uvm32 initial version

apps/rust-hello/src/main.rs

@@ -0,0 +1,48 @@
+#![no_std]
+#![no_main]
+
+use core::arch::global_asm;
+use core::arch::asm;
+use core::panic::PanicInfo;
+
+// fetch IOREQ definitions from C header
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+// startup code
+global_asm!(include_str!("../../crt0.s"));
+
+fn println(message: &str) {
+    unsafe {
+        asm!(
+            "csrw {i}, {x}",
+            i = const IOREQ_PRINTLN,
+            x = in(reg) message.as_ptr(),
+        );
+    }
+}
+
+fn printd(n: u32) {
+    unsafe {
+        asm!(
+            "csrw {i}, {x}",
+            i = const IOREQ_PRINTD,
+            x = in(reg) n,
+        );
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn main() {
+    for i in 0..10 {
+        printd(i);
+    }
+    println("Hello, world!");
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    //println("Something went wrong");
+    loop {
+        continue;
+    }
+}