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Commit | Line | Data |
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54936004 FB |
1 | /* |
2 | * mmap support for qemu | |
5fafdf24 | 3 | * |
54936004 FB |
4 | * Copyright (c) 2003 Fabrice Bellard |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | #include <stdlib.h> | |
21 | #include <stdio.h> | |
22 | #include <stdarg.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <sys/mman.h> | |
27 | ||
28 | #include "qemu.h" | |
78f5bf1e | 29 | #include "qemu-common.h" |
54936004 FB |
30 | |
31 | //#define DEBUG_MMAP | |
32 | ||
c8a706fe PB |
33 | #if defined(USE_NPTL) |
34 | pthread_mutex_t mmap_mutex; | |
35 | static int __thread mmap_lock_count; | |
36 | ||
37 | void mmap_lock(void) | |
38 | { | |
39 | if (mmap_lock_count++ == 0) { | |
40 | pthread_mutex_lock(&mmap_mutex); | |
41 | } | |
42 | } | |
43 | ||
44 | void mmap_unlock(void) | |
45 | { | |
46 | if (--mmap_lock_count == 0) { | |
47 | pthread_mutex_unlock(&mmap_mutex); | |
48 | } | |
49 | } | |
d5975363 PB |
50 | |
51 | /* Grab lock to make sure things are in a consistent state after fork(). */ | |
52 | void mmap_fork_start(void) | |
53 | { | |
54 | if (mmap_lock_count) | |
55 | abort(); | |
56 | pthread_mutex_lock(&mmap_mutex); | |
57 | } | |
58 | ||
59 | void mmap_fork_end(int child) | |
60 | { | |
61 | if (child) | |
62 | pthread_mutex_init(&mmap_mutex, NULL); | |
63 | else | |
64 | pthread_mutex_unlock(&mmap_mutex); | |
65 | } | |
c8a706fe PB |
66 | #else |
67 | /* We aren't threadsafe to start with, so no need to worry about locking. */ | |
68 | void mmap_lock(void) | |
69 | { | |
70 | } | |
71 | ||
72 | void mmap_unlock(void) | |
73 | { | |
74 | } | |
75 | #endif | |
76 | ||
17e2377a PB |
77 | void *qemu_vmalloc(size_t size) |
78 | { | |
79 | void *p; | |
80 | unsigned long addr; | |
81 | mmap_lock(); | |
82 | /* Use map and mark the pages as used. */ | |
83 | p = mmap(NULL, size, PROT_READ | PROT_WRITE, | |
84 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
85 | ||
86 | addr = (unsigned long)p; | |
87 | if (addr == (target_ulong) addr) { | |
88 | /* Allocated region overlaps guest address space. | |
89 | This may recurse. */ | |
90 | page_set_flags(addr & TARGET_PAGE_MASK, TARGET_PAGE_ALIGN(addr + size), | |
91 | PAGE_RESERVED); | |
92 | } | |
93 | ||
94 | mmap_unlock(); | |
95 | return p; | |
96 | } | |
97 | ||
98 | void *qemu_malloc(size_t size) | |
99 | { | |
100 | char * p; | |
101 | size += 16; | |
102 | p = qemu_vmalloc(size); | |
103 | *(size_t *)p = size; | |
104 | return p + 16; | |
105 | } | |
106 | ||
107 | /* We use map, which is always zero initialized. */ | |
108 | void * qemu_mallocz(size_t size) | |
109 | { | |
110 | return qemu_malloc(size); | |
111 | } | |
112 | ||
113 | void qemu_free(void *ptr) | |
114 | { | |
115 | /* FIXME: We should unmark the reserved pages here. However this gets | |
116 | complicated when one target page spans multiple host pages, so we | |
117 | don't bother. */ | |
118 | size_t *p; | |
119 | p = (size_t *)((char *)ptr - 16); | |
120 | munmap(p, *p); | |
121 | } | |
122 | ||
53a5960a | 123 | /* NOTE: all the constants are the HOST ones, but addresses are target. */ |
992f48a0 | 124 | int target_mprotect(abi_ulong start, abi_ulong len, int prot) |
54936004 | 125 | { |
992f48a0 | 126 | abi_ulong end, host_start, host_end, addr; |
54936004 FB |
127 | int prot1, ret; |
128 | ||
129 | #ifdef DEBUG_MMAP | |
a5b85f79 | 130 | printf("mprotect: start=0x" TARGET_FMT_lx |
80210bcd | 131 | "len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len, |
54936004 FB |
132 | prot & PROT_READ ? 'r' : '-', |
133 | prot & PROT_WRITE ? 'w' : '-', | |
134 | prot & PROT_EXEC ? 'x' : '-'); | |
135 | #endif | |
136 | ||
137 | if ((start & ~TARGET_PAGE_MASK) != 0) | |
138 | return -EINVAL; | |
139 | len = TARGET_PAGE_ALIGN(len); | |
140 | end = start + len; | |
141 | if (end < start) | |
142 | return -EINVAL; | |
171cd1cd | 143 | prot &= PROT_READ | PROT_WRITE | PROT_EXEC; |
54936004 FB |
144 | if (len == 0) |
145 | return 0; | |
3b46e624 | 146 | |
c8a706fe | 147 | mmap_lock(); |
83fb7adf | 148 | host_start = start & qemu_host_page_mask; |
54936004 FB |
149 | host_end = HOST_PAGE_ALIGN(end); |
150 | if (start > host_start) { | |
151 | /* handle host page containing start */ | |
152 | prot1 = prot; | |
153 | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) { | |
154 | prot1 |= page_get_flags(addr); | |
155 | } | |
83fb7adf | 156 | if (host_end == host_start + qemu_host_page_size) { |
d418c81e FB |
157 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { |
158 | prot1 |= page_get_flags(addr); | |
159 | } | |
160 | end = host_end; | |
161 | } | |
53a5960a | 162 | ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS); |
54936004 | 163 | if (ret != 0) |
c8a706fe | 164 | goto error; |
83fb7adf | 165 | host_start += qemu_host_page_size; |
54936004 FB |
166 | } |
167 | if (end < host_end) { | |
54936004 FB |
168 | prot1 = prot; |
169 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { | |
170 | prot1 |= page_get_flags(addr); | |
171 | } | |
5fafdf24 | 172 | ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size, |
54936004 FB |
173 | prot1 & PAGE_BITS); |
174 | if (ret != 0) | |
c8a706fe | 175 | goto error; |
83fb7adf | 176 | host_end -= qemu_host_page_size; |
54936004 | 177 | } |
3b46e624 | 178 | |
54936004 FB |
179 | /* handle the pages in the middle */ |
180 | if (host_start < host_end) { | |
53a5960a | 181 | ret = mprotect(g2h(host_start), host_end - host_start, prot); |
54936004 | 182 | if (ret != 0) |
c8a706fe | 183 | goto error; |
54936004 | 184 | } |
54936004 | 185 | page_set_flags(start, start + len, prot | PAGE_VALID); |
c8a706fe | 186 | mmap_unlock(); |
54936004 | 187 | return 0; |
c8a706fe PB |
188 | error: |
189 | mmap_unlock(); | |
190 | return ret; | |
54936004 FB |
191 | } |
192 | ||
193 | /* map an incomplete host page */ | |
992f48a0 BS |
194 | static int mmap_frag(abi_ulong real_start, |
195 | abi_ulong start, abi_ulong end, | |
196 | int prot, int flags, int fd, abi_ulong offset) | |
54936004 | 197 | { |
80210bcd | 198 | abi_ulong real_end, addr; |
53a5960a | 199 | void *host_start; |
54936004 FB |
200 | int prot1, prot_new; |
201 | ||
53a5960a PB |
202 | real_end = real_start + qemu_host_page_size; |
203 | host_start = g2h(real_start); | |
54936004 FB |
204 | |
205 | /* get the protection of the target pages outside the mapping */ | |
206 | prot1 = 0; | |
53a5960a | 207 | for(addr = real_start; addr < real_end; addr++) { |
54936004 FB |
208 | if (addr < start || addr >= end) |
209 | prot1 |= page_get_flags(addr); | |
210 | } | |
3b46e624 | 211 | |
54936004 FB |
212 | if (prot1 == 0) { |
213 | /* no page was there, so we allocate one */ | |
80210bcd TS |
214 | void *p = mmap(host_start, qemu_host_page_size, prot, |
215 | flags | MAP_ANONYMOUS, -1, 0); | |
216 | if (p == MAP_FAILED) | |
217 | return -1; | |
53a5960a | 218 | prot1 = prot; |
54936004 FB |
219 | } |
220 | prot1 &= PAGE_BITS; | |
221 | ||
222 | prot_new = prot | prot1; | |
223 | if (!(flags & MAP_ANONYMOUS)) { | |
224 | /* msync() won't work here, so we return an error if write is | |
225 | possible while it is a shared mapping */ | |
226 | if ((flags & MAP_TYPE) == MAP_SHARED && | |
227 | (prot & PROT_WRITE)) | |
228 | return -EINVAL; | |
229 | ||
230 | /* adjust protection to be able to read */ | |
231 | if (!(prot1 & PROT_WRITE)) | |
53a5960a | 232 | mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); |
3b46e624 | 233 | |
54936004 | 234 | /* read the corresponding file data */ |
53a5960a | 235 | pread(fd, g2h(start), end - start, offset); |
3b46e624 | 236 | |
54936004 FB |
237 | /* put final protection */ |
238 | if (prot_new != (prot1 | PROT_WRITE)) | |
53a5960a | 239 | mprotect(host_start, qemu_host_page_size, prot_new); |
54936004 FB |
240 | } else { |
241 | /* just update the protection */ | |
242 | if (prot_new != prot1) { | |
53a5960a | 243 | mprotect(host_start, qemu_host_page_size, prot_new); |
54936004 FB |
244 | } |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
a03e2d42 FB |
249 | #if defined(__CYGWIN__) |
250 | /* Cygwin doesn't have a whole lot of address space. */ | |
251 | static abi_ulong mmap_next_start = 0x18000000; | |
252 | #else | |
253 | static abi_ulong mmap_next_start = 0x40000000; | |
254 | #endif | |
255 | ||
0776590d PB |
256 | unsigned long last_brk; |
257 | ||
a03e2d42 FB |
258 | /* find a free memory area of size 'size'. The search starts at |
259 | 'start'. If 'start' == 0, then a default start address is used. | |
260 | Return -1 if error. | |
261 | */ | |
50a9569b | 262 | /* page_init() marks pages used by the host as reserved to be sure not |
a03e2d42 FB |
263 | to use them. */ |
264 | static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size) | |
265 | { | |
266 | abi_ulong addr, addr1, addr_start; | |
267 | int prot; | |
0776590d PB |
268 | unsigned long new_brk; |
269 | ||
270 | new_brk = (unsigned long)sbrk(0); | |
271 | if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) { | |
272 | /* This is a hack to catch the host allocating memory with brk(). | |
273 | If it uses mmap then we loose. | |
274 | FIXME: We really want to avoid the host allocating memory in | |
275 | the first place, and maybe leave some slack to avoid switching | |
276 | to mmap. */ | |
277 | page_set_flags(last_brk & TARGET_PAGE_MASK, | |
278 | TARGET_PAGE_ALIGN(new_brk), | |
279 | PAGE_RESERVED); | |
280 | } | |
281 | last_brk = new_brk; | |
a03e2d42 FB |
282 | |
283 | size = HOST_PAGE_ALIGN(size); | |
284 | start = start & qemu_host_page_mask; | |
285 | addr = start; | |
286 | if (addr == 0) | |
287 | addr = mmap_next_start; | |
288 | addr_start = addr; | |
289 | for(;;) { | |
290 | prot = 0; | |
291 | for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) { | |
292 | prot |= page_get_flags(addr1); | |
293 | } | |
294 | if (prot == 0) | |
295 | break; | |
296 | addr += qemu_host_page_size; | |
297 | /* we found nothing */ | |
298 | if (addr == addr_start) | |
299 | return (abi_ulong)-1; | |
300 | } | |
301 | if (start == 0) | |
302 | mmap_next_start = addr + size; | |
303 | return addr; | |
304 | } | |
305 | ||
54936004 | 306 | /* NOTE: all the constants are the HOST ones */ |
992f48a0 BS |
307 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, |
308 | int flags, int fd, abi_ulong offset) | |
54936004 | 309 | { |
992f48a0 | 310 | abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len; |
a5b85f79 | 311 | unsigned long host_start; |
54936004 | 312 | |
c8a706fe | 313 | mmap_lock(); |
54936004 FB |
314 | #ifdef DEBUG_MMAP |
315 | { | |
a5b85f79 | 316 | printf("mmap: start=0x" TARGET_FMT_lx |
80210bcd | 317 | " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=", |
5fafdf24 | 318 | start, len, |
54936004 FB |
319 | prot & PROT_READ ? 'r' : '-', |
320 | prot & PROT_WRITE ? 'w' : '-', | |
321 | prot & PROT_EXEC ? 'x' : '-'); | |
322 | if (flags & MAP_FIXED) | |
323 | printf("MAP_FIXED "); | |
324 | if (flags & MAP_ANONYMOUS) | |
325 | printf("MAP_ANON "); | |
326 | switch(flags & MAP_TYPE) { | |
327 | case MAP_PRIVATE: | |
328 | printf("MAP_PRIVATE "); | |
329 | break; | |
330 | case MAP_SHARED: | |
331 | printf("MAP_SHARED "); | |
332 | break; | |
333 | default: | |
334 | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE); | |
335 | break; | |
336 | } | |
a5b85f79 | 337 | printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset); |
54936004 FB |
338 | } |
339 | #endif | |
340 | ||
e89f07d3 PB |
341 | if (offset & ~TARGET_PAGE_MASK) { |
342 | errno = EINVAL; | |
c8a706fe | 343 | goto fail; |
e89f07d3 | 344 | } |
54936004 FB |
345 | |
346 | len = TARGET_PAGE_ALIGN(len); | |
347 | if (len == 0) | |
c8a706fe | 348 | goto the_end; |
53a5960a | 349 | real_start = start & qemu_host_page_mask; |
54936004 FB |
350 | |
351 | if (!(flags & MAP_FIXED)) { | |
a03e2d42 FB |
352 | abi_ulong mmap_start; |
353 | void *p; | |
354 | host_offset = offset & qemu_host_page_mask; | |
355 | host_len = len + offset - host_offset; | |
356 | host_len = HOST_PAGE_ALIGN(host_len); | |
357 | mmap_start = mmap_find_vma(real_start, host_len); | |
358 | if (mmap_start == (abi_ulong)-1) { | |
359 | errno = ENOMEM; | |
c8a706fe | 360 | goto fail; |
54936004 | 361 | } |
a03e2d42 FB |
362 | /* Note: we prefer to control the mapping address. It is |
363 | especially important if qemu_host_page_size > | |
364 | qemu_real_host_page_size */ | |
365 | p = mmap(g2h(mmap_start), | |
366 | host_len, prot, flags | MAP_FIXED, fd, host_offset); | |
367 | if (p == MAP_FAILED) | |
c8a706fe | 368 | goto fail; |
a03e2d42 FB |
369 | /* update start so that it points to the file position at 'offset' */ |
370 | host_start = (unsigned long)p; | |
371 | if (!(flags & MAP_ANONYMOUS)) | |
372 | host_start += offset - host_offset; | |
373 | start = h2g(host_start); | |
374 | } else { | |
7ab240ad AZ |
375 | int flg; |
376 | target_ulong addr; | |
377 | ||
a03e2d42 | 378 | if (start & ~TARGET_PAGE_MASK) { |
e89f07d3 | 379 | errno = EINVAL; |
c8a706fe | 380 | goto fail; |
e89f07d3 | 381 | } |
a03e2d42 FB |
382 | end = start + len; |
383 | real_end = HOST_PAGE_ALIGN(end); | |
7ab240ad | 384 | |
45bc1f52 AJ |
385 | /* |
386 | * Test if requested memory area fits target address space | |
387 | * It can fail only on 64-bit host with 32-bit target. | |
388 | * On any other target/host host mmap() handles this error correctly. | |
389 | */ | |
390 | if ((unsigned long)start + len - 1 > (abi_ulong) -1) { | |
391 | errno = EINVAL; | |
392 | goto fail; | |
393 | } | |
394 | ||
7ab240ad AZ |
395 | for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) { |
396 | flg = page_get_flags(addr); | |
397 | if (flg & PAGE_RESERVED) { | |
398 | errno = ENXIO; | |
c8a706fe | 399 | goto fail; |
7ab240ad AZ |
400 | } |
401 | } | |
402 | ||
a03e2d42 FB |
403 | /* worst case: we cannot map the file because the offset is not |
404 | aligned, so we read it */ | |
405 | if (!(flags & MAP_ANONYMOUS) && | |
406 | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { | |
407 | /* msync() won't work here, so we return an error if write is | |
408 | possible while it is a shared mapping */ | |
409 | if ((flags & MAP_TYPE) == MAP_SHARED && | |
410 | (prot & PROT_WRITE)) { | |
411 | errno = EINVAL; | |
c8a706fe | 412 | goto fail; |
a03e2d42 FB |
413 | } |
414 | retaddr = target_mmap(start, len, prot | PROT_WRITE, | |
415 | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, | |
416 | -1, 0); | |
417 | if (retaddr == -1) | |
c8a706fe | 418 | goto fail; |
a03e2d42 FB |
419 | pread(fd, g2h(start), len, offset); |
420 | if (!(prot & PROT_WRITE)) { | |
421 | ret = target_mprotect(start, len, prot); | |
c8a706fe PB |
422 | if (ret != 0) { |
423 | start = ret; | |
424 | goto the_end; | |
425 | } | |
a03e2d42 FB |
426 | } |
427 | goto the_end; | |
54936004 | 428 | } |
a03e2d42 FB |
429 | |
430 | /* handle the start of the mapping */ | |
431 | if (start > real_start) { | |
432 | if (real_end == real_start + qemu_host_page_size) { | |
433 | /* one single host page */ | |
434 | ret = mmap_frag(real_start, start, end, | |
435 | prot, flags, fd, offset); | |
436 | if (ret == -1) | |
c8a706fe | 437 | goto fail; |
a03e2d42 FB |
438 | goto the_end1; |
439 | } | |
440 | ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, | |
54936004 FB |
441 | prot, flags, fd, offset); |
442 | if (ret == -1) | |
c8a706fe | 443 | goto fail; |
a03e2d42 FB |
444 | real_start += qemu_host_page_size; |
445 | } | |
446 | /* handle the end of the mapping */ | |
447 | if (end < real_end) { | |
448 | ret = mmap_frag(real_end - qemu_host_page_size, | |
449 | real_end - qemu_host_page_size, real_end, | |
450 | prot, flags, fd, | |
451 | offset + real_end - qemu_host_page_size - start); | |
452 | if (ret == -1) | |
c8a706fe | 453 | goto fail; |
a03e2d42 | 454 | real_end -= qemu_host_page_size; |
54936004 | 455 | } |
3b46e624 | 456 | |
a03e2d42 FB |
457 | /* map the middle (easier) */ |
458 | if (real_start < real_end) { | |
459 | void *p; | |
460 | unsigned long offset1; | |
461 | if (flags & MAP_ANONYMOUS) | |
462 | offset1 = 0; | |
463 | else | |
464 | offset1 = offset + real_start - start; | |
465 | p = mmap(g2h(real_start), real_end - real_start, | |
466 | prot, flags, fd, offset1); | |
467 | if (p == MAP_FAILED) | |
c8a706fe | 468 | goto fail; |
a03e2d42 | 469 | } |
54936004 FB |
470 | } |
471 | the_end1: | |
472 | page_set_flags(start, start + len, prot | PAGE_VALID); | |
473 | the_end: | |
474 | #ifdef DEBUG_MMAP | |
2e0ded9c | 475 | printf("ret=0x" TARGET_FMT_lx "\n", start); |
54936004 FB |
476 | page_dump(stdout); |
477 | printf("\n"); | |
478 | #endif | |
c8a706fe | 479 | mmap_unlock(); |
54936004 | 480 | return start; |
c8a706fe PB |
481 | fail: |
482 | mmap_unlock(); | |
483 | return -1; | |
54936004 FB |
484 | } |
485 | ||
992f48a0 | 486 | int target_munmap(abi_ulong start, abi_ulong len) |
54936004 | 487 | { |
992f48a0 | 488 | abi_ulong end, real_start, real_end, addr; |
54936004 FB |
489 | int prot, ret; |
490 | ||
491 | #ifdef DEBUG_MMAP | |
492 | printf("munmap: start=0x%lx len=0x%lx\n", start, len); | |
493 | #endif | |
494 | if (start & ~TARGET_PAGE_MASK) | |
495 | return -EINVAL; | |
496 | len = TARGET_PAGE_ALIGN(len); | |
497 | if (len == 0) | |
498 | return -EINVAL; | |
c8a706fe | 499 | mmap_lock(); |
54936004 | 500 | end = start + len; |
53a5960a PB |
501 | real_start = start & qemu_host_page_mask; |
502 | real_end = HOST_PAGE_ALIGN(end); | |
54936004 | 503 | |
53a5960a | 504 | if (start > real_start) { |
54936004 FB |
505 | /* handle host page containing start */ |
506 | prot = 0; | |
53a5960a | 507 | for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) { |
54936004 FB |
508 | prot |= page_get_flags(addr); |
509 | } | |
53a5960a PB |
510 | if (real_end == real_start + qemu_host_page_size) { |
511 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { | |
d418c81e FB |
512 | prot |= page_get_flags(addr); |
513 | } | |
53a5960a | 514 | end = real_end; |
d418c81e | 515 | } |
54936004 | 516 | if (prot != 0) |
53a5960a | 517 | real_start += qemu_host_page_size; |
54936004 | 518 | } |
53a5960a | 519 | if (end < real_end) { |
54936004 | 520 | prot = 0; |
53a5960a | 521 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { |
54936004 FB |
522 | prot |= page_get_flags(addr); |
523 | } | |
524 | if (prot != 0) | |
53a5960a | 525 | real_end -= qemu_host_page_size; |
54936004 | 526 | } |
3b46e624 | 527 | |
c8a706fe | 528 | ret = 0; |
54936004 | 529 | /* unmap what we can */ |
53a5960a | 530 | if (real_start < real_end) { |
4118a970 | 531 | ret = munmap(g2h(real_start), real_end - real_start); |
54936004 FB |
532 | } |
533 | ||
c8a706fe PB |
534 | if (ret == 0) |
535 | page_set_flags(start, start + len, 0); | |
536 | mmap_unlock(); | |
537 | return ret; | |
54936004 FB |
538 | } |
539 | ||
540 | /* XXX: currently, we only handle MAP_ANONYMOUS and not MAP_FIXED | |
541 | blocks which have been allocated starting on a host page */ | |
992f48a0 BS |
542 | abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, |
543 | abi_ulong new_size, unsigned long flags, | |
544 | abi_ulong new_addr) | |
54936004 FB |
545 | { |
546 | int prot; | |
a5b85f79 | 547 | unsigned long host_addr; |
54936004 | 548 | |
c8a706fe | 549 | mmap_lock(); |
54936004 | 550 | /* XXX: use 5 args syscall */ |
a5b85f79 | 551 | host_addr = (long)mremap(g2h(old_addr), old_size, new_size, flags); |
c8a706fe PB |
552 | if (host_addr == -1) { |
553 | new_addr = -1; | |
554 | } else { | |
555 | new_addr = h2g(host_addr); | |
556 | prot = page_get_flags(old_addr); | |
557 | page_set_flags(old_addr, old_addr + old_size, 0); | |
558 | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); | |
559 | } | |
560 | mmap_unlock(); | |
54936004 FB |
561 | return new_addr; |
562 | } | |
563 | ||
992f48a0 | 564 | int target_msync(abi_ulong start, abi_ulong len, int flags) |
54936004 | 565 | { |
992f48a0 | 566 | abi_ulong end; |
54936004 FB |
567 | |
568 | if (start & ~TARGET_PAGE_MASK) | |
569 | return -EINVAL; | |
570 | len = TARGET_PAGE_ALIGN(len); | |
54936004 | 571 | end = start + len; |
d418c81e FB |
572 | if (end < start) |
573 | return -EINVAL; | |
574 | if (end == start) | |
575 | return 0; | |
3b46e624 | 576 | |
83fb7adf | 577 | start &= qemu_host_page_mask; |
53a5960a | 578 | return msync(g2h(start), end - start, flags); |
54936004 | 579 | } |