gem5/arch/mips/isa/formats/int.isa

// -*- mode:c++ -*-

////////////////////////////////////////////////////////////////////
//
// Integer operate instructions
//

//Outputs to decoder.hh
output header {{
        /**
         * Base class for integer operations.
         */
        class IntOp : public MipsStaticInst
        {
                protected:

                /// Constructor
                IntOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
                                MipsStaticInst(mnem, _machInst, __opClass)
                {
                }

                std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
        };

        class IntImmOp : public MipsStaticInst
        {
                protected:
                uint16_t imm;

                /// Constructor
                IntImmOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
                                MipsStaticInst(mnem, _machInst, __opClass),imm(INTIMM)
                {
                }

                std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
        };

}};

//Outputs to decoder.cc
output decoder {{
        std::string IntOp::generateDisassembly(Addr pc, const SymbolTable *symtab) const
        {
                return "Disassembly of integer instruction\n";
        }

        std::string IntImmOp::generateDisassembly(Addr pc, const SymbolTable *symtab) const
        {
                return "Disassembly of integer immediate instruction\n";
        }
}};


// integer & FP operate instructions use Rd as dest, so check for
// Rd == 0 to detect nops
def template OperateNopCheckDecode {{
 {
     MipsStaticInst *i = new %(class_name)s(machInst);
     if (RD == 0) {
         i = makeNop(i);
     }
     return i;
 }
}};

//Used by decoder.isa
def format IntOp(code, *opt_flags) {{
        orig_code = code
        cblk = CodeBlock(code)

        # Figure out if we are creating a IntImmOp or a IntOp
        # by looking at the instruction name
        iop = InstObjParams(name, Name, 'IntOp', cblk, opt_flags)
        strlen = len(name)
        if name[strlen-1] == 'i' or name[strlen-2:] == 'iu':
            iop = InstObjParams(name, Name, 'IntImmOp', cblk, opt_flags)

        header_output = BasicDeclare.subst(iop)
        decoder_output = BasicConstructor.subst(iop)
        decode_block = OperateNopCheckDecode.subst(iop)
        exec_output = BasicExecute.subst(iop)
}};