Accidentally didn't save when moving the specialization code out of here.
--HG-- extra : convert_revision : 1ffe0c497e10fef1eb84b3c97c00b98d820fbb97
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Gabe Black
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1 changed files with 0 additions and 116 deletions
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@ -55,122 +55,6 @@
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//
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// Authors: Gabe Black
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////////////////////////////////////////////////////////////////////
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//
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// Code to "specialize" a microcode sequence to use a particular
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// variety of operands
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//
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let {{
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# This code builds up a decode block which decodes based on switchval.
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# vals is a dict which matches case values with what should be decoded to.
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# builder is called on the exploded contents of "vals" values to generate
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# whatever code should be used.
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def doSplitDecode(name, Name, builder, switchVal, vals, default = None):
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header_output = ''
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decoder_output = ''
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decode_block = 'switch(%s) {\n' % switchVal
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exec_output = ''
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for (val, todo) in vals.items():
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(new_header_output,
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new_decoder_output,
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new_decode_block,
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new_exec_output) = builder(name, Name, *todo)
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header_output += new_header_output
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decoder_output += new_decoder_output
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decode_block += '\tcase %s: %s\n' % (val, new_decode_block)
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exec_output += new_exec_output
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if default:
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(new_header_output,
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new_decoder_output,
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new_decode_block,
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new_exec_output) = builder(name, Name, *default)
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header_output += new_header_output
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decoder_output += new_decoder_output
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decode_block += '\tdefault: %s\n' % new_decode_block
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exec_output += new_exec_output
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decode_block += '}\n'
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return (header_output, decoder_output, decode_block, exec_output)
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}};
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let {{
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class OpType(object):
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parser = re.compile(r"(?P<tag>[A-Z][A-Z]*)(?P<size>[a-z][a-z]*)|(r(?P<reg>[A-Za-z0-9][A-Za-z0-9]*))")
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def __init__(self, opTypeString):
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match = OpType.parser.search(opTypeString)
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if match == None:
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raise Exception, "Problem parsing operand type %s" % opTypeString
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self.reg = match.group("reg")
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self.tag = match.group("tag")
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self.size = match.group("size")
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# This function specializes the given piece of code to use a particular
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# set of argument types described by "opTypes". These are "implemented"
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# in reverse order.
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def specializeInst(name, Name, code, opTypes):
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opNum = len(opTypes) - 1
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while len(opTypes):
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# print "Building a composite op with tags", opTypes
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# print "And code", code
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opNum = len(opTypes) - 1
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# A regular expression to find the operand placeholders we're
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# interested in.
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opRe = re.compile("\\^(?P<operandNum>%d)(?=[^0-9]|$)" % opNum)
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# Parse the operand type strign we're working with
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opType = OpType(opTypes[opNum])
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if opType.reg:
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#Figure out what to do with fixed register operands
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if opType.reg in ("Ax", "Bx", "Cx", "Dx"):
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code = opRe.sub("%%{INTREG_R%s}" % opType.reg.upper(), code)
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elif opType.reg == "Al":
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# We need a way to specify register width
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code = opRe.sub("%{INTREG_RAX}", code)
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else:
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print "Didn't know how to encode fixed register %s!" % opType.reg
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elif opType.tag == None or opType.size == None:
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raise Exception, "Problem parsing operand tag: %s" % opType.tag
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elif opType.tag in ("C", "D", "G", "P", "S", "T", "V"):
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# Use the "reg" field of the ModRM byte to select the register
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code = opRe.sub("%{(uint8_t)MODRM_REG}", code)
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elif opType.tag in ("E", "Q", "W"):
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# This might refer to memory or to a register. We need to
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# divide it up farther.
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regCode = opRe.sub("%{(uint8_t)MODRM_RM}", code)
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regTypes = copy.copy(opTypes)
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regTypes.pop(-1)
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# This needs to refer to memory, but we'll fill in the details
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# later. It needs to take into account unaligned memory
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# addresses.
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memCode = opRe.sub("%0", code)
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memTypes = copy.copy(opTypes)
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memTypes.pop(-1)
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return doSplitDecode(name, Name, specializeInst, "MODRM_MOD",
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{"3" : (regCode, regTypes)}, (memCode, memTypes))
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elif opType.tag in ("I", "J"):
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# Immediates are already in the instruction, so don't leave in
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# those parameters
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code = opRe.sub("${IMMEDIATE}", code)
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elif opType.tag == "M":
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# This needs to refer to memory, but we'll fill in the details
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# later. It needs to take into account unaligned memory
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# addresses.
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code = opRe.sub("%0", code)
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elif opType.tag in ("PR", "R", "VR"):
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# There should probably be a check here to verify that mod
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# is equal to 11b
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code = opRe.sub("%{(uint8_t)MODRM_RM}", code)
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else:
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raise Exception, "Unrecognized tag %s." % opType.tag
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opTypes.pop(-1)
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# At this point, we've built up "code" to have all the necessary extra
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# instructions needed to implement whatever types of operands were
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# specified. Now we'll assemble it it into a StaticInst.
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return assembleMicro(name, Name, code)
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}};
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////////////////////////////////////////////////////////////////////
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//
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// The microcode assembler
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