| // Copyright 2022, The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| //! Rust entry point. |
| |
| use crate::{console, power::shutdown}; |
| |
| /// This is the entry point to the Rust code, called from the binary entry point in `entry.S`. |
| #[no_mangle] |
| extern "C" fn rust_entry(x0: u64, x1: u64, x2: u64, x3: u64) -> ! { |
| console::init(); |
| unsafe { |
| main(x0, x1, x2, x3); |
| } |
| shutdown(); |
| } |
| |
| extern "Rust" { |
| /// Main function provided by the application using the `main!` macro. |
| fn main(arg0: u64, arg1: u64, arg2: u64, arg3: u64); |
| } |
| |
| /// Marks the main function of the binary. |
| /// |
| /// Example: |
| /// |
| /// ```rust |
| /// use vmbase::main; |
| /// |
| /// main!(my_main); |
| /// |
| /// fn my_main() { |
| /// println!("Hello world"); |
| /// } |
| /// ``` |
| #[macro_export] |
| macro_rules! main { |
| ($name:path) => { |
| // Export a symbol with a name matching the extern declaration above. |
| #[export_name = "main"] |
| fn __main(arg0: u64, arg1: u64, arg2: u64, arg3: u64) { |
| // Ensure that the main function provided by the application has the correct type. |
| $name(arg0, arg1, arg2, arg3) |
| } |
| }; |
| } |