Whispergate-JanusLoader/payload/main.cpp

#include "ecall.hpp"

// Example payload: resolve and call MessageBoxA via the VM's syscall layer.
// On Windows: a dialog box pops. On Linux test (stub syscalls): a0 returns 0.

extern "C" void janus_main() {
    void* msgbox = janus_resolve("user32.dll", "MessageBoxA");
    if (!msgbox) return;

    const char* text    = "JanusLoader: RISC-V VM shellcode running";
    const char* caption = "JanusLoader";

    uintptr_t args[4] = {
        0,                          // hWnd  = NULL
        (uintptr_t)text,
        (uintptr_t)caption,
        0,                          // MB_OK
    };
    janus_host_call(msgbox, args, 4);
}