Merge branch 'bugfix/xtensa_startup_stack' into 'master'

fix(system): fixed potential double exception when booting on xtensa

Closes IDFGH-13515

See merge request espressif/esp-idf!33190

Author: ESP-Marius

components/freertos/FreeRTOS-Kernel-SMP/portable/xtensa/port.c

@@ -348,6 +348,11 @@ BaseType_t xPortStartScheduler( void )
     }
 #endif // configNUM_CORES > 1
 
+    // Windows contain references to the startup stack which will be reclaimed by the main task
+    // Spill the windows to create a clean environment to ensure we do not carry over any such references
+    // to invalid SPs which will cause problems if main_task does a windowoverflow to them
+    xthal_window_spill();
+
     // Cannot be directly called from C; never returns
     __asm__ volatile ("call0    _frxt_dispatch\n");
 

components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c

@@ -108,6 +108,11 @@ BaseType_t xPortStartScheduler( void )
 
     port_xSchedulerRunning[xPortGetCoreID()] = 1;
 
+    // Windows contain references to the startup stack which will be reclaimed by the main task
+    // Spill the windows to create a clean environment to ensure we do not carry over any such references
+    // to invalid SPs which will cause problems if main_task does a windowoverflow to them
+    xthal_window_spill();
+
     // Cannot be directly called from C; never returns
     __asm__ volatile ("call0    _frxt_dispatch\n");