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arm64: errata: Pass --fix-cortex-a53-843419 to ld if workaround enabled 

Cortex-A53 erratum 843419 is worked around by the linker, although it is
a configure-time option to GCC as to whether ld is actually asked to
apply the workaround or not.

This patch ensures that we pass --fix-cortex-a53-843419 to the linker
when both CONFIG_ARM64_ERRATUM_843419=y and the linker supports the
option.

Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Will Deacon 2016-08-22 11:58:36 +01:00
parent b2d8b0cb6c
commit 6ffe9923f2
2 changed files with 13 additions and 10 deletions
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15
arch/arm64/Kconfig
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@ -418,18 +418,13 @@ config ARM64_ERRATUM_845719
config ARM64_ERRATUM_843419
bool "Cortex-A53: 843419: A load or store might access an incorrect address"
depends on MODULES
default y
select ARM64_MODULE_CMODEL_LARGE
select ARM64_MODULE_CMODEL_LARGE if MODULES
help
This option builds kernel modules using the large memory model in
order to avoid the use of the ADRP instruction, which can cause
a subsequent memory access to use an incorrect address on Cortex-A53
parts up to r0p4.
Note that the kernel itself must be linked with a version of ld
which fixes potentially affected ADRP instructions through the
use of veneers.
This option links the kernel with '--fix-cortex-a53-843419' and
builds modules using the large memory model in order to avoid the use
of the ADRP instruction, which can cause a subsequent memory access
to use an incorrect address on Cortex-A53 parts up to r0p4.
If unsure, say Y.

8
arch/arm64/Makefile
View File

@ -18,6 +18,14 @@ ifneq ($(CONFIG_RELOCATABLE),)
LDFLAGS_vmlinux += -pie -Bsymbolic
endif
ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
ifeq ($(call ld-option, --fix-cortex-a53-843419),)
$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
else
LDFLAGS_vmlinux += --fix-cortex-a53-843419
endif
endif
KBUILD_DEFCONFIG := defconfig
# Check for binutils support for specific extensions