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|
; $Id: bs3-wc16-U8DQ.asm $
;; @file
; BS3Kit - 16-bit Watcom C/C++, 64-bit unsigned integer division.
;
;
; Copyright (C) 2007-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE 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.
;
%include "bs3kit-template-header.mac"
BS3_EXTERN_CMN Bs3UInt64Div
;;
; 64-bit unsigned integer division, SS variant.
;
; @returns ax:bx:cx:dx quotient. (AX is the most significant, DX the least)
; @param ax:bx:cx:dx Dividend.
; @param [ss:si] Divisor
;
; @uses Nothing.
;
global $_?U8DQ
$_?U8DQ:
push es
push ss
pop es
%ifdef BS3_MODEL_FAR_CODE
push cs
%endif
call $_?U8DQE
pop es
%ifdef BS3_MODEL_FAR_CODE
retf
%else
ret
%endif
;;
; 64-bit unsigned integer division, ES variant.
;
; @returns ax:bx:cx:dx quotient. (AX is the most significant, DX the least)
; @param ax:bx:cx:dx Dividend.
; @param [es:si] Divisor
;
; @uses Nothing.
;
global $_?U8DQE
$_?U8DQE:
push ds
push es
;
; Convert to a C __cdecl call - not doing this in assembly.
;
; Set up a frame of sorts, allocating 16 bytes for the result buffer.
push bp
sub sp, 10h
mov bp, sp
; Pointer to the return buffer.
push ss
push bp
add bp, 10h ; Correct bp.
; The divisor.
push word [es:si + 6]
push word [es:si + 4]
push word [es:si + 2]
push word [es:si]
; The dividend.
push ax
push bx
push cx
push dx
call Bs3UInt64Div
; Load the quotient.
mov ax, [bp - 10h + 6]
mov bx, [bp - 10h + 4]
mov cx, [bp - 10h + 2]
mov dx, [bp - 10h]
mov sp, bp
pop bp
pop es
pop ds
%ifdef ASM_MODEL_FAR_CODE
retf
%else
ret
%endif
|
