4 * Copyright (C) 2013 JP Ikaheimonen <jp_ikaheimonen@mentor.com>
5 * 2016 Michael Jeanson <mjeanson@efficios.com>
7 * These sources are based on ftp://g.oswego.edu/pub/misc/malloc.c
8 * file by Doug Lea, released to the public domain.
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 #define BT_LOG_TAG "COMPAT-MMAN"
32 #include "common/macros.h"
36 * On macOS, we need a dummy symbol so that the linker won't
37 * complain of an empty table of contents.
40 int bt_mman_dummy_symbol
;
41 #endif /* __APPLE__ */
50 #include "compat/mman.h"
53 /* The duplicated handle. */
55 /* Handle returned by CreateFileMapping. */
60 GHashTable
*mmap_mappings
= NULL
;
63 * This mutex protects the hashtable of memory mappings.
65 static pthread_mutex_t mmap_mutex
= PTHREAD_MUTEX_INITIALIZER
;
68 struct mmap_mapping
*mapping_create(void)
70 struct mmap_mapping
*mapping
;
72 mapping
= malloc(sizeof(struct mmap_mapping
));
73 if (mapping
!= NULL
) {
74 mapping
->file_handle
= NULL
;
75 mapping
->map_handle
= NULL
;
82 void mapping_clean(struct mmap_mapping
*mapping
)
85 if (!CloseHandle(mapping
->map_handle
)) {
86 BT_LOGF_STR("Failed to close mmap map_handle.");
89 if (!CloseHandle(mapping
->file_handle
)) {
90 BT_LOGF_STR("Failed to close mmap file_handle.");
99 void addr_clean(void *addr
)
101 /* Cleanup of handles should never fail. */
102 if (!UnmapViewOfFile(addr
)) {
103 BT_LOGF_STR("Failed to unmap mmap mapping.");
111 if (pthread_mutex_lock(&mmap_mutex
)) {
112 BT_LOGF_STR("Failed to acquire mmap_mutex.");
118 void mmap_unlock(void)
120 if (pthread_mutex_unlock(&mmap_mutex
)) {
121 BT_LOGF_STR("Failed to release mmap_mutex.");
127 * Convert mmap memory protection flags to CreateFileMapping page protection
128 * flag and MapViewOfFile desired access flag.
131 DWORD
map_prot_flags(int prot
, DWORD
*dwDesiredAccess
)
133 if (prot
& PROT_READ
) {
134 if (prot
& PROT_WRITE
) {
135 *dwDesiredAccess
= FILE_MAP_WRITE
;
136 if (prot
& PROT_EXEC
) {
137 return PAGE_EXECUTE_READWRITE
;
139 return PAGE_READWRITE
;
141 if (prot
& PROT_EXEC
) {
142 *dwDesiredAccess
= FILE_MAP_EXECUTE
;
143 return PAGE_EXECUTE_READ
;
145 *dwDesiredAccess
= FILE_MAP_READ
;
146 return PAGE_READONLY
;
148 if (prot
& PROT_WRITE
) {
149 *dwDesiredAccess
= FILE_MAP_COPY
;
150 return PAGE_WRITECOPY
;
152 if (prot
& PROT_EXEC
) {
153 *dwDesiredAccess
= FILE_MAP_EXECUTE
;
154 return PAGE_EXECUTE_READ
;
157 /* Mapping failed. */
158 *dwDesiredAccess
= 0;
163 void *bt_mmap(void *addr
, size_t length
, int prot
, int flags
, int fd
,
166 struct mmap_mapping
*mapping
= NULL
;
168 DWORD dwDesiredAccess
;
172 /* Check for a valid fd. */
178 /* We don't support this at the moment. */
179 if (flags
== MAP_FIXED
) {
184 /* Map mmap flags to those of the Windows API. */
185 flProtect
= map_prot_flags(prot
, &dwDesiredAccess
);
186 if (flProtect
== 0) {
191 /* Allocate the mapping struct. */
192 mapping
= mapping_create();
194 BT_LOGE_STR("Failed to allocate mmap mapping.");
199 /* Get a handle from the fd. */
200 handle
= (HANDLE
) _get_osfhandle(fd
);
202 /* Duplicate the handle and store it in 'mapping.file_handle'. */
203 if (!DuplicateHandle(GetCurrentProcess(), handle
, GetCurrentProcess(),
204 &mapping
->file_handle
, 0, FALSE
,
205 DUPLICATE_SAME_ACCESS
)) {
211 * Create a file mapping object with a maximum size
212 * of 'offset' + 'length'.
214 mapping
->map_handle
= CreateFileMapping(mapping
->file_handle
, NULL
,
215 flProtect
, 0, offset
+ length
, NULL
);
216 if (mapping
->map_handle
== 0) {
221 /* Map the requested block starting at 'offset' for 'length' bytes. */
222 mapping_addr
= MapViewOfFile(mapping
->map_handle
, dwDesiredAccess
, 0,
224 if (mapping_addr
== 0) {
225 DWORD dwLastErr
= GetLastError();
226 if (dwLastErr
== ERROR_MAPPED_ALIGNMENT
) {
236 /* If we have never done any mappings, allocate the hashtable. */
237 if (!mmap_mappings
) {
238 mmap_mappings
= g_hash_table_new_full(g_direct_hash
,
239 g_direct_equal
, (GDestroyNotify
) addr_clean
,
240 (GDestroyNotify
) mapping_clean
);
241 if (!mmap_mappings
) {
242 BT_LOGE_STR("Failed to allocate mmap hashtable.");
244 goto error_mutex_unlock
;
248 /* Add the new mapping to the hashtable. */
249 g_hash_table_insert(mmap_mappings
, mapping_addr
, mapping
);
258 mapping_clean(mapping
);
263 int bt_munmap(void *addr
, size_t length
)
269 /* Check if the mapping exists in the hashtable. */
270 if (g_hash_table_lookup(mmap_mappings
, addr
) == NULL
) {
277 if (!g_hash_table_remove(mmap_mappings
, addr
)) {
278 BT_LOGF_STR("Failed to remove mapping from hashtable.");