bfd/elf32-openrisc.c

   1 /* OpenRISC-specific support for 32-bit ELF.
   2    Copyright 2001 Free Software Foundation, Inc.
   3    Contributed by Johan Rydberg, jrydberg@opencores.org
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24 #include "elf-bfd.h"
  25 #include "elf/openrisc.h"
  26 #include "libiberty.h"
  27
  28 /* Forward declarations.  */
  29
  30 static reloc_howto_type *openrisc_reloc_type_lookup
  31   PARAMS ((bfd * , bfd_reloc_code_real_type));
  32 static void openrisc_info_to_howto_rela
  33   PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
  34 static boolean openrisc_elf_relocate_section
  35   PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
  36            Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
  37 static bfd_reloc_status_type openrisc_final_link_relocate
  38   PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
  39            Elf_Internal_Rela *, bfd_vma));
  40 static boolean openrisc_elf_gc_sweep_hook
  41   PARAMS ((bfd *, struct bfd_link_info *, asection *,
  42            const Elf_Internal_Rela *));
  43 static asection * openrisc_elf_gc_mark_hook
  44   PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
  45            struct elf_link_hash_entry *, Elf_Internal_Sym *));
  46 static boolean openrisc_elf_check_relocs
  47   PARAMS ((bfd *, struct bfd_link_info *, asection *,
  48            const Elf_Internal_Rela *));
  49 static boolean openrisc_elf_object_p
  50   PARAMS ((bfd *));
  51 static void openrisc_elf_final_write_processing
  52   PARAMS ((bfd *, boolean));
  53
  54
  55 static reloc_howto_type openrisc_elf_howto_table[] =
  56   {
  57   /* This reloc does nothing.  */
  58   HOWTO (R_OPENRISC_NONE,       /* type */
  59          0,                     /* rightshift */
  60          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  61          32,                    /* bitsize */
  62          false,                 /* pc_relative */
  63          0,                     /* bitpos */
  64          complain_overflow_bitfield, /* complain_on_overflow */
  65          bfd_elf_generic_reloc, /* special_function */
  66          "R_OPENRISC_NONE",     /* name */
  67          false,                 /* partial_inplace */
  68          0,                     /* src_mask */
  69          0,                     /* dst_mask */
  70          false),                /* pcrel_offset */
  71
  72   /* A PC relative 26 bit relocation, right shifted by 2.  */
  73   HOWTO (R_OPENRISC_INSN_REL_26, /* type */
  74          2,                     /* rightshift */
  75          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  76          26,                    /* bitsize */
  77          true,                  /* pc_relative */
  78          0,                     /* bitpos */
  79          complain_overflow_signed, /* complain_on_overflow */
  80          bfd_elf_generic_reloc, /* special_function */
  81          "R_OPENRISC_INSN_REL_26", /* name */
  82          false,                 /* partial_inplace */
  83          0x00000000,            /* src_mask */
  84          0x03ffffff,            /* dst_mask */
  85          false),                /* pcrel_offset */
  86
  87   /* A absolute 26 bit relocation, right shifted by 2.  */
  88   HOWTO (R_OPENRISC_INSN_ABS_26, /* type */
  89          2,                     /* rightshift */
  90          2,                     /* size (0 = byte, 1 = short, 2 = long) */
  91          26,                    /* bitsize */
  92          false,                 /* pc_relative */
  93          0,                     /* bitpos */
  94          complain_overflow_signed, /* complain_on_overflow */
  95          bfd_elf_generic_reloc, /* special_function */
  96          "R_OPENRISC_INSN_ABS_26", /* name */
  97          false,                 /* partial_inplace */
  98          0x00000000,            /* src_mask */
  99          0x03ffffff,            /* dst_mask */
 100          false),                /* pcrel_offset */
 101
 102   HOWTO (R_OPENRISC_LO_16_IN_INSN, /* type */
 103          0,                     /* rightshift */
 104          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 105          16,                    /* bitsize */
 106          false,                 /* pc_relative */
 107          0,                     /* bitpos */
 108          complain_overflow_dont, /* complain_on_overflow */
 109          bfd_elf_generic_reloc, /* special_function */
 110          "R_OPENRISC_LO_16_IN_INSN", /* name */
 111          false,                 /* partial_inplace */
 112          0,                     /* src_mask */
 113          0x0000ffff,            /* dst_mask */
 114          false),                /* pcrel_offset */
 115
 116   HOWTO (R_OPENRISC_HI_16_IN_INSN, /* type */
 117          16,                    /* rightshift */
 118          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 119          16,                    /* bitsize */
 120          false,                 /* pc_relative */
 121          0,                     /* bitpos */
 122          complain_overflow_dont,        /* complain_on_overflow */
 123          bfd_elf_generic_reloc, /* special_function */
 124          "R_OPENRISC_HI_16_IN_INSN",    /* name */
 125          false,                 /* partial_inplace */
 126          0,                     /* src_mask */
 127          0x0000ffff,            /* dst_mask */
 128          false),                /* pcrel_offset */
 129
 130   /* An 8 bit absolute relocation.  */
 131   HOWTO (R_OPENRISC_8,          /* type */
 132          0,                     /* rightshift */
 133          0,                     /* size (0 = byte, 1 = short, 2 = long) */
 134          8,                     /* bitsize */
 135          false,                 /* pc_relative */
 136          0,                     /* bitpos */
 137          complain_overflow_bitfield, /* complain_on_overflow */
 138          bfd_elf_generic_reloc, /* special_function */
 139          "R_OPENRISC_8",        /* name */
 140          true,                  /* partial_inplace */
 141          0x0000,                /* src_mask */
 142          0x00ff,                /* dst_mask */
 143          false),                /* pcrel_offset */
 144
 145   /* A 16 bit absolute relocation.  */
 146   HOWTO (R_OPENRISC_16,         /* type */
 147          0,                     /* rightshift */
 148          1,                     /* size (0 = byte, 1 = short, 2 = long) */
 149          16,                    /* bitsize */
 150          false,                 /* pc_relative */
 151          0,                     /* bitpos */
 152          complain_overflow_bitfield, /* complain_on_overflow */
 153          bfd_elf_generic_reloc, /* special_function */
 154          "R_OPENRISC_16",       /* name */
 155          true,                  /* partial_inplace */
 156          0x00000000,            /* src_mask */
 157          0x0000ffff,            /* dst_mask */
 158          false),                /* pcrel_offset */
 159
 160   /* A 32 bit absolute relocation.  */
 161   HOWTO (R_OPENRISC_32,         /* type */
 162          0,                     /* rightshift */
 163          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 164          32,                    /* bitsize */
 165          false,                 /* pc_relative */
 166          0,                     /* bitpos */
 167          complain_overflow_bitfield, /* complain_on_overflow */
 168          bfd_elf_generic_reloc, /* special_function */
 169          "R_OPENRISC_32",       /* name */
 170          true,                  /* partial_inplace */
 171          0x00000000,            /* src_mask */
 172          0xffffffff,            /* dst_mask */
 173          false),                /* pcrel_offset */
 174
 175   /* GNU extension to record C++ vtable hierarchy */
 176   HOWTO (R_OPENRISC_GNU_VTINHERIT, /* type */
 177          0,                     /* rightshift */
 178          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 179          0,                     /* bitsize */
 180          false,                 /* pc_relative */
 181          0,                     /* bitpos */
 182          complain_overflow_dont, /* complain_on_overflow */
 183          NULL,                  /* special_function */
 184          "R_OPENRISC_GNU_VTINHERIT", /* name */
 185          false,                 /* partial_inplace */
 186          0,                     /* src_mask */
 187          0,                     /* dst_mask */
 188          false),                /* pcrel_offset */
 189
 190   /* GNU extension to record C++ vtable member usage */
 191   HOWTO (R_OPENRISC_GNU_VTENTRY, /* type */
 192          0,                     /* rightshift */
 193          2,                     /* size (0 = byte, 1 = short, 2 = long) */
 194          0,                     /* bitsize */
 195          false,                 /* pc_relative */
 196          0,                     /* bitpos */
 197          complain_overflow_dont, /* complain_on_overflow */
 198          _bfd_elf_rel_vtable_reloc_fn, /* special_function */
 199          "R_OPENRISC_GNU_VTENTRY", /* name */
 200          false,                 /* partial_inplace */
 201          0,                     /* src_mask */
 202          0,                     /* dst_mask */
 203          false),                /* pcrel_offset */
 204 };
 205
 206 /* Map BFD reloc types to OpenRISC ELF reloc types.  */
 207
 208 struct openrisc_reloc_map
 209   {
 210     bfd_reloc_code_real_type bfd_reloc_val;
 211     unsigned int openrisc_reloc_val;
 212   };
 213
 214 static const struct openrisc_reloc_map openrisc_reloc_map[] =
 215   {
 216     { BFD_RELOC_NONE,           R_OPENRISC_NONE },
 217     { BFD_RELOC_32,             R_OPENRISC_32 },
 218     { BFD_RELOC_16,             R_OPENRISC_16 },
 219     { BFD_RELOC_8,              R_OPENRISC_8 },
 220     { BFD_RELOC_OPENRISC_REL_26,R_OPENRISC_INSN_REL_26 },
 221     { BFD_RELOC_OPENRISC_ABS_26,R_OPENRISC_INSN_ABS_26 },
 222     { BFD_RELOC_HI16,           R_OPENRISC_HI_16_IN_INSN },
 223     { BFD_RELOC_LO16,           R_OPENRISC_LO_16_IN_INSN },
 224     { BFD_RELOC_VTABLE_INHERIT, R_OPENRISC_GNU_VTINHERIT },
 225     { BFD_RELOC_VTABLE_ENTRY,   R_OPENRISC_GNU_VTENTRY }
 226   };
 227
 228 static reloc_howto_type *
 229 openrisc_reloc_type_lookup (abfd, code)
 230      bfd * abfd ATTRIBUTE_UNUSED;
 231      bfd_reloc_code_real_type code;
 232 {
 233   unsigned int i;
 234
 235   for (i = ARRAY_SIZE (openrisc_reloc_map); --i;)
 236     if (openrisc_reloc_map[i].bfd_reloc_val == code)
 237       return & openrisc_elf_howto_table[openrisc_reloc_map[i].
 238                                        openrisc_reloc_val];
 239
 240   return NULL;
 241 }
 242
 243 /* Set the howto pointer for an OpenRISC ELF reloc.  */
 244
 245 static void
 246 openrisc_info_to_howto_rela (abfd, cache_ptr, dst)
 247      bfd * abfd ATTRIBUTE_UNUSED;
 248      arelent * cache_ptr;
 249      Elf32_Internal_Rela * dst;
 250 {
 251   unsigned int r_type;
 252
 253   r_type = ELF32_R_TYPE (dst->r_info);
 254   BFD_ASSERT (r_type < (unsigned int) R_OPENRISC_max);
 255   cache_ptr->howto = & openrisc_elf_howto_table[r_type];
 256 }
 257
 258 /* Perform a single relocation.  By default we use the standard BFD
 259    routines, but a few relocs, we have to do them ourselves.  */
 260
 261 static bfd_reloc_status_type
 262 openrisc_final_link_relocate (howto, input_bfd, input_section, contents, rel,
 263                               relocation)
 264      reloc_howto_type *howto;
 265      bfd *input_bfd;
 266      asection *input_section;
 267      bfd_byte *contents;
 268      Elf_Internal_Rela *rel;
 269      bfd_vma relocation;
 270 {
 271   bfd_reloc_status_type r = bfd_reloc_ok;
 272
 273   switch (howto->type)
 274     {
 275     case R_OPENRISC_LO_16_IN_INSN:
 276       relocation &= 0xffff;
 277       r = _bfd_final_link_relocate (howto, input_bfd, input_section,
 278                                     contents, rel->r_offset,
 279                                     relocation, rel->r_addend);
 280       break;
 281
 282     default:
 283       r = _bfd_final_link_relocate (howto, input_bfd, input_section,
 284                                     contents, rel->r_offset,
 285                                     relocation, rel->r_addend);
 286     }
 287
 288   return r;
 289 }
 290
 291 /* Relocate an OpenRISC ELF section.
 292    There is some attempt to make this function usable for many architectures,
 293    both USE_REL and USE_RELA ['twould be nice if such a critter existed],
 294    if only to serve as a learning tool.
 295
 296    The RELOCATE_SECTION function is called by the new ELF backend linker
 297    to handle the relocations for a section.
 298
 299    The relocs are always passed as Rela structures; if the section
 300    actually uses Rel structures, the r_addend field will always be
 301    zero.
 302
 303    This function is responsible for adjusting the section contents as
 304    necessary, and (if using Rela relocs and generating a relocateable
 305    output file) adjusting the reloc addend as necessary.
 306
 307    This function does not have to worry about setting the reloc
 308    address or the reloc symbol index.
 309
 310    LOCAL_SYMS is a pointer to the swapped in local symbols.
 311
 312    LOCAL_SECTIONS is an array giving the section in the input file
 313    corresponding to the st_shndx field of each local symbol.
 314
 315    The global hash table entry for the global symbols can be found
 316    via elf_sym_hashes (input_bfd).
 317
 318    When generating relocateable output, this function must handle
 319    STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 320    going to be the section symbol corresponding to the output
 321    section, which means that the addend must be adjusted
 322    accordingly.  */
 323
 324 static boolean
 325 openrisc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
 326                                contents, relocs, local_syms, local_sections)
 327      bfd *output_bfd;
 328      struct bfd_link_info *info;
 329      bfd *input_bfd;
 330      asection *input_section;
 331      bfd_byte *contents;
 332      Elf_Internal_Rela *relocs;
 333      Elf_Internal_Sym *local_syms;
 334      asection **local_sections;
 335 {
 336   Elf_Internal_Shdr *symtab_hdr;
 337   struct elf_link_hash_entry **sym_hashes;
 338   Elf_Internal_Rela *rel;
 339   Elf_Internal_Rela *relend;
 340
 341   symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
 342   sym_hashes = elf_sym_hashes (input_bfd);
 343   relend = relocs + input_section->reloc_count;
 344
 345   for (rel = relocs; rel < relend; rel++)
 346     {
 347       reloc_howto_type *howto;
 348       unsigned long r_symndx;
 349       Elf_Internal_Sym *sym;
 350       asection *sec;
 351       struct elf_link_hash_entry *h;
 352       bfd_vma relocation;
 353       bfd_reloc_status_type r;
 354       const char *name = NULL;
 355       int r_type;
 356
 357       r_type = ELF32_R_TYPE (rel->r_info);
 358       r_symndx = ELF32_R_SYM (rel->r_info);
 359
 360       if (r_type == R_OPENRISC_GNU_VTINHERIT
 361           || r_type == R_OPENRISC_GNU_VTENTRY)
 362         continue;
 363
 364       if (info->relocateable)
 365         {
 366           /* This is a relocateable link.  We don't have to change
 367              anything, unless the reloc is against a section symbol,
 368              in which case we have to adjust according to where the
 369              section symbol winds up in the output section.  */
 370           if (r_symndx < symtab_hdr->sh_info)
 371             {
 372               sym = local_syms + r_symndx;
 373
 374               if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
 375                 {
 376                   sec = local_sections[r_symndx];
 377                   rel->r_addend += sec->output_offset + sym->st_value;
 378                 }
 379             }
 380           continue;
 381         }
 382
 383       if ((unsigned int) r_type >
 384           (sizeof openrisc_elf_howto_table / sizeof (reloc_howto_type)))
 385         abort ();
 386
 387       /* This is a final link.  */
 388       howto = openrisc_elf_howto_table + ELF32_R_TYPE (rel->r_info);
 389       h = NULL;
 390       sym = NULL;
 391       sec = NULL;
 392
 393       if (r_symndx < symtab_hdr->sh_info)
 394         {
 395           sym = local_syms + r_symndx;
 396           sec = local_sections[r_symndx];
 397           relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
 398
 399           name = bfd_elf_string_from_elf_section
 400             (input_bfd, symtab_hdr->sh_link, sym->st_name);
 401           name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
 402         }
 403       else
 404         {
 405           h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 406
 407           while (h->root.type == bfd_link_hash_indirect
 408                  || h->root.type == bfd_link_hash_warning)
 409             h = (struct elf_link_hash_entry *) h->root.u.i.link;
 410
 411           name = h->root.root.string;
 412
 413           if (h->root.type == bfd_link_hash_defined
 414               || h->root.type == bfd_link_hash_defweak)
 415             {
 416               sec = h->root.u.def.section;
 417               relocation = (h->root.u.def.value
 418                             + sec->output_section->vma + sec->output_offset);
 419             }
 420           else if (h->root.type == bfd_link_hash_undefweak)
 421             {
 422               relocation = 0;
 423             }
 424           else
 425             {
 426               if (!((*info->callbacks->undefined_symbol)
 427                     (info, h->root.root.string, input_bfd,
 428                      input_section, rel->r_offset, true)))
 429                 return false;
 430               relocation = 0;
 431             }
 432         }
 433
 434       r = openrisc_final_link_relocate (howto, input_bfd, input_section,
 435                                         contents, rel, relocation);
 436
 437       if (r != bfd_reloc_ok)
 438         {
 439           const char *msg = (const char *) NULL;
 440
 441           switch (r)
 442             {
 443             case bfd_reloc_overflow:
 444               r = info->callbacks->reloc_overflow
 445                 (info, name, howto->name, (bfd_vma) 0,
 446                  input_bfd, input_section, rel->r_offset);
 447               break;
 448
 449             case bfd_reloc_undefined:
 450               r = info->callbacks->undefined_symbol
 451                 (info, name, input_bfd, input_section, rel->r_offset, true);
 452               break;
 453
 454             case bfd_reloc_outofrange:
 455               msg = _("internal error: out of range error");
 456               break;
 457
 458             case bfd_reloc_notsupported:
 459               msg = _("internal error: unsupported relocation error");
 460               break;
 461
 462             case bfd_reloc_dangerous:
 463               msg = _("internal error: dangerous relocation");
 464               break;
 465
 466             default:
 467               msg = _("internal error: unknown error");
 468               break;
 469             }
 470
 471           if (msg)
 472             r = info->callbacks->warning
 473               (info, msg, name, input_bfd, input_section, rel->r_offset);
 474
 475           if (!r)
 476             return false;
 477         }
 478     }
 479
 480   return true;
 481 }
 482
 483 /* Return the section that should be marked against GC for a given
 484    relocation.  */
 485
 486 static asection *
 487 openrisc_elf_gc_mark_hook (abfd, info, rel, h, sym)
 488      bfd *abfd ATTRIBUTE_UNUSED;
 489      struct bfd_link_info *info ATTRIBUTE_UNUSED;
 490      Elf_Internal_Rela *rel ATTRIBUTE_UNUSED;
 491      struct elf_link_hash_entry *h ATTRIBUTE_UNUSED;
 492      Elf_Internal_Sym *sym ATTRIBUTE_UNUSED;
 493 {
 494   if (h != NULL)
 495     {
 496       switch (ELF32_R_TYPE (rel->r_info))
 497         {
 498         case R_OPENRISC_GNU_VTINHERIT:
 499         case R_OPENRISC_GNU_VTENTRY:
 500           break;
 501
 502         default:
 503           switch (h->root.type)
 504             {
 505             case bfd_link_hash_defined:
 506             case bfd_link_hash_defweak:
 507               return h->root.u.def.section;
 508
 509             case bfd_link_hash_common:
 510               return h->root.u.c.p->section;
 511
 512             default:
 513               break;
 514             }
 515         }
 516     }
 517   else
 518     {
 519       if (!(elf_bad_symtab (abfd)
 520             && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
 521           && !((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
 522                && sym->st_shndx != SHN_COMMON))
 523         {
 524           return bfd_section_from_elf_index (abfd, sym->st_shndx);
 525         }
 526     }
 527
 528   return NULL;
 529 }
 530
 531 /* Update the got entry reference counts for the section being removed.  */
 532
 533 static boolean
 534 openrisc_elf_gc_sweep_hook (abfd, info, sec, relocs)
 535      bfd *abfd ATTRIBUTE_UNUSED;
 536      struct bfd_link_info *info ATTRIBUTE_UNUSED;
 537      asection *sec ATTRIBUTE_UNUSED;
 538      const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
 539 {
 540   return true;
 541 }
 542
 543 /* Look through the relocs for a section during the first phase.
 544    Since we don't do .gots or .plts, we just need to consider the
 545    virtual table relocs for gc.  */
 546
 547 static boolean
 548 openrisc_elf_check_relocs (abfd, info, sec, relocs)
 549      bfd *abfd;
 550      struct bfd_link_info *info;
 551      asection *sec;
 552      const Elf_Internal_Rela *relocs;
 553 {
 554   Elf_Internal_Shdr *symtab_hdr;
 555   struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
 556   const Elf_Internal_Rela *rel;
 557   const Elf_Internal_Rela *rel_end;
 558
 559   if (info->relocateable)
 560     return true;
 561
 562   symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
 563   sym_hashes = elf_sym_hashes (abfd);
 564   sym_hashes_end =
 565     sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
 566   if (!elf_bad_symtab (abfd))
 567     sym_hashes_end -= symtab_hdr->sh_info;
 568
 569   rel_end = relocs + sec->reloc_count;
 570   for (rel = relocs; rel < rel_end; rel++)
 571     {
 572       struct elf_link_hash_entry *h;
 573       unsigned long r_symndx;
 574
 575       r_symndx = ELF32_R_SYM (rel->r_info);
 576       if (r_symndx < symtab_hdr->sh_info)
 577         h = NULL;
 578       else
 579         h = sym_hashes[r_symndx - symtab_hdr->sh_info];
 580
 581       switch (ELF32_R_TYPE (rel->r_info))
 582         {
 583           /* This relocation describes the C++ object vtable hierarchy.
 584              Reconstruct it for later use during GC.  */
 585         case R_OPENRISC_GNU_VTINHERIT:
 586           if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
 587             return false;
 588           break;
 589
 590           /* This relocation describes which C++ vtable entries are actually
 591              used.  Record for later use during GC.  */
 592         case R_OPENRISC_GNU_VTENTRY:
 593           if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
 594             return false;
 595           break;
 596         }
 597     }
 598
 599   return true;
 600 }
 601
 602 /* Set the right machine number.  */
 603
 604 static boolean
 605 openrisc_elf_object_p (abfd)
 606      bfd *abfd;
 607 {
 608   switch (elf_elfheader (abfd)->e_flags & 0xf)
 609     {
 610     default:
 611       (void) bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0);
 612       break;
 613     }
 614   return true;
 615 }
 616
 617 /* Store the machine number in the flags field.  */
 618
 619 static void
 620 openrisc_elf_final_write_processing (abfd, linker)
 621      bfd *abfd;
 622      boolean linker ATTRIBUTE_UNUSED;
 623 {
 624   unsigned long val;
 625
 626   switch (bfd_get_mach (abfd))
 627     {
 628     default:
 629       val = 0;
 630       break;
 631     }
 632
 633   elf_elfheader (abfd)->e_flags &= ~0xf;
 634   elf_elfheader (abfd)->e_flags |= val;
 635 }
 636
 637
 638 #define ELF_ARCH                        bfd_arch_openrisc
 639 #define ELF_MACHINE_CODE                EM_OPENRISC
 640 #define ELF_MACHINE_ALT1                EM_OPENRISC_OLD
 641 #define ELF_MAXPAGESIZE                 0x1000
 642
 643 #define TARGET_BIG_SYM                  bfd_elf32_openrisc_vec
 644 #define TARGET_BIG_NAME                 "elf32-openrisc"
 645
 646 #define elf_info_to_howto_rel           NULL
 647 #define elf_info_to_howto               openrisc_info_to_howto_rela
 648 #define elf_backend_relocate_section    openrisc_elf_relocate_section
 649 #define elf_backend_gc_mark_hook        openrisc_elf_gc_mark_hook
 650 #define elf_backend_gc_sweep_hook       openrisc_elf_gc_sweep_hook
 651 #define elf_backend_check_relocs        openrisc_elf_check_relocs
 652
 653 #define elf_backend_can_gc_sections     1
 654
 655 #define bfd_elf32_bfd_reloc_type_lookup openrisc_reloc_type_lookup
 656
 657 #define elf_backend_object_p                openrisc_elf_object_p
 658 #define elf_backend_final_write_processing  openrisc_elf_final_write_processing
 659
 660 #include "elf32-target.h"