src/arch/mips/isa/base.isa

   1 // -*- mode:c++ -*-
   2
   3 // Copyright (c) 2007 MIPS Technologies, Inc.
   4 // All rights reserved.
   5 //
   6 // Redistribution and use in source and binary forms, with or without
   7 // modification, are permitted provided that the following conditions are
   8 // met: redistributions of source code must retain the above copyright
   9 // notice, this list of conditions and the following disclaimer;
  10 // redistributions in binary form must reproduce the above copyright
  11 // notice, this list of conditions and the following disclaimer in the
  12 // documentation and/or other materials provided with the distribution;
  13 // neither the name of the copyright holders nor the names of its
  14 // contributors may be used to endorse or promote products derived from
  15 // this software without specific prior written permission.
  16 //
  17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 //
  29 // Authors: Korey Sewell
  30
  31 ////////////////////////////////////////////////////////////////////
  32 //
  33 // Base class for MIPS instructions, and some support functions
  34 //
  35
  36 //Outputs to decoder.hh
  37 output header {{
  38
  39     using namespace MipsISA;
  40
  41     /**
  42      * Base class for all MIPS static instructions.
  43      */
  44     class MipsStaticInst : public StaticInst
  45     {
  46       protected:
  47
  48         // Constructor
  49         MipsStaticInst(const char *mnem, MachInst _machInst, OpClass __opClass)
  50             : StaticInst(mnem, _machInst, __opClass)
  51         {
  52         }
  53
  54         /// Print a register name for disassembly given the unique
  55         /// dependence tag number (FP or int).
  56         void printReg(std::ostream &os, RegId reg) const;
  57
  58         std::string generateDisassembly(
  59                 Addr pc, const SymbolTable *symtab) const override;
  60
  61       public:
  62         void
  63         advancePC(MipsISA::PCState &pc) const override
  64         {
  65             pc.advance();
  66         }
  67
  68         size_t
  69         asBytes(void *buf, size_t max_size) override
  70         {
  71             return simpleAsBytes(buf, max_size, machInst);
  72         }
  73     };
  74
  75 }};
  76
  77 //Ouputs to decoder.cc
  78 output decoder {{
  79
  80     void MipsStaticInst::printReg(std::ostream &os, RegId reg) const
  81     {
  82         if (reg.isIntReg()) {
  83             ccprintf(os, "r%d", reg.index());
  84         }
  85         else {
  86             ccprintf(os, "f%d", reg.index());
  87         }
  88     }
  89
  90     std::string MipsStaticInst::generateDisassembly(Addr pc, const SymbolTable *symtab) const
  91     {
  92         std::stringstream ss;
  93
  94         ccprintf(ss, "%-10s ", mnemonic);
  95
  96         // Need to find standard way to not print
  97         // this info. Maybe add bool variable to
  98         // class?
  99         if (strcmp(mnemonic, "syscall") != 0) {
 100             if(_numDestRegs > 0){
 101                 printReg(ss, _destRegIdx[0]);
 102             }
 103
 104             if(_numSrcRegs > 0) {
 105                 ss << ", ";
 106                 printReg(ss, _srcRegIdx[0]);
 107             }
 108
 109             if(_numSrcRegs > 1) {
 110                 ss << ", ";
 111                 printReg(ss, _srcRegIdx[1]);
 112             }
 113         }
 114
 115         // Should we define a separate inst. class
 116         // just for two insts?
 117         if (strcmp(mnemonic, "sll") == 0 || strcmp(mnemonic, "sra") == 0) {
 118             ccprintf(ss,", %d",SA);
 119         }
 120
 121         return ss.str();
 122     }
 123
 124 }};
 125