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SAL instruction wrong behavior #1998

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cr3m opened this issue Sep 10, 2024 · 2 comments
Closed

SAL instruction wrong behavior #1998

cr3m opened this issue Sep 10, 2024 · 2 comments

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@cr3m
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cr3m commented Sep 10, 2024

I am using Unicorn-based emulator (Speakeasy) to emulate a sample but I saw that seems like the SAL instruction is not working properly

0x1401df85b: mem=0xd3cd2900000000f9
0x1401df85b: sal word ptr [rsp + r8 + 3], cl                             ; cf=0x0
0x1401df861: mem=0xd3cd2900000001f2
0x1401df861: inc rdx                                                     ; cf=0x1

The CF flag changed from 0 -> 1 while it shouldn't

SAL (or its synonym, SHL) shifts the bits of the operand upward. The high-order bit is shifted into the carry flag, and the low-order bit is set to 0.
@wtdcode
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wtdcode commented Sep 10, 2024

Seems dup of #1717

@wtdcode
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wtdcode commented Dec 29, 2024

Closing as no activities.

@wtdcode wtdcode closed this as completed Dec 29, 2024
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@cr3m @wtdcode