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; $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
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