exception.h

freebsd v4.4内核源码

/*
 *  exception.h
 *
 *
 * Copyright (C) 1992,1993,1994
 *                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
 *                       Australia.  E-mail   [e-mail]
 * All rights reserved.
 *
 * This copyright notice covers the redistribution and use of the
 * FPU emulator developed by W. Metzenthen. It covers only its use
 * in the 386BSD, FreeBSD and NetBSD operating systems. Any other
 * use is not permitted under this copyright.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must include information specifying
 *    that source code for the emulator is freely available and include
 *    either:
 *      a) an offer to provide the source code for a nominal distribution
 *         fee, or
 *      b) list at least two alternative methods whereby the source
 *         can be obtained, e.g. a publically accessible bulletin board
 *         and an anonymous ftp site from which the software can be
 *         downloaded.
 * 3. All advertising materials specifically mentioning features or use of
 *    this emulator must acknowledge that it was developed by W. Metzenthen.
 * 4. The name of W. Metzenthen may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * The purpose of this copyright, based upon the Berkeley copyright, is to
 * ensure that the covered software remains freely available to everyone.
 *
 * The software (with necessary differences) is also available, but under
 * the terms of the GNU copyleft, for the Linux operating system and for
 * the djgpp ms-dos extender.
 *
 * W. Metzenthen   June 1994.
 *
 *
 * $FreeBSD: src/sys/gnu/i386/fpemul/exception.h,v 1.5.2.1 1999/09/05 08:09:35 peter Exp $
 *
 *
 */

#ifndef _EXCEPTION_H_
#define _EXCEPTION_H_


#ifdef LOCORE
#define	Const_(x)	$/**/x
#else
#define	Const_(x)	x
#endif

#ifndef SW_C1
#include <gnu/i386/fpemul/fpu_emu.h>
#endif				/* SW_C1 */

#define FPU_BUSY        Const_(0x8000)	/* FPU busy bit (8087 compatibility) */
#define EX_ErrorSummary Const_(0x0080)	/* Error summary status */
/* Special exceptions: */
#define	EX_INTERNAL	Const_(0x8000)	/* Internal error in wm-FPU-emu */
#define EX_StackOver	Const_(0x0041|SW_C1)	/* stack overflow */
#define EX_StackUnder	Const_(0x0041)	/* stack underflow */
/* Exception flags: */
#define EX_Precision	Const_(0x0020)	/* loss of precision */
#define EX_Underflow	Const_(0x0010)	/* underflow */
#define EX_Overflow	Const_(0x0008)	/* overflow */
#define EX_ZeroDiv	Const_(0x0004)	/* divide by zero */
#define EX_Denormal	Const_(0x0002)	/* denormalized operand */
#define EX_Invalid	Const_(0x0001)	/* invalid operation */


#ifndef LOCORE

#ifdef DEBUG
#include <sys/param.h>
#include <sys/systm.h>

#define	EXCEPTION(x)							    \
	do {								    \
		printf("exception in %s at line %d\n", __FILE__, __LINE__); \
		exception(x);						    \
	} while (0)
#else
#define	EXCEPTION(x)	exception(x)
#endif

#endif				/* LOCORE */

#endif				/* _EXCEPTION_H_ */