init_main.c revision 1.343
1 /* $NetBSD: init_main.c,v 1.343 2008/03/21 21:55:00 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 1.343 2008/03/21 21:55:00 ad Exp $"); 75 76 #include "opt_ipsec.h" 77 #include "opt_ntp.h" 78 #include "opt_pipe.h" 79 #include "opt_posix.h" 80 #include "opt_syscall_debug.h" 81 #include "opt_sysv.h" 82 #include "opt_fileassoc.h" 83 #include "opt_ktrace.h" 84 #include "opt_pax.h" 85 86 #include "rnd.h" 87 #include "sysmon_envsys.h" 88 #include "sysmon_power.h" 89 #include "sysmon_taskq.h" 90 #include "sysmon_wdog.h" 91 #include "veriexec.h" 92 93 #include <sys/param.h> 94 #include <sys/acct.h> 95 #include <sys/filedesc.h> 96 #include <sys/file.h> 97 #include <sys/errno.h> 98 #include <sys/callout.h> 99 #include <sys/cpu.h> 100 #include <sys/kernel.h> 101 #include <sys/kmem.h> 102 #include <sys/mount.h> 103 #include <sys/proc.h> 104 #include <sys/kthread.h> 105 #include <sys/resourcevar.h> 106 #include <sys/signalvar.h> 107 #include <sys/systm.h> 108 #include <sys/vnode.h> 109 #include <sys/fstrans.h> 110 #include <sys/tty.h> 111 #include <sys/conf.h> 112 #include <sys/disklabel.h> 113 #include <sys/buf.h> 114 #include <sys/device.h> 115 #include <sys/exec.h> 116 #include <sys/socketvar.h> 117 #include <sys/protosw.h> 118 #include <sys/percpu.h> 119 #include <sys/pset.h> 120 #include <sys/sysctl.h> 121 #include <sys/reboot.h> 122 #include <sys/user.h> 123 #include <sys/sysctl.h> 124 #include <sys/event.h> 125 #include <sys/mbuf.h> 126 #include <sys/sched.h> 127 #include <sys/sleepq.h> 128 #include <sys/iostat.h> 129 #include <sys/vmem.h> 130 #include <sys/uuid.h> 131 #include <sys/extent.h> 132 #include <sys/disk.h> 133 #include <sys/mqueue.h> 134 #include <sys/msgbuf.h> 135 #include <sys/module.h> 136 #include <sys/event.h> 137 #ifdef FAST_IPSEC 138 #include <netipsec/ipsec.h> 139 #endif 140 #ifdef SYSVSHM 141 #include <sys/shm.h> 142 #endif 143 #ifdef SYSVSEM 144 #include <sys/sem.h> 145 #endif 146 #ifdef SYSVMSG 147 #include <sys/msg.h> 148 #endif 149 #ifdef P1003_1B_SEMAPHORE 150 #include <sys/ksem.h> 151 #endif 152 #include <sys/domain.h> 153 #include <sys/namei.h> 154 #if NRND > 0 155 #include <sys/rnd.h> 156 #endif 157 #include <sys/pipe.h> 158 #ifdef LKM 159 #include <sys/lkm.h> 160 #endif 161 #if NVERIEXEC > 0 162 #include <sys/verified_exec.h> 163 #endif /* NVERIEXEC > 0 */ 164 #ifdef KTRACE 165 #include <sys/ktrace.h> 166 #endif 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) || defined(PAX_ASLR) 174 #include <sys/pax.h> 175 #endif /* PAX_MPROTECT || PAX_SEGVGUARD || PAX_ASLR */ 176 177 #include <ufs/ufs/quota.h> 178 179 #include <miscfs/genfs/genfs.h> 180 #include <miscfs/syncfs/syncfs.h> 181 182 #include <sys/cpu.h> 183 184 #include <uvm/uvm.h> 185 186 #if NSYSMON_TASKQ > 0 187 #include <dev/sysmon/sysmon_taskq.h> 188 #endif 189 190 #include <dev/cons.h> 191 192 #if NSYSMON_ENVSYS > 0 || NSYSMON_POWER > 0 || NSYSMON_WDOG > 0 193 #include <dev/sysmon/sysmonvar.h> 194 #endif 195 196 #include <net/if.h> 197 #include <net/raw_cb.h> 198 199 #include <secmodel/secmodel.h> 200 201 extern struct proc proc0; 202 extern struct lwp lwp0; 203 extern struct cwdinfo cwdi0; 204 extern time_t rootfstime; 205 206 #ifndef curlwp 207 struct lwp *curlwp = &lwp0; 208 #endif 209 struct proc *initproc; 210 211 struct vnode *rootvp, *swapdev_vp; 212 int boothowto; 213 int cold = 1; /* still working on startup */ 214 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 215 216 volatile int start_init_exec; /* semaphore for start_init() */ 217 218 static void check_console(struct lwp *l); 219 static void start_init(void *); 220 void main(void); 221 222 #if defined(__SSP__) || defined(__SSP_ALL__) 223 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 224 void __stack_chk_fail(void); 225 226 void 227 __stack_chk_fail(void) 228 { 229 panic("stack overflow detected; terminated"); 230 } 231 #endif 232 233 void __secmodel_none(void); 234 __weak_alias(secmodel_start,__secmodel_none); 235 void 236 __secmodel_none(void) 237 { 238 return; 239 } 240 241 /* 242 * System startup; initialize the world, create process 0, mount root 243 * filesystem, and fork to create init and pagedaemon. Most of the 244 * hard work is done in the lower-level initialization routines including 245 * startup(), which does memory initialization and autoconfiguration. 246 */ 247 void 248 main(void) 249 { 250 struct timeval time; 251 struct lwp *l; 252 struct proc *p; 253 struct pdevinit *pdev; 254 int s, error; 255 extern struct pdevinit pdevinit[]; 256 #ifdef NVNODE_IMPLICIT 257 int usevnodes; 258 #endif 259 CPU_INFO_ITERATOR cii; 260 struct cpu_info *ci; 261 262 l = &lwp0; 263 #ifndef LWP0_CPU_INFO 264 l->l_cpu = curcpu(); 265 #endif 266 267 /* 268 * Attempt to find console and initialize 269 * in case of early panic or other messages. 270 */ 271 consinit(); 272 273 kernel_lock_init(); 274 275 uvm_init(); 276 277 kmem_init(); 278 279 percpu_init(); 280 281 /* Initialize the extent manager. */ 282 extent_init(); 283 284 /* Do machine-dependent initialization. */ 285 cpu_startup(); 286 287 /* Start module system. */ 288 module_init(); 289 290 /* Initialize callouts, part 1. */ 291 callout_startup(); 292 293 /* 294 * Initialize the kernel authorization subsystem and start the 295 * default security model, if any. We need to do this early 296 * enough so that subsystems relying on any of the aforementioned 297 * can work properly. Since the security model may dictate the 298 * credential inheritance policy, it is needed at least before 299 * any process is created, specifically proc0. 300 */ 301 kauth_init(); 302 secmodel_start(); 303 304 /* Initialize the buffer cache */ 305 bufinit(); 306 307 /* Initialize sockets. */ 308 soinit(); 309 310 /* 311 * The following things must be done before autoconfiguration. 312 */ 313 evcnt_init(); /* initialize event counters */ 314 #if NRND > 0 315 rnd_init(); /* initialize RNG */ 316 #endif 317 318 /* Initialize process and pgrp structures. */ 319 procinit(); 320 lwpinit(); 321 322 /* Initialize signal-related data structures. */ 323 signal_init(); 324 325 /* Initialize resource management. */ 326 resource_init(); 327 328 /* Create process 0 (the swapper). */ 329 proc0_init(); 330 331 /* Initialize the UID hash table. */ 332 uid_init(); 333 334 /* Charge root for one process. */ 335 (void)chgproccnt(0, 1); 336 337 /* Initialize timekeeping. */ 338 time_init(); 339 340 /* Initialize the run queues, turnstiles and sleep queues. */ 341 mutex_init(&cpu_lock, MUTEX_DEFAULT, IPL_NONE); 342 sched_rqinit(); 343 turnstile_init(); 344 sleeptab_init(&sleeptab); 345 346 /* Initialize processor-sets */ 347 psets_init(); 348 349 /* MI initialization of the boot cpu */ 350 error = mi_cpu_attach(curcpu()); 351 KASSERT(error == 0); 352 353 /* 354 * Initialize mbuf's. Do this now because we might attempt to 355 * allocate mbufs or mbuf clusters during autoconfiguration. 356 */ 357 mbinit(); 358 359 /* Initialize the sysctl subsystem. */ 360 sysctl_init(); 361 362 /* Initialize I/O statistics. */ 363 iostat_init(); 364 365 /* Initialize the log device. */ 366 loginit(); 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 fd_sys_init(); 386 387 /* Initialize the select()/poll() system calls, and kqueue. */ 388 selsysinit(); 389 kqueue_init(); 390 391 /* Initialize asynchronous I/O. */ 392 aio_sysinit(); 393 394 /* Initialize message queues. */ 395 mqueue_sysinit(); 396 397 /* Initialize the system monitor subsystems. */ 398 #if NSYSMON_TASKQ > 0 399 sysmon_task_queue_preinit(); 400 #endif 401 402 #if NSYSMON_ENVSYS > 0 403 sysmon_envsys_init(); 404 #endif 405 406 #if NSYSMON_POWER > 0 407 sysmon_power_init(); 408 #endif 409 410 #if NSYSMON_WDOG > 0 411 sysmon_wdog_init(); 412 #endif 413 414 inittimecounter(); 415 ntp_init(); 416 417 /* Initialize the device switch tables. */ 418 devsw_init(); 419 420 /* Initialize tty subsystem. */ 421 tty_init(); 422 ttyldisc_init(); 423 424 /* Initialize the buffer cache, part 2. */ 425 bufinit2(); 426 427 /* Initialize the disk wedge subsystem. */ 428 dkwedge_init(); 429 430 /* Configure the system hardware. This will enable interrupts. */ 431 configure(); 432 433 #if defined(__SSP__) || defined(__SSP_ALL__) 434 { 435 #ifdef DIAGNOSTIC 436 printf("Initializing SSP:"); 437 #endif 438 /* 439 * We initialize ssp here carefully: 440 * 1. after we got some entropy 441 * 2. without calling a function 442 */ 443 size_t i; 444 long guard[__arraycount(__stack_chk_guard)]; 445 446 arc4randbytes(guard, sizeof(guard)); 447 for (i = 0; i < __arraycount(guard); i++) 448 __stack_chk_guard[i] = guard[i]; 449 #ifdef DIAGNOSTIC 450 for (i = 0; i < __arraycount(guard); i++) 451 printf("%lx ", guard[i]); 452 printf("\n"); 453 #endif 454 } 455 #endif 456 ubc_init(); /* must be after autoconfig */ 457 458 /* Lock the kernel on behalf of proc0. */ 459 KERNEL_LOCK(1, l); 460 461 #ifdef SYSVSHM 462 /* Initialize System V style shared memory. */ 463 shminit(); 464 #endif 465 466 #ifdef SYSVSEM 467 /* Initialize System V style semaphores. */ 468 seminit(); 469 #endif 470 471 #ifdef SYSVMSG 472 /* Initialize System V style message queues. */ 473 msginit(); 474 #endif 475 476 #ifdef P1003_1B_SEMAPHORE 477 /* Initialize posix semaphores */ 478 ksem_init(); 479 #endif 480 481 #if NVERIEXEC > 0 482 /* 483 * Initialise the Veriexec subsystem. 484 */ 485 veriexec_init(); 486 #endif /* NVERIEXEC > 0 */ 487 488 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) || defined(PAX_ASLR) 489 pax_init(); 490 #endif /* PAX_MPROTECT || PAX_SEGVGUARD || PAX_ASLR */ 491 492 /* Attach pseudo-devices. */ 493 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 494 (*pdev->pdev_attach)(pdev->pdev_count); 495 496 #ifdef FAST_IPSEC 497 /* Attach network crypto subsystem */ 498 ipsec_attach(); 499 #endif 500 501 /* 502 * Initialize protocols. Block reception of incoming packets 503 * until everything is ready. 504 */ 505 s = splnet(); 506 ifinit(); 507 domaininit(); 508 if_attachdomain(); 509 splx(s); 510 511 #ifdef GPROF 512 /* Initialize kernel profiling. */ 513 kmstartup(); 514 #endif 515 516 /* Initialize system accouting. */ 517 acct_init(); 518 519 #ifndef PIPE_SOCKETPAIR 520 /* Initialize pipes. */ 521 pipe_init(); 522 #endif 523 524 /* Setup the scheduler */ 525 sched_init(); 526 527 #ifdef KTRACE 528 /* Initialize ktrace. */ 529 ktrinit(); 530 #endif 531 532 /* Initialize the UUID system calls. */ 533 uuid_init(); 534 535 /* 536 * Create process 1 (init(8)). We do this now, as Unix has 537 * historically had init be process 1, and changing this would 538 * probably upset a lot of people. 539 * 540 * Note that process 1 won't immediately exec init(8), but will 541 * wait for us to inform it that the root file system has been 542 * mounted. 543 */ 544 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 545 panic("fork init"); 546 547 /* 548 * Now that device driver threads have been created, wait for 549 * them to finish any deferred autoconfiguration. 550 */ 551 while (config_pending) 552 (void) tsleep(&config_pending, PWAIT, "cfpend", hz); 553 554 /* 555 * Load any remaining builtin modules, and hand back temporary 556 * storage to the VM system. 557 */ 558 module_init_class(MODULE_CLASS_ANY); 559 module_jettison(); 560 561 /* 562 * Finalize configuration now that all real devices have been 563 * found. This needs to be done before the root device is 564 * selected, since finalization may create the root device. 565 */ 566 config_finalize(); 567 568 /* 569 * Now that autoconfiguration has completed, we can determine 570 * the root and dump devices. 571 */ 572 cpu_rootconf(); 573 cpu_dumpconf(); 574 575 /* Mount the root file system. */ 576 do { 577 domountroothook(); 578 if ((error = vfs_mountroot())) { 579 printf("cannot mount root, error = %d\n", error); 580 boothowto |= RB_ASKNAME; 581 setroot(root_device, 582 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 583 } 584 } while (error != 0); 585 mountroothook_destroy(); 586 587 /* 588 * Initialise the time-of-day clock, passing the time recorded 589 * in the root filesystem (if any) for use by systems that 590 * don't have a non-volatile time-of-day device. 591 */ 592 inittodr(rootfstime); 593 594 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 595 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 596 597 /* 598 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 599 * reference it. 600 */ 601 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 602 if (error) 603 panic("cannot find root vnode, error=%d", error); 604 cwdi0.cwdi_cdir = rootvnode; 605 VREF(cwdi0.cwdi_cdir); 606 VOP_UNLOCK(rootvnode, 0); 607 cwdi0.cwdi_rdir = NULL; 608 609 /* 610 * Now that root is mounted, we can fixup initproc's CWD 611 * info. All other processes are kthreads, which merely 612 * share proc0's CWD info. 613 */ 614 initproc->p_cwdi->cwdi_cdir = rootvnode; 615 VREF(initproc->p_cwdi->cwdi_cdir); 616 initproc->p_cwdi->cwdi_rdir = NULL; 617 618 /* 619 * Now can look at time, having had a chance to verify the time 620 * from the file system. Reset l->l_rtime as it may have been 621 * munched in mi_switch() after the time got set. 622 */ 623 getmicrotime(&time); 624 boottime = time; 625 mutex_enter(&proclist_lock); 626 LIST_FOREACH(p, &allproc, p_list) { 627 KASSERT((p->p_flag & PK_MARKER) == 0); 628 mutex_enter(&p->p_smutex); 629 p->p_stats->p_start = time; 630 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 631 lwp_lock(l); 632 memset(&l->l_rtime, 0, sizeof(l->l_rtime)); 633 lwp_unlock(l); 634 } 635 mutex_exit(&p->p_smutex); 636 } 637 mutex_exit(&proclist_lock); 638 binuptime(&curlwp->l_stime); 639 640 for (CPU_INFO_FOREACH(cii, ci)) { 641 ci->ci_schedstate.spc_lastmod = time_second; 642 } 643 644 /* Create the pageout daemon kernel thread. */ 645 uvm_swap_init(); 646 if (kthread_create(PRI_PGDAEMON, KTHREAD_MPSAFE, NULL, uvm_pageout, 647 NULL, NULL, "pgdaemon")) 648 panic("fork pagedaemon"); 649 650 /* Create the filesystem syncer kernel thread. */ 651 if (kthread_create(PRI_IOFLUSH, KTHREAD_MPSAFE, NULL, sched_sync, 652 NULL, NULL, "ioflush")) 653 panic("fork syncer"); 654 655 /* Create the aiodone daemon kernel thread. */ 656 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 657 uvm_aiodone_worker, NULL, PRI_VM, IPL_NONE, WQ_MPSAFE)) 658 panic("fork aiodoned"); 659 660 vmem_rehash_start(); 661 662 /* Initialize exec structures */ 663 exec_init(1); 664 665 /* 666 * Okay, now we can let init(8) exec! It's off to userland! 667 */ 668 start_init_exec = 1; 669 wakeup(&start_init_exec); 670 671 /* The scheduler is an infinite loop. */ 672 uvm_scheduler(); 673 /* NOTREACHED */ 674 } 675 676 static void 677 check_console(struct lwp *l) 678 { 679 struct nameidata nd; 680 int error; 681 682 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console"); 683 error = namei(&nd); 684 if (error == 0) 685 vrele(nd.ni_vp); 686 else if (error == ENOENT) 687 printf("warning: no /dev/console\n"); 688 else 689 printf("warning: lookup /dev/console: error %d\n", error); 690 } 691 692 /* 693 * List of paths to try when searching for "init". 694 */ 695 static const char * const initpaths[] = { 696 "/sbin/init", 697 "/sbin/oinit", 698 "/sbin/init.bak", 699 NULL, 700 }; 701 702 /* 703 * Start the initial user process; try exec'ing each pathname in "initpaths". 704 * The program is invoked with one argument containing the boot flags. 705 */ 706 static void 707 start_init(void *arg) 708 { 709 struct lwp *l = arg; 710 struct proc *p = l->l_proc; 711 vaddr_t addr; 712 struct sys_execve_args /* { 713 syscallarg(const char *) path; 714 syscallarg(char * const *) argp; 715 syscallarg(char * const *) envp; 716 } */ args; 717 int options, i, error; 718 register_t retval[2]; 719 char flags[4], *flagsp; 720 const char *path, *slash; 721 char *ucp, **uap, *arg0, *arg1 = NULL; 722 char ipath[129]; 723 int ipx, len; 724 725 /* 726 * Now in process 1. 727 */ 728 strncpy(p->p_comm, "init", MAXCOMLEN); 729 730 /* 731 * Wait for main() to tell us that it's safe to exec. 732 */ 733 while (start_init_exec == 0) 734 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 735 736 /* 737 * This is not the right way to do this. We really should 738 * hand-craft a descriptor onto /dev/console to hand to init, 739 * but that's a _lot_ more work, and the benefit from this easy 740 * hack makes up for the "good is the enemy of the best" effect. 741 */ 742 check_console(l); 743 744 /* 745 * Need just enough stack to hold the faked-up "execve()" arguments. 746 */ 747 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 748 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 749 NULL, UVM_UNKNOWN_OFFSET, 0, 750 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 751 UVM_ADV_NORMAL, 752 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 753 panic("init: couldn't allocate argument space"); 754 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 755 756 ipx = 0; 757 while (1) { 758 if (boothowto & RB_ASKNAME) { 759 printf("init path"); 760 if (initpaths[ipx]) 761 printf(" (default %s)", initpaths[ipx]); 762 printf(": "); 763 len = cngetsn(ipath, sizeof(ipath)-1); 764 if (len == 0) { 765 if (initpaths[ipx]) 766 path = initpaths[ipx++]; 767 else 768 continue; 769 } else { 770 ipath[len] = '\0'; 771 path = ipath; 772 } 773 } else { 774 if ((path = initpaths[ipx++]) == NULL) 775 break; 776 } 777 778 ucp = (char *)USRSTACK; 779 780 /* 781 * Construct the boot flag argument. 782 */ 783 flagsp = flags; 784 *flagsp++ = '-'; 785 options = 0; 786 787 if (boothowto & RB_SINGLE) { 788 *flagsp++ = 's'; 789 options = 1; 790 } 791 #ifdef notyet 792 if (boothowto & RB_FASTBOOT) { 793 *flagsp++ = 'f'; 794 options = 1; 795 } 796 #endif 797 798 /* 799 * Move out the flags (arg 1), if necessary. 800 */ 801 if (options != 0) { 802 *flagsp++ = '\0'; 803 i = flagsp - flags; 804 #ifdef DEBUG 805 printf("init: copying out flags `%s' %d\n", flags, i); 806 #endif 807 arg1 = STACK_ALLOC(ucp, i); 808 ucp = STACK_MAX(arg1, i); 809 (void)copyout((void *)flags, arg1, i); 810 } 811 812 /* 813 * Move out the file name (also arg 0). 814 */ 815 i = strlen(path) + 1; 816 #ifdef DEBUG 817 printf("init: copying out path `%s' %d\n", path, i); 818 #else 819 if (boothowto & RB_ASKNAME || path != initpaths[0]) 820 printf("init: trying %s\n", path); 821 #endif 822 arg0 = STACK_ALLOC(ucp, i); 823 ucp = STACK_MAX(arg0, i); 824 (void)copyout(path, arg0, i); 825 826 /* 827 * Move out the arg pointers. 828 */ 829 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 830 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 831 SCARG(&args, path) = arg0; 832 SCARG(&args, argp) = uap; 833 SCARG(&args, envp) = NULL; 834 slash = strrchr(path, '/'); 835 if (slash) 836 (void)suword((void *)uap++, 837 (long)arg0 + (slash + 1 - path)); 838 else 839 (void)suword((void *)uap++, (long)arg0); 840 if (options != 0) 841 (void)suword((void *)uap++, (long)arg1); 842 (void)suword((void *)uap++, 0); /* terminator */ 843 844 /* 845 * Now try to exec the program. If can't for any reason 846 * other than it doesn't exist, complain. 847 */ 848 error = sys_execve(l, &args, retval); 849 if (error == 0 || error == EJUSTRETURN) { 850 KERNEL_UNLOCK_LAST(l); 851 return; 852 } 853 printf("exec %s: error %d\n", path, error); 854 } 855 printf("init: not found\n"); 856 panic("no init"); 857 } 858
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