init_main.c revision 1.296
1 /* $NetBSD: init_main.c,v 1.296 2007/03/03 10:08:18 itohy 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 1.296 2007/03/03 10:08:18 itohy Exp $"); 75 76 #include "opt_ipsec.h" 77 #include "opt_kcont.h" 78 #include "opt_multiprocessor.h" 79 #include "opt_ntp.h" 80 #include "opt_pipe.h" 81 #include "opt_posix.h" 82 #include "opt_syscall_debug.h" 83 #include "opt_sysv.h" 84 #include "opt_systrace.h" 85 #include "opt_fileassoc.h" 86 #include "opt_ktrace.h" 87 #include "opt_pax.h" 88 89 #include "rnd.h" 90 #include "veriexec.h" 91 92 #include <sys/param.h> 93 #include <sys/acct.h> 94 #include <sys/filedesc.h> 95 #include <sys/file.h> 96 #include <sys/errno.h> 97 #include <sys/callout.h> 98 #include <sys/kernel.h> 99 #include <sys/kcont.h> 100 #include <sys/kmem.h> 101 #include <sys/mount.h> 102 #include <sys/proc.h> 103 #include <sys/kthread.h> 104 #include <sys/resourcevar.h> 105 #include <sys/signalvar.h> 106 #include <sys/systm.h> 107 #include <sys/vnode.h> 108 #include <sys/fstrans.h> 109 #include <sys/tty.h> 110 #include <sys/conf.h> 111 #include <sys/disklabel.h> 112 #include <sys/buf.h> 113 #include <sys/device.h> 114 #include <sys/exec.h> 115 #include <sys/socketvar.h> 116 #include <sys/protosw.h> 117 #include <sys/reboot.h> 118 #include <sys/user.h> 119 #include <sys/sysctl.h> 120 #include <sys/event.h> 121 #include <sys/mbuf.h> 122 #include <sys/sleepq.h> 123 #include <sys/iostat.h> 124 #ifdef FAST_IPSEC 125 #include <netipsec/ipsec.h> 126 #endif 127 #ifdef SYSVSHM 128 #include <sys/shm.h> 129 #endif 130 #ifdef SYSVSEM 131 #include <sys/sem.h> 132 #endif 133 #ifdef SYSVMSG 134 #include <sys/msg.h> 135 #endif 136 #ifdef SYSTRACE 137 #include <sys/systrace.h> 138 #endif 139 #ifdef P1003_1B_SEMAPHORE 140 #include <sys/ksem.h> 141 #endif 142 #include <sys/domain.h> 143 #include <sys/namei.h> 144 #if NRND > 0 145 #include <sys/rnd.h> 146 #endif 147 #ifndef PIPE_SOCKETPAIR 148 #include <sys/pipe.h> 149 #endif 150 #ifdef LKM 151 #include <sys/lkm.h> 152 #endif 153 #if NVERIEXEC > 0 154 #include <sys/verified_exec.h> 155 #endif /* NVERIEXEC > 0 */ 156 #ifdef KTRACE 157 #include <sys/ktrace.h> 158 #endif 159 #include <sys/lockdebug.h> 160 #include <sys/debug.h> 161 #include <sys/kauth.h> 162 #include <net80211/ieee80211_netbsd.h> 163 164 #include <sys/syscall.h> 165 #include <sys/syscallargs.h> 166 167 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 168 #include <sys/pax.h> 169 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 170 #include <ufs/ufs/quota.h> 171 172 #include <miscfs/genfs/genfs.h> 173 #include <miscfs/syncfs/syncfs.h> 174 175 #include <machine/cpu.h> 176 177 #include <uvm/uvm.h> 178 179 #include <dev/cons.h> 180 181 #include <net/if.h> 182 #include <net/raw_cb.h> 183 184 #include <secmodel/secmodel.h> 185 186 extern struct proc proc0; 187 extern struct lwp lwp0; 188 extern struct cwdinfo cwdi0; 189 190 #ifndef curlwp 191 struct lwp *curlwp = &lwp0; 192 #endif 193 struct proc *initproc; 194 195 struct vnode *rootvp, *swapdev_vp; 196 int boothowto; 197 int cold = 1; /* still working on startup */ 198 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 199 time_t rootfstime; /* recorded root fs time, if known */ 200 int ncpu = 1; /* number of CPUs configured, assume 1 */ 201 202 volatile int start_init_exec; /* semaphore for start_init() */ 203 204 static void check_console(struct lwp *l); 205 static void start_init(void *); 206 void main(void); 207 208 #if defined(__SSP__) || defined(__SSP_ALL__) 209 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 210 void __stack_chk_fail(void); 211 212 void 213 __stack_chk_fail(void) 214 { 215 panic("stack overflow detected; terminated"); 216 } 217 #endif 218 219 void __secmodel_none(void); 220 __weak_alias(secmodel_start,__secmodel_none); 221 void 222 __secmodel_none(void) 223 { 224 return; 225 } 226 227 /* 228 * System startup; initialize the world, create process 0, mount root 229 * filesystem, and fork to create init and pagedaemon. Most of the 230 * hard work is done in the lower-level initialization routines including 231 * startup(), which does memory initialization and autoconfiguration. 232 */ 233 void 234 main(void) 235 { 236 #ifdef __HAVE_TIMECOUNTER 237 struct timeval time; 238 #endif 239 struct lwp *l; 240 struct proc *p; 241 struct pdevinit *pdev; 242 int s, error; 243 extern struct pdevinit pdevinit[]; 244 extern void schedcpu(void *); 245 #ifdef NVNODE_IMPLICIT 246 int usevnodes; 247 #endif 248 #ifdef MULTIPROCESSOR 249 CPU_INFO_ITERATOR cii; 250 struct cpu_info *ci; 251 #endif 252 253 /* 254 * Initialize the current LWP pointer (curlwp) before 255 * any possible traps/probes to simplify trap processing. 256 */ 257 l = &lwp0; 258 curlwp = l; 259 l->l_cpu = curcpu(); 260 l->l_proc = &proc0; 261 l->l_lid = 1; 262 263 #ifdef LOCKDEBUG 264 lockdebug_init(); 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 #ifdef DEBUG 278 debug_init(); 279 #endif 280 281 kmem_init(); 282 283 /* Do machine-dependent initialization. */ 284 cpu_startup(); 285 286 /* Initialize callouts. */ 287 callout_startup(); 288 289 /* 290 * Initialize the kernel authorization subsystem and start the 291 * default security model, if any. We need to do this early 292 * enough so that subsystems relying on any of the aforementioned 293 * can work properly. Since the security model may dictate the 294 * credential inheritance policy, it is needed at least before 295 * any process is created, specifically proc0. 296 */ 297 kauth_init(); 298 secmodel_start(); 299 300 /* Initialize the buffer cache */ 301 bufinit(); 302 303 /* 304 * Initialize mbuf's. Do this now because we might attempt to 305 * allocate mbufs or mbuf clusters during autoconfiguration. 306 */ 307 mbinit(); 308 309 /* Initialize sockets. */ 310 soinit(); 311 312 #ifdef KCONT 313 /* Initialize kcont. */ 314 kcont_init(); 315 #endif 316 317 /* 318 * The following things must be done before autoconfiguration. 319 */ 320 evcnt_init(); /* initialize event counters */ 321 #if NRND > 0 322 rnd_init(); /* initialize RNG */ 323 #endif 324 325 /* Initialize process and pgrp structures. */ 326 procinit(); 327 lwpinit(); 328 329 /* Initialize signal-related data structures. */ 330 signal_init(); 331 332 /* Create process 0 (the swapper). */ 333 proc0_init(); 334 335 /* 336 * Charge root for one process. 337 */ 338 (void)chgproccnt(0, 1); 339 340 /* Initialize the run queues, turnstiles and sleep queues. */ 341 rqinit(); 342 turnstile_init(); 343 sleeptab_init(&sleeptab); 344 345 /* Initialize the sysctl subsystem. */ 346 sysctl_init(); 347 348 /* Initialize I/O statistics. */ 349 iostat_init(); 350 351 /* Initialize the file systems. */ 352 #ifdef NVNODE_IMPLICIT 353 /* 354 * If maximum number of vnodes in namei vnode cache is not explicitly 355 * defined in kernel config, adjust the number such as we use roughly 356 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 357 */ 358 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 359 if (usevnodes > desiredvnodes) 360 desiredvnodes = usevnodes; 361 #endif 362 vfsinit(); 363 364 /* Initialize fstrans. */ 365 fstrans_init(); 366 367 #ifdef __HAVE_TIMECOUNTER 368 inittimecounter(); 369 ntp_init(); 370 #endif /* __HAVE_TIMECOUNTER */ 371 372 /* Configure the system hardware. This will enable interrupts. */ 373 configure(); 374 375 #if defined(__SSP__) || defined(__SSP_ALL__) 376 { 377 #ifdef DIAGNOSTIC 378 printf("Initializing SSP:"); 379 #endif 380 /* 381 * We initialize ssp here carefully: 382 * 1. after we got some entropy 383 * 2. without calling a function 384 */ 385 size_t i; 386 long guard[__arraycount(__stack_chk_guard)]; 387 388 arc4randbytes(guard, sizeof(guard)); 389 for (i = 0; i < __arraycount(guard); i++) 390 __stack_chk_guard[i] = guard[i]; 391 #ifdef DIAGNOSTIC 392 for (i = 0; i < __arraycount(guard); i++) 393 printf("%lx ", guard[i]); 394 printf("\n"); 395 #endif 396 } 397 #endif 398 ubc_init(); /* must be after autoconfig */ 399 400 /* Lock the kernel on behalf of proc0. */ 401 KERNEL_LOCK(1, l); 402 403 #ifdef SYSTRACE 404 systrace_init(); 405 #endif 406 407 #ifdef SYSVSHM 408 /* Initialize System V style shared memory. */ 409 shminit(); 410 #endif 411 412 #ifdef SYSVSEM 413 /* Initialize System V style semaphores. */ 414 seminit(); 415 #endif 416 417 #ifdef SYSVMSG 418 /* Initialize System V style message queues. */ 419 msginit(); 420 #endif 421 422 #ifdef P1003_1B_SEMAPHORE 423 /* Initialize posix semaphores */ 424 ksem_init(); 425 #endif 426 427 #if NVERIEXEC > 0 428 /* 429 * Initialise the Veriexec subsystem. 430 */ 431 veriexec_init(); 432 #endif /* NVERIEXEC > 0 */ 433 434 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 435 pax_init(); 436 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 437 438 /* Attach pseudo-devices. */ 439 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 440 (*pdev->pdev_attach)(pdev->pdev_count); 441 442 #ifdef FAST_IPSEC 443 /* Attach network crypto subsystem */ 444 ipsec_attach(); 445 #endif 446 447 /* 448 * Initialize protocols. Block reception of incoming packets 449 * until everything is ready. 450 */ 451 s = splnet(); 452 ifinit(); 453 domaininit(); 454 if_attachdomain(); 455 splx(s); 456 457 #ifdef GPROF 458 /* Initialize kernel profiling. */ 459 kmstartup(); 460 #endif 461 462 /* Initialize system accouting. */ 463 acct_init(); 464 465 /* Kick off timeout driven events by calling first time. */ 466 schedcpu(NULL); 467 468 #ifdef KTRACE 469 /* Initialize ktrace. */ 470 ktrinit(); 471 #endif 472 473 /* 474 * Create process 1 (init(8)). We do this now, as Unix has 475 * historically had init be process 1, and changing this would 476 * probably upset a lot of people. 477 * 478 * Note that process 1 won't immediately exec init(8), but will 479 * wait for us to inform it that the root file system has been 480 * mounted. 481 */ 482 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 483 panic("fork init"); 484 485 /* 486 * Create any kernel threads who's creation was deferred because 487 * initproc had not yet been created. 488 */ 489 kthread_run_deferred_queue(); 490 491 /* 492 * Now that device driver threads have been created, wait for 493 * them to finish any deferred autoconfiguration. Note we don't 494 * need to lock this semaphore, since we haven't booted any 495 * secondary processors, yet. 496 */ 497 while (config_pending) 498 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 499 500 /* 501 * Finalize configuration now that all real devices have been 502 * found. This needs to be done before the root device is 503 * selected, since finalization may create the root device. 504 */ 505 config_finalize(); 506 507 /* 508 * Now that autoconfiguration has completed, we can determine 509 * the root and dump devices. 510 */ 511 cpu_rootconf(); 512 cpu_dumpconf(); 513 514 /* Mount the root file system. */ 515 do { 516 domountroothook(); 517 if ((error = vfs_mountroot())) { 518 printf("cannot mount root, error = %d\n", error); 519 boothowto |= RB_ASKNAME; 520 setroot(root_device, 521 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 522 } 523 } while (error != 0); 524 mountroothook_destroy(); 525 526 /* 527 * Initialise the time-of-day clock, passing the time recorded 528 * in the root filesystem (if any) for use by systems that 529 * don't have a non-volatile time-of-day device. 530 */ 531 inittodr(rootfstime); 532 533 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 534 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 535 536 /* 537 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 538 * reference it. 539 */ 540 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 541 if (error) 542 panic("cannot find root vnode, error=%d", error); 543 cwdi0.cwdi_cdir = rootvnode; 544 VREF(cwdi0.cwdi_cdir); 545 VOP_UNLOCK(rootvnode, 0); 546 cwdi0.cwdi_rdir = NULL; 547 548 /* 549 * Now that root is mounted, we can fixup initproc's CWD 550 * info. All other processes are kthreads, which merely 551 * share proc0's CWD info. 552 */ 553 initproc->p_cwdi->cwdi_cdir = rootvnode; 554 VREF(initproc->p_cwdi->cwdi_cdir); 555 initproc->p_cwdi->cwdi_rdir = NULL; 556 557 /* 558 * Now can look at time, having had a chance to verify the time 559 * from the file system. Reset l->l_rtime as it may have been 560 * munched in mi_switch() after the time got set. 561 */ 562 #ifdef __HAVE_TIMECOUNTER 563 getmicrotime(&time); 564 #else 565 mono_time = time; 566 #endif 567 boottime = time; 568 rw_enter(&proclist_lock, RW_READER); 569 LIST_FOREACH(p, &allproc, p_list) { 570 KASSERT((p->p_flag & PK_MARKER) == 0); 571 mutex_enter(&p->p_smutex); 572 p->p_stats->p_start = time; 573 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 574 lwp_lock(l); 575 l->l_cpu->ci_schedstate.spc_runtime = time; 576 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 577 lwp_unlock(l); 578 } 579 mutex_exit(&p->p_smutex); 580 } 581 rw_exit(&proclist_lock); 582 583 /* Create the pageout daemon kernel thread. */ 584 uvm_swap_init(); 585 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 586 panic("fork pagedaemon"); 587 588 /* Create the filesystem syncer kernel thread. */ 589 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 590 panic("fork syncer"); 591 592 /* Create the aiodone daemon kernel thread. */ 593 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 594 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 595 panic("fork aiodoned"); 596 597 #if defined(MULTIPROCESSOR) 598 /* Boot the secondary processors. */ 599 cpu_boot_secondary_processors(); 600 601 /* Count the number of running CPUs. */ 602 for (CPU_INFO_FOREACH(cii, ci)) { 603 ncpu++; 604 } 605 ncpu--; 606 #endif 607 608 /* Initialize exec structures */ 609 exec_init(1); 610 611 /* 612 * Okay, now we can let init(8) exec! It's off to userland! 613 */ 614 start_init_exec = 1; 615 wakeup(&start_init_exec); 616 617 /* The scheduler is an infinite loop. */ 618 uvm_scheduler(); 619 /* NOTREACHED */ 620 } 621 622 void 623 setrootfstime(time_t t) 624 { 625 rootfstime = t; 626 } 627 628 static void 629 check_console(struct lwp *l) 630 { 631 struct nameidata nd; 632 int error; 633 634 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 635 error = namei(&nd); 636 if (error == 0) 637 vrele(nd.ni_vp); 638 else if (error == ENOENT) 639 printf("warning: no /dev/console\n"); 640 else 641 printf("warning: lookup /dev/console: error %d\n", error); 642 } 643 644 /* 645 * List of paths to try when searching for "init". 646 */ 647 static const char *initpaths[] = { 648 "/sbin/init", 649 "/sbin/oinit", 650 "/sbin/init.bak", 651 NULL, 652 }; 653 654 /* 655 * Start the initial user process; try exec'ing each pathname in "initpaths". 656 * The program is invoked with one argument containing the boot flags. 657 */ 658 static void 659 start_init(void *arg) 660 { 661 struct lwp *l = arg; 662 struct proc *p = l->l_proc; 663 vaddr_t addr; 664 struct sys_execve_args /* { 665 syscallarg(const char *) path; 666 syscallarg(char * const *) argp; 667 syscallarg(char * const *) envp; 668 } */ args; 669 int options, i, error; 670 register_t retval[2]; 671 char flags[4], *flagsp; 672 const char *path, *slash; 673 char *ucp, **uap, *arg0, *arg1 = NULL; 674 char ipath[129]; 675 int ipx, len; 676 677 /* 678 * Now in process 1. 679 */ 680 strncpy(p->p_comm, "init", MAXCOMLEN); 681 682 /* 683 * Wait for main() to tell us that it's safe to exec. 684 */ 685 while (start_init_exec == 0) 686 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 687 688 /* 689 * This is not the right way to do this. We really should 690 * hand-craft a descriptor onto /dev/console to hand to init, 691 * but that's a _lot_ more work, and the benefit from this easy 692 * hack makes up for the "good is the enemy of the best" effect. 693 */ 694 check_console(l); 695 696 /* 697 * Need just enough stack to hold the faked-up "execve()" arguments. 698 */ 699 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 700 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 701 NULL, UVM_UNKNOWN_OFFSET, 0, 702 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 703 UVM_ADV_NORMAL, 704 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 705 panic("init: couldn't allocate argument space"); 706 p->p_vmspace->vm_maxsaddr = (caddr_t)STACK_MAX(addr, PAGE_SIZE); 707 708 ipx = 0; 709 while (1) { 710 if (boothowto & RB_ASKNAME) { 711 printf("init path"); 712 if (initpaths[ipx]) 713 printf(" (default %s)", initpaths[ipx]); 714 printf(": "); 715 len = cngetsn(ipath, sizeof(ipath)-1); 716 if (len == 0) { 717 if (initpaths[ipx]) 718 path = initpaths[ipx++]; 719 else 720 continue; 721 } else { 722 ipath[len] = '\0'; 723 path = ipath; 724 } 725 } else { 726 if ((path = initpaths[ipx++]) == NULL) 727 break; 728 } 729 730 ucp = (char *)USRSTACK; 731 732 /* 733 * Construct the boot flag argument. 734 */ 735 flagsp = flags; 736 *flagsp++ = '-'; 737 options = 0; 738 739 if (boothowto & RB_SINGLE) { 740 *flagsp++ = 's'; 741 options = 1; 742 } 743 #ifdef notyet 744 if (boothowto & RB_FASTBOOT) { 745 *flagsp++ = 'f'; 746 options = 1; 747 } 748 #endif 749 750 /* 751 * Move out the flags (arg 1), if necessary. 752 */ 753 if (options != 0) { 754 *flagsp++ = '\0'; 755 i = flagsp - flags; 756 #ifdef DEBUG 757 printf("init: copying out flags `%s' %d\n", flags, i); 758 #endif 759 arg1 = STACK_ALLOC(ucp, i); 760 ucp = STACK_MAX(arg1, i); 761 (void)copyout((caddr_t)flags, arg1, i); 762 } 763 764 /* 765 * Move out the file name (also arg 0). 766 */ 767 i = strlen(path) + 1; 768 #ifdef DEBUG 769 printf("init: copying out path `%s' %d\n", path, i); 770 #else 771 if (boothowto & RB_ASKNAME || path != initpaths[0]) 772 printf("init: trying %s\n", path); 773 #endif 774 arg0 = STACK_ALLOC(ucp, i); 775 ucp = STACK_MAX(arg0, i); 776 (void)copyout(path, arg0, i); 777 778 /* 779 * Move out the arg pointers. 780 */ 781 ucp = (caddr_t)STACK_ALIGN(ucp, ALIGNBYTES); 782 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 783 SCARG(&args, path) = arg0; 784 SCARG(&args, argp) = uap; 785 SCARG(&args, envp) = NULL; 786 slash = strrchr(path, '/'); 787 if (slash) 788 (void)suword((caddr_t)uap++, 789 (long)arg0 + (slash + 1 - path)); 790 else 791 (void)suword((caddr_t)uap++, (long)arg0); 792 if (options != 0) 793 (void)suword((caddr_t)uap++, (long)arg1); 794 (void)suword((caddr_t)uap++, 0); /* terminator */ 795 796 /* 797 * Now try to exec the program. If can't for any reason 798 * other than it doesn't exist, complain. 799 */ 800 error = sys_execve(l, &args, retval); 801 if (error == 0 || error == EJUSTRETURN) { 802 KERNEL_UNLOCK_LAST(l); 803 return; 804 } 805 printf("exec %s: error %d\n", path, error); 806 } 807 printf("init: not found\n"); 808 panic("no init"); 809 } 810
Indexes created Sun Sep 21 20:09:37 GMT 2025