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/5.0/sys/alpha/linux/linux_machdep.c 104373 2002-10-02 14:30:14Z gallatin $
   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/sysproto.h>
   39 #include <sys/unistd.h>
   40 #include <sys/user.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/pmap.h>
   44 #include <vm/vm_map.h>
   45 
   46 #include <alpha/linux/linux.h>
   47 #include <alpha/linux/linux_proto.h>
   48 #include <compat/linux/linux_signal.h>
   49 #include <compat/linux/linux_util.h>
   50 
   51 struct linux_select_argv {
   52         int nfds;
   53         fd_set *readfds;
   54         fd_set *writefds;
   55         fd_set *exceptfds;
   56         struct timeval *timeout;
   57 };
   58 
   59 int
   60 linux_execve(struct thread *td, struct linux_execve_args *args)
   61 {
   62         struct execve_args bsd;
   63         caddr_t sg;
   64 
   65         sg = stackgap_init();
   66         CHECKALTEXIST(td, &sg, args->path);
   67 
   68 #ifdef DEBUG
   69         if (ldebug(execve))
   70                 printf(ARGS(execve, "%s"), args->path);
   71 #endif
   72         bsd.fname = args->path;
   73         bsd.argv = args->argp;
   74         bsd.envv = args->envp;
   75         return (execve(td, &bsd));
   76 }
   77 
   78 /*
   79  * MPSAFE
   80  */
   81 int
   82 linux_fork(struct thread *td, struct linux_fork_args *args)
   83 {
   84         int error;
   85 
   86 #ifdef DEBUG
   87         if (ldebug(fork))
   88                 printf(ARGS(fork, ""));
   89 #endif
   90         if ((error = fork(td, (struct fork_args *)args)) != 0)
   91                 return (error);
   92 
   93         if (td->td_retval[1] == 1)
   94                 td->td_retval[0] = 0;
   95 
   96         return (0);
   97 }
   98 
   99 /*
  100  * MPSAFE
  101  */
  102 int
  103 linux_vfork(struct thread *td, struct linux_vfork_args *args)
  104 {
  105         int error;
  106 
  107 #ifdef DEBUG
  108         if (ldebug(vfork))
  109                 printf(ARGS(vfork, ""));
  110 #endif
  111         if ((error = vfork(td, (struct vfork_args *)args)) != 0)
  112                 return (error);
  113         /* Are we the child? */
  114         if (td->td_retval[1] == 1)
  115                 td->td_retval[0] = 0;
  116         return (0);
  117 }
  118 
  119 #define CLONE_VM        0x100
  120 #define CLONE_FS        0x200
  121 #define CLONE_FILES     0x400
  122 #define CLONE_SIGHAND   0x800
  123 #define CLONE_PID       0x1000
  124 
  125 int
  126 linux_clone(struct thread *td, struct linux_clone_args *args)
  127 {
  128         int error, ff = RFPROC | RFSTOPPED;
  129         struct proc *p2;
  130         struct thread *td2;
  131         int exit_signal;
  132         vm_offset_t start;
  133 
  134 #ifdef DEBUG
  135         if (ldebug(clone)) {
  136                 printf(ARGS(clone, "flags %x, stack %x"), 
  137                     (unsigned int)args->flags, (unsigned int)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 = 0;
  162         start = 0;
  163 
  164         if ((error = fork1(td, ff, 0, &p2)) != 0)
  165                 return (error);
  166 
  167         PROC_LOCK(p2);
  168         p2->p_sigparent = exit_signal;
  169         PROC_UNLOCK(p2);
  170         td2 = FIRST_THREAD_IN_PROC(p2);
  171         td2->td_pcb->pcb_hw.apcb_usp = (unsigned long)args->stack;
  172 
  173 #ifdef DEBUG
  174         if (ldebug(clone))
  175                 printf(LMSG("clone: successful rfork to %ld, stack %p sig = %d"),
  176                     (long)p2->p_pid, args->stack, exit_signal);
  177 #endif
  178 
  179         /*
  180          * Make this runnable after we are finished with it.
  181          */
  182         mtx_lock_spin(&sched_lock);
  183         TD_SET_CAN_RUN(td2);
  184         setrunqueue(FIRST_THREAD_IN_PROC(p2));
  185         mtx_unlock_spin(&sched_lock);
  186 
  187         td->td_retval[0] = p2->p_pid;
  188         td->td_retval[1] = 0;
  189         return (0);
  190 }
  191 
  192 #define STACK_SIZE  (2 * 1024 * 1024)
  193 #define GUARD_SIZE  (4 * PAGE_SIZE)
  194 
  195 int
  196 linux_mmap(struct thread *td, struct linux_mmap_args *linux_args)
  197 {
  198         struct mmap_args /* {
  199                 caddr_t addr;
  200                 size_t len;
  201                 int prot;
  202                 int flags;
  203                 int fd;
  204                 long pad;
  205                 off_t pos;
  206         } */ bsd_args;
  207         int error;
  208 
  209 #ifdef DEBUG
  210         if (ldebug(mmap))
  211                 printf(ARGS(mmap, "%p, 0x%lx, 0x%x, 0x%x, 0x%x, 0x%lx"),
  212                     (void *)linux_args->addr, linux_args->len,
  213                     linux_args->prot, linux_args->flags, linux_args->fd,
  214                     linux_args->pos);
  215 #endif
  216         bsd_args.prot = linux_args->prot | PROT_READ;   /* always required */
  217 
  218         bsd_args.flags = 0;
  219         if (linux_args->flags & LINUX_MAP_SHARED)
  220                 bsd_args.flags |= MAP_SHARED;
  221         if (linux_args->flags & LINUX_MAP_PRIVATE)
  222                 bsd_args.flags |= MAP_PRIVATE;
  223         if (linux_args->flags & LINUX_MAP_FIXED){
  224                 bsd_args.flags |= MAP_FIXED;
  225                 bsd_args.pos = trunc_page(linux_args->pos);
  226         } else {
  227                 bsd_args.pos = linux_args->pos;
  228         }
  229         if (linux_args->flags & LINUX_MAP_ANON)
  230                 bsd_args.flags |= MAP_ANON;
  231         if (linux_args->flags & LINUX_MAP_GROWSDOWN) {
  232                 bsd_args.flags |= MAP_STACK;
  233 
  234                 /* The linux MAP_GROWSDOWN option does not limit auto
  235                  * growth of the region.  Linux mmap with this option
  236                  * takes as addr the inital BOS, and as len, the initial
  237                  * region size.  It can then grow down from addr without
  238                  * limit.  However, linux threads has an implicit internal
  239                  * limit to stack size of STACK_SIZE.  Its just not
  240                  * enforced explicitly in linux.  But, here we impose
  241                  * a limit of (STACK_SIZE - GUARD_SIZE) on the stack
  242                  * region, since we can do this with our mmap.
  243                  *
  244                  * Our mmap with MAP_STACK takes addr as the maximum
  245                  * downsize limit on BOS, and as len the max size of
  246                  * the region.  It them maps the top SGROWSIZ bytes,
  247                  * and autgrows the region down, up to the limit
  248                  * in addr.
  249                  *
  250                  * If we don't use the MAP_STACK option, the effect
  251                  * of this code is to allocate a stack region of a
  252                  * fixed size of (STACK_SIZE - GUARD_SIZE).
  253                  */
  254 
  255                 /* This gives us TOS */
  256                 bsd_args.addr = (caddr_t)(linux_args->addr + linux_args->len);
  257 
  258                 /* This gives us our maximum stack size */
  259                 if (linux_args->len > STACK_SIZE - GUARD_SIZE)
  260                         bsd_args.len = linux_args->len;
  261                 else
  262                         bsd_args.len  = STACK_SIZE - GUARD_SIZE;
  263 
  264                 /* This gives us a new BOS.  If we're using VM_STACK, then
  265                  * mmap will just map the top SGROWSIZ bytes, and let
  266                  * the stack grow down to the limit at BOS.  If we're
  267                  * not using VM_STACK we map the full stack, since we
  268                  * don't have a way to autogrow it.
  269                  */
  270                 bsd_args.addr -= bsd_args.len;
  271                 bsd_args.addr = (caddr_t)round_page(bsd_args.addr); /* XXXX */
  272         } else {
  273                 bsd_args.addr = (caddr_t)linux_args->addr;
  274                 bsd_args.len  = linux_args->len;
  275         }
  276 
  277         bsd_args.fd = linux_args->fd;
  278         if(linux_args->fd == 0)
  279                 bsd_args.fd = -1;
  280 
  281         bsd_args.pad = 0;
  282 #ifdef DEBUG
  283         if (ldebug(mmap))
  284                 printf(ARGS(mmap, "%p, 0x%lx, 0x%x, 0x%x, 0x%x, 0x%lx)",
  285                     (void *)bsd_args.addr,
  286                     bsd_args.len,
  287                     bsd_args.prot,
  288                     bsd_args.flags,
  289                     bsd_args.fd,
  290                     bsd_args.pos);
  291 #endif
  292         if (bsd_args.addr == 0)
  293                 bsd_args.addr = (caddr_t)0x40000000UL;
  294         error = mmap(td, &bsd_args);
  295 #ifdef DEBUG
  296         if (ldebug(mmap))
  297                 printf(LMSG("mmap returns %d, 0x%lx", error, td->td_retval[0]);
  298 #endif
  299         return (error);
  300 }
  301 
  302 int
  303 linux_rt_sigsuspend(td, uap)
  304         struct thread *td;
  305         struct linux_rt_sigsuspend_args *uap;
  306 {
  307         int error;
  308         l_sigset_t lmask;
  309         sigset_t *bmask;
  310         struct sigsuspend_args bsd;
  311         caddr_t sg;
  312 
  313         sg = stackgap_init();
  314 
  315 #ifdef DEBUG
  316         if (ldebug(rt_sigsuspend))
  317                 printf(ARGS(rt_sigsuspend, "%p, %d"),
  318                     (void *)uap->newset, uap->sigsetsize);
  319 #endif
  320         if (uap->sigsetsize != sizeof(l_sigset_t))
  321                 return (EINVAL);
  322 
  323         error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
  324         if (error)
  325                 return (error);
  326 
  327         bmask = stackgap_alloc(&sg, sizeof(sigset_t));
  328         linux_to_bsd_sigset(&lmask, bmask);
  329         bsd.sigmask = bmask;
  330         return (sigsuspend(td, &bsd));
  331 }
  332 
  333 int
  334 linux_mprotect(td, uap)
  335         struct thread *td;
  336         struct linux_mprotect_args *uap;
  337 {
  338 
  339 #ifdef DEBUG
  340         if (ldebug(mprotect))
  341                 printf(ARGS(mprotect, "%p, 0x%lx, 0x%x)",
  342                     (void *)uap->addr, uap->len, uap->prot);
  343 #endif
  344         return (mprotect(td, (void *)uap));
  345 }
  346 
  347 int
  348 linux_munmap(td, uap)
  349         struct thread *td;
  350         struct linux_munmap_args *uap;
  351 {
  352 
  353 #ifdef DEBUG
  354         if (ldebug(munmap))
  355                 printf(ARGS(munmap, "%p, 0x%lx",
  356                     (void *)uap->addr, uap->len);
  357 #endif
  358         return (munmap(td, (void *)uap));
  359 }
  360 
  361 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = {
  362         RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK,
  363         RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NOFILE, -1,
  364         RLIMIT_NPROC, RLIMIT_MEMLOCK
  365 };
  366 
  367 int
  368 linux_setrlimit(td, uap)
  369         struct thread *td;
  370         struct linux_setrlimit_args *uap;
  371 {
  372         struct rlimit rlim;
  373         u_int which;
  374         int error;
  375 
  376 #ifdef DEBUG
  377         if (ldebug(setrlimit))
  378                 printf(ARGS(setrlimit, "%d, %p"),
  379                     uap->resource, (void *)uap->rlim);
  380 #endif
  381         if (uap->resource >= LINUX_RLIM_NLIMITS)
  382                 return EINVAL;
  383 
  384         which = linux_to_bsd_resource[uap->resource];
  385 
  386         if (which == -1)
  387                 return EINVAL;
  388 
  389         if ((error =
  390            copyin((caddr_t)uap->rlim, (caddr_t)&rlim, sizeof (struct rlimit))))
  391                 return (error);
  392         return dosetrlimit(td,  which, &rlim);
  393 }
  394 
  395 int
  396 linux_getrlimit(td, uap)
  397         struct thread *td;
  398         struct linux_getrlimit_args *uap;
  399 {
  400         u_int which;
  401 
  402 #ifdef DEBUG
  403         if (ldebug(getrlimit))
  404                 printf(ARGS(getrlimit, "%d, %p"),
  405                     uap->resource, (void *)uap->rlim);
  406 #endif
  407         if (uap->resource >= LINUX_RLIM_NLIMITS)
  408                 return EINVAL;
  409 
  410         which = linux_to_bsd_resource[uap->resource];
  411 
  412         if (which == -1)
  413                 return EINVAL;
  414 
  415         return (copyout((caddr_t)&td->td_proc->p_rlimit[which],
  416             (caddr_t)uap->rlim, sizeof (struct rlimit)));
  417 }

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