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Disassembly of Golden Sun
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README.md

Golden Sun

This is a disassembly of Golden Sun.

It builds the following ROM:

Status

  • All known code has been disassembled and symbolized.
  • Data has not been disassembled yet.
  • Overlays (map code) are not yet built into the output ROM, due to lacking a matching compressor. The build system builds and verifies uncompressed overlays.
  • Editing is not meaningfully possible yet. Data included verbatim from the base ROM contains many absolute addresses, so changing the position of any symbol is likely to produce a broken ROM.

Roadmap

More like a list of goals. Not in any particular order.

  • Develop a matching compressor and build overlays into the output ROM.
  • Declare variables in source files and get rid of wram.sym.
  • Isolate modules further. Modules should be partially linked and combined in a final link. Functions and data should not be visible, only exported entry points.
  • Document code.
  • Disassemble and document data.
  • Develop a matching C compiler and decompile C instead of disassembling.

Prerequisites

The original ROM (USA version) is required. It must be named baserom.gba and placed in the root directory of the repository.

Required software:

  • GNU make
  • GNU binutils targeting ARM/Thumb (arm-none-eabi)
  • C compiler such as GCC or Clang, targeting host architecture (not ARM/Thumb)

To install these dependencies on Debian or Ubuntu:

apt install make gcc binutils-arm-none-eabi

Build

make

The default target builds and verifies the ROM and all overlays.

To build only the ROM:

make goldensun.bin

To verify the ROM:

make compare-goldensun

To build a single overlay, for example overlays/rom_779188/overlay.bin:

make overlays/rom_779188/overlay.bin

To verify a single overlay, for example overlays/rom_779188/overlay.bin:

make compare-overlays/rom_779188/overlay

To delete all output files produced by the build:

make clean

Acknowledgements

Golden Sun is copyright 2001 Nintendo / Camelot Software Planning.

This is a fan project, not associated in any way with Nintendo or Camelot.