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/compat/cloudabi32/cloudabi32_thread.c

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    1 /*-
    2  * Copyright (c) 2015 Nuxi, https://nuxi.nl/
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD$");
   28 
   29 #include <sys/param.h>
   30 #include <sys/proc.h>
   31 #include <sys/systm.h>
   32 
   33 #include <contrib/cloudabi/cloudabi32_types.h>
   34 
   35 #include <compat/cloudabi32/cloudabi32_proto.h>
   36 #include <compat/cloudabi32/cloudabi32_util.h>
   37 
   38 struct thread_create_args {
   39         cloudabi32_threadattr_t attr;
   40         uint32_t tcb;
   41         lwpid_t tid;
   42 };
   43 
   44 static int
   45 initialize_thread(struct thread *td, void *thunk)
   46 {
   47         struct thread_create_args *args = thunk;
   48 
   49         /* Save the thread ID, so it can be returned. */
   50         args->tid = td->td_tid;
   51 
   52         /* Set up initial register contents. */
   53         return (cloudabi32_thread_setregs(td, &args->attr, args->tcb));
   54 }
   55 
   56 int
   57 cloudabi32_sys_thread_create(struct thread *td,
   58     struct cloudabi32_sys_thread_create_args *uap)
   59 {
   60         struct thread_create_args args;
   61         int error;
   62 
   63         error = copyin(uap->attr, &args.attr, sizeof(args.attr));
   64         if (error != 0)
   65                 return (error);
   66 
   67         /* Remove some space on the top of the stack for the TCB. */
   68         args.tcb = rounddown(args.attr.stack + args.attr.stack_len -
   69             sizeof(cloudabi32_tcb_t), _Alignof(cloudabi32_tcb_t));
   70         args.attr.stack_len = args.tcb - args.attr.stack;
   71 
   72         error = thread_create(td, NULL, initialize_thread, &args);
   73         if (error != 0)
   74                 return (error);
   75         td->td_retval[0] = args.tid;
   76         return (0);
   77 }

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