diff --git a/.gitignore b/.gitignore
index 30805dd4..c4e93345 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .idea/*
 os/target/*
 os/.idea/*
+os/src/link_app.S
 user/target/*
-user/.idea/*
+user/.idea/*
\ No newline at end of file
diff --git a/os/build.rs b/os/build.rs
new file mode 100644
index 00000000..925ec8af
--- /dev/null
+++ b/os/build.rs
@@ -0,0 +1,34 @@
+use std::io::{Result, Write};
+use std::fs::{File, read_dir};
+
+fn main() {
+    println!("cargo:rerun-if-changed=../user");
+    insert_app_data().unwrap();
+}
+
+static TARGET_PATH: &'static str = "../user/target/riscv64gc-unknown-none-elf/release/";
+
+fn insert_app_data() -> Result<()> {
+    let mut f = File::create("src/link_app.S").unwrap();
+    let apps: Vec<_> = read_dir("../user/src/bin")
+        .unwrap()
+        .into_iter()
+        .map(|dir_entry| {
+            let mut name_with_ext = dir_entry.unwrap().file_name().into_string().unwrap();
+            name_with_ext.drain(name_with_ext.find('.').unwrap()..name_with_ext.len());
+            name_with_ext
+        })
+        .collect();
+
+    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}"
+app_{0}_end:
+        "#, idx, app_with_extension, TARGET_PATH)?;
+    }
+    Ok(())
+}
\ No newline at end of file
diff --git a/os/src/main.rs b/os/src/main.rs
index ebdea882..6ec3f173 100644
--- a/os/src/main.rs
+++ b/os/src/main.rs
@@ -8,9 +8,11 @@
 mod console;
 mod lang_items;
 mod sbi;
-
+mod syscall;
+mod trap;
 
 global_asm!(include_str!("entry.asm"));
+global_asm!(include_str!("link_app.S"));
 
 fn clear_bss() {
     extern "C" {
@@ -25,23 +27,11 @@ fn clear_bss() {
 #[no_mangle]
 pub fn rust_main() -> ! {
     extern "C" {
-        fn stext();
-        fn etext();
-        fn srodata();
-        fn erodata();
-        fn sdata();
-        fn edata();
-        fn sbss();
-        fn ebss();
-        fn boot_stack();
-        fn boot_stack_top();
+        fn app_0_start();
+        fn app_0_end();
     };
     clear_bss();
     println!("Hello, world!");
-    println!(".text [{:#x}, {:#x})", stext as usize, etext as usize);
-    println!(".rodata [{:#x}, {:#x})", srodata as usize, erodata as usize);
-    println!(".data [{:#x}, {:#x})", sdata as usize, edata as usize);
-    println!("boot_stack [{:#x}, {:#x})", boot_stack as usize, boot_stack_top as usize);
-    println!(".bss [{:#x}, {:#x})", sbss as usize, ebss as usize);
+    println!("app_0 [{:#x}, {:#x})", app_0_start as usize, app_0_end as usize);
     panic!("Shutdown machine!");
 }
\ No newline at end of file
diff --git a/os/src/syscall/mod.rs b/os/src/syscall/mod.rs
new file mode 100644
index 00000000..5a1a1246
--- /dev/null
+++ b/os/src/syscall/mod.rs
@@ -0,0 +1,2 @@
+const SYSCALL_WRITE: usize = 64;
+
diff --git a/os/src/trap.rs b/os/src/trap.rs
new file mode 100644
index 00000000..e69de29b
diff --git a/user/.cargo/config b/user/.cargo/config
index d55502a6..e5ded8a1 100644
--- a/user/.cargo/config
+++ b/user/.cargo/config
@@ -4,4 +4,4 @@ target = "riscv64gc-unknown-none-elf"
 [target.riscv64gc-unknown-none-elf]
 rustflags = [
     "-Clink-args=-Tsrc/linker.ld",
-]
\ No newline at end of file
+]
diff --git a/user/Makefile b/user/Makefile
new file mode 100644
index 00000000..546a2859
--- /dev/null
+++ b/user/Makefile
@@ -0,0 +1,17 @@
+TARGET := riscv64gc-unknown-none-elf
+MODE := release
+APP_DIR := src/bin
+TARGET_DIR := target/$(TARGET)/$(MODE)
+ELFS := $(patsubst $(APP_DIR)/*.rs, $(TARGET_DIR)/*, $(wildcard $(APP_DIR)/*.rs))
+BINS := $(patsubst $(APP_DIR)/*.rs, $(TARGET_DIR)/*.bin, $(wildcard $(APP_DIR)/*.rs))
+
+OBJDUMP := rust-objdump --arch-name=riscv64
+OBJCOPY := rust-objcopy --binary-architecture=riscv64
+
+elf:
+	@cargo build --release
+
+binary: elf
+	$(foreach elf, $(ELFS), $(OBJCOPY) $(elf) --strip-all -O binary $(patsubst $(TARGET_DIR)/*, $(TARGET_DIR)/*.bin, $(elf)))
+
+build: binary