4.3.2 __cmse_nonsecure_entry Keyword

The __cmse_nonsecure_entry keyword declares an entry function that can be called from the non-secure state. The execution state will be cleared before returning to the caller, to avoid leaking sensitive data to the non-secure state.

On XC32, it can only be used when passing -mcmse to compiler.

__cmse_nonsecure_entry void foo();

void __attribute__((cmse_nonsecure_entry)) foo();