Warning: indirect call without `*'

Question

Having this simple assembly:

.text
    .globl main
str:
    .asciz "%i\n"
add:
    push %rbp
    mov %rsp, %rbp
    movl %esi, %eax
    addl %edi, %eax
    pop %rbp
    ret

main:
    mov $1, %esi
    mov $2, %edi
    lea add(%rip), %rax
    call %rax #what is wrong here? the rax should contain first instruction of add
    mov %eax, %esi
    xor %eax, %eax
    lea str(%rip), %rdi
    call printf
    xor %eax, %eax
    ret

I am getting error:

foo.s:17: Warning: indirect call without `*'

Why? The %rax should contain the address of function (as denoted in comment), and this is not c, where there are pointer with *, but register that contains an address. So what is wrong here?

Answer 1

Change

call %rax

to

call *%rax

This is not the same as call *(%rax). From @interjay's comment below:

call *%rax calls the address stored in rax (which is what OP wants to do), while call *(%rax) calls the address stored in memory pointed to by rax

The asterisk indicates that the call is an indirect call. It means call function stored inside %rax