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Arcom Embedded Linux Technical Manual Developing software for AEL

Debugging applications on the target

The AEL host environment includes the GNU Debugger (GDB). GDB enables you to

control the execution of your application, examine program state and view the

application code. GDB is a symbolic debugger. This means that you can debug your

application using the function and variable names that were used in the source code.

The main GDB application binary is automatically installed on your host system as part

of the host environment. The recommended method of debugging target applications

using GDB is over an Ethernet connection using the gdbserver utility, which is present

on the target by default.

It is possible to run GDB directly on the target board by installing the GDB package from

the Development Kit CD. We do not recommend this because GDB is relatively large

and memory-hungry. Furthermore, you would not benefit from full symbolic debugging

as your application source code is not available on the target.

This section describes the basics of how you can use GDB to debug an application

running on a remote target. Please consult the GDB manual for more information about

using GDB. The manual is available on the Development Kit CD in /manuals/gdb.pdf, or

from the GDB website at www.gnu.org/software/gdb

Compiling an application for debugging

Before you can debug a program using the full symbolic information, you must compile

and link the application with full symbolic information. This is done by adding the –g

option to both compile and link commands. For example, to compile a simple hello

world application, enter the following:

$ arm-linux-gcc –g –o hello hello.c

Once compiled, copy the binary to your target system using scp:

$ scp hello [email protected]:/tmp/hello

It is possible to debug optimized programs with GDB, but you may find that

optimizations such as those performed when using the –O2 option interfere with GDB’s

understanding of program flow and variable location. We recommend that you disable

optimizations in your application while you are debugging it either by using –O0 or by

leaving out the –O options all together.

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Eurotech ZEUS Manual de usuario Pagina 42