[PATCH 6/6] arm64: Update 'unwinder howto'
Marc Zyngier
maz at kernel.org
Wed Jul 27 07:29:06 PDT 2022
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 at kernel.org>
---
arch/arm64/include/asm/stacktrace/common.h | 14 ++++----------
1 file 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.
*/
--
2.34.1
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