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The rseq area is placed directly into struct pthread. rseq registration failure is not treated as an error, so it is possible that threads run with inconsistent registration status. <sys/rseq.h> is not yet installed as a public header. Co-Authored-By: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* Restartable Sequences tests header.
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Copyright (C) 2021 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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#include <errno.h>
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#include <error.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <support/check.h>
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#include <syscall.h>
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#include <sys/rseq.h>
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#include <tls.h>
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static inline bool
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rseq_thread_registered (void)
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{
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return THREAD_GETMEM_VOLATILE (THREAD_SELF, rseq_area.cpu_id) >= 0;
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}
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static inline int
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sys_rseq (struct rseq *rseq_abi, uint32_t rseq_len, int flags, uint32_t sig)
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{
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return syscall (__NR_rseq, rseq_abi, rseq_len, flags, sig);
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}
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static inline bool
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rseq_available (void)
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{
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int rc;
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rc = sys_rseq (NULL, 0, 0, 0);
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if (rc != -1)
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FAIL_EXIT1 ("Unexpected rseq return value %d", rc);
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switch (errno)
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{
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case ENOSYS:
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return false;
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case EINVAL:
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/* rseq is implemented, but detected an invalid rseq_len parameter. */
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return true;
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default:
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FAIL_EXIT1 ("Unexpected rseq error %s", strerror (errno));
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}
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}
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