base.isa revision 5202:ff56fa8c2091 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2006 The Regents of The University of Michigan
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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
37output 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, int reg) const;
57
58        std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
59    };
60
61}};
62
63//Ouputs to decoder.cc
64output decoder {{
65
66    void MipsStaticInst::printReg(std::ostream &os, int reg) const
67    {
68        if (reg < FP_Base_DepTag) {
69            ccprintf(os, "r%d", reg);
70        }
71        else {
72            ccprintf(os, "f%d", reg - FP_Base_DepTag);
73        }
74    }
75
76    std::string MipsStaticInst::generateDisassembly(Addr pc, const SymbolTable *symtab) const
77    {
78        std::stringstream ss;
79
80        ccprintf(ss, "%-10s ", mnemonic);
81
82        // Need to find standard way to not print
83        // this info. Maybe add bool variable to
84        // class?
85        if (strcmp(mnemonic, "syscall") != 0) {
86            if(_numDestRegs > 0){
87                printReg(ss, _destRegIdx[0]);
88            }
89
90            if(_numSrcRegs > 0) {
91                ss << ", ";
92                printReg(ss, _srcRegIdx[0]);
93            }
94
95            if(_numSrcRegs > 1) {
96                ss << ", ";
97                printReg(ss, _srcRegIdx[1]);
98            }
99        }
100
101        // Should we define a separate inst. class
102        // just for two insts?
103        if (strcmp(mnemonic, "sll") == 0 || strcmp(mnemonic, "sra") == 0) {
104            ccprintf(ss,", %d",SA);
105        }
106
107        return ss.str();
108    }
109
110}};
111
112