By Sreekrishnan Venkateswaran
Debugging Linux Systems discusses the most instruments on hand at the present time to debug 2.6 Linux Kernels. we begin through exploring the possible esoteric operations of the Kernel Debugger (KDB), Kernel GNU DeBugger (KGDB), the apparent GNU DeBugger (GDB), and JTAG debuggers. We then examine Kernel Probes, a characteristic that allows you to interfere right into a kernel functionality and extract debug details or practice a medicated patch. interpreting a crash unload can yield clues for postmortem research of kernel crashes or hangs, so we look at Kdump, a serviceability software that collects a approach 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 program profiler to experience the presence of code bottlenecks. simply because tracing offers perception into behavioral difficulties that occur in the course of interactions among diversified 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 more often than not chanced on on embedded undefined, resembling flash reminiscence, serial port, PCMCIA, safe electronic media, USB, RTC, audio, video, contact display, and Bluetooth, and offers tips to debug the linked machine drivers. We additionally decide up a few board-level debugging abilities with assistance from a case examine. The part “Debugging community Throughput” takes you thru a few equipment driving force layout concerns and protocol implementation features that could have an effect on the horsepower of your community interface card. We finish the shortcut by way of interpreting numerous innovations to be had within the kernel configuration menu which can emit worthwhile debug information.
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Rights and Contracts Department 501 Boylston Street, Suite 900 Boston, MA 02116 Fax: (617) 671-3447 ISBN-13: 978-0-136-12354-5 ISBN-10: 0-136-12354-6 First release, November 2009 2 Debugging Linux Systems (Digital Shortcut) � 2010 Pearson Education. All rights reserved. by Sreekrishnan Venkateswaran This publication is protected by copyright. Please see page 2 for more details. 6 Linux Kernels. We start by exploring the seemingly esoteric operations of the Kernel Debugger (KDB), Kernel GNU DeBugger (KGDB), the plain GNU DeBugger (GDB), and JTAG debuggers.
Please see page 2 for more details. 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).
Com SECTION #1 Kernel Debuggers functions on x86-based systems. But 0xab does not look like a valid kernel address! Fix the bug by allocating valid memory space to my_-variable, recompile, and continue your testing. JTAG Debuggers JTAG debuggers use hardware-assist to debug code. You need specialized monitor hardware3and a front-end user interface (some JTAG debuggers use gdb as the front-end) to step through code. JTAG can also be used for purposes other than debugging, such as burning code onto onboard flash memory.
Debugging Linux Systems by Sreekrishnan Venkateswaran
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