#[lang = "panic_fmt"] -> #[panic_implementation]

Author: japaric

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [v0.2.0] - 2018-06-04
+
+### Changed
+
+- [breaking-change] moved from the, now removed, `panic_fmt` lang item to the
+  `#[panic_implementation]` attribute.
+
 ## [v0.1.1] - 2018-05-11
 
 ### Changed
@@ -20,5 +27,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 Initial release
 
-[Unreleased]: https://github.com/japaric/panic-itm/compare/v0.1.1...HEAD
+[Unreleased]: https://github.com/japaric/panic-itm/compare/v0.2.0...HEAD
+[v0.2.0]: https://github.com/japaric/panic-itm/compare/v0.1.1...v0.2.0
 [v0.1.1]: https://github.com/japaric/panic-itm/compare/v0.1.0...v0.1.1

Cargo.toml

@@ -6,8 +6,7 @@ keywords = ["panic-impl", "panic", "ITM", "ARM", "Cortex-M"]
 license = "MIT OR Apache-2.0"
 name = "panic-itm"
 repository = "https://github.com/japaric/panic-itm"
-version = "0.1.1"
+version = "0.2.0"
 
 [dependencies]
-aligned = "0.2.0"
 cortex-m = "0.5.0"

src/lib.rs

@@ -30,34 +30,25 @@
 
 #![deny(missing_docs)]
 #![deny(warnings)]
-#![feature(lang_items)]
+#![feature(panic_implementation)]
 #![no_std]
 
-extern crate aligned;
 #[macro_use]
 extern crate cortex_m;
 
-use aligned::Aligned;
+use core::panic::PanicInfo;
+
 use cortex_m::peripheral::ITM;
-use cortex_m::{interrupt, itm};
-
-#[lang = "panic_fmt"]
-unsafe extern "C" fn panic_fmt(
-    args: core::fmt::Arguments,
-    file: &'static str,
-    line: u32,
-    col: u32,
-) -> ! {
+use cortex_m::interrupt;
+
+#[panic_implementation]
+fn panic(info: &PanicInfo) -> ! {
     interrupt::disable();
 
-    let itm = &mut *ITM::ptr();
+    let itm = unsafe { &mut *ITM::ptr() };
     let stim = &mut itm.stim[0];
 
-    itm::write_aligned(stim, &Aligned(*b"panicked at '"));
-    itm::write_fmt(stim, args);
-    itm::write_aligned(stim, &Aligned(*b"', "));
-    itm::write_str(stim, file);
-    iprintln!(stim, ":{}:{}", line, col);
+    iprintln!(stim, "{}", info);
 
     loop {}
 }