From mboxrd@z Thu Jan 1 00:00:00 1970 From: behanw@converseincode.com (behanw at converseincode.com) Date: Tue, 8 Jul 2014 13:16:11 -0700 Subject: [PATCH 1/6] arm: LLVMLinux: Add global named register current_stack_pointer for ARM In-Reply-To: <1404850576-2006-1-git-send-email-behanw@converseincode.com> References: <1404850576-2006-1-git-send-email-behanw@converseincode.com> Message-ID: <1404850576-2006-2-git-send-email-behanw@converseincode.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Behan Webster 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 M?ller Reviewed-by: Mark Charlebois --- 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 e4e4208..9cb9c66 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_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 */ static inline struct thread_info *current_thread_info(void) __attribute_const__; -- 1.9.1