diff --git a/Cargo.toml b/Cargo.toml
index 733a5aa..1104c73 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,6 +29,7 @@ bit_field = "0.9.0"
 volatile = "0.1.0"
 lazy_static = { version = "1.0.0", features = ["spin_no_std"] }
 bit-allocator = { path = "crate/bit-allocator" }
+ucore-memory = { path = "crate/memory" }
 
 
 [target.x86_64-blog_os.dependencies]
@@ -39,10 +40,9 @@ redox_syscall = "0.1"
 log = "0.4"
 uart_16550 = "0.1"
 simple-filesystem = { git = "https://github.com/wangrunji0408/SimpleFileSystem-Rust" }
-ucore-memory = { path = "crate/memory" }
 
 [target.riscv32-blog_os.dependencies]
-linked_list_allocator = { version = "0.5", default-features = false } # due to rust version
+linked_list_allocator = "0.5" # due to rust version
 riscv = { path = "crate/riscv" }
 bbl = { path = "crate/bbl" }
 
diff --git a/crate/memory/src/lib.rs b/crate/memory/src/lib.rs
index 480d8e3..e48802d 100644
--- a/crate/memory/src/lib.rs
+++ b/crate/memory/src/lib.rs
@@ -11,6 +11,8 @@ extern crate alloc;
 extern crate std;
 
 pub mod paging;
+// FIXME: LLVM error on riscv32
+#[cfg(target_arch = "x86_64")]
 pub mod cow;
 pub mod swap;
 
diff --git a/crate/riscv b/crate/riscv
index ef046c8..4bf5f1b 160000
--- a/crate/riscv
+++ b/crate/riscv
@@ -1 +1 @@
-Subproject commit ef046c88fdb7ed0f416f29e034d4679f0e7a2573
+Subproject commit 4bf5f1b732b8977d445f668df0b3f11c0d19d9a5
diff --git a/src/io/riscv_io.rs b/src/io/riscv_io.rs
index 6619310..c324296 100644
--- a/src/io/riscv_io.rs
+++ b/src/io/riscv_io.rs
@@ -13,6 +13,31 @@ macro_rules! println {
     ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
 }
 
+macro_rules! trace {
+    ($fmt:expr) => (print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+}
+
+macro_rules! debug {
+    ($fmt:expr) => (print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+}
+
+macro_rules! info {
+    ($fmt:expr) => (print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+}
+
+macro_rules! warn {
+    ($fmt:expr) => (print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+}
+
+macro_rules! error {
+    ($fmt:expr) => (print!(concat!($fmt, "\n")));
+    ($fmt:expr, $($arg:tt)*) => (print!(concat!($fmt, "\n"), $($arg)*));
+}
+
 pub fn print(args: fmt::Arguments) {
     use arch::serial::SerialPort;
     use core::fmt::Write;
diff --git a/src/lang.rs b/src/lang.rs
index d2cef8a..95914f1 100644
--- a/src/lang.rs
+++ b/src/lang.rs
@@ -32,6 +32,6 @@ pub fn panic_fmt(fmt: ::core::fmt::Arguments, file: &'static str, line: u32, col
 #[cfg(target_arch = "x86_64")]
 #[lang = "oom"]
 #[no_mangle]
-fn oom() -> ! {
+pub fn oom() -> ! {
     panic!("out of memory");
 }
diff --git a/src/lib.rs b/src/lib.rs
index 0d773e1..4b4ef86 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,19 +20,13 @@
 
 
 #[macro_use]
-#[cfg(target_arch = "x86_64")]
 extern crate alloc;
-#[cfg(target_arch = "x86_64")]
 extern crate bit_allocator;
-#[cfg(target_arch = "x86_64")]
 extern crate bit_field;
 #[macro_use]
-#[cfg(target_arch = "x86_64")]
 extern crate bitflags;
 #[macro_use]
-#[cfg(target_arch = "x86_64")]
 extern crate lazy_static;
-#[cfg(target_arch = "x86_64")]
 extern crate linked_list_allocator;
 #[macro_use]
 #[cfg(target_arch = "x86_64")]
@@ -40,7 +34,6 @@ extern crate log;
 #[cfg(target_arch = "x86_64")]
 extern crate multiboot2;
 #[macro_use]
-#[cfg(target_arch = "x86_64")]
 extern crate once;
 extern crate rlibc;
 #[cfg(target_arch = "x86_64")]
@@ -50,20 +43,16 @@ extern crate spin;
 extern crate syscall as redox_syscall;
 #[cfg(target_arch = "x86_64")]
 extern crate uart_16550;
-#[cfg(target_arch = "x86_64")]
 extern crate ucore_memory;
-#[cfg(target_arch = "x86_64")]
 extern crate volatile;
 #[macro_use]
 #[cfg(target_arch = "x86_64")]
 extern crate x86_64;
-#[cfg(target_arch = "x86_64")]
 extern crate xmas_elf;
 
 pub use arch::interrupt::rust_trap;
 #[cfg(target_arch = "x86_64")]
 pub use arch::interrupt::set_return_rsp;
-#[cfg(target_arch = "x86_64")]
 use linked_list_allocator::LockedHeap;
 
 #[macro_use]    // print!
@@ -78,11 +67,7 @@ mod io;
 #[cfg(target_arch = "x86_64")]
 mod memory;
 mod lang;
-#[cfg(target_arch = "x86_64")]
 mod util;
-#[macro_use]
-mod macros;
-#[cfg(target_arch = "x86_64")]
 mod consts;
 #[cfg(target_arch = "x86_64")]
 mod process;
@@ -130,9 +115,6 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) -> ! {
     arch::gdt::init();
 
     memory::test::cow();
-    test!(global_allocator);
-    test!(guard_page);
-    test!(find_mp);
 
     let acpi = arch::driver::init(rsdt_addr, |addr: usize, count: usize| {
         use memory::*;
@@ -151,23 +133,7 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) -> ! {
 //    sync::test::philosopher_using_monitor();
     sync::mpsc::test::test_all();
 
-    // 直接进入用户态暂不可用：内核代码用户不可访问
-//    unsafe{
-//        use arch::syscall;
-//        // 在用户模式下触发时钟中断，会导致GPF
-//        // （可能是由于没有合理分离栈）
-//        no_interrupt!({
-//            syscall::switch_to_user();
-//            println!("Now in user mode");
-//            syscall::switch_to_kernel();
-//            println!("Now in kernel mode");
-//        });
-//    }
-
     loop {}
-
-    test_end!();
-    unreachable!();
 }
 
 /// The entry point for another processors
@@ -191,33 +157,4 @@ pub extern "C" fn other_main() -> ! {
 ///
 /// It should be defined in memory mod, but in Rust `global_allocator` must be in root mod.
 #[global_allocator]
-#[cfg(target_arch = "x86_64")]
 static HEAP_ALLOCATOR: LockedHeap = LockedHeap::empty();
-
-#[cfg(target_arch = "x86_64")]
-mod test {
-    pub fn global_allocator() {
-        for i in 0..10000 {
-            format!("Some String");
-        }
-    }
-    pub fn find_mp() {
-        use arch;
-        let mp = arch::driver::mp::find_mp();
-        assert!(mp.is_some());
-    }
-    pub fn guard_page() {
-        use x86_64;
-        // invoke a breakpoint exception
-        unsafe { asm!("int 3"::::"intel" "volatile"); }
-
-        fn stack_overflow() {
-            stack_overflow(); // for each recursion, the return address is pushed
-        }
-
-        // trigger a stack overflow
-        stack_overflow();
-
-        println!("It did not crash!");
-    }
-}
\ No newline at end of file
diff --git a/src/macros.rs b/src/macros.rs
deleted file mode 100644
index d349beb..0000000
--- a/src/macros.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-macro_rules! test_end {
-	() => (
-		println!("Test end");
-		// test success	
-		unsafe{ arch::cpu::exit_in_qemu(11) }
-	)
-}
-
-macro_rules! test {
-	// ($name:expr, $body:expr) => (
-	// 	if cfg!(feature = "test") {
-	// 		println!("Testing: {}", $name);
-	// 		$body;
-	// 		println!("Success: {}", $name);
-	// 	}
-	// );
-	($func:ident) => (
-		if cfg!(feature = "test") {
-			println!("Testing: {}", stringify!($func));
-			test::$func();
-			println!("Success: {}", stringify!($func));
-		}
-	)
-}