Matheus Castanho writes:
> Dmitry V. Levin writes:
>
>> On Fri, May 21, 2021 at 05:00:36PM -0300, Matheus Castanho wrote:
>>> Florian Weimer writes:
>>> > * Matheus Castanho via Libc-alpha:
>>> >> From: Nicholas Piggin
>>> >> Subject: [PATCH 1/1] powerpc: Fix handling of scv return error cod
Dmitry V. Levin writes:
> On Fri, May 21, 2021 at 05:00:36PM -0300, Matheus Castanho wrote:
>> Florian Weimer writes:
>> > * Matheus Castanho via Libc-alpha:
>> >> From: Nicholas Piggin
>> >> Subject: [PATCH 1/1] powerpc: Fix handling of scv return error codes
>> >>
>> >> When using scv on te
On Fri, May 21, 2021 at 05:00:36PM -0300, Matheus Castanho wrote:
> Florian Weimer writes:
> > * Matheus Castanho via Libc-alpha:
> >> From: Nicholas Piggin
> >> Subject: [PATCH 1/1] powerpc: Fix handling of scv return error codes
> >>
> >> When using scv on templated ASM syscalls, current code i
Florian Weimer writes:
> * Matheus Castanho via Libc-alpha:
>
>> From: Nicholas Piggin
>> Subject: [PATCH 1/1] powerpc: Fix handling of scv return error codes
>>
>> When using scv on templated ASM syscalls, current code interprets any
>> negative return value as error, but the only valid error
* Matheus Castanho via Libc-alpha:
> From: Nicholas Piggin
> Subject: [PATCH 1/1] powerpc: Fix handling of scv return error codes
>
> When using scv on templated ASM syscalls, current code interprets any
> negative return value as error, but the only valid error codes are in
> the range -4095..-1
Nicholas Piggin writes:
> Excerpts from Nicholas Piggin's message of May 19, 2021 12:50 pm:
>> Excerpts from Dmitry V. Levin's message of May 19, 2021 9:13 am:
>>> Hi,
>>>
>>> On Thu, Jun 11, 2020 at 06:12:01PM +1000, Nicholas Piggin wrote:
>>> [...]
- Error handling: The consensus among k
Excerpts from Dmitry V. Levin's message of May 20, 2021 12:59 pm:
> On Thu, May 20, 2021 at 12:45:57PM +1000, Nicholas Piggin wrote:
>> Excerpts from Dmitry V. Levin's message of May 20, 2021 11:06 am:
>> > On Wed, May 19, 2021 at 07:48:47PM -0400, Rich Felker wrote:
>> >> On Wed, May 19, 2021 at 0
Excerpts from Dmitry V. Levin's message of May 20, 2021 1:06 pm:
> On Thu, May 20, 2021 at 12:40:36PM +1000, Nicholas Piggin wrote:
> [...]
>> > Looks like struct pt_regs.trap already contains the information that could
>> > be used to tell 'sc' from 'scv': if (pt_regs.trap & ~0xf) == 0x3000, then
On Thu, May 20, 2021 at 12:40:36PM +1000, Nicholas Piggin wrote:
[...]
> > Looks like struct pt_regs.trap already contains the information that could
> > be used to tell 'sc' from 'scv': if (pt_regs.trap & ~0xf) == 0x3000, then
> > it's scv. Is my reading of arch/powerpc/include/asm/ptrace.h corre
On Thu, May 20, 2021 at 12:45:57PM +1000, Nicholas Piggin wrote:
> Excerpts from Dmitry V. Levin's message of May 20, 2021 11:06 am:
> > On Wed, May 19, 2021 at 07:48:47PM -0400, Rich Felker wrote:
> >> On Wed, May 19, 2021 at 06:09:25PM +, Joakim Tjernlund wrote:
> > [...]
> >> > W.r.t breakin
Excerpts from Dmitry V. Levin's message of May 20, 2021 11:06 am:
> On Wed, May 19, 2021 at 07:48:47PM -0400, Rich Felker wrote:
>> On Wed, May 19, 2021 at 06:09:25PM +, Joakim Tjernlund wrote:
> [...]
>> > W.r.t breaking ABI, isn't that what PowerPC is trying to do with the new
>> > syscall I
Excerpts from Dmitry V. Levin's message of May 20, 2021 9:27 am:
> On Thu, May 20, 2021 at 08:51:53AM +1000, Nicholas Piggin wrote:
>> Excerpts from Dmitry V. Levin's message of May 19, 2021 11:26 pm:
>> > On Wed, May 19, 2021 at 08:59:05PM +1000, Nicholas Piggin wrote:
>> >> Excerpts from Dmitry V
On Wed, May 19, 2021 at 07:48:47PM -0400, Rich Felker wrote:
> On Wed, May 19, 2021 at 06:09:25PM +, Joakim Tjernlund wrote:
[...]
> > W.r.t breaking ABI, isn't that what PowerPC is trying to do with the new
> > syscall I/F?
>
> No, it's a new independent interface.
Unfortunately, being a n
On Wed, May 19, 2021 at 06:09:25PM +, Joakim Tjernlund wrote:
> On Wed, 2021-05-19 at 10:22 -0500, Segher Boessenkool wrote:
> > On Wed, May 19, 2021 at 03:06:49PM +, Joakim Tjernlund wrote:
> > > On Wed, 2021-05-19 at 09:38 -0500, Segher Boessenkool wrote:
> > > > On Wed, May 19, 2021 at 0
On Thu, May 20, 2021 at 08:51:53AM +1000, Nicholas Piggin wrote:
> Excerpts from Dmitry V. Levin's message of May 19, 2021 11:26 pm:
> > On Wed, May 19, 2021 at 08:59:05PM +1000, Nicholas Piggin wrote:
> >> Excerpts from Dmitry V. Levin's message of May 19, 2021 8:24 pm:
> >> > On Wed, May 19, 2021
Excerpts from Dmitry V. Levin's message of May 19, 2021 11:26 pm:
> On Wed, May 19, 2021 at 08:59:05PM +1000, Nicholas Piggin wrote:
>> Excerpts from Dmitry V. Levin's message of May 19, 2021 8:24 pm:
>> > On Wed, May 19, 2021 at 12:50:24PM +1000, Nicholas Piggin wrote:
>> > [...]
>> >> With this p
On Wed, 2021-05-19 at 10:22 -0500, Segher Boessenkool wrote:
> On Wed, May 19, 2021 at 03:06:49PM +, Joakim Tjernlund wrote:
> > 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 Tjern
On Wed, May 19, 2021 at 10:22:05AM -0500, Segher Boessenkool wrote:
> On Wed, May 19, 2021 at 03:06:49PM +, Joakim Tjernlund wrote:
> > 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 Joaki
On Wed, May 19, 2021 at 03:06:49PM +, Joakim Tjernlund wrote:
> 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
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 s
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 enoug
On Wed, May 19, 2021 at 08:59:05PM +1000, Nicholas Piggin wrote:
> Excerpts from Dmitry V. Levin's message of May 19, 2021 8:24 pm:
> > On Wed, May 19, 2021 at 12:50:24PM +1000, Nicholas Piggin wrote:
> > [...]
> >> With this patch, I think the ptrace ABI should mostly be fixed. I think
> >> a pro
Nicholas Piggin via Libc-alpha writes:
> As a more hacky thing you could make a syscall with -1 and see how
> the error looks, and then assume all syscalls will be the same.
I'm not sure this would work.
Even in glibc, it's expected that early syscalls will use sc while scv is used
later in the
Excerpts from Nicholas Piggin's message of May 19, 2021 6:42 pm:
> Excerpts from Joakim Tjernlund's message of May 19, 2021 6:08 pm:
>> On Wed, 2021-05-19 at 17:55 +1000, Nicholas Piggin wrote:
>>> Excerpts from Joakim Tjernlund's message of May 19, 2021 5:33 pm:
>>> > On Wed, 2021-05-19 at 02:13 +
Excerpts from Dmitry V. Levin's message of May 19, 2021 8:24 pm:
> On Wed, May 19, 2021 at 12:50:24PM +1000, Nicholas Piggin wrote:
> [...]
>> With this patch, I think the ptrace ABI should mostly be fixed. I think
>> a problem remains with applications that look at system call return
>> register
On Wed, May 19, 2021 at 12:50:24PM +1000, Nicholas Piggin wrote:
[...]
> With this patch, I think the ptrace ABI should mostly be fixed. I think
> a problem remains with applications that look at system call return
> registers directly and have powerpc specific error cases. Those probably
> will
Excerpts from Joakim Tjernlund's message of May 19, 2021 6:08 pm:
> On Wed, 2021-05-19 at 17:55 +1000, Nicholas Piggin wrote:
>> 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,
On Wed, 2021-05-19 at 17:55 +1000, Nicholas Piggin wrote:
> 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:
> > > [...]
> > > > - E
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
>> >
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
>
Excerpts from Nicholas Piggin's message of May 19, 2021 12:50 pm:
> Excerpts from Dmitry V. Levin's message of May 19, 2021 9:13 am:
>> 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 t
Excerpts from Dmitry V. Levin's message of May 19, 2021 9:13 am:
> 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 indica
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 fu
Excerpts from Segher Boessenkool's message of June 12, 2020 7:02 am:
> Hi!
>
> On Thu, Jun 11, 2020 at 06:12:01PM +1000, Nicholas Piggin wrote:
>> Calling convention
>> --
>> The proposal is for scv 0 to provide the standard Linux system call ABI
>> with the following differences
Hi!
On Thu, Jun 11, 2020 at 06:12:01PM +1000, Nicholas Piggin wrote:
> Calling convention
> --
> The proposal is for scv 0 to provide the standard Linux system call ABI
> with the following differences from sc convention[1]:
>
> - lr is to be volatile across scv calls. This is ne
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