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: releng/10.1/sys/amd64/linux32/linux32_machdep.c 255219 2013-09-05 00:09:56Z pjd $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/systm.h>
   37 #include <sys/capability.h>
   38 #include <sys/file.h>
   39 #include <sys/fcntl.h>
   40 #include <sys/clock.h>
   41 #include <sys/imgact.h>
   42 #include <sys/limits.h>
   43 #include <sys/lock.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mman.h>
   46 #include <sys/mutex.h>
   47 #include <sys/priv.h>
   48 #include <sys/proc.h>
   49 #include <sys/resource.h>
   50 #include <sys/resourcevar.h>
   51 #include <sys/sched.h>
   52 #include <sys/syscallsubr.h>
   53 #include <sys/sysproto.h>
   54 #include <sys/unistd.h>
   55 #include <sys/wait.h>
   56 
   57 #include <machine/frame.h>
   58 #include <machine/pcb.h>
   59 #include <machine/psl.h>
   60 #include <machine/segments.h>
   61 #include <machine/specialreg.h>
   62 
   63 #include <vm/vm.h>
   64 #include <vm/pmap.h>
   65 #include <vm/vm_map.h>
   66 
   67 #include <compat/freebsd32/freebsd32_util.h>
   68 #include <amd64/linux32/linux.h>
   69 #include <amd64/linux32/linux32_proto.h>
   70 #include <compat/linux/linux_ipc.h>
   71 #include <compat/linux/linux_misc.h>
   72 #include <compat/linux/linux_signal.h>
   73 #include <compat/linux/linux_util.h>
   74 #include <compat/linux/linux_emul.h>
   75 
   76 struct l_old_select_argv {
   77         l_int           nfds;
   78         l_uintptr_t     readfds;
   79         l_uintptr_t     writefds;
   80         l_uintptr_t     exceptfds;
   81         l_uintptr_t     timeout;
   82 } __packed;
   83 
   84 int
   85 linux_to_bsd_sigaltstack(int lsa)
   86 {
   87         int bsa = 0;
   88 
   89         if (lsa & LINUX_SS_DISABLE)
   90                 bsa |= SS_DISABLE;
   91         if (lsa & LINUX_SS_ONSTACK)
   92                 bsa |= SS_ONSTACK;
   93         return (bsa);
   94 }
   95 
   96 static int      linux_mmap_common(struct thread *td, l_uintptr_t addr,
   97                     l_size_t len, l_int prot, l_int flags, l_int fd,
   98                     l_loff_t pos);
   99 
  100 int
  101 bsd_to_linux_sigaltstack(int bsa)
  102 {
  103         int lsa = 0;
  104 
  105         if (bsa & SS_DISABLE)
  106                 lsa |= LINUX_SS_DISABLE;
  107         if (bsa & SS_ONSTACK)
  108                 lsa |= LINUX_SS_ONSTACK;
  109         return (lsa);
  110 }
  111 
  112 static void
  113 bsd_to_linux_rusage(struct rusage *ru, struct l_rusage *lru)
  114 {
  115 
  116         lru->ru_utime.tv_sec = ru->ru_utime.tv_sec;
  117         lru->ru_utime.tv_usec = ru->ru_utime.tv_usec;
  118         lru->ru_stime.tv_sec = ru->ru_stime.tv_sec;
  119         lru->ru_stime.tv_usec = ru->ru_stime.tv_usec;
  120         lru->ru_maxrss = ru->ru_maxrss;
  121         lru->ru_ixrss = ru->ru_ixrss;
  122         lru->ru_idrss = ru->ru_idrss;
  123         lru->ru_isrss = ru->ru_isrss;
  124         lru->ru_minflt = ru->ru_minflt;
  125         lru->ru_majflt = ru->ru_majflt;
  126         lru->ru_nswap = ru->ru_nswap;
  127         lru->ru_inblock = ru->ru_inblock;
  128         lru->ru_oublock = ru->ru_oublock;
  129         lru->ru_msgsnd = ru->ru_msgsnd;
  130         lru->ru_msgrcv = ru->ru_msgrcv;
  131         lru->ru_nsignals = ru->ru_nsignals;
  132         lru->ru_nvcsw = ru->ru_nvcsw;
  133         lru->ru_nivcsw = ru->ru_nivcsw;
  134 }
  135 
  136 int
  137 linux_execve(struct thread *td, struct linux_execve_args *args)
  138 {
  139         struct image_args eargs;
  140         char *path;
  141         int error;
  142 
  143         LCONVPATHEXIST(td, args->path, &path);
  144 
  145 #ifdef DEBUG
  146         if (ldebug(execve))
  147                 printf(ARGS(execve, "%s"), path);
  148 #endif
  149 
  150         error = freebsd32_exec_copyin_args(&eargs, path, UIO_SYSSPACE,
  151             args->argp, args->envp);
  152         free(path, M_TEMP);
  153         if (error == 0)
  154                 error = kern_execve(td, &eargs, NULL);
  155         if (error == 0)
  156                 /* Linux process can execute FreeBSD one, do not attempt
  157                  * to create emuldata for such process using
  158                  * linux_proc_init, this leads to a panic on KASSERT
  159                  * because such process has p->p_emuldata == NULL.
  160                  */
  161                 if (SV_PROC_ABI(td->td_proc) == SV_ABI_LINUX)
  162                         error = linux_proc_init(td, 0, 0);
  163         return (error);
  164 }
  165 
  166 CTASSERT(sizeof(struct l_iovec32) == 8);
  167 
  168 static int
  169 linux32_copyinuio(struct l_iovec32 *iovp, l_ulong iovcnt, struct uio **uiop)
  170 {
  171         struct l_iovec32 iov32;
  172         struct iovec *iov;
  173         struct uio *uio;
  174         uint32_t iovlen;
  175         int error, i;
  176 
  177         *uiop = NULL;
  178         if (iovcnt > UIO_MAXIOV)
  179                 return (EINVAL);
  180         iovlen = iovcnt * sizeof(struct iovec);
  181         uio = malloc(iovlen + sizeof(*uio), M_IOV, M_WAITOK);
  182         iov = (struct iovec *)(uio + 1);
  183         for (i = 0; i < iovcnt; i++) {
  184                 error = copyin(&iovp[i], &iov32, sizeof(struct l_iovec32));
  185                 if (error) {
  186                         free(uio, M_IOV);
  187                         return (error);
  188                 }
  189                 iov[i].iov_base = PTRIN(iov32.iov_base);
  190                 iov[i].iov_len = iov32.iov_len;
  191         }
  192         uio->uio_iov = iov;
  193         uio->uio_iovcnt = iovcnt;
  194         uio->uio_segflg = UIO_USERSPACE;
  195         uio->uio_offset = -1;
  196         uio->uio_resid = 0;
  197         for (i = 0; i < iovcnt; i++) {
  198                 if (iov->iov_len > INT_MAX - uio->uio_resid) {
  199                         free(uio, M_IOV);
  200                         return (EINVAL);
  201                 }
  202                 uio->uio_resid += iov->iov_len;
  203                 iov++;
  204         }
  205         *uiop = uio;
  206         return (0);
  207 }
  208 
  209 int
  210 linux32_copyiniov(struct l_iovec32 *iovp32, l_ulong iovcnt, struct iovec **iovp,
  211     int error)
  212 {
  213         struct l_iovec32 iov32;
  214         struct iovec *iov;
  215         uint32_t iovlen;
  216         int i;
  217 
  218         *iovp = NULL;
  219         if (iovcnt > UIO_MAXIOV)
  220                 return (error);
  221         iovlen = iovcnt * sizeof(struct iovec);
  222         iov = malloc(iovlen, M_IOV, M_WAITOK);
  223         for (i = 0; i < iovcnt; i++) {
  224                 error = copyin(&iovp32[i], &iov32, sizeof(struct l_iovec32));
  225                 if (error) {
  226                         free(iov, M_IOV);
  227                         return (error);
  228                 }
  229                 iov[i].iov_base = PTRIN(iov32.iov_base);
  230                 iov[i].iov_len = iov32.iov_len;
  231         }
  232         *iovp = iov;
  233         return(0);
  234 
  235 }
  236 
  237 int
  238 linux_readv(struct thread *td, struct linux_readv_args *uap)
  239 {
  240         struct uio *auio;
  241         int error;
  242 
  243         error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
  244         if (error)
  245                 return (error);
  246         error = kern_readv(td, uap->fd, auio);
  247         free(auio, M_IOV);
  248         return (error);
  249 }
  250 
  251 int
  252 linux_writev(struct thread *td, struct linux_writev_args *uap)
  253 {
  254         struct uio *auio;
  255         int error;
  256 
  257         error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
  258         if (error)
  259                 return (error);
  260         error = kern_writev(td, uap->fd, auio);
  261         free(auio, M_IOV);
  262         return (error);
  263 }
  264 
  265 struct l_ipc_kludge {
  266         l_uintptr_t msgp;
  267         l_long msgtyp;
  268 } __packed;
  269 
  270 int
  271 linux_ipc(struct thread *td, struct linux_ipc_args *args)
  272 {
  273 
  274         switch (args->what & 0xFFFF) {
  275         case LINUX_SEMOP: {
  276                 struct linux_semop_args a;
  277 
  278                 a.semid = args->arg1;
  279                 a.tsops = args->ptr;
  280                 a.nsops = args->arg2;
  281                 return (linux_semop(td, &a));
  282         }
  283         case LINUX_SEMGET: {
  284                 struct linux_semget_args a;
  285 
  286                 a.key = args->arg1;
  287                 a.nsems = args->arg2;
  288                 a.semflg = args->arg3;
  289                 return (linux_semget(td, &a));
  290         }
  291         case LINUX_SEMCTL: {
  292                 struct linux_semctl_args a;
  293                 int error;
  294 
  295                 a.semid = args->arg1;
  296                 a.semnum = args->arg2;
  297                 a.cmd = args->arg3;
  298                 error = copyin(args->ptr, &a.arg, sizeof(a.arg));
  299                 if (error)
  300                         return (error);
  301                 return (linux_semctl(td, &a));
  302         }
  303         case LINUX_MSGSND: {
  304                 struct linux_msgsnd_args a;
  305 
  306                 a.msqid = args->arg1;
  307                 a.msgp = args->ptr;
  308                 a.msgsz = args->arg2;
  309                 a.msgflg = args->arg3;
  310                 return (linux_msgsnd(td, &a));
  311         }
  312         case LINUX_MSGRCV: {
  313                 struct linux_msgrcv_args a;
  314 
  315                 a.msqid = args->arg1;
  316                 a.msgsz = args->arg2;
  317                 a.msgflg = args->arg3;
  318                 if ((args->what >> 16) == 0) {
  319                         struct l_ipc_kludge tmp;
  320                         int error;
  321 
  322                         if (args->ptr == 0)
  323                                 return (EINVAL);
  324                         error = copyin(args->ptr, &tmp, sizeof(tmp));
  325                         if (error)
  326                                 return (error);
  327                         a.msgp = PTRIN(tmp.msgp);
  328                         a.msgtyp = tmp.msgtyp;
  329                 } else {
  330                         a.msgp = args->ptr;
  331                         a.msgtyp = args->arg5;
  332                 }
  333                 return (linux_msgrcv(td, &a));
  334         }
  335         case LINUX_MSGGET: {
  336                 struct linux_msgget_args a;
  337 
  338                 a.key = args->arg1;
  339                 a.msgflg = args->arg2;
  340                 return (linux_msgget(td, &a));
  341         }
  342         case LINUX_MSGCTL: {
  343                 struct linux_msgctl_args a;
  344 
  345                 a.msqid = args->arg1;
  346                 a.cmd = args->arg2;
  347                 a.buf = args->ptr;
  348                 return (linux_msgctl(td, &a));
  349         }
  350         case LINUX_SHMAT: {
  351                 struct linux_shmat_args a;
  352 
  353                 a.shmid = args->arg1;
  354                 a.shmaddr = args->ptr;
  355                 a.shmflg = args->arg2;
  356                 a.raddr = PTRIN((l_uint)args->arg3);
  357                 return (linux_shmat(td, &a));
  358         }
  359         case LINUX_SHMDT: {
  360                 struct linux_shmdt_args a;
  361 
  362                 a.shmaddr = args->ptr;
  363                 return (linux_shmdt(td, &a));
  364         }
  365         case LINUX_SHMGET: {
  366                 struct linux_shmget_args a;
  367 
  368                 a.key = args->arg1;
  369                 a.size = args->arg2;
  370                 a.shmflg = args->arg3;
  371                 return (linux_shmget(td, &a));
  372         }
  373         case LINUX_SHMCTL: {
  374                 struct linux_shmctl_args a;
  375 
  376                 a.shmid = args->arg1;
  377                 a.cmd = args->arg2;
  378                 a.buf = args->ptr;
  379                 return (linux_shmctl(td, &a));
  380         }
  381         default:
  382                 break;
  383         }
  384 
  385         return (EINVAL);
  386 }
  387 
  388 int
  389 linux_old_select(struct thread *td, struct linux_old_select_args *args)
  390 {
  391         struct l_old_select_argv linux_args;
  392         struct linux_select_args newsel;
  393         int error;
  394 
  395 #ifdef DEBUG
  396         if (ldebug(old_select))
  397                 printf(ARGS(old_select, "%p"), args->ptr);
  398 #endif
  399 
  400         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  401         if (error)
  402                 return (error);
  403 
  404         newsel.nfds = linux_args.nfds;
  405         newsel.readfds = PTRIN(linux_args.readfds);
  406         newsel.writefds = PTRIN(linux_args.writefds);
  407         newsel.exceptfds = PTRIN(linux_args.exceptfds);
  408         newsel.timeout = PTRIN(linux_args.timeout);
  409         return (linux_select(td, &newsel));
  410 }
  411 
  412 int
  413 linux_set_cloned_tls(struct thread *td, void *desc)
  414 {
  415         struct user_segment_descriptor sd;
  416         struct l_user_desc info;
  417         struct pcb *pcb;
  418         int error;
  419         int a[2];
  420 
  421         error = copyin(desc, &info, sizeof(struct l_user_desc));
  422         if (error) {
  423                 printf(LMSG("copyin failed!"));
  424         } else {
  425                 /* We might copy out the entry_number as GUGS32_SEL. */
  426                 info.entry_number = GUGS32_SEL;
  427                 error = copyout(&info, desc, sizeof(struct l_user_desc));
  428                 if (error)
  429                         printf(LMSG("copyout failed!"));
  430 
  431                 a[0] = LINUX_LDT_entry_a(&info);
  432                 a[1] = LINUX_LDT_entry_b(&info);
  433 
  434                 memcpy(&sd, &a, sizeof(a));
  435 #ifdef DEBUG
  436                 if (ldebug(clone))
  437                         printf("Segment created in clone with "
  438                             "CLONE_SETTLS: lobase: %x, hibase: %x, "
  439                             "lolimit: %x, hilimit: %x, type: %i, "
  440                             "dpl: %i, p: %i, xx: %i, long: %i, "
  441                             "def32: %i, gran: %i\n", sd.sd_lobase,
  442                             sd.sd_hibase, sd.sd_lolimit, sd.sd_hilimit,
  443                             sd.sd_type, sd.sd_dpl, sd.sd_p, sd.sd_xx,
  444                             sd.sd_long, sd.sd_def32, sd.sd_gran);
  445 #endif
  446                 pcb = td->td_pcb;
  447                 pcb->pcb_gsbase = (register_t)info.base_addr;
  448 /* XXXKIB       pcb->pcb_gs32sd = sd; */
  449                 td->td_frame->tf_gs = GSEL(GUGS32_SEL, SEL_UPL);
  450                 set_pcb_flags(pcb, PCB_32BIT);
  451         }
  452 
  453         return (error);
  454 }
  455 
  456 int
  457 linux_set_upcall_kse(struct thread *td, register_t stack)
  458 {
  459 
  460         td->td_frame->tf_rsp = stack;
  461 
  462         return (0);
  463 }
  464 
  465 #define STACK_SIZE  (2 * 1024 * 1024)
  466 #define GUARD_SIZE  (4 * PAGE_SIZE)
  467 
  468 int
  469 linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
  470 {
  471 
  472 #ifdef DEBUG
  473         if (ldebug(mmap2))
  474                 printf(ARGS(mmap2, "0x%08x, %d, %d, 0x%08x, %d, %d"),
  475                     args->addr, args->len, args->prot,
  476                     args->flags, args->fd, args->pgoff);
  477 #endif
  478 
  479         return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
  480                 args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
  481                 PAGE_SIZE));
  482 }
  483 
  484 int
  485 linux_mmap(struct thread *td, struct linux_mmap_args *args)
  486 {
  487         int error;
  488         struct l_mmap_argv linux_args;
  489 
  490         error = copyin(args->ptr, &linux_args, sizeof(linux_args));
  491         if (error)
  492                 return (error);
  493 
  494 #ifdef DEBUG
  495         if (ldebug(mmap))
  496                 printf(ARGS(mmap, "0x%08x, %d, %d, 0x%08x, %d, %d"),
  497                     linux_args.addr, linux_args.len, linux_args.prot,
  498                     linux_args.flags, linux_args.fd, linux_args.pgoff);
  499 #endif
  500 
  501         return (linux_mmap_common(td, linux_args.addr, linux_args.len,
  502             linux_args.prot, linux_args.flags, linux_args.fd,
  503             (uint32_t)linux_args.pgoff));
  504 }
  505 
  506 static int
  507 linux_mmap_common(struct thread *td, l_uintptr_t addr, l_size_t len, l_int prot,
  508     l_int flags, l_int fd, l_loff_t pos)
  509 {
  510         struct proc *p = td->td_proc;
  511         struct mmap_args /* {
  512                 caddr_t addr;
  513                 size_t len;
  514                 int prot;
  515                 int flags;
  516                 int fd;
  517                 long pad;
  518                 off_t pos;
  519         } */ bsd_args;
  520         int error;
  521         struct file *fp;
  522         cap_rights_t rights;
  523 
  524         error = 0;
  525         bsd_args.flags = 0;
  526         fp = NULL;
  527 
  528         /*
  529          * Linux mmap(2):
  530          * You must specify exactly one of MAP_SHARED and MAP_PRIVATE
  531          */
  532         if (!((flags & LINUX_MAP_SHARED) ^ (flags & LINUX_MAP_PRIVATE)))
  533                 return (EINVAL);
  534 
  535         if (flags & LINUX_MAP_SHARED)
  536                 bsd_args.flags |= MAP_SHARED;
  537         if (flags & LINUX_MAP_PRIVATE)
  538                 bsd_args.flags |= MAP_PRIVATE;
  539         if (flags & LINUX_MAP_FIXED)
  540                 bsd_args.flags |= MAP_FIXED;
  541         if (flags & LINUX_MAP_ANON) {
  542                 /* Enforce pos to be on page boundary, then ignore. */
  543                 if ((pos & PAGE_MASK) != 0)
  544                         return (EINVAL);
  545                 pos = 0;
  546                 bsd_args.flags |= MAP_ANON;
  547         } else
  548                 bsd_args.flags |= MAP_NOSYNC;
  549         if (flags & LINUX_MAP_GROWSDOWN)
  550                 bsd_args.flags |= MAP_STACK;
  551 
  552         /*
  553          * PROT_READ, PROT_WRITE, or PROT_EXEC implies PROT_READ and PROT_EXEC
  554          * on Linux/i386. We do this to ensure maximum compatibility.
  555          * Linux/ia64 does the same in i386 emulation mode.
  556          */
  557         bsd_args.prot = prot;
  558         if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
  559                 bsd_args.prot |= PROT_READ | PROT_EXEC;
  560 
  561         /* Linux does not check file descriptor when MAP_ANONYMOUS is set. */
  562         bsd_args.fd = (bsd_args.flags & MAP_ANON) ? -1 : fd;
  563         if (bsd_args.fd != -1) {
  564                 /*
  565                  * Linux follows Solaris mmap(2) description:
  566                  * The file descriptor fildes is opened with
  567                  * read permission, regardless of the
  568                  * protection options specified.
  569                  */
  570 
  571                 error = fget(td, bsd_args.fd,
  572                     cap_rights_init(&rights, CAP_MMAP), &fp);
  573                 if (error != 0)
  574                         return (error);
  575                 if (fp->f_type != DTYPE_VNODE) {
  576                         fdrop(fp, td);
  577                         return (EINVAL);
  578                 }
  579 
  580                 /* Linux mmap() just fails for O_WRONLY files */
  581                 if (!(fp->f_flag & FREAD)) {
  582                         fdrop(fp, td);
  583                         return (EACCES);
  584                 }
  585 
  586                 fdrop(fp, td);
  587         }
  588 
  589         if (flags & LINUX_MAP_GROWSDOWN) {
  590                 /*
  591                  * The Linux MAP_GROWSDOWN option does not limit auto
  592                  * growth of the region.  Linux mmap with this option
  593                  * takes as addr the inital BOS, and as len, the initial
  594                  * region size.  It can then grow down from addr without
  595                  * limit.  However, Linux threads has an implicit internal
  596                  * limit to stack size of STACK_SIZE.  Its just not
  597                  * enforced explicitly in Linux.  But, here we impose
  598                  * a limit of (STACK_SIZE - GUARD_SIZE) on the stack
  599                  * region, since we can do this with our mmap.
  600                  *
  601                  * Our mmap with MAP_STACK takes addr as the maximum
  602                  * downsize limit on BOS, and as len the max size of
  603                  * the region.  It then maps the top SGROWSIZ bytes,
  604                  * and auto grows the region down, up to the limit
  605                  * in addr.
  606                  *
  607                  * If we don't use the MAP_STACK option, the effect
  608                  * of this code is to allocate a stack region of a
  609                  * fixed size of (STACK_SIZE - GUARD_SIZE).
  610                  */
  611 
  612                 if ((caddr_t)PTRIN(addr) + len > p->p_vmspace->vm_maxsaddr) {
  613                         /*
  614                          * Some Linux apps will attempt to mmap
  615                          * thread stacks near the top of their
  616                          * address space.  If their TOS is greater
  617                          * than vm_maxsaddr, vm_map_growstack()
  618                          * will confuse the thread stack with the
  619                          * process stack and deliver a SEGV if they
  620                          * attempt to grow the thread stack past their
  621                          * current stacksize rlimit.  To avoid this,
  622                          * adjust vm_maxsaddr upwards to reflect
  623                          * the current stacksize rlimit rather
  624                          * than the maximum possible stacksize.
  625                          * It would be better to adjust the
  626                          * mmap'ed region, but some apps do not check
  627                          * mmap's return value.
  628                          */
  629                         PROC_LOCK(p);
  630                         p->p_vmspace->vm_maxsaddr = (char *)LINUX32_USRSTACK -
  631                             lim_cur(p, RLIMIT_STACK);
  632                         PROC_UNLOCK(p);
  633                 }
  634 
  635                 /*
  636                  * This gives us our maximum stack size and a new BOS.
  637                  * If we're using VM_STACK, then mmap will just map
  638                  * the top SGROWSIZ bytes, and let the stack grow down
  639                  * to the limit at BOS.  If we're not using VM_STACK
  640                  * we map the full stack, since we don't have a way
  641                  * to autogrow it.
  642                  */
  643                 if (len > STACK_SIZE - GUARD_SIZE) {
  644                         bsd_args.addr = (caddr_t)PTRIN(addr);
  645                         bsd_args.len = len;
  646                 } else {
  647                         bsd_args.addr = (caddr_t)PTRIN(addr) -
  648                             (STACK_SIZE - GUARD_SIZE - len);
  649                         bsd_args.len = STACK_SIZE - GUARD_SIZE;
  650                 }
  651         } else {
  652                 bsd_args.addr = (caddr_t)PTRIN(addr);
  653                 bsd_args.len  = len;
  654         }
  655         bsd_args.pos = pos;
  656 
  657 #ifdef DEBUG
  658         if (ldebug(mmap))
  659                 printf("-> %s(%p, %d, %d, 0x%08x, %d, 0x%x)\n",
  660                     __func__,
  661                     (void *)bsd_args.addr, (int)bsd_args.len, bsd_args.prot,
  662                     bsd_args.flags, bsd_args.fd, (int)bsd_args.pos);
  663 #endif
  664         error = sys_mmap(td, &bsd_args);
  665 #ifdef DEBUG
  666         if (ldebug(mmap))
  667                 printf("-> %s() return: 0x%x (0x%08x)\n",
  668                         __func__, error, (u_int)td->td_retval[0]);
  669 #endif
  670         return (error);
  671 }
  672 
  673 int
  674 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
  675 {
  676         struct mprotect_args bsd_args;
  677 
  678         bsd_args.addr = uap->addr;
  679         bsd_args.len = uap->len;
  680         bsd_args.prot = uap->prot;
  681         if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
  682                 bsd_args.prot |= PROT_READ | PROT_EXEC;
  683         return (sys_mprotect(td, &bsd_args));
  684 }
  685 
  686 int
  687 linux_iopl(struct thread *td, struct linux_iopl_args *args)
  688 {
  689         int error;
  690 
  691         if (args->level < 0 || args->level > 3)
  692                 return (EINVAL);
  693         if ((error = priv_check(td, PRIV_IO)) != 0)
  694                 return (error);
  695         if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
  696                 return (error);
  697         td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) |
  698             (args->level * (PSL_IOPL / 3));
  699 
  700         return (0);
  701 }
  702 
  703 int
  704 linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
  705 {
  706         l_osigaction_t osa;
  707         l_sigaction_t act, oact;
  708         int error;
  709 
  710 #ifdef DEBUG
  711         if (ldebug(sigaction))
  712                 printf(ARGS(sigaction, "%d, %p, %p"),
  713                     args->sig, (void *)args->nsa, (void *)args->osa);
  714 #endif
  715 
  716         if (args->nsa != NULL) {
  717                 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
  718                 if (error)
  719                         return (error);
  720                 act.lsa_handler = osa.lsa_handler;
  721                 act.lsa_flags = osa.lsa_flags;
  722                 act.lsa_restorer = osa.lsa_restorer;
  723                 LINUX_SIGEMPTYSET(act.lsa_mask);
  724                 act.lsa_mask.__bits[0] = osa.lsa_mask;
  725         }
  726 
  727         error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
  728             args->osa ? &oact : NULL);
  729 
  730         if (args->osa != NULL && !error) {
  731                 osa.lsa_handler = oact.lsa_handler;
  732                 osa.lsa_flags = oact.lsa_flags;
  733                 osa.lsa_restorer = oact.lsa_restorer;
  734                 osa.lsa_mask = oact.lsa_mask.__bits[0];
  735                 error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
  736         }
  737 
  738         return (error);
  739 }
  740 
  741 /*
  742  * Linux has two extra args, restart and oldmask.  We don't use these,
  743  * but it seems that "restart" is actually a context pointer that
  744  * enables the signal to happen with a different register set.
  745  */
  746 int
  747 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
  748 {
  749         sigset_t sigmask;
  750         l_sigset_t mask;
  751 
  752 #ifdef DEBUG
  753         if (ldebug(sigsuspend))
  754                 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask);
  755 #endif
  756 
  757         LINUX_SIGEMPTYSET(mask);
  758         mask.__bits[0] = args->mask;
  759         linux_to_bsd_sigset(&mask, &sigmask);
  760         return (kern_sigsuspend(td, sigmask));
  761 }
  762 
  763 int
  764 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
  765 {
  766         l_sigset_t lmask;
  767         sigset_t sigmask;
  768         int error;
  769 
  770 #ifdef DEBUG
  771         if (ldebug(rt_sigsuspend))
  772                 printf(ARGS(rt_sigsuspend, "%p, %d"),
  773                     (void *)uap->newset, uap->sigsetsize);
  774 #endif
  775 
  776         if (uap->sigsetsize != sizeof(l_sigset_t))
  777                 return (EINVAL);
  778 
  779         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
  780         if (error)
  781                 return (error);
  782 
  783         linux_to_bsd_sigset(&lmask, &sigmask);
  784         return (kern_sigsuspend(td, sigmask));
  785 }
  786 
  787 int
  788 linux_pause(struct thread *td, struct linux_pause_args *args)
  789 {
  790         struct proc *p = td->td_proc;
  791         sigset_t sigmask;
  792 
  793 #ifdef DEBUG
  794         if (ldebug(pause))
  795                 printf(ARGS(pause, ""));
  796 #endif
  797 
  798         PROC_LOCK(p);
  799         sigmask = td->td_sigmask;
  800         PROC_UNLOCK(p);
  801         return (kern_sigsuspend(td, sigmask));
  802 }
  803 
  804 int
  805 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
  806 {
  807         stack_t ss, oss;
  808         l_stack_t lss;
  809         int error;
  810 
  811 #ifdef DEBUG
  812         if (ldebug(sigaltstack))
  813                 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss);
  814 #endif
  815 
  816         if (uap->uss != NULL) {
  817                 error = copyin(uap->uss, &lss, sizeof(l_stack_t));
  818                 if (error)
  819                         return (error);
  820 
  821                 ss.ss_sp = PTRIN(lss.ss_sp);
  822                 ss.ss_size = lss.ss_size;
  823                 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
  824         }
  825         error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
  826             (uap->uoss != NULL) ? &oss : NULL);
  827         if (!error && uap->uoss != NULL) {
  828                 lss.ss_sp = PTROUT(oss.ss_sp);
  829                 lss.ss_size = oss.ss_size;
  830                 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
  831                 error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
  832         }
  833 
  834         return (error);
  835 }
  836 
  837 int
  838 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
  839 {
  840         struct ftruncate_args sa;
  841 
  842 #ifdef DEBUG
  843         if (ldebug(ftruncate64))
  844                 printf(ARGS(ftruncate64, "%u, %jd"), args->fd,
  845                     (intmax_t)args->length);
  846 #endif
  847 
  848         sa.fd = args->fd;
  849         sa.length = args->length;
  850         return sys_ftruncate(td, &sa);
  851 }
  852 
  853 int
  854 linux_gettimeofday(struct thread *td, struct linux_gettimeofday_args *uap)
  855 {
  856         struct timeval atv;
  857         l_timeval atv32;
  858         struct timezone rtz;
  859         int error = 0;
  860 
  861         if (uap->tp) {
  862                 microtime(&atv);
  863                 atv32.tv_sec = atv.tv_sec;
  864                 atv32.tv_usec = atv.tv_usec;
  865                 error = copyout(&atv32, uap->tp, sizeof(atv32));
  866         }
  867         if (error == 0 && uap->tzp != NULL) {
  868                 rtz.tz_minuteswest = tz_minuteswest;
  869                 rtz.tz_dsttime = tz_dsttime;
  870                 error = copyout(&rtz, uap->tzp, sizeof(rtz));
  871         }
  872         return (error);
  873 }
  874 
  875 int
  876 linux_settimeofday(struct thread *td, struct linux_settimeofday_args *uap)
  877 {
  878         l_timeval atv32;
  879         struct timeval atv, *tvp;
  880         struct timezone atz, *tzp;
  881         int error;
  882 
  883         if (uap->tp) {
  884                 error = copyin(uap->tp, &atv32, sizeof(atv32));
  885                 if (error)
  886                         return (error);
  887                 atv.tv_sec = atv32.tv_sec;
  888                 atv.tv_usec = atv32.tv_usec;
  889                 tvp = &atv;
  890         } else
  891                 tvp = NULL;
  892         if (uap->tzp) {
  893                 error = copyin(uap->tzp, &atz, sizeof(atz));
  894                 if (error)
  895                         return (error);
  896                 tzp = &atz;
  897         } else
  898                 tzp = NULL;
  899         return (kern_settimeofday(td, tvp, tzp));
  900 }
  901 
  902 int
  903 linux_getrusage(struct thread *td, struct linux_getrusage_args *uap)
  904 {
  905         struct l_rusage s32;
  906         struct rusage s;
  907         int error;
  908 
  909         error = kern_getrusage(td, uap->who, &s);
  910         if (error != 0)
  911                 return (error);
  912         if (uap->rusage != NULL) {
  913                 bsd_to_linux_rusage(&s, &s32);
  914                 error = copyout(&s32, uap->rusage, sizeof(s32));
  915         }
  916         return (error);
  917 }
  918 
  919 int
  920 linux_sched_rr_get_interval(struct thread *td,
  921     struct linux_sched_rr_get_interval_args *uap)
  922 {
  923         struct timespec ts;
  924         struct l_timespec ts32;
  925         int error;
  926 
  927         error = kern_sched_rr_get_interval(td, uap->pid, &ts);
  928         if (error != 0)
  929                 return (error);
  930         ts32.tv_sec = ts.tv_sec;
  931         ts32.tv_nsec = ts.tv_nsec;
  932         return (copyout(&ts32, uap->interval, sizeof(ts32)));
  933 }
  934 
  935 int
  936 linux_set_thread_area(struct thread *td,
  937     struct linux_set_thread_area_args *args)
  938 {
  939         struct l_user_desc info;
  940         struct user_segment_descriptor sd;
  941         struct pcb *pcb;
  942         int a[2];
  943         int error;
  944 
  945         error = copyin(args->desc, &info, sizeof(struct l_user_desc));
  946         if (error)
  947                 return (error);
  948 
  949 #ifdef DEBUG
  950         if (ldebug(set_thread_area))
  951                 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, "
  952                     "%i, %i, %i"), info.entry_number, info.base_addr,
  953                     info.limit, info.seg_32bit, info.contents,
  954                     info.read_exec_only, info.limit_in_pages,
  955                     info.seg_not_present, info.useable);
  956 #endif
  957 
  958         /*
  959          * Semantics of Linux version: every thread in the system has array
  960          * of three TLS descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown.
  961          * This syscall loads one of the selected TLS decriptors with a value
  962          * and also loads GDT descriptors 6, 7 and 8 with the content of
  963          * the per-thread descriptors.
  964          *
  965          * Semantics of FreeBSD version: I think we can ignore that Linux has
  966          * three per-thread descriptors and use just the first one.
  967          * The tls_array[] is used only in [gs]et_thread_area() syscalls and
  968          * for loading the GDT descriptors. We use just one GDT descriptor
  969          * for TLS, so we will load just one.
  970          *
  971          * XXX: This doesn't work when a user space process tries to use more
  972          * than one TLS segment. Comment in the Linux source says wine might
  973          * do this.
  974          */
  975 
  976         /*
  977          * GLIBC reads current %gs and call set_thread_area() with it.
  978          * We should let GUDATA_SEL and GUGS32_SEL proceed as well because
  979          * we use these segments.
  980          */
  981         switch (info.entry_number) {
  982         case GUGS32_SEL:
  983         case GUDATA_SEL:
  984         case 6:
  985         case -1:
  986                 info.entry_number = GUGS32_SEL;
  987                 break;
  988         default:
  989                 return (EINVAL);
  990         }
  991 
  992         /*
  993          * We have to copy out the GDT entry we use.
  994          *
  995          * XXX: What if a user space program does not check the return value
  996          * and tries to use 6, 7 or 8?
  997          */
  998         error = copyout(&info, args->desc, sizeof(struct l_user_desc));
  999         if (error)
 1000                 return (error);
 1001 
 1002         if (LINUX_LDT_empty(&info)) {
 1003                 a[0] = 0;
 1004                 a[1] = 0;
 1005         } else {
 1006                 a[0] = LINUX_LDT_entry_a(&info);
 1007                 a[1] = LINUX_LDT_entry_b(&info);
 1008         }
 1009 
 1010         memcpy(&sd, &a, sizeof(a));
 1011 #ifdef DEBUG
 1012         if (ldebug(set_thread_area))
 1013                 printf("Segment created in set_thread_area: "
 1014                     "lobase: %x, hibase: %x, lolimit: %x, hilimit: %x, "
 1015                     "type: %i, dpl: %i, p: %i, xx: %i, long: %i, "
 1016                     "def32: %i, gran: %i\n",
 1017                     sd.sd_lobase,
 1018                     sd.sd_hibase,
 1019                     sd.sd_lolimit,
 1020                     sd.sd_hilimit,
 1021                     sd.sd_type,
 1022                     sd.sd_dpl,
 1023                     sd.sd_p,
 1024                     sd.sd_xx,
 1025                     sd.sd_long,
 1026                     sd.sd_def32,
 1027                     sd.sd_gran);
 1028 #endif
 1029 
 1030         pcb = td->td_pcb;
 1031         pcb->pcb_gsbase = (register_t)info.base_addr;
 1032         set_pcb_flags(pcb, PCB_32BIT);
 1033         update_gdt_gsbase(td, info.base_addr);
 1034 
 1035         return (0);
 1036 }
 1037 
 1038 int
 1039 linux_wait4(struct thread *td, struct linux_wait4_args *args)
 1040 {
 1041         int error, options;
 1042         struct rusage ru, *rup;
 1043         struct l_rusage lru;
 1044 
 1045 #ifdef DEBUG
 1046         if (ldebug(wait4))
 1047                 printf(ARGS(wait4, "%d, %p, %d, %p"),
 1048                     args->pid, (void *)args->status, args->options,
 1049                     (void *)args->rusage);
 1050 #endif
 1051 
 1052         options = (args->options & (WNOHANG | WUNTRACED));
 1053         /* WLINUXCLONE should be equal to __WCLONE, but we make sure */
 1054         if (args->options & __WCLONE)
 1055                 options |= WLINUXCLONE;
 1056 
 1057         if (args->rusage != NULL)
 1058                 rup = &ru;
 1059         else
 1060                 rup = NULL;
 1061         error = linux_common_wait(td, args->pid, args->status, options, rup);
 1062         if (error)
 1063                 return (error);
 1064         if (args->rusage != NULL) {
 1065                 bsd_to_linux_rusage(rup, &lru);
 1066                 error = copyout(&lru, args->rusage, sizeof(lru));
 1067         }
 1068 
 1069         return (error);
 1070 }
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FreeBSD/Linux Kernel Cross Reference sys/amd64/linux32/linux32_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/linux32/linux32_machdep.c
