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Trouble with tracing back a constant

 
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daru
How do I cheat?
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PostPosted: Sun Jan 06, 2019 8:33 am    Post subject: Trouble with tracing back a constant Reply with quote
I want to create a list of certain objects in a game. I believe I have found the game's code which iterates through a list of those objects and I want to replicate it. However, one of the constants used in the function I traced back lead to this instruction:
Code:

lea rsi, [rsp+30]

Which to my understanding is the same thing as saying rsi = rsp + 30.
I do not know where to go with this as I was expecting to eventually trace rsi back to some simple constant value. Is there anything I should look out for, or perhaps a different approach I should take? I apologize if this is extremely vague; I am new to cheating.

Thank you!
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ParkourPenguin
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PostPosted: Sun Jan 06, 2019 9:52 am    Post subject: Reply with quote
Look for a push or a mov that writes to rsp+30.
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daru
How do I cheat?
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PostPosted: Sun Jan 06, 2019 10:45 am    Post subject: Reply with quote
ParkourPenguin wrote:
Look for a push or a mov that writes to rsp+30.


Thank you for your reply. How come [rsp+30] matters when rsi is being set to rsp+30?
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ParkourPenguin
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PostPosted: Sun Jan 06, 2019 11:31 am    Post subject: Reply with quote
A write to rsp+30 (e.g. mov [rsp+30],5) will change the value read from rsi later on (e.g. mov eax,[rsi]).
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daru
How do I cheat?
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PostPosted: Mon Jan 07, 2019 1:48 am    Post subject: Reply with quote
ParkourPenguin wrote:
A write to rsp+30 (e.g. mov [rsp+30],5) will change the value read from rsi later on (e.g. mov eax,[rsi]).


Ah, I see what you mean now, thanks.
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