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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 static boolean coff_a29k_adjust_symndx
  38   PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
  39            struct internal_reloc *, boolean *));
  40
  41 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
  42
  43 #define INSERT_HWORD(WORD,HWORD)        \
  44     (((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))
  45 #define EXTRACT_HWORD(WORD) \
  46     ((((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff))
  47 #define SIGN_EXTEND_HWORD(HWORD) \
  48     ((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD))
  49
  50 /* Provided the symbol, returns the value reffed */
  51 static long
  52 get_symbol_value (symbol)
  53      asymbol *symbol;
  54 {
  55   long relocation = 0;
  56
  57   if (bfd_is_com_section (symbol->section))
  58   {
  59     relocation = 0;
  60   }
  61   else
  62   {
  63     relocation = symbol->value +
  64      symbol->section->output_section->vma +
  65       symbol->section->output_offset;
  66   }
  67
  68   return(relocation);
  69 }
  70
  71 /* this function is in charge of performing all the 29k relocations */
  72
  73 static bfd_reloc_status_type
  74 a29k_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
  75             error_message)
  76      bfd *abfd;
  77      arelent *reloc_entry;
  78      asymbol *symbol_in;
  79      PTR data;
  80      asection *input_section;
  81      bfd *output_bfd;
  82      char **error_message;
  83 {
  84   /* the consth relocation comes in two parts, we have to remember
  85      the state between calls, in these variables */
  86   static boolean part1_consth_active = false;
  87   static unsigned long part1_consth_value;
  88
  89   unsigned long insn;
  90   unsigned long sym_value;
  91   unsigned long unsigned_value;
  92   unsigned short r_type;
  93   long signed_value;
  94
  95   unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
  96   bfd_byte  *hit_data =addr + (bfd_byte *)(data);
  97
  98   r_type = reloc_entry->howto->type;
  99
 100   if (output_bfd) {
 101     /* Partial linking - do nothing */
 102     reloc_entry->address += input_section->output_offset;
 103     return bfd_reloc_ok;
 104
 105   }
 106
 107   if (symbol_in != NULL
 108       && bfd_is_und_section (symbol_in->section))
 109   {
 110     /* Keep the state machine happy in case we're called again */
 111     if (r_type == R_IHIHALF)
 112     {
 113       part1_consth_active = true;
 114       part1_consth_value  = 0;
 115     }
 116     return(bfd_reloc_undefined);
 117   }
 118
 119   if ((part1_consth_active) && (r_type != R_IHCONST))
 120   {
 121     part1_consth_active = false;
 122     *error_message = (char *) "Missing IHCONST";
 123     return(bfd_reloc_dangerous);
 124   }
 125
 126
 127   sym_value = get_symbol_value(symbol_in);
 128
 129   switch (r_type)
 130   {
 131    case R_IREL:
 132     insn = bfd_get_32(abfd, hit_data);
 133     /* Take the value in the field and sign extend it */
 134     signed_value = EXTRACT_HWORD(insn);
 135     signed_value = SIGN_EXTEND_HWORD(signed_value);
 136     signed_value <<= 2;
 137     signed_value +=  sym_value + reloc_entry->addend;
 138     if (((signed_value + reloc_entry->address) & ~0x3ffff) == 0)
 139     {                           /* Absolute jmp/call */
 140       insn |= (1<<24);          /* Make it absolute */
 141       signed_value += reloc_entry->address;
 142       /* FIXME: Should we change r_type to R_IABS */
 143     }
 144     else
 145     {
 146       /* Relative jmp/call, so subtract from the value the
 147          address of the place we're coming from */
 148       signed_value -= (input_section->output_section->vma
 149                        + input_section->output_offset);
 150       if (signed_value>0x1ffff || signed_value<-0x20000)
 151        return(bfd_reloc_overflow);
 152     }
 153     signed_value >>= 2;
 154     insn = INSERT_HWORD(insn, signed_value);
 155     bfd_put_32(abfd, insn ,hit_data);
 156     break;
 157    case R_ILOHALF:
 158     insn = bfd_get_32(abfd, hit_data);
 159     unsigned_value = EXTRACT_HWORD(insn);
 160     unsigned_value +=  sym_value + reloc_entry->addend;
 161     insn = INSERT_HWORD(insn, unsigned_value);
 162     bfd_put_32(abfd, insn, hit_data);
 163     break;
 164    case R_IHIHALF:
 165     insn = bfd_get_32(abfd, hit_data);
 166     /* consth, part 1
 167        Just get the symbol value that is referenced */
 168     part1_consth_active = true;
 169     part1_consth_value = sym_value + reloc_entry->addend;
 170     /* Don't modify insn until R_IHCONST */
 171     break;
 172    case R_IHCONST:
 173     insn = bfd_get_32(abfd, hit_data);
 174     /* consth, part 2
 175        Now relocate the reference */
 176     if (part1_consth_active == false) {
 177       *error_message = (char *) "Missing IHIHALF";
 178       return(bfd_reloc_dangerous);
 179     }
 180     /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
 181     unsigned_value = 0;         /*EXTRACT_HWORD(insn) << 16;*/
 182     unsigned_value += reloc_entry->addend; /* r_symndx */
 183     unsigned_value += part1_consth_value;
 184     unsigned_value = unsigned_value >> 16;
 185     insn = INSERT_HWORD(insn, unsigned_value);
 186     part1_consth_active = false;
 187     bfd_put_32(abfd, insn, hit_data);
 188     break;
 189    case R_BYTE:
 190     insn = bfd_get_8(abfd, hit_data);
 191     unsigned_value = insn + sym_value + reloc_entry->addend;
 192     if (unsigned_value & 0xffffff00)
 193       return(bfd_reloc_overflow);
 194     bfd_put_8(abfd, unsigned_value, hit_data);
 195     break;
 196    case R_HWORD:
 197     insn = bfd_get_16(abfd, hit_data);
 198     unsigned_value = insn + sym_value + reloc_entry->addend;
 199     if (unsigned_value & 0xffff0000)
 200       return(bfd_reloc_overflow);
 201     bfd_put_16(abfd, insn, hit_data);
 202     break;
 203    case R_WORD:
 204     insn = bfd_get_32(abfd, hit_data);
 205     insn += sym_value + reloc_entry->addend;
 206     bfd_put_32(abfd, insn, hit_data);
 207     break;
 208    default:
 209     *error_message = "Unrecognized reloc";
 210     return (bfd_reloc_dangerous);
 211   }
 212
 213
 214   return(bfd_reloc_ok);
 215 }
 216
 217 /*      type       rightshift
 218                        size
 219                           bitsize
 220                                pc-relative
 221                                      bitpos
 222                                          absolute
 223                                              complain_on_overflow
 224                                                   special_function
 225                                                     relocation name
 226                                                                partial_inplace
 227                                                                       src_mask
 228 */
 229
 230 /*FIXME: I'm not real sure about this table */
 231 static reloc_howto_type howto_table[] =
 232 {
 233   {R_ABS,     0, 3, 32, false, 0, complain_overflow_bitfield,a29k_reloc,"ABS",     true, 0xffffffff,0xffffffff, false},
 234   {1},  {2},  {3},   {4},  {5},  {6},  {7},  {8},  {9}, {10},
 235   {11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
 236   {21}, {22}, {23},
 237   {R_IREL,    0, 3, 32, true,  0, complain_overflow_signed,a29k_reloc,"IREL",    true, 0xffffffff,0xffffffff, false},
 238   {R_IABS,    0, 3, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"IABS",    true, 0xffffffff,0xffffffff, false},
 239   {R_ILOHALF, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
 240   {R_IHIHALF, 0, 3, 16, true,  16, complain_overflow_signed, a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
 241   {R_IHCONST, 0, 3, 16, true,  0, complain_overflow_signed, a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
 242   {R_BYTE,    0, 0, 8, false, 0, complain_overflow_bitfield, a29k_reloc,"BYTE",    true, 0x000000ff,0x000000ff, false},
 243   {R_HWORD,   0, 1, 16, false, 0, complain_overflow_bitfield, a29k_reloc,"HWORD",   true, 0x0000ffff,0x0000ffff, false},
 244   {R_WORD,    0, 2, 32, false, 0, complain_overflow_bitfield, a29k_reloc,"WORD",    true, 0xffffffff,0xffffffff, false},
 245 };
 246
 247 #define BADMAG(x) A29KBADMAG(x)
 248
 249 #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
 250  reloc_processing(relent, reloc, symbols, abfd, section)
 251
 252 static void
 253 reloc_processing (relent,reloc, symbols, abfd, section)
 254      arelent *relent;
 255      struct internal_reloc *reloc;
 256      asymbol **symbols;
 257      bfd *abfd;
 258      asection *section;
 259 {
 260     static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
 261
 262     relent->address = reloc->r_vaddr;
 263     relent->howto = howto_table + reloc->r_type;
 264     if (reloc->r_type == R_IHCONST)
 265     {
 266       /* The address of an R_IHCONST should always be the address of
 267          the immediately preceding R_IHIHALF.  relocs generated by gas
 268          are correct, but relocs generated by High C are different (I
 269          can't figure out what the address means for High C).  We can
 270          handle both gas and High C by ignoring the address here, and
 271          simply reusing the address saved for R_IHIHALF.  */
 272         if (ihihalf_vaddr == (bfd_vma) -1)
 273           abort ();
 274         relent->address = ihihalf_vaddr;
 275         ihihalf_vaddr = (bfd_vma) -1;
 276         relent->addend = reloc->r_symndx;
 277         relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
 278     }
 279     else
 280     {
 281       asymbol *ptr;
 282       relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
 283
 284       ptr = *(relent->sym_ptr_ptr);
 285
 286       if (ptr
 287           && bfd_asymbol_bfd(ptr) == abfd
 288
 289           && ((ptr->flags & BSF_OLD_COMMON)== 0))
 290       {
 291           relent->addend = 0;
 292       }
 293       else
 294       {
 295           relent->addend = 0;
 296       }
 297       relent->address-= section->vma;
 298       if (reloc->r_type == R_IHIHALF)
 299         ihihalf_vaddr = relent->address;
 300       else if (ihihalf_vaddr != (bfd_vma) -1)
 301         abort ();
 302   }
 303 }
 304
 305 /* The reloc processing routine for the optimized COFF linker.  */
 306
 307 static boolean
 308 coff_a29k_relocate_section (output_bfd, info, input_bfd, input_section,
 309                             contents, relocs, syms, sections)
 310      bfd *output_bfd;
 311      struct bfd_link_info *info;
 312      bfd *input_bfd;
 313      asection *input_section;
 314      bfd_byte *contents;
 315      struct internal_reloc *relocs;
 316      struct internal_syment *syms;
 317      asection **sections;
 318 {
 319   struct internal_reloc *rel;
 320   struct internal_reloc *relend;
 321   boolean hihalf;
 322   bfd_vma hihalf_val;
 323
 324   /* If we are performing a relocateable link, we don't need to do a
 325      thing.  The caller will take care of adjusting the reloc
 326      addresses and symbol indices.  */
 327   if (info->relocateable)
 328     return true;
 329
 330   hihalf = false;
 331   hihalf_val = 0;
 332
 333   rel = relocs;
 334   relend = rel + input_section->reloc_count;
 335   for (; rel < relend; rel++)
 336     {
 337       long symndx;
 338       bfd_byte *loc;
 339       struct coff_link_hash_entry *h;
 340       struct internal_syment *sym;
 341       asection *sec;
 342       bfd_vma val;
 343       boolean overflow;
 344       unsigned long insn;
 345       long signed_value;
 346       unsigned long unsigned_value;
 347       bfd_reloc_status_type rstat;
 348
 349       symndx = rel->r_symndx;
 350       loc = contents + rel->r_vaddr - input_section->vma;
 351
 352       if (symndx == -1)
 353         h = NULL;
 354       else
 355         h = obj_coff_sym_hashes (input_bfd)[symndx];
 356
 357       sym = NULL;
 358       sec = NULL;
 359       val = 0;
 360
 361       /* An R_IHCONST reloc does not have a symbol.  Instead, the
 362          symbol index is an addend.  R_IHCONST is always used in
 363          conjunction with R_IHHALF.  */
 364       if (rel->r_type != R_IHCONST)
 365         {
 366           if (h == NULL)
 367             {
 368               if (symndx == -1)
 369                 sec = bfd_abs_section_ptr;
 370               else
 371                 {
 372                   sym = syms + symndx;
 373                   sec = sections[symndx];
 374                   val = (sec->output_section->vma
 375                          + sec->output_offset
 376                          + sym->n_value
 377                          - sec->vma);
 378                 }
 379             }
 380           else
 381             {
 382               if (h->root.type == bfd_link_hash_defined
 383                   || h->root.type == bfd_link_hash_defweak)
 384                 {
 385                   sec = h->root.u.def.section;
 386                   val = (h->root.u.def.value
 387                          + sec->output_section->vma
 388                          + sec->output_offset);
 389                 }
 390               else
 391                 {
 392                   if (! ((*info->callbacks->undefined_symbol)
 393                          (info, h->root.root.string, input_bfd, input_section,
 394                           rel->r_vaddr - input_section->vma)))
 395                     return false;
 396                 }
 397             }
 398
 399           if (hihalf)
 400             {
 401               if (! ((*info->callbacks->reloc_dangerous)
 402                      (info, "missing IHCONST reloc", input_bfd,
 403                       input_section, rel->r_vaddr - input_section->vma)))
 404                 return false;
 405               hihalf = false;
 406             }
 407         }
 408
 409       overflow = false;
 410
 411       switch (rel->r_type)
 412         {
 413         default:
 414           bfd_set_error (bfd_error_bad_value);
 415           return false;
 416
 417         case R_IREL:
 418           insn = bfd_get_32 (input_bfd, loc);
 419
 420           /* Extract the addend.  */
 421           signed_value = EXTRACT_HWORD (insn);
 422           signed_value = SIGN_EXTEND_HWORD (signed_value);
 423           signed_value <<= 2;
 424
 425           /* Determine the destination of the jump.  */
 426           signed_value += val + rel->r_vaddr - input_section->vma;
 427
 428           if ((signed_value & ~0x3ffff) == 0)
 429             {
 430               /* We can use an absolute jump.  */
 431               insn |= (1 << 24);
 432             }
 433           else
 434             {
 435               /* Make the destination PC relative.  */
 436               signed_value -= (input_section->output_section->vma
 437                                + input_section->output_offset
 438                                + (rel->r_vaddr - input_section->vma));
 439               if (signed_value > 0x1ffff || signed_value < - 0x20000)
 440                 {
 441                   overflow = true;
 442                   signed_value = 0;
 443                 }
 444             }
 445
 446           /* Put the adjusted value back into the instruction.  */
 447           signed_value >>= 2;
 448           insn = INSERT_HWORD (insn, signed_value);
 449
 450           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 451
 452           break;
 453
 454         case R_ILOHALF:
 455           insn = bfd_get_32 (input_bfd, loc);
 456           unsigned_value = EXTRACT_HWORD (insn);
 457           unsigned_value += val;
 458           insn = INSERT_HWORD (insn, unsigned_value);
 459           bfd_put_32 (input_bfd, insn, loc);
 460           break;
 461
 462         case R_IHIHALF:
 463           /* Save the value for the R_IHCONST reloc.  */
 464           hihalf = true;
 465           hihalf_val = val;
 466           break;
 467
 468         case R_IHCONST:
 469           if (! hihalf)
 470             {
 471               if (! ((*info->callbacks->reloc_dangerous)
 472                      (info, "missing IHIHALF reloc", input_bfd,
 473                       input_section, rel->r_vaddr - input_section->vma)))
 474                 return false;
 475               hihalf_val = 0;
 476             }
 477
 478           insn = bfd_get_32 (input_bfd, loc);
 479           unsigned_value = rel->r_symndx + hihalf_val;
 480           unsigned_value >>= 16;
 481           insn = INSERT_HWORD (insn, unsigned_value);
 482           bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
 483
 484           hihalf = false;
 485
 486           break;
 487
 488         case R_BYTE:
 489         case R_HWORD:
 490         case R_WORD:
 491           rstat = _bfd_relocate_contents (howto_table + rel->r_type,
 492                                           input_bfd, val, loc);
 493           if (rstat == bfd_reloc_overflow)
 494             overflow = true;
 495           else if (rstat != bfd_reloc_ok)
 496             abort ();
 497           break;
 498         }
 499
 500       if (overflow)
 501         {
 502           const char *name;
 503           char buf[SYMNMLEN + 1];
 504
 505           if (symndx == -1)
 506             name = "*ABS*";
 507           else if (h != NULL)
 508             name = h->root.root.string;
 509           else if (sym == NULL)
 510             name = "*unknown*";
 511           else if (sym->_n._n_n._n_zeroes == 0
 512                    && sym->_n._n_n._n_offset != 0)
 513             name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
 514           else
 515             {
 516               strncpy (buf, sym->_n._n_name, SYMNMLEN);
 517               buf[SYMNMLEN] = '\0';
 518               name = buf;
 519             }
 520
 521           if (! ((*info->callbacks->reloc_overflow)
 522                  (info, name, howto_table[rel->r_type].name, (bfd_vma) 0,
 523                   input_bfd, input_section,
 524                   rel->r_vaddr - input_section->vma)))
 525             return false;
 526         }
 527     }
 528
 529   return true;
 530 }
 531
 532 #define coff_relocate_section coff_a29k_relocate_section
 533
 534 /* We don't want to change the symndx of a R_IHCONST reloc, since it
 535    is actually an addend, not a symbol index at all.  */
 536
 537 /*ARGSUSED*/
 538 static boolean
 539 coff_a29k_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
 540      bfd *obfd;
 541      struct bfd_link_info *info;
 542      bfd *ibfd;
 543      asection *sec;
 544      struct internal_reloc *irel;
 545      boolean *adjustedp;
 546 {
 547   if (irel->r_type == R_IHCONST)
 548     *adjustedp = true;
 549   else
 550     *adjustedp = false;
 551   return true;
 552 }
 553
 554 #define coff_adjust_symndx coff_a29k_adjust_symndx
 555
 556 #include "coffcode.h"
 557
 558 const bfd_target a29kcoff_big_vec =
 559 {
 560   "coff-a29k-big",              /* name */
 561   bfd_target_coff_flavour,
 562   true,                         /* data byte order is big */
 563   true,                         /* header byte order is big */
 564
 565   (HAS_RELOC | EXEC_P |         /* object flags */
 566    HAS_LINENO | HAS_DEBUG |
 567    HAS_SYMS | HAS_LOCALS | WP_TEXT),
 568
 569   (SEC_HAS_CONTENTS | SEC_ALLOC /* section flags */
 570    | SEC_LOAD | SEC_RELOC
 571    | SEC_READONLY ),
 572   '_',                          /* leading underscore */
 573   '/',                          /* ar_pad_char */
 574   15,                           /* ar_max_namelen */
 575   /* data */
 576   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 577      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 578      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 579   /* hdrs */
 580   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 581      bfd_getb32, bfd_getb_signed_32,   bfd_putb32,
 582      bfd_getb16, bfd_getb_signed_16, bfd_putb16,
 583
 584  {
 585
 586    _bfd_dummy_target,
 587    coff_object_p,
 588    bfd_generic_archive_p,
 589    _bfd_dummy_target
 590   },
 591  {
 592    bfd_false,
 593    coff_mkobject,
 594    _bfd_generic_mkarchive,
 595    bfd_false
 596   },
 597  {
 598    bfd_false,
 599    coff_write_object_contents,
 600    _bfd_write_archive_contents,
 601    bfd_false
 602   },
 603
 604      BFD_JUMP_TABLE_GENERIC (coff),
 605      BFD_JUMP_TABLE_COPY (coff),
 606      BFD_JUMP_TABLE_CORE (_bfd_nocore),
 607      BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
 608      BFD_JUMP_TABLE_SYMBOLS (coff),
 609      BFD_JUMP_TABLE_RELOCS (coff),
 610      BFD_JUMP_TABLE_WRITE (coff),
 611      BFD_JUMP_TABLE_LINK (coff),
 612      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 613
 614   COFF_SWAP_TABLE
 615  };