@ r0: endereco do comeco do vetor de structs
@ r1: valor
find_element:

    for:
        cmp r0, #0
        beq fim_for
        ldrh r2, [r0, #4]
        if:
            cmp r2, r1
            bne fim_for
            mov pc, lr
    fim_for:
        ldr r2, [r0]
        mov r0, r2
        b for

mov r0, #0
mov pc, lr