Finish basic structure

This commit is contained in:
Sainnhe Park 2021-12-01 11:41:32 +08:00
parent 960d5191f3
commit e33464e47d
3 changed files with 30 additions and 4 deletions

7
Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "anos"
version = "0.1.0"

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[package] [package]
name = "anos" name = "anos"
version = "0.1.0" version = "0.1.0"
authors = ["Sainnhe Park <sainnhe@gmail.com>"]
edition = "2021" edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html [profile.dev]
panic = "abort" # 禁用 panic 时的栈展开
[dependencies] [profile.release]
panic = "abort" # 禁用 panic 时的栈展开

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fn main() { #![no_std] // 不链接 Rust 标准库
println!("Hello, world!"); #![no_main] // 禁用 main 入口点,因为没有运行时
use core::panic::PanicInfo;
#[no_mangle] // 不重整函数名,否则编译器可能会生成名为 _ZN3blog_os4_start7hb173fedf945531caE 的函数
// extern "C" 告诉编译器这个函数应当使用 C 语言的调用约定
// 函数名为 _start 是因为大多数系统默认用这个名字作为入口点名称
// -> ! 代表这是一个发散函数,不允许有任何返回值,因为它不会被任何函数调用,而是将直接被 bootloader 调用
pub extern "C" fn _start() -> ! {
loop {}
}
#[panic_handler]
// panic! 时将会进行栈展开,执行各种 drop 函数来回收垃圾
// 禁用标准库之后,这些东西就都没有了,我们需要把它重写一遍
fn panic(_info: &PanicInfo) -> ! {
loop {}
} }