linux-kernel - [PATCH v10 02/20] x86/asm: Add C versions of frame pointer macros

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Message-Id: <a857bf5ddcc662a40960788e1aca5f664b193675.1439521412.git.jpoimboe@redhat.com>
Date:	Thu, 13 Aug 2015 22:10:23 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
	"Chris J Arges" <chris.j.arges@...onical.com>,
	live-patching@...r.kernel.org
Subject: [PATCH v10 02/20] 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>
---
 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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