diff options
Diffstat (limited to 'lib/libthr/arch/amd64')
| -rw-r--r-- | lib/libthr/arch/amd64/Makefile.inc | 7 | ||||
| -rw-r--r-- | lib/libthr/arch/amd64/amd64/thr_machdep.c | 48 | ||||
| -rw-r--r-- | lib/libthr/arch/amd64/include/pthread_md.h | 62 |
3 files changed, 117 insertions, 0 deletions
diff --git a/lib/libthr/arch/amd64/Makefile.inc b/lib/libthr/arch/amd64/Makefile.inc new file mode 100644 index 000000000000..fe80e1a73cc9 --- /dev/null +++ b/lib/libthr/arch/amd64/Makefile.inc @@ -0,0 +1,7 @@ +# With the current compiler and libthr code, using SSE in libthr +# does not provide enough performance improvement to outweigh +# the extra context switch cost. This can measurably impact +# performance when the application also does not use enough SSE. +CFLAGS+=${CFLAGS_NO_SIMD} + +SRCS+= thr_machdep.c diff --git a/lib/libthr/arch/amd64/amd64/thr_machdep.c b/lib/libthr/arch/amd64/amd64/thr_machdep.c new file mode 100644 index 000000000000..d23e1689779c --- /dev/null +++ b/lib/libthr/arch/amd64/amd64/thr_machdep.c @@ -0,0 +1,48 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2025 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Konstantin Belousov + * under sponsorship from the FreeBSD Foundation. + * + */ + +#define _WANT_P_OSREL +#include <sys/param.h> +#include <errno.h> +#include <machine/sysarch.h> + +#include "libc_private.h" +#include "thr_private.h" + +void +__thr_setup_tsd(struct pthread *thread) +{ + void *base; + int error; + + if (__getosreldate() < P_OSREL_TLSBASE) { + amd64_set_tlsbase(thread->tcb); + return; + } + + /* + * Make tlsbase handling more compatible with code, like Go + * runtime, which wants to manage fsbase itself, and which do + * not need assistance in setting fsbase for signal handlers. + * + * If the main thread did not used amd64_set_tlsbase(), which + * means that rtld/libc was not utilized, do not use + * amd64_set_tlsbase() either. Also do not mark new threads + * as using C runtime with the THR_C_RUNTIME flag. + */ + error = sysarch(AMD64_GET_TLSBASE, &base); + if (error != 0 && errno == ESRCH) { + __thr_new_flags &= ~THR_C_RUNTIME; + amd64_set_fsbase(thread->tcb); + } else { + amd64_set_tlsbase(thread->tcb); + } +} diff --git a/lib/libthr/arch/amd64/include/pthread_md.h b/lib/libthr/arch/amd64/include/pthread_md.h new file mode 100644 index 000000000000..02b73d90f006 --- /dev/null +++ b/lib/libthr/arch/amd64/include/pthread_md.h @@ -0,0 +1,62 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (C) 2003 David Xu <davidxu@freebsd.org> + * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Neither the name of the author nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Machine-dependent thread prototypes/definitions. + */ +#ifndef _PTHREAD_MD_H_ +#define _PTHREAD_MD_H_ + +#include <stddef.h> +#include <sys/types.h> +#include <machine/tls.h> + +#define CPU_SPINWAIT __asm __volatile("pause") + +/* For use in _Static_assert to check structs will fit in a page */ +#define THR_PAGE_SIZE_MIN PAGE_SIZE + +static __inline struct pthread * +_get_curthread(void) +{ + struct pthread *thr; + + __asm __volatile("movq %%fs:%c1, %0" : "=r" (thr) + : "i" (offsetof(struct tcb, tcb_thread))); + return (thr); +} + +static __inline void +_thr_resolve_machdep(void) +{ +} + +void __thr_setup_tsd(struct pthread *thread); + +#endif |