diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bootsector2-cpu-db-loop.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bootsector2-cpu-db-loop.asm | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-db-loop.asm b/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-db-loop.asm new file mode 100644 index 00000000..212906e2 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-db-loop.asm @@ -0,0 +1,161 @@ +; $Id: bootsector2-cpu-db-loop.asm $ +;; @file +; Bootsector test for debug exception loop. +; +; Recommended (but not necessary): +; VBoxManage setextradata bs-cpu-db-loop VBoxInternal/Devices/VMMDev/0/Config/TestingEnabled 1 +; + +; +; 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 "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_XCPT_DB_CLEARING_TF + %define BS2_INC_PE16 + %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 + sub esp, 20h + + call Bs2Thunk_p32_p16 + BITS 16 + + ; + ; We require a stack that can wrap around here. The default stack + ; doesn't allow us to do this, so we'll configure a custom one + ; where the page tables usually are. + ; + mov eax, [bs2Gdt + BS2_SEL_SS16] + mov ebx, [bs2Gdt + BS2_SEL_SS16 + 4] + + and eax, 0xffff + or eax, (BS2_PXX_BASE & 0xffff) << 16 + and ebx, 0x00ffff00 + or ebx, BS2_PXX_BASE & 0xff000000 + or ebx, (BS2_PXX_BASE & 0x00ff0000) >> 16 + mov [bs2GdtSpare0], eax + mov [bs2GdtSpare0 + 4], ebx + + + ; + ; Switch the stack. + ; + mov ax, ss + mov es, ax ; saved ss + mov edi, esp ; saved esp + + mov ax, BS2_SEL_SPARE0 + mov ss, ax + mov esp, 0xfff0 + + + ; + ; Arm the breakpoint. + ; + and dword [esp + 2], 0 + sidt [esp] + mov eax, [esp + 2] + add eax, 8 + mov dr0, eax + mov eax, X86_DR7_RA1_MASK | X86_DR7_GE \ + | X86_DR7_L0 | X86_DR7_G0 | X86_DR7_RW(0, X86_DR7_RW_RW) | X86_DR7_LEN(0, X86_DR7_LEN_DWORD) + mov dr7, eax + + ; + ; Trigger a single step exception. + ; + pushf + or word [xSP], X86_EFL_TF + popf + xchg eax, ebx + xchg edx, ecx ; should get a #DB here. + xchg eax, ebx + xchg edx, ecx + + ; + ; If we get thus far, we've failed. + ; + mov ax, es ; restore ss + mov ss, ax + mov esp, edi ; restore esp + + call Bs2Thunk_p16_p32 + BITS 32 + + mov eax, .s_szFailed + call TestFailed_p32 + + ; + ; We're done. + ; + call TestTerm_p32 + add esp, 20h + ret + +.s_szTstName: + db 'tstCpuDbLoop', 0 +.s_szFailed: + db 'no #DB loop detected',0 +ENDPROC main + + +; +; End sections and image. +; +%include "bootsector2-common-end.mac" + |