To provide software compatibility with VMSAv7 implementations
that include the Security Extensions, in Secure AArch32 state, all
modes other than User mode must have the same execution privilege.
This means that, in an implementation where EL3 is using AArch32,
the security model is as shown in following figure. This figure also shows the expected
use of the different Exception levels and processor modes.
Figure 3-2 ARMv8 security model when EL3 is using AArch32