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/* Native-dependent code for HP PA-RISC BSD's.

   Copyright (C) 2004, 2005, 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 "hppa-tdep.h"

#include "inf-ptrace.h"

static int

hppabsd_gregset_supplies_p (int regnum)

{

  return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_PCOQ_TAIL_REGNUM);

}

static int

hppabsd_fpregset_supplies_p (int regnum)

{

  return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);

}

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

static void

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

{

  const char *regs = gregs;

  int regnum;

  for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)

    regcache_raw_supply (regcache, regnum, regs + regnum * 4);

  regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs);

  regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);

  regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);

}

/* Supply the floating-point registers stored in FPREGS to REGCACHE.  */

static void

hppabsd_supply_fpregset (struct regcache *regcache, const void *fpregs)

{

  const char *regs = fpregs;

  int regnum;

  for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;

       regnum += 2, regs += 8)

    {

      regcache_raw_supply (regcache, regnum, regs);

      regcache_raw_supply (regcache, regnum + 1, regs + 4);

    }

}

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

   in GREGS.  */

static void

hppabsd_collect_gregset (const struct regcache *regcache,

                          void *gregs, int regnum)

{

  char *regs = gregs;

  int i;

  for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)

    {

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

        regcache_raw_collect (regcache, i, regs + i * 4);

    }

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

    regcache_raw_collect (regcache, HPPA_SAR_REGNUM, regs);

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

    regcache_raw_collect (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);

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

    regcache_raw_collect (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);

}

/* Collect the floating-point registers from REGCACHE and store them

   in FPREGS.  */

static void

hppabsd_collect_fpregset (struct regcache *regcache,

                          void *fpregs, int regnum)

{

  char *regs = fpregs;

  int i;

  for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)

    {

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

        {

          regcache_raw_collect (regcache, i, regs);

          regcache_raw_collect (regcache, i + 1, regs + 4);

        }

    }

}

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

   for all registers (including the floating-point registers).  */

static void

hppabsd_fetch_registers (struct regcache *regcache, int regnum)

{

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

    {

      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

      hppabsd_supply_gregset (regcache, &regs);

    }

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

    {

      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"));

      hppabsd_supply_fpregset (regcache, &fpregs);

    }

}

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

   this for all registers (including the floating-point registers).  */

static void

hppabsd_store_registers (struct regcache *regcache, int regnum)

{

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

    {

      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),

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

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

      hppabsd_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"));

    }

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

    {

      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"));

      hppabsd_collect_fpregset (regcache, &fpregs, regnum);

      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_hppabsd_nat (void);

void

_initialize_hppabsd_nat (void)

{

  struct target_ops *t;

  /* Add in local overrides.  */

  t = inf_ptrace_target ();

  t->to_fetch_registers = hppabsd_fetch_registers;

  t->to_store_registers = hppabsd_store_registers;

  add_target (t);

}