Implement Turmit.bin_xor + add stack size limit

gte/turmit.py

@@ -137,6 +137,7 @@ class Turmit(object):
         if new_sz < 2:
             new_sz = 2
         stksz = len(self._stack)
+        new_sz %= 0xFFF
         if new_sz > stksz:
             self._stack += [ 0 for _ in range(new_sz - stksz) ]
         elif new_sz < stksz:
@@ -217,6 +218,15 @@ class Turmit(object):
         '''
         return a | b
 
+    @RpnOp
+    def bin_xor(self, a, b):
+        ''' @brief Binary xor
+            @param a int : value
+            @param b int : value
+            @return a ^ b
+        '''
+        return a ^ b
+
     @RpnOp
     def pop(self, a):
         ''' @brief Pops a, head of the stack