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A collection of gdb tips. 100 maybe just mean many here.

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100-gdb-tips's Issues

建设增加使用文件来调试正在运行程序

-pid number
-p number
连接到进程ID 号
-command file
-x file
从file文件执行命令

ex:ps -x | grep 进程名
获取进程id 例: 2018
ex: gdb -pid 2018 -x gdb.txt

gdb.txt文件内容格式如:
b main.cpp:20
c
p a
q

本来想自己写一个md文件上传到分支的, 但创建一看, 编辑格式没找到, 上传了一个空文档

修改被调试程序的二进制文件，出现 Segmentation fault

$ gdb --write hello
GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 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 hello...done.

(gdb)  disassemble /mr drawing
Dump of assembler code for function drawing:
6       {
   0x00000000000007d0 <+0>:     55      push   %rbp
   0x00000000000007d1 <+1>:     48 89 e5        mov    %rsp,%rbp
   0x00000000000007d4 <+4>:     48 83 ec 10     sub    $0x10,%rsp
   0x00000000000007d8 <+8>:     89 7d fc        mov    %edi,-0x4(%rbp)

7           if (n != 0)
   0x00000000000007db <+11>:    83 7d fc 00     cmpl   $0x0,-0x4(%rbp)
   0x00000000000007df <+15>:    74 0e   je     0x7ef <drawing+31>

8               puts ("Try again?\nAll you need is a dollar, and a dream.");
   0x00000000000007e1 <+17>:    48 8d 3d 40 01 00 00    lea    0x140(%rip),%rdi        # 0x928
   0x00000000000007e8 <+24>:    e8 53 fe ff ff  callq  0x640 <puts@plt>

9           else
10              puts ("You win $3000!");
   0x00000000000007ef <+31>:    48 8d 3d 64 01 00 00    lea    0x164(%rip),%rdi        # 0x95a
   0x00000000000007f6 <+38>:    e8 45 fe ff ff  callq  0x640 <puts@plt>

11      }
   0x00000000000007ed <+29>:    eb 0c   jmp    0x7fb <drawing+43>
   0x00000000000007fb <+43>:    90      nop
   0x00000000000007fc <+44>:    c9      leaveq
   0x00000000000007fd <+45>:    c3      retq

End of assembler dump.

(gdb) set variable *(short*)0x00000000000007df=0x0ceb
(gdb)  disassemble /mr drawing
Dump of assembler code for function drawing:
6       {
   0x00000000000007d0 <+0>:     55      push   %rbp
   0x00000000000007d1 <+1>:     48 89 e5        mov    %rsp,%rbp
   0x00000000000007d4 <+4>:     48 83 ec 10     sub    $0x10,%rsp
   0x00000000000007d8 <+8>:     89 7d fc        mov    %edi,-0x4(%rbp)

7           if (n != 0)
   0x00000000000007db <+11>:    83 7d fc 00     cmpl   $0x0,-0x4(%rbp)
   0x00000000000007df <+15>:    eb 0c   jmp    0x7ed <drawing+29>

8               puts ("Try again?\nAll you need is a dollar, and a dream.");
   0x00000000000007e1 <+17>:    48 8d 3d 40 01 00 00    lea    0x140(%rip),%rdi        # 0x928
   0x00000000000007e8 <+24>:    e8 53 fe ff ff  callq  0x640 <puts@plt>

9           else
10              puts ("You win $3000!");
   0x00000000000007ef <+31>:    48 8d 3d 64 01 00 00    lea    0x164(%rip),%rdi        # 0x95a
   0x00000000000007f6 <+38>:    e8 45 fe ff ff  callq  0x640 <puts@plt>

11      }
   0x00000000000007ed <+29>:    eb 0c   jmp    0x7fb <drawing+43>
   0x00000000000007fb <+43>:    90      nop
   0x00000000000007fc <+44>:    c9      leaveq
   0x00000000000007fd <+45>:    c3      retq

End of assembler dump.
(gdb) q
Segmentation fault

必须要有ref啊

这个太常用了

有些重要的介绍的还太浅

感觉有些实用的东西，比如core dump文件的分析，这在调试工程中是重点分析对象，应该介绍怎样用where、bt等命令分析core dump，从而找出问题所在，这才是关键呢。

set step-mode off 无效

我阅读了“step-and-next-function.md” 以后，
如果函数没有调试信息，我就希望step不要进入函数里面去，
可是，我执行set step-mode off 以后，却发现step，依旧可以进入printf，printf是没有调试信息的函数，
请问是为啥呢？有什么办法可以，让step不要进入没有调试信息的函数里面去吗？

(gdb) set step-mode off 
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/lc/Desktop/a.out 

Breakpoint 1, main () at ss.c:13
13	int main(void) {
(gdb) s
14	        ex_st st = {1, 2, 3, 4, PTHREAD_MUTEX_INITIALIZER};
(gdb) 
15	        printf("%d,%d,%d,%d\n", st.a, st.b, st.c, st.d);
(gdb) 
__printf (format=0x4006d4 "%d,%d,%d,%d\n") at printf.c:28
28	printf.c: No such file or directory.
(gdb)

gitbooks托管一个吧

http://gitbooks.io/

做一个吧

Better if publish it as a web site

It's inconvenient for us to view the tips. As we should 1) clone the repository, 2) prepare go build environment, 3) generate html files.

So maybe it's better to publish it as a site (e.x., 100-gbd-tips.github.io). Two ways to do this:

Contributor submit new tips by pull requests, repository owner merge commits, generate html and publish it.
Use jekyll instead of md2min, which need to change format of existing markdown files.

Example: https://github.com/sib9/cpp1x-study-resource

hellogcc / 100-gdb-tips Goto Github PK

100-gdb-tips's People

Contributors

Stargazers

Watchers

Forkers

100-gdb-tips's Issues

建设增加使用文件来调试正在运行程序

修改被调试程序的二进制文件，出现 Segmentation fault

必须要有ref啊

有些重要的介绍的还太浅

set step-mode off 无效

gitbooks托管一个吧

Better if publish it as a web site

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