src/arch/sparc/floatregfile.cc

   1 /*
   2  * Copyright (c) 2003-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Gabe Black
  29  *          Ali Saidi
  30  */
  31
  32 #include "arch/sparc/floatregfile.hh"
  33 #include "base/trace.hh"
  34 #include "sim/byteswap.hh"
  35 #include "sim/serialize.hh"
  36
  37 #include <string.h>
  38
  39 using namespace SparcISA;
  40 using namespace std;
  41
  42 class Checkpoint;
  43
  44 string SparcISA::getFloatRegName(RegIndex index)
  45 {
  46     static std::string floatRegName[NumFloatRegs] =
  47         {"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
  48          "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
  49          "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
  50          "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
  51          "f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
  52          "f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47",
  53          "f48", "f49", "f50", "f51", "f52", "f53", "f54", "f55",
  54          "f56", "f57", "f58", "f59", "f60", "f61", "f62", "f63"};
  55     return floatRegName[index];
  56 }
  57
  58 void FloatRegFile::clear()
  59 {
  60     memset(regSpace, 0, sizeof(regSpace));
  61 }
  62
  63 FloatReg FloatRegFile::readReg(int floatReg, int width)
  64 {
  65     //In each of these cases, we have to copy the value into a temporary
  66     //variable. This is because we may otherwise try to access an
  67     //unaligned portion of memory.
  68     FloatReg result;
  69     switch(width)
  70     {
  71       case SingleWidth:
  72         float32_t result32;
  73         memcpy(&result32, regSpace + 4 * floatReg, sizeof(result32));
  74         result = htog(result32);
  75         break;
  76       case DoubleWidth:
  77         float64_t result64;
  78         memcpy(&result64, regSpace + 4 * floatReg, sizeof(result64));
  79         result = htog(result64);
  80         break;
  81       case QuadWidth:
  82         float128_t result128;
  83         memcpy(&result128, regSpace + 4 * floatReg, sizeof(result128));
  84         result = htog(result128);
  85         break;
  86       default:
  87         panic("Attempted to read a %d bit floating point register!", width);
  88     }
  89     return result;
  90 }
  91
  92 FloatRegBits FloatRegFile::readRegBits(int floatReg, int width)
  93 {
  94     //In each of these cases, we have to copy the value into a temporary
  95     //variable. This is because we may otherwise try to access an
  96     //unaligned portion of memory.
  97     FloatRegBits result;
  98     switch(width)
  99     {
 100       case SingleWidth:
 101         uint32_t result32;
 102         memcpy(&result32, regSpace + 4 * floatReg, sizeof(result32));
 103         result = htog(result32);
 104         break;
 105       case DoubleWidth:
 106         uint64_t result64;
 107         memcpy(&result64, regSpace + 4 * floatReg, sizeof(result64));
 108         result = htog(result64);
 109         break;
 110       case QuadWidth:
 111         uint64_t result128;
 112         memcpy(&result128, regSpace + 4 * floatReg, sizeof(result128));
 113         result = htog(result128);
 114         break;
 115       default:
 116         panic("Attempted to read a %d bit floating point register!", width);
 117     }
 118     return result;
 119 }
 120
 121 Fault FloatRegFile::setReg(int floatReg, const FloatReg &val, int width)
 122 {
 123     //In each of these cases, we have to copy the value into a temporary
 124     //variable. This is because we may otherwise try to access an
 125     //unaligned portion of memory.
 126
 127     uint32_t result32;
 128     uint64_t result64;
 129     switch(width)
 130     {
 131       case SingleWidth:
 132         result32 = gtoh((uint32_t)val);
 133         memcpy(regSpace + 4 * floatReg, &result32, sizeof(result32));
 134         break;
 135       case DoubleWidth:
 136         result64 = gtoh((uint64_t)val);
 137         memcpy(regSpace + 4 * floatReg, &result64, sizeof(result64));
 138         break;
 139       case QuadWidth:
 140         panic("Quad width FP not implemented.");
 141         break;
 142       default:
 143         panic("Attempted to read a %d bit floating point register!", width);
 144     }
 145     return NoFault;
 146 }
 147
 148 Fault FloatRegFile::setRegBits(int floatReg, const FloatRegBits &val, int width)
 149 {
 150     //In each of these cases, we have to copy the value into a temporary
 151     //variable. This is because we may otherwise try to access an
 152     //unaligned portion of memory.
 153     uint32_t result32;
 154     uint64_t result64;
 155     switch(width)
 156     {
 157       case SingleWidth:
 158         result32 = gtoh((uint32_t)val);
 159         memcpy(regSpace + 4 * floatReg, &result32, sizeof(result32));
 160         break;
 161       case DoubleWidth:
 162         result64 = gtoh((uint64_t)val);
 163         memcpy(regSpace + 4 * floatReg, &result64, sizeof(result64));
 164         break;
 165       case QuadWidth:
 166         panic("Quad width FP not implemented.");
 167         break;
 168       default:
 169         panic("Attempted to read a %d bit floating point register!", width);
 170     }
 171     return NoFault;
 172 }
 173
 174 void FloatRegFile::serialize(std::ostream &os)
 175 {
 176     SERIALIZE_ARRAY((unsigned char *)regSpace,
 177             SingleWidth / 8 * NumFloatRegs);
 178 }
 179
 180 void FloatRegFile::unserialize(Checkpoint *cp, const std::string &section)
 181 {
 182     UNSERIALIZE_ARRAY((unsigned char *)regSpace,
 183             SingleWidth / 8 * NumFloatRegs);
 184 }
 185