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bbe4bbb6e8
elf/tls-macros.h was added for TLS testing when GCC did not support
__thread. __thread and tls_model attributes are mature now and have been
used by many newer tests.
Also delete tst-tls2.c which tests .tls_common (unused by modern GCC and
unsupported by Clang/LLD). .tls_common and .tbss definition are almost
identical after linking, so the runtime test doesn't add additional
coverage. Assembler and linker tests should be on the binutils side.
When LLD 13.0.0 is allowed in configure.ac
(https://sourceware.org/pipermail/libc-alpha/2021-August/129866.html),
`make check` result is on par with glibc built with GNU ld on aarch64
and x86_64.
As a future clean-up, TLS_GD/TLS_LD/TLS_IE/TLS_IE macros can be removed from
sysdeps/*/tls-macros.h. We can add optional -mtls-dialect={gnu2,trad}
tests to ensure coverage.
Tested on aarch64-linux-gnu, powerpc64le-linux-gnu, and x86_64-linux-gnu.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
(cherry picked from commit 33c50ef428)
130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
/* Test if an executable can read from the TLS from an STT_GNU_IFUNC resolver.
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Copyright (C) 2017-2021 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 <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <libc-symbols.h>
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__thread int bar;
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extern __thread int bar_gd asm ("bar") __attribute__ ((tls_model("global-dynamic")));
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static int *bar_ptr = NULL;
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static uint32_t resolver_platform = 0;
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int foo (void);
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int tcb_test (void);
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/* Offsets copied from tcb-offsets.h. */
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#ifdef __powerpc64__
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# define __TPREG "r13"
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# define __ATPLATOFF -28764
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#else
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# define __TPREG "r2"
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# define __ATPLATOFF -28724
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#endif
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uint32_t
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get_platform (void)
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{
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register unsigned long tp __asm__ (__TPREG);
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uint32_t tmp;
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__asm__ ("lwz %0,%1(%2)\n"
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: "=r" (tmp)
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: "i" (__ATPLATOFF), "b" (tp));
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return tmp;
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}
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void
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init_foo (void)
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{
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bar_ptr = &bar_gd;
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}
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int
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my_foo (void)
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{
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printf ("&bar = %p and bar_ptr = %p.\n", &bar, bar_ptr);
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return bar_ptr != NULL;
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}
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__ifunc (foo, foo, my_foo, void, init_foo);
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void
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init_tcb_test (void)
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{
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resolver_platform = get_platform ();
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}
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int
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my_tcb_test (void)
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{
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printf ("resolver_platform = 0x%"PRIx32
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" and current platform = 0x%"PRIx32".\n",
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resolver_platform, get_platform ());
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return resolver_platform != 0;
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}
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__ifunc (tcb_test, tcb_test, my_tcb_test, void, init_tcb_test);
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static int
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do_test (void)
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{
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int ret = 0;
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if (foo ())
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printf ("PASS: foo IFUNC resolver called once.\n");
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else
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{
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printf ("FAIL: foo IFUNC resolver not called once.\n");
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ret = 1;
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}
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if (&bar == bar_ptr)
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printf ("PASS: bar address read from IFUNC resolver is correct.\n");
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else
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{
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printf ("FAIL: bar address read from IFUNC resolver is incorrect.\n");
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ret = 1;
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}
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if (tcb_test ())
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printf ("PASS: tcb_test IFUNC resolver called once.\n");
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else
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{
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printf ("FAIL: tcb_test IFUNC resolver not called once.\n");
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ret = 1;
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}
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if (resolver_platform == get_platform ())
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printf ("PASS: platform read from IFUNC resolver is correct.\n");
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else
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{
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printf ("FAIL: platform read from IFUNC resolver is incorrect.\n");
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ret = 1;
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}
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return ret;
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}
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#include <support/test-driver.c>
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