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Update.
2003-09-01 Jakub Jelinek <jakub@redhat.com>
* Makefile (tests): Add tst-tls1.
(module-names): Add tst-tls1mod{,a,b,c,d,e,f}.
($(objpfx)tst-tls1mod{,a,b,c,d,e,f}.so-no-z-defs): Set to yes.
($(objpfx)tst-tls1): New.
($(objpfx)tst-tls2.out): Likewise.
(tests): Depend on $(objpfx)tst-tls2.out.
* tst-tls1.c: New test.
* tst-tls1.h: New.
* tst-tls1mod.c: New.
* tst-tls1moda.c: New.
* tst-tls1modb.c: New.
* tst-tls1modc.c: New.
* tst-tls1modd.c: New.
* tst-tls1mode.c: New.
* tst-tls1modf.c: New.
* tst-tls2.sh: New test.
This commit is contained in:
Ulrich Drepper
parent
e3a88560b9
commit
c874a32e88
@ -1,3 +1,22 @@
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2003-09-01 Jakub Jelinek <jakub@redhat.com>
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* Makefile (tests): Add tst-tls1.
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(module-names): Add tst-tls1mod{,a,b,c,d,e,f}.
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($(objpfx)tst-tls1mod{,a,b,c,d,e,f}.so-no-z-defs): Set to yes.
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($(objpfx)tst-tls1): New.
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($(objpfx)tst-tls2.out): Likewise.
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(tests): Depend on $(objpfx)tst-tls2.out.
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* tst-tls1.c: New test.
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* tst-tls1.h: New.
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* tst-tls1mod.c: New.
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* tst-tls1moda.c: New.
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* tst-tls1modb.c: New.
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* tst-tls1modc.c: New.
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* tst-tls1modd.c: New.
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* tst-tls1mode.c: New.
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* tst-tls1modf.c: New.
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* tst-tls2.sh: New test.
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2003-08-27 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/pthread/pthread.h: Don't mark pthread_exit,
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91
linuxthreads/tst-tls1.c
Normal file
91
linuxthreads/tst-tls1.c
Normal file
@ -0,0 +1,91 @@
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/* Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Check alignment, overlapping and layout of TLS variables. */
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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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#include <pthread.h>
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#include <sys/param.h>
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#include "tst-tls1.h"
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#ifdef TLS_REGISTER
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struct tls_obj tls_registry[64];
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static int
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tls_addr_cmp (const void *a, const void *b)
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{
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if (((struct tls_obj *)a)->addr < ((struct tls_obj *)b)->addr)
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return -1;
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if (((struct tls_obj *)a)->addr > ((struct tls_obj *)b)->addr)
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return 1;
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return 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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size_t cnt, i;
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int res = 0;
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uintptr_t min_addr = ~(uintptr_t) 0, max_addr = 0;
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for (cnt = 0; tls_registry[cnt].name; ++cnt);
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qsort (tls_registry, cnt, sizeof (struct tls_obj), tls_addr_cmp);
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for (i = 0; i < cnt; ++i)
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{
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printf ("%s = %p, size %zd, align %zd",
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tls_registry[i].name, (void *) tls_registry[i].addr,
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tls_registry[i].size, tls_registry[i].align);
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if (tls_registry[i].addr & (tls_registry[i].align - 1))
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{
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fputs (", WRONG ALIGNMENT", stdout);
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res = 1;
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}
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if (i > 0
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&& (tls_registry[i - 1].addr + tls_registry[i - 1].size
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> tls_registry[i].addr))
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{
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fputs (", ADDRESS OVERLAP", stdout);
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res = 1;
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}
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puts ("");
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min_addr = MIN (tls_registry[i].addr, min_addr);
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max_addr = MAX (tls_registry[i].addr + tls_registry[i].size,
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max_addr);
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}
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if (cnt > 1)
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printf ("Initial TLS used block size %zd\n",
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(size_t) (max_addr - min_addr));
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return res;
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}
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#define TEST_FUNCTION do_test ()
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#else
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#define TEST_FUNCTION 0
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#endif
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#include "../test-skeleton.c"
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28
linuxthreads/tst-tls1.h
Normal file
28
linuxthreads/tst-tls1.h
Normal file
@ -0,0 +1,28 @@
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#include <stdint.h>
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#include <stdlib.h>
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#include <tls.h>
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#if USE_TLS && HAVE___THREAD
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struct tls_obj
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{
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const char *name;
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uintptr_t addr;
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size_t size;
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size_t align;
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};
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extern struct tls_obj tls_registry[];
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#define TLS_REGISTER(x) \
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static void __attribute__((constructor)) \
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tls_register_##x (void) \
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{ \
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size_t i; \
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for (i = 0; tls_registry[i].name; ++i); \
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tls_registry[i].name = #x; \
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tls_registry[i].addr = (uintptr_t) &x; \
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tls_registry[i].size = sizeof (x); \
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tls_registry[i].align = __alignof__ (x); \
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}
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#endif
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6
linuxthreads/tst-tls1mod.c
Normal file
6
linuxthreads/tst-tls1mod.c
Normal file
@ -0,0 +1,6 @@
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#include <tst-tls1.h>
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#ifdef TLS_REGISTER
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/* Ensure tls_registry is exported from the binary. */
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void *tst_tls1mod attribute_hidden = tls_registry;
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#endif
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6
linuxthreads/tst-tls1moda.c
Normal file
6
linuxthreads/tst-tls1moda.c
Normal file
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#include <tst-tls1.h>
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#ifdef TLS_REGISTER
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static __thread char a [32] __attribute__ ((aligned (64)));
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TLS_REGISTER (a)
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#endif
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6
linuxthreads/tst-tls1modb.c
Normal file
6
linuxthreads/tst-tls1modb.c
Normal file
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#include <tst-tls1.h>
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#ifdef TLS_REGISTER
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static __thread int b;
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TLS_REGISTER (b)
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#endif
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6
linuxthreads/tst-tls1modc.c
Normal file
6
linuxthreads/tst-tls1modc.c
Normal file
@ -0,0 +1,6 @@
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#include <tst-tls1.h>
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#ifdef TLS_REGISTER
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static __thread int c;
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TLS_REGISTER (c)
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#endif
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6
linuxthreads/tst-tls1modd.c
Normal file
6
linuxthreads/tst-tls1modd.c
Normal file
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#include <tst-tls1.h>
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#ifdef TLS_REGISTER
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static __thread int d;
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TLS_REGISTER (d)
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#endif
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8
linuxthreads/tst-tls1mode.c
Normal file
8
linuxthreads/tst-tls1mode.c
Normal file
@ -0,0 +1,8 @@
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#include <tst-tls1.h>
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#ifdef TLS_REGISTER
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static __thread int e1 = 24;
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static __thread char e2 [32] __attribute__ ((aligned (64)));
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TLS_REGISTER (e1)
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TLS_REGISTER (e2)
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#endif
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9
linuxthreads/tst-tls1modf.c
Normal file
9
linuxthreads/tst-tls1modf.c
Normal file
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#include <tst-tls1.h>
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#ifdef TLS_REGISTER
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char tst_tls1modf[60] attribute_hidden = { 26 };
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static __thread int f1 = 24;
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static __thread char f2 [32] __attribute__ ((aligned (64)));
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TLS_REGISTER (f1)
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TLS_REGISTER (f2)
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#endif
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53
linuxthreads/tst-tls2.sh
Normal file
53
linuxthreads/tst-tls2.sh
Normal file
@ -0,0 +1,53 @@
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#!/bin/sh
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common_objpfx=$1; shift
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elf_objpfx=$1; shift
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rtld_installed_name=$1; shift
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logfile=$common_objpfx/linuxthreads/tst-tls2.out
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# We have to find libc and linuxthreads
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library_path=${common_objpfx}:${common_objpfx}linuxthreads
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tst_tls1="${elf_objpfx}${rtld_installed_name} --library-path ${library_path} \
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${common_objpfx}/linuxthreads/tst-tls1"
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LC_ALL=C
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export LC_ALL
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LANG=C
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export LANG
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> $logfile
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fail=0
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for aligned in a e f; do
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echo "preload tst-tls1mod{$aligned,b,c,d}.so" >> $logfile
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echo "===============" >> $logfile
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LD_PRELOAD=`echo ${common_objpfx}linuxthreads/tst-tls1mod{$aligned,b,c,d}.so \
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| sed 's/:$//;s/: /:/g'` ${tst_tls1} >> $logfile || fail=1
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echo >> $logfile
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echo "preload tst-tls1mod{b,$aligned,c,d}.so" >> $logfile
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echo "===============" >> $logfile
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LD_PRELOAD=`echo ${common_objpfx}linuxthreads/tst-tls1mod{b,$aligned,c,d}.so \
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| sed 's/:$//;s/: /:/g'` ${tst_tls1} >> $logfile || fail=1
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echo >> $logfile
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echo "preload tst-tls1mod{b,c,d,$aligned}.so" >> $logfile
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echo "===============" >> $logfile
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LD_PRELOAD=`echo ${common_objpfx}linuxthreads/tst-tls1mod{b,c,d,$aligned}.so \
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| sed 's/:$//;s/: /:/g'` ${tst_tls1} >> $logfile || fail=1
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echo >> $logfile
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done
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echo "preload tst-tls1mod{d,a,b,c,e}" >> $logfile
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echo "===============" >> $logfile
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LD_PRELOAD=`echo ${common_objpfx}linuxthreads/tst-tls1mod{d,a,b,c,e}.so \
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| sed 's/:$//;s/: /:/g'` ${tst_tls1} >> $logfile || fail=1
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echo >> $logfile
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echo "preload tst-tls1mod{d,a,b,e,f}" >> $logfile
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echo "===============" >> $logfile
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LD_PRELOAD=`echo ${common_objpfx}linuxthreads/tst-tls1mod{d,a,b,e,f}.so \
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| sed 's/:$//;s/: /:/g'` ${tst_tls1} >> $logfile || fail=1
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echo >> $logfile
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exit $fail
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@ -1,3 +1,26 @@
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2003-09-01 Jakub Jelinek <jakub@redhat.com>
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* Makefile (tests): Add tst-tls5.
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(module-names): Add tst-tls5mod{,a,b,c,d,e,f}.
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($(objpfx)tst-tls5mod{,a,b,c,d,e,f}.so-no-z-defs): Set to yes.
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($(objpfx)tst-tls5): New.
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($(objpfx)tst-tls6.out): Likewise.
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(tests): Depend on $(objpfx)tst-tls6.out.
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* tst-tls3.c: Include stdint.h and pthreaddef.h.
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(do_test): Check pthread_self () return value alignment.
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* tst-tls3mod.c: Include stdint.h and pthreaddef.h.
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(tf): Check pthread_self () return value alignment.
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* tst-tls5.c: New test.
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* tst-tls5.h: New.
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* tst-tls5mod.c: New.
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* tst-tls5moda.c: New.
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* tst-tls5modb.c: New.
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* tst-tls5modc.c: New.
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* tst-tls5modd.c: New.
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* tst-tls5mode.c: New.
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* tst-tls5modf.c: New.
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* tst-tls6.sh: New test.
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2003-09-01 Jakub Jelinek <jakub@redhat.com>
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* sysdeps/unix/sysv/linux/alpha/timer_create.c: New file.
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@ -252,10 +252,12 @@ tests += tst-cancelx2 tst-cancelx3 tst-cancelx4 tst-cancelx5 \
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tst-oncex3 tst-oncex4
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endif
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ifeq ($(build-shared),yes)
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tests += tst-atfork2 tst-tls3 tst-tls4 tst-_res1
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tests += tst-atfork2 tst-tls3 tst-tls4 tst-tls5 tst-_res1
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endif
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modules-names = tst-atfork2mod tst-tls3mod tst-tls4moda tst-tls4modb \
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tst-tls5mod tst-tls5moda tst-tls5modb tst-tls5modc \
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tst-tls5modd tst-tls5mode tst-tls5modf \
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tst-_res1mod1 tst-_res1mod2
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extra-objs += $(addsuffix .os,$(strip $(modules-names)))
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test-extras += $(modules-names)
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@ -263,6 +265,13 @@ test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(modules-names)))
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tst-atfork2mod.so-no-z-defs = yes
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tst-tls3mod.so-no-z-defs = yes
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tst-tls5mod.so-no-z-defs = yes
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tst-tls5moda.so-no-z-defs = yes
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tst-tls5modb.so-no-z-defs = yes
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tst-tls5modc.so-no-z-defs = yes
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tst-tls5modd.so-no-z-defs = yes
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tst-tls5mode.so-no-z-defs = yes
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tst-tls5modf.so-no-z-defs = yes
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$(test-modules): $(objpfx)%.so: $(objpfx)%.os $(common-objpfx)shlib.lds
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$(build-module)
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@ -400,6 +409,18 @@ $(objpfx)tst-tls3mod.so: $(shared-thread-library)
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$(objpfx)tst-tls4: $(libdl) $(shared-thread-library)
|
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$(objpfx)tst-tls4.out: $(objpfx)tst-tls4moda.so $(objpfx)tst-tls4modb.so
|
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$(objpfx)tst-tls5: $(objpfx)tst-tls5mod.so $(shared-thread-library)
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ifeq ($(build-shared),yes)
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tests: $(objpfx)tst-tls6.out
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$(objpfx)tst-tls6.out: tst-tls6.sh $(objpfx)tst-tls5 \
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$(objpfx)tst-tls5moda.so $(objpfx)tst-tls5modb.so \
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$(objpfx)tst-tls5modc.so $(objpfx)tst-tls5modd.so \
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$(objpfx)tst-tls5mode.so $(objpfx)tst-tls5modf.so
|
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$(SHELL) -e tst-tls6.sh $(common-objpfx) $(elf-objpfx) \
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$(rtld-installed-name)
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endif
|
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$(objpfx)tst-dlsym1: $(libdl) $(shared-thread-library)
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ifeq (yes,$(build-shared))
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@ -22,10 +22,11 @@
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#include <pthread.h>
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#include <signal.h>
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#include <semaphore.h>
|
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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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#include <unistd.h>
|
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|
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#include <pthreaddef.h>
|
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|
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#define THE_SIG SIGUSR1
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@ -79,6 +80,12 @@ do_test (void)
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return 0;
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#else
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if ((uintptr_t) pthread_self () & (TCB_ALIGNMENT - 1))
|
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{
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puts ("initial thread's struct pthread not aligned enough");
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exit (1);
|
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}
|
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|
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if (pthread_barrier_init (&b, NULL, N + 1) != 0)
|
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{
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puts ("barrier_init failed");
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@ -20,10 +20,11 @@
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#include <pthread.h>
|
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#include <semaphore.h>
|
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#include <signal.h>
|
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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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#include <unistd.h>
|
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|
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#include <pthreaddef.h>
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#if HAVE___THREAD
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@ -61,6 +62,12 @@ handler (int sig)
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void *
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tf (void *arg)
|
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{
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if ((uintptr_t) pthread_self () & (TCB_ALIGNMENT - 1))
|
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{
|
||||
puts ("thread's struct pthread not aligned enough");
|
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exit (1);
|
||||
}
|
||||
|
||||
if (fp != NULL)
|
||||
{
|
||||
puts ("fp not initially NULL");
|
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|
||||
120
nptl/tst-tls5.c
Normal file
120
nptl/tst-tls5.c
Normal file
@ -0,0 +1,120 @@
|
||||
/* Copyright (C) 2003 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
|
||||
|
||||
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, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
/* Check alignment, overlapping and layout of TLS variables. */
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <pthread.h>
|
||||
#include <pthreadP.h>
|
||||
#include <sys/param.h>
|
||||
|
||||
#include "tst-tls5.h"
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
|
||||
struct tls_obj tls_registry[64];
|
||||
|
||||
static int
|
||||
tls_addr_cmp (const void *a, const void *b)
|
||||
{
|
||||
if (((struct tls_obj *)a)->addr < ((struct tls_obj *)b)->addr)
|
||||
return -1;
|
||||
if (((struct tls_obj *)a)->addr > ((struct tls_obj *)b)->addr)
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
do_test (void)
|
||||
{
|
||||
size_t cnt, i;
|
||||
int res = 0;
|
||||
uintptr_t min_addr = ~(uintptr_t) 0, max_addr = 0;
|
||||
|
||||
for (cnt = 0; tls_registry[cnt].name; ++cnt);
|
||||
tls_registry[cnt].name = NULL;
|
||||
tls_registry[cnt].addr = (uintptr_t) pthread_self ();
|
||||
tls_registry[cnt].size = sizeof (struct pthread);
|
||||
tls_registry[cnt++].align = __alignof__ (struct pthread);
|
||||
|
||||
qsort (tls_registry, cnt, sizeof (struct tls_obj), tls_addr_cmp);
|
||||
|
||||
for (i = 0; i < cnt; ++i)
|
||||
{
|
||||
printf ("%s%s = %p, size %zd, align %zd",
|
||||
tls_registry[i].name ? "&" : "",
|
||||
tls_registry[i].name ?: "pthread_self ()",
|
||||
(void *) tls_registry[i].addr,
|
||||
tls_registry[i].size, tls_registry[i].align);
|
||||
if (tls_registry[i].addr & (tls_registry[i].align - 1))
|
||||
{
|
||||
fputs (", WRONG ALIGNMENT", stdout);
|
||||
res = 1;
|
||||
}
|
||||
if (i > 0
|
||||
&& (tls_registry[i - 1].addr + tls_registry[i - 1].size
|
||||
> tls_registry[i].addr))
|
||||
{
|
||||
fputs (", ADDRESS OVERLAP", stdout);
|
||||
res = 1;
|
||||
}
|
||||
puts ("");
|
||||
if (tls_registry[i].name)
|
||||
{
|
||||
min_addr = MIN (tls_registry[i].addr, min_addr);
|
||||
max_addr = MAX (tls_registry[i].addr + tls_registry[i].size,
|
||||
max_addr);
|
||||
}
|
||||
}
|
||||
|
||||
if (cnt > 1)
|
||||
{
|
||||
#if TLS_TCB_AT_TP
|
||||
if (tls_registry[cnt - 1].name)
|
||||
{
|
||||
puts ("pthread_self () not larger than all TLS addresses");
|
||||
res = 1;
|
||||
}
|
||||
else
|
||||
max_addr = MAX (tls_registry[cnt - 1].addr, max_addr);
|
||||
#elif TLS_DTV_AT_TP
|
||||
if (tls_registry[0].name)
|
||||
{
|
||||
puts ("pthread_self () not smaller than all TLS addresses");
|
||||
res = 1;
|
||||
}
|
||||
#else
|
||||
abort ();
|
||||
#endif
|
||||
printf ("Initial TLS used block size %zd\n",
|
||||
(size_t) (max_addr - min_addr));
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
#define TEST_FUNCTION do_test ()
|
||||
|
||||
#else
|
||||
|
||||
#define TEST_FUNCTION 0
|
||||
|
||||
#endif
|
||||
|
||||
#include "../test-skeleton.c"
|
||||
28
nptl/tst-tls5.h
Normal file
28
nptl/tst-tls5.h
Normal file
@ -0,0 +1,28 @@
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <tls.h>
|
||||
|
||||
#if USE_TLS && HAVE___THREAD
|
||||
|
||||
struct tls_obj
|
||||
{
|
||||
const char *name;
|
||||
uintptr_t addr;
|
||||
size_t size;
|
||||
size_t align;
|
||||
};
|
||||
extern struct tls_obj tls_registry[];
|
||||
|
||||
#define TLS_REGISTER(x) \
|
||||
static void __attribute__((constructor)) \
|
||||
tls_register_##x (void) \
|
||||
{ \
|
||||
size_t i; \
|
||||
for (i = 0; tls_registry[i].name; ++i); \
|
||||
tls_registry[i].name = #x; \
|
||||
tls_registry[i].addr = (uintptr_t) &x; \
|
||||
tls_registry[i].size = sizeof (x); \
|
||||
tls_registry[i].align = __alignof__ (x); \
|
||||
}
|
||||
|
||||
#endif
|
||||
6
nptl/tst-tls5mod.c
Normal file
6
nptl/tst-tls5mod.c
Normal file
@ -0,0 +1,6 @@
|
||||
#include <tst-tls5.h>
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
/* Ensure tls_registry is exported from the binary. */
|
||||
void *tst_tls5mod attribute_hidden = tls_registry;
|
||||
#endif
|
||||
6
nptl/tst-tls5moda.c
Normal file
6
nptl/tst-tls5moda.c
Normal file
@ -0,0 +1,6 @@
|
||||
#include <tst-tls5.h>
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
static __thread char a [32] __attribute__ ((aligned (64)));
|
||||
TLS_REGISTER (a)
|
||||
#endif
|
||||
6
nptl/tst-tls5modb.c
Normal file
6
nptl/tst-tls5modb.c
Normal file
@ -0,0 +1,6 @@
|
||||
#include <tst-tls5.h>
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
static __thread int b;
|
||||
TLS_REGISTER (b)
|
||||
#endif
|
||||
6
nptl/tst-tls5modc.c
Normal file
6
nptl/tst-tls5modc.c
Normal file
@ -0,0 +1,6 @@
|
||||
#include <tst-tls5.h>
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
static __thread int c;
|
||||
TLS_REGISTER (c)
|
||||
#endif
|
||||
6
nptl/tst-tls5modd.c
Normal file
6
nptl/tst-tls5modd.c
Normal file
@ -0,0 +1,6 @@
|
||||
#include <tst-tls5.h>
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
static __thread int d;
|
||||
TLS_REGISTER (d)
|
||||
#endif
|
||||
8
nptl/tst-tls5mode.c
Normal file
8
nptl/tst-tls5mode.c
Normal file
@ -0,0 +1,8 @@
|
||||
#include <tst-tls5.h>
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
static __thread int e1 = 24;
|
||||
static __thread char e2 [32] __attribute__ ((aligned (64)));
|
||||
TLS_REGISTER (e1)
|
||||
TLS_REGISTER (e2)
|
||||
#endif
|
||||
9
nptl/tst-tls5modf.c
Normal file
9
nptl/tst-tls5modf.c
Normal file
@ -0,0 +1,9 @@
|
||||
#include <tst-tls5.h>
|
||||
|
||||
#ifdef TLS_REGISTER
|
||||
char tst_tls5modf[60] attribute_hidden = { 26 };
|
||||
static __thread int f1 = 24;
|
||||
static __thread char f2 [32] __attribute__ ((aligned (64)));
|
||||
TLS_REGISTER (f1)
|
||||
TLS_REGISTER (f2)
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user