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: --- 52 unchanged lines hidden (view full) --- 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 # code = "GenFault #${new UnimpInstFault}#\n" + code 133 print "%0" |
134 memTypes = copy.copy(opTypes) |
135 memTypes.pop(0) 136 memEnv = copy.copy(env) 137 return doSplitDecode(Name, specializeInst, "MODRM_MOD", 138 {"3" : (regTypes, memEnv)}, (memTypes, memEnv)) |
139 elif opType.tag in ("I", "J"): 140 # Immediates are already in the instruction, so don't leave in 141 # those parameters |
142 print "IMMEDIATE" |
143 elif opType.tag == "M": 144 # This needs to refer to memory, but we'll fill in the details 145 # later. It needs to take into account unaligned memory 146 # addresses. |
147 #code = "GenFault #${new UnimpInstFault}#\n" + code 148 print "%0" |
149 elif opType.tag in ("PR", "R", "VR"): 150 # There should probably be a check here to verify that mod 151 # is equal to 11b |
152 print "(uint8_t)MODRM_RM" |
153 else: 154 raise Exception, "Unrecognized tag %s." % opType.tag |
155 opTypes.pop(0) |
156 157 # At this point, we've built up "code" to have all the necessary extra 158 # instructions needed to implement whatever types of operands were 159 # specified. Now we'll assemble it it into a StaticInst. |
160 return genMacroop(Name, env) |
161}}; |