By Sreekrishnan Venkateswaran

Debugging Linux Systems discusses the most instruments to be had this present day to debug 2.6 Linux Kernels. we begin by way of exploring the likely esoteric operations of the Kernel Debugger (KDB), Kernel GNU DeBugger (KGDB), the obvious GNU DeBugger (GDB), and JTAG debuggers. We then examine Kernel Probes, a function that allows you to intervene right into a kernel functionality and extract debug info or observe a medicated patch. interpreting a crash sell off can yield clues for postmortem research of kernel crashes or hangs, so we look at Kdump, a serviceability software that collects a procedure sell off after spawning a brand new kernel. Profiling issues you to code areas that burn extra CPU cycles, so we learn how to use the OProfile kernel profiler and the gprof software profiler to feel the presence of code bottlenecks. simply because tracing presents perception into behavioral difficulties that happen in the course of interactions among assorted code modules, we delve into the Linux hint Toolkit, a approach designed for high-volume hint capture.

 

The part “Debugging Embedded Linux” takes a travel of the I/O interfaces normally came upon on embedded undefined, reminiscent of flash reminiscence, serial port, PCMCIA, safe electronic media, USB, RTC, audio, video, contact monitor, and Bluetooth, and gives tips that could debug the linked gadget drivers. We additionally decide up a few board-level debugging talents with the aid of a case examine. The part “Debugging community Throughput” takes you thru a few machine driving force layout concerns and protocol implementation features which could have an effect on the horsepower of your community interface card. We finish the shortcut by way of studying numerous ideas to be had within the kernel configuration menu that may emit priceless debug information.

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By Sreekrishnan Venkateswaran This publication is protected by copyright. Please see page 2 for more details. Com SECTION #2 Kernel Probes 00000000 : 0: 55 push %ebp 1: bd 00 40 00 00 mov $0x4000,%ebp 6: 57 push %edi 7: 56 push %esi 8: 53 push %ebx 9: bb 00 f0 ff ff mov $0xfffff000,%ebx e: 81 ec 90 00 00 00 sub $0x90,%esp ... 7a: 83 f8 0a cmp $0xa,%eax → Point A ptg5994185 7d: 74 2b je aa 7f: 83 f8 09 cmp $0x9,%eax 82: 75 cc jne 50 ... a9: c3 ret aa: a1 00 00 00 00 mov 0x0,%eax → Point B af: 85 c0 test %eax,%eax b1: 0f 8e b5 00 00 00 jle 16c b7: 81 fd 7b f6 00 00 cmp $0xf67b,%ebp ...

25 ptg5994185 Kexec and Kdump . . . . . . . . . . . . 41 Sreekrishnan Venkateswaran Profiling. . . . . . . . . . . . . . . . . . . 54 Tracing. . . . . . . . . . . . . . . . . . . . 61 Debugging Embedded Linux. . . . 67 Debugging Network Throughput. . . . . . . . . . . . . . . . 83 Linux Test Project. . . . . . . . . . . . 86 User Mode Linux . . . . . . . . . . . . . 87 Diagnostic Tools .

Com Kernel Debuggers Investing time in logic design and software engineering before code development and staring hard at the code after development can minimize or even eliminate bugs. But because that is easier said than done, and because we are all humans, developers need debugging tools. In this shortcut, let’s explore a variety of methods to debug kernel code. The techniques described here have been stitched together from different parts of the book Essential Linux Device Drivers (Prentice Hall Open Source Software Development Series, ISBN 978-0-132-39655-4).

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