[tip:x86/asm] x86/asm: Clean up frame pointer macros

From: tip-bot for Josh Poimboeuf
Date: Tue Jan 19 2016 - 08:41:20 EST

Commit-ID: 997963edd912a6d77d68b2bbc19f40ce8facabd7
Gitweb: http://git.kernel.org/tip/997963edd912a6d77d68b2bbc19f40ce8facabd7
Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate: Fri, 18 Dec 2015 06:39:18 -0600
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 Jan 2016 12:59:07 +0100

x86/asm: Clean up frame pointer macros

The asm macros for setting up and restoring the frame pointer
aren't currently being used. However, they will be needed soon
to help asm functions to comply with stacktool.

symmetry. Also make the code more readable and improve the

Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Bernd Petrovitsch <bernd@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Pedro Alves <palves@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/3f488a8e3bfc8ac7d4d3d350953e664e7182b044.1450442274.git.jpoimboe@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
arch/x86/include/asm/frame.h | 43 +++++++++++++++++++++++++++----------------
1 file changed, 27 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/frame.h b/arch/x86/include/asm/frame.h
index 793179c..cec213b 100644
--- a/arch/x86/include/asm/frame.h
+++ b/arch/x86/include/asm/frame.h
@@ -1,23 +1,34 @@
+#ifndef _ASM_X86_FRAME_H
+#define _ASM_X86_FRAME_H
#ifdef __ASSEMBLY__

#include <asm/asm.h>

-/* The annotation hides the frame from the unwinder and makes it look
- like a ordinary ebp save/restore. This avoids some special cases for
- frame pointer later */
+ * These are stack frame creation macros. They should be used by every
+ * callable non-leaf asm function to make kernel stack traces more reliable.
+ */
- .macro FRAME
- __ASM_SIZE(push,) %__ASM_REG(bp)
- __ASM_SIZE(mov) %__ASM_REG(sp), %__ASM_REG(bp)
- .endm
- .macro ENDFRAME
- __ASM_SIZE(pop,) %__ASM_REG(bp)
- .endm
- .macro FRAME
- .endm
- .macro ENDFRAME
- .endm
+ push %_ASM_BP
+.macro FRAME_END
+ pop %_ASM_BP
+#define FRAME_OFFSET __ASM_SEL(4, 8)
+#define FRAME_BEGIN
+#define FRAME_END
+#define FRAME_OFFSET 0

#endif /* __ASSEMBLY__ */
+#endif /* _ASM_X86_FRAME_H */