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|
; $Id: __I4D.asm $
;; @file
; Compiler support routines.
;
;
; Copyright (C) 2012-2019 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.
;
;*******************************************************************************
;* Exported Symbols *
;*******************************************************************************
public __I4D
if VBOX_BIOS_CPU lt 80386
extrn NeedToImplementOn8086__I4D:near
endif
.8086
_TEXT segment public 'CODE' use16
assume cs:_TEXT
;;
; 32-bit signed division.
;
; @param dx:ax Dividend.
; @param cx:bx Divisor.
; @returns dx:ax Quotient.
; cx:bx Remainder.
;
__I4D:
pushf
if VBOX_BIOS_CPU ge 80386
.386
push eax
push edx
push ecx
rol eax, 16
mov ax, dx
ror eax, 16
xor edx, edx
shr ecx, 16
mov cx, bx
idiv ecx ; eax:edx / ecx -> eax=quotient, edx=remainder.
mov bx, dx
pop ecx
shr edx, 16
mov cx, dx
pop edx
ror eax, 16
mov dx, ax
add sp, 2
pop ax
rol eax, 16
.8086
else
call NeedToImplementOn8086__I4D
endif
popf
ret
_TEXT ends
end
|
