init_main.c revision 1.305
1 /* $NetBSD: init_main.c,v 1.305 2007/07/01 07:36:39 xtraeme 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 1.305 2007/07/01 07:36:39 xtraeme 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 "sysmon_envsys.h" 91 #include "sysmon_power.h" 92 #include "veriexec.h" 93 94 #include <sys/param.h> 95 #include <sys/acct.h> 96 #include <sys/filedesc.h> 97 #include <sys/file.h> 98 #include <sys/errno.h> 99 #include <sys/callout.h> 100 #include <sys/cpu.h> 101 #include <sys/kernel.h> 102 #include <sys/kcont.h> 103 #include <sys/kmem.h> 104 #include <sys/mount.h> 105 #include <sys/proc.h> 106 #include <sys/kthread.h> 107 #include <sys/resourcevar.h> 108 #include <sys/signalvar.h> 109 #include <sys/systm.h> 110 #include <sys/vnode.h> 111 #include <sys/fstrans.h> 112 #include <sys/tty.h> 113 #include <sys/conf.h> 114 #include <sys/disklabel.h> 115 #include <sys/buf.h> 116 #include <sys/device.h> 117 #include <sys/exec.h> 118 #include <sys/socketvar.h> 119 #include <sys/protosw.h> 120 #include <sys/reboot.h> 121 #include <sys/user.h> 122 #include <sys/sysctl.h> 123 #include <sys/event.h> 124 #include <sys/mbuf.h> 125 #include <sys/sched.h> 126 #include <sys/sleepq.h> 127 #include <sys/iostat.h> 128 #include <sys/vmem.h> 129 #ifdef FAST_IPSEC 130 #include <netipsec/ipsec.h> 131 #endif 132 #ifdef SYSVSHM 133 #include <sys/shm.h> 134 #endif 135 #ifdef SYSVSEM 136 #include <sys/sem.h> 137 #endif 138 #ifdef SYSVMSG 139 #include <sys/msg.h> 140 #endif 141 #ifdef SYSTRACE 142 #include <sys/systrace.h> 143 #endif 144 #ifdef P1003_1B_SEMAPHORE 145 #include <sys/ksem.h> 146 #endif 147 #include <sys/domain.h> 148 #include <sys/namei.h> 149 #if NRND > 0 150 #include <sys/rnd.h> 151 #endif 152 #include <sys/pipe.h> 153 #ifdef LKM 154 #include <sys/lkm.h> 155 #endif 156 #if NVERIEXEC > 0 157 #include <sys/verified_exec.h> 158 #endif /* NVERIEXEC > 0 */ 159 #ifdef KTRACE 160 #include <sys/ktrace.h> 161 #endif 162 #include <sys/debug.h> 163 #include <sys/kauth.h> 164 #include <net80211/ieee80211_netbsd.h> 165 166 #include <sys/syscall.h> 167 #include <sys/syscallargs.h> 168 169 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 170 #include <sys/pax.h> 171 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 172 #include <ufs/ufs/quota.h> 173 174 #include <miscfs/genfs/genfs.h> 175 #include <miscfs/syncfs/syncfs.h> 176 177 #include <machine/cpu.h> 178 179 #include <uvm/uvm.h> 180 181 #include <dev/cons.h> 182 #if NSYSMON_ENVSYS > 0 || NSYSMON_POWER > 0 183 #include <dev/sysmon/sysmonvar.h> 184 #endif 185 186 #include <net/if.h> 187 #include <net/raw_cb.h> 188 189 #include <secmodel/secmodel.h> 190 191 extern struct proc proc0; 192 extern struct lwp lwp0; 193 extern struct cwdinfo cwdi0; 194 195 #ifndef curlwp 196 struct lwp *curlwp = &lwp0; 197 #endif 198 struct proc *initproc; 199 200 struct vnode *rootvp, *swapdev_vp; 201 int boothowto; 202 int cold = 1; /* still working on startup */ 203 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 204 time_t rootfstime; /* recorded root fs time, if known */ 205 int ncpu = 0; /* number of CPUs configured, assume 1 */ 206 207 volatile int start_init_exec; /* semaphore for start_init() */ 208 209 static void check_console(struct lwp *l); 210 static void start_init(void *); 211 void main(void); 212 213 #if defined(__SSP__) || defined(__SSP_ALL__) 214 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 215 void __stack_chk_fail(void); 216 217 void 218 __stack_chk_fail(void) 219 { 220 panic("stack overflow detected; terminated"); 221 } 222 #endif 223 224 void __secmodel_none(void); 225 __weak_alias(secmodel_start,__secmodel_none); 226 void 227 __secmodel_none(void) 228 { 229 return; 230 } 231 232 /* 233 * System startup; initialize the world, create process 0, mount root 234 * filesystem, and fork to create init and pagedaemon. Most of the 235 * hard work is done in the lower-level initialization routines including 236 * startup(), which does memory initialization and autoconfiguration. 237 */ 238 void 239 main(void) 240 { 241 #ifdef __HAVE_TIMECOUNTER 242 struct timeval time; 243 #endif 244 struct lwp *l; 245 struct proc *p; 246 struct pdevinit *pdev; 247 int s, error; 248 extern struct pdevinit pdevinit[]; 249 #ifdef NVNODE_IMPLICIT 250 int usevnodes; 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 /* 264 * Attempt to find console and initialize 265 * in case of early panic or other messages. 266 */ 267 consinit(); 268 269 KERNEL_LOCK_INIT(); 270 271 uvm_init(); 272 273 #ifdef DEBUG 274 debug_init(); 275 #endif 276 277 kmem_init(); 278 279 /* Do machine-dependent initialization. */ 280 cpu_startup(); 281 282 /* Initialize callouts. */ 283 callout_startup(); 284 285 /* 286 * Initialize the kernel authorization subsystem and start the 287 * default security model, if any. We need to do this early 288 * enough so that subsystems relying on any of the aforementioned 289 * can work properly. Since the security model may dictate the 290 * credential inheritance policy, it is needed at least before 291 * any process is created, specifically proc0. 292 */ 293 kauth_init(); 294 secmodel_start(); 295 296 /* Initialize the buffer cache */ 297 bufinit(); 298 299 /* 300 * Initialize mbuf's. Do this now because we might attempt to 301 * allocate mbufs or mbuf clusters during autoconfiguration. 302 */ 303 mbinit(); 304 305 /* Initialize sockets. */ 306 soinit(); 307 308 #ifdef KCONT 309 /* Initialize kcont. */ 310 kcont_init(); 311 #endif 312 313 /* 314 * The following things must be done before autoconfiguration. 315 */ 316 evcnt_init(); /* initialize event counters */ 317 #if NRND > 0 318 rnd_init(); /* initialize RNG */ 319 #endif 320 321 /* Initialize process and pgrp structures. */ 322 procinit(); 323 lwpinit(); 324 325 /* Initialize signal-related data structures. */ 326 signal_init(); 327 328 /* Create process 0 (the swapper). */ 329 proc0_init(); 330 331 /* 332 * Charge root for one process. 333 */ 334 (void)chgproccnt(0, 1); 335 336 /* Initialize the run queues, turnstiles and sleep queues. */ 337 sched_rqinit(); 338 turnstile_init(); 339 sleeptab_init(&sleeptab); 340 341 /* MI initialization of the boot cpu */ 342 error = mi_cpu_attach(curcpu()); 343 KASSERT(error == 0); 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 /* Initialize asynchronous I/O. */ 368 aio_sysinit(); 369 370 #if NSYSMON_ENVSYS > 0 371 sysmon_envsys_init(); 372 #endif 373 #if NSYSMON_POWER > 0 374 sysmon_power_init(); 375 #endif 376 #ifdef __HAVE_TIMECOUNTER 377 inittimecounter(); 378 ntp_init(); 379 #endif /* __HAVE_TIMECOUNTER */ 380 381 /* Configure the system hardware. This will enable interrupts. */ 382 configure(); 383 384 #if defined(__SSP__) || defined(__SSP_ALL__) 385 { 386 #ifdef DIAGNOSTIC 387 printf("Initializing SSP:"); 388 #endif 389 /* 390 * We initialize ssp here carefully: 391 * 1. after we got some entropy 392 * 2. without calling a function 393 */ 394 size_t i; 395 long guard[__arraycount(__stack_chk_guard)]; 396 397 arc4randbytes(guard, sizeof(guard)); 398 for (i = 0; i < __arraycount(guard); i++) 399 __stack_chk_guard[i] = guard[i]; 400 #ifdef DIAGNOSTIC 401 for (i = 0; i < __arraycount(guard); i++) 402 printf("%lx ", guard[i]); 403 printf("\n"); 404 #endif 405 } 406 #endif 407 ubc_init(); /* must be after autoconfig */ 408 409 /* Lock the kernel on behalf of proc0. */ 410 KERNEL_LOCK(1, l); 411 412 #ifdef SYSTRACE 413 systrace_init(); 414 #endif 415 416 #ifdef SYSVSHM 417 /* Initialize System V style shared memory. */ 418 shminit(); 419 #endif 420 421 #ifdef SYSVSEM 422 /* Initialize System V style semaphores. */ 423 seminit(); 424 #endif 425 426 #ifdef SYSVMSG 427 /* Initialize System V style message queues. */ 428 msginit(); 429 #endif 430 431 #ifdef P1003_1B_SEMAPHORE 432 /* Initialize posix semaphores */ 433 ksem_init(); 434 #endif 435 436 #if NVERIEXEC > 0 437 /* 438 * Initialise the Veriexec subsystem. 439 */ 440 veriexec_init(); 441 #endif /* NVERIEXEC > 0 */ 442 443 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 444 pax_init(); 445 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 446 447 /* Attach pseudo-devices. */ 448 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 449 (*pdev->pdev_attach)(pdev->pdev_count); 450 451 #ifdef FAST_IPSEC 452 /* Attach network crypto subsystem */ 453 ipsec_attach(); 454 #endif 455 456 /* 457 * Initialize protocols. Block reception of incoming packets 458 * until everything is ready. 459 */ 460 s = splnet(); 461 ifinit(); 462 domaininit(); 463 if_attachdomain(); 464 splx(s); 465 466 #ifdef GPROF 467 /* Initialize kernel profiling. */ 468 kmstartup(); 469 #endif 470 471 /* Initialize system accouting. */ 472 acct_init(); 473 474 #ifndef PIPE_SOCKETPAIR 475 /* Initialize pipes. */ 476 pipe_init(); 477 #endif 478 479 /* Setup the scheduler */ 480 sched_setup(); 481 482 #ifdef KTRACE 483 /* Initialize ktrace. */ 484 ktrinit(); 485 #endif 486 487 /* 488 * Create process 1 (init(8)). We do this now, as Unix has 489 * historically had init be process 1, and changing this would 490 * probably upset a lot of people. 491 * 492 * Note that process 1 won't immediately exec init(8), but will 493 * wait for us to inform it that the root file system has been 494 * mounted. 495 */ 496 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 497 panic("fork init"); 498 499 /* 500 * Create any kernel threads who's creation was deferred because 501 * initproc had not yet been created. 502 */ 503 kthread_run_deferred_queue(); 504 505 /* 506 * Now that device driver threads have been created, wait for 507 * them to finish any deferred autoconfiguration. Note we don't 508 * need to lock this semaphore, since we haven't booted any 509 * secondary processors, yet. 510 */ 511 while (config_pending) 512 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 513 514 /* 515 * Finalize configuration now that all real devices have been 516 * found. This needs to be done before the root device is 517 * selected, since finalization may create the root device. 518 */ 519 config_finalize(); 520 521 /* 522 * Now that autoconfiguration has completed, we can determine 523 * the root and dump devices. 524 */ 525 cpu_rootconf(); 526 cpu_dumpconf(); 527 528 /* Mount the root file system. */ 529 do { 530 domountroothook(); 531 if ((error = vfs_mountroot())) { 532 printf("cannot mount root, error = %d\n", error); 533 boothowto |= RB_ASKNAME; 534 setroot(root_device, 535 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 536 } 537 } while (error != 0); 538 mountroothook_destroy(); 539 540 /* 541 * Initialise the time-of-day clock, passing the time recorded 542 * in the root filesystem (if any) for use by systems that 543 * don't have a non-volatile time-of-day device. 544 */ 545 inittodr(rootfstime); 546 547 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 548 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 549 550 /* 551 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 552 * reference it. 553 */ 554 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 555 if (error) 556 panic("cannot find root vnode, error=%d", error); 557 cwdi0.cwdi_cdir = rootvnode; 558 VREF(cwdi0.cwdi_cdir); 559 VOP_UNLOCK(rootvnode, 0); 560 cwdi0.cwdi_rdir = NULL; 561 562 /* 563 * Now that root is mounted, we can fixup initproc's CWD 564 * info. All other processes are kthreads, which merely 565 * share proc0's CWD info. 566 */ 567 initproc->p_cwdi->cwdi_cdir = rootvnode; 568 VREF(initproc->p_cwdi->cwdi_cdir); 569 initproc->p_cwdi->cwdi_rdir = NULL; 570 571 /* 572 * Now can look at time, having had a chance to verify the time 573 * from the file system. Reset l->l_rtime as it may have been 574 * munched in mi_switch() after the time got set. 575 */ 576 #ifdef __HAVE_TIMECOUNTER 577 getmicrotime(&time); 578 #else 579 mono_time = time; 580 #endif 581 boottime = time; 582 mutex_enter(&proclist_lock); 583 LIST_FOREACH(p, &allproc, p_list) { 584 KASSERT((p->p_flag & PK_MARKER) == 0); 585 mutex_enter(&p->p_smutex); 586 p->p_stats->p_start = time; 587 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 588 lwp_lock(l); 589 l->l_cpu->ci_schedstate.spc_runtime = time; 590 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 591 lwp_unlock(l); 592 } 593 mutex_exit(&p->p_smutex); 594 } 595 mutex_exit(&proclist_lock); 596 597 /* Create the pageout daemon kernel thread. */ 598 uvm_swap_init(); 599 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 600 panic("fork pagedaemon"); 601 602 /* Create the filesystem syncer kernel thread. */ 603 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 604 panic("fork syncer"); 605 606 /* Create the aiodone daemon kernel thread. */ 607 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 608 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 609 panic("fork aiodoned"); 610 611 vmem_rehash_start(); 612 613 #if defined(MULTIPROCESSOR) 614 /* Boot the secondary processors. */ 615 cpu_boot_secondary_processors(); 616 #endif 617 618 /* Initialize exec structures */ 619 exec_init(1); 620 621 /* 622 * Okay, now we can let init(8) exec! It's off to userland! 623 */ 624 start_init_exec = 1; 625 wakeup(&start_init_exec); 626 627 /* The scheduler is an infinite loop. */ 628 uvm_scheduler(); 629 /* NOTREACHED */ 630 } 631 632 void 633 setrootfstime(time_t t) 634 { 635 rootfstime = t; 636 } 637 638 static void 639 check_console(struct lwp *l) 640 { 641 struct nameidata nd; 642 int error; 643 644 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 645 error = namei(&nd); 646 if (error == 0) 647 vrele(nd.ni_vp); 648 else if (error == ENOENT) 649 printf("warning: no /dev/console\n"); 650 else 651 printf("warning: lookup /dev/console: error %d\n", error); 652 } 653 654 /* 655 * List of paths to try when searching for "init". 656 */ 657 static const char *initpaths[] = { 658 "/sbin/init", 659 "/sbin/oinit", 660 "/sbin/init.bak", 661 NULL, 662 }; 663 664 /* 665 * Start the initial user process; try exec'ing each pathname in "initpaths". 666 * The program is invoked with one argument containing the boot flags. 667 */ 668 static void 669 start_init(void *arg) 670 { 671 struct lwp *l = arg; 672 struct proc *p = l->l_proc; 673 vaddr_t addr; 674 struct sys_execve_args /* { 675 syscallarg(const char *) path; 676 syscallarg(char * const *) argp; 677 syscallarg(char * const *) envp; 678 } */ args; 679 int options, i, error; 680 register_t retval[2]; 681 char flags[4], *flagsp; 682 const char *path, *slash; 683 char *ucp, **uap, *arg0, *arg1 = NULL; 684 char ipath[129]; 685 int ipx, len; 686 687 /* 688 * Now in process 1. 689 */ 690 strncpy(p->p_comm, "init", MAXCOMLEN); 691 692 /* 693 * Wait for main() to tell us that it's safe to exec. 694 */ 695 while (start_init_exec == 0) 696 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 697 698 /* 699 * This is not the right way to do this. We really should 700 * hand-craft a descriptor onto /dev/console to hand to init, 701 * but that's a _lot_ more work, and the benefit from this easy 702 * hack makes up for the "good is the enemy of the best" effect. 703 */ 704 check_console(l); 705 706 /* 707 * Need just enough stack to hold the faked-up "execve()" arguments. 708 */ 709 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 710 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 711 NULL, UVM_UNKNOWN_OFFSET, 0, 712 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 713 UVM_ADV_NORMAL, 714 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 715 panic("init: couldn't allocate argument space"); 716 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 717 718 ipx = 0; 719 while (1) { 720 if (boothowto & RB_ASKNAME) { 721 printf("init path"); 722 if (initpaths[ipx]) 723 printf(" (default %s)", initpaths[ipx]); 724 printf(": "); 725 len = cngetsn(ipath, sizeof(ipath)-1); 726 if (len == 0) { 727 if (initpaths[ipx]) 728 path = initpaths[ipx++]; 729 else 730 continue; 731 } else { 732 ipath[len] = '\0'; 733 path = ipath; 734 } 735 } else { 736 if ((path = initpaths[ipx++]) == NULL) 737 break; 738 } 739 740 ucp = (char *)USRSTACK; 741 742 /* 743 * Construct the boot flag argument. 744 */ 745 flagsp = flags; 746 *flagsp++ = '-'; 747 options = 0; 748 749 if (boothowto & RB_SINGLE) { 750 *flagsp++ = 's'; 751 options = 1; 752 } 753 #ifdef notyet 754 if (boothowto & RB_FASTBOOT) { 755 *flagsp++ = 'f'; 756 options = 1; 757 } 758 #endif 759 760 /* 761 * Move out the flags (arg 1), if necessary. 762 */ 763 if (options != 0) { 764 *flagsp++ = '\0'; 765 i = flagsp - flags; 766 #ifdef DEBUG 767 printf("init: copying out flags `%s' %d\n", flags, i); 768 #endif 769 arg1 = STACK_ALLOC(ucp, i); 770 ucp = STACK_MAX(arg1, i); 771 (void)copyout((void *)flags, arg1, i); 772 } 773 774 /* 775 * Move out the file name (also arg 0). 776 */ 777 i = strlen(path) + 1; 778 #ifdef DEBUG 779 printf("init: copying out path `%s' %d\n", path, i); 780 #else 781 if (boothowto & RB_ASKNAME || path != initpaths[0]) 782 printf("init: trying %s\n", path); 783 #endif 784 arg0 = STACK_ALLOC(ucp, i); 785 ucp = STACK_MAX(arg0, i); 786 (void)copyout(path, arg0, i); 787 788 /* 789 * Move out the arg pointers. 790 */ 791 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 792 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 793 SCARG(&args, path) = arg0; 794 SCARG(&args, argp) = uap; 795 SCARG(&args, envp) = NULL; 796 slash = strrchr(path, '/'); 797 if (slash) 798 (void)suword((void *)uap++, 799 (long)arg0 + (slash + 1 - path)); 800 else 801 (void)suword((void *)uap++, (long)arg0); 802 if (options != 0) 803 (void)suword((void *)uap++, (long)arg1); 804 (void)suword((void *)uap++, 0); /* terminator */ 805 806 /* 807 * Now try to exec the program. If can't for any reason 808 * other than it doesn't exist, complain. 809 */ 810 error = sys_execve(l, &args, retval); 811 if (error == 0 || error == EJUSTRETURN) { 812 KERNEL_UNLOCK_LAST(l); 813 return; 814 } 815 printf("exec %s: error %d\n", path, error); 816 } 817 printf("init: not found\n"); 818 panic("no init"); 819 } 820
Indexes created Mon Sep 22 13:09:51 GMT 2025