+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_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);
+int emu_do_system(const char *command);
+int emu_do_execve(const char *filename, char *const argv[], char *const envp[]);
+
+int host_init(void);
+int host_read_btns(void);
+void host_forced_exit(void);
+
+enum { GP2X_UP = 0, GP2X_LEFT = 2, GP2X_DOWN = 4, GP2X_RIGHT = 6,
+ GP2X_START = 8, GP2X_SELECT = 9, GP2X_L = 10, GP2X_R = 11,
+ GP2X_A = 12, GP2X_B = 13, GP2X_X = 14, GP2X_Y = 15,
+ GP2X_VOL_UP = 16, GP2X_VOL_DOWN = 17, GP2X_PUSH = 18 };