feat: add Rust userspace support; fix TLS layout for p_align < 16; kill whole process on sibling-thread faults

programs/rust/montauk-rt/src/time.rs

@@ -0,0 +1,18 @@
+//! Time and sleeping.
+
+use core::time::Duration;
+
+use crate::sys;
+
+/// Milliseconds since boot (monotonic).
+pub fn uptime_ms() -> u64 {
+    unsafe { sys::syscall0(sys::SYS_GETMILLISECONDS) as u64 }
+}
+
+/// Sleep for at least `d`, rounded up to the 1 ms scheduler tick.
+pub fn sleep(d: Duration) {
+    let ms = d.as_millis().min(u64::MAX as u128) as u64 + u64::from(d.subsec_nanos() % 1_000_000 != 0);
+    if ms > 0 {
+        unsafe { sys::syscall1(sys::SYS_SLEEP_MS, ms) };
+    }
+}