1 files changed, 74 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..e6f00b8c
--- /dev/null
+++ b/src/VBox/Runtime/include/internal/alignmentchecks.h
@@ -0,0 +1,74 @@
+/* $Id: alignmentchecks.h $ */
+/** @file
+ * IPRT - Internal header for hacking alignment checks on x86 and AMD64.
+ */
+
+/*
+ * Copyright (C) 2009-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ */
+
+#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 */
+