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#1 2008-10-09 12:35:18

sam207
Member
Registered: 2008-03-17
Posts: 90

Help On call thing in assembly

What in fact does this call functions does?? I dunno much about this function.. So could u bother to explain about that.
Thanks in advance.


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#2 2008-10-09 15:58:32

sOwL
Member
Registered: 2007-09-16
Posts: 97

Re: Help On call thing in assembly

As far as i know, its about making an assembly part of code and calling it in a program made with a certain language (e.g C++) so it works with the code. You will need an assembler to write assembly code.


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#3 2008-10-09 20:34:38

sam207
Member
Registered: 2008-03-17
Posts: 90

Re: Help On call thing in assembly

I want to learn this for reverse engineering..
For example, there is a call like:
CALL app.00401150
& at 00401150, there is a code like this:
PUSHAD
& below that suppose following codes are present:
CMP BYTE PTR DS:[405190],0
JNZ SHORT app.00401152
etc. & etc.
So whenever call is made to 00401150, will all the codes below PUSHAD do their work & then return to the initial call or what? I m not getting this thing. So help..


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#4 2008-10-10 05:01:29

t0mmy9
Administrator
Registered: 2005-01-07
Posts: 21

Re: Help On call thing in assembly

ive never learned assembly, but tutorial #16 is helpful

CALL 200 - This calls another set of instructions at 200 then returns back to the next line after it was called

meaning it calls instructions at memory location 200 then goes back to where the call was set and keeps going from there.

I might be able to help you with that app cracking but i suggest reading the tutorial first.


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#5 2008-10-10 05:54:10

sOwL
Member
Registered: 2007-09-16
Posts: 97

Re: Help On call thing in assembly

i dont know assemly either, so i cant help you further. Do your own research, everything you need to know is out there smile Google is your friend


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#6 2008-10-10 08:23:07

sam207
Member
Registered: 2008-03-17
Posts: 90

Re: Help On call thing in assembly

thanks I found crackmes.de for some good practice...


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