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Diffstat (limited to 'src/VBox/Runtime/common/misc/zero.asm')
-rw-r--r-- | src/VBox/Runtime/common/misc/zero.asm | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/misc/zero.asm b/src/VBox/Runtime/common/misc/zero.asm new file mode 100644 index 00000000..d6111c63 --- /dev/null +++ b/src/VBox/Runtime/common/misc/zero.asm @@ -0,0 +1,83 @@ +; $Id: zero.asm $ +;; @file +; IPRT - Zero Memory. +; + +; +; Copyright (C) 2013-2023 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 +; + +;******************************************************************************* +;* Header Files * +;******************************************************************************* +%include "iprt/asmdefs.mac" + +; +; Section to put this in. +; +; - PE/COFF: Unless we put this in an BSS like section, the linker will +; write out 64KB of zeros. (Tried using .rdata$zz and put it at the end +; of that section, but the linker did not reduce the RawDataSize.) The +; assmebler does not let us control the write flag directly, so we emit +; a linker directive that switches of the write flag for the section. +; +; - Fallback: Code section. +; +%ifdef ASM_FORMAT_PE +section .drectve info + db '-section:.zero,!W ' +section .zero bss align=4096 +%else +BEGINCODE +%endif + +;; +; 64KB of zero memory with various sized labels. +; +EXPORTEDNAME_EX g_abRTZeroPage, object +EXPORTEDNAME_EX g_abRTZero4K, object +EXPORTEDNAME_EX g_abRTZero8K, object +EXPORTEDNAME_EX g_abRTZero16K, object +EXPORTEDNAME_EX g_abRTZero32K, object +EXPORTEDNAME_EX g_abRTZero64K, object +%ifdef ASM_FORMAT_PE + resb 0x10000 +%else + times 0x10000/(16*4) dd 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0 +%endif +%ifdef ASM_FORMAT_ELF +size g_abRTZeroPage _4K +size g_abRTZero4K _4K +size g_abRTZero8K _8K +size g_abRTZero16K _16K +size g_abRTZero32K _32K +size g_abRTZero64K _64K +%endif + |