trezor-firmware/core/embed/rust/src/lib.rs

#![cfg_attr(not(test), no_std)]
#![deny(clippy::all)]
#![allow(clippy::new_without_default)]
#![deny(unsafe_op_in_unsafe_fn)]
#![allow(internal_features)]
// Allowing dead code not to cause a lot of warnings when building for a specific target
// (when building for TR, a lot of code only used in TT would get marked as unused).
#![allow(dead_code)]
#![feature(lang_items)]
#![feature(optimize_attribute)]

#[macro_use]
extern crate num_derive;

#[macro_use]
mod macros;

#[cfg(feature = "crypto")]
mod crypto;
#[cfg(feature = "debug")]
mod debug;
mod error;
mod io;
mod maybe_trace;
#[cfg(feature = "micropython")]
mod micropython;
#[cfg(feature = "protobuf")]
mod protobuf;
mod storage;
mod strutil;
mod time;
#[cfg(feature = "ui_debug")]
mod trace;
#[cfg(feature = "translations")]
mod translations;
mod trezorhal;

// mod ui is `pub` because of the re-export pattern in individual models, which
// would trigger a brickload of "unused symbol" warnings otherwise.
// TODO: maybe get rid of the re-export pattern :shrugs:
#[cfg(feature = "ui")]
pub mod ui;

#[cfg(feature = "debug")]
#[cfg(not(test))]
#[panic_handler]
/// More detailed panic handling. The difference against
/// default `panic` below is that this "debug" version
/// takes around 10 kB more space in the flash region.
fn panic_debug(panic_info: &core::panic::PanicInfo) -> ! {
    // Filling at least the file and line information, if available.
    // TODO: find out how to display message from panic_info.message()
    if let Some(location) = panic_info.location() {
        trezorhal::fatal_error::__fatal_error("rs", location.file(), location.line());
    } else {
        trezorhal::fatal_error::__fatal_error("rs", "", 0);
    }
}

#[cfg(not(feature = "debug"))]
#[cfg(not(test))]
#[cfg(any(not(feature = "test"), feature = "clippy"))]
#[panic_handler]
/// Default panic handling. Not showing any details - thus saving flash space.
fn panic(_info: &core::panic::PanicInfo) -> ! {
    // TODO: as of Rust 1.63 / nightly 2022-08, ignoring the `_info` parameter does
    // not help with saving flash space -- the `fmt` machinery still gets
    // compiled in. We can avoid that by using unstable Cargo arguments:
    //   -Zbuild-std=core -Zbuild-std-features=panic_immediate_abort
    // Doing that will compile every panic!() to a single udf instruction which
    // raises a Hard Fault on hardware.
    //
    // Otherwise, use `unwrap!` macro from trezorhal.
    fatal_error!("rs");
}

#[cfg(not(target_arch = "arm"))]
#[cfg(not(test))]
#[cfg(any(not(feature = "test"), feature = "clippy"))]
#[lang = "eh_personality"]
/// Needed by full debuginfo `opt-level = 0` builds for some reason.
extern "C" fn eh_personality() {}