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arm64: unwind: add asynchronous unwind tables to kernel and modules

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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>
This commit is contained in:
Ard Biesheuvel
2022-10-27 17:59:06 +02:00
committed by Will Deacon
parent f0c4d9fc9c
commit 68c76ad4a9
9 changed files with 45 additions and 2 deletions
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13
arch/arm64/kernel/vmlinux.lds.S
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@@ -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 = .;