# Configuring QEMU Kernel Mode Debugging with EXDI - Windows Drivers (2023)

• Article

This topic describes how to configure QEMU kernel mode debugging using EXDI. Windows Debugger supports kernel debugging from a QEMU environment with EXDI. This document describes the steps required to establish a GdbServer RSP session between ExdiGdbSrv.dll (GDB Server Client) and QEMU GDB Server.

The described scenario uses a Windows x64 virtual machine and a QEMU GDB server, which also runs on Windows.

It is possible to connect to other operating systems that serve as a host, for example. B.Linux. QEMU, the virtualization and machine emulation software, runs on multiple architectures including x64 and Arm64. The ExdiGdb debug server is also compatible with other processors, for example it is possible to use WinDbg to debug QEMU running on Arm64. This provides multiple options for debugging a Windows VM, allowing the Windows VM to be HW debugged through the available QEMU GDB server connected to the debugger host's EXDI GDB server client.

For general information about installing, configuring, and troubleshooting EXDI connections, seeConfiguring EXDI debugger transport.

Use

EXDI is an advanced and specialized form of debugging for specific environments. Using a standard KDNET connection is easier to configure and is recommended. To configure network debugging automatically, seeKDNET network kernel debug auto setup.

EXDI is an interface that allows you to extend WinDbg by adding support for hardware debuggers (eg JTAG based or GdbServer based). The following diagram illustrates the role of EXDI-GdbServer.

Important

Since EXDI does not use the KDNET protocol, the attached debugger has much less information about what is running on the PC and many commands work differently or may not work at all. Accessing private symbols for the code to be debugged can help the debugger better understand code execution on the target system. For more information, seePublic and private icons.

## Configure a debugger connection to a Windows image in QEMU

In this topic, we describe the process of connecting to a Windows QEMU virtual image running on Windows.

2. Configure a Windows virtual QEMU target image to boot with the necessary network and BIOS/UEFI settings for debugging.
3. Start the QEMU environment using the configured startup script.
4. Start gdbserver on QEMU.
5. Check network connectivity and find and note the IP address of the target image. (Default HOST IP address from 1.2.3.4).
7. Download, build, register and configure EXDI server for QEMU on Github.
8. Configure the debugger host (WinDbg) by editing the EXDI configuration XML files.
9. Start WinDbg from the command line to connect to the EXDI server.
10. Use WinDbg to debug the target Windows QEMU image.

QEMU is an open source generic machine virtualizer and emulator that performs dynamic translation. When used as a machine emulator, QEMU can run operating systems and programs written for one processor (eg Arm64) on another machine (an x64 PC). You can also run/host virtual machine images for different operating systems (Windows/Linux/Mac).

QEMU can use other hypervisors like KVM to use CPU extensions (HVM) for virtualization. When used as a virtualizer, QEMU achieves near-native performance by running guest code directly on the host's CPU. QEMU can take advantage of the operating system's hypervisor capabilities to offload CPU and MMU emulation onto real hardware.

In this tutorial, QEMU for Windows x64 is installed on an x64 PC that is also running Windows Debugger.

(Video) Debugging the Linux Kernel with Qemu and GDB

For information on installing QEMU, refer to the QEMU documentation:https://www.qemu.org/documentacion/

### Configuring a target virtual drive

Browse or create a virtual disk image that contains the software you want to debug.

This example uses a disk image of a Windows x64 VHDX virtual machine. For more information about Windows virtual machine images, seeCreate a Hyper-V Virtual Machine on Windows 10.

### Include VirtIO Drivers in the Windows Image

To enable network functionality and proper storage device performance, include or install the VirtIO drivers in the Windows virtual machine disk image. VirtIo drivers are available here:https://github.com/virtio-win/kvm-guest-drivers-windows

VirtIO is a standardized interface that allows virtual machines to access abstract hardware such as block devices, network adapters, and consoles. Virtio serves as an abstraction layer for hardware devices in a virtualized environment like QEMU.

### Converter VHDX para QEMU

This step is not required but is recommended as better performance is achieved using a native QEMU-QCOW image instead of a VHDX.

Use the following qemu-img.exe command to create the vhdx. For example, this utility is located where you installed QEMUC:\Programa\qemu.

C:\Archivos de programa\qemu> qemu-img convert -c -p -O qcow2 MyVHDXFile.vhdx MyQEMUFile.qcow2

For best results, download or compile the UEFI firmware file (OVMF.fd). Firmware required; otherwise, QEMU emulates older BIOS systems by default.

One UEFI firmware source is the Open Clear Linux project:https://clearlinux.org/

The UEFI exampleOVMF.fdThe file is here:https://github.com/clearlinux/common/blob/master/OVMF.fd

Extract the contents of the downloaded file inC:\Programa\qemu\Firmware.

For platforms other than Intel AMD64, you must build EDK2 firmware. For more information, seehttps://github.com/tianocore/tianocore.github.io/wiki/How-to-build-OVMF.

### Configuring the QEMU startup script

Create your configuration file in QEMU. For example, create aStart QEMUX64Windows.batFile in the QEMU root directory. See the example file below.

#### Use QEMU startup script to start QEMU

Run the QEMU startup script to start QEMU.

c:\Program Files\qemu\StartQEMUx64Windows.bat

If a firewall defense prompt appears, grant the application full rights for all network types to enable windbg through the Windows firewall to the host debugger machine.

Once the Windows virtual machine is started in the QEMU environment, the QEMU UI will appear.

Use CTRL+ALT+ a numeric key combination to enter the QEMU monitor console. This monitor is also available throughVer->compatmonitor.

(Video) Linux Kernel Debugging: Going Beyond Printk Messages

untilservidor gdbto start the GDB front-end server on QEMU.

QEMU should appearWaiting for gdb connection on device "tcp::1234"

Tip: The GDB console window supports the "system_reset" command to quickly reset the emulation. Type help to see a list of GDB console commands.

### Windows QEMU x64 Virtual Machine Startup Script Example

This is an example QEMU configuration script that can be used for AMD64 virtual machines. Replace links pointing to DISK and CD-ROM files with locations on your PC.

REM REM This script is used to run a Windows x64 virtual machine on QEMU hosted on a Windows x64 host system. REM The host system is a PC with an Intel(R) Xeon(R) CPU. REM set EXECUTABLE=qemu-system-x86_64 set MACHINE=-m 6G -smp 4 REM No REM acceleration Generic CPU emulation. REM to find out which CPU types are supported by the version of QEMU on your system, then run: REM qemu-system-x86_64.exe -cpu help REM to see if your host system's CPU is listed. REM set CPU=-machine q35 REM Enable x64 UEFI BIOS used by QEMU: set BIOS=-bios D:\temp\firmware\OVMF.fd REM Use normal GFX simulator set GFX=-device ramfb -device VGA set USB_CTRL=-device usb-ehci,id =usbctrl set KEYB_MOUSE=-device usb-kbd -device usb-tablet REM # The following line enables the full speed HD driver (requires a separate driver) REM # The following line uses the AHCI driver to the virtual disk : set DRIVE0=- device ahci,id=ahci -device ide-hd,drive=disk,bus=ahci.0 REM REM Sets the Windows VM x64 disk image used by QEMU starts REM The disk image is in the qcow2 format accepted by QEMU. REM You will get the .qcow2 image once you get the VHDX Windows VM x64 REM image and apply the script to inject virtio x64 drivers and then REM run the QEMU tool to convert the .VHDX image to .qcow2 REM format, or i.e. REMqemu -img convert -c -p - O qcow2 Windows_VM_VHDX_with_injected_drivers_file.vhdx file.qcow2 REM file : points to the specified qcow2 image path. REM set DISK0=-drive id=disk,file=D:\temp\x64_image_qcow2_for_windows\basex64Client.qcow2,if=none REM REM for kdnet enabled, best option: REM NETWORK0="-netdev user,id=net0,hostfwd=tcp ::53389-:3389,hostfwd=tcp::50001-:50001 -device virtio-net,netdev=net0,disable-legacy=on" REM set NETHOST=-netdev user,id=net0,hostfwd=tcp: : 3589 -:3389 set NETGUEST=-device e1000,netdev=net0 REM # The following line should enable the daemon (instead of Interactive) set DEAMON=-daemonize" %EXECUTABLE% %MACHINE% %CPU% %BIOS% %GFX % % USB_CTRL % %DRIVE0% %DISK0% %NETHOST% %NETGUEST%

## Check network connection

Make sure you get the Windows IP address (if the debugger host session is not on the same Windows machine as the QEMU VM).

If the GDB server starts successfully, you will see the port number the GDB server is listening on and you need to use that port to configure the host debugger (IP:port pair) in exdiConfigData.xml.

If your host debugger is on the same machine hosting the QEMU guest, the localhost identifier in exdiconfigdata.xml will be used as an IP:port pair (for example, LocalHost:Port:1234). In this example with server and host debugger on the same PC, the default values ​​are used.

Set the CurrentTarget attribute value to "QEMU" in the ExdiConfigData.xml file.

If you are working on remote PC, set QEMU destination IP<Address>: porto<Number>where the GDB server is listening:

• Locate the QEMU component tag element in exdiCondifgData.xml.
• Set the IP:Port Number (LocalHost if the debugger is running on the same host as the QEMU virtual machine) for the QEMU GDB server by typing:
• Save the changes to the exdiConfigdata.xml file located in the path specified by the EXDI_GDBSRV_XML_CONFIG_FILE environment variable.

The following commands can be issued from the QEMU console (compatmonitor0) to display network information and connection status.

info redinfo usernet

Install Windows debugging tools on the host system. For information on how to download and install the debugger tools, seeDownload Debugging Tools for Windows.

Download the source code of the corresponding ExdiGdbSrv.dll binary (EXDI COM Server Client) from Microsoft/WinDbg-Samples, GitHubhttps://github.com/microsoft/WinDbg-Samples)

git-Clone https://github.com/microsoft/WinDbg-Samples

Create the VS solution (ExdiGdbSrv.sln) as per the architecture of the host debugger installation located at Exdi/exdigdbsrv.

Locate the ExdiGdbSrv.dll created by the build.

Copy the EXDI COM server (ExdiGdbSrv.dll) to the host machine in the directory containing your debugger, .g.C:\Programa (x86)\Windows Kits\10\Debugger\x64oC:\Debugger)

Use regsvr32 to register the DLL from an administrator command prompt.

C:\Program (x86)\Windows Kits\10\Debuggers\x64>regsvr32 ExdiGdbSrv.dll

RegSvr32 should return a message indicating that theDLLRegisterServer in ExdiGdbSrv.dll successfully.

(Video) How to Debug a Kernel in VS Code

This step only needs to be performed once, but if you change the location of ExdiGdbSrv.dll, you will need to re-register the COM server.

Another option is to use the sample PowerShell script to install the EXDI DLL and launch the debugger for the first time. For more information, seeExample EXDI PowerShell scriptnoConfiguring EXDI debugger transport.

## Configure the debugger host (WinDbg) by editing the EXDI configuration XML files

Locate the two necessary configuration files inWinDbg-Samples/Exdi/exdigdbsrv/and copy it to a local debugger machine on your host where the debugger is installed.

• exdiConfigData.xml
• logs do sistema.xml

EXDI_GDBSRV_XML_CONFIG_FILE – Describes the full path to the EXDI XML configuration file.

EXDI_SYSTEM_REGISTERS_MAP_XML_FILE – Describes the full path to the EXDI system registrations map XML file.

For general information about installing, configuring, and troubleshooting EXDI connections, as well as exdiConfigData.xml tags and attributes, seeConfiguring EXDI debugger transport.

Set the environment variables EXDI_GDBSRV_XML_CONFIG_FILE and EXDI_SYSTEM_REGISTERS_MAP_XML_FILE to describe the full path to the Exdi XML configuration file.

#### system symbol

Open a command prompt and set the following environment variables.

establezca EXDI_GDBSRV_XML_CONFIG_FILE="C:\Arquivos de programas (x86)\Windows Kits\10\Debuggers\x64\exdiConfigData.xml" establezca EXDI_SYSTEM_REGISTERS_MAP_XML_FILE="C:\Program Files (x86)\Windows Kits\10\Debuggers\x64\systemregisters .XML"

untilTO ADJUSTto confirm that the specified path is available in the location of ExdiGdbSrvSample.dll

#### Power Shell

Open a PowerShell prompt and set the following environment variables:

$env:EXDI_GDBSRV_XML_CONFIG_FILE = 'C:\Programa (x86)\Windows Kits\10\Debuggers\x64\exdiConfigData.xml'$env:EXDI_SYSTEM_REGISTERS_MAP_XML_FILE = 'C:\Programa (x86)\Windows Kits\10\Debuggers\ x64\ registros do sistema.xml'

untildir env:to confirm that the specified path is available in the location of ExdiGdbSrvSample.dll

## Start WinDbg on host system

Start the windbg session on the Exdi interface in the same command prompt where you set the environment variables (EXDI_GDBSRV_XML_CONFIG_FILE and EXDI_SYSTEM_REGISTERS_MAP_XML_FILE).

c:\Depuradores> windbg.exe -v -kx exdi:CLSID={29f9906e-9dbe-4d4b-b0fb-6acf7fb6d014},Kd=Rate,DataBreaks=Exdi

To see additional results, the-v:A detailed session can be used. For general information about WinDbg options, seeWinDbg Command Line Options.

Another option is to use the sample PowerShell script to install the EXDI DLL and launch the debugger for the first time. For more information, seeExample EXDI PowerShell script, noConfiguring EXDI debugger transport.

PS>.\Start-ExdiDebugger.ps1 -ExdiTarget "QEMU" -GdbPort 1234 -Architektur x64 -ExdiDropPath "C:\path\to\built\exdi\files"

The debugger must start and connect to the QEMU GdbServer.

The debugger shows successful initialization of the EXDI transport.

EXDI: DBGCOINITIALIZE RETURNED 0X00000001EXDI: COCREATEINSTANCE () RETURN 0X0000000000EXDI: QUARYINTERFACE (IEXDISERVER3) RETURN 0X0000000000 RESPONSABILIDADE DO DESTINO COMANDO: QEMUEXDICMD: A FUNÇÃO: Interface 0x00000000EXDI: Server::GetNbCodeBpAvail() retornou 0x00000000 EXDI: ExdiNotifyRunChange::Initialize() retornou 0x00000000 EXDI : LiveKernelTargetInfo::Initialize() returned 0x00000000 EXDI: Target initialization successful

The Packets window of the EXDIGdbServer console can also display EXDI connection status information if displayCommPackets="yes" is set in the exdiConfigData.xml file. For more information, see the troubleshooting information atConfiguring EXDI debugger transport.

### Use WinDbg to debug the target Windows QEMU image

dbgeng.dll uses a heuristic algorithm to find the NT baseload address position at the time of the interrupt command. If there are no private icons available, this operation will fail.

(Video) Using Serial kdb / kgdb to Debug the Linux Kernel - Douglas Anderson, Google

This means that the interrupt will not work as expected for many connection strings. If you enter the code manually, it's a random location where Windows is running. Since symbols may not be available to target code, it can be difficult to set breakpoints using symbols.

Commands like the following that directly access memory will work.

k, kb, kc, kd, kp, kP, kv (Stack Backtrace anzeigen)

r (Register)

d, da, db, dc, dd, dD, df, dp, dq, du, dw (display memory)

and (Dismount)

And you can step through the code.

p (step)

There are also commands that can be used to try to find the code you want to debug.

s (such speech)

Imgscan can be useful in EDXI debugging because symbol-based breakpoint setting may not be available unlike traditional KDNET-based kernel debugging. Locating a desired target image can make it easier to use its location to set a memory access breakpoint.

### .exdicmd (EXDI command)

.exdicmd sends an EXDI command to the target system using the active EXDI debug connection. For more information, see.exdicmd (EXDI command).

## EXDI XML configuration files

There are two required XML files used by the EXDI GDB COM server (ExdiGdbSrv.dll).

1. exdiConfigData.xml- This file contains key configuration data that the GDB server client needs to establish a successful GDB session with the HW debugger GDB server target, so the GDB server client does not run when the file location isNotdefined by the EXDI_GDBSRV_XML_CONFIG_FILE environment variable. Each XML tag allows configuration of a specific set of GDB server functions. Below is a list of attributes that you can change in the XML and sample XML.

2. Log do sistema.xml- This file contains a mapping between system logs and your passcode. This is necessary because the GDB server does not provide the shortcode in the xml file and the debugger accesses each system record through the shortcode.

For more information and a description of the GDBServer tags and attributes defined in the XML configuration files, seeConfiguring EXDI debugger transport.

## Problems solution

See troubleshooting information atConfiguring EXDI debugger transport.

Configuring EXDI debugger transport

(Video) Debugging Secured Windows OS guest using KVM/QEMU and Windbg - Marek Kędzierski, Red Hat

.exdicmd (EXDI command)

KDNET network kernel debug auto setup

Configure KDNET network kernel debugging manually

## FAQs

### How do I debug Windows kernel driver? ›

1. Section 1: Connect to a kernel-mode WinDbg session.
2. Section 2: kernel-mode debugging commands and techniques.
4. Section 4: Install the Sysvad audio driver on the target system.
5. Section 5: Use WinDbg to display information about the driver.

How to enable kernel debugging Windows 10? ›

Starting the Debugging Session

Open WinDbg as Administrator. On the File menu, choose Kernel Debug. In the Kernel Debugging dialog box, open the Local tab. Select OK.

How do I debug a device driver? ›

Kernel-mode debugging commands and techniques. Download and build the KMDF echo driver. Install the echo driver sample on the target system. Use WinDbg to display information about the driver.

How to use GDB with QEMU? ›

To connect to QEMU's GDB server using your host GDB, you need to create a remote connection. Once you are connected, you can debug your emulated environment like you would debug any other program. Attempts to connect to host hostname on port port. If no hostname is specified, GDB will use localhost.

How do I create a Windows kernel driver? ›

Create and build a driver
1. Open Microsoft Visual Studio. ...
2. In the Create a new project dialog box, select C++ in the left dropdown, choose Windows in the middle dropdown, and choose Driver in the right dropdown.
3. Select Kernel Mode Driver, Empty (KMDF) from the list of project types.
Nov 4, 2022

What is kernel mode debugger? ›

A kernel-mode debugging environment typically has two computers, the host computer and the target computer. The debugger runs on the host computer, and the code being debugged runs on the target computer. The host and target are connected by a debug cable.

Should I enable debugging mode? ›

When Should I Enable a Debug Log? If you have identified an issue occurring on your website during the payment process, enable the debug log to gather some clues as to why it is occurring. It may be as simple as an incorrect email address has been entered.

How do I enable kernel configuration? ›

To configure the kernel, change to /usr/src/linux and enter the command make config. Choose the features you want supported by the kernel. Usually, There are two or three options: y, n, or m. m means that this device will not be compiled directly into the kernel, but loaded as a module.

Should I enable debugging? ›

Background: Trustwave recommends that mobile devices should not be set to USB Debugging mode. When a device is in USB Debugging mode, a computer connected to the device can read all data, run commands, and install or remove apps. The security of the device settings and data could be compromised.

How do I find hidden drivers in Device Manager? ›

For Windows 8 and later: From Start, search for device manager, and select Device Manager from the search results. Troubleshoot the devices and drivers in Device Manager. Note Click Show hidden devices on the View menu in Device Manager before you can see devices that are not connected to the computer.

### How to debug kernel code? ›

Setup
1. Build the kernel with CONFIG_GDB_SCRIPTS enabled, but leave CONFIG_DEBUG_INFO_REDUCED off. ...
2. Install that kernel on the guest, turn off KASLR if necessary by adding “nokaslr” to the kernel command line. ...
3. Enable the gdb stub of QEMU/KVM, either. ...
4. cd /path/to/linux-build.
5. Start gdb: gdb vmlinux. ...
6. Attach to the booted guest:

Which famous function to debug kernel issues? ›

The majority of day to day kernel debugging is done by adding print statements to code by using the famous printk function. This technique is well described in Kernel Debugging Tips. Using printk is a relatively simple, effective and cheap way to find problems.

How to debug using QEMU? ›

Connecting to the DebuggerEdit

The -gdb {device} command-line switch allows you to specify QEMU to wait for a connection in the specified device. It can accept serial, socket, udp, tcp, stdio , etc. E.g. -gdb tcp::9000 to listen on port 9000, then from GDB you can connect to it with target remote localhost:9000 .

How do I use QEMU with UEFI? ›

Creating a VM

On the "Overview" screen, change the "Firmware" field to select the "UEFI x86_64" option. Click "Begin Installation" The boot screen you'll see should use linuxefi commands to boot the installer, and you should be able to run efibootmgr inside that system, to verify that you're running an UEFI OS.

Does QEMU use BIOS or UEFI? ›

Most Qemu software runs BIOS (Legacy) initialization software. In many cases, a user may want to run Qemu with UEFI instead of BIOS.

Why does a Windows driver need to run in kernel mode? ›

Device drivers are able to access privileged functions and have access to stuff userland software is not. That is why they have to be in kernel mode.

What drivers run in kernel mode? ›

WDM Drivers. Windows Driver Model (WDM) drivers are kernel-mode drivers within the Windows operating systems. WDM works by channeling some of the work of the device driver into portions of the code that are integrated into the operating system.

How do I create a Windows bootable boot? ›

To create a bootable USB flash drive
1. Insert a USB flash drive into a running computer.
2. Open a Command Prompt window as an administrator.
3. Type diskpart .
4. In the new command line window that opens, to determine the USB flash drive number or drive letter, at the command prompt, type list disk , and then click ENTER.
May 18, 2022

What is the purpose of kernel mode? ›

Kernel mode refers to the processor mode that enables software to have full and unrestricted access to the system and its resources. The OS kernel and kernel drivers, such as the file system driver, are loaded into protected memory space and operate in this highly privileged kernel mode.

What is the difference between kernel mode and user mode in Windows? ›

In kernel mode, the program has direct and unrestricted access to system resources. In user mode, the application program executes and starts. In user mode, a single process fails if an interrupt occurs. Kernel mode is also known as the master mode, privileged mode, or system mode.

### What is the difference between user mode and kernel mode debugging? ›

When debugging in user mode, you are debugging a single executable, which is separated from other executables by the OS. Kernel debugging is performed on two systems because there is only one kernel; if the kernel is at a breakpoint, no applications can be running on the system.

What are the disadvantages of debugging? ›

Debugging limitations
• Watch expression: Agents are not supported (for instance "agent my_function" is not supported").
• You cannot yet create an instance of SPECIAL.
• The debugger is not very helpful when the execution is stopped inside an invariant.

What is debugging good for? ›

The purpose of debugging is to locate and fix the mistake. The testing process does not help the developer figure out what the coding mistake is -- it simply reveals what effects the coding error has on the program.

What should I enable in developer options? ›

To unhide the Developer options menu:
1. 1 Go to "Settings"
3. 3 Tap “Software information”
4. 4 Tap “Build number” seven times. ...

Which command is used to configure kernel? ›

config file in the root directory of the kernel tree. The configuration file itself can be generated by issuing the make menuconfig command.

Does changing kernel improve performance? ›

Yes, Android custom kernels, also called ROMs, can be applied or updated manually to Android OS to add features, improve performance or change certain parts of the operating system.

Where do I find kernel configuration? ›

The Linux kernel configuration is usually found in the kernel source in the file: /usr/src/linux/. config .

Why is debugging so difficult? ›

So why is debugging so hard? It all comes down to the complexity. Even the simplest apps are built on a huge code foundation. Modern developers get many tools for free — tools they don't really understand.

Should ADB debugging be on or off? ›

Should I have USB debugging on or off? ›

USB debugging is often used by developers or IT support people to connect and transfer data from an Android device to a computer. While this feature is useful, a device isn't as secure when connected to a computer. So that's why some organizations require you to turn this setting off.

### How do I show ghost devices in Device Manager? ›

To include hidden devices in Device Manager display, select View and select Show hidden devices.

How do I see hidden drives? ›

Select the Start button, then select Control Panel > Appearance and Personalization. Select Folder Options, then select the View tab. Under Advanced settings, select Show hidden files, folders, and drives, and then select OK.

How do I connect to a hidden network drive? ›

Windows 10:
1. In the lower-right corner of your screen, click the WiFi icon.
2. Click Network Settings > Wi-Fi > Hidden Network > Connect.
3. Enter the SSID (network name).
4. Click Next.
5. Enter the network security key (password).
6. Click Next. Your computer connects to the network.
Jul 30, 2019

What are the 5 main functions of the kernel? ›

Functions of a kernel include scheduling processes, resource allocation, device management, interrupt handling, memory management, and process management.

What are the 2 types of kernel? ›

Types of Kernel :
• Monolithic Kernel – It is one of types of kernel where all operating system services operate in kernel space. It has dependencies between systems components. ...
• Micro Kernel – It is kernel types which has minimalist approach. ...
• Hybrid Kernel – It is the combination of both monolithic kernel and microkernel.
Dec 22, 2022

Which is the most powerful debugging tool of all? ›

GDB. GDB, GNU project debugger, is an open-source debugging tool for UNIX systems and many programming languages like C, C++, etc. It allows you to perform different tasks using the command line interface.

What are the two types of debugging? ›

There are two types of debugging techniques: reactive debugging and preemptive debugging. Most debugging is reactive — a defect is reported in the application or an error occurs, and the developer tries to find the root cause of the error to fix it.

What are three tools for debugging? ›

Best Debugging Tools include:

Chrome DevTools, Progress Telerik Fiddler, GDB (GNU Debugger), SonarLint, Data Display Debugger, Froglogic Squish, TotalView HPC Debugging Software, Rollbar, and Percepio Tracealyzer.

Can you run Windows 10 in QEMU? ›

Initial setup

Open up the Virtual Machine Manager and click on the upper left button to open the New VM window. The first thing you have to do is to select how you would like to install the operating system. In this case, we are using a Windows 10 ISO image. Click forward and choose the Windows 10 ISO you downloaded.

What is QEMU and why is it used? ›

QEMU is a machine emulator that can run operating systems and programs for one machine on a different machine. However, it is more often used as a virtualiser in collaboration with KVM kernel components. In that case it uses the hardware virtualisation technology to virtualise guests.

### What BIOS does QEMU use? ›

QEMU uses the PC BIOS from the Seabios project and the Plex86/Bochs LGPL VGA BIOS.

What hardware does QEMU emulate? ›

Admins looking for an alternative tool for emulating hardware should consider QEMU, which supports x86, PowerPC, ARM and SPARC architectures. QEMU is an open source emulator and virtualization tool that specializes in emulating different CPU architectures.

Does QEMU have a BIOS? ›

SeaBIOS also runs inside an emulator; it is the default BIOS for the QEMU and KVM virtualization environments, and can be used with the Bochs emulator.

Should I boot BIOS or UEFI? ›

In general, install Windows using the newer UEFI mode, as it includes more security features than the legacy BIOS mode. If you're booting from a network that only supports BIOS, you'll need to boot to legacy BIOS mode. After Windows is installed, the device boots automatically using the same mode it was installed with.

Which is better BIOS or UEFI? ›

The primary purpose of creating UEFI was to overcome the limitations of BIOS and shorten system boot time. UEFI uses the GPT partitioning scheme and supports much greater drive sizes. In addition, UEFI provides better security with the Secure Boot feature, preventing unauthorized apps from booting.

Can QEMU be detected? ›

Hence, Qemu can be easily detected using this approach. This code, run in a kernel module (MSRs can only be accessed in privileged mode), should result in a general protection fault. Executed on real hardware (Intel Pentium 4 and Intel Core 2 Duo), it behaves as expected.

How do I fix my Windows kernel? ›

How to Fix the Kernel Security Check Failure Error
1. Update to the Latest Released Version of Windows 10.
2. Update Drivers that Need to be Updated.
3. Check for Viruses.
4. Investigate Possible Corrupted Windows File System.
5. Test to see if Disabling Antivirus Software Fixes the Issue.
6. Investigate Possible Issues with RAM.
Sep 14, 2022

How do I reset my Windows kernel? ›

To get started, press Windows Key +I to open Settings, then head to Update & Security > Recovery > Get Started. From there, click on Remove Everything and follow the instructions ahead for a smooth reset. After the reset, Windows 10 will reinstall with the files and drivers that came from the manufacturer.

How do I fix Windows kernel modification detected? ›

The best solution for resolving this issue is to use the most recent stable build of Windows 10. Unenroll from the program: On your PC, go to Settings > Update & Security > Windows Insider Program, select “Stop Insider Preview Builds” and follow the additional on-screen prompts.

How do I enable debug logs in kernel? ›

You can do this by setting the kernel log level at boot time via a kernel command line option. See the "loglevel=" argument in Documentation/kernel-parameters. txt. You can turn off all messages using the kernel command line option "quiet".

### What causes kernel failure? ›

The most likely cause is faulty software. A kernel panic can also be caused by damaged or incompatible hardware, including external devices attached to your Mac. If the kernel panic is caused by a known problem, the faulty software is identified.

What happens if a kernel mode driver crashes? ›

If a kernel-mode driver crashes, the entire operating system crashes.

How do I force reset my computer from BIOS? ›

To perform system recovery from the BIOS:
1. Power on or restart the workstation.
2. Enter the BIOS by tapping either the right or left bottom of the screen.
3. Tap Advanced, and then tap Special Configuration.
4. Tap Factory Recovery.
5. Select Enabled from drop-down menu.
6. Tap Home.
7. Tap Save and Exit.

How do I reset Windows UEFI? ›

1. Navigate to the Settings tab under your Start menu by clicking the gear icon.
2. Click the Update & Security option and select Recovery from the left sidebar.
3. You should see a Restart now option below the Advanced Setup heading, click this whenever you're ready.
Oct 10, 2019

How do I force a Windows computer to factory reset? ›

To reset your PC, go to Start > Settings > Update & Security > Recovery > Reset this PC > Get Started. Then, select Keep my files, choose cloud or local, change your settings, and set Restore preinstalled apps? to No.

## Videos

1. Windows securekernel live debugging
(Gerhart X)
2. Debugging a Linux Kernel Module and a User Process with a TRACE32 JTAG Debugger
(Lauterbach GmbH)
3. ARM DS-5 Debugger Linux kernel debug example with DSTREAM and BeagleBoard setup
(Arm®)
4. Linux Kernel Debug using ARM DS-5 Altera Edition
(Intel FPGA)
5. Aleksandr Bulyshchenko - Linux Kernel Debugging
(GlobalLogicUkraine)
6. Breaking VSM by Attacking SecureKernel
(Black Hat)
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