Exemple #1
0
static void
s_segm (int segm)
{
  if (segm)
    {
      segmented_mode = 1;
      bfd_set_arch_mach (stdoutput, TARGET_ARCH, bfd_mach_z8001);
    }
  else
    {
      segmented_mode = 0;
      bfd_set_arch_mach (stdoutput, TARGET_ARCH, bfd_mach_z8002);
    }
}
Exemple #2
0
static void
MY(set_arch_mach)(bfd *abfd, unsigned long machtype)
{
  enum bfd_architecture arch;
  unsigned int machine;

  /* Determine the architecture and machine type of the object file.  */
  switch (machtype)
    {
    case M_MIPS1:
      arch = bfd_arch_mips;
      machine = bfd_mach_mips3000;
      break;
    case M_MIPS2:
      arch = bfd_arch_mips;
      machine = bfd_mach_mips4000;
      break;
    default:
      arch = bfd_arch_obscure;
      machine = 0;
      break;
    }

  bfd_set_arch_mach(abfd, arch, machine);
}
Exemple #3
0
static void
xc16xlmode (int arg ATTRIBUTE_UNUSED)
{
 if (stdoutput != NULL)
  if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16xl))
    as_warn (_("could not set architecture and machine"));
}
void
NAME(lynx,set_arch_mach)(bfd *abfd, unsigned long machtype)
{
  /* Determine the architecture and machine type of the object file: */
  enum bfd_architecture arch;
  unsigned long machine;

  switch (machtype)
    {
    case M_UNKNOWN:
      /* Some Sun3s make magic numbers without cpu types in them, so
	 we'll default to the 68000.  */
      arch = bfd_arch_m68k;
      machine = bfd_mach_m68000;
      break;

    case M_68010:
    case M_HP200:
      arch = bfd_arch_m68k;
      machine = bfd_mach_m68010;
      break;

    case M_68020:
    case M_HP300:
      arch = bfd_arch_m68k;
      machine = bfd_mach_m68020;
      break;

    case M_SPARC:
      arch = bfd_arch_sparc;
      machine = 0;
      break;

    case M_386:
    case M_386_DYNIX:
      arch = bfd_arch_i386;
      machine = 0;
      break;

    case M_29K:
      arch = bfd_arch_a29k;
      machine = 0;
      break;

    case M_HPUX:
      arch = bfd_arch_m68k;
      machine = 0;
      break;

    default:
      arch = bfd_arch_obscure;
      machine = 0;
      break;
    }
  bfd_set_arch_mach (abfd, arch, machine);
}
Exemple #5
0
bfd *
create_gcore_bfd (char *filename)
{
  bfd *obfd = gdb_bfd_openw (filename, default_gcore_target ());

  if (!obfd)
    error (_("Failed to open '%s' for output."), filename);
  bfd_set_format (obfd, bfd_core);
  bfd_set_arch_mach (obfd, default_gcore_arch (), default_gcore_mach ());
  return obfd;
}
Exemple #6
0
bfd_boolean
bfd_arm_merge_machines (bfd *ibfd, bfd *obfd)
{
  unsigned int in  = bfd_get_mach (ibfd);
  unsigned int out = bfd_get_mach (obfd);

  /* If the output architecture is unknown, we now have a value to set.  */
  if (out == bfd_mach_arm_unknown)
    bfd_set_arch_mach (obfd, bfd_arch_arm, in);

  /* If the input architecture is unknown,
     then so must be the output architecture.  */
  else if (in == bfd_mach_arm_unknown)
    /* FIXME: We ought to have some way to
       override this on the command line.  */
    bfd_set_arch_mach (obfd, bfd_arch_arm, bfd_mach_arm_unknown);

  /* If they are the same then nothing needs to be done.  */
  else if (out == in)
    ;

  /* Otherwise the general principle that a earlier architecture can be
     linked with a later architecture to produce a binary that will execute
     on the later architecture.

     We fail however if we attempt to link a Cirrus EP9312 binary with an
     Intel XScale binary, since these architecture have co-processors which
     will not both be present on the same physical hardware.  */
  else if (in == bfd_mach_arm_ep9312
	   && (out == bfd_mach_arm_XScale
	       || out == bfd_mach_arm_iWMMXt
	       || out == bfd_mach_arm_iWMMXt2))
    {
      _bfd_error_handler (_("\
error: %B is compiled for the EP9312, whereas %B is compiled for XScale"),
			  ibfd, obfd);
      bfd_set_error (bfd_error_wrong_format);
      return FALSE;
    }
void
md_begin (void)
{
  int count;
  const bexkat1_opc_info_t *opcode;
  opcode_hash_control = hash_new();

  bfd_set_arch_mach(stdoutput, TARGET_ARCH, 0);

  opcode = bexkat1_opc_info;
  for (count=0; count < bexkat1_opc_count; count++) {
    hash_insert(opcode_hash_control, opcode->name, (char *)opcode);
    opcode++;
  }
}
Exemple #8
0
static bfd_boolean
elf32_sparc_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
{
  bfd *obfd = info->output_bfd;
  bfd_boolean error;
  unsigned long ibfd_mach;
  /* FIXME: This should not be static.  */
  static unsigned long previous_ibfd_e_flags = (unsigned long) -1;

  if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
    return TRUE;

  error = FALSE;

  ibfd_mach = bfd_get_mach (ibfd);
  if (bfd_mach_sparc_64bit_p (ibfd_mach))
    {
      error = TRUE;
      _bfd_error_handler
	(_("%B: compiled for a 64 bit system and target is 32 bit"), ibfd);
    }
  else if ((ibfd->flags & DYNAMIC) == 0)
    {
      if (bfd_get_mach (obfd) < ibfd_mach)
	bfd_set_arch_mach (obfd, bfd_arch_sparc, ibfd_mach);
    }

  if (((elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA)
       != previous_ibfd_e_flags)
      && previous_ibfd_e_flags != (unsigned long) -1)
    {
      _bfd_error_handler
	(_("%B: linking little endian files with big endian files"), ibfd);
      error = TRUE;
    }
  previous_ibfd_e_flags = elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA;

  if (error)
    {
      bfd_set_error (bfd_error_bad_value);
      return FALSE;
    }

  return _bfd_sparc_elf_merge_private_bfd_data (ibfd, info);
}
static const bfd_target *
os9k_callback (bfd *abfd)
{
  struct internal_exec *execp = exec_hdr (abfd);
  unsigned long bss_start;

  /* Architecture and machine type.  */
  bfd_set_arch_mach (abfd, bfd_arch_i386, 0);

  /* The positions of the string table and symbol table.  */
  obj_str_filepos (abfd) = 0;
  obj_sym_filepos (abfd) = 0;

  /* The alignments of the sections.  */
  obj_textsec (abfd)->alignment_power = execp->a_talign;
  obj_datasec (abfd)->alignment_power = execp->a_dalign;
  obj_bsssec (abfd)->alignment_power = execp->a_balign;

  /* The starting addresses of the sections.  */
  obj_textsec (abfd)->vma = execp->a_tload;
  obj_datasec (abfd)->vma = execp->a_dload;

  /* And reload the sizes, since the aout module zaps them.  */
  obj_textsec (abfd)->size = execp->a_text;

  bss_start = execp->a_dload + execp->a_data;	/* BSS = end of data section.  */
  obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);

  /* The file positions of the sections.  */
  obj_textsec (abfd)->filepos = execp->a_entry;
  obj_datasec (abfd)->filepos = execp->a_dload;

  /* The file positions of the relocation info ***
  obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
  obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);  */

  adata (abfd).page_size = 1;	/* Not applicable.  */
  adata (abfd).segment_size = 1;/* Not applicable.  */
  adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;

  return abfd->xvec;
}
Exemple #10
0
void
output_file_create (char *name)
{
  if (name[0] == '-' && name[1] == '\0')
    as_fatal (_("can't open a bfd on stdout %s"), name);

  else if (!(stdoutput = bfd_openw (name, TARGET_FORMAT)))
    {
      bfd_error_type err = bfd_get_error ();

      if (err == bfd_error_invalid_target)
	as_fatal (_("selected target format '%s' unknown"), TARGET_FORMAT);
      else
	as_fatal (_("can't create %s: %s"), name, bfd_errmsg (err));
    }

  bfd_set_format (stdoutput, bfd_object);
  bfd_set_arch_mach (stdoutput, TARGET_ARCH, TARGET_MACH);
  if (flag_traditional_format)
    stdoutput->flags |= BFD_TRADITIONAL_FORMAT;
}
Exemple #11
0
void
md_begin (void)
{
  int count;
  const moxie_opc_info_t *opcode;
  opcode_hash_control = hash_new ();

  /* Insert names into hash table.  */
  for (count = 0, opcode = moxie_form1_opc_info; count++ < 64; opcode++)
    hash_insert (opcode_hash_control, opcode->name, (char *) opcode);

  for (count = 0, opcode = moxie_form2_opc_info; count++ < 4; opcode++)
    hash_insert (opcode_hash_control, opcode->name, (char *) opcode);

  for (count = 0, opcode = moxie_form3_opc_info; count++ < 10; opcode++)
    hash_insert (opcode_hash_control, opcode->name, (char *) opcode);

  target_big_endian = TARGET_BYTES_BIG_ENDIAN;

  bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0);
}
Exemple #12
0
static const bfd_target *
aout_adobe_callback (bfd *abfd)
{
  struct internal_exec *execp = exec_hdr (abfd);
  asection *sect;
  struct external_segdesc ext[1];
  char *section_name;
  char try_again[30];	/* Name and number.  */
  char *newname;
  int trynum;
  flagword flags;

  /* Architecture and machine type -- unknown in this format.  */
  bfd_set_arch_mach (abfd, bfd_arch_unknown, 0L);

  /* The positions of the string table and symbol table.  */
  obj_str_filepos (abfd) = N_STROFF (*execp);
  obj_sym_filepos (abfd) = N_SYMOFF (*execp);

  /* Suck up the section information from the file, one section at a time.  */
  for (;;)
    {
      bfd_size_type amt = sizeof (*ext);
      if (bfd_bread ( ext, amt, abfd) != amt)
	{
	  if (bfd_get_error () != bfd_error_system_call)
	    bfd_set_error (bfd_error_wrong_format);

	  return NULL;
	}
      switch (ext->e_type[0])
	{
	case N_TEXT:
	  section_name = ".text";
	  flags = SEC_CODE | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
	  break;

	case N_DATA:
	  section_name = ".data";
	  flags = SEC_DATA | SEC_LOAD | SEC_ALLOC | SEC_HAS_CONTENTS;
	  break;

	case N_BSS:
	  section_name = ".bss";
	  flags = SEC_DATA | SEC_HAS_CONTENTS;
	  break;

	case 0:
	  goto no_more_sections;

	default:
	  (*_bfd_error_handler)
	    (_("%B: Unknown section type in a.out.adobe file: %x\n"),
	     abfd, ext->e_type[0]);
	  goto no_more_sections;
	}

      /* First one is called ".text" or whatever; subsequent ones are
	 ".text1", ".text2", ...  */
      bfd_set_error (bfd_error_no_error);
      sect = bfd_make_section_with_flags (abfd, section_name, flags);
      trynum = 0;

      while (!sect)
	{
	  if (bfd_get_error () != bfd_error_no_error)
	    /* Some other error -- slide into the sunset.  */
	    return NULL;
	  sprintf (try_again, "%s%d", section_name, ++trynum);
	  sect = bfd_make_section_with_flags (abfd, try_again, flags);
	}

      /* Fix the name, if it is a sprintf'd name.  */
      if (sect->name == try_again)
	{
	  amt = strlen (sect->name);
	  newname = bfd_zalloc (abfd, amt);
	  if (newname == NULL)
	    return NULL;
	  strcpy (newname, sect->name);
	  sect->name = newname;
	}

      /* Assumed big-endian.  */
      sect->size = ((ext->e_size[0] << 8)
		    | ext->e_size[1] << 8
		    | ext->e_size[2]);
      sect->vma = H_GET_32 (abfd, ext->e_virtbase);
      sect->filepos = H_GET_32 (abfd, ext->e_filebase);
      /* FIXME XXX alignment?  */

      /* Set relocation information for first section of each type.  */
      if (trynum == 0)
	switch (ext->e_type[0])
	  {
	  case N_TEXT:
	    sect->rel_filepos = N_TRELOFF (*execp);
	    sect->reloc_count = execp->a_trsize;
	    break;

	  case N_DATA:
	    sect->rel_filepos = N_DRELOFF (*execp);
	    sect->reloc_count = execp->a_drsize;
	    break;

	  default:
	    break;
	  }
    }
 no_more_sections:

  adata (abfd).reloc_entry_size = sizeof (struct reloc_std_external);
  adata (abfd).symbol_entry_size = sizeof (struct external_nlist);
  adata (abfd).page_size = 1; /* Not applicable.  */
  adata (abfd).segment_size = 1; /* Not applicable.  */
  adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;

  return abfd->xvec;
}
Exemple #13
0
static void
gcore_command (char *args, int from_tty)
{
  struct cleanup *old_chain;
  char *corefilename, corefilename_buffer[40];
  asection *note_sec = NULL;
  bfd *obfd;
  void *note_data = NULL;
  int note_size = 0;

  /* No use generating a corefile without a target process.  */
  if (!target_has_execution)
    noprocess ();

  if (args && *args)
    corefilename = args;
  else
    {
      /* Default corefile name is "core.PID".  */
      sprintf (corefilename_buffer, "core.%d", PIDGET (inferior_ptid));
      corefilename = corefilename_buffer;
    }

  if (info_verbose)
    fprintf_filtered (gdb_stdout,
		      "Opening corefile '%s' for output.\n", corefilename);

  /* Open the output file.  */
  obfd = bfd_openw (corefilename, default_gcore_target ());
  if (!obfd)
    error (_("Failed to open '%s' for output."), corefilename);

  /* Need a cleanup that will close the file (FIXME: delete it?).  */
  old_chain = make_cleanup_bfd_close (obfd);

  bfd_set_format (obfd, bfd_core);
  bfd_set_arch_mach (obfd, default_gcore_arch (), default_gcore_mach ());

  /* An external target method must build the notes section.  */
  note_data = target_make_corefile_notes (obfd, &note_size);

  /* Create the note section.  */
  if (note_data != NULL && note_size != 0)
    {
      note_sec = bfd_make_section_anyway_with_flags (obfd, "note0",
						     SEC_HAS_CONTENTS
						     | SEC_READONLY
						     | SEC_ALLOC);
      if (note_sec == NULL)
	error (_("Failed to create 'note' section for corefile: %s"),
	       bfd_errmsg (bfd_get_error ()));

      bfd_set_section_vma (obfd, note_sec, 0);
      bfd_set_section_alignment (obfd, note_sec, 0);
      bfd_set_section_size (obfd, note_sec, note_size);
    }

  /* Now create the memory/load sections.  */
  if (gcore_memory_sections (obfd) == 0)
    error (_("gcore: failed to get corefile memory sections from target."));

  /* Write out the contents of the note section.  */
  if (note_data != NULL && note_size != 0)
    {
      if (!bfd_set_section_contents (obfd, note_sec, note_data, 0, note_size))
	warning (_("writing note section (%s)"), bfd_errmsg (bfd_get_error ()));
    }

  /* Succeeded.  */
  fprintf_filtered (gdb_stdout, "Saved corefile %s\n", corefilename);

  /* Clean-ups will close the output file and free malloc memory.  */
  do_cleanups (old_chain);
  return;
}
Exemple #14
0
static void emit_so_bfd(const Chunk *base, uint64_t textOffs, uint64_t textLen,
                        std::vector<MethBlock> &blocks,
                        std::vector<DebugInfo> &debugInfos)
{
    bfd_init();

    bfd *abfd = bfd_openw("jit.o",
#ifdef __MACH__
                          "mach-o-i386"
#else
                          "elf32-i386"
#endif
)                          ;

    bfd_set_format(abfd, bfd_object);
#ifdef __MACH__
    bfd_set_arch_mach(abfd, bfd_arch_i386, bfd_mach_i386_i386);
#else
    bfd_set_arch_mach(abfd, bfd_arch_i386, bfd_mach_i386_i386);
#endif

    asection *textSection = bfd_make_section(abfd, ".text");

    bfd_set_section_flags(
            abfd, textSection,
            SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_HAS_CONTENTS);
#ifdef __MACH__
    bfd_set_section_size(abfd, textSection, textLen);
    // for mach-o, the .o we generate is linked into a .dylib
    // so just set the alignment to make sure things end up
    // in the right place after link
    textSection->alignment_power = l2(textOffs);

    static const uint64_t textAdj = 0;
#else
    bfd_set_section_size(abfd, textSection, textLen + textOffs);

    // for linux (and oprofile) the generated object is used
    // directly, so just offset the symbols
    uint64_t textAdj = textOffs;
#endif

    asymbol **symbols = (asymbol **) malloc(
            sizeof(asymbol *) * (6 + blocks.size()));
    uint64_t start = ((uint64_t *) base->data)[0] + textOffs;

    int n = 0;
    std::map<std::string, int> namesSeen;

    std::vector<MethBlock>::const_iterator i, e;

    symbols[n++] = make_glob_symbol(abfd, "__jitStart", textSection, textAdj);
    symbols[n++] = make_glob_symbol(abfd, "_jitStart", textSection, textAdj);

    for (i = blocks.begin(), e = blocks.end(); i != e; i++, n++) {
        std::string name = i->name();
        int seen = namesSeen[name]++;

        if (seen) {
            char buf[16];

            sprintf(buf, " (%d)", seen);
            name += buf;
        }
        symbols[n] = make_glob_symbol(abfd, name.c_str(), textSection,
                                      i->start() - start + textAdj);
    }
    symbols[n++] = make_glob_symbol(abfd, "__jitUnused", textSection,
                                    blocks.back().end() - start + textAdj);
    symbols[n++] = make_glob_symbol(abfd, "_jitUnused", textSection,
                                    blocks.back().end() - start + textAdj);
    symbols[n++] = make_glob_symbol(abfd, "__jitEnd", textSection,
                                    textLen + textAdj);
    symbols[n++] = make_glob_symbol(abfd, "_jitEnd", textSection,
                                    textLen + textAdj);

    bfd_set_symtab(abfd, symbols, n);

    for (i = blocks.begin(), e = blocks.end(); i != e; i++, n++)
        if (i->codeBytes())
            bfd_set_section_contents(abfd, textSection, i->codeBytes(),
                                     i->start() - start, i->codeLen());

    bfd_close(abfd);

    for (int n = 0; n < blocks.size(); n++)
        free((void *) symbols[n]->name);
    free(symbols);
}
main (int argc, char **argv) {
    bfd *ibfd, *obfd;
    asection *p;
    static asymbol **osympp, **delsympp;
    long symsize, symcount, delsymcount;
    int i;
    int c;
    int idx;
    struct add_reloc_struct *new_reloc;
    struct change_reloc_struct *new_change;
    struct delete_reloc_struct *new_delete;
    struct modify_byte_struct *new_modify;
    struct globalize_sym_struct *new_globalize;

    while ((c = getopt (argc, argv, "a:d:c:m:G:")) != -1) {
	switch (c) {
	    case 'a':
		/* check to see if we have two args: name and loc */
		if ((index(optarg, ',') == NULL) ||
		    (index(optarg, ',') != rindex(optarg, ','))) {
		    fprintf(stderr, "usage: -a argument should be <symbolname>,<location>, not \"%s\"\n", optarg);
		    exit(1);
		}
		/* record the add reloc command in the global array */
		new_reloc = (add_reloc_struct *)malloc(sizeof(add_reloc_struct));
		new_reloc->symbol_name = strndup(optarg, (index(optarg, ',') - optarg));
		new_reloc->loc = strtol(index(optarg, ',') + 1, NULL, 0);
		if (errno == EINVAL) {
		    fprintf(stderr, "the value %s is not a valid location for the add command\n", index(optarg, ',') + 1);
		    exit(1);
		}
		new_reloc->next = additional_relocs;
		additional_relocs = new_reloc;
		break;

	    case 'c':
		/* check to see if we have two args */
		if ((index(optarg, ',') == NULL) ||
		    (index(optarg, ',') != rindex(optarg, ','))) {
		    fprintf(stderr, "usage: -c argument should be <symbolname>,<symbolname>, not \"%s\"\n", optarg);
		    exit(1);
		}
		new_change = (change_reloc_struct *)malloc(sizeof(change_reloc_struct));
		new_change->old_symbol_name = strndup(optarg, strlen(optarg) - strlen(index(optarg, ',')));
		new_change->new_symbol_name = strdup(index(optarg, ',') + 1);
		new_change->next = change_relocs;
		change_relocs = new_change;
		break;

	    case 'd':
		new_delete = (delete_reloc_struct *)malloc(sizeof(delete_reloc_struct));
		new_delete->symbol_name = strdup(optarg);
		new_delete->next = delete_relocs;
		delete_relocs = new_delete;
		break;

	    case 'm':
		if ((index(optarg, '=') == NULL) ||
		    (index(optarg, '=') != rindex(optarg, '='))) {
		    fprintf(stderr, "usage: -m argument should be <location>=<value>, not \"%s\"\n", optarg);
		    exit(1);
		}
		new_modify = (modify_byte_struct *)malloc(sizeof(modify_byte_struct));
		new_modify->location = strtol(optarg, NULL, 0);
		new_modify->value = strtol(index(optarg, '=') + 1, NULL, 0);
		if (new_modify->value > 0xff) {
		    fprintf(stderr, "requested modify value %lx for location %lx exceeds 0xff\n",
			    new_modify->value, new_modify->location);
		    exit(1);
		}
		new_modify->next = modify_bytes;
		modify_bytes = new_modify;
		break;

	    case 'G':
		new_globalize = (globalize_sym_struct *)malloc(sizeof(globalize_sym_struct));
		new_globalize->symbol_name = strdup(optarg);
		new_globalize->next = globalize_syms;
		globalize_syms = new_globalize;
		break;

	    default:
		fprintf(stderr, "unrecognized argument character |%c|\n", c);
	}
    }

    if ((argc - optind) != 2) {
	fprintf(stderr, "usage: fixup_relocs [-a newsymbol,location] [-c oldsymbol,newsymbol] [-d symbol] infile.o outfile.o\n");
	exit(1);
    }

    ibfd = bfd_openr(argv[optind], NULL);
    if (ibfd == NULL) {
	bfd_perror("while opening input object file");
	exit(1);
    }

    /* if I don't do "check_format", there's no data in the bfd object.  wtf? */
    if (!bfd_check_format(ibfd, bfd_object)) {
	fprintf(stderr, "input file %s seems to NOT be an object file! exiting.\n", argv[optind]);
	exit(1);
    }

    obfd = bfd_openw(argv[optind+1], bfd_get_target(ibfd));
    if (obfd == NULL) {
	bfd_perror("while opening output object file");
	exit(1);
    }

    if (!bfd_set_format(obfd, bfd_get_format(ibfd))) {
	bfd_perror("while setting output object file format");
    }

    /* copy a bunch of necessary global stuff */
    bfd_set_start_address(obfd, bfd_get_start_address(ibfd));
    bfd_set_file_flags(obfd, bfd_get_file_flags(ibfd));
    bfd_set_arch_mach(obfd, bfd_get_arch(ibfd), bfd_get_mach(ibfd));
    /* BOZO objcopy sets format again at this point.  why? */

    bfd_map_over_sections (ibfd, setup_section, obfd);

    setup_bfd_headers (ibfd, obfd);

    /* Symbol filtering must happen after the output sections
       have been created, but before their contents are set.  */
    symsize = bfd_get_symtab_upper_bound (ibfd);
    if (symsize < 0) {
	fprintf(stderr, "problem processing %s\n", bfd_get_filename (ibfd));
	return FALSE;
    }

    /* count the added relocations so we can put extra space in the output symbol table for them */
    int reloc_add_cnt, reloc_delete_cnt;
    reloc_add_cnt = 0;
    reloc_delete_cnt = 0;
    for (new_reloc = additional_relocs; new_reloc != NULL; new_reloc = new_reloc->next) {
	reloc_add_cnt++;
    }
    /* the "change" symbols might also not be in the symbol table yet */
    for (new_change = change_relocs; new_change != NULL; new_change = new_change->next) {
	reloc_add_cnt++;
	/* the old symbol may be deleted, also */
	reloc_delete_cnt++;
    }
    for (new_delete = delete_relocs; new_delete != NULL; new_delete = new_delete->next) {
	reloc_delete_cnt++;
    }

    /* filter symbol table in two steps: */
    /* 1) move symbols bound for deletion to the end of the output symbol table array */
    /* 2) truncate the table at the first of those */
    /* this makes it possible to do the reloc processing with the symbol table intact, */
    /* and remove the deleted symbols afterwards, without corrupting the reloc data structures */
    isympp = malloc (symsize);
    osympp = malloc (symsize + reloc_add_cnt * sizeof(asymbol *));
    delsympp = malloc (reloc_delete_cnt * sizeof(asymbol *));
    symcount = bfd_canonicalize_symtab (ibfd, isympp);

    if (symcount < 0) {
	fprintf(stderr, "problem processing %s\n", bfd_get_filename (ibfd));
	return FALSE;
    }

    /* remove any undefined symbols whose relocation entries were deleted or changed */
    int osym_idx, delsym_idx;
    osym_idx = delsym_idx = 0;
    delsymcount = 0;
    for (i = 0; i < symcount; i++) {
	if ((is_delete_reloc(bfd_asymbol_name(isympp[i]), delete_relocs) ||
	     (find_change_reloc(bfd_asymbol_name(isympp[i]), change_relocs) != NULL)) &&
	    (isympp[i]->section != NULL) &&
	    (strcmp(isympp[i]->section->name, BFD_UND_SECTION_NAME) == 0)) {
	    delsympp[delsym_idx++] = isympp[i];
	}
	else {
	    if (is_globalize_sym(bfd_asymbol_name(isympp[i]), globalize_syms)) {
		isympp[i]->flags = BSF_GLOBAL;
	    }
	    osympp[osym_idx++] = isympp[i];
	}
    }
    symcount = osym_idx;
    delsymcount = delsym_idx;
    osympp[symcount] = NULL;

    /* add the symbols for additional relocs to the table */
    int added_symbol_cnt = 0;
    for (new_reloc = additional_relocs; new_reloc != NULL; new_reloc = new_reloc->next) {
	if (find_symbol(osympp, new_reloc->symbol_name) < 0) {
	    /* not yet present, so add it */
	    asymbol *new_sym;
	    new_sym = bfd_make_empty_symbol(obfd);
	    new_sym->name = strdup(new_reloc->symbol_name);
	    new_sym->section = bfd_get_section_by_name (obfd, ".text");
	    new_sym->value = new_reloc->loc;
	    new_sym->flags = BSF_GLOBAL;
	    osympp[symcount + added_symbol_cnt++] = new_sym;
	    osympp[symcount + added_symbol_cnt] = NULL;
	}
    }

    /* do the same for changed relocs */
    for (new_change = change_relocs; new_change != NULL; new_change = new_change->next) {
	if (find_symbol(osympp, new_change->new_symbol_name) < 0) {
	    /* not yet present, so add it */
	    /* since this is a name change, we will reuse the existing address (value field of reloc) */
	    int old_symbol_idx;
	    if ((old_symbol_idx = find_symbol(isympp, new_change->old_symbol_name)) < 0) {
		fprintf(stderr, "change command old symbol name %s not found in symbol table! Exiting.\n", new_change->old_symbol_name);
		exit(1);
	    }
	    asymbol *new_sym;
	    new_sym = bfd_make_empty_symbol(obfd);
	    new_sym->name = strdup(new_change->new_symbol_name);
	    new_sym->section = bfd_und_section_ptr;
	    new_sym->value = isympp[old_symbol_idx]->value;
	    new_sym->flags = BSF_GLOBAL;
	    fprintf(stderr, "adding new symbol %s for change reloc command\n", new_sym->name);
	    osympp[symcount + added_symbol_cnt++] = new_sym;
	    osympp[symcount + added_symbol_cnt] = NULL;
	}
    }

    /* append the soon-to-be deleted symbols to the end of the output symbol table */
    for (i = 0; i < delsymcount; i++) {
	osympp[symcount + added_symbol_cnt + i] = delsympp[i];
    }
    osympp[symcount + added_symbol_cnt + delsymcount] = NULL;

    bfd_set_symtab (obfd, osympp, symcount + added_symbol_cnt + delsymcount);

    /* This has to happen after the symbol table has been set.  */
    bfd_map_over_sections (ibfd, copy_section_relocs_edit, obfd);

    /* now truncate the symbol table to eliminate the deleted symbols */
    osympp[symcount + added_symbol_cnt] = NULL;

    bfd_set_symtab (obfd, osympp, symcount + added_symbol_cnt);
    
    /* now that we've set the relocs and cleaned the symtab, can call this */
    bfd_map_over_sections (ibfd, copy_section_data, obfd);

    bfd_close(obfd);
    bfd_close(ibfd);

    return 0;

}