1 files changed, 84 insertions, 0 deletions
diff --git a/sys/compat/linux/linux_rseq.c b/sys/compat/linux/linux_rseq.c
new file mode 100644
index 000000000000..e8de17318d60
--- /dev/null
+++ b/sys/compat/linux/linux_rseq.c
@@ -0,0 +1,84 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+
+#ifdef COMPAT_LINUX32
+#include <machine/../linux32/linux.h>
+#include <machine/../linux32/linux32_proto.h>
+#else
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#endif
+
+
+enum linux_rseq_cpu_id_state {
+	LINUX_RSEQ_CPU_ID_UNINITIALIZED			= -1,
+	LINUX_RSEQ_CPU_ID_REGISTRATION_FAILED		= -2,
+};
+
+enum linux_rseq_flags {
+	LINUX_RSEQ_FLAG_UNREGISTER			= (1 << 0),
+};
+
+enum linux_rseq_cs_flags_bit {
+	LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT	= 0,
+	LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT	= 1,
+	LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT	= 2,
+};
+
+enum linux_rseq_cs_flags {
+	LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT	=
+		(1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT),
+	LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL	=
+		(1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT),
+	LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE	=
+		(1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT),
+};
+
+struct linux_rseq_cs {
+	uint32_t version;
+	uint32_t flags;
+	uint64_t start_ip;
+	uint64_t post_commit_offset;
+	uint64_t abort_ip;
+} __attribute__((aligned(4 * sizeof(uint64_t))));
+
+struct linux_rseq {
+	uint32_t cpu_id_start;
+	uint32_t cpu_id;
+	uint64_t rseq_cs;
+	uint32_t flags;
+} __attribute__((aligned(4 * sizeof(uint64_t))));
+
+int
+linux_rseq(struct thread *td, struct linux_rseq_args *args)
+{
+
+	return (ENOSYS);
+}