linux-kernel - Re: [PATCH v5 01/10] x86/asm: Add FP

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Message-ID: <20150610182429.GA29482@treble.redhat.com>
Date:	Wed, 10 Jun 2015 13:24:29 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, 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: Re: [PATCH v5 01/10] x86/asm: Add FP_SAVE/RESTORE frame pointer
 macros

On Wed, Jun 10, 2015 at 08:17:32PM +0200, Pavel Machek wrote:
> On Wed 2015-06-10 07:06:09, Josh Poimboeuf wrote:
> > Add the FP_SAVE and FP_RESTORE asm macros, which can be used to save and
> > restore the frame pointer.
> 
> Add a changelog, which can be used to tell what changed.

Fair enough :-)

> > 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
> 
> Hmm. This will not compile when included into .c file. Should it have
> other extension than .h? (Or can the macros be done in different way?

These are gnu assembler macros.  This file is only included by .S files.

-- 
Josh
--
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