Initial Commit

.cargo/config.toml

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+[build]
+target = "x86_64_plain_os.json"
+
+[unstable]
+# enable implementations for memset, memcpy and memcmp etc.
+build-std-features = ["compiler-builtins-mem"]
+# for our target triple, there is no `core` prebuilt. So we need to do this by
+# ourselves using this option:
+build-std = ["core", "compiler_builtins"]

.gitignore

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+/target

Cargo.lock

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

Cargo.toml

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+[package]
+name = "plain_os"
+version = "0.1.0"
+edition = "2021"
+
+resolver = "2"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[profile.dev]
+panic = "abort" # disable stack unwinding on panic
+
+[profile.release]
+panic = "abort" # disable stack unwinding on panic
+
+[dependencies]

src/main.rs

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+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+/// This function defines the panic handler
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop{}
+}
+
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
+    // this function is the entry point, since the linker looks for a function
+    // named `_start` by default
+    loop {}
+}

x86_64_plain_os.json

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+{
+    "llvm-target": "x86_64-unknown-none",
+    "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
+    "arch": "x86_64",
+    "target-endian": "little",
+    "target-pointer-width": "64",
+    "target-c-int-width": "32",
+    "os": "none",
+    "executables": true,
+    "linker-flavor": "ld.lld",
+    "linker": "rust-lld",
+    "panic-strategy": "abort",
+    "disable-redzone": true,
+    "features": "-mmx,-sse,+soft-float"
+}