add stack_overflow exercise

beginner/apps/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
+    }
+}

embedded-workshop-book/src/SUMMARY.md

@@ -57,6 +57,7 @@
     - [Inspecting the Descriptors](./inspecting-descriptors.md)
     - [Getting it Configured](./getting-device-configured.md)
     - [Next Steps](./advanced-next-steps.md)
+        - [Stack Overflow Protection](./stack-overflow-protection.md)
 - [References and Resources](./references-resources.md)
     - [Tooltips](./tooltips.md)
 - [Troubleshooting](./troubleshooting.md)

embedded-workshop-book/src/installation.md

@@ -176,6 +176,12 @@ Leave the processes running in the background.
 
 #### Advanced workshop
 
+```console
+$ cargo install flip-link
+(..)
+Installed package `flip-link v0.1.2` (..)
+```
+
 Change to the `tools` folder and run these commands:
 
 ```console