/* 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);
}