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Diffstat (limited to '')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCmp.asm | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCmp.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCmp.asm new file mode 100644 index 00000000..1f032010 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCmp.asm @@ -0,0 +1,99 @@ +; $Id: bs3-cmn-MemCmp.asm $ +;; @file +; BS3Kit - Bs3MemCmp. +; + +; +; 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" + +;; +; @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 + |