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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 /scripts/module.lds.S | |
| parent | f0c4d9fc9cc9462659728d168387191387e903cc (diff) | |
| download | linux-68c76ad4a9571a2b603665c85cf8229bcf04982a.tar.gz linux-68c76ad4a9571a2b603665c85cf8229bcf04982a.tar.bz2 linux-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 'scripts/module.lds.S')
| -rw-r--r-- | scripts/module.lds.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/scripts/module.lds.S b/scripts/module.lds.S index da4bddd26171..bf5bcf2836d8 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -3,6 +3,12 @@ * Archs are free to supply their own linker scripts. ld will * combine them automatically. */ +#ifdef CONFIG_UNWIND_TABLES +#define DISCARD_EH_FRAME +#else +#define DISCARD_EH_FRAME *(.eh_frame) +#endif + SECTIONS { /DISCARD/ : { *(.discard) |