This repo contains an example of how to create self-modifying code in C++. This works by allowing code to rewrite itself using injected x86/x64 assembly instructions.
This code is 100% cross-platform, however this repo is currently only set up for Widows + Visual Studio. I wrote about this repo here: https://medium.com/squallygame/how-we-wrote-a-self-hacking-game-in-c-d8b9f97bfa99
Feel free to submit a pull request with a CMake solution that works on Linux/OSX/Windows.
NO_OPTIMIZE
int hackableRoutineTakeDamage(int health, int damage)
{
// This is the code we want to be hackable by the user
HACKABLE_CODE_BEGIN();
health -= damage;
HACKABLE_CODE_END();
HACKABLES_STOP_SEARCH();
if (health < 0)
{
health = 0;
}
return health;
}
END_NO_OPTIMIZEWhich can be modified via:
auto funcPtr = &hackableRoutineTakeDamage;
std::vector<HackableCode*> hackables = HackableCode::create((void*&)funcPtr);
HackableCode* hackableCode = hackables[0];
// Disable taking damage by injecting a 'nop' over the original 'health -= damage;' code. Remaining bytes are filled with 'nops'
hackableCode->applyCustomCode("nop")
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