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[V2,1/6] arm64: LLVMLinux: Add current_stack_pointer() for arm64

Message ID 1409113774-3172-2-git-send-email-behanw@converseincode.com
State Accepted
Commit 3337a10e0d0cbc9225cefc23aa7a604b698367ed
Headers show

Commit Message

Behan Webster Aug. 27, 2014, 4:29 a.m. UTC 
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>
Reviewed-by: Olof Johansson <olof@lixom.net>
Acked-by: Will Deacon <will.deacon@arm.com>
---
 arch/arm64/include/asm/thread_info.h | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

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__;