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BZ#18383: Another test case, with TLS refs and defs in separate TUs.

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This commit is contained in:
Roland McGrath 2015-06-02 16:55:36 -07:00
parent e0c349b40c
commit 1a1a6bde63
5 changed files with 125 additions and 3 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2015-06-02 Roland McGrath <roland@hack.frob.com>
[BZ #18383]
* elf/tst-tlsalign-extern.c: New file.
* elf/tst-tlsalign-extern-static.c: New file.
* elf/tst-tlsalign-vars.c: New file.
* elf/Makefile (tests-static): Add tst-tlsalign-extern-static.
[$(build-shared) = yes] (tests): Add tst-tlsalign-extern.
($(objpfx)tst-tlsalign-extern): Depend on tst-tlsalign-vars.o.
($(objpfx)tst-tlsalign-extern-static): Likewise.
(test-xfail-tst-tlsalign-extern-static): New variable.
2015-06-02 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h (INLINE_SYSCALL):

13
elf/Makefile
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@ -121,7 +121,8 @@ tests = tst-tls1 tst-tls2 tst-tls9 tst-leaks1 \
tst-auxv
tests-static = tst-tls1-static tst-tls2-static tst-stackguard1-static \
tst-leaks1-static tst-array1-static tst-array5-static \
tst-ptrguard1-static tst-dl-iter-static tst-tlsalign-static
tst-ptrguard1-static tst-dl-iter-static \
tst-tlsalign-static tst-tlsalign-extern-static
ifeq (yes,$(build-shared))
tests-static += tst-tls9-static
tst-tls9-static-ENV = \
@ -146,7 +147,7 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
tst-stackguard1 tst-addr1 tst-thrlock \
tst-unique1 tst-unique2 $(if $(CXX),tst-unique3 tst-unique4) \
tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \
tst-ptrguard1 tst-tlsalign
tst-ptrguard1 tst-tlsalign tst-tlsalign-extern
# reldep9
ifeq ($(build-hardcoded-path-in-tests),yes)
tests += tst-dlopen-aout
@ -528,10 +529,16 @@ $(objpfx)tst-initorder: $(objpfx)tst-initordera4.so $(objpfx)tst-initordera1.so
$(objpfx)tst-null-argv: $(objpfx)tst-null-argv-lib.so
$(objpfx)tst-tlsalign: $(objpfx)tst-tlsalign-lib.so
# BZ#18383: broken on at least ARM (both) and x86-64 (static only).
# BZ#18383: broken on at least ARM (both) and i386/x86-64 (static only).
test-xfail-tst-tlsalign = yes
test-xfail-tst-tlsalign-static = yes
$(objpfx)tst-tlsalign-extern: $(objpfx)tst-tlsalign-vars.o
$(objpfx)tst-tlsalign-extern-static: $(objpfx)tst-tlsalign-vars.o
# BZ#18383: broken on at least i386/x86-64 (static only).
test-xfail-tst-tlsalign-extern-static = yes
tst-null-argv-ENV = LD_DEBUG=all LD_DEBUG_OUTPUT=$(objpfx)tst-null-argv.debug.out
LDFLAGS-nodel2mod3.so = $(no-as-needed)
LDFLAGS-reldepmod5.so = $(no-as-needed)

1
elf/tst-tlsalign-extern-static.c Normal file
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#include "tst-tlsalign-extern.c"

74
elf/tst-tlsalign-extern.c Normal file
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@ -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
<http://www.gnu.org/licenses/>. */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
/* 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"

28
elf/tst-tlsalign-vars.c Normal file
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/* This is for tst-tlsalign-extern.c, which see. It's essential for the
purpose of the test that these definitions be in a separate translation
unit from the code using the variables. */
__thread int tdata1 = 1;
__thread int tdata2 __attribute__ ((aligned (0x10))) = 2;
__thread int tdata3 __attribute__ ((aligned (0x1000))) = 4;
__thread int tbss1;
__thread int tbss2 __attribute__ ((aligned (0x10)));
__thread int tbss3 __attribute__ ((aligned (0x1000)));
/* This function is never called. But its presence in this translation
unit makes GCC emit the variables above in the order defined (perhaps
because it's the order in which they're used here?) rather than
reordering them into descending order of alignment requirement--and so
keeps it more similar to the tst-tlsalign-static.c case--just in case
that affects the bug (though there is no evidence that it does). */
void
unused (void)
{
tdata1 = -1;
tdata2 = -2;
tdata3 = -3;
tbss1 = -4;
tbss2 = -5;
tbss3 = -6;
}