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/amd64/linux32/linux32_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2004 Tim J. Robbins
    5  * Copyright (c) 2002 Doug Rabson
    6  * Copyright (c) 2000 Marcel Moolenaar
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer
   14  *    in this position and unchanged.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: stable/12/sys/amd64/linux32/linux32_machdep.c 337431 2018-08-07 18:29:10Z kib $");
   35 
   36 #include "opt_compat.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/capsicum.h>
   40 #include <sys/clock.h>
   41 #include <sys/fcntl.h>
   42 #include <sys/file.h>
   43 #include <sys/imgact.h>
   44 #include <sys/kernel.h>
   45 #include <sys/limits.h>
   46 #include <sys/lock.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mman.h>
   49 #include <sys/mutex.h>
   50 #include <sys/priv.h>
   51 #include <sys/proc.h>
   52 #include <sys/resource.h>
   53 #include <sys/resourcevar.h>
   54 #include <sys/syscallsubr.h>
   55 #include <sys/sysproto.h>
   56 #include <sys/systm.h>
   57 #include <sys/unistd.h>
   58 #include <sys/wait.h>
   59 
   60 #include <machine/frame.h>
   61 #include <machine/md_var.h>
   62 #include <machine/pcb.h>
   63 #include <machine/psl.h>
   64 #include <machine/segments.h>
   65 #include <machine/specialreg.h>
   66 #include <x86/ifunc.h>
   67 
   68 #include <vm/pmap.h>
   69 #include <vm/vm.h>
   70 #include <vm/vm_map.h>
   71 
   72 #include <compat/freebsd32/freebsd32_util.h>
   73 #include <amd64/linux32/linux.h>
   74 #include <amd64/linux32/linux32_proto.h>
   75 #include <compat/linux/linux_emul.h>
   76 #include <compat/linux/linux_ipc.h>
   77 #include <compat/linux/linux_misc.h>
   78 #include <compat/linux/linux_mmap.h>
   79 #include <compat/linux/linux_signal.h>
   80 #include <compat/linux/linux_util.h>
   81 
   82 static void     bsd_to_linux_rusage(struct rusage *ru, struct l_rusage *lru);
   83 
   84 struct l_old_select_argv {
   85         l_int           nfds;
   86         l_uintptr_t     readfds;
   87         l_uintptr_t     writefds;
   88         l_uintptr_t     exceptfds;
   89         l_uintptr_t     timeout;
   90 } __packed;
   91 
   92 
   93 static void
   94 bsd_to_linux_rusage(struct rusage *ru, struct l_rusage *lru)
   95 {
   96 
   97         lru->ru_utime.tv_sec = ru->ru_utime.tv_sec;
   98         lru->ru_utime.tv_usec = ru->ru_utime.tv_usec;
   99         lru->ru_stime.tv_sec = ru->ru_stime.tv_sec;
  100         lru->ru_stime.tv_usec = ru->ru_stime.tv_usec;
  101         lru->ru_maxrss = ru->ru_maxrss;
  102         lru->ru_ixrss = ru->ru_ixrss;
  103         lru->ru_idrss = ru->ru_idrss;
  104         lru->ru_isrss = ru->ru_isrss;
  105         lru->ru_minflt = ru->ru_minflt;
  106         lru->ru_majflt = ru->ru_majflt;
  107         lru->ru_nswap = ru->ru_nswap;
  108         lru->ru_inblock = ru->ru_inblock;
  109         lru->ru_oublock = ru->ru_oublock;
  110         lru->ru_msgsnd = ru->ru_msgsnd;
  111         lru->ru_msgrcv = ru->ru_msgrcv;
  112         lru->ru_nsignals = ru->ru_nsignals;
  113         lru->ru_nvcsw = ru->ru_nvcsw;
  114         lru->ru_nivcsw = ru->ru_nivcsw;
  115 }
  116 
  117 int
  118 linux_copyout_rusage(struct rusage *ru, void *uaddr)
  119 {
  120         struct l_rusage lru;
  121 
  122         bsd_to_linux_rusage(ru, &lru);
  123 
  124         return (copyout(&lru, uaddr, sizeof(struct l_rusage)));
  125 }
  126 
  127 int
  128 linux_execve(struct thread *td, struct linux_execve_args *args)
  129 {
  130         struct image_args eargs;
  131         char *path;
  132         int error;
  133 
  134         LCONVPATHEXIST(td, args->path, &path);
  135 
  136 #ifdef DEBUG
  137         if (ldebug(execve))
  138                 printf(ARGS(execve, "%s"), path);
  139 #endif
  140 
  141         error = freebsd32_exec_copyin_args(&eargs, path, UIO_SYSSPACE,
  142             args->argp, args->envp);
  143         free(path, M_TEMP);
  144         if (error == 0)
  145                 error = linux_common_execve(td, &eargs);
  146         return (error);
  147 }
  148 
  149 CTASSERT(sizeof(struct l_iovec32) == 8);
  150 
  151 int
  152 linux32_copyinuio(struct l_iovec32 *iovp, l_ulong iovcnt, struct uio **uiop)
  153 {
  154         struct l_iovec32 iov32;
  155         struct iovec *iov;
  156         struct uio *uio;
  157         uint32_t iovlen;
  158         int error, i;
  159 
  160         *uiop = NULL;
  161         if (iovcnt > UIO_MAXIOV)
  162                 return (EINVAL);
  163         iovlen = iovcnt * sizeof(struct iovec);
  164         uio = malloc(iovlen + sizeof(*uio), M_IOV, M_WAITOK);
  165         iov = (struct iovec *)(uio + 1);
  166         for (i = 0; i < iovcnt; i++) {
  167                 error = copyin(&iovp[i], &iov32, sizeof(struct l_iovec32));
  168                 if (error) {
  169                         free(uio, M_IOV);
  170                         return (error);
  171                 }
  172                 iov[i].iov_base = PTRIN(iov32.iov_base);
  173                 iov[i].iov_len = iov32.iov_len;
  174         }
  175         uio->uio_iov = iov;
  176         uio->uio_iovcnt = iovcnt;
  177         uio->uio_segflg = UIO_USERSPACE;
  178         uio->uio_offset = -1;
  179         uio->uio_resid = 0;
  180         for (i = 0; i < iovcnt; i++) {
  181                 if (iov->iov_len > INT_MAX - uio->uio_resid) {
  182                         free(uio, M_IOV);
  183                         return (EINVAL);
  184                 }
  185                 uio->uio_resid += iov->iov_len;
  186                 iov++;
  187         }
  188         *uiop = uio;
  189         return (0);
  190 }
  191 
  192 int
  193 linux32_copyiniov(struct l_iovec32 *iovp32, l_ulong iovcnt, struct iovec **iovp,
  194     int error)
  195 {
  196         struct l_iovec32 iov32;
  197         struct iovec *iov;
  198         uint32_t iovlen;
  199         int i;
  200 
  201         *iovp = NULL;
  202         if (iovcnt > UIO_MAXIOV)
  203                 return (error);
  204         iovlen = iovcnt * sizeof(struct iovec);
  205         iov = malloc(iovlen, M_IOV, M_WAITOK);
  206         for (i = 0; i < iovcnt; i++) {
  207                 error = copyin(&iovp32[i], &iov32, sizeof(struct l_iovec32));
  208                 if (error) {
  209                         free(iov, M_IOV);
  210                         return (error);
  211                 }
  212                 iov[i].iov_base = PTRIN(iov32.iov_base);
  213                 iov[i].iov_len = iov32.iov_len;
  214         }
  215         *iovp = iov;
  216         return(0);
  217 
  218 }
  219 
  220 int
  221 linux_readv(struct thread *td, struct linux_readv_args *uap)
  222 {
  223         struct uio *auio;
  224         int error;
  225 
  226         error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
  227         if (error)
  228                 return (error);
  229         error = kern_readv(td, uap->fd, auio);
  230         free(auio, M_IOV);
  231         return (error);
  232 }
  233 
  234 int
  235 linux_writev(struct thread *td, struct linux_writev_args *uap)
  236 {
  237         struct uio *auio;
  238         int error;
  239 
  240         error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
  241         if (error)
  242                 return (error);
  243         error = kern_writev(td, uap->fd, auio);
  244         free(auio, M_IOV);
  245         return (error);
  246 }
  247 
  248 struct l_ipc_kludge {
  249         l_uintptr_t msgp;
  250         l_long msgtyp;
  251 } __packed;
  252 
  253 int
  254 linux_ipc(struct thread *td, struct linux_ipc_args *args)
  255 {
  256 
  257         switch (args->what & 0xFFFF) {
  258         case LINUX_SEMOP: {
  259                 struct linux_semop_args a;
  260 
  261                 a.semid = args->arg1;
  262                 a.tsops = args->ptr;
  263                 a.nsops = args->arg2;
  264                 return (linux_semop(td, &a));
  265         }
  266         case LINUX_SEMGET: {
  267                 struct linux_semget_args a;
  268 
  269                 a.key = args->arg1;
  270                 a.nsems = args->arg2;
  271                 a.semflg = args->arg3;
  272                 return (linux_semget(td, &a));
  273         }
  274         case LINUX_SEMCTL: {
  275                 struct linux_semctl_args a;
  276                 int error;
  277 
  278                 a.semid = args->arg1;
  279                 a.semnum = args->arg2;
  280                 a.cmd = args->arg3;
  281                 error = copyin(args->ptr, &a.arg, sizeof(a.arg));
  282                 if (error)
  283                         return (error);
  284                 return (linux_semctl(td, &a));
  285         }
  286         case LINUX_MSGSND: {
  287                 struct linux_msgsnd_args a;
  288 
  289                 a.msqid = args->arg1;
  290                 a.msgp = args->ptr;
  291                 a.msgsz = args->arg2;
  292                 a.msgflg = args->arg3;
  293                 return (linux_msgsnd(td, &a));
  294         }
  295         case LINUX_MSGRCV: {
  296                 struct linux_msgrcv_args a;
  297 
  298                 a.msqid = args->arg1;
  299                 a.msgsz = args->arg2;
  300                 a.msgflg = args->arg3;
  301                 if ((args->what >> 16) == 0) {
  302                         struct l_ipc_kludge tmp;
  303                         int error;
  304 
  305                         if (args->ptr == 0)
  306                                 return (EINVAL);
  307                         error = copyin(args->ptr, &tmp, sizeof(tmp));
  308                         if (error)
  309                                 return (error);
  310                         a.msgp = PTRIN(tmp.msgp);
  311                         a.msgtyp = tmp.msgtyp;
  312                 } else {
  313                         a.msgp = args->ptr;
  314                         a.msgtyp = args->arg5;
  315                 }
  316                 return (linux_msgrcv(td, &a));
  317         }
  318         case LINUX_MSGGET: {
  319                 struct linux_msgget_args a;
  320 
  321                 a.key = args->arg1;
  322                 a.msgflg = args->arg2;
  323                 return (linux_msgget(td, &a));
  324         }
  325         case LINUX_MSGCTL: {
  326                 struct linux_msgctl_args a;
  327 
  328                 a.msqid = args->arg1;
  329                 a.cmd = args->arg2;
  330                 a.buf = args->ptr;
  331                 return (linux_msgctl(td, &a));
  332         }
  333         case LINUX_SHMAT: {
  334                 struct linux_shmat_args a;
  335 
  336                 a.shmid = args->arg1;
  337                 a.shmaddr = args->ptr;
  338                 a.shmflg = args->arg2;
  339                 a.raddr = PTRIN((l_uint)args->arg3);
  340                 return (linux_shmat(td, &a));
  341         }
  342         case LINUX_SHMDT: {
  343                 struct linux_shmdt_args a;
  344 
  345                 a.shmaddr = args->ptr;
  346                 return (linux_shmdt(td, &a));
  347         }
  348         case LINUX_SHMGET: {
  349                 struct linux_shmget_args a;
  350 
  351                 a.key = args->arg1;
  352                 a.size = args->arg2;
  353                 a.shmflg = args->arg3;
  354                 return (linux_shmget(td, &a));
  355         }
  356         case LINUX_SHMCTL: {
  357                 struct linux_shmctl_args a;
  358 
  359                 a.shmid = args->arg1;
  360                 a.cmd = args->arg2;
  361                 a.buf = args->ptr;
  362                 return (linux_shmctl(td, &a));
  363         }
  364         default:
  365                 break;
  366         }
  367 
  368         return (EINVAL);
  369 }
  370 
  371 int
  372 linux_old_select(struct thread *td, struct linux_old_select_args *args)
  373 {
  374         struct l_old_select_argv linux_args;
  375         struct linux_select_args newsel;
  376         int error;
  377 
  378 #ifdef DEBUG
  379         if (ldebug(old_select))
  380                 printf(ARGS(old_select, "%p"), args->ptr);
  381 #endif
  382 
  383         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  384         if (error)
  385                 return (error);
  386 
  387         newsel.nfds = linux_args.nfds;
  388         newsel.readfds = PTRIN(linux_args.readfds);
  389         newsel.writefds = PTRIN(linux_args.writefds);
  390         newsel.exceptfds = PTRIN(linux_args.exceptfds);
  391         newsel.timeout = PTRIN(linux_args.timeout);
  392         return (linux_select(td, &newsel));
  393 }
  394 
  395 int
  396 linux_set_cloned_tls(struct thread *td, void *desc)
  397 {
  398         struct user_segment_descriptor sd;
  399         struct l_user_desc info;
  400         struct pcb *pcb;
  401         int error;
  402         int a[2];
  403 
  404         error = copyin(desc, &info, sizeof(struct l_user_desc));
  405         if (error) {
  406                 printf(LMSG("copyin failed!"));
  407         } else {
  408                 /* We might copy out the entry_number as GUGS32_SEL. */
  409                 info.entry_number = GUGS32_SEL;
  410                 error = copyout(&info, desc, sizeof(struct l_user_desc));
  411                 if (error)
  412                         printf(LMSG("copyout failed!"));
  413 
  414                 a[0] = LINUX_LDT_entry_a(&info);
  415                 a[1] = LINUX_LDT_entry_b(&info);
  416 
  417                 memcpy(&sd, &a, sizeof(a));
  418 #ifdef DEBUG
  419                 if (ldebug(clone))
  420                         printf("Segment created in clone with "
  421                             "CLONE_SETTLS: lobase: %x, hibase: %x, "
  422                             "lolimit: %x, hilimit: %x, type: %i, "
  423                             "dpl: %i, p: %i, xx: %i, long: %i, "
  424                             "def32: %i, gran: %i\n", sd.sd_lobase,
  425                             sd.sd_hibase, sd.sd_lolimit, sd.sd_hilimit,
  426                             sd.sd_type, sd.sd_dpl, sd.sd_p, sd.sd_xx,
  427                             sd.sd_long, sd.sd_def32, sd.sd_gran);
  428 #endif
  429                 pcb = td->td_pcb;
  430                 pcb->pcb_gsbase = (register_t)info.base_addr;
  431                 td->td_frame->tf_gs = GSEL(GUGS32_SEL, SEL_UPL);
  432                 set_pcb_flags(pcb, PCB_32BIT);
  433         }
  434 
  435         return (error);
  436 }
  437 
  438 int
  439 linux_set_upcall_kse(struct thread *td, register_t stack)
  440 {
  441 
  442         if (stack)
  443                 td->td_frame->tf_rsp = stack;
  444 
  445         /*
  446          * The newly created Linux thread returns
  447          * to the user space by the same path that a parent do.
  448          */
  449         td->td_frame->tf_rax = 0;
  450         return (0);
  451 }
  452 
  453 int
  454 linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
  455 {
  456 
  457 #ifdef DEBUG
  458         if (ldebug(mmap2))
  459                 printf(ARGS(mmap2, "0x%08x, %d, %d, 0x%08x, %d, %d"),
  460                     args->addr, args->len, args->prot,
  461                     args->flags, args->fd, args->pgoff);
  462 #endif
  463 
  464         return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
  465                 args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
  466                 PAGE_SIZE));
  467 }
  468 
  469 int
  470 linux_mmap(struct thread *td, struct linux_mmap_args *args)
  471 {
  472         int error;
  473         struct l_mmap_argv linux_args;
  474 
  475         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  476         if (error)
  477                 return (error);
  478 
  479 #ifdef DEBUG
  480         if (ldebug(mmap))
  481                 printf(ARGS(mmap, "0x%08x, %d, %d, 0x%08x, %d, %d"),
  482                     linux_args.addr, linux_args.len, linux_args.prot,
  483                     linux_args.flags, linux_args.fd, linux_args.pgoff);
  484 #endif
  485 
  486         return (linux_mmap_common(td, linux_args.addr, linux_args.len,
  487             linux_args.prot, linux_args.flags, linux_args.fd,
  488             (uint32_t)linux_args.pgoff));
  489 }
  490 
  491 int
  492 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
  493 {
  494 
  495         return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot));
  496 }
  497 
  498 int
  499 linux_iopl(struct thread *td, struct linux_iopl_args *args)
  500 {
  501         int error;
  502 
  503         if (args->level < 0 || args->level > 3)
  504                 return (EINVAL);
  505         if ((error = priv_check(td, PRIV_IO)) != 0)
  506                 return (error);
  507         if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
  508                 return (error);
  509         td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) |
  510             (args->level * (PSL_IOPL / 3));
  511 
  512         return (0);
  513 }
  514 
  515 int
  516 linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
  517 {
  518         l_osigaction_t osa;
  519         l_sigaction_t act, oact;
  520         int error;
  521 
  522 #ifdef DEBUG
  523         if (ldebug(sigaction))
  524                 printf(ARGS(sigaction, "%d, %p, %p"),
  525                     args->sig, (void *)args->nsa, (void *)args->osa);
  526 #endif
  527 
  528         if (args->nsa != NULL) {
  529                 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
  530                 if (error)
  531                         return (error);
  532                 act.lsa_handler = osa.lsa_handler;
  533                 act.lsa_flags = osa.lsa_flags;
  534                 act.lsa_restorer = osa.lsa_restorer;
  535                 LINUX_SIGEMPTYSET(act.lsa_mask);
  536                 act.lsa_mask.__mask = osa.lsa_mask;
  537         }
  538 
  539         error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
  540             args->osa ? &oact : NULL);
  541 
  542         if (args->osa != NULL && !error) {
  543                 osa.lsa_handler = oact.lsa_handler;
  544                 osa.lsa_flags = oact.lsa_flags;
  545                 osa.lsa_restorer = oact.lsa_restorer;
  546                 osa.lsa_mask = oact.lsa_mask.__mask;
  547                 error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
  548         }
  549 
  550         return (error);
  551 }
  552 
  553 /*
  554  * Linux has two extra args, restart and oldmask.  We don't use these,
  555  * but it seems that "restart" is actually a context pointer that
  556  * enables the signal to happen with a different register set.
  557  */
  558 int
  559 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
  560 {
  561         sigset_t sigmask;
  562         l_sigset_t mask;
  563 
  564 #ifdef DEBUG
  565         if (ldebug(sigsuspend))
  566                 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask);
  567 #endif
  568 
  569         LINUX_SIGEMPTYSET(mask);
  570         mask.__mask = args->mask;
  571         linux_to_bsd_sigset(&mask, &sigmask);
  572         return (kern_sigsuspend(td, sigmask));
  573 }
  574 
  575 int
  576 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
  577 {
  578         l_sigset_t lmask;
  579         sigset_t sigmask;
  580         int error;
  581 
  582 #ifdef DEBUG
  583         if (ldebug(rt_sigsuspend))
  584                 printf(ARGS(rt_sigsuspend, "%p, %d"),
  585                     (void *)uap->newset, uap->sigsetsize);
  586 #endif
  587 
  588         if (uap->sigsetsize != sizeof(l_sigset_t))
  589                 return (EINVAL);
  590 
  591         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
  592         if (error)
  593                 return (error);
  594 
  595         linux_to_bsd_sigset(&lmask, &sigmask);
  596         return (kern_sigsuspend(td, sigmask));
  597 }
  598 
  599 int
  600 linux_pause(struct thread *td, struct linux_pause_args *args)
  601 {
  602         struct proc *p = td->td_proc;
  603         sigset_t sigmask;
  604 
  605 #ifdef DEBUG
  606         if (ldebug(pause))
  607                 printf(ARGS(pause, ""));
  608 #endif
  609 
  610         PROC_LOCK(p);
  611         sigmask = td->td_sigmask;
  612         PROC_UNLOCK(p);
  613         return (kern_sigsuspend(td, sigmask));
  614 }
  615 
  616 int
  617 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
  618 {
  619         stack_t ss, oss;
  620         l_stack_t lss;
  621         int error;
  622 
  623 #ifdef DEBUG
  624         if (ldebug(sigaltstack))
  625                 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss);
  626 #endif
  627 
  628         if (uap->uss != NULL) {
  629                 error = copyin(uap->uss, &lss, sizeof(l_stack_t));
  630                 if (error)
  631                         return (error);
  632 
  633                 ss.ss_sp = PTRIN(lss.ss_sp);
  634                 ss.ss_size = lss.ss_size;
  635                 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
  636         }
  637         error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
  638             (uap->uoss != NULL) ? &oss : NULL);
  639         if (!error && uap->uoss != NULL) {
  640                 lss.ss_sp = PTROUT(oss.ss_sp);
  641                 lss.ss_size = oss.ss_size;
  642                 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
  643                 error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
  644         }
  645 
  646         return (error);
  647 }
  648 
  649 int
  650 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
  651 {
  652 
  653 #ifdef DEBUG
  654         if (ldebug(ftruncate64))
  655                 printf(ARGS(ftruncate64, "%u, %jd"), args->fd,
  656                     (intmax_t)args->length);
  657 #endif
  658 
  659         return (kern_ftruncate(td, args->fd, args->length));
  660 }
  661 
  662 int
  663 linux_gettimeofday(struct thread *td, struct linux_gettimeofday_args *uap)
  664 {
  665         struct timeval atv;
  666         l_timeval atv32;
  667         struct timezone rtz;
  668         int error = 0;
  669 
  670         if (uap->tp) {
  671                 microtime(&atv);
  672                 atv32.tv_sec = atv.tv_sec;
  673                 atv32.tv_usec = atv.tv_usec;
  674                 error = copyout(&atv32, uap->tp, sizeof(atv32));
  675         }
  676         if (error == 0 && uap->tzp != NULL) {
  677                 rtz.tz_minuteswest = tz_minuteswest;
  678                 rtz.tz_dsttime = tz_dsttime;
  679                 error = copyout(&rtz, uap->tzp, sizeof(rtz));
  680         }
  681         return (error);
  682 }
  683 
  684 int
  685 linux_settimeofday(struct thread *td, struct linux_settimeofday_args *uap)
  686 {
  687         l_timeval atv32;
  688         struct timeval atv, *tvp;
  689         struct timezone atz, *tzp;
  690         int error;
  691 
  692         if (uap->tp) {
  693                 error = copyin(uap->tp, &atv32, sizeof(atv32));
  694                 if (error)
  695                         return (error);
  696                 atv.tv_sec = atv32.tv_sec;
  697                 atv.tv_usec = atv32.tv_usec;
  698                 tvp = &atv;
  699         } else
  700                 tvp = NULL;
  701         if (uap->tzp) {
  702                 error = copyin(uap->tzp, &atz, sizeof(atz));
  703                 if (error)
  704                         return (error);
  705                 tzp = &atz;
  706         } else
  707                 tzp = NULL;
  708         return (kern_settimeofday(td, tvp, tzp));
  709 }
  710 
  711 int
  712 linux_getrusage(struct thread *td, struct linux_getrusage_args *uap)
  713 {
  714         struct rusage s;
  715         int error;
  716 
  717         error = kern_getrusage(td, uap->who, &s);
  718         if (error != 0)
  719                 return (error);
  720         if (uap->rusage != NULL)
  721                 error = linux_copyout_rusage(&s, uap->rusage);
  722         return (error);
  723 }
  724 
  725 int
  726 linux_set_thread_area(struct thread *td,
  727     struct linux_set_thread_area_args *args)
  728 {
  729         struct l_user_desc info;
  730         struct user_segment_descriptor sd;
  731         struct pcb *pcb;
  732         int a[2];
  733         int error;
  734 
  735         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
  736         if (error)
  737                 return (error);
  738 
  739 #ifdef DEBUG
  740         if (ldebug(set_thread_area))
  741                 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, "
  742                     "%i, %i, %i"), info.entry_number, info.base_addr,
  743                     info.limit, info.seg_32bit, info.contents,
  744                     info.read_exec_only, info.limit_in_pages,
  745                     info.seg_not_present, info.useable);
  746 #endif
  747 
  748         /*
  749          * Semantics of Linux version: every thread in the system has array
  750          * of three TLS descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown.
  751          * This syscall loads one of the selected TLS decriptors with a value
  752          * and also loads GDT descriptors 6, 7 and 8 with the content of
  753          * the per-thread descriptors.
  754          *
  755          * Semantics of FreeBSD version: I think we can ignore that Linux has
  756          * three per-thread descriptors and use just the first one.
  757          * The tls_array[] is used only in [gs]et_thread_area() syscalls and
  758          * for loading the GDT descriptors. We use just one GDT descriptor
  759          * for TLS, so we will load just one.
  760          *
  761          * XXX: This doesn't work when a user space process tries to use more
  762          * than one TLS segment. Comment in the Linux source says wine might
  763          * do this.
  764          */
  765 
  766         /*
  767          * GLIBC reads current %gs and call set_thread_area() with it.
  768          * We should let GUDATA_SEL and GUGS32_SEL proceed as well because
  769          * we use these segments.
  770          */
  771         switch (info.entry_number) {
  772         case GUGS32_SEL:
  773         case GUDATA_SEL:
  774         case 6:
  775         case -1:
  776                 info.entry_number = GUGS32_SEL;
  777                 break;
  778         default:
  779                 return (EINVAL);
  780         }
  781 
  782         /*
  783          * We have to copy out the GDT entry we use.
  784          *
  785          * XXX: What if a user space program does not check the return value
  786          * and tries to use 6, 7 or 8?
  787          */
  788         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
  789         if (error)
  790                 return (error);
  791 
  792         if (LINUX_LDT_empty(&info)) {
  793                 a[0] = 0;
  794                 a[1] = 0;
  795         } else {
  796                 a[0] = LINUX_LDT_entry_a(&info);
  797                 a[1] = LINUX_LDT_entry_b(&info);
  798         }
  799 
  800         memcpy(&sd, &a, sizeof(a));
  801 #ifdef DEBUG
  802         if (ldebug(set_thread_area))
  803                 printf("Segment created in set_thread_area: "
  804                     "lobase: %x, hibase: %x, lolimit: %x, hilimit: %x, "
  805                     "type: %i, dpl: %i, p: %i, xx: %i, long: %i, "
  806                     "def32: %i, gran: %i\n",
  807                     sd.sd_lobase,
  808                     sd.sd_hibase,
  809                     sd.sd_lolimit,
  810                     sd.sd_hilimit,
  811                     sd.sd_type,
  812                     sd.sd_dpl,
  813                     sd.sd_p,
  814                     sd.sd_xx,
  815                     sd.sd_long,
  816                     sd.sd_def32,
  817                     sd.sd_gran);
  818 #endif
  819 
  820         pcb = td->td_pcb;
  821         pcb->pcb_gsbase = (register_t)info.base_addr;
  822         set_pcb_flags(pcb, PCB_32BIT);
  823         update_gdt_gsbase(td, info.base_addr);
  824 
  825         return (0);
  826 }
  827 
  828 int futex_xchgl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
  829 int futex_xchgl_smap(int oparg, uint32_t *uaddr, int *oldval);
  830 DEFINE_IFUNC(, int, futex_xchgl, (int, uint32_t *, int *), static)
  831 {
  832 
  833         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  834             futex_xchgl_smap : futex_xchgl_nosmap);
  835 }
  836 
  837 int futex_addl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
  838 int futex_addl_smap(int oparg, uint32_t *uaddr, int *oldval);
  839 DEFINE_IFUNC(, int, futex_addl, (int, uint32_t *, int *), static)
  840 {
  841 
  842         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  843             futex_addl_smap : futex_addl_nosmap);
  844 }
  845 
  846 int futex_orl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
  847 int futex_orl_smap(int oparg, uint32_t *uaddr, int *oldval);
  848 DEFINE_IFUNC(, int, futex_orl, (int, uint32_t *, int *), static)
  849 {
  850 
  851         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  852             futex_orl_smap : futex_orl_nosmap);
  853 }
  854 
  855 int futex_andl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
  856 int futex_andl_smap(int oparg, uint32_t *uaddr, int *oldval);
  857 DEFINE_IFUNC(, int, futex_andl, (int, uint32_t *, int *), static)
  858 {
  859 
  860         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  861             futex_andl_smap : futex_andl_nosmap);
  862 }
  863 
  864 int futex_xorl_nosmap(int oparg, uint32_t *uaddr, int *oldval);
  865 int futex_xorl_smap(int oparg, uint32_t *uaddr, int *oldval);
  866 DEFINE_IFUNC(, int, futex_xorl, (int, uint32_t *, int *), static)
  867 {
  868 
  869         return ((cpu_stdext_feature & CPUID_STDEXT_SMAP) != 0 ?
  870             futex_xorl_smap : futex_xorl_nosmap);
  871 }

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