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

Josh Poimboeuf
2015-06-10T12:09:43Z

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@redhat.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