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authorJason A. Donenfeld2018-10-02 15:01:24 +0100
committerRussell King2018-10-04 14:48:59 +0100
commit8403bcb779a0be4080510c59b1a582e6ab7a748c (patch)
tree98336755cac0cf00e7d94cfd724f9c2605aca144
parentf9b58e8c7d031b0daa5c9a9ee27f5a4028ba53ac (diff)
ARM: 8801/1: makefile: use ARMv3M mode for RiscPC
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> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
-rw-r--r--arch/arm/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 06ebff73273f..5c91e0093ee8 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)