[patch 4/8] Add asm-compat.h to x86

Mathieu Desnoyers
2007-11-13T19:02:44Z

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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.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@elte.hu>
CC: "H. Peter Anvin" <hpa@zytor.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 2007-11-01 22:43:09.000000000 -0400
@@ -0,0 +1,29 @@
+#ifndef _ASM_X86_ASM_COMPAT_H
+#define _ASM_X86_ASM_COMPAT_H
+
+#include <linux/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 */