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
|
/* Copyright (C) 1999-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 1999.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include <kernel-features.h>
/* This is always 12, even on architectures where PAGE_SHIFT != 12. */
#if MMAP2_PAGE_SHIFT == -1
static int page_shift;
#else
# ifndef MMAP2_PAGE_SHIFT
# define MMAP2_PAGE_SHIFT 12
# endif
#define page_shift MMAP2_PAGE_SHIFT
#endif
void *
__mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset)
{
#if MMAP2_PAGE_SHIFT == -1
if (page_shift == 0)
{
int page_size = getpagesize ();
while ((1 << ++page_shift) != page_size)
;
}
#endif
if (offset & ((1 << page_shift) - 1))
{
__set_errno (EINVAL);
return MAP_FAILED;
}
void *result;
__ptrvalue (result) = (void *__unbounded)
INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr),
len, prot, flags, fd,
(off_t) (offset >> MMAP2_PAGE_SHIFT));
#if __BOUNDED_POINTERS__
__ptrlow (result) = __ptrvalue (result);
__ptrhigh (result) = __ptrvalue (result) + len;
#endif
return result;
}
weak_alias (__mmap64, mmap64)
|
