init_main.c revision 1.311
1 /* $NetBSD: init_main.c,v 1.311 2007/07/30 08:45:26 pooka 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 1.311 2007/07/30 08:45:26 pooka Exp $"); 75 76 #include "opt_ipsec.h" 77 #include "opt_multiprocessor.h" 78 #include "opt_ntp.h" 79 #include "opt_pipe.h" 80 #include "opt_posix.h" 81 #include "opt_syscall_debug.h" 82 #include "opt_sysv.h" 83 #include "opt_systrace.h" 84 #include "opt_fileassoc.h" 85 #include "opt_ktrace.h" 86 #include "opt_pax.h" 87 88 #include "sysmon_taskq.h" 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/kmem.h> 103 #include <sys/mount.h> 104 #include <sys/proc.h> 105 #include <sys/kthread.h> 106 #include <sys/resourcevar.h> 107 #include <sys/signalvar.h> 108 #include <sys/systm.h> 109 #include <sys/vnode.h> 110 #include <sys/fstrans.h> 111 #include <sys/tty.h> 112 #include <sys/conf.h> 113 #include <sys/disklabel.h> 114 #include <sys/buf.h> 115 #include <sys/device.h> 116 #include <sys/exec.h> 117 #include <sys/socketvar.h> 118 #include <sys/protosw.h> 119 #include <sys/reboot.h> 120 #include <sys/user.h> 121 #include <sys/sysctl.h> 122 #include <sys/event.h> 123 #include <sys/mbuf.h> 124 #include <sys/sched.h> 125 #include <sys/sleepq.h> 126 #include <sys/iostat.h> 127 #include <sys/vmem.h> 128 #include <sys/uuid.h> 129 #include <sys/extent.h> 130 #include <sys/disk.h> 131 #ifdef FAST_IPSEC 132 #include <netipsec/ipsec.h> 133 #endif 134 #ifdef SYSVSHM 135 #include <sys/shm.h> 136 #endif 137 #ifdef SYSVSEM 138 #include <sys/sem.h> 139 #endif 140 #ifdef SYSVMSG 141 #include <sys/msg.h> 142 #endif 143 #ifdef SYSTRACE 144 #include <sys/systrace.h> 145 #endif 146 #ifdef P1003_1B_SEMAPHORE 147 #include <sys/ksem.h> 148 #endif 149 #include <sys/domain.h> 150 #include <sys/namei.h> 151 #if NRND > 0 152 #include <sys/rnd.h> 153 #endif 154 #include <sys/pipe.h> 155 #ifdef LKM 156 #include <sys/lkm.h> 157 #endif 158 #if NVERIEXEC > 0 159 #include <sys/verified_exec.h> 160 #endif /* NVERIEXEC > 0 */ 161 #ifdef KTRACE 162 #include <sys/ktrace.h> 163 #endif 164 #include <sys/debug.h> 165 #include <sys/kauth.h> 166 #include <net80211/ieee80211_netbsd.h> 167 168 #include <sys/syscall.h> 169 #include <sys/syscallargs.h> 170 171 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 172 #include <sys/pax.h> 173 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 174 #include <ufs/ufs/quota.h> 175 176 #include <miscfs/genfs/genfs.h> 177 #include <miscfs/syncfs/syncfs.h> 178 179 #include <machine/cpu.h> 180 181 #include <uvm/uvm.h> 182 183 #if NSYSMON_TASKQ > 0 184 #include <dev/sysmon/sysmon_taskq.h> 185 #endif 186 187 #include <dev/cons.h> 188 189 #if NSYSMON_ENVSYS > 0 || NSYSMON_POWER > 0 190 #include <dev/sysmon/sysmonvar.h> 191 #endif 192 193 #include <net/if.h> 194 #include <net/raw_cb.h> 195 196 #include <secmodel/secmodel.h> 197 198 extern struct proc proc0; 199 extern struct lwp lwp0; 200 extern struct cwdinfo cwdi0; 201 extern time_t rootfstime; 202 203 #ifndef curlwp 204 struct lwp *curlwp = &lwp0; 205 #endif 206 struct proc *initproc; 207 208 struct vnode *rootvp, *swapdev_vp; 209 int boothowto; 210 int cold = 1; /* still working on startup */ 211 struct timeval boottime; /* time at system startup - will only follow settime deltas */ 212 int ncpu = 0; /* number of CPUs configured, assume 1 */ 213 214 volatile int start_init_exec; /* semaphore for start_init() */ 215 216 static void check_console(struct lwp *l); 217 static void start_init(void *); 218 void main(void); 219 220 #if defined(__SSP__) || defined(__SSP_ALL__) 221 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0}; 222 void __stack_chk_fail(void); 223 224 void 225 __stack_chk_fail(void) 226 { 227 panic("stack overflow detected; terminated"); 228 } 229 #endif 230 231 void __secmodel_none(void); 232 __weak_alias(secmodel_start,__secmodel_none); 233 void 234 __secmodel_none(void) 235 { 236 return; 237 } 238 239 /* 240 * System startup; initialize the world, create process 0, mount root 241 * filesystem, and fork to create init and pagedaemon. Most of the 242 * hard work is done in the lower-level initialization routines including 243 * startup(), which does memory initialization and autoconfiguration. 244 */ 245 void 246 main(void) 247 { 248 #ifdef __HAVE_TIMECOUNTER 249 struct timeval time; 250 #endif 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 259 260 /* 261 * Initialize the current LWP pointer (curlwp) before 262 * any possible traps/probes to simplify trap processing. 263 */ 264 l = &lwp0; 265 curlwp = l; 266 l->l_cpu = curcpu(); 267 l->l_proc = &proc0; 268 l->l_lid = 1; 269 270 /* 271 * Attempt to find console and initialize 272 * in case of early panic or other messages. 273 */ 274 consinit(); 275 276 KERNEL_LOCK_INIT(); 277 278 uvm_init(); 279 280 #ifdef DEBUG 281 debug_init(); 282 #endif 283 284 kmem_init(); 285 286 /* Initialize the extent manager. */ 287 extent_init(); 288 289 /* Do machine-dependent initialization. */ 290 cpu_startup(); 291 292 /* Initialize callouts, part 1. */ 293 callout_startup(); 294 295 /* 296 * Initialize the kernel authorization subsystem and start the 297 * default security model, if any. We need to do this early 298 * enough so that subsystems relying on any of the aforementioned 299 * can work properly. Since the security model may dictate the 300 * credential inheritance policy, it is needed at least before 301 * any process is created, specifically proc0. 302 */ 303 kauth_init(); 304 secmodel_start(); 305 306 /* Initialize the buffer cache */ 307 bufinit(); 308 309 /* 310 * Initialize mbuf's. Do this now because we might attempt to 311 * allocate mbufs or mbuf clusters during autoconfiguration. 312 */ 313 mbinit(); 314 315 /* Initialize sockets. */ 316 soinit(); 317 318 /* 319 * The following things must be done before autoconfiguration. 320 */ 321 evcnt_init(); /* initialize event counters */ 322 #if NRND > 0 323 rnd_init(); /* initialize RNG */ 324 #endif 325 326 /* Initialize process and pgrp structures. */ 327 procinit(); 328 lwpinit(); 329 330 /* Initialize signal-related data structures. */ 331 signal_init(); 332 333 /* Create process 0 (the swapper). */ 334 proc0_init(); 335 336 /* Initialize the UID hash table. */ 337 uid_init(); 338 339 /* Charge root for one process. */ 340 (void)chgproccnt(0, 1); 341 342 /* Initialize the run queues, turnstiles and sleep queues. */ 343 sched_rqinit(); 344 turnstile_init(); 345 sleeptab_init(&sleeptab); 346 347 /* MI initialization of the boot cpu */ 348 error = mi_cpu_attach(curcpu()); 349 KASSERT(error == 0); 350 351 /* Initialize the sysctl subsystem. */ 352 sysctl_init(); 353 354 /* Initialize I/O statistics. */ 355 iostat_init(); 356 357 /* Initialize the file systems. */ 358 #ifdef NVNODE_IMPLICIT 359 /* 360 * If maximum number of vnodes in namei vnode cache is not explicitly 361 * defined in kernel config, adjust the number such as we use roughly 362 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 363 */ 364 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 365 if (usevnodes > desiredvnodes) 366 desiredvnodes = usevnodes; 367 #endif 368 vfsinit(); 369 370 /* Initialize fstrans. */ 371 fstrans_init(); 372 373 /* Initialize the select()/poll() system calls. */ 374 selsysinit(); 375 376 /* Initialize asynchronous I/O. */ 377 aio_sysinit(); 378 379 #if NSYSMON_TASKQ > 0 380 sysmon_task_queue_preinit(); 381 #endif 382 383 #if NSYSMON_ENVSYS > 0 384 sysmon_envsys_init(); 385 #endif 386 387 #if NSYSMON_POWER > 0 388 sysmon_power_init(); 389 #endif 390 #ifdef __HAVE_TIMECOUNTER 391 inittimecounter(); 392 ntp_init(); 393 #endif /* __HAVE_TIMECOUNTER */ 394 395 /* Initialize the device switch tables. */ 396 devsw_init(); 397 398 /* Initialize the disk wedge subsystem. */ 399 dkwedge_init(); 400 401 /* Configure the system hardware. This will enable interrupts. */ 402 configure(); 403 404 #if defined(__SSP__) || defined(__SSP_ALL__) 405 { 406 #ifdef DIAGNOSTIC 407 printf("Initializing SSP:"); 408 #endif 409 /* 410 * We initialize ssp here carefully: 411 * 1. after we got some entropy 412 * 2. without calling a function 413 */ 414 size_t i; 415 long guard[__arraycount(__stack_chk_guard)]; 416 417 arc4randbytes(guard, sizeof(guard)); 418 for (i = 0; i < __arraycount(guard); i++) 419 __stack_chk_guard[i] = guard[i]; 420 #ifdef DIAGNOSTIC 421 for (i = 0; i < __arraycount(guard); i++) 422 printf("%lx ", guard[i]); 423 printf("\n"); 424 #endif 425 } 426 #endif 427 ubc_init(); /* must be after autoconfig */ 428 429 /* Lock the kernel on behalf of proc0. */ 430 KERNEL_LOCK(1, l); 431 432 #ifdef SYSTRACE 433 systrace_init(); 434 #endif 435 436 #ifdef SYSVSHM 437 /* Initialize System V style shared memory. */ 438 shminit(); 439 #endif 440 441 #ifdef SYSVSEM 442 /* Initialize System V style semaphores. */ 443 seminit(); 444 #endif 445 446 #ifdef SYSVMSG 447 /* Initialize System V style message queues. */ 448 msginit(); 449 #endif 450 451 #ifdef P1003_1B_SEMAPHORE 452 /* Initialize posix semaphores */ 453 ksem_init(); 454 #endif 455 456 #if NVERIEXEC > 0 457 /* 458 * Initialise the Veriexec subsystem. 459 */ 460 veriexec_init(); 461 #endif /* NVERIEXEC > 0 */ 462 463 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 464 pax_init(); 465 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 466 467 /* Attach pseudo-devices. */ 468 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 469 (*pdev->pdev_attach)(pdev->pdev_count); 470 471 #ifdef FAST_IPSEC 472 /* Attach network crypto subsystem */ 473 ipsec_attach(); 474 #endif 475 476 /* 477 * Initialize protocols. Block reception of incoming packets 478 * until everything is ready. 479 */ 480 s = splnet(); 481 ifinit(); 482 domaininit(); 483 if_attachdomain(); 484 splx(s); 485 486 #ifdef GPROF 487 /* Initialize kernel profiling. */ 488 kmstartup(); 489 #endif 490 491 /* Initialize system accouting. */ 492 acct_init(); 493 494 #ifndef PIPE_SOCKETPAIR 495 /* Initialize pipes. */ 496 pipe_init(); 497 #endif 498 499 /* Setup the scheduler */ 500 sched_init(); 501 502 #ifdef KTRACE 503 /* Initialize ktrace. */ 504 ktrinit(); 505 #endif 506 507 /* Initialize the UUID system calls. */ 508 uuid_init(); 509 510 /* 511 * Create process 1 (init(8)). We do this now, as Unix has 512 * historically had init be process 1, and changing this would 513 * probably upset a lot of people. 514 * 515 * Note that process 1 won't immediately exec init(8), but will 516 * wait for us to inform it that the root file system has been 517 * mounted. 518 */ 519 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 520 panic("fork init"); 521 522 /* 523 * Now that device driver threads have been created, wait for 524 * them to finish any deferred autoconfiguration. Note we don't 525 * need to lock this semaphore, since we haven't booted any 526 * secondary processors, yet. 527 */ 528 while (config_pending) 529 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 530 531 /* 532 * Finalize configuration now that all real devices have been 533 * found. This needs to be done before the root device is 534 * selected, since finalization may create the root device. 535 */ 536 config_finalize(); 537 538 /* 539 * Now that autoconfiguration has completed, we can determine 540 * the root and dump devices. 541 */ 542 cpu_rootconf(); 543 cpu_dumpconf(); 544 545 /* Mount the root file system. */ 546 do { 547 domountroothook(); 548 if ((error = vfs_mountroot())) { 549 printf("cannot mount root, error = %d\n", error); 550 boothowto |= RB_ASKNAME; 551 setroot(root_device, 552 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 553 } 554 } while (error != 0); 555 mountroothook_destroy(); 556 557 /* 558 * Initialise the time-of-day clock, passing the time recorded 559 * in the root filesystem (if any) for use by systems that 560 * don't have a non-volatile time-of-day device. 561 */ 562 inittodr(rootfstime); 563 564 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 565 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 566 567 /* 568 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 569 * reference it. 570 */ 571 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 572 if (error) 573 panic("cannot find root vnode, error=%d", error); 574 cwdi0.cwdi_cdir = rootvnode; 575 VREF(cwdi0.cwdi_cdir); 576 VOP_UNLOCK(rootvnode, 0); 577 cwdi0.cwdi_rdir = NULL; 578 579 /* 580 * Now that root is mounted, we can fixup initproc's CWD 581 * info. All other processes are kthreads, which merely 582 * share proc0's CWD info. 583 */ 584 initproc->p_cwdi->cwdi_cdir = rootvnode; 585 VREF(initproc->p_cwdi->cwdi_cdir); 586 initproc->p_cwdi->cwdi_rdir = NULL; 587 588 /* 589 * Now can look at time, having had a chance to verify the time 590 * from the file system. Reset l->l_rtime as it may have been 591 * munched in mi_switch() after the time got set. 592 */ 593 #ifdef __HAVE_TIMECOUNTER 594 getmicrotime(&time); 595 #else 596 mono_time = time; 597 #endif 598 boottime = time; 599 mutex_enter(&proclist_lock); 600 LIST_FOREACH(p, &allproc, p_list) { 601 KASSERT((p->p_flag & PK_MARKER) == 0); 602 mutex_enter(&p->p_smutex); 603 p->p_stats->p_start = time; 604 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 605 lwp_lock(l); 606 l->l_cpu->ci_schedstate.spc_runtime = time; 607 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 608 lwp_unlock(l); 609 } 610 mutex_exit(&p->p_smutex); 611 } 612 mutex_exit(&proclist_lock); 613 614 /* Create the pageout daemon kernel thread. */ 615 uvm_swap_init(); 616 if (kthread_create(PVM, 0, NULL, uvm_pageout, 617 NULL, NULL, "pgdaemon")) 618 panic("fork pagedaemon"); 619 620 /* Create the filesystem syncer kernel thread. */ 621 if (kthread_create(PINOD, 0, NULL, sched_sync, NULL, NULL, "ioflush")) 622 panic("fork syncer"); 623 624 /* Create the aiodone daemon kernel thread. */ 625 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 626 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 627 panic("fork aiodoned"); 628 629 vmem_rehash_start(); 630 631 #if defined(MULTIPROCESSOR) 632 /* Boot the secondary processors. */ 633 cpu_boot_secondary_processors(); 634 #endif 635 636 /* Initialize exec structures */ 637 exec_init(1); 638 639 /* 640 * Okay, now we can let init(8) exec! It's off to userland! 641 */ 642 start_init_exec = 1; 643 wakeup(&start_init_exec); 644 645 /* The scheduler is an infinite loop. */ 646 uvm_scheduler(); 647 /* NOTREACHED */ 648 } 649 650 static void 651 check_console(struct lwp *l) 652 { 653 struct nameidata nd; 654 int error; 655 656 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 657 error = namei(&nd); 658 if (error == 0) 659 vrele(nd.ni_vp); 660 else if (error == ENOENT) 661 printf("warning: no /dev/console\n"); 662 else 663 printf("warning: lookup /dev/console: error %d\n", error); 664 } 665 666 /* 667 * List of paths to try when searching for "init". 668 */ 669 static const char *initpaths[] = { 670 "/sbin/init", 671 "/sbin/oinit", 672 "/sbin/init.bak", 673 NULL, 674 }; 675 676 /* 677 * Start the initial user process; try exec'ing each pathname in "initpaths". 678 * The program is invoked with one argument containing the boot flags. 679 */ 680 static void 681 start_init(void *arg) 682 { 683 struct lwp *l = arg; 684 struct proc *p = l->l_proc; 685 vaddr_t addr; 686 struct sys_execve_args /* { 687 syscallarg(const char *) path; 688 syscallarg(char * const *) argp; 689 syscallarg(char * const *) envp; 690 } */ args; 691 int options, i, error; 692 register_t retval[2]; 693 char flags[4], *flagsp; 694 const char *path, *slash; 695 char *ucp, **uap, *arg0, *arg1 = NULL; 696 char ipath[129]; 697 int ipx, len; 698 699 /* 700 * Now in process 1. 701 */ 702 strncpy(p->p_comm, "init", MAXCOMLEN); 703 704 /* 705 * Wait for main() to tell us that it's safe to exec. 706 */ 707 while (start_init_exec == 0) 708 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 709 710 /* 711 * This is not the right way to do this. We really should 712 * hand-craft a descriptor onto /dev/console to hand to init, 713 * but that's a _lot_ more work, and the benefit from this easy 714 * hack makes up for the "good is the enemy of the best" effect. 715 */ 716 check_console(l); 717 718 /* 719 * Need just enough stack to hold the faked-up "execve()" arguments. 720 */ 721 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 722 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 723 NULL, UVM_UNKNOWN_OFFSET, 0, 724 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 725 UVM_ADV_NORMAL, 726 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 727 panic("init: couldn't allocate argument space"); 728 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 729 730 ipx = 0; 731 while (1) { 732 if (boothowto & RB_ASKNAME) { 733 printf("init path"); 734 if (initpaths[ipx]) 735 printf(" (default %s)", initpaths[ipx]); 736 printf(": "); 737 len = cngetsn(ipath, sizeof(ipath)-1); 738 if (len == 0) { 739 if (initpaths[ipx]) 740 path = initpaths[ipx++]; 741 else 742 continue; 743 } else { 744 ipath[len] = '\0'; 745 path = ipath; 746 } 747 } else { 748 if ((path = initpaths[ipx++]) == NULL) 749 break; 750 } 751 752 ucp = (char *)USRSTACK; 753 754 /* 755 * Construct the boot flag argument. 756 */ 757 flagsp = flags; 758 *flagsp++ = '-'; 759 options = 0; 760 761 if (boothowto & RB_SINGLE) { 762 *flagsp++ = 's'; 763 options = 1; 764 } 765 #ifdef notyet 766 if (boothowto & RB_FASTBOOT) { 767 *flagsp++ = 'f'; 768 options = 1; 769 } 770 #endif 771 772 /* 773 * Move out the flags (arg 1), if necessary. 774 */ 775 if (options != 0) { 776 *flagsp++ = '\0'; 777 i = flagsp - flags; 778 #ifdef DEBUG 779 printf("init: copying out flags `%s' %d\n", flags, i); 780 #endif 781 arg1 = STACK_ALLOC(ucp, i); 782 ucp = STACK_MAX(arg1, i); 783 (void)copyout((void *)flags, arg1, i); 784 } 785 786 /* 787 * Move out the file name (also arg 0). 788 */ 789 i = strlen(path) + 1; 790 #ifdef DEBUG 791 printf("init: copying out path `%s' %d\n", path, i); 792 #else 793 if (boothowto & RB_ASKNAME || path != initpaths[0]) 794 printf("init: trying %s\n", path); 795 #endif 796 arg0 = STACK_ALLOC(ucp, i); 797 ucp = STACK_MAX(arg0, i); 798 (void)copyout(path, arg0, i); 799 800 /* 801 * Move out the arg pointers. 802 */ 803 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 804 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 805 SCARG(&args, path) = arg0; 806 SCARG(&args, argp) = uap; 807 SCARG(&args, envp) = NULL; 808 slash = strrchr(path, '/'); 809 if (slash) 810 (void)suword((void *)uap++, 811 (long)arg0 + (slash + 1 - path)); 812 else 813 (void)suword((void *)uap++, (long)arg0); 814 if (options != 0) 815 (void)suword((void *)uap++, (long)arg1); 816 (void)suword((void *)uap++, 0); /* terminator */ 817 818 /* 819 * Now try to exec the program. If can't for any reason 820 * other than it doesn't exist, complain. 821 */ 822 error = sys_execve(l, &args, retval); 823 if (error == 0 || error == EJUSTRETURN) { 824 KERNEL_UNLOCK_LAST(l); 825 return; 826 } 827 printf("exec %s: error %d\n", path, error); 828 } 829 printf("init: not found\n"); 830 panic("no init"); 831 } 832
Indexes created Sat Sep 20 22:09:52 GMT 2025