bfd/reloc.c

   1 /* BFD support for handling relocation entries.
   2    Copyright (C) 1990-1991 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   4
   5 This file is part of BFD, the Binary File Descriptor library.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /*
  22 SECTION
  23         Relocations
  24
  25         BFD maintains relocations in much the same was as it maintains
  26         symbols; they are left alone until required, then read in
  27         en-mass and traslated into an internal form. There is a common
  28         routine <<bfd_perform_relocation>> which acts upon the
  29         canonical form to to the actual fixup.
  30
  31         Note that relocations are maintained on a per section basis,
  32         whilst symbols are maintained on a per BFD basis.
  33
  34         All a back end has to do to fit the BFD interface is to create
  35         as many <<struct reloc_cache_entry>> as there are relocations
  36         in a particuar section, and fill in the right bits:
  37
  38 @menu
  39 @* typedef arelent::
  40 @* howto manager::
  41 @end menu
  42
  43 */
  44 #include "bfd.h"
  45 #include "sysdep.h"
  46 #include "libbfd.h"
  47 #include "seclet.h"
  48 /*
  49 DOCDD
  50 INODE
  51         typedef arelent, howto manager, Relocations, Relocations
  52
  53 SUBSECTION
  54         typedef arelent
  55
  56         This is the structure of a relocation entry:
  57
  58 CODE_FRAGMENT
  59 .
  60 .typedef enum bfd_reloc_status
  61 .{
  62 .       {* No errors detected *}
  63 .  bfd_reloc_ok,
  64 .
  65 .       {* The relocation was performed, but there was an overflow. *}
  66 .  bfd_reloc_overflow,
  67 .
  68 .       {* The address to relocate was not within the section supplied*}
  69 .  bfd_reloc_outofrange,
  70 .
  71 .       {* Used by special functions *}
  72 .  bfd_reloc_continue,
  73 .
  74 .       {* Unused *}
  75 .  bfd_reloc_notsupported,
  76 .
  77 .       {* Unsupported relocation size requested.  *}
  78 .  bfd_reloc_other,
  79 .
  80 .       {* The symbol to relocate against was undefined.*}
  81 .  bfd_reloc_undefined,
  82 .
  83 .       {* The relocation was performed, but may not be ok - presently
  84 .          generated only when linking i960 coff files with i960 b.out
  85 .          symbols. *}
  86 .  bfd_reloc_dangerous
  87 . }
  88 . bfd_reloc_status_type;
  89 .
  90 .
  91 .typedef struct reloc_cache_entry
  92 .{
  93 .       {* A pointer into the canonical table of pointers  *}
  94 .  struct symbol_cache_entry **sym_ptr_ptr;
  95 .
  96 .       {* offset in section *}
  97 .  rawdata_offset address;
  98 .
  99 .       {* addend for relocation value *}
 100 .  bfd_vma addend;
 101 .
 102 .       {* Pointer to how to perform the required relocation *}
 103 .  CONST struct reloc_howto_struct *howto;
 104 .
 105 .} arelent;
 106
 107 */
 108
 109 /*
 110 DESCRIPTION
 111
 112         Here is a description of each of the fields within a relent:
 113
 114         o sym_ptr_ptr
 115
 116         The symbol table pointer points to a pointer to the symbol
 117         associated with the relocation request. This would naturally
 118         be the pointer into the table returned by the back end's
 119         get_symtab action. @xref{Symbols}. The symbol is referenced
 120         through a pointer to a pointer so that tools like the linker
 121         can fix up all the symbols of the same name by modifying only
 122         one pointer. The relocation routine looks in the symbol and
 123         uses the base of the section the symbol is attached to and the
 124         value of the symbol as the initial relocation offset. If the
 125         symbol pointer is zero, then the section provided is looked up.
 126
 127         o address
 128
 129         The address field gives the offset in bytes from the base of
 130         the section data which owns the relocation record to the first
 131         byte of relocatable information. The actual data relocated
 132         will be relative to this point - for example, a relocation
 133         type which modifies the bottom two bytes of a four byte word
 134         would not touch the first byte pointed to in a big endian
 135         world.
 136
 137         o addend
 138
 139         The addend is a value provided by the back end to be added (!)
 140         to the relocation offset. Its interpretation is dependent upon
 141         the howto. For example, on the 68k the code:
 142
 143
 144 |        char foo[];
 145 |        main()
 146 |                {
 147 |                return foo[0x12345678];
 148 |                }
 149
 150         Could be compiled into:
 151
 152 |        linkw fp,#-4
 153 |        moveb @@#12345678,d0
 154 |        extbl d0
 155 |        unlk fp
 156 |        rts
 157
 158
 159         This could create a reloc pointing to foo, but leave the
 160         offset in the data (something like)
 161
 162
 163 |RELOCATION RECORDS FOR [.text]:
 164 |offset   type      value
 165 |00000006 32        _foo
 166 |
 167 |00000000 4e56 fffc          ; linkw fp,#-4
 168 |00000004 1039 1234 5678     ; moveb @@#12345678,d0
 169 |0000000a 49c0               ; extbl d0
 170 |0000000c 4e5e               ; unlk fp
 171 |0000000e 4e75               ; rts
 172
 173
 174         Using coff and an 88k, some instructions don't have enough
 175         space in them to represent the full address range, and
 176         pointers have to be loaded in two parts. So you'd get something like:
 177
 178
 179 |        or.u     r13,r0,hi16(_foo+0x12345678)
 180 |        ld.b     r2,r13,lo16(_foo+0x12345678)
 181 |        jmp      r1
 182
 183
 184         This whould create two relocs, both pointing to _foo, and with
 185         0x12340000 in their addend field. The data would consist of:
 186
 187
 188 |RELOCATION RECORDS FOR [.text]:
 189 |offset   type      value
 190 |00000002 HVRT16    _foo+0x12340000
 191 |00000006 LVRT16    _foo+0x12340000
 192
 193 |00000000 5da05678           ; or.u r13,r0,0x5678
 194 |00000004 1c4d5678           ; ld.b r2,r13,0x5678
 195 |00000008 f400c001           ; jmp r1
 196
 197
 198         The relocation routine digs out the value from the data, adds
 199         it to the addend to get the original offset and then adds the
 200         value of _foo. Note that all 32 bits have to be kept around
 201         somewhere, to cope with carry from bit 15 to bit 16.
 202
 203         On further example is the sparc and the a.out format. The
 204         sparc has a similar problem to the 88k, in that some
 205         instructions don't have room for an entire offset, but on the
 206         sparc the parts are created odd sized lumps. The designers of
 207         the a.out format chose not to use the data within the section
 208         for storing part of the offset; all the offset is kept within
 209         the reloc. Any thing in the data should be ignored.
 210
 211 |        save %sp,-112,%sp
 212 |        sethi %hi(_foo+0x12345678),%g2
 213 |        ldsb [%g2+%lo(_foo+0x12345678)],%i0
 214 |        ret
 215 |        restore
 216
 217         Both relocs contains a pointer to foo, and the offsets would
 218         contain junk.
 219
 220
 221 |RELOCATION RECORDS FOR [.text]:
 222 |offset   type      value
 223 |00000004 HI22      _foo+0x12345678
 224 |00000008 LO10      _foo+0x12345678
 225
 226 |00000000 9de3bf90     ; save %sp,-112,%sp
 227 |00000004 05000000     ; sethi %hi(_foo+0),%g2
 228 |00000008 f048a000     ; ldsb [%g2+%lo(_foo+0)],%i0
 229 |0000000c 81c7e008     ; ret
 230 |00000010 81e80000     ; restore
 231
 232
 233         o howto
 234
 235         The howto field can be imagined as a
 236         relocation instruction. It is a pointer to a struct which
 237         contains information on what to do with all the other
 238         information in the reloc record and data section. A back end
 239         would normally have a relocation instruction set and turn
 240         relocations into pointers to the correct structure on input -
 241         but it would be possible to create each howto field on demand.
 242
 243 */
 244
 245
 246 /*
 247 SUBSUBSECTION
 248         <<reloc_howto_type>>
 249
 250         The <<reloc_howto_type>> is a structure which contains all the
 251         information that BFD needs to know to tie up a back end's data.
 252
 253 CODE_FRAGMENT
 254 .struct symbol_cache_entry;             {* Forward declaration *}
 255 .
 256 .typedef CONST struct reloc_howto_struct
 257 .{
 258 .       {*  The type field has mainly a documetary use - the back end can
 259 .           to what it wants with it, though the normally the back end's
 260 .           external idea of what a reloc number would be would be stored
 261 .           in this field. For example, the a PC relative word relocation
 262 .           in a coff environment would have the type 023 - because that's
 263 .           what the outside world calls a R_PCRWORD reloc. *}
 264 .  unsigned int type;
 265 .
 266 .       {*  The value the final relocation is shifted right by. This drops
 267 .           unwanted data from the relocation.  *}
 268 .  unsigned int rightshift;
 269 .
 270 .       {*  The size of the item to be relocated - 0, is one byte, 1 is 2
 271 .           bytes, 3 is four bytes.  A -ve value indicates that the
 272 .           result is to be subtracted from the data*}
 273 .  int size;
 274 .
 275 .       {*  Now obsolete *}
 276 .  unsigned int bitsize;
 277 .
 278 .       {*  Notes that the relocation is relative to the location in the
 279 .           data section of the addend. The relocation function will
 280 .           subtract from the relocation value the address of the location
 281 .           being relocated. *}
 282 .  boolean pc_relative;
 283 .
 284 .       {*  Now obsolete *}
 285 .  unsigned int bitpos;
 286 .
 287 .       {*  Now obsolete *}
 288 .  boolean absolute;
 289 .
 290 .       {* Causes the relocation routine to return an error if overflow
 291 .          is detected when relocating. *}
 292 .  boolean complain_on_overflow;
 293 .
 294 .       {* If this field is non null, then the supplied function is
 295 .          called rather than the normal function. This allows really
 296 .          strange relocation methods to be accomodated (eg, i960 callj
 297 .          instructions). *}
 298 .  bfd_reloc_status_type (*special_function)
 299 .                                   PARAMS ((bfd *abfd,
 300 .                                            arelent *reloc_entry,
 301 .                                            struct symbol_cache_entry *symbol,
 302 .                                            PTR data,
 303 .                                            asection *input_section,
 304 .                                            bfd *output_bfd));
 305 .
 306 .       {* The textual name of the relocation type. *}
 307 .  char *name;
 308 .
 309 .       {* When performing a partial link, some formats must modify the
 310 .          relocations rather than the data - this flag signals this.*}
 311 .  boolean partial_inplace;
 312 .
 313 .       {* The src_mask is used to select what parts of the read in data
 314 .          are to be used in the relocation sum. Eg, if this was an 8 bit
 315 .          bit of data which we read and relocated, this would be
 316 .          0x000000ff. When we have relocs which have an addend, such as
 317 .          sun4 extended relocs, the value in the offset part of a
 318 .          relocating field is garbage so we never use it. In this case
 319 .          the mask would be 0x00000000. *}
 320 .  bfd_word src_mask;
 321 .
 322 .       {* The dst_mask is what parts of the instruction are replaced
 323 .          into the instruction. In most cases src_mask == dst_mask,
 324 .          except in the above special case, where dst_mask would be
 325 .          0x000000ff, and src_mask would be 0x00000000.   *}
 326 .  bfd_word dst_mask;
 327 .
 328 .       {* When some formats create PC relative instructions, they leave
 329 .          the value of the pc of the place being relocated in the offset
 330 .          slot of the instruction, so that a PC relative relocation can
 331 .          be made just by adding in an ordinary offset (eg sun3 a.out).
 332 .          Some formats leave the displacement part of an instruction
 333 .          empty (eg m88k bcs), this flag signals the fact.*}
 334 .  boolean pcrel_offset;
 335 .
 336 .} reloc_howto_type;
 337
 338 */
 339
 340 /*
 341 FUNCTION
 342         the HOWTO macro
 343
 344 DESCRIPTION
 345         The HOWTO define is horrible and will go away.
 346
 347
 348 .#define HOWTO(C, R,S,B, P, BI, ABS, O, SF, NAME, INPLACE, MASKSRC, MASKDST, PC) \
 349 .  {(unsigned)C,R,S,B, P, BI, ABS,O,SF,NAME,INPLACE,MASKSRC,MASKDST,PC}
 350
 351 DESCRIPTION
 352         And will be replaced with the totally magic way. But for the
 353         moment, we are compatible, so do it this way..
 354
 355
 356 .#define NEWHOWTO( FUNCTION, NAME,SIZE,REL,IN) HOWTO(0,0,SIZE,0,REL,0,false,false,FUNCTION, NAME,false,0,0,IN)
 357 .
 358 DESCRIPTION
 359         Helper routine to turn a symbol into a relocation value.
 360
 361 .#define HOWTO_PREPARE(relocation, symbol)      \
 362 .  {                                            \
 363 .  if (symbol != (asymbol *)NULL) {             \
 364 .    if (symbol->section == &bfd_com_section) { \
 365 .      relocation = 0;                          \
 366 .    }                                          \
 367 .    else {                                     \
 368 .      relocation = symbol->value;              \
 369 .    }                                          \
 370 .  }                                            \
 371 .}
 372
 373 */
 374
 375 /*
 376 TYPEDEF
 377         reloc_chain
 378
 379 DESCRIPTION
 380
 381         How relocs are tied together
 382
 383 .typedef unsigned char bfd_byte;
 384 .
 385 .typedef struct relent_chain {
 386 .  arelent relent;
 387 .  struct   relent_chain *next;
 388 .} arelent_chain;
 389
 390 */
 391
 392
 393
 394 /*
 395 FUNCTION
 396         bfd_perform_relocation
 397
 398 SYNOPSIS
 399         bfd_reloc_status_type
 400                 bfd_perform_relocation
 401                         (bfd * abfd,
 402                         arelent *reloc_entry,
 403                         PTR data,
 404                         asection *input_section,
 405                         bfd *output_bfd);
 406
 407 DESCRIPTION
 408         If an output_bfd is supplied to this function the generated
 409         image will be relocatable, the relocations are copied to the
 410         output file after they have been changed to reflect the new
 411         state of the world. There are two ways of reflecting the
 412         results of partial linkage in an output file; by modifying the
 413         output data in place, and by modifying the relocation record.
 414         Some native formats (eg basic a.out and basic coff) have no
 415         way of specifying an addend in the relocation type, so the
 416         addend has to go in the output data.  This is no big deal
 417         since in these formats the output data slot will always be big
 418         enough for the addend. Complex reloc types with addends were
 419         invented to solve just this problem.
 420
 421 */
 422
 423
 424 bfd_reloc_status_type
 425 DEFUN(bfd_perform_relocation,(abfd,
 426                               reloc_entry,
 427                               data,
 428                               input_section,
 429                               output_bfd),
 430       bfd *abfd AND
 431       arelent *reloc_entry AND
 432       PTR data AND
 433       asection *input_section AND
 434       bfd *output_bfd)
 435 {
 436   bfd_vma relocation;
 437   bfd_reloc_status_type flag = bfd_reloc_ok;
 438   bfd_vma addr = reloc_entry->address ;
 439   bfd_vma output_base = 0;
 440   reloc_howto_type *howto = reloc_entry->howto;
 441   asection *reloc_target_output_section ;
 442
 443   asymbol *symbol;
 444
 445   symbol = *( reloc_entry->sym_ptr_ptr);
 446   if ((symbol->section == &bfd_abs_section)
 447       && output_bfd != (bfd *)NULL)
 448   {
 449     reloc_entry->address += input_section->output_offset;
 450
 451     return bfd_reloc_ok;
 452
 453   }
 454
 455   if ((symbol->section == &bfd_und_section) && output_bfd == (bfd *)NULL) {
 456     flag = bfd_reloc_undefined;
 457   }
 458
 459   if (howto->special_function) {
 460     bfd_reloc_status_type cont;
 461     cont = howto->special_function(abfd,
 462                                    reloc_entry,
 463                                    symbol,
 464                                    data,
 465                                    input_section,
 466                                    output_bfd);
 467     if (cont != bfd_reloc_continue) return cont;
 468   }
 469
 470   /*
 471     Work out which section the relocation is targetted at and the
 472     initial relocation command value.
 473     */
 474
 475
 476   if (symbol->section == &bfd_com_section) {
 477     relocation = 0;
 478   }
 479   else {
 480     relocation = symbol->value;
 481   }
 482
 483
 484   reloc_target_output_section = symbol->section->output_section;
 485
 486   if (output_bfd && howto->partial_inplace==false) {
 487     output_base = 0;
 488   }
 489   else {
 490     output_base = reloc_target_output_section->vma;
 491
 492   }
 493
 494   relocation += output_base +   symbol->section->output_offset;
 495
 496
 497   relocation += reloc_entry->addend ;
 498
 499
 500   if(reloc_entry->address > input_section->_cooked_size)
 501   {
 502     return bfd_reloc_outofrange;
 503   }
 504
 505
 506   if (howto->pc_relative == true)
 507   {
 508     /*
 509       Anything which started out as pc relative should end up that
 510       way too.
 511
 512       There are two ways we can see a pcrel instruction. Sometimes
 513       the pcrel displacement has been partially calculated, it
 514       includes the distance from the start of the section to the
 515       instruction in it (eg sun3), and sometimes the field is
 516       totally blank - eg m88kbcs.
 517       */
 518
 519
 520     relocation -=
 521      input_section->output_section->vma + input_section->output_offset;
 522
 523     if (howto->pcrel_offset == true) {
 524       relocation -= reloc_entry->address;
 525     }
 526
 527   }
 528
 529   if (output_bfd!= (bfd *)NULL)
 530   {
 531     if ( howto->partial_inplace == false)
 532     {
 533       /*
 534         This is a partial relocation, and we want to apply the relocation
 535         to the reloc entry rather than the raw data. Modify the reloc
 536         inplace to reflect what we now know.
 537         */
 538       reloc_entry->addend = relocation  ;
 539       reloc_entry->address +=  input_section->output_offset;
 540       return flag;
 541     }
 542     else
 543     {
 544       /* This is a partial relocation, but inplace, so modify the
 545          reloc record a bit.
 546
 547          If we've relocated with a symbol with a section, change
 548          into a ref to  the section belonging to the symbol
 549          */
 550
 551       reloc_entry->address += input_section->output_offset;
 552
 553       if (abfd->xvec->flavour == bfd_target_coff_flavour)
 554       {
 555         relocation -= reloc_entry->addend;
 556         reloc_entry->addend = 0;
 557       }
 558       else
 559       {
 560         reloc_entry->addend = relocation  ;
 561       }
 562     }
 563   }
 564   else
 565   {
 566     reloc_entry->addend = 0;
 567   }
 568
 569
 570   /*
 571     Either we are relocating all the way, or we don't want to apply
 572     the relocation to the reloc entry (probably because there isn't
 573     any room in the output format to describe addends to relocs)
 574     */
 575   relocation >>= howto->rightshift;
 576
 577   /* Shift everything up to where it's going to be used */
 578
 579   relocation <<= howto->bitpos;
 580
 581   /* Wait for the day when all have the mask in them */
 582
 583   /* What we do:
 584      i instruction to be left alone
 585      o offset within instruction
 586      r relocation offset to apply
 587      S src mask
 588      D dst mask
 589      N ~dst mask
 590      A part 1
 591      B part 2
 592      R result
 593
 594      Do this:
 595      i i i i i o o o o o        from bfd_get<size>
 596      and           S S S S S    to get the size offset we want
 597      +   r r r r r r r r r r  to get the final value to place
 598      and           D D D D D  to chop to right size
 599      -----------------------
 600      A A A A A
 601      And this:
 602      ...   i i i i i o o o o o  from bfd_get<size>
 603      and   N N N N N            get instruction
 604      -----------------------
 605      ...   B B B B B
 606
 607      And then:
 608      B B B B B
 609      or              A A A A A
 610      -----------------------
 611      R R R R R R R R R R        put into bfd_put<size>
 612      */
 613
 614 #define DOIT(x) \
 615   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
 616
 617    switch (howto->size)
 618    {
 619     case 0:
 620     {
 621       char x = bfd_get_8(abfd, (char *)data + addr);
 622       DOIT(x);
 623       bfd_put_8(abfd,x, (unsigned char *) data + addr);
 624     }
 625      break;
 626
 627     case 1:
 628     {
 629       short x = bfd_get_16(abfd, (bfd_byte *)data + addr);
 630       DOIT(x);
 631       bfd_put_16(abfd, x,   (unsigned char *)data + addr);
 632     }
 633      break;
 634     case 2:
 635     {
 636       long  x = bfd_get_32(abfd, (bfd_byte *) data + addr);
 637       DOIT(x);
 638       bfd_put_32(abfd,x,    (bfd_byte *)data + addr);
 639     }
 640      break;
 641     case -2:
 642     {
 643       long  x = bfd_get_32(abfd, (bfd_byte *) data + addr);
 644       relocation = -relocation;
 645       DOIT(x);
 646       bfd_put_32(abfd,x,    (bfd_byte *)data + addr);
 647     }
 648      break;
 649
 650     case 3:
 651
 652      /* Do nothing */
 653      break;
 654     default:
 655      return bfd_reloc_other;
 656    }
 657
 658   return flag;
 659 }
 660
 661
 662
 663 /*
 664 DOCDD
 665 INODE
 666         howto manager,  , typedef arelent, Relocations
 667
 668 SECTION
 669         The howto manager
 670
 671         When an application wants to create a relocation, but doesn't
 672         know what the target machine might call it, it can find out by
 673         using this bit of code.
 674
 675 */
 676
 677 /*
 678 TYPEDEF
 679         bfd_reloc_code_type
 680
 681 DESCRIPTION
 682         The insides of a reloc code
 683
 684 CODE_FRAGMENT
 685 .
 686 .typedef enum bfd_reloc_code_real
 687 .
 688 .{
 689 .       {* 16 bits wide, simple reloc *}
 690 .  BFD_RELOC_16,
 691 .
 692 .       {* 8 bits wide, but used to form an address like 0xffnn *}
 693 .  BFD_RELOC_8_FFnn,
 694 .
 695 .       {* 8 bits wide, simple *}
 696 .  BFD_RELOC_8,
 697 .
 698 .       {* 8 bits wide, pc relative *}
 699 .  BFD_RELOC_8_PCREL,
 700 .
 701 .       {* The type of reloc used to build a contructor table - at the
 702 .          moment probably a 32 bit wide abs address, but the cpu can
 703 .          choose. *}
 704 .
 705 .  BFD_RELOC_CTOR,
 706 .
 707 .       {* 32 bits wide, simple reloc *}
 708 .  BFD_RELOC_32,
 709 .       {* 32 bits, PC-relative *}
 710 .  BFD_RELOC_32_PCREL,
 711 .
 712 .       {* High 22 bits of 32-bit value; simple reloc.  *}
 713 .  BFD_RELOC_HI22,
 714 .       {* Low 10 bits.  *}
 715 .  BFD_RELOC_LO10,
 716 .
 717 .       {* Reloc types used for i960/b.out.  *}
 718 .  BFD_RELOC_24_PCREL,
 719 .  BFD_RELOC_I960_CALLJ,
 720 .
 721 .  BFD_RELOC_16_PCREL,
 722 .       {* 32-bit pc-relative, shifted right 2 bits (i.e., 30-bit
 723 .          word displacement, e.g. for SPARC) *}
 724 .  BFD_RELOC_32_PCREL_S2,
 725 .
 726 .  {* now for the sparc/elf codes *}
 727 .  BFD_RELOC_NONE,              {* actually used *}
 728 .  BFD_RELOC_SPARC_WDISP22,
 729 .  BFD_RELOC_SPARC22,
 730 .  BFD_RELOC_SPARC13,
 731 .  BFD_RELOC_SPARC_BASE13,
 732 .  BFD_RELOC_SPARC_GOT10,
 733 .  BFD_RELOC_SPARC_GOT13,
 734 .  BFD_RELOC_SPARC_GOT22,
 735 .  BFD_RELOC_SPARC_PC10,
 736 .  BFD_RELOC_SPARC_PC22,
 737 .  BFD_RELOC_SPARC_WPLT30,
 738 .  BFD_RELOC_SPARC_COPY,
 739 .  BFD_RELOC_SPARC_GLOB_DAT,
 740 .  BFD_RELOC_SPARC_JMP_SLOT,
 741 .  BFD_RELOC_SPARC_RELATIVE,
 742 .  BFD_RELOC_SPARC_UA32,
 743 .
 744 .  {* this one is a.out specific? *}
 745 .  BFD_RELOC_SPARC_BASE22,
 746 .
 747 .  {* this must be the highest numeric value *}
 748 .  BFD_RELOC_UNUSED
 749 . } bfd_reloc_code_real_type;
 750 */
 751
 752
 753
 754 /*
 755 SECTION
 756         bfd_reloc_type_lookup
 757
 758 SYNOPSIS
 759         CONST struct reloc_howto_struct *
 760         bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code);
 761
 762 DESCRIPTION
 763         This routine returns a pointer to a howto struct which when
 764         invoked, will perform the supplied relocation on data from the
 765         architecture noted.
 766
 767 */
 768
 769
 770 CONST struct reloc_howto_struct *
 771 DEFUN(bfd_reloc_type_lookup,(abfd, code),
 772       bfd *abfd AND
 773       bfd_reloc_code_real_type code)
 774 {
 775   return BFD_SEND (abfd, reloc_type_lookup, (abfd, code));
 776 }
 777
 778 static reloc_howto_type bfd_howto_32 =
 779  HOWTO(0, 00,2,32,false,0,false,true,0,"VRT32", false,0xffffffff,0xffffffff,true);
 780
 781
 782 /*
 783 INTERNAL_FUNCTION
 784         bfd_default_reloc_type_lookup
 785
 786 SYNOPSIS
 787         CONST struct reloc_howto_struct *bfd_default_reloc_type_lookup
 788         (CONST struct bfd_arch_info *,
 789          bfd_reloc_code_real_type  code);
 790
 791 DESCRIPTION
 792         Provides a default relocation lookuperer for any architectue
 793
 794
 795 */
 796 CONST struct reloc_howto_struct *
 797 DEFUN(bfd_default_reloc_type_lookup,(arch,  code),
 798      CONST struct bfd_arch_info *arch AND
 799       bfd_reloc_code_real_type  code)
 800 {
 801     switch (code)
 802     {
 803        case BFD_RELOC_CTOR:
 804         /* The type of reloc used in a ctor, which will be as wide as the
 805            address - so either a 64, 32, or 16 bitter.. */
 806         switch (arch->bits_per_address) {
 807            case 64:
 808             BFD_FAIL();
 809            case 32:
 810             return &bfd_howto_32;
 811            case 16:
 812             BFD_FAIL();
 813            default:
 814             BFD_FAIL();
 815         }
 816        default:
 817         BFD_FAIL();
 818     }
 819 return (CONST struct reloc_howto_struct *)NULL;
 820 }
 821
 822
 823 /*
 824 INTERNAL_FUNCTION
 825         bfd_generic_relax_section
 826
 827 SYNOPSIS
 828         boolean bfd_generic_relax_section
 829          (bfd *abfd,
 830           asection *section,
 831           asymbol **symbols);
 832
 833 DESCRIPTION
 834         Provides default handling for relaxing for back ends which
 835         don't do relaxing -- i.e., does nothing.
 836 */
 837
 838 boolean
 839 DEFUN(bfd_generic_relax_section,(abfd, section, symbols),
 840       bfd *abfd AND
 841       asection *section AND
 842       asymbol **symbols)
 843 {
 844
 845   return false;
 846
 847 }
 848
 849
 850 /*
 851 INTERNAL_FUNCTION
 852         bfd_generic_get_relocated_section_contents
 853
 854 SYNOPSIS
 855         bfd_byte *
 856            bfd_generic_get_relocated_section_contents(bfd *abfd,
 857              struct bfd_seclet_struct  *seclet,
 858              bfd_byte *data)
 859
 860 DESCRIPTION
 861         Provides default handling of relocation effort for back ends
 862         which can't be bothered to do it efficiently.
 863
 864 */
 865
 866 bfd_byte *
 867 DEFUN(bfd_generic_get_relocated_section_contents,(abfd, seclet, data),
 868       bfd *abfd AND
 869       struct bfd_seclet_struct *seclet AND
 870       bfd_byte *data)
 871 {
 872   extern bfd_error_vector_type bfd_error_vector;
 873
 874   /* Get enough memory to hold the stuff */
 875   bfd *input_bfd = seclet->u.indirect.section->owner;
 876   asection *input_section = seclet->u.indirect.section;
 877
 878
 879
 880   bfd_size_type reloc_size = bfd_get_reloc_upper_bound(input_bfd,
 881                                                        input_section);
 882   arelent **reloc_vector = (arelent **) alloca(reloc_size);
 883
 884   /* read in the section */
 885   bfd_get_section_contents(input_bfd,
 886                            input_section,
 887                            data,
 888                            0,
 889                            input_section->_raw_size);
 890
 891 /* We're not relaxing the section, so just copy the size info */
 892   input_section->_cooked_size = input_section->_raw_size;
 893   input_section->reloc_done = true;
 894
 895
 896   if (bfd_canonicalize_reloc(input_bfd,
 897                              input_section,
 898                              reloc_vector,
 899                              seclet->u.indirect.symbols) )
 900   {
 901     arelent **parent;
 902     for (parent = reloc_vector;  * parent != (arelent *)NULL;
 903          parent++)
 904     {
 905       bfd_reloc_status_type r=
 906        bfd_perform_relocation(input_bfd,
 907                               *parent,
 908                               data,
 909                               input_section, 0);
 910
 911
 912       if (r != bfd_reloc_ok)
 913       {
 914         switch (r)
 915         {
 916         case bfd_reloc_undefined:
 917           bfd_error_vector.undefined_symbol(*parent, seclet);
 918           break;
 919         case bfd_reloc_dangerous:
 920           bfd_error_vector.reloc_dangerous(*parent, seclet);
 921           break;
 922         case bfd_reloc_outofrange:
 923         case bfd_reloc_overflow:
 924           bfd_error_vector.reloc_value_truncated(*parent, seclet);
 925           break;
 926         default:
 927           abort();
 928           break;
 929         }
 930
 931       }
 932     }
 933   }
 934
 935
 936   return data;
 937
 938
 939 }
 940