bfd/elf32-mcore.c

   1 /* Motorola MCore specific support for 32-bit ELF
   2    Copyright (C) 1994-2017 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 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, 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 (_("%B: Relocation %s (%d) is not currently supported.\n"),
 101                       abfd,
 102                       reloc_entry->howto->name,
 103                       reloc_entry->howto->type);
 104
 105   return bfd_reloc_notsupported;
 106 }
 107
 108 static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max];
 109
 110 static reloc_howto_type mcore_elf_howto_raw[] =
 111 {
 112   /* This reloc does nothing.  */
 113   HOWTO (R_MCORE_NONE,          /* type */
 114          0,                     /* rightshift */
 115          3,                     /* size (0 = byte, 1 = short, 2 = long) */
 116          0,                     /* bitsize */
 117          FALSE,                 /* pc_relative */
 118          0,                     /* bitpos */
 119          complain_overflow_dont,  /* complain_on_overflow */
 120          NULL,                  /* special_function */
 121          "R_MCORE_NONE",        /* name */
 122          FALSE,                 /* partial_inplace */
 123          0,                     /* src_mask */
 124          0,                     /* dst_mask */
 125          FALSE),                /* pcrel_offset */
 126
 127   /* A standard 32 bit relocation.  */
 128   HOWTO (R_MCORE_ADDR32,        /* type */
 129          0,                     /* rightshift */
 130          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 131          32,                    /* bitsize */
 132          FALSE,                 /* pc_relative */
 133          0,                     /* bitpos */
 134          complain_overflow_bitfield, /* complain_on_overflow */
 135          bfd_elf_generic_reloc, /* special_function */
 136          "ADDR32",              /* name *//* For compatibility with coff/pe port.  */
 137          FALSE,                 /* partial_inplace */
 138          0x0,                   /* src_mask */
 139          0xffffffff,            /* dst_mask */
 140          FALSE),                /* pcrel_offset */
 141
 142   /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
 143      Should not appear in object files.  */
 144   HOWTO (R_MCORE_PCRELIMM8BY4,  /* type */
 145          2,                     /* rightshift */
 146          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 147          8,                     /* bitsize */
 148          TRUE,                  /* pc_relative */
 149          0,                     /* bitpos */
 150          complain_overflow_bitfield, /* complain_on_overflow */
 151          mcore_elf_unsupported_reloc,   /* special_function */
 152          "R_MCORE_PCRELIMM8BY4",/* name */
 153          FALSE,                 /* partial_inplace */
 154          0,                     /* src_mask */
 155          0,                     /* dst_mask */
 156          TRUE),                 /* pcrel_offset */
 157
 158   /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
 159      Span 2k instructions == 4k bytes.
 160      Only useful pieces at the relocated address are the opcode (5 bits) */
 161   HOWTO (R_MCORE_PCRELIMM11BY2,/* type */
 162          1,                     /* rightshift */
 163          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 164          11,                    /* bitsize */
 165          TRUE,                  /* pc_relative */
 166          0,                     /* bitpos */
 167          complain_overflow_signed, /* complain_on_overflow */
 168          bfd_elf_generic_reloc, /* special_function */
 169          "R_MCORE_PCRELIMM11BY2",/* name */
 170          FALSE,                 /* partial_inplace */
 171          0x0,                   /* src_mask */
 172          0x7ff,                 /* dst_mask */
 173          TRUE),                 /* pcrel_offset */
 174
 175   /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported.  */
 176   HOWTO (R_MCORE_PCRELIMM4BY2,  /* type */
 177          1,                     /* rightshift */
 178          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 179          4,                     /* bitsize */
 180          TRUE,                  /* pc_relative */
 181          0,                     /* bitpos */
 182          complain_overflow_bitfield, /* complain_on_overflow */
 183          mcore_elf_unsupported_reloc,/* special_function */
 184          "R_MCORE_PCRELIMM4BY2",/* name */
 185          FALSE,                 /* partial_inplace */
 186          0,                     /* src_mask */
 187          0,                     /* dst_mask */
 188          TRUE),                 /* pcrel_offset */
 189
 190   /* 32-bit pc-relative. Eventually this will help support PIC code.  */
 191   HOWTO (R_MCORE_PCREL32,       /* type */
 192          0,                     /* rightshift */
 193          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 194          32,                    /* bitsize */
 195          TRUE,                  /* pc_relative */
 196          0,                     /* bitpos */
 197          complain_overflow_bitfield, /* complain_on_overflow */
 198          bfd_elf_generic_reloc, /* special_function */
 199          "R_MCORE_PCREL32",     /* name */
 200          FALSE,                 /* partial_inplace */
 201          0x0,                   /* src_mask */
 202          0xffffffff,            /* dst_mask */
 203          TRUE),                 /* pcrel_offset */
 204
 205   /* Like PCRELIMM11BY2, this relocation indicates that there is a
 206      'jsri' at the specified address. There is a separate relocation
 207      entry for the literal pool entry that it references, but we
 208      might be able to change the jsri to a bsr if the target turns out
 209      to be close enough [even though we won't reclaim the literal pool
 210      entry, we'll get some runtime efficiency back]. Note that this
 211      is a relocation that we are allowed to safely ignore.  */
 212   HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */
 213          1,                     /* rightshift */
 214          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 215          11,                    /* bitsize */
 216          TRUE,                  /* pc_relative */
 217          0,                     /* bitpos */
 218          complain_overflow_signed, /* complain_on_overflow */
 219          bfd_elf_generic_reloc, /* special_function */
 220          "R_MCORE_PCRELJSR_IMM11BY2", /* name */
 221          FALSE,                 /* partial_inplace */
 222          0x0,                   /* src_mask */
 223          0x7ff,                 /* dst_mask */
 224          TRUE),                 /* pcrel_offset */
 225
 226   /* GNU extension to record C++ vtable hierarchy.  */
 227   HOWTO (R_MCORE_GNU_VTINHERIT, /* type */
 228          0,                     /* rightshift */
 229          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 230          0,                     /* bitsize */
 231          FALSE,                 /* pc_relative */
 232          0,                     /* bitpos */
 233          complain_overflow_dont, /* complain_on_overflow */
 234          NULL,                  /* special_function */
 235          "R_MCORE_GNU_VTINHERIT", /* name */
 236          FALSE,                 /* partial_inplace */
 237          0,                     /* src_mask */
 238          0,                     /* dst_mask */
 239          FALSE),                /* pcrel_offset */
 240
 241   /* GNU extension to record C++ vtable member usage.  */
 242   HOWTO (R_MCORE_GNU_VTENTRY,   /* type */
 243          0,                     /* rightshift */
 244          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 245          0,                     /* bitsize */
 246          FALSE,                 /* pc_relative */
 247          0,                     /* bitpos */
 248          complain_overflow_dont,/* complain_on_overflow */
 249          _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
 250          "R_MCORE_GNU_VTENTRY", /* name */
 251          FALSE,                 /* partial_inplace */
 252          0,                     /* src_mask */
 253          0,                     /* dst_mask */
 254          FALSE),                /* pcrel_offset */
 255
 256   HOWTO (R_MCORE_RELATIVE,      /* type */
 257          0,                     /* rightshift */
 258          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 259          32,                    /* bitsize */
 260          FALSE,                 /* pc_relative */
 261          0,                     /* bitpos */
 262          complain_overflow_signed, /* complain_on_overflow */
 263          NULL,                  /* special_function */
 264          "R_MCORE_RELATIVE",    /* name */
 265          TRUE,                  /* partial_inplace */
 266          0xffffffff,            /* src_mask */
 267          0xffffffff,            /* dst_mask */
 268          FALSE)                 /* pcrel_offset */
 269 };
 270
 271 #ifndef NUM_ELEM
 272 #define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
 273 #endif
 274 \f
 275 /* Initialize the mcore_elf_howto_table, so that linear accesses can be done.  */
 276 static void
 277 mcore_elf_howto_init (void)
 278 {
 279   unsigned int i;
 280
 281   for (i = NUM_ELEM (mcore_elf_howto_raw); i--;)
 282     {
 283       unsigned int type;
 284
 285       type = mcore_elf_howto_raw[i].type;
 286
 287       BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table));
 288
 289       mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i];
 290     }
 291 }
 292 \f
 293 static reloc_howto_type *
 294 mcore_elf_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
 295                              bfd_reloc_code_real_type code)
 296 {
 297   enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE;
 298
 299   switch (code)
 300     {
 301     case BFD_RELOC_NONE:                     mcore_reloc = R_MCORE_NONE; break;
 302     case BFD_RELOC_32:                       mcore_reloc = R_MCORE_ADDR32; break;
 303     case BFD_RELOC_MCORE_PCREL_IMM8BY4:      mcore_reloc = R_MCORE_PCRELIMM8BY4; break;
 304     case BFD_RELOC_MCORE_PCREL_IMM11BY2:     mcore_reloc = R_MCORE_PCRELIMM11BY2; break;
 305     case BFD_RELOC_MCORE_PCREL_IMM4BY2:      mcore_reloc = R_MCORE_PCRELIMM4BY2; break;
 306     case BFD_RELOC_32_PCREL:                 mcore_reloc = R_MCORE_PCREL32; break;
 307     case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break;
 308     case BFD_RELOC_VTABLE_INHERIT:           mcore_reloc = R_MCORE_GNU_VTINHERIT; break;
 309     case BFD_RELOC_VTABLE_ENTRY:             mcore_reloc = R_MCORE_GNU_VTENTRY; break;
 310     case BFD_RELOC_RVA:                      mcore_reloc = R_MCORE_RELATIVE; break;
 311     default:
 312       return NULL;
 313     }
 314
 315   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
 316     /* Initialize howto table if needed.  */
 317     mcore_elf_howto_init ();
 318
 319   return mcore_elf_howto_table [(int) mcore_reloc];
 320 };
 321
 322 static reloc_howto_type *
 323 mcore_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 324                              const char *r_name)
 325 {
 326   unsigned int i;
 327
 328   for (i = 0;
 329        i < sizeof (mcore_elf_howto_raw) / sizeof (mcore_elf_howto_raw[0]);
 330        i++)
 331     if (mcore_elf_howto_raw[i].name != NULL
 332         && strcasecmp (mcore_elf_howto_raw[i].name, r_name) == 0)
 333       return &mcore_elf_howto_raw[i];
 334
 335   return NULL;
 336 }
 337
 338 /* Set the howto pointer for a RCE ELF reloc.  */
 339
 340 static void
 341 mcore_elf_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
 342                          arelent * cache_ptr,
 343                          Elf_Internal_Rela * dst)
 344 {
 345   unsigned int r_type;
 346
 347   if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
 348     /* Initialize howto table if needed.  */
 349     mcore_elf_howto_init ();
 350
 351   r_type = ELF32_R_TYPE (dst->r_info);
 352   if (r_type >= R_MCORE_max)
 353     {
 354       /* xgettext:c-format */
 355       _bfd_error_handler (_("%B: unrecognised MCore reloc number: %d"),
 356                           abfd, r_type);
 357       bfd_set_error (bfd_error_bad_value);
 358       r_type = R_MCORE_NONE;
 359     }
 360
 361   cache_ptr->howto = mcore_elf_howto_table [r_type];
 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 bfd_boolean
 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   bfd_boolean ret = TRUE;
 408
 409 #ifdef DEBUG
 410   _bfd_error_handler
 411     ("mcore_elf_relocate_section called for %B section %A, %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 (_("%B: Unknown relocation type %d\n"),
 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 (_("%B: Relocation %s (%d) is not currently supported.\n"),
 456                               input_bfd,
 457                               howto->name,
 458                               (int)r_type);
 459
 460           bfd_set_error (bfd_error_bad_value);
 461           ret = FALSE;
 462           continue;
 463         }
 464
 465       if (r_symndx < symtab_hdr->sh_info)
 466         {
 467           sym = local_syms + r_symndx;
 468           sec = local_sections [r_symndx];
 469           relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
 470           addend = rel->r_addend;
 471         }
 472       else
 473         {
 474           bfd_boolean unresolved_reloc, warned, ignored;
 475
 476           RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
 477                                    r_symndx, symtab_hdr, sym_hashes,
 478                                    h, sec, relocation,
 479                                    unresolved_reloc, warned, ignored);
 480         }
 481
 482       if (sec != NULL && discarded_section (sec))
 483         RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
 484                                          rel, 1, relend, howto, 0, contents);
 485
 486       if (bfd_link_relocatable (info))
 487         continue;
 488
 489       switch (r_type)
 490         {
 491         default:
 492           break;
 493
 494         case R_MCORE_PCRELJSR_IMM11BY2:
 495           oldinst = bfd_get_16 (input_bfd, contents + offset);
 496 #define MCORE_INST_BSR  0xF800
 497           bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset);
 498           break;
 499         }
 500
 501 #ifdef DEBUG
 502       fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
 503                howto->name, r_type, r_symndx, (long) offset, (long) addend);
 504 #endif
 505
 506       r = _bfd_final_link_relocate
 507         (howto, input_bfd, input_section, contents, offset, relocation, addend);
 508
 509       if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
 510         {
 511           /* Wasn't ok, back it out and give up.  */
 512           bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset);
 513           r = bfd_reloc_ok;
 514         }
 515
 516       if (r != bfd_reloc_ok)
 517         {
 518           ret = FALSE;
 519
 520           switch (r)
 521             {
 522             default:
 523               break;
 524
 525             case bfd_reloc_overflow:
 526               {
 527                 const char * name;
 528
 529                 if (h != NULL)
 530                   name = NULL;
 531                 else
 532                   {
 533                     name = bfd_elf_string_from_elf_section
 534                       (input_bfd, symtab_hdr->sh_link, sym->st_name);
 535
 536                     if (name == NULL)
 537                       break;
 538
 539                     if (* name == '\0')
 540                       name = bfd_section_name (input_bfd, sec);
 541                   }
 542
 543                 (*info->callbacks->reloc_overflow)
 544                   (info, (h ? &h->root : NULL), name, howto->name,
 545                    (bfd_vma) 0, input_bfd, input_section, offset);
 546               }
 547               break;
 548             }
 549         }
 550     }
 551
 552 #ifdef DEBUG
 553   fprintf (stderr, "\n");
 554 #endif
 555
 556   return ret;
 557 }
 558 \f
 559 /* Return the section that should be marked against GC for a given
 560    relocation.  */
 561
 562 static asection *
 563 mcore_elf_gc_mark_hook (asection *sec,
 564                         struct bfd_link_info *info,
 565                         Elf_Internal_Rela *rel,
 566                         struct elf_link_hash_entry *h,
 567                         Elf_Internal_Sym *sym)
 568 {
 569   if (h != NULL)
 570     switch (ELF32_R_TYPE (rel->r_info))
 571       {
 572       case R_MCORE_GNU_VTINHERIT:
 573       case R_MCORE_GNU_VTENTRY:
 574         return NULL;
 575       }
 576
 577   return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
 578 }
 579
 580 /* Look through the relocs for a section during the first phase.
 581    Since we don't do .gots or .plts, we just need to consider the
 582    virtual table relocs for gc.  */
 583
 584 static bfd_boolean
 585 mcore_elf_check_relocs (bfd * abfd,
 586                         struct bfd_link_info * info,
 587                         asection * sec,
 588                         const Elf_Internal_Rela * relocs)
 589 {
 590   Elf_Internal_Shdr * symtab_hdr;
 591   struct elf_link_hash_entry ** sym_hashes;
 592   const Elf_Internal_Rela * rel;
 593   const Elf_Internal_Rela * rel_end;
 594
 595   if (bfd_link_relocatable (info))
 596     return TRUE;
 597
 598   symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
 599   sym_hashes = elf_sym_hashes (abfd);
 600
 601   rel_end = relocs + sec->reloc_count;
 602
 603   for (rel = relocs; rel < rel_end; rel++)
 604     {
 605       struct elf_link_hash_entry * h;
 606       unsigned long r_symndx;
 607
 608       r_symndx = ELF32_R_SYM (rel->r_info);
 609
 610       if (r_symndx < symtab_hdr->sh_info)
 611         h = NULL;
 612       else
 613         {
 614           h = sym_hashes [r_symndx - symtab_hdr->sh_info];
 615           while (h->root.type == bfd_link_hash_indirect
 616                  || h->root.type == bfd_link_hash_warning)
 617             h = (struct elf_link_hash_entry *) h->root.u.i.link;
 618
 619           /* PR15323, ref flags aren't set for references in the same
 620              object.  */
 621           h->root.non_ir_ref_regular = 1;
 622         }
 623
 624       switch (ELF32_R_TYPE (rel->r_info))
 625         {
 626         /* This relocation describes the C++ object vtable hierarchy.
 627            Reconstruct it for later use during GC.  */
 628         case R_MCORE_GNU_VTINHERIT:
 629           if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
 630             return FALSE;
 631           break;
 632
 633         /* This relocation describes which C++ vtable entries are actually
 634            used.  Record for later use during GC.  */
 635         case R_MCORE_GNU_VTENTRY:
 636           BFD_ASSERT (h != NULL);
 637           if (h != NULL
 638               && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
 639             return FALSE;
 640           break;
 641         }
 642     }
 643
 644   return TRUE;
 645 }
 646
 647 static const struct bfd_elf_special_section mcore_elf_special_sections[]=
 648 {
 649   { STRING_COMMA_LEN (".ctors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 650   { STRING_COMMA_LEN (".dtors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
 651   { NULL,                     0,  0, 0,            0 }
 652 };
 653
 654 #define TARGET_BIG_SYM          mcore_elf32_be_vec
 655 #define TARGET_BIG_NAME         "elf32-mcore-big"
 656 #define TARGET_LITTLE_SYM       mcore_elf32_le_vec
 657 #define TARGET_LITTLE_NAME      "elf32-mcore-little"
 658
 659 #define ELF_ARCH                bfd_arch_mcore
 660 #define ELF_MACHINE_CODE        EM_MCORE
 661 #define ELF_MAXPAGESIZE         0x1000          /* 4k, if we ever have 'em */
 662 #define elf_info_to_howto       mcore_elf_info_to_howto
 663 #define elf_info_to_howto_rel   NULL
 664
 665 #define bfd_elf32_bfd_merge_private_bfd_data    mcore_elf_merge_private_bfd_data
 666 #define bfd_elf32_bfd_set_private_flags         mcore_elf_set_private_flags
 667 #define bfd_elf32_bfd_reloc_type_lookup         mcore_elf_reloc_type_lookup
 668 #define bfd_elf32_bfd_reloc_name_lookup mcore_elf_reloc_name_lookup
 669 #define elf_backend_relocate_section            mcore_elf_relocate_section
 670 #define elf_backend_gc_mark_hook                mcore_elf_gc_mark_hook
 671 #define elf_backend_check_relocs                mcore_elf_check_relocs
 672 #define elf_backend_special_sections            mcore_elf_special_sections
 673
 674 #define elf_backend_can_gc_sections             1
 675 #define elf_backend_rela_normal                 1
 676
 677 #include "elf32-target.h"