common.h

kaffe Java 解释器语言,源码,Java的子集系统,开放源代码

/*
 * arm/common.h
 * Common arm configuration information.
 *
 * Copyright (c) 1996, 1997
 *	Transvirtual Technologies, Inc.  All rights reserved.
 *
 * Copyright (c) 2003
 *      Kaffe.org contributors. See ChangeLog for details.
 *
 * See the file "license.terms" for information on usage and redistribution 
 * of this file. 
 *
 * Written by Godmar Back <[e-mail]>
 */

#ifndef __arm_common_h
#define __arm_common_h

/* The arm never aligns to more than a 4 byte boundary. */
#define	ALIGNMENT_OF_SIZE(S)	((S) < 4 ? (S) : 4)

/*
 * Do an atomic exchange.  The contents of address 'A' is exchanged
 * with value 'N'.
 */
#define ATOMIC_EXCHANGE(A,N) \
	asm volatile("swp       %0, %0, [%2]" : "=r" (N) : "0" (N), "r" (A) : "cc", "memory" );

#endif