ch1: Remove std

.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = "riscv64gc-unknown-none-elf"

.vscode/settings.json

@@ -0,0 +1,4 @@
+{
+    "rust-analyzer.checkOnSave": true,
+    "rust-analyzer.cargo.allTargets": false
+}

src/lang_items.rs

@@ -0,0 +1,6 @@
+use core::panic::PanicInfo;
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}

src/main.rs

@@ -1,3 +1,4 @@
-fn main() {
-    println!("Hello, world!");
-}
+#![no_std]
+#![no_main]
+
+mod lang_items;