1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* Massivly hacked up for uClibc by Erik Andersen */
#include <_lfs_64.h>
#ifdef __UCLIBC_HAS_LFS__
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <bits/uClibc_page.h>
# if !defined __NR_mmap2
/*
* This version is a stub that just chops off everything at the mmap 32 bit
* mmap() address space... You will probably need to add in an arch specific
* implementation to override this as there is not a generic way for me to
* implement this particular syscall if your arch lacks _syscall6...
*
*/
__ptr_t mmap64(__ptr_t addr, size_t len, int prot, int flags, int fd, __off64_t offset)
{
if (offset != (off_t) offset ||
(offset + len) != (off_t) (offset + len)) {
__set_errno(EINVAL);
return MAP_FAILED;
}
return mmap(addr, len, prot, flags, fd, (off_t) offset);
}
# else
# define __NR___syscall_mmap2 __NR_mmap2
static __inline__ _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr,
size_t, len, int, prot, int, flags, int, fd,
off_t, offset)
/* Some architectures always use 12 as page shift for mmap2() eventhough the
* real PAGE_SHIFT != 12. Other architectures use the same value as
* PAGE_SHIFT...
*/
# ifndef MMAP2_PAGE_SHIFT
# define MMAP2_PAGE_SHIFT 12
# endif
__ptr_t mmap64(__ptr_t addr, size_t len, int prot, int flags, int fd, __off64_t offset)
{
if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) {
__set_errno(EINVAL);
return MAP_FAILED;
}
/*
* We know __off64_t is always a signed 64-bit type, but need things
* to be unsigned before doing the shift. If it isn't, we might
* sign extend things and pass in the wrong value. So cast it to
* an unsigned 64-bit value before doing the shift.
*/
return __syscall_mmap2(addr, len, prot, flags, fd,
((uint64_t)offset >> MMAP2_PAGE_SHIFT));
}
# endif
#endif /* __UCLIBC_HAS_LFS__ */
|
