如何强制GDB执行没有符号的代码
我有一个 C 程序（有充分的理由）分配内存，向其中复制一些代码，使用 mprotect() 赋予它执行权限，然后调用该代码。 是的，我知道这是不可移植且不安全的，但这是有充分理由的。 不管怎样，我需要通过汇编代码（使用 si 命令）使用 gdb 单步执行，但它不允许我——它一直说： “没有函数包含所选帧的程序计数器”
有没有办法强制 gdb 执行此代码？我是否应该使用另一个调试器来代替这种类型的事情？
谢谢！
I have a C program that (for good reason) allocates memory, copies some code to it, uses mprotect() to give it execute privileges, and then calls that code.
Yes I know this is unportable and unsafe, but there's a good reason.
Anyway, I need to single-step with gdb through the assembly code (using si command) but it won't let me -- it keeps saying:
"No function contains program counter for selected frame"
Is there a way to force gdb to execute this code? Is there another debugger that I should be using instead for this type of thing?
Thanks!
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似乎您需要
add-symbol-file' 或add-symbol-file-from-memory' 命令让 gdb 了解已复制到该内存位置的代码。
Seems like you want the
add-symbol-file', oradd-symbol-file-from-memory' commandsto let gdb know about the code that has been copied to that memory location.
在开始
si/stepi之前，您应该能够使用display/i $pc来跟踪您的代码。这告诉它在每次打印提示之前显示当前指令的反汇编。You should be able to follow through your code by using
display/i $pcbefore starting tosi/stepi. This tells it to show the disassembly of the current instruction just before printing the prompt each time.stepi命令本身不需要任何符号，并且应该在您描述的场景中很好工作（尽管我实际上没有检查它是否需要）。您的问题真的与
stepi有关吗？显示调试会话的相关部分可能会让您的问题得到更好的答案。The
stepicommand itself doesn't require any symbols and should work just fine in the scenario you described (though I haven't actually checked whether it does).Is your problem really with
stepi? Showing relevant part(s) of your debug session might open your question to better answers.