diff --git a/kernel/src/arch/aarch64/interrupt/context.rs b/kernel/src/arch/aarch64/interrupt/context.rs
index df08d0a..9bc2e77 100644
--- a/kernel/src/arch/aarch64/interrupt/context.rs
+++ b/kernel/src/arch/aarch64/interrupt/context.rs
@@ -3,15 +3,15 @@
 #[repr(C)]
 #[derive(Default, Debug, Copy, Clone)]
 pub struct TrapFrame {
-    pub elr: u64,
-    pub spsr: u64,
-    pub sp: u64,
-    pub tpidr: u64,
+    pub elr: usize,
+    pub spsr: usize,
+    pub sp: usize,
+    pub tpidr: usize,
     // pub q0to31: [u128; 32], // disable SIMD/FP registers
-    pub x1to29: [u64; 29],
-    pub __reserved: u64,
-    pub x30: u64, // lr
-    pub x0: u64,
+    pub x1to29: [usize; 29],
+    pub __reserved: usize,
+    pub x30: usize, // lr
+    pub x0: usize,
 }
 
 /// 用于在内核栈中构造新线程的中断帧
@@ -19,17 +19,17 @@ impl TrapFrame {
     fn new_kernel_thread(entry: extern fn(usize) -> !, arg: usize, sp: usize) -> Self {
         use core::mem::zeroed;
         let mut tf: Self = unsafe { zeroed() };
-        tf.x0 = arg as u64;
-        tf.sp = sp as u64;
-        tf.elr = entry as u64;
+        tf.x0 = arg;
+        tf.sp = sp;
+        tf.elr = entry as usize;
         tf.spsr = 0b1101_00_0101; // To EL 1, enable IRQ
         tf
     }
     fn new_user_thread(entry_addr: usize, sp: usize) -> Self {
         use core::mem::zeroed;
         let mut tf: Self = unsafe { zeroed() };
-        tf.sp = sp as u64;
-        tf.elr = entry_addr as u64;
+        tf.sp = sp;
+        tf.elr = entry_addr;
         tf.spsr = 0b1101_00_0000; // To EL 0, enable IRQ
         tf
     }
diff --git a/kernel/src/arch/aarch64/interrupt/handler.rs b/kernel/src/arch/aarch64/interrupt/handler.rs
index 7253e4d..85d1faf 100644
--- a/kernel/src/arch/aarch64/interrupt/handler.rs
+++ b/kernel/src/arch/aarch64/interrupt/handler.rs
@@ -45,7 +45,7 @@ pub extern "C" fn rust_trap(info: Info, esr: u32, tf: &mut TrapFrame) {
             // syndrome is only valid with sync
             match syndrome {
                 Syndrome::Brk(brk) => handle_break(brk, tf),
-                Syndrome::Svc(syscall) => handle_syscall(syscall, tf),
+                Syndrome::Svc(_) => handle_syscall(tf),
                 _ => ::trap::error(tf),
             }
         }
@@ -57,10 +57,23 @@ pub extern "C" fn rust_trap(info: Info, esr: u32, tf: &mut TrapFrame) {
 }
 
 fn handle_break(num: u16, tf: &mut TrapFrame) {
-    tf.elr += 4; // Skip the current brk instruction
+    // Skip the current brk instruction (ref: J1.1.2, page 6147)
+    tf.elr += 4;
 }
 
-fn handle_syscall(num: u16, tf: &mut TrapFrame) {
-    // svc instruction has been skipped in syscall
-    println!("syscall {}", num);
+fn handle_syscall(tf: &mut TrapFrame) {
+    // svc instruction has been skipped in syscall (ref: J1.1.2, page 6152)
+    let ret = ::syscall::syscall(
+        tf.x1to29[7] as usize,
+        [
+            tf.x0,
+            tf.x1to29[0],
+            tf.x1to29[1],
+            tf.x1to29[2],
+            tf.x1to29[3],
+            tf.x1to29[4],
+        ],
+        tf,
+    );
+    tf.x0 = ret as usize;
 }
diff --git a/kernel/src/arch/aarch64/mod.rs b/kernel/src/arch/aarch64/mod.rs
index f5461a6..01f4d4e 100644
--- a/kernel/src/arch/aarch64/mod.rs
+++ b/kernel/src/arch/aarch64/mod.rs
@@ -43,8 +43,12 @@ pub extern "C" fn rust_main() -> ! {
                     asm!("brk 233");
                 },
                 'c' => unsafe {
-                    println!("svc 666");
-                    asm!("svc 666");
+                    println!("sys_putc");
+                    asm!(
+                        "mov x8, #30
+                         mov x0, #65
+                         svc 0"
+                    );
                 },
                 't' => unsafe {
                     println!("{}", timer::get_cycle());
diff --git a/user/aarch64-ucore.json b/user/aarch64-ucore.json
new file mode 100644
index 0000000..357c2e3
--- /dev/null
+++ b/user/aarch64-ucore.json
@@ -0,0 +1,30 @@
+{
+  "abi-blacklist": [
+    "stdcall",
+    "fastcall",
+    "vectorcall",
+    "thiscall",
+    "win64",
+    "sysv64"
+  ],
+  "arch": "aarch64",
+  "data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
+  "executables": true,
+  "linker": "rust-lld",
+  "linker-flavor": "ld.lld",
+  "linker-is-gnu": true,
+  "llvm-target": "aarch64-unknown-none",
+  "no-compiler-rt": true,
+  "features": "+a53,+strict-align,-neon",
+  "max-atomic-width": 128,
+  "os": "none",
+  "panic": "abort",
+  "panic-strategy": "abort",
+  "relocation-model": "static",
+  "position-independent-executables": true,
+  "target-c-int-width": "32",
+  "target-endian": "little",
+  "target-pointer-width": "64",
+  "target-family": "unix",
+  "disable-redzone": true
+}
diff --git a/user/ucore-ulib/src/syscall.rs b/user/ucore-ulib/src/syscall.rs
index 5d8765b..f707142 100644
--- a/user/ucore-ulib/src/syscall.rs
+++ b/user/ucore-ulib/src/syscall.rs
@@ -44,6 +44,12 @@ fn sys_call(id: usize, arg0: usize, arg1: usize, arg2: usize, arg3: usize, arg4:
             : "{rax}" (id), "{rdi}" (arg0), "{rsi}" (arg1), "{rdx}" (arg2), "{rcx}" (arg3), "{r8}" (arg4), "{r9}" (arg5)
             : "memory"
             : "intel" "volatile");
+        #[cfg(target_arch = "aarch64")]
+            asm!("svc 0"
+            : "={x0}" (ret)
+            : "{x8}" (id), "{x0}" (arg0), "{x1}" (arg1), "{x2}" (arg2), "{x3}" (arg3), "{x4}" (arg4), "{x5}" (arg5)
+            : "memory"
+            : "volatile");
     }
     ret
 }
@@ -68,7 +74,7 @@ pub fn sys_open(path: &str, flags: usize) -> i32 {
 }
 
 pub fn sys_close(fd: usize) -> i32 {
-    sys_call(SYS_CLOSE, fd, 0 , 0, 0, 0, 0)
+    sys_call(SYS_CLOSE, fd, 0, 0, 0, 0, 0)
 }
 
 /// Fork the current process. Return the child's PID.
@@ -137,4 +143,4 @@ const SYS_FSYNC: usize = 111;
 const SYS_GETCWD: usize = 121;
 const SYS_GETDIRENTRY: usize = 128;
 const SYS_DUP: usize = 130;
-const SYS_LAB6_SET_PRIORITY: usize = 255;
\ No newline at end of file
+const SYS_LAB6_SET_PRIORITY: usize = 255;