06d8a116bd
which returns pointer to tcb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D29623
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021 The FreeBSD Foundation
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*
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* This software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <string.h>
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#include <stdint.h>
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#include <machine/sysarch.h>
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#include <machine/tls.h>
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#include "libc_private.h"
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#ifdef __mips_n64
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static void *
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_mips_get_tls(void)
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{
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uint64_t _rv;
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__asm__ __volatile__ (
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".set\tpush\n\t"
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".set\tmips64r2\n\t"
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"rdhwr\t%0, $29\n\t"
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".set\tpop"
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: "=r" (_rv));
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/*
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* XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317'
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*
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* Remove the offset since this really a request to get the TLS
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* pointer via sysarch() (in theory). Of course, this may go away
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* once the TLS code is rewritten.
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*/
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_rv = _rv - TLS_TP_OFFSET - TLS_TCB_SIZE;
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return (void *)_rv;
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}
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#else /* mips 32 */
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static void *
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_mips_get_tls(void)
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{
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uint32_t _rv;
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__asm__ __volatile__ (
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".set\tpush\n\t"
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".set\tmips32r2\n\t"
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"rdhwr\t%0, $29\n\t"
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".set\tpop"
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: "=r" (_rv));
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/*
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* XXXSS See 'git show c6be4f4d2d1b71c04de5d3bbb6933ce2dbcdb317'
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*
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* Remove the offset since this really a request to get the TLS
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* pointer via sysarch() (in theory). Of course, this may go away
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* once the TLS code is rewritten.
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*/
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_rv = _rv - TLS_TP_OFFSET - TLS_TCB_SIZE;
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return (void *)_rv;
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}
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#endif /* ! __mips_n64 */
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void *
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_get_tp(void)
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{
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void *res;
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#ifdef TLS_USE_SYSARCH
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sysarch(MIPS_GET_TLS, &res);
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#else
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res = _mips_get_tls();
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#endif
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return (res);
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}
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