/* * system- and machine-specific declarations for emu: * floating-point save and restore, signal handling primitive, and * implementation of the current-process variable `up'. */ /* * This structure must agree with FPsave and FPrestore asm routines */typedef struct FPU FPU;struct FPU{	uchar	env[28];};  #ifndef USE_PTHREADS#define KSTACK (16 * 1024)	/* must be power of two */static __inline Proc *getup(void) {	Proc *p;	__asm__(	"mov	%0, %%sp;" 			: "=r" (p)  	); 	return *(Proc **)((uintptr)p & ~(KSTACK - 1));}#else#define KSTACK (32 * 1024)	/* need not be power of two */extern	Proc*	getup(void);#endif #define	up	(getup()) typedef sigjmp_buf osjmpbuf;#define	ossetjmp(buf)	sigsetjmp(buf, 1)