linux-kernel - Re: [PATCH 5/8] s390/purgatory: workaround llvm's IAS limitations

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Date:   Thu, 12 May 2022 19:26:39 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Jonas Paulsson <paulsson@...ux.vnet.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Ulrich Weigand <ulrich.weigand@...ibm.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Andreas Krebbel <krebbel@...ux.ibm.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH 5/8] s390/purgatory: workaround llvm's IAS limitations

On Wed, May 11, 2022 at 12:54:41PM -0700, Nick Desaulniers wrote:
> On Wed, May 11, 2022 at 5:05 AM Heiko Carstens <hca@...ux.ibm.com> wrote:
> >
> > llvm's integrated assembler cannot handle immediate values which are
> > calculated with two local labels:
> >
> > arch/s390/purgatory/head.S:139:11: error: invalid operand for instruction
> >  aghi %r8,-(.base_crash-purgatory_start)
> 
> I thought this was fixed in
> https://github.com/ClangBuiltLinux/linux/issues/1420
> https://reviews.llvm.org/D113341
> (clang-14)
> ?

Looks like the referenced fix only works for displacements, bit not
for immediates.