使用 gdb/gdbserver 远程调试共享库 [英] Debugging shared libraries remotely with gdb/gdbserver

问题描述

我的问题是关于使用 gdb/gdbserver 在嵌入式 arm 处理器上远程调试应用程序.

My question is about remote debugging an application on an embedded arm processor using gdb/gdbserver.

我可以调试应用程序本身，但应用程序会动态链接到实现内部通信协议的共享库.我希望能够在共享库函数中设置断点，因此尝试找出一些设备发现问题.

I can debug the application itself, but the application dynamically links to a shared library which implements an in house communications protocol. I want to be able to set breakpoints within the shared library functions so try to figure out some device discovery problems.

我确保库是用调试符号编译的，并由主机端的 gdb 加载，我可以列出库中的函数，甚至设置断点，但是一旦我尝试运行应用程序，我就会得到一个错误消息的影响:

I have made sure that the library is compiled with debug symbols and is loaded by gdb on the host side, I can list functions within the library and even set the breakpoints but as soon as I try to run the application I get an error message to the effect of:

<代码>无法插入断点 X.
访问内存地址时出错:输入/输出错误.

其中 X 是 gdb 中的断点编号，并且是一个远小到有效的地址.
我在目标和主机上都使用了新库，但是通过 nfs 挂载在目标上的 mount -o bind newlib oldlib.
有没有人知道可能出什么问题?提前致谢.

where X is the breakpoint number in gdb and is an address far to small to be valid.
I am using the new library on both the target and the host machine, but via mount -o bind newlib oldlib on the target from an nfs mount.
Does anyone have an idea about what could be wrong? Thanks in advance.

推荐答案

疯狂猜测:您将共享库加载到主机 GDB 的地址不正确.

Wild guess: you loaded the shared library into host GDB at incorrect address.

不是显式加载到 GDB，而是使用 "set stop-on-solib-event on"，等待库加载(info shared 会告诉您当前加载的库列表)，然后然后设置断点.

Instead of explicitly loading it into GDB, use "set stop-on-solib-event on", wait for the library to get loaded (info shared will tell you current list of loaded libraries), and then set the breakpoints.

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