Add .zero directive

src/asm/mod.rs

@@ -95,6 +95,8 @@ pub enum Directive {
     Word(u32),
     /// .quad value
     Quad(u64),
+    /// .zero bytes
+    Zero(usize),
 }
 
 impl Directive {

src/asm/write_asm.rs

@@ -87,6 +87,7 @@ impl WriteString for Directive {
             Self::Half(value) => format!(".half\t{:#x?}", value),
             Self::Word(value) => format!(".word\t{:#x?}", value),
             Self::Quad(value) => format!(".quad\t{:#x?}", value),
+            Self::Zero(bytes) => format!(".zero\t{:#x?}", bytes),
         }
     }
 }