Add a microcode assembler. A microcode "program" is a series of statements. Each statement has an optional label at the beginning, a capitilized microcode class name which is roughly equivalent to a mnemonic in a regular ISA, and then an optional series of operands seperated by white space. The operands are either a decimal constant, a label, or a code fragment surrounded by non nested {}s. Labels are a letter or underscore followed by letters, underscores, or digits. The syntax for describing code segments might need to be changed if a need arrises to have {}s in the code itself.
--HG-- extra : convert_revision : 8e5cfdd1a3c9a7e3731fdf6acd615ee82ac2b9b7
This commit is contained in:
Gabe Black
parent
5c4cc4b552
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@ -72,6 +72,9 @@
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namespace X86ISA;
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//Include the simple microcode assembler
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##include "microasm.isa"
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//Include the bitfield definitions
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##include "bitfields.isa"
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172
src/arch/x86/isa/microasm.isa
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172
src/arch/x86/isa/microasm.isa
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@ -0,0 +1,172 @@
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// -*- mode:c++ -*-
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// Copyright (c) 2007 The Hewlett-Packard Development Company
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// All rights reserved.
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//
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// Redistribution and use of this software in source and binary forms,
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// with or without modification, are permitted provided that the
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// following conditions are met:
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//
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// The software must be used only for Non-Commercial Use which means any
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// use which is NOT directed to receiving any direct monetary
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// compensation for, or commercial advantage from such use. Illustrative
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// examples of non-commercial use are academic research, personal study,
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// teaching, education and corporate research & development.
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// Illustrative examples of commercial use are distributing products for
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// commercial advantage and providing services using the software for
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// commercial advantage.
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//
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// If you wish to use this software or functionality therein that may be
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// covered by patents for commercial use, please contact:
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// Director of Intellectual Property Licensing
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// Office of Strategy and Technology
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// Hewlett-Packard Company
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// 1501 Page Mill Road
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// Palo Alto, California 94304
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//
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// Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer. Redistributions
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// in binary form must reproduce the above copyright notice, this list of
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// conditions and the following disclaimer in the documentation and/or
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// other materials provided with the distribution. Neither the name of
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// the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission. No right of
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// sublicense is granted herewith. Derivatives of the software and
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// output created using the software may be prepared, but only for
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// Non-Commercial Uses. Derivatives of the software may be shared with
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// others provided: (i) the others agree to abide by the list of
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// conditions herein which includes the Non-Commercial Use restrictions;
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// and (ii) such Derivatives of the software include the above copyright
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// notice to acknowledge the contribution from this software where
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// applicable, this list of conditions and the disclaimer below.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 "assemble" microcode sequences
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//
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let {{
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class MicroOpStatement:
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def __init__(self):
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self.className = ''
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self.label = ''
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self.args = []
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def getAllocator(self, labelDict = {}):
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args = ''
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for arg in self.args:
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if arg.has_key("operandConst"):
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args += ", %s" % arg["operandConst"]
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elif arg.has_key("operandCode"):
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args += ", %s" % arg["operandCode"]
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elif arg.has_key("operandLabel"):
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if not labelDict.has_key(arg["operandLabel"]):
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print "Unrecognized label %s!" % arg["operandLabel"]
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args += ", %s" % labelDict[arg["operandLabel"]]
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else:
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print "Unrecognized operand type!"
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return 'new %s(machInst %s)' % (self.className, args)
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def assembleMicro(code):
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# This function takes in a block of microcode assembly and returns
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# a python list of objects which describe it.
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# Keep this around in case we need it later
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orig_code = code
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# A list of the statements we've found thus far
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statements = []
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# Regular expressions to pull each piece of the statement out at a
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# time. Each expression expects the thing it's looking for to be at
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# the beginning of the line, so the previous component is stripped
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# before continuing.
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labelRe = re.compile(r'^[ \t]*(?P<label>[a-zA-Z_]\w*)[ \t]:')
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lineRe = re.compile(r'^(?P<line>[^\n][^\n]*)$')
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classRe = re.compile(r'^[ \t]*(?P<className>[a-zA-Z_]\w*)')
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# This recognizes three different flavors of operands:
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# 1. Raw decimal numbers composed of digits between 0 and 9
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# 2. Code beginning with "{" and continuing until the first "}"
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# ^ This one might need revising
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# 3. A label, which starts with a capital or small letter, or
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# underscore, which is optionally followed by a sequence of
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# capital or small letters, underscores, or digts between 0 and 9
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opRe = re.compile( \
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r'^[ \t]*((?P<operandLabel>[a-zA-Z_]\w*)|(?P<operandConst>[0-9][0-9]*)|(\{(?P<operandCode>[^}]*)\}))')
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lineMatch = lineRe.search(code)
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while lineMatch != None:
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statement = MicroOpStatement()
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# Get a line and seperate it from the rest of the code
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line = lineMatch.group("line")
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print "Parsing line %s" % line
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code = lineRe.sub('', code, 1)
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# Find the label, if any
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labelMatch = labelRe.search(line)
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if labelMatch != None:
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statement.label = labelMatch.group("label")
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print "Found label %s." % statement.label
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# Clear the label from the statement
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line = labelRe.sub('', line, 1)
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# Find the class name which is roughly equivalent to the op name
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classMatch = classRe.search(line)
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if classMatch == None:
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print "Oh no! I can't find what instruction you want!"
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print "I should really bail out here, but I don't know how!"
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else:
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statement.className = classMatch.group("className")
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print "Found class name %s." % statement.className
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# Clear the class name from the statement
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line = classRe.sub('', line, 1)
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#Find as many arguments as you can
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statement.args = []
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opMatch = opRe.search(line)
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while opMatch is not None:
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statement.args.append({})
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# args is a list of dicts which collect different
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# representations of operand values. Different forms might be
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# needed in different places, for instance to replace a label
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# with an offset.
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for opType in ("operandLabel", "operandConst", "operandCode"):
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if opMatch.group(opType):
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statement.args[-1][opType] = opMatch.group(opType)
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if len(statement.args[-1]) == 0:
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print "I had a problem parsing an operand!"
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line = opRe.sub('', line, 1)
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print "Found operand %s." % statement.args[-1]
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opMatch = opRe.search(line)
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print "Found operands", statement.args
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# Add this statement to our collection
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statements.append(statement)
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# Get the next line
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lineMatch = lineRe.search(code)
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return statements
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def buildLabelDict(ops):
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labels = {}
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count = 0
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for op in ops:
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if op.label:
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labels[op.label] = count
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count += 1
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}};
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