linux-kernel - Re: [PATCH] x86: make asm/asm.h work for asm code.

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Date:	Mon, 16 Jun 2008 16:08:17 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...nel.org>
CC:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: make asm/asm.h work for asm code.

H. Peter Anvin wrote:
> Jeremy Fitzhardinge wrote:
>> This is useful for unifying some pieces of asm code.
>>
>> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
>
> Thinking about it some more, this should be possible to do cleaner 
> like this:

OK, how about this...

    J

Subject: x86: make asm/asm.h work for asm code.

This is useful for unifying some pieces of asm code.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 include/asm-x86/asm.h |   42 +++++++++++++++++++-----------------------
 1 file changed, 19 insertions(+), 23 deletions(-)

===================================================================
--- a/include/asm-x86/asm.h
+++ b/include/asm-x86/asm.h
@@ -1,33 +1,29 @@
 #ifndef _ASM_X86_ASM_H
 #define _ASM_X86_ASM_H
 
+#ifdef __ASSEMBLY__
+# define __ASM_FORM(x)	x
+#else
+# define __ASM_FORM(x)	" " #x " "
+#endif
+
 #ifdef CONFIG_X86_32
-/* 32 bits */
+# define __ASM_SEL(a,b) __ASM_FORM(a)
+#else
+# define __ASM_SEL(a,b) __ASM_FORM(b)
+#endif
 
-# define _ASM_PTR	" .long "
-# define _ASM_ALIGN	" .balign 4 "
-# define _ASM_MOV_UL	" movl "
+#define __ASM_SIZE(inst)	__ASM_SEL(inst##l, inst##q)
 
-# define _ASM_INC	" incl "
-# define _ASM_DEC	" decl "
-# define _ASM_ADD	" addl "
-# define _ASM_SUB	" subl "
-# define _ASM_XADD	" xaddl "
+#define _ASM_PTR	__ASM_SEL(.long, .quad)
+#define _ASM_ALIGN	__ASM_SEL(.balign 4, .balign 8)
+#define _ASM_MOV_UL	__ASM_SIZE(mov)
 
-#else
-/* 64 bits */
-
-# define _ASM_PTR	" .quad "
-# define _ASM_ALIGN	" .balign 8 "
-# define _ASM_MOV_UL	" movq "
-
-# define _ASM_INC	" incq "
-# define _ASM_DEC	" decq "
-# define _ASM_ADD	" addq "
-# define _ASM_SUB	" subq "
-# define _ASM_XADD	" xaddq "
-
-#endif /* CONFIG_X86_32 */
+#define _ASM_INC	__ASM_SIZE(inc)
+#define _ASM_DEC	__ASM_SIZE(dec)
+#define _ASM_ADD	__ASM_SIZE(add)
+#define _ASM_SUB	__ASM_SIZE(sub)
+#define _ASM_XADD	__ASM_SIZE(xadd)
 
 /* Exception table entry */
 # define _ASM_EXTABLE(from,to) \


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