bfd/elf64-sparc.c

   1 /* SPARC-specific support for 64-bit ELF
   2    Copyright (C) 1993-2015 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           /* PR 17512: file: 996185f8.  */
 102           || ELF64_R_SYM (rela.r_info) > bfd_get_symcount (abfd))
 103         relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 104       else
 105         {
 106           asymbol **ps, *s;
 107
 108           ps = symbols + ELF64_R_SYM (rela.r_info) - 1;
 109           s = *ps;
 110
 111           /* Canonicalize ELF section symbols.  FIXME: Why?  */
 112           if ((s->flags & BSF_SECTION_SYM) == 0)
 113             relent->sym_ptr_ptr = ps;
 114           else
 115             relent->sym_ptr_ptr = s->section->symbol_ptr_ptr;
 116         }
 117
 118       relent->addend = rela.r_addend;
 119
 120       r_type = ELF64_R_TYPE_ID (rela.r_info);
 121       if (r_type == R_SPARC_OLO10)
 122         {
 123           relent->howto = _bfd_sparc_elf_info_to_howto_ptr (R_SPARC_LO10);
 124           relent[1].address = relent->address;
 125           relent++;
 126           relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 127           relent->addend = ELF64_R_TYPE_DATA (rela.r_info);
 128           relent->howto = _bfd_sparc_elf_info_to_howto_ptr (R_SPARC_13);
 129         }
 130       else
 131         relent->howto = _bfd_sparc_elf_info_to_howto_ptr (r_type);
 132     }
 133
 134   canon_reloc_count (asect) += relent - relents;
 135
 136   if (allocated != NULL)
 137     free (allocated);
 138
 139   return TRUE;
 140
 141  error_return:
 142   if (allocated != NULL)
 143     free (allocated);
 144   return FALSE;
 145 }
 146
 147 /* Read in and swap the external relocs.  */
 148
 149 static bfd_boolean
 150 elf64_sparc_slurp_reloc_table (bfd *abfd, asection *asect,
 151                                asymbol **symbols, bfd_boolean dynamic)
 152 {
 153   struct bfd_elf_section_data * const d = elf_section_data (asect);
 154   Elf_Internal_Shdr *rel_hdr;
 155   Elf_Internal_Shdr *rel_hdr2;
 156   bfd_size_type amt;
 157
 158   if (asect->relocation != NULL)
 159     return TRUE;
 160
 161   if (! dynamic)
 162     {
 163       if ((asect->flags & SEC_RELOC) == 0
 164           || asect->reloc_count == 0)
 165         return TRUE;
 166
 167       rel_hdr = d->rel.hdr;
 168       rel_hdr2 = d->rela.hdr;
 169
 170       BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset)
 171                   || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset));
 172     }
 173   else
 174     {
 175       /* Note that ASECT->RELOC_COUNT tends not to be accurate in this
 176          case because relocations against this section may use the
 177          dynamic symbol table, and in that case bfd_section_from_shdr
 178          in elf.c does not update the RELOC_COUNT.  */
 179       if (asect->size == 0)
 180         return TRUE;
 181
 182       rel_hdr = &d->this_hdr;
 183       asect->reloc_count = NUM_SHDR_ENTRIES (rel_hdr);
 184       rel_hdr2 = NULL;
 185     }
 186
 187   amt = asect->reloc_count;
 188   amt *= 2 * sizeof (arelent);
 189   asect->relocation = (arelent *) bfd_alloc (abfd, amt);
 190   if (asect->relocation == NULL)
 191     return FALSE;
 192
 193   /* The elf64_sparc_slurp_one_reloc_table routine increments
 194      canon_reloc_count.  */
 195   canon_reloc_count (asect) = 0;
 196
 197   if (rel_hdr
 198       && !elf64_sparc_slurp_one_reloc_table (abfd, asect, rel_hdr, symbols,
 199                                              dynamic))
 200     return FALSE;
 201
 202   if (rel_hdr2
 203       && !elf64_sparc_slurp_one_reloc_table (abfd, asect, rel_hdr2, symbols,
 204                                              dynamic))
 205     return FALSE;
 206
 207   return TRUE;
 208 }
 209
 210 /* Canonicalize the relocs.  */
 211
 212 static long
 213 elf64_sparc_canonicalize_reloc (bfd *abfd, sec_ptr section,
 214                                 arelent **relptr, asymbol **symbols)
 215 {
 216   arelent *tblptr;
 217   unsigned int i;
 218   const struct elf_backend_data *bed = get_elf_backend_data (abfd);
 219
 220   if (! bed->s->slurp_reloc_table (abfd, section, symbols, FALSE))
 221     return -1;
 222
 223   tblptr = section->relocation;
 224   for (i = 0; i < canon_reloc_count (section); i++)
 225     *relptr++ = tblptr++;
 226
 227   *relptr = NULL;
 228
 229   return canon_reloc_count (section);
 230 }
 231
 232
 233 /* Canonicalize the dynamic relocation entries.  Note that we return
 234    the dynamic relocations as a single block, although they are
 235    actually associated with particular sections; the interface, which
 236    was designed for SunOS style shared libraries, expects that there
 237    is only one set of dynamic relocs.  Any section that was actually
 238    installed in the BFD, and has type SHT_REL or SHT_RELA, and uses
 239    the dynamic symbol table, is considered to be a dynamic reloc
 240    section.  */
 241
 242 static long
 243 elf64_sparc_canonicalize_dynamic_reloc (bfd *abfd, arelent **storage,
 244                                         asymbol **syms)
 245 {
 246   asection *s;
 247   long ret;
 248
 249   if (elf_dynsymtab (abfd) == 0)
 250     {
 251       bfd_set_error (bfd_error_invalid_operation);
 252       return -1;
 253     }
 254
 255   ret = 0;
 256   for (s = abfd->sections; s != NULL; s = s->next)
 257     {
 258       if (elf_section_data (s)->this_hdr.sh_link == elf_dynsymtab (abfd)
 259           && (elf_section_data (s)->this_hdr.sh_type == SHT_RELA))
 260         {
 261           arelent *p;
 262           long count, i;
 263
 264           if (! elf64_sparc_slurp_reloc_table (abfd, s, syms, TRUE))
 265             return -1;
 266           count = canon_reloc_count (s);
 267           p = s->relocation;
 268           for (i = 0; i < count; i++)
 269             *storage++ = p++;
 270           ret += count;
 271         }
 272     }
 273
 274   *storage = NULL;
 275
 276   return ret;
 277 }
 278
 279 /* Write out the relocs.  */
 280
 281 static void
 282 elf64_sparc_write_relocs (bfd *abfd, asection *sec, void * data)
 283 {
 284   bfd_boolean *failedp = (bfd_boolean *) data;
 285   Elf_Internal_Shdr *rela_hdr;
 286   bfd_vma addr_offset;
 287   Elf64_External_Rela *outbound_relocas, *src_rela;
 288   unsigned int idx, count;
 289   asymbol *last_sym = 0;
 290   int last_sym_idx = 0;
 291
 292   /* If we have already failed, don't do anything.  */
 293   if (*failedp)
 294     return;
 295
 296   if ((sec->flags & SEC_RELOC) == 0)
 297     return;
 298
 299   /* The linker backend writes the relocs out itself, and sets the
 300      reloc_count field to zero to inhibit writing them here.  Also,
 301      sometimes the SEC_RELOC flag gets set even when there aren't any
 302      relocs.  */
 303   if (sec->reloc_count == 0)
 304     return;
 305
 306   /* We can combine two relocs that refer to the same address
 307      into R_SPARC_OLO10 if first one is R_SPARC_LO10 and the
 308      latter is R_SPARC_13 with no associated symbol.  */
 309   count = 0;
 310   for (idx = 0; idx < sec->reloc_count; idx++)
 311     {
 312       bfd_vma addr;
 313
 314       ++count;
 315
 316       addr = sec->orelocation[idx]->address;
 317       if (sec->orelocation[idx]->howto->type == R_SPARC_LO10
 318           && idx < sec->reloc_count - 1)
 319         {
 320           arelent *r = sec->orelocation[idx + 1];
 321
 322           if (r->howto->type == R_SPARC_13
 323               && r->address == addr
 324               && bfd_is_abs_section ((*r->sym_ptr_ptr)->section)
 325               && (*r->sym_ptr_ptr)->value == 0)
 326             ++idx;
 327         }
 328     }
 329
 330   rela_hdr = elf_section_data (sec)->rela.hdr;
 331
 332   rela_hdr->sh_size = rela_hdr->sh_entsize * count;
 333   rela_hdr->contents = bfd_alloc (abfd, rela_hdr->sh_size);
 334   if (rela_hdr->contents == NULL)
 335     {
 336       *failedp = TRUE;
 337       return;
 338     }
 339
 340   /* Figure out whether the relocations are RELA or REL relocations.  */
 341   if (rela_hdr->sh_type != SHT_RELA)
 342     abort ();
 343
 344   /* The address of an ELF reloc is section relative for an object
 345      file, and absolute for an executable file or shared library.
 346      The address of a BFD reloc is always section relative.  */
 347   addr_offset = 0;
 348   if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
 349     addr_offset = sec->vma;
 350
 351   /* orelocation has the data, reloc_count has the count...  */
 352   outbound_relocas = (Elf64_External_Rela *) rela_hdr->contents;
 353   src_rela = outbound_relocas;
 354
 355   for (idx = 0; idx < sec->reloc_count; idx++)
 356     {
 357       Elf_Internal_Rela dst_rela;
 358       arelent *ptr;
 359       asymbol *sym;
 360       int n;
 361
 362       ptr = sec->orelocation[idx];
 363       sym = *ptr->sym_ptr_ptr;
 364       if (sym == last_sym)
 365         n = last_sym_idx;
 366       else if (bfd_is_abs_section (sym->section) && sym->value == 0)
 367         n = STN_UNDEF;
 368       else
 369         {
 370           last_sym = sym;
 371           n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
 372           if (n < 0)
 373             {
 374               *failedp = TRUE;
 375               return;
 376             }
 377           last_sym_idx = n;
 378         }
 379
 380       if ((*ptr->sym_ptr_ptr)->the_bfd != NULL
 381           && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
 382           && ! _bfd_elf_validate_reloc (abfd, ptr))
 383         {
 384           *failedp = TRUE;
 385           return;
 386         }
 387
 388       if (ptr->howto->type == R_SPARC_LO10
 389           && idx < sec->reloc_count - 1)
 390         {
 391           arelent *r = sec->orelocation[idx + 1];
 392
 393           if (r->howto->type == R_SPARC_13
 394               && r->address == ptr->address
 395               && bfd_is_abs_section ((*r->sym_ptr_ptr)->section)
 396               && (*r->sym_ptr_ptr)->value == 0)
 397             {
 398               idx++;
 399               dst_rela.r_info
 400                 = ELF64_R_INFO (n, ELF64_R_TYPE_INFO (r->addend,
 401                                                       R_SPARC_OLO10));
 402             }
 403           else
 404             dst_rela.r_info = ELF64_R_INFO (n, R_SPARC_LO10);
 405         }
 406       else
 407         dst_rela.r_info = ELF64_R_INFO (n, ptr->howto->type);
 408
 409       dst_rela.r_offset = ptr->address + addr_offset;
 410       dst_rela.r_addend = ptr->addend;
 411
 412       bfd_elf64_swap_reloca_out (abfd, &dst_rela, (bfd_byte *) src_rela);
 413       ++src_rela;
 414     }
 415 }
 416 \f
 417 /* Hook called by the linker routine which adds symbols from an object
 418    file.  We use it for STT_REGISTER symbols.  */
 419
 420 static bfd_boolean
 421 elf64_sparc_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
 422                              Elf_Internal_Sym *sym, const char **namep,
 423                              flagword *flagsp ATTRIBUTE_UNUSED,
 424                              asection **secp ATTRIBUTE_UNUSED,
 425                              bfd_vma *valp ATTRIBUTE_UNUSED)
 426 {
 427   static const char *const stt_types[] = { "NOTYPE", "OBJECT", "FUNCTION" };
 428
 429   if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
 430        || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
 431       && (abfd->flags & DYNAMIC) == 0
 432       && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
 433     elf_tdata (info->output_bfd)->has_gnu_symbols = elf_gnu_symbol_any;
 434
 435   if (ELF_ST_TYPE (sym->st_info) == STT_REGISTER)
 436     {
 437       int reg;
 438       struct _bfd_sparc_elf_app_reg *p;
 439
 440       reg = (int)sym->st_value;
 441       switch (reg & ~1)
 442         {
 443         case 2: reg -= 2; break;
 444         case 6: reg -= 4; break;
 445         default:
 446           (*_bfd_error_handler)
 447             (_("%B: Only registers %%g[2367] can be declared using STT_REGISTER"),
 448              abfd);
 449           return FALSE;
 450         }
 451
 452       if (info->output_bfd->xvec != abfd->xvec
 453           || (abfd->flags & DYNAMIC) != 0)
 454         {
 455           /* STT_REGISTER only works when linking an elf64_sparc object.
 456              If STT_REGISTER comes from a dynamic object, don't put it into
 457              the output bfd.  The dynamic linker will recheck it.  */
 458           *namep = NULL;
 459           return TRUE;
 460         }
 461
 462       p = _bfd_sparc_elf_hash_table(info)->app_regs + reg;
 463
 464       if (p->name != NULL && strcmp (p->name, *namep))
 465         {
 466           (*_bfd_error_handler)
 467             (_("Register %%g%d used incompatibly: %s in %B, previously %s in %B"),
 468              abfd, p->abfd, (int) sym->st_value,
 469              **namep ? *namep : "#scratch",
 470              *p->name ? p->name : "#scratch");
 471           return FALSE;
 472         }
 473
 474       if (p->name == NULL)
 475         {
 476           if (**namep)
 477             {
 478               struct elf_link_hash_entry *h;
 479
 480               h = (struct elf_link_hash_entry *)
 481                 bfd_link_hash_lookup (info->hash, *namep, FALSE, FALSE, FALSE);
 482
 483               if (h != NULL)
 484                 {
 485                   unsigned char type = h->type;
 486
 487                   if (type > STT_FUNC)
 488                     type = 0;
 489                   (*_bfd_error_handler)
 490                     (_("Symbol `%s' has differing types: REGISTER in %B, previously %s in %B"),
 491                      abfd, p->abfd, *namep, stt_types[type]);
 492                   return FALSE;
 493                 }
 494
 495               p->name = bfd_hash_allocate (&info->hash->table,
 496                                            strlen (*namep) + 1);
 497               if (!p->name)
 498                 return FALSE;
 499
 500               strcpy (p->name, *namep);
 501             }
 502           else
 503             p->name = "";
 504           p->bind = ELF_ST_BIND (sym->st_info);
 505           p->abfd = abfd;
 506           p->shndx = sym->st_shndx;
 507         }
 508       else
 509         {
 510           if (p->bind == STB_WEAK
 511               && ELF_ST_BIND (sym->st_info) == STB_GLOBAL)
 512             {
 513               p->bind = STB_GLOBAL;
 514               p->abfd = abfd;
 515             }
 516         }
 517       *namep = NULL;
 518       return TRUE;
 519     }
 520   else if (*namep && **namep
 521            && info->output_bfd->xvec == abfd->xvec)
 522     {
 523       int i;
 524       struct _bfd_sparc_elf_app_reg *p;
 525
 526       p = _bfd_sparc_elf_hash_table(info)->app_regs;
 527       for (i = 0; i < 4; i++, p++)
 528         if (p->name != NULL && ! strcmp (p->name, *namep))
 529           {
 530             unsigned char type = ELF_ST_TYPE (sym->st_info);
 531
 532             if (type > STT_FUNC)
 533               type = 0;
 534             (*_bfd_error_handler)
 535               (_("Symbol `%s' has differing types: %s in %B, previously REGISTER in %B"),
 536                abfd, p->abfd, *namep, stt_types[type]);
 537             return FALSE;
 538           }
 539     }
 540   return TRUE;
 541 }
 542
 543 /* This function takes care of emitting STT_REGISTER symbols
 544    which we cannot easily keep in the symbol hash table.  */
 545
 546 static bfd_boolean
 547 elf64_sparc_output_arch_syms (bfd *output_bfd ATTRIBUTE_UNUSED,
 548                               struct bfd_link_info *info,
 549                               void * flaginfo,
 550                               int (*func) (void *, const char *,
 551                                            Elf_Internal_Sym *,
 552                                            asection *,
 553                                            struct elf_link_hash_entry *))
 554 {
 555   int reg;
 556   struct _bfd_sparc_elf_app_reg *app_regs =
 557     _bfd_sparc_elf_hash_table(info)->app_regs;
 558   Elf_Internal_Sym sym;
 559
 560   /* We arranged in size_dynamic_sections to put the STT_REGISTER entries
 561      at the end of the dynlocal list, so they came at the end of the local
 562      symbols in the symtab.  Except that they aren't STB_LOCAL, so we need
 563      to back up symtab->sh_info.  */
 564   if (elf_hash_table (info)->dynlocal)
 565     {
 566       bfd * dynobj = elf_hash_table (info)->dynobj;
 567       asection *dynsymsec = bfd_get_linker_section (dynobj, ".dynsym");
 568       struct elf_link_local_dynamic_entry *e;
 569
 570       for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
 571         if (e->input_indx == -1)
 572           break;
 573       if (e)
 574         {
 575           elf_section_data (dynsymsec->output_section)->this_hdr.sh_info
 576             = e->dynindx;
 577         }
 578     }
 579
 580   if (info->strip == strip_all)
 581     return TRUE;
 582
 583   for (reg = 0; reg < 4; reg++)
 584     if (app_regs [reg].name != NULL)
 585       {
 586         if (info->strip == strip_some
 587             && bfd_hash_lookup (info->keep_hash,
 588                                 app_regs [reg].name,
 589                                 FALSE, FALSE) == NULL)
 590           continue;
 591
 592         sym.st_value = reg < 2 ? reg + 2 : reg + 4;
 593         sym.st_size = 0;
 594         sym.st_other = 0;
 595         sym.st_info = ELF_ST_INFO (app_regs [reg].bind, STT_REGISTER);
 596         sym.st_shndx = app_regs [reg].shndx;
 597         sym.st_target_internal = 0;
 598         if ((*func) (flaginfo, app_regs [reg].name, &sym,
 599                      sym.st_shndx == SHN_ABS
 600                      ? bfd_abs_section_ptr : bfd_und_section_ptr,
 601                      NULL) != 1)
 602           return FALSE;
 603       }
 604
 605   return TRUE;
 606 }
 607
 608 static int
 609 elf64_sparc_get_symbol_type (Elf_Internal_Sym *elf_sym, int type)
 610 {
 611   if (ELF_ST_TYPE (elf_sym->st_info) == STT_REGISTER)
 612     return STT_REGISTER;
 613   else
 614     return type;
 615 }
 616
 617 /* A STB_GLOBAL,STT_REGISTER symbol should be BSF_GLOBAL
 618    even in SHN_UNDEF section.  */
 619
 620 static void
 621 elf64_sparc_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym)
 622 {
 623   elf_symbol_type *elfsym;
 624
 625   elfsym = (elf_symbol_type *) asym;
 626   if (elfsym->internal_elf_sym.st_info
 627       == ELF_ST_INFO (STB_GLOBAL, STT_REGISTER))
 628     {
 629       asym->flags |= BSF_GLOBAL;
 630     }
 631 }
 632
 633 \f
 634 /* Functions for dealing with the e_flags field.  */
 635
 636 /* Merge backend specific data from an object file to the output
 637    object file when linking.  */
 638
 639 static bfd_boolean
 640 elf64_sparc_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
 641 {
 642   bfd_boolean error;
 643   flagword new_flags, old_flags;
 644   int new_mm, old_mm;
 645
 646   if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
 647       || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
 648     return TRUE;
 649
 650   new_flags = elf_elfheader (ibfd)->e_flags;
 651   old_flags = elf_elfheader (obfd)->e_flags;
 652
 653   if (!elf_flags_init (obfd))   /* First call, no flags set */
 654     {
 655       elf_flags_init (obfd) = TRUE;
 656       elf_elfheader (obfd)->e_flags = new_flags;
 657     }
 658
 659   else if (new_flags == old_flags)      /* Compatible flags are ok */
 660     ;
 661
 662   else                                  /* Incompatible flags */
 663     {
 664       error = FALSE;
 665
 666 #define EF_SPARC_ISA_EXTENSIONS \
 667   (EF_SPARC_SUN_US1 | EF_SPARC_SUN_US3 | EF_SPARC_HAL_R1)
 668
 669       if ((ibfd->flags & DYNAMIC) != 0)
 670         {
 671           /* We don't want dynamic objects memory ordering and
 672              architecture to have any role. That's what dynamic linker
 673              should do.  */
 674           new_flags &= ~(EF_SPARCV9_MM | EF_SPARC_ISA_EXTENSIONS);
 675           new_flags |= (old_flags
 676                         & (EF_SPARCV9_MM | EF_SPARC_ISA_EXTENSIONS));
 677         }
 678       else
 679         {
 680           /* Choose the highest architecture requirements.  */
 681           old_flags |= (new_flags & EF_SPARC_ISA_EXTENSIONS);
 682           new_flags |= (old_flags & EF_SPARC_ISA_EXTENSIONS);
 683           if ((old_flags & (EF_SPARC_SUN_US1 | EF_SPARC_SUN_US3))
 684               && (old_flags & EF_SPARC_HAL_R1))
 685             {
 686               error = TRUE;
 687               (*_bfd_error_handler)
 688                 (_("%B: linking UltraSPARC specific with HAL specific code"),
 689                  ibfd);
 690             }
 691           /* Choose the most restrictive memory ordering.  */
 692           old_mm = (old_flags & EF_SPARCV9_MM);
 693           new_mm = (new_flags & EF_SPARCV9_MM);
 694           old_flags &= ~EF_SPARCV9_MM;
 695           new_flags &= ~EF_SPARCV9_MM;
 696           if (new_mm < old_mm)
 697             old_mm = new_mm;
 698           old_flags |= old_mm;
 699           new_flags |= old_mm;
 700         }
 701
 702       /* Warn about any other mismatches */
 703       if (new_flags != old_flags)
 704         {
 705           error = TRUE;
 706           (*_bfd_error_handler)
 707             (_("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
 708              ibfd, (long) new_flags, (long) old_flags);
 709         }
 710
 711       elf_elfheader (obfd)->e_flags = old_flags;
 712
 713       if (error)
 714         {
 715           bfd_set_error (bfd_error_bad_value);
 716           return FALSE;
 717         }
 718     }
 719   return _bfd_sparc_elf_merge_private_bfd_data (ibfd, obfd);
 720 }
 721
 722 /* MARCO: Set the correct entry size for the .stab section.  */
 723
 724 static bfd_boolean
 725 elf64_sparc_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
 726                            Elf_Internal_Shdr *hdr ATTRIBUTE_UNUSED,
 727                            asection *sec)
 728 {
 729   const char *name;
 730
 731   name = bfd_get_section_name (abfd, sec);
 732
 733   if (strcmp (name, ".stab") == 0)
 734     {
 735       /* Even in the 64bit case the stab entries are only 12 bytes long.  */
 736       elf_section_data (sec)->this_hdr.sh_entsize = 12;
 737     }
 738
 739   return TRUE;
 740 }
 741 \f
 742 /* Print a STT_REGISTER symbol to file FILE.  */
 743
 744 static const char *
 745 elf64_sparc_print_symbol_all (bfd *abfd ATTRIBUTE_UNUSED, void * filep,
 746                               asymbol *symbol)
 747 {
 748   FILE *file = (FILE *) filep;
 749   int reg, type;
 750
 751   if (ELF_ST_TYPE (((elf_symbol_type *) symbol)->internal_elf_sym.st_info)
 752       != STT_REGISTER)
 753     return NULL;
 754
 755   reg = ((elf_symbol_type *) symbol)->internal_elf_sym.st_value;
 756   type = symbol->flags;
 757   fprintf (file, "REG_%c%c%11s%c%c    R", "GOLI" [reg / 8], '0' + (reg & 7), "",
 758                  ((type & BSF_LOCAL)
 759                   ? (type & BSF_GLOBAL) ? '!' : 'l'
 760                   : (type & BSF_GLOBAL) ? 'g' : ' '),
 761                  (type & BSF_WEAK) ? 'w' : ' ');
 762   if (symbol->name == NULL || symbol->name [0] == '\0')
 763     return "#scratch";
 764   else
 765     return symbol->name;
 766 }
 767 \f
 768 static enum elf_reloc_type_class
 769 elf64_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
 770                               const asection *rel_sec ATTRIBUTE_UNUSED,
 771                               const Elf_Internal_Rela *rela)
 772 {
 773   switch ((int) ELF64_R_TYPE (rela->r_info))
 774     {
 775     case R_SPARC_RELATIVE:
 776       return reloc_class_relative;
 777     case R_SPARC_JMP_SLOT:
 778       return reloc_class_plt;
 779     case R_SPARC_COPY:
 780       return reloc_class_copy;
 781     default:
 782       return reloc_class_normal;
 783     }
 784 }
 785
 786 /* Relocations in the 64 bit SPARC ELF ABI are more complex than in
 787    standard ELF, because R_SPARC_OLO10 has secondary addend in
 788    ELF64_R_TYPE_DATA field.  This structure is used to redirect the
 789    relocation handling routines.  */
 790
 791 const struct elf_size_info elf64_sparc_size_info =
 792 {
 793   sizeof (Elf64_External_Ehdr),
 794   sizeof (Elf64_External_Phdr),
 795   sizeof (Elf64_External_Shdr),
 796   sizeof (Elf64_External_Rel),
 797   sizeof (Elf64_External_Rela),
 798   sizeof (Elf64_External_Sym),
 799   sizeof (Elf64_External_Dyn),
 800   sizeof (Elf_External_Note),
 801   4,            /* hash-table entry size.  */
 802   /* Internal relocations per external relocations.
 803      For link purposes we use just 1 internal per
 804      1 external, for assembly and slurp symbol table
 805      we use 2.  */
 806   1,
 807   64,           /* arch_size.  */
 808   3,            /* log_file_align.  */
 809   ELFCLASS64,
 810   EV_CURRENT,
 811   bfd_elf64_write_out_phdrs,
 812   bfd_elf64_write_shdrs_and_ehdr,
 813   bfd_elf64_checksum_contents,
 814   elf64_sparc_write_relocs,
 815   bfd_elf64_swap_symbol_in,
 816   bfd_elf64_swap_symbol_out,
 817   elf64_sparc_slurp_reloc_table,
 818   bfd_elf64_slurp_symbol_table,
 819   bfd_elf64_swap_dyn_in,
 820   bfd_elf64_swap_dyn_out,
 821   bfd_elf64_swap_reloc_in,
 822   bfd_elf64_swap_reloc_out,
 823   bfd_elf64_swap_reloca_in,
 824   bfd_elf64_swap_reloca_out
 825 };
 826
 827 #define TARGET_BIG_SYM  sparc_elf64_vec
 828 #define TARGET_BIG_NAME "elf64-sparc"
 829 #define ELF_ARCH        bfd_arch_sparc
 830 #define ELF_MAXPAGESIZE 0x100000
 831 #define ELF_COMMONPAGESIZE 0x2000
 832
 833 /* This is the official ABI value.  */
 834 #define ELF_MACHINE_CODE EM_SPARCV9
 835
 836 /* This is the value that we used before the ABI was released.  */
 837 #define ELF_MACHINE_ALT1 EM_OLD_SPARCV9
 838
 839 #define elf_backend_reloc_type_class \
 840   elf64_sparc_reloc_type_class
 841 #define bfd_elf64_get_reloc_upper_bound \
 842   elf64_sparc_get_reloc_upper_bound
 843 #define bfd_elf64_get_dynamic_reloc_upper_bound \
 844   elf64_sparc_get_dynamic_reloc_upper_bound
 845 #define bfd_elf64_canonicalize_reloc \
 846   elf64_sparc_canonicalize_reloc
 847 #define bfd_elf64_canonicalize_dynamic_reloc \
 848   elf64_sparc_canonicalize_dynamic_reloc
 849 #define elf_backend_add_symbol_hook \
 850   elf64_sparc_add_symbol_hook
 851 #define elf_backend_get_symbol_type \
 852   elf64_sparc_get_symbol_type
 853 #define elf_backend_symbol_processing \
 854   elf64_sparc_symbol_processing
 855 #define elf_backend_print_symbol_all \
 856   elf64_sparc_print_symbol_all
 857 #define elf_backend_output_arch_syms \
 858   elf64_sparc_output_arch_syms
 859 #define bfd_elf64_bfd_merge_private_bfd_data \
 860   elf64_sparc_merge_private_bfd_data
 861 #define elf_backend_fake_sections \
 862   elf64_sparc_fake_sections
 863 #define elf_backend_size_info \
 864   elf64_sparc_size_info
 865
 866 #define elf_backend_plt_sym_val \
 867   _bfd_sparc_elf_plt_sym_val
 868 #define bfd_elf64_bfd_link_hash_table_create \
 869   _bfd_sparc_elf_link_hash_table_create
 870 #define elf_info_to_howto \
 871   _bfd_sparc_elf_info_to_howto
 872 #define elf_backend_copy_indirect_symbol \
 873   _bfd_sparc_elf_copy_indirect_symbol
 874 #define bfd_elf64_bfd_reloc_type_lookup \
 875   _bfd_sparc_elf_reloc_type_lookup
 876 #define bfd_elf64_bfd_reloc_name_lookup \
 877   _bfd_sparc_elf_reloc_name_lookup
 878 #define bfd_elf64_bfd_relax_section \
 879   _bfd_sparc_elf_relax_section
 880 #define bfd_elf64_new_section_hook \
 881   _bfd_sparc_elf_new_section_hook
 882
 883 #define elf_backend_create_dynamic_sections \
 884   _bfd_sparc_elf_create_dynamic_sections
 885 #define elf_backend_relocs_compatible \
 886   _bfd_elf_relocs_compatible
 887 #define elf_backend_check_relocs \
 888   _bfd_sparc_elf_check_relocs
 889 #define elf_backend_adjust_dynamic_symbol \
 890   _bfd_sparc_elf_adjust_dynamic_symbol
 891 #define elf_backend_omit_section_dynsym \
 892   _bfd_sparc_elf_omit_section_dynsym
 893 #define elf_backend_size_dynamic_sections \
 894   _bfd_sparc_elf_size_dynamic_sections
 895 #define elf_backend_relocate_section \
 896   _bfd_sparc_elf_relocate_section
 897 #define elf_backend_finish_dynamic_symbol \
 898   _bfd_sparc_elf_finish_dynamic_symbol
 899 #define elf_backend_finish_dynamic_sections \
 900   _bfd_sparc_elf_finish_dynamic_sections
 901
 902 #define bfd_elf64_mkobject \
 903   _bfd_sparc_elf_mkobject
 904 #define elf_backend_object_p \
 905   _bfd_sparc_elf_object_p
 906 #define elf_backend_gc_mark_hook \
 907   _bfd_sparc_elf_gc_mark_hook
 908 #define elf_backend_gc_sweep_hook \
 909   _bfd_sparc_elf_gc_sweep_hook
 910 #define elf_backend_init_index_section \
 911   _bfd_elf_init_1_index_section
 912
 913 #define elf_backend_can_gc_sections 1
 914 #define elf_backend_can_refcount 1
 915 #define elf_backend_want_got_plt 0
 916 #define elf_backend_plt_readonly 0
 917 #define elf_backend_want_plt_sym 1
 918 #define elf_backend_got_header_size 8
 919 #define elf_backend_rela_normal 1
 920
 921 /* Section 5.2.4 of the ABI specifies a 256-byte boundary for the table.  */
 922 #define elf_backend_plt_alignment 8
 923
 924 #include "elf64-target.h"
 925
 926 /* FreeBSD support */
 927 #undef  TARGET_BIG_SYM
 928 #define TARGET_BIG_SYM sparc_elf64_fbsd_vec
 929 #undef  TARGET_BIG_NAME
 930 #define TARGET_BIG_NAME "elf64-sparc-freebsd"
 931 #undef  ELF_OSABI
 932 #define ELF_OSABI ELFOSABI_FREEBSD
 933
 934 #undef  elf64_bed
 935 #define elf64_bed                               elf64_sparc_fbsd_bed
 936
 937 #include "elf64-target.h"
 938
 939 /* Solaris 2.  */
 940
 941 #undef  TARGET_BIG_SYM
 942 #define TARGET_BIG_SYM                          sparc_elf64_sol2_vec
 943 #undef  TARGET_BIG_NAME
 944 #define TARGET_BIG_NAME                         "elf64-sparc-sol2"
 945
 946 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
 947    objects won't be recognized.  */
 948 #undef  ELF_OSABI
 949
 950 #undef elf64_bed
 951 #define elf64_bed                               elf64_sparc_sol2_bed
 952
 953 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
 954    boundary.  */
 955 #undef elf_backend_static_tls_alignment
 956 #define elf_backend_static_tls_alignment        16
 957
 958 #include "elf64-target.h"