The long-standing industry standard for static binary analysis is IDA Pro. It features class-leading decompilation capabilities for ARM architectures but remains locked behind a restrictive commercial paywall, pushing most independent retro-gaming communities toward Ghidra. Decompiler vs. Asset Extractor
Decompiling an NDS game is rarely a single-click affair. It involves an orderly chain of unpacking, decompressing, and translating byte streams into high-level syntax.
When developers programmed games for the Nintendo DS, they primarily wrote code in C or C++. Before that code could run on the console, a compiler transformed it into binary machine code (1s and 0s) optimized for the system's dual ARM processors.
The future of NDS decompilation lies in . Recent research into neural decompilers (e.g., using transformer models to translate assembly to C) shows promise. A model trained on thousands of compiled NDS homebrew programs (where the source is available) could learn to reverse the compilation process far more effectively than static rule-based systems. Additionally, binary lifting frameworks like Remill or MCSema can lift ARM machine code into a platform-agnostic intermediate representation (LLVM IR), opening the door to powerful analysis and recompilation for modern systems.
Converting machine code into an Intermediate Representation (IR). nds decompiler
: A free, open-source reverse engineering suite developed by the NSA. It includes a powerful decompiler that can translate ARM machine code into C-like code. : A specialized Ghidra extension that allows you to load
Why go through all this effort? NDS decompilers have led to incredible breakthroughs: Native PC Ports:
"If you are reading this," the code commented in a header file, "the decompiler has worked. Don't look at the map data. It knows where you are."
Download and find a reliable open-source NDS loader plugin (available on GitHub). This plugin tells Ghidra how to interpret the memory offsets specific to the Nintendo DS hardware layout. Step 3: Import and Analyze Asset Extractor Decompiling an NDS game is rarely
for free NDS reverse engineering. Use IDA Pro + Hex-Rays only if you do NDS RE professionally.
, the open-source software reverse engineering (SRE) suite developed by the NSA, is currently the most popular choice for NDS decompilation.
Its graph view and cloud-based decompiler engines offer unmatched accuracy when mapping complex control flows and loops.
NDS developers often used hardware-specific optimizations that are invisible at the source level. For example, writing to a specific memory address (e.g., 0x04000000 for display control) triggers immediate hardware behavior. A decompiler will show a pointer dereference, but without hardware documentation (like the legendary GBATEK reference), the intent is lost. The decompiled code *(uint32*)0x4000004 = 0x1000; becomes meaningful only when you know this sets the display mode. Before that code could run on the console,
If you want to decompile an NDS ROM yourself using modern tools like Ghidra, the typical workflow follows these steps: Step 1: ROM Unpacking
The true decompiler (e.g., Ghidra’s built-in decompiler or the now-commercial Hex-Rays for IDA) attempts to lift assembly into a pseudo-C representation. For the NDS, this process is fraught with difficulty. The decompiler must identify function prologues and epilogues, reconstruct loops, infer data types, and recognize compiler idioms.
Usually runs a smaller, more standardized subsystem or BIOS-level code.