[dev] Guessing structures from memory addresses

[Alex]

Here's a short tutorial which shows how to identify the structure
where a given memory address belongs to.
http://magiclantern.wikia.com/wiki/Struct_Guessing

This is helpful in finding the code which references addresses found
with mem-spy
http://magiclantern.wikia.com/wiki/Memory_Addresses

As an example, I've explained how to apply this in finding
FOCUS_CONFIRMATION (used for Trap Focus) on 60D, 600D and 50D,
starting from the address discovered with mem-spy on 550D.

The tutorial is a bit rough, and improvements are welcome. It is
inspired a bit from Arm.Indy's latest work in getting VRAM addresses
from code. I have tried to do the same thing for HD buffers, without
success yet.

[Vincent Olivier]

Hi Alex,

Using the alpha codebase and building it for 600D, don't see anything in the logs (when pressing [Q]) with the Debug/"Spy…" option on. What am I supposed to look for? Is it supposed to have the [MAGIC] prefix?

And then, I look this up in the ARM console?

And then, try to fin out the structures?

Are there specific structures/addresses you KNOW need to be ported for 600D?

Vincent

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[Andrew Coutts]

I think it's more for understanding how the camera works :)

I'm not sure if it's done yet on the 600D, but I had to fix the
mvr_config struct for the 500d and it was quite "fun" :P