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/* Target-dependent code for OpenBSD/i386.

   Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 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 "arch-utils.h"

#include "gdbcore.h"

#include "regcache.h"

#include "i386-tdep.h"

#include "i387-tdep.h"

/* Provide a prototype to silence -Wmissing-prototypes.  */

void _initialize_i386obsd_tdep (void);

#define SIZEOF_STRUCT_REG       (16 * 4)

static void

i386obsd_supply_reg (char *regs, int regno)

{

  int i;

  for (i = 0; i <= 15; i++)

    if (regno == i || regno == -1)

      supply_register (i, regs + i * 4);

}

static void

fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,

                      CORE_ADDR ignore)

{

  char *regs, *fsave;

  /* We get everything from one section.  */

  if (which != 0)

    return;

  if (core_reg_size < (SIZEOF_STRUCT_REG + 108))

    {

      warning ("Wrong size register set in core file.");

      return;

    }

  regs = core_reg_sect;

  fsave = core_reg_sect + SIZEOF_STRUCT_REG;

  /* Integer registers.  */

  i386obsd_supply_reg (regs, -1);

  /* Floating point registers.  */

  i387_supply_fsave (fsave);

}

static struct core_fns i386obsd_core_fns =

{

  bfd_target_unknown_flavour,           /* core_flavour */

  default_check_format,                 /* check_format */

  default_core_sniffer,                 /* core_sniffer */

  fetch_core_registers,                 /* core_read_registers */

  NULL                                  /* next */

};

CORE_ADDR i386obsd_sigtramp_start = 0xbfbfdf20;

CORE_ADDR i386obsd_sigtramp_end = 0xbfbfdff0;

/* From <machine/signal.h>.  */

int i386obsd_sc_pc_offset = 44;

int i386obsd_sc_sp_offset = 56;

static void

i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* Obviously OpenBSD is BSD-based.  */

  i386bsd_init_abi (info, gdbarch);

  /* OpenBSD uses -freg-struct-return by default.  */

  tdep->struct_return = reg_struct_return;

  /* OpenBSD uses a different memory layout.  */

  tdep->sigtramp_start = i386obsd_sigtramp_start;

  tdep->sigtramp_end = i386obsd_sigtramp_end;

  /* OpenBSD has a `struct sigcontext' that's different from the

     origional 4.3 BSD.  */

  tdep->sc_pc_offset = i386obsd_sc_pc_offset;

  tdep->sc_sp_offset = i386obsd_sc_sp_offset;

}

void

_initialize_i386obsd_tdep (void)

{

  add_core_fns (&i386obsd_core_fns);

  /* FIXME: kettenis/20021020: Since OpenBSD/i386 binaries are

     indistingushable from NetBSD/i386 a.out binaries, building a GDB

     that should support both these targets will probably not work as

     expected.  */

#define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT

  gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_OPENBSD_AOUT,

                          i386obsd_init_abi);

}