diff -r b69773a3290a -r 2994d86da4b7 src/arch/arm/isa/formats/branch.isa
--- a/src/arch/arm/isa/formats/branch.isa	Fri Aug 13 11:55:23 2010 -0500
+++ b/src/arch/arm/isa/formats/branch.isa	Fri Aug 13 11:56:38 2010 -0500
@@ -196,11 +196,14 @@
                           case 0x2:
                             return new Clrex(machInst);
                           case 0x4:
-                            return new WarnUnimplemented("dsb", machInst);
+                            //return new WarnUnimplemented("dsb", machInst);
+                            return new Dsb(machInst);
                           case 0x5:
-                            return new WarnUnimplemented("dmb", machInst);
+                            //return new WarnUnimplemented("dmb", machInst);
+                            return new Dmb(machInst);
                           case 0x6:
-                            return new WarnUnimplemented("isb", machInst);
+                            //return new WarnUnimplemented("isb", machInst);
+                            return new Isb(machInst);
                           default:
                             break;
                         }
diff -r b69773a3290a -r 2994d86da4b7 src/arch/arm/isa/formats/uncond.isa
--- a/src/arch/arm/isa/formats/uncond.isa	Fri Aug 13 11:55:23 2010 -0500
+++ b/src/arch/arm/isa/formats/uncond.isa	Fri Aug 13 11:56:38 2010 -0500
@@ -99,11 +99,14 @@
                       case 0x1:
                         return new Clrex(machInst);
                       case 0x4:
-                        return new WarnUnimplemented("dsb", machInst);
+                        //return new WarnUnimplemented("dsb", machInst);
+                        return new Dsb(machInst);
                       case 0x5:
-                        return new WarnUnimplemented("dmb", machInst);
+                        //return new WarnUnimplemented("dmb", machInst);
+                        return new Dmb(machInst);
                       case 0x6:
-                        return new WarnUnimplemented("isb", machInst);
+                        //return new WarnUnimplemented("isb", machInst);
+                        return new Isb(machInst);
                     }
                 }
             } else if (bits(op2, 0) == 0) {
diff -r b69773a3290a -r 2994d86da4b7 src/arch/arm/isa/insts/misc.isa
--- a/src/arch/arm/isa/insts/misc.isa	Fri Aug 13 11:55:23 2010 -0500
+++ b/src/arch/arm/isa/insts/misc.isa	Fri Aug 13 11:56:38 2010 -0500
@@ -677,6 +677,33 @@
     decoder_output += BasicConstructor.subst(clrexIop)
     exec_output += PredOpExecute.subst(clrexIop)
 
+    isbCode = '''
+    '''
+    isbIop = InstObjParams("isb", "Isb", "PredOp",
+                             {"code": isbCode,
+                               "predicate_test": predicateTest}, ['IsSerializing'])
+    header_output += BasicDeclare.subst(isbIop)
+    decoder_output += BasicConstructor.subst(isbIop)
+    exec_output += PredOpExecute.subst(isbIop)
+
+    dsbCode = '''
+    '''
+    dsbIop = InstObjParams("dsb", "Dsb", "PredOp",
+                             {"code": dsbCode,
+                               "predicate_test": predicateTest},['IsMemBarrier'])
+    header_output += BasicDeclare.subst(dsbIop)
+    decoder_output += BasicConstructor.subst(dsbIop)
+    exec_output += PredOpExecute.subst(dsbIop)
+
+    dmbCode = '''
+    '''
+    dmbIop = InstObjParams("dmb", "Dmb", "PredOp",
+                             {"code": dmbCode,
+                               "predicate_test": predicateTest},['IsMemBarrier'])
+    header_output += BasicDeclare.subst(dmbIop)
+    decoder_output += BasicConstructor.subst(dmbIop)
+    exec_output += PredOpExecute.subst(dmbIop)
+
     cpsCode = '''
     uint32_t mode = bits(imm, 4, 0);
     uint32_t f = bits(imm, 5);