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; $Id: bs3-cmn-MemCmp.asm $
;; @file
; BS3Kit - Bs3MemCmp.
;
;
; 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"
;;
; @cproto BS3_CMN_PROTO_NOSB(int, Bs3MemCmp,(void const BS3_FAR *pv1, void const BS3_FAR *pv2, size_t cb));
;
BS3_PROC_BEGIN_CMN Bs3MemCmp, BS3_PBC_HYBRID
TONLY16 CPU 8086
push xBP
mov xBP, xSP
push xDI
push xSI
TNOT64 push es
TONLY16 push ds
cld
;
; To save complexity and space, do straight forward byte compares.
;
%if TMPL_BITS == 16
mov di, [bp + 2 + cbCurRetAddr] ; pv1.off
mov es, [bp + 2 + cbCurRetAddr + 2] ; pv1.sel
mov si, [bp + 2 + cbCurRetAddr + 4] ; pv2.off
mov ds, [bp + 2 + cbCurRetAddr + 6] ; pv2.sel
mov cx, [bp + 2 + cbCurRetAddr + 8] ; cbDst
xor ax, ax
repe cmpsb
je .return
mov al, [es:di - 1]
xor dx, dx
mov dl, [esi - 1]
sub ax, dx
%else
%if TMPL_BITS == 64
mov rdi, rcx ; rdi = pv1
mov rsi, rdx ; rdi = pv2
mov rcx, r8 ; rcx = cbDst
%else
mov ax, ds
mov es, ax ; paranoia
mov edi, [ebp + 4 + cbCurRetAddr] ; pv1
mov esi, [ebp + 4 + cbCurRetAddr + 4] ; pv2
mov ecx, [ebp + 4 + cbCurRetAddr + 8] ; cbDst
%endif
xor eax, eax
repe cmpsb
je .return
mov al, [xDI - 1]
movzx edx, byte [xSI - 1]
sub eax, edx
%endif
.return:
TONLY16 pop ds
TNOT64 pop es
pop xSI
pop xDI
pop xBP
BS3_HYBRID_RET
BS3_PROC_END_CMN Bs3MemCmp
|
