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Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U8DR.asm')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U8DR.asm | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U8DR.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U8DR.asm new file mode 100644 index 00000000..18381119 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-wc16-U8DR.asm @@ -0,0 +1,124 @@ +; $Id: bs3-wc16-U8DR.asm $ +;; @file +; BS3Kit - 16-bit Watcom C/C++, 64-bit unsigned integer modulo. +; + +; +; 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 Bs3UInt64Div + + +;; +; 64-bit unsigned integer modulo, SS variant. +; +; @returns ax:bx:cx:dx reminder. (AX is the most significant, DX the least) +; @param ax:bx:cx:dx Dividend. +; @param [ss:si] Divisor +; +; @uses Nothing. +; +global $_?U8DR +$_?U8DR: + push es + push ss + pop es +%ifdef ASM_MODEL_FAR_CODE + push cs +%endif + call $_?U8DRE + pop es +%ifdef ASM_MODEL_FAR_CODE + retf +%else + ret +%endif + +;; +; 64-bit unsigned integer modulo, ES variant. +; +; @returns ax:bx:cx:dx reminder. (AX is the most significant, DX the least) +; @param ax:bx:cx:dx Dividend. +; @param [es:si] Divisor +; +; @uses Nothing. +; +global $_?U8DRE +$_?U8DRE: + 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 reminder. + mov ax, [bp - 10h + 8 + 6] + mov bx, [bp - 10h + 8 + 4] + mov cx, [bp - 10h + 8 + 2] + mov dx, [bp - 10h + 8] + + mov sp, bp + pop bp + pop es + pop ds +%ifdef ASM_MODEL_FAR_CODE + retf +%else + ret +%endif + |