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Storing the addresses that an instruction writes to.

 
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Tatsu808
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Joined: 15 Nov 2014
Posts: 20
PostPosted: Mon Feb 01, 2016 10:11 pm    Post subject: Storing the addresses that an instruction writes to. Reply with quote
Hi, in Fallout 4, I found an instruction which writes to all enemy Y coordinates. It is below:

Code:
movaps [rdi],xmm0


I believe that in the instruction above, xmm0 is a float value representing the enemy Y coordinate, and it is storing it in address [rdi]. I want to be able to capture each enemies' Y-coordinate on the map, so I did the following:

Code:

push eax
mov eax, [rdi]
mov [storage], eax
pop eax
movaps [rdi],xmm0


From the above, I thought that [storage] would contain rapidly changing values representing addresses of the enemy-y coordinates, however, this is not the case.... How do I capture all enemy-y coordinates from the instruction above without using "Find out what addresses this instruction accesses"?

rdiValue.png
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rdiValue.png


Last edited by Tatsu808 on Mon Feb 01, 2016 10:46 pm; edited 1 time in total
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Zanzer
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Joined: 09 Jun 2013
Posts: 3278
PostPosted: Mon Feb 01, 2016 10:14 pm    Post subject: Reply with quote
Code:
mov [storage],rdi
movaps [rdi],xmm0
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Tatsu808
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Joined: 15 Nov 2014
Posts: 20
PostPosted: Mon Feb 01, 2016 10:27 pm    Post subject: Reply with quote
Thanks for the reply. Edit: I was being dumb. My [storage] does contain the addresses of the enemy y-coordinates afterall. Thanks!! +Repped.
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