1 files changed, 4 insertions, 1 deletions
diff --git a/stmhal/pendsv.h b/stmhal/pendsv.h
index f91a7c1d7..7886d9f98 100644
--- a/stmhal/pendsv.h
+++ b/stmhal/pendsv.h
@@ -26,4 +26,7 @@
 
 void pendsv_init(void);
 void pendsv_nlr_jump(void *val);
-void pendsv_isr_handler(void);
+
+// since we play tricks with the stack, the compiler must not generate a
+// prelude for this function
+void pendsv_isr_handler(void) __attribute__((naked));