Subversion Repositories or1k

/* Native-dependent code for OpenBSD/i386.

   Copyright 2002 Free Software Foundation, Inc.

   This file is part of GDB.

   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.  */

#include "defs.h"

#include <sys/param.h>

#include <sys/sysctl.h>

/* Prevent warning from -Wmissing-prototypes.  */

void _initialize_i386obsd_nat (void);

void

_initialize_i386obsd_nat (void)

{

  /* OpenBSD provides a vm.psstrings sysctl that we can use to locate

     the sigtramp.  That way we can still recognize a sigtramp if its

     location is changed in a new kernel.  This is especially

     important for OpenBSD, since it uses a different memory layout

     than NetBSD, yet we cannot distinguish between the two.

     Of course this is still based on the assumption that the sigtramp

     is placed directly under the location where the program arguments

     and environment can be found.  */

#ifdef VM_PSSTRINGS

  {

    struct _ps_strings _ps;

    int mib[2];

    size_t len;

    extern CORE_ADDR i386obsd_sigtramp_start;

    extern CORE_ADDR i386obsd_sigtramp_end;

    mib[0] = CTL_VM;

    mib[1] = VM_PSSTRINGS;

    len = sizeof (_ps);

    if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0)

      {

        i386obsd_sigtramp_start = (CORE_ADDR)_ps.val - 128;

        i386obsd_sigtramp_end = (CORE_ADDR)_ps.val;

      }

  }

#endif

}