mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-16 03:42:35 +03:00
192 lines
6.5 KiB
C
192 lines
6.5 KiB
C
/****************************************************************************
|
|
*
|
|
* Open Watcom Project
|
|
*
|
|
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* This file contains Original Code and/or Modifications of Original
|
|
* Code as defined in and that are subject to the Sybase Open Watcom
|
|
* Public License version 1.0 (the 'License'). You may not use this file
|
|
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
|
|
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
|
|
* provided with the Original Code and Modifications, and is also
|
|
* available at www.sybase.com/developer/opensource.
|
|
*
|
|
* The Original Code and all software distributed under the License are
|
|
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
|
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
|
|
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
|
|
* NON-INFRINGEMENT. Please see the License for the specific language
|
|
* governing rights and limitations under the License.
|
|
*
|
|
* ========================================================================
|
|
*
|
|
* Description: __chk8087 and other FPU related functions.
|
|
*
|
|
****************************************************************************/
|
|
|
|
|
|
#include "variety.h"
|
|
#include <stdlib.h>
|
|
#include <float.h>
|
|
#if defined( __OS2__ )
|
|
#endif
|
|
#if defined( __WINDOWS__ )
|
|
#include <i86.h>
|
|
#endif
|
|
|
|
#include "rtdata.h"
|
|
#include "exitwmsg.h"
|
|
#include "87state.h"
|
|
|
|
extern void __GrabFP87( void );
|
|
|
|
extern unsigned short __8087cw;
|
|
#pragma aux __8087cw "*";
|
|
|
|
#if defined( __DOS_086__ )
|
|
extern unsigned char __dos87real;
|
|
#pragma aux __dos87real "*";
|
|
|
|
extern unsigned short __dos87emucall;
|
|
#pragma aux __dos87emucall "*";
|
|
#endif
|
|
|
|
extern void __init_80x87( void );
|
|
#if defined( __DOS_086__ )
|
|
#pragma aux __init_80x87 "*" = \
|
|
".8087" \
|
|
"cmp __dos87real,0" \
|
|
"jz l1" \
|
|
"finit" \
|
|
"fldcw __8087cw" \
|
|
"l1: cmp __dos87emucall,0" \
|
|
"jz l2" \
|
|
"mov ax,1" \
|
|
"call __dos87emucall" \
|
|
"l2:" ;
|
|
#else
|
|
#pragma aux __init_80x87 "*" = \
|
|
".8087" \
|
|
"finit" \
|
|
"fldcw __8087cw" ;
|
|
#endif
|
|
|
|
/* 0 => no 8087; 2 => 8087,287; 3=>387 */
|
|
extern unsigned char _WCI86NEAR __x87id( void );
|
|
#pragma aux __x87id "*";
|
|
|
|
#if !defined( __UNIX__ ) && !defined( __OS2_386__ )
|
|
|
|
extern void __fsave( _87state * );
|
|
extern void __frstor( _87state * );
|
|
|
|
#if defined( __386__ )
|
|
|
|
#pragma aux __fsave = \
|
|
0x9b 0xdd 0x30 /* fsave [eax] ; save the 8087 state */ \
|
|
0x9b /* wait */ \
|
|
parm routine [eax];
|
|
|
|
#pragma aux __frstor = \
|
|
0xdd 0x20 /* frstor [eax] ; restore the 8087 */ \
|
|
0x9b /* wait ; wait */ \
|
|
parm routine [eax];
|
|
|
|
#else /* __286__ */
|
|
|
|
#if defined( __BIG_DATA__ )
|
|
#pragma aux __fsave = \
|
|
0x53 /* push bx */ \
|
|
0x1e /* push ds */ \
|
|
0x8e 0xda /* mov ds,dx */ \
|
|
0x8b 0xd8 /* mov bx,ax */ \
|
|
0x9b 0xdd 0x37 /* fsave [bx] */ \
|
|
0x90 0x9b /* fwait */ \
|
|
0x1f /* pop ds */ \
|
|
0x5b /* pop bx */ \
|
|
parm routine [dx ax];
|
|
#else
|
|
#pragma aux __fsave = \
|
|
0x53 /* push bx */ \
|
|
0x8b 0xd8 /* mov bx,ax */ \
|
|
0x9b 0xdd 0x37 /* fsave [bx] */ \
|
|
0x90 0x9b /* fwait */ \
|
|
0x5b /* pop bx */ \
|
|
parm routine [ax];
|
|
#endif
|
|
|
|
#if defined( __BIG_DATA__ )
|
|
#pragma aux __frstor = \
|
|
0x53 /* push bx */ \
|
|
0x1e /* push ds */ \
|
|
0x8e 0xda /* mov ds,dx */ \
|
|
0x8b 0xd8 /* mov bx,ax */ \
|
|
0x9b 0xdd 0x27 /* frstor [bx] */ \
|
|
0x90 0x9b /* fwait */ \
|
|
0x1f /* pop ds */ \
|
|
0x5b /* pop bx */ \
|
|
parm routine [dx ax];
|
|
#else
|
|
#pragma aux __frstor = \
|
|
0x53 /* push bx */ \
|
|
0x8b 0xd8 /* mov bx,ax */ \
|
|
0x9b 0xdd 0x27 /* frstor [bx] */ \
|
|
0x90 0x9b /* fwait */ \
|
|
0x5b /* pop bx */ \
|
|
parm routine [ax];
|
|
#endif
|
|
|
|
#endif
|
|
|
|
static void __save_8087( _87state * __fs )
|
|
{
|
|
__fsave( __fs );
|
|
}
|
|
|
|
static void __rest_8087( _87state * __fs )
|
|
{
|
|
__frstor( __fs );
|
|
}
|
|
#endif /* !__UNIX__ && && !__OS2__ */
|
|
|
|
_WCRTLINK void _fpreset( void )
|
|
{
|
|
if( _RWD_8087 != 0 ) {
|
|
__init_80x87();
|
|
}
|
|
}
|
|
|
|
void __init_8087( void )
|
|
{
|
|
#if !defined( __UNIX__ ) && !defined( __OS2_386__ )
|
|
if( _RWD_real87 != 0 )
|
|
{ /* if our emulator, don't worry */
|
|
_RWD_Save8087 = __save_8087; /* point to real save 8087 routine */
|
|
_RWD_Rest8087 = __rest_8087; /* point to real restore 8087 routine */
|
|
}
|
|
#endif
|
|
_fpreset();
|
|
}
|
|
|
|
#if defined( __DOS__ ) || defined( __OS2_286__ )
|
|
|
|
void _WCI86FAR __default_sigfpe_handler( int fpe_sig )
|
|
{
|
|
__fatal_runtime_error( "Floating point exception\r\n", EXIT_FAILURE );
|
|
}
|
|
#endif
|
|
|
|
void __chk8087( void )
|
|
/********************/
|
|
{
|
|
_RWD_real87 = __x87id();
|
|
_RWD_8087 = _RWD_real87;
|
|
__init_8087();
|
|
__GrabFP87();
|
|
}
|
|
|