tree deddc864f059073b29873bfb043f33955118a4bc
parent 59b243dcd58e625a019e544c791986f25cbbf93c
author Pierre Morel <pmorel@linux.ibm.com> 1594887801 +0200
committer Janosch Frank <frankja@linux.ibm.com> 1596184533 -0400

s390x: saving regs for interrupts

If we use multiple source of interrupts, for example, using SCLP
console to print information while using I/O interrupts, we need
to have a re-entrant register saving interruption handling.

Instead of saving at a static memory address, let's save the base
registers, the floating point registers and the floating point
control register on the stack in case of I/O interrupts

Note that we keep the static register saving to recover from the
RESET tests.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1594887809-10521-2-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>