Anropa assembler i C

//main.c
main()
{
   int i = sqr(11);
   printf("%d\n",i);
}

//sqr.s
.globl sqr
sqr:
   movl 4(%esp), %eax
   imull %eax, %eax
   ret

//print.c
print(int i)
{
   printf("%d\n",i);
}

//main.s
.globl main
main:
   movl $123, %eax
   pushl %eax
   call print
   addl $4, %esp
   ret

//sqr.s
.globl sqr
sqr:
   movl 8(%rsp), %rax
   imull %eax, %rax
   ret