src/arch/mips/isa/base.isa

   1 // -*- mode:c++ -*-
   2
   3 ////////////////////////////////////////////////////////////////////
   4 //
   5 // Base class for MIPS instructions, and some support functions
   6 //
   7
   8 //Outputs to decoder.hh
   9 output header {{
  10
  11     using namespace MipsISA;
  12
  13
  14     /**
  15      * Base class for all MIPS static instructions.
  16      */
  17     class MipsStaticInst : public StaticInst
  18     {
  19       protected:
  20
  21         /// Make MipsISA register dependence tags directly visible in
  22         /// this class and derived classes.  Maybe these should really
  23         /// live here and not in the MipsISA namespace.
  24         /*enum DependenceTags {
  25             FP_Base_DepTag = MipsISA::FP_Base_DepTag,
  26             Fpcr_DepTag = MipsISA::Fpcr_DepTag,
  27             Uniq_DepTag = MipsISA::Uniq_DepTag,
  28             IPR_Base_DepTag = MipsISA::IPR_Base_DepTag
  29             };*/
  30
  31         // Constructor
  32         MipsStaticInst(const char *mnem, MachInst _machInst, OpClass __opClass)
  33             : StaticInst(mnem, _machInst, __opClass)
  34         {
  35         }
  36
  37         /// Print a register name for disassembly given the unique
  38         /// dependence tag number (FP or int).
  39         void printReg(std::ostream &os, int reg) const;
  40
  41         std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
  42     };
  43
  44 }};
  45
  46 //Ouputs to decoder.cc
  47 output decoder {{
  48
  49     void MipsStaticInst::printReg(std::ostream &os, int reg) const
  50     {
  51         if (reg < FP_Base_DepTag) {
  52             ccprintf(os, "r%d", reg);
  53         }
  54         else {
  55             ccprintf(os, "f%d", reg - FP_Base_DepTag);
  56         }
  57     }
  58
  59     std::string MipsStaticInst::generateDisassembly(Addr pc, const SymbolTable *symtab) const
  60     {
  61         std::stringstream ss;
  62
  63         ccprintf(ss, "%-10s ", mnemonic);
  64
  65         if(_numDestRegs > 0){
  66             printReg(ss, _destRegIdx[0]);
  67         }
  68
  69         if(_numSrcRegs > 0) {
  70             ss << ",";
  71             printReg(ss, _srcRegIdx[0]);
  72         }
  73
  74         if(_numSrcRegs > 1) {
  75             ss << ",";
  76             printReg(ss, _srcRegIdx[1]);
  77         }
  78
  79
  80         if(mnemonic == "sll" || mnemonic == "sra"){
  81             ccprintf(ss,", %d",SA);
  82         }
  83
  84         return ss.str();
  85     }
  86
  87 }};
  88