sim/common/sim-bits.c

/* The common simulator framework for GDB, the GNU Debugger.

   Copyright 2002 Free Software Foundation, Inc.

   Contributed by Andrew Cagney and Red Hat.

   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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */


#ifndef _SIM_BITS_C_
#define _SIM_BITS_C_

#include "sim-basics.h"
#include "sim-assert.h"
#include "sim-io.h"


INLINE_SIM_BITS\
(unsigned_word)
LSMASKED (unsigned_word val,
	  int start,
	  int stop)
{
  /* NOTE - start, stop can wrap */
  val &= LSMASK (start, stop);
  return val;
}


INLINE_SIM_BITS\
(unsigned_word)
MSMASKED (unsigned_word val,
	  int start,
	  int stop)
{
  /* NOTE - start, stop can wrap */
  val &= MSMASK (start, stop);
  return val;
}


INLINE_SIM_BITS\
(unsigned_word)
LSEXTRACTED (unsigned_word val,
	     int start,
	     int stop)
{
  ASSERT (start >= stop);
#if (WITH_TARGET_WORD_BITSIZE == 64)
  return LSEXTRACTED64 (val, start, stop);
#endif
#if (WITH_TARGET_WORD_BITSIZE == 32)
  if (stop >= 32)
    return 0;
  else
    {
      if (start < 32)
	val &= LSMASK (start, 0);
      val >>= stop;
      return val;
    }
#endif
#if (WITH_TARGET_WORD_BITSIZE == 16)
  if (stop >= 16)
    return 0;
  else
    {
      if (start < 16)
	val &= LSMASK (start, 0);
      val >>= stop;
      return val;
    }
#endif
}


INLINE_SIM_BITS\
(unsigned_word)
MSEXTRACTED (unsigned_word val,
	     int start,
	     int stop)
{
  ASSERT (start <= stop);
#if (WITH_TARGET_WORD_BITSIZE == 64)
  return MSEXTRACTED64 (val, start, stop);
#endif
#if (WITH_TARGET_WORD_BITSIZE == 32)
  if (stop < 32)
    return 0;
  else
    {
      if (start >= 32)
	val &= MSMASK (start, 64 - 1);
      val >>= (64 - stop - 1);
      return val;
    }
#endif
#if (WITH_TARGET_WORD_BITSIZE == 16)
  if (stop < 16)
    return 0;
  else
    {
      if (start >= 16)
	val &= MSMASK (start, 64 - 1);
      val >>= (64 - stop - 1);
      return val;
    }
#endif
}


INLINE_SIM_BITS\
(unsigned_word)
LSINSERTED (unsigned_word val,
	    int start,
	    int stop)
{
  ASSERT (start >= stop);
#if (WITH_TARGET_WORD_BITSIZE == 64)
  return LSINSERTED64 (val, start, stop);
#endif
#if (WITH_TARGET_WORD_BITSIZE == 32)
  /* Bit numbers are 63..0, even for 32 bit targets.
     On 32 bit targets we ignore 63..32  */
  if (stop >= 32)
    return 0;
  else
    {
      val <<= stop;
      val &= LSMASK (start, stop);
      return val;
    }
#endif
#if (WITH_TARGET_WORD_BITSIZE == 16)
  /* Bit numbers are 63..0, even for 16 bit targets.
     On 16 bit targets we ignore 63..16  */
  if (stop >= 16)
    return 0;
  else
    {
      val <<= stop;
      val &= LSMASK (start, stop);
      return val;
    }
#endif
}

INLINE_SIM_BITS\
(unsigned_word)
MSINSERTED (unsigned_word val,
	    int start,
	    int stop)
{
  ASSERT (start <= stop);
#if (WITH_TARGET_WORD_BITSIZE == 64)
  return MSINSERTED64 (val, start, stop);
#endif
#if (WITH_TARGET_WORD_BITSIZE == 32)
  /* Bit numbers are 0..63, even for 32 bit targets.
     On 32 bit targets we ignore 0..31.  */
  if (stop < 32)
    return 0;
  else
    {
      val <<= ((64 - 1) - stop);
      val &= MSMASK (start, stop);
      return val;
    }
#endif
#if (WITH_TARGET_WORD_BITSIZE == 16)
  /* Bit numbers are 0..63, even for 16 bit targets.
     On 16 bit targets we ignore 0..47.  */
  if (stop < 32 + 16)
    return 0;
  else
    {
      val <<= ((64 - 1) - stop);
      val &= MSMASK (start, stop);
      return val;
    }
#endif
}



INLINE_SIM_BITS\
(unsigned_word)
LSSEXT (signed_word val,
	int sign_bit)
{
  ASSERT (sign_bit < 64);
#if (WITH_TARGET_WORD_BITSIZE == 64)
  return LSSEXT64 (val, sign_bit);
#endif
#if (WITH_TARGET_WORD_BITSIZE == 32)
  if (sign_bit >= 32)
    return val;
  else {
    val = LSSEXT32 (val, sign_bit);
    return val;
  }
#endif
#if (WITH_TARGET_WORD_BITSIZE == 16)
  if (sign_bit >= 16)
    return val;
  else {
    val = LSSEXT16 (val, sign_bit);
    return val;
  }
#endif
}

INLINE_SIM_BITS\
(unsigned_word)
MSSEXT (signed_word val,
	int sign_bit)
{
  ASSERT (sign_bit < 64);
#if (WITH_TARGET_WORD_BITSIZE == 64)
  return MSSEXT64 (val, sign_bit);
#endif
#if (WITH_TARGET_WORD_BITSIZE == 32)
  if (sign_bit < 32)
    return val;
  else {
    val = MSSEXT32 (val, sign_bit - 32);
    return val;
  }
#endif
#if (WITH_TARGET_WORD_BITSIZE == 16)
  if (sign_bit < 32 + 16)
    return val;
  else {
    val = MSSEXT16 (val, sign_bit - 32 - 16);
    return val;
  }
#endif
}



#define N 8
#include "sim-n-bits.h"
#undef N

#define N 16
#include "sim-n-bits.h"
#undef N

#define N 32
#include "sim-n-bits.h"
#undef N

#define N 64
#include "sim-n-bits.h"
#undef N

#endif /* _SIM_BITS_C_ */