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); 243 244 case TARGET_FREEBSD_NR_write: /* write(2) */ 245 ret = do_bsd_write(arg1, arg2, arg3); 246 break; 247 248 case TARGET_FREEBSD_NR_pwrite: /* pwrite(2) */ 249 ret = do_bsd_pwrite(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 250 break; 251 252 case TARGET_FREEBSD_NR_writev: /* writev(2) */ 253 ret = do_bsd_writev(arg1, arg2, arg3); 254 break; 255 256 case TARGET_FREEBSD_NR_pwritev: /* pwritev(2) */ 257 ret = do_bsd_pwritev(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 258 break; 259 260 case TARGET_FREEBSD_NR_open: /* open(2) */ 261 ret = do_bsd_open(arg1, arg2, arg3); 262 break; 263 264 case TARGET_FREEBSD_NR_openat: /* openat(2) */ 265 ret = do_bsd_openat(arg1, arg2, arg3, arg4); 266 break; 267 268 case TARGET_FREEBSD_NR_close: /* close(2) */ 269 ret = do_bsd_close(arg1); 270 break; 271 272 case TARGET_FREEBSD_NR_fdatasync: /* fdatasync(2) */ 273 ret = do_bsd_fdatasync(arg1); 274 break; 275 276 case TARGET_FREEBSD_NR_fsync: /* fsync(2) */ 277 ret = do_bsd_fsync(arg1); 278 break; 279 280 case TARGET_FREEBSD_NR_freebsd12_closefrom: /* closefrom(2) */ 281 ret = do_bsd_closefrom(arg1); 282 break; 283 284 case TARGET_FREEBSD_NR_revoke: /* revoke(2) */ 285 ret = do_bsd_revoke(arg1); 286 break; 287 288 case TARGET_FREEBSD_NR_access: /* access(2) */ 289 ret = do_bsd_access(arg1, arg2); 290 break; 291 292 case TARGET_FREEBSD_NR_eaccess: /* eaccess(2) */ 293 ret = do_bsd_eaccess(arg1, arg2); 294 break; 295 296 case TARGET_FREEBSD_NR_faccessat: /* faccessat(2) */ 297 ret = do_bsd_faccessat(arg1, arg2, arg3, arg4); 298 break; 299 300 case TARGET_FREEBSD_NR_chdir: /* chdir(2) */ 301 ret = do_bsd_chdir(arg1); 302 break; 303 304 case TARGET_FREEBSD_NR_fchdir: /* fchdir(2) */ 305 ret = do_bsd_fchdir(arg1); 306 break; 307 308 case TARGET_FREEBSD_NR_rename: /* rename(2) */ 309 ret = do_bsd_rename(arg1, arg2); 310 break; 311 312 case TARGET_FREEBSD_NR_renameat: /* renameat(2) */ 313 ret = do_bsd_renameat(arg1, arg2, arg3, arg4); 314 break; 315 316 case TARGET_FREEBSD_NR_link: /* link(2) */ 317 ret = do_bsd_link(arg1, arg2); 318 break; 319 320 case TARGET_FREEBSD_NR_linkat: /* linkat(2) */ 321 ret = do_bsd_linkat(arg1, arg2, arg3, arg4, arg5); 322 break; 323 324 case TARGET_FREEBSD_NR_unlink: /* unlink(2) */ 325 ret = do_bsd_unlink(arg1); 326 break; 327 328 case TARGET_FREEBSD_NR_unlinkat: /* unlinkat(2) */ 329 ret = do_bsd_unlinkat(arg1, arg2, arg3); 330 break; 331 332 case TARGET_FREEBSD_NR_mkdir: /* mkdir(2) */ 333 ret = do_bsd_mkdir(arg1, arg2); 334 break; 335 336 case TARGET_FREEBSD_NR_mkdirat: /* mkdirat(2) */ 337 ret = do_bsd_mkdirat(arg1, arg2, arg3); 338 break; 339 340 case TARGET_FREEBSD_NR_rmdir: /* rmdir(2) (XXX no rmdirat()?) */ 341 ret = do_bsd_rmdir(arg1); 342 break; 343 344 case TARGET_FREEBSD_NR___getcwd: /* undocumented __getcwd() */ 345 ret = do_bsd___getcwd(arg1, arg2); 346 break; 347 348 case TARGET_FREEBSD_NR_dup: /* dup(2) */ 349 ret = do_bsd_dup(arg1); 350 break; 351 352 case TARGET_FREEBSD_NR_dup2: /* dup2(2) */ 353 ret = do_bsd_dup2(arg1, arg2); 354 break; 355 356 case TARGET_FREEBSD_NR_truncate: /* truncate(2) */ 357 ret = do_bsd_truncate(cpu_env, arg1, arg2, arg3, arg4); 358 break; 359 360 case TARGET_FREEBSD_NR_ftruncate: /* ftruncate(2) */ 361 ret = do_bsd_ftruncate(cpu_env, arg1, arg2, arg3, arg4); 362 break; 363 364 case TARGET_FREEBSD_NR_acct: /* acct(2) */ 365 ret = do_bsd_acct(arg1); 366 break; 367 368 case TARGET_FREEBSD_NR_sync: /* sync(2) */ 369 ret = do_bsd_sync(); 370 break; 371 372 case TARGET_FREEBSD_NR_mount: /* mount(2) */ 373 ret = do_bsd_mount(arg1, arg2, arg3, arg4); 374 break; 375 376 case TARGET_FREEBSD_NR_unmount: /* unmount(2) */ 377 ret = do_bsd_unmount(arg1, arg2); 378 break; 379 380 case TARGET_FREEBSD_NR_nmount: /* nmount(2) */ 381 ret = do_bsd_nmount(arg1, arg2, arg3); 382 break; 383 384 case TARGET_FREEBSD_NR_symlink: /* symlink(2) */ 385 ret = do_bsd_symlink(arg1, arg2); 386 break; 387 388 case TARGET_FREEBSD_NR_symlinkat: /* symlinkat(2) */ 389 ret = do_bsd_symlinkat(arg1, arg2, arg3); 390 break; 391 392 case TARGET_FREEBSD_NR_readlink: /* readlink(2) */ 393 ret = do_bsd_readlink(cpu_env, arg1, arg2, arg3); 394 break; 395 396 case TARGET_FREEBSD_NR_readlinkat: /* readlinkat(2) */ 397 ret = do_bsd_readlinkat(arg1, arg2, arg3, arg4); 398 break; 399 400 case TARGET_FREEBSD_NR_chmod: /* chmod(2) */ 401 ret = do_bsd_chmod(arg1, arg2); 402 break; 403 404 case TARGET_FREEBSD_NR_fchmod: /* fchmod(2) */ 405 ret = do_bsd_fchmod(arg1, arg2); 406 break; 407 408 case TARGET_FREEBSD_NR_lchmod: /* lchmod(2) */ 409 ret = do_bsd_lchmod(arg1, arg2); 410 break; 411 412 case TARGET_FREEBSD_NR_fchmodat: /* fchmodat(2) */ 413 ret = do_bsd_fchmodat(arg1, arg2, arg3, arg4); 414 break; 415 416 case TARGET_FREEBSD_NR_freebsd11_mknod: /* mknod(2) */ 417 ret = do_bsd_freebsd11_mknod(arg1, arg2, arg3); 418 break; 419 420 case TARGET_FREEBSD_NR_freebsd11_mknodat: /* mknodat(2) */ 421 ret = do_bsd_freebsd11_mknodat(arg1, arg2, arg3, arg4); 422 break; 423 424 case TARGET_FREEBSD_NR_mknodat: /* mknodat(2) */ 425 ret = do_bsd_mknodat(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 426 break; 427 428 case TARGET_FREEBSD_NR_chown: /* chown(2) */ 429 ret = do_bsd_chown(arg1, arg2, arg3); 430 break; 431 432 case TARGET_FREEBSD_NR_fchown: /* fchown(2) */ 433 ret = do_bsd_fchown(arg1, arg2, arg3); 434 break; 435 436 case TARGET_FREEBSD_NR_lchown: /* lchown(2) */ 437 ret = do_bsd_lchown(arg1, arg2, arg3); 438 break; 439 440 case TARGET_FREEBSD_NR_fchownat: /* fchownat(2) */ 441 ret = do_bsd_fchownat(arg1, arg2, arg3, arg4, arg5); 442 break; 443 444 case TARGET_FREEBSD_NR_chflags: /* chflags(2) */ 445 ret = do_bsd_chflags(arg1, arg2); 446 break; 447 448 case TARGET_FREEBSD_NR_lchflags: /* lchflags(2) */ 449 ret = do_bsd_lchflags(arg1, arg2); 450 break; 451 452 case TARGET_FREEBSD_NR_fchflags: /* fchflags(2) */ 453 ret = do_bsd_fchflags(arg1, arg2); 454 break; 455 456 case TARGET_FREEBSD_NR_chroot: /* chroot(2) */ 457 ret = do_bsd_chroot(arg1); 458 break; 459 460 case TARGET_FREEBSD_NR_flock: /* flock(2) */ 461 ret = do_bsd_flock(arg1, arg2); 462 break; 463 464 case TARGET_FREEBSD_NR_mkfifo: /* mkfifo(2) */ 465 ret = do_bsd_mkfifo(arg1, arg2); 466 break; 467 468 case TARGET_FREEBSD_NR_mkfifoat: /* mkfifoat(2) */ 469 ret = do_bsd_mkfifoat(arg1, arg2, arg3); 470 break; 471 472 case TARGET_FREEBSD_NR_pathconf: /* pathconf(2) */ 473 ret = do_bsd_pathconf(arg1, arg2); 474 break; 475 476 case TARGET_FREEBSD_NR_lpathconf: /* lpathconf(2) */ 477 ret = do_bsd_lpathconf(arg1, arg2); 478 break; 479 480 case TARGET_FREEBSD_NR_fpathconf: /* fpathconf(2) */ 481 ret = do_bsd_fpathconf(arg1, arg2); 482 break; 483 484 case TARGET_FREEBSD_NR_undelete: /* undelete(2) */ 485 ret = do_bsd_undelete(arg1); 486 break; 487 488 /* 489 * stat system calls 490 */ 491 case TARGET_FREEBSD_NR_freebsd11_stat: /* stat(2) */ 492 ret = do_freebsd11_stat(arg1, arg2); 493 break; 494 495 case TARGET_FREEBSD_NR_freebsd11_lstat: /* lstat(2) */ 496 ret = do_freebsd11_lstat(arg1, arg2); 497 break; 498 499 case TARGET_FREEBSD_NR_freebsd11_fstat: /* fstat(2) */ 500 ret = do_freebsd11_fstat(arg1, arg2); 501 break; 502 503 case TARGET_FREEBSD_NR_fstat: /* fstat(2) */ 504 ret = do_freebsd_fstat(arg1, arg2); 505 break; 506 507 case TARGET_FREEBSD_NR_freebsd11_fstatat: /* fstatat(2) */ 508 ret = do_freebsd11_fstatat(arg1, arg2, arg3, arg4); 509 break; 510 511 case TARGET_FREEBSD_NR_fstatat: /* fstatat(2) */ 512 ret = do_freebsd_fstatat(arg1, arg2, arg3, arg4); 513 break; 514 515 case TARGET_FREEBSD_NR_freebsd11_nstat: /* undocumented */ 516 ret = do_freebsd11_nstat(arg1, arg2); 517 break; 518 519 case TARGET_FREEBSD_NR_freebsd11_nfstat: /* undocumented */ 520 ret = do_freebsd11_nfstat(arg1, arg2); 521 break; 522 523 case TARGET_FREEBSD_NR_freebsd11_nlstat: /* undocumented */ 524 ret = do_freebsd11_nlstat(arg1, arg2); 525 break; 526 527 /* 528 * sys{ctl, arch, call} 529 */ 530 case TARGET_FREEBSD_NR___sysctl: /* sysctl(3) */ 531 ret = do_freebsd_sysctl(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 532 break; 533 534 case TARGET_FREEBSD_NR___sysctlbyname: /* sysctlbyname(2) */ 535 ret = do_freebsd_sysctlbyname(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 536 break; 537 538 case TARGET_FREEBSD_NR_sysarch: /* sysarch(2) */ 539 ret = do_freebsd_sysarch(cpu_env, arg1, arg2); 540 break; 541 542 default: 543 qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); 544 ret = -TARGET_ENOSYS; 545 break; 546 } 547 548 return ret; 549 } 550 551 /* 552 * do_freebsd_syscall() should always have a single exit point at the end so 553 * that actions, such as logging of syscall results, can be performed. This 554 * as a wrapper around freebsd_syscall() so that actually happens. Since 555 * that is a singleton, modern compilers will inline it anyway... 556 */ 557 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1, 558 abi_long arg2, abi_long arg3, abi_long arg4, 559 abi_long arg5, abi_long arg6, abi_long arg7, 560 abi_long arg8) 561 { 562 abi_long ret; 563 564 if (do_strace) { 565 print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6); 566 } 567 568 ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6, 569 arg7, arg8); 570 if (do_strace) { 571 print_freebsd_syscall_ret(num, ret); 572 } 573 574 return ret; 575 } 576 577 void syscall_init(void) 578 { 579 } 580