/* * 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[18*8];}; /* * Later versions of Linux seemed to need large stack for gethostbyname() * so we had this at 128k, which is excessive.  More recently, we've * reduced it again after testing stack usage by gethostbyname. */#define KSTACK (16 * 1024) #ifndef USE_PTHREADSstatic __inline Proc *getup(void) {	Proc *p;	__asm__(	"mr	%0, 1" : "=r" (p));	return *(Proc **)((unsigned long)p & ~(KSTACK - 1));}#elseextern	Proc*	getup(void);#endif #define	up	(getup()) typedef sigjmp_buf osjmpbuf;#define	ossetjmp(buf)	sigsetjmp(buf, 1)