init_main.c revision 1.323
1 /* $NetBSD: init_main.c,v 1.323 2007/10/19 12:16:41 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 37 */ 38 39 /* 40 * Copyright (c) 1995 Christopher G. Demetriou. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)init_main.c 8.16 (Berkeley) 5/14/95 71 */ 72 73 #include <sys/cdefs.h> 74 __KERNEL_RCSID(0, "$NetBSD: init_main.c,v 1.323 2007/10/19 12:16:41 ad Exp $"); 75 76 #include "opt_ipsec.h" 77 #include "opt_multiprocessor.h" 78 #include "opt_ntp.h" 79 #include "opt_pipe.h" 80 #include "opt_posix.h" 81 #include "opt_syscall_debug.h" 82 #include "opt_sysv.h" 83 #include "opt_systrace.h" 84 #include "opt_fileassoc.h" 85 #include "opt_ktrace.h" 86 #include "opt_pax.h" 87 88 #include "rnd.h" 89 #include "sysmon_envsys.h" 90 #include "sysmon_power.h" 91 #include "sysmon_taskq.h" 92 #include "sysmon_wdog.h" 93 #include "veriexec.h" 94 95 #include <sys/param.h> 96 #include <sys/acct.h> 97 #include <sys/filedesc.h> 98 #include <sys/file.h> 99 #include <sys/errno.h> 100 #include <sys/callout.h> 101 #include <sys/cpu.h> 102 #include <sys/kernel.h> 103 #include <sys/kmem.h> 104 #include <sys/mount.h> 105 #include <sys/proc.h> 106 #include <sys/kthread.h> 107 #include <sys/resourcevar.h> 108 #include <sys/signalvar.h> 109 #include <sys/systm.h> 110 #include <sys/vnode.h> 111 #include <sys/fstrans.h> 112 #include <sys/tty.h> 113 #include <sys/conf.h> 114 #include <sys/disklabel.h> 115 #include <sys/buf.h> 116 #include <sys/device.h> 117 #include <sys/exec.h> 118 #include <sys/socketvar.h> 119 #include <sys/protosw.h> 120 #include <sys/reboot.h> 121 #include <sys/user.h> 122 #include <sys/sysctl.h> 123 #include <sys/event.h> 124 #include <sys/mbuf.h> 125 #include <sys/sched.h> 126 #include <sys/sleepq.h> 127 #include <sys/iostat.h> 128 #include <sys/vmem.h> 129 #include <sys/uuid.h> 130 #include <sys/extent.h> 131 #include <sys/disk.h> 132 #include <sys/mqueue.h> 133 #ifdef FAST_IPSEC 134 #include <netipsec/ipsec.h> 135 #endif 136 #ifdef SYSVSHM 137 #include <sys/shm.h> 138 #endif 139 #ifdef SYSVSEM 140 #include <sys/sem.h> 141 #endif 142 #ifdef SYSVMSG 143 #include <sys/msg.h> 144 #endif 145 #ifdef SYSTRACE 146 #include <sys/systrace.h> 147 #endif 148 #ifdef P1003_1B_SEMAPHORE 149 #include <sys/ksem.h> 150 #endif 151 #include <sys/domain.h> 152 #include <sys/namei.h> 153 #if NRND > 0 154 #include <sys/rnd.h> 155 #endif 156 #include <sys/pipe.h> 157 #ifdef LKM 158 #include <sys/lkm.h> 159 #endif 160 #if NVERIEXEC > 0 161 #include <sys/verified_exec.h> 162 #endif /* NVERIEXEC > 0 */ 163 #ifdef KTRACE 164 #include <sys/ktrace.h> 165 #endif 166 #include <sys/debug.h> 167 #include <sys/kauth.h> 168 #include <net80211/ieee80211_netbsd.h> 169 170 #include <sys/syscall.h> 171 #include <sys/syscallargs.h> 172 173 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 174 #include <sys/pax.h> 175 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 176 #include <ufs/ufs/quota.h> 177 178 #include <miscfs/genfs/genfs.h> 179 #include <miscfs/syncfs/syncfs.h> 180 181 #include <sys/cpu.h> 182 183 #include <uvm/uvm.h> 184 185 #if NSYSMON_TASKQ > 0 186 #include <dev/sysmon/sysmon_taskq.h> 187 #endif 188 189 #include <dev/cons.h> 190 191 #if NSYSMON_ENVSYS > 0 || NSYSMON_POWER > 0 || NSYSMON_WDOG > 0 192 #include <dev/sysmon/sysmonvar.h> 193 #endif 194 195 #include <net/if.h> 196 #include <net/raw_cb.h> 197 198 #include <secmodel/secmodel.h> 199 200 extern struct proc proc0; 201 extern struct lwp lwp0; 202 extern struct cwdinfo cwdi0; 203 extern time_t rootfstime; 204 205 #ifndef curlwp 206 struct lwp *curlwp = &lwp0; 207 #endif 208 struct proc *initproc; 209 210 struct vnode *rootvp, *swapdev_vp; 211 int boothowto; 212 int cold = 1; /* still working on startup */ 213 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 214 215 volatile int start_init_exec; /* semaphore for start_init() */ 216 217 static void check_console(struct lwp *l); 218 static void start_init(void *); 219 void main(void); 220 221 #if defined(__SSP__) || defined(__SSP_ALL__) 222 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 223 void __stack_chk_fail(void); 224 225 void 226 __stack_chk_fail(void) 227 { 228 panic("stack overflow detected; terminated"); 229 } 230 #endif 231 232 void __secmodel_none(void); 233 __weak_alias(secmodel_start,__secmodel_none); 234 void 235 __secmodel_none(void) 236 { 237 return; 238 } 239 240 /* 241 * System startup; initialize the world, create process 0, mount root 242 * filesystem, and fork to create init and pagedaemon. Most of the 243 * hard work is done in the lower-level initialization routines including 244 * startup(), which does memory initialization and autoconfiguration. 245 */ 246 void 247 main(void) 248 { 249 #ifdef __HAVE_TIMECOUNTER 250 struct timeval time; 251 #endif 252 struct lwp *l; 253 struct proc *p; 254 struct pdevinit *pdev; 255 int s, error; 256 extern struct pdevinit pdevinit[]; 257 #ifdef NVNODE_IMPLICIT 258 int usevnodes; 259 #endif 260 CPU_INFO_ITERATOR cii; 261 struct cpu_info *ci; 262 263 l = &lwp0; 264 l->l_cpu = curcpu(); 265 l->l_proc = &proc0; 266 l->l_lid = 1; 267 268 /* 269 * XXX This is a temporary check to be removed before 270 * NetBSD 5.0 is released. 271 */ 272 #if !defined(__i386__ ) && !defined(__x86_64__) 273 if (curlwp != l) { 274 printf("NOTICE: curlwp should be set before main()\n"); 275 DELAY(250000); 276 curlwp = l; 277 } 278 #endif 279 280 /* 281 * Attempt to find console and initialize 282 * in case of early panic or other messages. 283 */ 284 consinit(); 285 286 kernel_lock_init(); 287 288 uvm_init(); 289 290 #ifdef DEBUG 291 debug_init(); 292 #endif 293 294 kmem_init(); 295 296 /* Initialize the extent manager. */ 297 extent_init(); 298 299 /* Do machine-dependent initialization. */ 300 cpu_startup(); 301 302 /* Initialize callouts, part 1. */ 303 callout_startup(); 304 305 /* 306 * Initialize the kernel authorization subsystem and start the 307 * default security model, if any. We need to do this early 308 * enough so that subsystems relying on any of the aforementioned 309 * can work properly. Since the security model may dictate the 310 * credential inheritance policy, it is needed at least before 311 * any process is created, specifically proc0. 312 */ 313 kauth_init(); 314 secmodel_start(); 315 316 /* Initialize the buffer cache */ 317 bufinit(); 318 319 /* 320 * Initialize mbuf's. Do this now because we might attempt to 321 * allocate mbufs or mbuf clusters during autoconfiguration. 322 */ 323 mbinit(); 324 325 /* Initialize sockets. */ 326 soinit(); 327 328 /* 329 * The following things must be done before autoconfiguration. 330 */ 331 evcnt_init(); /* initialize event counters */ 332 #if NRND > 0 333 rnd_init(); /* initialize RNG */ 334 #endif 335 336 /* Initialize process and pgrp structures. */ 337 procinit(); 338 lwpinit(); 339 340 /* Initialize signal-related data structures. */ 341 signal_init(); 342 343 /* Create process 0 (the swapper). */ 344 proc0_init(); 345 346 /* Initialize the UID hash table. */ 347 uid_init(); 348 349 /* Charge root for one process. */ 350 (void)chgproccnt(0, 1); 351 352 /* Initialize the run queues, turnstiles and sleep queues. */ 353 mutex_init(&cpu_lock, MUTEX_DEFAULT, IPL_NONE); 354 sched_rqinit(); 355 turnstile_init(); 356 sleeptab_init(&sleeptab); 357 358 /* MI initialization of the boot cpu */ 359 error = mi_cpu_attach(curcpu()); 360 KASSERT(error == 0); 361 362 /* Initialize the sysctl subsystem. */ 363 sysctl_init(); 364 365 /* Initialize I/O statistics. */ 366 iostat_init(); 367 368 /* Initialize the file systems. */ 369 #ifdef NVNODE_IMPLICIT 370 /* 371 * If maximum number of vnodes in namei vnode cache is not explicitly 372 * defined in kernel config, adjust the number such as we use roughly 373 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 374 */ 375 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 376 if (usevnodes > desiredvnodes) 377 desiredvnodes = usevnodes; 378 #endif 379 vfsinit(); 380 381 /* Initialize fstrans. */ 382 fstrans_init(); 383 384 /* Initialize the file descriptor system. */ 385 filedesc_init(); 386 387 /* Initialize the select()/poll() system calls. */ 388 selsysinit(); 389 390 /* Initialize asynchronous I/O. */ 391 aio_sysinit(); 392 393 /* Initialize message queues. */ 394 mqueue_sysinit(); 395 396 /* Initialize the system monitor subsystems. */ 397 #if NSYSMON_TASKQ > 0 398 sysmon_task_queue_preinit(); 399 #endif 400 401 #if NSYSMON_ENVSYS > 0 402 sysmon_envsys_init(); 403 #endif 404 405 #if NSYSMON_POWER > 0 406 sysmon_power_init(); 407 #endif 408 409 #if NSYSMON_WDOG > 0 410 sysmon_wdog_init(); 411 #endif 412 413 #ifdef __HAVE_TIMECOUNTER 414 inittimecounter(); 415 ntp_init(); 416 #endif /* __HAVE_TIMECOUNTER */ 417 418 /* Initialize the device switch tables. */ 419 devsw_init(); 420 421 /* Initialize the disk wedge subsystem. */ 422 dkwedge_init(); 423 424 /* Configure the system hardware. This will enable interrupts. */ 425 configure(); 426 427 #if defined(__SSP__) || defined(__SSP_ALL__) 428 { 429 #ifdef DIAGNOSTIC 430 printf("Initializing SSP:"); 431 #endif 432 /* 433 * We initialize ssp here carefully: 434 * 1. after we got some entropy 435 * 2. without calling a function 436 */ 437 size_t i; 438 long guard[__arraycount(__stack_chk_guard)]; 439 440 arc4randbytes(guard, sizeof(guard)); 441 for (i = 0; i < __arraycount(guard); i++) 442 __stack_chk_guard[i] = guard[i]; 443 #ifdef DIAGNOSTIC 444 for (i = 0; i < __arraycount(guard); i++) 445 printf("%lx ", guard[i]); 446 printf("\n"); 447 #endif 448 } 449 #endif 450 ubc_init(); /* must be after autoconfig */ 451 452 /* Lock the kernel on behalf of proc0. */ 453 KERNEL_LOCK(1, l); 454 455 #ifdef SYSTRACE 456 systrace_init(); 457 #endif 458 459 #ifdef SYSVSHM 460 /* Initialize System V style shared memory. */ 461 shminit(); 462 #endif 463 464 #ifdef SYSVSEM 465 /* Initialize System V style semaphores. */ 466 seminit(); 467 #endif 468 469 #ifdef SYSVMSG 470 /* Initialize System V style message queues. */ 471 msginit(); 472 #endif 473 474 #ifdef P1003_1B_SEMAPHORE 475 /* Initialize posix semaphores */ 476 ksem_init(); 477 #endif 478 479 #if NVERIEXEC > 0 480 /* 481 * Initialise the Veriexec subsystem. 482 */ 483 veriexec_init(); 484 #endif /* NVERIEXEC > 0 */ 485 486 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 487 pax_init(); 488 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 489 490 /* Attach pseudo-devices. */ 491 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 492 (*pdev->pdev_attach)(pdev->pdev_count); 493 494 #ifdef FAST_IPSEC 495 /* Attach network crypto subsystem */ 496 ipsec_attach(); 497 #endif 498 499 /* 500 * Initialize protocols. Block reception of incoming packets 501 * until everything is ready. 502 */ 503 s = splnet(); 504 ifinit(); 505 domaininit(); 506 if_attachdomain(); 507 splx(s); 508 509 #ifdef GPROF 510 /* Initialize kernel profiling. */ 511 kmstartup(); 512 #endif 513 514 /* Initialize system accouting. */ 515 acct_init(); 516 517 #ifndef PIPE_SOCKETPAIR 518 /* Initialize pipes. */ 519 pipe_init(); 520 #endif 521 522 /* Setup the scheduler */ 523 sched_init(); 524 525 #ifdef KTRACE 526 /* Initialize ktrace. */ 527 ktrinit(); 528 #endif 529 530 /* Initialize the UUID system calls. */ 531 uuid_init(); 532 533 /* 534 * Create process 1 (init(8)). We do this now, as Unix has 535 * historically had init be process 1, and changing this would 536 * probably upset a lot of people. 537 * 538 * Note that process 1 won't immediately exec init(8), but will 539 * wait for us to inform it that the root file system has been 540 * mounted. 541 */ 542 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 543 panic("fork init"); 544 545 /* 546 * Now that device driver threads have been created, wait for 547 * them to finish any deferred autoconfiguration. Note we don't 548 * need to lock this semaphore, since we haven't booted any 549 * secondary processors, yet. 550 */ 551 while (config_pending) 552 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 553 554 /* 555 * Finalize configuration now that all real devices have been 556 * found. This needs to be done before the root device is 557 * selected, since finalization may create the root device. 558 */ 559 config_finalize(); 560 561 /* 562 * Now that autoconfiguration has completed, we can determine 563 * the root and dump devices. 564 */ 565 cpu_rootconf(); 566 cpu_dumpconf(); 567 568 /* Mount the root file system. */ 569 do { 570 domountroothook(); 571 if ((error = vfs_mountroot())) { 572 printf("cannot mount root, error = %d\n", error); 573 boothowto |= RB_ASKNAME; 574 setroot(root_device, 575 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 576 } 577 } while (error != 0); 578 mountroothook_destroy(); 579 580 /* 581 * Initialise the time-of-day clock, passing the time recorded 582 * in the root filesystem (if any) for use by systems that 583 * don't have a non-volatile time-of-day device. 584 */ 585 inittodr(rootfstime); 586 587 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 588 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 589 590 /* 591 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 592 * reference it. 593 */ 594 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 595 if (error) 596 panic("cannot find root vnode, error=%d", error); 597 cwdi0.cwdi_cdir = rootvnode; 598 VREF(cwdi0.cwdi_cdir); 599 VOP_UNLOCK(rootvnode, 0); 600 cwdi0.cwdi_rdir = NULL; 601 602 /* 603 * Now that root is mounted, we can fixup initproc's CWD 604 * info. All other processes are kthreads, which merely 605 * share proc0's CWD info. 606 */ 607 initproc->p_cwdi->cwdi_cdir = rootvnode; 608 VREF(initproc->p_cwdi->cwdi_cdir); 609 initproc->p_cwdi->cwdi_rdir = NULL; 610 611 /* 612 * Now can look at time, having had a chance to verify the time 613 * from the file system. Reset l->l_rtime as it may have been 614 * munched in mi_switch() after the time got set. 615 */ 616 #ifdef __HAVE_TIMECOUNTER 617 getmicrotime(&time); 618 #else 619 mono_time = time; 620 #endif 621 boottime = time; 622 mutex_enter(&proclist_lock); 623 LIST_FOREACH(p, &allproc, p_list) { 624 KASSERT((p->p_flag & PK_MARKER) == 0); 625 mutex_enter(&p->p_smutex); 626 p->p_stats->p_start = time; 627 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 628 lwp_lock(l); 629 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 630 lwp_unlock(l); 631 } 632 mutex_exit(&p->p_smutex); 633 } 634 mutex_exit(&proclist_lock); 635 curlwp->l_stime = time; 636 637 for (CPU_INFO_FOREACH(cii, ci)) { 638 ci->ci_schedstate.spc_lastmod = time_second; 639 } 640 641 /* Create the pageout daemon kernel thread. */ 642 uvm_swap_init(); 643 if (kthread_create(PVM, 0, NULL, uvm_pageout, 644 NULL, NULL, "pgdaemon")) 645 panic("fork pagedaemon"); 646 647 /* Create the filesystem syncer kernel thread. */ 648 if (kthread_create(PINOD, 0, NULL, sched_sync, NULL, NULL, "ioflush")) 649 panic("fork syncer"); 650 651 /* Create the aiodone daemon kernel thread. */ 652 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 653 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 654 panic("fork aiodoned"); 655 656 vmem_rehash_start(); 657 658 #if defined(MULTIPROCESSOR) 659 /* Boot the secondary processors. */ 660 cpu_boot_secondary_processors(); 661 #endif 662 663 /* Initialize exec structures */ 664 exec_init(1); 665 666 /* 667 * Okay, now we can let init(8) exec! It's off to userland! 668 */ 669 start_init_exec = 1; 670 wakeup(&start_init_exec); 671 672 /* The scheduler is an infinite loop. */ 673 uvm_scheduler(); 674 /* NOTREACHED */ 675 } 676 677 static void 678 check_console(struct lwp *l) 679 { 680 struct nameidata nd; 681 int error; 682 683 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 684 error = namei(&nd); 685 if (error == 0) 686 vrele(nd.ni_vp); 687 else if (error == ENOENT) 688 printf("warning: no /dev/console\n"); 689 else 690 printf("warning: lookup /dev/console: error %d\n", error); 691 } 692 693 /* 694 * List of paths to try when searching for "init". 695 */ 696 static const char *initpaths[] = { 697 "/sbin/init", 698 "/sbin/oinit", 699 "/sbin/init.bak", 700 NULL, 701 }; 702 703 /* 704 * Start the initial user process; try exec'ing each pathname in "initpaths". 705 * The program is invoked with one argument containing the boot flags. 706 */ 707 static void 708 start_init(void *arg) 709 { 710 struct lwp *l = arg; 711 struct proc *p = l->l_proc; 712 vaddr_t addr; 713 struct sys_execve_args /* { 714 syscallarg(const char *) path; 715 syscallarg(char * const *) argp; 716 syscallarg(char * const *) envp; 717 } */ args; 718 int options, i, error; 719 register_t retval[2]; 720 char flags[4], *flagsp; 721 const char *path, *slash; 722 char *ucp, **uap, *arg0, *arg1 = NULL; 723 char ipath[129]; 724 int ipx, len; 725 726 /* 727 * Now in process 1. 728 */ 729 strncpy(p->p_comm, "init", MAXCOMLEN); 730 731 /* 732 * Wait for main() to tell us that it's safe to exec. 733 */ 734 while (start_init_exec == 0) 735 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 736 737 /* 738 * This is not the right way to do this. We really should 739 * hand-craft a descriptor onto /dev/console to hand to init, 740 * but that's a _lot_ more work, and the benefit from this easy 741 * hack makes up for the "good is the enemy of the best" effect. 742 */ 743 check_console(l); 744 745 /* 746 * Need just enough stack to hold the faked-up "execve()" arguments. 747 */ 748 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 749 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 750 NULL, UVM_UNKNOWN_OFFSET, 0, 751 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 752 UVM_ADV_NORMAL, 753 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 754 panic("init: couldn't allocate argument space"); 755 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 756 757 ipx = 0; 758 while (1) { 759 if (boothowto & RB_ASKNAME) { 760 printf("init path"); 761 if (initpaths[ipx]) 762 printf(" (default %s)", initpaths[ipx]); 763 printf(": "); 764 len = cngetsn(ipath, sizeof(ipath)-1); 765 if (len == 0) { 766 if (initpaths[ipx]) 767 path = initpaths[ipx++]; 768 else 769 continue; 770 } else { 771 ipath[len] = '\0'; 772 path = ipath; 773 } 774 } else { 775 if ((path = initpaths[ipx++]) == NULL) 776 break; 777 } 778 779 ucp = (char *)USRSTACK; 780 781 /* 782 * Construct the boot flag argument. 783 */ 784 flagsp = flags; 785 *flagsp++ = '-'; 786 options = 0; 787 788 if (boothowto & RB_SINGLE) { 789 *flagsp++ = 's'; 790 options = 1; 791 } 792 #ifdef notyet 793 if (boothowto & RB_FASTBOOT) { 794 *flagsp++ = 'f'; 795 options = 1; 796 } 797 #endif 798 799 /* 800 * Move out the flags (arg 1), if necessary. 801 */ 802 if (options != 0) { 803 *flagsp++ = '\0'; 804 i = flagsp - flags; 805 #ifdef DEBUG 806 printf("init: copying out flags `%s' %d\n", flags, i); 807 #endif 808 arg1 = STACK_ALLOC(ucp, i); 809 ucp = STACK_MAX(arg1, i); 810 (void)copyout((void *)flags, arg1, i); 811 } 812 813 /* 814 * Move out the file name (also arg 0). 815 */ 816 i = strlen(path) + 1; 817 #ifdef DEBUG 818 printf("init: copying out path `%s' %d\n", path, i); 819 #else 820 if (boothowto & RB_ASKNAME || path != initpaths[0]) 821 printf("init: trying %s\n", path); 822 #endif 823 arg0 = STACK_ALLOC(ucp, i); 824 ucp = STACK_MAX(arg0, i); 825 (void)copyout(path, arg0, i); 826 827 /* 828 * Move out the arg pointers. 829 */ 830 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 831 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 832 SCARG(&args, path) = arg0; 833 SCARG(&args, argp) = uap; 834 SCARG(&args, envp) = NULL; 835 slash = strrchr(path, '/'); 836 if (slash) 837 (void)suword((void *)uap++, 838 (long)arg0 + (slash + 1 - path)); 839 else 840 (void)suword((void *)uap++, (long)arg0); 841 if (options != 0) 842 (void)suword((void *)uap++, (long)arg1); 843 (void)suword((void *)uap++, 0); /* terminator */ 844 845 /* 846 * Now try to exec the program. If can't for any reason 847 * other than it doesn't exist, complain. 848 */ 849 error = sys_execve(l, &args, retval); 850 if (error == 0 || error == EJUSTRETURN) { 851 KERNEL_UNLOCK_LAST(l); 852 return; 853 } 854 printf("exec %s: error %d\n", path, error); 855 } 856 printf("init: not found\n"); 857 panic("no init"); 858 } 859
Indexes created Mon Sep 22 13:09:51 GMT 2025