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    Subject[PATCH 09/17] arm,kgdb: Add ability to trap into debugger on notify_die
    Date
    Now that ARM implements the notify die handlers, add the ability for
    the kernel debugger to receive the notifications.

    Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
    CC: Russell King <linux@arm.linux.org.uk>
    CC: linux-arm-kernel@lists.infradead.org
    ---
    arch/arm/kernel/kgdb.c | 34 ++++++++++++++++++++++++++++++++++
    1 files changed, 34 insertions(+), 0 deletions(-)

    diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
    index cf846ca..778c2f7 100644
    --- a/arch/arm/kernel/kgdb.c
    +++ b/arch/arm/kernel/kgdb.c
    @@ -10,6 +10,7 @@
    * Deepak Saxena <dsaxena@plexity.net>
    */
    #include <linux/irq.h>
    +#include <linux/kdebug.h>
    #include <linux/kgdb.h>
    #include <asm/traps.h>

    @@ -180,6 +181,33 @@ void kgdb_roundup_cpus(unsigned long flags)
    local_irq_disable();
    }

    +static int __kgdb_notify(struct die_args *args, unsigned long cmd)
    +{
    + struct pt_regs *regs = args->regs;
    +
    + if (kgdb_handle_exception(1, args->signr, cmd, regs))
    + return NOTIFY_DONE;
    + return NOTIFY_STOP;
    +}
    +static int
    +kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
    +{
    + unsigned long flags;
    + int ret;
    +
    + local_irq_save(flags);
    + ret = __kgdb_notify(ptr, cmd);
    + local_irq_restore(flags);
    +
    + return ret;
    +}
    +
    +static struct notifier_block kgdb_notifier = {
    + .notifier_call = kgdb_notify,
    + .priority = -INT_MAX,
    +};
    +
    +
    /**
    * kgdb_arch_init - Perform any architecture specific initalization.
    *
    @@ -188,6 +216,11 @@ void kgdb_roundup_cpus(unsigned long flags)
    */
    int kgdb_arch_init(void)
    {
    + int ret = register_die_notifier(&kgdb_notifier);
    +
    + if (ret != 0)
    + return ret;
    +
    register_undef_hook(&kgdb_brkpt_hook);
    register_undef_hook(&kgdb_compiled_brkpt_hook);

    @@ -204,6 +237,7 @@ void kgdb_arch_exit(void)
    {
    unregister_undef_hook(&kgdb_brkpt_hook);
    unregister_undef_hook(&kgdb_compiled_brkpt_hook);
    + unregister_die_notifier(&kgdb_notifier);
    }

    /*
    --
    1.6.3.3


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