specialize.isa revision 4532:106c0fb74f7c
1// -*- mode:c++ -*- 2 3// Copyright (c) 2007 The Hewlett-Packard Development Company 4// All rights reserved. 5// 6// Redistribution and use of this software in source and binary forms, 7// with or without modification, are permitted provided that the 8// following conditions are met: 9// 10// The software must be used only for Non-Commercial Use which means any 11// use which is NOT directed to receiving any direct monetary 12// compensation for, or commercial advantage from such use. Illustrative 13// examples of non-commercial use are academic research, personal study, 14// teaching, education and corporate research & development. 15// Illustrative examples of commercial use are distributing products for 16// commercial advantage and providing services using the software for 17// commercial advantage. 18// 19// If you wish to use this software or functionality therein that may be 20// covered by patents for commercial use, please contact: 21// Director of Intellectual Property Licensing 22// Office of Strategy and Technology 23// Hewlett-Packard Company 24// 1501 Page Mill Road 25// Palo Alto, California 94304 26// 27// Redistributions of source code must retain the above copyright notice, 28// this list of conditions and the following disclaimer. Redistributions 29// in binary form must reproduce the above copyright notice, this list of 30// conditions and the following disclaimer in the documentation and/or 31// other materials provided with the distribution. Neither the name of 32// the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its 33// contributors may be used to endorse or promote products derived from 34// this software without specific prior written permission. No right of 35// sublicense is granted herewith. Derivatives of the software and 36// output created using the software may be prepared, but only for 37// Non-Commercial Uses. Derivatives of the software may be shared with 38// others provided: (i) the others agree to abide by the list of 39// conditions herein which includes the Non-Commercial Use restrictions; 40// and (ii) such Derivatives of the software include the above copyright 41// notice to acknowledge the contribution from this software where 42// applicable, this list of conditions and the disclaimer below. 43// 44// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 45// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 46// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 47// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 48// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 49// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 50// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 51// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 52// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 53// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 54// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 55// 56// Authors: Gabe Black 57 58//////////////////////////////////////////////////////////////////// 59// 60// Code to "specialize" a microcode sequence to use a particular 61// variety of operands 62// 63 64let {{ 65 # This code builds up a decode block which decodes based on switchval. 66 # vals is a dict which matches case values with what should be decoded to. 67 # builder is called on the exploded contents of "vals" values to generate 68 # whatever code should be used. 69 def doSplitDecode(Name, builder, switchVal, vals, default = None): 70 decode_block = 'switch(%s) {\n' % switchVal 71 for (val, todo) in vals.items(): 72 new_block = builder(Name, *todo) 73 new_block = '\tcase %s: %s\n' % (val, new_block) 74 decode_block += new_block 75 if default: 76 new_block = builder(Name, *default) 77 new_block = '\tdefault: %s\n' % new_block 78 decode_block += new_block 79 decode_block += '}\n' 80 return decode_block 81}}; 82 83let {{ 84 class OpType(object): 85 parser = re.compile(r"(?P<tag>[A-Z][A-Z]*)(?P<size>[a-z][a-z]*)|(r(?P<reg>[A-Z0-9])(?P<rsize>[a-z]*))") 86 def __init__(self, opTypeString): 87 match = OpType.parser.search(opTypeString) 88 if match == None: 89 raise Exception, "Problem parsing operand type %s" % opTypeString 90 self.reg = match.group("reg") 91 self.tag = match.group("tag") 92 self.size = match.group("size") 93 self.rsize = match.group("rsize") 94 95 # This function specializes the given piece of code to use a particular 96 # set of argument types described by "opTypes". 97 def specializeInst(Name, opTypes, env): 98 while len(opTypes): 99 # print "Building a composite op with tags", opTypes 100 # print "And code", code 101 opNum = len(opTypes) - 1 102 103 # Parse the operand type string we're working with 104 opType = OpType(opTypes[opNum]) 105 106 if opType.reg: 107 #Figure out what to do with fixed register operands 108 #This is the index to use, so we should stick it some place. 109 print "INTREG_R%s" % (opType.reg + opType.size.upper()) 110 if opType.size: 111 if opType.rsize in ("l", "h", "b"): 112 print "byte" 113 elif opType.rsize == "x": 114 print "word" 115 else: 116 print "Didn't recognize fixed register size %s!" % opType.rsize 117 elif opType.tag == None or opType.size == None: 118 raise Exception, "Problem parsing operand tag: %s" % opType.tag 119 elif opType.tag in ("C", "D", "G", "P", "S", "T", "V"): 120 # Use the "reg" field of the ModRM byte to select the register 121 print "(uint8_t)MODRM_REG" 122 elif opType.tag in ("E", "Q", "W"): 123 # This might refer to memory or to a register. We need to 124 # divide it up farther. 125 print "(uint8_t)MODRM_RM" 126 regTypes = copy.copy(opTypes) 127 regTypes.pop(0) 128 regEnv = copy.copy(env) 129 # This needs to refer to memory, but we'll fill in the details 130 # later. It needs to take into account unaligned memory 131 # addresses. 132 print "%0" 133 memTypes = copy.copy(opTypes) 134 memTypes.pop(0) 135 memEnv = copy.copy(env) 136 return doSplitDecode(Name, specializeInst, "MODRM_MOD", 137 {"3" : (regTypes, memEnv)}, (memTypes, memEnv)) 138 elif opType.tag in ("I", "J"): 139 # Immediates 140 print "IMMEDIATE" 141 elif opType.tag == "M": 142 # This needs to refer to memory, but we'll fill in the details 143 # later. It needs to take into account unaligned memory 144 # addresses. 145 print "%0" 146 elif opType.tag in ("PR", "R", "VR"): 147 # There should probably be a check here to verify that mod 148 # is equal to 11b 149 print "(uint8_t)MODRM_RM" 150 else: 151 raise Exception, "Unrecognized tag %s." % opType.tag 152 opTypes.pop(0) 153 154 # Generate code to return a macroop of the given name which will 155 # operate in the given "emulation environment" 156 return genMacroop(Name, env) 157}}; 158