init_main.c revision 1.307
1 /* $NetBSD: init_main.c,v 1.307 2007/07/09 21:10:50 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 1.307 2007/07/09 21:10:50 ad 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 "rnd.h" 89 #include "sysmon_envsys.h" 90 #include "sysmon_power.h" 91 #include "veriexec.h" 92 93 #include <sys/param.h> 94 #include <sys/acct.h> 95 #include <sys/filedesc.h> 96 #include <sys/file.h> 97 #include <sys/errno.h> 98 #include <sys/callout.h> 99 #include <sys/cpu.h> 100 #include <sys/kernel.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 #include <sys/uuid.h> 128 #include <sys/extent.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 /* Initialize the extent manager. */ 280 extent_init(); 281 282 /* Do machine-dependent initialization. */ 283 cpu_startup(); 284 285 /* Initialize callouts, part 1. */ 286 callout_startup(); 287 288 /* 289 * Initialize the kernel authorization subsystem and start the 290 * default security model, if any. We need to do this early 291 * enough so that subsystems relying on any of the aforementioned 292 * can work properly. Since the security model may dictate the 293 * credential inheritance policy, it is needed at least before 294 * any process is created, specifically proc0. 295 */ 296 kauth_init(); 297 secmodel_start(); 298 299 /* Initialize the buffer cache */ 300 bufinit(); 301 302 /* 303 * Initialize mbuf's. Do this now because we might attempt to 304 * allocate mbufs or mbuf clusters during autoconfiguration. 305 */ 306 mbinit(); 307 308 /* Initialize sockets. */ 309 soinit(); 310 311 /* 312 * The following things must be done before autoconfiguration. 313 */ 314 evcnt_init(); /* initialize event counters */ 315 #if NRND > 0 316 rnd_init(); /* initialize RNG */ 317 #endif 318 319 /* Initialize process and pgrp structures. */ 320 procinit(); 321 lwpinit(); 322 323 /* Initialize signal-related data structures. */ 324 signal_init(); 325 326 /* Create process 0 (the swapper). */ 327 proc0_init(); 328 329 /* Initialize the UID hash table. */ 330 uid_init(); 331 332 /* Charge root for one process. */ 333 (void)chgproccnt(0, 1); 334 335 /* Initialize the run queues, turnstiles and sleep queues. */ 336 sched_rqinit(); 337 turnstile_init(); 338 sleeptab_init(&sleeptab); 339 340 /* MI initialization of the boot cpu */ 341 error = mi_cpu_attach(curcpu()); 342 KASSERT(error == 0); 343 344 /* Initialize callouts, part 2. */ 345 callout_startup2(); 346 347 /* Initialize the sysctl subsystem. */ 348 sysctl_init(); 349 350 /* Initialize I/O statistics. */ 351 iostat_init(); 352 353 /* Initialize the file systems. */ 354 #ifdef NVNODE_IMPLICIT 355 /* 356 * If maximum number of vnodes in namei vnode cache is not explicitly 357 * defined in kernel config, adjust the number such as we use roughly 358 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 359 */ 360 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 361 if (usevnodes > desiredvnodes) 362 desiredvnodes = usevnodes; 363 #endif 364 vfsinit(); 365 366 /* Initialize fstrans. */ 367 fstrans_init(); 368 369 /* Initialize the select()/poll() system calls. */ 370 selsysinit(); 371 372 /* Initialize asynchronous I/O. */ 373 aio_sysinit(); 374 375 #if NSYSMON_ENVSYS > 0 376 sysmon_envsys_init(); 377 #endif 378 #if NSYSMON_POWER > 0 379 sysmon_power_init(); 380 #endif 381 #ifdef __HAVE_TIMECOUNTER 382 inittimecounter(); 383 ntp_init(); 384 #endif /* __HAVE_TIMECOUNTER */ 385 386 /* Initialize the device switch tables. */ 387 devsw_init(); 388 389 /* Configure the system hardware. This will enable interrupts. */ 390 configure(); 391 392 #if defined(__SSP__) || defined(__SSP_ALL__) 393 { 394 #ifdef DIAGNOSTIC 395 printf("Initializing SSP:"); 396 #endif 397 /* 398 * We initialize ssp here carefully: 399 * 1. after we got some entropy 400 * 2. without calling a function 401 */ 402 size_t i; 403 long guard[__arraycount(__stack_chk_guard)]; 404 405 arc4randbytes(guard, sizeof(guard)); 406 for (i = 0; i < __arraycount(guard); i++) 407 __stack_chk_guard[i] = guard[i]; 408 #ifdef DIAGNOSTIC 409 for (i = 0; i < __arraycount(guard); i++) 410 printf("%lx ", guard[i]); 411 printf("\n"); 412 #endif 413 } 414 #endif 415 ubc_init(); /* must be after autoconfig */ 416 417 /* Lock the kernel on behalf of proc0. */ 418 KERNEL_LOCK(1, l); 419 420 #ifdef SYSTRACE 421 systrace_init(); 422 #endif 423 424 #ifdef SYSVSHM 425 /* Initialize System V style shared memory. */ 426 shminit(); 427 #endif 428 429 #ifdef SYSVSEM 430 /* Initialize System V style semaphores. */ 431 seminit(); 432 #endif 433 434 #ifdef SYSVMSG 435 /* Initialize System V style message queues. */ 436 msginit(); 437 #endif 438 439 #ifdef P1003_1B_SEMAPHORE 440 /* Initialize posix semaphores */ 441 ksem_init(); 442 #endif 443 444 #if NVERIEXEC > 0 445 /* 446 * Initialise the Veriexec subsystem. 447 */ 448 veriexec_init(); 449 #endif /* NVERIEXEC > 0 */ 450 451 #if defined(PAX_MPROTECT) || defined(PAX_SEGVGUARD) 452 pax_init(); 453 #endif /* PAX_MPROTECT || PAX_SEGVGUARD */ 454 455 /* Attach pseudo-devices. */ 456 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 457 (*pdev->pdev_attach)(pdev->pdev_count); 458 459 #ifdef FAST_IPSEC 460 /* Attach network crypto subsystem */ 461 ipsec_attach(); 462 #endif 463 464 /* 465 * Initialize protocols. Block reception of incoming packets 466 * until everything is ready. 467 */ 468 s = splnet(); 469 ifinit(); 470 domaininit(); 471 if_attachdomain(); 472 splx(s); 473 474 #ifdef GPROF 475 /* Initialize kernel profiling. */ 476 kmstartup(); 477 #endif 478 479 /* Initialize system accouting. */ 480 acct_init(); 481 482 #ifndef PIPE_SOCKETPAIR 483 /* Initialize pipes. */ 484 pipe_init(); 485 #endif 486 487 /* Setup the scheduler */ 488 sched_init(); 489 490 #ifdef KTRACE 491 /* Initialize ktrace. */ 492 ktrinit(); 493 #endif 494 495 /* Initialize the UUID system calls. */ 496 uuid_init(); 497 498 /* 499 * Create process 1 (init(8)). We do this now, as Unix has 500 * historically had init be process 1, and changing this would 501 * probably upset a lot of people. 502 * 503 * Note that process 1 won't immediately exec init(8), but will 504 * wait for us to inform it that the root file system has been 505 * mounted. 506 */ 507 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 508 panic("fork init"); 509 510 /* 511 * Now that device driver threads have been created, wait for 512 * them to finish any deferred autoconfiguration. Note we don't 513 * need to lock this semaphore, since we haven't booted any 514 * secondary processors, yet. 515 */ 516 while (config_pending) 517 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 518 519 /* 520 * Finalize configuration now that all real devices have been 521 * found. This needs to be done before the root device is 522 * selected, since finalization may create the root device. 523 */ 524 config_finalize(); 525 526 /* 527 * Now that autoconfiguration has completed, we can determine 528 * the root and dump devices. 529 */ 530 cpu_rootconf(); 531 cpu_dumpconf(); 532 533 /* Mount the root file system. */ 534 do { 535 domountroothook(); 536 if ((error = vfs_mountroot())) { 537 printf("cannot mount root, error = %d\n", error); 538 boothowto |= RB_ASKNAME; 539 setroot(root_device, 540 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 541 } 542 } while (error != 0); 543 mountroothook_destroy(); 544 545 /* 546 * Initialise the time-of-day clock, passing the time recorded 547 * in the root filesystem (if any) for use by systems that 548 * don't have a non-volatile time-of-day device. 549 */ 550 inittodr(rootfstime); 551 552 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 553 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 554 555 /* 556 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 557 * reference it. 558 */ 559 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 560 if (error) 561 panic("cannot find root vnode, error=%d", error); 562 cwdi0.cwdi_cdir = rootvnode; 563 VREF(cwdi0.cwdi_cdir); 564 VOP_UNLOCK(rootvnode, 0); 565 cwdi0.cwdi_rdir = NULL; 566 567 /* 568 * Now that root is mounted, we can fixup initproc's CWD 569 * info. All other processes are kthreads, which merely 570 * share proc0's CWD info. 571 */ 572 initproc->p_cwdi->cwdi_cdir = rootvnode; 573 VREF(initproc->p_cwdi->cwdi_cdir); 574 initproc->p_cwdi->cwdi_rdir = NULL; 575 576 /* 577 * Now can look at time, having had a chance to verify the time 578 * from the file system. Reset l->l_rtime as it may have been 579 * munched in mi_switch() after the time got set. 580 */ 581 #ifdef __HAVE_TIMECOUNTER 582 getmicrotime(&time); 583 #else 584 mono_time = time; 585 #endif 586 boottime = time; 587 mutex_enter(&proclist_lock); 588 LIST_FOREACH(p, &allproc, p_list) { 589 KASSERT((p->p_flag & PK_MARKER) == 0); 590 mutex_enter(&p->p_smutex); 591 p->p_stats->p_start = time; 592 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 593 lwp_lock(l); 594 l->l_cpu->ci_schedstate.spc_runtime = time; 595 l->l_rtime.tv_sec = l->l_rtime.tv_usec = 0; 596 lwp_unlock(l); 597 } 598 mutex_exit(&p->p_smutex); 599 } 600 mutex_exit(&proclist_lock); 601 602 /* Create the pageout daemon kernel thread. */ 603 uvm_swap_init(); 604 if (kthread_create(PVM, 0, NULL, uvm_pageout, 605 NULL, NULL, "pgdaemon")) 606 panic("fork pagedaemon"); 607 608 /* Create the filesystem syncer kernel thread. */ 609 if (kthread_create(PINOD, 0, NULL, sched_sync, NULL, NULL, "ioflush")) 610 panic("fork syncer"); 611 612 /* Create the aiodone daemon kernel thread. */ 613 if (workqueue_create(&uvm.aiodone_queue, "aiodoned", 614 uvm_aiodone_worker, NULL, PVM, IPL_BIO, 0)) 615 panic("fork aiodoned"); 616 617 vmem_rehash_start(); 618 619 #if defined(MULTIPROCESSOR) 620 /* Boot the secondary processors. */ 621 cpu_boot_secondary_processors(); 622 #endif 623 624 /* Initialize exec structures */ 625 exec_init(1); 626 627 /* 628 * Okay, now we can let init(8) exec! It's off to userland! 629 */ 630 start_init_exec = 1; 631 wakeup(&start_init_exec); 632 633 /* The scheduler is an infinite loop. */ 634 uvm_scheduler(); 635 /* NOTREACHED */ 636 } 637 638 void 639 setrootfstime(time_t t) 640 { 641 rootfstime = t; 642 } 643 644 static void 645 check_console(struct lwp *l) 646 { 647 struct nameidata nd; 648 int error; 649 650 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", l); 651 error = namei(&nd); 652 if (error == 0) 653 vrele(nd.ni_vp); 654 else if (error == ENOENT) 655 printf("warning: no /dev/console\n"); 656 else 657 printf("warning: lookup /dev/console: error %d\n", error); 658 } 659 660 /* 661 * List of paths to try when searching for "init". 662 */ 663 static const char *initpaths[] = { 664 "/sbin/init", 665 "/sbin/oinit", 666 "/sbin/init.bak", 667 NULL, 668 }; 669 670 /* 671 * Start the initial user process; try exec'ing each pathname in "initpaths". 672 * The program is invoked with one argument containing the boot flags. 673 */ 674 static void 675 start_init(void *arg) 676 { 677 struct lwp *l = arg; 678 struct proc *p = l->l_proc; 679 vaddr_t addr; 680 struct sys_execve_args /* { 681 syscallarg(const char *) path; 682 syscallarg(char * const *) argp; 683 syscallarg(char * const *) envp; 684 } */ args; 685 int options, i, error; 686 register_t retval[2]; 687 char flags[4], *flagsp; 688 const char *path, *slash; 689 char *ucp, **uap, *arg0, *arg1 = NULL; 690 char ipath[129]; 691 int ipx, len; 692 693 /* 694 * Now in process 1. 695 */ 696 strncpy(p->p_comm, "init", MAXCOMLEN); 697 698 /* 699 * Wait for main() to tell us that it's safe to exec. 700 */ 701 while (start_init_exec == 0) 702 (void) tsleep(&start_init_exec, PWAIT, "initexec", 0); 703 704 /* 705 * This is not the right way to do this. We really should 706 * hand-craft a descriptor onto /dev/console to hand to init, 707 * but that's a _lot_ more work, and the benefit from this easy 708 * hack makes up for the "good is the enemy of the best" effect. 709 */ 710 check_console(l); 711 712 /* 713 * Need just enough stack to hold the faked-up "execve()" arguments. 714 */ 715 addr = (vaddr_t)STACK_ALLOC(USRSTACK, PAGE_SIZE); 716 if (uvm_map(&p->p_vmspace->vm_map, &addr, PAGE_SIZE, 717 NULL, UVM_UNKNOWN_OFFSET, 0, 718 UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY, 719 UVM_ADV_NORMAL, 720 UVM_FLAG_FIXED|UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)) != 0) 721 panic("init: couldn't allocate argument space"); 722 p->p_vmspace->vm_maxsaddr = (void *)STACK_MAX(addr, PAGE_SIZE); 723 724 ipx = 0; 725 while (1) { 726 if (boothowto & RB_ASKNAME) { 727 printf("init path"); 728 if (initpaths[ipx]) 729 printf(" (default %s)", initpaths[ipx]); 730 printf(": "); 731 len = cngetsn(ipath, sizeof(ipath)-1); 732 if (len == 0) { 733 if (initpaths[ipx]) 734 path = initpaths[ipx++]; 735 else 736 continue; 737 } else { 738 ipath[len] = '\0'; 739 path = ipath; 740 } 741 } else { 742 if ((path = initpaths[ipx++]) == NULL) 743 break; 744 } 745 746 ucp = (char *)USRSTACK; 747 748 /* 749 * Construct the boot flag argument. 750 */ 751 flagsp = flags; 752 *flagsp++ = '-'; 753 options = 0; 754 755 if (boothowto & RB_SINGLE) { 756 *flagsp++ = 's'; 757 options = 1; 758 } 759 #ifdef notyet 760 if (boothowto & RB_FASTBOOT) { 761 *flagsp++ = 'f'; 762 options = 1; 763 } 764 #endif 765 766 /* 767 * Move out the flags (arg 1), if necessary. 768 */ 769 if (options != 0) { 770 *flagsp++ = '\0'; 771 i = flagsp - flags; 772 #ifdef DEBUG 773 printf("init: copying out flags `%s' %d\n", flags, i); 774 #endif 775 arg1 = STACK_ALLOC(ucp, i); 776 ucp = STACK_MAX(arg1, i); 777 (void)copyout((void *)flags, arg1, i); 778 } 779 780 /* 781 * Move out the file name (also arg 0). 782 */ 783 i = strlen(path) + 1; 784 #ifdef DEBUG 785 printf("init: copying out path `%s' %d\n", path, i); 786 #else 787 if (boothowto & RB_ASKNAME || path != initpaths[0]) 788 printf("init: trying %s\n", path); 789 #endif 790 arg0 = STACK_ALLOC(ucp, i); 791 ucp = STACK_MAX(arg0, i); 792 (void)copyout(path, arg0, i); 793 794 /* 795 * Move out the arg pointers. 796 */ 797 ucp = (void *)STACK_ALIGN(ucp, ALIGNBYTES); 798 uap = (char **)STACK_ALLOC(ucp, sizeof(char *) * 3); 799 SCARG(&args, path) = arg0; 800 SCARG(&args, argp) = uap; 801 SCARG(&args, envp) = NULL; 802 slash = strrchr(path, '/'); 803 if (slash) 804 (void)suword((void *)uap++, 805 (long)arg0 + (slash + 1 - path)); 806 else 807 (void)suword((void *)uap++, (long)arg0); 808 if (options != 0) 809 (void)suword((void *)uap++, (long)arg1); 810 (void)suword((void *)uap++, 0); /* terminator */ 811 812 /* 813 * Now try to exec the program. If can't for any reason 814 * other than it doesn't exist, complain. 815 */ 816 error = sys_execve(l, &args, retval); 817 if (error == 0 || error == EJUSTRETURN) { 818 KERNEL_UNLOCK_LAST(l); 819 return; 820 } 821 printf("exec %s: error %d\n", path, error); 822 } 823 printf("init: not found\n"); 824 panic("no init"); 825 } 826
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