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Re: [PowerPC 64]r12 is not updated to GEP when control transferred from virtual thunk function .
On Mon, May 20, 2019 at 03:39:50AM -0500, Segher Boessenkool wrote:
> But it means it needs to make a stub for every global entry point that
> is used?
Mostly. Calls via function pointer don't (*), nor do you need stubs
when generating inline PLT calls. I'll note that use of the global
entry point for direct calls is closely associated with needing a PLT
entry, and the stubs we're talking about here are similar to the code
other architectures put in their .plt section.
*) The exception is when a non-PIC executable initialises a function
pointer in read-only memory to a function defined outside the
executable. This case requires a special stub in the executable to
serve as the address of the function.
--
Alan Modra
Australia Development Lab, IBM