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Procedure for debugging of OEM protocols on Linux/RaspberryPI platforms


  • Disable the autostart of the KOM process (in the process configuration using CNF) and turn off the KOM process (using Sysconsole).

  • Modify the Makefile for the OEM protocol and add the "-g" flag to it so that the compiler includes debugging information. Example: change from
    CFLAGS= -I ../h
    to
    CFLAGS=-g -I ../h

  • Recompile the OEM protocol and copy the resulting library to the protdll directory:
    cd /home/d2000/oem
    rm template.o template.so

    make
    cp template.so /opt/d2000/protdll/oem_prot11.so

  • In the directory where the source codes of the OEM protocol are, start the debugger and set the breakpoint to a specific line/lines in the OEM protocol (e.g. within the Init or ReadAllPoints procedure)
    Confirm "y" that you want to activate the breakpoint when loading future shared libraries.
    cd /home/d2000/oem
    gdb /opt/d2000/bin/kom

    (gdb) break template.c:73
    No symbol table is loaded. Use the "file" command.
    Make breakpoint pending on future shared library load? (y or [n]) y

  • Start the KOM process (the /F0 parameter  is used to turn off the watchdog)
    run /F0

  • The debugger stops on the specified line of the OEM protocol source line:
    [Switching to Thread 0x72f161a0 (LWP 3369)]
    Thread 14 "S204b" hit Breakpoint 1, ReadAllPoints (St=0x75847580)
    at template.c:73
    73 template.c: Permission denied.
    (gdb) bt
    #0 ReadAllPoints (St=0x75847580) at template.c:73
    #1 0x00eb00b0 in ?? ()
    #2 0x006ae364 in ?? ()
    Backtrace stopped: previous frame identical to this frame (corrupt stack?)

  • Continue debugging with the standard gdb debugger commands.

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