1 /*- 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Machine-dependent thread prototypes/definitions. 31 */ 32 #ifndef _PTHREAD_MD_H_ 33 #define _PTHREAD_MD_H_ 34 35 #include <sys/types.h> 36 #include <machine/sysarch.h> 37 #include <stddef.h> 38 39 #define CPU_SPINWAIT 40 #define DTV_OFFSET offsetof(struct tcb, tcb_dtv) 41 42 /* 43 * Variant II tcb, first two members are required by rtld. 44 */ 45 struct tcb { 46 void *tcb_dtv; /* required by rtld */ 47 struct pthread *tcb_thread; /* our hook */ 48 }; 49 50 /* 51 * The tcb constructors. 52 */ 53 struct tcb *_tcb_ctor(struct pthread *, int); 54 void _tcb_dtor(struct tcb *); 55 56 /* Called from the thread to set its private data. */ 57 static __inline void 58 _tcb_set(struct tcb *tcb) 59 { 60 #ifdef ARM_TP_ADDRESS 61 *((struct tcb **)ARM_TP_ADDRESS) = tcb; /* avoids a system call */ 62 #else 63 sysarch(ARM_SET_TP, tcb); 64 #endif 65 } 66 67 /* 68 * Get the current tcb. 69 */ 70 static __inline struct tcb * 71 _tcb_get(void) 72 { 73 #ifdef ARM_TP_ADDRESS 74 return (*((struct tcb **)ARM_TP_ADDRESS)); 75 #else 76 struct tcb *tcb; 77 78 __asm __volatile("mrc p15, 0, %0, c13, c0, 3" \ 79 : "=r" (tcb)); 80 return (tcb); 81 #endif 82 } 83 84 extern struct pthread *_thr_initial; 85 86 static __inline struct pthread * 87 _get_curthread(void) 88 { 89 if (_thr_initial) 90 return (_tcb_get()->tcb_thread); 91 return (NULL); 92 } 93 94 #endif /* _PTHREAD_MD_H_ */ 95