// Figure out whether to use %fs or %gs as the vx32 control segment.// The host operating system is likely to use one of them as the // thread-local storage segment.  Use the other one. #if defined(__APPLE__)#	define EXT(s) _ ## s#	define VSEG_FS#elif defined(__FreeBSD__)#	define VSEG_FS#elif defined(__linux__)#	if defined(__i386__)#		define VSEG_FS#	else /* x86-64 */#		define VSEG_GS#	endif#else#error	Unsupported operating system.#endif #ifdef VSEG_FS#	define VSEG %fs#	define VSEGSTR "%fs"#	define VSEGPREFIX 0x64#	define mc_vs mc_fs#	define ss_vs ss.fs#else#	define VSEG  %gs#	define VSEGSTR  "%gs"#	define VSEGPREFIX 0x65#	define mc_vs mc_gs#	define ss_vs ss.gs#endif #ifndef EXT#	define EXT(s) s#endif