void emu_init(void *map_bottom);
void emu_call_handle_op(struct op_context *op_ctx);
void *emu_do_mmap(unsigned int length, int prot, int flags, int fd, unsigned int offset);
+int emu_do_munmap(void *addr, unsigned int length);
int emu_do_ioctl(int fd, int request, void *argp);
int emu_read_gpiodev(void *buf, int count);
void *emu_do_fopen(const char *path, const char *mode);