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: releng/10.1/sys/i386/linux/linux_machdep.c 272020 2014-09-23 07:50:04Z 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         cap_rights_t rights;
  426 
  427         error = 0;
  428         bsd_args.flags = 0;
  429         fp = NULL;
  430 
  431         /*
  432          * Linux mmap(2):
  433          * You must specify exactly one of MAP_SHARED and MAP_PRIVATE
  434          */
  435         if (!((flags & LINUX_MAP_SHARED) ^ (flags & LINUX_MAP_PRIVATE)))
  436                 return (EINVAL);
  437 
  438         if (flags & LINUX_MAP_SHARED)
  439                 bsd_args.flags |= MAP_SHARED;
  440         if (flags & LINUX_MAP_PRIVATE)
  441                 bsd_args.flags |= MAP_PRIVATE;
  442         if (flags & LINUX_MAP_FIXED)
  443                 bsd_args.flags |= MAP_FIXED;
  444         if (flags & LINUX_MAP_ANON) {
  445                 /* Enforce pos to be on page boundary, then ignore. */
  446                 if ((pos & PAGE_MASK) != 0)
  447                         return (EINVAL);
  448                 pos = 0;
  449                 bsd_args.flags |= MAP_ANON;
  450         } else
  451                 bsd_args.flags |= MAP_NOSYNC;
  452         if (flags & LINUX_MAP_GROWSDOWN)
  453                 bsd_args.flags |= MAP_STACK;
  454 
  455         /*
  456          * PROT_READ, PROT_WRITE, or PROT_EXEC implies PROT_READ and PROT_EXEC
  457          * on Linux/i386. We do this to ensure maximum compatibility.
  458          * Linux/ia64 does the same in i386 emulation mode.
  459          */
  460         bsd_args.prot = prot;
  461         if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
  462                 bsd_args.prot |= PROT_READ | PROT_EXEC;
  463 
  464         /* Linux does not check file descriptor when MAP_ANONYMOUS is set. */
  465         bsd_args.fd = (bsd_args.flags & MAP_ANON) ? -1 : fd;
  466         if (bsd_args.fd != -1) {
  467                 /*
  468                  * Linux follows Solaris mmap(2) description:
  469                  * The file descriptor fildes is opened with
  470                  * read permission, regardless of the
  471                  * protection options specified.
  472                  *
  473                  * Checking just CAP_MMAP is fine here, since the real work
  474                  * is done in the FreeBSD mmap().
  475                  */
  476 
  477                 error = fget(td, bsd_args.fd,
  478                     cap_rights_init(&rights, CAP_MMAP), &fp);
  479                 if (error != 0)
  480                         return (error);
  481                 if (fp->f_type != DTYPE_VNODE) {
  482                         fdrop(fp, td);
  483                         return (EINVAL);
  484                 }
  485 
  486                 /* Linux mmap() just fails for O_WRONLY files */
  487                 if (!(fp->f_flag & FREAD)) {
  488                         fdrop(fp, td);
  489                         return (EACCES);
  490                 }
  491 
  492                 fdrop(fp, td);
  493         }
  494 
  495         if (flags & LINUX_MAP_GROWSDOWN) {
  496                 /* 
  497                  * The Linux MAP_GROWSDOWN option does not limit auto
  498                  * growth of the region.  Linux mmap with this option
  499                  * takes as addr the inital BOS, and as len, the initial
  500                  * region size.  It can then grow down from addr without
  501                  * limit.  However, linux threads has an implicit internal
  502                  * limit to stack size of STACK_SIZE.  Its just not
  503                  * enforced explicitly in linux.  But, here we impose
  504                  * a limit of (STACK_SIZE - GUARD_SIZE) on the stack
  505                  * region, since we can do this with our mmap.
  506                  *
  507                  * Our mmap with MAP_STACK takes addr as the maximum
  508                  * downsize limit on BOS, and as len the max size of
  509                  * the region.  It them maps the top SGROWSIZ bytes,
  510                  * and auto grows the region down, up to the limit
  511                  * in addr.
  512                  *
  513                  * If we don't use the MAP_STACK option, the effect
  514                  * of this code is to allocate a stack region of a
  515                  * fixed size of (STACK_SIZE - GUARD_SIZE).
  516                  */
  517 
  518                 if ((caddr_t)PTRIN(addr) + len > p->p_vmspace->vm_maxsaddr) {
  519                         /* 
  520                          * Some linux apps will attempt to mmap
  521                          * thread stacks near the top of their
  522                          * address space.  If their TOS is greater
  523                          * than vm_maxsaddr, vm_map_growstack()
  524                          * will confuse the thread stack with the
  525                          * process stack and deliver a SEGV if they
  526                          * attempt to grow the thread stack past their
  527                          * current stacksize rlimit.  To avoid this,
  528                          * adjust vm_maxsaddr upwards to reflect
  529                          * the current stacksize rlimit rather
  530                          * than the maximum possible stacksize.
  531                          * It would be better to adjust the
  532                          * mmap'ed region, but some apps do not check
  533                          * mmap's return value.
  534                          */
  535                         PROC_LOCK(p);
  536                         p->p_vmspace->vm_maxsaddr = (char *)USRSTACK -
  537                             lim_cur(p, RLIMIT_STACK);
  538                         PROC_UNLOCK(p);
  539                 }
  540 
  541                 /*
  542                  * This gives us our maximum stack size and a new BOS.
  543                  * If we're using VM_STACK, then mmap will just map
  544                  * the top SGROWSIZ bytes, and let the stack grow down
  545                  * to the limit at BOS.  If we're not using VM_STACK
  546                  * we map the full stack, since we don't have a way
  547                  * to autogrow it.
  548                  */
  549                 if (len > STACK_SIZE - GUARD_SIZE) {
  550                         bsd_args.addr = (caddr_t)PTRIN(addr);
  551                         bsd_args.len = len;
  552                 } else {
  553                         bsd_args.addr = (caddr_t)PTRIN(addr) -
  554                             (STACK_SIZE - GUARD_SIZE - len);
  555                         bsd_args.len = STACK_SIZE - GUARD_SIZE;
  556                 }
  557         } else {
  558                 bsd_args.addr = (caddr_t)PTRIN(addr);
  559                 bsd_args.len  = len;
  560         }
  561         bsd_args.pos = pos;
  562 
  563 #ifdef DEBUG
  564         if (ldebug(mmap))
  565                 printf("-> %s(%p, %d, %d, 0x%08x, %d, 0x%x)\n",
  566                     __func__,
  567                     (void *)bsd_args.addr, bsd_args.len, bsd_args.prot,
  568                     bsd_args.flags, bsd_args.fd, (int)bsd_args.pos);
  569 #endif
  570         error = sys_mmap(td, &bsd_args);
  571 #ifdef DEBUG
  572         if (ldebug(mmap))
  573                 printf("-> %s() return: 0x%x (0x%08x)\n",
  574                         __func__, error, (u_int)td->td_retval[0]);
  575 #endif
  576         return (error);
  577 }
  578 
  579 int
  580 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
  581 {
  582         struct mprotect_args bsd_args;
  583 
  584         bsd_args.addr = uap->addr;
  585         bsd_args.len = uap->len;
  586         bsd_args.prot = uap->prot;
  587         if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
  588                 bsd_args.prot |= PROT_READ | PROT_EXEC;
  589         return (sys_mprotect(td, &bsd_args));
  590 }
  591 
  592 int
  593 linux_ioperm(struct thread *td, struct linux_ioperm_args *args)
  594 {
  595         int error;
  596         struct i386_ioperm_args iia;
  597 
  598         iia.start = args->start;
  599         iia.length = args->length;
  600         iia.enable = args->enable;
  601         error = i386_set_ioperm(td, &iia);
  602         return (error);
  603 }
  604 
  605 int
  606 linux_iopl(struct thread *td, struct linux_iopl_args *args)
  607 {
  608         int error;
  609 
  610         if (args->level < 0 || args->level > 3)
  611                 return (EINVAL);
  612         if ((error = priv_check(td, PRIV_IO)) != 0)
  613                 return (error);
  614         if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
  615                 return (error);
  616         td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) |
  617             (args->level * (PSL_IOPL / 3));
  618         return (0);
  619 }
  620 
  621 int
  622 linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap)
  623 {
  624         int error;
  625         struct i386_ldt_args ldt;
  626         struct l_descriptor ld;
  627         union descriptor desc;
  628         int size, written;
  629 
  630         switch (uap->func) {
  631         case 0x00: /* read_ldt */
  632                 ldt.start = 0;
  633                 ldt.descs = uap->ptr;
  634                 ldt.num = uap->bytecount / sizeof(union descriptor);
  635                 error = i386_get_ldt(td, &ldt);
  636                 td->td_retval[0] *= sizeof(union descriptor);
  637                 break;
  638         case 0x02: /* read_default_ldt = 0 */
  639                 size = 5*sizeof(struct l_desc_struct);
  640                 if (size > uap->bytecount)
  641                         size = uap->bytecount;
  642                 for (written = error = 0; written < size && error == 0; written++)
  643                         error = subyte((char *)uap->ptr + written, 0);
  644                 td->td_retval[0] = written;
  645                 break;
  646         case 0x01: /* write_ldt */
  647         case 0x11: /* write_ldt */
  648                 if (uap->bytecount != sizeof(ld))
  649                         return (EINVAL);
  650 
  651                 error = copyin(uap->ptr, &ld, sizeof(ld));
  652                 if (error)
  653                         return (error);
  654 
  655                 ldt.start = ld.entry_number;
  656                 ldt.descs = &desc;
  657                 ldt.num = 1;
  658                 desc.sd.sd_lolimit = (ld.limit & 0x0000ffff);
  659                 desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16;
  660                 desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff);
  661                 desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24;
  662                 desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) |
  663                         (ld.contents << 2);
  664                 desc.sd.sd_dpl = 3;
  665                 desc.sd.sd_p = (ld.seg_not_present ^ 1);
  666                 desc.sd.sd_xx = 0;
  667                 desc.sd.sd_def32 = ld.seg_32bit;
  668                 desc.sd.sd_gran = ld.limit_in_pages;
  669                 error = i386_set_ldt(td, &ldt, &desc);
  670                 break;
  671         default:
  672                 error = ENOSYS;
  673                 break;
  674         }
  675 
  676         if (error == EOPNOTSUPP) {
  677                 printf("linux: modify_ldt needs kernel option USER_LDT\n");
  678                 error = ENOSYS;
  679         }
  680 
  681         return (error);
  682 }
  683 
  684 int
  685 linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
  686 {
  687         l_osigaction_t osa;
  688         l_sigaction_t act, oact;
  689         int error;
  690 
  691 #ifdef DEBUG
  692         if (ldebug(sigaction))
  693                 printf(ARGS(sigaction, "%d, %p, %p"),
  694                     args->sig, (void *)args->nsa, (void *)args->osa);
  695 #endif
  696 
  697         if (args->nsa != NULL) {
  698                 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
  699                 if (error)
  700                         return (error);
  701                 act.lsa_handler = osa.lsa_handler;
  702                 act.lsa_flags = osa.lsa_flags;
  703                 act.lsa_restorer = osa.lsa_restorer;
  704                 LINUX_SIGEMPTYSET(act.lsa_mask);
  705                 act.lsa_mask.__bits[0] = osa.lsa_mask;
  706         }
  707 
  708         error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
  709             args->osa ? &oact : NULL);
  710 
  711         if (args->osa != NULL && !error) {
  712                 osa.lsa_handler = oact.lsa_handler;
  713                 osa.lsa_flags = oact.lsa_flags;
  714                 osa.lsa_restorer = oact.lsa_restorer;
  715                 osa.lsa_mask = oact.lsa_mask.__bits[0];
  716                 error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
  717         }
  718 
  719         return (error);
  720 }
  721 
  722 /*
  723  * Linux has two extra args, restart and oldmask.  We dont use these,
  724  * but it seems that "restart" is actually a context pointer that
  725  * enables the signal to happen with a different register set.
  726  */
  727 int
  728 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
  729 {
  730         sigset_t sigmask;
  731         l_sigset_t mask;
  732 
  733 #ifdef DEBUG
  734         if (ldebug(sigsuspend))
  735                 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask);
  736 #endif
  737 
  738         LINUX_SIGEMPTYSET(mask);
  739         mask.__bits[0] = args->mask;
  740         linux_to_bsd_sigset(&mask, &sigmask);
  741         return (kern_sigsuspend(td, sigmask));
  742 }
  743 
  744 int
  745 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
  746 {
  747         l_sigset_t lmask;
  748         sigset_t sigmask;
  749         int error;
  750 
  751 #ifdef DEBUG
  752         if (ldebug(rt_sigsuspend))
  753                 printf(ARGS(rt_sigsuspend, "%p, %d"),
  754                     (void *)uap->newset, uap->sigsetsize);
  755 #endif
  756 
  757         if (uap->sigsetsize != sizeof(l_sigset_t))
  758                 return (EINVAL);
  759 
  760         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
  761         if (error)
  762                 return (error);
  763 
  764         linux_to_bsd_sigset(&lmask, &sigmask);
  765         return (kern_sigsuspend(td, sigmask));
  766 }
  767 
  768 int
  769 linux_pause(struct thread *td, struct linux_pause_args *args)
  770 {
  771         struct proc *p = td->td_proc;
  772         sigset_t sigmask;
  773 
  774 #ifdef DEBUG
  775         if (ldebug(pause))
  776                 printf(ARGS(pause, ""));
  777 #endif
  778 
  779         PROC_LOCK(p);
  780         sigmask = td->td_sigmask;
  781         PROC_UNLOCK(p);
  782         return (kern_sigsuspend(td, sigmask));
  783 }
  784 
  785 int
  786 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
  787 {
  788         stack_t ss, oss;
  789         l_stack_t lss;
  790         int error;
  791 
  792 #ifdef DEBUG
  793         if (ldebug(sigaltstack))
  794                 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss);
  795 #endif
  796 
  797         if (uap->uss != NULL) {
  798                 error = copyin(uap->uss, &lss, sizeof(l_stack_t));
  799                 if (error)
  800                         return (error);
  801 
  802                 ss.ss_sp = lss.ss_sp;
  803                 ss.ss_size = lss.ss_size;
  804                 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
  805         }
  806         error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
  807             (uap->uoss != NULL) ? &oss : NULL);
  808         if (!error && uap->uoss != NULL) {
  809                 lss.ss_sp = oss.ss_sp;
  810                 lss.ss_size = oss.ss_size;
  811                 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
  812                 error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
  813         }
  814 
  815         return (error);
  816 }
  817 
  818 int
  819 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
  820 {
  821         struct ftruncate_args sa;
  822 
  823 #ifdef DEBUG
  824         if (ldebug(ftruncate64))
  825                 printf(ARGS(ftruncate64, "%u, %jd"), args->fd,
  826                     (intmax_t)args->length);
  827 #endif
  828 
  829         sa.fd = args->fd;
  830         sa.length = args->length;
  831         return sys_ftruncate(td, &sa);
  832 }
  833 
  834 int
  835 linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args)
  836 {
  837         struct l_user_desc info;
  838         int error;
  839         int idx;
  840         int a[2];
  841         struct segment_descriptor sd;
  842 
  843         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
  844         if (error)
  845                 return (error);
  846 
  847 #ifdef DEBUG
  848         if (ldebug(set_thread_area))
  849                 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, %i, %i, %i\n"),
  850                       info.entry_number,
  851                       info.base_addr,
  852                       info.limit,
  853                       info.seg_32bit,
  854                       info.contents,
  855                       info.read_exec_only,
  856                       info.limit_in_pages,
  857                       info.seg_not_present,
  858                       info.useable);
  859 #endif
  860 
  861         idx = info.entry_number;
  862         /* 
  863          * Semantics of linux version: every thread in the system has array of
  864          * 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This 
  865          * syscall loads one of the selected tls decriptors with a value and
  866          * also loads GDT descriptors 6, 7 and 8 with the content of the
  867          * per-thread descriptors.
  868          *
  869          * Semantics of fbsd version: I think we can ignore that linux has 3 
  870          * per-thread descriptors and use just the 1st one. The tls_array[]
  871          * is used only in set/get-thread_area() syscalls and for loading the
  872          * GDT descriptors. In fbsd we use just one GDT descriptor for TLS so
  873          * we will load just one. 
  874          *
  875          * XXX: this doesn't work when a user space process tries to use more
  876          * than 1 TLS segment. Comment in the linux sources says wine might do
  877          * this.
  878          */
  879 
  880         /* 
  881          * we support just GLIBC TLS now 
  882          * we should let 3 proceed as well because we use this segment so
  883          * if code does two subsequent calls it should succeed
  884          */
  885         if (idx != 6 && idx != -1 && idx != 3)
  886                 return (EINVAL);
  887 
  888         /* 
  889          * we have to copy out the GDT entry we use
  890          * FreeBSD uses GDT entry #3 for storing %gs so load that
  891          *
  892          * XXX: what if a user space program doesn't check this value and tries
  893          * to use 6, 7 or 8? 
  894          */
  895         idx = info.entry_number = 3;
  896         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
  897         if (error)
  898                 return (error);
  899 
  900         if (LINUX_LDT_empty(&info)) {
  901                 a[0] = 0;
  902                 a[1] = 0;
  903         } else {
  904                 a[0] = LINUX_LDT_entry_a(&info);
  905                 a[1] = LINUX_LDT_entry_b(&info);
  906         }
  907 
  908         memcpy(&sd, &a, sizeof(a));
  909 #ifdef DEBUG
  910         if (ldebug(set_thread_area))
  911                 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,
  912                         sd.sd_hibase,
  913                         sd.sd_lolimit,
  914                         sd.sd_hilimit,
  915                         sd.sd_type,
  916                         sd.sd_dpl,
  917                         sd.sd_p,
  918                         sd.sd_xx,
  919                         sd.sd_def32,
  920                         sd.sd_gran);
  921 #endif
  922 
  923         /* this is taken from i386 version of cpu_set_user_tls() */
  924         critical_enter();
  925         /* set %gs */
  926         td->td_pcb->pcb_gsd = sd;
  927         PCPU_GET(fsgs_gdt)[1] = sd;
  928         load_gs(GSEL(GUGS_SEL, SEL_UPL));
  929         critical_exit();
  930    
  931         return (0);
  932 }
  933 
  934 int
  935 linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args)
  936 {
  937         
  938         struct l_user_desc info;
  939         int error;
  940         int idx;
  941         struct l_desc_struct desc;
  942         struct segment_descriptor sd;
  943 
  944 #ifdef DEBUG
  945         if (ldebug(get_thread_area))
  946                 printf(ARGS(get_thread_area, "%p"), args->desc);
  947 #endif
  948 
  949         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
  950         if (error)
  951                 return (error);
  952 
  953         idx = info.entry_number;
  954         /* XXX: I am not sure if we want 3 to be allowed too. */
  955         if (idx != 6 && idx != 3)
  956                 return (EINVAL);
  957 
  958         idx = 3;
  959 
  960         memset(&info, 0, sizeof(info));
  961 
  962         sd = PCPU_GET(fsgs_gdt)[1];
  963 
  964         memcpy(&desc, &sd, sizeof(desc));
  965 
  966         info.entry_number = idx;
  967         info.base_addr = LINUX_GET_BASE(&desc);
  968         info.limit = LINUX_GET_LIMIT(&desc);
  969         info.seg_32bit = LINUX_GET_32BIT(&desc);
  970         info.contents = LINUX_GET_CONTENTS(&desc);
  971         info.read_exec_only = !LINUX_GET_WRITABLE(&desc);
  972         info.limit_in_pages = LINUX_GET_LIMIT_PAGES(&desc);
  973         info.seg_not_present = !LINUX_GET_PRESENT(&desc);
  974         info.useable = LINUX_GET_USEABLE(&desc);
  975 
  976         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
  977         if (error)
  978                 return (EFAULT);
  979 
  980         return (0);
  981 }
  982 
  983 /* XXX: this wont work with module - convert it */
  984 int
  985 linux_mq_open(struct thread *td, struct linux_mq_open_args *args)
  986 {
  987 #ifdef P1003_1B_MQUEUE
  988         return sys_kmq_open(td, (struct kmq_open_args *) args);
  989 #else
  990         return (ENOSYS);
  991 #endif
  992 }
  993 
  994 int
  995 linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args)
  996 {
  997 #ifdef P1003_1B_MQUEUE
  998         return sys_kmq_unlink(td, (struct kmq_unlink_args *) args);
  999 #else
 1000         return (ENOSYS);
 1001 #endif
 1002 }
 1003 
 1004 int
 1005 linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args)
 1006 {
 1007 #ifdef P1003_1B_MQUEUE
 1008         return sys_kmq_timedsend(td, (struct kmq_timedsend_args *) args);
 1009 #else
 1010         return (ENOSYS);
 1011 #endif
 1012 }
 1013 
 1014 int
 1015 linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args)
 1016 {
 1017 #ifdef P1003_1B_MQUEUE
 1018         return sys_kmq_timedreceive(td, (struct kmq_timedreceive_args *) args);
 1019 #else
 1020         return (ENOSYS);
 1021 #endif
 1022 }
 1023 
 1024 int
 1025 linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args)
 1026 {
 1027 #ifdef P1003_1B_MQUEUE
 1028         return sys_kmq_notify(td, (struct kmq_notify_args *) args);
 1029 #else
 1030         return (ENOSYS);
 1031 #endif
 1032 }
 1033 
 1034 int
 1035 linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args)
 1036 {
 1037 #ifdef P1003_1B_MQUEUE
 1038         return sys_kmq_setattr(td, (struct kmq_setattr_args *) args);
 1039 #else
 1040         return (ENOSYS);
 1041 #endif
 1042 }
 1043 
 1044 int
 1045 linux_wait4(struct thread *td, struct linux_wait4_args *args)
 1046 {
 1047         int error, options;
 1048         struct rusage ru, *rup;
 1049 
 1050 #ifdef DEBUG
 1051         if (ldebug(wait4))
 1052                 printf(ARGS(wait4, "%d, %p, %d, %p"),
 1053                     args->pid, (void *)args->status, args->options,
 1054                     (void *)args->rusage);
 1055 #endif
 1056 
 1057         options = (args->options & (WNOHANG | WUNTRACED));
 1058         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
 1059         if (args->options & __WCLONE)
 1060                 options |= WLINUXCLONE;
 1061 
 1062         if (args->rusage != NULL)
 1063                 rup = &ru;
 1064         else
 1065                 rup = NULL;
 1066         error = linux_common_wait(td, args->pid, args->status, options, rup);
 1067         if (error)
 1068                 return (error);
 1069         if (args->rusage != NULL)
 1070                 error = copyout(&ru, args->rusage, sizeof(ru));
 1071 
 1072         return (error);
 1073 }

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