base.isa revision 2632:1bb2f91485ea 
1// -*- mode:c++ -*-
2
3////////////////////////////////////////////////////////////////////
4//
5// Base class for MIPS instructions, and some support functions
6//
7
8//Outputs to decoder.hh
9output 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
47output 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
89