pthread_md.h revision 133857
1/*- 2 * Copyright (c) 2003 Jake Burkholder <jake@freebsd.org>. 3 * Copyright (c) 2003 Marcel Moolenaar 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD: head/lib/libkse/arch/sparc64/include/pthread_md.h 133857 2004-08-16 14:07:38Z davidxu $ 28 */ 29 30/* 31 * Machine-dependent thread prototypes/definitions for the thread kernel. 32 */ 33#ifndef _PTHREAD_MD_H_ 34#define _PTHREAD_MD_H_ 35 36#include <sys/kse.h> 37#include <stddef.h> 38#include <ucontext.h> 39 40#define KSE_STACKSIZE 16384 41#define DTV_OFFSET offsetof(struct tcb, tcb_tp.tp_tdv) 42 43int _thr_setcontext(mcontext_t *, intptr_t, intptr_t *); 44int _thr_getcontext(mcontext_t *); 45 46#define THR_GETCONTEXT(ucp) _thr_getcontext(&(ucp)->uc_mcontext) 47#define THR_SETCONTEXT(ucp) _thr_setcontext(&(ucp)->uc_mcontext, 0, NULL) 48 49#define PER_THREAD 50 51struct kcb; 52struct kse; 53struct pthread; 54struct tcb; 55struct tdv; /* We don't know what this is yet? */ 56 57 58/* 59 * %g6 points to one of these. We define the static TLS as an array 60 * of long double to enforce 16-byte alignment of the TLS memory. 61 * 62 * XXX - Both static and dynamic allocation of any of these structures 63 * will result in a valid, well-aligned thread pointer??? 64 */ 65struct sparc64_tp { 66 struct tdv *tp_tdv; /* dynamic TLS */ 67 uint64_t _reserved_; 68 long double tp_tls[0]; /* static TLS */ 69}; 70 71struct tcb { 72 struct pthread *tcb_thread; 73 void *tcb_addr; /* allocated tcb address */ 74 struct kcb *tcb_curkcb; 75 uint64_t tcb_isfake; 76 uint64_t tcb_spare[4]; 77 struct kse_thr_mailbox tcb_tmbx; /* needs 64-byte alignment */ 78 struct sparc64_tp tcb_tp; 79} __aligned(64); 80 81struct kcb { 82 struct kse_mailbox kcb_kmbx; 83 struct tcb kcb_faketcb; 84 struct tcb *kcb_curtcb; 85 struct kse *kcb_kse; 86}; 87 88register struct sparc64_tp *_tp __asm("%g6"); 89 90#define _tcb ((struct tcb*)((char*)(_tp) - offsetof(struct tcb, tcb_tp))) 91 92/* 93 * The kcb and tcb constructors. 94 */ 95struct tcb *_tcb_ctor(struct pthread *, int); 96void _tcb_dtor(struct tcb *); 97struct kcb *_kcb_ctor(struct kse *kse); 98void _kcb_dtor(struct kcb *); 99 100/* Called from the KSE to set its private data. */ 101static __inline void 102_kcb_set(struct kcb *kcb) 103{ 104 /* There is no thread yet; use the fake tcb. */ 105 _tp = &kcb->kcb_faketcb.tcb_tp; 106} 107 108/* 109 * Get the current kcb. 110 * 111 * This can only be called while in a critical region; don't 112 * worry about having the kcb changed out from under us. 113 */ 114static __inline struct kcb * 115_kcb_get(void) 116{ 117 return (_tcb->tcb_curkcb); 118} 119 120/* 121 * Enter a critical region. 122 * 123 * Read and clear km_curthread in the kse mailbox. 124 */ 125static __inline struct kse_thr_mailbox * 126_kcb_critical_enter(void) 127{ 128 struct kse_thr_mailbox *crit; 129 uint32_t flags; 130 131 if (_tcb->tcb_isfake != 0) { 132 /* 133 * We already are in a critical region since 134 * there is no current thread. 135 */ 136 crit = NULL; 137 } else { 138 flags = _tcb->tcb_tmbx.tm_flags; 139 _tcb->tcb_tmbx.tm_flags |= TMF_NOUPCALL; 140 crit = _tcb->tcb_curkcb->kcb_kmbx.km_curthread; 141 _tcb->tcb_curkcb->kcb_kmbx.km_curthread = NULL; 142 _tcb->tcb_tmbx.tm_flags = flags; 143 } 144 return (crit); 145} 146 147static __inline void 148_kcb_critical_leave(struct kse_thr_mailbox *crit) 149{ 150 /* No need to do anything if this is a fake tcb. */ 151 if (_tcb->tcb_isfake == 0) 152 _tcb->tcb_curkcb->kcb_kmbx.km_curthread = crit; 153} 154 155static __inline int 156_kcb_in_critical(void) 157{ 158 uint32_t flags; 159 int ret; 160 161 if (_tcb->tcb_isfake != 0) { 162 /* 163 * We are in a critical region since there is no 164 * current thread. 165 */ 166 ret = 1; 167 } else { 168 flags = _tcb->tcb_tmbx.tm_flags; 169 _tcb->tcb_tmbx.tm_flags |= TMF_NOUPCALL; 170 ret = (_tcb->tcb_curkcb->kcb_kmbx.km_curthread == NULL); 171 _tcb->tcb_tmbx.tm_flags = flags; 172 } 173 return (ret); 174} 175 176static __inline void 177_tcb_set(struct kcb *kcb, struct tcb *tcb) 178{ 179 if (tcb == NULL) 180 tcb = &kcb->kcb_faketcb; 181 kcb->kcb_curtcb = tcb; 182 tcb->tcb_curkcb = kcb; 183 _tp = &tcb->tcb_tp; 184} 185 186static __inline struct tcb * 187_tcb_get(void) 188{ 189 return (_tcb); 190} 191 192static __inline struct pthread * 193_get_curthread(void) 194{ 195 return (_tcb->tcb_thread); 196} 197 198/* 199 * Get the current kse. 200 * 201 * Like _kcb_get(), this can only be called while in a critical region. 202 */ 203static __inline struct kse * 204_get_curkse(void) 205{ 206 return (_tcb->tcb_curkcb->kcb_kse); 207} 208 209void _sparc64_enter_uts(kse_func_t uts, struct kse_mailbox *km, void *stack, 210 size_t stacksz); 211 212static __inline int 213_thread_enter_uts(struct tcb *tcb, struct kcb *kcb) 214{ 215 if (_thr_getcontext(&tcb->tcb_tmbx.tm_context.uc_mcontext) == 0) { 216 /* Make the fake tcb the current thread. */ 217 kcb->kcb_curtcb = &kcb->kcb_faketcb; 218 _tp = &kcb->kcb_faketcb.tcb_tp; 219 _sparc64_enter_uts(kcb->kcb_kmbx.km_func, &kcb->kcb_kmbx, 220 kcb->kcb_kmbx.km_stack.ss_sp, 221 kcb->kcb_kmbx.km_stack.ss_size); 222 /* We should not reach here. */ 223 return (-1); 224 } 225 return (0); 226} 227 228static __inline int 229_thread_switch(struct kcb *kcb, struct tcb *tcb, int setmbox) 230{ 231 extern int _libkse_debug; 232 mcontext_t *mc; 233 234 _tcb_set(kcb, tcb); 235 mc = &tcb->tcb_tmbx.tm_context.uc_mcontext; 236 if (_libkse_debug == 0) { 237 tcb->tcb_tmbx.tm_lwp = kcb->kcb_kmbx.km_lwp; 238 if (setmbox) 239 _thr_setcontext(mc, (intptr_t)&tcb->tcb_tmbx, 240 (intptr_t *)&kcb->kcb_kmbx.km_curthread); 241 else 242 _thr_setcontext(mc, 0, NULL); 243 } else { 244 if (setmbox) 245 kse_switchin(&tcb->tcb_tmbx, KSE_SWITCHIN_SETTMBX); 246 else 247 kse_switchin(&tcb->tcb_tmbx, 0); 248 } 249 250 /* We should not reach here. */ 251 return (-1); 252} 253 254#endif /* _PTHREAD_MD_H_ */ 255