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Date: Wed, 19 May 2021 15:06:49 +0000
From: Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
To: "segher@...nel.crashing.org" <segher@...nel.crashing.org>,
"npiggin@...il.com" <npiggin@...il.com>
CC: "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
"ldv@...linux.org" <ldv@...linux.org>, "mpe@...erman.id.au"
<mpe@...erman.id.au>, "musl@...ts.openwall.com" <musl@...ts.openwall.com>,
"libc-dev@...ts.llvm.org" <libc-dev@...ts.llvm.org>,
"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: Linux powerpc new system call instruction and ABI
On Wed, 2021-05-19 at 09:38 -0500, Segher Boessenkool wrote:
> On Wed, May 19, 2021 at 06:42:40PM +1000, Nicholas Piggin wrote:
> > Excerpts from Joakim Tjernlund's message of May 19, 2021 6:08 pm:
> > > I always figured the ppc way was superior. It begs the question if not the other archs should
> > > change instead?
> >
> > It is superior in some ways, not enough to be worth being different.
>
> The PowerPC syscall ABI *requires* using cr0.3 for indicating errors,
> you will have to do that whether you conflate the concepts of return
> code and error indicator or not!
>
> > Other archs are unlikely to change because it would be painful for
> > not much benefit.
>
> Other archs cannot easily change for much the same reason :-)
Really? I figured you could just add extra error indication in kernel syscall I/F.
Eventually user space could migrate to the new indication.
Jocke
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