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UDBGRD, UDBGWR Undocumented Instructions #288

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Description

Intel processors only

UDBGRD

0F 0E
Hidden operands only
Reads from: rAX, rCX
Writes to: rDX, rBX

UDBGWR

0F 0F
Hidden operands only
Reads from: rAX, rCX, (rDX, rBX) / (rDX:rBX)
Writes to: rDX, rBX

Implemented through a new decoder mode

Paper: https://raw.githubusercontent.com/chip-red-pill/udbgInstr/main/paper/undocumented_x86_insts_for_uarch_control.pdf

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    A-decoderArea: DecoderC-enhancementCategory: Enhancement of existing featuresP-lowPriority: Low

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