• Jason Wessel's avatar
    mips,kgdb: kdb low level trap catch and stack trace · 5dd11d5d
    Jason Wessel authored
    The only way the debugger can handle a trap in inside rcu_lock,
    notify_die, or atomic_notifier_call_chain without a recursive fault is
    to have a low level "first opportunity handler" do_trap_or_bp() handler.
    Generally this will be something the vast majority of folks will not
    need, but for those who need it, it is added as a kernel .config
    option called KGDB_LOW_LEVEL_TRAP.
    Also added was a die notification for oops such that kdb can catch an
    oops for analysis.
    There appeared to be no obvious way to pass the struct pt_regs from
    the original exception back to the stack back tracer, so a special
    case was added to show_stack() for when kdb is active because you
    generally desire to generally look at the back trace of the original
    Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
    Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
Kconfig.kgdb 2.35 KB