如何将Rust代码编译为裸机32位x86(i686)代码?我应该使用什么编译目标?
我想使用cargo/Rust为x86编译裸机32位代码(在32位模式下又称i686又称x86_64)。我需要什么目标?在中,我找不到任何实用的东西。不幸的是,Rust编译器没有内置的目标定义[Rust nightly 1.542021年6月],但您可以提供自定义目标定义: /x86-unknown-bare_metal.json如何将Rust代码编译为裸机32位x86(i686)代码?我应该使用什么编译目标?,rust,Rust,我想使用cargo/Rust为x86编译裸机32位代码(在32位模式下又称i686又称x86_64)。我需要什么目标?在中,我找不到任何实用的东西。不幸的是,Rust编译器没有内置的目标定义[Rust nightly 1.542021年6月],但您可以提供自定义目标定义: /x86-unknown-bare_metal.json { "llvm-target": "i686-unknown-none", "data-layout"
{
"llvm-target": "i686-unknown-none",
"data-layout": "e-m:e-i32:32-f80:128-n8:16:32-S128-p:32:32",
"arch": "x86",
"target-endian": "little",
"target-pointer-width": "32",
"target-c-int-width": "32",
"os": "none",
"executables": true,
"linker-flavor": "ld.lld",
"linker": "rust-lld",
"panic-strategy": "abort",
"disable-redzone": true,
"features": "+soft-float,+sse"
}
此定义将指针宽度设置为32,用于编译可在早期x86引导过程中使用的代码(当您已经处于32位保护模式时)。我不是100%确定“功能”,因为它们可能取决于你想做什么/需要什么<代码>i686指32位模式下的x86_64和
此外,还应添加该文件
/.cargo/config.toml
[unstable]
# cross compile core library for custom target
build-std = ["core", "compiler_builtins"]
build-std-features = ["compiler-builtins-mem"]
[build]
# points to file in project root
target = "x86-unknown-bare_metal.json"
# With this file, another toolchain to the currently selected one will be used, when you execute `cargo build`.
# https://rust-lang.github.io/rustup/overrides.html
[toolchain]
# equals to rust nightly 1.54 as of the release day 2021-05-10
channel = "nightly-2021-05-10"
components = [ "rust-src", "rust-std", "rustc", "cargo" ]
现在,您可以使用cargo build
使用32位x86代码构建裸机二进制文件
// disable rust standard library
#![no_std]
// disables Rust runtime init,
#![no_main]
// see https://docs.rust-embedded.org/embedonomicon/smallest-no-std.html
#![feature(lang_items)]
// see https://docs.rust-embedded.org/embedonomicon/smallest-no-std.html
#[lang = "eh_personality"]
extern "C" fn eh_personality() {}
use core::panic::PanicInfo;
use core::sync::atomic;
use core::sync::atomic::Ordering;
#[no_mangle]
/// The name **must be** `_start`, otherwise the compiler doesn't output anything
/// to the object file. I don't know why it is like this.
fn _start() -> ! {
loop {}
}
#[inline(never)]
#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
loop {
atomic::compiler_fence(Ordering::SeqCst);
}
}
为方便起见,您还应添加
/rust toolchain.toml
[unstable]
# cross compile core library for custom target
build-std = ["core", "compiler_builtins"]
build-std-features = ["compiler-builtins-mem"]
[build]
# points to file in project root
target = "x86-unknown-bare_metal.json"
# With this file, another toolchain to the currently selected one will be used, when you execute `cargo build`.
# https://rust-lang.github.io/rustup/overrides.html
[toolchain]
# equals to rust nightly 1.54 as of the release day 2021-05-10
channel = "nightly-2021-05-10"
components = [ "rust-src", "rust-std", "rustc", "cargo" ]