Custom Firmware Luma3DS 8.0

5 juin 2017 Badablek

AuroraWright met à jour son excellent Custom Firmware « Luma3DS », en y ajoutant de nouvelles fonctionnalités très intéressantes. On pourra notamment profiter de Rosalina, un module système maison qui offre des options inédites :

un menu accessible à n’importe quel moment en appuyant sur L+Bas+Select, qui permet (entre autre) de régler la fréquence d’horloge ou bien encore de faire une capture d’écran
un système de redirection des touches, pour contrôler votre console depuis un PC
un lanceur de fichiers .3DSX (homebrews) sans payloads, qui simplifiera la vie des utilisateurs
un debuggueur plus poussé, qui servira très certainement aux développeurs de homebrews

Nouveautés / Corrections :

This major release introduces Rosalina, Luma3DS’s custom system module, the functionalities of which are described below.

You’ll need to upgrade to boot9strap v1.2 or higher.

A menu which can be opened at any time (combo: L+Down+Select, although you can change it at runtime), featuring:

A process list submenu (used to select process to attach when the debugger is enabled)

A processes patch submenu: patches FS and SM

A N3DS Clock+L2 submenu (hidden on O3DS)

A screenshot action. This is slow but it works

Other various options, see below

A display of the remaining battery percentage in the bottom right of the screen, and of the Luma3DS commit at the bottom left

Input redirection:

Implementation thanks to @Stary2001, based off the work of ShinyQuagsire

Allows you to control your 3DS using your PC with, for example, an external controller (Xbox360 controller, etc.)

Should work with every game with minimal lag

C-stick/ZL/ZR redirection is N3DS-only, possibly only with newer games

Use this client (compatible with xinput on Windows, evdev on Linux, should be compatible with OSX) or that one

If you activate this feature in Home Menu, applications will be prevented to disconnect the 3DS from the Internet while they’re running. This takes effect until the next boot

3DSX loading:

Thanks to @fincs

3DSX files can now be loaded seamlessly, and work just like installed titles (meaning you can use the Home Menu and applets while a 3DSX application is running, use the GDB stub (see below), etc.)!

No need for *hax payloads anymore!

By default, the title used to boot boot.3dsx is hblauncher_loader, but this can be changed at any time (Miscellaneous options > Switch the hb. title to the current app.) : simply launch any title, use that option, close the title ; the next time you launch that title, it will run boot.3dsx

*hax payloads don’t work anymore. You’ll have to use version of the Homebrew Menu >= 2.0, which can be found here (and in the homebrew starter pack later on)

Better language emulation:

Language (and region) emulation should now work for all games

You can now specify a country (2 letter code) and a state ID (2-digit hex integer), for example: EUR FR FR 01

A fully-featured GDB stub:

Network code and skeleton thanks to @Stary2001

Can debug up to 3 processes simultaneously (the process to attach to are to be selected in the process list menu)

Use the process menu when the debugger is enabled to select processes to attach to.

Use -lctrud and -lcitro3dd instead of -lctru and -lcitro3d, -Og instead of -O2, drop -fomit-frame-pointer build debug versions of your own applications.

Compatible with both GDB and IDA PRO:

The GDB stub requires a patch to work. This patch will get eventually integrated into devkitARM.

Use this patch applied on GDB 7.11 then build using ./configure --prefix=<where you want> --target=arm-none-eabi --disable-werror --with-python --without-guile --with-ncurses --with-expat, or use this Windows 64-bit build of patched GDB 7.12.

The GDB stubs also works with IDA (Use single-step support, in the specific debugger options prompt, should be unchecked).

Software breakpoints, 2 hardware watchpoints (globally), all basic features and many more, like catch syscall, info os, etc.

Can access the 80000000..B0000000 strongly ordered mapping (see below) as well as privileged memory

If you activate this feature in Home Menu, applications will be prevented to disconnect the 3DS from the Internet while they’re running. This takes effect until the next boot

Now for some developer/technical details:

A « kernel extension » extending the features of Kernel11 ( ͡° ͜ʖ ͡°):

New features for existing SVCs, for example:

New types for svcGetProcessInfo: 0x10000 to get a process’s name, 0x10001 to get a process’s title ID, 0x10002 to 0x10007 for section attributes, 0x10008 for TTBR1, etc.

New types for svcGetSystemInfo: 0x10000 for CFW info, 0x10001 for N3DS-related info, 0x10002 for TTBCR and TTBR0 per core, etc.

New types for svcGetThreadInfo: 0x10000 for thread local storage

Many other changes not listed here

New SVCs:

See csvc.h ( ͡° ͜ʖ ͡°)

Indirect SVC: svc 0xFE

Debug features:

SVC permission checks don’t exist anymore

Everything behaves as if the « Allow debug » kernel flags was always set, and svcKernelSetState as well as the official debug handlers always believe that the unit is a development one. This is needed for the below item

No need to do svcKernelSetState(6, 1, 1LL) for user-specified exception handlers anymore.

Numerous fixes of Luma3DS’s fatal exception handlers. Moreover, they are now only used either on privileged-mode crashes or when there is no preferred alternative, that are namely: KDebug based-debugging, or user-defined exception handlers.

New memory mapping: PA 00000000..30000000 -> VA 80000000..B0000000 [ Priv: RWX, User: RWX ] [ Shared, Strongly Ordered ] (accessible from the GDB stub)

Because of memory issues, ErrDisp is not launched; err:f has been reimplemented.

Minor issues: the menu can sometime freeze in some games (that will be attempted to be fixed before next release), versions < 9.0 haven’t been tested.

Luma is now a proper FIRM with separate arm11, arm9 and modules sections

Switched to a whitelist for FIRM loading

It’s now possible to boot newer DS flashcarts (the ones appearing in the original DS’ main menu) and early DSi flashcarts directly from Home Menu

Luma now works with NANDs using custom NCSDs/MBRs

« Enable exception handlers » was removed, since it’s always on with Rosalina choosing the best exception reporting method depending on the context

Luma can now boot on its own as FIRM0/1 (although note this is not recommended or supported at all and we very strongly recommend using boot9strap)

Comme vous pouvez le voir, le changelog de cette nouvelle version est long comme le bras et propose de bien belles choses, aussi bien pour les utilisateurs lambda que les développeurs en herbe. Des efforts ont été consentis pour améliorer l’expérience, et peut-être également tenter d’éviter le ban hammer de Nintendo avec la possibilité de lancer des contenus exotiques sans que cela soit trop voyant.

Attention : cette version de Luma3DS nécessite au minimum la version 1.2 de boot9strap.

Luma3DS 8.0