From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>
Cc: Michal Marek <mmarek@suse.cz>, Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andi Kleen <andi@firstfloor.org>, Pedro Alves <palves@redhat.com>,
        Namhyung Kim <namhyung@gmail.com>,
        Bernd Petrovitsch <bernd@petrovitsch.priv.at>, x86@kernel.org,
        live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v8 02/21] x86/asm: Add C versions of FRAME and ENDFRAME macros
Date: Tue, 28 Jul 2015 09:46:53 -0500
Message-Id: <5a1b5dded1d7bc3e1b9777d363ac0146fa13379f.1438093915.git.jpoimboe@redhat.com>
In-Reply-To: <cover.1438093915.git.jpoimboe@redhat.com>
References: <cover.1438093915.git.jpoimboe@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1404
Lines: 55

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

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.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 a4ac454..fa38ceb 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					\
+	"push %" _ASM_BP "\n"			\
+	_ASM_MOV "%" _ASM_SP ", %" _ASM_BP "\n"
+
+#define ENDFRAME "pop %" _ASM_BP "\n"
+
+#else /* !CONFIG_FRAME_POINTER */
+
+#define FRAME ""
+#define ENDFRAME ""
+
+#endif /* CONFIG_FRAME_POINTER */
 #endif  /*  __ASSEMBLY__  */
 #endif /* _ASM_X86_FRAME_H */
-- 
2.1.0

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