arm64: mte: Handle synchronous and asynchronous tag check faults
The Memory Tagging Extension has two modes of notifying a tag check fault at EL0, configurable through the SCTLR_EL1.TCF0 field: 1. Synchronous raising of a Data Abort exception with DFSC 17. 2. Asynchronous setting of a cumulative bit in TFSRE0_EL1. Add the exception handler for the synchronous exception and handling of the asynchronous TFSRE0_EL1.TF0 bit setting via a new TIF flag in do_notify_resume(). On a tag check failure in user-space, whether synchronous or asynchronous, a SIGSEGV will be raised on the faulting thread. Signed-off-by:Vincenzo Frascino <vincenzo.frascino@arm.com> Co-developed-by:
Catalin Marinas <catalin.marinas@arm.com> Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org>
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