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/* Native-dependent code for OpenBSD/mips64.

   Copyright (C) 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 "inf-ptrace.h"

/* Shorthand for some register numbers used below.  */

#define MIPS_PC_REGNUM  MIPS_EMBED_PC_REGNUM

#define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM

#define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32

/* Supply the general-purpose registers stored in GREGS to REGCACHE.  */

static void

mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)

{

  const char *regs = gregs;

  int regnum;

  for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)

    regcache_raw_supply (regcache, regnum, regs + regnum * 8);

  for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)

    regcache_raw_supply (regcache, regnum, regs + (regnum + 2) * 8);

}

/* Collect the general-purpose registers from REGCACHE and store them

   in GREGS.  */

static void

mips64obsd_collect_gregset (const struct regcache *regcache,

                            void *gregs, int regnum)

{

  char *regs = gregs;

  int i;

  for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)

    {

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

        regcache_raw_collect (regcache, i, regs + i * 8);

    }

  for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)

    {

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

        regcache_raw_collect (regcache, i, regs + (i + 2) * 8);

    }

}

/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this

   for all registers.  */

static void

mips64obsd_fetch_inferior_registers (struct regcache *regcache, int regnum)

{

  struct reg regs;

  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

  mips64obsd_supply_gregset (regcache, &regs);

}

/* Store register REGNUM back into the inferior.  If REGNUM is -1, do

   this for all registers.  */

static void

mips64obsd_store_inferior_registers (struct regcache *regcache, int regnum)

{

  struct reg regs;

  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

  mips64obsd_collect_gregset (regcache, &regs, regnum);

  if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),

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

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

}

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

void _initialize_mips64obsd_nat (void);

void

_initialize_mips64obsd_nat (void)

{

  struct target_ops *t;

  t = inf_ptrace_target ();

  t->to_fetch_registers = mips64obsd_fetch_inferior_registers;

  t->to_store_registers = mips64obsd_store_inferior_registers;

  add_target (t);

}