In this guide, we will identify some possible causes that may cause Linux kdb kernel debugging, and then we will suggest possible solutions to this problem.
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The kernel has several different debugging interfaces (kdb, for example, kgdb) thatDebugging interface. You can also useDebugging interfaces and dynamic conversion between them when youCorrectly configure any kernel at compile time and at run time.
Kdb is a lightweight, shell-style front end that can be used on the system.Keyboard console or serial console. You can use it to checkMemory, connections, process lists, dmesg, even predefined breakpointsstop in a certain position. However, Kdb is not a source code debugger.You can set breakpoints and then do some basic kernel checks at runtime. customerprimarily aimed at fulfilling certainanalyzes to help clarify orDiagnosing problems with the kernel. You can access multiple symbol names fromBuilt into the kernel with kernel modules if the code was built with
Kgdb is on its way to becoming the default game debugger for Linux.basic. It is used along with gdb to debug the Linux kernel.It is expected that gdb can be used to crack the kernel.Check memory space, variables and view call location informationSimilar to how a device developer uses gdb for debuggingApplication. Is it possible to set breakpoints in kernel code andperform a few limited execution steps.
Kgdb uses two machines. One of these passenger carsDesign and machine, everything else is the target machine. The kernel also debugsbe is running on this target computer. Transformer controlsgdb instance for my vmlinux file which contains themes (notboot image like bzImage, zImage, uImage…). In gdb developergives my connection setting and connection time for kgdb. ViewThe connection that the developer supportslives with gdb, volume dependentCompiled kgdb I/O modules, such as kernel builtins or loadable modules next totest the kernel of the machine.
Building The Kernel¶
Kernel Configuration Options Via Kgdb¶
CONFIG_KGDB you must appear below and choose.
Although vmlinux does not require icons.The file gdb will never be very useful without this symbolic data, so youwill want to let you include
CONFIG_DEBUG_INFO which is actually called in the settings menu.
Scrolling is motivating but not required
CONFIG_FRAME_POINTER The kernel option is now called in the configuration gallery. This option inserts codein your compiled executable, which stores system information, or insaves the load in different places, allowing a trusted debuggerlike gdb to build the stack trace more correctly, whiledebug someone’s kernel.
If usingWhich architecture supports the kernel option
CONFIG_STRICT_KERNEL_RWX, someone needs to disable it. itThe option prevents the use of PC software breakpoints as it signalsSome areas of the kernel are read-only. If kgdbsupports it for the architecture you are using, you can embed the hardwareBreakpoints if you want to use
CONFIG_STRICT_KERNEL_RWXOption enabled, other things you need to disable this type of option.
Then you need to select one that connects to multiple I/O drivers to connect debug.host and debug target optional. Early shoe debugging requires KGDB I/OA driver that aborts debugging and must be integrated into the driverkernel directly. The configuration of the Kgdb I/O driver is done viaKernel or module settings, where you can now learn more about how it worksSection describing the kgdboc parameter.
Here is an example of a passphrase associated with
.config characters to enable or disable kgdb:
#CONFIG_STRICT_KERNEL_RWX not definedCONFIG_FRAME_POINTER=yCONFIG_KGDB=yCONFIG_KGDB_SERIAL_CONSOLE=y
Kdb Kernel Tuning Suggestions
Kdb is a bit more complex than the simple and lightweight gdbstub above.most kernel debugging programs. Kdb should also implement and add sensitive wrappersome assistants serve in other parts of the core, in charge ofPrint interesting data types as if you were looking at them
ps. To build kdb in any kernel, follow the instructionssame steps as for clients for kgdb.
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