1 /* $NetBSD: netbsd32_futex.c,v 1.1 2020/04/26 18:53:33 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2019 The NetBSD Foundation.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell and Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: netbsd32_futex.c,v 1.1 2020/04/26 18:53:33 thorpej Exp $");
34
35 #include <sys/types.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/proc.h>
39 #include <sys/lwp.h>
40 #include <sys/syscallargs.h>
41 #include <sys/futex.h>
42
43 #include <compat/netbsd32/netbsd32.h>
44 #include <compat/netbsd32/netbsd32_syscallargs.h>
45 #include <compat/netbsd32/netbsd32_conv.h>
46
47 /* Sycalls conversion */
48
49 int
netbsd32___futex(struct lwp * l,const struct netbsd32___futex_args * uap,register_t * retval)50 netbsd32___futex(struct lwp *l, const struct netbsd32___futex_args *uap,
51 register_t *retval)
52 {
53 /* {
54 syscallarg(netbsd32_intp) uaddr;
55 syscallarg(int) op;
56 syscallarg(int) val;
57 syscallarg(netbsd32_timespecp_t) timeout;
58 syscallarg(netbsd32_intp) uaddr2;
59 syscallarg(int) val2;
60 syscallarg(int) val3;
61 } */
62 struct netbsd32_timespec ts32;
63 struct timespec ts, *tsp;
64 int error;
65
66 /*
67 * Copy in the timeout argument, if specified.
68 */
69 if (SCARG_P32(uap, timeout)) {
70 error = copyin(SCARG_P32(uap, timeout), &ts32, sizeof(ts32));
71 if (error)
72 return error;
73 netbsd32_to_timespec(&ts32, &ts);
74 tsp = &ts;
75 } else {
76 tsp = NULL;
77 }
78
79 return do_futex(SCARG_P32(uap, uaddr), SCARG(uap, op),
80 SCARG(uap, val), tsp, SCARG_P32(uap, uaddr2), SCARG(uap, val2),
81 SCARG(uap, val3), retval);
82 }
83
84 int
netbsd32___futex_set_robust_list(struct lwp * l,const struct netbsd32___futex_set_robust_list_args * uap,register_t * retval)85 netbsd32___futex_set_robust_list(struct lwp *l,
86 const struct netbsd32___futex_set_robust_list_args *uap, register_t *retval)
87 {
88 /* {
89 syscallarg(netbsd32_voidp) head;
90 syscallarg(netbsd32_size_t) len;
91 } */
92 void *head = SCARG_P32(uap, head);
93
94 if (SCARG(uap, len) != _FUTEX_ROBUST_HEAD_SIZE32)
95 return EINVAL;
96 if ((uintptr_t)head % sizeof(uint32_t))
97 return EINVAL;
98
99 l->l_robust_head = (uintptr_t)head;
100
101 return 0;
102 }
103
104 int
netbsd32___futex_get_robust_list(struct lwp * l,const struct netbsd32___futex_get_robust_list_args * uap,register_t * retval)105 netbsd32___futex_get_robust_list(struct lwp *l,
106 const struct netbsd32___futex_get_robust_list_args *uap, register_t *retval)
107 {
108 /* {
109 syscallarg(lwpid_t) lwpid;
110 syscallarg(netbsd32_voidp) headp;
111 syscallarg(netbsd32_size_tp) lenp;
112 } */
113 void *head;
114 const netbsd32_size_t len = _FUTEX_ROBUST_HEAD_SIZE32;
115 netbsd32_voidp head32;
116 int error;
117
118 error = futex_robust_head_lookup(l, SCARG(uap, lwpid), &head);
119 if (error)
120 return error;
121
122 head32.i32 = (uintptr_t)head;
123 if (NETBSD32PTR64(head32) != head)
124 return EFAULT;
125
126 /* Copy out the head pointer and the head structure length. */
127 /* (N.B.: "headp" is actually a "void **". */
128 error = copyout(&head32, SCARG_P32(uap, headp), sizeof(head32));
129 if (__predict_true(error == 0)) {
130 error = copyout(&len, SCARG_P32(uap, lenp), sizeof(len));
131 }
132
133 return error;
134 }
135