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/* Native-dependent code for MIPS systems running NetBSD.

   Copyright (C) 2000, 2001, 2002, 2004, 2007, 2008, 2009, 2010

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "inferior.h"

#include "regcache.h"

#include "target.h"

#include <sys/types.h>

#include <sys/ptrace.h>

#include <machine/reg.h>

#include "mips-tdep.h"

#include "mipsnbsd-tdep.h"

#include "inf-ptrace.h"

/* Determine if PT_GETREGS fetches this register.  */

static int

getregs_supplies (struct gdbarch *gdbarch, int regno)

{

  return ((regno) >= MIPS_ZERO_REGNUM

          && (regno) <= gdbarch_pc_regnum (gdbarch));

}

static void

mipsnbsd_fetch_inferior_registers (struct target_ops *ops,

                                   struct regcache *regcache, int regno)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regno == -1 || getregs_supplies (gdbarch, regno))

    {

      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &regs, 0) == -1)

        perror_with_name (_("Couldn't get registers"));

      mipsnbsd_supply_reg (regcache, (char *) &regs, regno);

      if (regno != -1)

        return;

    }

  if (regno == -1 || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)

        perror_with_name (_("Couldn't get floating point status"));

      mipsnbsd_supply_fpreg (regcache, (char *) &fpregs, regno);

    }

}

static void

mipsnbsd_store_inferior_registers (struct target_ops *ops,

                                   struct regcache *regcache, int regno)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regno == -1 || getregs_supplies (gdbarch, regno))

    {

      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &regs, 0) == -1)

        perror_with_name (_("Couldn't get registers"));

      mipsnbsd_fill_reg (regcache, (char *) &regs, regno);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &regs, 0) == -1)

        perror_with_name (_("Couldn't write registers"));

      if (regno != -1)

        return;

    }

  if (regno == -1 || regno >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))

    {

      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)

        perror_with_name (_("Couldn't get floating point status"));

      mipsnbsd_fill_fpreg (regcache, (char *) &fpregs, regno);

      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),

                  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)

        perror_with_name (_("Couldn't write floating point status"));

    }

}

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

void _initialize_mipsnbsd_nat (void);

void

_initialize_mipsnbsd_nat (void)

{

  struct target_ops *t;

  t = inf_ptrace_target ();

  t->to_fetch_registers = mipsnbsd_fetch_inferior_registers;

  t->to_store_registers = mipsnbsd_store_inferior_registers;

  add_target (t);

}