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 /*
   28  * $FreeBSD: releng/5.1/sys/kern/kern_context.c 113998 2003-04-25 01:50:30Z deischen $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/lock.h>
   34 #include <sys/mutex.h>
   35 #include <sys/proc.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
   44  * the machine context.  The next field is uc_link; we want to
   45  * avoid destroying the link 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 /*
   63  * MPSAFE
   64  */
   65 int
   66 getcontext(struct thread *td, struct getcontext_args *uap)
   67 {
   68         ucontext_t uc;
   69         int ret;
   70 
   71         if (uap->ucp == NULL)
   72                 ret = EINVAL;
   73         else {
   74                 get_mcontext(td, &uc.uc_mcontext, 1);
   75                 PROC_LOCK(td->td_proc);
   76                 uc.uc_sigmask = td->td_sigmask;
   77                 PROC_UNLOCK(td->td_proc);
   78                 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
   79         }
   80         return (ret);
   81 }
   82 
   83 /*
   84  * MPSAFE
   85  */
   86 int
   87 setcontext(struct thread *td, struct setcontext_args *uap)
   88 {
   89         ucontext_t uc;
   90         int ret;        
   91 
   92         if (uap->ucp == NULL)
   93                 ret = EINVAL;
   94         else {
   95                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   96                 if (ret == 0) {
   97                         ret = set_mcontext(td, &uc.uc_mcontext);
   98                         if (ret == 0) {
   99                                 SIG_CANTMASK(uc.uc_sigmask);
  100                                 PROC_LOCK(td->td_proc);
  101                                 td->td_sigmask = uc.uc_sigmask;
  102                                 PROC_UNLOCK(td->td_proc);
  103                         }
  104                 }
  105         }
  106         return (ret == 0 ? EJUSTRETURN : ret);
  107 }
  108 
  109 int
  110 swapcontext(struct thread *td, struct swapcontext_args *uap)
  111 {
  112         ucontext_t uc;
  113         int ret;        
  114 
  115         if (uap->oucp == NULL || uap->ucp == NULL)
  116                 ret = EINVAL;
  117         else {
  118                 get_mcontext(td, &uc.uc_mcontext, 1);
  119                 PROC_LOCK(td->td_proc);
  120                 uc.uc_sigmask = td->td_sigmask;
  121                 PROC_UNLOCK(td->td_proc);
  122                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  123                 if (ret == 0) {
  124                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  125                         if (ret == 0) {
  126                                 ret = set_mcontext(td, &uc.uc_mcontext);
  127                                 if (ret == 0) {
  128                                         SIG_CANTMASK(uc.uc_sigmask);
  129                                         PROC_LOCK(td->td_proc);
  130                                         td->td_sigmask = uc.uc_sigmask;
  131                                         PROC_UNLOCK(td->td_proc);
  132                                 }
  133                         }
  134                 }
  135         }
  136         return (ret == 0 ? EJUSTRETURN : ret);
  137 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_context.c

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sys/kern/kern_context.c