[PATCH v9 02/20] x86/asm: Add C versions of frame pointer macros

[Josh Poimboeuf]

Add C versions of the frame pointer macros which can be used to create a
stack frame in inline assembly.

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 arch/x86/include/asm/frame.h | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/frame.h b/arch/x86/include/asm/frame.h
index 8a6cd26..9a30ec7 100644
--- a/arch/x86/include/asm/frame.h
+++ b/arch/x86/include/asm/frame.h
@@ -1,10 +1,10 @@
 #ifndef _ASM_X86_FRAME_H
 #define _ASM_X86_FRAME_H
 
-#ifdef __ASSEMBLY__
-
 #include <asm/asm.h>
 
+#ifdef __ASSEMBLY__
+
 /*
  * These are stack frame creation macros.  They should be used by every
  * callable non-leaf asm function to make kernel stack traces more reliable.
@@ -22,5 +22,21 @@
 #endif
 .endm
 
+#else /* !__ASSEMBLY__ */
+
+#ifdef CONFIG_FRAME_POINTER
+
+#define FRAME_BEGIN				\
+	"push %" _ASM_BP "\n"			\
+	_ASM_MOV "%" _ASM_SP ", %" _ASM_BP "\n"
+
+#define FRAME_END "pop %" _ASM_BP "\n"
+
+#else /* !CONFIG_FRAME_POINTER */
+
+#define FRAME_BEGIN ""
+#define FRAME_END ""
+
+#endif /* CONFIG_FRAME_POINTER */
 #endif  /*  __ASSEMBLY__  */
 #endif /* _ASM_X86_FRAME_H */
-- 
2.4.3

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