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authorJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:25 -0500
committerJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:25 -0500
commitf503b5ae53cb557ac351a668fcac1baab1cef0db (patch)
treeb2deb02cec90cb18a075b3a49e6de949db374c77 /lib
parent98ec1878cacb393975cba64f7392eece81716cb4 (diff)
downloadlinux-2.6.34-ux500-f503b5ae53cb557ac351a668fcac1baab1cef0db.tar.gz
x86,kgdb: Add low level debug hook
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.kgdb9
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index ee8ae7132f2..c56ccb4ad29 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -57,6 +57,15 @@ config KGDB_TESTS_BOOT_STRING
information about other strings you could use beyond the
default of V1F100.
+config KGDB_LOW_LEVEL_TRAP
+ bool "KGDB: Allow debugging with traps in notifiers"
+ depends on X86
+ default n
+ help
+ This will add an extra call back to kgdb for the breakpoint
+ exception handler on which will will allow kgdb to step
+ through a notify handler.
+
config KGDB_KDB
bool "KGDB_KDB: include kdb frontend for kgdb"
default n