1 files changed, 30 insertions, 0 deletions
diff --git a/cortex-m-rt/examples/data_overflow.rs b/cortex-m-rt/examples/data_overflow.rs
new file mode 100644
index 0000000..a84ec12
--- /dev/null
+++ b/cortex-m-rt/examples/data_overflow.rs
@@ -0,0 +1,30 @@
+//! This is not an example; this is a linker overflow detection test
+//! which should fail to link due to .data overflowing FLASH.
+
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+extern crate cortex_m_rt as rt;
+extern crate panic_halt;
+
+use core::ptr;
+
+use rt::entry;
+
+// This large static array uses most of .rodata
+static RODATA: [u8; 48 * 1024] = [1u8; 48 * 1024];
+
+// This large mutable array causes .data to use the rest of FLASH
+// without also overflowing RAM.
+static mut DATA: [u8; 16 * 1024] = [1u8; 16 * 1024];
+
+#[entry]
+fn main() -> ! {
+    unsafe {
+        let _bigdata = ptr::read_volatile(&RODATA as *const u8);
+        let _bigdata = ptr::read_volatile(&DATA as *const u8);
+    }
+
+    loop {}
+}