revng
QEMU
revng | QEMU | |
---|---|---|
7 | 190 | |
1,201 | 9,350 | |
5.0% | 2.1% | |
9.6 | 10.0 | |
7 days ago | 1 day ago | |
C++ | C | |
GNU General Public License v3.0 only | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
revng
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The rev.ng decompiler goes open source
We should probably add a warning about `source ./environment`.
Now, let's get to each of your comments :D
> though thankfully not LD_LIBRARY_PATH
We spent a lot of time to have a completely self-contained set of binaries where each ELF refers to its dependencies through relative paths. LD_LIBRARY_PATH is evil.
> Mostly prefixed "HARD_"
Those are just used by our compiler wrappers, I don't think those environment variables collide with anything in practice.
> It sets `AWS_EC2_METADATA_DISABLED="true"`
Original discussion: https://github.com/revng/revng/pull/309#discussion_r12805759...
I guess we could patch the AWS SDK to avoid this.
- Revng translates (i386, x86-64, MIPS, ARM, AArch64, s390x) binaries to LLVM IR
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Ask HN: Which books do you consider real gems in your field of work/study?
Nielson & Nielson literally saved my PhD and enabled the creation of the company. I'm so grateful.
Do you have any contact? It'd be cool to invite one of the authors to our weekly internal meetings.
> the authors have written a prequel
Oh crap, that's great!
Honestly, we use Chapter 2 a lot, it already provides so much value. And in fact, you could write a whole book only about that.
Here's our C++ implementation of MFP:
https://github.com/revng/revng/blob/develop/include/revng/MFP/MFP.h#L66
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TMNT Shredder's Revenge has been ported to ARM-based Retro Handhelds!
I'm not certain, but my best guess right now is that the non-open-source games are going through a static binary translator (like this one). Going from a strong-memory-model ISA like x86_64 to a weak-memory-model ISA like ARM, can present performance challenges when memory fencing is added.
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C++ Jobs - Q3 2022
C++ 20 coroutines: we employ them to achieve "stackless C++";
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C++ Jobs - Q3 2021
C++20 Coroutines: we employ them to safely and idiomatically transistions from UI thread and long-running computation threads and "stackless C++""
QEMU
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QEMU Version 9.0.0 Released
My most-wanted QEMU feature: https://github.com/qemu/qemu/commit/a2260983c6553
Using `gic-version=3` on macOS you can now use more than 8 cores on ARM chips.
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Autoconf makes me think we stopped evolving too soon
A better solution is just to write a plain ass shell script that tests if various C snippets compile.
https://github.com/oilshell/oil/blob/master/configure
https://github.com/oilshell/oil/blob/master/build/detect-pwe...
Not an unholy mix of m4, shell, and C, all in the same file.
---
These are the same style as a the configure scripts that Fabrice Bellard wrote for tcc and QEMU.
They are plain ass shell scripts, because he actually understands the code he writes.
https://github.com/qemu/qemu/blob/master/configure
https://github.com/TinyCC/tinycc/blob/mob/configure
OCaml’s configure script is also “normal”.
You don’t have to copy and paste thousands of lines of GNU stuff that you don’t understand.
(copy of lobste.rs comment)
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WASM Instructions
Related:
A fast Pascal (Delphi) WebAssembly interpreter:
https://github.com/marat1961/wasm
WASM-4:
https://github.com/aduros/wasm4
Curated list of awesome things regarding WebAssembly (wasm) ecosystem:
https://github.com/mbasso/awesome-wasm
Also, it would be nice if there was a WASM (soft) CPU for QEMU, which (if it existed!) would go here:
https://github.com/qemu/qemu/tree/master/target
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Revng translates (i386, x86-64, MIPS, ARM, AArch64, s390x) binaries to LLVM IR
> architectural registers are always updated
In tiny code, the guest registers (global TCG variables) are stored in the host's registers until you either call an helper which can access the CPU state or you return (`git grep la_global_sync`). This is the reason why QEMU is not so terribly slow.
But after a check, this also happens when you access the guest memory address space! https://github.com/qemu/qemu/blob/master/include/tcg/tcg-opc... (TCG_OPF_SIDE_EFFECTS is what matters)
But still, in the end, it's the same problem. What QEMU does, can be done in LLVM too. You could probably be more efficient in LLVM by using the exception handling mechanism (invoke and friends) to only serialize back to memory when there's an actual exception, at the cost of higher register pressure. More or less what we do here: https://rev.ng/downloads/bar-2019-paper.pdf
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State of x86-64 emulation of non-MacOS binaries
Um, in case you don't know, UTM (based on QEMU) is out for quite a while.
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Multipass: Ubuntu Virtual Machines Made Easy
Some of these tools include Oracle VM VirtualBox (that I've used since before the acquisition of Sun Microsystems by Oracle), VMWare Workstation Player, and QEMU, but last year, I found out about Multipass.
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Libsodium: A modern, portable, easy to use crypto library
For C/C++ projects that use meson as the build system, there is an excellent way to manage dependencies:
https://mesonbuild.com/Wrapdb-projects.html
https://mesonbuild.com/Wrap-dependency-system-manual.html
meson will download and build the libraries automatically and give you a variable which you pass as a regular dependency into the built target:
https://github.com/qemu/qemu/tree/005ad32358f12fe9313a4a0191...
https://github.com/harfbuzz/harfbuzz/tree/main/subprojects
https://github.com/harfbuzz/harfbuzz/blob/37457412b3212463c5...
Or, if you're using proper operating systems, they're managed by the usual package manager, just like everything else.
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Top 6 Virtual Machine Software in 2023
For all the users of the Linux platform, QEMU is the VM that you should go for. This software comes without any price tag and works as an emulator of various machines with utmost ease and completion; the software uses dynamic translations to emulate hardware peripherals and enhances its overall performance. If you are using QEMU as a virtualizer, then it will function exactly like the host system (provided you have the right set of hardware).
- Show HN: I'm 17 and wrote this guide on how CPUs run programs
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UTM for Developers
In this tutorial, we set up macOS and Windows virtual machines on UTM, a macOS application that provides a GUI wrapper for QEMU, a powerful open-source emulator and virtualizer. UTM allows you to easily manage and run virtual machines without memorizing complex commands. It also has special handling for macOS, making it simpler to install compared to other virtual machine software.
What are some alternatives?
rellume - Lift machine code to performant LLVM IR
UTM - Virtual machines for iOS and macOS
cmm- - Markdown parcer
TermuxArch - Experience the pleasure of the Linux command prompt in Android, Chromebook, Fire OS and Windows on smartphone, smartTV, tablet and wearable https://termuxarch.github.io/TermuxArch/
revng-qa - Source for rev.ng test cases
Unicorn Engine - Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc, PowerPC, RiscV, S390x, TriCore, X86)
rizin - UNIX-like reverse engineering framework and command-line toolset.
Vagrant - Vagrant is a tool for building and distributing development environments.
revng-c
xemu - Original Xbox Emulator for Windows, macOS, and Linux (Active Development)
remill - Library for lifting machine code to LLVM bitcode
em-dosbox - An Emscripten port of DOSBox