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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:
1.1.1.7 ! root 36: #if defined(CONFIG_USE_NPTL)
! 37: static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
! 38: static __thread int mmap_lock_count;
1.1.1.5 root 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:
1.1.1.7 ! root 276: /*
! 277: * Find and reserve a free memory area of size 'size'. The search
! 278: * starts at 'start'.
! 279: * It must be called with mmap_lock() held.
! 280: * Return -1 if error.
! 281: */
1.1.1.6 root 282: abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
1.1.1.4 root 283: {
1.1.1.7 ! root 284: void *ptr;
! 285: abi_ulong addr;
1.1.1.4 root 286:
287: size = HOST_PAGE_ALIGN(size);
1.1.1.7 ! root 288: start &= qemu_host_page_mask;
! 289:
! 290: /* If 'start' == 0, then a default start address is used. */
! 291: if (start == 0)
! 292: start = mmap_next_start;
! 293:
1.1.1.4 root 294: addr = start;
1.1.1.7 ! root 295:
1.1.1.4 root 296: for(;;) {
1.1.1.7 ! root 297: /*
! 298: * Reserve needed memory area to avoid a race.
! 299: * It should be discarded using:
! 300: * - mmap() with MAP_FIXED flag
! 301: * - mremap() with MREMAP_FIXED flag
! 302: * - shmat() with SHM_REMAP flag
! 303: */
! 304: ptr = mmap((void *)(unsigned long)addr, size, PROT_NONE,
! 305: MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
! 306:
! 307: /* ENOMEM, if host address space has no memory */
! 308: if (ptr == MAP_FAILED)
! 309: return (abi_ulong)-1;
! 310:
! 311: /* If address fits target address space we've found what we need */
! 312: if ((unsigned long)ptr + size - 1 <= (abi_ulong)-1)
1.1.1.4 root 313: break;
1.1.1.7 ! root 314:
! 315: /* Unmap and try again with new page */
! 316: munmap(ptr, size);
1.1.1.4 root 317: addr += qemu_host_page_size;
1.1.1.7 ! root 318:
! 319: /* ENOMEM if we check whole of target address space */
! 320: if (addr == start)
1.1.1.4 root 321: return (abi_ulong)-1;
322: }
1.1.1.7 ! root 323:
! 324: /* Update default start address */
! 325: if (start == mmap_next_start)
! 326: mmap_next_start = (unsigned long)ptr + size;
! 327:
! 328: return h2g(ptr);
1.1.1.4 root 329: }
330:
1.1 root 331: /* NOTE: all the constants are the HOST ones */
1.1.1.4 root 332: abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
333: int flags, int fd, abi_ulong offset)
1.1 root 334: {
1.1.1.4 root 335: abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
336: unsigned long host_start;
1.1 root 337:
1.1.1.5 root 338: mmap_lock();
1.1 root 339: #ifdef DEBUG_MMAP
340: {
1.1.1.6 root 341: printf("mmap: start=0x" TARGET_ABI_FMT_lx
342: " len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c flags=",
1.1.1.4 root 343: start, len,
1.1 root 344: prot & PROT_READ ? 'r' : '-',
345: prot & PROT_WRITE ? 'w' : '-',
346: prot & PROT_EXEC ? 'x' : '-');
347: if (flags & MAP_FIXED)
348: printf("MAP_FIXED ");
349: if (flags & MAP_ANONYMOUS)
350: printf("MAP_ANON ");
351: switch(flags & MAP_TYPE) {
352: case MAP_PRIVATE:
353: printf("MAP_PRIVATE ");
354: break;
355: case MAP_SHARED:
356: printf("MAP_SHARED ");
357: break;
358: default:
359: printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
360: break;
361: }
1.1.1.6 root 362: printf("fd=%d offset=" TARGET_ABI_FMT_lx "\n", fd, offset);
1.1 root 363: }
364: #endif
365:
1.1.1.2 root 366: if (offset & ~TARGET_PAGE_MASK) {
367: errno = EINVAL;
1.1.1.5 root 368: goto fail;
1.1.1.2 root 369: }
1.1 root 370:
371: len = TARGET_PAGE_ALIGN(len);
372: if (len == 0)
1.1.1.5 root 373: goto the_end;
1.1.1.2 root 374: real_start = start & qemu_host_page_mask;
1.1 root 375:
1.1.1.5 root 376: /* When mapping files into a memory area larger than the file, accesses
377: to pages beyond the file size will cause a SIGBUS.
378:
379: For example, if mmaping a file of 100 bytes on a host with 4K pages
380: emulating a target with 8K pages, the target expects to be able to
381: access the first 8K. But the host will trap us on any access beyond
382: 4K.
383:
384: When emulating a target with a larger page-size than the hosts, we
385: may need to truncate file maps at EOF and add extra anonymous pages
386: up to the targets page boundary. */
387:
388: if ((qemu_real_host_page_size < TARGET_PAGE_SIZE)
389: && !(flags & MAP_ANONYMOUS)) {
390: struct stat sb;
391:
392: if (fstat (fd, &sb) == -1)
393: goto fail;
394:
395: /* Are we trying to create a map beyond EOF?. */
396: if (offset + len > sb.st_size) {
397: /* If so, truncate the file map at eof aligned with
398: the hosts real pagesize. Additional anonymous maps
399: will be created beyond EOF. */
400: len = (sb.st_size - offset);
401: len += qemu_real_host_page_size - 1;
402: len &= ~(qemu_real_host_page_size - 1);
403: }
404: }
405:
1.1 root 406: if (!(flags & MAP_FIXED)) {
1.1.1.4 root 407: abi_ulong mmap_start;
408: void *p;
409: host_offset = offset & qemu_host_page_mask;
410: host_len = len + offset - host_offset;
411: host_len = HOST_PAGE_ALIGN(host_len);
412: mmap_start = mmap_find_vma(real_start, host_len);
413: if (mmap_start == (abi_ulong)-1) {
414: errno = ENOMEM;
1.1.1.5 root 415: goto fail;
1.1 root 416: }
1.1.1.4 root 417: /* Note: we prefer to control the mapping address. It is
418: especially important if qemu_host_page_size >
419: qemu_real_host_page_size */
420: p = mmap(g2h(mmap_start),
1.1.1.5 root 421: host_len, prot, flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
1.1.1.4 root 422: if (p == MAP_FAILED)
1.1.1.5 root 423: goto fail;
1.1.1.4 root 424: /* update start so that it points to the file position at 'offset' */
425: host_start = (unsigned long)p;
1.1.1.5 root 426: if (!(flags & MAP_ANONYMOUS)) {
427: p = mmap(g2h(mmap_start), len, prot,
428: flags | MAP_FIXED, fd, host_offset);
1.1.1.4 root 429: host_start += offset - host_offset;
1.1.1.5 root 430: }
1.1.1.4 root 431: start = h2g(host_start);
432: } else {
1.1.1.5 root 433: int flg;
434: target_ulong addr;
435:
1.1.1.4 root 436: if (start & ~TARGET_PAGE_MASK) {
1.1.1.2 root 437: errno = EINVAL;
1.1.1.5 root 438: goto fail;
1.1.1.2 root 439: }
1.1.1.4 root 440: end = start + len;
441: real_end = HOST_PAGE_ALIGN(end);
1.1.1.5 root 442:
443: /*
444: * Test if requested memory area fits target address space
445: * It can fail only on 64-bit host with 32-bit target.
446: * On any other target/host host mmap() handles this error correctly.
447: */
448: if ((unsigned long)start + len - 1 > (abi_ulong) -1) {
449: errno = EINVAL;
450: goto fail;
451: }
452:
453: for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) {
454: flg = page_get_flags(addr);
455: if (flg & PAGE_RESERVED) {
456: errno = ENXIO;
457: goto fail;
458: }
459: }
460:
1.1.1.4 root 461: /* worst case: we cannot map the file because the offset is not
462: aligned, so we read it */
463: if (!(flags & MAP_ANONYMOUS) &&
464: (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
465: /* msync() won't work here, so we return an error if write is
466: possible while it is a shared mapping */
467: if ((flags & MAP_TYPE) == MAP_SHARED &&
468: (prot & PROT_WRITE)) {
469: errno = EINVAL;
1.1.1.5 root 470: goto fail;
1.1.1.4 root 471: }
472: retaddr = target_mmap(start, len, prot | PROT_WRITE,
473: MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
474: -1, 0);
475: if (retaddr == -1)
1.1.1.5 root 476: goto fail;
1.1.1.4 root 477: pread(fd, g2h(start), len, offset);
478: if (!(prot & PROT_WRITE)) {
479: ret = target_mprotect(start, len, prot);
1.1.1.5 root 480: if (ret != 0) {
481: start = ret;
482: goto the_end;
483: }
1.1.1.4 root 484: }
485: goto the_end;
1.1 root 486: }
1.1.1.4 root 487:
488: /* handle the start of the mapping */
489: if (start > real_start) {
490: if (real_end == real_start + qemu_host_page_size) {
491: /* one single host page */
492: ret = mmap_frag(real_start, start, end,
493: prot, flags, fd, offset);
494: if (ret == -1)
1.1.1.5 root 495: goto fail;
1.1.1.4 root 496: goto the_end1;
497: }
498: ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
1.1 root 499: prot, flags, fd, offset);
500: if (ret == -1)
1.1.1.5 root 501: goto fail;
1.1.1.4 root 502: real_start += qemu_host_page_size;
503: }
504: /* handle the end of the mapping */
505: if (end < real_end) {
506: ret = mmap_frag(real_end - qemu_host_page_size,
507: real_end - qemu_host_page_size, real_end,
508: prot, flags, fd,
509: offset + real_end - qemu_host_page_size - start);
510: if (ret == -1)
1.1.1.5 root 511: goto fail;
1.1.1.4 root 512: real_end -= qemu_host_page_size;
513: }
514:
515: /* map the middle (easier) */
516: if (real_start < real_end) {
517: void *p;
518: unsigned long offset1;
519: if (flags & MAP_ANONYMOUS)
520: offset1 = 0;
521: else
522: offset1 = offset + real_start - start;
523: p = mmap(g2h(real_start), real_end - real_start,
524: prot, flags, fd, offset1);
525: if (p == MAP_FAILED)
1.1.1.5 root 526: goto fail;
1.1 root 527: }
528: }
529: the_end1:
530: page_set_flags(start, start + len, prot | PAGE_VALID);
531: the_end:
532: #ifdef DEBUG_MMAP
1.1.1.6 root 533: printf("ret=0x" TARGET_ABI_FMT_lx "\n", start);
1.1 root 534: page_dump(stdout);
535: printf("\n");
536: #endif
1.1.1.5 root 537: mmap_unlock();
1.1 root 538: return start;
1.1.1.5 root 539: fail:
540: mmap_unlock();
541: return -1;
1.1 root 542: }
543:
1.1.1.4 root 544: int target_munmap(abi_ulong start, abi_ulong len)
1.1 root 545: {
1.1.1.4 root 546: abi_ulong end, real_start, real_end, addr;
1.1 root 547: int prot, ret;
548:
549: #ifdef DEBUG_MMAP
1.1.1.6 root 550: printf("munmap: start=0x" TARGET_ABI_FMT_lx " len=0x"
551: TARGET_ABI_FMT_lx "\n",
552: start, len);
1.1 root 553: #endif
554: if (start & ~TARGET_PAGE_MASK)
555: return -EINVAL;
556: len = TARGET_PAGE_ALIGN(len);
557: if (len == 0)
558: return -EINVAL;
1.1.1.5 root 559: mmap_lock();
1.1 root 560: end = start + len;
1.1.1.2 root 561: real_start = start & qemu_host_page_mask;
562: real_end = HOST_PAGE_ALIGN(end);
1.1 root 563:
1.1.1.2 root 564: if (start > real_start) {
1.1 root 565: /* handle host page containing start */
566: prot = 0;
1.1.1.2 root 567: for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
1.1 root 568: prot |= page_get_flags(addr);
569: }
1.1.1.2 root 570: if (real_end == real_start + qemu_host_page_size) {
571: for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
1.1 root 572: prot |= page_get_flags(addr);
573: }
1.1.1.2 root 574: end = real_end;
1.1 root 575: }
576: if (prot != 0)
1.1.1.2 root 577: real_start += qemu_host_page_size;
1.1 root 578: }
1.1.1.2 root 579: if (end < real_end) {
1.1 root 580: prot = 0;
1.1.1.2 root 581: for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
1.1 root 582: prot |= page_get_flags(addr);
583: }
584: if (prot != 0)
1.1.1.2 root 585: real_end -= qemu_host_page_size;
1.1 root 586: }
1.1.1.4 root 587:
1.1.1.5 root 588: ret = 0;
1.1 root 589: /* unmap what we can */
1.1.1.2 root 590: if (real_start < real_end) {
1.1.1.4 root 591: ret = munmap(g2h(real_start), real_end - real_start);
1.1 root 592: }
593:
1.1.1.5 root 594: if (ret == 0)
595: page_set_flags(start, start + len, 0);
596: mmap_unlock();
597: return ret;
1.1 root 598: }
599:
1.1.1.4 root 600: abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
601: abi_ulong new_size, unsigned long flags,
602: abi_ulong new_addr)
1.1 root 603: {
604: int prot;
1.1.1.5 root 605: void *host_addr;
606:
607: mmap_lock();
608:
609: if (flags & MREMAP_FIXED)
610: host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
611: old_size, new_size,
612: flags,
613: new_addr);
614: else if (flags & MREMAP_MAYMOVE) {
615: abi_ulong mmap_start;
616:
617: mmap_start = mmap_find_vma(0, new_size);
1.1 root 618:
1.1.1.5 root 619: if (mmap_start == -1) {
620: errno = ENOMEM;
621: host_addr = MAP_FAILED;
622: } else
623: host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
624: old_size, new_size,
625: flags | MREMAP_FIXED,
626: g2h(mmap_start));
627: } else {
628: host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
629: /* Check if address fits target address space */
630: if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
631: /* Revert mremap() changes */
632: host_addr = mremap(g2h(old_addr), new_size, old_size, flags);
633: errno = ENOMEM;
634: host_addr = MAP_FAILED;
635: }
636: }
637:
638: if (host_addr == MAP_FAILED) {
639: new_addr = -1;
640: } else {
641: new_addr = h2g(host_addr);
642: prot = page_get_flags(old_addr);
643: page_set_flags(old_addr, old_addr + old_size, 0);
644: page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
645: }
646: mmap_unlock();
1.1 root 647: return new_addr;
648: }
649:
1.1.1.4 root 650: int target_msync(abi_ulong start, abi_ulong len, int flags)
1.1 root 651: {
1.1.1.4 root 652: abi_ulong end;
1.1 root 653:
654: if (start & ~TARGET_PAGE_MASK)
655: return -EINVAL;
656: len = TARGET_PAGE_ALIGN(len);
657: end = start + len;
658: if (end < start)
659: return -EINVAL;
660: if (end == start)
661: return 0;
1.1.1.4 root 662:
1.1 root 663: start &= qemu_host_page_mask;
1.1.1.2 root 664: return msync(g2h(start), end - start, flags);
1.1 root 665: }
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