mach_thread.c

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    1 /*      $NetBSD: mach_thread.c,v 1.48 2008/10/15 06:51:19 wrstuden Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 2002-2003 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Emmanuel Dreyfus
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: mach_thread.c,v 1.48 2008/10/15 06:51:19 wrstuden Exp $");
   34 
   35 #include <sys/types.h>
   36 #include <sys/param.h>
   37 #include <sys/kernel.h>
   38 #include <sys/systm.h>
   39 #include <sys/signal.h>
   40 #include <sys/rwlock.h>
   41 #include <sys/queue.h>
   42 #include <sys/proc.h>
   43 #include <sys/resource.h>
   44 #include <sys/resourcevar.h>
   45 #include <sys/sa.h>
   46 #include <sys/savar.h>
   47 
   48 #include <compat/mach/mach_types.h>
   49 #include <compat/mach/mach_message.h>
   50 #include <compat/mach/mach_exec.h>
   51 #include <compat/mach/mach_clock.h>
   52 #include <compat/mach/mach_port.h>
   53 #include <compat/mach/mach_task.h>
   54 #include <compat/mach/mach_thread.h>
   55 #include <compat/mach/mach_errno.h>
   56 #include <compat/mach/mach_services.h>
   57 #include <compat/mach/mach_syscallargs.h>
   58 
   59 int
   60 mach_sys_syscall_thread_switch(struct lwp *l, const struct mach_sys_syscall_thread_switch_args *uap, register_t *retval)
   61 {
   62         /* {
   63                 syscallarg(mach_port_name_t) thread_name;
   64                 syscallarg(int) option;
   65                 syscallarg(mach_msg_timeout_t) option_time;
   66         } */
   67         int timeout;
   68         struct mach_emuldata *med;
   69 
   70         med = (struct mach_emuldata *)l->l_proc->p_emuldata;
   71         timeout = SCARG(uap, option_time) * hz / 1000;
   72 
   73         /*
   74          * The day we will be able to find out the struct proc from
   75          * the port number, try to use preempt() to call the right thread.
   76          * [- but preempt() is for _involuntary_ context switches.]
   77          */
   78         switch(SCARG(uap, option)) {
   79         case MACH_SWITCH_OPTION_NONE:
   80                 yield();
   81                 break;
   82 
   83         case MACH_SWITCH_OPTION_WAIT:
   84                 med->med_thpri = 1;
   85                 while (med->med_thpri != 0)
   86                         (void)tsleep(&med->med_thpri, PZERO|PCATCH,
   87                             "thread_switch", timeout);
   88                 break;
   89 
   90         case MACH_SWITCH_OPTION_DEPRESS:
   91         case MACH_SWITCH_OPTION_IDLE:
   92                 /* Use a callout to restore the priority after depression? */
   93                 med->med_thpri = l->l_priority;
   94                 l->l_priority = MAXPRI;
   95                 break;
   96 
   97         default:
   98                 uprintf("mach_sys_syscall_thread_switch(): unknown option %d\n",                    SCARG(uap, option));
   99                 break;
  100         }
  101         return 0;
  102 }
  103 
  104 int
  105 mach_sys_swtch_pri(struct lwp *l, const struct mach_sys_swtch_pri_args *uap, register_t *retval)
  106 {
  107         /* {
  108                 syscallarg(int) pri;
  109         } */
  110 
  111         /*
  112          * Copied from preempt(9). We cannot just call preempt
  113          * because we want to return mi_switch(9) return value.
  114          */
  115         KERNEL_UNLOCK_ALL(l, &l->l_biglocks);
  116         lwp_lock(l);
  117         if (l->l_stat == LSONPROC)
  118                 l->l_proc->p_stats->p_ru.ru_nivcsw++;   /* XXXSMP */
  119         *retval = mi_switch(l);
  120         KERNEL_LOCK(l->l_biglocks, l);
  121 
  122         return 0;
  123 }
  124 
  125 int
  126 mach_sys_swtch(struct lwp *l, const void *v, register_t *retval)
  127 {
  128         struct mach_sys_swtch_pri_args cup;
  129 
  130         SCARG(&cup, pri) = 0;
  131 
  132         return mach_sys_swtch_pri(l, &cup, retval);
  133 }
  134 
  135 
  136 int
  137 mach_thread_policy(struct mach_trap_args *args)
  138 {
  139         mach_thread_policy_request_t *req = args->smsg;
  140         mach_thread_policy_reply_t *rep = args->rmsg;
  141         size_t *msglen = args->rsize;
  142         int end_offset;
  143 
  144         /* Sanity check req_count */
  145         end_offset = req->req_count +
  146                      (sizeof(req->req_setlimit) / sizeof(req->req_base[0]));
  147         if (MACH_REQMSG_OVERFLOW(args, req->req_base[end_offset]))
  148                 return mach_msg_error(args, EINVAL);
  149 
  150         uprintf("Unimplemented mach_thread_policy\n");
  151 
  152         *msglen = sizeof(*rep);
  153         mach_set_header(rep, req, *msglen);
  154 
  155         rep->rep_retval = 0;
  156 
  157         mach_set_trailer(rep, *msglen);
  158 
  159         return 0;
  160 }
  161 
  162 /* XXX it might be possible to use this on another task */
  163 int
  164 mach_thread_create_running(struct mach_trap_args *args)
  165 {
  166         mach_thread_create_running_request_t *req = args->smsg;
  167         mach_thread_create_running_reply_t *rep = args->rmsg;
  168         size_t *msglen = args->rsize;
  169         struct lwp *l = args->l;
  170         struct proc *p = l->l_proc;
  171         struct mach_create_thread_child_args mctc;
  172         struct mach_right *child_mr;
  173         struct mach_lwp_emuldata *mle;
  174         vaddr_t uaddr;
  175         int flags;
  176         int error;
  177         int inmem;
  178         int end_offset;
  179 
  180         /* Sanity check req_count */
  181         end_offset = req->req_count;
  182         if (MACH_REQMSG_OVERFLOW(args, req->req_state[end_offset]))
  183                 return mach_msg_error(args, EINVAL);
  184 
  185         /*
  186          * Prepare the data we want to transmit to the child.
  187          */
  188         mctc.mctc_flavor = req->req_flavor;
  189         mctc.mctc_oldlwp = l;
  190         mctc.mctc_child_done = 0;
  191         mctc.mctc_state = req->req_state;
  192 
  193         inmem = uvm_uarea_alloc(&uaddr);
  194         if (__predict_false(uaddr == 0))
  195                 return (ENOMEM);
  196 
  197         flags = 0;
  198         if ((error = lwp_create(l, p, uaddr, inmem, flags, NULL, 0,
  199             mach_create_thread_child, (void *)&mctc, &mctc.mctc_lwp,
  200             SCHED_OTHER)) != 0)
  201         {
  202                 uvm_uarea_free(uaddr, curcpu());
  203                 return mach_msg_error(args, error);
  204         }
  205 
  206         /*
  207          * Make the child runnable.
  208          */
  209         mutex_enter(p->p_lock);
  210         lwp_lock(mctc.mctc_lwp);
  211         mctc.mctc_lwp->l_private = 0;
  212         mctc.mctc_lwp->l_stat = LSRUN;
  213         sched_enqueue(mctc.mctc_lwp, false);
  214         p->p_nrlwps++;
  215         lwp_unlock(mctc.mctc_lwp);
  216         mutex_exit(p->p_lock);
  217 
  218         /*
  219          * Get the child's kernel port
  220          */
  221         mle = mctc.mctc_lwp->l_emuldata;
  222         child_mr = mach_right_get(mle->mle_kernel, l, MACH_PORT_TYPE_SEND, 0);
  223 
  224         /*
  225          * The child relies on some values in mctc, so we should not
  226          * exit until it is finished with it. We catch signals so that
  227          * the process can be killed with kill -9, but we loop to avoid
  228          * spurious wakeups due to other signals.
  229          */
  230         while(mctc.mctc_child_done == 0)
  231                 (void)tsleep(&mctc.mctc_child_done,
  232                     PZERO|PCATCH, "mach_thread", 0);
  233 
  234         *msglen = sizeof(*rep);
  235         mach_set_header(rep, req, *msglen);
  236         mach_add_port_desc(rep, child_mr->mr_name);
  237         mach_set_trailer(rep, *msglen);
  238 
  239         return 0;
  240 }
  241 
  242 int
  243 mach_thread_info(struct mach_trap_args *args)
  244 {
  245         mach_thread_info_request_t *req = args->smsg;
  246         mach_thread_info_reply_t *rep = args->rmsg;
  247         size_t *msglen = args->rsize;
  248         struct lwp *l = args->l;
  249         struct lwp *tl = args->tl;
  250         struct proc *tp = tl->l_proc;
  251 
  252         /* Sanity check req->req_count */
  253         if (req->req_count > 12)
  254                 return mach_msg_error(args, EINVAL);
  255 
  256         rep->rep_count = req->req_count;
  257 
  258         *msglen = sizeof(*rep) + ((req->req_count - 12) * sizeof(int));
  259         mach_set_header(rep, req, *msglen);
  260 
  261         switch (req->req_flavor) {
  262         case MACH_THREAD_BASIC_INFO: {
  263                 struct mach_thread_basic_info *tbi;
  264 
  265                 if (req->req_count != (sizeof(*tbi) / sizeof(int))) /* 10 */
  266                         return mach_msg_error(args, EINVAL);
  267 
  268                 tbi = (struct mach_thread_basic_info *)rep->rep_out;
  269                 tbi->user_time.seconds = tp->p_uticks * hz / 1000000;
  270                 tbi->user_time.microseconds =
  271                     (tp->p_uticks) * hz - tbi->user_time.seconds;
  272                 tbi->system_time.seconds = tp->p_sticks * hz / 1000000;
  273                 tbi->system_time.microseconds =
  274                     (tp->p_sticks) * hz - tbi->system_time.seconds;
  275                 tbi->cpu_usage = tp->p_pctcpu;
  276                 tbi->policy = MACH_THREAD_STANDARD_POLICY;
  277 
  278                 /* XXX this is not very accurate */
  279                 tbi->run_state = MACH_TH_STATE_RUNNING;
  280                 tbi->flags = 0;
  281                 switch (l->l_stat) {
  282                 case LSRUN:
  283                         tbi->run_state = MACH_TH_STATE_RUNNING;
  284                         break;
  285                 case LSSTOP:
  286                         tbi->run_state = MACH_TH_STATE_STOPPED;
  287                         break;
  288                 case LSSLEEP:
  289                         tbi->run_state = MACH_TH_STATE_WAITING;
  290                         break;
  291                 case LSIDL:
  292                         tbi->run_state = MACH_TH_STATE_RUNNING;
  293                         tbi->flags = MACH_TH_FLAGS_IDLE;
  294                         break;
  295                 default:
  296                         break;
  297                 }
  298 
  299                 tbi->suspend_count = 0;
  300                 tbi->sleep_time = tl->l_slptime;
  301                 break;
  302         }
  303 
  304         case MACH_THREAD_SCHED_TIMESHARE_INFO: {
  305                 struct mach_policy_timeshare_info *pti;
  306 
  307                 if (req->req_count != (sizeof(*pti) / sizeof(int))) /* 5 */
  308                         return mach_msg_error(args, EINVAL);
  309 
  310                 pti = (struct mach_policy_timeshare_info *)rep->rep_out;
  311 
  312                 pti->max_priority = tl->l_priority;
  313                 pti->base_priority = tl->l_priority;
  314                 pti->cur_priority = tl->l_priority;
  315                 pti->depressed = 0;
  316                 pti->depress_priority = tl->l_priority;
  317                 break;
  318         }
  319 
  320         case MACH_THREAD_SCHED_RR_INFO:
  321         case MACH_THREAD_SCHED_FIFO_INFO:
  322                 uprintf("Unimplemented thread_info flavor %d\n",
  323                     req->req_flavor);
  324         default:
  325                 return mach_msg_error(args, EINVAL);
  326                 break;
  327         }
  328 
  329         mach_set_trailer(rep, *msglen);
  330 
  331         return 0;
  332 }
  333 
  334 int
  335 mach_thread_get_state(struct mach_trap_args *args)
  336 {
  337         mach_thread_get_state_request_t *req = args->smsg;
  338         mach_thread_get_state_reply_t *rep = args->rmsg;
  339         size_t *msglen = args->rsize;
  340         struct lwp *tl = args->tl;
  341         int error;
  342         int size;
  343 
  344         /* Sanity check req->req_count */
  345         if (req->req_count > 144)
  346                 return mach_msg_error(args, EINVAL);
  347 
  348         if ((error = mach_thread_get_state_machdep(tl,
  349             req->req_flavor, &rep->rep_state, &size)) != 0)
  350                 return mach_msg_error(args, error);
  351 
  352         rep->rep_count = size / sizeof(int);
  353         *msglen = sizeof(*rep) + ((req->req_count - 144) * sizeof(int));
  354         mach_set_header(rep, req, *msglen);
  355         mach_set_trailer(rep, *msglen);
  356 
  357         return 0;
  358 }
  359 
  360 int
  361 mach_thread_set_state(struct mach_trap_args *args)
  362 {
  363         mach_thread_set_state_request_t *req = args->smsg;
  364         mach_thread_set_state_reply_t *rep = args->rmsg;
  365         size_t *msglen = args->rsize;
  366         struct lwp *tl = args->tl;
  367         int error;
  368         int end_offset;
  369 
  370         /* Sanity check req_count */
  371         end_offset = req->req_count;
  372         if (MACH_REQMSG_OVERFLOW(args, req->req_state[end_offset]))
  373                 return mach_msg_error(args, EINVAL);
  374 
  375         if ((error = mach_thread_set_state_machdep(tl,
  376             req->req_flavor, &req->req_state)) != 0)
  377                 return mach_msg_error(args, error);
  378 
  379         *msglen = sizeof(*rep);
  380         mach_set_header(rep, req, *msglen);
  381 
  382         rep->rep_retval = 0;
  383 
  384         mach_set_trailer(rep, *msglen);
  385 
  386         return 0;
  387 }
  388 
  389 int
  390 mach_thread_suspend(struct mach_trap_args *args)
  391 {
  392         mach_thread_suspend_request_t *req = args->smsg;
  393         mach_thread_suspend_reply_t *rep = args->rmsg;
  394         size_t *msglen = args->rsize;
  395         struct lwp *l = args->l;
  396         struct lwp *tl = args->tl;
  397         struct proc *p = tl->l_proc;
  398         int error;
  399 
  400         mutex_enter(p->p_lock);
  401         lwp_lock(tl);
  402         error = lwp_suspend(l, tl);
  403         mutex_exit(p->p_lock);
  404 
  405         *msglen = sizeof(*rep);
  406         mach_set_header(rep, req, *msglen);
  407         rep->rep_retval = native_to_mach_errno[error];
  408         mach_set_trailer(rep, *msglen);
  409 
  410         return 0;
  411 }
  412 
  413 int
  414 mach_thread_resume(struct mach_trap_args *args)
  415 {
  416         mach_thread_resume_request_t *req = args->smsg;
  417         mach_thread_resume_reply_t *rep = args->rmsg;
  418         size_t *msglen = args->rsize;
  419         struct lwp *tl = args->tl;
  420         struct proc *p = tl->l_proc;
  421 
  422         mutex_enter(p->p_lock);
  423         lwp_lock(tl);
  424         lwp_continue(tl);
  425         mutex_exit(p->p_lock);
  426 
  427         *msglen = sizeof(*rep);
  428         mach_set_header(rep, req, *msglen);
  429         rep->rep_retval = 0;
  430         mach_set_trailer(rep, *msglen);
  431 
  432         return 0;
  433 }
  434 
  435 int
  436 mach_thread_abort(struct mach_trap_args *args)
  437 {
  438         mach_thread_abort_request_t *req = args->smsg;
  439         mach_thread_abort_reply_t *rep = args->rmsg;
  440         size_t *msglen = args->rsize;
  441         struct lwp *tl = args->tl;
  442 
  443         lwp_exit(tl);
  444 
  445         *msglen = sizeof(*rep);
  446         mach_set_header(rep, req, *msglen);
  447         rep->rep_retval = 0;
  448         mach_set_trailer(rep, *msglen);
  449 
  450         return 0;
  451 }
  452 
  453 int
  454 mach_thread_set_policy(struct mach_trap_args *args)
  455 {
  456         mach_thread_set_policy_request_t *req = args->smsg;
  457         mach_thread_set_policy_reply_t *rep = args->rmsg;
  458         size_t *msglen = args->rsize;
  459         struct lwp *tl = args->tl;
  460         mach_port_t mn;
  461         struct mach_right *mr;
  462         int limit_count_offset, limit_offset;
  463         int limit_count;
  464         int *limit;
  465 
  466         limit_count_offset = req->req_base_count;
  467         if (MACH_REQMSG_OVERFLOW(args, req->req_base[limit_count_offset]))
  468                 return mach_msg_error(args, EINVAL);
  469 
  470         limit_count = req->req_base[limit_count_offset];
  471         limit_offset = limit_count_offset +
  472             (sizeof(req->req_limit_count) / sizeof(req->req_base[0]));
  473         limit = &req->req_base[limit_offset];
  474         if (MACH_REQMSG_OVERFLOW(args, limit[limit_count]))
  475                 return mach_msg_error(args, EINVAL);
  476 
  477         mn = req->req_pset.name;
  478         if ((mr = mach_right_check(mn, tl, MACH_PORT_TYPE_ALL_RIGHTS)) == NULL)
  479                 return mach_msg_error(args, EINVAL);
  480 
  481         *msglen = sizeof(*rep);
  482         mach_set_header(rep, req, *msglen);
  483         rep->rep_retval = 0;
  484         mach_set_trailer(rep, *msglen);
  485 
  486         return 0;
  487 }
  488
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FreeBSD/Linux Kernel Cross Reference sys/compat/mach/mach_thread.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/mach/mach_thread.c
