mirror of git://sourceware.org/git/glibc.git
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* Test for large alignment in TLS blocks (extern case), BZ#18383.
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Copyright (C) 2015-2020 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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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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/* This is the same as tst-tlsalign-static.c, except that it uses
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TLS variables that are defined in a separate translation unit
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(ts-tlsalign-vars.c). It turned out that the cause of BZ#18383
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on ARM was actually an ARM assembler bug triggered by the ways of
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using .tdata/.tbss sections and relocs referring to them that GCC
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chooses when the variables are defined in the same translation
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unit that contains the references. */
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extern __thread int tdata1;
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extern __thread int tdata2;
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extern __thread int tdata3;
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extern __thread int tbss1;
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extern __thread int tbss2;
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extern __thread int tbss3;
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static int
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test_one (const char *which, unsigned int alignment, int *var, int value)
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{
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uintptr_t addr = (uintptr_t) var;
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unsigned int misalign = addr & (alignment - 1);
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printf ("%s TLS address %p %% %u = %u\n",
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which, (void *) var, alignment, misalign);
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int got = *var;
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if (got != value)
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{
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printf ("%s value %d should be %d\n", which, got, value);
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return 1;
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}
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return misalign != 0;
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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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int fail = 0;
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fail |= test_one ("tdata1", 4, &tdata1, 1);
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fail |= test_one ("tdata2", 0x10, &tdata2, 2);
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fail |= test_one ("tdata3", 0x1000, &tdata3, 4);
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fail |= test_one ("tbss1", 4, &tbss1, 0);
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fail |= test_one ("tbss2", 0x10, &tbss2, 0);
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fail |= test_one ("tbss3", 0x1000, &tbss3, 0);
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return fail ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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#include <support/test-driver.c>
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