On Sun, Nov 24, 2019 at 10:32:23AM -0600, Brandon Bergren wrote:
> On Sun, Nov 24, 2019, at 7:04 AM, Konstantin Belousov wrote:
> > On Sun, Nov 24, 2019 at 04:35:29AM +0000, Justin Hibbits wrote:
> > > Author: jhibbits
> > > Date: Sun Nov 24 04:35:29 2019
> > > New Revision: 355045
> > > URL: https://svnweb.freebsd.org/changeset/base/355045
> > >
> > > Log:
> > > rtld/powerpc: Fix _rtld_bind_start for powerpcspe
> > >
> > > Summary:
> > > We need to save off the full 64-bit register, not just the low 32 bits,
> > > of all registers getting saved off in _rtld_bind_start. Additionally,
> > > we need to save off the other SPE registers (SPEFSCR and accumulator),
> > > so that their program state is not affected by the PLT resolver.
> > Why do you need to save these registers ? Why would rtld touch them ?
> >
> Out of a need to make the binder as invisible as possible when interacting
> with code that may or may not be following the normal ABI rules regarding who
> is responsible for saving stuff.
>
> It's not just C code using it.
This was not the question. If a register is saved at the bind entry, it
means that it is used by rtld itself. I am surprised that rtld needs
anything from SPE.
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