linux-kernel - [PATCH 1/4] arm64: LLVMLinux: Add current_stack

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Date:	Wed, 30 Jul 2014 16:57:26 -0700
From:	behanw@...verseincode.com
To:	ard.biesheuvel@...aro.org, catalin.marinas@....com,
	k.khlebnikov@...sung.com, olof@...om.net, peterz@...radead.org,
	takahiro.akashi@...aro.org, tglx@...utronix.de, will.deacon@....com
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	mingo@...nel.org, dwmw2@...radead.org,
	Behan Webster <behanw@...verseincode.com>
Subject: [PATCH 1/4] arm64: LLVMLinux: Add current_stack_pointer() for arm64

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/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

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