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  * Copyright (c) 2004 Tim J. Robbins
    3  * Copyright (c) 2002 Doug Rabson
    4  * Copyright (c) 2000 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: stable/11/sys/amd64/linux32/linux32_machdep.c 346838 2019-04-28 14:16:00Z dchagin $");
   33 
   34 #include "opt_compat.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/capsicum.h>
   38 #include <sys/clock.h>
   39 #include <sys/fcntl.h>
   40 #include <sys/file.h>
   41 #include <sys/imgact.h>
   42 #include <sys/kernel.h>
   43 #include <sys/limits.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mman.h>
   47 #include <sys/mutex.h>
   48 #include <sys/priv.h>
   49 #include <sys/proc.h>
   50 #include <sys/resource.h>
   51 #include <sys/resourcevar.h>
   52 #include <sys/syscallsubr.h>
   53 #include <sys/sysproto.h>
   54 #include <sys/systm.h>
   55 #include <sys/unistd.h>
   56 #include <sys/wait.h>
   57 
   58 #include <machine/frame.h>
   59 #include <machine/pcb.h>
   60 #include <machine/psl.h>
   61 #include <machine/segments.h>
   62 #include <machine/specialreg.h>
   63 
   64 #include <vm/pmap.h>
   65 #include <vm/vm.h>
   66 #include <vm/vm_map.h>
   67 
   68 #include <compat/freebsd32/freebsd32_util.h>
   69 #include <amd64/linux32/linux.h>
   70 #include <amd64/linux32/linux32_proto.h>
   71 #include <compat/linux/linux_emul.h>
   72 #include <compat/linux/linux_ipc.h>
   73 #include <compat/linux/linux_misc.h>
   74 #include <compat/linux/linux_mmap.h>
   75 #include <compat/linux/linux_signal.h>
   76 #include <compat/linux/linux_util.h>
   77 
   78 static void     bsd_to_linux_rusage(struct rusage *ru, struct l_rusage *lru);
   79 
   80 struct l_old_select_argv {
   81         l_int           nfds;
   82         l_uintptr_t     readfds;
   83         l_uintptr_t     writefds;
   84         l_uintptr_t     exceptfds;
   85         l_uintptr_t     timeout;
   86 } __packed;
   87 
   88 
   89 static void
   90 bsd_to_linux_rusage(struct rusage *ru, struct l_rusage *lru)
   91 {
   92 
   93         lru->ru_utime.tv_sec = ru->ru_utime.tv_sec;
   94         lru->ru_utime.tv_usec = ru->ru_utime.tv_usec;
   95         lru->ru_stime.tv_sec = ru->ru_stime.tv_sec;
   96         lru->ru_stime.tv_usec = ru->ru_stime.tv_usec;
   97         lru->ru_maxrss = ru->ru_maxrss;
   98         lru->ru_ixrss = ru->ru_ixrss;
   99         lru->ru_idrss = ru->ru_idrss;
  100         lru->ru_isrss = ru->ru_isrss;
  101         lru->ru_minflt = ru->ru_minflt;
  102         lru->ru_majflt = ru->ru_majflt;
  103         lru->ru_nswap = ru->ru_nswap;
  104         lru->ru_inblock = ru->ru_inblock;
  105         lru->ru_oublock = ru->ru_oublock;
  106         lru->ru_msgsnd = ru->ru_msgsnd;
  107         lru->ru_msgrcv = ru->ru_msgrcv;
  108         lru->ru_nsignals = ru->ru_nsignals;
  109         lru->ru_nvcsw = ru->ru_nvcsw;
  110         lru->ru_nivcsw = ru->ru_nivcsw;
  111 }
  112 
  113 int
  114 linux_copyout_rusage(struct rusage *ru, void *uaddr)
  115 {
  116         struct l_rusage lru;
  117 
  118         bsd_to_linux_rusage(ru, &lru);
  119 
  120         return (copyout(&lru, uaddr, sizeof(struct l_rusage)));
  121 }
  122 
  123 int
  124 linux_execve(struct thread *td, struct linux_execve_args *args)
  125 {
  126         struct image_args eargs;
  127         char *path;
  128         int error;
  129 
  130         LCONVPATHEXIST(td, args->path, &path);
  131 
  132 #ifdef DEBUG
  133         if (ldebug(execve))
  134                 printf(ARGS(execve, "%s"), path);
  135 #endif
  136 
  137         error = freebsd32_exec_copyin_args(&eargs, path, UIO_SYSSPACE,
  138             args->argp, args->envp);
  139         free(path, M_TEMP);
  140         if (error == 0)
  141                 error = linux_common_execve(td, &eargs);
  142         return (error);
  143 }
  144 
  145 CTASSERT(sizeof(struct l_iovec32) == 8);
  146 
  147 int
  148 linux32_copyinuio(struct l_iovec32 *iovp, l_ulong iovcnt, struct uio **uiop)
  149 {
  150         struct l_iovec32 iov32;
  151         struct iovec *iov;
  152         struct uio *uio;
  153         uint32_t iovlen;
  154         int error, i;
  155 
  156         *uiop = NULL;
  157         if (iovcnt > UIO_MAXIOV)
  158                 return (EINVAL);
  159         iovlen = iovcnt * sizeof(struct iovec);
  160         uio = malloc(iovlen + sizeof(*uio), M_IOV, M_WAITOK);
  161         iov = (struct iovec *)(uio + 1);
  162         for (i = 0; i < iovcnt; i++) {
  163                 error = copyin(&iovp[i], &iov32, sizeof(struct l_iovec32));
  164                 if (error) {
  165                         free(uio, M_IOV);
  166                         return (error);
  167                 }
  168                 iov[i].iov_base = PTRIN(iov32.iov_base);
  169                 iov[i].iov_len = iov32.iov_len;
  170         }
  171         uio->uio_iov = iov;
  172         uio->uio_iovcnt = iovcnt;
  173         uio->uio_segflg = UIO_USERSPACE;
  174         uio->uio_offset = -1;
  175         uio->uio_resid = 0;
  176         for (i = 0; i < iovcnt; i++) {
  177                 if (iov->iov_len > INT_MAX - uio->uio_resid) {
  178                         free(uio, M_IOV);
  179                         return (EINVAL);
  180                 }
  181                 uio->uio_resid += iov->iov_len;
  182                 iov++;
  183         }
  184         *uiop = uio;
  185         return (0);
  186 }
  187 
  188 int
  189 linux32_copyiniov(struct l_iovec32 *iovp32, l_ulong iovcnt, struct iovec **iovp,
  190     int error)
  191 {
  192         struct l_iovec32 iov32;
  193         struct iovec *iov;
  194         uint32_t iovlen;
  195         int i;
  196 
  197         *iovp = NULL;
  198         if (iovcnt > UIO_MAXIOV)
  199                 return (error);
  200         iovlen = iovcnt * sizeof(struct iovec);
  201         iov = malloc(iovlen, M_IOV, M_WAITOK);
  202         for (i = 0; i < iovcnt; i++) {
  203                 error = copyin(&iovp32[i], &iov32, sizeof(struct l_iovec32));
  204                 if (error) {
  205                         free(iov, M_IOV);
  206                         return (error);
  207                 }
  208                 iov[i].iov_base = PTRIN(iov32.iov_base);
  209                 iov[i].iov_len = iov32.iov_len;
  210         }
  211         *iovp = iov;
  212         return(0);
  213 
  214 }
  215 
  216 int
  217 linux_readv(struct thread *td, struct linux_readv_args *uap)
  218 {
  219         struct uio *auio;
  220         int error;
  221 
  222         error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
  223         if (error)
  224                 return (error);
  225         error = kern_readv(td, uap->fd, auio);
  226         free(auio, M_IOV);
  227         return (error);
  228 }
  229 
  230 int
  231 linux_writev(struct thread *td, struct linux_writev_args *uap)
  232 {
  233         struct uio *auio;
  234         int error;
  235 
  236         error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
  237         if (error)
  238                 return (error);
  239         error = kern_writev(td, uap->fd, auio);
  240         free(auio, M_IOV);
  241         return (error);
  242 }
  243 
  244 struct l_ipc_kludge {
  245         l_uintptr_t msgp;
  246         l_long msgtyp;
  247 } __packed;
  248 
  249 int
  250 linux_ipc(struct thread *td, struct linux_ipc_args *args)
  251 {
  252 
  253         switch (args->what & 0xFFFF) {
  254         case LINUX_SEMOP: {
  255                 struct linux_semop_args a;
  256 
  257                 a.semid = args->arg1;
  258                 a.tsops = PTRIN(args->ptr);
  259                 a.nsops = args->arg2;
  260                 return (linux_semop(td, &a));
  261         }
  262         case LINUX_SEMGET: {
  263                 struct linux_semget_args a;
  264 
  265                 a.key = args->arg1;
  266                 a.nsems = args->arg2;
  267                 a.semflg = args->arg3;
  268                 return (linux_semget(td, &a));
  269         }
  270         case LINUX_SEMCTL: {
  271                 struct linux_semctl_args a;
  272                 int error;
  273 
  274                 a.semid = args->arg1;
  275                 a.semnum = args->arg2;
  276                 a.cmd = args->arg3;
  277                 error = copyin(PTRIN(args->ptr), &a.arg, sizeof(a.arg));
  278                 if (error)
  279                         return (error);
  280                 return (linux_semctl(td, &a));
  281         }
  282         case LINUX_MSGSND: {
  283                 struct linux_msgsnd_args a;
  284 
  285                 a.msqid = args->arg1;
  286                 a.msgp = PTRIN(args->ptr);
  287                 a.msgsz = args->arg2;
  288                 a.msgflg = args->arg3;
  289                 return (linux_msgsnd(td, &a));
  290         }
  291         case LINUX_MSGRCV: {
  292                 struct linux_msgrcv_args a;
  293 
  294                 a.msqid = args->arg1;
  295                 a.msgsz = args->arg2;
  296                 a.msgflg = args->arg3;
  297                 if ((args->what >> 16) == 0) {
  298                         struct l_ipc_kludge tmp;
  299                         int error;
  300 
  301                         if (args->ptr == 0)
  302                                 return (EINVAL);
  303                         error = copyin(PTRIN(args->ptr), &tmp, sizeof(tmp));
  304                         if (error)
  305                                 return (error);
  306                         a.msgp = PTRIN(tmp.msgp);
  307                         a.msgtyp = tmp.msgtyp;
  308                 } else {
  309                         a.msgp = PTRIN(args->ptr);
  310                         a.msgtyp = args->arg5;
  311                 }
  312                 return (linux_msgrcv(td, &a));
  313         }
  314         case LINUX_MSGGET: {
  315                 struct linux_msgget_args a;
  316 
  317                 a.key = args->arg1;
  318                 a.msgflg = args->arg2;
  319                 return (linux_msgget(td, &a));
  320         }
  321         case LINUX_MSGCTL: {
  322                 struct linux_msgctl_args a;
  323 
  324                 a.msqid = args->arg1;
  325                 a.cmd = args->arg2;
  326                 a.buf = PTRIN(args->ptr);
  327                 return (linux_msgctl(td, &a));
  328         }
  329         case LINUX_SHMAT: {
  330                 struct linux_shmat_args a;
  331                 l_uintptr_t addr;
  332                 int error;
  333 
  334                 a.shmid = args->arg1;
  335                 a.shmaddr = PTRIN(args->ptr);
  336                 a.shmflg = args->arg2;
  337                 error = linux_shmat(td, &a);
  338                 if (error != 0)
  339                         return (error);
  340                 addr = td->td_retval[0];
  341                 error = copyout(&addr, PTRIN(args->arg3), sizeof(addr));
  342                 td->td_retval[0] = 0;
  343                 return (error);
  344         }
  345         case LINUX_SHMDT: {
  346                 struct linux_shmdt_args a;
  347 
  348                 a.shmaddr = PTRIN(args->ptr);
  349                 return (linux_shmdt(td, &a));
  350         }
  351         case LINUX_SHMGET: {
  352                 struct linux_shmget_args a;
  353 
  354                 a.key = args->arg1;
  355                 a.size = args->arg2;
  356                 a.shmflg = args->arg3;
  357                 return (linux_shmget(td, &a));
  358         }
  359         case LINUX_SHMCTL: {
  360                 struct linux_shmctl_args a;
  361 
  362                 a.shmid = args->arg1;
  363                 a.cmd = args->arg2;
  364                 a.buf = PTRIN(args->ptr);
  365                 return (linux_shmctl(td, &a));
  366         }
  367         default:
  368                 break;
  369         }
  370 
  371         return (EINVAL);
  372 }
  373 
  374 int
  375 linux_old_select(struct thread *td, struct linux_old_select_args *args)
  376 {
  377         struct l_old_select_argv linux_args;
  378         struct linux_select_args newsel;
  379         int error;
  380 
  381 #ifdef DEBUG
  382         if (ldebug(old_select))
  383                 printf(ARGS(old_select, "%p"), args->ptr);
  384 #endif
  385 
  386         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  387         if (error)
  388                 return (error);
  389 
  390         newsel.nfds = linux_args.nfds;
  391         newsel.readfds = PTRIN(linux_args.readfds);
  392         newsel.writefds = PTRIN(linux_args.writefds);
  393         newsel.exceptfds = PTRIN(linux_args.exceptfds);
  394         newsel.timeout = PTRIN(linux_args.timeout);
  395         return (linux_select(td, &newsel));
  396 }
  397 
  398 int
  399 linux_set_cloned_tls(struct thread *td, void *desc)
  400 {
  401         struct user_segment_descriptor sd;
  402         struct l_user_desc info;
  403         struct pcb *pcb;
  404         int error;
  405         int a[2];
  406 
  407         error = copyin(desc, &info, sizeof(struct l_user_desc));
  408         if (error) {
  409                 printf(LMSG("copyin failed!"));
  410         } else {
  411                 /* We might copy out the entry_number as GUGS32_SEL. */
  412                 info.entry_number = GUGS32_SEL;
  413                 error = copyout(&info, desc, sizeof(struct l_user_desc));
  414                 if (error)
  415                         printf(LMSG("copyout failed!"));
  416 
  417                 a[0] = LINUX_LDT_entry_a(&info);
  418                 a[1] = LINUX_LDT_entry_b(&info);
  419 
  420                 memcpy(&sd, &a, sizeof(a));
  421 #ifdef DEBUG
  422                 if (ldebug(clone))
  423                         printf("Segment created in clone with "
  424                             "CLONE_SETTLS: lobase: %x, hibase: %x, "
  425                             "lolimit: %x, hilimit: %x, type: %i, "
  426                             "dpl: %i, p: %i, xx: %i, long: %i, "
  427                             "def32: %i, gran: %i\n", sd.sd_lobase,
  428                             sd.sd_hibase, sd.sd_lolimit, sd.sd_hilimit,
  429                             sd.sd_type, sd.sd_dpl, sd.sd_p, sd.sd_xx,
  430                             sd.sd_long, sd.sd_def32, sd.sd_gran);
  431 #endif
  432                 pcb = td->td_pcb;
  433                 pcb->pcb_gsbase = (register_t)info.base_addr;
  434                 td->td_frame->tf_gs = GSEL(GUGS32_SEL, SEL_UPL);
  435                 set_pcb_flags(pcb, PCB_32BIT);
  436         }
  437 
  438         return (error);
  439 }
  440 
  441 int
  442 linux_set_upcall_kse(struct thread *td, register_t stack)
  443 {
  444 
  445         if (stack)
  446                 td->td_frame->tf_rsp = stack;
  447 
  448         /*
  449          * The newly created Linux thread returns
  450          * to the user space by the same path that a parent do.
  451          */
  452         td->td_frame->tf_rax = 0;
  453         return (0);
  454 }
  455 
  456 int
  457 linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
  458 {
  459 
  460 #ifdef DEBUG
  461         if (ldebug(mmap2))
  462                 printf(ARGS(mmap2, "0x%08x, %d, %d, 0x%08x, %d, %d"),
  463                     args->addr, args->len, args->prot,
  464                     args->flags, args->fd, args->pgoff);
  465 #endif
  466 
  467         return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
  468                 args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
  469                 PAGE_SIZE));
  470 }
  471 
  472 int
  473 linux_mmap(struct thread *td, struct linux_mmap_args *args)
  474 {
  475         int error;
  476         struct l_mmap_argv linux_args;
  477 
  478         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  479         if (error)
  480                 return (error);
  481 
  482 #ifdef DEBUG
  483         if (ldebug(mmap))
  484                 printf(ARGS(mmap, "0x%08x, %d, %d, 0x%08x, %d, %d"),
  485                     linux_args.addr, linux_args.len, linux_args.prot,
  486                     linux_args.flags, linux_args.fd, linux_args.pgoff);
  487 #endif
  488 
  489         return (linux_mmap_common(td, linux_args.addr, linux_args.len,
  490             linux_args.prot, linux_args.flags, linux_args.fd,
  491             (uint32_t)linux_args.pgoff));
  492 }
  493 
  494 int
  495 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
  496 {
  497 
  498         return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot));
  499 }
  500 
  501 int
  502 linux_iopl(struct thread *td, struct linux_iopl_args *args)
  503 {
  504         int error;
  505 
  506         if (args->level < 0 || args->level > 3)
  507                 return (EINVAL);
  508         if ((error = priv_check(td, PRIV_IO)) != 0)
  509                 return (error);
  510         if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
  511                 return (error);
  512         td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) |
  513             (args->level * (PSL_IOPL / 3));
  514 
  515         return (0);
  516 }
  517 
  518 int
  519 linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
  520 {
  521         l_osigaction_t osa;
  522         l_sigaction_t act, oact;
  523         int error;
  524 
  525 #ifdef DEBUG
  526         if (ldebug(sigaction))
  527                 printf(ARGS(sigaction, "%d, %p, %p"),
  528                     args->sig, (void *)args->nsa, (void *)args->osa);
  529 #endif
  530 
  531         if (args->nsa != NULL) {
  532                 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
  533                 if (error)
  534                         return (error);
  535                 act.lsa_handler = osa.lsa_handler;
  536                 act.lsa_flags = osa.lsa_flags;
  537                 act.lsa_restorer = osa.lsa_restorer;
  538                 LINUX_SIGEMPTYSET(act.lsa_mask);
  539                 act.lsa_mask.__mask = osa.lsa_mask;
  540         }
  541 
  542         error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
  543             args->osa ? &oact : NULL);
  544 
  545         if (args->osa != NULL && !error) {
  546                 osa.lsa_handler = oact.lsa_handler;
  547                 osa.lsa_flags = oact.lsa_flags;
  548                 osa.lsa_restorer = oact.lsa_restorer;
  549                 osa.lsa_mask = oact.lsa_mask.__mask;
  550                 error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
  551         }
  552 
  553         return (error);
  554 }
  555 
  556 /*
  557  * Linux has two extra args, restart and oldmask.  We don't use these,
  558  * but it seems that "restart" is actually a context pointer that
  559  * enables the signal to happen with a different register set.
  560  */
  561 int
  562 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
  563 {
  564         sigset_t sigmask;
  565         l_sigset_t mask;
  566 
  567 #ifdef DEBUG
  568         if (ldebug(sigsuspend))
  569                 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask);
  570 #endif
  571 
  572         LINUX_SIGEMPTYSET(mask);
  573         mask.__mask = args->mask;
  574         linux_to_bsd_sigset(&mask, &sigmask);
  575         return (kern_sigsuspend(td, sigmask));
  576 }
  577 
  578 int
  579 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
  580 {
  581         l_sigset_t lmask;
  582         sigset_t sigmask;
  583         int error;
  584 
  585 #ifdef DEBUG
  586         if (ldebug(rt_sigsuspend))
  587                 printf(ARGS(rt_sigsuspend, "%p, %d"),
  588                     (void *)uap->newset, uap->sigsetsize);
  589 #endif
  590 
  591         if (uap->sigsetsize != sizeof(l_sigset_t))
  592                 return (EINVAL);
  593 
  594         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
  595         if (error)
  596                 return (error);
  597 
  598         linux_to_bsd_sigset(&lmask, &sigmask);
  599         return (kern_sigsuspend(td, sigmask));
  600 }
  601 
  602 int
  603 linux_pause(struct thread *td, struct linux_pause_args *args)
  604 {
  605         struct proc *p = td->td_proc;
  606         sigset_t sigmask;
  607 
  608 #ifdef DEBUG
  609         if (ldebug(pause))
  610                 printf(ARGS(pause, ""));
  611 #endif
  612 
  613         PROC_LOCK(p);
  614         sigmask = td->td_sigmask;
  615         PROC_UNLOCK(p);
  616         return (kern_sigsuspend(td, sigmask));
  617 }
  618 
  619 int
  620 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
  621 {
  622         stack_t ss, oss;
  623         l_stack_t lss;
  624         int error;
  625 
  626 #ifdef DEBUG
  627         if (ldebug(sigaltstack))
  628                 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss);
  629 #endif
  630 
  631         if (uap->uss != NULL) {
  632                 error = copyin(uap->uss, &lss, sizeof(l_stack_t));
  633                 if (error)
  634                         return (error);
  635 
  636                 ss.ss_sp = PTRIN(lss.ss_sp);
  637                 ss.ss_size = lss.ss_size;
  638                 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
  639         }
  640         error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
  641             (uap->uoss != NULL) ? &oss : NULL);
  642         if (!error && uap->uoss != NULL) {
  643                 lss.ss_sp = PTROUT(oss.ss_sp);
  644                 lss.ss_size = oss.ss_size;
  645                 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
  646                 error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
  647         }
  648 
  649         return (error);
  650 }
  651 
  652 int
  653 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
  654 {
  655 
  656 #ifdef DEBUG
  657         if (ldebug(ftruncate64))
  658                 printf(ARGS(ftruncate64, "%u, %jd"), args->fd,
  659                     (intmax_t)args->length);
  660 #endif
  661 
  662         return (kern_ftruncate(td, args->fd, args->length));
  663 }
  664 
  665 int
  666 linux_gettimeofday(struct thread *td, struct linux_gettimeofday_args *uap)
  667 {
  668         struct timeval atv;
  669         l_timeval atv32;
  670         struct timezone rtz;
  671         int error = 0;
  672 
  673         if (uap->tp) {
  674                 microtime(&atv);
  675                 atv32.tv_sec = atv.tv_sec;
  676                 atv32.tv_usec = atv.tv_usec;
  677                 error = copyout(&atv32, uap->tp, sizeof(atv32));
  678         }
  679         if (error == 0 && uap->tzp != NULL) {
  680                 rtz.tz_minuteswest = tz_minuteswest;
  681                 rtz.tz_dsttime = tz_dsttime;
  682                 error = copyout(&rtz, uap->tzp, sizeof(rtz));
  683         }
  684         return (error);
  685 }
  686 
  687 int
  688 linux_settimeofday(struct thread *td, struct linux_settimeofday_args *uap)
  689 {
  690         l_timeval atv32;
  691         struct timeval atv, *tvp;
  692         struct timezone atz, *tzp;
  693         int error;
  694 
  695         if (uap->tp) {
  696                 error = copyin(uap->tp, &atv32, sizeof(atv32));
  697                 if (error)
  698                         return (error);
  699                 atv.tv_sec = atv32.tv_sec;
  700                 atv.tv_usec = atv32.tv_usec;
  701                 tvp = &atv;
  702         } else
  703                 tvp = NULL;
  704         if (uap->tzp) {
  705                 error = copyin(uap->tzp, &atz, sizeof(atz));
  706                 if (error)
  707                         return (error);
  708                 tzp = &atz;
  709         } else
  710                 tzp = NULL;
  711         return (kern_settimeofday(td, tvp, tzp));
  712 }
  713 
  714 int
  715 linux_getrusage(struct thread *td, struct linux_getrusage_args *uap)
  716 {
  717         struct rusage s;
  718         int error;
  719 
  720         error = kern_getrusage(td, uap->who, &s);
  721         if (error != 0)
  722                 return (error);
  723         if (uap->rusage != NULL)
  724                 error = linux_copyout_rusage(&s, uap->rusage);
  725         return (error);
  726 }
  727 
  728 int
  729 linux_set_thread_area(struct thread *td,
  730     struct linux_set_thread_area_args *args)
  731 {
  732         struct l_user_desc info;
  733         struct user_segment_descriptor sd;
  734         struct pcb *pcb;
  735         int a[2];
  736         int error;
  737 
  738         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
  739         if (error)
  740                 return (error);
  741 
  742 #ifdef DEBUG
  743         if (ldebug(set_thread_area))
  744                 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, "
  745                     "%i, %i, %i"), info.entry_number, info.base_addr,
  746                     info.limit, info.seg_32bit, info.contents,
  747                     info.read_exec_only, info.limit_in_pages,
  748                     info.seg_not_present, info.useable);
  749 #endif
  750 
  751         /*
  752          * Semantics of Linux version: every thread in the system has array
  753          * of three TLS descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown.
  754          * This syscall loads one of the selected TLS decriptors with a value
  755          * and also loads GDT descriptors 6, 7 and 8 with the content of
  756          * the per-thread descriptors.
  757          *
  758          * Semantics of FreeBSD version: I think we can ignore that Linux has
  759          * three per-thread descriptors and use just the first one.
  760          * The tls_array[] is used only in [gs]et_thread_area() syscalls and
  761          * for loading the GDT descriptors. We use just one GDT descriptor
  762          * for TLS, so we will load just one.
  763          *
  764          * XXX: This doesn't work when a user space process tries to use more
  765          * than one TLS segment. Comment in the Linux source says wine might
  766          * do this.
  767          */
  768 
  769         /*
  770          * GLIBC reads current %gs and call set_thread_area() with it.
  771          * We should let GUDATA_SEL and GUGS32_SEL proceed as well because
  772          * we use these segments.
  773          */
  774         switch (info.entry_number) {
  775         case GUGS32_SEL:
  776         case GUDATA_SEL:
  777         case 6:
  778         case -1:
  779                 info.entry_number = GUGS32_SEL;
  780                 break;
  781         default:
  782                 return (EINVAL);
  783         }
  784 
  785         /*
  786          * We have to copy out the GDT entry we use.
  787          *
  788          * XXX: What if a user space program does not check the return value
  789          * and tries to use 6, 7 or 8?
  790          */
  791         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
  792         if (error)
  793                 return (error);
  794 
  795         if (LINUX_LDT_empty(&info)) {
  796                 a[0] = 0;
  797                 a[1] = 0;
  798         } else {
  799                 a[0] = LINUX_LDT_entry_a(&info);
  800                 a[1] = LINUX_LDT_entry_b(&info);
  801         }
  802 
  803         memcpy(&sd, &a, sizeof(a));
  804 #ifdef DEBUG
  805         if (ldebug(set_thread_area))
  806                 printf("Segment created in set_thread_area: "
  807                     "lobase: %x, hibase: %x, lolimit: %x, hilimit: %x, "
  808                     "type: %i, dpl: %i, p: %i, xx: %i, long: %i, "
  809                     "def32: %i, gran: %i\n",
  810                     sd.sd_lobase,
  811                     sd.sd_hibase,
  812                     sd.sd_lolimit,
  813                     sd.sd_hilimit,
  814                     sd.sd_type,
  815                     sd.sd_dpl,
  816                     sd.sd_p,
  817                     sd.sd_xx,
  818                     sd.sd_long,
  819                     sd.sd_def32,
  820                     sd.sd_gran);
  821 #endif
  822 
  823         pcb = td->td_pcb;
  824         pcb->pcb_gsbase = (register_t)info.base_addr;
  825         set_pcb_flags(pcb, PCB_32BIT);
  826         update_gdt_gsbase(td, info.base_addr);
  827 
  828         return (0);
  829 }

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