[deliverable/binutils-gdb.git] / bfd / coffcode.h

/* Support for the generic parts of most COFF variants, for BFD.
   Copyright 1990, 91, 92, 93, 94, 1995 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 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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
        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_linno_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 hierachy 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_slurp_symbol_table. *}
.unsigned int fix_scnlen : 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 ? *}
.boolean done_lineno;
.} coff_symbol_type;


*/

#ifndef IMAGE_BASE
#define IMAGE_BASE 0
#endif

#include "coffswap.h"
\f
/* void warning(); */

/*
 * 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 mirror the changes
 *      in styp_to_sec_flags().
 */
static long
sec_to_styp_flags (sec_name, sec_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;
#ifdef TWO_DATA_SECS
    }
  else if (!strcmp (sec_name, ".data2"))
    {
      styp_flags = STYP_DATA;
#endif /* TWO_DATA_SECS */
    }
  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 (!strcmp (sec_name, ".debug"))
    {
#ifdef STYP_DEBUG
      styp_flags = STYP_DEBUG;
#else
      styp_flags = STYP_INFO;
#endif
    }
  else if (!strncmp (sec_name, ".stab", 5))
    {
      styp_flags = STYP_INFO;
    }
  /* 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_NOLOAD
  if ((sec_flags & (SEC_NEVER_LOAD | SEC_COFF_SHARED_LIBRARY)) != 0)
    styp_flags |= STYP_NOLOAD;
#endif

  return (styp_flags);
}
/*
 * 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 mirror the changes
 *      in sec_to_styp_flags().
 */
static flagword
styp_to_sec_flags (abfd, hdr, name)
     bfd *abfd;
     PTR hdr;
     const char *name;
{
  struct internal_scnhdr *internal_s = (struct internal_scnhdr *) hdr;
  long styp_flags = internal_s->s_flags;
  flagword sec_flags = 0;

#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.  */
#ifdef COFF_PAGE_SIZE
      sec_flags |= SEC_DEBUGGING;
#endif
    }
  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
#ifdef TWO_DATA_SECS
           || strcmp (name, ".data2") == 0
#endif
           )
    {
      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 (strcmp (name, ".debug") == 0
#ifdef _COMMENT
           || strcmp (name, _COMMENT) == 0
#endif
           || strncmp (name, ".stab", 5) == 0)
    {
#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 */

  return (sec_flags);
}

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

/*
INTERNAL_DEFINITION
        bfd_coff_backend_data

CODE_FRAGMENT

Special entry points for gdb to swap in coff symbol table parts:
.typedef struct
.{
.  void (*_bfd_coff_swap_aux_in) PARAMS ((
.       bfd            *abfd,
.       PTR             ext,
.       int             type,
.       int             class,
.       int             indaux,
.       int             numaux,
.       PTR             in));
.
.  void (*_bfd_coff_swap_sym_in) PARAMS ((
.       bfd            *abfd ,
.       PTR             ext,
.       PTR             in));
.
.  void (*_bfd_coff_swap_lineno_in) PARAMS ((
.       bfd            *abfd,
.       PTR            ext,
.       PTR             in));
.

Special entry points for gas to swap out coff parts:

. unsigned int (*_bfd_coff_swap_aux_out) PARAMS ((
.       bfd     *abfd,
.       PTR     in,
.       int     type,
.       int     class,
.       int     indaux,
.       int     numaux,
.       PTR     ext));
.
. unsigned int (*_bfd_coff_swap_sym_out) PARAMS ((
.      bfd      *abfd,
.      PTR      in,
.      PTR      ext));
.
. unsigned int (*_bfd_coff_swap_lineno_out) PARAMS ((
.       bfd     *abfd,
.       PTR     in,
.       PTR     ext));
.
. unsigned int (*_bfd_coff_swap_reloc_out) PARAMS ((
.       bfd     *abfd,
.       PTR     src,
.       PTR     dst));
.
. unsigned int (*_bfd_coff_swap_filehdr_out) PARAMS ((
.       bfd     *abfd,
.       PTR     in,
.       PTR     out));
.
. unsigned int (*_bfd_coff_swap_aouthdr_out) PARAMS ((
.       bfd     *abfd,
.       PTR     in,
.       PTR     out));
.
. unsigned int (*_bfd_coff_swap_scnhdr_out) PARAMS ((
.       bfd     *abfd,
.       PTR     in,
.       PTR     out));
.

Special entry points for generic COFF routines to call target
dependent COFF routines:

. 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;
. boolean _bfd_coff_long_filenames;
. void (*_bfd_coff_swap_filehdr_in) PARAMS ((
.       bfd     *abfd,
.       PTR     ext,
.       PTR     in));
. void (*_bfd_coff_swap_aouthdr_in) PARAMS ((
.       bfd     *abfd,
.       PTR     ext,
.       PTR     in));
. void (*_bfd_coff_swap_scnhdr_in) PARAMS ((
.       bfd     *abfd,
.       PTR     ext,
.       PTR     in));
. void (*_bfd_coff_swap_reloc_in) PARAMS ((
.       bfd     *abfd,
.       PTR     ext,
.       PTR     in));
. boolean (*_bfd_coff_bad_format_hook) PARAMS ((
.       bfd     *abfd,
.       PTR     internal_filehdr));
. boolean (*_bfd_coff_set_arch_mach_hook) PARAMS ((
.       bfd     *abfd,
.       PTR     internal_filehdr));
. PTR (*_bfd_coff_mkobject_hook) PARAMS ((
.       bfd     *abfd,
.       PTR     internal_filehdr,
.       PTR     internal_aouthdr));
. flagword (*_bfd_styp_to_sec_flags_hook) PARAMS ((
.       bfd     *abfd,
.       PTR     internal_scnhdr,
.       const char *name));
. asection *(*_bfd_make_section_hook) PARAMS ((
.       bfd     *abfd,
.       char    *name));
. void (*_bfd_set_alignment_hook) PARAMS ((
.       bfd     *abfd,
.       asection *sec,
.       PTR     internal_scnhdr));
. boolean (*_bfd_coff_slurp_symbol_table) PARAMS ((
.       bfd     *abfd));
. boolean (*_bfd_coff_symname_in_debug) PARAMS ((
.       bfd     *abfd,
.       struct internal_syment *sym));
. void (*_bfd_coff_reloc16_extra_cases) PARAMS ((
.       bfd     *abfd,
.       struct bfd_link_info *link_info,
.       struct bfd_link_order *link_order,
.       arelent *reloc,
.       bfd_byte *data,
.       unsigned int *src_ptr,
.       unsigned int *dst_ptr));
. int (*_bfd_coff_reloc16_estimate) PARAMS ((
.       bfd *abfd,
.       asection *input_section,
.       arelent *r,
.       unsigned int shrink,
.       struct bfd_link_info *link_info));
. boolean (*_bfd_coff_sym_is_global) PARAMS ((
.       bfd *abfd,
.       struct internal_syment *));
. void (*_bfd_coff_compute_section_file_positions) PARAMS ((
.       bfd *abfd));
. boolean (*_bfd_coff_relocate_section) PARAMS ((
.       bfd *output_bfd,
.       struct bfd_link_info *info,
.       bfd *input_bfd,
.       asection *input_section,
.       bfd_byte *contents,
.       struct internal_reloc *relocs,
.       struct internal_syment *syms,
.       asection **sections));
. reloc_howto_type *(*_bfd_coff_rtype_to_howto) PARAMS ((
.       bfd *abfd,
.       asection *sec,
.       struct internal_reloc *rel,
.       struct coff_link_hash_entry *h,
.       struct internal_syment *sym,
.       bfd_vma *addendp));
. boolean (*_bfd_coff_adjust_symndx) PARAMS ((
.       bfd *obfd,
.       struct bfd_link_info *info,
.       bfd *ibfd,
.       asection *sec,
.       struct internal_reloc *reloc,
.       boolean *adjustedp));
.
.} 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_long_filenames(abfd) (coff_backend_info (abfd)->_bfd_coff_long_filenames)
.#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)\
.        ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook) (abfd, scnhdr, name))
.
.#define bfd_coff_make_section_hook(abfd, name)\
.        ((coff_backend_info (abfd)->_bfd_make_section_hook) (abfd, name))
.
.#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_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_sym_is_global(abfd, sym)\
.        ((coff_backend_info (abfd)->_bfd_coff_sym_is_global)\
.         (abfd, sym))
.
.#define bfd_coff_compute_section_file_positions(abfd)\
.        ((coff_backend_info (abfd)->_bfd_coff_compute_section_file_positions)\
.         (abfd))
.
.#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))
.
*/

/* See whether the magic number matches.  */

static boolean
coff_bad_format_hook (abfd, filehdr)
     bfd * abfd;
     PTR 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 && AOUTSZ != internal_f->f_opthdr)
    return false;
#endif

  return true;
}

static asection *
coff_make_section_hook (abfd, name)
     bfd * abfd;
     char *name;
{
#ifdef TWO_DATA_SECS
  /* FIXME: This predates the call to bfd_make_section_anyway
     in make_a_section_from_file, and can probably go away.  */
  /* On SCO a file created by the Microsoft assembler can have two
     .data sections.  We use .data2 for the second one.  */
  if (strcmp (name, _DATA) == 0)
    return bfd_make_section (abfd, ".data2");
#endif
  return (asection *) NULL;
}

/*
   initialize a section structure with information peculiar to this
   particular implementation of coff
*/

static boolean
coff_new_section_hook (abfd, section)
     bfd * abfd;
     asection * section;
{
  section->alignment_power = COFF_DEFAULT_SECTION_ALIGNMENT_POWER;

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

     @@ Shouldn't use constant multiplier here!  */
  coffsymbol (section->symbol)->native =
    (combined_entry_type *) bfd_zalloc (abfd,
                                        sizeof (combined_entry_type) * 10);

  /* The .stab section must be aligned to 2**2 at most, because
     otherwise there may be gaps in the section which gdb will not
     know how to interpret.  Examining the section name is a hack, but
     that is also how gdb locates the section.  We also align the
     .stabstr section this way for backward compatibility, although I
     believe it would work anyhow.  */
  if (COFF_DEFAULT_SECTION_ALIGNMENT_POWER > 2
      && (strncmp (section->name, ".stab", 5) == 0))
    section->alignment_power = 2;

  return true;
}

#ifdef I960

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

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

  for (i = 0; i < 32; i++)
    if ((1 << i) >= hdr->s_align)
      break;
  section->alignment_power = i;
}

#else /* ! I960 */

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

#endif /* ! I960 */

static boolean
coff_mkobject (abfd)
     bfd * abfd;
{
  coff_data_type *coff;

  abfd->tdata.coff_obj_data = (struct coff_tdata *) bfd_zalloc (abfd, sizeof (coff_data_type));
  if (abfd->tdata.coff_obj_data == 0)
    {
      bfd_set_error (bfd_error_no_memory);
      return false;
    }
  coff = coff_data (abfd);
  coff->symbols = (coff_symbol_type *) NULL;
  coff->conversion_table = (unsigned int *) NULL;
  coff->raw_syments = (struct coff_ptr_struct *) NULL;
  coff->relocbase = 0;
/*  make_abs_section(abfd);*/

#ifdef COFF_WITH_PE
  obj_pe (abfd) = 1;
#endif
  return true;
}

/* Create the COFF backend specific information.  */

static PTR
coff_mkobject_hook (abfd, filehdr, aouthdr)
     bfd * abfd;
     PTR filehdr;
     PTR aouthdr;
{
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
  coff_data_type *coff;

  if (coff_mkobject (abfd) == false)
    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 = SYMESZ;
  coff->local_auxesz = AUXESZ;
  coff->local_linesz = LINESZ;

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

  return (PTR) coff;
}

/* 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 boolean
coff_set_arch_mach_hook (abfd, filehdr)
     bfd *abfd;
     PTR filehdr;
{
  long machine;
  enum bfd_architecture arch;
  struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;

  machine = 0;
  switch (internal_f->f_magic)
    {
#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;
      machine = 0;
      break;
#endif
#ifdef A29K_MAGIC_BIG
    case A29K_MAGIC_BIG:
    case A29K_MAGIC_LITTLE:
      arch = bfd_arch_a29k;
      machine = 0;
      break;
#endif
#ifdef ARMMAGIC
    case ARMMAGIC:
      arch = bfd_arch_arm;
      machine =0;
      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 = 68020;
      break;
#endif
#ifdef MC88MAGIC
    case MC88MAGIC:
    case MC88DMAGIC:
    case MC88OMAGIC:
      arch = bfd_arch_m88k;
      machine = 88100;
      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 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;
          /* start-sanitize-i960xl */
        case F_I960XL:
          machine = bfd_mach_i960_xl;
          break;
          /* end-sanitize-i960xl */
        }
      break;
#endif
#endif

#ifdef U802ROMAGIC
    case U802ROMAGIC:
    case U802WRMAGIC:
    case U802TOCMAGIC:
      arch = bfd_arch_rs6000;
      machine = 6000;
      break;
#endif

#ifdef WE32KMAGIC
    case WE32KMAGIC:
      arch = bfd_arch_we32k;
      machine = 0;
      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 SH_ARCH_MAGIC_BIG
    case SH_ARCH_MAGIC_BIG:
    case SH_ARCH_MAGIC_LITTLE:
      arch = bfd_arch_sh;
      machine = 0;
      break;
#endif

#ifdef H8500MAGIC
    case H8500MAGIC:
      arch = bfd_arch_h8500;
      machine = 0;
      break;
#endif

#ifdef SPARCMAGIC
    case SPARCMAGIC:
#ifdef LYNXCOFFMAGIC
    case LYNXCOFFMAGIC:
#endif
      arch = bfd_arch_sparc;
      machine = 0;
      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 boolean
symname_in_debug_hook (abfd, sym)
     bfd * abfd;
     struct internal_syment *sym;
{
  return SYMNAME_IN_DEBUG (sym) ? true : false;
}

#else

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

#endif

/*
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.

*/

static boolean
coff_write_relocs (abfd, first_undef)
     bfd * abfd;
     int first_undef;
{
  asection *s;
  for (s = abfd->sections; s != (asection *) NULL; s = s->next)
    {
      unsigned int i;
      struct external_reloc dst;

      arelent **p = s->orelocation;
      if (bfd_seek (abfd, s->rel_filepos, SEEK_SET) != 0)
        return false;
      for (i = 0; i < s->reloc_count; i++)
        {
          struct internal_reloc n;
          arelent *q = p[i];
          memset ((PTR) & 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 i;
              const char *sname = q->sym_ptr_ptr[0]->name;
              asymbol **outsyms = abfd->outsymbols;
              for (i = first_undef; outsyms[i]; i++)
                {
                  const char *intable = outsyms[i]->name;
                  if (strcmp (intable, sname) == 0) {
                    /* got a hit, so repoint the reloc */
                    q->sym_ptr_ptr = outsyms + i;
                    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)
              {
                if (q->sym_ptr_ptr == bfd_abs_section_ptr->symbol_ptr_ptr)
                  /* This is a relocation relative to the absolute symbol.  */
                  n.r_symndx = -1;
                else
                  {
                    n.r_symndx = get_index ((*(q->sym_ptr_ptr)));
                    /* Take notice if the symbol reloc points to a symbol
                       we don't have in our symbol table.  What should we
                       do for this??  */
                    if (n.r_symndx > obj_conv_table_size (abfd))
                      abort ();
                  }
              }

#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_write ((PTR) & dst, 1, RELSZ, abfd) != RELSZ)
            return false;
        }
    }

  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 boolean
coff_set_flags (abfd, magicp, flagsp)
     bfd * abfd;
     unsigned *magicp;
     unsigned short *flagsp;
{
  switch (bfd_get_arch (abfd))
    {
#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;
        /*
          ((bfd_get_file_flags(abfd) & WP_TEXT) ? I960ROMAGIC :
          I960RWMAGIC);   FIXME???
          */
        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;
            /* start-sanitize-i960xl */
          case bfd_mach_i960_xl:
            flags = F_I960XL;
            break;
            /* end-sanitize-i960xl */
          default:
            return false;
          }
        *flagsp = flags;
        return true;
      }
      break;
#endif
#ifdef ARMMAGIC
    case bfd_arch_arm:
      *magicp = ARMMAGIC;
      return true;
#endif
#ifdef I386MAGIC
    case bfd_arch_i386:
      *magicp = I386MAGIC;
#ifdef LYNXOS
      /* Just overwrite the usual value if we're doing Lynx. */
      *magicp = LYNXCOFFMAGIC;
#endif
      return true;
      break;
#endif
#ifdef MC68MAGIC
    case bfd_arch_m68k:
#ifdef APOLLOM68KMAGIC
      *magicp = APOLLO_COFF_VERSION_NUMBER;
#else
      *magicp = MC68MAGIC;
#endif
#ifdef LYNXOS
      /* Just overwrite the usual value if we're doing Lynx. */
      *magicp = LYNXCOFFMAGIC;
#endif
      return true;
      break;
#endif

#ifdef MC88MAGIC
    case bfd_arch_m88k:
      *magicp = MC88OMAGIC;
      return true;
      break;
#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;
        }
      break;
#endif

#ifdef SH_ARCH_MAGIC_BIG
    case bfd_arch_sh:
      if (abfd->xvec->byteorder_big_p)
        *magicp = SH_ARCH_MAGIC_BIG;
      else
        *magicp = SH_ARCH_MAGIC_LITTLE;
      return true;
      break;
#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;
      break;
#endif

#ifdef H8500MAGIC
    case bfd_arch_h8500:
      *magicp = H8500MAGIC;
      return true;
      break;
#endif
#ifdef A29K_MAGIC_BIG
    case bfd_arch_a29k:
      if (abfd->xvec->byteorder_big_p)
        *magicp = A29K_MAGIC_BIG;
      else
        *magicp = A29K_MAGIC_LITTLE;
      return true;
      break;
#endif

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

#ifdef U802TOCMAGIC
    case bfd_arch_rs6000:
    case bfd_arch_powerpc:
      *magicp = U802TOCMAGIC;
      return true;
      break;
#endif

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

  return false;
}


static boolean
coff_set_arch_mach (abfd, arch, machine)
     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) != true)
    return false;               /* We can't represent this type */

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


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

static void
coff_compute_section_file_positions (abfd)
     bfd * abfd;
{
  asection *current;
  asection *previous = (asection *) NULL;
  file_ptr sofar = FILHSZ;
#ifndef I960
  file_ptr old_sofar;
#endif
  unsigned int count;

  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 += AOUTSZ;

  sofar += abfd->section_count * SCNHSZ;
  for (current = abfd->sections, count = 1;
       current != (asection *) NULL;
       current = current->next, ++count)
    {
      current->target_index = count;

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

#ifdef COFF_WITH_PE
      /* Do not include the .junk section.  This is where we collect section
         data which we don't need.  This is mainly the MS .debug$ data which
         stores codeview debug data. */
      if (strcmp (current->name, ".junk") == 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... */
#ifndef I960
      {
        /* make sure this section is aligned on the right boundary - by
         padding the previous section up if necessary */

        old_sofar = sofar;
        sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);
        if (previous != (asection *) NULL)
          {
            previous->_raw_size += sofar - old_sofar;
          }
      }

#endif

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

      current->filepos = sofar;

      sofar += current->_raw_size;
#ifndef I960
      /* make sure that this section is of the right size too */
      old_sofar = sofar;
      sofar = BFD_ALIGN (sofar, 1 << current->alignment_power);
      current->_raw_size += sofar - old_sofar;
#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;
    }
#ifdef COFF_WITH_PE
  /* Normally, the starting location for the symbol table will be at the end
     of the last section.  However, when dealing with NT, the last section
     must be as long as its size rounded up to the next page (0x1000). */
  sofar = ((sofar + NT_FILE_ALIGNMENT - 1) /
                           NT_FILE_ALIGNMENT) * NT_FILE_ALIGNMENT; 
#endif

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

}

#ifndef RS6000COFF_C

/* If .file, .text, .data, .bss symbols are missing, add them.  */
/* @@ Should we only be adding missing symbols, or overriding the aux
   values for existing section symbols?  */
static boolean
coff_add_missing_symbols (abfd)
     bfd *abfd;
{
  unsigned int nsyms = bfd_get_symcount (abfd);
  asymbol **sympp = abfd->outsymbols;
  asymbol **sympp2;
  unsigned int i;
  int need_text = 1, need_data = 1, need_bss = 1, need_file = 1;

  for (i = 0; i < nsyms; i++)
    {
      coff_symbol_type *csym = coff_symbol_from (abfd, sympp[i]);
      CONST char *name;
      if (csym)
        {
          /* only do this if there is a coff representation of the input
           symbol */
          if (csym->native && csym->native->u.syment.n_sclass == C_FILE)
            {
              need_file = 0;
              continue;
            }
          name = csym->symbol.name;
          if (!name)
            continue;
          if (!strcmp (name, _TEXT))
            need_text = 0;
#ifdef APOLLO_M68
          else if (!strcmp (name, ".wtext"))
            need_text = 0;
#endif
          else if (!strcmp (name, _DATA))
            need_data = 0;
          else if (!strcmp (name, _BSS))
            need_bss = 0;
        }
    }
  /* Now i == bfd_get_symcount (abfd).  */
  /* @@ For now, don't deal with .file symbol.  */
  need_file = 0;

  if (!need_text && !need_data && !need_bss && !need_file)
    return true;
  nsyms += need_text + need_data + need_bss + need_file;
  sympp2 = (asymbol **) bfd_alloc_by_size_t (abfd, nsyms * sizeof (asymbol *));
  if (!sympp2)
    {
      bfd_set_error (bfd_error_no_memory);
      return false;
    }
  memcpy (sympp2, sympp, i * sizeof (asymbol *));
  if (need_file)
    {
      /* @@ Generate fake .file symbol, in sympp2[i], and increment i.  */
      abort ();
    }
  if (need_text)
    sympp2[i++] = coff_section_symbol (abfd, _TEXT);
  if (need_data)
    sympp2[i++] = coff_section_symbol (abfd, _DATA);
  if (need_bss)
    sympp2[i++] = coff_section_symbol (abfd, _BSS);
  BFD_ASSERT (i == nsyms);
  bfd_set_symtab (abfd, sympp2, nsyms);
  return true;
}

#endif /* ! defined (RS6000COFF_C) */

#ifdef COFF_WITH_PE
static void add_data_entry (abfd, aout, idx, name)
     bfd *abfd;
     struct internal_aouthdr *aout;
     int idx;
     char *name;
{
  asection *sec = bfd_get_section_by_name (abfd, name);

  /* add import directory information if it exists */
  if (sec != NULL)
    {
      aout->DataDirectory[idx].VirtualAddress = sec->lma - NT_IMAGE_BASE;
      aout->DataDirectory[idx].Size = sec->_raw_size;
    }
}
#endif

/* SUPPRESS 558 */
/* SUPPRESS 529 */
static boolean
coff_write_object_contents (abfd)
     bfd * abfd;
{
  asection *current;
  boolean hasrelocs = false;
  boolean haslinno = false;
  file_ptr reloc_base;
  file_ptr lineno_base;
  file_ptr sym_base;
  unsigned long reloc_size = 0;
  unsigned long lnno_size = 0;
  asection *text_sec = NULL;
  asection *data_sec = NULL;
  asection *bss_sec = NULL;
  bfd_vma end_of_image = 0;

  struct internal_filehdr internal_f;
  struct internal_aouthdr internal_a;

  bfd_set_error (bfd_error_system_call);

  if (abfd->output_has_begun == false)
    coff_compute_section_file_positions (abfd);

  reloc_base = obj_relocbase (abfd);

  /* 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) * LINESZ;

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

  for (current = abfd->sections; current != NULL; current =
       current->next)
    reloc_size += current->reloc_count * RELSZ;

  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 * LINESZ;
        }
      else
        {
          current->line_filepos = 0;
        }
      if (current->reloc_count)
        {
          current->rel_filepos = reloc_base;
          reloc_base += current->reloc_count * RELSZ;
        }
      else
        {
          current->rel_filepos = 0;
        }
    }

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

#if 0 
  if (bfd_seek (abfd,
                (file_ptr) ((abfd->flags & EXEC_P) ?
                            (EXTRA_NT_HDRSZ + FILHSZ + AOUTSZ) : 
                            (EXTRA_NT_HDRSZ + FILHSZ)),
                SEEK_SET)
      != 0)
#else
    if (bfd_seek (abfd,
                  (file_ptr) ((abfd->flags & EXEC_P) ?
                              (FILHSZ + AOUTSZ) : FILHSZ),
                  SEEK_SET)
        != 0)
#endif
      return false;

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

#ifdef COFF_WITH_PE
        /* Do not include the .junk section.  This is where we collect section
           data which we don't need.  This is mainly the MS .debug$ data which
           stores codeview debug data. */
        if (strcmp (current->name, ".junk") == 0)
          {
            continue;
          }
#endif
        internal_f.f_nscns++;
        strncpy (&(section.s_name[0]), current->name, 8);
#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->lma;
        section.s_paddr = current->lma;
        section.s_size = current->_raw_size;

        /* Remember the address of the end of the last section */

        if (current->lma + current->_raw_size > end_of_image)
          end_of_image = current->lma + current->_raw_size ;

        /*
           If this section has no size or is unloadable then the scnptr
           will be 0 too
           */
        if (current->_raw_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;
        if (current->reloc_count != 0)
          hasrelocs = true;
        if (current->lineno_count != 0)
          haslinno = true;

        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;
#ifdef TWO_DATA_SECS
          }
        else if (!strcmp (current->name, ".data2"))
          {
            data_sec = current;
#endif /* TWO_DATA_SECS */
          }
        else if (!strcmp (current->name, _BSS))
          {
            bss_sec = current;
          }

#ifdef I960
        section.s_align = (current->alignment_power
                           ? 1 << current->alignment_power
                           : 0);

#endif
        {
          SCNHDR buff;

#ifdef WINDOWS_NT
          /* 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 */
          if (section.s_size == 0)
            internal_f.f_nscns--;
          else
            { 
              coff_swap_scnhdr_out (abfd, &section, &buff);
              if (bfd_write ((PTR) (&buff), 1, SCNHSZ, abfd) != SCNHSZ)
                return false;
            }
#else
          if (coff_swap_scnhdr_out (abfd, &section, &buff) == 0
              || bfd_write ((PTR) (&buff), 1, SCNHSZ, abfd) != SCNHSZ)
            return false;
#endif

        }
      }
  }


  /* OK, now set up the filehdr... */

  /* Don't include the internal abs section in the section count */

  /*
     We will NOT put a fucking timestamp in the header here. Every time you
     put it back, I will come in and take it out again.  I'm sorry.  This
     field does not belong here.  We fill it with a 0 so it compares the
     same but is not a reasonable time. -- gnu@cygnus.com
     */
  internal_f.f_timdat = 0;

  internal_f.f_flags = 0;

  if (abfd->flags & EXEC_P)
    internal_f.f_opthdr = AOUTSZ;
  else
    internal_f.f_opthdr = 0;

  if (!hasrelocs)
    internal_f.f_flags |= F_RELFLG;
  if (!haslinno)
    internal_f.f_flags |= F_LNNO;
  if (abfd->flags & EXEC_P)
    internal_f.f_flags |= F_EXEC;

  if (!abfd->xvec->byteorder_big_p)
    internal_f.f_flags |= F_AR32WR;
  else
    internal_f.f_flags |= F_AR32W;

#ifdef COFF_WITH_PE
  /* assign other filehdr fields for DOS header and NT signature */
  internal_f.e_magic    = DOSMAGIC;
  internal_f.e_cblp     = 0x90;
  internal_f.e_cp       = 0x3;
  internal_f.e_crlc     = 0x0;
  internal_f.e_cparhdr  = 0x4;
  internal_f.e_minalloc = 0x0;
  internal_f.e_maxalloc = 0xffff;
  internal_f.e_ss       = 0x0;
  internal_f.e_sp       = 0xb8;
  internal_f.e_csum     = 0x0;
  internal_f.e_ip       = 0x0;
  internal_f.e_cs       = 0x0;
  internal_f.e_lfarlc   = 0x40;
  internal_f.e_ovno     = 0x0;
  {
    int idx;
    for (idx=0; idx < 4; idx++)
      internal_f.e_res[idx] = 0x0;
  }
  internal_f.e_oemid   = 0x0;
  internal_f.e_oeminfo = 0x0;
  {
    int idx;
    for (idx=0; idx < 10; idx++)
      internal_f.e_res2[idx] = 0x0;
  }
  internal_f.e_lfanew = 0x80;

  /* this next collection of data are mostly just characters.  It appears
     to be constant within the headers put on NT exes */
  internal_f.dos_message[0]  = 0x0eba1f0e;
  internal_f.dos_message[1]  = 0xcd09b400;
  internal_f.dos_message[2]  = 0x4c01b821;
  internal_f.dos_message[3]  = 0x685421cd;
  internal_f.dos_message[4]  = 0x70207369;
  internal_f.dos_message[5]  = 0x72676f72;
  internal_f.dos_message[6]  = 0x63206d61;
  internal_f.dos_message[7]  = 0x6f6e6e61;
  internal_f.dos_message[8]  = 0x65622074;
  internal_f.dos_message[9]  = 0x6e757220;
  internal_f.dos_message[10] = 0x206e6920;
  internal_f.dos_message[11] = 0x20534f44;
  internal_f.dos_message[12] = 0x65646f6d;
  internal_f.dos_message[13] = 0x0a0d0d2e;
  internal_f.dos_message[14] = 0x24;
  internal_f.dos_message[15] = 0x0;
  internal_f.nt_signature = NT_SIGNATURE;
#endif


  /*
     FIXME, should do something about the other byte orders and
     architectures.
     */

  memset (&internal_a, 0, sizeof internal_a);

  /* Set up architecture-dependent stuff */

  {
    unsigned int magic = 0;
    unsigned short flags = 0;
    coff_set_flags (abfd, &magic, &flags);
    internal_f.f_magic = magic;
    internal_f.f_flags |= flags;
    /* ...and the "opt"hdr... */

#ifdef A29K
#ifdef ULTRA3                   /* NYU's machine */
    /* FIXME: This is a bogus check.  I really want to see if there
     * is a .shbss or a .shdata section, if so then set the magic
     * number to indicate a shared data executable.
     */
    if (internal_f.f_nscns >= 7)
      internal_a.magic = SHMAGIC; /* Shared magic */
    else
#endif /* ULTRA3 */
      internal_a.magic = NMAGIC; /* Assume separate i/d */
#define __A_MAGIC_SET__
#endif /* A29K */
#ifdef I960
    internal_a.magic = (magic == I960ROMAGIC ? NMAGIC : OMAGIC);
#define __A_MAGIC_SET__
#endif /* I960 */
#if M88
#define __A_MAGIC_SET__
    internal_a.magic = PAGEMAGICBCS;
#endif /* M88 */

#if APOLLO_M68
#define __A_MAGIC_SET__
    internal_a.magic = APOLLO_COFF_VERSION_NUMBER;
#endif

#if defined(M68) || defined(WE32K) || defined(M68K)
#define __A_MAGIC_SET__
#if defined(LYNXOS)
    internal_a.magic = LYNXCOFFMAGIC;
#endif /* LYNXOS */
#endif /* M68 || WE32K || M68K */

#if defined(ARM)
#define __A_MAGIC_SET__
    internal_a.magic = ZMAGIC;
#endif 
#if defined(I386)
#define __A_MAGIC_SET__
#if defined(LYNXOS)
    internal_a.magic = LYNXCOFFMAGIC;
#else  /* LYNXOS */
    internal_a.magic = ZMAGIC;
#endif /* LYNXOS */
#endif /* I386 */

#if defined(SPARC)
#define __A_MAGIC_SET__
#if defined(LYNXOS)
    internal_a.magic = LYNXCOFFMAGIC;
#endif /* LYNXOS */
#endif /* SPARC */

#if RS6000COFF_C
#define __A_MAGIC_SET__
    internal_a.magic = (abfd->flags & D_PAGED) ? RS6K_AOUTHDR_ZMAGIC :
    (abfd->flags & WP_TEXT) ? RS6K_AOUTHDR_NMAGIC :
    RS6K_AOUTHDR_OMAGIC;
#endif

#ifndef __A_MAGIC_SET__
#include "Your aouthdr magic number is not being set!"
#else
#undef __A_MAGIC_SET__
#endif
  }
  /* Now should write relocs, strings, syms */
  obj_sym_filepos (abfd) = sym_base;

  if (bfd_get_symcount (abfd) != 0)
    {
      int firstundef;
#ifndef RS6000COFF_C
      if (!coff_add_missing_symbols (abfd))
        return false;
#endif
      if (!coff_renumber_symbols (abfd, &firstundef))
        return false;
      coff_mangle_symbols (abfd);
      if (! coff_write_symbols (abfd))
        return false;
      if (! coff_write_linenumbers (abfd))
        return false;
      if (! coff_write_relocs (abfd, firstundef))
        return false;
    }

  /* If bfd_get_symcount (abfd) != 0, then we are not using the COFF
     backend linker, and obj_raw_syment_count is not valid until after
     coff_write_symbols is called.  */
  if (obj_raw_syment_count (abfd) != 0)
    internal_f.f_symptr = sym_base;
  else
    {
      internal_f.f_symptr = 0;
      internal_f.f_flags |= F_LSYMS;
    }

  if (text_sec)
    {
      internal_a.tsize = bfd_get_section_size_before_reloc (text_sec);
      internal_a.text_start = internal_a.tsize ? 
        (text_sec->vma - IMAGE_BASE) : 0;
    }
  if (data_sec)
    {
      internal_a.dsize = bfd_get_section_size_before_reloc (data_sec);
      internal_a.data_start = internal_a.dsize ? 
        (data_sec->vma - IMAGE_BASE) : 0;
    }
  if (bss_sec)
    {
      internal_a.bsize = bfd_get_section_size_before_reloc (bss_sec);
    }

  internal_a.entry = bfd_get_start_address (abfd) - IMAGE_BASE;
  internal_f.f_nsyms = obj_raw_syment_count (abfd);

#ifdef COFF_WITH_PE             /* write all of the other optional header data */
  /* Note; the entries for subsystem, stack reserve, stack commit, heap reserve
     and heap commit may be supplied on the command line via the -subsystem,
     -stack and/or -heap switches.  This data is initially stored in variable
     link_info.  This is eventually passed to the bfd (from ld) in (cofflink.c)
     _bfd_coff_final_link.  Once this function gets it, we copy it into variables
     NT_subsystem and NT_stack_heap which are defined in internal.h.  With
     respect to the stack/heap reserve/commit parameters, if nothing has been
     defined for these, the input values will be '0' (i.e. the values stored
     in NT_stack_heap) will be 0. */ 

  internal_a.ImageBase = NT_IMAGE_BASE; /* 0x400000 */
  internal_a.SectionAlignment = NT_SECTION_ALIGNMENT; /* 0x1000 */ 
  internal_a.FileAlignment = NT_FILE_ALIGNMENT; /* 0x200 */
  internal_a.MajorOperatingSystemVersion = 1;
  internal_a.MinorOperatingSystemVersion = 0;
  internal_a.MajorImageVersion = 0;
  internal_a.MinorImageVersion = 0;
  internal_a.MajorSubsystemVersion = 3;
  internal_a.MinorSubsystemVersion = 0xA;
  internal_a.Reserved1 = 0;
  /* Virtual start address, take virtual start address of last section, 
     add its physical size and round up the next page (NT_SECTION_ALIGNMENT).
     An assumption has been made that the sections stored in the abfd
     structure are in order and that I have successfully saved the last
     section's address and size. */

  internal_a.SizeOfImage = 
    (end_of_image - NT_IMAGE_BASE + NT_SECTION_ALIGNMENT - 1)
      & ~ (NT_SECTION_ALIGNMENT-1);

  /* Start of .text section will do here since it is the first section after
     the headers.  Note that NT_IMAGE_BASE has already been removed above */
  internal_a.SizeOfHeaders = internal_a.text_start; 
  internal_a.CheckSum = 0;
  switch (NT_subsystem)
    {
      /* The possible values are:
         1 - NATIVE   Doesn't require a subsystem
         2 - WINDOWS_GUI runs in Windows GUI subsystem
         3 - WINDOWS_CUI runs in Windows char sub. (console app)
         5 - OS2_CUI runs in OS/2 character subsystem
         7 - POSIX_CUI runs in Posix character subsystem */
    case native:
      internal_a.Subsystem = 1;
      break;
    case windows:
      internal_a.Subsystem = 2;
      break;
    case console:
      internal_a.Subsystem = 3;
      break;
    case os2:
      internal_a.Subsystem = 5;
      break;
    case posix:
      internal_a.Subsystem = 7;
      break;
    default:
      internal_a.Subsystem = 3;
    }
  internal_a.DllCharacteristics = 0;
  if (NT_stack_heap.stack_defined)
    {
      internal_a.SizeOfStackReserve = NT_stack_heap.stack_reserve;
      /* since commit is an optional parameter, verify that it is non-zero */
      if (NT_stack_heap.stack_commit > 0)
        internal_a.SizeOfStackCommit = NT_stack_heap.stack_commit;
      else
        internal_a.SizeOfStackCommit = NT_DEF_COMMIT;
    }
  else
    {
      internal_a.SizeOfStackReserve = NT_DEF_RESERVE; /* 0x100000 */
      internal_a.SizeOfStackCommit = NT_DEF_COMMIT; /* 0x1000 */
    }
  if (NT_stack_heap.heap_defined)
    {
      internal_a.SizeOfHeapReserve = NT_stack_heap.heap_reserve;
      /* since commit is an optional parameter, verify that it is non-zero */
      if (NT_stack_heap.heap_commit > 0)
        internal_a.SizeOfHeapCommit = NT_stack_heap.heap_commit;
      else
        internal_a.SizeOfHeapCommit = NT_DEF_COMMIT;
    }
  else
    {
      internal_a.SizeOfHeapReserve = NT_DEF_RESERVE; /* 0x100000 */
      internal_a.SizeOfHeapCommit = NT_DEF_COMMIT; /* 0x1000 */
    }
  internal_a.LoaderFlags = 0;
  internal_a.NumberOfRvaAndSizes = IMAGE_NUMBEROF_DIRECTORY_ENTRIES; /* 0x10 */

  /* first null out all data directory entries .. */
  memset (internal_a.DataDirectory, sizeof (internal_a.DataDirectory), 0);

  add_data_entry (abfd, &internal_a, 0, ".edata");
  add_data_entry (abfd, &internal_a, 1, ".idata");
  add_data_entry (abfd, &internal_a, 2, ".rsrc");
  add_data_entry (abfd, &internal_a, 5, ".reloc");



#endif

  /* now write them */
  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
    return false;
  {
    FILHDR buff;
    coff_swap_filehdr_out (abfd, (PTR) & internal_f, (PTR) & buff);
    if (bfd_write ((PTR) & buff, 1, FILHSZ, abfd) != FILHSZ)
      return false;
  }
  if (abfd->flags & EXEC_P)
    {
      AOUTHDR buff;
      coff_swap_aouthdr_out (abfd, (PTR) & internal_a, (PTR) & buff);
      if (bfd_write ((PTR) & buff, 1, AOUTSZ, abfd) != AOUTSZ)
        return false;
    }

  return true;
}

static boolean
coff_set_section_contents (abfd, section, location, offset, count)
     bfd * abfd;
     sec_ptr section;
     PTR location;
     file_ptr offset;
     bfd_size_type count;
{
  if (abfd->output_has_begun == false)  /* set by bfd.c handler */
    coff_compute_section_file_positions (abfd);

#ifdef _LIB
  /* If this is a .lib section, bump the vma address so that it
       winds up being the number of .lib sections output.  This is
       right for SVR3.2.  Shared libraries should probably get more
       generic support.  Ian Taylor <ian@cygnus.com>.  */
  if (strcmp (section->name, _LIB) == 0)
    ++section->lma;
#endif

  /* Don't write out bss sections - one way to do this is to
       see if the filepos has not been set. */
  if (section->filepos == 0)
    return true;

  if (bfd_seek (abfd, (file_ptr) (section->filepos + offset), SEEK_SET) != 0)
    return false;

  if (count != 0)
    {
      return (bfd_write (location, 1, count, abfd) == count) ? true : false;
    }
  return true;
}
#if 0
static boolean
coff_close_and_cleanup (abfd)
     bfd *abfd;
{
  if (!bfd_read_p (abfd))
    switch (abfd->format)
      {
      case bfd_archive:
        if (!_bfd_write_archive_contents (abfd))
          return false;
        break;
      case bfd_object:
        if (!coff_write_object_contents (abfd))
          return false;
        break;
      default:
        bfd_set_error (bfd_error_invalid_operation);
        return false;
      }

  /* We depend on bfd_close to free all the memory on the obstack.  */
  /* FIXME if bfd_release is not using obstacks! */
  return true;
}

#endif

static PTR
buy_and_read (abfd, where, seek_direction, size)
     bfd *abfd;
     file_ptr where;
     int seek_direction;
     size_t size;
{
  PTR area = (PTR) bfd_alloc (abfd, size);
  if (!area)
    {
      bfd_set_error (bfd_error_no_memory);
      return (NULL);
    }
  if (bfd_seek (abfd, where, seek_direction) != 0
      || bfd_read (area, 1, size, abfd) != size)
    return (NULL);
  return (area);
}                               /* buy_and_read() */

/*
SUBSUBSECTION
        Reading linenumbers

        Creating the linenumber table is done by reading in the entire
        coff linenumber table, and creating another table for internal use.

        A coff linenumber table is structured so that each function
        is marked as having a line number of 0. Each line within the
        function is an offset from the first line in the function. The
        base of the line number information for the table is stored in
        the symbol associated with the function.

        The information is copied from the external to the internal
        table, and each symbol which marks a function is marked by
        pointing its...

        How does this work ?

*/

static boolean
coff_slurp_line_table (abfd, asect)
     bfd *abfd;
     asection *asect;
{
  LINENO *native_lineno;
  alent *lineno_cache;

  BFD_ASSERT (asect->lineno == (alent *) NULL);

  native_lineno = (LINENO *) buy_and_read (abfd,
                                           asect->line_filepos,
                                           SEEK_SET,
                                           (size_t) (LINESZ *
                                                     asect->lineno_count));
  lineno_cache =
    (alent *) bfd_alloc (abfd, (size_t) ((asect->lineno_count + 1) * sizeof (alent)));
  if (lineno_cache == NULL)
    {
      bfd_set_error (bfd_error_no_memory);
      return false;
    }
  else
    {
      unsigned int counter = 0;
      alent *cache_ptr = lineno_cache;
      LINENO *src = native_lineno;

      while (counter < asect->lineno_count)
        {
          struct internal_lineno dst;
          coff_swap_lineno_in (abfd, src, &dst);
          cache_ptr->line_number = dst.l_lnno;

          if (cache_ptr->line_number == 0)
            {
              coff_symbol_type *sym =
              (coff_symbol_type *) (dst.l_addr.l_symndx
                      + obj_raw_syments (abfd))->u.syment._n._n_n._n_zeroes;
              cache_ptr->u.sym = (asymbol *) sym;
              sym->lineno = cache_ptr;
            }
          else
            {
              cache_ptr->u.offset = dst.l_addr.l_paddr
                - bfd_section_vma (abfd, asect);
            }                   /* If no linenumber expect a symbol index */

          cache_ptr++;
          src++;
          counter++;
        }
      cache_ptr->line_number = 0;

    }
  asect->lineno = lineno_cache;
  /* FIXME, free native_lineno here, or use alloca or something. */
  return true;
}

static boolean
coff_slurp_symbol_table (abfd)
     bfd * abfd;
{
  combined_entry_type *native_symbols;
  coff_symbol_type *cached_area;
  unsigned int *table_ptr;

  unsigned int number_of_symbols = 0;

  if (obj_symbols (abfd))
    return true;
  if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0)
    return false;

  /* Read in the symbol table */
  if ((native_symbols = coff_get_normalized_symtab (abfd)) == NULL)
    {
      return (false);
    }                           /* on error */

  /* Allocate enough room for all the symbols in cached form */
  cached_area = ((coff_symbol_type *)
                 bfd_alloc (abfd,
                            (obj_raw_syment_count (abfd)
                             * sizeof (coff_symbol_type))));

  if (cached_area == NULL)
    {
      bfd_set_error (bfd_error_no_memory);
      return false;
    }                           /* on error */
  table_ptr = ((unsigned int *)
               bfd_alloc (abfd,
                          (obj_raw_syment_count (abfd)
                           * sizeof (unsigned int))));

  if (table_ptr == NULL)
    {
      bfd_set_error (bfd_error_no_memory);
      return false;
    }
  else
    {
      coff_symbol_type *dst = cached_area;
      unsigned int last_native_index = obj_raw_syment_count (abfd);
      unsigned int this_index = 0;
      while (this_index < last_native_index)
        {
          combined_entry_type *src = native_symbols + this_index;
          table_ptr[this_index] = number_of_symbols;
          dst->symbol.the_bfd = abfd;

          dst->symbol.name = (char *) (src->u.syment._n._n_n._n_offset);
          /* We use the native name field to point to the cached field.  */
          src->u.syment._n._n_n._n_zeroes = (long) dst;
          dst->symbol.section = coff_section_from_bfd_index (abfd,
                                                     src->u.syment.n_scnum);
          dst->symbol.flags = 0;
          dst->done_lineno = false;

          switch (src->u.syment.n_sclass)
            {
#ifdef I960
            case C_LEAFEXT:
#if 0
              dst->symbol.value = src->u.syment.n_value - dst->symbol.section->vma;
              dst->symbol.flags = BSF_EXPORT | BSF_GLOBAL;
              dst->symbol.flags |= BSF_NOT_AT_END | BSF_FUNCTION;
#endif
              /* Fall through to next case */

#endif

            case C_EXT:
#ifdef RS6000COFF_C
            case C_HIDEXT:
#endif
#ifdef COFF_WITH_PE
            /* PE uses storage class 0x68 to denote a section symbol */
            case C_SECTION:
#endif
              if ((src->u.syment.n_scnum) == 0)
                {
                  if ((src->u.syment.n_value) == 0)
                    {
                      dst->symbol.section = bfd_und_section_ptr;
                      dst->symbol.value = 0;
                    }
                  else
                    {
                      dst->symbol.section = bfd_com_section_ptr;
                      dst->symbol.value = (src->u.syment.n_value);
                    }
                }
              else
                {
                  /*
            Base the value as an index from the base of the
            section
            */

                  dst->symbol.flags = BSF_EXPORT | BSF_GLOBAL;
                  dst->symbol.value = src->u.syment.n_value - dst->symbol.section->vma;

                  if (ISFCN ((src->u.syment.n_type)))
                    {
                      /*
              A function ext does not go at the end of a file
              */
                      dst->symbol.flags |= BSF_NOT_AT_END | BSF_FUNCTION;
                    }
                }

#ifdef RS6000COFF_C
              /* If this symbol has a csect aux of type LD, the scnlen field
           is actually the index of the containing csect symbol.  We
           need to pointerize it.  */
              if (src->u.syment.n_numaux > 0)
                {
                  combined_entry_type *aux;

                  aux = src + src->u.syment.n_numaux - 1;
                  if (SMTYP_SMTYP (aux->u.auxent.x_csect.x_smtyp) == XTY_LD)
                    {
                      aux->u.auxent.x_csect.x_scnlen.p =
                        native_symbols + aux->u.auxent.x_csect.x_scnlen.l;
                      aux->fix_scnlen = 1;
                    }
                }
#endif

              break;

            case C_STAT:        /* static                        */
#ifdef I960
            case C_LEAFSTAT:    /* static leaf procedure        */
#endif
            case C_LABEL:       /* label                         */
              if (src->u.syment.n_scnum == -2)
                dst->symbol.flags = BSF_DEBUGGING;
              else
                dst->symbol.flags = BSF_LOCAL;
              /*
          Base the value as an index from the base of the section, if
          there is one
          */
              if (dst->symbol.section)
                dst->symbol.value = (src->u.syment.n_value) -
                  dst->symbol.section->vma;
              else
                dst->symbol.value = (src->u.syment.n_value);
              break;

            case C_MOS: /* member of structure   */
            case C_EOS: /* end of structure              */
#ifdef NOTDEF                   /* C_AUTOARG has the same value */
#ifdef C_GLBLREG
            case C_GLBLREG:     /* A29k-specific storage class */
#endif
#endif
            case C_REGPARM:     /* register parameter            */
            case C_REG: /* register variable             */
#ifdef C_AUTOARG
            case C_AUTOARG:     /* 960-specific storage class */
#endif
            case C_TPDEF:       /* type definition               */
            case C_ARG:
            case C_AUTO:        /* automatic variable */
            case C_FIELD:       /* bit field */
            case C_ENTAG:       /* enumeration tag               */
            case C_MOE: /* member of enumeration         */
            case C_MOU: /* member of union               */
            case C_UNTAG:       /* union tag                     */
              dst->symbol.flags = BSF_DEBUGGING;
              dst->symbol.value = (src->u.syment.n_value);
              break;

            case C_FILE:        /* file name                     */
            case C_STRTAG:      /* structure tag                 */
#ifdef RS6000COFF_C
            case C_BINCL:       /* beginning of include file     */
            case C_EINCL:       /* ending of include file        */
            case C_GSYM:
            case C_LSYM:
            case C_PSYM:
            case C_RSYM:
            case C_RPSYM:
            case C_STSYM:
            case C_DECL:
            case C_ENTRY:
            case C_FUN:
            case C_ESTAT:
#endif
              dst->symbol.flags = BSF_DEBUGGING;
              dst->symbol.value = (src->u.syment.n_value);
              break;

#ifdef RS6000COFF_C
            case C_BSTAT:
              dst->symbol.flags = BSF_DEBUGGING;
              dst->symbol.value = src->u.syment.n_value;

              /* The value is actually a symbol index.  Save a pointer to
           the symbol instead of the index.  FIXME: This should use a
           union.  */
              src->u.syment.n_value =
                (long) (native_symbols + src->u.syment.n_value);
              src->fix_value = 1;
              break;
#endif

            case C_BLOCK:       /* ".bb" or ".eb"                */
            case C_FCN: /* ".bf" or ".ef"                */
            case C_EFCN:        /* physical end of function      */
              dst->symbol.flags = BSF_LOCAL;
              /*
          Base the value as an index from the base of the section
          */
              dst->symbol.value = (src->u.syment.n_value) - dst->symbol.section->vma;
              break;

            case C_NULL:
            case C_EXTDEF:      /* external definition           */
            case C_ULABEL:      /* undefined label               */
            case C_USTATIC:     /* undefined static              */
#ifndef COFF_WITH_PE
            /* C_LINE in regular coff is 0x68.  NT has taken over this storage
               class to represent a section symbol */
            case C_LINE:        /* line # reformatted as symbol table entry */
#endif
            case C_ALIAS:       /* duplicate tag                 */
            case C_HIDDEN:      /* ext symbol in dmert public lib */
            default:

              fprintf (stderr, "Unrecognized storage class %d (assuming debugging)\n  for %s symbol `%s'\n",
                       src->u.syment.n_sclass, dst->symbol.section->name,
                       dst->symbol.name);
/*      abort();*/
              dst->symbol.flags = BSF_DEBUGGING;
              dst->symbol.value = (src->u.syment.n_value);
              break;
            }

/*      BFD_ASSERT(dst->symbol.flags != 0);*/

          dst->native = src;

          dst->symbol.udata.i = 0;
          dst->lineno = (alent *) NULL;
          this_index += (src->u.syment.n_numaux) + 1;
          dst++;
          number_of_symbols++;
        }                       /* walk the native symtab */
    }                           /* bfdize the native symtab */

  obj_symbols (abfd) = cached_area;
  obj_raw_syments (abfd) = native_symbols;

  bfd_get_symcount (abfd) = number_of_symbols;
  obj_convert (abfd) = table_ptr;
  /* Slurp the line tables for each section too */
  {
    asection *p;
    p = abfd->sections;
    while (p)
      {
        coff_slurp_line_table (abfd, p);
        p = p->next;
      }
  }
  return true;
}                               /* coff_slurp_symbol_table() */

/* Check whether a symbol is globally visible.  This is used by the
   COFF backend linker code in cofflink.c, since a couple of targets
   have globally visible symbols which are not class C_EXT.  This
   function need not handle the case of n_class == C_EXT.  */

#undef OTHER_GLOBAL_CLASS

#ifdef I960
#define OTHER_GLOBAL_CLASS C_LEAFEXT
#endif

#ifdef RS6000COFF_C
#define OTHER_GLOBAL_CLASS C_HIDEXT
#endif

#ifdef COFF_WITH_PE
#define OTHER_GLOBAL_CLASS C_SECTION
#endif

#ifdef OTHER_GLOBAL_CLASS

static boolean
coff_sym_is_global (abfd, syment)
     bfd *abfd;
     struct internal_syment *syment;
{
  if (syment->n_sclass == OTHER_GLOBAL_CLASS)
    return true;
  return false;
}

#undef OTHER_GLOBAL_CLASS

#else /* ! defined (OTHER_GLOBAL_CLASS) */

/* sym_is_global should not be defined if it has nothing to do.  */

#define coff_sym_is_global 0

#endif /* ! defined (OTHER_GLOBAL_CLASS) */

/*
SUBSUBSECTION
        Reading relocations

        Coff relocations are easily transformed into the internal BFD form
        (@code{arelent}).

        Reading a coff relocation table is done in the following stages:

        o Read the entire coff relocation table into memory.

        o Process each relocation in turn; first swap it from the
        external to the internal form.

        o Turn the symbol referenced in the relocation's symbol index
        into a pointer into the canonical symbol table.
        This table is the same as the one returned by a call to
        @code{bfd_canonicalize_symtab}. The back end will call that
        routine and save the result if a canonicalization hasn't been done.

        o The reloc index is turned into a pointer to a howto
        structure, in a back end specific way. For instance, the 386
        and 960 use the @code{r_type} to directly produce an index
        into a howto table vector; the 88k subtracts a number from the
        @code{r_type} field and creates an addend field.


*/

#ifndef CALC_ADDEND
#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr)                \
  {                                                             \
    coff_symbol_type *coffsym = (coff_symbol_type *) NULL;      \
    if (ptr && bfd_asymbol_bfd (ptr) != abfd)                   \
      coffsym = (obj_symbols (abfd)                             \
                 + (cache_ptr->sym_ptr_ptr - symbols));         \
    else if (ptr)                                               \
      coffsym = coff_symbol_from (abfd, ptr);                   \
    if (coffsym != (coff_symbol_type *) NULL                    \
        && coffsym->native->u.syment.n_scnum == 0)              \
      cache_ptr->addend = 0;                                    \
    else if (ptr && bfd_asymbol_bfd (ptr) == abfd               \
             && ptr->section != (asection *) NULL)              \
      cache_ptr->addend = - (ptr->section->vma + ptr->value);   \
    else                                                        \
      cache_ptr->addend = 0;                                    \
  }
#endif

static boolean
coff_slurp_reloc_table (abfd, asect, symbols)
     bfd * abfd;
     sec_ptr asect;
     asymbol ** symbols;
{
  RELOC *native_relocs;
  arelent *reloc_cache;
  arelent *cache_ptr;

  unsigned int idx;

  if (asect->relocation)
    return true;
  if (asect->reloc_count == 0)
    return true;
  if (asect->flags & SEC_CONSTRUCTOR)
    return true;
  if (!coff_slurp_symbol_table (abfd))
    return false;
  native_relocs =
    (RELOC *) buy_and_read (abfd,
                            asect->rel_filepos,
                            SEEK_SET,
                            (size_t) (RELSZ *
                                      asect->reloc_count));
  reloc_cache = (arelent *)
    bfd_alloc (abfd, (size_t) (asect->reloc_count * sizeof (arelent)));

  if (reloc_cache == NULL)
    {
      bfd_set_error (bfd_error_no_memory);
      return false;
    }


  for (idx = 0; idx < asect->reloc_count; idx++)
    {
#ifdef RELOC_PROCESSING
      struct internal_reloc dst;
      struct external_reloc *src;

      cache_ptr = reloc_cache + idx;
      src = native_relocs + idx;
      coff_swap_reloc_in (abfd, src, &dst);

      RELOC_PROCESSING (cache_ptr, &dst, symbols, abfd, asect);
#else
      struct internal_reloc dst;
      asymbol *ptr;
      struct external_reloc *src;

      cache_ptr = reloc_cache + idx;
      src = native_relocs + idx;

      coff_swap_reloc_in (abfd, src, &dst);


      cache_ptr->address = dst.r_vaddr;

      if (dst.r_symndx != -1)
        {
          /* @@ Should never be greater than count of symbols!  */
          if (dst.r_symndx >= obj_conv_table_size (abfd))
            abort ();
          cache_ptr->sym_ptr_ptr = symbols + obj_convert (abfd)[dst.r_symndx];
          ptr = *(cache_ptr->sym_ptr_ptr);
        }
      else
        {
          cache_ptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
          ptr = 0;
        }

      /* The symbols definitions that we have read in have been
         relocated as if their sections started at 0. But the offsets
         refering to the symbols in the raw data have not been
         modified, so we have to have a negative addend to compensate.

         Note that symbols which used to be common must be left alone */

      /* Calculate any reloc addend by looking at the symbol */
      CALC_ADDEND (abfd, ptr, dst, cache_ptr);

      cache_ptr->address -= asect->vma;
/* !!     cache_ptr->section = (asection *) NULL;*/

      /* Fill in the cache_ptr->howto field from dst.r_type */
      RTYPE2HOWTO (cache_ptr, &dst);
#endif

    }

  asect->relocation = reloc_cache;
  return true;
}

#ifndef coff_rtype_to_howto
#ifdef RTYPE2HOWTO

/* Get the howto structure for a reloc.  This is only used if the file
   including this one defines coff_relocate_section to be
   _bfd_coff_generic_relocate_section, so it is OK if it does not
   always work.  It is the responsibility of the including file to
   make sure it is reasonable if it is needed.  */

static reloc_howto_type *coff_rtype_to_howto
  PARAMS ((bfd *, asection *, struct internal_reloc *,
           struct coff_link_hash_entry *, struct internal_syment *,
           bfd_vma *));

/*ARGSUSED*/
static reloc_howto_type *
coff_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
     bfd *abfd;
     asection *sec;
     struct internal_reloc *rel;
     struct coff_link_hash_entry *h;
     struct internal_syment *sym;
     bfd_vma *addendp;
{
  arelent genrel;

  RTYPE2HOWTO (&genrel, rel);
  return genrel.howto;
}

#else /* ! defined (RTYPE2HOWTO) */

#define coff_rtype_to_howto NULL

#endif /* ! defined (RTYPE2HOWTO) */
#endif /* ! defined (coff_rtype_to_howto) */

/* This is stupid.  This function should be a boolean predicate.  */
static long
coff_canonicalize_reloc (abfd, section, relptr, symbols)
     bfd * abfd;
     sec_ptr section;
     arelent ** relptr;
     asymbol ** symbols;
{
  arelent *tblptr = section->relocation;
  unsigned int count = 0;


  if (section->flags & SEC_CONSTRUCTOR)
    {
      /* this section has relocs made up by us, they are not in the
       file, so take them out of their chain and place them into
       the data area provided */
      arelent_chain *chain = section->constructor_chain;
      for (count = 0; count < section->reloc_count; count++)
        {
          *relptr++ = &chain->relent;
          chain = chain->next;
        }

    }
  else
    {
      if (! coff_slurp_reloc_table (abfd, section, symbols))
        return -1;

      tblptr = section->relocation;

      for (; count++ < section->reloc_count;)
        *relptr++ = tblptr++;


    }
  *relptr = 0;
  return section->reloc_count;
}

#ifdef GNU960
file_ptr
coff_sym_filepos (abfd)
     bfd *abfd;
{
  return obj_sym_filepos (abfd);
}
#endif

#ifndef coff_reloc16_estimate
#define coff_reloc16_estimate dummy_reloc16_estimate

static int
dummy_reloc16_estimate (abfd, input_section, reloc, shrink, link_info)
     bfd *abfd;
     asection *input_section;
     arelent *reloc;
     unsigned int shrink;
     struct bfd_link_info *link_info;
{
  abort ();
}

#endif

#ifndef coff_reloc16_extra_cases
#define coff_reloc16_extra_cases dummy_reloc16_extra_cases
/* This works even if abort is not declared in any header file.  */
static void
dummy_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,
                           dst_ptr)
     bfd *abfd;
     struct bfd_link_info *link_info;
     struct bfd_link_order *link_order;
     arelent *reloc;
     bfd_byte *data;
     unsigned int *src_ptr;
     unsigned int *dst_ptr;
{
  fprintf (stderr, "%s\n", reloc->howto->name);
  abort ();
}
#endif

/* If coff_relocate_section is defined, we can use the optimized COFF
   backend linker.  Otherwise we must continue to use the old linker.  */
#ifdef coff_relocate_section
#ifndef coff_bfd_link_hash_table_create
#define coff_bfd_link_hash_table_create _bfd_coff_link_hash_table_create
#endif
#ifndef coff_bfd_link_add_symbols
#define coff_bfd_link_add_symbols _bfd_coff_link_add_symbols
#endif
#ifndef coff_bfd_final_link
#define coff_bfd_final_link _bfd_coff_final_link
#endif
#else /* ! defined (coff_relocate_section) */
#define coff_relocate_section NULL
#define coff_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
#define coff_bfd_link_add_symbols _bfd_generic_link_add_symbols
#define coff_bfd_final_link _bfd_generic_final_link
#endif /* ! defined (coff_relocate_section) */
#define coff_bfd_link_split_section  _bfd_generic_link_split_section

#ifndef coff_adjust_symndx
#define coff_adjust_symndx NULL
#endif

static CONST bfd_coff_backend_data bfd_coff_std_swap_table =
{
  coff_swap_aux_in, coff_swap_sym_in, coff_swap_lineno_in,
  coff_swap_aux_out, coff_swap_sym_out,
  coff_swap_lineno_out, coff_swap_reloc_out,
  coff_swap_filehdr_out, coff_swap_aouthdr_out,
  coff_swap_scnhdr_out,
  FILHSZ, AOUTSZ, SCNHSZ, SYMESZ, AUXESZ, RELSZ, LINESZ,
#ifdef COFF_LONG_FILENAMES
  true,
#else
  false,
#endif
  coff_swap_filehdr_in, coff_swap_aouthdr_in, coff_swap_scnhdr_in,
  coff_swap_reloc_in, coff_bad_format_hook, coff_set_arch_mach_hook,
  coff_mkobject_hook, styp_to_sec_flags, coff_make_section_hook,
  coff_set_alignment_hook, coff_slurp_symbol_table, symname_in_debug_hook,
  coff_reloc16_extra_cases, coff_reloc16_estimate,
  coff_sym_is_global, coff_compute_section_file_positions,
  coff_relocate_section, coff_rtype_to_howto, coff_adjust_symndx
};

#define coff_close_and_cleanup _bfd_generic_close_and_cleanup
#define coff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
#define coff_get_section_contents _bfd_generic_get_section_contents

#define coff_bfd_copy_private_symbol_data \
  _bfd_generic_bfd_copy_private_symbol_data
#define coff_bfd_copy_private_section_data \
  _bfd_generic_bfd_copy_private_section_data
#define coff_bfd_copy_private_bfd_data _bfd_generic_bfd_copy_private_bfd_data
#define coff_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
#define coff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags

#ifndef coff_bfd_is_local_label
#define coff_bfd_is_local_label bfd_generic_is_local_label
#endif

/* The reloc lookup routine must be supplied by each individual COFF
   backend.  */
#ifndef coff_bfd_reloc_type_lookup
#define coff_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
#endif

#define coff_bfd_get_relocated_section_contents \
  bfd_generic_get_relocated_section_contents
#define coff_bfd_relax_section bfd_generic_relax_section