diff --git a/src/arch/arm/isa/decoder/thumb.isa b/src/arch/arm/isa/decoder/thumb.isa
index 1518b04ea..aec9ebdfc 100644
--- a/src/arch/arm/isa/decoder/thumb.isa
+++ b/src/arch/arm/isa/decoder/thumb.isa
@@ -90,16 +90,7 @@
                 0xe, 0xf: WarnUnimpl::blx(); //register
             }
             0x2, 0x3: WarnUnimpl::ldr();
-            default: decode TOPCODE_11_9 {
-                0x0: WarnUnimpl::str(); //register
-                0x1: WarnUnimpl::strh(); //register
-                0x2: WarnUnimpl::strb(); //register
-                0x3: WarnUnimpl::ldrsb(); //register
-                0x4: WarnUnimpl::ldr(); //register
-                0x5: WarnUnimpl::ldrh(); //register
-                0x6: WarnUnimpl::ldrb(); //register
-                0x7: WarnUnimpl::ldrsh(); //register
-            }
+            default: Thumb16MemReg::thumb16MemReg();
         }
         0x3: decode TOPCODE_12_11 {
             0x0: WarnUnimpl::str(); //immediate, thumb
diff --git a/src/arch/arm/isa/formats/mem.isa b/src/arch/arm/isa/formats/mem.isa
index bc3c1f720..1602997dd 100644
--- a/src/arch/arm/isa/formats/mem.isa
+++ b/src/arch/arm/isa/formats/mem.isa
@@ -358,6 +358,46 @@ def format Thumb32StoreSingle() {{
     decode_block = decode % classNames
 }};
 
+def format Thumb16MemReg() {{
+    decode = '''
+    {
+        const uint32_t opb = bits(machInst, 11, 9);
+        const uint32_t rt = bits(machInst, 2, 0);
+        const uint32_t rn = bits(machInst, 5, 3);
+        const uint32_t rm = bits(machInst, 8, 6);
+        switch (opb) {
+          case 0x0:
+            return new %(str)s(machInst, rt, rn, true, 0, LSL, rm);
+          case 0x1:
+            return new %(strh)s(machInst, rt, rn, true, 0, LSL, rm);
+          case 0x2:
+            return new %(strb)s(machInst, rt, rn, true, 0, LSL, rm);
+          case 0x3:
+            return new %(ldrsb)s(machInst, rt, rn, true, 0, LSL, rm);
+          case 0x4:
+            return new %(ldr)s(machInst, rt, rn, true, 0, LSL, rm);
+          case 0x5:
+            return new %(ldrh)s(machInst, rt, rn, true, 0, LSL, rm);
+          case 0x6:
+            return new %(ldrb)s(machInst, rt, rn, true, 0, LSL, rm);
+          case 0x7:
+            return new %(ldrsh)s(machInst, rt, rn, true, 0, LSL, rm);
+        }
+    }
+    '''
+    classNames = {
+        "str" : storeRegClassName(False, True, False),
+        "strh" : storeRegClassName(False, True, False, size=2),
+        "strb" : storeRegClassName(False, True, False, size=1),
+        "ldrsb" : loadRegClassName(False, True, False, sign=True, size=1),
+        "ldr" : loadRegClassName(False, True, False),
+        "ldrh" : loadRegClassName(False, True, False, size=2),
+        "ldrb" : loadRegClassName(False, True, False, size=1),
+        "ldrsh" : loadRegClassName(False, True, False, sign=True, size=2),
+    }
+    decode_block = decode % classNames
+}};
+
 def format ArmLoadMemory(memacc_code, ea_code = {{ EA = Rn + disp; }},
                      mem_flags = [], inst_flags = []) {{
     ea_code = ArmGenericCodeSubs(ea_code)