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README.md

llama

the Low Level ARM Machine Amulator (of course)


What is llama?

Llama is an experimental emulator for the Nintendo 3DS's ARM9 (with a very limited ARM11 implementation as well).

Llama most certainly cannot run any 3DS games. Don't even try.

What does it look like?

See for yourself!

Llama's GUI, running Hourglass9

Source-level debugging in a GDB TUI? That's a lot of buzzwords!

How do I use it?

First, you have to build llama from source. See below.

Loading applications

Llama loads binaries from either a FIRM file or a "ctr9" package.

A ctr9 package is a directory named [dirname].ctr9, with the following structure:

foo.ctr9:
|- desc.json
|- ...

"desc.json"

The desc.json file describes how llama will load your ARM9 binaries. desc.json files look like this:

{
    "entryPoint": "0x0801B01C",
    "entryPoint11": "0x1FFAD034"
    "binFiles": [
        { "bin": "firm_0_1FF00000.bin", "vAddr": "0x1FF00000" },
        { "bin": "firm_1_1FF80000.bin", "vAddr": "0x1FF80000" },
        { "bin": "firm_2_08006800.bin", "vAddr": "0x08006800" }
    ],
}
  • entryPoint: Address at which llama will begin executing the ARM9 processor.
  • entryPoint11: Address at which llama will begin executing the ARM11 processor.
  • binFiles, binFiles11: Array of binaries found within the ctr9 package.
    • bin: The binary filename.
    • vAddr: Address where llama will copy the binary.

Debugger

Llama will not automatically begin running the ctr9 package upon opening. To run, press the play/pause button or use the run debugger command.

Llama has a semi-useful built-in debugger controlled with textual commands.

  • run: Unpauses the loaded program.
  • cpu <arm9|arm11>: Switches between actively debugged CPUs
  • asm [address hex]: Prints disassembly for the current instruction.
  • brk <address hex>: Adds a CPU breakpoint at the specified address.
  • btn [button] [up/down]: Toggles a button or prints full button state.
  • irq <type>: Triggers an interrupt request of the specified type.
  • keydmp: Dump AES keys.
  • mem <start address hex> [# bytes hex] [dumpfile.bin]: Prints n bytes of memory from the specified address, optionally dumping to file.
  • reg [register name]: Prints specified register, or all registers if none specified.
  • step: Runs one CPU instruction.

What can I use it with?

My crossbar9 repository can be used as a template for Rust programs that should run on both llama and the actual 3DS.

How do I build it?

Llama is written in Rust and C++, which means you need a compiler for both languages installed on your system.

The GUI uses Qt5, which must be installed as well. Make sure you also have QtQuick/Qt-declarative.

Miscellaneous dependencies:

  • Capstone disassembler

Actually building

Once all dependencies are installed, building should be as easy as running:

cargo build --release

License

Llama is licensed under the BSD 3-clause license.

Included icons were created by material.io and are licensed under Apache v2.0.

About

Low Level ARM Machine Amulator - but really, a low-level emulator for the Nintendo 3DS. Main focus on its ARM9 security processor.

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