commit 6a8dbbadf79b245725d7c2fa56cc17c1f40cec54
author Håkon Øye Amundsen <haakon.amundsen@nordicsemi.no> Thu Oct 01 12:52:38 2020 +0000
committer Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no> Thu Oct 01 15:01:21 2020 +0200
tree d2d9f796a25a2fe9011fd2526080701fbb886716
parent 8ebe53537b21fafbb2319866c5b2d79bf0746392

boot: zephyr: reset SPLIM registers before boot

to avoid causing stack overflow in the image being booted.

Signed-off-by: Håkon Øye Amundsen <haakon.amundsen@nordicsemi.no>

boot/zephyr/main.c

diff --git a/boot/zephyr/main.c b/boot/zephyr/main.c
index d05939e..887ad6e 100644
--- a/boot/zephyr/main.c
+++ b/boot/zephyr/main.c
@@ -147,6 +147,15 @@
     cleanup_arm_nvic(); /* cleanup NVIC registers */
 #endif
 
+#if defined(CONFIG_BUILTIN_STACK_GUARD) && \
+    defined(CONFIG_CPU_CORTEX_M_HAS_SPLIM)
+    /* Reset limit registers to avoid inflicting stack overflow on image
+     * being booted.
+     */
+    __set_PSPLIM(0);
+    __set_MSPLIM(0);
+#endif
+
 #ifdef CONFIG_BOOT_INTR_VEC_RELOC
 #if defined(CONFIG_SW_VECTOR_RELAY)
     _vector_table_pointer = vt;