_start

XXXXXXX <-- SP


pushl %ebp

XXXXXXX
[oldBP:4] <-- SP


movl  %esp,%ebp

XXXXXXX
[oldBP:4] <-- SP  <-- EBP


addl  $lastLocal,%esp

XXXXXXX
[oldBP:4] <-- EBP
[result:2]
[totalWc:2] <-- SP


call  readword

XXXXXXX
[oldBP:4] <-- EBP  <-- oldBP(%ebp)
[result:2]         <-- result(%ebp)
[totalWc:2]        <-- totalWc(%ebp)
[retaddr:4] <-- SP





struct Rec
{
  int x, y, z;
  float a, b, c;
  char buffer[20];
};

struct Rec f(void)
{
  struct Rec temp;
  
  ...
  return temp;
}

void caller(void)
{
  struct Rec temp;
  
  temp = f();
}

aosdifjoasd <-- SP

   # assume Rec_size is the size of struct Rec
   
   subl  $Rec_size,%esp
   pushl param3
   pushl param2
   pushl param1
   
aosdifjoasd
[...:Rec_size]
[param3:..]
[param2:..]
[param1:..] <-- SP

   call f

aosdifjoasd
[...:Rec_size]
[param3:..]
[param2:..]
[param1:..]
[retaddr:4]  <-- SP


f:
    pushl %ebp
    movl  %esp,%ebp
    addl  $lastLocal,%esp
    
aosdifjoasd
[...:Rec_size]
[param3:..]
[param2:..]
[param1:..]
[retaddr:4]
[oldBP:4] <-- EBP
[local1:..]
[local2:..]
[local3:..]  <-- SP



     ret
     
aosdifjoasd
[...:Rec_size]
[param3:..]
[param2:..]
[param1:..] <-- SP

     addl $..,%esp
     
aosdifjoasd
[...:Rec_size] <-- SP