panic handler: Print correct PC & backtrace for debug exceptions

diff --git a/components/freertos/xtensa_vector_defaults.S b/components/freertos/xtensa_vector_defaults.S
index c800a09eda30e0167e6bee9786fb5f8f03b5e206..592dc323bd2928526b40dfca6897739ad1f34125 100644 (file)
--- a/components/freertos/xtensa_vector_defaults.S
+++ b/components/freertos/xtensa_vector_defaults.S
@@ -34,8 +34,14 @@ The default behaviour is to just exit the interrupt or call the panic handler on
 _xt_debugexception:
     movi    a0,PANIC_RSN_DEBUGEXCEPTION
     wsr     a0,EXCCAUSE
+    /* _xt_panic assumes a level 1 exception. As we're
+       crashing anyhow, copy EPC & EXCSAVE from DEBUGLEVEL
+       to level 1. */
+    rsr     a0,(EPC + XCHAL_DEBUGLEVEL)
+    wsr     a0,EPC_1
+    rsr     a0,(EXCSAVE + XCHAL_DEBUGLEVEL)
+    wsr     a0,EXCSAVE_1
     call0   _xt_panic                       /* does not return */
-    rsr     a0, EXCSAVE+XCHAL_DEBUGLEVEL
     rfi     XCHAL_DEBUGLEVEL
 
 #endif /* Debug exception */