Add support for PEF, Mach-O, xSYM

1 files changed, 2163 insertions, 0 deletions

diff --git a/bfd/mach-o.c b/bfd/mach-o.c
new file mode 100644
index 0000000..6243220
--- /dev/null
+++ b/bfd/mach-o.c
@@ -0,0 +1,2163 @@
+/* Mach-O support for BFD.
+   Copyright 1999, 2000, 2001, 2002
+   Free Software Foundation, Inc.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software 
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "mach-o.h"
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "libiberty.h"
+#include <ctype.h>
+
+#ifndef BFD_IO_FUNCS
+#define BFD_IO_FUNCS 0
+#endif
+
+#define bfd_mach_o_mkarchive _bfd_noarchive_mkarchive
+#define bfd_mach_o_read_ar_hdr _bfd_noarchive_read_ar_hdr
+#define bfd_mach_o_slurp_armap _bfd_noarchive_slurp_armap
+#define bfd_mach_o_slurp_extended_name_table _bfd_noarchive_slurp_extended_name_table
+#define bfd_mach_o_construct_extended_name_table _bfd_noarchive_construct_extended_name_table
+#define bfd_mach_o_truncate_arname _bfd_noarchive_truncate_arname
+#define bfd_mach_o_write_armap _bfd_noarchive_write_armap
+#define bfd_mach_o_get_elt_at_index _bfd_noarchive_get_elt_at_index
+#define bfd_mach_o_generic_stat_arch_elt _bfd_noarchive_generic_stat_arch_elt
+#define bfd_mach_o_update_armap_timestamp _bfd_noarchive_update_armap_timestamp
+#define	bfd_mach_o_close_and_cleanup _bfd_generic_close_and_cleanup
+#define bfd_mach_o_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
+#define bfd_mach_o_new_section_hook _bfd_generic_new_section_hook
+#define bfd_mach_o_get_section_contents_in_window _bfd_generic_get_section_contents_in_window
+#define bfd_mach_o_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
+#define bfd_mach_o_get_lineno _bfd_nosymbols_get_lineno
+#define bfd_mach_o_find_nearest_line _bfd_nosymbols_find_nearest_line
+#define bfd_mach_o_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
+#define bfd_mach_o_read_minisymbols _bfd_generic_read_minisymbols
+#define bfd_mach_o_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
+#define bfd_mach_o_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
+#define bfd_mach_o_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
+#define bfd_mach_o_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
+#define bfd_mach_o_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
+#define bfd_mach_o_bfd_relax_section bfd_generic_relax_section
+#define bfd_mach_o_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
+#define bfd_mach_o_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
+#define bfd_mach_o_bfd_link_add_symbols _bfd_generic_link_add_symbols
+#define bfd_mach_o_bfd_link_just_syms _bfd_generic_link_just_syms
+#define bfd_mach_o_bfd_final_link _bfd_generic_final_link
+#define bfd_mach_o_bfd_link_split_section _bfd_generic_link_split_section
+#define bfd_mach_o_set_arch_mach bfd_default_set_arch_mach
+#define bfd_mach_o_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
+#define bfd_mach_o_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
+#define bfd_mach_o_bfd_print_private_bfd_data _bfd_generic_bfd_print_private_bfd_data
+#define bfd_mach_o_get_section_contents _bfd_generic_get_section_contents
+#define bfd_mach_o_set_section_contents _bfd_generic_set_section_contents
+#define bfd_mach_o_bfd_gc_sections bfd_generic_gc_sections
+#define bfd_mach_o_bfd_merge_sections bfd_generic_merge_sections
+#define bfd_mach_o_bfd_discard_group bfd_generic_discard_group
+
+static boolean  bfd_mach_o_bfd_copy_private_symbol_data  PARAMS ((bfd *, asymbol *, bfd *, asymbol *));
+static boolean  bfd_mach_o_bfd_copy_private_section_data PARAMS ((bfd *, asection *, bfd *, asection *));
+static boolean  bfd_mach_o_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
+static long     bfd_mach_o_count_symbols             PARAMS ((bfd *));
+static long     bfd_mach_o_get_symtab_upper_bound    PARAMS ((bfd *));
+static long     bfd_mach_o_get_symtab                PARAMS ((bfd *, asymbol **));
+static void     bfd_mach_o_get_symbol_info           PARAMS ((bfd *, asymbol *, symbol_info *));
+static void     bfd_mach_o_print_symbol              PARAMS ((bfd *, PTR, asymbol *, bfd_print_symbol_type));
+static void     bfd_mach_o_convert_architecture      PARAMS ((bfd_mach_o_cpu_type, bfd_mach_o_cpu_subtype, enum bfd_architecture *, unsigned long *));
+static boolean  bfd_mach_o_write_contents            PARAMS ((bfd *));
+static int      bfd_mach_o_sizeof_headers            PARAMS ((bfd *, boolean));
+static asymbol *   bfd_mach_o_make_empty_symbol      PARAMS ((bfd *));
+static int      bfd_mach_o_write_header              PARAMS ((bfd *, bfd_mach_o_header *));
+static int      bfd_mach_o_read_header               PARAMS ((bfd *, bfd_mach_o_header *));
+static asection *  bfd_mach_o_make_bfd_section       PARAMS ((bfd *, bfd_mach_o_section *));
+static int      bfd_mach_o_scan_read_section         PARAMS ((bfd *, bfd_mach_o_section *, bfd_vma));
+static int      bfd_mach_o_scan_write_section        PARAMS ((bfd *, bfd_mach_o_section *, bfd_vma));
+static int      bfd_mach_o_scan_write_symtab_symbols PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_write_thread         PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_dylinker        PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_dylib           PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_prebound_dylib  PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_thread          PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_write_symtab         PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_dysymtab        PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_symtab          PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_segment         PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_write_segment        PARAMS ((bfd *, bfd_mach_o_load_command *));
+static int      bfd_mach_o_scan_read_command         PARAMS ((bfd *, bfd_mach_o_load_command *));
+static void     bfd_mach_o_flatten_sections          PARAMS ((bfd *));
+static const char * bfd_mach_o_i386_flavour_string   PARAMS ((unsigned int));
+static const char * bfd_mach_o_ppc_flavour_string    PARAMS ((unsigned int));
+
+/* The flags field of a section structure is separated into two parts a section
+   type and section attributes.  The section types are mutually exclusive (it
+   can only have one type) but the section attributes are not (it may have more
+   than one attribute).  */
+
+#define SECTION_TYPE             0x000000ff     /* 256 section types.  */
+#define SECTION_ATTRIBUTES       0xffffff00     /*  24 section attributes.  */
+
+/* Constants for the section attributes part of the flags field of a section
+   structure.  */
+
+#define SECTION_ATTRIBUTES_USR   0xff000000     /* User-settable attributes.  */
+#define S_ATTR_PURE_INSTRUCTIONS 0x80000000     /* Section contains only true machine instructions.  */
+#define SECTION_ATTRIBUTES_SYS   0x00ffff00     /* System setable attributes.  */
+#define S_ATTR_SOME_INSTRUCTIONS 0x00000400     /* Section contains some machine instructions.  */
+#define S_ATTR_EXT_RELOC         0x00000200     /* Section has external relocation entries.  */
+#define S_ATTR_LOC_RELOC         0x00000100     /* Section has local relocation entries.  */
+
+#define N_STAB 0xe0
+#define N_TYPE 0x1e
+#define N_EXT  0x01
+#define N_UNDF 0x0
+#define N_ABS  0x2
+#define N_SECT 0xe
+#define N_INDR 0xa
+
+boolean
+bfd_mach_o_valid (abfd)
+     bfd *abfd;
+{
+  if (abfd == NULL || abfd->xvec == NULL)
+    return 0;
+
+  if (! ((abfd->xvec == &mach_o_be_vec)
+	 || (abfd->xvec == &mach_o_le_vec)
+	 || (abfd->xvec == &mach_o_fat_vec)))
+    return 0;
+
+  if (abfd->tdata.mach_o_data == NULL)
+    return 0;
+  return 1;
+}
+
+/* Copy any private info we understand from the input symbol
+   to the output symbol.  */
+
+static boolean
+bfd_mach_o_bfd_copy_private_symbol_data (ibfd, isymbol, obfd, osymbol)
+     bfd *ibfd ATTRIBUTE_UNUSED;
+     asymbol *isymbol ATTRIBUTE_UNUSED;
+     bfd *obfd ATTRIBUTE_UNUSED;
+     asymbol *osymbol ATTRIBUTE_UNUSED;
+{
+  return true;
+}
+
+/* Copy any private info we understand from the input section
+   to the output section.  */
+
+static boolean
+bfd_mach_o_bfd_copy_private_section_data (ibfd, isection, obfd, osection)
+     bfd *ibfd ATTRIBUTE_UNUSED;
+     asection *isection ATTRIBUTE_UNUSED;
+     bfd *obfd ATTRIBUTE_UNUSED;
+     asection *osection ATTRIBUTE_UNUSED;
+{
+  return true;
+}
+
+/* Copy any private info we understand from the input bfd
+   to the output bfd.  */
+
+static boolean
+bfd_mach_o_bfd_copy_private_bfd_data (ibfd, obfd)
+     bfd *ibfd;
+     bfd *obfd;
+{
+  BFD_ASSERT (bfd_mach_o_valid (ibfd));
+  BFD_ASSERT (bfd_mach_o_valid (obfd));
+
+  obfd->tdata.mach_o_data = ibfd->tdata.mach_o_data;
+  obfd->tdata.mach_o_data->ibfd = ibfd;
+  return true;
+}
+
+static long
+bfd_mach_o_count_symbols (abfd)
+     bfd *abfd;
+{
+  bfd_mach_o_data_struct *mdata = NULL;
+  long nsyms = 0;
+  unsigned long i;
+  
+  BFD_ASSERT (bfd_mach_o_valid (abfd));
+  mdata = abfd->tdata.mach_o_data;
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    if (mdata->commands[i].type == BFD_MACH_O_LC_SYMTAB)
+      {
+	bfd_mach_o_symtab_command *sym = &mdata->commands[i].command.symtab;
+	nsyms += sym->nsyms;
+      }
+
+  return nsyms;
+}
+
+static long
+bfd_mach_o_get_symtab_upper_bound (abfd)
+     bfd *abfd;
+{
+  long nsyms = bfd_mach_o_count_symbols (abfd);
+
+  if (nsyms < 0)
+    return nsyms;
+
+  return ((nsyms + 1) * sizeof (asymbol *));
+}
+
+static long
+bfd_mach_o_get_symtab (abfd, alocation)
+     bfd *abfd;
+     asymbol **alocation;
+{
+  bfd_mach_o_data_struct *mdata = abfd->tdata.mach_o_data;
+  long nsyms = bfd_mach_o_count_symbols (abfd);
+  asymbol **csym = alocation;
+  unsigned long i, j;
+
+  if (nsyms < 0)
+    return nsyms;
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      if (mdata->commands[i].type == BFD_MACH_O_LC_SYMTAB)
+	{
+	  bfd_mach_o_symtab_command *sym = &mdata->commands[i].command.symtab;
+
+	  if (bfd_mach_o_scan_read_symtab_symbols (abfd, &mdata->commands[i].command.symtab) != 0)
+	    {
+	      fprintf (stderr, "bfd_mach_o_get_symtab: unable to load symbols for section %lu\n", i);
+	      return 0;
+	    }
+
+	  BFD_ASSERT (sym->symbols != NULL);
+
+	  for (j = 0; j < sym->nsyms; j++)
+	    {
+	      BFD_ASSERT (csym < (alocation + nsyms));
+	      *csym++ = &sym->symbols[j];
+	    }
+	}
+    }
+
+  *csym++ = NULL;
+  
+  return nsyms;
+}
+
+static void
+bfd_mach_o_get_symbol_info (abfd, symbol, ret)
+     bfd *abfd ATTRIBUTE_UNUSED;
+     asymbol *symbol;
+     symbol_info *ret;
+{
+  bfd_symbol_info (symbol, ret);
+}
+
+static void
+bfd_mach_o_print_symbol (abfd, afile, symbol, how)
+     bfd *abfd;
+     PTR afile;
+     asymbol *symbol;
+     bfd_print_symbol_type how;
+{
+  FILE *file = (FILE *) afile;
+
+  switch (how)
+    {
+    case bfd_print_symbol_name:
+      fprintf (file, "%s", symbol->name);
+      break;
+    default:
+      bfd_print_symbol_vandf (abfd, (PTR) file, symbol);
+      fprintf (file, " %-5s %s", symbol->section->name, symbol->name);
+    }
+}
+
+static void
+bfd_mach_o_convert_architecture (mtype, msubtype, type, subtype)
+     bfd_mach_o_cpu_type mtype;
+     bfd_mach_o_cpu_subtype msubtype ATTRIBUTE_UNUSED;
+     enum bfd_architecture *type;
+     unsigned long *subtype;
+{
+  *subtype = bfd_arch_unknown;
+
+  switch (mtype)
+    {
+    case BFD_MACH_O_CPU_TYPE_VAX: *type = bfd_arch_vax; break;
+    case BFD_MACH_O_CPU_TYPE_MC680x0: *type = bfd_arch_m68k; break;
+    case BFD_MACH_O_CPU_TYPE_I386: *type = bfd_arch_i386; break;
+    case BFD_MACH_O_CPU_TYPE_MIPS: *type = bfd_arch_mips; break;
+    case BFD_MACH_O_CPU_TYPE_MC98000: *type = bfd_arch_m98k; break;
+    case BFD_MACH_O_CPU_TYPE_HPPA: *type = bfd_arch_hppa; break;
+    case BFD_MACH_O_CPU_TYPE_ARM: *type = bfd_arch_arm; break;
+    case BFD_MACH_O_CPU_TYPE_MC88000: *type = bfd_arch_m88k; break;
+    case BFD_MACH_O_CPU_TYPE_SPARC: *type = bfd_arch_sparc; break;
+    case BFD_MACH_O_CPU_TYPE_I860: *type = bfd_arch_i860; break;
+    case BFD_MACH_O_CPU_TYPE_ALPHA: *type = bfd_arch_alpha; break;
+    case BFD_MACH_O_CPU_TYPE_POWERPC: *type = bfd_arch_powerpc; break;
+    default: *type = bfd_arch_unknown; break;
+    }
+
+  switch (*type)
+    {
+    case bfd_arch_i386: *subtype = bfd_mach_i386_i386; break;
+    case bfd_arch_sparc: *subtype = bfd_mach_sparc; break;
+    default:
+      *subtype = bfd_arch_unknown;
+    }
+}
+  
+static boolean
+bfd_mach_o_write_contents (abfd)
+     bfd *abfd;
+{
+  unsigned int i;
+  asection *s;
+
+  bfd_mach_o_data_struct *mdata = abfd->tdata.mach_o_data;
+
+  /* Write data sections first in case they overlap header data to be
+     written later.  */
+
+  for (s = abfd->sections; s != (asection *) NULL; s = s->next)
+    ;
+
+#if 0
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      bfd_mach_o_load_command *cur = &mdata->commands[i];
+      if (cur->type != BFD_MACH_O_LC_SEGMENT)
+	break;
+
+      {
+	bfd_mach_o_segment_command *seg = &cur->command.segment;
+	char buf[1024];
+	bfd_vma nbytes = seg->filesize;
+	bfd_vma curoff = seg->fileoff;
+
+	while (nbytes > 0)
+	  {
+	    bfd_vma thisread = nbytes;
+
+	    if (thisread > 1024)
+	      thisread = 1024;
+
+	    bfd_seek (abfd, curoff, SEEK_SET);
+	    if (bfd_bread ((PTR) buf, thisread, abfd) != thisread)
+	      return false;
+
+	    bfd_seek (abfd, curoff, SEEK_SET);
+	    if (bfd_bwrite ((PTR) buf, thisread, abfd) != thisread)
+	      return false;
+
+	    nbytes -= thisread;
+	    curoff += thisread;
+	  }
+      }
+  }
+#endif
+
+  /* Now write header information.  */
+  if (bfd_mach_o_write_header (abfd, &mdata->header) != 0)
+    return false;
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      unsigned char buf[8];
+      bfd_mach_o_load_command *cur = &mdata->commands[i];
+      unsigned long typeflag;
+
+      typeflag = cur->type_required ? cur->type & BFD_MACH_O_LC_REQ_DYLD : cur->type;
+
+      bfd_h_put_32 (abfd, typeflag, buf);
+      bfd_h_put_32 (abfd, cur->len, buf + 4);
+
+      bfd_seek (abfd, cur->offset, SEEK_SET);
+      if (bfd_bwrite ((PTR) buf, 8, abfd) != 8)
+	return false;
+
+      switch (cur->type)
+	{
+	case BFD_MACH_O_LC_SEGMENT:
+	  if (bfd_mach_o_scan_write_segment (abfd, cur) != 0)
+	    return false;
+	  break;
+	case BFD_MACH_O_LC_SYMTAB:
+	  if (bfd_mach_o_scan_write_symtab (abfd, cur) != 0)
+	    return false;
+	  break;
+	case BFD_MACH_O_LC_SYMSEG:
+	  break;
+	case BFD_MACH_O_LC_THREAD:
+	case BFD_MACH_O_LC_UNIXTHREAD:
+	  if (bfd_mach_o_scan_write_thread (abfd, cur) != 0)
+	    return false;
+	  break;
+	case BFD_MACH_O_LC_LOADFVMLIB:
+	case BFD_MACH_O_LC_IDFVMLIB:
+	case BFD_MACH_O_LC_IDENT:
+	case BFD_MACH_O_LC_FVMFILE:
+	case BFD_MACH_O_LC_PREPAGE:
+	case BFD_MACH_O_LC_DYSYMTAB:
+	case BFD_MACH_O_LC_LOAD_DYLIB:
+	case BFD_MACH_O_LC_LOAD_WEAK_DYLIB:
+	case BFD_MACH_O_LC_ID_DYLIB:
+	case BFD_MACH_O_LC_LOAD_DYLINKER:
+	case BFD_MACH_O_LC_ID_DYLINKER:
+	case BFD_MACH_O_LC_PREBOUND_DYLIB:
+	case BFD_MACH_O_LC_ROUTINES:
+	case BFD_MACH_O_LC_SUB_FRAMEWORK:
+	  break;
+	default:
+	  fprintf (stderr,
+		   "unable to write unknown load command 0x%lx\n",
+		   (long) cur->type);
+	  return false;
+	}
+    }
+
+  return true;
+}
+
+static int
+bfd_mach_o_sizeof_headers (a, b)
+     bfd *a ATTRIBUTE_UNUSED;
+     boolean b ATTRIBUTE_UNUSED;
+{
+  return 0;
+}
+
+/* Make an empty symbol.  This is required only because
+   bfd_make_section_anyway wants to create a symbol for the section.  */
+
+static asymbol *
+bfd_mach_o_make_empty_symbol (abfd)
+     bfd *abfd;
+{
+  asymbol *new;
+
+  new = (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
+  if (new == NULL)
+    return new;
+  new->the_bfd = abfd;
+  return new;
+}
+
+static int
+bfd_mach_o_write_header (abfd, header)
+     bfd *abfd;
+     bfd_mach_o_header *header;
+{
+  unsigned char buf[28];
+
+  bfd_h_put_32 (abfd, header->magic, buf + 0);
+  bfd_h_put_32 (abfd, header->cputype, buf + 4);
+  bfd_h_put_32 (abfd, header->cpusubtype, buf + 8);
+  bfd_h_put_32 (abfd, header->filetype, buf + 12);
+  bfd_h_put_32 (abfd, header->ncmds, buf + 16);
+  bfd_h_put_32 (abfd, header->sizeofcmds, buf + 20);
+  bfd_h_put_32 (abfd, header->flags, buf + 24);
+      
+  bfd_seek (abfd, 0, SEEK_SET);
+  if (bfd_bwrite ((PTR) buf, 28, abfd) != 28)
+    return -1;
+
+  return 0;
+}
+
+static int
+bfd_mach_o_read_header (abfd, header)
+     bfd *abfd;
+     bfd_mach_o_header *header;
+{
+  unsigned char buf[28];
+  bfd_vma (*get32) PARAMS ((const bfd_byte *)) = NULL;
+
+  bfd_seek (abfd, 0, SEEK_SET);
+
+  if (bfd_bread ((PTR) buf, 28, abfd) != 28)
+    return -1;
+
+  if (bfd_getb32 (buf) == 0xfeedface)
+    {
+      header->byteorder = BFD_ENDIAN_BIG;
+      header->magic = 0xfeedface;
+      get32 = bfd_getb32;
+    }
+  else if (bfd_getl32 (buf) == 0xfeedface)
+    {
+      header->byteorder = BFD_ENDIAN_LITTLE; 
+      header->magic = 0xfeedface;
+      get32 = bfd_getl32;
+    }
+  else
+    {
+      header->byteorder = BFD_ENDIAN_UNKNOWN;
+      return -1;
+    }
+      
+  header->cputype = (*get32) (buf + 4);
+  header->cpusubtype = (*get32) (buf + 8);
+  header->filetype = (*get32) (buf + 12);
+  header->ncmds = (*get32) (buf + 16);
+  header->sizeofcmds = (*get32) (buf + 20);
+  header->flags = (*get32) (buf + 24);
+
+  return 0;
+}
+
+static asection *
+bfd_mach_o_make_bfd_section (abfd, section)
+     bfd *abfd;
+     bfd_mach_o_section *section;
+{
+  asection *bfdsec;
+  char *sname;
+  const char *prefix = "LC_SEGMENT";
+  unsigned int snamelen;
+
+  snamelen = strlen (prefix) + 1
+    + strlen (section->segname) + 1
+    + strlen (section->sectname) + 1;
+
+  sname = (char *) bfd_alloc (abfd, snamelen);
+  if (sname == NULL)
+    return NULL;
+  sprintf (sname, "%s.%s.%s", prefix, section->segname, section->sectname);
+
+  bfdsec = bfd_make_section_anyway (abfd, sname);
+  if (bfdsec == NULL)
+    return NULL;
+  
+  bfdsec->vma = section->addr;
+  bfdsec->lma = section->addr;
+  bfdsec->_raw_size = section->size;
+  bfdsec->filepos = section->offset;
+  bfdsec->alignment_power = section->align;
+
+  if (section->flags & BFD_MACH_O_S_ZEROFILL)
+    bfdsec->flags = SEC_ALLOC;
+  else
+    bfdsec->flags = SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_CODE;
+
+  return bfdsec;
+}
+
+static int
+bfd_mach_o_scan_read_section (abfd, section, offset)
+     bfd *abfd;
+     bfd_mach_o_section *section;
+     bfd_vma offset;
+{
+  unsigned char buf[68];
+
+  bfd_seek (abfd, offset, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 68, abfd) != 68)
+    return -1;
+  
+  memcpy (section->sectname, buf, 16);
+  section->sectname[16] = '\0';
+  memcpy (section->segname, buf + 16, 16);
+  section->segname[16] = '\0';
+  section->addr = bfd_h_get_32 (abfd, buf + 32);
+  section->size = bfd_h_get_32 (abfd, buf + 36);
+  section->offset = bfd_h_get_32 (abfd, buf + 40);
+  section->align = bfd_h_get_32 (abfd, buf + 44);
+  section->reloff = bfd_h_get_32 (abfd, buf + 48);
+  section->nreloc = bfd_h_get_32 (abfd, buf + 52);
+  section->flags = bfd_h_get_32 (abfd, buf + 56);
+  section->reserved1 = bfd_h_get_32 (abfd, buf + 60);
+  section->reserved2 = bfd_h_get_32 (abfd, buf + 64);
+  section->bfdsection = bfd_mach_o_make_bfd_section (abfd, section);
+
+  if (section->bfdsection == NULL)
+    return -1;
+
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_write_section (abfd, section, offset)
+     bfd *abfd;
+     bfd_mach_o_section *section;
+     bfd_vma offset;
+{
+  unsigned char buf[68];
+
+  memcpy (buf, section->sectname, 16);
+  memcpy (buf + 16, section->segname, 16);
+  bfd_h_put_32 (abfd, section->addr, buf + 32);
+  bfd_h_put_32 (abfd, section->size, buf + 36);
+  bfd_h_put_32 (abfd, section->offset, buf + 40);
+  bfd_h_put_32 (abfd, section->align, buf + 44);
+  bfd_h_put_32 (abfd, section->reloff, buf + 48);
+  bfd_h_put_32 (abfd, section->nreloc, buf + 52);
+  bfd_h_put_32 (abfd, section->flags, buf + 56);
+  /* bfd_h_put_32 (abfd, section->reserved1, buf + 60); */
+  /* bfd_h_put_32 (abfd, section->reserved2, buf + 64); */
+
+  bfd_seek (abfd, offset, SEEK_SET);
+  if (bfd_bwrite ((PTR) buf, 68, abfd) != 68)
+    return -1;
+  
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_write_symtab_symbols (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_symtab_command *sym = &command->command.symtab;
+  asymbol *s = NULL;
+  unsigned long i;
+
+  for (i = 0; i < sym->nsyms; i++)
+    {
+      unsigned char buf[12];
+      bfd_vma symoff = sym->symoff + (i * 12);
+      unsigned char ntype = 0;
+      unsigned char nsect = 0;
+      short ndesc = 0;
+
+      s = &sym->symbols[i];
+
+      /* Don't set this from the symbol information; use stored values.  */
+#if 0 
+      if (s->flags & BSF_GLOBAL)
+	ntype |= N_EXT;
+      if (s->flags & BSF_DEBUGGING)
+	ntype |= N_STAB;
+
+      if (s->section == bfd_und_section_ptr)
+	ntype |= N_UNDF;
+      else if (s->section == bfd_abs_section_ptr)
+	ntype |= N_ABS;
+      else
+	ntype |= N_SECT;
+#endif
+      
+      /* Instead just set from the stored values.  */
+      ntype = (s->udata.i >> 24) & 0xff;
+      nsect = (s->udata.i >> 16) & 0xff;
+      ndesc = s->udata.i & 0xffff;
+
+      bfd_h_put_32 (abfd, s->name - sym->strtab, buf);
+      bfd_h_put_8 (abfd, ntype, buf + 4);
+      bfd_h_put_8 (abfd, nsect, buf + 5);
+      bfd_h_put_16 (abfd, ndesc, buf + 6);
+      bfd_h_put_32 (abfd, s->section->vma + s->value, buf + 8);
+
+      bfd_seek (abfd, symoff, SEEK_SET);
+      if (bfd_bwrite ((PTR) buf, 12, abfd) != 12)
+	{
+	  fprintf (stderr, "bfd_mach_o_scan_write_symtab_symbols: unable to write %d bytes at %lu\n", 
+		   12, (unsigned long) symoff);
+	  return -1; 
+	}
+    }
+
+  return 0;
+}
+
+int
+bfd_mach_o_scan_read_symtab_symbol (abfd, sym, s, i)
+     bfd *abfd;
+     bfd_mach_o_symtab_command *sym;
+     asymbol *s;
+     unsigned long i;
+{
+  bfd_mach_o_data_struct *mdata = abfd->tdata.mach_o_data;
+  bfd_vma symoff = sym->symoff + (i * 12);
+  unsigned char buf[12];
+  unsigned char type = -1;
+  unsigned char section = -1;
+  short desc = -1;
+  long value = -1;
+  unsigned long stroff = -1;
+  unsigned int symtype = -1;
+
+  BFD_ASSERT (sym->strtab != NULL);
+
+  bfd_seek (abfd, symoff, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 12, abfd) != 12)
+    {
+      fprintf (stderr, "bfd_mach_o_scan_read_symtab_symbol: unable to read %d bytes at %lu\n",
+	       12, (unsigned long) symoff);
+      return -1;
+    }
+
+  stroff = bfd_h_get_32 (abfd, buf);
+  type = bfd_h_get_8 (abfd, buf + 4);
+  symtype = (type & 0x0e);
+  section = bfd_h_get_8 (abfd, buf + 5) - 1;
+  desc = bfd_h_get_16 (abfd, buf + 6);
+  value = bfd_h_get_32 (abfd, buf + 8);
+
+  if (stroff >= sym->strsize)
+    {
+      fprintf (stderr, "bfd_mach_o_scan_read_symtab_symbol: symbol name out of range (%lu >= %lu)\n",
+	       (unsigned long) stroff, (unsigned long) sym->strsize);
+      return -1; 
+    }
+
+  s->the_bfd = abfd;
+  s->name = sym->strtab + stroff;
+  s->value = value;
+  s->udata.i = (type << 24) | (section << 16) | desc;
+  s->flags = 0x0;
+
+  if (type & BFD_MACH_O_N_STAB)
+    {
+      s->flags |= BSF_DEBUGGING;
+      s->section = bfd_und_section_ptr;
+    }
+  else
+    {
+      if (type & BFD_MACH_O_N_PEXT)
+	{
+	  type &= ~BFD_MACH_O_N_PEXT;
+	  s->flags |= BSF_GLOBAL;
+	}
+
+      if (type & BFD_MACH_O_N_EXT)
+	{
+	  type &= ~BFD_MACH_O_N_EXT;
+	  s->flags |= BSF_GLOBAL;
+	}
+
+      switch (symtype)
+	{
+	case BFD_MACH_O_N_UNDF:
+	  s->section = bfd_und_section_ptr;
+	  break;
+	case BFD_MACH_O_N_PBUD:
+	  s->section = bfd_und_section_ptr;
+	  break;
+	case BFD_MACH_O_N_ABS:
+	  s->section = bfd_abs_section_ptr;
+	  break;
+	case BFD_MACH_O_N_SECT:
+	  if ((section > 0) && (section <= mdata->nsects))
+	    {
+	      s->section = mdata->sections[section - 1]->bfdsection;
+	      s->value = s->value - mdata->sections[section - 1]->addr;
+	    }
+	  else
+	    {
+	      /* Mach-O uses 0 to mean "no section"; not an error.  */
+	      if (section != 0)
+		{
+		  fprintf (stderr, "bfd_mach_o_scan_read_symtab_symbol: "
+			   "symbol \"%s\" specified invalid section %d (max %lu): setting to undefined\n", 
+			   s->name, section, mdata->nsects);
+		}
+	      s->section = bfd_und_section_ptr;
+	    }
+	  break;
+	case BFD_MACH_O_N_INDR:
+	  fprintf (stderr, "bfd_mach_o_scan_read_symtab_symbol: "
+		   "symbol \"%s\" is unsupported 'indirect' reference: setting to undefined\n", 
+		   s->name);
+	  s->section = bfd_und_section_ptr;
+	  break;
+	default:
+	  fprintf (stderr, "bfd_mach_o_scan_read_symtab_symbol: "
+		   "symbol \"%s\" specified invalid type field 0x%x: setting to undefined\n", 
+		   s->name, symtype);
+	  s->section = bfd_und_section_ptr;
+	  break;
+	}
+    }
+
+  return 0;
+}
+
+int
+bfd_mach_o_scan_read_symtab_strtab (abfd, sym)
+     bfd *abfd;
+     bfd_mach_o_symtab_command *sym;
+{
+  BFD_ASSERT (sym->strtab == NULL);
+
+  if (abfd->flags & BFD_IN_MEMORY)
+    {
+      struct bfd_in_memory *b;
+
+      b = (struct bfd_in_memory *) abfd->iostream;
+
+      if ((sym->stroff + sym->strsize) > b->size)
+	{
+	  bfd_set_error (bfd_error_file_truncated);
+	  return -1;
+	}
+      sym->strtab = b->buffer + sym->stroff;
+      return 0;
+    }
+
+  sym->strtab = bfd_alloc (abfd, sym->strsize);
+  if (sym->strtab == NULL)
+    return -1;
+
+  bfd_seek (abfd, sym->stroff, SEEK_SET);
+  if (bfd_bread ((PTR) sym->strtab, sym->strsize, abfd) != sym->strsize)
+    {
+      fprintf (stderr, "bfd_mach_o_scan_read_symtab_strtab: unable to read %lu bytes at %lu\n",
+	       sym->strsize, sym->stroff);
+      return -1; 
+    }
+
+  return 0;
+}
+
+int 
+bfd_mach_o_scan_read_symtab_symbols (abfd, sym)
+     bfd *abfd;
+     bfd_mach_o_symtab_command *sym;
+{
+  unsigned long i;
+  int ret;
+
+  BFD_ASSERT (sym->symbols == NULL);
+  sym->symbols = bfd_alloc (abfd, sym->nsyms * sizeof (asymbol));
+
+  if (sym->symbols == NULL)
+    {
+      fprintf (stderr, "bfd_mach_o_scan_read_symtab_symbols: unable to allocate memory for symbols\n");
+      return -1; 
+    }
+  
+  ret = bfd_mach_o_scan_read_symtab_strtab (abfd, sym);
+  if (ret != 0)
+    return ret;
+
+  for (i = 0; i < sym->nsyms; i++)
+    {
+      ret = bfd_mach_o_scan_read_symtab_symbol (abfd, sym, &sym->symbols[i], i);
+      if (ret != 0)
+	return ret;
+    }
+  
+  return 0;
+}
+
+int
+bfd_mach_o_scan_read_dysymtab_symbol (abfd, dysym, sym, s, i)
+     bfd *abfd;
+     bfd_mach_o_dysymtab_command *dysym;
+     bfd_mach_o_symtab_command *sym;
+     asymbol *s;
+     unsigned long i;
+{
+  unsigned long isymoff = dysym->indirectsymoff + (i * 4);
+  unsigned long symindex;
+  unsigned char buf[4];
+
+  BFD_ASSERT (i < dysym->nindirectsyms);
+  
+  bfd_seek (abfd, isymoff, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 4, abfd) != 4)
+    {
+      fprintf (stderr, "bfd_mach_o_scan_read_dysymtab_symbol: unable to read %lu bytes at %lu\n",
+	       (unsigned long) 4, isymoff);
+      return -1;
+    }
+  symindex = bfd_h_get_32 (abfd, buf);
+  
+  return bfd_mach_o_scan_read_symtab_symbol (abfd, sym, s, symindex);
+}
+
+static const char *
+bfd_mach_o_i386_flavour_string (flavour)
+     unsigned int flavour;
+{
+  switch ((int) flavour)
+    {
+    case BFD_MACH_O_i386_NEW_THREAD_STATE: return "i386_NEW_THREAD_STATE";
+    case BFD_MACH_O_i386_FLOAT_STATE: return "i386_FLOAT_STATE";
+    case BFD_MACH_O_i386_ISA_PORT_MAP_STATE: return "i386_ISA_PORT_MAP_STATE";
+    case BFD_MACH_O_i386_V86_ASSIST_STATE: return "i386_V86_ASSIST_STATE";
+    case BFD_MACH_O_i386_REGS_SEGS_STATE: return "i386_REGS_SEGS_STATE";
+    case BFD_MACH_O_i386_THREAD_SYSCALL_STATE: return "i386_THREAD_SYSCALL_STATE";
+    case BFD_MACH_O_i386_THREAD_STATE_NONE: return "i386_THREAD_STATE_NONE";
+    case BFD_MACH_O_i386_SAVED_STATE: return "i386_SAVED_STATE";
+    case BFD_MACH_O_i386_THREAD_STATE: return "i386_THREAD_STATE";
+    case BFD_MACH_O_i386_THREAD_FPSTATE: return "i386_THREAD_FPSTATE";
+    case BFD_MACH_O_i386_THREAD_EXCEPTSTATE: return "i386_THREAD_EXCEPTSTATE";
+    case BFD_MACH_O_i386_THREAD_CTHREADSTATE: return "i386_THREAD_CTHREADSTATE";
+    default: return "UNKNOWN";
+    }
+}
+
+static const char *
+bfd_mach_o_ppc_flavour_string (flavour)
+     unsigned int flavour;
+{
+  switch ((int) flavour)
+    {
+    case BFD_MACH_O_PPC_THREAD_STATE: return "PPC_THREAD_STATE";
+    case BFD_MACH_O_PPC_FLOAT_STATE: return "PPC_FLOAT_STATE";
+    case BFD_MACH_O_PPC_EXCEPTION_STATE: return "PPC_EXCEPTION_STATE";
+    case BFD_MACH_O_PPC_VECTOR_STATE: return "PPC_VECTOR_STATE";
+    default: return "UNKNOWN";
+    }
+}
+
+static int
+bfd_mach_o_scan_write_thread (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_thread_command *cmd = &command->command.thread;
+  unsigned int i;
+  unsigned char buf[8];
+  bfd_vma offset;
+  unsigned int nflavours;
+
+  BFD_ASSERT ((command->type == BFD_MACH_O_LC_THREAD)
+	      || (command->type == BFD_MACH_O_LC_UNIXTHREAD));
+
+  offset = 8;
+  nflavours = 0;
+  for (i = 0; i < cmd->nflavours; i++)
+    {
+      BFD_ASSERT ((cmd->flavours[i].size % 4) == 0);
+      BFD_ASSERT (cmd->flavours[i].offset == (command->offset + offset + 8));
+
+      bfd_h_put_32 (abfd, cmd->flavours[i].flavour, buf);
+      bfd_h_put_32 (abfd, (cmd->flavours[i].size / 4), buf + 4);
+
+      bfd_seek (abfd, command->offset + offset, SEEK_SET);
+      if (bfd_bwrite ((PTR) buf, 8, abfd) != 8)
+	return -1;
+
+      offset += cmd->flavours[i].size + 8;
+    }
+
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_read_dylinker (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_dylinker_command *cmd = &command->command.dylinker;
+  unsigned char buf[4];
+  unsigned int nameoff;
+  asection *bfdsec;
+  char *sname;
+  const char *prefix;
+
+  BFD_ASSERT ((command->type == BFD_MACH_O_LC_ID_DYLINKER)
+	      || (command->type == BFD_MACH_O_LC_LOAD_DYLINKER));
+
+  bfd_seek (abfd, command->offset + 8, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 4, abfd) != 4)
+    return -1;
+
+  nameoff = bfd_h_get_32 (abfd, buf + 0);
+
+  cmd->name_offset = command->offset + nameoff;
+  cmd->name_len = command->len - nameoff;
+
+  if (command->type == BFD_MACH_O_LC_LOAD_DYLINKER)
+    prefix = "LC_LOAD_DYLINKER";
+  else if (command->type == BFD_MACH_O_LC_ID_DYLINKER)
+    prefix = "LC_ID_DYLINKER";
+  else
+    abort ();
+
+  sname = (char *) bfd_alloc (abfd, strlen (prefix) + 1);
+  if (sname == NULL)
+    return -1;
+  strcpy (sname, prefix);
+
+  bfdsec = bfd_make_section_anyway (abfd, sname);
+  if (bfdsec == NULL)
+    return -1;
+  
+  bfdsec->vma = 0;
+  bfdsec->lma = 0;
+  bfdsec->_raw_size = command->len - 8;
+  bfdsec->filepos = command->offset + 8;
+  bfdsec->alignment_power = 0;
+  bfdsec->flags = SEC_HAS_CONTENTS;
+
+  cmd->section = bfdsec;
+
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_read_dylib (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_dylib_command *cmd = &command->command.dylib;
+  unsigned char buf[16];
+  unsigned int nameoff;
+  asection *bfdsec;
+  char *sname;
+  const char *prefix;
+
+  BFD_ASSERT ((command->type == BFD_MACH_O_LC_ID_DYLIB)
+	      || (command->type == BFD_MACH_O_LC_LOAD_DYLIB)
+	      || (command->type == BFD_MACH_O_LC_LOAD_WEAK_DYLIB));
+
+  bfd_seek (abfd, command->offset + 8, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 16, abfd) != 16)
+    return -1;
+
+  nameoff = bfd_h_get_32 (abfd, buf + 0);
+  cmd->timestamp = bfd_h_get_32 (abfd, buf + 4);
+  cmd->current_version = bfd_h_get_32 (abfd, buf + 8);
+  cmd->compatibility_version = bfd_h_get_32 (abfd, buf + 12);
+
+  cmd->name_offset = command->offset + nameoff;
+  cmd->name_len = command->len - nameoff;
+
+  if (command->type == BFD_MACH_O_LC_LOAD_DYLIB)
+    prefix = "LC_LOAD_DYLIB";
+  else if (command->type == BFD_MACH_O_LC_LOAD_WEAK_DYLIB)
+    prefix = "LC_LOAD_WEAK_DYLIB";
+  else if (command->type == BFD_MACH_O_LC_ID_DYLIB)
+    prefix = "LC_ID_DYLIB";
+  else
+    abort ();
+
+  sname = (char *) bfd_alloc (abfd, strlen (prefix) + 1);
+  if (sname == NULL)
+    return -1;
+  strcpy (sname, prefix);
+
+  bfdsec = bfd_make_section_anyway (abfd, sname);
+  if (bfdsec == NULL)
+    return -1;
+  
+  bfdsec->vma = 0;
+  bfdsec->lma = 0;
+  bfdsec->_raw_size = command->len - 8;
+  bfdsec->filepos = command->offset + 8;
+  bfdsec->alignment_power = 0;
+  bfdsec->flags = SEC_HAS_CONTENTS;
+
+  cmd->section = bfdsec;
+
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_read_prebound_dylib (abfd, command)
+     bfd *abfd ATTRIBUTE_UNUSED;
+     bfd_mach_o_load_command *command ATTRIBUTE_UNUSED;
+{
+  /* bfd_mach_o_prebound_dylib_command *cmd = &command->command.prebound_dylib; */
+
+  BFD_ASSERT (command->type == BFD_MACH_O_LC_PREBOUND_DYLIB);
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_read_thread (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_data_struct *mdata = NULL;
+  bfd_mach_o_thread_command *cmd = &command->command.thread;
+  unsigned char buf[8];
+  bfd_vma offset;
+  unsigned int nflavours;
+  unsigned int i;
+
+  BFD_ASSERT ((command->type == BFD_MACH_O_LC_THREAD)
+	      || (command->type == BFD_MACH_O_LC_UNIXTHREAD));
+
+  BFD_ASSERT (bfd_mach_o_valid (abfd));
+  mdata = abfd->tdata.mach_o_data;
+  
+  offset = 8;
+  nflavours = 0;
+  while (offset != command->len)
+    {
+      if (offset >= command->len)
+	return -1;
+
+      bfd_seek (abfd, command->offset + offset, SEEK_SET);
+
+      if (bfd_bread ((PTR) buf, 8, abfd) != 8)
+	return -1;
+
+      offset += 8 + bfd_h_get_32 (abfd, buf + 4) * 4;
+      nflavours++;
+    }
+
+  cmd->flavours =
+    ((bfd_mach_o_thread_flavour *)
+     bfd_alloc (abfd, nflavours * sizeof (bfd_mach_o_thread_flavour)));
+  if (cmd->flavours == NULL)
+    return -1;
+  cmd->nflavours = nflavours;
+
+  offset = 8;
+  nflavours = 0;
+  while (offset != command->len)
+    {
+      if (offset >= command->len)
+	return -1;
+
+      if (nflavours >= cmd->nflavours)
+	return -1;
+
+      bfd_seek (abfd, command->offset + offset, SEEK_SET);
+
+      if (bfd_bread ((PTR) buf, 8, abfd) != 8)
+	return -1;
+
+      cmd->flavours[nflavours].flavour = bfd_h_get_32 (abfd, buf);
+      cmd->flavours[nflavours].offset = command->offset + offset + 8;
+      cmd->flavours[nflavours].size = bfd_h_get_32 (abfd, buf + 4) * 4;
+      offset += cmd->flavours[nflavours].size + 8;
+      nflavours++;
+    }
+
+  for (i = 0; i < nflavours; i++)
+    {
+      asection *bfdsec;
+      unsigned int snamelen;
+      char *sname;
+      const char *flavourstr;
+      const char *prefix = "LC_THREAD";
+      unsigned int i = 0;
+    
+      switch (mdata->header.cputype)
+	{
+	case BFD_MACH_O_CPU_TYPE_POWERPC:
+	  flavourstr = bfd_mach_o_ppc_flavour_string (cmd->flavours[i].flavour);
+	  break;
+	case BFD_MACH_O_CPU_TYPE_I386:
+	  flavourstr = bfd_mach_o_i386_flavour_string (cmd->flavours[i].flavour);
+	  break;
+	default:
+	  flavourstr = "UNKNOWN_ARCHITECTURE";
+	  break;
+	}
+    
+      snamelen = strlen (prefix) + 1 + 20 + 1 + strlen (flavourstr) + 1;
+      sname = (char *) bfd_alloc (abfd, snamelen);
+      if (sname == NULL)
+	return -1;
+
+      for (;;)
+	{
+	  sprintf (sname, "%s.%s.%u", prefix, flavourstr, i);
+	  if (bfd_get_section_by_name (abfd, sname) == NULL) {
+	    break;
+	  }
+	  i++;
+	}
+
+      bfdsec = bfd_make_section (abfd, sname);
+  
+      bfdsec->vma = 0;
+      bfdsec->lma = 0;
+      bfdsec->_raw_size = cmd->flavours[i].size;
+      bfdsec->filepos = cmd->flavours[i].offset;
+      bfdsec->alignment_power = 0x0;
+      bfdsec->flags = SEC_HAS_CONTENTS;
+
+      cmd->section = bfdsec;
+    }
+
+  return 0;
+}
+
+static int 
+bfd_mach_o_scan_write_symtab (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_symtab_command *seg = &command->command.symtab;
+  unsigned char buf[16];
+
+  BFD_ASSERT (command->type == BFD_MACH_O_LC_SYMTAB);
+
+  bfd_h_put_32 (abfd, seg->symoff, buf);
+  bfd_h_put_32 (abfd, seg->nsyms, buf + 4);
+  bfd_h_put_32 (abfd, seg->stroff, buf + 8);
+  bfd_h_put_32 (abfd, seg->strsize, buf + 12);
+
+  bfd_seek (abfd, command->offset + 8, SEEK_SET);
+  if (bfd_bwrite ((PTR) buf, 16, abfd) != 16)
+    return -1;
+  
+  if (bfd_mach_o_scan_write_symtab_symbols (abfd, command) != 0)
+    return -1;
+
+  return 0;
+}
+
+static int 
+bfd_mach_o_scan_read_dysymtab (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_dysymtab_command *seg = &command->command.dysymtab;
+  unsigned char buf[72];
+
+  BFD_ASSERT (command->type == BFD_MACH_O_LC_DYSYMTAB);
+
+  bfd_seek (abfd, command->offset + 8, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 72, abfd) != 72)
+    return -1;
+
+  seg->ilocalsym = bfd_h_get_32 (abfd, buf + 0);
+  seg->nlocalsym = bfd_h_get_32 (abfd, buf + 4);
+  seg->iextdefsym = bfd_h_get_32 (abfd, buf + 8);
+  seg->nextdefsym = bfd_h_get_32 (abfd, buf + 12);
+  seg->iundefsym = bfd_h_get_32 (abfd, buf + 16);
+  seg->nundefsym = bfd_h_get_32 (abfd, buf + 20);
+  seg->tocoff = bfd_h_get_32 (abfd, buf + 24);
+  seg->ntoc = bfd_h_get_32 (abfd, buf + 28);
+  seg->modtaboff = bfd_h_get_32 (abfd, buf + 32);
+  seg->nmodtab = bfd_h_get_32 (abfd, buf + 36);
+  seg->extrefsymoff = bfd_h_get_32 (abfd, buf + 40);
+  seg->nextrefsyms = bfd_h_get_32 (abfd, buf + 44);
+  seg->indirectsymoff = bfd_h_get_32 (abfd, buf + 48);
+  seg->nindirectsyms = bfd_h_get_32 (abfd, buf + 52);
+  seg->extreloff = bfd_h_get_32 (abfd, buf + 56);
+  seg->nextrel = bfd_h_get_32 (abfd, buf + 60);
+  seg->locreloff = bfd_h_get_32 (abfd, buf + 64);
+  seg->nlocrel = bfd_h_get_32 (abfd, buf + 68);
+
+  return 0;
+}
+
+static int 
+bfd_mach_o_scan_read_symtab (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  bfd_mach_o_symtab_command *seg = &command->command.symtab;
+  unsigned char buf[16];
+  asection *bfdsec;
+  char *sname;
+  const char *prefix = "LC_SYMTAB.stabs";
+
+  BFD_ASSERT (command->type == BFD_MACH_O_LC_SYMTAB);
+
+  bfd_seek (abfd, command->offset + 8, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 16, abfd) != 16)
+    return -1;
+  
+  seg->symoff = bfd_h_get_32 (abfd, buf);
+  seg->nsyms = bfd_h_get_32 (abfd, buf + 4);
+  seg->stroff = bfd_h_get_32 (abfd, buf + 8);
+  seg->strsize = bfd_h_get_32 (abfd, buf + 12);
+  seg->symbols = NULL;
+  seg->strtab = NULL;
+
+  sname = (char *) bfd_alloc (abfd, strlen (prefix) + 1);
+  if (sname == NULL)
+    return -1;
+  strcpy (sname, prefix);
+
+  bfdsec = bfd_make_section_anyway (abfd, sname);
+  if (bfdsec == NULL)
+    return -1;
+  
+  bfdsec->vma = 0;
+  bfdsec->lma = 0;
+  bfdsec->_raw_size = seg->nsyms * 12;
+  bfdsec->filepos = seg->symoff;
+  bfdsec->alignment_power = 0;
+  bfdsec->flags = SEC_HAS_CONTENTS;
+
+  seg->stabs_segment = bfdsec;
+
+  prefix = "LC_SYMTAB.stabstr";
+  sname = (char *) bfd_alloc (abfd, strlen (prefix) + 1);
+  if (sname == NULL)
+    return -1;
+  strcpy (sname, prefix);
+
+  bfdsec = bfd_make_section_anyway (abfd, sname);
+  if (bfdsec == NULL)
+    return -1;
+  
+  bfdsec->vma = 0;
+  bfdsec->lma = 0;
+  bfdsec->_raw_size = seg->strsize;
+  bfdsec->filepos = seg->stroff;
+  bfdsec->alignment_power = 0;
+  bfdsec->flags = SEC_HAS_CONTENTS;
+
+  seg->stabstr_segment = bfdsec;
+
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_read_segment (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  unsigned char buf[48];
+  bfd_mach_o_segment_command *seg = &command->command.segment;
+  unsigned long i;
+  asection *bfdsec;
+  char *sname;
+  const char *prefix = "LC_SEGMENT";
+  unsigned int snamelen;
+ 
+  BFD_ASSERT (command->type == BFD_MACH_O_LC_SEGMENT);
+
+  bfd_seek (abfd, command->offset + 8, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 48, abfd) != 48)
+    return -1;
+
+  memcpy (seg->segname, buf, 16);
+  seg->vmaddr = bfd_h_get_32 (abfd, buf + 16);
+  seg->vmsize = bfd_h_get_32 (abfd, buf + 20);
+  seg->fileoff = bfd_h_get_32 (abfd, buf + 24);
+  seg->filesize = bfd_h_get_32 (abfd, buf +  28);
+  /* seg->maxprot = bfd_h_get_32 (abfd, buf + 32); */
+  /* seg->initprot = bfd_h_get_32 (abfd, buf + 36); */
+  seg->nsects = bfd_h_get_32 (abfd, buf + 40);
+  seg->flags = bfd_h_get_32 (abfd, buf + 44);
+
+  snamelen = strlen (prefix) + 1 + strlen (seg->segname) + 1;
+  sname = (char *) bfd_alloc (abfd, snamelen);
+  if (sname == NULL)
+    return -1;
+  sprintf (sname, "%s.%s", prefix, seg->segname);
+
+  bfdsec = bfd_make_section_anyway (abfd, sname);
+  if (bfdsec == NULL)
+    return -1;
+
+  bfdsec->vma = seg->vmaddr;
+  bfdsec->lma = seg->vmaddr;
+  bfdsec->_raw_size = seg->filesize;
+  bfdsec->filepos = seg->fileoff;
+  bfdsec->alignment_power = 0x0;
+  bfdsec->flags = SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_CODE;
+
+  seg->segment = bfdsec;
+
+  if (seg->nsects != 0)
+    {
+      seg->sections = 
+	((bfd_mach_o_section *)
+	 bfd_alloc (abfd, seg->nsects * sizeof (bfd_mach_o_section)));
+      if (seg->sections == NULL)
+	return -1;
+    
+      for (i = 0; i < seg->nsects; i++)
+	{
+	  bfd_vma segoff = command->offset + 48 + 8 + (i * 68);
+
+	  if (bfd_mach_o_scan_read_section (abfd, &seg->sections[i], segoff) != 0)
+	    return -1;
+	}    
+    }
+
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_write_segment (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  unsigned char buf[48];
+  bfd_mach_o_segment_command *seg = &command->command.segment;
+  unsigned long i;
+  
+  BFD_ASSERT (command->type == BFD_MACH_O_LC_SEGMENT);
+
+  memcpy (buf, seg->segname, 16);
+  bfd_h_put_32 (abfd, seg->vmaddr, buf + 16);
+  bfd_h_put_32 (abfd, seg->vmsize, buf + 20);
+  bfd_h_put_32 (abfd, seg->fileoff, buf + 24);
+  bfd_h_put_32 (abfd, seg->filesize, buf + 28);
+  bfd_h_put_32 (abfd, 0 /* seg->maxprot */, buf + 32);
+  bfd_h_put_32 (abfd, 0 /* seg->initprot */, buf + 36);
+  bfd_h_put_32 (abfd, seg->nsects, buf + 40);
+  bfd_h_put_32 (abfd, seg->flags, buf + 44);
+
+  bfd_seek (abfd, command->offset + 8, SEEK_SET);
+  if (bfd_bwrite ((PTR) buf, 48, abfd) != 48)
+    return -1;
+
+  {
+    char buf[1024];
+    bfd_vma nbytes = seg->filesize;
+    bfd_vma curoff = seg->fileoff;
+    
+    while (nbytes > 0)
+      {
+	bfd_vma thisread = nbytes;
+
+	if (thisread > 1024)
+	  thisread = 1024;
+
+	bfd_seek (abfd, curoff, SEEK_SET);
+	if (bfd_bread ((PTR) buf, thisread, abfd) != thisread)
+	  return -1;
+
+	bfd_seek (abfd, curoff, SEEK_SET);
+	if (bfd_bwrite ((PTR) buf, thisread, abfd) != thisread)
+	  return -1;
+
+	nbytes -= thisread;
+	curoff += thisread;
+      }
+  }
+
+  for (i = 0; i < seg->nsects; i++)
+    {
+      bfd_vma segoff = command->offset + 48 + 8 + (i * 68);
+
+      if (bfd_mach_o_scan_write_section (abfd, &seg->sections[i], segoff) != 0)
+	return -1;
+    }
+
+  return 0;
+}
+
+static int
+bfd_mach_o_scan_read_command (abfd, command)
+     bfd *abfd;
+     bfd_mach_o_load_command *command;
+{
+  unsigned char buf[8];
+
+  bfd_seek (abfd, command->offset, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 8, abfd) != 8)
+    return -1;
+
+  command->type = (bfd_h_get_32 (abfd, buf) & ~BFD_MACH_O_LC_REQ_DYLD);
+  command->type_required = (bfd_h_get_32 (abfd, buf) & BFD_MACH_O_LC_REQ_DYLD) ? 1 : 0;
+  command->len = bfd_h_get_32 (abfd, buf + 4);
+
+  switch (command->type)
+    {
+    case BFD_MACH_O_LC_SEGMENT:
+      if (bfd_mach_o_scan_read_segment (abfd, command) != 0)
+	return -1;
+      break;
+    case BFD_MACH_O_LC_SYMTAB:
+      if (bfd_mach_o_scan_read_symtab (abfd, command) != 0)
+	return -1;
+      break;
+    case BFD_MACH_O_LC_SYMSEG:
+      break;
+    case BFD_MACH_O_LC_THREAD:
+    case BFD_MACH_O_LC_UNIXTHREAD:
+      if (bfd_mach_o_scan_read_thread (abfd, command) != 0)
+	return -1;
+      break;
+    case BFD_MACH_O_LC_LOAD_DYLINKER:
+    case BFD_MACH_O_LC_ID_DYLINKER:
+      if (bfd_mach_o_scan_read_dylinker (abfd, command) != 0)
+	return -1;
+      break;
+    case BFD_MACH_O_LC_LOAD_DYLIB:
+    case BFD_MACH_O_LC_ID_DYLIB:
+    case BFD_MACH_O_LC_LOAD_WEAK_DYLIB:
+      if (bfd_mach_o_scan_read_dylib (abfd, command) != 0)
+	return -1;
+      break;
+    case BFD_MACH_O_LC_PREBOUND_DYLIB:
+      if (bfd_mach_o_scan_read_prebound_dylib (abfd, command) != 0)
+	return -1;
+      break;
+    case BFD_MACH_O_LC_LOADFVMLIB:
+    case BFD_MACH_O_LC_IDFVMLIB:
+    case BFD_MACH_O_LC_IDENT:
+    case BFD_MACH_O_LC_FVMFILE:
+    case BFD_MACH_O_LC_PREPAGE:
+    case BFD_MACH_O_LC_ROUTINES:
+    case BFD_MACH_O_LC_SUB_FRAMEWORK:
+      break;
+    case BFD_MACH_O_LC_DYSYMTAB:
+      if (bfd_mach_o_scan_read_dysymtab (abfd, command) != 0)
+	return -1;
+      break;
+    case BFD_MACH_O_LC_SUB_UMBRELLA:
+    case BFD_MACH_O_LC_SUB_CLIENT:
+    case BFD_MACH_O_LC_SUB_LIBRARY:
+    case BFD_MACH_O_LC_TWOLEVEL_HINTS:
+    case BFD_MACH_O_LC_PREBIND_CKSUM:
+      break;
+    default:
+      fprintf (stderr, "unable to read unknown load command 0x%lx\n",
+	       (unsigned long) command->type);
+      break;
+    }
+
+  return 0;
+}
+
+static void
+bfd_mach_o_flatten_sections (abfd)
+     bfd *abfd;
+{
+  bfd_mach_o_data_struct *mdata = abfd->tdata.mach_o_data;
+  long csect = 0;
+  unsigned long i, j;
+  
+  mdata->nsects = 0;
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      if (mdata->commands[i].type == BFD_MACH_O_LC_SEGMENT)
+	{
+	  bfd_mach_o_segment_command *seg = &mdata->commands[i].command.segment;
+	  mdata->nsects += seg->nsects;
+	}
+    }
+
+  mdata->sections = bfd_alloc (abfd, mdata->nsects * sizeof (bfd_mach_o_section *));
+  csect = 0;
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      if (mdata->commands[i].type == BFD_MACH_O_LC_SEGMENT)
+	{
+	  bfd_mach_o_segment_command *seg = &mdata->commands[i].command.segment;
+
+	  BFD_ASSERT (csect + seg->nsects <= mdata->nsects);
+
+	  for (j = 0; j < seg->nsects; j++)
+	    mdata->sections[csect++] = &seg->sections[j];
+	}
+    }
+}
+
+int
+bfd_mach_o_scan_start_address (abfd)
+     bfd *abfd;
+{
+  bfd_mach_o_data_struct *mdata = abfd->tdata.mach_o_data;
+  bfd_mach_o_thread_command *cmd = NULL;
+  unsigned long i;
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      if ((mdata->commands[i].type == BFD_MACH_O_LC_THREAD) ||
+	  (mdata->commands[i].type == BFD_MACH_O_LC_UNIXTHREAD))
+	{
+	  if (cmd == NULL)
+	    cmd = &mdata->commands[i].command.thread;
+	  else
+	    return 0;
+	}
+    }
+
+  if (cmd == NULL)
+    return 0;
+
+  for (i = 0; i < cmd->nflavours; i++)
+    {
+      if ((mdata->header.cputype == BFD_MACH_O_CPU_TYPE_I386) 
+	  && (cmd->flavours[i].flavour == (unsigned long) BFD_MACH_O_i386_THREAD_STATE))
+	{
+	  unsigned char buf[4];
+
+	  bfd_seek (abfd, cmd->flavours[i].offset + 40, SEEK_SET);
+
+	  if (bfd_bread (buf, 4, abfd) != 4)
+	    return -1;
+
+	  abfd->start_address = bfd_h_get_32 (abfd, buf);
+	}
+      else if ((mdata->header.cputype == BFD_MACH_O_CPU_TYPE_POWERPC) 
+	       && (cmd->flavours[i].flavour == BFD_MACH_O_PPC_THREAD_STATE))
+	{
+	  unsigned char buf[4];
+
+	  bfd_seek (abfd, cmd->flavours[i].offset + 0, SEEK_SET);
+
+	  if (bfd_bread (buf, 4, abfd) != 4)
+	    return -1;
+
+	  abfd->start_address = bfd_h_get_32 (abfd, buf);
+	}
+    }
+
+  return 0;
+}
+
+int
+bfd_mach_o_scan (abfd, header)
+     bfd *abfd;
+     bfd_mach_o_header *header;
+{
+  unsigned int i;
+  bfd_mach_o_data_struct *mdata = NULL;
+  enum bfd_architecture cputype;
+  unsigned long cpusubtype;
+
+  mdata = ((bfd_mach_o_data_struct *) 
+	   bfd_alloc (abfd, sizeof (bfd_mach_o_data_struct)));
+  if (mdata == NULL)
+    return -1;
+
+  mdata->header = *header;
+  mdata->symbols = NULL;
+
+  abfd->flags = abfd->xvec->object_flags | (abfd->flags & (BFD_IN_MEMORY | BFD_IO_FUNCS));  
+  abfd->tdata.mach_o_data = mdata;
+
+  bfd_mach_o_convert_architecture (header->cputype, header->cpusubtype, &cputype, &cpusubtype);
+  if (cputype == bfd_arch_unknown)
+    {
+      fprintf (stderr, "bfd_mach_o_scan: unknown architecture 0x%lx/0x%lx\n",
+	       header->cputype, header->cpusubtype);
+      return -1;
+    }
+
+  bfd_set_arch_mach (abfd, cputype, cpusubtype);
+  
+  if (header->ncmds != 0)
+    {
+      mdata->commands = 
+	((bfd_mach_o_load_command *)
+	 bfd_alloc (abfd, header->ncmds * sizeof (bfd_mach_o_load_command)));
+      if (mdata->commands == NULL)
+	return -1;
+    
+      for (i = 0; i < header->ncmds; i++)
+	{
+	  bfd_mach_o_load_command *cur = &mdata->commands[i];
+
+	  if (i == 0)
+	    cur->offset = 28;
+	  else
+	    {
+	      bfd_mach_o_load_command *prev = &mdata->commands[i - 1];
+	      cur->offset = prev->offset + prev->len;
+	    }
+
+	  if (bfd_mach_o_scan_read_command (abfd, cur) < 0)
+	    return -1;
+	} 
+    }
+
+  if (bfd_mach_o_scan_start_address (abfd) < 0)
+    {
+#if 0
+      fprintf (stderr, "bfd_mach_o_scan: unable to scan start address: %s\n",
+	       bfd_errmsg (bfd_get_error ()));
+      abfd->tdata.mach_o_data = NULL;
+      return -1;
+#endif
+    }
+
+  bfd_mach_o_flatten_sections (abfd);
+
+  return 0;
+}
+
+boolean
+bfd_mach_o_mkobject (abfd)
+     bfd *abfd;
+{
+  bfd_mach_o_data_struct *mdata = NULL;
+
+  mdata = ((bfd_mach_o_data_struct *) 
+	   bfd_alloc (abfd, sizeof (bfd_mach_o_data_struct)));
+  if (mdata == NULL)
+    return false;
+  abfd->tdata.mach_o_data = mdata;
+
+  mdata->header.magic = 0;
+  mdata->header.cputype = 0;
+  mdata->header.cpusubtype = 0;
+  mdata->header.filetype = 0;
+  mdata->header.ncmds = 0;
+  mdata->header.sizeofcmds = 0;
+  mdata->header.flags = 0;
+  mdata->header.byteorder = BFD_ENDIAN_UNKNOWN;
+  mdata->commands = NULL;
+  mdata->nsymbols = 0;
+  mdata->symbols = NULL;
+  mdata->nsects = 0;
+  mdata->sections = NULL;
+  mdata->ibfd = NULL;
+
+  return true;
+}
+
+const bfd_target *
+bfd_mach_o_object_p (abfd)
+     bfd *abfd;
+{
+  bfd_mach_o_header header;
+
+  if (bfd_mach_o_read_header (abfd, &header) != 0)
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+
+  if (! ((header.byteorder == BFD_ENDIAN_BIG)
+	 || (header.byteorder == BFD_ENDIAN_LITTLE)))
+    {
+      fprintf (stderr, "unknown header byte-order value 0x%lx\n", (long) header.byteorder);
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+
+  if (! (((header.byteorder == BFD_ENDIAN_BIG) 
+	  && (abfd->xvec->byteorder == BFD_ENDIAN_BIG)
+	  && (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG))
+	 ||
+	 ((header.byteorder == BFD_ENDIAN_LITTLE) 
+	  && (abfd->xvec->byteorder == BFD_ENDIAN_LITTLE) 
+	  && (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE))))
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+
+  abfd->tdata.mach_o_data = NULL;
+
+  if (bfd_mach_o_scan (abfd, &header) != 0)
+    {
+      abfd->tdata.mach_o_data = NULL;
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+  
+  return abfd->xvec;
+}
+
+const bfd_target *
+bfd_mach_o_core_p (abfd)
+     bfd *abfd;
+{
+  bfd_mach_o_header header;
+
+  bfd_set_error (bfd_error_wrong_format);
+
+  if (bfd_mach_o_read_header (abfd, &header) != 0)
+    return NULL;
+
+  if (! ((header.byteorder == BFD_ENDIAN_BIG)
+	 || (header.byteorder == BFD_ENDIAN_LITTLE)))
+    {
+      fprintf (stderr, "unknown header byte-order value 0x%lx\n", (long) header.byteorder);
+      abort ();
+    }
+
+  if (! (((header.byteorder == BFD_ENDIAN_BIG) 
+	  && (abfd->xvec->byteorder == BFD_ENDIAN_BIG)
+	  && (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG))
+	 ||
+	 ((header.byteorder == BFD_ENDIAN_LITTLE) 
+	  && (abfd->xvec->byteorder == BFD_ENDIAN_LITTLE) 
+	  && (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE))))
+    return NULL;
+
+  if (header.filetype != BFD_MACH_O_MH_CORE)
+    return NULL;
+
+  abfd->tdata.mach_o_data = NULL;
+  if (bfd_mach_o_scan (abfd, &header) != 0)
+    {
+      abfd->tdata.mach_o_data = NULL;
+      return NULL;
+    }
+  
+  return abfd->xvec;
+}
+
+typedef struct mach_o_fat_archentry
+{
+  unsigned long cputype;
+  unsigned long cpusubtype;
+  unsigned long offset;
+  unsigned long size;
+  unsigned long align;
+  bfd *abfd;
+} mach_o_fat_archentry;
+
+typedef struct mach_o_fat_data_struct
+{
+  unsigned long magic;
+  unsigned long nfat_arch;
+  mach_o_fat_archentry *archentries;
+} mach_o_fat_data_struct;
+
+const bfd_target *
+bfd_mach_o_archive_p (abfd)
+     bfd *abfd;
+{
+  mach_o_fat_data_struct *adata;
+  unsigned char buf[20];
+  unsigned long i;
+
+  bfd_seek (abfd, 0, SEEK_SET);
+  if (bfd_bread ((PTR) buf, 8, abfd) != 8)
+    return NULL;
+
+  adata = (mach_o_fat_data_struct *) 
+    bfd_alloc (abfd, sizeof (mach_o_fat_data_struct));
+  if (adata == NULL)
+    return NULL;
+  
+  adata->magic = bfd_getb32 (buf);
+  adata->nfat_arch = bfd_getb32 (buf + 4);
+  if (adata->magic != 0xcafebabe)
+    return NULL;
+
+  adata->archentries = (mach_o_fat_archentry *) 
+    bfd_alloc (abfd, adata->nfat_arch * sizeof (mach_o_fat_archentry));
+  if (adata->archentries == NULL)
+    return NULL;
+
+  for (i = 0; i < adata->nfat_arch; i++)
+    {
+      bfd_seek (abfd, 8 + 20 * i, SEEK_SET);
+
+      if (bfd_bread ((PTR) buf, 20, abfd) != 20)
+	return NULL;
+      adata->archentries[i].cputype = bfd_getb32 (buf);
+      adata->archentries[i].cpusubtype = bfd_getb32 (buf + 4);
+      adata->archentries[i].offset = bfd_getb32 (buf + 8);
+      adata->archentries[i].size = bfd_getb32 (buf + 12);
+      adata->archentries[i].align = bfd_getb32 (buf + 16);
+      adata->archentries[i].abfd = NULL;
+    }
+
+  abfd->tdata.mach_o_fat_data = adata;
+  return abfd->xvec;
+}
+
+bfd *
+bfd_mach_o_openr_next_archived_file (archive, prev)
+  bfd *archive;
+  bfd *prev;
+{
+  mach_o_fat_data_struct *adata = (mach_o_fat_data_struct *) archive->tdata.mach_o_fat_data;
+  mach_o_fat_archentry *entry = NULL;
+  unsigned long i;
+
+  BFD_ASSERT (adata != NULL);
+
+  /* Find index of previous entry.  */
+  if (prev == NULL)
+    i = 0;	/* Start at first one.  */
+  else
+    {
+      for (i = 0; i < adata->nfat_arch; i++)
+	{
+	  if (adata->archentries[i].abfd == prev)
+	    break;
+	}
+
+      if (i == adata->nfat_arch)
+	{
+	  /* Not found.  */
+	  bfd_set_error (bfd_error_bad_value);
+	  return NULL; 
+	}
+    i++;	/* Get next entry.  */
+  }
+  
+  if (i >= adata->nfat_arch)
+    {
+      bfd_set_error (bfd_error_no_more_archived_files);
+      return NULL;
+    }
+
+  entry = &adata->archentries[i];
+  if (entry->abfd == NULL)
+    {
+      bfd *nbfd = _bfd_new_bfd_contained_in (archive);
+      char *s = NULL;
+
+      if (nbfd == NULL)
+	return NULL;
+
+      nbfd->origin = entry->offset;
+      s = bfd_malloc (strlen (archive->filename) + 1);
+      if (s == NULL)
+	return NULL;
+      strcpy (s, archive->filename);
+      nbfd->filename = s;
+      nbfd->iostream = NULL;
+      entry->abfd = nbfd;
+    }
+
+  return entry->abfd;
+}
+
+int bfd_mach_o_lookup_section 
+  (bfd *abfd, asection *section, 
+   bfd_mach_o_load_command **mcommand, bfd_mach_o_section **msection)
+{
+  struct mach_o_data_struct *md = abfd->tdata.mach_o_data;
+  unsigned int i, j, num;
+
+  bfd_mach_o_load_command *ncmd = NULL;
+  bfd_mach_o_section *nsect = NULL;
+
+  BFD_ASSERT (mcommand != NULL);
+  BFD_ASSERT (msection != NULL);
+
+  num = 0;
+  for (i = 0; i < md->header.ncmds; i++)
+    {
+      struct bfd_mach_o_load_command *cmd = &md->commands[i];
+      struct bfd_mach_o_segment_command *seg = NULL;
+
+      if (cmd->type != BFD_MACH_O_LC_SEGMENT)
+	continue;
+      seg = &cmd->command.segment;
+    
+      if (seg->segment == section)
+	{
+	  if (num == 0)
+	    ncmd = cmd;
+	  num++;
+	}
+
+      for (j = 0; j < seg->nsects; j++)
+	{
+	  struct bfd_mach_o_section *sect = &seg->sections[j];
+
+	  if (sect->bfdsection == section)
+	    {
+	      if (num == 0)
+		nsect = sect;
+	      num++;
+	    }
+	}
+    }
+  
+  *mcommand = ncmd;
+  *msection = nsect;
+  return num;
+}
+
+int
+bfd_mach_o_lookup_command 
+  (bfd *abfd, bfd_mach_o_load_command_type type,
+   bfd_mach_o_load_command **mcommand)
+{
+  struct mach_o_data_struct *md = NULL;
+  bfd_mach_o_load_command *ncmd = NULL;
+  unsigned int i, num;
+
+  md = abfd->tdata.mach_o_data;
+
+  BFD_ASSERT (md != NULL);
+  BFD_ASSERT (mcommand != NULL);
+
+  num = 0;
+  for (i = 0; i < md->header.ncmds; i++)
+    {
+      struct bfd_mach_o_load_command *cmd = &md->commands[i];
+
+      if (cmd->type != type)
+	continue;
+
+      if (num == 0)
+	ncmd = cmd;
+      num++;
+    }
+
+  *mcommand = ncmd;
+  return num;
+}
+
+unsigned long
+bfd_mach_o_stack_addr (type)
+     enum bfd_mach_o_cpu_type type;
+{
+  switch (type)
+    {
+    case BFD_MACH_O_CPU_TYPE_MC680x0:
+      return 0x04000000;
+    case BFD_MACH_O_CPU_TYPE_MC88000:
+      return 0xffffe000;
+    case BFD_MACH_O_CPU_TYPE_POWERPC:
+      return 0xc0000000;
+    case BFD_MACH_O_CPU_TYPE_I386:
+      return 0xc0000000;
+    case BFD_MACH_O_CPU_TYPE_SPARC:
+      return 0xf0000000;
+    case BFD_MACH_O_CPU_TYPE_I860:
+      return 0;
+    case BFD_MACH_O_CPU_TYPE_HPPA:
+      return (0xc0000000-0x04000000);
+    default:
+      return 0;
+    }
+}
+
+int
+bfd_mach_o_core_fetch_environment (abfd, rbuf, rlen)
+     bfd *abfd;
+     unsigned char **rbuf;
+     unsigned int *rlen;
+{
+  bfd_mach_o_data_struct *mdata = abfd->tdata.mach_o_data;
+  unsigned long stackaddr = bfd_mach_o_stack_addr (mdata->header.cputype);
+  unsigned int i = 0;
+
+  for (i = 0; i < mdata->header.ncmds; i++)
+    {
+      bfd_mach_o_load_command *cur = &mdata->commands[i];
+      bfd_mach_o_segment_command *seg = NULL;
+
+      if (cur->type != BFD_MACH_O_LC_SEGMENT)
+	continue;
+
+      seg = &cur->command.segment;
+
+      if ((seg->vmaddr + seg->vmsize) == stackaddr)
+	{
+	  unsigned long start = seg->fileoff;
+	  unsigned long end = seg->fileoff + seg->filesize;
+	  unsigned char *buf = bfd_malloc (1024);
+	  unsigned long size = 1024;
+
+	  for (;;)
+	    {
+	      bfd_size_type nread = 0;
+	      unsigned long offset;
+	      int found_nonnull = 0;
+
+	      if (size > (end - start))
+		size = (end - start);
+
+	      buf = bfd_realloc (buf, size);
+
+	      bfd_seek (abfd, end - size, SEEK_SET);
+	      nread = bfd_bread (buf, size, abfd);
+	
+	      if (nread != size)
+		return -1;
+      
+	      for (offset = 4; offset <= size; offset += 4)
+		{
+		  unsigned long val =  *((unsigned long *) (buf + size - offset));
+
+		  if (! found_nonnull)
+		    {
+		      if (val != 0)
+			found_nonnull = 1;
+		    }
+		  else if (val == 0x0)
+		    {
+		      unsigned long bottom = seg->fileoff + seg->filesize - offset;
+		      unsigned long top = seg->fileoff + seg->filesize - 4;
+
+		      *rbuf = bfd_malloc (top - bottom);
+		      *rlen = top - bottom;
+
+		      memcpy (*rbuf, buf + size - *rlen, *rlen);
+		      return 0;
+		    }
+		}
+
+	      if (size == (end - start))
+		break;
+
+	      size *= 2;
+	    }
+	}
+    }
+
+  return -1;
+}
+
+char *
+bfd_mach_o_core_file_failing_command (abfd)
+     bfd *abfd;
+{
+  unsigned char *buf = NULL;
+  unsigned int len = 0;
+  int ret = -1;
+
+  ret = bfd_mach_o_core_fetch_environment (abfd, &buf, &len);
+  if (ret < 0)
+    return NULL;
+
+  return buf;
+}
+
+int
+bfd_mach_o_core_file_failing_signal (abfd)
+     bfd *abfd ATTRIBUTE_UNUSED;
+{
+  return 0;
+}
+
+boolean
+bfd_mach_o_core_file_matches_executable_p (core_bfd, exec_bfd)
+     bfd *core_bfd ATTRIBUTE_UNUSED;
+     bfd *exec_bfd ATTRIBUTE_UNUSED;
+{
+  return true;
+}
+
+#define TARGET_NAME mach_o_be_vec
+#define TARGET_STRING "mach-o-be"
+#define TARGET_BIG_ENDIAN 1
+#define TARGET_ARCHIVE 0
+
+#include "mach-o-target.c"
+
+#undef TARGET_NAME
+#undef TARGET_STRING
+#undef TARGET_BIG_ENDIAN
+#undef TARGET_ARCHIVE
+
+#define TARGET_NAME mach_o_le_vec
+#define TARGET_STRING "mach-o-le"
+#define TARGET_BIG_ENDIAN 0
+#define TARGET_ARCHIVE 0
+
+#include "mach-o-target.c"
+
+#undef TARGET_NAME
+#undef TARGET_STRING
+#undef TARGET_BIG_ENDIAN
+#undef TARGET_ARCHIVE
+
+#define TARGET_NAME mach_o_fat_vec
+#define TARGET_STRING "mach-o-fat"
+#define TARGET_BIG_ENDIAN 1
+#define TARGET_ARCHIVE 1
+
+#include "mach-o-target.c"
+
+#undef TARGET_NAME
+#undef TARGET_STRING
+#undef TARGET_BIG_ENDIAN
+#undef TARGET_ARCHIVE
+