Old Intel instructions: MOV TRx, JMPE, FNSTDW, FSTSG, FRSTPM, LOADALL, etc #184
Labels
A-decoder
Area: Decoder
C-enhancement
Category: Enhancement of existing features
P-medium
Priority: Medium
Doing further digging, I've found a handful of instructions that have been supported by only a limited number of old Intel x86 processors and that Zydis doesn't recognize:
These seem kind-of straightforward, in that their encodings have never been reused for any other opcodes and will produce an UD on any modern processor.
Other instructions/opcodes are murkier:
I suppose the question then becomes - which, if any, of these, should Zydis recognize?
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