| 1 | ; $Id: bs3-cmn-MemCmp.asm 76553 2019-01-01 01:45:53Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3MemCmp.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2019 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 | %include "bs3kit-template-header.mac"
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| 28 |
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| 29 | ;;
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| 30 | ; @cproto BS3_CMN_PROTO_NOSB(int, Bs3MemCmp,(void const BS3_FAR *pv1, void const BS3_FAR *pv2, size_t cb));
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| 31 | ;
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| 32 | BS3_PROC_BEGIN_CMN Bs3MemCmp, BS3_PBC_HYBRID
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| 33 | TONLY16 CPU 8086
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| 34 | push xBP
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| 35 | mov xBP, xSP
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| 36 | push xDI
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| 37 | push xSI
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| 38 | TNOT64 push es
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| 39 | TONLY16 push ds
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| 40 | cld
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| 41 |
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| 42 | ;
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| 43 | ; To save complexity and space, do straight forward byte compares.
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| 44 | ;
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| 45 | %if TMPL_BITS == 16
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| 46 | mov di, [bp + 2 + cbCurRetAddr] ; pv1.off
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| 47 | mov es, [bp + 2 + cbCurRetAddr + 2] ; pv1.sel
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| 48 | mov si, [bp + 2 + cbCurRetAddr + 4] ; pv2.off
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| 49 | mov ds, [bp + 2 + cbCurRetAddr + 6] ; pv2.sel
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| 50 | mov cx, [bp + 2 + cbCurRetAddr + 8] ; cbDst
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| 51 | xor ax, ax
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| 52 | repe cmpsb
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| 53 | je .return
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| 54 |
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| 55 | mov al, [es:di - 1]
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| 56 | xor dx, dx
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| 57 | mov dl, [esi - 1]
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| 58 | sub ax, dx
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| 59 |
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| 60 | %else
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| 61 | %if TMPL_BITS == 64
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| 62 | mov rdi, rcx ; rdi = pv1
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| 63 | mov rsi, rdx ; rdi = pv2
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| 64 | mov rcx, r8 ; rcx = cbDst
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| 65 | %else
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| 66 | mov ax, ds
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| 67 | mov es, ax ; paranoia
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| 68 | mov edi, [ebp + 4 + cbCurRetAddr] ; pv1
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| 69 | mov esi, [ebp + 4 + cbCurRetAddr + 4] ; pv2
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| 70 | mov ecx, [ebp + 4 + cbCurRetAddr + 8] ; cbDst
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| 71 | %endif
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| 72 | xor eax, eax
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| 73 | repe cmpsb
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| 74 | je .return
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| 75 |
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| 76 | mov al, [xDI - 1]
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| 77 | movzx edx, byte [xSI - 1]
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| 78 | sub eax, edx
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| 79 | %endif
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| 80 |
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| 81 | .return:
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| 82 | TONLY16 pop ds
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| 83 | TNOT64 pop es
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| 84 | pop xSI
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| 85 | pop xDI
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| 86 | pop xBP
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| 87 | BS3_HYBRID_RET
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| 88 | BS3_PROC_END_CMN Bs3MemCmp
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| 89 |
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