GCM commands

Is there documentation for the GCM functions or are you reverse engineering them? I'd like to get involved but I'm not sure where to start.

The official SDK has meticulous documentation on them but to obtain them legally you usually have to sign an NDA and a user agreement that precludes its use in the development, soooo.. reverse engineering is the only completely legal option.

Also, for discussing development matters using the IRC channel is usually faster, it's on efnet #rpcs3

Is there documentation for the GCM functions or are you reverse engineering them? I'd like to get involved but I'm not sure where to start.

try Devwiki PS3
or ask the devs where you could get the documentation (they probably have it)