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/kern/kern_context.c

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    1 /*-
    2  * Copyright (c) 2002 Daniel M. Eischen <deischen@freebsd.org>
    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  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/10/sys/kern/kern_context.c 225617 2011-09-16 13:58:51Z kmacy $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/lock.h>
   33 #include <sys/mutex.h>
   34 #include <sys/proc.h>
   35 #include <sys/syscallsubr.h>
   36 #include <sys/sysent.h>
   37 #include <sys/systm.h>
   38 #include <sys/sysproto.h>
   39 #include <sys/signalvar.h>
   40 #include <sys/ucontext.h>
   41 
   42 /*
   43  * The first two fields of a ucontext_t are the signal mask and the machine
   44  * context.  The next field is uc_link; we want to avoid destroying the link
   45  * when copying out contexts.
   46  */
   47 #define UC_COPY_SIZE    offsetof(ucontext_t, uc_link)
   48 
   49 #ifndef _SYS_SYSPROTO_H_
   50 struct getcontext_args {
   51         struct __ucontext *ucp;
   52 }
   53 struct setcontext_args {
   54         const struct __ucontext_t *ucp;
   55 }
   56 struct swapcontext_args {
   57         struct __ucontext *oucp;
   58         const struct __ucontext_t *ucp;
   59 }
   60 #endif
   61 
   62 int
   63 sys_getcontext(struct thread *td, struct getcontext_args *uap)
   64 {
   65         ucontext_t uc;
   66         int ret;
   67 
   68         if (uap->ucp == NULL)
   69                 ret = EINVAL;
   70         else {
   71                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
   72                 PROC_LOCK(td->td_proc);
   73                 uc.uc_sigmask = td->td_sigmask;
   74                 PROC_UNLOCK(td->td_proc);
   75                 bzero(uc.__spare__, sizeof(uc.__spare__));
   76                 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
   77         }
   78         return (ret);
   79 }
   80 
   81 int
   82 sys_setcontext(struct thread *td, struct setcontext_args *uap)
   83 {
   84         ucontext_t uc;
   85         int ret;        
   86 
   87         if (uap->ucp == NULL)
   88                 ret = EINVAL;
   89         else {
   90                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   91                 if (ret == 0) {
   92                         ret = set_mcontext(td, &uc.uc_mcontext);
   93                         if (ret == 0) {
   94                                 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
   95                                     NULL, 0);
   96                         }
   97                 }
   98         }
   99         return (ret == 0 ? EJUSTRETURN : ret);
  100 }
  101 
  102 int
  103 sys_swapcontext(struct thread *td, struct swapcontext_args *uap)
  104 {
  105         ucontext_t uc;
  106         int ret;        
  107 
  108         if (uap->oucp == NULL || uap->ucp == NULL)
  109                 ret = EINVAL;
  110         else {
  111                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
  112                 bzero(uc.__spare__, sizeof(uc.__spare__));
  113                 PROC_LOCK(td->td_proc);
  114                 uc.uc_sigmask = td->td_sigmask;
  115                 PROC_UNLOCK(td->td_proc);
  116                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  117                 if (ret == 0) {
  118                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  119                         if (ret == 0) {
  120                                 ret = set_mcontext(td, &uc.uc_mcontext);
  121                                 if (ret == 0) {
  122                                         kern_sigprocmask(td, SIG_SETMASK,
  123                                             &uc.uc_sigmask, NULL, 0);
  124                                 }
  125                         }
  126                 }
  127         }
  128         return (ret == 0 ? EJUSTRETURN : ret);
  129 }

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