; $Id: bootsector2-cpu-hidden-regs-1.asm 106061 2024-09-16 14:03:52Z vboxsync $ ;; @file ; Bootsector that shows/tests the content of hidden CPU registers. ; ; Requires VMMDevTesting. Enable it via VBoxManage: ; VBoxManage setextradata bs-cpu-hidden-regs-1 VBoxInternal/Devices/VMMDev/0/Config/TestingEnabled 1 ; ; Copyright (C) 2007-2024 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 . ; ; 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 "iprt/asmdefs.mac" %include "iprt/x86.mac" %include "VBox/VMMDevTesting.mac" ; ; Include and execute the init code. ; %define BS2_INIT_RM %define BS2_INC_PE16 %define BS2_INC_PE32 %define BS2_INC_PP32 %define BS2_INC_LM64 %define BS2_WITH_TRAPS %define BS2_WITH_MANUAL_LTR %include "bootsector2-common-init-code.mac" ; ; The benchmark driver ; BEGINPROC main ; ; Test prologue. ; mov ax, .s_szTstName call TestInit_r86 call Bs2EnableA20_r86 call Bs2PanicIfVMMDevTestingIsMissing_r86 call reportPostBiosValues call rmTests call doTests_rm_pe32 call doTests_rm_pp32 call doTests_rm_lm64 ; ; We're done. ; call TestTerm_r86 call Bs2Panic .s_szTstName: db 'tstCpuHidRegs', 0 ENDPROC main ; ; Reports the values of interesting hidden registers as we start the test, i.e. ; right after the BIOS completed. ; BEGINPROC reportPostBiosValues push ax push bx mov ax, .s_szTstInitial call TestSub_r86 mov ax, .s_szzStart call TestValueRegSZZ_rm .done pop bx pop ax ret .s_szzStart: db 'BIOS - ldtr:ldtr', 0; db 'BIOS - ldtr_base:ldtr_base', 0; db 'BIOS - ldtr_limit:ldtr_lim', 0; db 'BIOS - ldtr_attr:ldtr_attr', 0; db 'BIOS - tr:tr', 0; db 'BIOS - tr_base:tr_base', 0; db 'BIOS - tr_limit:tr_lim', 0; db 'BIOS - tr_attr:tr_attr', 0; db 'BIOS - cs:cs', 0; db 'BIOS - cs_base:cs_base', 0; db 'BIOS - cs_limit:cs_lim', 0; db 'BIOS - cs_attr:cs_attr', 0; db 'BIOS - ss:ss', 0; db 'BIOS - ss_base:ss_base', 0; db 'BIOS - ss_limit:ss_lim', 0; db 'BIOS - ss_attr:ss_attr', 0; db 'BIOS - ds:ds', 0; db 'BIOS - ds_base:ds_base', 0; db 'BIOS - ds_limit:ds_lim', 0; db 'BIOS - ds_attr:ds_attr', 0; db 0,0,0,0 ; terminator .s_szTstInitial: db 'Post BIOS Values', 0 ENDPROC reportPostBiosValues ; ; Reports the values of interesting hidden registers as we start the test, i.e. ; right after the BIOS completed. ; BEGINPROC rmTests push eax push ebx pushfd cli mov ax, .s_szTstRM call TestSub_r86 ; Check if CS changes when leaving protected mode. mov ax, .s_szzRMPre call TestValueRegSZZ_rm mov byte [cs:.s_dwDummy], 1 call Bs2EnterMode_rm_pe32 BITS 32 mov eax, .s_szzProt32 call TestValueRegSZZ_pe32 ; mov word [cs:.s_dwDummy], 2 - this shall GP(CS). call Bs2ExitMode_pe32 BITS 16 mov ax, .s_szzRMPost call TestValueRegSZZ_rm mov dword [cs:.s_dwDummy], 3 ; ; What happens if we make CS32 execute-only and return to real-mode. ; mov byte [cs:.s_dwDummy], 1 call Bs2EnterMode_rm_pe16 jmp BS2_SEL_CS16_EO:.loaded_cs16_eo .loaded_cs16_eo: mov eax, .s_szzProtEO call TestValueRegSZZ_pe16 ; mov ax, word [cs:.s_dwDummy] - this shall GP(CS). ; mov word [cs:.s_dwDummy], 2 - this shall GP(CS). ; Leave real-mode ourselves. mov eax, cr0 and eax, ~X86_CR0_PE mov cr0, eax ; All but cs gets reloaded. xor ax, ax mov ss, ax mov ds, ax mov es, ax mov fs, ax mov gs, ax ; Display CS and do a test. mov ax, .s_szzRMEO call TestValueRegSZZ_rm mov ax, [cs:.s_dwDummy] ; works on intel mov dword [cs:.s_dwDummy], 3 ; ditto jmp far 0000:.load_rm_cs .load_rm_cs: ; Display CS to check that it remained unchanged. mov ax, .s_szzRMEO2 call TestValueRegSZZ_rm ; Cleanup everything properly. call Bs2EnterMode_rm_pe32 BITS 32 call Bs2ExitMode_pe32 BITS 16 popfd pop ebx pop eax ret .s_dwDummy: dd 0 .s_szzRMPre: db 'RM Pre - cs:cs', 0; db 'RM Pre - cs_base:cs_base', 0; db 'RM Pre - cs_limit:cs_lim', 0; db 'RM Pre - cs_attr:cs_attr', 0; db 0,0,0,0 ; terminator .s_szzProt32: db 'Prot32 - cs:cs', 0; db 'Prot32 - cs_base:cs_base', 0; db 'Prot32 - cs_limit:cs_lim', 0; db 'Prot32 - cs_attr:cs_attr', 0; db 0,0,0,0 ; terminator .s_szzRMPost: db 'RM Post - cs:cs', 0; db 'RM Post - cs_base:cs_base', 0; db 'RM Post - cs_limit:cs_lim', 0; db 'RM Post - cs_attr:cs_attr', 0; db 0,0,0,0 ; terminator .s_szzProtEO: db 'Prot 16 EO,L-1,NA - cs:cs', 0; db 'Prot 16 EO,L-1,NA - cs_base:cs_base', 0; db 'Prot 16 EO,L-1,NA - cs_limit:cs_lim', 0; db 'Prot 16 EO,L-1,NA - cs_attr:cs_attr', 0; db 0,0,0,0 ; terminator .s_szzRMEO: db 'RM Post EO,L-1,NA - cs:cs', 0; db 'RM Post EO,L-1,NA - cs_base:cs_base', 0; db 'RM Post EO,L-1,NA - cs_limit:cs_lim', 0; db 'RM Post EO,L-1,NA - cs_attr:cs_attr', 0; db 0,0,0,0 ; terminator .s_szzRMEO2: db 'RM CS(0) EO,L-1 - cs:cs', 0; db 'RM CS(0) EO,L-1 - cs_base:cs_base', 0; db 'RM CS(0) EO,L-1 - cs_limit:cs_lim', 0; db 'RM CS(0) EO,L-1 - cs_attr:cs_attr', 0; db 0,0,0,0 ; terminator .s_szTstRM: db 'Real Mode Test', 0 ENDPROC rmTests ; ; Instantiate the template code. ; %include "bootsector2-template-footer.mac" ; reset the initial environemnt. %define TMPL_RM %include "bootsector2-cpu-hidden-regs-1-template.mac" ;%define TMPL_CMN_V86 ;%include "bootsector2-cpu-hidden-regs-1-template.mac" %define TMPL_PE16 %include "bootsector2-cpu-hidden-regs-1-template.mac" %define TMPL_PE32 %include "bootsector2-cpu-hidden-regs-1-template.mac" ;%define TMPL_PP16 ;%include "bootsector2-cpu-hidden-regs-1-template.mac" %define TMPL_PP32 %include "bootsector2-cpu-hidden-regs-1-template.mac" ;%define TMPL_PAE16 ;%include "bootsector2-cpu-hidden-regs-1-template.mac" ;%define TMPL_PAE32 ;%include "bootsector2-cpu-hidden-regs-1-template.mac" ;%define TMPL_LM16 ;%include "bootsector2-cpu-hidden-regs-1-template.mac" ;%define TMPL_LM32 ;%include "bootsector2-cpu-hidden-regs-1-template.mac" %define TMPL_LM64 %include "bootsector2-cpu-hidden-regs-1-template.mac" ; ; End sections and image. ; %include "bootsector2-common-end.mac"