1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 /* 32 * Machine-dependent thread prototypes/definitions. 33 */ 34 #ifndef _PTHREAD_MD_H_ 35 #define _PTHREAD_MD_H_ 36 37 #include <sys/types.h> 38 #include <machine/sysarch.h> 39 #include <stddef.h> 40 41 #define CPU_SPINWAIT 42 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv) 43 44 /* 45 * Variant I tcb. The structure layout is fixed, don't blindly 46 * change it. 47 */ 48 struct tcb { 49 void *tcb_dtv; /* required by rtld */ 50 struct pthread *tcb_thread; /* our hook */ 51 }; 52 53 /* Called from the thread to set its private data. */ 54 static __inline void 55 _tcb_set(struct tcb *tcb) 56 { 57 #ifdef ARM_TP_ADDRESS 58 *((struct tcb **)ARM_TP_ADDRESS) = tcb; /* avoids a system call */ 59 #else 60 sysarch(ARM_SET_TP, tcb); 61 #endif 62 } 63 64 /* 65 * Get the current tcb. 66 */ 67 static __inline struct tcb * 68 _tcb_get(void) 69 { 70 #ifdef ARM_TP_ADDRESS 71 return (*((struct tcb **)ARM_TP_ADDRESS)); 72 #else 73 struct tcb *tcb; 74 75 __asm __volatile("mrc p15, 0, %0, c13, c0, 3" \ 76 : "=r" (tcb)); 77 return (tcb); 78 #endif 79 } 80 81 static __inline struct pthread * 82 _get_curthread(void) 83 { 84 if (_thr_initial) 85 return (_tcb_get()->tcb_thread); 86 return (NULL); 87 } 88 89 #endif /* _PTHREAD_MD_H_ */ 90