SFrame stack tracer

[Claudiu Zissulescu-Ianculescu]

Hi Florian,

I am comming back to you for clarifying some aspects of SFrame stack
tracer support in glibc.
Looking to dwarf stack unwinding support in glibc, it looks to me like
it is based on unwinder routines from libgcc.
Now, I would like to clarify if you would like to see the entire SFrame
stack tracer implementation added to glibc source code, i.e., without
any libgcc callbacks like in dwarf case.
As far as I can see, a SFrame stack tracer implementation will need some
architecture specific code added too, which may imply some extra
interfaces to be created on top of the suggested one in dl_find_object
structure.

Looking forward for your reaction, and thank you,
Claudiu