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