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@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Chris J Arges <chris.j.arges@canonical.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Pedro Alves <palves@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/f6786a282bf232ede3e2866414eae3cf02c7d662.1450442274.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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 */