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From: Jason Wessel on 5 Aug 2010 10:50
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(a)windriver.com>
CC: Russell King <linux(a)arm.linux.org.uk>
CC: linux-arm-kernel(a)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(a)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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Prev: [PATCH 17/17] debug_core,kdb: fix crash when arch does not have single step
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