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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/