commit ebef121c1f5cd813489c823c81834f83e7f5fb4e
author Jerome Forissier <jerome.forissier@linaro.org> Thu Aug 01 18:08:24 2019 +0200
committer Jérôme Forissier <jerome.forissier@linaro.org> Fri Aug 23 18:47:16 2019 +0200
tree 031bfc745d3dec8315fdb49ef2549e44d829ebe8
parent 791ee55c91758bc4e1379755024af64bc1a53189

core, ldelf: add support for runtime loading of shared libraries

This commit prepares the introduction of libdl, a dynamic linking
library which will allow TAs to load shared libraries at run time,
and resolve symbols on demand. It adds the following function to the
system PTA, inspired from the POSIX dlopen() and dlsym():

 - system_dlopen(): takes a UUID and flags. Performs an upcall into
ldelf which then uses the usual system PTA functions to load an map the
requested library into the address space of the calling TA.
 - system_dlsym(): takes a UUID and a symbol name. The symbol is
looked up in the library specified by UUID by calling into ldelf. If
UUID is all zeros, all the mapped binaries are searched.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>