tests/tcg/s390x: Add PSW modification tests

Add several small tests that check the PSW modification instructions:

* lpsw.S checks whether LPSW works correctly in the "happy" case.

* lpswe-early.S checks whether early exceptions are recognized and
  whether the correct ILC and old PSW are stored when they happen.

* ssm-early.S, stosm-early.S and exrl-ssm-early.S check the special
  handling of SSM and STOSM with respect to early exceptions.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230315020408.384766-4-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
6 files changed