107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
/*
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* status_w.h
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*
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*
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* Copyright (C) 1992,1993,1994
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* W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
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* Australia. E-mail billm@vaxc.cc.monash.edu.au
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* All rights reserved.
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*
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* This copyright notice covers the redistribution and use of the
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* FPU emulator developed by W. Metzenthen. It covers only its use
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* in the 386BSD, FreeBSD and NetBSD operating systems. Any other
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* use is not permitted under this copyright.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must include information specifying
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* that source code for the emulator is freely available and include
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* either:
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* a) an offer to provide the source code for a nominal distribution
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* fee, or
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* b) list at least two alternative methods whereby the source
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* can be obtained, e.g. a publically accessible bulletin board
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* and an anonymous ftp site from which the software can be
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* downloaded.
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* 3. All advertising materials specifically mentioning features or use of
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* this emulator must acknowledge that it was developed by W. Metzenthen.
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* 4. The name of W. Metzenthen may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* The purpose of this copyright, based upon the Berkeley copyright, is to
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* ensure that the covered software remains freely available to everyone.
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*
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* The software (with necessary differences) is also available, but under
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* the terms of the GNU copyleft, for the Linux operating system and for
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* the djgpp ms-dos extender.
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*
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* W. Metzenthen June 1994.
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*
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*
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* $FreeBSD$
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*
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*/
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#ifndef _STATUS_H_
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#define _STATUS_H_
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#ifdef LOCORE
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#define Const__(x) $/**/x
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#else
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#define Const__(x) x
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#endif
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#define SW_Backward Const__(0x8000) /* backward compatibility */
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#define SW_C3 Const__(0x4000) /* condition bit 3 */
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#define SW_Top Const__(0x3800) /* top of stack */
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#define SW_Top_Shift Const__(11) /* shift for top of stack bits */
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#define SW_C2 Const__(0x0400) /* condition bit 2 */
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#define SW_C1 Const__(0x0200) /* condition bit 1 */
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#define SW_C0 Const__(0x0100) /* condition bit 0 */
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#define SW_Summary Const__(0x0080) /* exception summary */
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#define SW_Stack_Fault Const__(0x0040) /* stack fault */
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#define SW_Precision Const__(0x0020) /* loss of precision */
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#define SW_Underflow Const__(0x0010) /* underflow */
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#define SW_Overflow Const__(0x0008) /* overflow */
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#define SW_Zero_Div Const__(0x0004) /* divide by zero */
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#define SW_Denorm_Op Const__(0x0002) /* denormalized operand */
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#define SW_Invalid Const__(0x0001) /* invalid operation */
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#define SW_Exc_Mask Const__(0x27f) /* Status word exception bit mask */
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#ifndef LOCORE
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#define COMP_A_gt_B 1
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#define COMP_A_eq_B 2
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#define COMP_A_lt_B 3
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#define COMP_No_Comp 4
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#define COMP_Denormal 0x20
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#define COMP_NaN 0x40
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#define COMP_SNaN 0x80
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#define setcc(cc) ({ \
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status_word &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
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status_word |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); })
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#endif /* LOCORE */
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#endif /* _STATUS_H_ */
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