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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 <jason.wessel@windriver.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: linux-arm-kernel@lists.infradead.org
This commit is contained in:
Jason Wessel 2010-08-05 09:22:22 -05:00
parent 6d855b1d83
commit 62a0309c4c
1 changed files with 34 additions and 0 deletions
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34
arch/arm/kernel/kgdb.c
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@ -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);
}
/*