1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2021 The FreeBSD Foundation 5 * 6 * This software were developed by Konstantin Belousov 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD$"); 33 34#include <sys/types.h> 35#include <string.h> 36#include <stdint.h> 37#include <machine/sysarch.h> 38#include <machine/tls.h> 39 40#include "libc_private.h" 41 42#ifdef __mips_n64 43static void * 44_mips_get_tls(void) 45{ 46 uint64_t _rv; 47 48 __asm__ __volatile__ ( 49 ".set\tpush\n\t" 50 ".set\tmips64r2\n\t" 51 "rdhwr\t%0, $29\n\t" 52 ".set\tpop" 53 : "=r" (_rv)); 54 /* 55 * XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317' 56 * 57 * Remove the offset since this really a request to get the TLS 58 * pointer via sysarch() (in theory). Of course, this may go away 59 * once the TLS code is rewritten. 60 */ 61 _rv = _rv - TLS_TP_OFFSET - TLS_TCB_SIZE; 62 63 return (void *)_rv; 64} 65 66#else /* mips 32 */ 67 68static void * 69_mips_get_tls(void) 70{ 71 uint32_t _rv; 72 73 __asm__ __volatile__ ( 74 ".set\tpush\n\t" 75 ".set\tmips32r2\n\t" 76 "rdhwr\t%0, $29\n\t" 77 ".set\tpop" 78 : "=r" (_rv)); 79 /* 80 * XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317' 81 * 82 * Remove the offset since this really a request to get the TLS 83 * pointer via sysarch() (in theory). Of course, this may go away 84 * once the TLS code is rewritten. 85 */ 86 _rv = _rv - TLS_TP_OFFSET - TLS_TCB_SIZE; 87 88 return (void *)_rv; 89} 90#endif /* ! __mips_n64 */ 91 92void * 93_get_tp(void) 94{ 95 void *res; 96 97#ifdef TLS_USE_SYSARCH 98 sysarch(MIPS_GET_TLS, &res); 99#else 100 res = _mips_get_tls(); 101#endif 102 return (res); 103} 104