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arm64: stacktrace: Add description of stacktrace/common.h

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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
This commit is contained in:
Kalesh Singh
2022-07-26 00:37:39 -07:00
committed by Marc Zyngier
parent f51e714674
commit 051ece6758
1 changed files with 15 additions and 0 deletions
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15
arch/arm64/include/asm/stacktrace/common.h
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@@ -2,6 +2,21 @@
/* /*
* Common arm64 stack unwinder code. * 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. * Copyright (C) 2012 ARM Ltd.
*/ */
#ifndef __ASM_STACKTRACE_COMMON_H #ifndef __ASM_STACKTRACE_COMMON_H