Re: [PATCH v2 1/1] gdb: Preserve IFUNC marker when finding inferior functions

[Wilco Dijkstra <Wilco.Dijkstra@arm.com>]

Hi Muhammad,

> Yes.  GDB should prefer the cache/GOT path and avoid resolver calls
> where possible.  The patch does not make resolver calls safer or add a
> new resolver-calling mechanism; it just preserves the IFUNC marker so
> the existing IFUNC resolution path is used instead of calling the
> resolver address as though it were malloc itself.

Indeed - while the patch works for now as a workaround, directly calling
ifunc resolvers without following the ifunc ABI does not work. GDB only
passes HWCAP as the first argument, so the resolver may return different
functions due to the set of HWCAP values given not being identical between
GDB and GLIBC (ie. It could call the wrong malloc implementation that was
not selected or initialized).

So the best option is to call dlsym() as Florian suggested.

Cheers,
Wilco