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|
; $Id: bs3-wc16-I8DQ.asm $
;; @file
; BS3Kit - 16-bit Watcom C/C++, 64-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"
BS3_EXTERN_CMN Bs3Int64Div
;;
; 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 $_?I8DQ
$_?I8DQ:
push es
push ss
pop es
%ifdef ASM_MODEL_FAR_CODE
push cs
%endif
call $_?I8DQE
pop es
%ifdef ASM_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 $_?I8DQE
$_?I8DQE:
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 dword [es:si + 4]
push dword [es:si]
; The dividend.
push ax
push bx
push cx
push dx
call Bs3Int64Div
; Load the quotient.
mov ax, [bp - 10h + 8 + 6]
mov bx, [bp - 10h + 8 + 4]
mov cx, [bp - 10h + 8 + 2]
mov dx, [bp - 10h + 8]
leave
pop es
pop ds
%ifdef ASM_MODEL_FAR_CODE
retf
%else
ret
%endif
|
