The Homebrew scene is the ethical safe harbor: decompile your own NDS programs to study compilation, or decompile open-source DS demos.
By automating the transition from binary to source, an NDS decompiler serves as an essential tool for digital archeology. Future work involves integrating machine learning to improve variable naming and "symbolication" based on known open-source SDKs.
Do you have a in mind that you want to analyze?
Decodes the 32-bit ARM and 16-bit Thumb instruction sets used by the system. nds decompiler
If you need to "decompile" the physical device (disassembly), you will need specific precision tools for the proprietary screws: Tri-Wing Precision Screwdriver
| Challenge | Description | |-----------|-------------| | | Decompilers often misalign control flow at mode switches | | Inlined assembly | SDK macros use inline asm for speed; decompiler produces gibberish | | Overlays | Code loaded at runtime into same address space – static analysis misses cross-overlay calls | | Custom memory maps | NDS has 8+ distinct memory regions (Main RAM, VRAM, Shared WRAM, etc.) – pointers ambiguous | | Register banking | ARM9 has banked registers for IRQ/Supervisor modes – decompiler sees only user mode | | Binary differencing | Matching decompiled code to known SDK versions requires signature scanning |
Highly scriptable with Python and more affordable than IDA Pro. The Step-by-Step NDS Decompilation Workflow The Homebrew scene is the ethical safe harbor:
Users can write scripts to automate repetitive tasks, like renaming known SDK functions. 2. IDA Pro / IDA Free
Understanding how to use an NDS decompiler generally leads to two distinct paths in the gaming community:
IDA Pro is an industry-standard interactive disassembler and decompiler. While the full version with the Hex-Rays ARM decompiler is expensive, it offers unmatched analysis accuracy and speed. IDA Free provides basic ARM disassembly, but lacks the advanced high-level C decompilation found in Ghidra or paid IDA tiers. 3. PokeFinder / Specialized Decompilation Projects Do you have a in mind that you want to analyze
: A utility that initializes a decompilation project by taking an input ROM and organizing its contents for further study. ROM Analysis & Utility Tools
Run the following command in your terminal to unpack the ROM: ndstool -x game.nds -9 arm9.bin -7 arm7.bin -y overlays
If you are interested in trying this out, I can help you find where to download Ghidra, or perhaps you'd like me to explain how to set up a specific plugin? Top 10 hardware reverse engineering tools for 2026
Radare2 is a command-line reverse engineering framework, and is its graphical user interface.
: A collaborative web-based tool where you can input assembly code from a DS game and attempt to write C code that compiles to a matching binary.