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| author | Ard Biesheuvel <ardb@kernel.org> | 2022-10-27 17:59:06 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-11-09 18:06:35 +0000 |
| commit | 68c76ad4a9571a2b603665c85cf8229bcf04982a (patch) | |
| tree | c3128c1e56df0d7ee4742775f6955b8a53092a64 /arch/arm64/Makefile | |
| parent | f0c4d9fc9cc9462659728d168387191387e903cc (diff) | |
| download | lwn-68c76ad4a9571a2b603665c85cf8229bcf04982a.tar.gz lwn-68c76ad4a9571a2b603665c85cf8229bcf04982a.zip | |
arm64: unwind: add asynchronous unwind tables to kernel and modules
Enable asynchronous unwind table generation for both the core kernel as
well as modules, and emit the resulting .eh_frame sections as init code
so we can use the unwind directives for code patching at boot or module
load time.
This will be used by dynamic shadow call stack support, which will rely
on code patching rather than compiler codegen to emit the shadow call
stack push and pop instructions.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20221027155908.1940624-2-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/Makefile')
| -rw-r--r-- | arch/arm64/Makefile | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 5e56d26a2239..7868a176993f 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -45,8 +45,13 @@ KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) # Avoid generating .eh_frame* sections. +ifneq ($(CONFIG_UNWIND_TABLES),y) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables +else +KBUILD_CFLAGS += -fasynchronous-unwind-tables +KBUILD_AFLAGS += -fasynchronous-unwind-tables +endif ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) prepare: stack_protector_prepare |