diff --git a/theseus/src/lib.rs b/theseus/src/lib.rs
index 3c74574..4f91dd2 100644
--- a/theseus/src/lib.rs
+++ b/theseus/src/lib.rs
@@ -6,8 +6,19 @@ pub mod riscv;
 pub mod spinlock;
 pub mod uart;
 
+extern "C" {
+	// printf.c
+	fn panic(s: *const u8);
+}
+
+/// '!RUST PANIC!\0'
+static PANIC_MSG: [u8; 13] = [33, 82, 85, 83, 84, 32, 80, 65, 78, 73, 67, 33, 0];
+
 #[panic_handler]
 #[no_mangle]
-fn panic(_info: &core::panic::PanicInfo) -> ! {
+fn panic_handler(_info: &core::panic::PanicInfo) -> ! {
+	unsafe {
+		panic(core::ptr::addr_of!(PANIC_MSG[0]));
+	}
 	loop {}
 }
diff --git a/theseus/src/uart.rs b/theseus/src/uart.rs
index 3477dca..1957f08 100644
--- a/theseus/src/uart.rs
+++ b/theseus/src/uart.rs
@@ -15,6 +15,9 @@ extern "C" {
 	// proc.c
 	fn sleep(chan: *const u64, spinlock: *mut SpinLock);
 	fn wakeup(chan: *const u64);
+
+	//printf.c
+	static mut panicked: bool;
 }
 
 // the UART control registers are memory-mapped
@@ -69,8 +72,6 @@ static mut uart_tx_buf: [u8; UART_TX_BUF_SIZE] = [0; UART_TX_BUF_SIZE];
 static mut uart_tx_w: u64 = 0; // write next to uart_tx_buf[uart_tx_w % UART_TX_BUF_SIZE]
 static mut uart_tx_r: u64 = 0; // read next from uart_tx_buf[uart_tx_r % UART_TX_BUF_SIZE]
 
-static mut panicked: bool = false;
-
 #[no_mangle]
 pub extern "C" fn uartinit() {
 	// disable interrupts.