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 30 #ifndef _MACHINE_TLS_H_ 31 #define _MACHINE_TLS_H_ 32 33 #include <x86/sysarch.h> 34 35 #define TLS_VARIANT_II 36 37 struct pthread; 38 39 /* 40 * Variant II tcb, first two members are required by rtld, 41 * %fs (amd64) / %gs (i386) points to the structure. 42 */ 43 struct tcb { 44 struct tcb *tcb_self; /* required by rtld */ 45 uintptr_t *tcb_dtv; /* required by rtld */ 46 struct pthread *tcb_thread; 47 }; 48 49 #define TLS_DTV_OFFSET 0 50 #ifdef __amd64__ 51 #define TLS_TCB_ALIGN 16 52 #else 53 #define TLS_TCB_ALIGN 4 54 #endif 55 #define TLS_TCB_SIZE sizeof(struct tcb) 56 #define TLS_TP_OFFSET 0 57 58 static __inline void 59 _tcb_set(struct tcb *tcb) 60 { 61 #ifdef __amd64__ 62 amd64_set_fsbase(tcb); 63 #else 64 i386_set_gsbase(tcb); 65 #endif 66 } 67 68 static __inline struct tcb * 69 _tcb_get(void) 70 { 71 struct tcb *tcb; 72 73 #ifdef __amd64__ 74 __asm __volatile("movq %%fs:0, %0" : "=r" (tcb)); 75 #else 76 __asm __volatile("movl %%gs:0, %0" : "=r" (tcb)); 77 #endif 78 return (tcb); 79 } 80 81 #endif /* !_MACHINE_TLS_H_ */ 82