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| author | Marc Zyngier <maz@kernel.org> | 2022-07-27 17:29:06 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-07-27 20:18:47 +0300 |
| commit | a4c750e2328a117dc9b19a2a61db0d4347902029 (patch) | |
| tree | 6175b5c5557b3fa55f32e9c2cc96b3733538e08c /arch/arm64 | |
| parent | 62ae21627aa96f6ef361981dd181c74dc7aa314c (diff) | |
| download | linux-a4c750e2328a117dc9b19a2a61db0d4347902029.tar.xz | |
arm64: Update 'unwinder howto'
Implementing a new unwinder is a bit more involved than writing
a couple of helpers, so let's not lure the reader into a false
sense of comfort. Instead, let's point out what they should
call into, and what sort of parameter they need to provide.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Kalesh Singh <kaleshsingh@google.com>
Tested-by: Kalesh Singh <kaleshsingh@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20220727142906.1856759-7-maz@kernel.org
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/stacktrace/common.h | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/arch/arm64/include/asm/stacktrace/common.h b/arch/arm64/include/asm/stacktrace/common.h index 18046a7248a2..f58eb944c46f 100644 --- a/arch/arm64/include/asm/stacktrace/common.h +++ b/arch/arm64/include/asm/stacktrace/common.h @@ -5,17 +5,11 @@ * To implement a new arm64 stack unwinder: * 1) Include this header * - * 2) Provide implementations for the following functions: - * on_overflow_stack(): Returns true if SP is on the overflow - * stack. - * on_accessible_stack(): Returns true is SP is on any accessible - * stack. - * unwind_next(): Performs validation checks on the frame - * pointer, and transitions unwind_state - * to the next frame. + * 2) Call into unwind_next_common() from your top level unwind + * function, passing it the validation and translation callbacks + * (though the later can be NULL if no translation is required). * - * See: arch/arm64/include/asm/stacktrace.h for reference - * implementations. + * See: arch/arm64/kernel/stacktrace.c for the reference implementation. * * Copyright (C) 2012 ARM Ltd. */ |