I was reading the kernel boot code toward the end where kernel's init thread
execve("/sbin/init",x,x). Execve() calls sys_execve() and do_execve(). All the
manpage and kernel document told us the init is the first usermode process
running in the system. However, when the execve("/sbin/init",x,x) runs in the
kernel (init/main.c), I believe we are still in the kernel mode, aren't we?
Unless execve() does the trick to turn init into usermode by setting the KU bit
in the STATUS register. I checked the execve() code and its not obvious whether
it does this or not. I then check the init source code and it does not mess
around the KU bit either.
My question is when and how does init turn itself into usermode.
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