/* Low level Alpha GNU/Linux interface, for GDB when running native.
   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
   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 "target.h"
#include "regcache.h"
#include "linux-nat.h"

#include "alpha-tdep.h"

#include <sys/ptrace.h>
#include <alpha/ptrace.h>

#include <sys/procfs.h>
#include "gregset.h"

/* The address of UNIQUE for ptrace.  */
#define ALPHA_UNIQUE_PTRACE_ADDR 65


/*
 * See the comment in m68k-tdep.c regarding the utility of these functions.
 */

void
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
{
  const long *regp = (const long *)gregsetp;

  /* PC is in slot 32, UNIQUE is in slot 33.  */
  alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
}

void
fill_gregset (const struct regcache *regcache,
	      gdb_gregset_t *gregsetp, int regno)
{
  long *regp = (long *)gregsetp;

  /* PC is in slot 32, UNIQUE is in slot 33.  */
  alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
}

/*
 * Now we do the same thing for floating-point registers.
 * Again, see the comments in m68k-tdep.c.
 */

void
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
{
  const long *regp = (const long *)fpregsetp;

  /* FPCR is in slot 32.  */
  alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
}

void
fill_fpregset (const struct regcache *regcache,
	       gdb_fpregset_t *fpregsetp, int regno)
{
  long *regp = (long *)fpregsetp;

  /* FPCR is in slot 32.  */
  alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
}


static CORE_ADDR
alpha_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
{
  if (regno == gdbarch_pc_regnum (gdbarch))
    return PC;
  if (regno == ALPHA_UNIQUE_REGNUM)
    return ALPHA_UNIQUE_PTRACE_ADDR;
  if (regno < gdbarch_fp0_regnum (gdbarch))
    return GPR_BASE + regno;
  else
    return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
}

void _initialialize_alpha_linux_nat (void);

void
_initialize_alpha_linux_nat (void)
{
  linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
}