example of inline assembly

Question

I'm writing a C program that takes advantage of what is inline assembly.

How do I pass the address of a variable directly to a register?

int main(void){
    int pos0=0;
    asm(
        "ldr r4, =registro_pos0\n"
        "add r4, #5\n"
        "str r4, =registro_pos0\n"
    );
}

instead of register_pos0 I would like to insert the value of register pos0