where/how arm start first jump from svc to user in kernel

[vichy]

hi Mark:
>
>> BTW, Could we get the conclusion that ARMv7 = ARMv8 +aarch32?
>
> AArch32 in ARMv8 is largely the same as ARMv7, but there are some
> differences.
Would you mind to let me know where we can find the difference in spec
or some place else?

appreciate your kind help :)