Incorrect CPU Flags Set After imul rax, rax, 0 Instruction Execution

[mojtabafalleh]

Hello Unicorn Team,

I've encountered an issue where executing the instruction:

imul rax, rax, 0
produces incorrect CPU flags in Unicorn's emulation compared to real hardware behavior.

[wtdcode]

What’s the difference?

…

________________________________ From: mojtabafalleh ***@***.***> Sent: Sunday, July 13, 2025 3:13:38 AM To: unicorn-engine/unicorn ***@***.***> Cc: Subscribed ***@***.***> Subject: [unicorn-engine/unicorn] Incorrect CPU Flags Set After imul rax, rax, 0 Instruction Execution (Issue #2212) [https://avatars.githubusercontent.com/u/28828665?s=20&v=4]mojtabafalleh created an issue (unicorn-engine/unicorn#2212)<#2212> Hello Unicorn Team, I've encountered an issue where executing the instruction: imul rax, rax, 0 produces incorrect CPU flags in Unicorn's emulation compared to real hardware behavior. — Reply to this email directly, view it on GitHub<#2212>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AHJULO6CRAUXLOV5PAQ26N33IFM6FAVCNFSM6AAAAACBMBZ5VGVHI2DSMVQWIX3LMV43ASLTON2WKOZTGIZDKNRYHA4TMNQ>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[mojtabafalleh]

real cpu = 0x206
unicorn = 0x46

[wtdcode]

How to reproduce?

[mojtabafalleh]

https://github.com/mojtabafalleh/anti_emulaion_unicorn
for test in unicorn :
https://sogen.dev/