root / darwin-user / mmap.c @ 36bb244b
History | View | Annotate | Download (12.9 kB)
1 | 831b7825 | ths | /*
|
---|---|---|---|
2 | 831b7825 | ths | * mmap support for qemu
|
3 | 831b7825 | ths | *
|
4 | 831b7825 | ths | * Copyright (c) 2003 Fabrice Bellard
|
5 | 831b7825 | ths | *
|
6 | 831b7825 | ths | * This program is free software; you can redistribute it and/or modify
|
7 | 831b7825 | ths | * it under the terms of the GNU General Public License as published by
|
8 | 831b7825 | ths | * the Free Software Foundation; either version 2 of the License, or
|
9 | 831b7825 | ths | * (at your option) any later version.
|
10 | 831b7825 | ths | *
|
11 | 831b7825 | ths | * This program is distributed in the hope that it will be useful,
|
12 | 831b7825 | ths | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 | 831b7825 | ths | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
14 | 831b7825 | ths | * GNU General Public License for more details.
|
15 | 831b7825 | ths | *
|
16 | 831b7825 | ths | * You should have received a copy of the GNU General Public License
|
17 | 831b7825 | ths | * along with this program; if not, write to the Free Software
|
18 | 831b7825 | ths | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
19 | 831b7825 | ths | */
|
20 | 831b7825 | ths | #include <stdlib.h> |
21 | 831b7825 | ths | #include <stdio.h> |
22 | 831b7825 | ths | #include <stdarg.h> |
23 | 831b7825 | ths | #include <string.h> |
24 | 831b7825 | ths | #include <unistd.h> |
25 | 831b7825 | ths | #include <errno.h> |
26 | 831b7825 | ths | #include <sys/mman.h> |
27 | 831b7825 | ths | |
28 | 831b7825 | ths | #include "qemu.h" |
29 | 831b7825 | ths | |
30 | 831b7825 | ths | //#define DEBUG_MMAP
|
31 | 831b7825 | ths | |
32 | 831b7825 | ths | /* NOTE: all the constants are the HOST ones */
|
33 | 831b7825 | ths | int target_mprotect(unsigned long start, unsigned long len, int prot) |
34 | 831b7825 | ths | { |
35 | 831b7825 | ths | unsigned long end, host_start, host_end, addr; |
36 | 831b7825 | ths | int prot1, ret;
|
37 | 831b7825 | ths | |
38 | 831b7825 | ths | #ifdef DEBUG_MMAP
|
39 | 831b7825 | ths | printf("mprotect: start=0x%lx len=0x%lx prot=%c%c%c\n", start, len,
|
40 | 831b7825 | ths | prot & PROT_READ ? 'r' : '-', |
41 | 831b7825 | ths | prot & PROT_WRITE ? 'w' : '-', |
42 | 831b7825 | ths | prot & PROT_EXEC ? 'x' : '-'); |
43 | 831b7825 | ths | #endif
|
44 | 831b7825 | ths | |
45 | 831b7825 | ths | if ((start & ~TARGET_PAGE_MASK) != 0) |
46 | 831b7825 | ths | return -EINVAL;
|
47 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
48 | 831b7825 | ths | end = start + len; |
49 | 831b7825 | ths | if (end < start)
|
50 | 831b7825 | ths | return -EINVAL;
|
51 | 831b7825 | ths | if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
|
52 | 831b7825 | ths | return -EINVAL;
|
53 | 831b7825 | ths | if (len == 0) |
54 | 831b7825 | ths | return 0; |
55 | 831b7825 | ths | |
56 | 831b7825 | ths | host_start = start & qemu_host_page_mask; |
57 | 831b7825 | ths | host_end = HOST_PAGE_ALIGN(end); |
58 | 831b7825 | ths | if (start > host_start) {
|
59 | 831b7825 | ths | /* handle host page containing start */
|
60 | 831b7825 | ths | prot1 = prot; |
61 | 831b7825 | ths | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
62 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
63 | 831b7825 | ths | } |
64 | 831b7825 | ths | if (host_end == host_start + qemu_host_page_size) {
|
65 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
|
66 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
67 | 831b7825 | ths | } |
68 | 831b7825 | ths | end = host_end; |
69 | 831b7825 | ths | } |
70 | 831b7825 | ths | ret = mprotect((void *)host_start, qemu_host_page_size, prot1 & PAGE_BITS);
|
71 | 831b7825 | ths | if (ret != 0) |
72 | 831b7825 | ths | return ret;
|
73 | 831b7825 | ths | host_start += qemu_host_page_size; |
74 | 831b7825 | ths | } |
75 | 831b7825 | ths | if (end < host_end) {
|
76 | 831b7825 | ths | prot1 = prot; |
77 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
|
78 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
79 | 831b7825 | ths | } |
80 | 831b7825 | ths | ret = mprotect((void *)(host_end - qemu_host_page_size), qemu_host_page_size,
|
81 | 831b7825 | ths | prot1 & PAGE_BITS); |
82 | 831b7825 | ths | if (ret != 0) |
83 | 831b7825 | ths | return ret;
|
84 | 831b7825 | ths | host_end -= qemu_host_page_size; |
85 | 831b7825 | ths | } |
86 | 831b7825 | ths | |
87 | 831b7825 | ths | /* handle the pages in the middle */
|
88 | 831b7825 | ths | if (host_start < host_end) {
|
89 | 831b7825 | ths | ret = mprotect((void *)host_start, host_end - host_start, prot);
|
90 | 831b7825 | ths | if (ret != 0) |
91 | 831b7825 | ths | return ret;
|
92 | 831b7825 | ths | } |
93 | 831b7825 | ths | page_set_flags(start, start + len, prot | PAGE_VALID); |
94 | 831b7825 | ths | return 0; |
95 | 831b7825 | ths | } |
96 | 831b7825 | ths | |
97 | 831b7825 | ths | /* map an incomplete host page */
|
98 | 831b7825 | ths | int mmap_frag(unsigned long host_start, |
99 | 831b7825 | ths | unsigned long start, unsigned long end, |
100 | 831b7825 | ths | int prot, int flags, int fd, unsigned long offset) |
101 | 831b7825 | ths | { |
102 | 831b7825 | ths | unsigned long host_end, ret, addr; |
103 | 831b7825 | ths | int prot1, prot_new;
|
104 | 831b7825 | ths | |
105 | 831b7825 | ths | host_end = host_start + qemu_host_page_size; |
106 | 831b7825 | ths | |
107 | 831b7825 | ths | /* get the protection of the target pages outside the mapping */
|
108 | 831b7825 | ths | prot1 = 0;
|
109 | 831b7825 | ths | for(addr = host_start; addr < host_end; addr++) {
|
110 | 831b7825 | ths | if (addr < start || addr >= end)
|
111 | 831b7825 | ths | prot1 |= page_get_flags(addr); |
112 | 831b7825 | ths | } |
113 | 831b7825 | ths | |
114 | 831b7825 | ths | if (prot1 == 0) { |
115 | 831b7825 | ths | /* no page was there, so we allocate one */
|
116 | 831b7825 | ths | ret = (long)mmap((void *)host_start, qemu_host_page_size, prot, |
117 | 831b7825 | ths | flags | MAP_ANONYMOUS, -1, 0); |
118 | 831b7825 | ths | if (ret == -1) |
119 | 831b7825 | ths | return ret;
|
120 | 831b7825 | ths | } |
121 | 831b7825 | ths | prot1 &= PAGE_BITS; |
122 | 831b7825 | ths | |
123 | 831b7825 | ths | prot_new = prot | prot1; |
124 | 831b7825 | ths | if (!(flags & MAP_ANONYMOUS)) {
|
125 | 831b7825 | ths | /* msync() won't work here, so we return an error if write is
|
126 | 831b7825 | ths | possible while it is a shared mapping */
|
127 | 831b7825 | ths | #ifndef __APPLE__
|
128 | 831b7825 | ths | if ((flags & MAP_TYPE) == MAP_SHARED &&
|
129 | 831b7825 | ths | #else
|
130 | 831b7825 | ths | if ((flags & MAP_SHARED) &&
|
131 | 831b7825 | ths | #endif
|
132 | 831b7825 | ths | (prot & PROT_WRITE)) |
133 | 831b7825 | ths | return -EINVAL;
|
134 | 831b7825 | ths | |
135 | 831b7825 | ths | /* adjust protection to be able to read */
|
136 | 831b7825 | ths | if (!(prot1 & PROT_WRITE))
|
137 | 831b7825 | ths | mprotect((void *)host_start, qemu_host_page_size, prot1 | PROT_WRITE);
|
138 | 831b7825 | ths | |
139 | 831b7825 | ths | /* read the corresponding file data */
|
140 | 831b7825 | ths | pread(fd, (void *)start, end - start, offset);
|
141 | 831b7825 | ths | |
142 | 831b7825 | ths | /* put final protection */
|
143 | 831b7825 | ths | if (prot_new != (prot1 | PROT_WRITE))
|
144 | 831b7825 | ths | mprotect((void *)host_start, qemu_host_page_size, prot_new);
|
145 | 831b7825 | ths | } else {
|
146 | 831b7825 | ths | /* just update the protection */
|
147 | 831b7825 | ths | if (prot_new != prot1) {
|
148 | 831b7825 | ths | mprotect((void *)host_start, qemu_host_page_size, prot_new);
|
149 | 831b7825 | ths | } |
150 | 831b7825 | ths | } |
151 | 831b7825 | ths | return 0; |
152 | 831b7825 | ths | } |
153 | 831b7825 | ths | |
154 | 831b7825 | ths | /* NOTE: all the constants are the HOST ones */
|
155 | 831b7825 | ths | long target_mmap(unsigned long start, unsigned long len, int prot, |
156 | 831b7825 | ths | int flags, int fd, unsigned long offset) |
157 | 831b7825 | ths | { |
158 | 831b7825 | ths | unsigned long ret, end, host_start, host_end, retaddr, host_offset, host_len; |
159 | 831b7825 | ths | #if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
|
160 | 831b7825 | ths | static unsigned long last_start = 0x40000000; |
161 | 831b7825 | ths | #endif
|
162 | 831b7825 | ths | |
163 | 831b7825 | ths | #ifdef DEBUG_MMAP
|
164 | 831b7825 | ths | { |
165 | 831b7825 | ths | printf("mmap: start=0x%lx len=0x%lx prot=%c%c%c flags=",
|
166 | 831b7825 | ths | start, len, |
167 | 831b7825 | ths | prot & PROT_READ ? 'r' : '-', |
168 | 831b7825 | ths | prot & PROT_WRITE ? 'w' : '-', |
169 | 831b7825 | ths | prot & PROT_EXEC ? 'x' : '-'); |
170 | 831b7825 | ths | if (flags & MAP_FIXED)
|
171 | 831b7825 | ths | printf("MAP_FIXED ");
|
172 | 831b7825 | ths | if (flags & MAP_ANONYMOUS)
|
173 | 831b7825 | ths | printf("MAP_ANON ");
|
174 | 831b7825 | ths | #ifndef MAP_TYPE
|
175 | 831b7825 | ths | # define MAP_TYPE 0x3 |
176 | 831b7825 | ths | #endif
|
177 | 831b7825 | ths | switch(flags & MAP_TYPE) {
|
178 | 831b7825 | ths | case MAP_PRIVATE:
|
179 | 831b7825 | ths | printf("MAP_PRIVATE ");
|
180 | 831b7825 | ths | break;
|
181 | 831b7825 | ths | case MAP_SHARED:
|
182 | 831b7825 | ths | printf("MAP_SHARED ");
|
183 | 831b7825 | ths | break;
|
184 | 831b7825 | ths | default:
|
185 | 831b7825 | ths | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
|
186 | 831b7825 | ths | break;
|
187 | 831b7825 | ths | } |
188 | 831b7825 | ths | printf("fd=%d offset=%lx\n", fd, offset);
|
189 | 831b7825 | ths | } |
190 | 831b7825 | ths | #endif
|
191 | 831b7825 | ths | |
192 | 831b7825 | ths | if (offset & ~TARGET_PAGE_MASK)
|
193 | 831b7825 | ths | return -EINVAL;
|
194 | 831b7825 | ths | |
195 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
196 | 831b7825 | ths | if (len == 0) |
197 | 831b7825 | ths | return start;
|
198 | 831b7825 | ths | host_start = start & qemu_host_page_mask; |
199 | 831b7825 | ths | |
200 | 831b7825 | ths | if (!(flags & MAP_FIXED)) {
|
201 | 831b7825 | ths | #if defined(__alpha__) || defined(__sparc__) || defined(__x86_64__)
|
202 | 831b7825 | ths | /* tell the kenel to search at the same place as i386 */
|
203 | 831b7825 | ths | if (host_start == 0) { |
204 | 831b7825 | ths | host_start = last_start; |
205 | 831b7825 | ths | last_start += HOST_PAGE_ALIGN(len); |
206 | 831b7825 | ths | } |
207 | 831b7825 | ths | #endif
|
208 | 831b7825 | ths | if (qemu_host_page_size != qemu_real_host_page_size) {
|
209 | 831b7825 | ths | /* NOTE: this code is only for debugging with '-p' option */
|
210 | 831b7825 | ths | /* reserve a memory area */
|
211 | 831b7825 | ths | host_len = HOST_PAGE_ALIGN(len) + qemu_host_page_size - TARGET_PAGE_SIZE; |
212 | 831b7825 | ths | host_start = (long)mmap((void *)host_start, host_len, PROT_NONE, |
213 | 831b7825 | ths | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
214 | 831b7825 | ths | if (host_start == -1) |
215 | 831b7825 | ths | return host_start;
|
216 | 831b7825 | ths | host_end = host_start + host_len; |
217 | 831b7825 | ths | start = HOST_PAGE_ALIGN(host_start); |
218 | 831b7825 | ths | end = start + HOST_PAGE_ALIGN(len); |
219 | 831b7825 | ths | if (start > host_start)
|
220 | 831b7825 | ths | munmap((void *)host_start, start - host_start);
|
221 | 831b7825 | ths | if (end < host_end)
|
222 | 831b7825 | ths | munmap((void *)end, host_end - end);
|
223 | 831b7825 | ths | /* use it as a fixed mapping */
|
224 | 831b7825 | ths | flags |= MAP_FIXED; |
225 | 831b7825 | ths | } else {
|
226 | 831b7825 | ths | /* if not fixed, no need to do anything */
|
227 | 831b7825 | ths | host_offset = offset & qemu_host_page_mask; |
228 | 831b7825 | ths | host_len = len + offset - host_offset; |
229 | 831b7825 | ths | start = (long)mmap((void *)host_start, host_len, |
230 | 831b7825 | ths | prot, flags, fd, host_offset); |
231 | 831b7825 | ths | if (start == -1) |
232 | 831b7825 | ths | return start;
|
233 | 831b7825 | ths | /* update start so that it points to the file position at 'offset' */
|
234 | 831b7825 | ths | if (!(flags & MAP_ANONYMOUS))
|
235 | 831b7825 | ths | start += offset - host_offset; |
236 | 831b7825 | ths | goto the_end1;
|
237 | 831b7825 | ths | } |
238 | 831b7825 | ths | } |
239 | 831b7825 | ths | |
240 | 831b7825 | ths | if (start & ~TARGET_PAGE_MASK)
|
241 | 831b7825 | ths | return -EINVAL;
|
242 | 831b7825 | ths | end = start + len; |
243 | 831b7825 | ths | host_end = HOST_PAGE_ALIGN(end); |
244 | 831b7825 | ths | |
245 | 831b7825 | ths | /* worst case: we cannot map the file because the offset is not
|
246 | 831b7825 | ths | aligned, so we read it */
|
247 | 831b7825 | ths | if (!(flags & MAP_ANONYMOUS) &&
|
248 | 831b7825 | ths | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { |
249 | 831b7825 | ths | /* msync() won't work here, so we return an error if write is
|
250 | 831b7825 | ths | possible while it is a shared mapping */
|
251 | 831b7825 | ths | #ifndef __APPLE__
|
252 | 831b7825 | ths | if ((flags & MAP_TYPE) == MAP_SHARED &&
|
253 | 831b7825 | ths | #else
|
254 | 831b7825 | ths | if ((flags & MAP_SHARED) &&
|
255 | 831b7825 | ths | #endif
|
256 | 831b7825 | ths | (prot & PROT_WRITE)) |
257 | 831b7825 | ths | return -EINVAL;
|
258 | 831b7825 | ths | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
259 | 831b7825 | ths | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, |
260 | 831b7825 | ths | -1, 0); |
261 | 831b7825 | ths | if (retaddr == -1) |
262 | 831b7825 | ths | return retaddr;
|
263 | 831b7825 | ths | pread(fd, (void *)start, len, offset);
|
264 | 831b7825 | ths | if (!(prot & PROT_WRITE)) {
|
265 | 831b7825 | ths | ret = target_mprotect(start, len, prot); |
266 | 831b7825 | ths | if (ret != 0) |
267 | 831b7825 | ths | return ret;
|
268 | 831b7825 | ths | } |
269 | 831b7825 | ths | goto the_end;
|
270 | 831b7825 | ths | } |
271 | 831b7825 | ths | |
272 | 831b7825 | ths | /* handle the start of the mapping */
|
273 | 831b7825 | ths | if (start > host_start) {
|
274 | 831b7825 | ths | if (host_end == host_start + qemu_host_page_size) {
|
275 | 831b7825 | ths | /* one single host page */
|
276 | 831b7825 | ths | ret = mmap_frag(host_start, start, end, |
277 | 831b7825 | ths | prot, flags, fd, offset); |
278 | 831b7825 | ths | if (ret == -1) |
279 | 831b7825 | ths | return ret;
|
280 | 831b7825 | ths | goto the_end1;
|
281 | 831b7825 | ths | } |
282 | 831b7825 | ths | ret = mmap_frag(host_start, start, host_start + qemu_host_page_size, |
283 | 831b7825 | ths | prot, flags, fd, offset); |
284 | 831b7825 | ths | if (ret == -1) |
285 | 831b7825 | ths | return ret;
|
286 | 831b7825 | ths | host_start += qemu_host_page_size; |
287 | 831b7825 | ths | } |
288 | 831b7825 | ths | /* handle the end of the mapping */
|
289 | 831b7825 | ths | if (end < host_end) {
|
290 | 831b7825 | ths | ret = mmap_frag(host_end - qemu_host_page_size, |
291 | 831b7825 | ths | host_end - qemu_host_page_size, host_end, |
292 | 831b7825 | ths | prot, flags, fd, |
293 | 831b7825 | ths | offset + host_end - qemu_host_page_size - start); |
294 | 831b7825 | ths | if (ret == -1) |
295 | 831b7825 | ths | return ret;
|
296 | 831b7825 | ths | host_end -= qemu_host_page_size; |
297 | 831b7825 | ths | } |
298 | 831b7825 | ths | |
299 | 831b7825 | ths | /* map the middle (easier) */
|
300 | 831b7825 | ths | if (host_start < host_end) {
|
301 | 831b7825 | ths | unsigned long offset1; |
302 | 831b7825 | ths | if (flags & MAP_ANONYMOUS)
|
303 | 831b7825 | ths | offset1 = 0;
|
304 | 831b7825 | ths | else
|
305 | 831b7825 | ths | offset1 = offset + host_start - start; |
306 | 831b7825 | ths | ret = (long)mmap((void *)host_start, host_end - host_start, |
307 | 831b7825 | ths | prot, flags, fd, offset1); |
308 | 831b7825 | ths | if (ret == -1) |
309 | 831b7825 | ths | return ret;
|
310 | 831b7825 | ths | } |
311 | 831b7825 | ths | the_end1:
|
312 | 831b7825 | ths | page_set_flags(start, start + len, prot | PAGE_VALID); |
313 | 831b7825 | ths | the_end:
|
314 | 831b7825 | ths | #ifdef DEBUG_MMAP
|
315 | 831b7825 | ths | printf("target_mmap: ret=0x%lx\n", (long)start); |
316 | 831b7825 | ths | page_dump(stdout); |
317 | 831b7825 | ths | printf("\n");
|
318 | 831b7825 | ths | #endif
|
319 | 831b7825 | ths | return start;
|
320 | 831b7825 | ths | } |
321 | 831b7825 | ths | |
322 | 831b7825 | ths | int target_munmap(unsigned long start, unsigned long len) |
323 | 831b7825 | ths | { |
324 | 831b7825 | ths | unsigned long end, host_start, host_end, addr; |
325 | 831b7825 | ths | int prot, ret;
|
326 | 831b7825 | ths | |
327 | 831b7825 | ths | #ifdef DEBUG_MMAP
|
328 | 831b7825 | ths | printf("munmap: start=0x%lx len=0x%lx\n", start, len);
|
329 | 831b7825 | ths | #endif
|
330 | 831b7825 | ths | if (start & ~TARGET_PAGE_MASK)
|
331 | 831b7825 | ths | return -EINVAL;
|
332 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
333 | 831b7825 | ths | if (len == 0) |
334 | 831b7825 | ths | return -EINVAL;
|
335 | 831b7825 | ths | end = start + len; |
336 | 831b7825 | ths | host_start = start & qemu_host_page_mask; |
337 | 831b7825 | ths | host_end = HOST_PAGE_ALIGN(end); |
338 | 831b7825 | ths | |
339 | 831b7825 | ths | if (start > host_start) {
|
340 | 831b7825 | ths | /* handle host page containing start */
|
341 | 831b7825 | ths | prot = 0;
|
342 | 831b7825 | ths | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
343 | 831b7825 | ths | prot |= page_get_flags(addr); |
344 | 831b7825 | ths | } |
345 | 831b7825 | ths | if (host_end == host_start + qemu_host_page_size) {
|
346 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
|
347 | 831b7825 | ths | prot |= page_get_flags(addr); |
348 | 831b7825 | ths | } |
349 | 831b7825 | ths | end = host_end; |
350 | 831b7825 | ths | } |
351 | 831b7825 | ths | if (prot != 0) |
352 | 831b7825 | ths | host_start += qemu_host_page_size; |
353 | 831b7825 | ths | } |
354 | 831b7825 | ths | if (end < host_end) {
|
355 | 831b7825 | ths | prot = 0;
|
356 | 831b7825 | ths | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
|
357 | 831b7825 | ths | prot |= page_get_flags(addr); |
358 | 831b7825 | ths | } |
359 | 831b7825 | ths | if (prot != 0) |
360 | 831b7825 | ths | host_end -= qemu_host_page_size; |
361 | 831b7825 | ths | } |
362 | 831b7825 | ths | |
363 | 831b7825 | ths | /* unmap what we can */
|
364 | 831b7825 | ths | if (host_start < host_end) {
|
365 | 831b7825 | ths | ret = munmap((void *)host_start, host_end - host_start);
|
366 | 831b7825 | ths | if (ret != 0) |
367 | 831b7825 | ths | return ret;
|
368 | 831b7825 | ths | } |
369 | 831b7825 | ths | |
370 | 831b7825 | ths | page_set_flags(start, start + len, 0);
|
371 | 831b7825 | ths | return 0; |
372 | 831b7825 | ths | } |
373 | 831b7825 | ths | |
374 | 831b7825 | ths | /* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED
|
375 | 831b7825 | ths | blocks which have been allocated starting on a host page */
|
376 | 831b7825 | ths | long target_mremap(unsigned long old_addr, unsigned long old_size, |
377 | 831b7825 | ths | unsigned long new_size, unsigned long flags, |
378 | 831b7825 | ths | unsigned long new_addr) |
379 | 831b7825 | ths | { |
380 | 831b7825 | ths | #ifndef __APPLE__
|
381 | 831b7825 | ths | /* XXX: use 5 args syscall */
|
382 | 831b7825 | ths | new_addr = (long)mremap((void *)old_addr, old_size, new_size, flags); |
383 | 831b7825 | ths | if (new_addr == -1) |
384 | 831b7825 | ths | return new_addr;
|
385 | 831b7825 | ths | prot = page_get_flags(old_addr); |
386 | 831b7825 | ths | page_set_flags(old_addr, old_addr + old_size, 0);
|
387 | 831b7825 | ths | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); |
388 | 831b7825 | ths | return new_addr;
|
389 | 831b7825 | ths | #else
|
390 | 831b7825 | ths | qerror("target_mremap: unsupported\n");
|
391 | 831b7825 | ths | #endif
|
392 | 831b7825 | ths | |
393 | 831b7825 | ths | } |
394 | 831b7825 | ths | |
395 | 831b7825 | ths | int target_msync(unsigned long start, unsigned long len, int flags) |
396 | 831b7825 | ths | { |
397 | 831b7825 | ths | unsigned long end; |
398 | 831b7825 | ths | |
399 | 831b7825 | ths | if (start & ~TARGET_PAGE_MASK)
|
400 | 831b7825 | ths | return -EINVAL;
|
401 | 831b7825 | ths | len = TARGET_PAGE_ALIGN(len); |
402 | 831b7825 | ths | end = start + len; |
403 | 831b7825 | ths | if (end < start)
|
404 | 831b7825 | ths | return -EINVAL;
|
405 | 831b7825 | ths | if (end == start)
|
406 | 831b7825 | ths | return 0; |
407 | 831b7825 | ths | |
408 | 831b7825 | ths | start &= qemu_host_page_mask; |
409 | 831b7825 | ths | return msync((void *)start, end - start, flags); |
410 | 831b7825 | ths | } |