sim/common/sim-endian.c

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

   Copyright 2002-2025 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_ENDIAN_C_
#define _SIM_ENDIAN_C_

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

#include "bfd.h"

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


#if !defined(_SWAP_1)
#define _SWAP_1(SET,RAW) SET (RAW)
#endif

#if !defined(_SWAP_2) && (HOST_BYTE_ORDER == BFD_ENDIAN_LITTLE) && defined(htons)
#define _SWAP_2(SET,RAW) SET htons (RAW)
#endif

#ifndef	_SWAP_2
#define _SWAP_2(SET,RAW) SET (((RAW) >> 8) | ((RAW) << 8))
#endif

#if !defined(_SWAP_4) && (HOST_BYTE_ORDER == BFD_ENDIAN_LITTLE) && defined(htonl)
#define _SWAP_4(SET,RAW) SET htonl (RAW)
#endif

#ifndef _SWAP_4
#define	_SWAP_4(SET,RAW) SET (((RAW) << 24) | (((RAW) & 0xff00) << 8) | (((RAW) & 0xff0000) >> 8) | ((RAW) >> 24))
#endif

#ifndef _SWAP_8
#define _SWAP_8(SET,RAW) \
  union { unsigned_8 dword; unsigned_4 words[2]; } in, out; \
  in.dword = RAW; \
  _SWAP_4 (out.words[0] =, in.words[1]); \
  _SWAP_4 (out.words[1] =, in.words[0]); \
  SET out.dword;
#endif

#ifndef _SWAP_16
#define _SWAP_16(SET,RAW) \
  union { unsigned_16 word; unsigned_4 words[4]; } in, out; \
  in.word = (RAW); \
  _SWAP_4 (out.words[0] =, in.words[3]); \
  _SWAP_4 (out.words[1] =, in.words[2]); \
  _SWAP_4 (out.words[2] =, in.words[1]); \
  _SWAP_4 (out.words[3] =, in.words[0]); \
  SET out.word;
#endif


#define N 1
#include "sim-n-endian.h"
#undef N

#define N 2
#include "sim-n-endian.h"
#undef N

#define N 4
#include "sim-n-endian.h"
#undef N

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

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


INLINE_SIM_ENDIAN\
(unsigned_8)
sim_endian_split_16 (unsigned_16 word, int w)
{
  if (HOST_BYTE_ORDER == BFD_ENDIAN_LITTLE)
    {
      return word.a[1 - w];
    }
  else
    {
      return word.a[w];
    }
}


INLINE_SIM_ENDIAN\
(unsigned_16)
sim_endian_join_16 (unsigned_8 h, unsigned_8 l)

{
  unsigned_16 word;
  if (HOST_BYTE_ORDER == BFD_ENDIAN_LITTLE)
    {
      word.a[0] = l;
      word.a[1] = h;
    }
  else
    {
      word.a[0] = h;
      word.a[1] = l;
    }
  return word;
}



#endif /* _SIM_ENDIAN_C_ */