2008-01-26 22:57:46 +01:00
|
|
|
;*****************************************************************************
|
|
|
|
|
;*
|
|
|
|
|
;* 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: Connect/disconnect 80x87 interrupt handler.
|
|
|
|
|
;*
|
|
|
|
|
;*****************************************************************************
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
.8087
|
|
|
|
|
.386p
|
|
|
|
|
|
|
|
|
|
include struct.inc
|
|
|
|
|
include mdef.inc
|
|
|
|
|
|
|
|
|
|
xref __FPE2Handler_
|
|
|
|
|
|
|
|
|
|
modstart fpe387
|
|
|
|
|
|
|
|
|
|
datasegment
|
|
|
|
|
|
|
|
|
|
Save87 dd 0
|
2009-05-22 12:35:21 +02:00
|
|
|
OldMask dd 0
|
2008-01-26 22:57:46 +01:00
|
|
|
enddata
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
xdefp "C",__Init_FPE_handler
|
|
|
|
|
defp __Init_FPE_handler
|
|
|
|
|
_guess ; guess initialization required
|
|
|
|
|
cmp dword ptr Save87,0 ; - quit if already initialized
|
|
|
|
|
_quif ne ; - ...
|
|
|
|
|
_admit ; admit: already initialized
|
|
|
|
|
ret ; - return
|
|
|
|
|
_endguess ; endguess
|
|
|
|
|
push EAX ; save registers
|
|
|
|
|
push EBX ; ...
|
|
|
|
|
push ECX ; ...
|
2009-05-22 12:35:21 +02:00
|
|
|
push EDX ; ...
|
|
|
|
|
|
2008-01-26 22:57:46 +01:00
|
|
|
mov EAX, 68
|
|
|
|
|
mov EBX, 15
|
2009-05-22 12:35:21 +02:00
|
|
|
mov EDX, 10000h ; 1 shl 16 - #MF
|
2008-01-26 22:57:46 +01:00
|
|
|
lea ECX, __FPE2Handler_
|
2009-05-22 12:35:21 +02:00
|
|
|
int 40h ; set new exception handler
|
2008-01-26 22:57:46 +01:00
|
|
|
mov Save87, EAX ; save old handler
|
2009-05-22 12:35:21 +02:00
|
|
|
mov OldMask,EBX ; save old mask
|
2008-01-26 22:57:46 +01:00
|
|
|
|
2009-05-22 12:35:21 +02:00
|
|
|
pop EDX ; ...
|
2008-01-26 22:57:46 +01:00
|
|
|
pop ECX ; ...
|
|
|
|
|
pop EBX ; ...
|
|
|
|
|
pop EAX ; ...
|
|
|
|
|
ret ; return
|
|
|
|
|
endproc __Init_FPE_handler
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
xdefp "C",__Fini_FPE_handler
|
|
|
|
|
defp __Fini_FPE_handler
|
|
|
|
|
cmp dword ptr Save87,0 ; if not initialized
|
|
|
|
|
_if e ; - then
|
|
|
|
|
ret ; - return
|
|
|
|
|
_endif ; endif
|
|
|
|
|
push EAX ; save registers
|
|
|
|
|
push EBX ; ...
|
2009-05-22 12:35:21 +02:00
|
|
|
; ECX ????
|
2008-01-26 22:57:46 +01:00
|
|
|
push EDX ; ...
|
|
|
|
|
sub ESP,4 ; allocate space for control word
|
|
|
|
|
fstcw word ptr [ESP] ; get control word
|
|
|
|
|
fwait ; ...
|
|
|
|
|
mov byte ptr [ESP],7Fh ; disable exception interrupts
|
|
|
|
|
fldcw word ptr [ESP] ; ...
|
|
|
|
|
fwait ; ...
|
|
|
|
|
add ESP,4 ; remove temporary
|
|
|
|
|
|
|
|
|
|
mov EAX, 68
|
|
|
|
|
mov EBX, 15
|
2009-05-22 12:35:21 +02:00
|
|
|
mov ECX, dword ptr Save87 ; restore handler
|
|
|
|
|
mov EDX, dword ptr OldMask ; restore mask
|
|
|
|
|
int 40h ; set new ecxeption handler
|
|
|
|
|
|
2008-01-26 22:57:46 +01:00
|
|
|
pop EDX ; ...
|
2009-05-22 12:35:21 +02:00
|
|
|
; ECX ????
|
2008-01-26 22:57:46 +01:00
|
|
|
pop EBX ; ...
|
|
|
|
|
pop EAX ; ...
|
|
|
|
|
ret
|
|
|
|
|
endproc __Fini_FPE_handler
|
|
|
|
|
|
|
|
|
|
endmod
|
|
|
|
|
end
|
