add stack_overflow.rs

advanced/firmware/src/bin/stack_overflow.rs

@@ -0,0 +1,30 @@
+#![no_main]
+#![no_std]
+
+use cortex_m::asm;
+use cortex_m_rt::entry;
+use panic_log as _; // panic handler
+
+#[entry]
+fn main() -> ! {
+    // board initialization
+    dk::init().unwrap();
+
+    log::info!("fib(100) = {:?}", fib(100));
+
+    loop {
+        asm::bkpt();
+    }
+}
+
+#[inline(never)]
+fn fib(n: u32) -> u32 {
+    // allocate and initialize one kilobyte of stack memory to provoke stack overflow
+    let _use_stack = [0xAA; 1024];
+
+    if n < 2 {
+        1
+    } else {
+        fib(n - 1) + fib(n - 2) // recursion
+    }
+}