如何编写 gdb 脚本(使用 python)?例子添加断点，运行，我们打到了什么断点?

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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(这让我可以通过 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 gdb 的一些脚本来自动化这个.

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

我想为 gdb 编写某种脚本，或多或少会这样做:

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

添加几个断点
启动程序
当我们停止时，它在哪里停止(获取帧信息)
退出.

有什么想法吗?

关于如何在 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 gdb 启动脚本中，该脚本或多或少看起来像这样.

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

而且这种作品，但不是很好.我如何使用新的和酷的"python 脚本来做到这一点，gdb 似乎支持.

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，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(其中之一?)替代的图形浏览器:

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 附加到发现运行的第一个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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