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 21 /* 22 * We need the FreeBSD "legacy" definitions. Rust needs the FreeBSD 11 system 23 * calls since it doesn't use libc at all, so we have to emulate that despite 24 * FreeBSD 11 being EOL'd. 25 */ 26 #define _WANT_FREEBSD11_STAT 27 #define _WANT_FREEBSD11_STATFS 28 #define _WANT_FREEBSD11_DIRENT 29 #define _WANT_KERNEL_ERRNO 30 #define _WANT_SEMUN 31 #include "qemu/osdep.h" 32 #include "qemu/cutils.h" 33 #include "qemu/path.h" 34 #include <sys/syscall.h> 35 #include <sys/cdefs.h> 36 #include <sys/param.h> 37 #include <sys/mount.h> 38 #include <sys/sysctl.h> 39 #include <utime.h> 40 41 #include "include/gdbstub/syscalls.h" 42 43 #include "qemu.h" 44 #include "signal-common.h" 45 #include "user/syscall-trace.h" 46 47 #include "bsd-file.h" 48 #include "bsd-proc.h" 49 50 /* I/O */ 51 safe_syscall3(int, open, const char *, path, int, flags, mode_t, mode); 52 safe_syscall4(int, openat, int, fd, const char *, path, int, flags, mode_t, 53 mode); 54 55 safe_syscall3(ssize_t, read, int, fd, void *, buf, size_t, nbytes); 56 safe_syscall4(ssize_t, pread, int, fd, void *, buf, size_t, nbytes, off_t, 57 offset); 58 safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt); 59 safe_syscall4(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt, 60 off_t, offset); 61 62 safe_syscall3(ssize_t, write, int, fd, void *, buf, size_t, nbytes); 63 safe_syscall4(ssize_t, pwrite, int, fd, void *, buf, size_t, nbytes, off_t, 64 offset); 65 safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt); 66 safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt, 67 off_t, offset); 68 69 void target_set_brk(abi_ulong new_brk) 70 { 71 } 72 73 /* 74 * errno conversion. 75 */ 76 abi_long get_errno(abi_long ret) 77 { 78 if (ret == -1) { 79 return -host_to_target_errno(errno); 80 } else { 81 return ret; 82 } 83 } 84 85 int host_to_target_errno(int err) 86 { 87 /* 88 * All the BSDs have the property that the error numbers are uniform across 89 * all architectures for a given BSD, though they may vary between different 90 * BSDs. 91 */ 92 return err; 93 } 94 95 bool is_error(abi_long ret) 96 { 97 return (abi_ulong)ret >= (abi_ulong)(-4096); 98 } 99 100 /* 101 * Unlocks a iovec. Unlike unlock_iovec, it assumes the tvec array itself is 102 * already locked from target_addr. It will be unlocked as well as all the iovec 103 * elements. 104 */ 105 static void helper_unlock_iovec(struct target_iovec *target_vec, 106 abi_ulong target_addr, struct iovec *vec, 107 int count, int copy) 108 { 109 for (int i = 0; i < count; i++) { 110 abi_ulong base = tswapal(target_vec[i].iov_base); 111 112 if (vec[i].iov_base) { 113 unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0); 114 } 115 } 116 unlock_user(target_vec, target_addr, 0); 117 } 118 119 struct iovec *lock_iovec(int type, abi_ulong target_addr, 120 int count, int copy) 121 { 122 struct target_iovec *target_vec; 123 struct iovec *vec; 124 abi_ulong total_len, max_len; 125 int i; 126 int err = 0; 127 128 if (count == 0) { 129 errno = 0; 130 return NULL; 131 } 132 if (count < 0 || count > IOV_MAX) { 133 errno = EINVAL; 134 return NULL; 135 } 136 137 vec = g_try_new0(struct iovec, count); 138 if (vec == NULL) { 139 errno = ENOMEM; 140 return NULL; 141 } 142 143 target_vec = lock_user(VERIFY_READ, target_addr, 144 count * sizeof(struct target_iovec), 1); 145 if (target_vec == NULL) { 146 err = EFAULT; 147 goto fail2; 148 } 149 150 max_len = 0x7fffffff & MIN(TARGET_PAGE_MASK, PAGE_MASK); 151 total_len = 0; 152 153 for (i = 0; i < count; i++) { 154 abi_ulong base = tswapal(target_vec[i].iov_base); 155 abi_long len = tswapal(target_vec[i].iov_len); 156 157 if (len < 0) { 158 err = EINVAL; 159 goto fail; 160 } else if (len == 0) { 161 /* Zero length pointer is ignored. */ 162 vec[i].iov_base = 0; 163 } else { 164 vec[i].iov_base = lock_user(type, base, len, copy); 165 /* 166 * If the first buffer pointer is bad, this is a fault. But 167 * subsequent bad buffers will result in a partial write; this is 168 * realized by filling the vector with null pointers and zero 169 * lengths. 170 */ 171 if (!vec[i].iov_base) { 172 if (i == 0) { 173 err = EFAULT; 174 goto fail; 175 } else { 176 /* 177 * Fail all the subsequent addresses, they are already 178 * zero'd. 179 */ 180 goto out; 181 } 182 } 183 if (len > max_len - total_len) { 184 len = max_len - total_len; 185 } 186 } 187 vec[i].iov_len = len; 188 total_len += len; 189 } 190 out: 191 unlock_user(target_vec, target_addr, 0); 192 return vec; 193 194 fail: 195 helper_unlock_iovec(target_vec, target_addr, vec, i, copy); 196 fail2: 197 g_free(vec); 198 errno = err; 199 return NULL; 200 } 201 202 void unlock_iovec(struct iovec *vec, abi_ulong target_addr, 203 int count, int copy) 204 { 205 struct target_iovec *target_vec; 206 207 target_vec = lock_user(VERIFY_READ, target_addr, 208 count * sizeof(struct target_iovec), 1); 209 if (target_vec) { 210 helper_unlock_iovec(target_vec, target_addr, vec, count, copy); 211 } 212 213 g_free(vec); 214 } 215 216 /* 217 * All errnos that freebsd_syscall() returns must be -TARGET_<errcode>. 218 */ 219 static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1, 220 abi_long arg2, abi_long arg3, abi_long arg4, 221 abi_long arg5, abi_long arg6, abi_long arg7, 222 abi_long arg8) 223 { 224 abi_long ret; 225 226 switch (num) { 227 /* 228 * process system calls 229 */ 230 case TARGET_FREEBSD_NR_exit: /* exit(2) */ 231 ret = do_bsd_exit(cpu_env, arg1); 232 break; 233 234 /* 235 * File system calls. 236 */ 237 case TARGET_FREEBSD_NR_read: /* read(2) */ 238 ret = do_bsd_read(arg1, arg2, arg3); 239 break; 240 241 case TARGET_FREEBSD_NR_pread: /* pread(2) */ 242 ret = do_bsd_pread(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 243 break; 244 245 case TARGET_FREEBSD_NR_readv: /* readv(2) */ 246 ret = do_bsd_readv(arg1, arg2, arg3); 247 break; 248 249 case TARGET_FREEBSD_NR_preadv: /* preadv(2) */ 250 ret = do_bsd_preadv(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 251 252 case TARGET_FREEBSD_NR_write: /* write(2) */ 253 ret = do_bsd_write(arg1, arg2, arg3); 254 break; 255 256 case TARGET_FREEBSD_NR_pwrite: /* pwrite(2) */ 257 ret = do_bsd_pwrite(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 258 break; 259 260 case TARGET_FREEBSD_NR_writev: /* writev(2) */ 261 ret = do_bsd_writev(arg1, arg2, arg3); 262 break; 263 264 case TARGET_FREEBSD_NR_pwritev: /* pwritev(2) */ 265 ret = do_bsd_pwritev(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 266 break; 267 268 case TARGET_FREEBSD_NR_open: /* open(2) */ 269 ret = do_bsd_open(arg1, arg2, arg3); 270 break; 271 272 case TARGET_FREEBSD_NR_openat: /* openat(2) */ 273 ret = do_bsd_openat(arg1, arg2, arg3, arg4); 274 break; 275 276 case TARGET_FREEBSD_NR_close: /* close(2) */ 277 ret = do_bsd_close(arg1); 278 break; 279 280 case TARGET_FREEBSD_NR_fdatasync: /* fdatasync(2) */ 281 ret = do_bsd_fdatasync(arg1); 282 break; 283 284 case TARGET_FREEBSD_NR_fsync: /* fsync(2) */ 285 ret = do_bsd_fsync(arg1); 286 break; 287 288 case TARGET_FREEBSD_NR_freebsd12_closefrom: /* closefrom(2) */ 289 ret = do_bsd_closefrom(arg1); 290 break; 291 292 case TARGET_FREEBSD_NR_revoke: /* revoke(2) */ 293 ret = do_bsd_revoke(arg1); 294 break; 295 296 case TARGET_FREEBSD_NR_access: /* access(2) */ 297 ret = do_bsd_access(arg1, arg2); 298 break; 299 300 case TARGET_FREEBSD_NR_eaccess: /* eaccess(2) */ 301 ret = do_bsd_eaccess(arg1, arg2); 302 break; 303 304 case TARGET_FREEBSD_NR_faccessat: /* faccessat(2) */ 305 ret = do_bsd_faccessat(arg1, arg2, arg3, arg4); 306 break; 307 308 case TARGET_FREEBSD_NR_chdir: /* chdir(2) */ 309 ret = do_bsd_chdir(arg1); 310 break; 311 312 case TARGET_FREEBSD_NR_fchdir: /* fchdir(2) */ 313 ret = do_bsd_fchdir(arg1); 314 break; 315 316 case TARGET_FREEBSD_NR_rename: /* rename(2) */ 317 ret = do_bsd_rename(arg1, arg2); 318 break; 319 320 case TARGET_FREEBSD_NR_renameat: /* renameat(2) */ 321 ret = do_bsd_renameat(arg1, arg2, arg3, arg4); 322 break; 323 324 case TARGET_FREEBSD_NR_link: /* link(2) */ 325 ret = do_bsd_link(arg1, arg2); 326 break; 327 328 case TARGET_FREEBSD_NR_linkat: /* linkat(2) */ 329 ret = do_bsd_linkat(arg1, arg2, arg3, arg4, arg5); 330 break; 331 332 case TARGET_FREEBSD_NR_unlink: /* unlink(2) */ 333 ret = do_bsd_unlink(arg1); 334 break; 335 336 case TARGET_FREEBSD_NR_unlinkat: /* unlinkat(2) */ 337 ret = do_bsd_unlinkat(arg1, arg2, arg3); 338 break; 339 340 case TARGET_FREEBSD_NR_mkdir: /* mkdir(2) */ 341 ret = do_bsd_mkdir(arg1, arg2); 342 break; 343 344 case TARGET_FREEBSD_NR_mkdirat: /* mkdirat(2) */ 345 ret = do_bsd_mkdirat(arg1, arg2, arg3); 346 break; 347 348 case TARGET_FREEBSD_NR_rmdir: /* rmdir(2) (XXX no rmdirat()?) */ 349 ret = do_bsd_rmdir(arg1); 350 break; 351 352 case TARGET_FREEBSD_NR___getcwd: /* undocumented __getcwd() */ 353 ret = do_bsd___getcwd(arg1, arg2); 354 break; 355 356 case TARGET_FREEBSD_NR_dup: /* dup(2) */ 357 ret = do_bsd_dup(arg1); 358 break; 359 360 case TARGET_FREEBSD_NR_dup2: /* dup2(2) */ 361 ret = do_bsd_dup2(arg1, arg2); 362 break; 363 364 case TARGET_FREEBSD_NR_truncate: /* truncate(2) */ 365 ret = do_bsd_truncate(cpu_env, arg1, arg2, arg3, arg4); 366 break; 367 368 case TARGET_FREEBSD_NR_ftruncate: /* ftruncate(2) */ 369 ret = do_bsd_ftruncate(cpu_env, arg1, arg2, arg3, arg4); 370 break; 371 372 case TARGET_FREEBSD_NR_acct: /* acct(2) */ 373 ret = do_bsd_acct(arg1); 374 break; 375 376 case TARGET_FREEBSD_NR_sync: /* sync(2) */ 377 ret = do_bsd_sync(); 378 break; 379 380 case TARGET_FREEBSD_NR_mount: /* mount(2) */ 381 ret = do_bsd_mount(arg1, arg2, arg3, arg4); 382 break; 383 384 case TARGET_FREEBSD_NR_unmount: /* unmount(2) */ 385 ret = do_bsd_unmount(arg1, arg2); 386 break; 387 388 case TARGET_FREEBSD_NR_nmount: /* nmount(2) */ 389 ret = do_bsd_nmount(arg1, arg2, arg3); 390 break; 391 392 case TARGET_FREEBSD_NR_symlink: /* symlink(2) */ 393 ret = do_bsd_symlink(arg1, arg2); 394 break; 395 396 case TARGET_FREEBSD_NR_symlinkat: /* symlinkat(2) */ 397 ret = do_bsd_symlinkat(arg1, arg2, arg3); 398 break; 399 400 case TARGET_FREEBSD_NR_readlink: /* readlink(2) */ 401 ret = do_bsd_readlink(cpu_env, arg1, arg2, arg3); 402 break; 403 404 case TARGET_FREEBSD_NR_readlinkat: /* readlinkat(2) */ 405 ret = do_bsd_readlinkat(arg1, arg2, arg3, arg4); 406 break; 407 408 case TARGET_FREEBSD_NR_chmod: /* chmod(2) */ 409 ret = do_bsd_chmod(arg1, arg2); 410 break; 411 412 case TARGET_FREEBSD_NR_fchmod: /* fchmod(2) */ 413 ret = do_bsd_fchmod(arg1, arg2); 414 break; 415 416 case TARGET_FREEBSD_NR_lchmod: /* lchmod(2) */ 417 ret = do_bsd_lchmod(arg1, arg2); 418 break; 419 420 case TARGET_FREEBSD_NR_fchmodat: /* fchmodat(2) */ 421 ret = do_bsd_fchmodat(arg1, arg2, arg3, arg4); 422 break; 423 424 case TARGET_FREEBSD_NR_freebsd11_mknod: /* mknod(2) */ 425 ret = do_bsd_freebsd11_mknod(arg1, arg2, arg3); 426 break; 427 428 case TARGET_FREEBSD_NR_freebsd11_mknodat: /* mknodat(2) */ 429 ret = do_bsd_freebsd11_mknodat(arg1, arg2, arg3, arg4); 430 break; 431 432 case TARGET_FREEBSD_NR_mknodat: /* mknodat(2) */ 433 ret = do_bsd_mknodat(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 434 break; 435 436 case TARGET_FREEBSD_NR_chown: /* chown(2) */ 437 ret = do_bsd_chown(arg1, arg2, arg3); 438 break; 439 440 case TARGET_FREEBSD_NR_fchown: /* fchown(2) */ 441 ret = do_bsd_fchown(arg1, arg2, arg3); 442 break; 443 444 case TARGET_FREEBSD_NR_lchown: /* lchown(2) */ 445 ret = do_bsd_lchown(arg1, arg2, arg3); 446 break; 447 448 case TARGET_FREEBSD_NR_fchownat: /* fchownat(2) */ 449 ret = do_bsd_fchownat(arg1, arg2, arg3, arg4, arg5); 450 break; 451 452 case TARGET_FREEBSD_NR_chflags: /* chflags(2) */ 453 ret = do_bsd_chflags(arg1, arg2); 454 break; 455 456 case TARGET_FREEBSD_NR_lchflags: /* lchflags(2) */ 457 ret = do_bsd_lchflags(arg1, arg2); 458 break; 459 460 case TARGET_FREEBSD_NR_fchflags: /* fchflags(2) */ 461 ret = do_bsd_fchflags(arg1, arg2); 462 break; 463 464 case TARGET_FREEBSD_NR_chroot: /* chroot(2) */ 465 ret = do_bsd_chroot(arg1); 466 break; 467 468 case TARGET_FREEBSD_NR_flock: /* flock(2) */ 469 ret = do_bsd_flock(arg1, arg2); 470 break; 471 472 case TARGET_FREEBSD_NR_mkfifo: /* mkfifo(2) */ 473 ret = do_bsd_mkfifo(arg1, arg2); 474 break; 475 476 case TARGET_FREEBSD_NR_mkfifoat: /* mkfifoat(2) */ 477 ret = do_bsd_mkfifoat(arg1, arg2, arg3); 478 break; 479 480 case TARGET_FREEBSD_NR_pathconf: /* pathconf(2) */ 481 ret = do_bsd_pathconf(arg1, arg2); 482 break; 483 484 case TARGET_FREEBSD_NR_lpathconf: /* lpathconf(2) */ 485 ret = do_bsd_lpathconf(arg1, arg2); 486 break; 487 488 case TARGET_FREEBSD_NR_fpathconf: /* fpathconf(2) */ 489 ret = do_bsd_fpathconf(arg1, arg2); 490 break; 491 492 case TARGET_FREEBSD_NR_undelete: /* undelete(2) */ 493 ret = do_bsd_undelete(arg1); 494 break; 495 496 /* 497 * sys{ctl, arch, call} 498 */ 499 case TARGET_FREEBSD_NR___sysctl: /* sysctl(3) */ 500 ret = do_freebsd_sysctl(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 501 break; 502 503 case TARGET_FREEBSD_NR___sysctlbyname: /* sysctlbyname(2) */ 504 ret = do_freebsd_sysctlbyname(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 505 break; 506 507 case TARGET_FREEBSD_NR_sysarch: /* sysarch(2) */ 508 ret = do_freebsd_sysarch(cpu_env, arg1, arg2); 509 break; 510 511 default: 512 qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); 513 ret = -TARGET_ENOSYS; 514 break; 515 } 516 517 return ret; 518 } 519 520 /* 521 * do_freebsd_syscall() should always have a single exit point at the end so 522 * that actions, such as logging of syscall results, can be performed. This 523 * as a wrapper around freebsd_syscall() so that actually happens. Since 524 * that is a singleton, modern compilers will inline it anyway... 525 */ 526 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1, 527 abi_long arg2, abi_long arg3, abi_long arg4, 528 abi_long arg5, abi_long arg6, abi_long arg7, 529 abi_long arg8) 530 { 531 abi_long ret; 532 533 if (do_strace) { 534 print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6); 535 } 536 537 ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6, 538 arg7, arg8); 539 if (do_strace) { 540 print_freebsd_syscall_ret(num, ret); 541 } 542 543 return ret; 544 } 545 546 void syscall_init(void) 547 { 548 } 549