From 4285990a96bad869bc1046f28f99cf7f4b5c8de0 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Wed, 4 Apr 2007 14:31:59 +0000 Subject: Reworking how x86's isa description works. I'm adopting the following definitions to make figuring out what's what a little easier: MicroOp: A single operation actually implemented in hardware. MacroOp: A collection of microops which are executed as a unit. Instruction: An architected instruction which can be implemented with a macroop or a microop. --HG-- extra : convert_revision : 1cfc8409cc686c75220767839f55a30551aa6f13 --- src/arch/x86/isa/formats/multi.isa | 147 +++---------------------------------- 1 file changed, 11 insertions(+), 136 deletions(-) (limited to 'src/arch/x86/isa/formats') diff --git a/src/arch/x86/isa/formats/multi.isa b/src/arch/x86/isa/formats/multi.isa index 9fceec2b0..7ad5ecd48 100644 --- a/src/arch/x86/isa/formats/multi.isa +++ b/src/arch/x86/isa/formats/multi.isa @@ -61,151 +61,26 @@ // let {{ - # This builds either a regular or macro op to implement the sequence of - # ops we give it. - def genInst(name, Name, ops): - # If we can implement this instruction with exactly one microop, just - # use that directly. - newStmnt = '' - if len(ops) == 1: - decode_block = "return (X86StaticInst *)(%s);" % \ - ops[0].getAllocator() - return ('', '', decode_block, '') - else: - # Build a macroop to contain the sequence of microops we've - # been given. - return genMacroOp(name, Name, ops) + def doInst(name, Name, opTypeSet): + if not instDict.has_key(Name): + raise Exception, "Unrecognized instruction: %s" % Name + inst = instDict[Name]() + return inst.emit(opTypeSet) }}; -let {{ - # This code builds up a decode block which decodes based on switchval. - # vals is a dict which matches case values with what should be decoded to. - # builder is called on the exploded contents of "vals" values to generate - # whatever code should be used. - def doMultiOp(name, Name, builder, switchVal, vals, default = None): - header_output = '' - decoder_output = '' - decode_block = 'switch(%s) {\n' % switchVal - exec_output = '' - for (val, todo) in vals.items(): - (new_header_output, - new_decoder_output, - new_decode_block, - new_exec_output) = builder(name, Name, *todo) - header_output += new_header_output - decoder_output += new_decoder_output - decode_block += '\tcase %s: %s\n' % (val, new_decode_block) - exec_output += new_exec_output - if default: - (new_header_output, - new_decoder_output, - new_decode_block, - new_exec_output) = builder(name, Name, *default) - header_output += new_header_output - decoder_output += new_decoder_output - decode_block += '\tdefault: %s\n' % new_decode_block - exec_output += new_exec_output - decode_block += '}\n' - return (header_output, decoder_output, decode_block, exec_output) -}}; - -let {{ - - # This function specializes the given piece of code to use a particular - # set of argument types described by "opTags". These are "implemented" - # in reverse order. - def doCompOps(name, Name, code, opTags, postfix): - opNum = len(opTags) - 1 - while len(opTags): - # print "Building a composite op with tags", opTags - # print "And code", code - opNum = len(opTags) - 1 - # A regular expression to find the operand placeholders we're - # interested in. - opRe = re.compile("%%(?P%d)(?=[^0-9]|$)" % opNum) - tag = opTags[opNum] - # Build up a name for this instructions class using the argument - # types. Each variation will get its own name this way. - postfix = '_' + tag + postfix - tagParser = re.compile(r"(?P[A-Z][A-Z]*)(?P[a-z][a-z]*)|(r(?P[A-Za-z0-9][A-Za-z0-9]*))") - tagMatch = tagParser.search(tag) - if tagMatch == None: - raise Exception, "Problem parsing operand tag %s" % tag - reg = tagMatch.group("tagReg") - tagType = tagMatch.group("tagType") - tagSize = tagMatch.group("tagSize") - if reg: - #Figure out what to do with fixed register operands - if reg in ("Ax", "Bx", "Cx", "Dx"): - code = opRe.sub("{INTREG_R%s}" % reg.upper(), code) - elif reg == "Al": - # We need a way to specify register width - code = opRe.sub("{INTREG_RAX}", code) - else: - print "Didn't know how to encode fixed register %s!" % reg - elif tagType == None or tagSize == None: - raise Exception, "Problem parsing operand tag: %s" % tag - elif tagType == "C" or tagType == "D" or tagType == "G" or \ - tagType == "P" or tagType == "S" or \ - tagType == "T" or tagType == "V": - # Use the "reg" field of the ModRM byte to select the register - code = opRe.sub("{(uint8_t)MODRM_REG}", code) - elif tagType == "E" or tagType == "Q" or tagType == "W": - # This might refer to memory or to a register. We need to - # divide it up farther. - regCode = opRe.sub("{(uint8_t)MODRM_RM}", code) - regTags = copy.copy(opTags) - regTags.pop(-1) - # This needs to refer to memory, but we'll fill in the details - # later. It needs to take into account unaligned memory - # addresses. - memCode = opRe.sub("0", code) - memTags = copy.copy(opTags) - memTags.pop(-1) - return doMultiOp(name, Name, doCompOps, "MODRM_MOD", - {"3" : (regCode, regTags, postfix)}, - (memCode, memTags, postfix)) - elif tagType == "I" or tagType == "J": - # Substitute in an immediate - code = opRe.sub("{IMMEDIATE}", code) - elif tagType == "M": - # This needs to refer to memory, but we'll fill in the details - # later. It needs to take into account unaligned memory - # addresses. - code = opRe.sub("0", code) - elif tagType == "PR" or tagType == "R" or tagType == "VR": - # There should probably be a check here to verify that mod - # is equal to 11b - code = opRe.sub("{(uint8_t)MODRM_RM}", code) - else: - raise Exception, "Unrecognized tag %s." % tag - opTags.pop(-1) - - # At this point, we've built up "code" to have all the necessary extra - # instructions needed to implement whatever types of operands were - # specified. Now we'll assemble it it into a microOp sequence. - ops = assembleMicro(code) - - # Build a macroop to contain the sequence of microops we've - # constructed. The decode block will be used to fill in our - # inner decode structure, and the rest will be concatenated and - # passed back. - return genInst(name, Name + postfix, ops) -}}; - -def format TaggedOp(code, tagSet) {{ +def format Inst(*opTypeSet) {{ (header_output, decoder_output, decode_block, - exec_output) = doCompOps(name, Name, code, tagSet, '') + exec_output) = doInst(name, Name, list(opTypeSet)) }}; -def format MultiOp(code, switchVal, opTags, *opt_flags) {{ +def format MultiInst(switchVal, *opTypeSets) {{ switcher = {} - for (count, tagSet) in zip(xrange(len(opTags) - 1), opTags): - switcher[count] = (code, tagSet, '') + for (count, opTypeSet) in zip(xrange(len(opTypeSets)), opTypeSets): + switcher[count] = (opTypeSet,) (header_output, decoder_output, decode_block, - exec_output) = doMultiOp(name, Name, doCompOps, switchVal, switcher) + exec_output) = doSplitDecode(name, Name, doInst, switchVal, switcher) }}; -- cgit v1.2.3