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 using namespace SparcISA;
  38 using namespace std;
  39
  40 class Checkpoint;
  41
  42 string SparcISA::getFloatRegName(RegIndex index)
  43 {
  44     static std::string floatRegName[NumFloatRegs] =
  45         {"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
  46          "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
  47          "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
  48          "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
  49          "f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
  50          "f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47",
  51          "f48", "f49", "f50", "f51", "f52", "f53", "f54", "f55",
  52          "f56", "f57", "f58", "f59", "f60", "f61", "f62", "f63"};
  53     return floatRegName[index];
  54 }
  55
  56 void FloatRegFile::clear()
  57 {
  58     bzero(regSpace, sizeof(regSpace));
  59 }
  60
  61 FloatReg FloatRegFile::readReg(int floatReg, int width)
  62 {
  63     //In each of these cases, we have to copy the value into a temporary
  64     //variable. This is because we may otherwise try to access an
  65     //unaligned portion of memory.
  66     switch(width)
  67     {
  68       case SingleWidth:
  69         float32_t result32;
  70         memcpy(&result32, regSpace + 4 * floatReg, sizeof(result32));
  71         return htog(result32);
  72       case DoubleWidth:
  73         float64_t result64;
  74         memcpy(&result64, regSpace + 4 * floatReg, sizeof(result64));
  75         return htog(result64);
  76       case QuadWidth:
  77         float128_t result128;
  78         memcpy(&result128, regSpace + 4 * floatReg, sizeof(result128));
  79         return htog(result128);
  80       default:
  81         panic("Attempted to read a %d bit floating point register!", width);
  82     }
  83 }
  84
  85 FloatRegBits FloatRegFile::readRegBits(int floatReg, int width)
  86 {
  87     //In each of these cases, we have to copy the value into a temporary
  88     //variable. This is because we may otherwise try to access an
  89     //unaligned portion of memory.
  90     switch(width)
  91     {
  92       case SingleWidth:
  93         uint32_t result32;
  94         memcpy(&result32, regSpace + 4 * floatReg, sizeof(result32));
  95         return htog(result32);
  96       case DoubleWidth:
  97         uint64_t result64;
  98         memcpy(&result64, regSpace + 4 * floatReg, sizeof(result64));
  99         return htog(result64);
 100       case QuadWidth:
 101         uint64_t result128;
 102         memcpy(&result128, regSpace + 4 * floatReg, sizeof(result128));
 103         return htog(result128);
 104       default:
 105         panic("Attempted to read a %d bit floating point register!", width);
 106     }
 107 }
 108
 109 Fault FloatRegFile::setReg(int floatReg, const FloatReg &val, int width)
 110 {
 111     //In each of these cases, we have to copy the value into a temporary
 112     //variable. This is because we may otherwise try to access an
 113     //unaligned portion of memory.
 114
 115     uint32_t result32;
 116     uint64_t result64;
 117     DPRINTF(Sparc, "Setting floating point register %d\n", floatReg);
 118     switch(width)
 119     {
 120       case SingleWidth:
 121         result32 = gtoh((uint32_t)val);
 122         memcpy(regSpace + 4 * floatReg, &result32, sizeof(result32));
 123         break;
 124       case DoubleWidth:
 125         result64 = gtoh((uint64_t)val);
 126         memcpy(regSpace + 4 * floatReg, &result64, sizeof(result64));
 127         break;
 128       case QuadWidth:
 129         panic("Quad width FP not implemented.");
 130         break;
 131       default:
 132         panic("Attempted to read a %d bit floating point register!", width);
 133     }
 134     return NoFault;
 135 }
 136
 137 Fault FloatRegFile::setRegBits(int floatReg, const FloatRegBits &val, int width)
 138 {
 139     //In each of these cases, we have to copy the value into a temporary
 140     //variable. This is because we may otherwise try to access an
 141     //unaligned portion of memory.
 142     uint32_t result32;
 143     uint64_t result64;
 144     switch(width)
 145     {
 146       case SingleWidth:
 147         result32 = gtoh((uint32_t)val);
 148         memcpy(regSpace + 4 * floatReg, &result32, sizeof(result32));
 149         break;
 150       case DoubleWidth:
 151         result64 = gtoh((uint64_t)val);
 152         memcpy(regSpace + 4 * floatReg, &result64, sizeof(result64));
 153         break;
 154       case QuadWidth:
 155         panic("Quad width FP not implemented.");
 156         break;
 157       default:
 158         panic("Attempted to read a %d bit floating point register!", width);
 159     }
 160     return NoFault;
 161 }
 162
 163 void FloatRegFile::serialize(std::ostream &os)
 164 {
 165     SERIALIZE_ARRAY((unsigned char *)regSpace,
 166             SingleWidth / 8 * NumFloatRegs);
 167 }
 168
 169 void FloatRegFile::unserialize(Checkpoint *cp, const std::string &section)
 170 {
 171     UNSERIALIZE_ARRAY((unsigned char *)regSpace,
 172             SingleWidth / 8 * NumFloatRegs);
 173 }
 174