Auto link multiple applications in kernel.

user/src/bin/power.rs

@@ -0,0 +1,27 @@
+#![no_std]
+#![no_main]
+
+#[macro_use]
+extern crate user_lib;
+
+const SIZE: usize = 10;
+const P: u32 = 3;
+const STEP: usize = 10000000;
+const MOD: u32 = 10007;
+
+#[no_mangle]
+fn main() -> i32 {
+    let mut pow = [0u32; SIZE];
+    let mut index: usize = 0;
+    pow[index] = 1;
+    for i in 1..=STEP {
+        let last = pow[index];
+        index = (index + 1) % SIZE;
+        pow[index] = last * P % MOD;
+        if i % 10000 == 0 {
+            println!("{}^{}={}", P, i, pow[index]);
+        }
+    }
+    println!("Test power OK!");
+    0
+}