linux-kernel - Re: [PATCH v5] x86/crypto: aesni: Fix build with LLVM

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Date:   Thu, 9 Jul 2020 22:55:36 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Craig Topper <craig.topper@...el.com>,
        Craig Topper <craig.topper@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v5] x86/crypto: aesni: Fix build with LLVM_IAS=1

On Fri, Jul 03, 2020 at 04:32:06PM +0200, Sedat Dilek wrote:
> When building with LLVM_IAS=1 means using Clang's Integrated Assembly (IAS)
> from LLVM/Clang >= v10.0.1-rc1+ instead of GNU/as from GNU/binutils
> I see the following breakage in Debian/testing AMD64:
> 
> <instantiation>:15:74: error: too many positional arguments
>  PRECOMPUTE 8*3+8(%rsp), %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7,
>                                                                          ^
>  arch/x86/crypto/aesni-intel_asm.S:1598:2: note: while in macro instantiation
>  GCM_INIT %r9, 8*3 +8(%rsp), 8*3 +16(%rsp), 8*3 +24(%rsp)
>  ^
> <instantiation>:47:2: error: unknown use of instruction mnemonic without a size suffix
>  GHASH_4_ENCRYPT_4_PARALLEL_dec %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, %xmm14, %xmm0, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7, %xmm8, enc
>  ^
> arch/x86/crypto/aesni-intel_asm.S:1599:2: note: while in macro instantiation
>  GCM_ENC_DEC dec
>  ^
> <instantiation>:15:74: error: too many positional arguments
>  PRECOMPUTE 8*3+8(%rsp), %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7,
>                                                                          ^
> arch/x86/crypto/aesni-intel_asm.S:1686:2: note: while in macro instantiation
>  GCM_INIT %r9, 8*3 +8(%rsp), 8*3 +16(%rsp), 8*3 +24(%rsp)
>  ^
> <instantiation>:47:2: error: unknown use of instruction mnemonic without a size suffix
>  GHASH_4_ENCRYPT_4_PARALLEL_enc %xmm9, %xmm10, %xmm11, %xmm12, %xmm13, %xmm14, %xmm0, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7, %xmm8, enc
>  ^
> arch/x86/crypto/aesni-intel_asm.S:1687:2: note: while in macro instantiation
>  GCM_ENC_DEC enc
> 
> Craig Topper suggested me in ClangBuiltLinux issue #1050:
> 
> > I think the "too many positional arguments" is because the parser isn't able
> > to handle the trailing commas.
> >
> > The "unknown use of instruction mnemonic" is because the macro was named
> > GHASH_4_ENCRYPT_4_PARALLEL_DEC but its being instantiated with
> > GHASH_4_ENCRYPT_4_PARALLEL_dec I guess gas ignores case on the
> > macro instantiation, but llvm doesn't.
> 
> First, I removed the trailing comma in the PRECOMPUTE line.
> 
> Second, I substituted:
> 1. GHASH_4_ENCRYPT_4_PARALLEL_DEC -> GHASH_4_ENCRYPT_4_PARALLEL_dec
> 2. GHASH_4_ENCRYPT_4_PARALLEL_ENC -> GHASH_4_ENCRYPT_4_PARALLEL_enc
> 
> With these changes I was able to build with LLVM_IAS=1 and boot on bare metal.
> 
> I confirmed that this works with Linux-kernel v5.7.5 final.
> 
> NOTE: This patch is on top of Linux v5.7 final.
> 
> Thanks to Craig and especially Nick for double-checking and his comments.
> 
> Suggested-by: Craig Topper <craig.topper@...el.com>
> Suggested-by: Craig Topper <craig.topper@...il.com>
> Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: "ClangBuiltLinux" <clang-built-linux@...glegroups.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1050
> Link: https://bugs.llvm.org/show_bug.cgi?id=24494
> Signed-off-by: Sedat Dilek <sedat.dilek@...il.com>
> ---
> Changes v4->v5:
> - Drop "5.7" tag from subject line as requested by Herbert Xu
> - Add Link to LLVM bug #24494 (thanks Nick)
> 
> Changes v3->v4:
> - Add <> around email address as desired by Nick
> - Add Nick's Reviewed-by
> 
> Changes v2->v3:
> - Add this Changelog
> 
> Changes v1->v2:
> - Replace Cc by Suggested-by for Craig
> - Replace Cc by Suggested-by for Nick (dropped Cc as desired)
> - Really follow the suggestions of Craig
> - Drop unneeded comments for my build-environment and Links
> 
>  arch/x86/crypto/aesni-intel_asm.S | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt