/* * 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];}; #define KSTACK (32 * 1024) #ifndef USE_PTHREADSstatic __inline Proc *getup(void) {	Proc *p;	__asm__(	"movl	%%esp, %%eax\n\t"			: "=a" (p)	);	return *(Proc **)((uintptr)p & ~(KSTACK - 1));}#elseextern	Proc*	getup(void);#endif #define	up	(getup()) typedef sigjmp_buf osjmpbuf;#define	ossetjmp(buf)	sigsetjmp(buf, 1)