diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-TrapSetJmpAndRestoreInRmAsm.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-TrapSetJmpAndRestoreInRmAsm.asm | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-TrapSetJmpAndRestoreInRmAsm.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-TrapSetJmpAndRestoreInRmAsm.asm new file mode 100644 index 00000000..52c0928a --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-TrapSetJmpAndRestoreInRmAsm.asm @@ -0,0 +1,174 @@ +; $Id: bs3-mode-TrapSetJmpAndRestoreInRmAsm.asm $ +;; @file +; BS3Kit - Bs3TrapSetJmpAndRestoreInRm helper +; + +; +; 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 +; + +;********************************************************************************************************************************* +;* Header Files * +;********************************************************************************************************************************* +%include "bs3kit-template-header.mac" + + +;********************************************************************************************************************************* +;* External Symbols * +;********************************************************************************************************************************* +BS3_BEGIN_TEXT16 +extern RT_CONCAT3(_Bs3SwitchTo,TMPL_MODE_UNAME,_Safe_rm) +extern _Bs3TrapSetJmpAndRestore_c16 + +TMPL_BEGIN_TEXT +extern TMPL_NM(Bs3SwitchToRM) + + +;; +; Shared prologue code. +; @param xAX Where to jump to for the main event. +; +BS3_PROC_BEGIN_MODE Bs3TrapSetJmpAndRestoreInRmAsm, BS3_PBC_NEAR + BS3_CALL_CONV_PROLOG 2 + push xBP + mov xBP, xSP + xPUSHF + + ; + ; Save non-volatile registers so the DO function doesn't have to. + ; + push xBX + push xCX + push xDX + push xSI + push xDI +%if TMPL_BITS != 64 + push ds + push es + push ss + %if TMPL_BITS != 16 + push fs + push gs + %endif +%endif +%if TMPL_BITS == 64 + push r8 + push r9 + push r10 + push r11 + push r12 + push r13 + push r14 + push r15 +%endif + + ; + ; Load EAX and EDX with the two pointers. + ; + mov eax, [xBP + xCB + cbCurRetAddr] + mov edx, [xBP + xCB + cbCurRetAddr + sCB] + + ; + ; Jump to 16-bit segment for the mode switching. + ; +%if TMPL_BITS != 16 + jmp .in_16bit_segment +BS3_BEGIN_TEXT16 + BS3_SET_BITS TMPL_BITS +.in_16bit_segment: +%endif + + ; + ; Switch to real-mode. + ; + call TMPL_NM(Bs3SwitchToRM) + BS3_SET_BITS 16 + + ; + ; Now we do the + ; + push edx + push eax + call _Bs3TrapSetJmpAndRestore_c16 + add sp, 8h + + ; + ; Switch back to the original mode. + ; + call RT_CONCAT3(_Bs3SwitchTo,TMPL_MODE_UNAME,_Safe_rm) + BS3_SET_BITS TMPL_BITS + + ; + ; Jump back to the 32-bit or 64-bit segment. + ; +%if TMPL_BITS != 16 + jmp .in_text_segment +TMPL_BEGIN_TEXT +.in_text_segment: +%endif + + ; + ; Restore registers. + ; +%if TMPL_BITS == 16 + sub bp, (1+5+3)*2 + mov sp, bp +%elif TMPL_BITS == 32 + lea xSP, [xBP - (1+5+5)*4] +%else + lea xSP, [xBP - (1+5+8)*8] + pop r15 + pop r14 + pop r13 + pop r12 + pop r11 + pop r10 + pop r9 + pop r8 +%endif +%if TMPL_BITS != 64 + %if TMPL_BITS != 16 + pop gs + pop fs + %endif + pop ss + pop es + pop ds +%endif + pop xDI + pop xSI + pop xDX + pop xCX + pop xBX + xPOPF + pop xBP + ret +BS3_PROC_END_MODE Bs3TrapSetJmpAndRestoreInRmAsm + |