Commit ec518655 authored Dec 18, 2015 by Josh Poimboeuf Committed by Ingo Molnar Jan 19, 2016

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>

parent 997963ed

arch/x86/include/asm/frame.h

+13 −3

Original line number	Diff line number	Diff line
		#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 */