On Thu, 21 Jan 2016, Torsten Duwe wrote:

quoted

mcount call sites looks normal on first sight...

Not quite.
LR is not saved on the stack before the call.
Argh!

Petr, this looks like 12 bytes offset for gcc-6.
I think I can work around the rest.

Are we sure that gcc is doing the right thing here?

I am far from claiming understanding of ppc64 ABI, but from what Vojtech 
told me I understood that saving link register is necessary for (at least) 
graph tracer to work properly.

Thanks,

-- 
Jiri Kosina
SUSE Labs