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creating an asm opcode

 
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Effection
How do I cheat?
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Joined: 25 Mar 2007
Posts: 5
PostPosted: Mon Jun 25, 2007 5:15 am    Post subject: creating an asm opcode Reply with quote
Don't ask why I'll +Rep... my code is dynamically allocated and inserted into a program and i need to be able to create a "call" and "jmp" op code to the start address and to a function used by the code.
In mips its easy enough for a jal,
(0x0C000000 | (0x03FFFFFF & ((u32)address >> 2)))
but i cant find out how to do it for x86 Crying or Very sad
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Uzeil
Moderator
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Joined: 21 Oct 2006
Posts: 2411
PostPosted: Mon Jun 25, 2007 5:55 am    Post subject: Reply with quote
First byte is a 0xe9, then the next 4 are (addressto-(addressfrom+5)), which can also be written as (addressto-addressfrom-5).
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Mini Engine v3.0
Mipla v1.0

Reposted old threads out of the MS section.
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assaf84
Expert Cheater
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Joined: 03 Oct 2006
Posts: 238
PostPosted: Mon Jun 25, 2007 6:05 am    Post subject: Reply with quote
I just used this thing a while ago, I checked manually with CheatEngine - I've allocated some memory, added a JMP and start changing values.. about 2 mins..
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Effection
How do I cheat?
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Joined: 25 Mar 2007
Posts: 5
PostPosted: Mon Jun 25, 2007 1:25 pm    Post subject: Reply with quote
Thankyou Uzeil! Very Happy is this the same for "call" with the first byte being 0xe8 ?
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