Lab 02 Part I
Addresses in descending hex order.

the bottom of main's stack frame (this is stored in register $fp)
   0x7fffffffe500
the top of main's stack frame (this is stored in register $sp)
   0x7fffffffe4e0
the local variable 'x' in main
   0x7fffffffe4e8
what 'x' is pointing to; the value of 'x'  is in heap-dynamic data section
   0x601010
the bottom of foobar's stack frame (this the stored in $fp)
   0x7fffffffe4d0
'w' in function foobar (this is an argument in foobar's stack frame)
   0x7fffffffe4bc
'y' in function foobar (this is a local var in foobar's stack frame)
   0x7fffffffe4c4
&MAX (this is a variable in the static data section)
   0x600930
the first instruction in main
   0x400513 
the last instruction in main
   0x400561

Visual depiction of process image from high to low addresses:

   --------------------------------------------
   | 0x7fffffffe500  bottom of main frame
   +-------------------------------------------
   | 0x7fffffffe4e8  local var x
   +-------------------------------------------
   | 0x7fffffffe4e0  bottom of main frame
   +-------------------------------------------
                    |
                    V 


                    ^
                    |
   --------------------------------------------
   | 0x601010     heap
   +-------------------------------------------
   | 0x600930   static data
   +-------------------------------------------
   | 0x400561 .text segment - last instruction in main
   | 0x400513 .text segment - first instruction in main
   +-------------------------------------------

Sample session:
(gdb) break main
Breakpoint 1 at 0x40051b: file lab02.c, line 79.
(gdb) break foobar
Breakpoint 2 at 0x4004f0: file lab02.c, line 72.
(gdb) run
Starting program: /home/fac/donna/public_html/cs224/examples/week02/lab02
Breakpoint 1, main () at lab02.c:79
79         int *x = (int *) malloc(sizeof(int));  // a ptr is stored in heap
(gdb) p $fp
$1 = (void *) 0x7fffffffe500
(gdb) p $sp
$2 = (void *) 0x7fffffffe4e0
(gdb)
(gdb) p &x
$2 = (int **) 0x7fffffffe4e8
(gdb) p x
$3 = (int *) 0x601010
(gdb) cont
Continuing.
Breakpoint 2, foobar (w=1, x=2.5) at lab02.c:72
72         y = w;
(gdb) p $fp
$4 = (void *) 0x7fffffffe4d0
(gdb) p &w
$5 = (int *) 0x7fffffffe4bc
(gdb) p &y
$6 = (int *) 0x7fffffffe4c4
(gdb) p &MAX
$7 = (int *) 0x600930
(gdb) p main
$8 = {int (void)} 0x400513 <main>
(gdb) s
73         z = x / y;
(gdb) s
74      }
(gdb) s
main () at lab02.c:83
83         int MAX = 5;
(gdb) p $pc
$9 = (void (*)()) 0x400561 <main+78>
(gdb) cont
Program exited normally.