Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2/*
3 * mm definition for NOLIBC
4 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
5 */
6
7/* make sure to include all global symbols */
8#include "../nolibc.h"
9
10#ifndef _NOLIBC_SYS_MMAN_H
11#define _NOLIBC_SYS_MMAN_H
12
13#include "../arch.h"
14#include "../sys.h"
15
16#ifndef sys_mmap
17static __attribute__((unused))
18void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
19 off_t offset)
20{
21 int n;
22
23#if defined(__NR_mmap2)
24 n = __NR_mmap2;
25 offset >>= 12;
26#else
27 n = __NR_mmap;
28#endif
29
30 return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
31}
32#endif
33
34static __attribute__((unused))
35void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
36{
37 void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
38
39 if ((unsigned long)ret >= -4095UL) {
40 SET_ERRNO(-(long)ret);
41 ret = MAP_FAILED;
42 }
43 return ret;
44}
45
46static __attribute__((unused))
47void *sys_mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
48{
49 return (void *)my_syscall5(__NR_mremap, old_address, old_size,
50 new_size, flags, new_address);
51}
52
53static __attribute__((unused))
54void *mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
55{
56 void *ret = sys_mremap(old_address, old_size, new_size, flags, new_address);
57
58 if ((unsigned long)ret >= -4095UL) {
59 SET_ERRNO(-(long)ret);
60 ret = MAP_FAILED;
61 }
62 return ret;
63}
64
65static __attribute__((unused))
66int sys_munmap(void *addr, size_t length)
67{
68 return my_syscall2(__NR_munmap, addr, length);
69}
70
71static __attribute__((unused))
72int munmap(void *addr, size_t length)
73{
74 return __sysret(sys_munmap(addr, length));
75}
76
77#endif /* _NOLIBC_SYS_MMAN_H */