lkml.org 
[lkml]   [2020]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
SubjectRe: [PATCH 5.7 v2] x86/crypto: aesni: Fix build with LLVM_IAS=1
On Mon, Jun 22, 2020 at 7:56 PM Sedat Dilek <sedat.dilek@gmail.com> 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 for the note, still applies cleanly on top of linux-next today for me.

>
> Thanks to Craig and especially Nick for double-checking and his comments.
>
> Suggested-by: Craig Topper <craig.topper@intel.com>
> Suggested-by: Craig Topper <craig.topper@gmail.com>
> Suggested-by: Nick Desaulniers ndesaulniers@google.com

^ oh, may have missed <> around email addr.

> Cc: "ClangBuiltLinux" <clang-built-linux@googlegroups.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1050
> Signed-off-by: Sedat Dilek <sedat.dilek@gmail.com>

Following the same testing methodology from V1
(https://lore.kernel.org/patchwork/comment/1456822/) I verified for
GCC+GAS this is no functional change.

$ wget https://lore.kernel.org/patchwork/patch/1261340/mbox/ -O sedat_v3.patch
$ git am sedat_v3.patch
$ make -j71 arch/x86/crypto/aesni-intel_asm.o
$ llvm-objdump -dr arch/x86/crypto/aesni-intel_asm.o > postpatch_v3.txt
$ diff -u <(cat prepatch.txt | tr -s ' ' | cut -d ' ' -f 2-) <(cat
postpatch_v3.txt| tr -s ' ' | cut -d ' ' -f 2-) | less
(no output)

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

> ---
> arch/x86/crypto/aesni-intel_asm.S | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S
> index cad6e1bfa7d5..c216de287742 100644
> --- a/arch/x86/crypto/aesni-intel_asm.S
> +++ b/arch/x86/crypto/aesni-intel_asm.S
> @@ -266,7 +266,7 @@ ALL_F: .octa 0xffffffffffffffffffffffffffffffff
> PSHUFB_XMM %xmm2, %xmm0
> movdqu %xmm0, CurCount(%arg2) # ctx_data.current_counter = iv
>
> - PRECOMPUTE \SUBKEY, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7,
> + PRECOMPUTE \SUBKEY, %xmm1, %xmm2, %xmm3, %xmm4, %xmm5, %xmm6, %xmm7
> movdqu HashKey(%arg2), %xmm13
>
> CALC_AAD_HASH %xmm13, \AAD, \AADLEN, %xmm0, %xmm1, %xmm2, %xmm3, \
> @@ -978,7 +978,7 @@ _initial_blocks_done\@:
> * arg1, %arg3, %arg4 are used as pointers only, not modified
> * %r11 is the data offset value
> */
> -.macro GHASH_4_ENCRYPT_4_PARALLEL_ENC TMP1 TMP2 TMP3 TMP4 TMP5 \
> +.macro GHASH_4_ENCRYPT_4_PARALLEL_enc TMP1 TMP2 TMP3 TMP4 TMP5 \
> TMP6 XMM0 XMM1 XMM2 XMM3 XMM4 XMM5 XMM6 XMM7 XMM8 operation
>
> movdqa \XMM1, \XMM5
> @@ -1186,7 +1186,7 @@ aes_loop_par_enc_done\@:
> * arg1, %arg3, %arg4 are used as pointers only, not modified
> * %r11 is the data offset value
> */
> -.macro GHASH_4_ENCRYPT_4_PARALLEL_DEC TMP1 TMP2 TMP3 TMP4 TMP5 \
> +.macro GHASH_4_ENCRYPT_4_PARALLEL_dec TMP1 TMP2 TMP3 TMP4 TMP5 \
> TMP6 XMM0 XMM1 XMM2 XMM3 XMM4 XMM5 XMM6 XMM7 XMM8 operation
>
> movdqa \XMM1, \XMM5
> --

--
Thanks,
~Nick Desaulniers

\
 
 \ /
  Last update: 2020-06-23 20:45    [W:0.051 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site