sim/common/sim-bits.c

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

   Copyright 2002-2021 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 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/>.  */


#ifndef _SIM_BITS_C_
#define _SIM_BITS_C_

/* This must come before any other includes.  */
#include "defs.h"

#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_ */