1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30
31 #ifdef COMPAT_LINUX32
32 #include <machine/../linux32/linux.h>
33 #include <machine/../linux32/linux32_proto.h>
34 #else
35 #include <machine/../linux/linux.h>
36 #include <machine/../linux/linux_proto.h>
37 #endif
38
39
40 enum linux_rseq_cpu_id_state {
41 LINUX_RSEQ_CPU_ID_UNINITIALIZED = -1,
42 LINUX_RSEQ_CPU_ID_REGISTRATION_FAILED = -2,
43 };
44
45 enum linux_rseq_flags {
46 LINUX_RSEQ_FLAG_UNREGISTER = (1 << 0),
47 };
48
49 enum linux_rseq_cs_flags_bit {
50 LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT = 0,
51 LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT = 1,
52 LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT = 2,
53 };
54
55 enum linux_rseq_cs_flags {
56 LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT =
57 (1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT),
58 LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL =
59 (1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT),
60 LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE =
61 (1U << LINUX_RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT),
62 };
63
64 struct linux_rseq_cs {
65 uint32_t version;
66 uint32_t flags;
67 uint64_t start_ip;
68 uint64_t post_commit_offset;
69 uint64_t abort_ip;
70 } __attribute__((aligned(4 * sizeof(uint64_t))));
71
72 struct linux_rseq {
73 uint32_t cpu_id_start;
74 uint32_t cpu_id;
75 uint64_t rseq_cs;
76 uint32_t flags;
77 } __attribute__((aligned(4 * sizeof(uint64_t))));
78
79 int
linux_rseq(struct thread * td,struct linux_rseq_args * args)80 linux_rseq(struct thread *td, struct linux_rseq_args *args)
81 {
82
83 return (ENOSYS);
84 }
85