1 76193d7c 2003-09-30 devnull #include "threadimpl.h"
 2 a3785ca2 2004-04-21 devnull /*
 3 a3785ca2 2004-04-21 devnull  * To use this you need some patches to Valgrind that
 4 a3785ca2 2004-04-21 devnull  * let it help out with detecting stack overflow. 
 5 a3785ca2 2004-04-21 devnull  */
 6 a3785ca2 2004-04-21 devnull #ifdef USEVALGRIND
 7 a3785ca2 2004-04-21 devnull #include <valgrind/memcheck.h>
 8 a3785ca2 2004-04-21 devnull #endif
 9 76193d7c 2003-09-30 devnull 
10 76193d7c 2003-09-30 devnull static void
11 76193d7c 2003-09-30 devnull launcher386(void (*f)(void *arg), void *arg)
12 76193d7c 2003-09-30 devnull {
13 a3785ca2 2004-04-21 devnull 	Proc *p;
14 a3785ca2 2004-04-21 devnull 	Thread *t;
15 a3785ca2 2004-04-21 devnull 
16 a3785ca2 2004-04-21 devnull 	p = _threadgetproc();
17 a3785ca2 2004-04-21 devnull 	t = p->thread;
18 a3785ca2 2004-04-21 devnull 	_threadstacklimit(t->stk);
19 a3785ca2 2004-04-21 devnull 
20 76193d7c 2003-09-30 devnull 	(*f)(arg);
21 76193d7c 2003-09-30 devnull 	threadexits(nil);
22 76193d7c 2003-09-30 devnull }
23 76193d7c 2003-09-30 devnull 
24 76193d7c 2003-09-30 devnull void
25 76193d7c 2003-09-30 devnull _threadinitstack(Thread *t, void (*f)(void*), void *arg)
26 76193d7c 2003-09-30 devnull {
27 76193d7c 2003-09-30 devnull 	ulong *tos;
28 76193d7c 2003-09-30 devnull 
29 76193d7c 2003-09-30 devnull 	tos = (ulong*)&t->stk[t->stksize&~7];
30 76193d7c 2003-09-30 devnull 	*--tos = (ulong)arg;
31 76193d7c 2003-09-30 devnull 	*--tos = (ulong)f;
32 76193d7c 2003-09-30 devnull 	t->sched.pc = (ulong)launcher386;
33 76193d7c 2003-09-30 devnull 	t->sched.sp = (ulong)tos - 8;		/* old PC and new PC */
34 76193d7c 2003-09-30 devnull }
35 76193d7c 2003-09-30 devnull 
36 a3785ca2 2004-04-21 devnull void
37 a3785ca2 2004-04-21 devnull _threadinswitch(int enter)
38 a3785ca2 2004-04-21 devnull {
39 a3785ca2 2004-04-21 devnull 	USED(enter);
40 a3785ca2 2004-04-21 devnull #ifdef USEVALGRIND
41 a3785ca2 2004-04-21 devnull 	if(enter)
42 a3785ca2 2004-04-21 devnull 		VALGRIND_SET_STACK_LIMIT(0, 0, 1);
43 a3785ca2 2004-04-21 devnull 	else
44 a3785ca2 2004-04-21 devnull 		VALGRIND_SET_STACK_LIMIT(0, 0, 0);
45 a3785ca2 2004-04-21 devnull #endif
46 a3785ca2 2004-04-21 devnull }
47 a3785ca2 2004-04-21 devnull 
48 a3785ca2 2004-04-21 devnull void
49 a3785ca2 2004-04-21 devnull _threadstacklimit(void *addr)
50 a3785ca2 2004-04-21 devnull {
51 a3785ca2 2004-04-21 devnull 	USED(addr);
52 a3785ca2 2004-04-21 devnull 
53 a3785ca2 2004-04-21 devnull #ifdef USEVALGRIND
54 a3785ca2 2004-04-21 devnull 	VALGRIND_SET_STACK_LIMIT(1, addr, 0);
55 a3785ca2 2004-04-21 devnull #endif
56 a3785ca2 2004-04-21 devnull }