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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 | |
530e7615 BS |
18 | * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
19 | * MA 02110-1301, USA. | |
54936004 FB |
20 | */ |
21 | #include <stdlib.h> | |
22 | #include <stdio.h> | |
23 | #include <stdarg.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | #include <errno.h> | |
27 | #include <sys/mman.h> | |
3af72a4d BS |
28 | #include <linux/mman.h> |
29 | #include <linux/unistd.h> | |
54936004 FB |
30 | |
31 | #include "qemu.h" | |
78f5bf1e | 32 | #include "qemu-common.h" |
54936004 FB |
33 | |
34 | //#define DEBUG_MMAP | |
35 | ||
c8a706fe PB |
36 | #if defined(USE_NPTL) |
37 | pthread_mutex_t mmap_mutex; | |
38 | static int __thread mmap_lock_count; | |
39 | ||
40 | void mmap_lock(void) | |
41 | { | |
42 | if (mmap_lock_count++ == 0) { | |
43 | pthread_mutex_lock(&mmap_mutex); | |
44 | } | |
45 | } | |
46 | ||
47 | void mmap_unlock(void) | |
48 | { | |
49 | if (--mmap_lock_count == 0) { | |
50 | pthread_mutex_unlock(&mmap_mutex); | |
51 | } | |
52 | } | |
d5975363 PB |
53 | |
54 | /* Grab lock to make sure things are in a consistent state after fork(). */ | |
55 | void mmap_fork_start(void) | |
56 | { | |
57 | if (mmap_lock_count) | |
58 | abort(); | |
59 | pthread_mutex_lock(&mmap_mutex); | |
60 | } | |
61 | ||
62 | void mmap_fork_end(int child) | |
63 | { | |
64 | if (child) | |
65 | pthread_mutex_init(&mmap_mutex, NULL); | |
66 | else | |
67 | pthread_mutex_unlock(&mmap_mutex); | |
68 | } | |
c8a706fe PB |
69 | #else |
70 | /* We aren't threadsafe to start with, so no need to worry about locking. */ | |
71 | void mmap_lock(void) | |
72 | { | |
73 | } | |
74 | ||
75 | void mmap_unlock(void) | |
76 | { | |
77 | } | |
78 | #endif | |
79 | ||
17e2377a PB |
80 | void *qemu_vmalloc(size_t size) |
81 | { | |
82 | void *p; | |
83 | unsigned long addr; | |
84 | mmap_lock(); | |
85 | /* Use map and mark the pages as used. */ | |
86 | p = mmap(NULL, size, PROT_READ | PROT_WRITE, | |
87 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
88 | ||
89 | addr = (unsigned long)p; | |
90 | if (addr == (target_ulong) addr) { | |
91 | /* Allocated region overlaps guest address space. | |
92 | This may recurse. */ | |
93 | page_set_flags(addr & TARGET_PAGE_MASK, TARGET_PAGE_ALIGN(addr + size), | |
94 | PAGE_RESERVED); | |
95 | } | |
96 | ||
97 | mmap_unlock(); | |
98 | return p; | |
99 | } | |
100 | ||
101 | void *qemu_malloc(size_t size) | |
102 | { | |
103 | char * p; | |
104 | size += 16; | |
105 | p = qemu_vmalloc(size); | |
106 | *(size_t *)p = size; | |
107 | return p + 16; | |
108 | } | |
109 | ||
110 | /* We use map, which is always zero initialized. */ | |
111 | void * qemu_mallocz(size_t size) | |
112 | { | |
113 | return qemu_malloc(size); | |
114 | } | |
115 | ||
116 | void qemu_free(void *ptr) | |
117 | { | |
118 | /* FIXME: We should unmark the reserved pages here. However this gets | |
119 | complicated when one target page spans multiple host pages, so we | |
120 | don't bother. */ | |
121 | size_t *p; | |
122 | p = (size_t *)((char *)ptr - 16); | |
123 | munmap(p, *p); | |
124 | } | |
125 | ||
1a6f0dbc AL |
126 | void *qemu_realloc(void *ptr, size_t size) |
127 | { | |
128 | size_t old_size, copy; | |
129 | void *new_ptr; | |
130 | ||
baa8c602 | 131 | if (!ptr) |
132 | return qemu_malloc(size); | |
1a6f0dbc AL |
133 | old_size = *(size_t *)((char *)ptr - 16); |
134 | copy = old_size < size ? old_size : size; | |
135 | new_ptr = qemu_malloc(size); | |
136 | memcpy(new_ptr, ptr, copy); | |
137 | qemu_free(ptr); | |
138 | return new_ptr; | |
139 | } | |
140 | ||
53a5960a | 141 | /* NOTE: all the constants are the HOST ones, but addresses are target. */ |
992f48a0 | 142 | int target_mprotect(abi_ulong start, abi_ulong len, int prot) |
54936004 | 143 | { |
992f48a0 | 144 | abi_ulong end, host_start, host_end, addr; |
54936004 FB |
145 | int prot1, ret; |
146 | ||
147 | #ifdef DEBUG_MMAP | |
a5b85f79 | 148 | printf("mprotect: start=0x" TARGET_FMT_lx |
80210bcd | 149 | "len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len, |
54936004 FB |
150 | prot & PROT_READ ? 'r' : '-', |
151 | prot & PROT_WRITE ? 'w' : '-', | |
152 | prot & PROT_EXEC ? 'x' : '-'); | |
153 | #endif | |
154 | ||
155 | if ((start & ~TARGET_PAGE_MASK) != 0) | |
156 | return -EINVAL; | |
157 | len = TARGET_PAGE_ALIGN(len); | |
158 | end = start + len; | |
159 | if (end < start) | |
160 | return -EINVAL; | |
171cd1cd | 161 | prot &= PROT_READ | PROT_WRITE | PROT_EXEC; |
54936004 FB |
162 | if (len == 0) |
163 | return 0; | |
3b46e624 | 164 | |
c8a706fe | 165 | mmap_lock(); |
83fb7adf | 166 | host_start = start & qemu_host_page_mask; |
54936004 FB |
167 | host_end = HOST_PAGE_ALIGN(end); |
168 | if (start > host_start) { | |
169 | /* handle host page containing start */ | |
170 | prot1 = prot; | |
171 | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) { | |
172 | prot1 |= page_get_flags(addr); | |
173 | } | |
83fb7adf | 174 | if (host_end == host_start + qemu_host_page_size) { |
d418c81e FB |
175 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { |
176 | prot1 |= page_get_flags(addr); | |
177 | } | |
178 | end = host_end; | |
179 | } | |
53a5960a | 180 | ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS); |
54936004 | 181 | if (ret != 0) |
c8a706fe | 182 | goto error; |
83fb7adf | 183 | host_start += qemu_host_page_size; |
54936004 FB |
184 | } |
185 | if (end < host_end) { | |
54936004 FB |
186 | prot1 = prot; |
187 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { | |
188 | prot1 |= page_get_flags(addr); | |
189 | } | |
5fafdf24 | 190 | ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size, |
54936004 FB |
191 | prot1 & PAGE_BITS); |
192 | if (ret != 0) | |
c8a706fe | 193 | goto error; |
83fb7adf | 194 | host_end -= qemu_host_page_size; |
54936004 | 195 | } |
3b46e624 | 196 | |
54936004 FB |
197 | /* handle the pages in the middle */ |
198 | if (host_start < host_end) { | |
53a5960a | 199 | ret = mprotect(g2h(host_start), host_end - host_start, prot); |
54936004 | 200 | if (ret != 0) |
c8a706fe | 201 | goto error; |
54936004 | 202 | } |
54936004 | 203 | page_set_flags(start, start + len, prot | PAGE_VALID); |
c8a706fe | 204 | mmap_unlock(); |
54936004 | 205 | return 0; |
c8a706fe PB |
206 | error: |
207 | mmap_unlock(); | |
208 | return ret; | |
54936004 FB |
209 | } |
210 | ||
211 | /* map an incomplete host page */ | |
992f48a0 BS |
212 | static int mmap_frag(abi_ulong real_start, |
213 | abi_ulong start, abi_ulong end, | |
214 | int prot, int flags, int fd, abi_ulong offset) | |
54936004 | 215 | { |
80210bcd | 216 | abi_ulong real_end, addr; |
53a5960a | 217 | void *host_start; |
54936004 FB |
218 | int prot1, prot_new; |
219 | ||
53a5960a PB |
220 | real_end = real_start + qemu_host_page_size; |
221 | host_start = g2h(real_start); | |
54936004 FB |
222 | |
223 | /* get the protection of the target pages outside the mapping */ | |
224 | prot1 = 0; | |
53a5960a | 225 | for(addr = real_start; addr < real_end; addr++) { |
54936004 FB |
226 | if (addr < start || addr >= end) |
227 | prot1 |= page_get_flags(addr); | |
228 | } | |
3b46e624 | 229 | |
54936004 FB |
230 | if (prot1 == 0) { |
231 | /* no page was there, so we allocate one */ | |
80210bcd TS |
232 | void *p = mmap(host_start, qemu_host_page_size, prot, |
233 | flags | MAP_ANONYMOUS, -1, 0); | |
234 | if (p == MAP_FAILED) | |
235 | return -1; | |
53a5960a | 236 | prot1 = prot; |
54936004 FB |
237 | } |
238 | prot1 &= PAGE_BITS; | |
239 | ||
240 | prot_new = prot | prot1; | |
241 | if (!(flags & MAP_ANONYMOUS)) { | |
242 | /* msync() won't work here, so we return an error if write is | |
243 | possible while it is a shared mapping */ | |
244 | if ((flags & MAP_TYPE) == MAP_SHARED && | |
245 | (prot & PROT_WRITE)) | |
246 | return -EINVAL; | |
247 | ||
248 | /* adjust protection to be able to read */ | |
249 | if (!(prot1 & PROT_WRITE)) | |
53a5960a | 250 | mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); |
3b46e624 | 251 | |
54936004 | 252 | /* read the corresponding file data */ |
53a5960a | 253 | pread(fd, g2h(start), end - start, offset); |
3b46e624 | 254 | |
54936004 FB |
255 | /* put final protection */ |
256 | if (prot_new != (prot1 | PROT_WRITE)) | |
53a5960a | 257 | mprotect(host_start, qemu_host_page_size, prot_new); |
54936004 FB |
258 | } else { |
259 | /* just update the protection */ | |
260 | if (prot_new != prot1) { | |
53a5960a | 261 | mprotect(host_start, qemu_host_page_size, prot_new); |
54936004 FB |
262 | } |
263 | } | |
264 | return 0; | |
265 | } | |
266 | ||
a03e2d42 FB |
267 | #if defined(__CYGWIN__) |
268 | /* Cygwin doesn't have a whole lot of address space. */ | |
269 | static abi_ulong mmap_next_start = 0x18000000; | |
270 | #else | |
271 | static abi_ulong mmap_next_start = 0x40000000; | |
272 | #endif | |
273 | ||
0776590d PB |
274 | unsigned long last_brk; |
275 | ||
a03e2d42 FB |
276 | /* find a free memory area of size 'size'. The search starts at |
277 | 'start'. If 'start' == 0, then a default start address is used. | |
278 | Return -1 if error. | |
279 | */ | |
50a9569b | 280 | /* page_init() marks pages used by the host as reserved to be sure not |
a03e2d42 FB |
281 | to use them. */ |
282 | static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size) | |
283 | { | |
284 | abi_ulong addr, addr1, addr_start; | |
285 | int prot; | |
0776590d PB |
286 | unsigned long new_brk; |
287 | ||
288 | new_brk = (unsigned long)sbrk(0); | |
289 | if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) { | |
290 | /* This is a hack to catch the host allocating memory with brk(). | |
291 | If it uses mmap then we loose. | |
292 | FIXME: We really want to avoid the host allocating memory in | |
293 | the first place, and maybe leave some slack to avoid switching | |
294 | to mmap. */ | |
295 | page_set_flags(last_brk & TARGET_PAGE_MASK, | |
296 | TARGET_PAGE_ALIGN(new_brk), | |
297 | PAGE_RESERVED); | |
298 | } | |
299 | last_brk = new_brk; | |
a03e2d42 FB |
300 | |
301 | size = HOST_PAGE_ALIGN(size); | |
302 | start = start & qemu_host_page_mask; | |
303 | addr = start; | |
304 | if (addr == 0) | |
305 | addr = mmap_next_start; | |
306 | addr_start = addr; | |
307 | for(;;) { | |
308 | prot = 0; | |
309 | for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) { | |
310 | prot |= page_get_flags(addr1); | |
311 | } | |
312 | if (prot == 0) | |
313 | break; | |
314 | addr += qemu_host_page_size; | |
315 | /* we found nothing */ | |
316 | if (addr == addr_start) | |
317 | return (abi_ulong)-1; | |
318 | } | |
319 | if (start == 0) | |
320 | mmap_next_start = addr + size; | |
321 | return addr; | |
322 | } | |
323 | ||
54936004 | 324 | /* NOTE: all the constants are the HOST ones */ |
992f48a0 BS |
325 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, |
326 | int flags, int fd, abi_ulong offset) | |
54936004 | 327 | { |
992f48a0 | 328 | abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len; |
a5b85f79 | 329 | unsigned long host_start; |
54936004 | 330 | |
c8a706fe | 331 | mmap_lock(); |
54936004 FB |
332 | #ifdef DEBUG_MMAP |
333 | { | |
a5b85f79 | 334 | printf("mmap: start=0x" TARGET_FMT_lx |
80210bcd | 335 | " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=", |
5fafdf24 | 336 | start, len, |
54936004 FB |
337 | prot & PROT_READ ? 'r' : '-', |
338 | prot & PROT_WRITE ? 'w' : '-', | |
339 | prot & PROT_EXEC ? 'x' : '-'); | |
340 | if (flags & MAP_FIXED) | |
341 | printf("MAP_FIXED "); | |
342 | if (flags & MAP_ANONYMOUS) | |
343 | printf("MAP_ANON "); | |
344 | switch(flags & MAP_TYPE) { | |
345 | case MAP_PRIVATE: | |
346 | printf("MAP_PRIVATE "); | |
347 | break; | |
348 | case MAP_SHARED: | |
349 | printf("MAP_SHARED "); | |
350 | break; | |
351 | default: | |
352 | printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE); | |
353 | break; | |
354 | } | |
a5b85f79 | 355 | printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset); |
54936004 FB |
356 | } |
357 | #endif | |
358 | ||
e89f07d3 PB |
359 | if (offset & ~TARGET_PAGE_MASK) { |
360 | errno = EINVAL; | |
c8a706fe | 361 | goto fail; |
e89f07d3 | 362 | } |
54936004 FB |
363 | |
364 | len = TARGET_PAGE_ALIGN(len); | |
365 | if (len == 0) | |
c8a706fe | 366 | goto the_end; |
53a5960a | 367 | real_start = start & qemu_host_page_mask; |
54936004 FB |
368 | |
369 | if (!(flags & MAP_FIXED)) { | |
a03e2d42 FB |
370 | abi_ulong mmap_start; |
371 | void *p; | |
372 | host_offset = offset & qemu_host_page_mask; | |
373 | host_len = len + offset - host_offset; | |
374 | host_len = HOST_PAGE_ALIGN(host_len); | |
375 | mmap_start = mmap_find_vma(real_start, host_len); | |
376 | if (mmap_start == (abi_ulong)-1) { | |
377 | errno = ENOMEM; | |
c8a706fe | 378 | goto fail; |
54936004 | 379 | } |
a03e2d42 FB |
380 | /* Note: we prefer to control the mapping address. It is |
381 | especially important if qemu_host_page_size > | |
382 | qemu_real_host_page_size */ | |
383 | p = mmap(g2h(mmap_start), | |
384 | host_len, prot, flags | MAP_FIXED, fd, host_offset); | |
385 | if (p == MAP_FAILED) | |
c8a706fe | 386 | goto fail; |
a03e2d42 FB |
387 | /* update start so that it points to the file position at 'offset' */ |
388 | host_start = (unsigned long)p; | |
389 | if (!(flags & MAP_ANONYMOUS)) | |
390 | host_start += offset - host_offset; | |
391 | start = h2g(host_start); | |
392 | } else { | |
7ab240ad AZ |
393 | int flg; |
394 | target_ulong addr; | |
395 | ||
a03e2d42 | 396 | if (start & ~TARGET_PAGE_MASK) { |
e89f07d3 | 397 | errno = EINVAL; |
c8a706fe | 398 | goto fail; |
e89f07d3 | 399 | } |
a03e2d42 FB |
400 | end = start + len; |
401 | real_end = HOST_PAGE_ALIGN(end); | |
7ab240ad | 402 | |
45bc1f52 AJ |
403 | /* |
404 | * Test if requested memory area fits target address space | |
405 | * It can fail only on 64-bit host with 32-bit target. | |
406 | * On any other target/host host mmap() handles this error correctly. | |
407 | */ | |
408 | if ((unsigned long)start + len - 1 > (abi_ulong) -1) { | |
409 | errno = EINVAL; | |
410 | goto fail; | |
411 | } | |
412 | ||
7ab240ad AZ |
413 | for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) { |
414 | flg = page_get_flags(addr); | |
415 | if (flg & PAGE_RESERVED) { | |
416 | errno = ENXIO; | |
c8a706fe | 417 | goto fail; |
7ab240ad AZ |
418 | } |
419 | } | |
420 | ||
a03e2d42 FB |
421 | /* worst case: we cannot map the file because the offset is not |
422 | aligned, so we read it */ | |
423 | if (!(flags & MAP_ANONYMOUS) && | |
424 | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { | |
425 | /* msync() won't work here, so we return an error if write is | |
426 | possible while it is a shared mapping */ | |
427 | if ((flags & MAP_TYPE) == MAP_SHARED && | |
428 | (prot & PROT_WRITE)) { | |
429 | errno = EINVAL; | |
c8a706fe | 430 | goto fail; |
a03e2d42 FB |
431 | } |
432 | retaddr = target_mmap(start, len, prot | PROT_WRITE, | |
433 | MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, | |
434 | -1, 0); | |
435 | if (retaddr == -1) | |
c8a706fe | 436 | goto fail; |
a03e2d42 FB |
437 | pread(fd, g2h(start), len, offset); |
438 | if (!(prot & PROT_WRITE)) { | |
439 | ret = target_mprotect(start, len, prot); | |
c8a706fe PB |
440 | if (ret != 0) { |
441 | start = ret; | |
442 | goto the_end; | |
443 | } | |
a03e2d42 FB |
444 | } |
445 | goto the_end; | |
54936004 | 446 | } |
a03e2d42 FB |
447 | |
448 | /* handle the start of the mapping */ | |
449 | if (start > real_start) { | |
450 | if (real_end == real_start + qemu_host_page_size) { | |
451 | /* one single host page */ | |
452 | ret = mmap_frag(real_start, start, end, | |
453 | prot, flags, fd, offset); | |
454 | if (ret == -1) | |
c8a706fe | 455 | goto fail; |
a03e2d42 FB |
456 | goto the_end1; |
457 | } | |
458 | ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, | |
54936004 FB |
459 | prot, flags, fd, offset); |
460 | if (ret == -1) | |
c8a706fe | 461 | goto fail; |
a03e2d42 FB |
462 | real_start += qemu_host_page_size; |
463 | } | |
464 | /* handle the end of the mapping */ | |
465 | if (end < real_end) { | |
466 | ret = mmap_frag(real_end - qemu_host_page_size, | |
467 | real_end - qemu_host_page_size, real_end, | |
468 | prot, flags, fd, | |
469 | offset + real_end - qemu_host_page_size - start); | |
470 | if (ret == -1) | |
c8a706fe | 471 | goto fail; |
a03e2d42 | 472 | real_end -= qemu_host_page_size; |
54936004 | 473 | } |
3b46e624 | 474 | |
a03e2d42 FB |
475 | /* map the middle (easier) */ |
476 | if (real_start < real_end) { | |
477 | void *p; | |
478 | unsigned long offset1; | |
479 | if (flags & MAP_ANONYMOUS) | |
480 | offset1 = 0; | |
481 | else | |
482 | offset1 = offset + real_start - start; | |
483 | p = mmap(g2h(real_start), real_end - real_start, | |
484 | prot, flags, fd, offset1); | |
485 | if (p == MAP_FAILED) | |
c8a706fe | 486 | goto fail; |
a03e2d42 | 487 | } |
54936004 FB |
488 | } |
489 | the_end1: | |
490 | page_set_flags(start, start + len, prot | PAGE_VALID); | |
491 | the_end: | |
492 | #ifdef DEBUG_MMAP | |
2e0ded9c | 493 | printf("ret=0x" TARGET_FMT_lx "\n", start); |
54936004 FB |
494 | page_dump(stdout); |
495 | printf("\n"); | |
496 | #endif | |
c8a706fe | 497 | mmap_unlock(); |
54936004 | 498 | return start; |
c8a706fe PB |
499 | fail: |
500 | mmap_unlock(); | |
501 | return -1; | |
54936004 FB |
502 | } |
503 | ||
992f48a0 | 504 | int target_munmap(abi_ulong start, abi_ulong len) |
54936004 | 505 | { |
992f48a0 | 506 | abi_ulong end, real_start, real_end, addr; |
54936004 FB |
507 | int prot, ret; |
508 | ||
509 | #ifdef DEBUG_MMAP | |
510 | printf("munmap: start=0x%lx len=0x%lx\n", start, len); | |
511 | #endif | |
512 | if (start & ~TARGET_PAGE_MASK) | |
513 | return -EINVAL; | |
514 | len = TARGET_PAGE_ALIGN(len); | |
515 | if (len == 0) | |
516 | return -EINVAL; | |
c8a706fe | 517 | mmap_lock(); |
54936004 | 518 | end = start + len; |
53a5960a PB |
519 | real_start = start & qemu_host_page_mask; |
520 | real_end = HOST_PAGE_ALIGN(end); | |
54936004 | 521 | |
53a5960a | 522 | if (start > real_start) { |
54936004 FB |
523 | /* handle host page containing start */ |
524 | prot = 0; | |
53a5960a | 525 | for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) { |
54936004 FB |
526 | prot |= page_get_flags(addr); |
527 | } | |
53a5960a PB |
528 | if (real_end == real_start + qemu_host_page_size) { |
529 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { | |
d418c81e FB |
530 | prot |= page_get_flags(addr); |
531 | } | |
53a5960a | 532 | end = real_end; |
d418c81e | 533 | } |
54936004 | 534 | if (prot != 0) |
53a5960a | 535 | real_start += qemu_host_page_size; |
54936004 | 536 | } |
53a5960a | 537 | if (end < real_end) { |
54936004 | 538 | prot = 0; |
53a5960a | 539 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { |
54936004 FB |
540 | prot |= page_get_flags(addr); |
541 | } | |
542 | if (prot != 0) | |
53a5960a | 543 | real_end -= qemu_host_page_size; |
54936004 | 544 | } |
3b46e624 | 545 | |
c8a706fe | 546 | ret = 0; |
54936004 | 547 | /* unmap what we can */ |
53a5960a | 548 | if (real_start < real_end) { |
4118a970 | 549 | ret = munmap(g2h(real_start), real_end - real_start); |
54936004 FB |
550 | } |
551 | ||
c8a706fe PB |
552 | if (ret == 0) |
553 | page_set_flags(start, start + len, 0); | |
554 | mmap_unlock(); | |
555 | return ret; | |
54936004 FB |
556 | } |
557 | ||
992f48a0 BS |
558 | abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, |
559 | abi_ulong new_size, unsigned long flags, | |
560 | abi_ulong new_addr) | |
54936004 FB |
561 | { |
562 | int prot; | |
f19412a2 | 563 | void *host_addr; |
54936004 | 564 | |
c8a706fe | 565 | mmap_lock(); |
f19412a2 AJ |
566 | |
567 | if (flags & MREMAP_FIXED) | |
3af72a4d BS |
568 | host_addr = (void *) syscall(__NR_mremap, g2h(old_addr), |
569 | old_size, new_size, | |
570 | flags, | |
571 | new_addr); | |
f19412a2 AJ |
572 | else if (flags & MREMAP_MAYMOVE) { |
573 | abi_ulong mmap_start; | |
574 | ||
575 | mmap_start = mmap_find_vma(0, new_size); | |
576 | ||
577 | if (mmap_start == -1) { | |
578 | errno = ENOMEM; | |
579 | host_addr = MAP_FAILED; | |
580 | } else | |
3af72a4d BS |
581 | host_addr = (void *) syscall(__NR_mremap, g2h(old_addr), |
582 | old_size, new_size, | |
583 | flags | MREMAP_FIXED, | |
584 | g2h(mmap_start)); | |
585 | } else { | |
f19412a2 AJ |
586 | host_addr = mremap(g2h(old_addr), old_size, new_size, flags); |
587 | /* Check if address fits target address space */ | |
588 | if ((unsigned long)host_addr + new_size > (abi_ulong)-1) { | |
589 | /* Revert mremap() changes */ | |
590 | host_addr = mremap(g2h(old_addr), new_size, old_size, flags); | |
591 | errno = ENOMEM; | |
592 | host_addr = MAP_FAILED; | |
593 | } | |
594 | } | |
595 | ||
596 | if (host_addr == MAP_FAILED) { | |
c8a706fe PB |
597 | new_addr = -1; |
598 | } else { | |
599 | new_addr = h2g(host_addr); | |
600 | prot = page_get_flags(old_addr); | |
601 | page_set_flags(old_addr, old_addr + old_size, 0); | |
602 | page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID); | |
603 | } | |
604 | mmap_unlock(); | |
54936004 FB |
605 | return new_addr; |
606 | } | |
607 | ||
992f48a0 | 608 | int target_msync(abi_ulong start, abi_ulong len, int flags) |
54936004 | 609 | { |
992f48a0 | 610 | abi_ulong end; |
54936004 FB |
611 | |
612 | if (start & ~TARGET_PAGE_MASK) | |
613 | return -EINVAL; | |
614 | len = TARGET_PAGE_ALIGN(len); | |
54936004 | 615 | end = start + len; |
d418c81e FB |
616 | if (end < start) |
617 | return -EINVAL; | |
618 | if (end == start) | |
619 | return 0; | |
3b46e624 | 620 | |
83fb7adf | 621 | start &= qemu_host_page_mask; |
53a5960a | 622 | return msync(g2h(start), end - start, flags); |
54936004 | 623 | } |