Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_machdep.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 2000 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/capsicum.h> 34 #include <sys/fcntl.h> 35 #include <sys/file.h> 36 #include <sys/imgact.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mman.h> 40 #include <sys/mutex.h> 41 #include <sys/priv.h> 42 #include <sys/proc.h> 43 #include <sys/queue.h> 44 #include <sys/resource.h> 45 #include <sys/resourcevar.h> 46 #include <sys/sched.h> 47 #include <sys/signalvar.h> 48 #include <sys/syscallsubr.h> 49 #include <sys/sysproto.h> 50 #include <sys/systm.h> 51 #include <sys/sx.h> 52 #include <sys/unistd.h> 53 #include <sys/wait.h> 54 55 #include <machine/frame.h> 56 #include <machine/psl.h> 57 #include <machine/segments.h> 58 #include <machine/sysarch.h> 59 60 #include <vm/pmap.h> 61 #include <vm/vm.h> 62 #include <vm/vm_map.h> 63 64 #include <i386/linux/linux.h> 65 #include <i386/linux/linux_proto.h> 66 #include <compat/linux/linux_emul.h> 67 #include <compat/linux/linux_ipc.h> 68 #include <compat/linux/linux_misc.h> 69 #include <compat/linux/linux_mmap.h> 70 #include <compat/linux/linux_signal.h> 71 #include <compat/linux/linux_util.h> 72 73 #include <i386/include/pcb.h> /* needed for pcb definition in linux_set_thread_area */ 74 75 #include "opt_posix.h" 76 77 extern struct sysentvec elf32_freebsd_sysvec; /* defined in i386/i386/elf_machdep.c */ 78 79 struct l_descriptor { 80 l_uint entry_number; 81 l_ulong base_addr; 82 l_uint limit; 83 l_uint seg_32bit:1; 84 l_uint contents:2; 85 l_uint read_exec_only:1; 86 l_uint limit_in_pages:1; 87 l_uint seg_not_present:1; 88 l_uint useable:1; 89 }; 90 91 struct l_old_select_argv { 92 l_int nfds; 93 l_fd_set *readfds; 94 l_fd_set *writefds; 95 l_fd_set *exceptfds; 96 struct l_timeval *timeout; 97 }; 98 99 100 int 101 linux_execve(struct thread *td, struct linux_execve_args *args) 102 { 103 struct image_args eargs; 104 char *newpath; 105 int error; 106 107 LCONVPATHEXIST(td, args->path, &newpath); 108 109 #ifdef DEBUG 110 if (ldebug(execve)) 111 printf(ARGS(execve, "%s"), newpath); 112 #endif 113 114 error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE, 115 args->argp, args->envp); 116 free(newpath, M_TEMP); 117 if (error == 0) 118 error = linux_common_execve(td, &eargs); 119 return (error); 120 } 121 122 struct l_ipc_kludge { 123 struct l_msgbuf *msgp; 124 l_long msgtyp; 125 }; 126 127 int 128 linux_ipc(struct thread *td, struct linux_ipc_args *args) 129 { 130 131 switch (args->what & 0xFFFF) { 132 case LINUX_SEMOP: { 133 struct linux_semop_args a; 134 135 a.semid = args->arg1; 136 a.tsops = PTRIN(args->ptr); 137 a.nsops = args->arg2; 138 return (linux_semop(td, &a)); 139 } 140 case LINUX_SEMGET: { 141 struct linux_semget_args a; 142 143 a.key = args->arg1; 144 a.nsems = args->arg2; 145 a.semflg = args->arg3; 146 return (linux_semget(td, &a)); 147 } 148 case LINUX_SEMCTL: { 149 struct linux_semctl_args a; 150 int error; 151 152 a.semid = args->arg1; 153 a.semnum = args->arg2; 154 a.cmd = args->arg3; 155 error = copyin(PTRIN(args->ptr), &a.arg, sizeof(a.arg)); 156 if (error) 157 return (error); 158 return (linux_semctl(td, &a)); 159 } 160 case LINUX_MSGSND: { 161 struct linux_msgsnd_args a; 162 163 a.msqid = args->arg1; 164 a.msgp = PTRIN(args->ptr); 165 a.msgsz = args->arg2; 166 a.msgflg = args->arg3; 167 return (linux_msgsnd(td, &a)); 168 } 169 case LINUX_MSGRCV: { 170 struct linux_msgrcv_args a; 171 172 a.msqid = args->arg1; 173 a.msgsz = args->arg2; 174 a.msgflg = args->arg3; 175 if ((args->what >> 16) == 0) { 176 struct l_ipc_kludge tmp; 177 int error; 178 179 if (args->ptr == 0) 180 return (EINVAL); 181 error = copyin(PTRIN(args->ptr), &tmp, sizeof(tmp)); 182 if (error) 183 return (error); 184 a.msgp = PTRIN(tmp.msgp); 185 a.msgtyp = tmp.msgtyp; 186 } else { 187 a.msgp = PTRIN(args->ptr); 188 a.msgtyp = args->arg5; 189 } 190 return (linux_msgrcv(td, &a)); 191 } 192 case LINUX_MSGGET: { 193 struct linux_msgget_args a; 194 195 a.key = args->arg1; 196 a.msgflg = args->arg2; 197 return (linux_msgget(td, &a)); 198 } 199 case LINUX_MSGCTL: { 200 struct linux_msgctl_args a; 201 202 a.msqid = args->arg1; 203 a.cmd = args->arg2; 204 a.buf = PTRIN(args->ptr); 205 return (linux_msgctl(td, &a)); 206 } 207 case LINUX_SHMAT: { 208 struct linux_shmat_args a; 209 l_uintptr_t addr; 210 int error; 211 212 a.shmid = args->arg1; 213 a.shmaddr = PTRIN(args->ptr); 214 a.shmflg = args->arg2; 215 error = linux_shmat(td, &a); 216 if (error != 0) 217 return (error); 218 addr = td->td_retval[0]; 219 error = copyout(&addr, PTRIN(args->arg3), sizeof(addr)); 220 td->td_retval[0] = 0; 221 return (error); 222 } 223 case LINUX_SHMDT: { 224 struct linux_shmdt_args a; 225 226 a.shmaddr = PTRIN(args->ptr); 227 return (linux_shmdt(td, &a)); 228 } 229 case LINUX_SHMGET: { 230 struct linux_shmget_args a; 231 232 a.key = args->arg1; 233 a.size = args->arg2; 234 a.shmflg = args->arg3; 235 return (linux_shmget(td, &a)); 236 } 237 case LINUX_SHMCTL: { 238 struct linux_shmctl_args a; 239 240 a.shmid = args->arg1; 241 a.cmd = args->arg2; 242 a.buf = PTRIN(args->ptr); 243 return (linux_shmctl(td, &a)); 244 } 245 default: 246 break; 247 } 248 249 return (EINVAL); 250 } 251 252 int 253 linux_old_select(struct thread *td, struct linux_old_select_args *args) 254 { 255 struct l_old_select_argv linux_args; 256 struct linux_select_args newsel; 257 int error; 258 259 #ifdef DEBUG 260 if (ldebug(old_select)) 261 printf(ARGS(old_select, "%p"), args->ptr); 262 #endif 263 264 error = copyin(args->ptr, &linux_args, sizeof(linux_args)); 265 if (error) 266 return (error); 267 268 newsel.nfds = linux_args.nfds; 269 newsel.readfds = linux_args.readfds; 270 newsel.writefds = linux_args.writefds; 271 newsel.exceptfds = linux_args.exceptfds; 272 newsel.timeout = linux_args.timeout; 273 return (linux_select(td, &newsel)); 274 } 275 276 int 277 linux_set_cloned_tls(struct thread *td, void *desc) 278 { 279 struct segment_descriptor sd; 280 struct l_user_desc info; 281 int idx, error; 282 int a[2]; 283 284 error = copyin(desc, &info, sizeof(struct l_user_desc)); 285 if (error) { 286 printf(LMSG("copyin failed!")); 287 } else { 288 idx = info.entry_number; 289 290 /* 291 * looks like we're getting the idx we returned 292 * in the set_thread_area() syscall 293 */ 294 if (idx != 6 && idx != 3) { 295 printf(LMSG("resetting idx!")); 296 idx = 3; 297 } 298 299 /* this doesnt happen in practice */ 300 if (idx == 6) { 301 /* we might copy out the entry_number as 3 */ 302 info.entry_number = 3; 303 error = copyout(&info, desc, sizeof(struct l_user_desc)); 304 if (error) 305 printf(LMSG("copyout failed!")); 306 } 307 308 a[0] = LINUX_LDT_entry_a(&info); 309 a[1] = LINUX_LDT_entry_b(&info); 310 311 memcpy(&sd, &a, sizeof(a)); 312 #ifdef DEBUG 313 if (ldebug(clone)) 314 printf("Segment created in clone with " 315 "CLONE_SETTLS: lobase: %x, hibase: %x, " 316 "lolimit: %x, hilimit: %x, type: %i, " 317 "dpl: %i, p: %i, xx: %i, def32: %i, " 318 "gran: %i\n", sd.sd_lobase, sd.sd_hibase, 319 sd.sd_lolimit, sd.sd_hilimit, sd.sd_type, 320 sd.sd_dpl, sd.sd_p, sd.sd_xx, 321 sd.sd_def32, sd.sd_gran); 322 #endif 323 324 /* set %gs */ 325 td->td_pcb->pcb_gsd = sd; 326 td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL); 327 } 328 329 return (error); 330 } 331 332 int 333 linux_set_upcall_kse(struct thread *td, register_t stack) 334 { 335 336 if (stack) 337 td->td_frame->tf_esp = stack; 338 339 /* 340 * The newly created Linux thread returns 341 * to the user space by the same path that a parent do. 342 */ 343 td->td_frame->tf_eax = 0; 344 return (0); 345 } 346 347 int 348 linux_mmap2(struct thread *td, struct linux_mmap2_args *args) 349 { 350 351 #ifdef DEBUG 352 if (ldebug(mmap2)) 353 printf(ARGS(mmap2, "%p, %d, %d, 0x%08x, %d, %d"), 354 (void *)args->addr, args->len, args->prot, 355 args->flags, args->fd, args->pgoff); 356 #endif 357 358 return (linux_mmap_common(td, args->addr, args->len, args->prot, 359 args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff * 360 PAGE_SIZE)); 361 } 362 363 int 364 linux_mmap(struct thread *td, struct linux_mmap_args *args) 365 { 366 int error; 367 struct l_mmap_argv linux_args; 368 369 error = copyin(args->ptr, &linux_args, sizeof(linux_args)); 370 if (error) 371 return (error); 372 373 #ifdef DEBUG 374 if (ldebug(mmap)) 375 printf(ARGS(mmap, "%p, %d, %d, 0x%08x, %d, %d"), 376 (void *)linux_args.addr, linux_args.len, linux_args.prot, 377 linux_args.flags, linux_args.fd, linux_args.pgoff); 378 #endif 379 380 return (linux_mmap_common(td, linux_args.addr, linux_args.len, 381 linux_args.prot, linux_args.flags, linux_args.fd, 382 (uint32_t)linux_args.pgoff)); 383 } 384 385 int 386 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 387 { 388 389 return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot)); 390 } 391 392 int 393 linux_ioperm(struct thread *td, struct linux_ioperm_args *args) 394 { 395 int error; 396 struct i386_ioperm_args iia; 397 398 iia.start = args->start; 399 iia.length = args->length; 400 iia.enable = args->enable; 401 error = i386_set_ioperm(td, &iia); 402 return (error); 403 } 404 405 int 406 linux_iopl(struct thread *td, struct linux_iopl_args *args) 407 { 408 int error; 409 410 if (args->level < 0 || args->level > 3) 411 return (EINVAL); 412 if ((error = priv_check(td, PRIV_IO)) != 0) 413 return (error); 414 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 415 return (error); 416 td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) | 417 (args->level * (PSL_IOPL / 3)); 418 return (0); 419 } 420 421 int 422 linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap) 423 { 424 int error; 425 struct i386_ldt_args ldt; 426 struct l_descriptor ld; 427 union descriptor desc; 428 int size, written; 429 430 switch (uap->func) { 431 case 0x00: /* read_ldt */ 432 ldt.start = 0; 433 ldt.descs = uap->ptr; 434 ldt.num = uap->bytecount / sizeof(union descriptor); 435 error = i386_get_ldt(td, &ldt); 436 td->td_retval[0] *= sizeof(union descriptor); 437 break; 438 case 0x02: /* read_default_ldt = 0 */ 439 size = 5*sizeof(struct l_desc_struct); 440 if (size > uap->bytecount) 441 size = uap->bytecount; 442 for (written = error = 0; written < size && error == 0; written++) 443 error = subyte((char *)uap->ptr + written, 0); 444 td->td_retval[0] = written; 445 break; 446 case 0x01: /* write_ldt */ 447 case 0x11: /* write_ldt */ 448 if (uap->bytecount != sizeof(ld)) 449 return (EINVAL); 450 451 error = copyin(uap->ptr, &ld, sizeof(ld)); 452 if (error) 453 return (error); 454 455 ldt.start = ld.entry_number; 456 ldt.descs = &desc; 457 ldt.num = 1; 458 desc.sd.sd_lolimit = (ld.limit & 0x0000ffff); 459 desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16; 460 desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff); 461 desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24; 462 desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) | 463 (ld.contents << 2); 464 desc.sd.sd_dpl = 3; 465 desc.sd.sd_p = (ld.seg_not_present ^ 1); 466 desc.sd.sd_xx = 0; 467 desc.sd.sd_def32 = ld.seg_32bit; 468 desc.sd.sd_gran = ld.limit_in_pages; 469 error = i386_set_ldt(td, &ldt, &desc); 470 break; 471 default: 472 error = ENOSYS; 473 break; 474 } 475 476 if (error == EOPNOTSUPP) { 477 printf("linux: modify_ldt needs kernel option USER_LDT\n"); 478 error = ENOSYS; 479 } 480 481 return (error); 482 } 483 484 int 485 linux_sigaction(struct thread *td, struct linux_sigaction_args *args) 486 { 487 l_osigaction_t osa; 488 l_sigaction_t act, oact; 489 int error; 490 491 #ifdef DEBUG 492 if (ldebug(sigaction)) 493 printf(ARGS(sigaction, "%d, %p, %p"), 494 args->sig, (void *)args->nsa, (void *)args->osa); 495 #endif 496 497 if (args->nsa != NULL) { 498 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t)); 499 if (error) 500 return (error); 501 act.lsa_handler = osa.lsa_handler; 502 act.lsa_flags = osa.lsa_flags; 503 act.lsa_restorer = osa.lsa_restorer; 504 LINUX_SIGEMPTYSET(act.lsa_mask); 505 act.lsa_mask.__mask = osa.lsa_mask; 506 } 507 508 error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL, 509 args->osa ? &oact : NULL); 510 511 if (args->osa != NULL && !error) { 512 osa.lsa_handler = oact.lsa_handler; 513 osa.lsa_flags = oact.lsa_flags; 514 osa.lsa_restorer = oact.lsa_restorer; 515 osa.lsa_mask = oact.lsa_mask.__mask; 516 error = copyout(&osa, args->osa, sizeof(l_osigaction_t)); 517 } 518 519 return (error); 520 } 521 522 /* 523 * Linux has two extra args, restart and oldmask. We dont use these, 524 * but it seems that "restart" is actually a context pointer that 525 * enables the signal to happen with a different register set. 526 */ 527 int 528 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args) 529 { 530 sigset_t sigmask; 531 l_sigset_t mask; 532 533 #ifdef DEBUG 534 if (ldebug(sigsuspend)) 535 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask); 536 #endif 537 538 LINUX_SIGEMPTYSET(mask); 539 mask.__mask = args->mask; 540 linux_to_bsd_sigset(&mask, &sigmask); 541 return (kern_sigsuspend(td, sigmask)); 542 } 543 544 int 545 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) 546 { 547 l_sigset_t lmask; 548 sigset_t sigmask; 549 int error; 550 551 #ifdef DEBUG 552 if (ldebug(rt_sigsuspend)) 553 printf(ARGS(rt_sigsuspend, "%p, %d"), 554 (void *)uap->newset, uap->sigsetsize); 555 #endif 556 557 if (uap->sigsetsize != sizeof(l_sigset_t)) 558 return (EINVAL); 559 560 error = copyin(uap->newset, &lmask, sizeof(l_sigset_t)); 561 if (error) 562 return (error); 563 564 linux_to_bsd_sigset(&lmask, &sigmask); 565 return (kern_sigsuspend(td, sigmask)); 566 } 567 568 int 569 linux_pause(struct thread *td, struct linux_pause_args *args) 570 { 571 struct proc *p = td->td_proc; 572 sigset_t sigmask; 573 574 #ifdef DEBUG 575 if (ldebug(pause)) 576 printf(ARGS(pause, "")); 577 #endif 578 579 PROC_LOCK(p); 580 sigmask = td->td_sigmask; 581 PROC_UNLOCK(p); 582 return (kern_sigsuspend(td, sigmask)); 583 } 584 585 int 586 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) 587 { 588 stack_t ss, oss; 589 l_stack_t lss; 590 int error; 591 592 #ifdef DEBUG 593 if (ldebug(sigaltstack)) 594 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss); 595 #endif 596 597 if (uap->uss != NULL) { 598 error = copyin(uap->uss, &lss, sizeof(l_stack_t)); 599 if (error) 600 return (error); 601 602 ss.ss_sp = lss.ss_sp; 603 ss.ss_size = lss.ss_size; 604 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags); 605 } 606 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL, 607 (uap->uoss != NULL) ? &oss : NULL); 608 if (!error && uap->uoss != NULL) { 609 lss.ss_sp = oss.ss_sp; 610 lss.ss_size = oss.ss_size; 611 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags); 612 error = copyout(&lss, uap->uoss, sizeof(l_stack_t)); 613 } 614 615 return (error); 616 } 617 618 int 619 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args) 620 { 621 622 #ifdef DEBUG 623 if (ldebug(ftruncate64)) 624 printf(ARGS(ftruncate64, "%u, %jd"), args->fd, 625 (intmax_t)args->length); 626 #endif 627 628 return (kern_ftruncate(td, args->fd, args->length)); 629 } 630 631 int 632 linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args) 633 { 634 struct l_user_desc info; 635 int error; 636 int idx; 637 int a[2]; 638 struct segment_descriptor sd; 639 640 error = copyin(args->desc, &info, sizeof(struct l_user_desc)); 641 if (error) 642 return (error); 643 644 #ifdef DEBUG 645 if (ldebug(set_thread_area)) 646 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, %i, %i, %i\n"), 647 info.entry_number, 648 info.base_addr, 649 info.limit, 650 info.seg_32bit, 651 info.contents, 652 info.read_exec_only, 653 info.limit_in_pages, 654 info.seg_not_present, 655 info.useable); 656 #endif 657 658 idx = info.entry_number; 659 /* 660 * Semantics of Linux version: every thread in the system has array of 661 * 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This 662 * syscall loads one of the selected tls decriptors with a value and 663 * also loads GDT descriptors 6, 7 and 8 with the content of the 664 * per-thread descriptors. 665 * 666 * Semantics of FreeBSD version: I think we can ignore that Linux has 3 667 * per-thread descriptors and use just the 1st one. The tls_array[] 668 * is used only in set/get-thread_area() syscalls and for loading the 669 * GDT descriptors. In FreeBSD we use just one GDT descriptor for TLS 670 * so we will load just one. 671 * 672 * XXX: this doesn't work when a user space process tries to use more 673 * than 1 TLS segment. Comment in the Linux sources says wine might do 674 * this. 675 */ 676 677 /* 678 * we support just GLIBC TLS now 679 * we should let 3 proceed as well because we use this segment so 680 * if code does two subsequent calls it should succeed 681 */ 682 if (idx != 6 && idx != -1 && idx != 3) 683 return (EINVAL); 684 685 /* 686 * we have to copy out the GDT entry we use 687 * FreeBSD uses GDT entry #3 for storing %gs so load that 688 * 689 * XXX: what if a user space program doesn't check this value and tries 690 * to use 6, 7 or 8? 691 */ 692 idx = info.entry_number = 3; 693 error = copyout(&info, args->desc, sizeof(struct l_user_desc)); 694 if (error) 695 return (error); 696 697 if (LINUX_LDT_empty(&info)) { 698 a[0] = 0; 699 a[1] = 0; 700 } else { 701 a[0] = LINUX_LDT_entry_a(&info); 702 a[1] = LINUX_LDT_entry_b(&info); 703 } 704 705 memcpy(&sd, &a, sizeof(a)); 706 #ifdef DEBUG 707 if (ldebug(set_thread_area)) 708 printf("Segment created in set_thread_area: lobase: %x, hibase: %x, lolimit: %x, hilimit: %x, type: %i, dpl: %i, p: %i, xx: %i, def32: %i, gran: %i\n", sd.sd_lobase, 709 sd.sd_hibase, 710 sd.sd_lolimit, 711 sd.sd_hilimit, 712 sd.sd_type, 713 sd.sd_dpl, 714 sd.sd_p, 715 sd.sd_xx, 716 sd.sd_def32, 717 sd.sd_gran); 718 #endif 719 720 /* this is taken from i386 version of cpu_set_user_tls() */ 721 critical_enter(); 722 /* set %gs */ 723 td->td_pcb->pcb_gsd = sd; 724 PCPU_GET(fsgs_gdt)[1] = sd; 725 load_gs(GSEL(GUGS_SEL, SEL_UPL)); 726 critical_exit(); 727 728 return (0); 729 } 730 731 int 732 linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args) 733 { 734 735 struct l_user_desc info; 736 int error; 737 int idx; 738 struct l_desc_struct desc; 739 struct segment_descriptor sd; 740 741 #ifdef DEBUG 742 if (ldebug(get_thread_area)) 743 printf(ARGS(get_thread_area, "%p"), args->desc); 744 #endif 745 746 error = copyin(args->desc, &info, sizeof(struct l_user_desc)); 747 if (error) 748 return (error); 749 750 idx = info.entry_number; 751 /* XXX: I am not sure if we want 3 to be allowed too. */ 752 if (idx != 6 && idx != 3) 753 return (EINVAL); 754 755 idx = 3; 756 757 memset(&info, 0, sizeof(info)); 758 759 sd = PCPU_GET(fsgs_gdt)[1]; 760 761 memcpy(&desc, &sd, sizeof(desc)); 762 763 info.entry_number = idx; 764 info.base_addr = LINUX_GET_BASE(&desc); 765 info.limit = LINUX_GET_LIMIT(&desc); 766 info.seg_32bit = LINUX_GET_32BIT(&desc); 767 info.contents = LINUX_GET_CONTENTS(&desc); 768 info.read_exec_only = !LINUX_GET_WRITABLE(&desc); 769 info.limit_in_pages = LINUX_GET_LIMIT_PAGES(&desc); 770 info.seg_not_present = !LINUX_GET_PRESENT(&desc); 771 info.useable = LINUX_GET_USEABLE(&desc); 772 773 error = copyout(&info, args->desc, sizeof(struct l_user_desc)); 774 if (error) 775 return (EFAULT); 776 777 return (0); 778 } 779 780 /* XXX: this wont work with module - convert it */ 781 int 782 linux_mq_open(struct thread *td, struct linux_mq_open_args *args) 783 { 784 #ifdef P1003_1B_MQUEUE 785 return (sys_kmq_open(td, (struct kmq_open_args *)args)); 786 #else 787 return (ENOSYS); 788 #endif 789 } 790 791 int 792 linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args) 793 { 794 #ifdef P1003_1B_MQUEUE 795 return (sys_kmq_unlink(td, (struct kmq_unlink_args *)args)); 796 #else 797 return (ENOSYS); 798 #endif 799 } 800 801 int 802 linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args) 803 { 804 #ifdef P1003_1B_MQUEUE 805 return (sys_kmq_timedsend(td, (struct kmq_timedsend_args *)args)); 806 #else 807 return (ENOSYS); 808 #endif 809 } 810 811 int 812 linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args) 813 { 814 #ifdef P1003_1B_MQUEUE 815 return (sys_kmq_timedreceive(td, (struct kmq_timedreceive_args *)args)); 816 #else 817 return (ENOSYS); 818 #endif 819 } 820 821 int 822 linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args) 823 { 824 #ifdef P1003_1B_MQUEUE 825 return (sys_kmq_notify(td, (struct kmq_notify_args *)args)); 826 #else 827 return (ENOSYS); 828 #endif 829 } 830 831 int 832 linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args) 833 { 834 #ifdef P1003_1B_MQUEUE 835 return (sys_kmq_setattr(td, (struct kmq_setattr_args *)args)); 836 #else 837 return (ENOSYS); 838 #endif 839 }
Cache object: 03ed6175317890d191173ec95149fac9
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]