1 /* 2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35 /* Allocate space for global thread variables here: */ 36 #define GLOBAL_PTHREAD_PRIVATE 37 38 #include "namespace.h" 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <machine/reg.h> 42 43 #include <sys/ioctl.h> 44 #include <sys/mount.h> 45 #include <sys/uio.h> 46 #include <sys/socket.h> 47 #include <sys/event.h> 48 #include <sys/stat.h> 49 #include <sys/sysctl.h> 50 #include <sys/time.h> 51 #include <sys/ttycom.h> 52 #include <sys/user.h> 53 #include <sys/wait.h> 54 #include <sys/mman.h> 55 #include <dirent.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <paths.h> 59 #include <pthread.h> 60 #include <signal.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 #include "un-namespace.h" 66 67 #include "thr_private.h" 68 69 /* 70 * All weak references used within libc should be in this table. 71 * This will is so that static libraries will work. 72 * 73 * XXXTHR - Check this list. 74 */ 75 static void *references[] = { 76 &_accept, 77 &_bind, 78 &_close, 79 &_connect, 80 &_dup, 81 &_dup2, 82 &_execve, 83 &_fcntl, 84 &_flock, 85 &_flockfile, 86 &_fstat, 87 &_fstatfs, 88 &_fsync, 89 &_funlockfile, 90 &_getdirentries, 91 &_getlogin, 92 &_getpeername, 93 &_getsockname, 94 &_getsockopt, 95 &_ioctl, 96 &_kevent, 97 &_listen, 98 &_nanosleep, 99 &_open, 100 &_pthread_getspecific, 101 &_pthread_key_create, 102 &_pthread_key_delete, 103 &_pthread_mutex_destroy, 104 &_pthread_mutex_init, 105 &_pthread_mutex_lock, 106 &_pthread_mutex_trylock, 107 &_pthread_mutex_unlock, 108 &_pthread_mutexattr_init, 109 &_pthread_mutexattr_destroy, 110 &_pthread_mutexattr_settype, 111 &_pthread_once, 112 &_pthread_setspecific, 113 &_read, 114 &_readv, 115 &_recvfrom, 116 &_recvmsg, 117 &_select, 118 &_sendmsg, 119 &_sendto, 120 &_setsockopt, 121 &_sigaction, 122 &_sigprocmask, 123 &_sigsuspend, 124 &_socket, 125 &_socketpair, 126 &_wait4, 127 &_write, 128 &_writev 129 }; 130 131 /* 132 * These are needed when linking statically. All references within 133 * libgcc (and in the future libc) to these routines are weak, but 134 * if they are not (strongly) referenced by the application or other 135 * libraries, then the actual functions will not be loaded. 136 */ 137 static void *libgcc_references[] = { 138 &_pthread_once, 139 &_pthread_key_create, 140 &_pthread_key_delete, 141 &_pthread_getspecific, 142 &_pthread_setspecific, 143 &_pthread_mutex_init, 144 &_pthread_mutex_destroy, 145 &_pthread_mutex_lock, 146 &_pthread_mutex_trylock, 147 &_pthread_mutex_unlock 148 }; 149 150 int _pthread_guard_default; 151 int _pthread_page_size; 152 153 /* 154 * Threaded process initialization 155 */ 156 void 157 _thread_init(void) 158 { 159 struct pthread *pthread; 160 int fd; 161 int i; 162 size_t len; 163 int mib[2]; 164 sigset_t set; 165 int error; 166 167 struct clockinfo clockinfo; 168 struct sigaction act; 169 170 /* Check if this function has already been called: */ 171 if (_thread_initial) 172 /* Only initialise the threaded application once. */ 173 return; 174 175 _pthread_page_size = getpagesize(); 176 _pthread_guard_default = getpagesize(); 177 178 pthread_attr_default.guardsize_attr = _pthread_guard_default; 179 180 181 /* 182 * Make gcc quiescent about {,libgcc_}references not being 183 * referenced: 184 */ 185 if ((references[0] == NULL) || (libgcc_references[0] == NULL)) 186 PANIC("Failed loading mandatory references in _thread_init"); 187 188 /* 189 * Check for the special case of this process running as 190 * or in place of init as pid = 1: 191 */ 192 if (getpid() == 1) { 193 /* 194 * Setup a new session for this process which is 195 * assumed to be running as root. 196 */ 197 if (setsid() == -1) 198 PANIC("Can't set session ID"); 199 if (revoke(_PATH_CONSOLE) != 0) 200 PANIC("Can't revoke console"); 201 if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0) 202 PANIC("Can't open console"); 203 if (setlogin("root") == -1) 204 PANIC("Can't set login to root"); 205 if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1) 206 PANIC("Can't set controlling terminal"); 207 if (__sys_dup2(fd, 0) == -1 || 208 __sys_dup2(fd, 1) == -1 || 209 __sys_dup2(fd, 2) == -1) 210 PANIC("Can't dup2"); 211 } 212 213 /* Allocate memory for the thread structure of the initial thread: */ 214 if ((pthread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { 215 /* 216 * Insufficient memory to initialise this application, so 217 * abort: 218 */ 219 PANIC("Cannot allocate memory for initial thread"); 220 } 221 /* Zero the initial thread structure: */ 222 memset(pthread, 0, sizeof(struct pthread)); 223 224 _thread_initial = pthread; 225 pthread->arch_id = _set_curthread(NULL, pthread, &error); 226 227 /* Get our thread id. */ 228 thr_self(&pthread->thr_id); 229 230 /* Give this thread default attributes: */ 231 memcpy((void *) &pthread->attr, &pthread_attr_default, 232 sizeof(struct pthread_attr)); 233 234 /* Find the stack top */ 235 mib[0] = CTL_KERN; 236 mib[1] = KERN_USRSTACK; 237 len = sizeof (_usrstack); 238 if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) 239 _usrstack = (void *)USRSTACK; 240 /* 241 * Create a red zone below the main stack. All other stacks are 242 * constrained to a maximum size by the paramters passed to 243 * mmap(), but this stack is only limited by resource limits, so 244 * this stack needs an explicitly mapped red zone to protect the 245 * thread stack that is just beyond. 246 */ 247 if (mmap(_usrstack - PTHREAD_STACK_INITIAL - 248 _pthread_guard_default, _pthread_guard_default, 0, 249 MAP_ANON, -1, 0) == MAP_FAILED) 250 PANIC("Cannot allocate red zone for initial thread"); 251 252 /* Set the main thread stack pointer. */ 253 pthread->stack = _usrstack - PTHREAD_STACK_INITIAL; 254 255 /* Set the stack attributes. */ 256 pthread->attr.stackaddr_attr = pthread->stack; 257 pthread->attr.stacksize_attr = PTHREAD_STACK_INITIAL; 258 259 /* 260 * Write a magic value to the thread structure 261 * to help identify valid ones: 262 */ 263 pthread->magic = PTHREAD_MAGIC; 264 265 /* Set the initial cancel state */ 266 pthread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; 267 268 /* Setup the context for initial thread. */ 269 getcontext(&pthread->ctx); 270 pthread->ctx.uc_stack.ss_sp = pthread->stack; 271 pthread->ctx.uc_stack.ss_size = PTHREAD_STACK_INITIAL; 272 273 /* Default the priority of the initial thread: */ 274 pthread->base_priority = PTHREAD_DEFAULT_PRIORITY; 275 pthread->active_priority = PTHREAD_DEFAULT_PRIORITY; 276 pthread->inherited_priority = 0; 277 278 /* Initialise the state of the initial thread: */ 279 pthread->state = PS_RUNNING; 280 281 /* Set the name of the thread: */ 282 pthread->name = strdup("_thread_initial"); 283 284 /* Initialize joiner to NULL (no joiner): */ 285 pthread->joiner = NULL; 286 287 /* Initialize the owned mutex queue and count: */ 288 TAILQ_INIT(&(pthread->mutexq)); 289 pthread->priority_mutex_count = 0; 290 291 /* Initialise the rest of the fields: */ 292 pthread->specific = NULL; 293 pthread->cleanup = NULL; 294 pthread->flags = 0; 295 pthread->error = 0; 296 TAILQ_INIT(&_thread_list); 297 TAILQ_INSERT_HEAD(&_thread_list, pthread, tle); 298 299 /* Enter a loop to get the existing signal status: */ 300 for (i = 1; i < NSIG; i++) { 301 /* Check for signals which cannot be trapped. */ 302 if (i == SIGKILL || i == SIGSTOP) 303 continue; 304 305 /* Get the signal handler details. */ 306 if (__sys_sigaction(i, NULL, 307 &_thread_sigact[i - 1]) != 0) 308 PANIC("Cannot read signal handler info"); 309 } 310 act.sa_sigaction = _thread_sig_wrapper; 311 act.sa_flags = SA_SIGINFO; 312 SIGFILLSET(act.sa_mask); 313 314 if (__sys_sigaction(SIGTHR, &act, NULL)) 315 PANIC("Cannot set SIGTHR handler.\n"); 316 317 SIGEMPTYSET(set); 318 SIGADDSET(set, SIGTHR); 319 __sys_sigprocmask(SIG_BLOCK, &set, 0); 320 321 /* Get the kernel clockrate: */ 322 mib[0] = CTL_KERN; 323 mib[1] = KERN_CLOCKRATE; 324 len = sizeof (struct clockinfo); 325 if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0) 326 _clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ? 327 clockinfo.tick : CLOCK_RES_USEC_MIN; 328 329 /* Initialise the garbage collector mutex and condition variable. */ 330 if (_pthread_mutex_init(&dead_list_lock,NULL) != 0 || 331 _pthread_cond_init(&_gc_cond,NULL) != 0) 332 PANIC("Failed to initialise garbage collector mutex or condvar"); 333 } 334 335 /* 336 * Special start up code for NetBSD/Alpha 337 */ 338 #if defined(__NetBSD__) && defined(__alpha__) 339 int 340 main(int argc, char *argv[], char *env); 341 342 int 343 _thread_main(int argc, char *argv[], char *env) 344 { 345 _thread_init(); 346 return (main(argc, argv, env)); 347 } 348 #endif 349