musl - Re: Re: ppc64le and 32-bit LE userland compatibility

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Message-ID: <CAGWvnymiNUWSMeGNDvJk_uc=8OdS1Y_8uE=cd0s2BKCFFe7Dkg@mail.gmail.com>
Date: Thu, 4 Jun 2020 15:00:51 -0400
From: David Edelsohn <dje.gcc@...il.com>
To: musl@...ts.openwall.com
Cc: Segher Boessenkool <segher@...nel.crashing.org>, Daniel Kolesa <daniel@...aforge.org>, 
	Michal Suchánek <msuchanek@...e.de>, 
	Joseph Myers <joseph@...esourcery.com>, GNU C Library <libc-alpha@...rceware.org>, eery@...erfox.es, 
	Will Springer <skirmisher@...tonmail.com>, 
	Palmer Dabbelt via binutils <binutils@...rceware.org>, via libc-dev <libc-dev@...ts.llvm.org>, 
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: Re: ppc64le and 32-bit LE userland compatibility

On Thu, Jun 4, 2020 at 1:46 PM Rich Felker <dalias@...c.org> wrote:
>
> On Thu, Jun 04, 2020 at 12:33:12PM -0500, Segher Boessenkool wrote:
> > On Thu, Jun 04, 2020 at 01:18:44PM -0400, Rich Felker wrote:
> > > On Thu, Jun 04, 2020 at 12:12:32PM -0500, Segher Boessenkool wrote:
> > > > On Tue, Jun 02, 2020 at 05:13:25PM +0200, Daniel Kolesa wrote:
> > > > > well, ppc64le already cannot be run on those, as far as I know (I
> > > > > don't think it's possible to build ppc64le userland without VSX in
> > > > > any configuration)
> > > >
> > > > VSX is required by the ELFv2 ABI:
> > > >
> > > > """
> > > > Specifically, to use this ABI and ABI-compliant programs, OpenPOWER-
> > > > compliant processors must implement the following categories:
> > >
> > > This is not actually ABI but IBM policy laundered into an ABI
> > > document, which musl does not honor.
> >
> > It is the ABI.  If you think it should be different, make your own ABI,
> > don't pretend the existing ABI is different than what it is.  Thank you.
>
> Our ABI is as specified in the ELFv2 document, but with ld as ld64,
> and minus gratuitous requirements on ISA level that are not part of
> implementing linkage.

Rich,

If you are changing the Power ELFv2 ABI then it is not the Power ELFv2
ABI.  You can't cherry-pick what you like and claim that it is
compatible.  You are not conforming to the ABI.

Thanks, David

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