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    2007 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 3 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,
  20    MA 02110-1301, USA.  */
  21
  22
  23 /* This file is based on a preliminary RCE ELF ABI.  The
  24    information may not match the final RCE ELF ABI.   */
  25
  26 #include "sysdep.h"
  27 #include "bfd.h"
  28 #include "bfdlink.h"
  29 #include "libbfd.h"
  30 #include "elf-bfd.h"
  31 #include "elf/mcore.h"
  32 #include <assert.h>
  33
  34 /* RELA relocs are used here...  */
  35
  36 /* Function to set whether a module needs the -mrelocatable bit set.  */
  37
  38 static bfd_boolean
  39 mcore_elf_set_private_flags (bfd * abfd, flagword flags)
  40 {
  41   BFD_ASSERT (! elf_flags_init (abfd)
  42               || elf_elfheader (abfd)->e_flags == flags);
  43
  44   elf_elfheader (abfd)->e_flags = flags;
  45   elf_flags_init (abfd) = TRUE;
  46   return TRUE;
  47 }
  48
  49 /* Merge backend specific data from an object file to the output
  50    object file when linking.  */
  51
  52 static bfd_boolean
  53 mcore_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
  54 {
  55   flagword old_flags;
  56   flagword new_flags;
  57
  58   /* Check if we have the same endianess.  */
  59   if (! _bfd_generic_verify_endian_match (ibfd, obfd))
  60     return FALSE;
  61
  62   if (   bfd_get_flavour (ibfd) != bfd_target_elf_flavour
  63       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
  64     return TRUE;
  65
  66   new_flags = elf_elfheader (ibfd)->e_flags;
  67   old_flags = elf_elfheader (obfd)->e_flags;
  68
  69   if (! elf_flags_init (obfd))
  70     {
  71         /* First call, no flags set.  */
  72       elf_flags_init (obfd) = TRUE;
  73       elf_elfheader (obfd)->e_flags = new_flags;
  74     }
  75   else if (new_flags == old_flags)
  76     /* Compatible flags are OK.  */
  77     ;
  78   else
  79     {
  80       /* FIXME */
  81     }
  82
  83   return TRUE;
  84 }
  85 \f
  86 /* Don't pretend we can deal with unsupported relocs.  */
  87
  88 static bfd_reloc_status_type
  89 mcore_elf_unsupported_reloc (bfd * abfd,
  90                              arelent * reloc_entry,
  91                              asymbol * symbol ATTRIBUTE_UNUSED,
  92                              PTR data ATTRIBUTE_UNUSED,
  93                              asection * input_section ATTRIBUTE_UNUSED,
  94                              bfd * output_bfd ATTRIBUTE_UNUSED,
  95                              char ** error_message ATTRIBUTE_UNUSED)
  96 {
  97   BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
  98
  99   _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
 100                       abfd,
 101                       reloc_entry->howto->name,
 102                       reloc_entry->howto->type);
 103
 104   return bfd_reloc_notsupported;
 105 }
 106
 107 static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max];
 108
 109 static reloc_howto_type mcore_elf_howto_raw[] =
 110 {
 111   /* This reloc does nothing.  */
 112   HOWTO (R_MCORE_NONE,          /* type */
 113          0,                     /* rightshift */
 114          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 115          32,                    /* bitsize */
 116          FALSE,                 /* pc_relative */
 117          0,                     /* bitpos */
 118          complain_overflow_bitfield,  /* complain_on_overflow */
 119          NULL,                  /* special_function */
 120          "R_MCORE_NONE",        /* name */
 121          FALSE,                 /* partial_inplace */
 122          0,                     /* src_mask */
 123          0,                     /* dst_mask */
 124          FALSE),                /* pcrel_offset */
 125
 126   /* A standard 32 bit relocation.  */
 127   HOWTO (R_MCORE_ADDR32,        /* type */
 128          0,                     /* rightshift */
 129          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 130          32,                    /* bitsize */
 131          FALSE,                 /* pc_relative */
 132          0,                     /* bitpos */
 133          complain_overflow_bitfield, /* complain_on_overflow */
 134          bfd_elf_generic_reloc, /* special_function */
 135          "ADDR32",              /* name *//* For compatibility with coff/pe port.  */
 136          FALSE,                 /* partial_inplace */
 137          0x0,                   /* src_mask */
 138          0xffffffff,            /* dst_mask */
 139          FALSE),                /* pcrel_offset */
 140
 141   /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
 142      Should not appear in object files.  */
 143   HOWTO (R_MCORE_PCRELIMM8BY4,  /* type */
 144          2,                     /* rightshift */
 145          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 146          8,                     /* bitsize */
 147          TRUE,                  /* pc_relative */
 148          0,                     /* bitpos */
 149          complain_overflow_bitfield, /* complain_on_overflow */
 150          mcore_elf_unsupported_reloc,   /* special_function */
 151          "R_MCORE_PCRELIMM8BY4",/* name */
 152          FALSE,                 /* partial_inplace */
 153          0,                     /* src_mask */
 154          0,                     /* dst_mask */
 155          TRUE),                 /* pcrel_offset */
 156
 157   /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
 158      Span 2k instructions == 4k bytes.
 159      Only useful pieces at the relocated address are the opcode (5 bits) */
 160   HOWTO (R_MCORE_PCRELIMM11BY2,/* type */
 161          1,                     /* rightshift */
 162          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 163          11,                    /* bitsize */
 164          TRUE,                  /* pc_relative */
 165          0,                     /* bitpos */
 166          complain_overflow_signed, /* complain_on_overflow */
 167          bfd_elf_generic_reloc, /* special_function */
 168          "R_MCORE_PCRELIMM11BY2",/* name */
 169          FALSE,                 /* partial_inplace */
 170          0x0,                   /* src_mask */
 171          0x7ff,                 /* dst_mask */
 172          TRUE),                 /* pcrel_offset */
 173
 174   /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported.  */
 175   HOWTO (R_MCORE_PCRELIMM4BY2,  /* type */
 176          1,                     /* rightshift */
 177          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 178          4,                     /* bitsize */
 179          TRUE,                  /* pc_relative */
 180          0,                     /* bitpos */
 181          complain_overflow_bitfield, /* complain_on_overflow */
 182          mcore_elf_unsupported_reloc,/* special_function */
 183          "R_MCORE_PCRELIMM4BY2",/* name */
 184          FALSE,                 /* partial_inplace */
 185          0,                     /* src_mask */
 186          0,                     /* dst_mask */
 187          TRUE),                 /* pcrel_offset */
 188
 189   /* 32-bit pc-relative. Eventually this will help support PIC code.  */
 190   HOWTO (R_MCORE_PCREL32,       /* type */
 191          0,                     /* rightshift */
 192          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 193          32,                    /* bitsize */
 194          TRUE,                  /* pc_relative */
 195          0,                     /* bitpos */
 196          complain_overflow_bitfield, /* complain_on_overflow */
 197          bfd_elf_generic_reloc, /* special_function */
 198          "R_MCORE_PCREL32",     /* name */
 199          FALSE,                 /* partial_inplace */
 200          0x0,                   /* src_mask */
 201          0xffffffff,            /* dst_mask */
 202          TRUE),                 /* pcrel_offset */
 203
 204   /* Like PCRELIMM11BY2, this relocation indicates that there is a
 205      'jsri' at the specified address. There is a separate relocation
 206      entry for the literal pool entry that it references, but we
 207      might be able to change the jsri to a bsr if the target turns out
 208      to be close enough [even though we won't reclaim the literal pool
 209      entry, we'll get some runtime efficiency back]. Note that this
 210      is a relocation that we are allowed to safely ignore.  */
 211   HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */
 212          1,                     /* rightshift */
 213          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 214          11,                    /* bitsize */
 215          TRUE,                  /* pc_relative */
 216          0,                     /* bitpos */
 217          complain_overflow_signed, /* complain_on_overflow */
 218          bfd_elf_generic_reloc, /* special_function */
 219          "R_MCORE_PCRELJSR_IMM11BY2", /* name */
 220          FALSE,                 /* partial_inplace */
 221          0x0,                   /* src_mask */
 222          0x7ff,                 /* dst_mask */
 223          TRUE),                 /* pcrel_offset */
 224
 225   /* GNU extension to record C++ vtable hierarchy.  */
 226   HOWTO (R_MCORE_GNU_VTINHERIT, /* type */
 227          0,                     /* rightshift */
 228          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 229          0,                     /* bitsize */
 230          FALSE,                 /* pc_relative */
 231          0,                     /* bitpos */
 232          complain_overflow_dont, /* complain_on_overflow */
 233          NULL,                  /* special_function */
 234          "R_MCORE_GNU_VTINHERIT", /* name */
 235          FALSE,                 /* partial_inplace */
 236          0,                     /* src_mask */
 237          0,                     /* dst_mask */
 238          FALSE),                /* pcrel_offset */
 239
 240   /* GNU extension to record C++ vtable member usage.  */
 241   HOWTO (R_MCORE_GNU_VTENTRY,   /* type */
 242          0,                     /* rightshift */
 243          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 244          0,                     /* bitsize */
 245          FALSE,                 /* pc_relative */
 246          0,                     /* bitpos */
 247          complain_overflow_dont,/* complain_on_overflow */
 248          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 249          "R_MCORE_GNU_VTENTRY", /* name */
 250          FALSE,                 /* partial_inplace */
 251          0,                     /* src_mask */
 252          0,                     /* dst_mask */
 253          FALSE),                /* pcrel_offset */
 254
 255   HOWTO (R_MCORE_RELATIVE,      /* type */
 256          0,                     /* rightshift */
 257          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 258          32,                    /* bitsize */
 259          FALSE,                 /* pc_relative */
 260          0,                     /* bitpos */
 261          complain_overflow_signed, /* complain_on_overflow */
 262          NULL,                  /* special_function */
 263          "R_MCORE_RELATIVE",    /* name */
 264          TRUE,                  /* partial_inplace */
 265          0xffffffff,            /* src_mask */
 266          0xffffffff,            /* dst_mask */
 267          FALSE)                 /* pcrel_offset */
 268 };
 269
 270 #ifndef NUM_ELEM
 271 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
 272 #endif
 273 \f
 274 /* Initialize the mcore_elf_howto_table, so that linear accesses can be done.  */
 275 static void
 276 mcore_elf_howto_init (void)
 277 {
 278   unsigned int i;
 279
 280   for (i = NUM_ELEM (mcore_elf_howto_raw); i--;)
 281     {
 282       unsigned int type;
 283
 284       type = mcore_elf_howto_raw[i].type;
 285
 286       BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table));
 287
 288       mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i];
 289     }
 290 }
 291 \f
 292 static reloc_howto_type *
 293 mcore_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
 294                              bfd_reloc_code_real_type code)
 295 {
 296   enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE;
 297
 298   switch (code)
 299     {
 300     case BFD_RELOC_NONE:                     mcore_reloc = R_MCORE_NONE; break;
 301     case BFD_RELOC_32:                       mcore_reloc = R_MCORE_ADDR32; break;
 302     case BFD_RELOC_MCORE_PCREL_IMM8BY4:      mcore_reloc = R_MCORE_PCRELIMM8BY4; break;
 303     case BFD_RELOC_MCORE_PCREL_IMM11BY2:     mcore_reloc = R_MCORE_PCRELIMM11BY2; break;
 304     case BFD_RELOC_MCORE_PCREL_IMM4BY2:      mcore_reloc = R_MCORE_PCRELIMM4BY2; break;
 305     case BFD_RELOC_32_PCREL:                 mcore_reloc = R_MCORE_PCREL32; break;
 306     case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break;
 307     case BFD_RELOC_VTABLE_INHERIT:           mcore_reloc = R_MCORE_GNU_VTINHERIT; break;
 308     case BFD_RELOC_VTABLE_ENTRY:             mcore_reloc = R_MCORE_GNU_VTENTRY; break;
 309     case BFD_RELOC_RVA:                      mcore_reloc = R_MCORE_RELATIVE; break;
 310     default:
 311       return NULL;
 312     }
 313
 314   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
 315     /* Initialize howto table if needed.  */
 316     mcore_elf_howto_init ();
 317
 318   return mcore_elf_howto_table [(int) mcore_reloc];
 319 };
 320
 321 static reloc_howto_type *
 322 mcore_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 323                              const char *r_name)
 324 {
 325   unsigned int i;
 326
 327   for (i = 0;
 328        i < sizeof (mcore_elf_howto_raw) / sizeof (mcore_elf_howto_raw[0]);
 329        i++)
 330     if (mcore_elf_howto_raw[i].name != NULL
 331         && strcasecmp (mcore_elf_howto_raw[i].name, r_name) == 0)
 332       return &mcore_elf_howto_raw[i];
 333
 334   return NULL;
 335 }
 336
 337 /* Set the howto pointer for a RCE ELF reloc.  */
 338
 339 static void
 340 mcore_elf_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
 341                          arelent * cache_ptr,
 342                          Elf_Internal_Rela * dst)
 343 {
 344   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
 345     /* Initialize howto table if needed.  */
 346     mcore_elf_howto_init ();
 347
 348   BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max);
 349
 350   cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)];
 351 }
 352 \f
 353 /* The RELOCATE_SECTION function is called by the ELF backend linker
 354    to handle the relocations for a section.
 355
 356    The relocs are always passed as Rela structures; if the section
 357    actually uses Rel structures, the r_addend field will always be
 358    zero.
 359
 360    This function is responsible for adjust the section contents as
 361    necessary, and (if using Rela relocs and generating a
 362    relocatable output file) adjusting the reloc addend as
 363    necessary.
 364
 365    This function does not have to worry about setting the reloc
 366    address or the reloc symbol index.
 367
 368    LOCAL_SYMS is a pointer to the swapped in local symbols.
 369
 370    LOCAL_SECTIONS is an array giving the section in the input file
 371    corresponding to the st_shndx field of each local symbol.
 372
 373    The global hash table entry for the global symbols can be found
 374    via elf_sym_hashes (input_bfd).
 375
 376    When generating relocatable output, this function must handle
 377    STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 378    going to be the section symbol corresponding to the output
 379    section, which means that the addend must be adjusted
 380    accordingly.  */
 381
 382 static bfd_boolean
 383 mcore_elf_relocate_section (bfd * output_bfd,
 384                             struct bfd_link_info * info,
 385                             bfd * input_bfd,
 386                             asection * input_section,
 387                             bfd_byte * contents,
 388                             Elf_Internal_Rela * relocs,
 389                             Elf_Internal_Sym * local_syms,
 390                             asection ** local_sections)
 391 {
 392   Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
 393   struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
 394   Elf_Internal_Rela * rel = relocs;
 395   Elf_Internal_Rela * relend = relocs + input_section->reloc_count;
 396   bfd_boolean ret = TRUE;
 397
 398 #ifdef DEBUG
 399   _bfd_error_handler
 400     ("mcore_elf_relocate_section called for %B section %A, %ld relocations%s",
 401      input_bfd,
 402      input_section,
 403      (long) input_section->reloc_count,
 404      (info->relocatable) ? " (relocatable)" : "");
 405 #endif
 406
 407   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])   /* Initialize howto table if needed */
 408     mcore_elf_howto_init ();
 409
 410   for (; rel < relend; rel++)
 411     {
 412       enum elf_mcore_reloc_type    r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
 413       bfd_vma                      offset = rel->r_offset;
 414       bfd_vma                      addend = rel->r_addend;
 415       bfd_reloc_status_type        r = bfd_reloc_other;
 416       asection *                   sec = NULL;
 417       reloc_howto_type *           howto;
 418       bfd_vma                      relocation;
 419       Elf_Internal_Sym *           sym = NULL;
 420       unsigned long                r_symndx;
 421       struct elf_link_hash_entry * h = NULL;
 422       unsigned short               oldinst = 0;
 423
 424       /* Unknown relocation handling.  */
 425       if ((unsigned) r_type >= (unsigned) R_MCORE_max
 426           || ! mcore_elf_howto_table [(int)r_type])
 427         {
 428           _bfd_error_handler (_("%B: Unknown relocation type %d\n"),
 429                               input_bfd, (int) r_type);
 430
 431           bfd_set_error (bfd_error_bad_value);
 432           ret = FALSE;
 433           continue;
 434         }
 435
 436       howto = mcore_elf_howto_table [(int) r_type];
 437       r_symndx = ELF32_R_SYM (rel->r_info);
 438
 439       /* Complain about known relocation that are not yet supported.  */
 440       if (howto->special_function == mcore_elf_unsupported_reloc)
 441         {
 442           _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"),
 443                               input_bfd,
 444                               howto->name,
 445                               (int)r_type);
 446
 447           bfd_set_error (bfd_error_bad_value);
 448           ret = FALSE;
 449           continue;
 450         }
 451
 452       if (r_symndx < symtab_hdr->sh_info)
 453         {
 454           sym = local_syms + r_symndx;
 455           sec = local_sections [r_symndx];
 456           relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
 457           addend = rel->r_addend;
 458         }
 459       else
 460         {
 461           bfd_boolean unresolved_reloc, warned;
 462
 463           RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
 464                                    r_symndx, symtab_hdr, sym_hashes,
 465                                    h, sec, relocation,
 466                                    unresolved_reloc, warned);
 467         }
 468
 469       if (sec != NULL && elf_discarded_section (sec))
 470         RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
 471                                          rel, relend, howto, contents);
 472
 473       if (info->relocatable)
 474         continue;
 475
 476       switch (r_type)
 477         {
 478         default:
 479           break;
 480
 481         case R_MCORE_PCRELJSR_IMM11BY2:
 482           oldinst = bfd_get_16 (input_bfd, contents + offset);
 483 #define MCORE_INST_BSR  0xF800
 484           bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset);
 485           break;
 486         }
 487
 488 #ifdef DEBUG
 489       fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
 490                howto->name, r_type, r_symndx, (long) offset, (long) addend);
 491 #endif
 492
 493       r = _bfd_final_link_relocate
 494         (howto, input_bfd, input_section, contents, offset, relocation, addend);
 495
 496       if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
 497         {
 498           /* Wasn't ok, back it out and give up.  */
 499           bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset);
 500           r = bfd_reloc_ok;
 501         }
 502
 503       if (r != bfd_reloc_ok)
 504         {
 505           ret = FALSE;
 506
 507           switch (r)
 508             {
 509             default:
 510               break;
 511
 512             case bfd_reloc_overflow:
 513               {
 514                 const char * name;
 515
 516                 if (h != NULL)
 517                   name = NULL;
 518                 else
 519                   {
 520                     name = bfd_elf_string_from_elf_section
 521                       (input_bfd, symtab_hdr->sh_link, sym->st_name);
 522
 523                     if (name == NULL)
 524                       break;
 525
 526                     if (* name == '\0')
 527                       name = bfd_section_name (input_bfd, sec);
 528                   }
 529
 530                 (*info->callbacks->reloc_overflow)
 531                   (info, (h ? &h->root : NULL), name, howto->name,
 532                    (bfd_vma) 0, input_bfd, input_section, offset);
 533               }
 534               break;
 535             }
 536         }
 537     }
 538
 539 #ifdef DEBUG
 540   fprintf (stderr, "\n");
 541 #endif
 542
 543   return ret;
 544 }
 545 \f
 546 /* Return the section that should be marked against GC for a given
 547    relocation.  */
 548
 549 static asection *
 550 mcore_elf_gc_mark_hook (asection *sec,
 551                         struct bfd_link_info *info,
 552                         Elf_Internal_Rela *rel,
 553                         struct elf_link_hash_entry *h,
 554                         Elf_Internal_Sym *sym)
 555 {
 556   if (h != NULL)
 557     switch (ELF32_R_TYPE (rel->r_info))
 558       {
 559       case R_MCORE_GNU_VTINHERIT:
 560       case R_MCORE_GNU_VTENTRY:
 561         return NULL;
 562       }
 563
 564   return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
 565 }
 566
 567 /* Update the got entry reference counts for the section being removed.  */
 568
 569 static bfd_boolean
 570 mcore_elf_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
 571                          struct bfd_link_info * info ATTRIBUTE_UNUSED,
 572                          asection * sec ATTRIBUTE_UNUSED,
 573                          const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
 574 {
 575   return TRUE;
 576 }
 577
 578 /* Look through the relocs for a section during the first phase.
 579    Since we don't do .gots or .plts, we just need to consider the
 580    virtual table relocs for gc.  */
 581
 582 static bfd_boolean
 583 mcore_elf_check_relocs (bfd * abfd,
 584                         struct bfd_link_info * info,
 585                         asection * sec,
 586                         const Elf_Internal_Rela * relocs)
 587 {
 588   Elf_Internal_Shdr * symtab_hdr;
 589   struct elf_link_hash_entry ** sym_hashes;
 590   const Elf_Internal_Rela * rel;
 591   const Elf_Internal_Rela * rel_end;
 592
 593   if (info->relocatable)
 594     return TRUE;
 595
 596   symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
 597   sym_hashes = elf_sym_hashes (abfd);
 598
 599   rel_end = relocs + sec->reloc_count;
 600
 601   for (rel = relocs; rel < rel_end; rel++)
 602     {
 603       struct elf_link_hash_entry * h;
 604       unsigned long r_symndx;
 605
 606       r_symndx = ELF32_R_SYM (rel->r_info);
 607
 608       if (r_symndx < symtab_hdr->sh_info)
 609         h = NULL;
 610       else
 611         {
 612           h = sym_hashes [r_symndx - symtab_hdr->sh_info];
 613           while (h->root.type == bfd_link_hash_indirect
 614                  || h->root.type == bfd_link_hash_warning)
 615             h = (struct elf_link_hash_entry *) h->root.u.i.link;
 616         }
 617
 618       switch (ELF32_R_TYPE (rel->r_info))
 619         {
 620         /* This relocation describes the C++ object vtable hierarchy.
 621            Reconstruct it for later use during GC.  */
 622         case R_MCORE_GNU_VTINHERIT:
 623           if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
 624             return FALSE;
 625           break;
 626
 627         /* This relocation describes which C++ vtable entries are actually
 628            used.  Record for later use during GC.  */
 629         case R_MCORE_GNU_VTENTRY:
 630           BFD_ASSERT (h != NULL);
 631           if (h != NULL
 632               && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
 633             return FALSE;
 634           break;
 635         }
 636     }
 637
 638   return TRUE;
 639 }
 640
 641 static const struct bfd_elf_special_section mcore_elf_special_sections[]=
 642 {
 643   { STRING_COMMA_LEN (".ctors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 644   { STRING_COMMA_LEN (".dtors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 645   { NULL,                     0,  0, 0,            0 }
 646 };
 647
 648 #define TARGET_BIG_SYM          bfd_elf32_mcore_big_vec
 649 #define TARGET_BIG_NAME         "elf32-mcore-big"
 650 #define TARGET_LITTLE_SYM       bfd_elf32_mcore_little_vec
 651 #define TARGET_LITTLE_NAME      "elf32-mcore-little"
 652
 653 #define ELF_ARCH                bfd_arch_mcore
 654 #define ELF_MACHINE_CODE        EM_MCORE
 655 #define ELF_MAXPAGESIZE         0x1000          /* 4k, if we ever have 'em */
 656 #define elf_info_to_howto       mcore_elf_info_to_howto
 657 #define elf_info_to_howto_rel   NULL
 658
 659 #define bfd_elf32_bfd_merge_private_bfd_data    mcore_elf_merge_private_bfd_data
 660 #define bfd_elf32_bfd_set_private_flags         mcore_elf_set_private_flags
 661 #define bfd_elf32_bfd_reloc_type_lookup         mcore_elf_reloc_type_lookup
 662 #define bfd_elf32_bfd_reloc_name_lookup mcore_elf_reloc_name_lookup
 663 #define elf_backend_relocate_section            mcore_elf_relocate_section
 664 #define elf_backend_gc_mark_hook                mcore_elf_gc_mark_hook
 665 #define elf_backend_gc_sweep_hook               mcore_elf_gc_sweep_hook
 666 #define elf_backend_check_relocs                mcore_elf_check_relocs
 667 #define elf_backend_special_sections            mcore_elf_special_sections
 668
 669 #define elf_backend_can_gc_sections             1
 670 #define elf_backend_rela_normal                 1
 671
 672 #include "elf32-target.h"