131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/* Check setcontext on the context from makecontext.
|
|
Copyright (C) 2018-2022 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
|
|
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.
|
|
|
|
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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <ucontext.h>
|
|
#include <unistd.h>
|
|
#include <stdatomic.h>
|
|
|
|
static ucontext_t ctx[5];
|
|
static atomic_int done;
|
|
|
|
static void
|
|
__attribute__((noinline, noclone))
|
|
f2 (void)
|
|
{
|
|
done++;
|
|
puts ("swap contexts in f2");
|
|
if (swapcontext (&ctx[4], &ctx[2]) != 0)
|
|
{
|
|
printf ("%s: setcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
puts ("end f2");
|
|
exit (done == 2 ? EXIT_SUCCESS : EXIT_FAILURE);
|
|
}
|
|
|
|
static void
|
|
f1b (void)
|
|
{
|
|
if (done)
|
|
{
|
|
puts ("set context in f1b");
|
|
if (setcontext (&ctx[3]) != 0)
|
|
{
|
|
printf ("%s: setcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
}
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
static void
|
|
f1a (void)
|
|
{
|
|
static char st2[32768];
|
|
puts ("start f1a");
|
|
if (getcontext (&ctx[2]) != 0)
|
|
{
|
|
printf ("%s: getcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
ctx[2].uc_stack.ss_sp = st2;
|
|
ctx[2].uc_stack.ss_size = sizeof st2;
|
|
ctx[2].uc_link = &ctx[0];
|
|
makecontext (&ctx[2], (void (*) (void)) f1b, 0);
|
|
f2 ();
|
|
}
|
|
|
|
/* The execution path through the test looks like this:
|
|
do_test (call)
|
|
-> "making contexts"
|
|
-> "swap contexts"
|
|
f1a (via swapcontext to ctx[1], with alternate stack)
|
|
-> "start f1a"
|
|
f2 (call)
|
|
-> "swap contexts in f2"
|
|
f1b (via swapcontext to ctx[2], with alternate stack)
|
|
-> "set context in f1b"
|
|
do_test (via setcontext to ctx[3], main stack)
|
|
-> "setcontext"
|
|
f2 (via setcontext to ctx[4], with alternate stack)
|
|
-> "end f2"
|
|
|
|
We must use an alternate stack for f1b, because if we don't then the
|
|
result of executing an earlier caller may overwrite registers
|
|
spilled to the stack in f2. */
|
|
static int
|
|
do_test (void)
|
|
{
|
|
static char st1[32768];
|
|
puts ("making contexts");
|
|
if (getcontext (&ctx[0]) != 0)
|
|
{
|
|
printf ("%s: getcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
if (getcontext (&ctx[1]) != 0)
|
|
{
|
|
printf ("%s: getcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
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)) f1a, 0);
|
|
puts ("swap contexts");
|
|
if (swapcontext (&ctx[3], &ctx[1]) != 0)
|
|
{
|
|
printf ("%s: setcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
if (done != 1)
|
|
exit (EXIT_FAILURE);
|
|
done++;
|
|
puts ("set context");
|
|
if (setcontext (&ctx[4]) != 0)
|
|
{
|
|
printf ("%s: setcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
#include <support/test-driver.c>
|