[ARM] 5382/1: unwind: Reorganise the stacktrace support

This patch changes the walk_stacktrace and its callers for easier
integration of stack unwinding. The arch/arm/kernel/stacktrace.h file is
also moved to arch/arm/include/asm/stacktrace.h.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm/include/asm/stacktrace.h b/arch/arm/include/asm/stacktrace.h
new file mode 100644
index 00000000000..4d0a16441b2
--- /dev/null
+++ b/arch/arm/include/asm/stacktrace.h
@@ -0,0 +1,15 @@
+#ifndef __ASM_STACKTRACE_H
+#define __ASM_STACKTRACE_H
+
+struct stackframe {
+        unsigned long fp;
+        unsigned long sp;
+        unsigned long lr;
+        unsigned long pc;
+};
+
+extern int unwind_frame(struct stackframe *frame);
+extern void walk_stackframe(struct stackframe *frame,
+                            int (*fn)(struct stackframe *, void *), void *data);
+
+#endif  /* __ASM_STACKTRACE_H */
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index b9dc8a84257..4f8848260ee 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -99,6 +99,8 @@ static inline struct thread_info *current_thread_info(void)
 
 #define thread_saved_pc(tsk)    \
         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
+#define thread_saved_sp(tsk)    \
+        ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
 #define thread_saved_fp(tsk)    \
         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))