diff options
| author | Mark Brown <[email protected]> | 2021-12-14 15:27:12 +0000 |
|---|---|---|
| committer | Catalin Marinas <[email protected]> | 2021-12-14 18:12:58 +0000 |
| commit | 9be34be87cc8d1afe3c3bc2e645b4dee512d9eda (patch) | |
| tree | 07006b3125d6a9bcee977cb2367d0b92d2c97819 /arch/arm64/include/asm/assembler.h | |
| parent | 580b536b504fb13bea6e19e399e207e7253ca30a (diff) | |
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 <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
Diffstat (limited to 'arch/arm64/include/asm/assembler.h')
| -rw-r--r-- | arch/arm64/include/asm/assembler.h | 10 |
1 files changed, 10 insertions, 0 deletions
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 @@ -791,6 +791,16 @@ alternative_endif .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 * use in assembly files included in the VDSO. |