/* * 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{	uchar	env[28];}; typedef jmp_buf osjmpbuf;#define	ossetjmp(buf)	setjmp(buf)