elf64-mips.c

基于4个mips核的noc设计

  rela_hdr = &elf_section_data (sec)->rel_hdr;

  rela_hdr->sh_size = rela_hdr->sh_entsize * count;
  rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size);
  if (rela_hdr->contents == NULL)
    {
      *failedp = true;
      return;
    }

  ext_rela = (Elf64_Mips_External_Rela *) rela_hdr->contents;
  for (idx = 0; idx < sec->reloc_count; idx++, ext_rela++)
    {
      arelent *ptr;
      Elf64_Mips_Internal_Rela int_rela;
      asymbol *sym;
      int n;
      unsigned int i;

      ptr = sec->orelocation[idx];

      /* The address of an ELF reloc is section relative for an object
	 file, and absolute for an executable file or shared library.
	 The address of a BFD reloc is always section relative.  */
      if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
	int_rela.r_offset = ptr->address;
      else
	int_rela.r_offset = ptr->address + sec->vma;

      sym = *ptr->sym_ptr_ptr;
      if (sym == last_sym)
	n = last_sym_idx;
      else
	{
	  last_sym = sym;
	  n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym);
	  if (n < 0)
	    {
	      *failedp = true;
	      return;
	    }
	  last_sym_idx = n;
	}

      int_rela.r_sym = n;

      int_rela.r_addend = ptr->addend;

      int_rela.r_ssym = RSS_UNDEF;

      if ((*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
	  && ! _bfd_elf_validate_reloc (abfd, ptr))
	{
	  *failedp = true;
	  return;
	}

      int_rela.r_type = ptr->howto->type;
      int_rela.r_type2 = (int) R_MIPS_NONE;
      int_rela.r_type3 = (int) R_MIPS_NONE;

      for (i = 0; i < 2; i++)
	{
	  arelent *r;

	  if (idx + 1 >= sec->reloc_count)
	    break;
	  r = sec->orelocation[idx + 1];
	  if (r->address != ptr->address
	      || ! bfd_is_abs_section ((*r->sym_ptr_ptr)->section)
	      || (*r->sym_ptr_ptr)->value != 0)
	    break;

	  /* We can merge the reloc at IDX + 1 with the reloc at IDX.  */

	  if (i == 0)
	    int_rela.r_type2 = r->howto->type;
	  else
	    int_rela.r_type3 = r->howto->type;

	  ++idx;
	}

      mips_elf64_swap_reloca_out (abfd, &int_rela, ext_rela);
    }

  BFD_ASSERT (ext_rela - (Elf64_Mips_External_Rela *) rela_hdr->contents
	      == count);
}

/* Irix 6 defines a brand new archive map format, so that they can
   have archives more than 4 GB in size.  */

/* Read an Irix 6 armap.  */

static boolean
mips_elf64_slurp_armap (abfd)
     bfd *abfd;
{
  struct artdata *ardata = bfd_ardata (abfd);
  char nextname[17];
  file_ptr arhdrpos;
  bfd_size_type i, parsed_size, nsymz, stringsize, carsym_size, ptrsize;
  struct areltdata *mapdata;
  bfd_byte int_buf[8];
  char *stringbase;
  bfd_byte *raw_armap = NULL;
  carsym *carsyms;

  ardata->symdefs = NULL;

  /* Get the name of the first element.  */
  arhdrpos = bfd_tell (abfd);
  i = bfd_read ((PTR) nextname, 1, 16, abfd);
  if (i == 0)
    return true;
  if (i != 16)
    return false;

  if (bfd_seek (abfd, (file_ptr) - 16, SEEK_CUR) != 0)
    return false;

  /* Archives with traditional armaps are still permitted.  */
  if (strncmp (nextname, "/               ", 16) == 0)
    return bfd_slurp_armap (abfd);

  if (strncmp (nextname, "/SYM64/         ", 16) != 0)
    {
      bfd_has_map (abfd) = false;
      return true;
    }

  mapdata = (struct areltdata *) _bfd_read_ar_hdr (abfd);
  if (mapdata == NULL)
    return false;
  parsed_size = mapdata->parsed_size;
  bfd_release (abfd, (PTR) mapdata);

  if (bfd_read (int_buf, 1, 8, abfd) != 8)
    {
      if (bfd_get_error () != bfd_error_system_call)
	bfd_set_error (bfd_error_malformed_archive);
      return false;
    }

  nsymz = bfd_getb64 (int_buf);
  stringsize = parsed_size - 8 * nsymz - 8;

  carsym_size = nsymz * sizeof (carsym);
  ptrsize = 8 * nsymz;

  ardata->symdefs = (carsym *) bfd_zalloc (abfd, carsym_size + stringsize + 1);
  if (ardata->symdefs == NULL)
    return false;
  carsyms = ardata->symdefs;
  stringbase = ((char *) ardata->symdefs) + carsym_size;

  raw_armap = (bfd_byte *) bfd_alloc (abfd, ptrsize);
  if (raw_armap == NULL)
    goto error_return;

  if (bfd_read (raw_armap, 1, ptrsize, abfd) != ptrsize
      || bfd_read (stringbase, 1, stringsize, abfd) != stringsize)
    {
      if (bfd_get_error () != bfd_error_system_call)
	bfd_set_error (bfd_error_malformed_archive);
      goto error_return;
    }

  for (i = 0; i < nsymz; i++)
    {
      carsyms->file_offset = bfd_getb64 (raw_armap + i * 8);
      carsyms->name = stringbase;
      stringbase += strlen (stringbase) + 1;
      ++carsyms;
    }
  *stringbase = '\0';

  ardata->symdef_count = nsymz;
  ardata->first_file_filepos = arhdrpos + sizeof (struct ar_hdr) + parsed_size;

  bfd_has_map (abfd) = true;
  bfd_release (abfd, raw_armap);

  return true;

 error_return:
  if (raw_armap != NULL)
    bfd_release (abfd, raw_armap);
  if (ardata->symdefs != NULL)
    bfd_release (abfd, ardata->symdefs);
  return false;
}

/* Write out an Irix 6 armap.  The Irix 6 tools are supposed to be
   able to handle ordinary ELF armaps, but at least on Irix 6.2 the
   linker crashes.  */

static boolean
mips_elf64_write_armap (arch, elength, map, symbol_count, stridx)
     bfd *arch;
     unsigned int elength;
     struct orl *map;
     unsigned int symbol_count;
     int stridx;
{
  unsigned int ranlibsize = (symbol_count * 8) + 8;
  unsigned int stringsize = stridx;
  unsigned int mapsize = stringsize + ranlibsize;
  file_ptr archive_member_file_ptr;
  bfd *current = arch->archive_head;
  unsigned int count;
  struct ar_hdr hdr;
  unsigned int i;
  int padding;
  bfd_byte buf[8];

  padding = BFD_ALIGN (mapsize, 8) - mapsize;
  mapsize += padding;

  /* work out where the first object file will go in the archive */
  archive_member_file_ptr = (mapsize
			     + elength
			     + sizeof (struct ar_hdr)
			     + SARMAG);

  memset ((char *) (&hdr), 0, sizeof (struct ar_hdr));
  strcpy (hdr.ar_name, "/SYM64/");
  sprintf (hdr.ar_size, "%-10d", (int) mapsize);
  sprintf (hdr.ar_date, "%ld", (long) time (NULL));
  /* This, at least, is what Intel coff sets the values to.: */
  sprintf ((hdr.ar_uid), "%d", 0);
  sprintf ((hdr.ar_gid), "%d", 0);
  sprintf ((hdr.ar_mode), "%-7o", (unsigned) 0);
  strncpy (hdr.ar_fmag, ARFMAG, 2);

  for (i = 0; i < sizeof (struct ar_hdr); i++)
    if (((char *) (&hdr))[i] == '\0')
      (((char *) (&hdr))[i]) = ' ';

  /* Write the ar header for this item and the number of symbols */

  if (bfd_write ((PTR) &hdr, 1, sizeof (struct ar_hdr), arch)
      != sizeof (struct ar_hdr))
    return false;

  bfd_putb64 (symbol_count, buf);
  if (bfd_write (buf, 1, 8, arch) != 8)
    return false;

  /* Two passes, first write the file offsets for each symbol -
     remembering that each offset is on a two byte boundary.  */

  /* Write out the file offset for the file associated with each
     symbol, and remember to keep the offsets padded out.  */

  current = arch->archive_head;
  count = 0;
  while (current != (bfd *) NULL && count < symbol_count)
    {
      /* For each symbol which is used defined in this object, write out
	 the object file's address in the archive */

      while (((bfd *) (map[count]).pos) == current)
	{
	  bfd_putb64 (archive_member_file_ptr, buf);
	  if (bfd_write (buf, 1, 8, arch) != 8)
	    return false;
	  count++;
	}
      /* Add size of this archive entry */
      archive_member_file_ptr += (arelt_size (current)
				  + sizeof (struct ar_hdr));
      /* remember about the even alignment */
      archive_member_file_ptr += archive_member_file_ptr % 2;
      current = current->next;
    }

  /* now write the strings themselves */
  for (count = 0; count < symbol_count; count++)
    {
      size_t len = strlen (*map[count].name) + 1;

      if (bfd_write (*map[count].name, 1, len, arch) != len)
	return false;
    }

  /* The spec says that this should be padded to an 8 byte boundary.
     However, the Irix 6.2 tools do not appear to do this.  */
  while (padding != 0)
    {
      if (bfd_write ("", 1, 1, arch) != 1)
	return false;
      --padding;
    }

  return true;
}

/* ECOFF swapping routines.  These are used when dealing with the
   .mdebug section, which is in the ECOFF debugging format.  */
static const struct ecoff_debug_swap mips_elf64_ecoff_debug_swap =
{
  /* Symbol table magic number.  */
  magicSym2,
  /* Alignment of debugging information.  E.g., 4.  */
  8,
  /* Sizes of external symbolic information.  */
  sizeof (struct hdr_ext),
  sizeof (struct dnr_ext),
  sizeof (struct pdr_ext),
  sizeof (struct sym_ext),
  sizeof (struct opt_ext),
  sizeof (struct fdr_ext),
  sizeof (struct rfd_ext),
  sizeof (struct ext_ext),
  /* Functions to swap in external symbolic data.  */
  ecoff_swap_hdr_in,
  ecoff_swap_dnr_in,
  ecoff_swap_pdr_in,
  ecoff_swap_sym_in,
  ecoff_swap_opt_in,
  ecoff_swap_fdr_in,
  ecoff_swap_rfd_in,
  ecoff_swap_ext_in,
  _bfd_ecoff_swap_tir_in,
  _bfd_ecoff_swap_rndx_in,
  /* Functions to swap out external symbolic data.  */
  ecoff_swap_hdr_out,
  ecoff_swap_dnr_out,
  ecoff_swap_pdr_out,
  ecoff_swap_sym_out,
  ecoff_swap_opt_out,
  ecoff_swap_fdr_out,
  ecoff_swap_rfd_out,
  ecoff_swap_ext_out,
  _bfd_ecoff_swap_tir_out,
  _bfd_ecoff_swap_rndx_out,
  /* Function to read in symbolic data.  */
  _bfd_mips_elf_read_ecoff_info
};

/* Relocations in the 64 bit MIPS ELF ABI are more complex than in
   standard ELF.  This structure is used to redirect the relocation
   handling routines.  */

const struct elf_size_info mips_elf64_size_info =
{
  sizeof (Elf64_External_Ehdr),
  sizeof (Elf64_External_Phdr),
  sizeof (Elf64_External_Shdr),
  sizeof (Elf64_Mips_External_Rel),
  sizeof (Elf64_Mips_External_Rela),
  sizeof (Elf64_External_Sym),
  sizeof (Elf64_External_Dyn),
  sizeof (Elf_External_Note),
  4,            /* hash-table entry size */
  3,            /* internal relocations per external relocations */
  64,		/* arch_size */
  8,		/* file_align */
  ELFCLASS64,
  EV_CURRENT,
  bfd_elf64_write_out_phdrs,
  bfd_elf64_write_shdrs_and_ehdr,
  mips_elf64_write_relocs,
  bfd_elf64_swap_symbol_out,
  mips_elf64_slurp_reloc_table,
  bfd_elf64_slurp_symbol_table,
  bfd_elf64_swap_dyn_in,
  bfd_elf64_swap_dyn_out,
  mips_elf64_be_swap_reloc_in,
  mips_elf64_be_swap_reloc_out,
  mips_elf64_be_swap_reloca_in,
  mips_elf64_be_swap_reloca_out
};

#define TARGET_LITTLE_SYM		bfd_elf64_littlemips_vec
#define TARGET_LITTLE_NAME		"elf64-littlemips"
#define TARGET_BIG_SYM			bfd_elf64_bigmips_vec
#define TARGET_BIG_NAME			"elf64-bigmips"
#define ELF_ARCH			bfd_arch_mips
#define ELF_MACHINE_CODE		EM_MIPS

#define ELF_MAXPAGESIZE			0x1000

#define elf_backend_collect		true
#define elf_backend_type_change_ok	true
#define elf_backend_can_gc_sections	true
#define elf_backend_size_info		mips_elf64_size_info
#define elf_backend_object_p		_bfd_mips_elf_object_p
#define elf_backend_section_from_shdr	_bfd_mips_elf_section_from_shdr
#define elf_backend_fake_sections	_bfd_mips_elf_fake_sections
#define elf_backend_section_from_bfd_section \
					_bfd_mips_elf_section_from_bfd_section
#define elf_backend_section_processing	_bfd_mips_elf_section_processing
#define elf_backend_symbol_processing	_bfd_mips_elf_symbol_processing
#define elf_backend_additional_program_headers \
					_bfd_mips_elf_additional_program_headers
#define elf_backend_modify_segment_map	_bfd_mips_elf_modify_segment_map
#define elf_backend_final_write_processing \
					_bfd_mips_elf_final_write_processing
#define elf_backend_ecoff_debug_swap	&mips_elf64_ecoff_debug_swap
#define elf_backend_add_symbol_hook	_bfd_mips_elf_add_symbol_hook
#define elf_backend_create_dynamic_sections \
					_bfd_mips_elf_create_dynamic_sections
#define elf_backend_check_relocs	_bfd_mips_elf_check_relocs
#define elf_backend_adjust_dynamic_symbol \
					_bfd_mips_elf_adjust_dynamic_symbol
#define elf_backend_always_size_sections \
					_bfd_mips_elf_always_size_sections
#define elf_backend_size_dynamic_sections \
					_bfd_mips_elf_size_dynamic_sections
#define elf_backend_relocate_section    _bfd_mips_elf_relocate_section
#define elf_backend_link_output_symbol_hook \
					_bfd_mips_elf_link_output_symbol_hook
#define elf_backend_finish_dynamic_symbol \
					_bfd_mips_elf_finish_dynamic_symbol
#define elf_backend_finish_dynamic_sections \
					_bfd_mips_elf_finish_dynamic_sections
#define elf_backend_gc_mark_hook	_bfd_mips_elf_gc_mark_hook
#define elf_backend_gc_sweep_hook	_bfd_mips_elf_gc_sweep_hook
#define elf_backend_got_header_size	(4*MIPS_RESERVED_GOTNO)
#define elf_backend_plt_header_size	0
#define elf_backend_may_use_rel_p       1

/* We don't set bfd_elf64_bfd_is_local_label_name because the 32-bit
   MIPS-specific function only applies to IRIX5, which had no 64-bit
   ABI.  */
#define bfd_elf64_find_nearest_line	_bf