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/* BFD backend for core files which use the ptrace_user structure

   Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002

   Free Software Foundation, Inc.

   The structure of this file is based on trad-core.c written by John Gilmore

   of Cygnus Support.

   Modified to work with the ptrace_user structure by Kevin A. Buettner.

   (Longterm it may be better to merge this file with trad-core.c)

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.  */

#ifdef PTRACE_CORE

#include "bfd.h"

#include "sysdep.h"

#include "libbfd.h"

#include <sys/param.h>

#include <sys/dir.h>

#include <signal.h>

#include <sys/ptrace.h>

struct trad_core_struct

  {

    asection *data_section;

    asection *stack_section;

    asection *reg_section;

    struct ptrace_user u;

  };

#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))

#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)

#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)

#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)

/* forward declarations */

const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd));

char *          ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd));

int             ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd));

boolean         ptrace_unix_core_file_matches_executable_p

                         PARAMS ((bfd *core_bfd, bfd *exec_bfd));

static void     swap_abort PARAMS ((void));

/* ARGSUSED */

const bfd_target *

ptrace_unix_core_file_p (abfd)

     bfd *abfd;

{

  int val;

  struct ptrace_user u;

  struct trad_core_struct *rawptr;

  bfd_size_type amt;

  val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);

  if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC

      || u.pt_rev != _BCS_PTRACE_REV)

    {

      /* Too small to be a core file */

      bfd_set_error (bfd_error_wrong_format);

      return 0;

    }

  /* OK, we believe you.  You're a core file (sure, sure).  */

  /* Allocate both the upage and the struct core_data at once, so

     a single free() will free them both.  */

  amt = sizeof (struct trad_core_struct);

  rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);

  if (rawptr == NULL)

    return 0;

  abfd->tdata.trad_core_data = rawptr;

  rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */

  /* Create the sections.  */

  core_stacksec (abfd) = bfd_make_section_anyway (abfd, ".stack");

  if (core_stacksec (abfd) == NULL)

    goto fail;

  core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data");

  if (core_datasec (abfd) == NULL)

    goto fail;

  core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg");

  if (core_regsec (abfd) == NULL)

    goto fail;

  /* FIXME:  Need to worry about shared memory, library data, and library

     text.  I don't think that any of these things are supported on the

     system on which I am developing this for though.  */

  core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;

  core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;

  core_regsec (abfd)->flags = SEC_HAS_CONTENTS;

  core_datasec (abfd)->_raw_size =  u.pt_dsize;

  core_stacksec (abfd)->_raw_size = u.pt_ssize;

  core_regsec (abfd)->_raw_size = sizeof (u);

  core_datasec (abfd)->vma = u.pt_o_data_start;

  core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;

  core_regsec (abfd)->vma = 0 - sizeof (u);      /* see trad-core.c */

  core_datasec (abfd)->filepos = (int) u.pt_dataptr;

  core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);

  core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */

  /* Align to word at least */

  core_stacksec (abfd)->alignment_power = 2;

  core_datasec (abfd)->alignment_power = 2;

  core_regsec (abfd)->alignment_power = 2;

  return abfd->xvec;

 fail:

  bfd_release (abfd, abfd->tdata.any);

  abfd->tdata.any = NULL;

  bfd_section_list_clear (abfd);

  return NULL;

}

char *

ptrace_unix_core_file_failing_command (abfd)

     bfd *abfd;

{

  char *com = abfd->tdata.trad_core_data->u.pt_comm;

  if (*com)

    return com;

  else

    return 0;

}

/* ARGSUSED */

int

ptrace_unix_core_file_failing_signal (abfd)

     bfd *abfd;

{

  return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;

}

/* ARGSUSED */

boolean

ptrace_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)

     bfd *core_bfd, *exec_bfd;

{

  /* FIXME: Use pt_timdat field of the ptrace_user structure to match

     the date of the executable */

  return true;

}

/* If somebody calls any byte-swapping routines, shoot them.  */

static void

swap_abort ()

{

  abort (); /* This way doesn't require any declaration for ANSI to fuck up */

}

#define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )

#define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )

#define NO_SIGNED_GET \

  ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )

const bfd_target ptrace_core_vec =

  {

    "trad-core",

    bfd_target_unknown_flavour,

    BFD_ENDIAN_UNKNOWN,         /* target byte order */

    BFD_ENDIAN_UNKNOWN,         /* target headers byte order */

    (HAS_RELOC | EXEC_P |       /* object flags */

     HAS_LINENO | HAS_DEBUG |

     HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),

    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */

    0,                                                      /* symbol prefix */

    ' ',                                                   /* ar_pad_char */

    16,                                                    /* ar_max_namelen */

    NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */

    NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */

    NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */

    NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */

    NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */

    NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */

    {                           /* bfd_check_format */

     _bfd_dummy_target,         /* unknown format */

     _bfd_dummy_target,         /* object file */

     _bfd_dummy_target,         /* archive */

     ptrace_unix_core_file_p    /* a core file */

    },

    {                           /* bfd_set_format */

     bfd_false, bfd_false,

     bfd_false, bfd_false

    },

    {                           /* bfd_write_contents */

     bfd_false, bfd_false,

     bfd_false, bfd_false

    },

       BFD_JUMP_TABLE_GENERIC (_bfd_generic),

       BFD_JUMP_TABLE_COPY (_bfd_generic),

       BFD_JUMP_TABLE_CORE (ptrace_unix),

       BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),

       BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),

       BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),

       BFD_JUMP_TABLE_WRITE (_bfd_generic),

       BFD_JUMP_TABLE_LINK (_bfd_nolink),

       BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

    NULL,

    (PTR) 0                      /* backend_data */

};

#endif /* PTRACE_CORE */