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Diffstat (limited to 'src/VBox/Runtime/include/internal/alignmentchecks.h')
| -rw-r--r-- | src/VBox/Runtime/include/internal/alignmentchecks.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/VBox/Runtime/include/internal/alignmentchecks.h b/src/VBox/Runtime/include/internal/alignmentchecks.h new file mode 100644 index 00000000..99573d42 --- /dev/null +++ b/src/VBox/Runtime/include/internal/alignmentchecks.h @@ -0,0 +1,84 @@ +/* $Id: alignmentchecks.h $ */ +/** @file + * IPRT - Internal header for hacking alignment checks on x86 and AMD64. + */ + +/* + * Copyright (C) 2009-2023 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 + */ + +#ifndef IPRT_INCLUDED_INTERNAL_alignmentchecks_h +#define IPRT_INCLUDED_INTERNAL_alignmentchecks_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +/** @def IPRT_WITH_ALIGNMENT_CHECKS + * Enables or disables the alignment check feature and related hacks. */ + +#ifndef IPRT_WITH_ALIGNMENT_CHECKS +# if ( defined(DEBUG) && !defined(IN_GUEST) ) || defined(DOXYGEN_RUNNING) +# define IPRT_WITH_ALIGNMENT_CHECKS 1 +# endif +#endif + +/** @def IPRT_ALIGNMENT_CHECKS_DISABLE + * Disables alignment checks. + * Typically used before calling problematic library functions. + */ + +/** @def IPRT_ALIGNMENT_CHECKS_ENABLE + * (re-)Enables alignment checks if they are supposed to be active. + * This is used to counter IPRT_ALIGNMENT_CHECKS_DISABLE as well as enabling + * them for the first time. + */ + +#if defined(IPRT_WITH_ALIGNMENT_CHECKS) \ + && ( defined(RT_ARCH_AMD64) \ + || defined(RT_ARCH_X86) ) +# include <iprt/asm-amd64-x86.h> + +RT_C_DECLS_BEGIN +extern RTDATADECL(bool) g_fRTAlignmentChecks; +RT_C_DECLS_END + +# define IPRT_ALIGNMENT_CHECKS_DISABLE() \ + do { if (g_fRTAlignmentChecks) ASMSetFlags(ASMGetFlags() & ~RT_BIT_32(18)); } while (0) + +# define IPRT_ALIGNMENT_CHECKS_ENABLE() \ + do { if (g_fRTAlignmentChecks) ASMSetFlags(ASMGetFlags() | RT_BIT_32(18)); } while (0) + +#else +# define IPRT_ALIGNMENT_CHECKS_DISABLE() do {} while (0) +# define IPRT_ALIGNMENT_CHECKS_ENABLE() do {} while (0) +#endif + +#endif /* !IPRT_INCLUDED_INTERNAL_alignmentchecks_h */ + |