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/* Native-dependent code for MIPS systems running NetBSD.
 
   Copyright (C) 2000, 2001, 2002, 2004, 2007, 2008
   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 (int regno)
{
  return ((regno) >= MIPS_ZERO_REGNUM
	  && (regno) <= gdbarch_pc_regnum (current_gdbarch));
}
 
static void
mipsnbsd_fetch_inferior_registers (struct regcache *regcache, int regno)
{
  if (regno == -1 || getregs_supplies (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 regcache *regcache, int regno)
{
  if (regno == -1 || getregs_supplies (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);
}