ARM: 8170/1: Add global named register current_stack_pointer for ARM
authorBehan Webster <behanw@converseincode.com>
Fri, 26 Sep 2014 23:31:04 +0000 (00:31 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Thu, 13 Nov 2014 23:58:00 +0000 (23:58 +0000)
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>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/include/asm/thread_info.h

index fc44d3761f9e7d36eb8ff4911ff0120a63e7584f..bb435152189fd7b2df6b02a5ce0cc925aae5125e 100644 (file)
@@ -100,6 +100,11 @@ struct thread_info {
 #define init_thread_info       (init_thread_union.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
  */