linux-kernel - [tip:x86/asm] x86/asm: Add C versions of frame pointer macros

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Date:	Tue, 19 Jan 2016 05:40:02 -0800
From:	tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, mmarek@...e.cz, tglx@...utronix.de,
	acme@...nel.org, jslaby@...e.cz, linux-kernel@...r.kernel.org,
	luto@...capital.net, luto@...nel.org, dvlasenk@...hat.com,
	namhyung@...il.com, palves@...hat.com, mingo@...nel.org,
	jpoimboe@...hat.com, chris.j.arges@...onical.com, hpa@...or.com,
	peterz@...radead.org, bernd@...rovitsch.priv.at, bp@...en8.de,
	brgerst@...il.com
Subject: [tip:x86/asm] x86/asm: Add C versions of frame pointer macros

Commit-ID:  ec5186557abbe711dfd34e1863735dfecb0602cc
Gitweb:     http://git.kernel.org/tip/ec5186557abbe711dfd34e1863735dfecb0602cc
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Fri, 18 Dec 2015 06:39:19 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 19 Jan 2016 12:59:07 +0100

x86/asm: Add C versions of frame pointer macros

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@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Chris J Arges <chris.j.arges@...onical.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Pedro Alves <palves@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/f6786a282bf232ede3e2866414eae3cf02c7d662.1450442274.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 */