ARM: Adding a bogus fault that does nothing.

This fault can used to flush the pipe, not including the faulting instruction.

The particular case I needed this was for a self-modifying code. It needed to
drain the store queue and force the following instruction to refetch from
icache. DCCMVAC cp15 mcr instruction is modified to raise this fault.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/arch/arm/faults.hh b/src/arch/arm/faults.hh
index 7dd881435..3eef0e551 100644
--- a/src/arch/arm/faults.hh
+++ b/src/arch/arm/faults.hh
@@ -227,6 +227,14 @@ class DataAbort : public AbortFault<DataAbort>
 class Interrupt : public ArmFaultVals<Interrupt> {};
 class FastInterrupt : public ArmFaultVals<FastInterrupt> {};
 
+// A fault that flushes the pipe, excluding the faulting instructions
+class FlushPipe : public ArmFaultVals<FlushPipe>
+{
+  public:
+    FlushPipe() {}
+    void invoke(ThreadContext *tc);
+};
+
 static inline Fault genMachineCheckFault()
 {
     return new Reset();