From 0ea2dc7cd668be5475babecaf6fdeaa464e2847b Mon Sep 17 00:00:00 2001
From: Guo Ren <ren_guo@c-sky.com>
Date: Sun, 9 Dec 2018 14:18:05 +0800
Subject: csky: stacktrace supported.

The gcc option "-mbacktrace" will push fp(r8),lr into stack and we could
unwind the stack with:
	fp = *fp
	lr = (unsigned int *)fp[1]

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 arch/csky/include/asm/thread_info.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'arch/csky/include/asm')

diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h
index a2c69a7836f7..0e9d035d712b 100644
--- a/arch/csky/include/asm/thread_info.h
+++ b/arch/csky/include/asm/thread_info.h
@@ -10,6 +10,7 @@
 #include <asm/types.h>
 #include <asm/page.h>
 #include <asm/processor.h>
+#include <abi/switch_context.h>
 
 struct thread_info {
 	struct task_struct	*task;
@@ -36,6 +37,9 @@ struct thread_info {
 
 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
 
+#define thread_saved_fp(tsk) \
+	((unsigned long)(((struct switch_stack *)(tsk->thread.ksp))->r8))
+
 static inline struct thread_info *current_thread_info(void)
 {
 	unsigned long sp;
-- 
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