bfd/elf32-mcore.c

   1 /* Motorola MCore specific support for 32-bit ELF
   2    Copyright 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
   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, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
  20    USA.  */
  21
  22 /* This file is based on a preliminary RCE ELF ABI.  The
  23    information may not match the final RCE ELF ABI.   */
  24
  25 #include "bfd.h"
  26 #include "sysdep.h"
  27 #include "bfdlink.h"
  28 #include "libbfd.h"
  29 #include "elf-bfd.h"
  30 #include "elf/mcore.h"
  31 #include <assert.h>
  32
  33 /* RELA relocs are used here...  */
  34
  35 /* Function to set whether a module needs the -mrelocatable bit set.  */
  36
  37 static bfd_boolean
  38 mcore_elf_set_private_flags (bfd * abfd, flagword flags)
  39 {
  40   BFD_ASSERT (! elf_flags_init (abfd)
  41               || elf_elfheader (abfd)->e_flags == flags);
  42
  43   elf_elfheader (abfd)->e_flags = flags;
  44   elf_flags_init (abfd) = TRUE;
  45   return TRUE;
  46 }
  47
  48 /* Merge backend specific data from an object file to the output
  49    object file when linking.  */
  50
  51 static bfd_boolean
  52 mcore_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
  53 {
  54   flagword old_flags;
  55   flagword new_flags;
  56
  57   /* Check if we have the same endianess.  */
  58   if (! _bfd_generic_verify_endian_match (ibfd, obfd))
  59     return FALSE;
  60
  61   if (   bfd_get_flavour (ibfd) != bfd_target_elf_flavour
  62       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
  63     return TRUE;
  64
  65   new_flags = elf_elfheader (ibfd)->e_flags;
  66   old_flags = elf_elfheader (obfd)->e_flags;
  67
  68   if (! elf_flags_init (obfd))
  69     {
  70         /* First call, no flags set.  */
  71       elf_flags_init (obfd) = TRUE;
  72       elf_elfheader (obfd)->e_flags = new_flags;
  73     }
  74   else if (new_flags == old_flags)
  75     /* Compatible flags are OK.  */
  76     ;
  77   else
  78     {
  79       /* FIXME */
  80     }
  81
  82   return TRUE;
  83 }
  84 \f
  85 /* Don't pretend we can deal with unsupported relocs.  */
  86
  87 static bfd_reloc_status_type
  88 mcore_elf_unsupported_reloc (bfd * abfd,
  89                              arelent * reloc_entry,
  90                              asymbol * symbol ATTRIBUTE_UNUSED,
  91                              PTR data ATTRIBUTE_UNUSED,
  92                              asection * input_section ATTRIBUTE_UNUSED,
  93                              bfd * output_bfd ATTRIBUTE_UNUSED,
  94                              char ** error_message ATTRIBUTE_UNUSED)
  95 {
  96   BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
  97
  98   _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
  99                       abfd,
 100                       reloc_entry->howto->name,
 101                       reloc_entry->howto->type);
 102
 103   return bfd_reloc_notsupported;
 104 }
 105
 106 static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max];
 107
 108 static reloc_howto_type mcore_elf_howto_raw[] =
 109 {
 110   /* This reloc does nothing.  */
 111   HOWTO (R_MCORE_NONE,          /* type */
 112          0,                     /* rightshift */
 113          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 114          32,                    /* bitsize */
 115          FALSE,                 /* pc_relative */
 116          0,                     /* bitpos */
 117          complain_overflow_bitfield,  /* complain_on_overflow */
 118          NULL,                  /* special_function */
 119          "R_MCORE_NONE",        /* name */
 120          FALSE,                 /* partial_inplace */
 121          0,                     /* src_mask */
 122          0,                     /* dst_mask */
 123          FALSE),                /* pcrel_offset */
 124
 125   /* A standard 32 bit relocation.  */
 126   HOWTO (R_MCORE_ADDR32,        /* type */
 127          0,                     /* rightshift */
 128          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 129          32,                    /* bitsize */
 130          FALSE,                 /* pc_relative */
 131          0,                     /* bitpos */
 132          complain_overflow_bitfield, /* complain_on_overflow */
 133          bfd_elf_generic_reloc, /* special_function */
 134          "ADDR32",              /* name *//* For compatibility with coff/pe port.  */
 135          FALSE,                 /* partial_inplace */
 136          0x0,                   /* src_mask */
 137          0xffffffff,            /* dst_mask */
 138          FALSE),                /* pcrel_offset */
 139
 140   /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
 141      Should not appear in object files.  */
 142   HOWTO (R_MCORE_PCRELIMM8BY4,  /* type */
 143          2,                     /* rightshift */
 144          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 145          8,                     /* bitsize */
 146          TRUE,                  /* pc_relative */
 147          0,                     /* bitpos */
 148          complain_overflow_bitfield, /* complain_on_overflow */
 149          mcore_elf_unsupported_reloc,   /* special_function */
 150          "R_MCORE_PCRELIMM8BY4",/* name */
 151          FALSE,                 /* partial_inplace */
 152          0,                     /* src_mask */
 153          0,                     /* dst_mask */
 154          TRUE),                 /* pcrel_offset */
 155
 156   /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
 157      Span 2k instructions == 4k bytes.
 158      Only useful pieces at the relocated address are the opcode (5 bits) */
 159   HOWTO (R_MCORE_PCRELIMM11BY2,/* type */
 160          1,                     /* rightshift */
 161          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 162          11,                    /* bitsize */
 163          TRUE,                  /* pc_relative */
 164          0,                     /* bitpos */
 165          complain_overflow_signed, /* complain_on_overflow */
 166          bfd_elf_generic_reloc, /* special_function */
 167          "R_MCORE_PCRELIMM11BY2",/* name */
 168          FALSE,                 /* partial_inplace */
 169          0x0,                   /* src_mask */
 170          0x7ff,                 /* dst_mask */
 171          TRUE),                 /* pcrel_offset */
 172
 173   /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported.  */
 174   HOWTO (R_MCORE_PCRELIMM4BY2,  /* type */
 175          1,                     /* rightshift */
 176          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 177          4,                     /* bitsize */
 178          TRUE,                  /* pc_relative */
 179          0,                     /* bitpos */
 180          complain_overflow_bitfield, /* complain_on_overflow */
 181          mcore_elf_unsupported_reloc,/* special_function */
 182          "R_MCORE_PCRELIMM4BY2",/* name */
 183          FALSE,                 /* partial_inplace */
 184          0,                     /* src_mask */
 185          0,                     /* dst_mask */
 186          TRUE),                 /* pcrel_offset */
 187
 188   /* 32-bit pc-relative. Eventually this will help support PIC code.  */
 189   HOWTO (R_MCORE_PCREL32,       /* type */
 190          0,                     /* rightshift */
 191          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 192          32,                    /* bitsize */
 193          TRUE,                  /* pc_relative */
 194          0,                     /* bitpos */
 195          complain_overflow_bitfield, /* complain_on_overflow */
 196          bfd_elf_generic_reloc, /* special_function */
 197          "R_MCORE_PCREL32",     /* name */
 198          FALSE,                 /* partial_inplace */
 199          0x0,                   /* src_mask */
 200          0xffffffff,            /* dst_mask */
 201          TRUE),                 /* pcrel_offset */
 202
 203   /* Like PCRELIMM11BY2, this relocation indicates that there is a
 204      'jsri' at the specified address. There is a separate relocation
 205      entry for the literal pool entry that it references, but we
 206      might be able to change the jsri to a bsr if the target turns out
 207      to be close enough [even though we won't reclaim the literal pool
 208      entry, we'll get some runtime efficiency back]. Note that this
 209      is a relocation that we are allowed to safely ignore.  */
 210   HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */
 211          1,                     /* rightshift */
 212          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 213          11,                    /* bitsize */
 214          TRUE,                  /* pc_relative */
 215          0,                     /* bitpos */
 216          complain_overflow_signed, /* complain_on_overflow */
 217          bfd_elf_generic_reloc, /* special_function */
 218          "R_MCORE_PCRELJSR_IMM11BY2", /* name */
 219          FALSE,                 /* partial_inplace */
 220          0x0,                   /* src_mask */
 221          0x7ff,                 /* dst_mask */
 222          TRUE),                 /* pcrel_offset */
 223
 224   /* GNU extension to record C++ vtable hierarchy.  */
 225   HOWTO (R_MCORE_GNU_VTINHERIT, /* type */
 226          0,                     /* rightshift */
 227          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 228          0,                     /* bitsize */
 229          FALSE,                 /* pc_relative */
 230          0,                     /* bitpos */
 231          complain_overflow_dont, /* complain_on_overflow */
 232          NULL,                  /* special_function */
 233          "R_MCORE_GNU_VTINHERIT", /* name */
 234          FALSE,                 /* partial_inplace */
 235          0,                     /* src_mask */
 236          0,                     /* dst_mask */
 237          FALSE),                /* pcrel_offset */
 238
 239   /* GNU extension to record C++ vtable member usage.  */
 240   HOWTO (R_MCORE_GNU_VTENTRY,   /* type */
 241          0,                     /* rightshift */
 242          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 243          0,                     /* bitsize */
 244          FALSE,                 /* pc_relative */
 245          0,                     /* bitpos */
 246          complain_overflow_dont,/* complain_on_overflow */
 247          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 248          "R_MCORE_GNU_VTENTRY", /* name */
 249          FALSE,                 /* partial_inplace */
 250          0,                     /* src_mask */
 251          0,                     /* dst_mask */
 252          FALSE),                /* pcrel_offset */
 253
 254   HOWTO (R_MCORE_RELATIVE,      /* type */
 255          0,                     /* rightshift */
 256          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 257          32,                    /* bitsize */
 258          FALSE,                 /* pc_relative */
 259          0,                     /* bitpos */
 260          complain_overflow_signed, /* complain_on_overflow */
 261          NULL,                  /* special_function */
 262          "R_MCORE_RELATIVE",    /* name */
 263          TRUE,                  /* partial_inplace */
 264          0xffffffff,            /* src_mask */
 265          0xffffffff,            /* dst_mask */
 266          FALSE)                 /* pcrel_offset */
 267 };
 268
 269 #ifndef NUM_ELEM
 270 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
 271 #endif
 272 \f
 273 /* Initialize the mcore_elf_howto_table, so that linear accesses can be done.  */
 274 static void
 275 mcore_elf_howto_init (void)
 276 {
 277   unsigned int i;
 278
 279   for (i = NUM_ELEM (mcore_elf_howto_raw); i--;)
 280     {
 281       unsigned int type;
 282
 283       type = mcore_elf_howto_raw[i].type;
 284
 285       BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table));
 286
 287       mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i];
 288     }
 289 }
 290 \f
 291 static reloc_howto_type *
 292 mcore_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
 293                              bfd_reloc_code_real_type code)
 294 {
 295   enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE;
 296
 297   switch (code)
 298     {
 299     case BFD_RELOC_NONE:                     mcore_reloc = R_MCORE_NONE; break;
 300     case BFD_RELOC_32:                       mcore_reloc = R_MCORE_ADDR32; break;
 301     case BFD_RELOC_MCORE_PCREL_IMM8BY4:      mcore_reloc = R_MCORE_PCRELIMM8BY4; break;
 302     case BFD_RELOC_MCORE_PCREL_IMM11BY2:     mcore_reloc = R_MCORE_PCRELIMM11BY2; break;
 303     case BFD_RELOC_MCORE_PCREL_IMM4BY2:      mcore_reloc = R_MCORE_PCRELIMM4BY2; break;
 304     case BFD_RELOC_32_PCREL:                 mcore_reloc = R_MCORE_PCREL32; break;
 305     case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break;
 306     case BFD_RELOC_VTABLE_INHERIT:           mcore_reloc = R_MCORE_GNU_VTINHERIT; break;
 307     case BFD_RELOC_VTABLE_ENTRY:             mcore_reloc = R_MCORE_GNU_VTENTRY; break;
 308     case BFD_RELOC_RVA:                      mcore_reloc = R_MCORE_RELATIVE; break;
 309     default:
 310       return NULL;
 311     }
 312
 313   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
 314     /* Initialize howto table if needed.  */
 315     mcore_elf_howto_init ();
 316
 317   return mcore_elf_howto_table [(int) mcore_reloc];
 318 };
 319
 320 /* Set the howto pointer for a RCE ELF reloc.  */
 321
 322 static void
 323 mcore_elf_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
 324                          arelent * cache_ptr,
 325                          Elf_Internal_Rela * dst)
 326 {
 327   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
 328     /* Initialize howto table if needed.  */
 329     mcore_elf_howto_init ();
 330
 331   BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max);
 332
 333   cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)];
 334 }
 335 \f
 336 /* The RELOCATE_SECTION function is called by the ELF backend linker
 337    to handle the relocations for a section.
 338
 339    The relocs are always passed as Rela structures; if the section
 340    actually uses Rel structures, the r_addend field will always be
 341    zero.
 342
 343    This function is responsible for adjust the section contents as
 344    necessary, and (if using Rela relocs and generating a
 345    relocatable output file) adjusting the reloc addend as
 346    necessary.
 347
 348    This function does not have to worry about setting the reloc
 349    address or the reloc symbol index.
 350
 351    LOCAL_SYMS is a pointer to the swapped in local symbols.
 352
 353    LOCAL_SECTIONS is an array giving the section in the input file
 354    corresponding to the st_shndx field of each local symbol.
 355
 356    The global hash table entry for the global symbols can be found
 357    via elf_sym_hashes (input_bfd).
 358
 359    When generating relocatable output, this function must handle
 360    STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 361    going to be the section symbol corresponding to the output
 362    section, which means that the addend must be adjusted
 363    accordingly.  */
 364
 365 static bfd_boolean
 366 mcore_elf_relocate_section (bfd * output_bfd,
 367                             struct bfd_link_info * info,
 368                             bfd * input_bfd,
 369                             asection * input_section,
 370                             bfd_byte * contents,
 371                             Elf_Internal_Rela * relocs,
 372                             Elf_Internal_Sym * local_syms,
 373                             asection ** local_sections)
 374 {
 375   Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
 376   struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
 377   Elf_Internal_Rela * rel = relocs;
 378   Elf_Internal_Rela * relend = relocs + input_section->reloc_count;
 379   bfd_boolean ret = TRUE;
 380
 381 #ifdef DEBUG
 382   _bfd_error_handler
 383     ("mcore_elf_relocate_section called for %B section %A, %ld relocations%s",
 384      input_bfd,
 385      input_section,
 386      (long) input_section->reloc_count,
 387      (info->relocatable) ? " (relocatable)" : "");
 388 #endif
 389
 390   if (info->relocatable)
 391     return TRUE;
 392
 393   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])   /* Initialize howto table if needed */
 394     mcore_elf_howto_init ();
 395
 396   for (; rel < relend; rel++)
 397     {
 398       enum elf_mcore_reloc_type    r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
 399       bfd_vma                      offset = rel->r_offset;
 400       bfd_vma                      addend = rel->r_addend;
 401       bfd_reloc_status_type        r = bfd_reloc_other;
 402       asection *                   sec = NULL;
 403       reloc_howto_type *           howto;
 404       bfd_vma                      relocation;
 405       Elf_Internal_Sym *           sym = NULL;
 406       unsigned long                r_symndx;
 407       struct elf_link_hash_entry * h = NULL;
 408       unsigned short               oldinst = 0;
 409
 410       /* Unknown relocation handling.  */
 411       if ((unsigned) r_type >= (unsigned) R_MCORE_max
 412           || ! mcore_elf_howto_table [(int)r_type])
 413         {
 414           _bfd_error_handler (_("%B: Unknown relocation type %d\n"),
 415                               input_bfd, (int) r_type);
 416
 417           bfd_set_error (bfd_error_bad_value);
 418           ret = FALSE;
 419           continue;
 420         }
 421
 422       howto = mcore_elf_howto_table [(int) r_type];
 423       r_symndx = ELF32_R_SYM (rel->r_info);
 424
 425       /* Complain about known relocation that are not yet supported.  */
 426       if (howto->special_function == mcore_elf_unsupported_reloc)
 427         {
 428           _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
 429                               input_bfd,
 430                               howto->name,
 431                               (int)r_type);
 432
 433           bfd_set_error (bfd_error_bad_value);
 434           ret = FALSE;
 435           continue;
 436         }
 437
 438       if (r_symndx < symtab_hdr->sh_info)
 439         {
 440           sym = local_syms + r_symndx;
 441           sec = local_sections [r_symndx];
 442           relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
 443           addend = rel->r_addend;
 444         }
 445       else
 446         {
 447           bfd_boolean unresolved_reloc, warned;
 448
 449           RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
 450                                    r_symndx, symtab_hdr, sym_hashes,
 451                                    h, sec, relocation,
 452                                    unresolved_reloc, warned);
 453         }
 454
 455       switch (r_type)
 456         {
 457         default:
 458           break;
 459
 460         case R_MCORE_PCRELJSR_IMM11BY2:
 461           oldinst = bfd_get_16 (input_bfd, contents + offset);
 462 #define MCORE_INST_BSR  0xF800
 463           bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset);
 464           break;
 465         }
 466
 467 #ifdef DEBUG
 468       fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
 469                howto->name, r_type, r_symndx, (long) offset, (long) addend);
 470 #endif
 471
 472       r = _bfd_final_link_relocate
 473         (howto, input_bfd, input_section, contents, offset, relocation, addend);
 474
 475       if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
 476         {
 477           /* Wasn't ok, back it out and give up.  */
 478           bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset);
 479           r = bfd_reloc_ok;
 480         }
 481
 482       if (r != bfd_reloc_ok)
 483         {
 484           ret = FALSE;
 485
 486           switch (r)
 487             {
 488             default:
 489               break;
 490
 491             case bfd_reloc_overflow:
 492               {
 493                 const char * name;
 494
 495                 if (h != NULL)
 496                   name = NULL;
 497                 else
 498                   {
 499                     name = bfd_elf_string_from_elf_section
 500                       (input_bfd, symtab_hdr->sh_link, sym->st_name);
 501
 502                     if (name == NULL)
 503                       break;
 504
 505                     if (* name == '\0')
 506                       name = bfd_section_name (input_bfd, sec);
 507                   }
 508
 509                 (*info->callbacks->reloc_overflow)
 510                   (info, (h ? &h->root : NULL), name, howto->name,
 511                    (bfd_vma) 0, input_bfd, input_section, offset);
 512               }
 513               break;
 514             }
 515         }
 516     }
 517
 518 #ifdef DEBUG
 519   fprintf (stderr, "\n");
 520 #endif
 521
 522   return ret;
 523 }
 524 \f
 525 /* Return the section that should be marked against GC for a given
 526    relocation.  */
 527
 528 static asection *
 529 mcore_elf_gc_mark_hook (asection *sec,
 530                         struct bfd_link_info *info,
 531                         Elf_Internal_Rela *rel,
 532                         struct elf_link_hash_entry *h,
 533                         Elf_Internal_Sym *sym)
 534 {
 535   if (h != NULL)
 536     switch (ELF32_R_TYPE (rel->r_info))
 537       {
 538       case R_MCORE_GNU_VTINHERIT:
 539       case R_MCORE_GNU_VTENTRY:
 540         return NULL;
 541       }
 542
 543   return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
 544 }
 545
 546 /* Update the got entry reference counts for the section being removed.  */
 547
 548 static bfd_boolean
 549 mcore_elf_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
 550                          struct bfd_link_info * info ATTRIBUTE_UNUSED,
 551                          asection * sec ATTRIBUTE_UNUSED,
 552                          const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
 553 {
 554   return TRUE;
 555 }
 556
 557 /* Look through the relocs for a section during the first phase.
 558    Since we don't do .gots or .plts, we just need to consider the
 559    virtual table relocs for gc.  */
 560
 561 static bfd_boolean
 562 mcore_elf_check_relocs (bfd * abfd,
 563                         struct bfd_link_info * info,
 564                         asection * sec,
 565                         const Elf_Internal_Rela * relocs)
 566 {
 567   Elf_Internal_Shdr * symtab_hdr;
 568   struct elf_link_hash_entry ** sym_hashes;
 569   struct elf_link_hash_entry ** sym_hashes_end;
 570   const Elf_Internal_Rela * rel;
 571   const Elf_Internal_Rela * rel_end;
 572
 573   if (info->relocatable)
 574     return TRUE;
 575
 576   symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
 577   sym_hashes = elf_sym_hashes (abfd);
 578   sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
 579   if (!elf_bad_symtab (abfd))
 580     sym_hashes_end -= symtab_hdr->sh_info;
 581
 582   rel_end = relocs + sec->reloc_count;
 583
 584   for (rel = relocs; rel < rel_end; rel++)
 585     {
 586       struct elf_link_hash_entry * h;
 587       unsigned long r_symndx;
 588
 589       r_symndx = ELF32_R_SYM (rel->r_info);
 590
 591       if (r_symndx < symtab_hdr->sh_info)
 592         h = NULL;
 593       else
 594         {
 595           h = sym_hashes [r_symndx - symtab_hdr->sh_info];
 596           while (h->root.type == bfd_link_hash_indirect
 597                  || h->root.type == bfd_link_hash_warning)
 598             h = (struct elf_link_hash_entry *) h->root.u.i.link;
 599         }
 600
 601       switch (ELF32_R_TYPE (rel->r_info))
 602         {
 603         /* This relocation describes the C++ object vtable hierarchy.
 604            Reconstruct it for later use during GC.  */
 605         case R_MCORE_GNU_VTINHERIT:
 606           if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
 607             return FALSE;
 608           break;
 609
 610         /* This relocation describes which C++ vtable entries are actually
 611            used.  Record for later use during GC.  */
 612         case R_MCORE_GNU_VTENTRY:
 613           if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
 614             return FALSE;
 615           break;
 616         }
 617     }
 618
 619   return TRUE;
 620 }
 621
 622 static const struct bfd_elf_special_section mcore_elf_special_sections[]=
 623 {
 624   { STRING_COMMA_LEN (".ctors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 625   { STRING_COMMA_LEN (".dtors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 626   { NULL,                     0,  0, 0,            0 }
 627 };
 628
 629 #define TARGET_BIG_SYM          bfd_elf32_mcore_big_vec
 630 #define TARGET_BIG_NAME         "elf32-mcore-big"
 631 #define TARGET_LITTLE_SYM       bfd_elf32_mcore_little_vec
 632 #define TARGET_LITTLE_NAME      "elf32-mcore-little"
 633
 634 #define ELF_ARCH                bfd_arch_mcore
 635 #define ELF_MACHINE_CODE        EM_MCORE
 636 #define ELF_MAXPAGESIZE         0x1000          /* 4k, if we ever have 'em */
 637 #define elf_info_to_howto       mcore_elf_info_to_howto
 638 #define elf_info_to_howto_rel   NULL
 639
 640 #define bfd_elf32_bfd_merge_private_bfd_data    mcore_elf_merge_private_bfd_data
 641 #define bfd_elf32_bfd_set_private_flags         mcore_elf_set_private_flags
 642 #define bfd_elf32_bfd_reloc_type_lookup         mcore_elf_reloc_type_lookup
 643 #define elf_backend_relocate_section            mcore_elf_relocate_section
 644 #define elf_backend_gc_mark_hook                mcore_elf_gc_mark_hook
 645 #define elf_backend_gc_sweep_hook               mcore_elf_gc_sweep_hook
 646 #define elf_backend_check_relocs                mcore_elf_check_relocs
 647 #define elf_backend_special_sections            mcore_elf_special_sections
 648
 649 #define elf_backend_can_gc_sections             1
 650 #define elf_backend_rela_normal                 1
 651
 652 #include "elf32-target.h"