From 9be34be87cc8d1afe3c3bc2e645b4dee512d9eda Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Tue, 14 Dec 2021 15:27:12 +0000 Subject: arm64: Add macro version of the BTI instruction BTI is only available from v8.5 so we need to encode it using HINT in generic code and for older toolchains. Add an assembler macro based on one written by Mark Rutland which lets us use the mnemonic and update the existing users. Suggested-by: Mark Rutland Acked-by: Ard Biesheuvel Acked-by: Will Deacon Signed-off-by: Mark Brown Acked-by: Mark Rutland Link: https://lore.kernel.org/r/20211214152714.2380849-2-broonie@kernel.org Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/assembler.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/arm64/include/asm/assembler.h') diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 136d13f3d6e9..e8bd0af0141c 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -790,6 +790,16 @@ alternative_endif .Lnoyield_\@: .endm +/* + * Branch Target Identifier (BTI) + */ + .macro bti, targets + .equ .L__bti_targets_c, 34 + .equ .L__bti_targets_j, 36 + .equ .L__bti_targets_jc,38 + hint #.L__bti_targets_\targets + .endm + /* * This macro emits a program property note section identifying * architecture features which require special handling, mainly for -- cgit v1.2.3