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bug?

 
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yui0900826
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PostPosted: Wed Nov 14, 2012 11:00 am    Post subject: bug? Reply with quote
Shocked Shocked Shocked Shocked

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Dark Byte
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PostPosted: Wed Nov 14, 2012 12:40 pm    Post subject: Reply with quote
No, it's correct

A 64-bit process needs an address filled with the target address to be able to jump to it while a 32-bit process does not

The address of "sleep" in a 32-bit process is 75391100
The address of "sleep" in a 64-bit process is 7fefd611140

A direct call only has a max range of 32-bit , but to get to 7fefd611140 from 2eb0010 you need to go a distance bigger than a 32-bit value can specify, so an indirect call is needed

your "call sleep" gets rewritten to:
Code:

call [addresswithsleep]
jmp afteraddresswithsleep

addresswithsleep:
dq 7fefd611140

afteraddresswithsleep:



Also, if your target process is 64-bit you also must use the calling convention of 64-bit
Code:

push #1000
call sleep

is not valid for a 64-bit target

use something like this
Code:

sub rsp,28
mov rcx,#1000
call sleep
add rsp,28


Also, in 64-bit RAX, RCX, RDX, R8, R9, R10, R11 can be modified by a function call like sleep, so make sure those are not important, or store them. (make sure the stack stays aligned though)

Of course since there aren't that many 64-bit games out right now I doubt you have to worry about this much
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Last edited by Dark Byte on Wed Nov 14, 2012 12:55 pm; edited 1 time in total
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yui0900826
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PostPosted: Wed Nov 14, 2012 12:55 pm    Post subject: Reply with quote
thank you! Idea Idea
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