lkml.org 
[lkml]   [2016]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/asm] x86/asm: Add C versions of frame pointer macros
Commit-ID:  ec5186557abbe711dfd34e1863735dfecb0602cc
Gitweb: http://git.kernel.org/tip/ec5186557abbe711dfd34e1863735dfecb0602cc
Author: Josh Poimboeuf <jpoimboe@redhat.com>
AuthorDate: Fri, 18 Dec 2015 06:39:19 -0600
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 19 Jan 2016 12:59:07 +0100

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>
---
arch/x86/include/asm/frame.h | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)

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 */
\
 
 \ /
  Last update: 2016-01-19 15:21    [W:0.321 / U:1.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site