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|
; $Id: bs3-wc16-U4D.asm $
;; @file
; BS3Kit - 16-bit Watcom C/C++, 32-bit unsigned integer division.
;
;
; Copyright (C) 2007-2023 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
%include "bs3kit-template-header.mac"
;;
; 32-bit unsigned integer division.
;
; @returns DX:AX quotient, CX:BX remainder.
; @param DX:AX Dividend.
; @param CX:BX Divisor
;
; @uses Nothing.
;
%ifdef BS3KIT_WITH_REAL_WATCOM_INTRINSIC_NAMES
global __U4D
__U4D:
%endif
global $_?U4D
$_?U4D:
%if TMPL_BITS >= 32
; Move dividend into EDX:EAX
shl eax, 10h
mov ax, dx
xor edx, edx
; Move divisor into ebx.
shl ebx, 10h
mov bx, cx
; Do it!
div ebx
; Reminder in to CX:BX
mov bx, dx
shr edx, 10h
mov cx, dx
; Quotient into DX:AX
mov edx, eax
shr edx, 10h
%else
push ds
push es
;
; Convert to a C __cdecl call - too lazy to do this in assembly.
;
; Set up a frame of sorts, allocating 8 bytes for the result buffer.
push bp
sub sp, 08h
mov bp, sp
; Pointer to the return buffer.
push ss
push bp
add bp, 08h ; Correct bp.
; The divisor.
push cx
push bx
; The dividend.
push dx
push ax
BS3_EXTERN_CMN Bs3UInt32Div
call Bs3UInt32Div
; Load the reminder.
mov cx, [bp - 08h + 6]
mov bx, [bp - 08h + 4]
; Load the quotient.
mov dx, [bp - 08h + 2]
mov ax, [bp - 08h]
mov sp, bp
pop bp
pop es
pop ds
%endif
%ifdef ASM_MODEL_FAR_CODE
retf
%else
ret
%endif
|
