From: Nick Desaulniers <ndesaulniers@google.com>
To: Stefan Agner <stefan@agner.ch>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
Russell King <linux@armlinux.org.uk>,
Manoj Gupta <manojgupta@google.com>,
Jian Cai <jiancai@google.com>,
"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Ard.Biesheuvel@arm.com
Subject: Re: [PATCH] crypto: arm/ghash-ce - define fpu before fpu registers are referenced
Date: Tue, 3 Mar 2020 14:20:03 -0800 [thread overview]
Message-ID: <CAKwvOdmvOq9X3zR17TsEZpJ83BYC1vX=pYMPyZ6Db3xeHUxzag@mail.gmail.com> (raw)
In-Reply-To: <c41cc67321d0b366e356440e6dbc9eceb1babfe4.1583105749.git.stefan@agner.ch>
On Sun, Mar 1, 2020 at 3:37 PM Stefan Agner <stefan@agner.ch> wrote:
>
> Building ARMv7 with Clang's integrated assembler leads to errors such
> as:
> arch/arm/crypto/ghash-ce-core.S:34:11: error: register name expected
> t3l .req d16
> ^
>
> Since no FPU has selected yet Clang considers d16 not a valid register.
> Moving the FPU directive on-top allows Clang to parse the registers and
> allows to successfully build this file with Clang's integrated assembler.
Certainly a side effect of having a single pass assembler...This does
fix what otherwise looks like a slew of errors for us, thanks for the
patch.
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
>
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> ---
> arch/arm/crypto/ghash-ce-core.S | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/crypto/ghash-ce-core.S b/arch/arm/crypto/ghash-ce-core.S
> index 534c9647726d..9f51e3fa4526 100644
> --- a/arch/arm/crypto/ghash-ce-core.S
> +++ b/arch/arm/crypto/ghash-ce-core.S
> @@ -8,6 +8,9 @@
> #include <linux/linkage.h>
> #include <asm/assembler.h>
>
> + .arch armv8-a
> + .fpu crypto-neon-fp-armv8
> +
> SHASH .req q0
> T1 .req q1
> XL .req q2
> @@ -88,8 +91,6 @@
> T3_H .req d17
>
> .text
> - .arch armv8-a
> - .fpu crypto-neon-fp-armv8
>
> .macro __pmull_p64, rd, rn, rm, b1, b2, b3, b4
> vmull.p64 \rd, \rn, \rm
> --
> 2.25.1
>
> --
> You received this message because you are subscribed to the Google Groups "Clang Built Linux" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/c41cc67321d0b366e356440e6dbc9eceb1babfe4.1583105749.git.stefan%40agner.ch.
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2020-03-03 22:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-01 23:37 [PATCH] crypto: arm/ghash-ce - define fpu before fpu registers are referenced Stefan Agner
2020-03-03 22:20 ` Nick Desaulniers [this message]
2020-03-04 7:39 ` Ard Biesheuvel
2020-03-06 1:52 ` Herbert Xu
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