diff options
Diffstat (limited to 'arch/arm64/Makefile')
| -rw-r--r-- | arch/arm64/Makefile | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index dca1a97751ab..85e4149cc5d5 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -65,6 +65,22 @@ stack_protector_prepare: prepare0 include/generated/asm-offsets.h)) endif +# Ensure that if the compiler supports branch protection we default it +# off, this will be overridden if we are using branch protection. +branch-prot-flags-y += $(call cc-option,-mbranch-protection=none) + +ifeq ($(CONFIG_ARM64_PTR_AUTH),y) +branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all +branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf +# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the +# compiler to generate them and consequently to break the single image contract +# we pass it only to the assembler. This option is utilized only in case of non +# integrated assemblers. +branch-prot-flags-$(CONFIG_AS_HAS_PAC) += -Wa,-march=armv8.3-a +endif + +KBUILD_CFLAGS += $(branch-prot-flags-y) + ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) KBUILD_CPPFLAGS += -mbig-endian CHECKFLAGS += -D__AARCH64EB__ |