arch-arm: AArch32 execution triggering AArch64 SW Break

AArch32 Software Breakpoint (BKPT) can trigger an AArch64 fault when
interprocessing if the trapping conditions are met.

Change-Id: I485852ed19429f9cd928a6447a95eb6f471f189c
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/11197
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
5 files changed