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Re: dynamic PIC register?

To: Alexandre Oliva <aoliva at redhat dot com>
Subject: Re: dynamic PIC register?
From: Stan Shebs <shebs at apple dot com>
Date: Thu, 27 Sep 2001 06:37:21 -0700
CC: dalej at apple dot com, gcc at gcc dot gnu dot org
References: <200109210020.f8L0KPR22843@scv2.apple.com> <orbsjxypjx.fsf@localhost.localdomain>

Alexandre Oliva wrote:
> 
> On Sep 20, 2001, dalej@apple.com wrote:
> 
> > On the Darwin powerpc target, it would be better not to have
> > PIC_OFFSET_TABLE_REGNUM be a fixed register.
> 
> I don't know anything about the implementation of shared libraries on
> ppc, but if it uses a procedure linkage table, I don't see how the PIC
> register may vary: the PLT in general depends on a specific register
> pointing to the GOT (plus or minus some constant).

No PLT or GOT.  The PIC register is set up per-function.  The Darwin
PIC strategy is unlike any other, one reason why there is a lot of code
in config/darwin.*.

Stan

References:
- dynamic PIC register?
  - From: dalej
- Re: dynamic PIC register?
  - From: Alexandre Oliva

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