Script started on Fri Sep 19 14:51:13 2003
linux3% nasm -f elf rep.asm
linux3% ld rep.o
linux3% 
linux3% gdb a.out
GNU gdb Red Hat Linux (5.2-2)
Copyright 2002 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 "i386-redhat-linux"...(no debugging symbols found)...

(gdb) display/i $eip
(gdb) display/x $edi
(gdb) display $ecx
(gdb) display/c $ebx
(gdb) display/c $eax

(gdb) break *find
Breakpoint 1 at 0x8048081
(gdb) break *erase
Breakpoint 2 at 0x8048095
(gdb) break *alldone
Breakpoint 3 at 0x80480a4
(gdb) run
Starting program: /afs/umbc.edu/users/c/h/chang/home/asm/a.out 

Breakpoint 1, 0x08048081 in find ()
5: /c $eax = 0 '\0'
4: /c $ebx = 0 '\0'
3: $ecx = 0
2: /x $edi = 0x0
1: x/i $eip  0x8048081 <find>:  mov    al,0x6f
(gdb) x/14cb &msg
0x80490b0 <msg>:        72 'H'  101 'e' 108 'l' 108 'l' 111 'o' 44 ','  32 ' '  119 'w'
0x80490b8 <msg+8>:      111 'o' 114 'r' 108 'l' 100 'd' 10 '\n' 0 '\0'
(gdb) si
0x08048083 in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 0
2: /x $edi = 0x0
1: x/i $eip  0x8048083 <find+2>:        mov    edi,0x80490b0
(gdb) 
0x08048088 in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 0
2: /x $edi = 0x80490b0
1: x/i $eip  0x8048088 <find+7>:        mov    ecx,0xd
(gdb) 
0x0804808d in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 13
2: /x $edi = 0x80490b0
1: x/i $eip  0x804808d <find+12>:       cld    
(gdb) 
0x0804808e in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 13
2: /x $edi = 0x80490b0
1: x/i $eip  0x804808e <find+13>:       repnz scas al,es:[edi]
(gdb) 
0x0804808e in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 12
2: /x $edi = 0x80490b1
1: x/i $eip  0x804808e <find+13>:       repnz scas al,es:[edi]
(gdb) 
0x0804808e in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 11
2: /x $edi = 0x80490b2
1: x/i $eip  0x804808e <find+13>:       repnz scas al,es:[edi]
(gdb) 
0x0804808e in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 10
2: /x $edi = 0x80490b3
1: x/i $eip  0x804808e <find+13>:       repnz scas al,es:[edi]
(gdb) 
0x0804808e in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 9
2: /x $edi = 0x80490b4
1: x/i $eip  0x804808e <find+13>:       repnz scas al,es:[edi]
(gdb) 
0x08048090 in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 8
2: /x $edi = 0x80490b5
1: x/i $eip  0x8048090 <find+15>:       jne    0x8048095 <not_found>
(gdb) 
0x08048092 in find ()
5: /c $eax = 111 'o'
4: /c $ebx = 0 '\0'
3: $ecx = 8
2: /x $edi = 0x80490b5
1: x/i $eip  0x8048092 <find+17>:       mov    bl,BYTE PTR [edi-1]
(gdb) 

Breakpoint 2, 0x08048095 in not_found ()
5: /c $eax = 111 'o'
4: /c $ebx = 111 'o'
3: $ecx = 8
2: /x $edi = 0x80490b5
1: x/i $eip  0x8048095 <not_found>:     mov    edi,0x80490b0
(gdb) 
0x0804809a in not_found ()
5: /c $eax = 111 'o'
4: /c $ebx = 111 'o'
3: $ecx = 8
2: /x $edi = 0x80490b0
1: x/i $eip  0x804809a <not_found+5>:   mov    ecx,0xd
(gdb) 
0x0804809f in not_found ()
5: /c $eax = 111 'o'
4: /c $ebx = 111 'o'
3: $ecx = 13
2: /x $edi = 0x80490b0
1: x/i $eip  0x804809f <not_found+10>:  mov    al,0x3f
(gdb) 
0x080480a1 in not_found ()
5: /c $eax = 63 '?'
4: /c $ebx = 111 'o'
3: $ecx = 13
2: /x $edi = 0x80490b0
1: x/i $eip  0x80480a1 <not_found+12>:  cld    
(gdb) 
0x080480a2 in not_found ()
5: /c $eax = 63 '?'
4: /c $ebx = 111 'o'
3: $ecx = 13
2: /x $edi = 0x80490b0
1: x/i $eip  0x80480a2 <not_found+13>:  repz stos es:[edi],al
(gdb) 
0x080480a2 in not_found ()
5: /c $eax = 63 '?'
4: /c $ebx = 111 'o'
3: $ecx = 12
2: /x $edi = 0x80490b1
1: x/i $eip  0x80480a2 <not_found+13>:  repz stos es:[edi],al
(gdb) 
0x080480a2 in not_found ()
5: /c $eax = 63 '?'
4: /c $ebx = 111 'o'
3: $ecx = 11
2: /x $edi = 0x80490b2
1: x/i $eip  0x80480a2 <not_found+13>:  repz stos es:[edi],al
(gdb) cont
Continuing.

Breakpoint 3, 0x080480a4 in alldone ()
5: /c $eax = 63 '?'
4: /c $ebx = 111 'o'
3: $ecx = 0
2: /x $edi = 0x80490bd
1: x/i $eip  0x80480a4 <alldone>:       mov    ebx,0x0
(gdb) x/14cb &msg
0x80490b0 <msg>:        63 '?'  63 '?'  63 '?'  63 '?'  63 '?'  63 '?'  63 '?'  63 '?'
0x80490b8 <msg+8>:      63 '?'  63 '?'  63 '?'  63 '?'  63 '?'  0 '\0'
(gdb) cont
Continuing.

Program exited normally.
(gdb) quit
linux3% exit
exit

Script done on Fri Sep 19 14:53:17 2003