1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2003 David Xu <davidxu@freebsd.org> 5 * Copyright (c) 2001 Daniel Eischen <deischen@freebsd.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Neither the name of the author nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * Machine-dependent thread prototypes/definitions. 34 */ 35 #ifndef _PTHREAD_MD_H_ 36 #define _PTHREAD_MD_H_ 37 38 #include <stddef.h> 39 #include <sys/types.h> 40 #include <machine/sysarch.h> 41 42 #define CPU_SPINWAIT __asm __volatile("pause") 43 44 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv) 45 46 /* 47 * Variant II tcb, first two members are required by rtld, 48 * %fs points to the structure. 49 */ 50 struct tcb { 51 struct tcb *tcb_self; /* required by rtld */ 52 void *tcb_dtv; /* required by rtld */ 53 struct pthread *tcb_thread; 54 void *tcb_spare[1]; 55 }; 56 57 /* 58 * Evaluates to the byte offset of the per-tcb variable name. 59 */ 60 #define __tcb_offset(name) __offsetof(struct tcb, name) 61 62 /* 63 * Evaluates to the type of the per-tcb variable name. 64 */ 65 #define __tcb_type(name) __typeof(((struct tcb *)0)->name) 66 67 /* 68 * Evaluates to the value of the per-tcb variable name. 69 */ 70 #define TCB_GET64(name) ({ \ 71 __tcb_type(name) __result; \ 72 \ 73 u_long __i; \ 74 __asm __volatile("movq %%fs:%1, %0" \ 75 : "=r" (__i) \ 76 : "m" (*(volatile u_long *)(__tcb_offset(name)))); \ 77 __result = (__tcb_type(name))__i; \ 78 \ 79 __result; \ 80 }) 81 82 static __inline void 83 _tcb_set(struct tcb *tcb) 84 { 85 amd64_set_fsbase(tcb); 86 } 87 88 static __inline struct tcb * 89 _tcb_get(void) 90 { 91 return (TCB_GET64(tcb_self)); 92 } 93 94 static __inline struct pthread * 95 _get_curthread(void) 96 { 97 return (TCB_GET64(tcb_thread)); 98 } 99 100 #define HAS__UMTX_OP_ERR 1 101 102 #endif 103