forked from OSchip/llvm-project
1408684957
This adds a new platform class, whose job is to enable running (debugging) executables under qemu. (For general information about qemu, I recommend reading the RFC thread on lldb-dev <https://lists.llvm.org/pipermail/lldb-dev/2021-October/017106.html>.) This initial patch implements the necessary boilerplate as well as the minimal amount of functionality needed to actually be able to do something useful (which, in this case means debugging a fully statically linked executable). The knobs necessary to emulate dynamically linked programs, as well as to control other aspects of qemu operation (the emulated cpu, for instance) will be added in subsequent patches. Same goes for the ability to automatically bind to the executables of the emulated architecture. Currently only two settings are available: - architecture: the architecture that we should emulate - emulator-path: the path to the emulator Even though this patch is relatively small, it doesn't lack subtleties that are worth calling out explicitly: - named sockets: qemu supports tcp and unix socket connections, both of them in the "forward connect" mode (qemu listening, lldb connecting). Forward TCP connections are impossible to realise in a race-free way. This is the reason why I chose unix sockets as they have larger, more structured names, which can guarantee that there are no collisions between concurrent connection attempts. - the above means that this code will not work on windows. I don't think that's an issue since user mode qemu does not support windows anyway. - Right now, I am leaving the code enabled for windows, but maybe it would be better to disable it (otoh, disabling it means windows developers can't check they don't break it) - qemu-user also does not support macOS, so one could contemplate disabling it there too. However, macOS does support named sockets, so one can even run the (mock) qemu tests there, and I think it'd be a shame to lose that. Differential Revision: https://reviews.llvm.org/D114509 |
||
|---|---|---|
| .. | ||
| bindings | ||
| cmake | ||
| docs | ||
| examples | ||
| include/lldb | ||
| packages/Python | ||
| resources | ||
| scripts | ||
| source | ||
| test | ||
| third_party/Python/module | ||
| tools | ||
| unittests | ||
| utils | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.txt | ||
| LICENSE.TXT | ||
| use_lldb_suite_root.py | ||