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Incorrect decoding: REPNZ XSTORE #38

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woodruffw opened this issue Jan 15, 2021 · 0 comments
Closed

Incorrect decoding: REPNZ XSTORE #38

woodruffw opened this issue Jan 15, 2021 · 0 comments

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@woodruffw
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woodruffw commented Jan 15, 2021 •
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bddisasm currently allows an f3/REPNZ prefix in front of a Via PadLock XSTORE, but VIA lists this as undefined:

image

Example instructions (via mishegos):

  ./src/worker/xed/xed.so ./src/worker/zydis/zydis.so ./src/worker/bddisasm/bddisasm.so ./src/worker/iced/iced.so
2e6667f20fa7c0 (0 / 0) (0 / 0) REPNZ XSTORE (7 / 12) addr32 repnz xstore (7 / 19)
f267470fa7c0 (0 / 0) (0 / 0) REPNZ XSTORE (6 / 12) addr32 repnz xstore (6 / 19)
65f267470fa7c0 (0 / 0) (0 / 0) REPNZ XSTORE (7 / 12) addr32 repnz xstore (7 / 19)
3e65f267470fa7c0 (0 / 0) (0 / 0) REPNZ XSTORE (8 / 12) addr32 repnz xstore (8 / 19)

Similarly: REPNZ is undefined in front of XCRYPT, XSHA, and MONTMUL.
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dependabot(deps): bump bddisasm from ea28907 to fccf119 bbosinta/hvmi
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@woodruffw