cloudabi_mem.c revision 316574 
1/*-
2 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: stable/11/sys/compat/cloudabi/cloudabi_mem.c 316574 2017-04-06 15:10:36Z ed $");
28
29#include <sys/param.h>
30#include <sys/mman.h>
31#include <sys/proc.h>
32#include <sys/syscallsubr.h>
33
34#include <contrib/cloudabi/cloudabi_types_common.h>
35
36#include <compat/cloudabi/cloudabi_proto.h>
37
38/* Converts CloudABI's memory protection flags to FreeBSD's. */
39static int
40convert_mprot(cloudabi_mprot_t in, int *out)
41{
42
43	/* Unknown protection flags. */
44	if ((in & ~(CLOUDABI_PROT_EXEC | CLOUDABI_PROT_WRITE |
45	    CLOUDABI_PROT_READ)) != 0)
46		return (ENOTSUP);
47	/* W^X: Write and exec cannot be enabled at the same time. */
48	if ((in & (CLOUDABI_PROT_EXEC | CLOUDABI_PROT_WRITE)) ==
49	    (CLOUDABI_PROT_EXEC | CLOUDABI_PROT_WRITE))
50		return (ENOTSUP);
51
52	*out = 0;
53	if (in & CLOUDABI_PROT_EXEC)
54		*out |= PROT_EXEC;
55	if (in & CLOUDABI_PROT_WRITE)
56		*out |= PROT_WRITE;
57	if (in & CLOUDABI_PROT_READ)
58		*out |= PROT_READ;
59	return (0);
60}
61
62int
63cloudabi_sys_mem_advise(struct thread *td,
64    struct cloudabi_sys_mem_advise_args *uap)
65{
66	int behav;
67
68	switch (uap->advice) {
69	case CLOUDABI_ADVICE_DONTNEED:
70		behav = MADV_DONTNEED;
71		break;
72	case CLOUDABI_ADVICE_NORMAL:
73		behav = MADV_NORMAL;
74		break;
75	case CLOUDABI_ADVICE_RANDOM:
76		behav = MADV_RANDOM;
77		break;
78	case CLOUDABI_ADVICE_SEQUENTIAL:
79		behav = MADV_SEQUENTIAL;
80		break;
81	case CLOUDABI_ADVICE_WILLNEED:
82		behav = MADV_WILLNEED;
83		break;
84	default:
85		return (EINVAL);
86	}
87
88	return (kern_madvise(td, (uintptr_t)uap->mapping, uap->mapping_len,
89	    behav));
90}
91
92int
93cloudabi_sys_mem_lock(struct thread *td, struct cloudabi_sys_mem_lock_args *uap)
94{
95
96	return (kern_mlock(td->td_proc, td->td_ucred,
97	    __DECONST(uintptr_t, uap->mapping), uap->mapping_len));
98}
99
100int
101cloudabi_sys_mem_map(struct thread *td, struct cloudabi_sys_mem_map_args *uap)
102{
103	int error, flags, prot;
104
105	/* Translate flags. */
106	flags = 0;
107	if (uap->flags & CLOUDABI_MAP_ANON)
108		flags |= MAP_ANON;
109	if (uap->flags & CLOUDABI_MAP_FIXED)
110		flags |= MAP_FIXED;
111	if (uap->flags & CLOUDABI_MAP_PRIVATE)
112		flags |= MAP_PRIVATE;
113	if (uap->flags & CLOUDABI_MAP_SHARED)
114		flags |= MAP_SHARED;
115
116	/* Translate protection. */
117	error = convert_mprot(uap->prot, &prot);
118	if (error != 0)
119		return (error);
120
121	return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, prot, flags,
122	    uap->fd, uap->off));
123}
124
125int
126cloudabi_sys_mem_protect(struct thread *td,
127    struct cloudabi_sys_mem_protect_args *uap)
128{
129	int error, prot;
130
131	/* Translate protection. */
132	error = convert_mprot(uap->prot, &prot);
133	if (error != 0)
134		return (error);
135
136	return (kern_mprotect(td, (uintptr_t)uap->mapping, uap->mapping_len,
137	    prot));
138}
139
140int
141cloudabi_sys_mem_sync(struct thread *td, struct cloudabi_sys_mem_sync_args *uap)
142{
143	int flags;
144
145	/* Convert flags. */
146	switch (uap->flags & (CLOUDABI_MS_ASYNC | CLOUDABI_MS_SYNC)) {
147	case CLOUDABI_MS_ASYNC:
148		flags = MS_ASYNC;
149		break;
150	case CLOUDABI_MS_SYNC:
151		flags = MS_SYNC;
152		break;
153	default:
154		return (EINVAL);
155	}
156	if ((uap->flags & CLOUDABI_MS_INVALIDATE) != 0)
157		flags |= MS_INVALIDATE;
158
159	return (kern_msync(td, (uintptr_t)uap->mapping, uap->mapping_len,
160	    flags));
161}
162
163int
164cloudabi_sys_mem_unlock(struct thread *td,
165    struct cloudabi_sys_mem_unlock_args *uap)
166{
167
168	return (kern_munlock(td, __DECONST(uintptr_t, uap->mapping),
169	    uap->mapping_len));
170}
171
172int
173cloudabi_sys_mem_unmap(struct thread *td,
174    struct cloudabi_sys_mem_unmap_args *uap)
175{
176
177	return (kern_munmap(td, (uintptr_t)uap->mapping, uap->mapping_len));
178}
179