diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxRestoreEx.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxRestoreEx.asm | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxRestoreEx.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxRestoreEx.asm new file mode 100644 index 00000000..46f86ced --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxRestoreEx.asm @@ -0,0 +1,136 @@ +; $Id: bs3-cmn-ExtCtxRestoreEx.asm $ +;; @file +; BS3Kit - Bs3ExtCtxRestoreEx. +; + +; +; 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" + + +%if ARCH_BITS != 64 +BS3_EXTERN_DATA16 g_bBs3CurrentMode + +BS3_BEGIN_TEXT64 +extern _Bs3ExtCtxRestore_c64 + %if ARCH_BITS == 16 +extern BS3_CMN_NM(Bs3SelProtFar16DataToFlat) +extern _Bs3SwitchTo16Bit_c64 + %else +extern _Bs3SwitchTo32Bit_c64 + %endif + +TMPL_BEGIN_TEXT +extern BS3_CMN_NM(Bs3SwitchTo64Bit) + %if ARCH_BITS == 16 +extern BS3_CMN_NM(Bs3SelProtFar16DataToFlat) + %endif +%endif + +extern BS3_CMN_NM(Bs3ExtCtxRestore) + + + +;; +; Restores the extended CPU context (FPU, SSE, AVX, ++), full 64-bit +; when in long mode. +; +; @param pExtCtx +; +BS3_PROC_BEGIN_CMN Bs3ExtCtxRestoreEx, BS3_PBC_NEAR +%if ARCH_BITS == 64 + jmp BS3_CMN_NM(Bs3ExtCtxRestore) +%else + push xBP + mov xBP, xSP + push sAX + + ; + ; Check if we're in long mode. + ; + mov al, [BS3_DATA16_WRT(g_bBs3CurrentMode)] + and al, BS3_MODE_SYS_MASK + cmp al, BS3_MODE_SYS_LM + je .in_long_mode + + ; + ; Not in long mode, so do normal restore. + ; + pop sAX + leave + jmp BS3_CMN_NM(Bs3ExtCtxRestore) + + ; + ; Switch to 64-bit to do the restoring so we can restore 64-bit only state. + ; +.in_long_mode: + push sCX +BONLY16 push sDX + + ; Load ecx with the flat pExtCtx address. + mov ecx, [xBP + xCB + cbCurRetAddr] + + %if ARCH_BITS == 16 + push ecx + call BS3_CMN_NM(Bs3SelProtFar16DataToFlat) + mov ecx, edx + shl ecx, 16 + mov cx, ax + %endif + + ; Switch to 64-bit mode. + call BS3_CMN_NM(Bs3SwitchTo64Bit) + BITS 64 + + ; Do the restore. + sub rsp, 20h + call _Bs3ExtCtxRestore_c64 + add rsp, 20h + + ; Switch back to the original mode. + %if ARCH_BITS == 16 + call _Bs3SwitchTo16Bit_c64 + %else + call _Bs3SwitchTo32Bit_c64 + %endif + BITS ARCH_BITS + + ; Restore context and return. +BONLY16 pop sDX + pop sCX + + pop sAX + leave + ret +%endif +BS3_PROC_END_CMN Bs3ExtCtxRestoreEx + |