1 #include "threadimpl.h"
2 
3 static void
4 launchersparc(uint o0, uint o1, uint o2, uint o3,
5 	uint o4, uint o5, uint o6, uint o7,
6 	void (*f)(void *arg), void *arg)
7 {
8 	if(0) print("ls %x %x %x %x %x %x %x %x %x %x at %x\n",
9 		o0, o1, o2, o3, o4, o5, o6, o7, f, arg, &o0);
10 	(*f)(arg);
11 	threadexits(nil);
12 }
13 
14 void
15 _threadinitstack(Thread *t, void (*f)(void*), void *arg)
16 {
17 	ulong *tos, *stk;
18 
19 	/*
20 	 * This is a bit more complicated than it should be,
21 	 * because we need to set things up so that gotolabel
22 	 * (which executes a return) gets us into launchersparc.
23 	 * So all the registers are going to be renamed before
24 	 * we get there.  The input registers here become the
25 	 * output registers there, which is useless.  
26 	 * The input registers there are inaccessible, so we
27 	 * have to give launchersparc enough arguments that
28 	 * everything ends up in the stack.
29 	 */
30 	tos = (ulong*)&t->stk[t->stksize&~7];
31 	stk = tos;
32 	--stk;
33 	*--stk = (ulong)arg;
34 	*--stk = (ulong)f;
35 	stk -= 25;	/* would love to understand this */
36 	t->sched.link = (ulong)launchersparc - 8;
37 	t->sched.input[6] = 0;
38 	t->sched.sp = (ulong)stk;
39 	if(0) print("tis %x %x at %x\n", f, arg, t->sched.sp);
40 }
41