Auby

Open Source & JB-free mods for Geometry Dash

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📱 Install

1. Compile auby or get very very very outdated dylib from releases
2. Get 2.206 decrypted IPA
3. Inject auby and sideload IPA (the easiest way is to use sideloadly)

📋 TODO

• Rewrite in Rust
• Rewrite patcher in normal language
• Load mod with dlopen
• Geode support

❓ FAQ

How Hooks Work

gdFunc:
  mov x11, x30 ; backup original link register
  bl trampoline

trampoline:
  ldr x9, =0x2
  lsl x9, x9, #32
  ldr x10, =0x80000000
  orr x9, x9, x10
  ldr x9, [x9]
  br x9 ; jump to 0x280000000

void *findTheHook() {
  void *target;
  asm("mov %[t], x16" : [t] "=r"(target));
  // now target contains [base + offset]
}

__attribute__((naked)) void findTheHookProxy() {
  asm volatile("mov x12, x0\n" // backup args
               "mov x13, x1\n"
               "mov x14, x2\n"
               "mov x15, x3\n"
               "mov x17, x4\n"
               "sub x30, x30, 8\n"
               "mov x16, x30\n"
               "bl %[findTheHook]\n" // find the hook
               "mov x30, x11\n" // restore x30 (fix ret)
               "mov x9, x0\n" // restore args
               "mov x0, x12\n"
               "mov x1, x13\n"
               "mov x2, x14\n"
               "mov x3, x15\n"
               "mov x4, x17\n"
               "br x9\n" ::[findTheHook] "i"(findTheHook));
}

void init() {
  *((void**)0x280000000) = (void*)&findTheHookProxy;
}

📄 License

Auby is free software licensed under the GPL-3.0

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