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25f14b19c6
The header exports the following:
- Definition of struct tcb.
- Helpers to get/set the tcb for the current thread.
- TLS_TCB_SIZE (size of TCB)
- TLS_TCB_ALIGN (alignment of TCB)
- TLS_VARIANT_I or TLS_VARIANT_II
- TLS_DTV_OFFSET (bias of pointers in dtv[])
- TLS_TP_OFFSET (bias of "thread pointer" relative to TCB)
Note that TLS_TP_OFFSET does not account for if the unbiased thread
pointer points to the start of the TCB (arm and x86) or the end of the
TCB (MIPS, PowerPC, and RISC-V).
Note also that for amd64, the struct tcb does not include the unused
tcb_spare field included in the current structure in libthr. libthr
does not use this field, and the existing calls in libc and rtld that
allocate a TCB for amd64 assume it is the size of 3 Elf_Addr's (and
thus do not allocate room for tcb_spare).
A <sys/_tls_variant_i.h> header is used by architectures using
Variant I TLS which uses a common struct tcb.
Reviewed by: kib (older version of x86/tls.h), jrtc27
Sponsored by: The University of Cambridge, Google Inc.
Differential Revision: https://reviews.freebsd.org/D33351
For stable/13 only, sys/arm/include/tls.h includes support for
ARM_TP_ADDRESS which is not present in main.
(cherry picked from commit 1a62e9bc00)
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2012 Oleksandr Tymoshenko
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* All rights reserved.
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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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* without modification, immediately at the beginning of the file.
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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
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* the documentation and/or other materials provided with the
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* 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 FOR
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* 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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* $FreeBSD$
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*
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*/
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#ifndef __MIPS_TLS_H__
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#define __MIPS_TLS_H__
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#include <sys/_tls_variant_i.h>
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#include <machine/sysarch.h>
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/*
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* TLS parameters
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*/
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#define TLS_DTV_OFFSET 0x8000
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#define TLS_TCB_ALIGN 8
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#define TLS_TP_OFFSET 0x7000
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#ifdef COMPAT_FREEBSD32
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#define TLS_TCB_SIZE32 8
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#endif
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#ifndef _KERNEL
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static __inline void
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_tcb_set(struct tcb *tcb)
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{
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sysarch(MIPS_SET_TLS, tcb);
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}
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static __inline struct tcb *
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_tcb_get(void)
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{
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struct tcb *tcb;
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#ifdef TLS_USE_SYSARCH
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sysarch(MIPS_GET_TLS, &tcb);
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#else
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__asm__ __volatile__ (
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".set\tpush\n\t"
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#ifdef __mips_n64
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".set\tmips64r2\n\t"
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#else
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".set\tmips32r2\n\t"
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#endif
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"rdhwr\t%0, $29\n\t"
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".set\tpop"
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: "=r" (tcb));
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tcb = (struct tcb *)((uintptr_t)tcb - TLS_TP_OFFSET - TLS_TCB_SIZE);
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#endif
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return (tcb);
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}
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#endif
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#endif /* __MIPS_TLS_H__ */
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