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: stable/12/sys/mips/mips/sys_machdep.c 325966 2017-11-18 14:26:50Z pfg $");
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
sysarch(struct thread * td,struct sysarch_args * uap)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 }
87