path: root/arch/mips/include
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authorJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:26 -0500
committerJason Wessel <jason.wessel@windriver.com>2010-05-20 21:04:26 -0500
commit5dd11d5d47d248850c58292513f0e164ba98b01e (patch)
treefd3c5f27dd40d6a483483de3644ca060a5cafd75 /arch/mips/include
parentba797b28131b1f1367b662936ea370239d603cff (diff)
mips,kgdb: kdb low level trap catch and stack trace
The only way the debugger can handle a trap in inside rcu_lock, notify_die, or atomic_notifier_call_chain without a recursive fault is to have a low level "first opportunity handler" do_trap_or_bp() 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. Also added was a die notification for oops such that kdb can catch an oops for analysis. There appeared to be no obvious way to pass the struct pt_regs from the original exception back to the stack back tracer, so a special case was added to show_stack() for when kdb is active because you generally desire to generally look at the back trace of the original exception. Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Acked-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include')
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/include/asm/kgdb.h b/arch/mips/include/asm/kgdb.h
index 48223b09396..19002d605ac 100644
--- a/arch/mips/include/asm/kgdb.h
+++ b/arch/mips/include/asm/kgdb.h
@@ -38,6 +38,8 @@ extern int kgdb_early_setup;
extern void *saved_vectors[32];
extern void handle_exception(struct pt_regs *regs);
extern void breakinst(void);
+extern int kgdb_ll_trap(int cmd, const char *str,
+ struct pt_regs *regs, long err, int trap, int sig);
#endif /* __KERNEL__ */