From 62a0309c4c99274052e4829ed6a8fe579dd2c767 Mon Sep 17 00:00:00 2001 From: Jason Wessel Date: Thu, 5 Aug 2010 09:22:22 -0500 Subject: [PATCH] arm,kgdb: Add ability to trap into debugger on notify_die Now that ARM implements the notify die handlers, add the ability for the kernel debugger to receive the notifications. Signed-off-by: Jason Wessel CC: Russell King CC: linux-arm-kernel@lists.infradead.org --- arch/arm/kernel/kgdb.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c index cf846cade354..778c2f7024ff 100644 --- a/arch/arm/kernel/kgdb.c +++ b/arch/arm/kernel/kgdb.c @@ -10,6 +10,7 @@ * Deepak Saxena */ #include +#include #include #include @@ -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); } /* -- 2.20.1