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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <Kernel/Syscall.h>
28#include <errno.h>
29#include <sys/mman.h>
30#include <stdio.h>
31#include <string.h>
32
33extern "C" {
34
35#ifdef __serenity__
36void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset)
37{
38 return mmap_with_name(addr, size, prot, flags, fd, offset, nullptr);
39}
40
41int munmap(void* addr, size_t size)
42{
43 int rc = syscall(SC_munmap, addr, size);
44 __RETURN_WITH_ERRNO(rc, rc, -1);
45}
46
47int mprotect(void* addr, size_t size, int prot)
48{
49 int rc = syscall(SC_mprotect, addr, size, prot);
50 __RETURN_WITH_ERRNO(rc, rc, -1);
51}
52
53int madvise(void* address, size_t size, int advice)
54{
55 int rc = syscall(SC_madvise, address, size, advice);
56 __RETURN_WITH_ERRNO(rc, rc, -1);
57}
58#endif
59
60void* mmap_with_name(void* addr, size_t size, int prot, int flags, int fd, off_t offset, const char* name)
61{
62#ifdef __serenity__
63 Syscall::SC_mmap_params params { (u32)addr, size, prot, flags, fd, offset, { name, name ? strlen(name) : 0 } };
64 int rc = syscall(SC_mmap, ¶ms);
65 if (rc < 0 && -rc < EMAXERRNO) {
66 errno = -rc;
67 return MAP_FAILED;
68 }
69 return (void*)rc;
70#else
71 (void)name;
72 // XXX: purgeable memory not supported, turn it into an anonymous mapping
73 if (flags & MAP_PURGEABLE)
74 flags = (flags & ~MAP_PURGEABLE) | MAP_ANONYMOUS;
75 // Using fd 0 seems like a bug, and should be -1 or mmap will EINVAL
76 if (fd == 0 && (flags & MAP_ANONYMOUS))
77 fd = -1;
78 return mmap(addr, size, prot, flags, fd, offset);
79#endif
80}
81
82int set_mmap_name(void* addr, size_t size, const char* name)
83{
84#ifdef __serenity__
85 if (!name) {
86 errno = EFAULT;
87 return -1;
88 }
89 Syscall::SC_set_mmap_name_params params { addr, size, { name, strlen(name) } };
90 int rc = syscall(SC_set_mmap_name, ¶ms);
91 __RETURN_WITH_ERRNO(rc, rc, -1);
92#else
93 (void)name;
94 (void)addr;
95 (void)size;
96 return 0;
97#endif
98}
99}