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 I tcb. The structure layout is fixed, don't blindly 44 * change it. 45 */ 46 struct tcb { 47 void *tcb_dtv; /* required by rtld */ 48 struct pthread *tcb_thread; /* our hook */ 49 }; 50 51 /* Called from the thread to set its private data. */ 52 static __inline void 53 _tcb_set(struct tcb *tcb) 54 { 55 #ifdef ARM_TP_ADDRESS 56 *((struct tcb **)ARM_TP_ADDRESS) = tcb; /* avoids a system call */ 57 #else 58 sysarch(ARM_SET_TP, tcb); 59 #endif 60 } 61 62 /* 63 * Get the current tcb. 64 */ 65 static __inline struct tcb * 66 _tcb_get(void) 67 { 68 #ifdef ARM_TP_ADDRESS 69 return (*((struct tcb **)ARM_TP_ADDRESS)); 70 #else 71 struct tcb *tcb; 72 73 __asm __volatile("mrc p15, 0, %0, c13, c0, 3" \ 74 : "=r" (tcb)); 75 return (tcb); 76 #endif 77 } 78 79 static __inline struct pthread * 80 _get_curthread(void) 81 { 82 if (_thr_initial) 83 return (_tcb_get()->tcb_thread); 84 return (NULL); 85 } 86 87 #endif /* _PTHREAD_MD_H_ */ 88