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

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

// Copyright (c) 2007 The Hewlett-Packard Development Company
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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
        };
}};

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

// Basic instruction class declaration template.
def template MacroDeclare {{
        namespace X86Macroop
        {
            /**
             * Static instruction class for "%(mnemonic)s".
             */
            class %(class_name)s : public %(base_class)s
            {
              private:
                %(declareLabels)s
              public:
                // Constructor.
                %(class_name)s(ExtMachInst machInst, X86ISA::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)
        {
            %(adjust_env)s;
            %(do_modrm)s;
            %(constructor)s;
            //alloc_microops is the code that sets up the microops
            //array in the parent class.
            %(alloc_microops)s;
        }
}};

let {{
    from micro_asm import Combinational_Macroop, Rom_Macroop
    class X86Macroop(Combinational_Macroop):
        def add_microop(self, mnemonic, microop):
            microop.mnemonic = mnemonic
            microop.micropc = len(self.microops)
            self.microops.append(microop)
        def setAdjustEnv(self, val):
            self.adjust_env = val
        def __init__(self, name):
            super(X86Macroop, self).__init__(name)
            self.directives = {
                "adjust_env" : self.setAdjustEnv
            }
            self.declared = False
            self.adjust_env = ""
            self.doModRM = ""
        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
            declareLabels = ""
            for (label, microop) in self.labels.items():
                declareLabels += "const static uint64_t label_%s = %d;\n" \
                                  % (label, microop.micropc)
            iop = InstObjParams(self.name, self.name, "Macroop",
                    {"code" : "",
                     "declareLabels" : declareLabels
                    })
            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,
                                 "adjust_env" : self.adjust_env,
                                 "do_modrm" : self.doModRM})
            return MacroConstructor.subst(iop);
}};

let {{
    class EmulEnv(object):
        def __init__(self):
            self.reg = "0"
            self.regUsed = False
            self.regm = "0"
            self.regmUsed = False
            self.seg = "SEGMENT_REG_DS"
            self.size = None
            self.addressSize = "ADDRSIZE"
            self.dataSize = "OPSIZE"
            self.stackSize = "STACKSIZE"
            self.doModRM = False

        def getAllocator(self):
            if self.size == 'b':
                self.dataSize = 1
            elif self.size == 'd':
                self.dataSize = 4
            #This is for "double plus" which is normally a double word unless
            #the REX W bit is set, in which case it's a quad word. It's used
            #for some SSE instructions.
            elif self.size == 'dp':
                self.dataSize = "(REX_W ? 8 : 4)"
            elif self.size == 'q':
                self.dataSize = 8
            elif self.size == 'v':
                self.dataSize = "OPSIZE"
            elif self.size == 'w':
                self.dataSize = 2
            elif self.size == 'z':
                self.dataSize = "((OPSIZE == 8) ? 4 : OPSIZE)"
            elif self.size:
                raise Exception, "Unrecognized size type %s!" % self.size
            return '''EmulEnv(%(reg)s,
                              %(regm)s,
                              %(dataSize)s,
                              %(addressSize)s,
                              %(stackSize)s)''' % \
                self.__dict__

        def addReg(self, reg):
            if not self.regUsed:
                self.reg = reg
                self.regUsed = True
            elif not self.regmUsed:
                self.regm = reg
                self.regmUsed = True
            else:
                raise Exception, "EmulEnv is out of register specialization spots."
        def setSize(self, size):
            if not self.size:
                self.size = size
            else:
                if self.size != size:
                    raise Exception, "Conflicting register sizes %s and %s!" %\
                        (self.size, size)
}};

let {{
    doModRMString = "env.doModRM(machInst);\n"
    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:
            if env.doModRM:
                macroop.doModRM = doModRMString
            blocks.header_output = macroop.getDeclaration()
            blocks.decoder_output = macroop.getDefinition()
            macroop.declared = True
        blocks.decode_block = "return %s;\n" % macroop.getAllocator(env)
        return blocks
}};