kolibrios/programs/develop/open watcom/trunk/clib/cgsupp/fstat386.asm

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;*****************************************************************************
;*
;* 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: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
;* DESCRIBE IT HERE!
;*
;*****************************************************************************
; of AX:DX
;
include mdef.inc
include struct.inc
include fstatus.inc
modstart fstat386
xref "C",__set_ERANGE
xref __FPE_exception_
datasegment
enddata
assume ss:nothing
FPS_OK = 0
FPS_UNDERFLOW = 1
FPS_OVERFLOW = 2
FPS_DIVIDE_BY_0 = 3
FPS_BAD_ARG = 4
jmps macro dsym
jmp short dsym
endm
xdefp F8UnderFlow
xdefp F4UnderFlow
xdefp F8InvalidOp
xdefp F8DivZero
xdefp F4DivZero
xdefp F8OverFlow
xdefp F4OverFlow
xdefp F8RetInf_
xdefp _F8RetInf_
defpe F8UnderFlow
sub EDX,EDX ; . . .
defpe F4UnderFlow
;; mov EAX,FPE_UNDERFLOW; indicate underflow
;; call __FPE_exception_;
sub EAX,EAX ; return a zero
ret ; return
endproc F4UnderFlow
endproc F8UnderFlow
defpe F8InvalidOp
mov EAX,FPE_ZERODIVIDE; indicate divide by 0
call __FPE_exception_;
jmps F8RetInf9 ; return infinity
endproc F8InvalidOp
defpe F8DivZero
mov EAX,FPE_ZERODIVIDE; indicate divide by 0
call __FPE_exception_;
jmps F8RetInf9 ; return infinity
endproc F8DivZero
defpe F8OverFlow
;
; F8RetInf( sign : int ) : reallong
;
defpe F8RetInf_
defpe _F8RetInf_
push EAX ; save sign of result
call __set_ERANGE ; errno = ERANGE
mov EAX,FPE_OVERFLOW ; indicate overflow
call __FPE_exception_;
pop EAX ; restore sign of result
F8RetInf9: and EAX,80000000h ; get sign
or EAX,7FF00000h ; set infinity
mov EDX,EAX ;
sub EAX,EAX ; ...
ret ; return
endproc _F8RetInf_
endproc F8RetInf_
endproc F8OverFlow
defpe F4DivZero
mov EAX,FPE_ZERODIVIDE; indicate divide by 0
call __FPE_exception_;
jmps F4RetInf9 ; return infinity
endproc F4DivZero
defpe F4OverFlow
defp F4RetInf ; return infinity
push EAX ; save sign of result
call __set_ERANGE ; errno = ERANGE
mov EAX,FPE_OVERFLOW ; indicate overflow
call __FPE_exception_;
pop EAX ; restore sign of result
F4RetInf9: and EAX,80000000h ; get sign
or EAX,7F800000h
ret
endproc F4RetInf
endproc F4OverFlow
endmod
end