bfd/coff-a29k.c

   1 /* BFD back-end for AMD 29000 COFF binaries.
   2    Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
   3    Contributed by David Wood at New York University 7/8/91.
   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 #define A29K 1
  22
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "libbfd.h"
  26 #include "obstack.h"
  27 #include "coff/a29k.h"
  28 #include "coff/internal.h"
  29 #include "libcoff.h"
  30
  31 static long get_symbol_value PARAMS ((asymbol *));
  32 static bfd_reloc_status_type a29k_reloc
  33   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  34 static boolean coff_a29k_relocate_section
  35   PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
  36            struct internal_reloc *, struct internal_syment *, asection **));
  37
  38 #define INSERT_HWORD(WORD,HWORD)        \
  39     (((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))
  40 #define EXTRACT_HWORD(WORD) \
  41     (((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff)
  42 #define SIGN_EXTEND_HWORD(HWORD) \
  43     ((HWORD) & 0x8000 ? (HWORD)|0xffff0000 : (HWORD))
  44
  45 /* Provided the symbol, returns the value reffed */
  46 static long
  47 get_symbol_value (symbol)
  48      asymbol *symbol;
  49 {
  50   long relocation = 0;
  51
  52   if (bfd_is_com_section (symbol->section))
  53   {
  54     relocation = 0;
  55   }
  56   else
  57   {
  58     relocation = symbol->value +
  59      symbol->section->output_section->vma +
  60       symbol->section->output_offset;
  61   }
  62
  63   return(relocation);
  64 }
  65
  66 /* this function is in charge of performing all the 29k relocations */
  67
  68 static bfd_reloc_status_type
  69 a29k_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
  70             error_message)
  71      bfd *abfd;
  72      arelent *reloc_entry;
  73      asymbol *symbol_in;
  74      PTR data;
  75      asection *input_section;
  76      bfd *output_bfd;
  77      char **error_message;
  78 {
  79   /* the consth relocation comes in two parts, we have to remember
  80      the state between calls, in these variables */
  81   static boolean part1_consth_active = false;
  82   static unsigned long part1_consth_value;
  83
  84   unsigned long insn;
  85   unsigned long sym_value;
  86   unsigned long unsigned_value;
  87   unsigned short r_type;
  88   long signed_value;
  89
  90   unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
  91   bfd_byte  *hit_data =addr + (bfd_byte *)(data);
  92
  93   r_type = reloc_entry->howto->type;
  94
  95   if (output_bfd) {
  96     /* Partial linking - do nothing */
  97     reloc_entry->address += input_section->output_offset;
  98     return bfd_reloc_ok;
  99
 100   }
 101
 102   if (symbol_in != NULL
 103       && bfd_is_und_section (symbol_in->section))
 104   {
 105     /* Keep the state machine happy in case we're called again */
 106     if (r_type == R_IHIHALF)
 107     {
 108       part1_consth_active = true;
 109       part1_consth_value  = 0;
 110     }
 111     return(bfd_reloc_undefined);
 112   }
 113
 114   if ((part1_consth_active) && (r_type != R_IHCONST))
 115   {
 116     part1_consth_active = false;
 117     *error_message = (char *) "Missing IHCONST";
 118     return(bfd_reloc_dangerous);
 119   }
 120
 121
 122   sym_value = get_symbol_value(symbol_in);
 123
 124   switch (r_type)
 125   {
 126    case R_IREL:
 127     insn = bfd_get_32(abfd, hit_data);
 128     /* Take the value in the field and sign extend it */
 129     signed_value = EXTRACT_HWORD(insn);
 130     signed_value = SIGN_EXTEND_HWORD(signed_value);
 131     signed_value <<= 2;
 132     signed_value +=  sym_value + reloc_entry->addend;
 133     if (((signed_value + reloc_entry->address) & ~0x3ffff) == 0)
 134     {                           /* Absolute jmp/call */
 135       insn |= (1<<24);          /* Make it absolute */
 136       signed_value += reloc_entry->address;
 137       /* FIXME: Should we change r_type to R_IABS */
 138     }
 139     else
 140     {
 141       /* Relative jmp/call, so subtract from the value the
 142          address of the place we're coming from */
 143       signed_value -= (input_section->output_section->vma
 144                        + input_section->output_offset);
 145       if (signed_value>0x1ffff || signed_value<-0x20000)
 146        return(bfd_reloc_overflow);
 147     }
 148     signed_value >>= 2;
 149     insn = INSERT_HWORD(insn, signed_value);
 150     bfd_put_32(abfd, insn ,hit_data);
 151     break;
 152    case R_ILOHALF:
 153     insn = bfd_get_32(abfd, hit_data);
 154     unsigned_value = EXTRACT_HWORD(insn);
 155     unsigned_value +=  sym_value + reloc_entry->addend;
 156     insn = INSERT_HWORD(insn, unsigned_value);
 157     bfd_put_32(abfd, insn, hit_data);
 158     break;
 159    case R_IHIHALF:
 160     insn = bfd_get_32(abfd, hit_data);
 161     /* consth, part 1
 162        Just get the symbol value that is referenced */
 163     part1_consth_active = true;
 164     part1_consth_value = sym_value + reloc_entry->addend;
 165     /* Don't modify insn until R_IHCONST */
 166     break;
 167    case R_IHCONST:
 168     insn = bfd_get_32(abfd, hit_data);
 169     /* consth, part 2
 170        Now relocate the reference */
 171     if (part1_consth_active == false) {
 172       *error_message = (char *) "Missing IHIHALF";
 173       return(bfd_reloc_dangerous);
 174     }
 175     /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 176     unsigned_value = 0;         /*EXTRACT_HWORD(insn) << 16;*/
 177     unsigned_value += reloc_entry->addend; /* r_symndx */
 178     unsigned_value += part1_consth_value;
 179     unsigned_value = unsigned_value >> 16;
 180     insn = INSERT_HWORD(insn, unsigned_value);
 181     part1_consth_active = false;
 182     bfd_put_32(abfd, insn, hit_data);
 183     break;
 184    case R_BYTE:
 185     insn = bfd_get_8(abfd, hit_data);
 186     unsigned_value = insn + sym_value + reloc_entry->addend;
 187     if (unsigned_value & 0xffffff00) {
 188       fprintf(stderr,"Relocation problem : ");
 189       fprintf(stderr,"byte value too large in module %s\n",
 190               abfd->filename);
 191       return(bfd_reloc_overflow);
 192     }
 193     bfd_put_8(abfd, unsigned_value, hit_data);
 194     break;
 195    case R_HWORD:
 196     insn = bfd_get_16(abfd, hit_data);
 197     unsigned_value = insn + sym_value + reloc_entry->addend;
 198     if (unsigned_value & 0xffff0000) {
 199       fprintf(stderr,"Relocation problem : ");
 200       fprintf(stderr,"hword value too large in module %s\n",
 201               abfd->filename);
 202       return(bfd_reloc_overflow);
 203     }
 204
 205     bfd_put_16(abfd, insn, hit_data);
 206     break;
 207    case R_WORD:
 208     insn = bfd_get_32(abfd, hit_data);
 209     insn += sym_value + reloc_entry->addend;
 210     bfd_put_32(abfd, insn, hit_data);
 211     break;
 212    default:
 213     *error_message = "Unrecognized reloc";
 214     return (bfd_reloc_dangerous);
 215   }
 216
 217
 218   return(bfd_reloc_ok);
 219 }
 220
 221 /*      type       rightshift
 222                        size
 223                           bitsize
 224                                pc-relative
 225                                      bitpos
 226                                          absolute
 227                                              complain_on_overflow
 228                                                   special_function
 229                                                     relocation name
 230                                                                partial_inplace
 231                                                                       src_mask
 232 */
 233
 234 /*FIXME: I'm not real sure about this table */
 235 static reloc_howto_type howto_table[] =
 236 {
 237   {R_ABS,     0, 3, 32, false, 0, complain_overflow_bitfield,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 238   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 239   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 240   {21}, {22}, {23},
 241   {R_IREL,    0, 3, 32, true,  0, complain_overflow_signed,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 242   {R_IABS,    0, 3, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 243   {R_ILOHALF, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 244   {R_IHIHALF, 0, 3, 16, true,  16, complain_overflow_signed, a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 245   {R_IHCONST, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 246   {R_BYTE,    0, 0, 8, false, 0, complain_overflow_bitfield, a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 247   {R_HWORD,   0, 1, 16, false, 0, complain_overflow_bitfield, a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 248   {R_WORD,    0, 2, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 249 };
 250
 251 #define BADMAG(x) A29KBADMAG(x)
 252
 253 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 254  reloc_processing(relent, reloc, symbols, abfd, section)
 255
 256 static void
 257 reloc_processing (relent,reloc, symbols, abfd, section)
 258      arelent *relent;
 259      struct internal_reloc *reloc;
 260      asymbol **symbols;
 261      bfd *abfd;
 262      asection *section;
 263 {
 264     static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
 265
 266     relent->address = reloc->r_vaddr;
 267     relent->howto = howto_table + reloc->r_type;
 268     if (reloc->r_type == R_IHCONST)
 269     {
 270       /* The address of an R_IHCONST should always be the address of
 271          the immediately preceding R_IHIHALF.  relocs generated by gas
 272          are correct, but relocs generated by High C are different (I
 273          can't figure out what the address means for High C).  We can
 274          handle both gas and High C by ignoring the address here, and
 275          simply reusing the address saved for R_IHIHALF.  */
 276         if (ihihalf_vaddr == (bfd_vma) -1)
 277           abort ();
 278         relent->address = ihihalf_vaddr;
 279         ihihalf_vaddr = (bfd_vma) -1;
 280         relent->addend = reloc->r_symndx;
 281         relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
 282     }
 283     else
 284     {
 285       asymbol *ptr;
 286       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 287
 288       ptr = *(relent->sym_ptr_ptr);
 289
 290       if (ptr
 291           && bfd_asymbol_bfd(ptr) == abfd
 292
 293           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 294       {
 295           relent->addend = 0;
 296       }
 297       else
 298       {
 299           relent->addend = 0;
 300       }
 301       relent->address-= section->vma;
 302       if (reloc->r_type == R_IHIHALF)
 303         ihihalf_vaddr = relent->address;
 304       else if (ihihalf_vaddr != (bfd_vma) -1)
 305         abort ();
 306   }
 307 }
 308
 309 /* The reloc processing routine for the optimized COFF linker.  */
 310
 311 static boolean
 312 coff_a29k_relocate_section (output_bfd, info, input_bfd, input_section,
 313                             contents, relocs, syms, sections)
 314      bfd *output_bfd;
 315      struct bfd_link_info *info;
 316      bfd *input_bfd;
 317      asection *input_section;
 318      bfd_byte *contents;
 319      struct internal_reloc *relocs;
 320      struct internal_syment *syms;
 321      asection **sections;
 322 {
 323   struct internal_reloc *rel;
 324   struct internal_reloc *relend;
 325   boolean hihalf;
 326   bfd_vma hihalf_val;
 327
 328   /* If we are performing a relocateable link, we don't need to do a
 329      thing.  The caller will take care of adjusting the reloc
 330      addresses and symbol indices.  */
 331   if (info->relocateable)
 332     return true;
 333
 334   hihalf = false;
 335   hihalf_val = 0;
 336
 337   rel = relocs;
 338   relend = rel + input_section->reloc_count;
 339   for (; rel < relend; rel++)
 340     {
 341       long symndx;
 342       bfd_byte *loc;
 343       struct coff_link_hash_entry *h;
 344       struct internal_syment *sym;
 345       asection *sec;
 346       bfd_vma val;
 347       boolean overflow;
 348       unsigned long insn;
 349       long signed_value;
 350       unsigned long unsigned_value;
 351       bfd_reloc_status_type rstat;
 352
 353       symndx = rel->r_symndx;
 354       loc = contents + rel->r_vaddr - input_section->vma;
 355
 356       h = obj_coff_sym_hashes (input_bfd)[symndx];
 357
 358       sym = NULL;
 359       sec = NULL;
 360       val = 0;
 361
 362       /* An R_IHCONST reloc does not have a symbol.  Instead, the
 363          symbol index is an addend.  R_IHCONST is always used in
 364          conjunction with R_IHHALF.  */
 365       if (rel->r_type != R_IHCONST)
 366         {
 367           if (h == NULL)
 368             {
 369               sym = syms + symndx;
 370               sec = sections[symndx];
 371               val = (sec->output_section->vma
 372                      + sec->output_offset
 373                      + sym->n_value
 374                      - sec->vma);
 375             }
 376           else
 377             {
 378               if (h->root.type == bfd_link_hash_defined)
 379                 {
 380                   sec = h->root.u.def.section;
 381                   val = (h->root.u.def.value
 382                          + sec->output_section->vma
 383                          + sec->output_offset);
 384                 }
 385               else
 386                 {
 387                   if (! ((*info->callbacks->undefined_symbol)
 388                          (info, h->root.root.string, input_bfd, input_section,
 389                           rel->r_vaddr - input_section->vma)))
 390                     return false;
 391                 }
 392             }
 393
 394           if (hihalf)
 395             {
 396               if (! ((*info->callbacks->reloc_dangerous)
 397                      (info, "missing IHCONST reloc", input_bfd,
 398                       input_section, rel->r_vaddr - input_section->vma)))
 399                 return false;
 400               hihalf = false;
 401             }
 402         }
 403
 404       overflow = false;
 405
 406       switch (rel->r_type)
 407         {
 408         default:
 409           bfd_set_error (bfd_error_bad_value);
 410           return false;
 411
 412         case R_IREL:
 413           insn = bfd_get_32 (input_bfd, loc);
 414
 415           /* Extract the addend.  */
 416           signed_value = EXTRACT_HWORD (insn);
 417           signed_value = SIGN_EXTEND_HWORD (signed_value);
 418           signed_value <<= 2;
 419
 420           /* Determine the destination of the jump.  */
 421           signed_value += val + rel->r_vaddr - input_section->vma;
 422
 423           if ((signed_value & ~0x3ffff) == 0)
 424             {
 425               /* We can use an absolute jump.  */
 426               insn |= (1 << 24);
 427             }
 428           else
 429             {
 430               /* Make the destination PC relative.  */
 431               signed_value -= (input_section->output_section->vma
 432                                + input_section->output_offset
 433                                + (rel->r_vaddr - input_section->vma));
 434               if (signed_value > 0x1ffff || signed_value < - 0x20000)
 435                 {
 436                   overflow = true;
 437                   signed_value = 0;
 438                 }
 439             }
 440
 441           /* Put the adjusted value back into the instruction.  */
 442           signed_value >>= 2;
 443           insn = INSERT_HWORD (insn, signed_value);
 444
 445           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 446
 447           break;
 448
 449         case R_ILOHALF:
 450           insn = bfd_get_32 (input_bfd, loc);
 451           unsigned_value = EXTRACT_HWORD (insn);
 452           unsigned_value += val;
 453           insn = INSERT_HWORD (insn, unsigned_value);
 454           bfd_put_32 (input_bfd, insn, loc);
 455           break;
 456
 457         case R_IHIHALF:
 458           /* Save the value for the R_IHCONST reloc.  */
 459           hihalf = true;
 460           hihalf_val = val;
 461           break;
 462
 463         case R_IHCONST:
 464           if (! hihalf)
 465             {
 466               if (! ((*info->callbacks->reloc_dangerous)
 467                      (info, "missing IHIHALF reloc", input_bfd,
 468                       input_section, rel->r_vaddr - input_section->vma)))
 469                 return false;
 470               hihalf_val = 0;
 471             }
 472
 473           insn = bfd_get_32 (input_bfd, loc);
 474           unsigned_value = rel->r_symndx + hihalf_val;
 475           unsigned_value >>= 16;
 476           insn = INSERT_HWORD (insn, unsigned_value);
 477           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 478
 479           hihalf = false;
 480
 481           break;
 482
 483         case R_BYTE:
 484         case R_HWORD:
 485         case R_WORD:
 486           rstat = _bfd_relocate_contents (howto_table + rel->r_type,
 487                                           input_bfd, val, loc);
 488           if (rstat == bfd_reloc_overflow)
 489             overflow = true;
 490           else if (rstat != bfd_reloc_ok)
 491             abort ();
 492           break;
 493         }
 494
 495       if (overflow)
 496         {
 497           const char *name;
 498           char buf[SYMNMLEN + 1];
 499
 500           if (h != NULL)
 501             name = h->root.root.string;
 502           else if (sym == NULL)
 503             name = "*unknown*";
 504           else if (sym->_n._n_n._n_zeroes == 0
 505                    && sym->_n._n_n._n_offset != 0)
 506             name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
 507           else
 508             {
 509               strncpy (buf, sym->_n._n_name, SYMNMLEN);
 510               buf[SYMNMLEN] = '\0';
 511               name = buf;
 512             }
 513
 514           if (! ((*info->callbacks->reloc_overflow)
 515                  (info, name, howto_table[rel->r_type].name, (bfd_vma) 0,
 516                   input_bfd, input_section,
 517                   rel->r_vaddr - input_section->vma)))
 518             return false;
 519         }
 520     }
 521
 522   return true;
 523 }
 524
 525 #define coff_relocate_section coff_a29k_relocate_section
 526
 527 #include "coffcode.h"
 528
 529 const bfd_target a29kcoff_big_vec =
 530 {
 531   "coff-a29k-big",              /* name */
 532   bfd_target_coff_flavour,
 533   true,                         /* data byte order is big */
 534   true,                         /* header byte order is big */
 535
 536   (HAS_RELOC | EXEC_P |         /* object flags */
 537    HAS_LINENO | HAS_DEBUG |
 538    HAS_SYMS | HAS_LOCALS | WP_TEXT),
 539
 540   (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 541    | SEC_LOAD | SEC_RELOC
 542    | SEC_READONLY ),
 543   '_',                          /* leading underscore */
 544   '/',                          /* ar_pad_char */
 545   15,                           /* ar_max_namelen */
 546   2,                            /* minimum section alignment */
 547   /* data */
 548   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 549      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 550      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 551   /* hdrs */
 552   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 553      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 554      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 555
 556  {
 557
 558    _bfd_dummy_target,
 559    coff_object_p,
 560    bfd_generic_archive_p,
 561    _bfd_dummy_target
 562   },
 563  {
 564    bfd_false,
 565    coff_mkobject,
 566    _bfd_generic_mkarchive,
 567    bfd_false
 568   },
 569  {
 570    bfd_false,
 571    coff_write_object_contents,
 572    _bfd_write_archive_contents,
 573    bfd_false
 574   },
 575
 576      BFD_JUMP_TABLE_GENERIC (coff),
 577      BFD_JUMP_TABLE_COPY (coff),
 578      BFD_JUMP_TABLE_CORE (_bfd_nocore),
 579      BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 580      BFD_JUMP_TABLE_SYMBOLS (coff),
 581      BFD_JUMP_TABLE_RELOCS (coff),
 582      BFD_JUMP_TABLE_WRITE (coff),
 583      BFD_JUMP_TABLE_LINK (coff),
 584      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 585
 586   COFF_SWAP_TABLE
 587  };