1 files changed, 84 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/asm/ASMRdMsrEx.asm b/src/VBox/Runtime/common/asm/ASMRdMsrEx.asm
new file mode 100644
index 00000000..8d49a2b3
--- /dev/null
+++ b/src/VBox/Runtime/common/asm/ASMRdMsrEx.asm
@@ -0,0 +1,84 @@
+; $Id: ASMRdMsrEx.asm $
+;; @file
+; IPRT - ASMRdMsrEx().
+;
+
+;
+; Copyright (C) 2013-2019 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                                                                *
+;*******************************************************************************
+%include "iprt/asmdefs.mac"
+
+BEGINCODE
+
+;;
+; Special version of ASMRdMsr that allow specifying the rdi value.
+;
+; @param    uMsr    msc=rcx, gcc=rdi, x86=[ebp+8]   The MSR to read.
+; @param    uEdi    msc=rdx, gcc=rsi, x86=[ebp+12]  The EDI/RDI value.
+; @returns  MSR value in rax on amd64 and edx:eax on x86.
+;
+BEGINPROC_EXPORTED ASMRdMsrEx
+%ifdef ASM_CALL64_MSC
+proc_frame ASMRdMsrEx_DupWarningHack
+        push    rdi
+        [pushreg rdi]
+[endprolog]
+        and     ecx, ecx                ; serious paranoia
+        mov     rdi, rdx
+        xor     eax, eax
+        xor     edx, edx
+        rdmsr
+        pop     rdi
+        and     eax, eax                ; paranoia
+        shl     rdx, 32
+        or      rax, rdx
+        ret
+endproc_frame
+%elifdef ASM_CALL64_GCC
+        mov     ecx, edi
+        mov     rdi, rsi
+        xor     eax, eax
+        xor     edx, edx
+        rdmsr
+        and     eax, eax                ; paranoia
+        shl     rdx, 32
+        or      rax, rdx
+        ret
+%elifdef RT_ARCH_X86
+        push    ebp
+        mov     ebp, esp
+        push    edi
+        xor     eax, eax
+        xor     edx, edx
+        mov     ecx, [ebp + 8]
+        mov     edi, [esp + 12]
+        rdmsr
+        pop     edi
+        leave
+        ret
+%else
+ %error "Undefined arch?"
+%endif
+ENDPROC ASMRdMsrEx
+