tg-rcore-tutorial-user 0.4.10

User-space apps for rCore Tutorial chapters (subset for ch2).
Documentation
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#![no_std]
#![no_main]

#[macro_use]
extern crate user_lib;

// 教学目标:
// 验证最小用户程序是否能被内核正确装载并输出到控制台。

#[unsafe(no_mangle)]
extern "C" fn main() -> i32 {
    println!("Hello, world from user mode program!");
    0
}