The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_machdep.c

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    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: stable/9/sys/i386/linux/linux_machdep.c 272029 2014-09-23 16:03:57Z bz $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/capability.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_signal.h>
   69 #include <compat/linux/linux_util.h>
   70 #include <compat/linux/linux_emul.h>
   71 
   72 #include <i386/include/pcb.h>                   /* needed for pcb definition in linux_set_thread_area */
   73 
   74 #include "opt_posix.h"
   75 
   76 extern struct sysentvec elf32_freebsd_sysvec;   /* defined in i386/i386/elf_machdep.c */
   77 
   78 struct l_descriptor {
   79         l_uint          entry_number;
   80         l_ulong         base_addr;
   81         l_uint          limit;
   82         l_uint          seg_32bit:1;
   83         l_uint          contents:2;
   84         l_uint          read_exec_only:1;
   85         l_uint          limit_in_pages:1;
   86         l_uint          seg_not_present:1;
   87         l_uint          useable:1;
   88 };
   89 
   90 struct l_old_select_argv {
   91         l_int           nfds;
   92         l_fd_set        *readfds;
   93         l_fd_set        *writefds;
   94         l_fd_set        *exceptfds;
   95         struct l_timeval        *timeout;
   96 };
   97 
   98 static int      linux_mmap_common(struct thread *td, l_uintptr_t addr,
   99                     l_size_t len, l_int prot, l_int flags, l_int fd,
  100                     l_loff_t pos);
  101 
  102 int
  103 linux_to_bsd_sigaltstack(int lsa)
  104 {
  105         int bsa = 0;
  106 
  107         if (lsa & LINUX_SS_DISABLE)
  108                 bsa |= SS_DISABLE;
  109         if (lsa & LINUX_SS_ONSTACK)
  110                 bsa |= SS_ONSTACK;
  111         return (bsa);
  112 }
  113 
  114 int
  115 bsd_to_linux_sigaltstack(int bsa)
  116 {
  117         int lsa = 0;
  118 
  119         if (bsa & SS_DISABLE)
  120                 lsa |= LINUX_SS_DISABLE;
  121         if (bsa & SS_ONSTACK)
  122                 lsa |= LINUX_SS_ONSTACK;
  123         return (lsa);
  124 }
  125 
  126 int
  127 linux_execve(struct thread *td, struct linux_execve_args *args)
  128 {
  129         int error;
  130         char *newpath;
  131         struct image_args eargs;
  132 
  133         LCONVPATHEXIST(td, args->path, &newpath);
  134 
  135 #ifdef DEBUG
  136         if (ldebug(execve))
  137                 printf(ARGS(execve, "%s"), newpath);
  138 #endif
  139 
  140         error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE,
  141             args->argp, args->envp);
  142         free(newpath, M_TEMP);
  143         if (error == 0)
  144                 error = kern_execve(td, &eargs, NULL);
  145         if (error == 0)
  146                 /* linux process can exec fbsd one, dont attempt
  147                  * to create emuldata for such process using
  148                  * linux_proc_init, this leads to a panic on KASSERT
  149                  * because such process has p->p_emuldata == NULL
  150                  */
  151                 if (SV_PROC_ABI(td->td_proc) == SV_ABI_LINUX)
  152                         error = linux_proc_init(td, 0, 0);
  153         return (error);
  154 }
  155 
  156 struct l_ipc_kludge {
  157         struct l_msgbuf *msgp;
  158         l_long msgtyp;
  159 };
  160 
  161 int
  162 linux_ipc(struct thread *td, struct linux_ipc_args *args)
  163 {
  164 
  165         switch (args->what & 0xFFFF) {
  166         case LINUX_SEMOP: {
  167                 struct linux_semop_args a;
  168 
  169                 a.semid = args->arg1;
  170                 a.tsops = args->ptr;
  171                 a.nsops = args->arg2;
  172                 return (linux_semop(td, &a));
  173         }
  174         case LINUX_SEMGET: {
  175                 struct linux_semget_args a;
  176 
  177                 a.key = args->arg1;
  178                 a.nsems = args->arg2;
  179                 a.semflg = args->arg3;
  180                 return (linux_semget(td, &a));
  181         }
  182         case LINUX_SEMCTL: {
  183                 struct linux_semctl_args a;
  184                 int error;
  185 
  186                 a.semid = args->arg1;
  187                 a.semnum = args->arg2;
  188                 a.cmd = args->arg3;
  189                 error = copyin(args->ptr, &a.arg, sizeof(a.arg));
  190                 if (error)
  191                         return (error);
  192                 return (linux_semctl(td, &a));
  193         }
  194         case LINUX_MSGSND: {
  195                 struct linux_msgsnd_args a;
  196 
  197                 a.msqid = args->arg1;
  198                 a.msgp = args->ptr;
  199                 a.msgsz = args->arg2;
  200                 a.msgflg = args->arg3;
  201                 return (linux_msgsnd(td, &a));
  202         }
  203         case LINUX_MSGRCV: {
  204                 struct linux_msgrcv_args a;
  205 
  206                 a.msqid = args->arg1;
  207                 a.msgsz = args->arg2;
  208                 a.msgflg = args->arg3;
  209                 if ((args->what >> 16) == 0) {
  210                         struct l_ipc_kludge tmp;
  211                         int error;
  212 
  213                         if (args->ptr == NULL)
  214                                 return (EINVAL);
  215                         error = copyin(args->ptr, &tmp, sizeof(tmp));
  216                         if (error)
  217                                 return (error);
  218                         a.msgp = tmp.msgp;
  219                         a.msgtyp = tmp.msgtyp;
  220                 } else {
  221                         a.msgp = args->ptr;
  222                         a.msgtyp = args->arg5;
  223                 }
  224                 return (linux_msgrcv(td, &a));
  225         }
  226         case LINUX_MSGGET: {
  227                 struct linux_msgget_args a;
  228 
  229                 a.key = args->arg1;
  230                 a.msgflg = args->arg2;
  231                 return (linux_msgget(td, &a));
  232         }
  233         case LINUX_MSGCTL: {
  234                 struct linux_msgctl_args a;
  235 
  236                 a.msqid = args->arg1;
  237                 a.cmd = args->arg2;
  238                 a.buf = args->ptr;
  239                 return (linux_msgctl(td, &a));
  240         }
  241         case LINUX_SHMAT: {
  242                 struct linux_shmat_args a;
  243 
  244                 a.shmid = args->arg1;
  245                 a.shmaddr = args->ptr;
  246                 a.shmflg = args->arg2;
  247                 a.raddr = (l_ulong *)args->arg3;
  248                 return (linux_shmat(td, &a));
  249         }
  250         case LINUX_SHMDT: {
  251                 struct linux_shmdt_args a;
  252 
  253                 a.shmaddr = args->ptr;
  254                 return (linux_shmdt(td, &a));
  255         }
  256         case LINUX_SHMGET: {
  257                 struct linux_shmget_args a;
  258 
  259                 a.key = args->arg1;
  260                 a.size = args->arg2;
  261                 a.shmflg = args->arg3;
  262                 return (linux_shmget(td, &a));
  263         }
  264         case LINUX_SHMCTL: {
  265                 struct linux_shmctl_args a;
  266 
  267                 a.shmid = args->arg1;
  268                 a.cmd = args->arg2;
  269                 a.buf = args->ptr;
  270                 return (linux_shmctl(td, &a));
  271         }
  272         default:
  273                 break;
  274         }
  275 
  276         return (EINVAL);
  277 }
  278 
  279 int
  280 linux_old_select(struct thread *td, struct linux_old_select_args *args)
  281 {
  282         struct l_old_select_argv linux_args;
  283         struct linux_select_args newsel;
  284         int error;
  285 
  286 #ifdef DEBUG
  287         if (ldebug(old_select))
  288                 printf(ARGS(old_select, "%p"), args->ptr);
  289 #endif
  290 
  291         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  292         if (error)
  293                 return (error);
  294 
  295         newsel.nfds = linux_args.nfds;
  296         newsel.readfds = linux_args.readfds;
  297         newsel.writefds = linux_args.writefds;
  298         newsel.exceptfds = linux_args.exceptfds;
  299         newsel.timeout = linux_args.timeout;
  300         return (linux_select(td, &newsel));
  301 }
  302 
  303 int
  304 linux_set_cloned_tls(struct thread *td, void *desc)
  305 {
  306         struct segment_descriptor sd;
  307         struct l_user_desc info;
  308         int idx, error;
  309         int a[2];
  310 
  311         error = copyin(desc, &info, sizeof(struct l_user_desc));
  312         if (error) {
  313                 printf(LMSG("copyin failed!"));
  314         } else {
  315                 idx = info.entry_number;
  316 
  317                 /* 
  318                  * looks like we're getting the idx we returned
  319                  * in the set_thread_area() syscall
  320                  */
  321                 if (idx != 6 && idx != 3) {
  322                         printf(LMSG("resetting idx!"));
  323                         idx = 3;
  324                 }
  325 
  326                 /* this doesnt happen in practice */
  327                 if (idx == 6) {
  328                         /* we might copy out the entry_number as 3 */
  329                         info.entry_number = 3;
  330                         error = copyout(&info, desc, sizeof(struct l_user_desc));
  331                         if (error)
  332                                 printf(LMSG("copyout failed!"));
  333                 }
  334 
  335                 a[0] = LINUX_LDT_entry_a(&info);
  336                 a[1] = LINUX_LDT_entry_b(&info);
  337 
  338                 memcpy(&sd, &a, sizeof(a));
  339 #ifdef DEBUG
  340                 if (ldebug(clone))
  341                         printf("Segment created in clone with "
  342                         "CLONE_SETTLS: lobase: %x, hibase: %x, "
  343                         "lolimit: %x, hilimit: %x, type: %i, "
  344                         "dpl: %i, p: %i, xx: %i, def32: %i, "
  345                         "gran: %i\n", sd.sd_lobase, sd.sd_hibase,
  346                         sd.sd_lolimit, sd.sd_hilimit, sd.sd_type,
  347                         sd.sd_dpl, sd.sd_p, sd.sd_xx,
  348                         sd.sd_def32, sd.sd_gran);
  349 #endif
  350 
  351                 /* set %gs */
  352                 td->td_pcb->pcb_gsd = sd;
  353                 td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
  354         }
  355 
  356         return (error);
  357 }
  358 
  359 int
  360 linux_set_upcall_kse(struct thread *td, register_t stack)
  361 {
  362 
  363         td->td_frame->tf_esp = stack;
  364 
  365         return (0);
  366 }
  367 
  368 #define STACK_SIZE  (2 * 1024 * 1024)
  369 #define GUARD_SIZE  (4 * PAGE_SIZE)
  370 
  371 int
  372 linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
  373 {
  374 
  375 #ifdef DEBUG
  376         if (ldebug(mmap2))
  377                 printf(ARGS(mmap2, "%p, %d, %d, 0x%08x, %d, %d"),
  378                     (void *)args->addr, args->len, args->prot,
  379                     args->flags, args->fd, args->pgoff);
  380 #endif
  381 
  382         return (linux_mmap_common(td, args->addr, args->len, args->prot,
  383                 args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
  384                 PAGE_SIZE));
  385 }
  386 
  387 int
  388 linux_mmap(struct thread *td, struct linux_mmap_args *args)
  389 {
  390         int error;
  391         struct l_mmap_argv linux_args;
  392 
  393         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  394         if (error)
  395                 return (error);
  396 
  397 #ifdef DEBUG
  398         if (ldebug(mmap))
  399                 printf(ARGS(mmap, "%p, %d, %d, 0x%08x, %d, %d"),
  400                     (void *)linux_args.addr, linux_args.len, linux_args.prot,
  401                     linux_args.flags, linux_args.fd, linux_args.pgoff);
  402 #endif
  403 
  404         return (linux_mmap_common(td, linux_args.addr, linux_args.len,
  405             linux_args.prot, linux_args.flags, linux_args.fd,
  406             (uint32_t)linux_args.pgoff));
  407 }
  408 
  409 static int
  410 linux_mmap_common(struct thread *td, l_uintptr_t addr, l_size_t len, l_int prot,
  411     l_int flags, l_int fd, l_loff_t pos)
  412 {
  413         struct proc *p = td->td_proc;
  414         struct mmap_args /* {
  415                 caddr_t addr;
  416                 size_t len;
  417                 int prot;
  418                 int flags;
  419                 int fd;
  420                 long pad;
  421                 off_t pos;
  422         } */ bsd_args;
  423         int error;
  424         struct file *fp;
  425 
  426         error = 0;
  427         bsd_args.flags = 0;
  428         fp = NULL;
  429 
  430         /*
  431          * Linux mmap(2):
  432          * You must specify exactly one of MAP_SHARED and MAP_PRIVATE
  433          */
  434         if (!((flags & LINUX_MAP_SHARED) ^ (flags & LINUX_MAP_PRIVATE)))
  435                 return (EINVAL);
  436 
  437         if (flags & LINUX_MAP_SHARED)
  438                 bsd_args.flags |= MAP_SHARED;
  439         if (flags & LINUX_MAP_PRIVATE)
  440                 bsd_args.flags |= MAP_PRIVATE;
  441         if (flags & LINUX_MAP_FIXED)
  442                 bsd_args.flags |= MAP_FIXED;
  443         if (flags & LINUX_MAP_ANON) {
  444                 /* Enforce pos to be on page boundary, then ignore. */
  445                 if ((pos & PAGE_MASK) != 0)
  446                         return (EINVAL);
  447                 pos = 0;
  448                 bsd_args.flags |= MAP_ANON;
  449         } else
  450                 bsd_args.flags |= MAP_NOSYNC;
  451         if (flags & LINUX_MAP_GROWSDOWN)
  452                 bsd_args.flags |= MAP_STACK;
  453 
  454         /*
  455          * PROT_READ, PROT_WRITE, or PROT_EXEC implies PROT_READ and PROT_EXEC
  456          * on Linux/i386. We do this to ensure maximum compatibility.
  457          * Linux/ia64 does the same in i386 emulation mode.
  458          */
  459         bsd_args.prot = prot;
  460         if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
  461                 bsd_args.prot |= PROT_READ | PROT_EXEC;
  462 
  463         /* Linux does not check file descriptor when MAP_ANONYMOUS is set. */
  464         bsd_args.fd = (bsd_args.flags & MAP_ANON) ? -1 : fd;
  465         if (bsd_args.fd != -1) {
  466                 /*
  467                  * Linux follows Solaris mmap(2) description:
  468                  * The file descriptor fildes is opened with
  469                  * read permission, regardless of the
  470                  * protection options specified.
  471                  *
  472                  * Checking just CAP_MMAP is fine here, since the real work
  473                  * is done in the FreeBSD mmap().
  474                  */
  475 
  476                 if ((error = fget(td, bsd_args.fd, CAP_MMAP, &fp)) != 0)
  477                         return (error);
  478                 if (fp->f_type != DTYPE_VNODE) {
  479                         fdrop(fp, td);
  480                         return (EINVAL);
  481                 }
  482 
  483                 /* Linux mmap() just fails for O_WRONLY files */
  484                 if (!(fp->f_flag & FREAD)) {
  485                         fdrop(fp, td);
  486                         return (EACCES);
  487                 }
  488 
  489                 fdrop(fp, td);
  490         }
  491 
  492         if (flags & LINUX_MAP_GROWSDOWN) {
  493                 /* 
  494                  * The Linux MAP_GROWSDOWN option does not limit auto
  495                  * growth of the region.  Linux mmap with this option
  496                  * takes as addr the inital BOS, and as len, the initial
  497                  * region size.  It can then grow down from addr without
  498                  * limit.  However, linux threads has an implicit internal
  499                  * limit to stack size of STACK_SIZE.  Its just not
  500                  * enforced explicitly in linux.  But, here we impose
  501                  * a limit of (STACK_SIZE - GUARD_SIZE) on the stack
  502                  * region, since we can do this with our mmap.
  503                  *
  504                  * Our mmap with MAP_STACK takes addr as the maximum
  505                  * downsize limit on BOS, and as len the max size of
  506                  * the region.  It them maps the top SGROWSIZ bytes,
  507                  * and auto grows the region down, up to the limit
  508                  * in addr.
  509                  *
  510                  * If we don't use the MAP_STACK option, the effect
  511                  * of this code is to allocate a stack region of a
  512                  * fixed size of (STACK_SIZE - GUARD_SIZE).
  513                  */
  514 
  515                 if ((caddr_t)PTRIN(addr) + len > p->p_vmspace->vm_maxsaddr) {
  516                         /* 
  517                          * Some linux apps will attempt to mmap
  518                          * thread stacks near the top of their
  519                          * address space.  If their TOS is greater
  520                          * than vm_maxsaddr, vm_map_growstack()
  521                          * will confuse the thread stack with the
  522                          * process stack and deliver a SEGV if they
  523                          * attempt to grow the thread stack past their
  524                          * current stacksize rlimit.  To avoid this,
  525                          * adjust vm_maxsaddr upwards to reflect
  526                          * the current stacksize rlimit rather
  527                          * than the maximum possible stacksize.
  528                          * It would be better to adjust the
  529                          * mmap'ed region, but some apps do not check
  530                          * mmap's return value.
  531                          */
  532                         PROC_LOCK(p);
  533                         p->p_vmspace->vm_maxsaddr = (char *)USRSTACK -
  534                             lim_cur(p, RLIMIT_STACK);
  535                         PROC_UNLOCK(p);
  536                 }
  537 
  538                 /*
  539                  * This gives us our maximum stack size and a new BOS.
  540                  * If we're using VM_STACK, then mmap will just map
  541                  * the top SGROWSIZ bytes, and let the stack grow down
  542                  * to the limit at BOS.  If we're not using VM_STACK
  543                  * we map the full stack, since we don't have a way
  544                  * to autogrow it.
  545                  */
  546                 if (len > STACK_SIZE - GUARD_SIZE) {
  547                         bsd_args.addr = (caddr_t)PTRIN(addr);
  548                         bsd_args.len = len;
  549                 } else {
  550                         bsd_args.addr = (caddr_t)PTRIN(addr) -
  551                             (STACK_SIZE - GUARD_SIZE - len);
  552                         bsd_args.len = STACK_SIZE - GUARD_SIZE;
  553                 }
  554         } else {
  555                 bsd_args.addr = (caddr_t)PTRIN(addr);
  556                 bsd_args.len  = len;
  557         }
  558         bsd_args.pos = pos;
  559 
  560 #ifdef DEBUG
  561         if (ldebug(mmap))
  562                 printf("-> %s(%p, %d, %d, 0x%08x, %d, 0x%x)\n",
  563                     __func__,
  564                     (void *)bsd_args.addr, bsd_args.len, bsd_args.prot,
  565                     bsd_args.flags, bsd_args.fd, (int)bsd_args.pos);
  566 #endif
  567         error = sys_mmap(td, &bsd_args);
  568 #ifdef DEBUG
  569         if (ldebug(mmap))
  570                 printf("-> %s() return: 0x%x (0x%08x)\n",
  571                         __func__, error, (u_int)td->td_retval[0]);
  572 #endif
  573         return (error);
  574 }
  575 
  576 int
  577 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
  578 {
  579         struct mprotect_args bsd_args;
  580 
  581         bsd_args.addr = uap->addr;
  582         bsd_args.len = uap->len;
  583         bsd_args.prot = uap->prot;
  584         if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
  585                 bsd_args.prot |= PROT_READ | PROT_EXEC;
  586         return (sys_mprotect(td, &bsd_args));
  587 }
  588 
  589 int
  590 linux_ioperm(struct thread *td, struct linux_ioperm_args *args)
  591 {
  592         int error;
  593         struct i386_ioperm_args iia;
  594 
  595         iia.start = args->start;
  596         iia.length = args->length;
  597         iia.enable = args->enable;
  598         error = i386_set_ioperm(td, &iia);
  599         return (error);
  600 }
  601 
  602 int
  603 linux_iopl(struct thread *td, struct linux_iopl_args *args)
  604 {
  605         int error;
  606 
  607         if (args->level < 0 || args->level > 3)
  608                 return (EINVAL);
  609         if ((error = priv_check(td, PRIV_IO)) != 0)
  610                 return (error);
  611         if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
  612                 return (error);
  613         td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) |
  614             (args->level * (PSL_IOPL / 3));
  615         return (0);
  616 }
  617 
  618 int
  619 linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap)
  620 {
  621         int error;
  622         struct i386_ldt_args ldt;
  623         struct l_descriptor ld;
  624         union descriptor desc;
  625         int size, written;
  626 
  627         switch (uap->func) {
  628         case 0x00: /* read_ldt */
  629                 ldt.start = 0;
  630                 ldt.descs = uap->ptr;
  631                 ldt.num = uap->bytecount / sizeof(union descriptor);
  632                 error = i386_get_ldt(td, &ldt);
  633                 td->td_retval[0] *= sizeof(union descriptor);
  634                 break;
  635         case 0x02: /* read_default_ldt = 0 */
  636                 size = 5*sizeof(struct l_desc_struct);
  637                 if (size > uap->bytecount)
  638                         size = uap->bytecount;
  639                 for (written = error = 0; written < size && error == 0; written++)
  640                         error = subyte((char *)uap->ptr + written, 0);
  641                 td->td_retval[0] = written;
  642                 break;
  643         case 0x01: /* write_ldt */
  644         case 0x11: /* write_ldt */
  645                 if (uap->bytecount != sizeof(ld))
  646                         return (EINVAL);
  647 
  648                 error = copyin(uap->ptr, &ld, sizeof(ld));
  649                 if (error)
  650                         return (error);
  651 
  652                 ldt.start = ld.entry_number;
  653                 ldt.descs = &desc;
  654                 ldt.num = 1;
  655                 desc.sd.sd_lolimit = (ld.limit & 0x0000ffff);
  656                 desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16;
  657                 desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff);
  658                 desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24;
  659                 desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) |
  660                         (ld.contents << 2);
  661                 desc.sd.sd_dpl = 3;
  662                 desc.sd.sd_p = (ld.seg_not_present ^ 1);
  663                 desc.sd.sd_xx = 0;
  664                 desc.sd.sd_def32 = ld.seg_32bit;
  665                 desc.sd.sd_gran = ld.limit_in_pages;
  666                 error = i386_set_ldt(td, &ldt, &desc);
  667                 break;
  668         default:
  669                 error = ENOSYS;
  670                 break;
  671         }
  672 
  673         if (error == EOPNOTSUPP) {
  674                 printf("linux: modify_ldt needs kernel option USER_LDT\n");
  675                 error = ENOSYS;
  676         }
  677 
  678         return (error);
  679 }
  680 
  681 int
  682 linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
  683 {
  684         l_osigaction_t osa;
  685         l_sigaction_t act, oact;
  686         int error;
  687 
  688 #ifdef DEBUG
  689         if (ldebug(sigaction))
  690                 printf(ARGS(sigaction, "%d, %p, %p"),
  691                     args->sig, (void *)args->nsa, (void *)args->osa);
  692 #endif
  693 
  694         if (args->nsa != NULL) {
  695                 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
  696                 if (error)
  697                         return (error);
  698                 act.lsa_handler = osa.lsa_handler;
  699                 act.lsa_flags = osa.lsa_flags;
  700                 act.lsa_restorer = osa.lsa_restorer;
  701                 LINUX_SIGEMPTYSET(act.lsa_mask);
  702                 act.lsa_mask.__bits[0] = osa.lsa_mask;
  703         }
  704 
  705         error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
  706             args->osa ? &oact : NULL);
  707 
  708         if (args->osa != NULL && !error) {
  709                 osa.lsa_handler = oact.lsa_handler;
  710                 osa.lsa_flags = oact.lsa_flags;
  711                 osa.lsa_restorer = oact.lsa_restorer;
  712                 osa.lsa_mask = oact.lsa_mask.__bits[0];
  713                 error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
  714         }
  715 
  716         return (error);
  717 }
  718 
  719 /*
  720  * Linux has two extra args, restart and oldmask.  We dont use these,
  721  * but it seems that "restart" is actually a context pointer that
  722  * enables the signal to happen with a different register set.
  723  */
  724 int
  725 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
  726 {
  727         sigset_t sigmask;
  728         l_sigset_t mask;
  729 
  730 #ifdef DEBUG
  731         if (ldebug(sigsuspend))
  732                 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask);
  733 #endif
  734 
  735         LINUX_SIGEMPTYSET(mask);
  736         mask.__bits[0] = args->mask;
  737         linux_to_bsd_sigset(&mask, &sigmask);
  738         return (kern_sigsuspend(td, sigmask));
  739 }
  740 
  741 int
  742 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
  743 {
  744         l_sigset_t lmask;
  745         sigset_t sigmask;
  746         int error;
  747 
  748 #ifdef DEBUG
  749         if (ldebug(rt_sigsuspend))
  750                 printf(ARGS(rt_sigsuspend, "%p, %d"),
  751                     (void *)uap->newset, uap->sigsetsize);
  752 #endif
  753 
  754         if (uap->sigsetsize != sizeof(l_sigset_t))
  755                 return (EINVAL);
  756 
  757         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
  758         if (error)
  759                 return (error);
  760 
  761         linux_to_bsd_sigset(&lmask, &sigmask);
  762         return (kern_sigsuspend(td, sigmask));
  763 }
  764 
  765 int
  766 linux_pause(struct thread *td, struct linux_pause_args *args)
  767 {
  768         struct proc *p = td->td_proc;
  769         sigset_t sigmask;
  770 
  771 #ifdef DEBUG
  772         if (ldebug(pause))
  773                 printf(ARGS(pause, ""));
  774 #endif
  775 
  776         PROC_LOCK(p);
  777         sigmask = td->td_sigmask;
  778         PROC_UNLOCK(p);
  779         return (kern_sigsuspend(td, sigmask));
  780 }
  781 
  782 int
  783 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
  784 {
  785         stack_t ss, oss;
  786         l_stack_t lss;
  787         int error;
  788 
  789 #ifdef DEBUG
  790         if (ldebug(sigaltstack))
  791                 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss);
  792 #endif
  793 
  794         if (uap->uss != NULL) {
  795                 error = copyin(uap->uss, &lss, sizeof(l_stack_t));
  796                 if (error)
  797                         return (error);
  798 
  799                 ss.ss_sp = lss.ss_sp;
  800                 ss.ss_size = lss.ss_size;
  801                 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
  802         }
  803         error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
  804             (uap->uoss != NULL) ? &oss : NULL);
  805         if (!error && uap->uoss != NULL) {
  806                 lss.ss_sp = oss.ss_sp;
  807                 lss.ss_size = oss.ss_size;
  808                 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
  809                 error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
  810         }
  811 
  812         return (error);
  813 }
  814 
  815 int
  816 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
  817 {
  818         struct ftruncate_args sa;
  819 
  820 #ifdef DEBUG
  821         if (ldebug(ftruncate64))
  822                 printf(ARGS(ftruncate64, "%u, %jd"), args->fd,
  823                     (intmax_t)args->length);
  824 #endif
  825 
  826         sa.fd = args->fd;
  827         sa.length = args->length;
  828         return sys_ftruncate(td, &sa);
  829 }
  830 
  831 int
  832 linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args)
  833 {
  834         struct l_user_desc info;
  835         int error;
  836         int idx;
  837         int a[2];
  838         struct segment_descriptor sd;
  839 
  840         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
  841         if (error)
  842                 return (error);
  843 
  844 #ifdef DEBUG
  845         if (ldebug(set_thread_area))
  846                 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, %i, %i, %i\n"),
  847                       info.entry_number,
  848                       info.base_addr,
  849                       info.limit,
  850                       info.seg_32bit,
  851                       info.contents,
  852                       info.read_exec_only,
  853                       info.limit_in_pages,
  854                       info.seg_not_present,
  855                       info.useable);
  856 #endif
  857 
  858         idx = info.entry_number;
  859         /* 
  860          * Semantics of linux version: every thread in the system has array of
  861          * 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This 
  862          * syscall loads one of the selected tls decriptors with a value and
  863          * also loads GDT descriptors 6, 7 and 8 with the content of the
  864          * per-thread descriptors.
  865          *
  866          * Semantics of fbsd version: I think we can ignore that linux has 3 
  867          * per-thread descriptors and use just the 1st one. The tls_array[]
  868          * is used only in set/get-thread_area() syscalls and for loading the
  869          * GDT descriptors. In fbsd we use just one GDT descriptor for TLS so
  870          * we will load just one. 
  871          *
  872          * XXX: this doesn't work when a user space process tries to use more
  873          * than 1 TLS segment. Comment in the linux sources says wine might do
  874          * this.
  875          */
  876 
  877         /* 
  878          * we support just GLIBC TLS now 
  879          * we should let 3 proceed as well because we use this segment so
  880          * if code does two subsequent calls it should succeed
  881          */
  882         if (idx != 6 && idx != -1 && idx != 3)
  883                 return (EINVAL);
  884 
  885         /* 
  886          * we have to copy out the GDT entry we use
  887          * FreeBSD uses GDT entry #3 for storing %gs so load that
  888          *
  889          * XXX: what if a user space program doesn't check this value and tries
  890          * to use 6, 7 or 8? 
  891          */
  892         idx = info.entry_number = 3;
  893         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
  894         if (error)
  895                 return (error);
  896 
  897         if (LINUX_LDT_empty(&info)) {
  898                 a[0] = 0;
  899                 a[1] = 0;
  900         } else {
  901                 a[0] = LINUX_LDT_entry_a(&info);
  902                 a[1] = LINUX_LDT_entry_b(&info);
  903         }
  904 
  905         memcpy(&sd, &a, sizeof(a));
  906 #ifdef DEBUG
  907         if (ldebug(set_thread_area))
  908                 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,
  909                         sd.sd_hibase,
  910                         sd.sd_lolimit,
  911                         sd.sd_hilimit,
  912                         sd.sd_type,
  913                         sd.sd_dpl,
  914                         sd.sd_p,
  915                         sd.sd_xx,
  916                         sd.sd_def32,
  917                         sd.sd_gran);
  918 #endif
  919 
  920         /* this is taken from i386 version of cpu_set_user_tls() */
  921         critical_enter();
  922         /* set %gs */
  923         td->td_pcb->pcb_gsd = sd;
  924         PCPU_GET(fsgs_gdt)[1] = sd;
  925         load_gs(GSEL(GUGS_SEL, SEL_UPL));
  926         critical_exit();
  927    
  928         return (0);
  929 }
  930 
  931 int
  932 linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args)
  933 {
  934         
  935         struct l_user_desc info;
  936         int error;
  937         int idx;
  938         struct l_desc_struct desc;
  939         struct segment_descriptor sd;
  940 
  941 #ifdef DEBUG
  942         if (ldebug(get_thread_area))
  943                 printf(ARGS(get_thread_area, "%p"), args->desc);
  944 #endif
  945 
  946         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
  947         if (error)
  948                 return (error);
  949 
  950         idx = info.entry_number;
  951         /* XXX: I am not sure if we want 3 to be allowed too. */
  952         if (idx != 6 && idx != 3)
  953                 return (EINVAL);
  954 
  955         idx = 3;
  956 
  957         memset(&info, 0, sizeof(info));
  958 
  959         sd = PCPU_GET(fsgs_gdt)[1];
  960 
  961         memcpy(&desc, &sd, sizeof(desc));
  962 
  963         info.entry_number = idx;
  964         info.base_addr = LINUX_GET_BASE(&desc);
  965         info.limit = LINUX_GET_LIMIT(&desc);
  966         info.seg_32bit = LINUX_GET_32BIT(&desc);
  967         info.contents = LINUX_GET_CONTENTS(&desc);
  968         info.read_exec_only = !LINUX_GET_WRITABLE(&desc);
  969         info.limit_in_pages = LINUX_GET_LIMIT_PAGES(&desc);
  970         info.seg_not_present = !LINUX_GET_PRESENT(&desc);
  971         info.useable = LINUX_GET_USEABLE(&desc);
  972 
  973         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
  974         if (error)
  975                 return (EFAULT);
  976 
  977         return (0);
  978 }
  979 
  980 /* XXX: this wont work with module - convert it */
  981 int
  982 linux_mq_open(struct thread *td, struct linux_mq_open_args *args)
  983 {
  984 #ifdef P1003_1B_MQUEUE
  985         return sys_kmq_open(td, (struct kmq_open_args *) args);
  986 #else
  987         return (ENOSYS);
  988 #endif
  989 }
  990 
  991 int
  992 linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args)
  993 {
  994 #ifdef P1003_1B_MQUEUE
  995         return sys_kmq_unlink(td, (struct kmq_unlink_args *) args);
  996 #else
  997         return (ENOSYS);
  998 #endif
  999 }
 1000 
 1001 int
 1002 linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args)
 1003 {
 1004 #ifdef P1003_1B_MQUEUE
 1005         return sys_kmq_timedsend(td, (struct kmq_timedsend_args *) args);
 1006 #else
 1007         return (ENOSYS);
 1008 #endif
 1009 }
 1010 
 1011 int
 1012 linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args)
 1013 {
 1014 #ifdef P1003_1B_MQUEUE
 1015         return sys_kmq_timedreceive(td, (struct kmq_timedreceive_args *) args);
 1016 #else
 1017         return (ENOSYS);
 1018 #endif
 1019 }
 1020 
 1021 int
 1022 linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args)
 1023 {
 1024 #ifdef P1003_1B_MQUEUE
 1025         return sys_kmq_notify(td, (struct kmq_notify_args *) args);
 1026 #else
 1027         return (ENOSYS);
 1028 #endif
 1029 }
 1030 
 1031 int
 1032 linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args)
 1033 {
 1034 #ifdef P1003_1B_MQUEUE
 1035         return sys_kmq_setattr(td, (struct kmq_setattr_args *) args);
 1036 #else
 1037         return (ENOSYS);
 1038 #endif
 1039 }
 1040 
 1041 int
 1042 linux_wait4(struct thread *td, struct linux_wait4_args *args)
 1043 {
 1044         int error, options;
 1045         struct rusage ru, *rup;
 1046 
 1047 #ifdef DEBUG
 1048         if (ldebug(wait4))
 1049                 printf(ARGS(wait4, "%d, %p, %d, %p"),
 1050                     args->pid, (void *)args->status, args->options,
 1051                     (void *)args->rusage);
 1052 #endif
 1053 
 1054         options = (args->options & (WNOHANG | WUNTRACED));
 1055         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
 1056         if (args->options & __WCLONE)
 1057                 options |= WLINUXCLONE;
 1058 
 1059         if (args->rusage != NULL)
 1060                 rup = &ru;
 1061         else
 1062                 rup = NULL;
 1063         error = linux_common_wait(td, args->pid, args->status, options, rup);
 1064         if (error)
 1065                 return (error);
 1066         if (args->rusage != NULL)
 1067                 error = copyout(&ru, args->rusage, sizeof(ru));
 1068 
 1069         return (error);
 1070 }

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