__iar_tls$$DATA
In this section:
Description
Holds the two sections .tdata and .tbss. Together they hold the thread-local storage area for the primary thread. The main use for this section is to use a size operator (__section_size, see Dedicated section operators) on it to obtain the size of the thread-local storage area. You can also use the operator __iar_tls$$DATA$$Align to obtain the alignment of the thread-local storage.
This section is created by the linker if the linker option ‑‑threaded_lib is used.