/* * system- and machine-specific declarations for emu: * floating-point save and restore, signal handling primitive, and * implementation of the current-process variable `up'. */ extern	Proc**	Xup;#define	up	(*Xup) typedef	struct	FPU	FPU; /* * This structure must agree with FPsave and FPrestore asm routines */struct FPU{	ulong	fcr31;}; typedef sigjmp_buf osjmpbuf;#define	ossetjmp(buf)	sigsetjmp(buf, 1)