bfd/elf64-sparc.c

   1 /* SPARC-specific support for 64-bit ELF
   2    Copyright (C) 1993-2014 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 #include "sysdep.h"
  22 #include "bfd.h"
  23 #include "libbfd.h"
  24 #include "elf-bfd.h"
  25 #include "elf/sparc.h"
  26 #include "opcode/sparc.h"
  27 #include "elfxx-sparc.h"
  28
  29 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value.  */
  30 #define MINUS_ONE (~ (bfd_vma) 0)
  31
  32 /* Due to the way how we handle R_SPARC_OLO10, each entry in a SHT_RELA
  33    section can represent up to two relocs, we must tell the user to allocate
  34    more space.  */
  35
  36 static long
  37 elf64_sparc_get_reloc_upper_bound (bfd *abfd ATTRIBUTE_UNUSED, asection *sec)
  38 {
  39   return (sec->reloc_count * 2 + 1) * sizeof (arelent *);
  40 }
  41
  42 static long
  43 elf64_sparc_get_dynamic_reloc_upper_bound (bfd *abfd)
  44 {
  45   return _bfd_elf_get_dynamic_reloc_upper_bound (abfd) * 2;
  46 }
  47
  48 /* Read  relocations for ASECT from REL_HDR.  There are RELOC_COUNT of
  49    them.  We cannot use generic elf routines for this,  because R_SPARC_OLO10
  50    has secondary addend in ELF64_R_TYPE_DATA.  We handle it as two relocations
  51    for the same location,  R_SPARC_LO10 and R_SPARC_13.  */
  52
  53 static bfd_boolean
  54 elf64_sparc_slurp_one_reloc_table (bfd *abfd, asection *asect,
  55                                    Elf_Internal_Shdr *rel_hdr,
  56                                    asymbol **symbols, bfd_boolean dynamic)
  57 {
  58   void * allocated = NULL;
  59   bfd_byte *native_relocs;
  60   arelent *relent;
  61   unsigned int i;
  62   int entsize;
  63   bfd_size_type count;
  64   arelent *relents;
  65
  66   allocated = bfd_malloc (rel_hdr->sh_size);
  67   if (allocated == NULL)
  68     goto error_return;
  69
  70   if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0
  71       || bfd_bread (allocated, rel_hdr->sh_size, abfd) != rel_hdr->sh_size)
  72     goto error_return;
  73
  74   native_relocs = (bfd_byte *) allocated;
  75
  76   relents = asect->relocation + canon_reloc_count (asect);
  77
  78   entsize = rel_hdr->sh_entsize;
  79   BFD_ASSERT (entsize == sizeof (Elf64_External_Rela));
  80
  81   count = rel_hdr->sh_size / entsize;
  82
  83   for (i = 0, relent = relents; i < count;
  84        i++, relent++, native_relocs += entsize)
  85     {
  86       Elf_Internal_Rela rela;
  87       unsigned int r_type;
  88
  89       bfd_elf64_swap_reloca_in (abfd, native_relocs, &rela);
  90
  91       /* The address of an ELF reloc is section relative for an object
  92          file, and absolute for an executable file or shared library.
  93          The address of a normal BFD reloc is always section relative,
  94          and the address of a dynamic reloc is absolute..  */
  95       if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic)
  96         relent->address = rela.r_offset;
  97       else
  98         relent->address = rela.r_offset - asect->vma;
  99
 100       if (ELF64_R_SYM (rela.r_info) == STN_UNDEF)
 101         relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 102       else
 103         {
 104           asymbol **ps, *s;
 105
 106           ps = symbols + ELF64_R_SYM (rela.r_info) - 1;
 107           s = *ps;
 108
 109           /* Canonicalize ELF section symbols.  FIXME: Why?  */
 110           if ((s->flags & BSF_SECTION_SYM) == 0)
 111             relent->sym_ptr_ptr = ps;
 112           else
 113             relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
 114         }
 115
 116       relent->addend = rela.r_addend;
 117
 118       r_type = ELF64_R_TYPE_ID (rela.r_info);
 119       if (r_type == R_SPARC_OLO10)
 120         {
 121           relent->howto = _bfd_sparc_elf_info_to_howto_ptr (R_SPARC_LO10);
 122           relent[1].address = relent->address;
 123           relent++;
 124           relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 125           relent->addend = ELF64_R_TYPE_DATA (rela.r_info);
 126           relent->howto = _bfd_sparc_elf_info_to_howto_ptr (R_SPARC_13);
 127         }
 128       else
 129         relent->howto = _bfd_sparc_elf_info_to_howto_ptr (r_type);
 130     }
 131
 132   canon_reloc_count (asect) += relent - relents;
 133
 134   if (allocated != NULL)
 135     free (allocated);
 136
 137   return TRUE;
 138
 139  error_return:
 140   if (allocated != NULL)
 141     free (allocated);
 142   return FALSE;
 143 }
 144
 145 /* Read in and swap the external relocs.  */
 146
 147 static bfd_boolean
 148 elf64_sparc_slurp_reloc_table (bfd *abfd, asection *asect,
 149                                asymbol **symbols, bfd_boolean dynamic)
 150 {
 151   struct bfd_elf_section_data * const d = elf_section_data (asect);
 152   Elf_Internal_Shdr *rel_hdr;
 153   Elf_Internal_Shdr *rel_hdr2;
 154   bfd_size_type amt;
 155
 156   if (asect->relocation != NULL)
 157     return TRUE;
 158
 159   if (! dynamic)
 160     {
 161       if ((asect->flags & SEC_RELOC) == 0
 162           || asect->reloc_count == 0)
 163         return TRUE;
 164
 165       rel_hdr = d->rel.hdr;
 166       rel_hdr2 = d->rela.hdr;
 167
 168       BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset)
 169                   || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset));
 170     }
 171   else
 172     {
 173       /* Note that ASECT->RELOC_COUNT tends not to be accurate in this
 174          case because relocations against this section may use the
 175          dynamic symbol table, and in that case bfd_section_from_shdr
 176          in elf.c does not update the RELOC_COUNT.  */
 177       if (asect->size == 0)
 178         return TRUE;
 179
 180       rel_hdr = &d->this_hdr;
 181       asect->reloc_count = NUM_SHDR_ENTRIES (rel_hdr);
 182       rel_hdr2 = NULL;
 183     }
 184
 185   amt = asect->reloc_count;
 186   amt *= 2 * sizeof (arelent);
 187   asect->relocation = (arelent *) bfd_alloc (abfd, amt);
 188   if (asect->relocation == NULL)
 189     return FALSE;
 190
 191   /* The elf64_sparc_slurp_one_reloc_table routine increments
 192      canon_reloc_count.  */
 193   canon_reloc_count (asect) = 0;
 194
 195   if (rel_hdr
 196       && !elf64_sparc_slurp_one_reloc_table (abfd, asect, rel_hdr, symbols,
 197                                              dynamic))
 198     return FALSE;
 199
 200   if (rel_hdr2
 201       && !elf64_sparc_slurp_one_reloc_table (abfd, asect, rel_hdr2, symbols,
 202                                              dynamic))
 203     return FALSE;
 204
 205   return TRUE;
 206 }
 207
 208 /* Canonicalize the relocs.  */
 209
 210 static long
 211 elf64_sparc_canonicalize_reloc (bfd *abfd, sec_ptr section,
 212                                 arelent **relptr, asymbol **symbols)
 213 {
 214   arelent *tblptr;
 215   unsigned int i;
 216   const struct elf_backend_data *bed = get_elf_backend_data (abfd);
 217
 218   if (! bed->s->slurp_reloc_table (abfd, section, symbols, FALSE))
 219     return -1;
 220
 221   tblptr = section->relocation;
 222   for (i = 0; i < canon_reloc_count (section); i++)
 223     *relptr++ = tblptr++;
 224
 225   *relptr = NULL;
 226
 227   return canon_reloc_count (section);
 228 }
 229
 230
 231 /* Canonicalize the dynamic relocation entries.  Note that we return
 232    the dynamic relocations as a single block, although they are
 233    actually associated with particular sections; the interface, which
 234    was designed for SunOS style shared libraries, expects that there
 235    is only one set of dynamic relocs.  Any section that was actually
 236    installed in the BFD, and has type SHT_REL or SHT_RELA, and uses
 237    the dynamic symbol table, is considered to be a dynamic reloc
 238    section.  */
 239
 240 static long
 241 elf64_sparc_canonicalize_dynamic_reloc (bfd *abfd, arelent **storage,
 242                                         asymbol **syms)
 243 {
 244   asection *s;
 245   long ret;
 246
 247   if (elf_dynsymtab (abfd) == 0)
 248     {
 249       bfd_set_error (bfd_error_invalid_operation);
 250       return -1;
 251     }
 252
 253   ret = 0;
 254   for (s = abfd->sections; s != NULL; s = s->next)
 255     {
 256       if (elf_section_data (s)->this_hdr.sh_link == elf_dynsymtab (abfd)
 257           && (elf_section_data (s)->this_hdr.sh_type == SHT_RELA))
 258         {
 259           arelent *p;
 260           long count, i;
 261
 262           if (! elf64_sparc_slurp_reloc_table (abfd, s, syms, TRUE))
 263             return -1;
 264           count = canon_reloc_count (s);
 265           p = s->relocation;
 266           for (i = 0; i < count; i++)
 267             *storage++ = p++;
 268           ret += count;
 269         }
 270     }
 271
 272   *storage = NULL;
 273
 274   return ret;
 275 }
 276
 277 /* Write out the relocs.  */
 278
 279 static void
 280 elf64_sparc_write_relocs (bfd *abfd, asection *sec, void * data)
 281 {
 282   bfd_boolean *failedp = (bfd_boolean *) data;
 283   Elf_Internal_Shdr *rela_hdr;
 284   bfd_vma addr_offset;
 285   Elf64_External_Rela *outbound_relocas, *src_rela;
 286   unsigned int idx, count;
 287   asymbol *last_sym = 0;
 288   int last_sym_idx = 0;
 289
 290   /* If we have already failed, don't do anything.  */
 291   if (*failedp)
 292     return;
 293
 294   if ((sec->flags & SEC_RELOC) == 0)
 295     return;
 296
 297   /* The linker backend writes the relocs out itself, and sets the
 298      reloc_count field to zero to inhibit writing them here.  Also,
 299      sometimes the SEC_RELOC flag gets set even when there aren't any
 300      relocs.  */
 301   if (sec->reloc_count == 0)
 302     return;
 303
 304   /* We can combine two relocs that refer to the same address
 305      into R_SPARC_OLO10 if first one is R_SPARC_LO10 and the
 306      latter is R_SPARC_13 with no associated symbol.  */
 307   count = 0;
 308   for (idx = 0; idx < sec->reloc_count; idx++)
 309     {
 310       bfd_vma addr;
 311
 312       ++count;
 313
 314       addr = sec->orelocation[idx]->address;
 315       if (sec->orelocation[idx]->howto->type == R_SPARC_LO10
 316           && idx < sec->reloc_count - 1)
 317         {
 318           arelent *r = sec->orelocation[idx + 1];
 319
 320           if (r->howto->type == R_SPARC_13
 321               && r->address == addr
 322               && bfd_is_abs_section ((*r->sym_ptr_ptr)->section)
 323               && (*r->sym_ptr_ptr)->value == 0)
 324             ++idx;
 325         }
 326     }
 327
 328   rela_hdr = elf_section_data (sec)->rela.hdr;
 329
 330   rela_hdr->sh_size = rela_hdr->sh_entsize * count;
 331   rela_hdr->contents = bfd_alloc (abfd, rela_hdr->sh_size);
 332   if (rela_hdr->contents == NULL)
 333     {
 334       *failedp = TRUE;
 335       return;
 336     }
 337
 338   /* Figure out whether the relocations are RELA or REL relocations.  */
 339   if (rela_hdr->sh_type != SHT_RELA)
 340     abort ();
 341
 342   /* The address of an ELF reloc is section relative for an object
 343      file, and absolute for an executable file or shared library.
 344      The address of a BFD reloc is always section relative.  */
 345   addr_offset = 0;
 346   if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
 347     addr_offset = sec->vma;
 348
 349   /* orelocation has the data, reloc_count has the count...  */
 350   outbound_relocas = (Elf64_External_Rela *) rela_hdr->contents;
 351   src_rela = outbound_relocas;
 352
 353   for (idx = 0; idx < sec->reloc_count; idx++)
 354     {
 355       Elf_Internal_Rela dst_rela;
 356       arelent *ptr;
 357       asymbol *sym;
 358       int n;
 359
 360       ptr = sec->orelocation[idx];
 361       sym = *ptr->sym_ptr_ptr;
 362       if (sym == last_sym)
 363         n = last_sym_idx;
 364       else if (bfd_is_abs_section (sym->section) && sym->value == 0)
 365         n = STN_UNDEF;
 366       else
 367         {
 368           last_sym = sym;
 369           n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
 370           if (n < 0)
 371             {
 372               *failedp = TRUE;
 373               return;
 374             }
 375           last_sym_idx = n;
 376         }
 377
 378       if ((*ptr->sym_ptr_ptr)->the_bfd != NULL
 379           && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
 380           && ! _bfd_elf_validate_reloc (abfd, ptr))
 381         {
 382           *failedp = TRUE;
 383           return;
 384         }
 385
 386       if (ptr->howto->type == R_SPARC_LO10
 387           && idx < sec->reloc_count - 1)
 388         {
 389           arelent *r = sec->orelocation[idx + 1];
 390
 391           if (r->howto->type == R_SPARC_13
 392               && r->address == ptr->address
 393               && bfd_is_abs_section ((*r->sym_ptr_ptr)->section)
 394               && (*r->sym_ptr_ptr)->value == 0)
 395             {
 396               idx++;
 397               dst_rela.r_info
 398                 = ELF64_R_INFO (n, ELF64_R_TYPE_INFO (r->addend,
 399                                                       R_SPARC_OLO10));
 400             }
 401           else
 402             dst_rela.r_info = ELF64_R_INFO (n, R_SPARC_LO10);
 403         }
 404       else
 405         dst_rela.r_info = ELF64_R_INFO (n, ptr->howto->type);
 406
 407       dst_rela.r_offset = ptr->address + addr_offset;
 408       dst_rela.r_addend = ptr->addend;
 409
 410       bfd_elf64_swap_reloca_out (abfd, &dst_rela, (bfd_byte *) src_rela);
 411       ++src_rela;
 412     }
 413 }
 414 \f
 415 /* Hook called by the linker routine which adds symbols from an object
 416    file.  We use it for STT_REGISTER symbols.  */
 417
 418 static bfd_boolean
 419 elf64_sparc_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
 420                              Elf_Internal_Sym *sym, const char **namep,
 421                              flagword *flagsp ATTRIBUTE_UNUSED,
 422                              asection **secp ATTRIBUTE_UNUSED,
 423                              bfd_vma *valp ATTRIBUTE_UNUSED)
 424 {
 425   static const char *const stt_types[] = { "NOTYPE", "OBJECT", "FUNCTION" };
 426
 427   if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 428        || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
 429       && (abfd->flags & DYNAMIC) == 0
 430       && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
 431     elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
 432
 433   if (ELF_ST_TYPE (sym->st_info) == STT_REGISTER)
 434     {
 435       int reg;
 436       struct _bfd_sparc_elf_app_reg *p;
 437
 438       reg = (int)sym->st_value;
 439       switch (reg & ~1)
 440         {
 441         case 2: reg -= 2; break;
 442         case 6: reg -= 4; break;
 443         default:
 444           (*_bfd_error_handler)
 445             (_("%B: Only registers %%g[2367] can be declared using STT_REGISTER"),
 446              abfd);
 447           return FALSE;
 448         }
 449
 450       if (info->output_bfd->xvec != abfd->xvec
 451           || (abfd->flags & DYNAMIC) != 0)
 452         {
 453           /* STT_REGISTER only works when linking an elf64_sparc object.
 454              If STT_REGISTER comes from a dynamic object, don't put it into
 455              the output bfd.  The dynamic linker will recheck it.  */
 456           *namep = NULL;
 457           return TRUE;
 458         }
 459
 460       p = _bfd_sparc_elf_hash_table(info)->app_regs + reg;
 461
 462       if (p->name != NULL && strcmp (p->name, *namep))
 463         {
 464           (*_bfd_error_handler)
 465             (_("Register %%g%d used incompatibly: %s in %B, previously %s in %B"),
 466              abfd, p->abfd, (int) sym->st_value,
 467              **namep ? *namep : "#scratch",
 468              *p->name ? p->name : "#scratch");
 469           return FALSE;
 470         }
 471
 472       if (p->name == NULL)
 473         {
 474           if (**namep)
 475             {
 476               struct elf_link_hash_entry *h;
 477
 478               h = (struct elf_link_hash_entry *)
 479                 bfd_link_hash_lookup (info->hash, *namep, FALSE, FALSE, FALSE);
 480
 481               if (h != NULL)
 482                 {
 483                   unsigned char type = h->type;
 484
 485                   if (type > STT_FUNC)
 486                     type = 0;
 487                   (*_bfd_error_handler)
 488                     (_("Symbol `%s' has differing types: REGISTER in %B, previously %s in %B"),
 489                      abfd, p->abfd, *namep, stt_types[type]);
 490                   return FALSE;
 491                 }
 492
 493               p->name = bfd_hash_allocate (&info->hash->table,
 494                                            strlen (*namep) + 1);
 495               if (!p->name)
 496                 return FALSE;
 497
 498               strcpy (p->name, *namep);
 499             }
 500           else
 501             p->name = "";
 502           p->bind = ELF_ST_BIND (sym->st_info);
 503           p->abfd = abfd;
 504           p->shndx = sym->st_shndx;
 505         }
 506       else
 507         {
 508           if (p->bind == STB_WEAK
 509               && ELF_ST_BIND (sym->st_info) == STB_GLOBAL)
 510             {
 511               p->bind = STB_GLOBAL;
 512               p->abfd = abfd;
 513             }
 514         }
 515       *namep = NULL;
 516       return TRUE;
 517     }
 518   else if (*namep && **namep
 519            && info->output_bfd->xvec == abfd->xvec)
 520     {
 521       int i;
 522       struct _bfd_sparc_elf_app_reg *p;
 523
 524       p = _bfd_sparc_elf_hash_table(info)->app_regs;
 525       for (i = 0; i < 4; i++, p++)
 526         if (p->name != NULL && ! strcmp (p->name, *namep))
 527           {
 528             unsigned char type = ELF_ST_TYPE (sym->st_info);
 529
 530             if (type > STT_FUNC)
 531               type = 0;
 532             (*_bfd_error_handler)
 533               (_("Symbol `%s' has differing types: %s in %B, previously REGISTER in %B"),
 534                abfd, p->abfd, *namep, stt_types[type]);
 535             return FALSE;
 536           }
 537     }
 538   return TRUE;
 539 }
 540
 541 /* This function takes care of emitting STT_REGISTER symbols
 542    which we cannot easily keep in the symbol hash table.  */
 543
 544 static bfd_boolean
 545 elf64_sparc_output_arch_syms (bfd *output_bfd ATTRIBUTE_UNUSED,
 546                               struct bfd_link_info *info,
 547                               void * flaginfo,
 548                               int (*func) (void *, const char *,
 549                                            Elf_Internal_Sym *,
 550                                            asection *,
 551                                            struct elf_link_hash_entry *))
 552 {
 553   int reg;
 554   struct _bfd_sparc_elf_app_reg *app_regs =
 555     _bfd_sparc_elf_hash_table(info)->app_regs;
 556   Elf_Internal_Sym sym;
 557
 558   /* We arranged in size_dynamic_sections to put the STT_REGISTER entries
 559      at the end of the dynlocal list, so they came at the end of the local
 560      symbols in the symtab.  Except that they aren't STB_LOCAL, so we need
 561      to back up symtab->sh_info.  */
 562   if (elf_hash_table (info)->dynlocal)
 563     {
 564       bfd * dynobj = elf_hash_table (info)->dynobj;
 565       asection *dynsymsec = bfd_get_linker_section (dynobj, ".dynsym");
 566       struct elf_link_local_dynamic_entry *e;
 567
 568       for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
 569         if (e->input_indx == -1)
 570           break;
 571       if (e)
 572         {
 573           elf_section_data (dynsymsec->output_section)->this_hdr.sh_info
 574             = e->dynindx;
 575         }
 576     }
 577
 578   if (info->strip == strip_all)
 579     return TRUE;
 580
 581   for (reg = 0; reg < 4; reg++)
 582     if (app_regs [reg].name != NULL)
 583       {
 584         if (info->strip == strip_some
 585             && bfd_hash_lookup (info->keep_hash,
 586                                 app_regs [reg].name,
 587                                 FALSE, FALSE) == NULL)
 588           continue;
 589
 590         sym.st_value = reg < 2 ? reg + 2 : reg + 4;
 591         sym.st_size = 0;
 592         sym.st_other = 0;
 593         sym.st_info = ELF_ST_INFO (app_regs [reg].bind, STT_REGISTER);
 594         sym.st_shndx = app_regs [reg].shndx;
 595         sym.st_target_internal = 0;
 596         if ((*func) (flaginfo, app_regs [reg].name, &sym,
 597                      sym.st_shndx == SHN_ABS
 598                      ? bfd_abs_section_ptr : bfd_und_section_ptr,
 599                      NULL) != 1)
 600           return FALSE;
 601       }
 602
 603   return TRUE;
 604 }
 605
 606 static int
 607 elf64_sparc_get_symbol_type (Elf_Internal_Sym *elf_sym, int type)
 608 {
 609   if (ELF_ST_TYPE (elf_sym->st_info) == STT_REGISTER)
 610     return STT_REGISTER;
 611   else
 612     return type;
 613 }
 614
 615 /* A STB_GLOBAL,STT_REGISTER symbol should be BSF_GLOBAL
 616    even in SHN_UNDEF section.  */
 617
 618 static void
 619 elf64_sparc_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym)
 620 {
 621   elf_symbol_type *elfsym;
 622
 623   elfsym = (elf_symbol_type *) asym;
 624   if (elfsym->internal_elf_sym.st_info
 625       == ELF_ST_INFO (STB_GLOBAL, STT_REGISTER))
 626     {
 627       asym->flags |= BSF_GLOBAL;
 628     }
 629 }
 630
 631 \f
 632 /* Functions for dealing with the e_flags field.  */
 633
 634 /* Merge backend specific data from an object file to the output
 635    object file when linking.  */
 636
 637 static bfd_boolean
 638 elf64_sparc_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
 639 {
 640   bfd_boolean error;
 641   flagword new_flags, old_flags;
 642   int new_mm, old_mm;
 643
 644   if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
 645       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
 646     return TRUE;
 647
 648   new_flags = elf_elfheader (ibfd)->e_flags;
 649   old_flags = elf_elfheader (obfd)->e_flags;
 650
 651   if (!elf_flags_init (obfd))   /* First call, no flags set */
 652     {
 653       elf_flags_init (obfd) = TRUE;
 654       elf_elfheader (obfd)->e_flags = new_flags;
 655     }
 656
 657   else if (new_flags == old_flags)      /* Compatible flags are ok */
 658     ;
 659
 660   else                                  /* Incompatible flags */
 661     {
 662       error = FALSE;
 663
 664 #define EF_SPARC_ISA_EXTENSIONS \
 665   (EF_SPARC_SUN_US1 | EF_SPARC_SUN_US3 | EF_SPARC_HAL_R1)
 666
 667       if ((ibfd->flags & DYNAMIC) != 0)
 668         {
 669           /* We don't want dynamic objects memory ordering and
 670              architecture to have any role. That's what dynamic linker
 671              should do.  */
 672           new_flags &= ~(EF_SPARCV9_MM | EF_SPARC_ISA_EXTENSIONS);
 673           new_flags |= (old_flags
 674                         & (EF_SPARCV9_MM | EF_SPARC_ISA_EXTENSIONS));
 675         }
 676       else
 677         {
 678           /* Choose the highest architecture requirements.  */
 679           old_flags |= (new_flags & EF_SPARC_ISA_EXTENSIONS);
 680           new_flags |= (old_flags & EF_SPARC_ISA_EXTENSIONS);
 681           if ((old_flags & (EF_SPARC_SUN_US1 | EF_SPARC_SUN_US3))
 682               && (old_flags & EF_SPARC_HAL_R1))
 683             {
 684               error = TRUE;
 685               (*_bfd_error_handler)
 686                 (_("%B: linking UltraSPARC specific with HAL specific code"),
 687                  ibfd);
 688             }
 689           /* Choose the most restrictive memory ordering.  */
 690           old_mm = (old_flags & EF_SPARCV9_MM);
 691           new_mm = (new_flags & EF_SPARCV9_MM);
 692           old_flags &= ~EF_SPARCV9_MM;
 693           new_flags &= ~EF_SPARCV9_MM;
 694           if (new_mm < old_mm)
 695             old_mm = new_mm;
 696           old_flags |= old_mm;
 697           new_flags |= old_mm;
 698         }
 699
 700       /* Warn about any other mismatches */
 701       if (new_flags != old_flags)
 702         {
 703           error = TRUE;
 704           (*_bfd_error_handler)
 705             (_("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
 706              ibfd, (long) new_flags, (long) old_flags);
 707         }
 708
 709       elf_elfheader (obfd)->e_flags = old_flags;
 710
 711       if (error)
 712         {
 713           bfd_set_error (bfd_error_bad_value);
 714           return FALSE;
 715         }
 716     }
 717   return _bfd_sparc_elf_merge_private_bfd_data (ibfd, obfd);
 718 }
 719
 720 /* MARCO: Set the correct entry size for the .stab section.  */
 721
 722 static bfd_boolean
 723 elf64_sparc_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
 724                            Elf_Internal_Shdr *hdr ATTRIBUTE_UNUSED,
 725                            asection *sec)
 726 {
 727   const char *name;
 728
 729   name = bfd_get_section_name (abfd, sec);
 730
 731   if (strcmp (name, ".stab") == 0)
 732     {
 733       /* Even in the 64bit case the stab entries are only 12 bytes long.  */
 734       elf_section_data (sec)->this_hdr.sh_entsize = 12;
 735     }
 736
 737   return TRUE;
 738 }
 739 \f
 740 /* Print a STT_REGISTER symbol to file FILE.  */
 741
 742 static const char *
 743 elf64_sparc_print_symbol_all (bfd *abfd ATTRIBUTE_UNUSED, void * filep,
 744                               asymbol *symbol)
 745 {
 746   FILE *file = (FILE *) filep;
 747   int reg, type;
 748
 749   if (ELF_ST_TYPE (((elf_symbol_type *) symbol)->internal_elf_sym.st_info)
 750       != STT_REGISTER)
 751     return NULL;
 752
 753   reg = ((elf_symbol_type *) symbol)->internal_elf_sym.st_value;
 754   type = symbol->flags;
 755   fprintf (file, "REG_%c%c%11s%c%c    R", "GOLI" [reg / 8], '0' + (reg & 7), "",
 756                  ((type & BSF_LOCAL)
 757                   ? (type & BSF_GLOBAL) ? '!' : 'l'
 758                   : (type & BSF_GLOBAL) ? 'g' : ' '),
 759                  (type & BSF_WEAK) ? 'w' : ' ');
 760   if (symbol->name == NULL || symbol->name [0] == '\0')
 761     return "#scratch";
 762   else
 763     return symbol->name;
 764 }
 765 \f
 766 static enum elf_reloc_type_class
 767 elf64_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
 768                               const asection *rel_sec ATTRIBUTE_UNUSED,
 769                               const Elf_Internal_Rela *rela)
 770 {
 771   switch ((int) ELF64_R_TYPE (rela->r_info))
 772     {
 773     case R_SPARC_RELATIVE:
 774       return reloc_class_relative;
 775     case R_SPARC_JMP_SLOT:
 776       return reloc_class_plt;
 777     case R_SPARC_COPY:
 778       return reloc_class_copy;
 779     default:
 780       return reloc_class_normal;
 781     }
 782 }
 783
 784 /* Relocations in the 64 bit SPARC ELF ABI are more complex than in
 785    standard ELF, because R_SPARC_OLO10 has secondary addend in
 786    ELF64_R_TYPE_DATA field.  This structure is used to redirect the
 787    relocation handling routines.  */
 788
 789 const struct elf_size_info elf64_sparc_size_info =
 790 {
 791   sizeof (Elf64_External_Ehdr),
 792   sizeof (Elf64_External_Phdr),
 793   sizeof (Elf64_External_Shdr),
 794   sizeof (Elf64_External_Rel),
 795   sizeof (Elf64_External_Rela),
 796   sizeof (Elf64_External_Sym),
 797   sizeof (Elf64_External_Dyn),
 798   sizeof (Elf_External_Note),
 799   4,            /* hash-table entry size.  */
 800   /* Internal relocations per external relocations.
 801      For link purposes we use just 1 internal per
 802      1 external, for assembly and slurp symbol table
 803      we use 2.  */
 804   1,
 805   64,           /* arch_size.  */
 806   3,            /* log_file_align.  */
 807   ELFCLASS64,
 808   EV_CURRENT,
 809   bfd_elf64_write_out_phdrs,
 810   bfd_elf64_write_shdrs_and_ehdr,
 811   bfd_elf64_checksum_contents,
 812   elf64_sparc_write_relocs,
 813   bfd_elf64_swap_symbol_in,
 814   bfd_elf64_swap_symbol_out,
 815   elf64_sparc_slurp_reloc_table,
 816   bfd_elf64_slurp_symbol_table,
 817   bfd_elf64_swap_dyn_in,
 818   bfd_elf64_swap_dyn_out,
 819   bfd_elf64_swap_reloc_in,
 820   bfd_elf64_swap_reloc_out,
 821   bfd_elf64_swap_reloca_in,
 822   bfd_elf64_swap_reloca_out
 823 };
 824
 825 #define TARGET_BIG_SYM  sparc_elf64_vec
 826 #define TARGET_BIG_NAME "elf64-sparc"
 827 #define ELF_ARCH        bfd_arch_sparc
 828 #define ELF_MAXPAGESIZE 0x100000
 829 #define ELF_COMMONPAGESIZE 0x2000
 830
 831 /* This is the official ABI value.  */
 832 #define ELF_MACHINE_CODE EM_SPARCV9
 833
 834 /* This is the value that we used before the ABI was released.  */
 835 #define ELF_MACHINE_ALT1 EM_OLD_SPARCV9
 836
 837 #define elf_backend_reloc_type_class \
 838   elf64_sparc_reloc_type_class
 839 #define bfd_elf64_get_reloc_upper_bound \
 840   elf64_sparc_get_reloc_upper_bound
 841 #define bfd_elf64_get_dynamic_reloc_upper_bound \
 842   elf64_sparc_get_dynamic_reloc_upper_bound
 843 #define bfd_elf64_canonicalize_reloc \
 844   elf64_sparc_canonicalize_reloc
 845 #define bfd_elf64_canonicalize_dynamic_reloc \
 846   elf64_sparc_canonicalize_dynamic_reloc
 847 #define elf_backend_add_symbol_hook \
 848   elf64_sparc_add_symbol_hook
 849 #define elf_backend_get_symbol_type \
 850   elf64_sparc_get_symbol_type
 851 #define elf_backend_symbol_processing \
 852   elf64_sparc_symbol_processing
 853 #define elf_backend_print_symbol_all \
 854   elf64_sparc_print_symbol_all
 855 #define elf_backend_output_arch_syms \
 856   elf64_sparc_output_arch_syms
 857 #define bfd_elf64_bfd_merge_private_bfd_data \
 858   elf64_sparc_merge_private_bfd_data
 859 #define elf_backend_fake_sections \
 860   elf64_sparc_fake_sections
 861 #define elf_backend_size_info \
 862   elf64_sparc_size_info
 863
 864 #define elf_backend_plt_sym_val \
 865   _bfd_sparc_elf_plt_sym_val
 866 #define bfd_elf64_bfd_link_hash_table_create \
 867   _bfd_sparc_elf_link_hash_table_create
 868 #define elf_info_to_howto \
 869   _bfd_sparc_elf_info_to_howto
 870 #define elf_backend_copy_indirect_symbol \
 871   _bfd_sparc_elf_copy_indirect_symbol
 872 #define bfd_elf64_bfd_reloc_type_lookup \
 873   _bfd_sparc_elf_reloc_type_lookup
 874 #define bfd_elf64_bfd_reloc_name_lookup \
 875   _bfd_sparc_elf_reloc_name_lookup
 876 #define bfd_elf64_bfd_relax_section \
 877   _bfd_sparc_elf_relax_section
 878 #define bfd_elf64_new_section_hook \
 879   _bfd_sparc_elf_new_section_hook
 880
 881 #define elf_backend_create_dynamic_sections \
 882   _bfd_sparc_elf_create_dynamic_sections
 883 #define elf_backend_relocs_compatible \
 884   _bfd_elf_relocs_compatible
 885 #define elf_backend_check_relocs \
 886   _bfd_sparc_elf_check_relocs
 887 #define elf_backend_adjust_dynamic_symbol \
 888   _bfd_sparc_elf_adjust_dynamic_symbol
 889 #define elf_backend_omit_section_dynsym \
 890   _bfd_sparc_elf_omit_section_dynsym
 891 #define elf_backend_size_dynamic_sections \
 892   _bfd_sparc_elf_size_dynamic_sections
 893 #define elf_backend_relocate_section \
 894   _bfd_sparc_elf_relocate_section
 895 #define elf_backend_finish_dynamic_symbol \
 896   _bfd_sparc_elf_finish_dynamic_symbol
 897 #define elf_backend_finish_dynamic_sections \
 898   _bfd_sparc_elf_finish_dynamic_sections
 899
 900 #define bfd_elf64_mkobject \
 901   _bfd_sparc_elf_mkobject
 902 #define elf_backend_object_p \
 903   _bfd_sparc_elf_object_p
 904 #define elf_backend_gc_mark_hook \
 905   _bfd_sparc_elf_gc_mark_hook
 906 #define elf_backend_gc_sweep_hook \
 907   _bfd_sparc_elf_gc_sweep_hook
 908 #define elf_backend_init_index_section \
 909   _bfd_elf_init_1_index_section
 910
 911 #define elf_backend_can_gc_sections 1
 912 #define elf_backend_can_refcount 1
 913 #define elf_backend_want_got_plt 0
 914 #define elf_backend_plt_readonly 0
 915 #define elf_backend_want_plt_sym 1
 916 #define elf_backend_got_header_size 8
 917 #define elf_backend_rela_normal 1
 918
 919 /* Section 5.2.4 of the ABI specifies a 256-byte boundary for the table.  */
 920 #define elf_backend_plt_alignment 8
 921
 922 #include "elf64-target.h"
 923
 924 /* FreeBSD support */
 925 #undef  TARGET_BIG_SYM
 926 #define TARGET_BIG_SYM sparc_elf64_fbsd_vec
 927 #undef  TARGET_BIG_NAME
 928 #define TARGET_BIG_NAME "elf64-sparc-freebsd"
 929 #undef  ELF_OSABI
 930 #define ELF_OSABI ELFOSABI_FREEBSD
 931
 932 #undef  elf64_bed
 933 #define elf64_bed                               elf64_sparc_fbsd_bed
 934
 935 #include "elf64-target.h"
 936
 937 /* Solaris 2.  */
 938
 939 #undef  TARGET_BIG_SYM
 940 #define TARGET_BIG_SYM                          sparc_elf64_sol2_vec
 941 #undef  TARGET_BIG_NAME
 942 #define TARGET_BIG_NAME                         "elf64-sparc-sol2"
 943
 944 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
 945    objects won't be recognized.  */
 946 #undef  ELF_OSABI
 947
 948 #undef elf64_bed
 949 #define elf64_bed                               elf64_sparc_sol2_bed
 950
 951 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
 952    boundary.  */
 953 #undef elf_backend_static_tls_alignment
 954 #define elf_backend_static_tls_alignment        16
 955
 956 #include "elf64-target.h"