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

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

@@ -0,0 +1,14 @@
+use core::fmt::Write;
+use core::panic::PanicInfo;
+
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    let mut out = crate::io::Stdout::new();
+    let _ = write!(out, "\nthread {} panicked", crate::thread::current_id());
+    if let Some(loc) = info.location() {
+        let _ = write!(out, " at {}:{}:{}", loc.file(), loc.line(), loc.column());
+    }
+    let _ = writeln!(out, ":\n{}", info.message());
+    out.flush();
+    crate::process::abort()
+}