fix ppc32 -msecure-plt TLS relaxation GD->LE

[Alexandre Oliva]

On Mar 14, 2006, Alan Modra <amodra@bigpond.net.au> wrote:

> On Fri, Mar 10, 2006 at 12:09:50AM -0300, Alexandre Oliva wrote:
>> Code compiled with -msecure-plt generates calls to __tls_get_addr with
>> a nonzero addend, that ends up making to the lower part of the TP
>> offset computed for the TL variable when Global Dynamic is relaxed to
>> Local Exec.  This patch fixes it, by arranging for us to refer to the
>> same location in both relocations.  We already did that for LD->LE,
>> but not GD->LE.  [LG[D->IE cancels out the second relocation, so its
>> addend doesn't matter, so I left it along even though it's still
>> conceptually wrong.
>> 
>> Tested on amd64-linux-gnu-x-ppc64-linux-gnu.  Ok to install?

> OK, thanks!  As you say, the GD->IE R_PPC_NONE addend doesn't matter,
> but I think it would be nicer to zero the addend.  Please make that
> change too.

Done, here's what I'm checking in.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Secretary for FSF Latin America        http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}