from esp_xtensa.c:31
#define ESP_XTENSA_DBGSTUBS_UPDATE_CODE_ENTRY(_e_) \
do { \
uint32_t __internal_val = (_e_); \
if (__internal_val == 0) { \
LOG_ERROR("No valid stub code entry found (0x%" PRIx32 ")!", __internal_val); \
return; \
} \
} while (0)