113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/* Test dlopen of modules with initial-exec TLS after dlmopen.
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Copyright (C) 2016-2022 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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<https://www.gnu.org/licenses/>. */
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/* This test tries to check that surplus static TLS is not used up for
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dynamic TLS optimizations and 4*144 = 576 bytes of static TLS is
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still available for dlopening modules with initial-exec TLS after 3
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new dlmopen namespaces are created. It depends on rtld.nns=4 and
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rtld.optional_static_tls=512 tunable settings. */
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#include <errno.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static int do_test (void);
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#include <support/xthread.h>
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#include <support/xdlfcn.h>
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#include <support/check.h>
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#include <support/test-driver.c>
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/* Have some big TLS in the main exe: should not use surplus TLS. */
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__thread char maintls[1000];
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static pthread_barrier_t barrier;
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/* Forces multi-threaded behaviour. */
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static void *
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blocked_thread_func (void *closure)
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{
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xpthread_barrier_wait (&barrier);
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/* TLS load and access tests run here in the main thread. */
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xpthread_barrier_wait (&barrier);
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return NULL;
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}
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static void *
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load_and_access (Lmid_t lmid, const char *mod, const char *func)
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{
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/* Load module with TLS. */
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void *p = xdlmopen (lmid, mod, RTLD_NOW);
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/* Access the TLS variable to ensure it is allocated. */
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void (*f) (void) = (void (*) (void))xdlsym (p, func);
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f ();
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return p;
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}
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static int
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do_test (void)
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{
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void *mods[5];
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{
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int ret = pthread_barrier_init (&barrier, NULL, 2);
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if (ret != 0)
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{
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errno = ret;
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printf ("error: pthread_barrier_init: %m\n");
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exit (1);
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}
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}
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pthread_t blocked_thread = xpthread_create (NULL, blocked_thread_func, NULL);
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xpthread_barrier_wait (&barrier);
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printf ("maintls[%zu]:\t %p .. %p\n",
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sizeof maintls, maintls, maintls + sizeof maintls);
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memset (maintls, 1, sizeof maintls);
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/* Load modules with dynamic TLS (use surplus static TLS for libc
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in new namespaces and may be for TLS optimizations too). */
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mods[0] = load_and_access (LM_ID_BASE, "tst-tls-ie-mod0.so", "access0");
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mods[1] = load_and_access (LM_ID_NEWLM, "tst-tls-ie-mod1.so", "access1");
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mods[2] = load_and_access (LM_ID_NEWLM, "tst-tls-ie-mod2.so", "access2");
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mods[3] = load_and_access (LM_ID_NEWLM, "tst-tls-ie-mod3.so", "access3");
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/* Load modules with initial-exec TLS (can only use surplus static TLS). */
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mods[4] = load_and_access (LM_ID_BASE, "tst-tls-ie-mod6.so", "access6");
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/* Here 576 bytes + 3 * libc use of surplus static TLS is in use so less
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than 1024 bytes are available (exact number depends on TLS optimizations
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and the libc TLS use). */
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printf ("The next dlmopen should fail...\n");
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void *p = dlmopen (LM_ID_BASE, "tst-tls-ie-mod4.so", RTLD_NOW);
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if (p != NULL)
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FAIL_EXIT1 ("error: expected dlmopen to fail because there is "
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"not enough surplus static TLS.\n");
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printf ("...OK failed with: %s.\n", dlerror ());
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xpthread_barrier_wait (&barrier);
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xpthread_join (blocked_thread);
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/* Close the modules. */
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for (int i = 0; i < 5; ++i)
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xdlclose (mods[i]);
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return 0;
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}
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