Whispergate-JanusLoader/include/janus/syscall.hpp

#pragma once
#include <cstdint>

// ECALL numbers (payload convention — a7 register)
enum JanusEcall : uint64_t {
    ECALL_GET_PEB   = 0,  // () -> void* peb
    ECALL_HOST_CALL = 1,  // (void* fn, uintptr_t* args, int argc) -> uintptr_t
    ECALL_RESOLVE   = 2,  // (char* mod, char* sym) -> void*
    ECALL_EXIT      = 3,  // (int code) -> noreturn
};

// Swap this struct to retarget the VM (different OS, sandbox environment, etc.)
struct SyscallTable {
    void*      (*get_peb)();
    uintptr_t  (*host_call)(void* fn, uintptr_t* args, int argc);
    void*      (*resolve)(const char* mod, const char* sym);
    void       (*exit_fn)(int code);
};

// Default Windows implementation (defined in src/syscall/table.cpp)
extern SyscallTable g_win_syscalls;