mirror of git://sourceware.org/git/glibc.git
58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/* Check compile-time definition of TLS_TP_OFFSET against run-time value.
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Copyright (C) 2025 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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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#include <thread_pointer.h>
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#include <dl-tls.h>
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#include <link.h>
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <support/check.h>
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static __thread char thread_var __attribute__ ((tls_model ("initial-exec")));
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static int
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do_test (void)
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{
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printf ("thread variable address: %p\n", &thread_var);
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printf ("thread pointer address: %p\n", __thread_pointer ());
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printf ("pthread_self address: %p\n", (void *) pthread_self ());
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ptrdiff_t block_offset = ((struct link_map *) _r_debug.r_map)->l_tls_offset;
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printf ("main program TLS block offset: %td\n", block_offset);
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if ((uintptr_t) &thread_var < (uintptr_t) THREAD_SELF)
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{
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puts("TLS variables are located before struct pthread.");
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TEST_COMPARE (((intptr_t) __thread_pointer () - block_offset)
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- (intptr_t) &thread_var,
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TLS_TP_OFFSET);
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}
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else
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{
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puts("TLS variables are located after struct pthread.");
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TEST_COMPARE (((intptr_t) __thread_pointer () + block_offset)
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- (intptr_t) &thread_var,
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TLS_TP_OFFSET);
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}
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return 0;
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}
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#include <support/test-driver.c>
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