| 1 | ; $Id: zero.asm 93253 2022-01-16 02:27:00Z vboxsync $
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| 2 | ;; @file
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| 3 | ; IPRT - Zero Memory.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2013-2022 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 | ;*******************************************************************************
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| 28 | ;* Header Files *
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| 29 | ;*******************************************************************************
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| 30 | %include "iprt/asmdefs.mac"
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| 31 |
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| 32 | ;
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| 33 | ; Section to put this in.
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| 34 | ;
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| 35 | ; - PE/COFF: Unless we put this in an BSS like section, the linker will
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| 36 | ; write out 64KB of zeros. (Tried using .rdata$zz and put it at the end
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| 37 | ; of that section, but the linker did not reduce the RawDataSize.) The
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| 38 | ; assmebler does not let us control the write flag directly, so we emit
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| 39 | ; a linker directive that switches of the write flag for the section.
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| 40 | ;
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| 41 | ; - Fallback: Code section.
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| 42 | ;
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| 43 | %ifdef ASM_FORMAT_PE
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| 44 | section .drectve info
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| 45 | db '-section:.zero,!W '
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| 46 | section .zero bss align=4096
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| 47 | %else
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| 48 | BEGINCODE
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| 49 | %endif
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| 50 |
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| 51 | ;;
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| 52 | ; 64KB of zero memory with various sized labels.
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| 53 | ;
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| 54 | EXPORTEDNAME_EX g_abRTZeroPage, object
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| 55 | EXPORTEDNAME_EX g_abRTZero4K, object
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| 56 | EXPORTEDNAME_EX g_abRTZero8K, object
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| 57 | EXPORTEDNAME_EX g_abRTZero16K, object
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| 58 | EXPORTEDNAME_EX g_abRTZero32K, object
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| 59 | EXPORTEDNAME_EX g_abRTZero64K, object
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| 60 | %ifdef ASM_FORMAT_PE
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| 61 | resb 0x10000
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| 62 | %else
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| 63 | times 0x10000/(16*4) dd 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0
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| 64 | %endif
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| 65 | %ifdef ASM_FORMAT_ELF
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| 66 | size g_abRTZeroPage _4K
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| 67 | size g_abRTZero4K _4K
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| 68 | size g_abRTZero8K _8K
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| 69 | size g_abRTZero16K _16K
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| 70 | size g_abRTZero32K _32K
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| 71 | size g_abRTZero64K _64K
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| 72 | %endif
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| 73 |
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