Add debugger entry points for BLACKFIN

This patch series adds an export which can be set by system debuggers to direct the hard lockup and soft lockup detector to trigger a breakpoint exception and enter a debugger if one is active. It is assumed that if someone sets this variable, then an breakpoint handler of some sort will be actively loaded or registered via the notify die handler chain.

This addition is extremely useful for debugging hard and soft lockups real time and quickly from a console debugger.

---
 arch/blackfin/include/asm/kdebug.h | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 arch/blackfin/include/asm/kdebug.h

new file mode 100644
index 0000000..288c425
@@ -0,0 +1,5 @@
+
+static inline void arch_breakpoint(void)
+{
+	asm("EXCPT 2;");
+}

1.8.3.1