GDB is a debugger program used to test and debug other programs. It allows the user to step through a program line-by-line, set breakpoints, view variable values and more. Some key features of GDB include setting breakpoints, running and stopping a program at specific points, examining variable values and execution flow. GDB can also be used for remote debugging where the program runs on one machine and GDB runs on another, connected machine.
When the debugging of modern software is required, basic GDB techniques are insufficient, but new techniques can be created from the nearly 160 commands available in GDB. "Modern software" refers to multi-threading, using STL and other libraries, IPC, signals and exception
mechanisms. In this lecture, techniques for debugging large, modern software written in C++ will be explained.
When the debugging of modern software is required, basic GDB techniques are insufficient, but new techniques can be created from the nearly 160 commands available in GDB. "Modern software" refers to multi-threading, using STL and other libraries, IPC, signals and exception
mechanisms. In this lecture, techniques for debugging large, modern software written in C++ will be explained.
go programming language basics
This presentation is a copy of one of the presentation in the slideshare
i just walk through the basic side of go programming language
its about a 45 mins presentation
more details about this language you get from golang.org refer this link
An Introduction to Makefile.
about 23 slides to present you a quick start to the make utility, its usage and working principles. Some tips/examples in order to understand and write your own
Makefiles.
In this presentation you will learn why this utility continues to hold its top position in project build software, despite many younger competitors.
Visit Do you know Magazine : https://www.facebook.com/douknowmagazine
Often called as the Swiss Army Knife of Embedded Linux, BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. It is written with size-optimization
and limited resources in mind. Here is a presentation that details about BusyBox.
Title: Working Remotely (via SSH) Rocks!
Intro: Consistent & Persistent development environment from any location any client.
"SSH + TMUX + CLI" Rocks!
Nice material about "SSH Tunneling": http://www.slideshare.net/osoco/ssh-tunneling-recipes-10284950
Improving awareness pescador san diego air & space museumAPLICwebmaster
Presentation by Katrina Pescador
The San Diego Air & Space Museum houses one of the largest and most comprehensive collections of aerospace related materials in the world. The collection includes books, documents, films, photos, periodicals, manuals, drawings, and other archival materials. Over the past several years, the Museum has reviewed and revised its processes for cataloging, organizing, and digitizing these collections, as well as improving connectivity. The Museum adopted national cataloging standards and practice, insured consistency for the various types of materials, developed digitizing standards and procedures, and made other changes to improve both productivity and efficiency. The digitization project allows for greater public access to the collection and assures the materials will be preserved for future use. By making these resources more accessible to researchers through a variety of online services, digitization has dramatically enhanced worldwide awareness of the Museum’s collection.
go programming language basics
This presentation is a copy of one of the presentation in the slideshare
i just walk through the basic side of go programming language
its about a 45 mins presentation
more details about this language you get from golang.org refer this link
An Introduction to Makefile.
about 23 slides to present you a quick start to the make utility, its usage and working principles. Some tips/examples in order to understand and write your own
Makefiles.
In this presentation you will learn why this utility continues to hold its top position in project build software, despite many younger competitors.
Visit Do you know Magazine : https://www.facebook.com/douknowmagazine
Often called as the Swiss Army Knife of Embedded Linux, BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. It is written with size-optimization
and limited resources in mind. Here is a presentation that details about BusyBox.
Title: Working Remotely (via SSH) Rocks!
Intro: Consistent & Persistent development environment from any location any client.
"SSH + TMUX + CLI" Rocks!
Nice material about "SSH Tunneling": http://www.slideshare.net/osoco/ssh-tunneling-recipes-10284950
Improving awareness pescador san diego air & space museumAPLICwebmaster
Presentation by Katrina Pescador
The San Diego Air & Space Museum houses one of the largest and most comprehensive collections of aerospace related materials in the world. The collection includes books, documents, films, photos, periodicals, manuals, drawings, and other archival materials. Over the past several years, the Museum has reviewed and revised its processes for cataloging, organizing, and digitizing these collections, as well as improving connectivity. The Museum adopted national cataloging standards and practice, insured consistency for the various types of materials, developed digitizing standards and procedures, and made other changes to improve both productivity and efficiency. The digitization project allows for greater public access to the collection and assures the materials will be preserved for future use. By making these resources more accessible to researchers through a variety of online services, digitization has dramatically enhanced worldwide awareness of the Museum’s collection.
APLIC 2014 - Building a Technical Knowledge Hub: Applying library science to ...APLICwebmaster
Sarah Burns discusses the development and implementation of Pathfinder’s technical knowledge hub; from conception to systematic integration into all projects and programs. Presented as a case study, the session will showcase all of the steps involved in creating the hub, including, but not limited to, taxonomy creation, SharePoint library development, and the ever-so-important change management activities conducted.
The processor-memory bandwidth in modern generation
processors is the important bottleneck due to a number of
processor cores dealing it through with the same bus/ processor-
memory interface. Caches take a significant amount
of energy in current microprocessors. To design an energyefficient
microprocessor, it is important to optimize cache
energy economic consumption. Powerful utilization of this
resource is consequently an important view of memory hierarchy
design of multi core processors. This is presently an
important field of research on a large number of research
issues that have suggested a number of techniques to figure
out the problem. The better contribution of this theme is the
assessment of effectiveness of some of the proficiencies that
were enforced in recent chip multiprocessors. Cache optimization
techniques that were named for single core processors
but have not been implemented in multi core processors
are as well tested to forecast their effectiveness.
Establishing applications on on-demand infrastructures rather of building applica-tions on fixed and rigid infrastructures was provided by cloud computing provides. By merely exploiting into the cloud, initiatives can gain fast access to business applications or infrastructure resources with decreased Capital Expenditure (CAPEX). The more and more information is placed into the cloud by someone and initiatives, security issues begins to develop and raised. This paper discusses the different security issues that rise up about how secure the mo-bile cloud computing environment.
We believed thatWeb services facilitate application to appli-cation interaction over the Internet. However, clients have no state-of-art on how Web services should be implemented. Service vendors promote services concerned about the value added services that are based on SOAP, it is a W3C standard and ideal technology, while a few, but local developers claim that a simpler approach, called REST, is often more acceptable. In this paper, we investigate the fundamental support of SOAP as well as REST. Furthermore, we cover the relevance of SOAP and REST in different domains.
Sharing Promising Practices Internally and Externally: Lessons Learned from PCIAPLICwebmaster
In this session, Janine Schooley, PCI Senior Vice President, Programs, demonstrates how Project Concern International’s ‘Leveraging Knowledge’ and related strategic directions have utilized various approaches such as Chatter, InnovAtion, and regional workshops this past year to share promising practices and lessons learned both internally and externally for optimal efficiency, effectiveness, thought leadership, and performance.
Allison Long and Julia Cleaver of Ipas report on setting up a Sharepoint deployment that people will actually use - within a large, multinational organization with varying levels of bandwidth / accessibility.
APLIC 2014 - Social Observatories Coordinating NetworkAPLICwebmaster
NSF project looks to define social science research for the 21st century. The major objective of the SOCN is to continue exploration of ideas regarding the potential form and functioning of such a network of social observatories and to actively engage individuals and groups across the SBE research community in this process.
Adding value : the foundation on which to build communityAPLICwebmaster
Joe Matthews presents a session based on his book about adding value. The premise of the book is really quite simple. First, the concept of adding value is bandied about in the management, marketing, and strategic planning literature but is rarely broken down and discussed so that anyone can really understand the concept and, more importantly, learn how they can add value in the work that they do. Second, change is all around us and affects us as individuals mightily and in our libraries, museum, galleries, and archives in some pretty significant ways. In addition, many observers believe that the rate of change is accelerating which is also a cause for concern. So perhaps it would be prudent to explore what forces in our society, and in the field of information technology specifically, are impacting our lives and our treasured institutions of libraries, museums, galleries and archives and discover how organizations need to change in order to add value for their customers.
Presenters : Libbie Stephenson, Jared Lyle
This session discusses the value of and methods for curating data, especially in light of recent government and academic initiatives. Special attention will be paid to data management plans.
Terra Populus: Integrated Data on Population and EnvironmentAPLICwebmaster
Terra Populus is an NSF-funded DataNet project that seeks to lower the barriers for conducting human-environment interactions research. TerraPop provides access to hundreds of census and survey microdata samples, area-level data describing geographic units, and environmental data, commonly stored as raster data, describing land use, land cover, and climate. The data access system adds value to these data by supporting transformations across microdata, area-level data, and raster data. Users may select variables of interest from any of the three formats and obtain output in their desired format. This presentation will provide an overview of the data available in the TerraPop data access system and the system’s transformation functionality, as well as a demonstration of the data access system.
The GNU Debugger, usually called just GDB it is a portable debugger that runs on many Unix-like systems and works for many programming languages, including Ada, C, C++, Objective-C, Free Pascal, Fortran, Java and partially others
Bugs happen. Identifying and fixing them is part of the development process. This tutorial demonstrates one of the key tools in the embedded Linux developer’s toolbox: the GNU Debugger, GDB.
You will begin by using GDB to debug a program running on a target device. You will learn about debug symbols: how build them into programs and libraries, and the places that GDB will go looking for them. Next, you will perform basic debugging tasks, including setting breakpoints, stepping through code, examining variables and modifying variables. After that you will lean about GDB command files and how they can help you by automating certain tasks. You will receive a handy GDB cribsheet to help you with all of this. If time allows, we will discuss how to use GDB to analyse core dumps so that you can perform a post-mortem on a crashed program
PyBay 2019 talk by Lisa Roach.
Use the GDB python extensions to write custom GDB commands in python and build a tool to inject code into a running Python process to analyze its memory usage.
At the event was discussed what the developer can use to repair an application or a game if it has graphic display problems. Also, speakers gave an overview of the Mesa library and its development process.
This presentation by Vadym Shovkoplias and Andrew Khulap (Senior Software Engineers, Consultants, GlobalLogic), was delivered at GlobalLogic Kharkiv Embedded TechTalk #2 on June 4, 2018.
Video: https://youtu.be/pT1Y81KGHkM
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
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CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
1. GNU DEBUGGER / GDB
OPERATING SYSTEMS
AGH UNIVERSITY SCIENCE AND TECHNOLOGY
2. What is Debugger?
• A debugger is a program that is used to test and debug
other programs.
There are many ways to do debugging such as
• printing out messages to the screen using a debugger
• just thinking about what the program is doing and
making an educated guess as to what the problem is.
3. WHAT IS DEBUGGER?
• Step by step running of program
• Stopping debugging when
program encounter a breakpoint
• Tracking values of variables.
• Debugging while program is
running.
Debuggers
have
functions
like
4. BASIC FUNCTIONS OF DEBUGGER
• To learn which statement or expression causes a error
• To specify which line/lines contains error
• To learn the instant values of variables at particular point during
execution of program.
• To learn result of program at particular point
• To learn execution sequence of statements in a program.
5. What is GDB?
GNU Debugger which is also known as GDB is debugger for GNU operating system
that provides to see and distunguish the errors inside of computer program while
the program executes.
6. History of GDB
• Written by Richard Stallman
in 1986.
• Developed by John Gilmore
between 1990 and 1993.
• Now maintained by GDB
Steering Committee which is
part of Free Software
Foundation.
Mascot of GDB
7. FEATURES OF GDB
GDB has mainly 4 functionality to find bugs in program
• GDB can specify any thread in program which might affect program’s
behavior
• User can monitor and modify values of programs’ variables
• GDB can be stop your program in specific conditions.
• GDB can check and analyze all program when program stops.
• GDB can correct bugs in program after detecting it.
8. USAGE AREAS OF GDB
• GDB is not only used in GNU operating system but also use like
portable debugger which runs Unix-like systems. GDB can run on
UNIX and Microsoft Windows systems
GDB Works for
• Ada
• C++
• C
• Objective C
• Pascal languages
9. TECHNICAL DETAILS
Main Target Processors of GDB
• Alpha
• ARM
• AVR
• H8/300
• System/370
• System/390
• x86 / x86-64
• Motorola 68000
• PowerPC
• GDB is actively developing and
New versions are releasing
periodically. With version 7.0
It supports ‘reverse
debugging’.
• Reverse debugging in gdb
means gdb can allow you to
"step" or "continue" your
program backward in time,
reverting it to an earlier
execution state.
10. REMOTE DEBUGGING
Remote operation is when GDB runs on one machine and the program being
debugged runs on another.
• For example, you might use remote debugging on an operating system
kernel or on a another system which does not have a general purpose
operating system powerful enough to run a full featured debugger.
If you want to remote debugging there are 5 stages that you can do
1. Connecting: Connecting to a remote target
2. File Transfer: Sending files to a remote system
3. Server: Using the gdbserver program
4. Remote Configuration: Remote configuration
5. Remote Stub: Implementing a remote stub
11. REMOTE DEBUGGING
1. Connecting
GDB can communicate with the target over a serial line, or over an IP network
using TCP or UDP. In each case, gdb uses the same protocol for debugging your
program.The target remote command establishes a connection to the target.
For example, to connect to port 8080 on a terminal server named webpages:
target remote webpages:8080
Disconnecting:
The disconnect command disconnects the connection with remote target. After
this command gdb is free to connect another target.
12. REMOTE DEBUGGING
2. File Transfer
Commands for sending to remote system:
remote put hostfile targetfile:
Copy file hostfile from the host system to targetfile on the target system.
remote get targetfile hostfile:
Copy file targetfile from the target system to hostfile on the host system.
remote delete targetfile:
Delete targetfile from the target system.
13. REMOTE DEBUGGING
3. Server
• gdbserver is a control program for Unix-like systems, which allows you to
connect your program with a remote gdb via target remote but without
linking in the usual debugging stub.
• To use the server, you must tell it how to communicate with gdb; the
name of your program; and the arguments for your program. The usual
syntax is:
target> gdbserver comm program [ args ... ]
14. REMOTE DEBUGGING
4. Remote Configuration
Remote Configuration commands show configuration options available when
debugging remote programs.
set remoteaddresssize bits:
Set the maximum size of address in a memory packet to the specified number of
bits.
show remoteaddresssize:
Show the current value of remote address size in bits.
15. REMOTE DEBUGGING
• 5. Remote Stub
• The stub files provided with gdb implement the target side of the communication protocol, and
the gdb side is implemented in the gdb source file for example in remote.c
• The debugging stub is specific to the architecture of the remote machine; for example, use
sparc-stub.c to debug programs on sparc boards.
• These working remote stubs are distributed with gdb:
• i386-stub.c
• For Intel 386 and compatible architectures.
• m68k-stub.c
• For Motorola 680x0 architectures.
16. FEATURES OF GDB
GDB uses command line interface.
GDB has 3 feature which are commonly used:
1. Compiling
2. Invoking and Quitting GDB
3. Commands
17. COMPILING
To prepare program for
debugging with gdb, it must be
compiled it with the -g flag. So,
if your program is in a source
file called gizem.cpp and you
want to put the executable in
the file gizem;
$ g++ -g gizem.cpp
$ gdb ./a.out
$ (gdb) run
18. GCC’s C++ Compiler
The g++ compiler accepts both single-letter options, such as -o, and
multiletter options, such as -ansi. Because it accepts both types of options
you cannot group multiple single-letter options together, as you may be
used to doing in many GNU and Unix/Linux programs.
• For example, the multiletter option -pg is not the same as the two
single-letter options -p -g. The -pg option creates extra code in the final
binary that outputs profile information for the GNU code profiler, gprof.
On the other hand, the -p -g options generate extra code in the resulting
binary that produces profiling information for use by the prof code
profiler (-p) and causes gcc to generate debugging information using the
operating system’s normal format (-g).
19. COMPILING AND RUNNING PROGRAM
C++ CODE EXAMPLE
• $ g++ -g gizem.cpp:
Command for compiling source file. Invoke g++ passing name of the source file.
–g flag used in order to include appropriate debug information on the binary
generated.
• $ gdb ./a.out:
Result on Linux and Unix systems generates executable file named a.out in the
current directory. We can execute this executable file by typing ./a.out
• $ (gdb) run:
You can run the program by typing run. Program runs with current arguments.
20. GCC’s C++ Compiler
Despite its sensitivity to the grouping of multiple single-letter options, you are generally free to
mix the order of options and compiler arguments on the gcc command line.
$ g++ example.cpp -g –o example = $ g++ -g –o gcc example.cpp example
• g++: compiler is for c++ language.
• example.cpp: Source file name of c++ code
• -g: Flag of Compiling for given source file
• -o: Flag for specifying the name of the output file. The executable will be named a.out unless you
use this option.
• example: Output file name
./example
This command used to execute output of compiled program. After executing this code output of
program can be seen.
21. COMPILING C CODE
• Compiling a single source file, add.c, using gcc is easy—just invoke gcc, passing the
name of the source file as the argument.
$ gcc add.c
$ ./a.out
• To define the name of output file that gcc produces, -o option can be used as in c++
mode.
$gcc add.c –o output
$./output
• If you are compiling multiple source files using gcc, you can simply specify them all on
the gcc command line, as in the following example, which leaves the compiled and
linked executable in the file named addition.
$gcc add.c helper.c –o addition
./addition
23. Debugging
Debugging program named
broken.cpp with logical error:
After completing compile and
execute processes of program in
order to start to debugger using
output file named broken:
$ gdb broken
To set breakpoint at specific line
we can use b command and
number of line
(gdb) b 43
24. Debugging
• After setting breakpoints, we start to run program in debugger with;
(gdb) run
• Now program runs and ask us for input after entering inputs of program,
program execution stops at first breakpoint.
25. Debugging
• If we want to investigate function’s inside where program stopped executing at
breakpoint, we can step into function’s inside with
(gdb) step
• Program controls it’s first statement of the function ComputeSeriesValue (x=2,
n=3)
26. Debugging
• To continue to debug program we can
use some specific commands such as
(gdb) next
• Next command is similar to step
command except it will step over
functions and also we can use n and s
instead of next and step respectively.
(gdb) n
(gdb) s
• If the command is simply a repeat of the
previous command, you can just hit
return, which will execute the last
command.
(gdb)
27. Debugging
• If you want to know where you are in the program's execution you
can view the contents of the stack using the backtrace command.
(gdb) bt
28. Debugging
• We can step through the program and examine the values using the print
command.
• The print command reveals that the value of fact variable never
changes. Note that the function is returning a value of 0 for the
function call ComputeFactorial(number=0). This is an ERROR.
29. Debugging program with Floating Point exception
error
After debugging program and executing it we see that program has
floating point exception error.
30. Debugging program with Floating Point exception
error
This means problems occur in line 17 and in return a/b expression.
31. Invoking and Quitting GDB
To start gdb, just type gdb at the unix prompt. Gdb will give you a prompt that
looks like this:
We can quit GDB using quit command
(gdb) quit
32. COMMANDS
• Help
• File
• Run
• Break
• Delete
• Clear
• Continue
• Step
• Next
• Until
• List
• print
A debugger is a program that runs other programs, allowing its user to exercise some degree ofcontrol over these programs, and to examine them when things go amiss.
GDB is free software released under the GNU General Public License (GPL). It was modeled after the DBX debugger, which came with Berkeley Unix distributions.
GDBoffers us remotemodewhich is mostlyused in debuggingembeddedsystem.
Host system: (themachinerunninggdb)
set remoteaddresssize bits:gdb will mask off the address bits above that number, when it passes addresses to the remote target. The default value is the number of bits in the target's address
then you would compile with the following command:
(If we'd used next, it would have stepped over ComputeFactorial.)