Linux powerpc new system call instruction and ABI

Matheus Castanho msc at
Tue May 25 06:33:24 AEST 2021

Matheus Castanho <msc at> writes:

> Dmitry V. Levin <ldv at> writes:
>> On Fri, May 21, 2021 at 05:00:36PM -0300, Matheus Castanho wrote:
>>> Florian Weimer <fweimer at> writes:
>>> > * Matheus Castanho via Libc-alpha:
>>> >> From: Nicholas Piggin <npiggin at>
>>> >> 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>
>>> >
>>> > 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

Matheus Castanho

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