target/arm: Define arm_cpu_do_unaligned_access for user-only

target/arm: Define arm_cpu_do_unaligned_access for user-only

Use the same code as system mode, so that we generate the same
exception + syndrome for the unaligned access.

For the moment, if MTE is enabled so that this path is reachable,
this would generate a SIGSEGV in the user-only cpu_loop.  Decoding
the syndrome to produce the proper SIGBUS will be done later.

Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
Message-id: 20200626033144[email protected]
Signed-off-by: Peter Maydell <[email protected]>