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ASM code strange behaviour

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CodeKiller
Advanced Cheater

Reputation: 0

Joined: 30 Jun 2009
Posts: 87

Posted: Tue Jan 01, 2013 12:01 am Post subject: ASM code strange behaviour

Hello all,

Here a piece of code :

Code:

newmem5:
push ecx
mov ecx, eax
add ecx, DC
mov [hull], ecx
pop ecx

originalcode5:
mov eax,[eax+000000DC]
jmp returnhere5

The strange thing is, when I use the hull address in the table the pointer is 0x100 lower than it should -compared to the eax+DC address ).
If the real address should be 012345 in the table it will be : 012245...
I have 4 times the same code (only the offset is changing) and for the 3 others it works fine.

I know I can just add myself the 100 offset or directly use the value and not the pointer but I want to make this thing clear.

Thanks !!!

Dark Byte
Site Admin

Reputation: 471

Joined: 09 May 2003
Posts: 25840
Location: The netherlands

Posted: Tue Jan 01, 2013 4:17 am Post subject:

You're using the sign extended version of add and dc is a negative value. (-36)
use

Code:

add ecx, 000000dc

instead
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