Data commit

Task/Machine-code/Rust/machine-code.rust

@@ -0,0 +1,44 @@
+extern crate libc;
+
+#[cfg(all(
+    target_os = "linux",
+    any(target_pointer_width = "32", target_pointer_width = "64")
+))]
+fn main() {
+    use std::mem;
+    use std::ptr;
+
+    let page_size: usize = 4096;
+    let (bytes, size): (Vec<u8>, usize) = if cfg!(target_pointer_width = "32") {
+        (
+            vec![0x8b, 0x44, 0x24, 0x04, 0x03, 0x44, 0x24, 0x08, 0xc3],
+            9,
+        )
+    } else {
+        (vec![0x48, 0x89, 0xf8, 0x48, 0x01, 0xf0, 0xc3], 7)
+    };
+    let f: fn(u8, u8) -> u8 = unsafe {
+        let mut page: *mut libc::c_void = ptr::null_mut();
+        libc::posix_memalign(&mut page, page_size, size);
+        libc::mprotect(
+            page,
+            size,
+            libc::PROT_EXEC | libc::PROT_READ | libc::PROT_WRITE,
+        );
+        let contents: *mut u8 = page as *mut u8;
+        ptr::copy(bytes.as_ptr(), contents, 9);
+        mem::transmute(contents)
+    };
+
+    let return_value = f(7, 12);
+    println!("Returned value: {}", return_value);
+    assert_eq!(return_value, 19);
+}
+
+#[cfg(any(
+    not(target_os = "linux"),
+    not(any(target_pointer_width = "32", target_pointer_width = "64"))
+))]
+fn main() {
+    println!("Not supported on this platform.");
+}