linux-kernel - [PATCH v5 01/10] x86/asm: Add FP_SAVE/RESTORE frame pointer macros

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Date:	Wed, 10 Jun 2015 07:06:09 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	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>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 01/10] x86/asm: Add FP_SAVE/RESTORE frame pointer macros

Add the FP_SAVE and FP_RESTORE asm macros, which can be used to save and
restore the frame pointer.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 arch/x86/include/asm/func.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 arch/x86/include/asm/func.h

diff --git a/arch/x86/include/asm/func.h b/arch/x86/include/asm/func.h
new file mode 100644
index 0000000..4d62782
--- /dev/null
+++ b/arch/x86/include/asm/func.h
@@ -0,0 +1,24 @@
+#ifndef _ASM_X86_FUNC_H
+#define _ASM_X86_FUNC_H
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+
+/*
+ * These are frame pointer save and restore macros.  They should be used by
+ * every callable non-leaf asm function.
+ */
+.macro FP_SAVE name
+	.if CONFIG_FRAME_POINTER
+		push %_ASM_BP
+		_ASM_MOV %_ASM_SP, %_ASM_BP
+	.endif
+.endm
+
+.macro FP_RESTORE name
+	.if CONFIG_FRAME_POINTER
+		pop %_ASM_BP
+	.endif
+.endm
+
+#endif /* _ASM_X86_FUNC_H */
-- 
2.1.0

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