xen/arm: traps: Avoid using BUG_ON() to check guest state in advance_pc()

xen/arm: traps: Avoid using BUG_ON() to check guest state in advance_pc()

The condition of the BUG_ON() in advance_pc() is pretty wrong because
the bits [26:25] and [15:10] have a different meaning between AArch32
and AArch64 state.

On AArch32, they are used to store PSTATE.IT. On AArch64, they are RES0
or used for new feature (e.g ARMv8.0-SSBS, ARMv8.5-BTI).

This means a 64-bit guest will hit the BUG_ON() if it is trying to use
any of these features.

More generally, RES0 means that the bits is reserved for future use. So
crashing the host is definitely not the right solution.

In this particular case, we only need to know the guest was using 32-bit
Mode and the Thumb instructions. So replace the BUG_ON() by a proper
check.

Reported-by: Lukas Jünger <lukas.juenger@ice.rwth-aachen.de>
Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>