From 1a1a6bde63e0af0d5f2f3465ba45338e7513c4e4 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Tue, 2 Jun 2015 16:55:36 -0700 Subject: BZ#18383: Another test case, with TLS refs and defs in separate TUs. --- elf/tst-tlsalign-extern.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 elf/tst-tlsalign-extern.c (limited to 'elf/tst-tlsalign-extern.c') diff --git a/elf/tst-tlsalign-extern.c b/elf/tst-tlsalign-extern.c new file mode 100644 index 0000000000..661b6712e3 --- /dev/null +++ b/elf/tst-tlsalign-extern.c @@ -0,0 +1,74 @@ +/* Test for large alignment in TLS blocks (extern case), BZ#18383. + Copyright (C) 2015 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 + . */ + +#include +#include +#include + +/* This is the same as tst-tlsalign-static.c, except that it uses + TLS variables that are defined in a separate translation unit + (ts-tlsalign-vars.c). It turned out that the cause of BZ#18383 + on ARM was actually an ARM assembler bug triggered by the ways of + using .tdata/.tbss sections and relocs referring to them that GCC + chooses when the variables are defined in the same translation + unit that contains the references. */ + +extern __thread int tdata1; +extern __thread int tdata2; +extern __thread int tdata3; +extern __thread int tbss1; +extern __thread int tbss2; +extern __thread int tbss3; + +static int +test_one (const char *which, unsigned int alignment, int *var, int value) +{ + uintptr_t addr = (uintptr_t) var; + unsigned int misalign = addr & (alignment - 1); + + printf ("%s TLS address %p %% %u = %u\n", + which, (void *) var, alignment, misalign); + + int got = *var; + if (got != value) + { + printf ("%s value %d should be %d\n", which, got, value); + return 1; + } + + return misalign != 0; +} + +static int +do_test (void) +{ + int fail = 0; + + fail |= test_one ("tdata1", 4, &tdata1, 1); + fail |= test_one ("tdata2", 0x10, &tdata2, 2); + fail |= test_one ("tdata3", 0x1000, &tdata3, 4); + + fail |= test_one ("tbss1", 4, &tbss1, 0); + fail |= test_one ("tbss2", 0x10, &tbss2, 0); + fail |= test_one ("tbss3", 0x1000, &tbss3, 0); + + return fail ? EXIT_FAILURE : EXIT_SUCCESS; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" -- cgit 1.4.1