From 98f12c0a80ae19316c1b32f610d094aaae2c5fc0 Mon Sep 17 00:00:00 2001 From: Behan Webster Date: Wed, 27 Aug 2014 05:29:29 +0100 Subject: arm64: LLVMLinux: Add current_stack_pointer() for arm64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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 Reviewed-by: Olof Johansson Acked-by: Will Deacon Signed-off-by: Will Deacon (cherry picked from commit 3337a10e0d0cbc9225cefc23aa7a604b698367ed) Signed-off-by: Mark Brown --- arch/arm64/include/asm/thread_info.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/arm64/include') diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index 23a3c4791d86..5093806522e1 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -68,6 +68,11 @@ 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 from C + */ +register unsigned long current_stack_pointer asm ("sp"); + /* * how to get the thread information struct from C */ -- cgit v1.2.3