init_main.c revision 1.301
1 /* $NetBSD: init_main.c,v 1.301 2007/03/13 17:23:49 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 1.301 2007/03/13 17:23:49 ad 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 #include <sys/pipe.h> 148 #ifdef LKM 149 #include <sys/lkm.h> 150 #endif 151 #if NVERIEXEC > 0 152 #include <sys/verified_exec.h> 153 #endif /* NVERIEXEC > 0 */ 154 #ifdef KTRACE 155 #include <sys/ktrace.h> 156 #endif 157 #include <sys/debug.h> 158 #include <sys/kauth.h> 159 #include <net80211/ieee80211_netbsd.h> 160 161 #include <sys/syscall.h> 162 #include <sys/syscallargs.h> 163 164 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 165 #include <sys/pax.h> 166 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 167 #include <ufs/ufs/quota.h> 168 169 #include <miscfs/genfs/genfs.h> 170 #include <miscfs/syncfs/syncfs.h> 171 172 #include <machine/cpu.h> 173 174 #include <uvm/uvm.h> 175 176 #include <dev/cons.h> 177 178 #include <net/if.h> 179 #include <net/raw_cb.h> 180 181 #include <secmodel/secmodel.h> 182 183 extern struct proc proc0; 184 extern struct lwp lwp0; 185 extern struct cwdinfo cwdi0; 186 187 #ifndef curlwp 188 struct lwp *curlwp = &lwp0; 189 #endif 190 struct proc *initproc; 191 192 struct vnode *rootvp, *swapdev_vp; 193 int boothowto; 194 int cold = 1; /* still working on startup */ 195 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 196 time_t rootfstime; /* recorded root fs time, if known */ 197 int ncpu = 1; /* number of CPUs configured, assume 1 */ 198 199 volatile int start_init_exec; /* semaphore for start_init() */ 200 201 static void check_console(struct lwp *l); 202 static void start_init(void *); 203 void main(void); 204 205 #if defined(__SSP__) || defined(__SSP_ALL__) 206 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 207 void __stack_chk_fail(void); 208 209 void 210 __stack_chk_fail(void) 211 { 212 panic("stack overflow detected; terminated"); 213 } 214 #endif 215 216 void __secmodel_none(void); 217 __weak_alias(secmodel_start,__secmodel_none); 218 void 219 __secmodel_none(void) 220 { 221 return; 222 } 223 224 /* 225 * System startup; initialize the world, create process 0, mount root 226 * filesystem, and fork to create init and pagedaemon. Most of the 227 * hard work is done in the lower-level initialization routines including 228 * startup(), which does memory initialization and autoconfiguration. 229 */ 230 void 231 main(void) 232 { 233 #ifdef __HAVE_TIMECOUNTER 234 struct timeval time; 235 #endif 236 struct lwp *l; 237 struct proc *p; 238 struct pdevinit *pdev; 239 int s, error; 240 extern struct pdevinit pdevinit[]; 241 extern void schedcpu(void *); 242 #ifdef NVNODE_IMPLICIT 243 int usevnodes; 244 #endif 245 #ifdef MULTIPROCESSOR 246 CPU_INFO_ITERATOR cii; 247 struct cpu_info *ci; 248 #endif 249 250 /* 251 * Initialize the current LWP pointer (curlwp) before 252 * any possible traps/probes to simplify trap processing. 253 */ 254 l = &lwp0; 255 curlwp = l; 256 l->l_cpu = curcpu(); 257 l->l_proc = &proc0; 258 l->l_lid = 1; 259 260 /* 261 * Attempt to find console and initialize 262 * in case of early panic or other messages. 263 */ 264 consinit(); 265 266 KERNEL_LOCK_INIT(); 267 268 uvm_init(); 269 270 #ifdef DEBUG 271 debug_init(); 272 #endif 273 274 kmem_init(); 275 276 /* Do machine-dependent initialization. */ 277 cpu_startup(); 278 279 /* Initialize callouts. */ 280 callout_startup(); 281 282 /* 283 * Initialize the kernel authorization subsystem and start the 284 * default security model, if any. We need to do this early 285 * enough so that subsystems relying on any of the aforementioned 286 * can work properly. Since the security model may dictate the 287 * credential inheritance policy, it is needed at least before 288 * any process is created, specifically proc0. 289 */ 290 kauth_init(); 291 secmodel_start(); 292 293 /* Initialize the buffer cache */ 294 bufinit(); 295 296 /* 297 * Initialize mbuf's. Do this now because we might attempt to 298 * allocate mbufs or mbuf clusters during autoconfiguration. 299 */ 300 mbinit(); 301 302 /* Initialize sockets. */ 303 soinit(); 304 305 #ifdef KCONT 306 /* Initialize kcont. */ 307 kcont_init(); 308 #endif 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 /* Create process 0 (the swapper). */ 326 proc0_init(); 327 328 /* 329 * Charge root for one process. 330 */ 331 (void)chgproccnt(0, 1); 332 333 /* Initialize the run queues, turnstiles and sleep queues. */ 334 rqinit(); 335 turnstile_init(); 336 sleeptab_init(&sleeptab); 337 338 /* Initialize the sysctl subsystem. */ 339 sysctl_init(); 340 341 /* Initialize I/O statistics. */ 342 iostat_init(); 343 344 /* Initialize the file systems. */ 345 #ifdef NVNODE_IMPLICIT 346 /* 347 * If maximum number of vnodes in namei vnode cache is not explicitly 348 * defined in kernel config, adjust the number such as we use roughly 349 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 350 */ 351 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 352 if (usevnodes > desiredvnodes) 353 desiredvnodes = usevnodes; 354 #endif 355 vfsinit(); 356 357 /* Initialize fstrans. */ 358 fstrans_init(); 359 360 #ifdef __HAVE_TIMECOUNTER 361 inittimecounter(); 362 ntp_init(); 363 #endif /* __HAVE_TIMECOUNTER */ 364 365 /* Configure the system hardware. This will enable interrupts. */ 366 configure(); 367 368 #if defined(__SSP__) || defined(__SSP_ALL__) 369 { 370 #ifdef DIAGNOSTIC 371 printf("Initializing SSP:"); 372 #endif 373 /* 374 * We initialize ssp here carefully: 375 * 1. after we got some entropy 376 * 2. without calling a function 377 */ 378 size_t i; 379 long guard[__arraycount(__stack_chk_guard)]; 380 381 arc4randbytes(guard, sizeof(guard)); 382 for (i = 0; i < __arraycount(guard); i++) 383 __stack_chk_guard[i] = guard[i]; 384 #ifdef DIAGNOSTIC 385 for (i = 0; i < __arraycount(guard); i++) 386 printf("%lx ", guard[i]); 387 printf("\n"); 388 #endif 389 } 390 #endif 391 ubc_init(); /* must be after autoconfig */ 392 393 /* Lock the kernel on behalf of proc0. */ 394 KERNEL_LOCK(1, l); 395 396 #ifdef SYSTRACE 397 systrace_init(); 398 #endif 399 400 #ifdef SYSVSHM 401 /* Initialize System V style shared memory. */ 402 shminit(); 403 #endif 404 405 #ifdef SYSVSEM 406 /* Initialize System V style semaphores. */ 407 seminit(); 408 #endif 409 410 #ifdef SYSVMSG 411 /* Initialize System V style message queues. */ 412 msginit(); 413 #endif 414 415 #ifdef P1003_1B_SEMAPHORE 416 /* Initialize posix semaphores */ 417 ksem_init(); 418 #endif 419 420 #if NVERIEXEC > 0 421 /* 422 * Initialise the Veriexec subsystem. 423 */ 424 veriexec_init(); 425 #endif /* NVERIEXEC > 0 */ 426 427 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 428 pax_init(); 429 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 430 431 /* Attach pseudo-devices. */ 432 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 433 (*pdev->pdev_attach)(pdev->pdev_count); 434 435 #ifdef FAST_IPSEC 436 /* Attach network crypto subsystem */ 437 ipsec_attach(); 438 #endif 439 440 /* 441 * Initialize protocols. Block reception of incoming packets 442 * until everything is ready. 443 */ 444 s = splnet(); 445 ifinit(); 446 domaininit(); 447 if_attachdomain(); 448 splx(s); 449 450 #ifdef GPROF 451 /* Initialize kernel profiling. */ 452 kmstartup(); 453 #endif 454 455 /* Initialize system accouting. */ 456 acct_init(); 457 458 #ifndef PIPE_SOCKETPAIR 459 /* Initialize pipes. */ 460 pipe_init(); 461 #endif 462 463 /* Kick off timeout driven events by calling first time. */ 464 schedcpu(NULL); 465 466 #ifdef KTRACE 467 /* Initialize ktrace. */ 468 ktrinit(); 469 #endif 470 471 /* 472 * Create process 1 (init(8)). We do this now, as Unix has 473 * historically had init be process 1, and changing this would 474 * probably upset a lot of people. 475 * 476 * Note that process 1 won't immediately exec init(8), but will 477 * wait for us to inform it that the root file system has been 478 * mounted. 479 */ 480 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 481 panic("fork init"); 482 483 /* 484 * Create any kernel threads who's creation was deferred because 485 * initproc had not yet been created. 486 */ 487 kthread_run_deferred_queue(); 488 489 /* 490 * Now that device driver threads have been created, wait for 491 * them to finish any deferred autoconfiguration. Note we don't 492 * need to lock this semaphore, since we haven't booted any 493 * secondary processors, yet. 494 */ 495 while (config_pending) 496 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 497 498 /* 499 * Finalize configuration now that all real devices have been 500 * found. This needs to be done before the root device is 501 * selected, since finalization may create the root device. 502 */ 503 config_finalize(); 504 505 /* 506 * Now that autoconfiguration has completed, we can determine 507 * the root and dump devices. 508 */ 509 cpu_rootconf(); 510 cpu_dumpconf(); 511 512 /* Mount the root file system. */ 513 do { 514 domountroothook(); 515 if ((error = vfs_mountroot())) { 516 printf("cannot mount root, error = %d\n", error); 517 boothowto |= RB_ASKNAME; 518 setroot(root_device, 519 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 520 } 521 } while (error != 0); 522 mountroothook_destroy(); 523 524 /* 525 * Initialise the time-of-day clock, passing the time recorded 526 * in the root filesystem (if any) for use by systems that 527 * don't have a non-volatile time-of-day device. 528 */ 529 inittodr(rootfstime); 530 531 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 532 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 533 534 /* 535 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 536 * reference it. 537 */ 538 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 539 if (error) 540 panic("cannot find root vnode, error=%d", error); 541 cwdi0.cwdi_cdir = rootvnode; 542 VREF(cwdi0.cwdi_cdir); 543 VOP_UNLOCK(rootvnode, 0); 544 cwdi0.cwdi_rdir = NULL; 545 546 /* 547 * Now that root is mounted, we can fixup initproc's CWD 548 * info. All other processes are kthreads, which merely 549 * share proc0's CWD info. 550 */ 551 initproc->p_cwdi->cwdi_cdir = rootvnode; 552 VREF(initproc->p_cwdi->cwdi_cdir); 553 initproc->p_cwdi->cwdi_rdir = NULL; 554 555 /* 556 * Now can look at time, having had a chance to verify the time 557 * from the file system. Reset l->l_rtime as it may have been 558 * munched in mi_switch() after the time got set. 559 */ 560 #ifdef __HAVE_TIMECOUNTER 561 getmicrotime(&time); 562 #else 563 mono_time = time; 564 #endif 565 boottime = time; 566 mutex_enter(&proclist_lock); 567 LIST_FOREACH(p, &allproc, p_list) { 568 KASSERT((p->p_flag & PK_MARKER) == 0); 569 mutex_enter(&p->p_smutex); 570 p->p_stats->p_start = time; 571 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 572 lwp_lock(l); 573 l->l_cpu->ci_schedstate.spc_runtime = time; 574 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 575 lwp_unlock(l); 576 } 577 mutex_exit(&p->p_smutex); 578 } 579 mutex_exit(&proclist_lock); 580 581 /* Create the pageout daemon kernel thread. */ 582 uvm_swap_init(); 583 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 584 panic("fork pagedaemon"); 585 586 /* Create the filesystem syncer kernel thread. */ 587 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 588 panic("fork syncer"); 589 590 /* Create the aiodone daemon kernel thread. */ 591 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 592 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 593 panic("fork aiodoned"); 594 595 #if defined(MULTIPROCESSOR) 596 /* Boot the secondary processors. */ 597 cpu_boot_secondary_processors(); 598 599 /* Count the number of running CPUs. */ 600 for (CPU_INFO_FOREACH(cii, ci)) { 601 ncpu++; 602 } 603 ncpu--; 604 #endif 605 606 /* Initialize exec structures */ 607 exec_init(1); 608 609 /* 610 * Okay, now we can let init(8) exec! It's off to userland! 611 */ 612 start_init_exec = 1; 613 wakeup(&start_init_exec); 614 615 /* The scheduler is an infinite loop. */ 616 uvm_scheduler(); 617 /* NOTREACHED */ 618 } 619 620 void 621 setrootfstime(time_t t) 622 { 623 rootfstime = t; 624 } 625 626 static void 627 check_console(struct lwp *l) 628 { 629 struct nameidata nd; 630 int error; 631 632 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 633 error = namei(&nd); 634 if (error == 0) 635 vrele(nd.ni_vp); 636 else if (error == ENOENT) 637 printf("warning: no /dev/console\n"); 638 else 639 printf("warning: lookup /dev/console: error %d\n", error); 640 } 641 642 /* 643 * List of paths to try when searching for "init". 644 */ 645 static const char *initpaths[] = { 646 "/sbin/init", 647 "/sbin/oinit", 648 "/sbin/init.bak", 649 NULL, 650 }; 651 652 /* 653 * Start the initial user process; try exec'ing each pathname in "initpaths". 654 * The program is invoked with one argument containing the boot flags. 655 */ 656 static void 657 start_init(void *arg) 658 { 659 struct lwp *l = arg; 660 struct proc *p = l->l_proc; 661 vaddr_t addr; 662 struct sys_execve_args /* { 663 syscallarg(const char *) path; 664 syscallarg(char * const *) argp; 665 syscallarg(char * const *) envp; 666 } */ args; 667 int options, i, error; 668 register_t retval[2]; 669 char flags[4], *flagsp; 670 const char *path, *slash; 671 char *ucp, **uap, *arg0, *arg1 = NULL; 672 char ipath[129]; 673 int ipx, len; 674 675 /* 676 * Now in process 1. 677 */ 678 strncpy(p->p_comm, "init", MAXCOMLEN); 679 680 /* 681 * Wait for main() to tell us that it's safe to exec. 682 */ 683 while (start_init_exec == 0) 684 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 685 686 /* 687 * This is not the right way to do this. We really should 688 * hand-craft a descriptor onto /dev/console to hand to init, 689 * but that's a _lot_ more work, and the benefit from this easy 690 * hack makes up for the "good is the enemy of the best" effect. 691 */ 692 check_console(l); 693 694 /* 695 * Need just enough stack to hold the faked-up "execve()" arguments. 696 */ 697 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 698 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 699 NULL, UVM_UNKNOWN_OFFSET, 0, 700 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 701 UVM_ADV_NORMAL, 702 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 703 panic("init: couldn't allocate argument space"); 704 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 705 706 ipx = 0; 707 while (1) { 708 if (boothowto & RB_ASKNAME) { 709 printf("init path"); 710 if (initpaths[ipx]) 711 printf(" (default %s)", initpaths[ipx]); 712 printf(": "); 713 len = cngetsn(ipath, sizeof(ipath)-1); 714 if (len == 0) { 715 if (initpaths[ipx]) 716 path = initpaths[ipx++]; 717 else 718 continue; 719 } else { 720 ipath[len] = '\0'; 721 path = ipath; 722 } 723 } else { 724 if ((path = initpaths[ipx++]) == NULL) 725 break; 726 } 727 728 ucp = (char *)USRSTACK; 729 730 /* 731 * Construct the boot flag argument. 732 */ 733 flagsp = flags; 734 *flagsp++ = '-'; 735 options = 0; 736 737 if (boothowto & RB_SINGLE) { 738 *flagsp++ = 's'; 739 options = 1; 740 } 741 #ifdef notyet 742 if (boothowto & RB_FASTBOOT) { 743 *flagsp++ = 'f'; 744 options = 1; 745 } 746 #endif 747 748 /* 749 * Move out the flags (arg 1), if necessary. 750 */ 751 if (options != 0) { 752 *flagsp++ = '\0'; 753 i = flagsp - flags; 754 #ifdef DEBUG 755 printf("init: copying out flags `%s' %d\n", flags, i); 756 #endif 757 arg1 = STACK_ALLOC(ucp, i); 758 ucp = STACK_MAX(arg1, i); 759 (void)copyout((void *)flags, arg1, i); 760 } 761 762 /* 763 * Move out the file name (also arg 0). 764 */ 765 i = strlen(path) + 1; 766 #ifdef DEBUG 767 printf("init: copying out path `%s' %d\n", path, i); 768 #else 769 if (boothowto & RB_ASKNAME || path != initpaths[0]) 770 printf("init: trying %s\n", path); 771 #endif 772 arg0 = STACK_ALLOC(ucp, i); 773 ucp = STACK_MAX(arg0, i); 774 (void)copyout(path, arg0, i); 775 776 /* 777 * Move out the arg pointers. 778 */ 779 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 780 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 781 SCARG(&args, path) = arg0; 782 SCARG(&args, argp) = uap; 783 SCARG(&args, envp) = NULL; 784 slash = strrchr(path, '/'); 785 if (slash) 786 (void)suword((void *)uap++, 787 (long)arg0 + (slash + 1 - path)); 788 else 789 (void)suword((void *)uap++, (long)arg0); 790 if (options != 0) 791 (void)suword((void *)uap++, (long)arg1); 792 (void)suword((void *)uap++, 0); /* terminator */ 793 794 /* 795 * Now try to exec the program. If can't for any reason 796 * other than it doesn't exist, complain. 797 */ 798 error = sys_execve(l, &args, retval); 799 if (error == 0 || error == EJUSTRETURN) { 800 KERNEL_UNLOCK_LAST(l); 801 return; 802 } 803 printf("exec %s: error %d\n", path, error); 804 } 805 printf("init: not found\n"); 806 panic("no init"); 807 } 808
Indexes created Wed Sep 24 05:09:52 GMT 2025