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19#include "qemu/osdep.h"
20#include <sys/mman.h>
21#include <linux/mman.h>
22#include <linux/unistd.h>
23
24#include "qemu.h"
25#include "qemu-common.h"
26#include "translate-all.h"
27
28
29
30static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
31static __thread int mmap_lock_count;
32
33void mmap_lock(void)
34{
35 if (mmap_lock_count++ == 0) {
36 pthread_mutex_lock(&mmap_mutex);
37 }
38}
39
40void mmap_unlock(void)
41{
42 if (--mmap_lock_count == 0) {
43 pthread_mutex_unlock(&mmap_mutex);
44 }
45}
46
47
48void mmap_fork_start(void)
49{
50 if (mmap_lock_count)
51 abort();
52 pthread_mutex_lock(&mmap_mutex);
53}
54
55void mmap_fork_end(int child)
56{
57 if (child)
58 pthread_mutex_init(&mmap_mutex, NULL);
59 else
60 pthread_mutex_unlock(&mmap_mutex);
61}
62
63
64int target_mprotect(abi_ulong start, abi_ulong len, int prot)
65{
66 abi_ulong end, host_start, host_end, addr;
67 int prot1, ret;
68
69#ifdef DEBUG_MMAP
70 printf("mprotect: start=0x" TARGET_ABI_FMT_lx
71 "len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c\n", start, len,
72 prot & PROT_READ ? 'r' : '-',
73 prot & PROT_WRITE ? 'w' : '-',
74 prot & PROT_EXEC ? 'x' : '-');
75#endif
76
77 if ((start & ~TARGET_PAGE_MASK) != 0)
78 return -EINVAL;
79 len = TARGET_PAGE_ALIGN(len);
80 end = start + len;
81 if (end < start)
82 return -EINVAL;
83 prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
84 if (len == 0)
85 return 0;
86
87 mmap_lock();
88 host_start = start & qemu_host_page_mask;
89 host_end = HOST_PAGE_ALIGN(end);
90 if (start > host_start) {
91
92 prot1 = prot;
93 for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
94 prot1 |= page_get_flags(addr);
95 }
96 if (host_end == host_start + qemu_host_page_size) {
97 for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
98 prot1 |= page_get_flags(addr);
99 }
100 end = host_end;
101 }
102 ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS);
103 if (ret != 0)
104 goto error;
105 host_start += qemu_host_page_size;
106 }
107 if (end < host_end) {
108 prot1 = prot;
109 for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
110 prot1 |= page_get_flags(addr);
111 }
112 ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size,
113 prot1 & PAGE_BITS);
114 if (ret != 0)
115 goto error;
116 host_end -= qemu_host_page_size;
117 }
118
119
120 if (host_start < host_end) {
121 ret = mprotect(g2h(host_start), host_end - host_start, prot);
122 if (ret != 0)
123 goto error;
124 }
125 page_set_flags(start, start + len, prot | PAGE_VALID);
126 mmap_unlock();
127 return 0;
128error:
129 mmap_unlock();
130 return ret;
131}
132
133
134static int mmap_frag(abi_ulong real_start,
135 abi_ulong start, abi_ulong end,
136 int prot, int flags, int fd, abi_ulong offset)
137{
138 abi_ulong real_end, addr;
139 void *host_start;
140 int prot1, prot_new;
141
142 real_end = real_start + qemu_host_page_size;
143 host_start = g2h(real_start);
144
145
146 prot1 = 0;
147 for(addr = real_start; addr < real_end; addr++) {
148 if (addr < start || addr >= end)
149 prot1 |= page_get_flags(addr);
150 }
151
152 if (prot1 == 0) {
153
154 void *p = mmap(host_start, qemu_host_page_size, prot,
155 flags | MAP_ANONYMOUS, -1, 0);
156 if (p == MAP_FAILED)
157 return -1;
158 prot1 = prot;
159 }
160 prot1 &= PAGE_BITS;
161
162 prot_new = prot | prot1;
163 if (!(flags & MAP_ANONYMOUS)) {
164
165
166 if ((flags & MAP_TYPE) == MAP_SHARED &&
167 (prot & PROT_WRITE))
168 return -1;
169
170
171 if (!(prot1 & PROT_WRITE))
172 mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
173
174
175 if (pread(fd, g2h(start), end - start, offset) == -1)
176 return -1;
177
178
179 if (prot_new != (prot1 | PROT_WRITE))
180 mprotect(host_start, qemu_host_page_size, prot_new);
181 } else {
182 if (prot_new != prot1) {
183 mprotect(host_start, qemu_host_page_size, prot_new);
184 }
185 if (prot_new & PROT_WRITE) {
186 memset(g2h(start), 0, end - start);
187 }
188 }
189 return 0;
190}
191
192#if HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
193# define TASK_UNMAPPED_BASE (1ul << 38)
194#elif defined(__CYGWIN__)
195
196# define TASK_UNMAPPED_BASE 0x18000000
197#else
198# define TASK_UNMAPPED_BASE 0x40000000
199#endif
200abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;
201
202unsigned long last_brk;
203
204
205
206static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
207{
208 abi_ulong addr;
209 abi_ulong end_addr;
210 int prot;
211 int looped = 0;
212
213 if (size > reserved_va) {
214 return (abi_ulong)-1;
215 }
216
217 size = HOST_PAGE_ALIGN(size);
218 end_addr = start + size;
219 if (end_addr > reserved_va) {
220 end_addr = reserved_va;
221 }
222 addr = end_addr - qemu_host_page_size;
223
224 while (1) {
225 if (addr > end_addr) {
226 if (looped) {
227 return (abi_ulong)-1;
228 }
229 end_addr = reserved_va;
230 addr = end_addr - qemu_host_page_size;
231 looped = 1;
232 continue;
233 }
234 prot = page_get_flags(addr);
235 if (prot) {
236 end_addr = addr;
237 }
238 if (addr + size == end_addr) {
239 break;
240 }
241 addr -= qemu_host_page_size;
242 }
243
244 if (start == mmap_next_start) {
245 mmap_next_start = addr;
246 }
247
248 return addr;
249}
250
251
252
253
254
255
256
257abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
258{
259 void *ptr, *prev;
260 abi_ulong addr;
261 int wrapped, repeat;
262
263
264 if (start == 0) {
265 start = mmap_next_start;
266 } else {
267 start &= qemu_host_page_mask;
268 }
269
270 size = HOST_PAGE_ALIGN(size);
271
272 if (reserved_va) {
273 return mmap_find_vma_reserved(start, size);
274 }
275
276 addr = start;
277 wrapped = repeat = 0;
278 prev = 0;
279
280 for (;; prev = ptr) {
281
282
283
284
285
286
287
288 ptr = mmap(g2h(addr), size, PROT_NONE,
289 MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
290
291
292 if (ptr == MAP_FAILED) {
293 return (abi_ulong)-1;
294 }
295
296
297
298 repeat = (ptr == prev ? repeat + 1 : 0);
299
300 if (h2g_valid(ptr + size - 1)) {
301 addr = h2g(ptr);
302
303 if ((addr & ~TARGET_PAGE_MASK) == 0) {
304
305 if (start == mmap_next_start && addr >= TASK_UNMAPPED_BASE) {
306 mmap_next_start = addr + size;
307 }
308 return addr;
309 }
310
311
312 switch (repeat) {
313 case 0:
314
315
316
317 addr = TARGET_PAGE_ALIGN(addr);
318 break;
319 case 1:
320
321
322 addr &= TARGET_PAGE_MASK;
323 break;
324 case 2:
325
326 addr = 0;
327 break;
328 default:
329
330 addr = -1;
331 break;
332 }
333 } else {
334
335
336 addr = (repeat ? -1 : 0);
337 }
338
339
340 munmap(ptr, size);
341
342
343 if (addr == (abi_ulong)-1) {
344 return (abi_ulong)-1;
345 } else if (addr == 0) {
346 if (wrapped) {
347 return (abi_ulong)-1;
348 }
349 wrapped = 1;
350
351
352 addr = (mmap_min_addr > TARGET_PAGE_SIZE
353 ? TARGET_PAGE_ALIGN(mmap_min_addr)
354 : TARGET_PAGE_SIZE);
355 } else if (wrapped && addr >= start) {
356 return (abi_ulong)-1;
357 }
358 }
359}
360
361
362abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
363 int flags, int fd, abi_ulong offset)
364{
365 abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
366
367 mmap_lock();
368#ifdef DEBUG_MMAP
369 {
370 printf("mmap: start=0x" TARGET_ABI_FMT_lx
371 " len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c flags=",
372 start, len,
373 prot & PROT_READ ? 'r' : '-',
374 prot & PROT_WRITE ? 'w' : '-',
375 prot & PROT_EXEC ? 'x' : '-');
376 if (flags & MAP_FIXED)
377 printf("MAP_FIXED ");
378 if (flags & MAP_ANONYMOUS)
379 printf("MAP_ANON ");
380 switch(flags & MAP_TYPE) {
381 case MAP_PRIVATE:
382 printf("MAP_PRIVATE ");
383 break;
384 case MAP_SHARED:
385 printf("MAP_SHARED ");
386 break;
387 default:
388 printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
389 break;
390 }
391 printf("fd=%d offset=" TARGET_ABI_FMT_lx "\n", fd, offset);
392 }
393#endif
394
395 if (offset & ~TARGET_PAGE_MASK) {
396 errno = EINVAL;
397 goto fail;
398 }
399
400 len = TARGET_PAGE_ALIGN(len);
401 if (len == 0)
402 goto the_end;
403 real_start = start & qemu_host_page_mask;
404 host_offset = offset & qemu_host_page_mask;
405
406
407
408 if (!(flags & MAP_FIXED)) {
409 host_len = len + offset - host_offset;
410 host_len = HOST_PAGE_ALIGN(host_len);
411 start = mmap_find_vma(real_start, host_len);
412 if (start == (abi_ulong)-1) {
413 errno = ENOMEM;
414 goto fail;
415 }
416 }
417
418
419
420
421
422
423
424
425
426
427
428
429
430 if ((qemu_real_host_page_size < TARGET_PAGE_SIZE)
431 && !(flags & MAP_ANONYMOUS)) {
432 struct stat sb;
433
434 if (fstat (fd, &sb) == -1)
435 goto fail;
436
437
438 if (offset + len > sb.st_size) {
439
440
441
442 len = REAL_HOST_PAGE_ALIGN(sb.st_size - offset);
443 }
444 }
445
446 if (!(flags & MAP_FIXED)) {
447 unsigned long host_start;
448 void *p;
449
450 host_len = len + offset - host_offset;
451 host_len = HOST_PAGE_ALIGN(host_len);
452
453
454
455
456 p = mmap(g2h(start), host_len, prot,
457 flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
458 if (p == MAP_FAILED)
459 goto fail;
460
461 host_start = (unsigned long)p;
462 if (!(flags & MAP_ANONYMOUS)) {
463 p = mmap(g2h(start), len, prot,
464 flags | MAP_FIXED, fd, host_offset);
465 if (p == MAP_FAILED) {
466 munmap(g2h(start), host_len);
467 goto fail;
468 }
469 host_start += offset - host_offset;
470 }
471 start = h2g(host_start);
472 } else {
473 if (start & ~TARGET_PAGE_MASK) {
474 errno = EINVAL;
475 goto fail;
476 }
477 end = start + len;
478 real_end = HOST_PAGE_ALIGN(end);
479
480
481
482
483
484
485 if ((unsigned long)start + len - 1 > (abi_ulong) -1) {
486 errno = EINVAL;
487 goto fail;
488 }
489
490
491
492 if (!(flags & MAP_ANONYMOUS) &&
493 (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
494
495
496 if ((flags & MAP_TYPE) == MAP_SHARED &&
497 (prot & PROT_WRITE)) {
498 errno = EINVAL;
499 goto fail;
500 }
501 retaddr = target_mmap(start, len, prot | PROT_WRITE,
502 MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
503 -1, 0);
504 if (retaddr == -1)
505 goto fail;
506 if (pread(fd, g2h(start), len, offset) == -1)
507 goto fail;
508 if (!(prot & PROT_WRITE)) {
509 ret = target_mprotect(start, len, prot);
510 assert(ret == 0);
511 }
512 goto the_end;
513 }
514
515
516 if (start > real_start) {
517 if (real_end == real_start + qemu_host_page_size) {
518
519 ret = mmap_frag(real_start, start, end,
520 prot, flags, fd, offset);
521 if (ret == -1)
522 goto fail;
523 goto the_end1;
524 }
525 ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
526 prot, flags, fd, offset);
527 if (ret == -1)
528 goto fail;
529 real_start += qemu_host_page_size;
530 }
531
532 if (end < real_end) {
533 ret = mmap_frag(real_end - qemu_host_page_size,
534 real_end - qemu_host_page_size, end,
535 prot, flags, fd,
536 offset + real_end - qemu_host_page_size - start);
537 if (ret == -1)
538 goto fail;
539 real_end -= qemu_host_page_size;
540 }
541
542
543 if (real_start < real_end) {
544 void *p;
545 unsigned long offset1;
546 if (flags & MAP_ANONYMOUS)
547 offset1 = 0;
548 else
549 offset1 = offset + real_start - start;
550 p = mmap(g2h(real_start), real_end - real_start,
551 prot, flags, fd, offset1);
552 if (p == MAP_FAILED)
553 goto fail;
554 }
555 }
556 the_end1:
557 page_set_flags(start, start + len, prot | PAGE_VALID);
558 the_end:
559#ifdef DEBUG_MMAP
560 printf("ret=0x" TARGET_ABI_FMT_lx "\n", start);
561 page_dump(stdout);
562 printf("\n");
563#endif
564 tb_invalidate_phys_range(start, start + len);
565 mmap_unlock();
566 return start;
567fail:
568 mmap_unlock();
569 return -1;
570}
571
572static void mmap_reserve(abi_ulong start, abi_ulong size)
573{
574 abi_ulong real_start;
575 abi_ulong real_end;
576 abi_ulong addr;
577 abi_ulong end;
578 int prot;
579
580 real_start = start & qemu_host_page_mask;
581 real_end = HOST_PAGE_ALIGN(start + size);
582 end = start + size;
583 if (start > real_start) {
584
585 prot = 0;
586 for (addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
587 prot |= page_get_flags(addr);
588 }
589 if (real_end == real_start + qemu_host_page_size) {
590 for (addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
591 prot |= page_get_flags(addr);
592 }
593 end = real_end;
594 }
595 if (prot != 0)
596 real_start += qemu_host_page_size;
597 }
598 if (end < real_end) {
599 prot = 0;
600 for (addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
601 prot |= page_get_flags(addr);
602 }
603 if (prot != 0)
604 real_end -= qemu_host_page_size;
605 }
606 if (real_start != real_end) {
607 mmap(g2h(real_start), real_end - real_start, PROT_NONE,
608 MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE,
609 -1, 0);
610 }
611}
612
613int target_munmap(abi_ulong start, abi_ulong len)
614{
615 abi_ulong end, real_start, real_end, addr;
616 int prot, ret;
617
618#ifdef DEBUG_MMAP
619 printf("munmap: start=0x" TARGET_ABI_FMT_lx " len=0x"
620 TARGET_ABI_FMT_lx "\n",
621 start, len);
622#endif
623 if (start & ~TARGET_PAGE_MASK)
624 return -EINVAL;
625 len = TARGET_PAGE_ALIGN(len);
626 if (len == 0)
627 return -EINVAL;
628 mmap_lock();
629 end = start + len;
630 real_start = start & qemu_host_page_mask;
631 real_end = HOST_PAGE_ALIGN(end);
632
633 if (start > real_start) {
634
635 prot = 0;
636 for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
637 prot |= page_get_flags(addr);
638 }
639 if (real_end == real_start + qemu_host_page_size) {
640 for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
641 prot |= page_get_flags(addr);
642 }
643 end = real_end;
644 }
645 if (prot != 0)
646 real_start += qemu_host_page_size;
647 }
648 if (end < real_end) {
649 prot = 0;
650 for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
651 prot |= page_get_flags(addr);
652 }
653 if (prot != 0)
654 real_end -= qemu_host_page_size;
655 }
656
657 ret = 0;
658
659 if (real_start < real_end) {
660 if (reserved_va) {
661 mmap_reserve(real_start, real_end - real_start);
662 } else {
663 ret = munmap(g2h(real_start), real_end - real_start);
664 }
665 }
666
667 if (ret == 0) {
668 page_set_flags(start, start + len, 0);
669 tb_invalidate_phys_range(start, start + len);
670 }
671 mmap_unlock();
672 return ret;
673}
674
675abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
676 abi_ulong new_size, unsigned long flags,
677 abi_ulong new_addr)
678{
679 int prot;
680 void *host_addr;
681
682 mmap_lock();
683
684 if (flags & MREMAP_FIXED) {
685 host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
686 old_size, new_size,
687 flags,
688 g2h(new_addr));
689
690 if (reserved_va && host_addr != MAP_FAILED) {
691
692
693 mmap_reserve(old_addr, old_size);
694 }
695 } else if (flags & MREMAP_MAYMOVE) {
696 abi_ulong mmap_start;
697
698 mmap_start = mmap_find_vma(0, new_size);
699
700 if (mmap_start == -1) {
701 errno = ENOMEM;
702 host_addr = MAP_FAILED;
703 } else {
704 host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
705 old_size, new_size,
706 flags | MREMAP_FIXED,
707 g2h(mmap_start));
708 if (reserved_va) {
709 mmap_reserve(old_addr, old_size);
710 }
711 }
712 } else {
713 int prot = 0;
714 if (reserved_va && old_size < new_size) {
715 abi_ulong addr;
716 for (addr = old_addr + old_size;
717 addr < old_addr + new_size;
718 addr++) {
719 prot |= page_get_flags(addr);
720 }
721 }
722 if (prot == 0) {
723 host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
724 if (host_addr != MAP_FAILED && reserved_va && old_size > new_size) {
725 mmap_reserve(old_addr + old_size, new_size - old_size);
726 }
727 } else {
728 errno = ENOMEM;
729 host_addr = MAP_FAILED;
730 }
731
732 if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
733
734 host_addr = mremap(g2h(old_addr), new_size, old_size, flags);
735 errno = ENOMEM;
736 host_addr = MAP_FAILED;
737 }
738 }
739
740 if (host_addr == MAP_FAILED) {
741 new_addr = -1;
742 } else {
743 new_addr = h2g(host_addr);
744 prot = page_get_flags(old_addr);
745 page_set_flags(old_addr, old_addr + old_size, 0);
746 page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
747 }
748 tb_invalidate_phys_range(new_addr, new_addr + new_size);
749 mmap_unlock();
750 return new_addr;
751}
752
753int target_msync(abi_ulong start, abi_ulong len, int flags)
754{
755 abi_ulong end;
756
757 if (start & ~TARGET_PAGE_MASK)
758 return -EINVAL;
759 len = TARGET_PAGE_ALIGN(len);
760 end = start + len;
761 if (end < start)
762 return -EINVAL;
763 if (end == start)
764 return 0;
765
766 start &= qemu_host_page_mask;
767 return msync(g2h(start), end - start, flags);
768}
769