[PATCH v14 04/24] x86/asm: Add C versions of frame pointer macros

From: Josh Poimboeuf
Date: Wed Oct 21 2015 - 12:22:36 EST


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 | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/frame.h b/arch/x86/include/asm/frame.h
index cec213b..6e4d170 100644
--- a/arch/x86/include/asm/frame.h
+++ b/arch/x86/include/asm/frame.h
@@ -1,16 +1,17 @@
#ifndef _ASM_X86_FRAME_H
#define _ASM_X86_FRAME_H

-#ifdef __ASSEMBLY__
-
#include <asm/asm.h>

/*
* These are stack frame creation macros. They should be used by every
* callable non-leaf asm function to make kernel stack traces more reliable.
*/
+
#ifdef CONFIG_FRAME_POINTER

+#ifdef __ASSEMBLY__
+
.macro FRAME_BEGIN
push %_ASM_BP
_ASM_MOV %_ASM_SP, %_ASM_BP
@@ -20,6 +21,16 @@
pop %_ASM_BP
.endm

+#else /* !__ASSEMBLY__ */
+
+#define FRAME_BEGIN \
+ "push %" _ASM_BP "\n" \
+ _ASM_MOV "%" _ASM_SP ", %" _ASM_BP "\n"
+
+#define FRAME_END "pop %" _ASM_BP "\n"
+
+#endif /* __ASSEMBLY__ */
+
#define FRAME_OFFSET __ASM_SEL(4, 8)

#else /* !CONFIG_FRAME_POINTER */
@@ -30,5 +41,4 @@

#endif /* CONFIG_FRAME_POINTER */

-#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_FRAME_H */
--
2.4.3

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