void f(int a, int b)
{
  a += b;
}

f(2,43)

parameter a needs to have a lower address than parameter b

caller's code:

push $43
push $2
call f
addl $8,%esp

<b:4>
<a:4>
<retaddr:4>
<oldEbp:4> <- ebp

oldEbp_offset = 0
retaddr_offset = oldEbp_offset + 4
a_offset = retaddr_offset + 4
b_offset = a_offset + 4

f:
  # entry
  push %ebp
  movl %esp,%ebp
  
  push %eax
  movl b_offset(%ebp),%eax
  addl %eax,a_offset(%ebp)
  pop  %eax
  
  
  # exit
  movl %ebp,%esp
  pop  %ebp
  ret