPC64_HIGHER_S
2207 ENUMX
2208   BFD_RELOC_PPC64_HIGHEST
2209 ENUMX
2210   BFD_RELOC_PPC64_HIGHEST_S
2211 ENUMX
2212   BFD_RELOC_PPC64_TOC16_LO
2213 ENUMX
2214   BFD_RELOC_PPC64_TOC16_HI
2215 ENUMX
2216   BFD_RELOC_PPC64_TOC16_HA
2217 ENUMX
2218   BFD_RELOC_PPC64_TOC
2219 ENUMX
2220   BFD_RELOC_PPC64_PLTGOT16
2221 ENUMX
2222   BFD_RELOC_PPC64_PLTGOT16_LO
2223 ENUMX
2224   BFD_RELOC_PPC64_PLTGOT16_HI
2225 ENUMX
2226   BFD_RELOC_PPC64_PLTGOT16_HA
2227 ENUMX
2228   BFD_RELOC_PPC64_ADDR16_DS
2229 ENUMX
2230   BFD_RELOC_PPC64_ADDR16_LO_DS
2231 ENUMX
2232   BFD_RELOC_PPC64_GOT16_DS
2233 ENUMX
2234   BFD_RELOC_PPC64_GOT16_LO_DS
2235 ENUMX
2236   BFD_RELOC_PPC64_PLT16_LO_DS
2237 ENUMX
2238   BFD_RELOC_PPC64_SECTOFF_DS
2239 ENUMX
2240   BFD_RELOC_PPC64_SECTOFF_LO_DS
2241 ENUMX
2242   BFD_RELOC_PPC64_TOC16_DS
2243 ENUMX
2244   BFD_RELOC_PPC64_TOC16_LO_DS
2245 ENUMX
2246   BFD_RELOC_PPC64_PLTGOT16_DS
2247 ENUMX
2248   BFD_RELOC_PPC64_PLTGOT16_LO_DS
2249 ENUMDOC
2250   Power(rs6000) and PowerPC relocations.
2251
2252 ENUM
2253   BFD_RELOC_I370_D12
2254 ENUMDOC
2255   IBM 370/390 relocations
2256
2257 ENUM
2258   BFD_RELOC_CTOR
2259 ENUMDOC
2260   The type of reloc used to build a contructor table - at the moment
2261   probably a 32 bit wide absolute relocation, but the target can choose.
2262   It generally does map to one of the other relocation types.
2263
2264 ENUM
2265   BFD_RELOC_ARM_PCREL_BRANCH
2266 ENUMDOC
2267   ARM 26 bit pc-relative branch.  The lowest two bits must be zero and are
2268   not stored in the instruction.
2269 ENUM
2270   BFD_RELOC_ARM_PCREL_BLX
2271 ENUMDOC
2272   ARM 26 bit pc-relative branch.  The lowest bit must be zero and is
2273   not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
2274   field in the instruction.
2275 ENUM
2276   BFD_RELOC_THUMB_PCREL_BLX
2277 ENUMDOC
2278   Thumb 22 bit pc-relative branch.  The lowest bit must be zero and is
2279   not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
2280   field in the instruction.
2281 ENUM
2282   BFD_RELOC_ARM_IMMEDIATE
2283 ENUMX
2284   BFD_RELOC_ARM_ADRL_IMMEDIATE
2285 ENUMX
2286   BFD_RELOC_ARM_OFFSET_IMM
2287 ENUMX
2288   BFD_RELOC_ARM_SHIFT_IMM
2289 ENUMX
2290   BFD_RELOC_ARM_SWI
2291 ENUMX
2292   BFD_RELOC_ARM_MULTI
2293 ENUMX
2294   BFD_RELOC_ARM_CP_OFF_IMM
2295 ENUMX
2296   BFD_RELOC_ARM_ADR_IMM
2297 ENUMX
2298   BFD_RELOC_ARM_LDR_IMM
2299 ENUMX
2300   BFD_RELOC_ARM_LITERAL
2301 ENUMX
2302   BFD_RELOC_ARM_IN_POOL
2303 ENUMX
2304   BFD_RELOC_ARM_OFFSET_IMM8
2305 ENUMX
2306   BFD_RELOC_ARM_HWLITERAL
2307 ENUMX
2308   BFD_RELOC_ARM_THUMB_ADD
2309 ENUMX
2310   BFD_RELOC_ARM_THUMB_IMM
2311 ENUMX
2312   BFD_RELOC_ARM_THUMB_SHIFT
2313 ENUMX
2314   BFD_RELOC_ARM_THUMB_OFFSET
2315 ENUMX
2316   BFD_RELOC_ARM_GOT12
2317 ENUMX
2318   BFD_RELOC_ARM_GOT32
2319 ENUMX
2320   BFD_RELOC_ARM_JUMP_SLOT
2321 ENUMX
2322   BFD_RELOC_ARM_COPY
2323 ENUMX
2324   BFD_RELOC_ARM_GLOB_DAT
2325 ENUMX
2326   BFD_RELOC_ARM_PLT32
2327 ENUMX
2328   BFD_RELOC_ARM_RELATIVE
2329 ENUMX
2330   BFD_RELOC_ARM_GOTOFF
2331 ENUMX
2332   BFD_RELOC_ARM_GOTPC
2333 ENUMDOC
2334   These relocs are only used within the ARM assembler.  They are not
2335   (at present) written to any object files.
2336
2337 ENUM
2338   BFD_RELOC_SH_PCDISP8BY2
2339 ENUMX
2340   BFD_RELOC_SH_PCDISP12BY2
2341 ENUMX
2342   BFD_RELOC_SH_IMM4
2343 ENUMX
2344   BFD_RELOC_SH_IMM4BY2
2345 ENUMX
2346   BFD_RELOC_SH_IMM4BY4
2347 ENUMX
2348   BFD_RELOC_SH_IMM8
2349 ENUMX
2350   BFD_RELOC_SH_IMM8BY2
2351 ENUMX
2352   BFD_RELOC_SH_IMM8BY4
2353 ENUMX
2354   BFD_RELOC_SH_PCRELIMM8BY2
2355 ENUMX
2356   BFD_RELOC_SH_PCRELIMM8BY4
2357 ENUMX
2358   BFD_RELOC_SH_SWITCH16
2359 ENUMX
2360   BFD_RELOC_SH_SWITCH32
2361 ENUMX
2362   BFD_RELOC_SH_USES
2363 ENUMX
2364   BFD_RELOC_SH_COUNT
2365 ENUMX
2366   BFD_RELOC_SH_ALIGN
2367 ENUMX
2368   BFD_RELOC_SH_CODE
2369 ENUMX
2370   BFD_RELOC_SH_DATA
2371 ENUMX
2372   BFD_RELOC_SH_LABEL
2373 ENUMX
2374   BFD_RELOC_SH_LOOP_START
2375 ENUMX
2376   BFD_RELOC_SH_LOOP_END
2377 ENUMX
2378   BFD_RELOC_SH_COPY
2379 ENUMX
2380   BFD_RELOC_SH_GLOB_DAT
2381 ENUMX
2382   BFD_RELOC_SH_JMP_SLOT
2383 ENUMX
2384   BFD_RELOC_SH_RELATIVE
2385 ENUMX
2386   BFD_RELOC_SH_GOTPC
2387 ENUMDOC
2388   Hitachi SH relocs.  Not all of these appear in object files.
2389
2390 ENUM
2391   BFD_RELOC_THUMB_PCREL_BRANCH9
2392 ENUMX
2393   BFD_RELOC_THUMB_PCREL_BRANCH12
2394 ENUMX
2395   BFD_RELOC_THUMB_PCREL_BRANCH23
2396 ENUMDOC
2397   Thumb 23-, 12- and 9-bit pc-relative branches.  The lowest bit must
2398   be zero and is not stored in the instruction.
2399
2400 ENUM
2401   BFD_RELOC_ARC_B22_PCREL
2402 ENUMDOC
2403   ARC Cores relocs.
2404   ARC 22 bit pc-relative branch.  The lowest two bits must be zero and are
2405   not stored in the instruction.  The high 20 bits are installed in bits 26
2406   through 7 of the instruction.
2407 ENUM
2408   BFD_RELOC_ARC_B26
2409 ENUMDOC
2410   ARC 26 bit absolute branch.  The lowest two bits must be zero and are not
2411   stored in the instruction.  The high 24 bits are installed in bits 23
2412   through 0.
2413
2414 ENUM
2415   BFD_RELOC_D10V_10_PCREL_R
2416 ENUMDOC
2417   Mitsubishi D10V relocs.
2418   This is a 10-bit reloc with the right 2 bits
2419   assumed to be 0.
2420 ENUM
2421   BFD_RELOC_D10V_10_PCREL_L
2422 ENUMDOC
2423   Mitsubishi D10V relocs.
2424   This is a 10-bit reloc with the right 2 bits
2425   assumed to be 0.  This is the same as the previous reloc
2426   except it is in the left container, i.e.,
2427   shifted left 15 bits.
2428 ENUM
2429   BFD_RELOC_D10V_18
2430 ENUMDOC
2431   This is an 18-bit reloc with the right 2 bits
2432   assumed to be 0.
2433 ENUM
2434   BFD_RELOC_D10V_18_PCREL
2435 ENUMDOC
2436   This is an 18-bit reloc with the right 2 bits
2437   assumed to be 0.
2438
2439 ENUM
2440   BFD_RELOC_D30V_6
2441 ENUMDOC
2442   Mitsubishi D30V relocs.
2443   This is a 6-bit absolute reloc.
2444 ENUM
2445   BFD_RELOC_D30V_9_PCREL
2446 ENUMDOC
2447   This is a 6-bit pc-relative reloc with
2448   the right 3 bits assumed to be 0.
2449 ENUM
2450   BFD_RELOC_D30V_9_PCREL_R
2451 ENUMDOC
2452   This is a 6-bit pc-relative reloc with
2453   the right 3 bits assumed to be 0. Same
2454   as the previous reloc but on the right side
2455   of the container.
2456 ENUM
2457   BFD_RELOC_D30V_15
2458 ENUMDOC
2459   This is a 12-bit absolute reloc with the
2460   right 3 bitsassumed to be 0.
2461 ENUM
2462   BFD_RELOC_D30V_15_PCREL
2463 ENUMDOC
2464   This is a 12-bit pc-relative reloc with
2465   the right 3 bits assumed to be 0.
2466 ENUM
2467   BFD_RELOC_D30V_15_PCREL_R
2468 ENUMDOC
2469   This is a 12-bit pc-relative reloc with
2470   the right 3 bits assumed to be 0. Same
2471   as the previous reloc but on the right side
2472   of the container.
2473 ENUM
2474   BFD_RELOC_D30V_21
2475 ENUMDOC
2476   This is an 18-bit absolute reloc with
2477   the right 3 bits assumed to be 0.
2478 ENUM
2479   BFD_RELOC_D30V_21_PCREL
2480 ENUMDOC
2481   This is an 18-bit pc-relative reloc with
2482   the right 3 bits assumed to be 0.
2483 ENUM
2484   BFD_RELOC_D30V_21_PCREL_R
2485 ENUMDOC
2486   This is an 18-bit pc-relative reloc with
2487   the right 3 bits assumed to be 0. Same
2488   as the previous reloc but on the right side
2489   of the container.
2490 ENUM
2491   BFD_RELOC_D30V_32
2492 ENUMDOC
2493   This is a 32-bit absolute reloc.
2494 ENUM
2495   BFD_RELOC_D30V_32_PCREL
2496 ENUMDOC
2497   This is a 32-bit pc-relative reloc.
2498
2499 ENUM
2500   BFD_RELOC_M32R_24
2501 ENUMDOC
2502   Mitsubishi M32R relocs.
2503   This is a 24 bit absolute address.
2504 ENUM
2505   BFD_RELOC_M32R_10_PCREL
2506 ENUMDOC
2507   This is a 10-bit pc-relative reloc with the right 2 bits assumed to be 0.
2508 ENUM
2509   BFD_RELOC_M32R_18_PCREL
2510 ENUMDOC
2511   This is an 18-bit reloc with the right 2 bits assumed to be 0.
2512 ENUM
2513   BFD_RELOC_M32R_26_PCREL
2514 ENUMDOC
2515   This is a 26-bit reloc with the right 2 bits assumed to be 0.
2516 ENUM
2517   BFD_RELOC_M32R_HI16_ULO
2518 ENUMDOC
2519   This is a 16-bit reloc containing the high 16 bits of an address
2520   used when the lower 16 bits are treated as unsigned.
2521 ENUM
2522   BFD_RELOC_M32R_HI16_SLO
2523 ENUMDOC
2524   This is a 16-bit reloc containing the high 16 bits of an address
2525   used when the lower 16 bits are treated as signed.
2526 ENUM
2527   BFD_RELOC_M32R_LO16
2528 ENUMDOC
2529   This is a 16-bit reloc containing the lower 16 bits of an address.
2530 ENUM
2531   BFD_RELOC_M32R_SDA16
2532 ENUMDOC
2533   This is a 16-bit reloc containing the small data area offset for use in
2534   add3, load, and store instructions.
2535
2536 ENUM
2537   BFD_RELOC_V850_9_PCREL
2538 ENUMDOC
2539   This is a 9-bit reloc
2540 ENUM
2541   BFD_RELOC_V850_22_PCREL
2542 ENUMDOC
2543   This is a 22-bit reloc
2544
2545 ENUM
2546   BFD_RELOC_V850_SDA_16_16_OFFSET
2547 ENUMDOC
2548   This is a 16 bit offset from the short data area pointer.
2549 ENUM
2550   BFD_RELOC_V850_SDA_15_16_OFFSET
2551 ENUMDOC
2552   This is a 16 bit offset (of which only 15 bits are used) from the
2553   short data area pointer.
2554 ENUM
2555   BFD_RELOC_V850_ZDA_16_16_OFFSET
2556 ENUMDOC
2557   This is a 16 bit offset from the zero data area pointer.
2558 ENUM
2559   BFD_RELOC_V850_ZDA_15_16_OFFSET
2560 ENUMDOC
2561   This is a 16 bit offset (of which only 15 bits are used) from the
2562   zero data area pointer.
2563 ENUM
2564   BFD_RELOC_V850_TDA_6_8_OFFSET
2565 ENUMDOC
2566   This is an 8 bit offset (of which only 6 bits are used) from the
2567   tiny data area pointer.
2568 ENUM
2569   BFD_RELOC_V850_TDA_7_8_OFFSET
2570 ENUMDOC
2571   This is an 8bit offset (of which only 7 bits are used) from the tiny
2572   data area pointer.
2573 ENUM
2574   BFD_RELOC_V850_TDA_7_7_OFFSET
2575 ENUMDOC
2576   This is a 7 bit offset from the tiny data area pointer.
2577 ENUM
2578   BFD_RELOC_V850_TDA_16_16_OFFSET
2579 ENUMDOC
2580   This is a 16 bit offset from the tiny data area pointer.
2581 COMMENT
2582 ENUM
2583   BFD_RELOC_V850_TDA_4_5_OFFSET
2584 ENUMDOC
2585   This is a 5 bit offset (of which only 4 bits are used) from the tiny
2586   data area pointer.
2587 ENUM
2588   BFD_RELOC_V850_TDA_4_4_OFFSET
2589 ENUMDOC
2590   This is a 4 bit offset from the tiny data area pointer.
2591 ENUM
2592   BFD_RELOC_V850_SDA_16_16_SPLIT_OFFSET
2593 ENUMDOC
2594   This is a 16 bit offset from the short data area pointer, with the
2595   bits placed non-contigously in the instruction.
2596 ENUM
2597   BFD_RELOC_V850_ZDA_16_16_SPLIT_OFFSET
2598 ENUMDOC
2599   This is a 16 bit offset from the zero data area pointer, with the
2600   bits placed non-contigously in the instruction.
2601 ENUM
2602   BFD_RELOC_V850_CALLT_6_7_OFFSET
2603 ENUMDOC
2604   This is a 6 bit offset from the call table base pointer.
2605 ENUM
2606   BFD_RELOC_V850_CALLT_16_16_OFFSET
2607 ENUMDOC
2608   This is a 16 bit offset from the call table base pointer.
2609 COMMENT
2610
2611 ENUM
2612   BFD_RELOC_MN10300_32_PCREL
2613 ENUMDOC
2614   This is a 32bit pcrel reloc for the mn10300, offset by two bytes in the
2615   instruction.
2616 ENUM
2617   BFD_RELOC_MN10300_16_PCREL
2618 ENUMDOC
2619   This is a 16bit pcrel reloc for the mn10300, offset by two bytes in the
2620   instruction.
2621
2622 ENUM
2623   BFD_RELOC_TIC30_LDP
2624 ENUMDOC
2625   This is a 8bit DP reloc for the tms320c30, where the most
2626   significant 8 bits of a 24 bit word are placed into the least
2627   significant 8 bits of the opcode.
2628
2629 ENUM
2630   BFD_RELOC_TIC54X_PARTLS7
2631 ENUMDOC
2632   This is a 7bit reloc for the tms320c54x, where the least
2633   significant 7 bits of a 16 bit word are placed into the least
2634   significant 7 bits of the opcode.
2635
2636 ENUM
2637   BFD_RELOC_TIC54X_PARTMS9
2638 ENUMDOC
2639   This is a 9bit DP reloc for the tms320c54x, where the most
2640   significant 9 bits of a 16 bit word are placed into the least
2641   significant 9 bits of the opcode.
2642
2643 ENUM
2644   BFD_RELOC_TIC54X_23
2645 ENUMDOC
2646   This is an extended address 23-bit reloc for the tms320c54x.
2647
2648 ENUM
2649   BFD_RELOC_TIC54X_16_OF_23
2650 ENUMDOC
2651   This is a 16-bit reloc for the tms320c54x, where the least
2652   significant 16 bits of a 23-bit extended address are placed into
2653   the opcode.
2654
2655 ENUM
2656   BFD_RELOC_TIC54X_MS7_OF_23
2657 ENUMDOC
2658   This is a reloc for the tms320c54x, where the most
2659   significant 7 bits of a 23-bit extended address are placed into
2660   the opcode.
2661
2662 ENUM
2663   BFD_RELOC_FR30_48
2664 ENUMDOC
2665   This is a 48 bit reloc for the FR30 that stores 32 bits.
2666 ENUM
2667   BFD_RELOC_FR30_20
2668 ENUMDOC
2669   This is a 32 bit reloc for the FR30 that stores 20 bits split up into
2670   two sections.
2671 ENUM
2672   BFD_RELOC_FR30_6_IN_4
2673 ENUMDOC
2674   This is a 16 bit reloc for the FR30 that stores a 6 bit word offset in
2675   4 bits.
2676 ENUM
2677   BFD_RELOC_FR30_8_IN_8
2678 ENUMDOC
2679   This is a 16 bit reloc for the FR30 that stores an 8 bit byte offset
2680   into 8 bits.
2681 ENUM
2682   BFD_RELOC_FR30_9_IN_8
2683 ENUMDOC
2684   This is a 16 bit reloc for the FR30 that stores a 9 bit short offset
2685   into 8 bits.
2686 ENUM
2687   BFD_RELOC_FR30_10_IN_8
2688 ENUMDOC
2689   This is a 16 bit reloc for the FR30 that stores a 10 bit word offset
2690   into 8 bits.
2691 ENUM
2692   BFD_RELOC_FR30_9_PCREL
2693 ENUMDOC
2694   This is a 16 bit reloc for the FR30 that stores a 9 bit pc relative
2695   short offset into 8 bits.
2696 ENUM
2697   BFD_RELOC_FR30_12_PCREL
2698 ENUMDOC
2699   This is a 16 bit reloc for the FR30 that stores a 12 bit pc relative
2700   short offset into 11 bits.
2701
2702 ENUM
2703   BFD_RELOC_MCORE_PCREL_IMM8BY4
2704 ENUMX
2705   BFD_RELOC_MCORE_PCREL_IMM11BY2
2706 ENUMX
2707   BFD_RELOC_MCORE_PCREL_IMM4BY2
2708 ENUMX
2709   BFD_RELOC_MCORE_PCREL_32
2710 ENUMX
2711   BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2
2712 ENUMX
2713   BFD_RELOC_MCORE_RVA
2714 ENUMDOC
2715   Motorola Mcore relocations.
2716
2717 ENUM
2718   BFD_RELOC_MMIX_GETA
2719 ENUMX
2720   BFD_RELOC_MMIX_GETA_1
2721 ENUMX
2722   BFD_RELOC_MMIX_GETA_2
2723 ENUMX
2724   BFD_RELOC_MMIX_GETA_3
2725 ENUMDOC
2726   These are relocations for the GETA instruction.
2727 ENUM
2728   BFD_RELOC_MMIX_CBRANCH
2729 ENUMX
2730   BFD_RELOC_MMIX_CBRANCH_J
2731 ENUMX
2732   BFD_RELOC_MMIX_CBRANCH_1
2733 ENUMX
2734   BFD_RELOC_MMIX_CBRANCH_2
2735 ENUMX
2736   BFD_RELOC_MMIX_CBRANCH_3
2737 ENUMDOC
2738   These are relocations for a conditional branch instruction.
2739 ENUM
2740   BFD_RELOC_MMIX_PUSHJ
2741 ENUMX
2742   BFD_RELOC_MMIX_PUSHJ_1
2743 ENUMX
2744   BFD_RELOC_MMIX_PUSHJ_2
2745 ENUMX
2746   BFD_RELOC_MMIX_PUSHJ_3
2747 ENUMDOC
2748   These are relocations for the PUSHJ instruction.
2749 ENUM
2750   BFD_RELOC_MMIX_JMP
2751 ENUMX
2752   BFD_RELOC_MMIX_JMP_1
2753 ENUMX
2754   BFD_RELOC_MMIX_JMP_2
2755 ENUMX
2756   BFD_RELOC_MMIX_JMP_3
2757 ENUMDOC
2758   These are relocations for the JMP instruction.
2759 ENUM
2760   BFD_RELOC_MMIX_ADDR19
2761 ENUMDOC
2762   This is a relocation for a relative address as in a GETA instruction or
2763   a branch.
2764 ENUM
2765   BFD_RELOC_MMIX_ADDR27
2766 ENUMDOC
2767   This is a relocation for a relative address as in a JMP instruction.
2768 ENUM
2769   BFD_RELOC_MMIX_REG_OR_BYTE
2770 ENUMDOC
2771   This is a relocation for an instruction field that may be a general
2772   register or a value 0..255.
2773 ENUM
2774   BFD_RELOC_MMIX_REG
2775 ENUMDOC
2776   This is a relocation for an instruction field that may be a general
2777   register.
2778 ENUM
2779   BFD_RELOC_MMIX_BASE_PLUS_OFFSET
2780 ENUMDOC
2781   This is a relocation for two instruction fields holding a register and
2782   an offset, the equivalent of the relocation.
2783 ENUM
2784   BFD_RELOC_MMIX_LOCAL
2785 ENUMDOC
2786   This relocation is an assertion that the expression is not allocated as
2787   a global register.  It does not modify contents.
2788
2789 ENUM
2790   BFD_RELOC_AVR_7_PCREL
2791 ENUMDOC
2792   This is a 16 bit reloc for the AVR that stores 8 bit pc relative
2793   short offset into 7 bits.
2794 ENUM
2795   BFD_RELOC_AVR_13_PCREL
2796 ENUMDOC
2797   This is a 16 bit reloc for the AVR that stores 13 bit pc relative
2798   short offset into 12 bits.
2799 ENUM
2800   BFD_RELOC_AVR_16_PM
2801 ENUMDOC
2802   This is a 16 bit reloc for the AVR that stores 17 bit value (usually
2803   program memory address) into 16 bits.
2804 ENUM
2805   BFD_RELOC_AVR_LO8_LDI
2806 ENUMDOC
2807   This is a 16 bit reloc for the AVR that stores 8 bit value (usually
2808   data memory address) into 8 bit immediate value of LDI insn.
2809 ENUM
2810   BFD_RELOC_AVR_HI8_LDI
2811 ENUMDOC
2812   This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit
2813   of data memory address) into 8 bit immediate value of LDI insn.
2814 ENUM
2815   BFD_RELOC_AVR_HH8_LDI
2816 ENUMDOC
2817   This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit
2818   of program memory address) into 8 bit immediate value of LDI insn.
2819 ENUM
2820   BFD_RELOC_AVR_LO8_LDI_NEG
2821 ENUMDOC
2822   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2823   (usually data memory address) into 8 bit immediate value of SUBI insn.
2824 ENUM
2825   BFD_RELOC_AVR_HI8_LDI_NEG
2826 ENUMDOC
2827   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2828   (high 8 bit of data memory address) into 8 bit immediate value of
2829   SUBI insn.
2830 ENUM
2831   BFD_RELOC_AVR_HH8_LDI_NEG
2832 ENUMDOC
2833   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2834   (most high 8 bit of program memory address) into 8 bit immediate value
2835   of LDI or SUBI insn.
2836 ENUM
2837   BFD_RELOC_AVR_LO8_LDI_PM
2838 ENUMDOC
2839   This is a 16 bit reloc for the AVR that stores 8 bit value (usually
2840   command address) into 8 bit immediate value of LDI insn.
2841 ENUM
2842   BFD_RELOC_AVR_HI8_LDI_PM
2843 ENUMDOC
2844   This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit
2845   of command address) into 8 bit immediate value of LDI insn.
2846 ENUM
2847   BFD_RELOC_AVR_HH8_LDI_PM
2848 ENUMDOC
2849   This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit
2850   of command address) into 8 bit immediate value of LDI insn.
2851 ENUM
2852   BFD_RELOC_AVR_LO8_LDI_PM_NEG
2853 ENUMDOC
2854   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2855   (usually command address) into 8 bit immediate value of SUBI insn.
2856 ENUM
2857   BFD_RELOC_AVR_HI8_LDI_PM_NEG
2858 ENUMDOC
2859   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2860   (high 8 bit of 16 bit command address) into 8 bit immediate value
2861   of SUBI insn.
2862 ENUM
2863   BFD_RELOC_AVR_HH8_LDI_PM_NEG
2864 ENUMDOC
2865   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2866   (high 6 bit of 22 bit command address) into 8 bit immediate
2867   value of SUBI insn.
2868 ENUM
2869   BFD_RELOC_AVR_CALL
2870 ENUMDOC
2871   This is a 32 bit reloc for the AVR that stores 23 bit value
2872   into 22 bits.
2873
2874 ENUM
2875   BFD_RELOC_390_12
2876 ENUMDOC
2877    Direct 12 bit.
2878 ENUM
2879   BFD_RELOC_390_GOT12
2880 ENUMDOC
2881   12 bit GOT offset.
2882 ENUM
2883   BFD_RELOC_390_PLT32
2884 ENUMDOC
2885   32 bit PC relative PLT address.
2886 ENUM
2887   BFD_RELOC_390_COPY
2888 ENUMDOC
2889   Copy symbol at runtime.
2890 ENUM
2891   BFD_RELOC_390_GLOB_DAT
2892 ENUMDOC
2893   Create GOT entry.
2894 ENUM
2895   BFD_RELOC_390_JMP_SLOT
2896 ENUMDOC
2897   Create PLT entry.
2898 ENUM
2899   BFD_RELOC_390_RELATIVE
2900 ENUMDOC
2901   Adjust by program base.
2902 ENUM
2903   BFD_RELOC_390_GOTPC
2904 ENUMDOC
2905   32 bit PC relative offset to GOT.
2906 ENUM
2907   BFD_RELOC_390_GOT16
2908 ENUMDOC
2909   16 bit GOT offset.
2910 ENUM
2911   BFD_RELOC_390_PC16DBL
2912 ENUMDOC
2913   PC relative 16 bit shifted by 1.
2914 ENUM
2915   BFD_RELOC_390_PLT16DBL
2916 ENUMDOC
2917   16 bit PC rel. PLT shifted by 1.
2918 ENUM
2919   BFD_RELOC_390_PC32DBL
2920 ENUMDOC
2921   PC relative 32 bit shifted by 1.
2922 ENUM
2923   BFD_RELOC_390_PLT32DBL
2924 ENUMDOC
2925   32 bit PC rel. PLT shifted by 1.
2926 ENUM
2927   BFD_RELOC_390_GOTPCDBL
2928 ENUMDOC
2929   32 bit PC rel. GOT shifted by 1.
2930 ENUM
2931   BFD_RELOC_390_GOT64
2932 ENUMDOC
2933   64 bit GOT offset.
2934 ENUM
2935   BFD_RELOC_390_PLT64
2936 ENUMDOC
2937   64 bit PC relative PLT address.
2938 ENUM
2939   BFD_RELOC_390_GOTENT
2940 ENUMDOC
2941   32 bit rel. offset to GOT entry.
2942
2943 ENUM
2944   BFD_RELOC_VTABLE_INHERIT
2945 ENUMX
2946   BFD_RELOC_VTABLE_ENTRY
2947 ENUMDOC
2948   These two relocations are used by the linker to determine which of
2949   the entries in a C++ virtual function table are actually used.  When
2950   the --gc-sections option is given, the linker will zero out the entries
2951   that are not used, so that the code for those functions need not be
2952   included in the output.
2953
2954   VTABLE_INHERIT is a zero-space relocation used to describe to the
2955   linker the inheritence tree of a C++ virtual function table.  The
2956   relocation's symbol should be the parent class' vtable, and the
2957   relocation should be located at the child vtable.
2958
2959   VTABLE_ENTRY is a zero-space relocation that describes the use of a
2960   virtual function table entry.  The reloc's symbol should refer to the
2961   table of the class mentioned in the code.  Off of that base, an offset
2962   describes the entry that is being used.  For Rela hosts, this offset
2963   is stored in the reloc's addend.  For Rel hosts, we are forced to put
2964   this offset in the reloc's section offset.
2965
2966 ENUM
2967   BFD_RELOC_IA64_IMM14
2968 ENUMX
2969   BFD_RELOC_IA64_IMM22
2970 ENUMX
2971   BFD_RELOC_IA64_IMM64
2972 ENUMX
2973   BFD_RELOC_IA64_DIR32MSB
2974 ENUMX
2975   BFD_RELOC_IA64_DIR32LSB
2976 ENUMX
2977   BFD_RELOC_IA64_DIR64MSB
2978 ENUMX
2979   BFD_RELOC_IA64_DIR64LSB
2980 ENUMX
2981   BFD_RELOC_IA64_GPREL22
2982 ENUMX
2983   BFD_RELOC_IA64_GPREL64I
2984 ENUMX
2985   BFD_RELOC_IA64_GPREL32MSB
2986 ENUMX
2987   BFD_RELOC_IA64_GPREL32LSB
2988 ENUMX
2989   BFD_RELOC_IA64_GPREL64MSB
2990 ENUMX
2991   BFD_RELOC_IA64_GPREL64LSB
2992 ENUMX
2993   BFD_RELOC_IA64_LTOFF22
2994 ENUMX
2995   BFD_RELOC_IA64_LTOFF64I
2996 ENUMX
2997   BFD_RELOC_IA64_PLTOFF22
2998 ENUMX
2999   BFD_RELOC_IA64_PLTOFF64I
3000 ENUMX
3001   BFD_RELOC_IA64_PLTOFF64MSB
3002 ENUMX
3003   BFD_RELOC_IA64_PLTOFF64LSB
3004 ENUMX
3005   BFD_RELOC_IA64_FPTR64I
3006 ENUMX
3007   BFD_RELOC_IA64_FPTR32MSB
3008 ENUMX
3009   BFD_RELOC_IA64_FPTR32LSB
3010 ENUMX
3011   BFD_RELOC_IA64_FPTR64MSB
3012 ENUMX
3013   BFD_RELOC_IA64_FPTR64LSB
3014 ENUMX
3015   BFD_RELOC_IA64_PCREL21B
3016 ENUMX
3017   BFD_RELOC_IA64_PCREL21BI
3018 ENUMX
3019   BFD_RELOC_IA64_PCREL21M
3020 ENUMX
3021   BFD_RELOC_IA64_PCREL21F
3022 ENUMX
3023   BFD_RELOC_IA64_PCREL22
3024 ENUMX
3025   BFD_RELOC_IA64_PCREL60B
3026 ENUMX
3027   BFD_RELOC_IA64_PCREL64I
3028 ENUMX
3029   BFD_RELOC_IA64_PCREL32MSB
3030 ENUMX
3031   BFD_RELOC_IA64_PCREL32LSB
3032 ENUMX
3033   BFD_RELOC_IA64_PCREL64MSB
3034 ENUMX
3035   BFD_RELOC_IA64_PCREL64LSB
3036 ENUMX
3037   BFD_RELOC_IA64_LTOFF_FPTR22
3038 ENUMX
3039   BFD_RELOC_IA64_LTOFF_FPTR64I
3040 ENUMX
3041   BFD_RELOC_IA64_LTOFF_FPTR32MSB
3042 ENUMX
3043   BFD_RELOC_IA64_LTOFF_FPTR32LSB
3044 ENUMX
3045   BFD_RELOC_IA64_LTOFF_FPTR64MSB
3046 ENUMX
3047   BFD_RELOC_IA64_LTOFF_FPTR64LSB
3048 ENUMX
3049   BFD_RELOC_IA64_SEGREL32MSB
3050 ENUMX
3051   BFD_RELOC_IA64_SEGREL32LSB
3052 ENUMX
3053   BFD_RELOC_IA64_SEGREL64MSB
3054 ENUMX
3055   BFD_RELOC_IA64_SEGREL64LSB
3056 ENUMX
3057   BFD_RELOC_IA64_SECREL32MSB
3058 ENUMX
3059   BFD_RELOC_IA64_SECREL32LSB
3060 ENUMX
3061   BFD_RELOC_IA64_SECREL64MSB
3062 ENUMX
3063   BFD_RELOC_IA64_SECREL64LSB
3064 ENUMX
3065   BFD_RELOC_IA64_REL32MSB
3066 ENUMX
3067   BFD_RELOC_IA64_REL32LSB
3068 ENUMX
3069   BFD_RELOC_IA64_REL64MSB
3070 ENUMX
3071   BFD_RELOC_IA64_REL64LSB
3072 ENUMX
3073   BFD_RELOC_IA64_LTV32MSB
3074 ENUMX
3075   BFD_RELOC_IA64_LTV32LSB
3076 ENUMX
3077   BFD_RELOC_IA64_LTV64MSB
3078 ENUMX
3079   BFD_RELOC_IA64_LTV64LSB
3080 ENUMX
3081   BFD_RELOC_IA64_IPLTMSB
3082 ENUMX
3083   BFD_RELOC_IA64_IPLTLSB
3084 ENUMX
3085   BFD_RELOC_IA64_COPY
3086 ENUMX
3087   BFD_RELOC_IA64_TPREL22
3088 ENUMX
3089   BFD_RELOC_IA64_TPREL64MSB
3090 ENUMX
3091   BFD_RELOC_IA64_TPREL64LSB
3092 ENUMX
3093   BFD_RELOC_IA64_LTOFF_TP22
3094 ENUMX
3095   BFD_RELOC_IA64_LTOFF22X
3096 ENUMX
3097   BFD_RELOC_IA64_LDXMOV
3098 ENUMDOC
3099   Intel IA64 Relocations.
3100
3101 ENUM
3102   BFD_RELOC_M68HC11_HI8
3103 ENUMDOC
3104   Motorola 68HC11 reloc.
3105   This is the 8 bits high part of an absolute address.
3106 ENUM
3107   BFD_RELOC_M68HC11_LO8
3108 ENUMDOC
3109   Motorola 68HC11 reloc.
3110   This is the 8 bits low part of an absolute address.
3111 ENUM
3112   BFD_RELOC_M68HC11_3B
3113 ENUMDOC
3114   Motorola 68HC11 reloc.
3115   This is the 3 bits of a value.
3116
3117 ENUM
3118   BFD_RELOC_CRIS_BDISP8
3119 ENUMX
3120   BFD_RELOC_CRIS_UNSIGNED_5
3121 ENUMX
3122   BFD_RELOC_CRIS_SIGNED_6
3123 ENUMX
3124   BFD_RELOC_CRIS_UNSIGNED_6
3125 ENUMX
3126   BFD_RELOC_CRIS_UNSIGNED_4
3127 ENUMDOC
3128   These relocs are only used within the CRIS assembler.  They are not
3129   (at present) written to any object files.
3130 ENUM
3131   BFD_RELOC_CRIS_COPY
3132 ENUMX
3133   BFD_RELOC_CRIS_GLOB_DAT
3134 ENUMX
3135   BFD_RELOC_CRIS_JUMP_SLOT
3136 ENUMX
3137   BFD_RELOC_CRIS_RELATIVE
3138 ENUMDOC
3139   Relocs used in ELF shared libraries for CRIS.
3140 ENUM
3141   BFD_RELOC_CRIS_32_GOT
3142 ENUMDOC
3143   32-bit offset to symbol-entry within GOT.
3144 ENUM
3145   BFD_RELOC_CRIS_16_GOT
3146 ENUMDOC
3147   16-bit offset to symbol-entry within GOT.
3148 ENUM
3149   BFD_RELOC_CRIS_32_GOTPLT
3150 ENUMDOC
3151   32-bit offset to symbol-entry within GOT, with PLT handling.
3152 ENUM
3153   BFD_RELOC_CRIS_16_GOTPLT
3154 ENUMDOC
3155   16-bit offset to symbol-entry within GOT, with PLT handling.
3156 ENUM
3157   BFD_RELOC_CRIS_32_GOTREL
3158 ENUMDOC
3159   32-bit offset to symbol, relative to GOT.
3160 ENUM
3161   BFD_RELOC_CRIS_32_PLT_GOTREL
3162 ENUMDOC
3163   32-bit offset to symbol with PLT entry, relative to GOT.
3164 ENUM
3165   BFD_RELOC_CRIS_32_PLT_PCREL
3166 ENUMDOC
3167   32-bit offset to symbol with PLT entry, relative to this relocation.
3168
3169 ENUM
3170   BFD_RELOC_860_COPY
3171 ENUMX
3172   BFD_RELOC_860_GLOB_DAT
3173 ENUMX
3174   BFD_RELOC_860_JUMP_SLOT
3175 ENUMX
3176   BFD_RELOC_860_RELATIVE
3177 ENUMX
3178   BFD_RELOC_860_PC26
3179 ENUMX
3180   BFD_RELOC_860_PLT26
3181 ENUMX
3182   BFD_RELOC_860_PC16
3183 ENUMX
3184   BFD_RELOC_860_LOW0
3185 ENUMX
3186   BFD_RELOC_860_SPLIT0
3187 ENUMX
3188   BFD_RELOC_860_LOW1
3189 ENUMX
3190   BFD_RELOC_860_SPLIT1
3191 ENUMX
3192   BFD_RELOC_860_LOW2
3193 ENUMX
3194   BFD_RELOC_860_SPLIT2
3195 ENUMX
3196   BFD_RELOC_860_LOW3
3197 ENUMX
3198   BFD_RELOC_860_LOGOT0
3199 ENUMX
3200   BFD_RELOC_860_SPGOT0
3201 ENUMX
3202   BFD_RELOC_860_LOGOT1
3203 ENUMX
3204   BFD_RELOC_860_SPGOT1
3205 ENUMX
3206   BFD_RELOC_860_LOGOTOFF0
3207 ENUMX
3208   BFD_RELOC_860_SPGOTOFF0
3209 ENUMX
3210   BFD_RELOC_860_LOGOTOFF1
3211 ENUMX
3212   BFD_RELOC_860_SPGOTOFF1
3213 ENUMX
3214   BFD_RELOC_860_LOGOTOFF2
3215 ENUMX
3216   BFD_RELOC_860_LOGOTOFF3
3217 ENUMX
3218   BFD_RELOC_860_LOPC
3219 ENUMX
3220   BFD_RELOC_860_HIGHADJ
3221 ENUMX
3222   BFD_RELOC_860_HAGOT
3223 ENUMX
3224   BFD_RELOC_860_HAGOTOFF
3225 ENUMX
3226   BFD_RELOC_860_HAPC
3227 ENUMX
3228   BFD_RELOC_860_HIGH
3229 ENUMX
3230   BFD_RELOC_860_HIGOT
3231 ENUMX
3232   BFD_RELOC_860_HIGOTOFF
3233 ENUMDOC
3234   Intel i860 Relocations.
3235
3236 ENUM
3237   BFD_RELOC_OPENRISC_ABS_26
3238 ENUMX
3239   BFD_RELOC_OPENRISC_REL_26
3240 ENUMDOC
3241   OpenRISC Relocations.
3242
3243 ENUM
3244   BFD_RELOC_H8_DIR16A8
3245 ENUMX
3246   BFD_RELOC_H8_DIR16R8
3247 ENUMX
3248   BFD_RELOC_H8_DIR24A8
3249 ENUMX
3250   BFD_RELOC_H8_DIR24R8
3251 ENUMX
3252   BFD_RELOC_H8_DIR32A16
3253 ENUMDOC
3254   H8 elf Relocations.
3255
3256 ENUM
3257   BFD_RELOC_XSTORMY16_REL_12
3258 ENUMX
3259   BFD_RELOC_XSTORMY16_24
3260 ENUMX
3261   BFD_RELOC_XSTORMY16_FPTR16
3262 ENUMDOC
3263   Sony Xstormy16 Relocations.
3264
3265 ENDSENUM
3266   BFD_RELOC_UNUSED
3267 CODE_FRAGMENT
3268 .
3269 .typedef enum bfd_reloc_code_real bfd_reloc_code_real_type;
3270 */
3271
3272 /*
3273 FUNCTION
3274         bfd_reloc_type_lookup
3275
3276 SYNOPSIS
3277         reloc_howto_type *
3278         bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code);
3279
3280 DESCRIPTION
3281         Return a pointer to a howto structure which, when
3282         invoked, will perform the relocation @var{code} on data from the
3283         architecture noted.
3284
3285 */
3286
3287 reloc_howto_type *
3288 bfd_reloc_type_lookup (abfd, code)
3289      bfd *abfd;
3290      bfd_reloc_code_real_type code;
3291 {
3292   return BFD_SEND (abfd, reloc_type_lookup, (abfd, code));
3293 }
3294
3295 static reloc_howto_type bfd_howto_32 =
3296 HOWTO (0, 00, 2, 32, false, 0, complain_overflow_bitfield, 0, "VRT32", false, 0xffffffff, 0xffffffff, true);
3297
3298 /*
3299 INTERNAL_FUNCTION
3300         bfd_default_reloc_type_lookup
3301
3302 SYNOPSIS
3303         reloc_howto_type *bfd_default_reloc_type_lookup
3304         (bfd *abfd, bfd_reloc_code_real_type  code);
3305
3306 DESCRIPTION
3307         Provides a default relocation lookup routine for any architecture.
3308
3309 */
3310
3311 reloc_howto_type *
3312 bfd_default_reloc_type_lookup (abfd, code)
3313      bfd *abfd;
3314      bfd_reloc_code_real_type code;
3315 {
3316   switch (code)
3317     {
3318     case BFD_RELOC_CTOR:
3319       /* The type of reloc used in a ctor, which will be as wide as the
3320          address - so either a 64, 32, or 16 bitter.  */
3321       switch (bfd_get_arch_info (abfd)->bits_per_address)
3322         {
3323         case 64:
3324           BFD_FAIL ();
3325         case 32:
3326           return &bfd_howto_32;
3327         case 16:
3328           BFD_FAIL ();
3329         default:
3330           BFD_FAIL ();
3331         }
3332     default:
3333       BFD_FAIL ();
3334     }
3335   return (reloc_howto_type *) NULL;
3336 }
3337
3338 /*
3339 FUNCTION
3340         bfd_get_reloc_code_name
3341
3342 SYNOPSIS
3343         const char *bfd_get_reloc_code_name (bfd_reloc_code_real_type code);
3344
3345 DESCRIPTION
3346         Provides a printable name for the supplied relocation code.
3347         Useful mainly for printing error messages.
3348 */
3349
3350 const char *
3351 bfd_get_reloc_code_name (code)
3352      bfd_reloc_code_real_type code;
3353 {
3354   if (code > BFD_RELOC_UNUSED)
3355     return 0;
3356   return bfd_reloc_code_real_names[(int)code];
3357 }
3358
3359 /*
3360 INTERNAL_FUNCTION
3361         bfd_generic_relax_section
3362
3363 SYNOPSIS
3364         boolean bfd_generic_relax_section
3365          (bfd *abfd,
3366           asection *section,
3367           struct bfd_link_info *,
3368           boolean *);
3369
3370 DESCRIPTION
3371         Provides default handling for relaxing for back ends which
3372         don't do relaxing -- i.e., does nothing.
3373 */
3374
3375 /*ARGSUSED*/
3376 boolean
3377 bfd_generic_relax_section (abfd, section, link_info, again)
3378      bfd *abfd ATTRIBUTE_UNUSED;
3379      asection *section ATTRIBUTE_UNUSED;
3380      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3381      boolean *again;
3382 {
3383   *again = false;
3384   return true;
3385 }
3386
3387 /*
3388 INTERNAL_FUNCTION
3389         bfd_generic_gc_sections
3390
3391 SYNOPSIS
3392         boolean bfd_generic_gc_sections
3393          (bfd *, struct bfd_link_info *);
3394
3395 DESCRIPTION
3396         Provides default handling for relaxing for back ends which
3397         don't do section gc -- i.e., does nothing.
3398 */
3399
3400 /*ARGSUSED*/
3401 boolean
3402 bfd_generic_gc_sections (abfd, link_info)
3403      bfd *abfd ATTRIBUTE_UNUSED;
3404      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3405 {
3406   return true;
3407 }
3408
3409 /*
3410 INTERNAL_FUNCTION
3411         bfd_generic_merge_sections
3412
3413 SYNOPSIS
3414         boolean bfd_generic_merge_sections
3415          (bfd *, struct bfd_link_info *);
3416
3417 DESCRIPTION
3418         Provides default handling for SEC_MERGE section merging for back ends
3419         which don't have SEC_MERGE support -- i.e., does nothing.
3420 */
3421
3422 /*ARGSUSED*/
3423 boolean
3424 bfd_generic_merge_sections (abfd, link_info)
3425      bfd *abfd ATTRIBUTE_UNUSED;
3426      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3427 {
3428   return true;
3429 }
3430
3431 /*
3432 INTERNAL_FUNCTION
3433         bfd_generic_get_relocated_section_contents
3434
3435 SYNOPSIS
3436         bfd_byte *
3437            bfd_generic_get_relocated_section_contents (bfd *abfd,
3438              struct bfd_link_info *link_info,
3439              struct bfd_link_order *link_order,
3440              bfd_byte *data,
3441              boolean relocateable,
3442              asymbol **symbols);
3443
3444 DESCRIPTION
3445         Provides default handling of relocation effort for back ends
3446         which can't be bothered to do it efficiently.
3447
3448 */
3449
3450 bfd_byte *
3451 bfd_generic_get_relocated_section_contents (abfd, link_info, link_order, data,
3452                                             relocateable, symbols)
3453      bfd *abfd;
3454      struct bfd_link_info *link_info;
3455      struct bfd_link_order *link_order;
3456      bfd_byte *data;
3457      boolean relocateable;
3458      asymbol **symbols;
3459 {
3460   /* Get enough memory to hold the stuff */
3461   bfd *input_bfd = link_order->u.indirect.section->owner;
3462   asection *input_section = link_order->u.indirect.section;
3463
3464   long reloc_size = bfd_get_reloc_upper_bound (input_bfd, input_section);
3465   arelent **reloc_vector = NULL;
3466   long reloc_count;
3467
3468   if (reloc_size < 0)
3469     goto error_return;
3470
3471   reloc_vector = (arelent **) bfd_malloc ((bfd_size_type) reloc_size);
3472   if (reloc_vector == NULL && reloc_size != 0)
3473     goto error_return;
3474
3475   /* read in the section */
3476   if (!bfd_get_section_contents (input_bfd,
3477                                  input_section,
3478                                  (PTR) data,
3479                                  (bfd_vma) 0,
3480                                  input_section->_raw_size))
3481     goto error_return;
3482
3483   /* We're not relaxing the section, so just copy the size info */
3484   input_section->_cooked_size = input_section->_raw_size;
3485   input_section->reloc_done = true;
3486
3487   reloc_count = bfd_canonicalize_reloc (input_bfd,
3488                                         input_section,
3489                                         reloc_vector,
3490                                         symbols);
3491   if (reloc_count < 0)
3492     goto error_return;
3493
3494   if (reloc_count > 0)
3495     {
3496       arelent **parent;
3497       for (parent = reloc_vector; *parent != (arelent *) NULL;
3498            parent++)
3499         {
3500           char *error_message = (char *) NULL;
3501           bfd_reloc_status_type r =
3502             bfd_perform_relocation (input_bfd,
3503                                     *parent,
3504                                     (PTR) data,
3505                                     input_section,
3506                                     relocateable ? abfd : (bfd *) NULL,
3507                                     &error_message);
3508
3509           if (relocateable)
3510             {
3511               asection *os = input_section->output_section;
3512
3513               /* A partial link, so keep the relocs */
3514               os->orelocation[os->reloc_count] = *parent;
3515               os->reloc_count++;
3516             }
3517
3518           if (r != bfd_reloc_ok)
3519             {
3520               switch (r)
3521                 {
3522                 case bfd_reloc_undefined:
3523                   if (!((*link_info->callbacks->undefined_symbol)
3524                         (link_info, bfd_asymbol_name (*(*parent)->sym_ptr_ptr),
3525                          input_bfd, input_section, (*parent)->address,
3526                          true)))
3527                     goto error_return;
3528                   break;
3529                 case bfd_reloc_dangerous:
3530                   BFD_ASSERT (error_message != (char *) NULL);
3531                   if (!((*link_info->callbacks->reloc_dangerous)
3532                         (link_info, error_message, input_bfd, input_section,
3533                          (*parent)->address)))
3534                     goto error_return;
3535                   break;
3536                 case bfd_reloc_overflow:
3537                   if (!((*link_info->callbacks->reloc_overflow)
3538                         (link_info, bfd_asymbol_name (*(*parent)->sym_ptr_ptr),
3539                          (*parent)->howto->name, (*parent)->addend,
3540                          input_bfd, input_section, (*parent)->address)))
3541                     goto error_return;
3542                   break;
3543                 case bfd_reloc_outofrange:
3544                 default:
3545                   abort ();
3546                   break;
3547                 }
3548
3549             }
3550         }
3551     }
3552   if (reloc_vector != NULL)
3553     free (reloc_vector);
3554   return data;
3555
3556 error_return:
3557   if (reloc_vector != NULL)
3558     free (reloc_vector);
3559   return NULL;
3560 }