动态链接库+修复神秘光标问题

cleonos/c/apps/libdemo_main.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+typedef unsigned long long u64;
+
+u64 cleonos_libdemo_add(u64 left, u64 right) {
+    return left + right;
+}
+
+u64 cleonos_libdemo_mul(u64 left, u64 right) {
+    return left * right;
+}
+
+u64 cleonos_libdemo_hello(void) {
+    (void)puts("[libdemo] hello from libdemo.elf");
+    return 0ULL;
+}
+
+int cleonos_app_main(int argc, char **argv, char **envp) {
+    (void)argc;
+    (void)argv;
+    (void)envp;
+    (void)puts("[libdemo] dynamic library image ready");
+    return 0;
+}