bfd/coff-mcore.c

   1 /* BFD back-end for Motorola MCore COFF/PE
   2    Copyright 1999, 2000, 2001, 2002, 2003, 2004
   3    Free Software Foundation, Inc.
   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, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "coff/mcore.h"
  26 #include "coff/internal.h"
  27 #include "coff/pe.h"
  28 #include "libcoff.h"
  29
  30 #ifdef BADMAG
  31 #undef BADMAG
  32 #endif
  33 #define BADMAG(x) MCOREBADMAG(x)
  34
  35 #ifndef NUM_ELEM
  36 #define NUM_ELEM(A) (sizeof (A) / sizeof (A)[0])
  37 #endif
  38
  39 /* This file is compiled more than once, but we only compile the
  40    final_link routine once.  */
  41 extern bfd_boolean mcore_bfd_coff_final_link
  42   PARAMS ((bfd *, struct bfd_link_info *));
  43 static bfd_reloc_status_type mcore_coff_unsupported_reloc
  44   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  45 static bfd_boolean coff_mcore_relocate_section
  46   PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
  47            struct internal_reloc *, struct internal_syment *, asection **));
  48 static reloc_howto_type *mcore_coff_reloc_type_lookup
  49   PARAMS ((bfd *, bfd_reloc_code_real_type));
  50 static reloc_howto_type *coff_mcore_rtype_to_howto
  51   PARAMS ((bfd *, asection *, struct internal_reloc *,
  52            struct coff_link_hash_entry *, struct internal_syment *,
  53            bfd_vma *));
  54 static void mcore_emit_base_file_entry
  55   PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
  56 static bfd_boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
  57 \f
  58 /* The NT loader points the toc register to &toc + 32768, in order to
  59    use the complete range of a 16-bit displacement. We have to adjust
  60    for this when we fix up loads displaced off the toc reg.  */
  61 #define TOC_LOAD_ADJUSTMENT (-32768)
  62 #define TOC_SECTION_NAME ".private.toc"
  63
  64 /* The main body of code is in coffcode.h.  */
  65 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
  66
  67 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
  68    from smaller values.  Start with zero, widen, *then* decrement.  */
  69 #define MINUS_ONE       (((bfd_vma)0) - 1)
  70 \f
  71 static reloc_howto_type mcore_coff_howto_table[] =
  72 {
  73   /* Unused: */
  74   HOWTO (IMAGE_REL_MCORE_ABSOLUTE,/* type */
  75          0,                      /* rightshift */
  76          0,                      /* size (0 = byte, 1 = short, 2 = long) */
  77          0,                      /* bitsize */
  78          FALSE,                  /* pc_relative */
  79          0,                      /* bitpos */
  80          complain_overflow_dont, /* dont complain_on_overflow */
  81          NULL,                   /* special_function */
  82          "ABSOLUTE",             /* name */
  83          FALSE,                  /* partial_inplace */
  84          0x00,                   /* src_mask */
  85          0x00,                   /* dst_mask */
  86          FALSE),                 /* pcrel_offset */
  87
  88   HOWTO (IMAGE_REL_MCORE_ADDR32,/* type */
  89          0,                     /* rightshift */
  90          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  91          32,                    /* bitsize */
  92          FALSE,                 /* pc_relative */
  93          0,                     /* bitpos */
  94          complain_overflow_bitfield, /* complain_on_overflow */
  95          NULL,                  /* special_function */
  96          "ADDR32",              /* name */
  97          TRUE,                  /* partial_inplace */
  98          0xffffffff,            /* src_mask */
  99          0xffffffff,            /* dst_mask */
 100          FALSE),                /* pcrel_offset */
 101
 102   /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
 103      Should not appear in object files.  */
 104   HOWTO (IMAGE_REL_MCORE_PCREL_IMM8BY4, /* type */
 105          2,                     /* rightshift */
 106          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 107          8,                     /* bitsize */
 108          TRUE,                  /* pc_relative */
 109          0,                     /* bitpos */
 110          complain_overflow_bitfield, /* complain_on_overflow */
 111          mcore_coff_unsupported_reloc, /* special_function */
 112          "IMM8BY4",             /* name */
 113          FALSE,                 /* partial_inplace */
 114          0,                     /* src_mask */
 115          0,                     /* dst_mask */
 116          TRUE),                 /* pcrel_offset */
 117
 118   /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
 119      Span 2k instructions == 4k bytes.
 120      Only useful pieces at the relocated address are the opcode (5 bits) */
 121   HOWTO (IMAGE_REL_MCORE_PCREL_IMM11BY2,/* type */
 122          1,                     /* rightshift */
 123          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 124          11,                    /* bitsize */
 125          TRUE,                  /* pc_relative */
 126          0,                     /* bitpos */
 127          complain_overflow_signed, /* complain_on_overflow */
 128          NULL,                  /* special_function */
 129          "IMM11BY2",            /* name */
 130          FALSE,                 /* partial_inplace */
 131          0x0,                   /* src_mask */
 132          0x7ff,                 /* dst_mask */
 133          TRUE),                 /* pcrel_offset */
 134
 135   /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported.  */
 136   HOWTO (IMAGE_REL_MCORE_PCREL_IMM4BY2, /* type */
 137          1,                     /* rightshift */
 138          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 139          4,                     /* bitsize */
 140          TRUE,                  /* pc_relative */
 141          0,                     /* bitpos */
 142          complain_overflow_bitfield, /* complain_on_overflow */
 143          mcore_coff_unsupported_reloc, /* special_function */
 144          "IMM4BY2",              /* name */
 145          FALSE,                 /* partial_inplace */
 146          0,                     /* src_mask */
 147          0,                     /* dst_mask */
 148          TRUE),                 /* pcrel_offset */
 149
 150   /* 32-bit pc-relative. Eventually this will help support PIC code.  */
 151   HOWTO (IMAGE_REL_MCORE_PCREL_32,/* type */
 152          0,                     /* rightshift */
 153          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 154          32,                    /* bitsize */
 155          TRUE,                  /* pc_relative */
 156          0,                     /* bitpos */
 157          complain_overflow_bitfield, /* complain_on_overflow */
 158          NULL,                  /* special_function */
 159          "PCREL_32",            /* name */
 160          FALSE,                 /* partial_inplace */
 161          0x0,                   /* src_mask */
 162          0xffffffff,            /* dst_mask */
 163          TRUE),                 /* pcrel_offset */
 164
 165   /* Like PCREL_IMM11BY2, this relocation indicates that there is a
 166      'jsri' at the specified address. There is a separate relocation
 167      entry for the literal pool entry that it references, but we
 168      might be able to change the jsri to a bsr if the target turns out
 169      to be close enough [even though we won't reclaim the literal pool
 170      entry, we'll get some runtime efficiency back]. Note that this
 171      is a relocation that we are allowed to safely ignore.  */
 172   HOWTO (IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2,/* type */
 173          1,                     /* rightshift */
 174          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 175          11,                    /* bitsize */
 176          TRUE,                  /* pc_relative */
 177          0,                     /* bitpos */
 178          complain_overflow_signed, /* complain_on_overflow */
 179          NULL,                  /* special_function */
 180          "JSR_IMM11BY2",        /* name */
 181          FALSE,                 /* partial_inplace */
 182          0x0,                   /* src_mask */
 183          0x7ff,                 /* dst_mask */
 184          TRUE),                 /* pcrel_offset */
 185
 186   HOWTO (IMAGE_REL_MCORE_RVA,   /* type */
 187          0,                     /* rightshift */
 188          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 189          32,                    /* bitsize */
 190          FALSE,                 /* pc_relative */
 191          0,                     /* bitpos */
 192          complain_overflow_signed, /* complain_on_overflow */
 193          NULL,                  /* special_function */
 194          "MCORE_RVA",           /* name */
 195          TRUE,                  /* partial_inplace */
 196          0xffffffff,            /* src_mask */
 197          0xffffffff,            /* dst_mask */
 198          TRUE)                  /* pcrel_offset */
 199 };
 200 \f
 201 /* Extend the coff_link_hash_table structure with a few M*Core specific fields.
 202    This allows us to store global data here without actually creating any
 203    global variables, which is a no-no in the BFD world.  */
 204 typedef struct coff_mcore_link_hash_table
 205 {
 206   /* The original coff_link_hash_table structure.  MUST be first field.  */
 207   struct coff_link_hash_table   root;
 208
 209   bfd *                         bfd_of_toc_owner;
 210   long int                      global_toc_size;
 211   long int                      import_table_size;
 212   long int                      first_thunk_address;
 213   long int                      thunk_size;
 214 }
 215 mcore_hash_table;
 216
 217 /* Get the MCore coff linker hash table from a link_info structure.  */
 218 #define coff_mcore_hash_table(info) \
 219   ((mcore_hash_table *) ((info)->hash))
 220
 221 \f
 222 /* Add an entry to the base file.  */
 223
 224 static void
 225 mcore_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
 226       struct bfd_link_info * info;
 227       bfd *                  output_bfd;
 228       asection *             input_section;
 229       bfd_vma                reloc_offset;
 230 {
 231   bfd_vma addr = reloc_offset
 232                  - input_section->vma
 233                  + input_section->output_offset
 234                  + input_section->output_section->vma;
 235
 236   if (coff_data (output_bfd)->pe)
 237      addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
 238
 239   fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
 240 }
 241 \f
 242 static bfd_reloc_status_type
 243 mcore_coff_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
 244                            output_bfd, error_message)
 245      bfd * abfd;
 246      arelent * reloc_entry;
 247      asymbol * symbol ATTRIBUTE_UNUSED;
 248      PTR data ATTRIBUTE_UNUSED;
 249      asection * input_section ATTRIBUTE_UNUSED;
 250      bfd * output_bfd ATTRIBUTE_UNUSED;
 251      char ** error_message ATTRIBUTE_UNUSED;
 252 {
 253   BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
 254
 255   _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
 256                       abfd,
 257                       reloc_entry->howto->name,
 258                       reloc_entry->howto->type);
 259
 260   return bfd_reloc_notsupported;
 261 }
 262 \f
 263 /* A cheesy little macro to make the code a little more readable.  */
 264 #define HOW2MAP(bfd_rtype, mcore_rtype)  \
 265  case bfd_rtype: return & mcore_coff_howto_table [mcore_rtype]
 266
 267 static reloc_howto_type *
 268 mcore_coff_reloc_type_lookup (abfd, code)
 269      bfd * abfd ATTRIBUTE_UNUSED;
 270      bfd_reloc_code_real_type code;
 271 {
 272   switch (code)
 273     {
 274       HOW2MAP (BFD_RELOC_32,                       IMAGE_REL_MCORE_ADDR32);
 275       HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM8BY4,      IMAGE_REL_MCORE_PCREL_IMM8BY4);
 276       HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM11BY2,     IMAGE_REL_MCORE_PCREL_IMM11BY2);
 277       HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM4BY2,      IMAGE_REL_MCORE_PCREL_IMM4BY2);
 278       HOW2MAP (BFD_RELOC_32_PCREL,                 IMAGE_REL_MCORE_PCREL_32);
 279       HOW2MAP (BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2, IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2);
 280       HOW2MAP (BFD_RELOC_RVA,                      IMAGE_REL_MCORE_RVA);
 281    default:
 282       return NULL;
 283     }
 284   /*NOTREACHED*/
 285 }
 286
 287 #undef HOW2MAP
 288
 289 #define RTYPE2HOWTO(cache_ptr, dst) \
 290   (cache_ptr)->howto = mcore_coff_howto_table + (dst)->r_type;
 291
 292 static reloc_howto_type *
 293 coff_mcore_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
 294      bfd * abfd ATTRIBUTE_UNUSED;
 295      asection * sec;
 296      struct internal_reloc * rel;
 297      struct coff_link_hash_entry * h ATTRIBUTE_UNUSED;
 298      struct internal_syment * sym;
 299      bfd_vma * addendp;
 300 {
 301   reloc_howto_type * howto;
 302
 303   if (rel->r_type >= NUM_ELEM (mcore_coff_howto_table))
 304     return NULL;
 305
 306   howto = mcore_coff_howto_table + rel->r_type;
 307
 308   if (rel->r_type == IMAGE_REL_MCORE_RVA)
 309     * addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
 310
 311   else if (howto->pc_relative)
 312     {
 313       * addendp = sec->vma - 2; /* XXX guess - is this right ? */
 314
 315       /* If the symbol is defined, then the generic code is going to
 316          add back the symbol value in order to cancel out an
 317          adjustment it made to the addend.  However, we set the addend
 318          to 0 at the start of this function.  We need to adjust here,
 319          to avoid the adjustment the generic code will make.  FIXME:
 320          This is getting a bit hackish.  */
 321       if (sym != NULL && sym->n_scnum != 0)
 322         * addendp -= sym->n_value;
 323     }
 324   else
 325     * addendp = 0;
 326
 327   return howto;
 328 }
 329
 330 /* Return TRUE if this relocation should appear in the output .reloc section.
 331    This function is referenced in pe_mkobject in peicode.h.  */
 332
 333 static bfd_boolean
 334 in_reloc_p (abfd, howto)
 335      bfd * abfd ATTRIBUTE_UNUSED;
 336      reloc_howto_type * howto;
 337 {
 338   return ! howto->pc_relative && howto->type != IMAGE_REL_MCORE_RVA;
 339 }
 340 \f
 341 /* The reloc processing routine for the optimized COFF linker.  */
 342 static bfd_boolean
 343 coff_mcore_relocate_section (output_bfd, info, input_bfd, input_section,
 344                            contents, relocs, syms, sections)
 345      bfd * output_bfd;
 346      struct bfd_link_info * info;
 347      bfd * input_bfd;
 348      asection * input_section;
 349      bfd_byte * contents;
 350      struct internal_reloc * relocs;
 351      struct internal_syment * syms;
 352      asection ** sections;
 353 {
 354   struct internal_reloc * rel;
 355   struct internal_reloc * relend;
 356   bfd_boolean hihalf;
 357   bfd_vma hihalf_val;
 358
 359   /* If we are performing a relocatable link, we don't need to do a
 360      thing.  The caller will take care of adjusting the reloc
 361      addresses and symbol indices.  */
 362   if (info->relocatable)
 363     return TRUE;
 364
 365   /* Check if we have the same endianess */
 366   if (   input_bfd->xvec->byteorder != output_bfd->xvec->byteorder
 367       && output_bfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
 368     {
 369       (*_bfd_error_handler)
 370         (_("%B: compiled for a %s system and target is %s.\n"),
 371          input_bfd,
 372          bfd_big_endian (input_bfd) ? _("big endian") : _("little endian"),
 373          bfd_big_endian (output_bfd) ? _("big endian") : _("little endian"));
 374
 375       bfd_set_error (bfd_error_wrong_format);
 376       return FALSE;
 377     }
 378
 379   hihalf = FALSE;
 380   hihalf_val = 0;
 381
 382   rel = relocs;
 383   relend = rel + input_section->reloc_count;
 384
 385   for (; rel < relend; rel++)
 386     {
 387       long                           symndx;
 388       struct internal_syment *       sym;
 389       bfd_vma                        val;
 390       bfd_vma                        addend;
 391       bfd_reloc_status_type          rstat;
 392       bfd_byte *                     loc;
 393       unsigned short                 r_type = rel->r_type;
 394       reloc_howto_type *             howto = NULL;
 395       struct coff_link_hash_entry *  h;
 396       const char *                   my_name;
 397
 398       symndx = rel->r_symndx;
 399       loc = contents + rel->r_vaddr - input_section->vma;
 400
 401       if (symndx == -1)
 402         {
 403           h = NULL;
 404           sym = NULL;
 405         }
 406       else
 407         {
 408           h = obj_coff_sym_hashes (input_bfd)[symndx];
 409           sym = syms + symndx;
 410         }
 411
 412       addend = 0;
 413
 414       /* Get the howto and initialise the addend.  */
 415       howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
 416                                        sym, & addend);
 417       if (howto == NULL)
 418         return FALSE;
 419
 420       val = 0;
 421
 422       if (h == NULL)
 423         {
 424           if (symndx == -1)
 425             my_name = "*ABS*";
 426           else
 427             {
 428               asection * sec = sections[symndx];
 429
 430               val = (sym->n_value
 431                      + sec->output_section->vma
 432                      + sec->output_offset);
 433
 434               if (sym == NULL)
 435                 my_name = "*unknown*";
 436               else if (   sym->_n._n_n._n_zeroes == 0
 437                        && sym->_n._n_n._n_offset != 0)
 438                 my_name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
 439               else
 440                 {
 441                   static char buf [SYMNMLEN + 1];
 442
 443                   strncpy (buf, sym->_n._n_name, SYMNMLEN);
 444                   buf[SYMNMLEN] = '\0';
 445                   my_name = buf;
 446                 }
 447             }
 448         }
 449       else
 450         {
 451           if (   h->root.type == bfd_link_hash_defined
 452               || h->root.type == bfd_link_hash_defweak)
 453             {
 454               asection * sec = h->root.u.def.section;
 455
 456               val = (h->root.u.def.value
 457                      + sec->output_section->vma
 458                      + sec->output_offset);
 459             }
 460           else
 461             {
 462               if (! ((*info->callbacks->undefined_symbol)
 463                      (info, h->root.root.string, input_bfd, input_section,
 464                       rel->r_vaddr - input_section->vma, TRUE)))
 465                 return FALSE;
 466             }
 467
 468           my_name = h->root.root.string;
 469         }
 470
 471       rstat = bfd_reloc_ok;
 472
 473       /* Each case must do its own relocation, setting rstat appropriately.  */
 474       switch (r_type)
 475         {
 476         default:
 477           _bfd_error_handler (_("%B: unsupported relocation type 0x%02x"),
 478                               input_bfd, r_type);
 479           bfd_set_error (bfd_error_bad_value);
 480           return FALSE;
 481
 482         case IMAGE_REL_MCORE_ABSOLUTE:
 483           _bfd_error_handler
 484             (_("Warning: unsupported reloc %s <file %B, section %A>\n"
 485                "sym %ld (%s), r_vaddr %ld (%lx)"),
 486              input_bfd, input_section, howto->name,
 487              rel->r_symndx, my_name, (long) rel->r_vaddr,
 488              (unsigned long) rel->r_vaddr);
 489           break;
 490
 491         case IMAGE_REL_MCORE_PCREL_IMM8BY4:
 492         case IMAGE_REL_MCORE_PCREL_IMM11BY2:
 493         case IMAGE_REL_MCORE_PCREL_IMM4BY2:
 494         case IMAGE_REL_MCORE_PCREL_32:
 495         case IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2:
 496         case IMAGE_REL_MCORE_ADDR32:
 497           /* XXX fixme - shouldn't this be like the code for the RVA reloc ? */
 498           rstat = _bfd_relocate_contents (howto, input_bfd, val, loc);
 499           break;
 500
 501         case IMAGE_REL_MCORE_RVA:
 502           rstat = _bfd_final_link_relocate
 503             (howto, input_bfd,
 504              input_section, contents, rel->r_vaddr - input_section->vma,
 505              val, addend);
 506           break;
 507         }
 508
 509       if (info->base_file)
 510         {
 511           /* Emit a reloc if the backend thinks it needs it.  */
 512           if (sym && pe_data (output_bfd)->in_reloc_p (output_bfd, howto))
 513             mcore_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
 514         }
 515
 516       switch (rstat)
 517         {
 518         default:
 519           abort ();
 520
 521         case bfd_reloc_ok:
 522           break;
 523
 524         case bfd_reloc_overflow:
 525           if (! ((*info->callbacks->reloc_overflow)
 526                  (info, (h ? &h->root : NULL), my_name, howto->name,
 527                   (bfd_vma) 0, input_bfd,
 528                   input_section, rel->r_vaddr - input_section->vma)))
 529             return FALSE;
 530         }
 531     }
 532
 533   return TRUE;
 534 }
 535 \f
 536 /* Tailor coffcode.h -- macro heaven.  */
 537
 538 /* We use the special COFF backend linker, with our own special touch.  */
 539
 540 #define coff_bfd_reloc_type_lookup   mcore_coff_reloc_type_lookup
 541 #define coff_relocate_section        coff_mcore_relocate_section
 542 #define coff_rtype_to_howto          coff_mcore_rtype_to_howto
 543
 544 #define SELECT_RELOC(internal, howto) {internal.r_type = howto->type;}
 545
 546 /* Make sure that the 'r_offset' field is copied properly
 547    so that identical binaries will compare the same.  */
 548 #define SWAP_IN_RELOC_OFFSET         H_GET_32
 549 #define SWAP_OUT_RELOC_OFFSET        H_PUT_32
 550
 551 #define COFF_PAGE_SIZE               0x1000
 552
 553 #include "coffcode.h"
 554 \f
 555 /* Forward declaration to initialise alternative_target field.  */
 556 extern const bfd_target TARGET_LITTLE_SYM;
 557
 558 /* The transfer vectors that lead the outside world to all of the above.  */
 559 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED,
 560                             (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
 561                             0, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)
 562 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED,
 563                                (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
 564                                0, & TARGET_BIG_SYM, COFF_SWAP_TABLE)