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[Bug?] Cheat Engine / OllyDbg Opcode Difference!

 
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Miaurice
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Joined: 03 Jul 2009
Posts: 21
Location: Germany
PostPosted: Tue Jun 26, 2012 7:46 am    Post subject: [Bug?] Cheat Engine / OllyDbg Opcode Difference! Reply with quote
Hey Dark Byte!
While creating some Anti-Debugging-Functions I found out something very odd..
Maybe I see it wrong, but I wanted to let you know..

I wanted to increase the last pushed DWORD by 80, so I entered the Opcode:
Code:
Add DWORD [ESP],80

The Byte Result was the following:


When I entered these Bytes in OllyDbg 2 the Byte Result was the following:

-80! Surprised

Thats a huge difference in my opinion!
Now since I spotted this (in my opinion) problem, I tried out what happened if I traced over this code. The thing OllyDbg 2 shows is correct. It decreases by 80. So Cheat Engine is mistaking there..


Same with the opposite Opcode..




Greetings,
Mi4uric3
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Dark Byte
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Joined: 09 May 2003
Posts: 25874
Location: The netherlands
PostPosted: Tue Jun 26, 2012 11:44 am    Post subject: Reply with quote
I'll check it out
In the meantime, use "Add DWORD [ESP],00000080"

*fixed in svn
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