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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* BFD library -- mmap of file descriptors.
Copyright (C) 2016 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#ifdef HAVE_MMAP
#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"
#include "bfd_stdint.h"
#include <sys/mman.h>
static file_ptr
mmap_btell (struct bfd *abfd)
{
return abfd->where;
}
/* Copied and modified from gold_fallocate in gold. */
static int
mmap_fallocate (int fd, file_ptr offset, file_ptr len)
{
#ifdef HAVE_FALLOCATE
if (fallocate (fd, 0, offset, len) == 0)
return 0;
#endif
#ifdef HAVE_POSIX_FALLOCATE
return posix_fallocate (fd, offset, len);
#endif
if (ftruncate (fd, offset + len) < 0)
return errno;
return 0;
}
static int
mmap_resize (bfd *abfd, file_ptr size)
{
if (mmap_fallocate (abfd->mmap_fd, 0, size) != 0)
{
syscall_error:
bfd_set_error (bfd_error_system_call);
abfd->mmap_size = 0;
return -1;
}
if (abfd->mmap_size != 0)
{
#ifdef HAVE_MREMAP
abfd->iostream = mremap (abfd->iostream, abfd->mmap_size,
size, MREMAP_MAYMOVE);
if (abfd->iostream == MAP_FAILED)
goto syscall_error;
else
goto success;
#else
if (munmap (abfd->iostream, abfd->mmap_size) != 0)
goto syscall_error;
#endif
}
abfd->iostream = mmap (NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED, abfd->mmap_fd, 0);
if (abfd->iostream == MAP_FAILED)
goto syscall_error;
success:
abfd->mmap_size = size;
return 0;
}
static int
mmap_bseek (bfd *abfd, file_ptr position, int direction)
{
file_ptr nwhere;
if (direction == SEEK_SET)
nwhere = position;
else
nwhere = abfd->where + position;
if (nwhere < 0)
{
abfd->where = 0;
errno = EINVAL;
return -1;
}
else if (nwhere >= abfd->mmap_size && mmap_resize (abfd, nwhere) != 0)
return -1;
return 0;
}
static file_ptr
mmap_bread (struct bfd *abfd, void *buf, file_ptr size)
{
memcpy (buf, abfd->iostream + abfd->where, size);
return size;
}
static file_ptr
mmap_bwrite (bfd *abfd, const void *ptr, file_ptr size)
{
file_ptr filesize = abfd->where + size;
if (filesize > abfd->mmap_size && mmap_resize (abfd, filesize) != 0)
{
bfd_set_error (bfd_error_system_call);
return 0;
}
memcpy (abfd->iostream + abfd->where, ptr, size);
return size;
}
static int
mmap_bclose (struct bfd *abfd)
{
int status = munmap (abfd->iostream, abfd->mmap_size);
if (status == 0)
status = close (abfd->mmap_fd);
if (status != 0)
bfd_set_error (bfd_error_system_call);
abfd->iostream = MAP_FAILED;
abfd->mmap_size = 0;
abfd->mmap_fd = -1;
return status;
}
static int
mmap_bflush (struct bfd *abfd ATTRIBUTE_UNUSED)
{
#ifdef HAVE_MSYNC
int status = msync (abfd->iostream, abfd->mmap_size, MS_SYNC);
if (status != 0)
bfd_set_error (bfd_error_system_call);
return status;
#else
return 0;
#endif
}
static int
mmap_bstat (struct bfd *abfd ATTRIBUTE_UNUSED, struct stat *sb)
{
int status;
status = fstat (abfd->mmap_fd, sb);
if (status < 0)
bfd_set_error (bfd_error_system_call);
return status;
}
static void *
mmap_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
void *addr ATTRIBUTE_UNUSED,
bfd_size_type len ATTRIBUTE_UNUSED,
int prot ATTRIBUTE_UNUSED,
int flags ATTRIBUTE_UNUSED,
file_ptr offset ATTRIBUTE_UNUSED,
void **map_addr ATTRIBUTE_UNUSED,
bfd_size_type *map_len ATTRIBUTE_UNUSED)
{
/* Unsupported. */
abort ();
return 0;
}
static const struct bfd_iovec mmap_iovec =
{
&mmap_bread, &mmap_bwrite, &mmap_btell, &mmap_bseek,
&mmap_bclose, &mmap_bflush, &mmap_bstat, &mmap_bmmap
};
#endif
/*
INTERNAL_FUNCTION
bfd_mmap_init
SYNOPSIS
bfd_boolean bfd_mmap_init (bfd *abfd);
DESCRIPTION
Use mmap on BFD. Fallback to bfd_cache_init.
*/
bfd_boolean
bfd_mmap_init (bfd *abfd)
{
#ifdef HAVE_MMAP
/* Only suport write before writing starts. */
if (abfd->direction == write_direction
&& !abfd->output_has_begun)
{
if (abfd->mmap_size != 0 || abfd->iostream == NULL)
abort ();
abfd->mmap_fd = dup (fileno (abfd->iostream));
if (abfd->mmap_fd < 0)
{
bfd_set_error (bfd_error_system_call);
return FALSE;
}
abfd->iovec = &mmap_iovec;
return TRUE;
}
#endif
return bfd_cache_init (abfd);
}
|
