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beb55f726f
This commit lets us differentiate whether access faults are caused by accessing junk memory addresses given to us by userspace or if we hit a kernel bug. The stub implementations of the `safe_*` functions currently don't let us jump back into them and return a value indicating failure, so we panic if such a fault happens. Practically, this means that we still crash, but if the access violation was caused by something else, we take the usual kernel crash code path and print a register and memory dump, rather than hitting the `TODO_AARCH64` in `handle_safe_access_fault`.