sys/i386/linux/linux_machdep.c

   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/systm.h>
  34 #include <sys/capsicum.h>
  35 #include <sys/file.h>
  36 #include <sys/fcntl.h>
  37 #include <sys/imgact.h>
  38 #include <sys/lock.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mman.h>
  41 #include <sys/mutex.h>
  42 #include <sys/sx.h>
  43 #include <sys/priv.h>
  44 #include <sys/proc.h>
  45 #include <sys/queue.h>
  46 #include <sys/resource.h>
  47 #include <sys/resourcevar.h>
  48 #include <sys/signalvar.h>
  49 #include <sys/syscallsubr.h>
  50 #include <sys/sysproto.h>
  51 #include <sys/unistd.h>
  52 #include <sys/wait.h>
  53 #include <sys/sched.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/vm.h>
  61 #include <vm/pmap.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_ipc.h>
  67 #include <compat/linux/linux_misc.h>
  68 #include <compat/linux/linux_mmap.h>
  69 #include <compat/linux/linux_signal.h>
  70 #include <compat/linux/linux_util.h>
  71 #include <compat/linux/linux_emul.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 = 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(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 = 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 == NULL)
 180                                 return (EINVAL);
 181                         error = copyin(args->ptr, &tmp, sizeof(tmp));
 182                         if (error)
 183                                 return (error);
 184                         a.msgp = tmp.msgp;
 185                         a.msgtyp = tmp.msgtyp;
 186                 } else {
 187                         a.msgp = 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 = args->ptr;
 205                 return (linux_msgctl(td, &a));
 206         }
 207         case LINUX_SHMAT: {
 208                 struct linux_shmat_args a;
 209
 210                 a.shmid = args->arg1;
 211                 a.shmaddr = args->ptr;
 212                 a.shmflg = args->arg2;
 213                 a.raddr = (l_ulong *)args->arg3;
 214                 return (linux_shmat(td, &a));
 215         }
 216         case LINUX_SHMDT: {
 217                 struct linux_shmdt_args a;
 218
 219                 a.shmaddr = args->ptr;
 220                 return (linux_shmdt(td, &a));
 221         }
 222         case LINUX_SHMGET: {
 223                 struct linux_shmget_args a;
 224
 225                 a.key = args->arg1;
 226                 a.size = args->arg2;
 227                 a.shmflg = args->arg3;
 228                 return (linux_shmget(td, &a));
 229         }
 230         case LINUX_SHMCTL: {
 231                 struct linux_shmctl_args a;
 232
 233                 a.shmid = args->arg1;
 234                 a.cmd = args->arg2;
 235                 a.buf = args->ptr;
 236                 return (linux_shmctl(td, &a));
 237         }
 238         default:
 239                 break;
 240         }
 241
 242         return (EINVAL);
 243 }
 244
 245 int
 246 linux_old_select(struct thread *td, struct linux_old_select_args *args)
 247 {
 248         struct l_old_select_argv linux_args;
 249         struct linux_select_args newsel;
 250         int error;
 251
 252 #ifdef DEBUG
 253         if (ldebug(old_select))
 254                 printf(ARGS(old_select, "%p"), args->ptr);
 255 #endif
 256
 257         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
 258         if (error)
 259                 return (error);
 260
 261         newsel.nfds = linux_args.nfds;
 262         newsel.readfds = linux_args.readfds;
 263         newsel.writefds = linux_args.writefds;
 264         newsel.exceptfds = linux_args.exceptfds;
 265         newsel.timeout = linux_args.timeout;
 266         return (linux_select(td, &newsel));
 267 }
 268
 269 int
 270 linux_set_cloned_tls(struct thread *td, void *desc)
 271 {
 272         struct segment_descriptor sd;
 273         struct l_user_desc info;
 274         int idx, error;
 275         int a[2];
 276
 277         error = copyin(desc, &info, sizeof(struct l_user_desc));
 278         if (error) {
 279                 printf(LMSG("copyin failed!"));
 280         } else {
 281                 idx = info.entry_number;
 282
 283                 /*
 284                  * looks like we're getting the idx we returned
 285                  * in the set_thread_area() syscall
 286                  */
 287                 if (idx != 6 && idx != 3) {
 288                         printf(LMSG("resetting idx!"));
 289                         idx = 3;
 290                 }
 291
 292                 /* this doesnt happen in practice */
 293                 if (idx == 6) {
 294                         /* we might copy out the entry_number as 3 */
 295                         info.entry_number = 3;
 296                         error = copyout(&info, desc, sizeof(struct l_user_desc));
 297                         if (error)
 298                                 printf(LMSG("copyout failed!"));
 299                 }
 300
 301                 a[0] = LINUX_LDT_entry_a(&info);
 302                 a[1] = LINUX_LDT_entry_b(&info);
 303
 304                 memcpy(&sd, &a, sizeof(a));
 305 #ifdef DEBUG
 306                 if (ldebug(clone))
 307                         printf("Segment created in clone with "
 308                         "CLONE_SETTLS: lobase: %x, hibase: %x, "
 309                         "lolimit: %x, hilimit: %x, type: %i, "
 310                         "dpl: %i, p: %i, xx: %i, def32: %i, "
 311                         "gran: %i\n", sd.sd_lobase, sd.sd_hibase,
 312                         sd.sd_lolimit, sd.sd_hilimit, sd.sd_type,
 313                         sd.sd_dpl, sd.sd_p, sd.sd_xx,
 314                         sd.sd_def32, sd.sd_gran);
 315 #endif
 316
 317                 /* set %gs */
 318                 td->td_pcb->pcb_gsd = sd;
 319                 td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
 320         }
 321
 322         return (error);
 323 }
 324
 325 int
 326 linux_set_upcall_kse(struct thread *td, register_t stack)
 327 {
 328
 329         if (stack)
 330                 td->td_frame->tf_esp = stack;
 331
 332         /*
 333          * The newly created Linux thread returns
 334          * to the user space by the same path that a parent do.
 335          */
 336         td->td_frame->tf_eax = 0;
 337         return (0);
 338 }
 339
 340 int
 341 linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
 342 {
 343
 344 #ifdef DEBUG
 345         if (ldebug(mmap2))
 346                 printf(ARGS(mmap2, "%p, %d, %d, 0x%08x, %d, %d"),
 347                     (void *)args->addr, args->len, args->prot,
 348                     args->flags, args->fd, args->pgoff);
 349 #endif
 350
 351         return (linux_mmap_common(td, args->addr, args->len, args->prot,
 352                 args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
 353                 PAGE_SIZE));
 354 }
 355
 356 int
 357 linux_mmap(struct thread *td, struct linux_mmap_args *args)
 358 {
 359         int error;
 360         struct l_mmap_argv linux_args;
 361
 362         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
 363         if (error)
 364                 return (error);
 365
 366 #ifdef DEBUG
 367         if (ldebug(mmap))
 368                 printf(ARGS(mmap, "%p, %d, %d, 0x%08x, %d, %d"),
 369                     (void *)linux_args.addr, linux_args.len, linux_args.prot,
 370                     linux_args.flags, linux_args.fd, linux_args.pgoff);
 371 #endif
 372
 373         return (linux_mmap_common(td, linux_args.addr, linux_args.len,
 374             linux_args.prot, linux_args.flags, linux_args.fd,
 375             (uint32_t)linux_args.pgoff));
 376 }
 377
 378 int
 379 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
 380 {
 381
 382         return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot));
 383 }
 384
 385 int
 386 linux_ioperm(struct thread *td, struct linux_ioperm_args *args)
 387 {
 388         int error;
 389         struct i386_ioperm_args iia;
 390
 391         iia.start = args->start;
 392         iia.length = args->length;
 393         iia.enable = args->enable;
 394         error = i386_set_ioperm(td, &iia);
 395         return (error);
 396 }
 397
 398 int
 399 linux_iopl(struct thread *td, struct linux_iopl_args *args)
 400 {
 401         int error;
 402
 403         if (args->level < 0 || args->level > 3)
 404                 return (EINVAL);
 405         if ((error = priv_check(td, PRIV_IO)) != 0)
 406                 return (error);
 407         if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
 408                 return (error);
 409         td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) |
 410             (args->level * (PSL_IOPL / 3));
 411         return (0);
 412 }
 413
 414 int
 415 linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap)
 416 {
 417         int error;
 418         struct i386_ldt_args ldt;
 419         struct l_descriptor ld;
 420         union descriptor desc;
 421         int size, written;
 422
 423         switch (uap->func) {
 424         case 0x00: /* read_ldt */
 425                 ldt.start = 0;
 426                 ldt.descs = uap->ptr;
 427                 ldt.num = uap->bytecount / sizeof(union descriptor);
 428                 error = i386_get_ldt(td, &ldt);
 429                 td->td_retval[0] *= sizeof(union descriptor);
 430                 break;
 431         case 0x02: /* read_default_ldt = 0 */
 432                 size = 5*sizeof(struct l_desc_struct);
 433                 if (size > uap->bytecount)
 434                         size = uap->bytecount;
 435                 for (written = error = 0; written < size && error == 0; written++)
 436                         error = subyte((char *)uap->ptr + written, 0);
 437                 td->td_retval[0] = written;
 438                 break;
 439         case 0x01: /* write_ldt */
 440         case 0x11: /* write_ldt */
 441                 if (uap->bytecount != sizeof(ld))
 442                         return (EINVAL);
 443
 444                 error = copyin(uap->ptr, &ld, sizeof(ld));
 445                 if (error)
 446                         return (error);
 447
 448                 ldt.start = ld.entry_number;
 449                 ldt.descs = &desc;
 450                 ldt.num = 1;
 451                 desc.sd.sd_lolimit = (ld.limit & 0x0000ffff);
 452                 desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16;
 453                 desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff);
 454                 desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24;
 455                 desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) |
 456                         (ld.contents << 2);
 457                 desc.sd.sd_dpl = 3;
 458                 desc.sd.sd_p = (ld.seg_not_present ^ 1);
 459                 desc.sd.sd_xx = 0;
 460                 desc.sd.sd_def32 = ld.seg_32bit;
 461                 desc.sd.sd_gran = ld.limit_in_pages;
 462                 error = i386_set_ldt(td, &ldt, &desc);
 463                 break;
 464         default:
 465                 error = ENOSYS;
 466                 break;
 467         }
 468
 469         if (error == EOPNOTSUPP) {
 470                 printf("linux: modify_ldt needs kernel option USER_LDT\n");
 471                 error = ENOSYS;
 472         }
 473
 474         return (error);
 475 }
 476
 477 int
 478 linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
 479 {
 480         l_osigaction_t osa;
 481         l_sigaction_t act, oact;
 482         int error;
 483
 484 #ifdef DEBUG
 485         if (ldebug(sigaction))
 486                 printf(ARGS(sigaction, "%d, %p, %p"),
 487                     args->sig, (void *)args->nsa, (void *)args->osa);
 488 #endif
 489
 490         if (args->nsa != NULL) {
 491                 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
 492                 if (error)
 493                         return (error);
 494                 act.lsa_handler = osa.lsa_handler;
 495                 act.lsa_flags = osa.lsa_flags;
 496                 act.lsa_restorer = osa.lsa_restorer;
 497                 LINUX_SIGEMPTYSET(act.lsa_mask);
 498                 act.lsa_mask.__mask = osa.lsa_mask;
 499         }
 500
 501         error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
 502             args->osa ? &oact : NULL);
 503
 504         if (args->osa != NULL && !error) {
 505                 osa.lsa_handler = oact.lsa_handler;
 506                 osa.lsa_flags = oact.lsa_flags;
 507                 osa.lsa_restorer = oact.lsa_restorer;
 508                 osa.lsa_mask = oact.lsa_mask.__mask;
 509                 error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
 510         }
 511
 512         return (error);
 513 }
 514
 515 /*
 516  * Linux has two extra args, restart and oldmask.  We dont use these,
 517  * but it seems that "restart" is actually a context pointer that
 518  * enables the signal to happen with a different register set.
 519  */
 520 int
 521 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
 522 {
 523         sigset_t sigmask;
 524         l_sigset_t mask;
 525
 526 #ifdef DEBUG
 527         if (ldebug(sigsuspend))
 528                 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask);
 529 #endif
 530
 531         LINUX_SIGEMPTYSET(mask);
 532         mask.__mask = args->mask;
 533         linux_to_bsd_sigset(&mask, &sigmask);
 534         return (kern_sigsuspend(td, sigmask));
 535 }
 536
 537 int
 538 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
 539 {
 540         l_sigset_t lmask;
 541         sigset_t sigmask;
 542         int error;
 543
 544 #ifdef DEBUG
 545         if (ldebug(rt_sigsuspend))
 546                 printf(ARGS(rt_sigsuspend, "%p, %d"),
 547                     (void *)uap->newset, uap->sigsetsize);
 548 #endif
 549
 550         if (uap->sigsetsize != sizeof(l_sigset_t))
 551                 return (EINVAL);
 552
 553         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
 554         if (error)
 555                 return (error);
 556
 557         linux_to_bsd_sigset(&lmask, &sigmask);
 558         return (kern_sigsuspend(td, sigmask));
 559 }
 560
 561 int
 562 linux_pause(struct thread *td, struct linux_pause_args *args)
 563 {
 564         struct proc *p = td->td_proc;
 565         sigset_t sigmask;
 566
 567 #ifdef DEBUG
 568         if (ldebug(pause))
 569                 printf(ARGS(pause, ""));
 570 #endif
 571
 572         PROC_LOCK(p);
 573         sigmask = td->td_sigmask;
 574         PROC_UNLOCK(p);
 575         return (kern_sigsuspend(td, sigmask));
 576 }
 577
 578 int
 579 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
 580 {
 581         stack_t ss, oss;
 582         l_stack_t lss;
 583         int error;
 584
 585 #ifdef DEBUG
 586         if (ldebug(sigaltstack))
 587                 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss);
 588 #endif
 589
 590         if (uap->uss != NULL) {
 591                 error = copyin(uap->uss, &lss, sizeof(l_stack_t));
 592                 if (error)
 593                         return (error);
 594
 595                 ss.ss_sp = lss.ss_sp;
 596                 ss.ss_size = lss.ss_size;
 597                 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
 598         }
 599         error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
 600             (uap->uoss != NULL) ? &oss : NULL);
 601         if (!error && uap->uoss != NULL) {
 602                 lss.ss_sp = oss.ss_sp;
 603                 lss.ss_size = oss.ss_size;
 604                 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
 605                 error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
 606         }
 607
 608         return (error);
 609 }
 610
 611 int
 612 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
 613 {
 614         struct ftruncate_args sa;
 615
 616 #ifdef DEBUG
 617         if (ldebug(ftruncate64))
 618                 printf(ARGS(ftruncate64, "%u, %jd"), args->fd,
 619                     (intmax_t)args->length);
 620 #endif
 621
 622         sa.fd = args->fd;
 623         sa.length = args->length;
 624         return sys_ftruncate(td, &sa);
 625 }
 626
 627 int
 628 linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args)
 629 {
 630         struct l_user_desc info;
 631         int error;
 632         int idx;
 633         int a[2];
 634         struct segment_descriptor sd;
 635
 636         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
 637         if (error)
 638                 return (error);
 639
 640 #ifdef DEBUG
 641         if (ldebug(set_thread_area))
 642                 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, %i, %i, %i\n"),
 643                       info.entry_number,
 644                       info.base_addr,
 645                       info.limit,
 646                       info.seg_32bit,
 647                       info.contents,
 648                       info.read_exec_only,
 649                       info.limit_in_pages,
 650                       info.seg_not_present,
 651                       info.useable);
 652 #endif
 653
 654         idx = info.entry_number;
 655         /*
 656          * Semantics of linux version: every thread in the system has array of
 657          * 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This
 658          * syscall loads one of the selected tls decriptors with a value and
 659          * also loads GDT descriptors 6, 7 and 8 with the content of the
 660          * per-thread descriptors.
 661          *
 662          * Semantics of fbsd version: I think we can ignore that linux has 3
 663          * per-thread descriptors and use just the 1st one. The tls_array[]
 664          * is used only in set/get-thread_area() syscalls and for loading the
 665          * GDT descriptors. In fbsd we use just one GDT descriptor for TLS so
 666          * we will load just one.
 667          *
 668          * XXX: this doesn't work when a user space process tries to use more
 669          * than 1 TLS segment. Comment in the linux sources says wine might do
 670          * this.
 671          */
 672
 673         /*
 674          * we support just GLIBC TLS now
 675          * we should let 3 proceed as well because we use this segment so
 676          * if code does two subsequent calls it should succeed
 677          */
 678         if (idx != 6 && idx != -1 && idx != 3)
 679                 return (EINVAL);
 680
 681         /*
 682          * we have to copy out the GDT entry we use
 683          * FreeBSD uses GDT entry #3 for storing %gs so load that
 684          *
 685          * XXX: what if a user space program doesn't check this value and tries
 686          * to use 6, 7 or 8?
 687          */
 688         idx = info.entry_number = 3;
 689         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
 690         if (error)
 691                 return (error);
 692
 693         if (LINUX_LDT_empty(&info)) {
 694                 a[0] = 0;
 695                 a[1] = 0;
 696         } else {
 697                 a[0] = LINUX_LDT_entry_a(&info);
 698                 a[1] = LINUX_LDT_entry_b(&info);
 699         }
 700
 701         memcpy(&sd, &a, sizeof(a));
 702 #ifdef DEBUG
 703         if (ldebug(set_thread_area))
 704                 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,
 705                         sd.sd_hibase,
 706                         sd.sd_lolimit,
 707                         sd.sd_hilimit,
 708                         sd.sd_type,
 709                         sd.sd_dpl,
 710                         sd.sd_p,
 711                         sd.sd_xx,
 712                         sd.sd_def32,
 713                         sd.sd_gran);
 714 #endif
 715
 716         /* this is taken from i386 version of cpu_set_user_tls() */
 717         critical_enter();
 718         /* set %gs */
 719         td->td_pcb->pcb_gsd = sd;
 720         PCPU_GET(fsgs_gdt)[1] = sd;
 721         load_gs(GSEL(GUGS_SEL, SEL_UPL));
 722         critical_exit();
 723
 724         return (0);
 725 }
 726
 727 int
 728 linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args)
 729 {
 730
 731         struct l_user_desc info;
 732         int error;
 733         int idx;
 734         struct l_desc_struct desc;
 735         struct segment_descriptor sd;
 736
 737 #ifdef DEBUG
 738         if (ldebug(get_thread_area))
 739                 printf(ARGS(get_thread_area, "%p"), args->desc);
 740 #endif
 741
 742         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
 743         if (error)
 744                 return (error);
 745
 746         idx = info.entry_number;
 747         /* XXX: I am not sure if we want 3 to be allowed too. */
 748         if (idx != 6 && idx != 3)
 749                 return (EINVAL);
 750
 751         idx = 3;
 752
 753         memset(&info, 0, sizeof(info));
 754
 755         sd = PCPU_GET(fsgs_gdt)[1];
 756
 757         memcpy(&desc, &sd, sizeof(desc));
 758
 759         info.entry_number = idx;
 760         info.base_addr = LINUX_GET_BASE(&desc);
 761         info.limit = LINUX_GET_LIMIT(&desc);
 762         info.seg_32bit = LINUX_GET_32BIT(&desc);
 763         info.contents = LINUX_GET_CONTENTS(&desc);
 764         info.read_exec_only = !LINUX_GET_WRITABLE(&desc);
 765         info.limit_in_pages = LINUX_GET_LIMIT_PAGES(&desc);
 766         info.seg_not_present = !LINUX_GET_PRESENT(&desc);
 767         info.useable = LINUX_GET_USEABLE(&desc);
 768
 769         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
 770         if (error)
 771                 return (EFAULT);
 772
 773         return (0);
 774 }
 775
 776 /* XXX: this wont work with module - convert it */
 777 int
 778 linux_mq_open(struct thread *td, struct linux_mq_open_args *args)
 779 {
 780 #ifdef P1003_1B_MQUEUE
 781         return sys_kmq_open(td, (struct kmq_open_args *) args);
 782 #else
 783         return (ENOSYS);
 784 #endif
 785 }
 786
 787 int
 788 linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args)
 789 {
 790 #ifdef P1003_1B_MQUEUE
 791         return sys_kmq_unlink(td, (struct kmq_unlink_args *) args);
 792 #else
 793         return (ENOSYS);
 794 #endif
 795 }
 796
 797 int
 798 linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args)
 799 {
 800 #ifdef P1003_1B_MQUEUE
 801         return sys_kmq_timedsend(td, (struct kmq_timedsend_args *) args);
 802 #else
 803         return (ENOSYS);
 804 #endif
 805 }
 806
 807 int
 808 linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args)
 809 {
 810 #ifdef P1003_1B_MQUEUE
 811         return sys_kmq_timedreceive(td, (struct kmq_timedreceive_args *) args);
 812 #else
 813         return (ENOSYS);
 814 #endif
 815 }
 816
 817 int
 818 linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args)
 819 {
 820 #ifdef P1003_1B_MQUEUE
 821         return sys_kmq_notify(td, (struct kmq_notify_args *) args);
 822 #else
 823         return (ENOSYS);
 824 #endif
 825 }
 826
 827 int
 828 linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args)
 829 {
 830 #ifdef P1003_1B_MQUEUE
 831         return sys_kmq_setattr(td, (struct kmq_setattr_args *) args);
 832 #else
 833         return (ENOSYS);
 834 #endif
 835 }