From fa2420d5d92d0320db5cf1e5344ed6a69c3e78f5 Mon Sep 17 00:00:00 2001
From: Felix Wittwer <dev@felixwittwer.de>
Date: Sun, 27 Mar 2022 17:45:56 +0200
Subject: [PATCH] Initial Commit

---
 .cargo/config.toml   |  9 +++++++++
 .gitignore           |  1 +
 Cargo.lock           |  7 +++++++
 Cargo.toml           | 16 ++++++++++++++++
 src/main.rs          | 17 +++++++++++++++++
 x86_64_plain_os.json | 15 +++++++++++++++
 6 files changed, 65 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs
 create mode 100644 x86_64_plain_os.json

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..9b4e124
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,9 @@
+[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"]
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a083e15
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "plain_os"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..1be67dc
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[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]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c388797
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,17 @@
+#![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 {}
+}
diff --git a/x86_64_plain_os.json b/x86_64_plain_os.json
new file mode 100644
index 0000000..346fefd
--- /dev/null
+++ b/x86_64_plain_os.json
@@ -0,0 +1,15 @@
+{
+    "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"
+}
\ No newline at end of file