> For the complete documentation index, see [llms.txt](https://docs.hex-rays.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hex-rays.com/8.4/user-guide/debugger/remote-debugging/remote-gdb-debugger/debugging-with-qemu.md).

# Debugging with QEMU

Run QEMU with -s switch to enable its GDB stub. The default port number is 1234. If desired, the -p command line switch can be used to change it. The -S command line switch causes the execution to be suspended at startup. For example:

```
 qemu.exe -s -S -L . -m 128 -hda linux.img -soundhw all -localtime -M pc
```

For better debugging, make sure to set the following options in [GDB Debugger options](/8.4/user-guide/debugger/remote-debugging/remote-gdb-debugger/remote-gdb-debugger-options.md):

```
 Software breakpoints at EIP+1: disabled
 Use CS:IP in real mode: enabled (when debugging 16-bit (real-mode) code)
```

In other aspects debugging with QEMU is the same as debugging for other targets.

Back to [Remote GDB Debugger](/8.4/user-guide/debugger/remote-debugging/remote-gdb-debugger.md)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.hex-rays.com/8.4/user-guide/debugger/remote-debugging/remote-gdb-debugger/debugging-with-qemu.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.