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Commit 62a0309c authored by Jason Wessel's avatar Jason Wessel
Browse files

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: default avatarJason Wessel <jason.wessel@windriver.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: linux-arm-kernel@lists.infradead.org
parent 6d855b1d

arch/arm/kernel/kgdb.c

+34 −0
Original line number Diff line number Diff line
@@ -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);

}



/*