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