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Debugging with GDB

The GNU Source-Level Debugger

Ninth Edition, for GDB version

Richard Stallman, Roland Pesch, Stan Shebs, et al.


On DOS/Windows systems, the home directory is the one pointed to by the HOME environment variable.


Note that embedded programs (the so-called "free-standing" environment) are not required to have a main function as the entry point. They could even have multiple entry points.


The only restriction is that your editor (say ex), recognizes the following command-line syntax:

ex +number file

The optional numeric value +number specifies the number of the line in the file where to start editing.


`b' cannot be used because these format letters are also used with the x command, where `b' stands for "byte"; see section Examining memory.


This is a way of removing one word from the stack, on machines where stacks grow downward in memory (most machines, nowadays). This assumes that the innermost stack frame is selected; setting $sp is not allowed when other stack frames are selected. To pop entire frames off the stack, regardless of machine architecture, use return; see section Returning from a function.


If you choose a port number that conflicts with another service, gdbserver prints an error message and exits.


In `gdb-' of the version release.


If you have a more recent version of GDB than, look at the `README' file in the sources; we may have improved the installation procedures since publishing this manual.

This document was generated on 18 May 2008 using the texi2html translator version 1.51.