gem5/src/arch/x86/isa/microasm.isa

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

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// Authors: Gabe Black

//Include the definitions of the micro ops.
//These are python representations of static insts which stand on their own
//and make up an internal instruction set. They are used by the micro
//assembler.
##include "microops/microops.isa"

//Include code to build macroops in both C++ and python.
##include "macroop.isa"

//Include code to fill out the microcode ROM in both C++ and python.
##include "rom.isa"

let {{
    import sys
    sys.path[0:0] = ["src/arch/x86/isa/"]
    from insts import microcode
    # print microcode
    from micro_asm import MicroAssembler, Rom_Macroop
    mainRom = X86MicrocodeRom('main ROM')
    assembler = MicroAssembler(X86Macroop, microopClasses, mainRom, Rom_Macroop)

    def regIdx(idx):
        return "InstRegIndex(%s)" % idx

    assembler.symbols["regIdx"] = regIdx

    # Add in symbols for the microcode registers
    for num in range(16):
        assembler.symbols["t%d" % num] = regIdx("NUM_INTREGS+%d" % num)
    for num in range(8):
        assembler.symbols["ufp%d" % num] = \
            regIdx("FLOATREG_MICROFP(%d)" % num)
    # Add in symbols for the segment descriptor registers
    for letter in ("C", "D", "E", "F", "G", "H", "S"):
        assembler.symbols["%ss" % letter.lower()] = \
            regIdx("SEGMENT_REG_%sS" % letter)

    # Add in symbols for the various checks of segment selectors.
    for check in ("NoCheck", "CSCheck", "CallGateCheck", "IntGateCheck",
                  "SoftIntGateCheck", "SSCheck", "IretCheck", "IntCSCheck",
                  "TRCheck", "TSSCheck", "InGDTCheck", "LDTCheck"):
        assembler.symbols[check] = "Seg%s" % check

    for reg in ("TR", "IDTR"):
        assembler.symbols[reg.lower()] = regIdx("SYS_SEGMENT_REG_%s" % reg)

    for reg in ("TSL", "TSG"):
        assembler.symbols[reg.lower()] = regIdx("SEGMENT_REG_%s" % reg)

    # Miscellaneous symbols
    symbols = {
        "reg" : regIdx("env.reg"),
        "xmml" : regIdx("FLOATREG_XMM_LOW(env.reg)"),
        "xmmh" : regIdx("FLOATREG_XMM_HIGH(env.reg)"),
        "regm" : regIdx("env.regm"),
        "xmmlm" : regIdx("FLOATREG_XMM_LOW(env.regm)"),
        "xmmhm" : regIdx("FLOATREG_XMM_HIGH(env.regm)"),
        "mmx" : regIdx("FLOATREG_MMX(env.reg)"),
        "mmxm" : regIdx("FLOATREG_MMX(env.regm)"),
        "imm" : "adjustedImm",
        "disp" : "adjustedDisp",
        "seg" : regIdx("env.seg"),
        "scale" : "env.scale",
        "index" : regIdx("env.index"),
        "base" : regIdx("env.base"),
        "dsz" : "env.dataSize",
        "asz" : "env.addressSize",
        "ssz" : "env.stackSize"
    }
    assembler.symbols.update(symbols)

    assembler.symbols["ldsz"] = \
        "((env.dataSize == 8) ? 3 : (env.dataSize == 4) ? 2 : 1)"

    assembler.symbols["lasz"] = \
        "((env.addressSize == 8) ? 3 : (env.addressSize == 4) ? 2 : 1)"

    assembler.symbols["lssz"] = \
        "((env.stackSize == 8) ? 3 : (env.stackSize == 4) ? 2 : 1)"

    # Short hand for common scale-index-base combinations.
    assembler.symbols["sib"] = \
        [symbols["scale"], symbols["index"], symbols["base"]]
    assembler.symbols["riprel"] = \
        ["1", assembler.symbols["t0"], assembler.symbols["t7"]]

    # This segment selects an internal address space mapped to MSRs,
    # CPUID info, etc.
    assembler.symbols["intseg"] = regIdx("SEGMENT_REG_MS")
    # This segment always has base 0, and doesn't imply any special handling
    # like the internal segment above
    assembler.symbols["flatseg"] = regIdx("SEGMENT_REG_LS")

    for reg in ('ax', 'bx', 'cx', 'dx', 'sp', 'bp', 'si', 'di', \
                '8',  '9',  '10', '11', '12', '13', '14', '15'):
        assembler.symbols["r%s" % reg] = \
            regIdx("INTREG_R%s" % reg.upper())

    for reg in ('ah', 'bh', 'ch', 'dh'):
        assembler.symbols[reg] = \
            regIdx("INTREG_FOLDED(INTREG_%s, IntFoldBit)" % reg.upper())

    for reg in range(16):
        assembler.symbols["cr%d" % reg] = regIdx("MISCREG_CR%d" % reg)

    for flag in ('CF', 'PF', 'ECF', 'AF', 'EZF', 'ZF', 'SF', 'OF', \
                 'TF', 'IF', 'NT', 'RF', 'VM', 'AC', 'VIF', 'VIP', 'ID'):
        assembler.symbols[flag] = flag + "Bit"

    for cond in ('True', 'False', 'ECF', 'EZF', 'SZnZF',
                 'MSTRZ', 'STRZ', 'MSTRC',
                 'OF', 'CF', 'ZF', 'CvZF',
                 'SF', 'PF', 'SxOF', 'SxOvZF'):
        assembler.symbols["C%s" % cond] = "ConditionTests::%s" % cond
        assembler.symbols["nC%s" % cond] = "ConditionTests::Not%s" % cond
    assembler.symbols["CSTRZnEZF"] = "ConditionTests::STRZnEZF"
    assembler.symbols["CSTRnZnEZF"] = "ConditionTests::STRnZnEZF"

    assembler.symbols["CTrue"] = "ConditionTests::True"
    assembler.symbols["CFalse"] = "ConditionTests::False"

    for reg in ('sysenter_cs', 'sysenter_esp', 'sysenter_eip',
                'star', 'lstar', 'cstar', 'sf_mask',
                'kernel_gs_base'):
        assembler.symbols[reg] = regIdx("MISCREG_%s" % reg.upper())

    # Code literal which forces a default 64 bit operand size in 64 bit mode.
    assembler.symbols["oszIn64Override"] = '''
    if (machInst.mode.submode == SixtyFourBitMode &&
            env.dataSize == 4)
        env.dataSize = 8;
    '''

    assembler.symbols["maxOsz"] = '''
    if (machInst.mode.submode == SixtyFourBitMode)
        env.dataSize = 8;
    else
        env.dataSize = 4;
    '''

    def trimImm(width):
        return "adjustedImm = adjustedImm & mask(%s);" % width

    assembler.symbols["trimImm"] = trimImm

    def labeler(labelStr):
        return "label_%s" % labelStr

    assembler.symbols["label"] = labeler

    def rom_labeler(labelStr):
        return "romMicroPC(RomLabels::extern_label_%s)" % labelStr

    assembler.symbols["rom_label"] = rom_labeler

    def rom_local_labeler(labelStr):
        return "romMicroPC(RomLabels::label_%s)" % labelStr

    assembler.symbols["rom_local_label"] = rom_local_labeler

    def stack_index(index):
        return regIdx("NUM_FLOATREGS + (((%s) + 8) %% 8)" % index)

    assembler.symbols["st"] = stack_index

    macroopDict = assembler.assemble(microcode)

    decoder_output += mainRom.getDefinition()
    header_output += mainRom.getDeclaration()
}};