Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: Petz who wrote (25752)	11/10/1997 11:37:00 AM
From: Ali Chen	of 1581611

Petz: <is this bad [Pentium] opcode 16 bits wide?> No, it is actually an invalid form of rare 64-bit instruction: "Compare and Exchange 8 Bytes", with LOCK prefix, LOCK CMPXCHG8B AX. The destination AX is already used in the instruction as a part of the source, so the conflict is apparent. However, the Pentium manual claims to set #UD exception in this case, but you know the result - deep OS crash. Of course, it is possible to run into this combination ocassionally with all these buggy programs, but who cares to calculate the probability? The point now is that the recipe is known for malicious people, and the threat for small ISP is real. Ali

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