bfd/ptrace-core.c

/* BFD backend for core files which use the ptrace_user structure
   Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2001
   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;

  val = bfd_read ((void *)&u, 1, 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.  */
  rawptr = (struct trad_core_struct *)
		bfd_zalloc (abfd, sizeof (struct trad_core_struct));

  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.  This is raunchy, but bfd_close wants to free
     them separately.  */

  core_stacksec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  if (core_stacksec (abfd) == NULL)
    return NULL;
  core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  if (core_datasec (abfd) == NULL)
    return NULL;
  core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  if (core_regsec (abfd) == NULL)
    return NULL;

  core_stacksec (abfd)->name = ".stack";
  core_datasec (abfd)->name = ".data";
  core_regsec (abfd)->name = ".reg";

  /* 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;

  abfd->sections = core_stacksec (abfd);
  core_stacksec (abfd)->next = core_datasec (abfd);
  core_datasec (abfd)->next = core_regsec (abfd);
  abfd->section_count = 3;

  return abfd->xvec;
}

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 */