gem5/src/arch/x86/isa/macroop.isa

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

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// Authors: Gabe Black

//////////////////////////////////////////////////////////////////////////////
//
//  Architecture independent
//

// Execute method for macroops.
def template MacroExecPanic {{
        Fault execute(%(CPU_exec_context)s *, Trace::InstRecord *) const
        {
            panic("Tried to execute macroop directly!");
            return NoFault;
        }
}};

output header {{

        // Base class for macroops
        class MacroOp : public StaticInst
        {
          protected:
            const uint32_t numMicroOps;

            //Constructor.
            MacroOp(const char *mnem, ExtMachInst _machInst,
                    uint32_t _numMicroOps)
                        : StaticInst(mnem, _machInst, No_OpClass),
                        numMicroOps(_numMicroOps)
            {
                assert(numMicroOps);
                microOps = new StaticInstPtr[numMicroOps];
                flags[IsMacroOp] = true;
            }

            ~MacroOp()
            {
                delete [] microOps;
            }

            StaticInstPtr * microOps;

            StaticInstPtr fetchMicroOp(MicroPC microPC)
            {
                assert(microPC < numMicroOps);
                return microOps[microPC];
            }

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

            %(MacroExecPanic)s
        };
}};

// Basic instruction class declaration template.
def template MacroDeclare {{
        /**
         * Static instruction class for "%(mnemonic)s".
         */
        class %(class_name)s : public %(base_class)s
        {
          public:
            // Constructor.
            %(class_name)s(ExtMachInst machInst);
        };
}};

// Basic instruction class constructor template.
def template MacroConstructor {{
        inline %(class_name)s::%(class_name)s(ExtMachInst machInst)
            : %(base_class)s("%(mnemonic)s", machInst, %(num_micro_ops)s)
        {
                %(constructor)s;
                //alloc_micro_ops is the code that sets up the microOps
                //array in the parent class.
                %(alloc_micro_ops)s;
        }
}};

//////////////////////////////////////////////////////////////////////////////
//
//  X86 specific
//

let {{
    def genMacroOp(name, Name, opSeq):
        numMicroOps = len(opSeq)
        allocMicroOps = ''
        micropc = 0
        for op in opSeq:
            allocMicroOps += \
                "microOps[%d] = %s;\n" % \
                (micropc, op.getAllocator('"' + name + '"', True, False,
                                          #op.delayed,
                                          micropc == 0,
                                          micropc == numMicroOps - 1))
            micropc += 1
        iop = InstObjParams(name, Name, 'MacroOp',
                {'code' : '', 'num_micro_ops' : numMicroOps,
                'alloc_micro_ops' : allocMicroOps})
        header_output = MacroDeclare.subst(iop)
        decoder_output = MacroConstructor.subst(iop)
        decode_block = BasicDecode.subst(iop)
        exec_output = ''
        return (header_output, decoder_output, decode_block, exec_output)
}};