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arm64: enable armv8.5-a asm-arch option

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Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) which is
an armv8.5-a architecture extension.

Enable the correct asm option when the compiler supports it in order to
allow the usage of ALTERNATIVE()s with MTE instructions.

Link: https://lkml.kernel.org/r/d03d1157124ea3532eaeb77507988733f5734986.1606161801.git.andreyknvl@google.com
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vincenzo Frascino 2020-12-22 12:01:24 -08:00 • committed by Linus Torvalds
parent 6a63a63ff1
commit f469c032c0
2 changed files with 9 additions and 0 deletions
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4
arch/arm64/Kconfig
View file

@ -1571,6 +1571,9 @@ endmenu
menu "ARMv8.5 architectural features" menu "ARMv8.5 architectural features"
config AS_HAS_ARMV8_5
def_bool $(cc-option,-Wa$(comma)-march=armv8.5-a)
config ARM64_BTI config ARM64_BTI
bool "Branch Target Identification support" bool "Branch Target Identification support"
default y default y
@ -1645,6 +1648,7 @@ config ARM64_MTE
bool "Memory Tagging Extension support" bool "Memory Tagging Extension support"
default y default y
depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI
depends on AS_HAS_ARMV8_5
select ARCH_USES_HIGH_VMA_FLAGS select ARCH_USES_HIGH_VMA_FLAGS
help help
Memory Tagging (part of the ARMv8.5 Extensions) provides Memory Tagging (part of the ARMv8.5 Extensions) provides

5
arch/arm64/Makefile
View file

@ -96,6 +96,11 @@ ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
asm-arch := armv8.4-a asm-arch := armv8.4-a
endif endif
ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
# make sure to pass the newest target architecture to -march.
asm-arch := armv8.5-a
endif
ifdef asm-arch ifdef asm-arch
KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \
-DARM64_ASM_ARCH='"$(asm-arch)"' -DARM64_ASM_ARCH='"$(asm-arch)"'