#include <u.h>#include <libc.h>#include <thread.h>#include "threadimpl.h" /* first argument goes in a register and on the stack; avoid it */static voidlauncheralpha(int, void (*f)(void *arg), void *arg){	(*f)(arg);	threadexits(nil);} void_threadinitstack(Thread *t, void (*f)(void*), void *arg){	ulong *tos; 	tos = (ulong*)&t->stk[t->stksize&~7]; 	*--tos = 0;		/* pad arguments to 8 bytes */	*--tos = (ulong)arg;	*--tos = (ulong)f;	*--tos = 0;		/* first arg */ 	*--tos = 0;		/* for alignment with... */	*--tos = 0;		/* ... place to store return PC */ 	t->sched[JMPBUFPC] = (ulong)launcheralpha+JMPBUFDPC;	t->sched[JMPBUFSP] = (ulong)tos;}