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| author | Florian Weimer <fweimer@redhat.com> | 2021-12-09 09:49:32 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2021-12-09 09:49:32 +0100 |
| commit | 95e114a0919d844d8fe07839cb6538b7f5ee920e (patch) | |
| tree | 530964270c0a6baf1dd741e00c4f5f205631d70e /sysdeps/unix/sysv/linux/tst-rseq.h | |
| parent | 8d1927d8dc5aad0f01c929123086be3a5b799d18 (diff) | |
| download | glibc-95e114a0919d844d8fe07839cb6538b7f5ee920e.tar glibc-95e114a0919d844d8fe07839cb6538b7f5ee920e.tar.gz glibc-95e114a0919d844d8fe07839cb6538b7f5ee920e.tar.bz2 glibc-95e114a0919d844d8fe07839cb6538b7f5ee920e.zip | |
nptl: Add rseq registration
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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/tst-rseq.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/tst-rseq.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-rseq.h b/sysdeps/unix/sysv/linux/tst-rseq.h new file mode 100644 index 0000000000..a476c316fc --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-rseq.h @@ -0,0 +1,57 @@ +/* Restartable Sequences tests header. + Copyright (C) 2021 Free Software Foundation, Inc. + + 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 + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <error.h> +#include <stdbool.h> +#include <stdint.h> +#include <support/check.h> +#include <syscall.h> +#include <sys/rseq.h> +#include <tls.h> + +static inline bool +rseq_thread_registered (void) +{ + return THREAD_GETMEM_VOLATILE (THREAD_SELF, rseq_area.cpu_id) >= 0; +} + +static inline int +sys_rseq (struct rseq *rseq_abi, uint32_t rseq_len, int flags, uint32_t sig) +{ + return syscall (__NR_rseq, rseq_abi, rseq_len, flags, sig); +} + +static inline bool +rseq_available (void) +{ + int rc; + + rc = sys_rseq (NULL, 0, 0, 0); + if (rc != -1) + FAIL_EXIT1 ("Unexpected rseq return value %d", rc); + switch (errno) + { + case ENOSYS: + return false; + case EINVAL: + /* rseq is implemented, but detected an invalid rseq_len parameter. */ + return true; + default: + FAIL_EXIT1 ("Unexpected rseq error %s", strerror (errno)); + } +} |