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("$FreeBSD$");
   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/sysent.h>
   36 #include <sys/systm.h>
   37 #include <sys/sysproto.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/ucontext.h>
   40 
   41 /*
   42  * The first two fields of a ucontext_t are the signal mask and
   43  * the machine context.  The next field is uc_link; we want to
   44  * avoid destroying the link when copying out contexts.
   45  */
   46 #define UC_COPY_SIZE    offsetof(ucontext_t, uc_link)
   47 
   48 #ifndef _SYS_SYSPROTO_H_
   49 struct getcontext_args {
   50         struct __ucontext *ucp;
   51 }
   52 struct setcontext_args {
   53         const struct __ucontext_t *ucp;
   54 }
   55 struct swapcontext_args {
   56         struct __ucontext *oucp;
   57         const struct __ucontext_t *ucp;
   58 }
   59 #endif
   60 
   61 /*
   62  * MPSAFE
   63  */
   64 int
   65 getcontext(struct thread *td, struct getcontext_args *uap)
   66 {
   67         ucontext_t uc;
   68         int ret;
   69 
   70         if (uap->ucp == NULL)
   71                 ret = EINVAL;
   72         else {
   73                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
   74                 PROC_LOCK(td->td_proc);
   75                 uc.uc_sigmask = td->td_sigmask;
   76                 PROC_UNLOCK(td->td_proc);
   77                 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
   78         }
   79         return (ret);
   80 }
   81 
   82 /*
   83  * MPSAFE
   84  */
   85 int
   86 setcontext(struct thread *td, struct setcontext_args *uap)
   87 {
   88         ucontext_t uc;
   89         int ret;        
   90 
   91         if (uap->ucp == NULL)
   92                 ret = EINVAL;
   93         else {
   94                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   95                 if (ret == 0) {
   96                         ret = set_mcontext(td, &uc.uc_mcontext);
   97                         if (ret == 0) {
   98                                 SIG_CANTMASK(uc.uc_sigmask);
   99                                 PROC_LOCK(td->td_proc);
  100                                 td->td_sigmask = uc.uc_sigmask;
  101                                 PROC_UNLOCK(td->td_proc);
  102                         }
  103                 }
  104         }
  105         return (ret == 0 ? EJUSTRETURN : ret);
  106 }
  107 
  108 int
  109 swapcontext(struct thread *td, struct swapcontext_args *uap)
  110 {
  111         ucontext_t uc;
  112         int ret;        
  113 
  114         if (uap->oucp == NULL || uap->ucp == NULL)
  115                 ret = EINVAL;
  116         else {
  117                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
  118                 PROC_LOCK(td->td_proc);
  119                 uc.uc_sigmask = td->td_sigmask;
  120                 PROC_UNLOCK(td->td_proc);
  121                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  122                 if (ret == 0) {
  123                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  124                         if (ret == 0) {
  125                                 ret = set_mcontext(td, &uc.uc_mcontext);
  126                                 if (ret == 0) {
  127                                         SIG_CANTMASK(uc.uc_sigmask);
  128                                         PROC_LOCK(td->td_proc);
  129                                         td->td_sigmask = uc.uc_sigmask;
  130                                         PROC_UNLOCK(td->td_proc);
  131                                 }
  132                         }
  133                 }
  134         }
  135         return (ret == 0 ? EJUSTRETURN : ret);
  136 }

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