kern_context.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002 Daniel M. Eischen <deischen@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/proc.h>
   37 #include <sys/syscallsubr.h>
   38 #include <sys/systm.h>
   39 #include <sys/sysproto.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/ucontext.h>
   42 
   43 /*
   44  * The first two fields of a ucontext_t are the signal mask and the machine
   45  * context.  The next field is uc_link; we want to avoid destroying the link
   46  * when copying out contexts.
   47  */
   48 #define UC_COPY_SIZE    offsetof(ucontext_t, uc_link)
   49 
   50 #ifndef _SYS_SYSPROTO_H_
   51 struct getcontext_args {
   52         struct __ucontext *ucp;
   53 }
   54 struct setcontext_args {
   55         const struct __ucontext_t *ucp;
   56 }
   57 struct swapcontext_args {
   58         struct __ucontext *oucp;
   59         const struct __ucontext_t *ucp;
   60 }
   61 #endif
   62 
   63 int
   64 sys_getcontext(struct thread *td, struct getcontext_args *uap)
   65 {
   66         ucontext_t uc;
   67         int ret;
   68 
   69         if (uap->ucp == NULL)
   70                 ret = EINVAL;
   71         else {
   72                 bzero(&uc, sizeof(ucontext_t));
   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 int
   83 sys_setcontext(struct thread *td, struct setcontext_args *uap)
   84 {
   85         ucontext_t uc;
   86         int ret;
   87 
   88         if (uap->ucp == NULL)
   89                 ret = EINVAL;
   90         else {
   91                 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
   92                 if (ret == 0) {
   93                         ret = set_mcontext(td, &uc.uc_mcontext);
   94                         if (ret == 0) {
   95                                 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask,
   96                                     NULL, 0);
   97                         }
   98                 }
   99         }
  100         return (ret == 0 ? EJUSTRETURN : ret);
  101 }
  102 
  103 int
  104 sys_swapcontext(struct thread *td, struct swapcontext_args *uap)
  105 {
  106         ucontext_t uc;
  107         int ret;
  108 
  109         if (uap->oucp == NULL || uap->ucp == NULL)
  110                 ret = EINVAL;
  111         else {
  112                 bzero(&uc, sizeof(ucontext_t));
  113                 get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
  114                 PROC_LOCK(td->td_proc);
  115                 uc.uc_sigmask = td->td_sigmask;
  116                 PROC_UNLOCK(td->td_proc);
  117                 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
  118                 if (ret == 0) {
  119                         ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
  120                         if (ret == 0) {
  121                                 ret = set_mcontext(td, &uc.uc_mcontext);
  122                                 if (ret == 0) {
  123                                         kern_sigprocmask(td, SIG_SETMASK,
  124                                             &uc.uc_sigmask, NULL, 0);
  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

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