FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/sys_machdep.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2001 Jake Burkholder.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include "opt_capsicum.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/capsicum.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/sysproto.h>
    
    #include <machine/md_var.h>
    #include <machine/utrap.h>
    #include <machine/sysarch.h>
    
    static int sparc_sigtramp_install(struct thread *td, char *args);
    static int sparc_utrap_install(struct thread *td, char *args);
    
    #ifndef _SYS_SYSPROTO_H_
    struct sysarch_args {
            int     op;
            char    *parms;
    };
    #endif
    
    int
    sysarch(struct thread *td, struct sysarch_args *uap)
    {
            int error;
    
    #ifdef CAPABILITY_MODE
            /*
             * When adding new operations, add a new case statement here to
             * explicitly indicate whether or not the operation is safe to
             * perform in capability mode.
             */
            if (IN_CAPABILITY_MODE(td)) {
                    switch (uap->op) {
                    case SPARC_SIGTRAMP_INSTALL:
                    case SPARC_UTRAP_INSTALL:
                            break;
    
                    default:
    #ifdef KTRACE
                            if (KTRPOINT(td, KTR_CAPFAIL))
                                    ktrcapfail(CAPFAIL_SYSCALL, NULL, NULL);
    #endif
                            return (ECAPMODE);
                    }
            }
    #endif
    
            mtx_lock(&Giant);
            switch (uap->op) {
            case SPARC_SIGTRAMP_INSTALL:
                    error = sparc_sigtramp_install(td, uap->parms);
                    break;
            case SPARC_UTRAP_INSTALL:
                    error = sparc_utrap_install(td, uap->parms);
                    break;
            default:
                    error = EINVAL;
                    break;
            }
            mtx_unlock(&Giant);
            return (error);
    }
    
    static int
   sparc_sigtramp_install(struct thread *td, char *args)
   {
           struct sparc_sigtramp_install_args sia;
           struct proc *p;
           int error;
   
           p = td->td_proc;
           if ((error = copyin(args, &sia, sizeof(sia))) != 0)
                   return (error);
           if (sia.sia_old != NULL) {
                   if (suword(sia.sia_old, (long)p->p_md.md_sigtramp) != 0)
                           return (EFAULT);
           }
           p->p_md.md_sigtramp = sia.sia_new;
           return (0);
   }
   
   static int
   sparc_utrap_install(struct thread *td, char *args)
   {
           struct sparc_utrap_install_args uia;
           struct sparc_utrap_args ua;
           struct md_utrap *ut;
           int error;
           int i;
   
           ut = td->td_proc->p_md.md_utrap;
           if ((error = copyin(args, &uia, sizeof(uia))) != 0)
                   return (error);
           if (uia.num < 0 || uia.num > UT_MAX ||
               (uia.handlers == NULL && uia.num > 0))
                   return (EINVAL);
           for (i = 0; i < uia.num; i++) {
                   if ((error = copyin(&uia.handlers[i], &ua, sizeof(ua))) != 0)
                           return (error);
                   if (ua.type != UTH_NOCHANGE &&
                       (ua.type < 0 || ua.type >= UT_MAX))
                           return (EINVAL);
                   if (ua.old_deferred != NULL) {
                           if ((error = suword(ua.old_deferred, 0)) != 0)
                                   return (error);
                   }
                   if (ua.old_precise != NULL) {
                           error = suword(ua.old_precise,
                               ut != NULL ? (long)ut->ut_precise[ua.type] : 0);
                           if (error != 0)
                                   return (error);
                   }
                   if (ua.type != UTH_NOCHANGE) {
                           if (ut == NULL) {
                                   ut = utrap_alloc();
                                   td->td_proc->p_md.md_utrap = ut;
                           }
                           ut->ut_precise[ua.type] = ua.new_precise;
                   }
           }
           return (0);
   }

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