Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755959AbaG3X5t (ORCPT ); Wed, 30 Jul 2014 19:57:49 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:46314 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755091AbaG3X5q (ORCPT ); Wed, 30 Jul 2014 19:57:46 -0400 From: behanw@converseincode.com To: ard.biesheuvel@linaro.org, catalin.marinas@arm.com, k.khlebnikov@samsung.com, olof@lixom.net, peterz@infradead.org, takahiro.akashi@linaro.org, tglx@linutronix.de, will.deacon@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, mingo@kernel.org, dwmw2@infradead.org, Behan Webster Subject: [PATCH 1/4] arm64: LLVMLinux: Add current_stack_pointer() for arm64 Date: Wed, 30 Jul 2014 16:57:26 -0700 Message-Id: <1406764649-20326-2-git-send-email-behanw@converseincode.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1406764649-20326-1-git-send-email-behanw@converseincode.com> References: <1406764649-20326-1-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 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 Möller Reviewed-by: Mark Charlebois --- arch/arm64/include/asm/thread_info.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index e40b6d0..e6b6094 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -69,6 +69,11 @@ struct 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 */ static inline struct thread_info *current_thread_info(void) __attribute_const__; -- 1.9.1 -- 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/