[Info-vax] Android development Was Re: OT: Larry Ellison takes retirement as CEO of Oracle

[JF Mezei]

On 14-09-21 15:42, Johnny Billquist wrote:

> You normally do not branch to a driver. You make a system call.

>From an instruction flow at opcode level, when you ask to print "Hello
World", there will be a branch/call instruction to a system service
which will branch/call the driver which will perform whatever operations
are necessary to do the job. right ?

Question: when a use mode process calls a routine in a shareable image
that is installed with pivs,  what triggers the change in authorized
privs for the process (and what triggers its removal ?)

Does the OS check privs whenever code branches to a different page ?

Also, must all privileges granted to a shareable image by INSTALL be
specifically enabled by a routine, or are some granted/enabled by
default as soon as code branches to it ?