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A comment on Breaking the x86 Instruction Set: how to find undocumented x86 instructions. Parent comment

Re:Breaking the x86 Instruction Set: how to find undocumente... by dfox on Monday September 11, 2017 @08:01AM (#15217822)
i386 instruction decoding at least partially depend on what descriptor is loaded into (shadow) CS. For example the effects of 0x66 prefix are reversed between 16b and 32b code.
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