aarch64: GCC10: Add -mno-outline-atomics

GCC10 introduced by default calls to out-of-line helpers to implement
atomic operations with the '-moutline-atomic' option. This is breaking
several tests because the embedded calls are trying to access the
zephyr_data region from userspace that is declared as MT_P_RW_U_NA,
triggering a memory fault.

Since there is currently no support for MT_P_RW_U_RO (and probably never
will be), disable the out-of-line helpers disabling the GCC option.

Signed-off-by: Carlo Caione <[email protected]>

Author: carlocaione

arch/arm/core/aarch64/CMakeLists.txt

@@ -33,3 +33,5 @@ zephyr_library_sources_ifdef(CONFIG_CACHE_MANAGEMENT cache.c)
 if ((CONFIG_MP_NUM_CPUS GREATER 1) OR (CONFIG_SMP))
   zephyr_library_sources(smp.c)
 endif ()
+
+zephyr_cc_option_ifdef(CONFIG_USERSPACE -mno-outline-atomics)