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MdePkg/BaseRngLib AARCH64: Make asm files BTI compatible 

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>
This commit is contained in:
Ard Biesheuvel 2023-03-25 18:12:55 +01:00 committed by mergify[bot]
parent 35318c2eb9
commit f8b1854b92
2 changed files with 2 additions and 2 deletions
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3
MdePkg/Library/BaseRngLib/AArch64/ArmReadIdIsar0.S
View File

@ -25,7 +25,6 @@ GCC_ASM_EXPORT(ArmReadIdIsar0)
# );
#
ASM_PFX(ArmReadIdIsar0):
AARCH64_BTI(c)
mrs x0, id_aa64isar0_el1 // Read ID_AA64ISAR0 Register
ret

1
MdePkg/Library/BaseRngLib/AArch64/ArmRng.S
View File

@ -31,6 +31,7 @@ GCC_ASM_EXPORT(ArmRndr)
# );
#
ASM_PFX(ArmRndr):
AARCH64_BTI(c)
mrs x1, RNDR
str x1, [x0]
cset x0, ne // RNDR sets NZCV to 0b0100 on failure