os-syscall.c (15390B)
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 "qemu.h" 42 #include "signal-common.h" 43 #include "user/syscall-trace.h" 44 45 #include "bsd-file.h" 46 #include "bsd-proc.h" 47 48 /* I/O */ 49 safe_syscall3(int, open, const char *, path, int, flags, mode_t, mode); 50 safe_syscall4(int, openat, int, fd, const char *, path, int, flags, mode_t, 51 mode); 52 53 safe_syscall3(ssize_t, read, int, fd, void *, buf, size_t, nbytes); 54 safe_syscall4(ssize_t, pread, int, fd, void *, buf, size_t, nbytes, off_t, 55 offset); 56 safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt); 57 safe_syscall4(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt, 58 off_t, offset); 59 60 safe_syscall3(ssize_t, write, int, fd, void *, buf, size_t, nbytes); 61 safe_syscall4(ssize_t, pwrite, int, fd, void *, buf, size_t, nbytes, off_t, 62 offset); 63 safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt); 64 safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt, 65 off_t, offset); 66 67 void target_set_brk(abi_ulong new_brk) 68 { 69 } 70 71 /* 72 * errno conversion. 73 */ 74 abi_long get_errno(abi_long ret) 75 { 76 if (ret == -1) { 77 return -host_to_target_errno(errno); 78 } else { 79 return ret; 80 } 81 } 82 83 int host_to_target_errno(int err) 84 { 85 /* 86 * All the BSDs have the property that the error numbers are uniform across 87 * all architectures for a given BSD, though they may vary between different 88 * BSDs. 89 */ 90 return err; 91 } 92 93 bool is_error(abi_long ret) 94 { 95 return (abi_ulong)ret >= (abi_ulong)(-4096); 96 } 97 98 /* 99 * Unlocks a iovec. Unlike unlock_iovec, it assumes the tvec array itself is 100 * already locked from target_addr. It will be unlocked as well as all the iovec 101 * elements. 102 */ 103 static void helper_unlock_iovec(struct target_iovec *target_vec, 104 abi_ulong target_addr, struct iovec *vec, 105 int count, int copy) 106 { 107 for (int i = 0; i < count; i++) { 108 abi_ulong base = tswapal(target_vec[i].iov_base); 109 110 if (vec[i].iov_base) { 111 unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0); 112 } 113 } 114 unlock_user(target_vec, target_addr, 0); 115 } 116 117 struct iovec *lock_iovec(int type, abi_ulong target_addr, 118 int count, int copy) 119 { 120 struct target_iovec *target_vec; 121 struct iovec *vec; 122 abi_ulong total_len, max_len; 123 int i; 124 int err = 0; 125 126 if (count == 0) { 127 errno = 0; 128 return NULL; 129 } 130 if (count < 0 || count > IOV_MAX) { 131 errno = EINVAL; 132 return NULL; 133 } 134 135 vec = g_try_new0(struct iovec, count); 136 if (vec == NULL) { 137 errno = ENOMEM; 138 return NULL; 139 } 140 141 target_vec = lock_user(VERIFY_READ, target_addr, 142 count * sizeof(struct target_iovec), 1); 143 if (target_vec == NULL) { 144 err = EFAULT; 145 goto fail2; 146 } 147 148 max_len = 0x7fffffff & MIN(TARGET_PAGE_MASK, PAGE_MASK); 149 total_len = 0; 150 151 for (i = 0; i < count; i++) { 152 abi_ulong base = tswapal(target_vec[i].iov_base); 153 abi_long len = tswapal(target_vec[i].iov_len); 154 155 if (len < 0) { 156 err = EINVAL; 157 goto fail; 158 } else if (len == 0) { 159 /* Zero length pointer is ignored. */ 160 vec[i].iov_base = 0; 161 } else { 162 vec[i].iov_base = lock_user(type, base, len, copy); 163 /* 164 * If the first buffer pointer is bad, this is a fault. But 165 * subsequent bad buffers will result in a partial write; this is 166 * realized by filling the vector with null pointers and zero 167 * lengths. 168 */ 169 if (!vec[i].iov_base) { 170 if (i == 0) { 171 err = EFAULT; 172 goto fail; 173 } else { 174 /* 175 * Fail all the subsequent addresses, they are already 176 * zero'd. 177 */ 178 goto out; 179 } 180 } 181 if (len > max_len - total_len) { 182 len = max_len - total_len; 183 } 184 } 185 vec[i].iov_len = len; 186 total_len += len; 187 } 188 out: 189 unlock_user(target_vec, target_addr, 0); 190 return vec; 191 192 fail: 193 helper_unlock_iovec(target_vec, target_addr, vec, i, copy); 194 fail2: 195 g_free(vec); 196 errno = err; 197 return NULL; 198 } 199 200 void unlock_iovec(struct iovec *vec, abi_ulong target_addr, 201 int count, int copy) 202 { 203 struct target_iovec *target_vec; 204 205 target_vec = lock_user(VERIFY_READ, target_addr, 206 count * sizeof(struct target_iovec), 1); 207 if (target_vec) { 208 helper_unlock_iovec(target_vec, target_addr, vec, count, copy); 209 } 210 211 g_free(vec); 212 } 213 214 /* 215 * All errnos that freebsd_syscall() returns must be -TARGET_<errcode>. 216 */ 217 static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1, 218 abi_long arg2, abi_long arg3, abi_long arg4, 219 abi_long arg5, abi_long arg6, abi_long arg7, 220 abi_long arg8) 221 { 222 abi_long ret; 223 224 switch (num) { 225 /* 226 * process system calls 227 */ 228 case TARGET_FREEBSD_NR_exit: /* exit(2) */ 229 ret = do_bsd_exit(cpu_env, arg1); 230 break; 231 232 /* 233 * File system calls. 234 */ 235 case TARGET_FREEBSD_NR_read: /* read(2) */ 236 ret = do_bsd_read(arg1, arg2, arg3); 237 break; 238 239 case TARGET_FREEBSD_NR_pread: /* pread(2) */ 240 ret = do_bsd_pread(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 241 break; 242 243 case TARGET_FREEBSD_NR_readv: /* readv(2) */ 244 ret = do_bsd_readv(arg1, arg2, arg3); 245 break; 246 247 case TARGET_FREEBSD_NR_preadv: /* preadv(2) */ 248 ret = do_bsd_preadv(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 249 250 case TARGET_FREEBSD_NR_write: /* write(2) */ 251 ret = do_bsd_write(arg1, arg2, arg3); 252 break; 253 254 case TARGET_FREEBSD_NR_pwrite: /* pwrite(2) */ 255 ret = do_bsd_pwrite(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 256 break; 257 258 case TARGET_FREEBSD_NR_writev: /* writev(2) */ 259 ret = do_bsd_writev(arg1, arg2, arg3); 260 break; 261 262 case TARGET_FREEBSD_NR_pwritev: /* pwritev(2) */ 263 ret = do_bsd_pwritev(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 264 break; 265 266 case TARGET_FREEBSD_NR_open: /* open(2) */ 267 ret = do_bsd_open(arg1, arg2, arg3); 268 break; 269 270 case TARGET_FREEBSD_NR_openat: /* openat(2) */ 271 ret = do_bsd_openat(arg1, arg2, arg3, arg4); 272 break; 273 274 case TARGET_FREEBSD_NR_close: /* close(2) */ 275 ret = do_bsd_close(arg1); 276 break; 277 278 case TARGET_FREEBSD_NR_fdatasync: /* fdatasync(2) */ 279 ret = do_bsd_fdatasync(arg1); 280 break; 281 282 case TARGET_FREEBSD_NR_fsync: /* fsync(2) */ 283 ret = do_bsd_fsync(arg1); 284 break; 285 286 case TARGET_FREEBSD_NR_freebsd12_closefrom: /* closefrom(2) */ 287 ret = do_bsd_closefrom(arg1); 288 break; 289 290 case TARGET_FREEBSD_NR_revoke: /* revoke(2) */ 291 ret = do_bsd_revoke(arg1); 292 break; 293 294 case TARGET_FREEBSD_NR_access: /* access(2) */ 295 ret = do_bsd_access(arg1, arg2); 296 break; 297 298 case TARGET_FREEBSD_NR_eaccess: /* eaccess(2) */ 299 ret = do_bsd_eaccess(arg1, arg2); 300 break; 301 302 case TARGET_FREEBSD_NR_faccessat: /* faccessat(2) */ 303 ret = do_bsd_faccessat(arg1, arg2, arg3, arg4); 304 break; 305 306 case TARGET_FREEBSD_NR_chdir: /* chdir(2) */ 307 ret = do_bsd_chdir(arg1); 308 break; 309 310 case TARGET_FREEBSD_NR_fchdir: /* fchdir(2) */ 311 ret = do_bsd_fchdir(arg1); 312 break; 313 314 case TARGET_FREEBSD_NR_rename: /* rename(2) */ 315 ret = do_bsd_rename(arg1, arg2); 316 break; 317 318 case TARGET_FREEBSD_NR_renameat: /* renameat(2) */ 319 ret = do_bsd_renameat(arg1, arg2, arg3, arg4); 320 break; 321 322 case TARGET_FREEBSD_NR_link: /* link(2) */ 323 ret = do_bsd_link(arg1, arg2); 324 break; 325 326 case TARGET_FREEBSD_NR_linkat: /* linkat(2) */ 327 ret = do_bsd_linkat(arg1, arg2, arg3, arg4, arg5); 328 break; 329 330 case TARGET_FREEBSD_NR_unlink: /* unlink(2) */ 331 ret = do_bsd_unlink(arg1); 332 break; 333 334 case TARGET_FREEBSD_NR_unlinkat: /* unlinkat(2) */ 335 ret = do_bsd_unlinkat(arg1, arg2, arg3); 336 break; 337 338 case TARGET_FREEBSD_NR_mkdir: /* mkdir(2) */ 339 ret = do_bsd_mkdir(arg1, arg2); 340 break; 341 342 case TARGET_FREEBSD_NR_mkdirat: /* mkdirat(2) */ 343 ret = do_bsd_mkdirat(arg1, arg2, arg3); 344 break; 345 346 case TARGET_FREEBSD_NR_rmdir: /* rmdir(2) (XXX no rmdirat()?) */ 347 ret = do_bsd_rmdir(arg1); 348 break; 349 350 case TARGET_FREEBSD_NR___getcwd: /* undocumented __getcwd() */ 351 ret = do_bsd___getcwd(arg1, arg2); 352 break; 353 354 case TARGET_FREEBSD_NR_dup: /* dup(2) */ 355 ret = do_bsd_dup(arg1); 356 break; 357 358 case TARGET_FREEBSD_NR_dup2: /* dup2(2) */ 359 ret = do_bsd_dup2(arg1, arg2); 360 break; 361 362 case TARGET_FREEBSD_NR_truncate: /* truncate(2) */ 363 ret = do_bsd_truncate(cpu_env, arg1, arg2, arg3, arg4); 364 break; 365 366 case TARGET_FREEBSD_NR_ftruncate: /* ftruncate(2) */ 367 ret = do_bsd_ftruncate(cpu_env, arg1, arg2, arg3, arg4); 368 break; 369 370 case TARGET_FREEBSD_NR_acct: /* acct(2) */ 371 ret = do_bsd_acct(arg1); 372 break; 373 374 case TARGET_FREEBSD_NR_sync: /* sync(2) */ 375 ret = do_bsd_sync(); 376 break; 377 378 case TARGET_FREEBSD_NR_mount: /* mount(2) */ 379 ret = do_bsd_mount(arg1, arg2, arg3, arg4); 380 break; 381 382 case TARGET_FREEBSD_NR_unmount: /* unmount(2) */ 383 ret = do_bsd_unmount(arg1, arg2); 384 break; 385 386 case TARGET_FREEBSD_NR_nmount: /* nmount(2) */ 387 ret = do_bsd_nmount(arg1, arg2, arg3); 388 break; 389 390 case TARGET_FREEBSD_NR_symlink: /* symlink(2) */ 391 ret = do_bsd_symlink(arg1, arg2); 392 break; 393 394 case TARGET_FREEBSD_NR_symlinkat: /* symlinkat(2) */ 395 ret = do_bsd_symlinkat(arg1, arg2, arg3); 396 break; 397 398 case TARGET_FREEBSD_NR_readlink: /* readlink(2) */ 399 ret = do_bsd_readlink(cpu_env, arg1, arg2, arg3); 400 break; 401 402 case TARGET_FREEBSD_NR_readlinkat: /* readlinkat(2) */ 403 ret = do_bsd_readlinkat(arg1, arg2, arg3, arg4); 404 break; 405 406 case TARGET_FREEBSD_NR_chmod: /* chmod(2) */ 407 ret = do_bsd_chmod(arg1, arg2); 408 break; 409 410 case TARGET_FREEBSD_NR_fchmod: /* fchmod(2) */ 411 ret = do_bsd_fchmod(arg1, arg2); 412 break; 413 414 case TARGET_FREEBSD_NR_lchmod: /* lchmod(2) */ 415 ret = do_bsd_lchmod(arg1, arg2); 416 break; 417 418 case TARGET_FREEBSD_NR_fchmodat: /* fchmodat(2) */ 419 ret = do_bsd_fchmodat(arg1, arg2, arg3, arg4); 420 break; 421 422 case TARGET_FREEBSD_NR_freebsd11_mknod: /* mknod(2) */ 423 ret = do_bsd_freebsd11_mknod(arg1, arg2, arg3); 424 break; 425 426 case TARGET_FREEBSD_NR_freebsd11_mknodat: /* mknodat(2) */ 427 ret = do_bsd_freebsd11_mknodat(arg1, arg2, arg3, arg4); 428 break; 429 430 case TARGET_FREEBSD_NR_mknodat: /* mknodat(2) */ 431 ret = do_bsd_mknodat(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6); 432 break; 433 434 case TARGET_FREEBSD_NR_chown: /* chown(2) */ 435 ret = do_bsd_chown(arg1, arg2, arg3); 436 break; 437 438 case TARGET_FREEBSD_NR_fchown: /* fchown(2) */ 439 ret = do_bsd_fchown(arg1, arg2, arg3); 440 break; 441 442 case TARGET_FREEBSD_NR_lchown: /* lchown(2) */ 443 ret = do_bsd_lchown(arg1, arg2, arg3); 444 break; 445 446 case TARGET_FREEBSD_NR_fchownat: /* fchownat(2) */ 447 ret = do_bsd_fchownat(arg1, arg2, arg3, arg4, arg5); 448 break; 449 450 case TARGET_FREEBSD_NR_chflags: /* chflags(2) */ 451 ret = do_bsd_chflags(arg1, arg2); 452 break; 453 454 case TARGET_FREEBSD_NR_lchflags: /* lchflags(2) */ 455 ret = do_bsd_lchflags(arg1, arg2); 456 break; 457 458 case TARGET_FREEBSD_NR_fchflags: /* fchflags(2) */ 459 ret = do_bsd_fchflags(arg1, arg2); 460 break; 461 462 case TARGET_FREEBSD_NR_chroot: /* chroot(2) */ 463 ret = do_bsd_chroot(arg1); 464 break; 465 466 case TARGET_FREEBSD_NR_flock: /* flock(2) */ 467 ret = do_bsd_flock(arg1, arg2); 468 break; 469 470 case TARGET_FREEBSD_NR_mkfifo: /* mkfifo(2) */ 471 ret = do_bsd_mkfifo(arg1, arg2); 472 break; 473 474 case TARGET_FREEBSD_NR_mkfifoat: /* mkfifoat(2) */ 475 ret = do_bsd_mkfifoat(arg1, arg2, arg3); 476 break; 477 478 case TARGET_FREEBSD_NR_pathconf: /* pathconf(2) */ 479 ret = do_bsd_pathconf(arg1, arg2); 480 break; 481 482 case TARGET_FREEBSD_NR_lpathconf: /* lpathconf(2) */ 483 ret = do_bsd_lpathconf(arg1, arg2); 484 break; 485 486 case TARGET_FREEBSD_NR_fpathconf: /* fpathconf(2) */ 487 ret = do_bsd_fpathconf(arg1, arg2); 488 break; 489 490 case TARGET_FREEBSD_NR_undelete: /* undelete(2) */ 491 ret = do_bsd_undelete(arg1); 492 break; 493 494 default: 495 qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); 496 ret = -TARGET_ENOSYS; 497 break; 498 } 499 500 return ret; 501 } 502 503 /* 504 * do_freebsd_syscall() should always have a single exit point at the end so 505 * that actions, such as logging of syscall results, can be performed. This 506 * as a wrapper around freebsd_syscall() so that actually happens. Since 507 * that is a singleton, modern compilers will inline it anyway... 508 */ 509 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1, 510 abi_long arg2, abi_long arg3, abi_long arg4, 511 abi_long arg5, abi_long arg6, abi_long arg7, 512 abi_long arg8) 513 { 514 CPUState *cpu = env_cpu(cpu_env); 515 int ret; 516 517 trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8); 518 if (do_strace) { 519 print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6); 520 } 521 522 ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6, 523 arg7, arg8); 524 if (do_strace) { 525 print_freebsd_syscall_ret(num, ret); 526 } 527 trace_guest_user_syscall_ret(cpu, num, ret); 528 529 return ret; 530 } 531 532 void syscall_init(void) 533 { 534 }