sim/common/sim-n-bits.h

   1 /* The common simulator framework for GDB, the GNU Debugger.
   2
   3    Copyright 2002 Free Software Foundation, Inc.
   4
   5    Contributed by Andrew Cagney and Red Hat.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24
  25 #ifndef N
  26 #error "N must be #defined"
  27 #endif
  28
  29 #include "symcat.h"
  30
  31 #if defined(__STDC__) && defined(signed)
  32 /* If signed were defined to be say __signed (ie, some versions of Linux),
  33    then the signedN macro would not work correctly.  If we have a standard
  34    compiler, we have signed.  */
  35 #undef signed
  36 #endif
  37
  38 /* NOTE: See end of file for #undef */
  39 #define unsignedN XCONCAT2(unsigned,N)
  40 #define signedN XCONCAT2(signed,N)
  41 #define LSMASKn XCONCAT2(LSMASK,N)
  42 #define MSMASKn XCONCAT2(MSMASK,N)
  43 #define LSMASKEDn XCONCAT2(LSMASKED,N)
  44 #define MSMASKEDn XCONCAT2(MSMASKED,N)
  45 #define LSEXTRACTEDn XCONCAT2(LSEXTRACTED,N)
  46 #define MSEXTRACTEDn XCONCAT2(MSEXTRACTED,N)
  47 #define LSINSERTEDn XCONCAT2(LSINSERTED,N)
  48 #define MSINSERTEDn XCONCAT2(MSINSERTED,N)
  49 #define ROTn XCONCAT2(ROT,N)
  50 #define ROTLn XCONCAT2(ROTL,N)
  51 #define ROTRn XCONCAT2(ROTR,N)
  52 #define MSSEXTn XCONCAT2(MSSEXT,N)
  53 #define LSSEXTn XCONCAT2(LSSEXT,N)
  54
  55 /* TAGS: LSMASKED16 LSMASKED32 LSMASKED64 */
  56
  57 INLINE_SIM_BITS\
  58 (unsignedN)
  59 LSMASKEDn (unsignedN word,
  60            int start,
  61            int stop)
  62 {
  63   word &= LSMASKn (start, stop);
  64   return word;
  65 }
  66
  67 /* TAGS: MSMASKED16 MSMASKED32 MSMASKED64 */
  68
  69 INLINE_SIM_BITS\
  70 (unsignedN)
  71 MSMASKEDn (unsignedN word,
  72            int start,
  73            int stop)
  74 {
  75   word &= MSMASKn (start, stop);
  76   return word;
  77 }
  78
  79 /* TAGS: LSEXTRACTED16 LSEXTRACTED32 LSEXTRACTED64 */
  80
  81 INLINE_SIM_BITS\
  82 (unsignedN)
  83 LSEXTRACTEDn (unsignedN val,
  84               int start,
  85               int stop)
  86 {
  87   val <<= (N - 1 - start); /* drop high bits */
  88   val >>= (N - 1 - start) + (stop); /* drop low bits */
  89   return val;
  90 }
  91
  92 /* TAGS: MSEXTRACTED16 MSEXTRACTED32 MSEXTRACTED64 */
  93
  94 INLINE_SIM_BITS\
  95 (unsignedN)
  96 MSEXTRACTEDn (unsignedN val,
  97               int start,
  98               int stop)
  99 {
 100   val <<= (start); /* drop high bits */
 101   val >>= (start) + (N - 1 - stop); /* drop low bits */
 102   return val;
 103 }
 104
 105 /* TAGS: LSINSERTED16 LSINSERTED32 LSINSERTED64 */
 106
 107 INLINE_SIM_BITS\
 108 (unsignedN)
 109 LSINSERTEDn (unsignedN val,
 110              int start,
 111              int stop)
 112 {
 113   val <<= stop;
 114   val &= LSMASKn (start, stop);
 115   return val;
 116 }
 117
 118 /* TAGS: MSINSERTED16 MSINSERTED32 MSINSERTED64 */
 119
 120 INLINE_SIM_BITS\
 121 (unsignedN)
 122 MSINSERTEDn (unsignedN val,
 123              int start,
 124              int stop)
 125 {
 126   val <<= ((N - 1) - stop);
 127   val &= MSMASKn (start, stop);
 128   return val;
 129 }
 130
 131 /* TAGS: ROT16 ROT32 ROT64 */
 132
 133 INLINE_SIM_BITS\
 134 (unsignedN)
 135 ROTn (unsignedN val,
 136       int shift)
 137 {
 138   if (shift > 0)
 139     return ROTRn (val, shift);
 140   else if (shift < 0)
 141     return ROTLn (val, -shift);
 142   else
 143     return val;
 144 }
 145
 146 /* TAGS: ROTL16 ROTL32 ROTL64 */
 147
 148 INLINE_SIM_BITS\
 149 (unsignedN)
 150 ROTLn (unsignedN val,
 151        int shift)
 152 {
 153   unsignedN result;
 154   ASSERT (shift <= N);
 155   result = (((val) << (shift)) | ((val) >> ((N)-(shift))));
 156   return result;
 157 }
 158
 159 /* TAGS: ROTR16 ROTR32 ROTR64 */
 160
 161 INLINE_SIM_BITS\
 162 (unsignedN)
 163 ROTRn (unsignedN val,
 164        int shift)
 165 {
 166   unsignedN result;
 167   ASSERT (shift <= N);
 168   result = (((val) >> (shift)) | ((val) << ((N)-(shift))));
 169   return result;
 170 }
 171
 172 /* TAGS: LSSEXT16 LSSEXT32 LSSEXT64 */
 173
 174 INLINE_SIM_BITS\
 175 (unsignedN)
 176 LSSEXTn (signedN val,
 177          int sign_bit)
 178 {
 179   int shift;
 180   /* make the sign-bit most significant and then smear it back into
 181      position */
 182   ASSERT (sign_bit < N);
 183   shift = ((N - 1) - sign_bit);
 184   val <<= shift;
 185   val >>= shift;
 186   return val;
 187 }
 188
 189 /* TAGS: MSSEXT16 MSSEXT32 MSSEXT64 */
 190
 191 INLINE_SIM_BITS\
 192 (unsignedN)
 193 MSSEXTn (signedN val,
 194          int sign_bit)
 195 {
 196   /* make the sign-bit most significant and then smear it back into
 197      position */
 198   ASSERT (sign_bit < N);
 199   val <<= sign_bit;
 200   val >>= sign_bit;
 201   return val;
 202 }
 203
 204
 205 /* NOTE: See start of file for #define */
 206 #undef LSSEXTn
 207 #undef MSSEXTn
 208 #undef ROTLn
 209 #undef ROTRn
 210 #undef ROTn
 211 #undef LSINSERTEDn
 212 #undef MSINSERTEDn
 213 #undef LSEXTRACTEDn
 214 #undef MSEXTRACTEDn
 215 #undef LSMASKEDn
 216 #undef LSMASKn
 217 #undef MSMASKEDn
 218 #undef MSMASKn
 219 #undef signedN
 220 #undef unsignedN