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CONTRIBUTE.md

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The process

  1. Reverse, Document, and Disassemble code into .s files, and data into binary formats.
  2. Include the .s file into _link.s
  3. If the file is to be included to a specified section (continuing from the last end address), or a new range:
  • If it belongs to a new range, create a section for that range according to the format .r__firstFile. (Ex: the first range is .r__start since start.s is the first file in that section.)
  • Set the section flag to "ax" to ensure it's loaded. (Eg: .section .r__start, "ax")
  • include the range, and its start address into ld_script.x
  • Set the section of the file: .section .filename, "ax"
  1. there may be external symbols declared within. Those are symbols that are used, but not declared anywhere in the file. For that, create a filename.inc file inside the externs directory to specify all external symbols for each file.
  • .equ define each symbol as such: .equ symbolname, symbol_val
  • Include the external inc file to the start of _link.s.
  1. If using IDA, https://github.com/LanHikari22/GBA-IDA-Pseudo-Terminal contains tools that speed up this process by generating the disassembly and external symbols automatically.
  2. make rom; Build the rom and make sure it's successful
  3. make checksum; Make sure that the output ROM has an identical checksum to the input binary.
  4. if (!complete) goto 1; // good luck!