GDB

On this page you will find all you need to debug your userspace applications running on your Armadeus board.

First of all, be sure to have installed the Toolchain on your Host.

Compile your program with debug symbols

• Use -g option of gcc:

 $ make shell_env
 $ . armadeus_env.sh
 $ export PATH=$PATH:$ARMADEUS_TOOLCHAIN_PATH

 $ arm-linux-gcc -g -o hello hello.c

• If you have a Makefile for your project, you probably have a CFLAGS variable, so add it -g. Ex:

CFLAGS=-W -Wall -g

Debugging a program running on your APF, from your Host, through Ethernet

• On the target launch your program like that:

 # gdbserver 192.168.0.2:2345 program [args]

192.168.0.2 is the IP address of your Host and 2345 the port number to use (examples).

• On your Host launch:

 []$ arm-linux-gdb program
 (gdb) set solib-absolute-prefix ./buildroot/build_armv4t/staging_dir/
 (gdb) target remote 192.168.0.10:2345

192.168.0.10 is the address of your target

only continue (c) can be used to start the program, because it is already running when you launch GDB on your host.

Core dump analysis doesn't seem to work in this use case !!

Debugging directly on your APF (may require more memory)

• You have to build gdb for the target:

 $ make menuconfig

Toolchain  --->
        *** Gdb Options ***
    [*] Build gdb debugger for the Target

 $ make

Then you can either reflash your rootfs, or copy $ARMADEUS_ROOTFS_DIR/bin/gdb to your board, to a SD or to a NFS export.

• After installation, launch gdb on your APF:

 # gdb your_prog

If you need argument passing:

 # gdb --args your_prog your_args

To debug a Core dump:

 # gdb your_prog -c your_core_file

Links

• Debugging with GDB manual
• http://www.kegel.com/linux/gdbserver.html
• Déboguage avec gdb
• DDD (GDB graphical front end)
• KGDB (for kernel debugging)

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