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|
; $Id: bs3-cmn-ExtCtxSave.asm $
;; @file
; BS3Kit - Bs3ExtCtxSave.
;
;
; Copyright (C) 2007-2023 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
;
%include "bs3kit-template-header.mac"
extern BS3_CMN_NM(Bs3RegSetXcr0)
;;
; Saves the extended CPU context (FPU, SSE, AVX, ++).
;
; @param pExtCtx
;
BS3_PROC_BEGIN_CMN Bs3ExtCtxSave, BS3_PBC_NEAR
push xBP
mov xBP, xSP
push sAX
push sCX
push sDX
push xBX
BONLY16 push es
%if ARCH_BITS == 16
les bx, [xBP + xCB + cbCurRetAddr]
mov al, [es:bx + BS3EXTCTX.enmMethod]
cmp al, BS3EXTCTXMETHOD_XSAVE
je .do_16_xsave
cmp al, BS3EXTCTXMETHOD_FXSAVE
je .do_16_fxsave
cmp al, BS3EXTCTXMETHOD_ANCIENT
je .do_16_ancient
int3
.do_16_ancient:
fnsave [es:bx + BS3EXTCTX.Ctx]
jmp .return
.do_16_fxsave:
fxsave [es:bx + BS3EXTCTX.Ctx]
jmp .return
.do_16_xsave:
; xgetbv can be used in any ring!
xor ecx, ecx
xgetbv
mov [es:bx + BS3EXTCTX.fXcr0Saved], eax
mov [es:bx + BS3EXTCTX.fXcr0Saved + 4], edx
push dword [es:bx + BS3EXTCTX.fXcr0Nominal + 4]
push dword [es:bx + BS3EXTCTX.fXcr0Nominal]
call BS3_CMN_NM(Bs3RegSetXcr0)
mov eax, [es:bx + BS3EXTCTX.fXcr0Nominal]
mov edx, [es:bx + BS3EXTCTX.fXcr0Nominal + 4]
xsave [es:bx + BS3EXTCTX.Ctx]
push dword [es:bx + BS3EXTCTX.fXcr0Saved + 4]
push dword [es:bx + BS3EXTCTX.fXcr0Saved]
call BS3_CMN_NM(Bs3RegSetXcr0)
add xSP, 4 * 2 * 2 ; clean up both calls
;jmp .return
%else
BONLY32 mov ebx, [xBP + xCB + cbCurRetAddr]
BONLY64 mov rbx, rcx
mov al, [xBX + BS3EXTCTX.enmMethod]
cmp al, BS3EXTCTXMETHOD_XSAVE
je .do_xsave
cmp al, BS3EXTCTXMETHOD_FXSAVE
je .do_fxsave
cmp al, BS3EXTCTXMETHOD_ANCIENT
je .do_ancient
int3
.do_ancient:
fnsave [xBX + BS3EXTCTX.Ctx]
jmp .return
.do_fxsave:
BONLY32 fxsave [xBX + BS3EXTCTX.Ctx]
BONLY64 fxsave64 [xBX + BS3EXTCTX.Ctx]
jmp .return
.do_xsave:
xor ecx, ecx
xgetbv
mov [xBX + BS3EXTCTX.fXcr0Saved], eax
mov [xBX + BS3EXTCTX.fXcr0Saved + 4], edx
%if ARCH_BITS == 32
push dword [xBX + BS3EXTCTX.fXcr0Nominal + 4]
push dword [xBX + BS3EXTCTX.fXcr0Nominal]
call BS3_CMN_NM(Bs3RegSetXcr0)
mov eax, [xBX + BS3EXTCTX.fXcr0Nominal]
mov edx, [xBX + BS3EXTCTX.fXcr0Nominal + 4]
xsave [xBX + BS3EXTCTX.Ctx]
push dword [xBX + BS3EXTCTX.fXcr0Saved + 4]
push dword [xBX + BS3EXTCTX.fXcr0Saved]
call BS3_CMN_NM(Bs3RegSetXcr0)
add xSP, 4 * 2 * 2 ; clean up both calls
%else
mov rcx, [xBX + BS3EXTCTX.fXcr0Nominal]
push rcx ; only to reserve necessary stack space for the Bs3RegSetXcr0 param dump.
call BS3_CMN_NM(Bs3RegSetXcr0)
mov eax, [xBX + BS3EXTCTX.fXcr0Nominal]
mov edx, [xBX + BS3EXTCTX.fXcr0Nominal + 4]
xsave64 [xBX + BS3EXTCTX.Ctx]
mov rcx, [xBX + BS3EXTCTX.fXcr0Saved]
call BS3_CMN_NM(Bs3RegSetXcr0)
add xSP, 8h ; clean up
%endif
;jmp .return
%endif
.return:
BONLY16 pop es
pop xBX
pop sDX
pop sCX
pop sAX
mov xSP, xBP
pop xBP
ret
BS3_PROC_END_CMN Bs3ExtCtxSave
|
