Bump rust-toolchain and linked-list-allocator versions.

patches/libtock-rs/02-panic_console.patch

@@ -0,0 +1,81 @@
+diff --git a/Cargo.toml b/Cargo.toml
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -7,6 +7,9 @@
+
+ [dependencies]
+ linked_list_allocator = "0.6.6"
++
++[features]
++panic_console = []
+
+ [dev-dependencies]
+ corepack = { version = "0.4.0", default-features = false, features = ["alloc"] }
+diff --git a/src/lang_items.rs b/src/lang_items.rs
+index ab2c945..deef73b 100644
+--- a/src/lang_items.rs
++++ b/src/lang_items.rs
+@@ -18,10 +18,14 @@
+ //! `rustc_main`. That's covered by the `_start` function in the root of this
+ //! crate.
+
++#[cfg(feature = "panic_console")]
++use crate::console::Console;
+ use crate::led;
+ use crate::timer;
+ use crate::timer::Duration;
+ use core::alloc::Layout;
++#[cfg(feature = "panic_console")]
++use core::fmt::Write;
+ use core::panic::PanicInfo;
+
+ #[lang = "start"]
+@@ -42,11 +46,7 @@
+     }
+ }
+
+-#[panic_handler]
+-fn panic_handler(_info: &PanicInfo) -> ! {
++fn flash_all_leds() -> ! {
+-    // Signal a panic using the LowLevelDebug capsule (if available).
+-    super::debug::low_level_status_code(1);
+-
+     // Flash all LEDs (if available).
+     loop {
+         for led in led::all() {
+@@ -60,6 +59,34 @@
+     }
+ }
+
++#[cfg(feature = "panic_console")]
++#[panic_handler]
++fn panic_handler(info: &PanicInfo) -> ! {
++    // Signal a panic using the LowLevelDebug capsule (if available).
++    super::debug::low_level_status_code(1);
++
++    let mut console = Console::new();
++    writeln!(console, "{}", info).ok();
++    // Force the kernel to report the panic cause, by reading an invalid address.
++    // The memory protection unit should be setup by the Tock kernel to prevent apps from accessing
++    // address zero.
++    unsafe {
++        core::ptr::read_volatile(0 as *const usize);
++    }
++    // We still flash the LEDs in case for some reason the previous line didn't cause a crash in
++    // the kernel.
++    flash_all_leds();
++}
++
++#[cfg(not(feature = "panic_console"))]
++#[panic_handler]
++fn panic_handler(_info: &PanicInfo) -> ! {
++    // Signal a panic using the LowLevelDebug capsule (if available).
++    super::debug::low_level_status_code(1);
++
++    flash_all_leds();
++}
++
+ #[alloc_error_handler]
+ fn cycle_leds(_: Layout) -> ! {
+     loop {
+