1. GNU Debugger

7. Debugger!

9. Debugger ?

11. bug

12. ?

13. !

14. bug
?

15. debug

16. ↑ ↑ ↓ ↓ ← → ← → BA

17. printf

19. RUNTIME
TRACING

20. DYNAMIC
ANALYSIS

21. •
•
•
•
•

22. Good
and
Evil

23. Good
and
Evil

24. White
and
Black

25. White -box
and
Black -box

26. Debug
Event

27. Breakpoints

28. soft
Breakpoint

29. hardware
Breakpoint

30. memory
Breakpoint

31. Memory violation

32. Memory violation
(segmentation faults)

33. Exceptions

35. GDB

36. ?

38. $ gcc test.c -o test.o
$ ./test.o

39. $ gcc -g test.c -o test.o
$ gdb test.o

40. file
run
start main break
Ctrl+c
list [line/function]
print [var]
next [times]
step [times]
until [line]
continue
finish function
jump [line]
info [command] (ex:info break)

41. Breakpoint
help breakpoints breakpoints
break [line] breakpoint
break [function]
info break breakpoints
delete [n] breakpoint ( )
clear [line] breakpoint ( )
enable [n] breakpoint ( )
enable once [n] breakpoint break
disable [n] breakpoint ( )
ignore [n] [cont] breakpoint ( ) (cont )
condition [n] [cond] cond break
break [line] [cond]
break 10 if n > 5
commands [n] break ,

42. watchpoint
watch [var] var break
rwatch [var] var break
awatch [var] var
info watch break watch point

43. display
step next
display [var] display
undisplay [n] n display
enable display n display
[n]
disable display n display
[n] display
info display table

44. function calls
backtrace function stack
up
down
frame [n] frame
return [var] return

47. • (gdb) help all
• (gdb) help
• Reference

49. gdbtui ccdebug Xcode
cgdb Glewn GDBtk/Insight
Xxgdb Emacs WDB
GVD DDD Dev-c
Nemiver KDb ........

50. gdbtui ccdebug Xcode
cgdb Glewn GDBtk/Insight
Xxgdb Emacs WDB
GVD DDD Dev-c
Nemiver KDb ........

51. gdbtui ccdebug Xcode
cgdb Glewn GDBtk/Insight
Xxgdb Emacs WDB
GVD DDD Dev-c
Nemiver KDb ........

56. GDB

57. Reference
• GNU
http://www.gnu.org/software/gdb/
• GNU Debugger (gdb) Part I
http://jserv.sayya.org/debugger/HappyGDB-PartI-2008-07-12.pdf
• debugger GNU GDB
http://cse.tw/981class/file/upe3.pdf
• Gray Hat Python
• http://www.cmlab.csie.ntu.edu.tw/~daniel/linux/gdb.html
• http://www.study-area.org/cyril/opentools/opentools/
x1253.html

58. Q&A