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 combinationally generated 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 {{
        namespace X86Macroop
        {
            /**
             * Static instruction class for "%(mnemonic)s".
             */
            class %(class_name)s : public %(base_class)s
            {
              public:
                // Constructor.
                %(class_name)s(ExtMachInst machInst, EmulEnv env);
            };
        };
}};

// Basic instruction class constructor template.
def template MacroConstructor {{
        inline X86Macroop::%(class_name)s::%(class_name)s(ExtMachInst machInst, EmulEnv env)
            : %(base_class)s("%(mnemonic)s", machInst, %(num_microops)s)
        {
                %(constructor)s;
                //alloc_microops is the code that sets up the microops
                //array in the parent class.
                %(alloc_microops)s;
        }
}};

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

let {{
    from micro_asm import Combinational_Macroop, Rom_Macroop
    class X86Macroop(Combinational_Macroop):
        def __init__(self, name):
            super(X86Macroop, self).__init__(name)
            self.directives = {
            }
            self.declared = False
        def getAllocator(self, env):
            return "new X86Macroop::%s(machInst, %s)" % (self.name, env.getAllocator())
        def getDeclaration(self):
            #FIXME This first parameter should be the mnemonic. I need to
            #write some code which pulls that out
            iop = InstObjParams(self.name, self.name, "Macroop", {"code" : ""})
            return MacroDeclare.subst(iop);
        def getDefinition(self):
            #FIXME This first parameter should be the mnemonic. I need to
            #write some code which pulls that out
            numMicroops = len(self.microops)
            allocMicroops = ''
            micropc = 0
            for op in self.microops:
                allocMicroops += \
                    "microops[%d] = %s;\n" % \
                    (micropc, op.getAllocator(True, False,
                                              micropc == 0,
                                              micropc == numMicroops - 1))
                micropc += 1
            iop = InstObjParams(self.name, self.name, "Macroop",
                                {"code" : "", "num_microops" : numMicroops,
                                 "alloc_microops" : allocMicroops})
            return MacroConstructor.subst(iop);
}};

output header {{
    struct EmulEnv
    {
        X86ISA::RegIndex reg;
        X86ISA::RegIndex regm;
        uint64_t immediate;
        uint64_t displacement;
        int addressSize;
        int dataSize;

        EmulEnv(X86ISA::RegIndex _reg, X86ISA::RegIndex _regm,
                uint64_t _immediate, uint64_t _displacement,
                int _addressSize, int _dataSize) :
            reg(_reg), regm(_regm),
            immediate(_immediate), displacement(_displacement),
            addressSize(_addressSize), dataSize(_dataSize)
        {;}
    };
}};

let {{
    class EmulEnv(object):
        def __init__(self):
            self.reg = "0"
            self.regUsed = False
            self.regm = "0"
            self.regmUsed = False
            self.immediate = "IMMEDIATE"
            self.displacement = "DISPLACEMENT"
            self.addressSize = "ADDRSIZE"
            self.dataSize = "OPSIZE"
        def getAllocator(self):
            return '''EmulEnv(%(reg)s,
                              %(regm)s,
                              %(immediate)s,
                              %(displacement)s,
                              %(addressSize)s,
                              %(dataSize)s)''' % \
                self.__dict__
        def addReg(self, reg):
            print "Adding reg \"%s\"" % reg
            if not self.regUsed:
                print "Added as reg"
                self.reg = reg
                self.regUsed = True
            elif not self.regmUsed:
                print "Added as regm"
                self.regm = reg
                self.regmUsed = True
            else:
                raise Exception, "EmulEnv is out of register specialization spots."
}};

let {{
    def genMacroop(Name, env):
        blocks = OutputBlocks()
        if not macroopDict.has_key(Name):
            raise Exception, "Unrecognized instruction: %s" % Name
        macroop = macroopDict[Name]
        if not macroop.declared:
            blocks.header_output = macroop.getDeclaration()
            blocks.decoder_output = macroop.getDefinition()
            macroop.declared = True
        blocks.decode_block = "return %s;\n" % macroop.getAllocator(env)
        return blocks
}};