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1.1 root 1: /*
2: * mmap support for qemu
1.1.1.4 root 3: *
1.1 root 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
1.1.1.6 ! root 17: * along with this program; if not, see <http://www.gnu.org/licenses/>.
1.1 root 18: */
19: #include <stdlib.h>
20: #include <stdio.h>
21: #include <stdarg.h>
22: #include <string.h>
23: #include <unistd.h>
24: #include <errno.h>
1.1.1.5 root 25: #include <sys/types.h>
26: #include <sys/stat.h>
1.1 root 27: #include <sys/mman.h>
1.1.1.5 root 28: #include <linux/mman.h>
29: #include <linux/unistd.h>
1.1 root 30:
31: #include "qemu.h"
1.1.1.5 root 32: #include "qemu-common.h"
1.1 root 33:
34: //#define DEBUG_MMAP
35:
1.1.1.5 root 36: #if defined(USE_NPTL)
1.1.1.6 ! root 37: pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
1.1.1.5 root 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: }
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: }
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:
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:
126: void *qemu_realloc(void *ptr, size_t size)
127: {
128: size_t old_size, copy;
129: void *new_ptr;
130:
131: if (!ptr)
132: return qemu_malloc(size);
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:
1.1.1.2 root 141: /* NOTE: all the constants are the HOST ones, but addresses are target. */
1.1.1.4 root 142: int target_mprotect(abi_ulong start, abi_ulong len, int prot)
1.1 root 143: {
1.1.1.4 root 144: abi_ulong end, host_start, host_end, addr;
1.1 root 145: int prot1, ret;
146:
147: #ifdef DEBUG_MMAP
1.1.1.6 ! root 148: printf("mprotect: start=0x" TARGET_ABI_FMT_lx
! 149: "len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c\n", start, len,
1.1 root 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;
1.1.1.5 root 161: prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
1.1 root 162: if (len == 0)
163: return 0;
1.1.1.4 root 164:
1.1.1.5 root 165: mmap_lock();
1.1 root 166: host_start = start & qemu_host_page_mask;
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: }
174: if (host_end == host_start + qemu_host_page_size) {
175: for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
176: prot1 |= page_get_flags(addr);
177: }
178: end = host_end;
179: }
1.1.1.2 root 180: ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS);
1.1 root 181: if (ret != 0)
1.1.1.5 root 182: goto error;
1.1 root 183: host_start += qemu_host_page_size;
184: }
185: if (end < host_end) {
186: prot1 = prot;
187: for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
188: prot1 |= page_get_flags(addr);
189: }
1.1.1.4 root 190: ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size,
1.1 root 191: prot1 & PAGE_BITS);
192: if (ret != 0)
1.1.1.5 root 193: goto error;
1.1 root 194: host_end -= qemu_host_page_size;
195: }
1.1.1.4 root 196:
1.1 root 197: /* handle the pages in the middle */
198: if (host_start < host_end) {
1.1.1.2 root 199: ret = mprotect(g2h(host_start), host_end - host_start, prot);
1.1 root 200: if (ret != 0)
1.1.1.5 root 201: goto error;
1.1 root 202: }
203: page_set_flags(start, start + len, prot | PAGE_VALID);
1.1.1.5 root 204: mmap_unlock();
1.1 root 205: return 0;
1.1.1.5 root 206: error:
207: mmap_unlock();
208: return ret;
1.1 root 209: }
210:
211: /* map an incomplete host page */
1.1.1.4 root 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)
1.1 root 215: {
1.1.1.4 root 216: abi_ulong real_end, addr;
1.1.1.2 root 217: void *host_start;
1.1 root 218: int prot1, prot_new;
219:
1.1.1.2 root 220: real_end = real_start + qemu_host_page_size;
221: host_start = g2h(real_start);
1.1 root 222:
223: /* get the protection of the target pages outside the mapping */
224: prot1 = 0;
1.1.1.2 root 225: for(addr = real_start; addr < real_end; addr++) {
1.1 root 226: if (addr < start || addr >= end)
227: prot1 |= page_get_flags(addr);
228: }
1.1.1.4 root 229:
1.1 root 230: if (prot1 == 0) {
231: /* no page was there, so we allocate one */
1.1.1.4 root 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;
1.1.1.2 root 236: prot1 = prot;
1.1 root 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))
1.1.1.2 root 250: mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
1.1.1.4 root 251:
1.1 root 252: /* read the corresponding file data */
1.1.1.2 root 253: pread(fd, g2h(start), end - start, offset);
1.1.1.4 root 254:
1.1 root 255: /* put final protection */
256: if (prot_new != (prot1 | PROT_WRITE))
1.1.1.2 root 257: mprotect(host_start, qemu_host_page_size, prot_new);
1.1 root 258: } else {
259: /* just update the protection */
260: if (prot_new != prot1) {
1.1.1.2 root 261: mprotect(host_start, qemu_host_page_size, prot_new);
1.1 root 262: }
263: }
264: return 0;
265: }
266:
1.1.1.4 root 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:
1.1.1.5 root 274: unsigned long last_brk;
275:
1.1.1.4 root 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: */
280: /* page_init() marks pages used by the host as reserved to be sure not
281: to use them. */
1.1.1.6 ! root 282: abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
1.1.1.4 root 283: {
284: abi_ulong addr, addr1, addr_start;
285: int prot;
1.1.1.5 root 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;
1.1.1.4 root 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:
1.1 root 324: /* NOTE: all the constants are the HOST ones */
1.1.1.4 root 325: abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
326: int flags, int fd, abi_ulong offset)
1.1 root 327: {
1.1.1.4 root 328: abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
329: unsigned long host_start;
1.1 root 330:
1.1.1.5 root 331: mmap_lock();
1.1 root 332: #ifdef DEBUG_MMAP
333: {
1.1.1.6 ! root 334: printf("mmap: start=0x" TARGET_ABI_FMT_lx
! 335: " len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c flags=",
1.1.1.4 root 336: start, len,
1.1 root 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: }
1.1.1.6 ! root 355: printf("fd=%d offset=" TARGET_ABI_FMT_lx "\n", fd, offset);
1.1 root 356: }
357: #endif
358:
1.1.1.2 root 359: if (offset & ~TARGET_PAGE_MASK) {
360: errno = EINVAL;
1.1.1.5 root 361: goto fail;
1.1.1.2 root 362: }
1.1 root 363:
364: len = TARGET_PAGE_ALIGN(len);
365: if (len == 0)
1.1.1.5 root 366: goto the_end;
1.1.1.2 root 367: real_start = start & qemu_host_page_mask;
1.1 root 368:
1.1.1.5 root 369: /* When mapping files into a memory area larger than the file, accesses
370: to pages beyond the file size will cause a SIGBUS.
371:
372: For example, if mmaping a file of 100 bytes on a host with 4K pages
373: emulating a target with 8K pages, the target expects to be able to
374: access the first 8K. But the host will trap us on any access beyond
375: 4K.
376:
377: When emulating a target with a larger page-size than the hosts, we
378: may need to truncate file maps at EOF and add extra anonymous pages
379: up to the targets page boundary. */
380:
381: if ((qemu_real_host_page_size < TARGET_PAGE_SIZE)
382: && !(flags & MAP_ANONYMOUS)) {
383: struct stat sb;
384:
385: if (fstat (fd, &sb) == -1)
386: goto fail;
387:
388: /* Are we trying to create a map beyond EOF?. */
389: if (offset + len > sb.st_size) {
390: /* If so, truncate the file map at eof aligned with
391: the hosts real pagesize. Additional anonymous maps
392: will be created beyond EOF. */
393: len = (sb.st_size - offset);
394: len += qemu_real_host_page_size - 1;
395: len &= ~(qemu_real_host_page_size - 1);
396: }
397: }
398:
1.1 root 399: if (!(flags & MAP_FIXED)) {
1.1.1.4 root 400: abi_ulong mmap_start;
401: void *p;
402: host_offset = offset & qemu_host_page_mask;
403: host_len = len + offset - host_offset;
404: host_len = HOST_PAGE_ALIGN(host_len);
405: mmap_start = mmap_find_vma(real_start, host_len);
406: if (mmap_start == (abi_ulong)-1) {
407: errno = ENOMEM;
1.1.1.5 root 408: goto fail;
1.1 root 409: }
1.1.1.4 root 410: /* Note: we prefer to control the mapping address. It is
411: especially important if qemu_host_page_size >
412: qemu_real_host_page_size */
413: p = mmap(g2h(mmap_start),
1.1.1.5 root 414: host_len, prot, flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
1.1.1.4 root 415: if (p == MAP_FAILED)
1.1.1.5 root 416: goto fail;
1.1.1.4 root 417: /* update start so that it points to the file position at 'offset' */
418: host_start = (unsigned long)p;
1.1.1.5 root 419: if (!(flags & MAP_ANONYMOUS)) {
420: p = mmap(g2h(mmap_start), len, prot,
421: flags | MAP_FIXED, fd, host_offset);
1.1.1.4 root 422: host_start += offset - host_offset;
1.1.1.5 root 423: }
1.1.1.4 root 424: start = h2g(host_start);
425: } else {
1.1.1.5 root 426: int flg;
427: target_ulong addr;
428:
1.1.1.4 root 429: if (start & ~TARGET_PAGE_MASK) {
1.1.1.2 root 430: errno = EINVAL;
1.1.1.5 root 431: goto fail;
1.1.1.2 root 432: }
1.1.1.4 root 433: end = start + len;
434: real_end = HOST_PAGE_ALIGN(end);
1.1.1.5 root 435:
436: /*
437: * Test if requested memory area fits target address space
438: * It can fail only on 64-bit host with 32-bit target.
439: * On any other target/host host mmap() handles this error correctly.
440: */
441: if ((unsigned long)start + len - 1 > (abi_ulong) -1) {
442: errno = EINVAL;
443: goto fail;
444: }
445:
446: for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
447: flg = page_get_flags(addr);
448: if (flg & PAGE_RESERVED) {
449: errno = ENXIO;
450: goto fail;
451: }
452: }
453:
1.1.1.4 root 454: /* worst case: we cannot map the file because the offset is not
455: aligned, so we read it */
456: if (!(flags & MAP_ANONYMOUS) &&
457: (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
458: /* msync() won't work here, so we return an error if write is
459: possible while it is a shared mapping */
460: if ((flags & MAP_TYPE) == MAP_SHARED &&
461: (prot & PROT_WRITE)) {
462: errno = EINVAL;
1.1.1.5 root 463: goto fail;
1.1.1.4 root 464: }
465: retaddr = target_mmap(start, len, prot | PROT_WRITE,
466: MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
467: -1, 0);
468: if (retaddr == -1)
1.1.1.5 root 469: goto fail;
1.1.1.4 root 470: pread(fd, g2h(start), len, offset);
471: if (!(prot & PROT_WRITE)) {
472: ret = target_mprotect(start, len, prot);
1.1.1.5 root 473: if (ret != 0) {
474: start = ret;
475: goto the_end;
476: }
1.1.1.4 root 477: }
478: goto the_end;
1.1 root 479: }
1.1.1.4 root 480:
481: /* handle the start of the mapping */
482: if (start > real_start) {
483: if (real_end == real_start + qemu_host_page_size) {
484: /* one single host page */
485: ret = mmap_frag(real_start, start, end,
486: prot, flags, fd, offset);
487: if (ret == -1)
1.1.1.5 root 488: goto fail;
1.1.1.4 root 489: goto the_end1;
490: }
491: ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
1.1 root 492: prot, flags, fd, offset);
493: if (ret == -1)
1.1.1.5 root 494: goto fail;
1.1.1.4 root 495: real_start += qemu_host_page_size;
496: }
497: /* handle the end of the mapping */
498: if (end < real_end) {
499: ret = mmap_frag(real_end - qemu_host_page_size,
500: real_end - qemu_host_page_size, real_end,
501: prot, flags, fd,
502: offset + real_end - qemu_host_page_size - start);
503: if (ret == -1)
1.1.1.5 root 504: goto fail;
1.1.1.4 root 505: real_end -= qemu_host_page_size;
506: }
507:
508: /* map the middle (easier) */
509: if (real_start < real_end) {
510: void *p;
511: unsigned long offset1;
512: if (flags & MAP_ANONYMOUS)
513: offset1 = 0;
514: else
515: offset1 = offset + real_start - start;
516: p = mmap(g2h(real_start), real_end - real_start,
517: prot, flags, fd, offset1);
518: if (p == MAP_FAILED)
1.1.1.5 root 519: goto fail;
1.1 root 520: }
521: }
522: the_end1:
523: page_set_flags(start, start + len, prot | PAGE_VALID);
524: the_end:
525: #ifdef DEBUG_MMAP
1.1.1.6 ! root 526: printf("ret=0x" TARGET_ABI_FMT_lx "\n", start);
1.1 root 527: page_dump(stdout);
528: printf("\n");
529: #endif
1.1.1.5 root 530: mmap_unlock();
1.1 root 531: return start;
1.1.1.5 root 532: fail:
533: mmap_unlock();
534: return -1;
1.1 root 535: }
536:
1.1.1.4 root 537: int target_munmap(abi_ulong start, abi_ulong len)
1.1 root 538: {
1.1.1.4 root 539: abi_ulong end, real_start, real_end, addr;
1.1 root 540: int prot, ret;
541:
542: #ifdef DEBUG_MMAP
1.1.1.6 ! root 543: printf("munmap: start=0x" TARGET_ABI_FMT_lx " len=0x"
! 544: TARGET_ABI_FMT_lx "\n",
! 545: start, len);
1.1 root 546: #endif
547: if (start & ~TARGET_PAGE_MASK)
548: return -EINVAL;
549: len = TARGET_PAGE_ALIGN(len);
550: if (len == 0)
551: return -EINVAL;
1.1.1.5 root 552: mmap_lock();
1.1 root 553: end = start + len;
1.1.1.2 root 554: real_start = start & qemu_host_page_mask;
555: real_end = HOST_PAGE_ALIGN(end);
1.1 root 556:
1.1.1.2 root 557: if (start > real_start) {
1.1 root 558: /* handle host page containing start */
559: prot = 0;
1.1.1.2 root 560: for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
1.1 root 561: prot |= page_get_flags(addr);
562: }
1.1.1.2 root 563: if (real_end == real_start + qemu_host_page_size) {
564: for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
1.1 root 565: prot |= page_get_flags(addr);
566: }
1.1.1.2 root 567: end = real_end;
1.1 root 568: }
569: if (prot != 0)
1.1.1.2 root 570: real_start += qemu_host_page_size;
1.1 root 571: }
1.1.1.2 root 572: if (end < real_end) {
1.1 root 573: prot = 0;
1.1.1.2 root 574: for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
1.1 root 575: prot |= page_get_flags(addr);
576: }
577: if (prot != 0)
1.1.1.2 root 578: real_end -= qemu_host_page_size;
1.1 root 579: }
1.1.1.4 root 580:
1.1.1.5 root 581: ret = 0;
1.1 root 582: /* unmap what we can */
1.1.1.2 root 583: if (real_start < real_end) {
1.1.1.4 root 584: ret = munmap(g2h(real_start), real_end - real_start);
1.1 root 585: }
586:
1.1.1.5 root 587: if (ret == 0)
588: page_set_flags(start, start + len, 0);
589: mmap_unlock();
590: return ret;
1.1 root 591: }
592:
1.1.1.4 root 593: abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
594: abi_ulong new_size, unsigned long flags,
595: abi_ulong new_addr)
1.1 root 596: {
597: int prot;
1.1.1.5 root 598: void *host_addr;
599:
600: mmap_lock();
601:
602: if (flags & MREMAP_FIXED)
603: host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
604: old_size, new_size,
605: flags,
606: new_addr);
607: else if (flags & MREMAP_MAYMOVE) {
608: abi_ulong mmap_start;
609:
610: mmap_start = mmap_find_vma(0, new_size);
1.1 root 611:
1.1.1.5 root 612: if (mmap_start == -1) {
613: errno = ENOMEM;
614: host_addr = MAP_FAILED;
615: } else
616: host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
617: old_size, new_size,
618: flags | MREMAP_FIXED,
619: g2h(mmap_start));
620: } else {
621: host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
622: /* Check if address fits target address space */
623: if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
624: /* Revert mremap() changes */
625: host_addr = mremap(g2h(old_addr), new_size, old_size, flags);
626: errno = ENOMEM;
627: host_addr = MAP_FAILED;
628: }
629: }
630:
631: if (host_addr == MAP_FAILED) {
632: new_addr = -1;
633: } else {
634: new_addr = h2g(host_addr);
635: prot = page_get_flags(old_addr);
636: page_set_flags(old_addr, old_addr + old_size, 0);
637: page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
638: }
639: mmap_unlock();
1.1 root 640: return new_addr;
641: }
642:
1.1.1.4 root 643: int target_msync(abi_ulong start, abi_ulong len, int flags)
1.1 root 644: {
1.1.1.4 root 645: abi_ulong end;
1.1 root 646:
647: if (start & ~TARGET_PAGE_MASK)
648: return -EINVAL;
649: len = TARGET_PAGE_ALIGN(len);
650: end = start + len;
651: if (end < start)
652: return -EINVAL;
653: if (end == start)
654: return 0;
1.1.1.4 root 655:
1.1 root 656: start &= qemu_host_page_mask;
1.1.1.2 root 657: return msync(g2h(start), end - start, flags);
1.1 root 658: }
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