src/arch/sparc/intregfile.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/intregfile.hh"
  33 #include "base/trace.hh"
  34 #include "sim/serialize.hh"
  35
  36 #include <string.h>
  37
  38 using namespace SparcISA;
  39 using namespace std;
  40
  41 class Checkpoint;
  42
  43 string SparcISA::getIntRegName(RegIndex index)
  44 {
  45     static std::string intRegName[NumIntArchRegs] =
  46         {"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
  47          "o0", "o1", "o2", "o3", "o4", "o5", "o6", "o7",
  48          "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
  49          "i0", "i1", "i2", "i3", "i4", "i5", "i6", "i7"};
  50     return intRegName[index];
  51 }
  52
  53 int IntRegFile::flattenIndex(int reg)
  54 {
  55     int flatIndex = offset[reg >> FrameOffsetBits]
  56         | (reg & FrameOffsetMask);
  57     DPRINTF(Sparc, "Flattened index %d into %d.\n", reg, flatIndex);
  58     return flatIndex;
  59 }
  60
  61 void IntRegFile::clear()
  62 {
  63     int x;
  64     for (x = 0; x < MaxGL; x++)
  65         memset(regGlobals[x], 0, sizeof(IntReg) * RegsPerFrame);
  66     for(int x = 0; x < 2 * NWindows; x++)
  67         memset(regSegments[x], 0, sizeof(IntReg) * RegsPerFrame);
  68 }
  69
  70 IntRegFile::IntRegFile()
  71 {
  72     offset[Globals] = 0;
  73     regView[Globals] = regGlobals[0];
  74     setCWP(0);
  75     clear();
  76 }
  77
  78 IntReg IntRegFile::readReg(int intReg)
  79 {
  80     IntReg val;
  81     if(intReg < NumIntArchRegs)
  82         val = regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask];
  83     else if((intReg -= NumIntArchRegs) < NumMicroIntRegs)
  84         val = microRegs[intReg];
  85     else
  86         panic("Tried to read non-existant integer register %d, %d\n", NumIntArchRegs + NumMicroIntRegs + intReg, intReg);
  87
  88     DPRINTF(Sparc, "Read register %d = 0x%x\n", intReg, val);
  89     return val;
  90 }
  91
  92 void IntRegFile::setReg(int intReg, const IntReg &val)
  93 {
  94     if(intReg)
  95     {
  96         DPRINTF(Sparc, "Wrote register %d = 0x%x\n", intReg, val);
  97         if(intReg < NumIntArchRegs)
  98             regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask] = val;
  99         else if((intReg -= NumIntArchRegs) < NumMicroIntRegs)
 100             microRegs[intReg] = val;
 101         else
 102             panic("Tried to set non-existant integer register\n");
 103     }
 104 }
 105
 106 //This doesn't effect the actual CWP register.
 107 //It's purpose is to adjust the view of the register file
 108 //to what it would be if CWP = cwp.
 109 void IntRegFile::setCWP(int cwp)
 110 {
 111     int index = ((NWindows - cwp) % NWindows) * 2;
 112     offset[Outputs] = FrameOffset + (index * RegsPerFrame);
 113     offset[Locals] = FrameOffset + ((index+1) * RegsPerFrame);
 114     offset[Inputs] = FrameOffset +
 115         (((index+2) % (NWindows * 2)) * RegsPerFrame);
 116     regView[Outputs] = regSegments[index];
 117     regView[Locals] = regSegments[index+1];
 118     regView[Inputs] = regSegments[(index+2) % (NWindows * 2)];
 119
 120     DPRINTF(Sparc, "Changed the CWP value to %d\n", cwp);
 121 }
 122
 123 void IntRegFile::setGlobals(int gl)
 124 {
 125     DPRINTF(Sparc, "Now using %d globals\n", gl);
 126
 127     regView[Globals] = regGlobals[gl];
 128     offset[Globals] = RegGlobalOffset + gl * RegsPerFrame;
 129 }
 130
 131 void IntRegFile::serialize(std::ostream &os)
 132 {
 133     unsigned int x;
 134     for(x = 0; x < MaxGL; x++)
 135         SERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
 136     for(x = 0; x < 2 * NWindows; x++)
 137         SERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
 138     SERIALIZE_ARRAY(microRegs, NumMicroIntRegs);
 139 }
 140
 141 void IntRegFile::unserialize(Checkpoint *cp, const std::string &section)
 142 {
 143     unsigned int x;
 144     for(x = 0; x < MaxGL; x++)
 145         UNSERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
 146     for(unsigned int x = 0; x < 2 * NWindows; x++)
 147         UNSERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
 148     UNSERIALIZE_ARRAY(microRegs, NumMicroIntRegs);
 149 }