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README.md

pokerubydiff

Requirements

  • Python 3.6
  • Node.js and NPM (for building static assets)
  • Clang

Installation

Clone the repo and build the web client:

First, install the dependencies - yarn (recommended) or npm is required.

yarn install

or

npm install

After this has completed, package the static assets:

npm run build

Now you can install the Python server:

python setup.py install

Usage

Navigate to your pokeruby directory. Perform a clean, matching build and ensure that both the ELF and the GBA files have been created.

Rename the pokeruby.elf and pokeruby.gba files to basepokeruby.elf and basepokeruby.gba respectively. The ELF file is used to get debugging information such as symbol names for a better ASM output.

After doing this, you can then just start the diff client to watch your src/, asm/ and include/ files for changes:

pokerubydiff

Navigate to the URL logged to the console and make a change.

The diff client will use clang to parse any C files you edit in order to find the symbol name of the function you last edited. It will log to the console if it was unable to find a changed function, or use the last function. If this is not working, you can specify an initial function to diff using

pokerubydiff --function NameOfTheFunction

Notes

The disassembler is a custom disassembler based on the Capstone engine. It is incredibly basic, and makes many assumptions (e.g. that the stack will be aligned) in order to find the return location of a function and to identify data and alignment regions. At present, it can only handle THUMB and it is not equipped to handle many branch types, such as mov pc, rX or long jumps via bx rX. This means it will be unable to handle jump tables for now.

About

A web-based diff client to assist with decompiling pokeruby

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