• Jason Wessel's avatar
    kgdb: core changes to support kdb · dcc78711
    Jason Wessel authored
    These are the minimum changes to the kgdb core in order to enable an
    API to connect a new front end (kdb) to the debug core.
    
    This patch introduces the dbg_kdb_mode variable controls where the
    user level I/O is routed.  It will be routed to the gdbstub (kgdb) or
    to the kdb front end which is a simple shell available over the kgdboc
    connection.
    
    You can switch back and forth between kdb or the gdb stub mode of
    operation dynamically.  From gdb stub mode you can blindly type
    "$3#33", or from the kdb mode you can enter "kgdb" to switch to the
    gdb stub.
    
    The logic in the debug core depends on kdb to look for the typical gdb
    connection sequences and return immediately with KGDB_PASS_EVENT if a
    gdb serial command sequence is detected.  That should allow a
    reasonably seamless transition between kdb -> gdb without leaving the
    kernel exception state.  The two gdb serial queries that kdb is
    responsible for detecting are the "?" and "qSupported" packets.
    
    CC: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
    Acked-by: default avatarMartin Hicks <mort@sgi.com>
    dcc78711
kgdb.c 5.69 KB