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[problem] why this code wrong and how to fix it?

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eranj
How do I cheat?

Reputation: 0

Joined: 28 Feb 2010
Posts: 9

Posted: Fri Mar 05, 2010 4:22 am Post subject: [problem] why this code wrong and how to fix it?

Code:

[ENABLE]
//code from here to '[DISABLE]' will be used to enable the cheat
alloc(newmem,2048) //2kb should be enough
label(returnhere)
label(originalcode)
label(exit)

017A0000:
jmp newmem
returnhere:

newmem: //this is allocated memory, you have read,write,execute access

originalcode:
mov [ecx+0c],xmm0*3
exit:
jmp returnhere

[DISABLE]
//code from here till the end of the code will be used to disable the cheat
dealloc(newmem)
017A0000:
movss [ecx+0c],xmm0
//Alt: db F3 0F 11 41 0C

educofu
Expert Cheater

Reputation: 3

Joined: 21 Aug 2009
Posts: 171
Location: Brazil,MG,OP

Posted: Thu May 06, 2010 4:07 pm Post subject:

at 017A0000: lacking NOP's when [enabled] (not sure) [disable] OP wrote wrong: movss original code says that "xmm0*3" is moved, not just "xmm0" _________________ "I finally started thinking outside of the box, only to find myself in a larger box."

Dark Byte
Site Admin

Reputation: 470

Joined: 09 May 2003
Posts: 25777
Location: The netherlands

Posted: Thu May 06, 2010 4:37 pm Post subject:

Code:

Alt: db F3 0F 11 41 0C

This means the original instruction is "movss [ecx+c],xmm0"

the OP probably wants to multiply the value stored in xmm0 and then write it to [ecx+c]

seeing it's using movss (single precision scalar) you should probably use mulss
or even better just write the value you want at [ecx+0c]

e.g:

Code:

push eax
mov eax,(float)10000
mov [ecx+c],eax
pop eax

_________________

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