2001-03-16 21:07:22 +00:00
|
|
|
/* Copyright (C) 2001 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
2001-07-06 04:58:11 +00:00
|
|
|
modify it under the terms of the GNU Lesser General Public
|
|
|
|
License as published by the Free Software Foundation; either
|
|
|
|
version 2.1 of the License, or (at your option) any later version.
|
2001-03-16 21:07:22 +00:00
|
|
|
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
2001-07-06 04:58:11 +00:00
|
|
|
Lesser General Public License for more details.
|
2001-03-16 21:07:22 +00:00
|
|
|
|
2001-07-06 04:58:11 +00:00
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
|
|
License along with the GNU C Library; if not, write to the Free
|
|
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
|
|
02111-1307 USA. */
|
2001-03-16 21:07:22 +00:00
|
|
|
|
|
|
|
#include <errno.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <ucontext.h>
|
|
|
|
|
|
|
|
static ucontext_t ctx[3];
|
|
|
|
|
|
|
|
static int was_in_f1;
|
|
|
|
static int was_in_f2;
|
|
|
|
|
2001-04-06 21:58:34 +00:00
|
|
|
static char st2[8192];
|
|
|
|
|
2001-03-16 21:07:22 +00:00
|
|
|
static void
|
|
|
|
f1 (long a0, long a1, long a2, long a3)
|
|
|
|
{
|
|
|
|
printf ("start f1(a0=%lx,a1=%lx,a2=%lx,a3=%lx)\n", a0, a1, a2, a3);
|
|
|
|
|
|
|
|
if (a0 != 1 || a1 != 2 || a2 != 3 || a3 != -4)
|
|
|
|
{
|
|
|
|
puts ("arg mismatch");
|
|
|
|
exit (-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (swapcontext (&ctx[1], &ctx[2]) != 0)
|
|
|
|
{
|
|
|
|
printf ("%s: swapcontext: %m\n", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
puts ("finish f1");
|
|
|
|
was_in_f1 = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
f2 (void)
|
|
|
|
{
|
2001-04-06 21:58:34 +00:00
|
|
|
char on_stack[1];
|
|
|
|
|
2001-03-16 21:07:22 +00:00
|
|
|
puts ("start f2");
|
2001-04-06 21:58:34 +00:00
|
|
|
|
|
|
|
printf ("&on_stack=%p\n", on_stack);
|
|
|
|
if (on_stack < st2 || on_stack >= st2 + sizeof (st2))
|
|
|
|
{
|
|
|
|
printf ("%s: memory stack is not where it belongs!", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
|
2001-03-16 21:07:22 +00:00
|
|
|
if (swapcontext (&ctx[2], &ctx[1]) != 0)
|
|
|
|
{
|
|
|
|
printf ("%s: swapcontext: %m\n", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
puts ("finish f2");
|
|
|
|
was_in_f2 = 1;
|
|
|
|
}
|
|
|
|
|
2001-04-07 20:39:34 +00:00
|
|
|
volatile int global;
|
|
|
|
|
2001-03-16 21:07:22 +00:00
|
|
|
int
|
|
|
|
main (void)
|
|
|
|
{
|
|
|
|
char st1[8192];
|
|
|
|
|
|
|
|
puts ("making contexts");
|
|
|
|
if (getcontext (&ctx[1]) != 0)
|
|
|
|
{
|
|
|
|
if (errno == ENOSYS)
|
|
|
|
exit (0);
|
|
|
|
|
|
|
|
printf ("%s: getcontext: %m\n", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
2001-04-07 20:39:34 +00:00
|
|
|
|
|
|
|
/* Play some tricks with this context. */
|
|
|
|
if (++global == 1)
|
|
|
|
if (setcontext (&ctx[1]) != 0)
|
|
|
|
{
|
|
|
|
printf ("%s: setcontext: %m\n", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
if (global != 2)
|
|
|
|
{
|
|
|
|
printf ("%s: 'global' not incremented twice\n", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
|
2001-03-16 21:07:22 +00:00
|
|
|
ctx[1].uc_stack.ss_sp = st1;
|
|
|
|
ctx[1].uc_stack.ss_size = sizeof st1;
|
|
|
|
ctx[1].uc_link = &ctx[0];
|
|
|
|
makecontext (&ctx[1], (void (*) (void)) f1, 4, 1, 2, 3, -4);
|
|
|
|
|
|
|
|
if (getcontext (&ctx[2]) != 0)
|
|
|
|
{
|
|
|
|
printf ("%s: second getcontext: %m\n", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
ctx[2].uc_stack.ss_sp = st2;
|
|
|
|
ctx[2].uc_stack.ss_size = sizeof st2;
|
|
|
|
ctx[2].uc_link = &ctx[1];
|
|
|
|
makecontext (&ctx[2], f2, 0);
|
|
|
|
|
|
|
|
puts ("swapping contexts");
|
|
|
|
if (swapcontext (&ctx[0], &ctx[2]) != 0)
|
|
|
|
{
|
|
|
|
printf ("%s: swapcontext: %m\n", __FUNCTION__);
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
puts ("back at main program");
|
|
|
|
|
|
|
|
if (was_in_f1 == 0)
|
|
|
|
{
|
|
|
|
puts ("didn't reach f1");
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
if (was_in_f2 == 0)
|
|
|
|
{
|
|
|
|
puts ("didn't reach f2");
|
|
|
|
exit (1);
|
|
|
|
}
|
|
|
|
|
|
|
|
puts ("test succeeded");
|
|
|
|
return 0;
|
|
|
|
}
|