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: releng/8.0/sys/kern/kern_context.c 167232 2007-03-05 13:10:58Z rwatson $");
   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 the machine
   43  * context.  The next field is uc_link; we want to avoid destroying the link
   44  * 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 int
   62 getcontext(struct thread *td, struct getcontext_args *uap)
   63 {
   64         ucontext_t uc;
   65         int ret;
   66 
   67         if (uap->ucp == NULL)
   68                 ret = EINVAL;
   69         else {
   70                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
   71                 PROC_LOCK(td->td_proc);
   72                 uc.uc_sigmask = td->td_sigmask;
   73                 PROC_UNLOCK(td->td_proc);
   74                 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
   75         }
   76         return (ret);
   77 }
   78 
   79 int
   80 setcontext(struct thread *td, struct setcontext_args *uap)
   81 {
   82         ucontext_t uc;
   83         int ret;        
   84 
   85         if (uap->ucp == NULL)
   86                 ret = EINVAL;
   87         else {
   88                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   89                 if (ret == 0) {
   90                         ret = set_mcontext(td, &uc.uc_mcontext);
   91                         if (ret == 0) {
   92                                 SIG_CANTMASK(uc.uc_sigmask);
   93                                 PROC_LOCK(td->td_proc);
   94                                 td->td_sigmask = uc.uc_sigmask;
   95                                 PROC_UNLOCK(td->td_proc);
   96                         }
   97                 }
   98         }
   99         return (ret == 0 ? EJUSTRETURN : ret);
  100 }
  101 
  102 int
  103 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                 PROC_LOCK(td->td_proc);
  113                 uc.uc_sigmask = td->td_sigmask;
  114                 PROC_UNLOCK(td->td_proc);
  115                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  116                 if (ret == 0) {
  117                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  118                         if (ret == 0) {
  119                                 ret = set_mcontext(td, &uc.uc_mcontext);
  120                                 if (ret == 0) {
  121                                         SIG_CANTMASK(uc.uc_sigmask);
  122                                         PROC_LOCK(td->td_proc);
  123                                         td->td_sigmask = uc.uc_sigmask;
  124                                         PROC_UNLOCK(td->td_proc);
  125                                 }
  126                         }
  127                 }
  128         }
  129         return (ret == 0 ? EJUSTRETURN : ret);
  130 }

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

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sys/kern/kern_context.c