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cb916ce754
Later gcc and clang have deprecated =v (which maps to a specific temp register) and instead we should just use =r to have the assembler (hopefully!) save/restore things appropriately after choosing a register. Tested: * AR9344 SoC, with userreg support * AR9331 SoC, with no userreg support Sponsored by: Sponsored by: DARPA, AFRL (MIPS TLS user register work)
133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*-
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* Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
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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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*
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: src/lib/libthr/arch/arm/include/pthread_md.h,v 1.3 2005/10/29 13:40:31 davidxu
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* $FreeBSD$
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*/
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/*
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* Machine-dependent thread prototypes/definitions.
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*/
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#ifndef _PTHREAD_MD_H_
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#define _PTHREAD_MD_H_
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#include <sys/types.h>
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#include <machine/sysarch.h>
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#include <machine/tls.h>
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#include <stddef.h>
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#define CPU_SPINWAIT
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#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
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/*
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* Variant I tcb. The structure layout is fixed, don't blindly
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* change it!
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*/
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struct tcb {
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void *tcb_dtv;
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struct pthread *tcb_thread;
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};
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/* Called from the thread to set its private data. */
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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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/*
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* Get the current tcb.
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*/
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#ifdef TLS_USE_SYSARCH
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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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sysarch(MIPS_GET_TLS, &tcb);
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return tcb;
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}
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#else /* ! TLS_USE_SYSARCH */
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# if defined(__mips_n64)
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static __inline struct tcb *
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_tcb_get(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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return (struct tcb *)(_rv - TLS_TP_OFFSET - TLS_TCB_SIZE);
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}
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# else /* mips 32 */
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static __inline struct tcb *
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_tcb_get(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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return (struct tcb *)(_rv - TLS_TP_OFFSET - TLS_TCB_SIZE);
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}
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# endif /* ! __mips_n64 */
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#endif /* ! TLS_USE_SYSARCH */
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extern struct pthread *_thr_initial;
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static __inline struct pthread *
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_get_curthread(void)
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{
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if (_thr_initial)
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return (_tcb_get()->tcb_thread);
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return (NULL);
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}
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#endif /* _PTHREAD_MD_H_ */
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