GCC implements the ARMv8-M Security Extensions as described in the ARMv8-M Security Extensions: Requirements on Development Tools Engineering Specification, which can be found at https://developer.arm.com/documentation/ecm0359818/latest/.
As part of the Security Extensions GCC implements two new function attributes: cmse_nonsecure_entry and cmse_nonsecure_call.
As part of the Security Extensions GCC implements the intrinsics below. FPTR is used here to mean any function pointer type.
cmse_address_info_t cmse_TT (void *); cmse_address_info_t cmse_TT_fptr (FPTR); cmse_address_info_t cmse_TTT (void *); cmse_address_info_t cmse_TTT_fptr (FPTR); cmse_address_info_t cmse_TTA (void *); cmse_address_info_t cmse_TTA_fptr (FPTR); cmse_address_info_t cmse_TTAT (void *); cmse_address_info_t cmse_TTAT_fptr (FPTR); void * cmse_check_address_range (void *, size_t, int); typeof(p) cmse_nsfptr_create (FPTR p); intptr_t cmse_is_nsfptr (FPTR); int cmse_nonsecure_caller (void);
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https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/ARM-ARMv8-M-Security-Extensions.html