增加内核的panic handler

src/lib.rs

@@ -2,5 +2,68 @@
 
 extern crate alloc;
 
+use alloc::{
+    string::{String, ToString},
+    vec::Vec,
+};
+use core::{panic::PanicInfo, ptr::null_mut};
+
+use kernel::tty::tty::{self, tty_enable, tty_text_print, Color};
+
 pub mod kernel;
 pub mod libk;
+
+#[panic_handler]
+unsafe fn kernel_panic_handler(info: &PanicInfo) -> ! {
+    let line_in_file = if let Some(loca) = info.location() {
+        loca.line().to_string()
+    } else {
+        String::new()
+    };
+    let info = {
+        let mut v = Vec::new();
+        v.push(("Kernel Panic: ", (Color::RED, Color::BLACK)));
+        v.push((
+            if let Some(loca) = info.location() {
+                loca.file()
+            } else {
+                "NoFile"
+            },
+            (Color::GREEN, Color::BLACK),
+        ));
+        v.push((":", (Color::WHITE, Color::BLACK)));
+        v.push((
+            if let Some(_) = info.location() {
+                line_in_file.as_str()
+            } else {
+                "NoLine"
+            },
+            (Color::WHITE, Color::BLACK),
+        ));
+        v.push((": ", (Color::WHITE, Color::BLACK)));
+        v.push((
+            if let Some(&s) = info.payload().downcast_ref::<&str>() {
+                s
+            } else {
+                "Unknown panic."
+            },
+            (Color::GREEN, Color::BLACK),
+        ));
+        v.push(("\n", (Color::BLACK, Color::BLACK)));
+        v
+    };
+    let tty = tty::tty_get(0);
+    if tty != null_mut() {
+        let tty = *tty;
+        tty_enable(tty);
+        for (msgo, (fgc, bgc)) in info.into_iter() {
+            let msg = String::from(msgo).as_bytes_mut() as *mut [u8] as *mut u8;
+            let p = msg.offset(msgo.len() as isize);
+            let swp = *p;
+            *p = 0;
+            tty_text_print(tty, msg, u32::from(fgc), u32::from(bgc));
+            *p = swp;
+        }
+    }
+    loop {}
+}