fe51b7a036
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@326 6ac86273-5f31-0410-b378-82cca8765d1b
66 lines
1.5 KiB
NASM
66 lines
1.5 KiB
NASM
; File:
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; rtlsupt.asm
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; Description:
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; Assembly support routines for long mul/div
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; was forced to do that for WATCOM C, which has _near
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; LMUL/LDIV routines. shouldn't harm for others
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;
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; Copyright (c) 2001
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; tom ehlert
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; All Rights Reserved
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;
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; This file is part of DOS-C.
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;
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; DOS-C is free software; you can redistribute it and/or
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; modify it under the terms of the GNU General Public License
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; as published by the Free Software Foundation; either version
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; 2, or (at your option) any later version.
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;
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; DOS-C is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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; the GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public
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; License along with DOS-C; see the file COPYING. If not,
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; write to the Free Software Foundation, 675 Mass Ave,
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; Cambridge, MA 02139, USA.
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;
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; $Id$
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;
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;
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%include "segs.inc"
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segment _TEXT
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;
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; cdecl calling conventions
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;
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; ULONG FAR MULULUS(ULONG mul1, USHORT mul2) - MULtiply ULong by UShort
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;
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%IFNDEF I386
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P8086
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%ELSE
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P386 ; Turn on 386 instructions.
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%ENDIF ; I386
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global _MULULUS
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_MULULUS:
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push bp
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mov bp,sp
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mov bx,[bp+6+4] ; short mul2
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mov ax,[bp+6+2] ; high part of mul1
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mul bx
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mov cx,ax
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mov ax,[bp+6+0] ; low part of mul1
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mul bx
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add dx,cx ; add in high part of result
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pop bp
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retf
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