linux-kernel - [PATCH v5 06/17] arm64: stacktrace: Add description of stacktrace/common.h

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Date:   Wed, 20 Jul 2022 22:57:17 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     maz@...nel.org, mark.rutland@....com, broonie@...nel.org,
        madvenka@...ux.microsoft.com, tabba@...gle.com
Cc:     will@...nel.org, qperret@...gle.com, kaleshsingh@...gle.com,
        james.morse@....com, alexandru.elisei@....com,
        suzuki.poulose@....com, catalin.marinas@....com,
        andreyknvl@...il.com, vincenzo.frascino@....com,
        mhiramat@...nel.org, ast@...nel.org, drjones@...hat.com,
        wangkefeng.wang@...wei.com, elver@...gle.com, keirf@...gle.com,
        yuzenghui@...wei.com, ardb@...nel.org, oupton@...gle.com,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, android-mm@...gle.com,
        kernel-team@...roid.com
Subject: [PATCH v5 06/17] 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@...gle.com>
---

Changes in v5:
  - Add short description of each required function, per Fuad and Marc
  - Add Reviewed-by tag from Fuad

 arch/arm64/include/asm/stacktrace/common.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/include/asm/stacktrace/common.h b/arch/arm64/include/asm/stacktrace/common.h
index 7807752aaab1..be7920ba70b0 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
-- 
2.37.0.170.g444d1eabd0-goog