Move panics to separate module

Add special panic code for QEMU tests.

nucleus/src/main.rs

@@ -32,6 +32,7 @@ pub mod arch;
 pub use arch::*;
 mod macros;
 mod mm;
+mod panic;
 mod platform;
 #[cfg(feature = "qemu")]
 mod qemu;
@@ -100,11 +101,6 @@ pub fn kmain() -> ! {
     endless_sleep()
 }
 
-#[panic_handler]
-fn panicked(_info: &core::panic::PanicInfo) -> ! {
-    endless_sleep()
-}
-
 #[cfg(test)]
 mod main_tests {
     use super::*;

nucleus/src/panic.rs

@@ -0,0 +1,13 @@
+#[cfg(not(test))]
+#[panic_handler]
+fn panicked(info: &core::panic::PanicInfo) -> ! {
+    crate::println!("{}", info);
+    crate::endless_sleep()
+}
+
+#[cfg(test)]
+#[panic_handler]
+fn panicked(info: &core::panic::PanicInfo) -> ! {
+    crate::println!("[failed]\nError: {}\n", info);
+    crate::qemu::semihosting::exit_failure()
+}

nucleus/src/qemu.rs

@@ -4,13 +4,23 @@
  */
 pub mod semihosting {
     #[cfg(test)]
-    pub fn exit_success() {
+    pub fn exit_success() -> ! {
         use qemu_exit::QEMUExit;
 
         #[cfg(target_arch = "aarch64")]
         let qemu_exit_handle = qemu_exit::AArch64::new();
 
-        qemu_exit_handle.exit_success();
+        qemu_exit_handle.exit_success()
+    }
+
+    #[cfg(test)]
+    pub fn exit_failure() -> ! {
+        use qemu_exit::QEMUExit;
+
+        #[cfg(target_arch = "aarch64")]
+        let qemu_exit_handle = qemu_exit::AArch64::new();
+
+        qemu_exit_handle.exit_failure()
     }
 
     #[cfg(test)]