- Crosscompile using CMake
After debunking crosscompiling beeing hard in an earlier post, i want demonstrate how it can be used to build CMake projects for foreign architectures. To get started we need the same basic setup as in the previous crosscompilation post. Let’s assume the target environment has been installed into ${HOME}/crosscompile/bookworm-arm64. The project we are going to compile is the CMake version of Lua from github: walterschell/Lua. The magic sauce to make CMake compile to foreign architectures effortlessly are toolchain files.Published: Tags: clang llvm cmake - Ieads Definitive Guide to LLVM Backends (I)
Published: Tags: llvm C++ VM When writing my first llvm backend at my last job I quickly found out that there is only very material assisting the creation of a custom backend. The posts and tutorials only cover the basics and stop as soon as it starts to become really interesting. This series of posts serves to fill the void left by others and to teach how to customice and tailor different aspects of a backend to your needs.
- Solving VM based checker with Klee
Published: Tags: ctf rev python llvm se To solve the “just the check please” task from PPP-CTF in 2023 I went the unusual path of lifting the virtual machine code used as obfuscation to LLVM-IR. That way I was able to utilize the advanced symbolic execution engine “Klee” to solve for the winning input.
- Crosscompile
Published: Tags: clang llvm Cross compiling for different architectures and linux distributions is actually not half as hard as it is made out to be. I know many that regard cross compilation as too difficult and error prone to be even considered and thus always require an entire setup for the target architecture. But handling virtual machines can be cumbersome and juggling real hardware even more. Worry not tho, i will teach you an easy yet versitile way to achieve cross compilation