From: behanw@converseincode.com To: a.ryabinin@samsung.com, anurag19aggarwal@gmail.com, charlebm@gmail.com, cl@linux-foundation.org, dave.long@linaro.org, k.khlebnikov@samsung.com, linux@arm.linux.org.uk, linyongting@gmail.com, Nikolay.Borisov@arm.com, tglx@linutronix.de, tj@kernel.org, u.kleine-koenig@pengutronix.de Cc: behanw@converseincode.com, Dave.Martin@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, rabin@rab.in, rostedt@goodmis.org, rric@kernel.org, will.deacon@arm.com Subject: [PATCH v2 1/7] arm: LLVMLinux: Add global named register current_stack_pointer for ARM Date: Fri, 5 Sep 2014 17:06:11 -0700 [thread overview] Message-ID: <1409961977-11762-2-git-send-email-behanw@converseincode.com> (raw) In-Reply-To: <1409961977-11762-1-git-send-email-behanw@converseincode.com> From: Behan Webster <behanw@converseincode.com> 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 <behanw@converseincode.com> Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de> Reviewed-by: Mark Charlebois <charlebm@gmail.com> --- 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 fc44d37..bb43515 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -101,6 +101,11 @@ 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
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From: behanw@converseincode.com (behanw at converseincode.com) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 1/7] arm: LLVMLinux: Add global named register current_stack_pointer for ARM Date: Fri, 5 Sep 2014 17:06:11 -0700 [thread overview] Message-ID: <1409961977-11762-2-git-send-email-behanw@converseincode.com> (raw) In-Reply-To: <1409961977-11762-1-git-send-email-behanw@converseincode.com> From: Behan Webster <behanw@converseincode.com> 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 <behanw@converseincode.com> Reviewed-by: Jan-Simon M?ller <dl9pf@gmx.de> Reviewed-by: Mark Charlebois <charlebm@gmail.com> --- 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 fc44d37..bb43515 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -101,6 +101,11 @@ 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
next prev parent reply other threads:[~2014-09-06 0:06 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-09-06 0:06 [PATCH v2 0/7] LLVMLinux: Patches to enable the kernel to be compiled with clang/LLVM behanw 2014-09-06 0:06 ` behanw at converseincode.com 2014-09-06 0:06 ` behanw [this message] 2014-09-06 0:06 ` [PATCH v2 1/7] arm: LLVMLinux: Add global named register current_stack_pointer for ARM behanw at converseincode.com 2014-09-06 0:06 ` [PATCH v2 2/7] arm: LLVMLinux: Use current_stack_pointer to calculate pt_regs address behanw 2014-09-06 0:06 ` behanw at converseincode.com 2014-09-06 0:06 ` [PATCH v2 3/7] arm: LLVMLinux: Use current_stack_pointer for return_address behanw 2014-09-06 0:06 ` behanw at converseincode.com 2014-09-06 0:06 ` [PATCH v2 4/7] arm: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk behanw 2014-09-06 0:06 ` behanw at converseincode.com 2014-09-06 0:06 ` [PATCH v2 5/7] arm: LLVMLinux: Calculate current_thread_info from current_stack_pointer behanw 2014-09-06 0:06 ` behanw at converseincode.com 2014-09-06 0:06 ` [PATCH v2 6/7] arm: LLVMLinux: Use current_stack_pointer in unwind_backtrace behanw 2014-09-06 0:06 ` behanw at converseincode.com 2014-09-06 0:06 ` [PATCH v2 7/7] arm: LLVMLinux: Use global stack register variable for percpu behanw 2014-09-06 0:06 ` behanw at converseincode.com
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