c4c7fb2174
Add the BTI instructions and the associated note to make the AArch64 asm objects compatible with BTI enforcement. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com> Reviewed-by: Oliver Smith-Denny <osd@smith-denny.com>
35 lines
704 B
ArmAsm
35 lines
704 B
ArmAsm
##------------------------------------------------------------------------------
|
|
#
|
|
# SpeculationBarrier() for AArch64
|
|
#
|
|
# Copyright (c) 2019, Linaro Ltd. All rights reserved.
|
|
#
|
|
# SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
#
|
|
##------------------------------------------------------------------------------
|
|
|
|
.text
|
|
.p2align 2
|
|
|
|
GCC_ASM_EXPORT(SpeculationBarrier)
|
|
|
|
|
|
#/**
|
|
# Uses as a barrier to stop speculative execution.
|
|
#
|
|
# Ensures that no later instruction will execute speculatively, until all prior
|
|
# instructions have completed.
|
|
#
|
|
#**/
|
|
#VOID
|
|
#EFIAPI
|
|
#SpeculationBarrier (
|
|
# VOID
|
|
# );
|
|
#
|
|
ASM_PFX(SpeculationBarrier):
|
|
AARCH64_BTI(c)
|
|
dsb sy
|
|
isb
|
|
ret
|