Re: [PATCH -v4 9/9] tracing: add function graph tracer support forMIPS

[Nicholas Mc Guire]

> 
> 
> We're not doing back traces. We need to modify the return of the
> function being called. Note, the above functions that end with ";" are
> leaf functions. Non leaf functions show "{" and end with "}".
> 
> The trick here is to find a reliable way to modify the return address.
>
would it not more or less be the same thing if you used -finstrument-functions
then and provide a stub __cyg_profile_func_enter/exit initialized to an empty
function until you replace it during tracing. This does give you an overhead
when you are not tracing - but it would make the tracer implementation quite
generic.

hofrat 
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