Auto link multiple applications in kernel.

os/build.rs

@@ -20,13 +20,30 @@ fn insert_app_data() -> Result<()> {
         })
         .collect();
 
+    writeln!(f, r#"
+    .align 4
+    .section .data
+    .global _num_app
+_num_app:
+    .quad {}
+    "#, apps.len())?;
+
+    for i in 0..apps.len() {
+        writeln!(f, r#"
+    .quad app_{}_start
+        "#, i)?;
+    }
+    writeln!(f, r#"
+    .quad app_{}_end
+    "#, apps.len() - 1)?;
+
     for (idx, app_with_extension) in apps.iter().enumerate() {
         writeln!(f, r#"
     .section .data
     .global app_{0}_start
     .global app_{0}_end
 app_{0}_start:
-    .incbin "{2}{1}"
+    .incbin "{2}{1}.bin"
 app_{0}_end:
         "#, idx, app_with_extension, TARGET_PATH)?;
     }