dobrien@linux:~/ca647/labs/lab01> gcc -g -static -mpreferred-stack-boundary=2 -o program program.c
dobrien@linux:~/ca647/labs/lab01> gdb program
GNU gdb 6.1
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i586-suse-linux"...Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) info file
Symbols from "/home/dobrien/ca647/labs/lab01/program".
Local exec file:
        `/home/dobrien/ca647/labs/lab01/program', file type elf32-i386.
        Entry point: 0x8048140
        0x0804810c - 0x08048123 is .init
        0x08048140 - 0x08092a01 is .text
        0x08092a10 - 0x08092f6c is __libc_freeres_fn
        0x08092f6c - 0x08092f86 is .fini
        0x08092fa0 - 0x080a6380 is .rodata
        0x080a6380 - 0x080a6384 is __libc_atexit
        0x080a6384 - 0x080a63b0 is __libc_subfreeres
        0x080a73c0 - 0x082a7fdc is .data
        0x082a7fdc - 0x082a8f04 is .eh_frame
        0x082a8f04 - 0x082a8f0c is .ctors
        0x082a8f0c - 0x082a8f14 is .dtors
        0x082a8f14 - 0x082a8f18 is .jcr
        0x082a8f18 - 0x082a8f28 is .got
        0x082a8f40 - 0x084a9be0 is .bss
        0x084a9be0 - 0x084a9bf4 is __libc_freeres_ptrs
        0x080480d4 - 0x080480f4 is .note.ABI-tag
        0x080480f4 - 0x0804810c is .note.SuSE
(gdb) info symbol main
main in section .text
(gdb) info addr main
Symbol "main" is a function at address 0x80482b0.
(gdb) info symbol &z
z in section .data
(gdb) print &z
$1 = (int *) 0x82a73e0
(gdb) print z
$2 = 101
(gdb) info addr z
Symbol "z" is static storage at address 0x82a73e0.
(gdb) break main
Breakpoint 1 at 0x80482b9: file program.c, line 72.
(gdb) run
Starting program: /home/dobrien/ca647/labs/lab01/program

Breakpoint 1, main (argc=1, argv=0xbfffe754) at program.c:72
72              if (argc != 1) {
(gdb) info frame
Stack level 0, frame at 0xbfffe520:
 eip = 0x80482b9 in main (program.c:72); saved eip 0x8048540
 source language c.
 Arglist at 0xbfffe518, args: argc=1, argv=0xbfffe754
 Locals at 0xbfffe518, Previous frame's sp is 0xbfffe520
 Saved registers:
  ebp at 0xbfffe518, eip at 0xbfffe51c
(gdb) print &local
$3 = (char (*)[128]) 0xbfffe498
(gdb) info reg
eax            0x1      1
ecx            0xbfffe754       -1073748140
edx            0x0      0
ebx            0x0      0
esp            0xbfffe48c       0xbfffe48c
ebp            0xbfffe518       0xbfffe518
esi            0x80486d0        134514384
edi            0x3      3
eip            0x80482b9        0x80482b9
eflags         0x200292 2097810
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x0      0
(gdb) step
78              (void) strcpy(local, "I am a C program");
(gdb) step
strcpy () at ../sysdeps/i386/i586/strcpy.S:41
41      ../sysdeps/i386/i586/strcpy.S: No such file or directory.
        in ../sysdeps/i386/i586/strcpy.S
Current language:  auto; currently asm
(gdb) finish
Run till exit from #0  strcpy () at ../sysdeps/i386/i586/strcpy.S:41
0x080482ec in main (argc=1, argv=0xbfffe754) at program.c:78
78              (void) strcpy(local, "I am a C program");
Current language:  auto; currently c
(gdb) x/s local
0xbfffe498:      "I am a C program"
(gdb) disass main
Dump of assembler code for function main:
0x080482b0 <main+0>:    push   %ebp
0x080482b1 <main+1>:    mov    %esp,%ebp
0x080482b3 <main+3>:    sub    $0x8c,%esp
0x080482b9 <main+9>:    cmpl   $0x1,0x8(%ebp)
0x080482bd <main+13>:   je     0x80482de <main+46>
0x080482bf <main+15>:   mov    0xc(%ebp),%eax
0x080482c2 <main+18>:   pushl  (%eax)
0x080482c4 <main+20>:   push   $0x8092fba
0x080482c9 <main+25>:   pushl  0x82a7894
0x080482cf <main+31>:   call   0x8048980 <fprintf>
0x080482d4 <main+36>:   add    $0xc,%esp
0x080482d7 <main+39>:   push   $0x1
0x080482d9 <main+41>:   call   0x80487a0 <exit>
0x080482de <main+46>:   push   $0x8092fc5
0x080482e3 <main+51>:   lea    0xffffff80(%ebp),%eax
0x080482e6 <main+54>:   push   %eax
0x080482e7 <main+55>:   call   0x8052180 <strcpy>
0x080482ec <main+60>:   add    $0x8,%esp
0x080482ef <main+63>:   push   $0x200000
0x080482f4 <main+68>:   call   0x80511e0 <__libc_malloc>
0x080482f9 <main+73>:   add    $0x4,%esp
0x080482fc <main+76>:   mov    %eax,0xffffff74(%ebp)
0x08048302 <main+82>:   cmpl   $0x0,0xffffff74(%ebp)
0x08048309 <main+89>:   jne    0x804831c <main+108>
0x0804830b <main+91>:   push   $0x0
0x0804830d <main+93>:   call   0x8048a90 <perror>
0x08048312 <main+98>:   add    $0x4,%esp
0x08048315 <main+101>:  push   $0x1
0x08048317 <main+103>:  call   0x80487a0 <exit>
0x0804831c <main+108>:  push   $0x8092fd6
0x08048321 <main+113>:  pushl  0xffffff74(%ebp)
0x08048327 <main+119>:  call   0x8052180 <strcpy>
0x0804832c <main+124>:  add    $0x8,%esp
0x0804832f <main+127>:  pushl  0xffffff74(%ebp)
0x08048335 <main+133>:  call   0x804f550 <__libc_free>
0x0804833a <main+138>:  add    $0x4,%esp
0x0804833d <main+141>:  movl   $0x5,0xffffff7c(%ebp)
0x08048347 <main+151>:  pushl  0xffffff7c(%ebp)
0x0804834d <main+157>:  call   0x8048244 <sumup>
0x08048352 <main+162>:  add    $0x4,%esp
0x08048355 <main+165>:  mov    %eax,0xffffff78(%ebp)
0x0804835b <main+171>:  lea    0xffffff78(%ebp),%eax
0x08048361 <main+177>:  push   %eax
0x08048362 <main+178>:  lea    0xffffff7c(%ebp),%eax
0x08048368 <main+184>:  push   %eax
0x08048369 <main+185>:  call   0x8048277 <swap>
0x0804836e <main+190>:  add    $0x8,%esp
---Type <return> to continue, or q <return> to quit---
0x08048371 <main+193>:  mov    $0x0,%eax
0x08048376 <main+198>:  leave
0x08048377 <main+199>:  ret
End of assembler dump.
(gdb) quit
The program is running.  Exit anyway? (y or n) y
dobrien@linux:~/ca647/labs/lab01> emacs session.txt &
[1] 4333
dobrien@linux:~/ca647/labs/lab01>