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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	davem@davemloft.net, gregkh@linuxfoundation.org
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
Subject: [PATCH net-next v7 01/28] ARM: makefile: use ARMv3M mode for RiscPC
Date: Sat,  6 Oct 2018 04:56:42 +0200	[thread overview]
Message-ID: <20181006025709.4019-2-Jason@zx2c4.com> (raw)
In-Reply-To: <20181006025709.4019-1-Jason@zx2c4.com>

The purpose of CONFIG_CPU_32v3 is to avoid ldrh/strh on the RiscPC,
which is pretty much an ARMv4 device, except its bus will choke on the
half-words. The way to make the C compiler not output ldrh/strh is with
-march=armv3, which doesn't support them in the ISA. However, this
prevents certain cryptography code from working that uses instructions
like umull. Fortunately there's also -march=armv3m that does support
those, making it possible to continue assembling optimized cryptography
routines for our beloved RiscPC.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---

Notes:
    This commit has been submitted to the proper ARM tree and is working its
    way upstream. It's included in this series here so that kbuild 0-day bot
    doesn't get too nervous about RiscPC, but is already entering the tree
    through arm-next.

 arch/arm/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index d1516f85f25d..7fd4bcaf0721 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -74,7 +74,7 @@ endif
 arch-$(CONFIG_CPU_32v5)		=-D__LINUX_ARM_ARCH__=5 $(call cc-option,-march=armv5te,-march=armv4t)
 arch-$(CONFIG_CPU_32v4T)	=-D__LINUX_ARM_ARCH__=4 -march=armv4t
 arch-$(CONFIG_CPU_32v4)		=-D__LINUX_ARM_ARCH__=4 -march=armv4
-arch-$(CONFIG_CPU_32v3)		=-D__LINUX_ARM_ARCH__=3 -march=armv3
+arch-$(CONFIG_CPU_32v3)		=-D__LINUX_ARM_ARCH__=3 -march=armv3m
 
 # Evaluate arch cc-option calls now
 arch-y := $(arch-y)
-- 
2.19.0


  reply	other threads:[~2018-10-06  2:57 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-06  2:56 [PATCH net-next v7 00/28] WireGuard: Secure Network Tunnel Jason A. Donenfeld
2018-10-06  2:56 ` Jason A. Donenfeld [this message]
2018-10-06  2:56 ` [PATCH net-next v7 02/28] asm: simd context helper API Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 03/28] zinc: introduce minimal cryptography library Jason A. Donenfeld
2018-10-08 23:22   ` Eric Biggers
2018-10-06  2:56 ` [PATCH net-next v7 04/28] zinc: ChaCha20 generic C implementation and selftest Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 05/28] zinc: import Andy Polyakov's ChaCha20 x86_64 implementation Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 06/28] zinc: " Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 07/28] zinc: import Andy Polyakov's ChaCha20 ARM and ARM64 implementations Jason A. Donenfeld
2018-10-06  2:56   ` Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 08/28] zinc: port " Jason A. Donenfeld
2018-10-06  2:56   ` Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 09/28] zinc: " Jason A. Donenfeld
2018-10-06  2:56   ` Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 10/28] zinc: ChaCha20 MIPS32r2 implementation Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 11/28] zinc: Poly1305 generic C implementations and selftest Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 12/28] zinc: import Andy Polyakov's Poly1305 x86_64 implementation Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 13/28] zinc: " Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 14/28] zinc: import Andy Polyakov's Poly1305 ARM and ARM64 implementations Jason A. Donenfeld
2018-10-06  2:56   ` Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 15/28] zinc: " Jason A. Donenfeld
2018-10-06  2:56   ` Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 16/28] zinc: import Andy Polyakov's Poly1305 MIPS64 implementation Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 17/28] zinc: Poly1305 MIPS32r2 and MIPS64 implementations Jason A. Donenfeld
2018-10-06  2:56 ` [PATCH net-next v7 18/28] zinc: ChaCha20Poly1305 construction and selftest Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 19/28] zinc: BLAKE2s generic C implementation " Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 20/28] zinc: BLAKE2s x86_64 implementation Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 21/28] zinc: Curve25519 generic C implementations and selftest Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 22/28] zinc: Curve25519 x86_64 implementation Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 23/28] zinc: import Bernstein and Schwabe's Curve25519 ARM implementation Jason A. Donenfeld
2018-10-06  2:57   ` Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 24/28] zinc: " Jason A. Donenfeld
2018-10-06  2:57   ` Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 25/28] crypto: port Poly1305 to Zinc Jason A. Donenfeld
2018-10-08 23:21   ` Eric Biggers
2018-10-09  0:02     ` Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 26/28] crypto: port ChaCha20 " Jason A. Donenfeld
2018-10-06 13:07   ` Martin Willi
2018-10-06 13:07     ` Martin Willi
2018-10-06  2:57 ` [PATCH net-next v7 27/28] security/keys: rewrite big_key crypto to use Zinc Jason A. Donenfeld
2018-10-06  2:57 ` [PATCH net-next v7 28/28] net: WireGuard secure network tunnel Jason A. Donenfeld
2018-10-06  6:58   ` Jiri Pirko
2018-10-06 12:25     ` Jason A. Donenfeld
2018-10-07 17:26     ` Jason A. Donenfeld
2018-10-07 18:14       ` Lukas Wunner
2018-10-07 18:42         ` Andrew Lunn
2018-10-10  9:13       ` Jiri Pirko
2018-10-10 20:27         ` Jason A. Donenfeld
2018-10-11  5:36           ` Jiri Pirko
2018-10-06 19:43   ` Eugene Syromiatnikov
2018-10-08  1:06     ` Jason A. Donenfeld
2018-10-06 23:54   ` Andrew Lunn
2018-10-07  1:57     ` Jason A. Donenfeld
2018-10-07 16:48       ` Andrew Lunn
2018-10-07 16:55         ` Jason A. Donenfeld

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