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FPU Stack Bug ?

 
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Hexist
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Joined: 07 Dec 2021
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PostPosted: Tue Sep 03, 2024 12:43 pm    Post subject: FPU Stack Bug ? Reply with quote

When using Cheat Engine 7.5, i observed that looking at the FPU register stack does not show the intended values. After using another debugger to observe the fpu stack, i concluded that i was right, here are the screenshots:


As seen on the Cheat Engine 7.5 screenshot, all the values seem to be the same values, whereas on the x86dbg screenshot, all values are different and these are the intended values.

My question is, is this behavior normal? How can i observe the state of FPU registers just like x86dbg on Cheat Engine ?



x86dbg.PNG
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x86dbg.PNG



ce.PNG
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ce.PNG


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Dark Byte
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PostPosted: Tue Sep 03, 2024 1:06 pm    Post subject: Reply with quote

it's a known issue yes (fixed)

try the 32-bit CE

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Hexist
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PostPosted: Tue Sep 03, 2024 4:08 pm    Post subject: Reply with quote

Dark Byte wrote:
it's a known issue yes (fixed)

try the 32-bit CE


Did this issue get fixed on x86_64 Cheat Engine aswell ?

Btw 32-bit cheat engine fixes the issue, thanks.
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Dark Byte
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PostPosted: Tue Sep 03, 2024 4:42 pm    Post subject: Reply with quote

It's an issue that only shows on the 64-bit CE as there was an issue with the fpu pointer for the context record of 32-bit contexts in the 64-bit CE. It's fixed for next version
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