1 #include "ucontext.c"
2 
3 #ifdef OLD
4 
5 #include "threadimpl.h"
6 /*
7  * To use this you need some patches to Valgrind that
8  * let it help out with detecting stack overflow. 
9  */
10 #ifdef USEVALGRIND
11 #include <valgrind/memcheck.h>
12 #endif
13 
14 static void
15 launcher386(void (*f)(void *arg), void *arg)
16 {
17 	Proc *p;
18 	Thread *t;
19 
20 	p = _threadgetproc();
21 	t = p->thread;
22 	_threadstacklimit(t->stk, t->stk+t->stksize);
23 
24 	(*f)(arg);
25 	threadexits(nil);
26 }
27 
28 void
29 _threadinitstack(Thread *t, void (*f)(void*), void *arg)
30 {
31 	ulong *tos;
32 
33 	tos = (ulong*)&t->stk[t->stksize&~7];
34 	*--tos = (ulong)arg;
35 	*--tos = (ulong)f;
36 	t->sched.pc = (ulong)launcher386;
37 	t->sched.sp = (ulong)tos - 8;		/* old PC and new PC */
38 }
39 
40 void
41 _threadinswitch(int enter)
42 {
43 	USED(enter);
44 #ifdef USEVALGRIND
45 	if(enter)
46 		VALGRIND_SET_STACK_LIMIT(0, 0, 0);
47 	else
48 		VALGRIND_SET_STACK_LIMIT(0, 0, 1);
49 #endif
50 }
51 
52 void
53 _threadstacklimit(void *bottom, void *top)
54 {
55 	USED(bottom);
56 	USED(top);
57 
58 #ifdef USEVALGRIND
59 	VALGRIND_SET_STACK_LIMIT(1, bottom, top);
60 #endif
61 }
62 #endif