Merge pull request #123 from riscv/debug_interrupts

Don't take interrupts while in Debug Mode.

riscv/processor.cc

@@ -174,7 +174,7 @@ void processor_t::take_interrupt(reg_t pending_interrupts)
   if (enabled_interrupts == 0)
     enabled_interrupts = pending_interrupts & state.mideleg & -s_enabled;
 
-  if (enabled_interrupts)
+  if (state.dcsr.cause == 0 && enabled_interrupts)
     throw trap_t(((reg_t)1 << (max_xlen-1)) | ctz(enabled_interrupts));
 }