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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 19:06:35 +0100 |
| commit | 68c76ad4a9571a2b603665c85cf8229bcf04982a (patch) | |
| tree | c3128c1e56df0d7ee4742775f6955b8a53092a64 /arch/arm64/kernel/vmlinux.lds.S | |
| parent | Linux 6.1-rc4 (diff) | |
| download | linux-68c76ad4a9571a2b603665c85cf8229bcf04982a.tar.xz 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 'arch/arm64/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/arm64/kernel/vmlinux.lds.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 45131e354e27..4c13dafc98b8 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -121,6 +121,17 @@ jiffies = jiffies_64; #define TRAMP_TEXT #endif +#ifdef CONFIG_UNWIND_TABLES +#define UNWIND_DATA_SECTIONS \ + .eh_frame : { \ + __eh_frame_start = .; \ + *(.eh_frame) \ + __eh_frame_end = .; \ + } +#else +#define UNWIND_DATA_SECTIONS +#endif + /* * The size of the PE/COFF section that covers the kernel image, which * runs from _stext to _edata, must be a round multiple of the PE/COFF @@ -231,6 +242,8 @@ SECTIONS __alt_instructions_end = .; } + UNWIND_DATA_SECTIONS + . = ALIGN(SEGMENT_ALIGN); __inittext_end = .; __initdata_begin = .; |