Edit Infobox 3DS Homebrews: Magikoopa 3DS

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Magikoopa is a homebrew tool aimed at rom hackers or people who want to modify the code of an existing applicaiton. Because of memory segmentation it is not easy to add as much code to code.bin files as we want. To allow that we insert a small loader into the padding between the executable and data section that reprotects memory to our needs to mark perviously read-write only memory as executable. Magikoopa compiles code for 3DS games and injects it into existing code.bin files and also patches the exheader.bin file. Furthermore it allows creating hooks from existing code into custom code. It features a nice UI that displays anything that can go wrong during the compiling and inserting steps. It even allows you to jump directly to issues in code/hooks my clicking on the issues displayed in the UI. The motivation for this is to create a NSMB2 hack with fully custom code. In theory this should work with all other games as well tho. Work in progress. Should be in a kinda working state now. ==User guide== === Getting started === * Build the project in QtCreator. * Run <code>Magikoopa</code> in the build directory. You can find examples on how to use Magikoopa in combination with NSMB2 [https://github.com/RicBent/Magikoopa-NSMB2-Examples here]. ===Hooks=== Hooks can be specified with hks files in a patch's working directory. The format is similar to YAML: hook_name_1: type: xxx link: false addr: 0x00430988 func: FunctionNameHere hook_name_2: ... There are several types of hooks. {| class="wikitable" style="width: 800px;" |- ! style="width: 10%;"|Type ! Description |- | branch || Branch to a function (overwrites the original instruction). |- | softbranch || Branch to a function (preserves the original instruction). |- | patch || Patch data at an offset. |- | symbol || Write the address of a symbol. |- |} The following parameters are common to all hook types: {|class="wikitable" style="width: 800px;" |- ! style="width: 10%;"|Parameter ! Description |- | addr || Hook address. |- |} ===Branch hooks=== {|class="wikitable" style="width: 800px;" |- ! style="width: 10%;"|Parameter ! Description |- | link | <code>true</code> to make a BL instruction, <code>false</code> for B. |- | func | (1) Branch destination function name. This will be converted to an address using the symbol table. |- | dest | (2) Branch destination address. |- |} Link and one of func and dest are required parameters. ===Soft-branch hooks=== {|class="wikitable" style="width: 800px;" |- ! style="width: 10%;"|Parameter ! Description |- | func | (1) Branch destination function name. This will be converted to an address using the symbol table. |- | dest | (2) Branch destination address. |- | opcode | "pre" (branch to func/dest after the original instruction), "post" (branch before the original instruction) or "ignore" (default). |- |} One of func and dest are required parameters. ===Patch hooks=== {|class="wikitable" style="width: 800px;" |- ! style="width: 10%;"|Parameter ! Description |- | data | (1) Data to insert (in hexadecimal). |- | src | (2) Symbol name of data to insert. |- | len | (2) Length of data to insert. |- |} data, or both src and len, are required parameters. ==Screenshots== https://dlhb.gamebrew.org/3dshomebrews/magikoopa3.png ==Credits== Thanks to: * Dirbaio - Creator of the NSMBDS asm patch template which was used as a basis. * StapleButter - Partial coding of the Filesystem classes. * Icons8 - Icons ([https://icons8.com https://icons8.com]). ==External links== * GitHub (Magikoopa) - https://github.com/RicBent/Magikoopa * GitHub (Magikoopa-Examples) - https://github.com/RicBent/Magikoopa-NSMB2-Examples * Reddit - https://www.reddit.com/r/3dshacks/comments/78bokx/magikoopa_code_patcher_for_3ds_games * Kuribo64 - http://kuribo64.net/board/thread.php?id=3423