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[96.50.97.138]) by mx.google.com with ESMTPSA id dn5sm5029335pbb.2.2014.08.26.21.29.41 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 26 Aug 2014 21:29:42 -0700 (PDT) From: behanw@converseincode.com To: ard.biesheuvel@linaro.org, catalin.marinas@arm.com, cl@linux-foundation.org, jays.lee@samsung.com, k.khlebnikov@samsung.com, larry.bassel@linaro.org, olof@lixom.net, peterz@infradead.org, takahiro.akashi@linaro.org, tglx@linutronix.de, tj@kernel.org, will.deacon@arm.com Cc: christoffer.dall@linaro.org, kgene.kim@samsung.com, khilman@linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, sungjinn.chung@samsung.com, Behan Webster Subject: [PATCH V2 1/6] arm64: LLVMLinux: Add current_stack_pointer() for arm64 Date: Tue, 26 Aug 2014 21:29:29 -0700 Message-Id: <1409113774-3172-2-git-send-email-behanw@converseincode.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1409113774-3172-1-git-send-email-behanw@converseincode.com> References: <20140826141608.GT23445@arm.com> <1409113774-3172-1-git-send-email-behanw@converseincode.com> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Original-Sender: behanw@converseincode.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 2607:f8b0:4002:c07::22a as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org; dkim=neutral (body hash did not verify) header.i=@ Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , 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 Reviewed-by: Olof Johansson Acked-by: Will Deacon --- 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 45108d8..356e037 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__;