diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchTo32BitAndCallC.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchTo32BitAndCallC.asm | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchTo32BitAndCallC.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchTo32BitAndCallC.asm new file mode 100644 index 00000000..37a18515 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchTo32BitAndCallC.asm @@ -0,0 +1,164 @@ +; $Id: bs3-mode-SwitchTo32BitAndCallC.asm $ +;; @file +; BS3Kit - bs3SwitchTo32BitAndCallC +; + +; +; Copyright (C) 2007-2022 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 +; + +;********************************************************************************************************************************* +;* Header Files * +;********************************************************************************************************************************* +%include "bs3kit-template-header.mac" + + +;********************************************************************************************************************************* +;* External Symbols * +;********************************************************************************************************************************* +BS3_EXTERN_DATA16 g_bBs3CurrentMode +TMPL_BEGIN_TEXT + +%ifdef BS3_STRICT +BS3_EXTERN_CMN Bs3Panic +%endif + +%if BS3_MODE_IS_RM_OR_V86(TMPL_MODE) +BS3_EXTERN_CMN Bs3SelRealModeCodeToFlat +%endif + +%if TMPL_MODE == BS3_MODE_RM +extern NAME(Bs3SwitchToPE32_rm) +extern NAME(Bs3SwitchToRM_pe32) +%elif !BS3_MODE_IS_32BIT_CODE(TMPL_MODE) +BS3_EXTERN_CMN Bs3SwitchTo32Bit + %if BS3_MODE_IS_16BIT_CODE_NO_V86(TMPL_MODE) +extern _Bs3SwitchTo16Bit_c32 + %elif BS3_MODE_IS_V86(TMPL_MODE) +extern _Bs3SwitchTo16BitV86_c32 + %elif !BS3_MODE_IS_32BIT_CODE(TMPL_MODE) +extern _Bs3SwitchTo64_c32 + %endif +%endif + + + +;; +; @cproto BS3_MODE_PROTO_STUB(int, Bs3SwitchTo32BitAndCallC,(PFNBS3FARADDRCONV fpfnCall, unsigned cbParams, ...)); +; +BS3_PROC_BEGIN_MODE Bs3SwitchTo32BitAndCallC, BS3_PBC_HYBRID + BS3_CALL_CONV_PROLOG 4 +TONLY16 inc xBP + push xBP + mov xBP, xSP + push xSI + + ; + ; Push the arguments first. + ; +TONLY16 mov si, [xBP + xCB + cbCurRetAddr + sCB] +TNOT16 mov esi, [xBP + xCB + cbCurRetAddr + sCB] +%ifdef BS3_STRICT + test xSI, 3 + jz .cbParams_ok + call Bs3Panic +.cbParams_ok: + cmp byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], TMPL_MODE + je .mode_ok + call Bs3Panic +.mode_ok: +%endif + add xSI, sCB - 1 ; round it up to nearest push size / dword. + and xSI, ~(sCB - 1) + jz .done_pushing ; skip if zero +.push_more: + push xPRE [xBP + xCB + cbCurRetAddr + sCB + xCB + xSI - xCB] + sub xSI, xCB + jnz .push_more + mov xSI, xAX ; restore xSI +.done_pushing: + + ; + ; Load fpfnCall into eax. + ; +%if BS3_MODE_IS_RM_OR_V86(TMPL_MODE) + push sPRE [xBP + xCB + cbCurRetAddr] + BS3_CALL Bs3SelRealModeCodeToFlat, 1 + add xSP, sCB + rol eax, 16 + mov ax, dx + rol eax, 16 +%else + mov eax, [xBP + xCB + cbCurRetAddr] +%endif + + ; + ; Switch to 32-bit mode, if this is real mode pick PE32. + ; +%if TMPL_MODE == BS3_MODE_RM + call NAME(Bs3SwitchToPE32_rm) + BS3_SET_BITS 32 +%elif !BS3_MODE_IS_32BIT_CODE(TMPL_MODE) + call Bs3SwitchTo32Bit + BS3_SET_BITS 32 +%endif + + ; + ; Make the call. + ; + call eax + + ; + ; Return, preserving xAX. + ; +%if BS3_MODE_IS_RM_OR_V86(TMPL_MODE) + mov edx, eax + shr edx, 16 +%endif +%if TMPL_MODE == BS3_MODE_RM + call NAME(Bs3SwitchToRM_pe32) +%elif BS3_MODE_IS_16BIT_CODE_NO_V86(TMPL_MODE) + call _Bs3SwitchTo16Bit_c32 +%elif BS3_MODE_IS_V86(TMPL_MODE) + call _Bs3SwitchTo16BitV86_c32 +%elif !BS3_MODE_IS_32BIT_CODE(TMPL_MODE) + call _Bs3SwitchTo64_c32 +%endif + BS3_SET_BITS TMPL_BITS + + ; Epilog. + lea xSP, [xBP - xCB] + pop xSI + pop xBP +TONLY16 dec xBP + BS3_CALL_CONV_EPILOG 4 + BS3_HYBRID_RET +BS3_PROC_END_MODE Bs3SwitchTo32BitAndCallC + |