How to declare a user-defined program section in C and Assembly respectively?

In C, we can declare a user-defined program section using the `section` attribute. For example:

void __attribute__((section("my_section"))) my_function() {
    // code goes here
}

In this example, the `my_function` is placed in a user-defined program section called `my_section`.

In Assembly, we can declare a user-defined program section using the `.section` directive. For example:

.section my_section
my_function:
    // code goes here

In this example, the `my_function` label is placed in a user-defined program section called `my_section`.