From: Behan Webster <beh...@converseincode.com>
A macro to get the current stack pointer which allows for a single place in
which to do so with ASM. Before this named registers (a gcc extension) was used
to get the stack pointer. Using ASM is a more portable way of getting the stack
pointer which works with both gcc and clang. This macro is of the same name
used in the X86 arch.
Author: Behan Webster <beh...@converseincode.com>
Signed-off-by: Behan Webster <beh...@converseincode.com>
Reviewed-by: Jan-Simon Möller <dl...@gmx.de>
---
arch/arm/include/asm/thread_info.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm/include/asm/thread_info.h
b/arch/arm/include/asm/thread_info.h
index df5e13d..94283f8 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -100,6 +100,15 @@ struct thread_info {
#define init_stack (init_thread_union.stack)
/*
+ * how to get the current stack pointer from C
+ */
+#define current_stack_pointer ({ \
+ unsigned long current_sp; \
+ asm ("mov %0, r13" : "=r" (current_sp)); \
+ current_sp; \
+})
+
+/*
* how to get the thread information struct from C
*/
static inline struct thread_info *current_thread_info(void)
__attribute_const__;
--
1.8.1.2
--
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