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authorBehan Webster <behanw@converseincode.com>2014-08-27 06:29:29 +0200
committerWill Deacon <will.deacon@arm.com>2014-09-08 15:39:19 +0200
commit3337a10e0d0cbc9225cefc23aa7a604b698367ed (patch)
treeef964ab4ac4964539f16384ef362f6d1aa5d0bee /arch/arm64/include/asm/thread_info.h
parentarm64: Add CONFIG_DEBUG_SET_MODULE_RONX support (diff)
downloadlinux-3337a10e0d0cbc9225cefc23aa7a604b698367ed.tar.xz
linux-3337a10e0d0cbc9225cefc23aa7a604b698367ed.zip
arm64: LLVMLinux: Add current_stack_pointer() for arm64
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> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/thread_info.h')
-rw-r--r--arch/arm64/include/asm/thread_info.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 45108d802f5e..356e03774df4 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__;