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|
; $Id: bs3-mode-TrapSetJmpAndRestoreInRmAsm.asm $
;; @file
; BS3Kit - Bs3TrapSetJmpAndRestoreInRm helper
;
;
; 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_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
|
