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UDBGRD, UDBGWR Undocumented Instructions #288

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ghost opened this issue Dec 15, 2021 · 0 comments
Open

UDBGRD, UDBGWR Undocumented Instructions #288

ghost opened this issue Dec 15, 2021 · 0 comments
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A-decoder Area: Decoder C-enhancement Category: Enhancement of existing features P-low Priority: Low

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ghost commented Dec 15, 2021

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
@athre0z athre0z added A-decoder Area: Decoder C-enhancement Category: Enhancement of existing features P-low Priority: Low labels Dec 18, 2021
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A-decoder Area: Decoder C-enhancement Category: Enhancement of existing features P-low Priority: Low
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