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>
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2 changed files with 13 additions and 10 deletions
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@ -418,18 +418,13 @@ config ARM64_ERRATUM_845719
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config ARM64_ERRATUM_843419
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bool "Cortex-A53: 843419: A load or store might access an incorrect address"
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depends on MODULES
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default y
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select ARM64_MODULE_CMODEL_LARGE
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select ARM64_MODULE_CMODEL_LARGE if MODULES
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help
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This option builds kernel modules using the large memory model in
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order to avoid the use of the ADRP instruction, which can cause
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a subsequent memory access to use an incorrect address on Cortex-A53
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parts up to r0p4.
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Note that the kernel itself must be linked with a version of ld
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which fixes potentially affected ADRP instructions through the
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use of veneers.
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This option links the kernel with '--fix-cortex-a53-843419' and
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builds modules using the large memory model in order to avoid the use
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of the ADRP instruction, which can cause a subsequent memory access
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to use an incorrect address on Cortex-A53 parts up to r0p4.
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If unsure, say Y.
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@ -18,6 +18,14 @@ ifneq ($(CONFIG_RELOCATABLE),)
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LDFLAGS_vmlinux += -pie -Bsymbolic
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endif
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ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
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ifeq ($(call ld-option, --fix-cortex-a53-843419),)
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$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
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else
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LDFLAGS_vmlinux += --fix-cortex-a53-843419
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endif
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endif
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KBUILD_DEFCONFIG := defconfig
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# Check for binutils support for specific extensions
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