source: branches/GNU/src/binutils/bfd/som.h@ 1467

/* HP PA-RISC SOM object file format:  definitions internal to BFD.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2001,
   2002 Free Software Foundation, Inc.

   Contributed by the Center for Software Science at the
   University of Utah ([email protected]).

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

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

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

#ifndef _SOM_H
#define _SOM_H

#include "libhppa.h"

/* Enable PA2.0 if available */
#define PA_2_0

#include <a.out.h>
#include <lst.h>
#include <ar.h>

/* The SOM BFD backend doesn't currently use anything from these
   two include files, but it's likely to need them in the future.  */
#ifdef R_DLT_REL
#include <shl.h>
#include <dl.h>
#endif

#if defined(HOST_HPPABSD) || defined (HOST_HPPAOSF)
/* BSD uses a completely different scheme for object file identification.
   so for now, define _PA_RISC_ID to accept any random value for a model
   number.  */
#undef _PA_RISC_ID
#define _PA_RISC_ID(__m_num) 1
#endif /* HOST_HPPABSD */

#define FILE_HDR_SIZE sizeof (struct header)
#define AUX_HDR_SIZE sizeof (struct som_exec_auxhdr)

typedef struct som_symbol
  {
    asymbol symbol;
    unsigned int som_type;

    /* Structured like the ELF tc_data union.  Allows more code sharing
       in GAS this way.  */
    union
      {
        struct
        {
          unsigned int hppa_arg_reloc;
          unsigned int hppa_priv_level;
        } ap;
        PTR any;
      }
    tc_data;

    /* Index of this symbol in the symbol table.  Only used when
       building relocation streams for incomplete objects.  */
    int index;

    /* How many times this symbol is used in a relocation.  By sorting
       the symbols from most used to least used we can significantly
       reduce the size of the relocation stream for incomplete objects.  */
    int reloc_count;

    /* During object file writing, the offset of the name of this symbol
       in the SOM string table.  */
    int stringtab_offset;
  }
som_symbol_type;

/* A structure containing all the magic information stored in a BFD's
   private data which needs to be copied during an objcopy/strip run.  */
struct som_exec_data
  {
    /* Sort-of a magic number.  BSD uses it to distinguish between
       native executables and hpux executables.  */
    short system_id;

    /* Magic exec flags.  These control things like whether or not
       null pointer dereferencing is allowed and the like.  */
    long exec_flags;

    /* We must preserve the version identifier too.  Some versions
       of the HP linker do not grok NEW_VERSION_ID for reasons unknown.  */
    unsigned int version_id;

    /* Add more stuff here as needed.  Good examples of information
       we might want to pass would be presumed_dp, entry_* and maybe
       others from the file header.  */
  };

struct somdata
  {
    /* All the magic information about an executable which lives
       in the private BFD structure and needs to be copied from
       the input bfd to the output bfd during an objcopy/strip.  */
    struct som_exec_data *exec_data;

    /* These three fields are only used when writing files and are
       generated from scratch.  They need not be copied for objcopy
       or strip to work.  */
    struct header *file_hdr;
    struct copyright_aux_hdr *copyright_aux_hdr;
    struct user_string_aux_hdr *version_aux_hdr;
    struct som_exec_auxhdr *exec_hdr;
    COMPUNIT *comp_unit;

    /* Pointers to a saved copy of the symbol and string tables.  These
       need not be copied for objcopy or strip to work.  */
    som_symbol_type *symtab;
    char *stringtab;
    asymbol **sorted_syms;

    /* We remember these offsets so that after check_file_format, we have
       no dependencies on the particular format of the exec_hdr.
       These offsets need not be copied for objcopy or strip to work.  */

    file_ptr sym_filepos;
    file_ptr str_filepos;