Wed Feb 3 09:14:36 1993 Ian Lance Taylor (ian@cygnus.com)

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

/* Support for the generic parts of most COFF variants, for BFD.
   Copyright 1990, 1991, 1992 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 difference between formats are the sizes and
        alignments of fields in structures on disk, and the occasional
        extra field.  

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

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

SUBSECTION
        Porting To A New Version of Coff

        The recommended method is to select from the existing
        implimentations the version of coff which is most like the one
        you want to use, for our purposes, we'll say that i386 coff is
        the one you select, and that your coff flavour is called foo.
        Copy the @code{i386coff.c} to @code{foocoff.c}, copy
        @code{../include/coff/i386.h} to @code{../include/coff/foo.h}
        and add the lines to @code{targets.c} and @code{Makefile.in}
        so that your new back end is used. Alter the shapes of the
        structures in @code{../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 @code{coff/internal.h} and
        @code{coffcode.h} if your version of coff is too wild. 

        You can verify that your new BFD backend works quite simply by
        building @code{objdump} from the @code{binutils} directory,
        and making sure that its version of what's going on at your
        host systems 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 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
        descibing the external layout of the structures. There is also
        an internal description of the coff layout (in
        @code{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
        @code{coffcode.h}. Eg 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 for 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.  This 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 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 changes 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 in 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 was born, 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. Note that 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 to an index into the symbol table of the symbol
        being referenced. 

        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 tabel to the file. 

*/

/*
INTERNAL_DEFINITION
        coff_symbol_type

DESCRIPTION
        The hidden information for an asymbol is described in a
        coff_ptr_struct, which is typedefed to 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 tag field of this symbol be renumbered.
.          Created by coff_pointerize_aux. *}
.char fix_tag;
.
.       {* Should the endidx field of this symbol be renumbered.
.          Created by coff_pointerize_aux. *}
.char fix_end;
.
.       {* 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;


*/

#include "seclet.h"
#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
DEFUN(sec_to_styp_flags, (sec_name, sec_flags),
        CONST char *            sec_name        AND
        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 */

  }
  /* 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 {
     styp_flags = STYP_BSS;
   }

#ifdef STYP_NOLOAD
  if (sec_flags & SEC_NEVER_LOAD)
   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
DEFUN(styp_to_sec_flags, (abfd, hdr),
      bfd *abfd AND
      PTR hdr)
{
  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_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_SHARED_LIBRARY;
    else
      sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC;
  }
  else if (styp_flags & STYP_BSS) 
  {
    sec_flags |= SEC_ALLOC;
  }
  else if (styp_flags & STYP_INFO) 
  {
    sec_flags |= SEC_NEVER_LOAD;
  }
  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)       ((int) (symbol)->udata)

/*
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 ,
.       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 coff parts

. unsigned int (*_bfd_coff_swap_aux_out) PARAMS ((
.       bfd     *abfd,
.       PTR     in,
.       int     type,
.       int     class,
.       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_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));
. 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));
. 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_seclet *seclet,
.       arelent *reloc,
.       bfd_byte *data,
.       unsigned int *src_ptr,
.       unsigned int *dst_ptr));
.} 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,i) \
.        ((coff_backend_info (a)->_bfd_coff_swap_aux_in) (a,e,t,c,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(abfd, i, t,c,o) \
.        ((coff_backend_info (abfd)->_bfd_coff_swap_aux_out) (abfd, i,t,c, 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_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_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)\
.        ((coff_backend_info (abfd)->_bfd_styp_to_sec_flags_hook) (abfd, scnhdr))
.
.#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, seclet, reloc, data, src_ptr, dst_ptr)\
.        ((coff_backend_info (abfd)->_bfd_coff_reloc16_extra_cases)\
.         (abfd, seclet, reloc, data, src_ptr, dst_ptr))
. 
*/

/* See whether the magic number matches.  */

static boolean
DEFUN(coff_bad_format_hook, (abfd, filehdr),
      bfd *abfd AND
      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 *
DEFUN (coff_make_section_hook, (abfd, name),
       bfd *abfd AND
       char *name)
{
#ifdef TWO_DATA_SECS
  /* 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
DEFUN(coff_new_section_hook,(abfd, section),
      bfd            *abfd AND
      asection       *section)
{
  section->alignment_power = abfd->xvec->align_power_min;
  /* 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);
  return true;
}


#ifdef I960

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

static void
DEFUN (coff_set_alignment_hook, (abfd, section, scnhdr),
       bfd *abfd AND
       asection *section AND
       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
DEFUN(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_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->raw_linenos = (struct lineno *) NULL;
  coff->relocbase = 0;
/*  make_abs_section(abfd);*/
  return true;
}

/* Create the COFF backend specific information.  */

static          PTR
DEFUN(coff_mkobject_hook,(abfd, filehdr, aouthdr),
      bfd            *abfd AND
      PTR            filehdr AND
      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;
  coff->flags = internal_f->f_flags;

  /* 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;

  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
DEFUN (coff_set_arch_mach_hook, (abfd, filehdr),
       bfd *abfd AND
       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:
#ifdef I386AIXMAGIC
  case I386AIXMAGIC:            /* Danbury PS/2 AIX C Compiler */
#endif
    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 MC68MAGIC
  case MC68MAGIC:
  case M68MAGIC:
    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;
        }
    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 = 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
DEFUN (symname_in_debug_hook, (abfd, sym),
       bfd *abfd AND
       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, all the back end does is step 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 and 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 void
DEFUN(coff_write_relocs,(abfd),
      bfd            *abfd)
{
  asection       *s;
  for (s = abfd->sections; s != (asection *) NULL; s = s->next) {
    unsigned int    i;
    struct external_reloc dst;

    arelent       **p = s->orelocation;
    bfd_seek(abfd, s->rel_filepos, SEEK_SET);
    for (i = 0; i < s->reloc_count; i++) {
      struct internal_reloc    n;
      arelent        *q = p[i];
      memset((PTR)&n, 0, sizeof(n));

      n.r_vaddr = q->address + s->vma;
      /* 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 */
#ifdef R_IHCONST                       
      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.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 SELECT_RELOC
      /* Work out reloc type from what is required */
      SELECT_RELOC(n.r_type, q->howto);
#else
      n.r_type = q->howto->type;
#endif
      coff_swap_reloc_out(abfd, &n, &dst);
      bfd_write((PTR) &dst, 1, RELSZ, abfd);
    }
  }
}

/* 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
DEFUN(coff_set_flags,(abfd, magicp, flagsp),
      bfd            *abfd AND
      unsigned       *magicp AND
      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;
        default:
          return false;
        }
        *flagsp = flags;
        return true;
      }
    break;
#endif
#ifdef I386MAGIC
  case bfd_arch_i386:
    *magicp = I386MAGIC;
    return true;
    break;
#endif
#ifdef MC68MAGIC
  case bfd_arch_m68k:
    *magicp = MC68MAGIC;
    return true;
    break;
#endif

#ifdef MC88MAGIC
    case bfd_arch_m88k:
      *magicp = MC88OMAGIC;
      return true;
      break;
#endif
#ifdef H8300MAGIC
    case bfd_arch_h8300:
      *magicp = H8300MAGIC;
      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:
    *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
DEFUN(coff_set_arch_mach,(abfd, arch, machine),
      bfd            *abfd AND
      enum bfd_architecture arch AND
      unsigned long   machine)
{
  unsigned        dummy1;
  unsigned     short dummy2;
  bfd_default_set_arch_mach(abfd, arch, machine);

  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
DEFUN(coff_compute_section_file_positions,(abfd),
      bfd            *abfd)
{
  asection       *current;
  asection      *previous = (asection *)NULL;
  file_ptr        sofar = FILHSZ;
  file_ptr      old_sofar;
  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;
       current != (asection *)NULL;
       current = current->next) {

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

      /* 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
      /* FIXME, in demand paged files, the low order bits of the file
         offset must match the low order bits of the virtual address.
         "Low order" is apparently implementation defined.  Add code
         here to round sofar up to match the virtual address.  */

      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

      previous = current;
    }
  obj_relocbase(abfd) = sofar;
}

/* 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 void
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;
        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;
  nsyms += need_text + need_data + need_bss + need_file;
  sympp2 = (asymbol**) bfd_alloc_by_size_t (abfd, nsyms * sizeof (asymbol *));
  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);
}

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

  struct internal_filehdr internal_f;
  struct internal_aouthdr internal_a;


  bfd_error = system_call_error;
  /* Number the output sections, starting from one on the first section
     with a name which doesn't start with a *.
     @@ The code doesn't make this check.  Is it supposed to be done,
     or isn't it??  */
  count = 1;
  for (current = abfd->sections; current != (asection *)NULL; 
       current = current->next) 
  {
      current->target_index = count;
      count++;
  }

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

  if (abfd->sections != (asection *)NULL) {
      scn_base = abfd->sections->filepos;
    }
  else {
      scn_base = 0;
    }
  if (bfd_seek(abfd, scn_base, SEEK_SET) != 0)
   return false;
  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;
  data_base = scn_base;

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

  for (current = abfd->sections; current != NULL; current =
       current->next) 
  {
    /* We give section headers to +ve indexes */
    if (current->target_index > 0) 
    {
        
      reloc_size += current->reloc_count * RELSZ;
      data_base += SCNHSZ;
    }
      
  }

  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->target_index > 0) 
    {
        
      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;
  bfd_seek(abfd,
           (file_ptr) ((abfd->flags & EXEC_P) ?
                       (FILHSZ + AOUTSZ) : FILHSZ),
           SEEK_SET);

{
#if 0
  unsigned int    pad = abfd->flags & D_PAGED ? data_base : 0;
#endif
  unsigned int    pad = 0;

  for (current = abfd->sections;
       current != NULL;
       current = current->next) {
      struct internal_scnhdr section;
      if (current->target_index > 0) 
      {
        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->vma + pad;
        section.s_paddr = current->vma + pad;
        section.s_size = current->_raw_size - pad;
        /*
          If this section has no size or is unloadable then the scnptr
          will be 0 too
          */
        if (current->_raw_size - pad == 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;

        coff_swap_scnhdr_out(abfd, &section, &buff);
        bfd_write((PTR) (&buff), 1, SCNHSZ, abfd);

      }

        pad = 0;
      }
    }   
}


  /* 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;

  if (bfd_get_symcount(abfd) != 0)
   internal_f.f_symptr = sym_base;
  else
   internal_f.f_symptr = 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 (0 == bfd_get_symcount(abfd))
   internal_f.f_flags |= F_LSYMS;
  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;

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

  /* 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 M68 || WE32K
#define __A_MAGIC_SET__
  /* Never was anything here for the 68k */
#endif                          /* M68 || WE32K */

#if I386
# define __A_MAGIC_SET__
  internal_a.magic = ZMAGIC;
#endif /* I386 */

#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) {
      coff_add_missing_symbols (abfd);
      coff_renumber_symbols(abfd);
      coff_mangle_symbols(abfd);
      coff_write_symbols(abfd);
      coff_write_linenumbers(abfd);
      coff_write_relocs(abfd);
    }
  if (text_sec) {
      internal_a.tsize = bfd_get_section_size_before_reloc(text_sec);
      internal_a.text_start = internal_a.tsize ? text_sec->vma : 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      : 0;
    }
  if (bss_sec) {
      internal_a.bsize = bfd_get_section_size_before_reloc(bss_sec);
    }

  internal_a.entry = bfd_get_start_address(abfd);
  internal_f.f_nsyms =  bfd_get_symcount(abfd);

  /* 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);
  bfd_write((PTR) &buff, 1, FILHSZ, abfd);
}
  if (abfd->flags & EXEC_P) {
      AOUTHDR buff;
      coff_swap_aouthdr_out(abfd, (PTR)&internal_a, (PTR)&buff);
      bfd_write((PTR) &buff, 1, AOUTSZ, abfd);
    }
  return true;
}

static          boolean
DEFUN(coff_set_section_contents,(abfd, section, location, offset, count),
      bfd            *abfd AND
      sec_ptr         section AND
      PTR             location AND
      file_ptr        offset AND
      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->vma;
#endif

    bfd_seek(abfd, (file_ptr) (section->filepos + offset), SEEK_SET);

    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_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_error = no_memory;
        return (NULL);
    }
    bfd_seek(abfd, where, seek_direction);
    if (bfd_read(area, 1, size, abfd) != size) {
        bfd_error = system_call_error;
        return (NULL);
    }                           /* on error */
    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 line number 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_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;
  }                             /* coff_slurp_line_table() */

static          boolean
DEFUN(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;
  bfd_seek(abfd, obj_sym_filepos(abfd), SEEK_SET);

  /* 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, (size_t) (bfd_get_symcount(abfd) * sizeof(coff_symbol_type)));

  if (cached_area == NULL) {
    bfd_error = no_memory;
    return false;
  }                             /* on error */
  table_ptr =
    (unsigned int *)
      bfd_alloc(abfd, (size_t) (bfd_get_symcount(abfd) * sizeof(unsigned int)));

  if (table_ptr == NULL) {
    bfd_error = no_memory;
    return false;
  } 
  else 
  {
    coff_symbol_type *dst = cached_area;
    unsigned int    last_native_index = bfd_get_symcount(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 = (int) 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;
#endif
        /* Fall through to next case */

#endif

      case C_EXT:
#ifdef RS6000COFF_C
      case C_HIDEXT:
#endif
        if ((src->u.syment.n_scnum) == 0) {
          if ((src->u.syment.n_value) == 0) {
            dst->symbol.section = &bfd_und_section;
            dst->symbol.value= 0;
          }
          else {
            dst->symbol.section = &bfd_com_section;
            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;
          }
        }


        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_BSTAT:
      case C_ESTAT:
#endif
        dst->symbol.flags = BSF_DEBUGGING;
        dst->symbol.value = (src->u.syment.n_value);
        break;

      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              */
      case C_LINE:              /* line # reformatted as symbol table entry */
      case C_ALIAS:             /* duplicate tag                 */
      case C_HIDDEN:            /* ext symbol in dmert public lib */
      default:

        fprintf(stderr,"Unrecognized storage class %d\n",
                                src->u.syment.n_sclass);
/*      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 = 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;

  obj_conv_table_size (abfd) = bfd_get_symcount (abfd);
  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() */

/*
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 The entire coff relocation table is read into memory.

        o Each relocation is processed in turn, first it is swapped from the
        external to the internal form.

        o The symbol referenced in the relocation's symbol index is
        turned intoa pointer into the canonical symbol table. Note
        that this table is the same as the one returned by a call to
        @code{bfd_canonicalize_symtab}. The back end will call the
        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)        \
            if (ptr && bfd_asymbol_bfd(ptr) == abfd             \
                && ((ptr->flags & BSF_OLD_COMMON)== 0)) \
            {                                           \
                cache_ptr->addend = -(ptr->section->vma + ptr->value);  \
            }                                           \
            else {                                      \
                cache_ptr->addend = 0;                  \
            }                   
#endif

static          boolean
DEFUN(coff_slurp_reloc_table,(abfd, asect, symbols),
      bfd            *abfd AND
      sec_ptr         asect AND
      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_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;
      bfd_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;

      bfd_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.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;
}


/* This is stupid.  This function should be a boolean predicate */
static unsigned int
DEFUN(coff_canonicalize_reloc, (abfd, section, relptr, symbols),
bfd            *abfd AND
sec_ptr         section AND
arelent       **relptr AND
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 
  { 
    coff_slurp_reloc_table(abfd, section, symbols);


    tblptr = section->relocation;
    if (!tblptr)
     return 0;

    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_extra_cases
#define coff_reloc16_extra_cases \
  (void (*) PARAMS ((bfd *, bfd_seclet_type *, arelent *, bfd_byte *,\
                     unsigned int *, unsigned int *))) abort
#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, LINESZ,
#ifdef COFF_LONG_FILENAMES
 true,
#else
 false,
#endif
 coff_swap_filehdr_in, coff_swap_aouthdr_in, coff_swap_scnhdr_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
};

#define coff_core_file_failing_command  _bfd_dummy_core_file_failing_command
#define coff_core_file_failing_signal   _bfd_dummy_core_file_failing_signal
#define coff_core_file_matches_executable_p     _bfd_dummy_core_file_matches_executable_p
#define coff_slurp_armap                bfd_slurp_coff_armap
#define coff_slurp_extended_name_table  _bfd_slurp_extended_name_table
#define coff_truncate_arname            bfd_dont_truncate_arname
#define coff_openr_next_archived_file   bfd_generic_openr_next_archived_file
#define coff_generic_stat_arch_elt      bfd_generic_stat_arch_elt
#define coff_get_section_contents       bfd_generic_get_section_contents
#define coff_close_and_cleanup          bfd_generic_close_and_cleanup

#define coff_bfd_debug_info_start       bfd_void
#define coff_bfd_debug_info_end         bfd_void
#define coff_bfd_debug_info_accumulate  \
                        (void (*) PARAMS ((bfd *, struct sec *))) bfd_void
#define coff_bfd_get_relocated_section_contents  bfd_generic_get_relocated_section_contents
#define coff_bfd_relax_section          bfd_generic_relax_section
#define coff_bfd_seclet_link            bfd_generic_seclet_link