对于学习到的一些基础知识，这里不再介绍，着重强调一下用户态这个东西，也就是说U，S，M三种模式
no_std
在linux上面开启一个编译risvc的rust程序也很简单。
- in your
project, find the.cargoand go into the file.cargo/config.toml- add the following content:
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[build] target = "riscv64gc-unknown-none-elf"
- now, go into your
main.rs, you will find that there is a error- run following commands
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rustup target add riscv64gc-unknown-none-elf
- then, to fix the error use
no_std
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// src/main.rs #![no_std] #![no_main] mod lang_items; fn main(){ } //src/lang_items.rs use core::panic::PanicInfo; #[panic_handler] fn panic(_info: &PanicInfo) -> ! { loop {} } // without this, your project won't go on // because you give up std lib // in no_std panic_handler is empty // which means you must implement it by yourself // then you could biuld your project
-
debug your project
- install tools
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cargo install cargo-binutils rustup component add llvm-tools-preview- DEBUG
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file target/riscv64gc-unknown-none-elf/debug/hello_os rust-readobj -h target/riscv64gc-unknown-none-elf/debug/hello_os rust-objdump -S target/riscv64gc-unknown-none-elf/debug/hello_os
learn qemu
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qemu-system-riscv64 \
-machine virt \
-nographic \
-bios ../bootloader/rustsbi-qemu.bin \
-device loader,file=target/riscv64gc-unknown-none-elf/release/os.bin,addr=0x80200000
