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_X86_64_GOT32
2082 ENUMX
2083   BFD_RELOC_X86_64_PLT32
2084 ENUMX
2085   BFD_RELOC_X86_64_COPY
2086 ENUMX
2087   BFD_RELOC_X86_64_GLOB_DAT
2088 ENUMX
2089   BFD_RELOC_X86_64_JUMP_SLOT
2090 ENUMX
2091   BFD_RELOC_X86_64_RELATIVE
2092 ENUMX
2093   BFD_RELOC_X86_64_GOTPCREL
2094 ENUMX
2095   BFD_RELOC_X86_64_32S
2096 ENUMDOC
2097   x86-64/elf relocations
2098
2099 ENUM
2100   BFD_RELOC_NS32K_IMM_8
2101 ENUMX
2102   BFD_RELOC_NS32K_IMM_16
2103 ENUMX
2104   BFD_RELOC_NS32K_IMM_32
2105 ENUMX
2106   BFD_RELOC_NS32K_IMM_8_PCREL
2107 ENUMX
2108   BFD_RELOC_NS32K_IMM_16_PCREL
2109 ENUMX
2110   BFD_RELOC_NS32K_IMM_32_PCREL
2111 ENUMX
2112   BFD_RELOC_NS32K_DISP_8
2113 ENUMX
2114   BFD_RELOC_NS32K_DISP_16
2115 ENUMX
2116   BFD_RELOC_NS32K_DISP_32
2117 ENUMX
2118   BFD_RELOC_NS32K_DISP_8_PCREL
2119 ENUMX
2120   BFD_RELOC_NS32K_DISP_16_PCREL
2121 ENUMX
2122   BFD_RELOC_NS32K_DISP_32_PCREL
2123 ENUMDOC
2124   ns32k relocations
2125
2126 ENUM
2127   BFD_RELOC_PJ_CODE_HI16
2128 ENUMX
2129   BFD_RELOC_PJ_CODE_LO16
2130 ENUMX
2131   BFD_RELOC_PJ_CODE_DIR16
2132 ENUMX
2133   BFD_RELOC_PJ_CODE_DIR32
2134 ENUMX
2135   BFD_RELOC_PJ_CODE_REL16
2136 ENUMX
2137   BFD_RELOC_PJ_CODE_REL32
2138 ENUMDOC
2139   Picojava relocs.  Not all of these appear in object files.
2140
2141 ENUM
2142   BFD_RELOC_PPC_B26
2143 ENUMX
2144   BFD_RELOC_PPC_BA26
2145 ENUMX
2146   BFD_RELOC_PPC_TOC16
2147 ENUMX
2148   BFD_RELOC_PPC_B16
2149 ENUMX
2150   BFD_RELOC_PPC_B16_BRTAKEN
2151 ENUMX
2152   BFD_RELOC_PPC_B16_BRNTAKEN
2153 ENUMX
2154   BFD_RELOC_PPC_BA16
2155 ENUMX
2156   BFD_RELOC_PPC_BA16_BRTAKEN
2157 ENUMX
2158   BFD_RELOC_PPC_BA16_BRNTAKEN
2159 ENUMX
2160   BFD_RELOC_PPC_COPY
2161 ENUMX
2162   BFD_RELOC_PPC_GLOB_DAT
2163 ENUMX
2164   BFD_RELOC_PPC_JMP_SLOT
2165 ENUMX
2166   BFD_RELOC_PPC_RELATIVE
2167 ENUMX
2168   BFD_RELOC_PPC_LOCAL24PC
2169 ENUMX
2170   BFD_RELOC_PPC_EMB_NADDR32
2171 ENUMX
2172   BFD_RELOC_PPC_EMB_NADDR16
2173 ENUMX
2174   BFD_RELOC_PPC_EMB_NADDR16_LO
2175 ENUMX
2176   BFD_RELOC_PPC_EMB_NADDR16_HI
2177 ENUMX
2178   BFD_RELOC_PPC_EMB_NADDR16_HA
2179 ENUMX
2180   BFD_RELOC_PPC_EMB_SDAI16
2181 ENUMX
2182   BFD_RELOC_PPC_EMB_SDA2I16
2183 ENUMX
2184   BFD_RELOC_PPC_EMB_SDA2REL
2185 ENUMX
2186   BFD_RELOC_PPC_EMB_SDA21
2187 ENUMX
2188   BFD_RELOC_PPC_EMB_MRKREF
2189 ENUMX
2190   BFD_RELOC_PPC_EMB_RELSEC16
2191 ENUMX
2192   BFD_RELOC_PPC_EMB_RELST_LO
2193 ENUMX
2194   BFD_RELOC_PPC_EMB_RELST_HI
2195 ENUMX
2196   BFD_RELOC_PPC_EMB_RELST_HA
2197 ENUMX
2198   BFD_RELOC_PPC_EMB_BIT_FLD
2199 ENUMX
2200   BFD_RELOC_PPC_EMB_RELSDA
2201 ENUMDOC
2202   Power(rs6000) and PowerPC relocations.
2203
2204 ENUM
2205   BFD_RELOC_I370_D12
2206 ENUMDOC
2207   IBM 370/390 relocations
2208
2209 ENUM
2210   BFD_RELOC_CTOR
2211 ENUMDOC
2212   The type of reloc used to build a contructor table - at the moment
2213   probably a 32 bit wide absolute relocation, but the target can choose.
2214   It generally does map to one of the other relocation types.
2215
2216 ENUM
2217   BFD_RELOC_ARM_PCREL_BRANCH
2218 ENUMDOC
2219   ARM 26 bit pc-relative branch.  The lowest two bits must be zero and are
2220   not stored in the instruction.
2221 ENUM
2222   BFD_RELOC_ARM_PCREL_BLX
2223 ENUMDOC
2224   ARM 26 bit pc-relative branch.  The lowest bit must be zero and is
2225   not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
2226   field in the instruction.
2227 ENUM
2228   BFD_RELOC_THUMB_PCREL_BLX
2229 ENUMDOC
2230   Thumb 22 bit pc-relative branch.  The lowest bit must be zero and is
2231   not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
2232   field in the instruction.
2233 ENUM
2234   BFD_RELOC_ARM_IMMEDIATE
2235 ENUMX
2236   BFD_RELOC_ARM_ADRL_IMMEDIATE
2237 ENUMX
2238   BFD_RELOC_ARM_OFFSET_IMM
2239 ENUMX
2240   BFD_RELOC_ARM_SHIFT_IMM
2241 ENUMX
2242   BFD_RELOC_ARM_SWI
2243 ENUMX
2244   BFD_RELOC_ARM_MULTI
2245 ENUMX
2246   BFD_RELOC_ARM_CP_OFF_IMM
2247 ENUMX
2248   BFD_RELOC_ARM_ADR_IMM
2249 ENUMX
2250   BFD_RELOC_ARM_LDR_IMM
2251 ENUMX
2252   BFD_RELOC_ARM_LITERAL
2253 ENUMX
2254   BFD_RELOC_ARM_IN_POOL
2255 ENUMX
2256   BFD_RELOC_ARM_OFFSET_IMM8
2257 ENUMX
2258   BFD_RELOC_ARM_HWLITERAL
2259 ENUMX
2260   BFD_RELOC_ARM_THUMB_ADD
2261 ENUMX
2262   BFD_RELOC_ARM_THUMB_IMM
2263 ENUMX
2264   BFD_RELOC_ARM_THUMB_SHIFT
2265 ENUMX
2266   BFD_RELOC_ARM_THUMB_OFFSET
2267 ENUMX
2268   BFD_RELOC_ARM_GOT12
2269 ENUMX
2270   BFD_RELOC_ARM_GOT32
2271 ENUMX
2272   BFD_RELOC_ARM_JUMP_SLOT
2273 ENUMX
2274   BFD_RELOC_ARM_COPY
2275 ENUMX
2276   BFD_RELOC_ARM_GLOB_DAT
2277 ENUMX
2278   BFD_RELOC_ARM_PLT32
2279 ENUMX
2280   BFD_RELOC_ARM_RELATIVE
2281 ENUMX
2282   BFD_RELOC_ARM_GOTOFF
2283 ENUMX
2284   BFD_RELOC_ARM_GOTPC
2285 ENUMDOC
2286   These relocs are only used within the ARM assembler.  They are not
2287   (at present) written to any object files.
2288
2289 ENUM
2290   BFD_RELOC_SH_PCDISP8BY2
2291 ENUMX
2292   BFD_RELOC_SH_PCDISP12BY2
2293 ENUMX
2294   BFD_RELOC_SH_IMM4
2295 ENUMX
2296   BFD_RELOC_SH_IMM4BY2
2297 ENUMX
2298   BFD_RELOC_SH_IMM4BY4
2299 ENUMX
2300   BFD_RELOC_SH_IMM8
2301 ENUMX
2302   BFD_RELOC_SH_IMM8BY2
2303 ENUMX
2304   BFD_RELOC_SH_IMM8BY4
2305 ENUMX
2306   BFD_RELOC_SH_PCRELIMM8BY2
2307 ENUMX
2308   BFD_RELOC_SH_PCRELIMM8BY4
2309 ENUMX
2310   BFD_RELOC_SH_SWITCH16
2311 ENUMX
2312   BFD_RELOC_SH_SWITCH32
2313 ENUMX
2314   BFD_RELOC_SH_USES
2315 ENUMX
2316   BFD_RELOC_SH_COUNT
2317 ENUMX
2318   BFD_RELOC_SH_ALIGN
2319 ENUMX
2320   BFD_RELOC_SH_CODE
2321 ENUMX
2322   BFD_RELOC_SH_DATA
2323 ENUMX
2324   BFD_RELOC_SH_LABEL
2325 ENUMX
2326   BFD_RELOC_SH_LOOP_START
2327 ENUMX
2328   BFD_RELOC_SH_LOOP_END
2329 ENUMX
2330   BFD_RELOC_SH_COPY
2331 ENUMX
2332   BFD_RELOC_SH_GLOB_DAT
2333 ENUMX
2334   BFD_RELOC_SH_JMP_SLOT
2335 ENUMX
2336   BFD_RELOC_SH_RELATIVE
2337 ENUMX
2338   BFD_RELOC_SH_GOTPC
2339 ENUMDOC
2340   Hitachi SH relocs.  Not all of these appear in object files.
2341
2342 ENUM
2343   BFD_RELOC_THUMB_PCREL_BRANCH9
2344 ENUMX
2345   BFD_RELOC_THUMB_PCREL_BRANCH12
2346 ENUMX
2347   BFD_RELOC_THUMB_PCREL_BRANCH23
2348 ENUMDOC
2349   Thumb 23-, 12- and 9-bit pc-relative branches.  The lowest bit must
2350   be zero and is not stored in the instruction.
2351
2352 ENUM
2353   BFD_RELOC_ARC_B22_PCREL
2354 ENUMDOC
2355   Argonaut RISC Core (ARC) relocs.
2356   ARC 22 bit pc-relative branch.  The lowest two bits must be zero and are
2357   not stored in the instruction.  The high 20 bits are installed in bits 26
2358   through 7 of the instruction.
2359 ENUM
2360   BFD_RELOC_ARC_B26
2361 ENUMDOC
2362   ARC 26 bit absolute branch.  The lowest two bits must be zero and are not
2363   stored in the instruction.  The high 24 bits are installed in bits 23
2364   through 0.
2365
2366 ENUM
2367   BFD_RELOC_D10V_10_PCREL_R
2368 ENUMDOC
2369   Mitsubishi D10V relocs.
2370   This is a 10-bit reloc with the right 2 bits
2371   assumed to be 0.
2372 ENUM
2373   BFD_RELOC_D10V_10_PCREL_L
2374 ENUMDOC
2375   Mitsubishi D10V relocs.
2376   This is a 10-bit reloc with the right 2 bits
2377   assumed to be 0.  This is the same as the previous reloc
2378   except it is in the left container, i.e.,
2379   shifted left 15 bits.
2380 ENUM
2381   BFD_RELOC_D10V_18
2382 ENUMDOC
2383   This is an 18-bit reloc with the right 2 bits
2384   assumed to be 0.
2385 ENUM
2386   BFD_RELOC_D10V_18_PCREL
2387 ENUMDOC
2388   This is an 18-bit reloc with the right 2 bits
2389   assumed to be 0.
2390
2391 ENUM
2392   BFD_RELOC_D30V_6
2393 ENUMDOC
2394   Mitsubishi D30V relocs.
2395   This is a 6-bit absolute reloc.
2396 ENUM
2397   BFD_RELOC_D30V_9_PCREL
2398 ENUMDOC
2399   This is a 6-bit pc-relative reloc with
2400   the right 3 bits assumed to be 0.
2401 ENUM
2402   BFD_RELOC_D30V_9_PCREL_R
2403 ENUMDOC
2404   This is a 6-bit pc-relative reloc with
2405   the right 3 bits assumed to be 0. Same
2406   as the previous reloc but on the right side
2407   of the container.
2408 ENUM
2409   BFD_RELOC_D30V_15
2410 ENUMDOC
2411   This is a 12-bit absolute reloc with the
2412   right 3 bitsassumed to be 0.
2413 ENUM
2414   BFD_RELOC_D30V_15_PCREL
2415 ENUMDOC
2416   This is a 12-bit pc-relative reloc with
2417   the right 3 bits assumed to be 0.
2418 ENUM
2419   BFD_RELOC_D30V_15_PCREL_R
2420 ENUMDOC
2421   This is a 12-bit pc-relative reloc with
2422   the right 3 bits assumed to be 0. Same
2423   as the previous reloc but on the right side
2424   of the container.
2425 ENUM
2426   BFD_RELOC_D30V_21
2427 ENUMDOC
2428   This is an 18-bit absolute reloc with
2429   the right 3 bits assumed to be 0.
2430 ENUM
2431   BFD_RELOC_D30V_21_PCREL
2432 ENUMDOC
2433   This is an 18-bit pc-relative reloc with
2434   the right 3 bits assumed to be 0.
2435 ENUM
2436   BFD_RELOC_D30V_21_PCREL_R
2437 ENUMDOC
2438   This is an 18-bit pc-relative reloc with
2439   the right 3 bits assumed to be 0. Same
2440   as the previous reloc but on the right side
2441   of the container.
2442 ENUM
2443   BFD_RELOC_D30V_32
2444 ENUMDOC
2445   This is a 32-bit absolute reloc.
2446 ENUM
2447   BFD_RELOC_D30V_32_PCREL
2448 ENUMDOC
2449   This is a 32-bit pc-relative reloc.
2450
2451 ENUM
2452   BFD_RELOC_M32R_24
2453 ENUMDOC
2454   Mitsubishi M32R relocs.
2455   This is a 24 bit absolute address.
2456 ENUM
2457   BFD_RELOC_M32R_10_PCREL
2458 ENUMDOC
2459   This is a 10-bit pc-relative reloc with the right 2 bits assumed to be 0.
2460 ENUM
2461   BFD_RELOC_M32R_18_PCREL
2462 ENUMDOC
2463   This is an 18-bit reloc with the right 2 bits assumed to be 0.
2464 ENUM
2465   BFD_RELOC_M32R_26_PCREL
2466 ENUMDOC
2467   This is a 26-bit reloc with the right 2 bits assumed to be 0.
2468 ENUM
2469   BFD_RELOC_M32R_HI16_ULO
2470 ENUMDOC
2471   This is a 16-bit reloc containing the high 16 bits of an address
2472   used when the lower 16 bits are treated as unsigned.
2473 ENUM
2474   BFD_RELOC_M32R_HI16_SLO
2475 ENUMDOC
2476   This is a 16-bit reloc containing the high 16 bits of an address
2477   used when the lower 16 bits are treated as signed.
2478 ENUM
2479   BFD_RELOC_M32R_LO16
2480 ENUMDOC
2481   This is a 16-bit reloc containing the lower 16 bits of an address.
2482 ENUM
2483   BFD_RELOC_M32R_SDA16
2484 ENUMDOC
2485   This is a 16-bit reloc containing the small data area offset for use in
2486   add3, load, and store instructions.
2487
2488 ENUM
2489   BFD_RELOC_V850_9_PCREL
2490 ENUMDOC
2491   This is a 9-bit reloc
2492 ENUM
2493   BFD_RELOC_V850_22_PCREL
2494 ENUMDOC
2495   This is a 22-bit reloc
2496
2497 ENUM
2498   BFD_RELOC_V850_SDA_16_16_OFFSET
2499 ENUMDOC
2500   This is a 16 bit offset from the short data area pointer.
2501 ENUM
2502   BFD_RELOC_V850_SDA_15_16_OFFSET
2503 ENUMDOC
2504   This is a 16 bit offset (of which only 15 bits are used) from the
2505   short data area pointer.
2506 ENUM
2507   BFD_RELOC_V850_ZDA_16_16_OFFSET
2508 ENUMDOC
2509   This is a 16 bit offset from the zero data area pointer.
2510 ENUM
2511   BFD_RELOC_V850_ZDA_15_16_OFFSET
2512 ENUMDOC
2513   This is a 16 bit offset (of which only 15 bits are used) from the
2514   zero data area pointer.
2515 ENUM
2516   BFD_RELOC_V850_TDA_6_8_OFFSET
2517 ENUMDOC
2518   This is an 8 bit offset (of which only 6 bits are used) from the
2519   tiny data area pointer.
2520 ENUM
2521   BFD_RELOC_V850_TDA_7_8_OFFSET
2522 ENUMDOC
2523   This is an 8bit offset (of which only 7 bits are used) from the tiny
2524   data area pointer.
2525 ENUM
2526   BFD_RELOC_V850_TDA_7_7_OFFSET
2527 ENUMDOC
2528   This is a 7 bit offset from the tiny data area pointer.
2529 ENUM
2530   BFD_RELOC_V850_TDA_16_16_OFFSET
2531 ENUMDOC
2532   This is a 16 bit offset from the tiny data area pointer.
2533 COMMENT
2534 ENUM
2535   BFD_RELOC_V850_TDA_4_5_OFFSET
2536 ENUMDOC
2537   This is a 5 bit offset (of which only 4 bits are used) from the tiny
2538   data area pointer.
2539 ENUM
2540   BFD_RELOC_V850_TDA_4_4_OFFSET
2541 ENUMDOC
2542   This is a 4 bit offset from the tiny data area pointer.
2543 ENUM
2544   BFD_RELOC_V850_SDA_16_16_SPLIT_OFFSET
2545 ENUMDOC
2546   This is a 16 bit offset from the short data area pointer, with the
2547   bits placed non-contigously in the instruction.
2548 ENUM
2549   BFD_RELOC_V850_ZDA_16_16_SPLIT_OFFSET
2550 ENUMDOC
2551   This is a 16 bit offset from the zero data area pointer, with the
2552   bits placed non-contigously in the instruction.
2553 ENUM
2554   BFD_RELOC_V850_CALLT_6_7_OFFSET
2555 ENUMDOC
2556   This is a 6 bit offset from the call table base pointer.
2557 ENUM
2558   BFD_RELOC_V850_CALLT_16_16_OFFSET
2559 ENUMDOC
2560   This is a 16 bit offset from the call table base pointer.
2561 COMMENT
2562
2563 ENUM
2564   BFD_RELOC_MN10300_32_PCREL
2565 ENUMDOC
2566   This is a 32bit pcrel reloc for the mn10300, offset by two bytes in the
2567   instruction.
2568 ENUM
2569   BFD_RELOC_MN10300_16_PCREL
2570 ENUMDOC
2571   This is a 16bit pcrel reloc for the mn10300, offset by two bytes in the
2572   instruction.
2573
2574 ENUM
2575   BFD_RELOC_TIC30_LDP
2576 ENUMDOC
2577   This is a 8bit DP reloc for the tms320c30, where the most
2578   significant 8 bits of a 24 bit word are placed into the least
2579   significant 8 bits of the opcode.
2580
2581 ENUM
2582   BFD_RELOC_TIC54X_PARTLS7
2583 ENUMDOC
2584   This is a 7bit reloc for the tms320c54x, where the least
2585   significant 7 bits of a 16 bit word are placed into the least
2586   significant 7 bits of the opcode.
2587
2588 ENUM
2589   BFD_RELOC_TIC54X_PARTMS9
2590 ENUMDOC
2591   This is a 9bit DP reloc for the tms320c54x, where the most
2592   significant 9 bits of a 16 bit word are placed into the least
2593   significant 9 bits of the opcode.
2594
2595 ENUM
2596   BFD_RELOC_TIC54X_23
2597 ENUMDOC
2598   This is an extended address 23-bit reloc for the tms320c54x.
2599
2600 ENUM
2601   BFD_RELOC_TIC54X_16_OF_23
2602 ENUMDOC
2603   This is a 16-bit reloc for the tms320c54x, where the least
2604   significant 16 bits of a 23-bit extended address are placed into
2605   the opcode.
2606
2607 ENUM
2608   BFD_RELOC_TIC54X_MS7_OF_23
2609 ENUMDOC
2610   This is a reloc for the tms320c54x, where the most
2611   significant 7 bits of a 23-bit extended address are placed into
2612   the opcode.
2613
2614 ENUM
2615   BFD_RELOC_FR30_48
2616 ENUMDOC
2617   This is a 48 bit reloc for the FR30 that stores 32 bits.
2618 ENUM
2619   BFD_RELOC_FR30_20
2620 ENUMDOC
2621   This is a 32 bit reloc for the FR30 that stores 20 bits split up into
2622   two sections.
2623 ENUM
2624   BFD_RELOC_FR30_6_IN_4
2625 ENUMDOC
2626   This is a 16 bit reloc for the FR30 that stores a 6 bit word offset in
2627   4 bits.
2628 ENUM
2629   BFD_RELOC_FR30_8_IN_8
2630 ENUMDOC
2631   This is a 16 bit reloc for the FR30 that stores an 8 bit byte offset
2632   into 8 bits.
2633 ENUM
2634   BFD_RELOC_FR30_9_IN_8
2635 ENUMDOC
2636   This is a 16 bit reloc for the FR30 that stores a 9 bit short offset
2637   into 8 bits.
2638 ENUM
2639   BFD_RELOC_FR30_10_IN_8
2640 ENUMDOC
2641   This is a 16 bit reloc for the FR30 that stores a 10 bit word offset
2642   into 8 bits.
2643 ENUM
2644   BFD_RELOC_FR30_9_PCREL
2645 ENUMDOC
2646   This is a 16 bit reloc for the FR30 that stores a 9 bit pc relative
2647   short offset into 8 bits.
2648 ENUM
2649   BFD_RELOC_FR30_12_PCREL
2650 ENUMDOC
2651   This is a 16 bit reloc for the FR30 that stores a 12 bit pc relative
2652   short offset into 11 bits.
2653
2654 ENUM
2655   BFD_RELOC_MCORE_PCREL_IMM8BY4
2656 ENUMX
2657   BFD_RELOC_MCORE_PCREL_IMM11BY2
2658 ENUMX
2659   BFD_RELOC_MCORE_PCREL_IMM4BY2
2660 ENUMX
2661   BFD_RELOC_MCORE_PCREL_32
2662 ENUMX
2663   BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2
2664 ENUMX
2665   BFD_RELOC_MCORE_RVA
2666 ENUMDOC
2667   Motorola Mcore relocations.
2668
2669 ENUM
2670   BFD_RELOC_AVR_7_PCREL
2671 ENUMDOC
2672   This is a 16 bit reloc for the AVR that stores 8 bit pc relative
2673   short offset into 7 bits.
2674 ENUM
2675   BFD_RELOC_AVR_13_PCREL
2676 ENUMDOC
2677   This is a 16 bit reloc for the AVR that stores 13 bit pc relative
2678   short offset into 12 bits.
2679 ENUM
2680   BFD_RELOC_AVR_16_PM
2681 ENUMDOC
2682   This is a 16 bit reloc for the AVR that stores 17 bit value (usually
2683   program memory address) into 16 bits.
2684 ENUM
2685   BFD_RELOC_AVR_LO8_LDI
2686 ENUMDOC
2687   This is a 16 bit reloc for the AVR that stores 8 bit value (usually
2688   data memory address) into 8 bit immediate value of LDI insn.
2689 ENUM
2690   BFD_RELOC_AVR_HI8_LDI
2691 ENUMDOC
2692   This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit
2693   of data memory address) into 8 bit immediate value of LDI insn.
2694 ENUM
2695   BFD_RELOC_AVR_HH8_LDI
2696 ENUMDOC
2697   This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit
2698   of program memory address) into 8 bit immediate value of LDI insn.
2699 ENUM
2700   BFD_RELOC_AVR_LO8_LDI_NEG
2701 ENUMDOC
2702   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2703   (usually data memory address) into 8 bit immediate value of SUBI insn.
2704 ENUM
2705   BFD_RELOC_AVR_HI8_LDI_NEG
2706 ENUMDOC
2707   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2708   (high 8 bit of data memory address) into 8 bit immediate value of
2709   SUBI insn.
2710 ENUM
2711   BFD_RELOC_AVR_HH8_LDI_NEG
2712 ENUMDOC
2713   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2714   (most high 8 bit of program memory address) into 8 bit immediate value
2715   of LDI or SUBI insn.
2716 ENUM
2717   BFD_RELOC_AVR_LO8_LDI_PM
2718 ENUMDOC
2719   This is a 16 bit reloc for the AVR that stores 8 bit value (usually
2720   command address) into 8 bit immediate value of LDI insn.
2721 ENUM
2722   BFD_RELOC_AVR_HI8_LDI_PM
2723 ENUMDOC
2724   This is a 16 bit reloc for the AVR that stores 8 bit value (high 8 bit
2725   of command address) into 8 bit immediate value of LDI insn.
2726 ENUM
2727   BFD_RELOC_AVR_HH8_LDI_PM
2728 ENUMDOC
2729   This is a 16 bit reloc for the AVR that stores 8 bit value (most high 8 bit
2730   of command address) into 8 bit immediate value of LDI insn.
2731 ENUM
2732   BFD_RELOC_AVR_LO8_LDI_PM_NEG
2733 ENUMDOC
2734   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2735   (usually command address) into 8 bit immediate value of SUBI insn.
2736 ENUM
2737   BFD_RELOC_AVR_HI8_LDI_PM_NEG
2738 ENUMDOC
2739   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2740   (high 8 bit of 16 bit command address) into 8 bit immediate value
2741   of SUBI insn.
2742 ENUM
2743   BFD_RELOC_AVR_HH8_LDI_PM_NEG
2744 ENUMDOC
2745   This is a 16 bit reloc for the AVR that stores negated 8 bit value
2746   (high 6 bit of 22 bit command address) into 8 bit immediate
2747   value of SUBI insn.
2748 ENUM
2749   BFD_RELOC_AVR_CALL
2750 ENUMDOC
2751   This is a 32 bit reloc for the AVR that stores 23 bit value
2752   into 22 bits.
2753
2754 ENUM
2755   BFD_RELOC_VTABLE_INHERIT
2756 ENUMX
2757   BFD_RELOC_VTABLE_ENTRY
2758 ENUMDOC
2759   These two relocations are used by the linker to determine which of
2760   the entries in a C++ virtual function table are actually used.  When
2761   the --gc-sections option is given, the linker will zero out the entries
2762   that are not used, so that the code for those functions need not be
2763   included in the output.
2764
2765   VTABLE_INHERIT is a zero-space relocation used to describe to the
2766   linker the inheritence tree of a C++ virtual function table.  The
2767   relocation's symbol should be the parent class' vtable, and the
2768   relocation should be located at the child vtable.
2769
2770   VTABLE_ENTRY is a zero-space relocation that describes the use of a
2771   virtual function table entry.  The reloc's symbol should refer to the
2772   table of the class mentioned in the code.  Off of that base, an offset
2773   describes the entry that is being used.  For Rela hosts, this offset
2774   is stored in the reloc's addend.  For Rel hosts, we are forced to put
2775   this offset in the reloc's section offset.
2776
2777 ENUM
2778   BFD_RELOC_IA64_IMM14
2779 ENUMX
2780   BFD_RELOC_IA64_IMM22
2781 ENUMX
2782   BFD_RELOC_IA64_IMM64
2783 ENUMX
2784   BFD_RELOC_IA64_DIR32MSB
2785 ENUMX
2786   BFD_RELOC_IA64_DIR32LSB
2787 ENUMX
2788   BFD_RELOC_IA64_DIR64MSB
2789 ENUMX
2790   BFD_RELOC_IA64_DIR64LSB
2791 ENUMX
2792   BFD_RELOC_IA64_GPREL22
2793 ENUMX
2794   BFD_RELOC_IA64_GPREL64I
2795 ENUMX
2796   BFD_RELOC_IA64_GPREL32MSB
2797 ENUMX
2798   BFD_RELOC_IA64_GPREL32LSB
2799 ENUMX
2800   BFD_RELOC_IA64_GPREL64MSB
2801 ENUMX
2802   BFD_RELOC_IA64_GPREL64LSB
2803 ENUMX
2804   BFD_RELOC_IA64_LTOFF22
2805 ENUMX
2806   BFD_RELOC_IA64_LTOFF64I
2807 ENUMX
2808   BFD_RELOC_IA64_PLTOFF22
2809 ENUMX
2810   BFD_RELOC_IA64_PLTOFF64I
2811 ENUMX
2812   BFD_RELOC_IA64_PLTOFF64MSB
2813 ENUMX
2814   BFD_RELOC_IA64_PLTOFF64LSB
2815 ENUMX
2816   BFD_RELOC_IA64_FPTR64I
2817 ENUMX
2818   BFD_RELOC_IA64_FPTR32MSB
2819 ENUMX
2820   BFD_RELOC_IA64_FPTR32LSB
2821 ENUMX
2822   BFD_RELOC_IA64_FPTR64MSB
2823 ENUMX
2824   BFD_RELOC_IA64_FPTR64LSB
2825 ENUMX
2826   BFD_RELOC_IA64_PCREL21B
2827 ENUMX
2828   BFD_RELOC_IA64_PCREL21BI
2829 ENUMX
2830   BFD_RELOC_IA64_PCREL21M
2831 ENUMX
2832   BFD_RELOC_IA64_PCREL21F
2833 ENUMX
2834   BFD_RELOC_IA64_PCREL22
2835 ENUMX
2836   BFD_RELOC_IA64_PCREL60B
2837 ENUMX
2838   BFD_RELOC_IA64_PCREL64I
2839 ENUMX
2840   BFD_RELOC_IA64_PCREL32MSB
2841 ENUMX
2842   BFD_RELOC_IA64_PCREL32LSB
2843 ENUMX
2844   BFD_RELOC_IA64_PCREL64MSB
2845 ENUMX
2846   BFD_RELOC_IA64_PCREL64LSB
2847 ENUMX
2848   BFD_RELOC_IA64_LTOFF_FPTR22
2849 ENUMX
2850   BFD_RELOC_IA64_LTOFF_FPTR64I
2851 ENUMX
2852   BFD_RELOC_IA64_LTOFF_FPTR64MSB
2853 ENUMX
2854   BFD_RELOC_IA64_LTOFF_FPTR64LSB
2855 ENUMX
2856   BFD_RELOC_IA64_SEGREL32MSB
2857 ENUMX
2858   BFD_RELOC_IA64_SEGREL32LSB
2859 ENUMX
2860   BFD_RELOC_IA64_SEGREL64MSB
2861 ENUMX
2862   BFD_RELOC_IA64_SEGREL64LSB
2863 ENUMX
2864   BFD_RELOC_IA64_SECREL32MSB
2865 ENUMX
2866   BFD_RELOC_IA64_SECREL32LSB
2867 ENUMX
2868   BFD_RELOC_IA64_SECREL64MSB
2869 ENUMX
2870   BFD_RELOC_IA64_SECREL64LSB
2871 ENUMX
2872   BFD_RELOC_IA64_REL32MSB
2873 ENUMX
2874   BFD_RELOC_IA64_REL32LSB
2875 ENUMX
2876   BFD_RELOC_IA64_REL64MSB
2877 ENUMX
2878   BFD_RELOC_IA64_REL64LSB
2879 ENUMX
2880   BFD_RELOC_IA64_LTV32MSB
2881 ENUMX
2882   BFD_RELOC_IA64_LTV32LSB
2883 ENUMX
2884   BFD_RELOC_IA64_LTV64MSB
2885 ENUMX
2886   BFD_RELOC_IA64_LTV64LSB
2887 ENUMX
2888   BFD_RELOC_IA64_IPLTMSB
2889 ENUMX
2890   BFD_RELOC_IA64_IPLTLSB
2891 ENUMX
2892   BFD_RELOC_IA64_COPY
2893 ENUMX
2894   BFD_RELOC_IA64_TPREL22
2895 ENUMX
2896   BFD_RELOC_IA64_TPREL64MSB
2897 ENUMX
2898   BFD_RELOC_IA64_TPREL64LSB
2899 ENUMX
2900   BFD_RELOC_IA64_LTOFF_TP22
2901 ENUMX
2902   BFD_RELOC_IA64_LTOFF22X
2903 ENUMX
2904   BFD_RELOC_IA64_LDXMOV
2905 ENUMDOC
2906   Intel IA64 Relocations.
2907
2908 ENUM
2909   BFD_RELOC_M68HC11_HI8
2910 ENUMDOC
2911   Motorola 68HC11 reloc.
2912   This is the 8 bits high part of an absolute address.
2913 ENUM
2914   BFD_RELOC_M68HC11_LO8
2915 ENUMDOC
2916   Motorola 68HC11 reloc.
2917   This is the 8 bits low part of an absolute address.
2918 ENUM
2919   BFD_RELOC_M68HC11_3B
2920 ENUMDOC
2921   Motorola 68HC11 reloc.
2922   This is the 3 bits of a value.
2923
2924 ENUM
2925   BFD_RELOC_CRIS_BDISP8
2926 ENUMX
2927   BFD_RELOC_CRIS_UNSIGNED_5
2928 ENUMX
2929   BFD_RELOC_CRIS_SIGNED_6
2930 ENUMX
2931   BFD_RELOC_CRIS_UNSIGNED_6
2932 ENUMX
2933   BFD_RELOC_CRIS_UNSIGNED_4
2934 ENUMDOC
2935   These relocs are only used within the CRIS assembler.  They are not
2936   (at present) written to any object files.
2937
2938 ENUM
2939   BFD_RELOC_860_COPY
2940 ENUMX
2941   BFD_RELOC_860_GLOB_DAT
2942 ENUMX
2943   BFD_RELOC_860_JUMP_SLOT
2944 ENUMX
2945   BFD_RELOC_860_RELATIVE
2946 ENUMX
2947   BFD_RELOC_860_PC26
2948 ENUMX
2949   BFD_RELOC_860_PLT26
2950 ENUMX
2951   BFD_RELOC_860_PC16
2952 ENUMX
2953   BFD_RELOC_860_LOW0
2954 ENUMX
2955   BFD_RELOC_860_SPLIT0
2956 ENUMX
2957   BFD_RELOC_860_LOW1
2958 ENUMX
2959   BFD_RELOC_860_SPLIT1
2960 ENUMX
2961   BFD_RELOC_860_LOW2
2962 ENUMX
2963   BFD_RELOC_860_SPLIT2
2964 ENUMX
2965   BFD_RELOC_860_LOW3
2966 ENUMX
2967   BFD_RELOC_860_LOGOT0
2968 ENUMX
2969   BFD_RELOC_860_SPGOT0
2970 ENUMX
2971   BFD_RELOC_860_LOGOT1
2972 ENUMX
2973   BFD_RELOC_860_SPGOT1
2974 ENUMX
2975   BFD_RELOC_860_LOGOTOFF0
2976 ENUMX
2977   BFD_RELOC_860_SPGOTOFF0
2978 ENUMX
2979   BFD_RELOC_860_LOGOTOFF1
2980 ENUMX
2981   BFD_RELOC_860_SPGOTOFF1
2982 ENUMX
2983   BFD_RELOC_860_LOGOTOFF2
2984 ENUMX
2985   BFD_RELOC_860_LOGOTOFF3
2986 ENUMX
2987   BFD_RELOC_860_LOPC
2988 ENUMX
2989   BFD_RELOC_860_HIGHADJ
2990 ENUMX
2991   BFD_RELOC_860_HAGOT
2992 ENUMX
2993   BFD_RELOC_860_HAGOTOFF
2994 ENUMX
2995   BFD_RELOC_860_HAPC
2996 ENUMX
2997   BFD_RELOC_860_HIGH
2998 ENUMX
2999   BFD_RELOC_860_HIGOT
3000 ENUMX
3001   BFD_RELOC_860_HIGOTOFF
3002 ENUMDOC
3003   Intel i860 Relocations.
3004
3005 ENDSENUM
3006   BFD_RELOC_UNUSED
3007 CODE_FRAGMENT
3008 .
3009 .typedef enum bfd_reloc_code_real bfd_reloc_code_real_type;
3010 */
3011
3012
3013 /*
3014 FUNCTION
3015         bfd_reloc_type_lookup
3016
3017 SYNOPSIS
3018         reloc_howto_type *
3019         bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code);
3020
3021 DESCRIPTION
3022         Return a pointer to a howto structure which, when
3023         invoked, will perform the relocation @var{code} on data from the
3024         architecture noted.
3025
3026 */
3027
3028
3029 reloc_howto_type *
3030 bfd_reloc_type_lookup (abfd, code)
3031      bfd *abfd;
3032      bfd_reloc_code_real_type code;
3033 {
3034   return BFD_SEND (abfd, reloc_type_lookup, (abfd, code));
3035 }
3036
3037 static reloc_howto_type bfd_howto_32 =
3038 HOWTO (0, 00, 2, 32, false, 0, complain_overflow_bitfield, 0, "VRT32", false, 0xffffffff, 0xffffffff, true);
3039
3040
3041 /*
3042 INTERNAL_FUNCTION
3043         bfd_default_reloc_type_lookup
3044
3045 SYNOPSIS
3046         reloc_howto_type *bfd_default_reloc_type_lookup
3047         (bfd *abfd, bfd_reloc_code_real_type  code);
3048
3049 DESCRIPTION
3050         Provides a default relocation lookup routine for any architecture.
3051
3052
3053 */
3054
3055 reloc_howto_type *
3056 bfd_default_reloc_type_lookup (abfd, code)
3057      bfd *abfd;
3058      bfd_reloc_code_real_type code;
3059 {
3060   switch (code)
3061     {
3062     case BFD_RELOC_CTOR:
3063       /* The type of reloc used in a ctor, which will be as wide as the
3064          address - so either a 64, 32, or 16 bitter.  */
3065       switch (bfd_get_arch_info (abfd)->bits_per_address)
3066         {
3067         case 64:
3068           BFD_FAIL ();
3069         case 32:
3070           return &bfd_howto_32;
3071         case 16:
3072           BFD_FAIL ();
3073         default:
3074           BFD_FAIL ();
3075         }
3076     default:
3077       BFD_FAIL ();
3078     }
3079   return (reloc_howto_type *) NULL;
3080 }
3081
3082 /*
3083 FUNCTION
3084         bfd_get_reloc_code_name
3085
3086 SYNOPSIS
3087         const char *bfd_get_reloc_code_name (bfd_reloc_code_real_type code);
3088
3089 DESCRIPTION
3090         Provides a printable name for the supplied relocation code.
3091         Useful mainly for printing error messages.
3092 */
3093
3094 const char *
3095 bfd_get_reloc_code_name (code)
3096      bfd_reloc_code_real_type code;
3097 {
3098   if (code > BFD_RELOC_UNUSED)
3099     return 0;
3100   return bfd_reloc_code_real_names[(int)code];
3101 }
3102
3103 /*
3104 INTERNAL_FUNCTION
3105         bfd_generic_relax_section
3106
3107 SYNOPSIS
3108         boolean bfd_generic_relax_section
3109          (bfd *abfd,
3110           asection *section,
3111           struct bfd_link_info *,
3112           boolean *);
3113
3114 DESCRIPTION
3115         Provides default handling for relaxing for back ends which
3116         don't do relaxing -- i.e., does nothing.
3117 */
3118
3119 /*ARGSUSED*/
3120 boolean
3121 bfd_generic_relax_section (abfd, section, link_info, again)
3122      bfd *abfd ATTRIBUTE_UNUSED;
3123      asection *section ATTRIBUTE_UNUSED;
3124      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3125      boolean *again;
3126 {
3127   *again = false;
3128   return true;
3129 }
3130
3131 /*
3132 INTERNAL_FUNCTION
3133         bfd_generic_gc_sections
3134
3135 SYNOPSIS
3136         boolean bfd_generic_gc_sections
3137          (bfd *, struct bfd_link_info *);
3138
3139 DESCRIPTION
3140         Provides default handling for relaxing for back ends which
3141         don't do section gc -- i.e., does nothing.
3142 */
3143
3144 /*ARGSUSED*/
3145 boolean
3146 bfd_generic_gc_sections (abfd, link_info)
3147      bfd *abfd ATTRIBUTE_UNUSED;
3148      struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
3149 {
3150   return true;
3151 }
3152
3153 /*
3154 INTERNAL_FUNCTION
3155         bfd_generic_get_relocated_section_contents
3156
3157 SYNOPSIS
3158         bfd_byte *
3159            bfd_generic_get_relocated_section_contents (bfd *abfd,
3160              struct bfd_link_info *link_info,
3161              struct bfd_link_order *link_order,
3162              bfd_byte *data,
3163              boolean relocateable,
3164              asymbol **symbols);
3165
3166 DESCRIPTION
3167         Provides default handling of relocation effort for back ends
3168         which can't be bothered to do it efficiently.
3169
3170 */
3171
3172 bfd_byte *
3173 bfd_generic_get_relocated_section_contents (abfd, link_info, link_order, data,
3174                                             relocateable, symbols)
3175      bfd *abfd;
3176      struct bfd_link_info *link_info;
3177      struct bfd_link_order *link_order;
3178      bfd_byte *data;
3179      boolean relocateable;
3180      asymbol **symbols;
3181 {
3182   /* Get enough memory to hold the stuff */
3183   bfd *input_bfd = link_order->u.indirect.section->owner;
3184   asection *input_section = link_order->u.indirect.section;
3185
3186   long reloc_size = bfd_get_reloc_upper_bound (input_bfd, input_section);
3187   arelent **reloc_vector = NULL;
3188   long reloc_count;
3189
3190   if (reloc_size < 0)
3191     goto error_return;
3192
3193   reloc_vector = (arelent **) bfd_malloc ((size_t) reloc_size);
3194   if (reloc_vector == NULL && reloc_size != 0)
3195     goto error_return;
3196
3197   /* read in the section */
3198   if (!bfd_get_section_contents (input_bfd,
3199                                  input_section,
3200                                  (PTR) data,
3201                                  0,
3202                                  input_section->_raw_size))
3203     goto error_return;
3204
3205   /* We're not relaxing the section, so just copy the size info */
3206   input_section->_cooked_size = input_section->_raw_size;
3207   input_section->reloc_done = true;
3208
3209   reloc_count = bfd_canonicalize_reloc (input_bfd,
3210                                         input_section,
3211                                         reloc_vector,
3212                                         symbols);
3213   if (reloc_count < 0)
3214     goto error_return;
3215
3216   if (reloc_count > 0)
3217     {
3218       arelent **parent;
3219       for (parent = reloc_vector; *parent != (arelent *) NULL;
3220            parent++)
3221         {
3222           char *error_message = (char *) NULL;
3223           bfd_reloc_status_type r =
3224             bfd_perform_relocation (input_bfd,
3225                                     *parent,
3226                                     (PTR) data,
3227                                     input_section,
3228                                     relocateable ? abfd : (bfd *) NULL,
3229                                     &error_message);
3230
3231           if (relocateable)
3232             {
3233               asection *os = input_section->output_section;
3234
3235               /* A partial link, so keep the relocs */
3236               os->orelocation[os->reloc_count] = *parent;
3237               os->reloc_count++;
3238             }
3239
3240           if (r != bfd_reloc_ok)
3241             {
3242               switch (r)
3243                 {
3244                 case bfd_reloc_undefined:
3245                   if (!((*link_info->callbacks->undefined_symbol)
3246                         (link_info, bfd_asymbol_name (*(*parent)->sym_ptr_ptr),
3247                          input_bfd, input_section, (*parent)->address,
3248                          true)))
3249                     goto error_return;
3250                   break;
3251                 case bfd_reloc_dangerous:
3252                   BFD_ASSERT (error_message != (char *) NULL);
3253                   if (!((*link_info->callbacks->reloc_dangerous)
3254                         (link_info, error_message, input_bfd, input_section,
3255                          (*parent)->address)))
3256                     goto error_return;
3257                   break;
3258                 case bfd_reloc_overflow:
3259                   if (!((*link_info->callbacks->reloc_overflow)
3260                         (link_info, bfd_asymbol_name (*(*parent)->sym_ptr_ptr),
3261                          (*parent)->howto->name, (*parent)->addend,
3262                          input_bfd, input_section, (*parent)->address)))
3263                     goto error_return;
3264                   break;
3265                 case bfd_reloc_outofrange:
3266                 default:
3267                   abort ();
3268                   break;
3269                 }
3270
3271             }
3272         }
3273     }
3274   if (reloc_vector != NULL)
3275     free (reloc_vector);
3276   return data;
3277
3278 error_return:
3279   if (reloc_vector != NULL)
3280     free (reloc_vector);
3281   return NULL;
3282 }