Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752451Ab3IFVak (ORCPT ); Fri, 6 Sep 2013 17:30:40 -0400 Received: from mail-ie0-f171.google.com ([209.85.223.171]:38899 "EHLO mail-ie0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750807Ab3IFVaj (ORCPT ); Fri, 6 Sep 2013 17:30:39 -0400 From: behanw@converseincode.com To: linux@arm.linux.org.uk Cc: behanw@converseincode.com, Will Deacon , Wade Farnsworth , Will Drewry , linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 1/5] arm: LLVMLinux: Add current_stack_pointer macro for ARM Date: Fri, 6 Sep 2013 17:28:07 -0400 Message-Id: <1378502899-1241-2-git-send-email-behanw@converseincode.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1378502899-1241-1-git-send-email-behanw@converseincode.com> References: <1378502899-1241-1-git-send-email-behanw@converseincode.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1505 Lines: 43 From: Behan Webster 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 Signed-off-by: Behan Webster Reviewed-by: Jan-Simon Möller --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/