bfd/elf32-mcore.c

   1 /* Motorola MCore specific support for 32-bit ELF
   2    Copyright (C) 1994-2021 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  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 "sysdep.h"
  26 #include "bfd.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 bool
  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 bool
  52 mcore_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
  53 {
  54   bfd *obfd = info->output_bfd;
  55   flagword old_flags;
  56   flagword new_flags;
  57
  58   /* Check if we have the same endianness.  */
  59   if (! _bfd_generic_verify_endian_match (ibfd, info))
  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                              void * 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   /* xgettext:c-format */
 100   _bfd_error_handler (_("%pB: %s unsupported"),
 101                       abfd,
 102                       reloc_entry->howto->name);
 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          3,                     /* size (0 = byte, 1 = short, 2 = long) */
 115          0,                     /* bitsize */
 116          false,                 /* pc_relative */
 117          0,                     /* bitpos */
 118          complain_overflow_dont,  /* 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 bool
 340 mcore_elf_info_to_howto (bfd * abfd,
 341                          arelent * cache_ptr,
 342                          Elf_Internal_Rela * dst)
 343 {
 344   unsigned int r_type;
 345
 346   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
 347     /* Initialize howto table if needed.  */
 348     mcore_elf_howto_init ();
 349
 350   r_type = ELF32_R_TYPE (dst->r_info);
 351   if (r_type >= R_MCORE_max)
 352     {
 353       /* xgettext:c-format */
 354       _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
 355                           abfd, r_type);
 356       bfd_set_error (bfd_error_bad_value);
 357       return false;
 358     }
 359
 360   cache_ptr->howto = mcore_elf_howto_table [r_type];
 361   return true;
 362 }
 363 \f
 364 /* The RELOCATE_SECTION function is called by the ELF backend linker
 365    to handle the relocations for a section.
 366
 367    The relocs are always passed as Rela structures; if the section
 368    actually uses Rel structures, the r_addend field will always be
 369    zero.
 370
 371    This function is responsible for adjust the section contents as
 372    necessary, and (if using Rela relocs and generating a
 373    relocatable output file) adjusting the reloc addend as
 374    necessary.
 375
 376    This function does not have to worry about setting the reloc
 377    address or the reloc symbol index.
 378
 379    LOCAL_SYMS is a pointer to the swapped in local symbols.
 380
 381    LOCAL_SECTIONS is an array giving the section in the input file
 382    corresponding to the st_shndx field of each local symbol.
 383
 384    The global hash table entry for the global symbols can be found
 385    via elf_sym_hashes (input_bfd).
 386
 387    When generating relocatable output, this function must handle
 388    STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 389    going to be the section symbol corresponding to the output
 390    section, which means that the addend must be adjusted
 391    accordingly.  */
 392
 393 static int
 394 mcore_elf_relocate_section (bfd * output_bfd,
 395                             struct bfd_link_info * info,
 396                             bfd * input_bfd,
 397                             asection * input_section,
 398                             bfd_byte * contents,
 399                             Elf_Internal_Rela * relocs,
 400                             Elf_Internal_Sym * local_syms,
 401                             asection ** local_sections)
 402 {
 403   Elf_Internal_Shdr * symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
 404   struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
 405   Elf_Internal_Rela * rel = relocs;
 406   Elf_Internal_Rela * relend = relocs + input_section->reloc_count;
 407   bool ret = true;
 408
 409 #ifdef DEBUG
 410   _bfd_error_handler
 411     ("mcore_elf_relocate_section called for %pB section %pA, %u relocations%s",
 412      input_bfd,
 413      input_section,
 414      input_section->reloc_count,
 415      (bfd_link_relocatable (info)) ? " (relocatable)" : "");
 416 #endif
 417
 418   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])   /* Initialize howto table if needed */
 419     mcore_elf_howto_init ();
 420
 421   for (; rel < relend; rel++)
 422     {
 423       enum elf_mcore_reloc_type    r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
 424       bfd_vma                      offset = rel->r_offset;
 425       bfd_vma                      addend = rel->r_addend;
 426       bfd_reloc_status_type        r = bfd_reloc_other;
 427       asection *                   sec = NULL;
 428       reloc_howto_type *           howto;
 429       bfd_vma                      relocation;
 430       Elf_Internal_Sym *           sym = NULL;
 431       unsigned long                r_symndx;
 432       struct elf_link_hash_entry * h = NULL;
 433       unsigned short               oldinst = 0;
 434
 435       /* Unknown relocation handling.  */
 436       if ((unsigned) r_type >= (unsigned) R_MCORE_max
 437           || ! mcore_elf_howto_table [(int)r_type])
 438         {
 439           /* xgettext:c-format */
 440           _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
 441                               input_bfd, (int) r_type);
 442
 443           bfd_set_error (bfd_error_bad_value);
 444           ret = false;
 445           continue;
 446         }
 447
 448       howto = mcore_elf_howto_table [(int) r_type];
 449       r_symndx = ELF32_R_SYM (rel->r_info);
 450
 451       /* Complain about known relocation that are not yet supported.  */
 452       if (howto->special_function == mcore_elf_unsupported_reloc)
 453         {
 454           /* xgettext:c-format */
 455           _bfd_error_handler (_("%pB: %s unsupported"),
 456                               input_bfd,
 457                               howto->name);
 458
 459           bfd_set_error (bfd_error_bad_value);
 460           ret = false;
 461           continue;
 462         }
 463
 464       if (r_symndx < symtab_hdr->sh_info)
 465         {
 466           sym = local_syms + r_symndx;
 467           sec = local_sections [r_symndx];
 468           relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
 469           addend = rel->r_addend;
 470         }
 471       else
 472         {
 473           bool unresolved_reloc, warned, ignored;
 474
 475           RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
 476                                    r_symndx, symtab_hdr, sym_hashes,
 477                                    h, sec, relocation,
 478                                    unresolved_reloc, warned, ignored);
 479         }
 480
 481       if (sec != NULL && discarded_section (sec))
 482         RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
 483                                          rel, 1, relend, howto, 0, contents);
 484
 485       if (bfd_link_relocatable (info))
 486         continue;
 487
 488       switch (r_type)
 489         {
 490         default:
 491           break;
 492
 493         case R_MCORE_PCRELJSR_IMM11BY2:
 494           oldinst = bfd_get_16 (input_bfd, contents + offset);
 495 #define MCORE_INST_BSR  0xF800
 496           bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset);
 497           break;
 498         }
 499
 500 #ifdef DEBUG
 501       fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
 502                howto->name, r_type, r_symndx, (long) offset, (long) addend);
 503 #endif
 504
 505       r = _bfd_final_link_relocate
 506         (howto, input_bfd, input_section, contents, offset, relocation, addend);
 507
 508       if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
 509         {
 510           /* Wasn't ok, back it out and give up.  */
 511           bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset);
 512           r = bfd_reloc_ok;
 513         }
 514
 515       if (r != bfd_reloc_ok)
 516         {
 517           ret = false;
 518
 519           switch (r)
 520             {
 521             default:
 522               break;
 523
 524             case bfd_reloc_overflow:
 525               {
 526                 const char * name;
 527
 528                 if (h != NULL)
 529                   name = NULL;
 530                 else
 531                   {
 532                     name = bfd_elf_string_from_elf_section
 533                       (input_bfd, symtab_hdr->sh_link, sym->st_name);
 534
 535                     if (name == NULL)
 536                       break;
 537
 538                     if (* name == '\0')
 539                       name = bfd_section_name (sec);
 540                   }
 541
 542                 (*info->callbacks->reloc_overflow)
 543                   (info, (h ? &h->root : NULL), name, howto->name,
 544                    (bfd_vma) 0, input_bfd, input_section, offset);
 545               }
 546               break;
 547             }
 548         }
 549     }
 550
 551 #ifdef DEBUG
 552   fprintf (stderr, "\n");
 553 #endif
 554
 555   return ret;
 556 }
 557 \f
 558 /* Return the section that should be marked against GC for a given
 559    relocation.  */
 560
 561 static asection *
 562 mcore_elf_gc_mark_hook (asection *sec,
 563                         struct bfd_link_info *info,
 564                         Elf_Internal_Rela *rel,
 565                         struct elf_link_hash_entry *h,
 566                         Elf_Internal_Sym *sym)
 567 {
 568   if (h != NULL)
 569     switch (ELF32_R_TYPE (rel->r_info))
 570       {
 571       case R_MCORE_GNU_VTINHERIT:
 572       case R_MCORE_GNU_VTENTRY:
 573         return NULL;
 574       }
 575
 576   return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
 577 }
 578
 579 /* Look through the relocs for a section during the first phase.
 580    Since we don't do .gots or .plts, we just need to consider the
 581    virtual table relocs for gc.  */
 582
 583 static bool
 584 mcore_elf_check_relocs (bfd * abfd,
 585                         struct bfd_link_info * info,
 586                         asection * sec,
 587                         const Elf_Internal_Rela * relocs)
 588 {
 589   Elf_Internal_Shdr * symtab_hdr;
 590   struct elf_link_hash_entry ** sym_hashes;
 591   const Elf_Internal_Rela * rel;
 592   const Elf_Internal_Rela * rel_end;
 593
 594   if (bfd_link_relocatable (info))
 595     return true;
 596
 597   symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
 598   sym_hashes = elf_sym_hashes (abfd);
 599
 600   rel_end = relocs + sec->reloc_count;
 601
 602   for (rel = relocs; rel < rel_end; rel++)
 603     {
 604       struct elf_link_hash_entry * h;
 605       unsigned long r_symndx;
 606
 607       r_symndx = ELF32_R_SYM (rel->r_info);
 608
 609       if (r_symndx < symtab_hdr->sh_info)
 610         h = NULL;
 611       else
 612         {
 613           h = sym_hashes [r_symndx - symtab_hdr->sh_info];
 614           while (h->root.type == bfd_link_hash_indirect
 615                  || h->root.type == bfd_link_hash_warning)
 616             h = (struct elf_link_hash_entry *) h->root.u.i.link;
 617         }
 618
 619       switch (ELF32_R_TYPE (rel->r_info))
 620         {
 621         /* This relocation describes the C++ object vtable hierarchy.
 622            Reconstruct it for later use during GC.  */
 623         case R_MCORE_GNU_VTINHERIT:
 624           if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
 625             return false;
 626           break;
 627
 628         /* This relocation describes which C++ vtable entries are actually
 629            used.  Record for later use during GC.  */
 630         case R_MCORE_GNU_VTENTRY:
 631           if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
 632             return false;
 633           break;
 634         }
 635     }
 636
 637   return true;
 638 }
 639
 640 static const struct bfd_elf_special_section mcore_elf_special_sections[]=
 641 {
 642   { STRING_COMMA_LEN (".ctors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 643   { STRING_COMMA_LEN (".dtors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 644   { NULL,                     0,  0, 0,            0 }
 645 };
 646
 647 #define TARGET_BIG_SYM          mcore_elf32_be_vec
 648 #define TARGET_BIG_NAME         "elf32-mcore-big"
 649 #define TARGET_LITTLE_SYM       mcore_elf32_le_vec
 650 #define TARGET_LITTLE_NAME      "elf32-mcore-little"
 651
 652 #define ELF_ARCH                bfd_arch_mcore
 653 #define ELF_MACHINE_CODE        EM_MCORE
 654 #define ELF_MAXPAGESIZE         0x1000          /* 4k, if we ever have 'em */
 655 #define elf_info_to_howto       mcore_elf_info_to_howto
 656 #define elf_info_to_howto_rel   NULL
 657
 658 #define bfd_elf32_bfd_merge_private_bfd_data    mcore_elf_merge_private_bfd_data
 659 #define bfd_elf32_bfd_set_private_flags         mcore_elf_set_private_flags
 660 #define bfd_elf32_bfd_reloc_type_lookup         mcore_elf_reloc_type_lookup
 661 #define bfd_elf32_bfd_reloc_name_lookup mcore_elf_reloc_name_lookup
 662 #define elf_backend_relocate_section            mcore_elf_relocate_section
 663 #define elf_backend_gc_mark_hook                mcore_elf_gc_mark_hook
 664 #define elf_backend_check_relocs                mcore_elf_check_relocs
 665 #define elf_backend_special_sections            mcore_elf_special_sections
 666
 667 #define elf_backend_can_gc_sections             1
 668 #define elf_backend_rela_normal                 1
 669
 670 #include "elf32-target.h"