基于 RISCV 的裸机程序

embedded/2024/10/16 2:24:10/

基于 RISCV 的裸机程序

基于 RISCV 的裸机程序
- 配置环境
- 标准 rust 代码
- - 通过 `cargo` 生成一段标准代码
  - 搭建裸机程序
  - 添加退出系统调用
  - 添加 `println!` 宏
参考文档

基于 RISCV 的裸机程序

配置环境

ansen@ansen-virtual-machine:~$ rustc --version
rustc 1.83.0-nightly (9ff5fc4ff 2024-10-03)ansen@ansen-virtual-machine:~$ qemu-system-riscv64 --version
QEMU emulator version 7.0.0
Copyright (c) 2003-2022 Fabrice Bellard and the QEMU Project developers

另外安装：

rustup target add riscv64gc-unknown-none-elf
cargo install cargo-binutils
rustup component add rust-src
rustup component add llvm-tools-preview

rust__24">标准 rust 代码

通过 `cargo` 生成一段标准代码

cargo new hello

src/main.rs 代码

rust">fn main() {println!("Hello, world!");
}

运行 cargo run 可以看到执行结果：

ansen@ansen-virtual-machine:~/work/src/tmp/hello$ cargo runCompiling hello v0.1.0 (/home/ansen/work/src/tmp/hello)Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.86sRunning `target/debug/hello`
Hello, world!

如果在 riscv 上运行，需要编译成 riscv 的指令。通过：

cargo run --target riscv64gc-unknown-none-elf

可以生成可执行代码，但会报错

ansen@ansen-virtual-machine:~/work/src/tmp/hello$ cargo run --target riscv64gc-unknown-none-elfCompiling hello v0.1.0 (/home/ansen/work/src/tmp/hello)
error[E0463]: can't find crate for `std`|= note: the `riscv64gc-unknown-none-elf` target may not support the standard library= note: `std` is required by `hello` because it does not declare `#![no_std]`= help: consider building the standard library from source with `cargo build -Zbuild-std`error: cannot find macro `println` in this scope--> src/main.rs:2:5|
2 |     println!("Hello, world!");|     ^^^^^^^error: `#[panic_handler]` function required, but not founderror: requires `sized` lang_itemFor more information about this error, try `rustc --explain E0463`.
error: could not compile `hello` (bin "hello") due to 4 previous errors