public Instruction decode(
byte[] bytesArray,
int index,
int instrStartIndex,
int segmentOverride,
int prefixes,
X86InstructionFactory factory) {
this.byteIndex = index;
this.instrStartIndex = instrStartIndex;
this.prefixes = prefixes;
int ModRM = readByte(bytesArray, byteIndex);
int rm = ModRM & 7;
FPInstructionDecoder instrDecoder = null;
instrDecoder = floatGRPMap[number][rm];
Instruction instr = null;
if (instrDecoder != null) {
instr =
instrDecoder.decode(
bytesArray, byteIndex, instrStartIndex, segmentOverride, prefixes, factory);
byteIndex = instrDecoder.getCurrentIndex();
} else {
instr = factory.newIllegalInstruction();
}
return instr;
}
public Instruction decode(
BinaryInputBuffer bytesArray,
int index,
int instrStartIndex,
int segmentOverride,
int prefixes,
X86InstructionFactory factory) {
this.byteIndex = index;
this.instrStartIndex = instrStartIndex;
this.prefixes = prefixes;
int ModRM = readByte(bytesArray, byteIndex);
int reg = (ModRM >> 3) & 7;
// int regOrOpcode = (ModRM >> 3) & 7;
// int rm = ModRM & 7;
int startIndexWithoutPrefix;
// JK: FWAIT was broken
if ((prefixes & PREFIX_FWAIT) != 0) startIndexWithoutPrefix = instrStartIndex + 1;
else startIndexWithoutPrefix = instrStartIndex;
int floatOpcode = InstructionDecoder.readByte(bytesArray, startIndexWithoutPrefix);
FPInstructionDecoder instrDecoder = null;
if (ModRM < 0xbf) {
instrDecoder = floatMapOne[floatOpcode - 0xd8][reg];
} else {
instrDecoder = floatMapTwo[floatOpcode - 0xd8][reg];
}
Instruction instr = null;
if (instrDecoder != null) {
instr =
instrDecoder.decode(
bytesArray, byteIndex, instrStartIndex, segmentOverride, prefixes, factory);
byteIndex = instrDecoder.getCurrentIndex();
}
return instr;
}