Microkernel-based Operating Systems - Exercise 3, WS2019
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Download updated L4Re tarball for this exercise:

  https://os.inf.tu-dresden.de/Studium/KMB/WS2019/Exercise3.tar.bz2


Unpack and build it:
  #> cd /where/you/want
  #> tar xvf /where/you/put/Exercise3.tar.bz2
  #> cd tudos
  #> make setup
    ---> choose x86-32
  #> make -j8


The tarball also contained a template for this exercise in the ex3/ directory,
which is located next to tudos/: It contains source code for two programs:

  #> cd ..
  #> ls
  ex3
  tudos


The emplate contains two programs:

  ex3/src/faulty    -- a very simple "hello world" program
  ex3/src/executor  -- a skeleton for an application launcher

Build 'faulty' and the (still empty) 'executor' programs:
  #> make -C ex3


The modules.list file in tudos/src/l4/conf/modules.list contains two
preconfigured entries for this exercise:

  entry faulty
  roottask moe --init=rom/faulty
  module l4re
  module faulty
  
  entry executor
  roottask moe --init=rom/executor
  module l4re
  module executor
  module faulty


Run faulty in QEmu:
  #> make -C tudos/obj/l4/x86 qemu E=faulty

You should see an output line saying 'Hello, I am faulty.'.


Run executor in QEmu:
  #> make -C tudos/obj/l4/x86 qemu E=executor

You should see an output line saying 'Hello, I am your executor!', but no
message from the 'faulty' program, because this program is not started at all.

We want to start faulty using our own program launcher. Extend
ex3/src/executor/executor.cc into a program loader and pager for 'faulty'. The
goal is to run the 'faulty' program in a new task and handle all page faults
until the program successfully prints 'Hello, I am faulty.'.