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x86,kgdb: Add low level debug hook

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The only way the debugger can handle a trap in inside rcu_lock,
notify_die, or atomic_notifier_call_chain without a triple fault is
to have a low level "first opportunity handler" in the int3 exception
handler.

Generally this will be something the vast majority of folks will not
need, but for those who need it, it is added as a kernel .config
option called KGDB_LOW_LEVEL_TRAP.

CC: Ingo Molnar <mingo@elte.hu>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: H. Peter Anvin <hpa@zytor.com>
CC: x86@kernel.org
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jason Wessel 2010-05-20 21:04:25 -05:00
parent 98ec1878ca
commit f503b5ae53
6 changed files with 41 additions and 2 deletions
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2
kernel/debug/debug_core.c
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@ -66,7 +66,7 @@ int kgdb_connected;
EXPORT_SYMBOL_GPL(kgdb_connected);
/* All the KGDB handlers are installed */
static int kgdb_io_module_registered;
int kgdb_io_module_registered;
/* Guard for recursive entry */
static int exception_level;