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arm64: Add macro version of the BTI instruction

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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 <mark.rutland@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20211214152714.2380849-2-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2021-12-14 15:27:12 +00:00
committed by Catalin Marinas
parent 580b536b50
commit 9be34be87c
3 changed files with 16 additions and 11 deletions
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10
arch/arm64/include/asm/assembler.h
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@@ -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