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Date: Wed, 22 Apr 2020 22:36:42 -0400
From: Rich Felker <dalias@...c.org>
To: Nicholas Piggin <npiggin@...il.com>
Cc: Adhemerval Zanella <adhemerval.zanella@...aro.org>,
libc-alpha@...rceware.org, libc-dev@...ts.llvm.org,
linuxppc-dev@...ts.ozlabs.org, musl@...ts.openwall.com
Subject: Re: Powerpc Linux 'scv' system call ABI proposal take 2
On Wed, Apr 22, 2020 at 04:18:36PM +1000, Nicholas Piggin wrote:
> Yeah I had a bit of a play around with musl (which is very nice code I
> must say). The powerpc64 syscall asm is missing ctr clobber by the way.
> Fortunately adding it doesn't change code generation for me, but it
> should be fixed. glibc had the same bug at one point I think (probably
> due to syscall ABI documentation not existing -- something now lives in
> linux/Documentation/powerpc/syscall64-abi.rst).
Do you know anywhere I can read about the ctr issue, possibly the
relevant glibc bug report? I'm not particularly familiar with ppc
register file (at least I have to refamiliarize myself every time I
work on this stuff) so it'd be nice to understand what's
potentially-wrong now.
Rich
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