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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