01_bareminimum: Use panic-abort crate instead of own handler

01_bareminimum/Cargo.lock

@@ -1,4 +1,14 @@
 [[package]]
 name = "kernel8"
 version = "0.1.0"
+dependencies = [
+ "panic-abort 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
+[[package]]
+name = "panic-abort"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[metadata]
+"checksum panic-abort 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "75553c30311427a2d9f24a646fc8cedb00e1da1c6bd1608d71d634184c60392e"

01_bareminimum/Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 authors = ["Andre Richter <andre.o.richter@gmail.com>"]
 
 [dependencies]
+panic-abort = "0.1.1"

01_bareminimum/README.md

@@ -26,9 +26,12 @@ much as possible, we are already setting up a Rust crate. This allows us to use
 
 We define the crate to not use the standard library (`#![no_std]`), indicate
 that it does not have a main function via `#![no_main]`, and also define a stub
-for the `panic_fmt()` handler, which is a requirement for `no_std` crates.
+for the `panic_fmt()` handler, which is a requirement for `no_std` crates. We do
+this by pulling in the [panic-abort][pa] crate.
 
-In th end, we (mis)use `main.rs` as a wrapper to process our assembly file via
+[pa]: https://crates.io/crates/panic-abort
+
+In summary, we (mis)use `main.rs` as a wrapper to process our assembly file via
 `rustc`. The assembly file iself is included with the [global_asm!()][gasm]
 macro.
 

01_bareminimum/src/main.rs

@@ -24,17 +24,8 @@
 
 #![no_std]
 #![no_main]
-#![feature(lang_items)]
 #![feature(global_asm)]
 
-#[lang = "panic_fmt"]
-unsafe extern "C" fn panic_fmt(
-    _args: core::fmt::Arguments,
-    _file: &'static str,
-    _line: u32,
-    _col: u32,
-) -> ! {
-    loop {}
-}
+extern crate panic_abort;
 
 global_asm!(include_str!("boot_cores.S"));