blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 1 | /* |
| 2 | * mmap support for qemu |
| 3 | * |
| 4 | * Copyright (c) 2003 - 2008 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 |
Blue Swirl | 8167ee8 | 2009-07-16 20:47:01 +0000 | [diff] [blame] | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 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> |
| 25 | #include <sys/mman.h> |
| 26 | |
| 27 | #include "qemu.h" |
| 28 | #include "qemu-common.h" |
blueswir1 | 6c173b3 | 2008-11-29 14:05:16 +0000 | [diff] [blame] | 29 | #include "bsd-mman.h" |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 30 | |
| 31 | //#define DEBUG_MMAP |
| 32 | |
Juan Quintela | 2f7bb87 | 2009-07-27 16:13:24 +0200 | [diff] [blame] | 33 | #if defined(CONFIG_USE_NPTL) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 34 | pthread_mutex_t mmap_mutex; |
| 35 | static int __thread mmap_lock_count; |
| 36 | |
| 37 | void mmap_lock(void) |
| 38 | { |
| 39 | if (mmap_lock_count++ == 0) { |
| 40 | pthread_mutex_lock(&mmap_mutex); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | void mmap_unlock(void) |
| 45 | { |
| 46 | if (--mmap_lock_count == 0) { |
| 47 | pthread_mutex_unlock(&mmap_mutex); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | /* Grab lock to make sure things are in a consistent state after fork(). */ |
| 52 | void mmap_fork_start(void) |
| 53 | { |
| 54 | if (mmap_lock_count) |
| 55 | abort(); |
| 56 | pthread_mutex_lock(&mmap_mutex); |
| 57 | } |
| 58 | |
| 59 | void mmap_fork_end(int child) |
| 60 | { |
| 61 | if (child) |
| 62 | pthread_mutex_init(&mmap_mutex, NULL); |
| 63 | else |
| 64 | pthread_mutex_unlock(&mmap_mutex); |
| 65 | } |
| 66 | #else |
| 67 | /* We aren't threadsafe to start with, so no need to worry about locking. */ |
| 68 | void mmap_lock(void) |
| 69 | { |
| 70 | } |
| 71 | |
| 72 | void mmap_unlock(void) |
| 73 | { |
| 74 | } |
| 75 | #endif |
| 76 | |
| 77 | void *qemu_vmalloc(size_t size) |
| 78 | { |
| 79 | void *p; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 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_ANON, -1, 0); |
| 84 | |
Juergen Lock | b035ffd | 2010-03-25 22:11:17 +0100 | [diff] [blame] | 85 | if (h2g_valid(p)) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 86 | /* Allocated region overlaps guest address space. |
| 87 | This may recurse. */ |
Juergen Lock | b035ffd | 2010-03-25 22:11:17 +0100 | [diff] [blame] | 88 | abi_ulong addr = h2g(p); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 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 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 97 | void *g_malloc(size_t size) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 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. */ |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 107 | void * g_malloc0(size_t size) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 108 | { |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 109 | return g_malloc(size); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 110 | } |
| 111 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 112 | void g_free(void *ptr) |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 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 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 122 | void *g_realloc(void *ptr, size_t size) |
blueswir1 | 004c9ef | 2009-01-24 20:19:18 +0000 | [diff] [blame] | 123 | { |
| 124 | size_t old_size, copy; |
| 125 | void *new_ptr; |
| 126 | |
malc | baa8c60 | 2009-01-28 17:16:56 +0000 | [diff] [blame] | 127 | if (!ptr) |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 128 | return g_malloc(size); |
blueswir1 | 004c9ef | 2009-01-24 20:19:18 +0000 | [diff] [blame] | 129 | old_size = *(size_t *)((char *)ptr - 16); |
| 130 | copy = old_size < size ? old_size : size; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 131 | new_ptr = g_malloc(size); |
blueswir1 | 004c9ef | 2009-01-24 20:19:18 +0000 | [diff] [blame] | 132 | memcpy(new_ptr, ptr, copy); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 133 | g_free(ptr); |
blueswir1 | 004c9ef | 2009-01-24 20:19:18 +0000 | [diff] [blame] | 134 | return new_ptr; |
| 135 | } |
| 136 | |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 137 | /* NOTE: all the constants are the HOST ones, but addresses are target. */ |
| 138 | int target_mprotect(abi_ulong start, abi_ulong len, int prot) |
| 139 | { |
| 140 | abi_ulong end, host_start, host_end, addr; |
| 141 | int prot1, ret; |
| 142 | |
| 143 | #ifdef DEBUG_MMAP |
| 144 | printf("mprotect: start=0x" TARGET_FMT_lx |
| 145 | " len=0x" TARGET_FMT_lx " prot=%c%c%c\n", start, len, |
| 146 | prot & PROT_READ ? 'r' : '-', |
| 147 | prot & PROT_WRITE ? 'w' : '-', |
| 148 | prot & PROT_EXEC ? 'x' : '-'); |
| 149 | #endif |
| 150 | |
| 151 | if ((start & ~TARGET_PAGE_MASK) != 0) |
| 152 | return -EINVAL; |
| 153 | len = TARGET_PAGE_ALIGN(len); |
| 154 | end = start + len; |
| 155 | if (end < start) |
| 156 | return -EINVAL; |
| 157 | prot &= PROT_READ | PROT_WRITE | PROT_EXEC; |
| 158 | if (len == 0) |
| 159 | return 0; |
| 160 | |
| 161 | mmap_lock(); |
| 162 | host_start = start & qemu_host_page_mask; |
| 163 | host_end = HOST_PAGE_ALIGN(end); |
| 164 | if (start > host_start) { |
| 165 | /* handle host page containing start */ |
| 166 | prot1 = prot; |
| 167 | for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) { |
| 168 | prot1 |= page_get_flags(addr); |
| 169 | } |
| 170 | if (host_end == host_start + qemu_host_page_size) { |
| 171 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { |
| 172 | prot1 |= page_get_flags(addr); |
| 173 | } |
| 174 | end = host_end; |
| 175 | } |
| 176 | ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS); |
| 177 | if (ret != 0) |
| 178 | goto error; |
| 179 | host_start += qemu_host_page_size; |
| 180 | } |
| 181 | if (end < host_end) { |
| 182 | prot1 = prot; |
| 183 | for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) { |
| 184 | prot1 |= page_get_flags(addr); |
| 185 | } |
| 186 | ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size, |
| 187 | prot1 & PAGE_BITS); |
| 188 | if (ret != 0) |
| 189 | goto error; |
| 190 | host_end -= qemu_host_page_size; |
| 191 | } |
| 192 | |
| 193 | /* handle the pages in the middle */ |
| 194 | if (host_start < host_end) { |
| 195 | ret = mprotect(g2h(host_start), host_end - host_start, prot); |
| 196 | if (ret != 0) |
| 197 | goto error; |
| 198 | } |
| 199 | page_set_flags(start, start + len, prot | PAGE_VALID); |
| 200 | mmap_unlock(); |
| 201 | return 0; |
| 202 | error: |
| 203 | mmap_unlock(); |
| 204 | return ret; |
| 205 | } |
| 206 | |
| 207 | /* map an incomplete host page */ |
| 208 | static int mmap_frag(abi_ulong real_start, |
| 209 | abi_ulong start, abi_ulong end, |
| 210 | int prot, int flags, int fd, abi_ulong offset) |
| 211 | { |
| 212 | abi_ulong real_end, addr; |
| 213 | void *host_start; |
| 214 | int prot1, prot_new; |
| 215 | |
| 216 | real_end = real_start + qemu_host_page_size; |
| 217 | host_start = g2h(real_start); |
| 218 | |
| 219 | /* get the protection of the target pages outside the mapping */ |
| 220 | prot1 = 0; |
| 221 | for(addr = real_start; addr < real_end; addr++) { |
| 222 | if (addr < start || addr >= end) |
| 223 | prot1 |= page_get_flags(addr); |
| 224 | } |
| 225 | |
| 226 | if (prot1 == 0) { |
| 227 | /* no page was there, so we allocate one */ |
| 228 | void *p = mmap(host_start, qemu_host_page_size, prot, |
| 229 | flags | MAP_ANON, -1, 0); |
| 230 | if (p == MAP_FAILED) |
| 231 | return -1; |
| 232 | prot1 = prot; |
| 233 | } |
| 234 | prot1 &= PAGE_BITS; |
| 235 | |
| 236 | prot_new = prot | prot1; |
| 237 | if (!(flags & MAP_ANON)) { |
| 238 | /* msync() won't work here, so we return an error if write is |
| 239 | possible while it is a shared mapping */ |
blueswir1 | 6c173b3 | 2008-11-29 14:05:16 +0000 | [diff] [blame] | 240 | if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED && |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 241 | (prot & PROT_WRITE)) |
Blue Swirl | 059bca4 | 2010-01-31 13:41:07 +0000 | [diff] [blame] | 242 | return -1; |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 243 | |
| 244 | /* adjust protection to be able to read */ |
| 245 | if (!(prot1 & PROT_WRITE)) |
| 246 | mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE); |
| 247 | |
| 248 | /* read the corresponding file data */ |
| 249 | pread(fd, g2h(start), end - start, offset); |
| 250 | |
| 251 | /* put final protection */ |
| 252 | if (prot_new != (prot1 | PROT_WRITE)) |
| 253 | mprotect(host_start, qemu_host_page_size, prot_new); |
| 254 | } else { |
| 255 | /* just update the protection */ |
| 256 | if (prot_new != prot1) { |
| 257 | mprotect(host_start, qemu_host_page_size, prot_new); |
| 258 | } |
| 259 | } |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | #if defined(__CYGWIN__) |
| 264 | /* Cygwin doesn't have a whole lot of address space. */ |
| 265 | static abi_ulong mmap_next_start = 0x18000000; |
| 266 | #else |
| 267 | static abi_ulong mmap_next_start = 0x40000000; |
| 268 | #endif |
| 269 | |
| 270 | unsigned long last_brk; |
| 271 | |
| 272 | /* find a free memory area of size 'size'. The search starts at |
| 273 | 'start'. If 'start' == 0, then a default start address is used. |
| 274 | Return -1 if error. |
| 275 | */ |
| 276 | /* page_init() marks pages used by the host as reserved to be sure not |
| 277 | to use them. */ |
| 278 | static abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size) |
| 279 | { |
| 280 | abi_ulong addr, addr1, addr_start; |
| 281 | int prot; |
| 282 | unsigned long new_brk; |
| 283 | |
| 284 | new_brk = (unsigned long)sbrk(0); |
| 285 | if (last_brk && last_brk < new_brk && last_brk == (target_ulong)last_brk) { |
| 286 | /* This is a hack to catch the host allocating memory with brk(). |
| 287 | If it uses mmap then we loose. |
| 288 | FIXME: We really want to avoid the host allocating memory in |
| 289 | the first place, and maybe leave some slack to avoid switching |
| 290 | to mmap. */ |
| 291 | page_set_flags(last_brk & TARGET_PAGE_MASK, |
| 292 | TARGET_PAGE_ALIGN(new_brk), |
| 293 | PAGE_RESERVED); |
| 294 | } |
| 295 | last_brk = new_brk; |
| 296 | |
| 297 | size = HOST_PAGE_ALIGN(size); |
| 298 | start = start & qemu_host_page_mask; |
| 299 | addr = start; |
| 300 | if (addr == 0) |
| 301 | addr = mmap_next_start; |
| 302 | addr_start = addr; |
| 303 | for(;;) { |
| 304 | prot = 0; |
| 305 | for(addr1 = addr; addr1 < (addr + size); addr1 += TARGET_PAGE_SIZE) { |
| 306 | prot |= page_get_flags(addr1); |
| 307 | } |
| 308 | if (prot == 0) |
| 309 | break; |
| 310 | addr += qemu_host_page_size; |
| 311 | /* we found nothing */ |
| 312 | if (addr == addr_start) |
| 313 | return (abi_ulong)-1; |
| 314 | } |
| 315 | if (start == 0) |
| 316 | mmap_next_start = addr + size; |
| 317 | return addr; |
| 318 | } |
| 319 | |
| 320 | /* NOTE: all the constants are the HOST ones */ |
| 321 | abi_long target_mmap(abi_ulong start, abi_ulong len, int prot, |
| 322 | int flags, int fd, abi_ulong offset) |
| 323 | { |
| 324 | abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len; |
| 325 | unsigned long host_start; |
| 326 | |
| 327 | mmap_lock(); |
| 328 | #ifdef DEBUG_MMAP |
| 329 | { |
| 330 | printf("mmap: start=0x" TARGET_FMT_lx |
| 331 | " len=0x" TARGET_FMT_lx " prot=%c%c%c flags=", |
| 332 | start, len, |
| 333 | prot & PROT_READ ? 'r' : '-', |
| 334 | prot & PROT_WRITE ? 'w' : '-', |
| 335 | prot & PROT_EXEC ? 'x' : '-'); |
| 336 | if (flags & MAP_FIXED) |
| 337 | printf("MAP_FIXED "); |
| 338 | if (flags & MAP_ANON) |
| 339 | printf("MAP_ANON "); |
blueswir1 | 6c173b3 | 2008-11-29 14:05:16 +0000 | [diff] [blame] | 340 | switch(flags & TARGET_BSD_MAP_FLAGMASK) { |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 341 | case MAP_PRIVATE: |
| 342 | printf("MAP_PRIVATE "); |
| 343 | break; |
| 344 | case MAP_SHARED: |
| 345 | printf("MAP_SHARED "); |
| 346 | break; |
| 347 | default: |
blueswir1 | 6c173b3 | 2008-11-29 14:05:16 +0000 | [diff] [blame] | 348 | printf("[MAP_FLAGMASK=0x%x] ", flags & TARGET_BSD_MAP_FLAGMASK); |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 349 | break; |
| 350 | } |
| 351 | printf("fd=%d offset=" TARGET_FMT_lx "\n", fd, offset); |
| 352 | } |
| 353 | #endif |
| 354 | |
| 355 | if (offset & ~TARGET_PAGE_MASK) { |
| 356 | errno = EINVAL; |
| 357 | goto fail; |
| 358 | } |
| 359 | |
| 360 | len = TARGET_PAGE_ALIGN(len); |
| 361 | if (len == 0) |
| 362 | goto the_end; |
| 363 | real_start = start & qemu_host_page_mask; |
| 364 | |
| 365 | if (!(flags & MAP_FIXED)) { |
| 366 | abi_ulong mmap_start; |
| 367 | void *p; |
| 368 | host_offset = offset & qemu_host_page_mask; |
| 369 | host_len = len + offset - host_offset; |
| 370 | host_len = HOST_PAGE_ALIGN(host_len); |
| 371 | mmap_start = mmap_find_vma(real_start, host_len); |
| 372 | if (mmap_start == (abi_ulong)-1) { |
| 373 | errno = ENOMEM; |
| 374 | goto fail; |
| 375 | } |
| 376 | /* Note: we prefer to control the mapping address. It is |
| 377 | especially important if qemu_host_page_size > |
| 378 | qemu_real_host_page_size */ |
| 379 | p = mmap(g2h(mmap_start), |
| 380 | host_len, prot, flags | MAP_FIXED, fd, host_offset); |
| 381 | if (p == MAP_FAILED) |
| 382 | goto fail; |
| 383 | /* update start so that it points to the file position at 'offset' */ |
| 384 | host_start = (unsigned long)p; |
| 385 | if (!(flags & MAP_ANON)) |
| 386 | host_start += offset - host_offset; |
| 387 | start = h2g(host_start); |
| 388 | } else { |
| 389 | int flg; |
| 390 | target_ulong addr; |
| 391 | |
| 392 | if (start & ~TARGET_PAGE_MASK) { |
| 393 | errno = EINVAL; |
| 394 | goto fail; |
| 395 | } |
| 396 | end = start + len; |
| 397 | real_end = HOST_PAGE_ALIGN(end); |
| 398 | |
| 399 | for(addr = real_start; addr < real_end; addr += TARGET_PAGE_SIZE) { |
| 400 | flg = page_get_flags(addr); |
| 401 | if (flg & PAGE_RESERVED) { |
| 402 | errno = ENXIO; |
| 403 | goto fail; |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | /* worst case: we cannot map the file because the offset is not |
| 408 | aligned, so we read it */ |
| 409 | if (!(flags & MAP_ANON) && |
| 410 | (offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) { |
| 411 | /* msync() won't work here, so we return an error if write is |
| 412 | possible while it is a shared mapping */ |
blueswir1 | 6c173b3 | 2008-11-29 14:05:16 +0000 | [diff] [blame] | 413 | if ((flags & TARGET_BSD_MAP_FLAGMASK) == MAP_SHARED && |
blueswir1 | 8477850 | 2008-10-26 20:33:16 +0000 | [diff] [blame] | 414 | (prot & PROT_WRITE)) { |
| 415 | errno = EINVAL; |
| 416 | goto fail; |
| 417 | } |
| 418 | retaddr = target_mmap(start, len, prot | PROT_WRITE, |
| 419 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, |
| 420 | -1, 0); |
| 421 | if (retaddr == -1) |
| 422 | goto fail; |
| 423 | pread(fd, g2h(start), len, offset); |
| 424 | if (!(prot & PROT_WRITE)) { |
| 425 | ret = target_mprotect(start, len, prot); |
| 426 | if (ret != 0) { |
| 427 | start = ret; |
| 428 | goto the_end; |
| 429 | } |
| 430 | } |
| 431 | goto the_end; |
| 432 | } |
| 433 | |
| 434 | /* handle the start of the mapping */ |
| 435 | if (start > real_start) { |
| 436 | if (real_end == real_start + qemu_host_page_size) { |
| 437 | /* one single host page */ |
| 438 | ret = mmap_frag(real_start, start, end, |
| 439 | prot, flags, fd, offset); |
| 440 | if (ret == -1) |
| 441 | goto fail; |
| 442 | goto the_end1; |
| 443 | } |
| 444 | ret = mmap_frag(real_start, start, real_start + qemu_host_page_size, |
| 445 | prot, flags, fd, offset); |
| 446 | if (ret == -1) |
| 447 | goto fail; |
| 448 | real_start += qemu_host_page_size; |
| 449 | } |
| 450 | /* handle the end of the mapping */ |
| 451 | if (end < real_end) { |
| 452 | ret = mmap_frag(real_end - qemu_host_page_size, |
| 453 | real_end - qemu_host_page_size, real_end, |
| 454 | prot, flags, fd, |
| 455 | offset + real_end - qemu_host_page_size - start); |
| 456 | if (ret == -1) |
| 457 | goto fail; |
| 458 | real_end -= qemu_host_page_size; |
| 459 | } |
| 460 | |
| 461 | /* map the middle (easier) */ |
| 462 | if (real_start < real_end) { |
| 463 | void *p; |
| 464 | unsigned long offset1; |
| 465 | if (flags & MAP_ANON) |
| 466 | offset1 = 0; |
| 467 | else |
| 468 | offset1 = offset + real_start - start; |
| 469 | p = mmap(g2h(real_start), real_end - real_start, |
| 470 | prot, flags, fd, offset1); |
| 471 | if (p == MAP_FAILED) |
| 472 | goto fail; |
| 473 | } |
| 474 | } |
| 475 | the_end1: |
| 476 | page_set_flags(start, start + len, prot | PAGE_VALID); |
| 477 | the_end: |
| 478 | #ifdef DEBUG_MMAP |
| 479 | printf("ret=0x" TARGET_FMT_lx "\n", start); |
| 480 | page_dump(stdout); |
| 481 | printf("\n"); |
| 482 | #endif |
| 483 | mmap_unlock(); |
| 484 | return start; |
| 485 | fail: |
| 486 | mmap_unlock(); |
| 487 | return -1; |
| 488 | } |
| 489 | |
| 490 | int target_munmap(abi_ulong start, abi_ulong len) |
| 491 | { |
| 492 | abi_ulong end, real_start, real_end, addr; |
| 493 | int prot, ret; |
| 494 | |
| 495 | #ifdef DEBUG_MMAP |
| 496 | printf("munmap: start=0x%lx len=0x%lx\n", start, len); |
| 497 | #endif |
| 498 | if (start & ~TARGET_PAGE_MASK) |
| 499 | return -EINVAL; |
| 500 | len = TARGET_PAGE_ALIGN(len); |
| 501 | if (len == 0) |
| 502 | return -EINVAL; |
| 503 | mmap_lock(); |
| 504 | end = start + len; |
| 505 | real_start = start & qemu_host_page_mask; |
| 506 | real_end = HOST_PAGE_ALIGN(end); |
| 507 | |
| 508 | if (start > real_start) { |
| 509 | /* handle host page containing start */ |
| 510 | prot = 0; |
| 511 | for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) { |
| 512 | prot |= page_get_flags(addr); |
| 513 | } |
| 514 | if (real_end == real_start + qemu_host_page_size) { |
| 515 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { |
| 516 | prot |= page_get_flags(addr); |
| 517 | } |
| 518 | end = real_end; |
| 519 | } |
| 520 | if (prot != 0) |
| 521 | real_start += qemu_host_page_size; |
| 522 | } |
| 523 | if (end < real_end) { |
| 524 | prot = 0; |
| 525 | for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) { |
| 526 | prot |= page_get_flags(addr); |
| 527 | } |
| 528 | if (prot != 0) |
| 529 | real_end -= qemu_host_page_size; |
| 530 | } |
| 531 | |
| 532 | ret = 0; |
| 533 | /* unmap what we can */ |
| 534 | if (real_start < real_end) { |
| 535 | ret = munmap(g2h(real_start), real_end - real_start); |
| 536 | } |
| 537 | |
| 538 | if (ret == 0) |
| 539 | page_set_flags(start, start + len, 0); |
| 540 | mmap_unlock(); |
| 541 | return ret; |
| 542 | } |
| 543 | |
| 544 | int target_msync(abi_ulong start, abi_ulong len, int flags) |
| 545 | { |
| 546 | abi_ulong end; |
| 547 | |
| 548 | if (start & ~TARGET_PAGE_MASK) |
| 549 | return -EINVAL; |
| 550 | len = TARGET_PAGE_ALIGN(len); |
| 551 | end = start + len; |
| 552 | if (end < start) |
| 553 | return -EINVAL; |
| 554 | if (end == start) |
| 555 | return 0; |
| 556 | |
| 557 | start &= qemu_host_page_mask; |
| 558 | return msync(g2h(start), end - start, flags); |
| 559 | } |