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f841c97e51
The function f1a, executed on a stack of size 32k, allocates an object of size 32k on the stack. Make the stack variables static to reduce excessive stack usage.
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/* Check setcontext on the context from makecontext.
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Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include <stdatomic.h>
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static ucontext_t ctx[5];
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static atomic_int done;
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static void
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__attribute__((noinline, noclone))
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f2 (void)
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{
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done++;
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puts ("swap contexts in f2");
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if (swapcontext (&ctx[4], &ctx[2]) != 0)
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{
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printf ("%s: setcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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puts ("end f2");
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exit (done == 2 ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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static void
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f1b (void)
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{
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if (done)
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{
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puts ("set context in f1b");
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if (setcontext (&ctx[3]) != 0)
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{
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printf ("%s: setcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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}
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exit (EXIT_FAILURE);
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}
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static void
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f1a (void)
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{
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static char st2[32768];
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puts ("start f1a");
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if (getcontext (&ctx[2]) != 0)
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{
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printf ("%s: getcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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ctx[2].uc_stack.ss_sp = st2;
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ctx[2].uc_stack.ss_size = sizeof st2;
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ctx[2].uc_link = &ctx[0];
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makecontext (&ctx[2], (void (*) (void)) f1b, 0);
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f2 ();
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}
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/* The execution path through the test looks like this:
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do_test (call)
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-> "making contexts"
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-> "swap contexts"
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f1a (via swapcontext to ctx[1], with alternate stack)
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-> "start f1a"
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f2 (call)
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-> "swap contexts in f2"
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f1b (via swapcontext to ctx[2], with alternate stack)
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-> "set context in f1b"
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do_test (via setcontext to ctx[3], main stack)
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-> "setcontext"
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f2 (via setcontext to ctx[4], with alternate stack)
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-> "end f2"
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We must use an alternate stack for f1b, because if we don't then the
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result of executing an earlier caller may overwrite registers
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spilled to the stack in f2. */
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static int
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do_test (void)
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{
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static char st1[32768];
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puts ("making contexts");
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if (getcontext (&ctx[0]) != 0)
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{
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printf ("%s: getcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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if (getcontext (&ctx[1]) != 0)
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{
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printf ("%s: getcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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ctx[1].uc_stack.ss_sp = st1;
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ctx[1].uc_stack.ss_size = sizeof st1;
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ctx[1].uc_link = &ctx[0];
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makecontext (&ctx[1], (void (*) (void)) f1a, 0);
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puts ("swap contexts");
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if (swapcontext (&ctx[3], &ctx[1]) != 0)
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{
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printf ("%s: setcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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if (done != 1)
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exit (EXIT_FAILURE);
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done++;
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puts ("set context");
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if (setcontext (&ctx[4]) != 0)
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{
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printf ("%s: setcontext: %m\n", __FUNCTION__);
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exit (EXIT_FAILURE);
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}
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exit (EXIT_FAILURE);
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}
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#include <support/test-driver.c>
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