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From: Nicholas Piggin <npiggin@gmail.com>
To: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>,
	"ldv@altlinux.org" <ldv@altlinux.org>,
	"mpe@ellerman.id.au" <mpe@ellerman.id.au>
Cc: "libc-dev@lists.llvm.org" <libc-dev@lists.llvm.org>,
	"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"musl@lists.openwall.com" <musl@lists.openwall.com>
Subject: [musl] Re: Linux powerpc new system call instruction and ABI
Date: Wed, 19 May 2021 17:55:35 +1000	[thread overview]
Message-ID: <1621410291.c7si38sa9q.astroid@bobo.none> (raw)
In-Reply-To: <9b5ea7059c5a5d4e9ccccd7d73ce2c66b2203f52.camel@infinera.com>

Excerpts from Joakim Tjernlund's message of May 19, 2021 5:33 pm:
> On Wed, 2021-05-19 at 02:13 +0300, Dmitry V. Levin wrote:
>> Hi,
>> 
>> On Thu, Jun 11, 2020 at 06:12:01PM +1000, Nicholas Piggin wrote:
>> [...]
>> > - Error handling: The consensus among kernel, glibc, and musl is to move to
>> >   using negative return values in r3 rather than CR0[SO]=1 to indicate error,
>> >   which matches most other architectures, and is closer to a function call.
> 
> What about syscalls like times(2) which can return -1 without it being an error?

They do become errors / indistinguishable and have to be dealt with by 
libc or userspace. Which does follow what most architectures do (all 
except ia64, mips, sparc, and powerpc actually).

Interesting question though, it should have been noted.

Thanks,
Nick

  reply	other threads:[~2021-05-19  7:55 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-11  8:12 [musl] " Nicholas Piggin
2020-06-11  8:12 ` [musl] [PATCH 1/2] powerpc/64s/exception: treat NIA below __end_interrupts as soft-masked Nicholas Piggin
2020-07-24 13:25   ` [musl] " Michael Ellerman
2020-06-11  8:12 ` [musl] [PATCH 2/2] powerpc/64s: system call support for scv/rfscv instructions Nicholas Piggin
2020-07-23  6:47   ` [musl] " Michael Ellerman
2020-07-23 16:48     ` Christophe Leroy
2020-07-24 10:45       ` Michael Ellerman
2020-06-11 21:02 ` [musl] Re: Linux powerpc new system call instruction and ABI Segher Boessenkool
2020-06-14  9:26   ` Nicholas Piggin
2021-05-18 23:13 ` Dmitry V. Levin
2021-05-19  2:50   ` Nicholas Piggin
2021-05-19  5:01     ` Nicholas Piggin
2021-05-21 19:40       ` Matheus Castanho
2021-05-21 19:52         ` Florian Weimer
2021-05-21 20:00           ` Matheus Castanho
2021-05-21 20:52             ` Dmitry V. Levin
2021-05-24 12:11               ` Matheus Castanho
2021-05-24 20:33                 ` Matheus Castanho
2021-05-19 10:24     ` Dmitry V. Levin
2021-05-19 10:59       ` Nicholas Piggin
2021-05-19 12:39         ` Tulio Magno Quites Machado Filho
2021-05-19 13:26         ` Dmitry V. Levin
2021-05-19 22:51           ` Nicholas Piggin
2021-05-19 23:27             ` Dmitry V. Levin
2021-05-20  2:40               ` Nicholas Piggin
2021-05-20  3:06                 ` Dmitry V. Levin
2021-05-20  5:12                   ` Nicholas Piggin
2021-05-19  7:33   ` Joakim Tjernlund
2021-05-19  7:55     ` Nicholas Piggin [this message]
2021-05-19  8:08       ` Joakim Tjernlund
2021-05-19  8:42         ` Nicholas Piggin
2021-05-19 11:12           ` Nicholas Piggin
2021-05-19 14:38           ` Segher Boessenkool
2021-05-19 15:06             ` Joakim Tjernlund
2021-05-19 15:22               ` Segher Boessenkool
2021-05-19 15:36                 ` Rich Felker
2021-05-19 18:09                 ` Joakim Tjernlund
2021-05-19 23:48                   ` Rich Felker
2021-05-20  1:06                     ` Dmitry V. Levin
2021-05-20  2:45                       ` Nicholas Piggin
2021-05-20  2:59                         ` Dmitry V. Levin
2021-05-20  7:20                           ` Nicholas Piggin

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