llvm dev - Jan 2016 - Memory access with machine function pass

hey there,


could somebody tell me if there is any possibility to write/read from 
memory with a machine function pass right behind the pro- / epilogue 
emission?

I'm trying to create a section with static size (similar to bss) and 
then store / write values with modified pro-/ and epilogues.

I think a Machine Function Pass would be the right way ?!?!


Thanks a lot

greetings sebastian