Also, under what circumstances would thread local storage segments be
executable?

When the assembly-language source contains a statement such as
    .section my_section_name,"atx"
where the "atx" are the attributes of the ElfXX_Section.
See the key to the abbreviations in the output of
   readelf --sections a.elf
Namely:
-----
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  D (mbind), l (large), p (processor specific)
-----
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