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