1 /* 2 * BSD syscalls 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright (c) 2013-2014 Stacey D. Son 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 #include "qemu/osdep.h" 21 #include "qemu/cutils.h" 22 #include "qemu/path.h" 23 #include <sys/syscall.h> 24 #include <sys/cdefs.h> 25 #include <sys/param.h> 26 #include <sys/mount.h> 27 #include <sys/sysctl.h> 28 #include <utime.h> 29 30 #include "include/gdbstub/syscalls.h" 31 32 #include "qemu.h" 33 #include "signal-common.h" 34 #include "user/syscall-trace.h" 35 36 #include "bsd-file.h" 37 #include "bsd-proc.h" 38 39 /* *BSD dependent syscall shims */ 40 #include "os-stat.h" 41 42 /* I/O */ 43 safe_syscall3(int, open, const char *, path, int, flags, mode_t, mode); 44 safe_syscall4(int, openat, int, fd, const char *, path, int, flags, mode_t, 45 mode); 46 47 safe_syscall3(ssize_t, read, int, fd, void *, buf, size_t, nbytes); 48 safe_syscall4(ssize_t, pread, int, fd, void *, buf, size_t, nbytes, off_t, 49 offset); 50 safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt); 51 safe_syscall4(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt, 52 off_t, offset); 53 54 safe_syscall3(ssize_t, write, int, fd, void *, buf, size_t, nbytes); 55 safe_syscall4(ssize_t, pwrite, int, fd, void *, buf, size_t, nbytes, off_t, 56 offset); 57 safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt); 58 safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt, 59 off_t, offset); 60 61 void target_set_brk(abi_ulong new_brk) 62 { 63 } 64 65 /* 66 * errno conversion. 67 */ 68 abi_long get_errno(abi_long ret) 69 { 70 if (ret == -1) { 71 return -host_to_target_errno(errno); 72 } else { 73 return ret; 74 } 75 } 76 77 int host_to_target_errno(int err) 78 { 79 /* 80 * All the BSDs have the property that the error numbers are uniform across 81 * all architectures for a given BSD, though they may vary between different 82 * BSDs. 83 */ 84 return err; 85 } 86 87 bool is_error(abi_long ret) 88 { 89 return (abi_ulong)ret >= (abi_ulong)(-4096); 90 } 91 92 /* 93 * Unlocks a iovec. Unlike unlock_iovec, it assumes the tvec array itself is 94 * already locked from target_addr. It will be unlocked as well as all the iovec 95 * elements. 96 */ 97 static void helper_unlock_iovec(struct target_iovec *target_vec, 98 abi_ulong target_addr, struct iovec *vec, 99 int count, int copy) 100 { 101 for (int i = 0; i < count; i++) { 102 abi_ulong base = tswapal(target_vec[i].iov_base); 103 104 if (vec[i].iov_base) { 105 unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0); 106 } 107 } 108 unlock_user(target_vec, target_addr, 0); 109 } 110 111 struct iovec *lock_iovec(int type, abi_ulong target_addr, 112 int count, int copy) 113 { 114 struct target_iovec *target_vec; 115 struct iovec *vec; 116 abi_ulong total_len, max_len; 117 int i; 118 int err = 0; 119 120 if (count == 0) { 121 errno = 0; 122 return NULL; 123 } 124 if (count < 0 || count > IOV_MAX) { 125 errno = EINVAL; 126 return NULL; 127 } 128 129 vec = g_try_new0(struct iovec, count); 130 if (vec == NULL) { 131 errno = ENOMEM; 132 return NULL; 133 } 134 135 target_vec = lock_user(VERIFY_READ, target_addr, 136 count * sizeof(struct target_iovec), 1); 137 if (target_vec == NULL) { 138 err = EFAULT; 139 goto fail2; 140 } 141 142 max_len = 0x7fffffff & MIN(TARGET_PAGE_MASK, PAGE_MASK); 143 total_len = 0; 144 145 for (i = 0; i < count; i++) { 146 abi_ulong base = tswapal(target_vec[i].iov_base); 147 abi_long len = tswapal(target_vec[i].iov_len); 148 149 if (len < 0) { 150 err = EINVAL; 151 goto fail; 152 } else if (len == 0) { 153 /* Zero length pointer is ignored. */ 154 vec[i].iov_base = 0; 155 } else { 156 vec[i].iov_base = lock_user(type, base, len, copy); 157 /* 158 * If the first buffer pointer is bad, this is a fault. But 159 * subsequent bad buffers will result in a partial write; this is 160 * realized by filling the vector with null pointers and zero 161 * lengths. 162 */ 163 if (!vec[i].iov_base) { 164 if (i == 0) { 165 err = EFAULT; 166 goto fail; 167 } else { 168 /* 169 * Fail all the subsequent addresses, they are already 170 * zero'd. 171 */ 172 goto out; 173 } 174 } 175 if (len > max_len - total_len) { 176 len = max_len - total_len; 177 } 178 } 179 vec[i].iov_len = len; 180 total_len += len; 181 } 182 out: 183 unlock_user(target_vec, target_addr, 0); 184 return vec; 185 186 fail: 187 helper_unlock_iovec(target_vec, target_addr, vec, i, copy); 188 fail2: 189 g_free(vec); 190 errno = err; 191 return NULL; 192 } 193 194 void unlock_iovec(struct iovec *vec, abi_ulong target_addr, 195 int count, int copy) 196 { 197 struct target_iovec *target_vec; 198 199 target_vec = lock_user(VERIFY_READ, target_addr, 200 count * sizeof(struct target_iovec), 1); 201 if (target_vec) { 202 helper_unlock_iovec(target_vec, target_addr, vec, count, copy); 203 } 204 205 g_free(vec); 206 } 207 208 /* 209 * All errnos that freebsd_syscall() returns must be -TARGET_<errcode>. 210 */ 211 static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1, 212 abi_long arg2, abi_long arg3, abi_long arg4, 213 abi_long arg5, abi_long arg6, abi_long arg7, 214 abi_long arg8) 215 { 216 abi_long ret; 217 218 switch (num) { 219 /* 220 * process system calls 221 */ 222 case TARGET_FREEBSD_NR_exit: /* exit(2) */ 223 ret = do_bsd_exit(cpu_env, arg1); 224 break; 225 226 /* 227 * File system calls. 228 */ 229 case TARGET_FREEBSD_NR_read: /* read(2) */ 230 ret = do_bsd_read(arg1, arg2, arg3); 231 break; 232 233 case TARGET_FREEBSD_NR_pread: /* pread(2) */ 234 ret = do_bsd_pread(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 235 break; 236 237 case TARGET_FREEBSD_NR_readv: /* readv(2) */ 238 ret = do_bsd_readv(arg1, arg2, arg3); 239 break; 240 241 case TARGET_FREEBSD_NR_preadv: /* preadv(2) */ 242 ret = do_bsd_preadv(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 243 break; 244 245 case TARGET_FREEBSD_NR_write: /* write(2) */ 246 ret = do_bsd_write(arg1, arg2, arg3); 247 break; 248 249 case TARGET_FREEBSD_NR_pwrite: /* pwrite(2) */ 250 ret = do_bsd_pwrite(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 251 break; 252 253 case TARGET_FREEBSD_NR_writev: /* writev(2) */ 254 ret = do_bsd_writev(arg1, arg2, arg3); 255 break; 256 257 case TARGET_FREEBSD_NR_pwritev: /* pwritev(2) */ 258 ret = do_bsd_pwritev(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 259 break; 260 261 case TARGET_FREEBSD_NR_open: /* open(2) */ 262 ret = do_bsd_open(arg1, arg2, arg3); 263 break; 264 265 case TARGET_FREEBSD_NR_openat: /* openat(2) */ 266 ret = do_bsd_openat(arg1, arg2, arg3, arg4); 267 break; 268 269 case TARGET_FREEBSD_NR_close: /* close(2) */ 270 ret = do_bsd_close(arg1); 271 break; 272 273 case TARGET_FREEBSD_NR_fdatasync: /* fdatasync(2) */ 274 ret = do_bsd_fdatasync(arg1); 275 break; 276 277 case TARGET_FREEBSD_NR_fsync: /* fsync(2) */ 278 ret = do_bsd_fsync(arg1); 279 break; 280 281 case TARGET_FREEBSD_NR_freebsd12_closefrom: /* closefrom(2) */ 282 ret = do_bsd_closefrom(arg1); 283 break; 284 285 case TARGET_FREEBSD_NR_revoke: /* revoke(2) */ 286 ret = do_bsd_revoke(arg1); 287 break; 288 289 case TARGET_FREEBSD_NR_access: /* access(2) */ 290 ret = do_bsd_access(arg1, arg2); 291 break; 292 293 case TARGET_FREEBSD_NR_eaccess: /* eaccess(2) */ 294 ret = do_bsd_eaccess(arg1, arg2); 295 break; 296 297 case TARGET_FREEBSD_NR_faccessat: /* faccessat(2) */ 298 ret = do_bsd_faccessat(arg1, arg2, arg3, arg4); 299 break; 300 301 case TARGET_FREEBSD_NR_chdir: /* chdir(2) */ 302 ret = do_bsd_chdir(arg1); 303 break; 304 305 case TARGET_FREEBSD_NR_fchdir: /* fchdir(2) */ 306 ret = do_bsd_fchdir(arg1); 307 break; 308 309 case TARGET_FREEBSD_NR_rename: /* rename(2) */ 310 ret = do_bsd_rename(arg1, arg2); 311 break; 312 313 case TARGET_FREEBSD_NR_renameat: /* renameat(2) */ 314 ret = do_bsd_renameat(arg1, arg2, arg3, arg4); 315 break; 316 317 case TARGET_FREEBSD_NR_link: /* link(2) */ 318 ret = do_bsd_link(arg1, arg2); 319 break; 320 321 case TARGET_FREEBSD_NR_linkat: /* linkat(2) */ 322 ret = do_bsd_linkat(arg1, arg2, arg3, arg4, arg5); 323 break; 324 325 case TARGET_FREEBSD_NR_unlink: /* unlink(2) */ 326 ret = do_bsd_unlink(arg1); 327 break; 328 329 case TARGET_FREEBSD_NR_unlinkat: /* unlinkat(2) */ 330 ret = do_bsd_unlinkat(arg1, arg2, arg3); 331 break; 332 333 case TARGET_FREEBSD_NR_mkdir: /* mkdir(2) */ 334 ret = do_bsd_mkdir(arg1, arg2); 335 break; 336 337 case TARGET_FREEBSD_NR_mkdirat: /* mkdirat(2) */ 338 ret = do_bsd_mkdirat(arg1, arg2, arg3); 339 break; 340 341 case TARGET_FREEBSD_NR_rmdir: /* rmdir(2) (XXX no rmdirat()?) */ 342 ret = do_bsd_rmdir(arg1); 343 break; 344 345 case TARGET_FREEBSD_NR___getcwd: /* undocumented __getcwd() */ 346 ret = do_bsd___getcwd(arg1, arg2); 347 break; 348 349 case TARGET_FREEBSD_NR_dup: /* dup(2) */ 350 ret = do_bsd_dup(arg1); 351 break; 352 353 case TARGET_FREEBSD_NR_dup2: /* dup2(2) */ 354 ret = do_bsd_dup2(arg1, arg2); 355 break; 356 357 case TARGET_FREEBSD_NR_truncate: /* truncate(2) */ 358 ret = do_bsd_truncate(cpu_env, arg1, arg2, arg3, arg4); 359 break; 360 361 case TARGET_FREEBSD_NR_ftruncate: /* ftruncate(2) */ 362 ret = do_bsd_ftruncate(cpu_env, arg1, arg2, arg3, arg4); 363 break; 364 365 case TARGET_FREEBSD_NR_acct: /* acct(2) */ 366 ret = do_bsd_acct(arg1); 367 break; 368 369 case TARGET_FREEBSD_NR_sync: /* sync(2) */ 370 ret = do_bsd_sync(); 371 break; 372 373 case TARGET_FREEBSD_NR_mount: /* mount(2) */ 374 ret = do_bsd_mount(arg1, arg2, arg3, arg4); 375 break; 376 377 case TARGET_FREEBSD_NR_unmount: /* unmount(2) */ 378 ret = do_bsd_unmount(arg1, arg2); 379 break; 380 381 case TARGET_FREEBSD_NR_nmount: /* nmount(2) */ 382 ret = do_bsd_nmount(arg1, arg2, arg3); 383 break; 384 385 case TARGET_FREEBSD_NR_symlink: /* symlink(2) */ 386 ret = do_bsd_symlink(arg1, arg2); 387 break; 388 389 case TARGET_FREEBSD_NR_symlinkat: /* symlinkat(2) */ 390 ret = do_bsd_symlinkat(arg1, arg2, arg3); 391 break; 392 393 case TARGET_FREEBSD_NR_readlink: /* readlink(2) */ 394 ret = do_bsd_readlink(cpu_env, arg1, arg2, arg3); 395 break; 396 397 case TARGET_FREEBSD_NR_readlinkat: /* readlinkat(2) */ 398 ret = do_bsd_readlinkat(arg1, arg2, arg3, arg4); 399 break; 400 401 case TARGET_FREEBSD_NR_chmod: /* chmod(2) */ 402 ret = do_bsd_chmod(arg1, arg2); 403 break; 404 405 case TARGET_FREEBSD_NR_fchmod: /* fchmod(2) */ 406 ret = do_bsd_fchmod(arg1, arg2); 407 break; 408 409 case TARGET_FREEBSD_NR_lchmod: /* lchmod(2) */ 410 ret = do_bsd_lchmod(arg1, arg2); 411 break; 412 413 case TARGET_FREEBSD_NR_fchmodat: /* fchmodat(2) */ 414 ret = do_bsd_fchmodat(arg1, arg2, arg3, arg4); 415 break; 416 417 case TARGET_FREEBSD_NR_freebsd11_mknod: /* mknod(2) */ 418 ret = do_bsd_freebsd11_mknod(arg1, arg2, arg3); 419 break; 420 421 case TARGET_FREEBSD_NR_freebsd11_mknodat: /* mknodat(2) */ 422 ret = do_bsd_freebsd11_mknodat(arg1, arg2, arg3, arg4); 423 break; 424 425 case TARGET_FREEBSD_NR_mknodat: /* mknodat(2) */ 426 ret = do_bsd_mknodat(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 427 break; 428 429 case TARGET_FREEBSD_NR_chown: /* chown(2) */ 430 ret = do_bsd_chown(arg1, arg2, arg3); 431 break; 432 433 case TARGET_FREEBSD_NR_fchown: /* fchown(2) */ 434 ret = do_bsd_fchown(arg1, arg2, arg3); 435 break; 436 437 case TARGET_FREEBSD_NR_lchown: /* lchown(2) */ 438 ret = do_bsd_lchown(arg1, arg2, arg3); 439 break; 440 441 case TARGET_FREEBSD_NR_fchownat: /* fchownat(2) */ 442 ret = do_bsd_fchownat(arg1, arg2, arg3, arg4, arg5); 443 break; 444 445 case TARGET_FREEBSD_NR_chflags: /* chflags(2) */ 446 ret = do_bsd_chflags(arg1, arg2); 447 break; 448 449 case TARGET_FREEBSD_NR_lchflags: /* lchflags(2) */ 450 ret = do_bsd_lchflags(arg1, arg2); 451 break; 452 453 case TARGET_FREEBSD_NR_fchflags: /* fchflags(2) */ 454 ret = do_bsd_fchflags(arg1, arg2); 455 break; 456 457 case TARGET_FREEBSD_NR_chroot: /* chroot(2) */ 458 ret = do_bsd_chroot(arg1); 459 break; 460 461 case TARGET_FREEBSD_NR_flock: /* flock(2) */ 462 ret = do_bsd_flock(arg1, arg2); 463 break; 464 465 case TARGET_FREEBSD_NR_mkfifo: /* mkfifo(2) */ 466 ret = do_bsd_mkfifo(arg1, arg2); 467 break; 468 469 case TARGET_FREEBSD_NR_mkfifoat: /* mkfifoat(2) */ 470 ret = do_bsd_mkfifoat(arg1, arg2, arg3); 471 break; 472 473 case TARGET_FREEBSD_NR_pathconf: /* pathconf(2) */ 474 ret = do_bsd_pathconf(arg1, arg2); 475 break; 476 477 case TARGET_FREEBSD_NR_lpathconf: /* lpathconf(2) */ 478 ret = do_bsd_lpathconf(arg1, arg2); 479 break; 480 481 case TARGET_FREEBSD_NR_fpathconf: /* fpathconf(2) */ 482 ret = do_bsd_fpathconf(arg1, arg2); 483 break; 484 485 case TARGET_FREEBSD_NR_undelete: /* undelete(2) */ 486 ret = do_bsd_undelete(arg1); 487 break; 488 489 /* 490 * stat system calls 491 */ 492 case TARGET_FREEBSD_NR_freebsd11_stat: /* stat(2) */ 493 ret = do_freebsd11_stat(arg1, arg2); 494 break; 495 496 case TARGET_FREEBSD_NR_freebsd11_lstat: /* lstat(2) */ 497 ret = do_freebsd11_lstat(arg1, arg2); 498 break; 499 500 case TARGET_FREEBSD_NR_freebsd11_fstat: /* fstat(2) */ 501 ret = do_freebsd11_fstat(arg1, arg2); 502 break; 503 504 case TARGET_FREEBSD_NR_fstat: /* fstat(2) */ 505 ret = do_freebsd_fstat(arg1, arg2); 506 break; 507 508 case TARGET_FREEBSD_NR_freebsd11_fstatat: /* fstatat(2) */ 509 ret = do_freebsd11_fstatat(arg1, arg2, arg3, arg4); 510 break; 511 512 case TARGET_FREEBSD_NR_fstatat: /* fstatat(2) */ 513 ret = do_freebsd_fstatat(arg1, arg2, arg3, arg4); 514 break; 515 516 case TARGET_FREEBSD_NR_freebsd11_nstat: /* undocumented */ 517 ret = do_freebsd11_nstat(arg1, arg2); 518 break; 519 520 case TARGET_FREEBSD_NR_freebsd11_nfstat: /* undocumented */ 521 ret = do_freebsd11_nfstat(arg1, arg2); 522 break; 523 524 case TARGET_FREEBSD_NR_freebsd11_nlstat: /* undocumented */ 525 ret = do_freebsd11_nlstat(arg1, arg2); 526 break; 527 528 case TARGET_FREEBSD_NR_getfh: /* getfh(2) */ 529 ret = do_freebsd_getfh(arg1, arg2); 530 break; 531 532 case TARGET_FREEBSD_NR_lgetfh: /* lgetfh(2) */ 533 ret = do_freebsd_lgetfh(arg1, arg2); 534 break; 535 536 case TARGET_FREEBSD_NR_fhopen: /* fhopen(2) */ 537 ret = do_freebsd_fhopen(arg1, arg2); 538 break; 539 540 case TARGET_FREEBSD_NR_freebsd11_fhstat: /* fhstat(2) */ 541 ret = do_freebsd11_fhstat(arg1, arg2); 542 break; 543 544 case TARGET_FREEBSD_NR_fhstat: /* fhstat(2) */ 545 ret = do_freebsd_fhstat(arg1, arg2); 546 break; 547 548 case TARGET_FREEBSD_NR_freebsd11_fhstatfs: /* fhstatfs(2) */ 549 ret = do_freebsd11_fhstatfs(arg1, arg2); 550 break; 551 552 case TARGET_FREEBSD_NR_fhstatfs: /* fhstatfs(2) */ 553 ret = do_freebsd_fhstatfs(arg1, arg2); 554 break; 555 556 case TARGET_FREEBSD_NR_freebsd11_statfs: /* statfs(2) */ 557 ret = do_freebsd11_statfs(arg1, arg2); 558 break; 559 560 case TARGET_FREEBSD_NR_statfs: /* statfs(2) */ 561 ret = do_freebsd_statfs(arg1, arg2); 562 break; 563 564 case TARGET_FREEBSD_NR_freebsd11_fstatfs: /* fstatfs(2) */ 565 ret = do_freebsd11_fstatfs(arg1, arg2); 566 break; 567 568 case TARGET_FREEBSD_NR_fstatfs: /* fstatfs(2) */ 569 ret = do_freebsd_fstatfs(arg1, arg2); 570 break; 571 572 case TARGET_FREEBSD_NR_freebsd11_getfsstat: /* getfsstat(2) */ 573 ret = do_freebsd11_getfsstat(arg1, arg2, arg3); 574 break; 575 576 case TARGET_FREEBSD_NR_getfsstat: /* getfsstat(2) */ 577 ret = do_freebsd_getfsstat(arg1, arg2, arg3); 578 break; 579 580 case TARGET_FREEBSD_NR_freebsd11_getdents: /* getdents(2) */ 581 ret = do_freebsd11_getdents(arg1, arg2, arg3); 582 break; 583 584 case TARGET_FREEBSD_NR_getdirentries: /* getdirentries(2) */ 585 ret = do_freebsd_getdirentries(arg1, arg2, arg3, arg4); 586 break; 587 588 case TARGET_FREEBSD_NR_freebsd11_getdirentries: /* getdirentries(2) */ 589 ret = do_freebsd11_getdirentries(arg1, arg2, arg3, arg4); 590 break; 591 case TARGET_FREEBSD_NR_fcntl: /* fcntl(2) */ 592 ret = do_freebsd_fcntl(arg1, arg2, arg3); 593 break; 594 595 596 /* 597 * sys{ctl, arch, call} 598 */ 599 case TARGET_FREEBSD_NR___sysctl: /* sysctl(3) */ 600 ret = do_freebsd_sysctl(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 601 break; 602 603 case TARGET_FREEBSD_NR___sysctlbyname: /* sysctlbyname(2) */ 604 ret = do_freebsd_sysctlbyname(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 605 break; 606 607 case TARGET_FREEBSD_NR_sysarch: /* sysarch(2) */ 608 ret = do_freebsd_sysarch(cpu_env, arg1, arg2); 609 break; 610 611 default: 612 qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); 613 ret = -TARGET_ENOSYS; 614 break; 615 } 616 617 return ret; 618 } 619 620 /* 621 * do_freebsd_syscall() should always have a single exit point at the end so 622 * that actions, such as logging of syscall results, can be performed. This 623 * as a wrapper around freebsd_syscall() so that actually happens. Since 624 * that is a singleton, modern compilers will inline it anyway... 625 */ 626 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1, 627 abi_long arg2, abi_long arg3, abi_long arg4, 628 abi_long arg5, abi_long arg6, abi_long arg7, 629 abi_long arg8) 630 { 631 abi_long ret; 632 633 if (do_strace) { 634 print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6); 635 } 636 637 ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6, 638 arg7, arg8); 639 if (do_strace) { 640 print_freebsd_syscall_ret(num, ret); 641 } 642 643 return ret; 644 } 645 646 void syscall_init(void) 647 { 648 } 649