如何编写 gdb 脚本(使用 python)?示例添加断点，运行，我们打的是什么断点? [英] How to script gdb (with python)? Example add breakpoints, run, what breakpoint did we hit?

问题描述

我正在尝试使用 gdb 创建一个小单元测试，对于由 OpenOCD 控制的嵌入式 mcu(这使我可以通过 gdb 服务器控制我的目标).

I'm trying to create a little unit test with gdb, for a embedded mcu that is controlled by OpenOCD (that gives me control over my target via a gdb server).

所以我想用一些 gdb 脚本来自动化这个.

So I would like to automate this with some scripting of gdb.

我想为 gdb 编写某种或多或少的脚本:

I would like to write some kind of script for gdb that more or less does this:

1. 添加几个断点
2. 启动程序
3. 当我们停止时，它在哪里停止(获取帧信息)
4. 退出.

有什么想法吗?

如何在 python gdb 脚本中执行此操作的示例会很好.

A example on how to do this in python gdb scripting would be nice.

谢谢约翰

注意:

假设我们有这个基本结构，或多或少进入 test_failed() 或 test_success()取决于函数 start_test() 返回的内容.

Let's say that we have this basic structure, that more or less goes into test_failed() or test_success() depending on what the function start_test() returns.

void test_failed() {    
    while(1);    
}

void test_success() {    
    while(1);    
}

int main(void) {    
    int status = start_test();    

    if( status > 0 ) {    
        test_failed();    
    }    
    test_success();

    while(1);    
}

在 gdb 中手动执行此操作非常困难，

To do this manually in gdb is very strait forward,

(gdb) break test_success
Breakpoint 1 at 0x20: file src/main.c, line 9.
(gdb) break test_failed
Breakpoint 2 at 0x18: file src/main.c, line 5.
(gdb) cont
Continuing.

Breakpoint 1, test_success () at src/main.c:9
9       while(1);
(gdb) frame
#0  test_success () at src/main.c:9
9       while(1);
(gdb) 

所以我尝试的下一步是将这些 gdb 命令添加到或多或少看起来像这样的 gdb 启动脚本中.

So the next step I tried was to add those gdb commands into a gdb startup script that more or less just looked like this.

break test_success
break test_failed
target remote localhost:3333
cont 
frame

并以

arm-none-eabi-gdb --batch --command=commands.gdb main.elf

这种工作，但不是很好.我如何使用新的和酷的"python 脚本来做到这一点，那个gdb好像支持.

And this kind of works, but it is not very nice. How do I do this with the "new and cool" python scripts, that gdb seem to support.

推荐答案

仅供参考，最近的 gdb 版本可以在 Python 中编写脚本.您可以从 gdb 命令行调用 python 代码.这打开了一个全新的世界，请查看相关文档.从命令行运行:

FYI recent gdb versions are scriptable in Python. You can call python code from the gdb command line. This opens a whole new world, check the relevant documentation. From the command line run:

 dnf/yum/apt-get install gdb-doc
 info gdb extending python

如果您不喜欢基于文本的信息浏览器，这里有一个(在众多?)替代图形浏览器:

If you do not like the text-based info browser, here is one (among many?) alternative, graphical browser:

yelp 'info:gdb' # , go to "Extending"

这是一个示例 gdb-python 脚本.它将 gdb 附加到第一个正在运行的your_program".

Here is a sample gdb-python script. It attaches gdb to the first "your_program" found running.

#!/usr/bin/python

import subprocess
import string

def backquotes(cmdwords):
        output = subprocess.Popen(cmdwords, stdout=subprocess.PIPE).communicate()[0]
        return output.strip()

pid = backquotes(['pgrep', 'your_program'])

gdb.execute("attach " + str(pid))

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