rv2fox: Understand .zero directive

gcc/rv2fox

@@ -68,6 +68,13 @@ class Emitter:
         for d in data:
             self.write(f'data.{size} {d}')
 
+    def zero(self, *data):
+        """
+        Emit zeros
+        """
+        for d in data:
+            self.write(f'data.fill 0, {d}')
+
     def strz(self, *data):
         """
         Emit null-terminated string
@@ -183,6 +190,8 @@ class Converter:
             pass # ignore
         elif m := re.fullmatch(r'word\s+([^\s]+)', line):
             self.e.data(*m.groups())
+        elif m := re.fullmatch(r'zero\s+([^\s]+)', line):
+            self.e.zero(*m.groups())
         elif m := re.fullmatch(r'string\s+\"(.*)\"', line):
             self.e.strz(*m.groups())
         elif m := re.fullmatch(r'asciz\s+\"(.*)\"', line):