tree cea1260797f0c3af391c048a53f46db026221f87
parent 8bafae202c82dc257f649ea3c275a0f35ee15113
author Russell King <rmk+kernel@armlinux.org.uk> 1511781762 +0000
committer Russell King <rmk+kernel@armlinux.org.uk> 1511781762 +0000

ARM: avoid faulting on qemu

When qemu starts a kernel in a bare environment, the default SCR has
the AW and FW bits clear, which means that the kernel can't modify
the PSR A or PSR F bits, and means that FIQs and imprecise aborts are
always masked.

When running uboot under qemu, the AW and FW SCR bits are set, and the
kernel functions normally - and this is how real hardware behaves.

Fix this for qemu by ignoring the FIQ bit.

Fixes: 8bafae202c82 ("ARM: BUG if jumping to usermode address in kernel mode")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>