30.1.1.1. AArch32
32-bit mode of operation of ARMv8.
Userland is highly / fully backwards compatible with ARMv7:
For this reason, QEMU and GAS seems to enable both AArch32 and ARMv7 under arm rather than aarch64.
There are however some extensions over ARMv7, many of them are functionality that ARMv8 has and that designers decided to backport on AArch32 as well, e.g.: