linux-kernel - Re: [PATCH] Add asm-compat.h to x86

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Date:	Tue, 30 Oct 2007 18:27:47 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Glauber de Oliveira Costa <glommer@...il.com>
Subject: Re: [PATCH] Add asm-compat.h to x86

Mathieu Desnoyers wrote:
> Add asm-compat.h to x86
>
> In assembly code and in gcc inline assembly, we need .long to express a "c long"
> type on i386 and a .quad to express the same on x86_64. Use macros similar to
> powerpc "PPC_LONG" to express those. Name chosen: ASM_LONG. (didn't feel like
> X86_LONG was required).
>
> This is useful in inline assembly within code shared between 32 and 64
> bits architectures in x86.
>
> More compatible assembly macros could be added in this header later when
> needed.
>
> I had to create this to implement a merged optimized immediate values
> header for x86.
>   

Seems sound to me, and this header might be a useful place to put other
things, like macros to emit exceptions, etc...

    J
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> CC: Thomas Gleixner <tglx@...utronix.de>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: "H. Peter Anvin" <hpa@...or.com>
> ---
>  include/asm-x86/asm-compat.h |   29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>
> Index: linux-2.6-lttng/include/asm-x86/asm-compat.h
> ===================================================================
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6-lttng/include/asm-x86/asm-compat.h	2007-10-24 09:41:09.000000000 -0400
> @@ -0,0 +1,29 @@
> +#ifndef _ASM_X86_ASM_COMPAT_H
> +#define _ASM_X86_ASM_COMPAT_H
> +
> +#include <asm/types.h>
> +
> +#ifdef __ASSEMBLY__
> +#  define stringify_in_c(...)	__VA_ARGS__
> +#  define ASM_CONST(x)		x
> +#else
> +/* This version of stringify will deal with commas... */
> +#  define __stringify_in_c(...)	#__VA_ARGS__
> +#  define stringify_in_c(...)	__stringify_in_c(__VA_ARGS__) " "
> +#  define __ASM_CONST(x)	x##UL
> +#  define ASM_CONST(x)		__ASM_CONST(x)
> +#endif
> +
> +#ifdef CONFIG_X86_64
> +
> +/* operations for longs and pointers */
> +#define ASM_LONG	stringify_in_c(.quad)
> +
> +#else /* 32-bit */
> +
> +/* operations for longs and pointers */
> +#define ASM_LONG	stringify_in_c(.long)
> +
> +#endif
> +
> +#endif /* _ASM_X86_ASM_COMPAT_H */
>
>   

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