/****************************************************************************
*
* 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
#if defined( __OS2__ )
void __chk8087( void )
/********************/
{
char devinfo;
#if defined( __386__ )
DosDevConfig( &devinfo, DEVINFO_COPROCESSOR );
if( devinfo == 0 ) {
_RWD_real87 = 0;
} else {
_RWD_real87 = __x87id();
}
_RWD_8087 = _RWD_real87;
#else
if( _RWD_8087 == 0 ) {
DosDevConfig( &devinfo, 3, 0 );
if( devinfo == 0 ) {
_RWD_real87 = 0;
} else {
_RWD_real87 = __x87id();
}
_RWD_8087 = _RWD_real87;
}
if( _RWD_real87 ) {
__GrabFP87();
}
if( _RWD_8087 ) {
_RWD_FPE_handler = __default_sigfpe_handler;
}
#endif
_fpreset();
}
#elif defined( __QNX__ )
void __chk8087( void )
/********************/
{
extern char __87;
extern char __r87;
_RWD_real87 = __r87;
_RWD_8087 = __87;
_fpreset();
}
#elif defined( __LINUX__ )
void __chk8087( void )
/********************/
{
// TODO: We really need to call Linux and determine if the machine
// has a real FPU or not, so we can properly work with an FPU
// emulator.
_RWD_real87 = __x87id();
_RWD_8087 = _RWD_real87;
_fpreset();
}
#elif defined( __NETWARE__ )
extern short __87present( void );
#pragma aux __87present = \
"smsw ax ", \
"test ax, 4 ", \
"jne no_emu ", \
"xor ax, ax ", \
"no_emu: ", \
"mov ax, 1 " \
value [ ax ];
extern void __chk8087( void )
/*****************************/
{
if( _RWD_8087 == 0 ) {
if( __87present() ) {
_RWD_8087 = 3; /* 387 */
_RWD_real87 = 3;
}
__init_80x87();
}
}
#elif defined( __NT__ )
void __chk8087( void )
/********************/
{
_RWD_real87 = 3; //387+ ; //__x87id();
_RWD_8087 = _RWD_real87;
__init_8087();
}
#elif defined( __DOS__ )
void __chk8087( void )
/********************/
{
if( _RWD_8087 != 0 ) { /* if we already know we have an 80x87 */
#if !defined( __386__ )
if( __dos87real )
__GrabFP87();
#endif
_RWD_FPE_handler = __default_sigfpe_handler;
return; /* this prevents real87 from being set */
} /* when we have an emulator */
_RWD_real87 = __x87id(); /* if a coprocessor is present then we */
_RWD_8087 = _RWD_real87; /* initialize even when NO87 is defined */
#if !defined( __386__ )
__dos87real = _RWD_real87;
#endif
__init_8087(); /* this handles the fpi87 and NO87 case */
if( _RWD_no87 != 0 ) { /* if NO87 environment var is defined */
_RWD_8087 = 0; /* then we want to pretend that the */
_RWD_real87 = 0; /* coprocessor doesn't exist */
}
if( _RWD_real87 ) {
__GrabFP87();
}
if( _RWD_8087 ) {
_RWD_FPE_handler = __default_sigfpe_handler;
}
}
#elif defined( __WINDOWS__ )
void __chk8087( void )
/********************/
{
if( _RWD_8087 != 0 ) /* if we already know we have an 80x87 */
return; /* this prevents real87 from being set */
/* when we have an emulator */
if( GetWinFlags() & WF_80x87 ) { /* if a coprocessor is present then we */
#if defined( __386__ )
extern void pascal _FloatingPoint( void );
_FloatingPoint();
#endif
_RWD_real87 = __x87id(); /* initialize even when NO87 is defined */
_RWD_8087 = _RWD_real87; /* this handles the fpi87 and NO87 case */
__init_8087();
} else {
#if defined( __386__ )
// check to see if emulator is loaded
union REGS regs;
regs.w.ax = 0xfa00;
int86( 0x2f, ®s, ®s );
if( regs.w.ax == 0x0666 ) { /* check for emulator present */
_RWD_real87 = __x87id(); /* initialize even when NO87 is defined */
_RWD_8087 = _RWD_real87; /* this handles the fpi87 and NO87 case */
__init_8087();
}
#endif
}
if( _RWD_no87 != 0 ) { /* if NO87 environment var is defined */
_RWD_8087 = 0; /* then we want to pretend that the */
_RWD_real87 = 0; /* coprocessor doesn't exist */
}
}
#endif