linux-kernel - [PATCH v2 1/7] arm: LLVMLinux: Add global named register current_stack

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Date:	Fri,  5 Sep 2014 17:06:11 -0700
From:	behanw@...verseincode.com
To:	a.ryabinin@...sung.com, anurag19aggarwal@...il.com,
	charlebm@...il.com, cl@...ux-foundation.org, dave.long@...aro.org,
	k.khlebnikov@...sung.com, linux@....linux.org.uk,
	linyongting@...il.com, Nikolay.Borisov@....com, tglx@...utronix.de,
	tj@...nel.org, u.kleine-koenig@...gutronix.de
Cc:	behanw@...verseincode.com, Dave.Martin@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	rabin@....in, rostedt@...dmis.org, rric@...nel.org,
	will.deacon@....com
Subject: [PATCH v2 1/7] arm: LLVMLinux: Add global named register current_stack_pointer for ARM

From: Behan Webster <behanw@...verseincode.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@...verseincode.com>
Reviewed-by: Jan-Simon Möller <dl9pf@....de>
Reviewed-by: Mark Charlebois <charlebm@...il.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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