From 4cdb377855b0e91ad83075236b26e1a2230b54d2 Mon Sep 17 00:00:00 2001
From: Lotte Steenbrink <lotte.steenbrink@ferrous-systems.com>
Date: Fri, 22 Jan 2021 12:40:17 +0100
Subject: [PATCH] provoke stack overflow more blatantly

---
 advanced/firmware/src/bin/stack_overflow.rs | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/advanced/firmware/src/bin/stack_overflow.rs b/advanced/firmware/src/bin/stack_overflow.rs
index e5930e8..b98ea13 100644
--- a/advanced/firmware/src/bin/stack_overflow.rs
+++ b/advanced/firmware/src/bin/stack_overflow.rs
@@ -10,7 +10,8 @@ fn main() -> ! {
     // board initialization
     dk::init().unwrap();
 
-    log::info!("fib(100) = {:?}", fib(100));
+    log::info!("provoking stack overflow...");
+    spam();
 
     loop {
         asm::bkpt();
@@ -18,13 +19,12 @@ fn main() -> ! {
 }
 
 #[inline(never)]
-fn fib(n: u32) -> u32 {
-    // allocate and initialize one kilobyte of stack memory to provoke stack overflow
-    let _use_stack = [0xAA; 1024];
+fn spam() {
+    // allocate and initialize one kilobyte of stack memory to provoke stack overflow quicker
+    let use_stack = [0xAA; 1024];
+    let addr = &use_stack as *const i32;
 
-    if n < 2 {
-        1
-    } else {
-        fib(n - 1) + fib(n - 2) // recursion
-    }
+    log::info!("address of current `use_stack`: {:?}", addr);
+
+    spam(); // infinite recursion
 }