Linux powerpc new system call instruction and ABI

[Matheus Castanho]

Matheus Castanho <msc at linux.ibm.com> writes:

> Dmitry V. Levin <ldv at altlinux.org> writes:
>
>> On Fri, May 21, 2021 at 05:00:36PM -0300, Matheus Castanho wrote:
>>> Florian Weimer <fweimer at redhat.com> writes:
>>> > * Matheus Castanho via Libc-alpha:
>>> >> From: Nicholas Piggin <npiggin at gmail.com>
>>> >> 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 according to the ABI.
>>> >>
>>> >> Reviewed-by: Matheus Castanho <msc at linux.ibm.com>
>>> >
>>> > Please reference bug 27892 in the commit message.  I'd also appreciate a
>>> > backport to the 2.33 release branch (where you need to add NEWS manually
>>> > to add the bug reference).
>>>
>>> No problem. [BZ #27892] appended to the commit title. I'll make sure to
>>> backport to 2.33 as well.
>>
>> Could you also mention in the commit message that the change fixes
>> 'signal.gen.test' strace test where it was observed initially?
>
> Sure, no problem. I'll commit it later today.

Since the patch falls into the less-than-15-LOC category and this is
Nick's first contribution to glibc, looks like he doesn't need a
copyright assignment.

Pushed to master as 7de36744ee1325f35d3fe0ca079dd33c40b12267

Backported to 2.33 via commit 0ef0e6de7fdfa18328b09ba2afb4f0112d4bdab4

Thanks,
Matheus Castanho