bfd/reloc.c

   1 /* BFD support for handling relocation entries.
   2    Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97, 98, 99, 2000
   3    Free Software Foundation, Inc.
   4    Written by Cygnus Support.
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 /*
  23 SECTION
  24         Relocations
  25
  26         BFD maintains relocations in much the same way it maintains
  27         symbols: they are left alone until required, then read in
  28         en-masse and translated into an internal form.  A common
  29         routine <<bfd_perform_relocation>> acts upon the
  30         canonical form to do the fixup.
  31
  32         Relocations are maintained on a per section basis,
  33         while symbols are maintained on a per BFD basis.
  34
  35         All that a back end has to do to fit the BFD interface is to create
  36         a <<struct reloc_cache_entry>> for each relocation
  37         in a particular section, and fill in the right bits of the structures.
  38
  39 @menu
  40 @* typedef arelent::
  41 @* howto manager::
  42 @end menu
  43
  44 */
  45
  46 /* DO compile in the reloc_code name table from libbfd.h.  */
  47 #define _BFD_MAKE_TABLE_bfd_reloc_code_real
  48
  49 #include "bfd.h"
  50 #include "sysdep.h"
  51 #include "bfdlink.h"
  52 #include "libbfd.h"
  53 /*
  54 DOCDD
  55 INODE
  56         typedef arelent, howto manager, Relocations, Relocations
  57
  58 SUBSECTION
  59         typedef arelent
  60
  61         This is the structure of a relocation entry:
  62
  63 CODE_FRAGMENT
  64 .
  65 .typedef enum bfd_reloc_status
  66 .{
  67 .       {* No errors detected *}
  68 .  bfd_reloc_ok,
  69 .
  70 .       {* The relocation was performed, but there was an overflow. *}
  71 .  bfd_reloc_overflow,
  72 .
  73 .       {* The address to relocate was not within the section supplied. *}
  74 .  bfd_reloc_outofrange,
  75 .
  76 .       {* Used by special functions *}
  77 .  bfd_reloc_continue,
  78 .
  79 .       {* Unsupported relocation size requested. *}
  80 .  bfd_reloc_notsupported,
  81 .
  82 .       {* Unused *}
  83 .  bfd_reloc_other,
  84 .
  85 .       {* The symbol to relocate against was undefined. *}
  86 .  bfd_reloc_undefined,
  87 .
  88 .       {* The relocation was performed, but may not be ok - presently
  89 .          generated only when linking i960 coff files with i960 b.out
  90 .          symbols.  If this type is returned, the error_message argument
  91 .          to bfd_perform_relocation will be set.  *}
  92 .  bfd_reloc_dangerous
  93 . }
  94 . bfd_reloc_status_type;
  95 .
  96 .
  97 .typedef struct reloc_cache_entry
  98 .{
  99 .       {* A pointer into the canonical table of pointers  *}
 100 .  struct symbol_cache_entry **sym_ptr_ptr;
 101 .
 102 .       {* offset in section *}
 103 .  bfd_size_type address;
 104 .
 105 .       {* addend for relocation value *}
 106 .  bfd_vma addend;
 107 .
 108 .       {* Pointer to how to perform the required relocation *}
 109 .  reloc_howto_type *howto;
 110 .
 111 .} arelent;
 112
 113 */
 114
 115 /*
 116 DESCRIPTION
 117
 118         Here is a description of each of the fields within an <<arelent>>:
 119
 120         o <<sym_ptr_ptr>>
 121
 122         The symbol table pointer points to a pointer to the symbol
 123         associated with the relocation request.  It is
 124         the pointer into the table returned by the back end's
 125         <<get_symtab>> action. @xref{Symbols}. The symbol is referenced
 126         through a pointer to a pointer so that tools like the linker
 127         can fix up all the symbols of the same name by modifying only
 128         one pointer. The relocation routine looks in the symbol and
 129         uses the base of the section the symbol is attached to and the
 130         value of the symbol as the initial relocation offset. If the
 131         symbol pointer is zero, then the section provided is looked up.
 132
 133         o <<address>>
 134
 135         The <<address>> field gives the offset in bytes from the base of
 136         the section data which owns the relocation record to the first
 137         byte of relocatable information. The actual data relocated
 138         will be relative to this point; for example, a relocation
 139         type which modifies the bottom two bytes of a four byte word
 140         would not touch the first byte pointed to in a big endian
 141         world.
 142
 143         o <<addend>>
 144
 145         The <<addend>> is a value provided by the back end to be added (!)
 146         to the relocation offset. Its interpretation is dependent upon
 147         the howto. For example, on the 68k the code:
 148
 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
 165         This could create a reloc pointing to <<foo>>, but leave the
 166         offset in the data, something like:
 167
 168
 169 |RELOCATION RECORDS FOR [.text]:
 170 |offset   type      value
 171 |00000006 32        _foo
 172 |
 173 |00000000 4e56 fffc          ; linkw fp,#-4
 174 |00000004 1039 1234 5678     ; moveb @@#12345678,d0
 175 |0000000a 49c0               ; extbl d0
 176 |0000000c 4e5e               ; unlk fp
 177 |0000000e 4e75               ; rts
 178
 179
 180         Using coff and an 88k, some instructions don't have enough
 181         space in them to represent the full address range, and
 182         pointers have to be loaded in two parts. So you'd get something like:
 183
 184
 185 |        or.u     r13,r0,hi16(_foo+0x12345678)
 186 |        ld.b     r2,r13,lo16(_foo+0x12345678)
 187 |        jmp      r1
 188
 189
 190         This should create two relocs, both pointing to <<_foo>>, and with
 191         0x12340000 in their addend field. The data would consist of:
 192
 193
 194 |RELOCATION RECORDS FOR [.text]:
 195 |offset   type      value
 196 |00000002 HVRT16    _foo+0x12340000
 197 |00000006 LVRT16    _foo+0x12340000
 198 |
 199 |00000000 5da05678           ; or.u r13,r0,0x5678
 200 |00000004 1c4d5678           ; ld.b r2,r13,0x5678
 201 |00000008 f400c001           ; jmp r1
 202
 203
 204         The relocation routine digs out the value from the data, adds
 205         it to the addend to get the original offset, and then adds the
 206         value of <<_foo>>. Note that all 32 bits have to be kept around
 207         somewhere, to cope with carry from bit 15 to bit 16.
 208
 209         One further example is the sparc and the a.out format. The
 210         sparc has a similar problem to the 88k, in that some
 211         instructions don't have room for an entire offset, but on the
 212         sparc the parts are created in odd sized lumps. The designers of
 213         the a.out format chose to not use the data within the section
 214         for storing part of the offset; all the offset is kept within
 215         the reloc. Anything in the data should be ignored.
 216
 217 |        save %sp,-112,%sp
 218 |        sethi %hi(_foo+0x12345678),%g2
 219 |        ldsb [%g2+%lo(_foo+0x12345678)],%i0
 220 |        ret
 221 |        restore
 222
 223         Both relocs contain a pointer to <<foo>>, and the offsets
 224         contain junk.
 225
 226
 227 |RELOCATION RECORDS FOR [.text]:
 228 |offset   type      value
 229 |00000004 HI22      _foo+0x12345678
 230 |00000008 LO10      _foo+0x12345678
 231 |
 232 |00000000 9de3bf90     ; save %sp,-112,%sp
 233 |00000004 05000000     ; sethi %hi(_foo+0),%g2
 234 |00000008 f048a000     ; ldsb [%g2+%lo(_foo+0)],%i0
 235 |0000000c 81c7e008     ; ret
 236 |00000010 81e80000     ; restore
 237
 238
 239         o <<howto>>
 240
 241         The <<howto>> field can be imagined as a
 242         relocation instruction. It is a pointer to a structure which
 243         contains information on what to do with all of the other
 244         information in the reloc record and data section. A back end
 245         would normally have a relocation instruction set and turn
 246         relocations into pointers to the correct structure on input -
 247         but it would be possible to create each howto field on demand.
 248
 249 */
 250
 251 /*
 252 SUBSUBSECTION
 253         <<enum complain_overflow>>
 254
 255         Indicates what sort of overflow checking should be done when
 256         performing a relocation.
 257
 258 CODE_FRAGMENT
 259 .
 260 .enum complain_overflow
 261 .{
 262 .       {* Do not complain on overflow. *}
 263 .  complain_overflow_dont,
 264 .
 265 .       {* Complain if the bitfield overflows, whether it is considered
 266 .          as signed or unsigned. *}
 267 .  complain_overflow_bitfield,
 268 .
 269 .       {* Complain if the value overflows when considered as signed
 270 .          number. *}
 271 .  complain_overflow_signed,
 272 .
 273 .       {* Complain if the value overflows when considered as an
 274 .          unsigned number. *}
 275 .  complain_overflow_unsigned
 276 .};
 277
 278 */
 279
 280 /*
 281 SUBSUBSECTION
 282         <<reloc_howto_type>>
 283
 284         The <<reloc_howto_type>> is a structure which contains all the
 285         information that libbfd needs to know to tie up a back end's data.
 286
 287 CODE_FRAGMENT
 288 .struct symbol_cache_entry;             {* Forward declaration *}
 289 .
 290 .struct reloc_howto_struct
 291 .{
 292 .       {*  The type field has mainly a documentary use - the back end can
 293 .           do what it wants with it, though normally the back end's
 294 .           external idea of what a reloc number is stored
 295 .           in this field. For example, a PC relative word relocation
 296 .           in a coff environment has the type 023 - because that's
 297 .           what the outside world calls a R_PCRWORD reloc. *}
 298 .  unsigned int type;
 299 .
 300 .       {*  The value the final relocation is shifted right by. This drops
 301 .           unwanted data from the relocation.  *}
 302 .  unsigned int rightshift;
 303 .
 304 .       {*  The size of the item to be relocated.  This is *not* a
 305 .           power-of-two measure.  To get the number of bytes operated
 306 .           on by a type of relocation, use bfd_get_reloc_size.  *}
 307 .  int size;
 308 .
 309 .       {*  The number of bits in the item to be relocated.  This is used
 310 .           when doing overflow checking.  *}
 311 .  unsigned int bitsize;
 312 .
 313 .       {*  Notes that the relocation is relative to the location in the
 314 .           data section of the addend. The relocation function will
 315 .           subtract from the relocation value the address of the location
 316 .           being relocated. *}
 317 .  boolean pc_relative;
 318 .
 319 .       {*  The bit position of the reloc value in the destination.
 320 .           The relocated value is left shifted by this amount. *}
 321 .  unsigned int bitpos;
 322 .
 323 .       {* What type of overflow error should be checked for when
 324 .          relocating. *}
 325 .  enum complain_overflow complain_on_overflow;
 326 .
 327 .       {* If this field is non null, then the supplied function is
 328 .          called rather than the normal function. This allows really
 329 .          strange relocation methods to be accomodated (e.g., i960 callj
 330 .          instructions). *}
 331 .  bfd_reloc_status_type (*special_function)
 332 .                                   PARAMS ((bfd *abfd,
 333 .                                            arelent *reloc_entry,
 334 .                                            struct symbol_cache_entry *symbol,
 335 .                                            PTR data,
 336 .                                            asection *input_section,
 337 .                                            bfd *output_bfd,
 338 .                                            char **error_message));
 339 .
 340 .       {* The textual name of the relocation type. *}
 341 .  char *name;
 342 .
 343 .       {* Some formats record a relocation addend in the section contents
 344 .          rather than with the relocation.  For ELF formats this is the
 345 .          distinction between USE_REL and USE_RELA (though the code checks
 346 .          for USE_REL == 1/0).  The value of this field is TRUE if the
 347 .          addend is recorded with the section contents; when performing a
 348 .          partial link (ld -r) the section contents (the data) will be
 349 .          modified.  The value of this field is FALSE if addends are
 350 .          recorded with the relocation (in arelent.addend); when performing
 351 .          a partial link the relocation will be modified.
 352 .          All relocations for all ELF USE_RELA targets should set this field
 353 .          to FALSE (values of TRUE should be looked on with suspicion).
 354 .          However, the converse is not true: not all relocations of all ELF
 355 .          USE_REL targets set this field to TRUE.  Why this is so is peculiar
 356 .          to each particular target.  For relocs that aren't used in partial
 357 .          links (e.g. GOT stuff) it doesn't matter what this is set to.  *}
 358 .  boolean partial_inplace;
 359 .
 360 .       {* The src_mask selects which parts of the read in data
 361 .          are to be used in the relocation sum.  E.g., if this was an 8 bit
 362 .          byte of data which we read and relocated, this would be
 363 .          0x000000ff. When we have relocs which have an addend, such as
 364 .          sun4 extended relocs, the value in the offset part of a
 365 .          relocating field is garbage so we never use it. In this case
 366 .          the mask would be 0x00000000. *}
 367 .  bfd_vma src_mask;
 368 .
 369 .       {* The dst_mask selects which parts of the instruction are replaced
 370 .          into the instruction. In most cases src_mask == dst_mask,
 371 .          except in the above special case, where dst_mask would be
 372 .          0x000000ff, and src_mask would be 0x00000000.   *}
 373 .  bfd_vma dst_mask;
 374 .
 375 .       {* When some formats create PC relative instructions, they leave
 376 .          the value of the pc of the place being relocated in the offset
 377 .          slot of the instruction, so that a PC relative relocation can
 378 .          be made just by adding in an ordinary offset (e.g., sun3 a.out).
 379 .          Some formats leave the displacement part of an instruction
 380 .          empty (e.g., m88k bcs); this flag signals the fact.*}
 381 .  boolean pcrel_offset;
 382 .
 383 .};
 384
 385 */
 386
 387 /*
 388 FUNCTION
 389         The HOWTO Macro
 390
 391 DESCRIPTION
 392         The HOWTO define is horrible and will go away.
 393
 394
 395 .#define HOWTO(C, R,S,B, P, BI, O, SF, NAME, INPLACE, MASKSRC, MASKDST, PC) \
 396 .  {(unsigned)C,R,S,B, P, BI, O,SF,NAME,INPLACE,MASKSRC,MASKDST,PC}
 397
 398 DESCRIPTION
 399         And will be replaced with the totally magic way. But for the
 400         moment, we are compatible, so do it this way.
 401
 402
 403 .#define NEWHOWTO( FUNCTION, NAME,SIZE,REL,IN) HOWTO(0,0,SIZE,0,REL,0,complain_overflow_dont,FUNCTION, NAME,false,0,0,IN)
 404 .
 405
 406 DESCRIPTION
 407         This is used to fill in an empty howto entry in an array.
 408
 409 .#define EMPTY_HOWTO(C) \
 410 .  HOWTO((C),0,0,0,false,0,complain_overflow_dont,NULL,NULL,false,0,0,false)
 411 .
 412
 413 DESCRIPTION
 414         Helper routine to turn a symbol into a relocation value.
 415
 416 .#define HOWTO_PREPARE(relocation, symbol)      \
 417 .  {                                            \
 418 .  if (symbol != (asymbol *)NULL) {             \
 419 .    if (bfd_is_com_section (symbol->section)) { \
 420 .      relocation = 0;                          \
 421 .    }                                          \
 422 .    else {                                     \
 423 .      relocation = symbol->value;              \
 424 .    }                                          \
 425 .  }                                            \
 426 .}
 427
 428 */
 429
 430 /*
 431 FUNCTION
 432         bfd_get_reloc_size
 433
 434 SYNOPSIS
 435         unsigned int bfd_get_reloc_size (reloc_howto_type *);
 436
 437 DESCRIPTION
 438         For a reloc_howto_type that operates on a fixed number of bytes,
 439         this returns the number of bytes operated on.
 440  */
 441
 442 unsigned int
 443 bfd_get_reloc_size (howto)
 444      reloc_howto_type *howto;
 445 {
 446   switch (howto->size)
 447     {
 448     case 0: return 1;
 449     case 1: return 2;
 450     case 2: return 4;
 451     case 3: return 0;
 452     case 4: return 8;
 453     case 8: return 16;
 454     case -2: return 4;
 455     default: abort ();
 456     }
 457 }
 458
 459 /*
 460 TYPEDEF
 461         arelent_chain
 462
 463 DESCRIPTION
 464
 465         How relocs are tied together in an <<asection>>:
 466
 467 .typedef struct relent_chain {
 468 .  arelent relent;
 469 .  struct   relent_chain *next;
 470 .} arelent_chain;
 471
 472 */
 473
 474 /* N_ONES produces N one bits, without overflowing machine arithmetic.  */
 475 #define N_ONES(n) (((((bfd_vma) 1 << ((n) - 1)) - 1) << 1) | 1)
 476
 477 /*
 478 FUNCTION
 479         bfd_check_overflow
 480
 481 SYNOPSIS
 482         bfd_reloc_status_type
 483                 bfd_check_overflow
 484                         (enum complain_overflow how,
 485                          unsigned int bitsize,
 486                          unsigned int rightshift,
 487                          unsigned int addrsize,
 488                          bfd_vma relocation);
 489
 490 DESCRIPTION
 491         Perform overflow checking on @var{relocation} which has
 492         @var{bitsize} significant bits and will be shifted right by
 493         @var{rightshift} bits, on a machine with addresses containing
 494         @var{addrsize} significant bits.  The result is either of
 495         @code{bfd_reloc_ok} or @code{bfd_reloc_overflow}.
 496
 497 */
 498
 499 bfd_reloc_status_type
 500 bfd_check_overflow (how, bitsize, rightshift, addrsize, relocation)
 501      enum complain_overflow how;
 502      unsigned int bitsize;
 503      unsigned int rightshift;
 504      unsigned int addrsize;
 505      bfd_vma relocation;
 506 {
 507   bfd_vma fieldmask, addrmask, signmask, ss, a;
 508   bfd_reloc_status_type flag = bfd_reloc_ok;
 509
 510   a = relocation;
 511
 512   /* Note: BITSIZE should always be <= ADDRSIZE, but in case it's not,
 513      we'll be permissive: extra bits in the field mask will
 514      automatically extend the address mask for purposes of the
 515      overflow check.  */
 516   fieldmask = N_ONES (bitsize);
 517   addrmask = N_ONES (addrsize) | fieldmask;
 518
 519   switch (how)
 520     {
 521     case complain_overflow_dont:
 522       break;
 523
 524     case complain_overflow_signed:
 525       /* If any sign bits are set, all sign bits must be set.  That
 526          is, A must be a valid negative address after shifting.  */
 527       a = (a & addrmask) >> rightshift;
 528       signmask = ~ (fieldmask >> 1);
 529       ss = a & signmask;
 530       if (ss != 0 && ss != ((addrmask >> rightshift) & signmask))
 531         flag = bfd_reloc_overflow;
 532       break;
 533
 534     case complain_overflow_unsigned:
 535       /* We have an overflow if the address does not fit in the field.  */
 536       a = (a & addrmask) >> rightshift;
 537       if ((a & ~ fieldmask) != 0)
 538         flag = bfd_reloc_overflow;
 539       break;
 540
 541     case complain_overflow_bitfield:
 542       /* Bitfields are sometimes signed, sometimes unsigned.  We
 543          explicitly allow an address wrap too, which means a bitfield
 544          of n bits is allowed to store -2**n to 2**n-1.  Thus overflow
 545          if the value has some, but not all, bits set outside the
 546          field.  */
 547       a >>= rightshift;
 548       ss = a & ~ fieldmask;
 549       if (ss != 0 && ss != (((bfd_vma) -1 >> rightshift) & ~ fieldmask))
 550         flag = bfd_reloc_overflow;
 551       break;
 552
 553     default:
 554       abort ();
 555     }
 556
 557   return flag;
 558 }
 559
 560 /*
 561 FUNCTION
 562         bfd_perform_relocation
 563
 564 SYNOPSIS
 565         bfd_reloc_status_type
 566                 bfd_perform_relocation
 567                         (bfd *abfd,
 568                          arelent *reloc_entry,
 569                          PTR data,
 570                          asection *input_section,
 571                          bfd *output_bfd,
 572                          char **error_message);
 573
 574 DESCRIPTION
 575         If @var{output_bfd} is supplied to this function, the
 576         generated image will be relocatable; the relocations are
 577         copied to the output file after they have been changed to
 578         reflect the new state of the world. There are two ways of
 579         reflecting the results of partial linkage in an output file:
 580         by modifying the output data in place, and by modifying the
 581         relocation record.  Some native formats (e.g., basic a.out and
 582         basic coff) have no way of specifying an addend in the
 583         relocation type, so the addend has to go in the output data.
 584         This is no big deal since in these formats the output data
 585         slot will always be big enough for the addend. Complex reloc
 586         types with addends were invented to solve just this problem.
 587         The @var{error_message} argument is set to an error message if
 588         this return @code{bfd_reloc_dangerous}.
 589
 590 */
 591
 592
 593 bfd_reloc_status_type
 594 bfd_perform_relocation (abfd, reloc_entry, data, input_section, output_bfd,
 595                         error_message)
 596      bfd *abfd;
 597      arelent *reloc_entry;
 598      PTR data;
 599      asection *input_section;
 600      bfd *output_bfd;
 601      char **error_message;
 602 {
 603   bfd_vma relocation;
 604   bfd_reloc_status_type flag = bfd_reloc_ok;
 605   bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
 606   bfd_vma output_base = 0;
 607   reloc_howto_type *howto = reloc_entry->howto;
 608   asection *reloc_target_output_section;
 609   asymbol *symbol;
 610
 611   symbol = *(reloc_entry->sym_ptr_ptr);
 612   if (bfd_is_abs_section (symbol->section)
 613       && output_bfd != (bfd *) NULL)
 614     {
 615       reloc_entry->address += input_section->output_offset;
 616       return bfd_reloc_ok;
 617     }
 618
 619   /* If we are not producing relocateable output, return an error if
 620      the symbol is not defined.  An undefined weak symbol is
 621      considered to have a value of zero (SVR4 ABI, p. 4-27).  */
 622   if (bfd_is_und_section (symbol->section)
 623       && (symbol->flags & BSF_WEAK) == 0
 624       && output_bfd == (bfd *) NULL)
 625     flag = bfd_reloc_undefined;
 626
 627   /* If there is a function supplied to handle this relocation type,
 628      call it.  It'll return `bfd_reloc_continue' if further processing
 629      can be done.  */
 630   if (howto->special_function)
 631     {
 632       bfd_reloc_status_type cont;
 633       cont = howto->special_function (abfd, reloc_entry, symbol, data,
 634                                       input_section, output_bfd,
 635                                       error_message);
 636       if (cont != bfd_reloc_continue)
 637         return cont;
 638     }
 639
 640   /* Is the address of the relocation really within the section?  */
 641   if (reloc_entry->address > input_section->_cooked_size /
 642       bfd_octets_per_byte (abfd))
 643     return bfd_reloc_outofrange;
 644
 645   /* Work out which section the relocation is targetted at and the
 646      initial relocation command value.  */
 647
 648   /* Get symbol value.  (Common symbols are special.)  */
 649   if (bfd_is_com_section (symbol->section))
 650     relocation = 0;
 651   else
 652     relocation = symbol->value;
 653
 654
 655   reloc_target_output_section = symbol->section->output_section;
 656
 657   /* Convert input-section-relative symbol value to absolute.  */
 658   if (output_bfd && howto->partial_inplace == false)
 659     output_base = 0;
 660   else
 661     output_base = reloc_target_output_section->vma;
 662
 663   relocation += output_base + symbol->section->output_offset;
 664
 665   /* Add in supplied addend.  */
 666   relocation += reloc_entry->addend;
 667
 668   /* Here the variable relocation holds the final address of the
 669      symbol we are relocating against, plus any addend.  */
 670
 671   if (howto->pc_relative == true)
 672     {
 673       /* This is a PC relative relocation.  We want to set RELOCATION
 674          to the distance between the address of the symbol and the
 675          location.  RELOCATION is already the address of the symbol.
 676
 677          We start by subtracting the address of the section containing
 678          the location.
 679
 680          If pcrel_offset is set, we must further subtract the position
 681          of the location within the section.  Some targets arrange for
 682          the addend to be the negative of the position of the location
 683          within the section; for example, i386-aout does this.  For
 684          i386-aout, pcrel_offset is false.  Some other targets do not
 685          include the position of the location; for example, m88kbcs,
 686          or ELF.  For those targets, pcrel_offset is true.
 687
 688          If we are producing relocateable output, then we must ensure
 689          that this reloc will be correctly computed when the final
 690          relocation is done.  If pcrel_offset is false we want to wind
 691          up with the negative of the location within the section,
 692          which means we must adjust the existing addend by the change
 693          in the location within the section.  If pcrel_offset is true
 694          we do not want to adjust the existing addend at all.
 695
 696          FIXME: This seems logical to me, but for the case of
 697          producing relocateable output it is not what the code
 698          actually does.  I don't want to change it, because it seems
 699          far too likely that something will break.  */
 700
 701       relocation -=
 702         input_section->output_section->vma + input_section->output_offset;
 703
 704       if (howto->pcrel_offset == true)
 705         relocation -= reloc_entry->address;
 706     }
 707
 708   if (output_bfd != (bfd *) NULL)
 709     {
 710       if (howto->partial_inplace == false)
 711         {
 712           /* This is a partial relocation, and we want to apply the relocation
 713              to the reloc entry rather than the raw data. Modify the reloc
 714              inplace to reflect what we now know.  */
 715           reloc_entry->addend = relocation;
 716           reloc_entry->address += input_section->output_offset;
 717           return flag;
 718         }
 719       else
 720         {
 721           /* This is a partial relocation, but inplace, so modify the
 722              reloc record a bit.
 723
 724              If we've relocated with a symbol with a section, change
 725              into a ref to the section belonging to the symbol.  */
 726
 727           reloc_entry->address += input_section->output_offset;
 728
 729           /* WTF?? */
 730           if (abfd->xvec->flavour == bfd_target_coff_flavour
 731               && strcmp (abfd->xvec->name, "coff-Intel-little") != 0
 732               && strcmp (abfd->xvec->name, "coff-Intel-big") != 0)
 733             {
 734 #if 1
 735               /* For m68k-coff, the addend was being subtracted twice during
 736                  relocation with -r.  Removing the line below this comment
 737                  fixes that problem; see PR 2953.
 738
 739 However, Ian wrote the following, regarding removing the line below,
 740 which explains why it is still enabled:  --djm
 741
 742 If you put a patch like that into BFD you need to check all the COFF
 743 linkers.  I am fairly certain that patch will break coff-i386 (e.g.,
 744 SCO); see coff_i386_reloc in coff-i386.c where I worked around the
 745 problem in a different way.  There may very well be a reason that the
 746 code works as it does.
 747
 748 Hmmm.  The first obvious point is that bfd_perform_relocation should
 749 not have any tests that depend upon the flavour.  It's seem like
 750 entirely the wrong place for such a thing.  The second obvious point
 751 is that the current code ignores the reloc addend when producing
 752 relocateable output for COFF.  That's peculiar.  In fact, I really
 753 have no idea what the point of the line you want to remove is.
 754
 755 A typical COFF reloc subtracts the old value of the symbol and adds in
 756 the new value to the location in the object file (if it's a pc
 757 relative reloc it adds the difference between the symbol value and the
 758 location).  When relocating we need to preserve that property.
 759
 760 BFD handles this by setting the addend to the negative of the old
 761 value of the symbol.  Unfortunately it handles common symbols in a
 762 non-standard way (it doesn't subtract the old value) but that's a
 763 different story (we can't change it without losing backward
 764 compatibility with old object files) (coff-i386 does subtract the old
 765 value, to be compatible with existing coff-i386 targets, like SCO).
 766
 767 So everything works fine when not producing relocateable output.  When
 768 we are producing relocateable output, logically we should do exactly
 769 what we do when not producing relocateable output.  Therefore, your
 770 patch is correct.  In fact, it should probably always just set
 771 reloc_entry->addend to 0 for all cases, since it is, in fact, going to
 772 add the value into the object file.  This won't hurt the COFF code,
 773 which doesn't use the addend; I'm not sure what it will do to other
 774 formats (the thing to check for would be whether any formats both use
 775 the addend and set partial_inplace).
 776
 777 When I wanted to make coff-i386 produce relocateable output, I ran
 778 into the problem that you are running into: I wanted to remove that
 779 line.  Rather than risk it, I made the coff-i386 relocs use a special
 780 function; it's coff_i386_reloc in coff-i386.c.  The function
 781 specifically adds the addend field into the object file, knowing that
 782 bfd_perform_relocation is not going to.  If you remove that line, then
 783 coff-i386.c will wind up adding the addend field in twice.  It's
 784 trivial to fix; it just needs to be done.
 785
 786 The problem with removing the line is just that it may break some
 787 working code.  With BFD it's hard to be sure of anything.  The right
 788 way to deal with this is simply to build and test at least all the
 789 supported COFF targets.  It should be straightforward if time and disk
 790 space consuming.  For each target:
 791     1) build the linker
 792     2) generate some executable, and link it using -r (I would
 793        probably use paranoia.o and link against newlib/libc.a, which
 794        for all the supported targets would be available in
 795        /usr/cygnus/progressive/H-host/target/lib/libc.a).
 796     3) make the change to reloc.c
 797     4) rebuild the linker
 798     5) repeat step 2
 799     6) if the resulting object files are the same, you have at least
 800        made it no worse
 801     7) if they are different you have to figure out which version is
 802        right
 803 */
 804               relocation -= reloc_entry->addend;
 805 #endif
 806               reloc_entry->addend = 0;
 807             }
 808           else
 809             {
 810               reloc_entry->addend = relocation;
 811             }
 812         }
 813     }
 814   else
 815     {
 816       reloc_entry->addend = 0;
 817     }
 818
 819   /* FIXME: This overflow checking is incomplete, because the value
 820      might have overflowed before we get here.  For a correct check we
 821      need to compute the value in a size larger than bitsize, but we
 822      can't reasonably do that for a reloc the same size as a host
 823      machine word.
 824      FIXME: We should also do overflow checking on the result after
 825      adding in the value contained in the object file.  */
 826   if (howto->complain_on_overflow != complain_overflow_dont
 827       && flag == bfd_reloc_ok)
 828     flag = bfd_check_overflow (howto->complain_on_overflow,
 829                                howto->bitsize,
 830                                howto->rightshift,
 831                                bfd_arch_bits_per_address (abfd),
 832                                relocation);
 833
 834   /*
 835     Either we are relocating all the way, or we don't want to apply
 836     the relocation to the reloc entry (probably because there isn't
 837     any room in the output format to describe addends to relocs)
 838     */
 839
 840   /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
 841      (OSF version 1.3, compiler version 3.11).  It miscompiles the
 842      following program:
 843
 844      struct str
 845      {
 846        unsigned int i0;
 847      } s = { 0 };
 848
 849      int
 850      main ()
 851      {
 852        unsigned long x;
 853
 854        x = 0x100000000;
 855        x <<= (unsigned long) s.i0;
 856        if (x == 0)
 857          printf ("failed\n");
 858        else
 859          printf ("succeeded (%lx)\n", x);
 860      }
 861      */
 862
 863   relocation >>= (bfd_vma) howto->rightshift;
 864
 865   /* Shift everything up to where it's going to be used */
 866
 867   relocation <<= (bfd_vma) howto->bitpos;
 868
 869   /* Wait for the day when all have the mask in them */
 870
 871   /* What we do:
 872      i instruction to be left alone
 873      o offset within instruction
 874      r relocation offset to apply
 875      S src mask
 876      D dst mask
 877      N ~dst mask
 878      A part 1
 879      B part 2
 880      R result
 881
 882      Do this:
 883      ((  i i i i i o o o o o  from bfd_get<size>
 884      and           S S S S S) to get the size offset we want
 885      +   r r r r r r r r r r) to get the final value to place
 886      and           D D D D D  to chop to right size
 887      -----------------------
 888      =             A A A A A
 889      And this:
 890      (   i i i i i o o o o o  from bfd_get<size>
 891      and N N N N N          ) get instruction
 892      -----------------------
 893      =   B B B B B
 894
 895      And then:
 896      (   B B B B B
 897      or            A A A A A)
 898      -----------------------
 899      =   R R R R R R R R R R  put into bfd_put<size>
 900      */
 901
 902 #define DOIT(x) \
 903   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
 904
 905   switch (howto->size)
 906     {
 907     case 0:
 908       {
 909         char x = bfd_get_8 (abfd, (char *) data + octets);
 910         DOIT (x);
 911         bfd_put_8 (abfd, x, (unsigned char *) data + octets);
 912       }
 913       break;
 914
 915     case 1:
 916       {
 917         short x = bfd_get_16 (abfd, (bfd_byte *) data + octets);
 918         DOIT (x);
 919         bfd_put_16 (abfd, x, (unsigned char *) data + octets);
 920       }
 921       break;
 922     case 2:
 923       {
 924         long x = bfd_get_32 (abfd, (bfd_byte *) data + octets);
 925         DOIT (x);
 926         bfd_put_32 (abfd, x, (bfd_byte *) data + octets);
 927       }
 928       break;
 929     case -2:
 930       {
 931         long x = bfd_get_32 (abfd, (bfd_byte *) data + octets);
 932         relocation = -relocation;
 933         DOIT (x);
 934         bfd_put_32 (abfd, x, (bfd_byte *) data + octets);
 935       }
 936       break;
 937
 938     case -1:
 939       {
 940         long x = bfd_get_16 (abfd, (bfd_byte *) data + octets);
 941         relocation = -relocation;
 942         DOIT (x);
 943         bfd_put_16 (abfd, x, (bfd_byte *) data + octets);
 944       }
 945       break;
 946
 947     case 3:
 948       /* Do nothing */
 949       break;
 950
 951     case 4:
 952 #ifdef BFD64
 953       {
 954         bfd_vma x = bfd_get_64 (abfd, (bfd_byte *) data + octets);
 955         DOIT (x);
 956         bfd_put_64 (abfd, x, (bfd_byte *) data + octets);
 957       }
 958 #else
 959       abort ();
 960 #endif
 961       break;
 962     default:
 963       return bfd_reloc_other;
 964     }
 965
 966   return flag;
 967 }
 968
 969 /*
 970 FUNCTION
 971         bfd_install_relocation
 972
 973 SYNOPSIS
 974         bfd_reloc_status_type
 975                 bfd_install_relocation
 976                         (bfd *abfd,
 977                          arelent *reloc_entry,
 978                          PTR data, bfd_vma data_start,
 979                          asection *input_section,
 980                          char **error_message);
 981
 982 DESCRIPTION
 983         This looks remarkably like <<bfd_perform_relocation>>, except it
 984         does not expect that the section contents have been filled in.
 985         I.e., it's suitable for use when creating, rather than applying
 986         a relocation.
 987
 988         For now, this function should be considered reserved for the
 989         assembler.
 990
 991 */
 992
 993
 994 bfd_reloc_status_type
 995 bfd_install_relocation (abfd, reloc_entry, data_start, data_start_offset,
 996                         input_section, error_message)
 997      bfd *abfd;
 998      arelent *reloc_entry;
 999      PTR data_start;
1000      bfd_vma data_start_offset;
1001      asection *input_section;
1002      char **error_message;
1003 {
1004   bfd_vma relocation;
1005   bfd_reloc_status_type flag = bfd_reloc_ok;
1006   bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
1007   bfd_vma output_base = 0;
1008   reloc_howto_type *howto = reloc_entry->howto;
1009   asection *reloc_target_output_section;
1010   asymbol *symbol;
1011   bfd_byte *data;
1012
1013   symbol = *(reloc_entry->sym_ptr_ptr);
1014   if (bfd_is_abs_section (symbol->section))
1015     {
1016       reloc_entry->address += input_section->output_offset;
1017       return bfd_reloc_ok;
1018     }
1019
1020   /* If there is a function supplied to handle this relocation type,
1021      call it.  It'll return `bfd_reloc_continue' if further processing
1022      can be done.  */
1023   if (howto->special_function)
1024     {
1025       bfd_reloc_status_type cont;
1026
1027       /* XXX - The special_function calls haven't been fixed up to deal
1028          with creating new relocations and section contents.  */
1029       cont = howto->special_function (abfd, reloc_entry, symbol,
1030                                       /* XXX - Non-portable! */
1031                                       ((bfd_byte *) data_start
1032                                        - data_start_offset),
1033                                       input_section, abfd, error_message);
1034       if (cont != bfd_reloc_continue)
1035         return cont;
1036     }
1037
1038   /* Is the address of the relocation really within the section?  */
1039   if (reloc_entry->address > input_section->_cooked_size)
1040     return bfd_reloc_outofrange;
1041
1042   /* Work out which section the relocation is targetted at and the
1043      initial relocation command value.  */
1044
1045   /* Get symbol value.  (Common symbols are special.)  */
1046   if (bfd_is_com_section (symbol->section))
1047     relocation = 0;
1048   else
1049     relocation = symbol->value;
1050
1051   reloc_target_output_section = symbol->section->output_section;
1052
1053   /* Convert input-section-relative symbol value to absolute.  */
1054   if (howto->partial_inplace == false)
1055     output_base = 0;
1056   else
1057     output_base = reloc_target_output_section->vma;
1058
1059   relocation += output_base + symbol->section->output_offset;
1060
1061   /* Add in supplied addend.  */
1062   relocation += reloc_entry->addend;
1063
1064   /* Here the variable relocation holds the final address of the
1065      symbol we are relocating against, plus any addend.  */
1066
1067   if (howto->pc_relative == true)
1068     {
1069       /* This is a PC relative relocation.  We want to set RELOCATION
1070          to the distance between the address of the symbol and the
1071          location.  RELOCATION is already the address of the symbol.
1072
1073          We start by subtracting the address of the section containing
1074          the location.
1075
1076          If pcrel_offset is set, we must further subtract the position
1077          of the location within the section.  Some targets arrange for
1078          the addend to be the negative of the position of the location
1079          within the section; for example, i386-aout does this.  For
1080          i386-aout, pcrel_offset is false.  Some other targets do not
1081          include the position of the location; for example, m88kbcs,
1082          or ELF.  For those targets, pcrel_offset is true.
1083
1084          If we are producing relocateable output, then we must ensure
1085          that this reloc will be correctly computed when the final
1086          relocation is done.  If pcrel_offset is false we want to wind
1087          up with the negative of the location within the section,
1088          which means we must adjust the existing addend by the change
1089          in the location within the section.  If pcrel_offset is true
1090          we do not want to adjust the existing addend at all.
1091
1092          FIXME: This seems logical to me, but for the case of
1093          producing relocateable output it is not what the code
1094          actually does.  I don't want to change it, because it seems
1095          far too likely that something will break.  */
1096
1097       relocation -=
1098         input_section->output_section->vma + input_section->output_offset;
1099
1100       if (howto->pcrel_offset == true && howto->partial_inplace == true)
1101         relocation -= reloc_entry->address;
1102     }
1103
1104   if (howto->partial_inplace == false)
1105     {
1106       /* This is a partial relocation, and we want to apply the relocation
1107          to the reloc entry rather than the raw data. Modify the reloc
1108          inplace to reflect what we now know.  */
1109       reloc_entry->addend = relocation;
1110       reloc_entry->address += input_section->output_offset;
1111       return flag;
1112     }
1113   else
1114     {
1115       /* This is a partial relocation, but inplace, so modify the
1116          reloc record a bit.
1117
1118          If we've relocated with a symbol with a section, change
1119          into a ref to the section belonging to the symbol.  */
1120
1121       reloc_entry->address += input_section->output_offset;
1122
1123       /* WTF?? */
1124       if (abfd->xvec->flavour == bfd_target_coff_flavour
1125           && strcmp (abfd->xvec->name, "coff-Intel-little") != 0
1126           && strcmp (abfd->xvec->name, "coff-Intel-big") != 0)
1127         {
1128 #if 1
1129 /* For m68k-coff, the addend was being subtracted twice during
1130    relocation with -r.  Removing the line below this comment
1131    fixes that problem; see PR 2953.
1132
1133 However, Ian wrote the following, regarding removing the line below,
1134 which explains why it is still enabled:  --djm
1135
1136 If you put a patch like that into BFD you need to check all the COFF
1137 linkers.  I am fairly certain that patch will break coff-i386 (e.g.,
1138 SCO); see coff_i386_reloc in coff-i386.c where I worked around the
1139 problem in a different way.  There may very well be a reason that the
1140 code works as it does.
1141
1142 Hmmm.  The first obvious point is that bfd_install_relocation should
1143 not have any tests that depend upon the flavour.  It's seem like
1144 entirely the wrong place for such a thing.  The second obvious point
1145 is that the current code ignores the reloc addend when producing
1146 relocateable output for COFF.  That's peculiar.  In fact, I really
1147 have no idea what the point of the line you want to remove is.
1148
1149 A typical COFF reloc subtracts the old value of the symbol and adds in
1150 the new value to the location in the object file (if it's a pc
1151 relative reloc it adds the difference between the symbol value and the
1152 location).  When relocating we need to preserve that property.
1153
1154 BFD handles this by setting the addend to the negative of the old
1155 value of the symbol.  Unfortunately it handles common symbols in a
1156 non-standard way (it doesn't subtract the old value) but that's a
1157 different story (we can't change it without losing backward
1158 compatibility with old object files) (coff-i386 does subtract the old
1159 value, to be compatible with existing coff-i386 targets, like SCO).
1160
1161 So everything works fine when not producing relocateable output.  When
1162 we are producing relocateable output, logically we should do exactly
1163 what we do when not producing relocateable output.  Therefore, your
1164 patch is correct.  In fact, it should probably always just set
1165 reloc_entry->addend to 0 for all cases, since it is, in fact, going to
1166 add the value into the object file.  This won't hurt the COFF code,
1167 which doesn't use the addend; I'm not sure what it will do to other
1168 formats (the thing to check for would be whether any formats both use
1169 the addend and set partial_inplace).
1170
1171 When I wanted to make coff-i386 produce relocateable output, I ran
1172 into the problem that you are running into: I wanted to remove that
1173 line.  Rather than risk it, I made the coff-i386 relocs use a special
1174 function; it's coff_i386_reloc in coff-i386.c.  The function
1175 specifically adds the addend field into the object file, knowing that
1176 bfd_install_relocation is not going to.  If you remove that line, then
1177 coff-i386.c will wind up adding the addend field in twice.  It's
1178 trivial to fix; it just needs to be done.
1179
1180 The problem with removing the line is just that it may break some
1181 working code.  With BFD it's hard to be sure of anything.  The right
1182 way to deal with this is simply to build and test at least all the
1183 supported COFF targets.  It should be straightforward if time and disk
1184 space consuming.  For each target:
1185     1) build the linker
1186     2) generate some executable, and link it using -r (I would
1187        probably use paranoia.o and link against newlib/libc.a, which
1188        for all the supported targets would be available in
1189        /usr/cygnus/progressive/H-host/target/lib/libc.a).
1190     3) make the change to reloc.c
1191     4) rebuild the linker
1192     5) repeat step 2
1193     6) if the resulting object files are the same, you have at least
1194        made it no worse
1195     7) if they are different you have to figure out which version is
1196        right
1197 */
1198           relocation -= reloc_entry->addend;
1199 #endif
1200           reloc_entry->addend = 0;
1201         }
1202       else
1203         {
1204           reloc_entry->addend = relocation;
1205         }
1206     }
1207
1208   /* FIXME: This overflow checking is incomplete, because the value
1209      might have overflowed before we get here.  For a correct check we
1210      need to compute the value in a size larger than bitsize, but we
1211      can't reasonably do that for a reloc the same size as a host
1212      machine word.
1213      FIXME: We should also do overflow checking on the result after
1214      adding in the value contained in the object file.  */
1215   if (howto->complain_on_overflow != complain_overflow_dont)
1216     flag = bfd_check_overflow (howto->complain_on_overflow,
1217                                howto->bitsize,
1218                                howto->rightshift,
1219                                bfd_arch_bits_per_address (abfd),
1220                                relocation);
1221
1222   /*
1223     Either we are relocating all the way, or we don't want to apply
1224     the relocation to the reloc entry (probably because there isn't
1225     any room in the output format to describe addends to relocs)
1226     */
1227
1228   /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler
1229      (OSF version 1.3, compiler version 3.11).  It miscompiles the
1230      following program:
1231
1232      struct str
1233      {
1234        unsigned int i0;
1235      } s = { 0 };
1236
1237      int
1238      main ()
1239      {
1240        unsigned long x;
1241
1242        x = 0x100000000;
1243        x <<= (unsigned long) s.i0;
1244        if (x == 0)
1245          printf ("failed\n");
1246        else
1247          printf ("succeeded (%lx)\n", x);
1248      }
1249      */
1250
1251   relocation >>= (bfd_vma) howto->rightshift;
1252
1253   /* Shift everything up to where it's going to be used */
1254
1255   relocation <<= (bfd_vma) howto->bitpos;
1256
1257   /* Wait for the day when all have the mask in them */
1258
1259   /* What we do:
1260      i instruction to be left alone
1261      o offset within instruction
1262      r relocation offset to apply
1263      S src mask
1264      D dst mask
1265      N ~dst mask
1266      A part 1
1267      B part 2
1268      R result
1269
1270      Do this:
1271      ((  i i i i i o o o o o  from bfd_get<size>
1272      and           S S S S S) to get the size offset we want
1273      +   r r r r r r r r r r) to get the final value to place
1274      and           D D D D D  to chop to right size
1275      -----------------------
1276      =             A A A A A
1277      And this:
1278      (   i i i i i o o o o o  from bfd_get<size>
1279      and N N N N N          ) get instruction
1280      -----------------------
1281      =   B B B B B
1282
1283      And then:
1284      (   B B B B B
1285      or            A A A A A)
1286      -----------------------
1287      =   R R R R R R R R R R  put into bfd_put<size>
1288      */
1289
1290 #define DOIT(x) \
1291   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
1292
1293   data = (bfd_byte *) data_start + (octets - data_start_offset);
1294
1295   switch (howto->size)
1296     {
1297     case 0:
1298       {
1299         char x = bfd_get_8 (abfd, (char *) data);
1300         DOIT (x);
1301         bfd_put_8 (abfd, x, (unsigned char *) data);
1302       }
1303       break;
1304
1305     case 1:
1306       {
1307         short x = bfd_get_16 (abfd, (bfd_byte *) data);
1308         DOIT (x);
1309         bfd_put_16 (abfd, x, (unsigned char *) data);
1310       }
1311       break;
1312     case 2:
1313       {
1314         long x = bfd_get_32 (abfd, (bfd_byte *) data);
1315         DOIT (x);
1316         bfd_put_32 (abfd, x, (bfd_byte *) data);
1317       }
1318       break;
1319     case -2:
1320       {
1321         long x = bfd_get_32 (abfd, (bfd_byte *) data);
1322         relocation = -relocation;
1323         DOIT (x);
1324         bfd_put_32 (abfd, x, (bfd_byte *) data);
1325       }
1326       break;
1327
1328     case 3:
1329       /* Do nothing */
1330       break;
1331
1332     case 4:
1333       {
1334         bfd_vma x = bfd_get_64 (abfd, (bfd_byte *) data);
1335         DOIT (x);
1336         bfd_put_64 (abfd, x, (bfd_byte *) data);
1337       }
1338       break;
1339     default:
1340       return bfd_reloc_other;
1341     }
1342
1343   return flag;
1344 }
1345
1346 /* This relocation routine is used by some of the backend linkers.
1347    They do not construct asymbol or arelent structures, so there is no
1348    reason for them to use bfd_perform_relocation.  Also,
1349    bfd_perform_relocation is so hacked up it is easier to write a new
1350    function than to try to deal with it.
1351
1352    This routine does a final relocation.  Whether it is useful for a
1353    relocateable link depends upon how the object format defines
1354    relocations.
1355
1356    FIXME: This routine ignores any special_function in the HOWTO,
1357    since the existing special_function values have been written for
1358    bfd_perform_relocation.
1359
1360    HOWTO is the reloc howto information.
1361    INPUT_BFD is the BFD which the reloc applies to.
1362    INPUT_SECTION is the section which the reloc applies to.
1363    CONTENTS is the contents of the section.
1364    ADDRESS is the address of the reloc within INPUT_SECTION.
1365    VALUE is the value of the symbol the reloc refers to.
1366    ADDEND is the addend of the reloc.  */
1367
1368 bfd_reloc_status_type
1369 _bfd_final_link_relocate (howto, input_bfd, input_section, contents, address,
1370                           value, addend)
1371      reloc_howto_type *howto;
1372      bfd *input_bfd;
1373      asection *input_section;
1374      bfd_byte *contents;
1375      bfd_vma address;
1376      bfd_vma value;
1377      bfd_vma addend;
1378 {
1379   bfd_vma relocation;
1380
1381   /* Sanity check the address.  */
1382   if (address > input_section->_raw_size)
1383     return bfd_reloc_outofrange;
1384
1385   /* This function assumes that we are dealing with a basic relocation
1386      against a symbol.  We want to compute the value of the symbol to
1387      relocate to.  This is just VALUE, the value of the symbol, plus
1388      ADDEND, any addend associated with the reloc.  */
1389   relocation = value + addend;
1390
1391   /* If the relocation is PC relative, we want to set RELOCATION to
1392      the distance between the symbol (currently in RELOCATION) and the
1393      location we are relocating.  Some targets (e.g., i386-aout)
1394      arrange for the contents of the section to be the negative of the
1395      offset of the location within the section; for such targets
1396      pcrel_offset is false.  Other targets (e.g., m88kbcs or ELF)
1397      simply leave the contents of the section as zero; for such
1398      targets pcrel_offset is true.  If pcrel_offset is false we do not
1399      need to subtract out the offset of the location within the
1400      section (which is just ADDRESS).  */
1401   if (howto->pc_relative)
1402     {
1403       relocation -= (input_section->output_section->vma
1404                      + input_section->output_offset);
1405       if (howto->pcrel_offset)
1406         relocation -= address;
1407     }
1408
1409   return _bfd_relocate_contents (howto, input_bfd, relocation,
1410                                  contents + address);
1411 }
1412
1413 /* Relocate a given location using a given value and howto.  */
1414
1415 bfd_reloc_status_type
1416 _bfd_relocate_contents (howto, input_bfd, relocation, location)
1417      reloc_howto_type *howto;
1418      bfd *input_bfd;
1419      bfd_vma relocation;
1420      bfd_byte *location;
1421 {
1422   int size;
1423   bfd_vma x = 0;
1424   bfd_reloc_status_type flag;
1425   unsigned int rightshift = howto->rightshift;
1426   unsigned int bitpos = howto->bitpos;
1427
1428   /* If the size is negative, negate RELOCATION.  This isn't very
1429      general.  */
1430   if (howto->size < 0)
1431     relocation = -relocation;
1432
1433   /* Get the value we are going to relocate.  */
1434   size = bfd_get_reloc_size (howto);
1435   switch (size)
1436     {
1437     default:
1438     case 0:
1439       abort ();
1440     case 1:
1441       x = bfd_get_8 (input_bfd, location);
1442       break;
1443     case 2:
1444       x = bfd_get_16 (input_bfd, location);
1445       break;
1446     case 4:
1447       x = bfd_get_32 (input_bfd, location);
1448       break;
1449     case 8:
1450 #ifdef BFD64
1451       x = bfd_get_64 (input_bfd, location);
1452 #else
1453       abort ();
1454 #endif
1455       break;
1456     }
1457
1458   /* Check for overflow.  FIXME: We may drop bits during the addition
1459      which we don't check for.  We must either check at every single
1460      operation, which would be tedious, or we must do the computations
1461      in a type larger than bfd_vma, which would be inefficient.  */
1462   flag = bfd_reloc_ok;
1463   if (howto->complain_on_overflow != complain_overflow_dont)
1464     {
1465       bfd_vma addrmask, fieldmask, signmask, ss;
1466       bfd_vma a, b, sum;
1467
1468       /* Get the values to be added together.  For signed and unsigned
1469          relocations, we assume that all values should be truncated to
1470          the size of an address.  For bitfields, all the bits matter.
1471          See also bfd_check_overflow.  */
1472       fieldmask = N_ONES (howto->bitsize);
1473       addrmask = N_ONES (bfd_arch_bits_per_address (input_bfd)) | fieldmask;
1474       a = relocation;
1475       b = x & howto->src_mask;
1476
1477       switch (howto->complain_on_overflow)
1478         {
1479         case complain_overflow_signed:
1480           a = (a & addrmask) >> rightshift;
1481
1482           /* If any sign bits are set, all sign bits must be set.
1483              That is, A must be a valid negative address after
1484              shifting.  */
1485           signmask = ~ (fieldmask >> 1);
1486           ss = a & signmask;
1487           if (ss != 0 && ss != ((addrmask >> rightshift) & signmask))
1488             flag = bfd_reloc_overflow;
1489
1490           /* We only need this next bit of code if the sign bit of B
1491              is below the sign bit of A.  This would only happen if
1492              SRC_MASK had fewer bits than BITSIZE.  Note that if
1493              SRC_MASK has more bits than BITSIZE, we can get into
1494              trouble; we would need to verify that B is in range, as
1495              we do for A above.  */
1496           signmask = ((~ howto->src_mask) >> 1) & howto->src_mask;
1497
1498           /* Set all the bits above the sign bit.  */
1499           b = (b ^ signmask) - signmask;
1500
1501           b = (b & addrmask) >> bitpos;
1502
1503           /* Now we can do the addition.  */
1504           sum = a + b;
1505
1506           /* See if the result has the correct sign.  Bits above the
1507              sign bit are junk now; ignore them.  If the sum is
1508              positive, make sure we did not have all negative inputs;
1509              if the sum is negative, make sure we did not have all
1510              positive inputs.  The test below looks only at the sign
1511              bits, and it really just
1512                  SIGN (A) == SIGN (B) && SIGN (A) != SIGN (SUM)
1513              */
1514           signmask = (fieldmask >> 1) + 1;
1515           if (((~ (a ^ b)) & (a ^ sum)) & signmask)
1516             flag = bfd_reloc_overflow;
1517
1518           break;
1519
1520         case complain_overflow_unsigned:
1521           /* Checking for an unsigned overflow is relatively easy:
1522              trim the addresses and add, and trim the result as well.
1523              Overflow is normally indicated when the result does not
1524              fit in the field.  However, we also need to consider the
1525              case when, e.g., fieldmask is 0x7fffffff or smaller, an
1526              input is 0x80000000, and bfd_vma is only 32 bits; then we
1527              will get sum == 0, but there is an overflow, since the
1528              inputs did not fit in the field.  Instead of doing a
1529              separate test, we can check for this by or-ing in the
1530              operands when testing for the sum overflowing its final
1531              field.  */
1532           a = (a & addrmask) >> rightshift;
1533           b = (b & addrmask) >> bitpos;
1534           sum = (a + b) & addrmask;
1535           if ((a | b | sum) & ~ fieldmask)
1536             flag = bfd_reloc_overflow;
1537
1538           break;
1539
1540         case complain_overflow_bitfield:
1541           /* Much like the signed check, but for a field one bit
1542              wider, and no trimming inputs with addrmask.  We allow a
1543              bitfield to represent numbers in the range -2**n to
1544              2**n-1, where n is the number of bits in the field.
1545              Note that when bfd_vma is 32 bits, a 32-bit reloc can't
1546              overflow, which is exactly what we want.  */
1547           a >>= rightshift;
1548
1549           signmask = ~ fieldmask;
1550           ss = a & signmask;
1551           if (ss != 0 && ss != (((bfd_vma) -1 >> rightshift) & signmask))
1552             flag = bfd_reloc_overflow;
1553
1554           signmask = ((~ howto->src_mask) >> 1) & howto->src_mask;
1555           b = (b ^ signmask) - signmask;
1556
1557           b >>= bitpos;
1558
1559           sum = a + b;
1560
1561           /* We mask with addrmask here to explicitly allow an address
1562              wrap-around.  The Linux kernel relies on it, and it is
1563              the only way to write assembler code which can run when
1564              loaded at a location 0x80000000 away from the location at
1565              which it is linked.  */
1566           signmask = fieldmask + 1;
1567           if (((~ (a ^ b)) & (a ^ sum)) & signmask & addrmask)
1568             flag = bfd_reloc_overflow;
1569
1570           break;
1571
1572         default:
1573           abort ();
1574         }
1575     }
1576
1577   /* Put RELOCATION in the right bits.  */
1578   relocation >>= (bfd_vma) rightshift;
1579   relocation <<= (bfd_vma) bitpos;
1580
1581   /* Add RELOCATION to the right bits of X.  */
1582   x = ((x & ~howto->dst_mask)
1583        | (((x & howto->src_mask) + relocation) & howto->dst_mask));
1584
1585   /* Put the relocated value back in the object file.  */
1586   switch (size)
1587     {
1588     default:
1589     case 0:
1590       abort ();
1591     case 1:
1592       bfd_put_8 (input_bfd, x, location);
1593       break;
1594     case 2:
1595       bfd_put_16 (input_bfd, x, location);
1596       break;
1597     case 4:
1598       bfd_put_32 (input_bfd, x, location);
1599       break;
1600     case 8:
1601 #ifdef BFD64
1602       bfd_put_64 (input_bfd, x, location);
1603 #else
1604       abort ();
1605 #endif
1606       break;
1607     }
1608
1609   return flag;
1610 }
1611
1612 /*
1613 DOCDD
1614 INODE
1615         howto manager,  , typedef arelent, Relocations
1616
1617 SECTION
1618         The howto manager
1619
1620         When an application wants to create a relocation, but doesn't
1621         know what the target machine might call it, it can find out by
1622         using this bit of code.
1623
1624 */
1625
1626 /*
1627 TYPEDEF
1628         bfd_reloc_code_type
1629
1630 DESCRIPTION
1631         The insides of a reloc code.  The idea is that, eventually, there
1632         will be one enumerator for every type of relocation we ever do.
1633         Pass one of these values to <<bfd_reloc_type_lookup>>, and it'll
1634         return a howto pointer.
1635
1636         This does mean that the application must determine the correct
1637         enumerator value; you can't get a howto pointer from a random set
1638         of attributes.
1639
1640 SENUM
1641    bfd_reloc_code_real
1642
1643 ENUM
1644   BFD_RELOC_64
1645 ENUMX
1646   BFD_RELOC_32
1647 ENUMX
1648   BFD_RELOC_26
1649 ENUMX
1650   BFD_RELOC_24
1651 ENUMX
1652   BFD_RELOC_16
1653 ENUMX
1654   BFD_RELOC_14
1655 ENUMX
1656   BFD_RELOC_8
1657 ENUMDOC
1658   Basic absolute relocations of N bits.
1659
1660 ENUM
1661   BFD_RELOC_64_PCREL
1662 ENUMX
1663   BFD_RELOC_32_PCREL
1664 ENUMX
1665   BFD_RELOC_24_PCREL
1666 ENUMX
1667   BFD_RELOC_16_PCREL
1668 ENUMX
1669   BFD_RELOC_12_PCREL
1670 ENUMX
1671   BFD_RELOC_8_PCREL
1672 ENUMDOC
1673   PC-relative relocations.  Sometimes these are relative to the address
1674 of the relocation itself; sometimes they are relative to the start of
1675 the section containing the relocation.  It depends on the specific target.
1676
1677 The 24-bit relocation is used in some Intel 960 configurations.
1678
1679 ENUM
1680   BFD_RELOC_32_GOT_PCREL
1681 ENUMX
1682   BFD_RELOC_16_GOT_PCREL
1683 ENUMX
1684   BFD_RELOC_8_GOT_PCREL
1685 ENUMX
1686   BFD_RELOC_32_GOTOFF
1687 ENUMX
1688   BFD_RELOC_16_GOTOFF
1689 ENUMX
1690   BFD_RELOC_LO16_GOTOFF
1691 ENUMX
1692   BFD_RELOC_HI16_GOTOFF
1693 ENUMX
1694   BFD_RELOC_HI16_S_GOTOFF
1695 ENUMX
1696   BFD_RELOC_8_GOTOFF
1697 ENUMX
1698   BFD_RELOC_32_PLT_PCREL
1699 ENUMX
1700   BFD_RELOC_24_PLT_PCREL
1701 ENUMX
1702   BFD_RELOC_16_PLT_PCREL
1703 ENUMX
1704   BFD_RELOC_8_PLT_PCREL
1705 ENUMX
1706   BFD_RELOC_32_PLTOFF
1707 ENUMX
1708   BFD_RELOC_16_PLTOFF
1709 ENUMX
1710   BFD_RELOC_LO16_PLTOFF
1711 ENUMX
1712   BFD_RELOC_HI16_PLTOFF
1713 ENUMX
1714   BFD_RELOC_HI16_S_PLTOFF
1715 ENUMX
1716   BFD_RELOC_8_PLTOFF
1717 ENUMDOC
1718   For ELF.
1719
1720 ENUM
1721   BFD_RELOC_68K_GLOB_DAT
1722 ENUMX
1723   BFD_RELOC_68K_JMP_SLOT
1724 ENUMX
1725   BFD_RELOC_68K_RELATIVE
1726 ENUMDOC
1727   Relocations used by 68K ELF.
1728
1729 ENUM
1730   BFD_RELOC_32_BASEREL
1731 ENUMX
1732   BFD_RELOC_16_BASEREL
1733 ENUMX
1734   BFD_RELOC_LO16_BASEREL
1735 ENUMX
1736   BFD_RELOC_HI16_BASEREL
1737 ENUMX
1738   BFD_RELOC_HI16_S_BASEREL
1739 ENUMX
1740   BFD_RELOC_8_BASEREL
1741 ENUMX
1742   BFD_RELOC_RVA
1743 ENUMDOC
1744   Linkage-table relative.
1745
1746 ENUM
1747   BFD_RELOC_8_FFnn
1748 ENUMDOC
1749   Absolute 8-bit relocation, but used to form an address like 0xFFnn.
1750
1751 ENUM
1752   BFD_RELOC_32_PCREL_S2
1753 ENUMX
1754   BFD_RELOC_16_PCREL_S2
1755 ENUMX
1756   BFD_RELOC_23_PCREL_S2
1757 ENUMDOC
1758   These PC-relative relocations are stored as word displacements --
1759 i.e., byte displacements shifted right two bits.  The 30-bit word
1760 displacement (<<32_PCREL_S2>> -- 32 bits, shifted 2) is used on the
1761 SPARC.  (SPARC tools generally refer to this as <<WDISP30>>.)  The
1762 signed 16-bit displacement is used on the MIPS, and the 23-bit
1763 displacement is used on the Alpha.
1764
1765 ENUM
1766   BFD_RELOC_HI22
1767 ENUMX
1768   BFD_RELOC_LO10
1769 ENUMDOC
1770   High 22 bits and low 10 bits of 32-bit value, placed into lower bits of
1771 the target word.  These are used on the SPARC.
1772
1773 ENUM
1774   BFD_RELOC_GPREL16
1775 ENUMX
1776   BFD_RELOC_GPREL32
1777 ENUMDOC
1778   For systems that allocate a Global Pointer register, these are
1779 displacements off that register.  These relocation types are
1780 handled specially, because the value the register will have is
1781 decided relatively late.
1782
1783
1784 ENUM
1785   BFD_RELOC_I960_CALLJ
1786 ENUMDOC
1787   Reloc types used for i960/b.out.
1788
1789 ENUM
1790   BFD_RELOC_NONE
1791 ENUMX
1792   BFD_RELOC_SPARC_WDISP22
1793 ENUMX
1794   BFD_RELOC_SPARC22
1795 ENUMX
1796   BFD_RELOC_SPARC13
1797 ENUMX
1798   BFD_RELOC_SPARC_GOT10
1799 ENUMX
1800   BFD_RELOC_SPARC_GOT13
1801 ENUMX
1802   BFD_RELOC_SPARC_GOT22
1803 ENUMX
1804   BFD_RELOC_SPARC_PC10
1805 ENUMX
1806   BFD_RELOC_SPARC_PC22
1807 ENUMX
1808   BFD_RELOC_SPARC_WPLT30
1809 ENUMX
1810   BFD_RELOC_SPARC_COPY
1811 ENUMX
1812   BFD_RELOC_SPARC_GLOB_DAT
1813 ENUMX
1814   BFD_RELOC_SPARC_JMP_SLOT
1815 ENUMX
1816   BFD_RELOC_SPARC_RELATIVE
1817 ENUMX
1818   BFD_RELOC_SPARC_UA32
1819 ENUMDOC
1820   SPARC ELF relocations.  There is probably some overlap with other
1821   relocation types already defined.
1822
1823 ENUM
1824   BFD_RELOC_SPARC_BASE13
1825 ENUMX
1826   BFD_RELOC_SPARC_BASE22
1827 ENUMDOC
1828   I think these are specific to SPARC a.out (e.g., Sun 4).
1829
1830 ENUMEQ
1831   BFD_RELOC_SPARC_64
1832   BFD_RELOC_64
1833 ENUMX
1834   BFD_RELOC_SPARC_10
1835 ENUMX
1836   BFD_RELOC_SPARC_11
1837 ENUMX
1838   BFD_RELOC_SPARC_OLO10
1839 ENUMX
1840   BFD_RELOC_SPARC_HH22
1841 ENUMX
1842   BFD_RELOC_SPARC_HM10
1843 ENUMX
1844   BFD_RELOC_SPARC_LM22
1845 ENUMX
1846   BFD_RELOC_SPARC_PC_HH22
1847 ENUMX
1848   BFD_RELOC_SPARC_PC_HM10
1849 ENUMX
1850   BFD_RELOC_SPARC_PC_LM22
1851 ENUMX
1852   BFD_RELOC_SPARC_WDISP16
1853 ENUMX
1854   BFD_RELOC_SPARC_WDISP19
1855 ENUMX
1856   BFD_RELOC_SPARC_7
1857 ENUMX
1858   BFD_RELOC_SPARC_6
1859 ENUMX
1860   BFD_RELOC_SPARC_5
1861 ENUMEQX
1862   BFD_RELOC_SPARC_DISP64
1863   BFD_RELOC_64_PCREL
1864 ENUMX
1865   BFD_RELOC_SPARC_PLT64
1866 ENUMX
1867   BFD_RELOC_SPARC_HIX22
1868 ENUMX
1869   BFD_RELOC_SPARC_LOX10
1870 ENUMX
1871   BFD_RELOC_SPARC_H44
1872 ENUMX
1873   BFD_RELOC_SPARC_M44
1874 ENUMX
1875   BFD_RELOC_SPARC_L44
1876 ENUMX
1877   BFD_RELOC_SPARC_REGISTER
1878 ENUMDOC
1879   SPARC64 relocations
1880
1881 ENUM
1882   BFD_RELOC_SPARC_REV32
1883 ENUMDOC
1884   SPARC little endian relocation
1885
1886 ENUM
1887   BFD_RELOC_ALPHA_GPDISP_HI16
1888 ENUMDOC
1889   Alpha ECOFF and ELF relocations.  Some of these treat the symbol or
1890      "addend" in some special way.
1891   For GPDISP_HI16 ("gpdisp") relocations, the symbol is ignored when
1892      writing; when reading, it will be the absolute section symbol.  The
1893      addend is the displacement in bytes of the "lda" instruction from
1894      the "ldah" instruction (which is at the address of this reloc).
1895 ENUM
1896   BFD_RELOC_ALPHA_GPDISP_LO16
1897 ENUMDOC
1898   For GPDISP_LO16 ("ignore") relocations, the symbol is handled as
1899      with GPDISP_HI16 relocs.  The addend is ignored when writing the
1900      relocations out, and is filled in with the file's GP value on
1901      reading, for convenience.
1902
1903 ENUM
1904   BFD_RELOC_ALPHA_GPDISP
1905 ENUMDOC
1906   The ELF GPDISP relocation is exactly the same as the GPDISP_HI16
1907      relocation except that there is no accompanying GPDISP_LO16
1908      relocation.
1909
1910 ENUM
1911   BFD_RELOC_ALPHA_LITERAL
1912 ENUMX
1913   BFD_RELOC_ALPHA_ELF_LITERAL
1914 ENUMX
1915   BFD_RELOC_ALPHA_LITUSE
1916 ENUMDOC
1917   The Alpha LITERAL/LITUSE relocs are produced by a symbol reference;
1918      the assembler turns it into a LDQ instruction to load the address of
1919      the symbol, and then fills in a register in the real instruction.
1920
1921      The LITERAL reloc, at the LDQ instruction, refers to the .lita
1922      section symbol.  The addend is ignored when writing, but is filled
1923      in with the file's GP value on reading, for convenience, as with the
1924      GPDISP_LO16 reloc.
1925
1926      The ELF_LITERAL reloc is somewhere between 16_GOTOFF and GPDISP_LO16.
1927      It should refer to the symbol to be referenced, as with 16_GOTOFF,
1928      but it generates output not based on the position within the .got
1929      section, but relative to the GP value chosen for the file during the
1930      final link stage.
1931
1932      The LITUSE reloc, on the instruction using the loaded address, gives
1933      information to the linker that it might be able to use to optimize
1934      away some literal section references.  The symbol is ignored (read
1935      as the absolute section symbol), and the "addend" indicates the type
1936      of instruction using the register:
1937               1 - "memory" fmt insn
1938               2 - byte-manipulation (byte offset reg)
1939               3 - jsr (target of branch)
1940
1941      The GNU linker currently doesn't do any of this optimizing.
1942
1943 ENUM
1944   BFD_RELOC_ALPHA_USER_LITERAL
1945 ENUMX
1946   BFD_RELOC_ALPHA_USER_LITUSE_BASE
1947 ENUMX
1948   BFD_RELOC_ALPHA_USER_LITUSE_BYTOFF
1949 ENUMX
1950   BFD_RELOC_ALPHA_USER_LITUSE_JSR
1951 ENUMX
1952   BFD_RELOC_ALPHA_USER_GPDISP
1953 ENUMX
1954   BFD_RELOC_ALPHA_USER_GPRELHIGH
1955 ENUMX
1956   BFD_RELOC_ALPHA_USER_GPRELLOW
1957 ENUMDOC
1958   The BFD_RELOC_ALPHA_USER_* relocations are used by the assembler to
1959      process the explicit !<reloc>!sequence relocations, and are mapped
1960      into the normal relocations at the end of processing.
1961
1962 ENUM
1963   BFD_RELOC_ALPHA_HINT
1964 ENUMDOC
1965   The HINT relocation indicates a value that should be filled into the
1966      "hint" field of a jmp/jsr/ret instruction, for possible branch-
1967      prediction logic which may be provided on some processors.
1968
1969 ENUM
1970   BFD_RELOC_ALPHA_LINKAGE
1971 ENUMDOC
1972   The LINKAGE relocation outputs a linkage pair in the object file,
1973      which is filled by the linker.
1974
1975 ENUM
1976   BFD_RELOC_ALPHA_CODEADDR
1977 ENUMDOC
1978   The CODEADDR relocation outputs a STO_CA in the object file,
1979      which is filled by the linker.
1980
1981 ENUM
1982   BFD_RELOC_MIPS_JMP
1983 ENUMDOC
1984   Bits 27..2 of the relocation address shifted right 2 bits;
1985      simple reloc otherwise.
1986
1987 ENUM
1988   BFD_RELOC_MIPS16_JMP
1989 ENUMDOC
1990   The MIPS16 jump instruction.
1991
1992 ENUM
1993   BFD_RELOC_MIPS16_GPREL
1994 ENUMDOC
1995   MIPS16 GP relative reloc.
1996
1997 ENUM
1998   BFD_RELOC_HI16
1999 ENUMDOC
2000   High 16 bits of 32-bit value; simple reloc.
2001 ENUM
2002   BFD_RELOC_HI16_S
2003 ENUMDOC
2004   High 16 bits of 32-bit value but the low 16 bits will be sign
2005      extended and added to form the final result.  If the low 16
2006      bits form a negative number, we need to add one to the high value
2007      to compensate for the borrow when the low bits are added.
2008 ENUM
2009   BFD_RELOC_LO16
2010 ENUMDOC
2011   Low 16 bits.
2012 ENUM
2013   BFD_RELOC_PCREL_HI16_S
2014 ENUMDOC
2015   Like BFD_RELOC_HI16_S, but PC relative.
2016 ENUM
2017   BFD_RELOC_PCREL_LO16
2018 ENUMDOC
2019   Like BFD_RELOC_LO16, but PC relative.
2020
2021 ENUMEQ
2022   BFD_RELOC_MIPS_GPREL
2023   BFD_RELOC_GPREL16
2024 ENUMDOC
2025   Relocation relative to the global pointer.
2026
2027 ENUM
2028   BFD_RELOC_MIPS_LITERAL
2029 ENUMDOC
2030   Relocation against a MIPS literal section.
2031
2032 ENUM
2033   BFD_RELOC_MIPS_GOT16
2034 ENUMX
2035   BFD_RELOC_MIPS_CALL16
2036 ENUMEQX
2037   BFD_RELOC_MIPS_GPREL32
2038   BFD_RELOC_GPREL32
2039 ENUMX
2040   BFD_RELOC_MIPS_GOT_HI16
2041 ENUMX
2042   BFD_RELOC_MIPS_GOT_LO16
2043 ENUMX
2044   BFD_RELOC_MIPS_CALL_HI16
2045 ENUMX
2046   BFD_RELOC_MIPS_CALL_LO16
2047 ENUMX
2048   BFD_RELOC_MIPS_SUB
2049 ENUMX
2050   BFD_RELOC_MIPS_GOT_PAGE
2051 ENUMX
2052   BFD_RELOC_MIPS_GOT_OFST
2053 ENUMX
2054   BFD_RELOC_MIPS_GOT_DISP
2055 COMMENT
2056 ENUMDOC
2057   MIPS ELF relocations.
2058
2059 COMMENT
2060
2061 ENUM
2062   BFD_RELOC_386_GOT32
2063 ENUMX
2064   BFD_RELOC_386_PLT32
2065 ENUMX
2066   BFD_RELOC_386_COPY
2067 ENUMX
2068   BFD_RELOC_386_GLOB_DAT
2069 ENUMX
2070   BFD_RELOC_386_JUMP_SLOT
2071 ENUMX
2072   BFD_RELOC_386_RELATIVE
2073 ENUMX
2074   BFD_RELOC_386_GOTOFF
2075 ENUMX
2076   BFD_RELOC_386_GOTPC
2077 ENUMDOC
2078   i386/elf relocations
2079
2080 ENUM
2081   BFD_RELOC_NS32K_IMM_8
2082 ENUMX
2083   BFD_RELOC_NS32K_IMM_16
2084 ENUMX
2085   BFD_RELOC_NS32K_IMM_32
2086 ENUMX
2087   BFD_RELOC_NS32K_IMM_8_PCREL
2088 ENUMX
2089   BFD_RELOC_NS32K_IMM_16_PCREL
2090 ENUMX
2091   BFD_RELOC_NS32K_IMM_32_PCREL
2092 ENUMX
2093   BFD_RELOC_NS32K_DISP_8
2094 ENUMX
2095   BFD_RELOC_NS32K_DISP_16
2096 ENUMX
2097   BFD_RELOC_NS32K_DISP_32
2098 ENUMX
2099   BFD_RELOC_NS32K_DISP_8_PCREL
2100 ENUMX
2101   BFD_RELOC_NS32K_DISP_16_PCREL
2102 ENUMX
2103   BFD_RELOC_NS32K_DISP_32_PCREL
2104 ENUMDOC
2105   ns32k relocations
2106
2107 ENUM
2108   BFD_RELOC_PJ_CODE_HI16
2109 ENUMX
2110   BFD_RELOC_PJ_CODE_LO16
2111 ENUMX
2112   BFD_RELOC_PJ_CODE_DIR16
2113 ENUMX
2114   BFD_RELOC_PJ_CODE_DIR32
2115 ENUMX
2116   BFD_RELOC_PJ_CODE_REL16
2117 ENUMX
2118   BFD_RELOC_PJ_CODE_REL32
2119 ENUMDOC
2120   Picojava relocs.  Not all of these appear in object files.
2121
2122 ENUM
2123   BFD_RELOC_PPC_B26
2124 ENUMX
2125   BFD_RELOC_PPC_BA26
2126 ENUMX
2127   BFD_RELOC_PPC_TOC16
2128 ENUMX
2129   BFD_RELOC_PPC_B16
2130 ENUMX
2131   BFD_RELOC_PPC_B16_BRTAKEN
2132 ENUMX
2133   BFD_RELOC_PPC_B16_BRNTAKEN
2134 ENUMX
2135   BFD_RELOC_PPC_BA16
2136 ENUMX
2137   BFD_RELOC_PPC_BA16_BRTAKEN
2138 ENUMX
2139   BFD_RELOC_PPC_BA16_BRNTAKEN
2140 ENUMX
2141   BFD_RELOC_PPC_COPY
2142 ENUMX
2143   BFD_RELOC_PPC_GLOB_DAT
2144 ENUMX
2145   BFD_RELOC_PPC_JMP_SLOT
2146 ENUMX
2147   BFD_RELOC_PPC_RELATIVE
2148 ENUMX
2149   BFD_RELOC_PPC_LOCAL24PC
2150 ENUMX
2151   BFD_RELOC_PPC_EMB_NADDR32
2152 ENUMX
2153   BFD_RELOC_PPC_EMB_NADDR16
2154 ENUMX
2155   BFD_RELOC_PPC_EMB_NADDR16_LO
2156 ENUMX
2157   BFD_RELOC_PPC_EMB_NADDR16_HI
2158 ENUMX
2159   BFD_RELOC_PPC_EMB_NADDR16_HA
2160 ENUMX
2161   BFD_RELOC_PPC_EMB_SDAI16
2162 ENUMX
2163   BFD_RELOC_PPC_EMB_SDA2I16
2164 ENUMX
2165   BFD_RELOC_PPC_EMB_SDA2REL
2166 ENUMX
2167   BFD_RELOC_PPC_EMB_SDA21
2168 ENUMX
2169   BFD_RELOC_PPC_EMB_MRKREF
2170 ENUMX
2171   BFD_RELOC_PPC_EMB_RELSEC16
2172 ENUMX
2173   BFD_RELOC_PPC_EMB_RELST_LO
2174 ENUMX
2175   BFD_RELOC_PPC_EMB_RELST_HI
2176 ENUMX
2177   BFD_RELOC_PPC_EMB_RELST_HA
2178 ENUMX
2179   BFD_RELOC_PPC_EMB_BIT_FLD
2180 ENUMX
2181   BFD_RELOC_PPC_EMB_RELSDA
2182 ENUMDOC
2183   Power(rs6000) and PowerPC relocations.
2184
2185 ENUM
2186   BFD_RELOC_I370_D12
2187 ENUMDOC
2188   IBM 370/390 relocations
2189
2190 ENUM
2191   BFD_RELOC_CTOR
2192 ENUMDOC
2193   The type of reloc used to build a contructor table - at the moment
2194   probably a 32 bit wide absolute relocation, but the target can choose.
2195   It generally does map to one of the other relocation types.
2196
2197 ENUM
2198   BFD_RELOC_ARM_PCREL_BRANCH
2199 ENUMDOC
2200   ARM 26 bit pc-relative branch.  The lowest two bits must be zero and are
2201   not stored in the instruction.
2202 ENUM
2203   BFD_RELOC_ARM_PCREL_BLX
2204 ENUMDOC
2205   ARM 26 bit pc-relative branch.  The lowest bit must be zero and is
2206   not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
2207   field in the instruction.
2208 ENUM
2209   BFD_RELOC_THUMB_PCREL_BLX
2210 ENUMDOC
2211   Thumb 22 bit pc-relative branch.  The lowest bit must be zero and is
2212   not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
2213   field in the instruction.
2214 ENUM
2215   BFD_RELOC_ARM_IMMEDIATE
2216 ENUMX
2217   BFD_RELOC_ARM_ADRL_IMMEDIATE
2218 ENUMX
2219   BFD_RELOC_ARM_OFFSET_IMM
2220 ENUMX
2221   BFD_RELOC_ARM_SHIFT_IMM
2222 ENUMX
2223   BFD_RELOC_ARM_SWI
2224 ENUMX
2225   BFD_RELOC_ARM_MULTI
2226 ENUMX
2227   BFD_RELOC_ARM_CP_OFF_IMM
2228 ENUMX
2229   BFD_RELOC_ARM_ADR_IMM
2230 ENUMX
2231   BFD_RELOC_ARM_LDR_IMM
2232 ENUMX
2233   BFD_RELOC_ARM_LITERAL
2234 ENUMX
2235   BFD_RELOC_ARM_IN_POOL
2236 ENUMX
2237   BFD_RELOC_ARM_OFFSET_IMM8
2238 ENUMX
2239   BFD_RELOC_ARM_HWLITERAL
2240 ENUMX
2241   BFD_RELOC_ARM_THUMB_ADD
2242 ENUMX
2243   BFD_RELOC_ARM_THUMB_IMM
2244 ENUMX
2245   BFD_RELOC_ARM_THUMB_SHIFT
2246 ENUMX
2247   BFD_RELOC_ARM_THUMB_OFFSET
2248 ENUMX
2249   BFD_RELOC_ARM_GOT12
2250 ENUMX
2251   BFD_RELOC_ARM_GOT32
2252 ENUMX
2253   BFD_RELOC_ARM_JUMP_SLOT
2254 ENUMX
2255   BFD_RELOC_ARM_COPY
2256 ENUMX
2257   BFD_RELOC_ARM_GLOB_DAT
2258 ENUMX
2259   BFD_RELOC_ARM_PLT32
2260 ENUMX
2261   BFD_RELOC_ARM_RELATIVE
2262 ENUMX
2263   BFD_RELOC_ARM_GOTOFF
2264 ENUMX
2265   BFD_RELOC_ARM_GOTPC
2266 ENUMDOC
2267   These relocs are only used within the ARM assembler.  They are not
2268   (at present) written to any object files.
2269
2270 ENUM
2271   BFD_RELOC_SH_PCDISP8BY2
2272 ENUMX
2273   BFD_RELOC_SH_PCDISP12BY2
2274 ENUMX
2275   BFD_RELOC_SH_IMM4
2276 ENUMX
2277   BFD_RELOC_SH_IMM4BY2
2278 ENUMX
2279   BFD_RELOC_SH_IMM4BY4
2280 ENUMX
2281   BFD_RELOC_SH_IMM8
2282 ENUMX
2283   BFD_RELOC_SH_IMM8BY2
2284 ENUMX
2285   BFD_RELOC_SH_IMM8BY4
2286 ENUMX
2287   BFD_RELOC_SH_PCRELIMM8BY2
2288 ENUMX
2289   BFD_RELOC_SH_PCRELIMM8BY4
2290 ENUMX
2291   BFD_RELOC_SH_SWITCH16
2292 ENUMX
2293   BFD_RELOC_SH_SWITCH32
2294 ENUMX
2295   BFD_RELOC_SH_USES
2296 ENUMX
2297   BFD_RELOC_SH_COUNT
2298 ENUMX
2299   BFD_RELOC_SH_ALIGN
2300 ENUMX
2301   BFD_RELOC_SH_CODE
2302 ENUMX
2303   BFD_RELOC_SH_DATA
2304 ENUMX
2305   BFD_RELOC_SH_LABEL
2306 ENUMX
2307   BFD_RELOC_SH_LOOP_START
2308 ENUMX
2309   BFD_RELOC_SH_LOOP_END
2310 ENUMX
2311   BFD_RELOC_SH_COPY
2312 ENUMX
2313   BFD_RELOC_SH_GLOB_DAT
2314 ENUMX
2315   BFD_RELOC_SH_JMP_SLOT
2316 ENUMX
2317   BFD_RELOC_SH_RELATIVE
2318 ENUMX
2319   BFD_RELOC_SH_GOTPC
2320 ENUMDOC
2321   Hitachi SH relocs.  Not all of these appear in object files.
2322
2323 ENUM
2324   BFD_RELOC_THUMB_PCREL_BRANCH9
2325 ENUMX
2326   BFD_RELOC_THUMB_PCREL_BRANCH12
2327 ENUMX
2328   BFD_RELOC_THUMB_PCREL_BRANCH23
2329 ENUMDOC
2330   Thumb 23-, 12- and 9-bit pc-relative branches.  The lowest bit must
2331   be zero and is not stored in the instruction.
2332
2333 ENUM
2334   BFD_RELOC_ARC_B22_PCREL
2335 ENUMDOC
2336   Argonaut RISC Core (ARC) relocs.
2337   ARC 22 bit pc-relative branch.  The lowest two bits must be zero and are
2338   not stored in the instruction.  The high 20 bits are installed in bits 26
2339   through 7 of the instruction.
2340 ENUM
2341   BFD_RELOC_ARC_B26
2342 ENUMDOC
2343   ARC 26 bit absolute branch.  The lowest two bits must be zero and are not
2344   stored in the instruction.  The high 24 bits are installed in bits 23
2345   through 0.
2346
2347 ENUM
2348   BFD_RELOC_D10V_10_PCREL_R
2349 ENUMDOC
2350   Mitsubishi D10V relocs.
2351   This is a 10-bit reloc with the right 2 bits
2352   assumed to be 0.
2353 ENUM
2354   BFD_RELOC_D10V_10_PCREL_L
2355 ENUMDOC
2356   Mitsubishi D10V relocs.
2357   This is a 10-bit reloc with the right 2 bits
2358   assumed to be 0.  This is the same as the previous reloc
2359   except it is in the left container, i.e.,
2360   shifted left 15 bits.
2361 ENUM
2362   BFD_RELOC_D10V_18
2363 ENUMDOC
2364   This is an 18-bit reloc with the right 2 bits
2365   assumed to be 0.
2366 ENUM
2367   BFD_RELOC_D10V_18_PCREL
2368 ENUMDOC
2369   This is an 18-bit reloc with the right 2 bits
2370   assumed to be 0.
2371
2372 ENUM
2373   BFD_RELOC_D30V_6
2374 ENUMDOC
2375   Mitsubishi D30V relocs.
2376   This is a 6-bit absolute reloc.
2377 ENUM
2378   BFD_RELOC_D30V_9_PCREL
2379 ENUMDOC
2380   This is a 6-bit pc-relative reloc with
2381   the right 3 bits assumed to be 0.
2382 ENUM
2383   BFD_RELOC_D30V_9_PCREL_R
2384 ENUMDOC
2385   This is a 6-bit pc-relative reloc with
2386   the right 3 bits assumed to be 0. Same
2387   as the previous reloc but on the right side
2388   of the container.
2389 ENUM
2390   BFD_RELOC_D30V_15
2391 ENUMDOC
2392   This is a 12-bit absolute reloc with the
2393   right 3 bitsassumed to be 0.
2394 ENUM
2395   BFD_RELOC_D30V_15_PCREL
2396 ENUMDOC
2397   This is a 12-bit pc-relative reloc with
2398   the right 3 bits assumed to be 0.
2399 ENUM
2400   BFD_RELOC_D30V_15_PCREL_R
2401 ENUMDOC
2402   This is a 12-bit pc-relative reloc with
2403   the right 3 bits assumed to be 0. Same
2404   as the previous reloc but on the right side
2405   of the container.
2406 ENUM
2407   BFD_RELOC_D30V_21
2408 ENUMDOC
2409   This is an 18-bit absolute reloc with
2410   the right 3 bits assumed to be 0.
2411 ENUM
2412   BFD_RELOC_D30V_21_PCREL
2413 ENUMDOC
2414   This is an 18-bit pc-relative reloc with
2415   the right 3 bits assumed to be 0.
2416 ENUM
2417   BFD_RELOC_D30V_21_PCREL_R
2418 ENUMDOC
2419   This is an 18-bit pc-relative reloc with
2420   the right 3 bits assumed to be 0. Same
2421   as the previous reloc but on the right side
2422   of the container.
2423 ENUM
2424   BFD_RELOC_D30V_32
2425 ENUMDOC
2426   This is a 32-bit absolute reloc.
2427 ENUM
2428   BFD_RELOC_D30V_32_PCREL
2429 ENUMDOC
2430   This is a 32-bit pc-relative reloc.
2431
2432 ENUM
2433   BFD_RELOC_M32R_24
2434 ENUMDOC
2435   Mitsubishi M32R relocs.
2436   This is a 24 bit absolute address.
2437 ENUM
2438   BFD_RELOC_M32R_10_PCREL
2439 ENUMDOC
2440   This is a 10-bit pc-relative reloc with the right 2 bits assumed to be 0.
2441 ENUM
2442   BFD_RELOC_M32R_18_PCREL
2443 ENUMDOC
2444   This is an 18-bit reloc with the right 2 bits assumed to be 0.
2445 ENUM
2446   BFD_RELOC_M32R_26_PCREL
2447 ENUMDOC
2448   This is a 26-bit reloc with the right 2 bits assumed to be 0.
2449 ENUM
2450   BFD_RELOC_M32R_HI16_ULO
2451 ENUMDOC
2452   This is a 16-bit reloc containing the high 16 bits of an address
2453   used when the lower 16 bits are treated as unsigned.
2454 ENUM
2455   BFD_RELOC_M32R_HI16_SLO
2456 ENUMDOC
2457   This is a 16-bit reloc containing the high 16 bits of an address
2458   used when the lower 16 bits are treated as signed.
2459 ENUM
2460   BFD_RELOC_M32R_LO16
2461 ENUMDOC
2462   This is a 16-bit reloc containing the lower 16 bits of an address.
2463 ENUM
2464   BFD_RELOC_M32R_SDA16
2465 ENUMDOC
2466   This is a 16-bit reloc containing the small data area offset for use in
2467   add3, load, and store instructions.
2468
2469 ENUM
2470   BFD_RELOC_V850_9_PCREL
2471 ENUMDOC
2472   This is a 9-bit reloc
2473 ENUM
2474   BFD_RELOC_V850_22_PCREL
2475 ENUMDOC
2476   This is a 22-bit reloc
2477
2478 ENUM
2479   BFD_RELOC_V850_SDA_16_16_OFFSET
2480 ENUMDOC
2481   This is a 16 bit offset from the short data area pointer.
2482 ENUM
2483   BFD_RELOC_V850_SDA_15_16_OFFSET
2484 ENUMDOC
2485   This is a 16 bit offset (of which only 15 bits are used) from the
2486   short data area pointer.
2487 ENUM
2488   BFD_RELOC_V850_ZDA_16_16_OFFSET
2489 ENUMDOC
2490   This is a 16 bit offset from the zero data area pointer.
2491 ENUM
2492   BFD_RELOC_V850_ZDA_15_16_OFFSET
2493 ENUMDOC
2494   This is a 16 bit offset (of which only 15 bits are used) from the
2495   zero data area pointer.
2496 ENUM
2497   BFD_RELOC_V850_TDA_6_8_OFFSET
2498 ENUMDOC
2499   This is an 8 bit offset (of which only 6 bits are used) from the
2500   tiny data area pointer.
2501 ENUM
2502   BFD_RELOC_V850_TDA_7_8_OFFSET
2503 ENUMDOC
2504   This is an 8bit offset (of which only 7 bits are used) from the tiny
2505   data area pointer.
2506 ENUM
2507   BFD_RELOC_V850_TDA_7_7_OFFSET
2508 ENUMDOC
2509   This is a 7 bit offset from the tiny data area pointer.
2510 ENUM
2511   BFD_RELOC_V850_TDA_16_16_OFFSET
2512 ENUMDOC
2513   This is a 16 bit offset from the tiny data area pointer.
2514 COMMENT
2515 ENUM
2516   BFD_RELOC_V850_TDA_4_5_OFFSET
2517 ENUMDOC
2518   This is a 5 bit offset (of which only 4 bits are used) from the tiny
2519   data area pointer.
2520 ENUM
2521   BFD_RELOC_V850_TDA_4_4_OFFSET
2522 ENUMDOC
2523   This is a 4 bit offset from the tiny data area pointer.
2524 ENUM
2525   BFD_RELOC_V850_SDA_16_16_SPLIT_OFFSET
2526 ENUMDOC
2527   This is a 16 bit offset from the short data area pointer, with the
2528   bits placed non-contigously in the instruction.
2529 ENUM
2530   BFD_RELOC_V850_ZDA_16_16_SPLIT_OFFSET
2531 ENUMDOC
2532   This is a 16 bit offset from the zero data area pointer, with the
2533   bits placed non-contigously in the instruction.
2534 ENUM
2535   BFD_RELOC_V850_CALLT_6_7_OFFSET
2536 ENUMDOC
2537   This is a 6 bit offset from the call table base pointer.
2538 ENUM
2539   BFD_RELOC_V850_CALLT_16_16_OFFSET
2540 ENUMDOC
2541   This is a 16 bit offset from the call table base pointer.
2542 COMMENT
2543
2544 ENUM
2545   BFD_RELOC_MN10300_32_PCREL
2546 ENUMDOC
2547   This is a 32bit pcrel reloc for the mn10300, offset by two bytes in the
2548   instruction.
2549 ENUM
2550   BFD_RELOC_MN10300_16_PCREL
2551 ENUMDOC
2552   This is a 16bit pcrel reloc for the mn10300, offset by two bytes in the
2553   instruction.
2554
2555 ENUM
2556   BFD_RELOC_TIC30_LDP
2557 ENUMDOC
2558   This is a 8bit DP reloc for the tms320c30, where the most
2559   significant 8 bits of a 24 bit word are placed into the least
2560   significant 8 bits of the opcode.
2561
2562 ENUM
2563   BFD_RELOC_TIC54X_PARTLS7
2564 ENUMDOC
2565   This is a 7bit reloc for the tms320c54x, where the least
2566   significant 7 bits of a 16 bit word are placed into the least
2567   significant 7 bits of the opcode.
2568
2569 ENUM
2570   BFD_RELOC_TIC54X_PARTMS9
2571 ENUMDOC
2572   This is a 9bit DP reloc for the tms320c54x, where the most
2573   significant 9 bits of a 16 bit word are placed into the least
2574   significant 9 bits of the opcode.
2575
2576 ENUM
2577   BFD_RELOC_TIC54X_23
2578 ENUMDOC
2579   This is an extended address 23-bit reloc for the tms320c54x.
2580
2581 ENUM
2582   BFD_RELOC_TIC54X_16_OF_23
2583 ENUMDOC
2584   This is a 16-bit reloc for the tms320c54x, where the least
2585   significant 16 bits of a 23-bit extended address are placed into
2586   the opcode.
2587
2588 ENUM
2589   BFD_RELOC_TIC54X_MS7_OF_23
2590 ENUMDOC
2591   This is a reloc for the tms320c54x, where the most
2592   significant 7 bits of a 23-bit extended address are placed into
2593   the opcode.
2594
2595 ENUM
2596   BFD_RELOC_FR30_48
2597 ENUMDOC
2598   This is a 48 bit reloc for the FR30 that stores 32 bits.
2599 ENUM
2600   BFD_RELOC_FR30_20
2601 ENUMDOC
2602   This is a 32 bit reloc for the FR30 that stores 20 bits split up into
2603   two sections.
2604 ENUM
2605   BFD_RELOC_FR30_6_IN_4
2606 ENUMDOC
2607   This is a 16 bit reloc for the FR30 that stores a 6 bit word offset in
2608   4 bits.
2609 ENUM
2610   BFD_RELOC_FR30_8_IN_8
2611 ENUMDOC
2612   This is a 16 bit reloc for the FR30 that stores an 8 bit byte offset
2613   into 8 bits.
2614 ENUM
2615   BFD_RELOC_FR30_9_IN_8
2616 ENUMDOC
2617   This is a 16 bit reloc for the FR30 that stores a 9 bit short offset
2618   into 8 bits.
2619 ENUM
2620   BFD_RELOC_FR30_10_IN_8
2621 ENUMDOC
2622   This is a 16 bit reloc for the FR30 that stores a 10 bit word offset
2623   into 8 bits.
2624 ENUM
2625   BFD_RELOC_FR30_9_PCREL
2626 ENUMDOC
2627   This is a 16 bit reloc for the FR30 that stores a 9 bit pc relative
2628   short offset into 8 bits.
2629 ENUM
2630   BFD_RELOC_FR30_12_PCREL
2631 ENUMDOC
2632   This is a 16 bit reloc for the FR30 that stores a 12 bit pc relative
2633   short offset into 11 bits.
2634
2635 ENUM
2636   BFD_RELOC_MCORE_PCREL_IMM8BY4
2637 ENUMX
2638   BFD_RELOC_MCORE_PCREL_IMM11BY2
2639 ENUMX
2640   BFD_RELOC_MCORE_PCREL_IMM4BY2
2641 ENUMX
2642   BFD_RELOC_MCORE_PCREL_32
2643 ENUMX
2644   BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2
2645 ENUMX
2646   BFD_RELOC_MCORE_RVA
2647 ENUMDOC
2648   Motorola Mcore relocations.
2649
2650 ENUM
2651   BFD_RELOC_AVR_7_PCREL
2652 ENUMDOC
2653   This is a 16 bit reloc for the AVR that stores 8 bit pc relative
2654   short offset into 7 bits.
2655 ENUM
2656   BFD_RELOC_AVR_13_PCREL
2657 ENUMDOC
2658   This is a 16 bit reloc for the AVR that stores 13 bit pc relative
2659   short offset into 12 bits.
2660 ENUM
2661   BFD_RELOC_AVR_16_PM
2662 ENUMDOC
2663   This is a 16 bit reloc for the AVR that stores 17 bit value (usually
2664   program memory address) into 16 bits.
2665 ENUM
2666   BFD_RELOC_AVR_LO8_LDI
2667 ENUMDOC
2668   This is a 16 bit reloc for the AVR that stores 8 bit value (usually
2669   data memory address) into 8 bit immediate value of LDI insn.
2670 ENUM
2671   BFD_RELOC_AVR_HI8_LDI
2672 ENUMDOC
2673   This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit
2674   of data memory address) into 8 bit immediate value of LDI insn.
2675 ENUM
2676   BFD_RELOC_AVR_HH8_LDI
2677 ENUMDOC
2678   This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit
2679   of program memory address) into 8 bit immediate value of LDI insn.
2680 ENUM
2681   BFD_RELOC_AVR_LO8_LDI_NEG
2682 ENUMDOC
2683   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2684   (usually data memory address) into 8 bit immediate value of SUBI insn.
2685 ENUM
2686   BFD_RELOC_AVR_HI8_LDI_NEG
2687 ENUMDOC
2688   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2689   (high 8 bit of data memory address) into 8 bit immediate value of
2690   SUBI insn.
2691 ENUM
2692   BFD_RELOC_AVR_HH8_LDI_NEG
2693 ENUMDOC
2694   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2695   (most high 8 bit of program memory address) into 8 bit immediate value
2696   of LDI or SUBI insn.
2697 ENUM
2698   BFD_RELOC_AVR_LO8_LDI_PM
2699 ENUMDOC
2700   This is a 16 bit reloc for the AVR that stores 8 bit value (usually
2701   command address) into 8 bit immediate value of LDI insn.
2702 ENUM
2703   BFD_RELOC_AVR_HI8_LDI_PM
2704 ENUMDOC
2705   This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit
2706   of command address) into 8 bit immediate value of LDI insn.
2707 ENUM
2708   BFD_RELOC_AVR_HH8_LDI_PM
2709 ENUMDOC
2710   This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit
2711   of command address) into 8 bit immediate value of LDI insn.
2712 ENUM
2713   BFD_RELOC_AVR_LO8_LDI_PM_NEG
2714 ENUMDOC
2715   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2716   (usually command address) into 8 bit immediate value of SUBI insn.
2717 ENUM
2718   BFD_RELOC_AVR_HI8_LDI_PM_NEG
2719 ENUMDOC
2720   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2721   (high 8 bit of 16 bit command address) into 8 bit immediate value
2722   of SUBI insn.
2723 ENUM
2724   BFD_RELOC_AVR_HH8_LDI_PM_NEG
2725 ENUMDOC
2726   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2727   (high 6 bit of 22 bit command address) into 8 bit immediate
2728   value of SUBI insn.
2729 ENUM
2730   BFD_RELOC_AVR_CALL
2731 ENUMDOC
2732   This is a 32 bit reloc for the AVR that stores 23 bit value
2733   into 22 bits.
2734
2735 ENUM
2736   BFD_RELOC_VTABLE_INHERIT
2737 ENUMX
2738   BFD_RELOC_VTABLE_ENTRY
2739 ENUMDOC
2740   These two relocations are used by the linker to determine which of
2741   the entries in a C++ virtual function table are actually used.  When
2742   the --gc-sections option is given, the linker will zero out the entries
2743   that are not used, so that the code for those functions need not be
2744   included in the output.
2745
2746   VTABLE_INHERIT is a zero-space relocation used to describe to the
2747   linker the inheritence tree of a C++ virtual function table.  The
2748   relocation's symbol should be the parent class' vtable, and the
2749   relocation should be located at the child vtable.
2750
2751   VTABLE_ENTRY is a zero-space relocation that describes the use of a
2752   virtual function table entry.  The reloc's symbol should refer to the
2753   table of the class mentioned in the code.  Off of that base, an offset
2754   describes the entry that is being used.  For Rela hosts, this offset
2755   is stored in the reloc's addend.  For Rel hosts, we are forced to put
2756   this offset in the reloc's section offset.
2757
2758 ENUM
2759   BFD_RELOC_IA64_IMM14
2760 ENUMX
2761   BFD_RELOC_IA64_IMM22
2762 ENUMX
2763   BFD_RELOC_IA64_IMM64
2764 ENUMX
2765   BFD_RELOC_IA64_DIR32MSB
2766 ENUMX
2767   BFD_RELOC_IA64_DIR32LSB
2768 ENUMX
2769   BFD_RELOC_IA64_DIR64MSB
2770 ENUMX
2771   BFD_RELOC_IA64_DIR64LSB
2772 ENUMX
2773   BFD_RELOC_IA64_GPREL22
2774 ENUMX
2775   BFD_RELOC_IA64_GPREL64I
2776 ENUMX
2777   BFD_RELOC_IA64_GPREL32MSB
2778 ENUMX
2779   BFD_RELOC_IA64_GPREL32LSB
2780 ENUMX
2781   BFD_RELOC_IA64_GPREL64MSB
2782 ENUMX
2783   BFD_RELOC_IA64_GPREL64LSB
2784 ENUMX
2785   BFD_RELOC_IA64_LTOFF22
2786 ENUMX
2787   BFD_RELOC_IA64_LTOFF64I
2788 ENUMX
2789   BFD_RELOC_IA64_PLTOFF22
2790 ENUMX
2791   BFD_RELOC_IA64_PLTOFF64I
2792 ENUMX
2793   BFD_RELOC_IA64_PLTOFF64MSB
2794 ENUMX
2795   BFD_RELOC_IA64_PLTOFF64LSB
2796 ENUMX
2797   BFD_RELOC_IA64_FPTR64I
2798 ENUMX
2799   BFD_RELOC_IA64_FPTR32MSB
2800 ENUMX
2801   BFD_RELOC_IA64_FPTR32LSB
2802 ENUMX
2803   BFD_RELOC_IA64_FPTR64MSB
2804 ENUMX
2805   BFD_RELOC_IA64_FPTR64LSB
2806 ENUMX
2807   BFD_RELOC_IA64_PCREL21B
2808 ENUMX
2809   BFD_RELOC_IA64_PCREL21BI
2810 ENUMX
2811   BFD_RELOC_IA64_PCREL21M
2812 ENUMX
2813   BFD_RELOC_IA64_PCREL21F
2814 ENUMX
2815   BFD_RELOC_IA64_PCREL22
2816 ENUMX
2817   BFD_RELOC_IA64_PCREL60B
2818 ENUMX
2819   BFD_RELOC_IA64_PCREL64I
2820 ENUMX
2821   BFD_RELOC_IA64_PCREL32MSB
2822 ENUMX
2823   BFD_RELOC_IA64_PCREL32LSB
2824 ENUMX
2825   BFD_RELOC_IA64_PCREL64MSB
2826 ENUMX
2827   BFD_RELOC_IA64_PCREL64LSB
2828 ENUMX
2829   BFD_RELOC_IA64_LTOFF_FPTR22
2830 ENUMX
2831   BFD_RELOC_IA64_LTOFF_FPTR64I
2832 ENUMX
2833   BFD_RELOC_IA64_LTOFF_FPTR64MSB
2834 ENUMX
2835   BFD_RELOC_IA64_LTOFF_FPTR64LSB
2836 ENUMX
2837   BFD_RELOC_IA64_SEGBASE
2838 ENUMX
2839   BFD_RELOC_IA64_SEGREL32MSB
2840 ENUMX
2841   BFD_RELOC_IA64_SEGREL32LSB
2842 ENUMX
2843   BFD_RELOC_IA64_SEGREL64MSB
2844 ENUMX
2845   BFD_RELOC_IA64_SEGREL64LSB
2846 ENUMX
2847   BFD_RELOC_IA64_SECREL32MSB
2848 ENUMX
2849   BFD_RELOC_IA64_SECREL32LSB
2850 ENUMX
2851   BFD_RELOC_IA64_SECREL64MSB
2852 ENUMX
2853   BFD_RELOC_IA64_SECREL64LSB
2854 ENUMX
2855   BFD_RELOC_IA64_REL32MSB
2856 ENUMX
2857   BFD_RELOC_IA64_REL32LSB
2858 ENUMX
2859   BFD_RELOC_IA64_REL64MSB
2860 ENUMX
2861   BFD_RELOC_IA64_REL64LSB
2862 ENUMX
2863   BFD_RELOC_IA64_LTV32MSB
2864 ENUMX
2865   BFD_RELOC_IA64_LTV32LSB
2866 ENUMX
2867   BFD_RELOC_IA64_LTV64MSB
2868 ENUMX
2869   BFD_RELOC_IA64_LTV64LSB
2870 ENUMX
2871   BFD_RELOC_IA64_IPLTMSB
2872 ENUMX
2873   BFD_RELOC_IA64_IPLTLSB
2874 ENUMX
2875   BFD_RELOC_IA64_EPLTMSB
2876 ENUMX
2877   BFD_RELOC_IA64_EPLTLSB
2878 ENUMX
2879   BFD_RELOC_IA64_COPY
2880 ENUMX
2881   BFD_RELOC_IA64_TPREL22
2882 ENUMX
2883   BFD_RELOC_IA64_TPREL64MSB
2884 ENUMX
2885   BFD_RELOC_IA64_TPREL64LSB
2886 ENUMX
2887   BFD_RELOC_IA64_LTOFF_TP22
2888 ENUMX
2889   BFD_RELOC_IA64_LTOFF22X
2890 ENUMX
2891   BFD_RELOC_IA64_LDXMOV
2892 ENUMDOC
2893   Intel IA64 Relocations.
2894
2895 ENUM
2896   BFD_RELOC_M68HC11_HI8
2897 ENUMDOC
2898   Motorola 68HC11 reloc.
2899   This is the 8 bits high part of an absolute address.
2900 ENUM
2901   BFD_RELOC_M68HC11_LO8
2902 ENUMDOC
2903   Motorola 68HC11 reloc.
2904   This is the 8 bits low part of an absolute address.
2905 ENUM
2906   BFD_RELOC_M68HC11_3B
2907 ENUMDOC
2908   Motorola 68HC11 reloc.
2909   This is the 3 bits of a value.
2910
2911 ENUM
2912   BFD_RELOC_CRIS_BDISP8
2913 ENUMX
2914   BFD_RELOC_CRIS_UNSIGNED_5
2915 ENUMX
2916   BFD_RELOC_CRIS_SIGNED_6
2917 ENUMX
2918   BFD_RELOC_CRIS_UNSIGNED_6
2919 ENUMX
2920   BFD_RELOC_CRIS_UNSIGNED_4
2921 ENUMDOC
2922   These relocs are only used within the CRIS assembler.  They are not
2923   (at present) written to any object files.
2924
2925 ENUM
2926   BFD_RELOC_860_COPY
2927 ENUMX
2928   BFD_RELOC_860_GLOB_DAT
2929 ENUMX
2930   BFD_RELOC_860_JUMP_SLOT
2931 ENUMX
2932   BFD_RELOC_860_RELATIVE
2933 ENUMX
2934   BFD_RELOC_860_PC26
2935 ENUMX
2936   BFD_RELOC_860_PLT26
2937 ENUMX
2938   BFD_RELOC_860_PC16
2939 ENUMX
2940   BFD_RELOC_860_LOW0
2941 ENUMX
2942   BFD_RELOC_860_SPLIT0
2943 ENUMX
2944   BFD_RELOC_860_LOW1
2945 ENUMX
2946   BFD_RELOC_860_SPLIT1
2947 ENUMX
2948   BFD_RELOC_860_LOW2
2949 ENUMX
2950   BFD_RELOC_860_SPLIT2
2951 ENUMX
2952   BFD_RELOC_860_LOW3
2953 ENUMX
2954   BFD_RELOC_860_LOGOT0
2955 ENUMX
2956   BFD_RELOC_860_SPGOT0
2957 ENUMX
2958   BFD_RELOC_860_LOGOT1
2959 ENUMX
2960   BFD_RELOC_860_SPGOT1
2961 ENUMX
2962   BFD_RELOC_860_LOGOTOFF0
2963 ENUMX
2964   BFD_RELOC_860_SPGOTOFF0
2965 ENUMX
2966   BFD_RELOC_860_LOGOTOFF1
2967 ENUMX
2968   BFD_RELOC_860_SPGOTOFF1
2969 ENUMX
2970   BFD_RELOC_860_LOGOTOFF2
2971 ENUMX
2972   BFD_RELOC_860_LOGOTOFF3
2973 ENUMX
2974   BFD_RELOC_860_LOPC
2975 ENUMX
2976   BFD_RELOC_860_HIGHADJ
2977 ENUMX
2978   BFD_RELOC_860_HAGOT
2979 ENUMX
2980   BFD_RELOC_860_HAGOTOFF
2981 ENUMX
2982   BFD_RELOC_860_HAPC
2983 ENUMX
2984   BFD_RELOC_860_HIGH
2985 ENUMX
2986   BFD_RELOC_860_HIGOT
2987 ENUMX
2988   BFD_RELOC_860_HIGOTOFF
2989 ENUMDOC
2990   Intel i860 Relocations.
2991
2992 ENDSENUM
2993   BFD_RELOC_UNUSED
2994 CODE_FRAGMENT
2995 .
2996 .typedef enum bfd_reloc_code_real bfd_reloc_code_real_type;
2997 */
2998
2999
3000 /*
3001 FUNCTION
3002         bfd_reloc_type_lookup
3003
3004 SYNOPSIS
3005         reloc_howto_type *
3006         bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code);
3007
3008 DESCRIPTION
3009         Return a pointer to a howto structure which, when
3010         invoked, will perform the relocation @var{code} on data from the
3011         architecture noted.
3012
3013 */
3014
3015
3016 reloc_howto_type *
3017 bfd_reloc_type_lookup (abfd, code)
3018      bfd *abfd;
3019      bfd_reloc_code_real_type code;
3020 {
3021   return BFD_SEND (abfd, reloc_type_lookup, (abfd, code));
3022 }
3023
3024 static reloc_howto_type bfd_howto_32 =
3025 HOWTO (0, 00, 2, 32, false, 0, complain_overflow_bitfield, 0, "VRT32", false, 0xffffffff, 0xffffffff, true);
3026
3027
3028 /*
3029 INTERNAL_FUNCTION
3030         bfd_default_reloc_type_lookup
3031
3032 SYNOPSIS
3033         reloc_howto_type *bfd_default_reloc_type_lookup
3034         (bfd *abfd, bfd_reloc_code_real_type  code);
3035
3036 DESCRIPTION
3037         Provides a default relocation lookup routine for any architecture.
3038
3039
3040 */
3041
3042 reloc_howto_type *
3043 bfd_default_reloc_type_lookup (abfd, code)
3044      bfd *abfd;
3045      bfd_reloc_code_real_type code;
3046 {
3047   switch (code)
3048     {
3049     case BFD_RELOC_CTOR:
3050       /* The type of reloc used in a ctor, which will be as wide as the
3051          address - so either a 64, 32, or 16 bitter.  */
3052       switch (bfd_get_arch_info (abfd)->bits_per_address)
3053         {
3054         case 64:
3055           BFD_FAIL ();
3056         case 32:
3057           return &bfd_howto_32;
3058         case 16:
3059           BFD_FAIL ();
3060         default:
3061           BFD_FAIL ();
3062         }
3063     default:
3064       BFD_FAIL ();
3065     }
3066   return (reloc_howto_type *) NULL;
3067 }
3068
3069 /*
3070 FUNCTION
3071         bfd_get_reloc_code_name
3072
3073 SYNOPSIS
3074         const char *bfd_get_reloc_code_name (bfd_reloc_code_real_type code);
3075
3076 DESCRIPTION
3077         Provides a printable name for the supplied relocation code.
3078         Useful mainly for printing error messages.
3079 */
3080
3081 const char *
3082 bfd_get_reloc_code_name (code)
3083      bfd_reloc_code_real_type code;
3084 {
3085   if (code > BFD_RELOC_UNUSED)
3086     return 0;
3087   return bfd_reloc_code_real_names[(int)code];
3088 }
3089
3090 /*
3091 INTERNAL_FUNCTION
3092         bfd_generic_relax_section
3093
3094 SYNOPSIS
3095         boolean bfd_generic_relax_section
3096          (bfd *abfd,
3097           asection *section,
3098           struct bfd_link_info *,
3099           boolean *);
3100
3101 DESCRIPTION
3102         Provides default handling for relaxing for back ends which
3103         don't do relaxing -- i.e., does nothing.
3104 */
3105
3106 /*ARGSUSED*/
3107 boolean
3108 bfd_generic_relax_section (abfd, section, link_info, again)
3109      bfd *abfd ATTRIBUTE_UNUSED;
3110      asection *section ATTRIBUTE_UNUSED;
3111      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3112      boolean *again;
3113 {
3114   *again = false;
3115   return true;
3116 }
3117
3118 /*
3119 INTERNAL_FUNCTION
3120         bfd_generic_gc_sections
3121
3122 SYNOPSIS
3123         boolean bfd_generic_gc_sections
3124          (bfd *, struct bfd_link_info *);
3125
3126 DESCRIPTION
3127         Provides default handling for relaxing for back ends which
3128         don't do section gc -- i.e., does nothing.
3129 */
3130
3131 /*ARGSUSED*/
3132 boolean
3133 bfd_generic_gc_sections (abfd, link_info)
3134      bfd *abfd ATTRIBUTE_UNUSED;
3135      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3136 {
3137   return true;
3138 }
3139
3140 /*
3141 INTERNAL_FUNCTION
3142         bfd_generic_get_relocated_section_contents
3143
3144 SYNOPSIS
3145         bfd_byte *
3146            bfd_generic_get_relocated_section_contents (bfd *abfd,
3147              struct bfd_link_info *link_info,
3148              struct bfd_link_order *link_order,
3149              bfd_byte *data,
3150              boolean relocateable,
3151              asymbol **symbols);
3152
3153 DESCRIPTION
3154         Provides default handling of relocation effort for back ends
3155         which can't be bothered to do it efficiently.
3156
3157 */
3158
3159 bfd_byte *
3160 bfd_generic_get_relocated_section_contents (abfd, link_info, link_order, data,
3161                                             relocateable, symbols)
3162      bfd *abfd;
3163      struct bfd_link_info *link_info;
3164      struct bfd_link_order *link_order;
3165      bfd_byte *data;
3166      boolean relocateable;
3167      asymbol **symbols;
3168 {
3169   /* Get enough memory to hold the stuff */
3170   bfd *input_bfd = link_order->u.indirect.section->owner;
3171   asection *input_section = link_order->u.indirect.section;
3172
3173   long reloc_size = bfd_get_reloc_upper_bound (input_bfd, input_section);
3174   arelent **reloc_vector = NULL;
3175   long reloc_count;
3176
3177   if (reloc_size < 0)
3178     goto error_return;
3179
3180   reloc_vector = (arelent **) bfd_malloc ((size_t) reloc_size);
3181   if (reloc_vector == NULL && reloc_size != 0)
3182     goto error_return;
3183
3184   /* read in the section */
3185   if (!bfd_get_section_contents (input_bfd,
3186                                  input_section,
3187                                  (PTR) data,
3188                                  0,
3189                                  input_section->_raw_size))
3190     goto error_return;
3191
3192   /* We're not relaxing the section, so just copy the size info */
3193   input_section->_cooked_size = input_section->_raw_size;
3194   input_section->reloc_done = true;
3195
3196   reloc_count = bfd_canonicalize_reloc (input_bfd,
3197                                         input_section,
3198                                         reloc_vector,
3199                                         symbols);
3200   if (reloc_count < 0)
3201     goto error_return;
3202
3203   if (reloc_count > 0)
3204     {
3205       arelent **parent;
3206       for (parent = reloc_vector; *parent != (arelent *) NULL;
3207            parent++)
3208         {
3209           char *error_message = (char *) NULL;
3210           bfd_reloc_status_type r =
3211             bfd_perform_relocation (input_bfd,
3212                                     *parent,
3213                                     (PTR) data,
3214                                     input_section,
3215                                     relocateable ? abfd : (bfd *) NULL,
3216                                     &error_message);
3217
3218           if (relocateable)
3219             {
3220               asection *os = input_section->output_section;
3221
3222               /* A partial link, so keep the relocs */
3223               os->orelocation[os->reloc_count] = *parent;
3224               os->reloc_count++;
3225             }
3226
3227           if (r != bfd_reloc_ok)
3228             {
3229               switch (r)
3230                 {
3231                 case bfd_reloc_undefined:
3232                   if (!((*link_info->callbacks->undefined_symbol)
3233                         (link_info, bfd_asymbol_name (*(*parent)->sym_ptr_ptr),
3234                          input_bfd, input_section, (*parent)->address,
3235                          true)))
3236                     goto error_return;
3237                   break;
3238                 case bfd_reloc_dangerous:
3239                   BFD_ASSERT (error_message != (char *) NULL);
3240                   if (!((*link_info->callbacks->reloc_dangerous)
3241                         (link_info, error_message, input_bfd, input_section,
3242                          (*parent)->address)))
3243                     goto error_return;
3244                   break;
3245                 case bfd_reloc_overflow:
3246                   if (!((*link_info->callbacks->reloc_overflow)
3247                         (link_info, bfd_asymbol_name (*(*parent)->sym_ptr_ptr),
3248                          (*parent)->howto->name, (*parent)->addend,
3249                          input_bfd, input_section, (*parent)->address)))
3250                     goto error_return;
3251                   break;
3252                 case bfd_reloc_outofrange:
3253                 default:
3254                   abort ();
3255                   break;
3256                 }
3257
3258             }
3259         }
3260     }
3261   if (reloc_vector != NULL)
3262     free (reloc_vector);
3263   return data;
3264
3265 error_return:
3266   if (reloc_vector != NULL)
3267     free (reloc_vector);
3268   return NULL;
3269 }