sys_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    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  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/proc.h>
   40 #include <sys/sysproto.h>
   41 #include <sys/syscall.h>
   42 #include <sys/sysent.h>
   43 
   44 #include <machine/cpufunc.h>
   45 #include <machine/cpuinfo.h>
   46 #include <machine/sysarch.h>
   47 #include <machine/cpuregs.h>
   48 #include <machine/tls.h>
   49 
   50 #ifndef _SYS_SYSPROTO_H_
   51 struct sysarch_args {
   52         int op;
   53         char *parms;
   54 };
   55 #endif
   56 
   57 int
   58 sysarch(struct thread *td, struct sysarch_args *uap)
   59 {
   60         int error;
   61         void *tlsbase;
   62 
   63         switch (uap->op) {
   64         case MIPS_SET_TLS:
   65                 td->td_md.md_tls = uap->parms;
   66 
   67                 /*
   68                  * If there is an user local register implementation (ULRI)
   69                  * update it as well.  Add the TLS and TCB offsets so the
   70                  * value in this register is adjusted like in the case of the
   71                  * rdhwr trap() instruction handler.
   72                  */
   73                 if (cpuinfo.userlocal_reg == true) {
   74                         mips_wr_userlocal((unsigned long)(uap->parms +
   75                             td->td_md.md_tls_tcb_offset));
   76                 }
   77                 return (0);
   78         case MIPS_GET_TLS: 
   79                 tlsbase = td->td_md.md_tls;
   80                 error = copyout(&tlsbase, uap->parms, sizeof(tlsbase));
   81                 return (error);
   82         default:
   83                 break;
   84         }
   85         return (EINVAL);
   86 }

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

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