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|
; $Id: bootsector2-cpu-ac-loop.asm $
;; @file
; Bootsector test for debug exceptions.
;
; Recommended (but not necessary):
; VBoxManage setextradata bs-cpu-xcpt-2 VBoxInternal/Devices/VMMDev/0/Config/TestingEnabled 1
;
;
; 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 "iprt/asmdefs.mac"
%include "iprt/x86.mac"
%include "VBox/VMMDevTesting.mac"
;
; Include and execute the init code.
;
%define BS2_INIT_PE32
%define BS2_WITH_TRAPS
%define BS2_WITH_TRAPRECS
%define BS2_INC_PE32
%define BS2_INC_RM ; for SetCpuModeGlobals_rm
%include "bootsector2-common-init-code.mac"
;
; The main() function.
;
BEGINPROC main
BITS 32
;
; Test prologue.
;
mov ax, .s_szTstName
call TestInit_p32
call Bs2EnableA20_p32
cli ; raw-mode hack
;
; Execute the tests
;
sub esp, 20h
; Get the address of the #AC IDT entry.
sidt [esp]
mov eax, [esp + 2]
add eax, 8 * X86_XCPT_AC
; Make it execute in ring-3.
mov word [eax + 2], BS2_SEL_R3_CS32 ; u16Sel
or byte [eax + 5], 3 << 5 ; u2Dpl = 3
; Enable AC.
mov eax, cr0
or eax, X86_CR0_AM
mov cr0, eax
; Switch to ring-3
call Bs2ToRing3_p32
; Enable AC.
pushfd
or dword [esp], X86_EFL_AC
popfd
;; Test it. - won't work as the handle touches CR2, which traps in ring-3.
;BS2_TRAP_INSTR X86_XCPT_AC, 0, mov dword [esp + 3], 0
; Misalign the stack and use it.
or esp, 3
push esp ; this will loop forever on real intel hardware.
and esp, ~3h
add esp, 20h
;
; We're done.
;
call TestTerm_p32
ret
.s_szTstName:
db 'tstCpuAcLoop', 0
ENDPROC main
;
; End sections and image.
;
%include "bootsector2-common-end.mac"
|
