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| author |  Kalesh Singh <kaleshsingh@google.com>
| 2022-07-26 00:37:39 -0700 |
|---|---|---|
| committer |  Marc Zyngier <maz@kernel.org>
| 2022-07-26 10:48:54 +0100 |
| commit | 051ece6758cc10c2a6f1700ffe86d23fbb0b2553 (patch) | |
| tree | e692f5151f3a844a987a5b6ca04dda1c5c8ea2b7 /arch/arm64 | |
| parent | arm64: stacktrace: Factor out common unwind() (diff) | |
| download | linux-051ece6758cc10c2a6f1700ffe86d23fbb0b2553.tar.gz linux-051ece6758cc10c2a6f1700ffe86d23fbb0b2553.tar.bz2 linux-051ece6758cc10c2a6f1700ffe86d23fbb0b2553.zip | |
arm64: stacktrace: Add description of stacktrace/common.h
Add brief description on how to use stacktrace/common.h to implement
a stack unwinder.
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220726073750.3219117-7-kaleshsingh@google.com
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/stacktrace/common.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/stacktrace/common.h b/arch/arm64/include/asm/stacktrace/common.h index 4b632141d91c..45474b383630 100644 --- a/arch/arm64/include/asm/stacktrace/common.h +++ b/arch/arm64/include/asm/stacktrace/common.h @@ -2,6 +2,21 @@ /* * Common arm64 stack unwinder code. * + * 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. + * + * See: arch/arm64/include/asm/stacktrace.h for reference + * implementations. + * * Copyright (C) 2012 ARM Ltd. */ #ifndef __ASM_STACKTRACE_COMMON_H |