From 627452e85c893201055bd555c45114e0b3beb271 Mon Sep 17 00:00:00 2001
From: Dong Heng <dongheng@espressif.com>
Date: Wed, 18 Jul 2018 10:26:15 +0800
Subject: [PATCH] bugfix(freertos): CPU switch from kernel to user mode

---
 components/freertos/port/esp8266/xtensa_vectors.S | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/components/freertos/port/esp8266/xtensa_vectors.S b/components/freertos/port/esp8266/xtensa_vectors.S
index e830748f..4641049b 100644
--- a/components/freertos/port/esp8266/xtensa_vectors.S
+++ b/components/freertos/port/esp8266/xtensa_vectors.S
@@ -1521,9 +1521,15 @@ _xt_ext_panic:
      *
      * Todo: Close NMI
      */
-    rsil    a0, XCHAL_EXCM_LEVEL
+    rsil    a0, PS_INTLEVEL(5)
     wsr     a0, EXCSAVE_2
 
+    /*
+     * CPU must switch from kernel mode to user mode
+     */
+    movi    a0, PS_INTLEVEL(5) | PS_UM
+    wsr     a0, PS
+
     /* Allocate exception frame and save minimal context. */
     mov     a0, sp
     movi    sp, _chip_interrupt_tmp