X86: On a bad microopc, return a microop that returns a fault that panics.

This way a bad micropc will have to get all the way to commit before killing
the simulation. This accounts for misspeculated branches.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/arch/x86/microcode_rom.hh b/src/arch/x86/microcode_rom.hh
index f8ad410ce..84c503bb9 100644
--- a/src/arch/x86/microcode_rom.hh
+++ b/src/arch/x86/microcode_rom.hh
@@ -32,6 +32,7 @@
 #define __ARCH_X86_MICROCODE_ROM_HH__
 
 #include "arch/x86/emulenv.hh"
+#include "arch/x86/insts/badmicroop.hh"
 #include "cpu/static_inst.hh"
 
 namespace X86ISAInst
@@ -60,8 +61,10 @@ namespace X86ISAInst
         fetchMicroop(MicroPC microPC, StaticInstPtr curMacroop)
         {
             microPC = normalMicroPC(microPC);
-            assert(microPC < numMicroops);
-            return genFuncs[microPC](curMacroop);
+            if (microPC >= numMicroops)
+                return X86ISA::badMicroop;
+            else
+                return genFuncs[microPC](curMacroop);
         }
     };
 }