1 files changed, 70 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/asm/ASMSetXcr0.asm b/src/VBox/Runtime/common/asm/ASMSetXcr0.asm
new file mode 100644
index 00000000..a282270d
--- /dev/null
+++ b/src/VBox/Runtime/common/asm/ASMSetXcr0.asm
@@ -0,0 +1,70 @@
+; $Id: ASMSetXcr0.asm $
+;; @file
+; IPRT - ASMSetXcr0().
+;
+
+;
+; Copyright (C) 2006-2020 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.
+;
+
+;*******************************************************************************
+;* Header Files                                                                *
+;*******************************************************************************
+%define RT_ASM_WITH_SEH64
+%include "iprt/asmdefs.mac"
+
+BEGINCODE
+
+;;
+; Sets the content of the Xcr0 CPU register.
+; @param   uXcr0    The new XCR0 content.
+;                   msc=rcx, gcc=rdi, x86=[esp+4]
+;
+BEGINPROC_EXPORTED ASMSetXcr0
+SEH64_END_PROLOGUE
+%ifdef ASM_CALL64_MSC
+        mov     rdx, rcx
+        shr     rdx, 32
+        mov     eax, ecx
+%elifdef ASM_CALL64_GCC
+        mov     rdx, rdi
+        shr     rdx, 32
+        mov     eax, edi
+%elif ARCH_BITS == 32
+        mov     eax, [esp + 4]
+        mov     edx, [esp + 8]
+%elif ARCH_BITS == 16
+        push    bp
+        mov     bp, sp
+        mov     eax, [bp + 4]
+        mov     edx, [bp + 8]
+%else
+ %error "Undefined arch?"
+%endif
+
+        xor     ecx, ecx
+        xsetbv
+
+%if ARCH_BITS == 16
+        leave
+%endif
+        ret
+ENDPROC ASMSetXcr0
+