Decades of legacy NDS hacking scripts exist for IDA Pro, making it incredibly powerful if you can afford the commercial license or utilize the limited architecture support in IDA Free. Cost: Commercial (Paid) / Limited Free Version. 3. Decompilation Projects (C++ Reconstruction)
It's crucial to understand that no tool will magically convert a ROM into editable C code. Even advanced decompilers like Hex-Rays generate —a best‑guess representation of the original logic, stripped of original variable names, comments, and structure. The output is functional but rarely pretty.
Emulators like (with Lua scripting) or MelonDS allow you to log every executed instruction. Combine this with a disassembler. Some developers write custom Python scripts to trace functions and generate C stubs – a primitive, game-specific decompiler.
"There are some fairly advanced decompilers these days," notes one community expert, but "I have not seen anybody do anything like this for the DS and don't expect much to come from such efforts—for most things it is likely easier to approach it from the assembly side of things and work backwards". nds decompiler
A .nds file contains:
Word count: ~1,650
Ghidra features a highly advanced, built-in C decompiler that translates ARM assembly into remarkably clean C pseudo-code. Decades of legacy NDS hacking scripts exist for
A decompiler attempts to go further: from assembly back to a high-level language like C. This is an —information about variable names, original loop structures, and comments is irretrievably lost during compilation. Modern decompilers use heuristics, pattern matching, and data-flow analysis to produce approximate C code.
Decompilation is rarely a "one-click" process. Several hurdles remain: Inline Functions:
An NDS decompiler must handle two separate executable binaries inside a single .nds file: arm9.bin and arm7.bin . Because these chips constantly pass data back and forth through shared memory spaces, reverse engineers must reconstruct both tracks of code to understand how a single event triggers in-game. Modern NDS Decompilation Pipeline Emulators like (with Lua scripting) or MelonDS allow
Best practices
To understand decompilation, it helps to look at the reverse-engineering spectrum: