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usage

在使用 gdb debug 程式前,
compile 需要加 -g 產生 debug information

gcc -g

Do not print the introductory and copyright messages.

-quiet
-q "Quiet". Do not print the introductory and copyright messages. These messages are also suppressed in batch mode.

$ gdb a.out

GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from a.out...done.
(gdb)

$ gdb -q a.out

Reading symbols from a.out...done.
(gdb)

get the address of variable

(gdb) p &a

difference between (gdb)r with (gdb) start

break-through@breakthrough-ThinkPad-T460p:~/working_space/test/5$ gdb -q a.out
Reading symbols from a.out...done.
(gdb) r
Starting program: /home/break-through/working_space/test/5/a.out 
test.a = 1, test.b=2, test.c=3
[Inferior 1 (process 7607) exited normally]
(gdb) p &test.a
No symbol "test" in current context.

break-through@breakthrough-ThinkPad-T460p:~/working_space/test/5$ gdb -q a.out
Reading symbols from a.out...done.
(gdb) start
Temporary breakpoint 1 at 0x400535: file container_of.c, line 11.
Starting program: /home/break-through/working_space/test/5/a.out 

Temporary breakpoint 1, main () at container_of.c:11
11          test.a = 1;
(gdb) p &test.a
$1 = (int *) 0x7fffffffddb0

print source code

(gdb) list

Display assemble code

(gdb) disassemble

Setting breakpoint

(gdb) b line_number

澳门新葡亰官网APP,Clear breakpoint

(gdb) clear line_number

Deleting all breakpoints

(gdb) delete

Continue running your program (after stopping, e.g. at a breakpoint).

(gdb) c

澳门新葡亰app,Execute next program line

Step into

(gdb) step

Step over

(gdb) next

Watchpoint

Setting watchpoint

(gdb) watch variable_name

(gdb) start
(gdb) watch variable_name
(gdb) c
 // display the old value and new value of the variable if the value changes.
(gdb) c
 // display the old value and new value of the variable if the value changes.
(gdb) c
 // display the old value and new value of the variable if the value changes.
 .....
 .....
 .....

(gdb) start
(gdb) watch variable1_name - 5 + variable2_name
(gdb) c
 // display the old value and new value of the variable if the value changes.
(gdb) c
 // display the old value and new value of the variable if the value changes.
(gdb) c
 // display the old value and new value of the variable if the value changes.
 .....
 .....
 .....

(gdb) start
(gdb) watch *memory_address
(gdb) c
 // display the old content and new content of the memory_address if the content changes.
(gdb) c
 // display the old content and new content of the memory_address if the content changes.
(gdb) c
 // display the old content and new content of the memory_address if the content changes.
 .....
 .....
 .....

Deleting all watchpoints

(gdb) delete

Display register value

movl   $0x6,-0x4(%rbp)

(gdb) p $rbp-0x4

Show both source code and assemble code split using TUI (Text User Interface) mode.

gdb -tui <your-binary>

(gdb) layout split
(gdb) start

澳门新葡亰app 1


Show both source code and assemble code mixed.

(gdb) disassemble /m

澳门新葡亰app 2


Reference:

太多了!
To be continued

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