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c813c1490d
Get the rseq feature size and alignment requirement from the auxiliary vector for use inside the dynamic loader. Use '__rseq_size' directly to store the feature size. If the main thread registration fails or is disabled by tunable, reset the value to 0. This will be used in the TLS block allocator to compute the size and alignment of the rseq area block for the extended ABI support. Signed-off-by: Michael Jeanson <mjeanson@efficios.com> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Florian Weimer <fweimer@redhat.com>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/* Restartable Sequences single-threaded tests.
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Copyright (C) 2021-2025 Free Software Foundation, Inc.
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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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/* These tests validate that rseq is registered from main in an executable
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not linked against libpthread. */
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#include <support/check.h>
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#include <stdio.h>
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#include <sys/rseq.h>
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#include <unistd.h>
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#ifdef RSEQ_SIG
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# include <errno.h>
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# include <error.h>
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# include <stdlib.h>
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# include <string.h>
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# include <syscall.h>
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# include <sys/auxv.h>
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# include <thread_pointer.h>
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# include <tls.h>
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# include "tst-rseq.h"
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static void
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do_rseq_main_test (void)
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{
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struct pthread *pd = THREAD_SELF;
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size_t rseq_feature_size = MIN (MAX (getauxval (AT_RSEQ_FEATURE_SIZE),
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RSEQ_AREA_SIZE_INITIAL_USED),
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RSEQ_AREA_SIZE_MAX_USED);
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TEST_VERIFY_EXIT (rseq_thread_registered ());
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TEST_COMPARE (__rseq_flags, 0);
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TEST_VERIFY ((char *) __thread_pointer () + __rseq_offset
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== (char *) &pd->rseq_area);
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TEST_COMPARE (__rseq_size, rseq_feature_size);
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}
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static void
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do_rseq_test (void)
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{
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if (!rseq_available ())
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{
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FAIL_UNSUPPORTED ("kernel does not support rseq, skipping test");
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}
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printf ("info: __rseq_size: %u\n", __rseq_size);
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printf ("info: __rseq_offset: %td\n", __rseq_offset);
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printf ("info: __rseq_flags: %u\n", __rseq_flags);
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printf ("info: getauxval (AT_RSEQ_FEATURE_SIZE): %ld\n",
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getauxval (AT_RSEQ_FEATURE_SIZE));
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printf ("info: getauxval (AT_RSEQ_ALIGN): %ld\n", getauxval (AT_RSEQ_ALIGN));
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do_rseq_main_test ();
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}
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#else /* RSEQ_SIG */
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static void
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do_rseq_test (void)
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{
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FAIL_UNSUPPORTED ("glibc does not define RSEQ_SIG, skipping test");
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}
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#endif /* RSEQ_SIG */
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static int
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do_test (void)
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{
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do_rseq_test ();
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return 0;
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}
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#include <support/test-driver.c>
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