init_main.c revision 1.304
1 /* $NetBSD: init_main.c,v 1.304 2007/06/17 13:34:43 yamt 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 1.304 2007/06/17 13:34:43 yamt 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/cpu.h> 99 #include <sys/kernel.h> 100 #include <sys/kcont.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/reboot.h> 119 #include <sys/user.h> 120 #include <sys/sysctl.h> 121 #include <sys/event.h> 122 #include <sys/mbuf.h> 123 #include <sys/sched.h> 124 #include <sys/sleepq.h> 125 #include <sys/iostat.h> 126 #include <sys/vmem.h> 127 #ifdef FAST_IPSEC 128 #include <netipsec/ipsec.h> 129 #endif 130 #ifdef SYSVSHM 131 #include <sys/shm.h> 132 #endif 133 #ifdef SYSVSEM 134 #include <sys/sem.h> 135 #endif 136 #ifdef SYSVMSG 137 #include <sys/msg.h> 138 #endif 139 #ifdef SYSTRACE 140 #include <sys/systrace.h> 141 #endif 142 #ifdef P1003_1B_SEMAPHORE 143 #include <sys/ksem.h> 144 #endif 145 #include <sys/domain.h> 146 #include <sys/namei.h> 147 #if NRND > 0 148 #include <sys/rnd.h> 149 #endif 150 #include <sys/pipe.h> 151 #ifdef LKM 152 #include <sys/lkm.h> 153 #endif 154 #if NVERIEXEC > 0 155 #include <sys/verified_exec.h> 156 #endif /* NVERIEXEC > 0 */ 157 #ifdef KTRACE 158 #include <sys/ktrace.h> 159 #endif 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 = 0; /* 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 #ifdef NVNODE_IMPLICIT 245 int usevnodes; 246 #endif 247 248 /* 249 * Initialize the current LWP pointer (curlwp) before 250 * any possible traps/probes to simplify trap processing. 251 */ 252 l = &lwp0; 253 curlwp = l; 254 l->l_cpu = curcpu(); 255 l->l_proc = &proc0; 256 l->l_lid = 1; 257 258 /* 259 * Attempt to find console and initialize 260 * in case of early panic or other messages. 261 */ 262 consinit(); 263 264 KERNEL_LOCK_INIT(); 265 266 uvm_init(); 267 268 #ifdef DEBUG 269 debug_init(); 270 #endif 271 272 kmem_init(); 273 274 /* Do machine-dependent initialization. */ 275 cpu_startup(); 276 277 /* Initialize callouts. */ 278 callout_startup(); 279 280 /* 281 * Initialize the kernel authorization subsystem and start the 282 * default security model, if any. We need to do this early 283 * enough so that subsystems relying on any of the aforementioned 284 * can work properly. Since the security model may dictate the 285 * credential inheritance policy, it is needed at least before 286 * any process is created, specifically proc0. 287 */ 288 kauth_init(); 289 secmodel_start(); 290 291 /* Initialize the buffer cache */ 292 bufinit(); 293 294 /* 295 * Initialize mbuf's. Do this now because we might attempt to 296 * allocate mbufs or mbuf clusters during autoconfiguration. 297 */ 298 mbinit(); 299 300 /* Initialize sockets. */ 301 soinit(); 302 303 #ifdef KCONT 304 /* Initialize kcont. */ 305 kcont_init(); 306 #endif 307 308 /* 309 * The following things must be done before autoconfiguration. 310 */ 311 evcnt_init(); /* initialize event counters */ 312 #if NRND > 0 313 rnd_init(); /* initialize RNG */ 314 #endif 315 316 /* Initialize process and pgrp structures. */ 317 procinit(); 318 lwpinit(); 319 320 /* Initialize signal-related data structures. */ 321 signal_init(); 322 323 /* Create process 0 (the swapper). */ 324 proc0_init(); 325 326 /* 327 * Charge root for one process. 328 */ 329 (void)chgproccnt(0, 1); 330 331 /* Initialize the run queues, turnstiles and sleep queues. */ 332 sched_rqinit(); 333 turnstile_init(); 334 sleeptab_init(&sleeptab); 335 336 /* MI initialization of the boot cpu */ 337 error = mi_cpu_attach(curcpu()); 338 KASSERT(error == 0); 339 340 /* Initialize the sysctl subsystem. */ 341 sysctl_init(); 342 343 /* Initialize I/O statistics. */ 344 iostat_init(); 345 346 /* Initialize the file systems. */ 347 #ifdef NVNODE_IMPLICIT 348 /* 349 * If maximum number of vnodes in namei vnode cache is not explicitly 350 * defined in kernel config, adjust the number such as we use roughly 351 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 352 */ 353 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 354 if (usevnodes > desiredvnodes) 355 desiredvnodes = usevnodes; 356 #endif 357 vfsinit(); 358 359 /* Initialize fstrans. */ 360 fstrans_init(); 361 362 /* Initialize asynchronous I/O. */ 363 aio_sysinit(); 364 365 #ifdef __HAVE_TIMECOUNTER 366 inittimecounter(); 367 ntp_init(); 368 #endif /* __HAVE_TIMECOUNTER */ 369 370 /* Configure the system hardware. This will enable interrupts. */ 371 configure(); 372 373 #if defined(__SSP__) || defined(__SSP_ALL__) 374 { 375 #ifdef DIAGNOSTIC 376 printf("Initializing SSP:"); 377 #endif 378 /* 379 * We initialize ssp here carefully: 380 * 1. after we got some entropy 381 * 2. without calling a function 382 */ 383 size_t i; 384 long guard[__arraycount(__stack_chk_guard)]; 385 386 arc4randbytes(guard, sizeof(guard)); 387 for (i = 0; i < __arraycount(guard); i++) 388 __stack_chk_guard[i] = guard[i]; 389 #ifdef DIAGNOSTIC 390 for (i = 0; i < __arraycount(guard); i++) 391 printf("%lx ", guard[i]); 392 printf("\n"); 393 #endif 394 } 395 #endif 396 ubc_init(); /* must be after autoconfig */ 397 398 /* Lock the kernel on behalf of proc0. */ 399 KERNEL_LOCK(1, l); 400 401 #ifdef SYSTRACE 402 systrace_init(); 403 #endif 404 405 #ifdef SYSVSHM 406 /* Initialize System V style shared memory. */ 407 shminit(); 408 #endif 409 410 #ifdef SYSVSEM 411 /* Initialize System V style semaphores. */ 412 seminit(); 413 #endif 414 415 #ifdef SYSVMSG 416 /* Initialize System V style message queues. */ 417 msginit(); 418 #endif 419 420 #ifdef P1003_1B_SEMAPHORE 421 /* Initialize posix semaphores */ 422 ksem_init(); 423 #endif 424 425 #if NVERIEXEC > 0 426 /* 427 * Initialise the Veriexec subsystem. 428 */ 429 veriexec_init(); 430 #endif /* NVERIEXEC > 0 */ 431 432 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 433 pax_init(); 434 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 435 436 /* Attach pseudo-devices. */ 437 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 438 (*pdev->pdev_attach)(pdev->pdev_count); 439 440 #ifdef FAST_IPSEC 441 /* Attach network crypto subsystem */ 442 ipsec_attach(); 443 #endif 444 445 /* 446 * Initialize protocols. Block reception of incoming packets 447 * until everything is ready. 448 */ 449 s = splnet(); 450 ifinit(); 451 domaininit(); 452 if_attachdomain(); 453 splx(s); 454 455 #ifdef GPROF 456 /* Initialize kernel profiling. */ 457 kmstartup(); 458 #endif 459 460 /* Initialize system accouting. */ 461 acct_init(); 462 463 #ifndef PIPE_SOCKETPAIR 464 /* Initialize pipes. */ 465 pipe_init(); 466 #endif 467 468 /* Setup the scheduler */ 469 sched_setup(); 470 471 #ifdef KTRACE 472 /* Initialize ktrace. */ 473 ktrinit(); 474 #endif 475 476 /* 477 * Create process 1 (init(8)). We do this now, as Unix has 478 * historically had init be process 1, and changing this would 479 * probably upset a lot of people. 480 * 481 * Note that process 1 won't immediately exec init(8), but will 482 * wait for us to inform it that the root file system has been 483 * mounted. 484 */ 485 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 486 panic("fork init"); 487 488 /* 489 * Create any kernel threads who's creation was deferred because 490 * initproc had not yet been created. 491 */ 492 kthread_run_deferred_queue(); 493 494 /* 495 * Now that device driver threads have been created, wait for 496 * them to finish any deferred autoconfiguration. Note we don't 497 * need to lock this semaphore, since we haven't booted any 498 * secondary processors, yet. 499 */ 500 while (config_pending) 501 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 502 503 /* 504 * Finalize configuration now that all real devices have been 505 * found. This needs to be done before the root device is 506 * selected, since finalization may create the root device. 507 */ 508 config_finalize(); 509 510 /* 511 * Now that autoconfiguration has completed, we can determine 512 * the root and dump devices. 513 */ 514 cpu_rootconf(); 515 cpu_dumpconf(); 516 517 /* Mount the root file system. */ 518 do { 519 domountroothook(); 520 if ((error = vfs_mountroot())) { 521 printf("cannot mount root, error = %d\n", error); 522 boothowto |= RB_ASKNAME; 523 setroot(root_device, 524 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 525 } 526 } while (error != 0); 527 mountroothook_destroy(); 528 529 /* 530 * Initialise the time-of-day clock, passing the time recorded 531 * in the root filesystem (if any) for use by systems that 532 * don't have a non-volatile time-of-day device. 533 */ 534 inittodr(rootfstime); 535 536 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 537 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 538 539 /* 540 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 541 * reference it. 542 */ 543 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 544 if (error) 545 panic("cannot find root vnode, error=%d", error); 546 cwdi0.cwdi_cdir = rootvnode; 547 VREF(cwdi0.cwdi_cdir); 548 VOP_UNLOCK(rootvnode, 0); 549 cwdi0.cwdi_rdir = NULL; 550 551 /* 552 * Now that root is mounted, we can fixup initproc's CWD 553 * info. All other processes are kthreads, which merely 554 * share proc0's CWD info. 555 */ 556 initproc->p_cwdi->cwdi_cdir = rootvnode; 557 VREF(initproc->p_cwdi->cwdi_cdir); 558 initproc->p_cwdi->cwdi_rdir = NULL; 559 560 /* 561 * Now can look at time, having had a chance to verify the time 562 * from the file system. Reset l->l_rtime as it may have been 563 * munched in mi_switch() after the time got set. 564 */ 565 #ifdef __HAVE_TIMECOUNTER 566 getmicrotime(&time); 567 #else 568 mono_time = time; 569 #endif 570 boottime = time; 571 mutex_enter(&proclist_lock); 572 LIST_FOREACH(p, &allproc, p_list) { 573 KASSERT((p->p_flag & PK_MARKER) == 0); 574 mutex_enter(&p->p_smutex); 575 p->p_stats->p_start = time; 576 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 577 lwp_lock(l); 578 l->l_cpu->ci_schedstate.spc_runtime = time; 579 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 580 lwp_unlock(l); 581 } 582 mutex_exit(&p->p_smutex); 583 } 584 mutex_exit(&proclist_lock); 585 586 /* Create the pageout daemon kernel thread. */ 587 uvm_swap_init(); 588 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 589 panic("fork pagedaemon"); 590 591 /* Create the filesystem syncer kernel thread. */ 592 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 593 panic("fork syncer"); 594 595 /* Create the aiodone daemon kernel thread. */ 596 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 597 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 598 panic("fork aiodoned"); 599 600 vmem_rehash_start(); 601 602 #if defined(MULTIPROCESSOR) 603 /* Boot the secondary processors. */ 604 cpu_boot_secondary_processors(); 605 #endif 606 607 /* Initialize exec structures */ 608 exec_init(1); 609 610 /* 611 * Okay, now we can let init(8) exec! It's off to userland! 612 */ 613 start_init_exec = 1; 614 wakeup(&start_init_exec); 615 616 /* The scheduler is an infinite loop. */ 617 uvm_scheduler(); 618 /* NOTREACHED */ 619 } 620 621 void 622 setrootfstime(time_t t) 623 { 624 rootfstime = t; 625 } 626 627 static void 628 check_console(struct lwp *l) 629 { 630 struct nameidata nd; 631 int error; 632 633 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 634 error = namei(&nd); 635 if (error == 0) 636 vrele(nd.ni_vp); 637 else if (error == ENOENT) 638 printf("warning: no /dev/console\n"); 639 else 640 printf("warning: lookup /dev/console: error %d\n", error); 641 } 642 643 /* 644 * List of paths to try when searching for "init". 645 */ 646 static const char *initpaths[] = { 647 "/sbin/init", 648 "/sbin/oinit", 649 "/sbin/init.bak", 650 NULL, 651 }; 652 653 /* 654 * Start the initial user process; try exec'ing each pathname in "initpaths". 655 * The program is invoked with one argument containing the boot flags. 656 */ 657 static void 658 start_init(void *arg) 659 { 660 struct lwp *l = arg; 661 struct proc *p = l->l_proc; 662 vaddr_t addr; 663 struct sys_execve_args /* { 664 syscallarg(const char *) path; 665 syscallarg(char * const *) argp; 666 syscallarg(char * const *) envp; 667 } */ args; 668 int options, i, error; 669 register_t retval[2]; 670 char flags[4], *flagsp; 671 const char *path, *slash; 672 char *ucp, **uap, *arg0, *arg1 = NULL; 673 char ipath[129]; 674 int ipx, len; 675 676 /* 677 * Now in process 1. 678 */ 679 strncpy(p->p_comm, "init", MAXCOMLEN); 680 681 /* 682 * Wait for main() to tell us that it's safe to exec. 683 */ 684 while (start_init_exec == 0) 685 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 686 687 /* 688 * This is not the right way to do this. We really should 689 * hand-craft a descriptor onto /dev/console to hand to init, 690 * but that's a _lot_ more work, and the benefit from this easy 691 * hack makes up for the "good is the enemy of the best" effect. 692 */ 693 check_console(l); 694 695 /* 696 * Need just enough stack to hold the faked-up "execve()" arguments. 697 */ 698 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 699 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 700 NULL, UVM_UNKNOWN_OFFSET, 0, 701 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 702 UVM_ADV_NORMAL, 703 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 704 panic("init: couldn't allocate argument space"); 705 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 706 707 ipx = 0; 708 while (1) { 709 if (boothowto & RB_ASKNAME) { 710 printf("init path"); 711 if (initpaths[ipx]) 712 printf(" (default %s)", initpaths[ipx]); 713 printf(": "); 714 len = cngetsn(ipath, sizeof(ipath)-1); 715 if (len == 0) { 716 if (initpaths[ipx]) 717 path = initpaths[ipx++]; 718 else 719 continue; 720 } else { 721 ipath[len] = '\0'; 722 path = ipath; 723 } 724 } else { 725 if ((path = initpaths[ipx++]) == NULL) 726 break; 727 } 728 729 ucp = (char *)USRSTACK; 730 731 /* 732 * Construct the boot flag argument. 733 */ 734 flagsp = flags; 735 *flagsp++ = '-'; 736 options = 0; 737 738 if (boothowto & RB_SINGLE) { 739 *flagsp++ = 's'; 740 options = 1; 741 } 742 #ifdef notyet 743 if (boothowto & RB_FASTBOOT) { 744 *flagsp++ = 'f'; 745 options = 1; 746 } 747 #endif 748 749 /* 750 * Move out the flags (arg 1), if necessary. 751 */ 752 if (options != 0) { 753 *flagsp++ = '\0'; 754 i = flagsp - flags; 755 #ifdef DEBUG 756 printf("init: copying out flags `%s' %d\n", flags, i); 757 #endif 758 arg1 = STACK_ALLOC(ucp, i); 759 ucp = STACK_MAX(arg1, i); 760 (void)copyout((void *)flags, arg1, i); 761 } 762 763 /* 764 * Move out the file name (also arg 0). 765 */ 766 i = strlen(path) + 1; 767 #ifdef DEBUG 768 printf("init: copying out path `%s' %d\n", path, i); 769 #else 770 if (boothowto & RB_ASKNAME || path != initpaths[0]) 771 printf("init: trying %s\n", path); 772 #endif 773 arg0 = STACK_ALLOC(ucp, i); 774 ucp = STACK_MAX(arg0, i); 775 (void)copyout(path, arg0, i); 776 777 /* 778 * Move out the arg pointers. 779 */ 780 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 781 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 782 SCARG(&args, path) = arg0; 783 SCARG(&args, argp) = uap; 784 SCARG(&args, envp) = NULL; 785 slash = strrchr(path, '/'); 786 if (slash) 787 (void)suword((void *)uap++, 788 (long)arg0 + (slash + 1 - path)); 789 else 790 (void)suword((void *)uap++, (long)arg0); 791 if (options != 0) 792 (void)suword((void *)uap++, (long)arg1); 793 (void)suword((void *)uap++, 0); /* terminator */ 794 795 /* 796 * Now try to exec the program. If can't for any reason 797 * other than it doesn't exist, complain. 798 */ 799 error = sys_execve(l, &args, retval); 800 if (error == 0 || error == EJUSTRETURN) { 801 KERNEL_UNLOCK_LAST(l); 802 return; 803 } 804 printf("exec %s: error %d\n", path, error); 805 } 806 printf("init: not found\n"); 807 panic("no init"); 808 } 809
Indexes created Sun Sep 21 15:09:59 GMT 2025