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: --- 53 unchanged lines hidden (view full) --- 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 blocks = OutputBlocks() 71 blocks.decode_block = 'switch(%s) {\n' % switchVal |
72 for (val, todo) in vals.items(): |
73 new_blocks = builder(Name, *todo) 74 new_blocks.decode_block = \ 75 '\tcase %s: %s\n' % (val, new_blocks.decode_block) 76 blocks.append(new_blocks) |
77 if default: |
78 new_blocks = builder(Name, *default) 79 new_blocks.decode_block = \ 80 '\tdefault: %s\n' % new_blocks.decode_block 81 blocks.append(new_blocks) 82 blocks.decode_block += '}\n' 83 return blocks |
84}}; 85 86let {{ 87 class OpType(object): 88 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]*))") 89 def __init__(self, opTypeString): 90 match = OpType.parser.search(opTypeString) 91 if match == None: 92 raise Exception, "Problem parsing operand type %s" % opTypeString 93 self.reg = match.group("reg") 94 self.tag = match.group("tag") 95 self.size = match.group("size") 96 self.rsize = match.group("rsize") 97 98 # This function specializes the given piece of code to use a particular 99 # set of argument types described by "opTypes". 100 def specializeInst(Name, opTypes, env): |
101 print "Specializing %s with opTypes %s" % (Name, opTypes) |
102 while len(opTypes): |
103 # Parse the operand type string we're working with |
104 opType = OpType(opTypes[0]) |
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 if opType.reg in ("A", "B", "C", "D"): 110 env.addReg("INTREG_R%sX" % opType.reg) 111 else: 112 env.addReg("INTREG_R%s" % opType.reg) |
113 if opType.size: 114 if opType.rsize in ("l", "h", "b"): 115 print "byte" 116 elif opType.rsize == "x": 117 print "word" 118 else: 119 print "Didn't recognize fixed register size %s!" % opType.rsize 120 elif opType.tag == None or opType.size == None: 121 raise Exception, "Problem parsing operand tag: %s" % opType.tag 122 elif opType.tag in ("C", "D", "G", "P", "S", "T", "V"): 123 # Use the "reg" field of the ModRM byte to select the register |
124 env.addReg("(uint8_t)MODRM_REG") |
125 elif opType.tag in ("E", "Q", "W"): 126 # This might refer to memory or to a register. We need to 127 # divide it up farther. |
128 regTypes = copy.copy(opTypes) 129 regTypes.pop(0) 130 regEnv = copy.copy(env) |
131 regEnv.addReg("(uint8_t)MODRM_RM") |
132 # This needs to refer to memory, but we'll fill in the details 133 # later. It needs to take into account unaligned memory 134 # addresses. |
135 memTypes = copy.copy(opTypes) 136 memTypes.pop(0) 137 memEnv = copy.copy(env) |
138 print "%0" |
139 return doSplitDecode(Name, specializeInst, "MODRM_MOD", |
140 {"3" : (regTypes, regEnv)}, (memTypes, memEnv)) |
141 elif opType.tag in ("I", "J"): 142 # Immediates 143 print "IMMEDIATE" 144 elif opType.tag == "M": 145 # This needs to refer to memory, but we'll fill in the details 146 # later. It needs to take into account unaligned memory 147 # addresses. 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 env.addReg("(uint8_t)MODRM_RM") |
153 else: 154 raise Exception, "Unrecognized tag %s." % opType.tag 155 opTypes.pop(0) 156 157 # Generate code to return a macroop of the given name which will 158 # operate in the given "emulation environment" 159 return genMacroop(Name, env) 160}}; |