base.isa revision 5222:bb733a878f85 
1// -*- mode:c++ -*-
2
3// Copyright .AN) 2007 MIPS Technologies, Inc.  All Rights Reserved
4
5//  This software is part of the M5 simulator.
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34
35//Authors: Korey L. Sewell
36
37////////////////////////////////////////////////////////////////////
38//
39// Base class for MIPS instructions, and some support functions
40//
41
42//Outputs to decoder.hh
43output header {{
44
45    using namespace MipsISA;
46
47    /**
48     * Base class for all MIPS static instructions.
49     */
50    class MipsStaticInst : public StaticInst
51    {
52      protected:
53
54        // Constructor
55        MipsStaticInst(const char *mnem, MachInst _machInst, OpClass __opClass)
56            : StaticInst(mnem, _machInst, __opClass)
57        {
58        }
59
60        /// Print a register name for disassembly given the unique
61        /// dependence tag number (FP or int).
62        void printReg(std::ostream &os, int reg) const;
63
64        std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
65    };
66
67}};
68
69//Ouputs to decoder.cc
70output decoder {{
71
72    void MipsStaticInst::printReg(std::ostream &os, int reg) const
73    {
74        if (reg < FP_Base_DepTag) {
75            ccprintf(os, "r%d", reg);
76        }
77        else {
78            ccprintf(os, "f%d", reg - FP_Base_DepTag);
79        }
80    }
81
82    std::string MipsStaticInst::generateDisassembly(Addr pc, const SymbolTable *symtab) const
83    {
84        std::stringstream ss;
85
86        ccprintf(ss, "%-10s ", mnemonic);
87
88        // Need to find standard way to not print
89        // this info. Maybe add bool variable to
90        // class?
91        if (mnemonic != "syscall") {
92            if(_numDestRegs > 0){
93                printReg(ss, _destRegIdx[0]);
94            }
95
96            if(_numSrcRegs > 0) {
97                ss << ", ";
98                printReg(ss, _srcRegIdx[0]);
99            }
100
101            if(_numSrcRegs > 1) {
102                ss << ", ";
103                printReg(ss, _srcRegIdx[1]);
104            }
105        }
106
107        // Should we define a separate inst. class
108        // just for two insts?
109        if(mnemonic == "sll" || mnemonic == "sra"){
110            ccprintf(ss,", %d",SA);
111        }
112
113        return ss.str();
114    }
115
116}};
117
118