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/alpha/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  * $FreeBSD: releng/5.1/sys/alpha/linux/linux_machdep.c 113859 2003-04-22 18:23:49Z jhb $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/lock.h>
   34 #include <sys/mman.h>
   35 #include <sys/mount.h>
   36 #include <sys/mutex.h>
   37 #include <sys/proc.h>
   38 #include <sys/syscallsubr.h>
   39 #include <sys/sysproto.h>
   40 #include <sys/unistd.h>
   41 #include <sys/user.h>
   42 
   43 #include <vm/vm.h>
   44 #include <vm/pmap.h>
   45 #include <vm/vm_map.h>
   46 
   47 #include <alpha/linux/linux.h>
   48 #include <alpha/linux/linux_proto.h>
   49 #include <compat/linux/linux_signal.h>
   50 #include <compat/linux/linux_util.h>
   51 
   52 struct linux_select_argv {
   53         int nfds;
   54         fd_set *readfds;
   55         fd_set *writefds;
   56         fd_set *exceptfds;
   57         struct timeval *timeout;
   58 };
   59 
   60 int
   61 linux_execve(struct thread *td, struct linux_execve_args *args)
   62 {
   63         struct execve_args bsd;
   64         caddr_t sg;
   65 
   66         sg = stackgap_init();
   67         CHECKALTEXIST(td, &sg, args->path);
   68 
   69 #ifdef DEBUG
   70         if (ldebug(execve))
   71                 printf(ARGS(execve, "%s"), args->path);
   72 #endif
   73         bsd.fname = args->path;
   74         bsd.argv = args->argp;
   75         bsd.envv = args->envp;
   76         return (execve(td, &bsd));
   77 }
   78 
   79 /*
   80  * MPSAFE
   81  */
   82 int
   83 linux_fork(struct thread *td, struct linux_fork_args *args)
   84 {
   85         int error;
   86 
   87 #ifdef DEBUG
   88         if (ldebug(fork))
   89                 printf(ARGS(fork, ""));
   90 #endif
   91         if ((error = fork(td, (struct fork_args *)args)) != 0)
   92                 return (error);
   93 
   94         if (td->td_retval[1] == 1)
   95                 td->td_retval[0] = 0;
   96 
   97         return (0);
   98 }
   99 
  100 /*
  101  * MPSAFE
  102  */
  103 int
  104 linux_vfork(struct thread *td, struct linux_vfork_args *args)
  105 {
  106         int error;
  107 
  108 #ifdef DEBUG
  109         if (ldebug(vfork))
  110                 printf(ARGS(vfork, ""));
  111 #endif
  112         if ((error = vfork(td, (struct vfork_args *)args)) != 0)
  113                 return (error);
  114         /* Are we the child? */
  115         if (td->td_retval[1] == 1)
  116                 td->td_retval[0] = 0;
  117         return (0);
  118 }
  119 
  120 #define CLONE_VM        0x100
  121 #define CLONE_FS        0x200
  122 #define CLONE_FILES     0x400
  123 #define CLONE_SIGHAND   0x800
  124 #define CLONE_PID       0x1000
  125 
  126 int
  127 linux_clone(struct thread *td, struct linux_clone_args *args)
  128 {
  129         int error, ff = RFPROC | RFSTOPPED;
  130         struct proc *p2;
  131         struct thread *td2;
  132         int exit_signal;
  133 
  134 #ifdef DEBUG
  135         if (ldebug(clone)) {
  136                 printf(ARGS(clone, "flags %x, stack %p"),
  137                     (unsigned int)args->flags, args->stack);
  138                 if (args->flags & CLONE_PID)
  139                     printf(LMSG("CLONE_PID not yet supported"));
  140         }
  141 #endif
  142 
  143         if (!args->stack)
  144                 return (EINVAL);
  145 
  146         exit_signal = args->flags & 0x000000ff;
  147         if (exit_signal >= LINUX_NSIG)
  148                 return (EINVAL);
  149 
  150 /*      if (exit_signal <= LINUX_SIGTBLSZ)
  151                 exit_signal = linux_to_bsd_signal[_SIG_IDX(exit_signal)];
  152 */
  153 
  154         if (args->flags & CLONE_VM)
  155                 ff |= RFMEM;
  156         if (args->flags & CLONE_SIGHAND)
  157                 ff |= RFSIGSHARE;
  158         if (!(args->flags & CLONE_FILES))
  159                 ff |= RFFDG;
  160 
  161         error = fork1(td, ff, 0, &p2);
  162         if (error)
  163                 return (error);
  164 
  165         PROC_LOCK(p2);
  166         p2->p_sigparent = exit_signal;
  167         PROC_UNLOCK(p2);
  168         td2 = FIRST_THREAD_IN_PROC(p2);
  169         td2->td_pcb->pcb_hw.apcb_usp = (unsigned long)args->stack;
  170 
  171 #ifdef DEBUG
  172         if (ldebug(clone))
  173                 printf(LMSG("clone: successful rfork to %ld, stack %p sig = %d"),
  174                     (long)p2->p_pid, args->stack, exit_signal);
  175 #endif
  176 
  177         /*
  178          * Make this runnable after we are finished with it.
  179          */
  180         mtx_lock_spin(&sched_lock);
  181         TD_SET_CAN_RUN(td2);
  182         setrunqueue(td2);
  183         mtx_unlock_spin(&sched_lock);
  184 
  185         td->td_retval[0] = p2->p_pid;
  186         td->td_retval[1] = 0;
  187         return (0);
  188 }
  189 
  190 #define STACK_SIZE  (2 * 1024 * 1024)
  191 #define GUARD_SIZE  (4 * PAGE_SIZE)
  192 
  193 int
  194 linux_mmap(struct thread *td, struct linux_mmap_args *linux_args)
  195 {
  196         struct mmap_args /* {
  197                 caddr_t addr;
  198                 size_t len;
  199                 int prot;
  200                 int flags;
  201                 int fd;
  202                 long pad;
  203                 off_t pos;
  204         } */ bsd_args;
  205         int error;
  206 
  207 #ifdef DEBUG
  208         if (ldebug(mmap))
  209                 printf(ARGS(mmap, "%p, 0x%lx, 0x%lx, 0x%lx, 0x%lx, 0x%lx"),
  210                     (void *)linux_args->addr, linux_args->len,
  211                     linux_args->prot, linux_args->flags, linux_args->fd,
  212                     linux_args->pos);
  213 #endif
  214         bsd_args.prot = linux_args->prot | PROT_READ;   /* always required */
  215 
  216         bsd_args.flags = 0;
  217         if (linux_args->flags & LINUX_MAP_SHARED)
  218                 bsd_args.flags |= MAP_SHARED;
  219         if (linux_args->flags & LINUX_MAP_PRIVATE)
  220                 bsd_args.flags |= MAP_PRIVATE;
  221         if (linux_args->flags & LINUX_MAP_FIXED){
  222                 bsd_args.flags |= MAP_FIXED;
  223                 bsd_args.pos = trunc_page(linux_args->pos);
  224         } else {
  225                 bsd_args.pos = linux_args->pos;
  226         }
  227         if (linux_args->flags & LINUX_MAP_ANON)
  228                 bsd_args.flags |= MAP_ANON;
  229         if (linux_args->flags & LINUX_MAP_GROWSDOWN) {
  230                 bsd_args.flags |= MAP_STACK;
  231 
  232                 /* The linux MAP_GROWSDOWN option does not limit auto
  233                  * growth of the region.  Linux mmap with this option
  234                  * takes as addr the inital BOS, and as len, the initial
  235                  * region size.  It can then grow down from addr without
  236                  * limit.  However, linux threads has an implicit internal
  237                  * limit to stack size of STACK_SIZE.  Its just not
  238                  * enforced explicitly in linux.  But, here we impose
  239                  * a limit of (STACK_SIZE - GUARD_SIZE) on the stack
  240                  * region, since we can do this with our mmap.
  241                  *
  242                  * Our mmap with MAP_STACK takes addr as the maximum
  243                  * downsize limit on BOS, and as len the max size of
  244                  * the region.  It them maps the top SGROWSIZ bytes,
  245                  * and autgrows the region down, up to the limit
  246                  * in addr.
  247                  *
  248                  * If we don't use the MAP_STACK option, the effect
  249                  * of this code is to allocate a stack region of a
  250                  * fixed size of (STACK_SIZE - GUARD_SIZE).
  251                  */
  252 
  253                 /* This gives us TOS */
  254                 bsd_args.addr = (caddr_t)(linux_args->addr + linux_args->len);
  255 
  256                 /* This gives us our maximum stack size */
  257                 if (linux_args->len > STACK_SIZE - GUARD_SIZE)
  258                         bsd_args.len = linux_args->len;
  259                 else
  260                         bsd_args.len  = STACK_SIZE - GUARD_SIZE;
  261 
  262                 /* This gives us a new BOS.  If we're using VM_STACK, then
  263                  * mmap will just map the top SGROWSIZ bytes, and let
  264                  * the stack grow down to the limit at BOS.  If we're
  265                  * not using VM_STACK we map the full stack, since we
  266                  * don't have a way to autogrow it.
  267                  */
  268                 bsd_args.addr -= bsd_args.len;
  269                 bsd_args.addr = (caddr_t)round_page(bsd_args.addr); /* XXXX */
  270         } else {
  271                 bsd_args.addr = (caddr_t)linux_args->addr;
  272                 bsd_args.len  = linux_args->len;
  273         }
  274 
  275         bsd_args.fd = linux_args->fd;
  276         if(linux_args->fd == 0)
  277                 bsd_args.fd = -1;
  278 
  279         bsd_args.pad = 0;
  280 #ifdef DEBUG
  281         if (ldebug(mmap))
  282                 printf(ARGS(mmap, "%p, 0x%lx, 0x%x, 0x%x, 0x%x, 0x%lx"),
  283                     (void *)bsd_args.addr,
  284                     bsd_args.len,
  285                     bsd_args.prot,
  286                     bsd_args.flags,
  287                     bsd_args.fd,
  288                     bsd_args.pos);
  289 #endif
  290         if (bsd_args.addr == 0)
  291                 bsd_args.addr = (caddr_t)0x40000000UL;
  292         error = mmap(td, &bsd_args);
  293 #ifdef DEBUG
  294         if (ldebug(mmap))
  295                 printf(LMSG("mmap returns %d, 0x%lx"), error, td->td_retval[0]);
  296 #endif
  297         return (error);
  298 }
  299 
  300 int
  301 linux_rt_sigsuspend(td, uap)
  302         struct thread *td;
  303         struct linux_rt_sigsuspend_args *uap;
  304 {
  305         int error;
  306         l_sigset_t lmask;
  307         sigset_t bmask;
  308 
  309 #ifdef DEBUG
  310         if (ldebug(rt_sigsuspend))
  311                 printf(ARGS(rt_sigsuspend, "%p, %zd"),
  312                     (void *)uap->newset, uap->sigsetsize);
  313 #endif
  314         if (uap->sigsetsize != sizeof(l_sigset_t))
  315                 return (EINVAL);
  316 
  317         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
  318         if (error)
  319                 return (error);
  320 
  321         linux_to_bsd_sigset(&lmask, &bmask);
  322         return (kern_sigsuspend(td, bmask));
  323 }
  324 
  325 int
  326 linux_mprotect(td, uap)
  327         struct thread *td;
  328         struct linux_mprotect_args *uap;
  329 {
  330 
  331 #ifdef DEBUG
  332         if (ldebug(mprotect))
  333                 printf(ARGS(mprotect, "%p, 0x%zx, 0x%lx"),
  334                     (void *)uap->addr, uap->len, uap->prot);
  335 #endif
  336         return (mprotect(td, (void *)uap));
  337 }
  338 
  339 int
  340 linux_munmap(td, uap)
  341         struct thread *td;
  342         struct linux_munmap_args *uap;
  343 {
  344 
  345 #ifdef DEBUG
  346         if (ldebug(munmap))
  347                 printf(ARGS(munmap, "%p, 0x%lx"),
  348                     (void *)uap->addr, uap->len);
  349 #endif
  350         return (munmap(td, (void *)uap));
  351 }
  352 
  353 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
  354         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
  355         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NOFILE, -1,
  356         RLIMIT_NPROC, RLIMIT_MEMLOCK
  357 };
  358 
  359 int
  360 linux_setrlimit(td, uap)
  361         struct thread *td;
  362         struct linux_setrlimit_args *uap;
  363 {
  364         struct rlimit rlim;
  365         u_int which;
  366         int error;
  367 
  368 #ifdef DEBUG
  369         if (ldebug(setrlimit))
  370                 printf(ARGS(setrlimit, "%d, %p"),
  371                     uap->resource, (void *)uap->rlim);
  372 #endif
  373         if (uap->resource >= LINUX_RLIM_NLIMITS)
  374                 return EINVAL;
  375 
  376         which = linux_to_bsd_resource[uap->resource];
  377 
  378         if (which == -1)
  379                 return EINVAL;
  380 
  381         if ((error =
  382            copyin(uap->rlim, &rlim, sizeof (struct rlimit))))
  383                 return (error);
  384         return dosetrlimit(td,  which, &rlim);
  385 }
  386 
  387 int
  388 linux_getrlimit(td, uap)
  389         struct thread *td;
  390         struct linux_getrlimit_args *uap;
  391 {
  392         u_int which;
  393 
  394 #ifdef DEBUG
  395         if (ldebug(getrlimit))
  396                 printf(ARGS(getrlimit, "%d, %p"),
  397                     uap->resource, (void *)uap->rlim);
  398 #endif
  399         if (uap->resource >= LINUX_RLIM_NLIMITS)
  400                 return EINVAL;
  401 
  402         which = linux_to_bsd_resource[uap->resource];
  403 
  404         if (which == -1)
  405                 return EINVAL;
  406 
  407         return (copyout(&td->td_proc->p_rlimit[which],
  408             uap->rlim, sizeof (struct rlimit)));
  409 }

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