powerpc/kgdb: Bail out of KGDB when we've been triggered

We need to skip a breakpoint exception when it occurs after
a breakpoint has already been removed.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index bbabc5abb1c4..05adb69febf4 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -101,6 +101,21 @@ static int computeSignal(unsigned int tt)
         return SIGHUP;          /* default for things we don't know about */
 }
 
+/**
+ *
+ *      kgdb_skipexception - Bail out of KGDB when we've been triggered.
+ *      @exception: Exception vector number
+ *      @regs: Current &struct pt_regs.
+ *
+ *      On some architectures we need to skip a breakpoint exception when
+ *      it occurs after a breakpoint has been removed.
+ *
+ */
+int kgdb_skipexception(int exception, struct pt_regs *regs)
+{
+        return kgdb_isremovedbreak(regs->nip);
+}
+
 static int kgdb_call_nmi_hook(struct pt_regs *regs)
 {
         kgdb_nmicallback(raw_smp_processor_id(), regs);