ppc64 vDSO in mainline

[Steve Munroe]

Alan Modra <amodra@bigpond.net.au> wrote on 03/28/2005 06:46:12 PM:

> On Sat, Mar 26, 2005 at 10:13:58AM +1100, Benjamin Herrenschmidt wrote:
> [About function pointers]
> > But ppc64 will always load pointers from OPDs no ?
> 
> Yes.  This is why glibc/VDSO must provide relocated OPD entries if
> VDSO function symbols are to directly resolve references in a user app,
> ie. so that calls can be made without bouncing through some glibc stub
> code.  Calls via a function pointer don't go through the PLT.
> 

But inter-library bindings do (use the PLT) and this is what I am trying 
to enable. See powerpc64/dl-machine.h:elf_machine_fixup_plt to how we 
handle unrelocated .opd when resolving a PLT entry.

Steven J. Munroe
Linux on Power Toolchain Architect
IBM Corporation, Linux Technology Center