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author | Jason Wessel <jason.wessel@windriver.com> | 2010-05-20 21:04:26 -0500 |
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committer | Jason Wessel <jason.wessel@windriver.com> | 2010-05-20 21:04:26 -0500 |
commit | 5dd11d5d47d248850c58292513f0e164ba98b01e (patch) | |
tree | fd3c5f27dd40d6a483483de3644ca060a5cafd75 /arch/mips/kernel/kgdb.c | |
parent | ba797b28131b1f1367b662936ea370239d603cff (diff) | |
download | linux-stable-5dd11d5d47d248850c58292513f0e164ba98b01e.tar.gz linux-stable-5dd11d5d47d248850c58292513f0e164ba98b01e.tar.bz2 linux-stable-5dd11d5d47d248850c58292513f0e164ba98b01e.zip |
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/kernel/kgdb.c')
-rw-r--r-- | arch/mips/kernel/kgdb.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c index 6ed4c83c869b..9b78ff6e9b84 100644 --- a/arch/mips/kernel/kgdb.c +++ b/arch/mips/kernel/kgdb.c @@ -203,7 +203,7 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd, if (atomic_read(&kgdb_active) != -1) kgdb_nmicallback(smp_processor_id(), regs); - if (kgdb_handle_exception(trap, compute_signal(trap), 0, regs)) + if (kgdb_handle_exception(trap, compute_signal(trap), cmd, regs)) return NOTIFY_DONE; if (atomic_read(&kgdb_setting_breakpoint)) @@ -217,6 +217,26 @@ static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd, return NOTIFY_STOP; } +#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP +int kgdb_ll_trap(int cmd, const char *str, + struct pt_regs *regs, long err, int trap, int sig) +{ + struct die_args args = { + .regs = regs, + .str = str, + .err = err, + .trapnr = trap, + .signr = sig, + + }; + + if (!kgdb_io_module_registered) + return NOTIFY_DONE; + + return kgdb_mips_notify(NULL, cmd, &args); +} +#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */ + static struct notifier_block kgdb_notifier = { .notifier_call = kgdb_mips_notify, }; |