From 0abc08baf2ddf61a37d375a9fb832be612f9c5a5 Mon Sep 17 00:00:00 2001 From: Behan Webster Date: Sat, 27 Sep 2014 00:31:04 +0100 Subject: [PATCH] ARM: 8170/1: Add global named register current_stack_pointer for ARM MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Define a global named register for current_stack_pointer. The use of this new variable guarantees that both gcc and clang can access this register in C code. Signed-off-by: Behan Webster Reviewed-by: Jan-Simon Möller Reviewed-by: Mark Charlebois Acked-by: Will Deacon Acked-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/include/asm/thread_info.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index fc44d3761f9e..bb435152189f 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -100,6 +100,11 @@ struct thread_info { #define init_thread_info (init_thread_union.thread_info) #define init_stack (init_thread_union.stack) +/* + * how to get the current stack pointer in C + */ +register unsigned long current_stack_pointer asm ("sp"); + /* * how to get the thread information struct from C */ -- 2.20.1