150 lines
4.8 KiB
C
150 lines
4.8 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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* DESCRIBE IT HERE!
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*
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****************************************************************************/
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#include "variety.h"
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#include <math.h>
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#include <float.h>
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#include "rtdata.h"
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extern void __fstcw();
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extern void __fldcw();
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#if defined(__WINDOWS__) && !defined(__WINDOWS_386__)
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extern void __far _fpmath();
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#pragma aux _fpmath "__fpmath";
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void __win87em_fldcw(unsigned int);
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#pragma aux __win87em_fldcw = \
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"push bx" \
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"mov bx, 4h" \
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"call far ptr _fpmath" \
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"pop bx" \
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parm [ax]
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unsigned int __win87em_fstcw(void);
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#pragma aux __win87em_fstcw = \
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"push bx" \
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"mov bx, 5h" \
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"call far ptr _fpmath" \
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"pop bx" \
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value [ax]
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#elif defined( __DOS_086__ )
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extern unsigned char __dos87real;
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#pragma aux __dos87real "*";
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extern unsigned short __dos87emucall;
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#pragma aux __dos87emucall "*";
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void _WCI86NEAR __dos_emu_fldcw( unsigned short * );
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#pragma aux __dos_emu_fldcw "*" = \
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"mov ax,3" \
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"call __dos87emucall" \
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parm [bx];
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void _WCI86NEAR __dos_emu_fstcw( unsigned short * );
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#pragma aux __dos_emu_fstcw "*" = \
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"mov ax,4" \
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"call __dos87emucall" \
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parm [bx];
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#endif
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#if defined(__386__)
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#pragma aux __fstcw = \
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"fstcw ss:[edi]" \
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"fwait" \
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parm caller [edi];
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#pragma aux __fldcw = \
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"fldcw ss:[edi]" \
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parm caller [edi];
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#else
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#pragma aux __fstcw = \
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"xchg ax,bp" \
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"fstcw [bp]" \
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"fwait" \
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"xchg ax,bp" \
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parm caller [ax];
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#pragma aux __fldcw = \
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"xchg ax,bp" \
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"fldcw [bp]" \
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"xchg ax,bp" \
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parm caller [ax];
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#endif
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_WCRTLINK unsigned _control87( unsigned new, unsigned mask )
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/**********************************************************/
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{
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auto short unsigned int control_word;
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control_word = 0;
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if( _RWD_8087 ) {
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#if defined(__WINDOWS__) && !defined(__WINDOWS_386__)
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__fstcw( &control_word );
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control_word = __win87em_fstcw();
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if( mask != 0 ) {
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control_word = (control_word & ~mask) | (new & mask);
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__fldcw( &control_word );
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__fstcw( &control_word ); /* 17-sep-91 */
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__win87em_fldcw(control_word);
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}
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#elif defined( __DOS_086__ )
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if( __dos87real ) {
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__fstcw( &control_word );
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if( mask != 0 ) {
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control_word = (control_word & ~mask) | (new & mask);
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__fldcw( &control_word );
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__fstcw( &control_word );
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}
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}
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if( __dos87emucall ) {
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__dos_emu_fstcw( &control_word );
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if( mask != 0 ) {
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control_word = (control_word & ~mask) | (new & mask);
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__dos_emu_fldcw( &control_word );
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__dos_emu_fstcw( &control_word );
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}
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}
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#else
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__fstcw( &control_word );
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if( mask != 0 ) {
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control_word = (control_word & ~mask) | (new & mask);
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__fldcw( &control_word );
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__fstcw( &control_word ); /* 17-sep-91 */
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}
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#endif
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}
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return( control_word );
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}
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