trunk/bfd/coffcode.h

/* Support for the generic parts of most COFF variants, for BFD.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
   Free Software Foundation, Inc.
   Written by Cygnus Support.

   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

/* Most of this hacked by  Steve Chamberlain,
                        sac@cygnus.com.  */
/*
SECTION
        coff backends

        BFD supports a number of different flavours of coff format.
        The major differences between formats are the sizes and
        alignments of fields in structures on disk, and the occasional
        extra field.

        Coff in all its varieties is implemented with a few common
        files and a number of implementation specific files. For
        example, The 88k bcs coff format is implemented in the file
        @file{coff-m88k.c}. This file @code{#include}s
        @file{coff/m88k.h} which defines the external structure of the
        coff format for the 88k, and @file{coff/internal.h} which
        defines the internal structure. @file{coff-m88k.c} also
        defines the relocations used by the 88k format
        @xref{Relocations}.

        The Intel i960 processor version of coff is implemented in
        @file{coff-i960.c}. This file has the same structure as
        @file{coff-m88k.c}, except that it includes @file{coff/i960.h}
        rather than @file{coff-m88k.h}.

SUBSECTION
        Porting to a new version of coff

        The recommended method is to select from the existing
        implementations the version of coff which is most like the one
        you want to use.  For example, we'll say that i386 coff is
        the one you select, and that your coff flavour is called foo.
        Copy @file{i386coff.c} to @file{foocoff.c}, copy
        @file{../include/coff/i386.h} to @file{../include/coff/foo.h},
        and add the lines to @file{targets.c} and @file{Makefile.in}
        so that your new back end is used. Alter the shapes of the
        structures in @file{../include/coff/foo.h} so that they match
        what you need. You will probably also have to add
        @code{#ifdef}s to the code in @file{coff/internal.h} and
        @file{coffcode.h} if your version of coff is too wild.

        You can verify that your new BFD backend works quite simply by
        building @file{objdump} from the @file{binutils} directory,
        and making sure that its version of what's going on and your
        host system's idea (assuming it has the pretty standard coff
        dump utility, usually called @code{att-dump} or just
        @code{dump}) are the same.  Then clean up your code, and send
        what you've done to Cygnus. Then your stuff will be in the
        next release, and you won't have to keep integrating it.

SUBSECTION
        How the coff backend works

SUBSUBSECTION
        File layout

        The Coff backend is split into generic routines that are
        applicable to any Coff target and routines that are specific
        to a particular target.  The target-specific routines are
        further split into ones which are basically the same for all
        Coff targets except that they use the external symbol format
        or use different values for certain constants.

        The generic routines are in @file{coffgen.c}.  These routines
        work for any Coff target.  They use some hooks into the target
        specific code; the hooks are in a @code{bfd_coff_backend_data}
        structure, one of which exists for each target.

        The essentially similar target-specific routines are in
        @file{coffcode.h}.  This header file includes executable C code.
        The various Coff targets first include the appropriate Coff
        header file, make any special defines that are needed, and
        then include @file{coffcode.h}.

        Some of the Coff targets then also have additional routines in
        the target source file itself.

        For example, @file{coff-i960.c} includes
        @file{coff/internal.h} and @file{coff/i960.h}.  It then
        defines a few constants, such as @code{I960}, and includes
        @file{coffcode.h}.  Since the i960 has complex relocation
        types, @file{coff-i960.c} also includes some code to
        manipulate the i960 relocs.  This code is not in
        @file{coffcode.h} because it would not be used by any other
        target.

SUBSUBSECTION
        Coff long section names

        In the standard Coff object format, section names are limited to
        the eight bytes available in the @code{s_name} field of the
        @code{SCNHDR} section header structure.  The format requires the
        field to be NUL-padded, but not necessarily NUL-terminated, so
        the longest section names permitted are a full eight characters.

        The Microsoft PE variants of the Coff object file format add
        an extension to support the use of long section names.  This
        extension is defined in section 4 of the Microsoft PE/COFF 
        specification (rev 8.1).  If a section name is too long to fit
        into the section header's @code{s_name} field, it is instead
        placed into the string table, and the @code{s_name} field is
        filled with a slash ("/") followed by the ASCII decimal 
        representation of the offset of the full name relative to the
        string table base.

        Note that this implies that the extension can only be used in object
        files, as executables do not contain a string table.  The standard
        specifies that long section names from objects emitted into executable
        images are to be truncated.

        However, as a GNU extension, BFD can generate executable images
        that contain a string table and long section names.  This
        would appear to be technically valid, as the standard only says
        that Coff debugging information is deprecated, not forbidden,
        and in practice it works, although some tools that parse PE files
        expecting the MS standard format may become confused; @file{PEview} is
        one known example.

        The functionality is supported in BFD by code implemented under 
        the control of the macro @code{COFF_LONG_SECTION_NAMES}.  If not
        defined, the format does not support long section names in any way.
        If defined, it is used to initialise a flag, 
        @code{_bfd_coff_long_section_names}, and a hook function pointer, 
        @code{_bfd_coff_set_long_section_names}, in the Coff backend data
        structure.  The flag controls the generation of long section names
        in output BFDs at runtime; if it is false, as it will be by default
        when generating an executable image, long section names are truncated;
        if true, the long section names extension is employed.  The hook
        points to a function that allows the value of the flag to be altered
        at runtime, on formats that support long section names at all; on
        other formats it points to a stub that returns an error indication.
        
        With input BFDs, the flag is set according to whether any long section
        names are detected while reading the section headers.  For a completely
        new BFD, the flag is set to the default for the target format.  This
        information can be used by a client of the BFD library when deciding
        what output format to generate, and means that a BFD that is opened
        for read and subsequently converted to a writeable BFD and modified
        in-place will retain whatever format it had on input.

        If @code{COFF_LONG_SECTION_NAMES} is simply defined (blank), or is
        defined to the value "1", then long section names are enabled by
        default; if it is defined to the value zero, they are disabled by
        default (but still accepted in input BFDs).  The header @file{coffcode.h}
        defines a macro, @code{COFF_DEFAULT_LONG_SECTION_NAMES}, which is
        used in the backends to initialise the backend data structure fields
        appropriately; see the comments for further detail.

SUBSUBSECTION
        Bit twiddling

        Each flavour of coff supported in BFD has its own header file
        describing the external layout of the structures. There is also
        an internal description of the coff layout, in
        @file{coff/internal.h}. A major function of the
        coff backend is swapping the bytes and twiddling the bits to
        translate the external form of the structures into the normal
        internal form. This is all performed in the
        @code{bfd_swap}_@i{thing}_@i{direction} routines. Some
        elements are different sizes between different versions of
        coff; it is the duty of the coff version specific include file
        to override the definitions of various packing routines in
        @file{coffcode.h}. E.g., the size of line number entry in coff is
        sometimes 16 bits, and sometimes 32 bits. @code{#define}ing
        @code{PUT_LNSZ_LNNO} and @code{GET_LNSZ_LNNO} will select the
        correct one. No doubt, some day someone will find a version of
        coff which has a varying field size not catered to at the
        moment. To port BFD, that person will have to add more @code{#defines}.
        Three of the bit twiddling routines are exported to
        @code{gdb}; @code{coff_swap_aux_in}, @code{coff_swap_sym_in}
        and @code{coff_swap_lineno_in}. @code{GDB} reads the symbol
        table on its own, but uses BFD to fix things up.  More of the
        bit twiddlers are exported for @code{gas};
        @code{coff_swap_aux_out}, @code{coff_swap_sym_out},
        @code{coff_swap_lineno_out}, @code{coff_swap_reloc_out},
        @code{coff_swap_filehdr_out}, @code{coff_swap_aouthdr_out},
        @code{coff_swap_scnhdr_out}. @code{Gas} currently keeps track
        of all the symbol table and reloc drudgery itself, thereby
        saving the internal BFD overhead, but uses BFD to swap things
        on the way out, making cross ports much safer.  Doing so also
        allows BFD (and thus the linker) to use the same header files
        as @code{gas}, which makes one avenue to disaster disappear.

SUBSUBSECTION
        Symbol reading

        The simple canonical form for symbols used by BFD is not rich
        enough to keep all the information available in a coff symbol
        table. The back end gets around this problem by keeping the original
        symbol table around, "behind the scenes".

        When a symbol table is requested (through a call to
        @code{bfd_canonicalize_symtab}), a request gets through to
        @code{coff_get_normalized_symtab}. This reads the symbol table from
        the coff file and swaps all the structures inside into the
        internal form. It also fixes up all the pointers in the table
        (represented in the file by offsets from the first symbol in
        the table) into physical pointers to elements in the new
        internal table. This involves some work since the meanings of
        fields change depending upon context: a field that is a
        pointer to another structure in the symbol table at one moment
        may be the size in bytes of a structure at the next.  Another
        pass is made over the table. All symbols which mark file names
        (<<C_FILE>> symbols) are modified so that the internal
        string points to the value in the auxent (the real filename)
        rather than the normal text associated with the symbol
        (@code{".file"}).

        At this time the symbol names are moved around. Coff stores
        all symbols less than nine characters long physically
        within the symbol table; longer strings are kept at the end of
        the file in the string table. This pass moves all strings
        into memory and replaces them with pointers to the strings.

        The symbol table is massaged once again, this time to create
        the canonical table used by the BFD application. Each symbol
        is inspected in turn, and a decision made (using the
        @code{sclass} field) about the various flags to set in the
        @code{asymbol}.  @xref{Symbols}. The generated canonical table
        shares strings with the hidden internal symbol table.

        Any linenumbers are read from the coff file too, and attached
        to the symbols which own the functions the linenumbers belong to.

SUBSUBSECTION
        Symbol writing

        Writing a symbol to a coff file which didn't come from a coff
        file will lose any debugging information. The @code{asymbol}
        structure remembers the BFD from which the symbol was taken, and on
        output the back end makes sure that the same destination target as
        source target is present.

        When the symbols have come from a coff file then all the
        debugging information is preserved.

        Symbol tables are provided for writing to the back end in a
        vector of pointers to pointers. This allows applications like
        the linker to accumulate and output large symbol tables
        without having to do too much byte copying.

        This function runs through the provided symbol table and
        patches each symbol marked as a file place holder
        (@code{C_FILE}) to point to the next file place holder in the
        list. It also marks each @code{offset} field in the list with
        the offset from the first symbol of the current symbol.

        Another function of this procedure is to turn the canonical
        value form of BFD into the form used by coff. Internally, BFD
        expects symbol values to be offsets from a section base; so a
        symbol physically at 0x120, but in a section starting at
        0x100, would have the value 0x20. Coff expects symbols to
        contain their final value, so symbols have their values
        changed at this point to reflect their sum with their owning
        section.  This transformation uses the
        <<output_section>> field of the @code{asymbol}'s
        @code{asection} @xref{Sections}.

        o <<coff_mangle_symbols>>

        This routine runs though the provided symbol table and uses
        the offsets generated by the previous pass and the pointers
        generated when the symbol table was read in to create the
        structured hierarchy required by coff. It changes each pointer
        to a symbol into the index into the symbol table of the asymbol.

        o <<coff_write_symbols>>

        This routine runs through the symbol table and patches up the
        symbols from their internal form into the coff way, calls the
        bit twiddlers, and writes out the table to the file.

*/

/*
INTERNAL_DEFINITION
        coff_symbol_type

DESCRIPTION
        The hidden information for an <<asymbol>> is described in a
        <<combined_entry_type>>:

CODE_FRAGMENT
.
.typedef struct coff_ptr_struct
.{
.  {* Remembers the offset from the first symbol in the file for
.     this symbol. Generated by coff_renumber_symbols. *}
.  unsigned int offset;
.
.  {* Should the value of this symbol be renumbered.  Used for
.     XCOFF C_BSTAT symbols.  Set by coff_slurp_symbol_table.  *}
.  unsigned int fix_value : 1;
.
.  {* Should the tag field of this symbol be renumbered.
.     Created by coff_pointerize_aux. *}
.  unsigned int fix_tag : 1;
.
.  {* Should the endidx field of this symbol be renumbered.
.     Created by coff_pointerize_aux. *}
.  unsigned int fix_end : 1;
.
.  {* Should the x_csect.x_scnlen field be renumbered.
.     Created by coff_pointerize_aux. *}
.  unsigned int fix_scnlen : 1;
.
.  {* Fix up an XCOFF C_BINCL/C_EINCL symbol.  The value is the
.     index into the line number entries.  Set by coff_slurp_symbol_table.  *}
.  unsigned int fix_line : 1;
.
.  {* The container for the symbol structure as read and translated
.     from the file. *}
.  union
.  {
.    union internal_auxent auxent;
.    struct internal_syment syment;
.  } u;
.} combined_entry_type;
.
.
.{* Each canonical asymbol really looks like this: *}
.
.typedef struct coff_symbol_struct
.{
.  {* The actual symbol which the rest of BFD works with *}
.  asymbol symbol;
.
.  {* A pointer to the hidden information for this symbol *}
.  combined_entry_type *native;
.
.  {* A pointer to the linenumber information for this symbol *}
.  struct lineno_cache_entry *lineno;
.
.  {* Have the line numbers been relocated yet ? *}
.  bfd_boolean done_lineno;
.} coff_symbol_type;

*/

#ifdef COFF_WITH_PE
#include "peicode.h"
#else
#include "coffswap.h"
#endif

#define STRING_SIZE_SIZE 4

#define DOT_DEBUG       ".debug"
#define GNU_LINKONCE_WI ".gnu.linkonce.wi."
#define DOT_RELOC       ".reloc"

#if defined (COFF_LONG_SECTION_NAMES)
/* Needed to expand the inputs to BLANKOR1TOODD.  */
#define COFFLONGSECTIONCATHELPER(x,y)    x ## y
/* If the input macro Y is blank or '1', return an odd number; if it is
   '0', return an even number.  Result undefined in all other cases.  */
#define BLANKOR1TOODD(y)                 COFFLONGSECTIONCATHELPER(1,y)
/* Defined to numerical 0 or 1 according to whether generation of long
   section names is disabled or enabled by default.  */
#define COFF_ENABLE_LONG_SECTION_NAMES   (BLANKOR1TOODD(COFF_LONG_SECTION_NAMES) & 1)
/* Where long section names are supported, we allow them to be enabled
   and disabled at runtime, so select an appropriate hook function for
   _bfd_coff_set_long_section_names.  */
#define COFF_LONG_SECTION_NAMES_SETTER   bfd_coff_set_long_section_names_allowed
#else /* !defined (COFF_LONG_SECTION_NAMES) */
/* If long section names are not supported, this stub disallows any
   attempt to enable them at run-time.  */
#define COFF_LONG_SECTION_NAMES_SETTER   bfd_coff_set_long_section_names_disallowed
#endif /* defined (COFF_LONG_SECTION_NAMES) */

/* Define a macro that can be used to initialise both the fields relating
   to long section names in the backend data struct simultaneously.  */
#if COFF_ENABLE_LONG_SECTION_NAMES
#define COFF_DEFAULT_LONG_SECTION_NAMES  (TRUE), COFF_LONG_SECTION_NAMES_SETTER
#else /* !COFF_ENABLE_LONG_SECTION_NAMES */
#define COFF_DEFAULT_LONG_SECTION_NAMES  (FALSE), COFF_LONG_SECTION_NAMES_SETTER
#endif /* COFF_ENABLE_LONG_SECTION_NAMES */

#if defined (COFF_LONG_SECTION_NAMES)
static bfd_boolean bfd_coff_set_long_section_names_allowed
  (bfd *, int);
#else /* !defined (COFF_LONG_SECTION_NAMES) */
static bfd_boolean bfd_coff_set_long_section_names_disallowed
  (bfd *, int);
#endif /* defined (COFF_LONG_SECTION_NAMES) */
static long sec_to_styp_flags
  (const char *, flagword);
static bfd_boolean styp_to_sec_flags
  (bfd *, void *, const char *, asection *, flagword *);
static bfd_boolean coff_bad_format_hook
  (bfd *, void *);
static void coff_set_custom_section_alignment
  (bfd *, asection *, const struct coff_section_alignment_entry *,
   const unsigned int);
static bfd_boolean coff_new_section_hook
  (bfd *, asection *);
static bfd_boolean coff_set_arch_mach_hook
  (bfd *, void *);
static bfd_boolean coff_write_relocs
  (bfd *, int);
static bfd_boolean coff_set_flags
  (bfd *, unsigned int *, unsigned short *);
static bfd_boolean coff_set_arch_mach
  (bfd *, enum bfd_architecture, unsigned long) ATTRIBUTE_UNUSED;
static bfd_boolean coff_compute_section_file_positions
  (bfd *);
static bfd_boolean coff_write_object_contents
  (bfd *) ATTRIBUTE_UNUSED;
static bfd_boolean coff_set_section_contents
  (bfd *, asection *, const void *, file_ptr, bfd_size_type);
static void * buy_and_read
  (bfd *, file_ptr, bfd_size_type);
static bfd_boolean coff_slurp_line_table
  (bfd *, asection *);
static bfd_boolean coff_slurp_symbol_table
  (bfd *);
static enum coff_symbol_classification coff_classify_symbol
  (bfd *, struct internal_syment *);
static bfd_boolean coff_slurp_reloc_table
  (bfd *, asection *, asymbol **);
static long coff_canonicalize_reloc
  (bfd *, asection *, arelent **, asymbol **);
#ifndef coff_mkobject_hook
static void * coff_mkobject_hook
  (bfd *, void *,  void *);
#endif
#ifdef COFF_WITH_PE
static flagword handle_COMDAT
  (bfd *, flagword, void *, const char *, asection *);
#endif
#ifdef COFF_IMAGE_WITH_PE
static bfd_boolean coff_read_word
  (bfd *, unsigned int *);
static unsigned int coff_compute_checksum
  (bfd *);
static bfd_boolean coff_apply_checksum
  (bfd *);
#endif
#ifdef TICOFF
static bfd_boolean ticoff0_bad_format_hook
  (bfd *, void * );
static bfd_boolean ticoff1_bad_format_hook
  (bfd *, void * );
#endif

/* void warning(); */

#if defined (COFF_LONG_SECTION_NAMES)
static bfd_boolean
bfd_coff_set_long_section_names_allowed (bfd *abfd, int enable)
{
  coff_backend_info (abfd)->_bfd_coff_long_section_names = enable;
  return TRUE;
}
#else /* !defined (COFF_LONG_SECTION_NAMES) */
static bfd_boolean
bfd_coff_set_long_section_names_disallowed (bfd *abfd, int enable)
{
  (void) abfd;
  (void) enable;
  return FALSE;
}
#endif /* defined (COFF_LONG_SECTION_NAMES) */

/* Return a word with STYP_* (scnhdr.s_flags) flags set to represent
   the incoming SEC_* flags.  The inverse of this function is
   styp_to_sec_flags().  NOTE: If you add to/change this routine, you
   should probably mirror the changes in styp_to_sec_flags().  */

#ifndef COFF_WITH_PE

/* Macros for setting debugging flags.  */

#ifdef STYP_DEBUG
#define STYP_XCOFF_DEBUG STYP_DEBUG
#else
#define STYP_XCOFF_DEBUG STYP_INFO
#endif

#ifdef COFF_ALIGN_IN_S_FLAGS
#define STYP_DEBUG_INFO STYP_DSECT
#else
#define STYP_DEBUG_INFO STYP_INFO
#endif

static long
sec_to_styp_flags (const char *sec_name, flagword sec_flags)
{
  long styp_flags = 0;

  if (!strcmp (sec_name, _TEXT))
    {
      styp_flags = STYP_TEXT;
    }
  else if (!strcmp (sec_name, _DATA))
    {
      styp_flags = STYP_DATA;
    }
  else if (!strcmp (sec_name, _BSS))
    {
      styp_flags = STYP_BSS;
#ifdef _COMMENT
    }
  else if (!strcmp (sec_name, _COMMENT))
    {
      styp_flags = STYP_INFO;
#endif /* _COMMENT */
#ifdef _LIB
    }
  else if (!strcmp (sec_name, _LIB))
    {
      styp_flags = STYP_LIB;
#endif /* _LIB */
#ifdef _LIT
    }
  else if (!strcmp (sec_name, _LIT))
    {
      styp_flags = STYP_LIT;
#endif /* _LIT */
    }
  else if (CONST_STRNEQ (sec_name, DOT_DEBUG))
    {
      /* Handle the XCOFF debug section and DWARF2 debug sections.  */
      if (!sec_name[6])
        styp_flags = STYP_XCOFF_DEBUG;
      else
        styp_flags = STYP_DEBUG_INFO;
    }
  else if (CONST_STRNEQ (sec_name, ".stab"))
    {
      styp_flags = STYP_DEBUG_INFO;
    }
#ifdef COFF_LONG_SECTION_NAMES
  else if (CONST_STRNEQ (sec_name, GNU_LINKONCE_WI))
    {
      styp_flags = STYP_DEBUG_INFO;
    }
#endif
#ifdef RS6000COFF_C
  else if (!strcmp (sec_name, _PAD))
    {
      styp_flags = STYP_PAD;
    }
  else if (!strcmp (sec_name, _LOADER))
    {
      styp_flags = STYP_LOADER;
    }
  else if (!strcmp (sec_name, _EXCEPT))
    {
      styp_flags = STYP_EXCEPT;
    }
  else if (!strcmp (sec_name, _TYPCHK))
    {
      styp_flags = STYP_TYPCHK;
    }
#endif
  /* Try and figure out what it should be */
  else if (sec_flags & SEC_CODE)
    {
      styp_flags = STYP_TEXT;
    }
  else if (sec_flags & SEC_DATA)
    {
      styp_flags = STYP_DATA;
    }
  else if (sec_flags & SEC_READONLY)
    {
#ifdef STYP_LIT                 /* 29k readonly text/data section */
      styp_flags = STYP_LIT;
#else
      styp_flags = STYP_TEXT;
#endif /* STYP_LIT */
    }
  else if (sec_flags & SEC_LOAD)
    {
      styp_flags = STYP_TEXT;
    }
  else if (sec_flags & SEC_ALLOC)
    {
      styp_flags = STYP_BSS;
    }

#ifdef STYP_CLINK
  if (sec_flags & SEC_TIC54X_CLINK)
    styp_flags |= STYP_CLINK;
#endif

#ifdef STYP_BLOCK
  if (sec_flags & SEC_TIC54X_BLOCK)
    styp_flags |= STYP_BLOCK;
#endif

#ifdef STYP_NOLOAD
  if ((sec_flags & (SEC_NEVER_LOAD | SEC_COFF_SHARED_LIBRARY)) != 0)
    styp_flags |= STYP_NOLOAD;
#endif

  return styp_flags;
}

#else /* COFF_WITH_PE */

/* The PE version; see above for the general comments.  The non-PE
   case seems to be more guessing, and breaks PE format; specifically,
   .rdata is readonly, but it sure ain't text.  Really, all this
   should be set up properly in gas (or whatever assembler is in use),
   and honor whatever objcopy/strip, etc. sent us as input.  */

static long
sec_to_styp_flags (const char *sec_name, flagword sec_flags)
{
  long styp_flags = 0;

  /* caution: there are at least three groups of symbols that have
     very similar bits and meanings: IMAGE_SCN*, SEC_*, and STYP_*.
     SEC_* are the BFD internal flags, used for generic BFD
     information.  STYP_* are the COFF section flags which appear in
     COFF files.  IMAGE_SCN_* are the PE section flags which appear in
     PE files.  The STYP_* flags and the IMAGE_SCN_* flags overlap,
     but there are more IMAGE_SCN_* flags.  */

  /* FIXME: There is no gas syntax to specify the debug section flag.  */
  if (CONST_STRNEQ (sec_name, DOT_DEBUG)
      || CONST_STRNEQ (sec_name, GNU_LINKONCE_WI))
    sec_flags = SEC_DEBUGGING | SEC_READONLY;

  /* skip LOAD */
  /* READONLY later */
  /* skip RELOC */
  if ((sec_flags & SEC_CODE) != 0)
    styp_flags |= IMAGE_SCN_CNT_CODE;
  if ((sec_flags & SEC_DATA) != 0)
    styp_flags |= IMAGE_SCN_CNT_INITIALIZED_DATA;
  if ((sec_flags & SEC_ALLOC) != 0 && (sec_flags & SEC_LOAD) == 0)
    styp_flags |= IMAGE_SCN_CNT_UNINITIALIZED_DATA;  /* ==STYP_BSS */
  /* skip ROM */
  /* skip constRUCTOR */
  /* skip CONTENTS */
  if ((sec_flags & SEC_IS_COMMON) != 0)
    styp_flags |= IMAGE_SCN_LNK_COMDAT;
  if ((sec_flags & SEC_DEBUGGING) != 0)
    styp_flags |= IMAGE_SCN_MEM_DISCARDABLE;
  if ((sec_flags & SEC_EXCLUDE) != 0)
    styp_flags |= IMAGE_SCN_LNK_REMOVE;
  if ((sec_flags & SEC_NEVER_LOAD) != 0)
    styp_flags |= IMAGE_SCN_LNK_REMOVE;
  /* skip IN_MEMORY */
  /* skip SORT */
  if (sec_flags & SEC_LINK_ONCE)
    styp_flags |= IMAGE_SCN_LNK_COMDAT;
  /* skip LINK_DUPLICATES */
  /* skip LINKER_CREATED */

  if ((sec_flags & SEC_COFF_NOREAD) == 0)
    styp_flags |= IMAGE_SCN_MEM_READ;     /* Invert NOREAD for read.  */
  if ((sec_flags & SEC_READONLY) == 0)
    styp_flags |= IMAGE_SCN_MEM_WRITE;    /* Invert READONLY for write.  */
  if (sec_flags & SEC_CODE)
    styp_flags |= IMAGE_SCN_MEM_EXECUTE;  /* CODE->EXECUTE.  */
  if (sec_flags & SEC_COFF_SHARED)
    styp_flags |= IMAGE_SCN_MEM_SHARED;   /* Shared remains meaningful.  */

  return styp_flags;
}

#endif /* COFF_WITH_PE */

/* Return a word with SEC_* flags set to represent the incoming STYP_*
   flags (from scnhdr.s_flags).  The inverse of this function is
   sec_to_styp_flags().  NOTE: If you add to/change this routine, you
   should probably mirror the changes in sec_to_styp_flags().  */

#ifndef COFF_WITH_PE

static bfd_boolean
styp_to_sec_flags (bfd *abfd ATTRIBUTE_UNUSED,
                   void * hdr,
                   const char *name,
                   asection *section ATTRIBUTE_UNUSED,
                   flagword *flags_ptr)
{
  struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;
  long styp_flags = internal_s->s_flags;
  flagword sec_flags = 0;

#ifdef STYP_BLOCK
  if (styp_flags & STYP_BLOCK)
    sec_flags |= SEC_TIC54X_BLOCK;
#endif

#ifdef STYP_CLINK
  if (styp_flags & STYP_CLINK)
    sec_flags |= SEC_TIC54X_CLINK;
#endif

#ifdef STYP_NOLOAD
  if (styp_flags & STYP_NOLOAD)
    sec_flags |= SEC_NEVER_LOAD;
#endif /* STYP_NOLOAD */

  /* For 386 COFF, at least, an unloadable text or data section is
     actually a shared library section.  */
  if (styp_flags & STYP_TEXT)
    {
      if (sec_flags & SEC_NEVER_LOAD)
        sec_flags |= SEC_CODE | SEC_COFF_SHARED_LIBRARY;
      else
        sec_flags |= SEC_CODE | SEC_LOAD | SEC_ALLOC;
    }
  else if (styp_flags & STYP_DATA)
    {
      if (sec_flags & SEC_NEVER_LOAD)
        sec_flags |= SEC_DATA | SEC_COFF_SHARED_LIBRARY;
      else
        sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC;
    }
  else if (styp_flags & STYP_BSS)
    {
#ifdef BSS_NOLOAD_IS_SHARED_LIBRARY
      if (sec_flags & SEC_NEVER_LOAD)
        sec_flags |= SEC_ALLOC | SEC_COFF_SHARED_LIBRARY;
      else
#endif
        sec_flags |= SEC_ALLOC;
    }
  else if (styp_flags & STYP_INFO)
    {
      /* We mark these as SEC_DEBUGGING, but only if COFF_PAGE_SIZE is
         defined.  coff_compute_section_file_positions uses
         COFF_PAGE_SIZE to ensure that the low order bits of the
         section VMA and the file offset match.  If we don't know
         COFF_PAGE_SIZE, we can't ensure the correct correspondence,
         and demand page loading of the file will fail.  */
#if defined (COFF_PAGE_SIZE) && !defined (COFF_ALIGN_IN_S_FLAGS)
      sec_flags |= SEC_DEBUGGING;
#endif
    }
  else if (styp_flags & STYP_PAD)
    sec_flags = 0;
  else if (strcmp (name, _TEXT) == 0)
    {
      if (sec_flags & SEC_NEVER_LOAD)
        sec_flags |= SEC_CODE | SEC_COFF_SHARED_LIBRARY;
      else
        sec_flags |= SEC_CODE | SEC_LOAD | SEC_ALLOC;
    }
  else if (strcmp (name, _DATA) == 0)
    {
      if (sec_flags & SEC_NEVER_LOAD)
        sec_flags |= SEC_DATA | SEC_COFF_SHARED_LIBRARY;
      else
        sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC;
    }
  else if (strcmp (name, _BSS) == 0)
    {
#ifdef BSS_NOLOAD_IS_SHARED_LIBRARY
      if (sec_flags & SEC_NEVER_LOAD)
        sec_flags |= SEC_ALLOC | SEC_COFF_SHARED_LIBRARY;
      else
#endif
        sec_flags |= SEC_ALLOC;
    }
  else if (CONST_STRNEQ (name, DOT_DEBUG)
#ifdef _COMMENT
           || strcmp (name, _COMMENT) == 0
#endif
#ifdef COFF_LONG_SECTION_NAMES
           || CONST_STRNEQ (name, GNU_LINKONCE_WI)
#endif
           || CONST_STRNEQ (name, ".stab"))
    {
#ifdef COFF_PAGE_SIZE
      sec_flags |= SEC_DEBUGGING;
#endif
    }
#ifdef _LIB
  else if (strcmp (name, _LIB) == 0)
    ;
#endif
#ifdef _LIT
  else if (strcmp (name, _LIT) == 0)
    sec_flags = SEC_LOAD | SEC_ALLOC | SEC_READONLY;
#endif
  else
    sec_flags |= SEC_ALLOC | SEC_LOAD;

#ifdef STYP_LIT                 /* A29k readonly text/data section type.  */
  if ((styp_flags & STYP_LIT) == STYP_LIT)
    sec_flags = (SEC_LOAD | SEC_ALLOC | SEC_READONLY);
#endif /* STYP_LIT */

#ifdef STYP_OTHER_LOAD          /* Other loaded sections.  */
  if (styp_flags & STYP_OTHER_LOAD)
    sec_flags = (SEC_LOAD | SEC_ALLOC);
#endif /* STYP_SDATA */

#if defined (COFF_LONG_SECTION_NAMES) && defined (COFF_SUPPORT_GNU_LINKONCE)
  /* As a GNU extension, if the name begins with .gnu.linkonce, we
     only link a single copy of the section.  This is used to support
     g++.  g++ will emit each template expansion in its own section.
     The symbols will be defined as weak, so that multiple definitions
     are permitted.  The GNU linker extension is to actually discard
     all but one of the sections.  */
  if (CONST_STRNEQ (name, ".gnu.linkonce"))
    sec_flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
#endif

  if (flags_ptr == NULL)
    return FALSE;

  * flags_ptr = sec_flags;
  return TRUE;
}

#else /* COFF_WITH_PE */

static flagword
handle_COMDAT (bfd * abfd,
               flagword sec_flags,
               void * hdr,
               const char *name,
               asection *section)
{
  struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;
  bfd_byte *esymstart, *esym, *esymend;
  int seen_state = 0;
  char *target_name = NULL;

  sec_flags |= SEC_LINK_ONCE;

  /* Unfortunately, the PE format stores essential information in
     the symbol table, of all places.  We need to extract that
     information now, so that objdump and the linker will know how
     to handle the section without worrying about the symbols.  We
     can't call slurp_symtab, because the linker doesn't want the
     swapped symbols.  */

  /* COMDAT sections are special.  The first symbol is the section
     symbol, which tells what kind of COMDAT section it is.  The
     second symbol is the "comdat symbol" - the one with the
     unique name.  GNU uses the section symbol for the unique
     name; MS uses ".text" for every comdat section.  Sigh.  - DJ */

  /* This is not mirrored in sec_to_styp_flags(), but there
     doesn't seem to be a need to, either, and it would at best be
     rather messy.  */

  if (! _bfd_coff_get_external_symbols (abfd))
    return sec_flags;

  esymstart = esym = (bfd_byte *) obj_coff_external_syms (abfd);
  esymend = esym + obj_raw_syment_count (abfd) * bfd_coff_symesz (abfd);

  while (esym < esymend)
    {
      struct internal_syment isym;
      char buf[SYMNMLEN + 1];
      const char *symname;

      bfd_coff_swap_sym_in (abfd, esym, & isym);

      if (sizeof (internal_s->s_name) > SYMNMLEN)
        {
          /* This case implies that the matching
             symbol name will be in the string table.  */
          abort ();
        }

      if (isym.n_scnum == section->target_index)
        {
          /* According to the MSVC documentation, the first
             TWO entries with the section # are both of
             interest to us.  The first one is the "section
             symbol" (section name).  The second is the comdat
             symbol name.  Here, we've found the first
             qualifying entry; we distinguish it from the
             second with a state flag.

             In the case of gas-generated (at least until that
             is fixed) .o files, it isn't necessarily the
             second one.  It may be some other later symbol.

             Since gas also doesn't follow MS conventions and
             emits the section similar to .text$<name>, where
             <something> is the name we're looking for, we
             distinguish the two as follows:

             If the section name is simply a section name (no
             $) we presume it's MS-generated, and look at
             precisely the second symbol for the comdat name.
             If the section name has a $, we assume it's
             gas-generated, and look for <something> (whatever
             follows the $) as the comdat symbol.  */

          /* All 3 branches use this.  */
          symname = _bfd_coff_internal_syment_name (abfd, &isym, buf);

          if (symname == NULL)
            abort ();

          switch (seen_state)
            {
            case 0:
              {
                /* The first time we've seen the symbol.  */
                union internal_auxent aux;

                /* If it isn't the stuff we're expecting, die;
                   The MS documentation is vague, but it
                   appears that the second entry serves BOTH
                   as the comdat symbol and the defining
                   symbol record (either C_STAT or C_EXT,
                   possibly with an aux entry with debug
                   information if it's a function.)  It
                   appears the only way to find the second one
                   is to count.  (On Intel, they appear to be
                   adjacent, but on Alpha, they have been
                   found separated.)

                   Here, we think we've found the first one,
                   but there's some checking we can do to be
                   sure.  */

                if (! ((isym.n_sclass == C_STAT
                        || isym.n_sclass == C_EXT)
                       && isym.n_type == T_NULL
                       && isym.n_value == 0))
                  abort ();

                /* FIXME LATER: MSVC generates section names
                   like .text for comdats.  Gas generates
                   names like .text$foo__Fv (in the case of a
                   function).  See comment above for more.  */

                if (isym.n_sclass == C_STAT && strcmp (name, symname) != 0)
                  _bfd_error_handler (_("%B: warning: COMDAT symbol '%s' does not match section name '%s'"),
                                      abfd, symname, name);

                seen_state = 1;

                /* This is the section symbol.  */
                bfd_coff_swap_aux_in (abfd, (esym + bfd_coff_symesz (abfd)),
                                      isym.n_type, isym.n_sclass,
                                      0, isym.n_numaux, & aux);

                target_name = strchr (name, '$');
                if (target_name != NULL)
                  {
                    /* Gas mode.  */
                    seen_state = 2;
                    /* Skip the `$'.  */
                    target_name += 1;
                  }

                /* FIXME: Microsoft uses NODUPLICATES and
                   ASSOCIATIVE, but gnu uses ANY and
                   SAME_SIZE.  Unfortunately, gnu doesn't do
                   the comdat symbols right.  So, until we can
                   fix it to do the right thing, we are
                   temporarily disabling comdats for the MS
                   types (they're used in DLLs and C++, but we
                   don't support *their* C++ libraries anyway
                   - DJ.  */

                /* Cygwin does not follow the MS style, and
                   uses ANY and SAME_SIZE where NODUPLICATES
                   and ASSOCIATIVE should be used.  For
                   Interix, we just do the right thing up
                   front.  */

                switch (aux.x_scn.x_comdat)
                  {
                  case IMAGE_COMDAT_SELECT_NODUPLICATES:
#ifdef STRICT_PE_FORMAT
                    sec_flags |= SEC_LINK_DUPLICATES_ONE_ONLY;
#else
                    sec_flags &= ~SEC_LINK_ONCE;
#endif
                    break;

                  case IMAGE_COMDAT_SELECT_ANY:
                    sec_flags |= SEC_LINK_DUPLICATES_DISCARD;
                    break;

                  case IMAGE_COMDAT_SELECT_SAME_SIZE:
                    sec_flags |= SEC_LINK_DUPLICATES_SAME_SIZE;
                    break;

                  case IMAGE_COMDAT_SELECT_EXACT_MATCH:
                    /* Not yet fully implemented ??? */
                    sec_flags |= SEC_LINK_DUPLICATES_SAME_CONTENTS;
                    break;

                    /* debug$S gets this case; other
                       implications ??? */

                    /* There may be no symbol... we'll search
                       the whole table... Is this the right
                       place to play this game? Or should we do
                       it when reading it in.  */
                  case IMAGE_COMDAT_SELECT_ASSOCIATIVE:
#ifdef STRICT_PE_FORMAT
                    /* FIXME: This is not currently implemented.  */
                    sec_flags |= SEC_LINK_DUPLICATES_DISCARD;
#else
                    sec_flags &= ~SEC_LINK_ONCE;
#endif
                    break;

                  default:  /* 0 means "no symbol" */
                    /* debug$F gets this case; other
                       implications ??? */
                    sec_flags |= SEC_LINK_DUPLICATES_DISCARD;
                    break;
                  }
              }
              break;

            case 2:
              /* Gas mode: the first matching on partial name.  */

#ifndef TARGET_UNDERSCORE
#define TARGET_UNDERSCORE 0
#endif
              /* Is this the name we're looking for ?  */
              if (strcmp (target_name,
                          symname + (TARGET_UNDERSCORE ? 1 : 0)) != 0)
                {
                  /* Not the name we're looking for */
                  esym += (isym.n_numaux + 1) * bfd_coff_symesz (abfd);
                  continue;
                }
              /* Fall through.  */
            case 1:
              /* MSVC mode: the lexically second symbol (or
                 drop through from the above).  */
              {
                char *newname;
                bfd_size_type amt;

                /* This must the second symbol with the
                   section #.  It is the actual symbol name.
                   Intel puts the two adjacent, but Alpha (at
                   least) spreads them out.  */

                amt = sizeof (struct coff_comdat_info);
                coff_section_data (abfd, section)->comdat
                  = bfd_alloc (abfd, amt);
                if (coff_section_data (abfd, section)->comdat == NULL)
                  abort ();

                coff_section_data (abfd, section)->comdat->symbol =
                  (esym - esymstart) / bfd_coff_symesz (abfd);

                amt = strlen (symname) + 1;
                newname = bfd_alloc (abfd, amt);
                if (newname == NULL)
                  abort ();

                strcpy (newname, symname);
                coff_section_data (abfd, section)->comdat->name
                  = newname;
              }

              goto breakloop;
            }
        }

      esym += (isym.n_numaux + 1) * bfd_coff_symesz (abfd);
    }

 breakloop:
  return sec_flags;
}


/* The PE version; see above for the general comments.

   Since to set the SEC_LINK_ONCE and associated flags, we have to
   look at the symbol table anyway, we return the symbol table index
   of the symbol being used as the COMDAT symbol.  This is admittedly
   ugly, but there's really nowhere else that we have access to the
   required information.  FIXME: Is the COMDAT symbol index used for
   any purpose other than objdump?  */

static bfd_boolean
styp_to_sec_flags (bfd *abfd,
                   void * hdr,
                   const char *name,
                   asection *section,
                   flagword *flags_ptr)
{
  struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;
  long styp_flags = internal_s->s_flags;
  flagword sec_flags;
  bfd_boolean result = TRUE;

  /* Assume read only unless IMAGE_SCN_MEM_WRITE is specified.  */
  sec_flags = SEC_READONLY;

  /* If section disallows read, then set the NOREAD flag. */
  if ((styp_flags & IMAGE_SCN_MEM_READ) == 0)
    sec_flags |= SEC_COFF_NOREAD;

  /* Process each flag bit in styp_flags in turn.  */
  while (styp_flags)
    {
      long flag = styp_flags & - styp_flags;
      char * unhandled = NULL;

      styp_flags &= ~ flag;

      /* We infer from the distinct read/write/execute bits the settings
         of some of the bfd flags; the actual values, should we need them,
         are also in pei_section_data (abfd, section)->pe_flags.  */

      switch (flag)
        {
        case STYP_DSECT:
          unhandled = "STYP_DSECT";
          break;
        case STYP_GROUP:
          unhandled = "STYP_GROUP";
          break;
        case STYP_COPY:
          unhandled = "STYP_COPY";
          break;
        case STYP_OVER:
          unhandled = "STYP_OVER";
          break;
#ifdef SEC_NEVER_LOAD
        case STYP_NOLOAD:
          sec_flags |= SEC_NEVER_LOAD;
          break;
#endif
        case IMAGE_SCN_MEM_READ:
          sec_flags &= ~SEC_COFF_NOREAD;
          break;
        case IMAGE_SCN_TYPE_NO_PAD:
          /* Skip.  */
          break;
        case IMAGE_SCN_LNK_OTHER:
          unhandled = "IMAGE_SCN_LNK_OTHER";
          break;
        case IMAGE_SCN_MEM_NOT_CACHED:
          unhandled = "IMAGE_SCN_MEM_NOT_CACHED";
          break;
        case IMAGE_SCN_MEM_NOT_PAGED:
          /* Generate a warning message rather using the 'unhandled'
             variable as this will allow some .sys files generate by
             other toolchains to be processed.  See bugzilla issue 196.  */
          _bfd_error_handler (_("%B: Warning: Ignoring section flag IMAGE_SCN_MEM_NOT_PAGED in section %s"),
                              abfd, name);
          break;
        case IMAGE_SCN_MEM_EXECUTE:
          sec_flags |= SEC_CODE;
          break;
        case IMAGE_SCN_MEM_WRITE:
          sec_flags &= ~ SEC_READONLY;
          break;
        case IMAGE_SCN_MEM_DISCARDABLE:
          /* The MS PE spec says that debug sections are DISCARDABLE,
             but the presence of a DISCARDABLE flag does not necessarily
             mean that a given section contains debug information.  Thus
             we only set the SEC_DEBUGGING flag on sections that we
             recognise as containing debug information.  */
             if (CONST_STRNEQ (name, DOT_DEBUG)
#ifdef _COMMENT
              || strcmp (name, _COMMENT) == 0
#endif
#ifdef COFF_LONG_SECTION_NAMES
              || CONST_STRNEQ (name, GNU_LINKONCE_WI)
#endif
              || CONST_STRNEQ (name, ".stab"))
            sec_flags |= SEC_DEBUGGING;
          break;
        case IMAGE_SCN_MEM_SHARED:
          sec_flags |= SEC_COFF_SHARED;
          break;
        case IMAGE_SCN_LNK_REMOVE:
          sec_flags |= SEC_EXCLUDE;
          break;
        case IMAGE_SCN_CNT_CODE:
          sec_flags |= SEC_CODE | SEC_ALLOC | SEC_LOAD;
          break;
        case IMAGE_SCN_CNT_INITIALIZED_DATA:
          sec_flags |= SEC_DATA | SEC_ALLOC | SEC_LOAD;
          break;
        case IMAGE_SCN_CNT_UNINITIALIZED_DATA:
          sec_flags |= SEC_ALLOC;
          break;
        case IMAGE_SCN_LNK_INFO:
          /* We mark these as SEC_DEBUGGING, but only if COFF_PAGE_SIZE is
             defined.  coff_compute_section_file_positions uses
             COFF_PAGE_SIZE to ensure that the low order bits of the
             section VMA and the file offset match.  If we don't know
             COFF_PAGE_SIZE, we can't ensure the correct correspondence,
             and demand page loading of the file will fail.  */
#ifdef COFF_PAGE_SIZE
          sec_flags |= SEC_DEBUGGING;
#endif
          break;
        case IMAGE_SCN_LNK_COMDAT:
          /* COMDAT gets very special treatment.  */
          sec_flags = handle_COMDAT (abfd, sec_flags, hdr, name, section);
          break;
        default:
          /* Silently ignore for now.  */
          break;
        }

      /* If the section flag was not handled, report it here.  */
      if (unhandled != NULL)
        {
          (*_bfd_error_handler)
            (_("%B (%s): Section flag %s (0x%x) ignored"),
             abfd, name, unhandled, flag);
          result = FALSE;
        }
    }

#if defined (COFF_LONG_SECTION_NAMES) && defined (COFF_SUPPORT_GNU_LINKONCE)
  /* As a GNU extension, if the name begins with .gnu.linkonce, we
     only link a single copy of the section.  This is used to support
     g++.  g++ will emit each template expansion in its own section.
     The symbols will be defined as weak, so that multiple definitions
     are permitted.  The GNU linker extension is to actually discard
     all but one of the sections.  */
  if (CONST_STRNEQ (name, ".gnu.linkonce"))
    sec_flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD;
#endif

  if (flags_ptr)
    * flags_ptr = sec_flags;

  return result;
}

#endif /* COFF_WITH_PE */

#define get_index(symbol)       ((symbol)->udata.i)

/*
INTERNAL_DEFINITION
        bfd_coff_backend_data

CODE_FRAGMENT

.{* COFF symbol classifications.  *}
.
.enum coff_symbol_classification
.{
.  {* Global symbol.  *}
.  COFF_SYMBOL_GLOBAL,
.  {* Common symbol.  *}
.  COFF_SYMBOL_COMMON,
.  {* Undefined symbol.  *}
.  COFF_SYMBOL_UNDEFINED,
.  {* Local symbol.  *}
.  COFF_SYMBOL_LOCAL,
.  {* PE section symbol.  *}
.  COFF_SYMBOL_PE_SECTION
.};
.
Special entry points for gdb to swap in coff symbol table parts:
.typedef struct
.{
.  void (*_bfd_coff_swap_aux_in)
.    (bfd *, void *, int, int, int, int, void *);
.
.  void (*_bfd_coff_swap_sym_in)
.    (bfd *, void *, void *);
.
.  void (*_bfd_coff_swap_lineno_in)
.    (bfd *, void *, void *);
.
.  unsigned int (*_bfd_coff_swap_aux_out)
.    (bfd *, void *, int, int, int, int, void *);
.
.  unsigned int (*_bfd_coff_swap_sym_out)
.    (bfd *, void *, void *);
.
.  unsigned int (*_bfd_coff_swap_lineno_out)
.    (bfd *, void *, void *);
.
.  unsigned int (*_bfd_coff_swap_reloc_out)
.    (bfd *, void *, void *);
.
.  unsigned int (*_bfd_coff_swap_filehdr_out)
.    (bfd *, void *, void *);
.
.  unsigned int (*_bfd_coff_swap_aouthdr_out)
.    (bfd *, void *, void *);
.
.  unsigned int (*_bfd_coff_swap_scnhdr_out)
.    (bfd *, void *, void *);
.
.  unsigned int _bfd_filhsz;
.  unsigned int _bfd_aoutsz;
.  unsigned int _bfd_scnhsz;
.  unsigned int _bfd_symesz;
.  unsigned int _bfd_auxesz;
.  unsigned int _bfd_relsz;
.  unsigned int _bfd_linesz;
.  unsigned int _bfd_filnmlen;
.  bfd_boolean _bfd_coff_long_filenames;
.
.  bfd_boolean _bfd_coff_long_section_names;
.  bfd_boolean (*_bfd_coff_set_long_section_names)
.    (bfd *, int);
.  
.  unsigned int _bfd_coff_default_section_alignment_power;
.  bfd_boolean _bfd_coff_force_symnames_in_strings;
.  unsigned int _bfd_coff_debug_string_prefix_length;
.
.  void (*_bfd_coff_swap_filehdr_in)
.    (bfd *, void *, void *);
.
.  void (*_bfd_coff_swap_aouthdr_in)
.    (bfd *, void *, void *);
.
.  void (*_bfd_coff_swap_scnhdr_in)
.    (bfd *, void *, void *);
.
.  void (*_bfd_coff_swap_reloc_in)
.    (bfd *abfd, void *, void *);
.
.  bfd_boolean (*_bfd_coff_bad_format_hook)
.    (bfd *, void *);
.
.  bfd_boolean (*_bfd_coff_set_arch_mach_hook)
.    (bfd *, void *);
.
.  void * (*_bfd_coff_mkobject_hook)
.    (bfd *, void *, void *);
.
.  bfd_boolean (*_bfd_styp_to_sec_flags_hook)
.    (bfd *, void *, const char *, asection *, flagword *);
.
.  void (*_bfd_set_alignment_hook)
.    (bfd *, asection *, void *);
.
.  bfd_boolean (*_bfd_coff_slurp_symbol_table)
.    (bfd *);
.
.  bfd_boolean (*_bfd_coff_symname_in_debug)
.    (bfd *, struct internal_syment *);
.
.  bfd_boolean (*_bfd_coff_pointerize_aux_hook)
.    (bfd *, combined_entry_type *, combined_entry_type *,
.            unsigned int, combined_entry_type *);
.
.  bfd_boolean (*_bfd_coff_print_aux)
.    (bfd *, FILE *, combined_entry_type *, combined_entry_type *,
.            combined_entry_type *, unsigned int);
.
.  void (*_bfd_coff_reloc16_extra_cases)
.    (bfd *, struct bfd_link_info *, struct bfd_link_order *, arelent *,
.           bfd_byte *, unsigned int *, unsigned int *);
.
.  int (*_bfd_coff_reloc16_estimate)
.    (bfd *, asection *, arelent *, unsigned int,
.            struct bfd_link_info *);
.
.  enum coff_symbol_classification (*_bfd_coff_classify_symbol)
.    (bfd *, struct internal_syment *);
.
.  bfd_boolean (*_bfd_coff_compute_section_file_positions)
.    (bfd *);
.
.  bfd_boolean (*_bfd_coff_start_final_link)
.    (bfd *, struct bfd_link_info *);
.
.  bfd_boolean (*_bfd_coff_relocate_section)
.    (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
.            struct internal_reloc *, struct internal_syment *, asection **);
.
.  reloc_howto_type *(*_bfd_coff_rtype_to_howto)
.    (bfd *, asection *, struct internal_reloc *,
.            struct coff_link_hash_entry *, struct internal_syment *,
.            bfd_vma *);
.
.  bfd_boolean (*_bfd_coff_adjust_symndx)
.    (bfd *, struct bfd_link_info *, bfd *, asection *,
.            struct internal_reloc *, bfd_boolean *);
.
.  bfd_boolean (*_bfd_coff_link_add_one_symbol)
.    (struct bfd_link_info *, bfd *, const char *, flagword,
.            asection *, bfd_vma, const char *, bfd_boolean, bfd_boolean,
.            struct bfd_link_hash_entry **);
.
.  bfd_boolean (*_bfd_coff_link_output_has_begun)
.    (bfd *, struct coff_final_link_info *);
.
.  bfd_boolean (*_bfd_coff_final_link_postscript)
.    (bfd *, struct coff_final_link_info *);
.
.  bfd_boolean (*_bfd_coff_print_pdata)
.    (bfd *, void *);
.
.} bfd_coff_backend_data;
.
.#define coff_backend_info(abfd) \
.  ((bfd_coff_backend_data *) (abfd)->xvec->backend_data)
.
.#define bfd_coff_swap_aux_in(a,e,t,c,ind,num,i) \
.  ((coff_backend_info (a)->_bfd_coff_swap_aux_in) (a,e,t,c,ind,num,i))
.
.#define bfd_coff_swap_sym_in(a,e,i) \
.  ((coff_backend_info (a)->_bfd_coff_swap_sym_in) (a,e,i))
.
.#define bfd_coff_swap_lineno_in(a,e,i) \
.  ((coff_backend_info ( a)->_bfd_coff_swap_lineno_in) (a,e,i))
.
.#define bfd_coff_swap_reloc_out(abfd, i, o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_reloc_out) (abfd, i, o))
.
.#define bfd_coff_swap_lineno_out(abfd, i, o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_lineno_out) (abfd, i, o))
.
.#define bfd_coff_swap_aux_out(a,i,t,c,ind,num,o) \
.  ((coff_backend_info (a)->_bfd_coff_swap_aux_out) (a,i,t,c,ind,num,o))
.
.#define bfd_coff_swap_sym_out(abfd, i,o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_sym_out) (abfd, i, o))
.
.#define bfd_coff_swap_scnhdr_out(abfd, i,o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_out) (abfd, i, o))
.
.#define bfd_coff_swap_filehdr_out(abfd, i,o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_out) (abfd, i, o))
.
.#define bfd_coff_swap_aouthdr_out(abfd, i,o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_out) (abfd, i, o))
.
.#define bfd_coff_filhsz(abfd) (coff_backend_info (abfd)->_bfd_filhsz)
.#define bfd_coff_aoutsz(abfd) (coff_backend_info (abfd)->_bfd_aoutsz)
.#define bfd_coff_scnhsz(abfd) (coff_backend_info (abfd)->_bfd_scnhsz)
.#define bfd_coff_symesz(abfd) (coff_backend_info (abfd)->_bfd_symesz)
.#define bfd_coff_auxesz(abfd) (coff_backend_info (abfd)->_bfd_auxesz)
.#define bfd_coff_relsz(abfd)  (coff_backend_info (abfd)->_bfd_relsz)
.#define bfd_coff_linesz(abfd) (coff_backend_info (abfd)->_bfd_linesz)
.#define bfd_coff_filnmlen(abfd) (coff_backend_info (abfd)->_bfd_filnmlen)
.#define bfd_coff_long_filenames(abfd) \
.  (coff_backend_info (abfd)->_bfd_coff_long_filenames)
.#define bfd_coff_long_section_names(abfd) \
.  (coff_backend_info (abfd)->_bfd_coff_long_section_names)
.#define bfd_coff_set_long_section_names(abfd, enable) \
.  ((coff_backend_info (abfd)->_bfd_coff_set_long_section_names) (abfd, enable))
.#define bfd_coff_default_section_alignment_power(abfd) \
.  (coff_backend_info (abfd)->_bfd_coff_default_section_alignment_power)
.#define bfd_coff_swap_filehdr_in(abfd, i,o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_filehdr_in) (abfd, i, o))
.
.#define bfd_coff_swap_aouthdr_in(abfd, i,o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_aouthdr_in) (abfd, i, o))
.
.#define bfd_coff_swap_scnhdr_in(abfd, i,o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_scnhdr_in) (abfd, i, o))
.
.#define bfd_coff_swap_reloc_in(abfd, i, o) \
.  ((coff_backend_info (abfd)->_bfd_coff_swap_reloc_in) (abfd, i, o))
.
.#define bfd_coff_bad_format_hook(abfd, filehdr) \
.  ((coff_backend_info (abfd)->_bfd_coff_bad_format_hook) (abfd, filehdr))
.
.#define bfd_coff_set_arch_mach_hook(abfd, filehdr)\
.  ((coff_backend_info (abfd)->_bfd_coff_set_arch_mach_hook) (abfd, filehdr))
.#define bfd_coff_mkobject_hook(abfd, filehdr, aouthdr)\
.  ((coff_backend_info (abfd)->_bfd_coff_mkobject_hook)\
.   (abfd, filehdr, aouthdr))
.
.#define bfd_coff_styp_to_sec_flags_hook(abfd, scnhdr, name, section, flags_ptr)\
.  ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook)\
.   (abfd, scnhdr, name, section, flags_ptr))
.
.#define bfd_coff_set_alignment_hook(abfd, sec, scnhdr)\
.  ((coff_backend_info (abfd)->_bfd_set_alignment_hook) (abfd, sec, scnhdr))
.
.#define bfd_coff_slurp_symbol_table(abfd)\
.  ((coff_backend_info (abfd)->_bfd_coff_slurp_symbol_table) (abfd))
.
.#define bfd_coff_symname_in_debug(abfd, sym)\
.  ((coff_backend_info (abfd)->_bfd_coff_symname_in_debug) (abfd, sym))
.
.#define bfd_coff_force_symnames_in_strings(abfd)\
.  (coff_backend_info (abfd)->_bfd_coff_force_symnames_in_strings)
.
.#define bfd_coff_debug_string_prefix_length(abfd)\
.  (coff_backend_info (abfd)->_bfd_coff_debug_string_prefix_length)
.
.#define bfd_coff_print_aux(abfd, file, base, symbol, aux, indaux)\
.  ((coff_backend_info (abfd)->_bfd_coff_print_aux)\
.   (abfd, file, base, symbol, aux, indaux))
.
.#define bfd_coff_reloc16_extra_cases(abfd, link_info, link_order,\
.                                     reloc, data, src_ptr, dst_ptr)\
.  ((coff_backend_info (abfd)->_bfd_coff_reloc16_extra_cases)\
.   (abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr))
.
.#define bfd_coff_reloc16_estimate(abfd, section, reloc, shrink, link_info)\
.  ((coff_backend_info (abfd)->_bfd_coff_reloc16_estimate)\
.   (abfd, section, reloc, shrink, link_info))
.
.#define bfd_coff_classify_symbol(abfd, sym)\
.  ((coff_backend_info (abfd)->_bfd_coff_classify_symbol)\
.   (abfd, sym))
.
.#define bfd_coff_compute_section_file_positions(abfd)\
.  ((coff_backend_info (abfd)->_bfd_coff_compute_section_file_positions)\
.   (abfd))
.
.#define bfd_coff_start_final_link(obfd, info)\
.  ((coff_backend_info (obfd)->_bfd_coff_start_final_link)\
.   (obfd, info))
.#define bfd_coff_relocate_section(obfd,info,ibfd,o,con,rel,isyms,secs)\
.  ((coff_backend_info (ibfd)->_bfd_coff_relocate_section)\
.   (obfd, info, ibfd, o, con, rel, isyms, secs))
.#define bfd_coff_rtype_to_howto(abfd, sec, rel, h, sym, addendp)\
.  ((coff_backend_info (abfd)->_bfd_coff_rtype_to_howto)\
.   (abfd, sec, rel, h, sym, addendp))
.#define bfd_coff_adjust_symndx(obfd, info, ibfd, sec, rel, adjustedp)\
.  ((coff_backend_info (abfd)->_bfd_coff_adjust_symndx)\
.   (obfd, info, ibfd, sec, rel, adjustedp))
.#define bfd_coff_link_add_one_symbol(info, abfd, name, flags, section,\
.                                     value, string, cp, coll, hashp)\
.  ((coff_backend_info (abfd)->_bfd_coff_link_add_one_symbol)\
.   (info, abfd, name, flags, section, value, string, cp, coll, hashp))
.
.#define bfd_coff_link_output_has_begun(a,p) \
.  ((coff_backend_info (a)->_bfd_coff_link_output_has_begun) (a, p))
.#define bfd_coff_final_link_postscript(a,p) \
.  ((coff_backend_info (a)->_bfd_coff_final_link_postscript) (a, p))
.
.#define bfd_coff_have_print_pdata(a) \
.  (coff_backend_info (a)->_bfd_coff_print_pdata)
.#define bfd_coff_print_pdata(a,p) \
.  ((coff_backend_info (a)->_bfd_coff_print_pdata) (a, p))
.
.{* Macro: Returns true if the bfd is a PE executable as opposed to a
.   PE object file.  *}
.#define bfd_pei_p(abfd) \
.  (CONST_STRNEQ ((abfd)->xvec->name, "pei-"))
*/

/* See whether the magic number matches.  */

static bfd_boolean
coff_bad_format_hook (bfd * abfd ATTRIBUTE_UNUSED, void * filehdr)
{
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;

  if (BADMAG (*internal_f))
    return FALSE;

  /* If the optional header is NULL or not the correct size then
     quit; the only difference I can see between m88k dgux headers (MC88DMAGIC)
     and Intel 960 readwrite headers (I960WRMAGIC) is that the
     optional header is of a different size.

     But the mips keeps extra stuff in it's opthdr, so dont check
     when doing that.  */

#if defined(M88) || defined(I960)
  if (internal_f->f_opthdr != 0 && bfd_coff_aoutsz (abfd) != internal_f->f_opthdr)
    return FALSE;
#endif

  return TRUE;
}

#ifdef TICOFF
static bfd_boolean
ticoff0_bad_format_hook (bfd *abfd ATTRIBUTE_UNUSED, void * filehdr)
{
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;

  if (COFF0_BADMAG (*internal_f))
    return FALSE;

  return TRUE;
}
#endif

#ifdef TICOFF
static bfd_boolean
ticoff1_bad_format_hook (bfd *abfd ATTRIBUTE_UNUSED, void * filehdr)
{
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;

  if (COFF1_BADMAG (*internal_f))
    return FALSE;

  return TRUE;
}
#endif

/* Check whether this section uses an alignment other than the
   default.  */

static void
coff_set_custom_section_alignment (bfd *abfd ATTRIBUTE_UNUSED,
                                   asection *section,
                                   const struct coff_section_alignment_entry *alignment_table,
                                   const unsigned int table_size)
{
  const unsigned int default_alignment = COFF_DEFAULT_SECTION_ALIGNMENT_POWER;
  unsigned int i;

  for (i = 0; i < table_size; ++i)
    {
      const char *secname = bfd_get_section_name (abfd, section);

      if (alignment_table[i].comparison_length == (unsigned int) -1
          ? strcmp (alignment_table[i].name, secname) == 0
          : strncmp (alignment_table[i].name, secname,
                     alignment_table[i].comparison_length) == 0)
        break;
    }
  if (i >= table_size)
    return;

  if (alignment_table[i].default_alignment_min != COFF_ALIGNMENT_FIELD_EMPTY
      && default_alignment < alignment_table[i].default_alignment_min)
    return;

  if (alignment_table[i].default_alignment_max != COFF_ALIGNMENT_FIELD_EMPTY
#if COFF_DEFAULT_SECTION_ALIGNMENT_POWER != 0
      && default_alignment > alignment_table[i].default_alignment_max
#endif
      )
    return;

  section->alignment_power = alignment_table[i].alignment_power;
}

/* Custom section alignment records.  */

static const struct coff_section_alignment_entry
coff_section_alignment_table[] =
{
#ifdef COFF_SECTION_ALIGNMENT_ENTRIES
  COFF_SECTION_ALIGNMENT_ENTRIES,
#endif
  /* There must not be any gaps between .stabstr sections.  */
  { COFF_SECTION_NAME_PARTIAL_MATCH (".stabstr"),
    1, COFF_ALIGNMENT_FIELD_EMPTY, 0 },
  /* The .stab section must be aligned to 2**2 at most, to avoid gaps.  */
  { COFF_SECTION_NAME_PARTIAL_MATCH (".stab"),
    3, COFF_ALIGNMENT_FIELD_EMPTY, 2 },
  /* Similarly for the .ctors and .dtors sections.  */
  { COFF_SECTION_NAME_EXACT_MATCH (".ctors"),
    3, COFF_ALIGNMENT_FIELD_EMPTY, 2 },
  { COFF_SECTION_NAME_EXACT_MATCH (".dtors"),
    3, COFF_ALIGNMENT_FIELD_EMPTY, 2 }
};

static const unsigned int coff_section_alignment_table_size =
  sizeof coff_section_alignment_table / sizeof coff_section_alignment_table[0];

/* Initialize a section structure with information peculiar to this
   particular implementation of COFF.  */

static bfd_boolean
coff_new_section_hook (bfd * abfd, asection * section)
{
  combined_entry_type *native;
  bfd_size_type amt;

  section->alignment_power = COFF_DEFAULT_SECTION_ALIGNMENT_POWER;

#ifdef RS6000COFF_C
  if (bfd_xcoff_text_align_power (abfd) != 0
      && strcmp (bfd_get_section_name (abfd, section), ".text") == 0)
    section->alignment_power = bfd_xcoff_text_align_power (abfd);
  if (bfd_xcoff_data_align_power (abfd) != 0
      && strcmp (bfd_get_section_name (abfd, section), ".data") == 0)
    section->alignment_power = bfd_xcoff_data_align_power (abfd);
#endif

  /* Set up the section symbol.  */
  if (!_bfd_generic_new_section_hook (abfd, section))
    return FALSE;

  /* Allocate aux records for section symbols, to store size and
     related info.

     @@ The 10 is a guess at a plausible maximum number of aux entries
     (but shouldn't be a constant).  */
  amt = sizeof (combined_entry_type) * 10;
  native = bfd_zalloc (abfd, amt);
  if (native == NULL)
    return FALSE;

  /* We don't need to set up n_name, n_value, or n_scnum in the native
     symbol information, since they'll be overridden by the BFD symbol
     anyhow.  However, we do need to set the type and storage class,
     in case this symbol winds up getting written out.  The value 0
     for n_numaux is already correct.  */

  native->u.syment.n_type = T_NULL;
  native->u.syment.n_sclass = C_STAT;

  coffsymbol (section->symbol)->native = native;

  coff_set_custom_section_alignment (abfd, section,
                                     coff_section_alignment_table,
                                     coff_section_alignment_table_size);

  return TRUE;
}

#ifdef COFF_ALIGN_IN_SECTION_HEADER

/* Set the alignment of a BFD section.  */

static void
coff_set_alignment_hook (bfd * abfd ATTRIBUTE_UNUSED,
                         asection * section,
                         void * scnhdr)
{
  struct internal_scnhdr *hdr = (struct internal_scnhdr *) scnhdr;
  unsigned int i;

#ifdef I960
  /* Extract ALIGN from 2**ALIGN stored in section header.  */
  for (i = 0; i < 32; i++)
    if ((1 << i) >= hdr->s_align)
      break;
#endif
#ifdef TIC80COFF
  /* TI tools puts the alignment power in bits 8-11.  */
  i = (hdr->s_flags >> 8) & 0xF ;
#endif
#ifdef COFF_DECODE_ALIGNMENT
  i = COFF_DECODE_ALIGNMENT(hdr->s_flags);
#endif
  section->alignment_power = i;

#ifdef coff_set_section_load_page
  coff_set_section_load_page (section, hdr->s_page);
#endif
}

#else /* ! COFF_ALIGN_IN_SECTION_HEADER */
#ifdef COFF_WITH_PE

static void
coff_set_alignment_hook (bfd * abfd ATTRIBUTE_UNUSED,
                         asection * section,
                         void * scnhdr)
{
  struct internal_scnhdr *hdr = (struct internal_scnhdr *) scnhdr;
  bfd_size_type amt;
  unsigned int alignment_power_const
    = hdr->s_flags & IMAGE_SCN_ALIGN_POWER_BIT_MASK;

  switch (alignment_power_const)
    {
    case IMAGE_SCN_ALIGN_8192BYTES:
    case IMAGE_SCN_ALIGN_4096BYTES:
    case IMAGE_SCN_ALIGN_2048BYTES:
    case IMAGE_SCN_ALIGN_1024BYTES:
    case IMAGE_SCN_ALIGN_512BYTES:
    case IMAGE_SCN_ALIGN_256BYTES:
    case IMAGE_SCN_ALIGN_128BYTES:
    case IMAGE_SCN_ALIGN_64BYTES:
    case IMAGE_SCN_ALIGN_32BYTES:
    case IMAGE_SCN_ALIGN_16BYTES:
    case IMAGE_SCN_ALIGN_8BYTES:
    case IMAGE_SCN_ALIGN_4BYTES:
    case IMAGE_SCN_ALIGN_2BYTES:
    case IMAGE_SCN_ALIGN_1BYTES:
      section->alignment_power
        = IMAGE_SCN_ALIGN_POWER_NUM (alignment_power_const);
      break;
    default:
      break;
    }

  /* In a PE image file, the s_paddr field holds the virtual size of a
     section, while the s_size field holds the raw size.  We also keep
     the original section flag value, since not every bit can be
     mapped onto a generic BFD section bit.  */
  if (coff_section_data (abfd, section) == NULL)
    {
      amt = sizeof (struct coff_section_tdata);
      section->used_by_bfd = bfd_zalloc (abfd, amt);
      if (section->used_by_bfd == NULL)
        /* FIXME: Return error.  */
        abort ();
    }

  if (pei_section_data (abfd, section) == NULL)
    {
      amt = sizeof (struct pei_section_tdata);
      coff_section_data (abfd, section)->tdata = bfd_zalloc (abfd, amt);
      if (coff_section_data (abfd, section)->tdata == NULL)
        /* FIXME: Return error.  */
        abort ();
    }
  pei_section_data (abfd, section)->virt_size = hdr->s_paddr;
  pei_section_data (abfd, section)->pe_flags = hdr->s_flags;

  section->lma = hdr->s_vaddr;

  /* Check for extended relocs.  */
  if (hdr->s_flags & IMAGE_SCN_LNK_NRELOC_OVFL)
    {
      struct external_reloc dst;
      struct internal_reloc n;
      file_ptr oldpos = bfd_tell (abfd);
      bfd_size_type relsz = bfd_coff_relsz (abfd);

      bfd_seek (abfd, (file_ptr) hdr->s_relptr, 0);
      if (bfd_bread (& dst, relsz, abfd) != relsz)
        return;

      coff_swap_reloc_in (abfd, &dst, &n);
      bfd_seek (abfd, oldpos, 0);
      section->reloc_count = hdr->s_nreloc = n.r_vaddr - 1;
      section->rel_filepos += relsz;
    }
  else if (hdr->s_nreloc == 0xffff)
    (*_bfd_error_handler)
      ("%s: warning: claims to have 0xffff relocs, without overflow",
       bfd_get_filename (abfd));
}
#undef ALIGN_SET
#undef ELIFALIGN_SET

#else /* ! COFF_WITH_PE */
#ifdef RS6000COFF_C

/* We grossly abuse this function to handle XCOFF overflow headers.
   When we see one, we correct the reloc and line number counts in the
   real header, and remove the section we just created.  */

static void
coff_set_alignment_hook (bfd *abfd, asection *section, void * scnhdr)
{
  struct internal_scnhdr *hdr = (struct internal_scnhdr *) scnhdr;
  asection *real_sec;

  if ((hdr->s_flags & STYP_OVRFLO) == 0)
    return;

  real_sec = coff_section_from_bfd_index (abfd, (int) hdr->s_nreloc);
  if (real_sec == NULL)
    return;

  real_sec->reloc_count = hdr->s_paddr;
  real_sec->lineno_count = hdr->s_vaddr;

  if (!bfd_section_removed_from_list (abfd, section))
    {
      bfd_section_list_remove (abfd, section);
      --abfd->section_count;
    }
}

#else /* ! RS6000COFF_C */

#define coff_set_alignment_hook \
  ((void (*) (bfd *, asection *, void *)) bfd_void)

#endif /* ! RS6000COFF_C */
#endif /* ! COFF_WITH_PE */
#endif /* ! COFF_ALIGN_IN_SECTION_HEADER */

#ifndef coff_mkobject

static bfd_boolean
coff_mkobject (bfd * abfd)
{
  coff_data_type *coff;
  bfd_size_type amt = sizeof (coff_data_type);

  abfd->tdata.coff_obj_data = bfd_zalloc (abfd, amt);
  if (abfd->tdata.coff_obj_data == NULL)
    return FALSE;
  coff = coff_data (abfd);
  coff->symbols = NULL;
  coff->conversion_table = NULL;
  coff->raw_syments = NULL;
  coff->relocbase = 0;
  coff->local_toc_sym_map = 0;

/*  make_abs_section(abfd);*/

  return TRUE;
}
#endif

/* Create the COFF backend specific information.  */

#ifndef coff_mkobject_hook
static void *
coff_mkobject_hook (bfd * abfd,
                    void * filehdr,
                    void * aouthdr ATTRIBUTE_UNUSED)
{
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
  coff_data_type *coff;

  if (! coff_mkobject (abfd))
    return NULL;

  coff = coff_data (abfd);

  coff->sym_filepos = internal_f->f_symptr;

  /* These members communicate important constants about the symbol
     table to GDB's symbol-reading code.  These `constants'
     unfortunately vary among coff implementations...  */
  coff->local_n_btmask = N_BTMASK;
  coff->local_n_btshft = N_BTSHFT;
  coff->local_n_tmask = N_TMASK;
  coff->local_n_tshift = N_TSHIFT;
  coff->local_symesz = bfd_coff_symesz (abfd);
  coff->local_auxesz = bfd_coff_auxesz (abfd);
  coff->local_linesz = bfd_coff_linesz (abfd);

  coff->timestamp = internal_f->f_timdat;

  obj_raw_syment_count (abfd) =
    obj_conv_table_size (abfd) =
      internal_f->f_nsyms;

#ifdef RS6000COFF_C
  if ((internal_f->f_flags & F_SHROBJ) != 0)
    abfd->flags |= DYNAMIC;
  if (aouthdr != NULL && internal_f->f_opthdr >= bfd_coff_aoutsz (abfd))
    {
      struct internal_aouthdr *internal_a =
        (struct internal_aouthdr *) aouthdr;
      struct xcoff_tdata *xcoff;

      xcoff = xcoff_data (abfd);
# ifdef U803XTOCMAGIC
      xcoff->xcoff64 = internal_f->f_magic == U803XTOCMAGIC;
# else
      xcoff->xcoff64 = 0;
# endif
      xcoff->full_aouthdr = TRUE;
      xcoff->toc = internal_a->o_toc;
      xcoff->sntoc = internal_a->o_sntoc;
      xcoff->snentry = internal_a->o_snentry;
      bfd_xcoff_text_align_power (abfd) = internal_a->o_algntext;
      bfd_xcoff_data_align_power (abfd) = internal_a->o_algndata;
      xcoff->modtype = internal_a->o_modtype;
      xcoff->cputype = internal_a->o_cputype;
      xcoff->maxdata = internal_a->o_maxdata;
      xcoff->maxstack = internal_a->o_maxstack;
    }
#endif

#ifdef ARM
  /* Set the flags field from the COFF header read in.  */
  if (! _bfd_coff_arm_set_private_flags (abfd, internal_f->f_flags))
    coff->flags = 0;
#endif

#ifdef COFF_WITH_PE
  /* FIXME: I'm not sure this is ever executed, since peicode.h
     defines coff_mkobject_hook.  */
  if ((internal_f->f_flags & IMAGE_FILE_DEBUG_STRIPPED) == 0)
    abfd->flags |= HAS_DEBUG;
#endif

  return coff;
}
#endif

/* Determine the machine architecture and type.  FIXME: This is target
   dependent because the magic numbers are defined in the target
   dependent header files.  But there is no particular need for this.
   If the magic numbers were moved to a separate file, this function
   would be target independent and would also be much more successful
   at linking together COFF files for different architectures.  */

static bfd_boolean
coff_set_arch_mach_hook (bfd *abfd, void * filehdr)
{
  unsigned long machine;
  enum bfd_architecture arch;
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;

  /* Zero selects the default machine for an arch.  */
  machine = 0;
  switch (internal_f->f_magic)
    {
#ifdef OR32_MAGIC_BIG
    case OR32_MAGIC_BIG:
    case OR32_MAGIC_LITTLE:
      arch = bfd_arch_or32;
      break;
#endif
#ifdef PPCMAGIC
    case PPCMAGIC:
      arch = bfd_arch_powerpc;
      break;
#endif
#ifdef I386MAGIC
    case I386MAGIC:
    case I386PTXMAGIC:
    case I386AIXMAGIC:          /* Danbury PS/2 AIX C Compiler.  */
    case LYNXCOFFMAGIC:         /* Shadows the m68k Lynx number below, sigh.  */
      arch = bfd_arch_i386;
      break;
#endif
#ifdef AMD64MAGIC
    case AMD64MAGIC:
      arch = bfd_arch_i386;
      machine = bfd_mach_x86_64;
      break;
#endif
#ifdef IA64MAGIC
    case IA64MAGIC:
      arch = bfd_arch_ia64;
      break;
#endif
#ifdef ARMMAGIC
    case ARMMAGIC:
    case ARMPEMAGIC:
    case THUMBPEMAGIC:
      arch = bfd_arch_arm;
      machine = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION);
      if (machine == bfd_mach_arm_unknown)
        {
          switch (internal_f->f_flags & F_ARM_ARCHITECTURE_MASK)
            {
            case F_ARM_2:  machine = bfd_mach_arm_2;  break;
            case F_ARM_2a: machine = bfd_mach_arm_2a; break;
            case F_ARM_3:  machine = bfd_mach_arm_3;  break;
            default:
            case F_ARM_3M: machine = bfd_mach_arm_3M; break;
            case F_ARM_4:  machine = bfd_mach_arm_4;  break;
            case F_ARM_4T: machine = bfd_mach_arm_4T; break;
              /* The COFF header does not have enough bits available
                 to cover all the different ARM architectures.  So
                 we interpret F_ARM_5, the highest flag value to mean
                 "the highest ARM architecture known to BFD" which is
                 currently the XScale.  */
            case F_ARM_5:  machine = bfd_mach_arm_XScale;  break;
            }
        }
      break;
#endif
#ifdef MC68MAGIC
    case MC68MAGIC:
    case M68MAGIC:
#ifdef MC68KBCSMAGIC
    case MC68KBCSMAGIC:
#endif
#ifdef APOLLOM68KMAGIC
    case APOLLOM68KMAGIC:
#endif
#ifdef LYNXCOFFMAGIC
    case LYNXCOFFMAGIC:
#endif
      arch = bfd_arch_m68k;
      machine = bfd_mach_m68020;
      break;
#endif
#ifdef MAXQ20MAGIC
    case MAXQ20MAGIC:
      arch = bfd_arch_maxq;
      switch (internal_f->f_flags & F_MACHMASK)
        {
        case F_MAXQ10:
          machine = bfd_mach_maxq10;
          break;
        case F_MAXQ20:
          machine = bfd_mach_maxq20;
          break;
        default:
          return FALSE;
        }
      break;
#endif
#ifdef MC88MAGIC
    case MC88MAGIC:
    case MC88DMAGIC:
    case MC88OMAGIC:
      arch = bfd_arch_m88k;
      machine = 88100;
      break;
#endif
#ifdef Z80MAGIC
    case Z80MAGIC:
      arch = bfd_arch_z80;
      switch (internal_f->f_flags & F_MACHMASK)
        {
        case 0:
        case bfd_mach_z80strict << 12:
        case bfd_mach_z80 << 12:
        case bfd_mach_z80full << 12:
        case bfd_mach_r800 << 12:
          machine = ((unsigned)internal_f->f_flags & F_MACHMASK) >> 12;
          break;
        default:
          return FALSE;
        }
      break;
#endif
#ifdef Z8KMAGIC
    case Z8KMAGIC:
      arch = bfd_arch_z8k;
      switch (internal_f->f_flags & F_MACHMASK)
        {
        case F_Z8001:
          machine = bfd_mach_z8001;
          break;
        case F_Z8002:
          machine = bfd_mach_z8002;
          break;
        default:
          return FALSE;
        }
      break;
#endif
#ifdef I860
    case I860MAGIC:
      arch = bfd_arch_i860;
      break;
#endif
#ifdef I960
#ifdef I960ROMAGIC
    case I960ROMAGIC:
    case I960RWMAGIC:
      arch = bfd_arch_i960;
      switch (F_I960TYPE & internal_f->f_flags)
        {
        default:
        case F_I960CORE:
          machine = bfd_mach_i960_core;
          break;
        case F_I960KB:
          machine = bfd_mach_i960_kb_sb;
          break;
        case F_I960MC:
          machine = bfd_mach_i960_mc;
          break;
        case F_I960XA:
          machine = bfd_mach_i960_xa;
          break;
        case F_I960CA:
          machine = bfd_mach_i960_ca;
          break;
        case F_I960KA:
          machine = bfd_mach_i960_ka_sa;
          break;
        case F_I960JX:
          machine = bfd_mach_i960_jx;
          break;
        case F_I960HX:
          machine = bfd_mach_i960_hx;
          break;
        }
      break;
#endif
#endif

#ifdef RS6000COFF_C
#ifdef XCOFF64
    case U64_TOCMAGIC:
    case U803XTOCMAGIC:
#else
    case U802ROMAGIC:
    case U802WRMAGIC:
    case U802TOCMAGIC:
#endif
      {
        int cputype;

        if (xcoff_data (abfd)->cputype != -1)
          cputype = xcoff_data (abfd)->cputype & 0xff;
        else
          {
            /* We did not get a value from the a.out header.  If the
               file has not been stripped, we may be able to get the
               architecture information from the first symbol, if it
               is a .file symbol.  */
            if (obj_raw_syment_count (abfd) == 0)
              cputype = 0;
            else
              {
                bfd_byte *buf;
                struct internal_syment sym;
                bfd_size_type amt = bfd_coff_symesz (abfd);

                buf = bfd_malloc (amt);
                if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0
                    || bfd_bread (buf, amt, abfd) != amt)
                  {
                    free (buf);
                    return FALSE;
                  }
                bfd_coff_swap_sym_in (abfd, buf, & sym);
                if (sym.n_sclass == C_FILE)
                  cputype = sym.n_type & 0xff;
                else
                  cputype = 0;
                free (buf);
              }
          }

        /* FIXME: We don't handle all cases here.  */
        switch (cputype)
          {
          default:
          case 0:
            arch = bfd_xcoff_architecture (abfd);
            machine = bfd_xcoff_machine (abfd);
            break;

          case 1:
            arch = bfd_arch_powerpc;
            machine = bfd_mach_ppc_601;
            break;
          case 2: /* 64 bit PowerPC */
            arch = bfd_arch_powerpc;
            machine = bfd_mach_ppc_620;
            break;
          case 3:
            arch = bfd_arch_powerpc;
            machine = bfd_mach_ppc;
            break;
          case 4:
            arch = bfd_arch_rs6000;
            machine = bfd_mach_rs6k;
            break;
          }
      }
      break;
#endif

#ifdef WE32KMAGIC
    case WE32KMAGIC:
      arch = bfd_arch_we32k;
      break;
#endif

#ifdef H8300MAGIC
    case H8300MAGIC:
      arch = bfd_arch_h8300;
      machine = bfd_mach_h8300;
      /* !! FIXME this probably isn't the right place for this.  */
      abfd->flags |= BFD_IS_RELAXABLE;
      break;
#endif

#ifdef H8300HMAGIC
    case H8300HMAGIC:
      arch = bfd_arch_h8300;
      machine = bfd_mach_h8300h;
      /* !! FIXME this probably isn't the right place for this.  */
      abfd->flags |= BFD_IS_RELAXABLE;
      break;
#endif

#ifdef H8300SMAGIC
    case H8300SMAGIC:
      arch = bfd_arch_h8300;
      machine = bfd_mach_h8300s;
      /* !! FIXME this probably isn't the right place for this.  */
      abfd->flags |= BFD_IS_RELAXABLE;
      break;
#endif

#ifdef H8300HNMAGIC
    case H8300HNMAGIC:
      arch = bfd_arch_h8300;
      machine = bfd_mach_h8300hn;
      /* !! FIXME this probably isn't the right place for this.  */
      abfd->flags |= BFD_IS_RELAXABLE;
      break;
#endif

#ifdef H8300SNMAGIC
    case H8300SNMAGIC:
      arch = bfd_arch_h8300;
      machine = bfd_mach_h8300sn;
      /* !! FIXME this probably isn't the right place for this.  */
      abfd->flags |= BFD_IS_RELAXABLE;
      break;
#endif

#ifdef SH_ARCH_MAGIC_BIG
    case SH_ARCH_MAGIC_BIG:
    case SH_ARCH_MAGIC_LITTLE:
#ifdef COFF_WITH_PE
    case SH_ARCH_MAGIC_WINCE:
#endif
      arch = bfd_arch_sh;
      break;
#endif

#ifdef MIPS_ARCH_MAGIC_WINCE
    case MIPS_ARCH_MAGIC_WINCE:
      arch = bfd_arch_mips;
      break;
#endif

#ifdef H8500MAGIC
    case H8500MAGIC:
      arch = bfd_arch_h8500;
      break;
#endif

#ifdef SPARCMAGIC
    case SPARCMAGIC:
#ifdef LYNXCOFFMAGIC
    case LYNXCOFFMAGIC:
#endif
      arch = bfd_arch_sparc;
      break;
#endif

#ifdef TIC30MAGIC
    case TIC30MAGIC:
      arch = bfd_arch_tic30;
      break;
#endif

#ifdef TICOFF0MAGIC
#ifdef TICOFF_TARGET_ARCH
      /* This TI COFF section should be used by all new TI COFF v0 targets.  */
    case TICOFF0MAGIC:
      arch = TICOFF_TARGET_ARCH;
      machine = TICOFF_TARGET_MACHINE_GET (internal_f->f_flags);
      break;
#endif
#endif

#ifdef TICOFF1MAGIC
      /* This TI COFF section should be used by all new TI COFF v1/2 targets.  */
      /* TI COFF1 and COFF2 use the target_id field to specify which arch.  */
    case TICOFF1MAGIC:
    case TICOFF2MAGIC:
      switch (internal_f->f_target_id)
        {
#ifdef TI_TARGET_ID
        case TI_TARGET_ID:
          arch = TICOFF_TARGET_ARCH;
          machine = TICOFF_TARGET_MACHINE_GET (internal_f->f_flags);
          break;
#endif
        default:
          arch = bfd_arch_obscure;
          (*_bfd_error_handler)
            (_("Unrecognized TI COFF target id '0x%x'"),
             internal_f->f_target_id);
          break;
        }
      break;
#endif

#ifdef TIC80_ARCH_MAGIC
    case TIC80_ARCH_MAGIC:
      arch = bfd_arch_tic80;
      break;
#endif

#ifdef MCOREMAGIC
    case MCOREMAGIC:
      arch = bfd_arch_mcore;
      break;
#endif

#ifdef W65MAGIC
    case W65MAGIC:
      arch = bfd_arch_w65;
      break;
#endif

    default:                    /* Unreadable input file type.  */
      arch = bfd_arch_obscure;
      break;
    }

  bfd_default_set_arch_mach (abfd, arch, machine);
  return TRUE;
}

#ifdef SYMNAME_IN_DEBUG

static bfd_boolean
symname_in_debug_hook (bfd * abfd ATTRIBUTE_UNUSED, struct internal_syment *sym)
{
  return SYMNAME_IN_DEBUG (sym) != 0;
}

#else

#define symname_in_debug_hook \
  (bfd_boolean (*) (bfd *, struct internal_syment *)) bfd_false

#endif

#ifdef RS6000COFF_C

#ifdef XCOFF64
#define FORCE_SYMNAMES_IN_STRINGS
#endif

/* Handle the csect auxent of a C_EXT, C_AIX_WEAKEXT or C_HIDEXT symbol.  */

static bfd_boolean
coff_pointerize_aux_hook (bfd *abfd ATTRIBUTE_UNUSED,
                          combined_entry_type *table_base,
                          combined_entry_type *symbol,
                          unsigned int indaux,
                          combined_entry_type *aux)
{
  int class = symbol->u.syment.n_sclass;

  if (CSECT_SYM_P (class)
      && indaux + 1 == symbol->u.syment.n_numaux)
    {
      if (SMTYP_SMTYP (aux->u.auxent.x_csect.x_smtyp) == XTY_LD)
        {
          aux->u.auxent.x_csect.x_scnlen.p =
            table_base + aux->u.auxent.x_csect.x_scnlen.l;
          aux->fix_scnlen = 1;
        }

      /* Return TRUE to indicate that the caller should not do any
         further work on this auxent.  */
      return TRUE;
    }

  /* Return FALSE to indicate that this auxent should be handled by
     the caller.  */
  return FALSE;
}

#else
#ifdef I960

/* We don't want to pointerize bal entries.  */

static bfd_boolean
coff_pointerize_aux_hook (bfd *abfd ATTRIBUTE_UNUSED,
                          combined_entry_type *table_base ATTRIBUTE_UNUSED,
                          combined_entry_type *symbol,
                          unsigned int indaux,
                          combined_entry_type *aux ATTRIBUTE_UNUSED)
{
  /* Return TRUE if we don't want to pointerize this aux entry, which
     is the case for the lastfirst aux entry for a C_LEAFPROC symbol.  */
  return (indaux == 1
          && (symbol->u.syment.n_sclass == C_LEAFPROC
              || symbol->u.syment.n_sclass == C_LEAFSTAT
              || symbol->u.syment.n_sclass == C_LEAFEXT));
}

#else /* ! I960 */

#define coff_pointerize_aux_hook 0

#endif /* ! I960 */
#endif /* ! RS6000COFF_C */

/* Print an aux entry.  This returns TRUE if it has printed it.  */

static bfd_boolean
coff_print_aux (bfd *abfd ATTRIBUTE_UNUSED,
                FILE *file ATTRIBUTE_UNUSED,
                combined_entry_type *table_base ATTRIBUTE_UNUSED,
                combined_entry_type *symbol ATTRIBUTE_UNUSED,
                combined_entry_type *aux ATTRIBUTE_UNUSED,
                unsigned int indaux ATTRIBUTE_UNUSED)
{
#ifdef RS6000COFF_C
  if (CSECT_SYM_P (symbol->u.syment.n_sclass)
      && indaux + 1 == symbol->u.syment.n_numaux)
    {
      /* This is a csect entry.  */
      fprintf (file, "AUX ");
      if (SMTYP_SMTYP (aux->u.auxent.x_csect.x_smtyp) != XTY_LD)
        {
          BFD_ASSERT (! aux->fix_scnlen);
#ifdef XCOFF64
          fprintf (file, "val %5lld",
                   (long long) aux->u.auxent.x_csect.x_scnlen.l);
#else
          fprintf (file, "val %5ld", (long) aux->u.auxent.x_csect.x_scnlen.l);
#endif
        }
      else
        {
          fprintf (file, "indx ");
          if (! aux->fix_scnlen)
#ifdef XCOFF64
            fprintf (file, "%4lld",
                     (long long) aux->u.auxent.x_csect.x_scnlen.l);
#else
            fprintf (file, "%4ld", (long) aux->u.auxent.x_csect.x_scnlen.l);
#endif
          else
            fprintf (file, "%4ld",
                     (long) (aux->u.auxent.x_csect.x_scnlen.p - table_base));
        }
      fprintf (file,
               " prmhsh %ld snhsh %u typ %d algn %d clss %u stb %ld snstb %u",
               aux->u.auxent.x_csect.x_parmhash,
               (unsigned int) aux->u.auxent.x_csect.x_snhash,
               SMTYP_SMTYP (aux->u.auxent.x_csect.x_smtyp),
               SMTYP_ALIGN (aux->u.auxent.x_csect.x_smtyp),
               (unsigned int) aux->u.auxent.x_csect.x_smclas,
               aux->u.auxent.x_csect.x_stab,
               (unsigned int) aux->u.auxent.x_csect.x_snstab);
      return TRUE;
    }
#endif

  /* Return FALSE to indicate that no special action was taken.  */
  return FALSE;
}

/*
SUBSUBSECTION
        Writing relocations

        To write relocations, the back end steps though the
        canonical relocation table and create an
        @code{internal_reloc}. The symbol index to use is removed from
        the @code{offset} field in the symbol table supplied.  The
        address comes directly from the sum of the section base
        address and the relocation offset; the type is dug directly
        from the howto field.  Then the @code{internal_reloc} is
        swapped into the shape of an @code{external_reloc} and written
        out to disk.

*/

#ifdef TARG_AUX


/* AUX's ld wants relocations to be sorted.  */
static int
compare_arelent_ptr (const void * x, const void * y)
{
  const arelent **a = (const arelent **) x;
  const arelent **b = (const arelent **) y;
  bfd_size_type aadr = (*a)->address;
  bfd_size_type badr = (*b)->address;

  return (aadr < badr ? -1 : badr < aadr ? 1 : 0);
}

#endif /* TARG_AUX */

static bfd_boolean
coff_write_relocs (bfd * abfd, int first_undef)
{
  asection *s;

  for (s = abfd->sections; s != NULL; s = s->next)
    {
      unsigned int i;
      struct external_reloc dst;
      arelent **p;

#ifndef TARG_AUX
      p = s->orelocation;
#else
      {
        /* Sort relocations before we write them out.  */
        bfd_size_type amt;

        amt = s->reloc_count;
        amt *= sizeof (arelent *);
        p = bfd_malloc (amt);
        if (p == NULL && s->reloc_count > 0)
          return FALSE;
        memcpy (p, s->orelocation, (size_t) amt);
        qsort (p, s->reloc_count, sizeof (arelent *), compare_arelent_ptr);
      }
#endif

      if (bfd_seek (abfd, s->rel_filepos, SEEK_SET) != 0)
        return FALSE;

#ifdef COFF_WITH_PE
      if (obj_pe (abfd) && s->reloc_count >= 0xffff)
        {
          /* Encode real count here as first reloc.  */
          struct internal_reloc n;

          memset (& n, 0, sizeof (n));
          /* Add one to count *this* reloc (grr).  */
          n.r_vaddr = s->reloc_count + 1;
          coff_swap_reloc_out (abfd, &n, &dst);
          if (bfd_bwrite (& dst, (bfd_size_type) bfd_coff_relsz (abfd),
                          abfd) != bfd_coff_relsz (abfd))
            return FALSE;
        }
#endif

      for (i = 0; i < s->reloc_count; i++)
        {
          struct internal_reloc n;
          arelent *q = p[i];

          memset (& n, 0, sizeof (n));

          /* Now we've renumbered the symbols we know where the
             undefined symbols live in the table.  Check the reloc
             entries for symbols who's output bfd isn't the right one.
             This is because the symbol was undefined (which means
             that all the pointers are never made to point to the same
             place). This is a bad thing,'cause the symbols attached
             to the output bfd are indexed, so that the relocation
             entries know which symbol index they point to.  So we
             have to look up the output symbol here.  */

          if (q->sym_ptr_ptr[0]->the_bfd != abfd)
            {
              int j;
              const char *sname = q->sym_ptr_ptr[0]->name;
              asymbol **outsyms = abfd->outsymbols;

              for (j = first_undef; outsyms[j]; j++)
                {
                  const char *intable = outsyms[j]->name;

                  if (strcmp (intable, sname) == 0)
                    {
                      /* Got a hit, so repoint the reloc.  */
                      q->sym_ptr_ptr = outsyms + j;
                      break;
                    }
                }
            }

          n.r_vaddr = q->address + s->vma;

#ifdef R_IHCONST
          /* The 29k const/consth reloc pair is a real kludge.  The consth
             part doesn't have a symbol; it has an offset.  So rebuilt
             that here.  */
          if (q->howto->type == R_IHCONST)
            n.r_symndx = q->addend;
          else
#endif
            if (q->sym_ptr_ptr)
              {
#ifdef SECTION_RELATIVE_ABSOLUTE_SYMBOL_P
                if (SECTION_RELATIVE_ABSOLUTE_SYMBOL_P (q, s))
#else
                if ((*q->sym_ptr_ptr)->section == bfd_abs_section_ptr
                    && ((*q->sym_ptr_ptr)->flags & BSF_SECTION_SYM) != 0)
#endif
                  /* This is a relocation relative to the absolute symbol.  */
                  n.r_symndx = -1;
                else
                  {
                    n.r_symndx = get_index ((*(q->sym_ptr_ptr)));
                    /* Check to see if the symbol reloc points to a symbol
                       we don't have in our symbol table.  */
                    if (n.r_symndx > obj_conv_table_size (abfd))
                      {
                        bfd_set_error (bfd_error_bad_value);
                        _bfd_error_handler (_("%B: reloc against a non-existant symbol index: %ld"),
                                            abfd, n.r_symndx);
                        return FALSE;
                      }
                  }
              }

#ifdef SWAP_OUT_RELOC_OFFSET
          n.r_offset = q->addend;
#endif

#ifdef SELECT_RELOC
          /* Work out reloc type from what is required.  */
          SELECT_RELOC (n, q->howto);
#else
          n.r_type = q->howto->type;
#endif
          coff_swap_reloc_out (abfd, &n, &dst);

          if (bfd_bwrite (& dst, (bfd_size_type) bfd_coff_relsz (abfd),
                         abfd) != bfd_coff_relsz (abfd))
            return FALSE;
        }

#ifdef TARG_AUX
      if (p != NULL)
        free (p);
#endif
    }

  return TRUE;
}

/* Set flags and magic number of a coff file from architecture and machine
   type.  Result is TRUE if we can represent the arch&type, FALSE if not.  */

static bfd_boolean
coff_set_flags (bfd * abfd,
                unsigned int *magicp ATTRIBUTE_UNUSED,
                unsigned short *flagsp ATTRIBUTE_UNUSED)
{
  switch (bfd_get_arch (abfd))
    {
#ifdef Z80MAGIC
    case bfd_arch_z80:
      *magicp = Z80MAGIC;
      switch (bfd_get_mach (abfd))
        {
        case 0:
        case bfd_mach_z80strict:
        case bfd_mach_z80:
        case bfd_mach_z80full:
        case bfd_mach_r800:
          *flagsp = bfd_get_mach (abfd) << 12;
          break;
        default:
          return FALSE;
        }
      return TRUE;
#endif

#ifdef Z8KMAGIC
    case bfd_arch_z8k:
      *magicp = Z8KMAGIC;

      switch (bfd_get_mach (abfd))
        {
        case bfd_mach_z8001: *flagsp = F_Z8001; break;
        case bfd_mach_z8002: *flagsp = F_Z8002; break;
        default:             return FALSE;
        }
      return TRUE;
#endif

#ifdef I960ROMAGIC
    case bfd_arch_i960:

      {
        unsigned flags;

        *magicp = I960ROMAGIC;

        switch (bfd_get_mach (abfd))
          {
          case bfd_mach_i960_core:  flags = F_I960CORE; break;
          case bfd_mach_i960_kb_sb: flags = F_I960KB;   break;
          case bfd_mach_i960_mc:    flags = F_I960MC;   break;
          case bfd_mach_i960_xa:    flags = F_I960XA;   break;
          case bfd_mach_i960_ca:    flags = F_I960CA;   break;
          case bfd_mach_i960_ka_sa: flags = F_I960KA;   break;
          case bfd_mach_i960_jx:    flags = F_I960JX;   break;
          case bfd_mach_i960_hx:    flags = F_I960HX;   break;
          default:                  return FALSE;
          }
        *flagsp = flags;
        return TRUE;
      }
      break;
#endif

#ifdef TIC30MAGIC
    case bfd_arch_tic30:
      *magicp = TIC30MAGIC;
      return TRUE;
#endif

#ifdef TICOFF_DEFAULT_MAGIC
    case TICOFF_TARGET_ARCH:
      /* If there's no indication of which version we want, use the default.  */
      if (!abfd->xvec )
        *magicp = TICOFF_DEFAULT_MAGIC;
      else
        {
          /* We may want to output in a different COFF version.  */
          switch (abfd->xvec->name[4])
            {
            case '0':
              *magicp = TICOFF0MAGIC;
              break;
            case '1':
              *magicp = TICOFF1MAGIC;
              break;
            case '2':
              *magicp = TICOFF2MAGIC;
              break;
            default:
              return FALSE;
            }
        }
      TICOFF_TARGET_MACHINE_SET (flagsp, bfd_get_mach (abfd));
      return TRUE;
#endif

#ifdef TIC80_ARCH_MAGIC
    case bfd_arch_tic80:
      *magicp = TIC80_ARCH_MAGIC;
      return TRUE;
#endif

#ifdef ARMMAGIC
    case bfd_arch_arm:
#ifdef ARM_WINCE
      * magicp = ARMPEMAGIC;
#else
      * magicp = ARMMAGIC;
#endif
      * flagsp = 0;
      if (APCS_SET (abfd))
        {
          if (APCS_26_FLAG (abfd))
            * flagsp |= F_APCS26;

          if (APCS_FLOAT_FLAG (abfd))
            * flagsp |= F_APCS_FLOAT;

          if (PIC_FLAG (abfd))
            * flagsp |= F_PIC;
        }
      if (INTERWORK_SET (abfd) && INTERWORK_FLAG (abfd))
        * flagsp |= F_INTERWORK;
      switch (bfd_get_mach (abfd))
        {
        case bfd_mach_arm_2:  * flagsp |= F_ARM_2;  break;
        case bfd_mach_arm_2a: * flagsp |= F_ARM_2a; break;
        case bfd_mach_arm_3:  * flagsp |= F_ARM_3;  break;
        case bfd_mach_arm_3M: * flagsp |= F_ARM_3M; break;
        case bfd_mach_arm_4:  * flagsp |= F_ARM_4;  break;
        case bfd_mach_arm_4T: * flagsp |= F_ARM_4T; break;
        case bfd_mach_arm_5:  * flagsp |= F_ARM_5;  break;
          /* FIXME: we do not have F_ARM vaues greater than F_ARM_5.
             See also the comment in coff_set_arch_mach_hook().  */
        case bfd_mach_arm_5T: * flagsp |= F_ARM_5;  break;
        case bfd_mach_arm_5TE: * flagsp |= F_ARM_5; break;
        case bfd_mach_arm_XScale: * flagsp |= F_ARM_5; break;
        }
      return TRUE;
#endif

#ifdef PPCMAGIC
    case bfd_arch_powerpc:
      *magicp = PPCMAGIC;
      return TRUE;
#endif

#if defined(I386MAGIC) || defined(AMD64MAGIC)
    case bfd_arch_i386:
#if defined(I386MAGIC)
      *magicp = I386MAGIC;
#endif
#if defined LYNXOS
      /* Just overwrite the usual value if we're doing Lynx.  */
      *magicp = LYNXCOFFMAGIC;
#endif
#if defined AMD64MAGIC
      *magicp = AMD64MAGIC;
#endif
      return TRUE;
#endif

#ifdef I860MAGIC
    case bfd_arch_i860:
      *magicp = I860MAGIC;
      return TRUE;
#endif

#ifdef IA64MAGIC
    case bfd_arch_ia64:
      *magicp = IA64MAGIC;
      return TRUE;
#endif

#ifdef MC68MAGIC
    case bfd_arch_m68k:
#ifdef APOLLOM68KMAGIC
      *magicp = APOLLO_COFF_VERSION_NUMBER;
#else
      /* NAMES_HAVE_UNDERSCORE may be defined by coff-u68k.c.  */
#ifdef NAMES_HAVE_UNDERSCORE
      *magicp = MC68KBCSMAGIC;
#else
      *magicp = MC68MAGIC;
#endif
#endif
#ifdef LYNXOS
      /* Just overwrite the usual value if we're doing Lynx.  */
      *magicp = LYNXCOFFMAGIC;
#endif
      return TRUE;
#endif

#ifdef MC88MAGIC
    case bfd_arch_m88k:
      *magicp = MC88OMAGIC;
      return TRUE;
#endif

#ifdef H8300MAGIC
    case bfd_arch_h8300:
      switch (bfd_get_mach (abfd))
        {
        case bfd_mach_h8300:   *magicp = H8300MAGIC;   return TRUE;
        case bfd_mach_h8300h:  *magicp = H8300HMAGIC;  return TRUE;
        case bfd_mach_h8300s:  *magicp = H8300SMAGIC;  return TRUE;
        case bfd_mach_h8300hn: *magicp = H8300HNMAGIC; return TRUE;
        case bfd_mach_h8300sn: *magicp = H8300SNMAGIC; return TRUE;
        default: break;
        }
      break;
#endif

#ifdef SH_ARCH_MAGIC_BIG
    case bfd_arch_sh:
#ifdef COFF_IMAGE_WITH_PE
      *magicp = SH_ARCH_MAGIC_WINCE;
#else
      if (bfd_big_endian (abfd))
        *magicp = SH_ARCH_MAGIC_BIG;
      else
        *magicp = SH_ARCH_MAGIC_LITTLE;
#endif
      return TRUE;
#endif

#ifdef MIPS_ARCH_MAGIC_WINCE
    case bfd_arch_mips:
      *magicp = MIPS_ARCH_MAGIC_WINCE;
      return TRUE;
#endif

#ifdef SPARCMAGIC
    case bfd_arch_sparc:
      *magicp = SPARCMAGIC;
#ifdef LYNXOS
      /* Just overwrite the usual value if we're doing Lynx.  */
      *magicp = LYNXCOFFMAGIC;
#endif
      return TRUE;
#endif

#ifdef H8500MAGIC
    case bfd_arch_h8500:
      *magicp = H8500MAGIC;
      return TRUE;
      break;
#endif

#ifdef WE32KMAGIC
    case bfd_arch_we32k:
      *magicp = WE32KMAGIC;
      return TRUE;
#endif

#ifdef RS6000COFF_C
    case bfd_arch_rs6000:
#ifndef PPCMAGIC
    case bfd_arch_powerpc:
#endif
      BFD_ASSERT (bfd_get_flavour (abfd) == bfd_target_xcoff_flavour);
      *magicp = bfd_xcoff_magic_number (abfd);
      return TRUE;
#endif

#ifdef MCOREMAGIC
    case bfd_arch_mcore:
      * magicp = MCOREMAGIC;
      return TRUE;
#endif

#ifdef W65MAGIC
    case bfd_arch_w65:
      *magicp = W65MAGIC;
      return TRUE;
#endif

#ifdef OR32_MAGIC_BIG
    case bfd_arch_or32:
      if (bfd_big_endian (abfd))
        * magicp = OR32_MAGIC_BIG;
      else
        * magicp = OR32_MAGIC_LITTLE;
      return TRUE;
#endif

#ifdef MAXQ20MAGIC
    case bfd_arch_maxq:
      * magicp = MAXQ20MAGIC;
      switch (bfd_get_mach (abfd))
        {
        case bfd_mach_maxq10: * flagsp = F_MAXQ10; return TRUE;
        case bfd_mach_maxq20: * flagsp = F_MAXQ20; return TRUE;
        default:              return FALSE;
        }
#endif

    default:                    /* Unknown architecture.  */
      /* Fall through to "return FALSE" below, to avoid
         "statement never reached" errors on the one below.  */
      break;
    }

  return FALSE;
}

static bfd_boolean
coff_set_arch_mach (bfd * abfd,
                    enum bfd_architecture arch,
                    unsigned long machine)
{
  unsigned dummy1;
  unsigned short dummy2;

  if (! bfd_default_set_arch_mach (abfd, arch, machine))
    return FALSE;

  if (arch != bfd_arch_unknown
      && ! coff_set_flags (abfd, &dummy1, &dummy2))
    return FALSE;               /* We can't represent this type.  */

  return TRUE;                  /* We're easy...  */
}

#ifdef COFF_IMAGE_WITH_PE

/* This is used to sort sections by VMA, as required by PE image
   files.  */

static int
sort_by_secaddr (const void * arg1, const void * arg2)
{
  const asection *a = *(const asection **) arg1;
  const asection *b = *(const asection **) arg2;

  if (a->vma < b->vma)
    return -1;
  else if (a->vma > b->vma)
    return 1;

  return 0;
}

#endif /* COFF_IMAGE_WITH_PE */

/* Calculate the file position for each section.  */

#ifndef I960
#define ALIGN_SECTIONS_IN_FILE
#endif
#if defined(TIC80COFF) || defined(TICOFF)
#undef ALIGN_SECTIONS_IN_FILE
#endif

static bfd_boolean
coff_compute_section_file_positions (bfd * abfd)
{
  asection *current;
  asection *previous = NULL;
  file_ptr sofar = bfd_coff_filhsz (abfd);
  bfd_boolean align_adjust;
#ifdef ALIGN_SECTIONS_IN_FILE
  file_ptr old_sofar;
#endif

#ifdef RS6000COFF_C
  /* On XCOFF, if we have symbols, set up the .debug section.  */
  if (bfd_get_symcount (abfd) > 0)
    {
      bfd_size_type sz;
      bfd_size_type i, symcount;
      asymbol **symp;

      sz = 0;
      symcount = bfd_get_symcount (abfd);
      for (symp = abfd->outsymbols, i = 0; i < symcount; symp++, i++)
        {
          coff_symbol_type *cf;

          cf = coff_symbol_from (abfd, *symp);
          if (cf != NULL
              && cf->native != NULL
              && SYMNAME_IN_DEBUG (&cf->native->u.syment))
            {
              size_t len;

              len = strlen (bfd_asymbol_name (*symp));
              if (len > SYMNMLEN || bfd_coff_force_symnames_in_strings (abfd))
                sz += len + 1 + bfd_coff_debug_string_prefix_length (abfd);
            }
        }
      if (sz > 0)
        {
          asection *dsec;

          dsec = bfd_make_section_old_way (abfd, DOT_DEBUG);
          if (dsec == NULL)
            abort ();
          dsec->size = sz;
          dsec->flags |= SEC_HAS_CONTENTS;
        }
    }
#endif

#ifdef COFF_IMAGE_WITH_PE
  int page_size;

  if (coff_data (abfd)->link_info)
    {
      page_size = pe_data (abfd)->pe_opthdr.FileAlignment;

      /* If no file alignment has been set, default to one.
         This repairs 'ld -r' for arm-wince-pe target.  */
      if (page_size == 0)
        page_size = 1;
    }
  else
    page_size = PE_DEF_FILE_ALIGNMENT;
#else
#ifdef COFF_PAGE_SIZE
  int page_size = COFF_PAGE_SIZE;
#endif
#endif

  if (bfd_get_start_address (abfd))
    /*  A start address may have been added to the original file. In this
        case it will need an optional header to record it.  */
    abfd->flags |= EXEC_P;

  if (abfd->flags & EXEC_P)
    sofar += bfd_coff_aoutsz (abfd);
#ifdef RS6000COFF_C
  else if (xcoff_data (abfd)->full_aouthdr)
    sofar += bfd_coff_aoutsz (abfd);
  else
    sofar += SMALL_AOUTSZ;
#endif

  sofar += abfd->section_count * bfd_coff_scnhsz (abfd);

#ifdef RS6000COFF_C
  /* XCOFF handles overflows in the reloc and line number count fields
     by allocating a new section header to hold the correct counts.  */
  for (current = abfd->sections; current != NULL; current = current->next)
    if (current->reloc_count >= 0xffff || current->lineno_count >= 0xffff)
      sofar += bfd_coff_scnhsz (abfd);
#endif

#ifdef COFF_IMAGE_WITH_PE
  {
    /* PE requires the sections to be in memory order when listed in
       the section headers.  It also does not like empty loadable
       sections.  The sections apparently do not have to be in the
       right order in the image file itself, but we do need to get the
       target_index values right.  */

    unsigned int count;
    asection **section_list;
    unsigned int i;
    int target_index;
    bfd_size_type amt;

#ifdef COFF_PAGE_SIZE
    /* Clear D_PAGED if section alignment is smaller than
       COFF_PAGE_SIZE.  */
   if (pe_data (abfd)->pe_opthdr.SectionAlignment < COFF_PAGE_SIZE)
     abfd->flags &= ~D_PAGED;
#endif

    count = 0;
    for (current = abfd->sections; current != NULL; current = current->next)
      ++count;

    /* We allocate an extra cell to simplify the final loop.  */
    amt = sizeof (struct asection *) * (count + 1);
    section_list = bfd_malloc (amt);
    if (section_list == NULL)
      return FALSE;

    i = 0;
    for (current = abfd->sections; current != NULL; current = current->next)
      {
        section_list[i] = current;
        ++i;
      }
    section_list[i] = NULL;

    qsort (section_list, count, sizeof (asection *), sort_by_secaddr);

    /* Rethread the linked list into sorted order; at the same time,
       assign target_index values.  */
    target_index = 1;
    abfd->sections = NULL;
    abfd->section_last = NULL;
    for (i = 0; i < count; i++)
      {
        current = section_list[i];
        bfd_section_list_append (abfd, current);

        /* Later, if the section has zero size, we'll be throwing it
           away, so we don't want to number it now.  Note that having
           a zero size and having real contents are different
           concepts: .bss has no contents, but (usually) non-zero
           size.  */
        if (current->size == 0)
          {
            /* Discard.  However, it still might have (valid) symbols
               in it, so arbitrarily set it to section 1 (indexing is
               1-based here; usually .text).  __end__ and other
               contents of .endsection really have this happen.
               FIXME: This seems somewhat dubious.  */
            current->target_index = 1;
          }
        else
          current->target_index = target_index++;
      }

    free (section_list);
  }
#else /* ! COFF_IMAGE_WITH_PE */
  {
    /* Set the target_index field.  */
    int target_index;

    target_index = 1;
    for (current = abfd->sections; current != NULL; current = current->next)
      current->target_index = target_index++;
  }
#endif /* ! COFF_IMAGE_WITH_PE */

  align_adjust = FALSE;
  for (current = abfd->sections;
       current != NULL;
       current = current->next)
    {
#ifdef COFF_IMAGE_WITH_PE
      /* With PE we have to pad each section to be a multiple of its
         page size too, and remember both sizes.  */
      if (coff_section_data (abfd, current) == NULL)
        {
          bfd_size_type amt = sizeof (struct coff_section_tdata);

          current->used_by_bfd = bfd_zalloc (abfd, amt);
          if (current->used_by_bfd == NULL)
            return FALSE;
        }
      if (pei_section_data (abfd, current) == NULL)
        {
          bfd_size_type amt = sizeof (struct pei_section_tdata);

          coff_section_data (abfd, current)->tdata = bfd_zalloc (abfd, amt);
          if (coff_section_data (abfd, current)->tdata == NULL)
            return FALSE;
        }
      if (pei_section_data (abfd, current)->virt_size == 0)
        pei_section_data (abfd, current)->virt_size = current->size;
#endif

      /* Only deal with sections which have contents.  */
      if (!(current->flags & SEC_HAS_CONTENTS))
        continue;

#ifdef COFF_IMAGE_WITH_PE
      /* Make sure we skip empty sections in a PE image.  */
      if (current->size == 0)
        continue;
#endif

      /* Align the sections in the file to the same boundary on
         which they are aligned in virtual memory.  I960 doesn't
         do this (FIXME) so we can stay in sync with Intel.  960
         doesn't yet page from files...  */
#ifdef ALIGN_SECTIONS_IN_FILE
      if ((abfd->flags & EXEC_P) != 0)
        {
          /* Make sure this section is aligned on the right boundary - by
             padding the previous section up if necessary.  */
          old_sofar = sofar;

#ifdef RS6000COFF_C
          /* AIX loader checks the text section alignment of (vma - filepos)
             So even though the filepos may be aligned wrt the o_algntext, for
             AIX executables, this check fails. This shows up when a native
             AIX executable is stripped with gnu strip because the default vma
             of native is 0x10000150 but default for gnu is 0x10000140.  Gnu
             stripped gnu excutable passes this check because the filepos is
             0x0140.  This problem also show up with 64 bit shared objects. The
             data section must also be aligned.  */
          if (!strcmp (current->name, _TEXT)
              || !strcmp (current->name, _DATA))
            {
              bfd_vma pad;
              bfd_vma align;

              sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);

              align = 1 << current->alignment_power;
              pad = abs (current->vma - sofar) % align;

              if (pad)
                {
                  pad = align - pad;
                  sofar += pad;
                }
            }
          else
#else
            {
              sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);
            }
#endif
          if (previous != NULL)
            previous->size += sofar - old_sofar;
        }

#endif

      /* In demand paged files the low order bits of the file offset
         must match the low order bits of the virtual address.  */
#ifdef COFF_PAGE_SIZE
      if ((abfd->flags & D_PAGED) != 0
          && (current->flags & SEC_ALLOC) != 0)
        sofar += (current->vma - (bfd_vma) sofar) % page_size;
#endif
      current->filepos = sofar;

#ifdef COFF_IMAGE_WITH_PE
      /* Set the padded size.  */
      current->size = (current->size + page_size -1) & -page_size;
#endif

      sofar += current->size;

#ifdef ALIGN_SECTIONS_IN_FILE
      /* Make sure that this section is of the right size too.  */
      if ((abfd->flags & EXEC_P) == 0)
        {
          bfd_size_type old_size;

          old_size = current->size;
          current->size = BFD_ALIGN (current->size,
                                     1 << current->alignment_power);
          align_adjust = current->size != old_size;
          sofar += current->size - old_size;
        }
      else
        {
          old_sofar = sofar;
          sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);
          align_adjust = sofar != old_sofar;
          current->size += sofar - old_sofar;
        }
#endif

#ifdef COFF_IMAGE_WITH_PE
      /* For PE we need to make sure we pad out to the aligned
         size, in case the caller only writes out data to the
         unaligned size.  */
      if (pei_section_data (abfd, current)->virt_size < current->size)
        align_adjust = TRUE;
#endif

#ifdef _LIB
      /* Force .lib sections to start at zero.  The vma is then
         incremented in coff_set_section_contents.  This is right for
         SVR3.2.  */
      if (strcmp (current->name, _LIB) == 0)
        bfd_set_section_vma (abfd, current, 0);
#endif

      previous = current;
    }

  /* It is now safe to write to the output file.  If we needed an
     alignment adjustment for the last section, then make sure that
     there is a byte at offset sofar.  If there are no symbols and no
     relocs, then nothing follows the last section.  If we don't force
     the last byte out, then the file may appear to be truncated.  */
  if (align_adjust)
    {
      bfd_byte b;

      b = 0;
      if (bfd_seek (abfd, sofar - 1, SEEK_SET) != 0
          || bfd_bwrite (&b, (bfd_size_type) 1, abfd) != 1)
        return FALSE;
    }

  /* Make sure the relocations are aligned.  We don't need to make
     sure that this byte exists, because it will only matter if there
     really are relocs.  */
  sofar = BFD_ALIGN (sofar, 1 << COFF_DEFAULT_SECTION_ALIGNMENT_POWER);

  obj_relocbase (abfd) = sofar;
  abfd->output_has_begun = TRUE;

  return TRUE;
}

#ifdef COFF_IMAGE_WITH_PE

static unsigned int pelength;
static unsigned int peheader;

static bfd_boolean
coff_read_word (bfd *abfd, unsigned int *value)
{
  unsigned char b[2];
  int status;

  status = bfd_bread (b, (bfd_size_type) 2, abfd);
  if (status < 1)
    {
      *value = 0;
      return FALSE;
    }

  if (status == 1)
    *value = (unsigned int) b[0];
  else
    *value = (unsigned int) (b[0] + (b[1] << 8));

  pelength += (unsigned int) status;

  return TRUE;
}

static unsigned int
coff_compute_checksum (bfd *abfd)
{
  bfd_boolean more_data;
  file_ptr filepos;
  unsigned int value;
  unsigned int total;

  total = 0;
  pelength = 0;
  filepos = (file_ptr) 0;

  do
    {
      if (bfd_seek (abfd, filepos, SEEK_SET) != 0)
        return 0;

      more_data = coff_read_word (abfd, &value);
      total += value;
      total = 0xffff & (total + (total >> 0x10));
      filepos += 2;
    }
  while (more_data);

  return (0xffff & (total + (total >> 0x10)));
}

static bfd_boolean
coff_apply_checksum (bfd *abfd)
{
  unsigned int computed;
  unsigned int checksum = 0;

  if (bfd_seek (abfd, 0x3c, SEEK_SET) != 0)
    return FALSE;

  if (!coff_read_word (abfd, &peheader))
    return FALSE;

  if (bfd_seek (abfd, peheader + 0x58, SEEK_SET) != 0)
    return FALSE;

  checksum = 0;
  bfd_bwrite (&checksum, (bfd_size_type) 4, abfd);

  if (bfd_seek (abfd, peheader, SEEK_SET) != 0)
    return FALSE;

  computed = coff_compute_checksum (abfd);

  checksum = computed + pelength;

  if (bfd_seek (abfd, peheader + 0x58, SEEK_SET) != 0)
    return FALSE;

  bfd_bwrite (&checksum, (bfd_size_type) 4, abfd);

  return TRUE;
}

#endif /* COFF_IMAGE_WITH_PE */

static bfd_boolean
coff_write_object_contents (bfd * abfd)
{
  asection *current;
  bfd_boolean hasrelocs = FALSE;
  bfd_boolean haslinno = FALSE;
  bfd_boolean hasdebug = FALSE;
  file_ptr scn_base;
  file_ptr reloc_base;
  file_ptr lineno_base;
  file_ptr sym_base;
  unsigned long reloc_size = 0, reloc_count = 0;
  unsigned long lnno_size = 0;
  bfd_boolean long_section_names;
  asection *text_sec = NULL;
  asection *data_sec = NULL;
  asection *bss_sec = NULL;
  struct internal_filehdr internal_f;
  struct internal_aouthdr internal_a;
#ifdef COFF_LONG_SECTION_NAMES
  size_t string_size = STRING_SIZE_SIZE;
#endif

  bfd_set_error (bfd_error_system_call);

  /* Make a pass through the symbol table to count line number entries and
     put them into the correct asections.  */
  lnno_size = coff_count_linenumbers (abfd) * bfd_coff_linesz (abfd);

  if (! abfd->output_has_begun)
    {
      if (! coff_compute_section_file_positions (abfd))
        return FALSE;
    }

  reloc_base = obj_relocbase (abfd);

  /* Work out the size of the reloc and linno areas.  */

  for (current = abfd->sections; current != NULL; current =
       current->next)
    {
#ifdef COFF_WITH_PE
      /* We store the actual reloc count in the first reloc's addr.  */
      if (obj_pe (abfd) && current->reloc_count >= 0xffff)
        reloc_count ++;
#endif
      reloc_count += current->reloc_count;
    }

  reloc_size = reloc_count * bfd_coff_relsz (abfd);

  lineno_base = reloc_base + reloc_size;
  sym_base = lineno_base + lnno_size;

  /* Indicate in each section->line_filepos its actual file address.  */
  for (current = abfd->sections; current != NULL; current =
       current->next)
    {
      if (current->lineno_count)
        {
          current->line_filepos = lineno_base;
          current->moving_line_filepos = lineno_base;
          lineno_base += current->lineno_count * bfd_coff_linesz (abfd);
        }
      else
        current->line_filepos = 0;

      if (current->reloc_count)
        {
          current->rel_filepos = reloc_base;
          reloc_base += current->reloc_count * bfd_coff_relsz (abfd);
#ifdef COFF_WITH_PE
          /* Extra reloc to hold real count.  */
          if (obj_pe (abfd) && current->reloc_count >= 0xffff)
            reloc_base += bfd_coff_relsz (abfd);
#endif
        }
      else
        current->rel_filepos = 0;
    }

  /* Write section headers to the file.  */
  internal_f.f_nscns = 0;

  if ((abfd->flags & EXEC_P) != 0)
    scn_base = bfd_coff_filhsz (abfd) + bfd_coff_aoutsz (abfd);
  else
    {
      scn_base = bfd_coff_filhsz (abfd);
#ifdef RS6000COFF_C
#ifndef XCOFF64
      if (xcoff_data (abfd)->full_aouthdr)
        scn_base += bfd_coff_aoutsz (abfd);
      else
        scn_base += SMALL_AOUTSZ;
#endif
#endif
    }

  if (bfd_seek (abfd, scn_base, SEEK_SET) != 0)
    return FALSE;

  long_section_names = FALSE;
  for (current = abfd->sections;
       current != NULL;
       current = current->next)
    {
      struct internal_scnhdr section;
      bfd_boolean is_reloc_section = FALSE;

#ifdef COFF_IMAGE_WITH_PE
      if (strcmp (current->name, DOT_RELOC) == 0)
        {
          is_reloc_section = TRUE;
          hasrelocs = TRUE;
          pe_data (abfd)->has_reloc_section = 1;
        }
#endif

      internal_f.f_nscns++;

      strncpy (section.s_name, current->name, SCNNMLEN);

#ifdef COFF_LONG_SECTION_NAMES
      /* Handle long section names as in PE.  This must be compatible
         with the code in coff_write_symbols and _bfd_coff_final_link.  */
      if (bfd_coff_long_section_names (abfd))
        {
          size_t len;

          len = strlen (current->name);
          if (len > SCNNMLEN)
            {
              /* The s_name field is defined to be NUL-padded but need not be
                 NUL-terminated.  We use a temporary buffer so that we can still
                 sprintf all eight chars without splatting a terminating NUL
                 over the first byte of the following member (s_paddr).  */
              char s_name_buf[SCNNMLEN + 1];

              /* An inherent limitation of the /nnnnnnn notation used to indicate
                 the offset of the long name in the string table is that we
                 cannot address entries beyone the ten million byte boundary.  */
              if (string_size >= 10000000)
                {
                  bfd_set_error (bfd_error_file_too_big);
                  (*_bfd_error_handler)
                    (_("%B: section %s: string table overflow at offset %ld"),
                    abfd, current->name, string_size);
                  return FALSE;
                }

              /* snprintf not strictly necessary now we've verified the value
                 has less than eight ASCII digits, but never mind.  */
              snprintf (s_name_buf, SCNNMLEN + 1, "/%lu", (unsigned long) string_size);
              /* Then strncpy takes care of any padding for us.  */
              strncpy (section.s_name, s_name_buf, SCNNMLEN);
              string_size += len + 1;
              long_section_names = TRUE;
            }
        }
#endif

#ifdef _LIB
      /* Always set s_vaddr of .lib to 0.  This is right for SVR3.2
         Ian Taylor <ian@cygnus.com>.  */
      if (strcmp (current->name, _LIB) == 0)
        section.s_vaddr = 0;
      else
#endif
      section.s_vaddr = current->vma;
      section.s_paddr = current->lma;
      section.s_size =  current->size;
#ifdef coff_get_section_load_page
      section.s_page = coff_get_section_load_page (current);
#else
      section.s_page = 0;
#endif

#ifdef COFF_WITH_PE
      section.s_paddr = 0;
#endif
#ifdef COFF_IMAGE_WITH_PE
      /* Reminder: s_paddr holds the virtual size of the section.  */
      if (coff_section_data (abfd, current) != NULL
          && pei_section_data (abfd, current) != NULL)
        section.s_paddr = pei_section_data (abfd, current)->virt_size;
      else
        section.s_paddr = 0;
#endif

      /* If this section has no size or is unloadable then the scnptr
         will be 0 too.  */
      if (current->size == 0
          || (current->flags & (SEC_LOAD | SEC_HAS_CONTENTS)) == 0)
        section.s_scnptr = 0;
      else
        section.s_scnptr = current->filepos;

      section.s_relptr = current->rel_filepos;
      section.s_lnnoptr = current->line_filepos;
      section.s_nreloc = current->reloc_count;
      section.s_nlnno = current->lineno_count;
#ifndef COFF_IMAGE_WITH_PE
      /* In PEI, relocs come in the .reloc section.  */
      if (current->reloc_count != 0)
        hasrelocs = TRUE;
#endif
      if (current->lineno_count != 0)
        haslinno = TRUE;
      if ((current->flags & SEC_DEBUGGING) != 0
          && ! is_reloc_section)
        hasdebug = TRUE;

#ifdef RS6000COFF_C
#ifndef XCOFF64
      /* Indicate the use of an XCOFF overflow section header.  */
      if (current->reloc_count >= 0xffff || current->lineno_count >= 0xffff)
        {
          section.s_nreloc = 0xffff;
          section.s_nlnno = 0xffff;
        }
#endif
#endif

      section.s_flags = sec_to_styp_flags (current->name, current->flags);

      if (!strcmp (current->name, _TEXT))
        text_sec = current;
      else if (!strcmp (current->name, _DATA))
        data_sec = current;
      else if (!strcmp (current->name, _BSS))
        bss_sec = current;

#ifdef I960
      section.s_align = (current->alignment_power
                         ? 1 << current->alignment_power
                         : 0);
#endif
#ifdef TIC80COFF
      /* TI COFF puts the alignment power in bits 8-11 of the flags.  */
      section.s_flags |= (current->alignment_power & 0xF) << 8;
#endif
#ifdef COFF_ENCODE_ALIGNMENT
      COFF_ENCODE_ALIGNMENT(section, current->alignment_power);
#endif

#ifdef COFF_IMAGE_WITH_PE
      /* Suppress output of the sections if they are null.  ld
         includes the bss and data sections even if there is no size
         assigned to them.  NT loader doesn't like it if these section
         headers are included if the sections themselves are not
         needed.  See also coff_compute_section_file_positions.  */
      if (section.s_size == 0)
        internal_f.f_nscns--;
      else
#endif
        {
          SCNHDR buff;
          bfd_size_type amt = bfd_coff_scnhsz (abfd);

          if (coff_swap_scnhdr_out (abfd, &section, &buff) == 0
              || bfd_bwrite (& buff, amt, abfd) != amt)
            return FALSE;
        }

#ifdef COFF_WITH_PE
      /* PE stores COMDAT section information in the symbol table.  If
         this section is supposed to have some COMDAT info, track down
         the symbol in the symbol table and modify it.  */
      if ((current->flags & SEC_LINK_ONCE) != 0)
        {
          unsigned int i, count;
          asymbol **psym;
          coff_symbol_type *csym = NULL;
          asymbol **psymsec;

          psymsec = NULL;
          count = bfd_get_symcount (abfd);
          for (i = 0, psym = abfd->outsymbols; i < count; i++, psym++)
            {
              if ((*psym)->section != current)
                continue;

              /* Remember the location of the first symbol in this
                 section.  */
              if (psymsec == NULL)
                psymsec = psym;

              /* See if this is the section symbol.  */
              if (strcmp ((*psym)->name, current->name) == 0)
                {
                  csym = coff_symbol_from (abfd, *psym);
                  if (csym == NULL
                      || csym->native == NULL
                      || csym->native->u.syment.n_numaux < 1
                      || csym->native->u.syment.n_sclass != C_STAT
                      || csym->native->u.syment.n_type != T_NULL)
                    continue;

                  /* Here *PSYM is the section symbol for CURRENT.  */

                  break;
                }
            }

          /* Did we find it?
             Note that we might not if we're converting the file from
             some other object file format.  */
          if (i < count)
            {
              combined_entry_type *aux;

              /* We don't touch the x_checksum field.  The
                 x_associated field is not currently supported.  */

              aux = csym->native + 1;
              switch (current->flags & SEC_LINK_DUPLICATES)
                {
                case SEC_LINK_DUPLICATES_DISCARD:
                  aux->u.auxent.x_scn.x_comdat = IMAGE_COMDAT_SELECT_ANY;
                  break;

                case SEC_LINK_DUPLICATES_ONE_ONLY:
                  aux->u.auxent.x_scn.x_comdat =
                    IMAGE_COMDAT_SELECT_NODUPLICATES;
                  break;

                case SEC_LINK_DUPLICATES_SAME_SIZE:
                  aux->u.auxent.x_scn.x_comdat =
                    IMAGE_COMDAT_SELECT_SAME_SIZE;
                  break;

                case SEC_LINK_DUPLICATES_SAME_CONTENTS:
                  aux->u.auxent.x_scn.x_comdat =
                    IMAGE_COMDAT_SELECT_EXACT_MATCH;
                  break;
                }

              /* The COMDAT symbol must be the first symbol from this
                 section in the symbol table.  In order to make this
                 work, we move the COMDAT symbol before the first
                 symbol we found in the search above.  It's OK to
                 rearrange the symbol table at this point, because
                 coff_renumber_symbols is going to rearrange it
                 further and fix up all the aux entries.  */
              if (psym != psymsec)
                {
                  asymbol *hold;
                  asymbol **pcopy;

                  hold = *psym;
                  for (pcopy = psym; pcopy > psymsec; pcopy--)