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>

4 files changed, 37 insertions, 2 deletions

diff --git a/arch/mips/include/asm/kgdb.h b/arch/mips/include/asm/kgdb.h
index 48223b09396c..19002d605ac4 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__ */
 
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,
 };
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index d612c6dcb746..950bde8813fc 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -26,6 +26,7 @@
 #include <linux/kgdb.h>
 #include <linux/kdebug.h>
 #include <linux/notifier.h>
+#include <linux/kdb.h>
 
 #include <asm/bootinfo.h>
 #include <asm/branch.h>
@@ -185,6 +186,11 @@ void show_stack(struct task_struct *task, unsigned long *sp)
                         regs.regs[29] = task->thread.reg29;
                         regs.regs[31] = 0;
                         regs.cp0_epc = task->thread.reg31;
+#ifdef CONFIG_KGDB_KDB
+                } else if (atomic_read(&kgdb_active) != -1 &&
+                           kdb_current_regs) {
+                        memcpy(&regs, kdb_current_regs, sizeof(regs));
+#endif /* CONFIG_KGDB_KDB */
                 } else {
                         prepare_frametrace(&regs);
                 }
@@ -360,6 +366,8 @@ void __noreturn die(const char * str, struct pt_regs * regs)
         unsigned long dvpret = dvpe();
 #endif /* CONFIG_MIPS_MT_SMTC */
 
+        notify_die(DIE_OOPS, str, (struct pt_regs *)regs, SIGSEGV, 0, 0);
+
         console_verbose();
         spin_lock_irq(&die_lock);
         bust_spinlocks(1);
@@ -704,6 +712,11 @@ static void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
         siginfo_t info;
         char b[40];
 
+#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
+        if (kgdb_ll_trap(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
+                return;
+#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
+
         if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP)
                 return;
 
diff --git a/lib/Kconfig.kgdb b/lib/Kconfig.kgdb
index c56ccb4ad292..43cb93fa2651 100644
--- a/lib/Kconfig.kgdb
+++ b/lib/Kconfig.kgdb
@@ -59,7 +59,7 @@ config KGDB_TESTS_BOOT_STRING
 
 config KGDB_LOW_LEVEL_TRAP
        bool "KGDB: Allow debugging with traps in notifiers"
-       depends on X86
+       depends on X86 || MIPS
        default n
        help
          This will add an extra call back to kgdb for the breakpoint