init_main.c revision 1.250
1 /* $NetBSD: init_main.c,v 1.250 2005/07/16 22:47:18 christos 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 1.250 2005/07/16 22:47:18 christos Exp $"); 75 76 #include "fs_nfs.h" 77 #include "opt_nfsserver.h" 78 #include "opt_ipsec.h" 79 #include "opt_sysv.h" 80 #include "opt_maxuprc.h" 81 #include "opt_multiprocessor.h" 82 #include "opt_pipe.h" 83 #include "opt_syscall_debug.h" 84 #include "opt_systrace.h" 85 #include "opt_posix.h" 86 #include "opt_kcont.h" 87 #include "opt_rootfs_magiclinks.h" 88 #include "opt_verified_exec.h" 89 90 #include "opencrypto.h" 91 #include "rnd.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/kernel.h> 100 #include <sys/kcont.h> 101 #include <sys/mount.h> 102 #include <sys/proc.h> 103 #include <sys/kthread.h> 104 #include <sys/resourcevar.h> 105 #include <sys/signalvar.h> 106 #include <sys/systm.h> 107 #include <sys/vnode.h> 108 #include <sys/tty.h> 109 #include <sys/conf.h> 110 #include <sys/disklabel.h> 111 #include <sys/buf.h> 112 #include <sys/device.h> 113 #include <sys/exec.h> 114 #include <sys/socketvar.h> 115 #include <sys/protosw.h> 116 #include <sys/reboot.h> 117 #include <sys/user.h> 118 #include <sys/sysctl.h> 119 #include <sys/event.h> 120 #include <sys/mbuf.h> 121 #ifdef FAST_IPSEC 122 #include <netipsec/ipsec.h> 123 #endif 124 #ifdef SYSVSHM 125 #include <sys/shm.h> 126 #endif 127 #ifdef SYSVSEM 128 #include <sys/sem.h> 129 #endif 130 #ifdef SYSVMSG 131 #include <sys/msg.h> 132 #endif 133 #ifdef P1003_1B_SEMAPHORE 134 #include <sys/ksem.h> 135 #endif 136 #ifdef SYSTRACE 137 #include <sys/systrace.h> 138 #endif 139 #include <sys/domain.h> 140 #include <sys/namei.h> 141 #if NOPENCRYPTO > 0 142 #include <opencrypto/cryptodev.h> /* XXX really the framework */ 143 #endif 144 #if NRND > 0 145 #include <sys/rnd.h> 146 #endif 147 #ifndef PIPE_SOCKETPAIR 148 #include <sys/pipe.h> 149 #endif 150 #ifdef LKM 151 #include <sys/lkm.h> 152 #endif 153 #ifdef VERIFIED_EXEC 154 #include <sys/verified_exec.h> 155 #endif 156 157 #include <sys/syscall.h> 158 #include <sys/sa.h> 159 #include <sys/syscallargs.h> 160 161 #include <ufs/ufs/quota.h> 162 163 #include <miscfs/genfs/genfs.h> 164 #include <miscfs/syncfs/syncfs.h> 165 166 #include <machine/cpu.h> 167 168 #include <uvm/uvm.h> 169 170 #include <dev/cons.h> 171 172 #include <net/if.h> 173 #include <net/raw_cb.h> 174 175 /* Components of the first process -- never freed. */ 176 struct session session0; 177 struct pgrp pgrp0; 178 struct proc proc0; 179 struct lwp lwp0; 180 struct pcred cred0; 181 struct filedesc0 filedesc0; 182 struct cwdinfo cwdi0; 183 struct plimit limit0; 184 struct pstats pstat0; 185 struct vmspace vmspace0; 186 struct sigacts sigacts0; 187 #ifndef curlwp 188 struct lwp *curlwp = &lwp0; 189 #endif 190 struct proc *initproc; 191 192 int nofile = NOFILE; 193 int maxuprc = MAXUPRC; 194 int cmask = CMASK; 195 extern struct user *proc0paddr; 196 197 struct vnode *rootvp, *swapdev_vp; 198 int boothowto; 199 int cold = 1; /* still working on startup */ 200 struct timeval boottime; 201 time_t rootfstime; /* recorded root fs time, if known */ 202 203 __volatile int start_init_exec; /* semaphore for start_init() */ 204 205 static void check_console(struct proc *p); 206 static void start_init(void *); 207 void main(void); 208 209 extern const struct emul emul_netbsd; /* defined in kern_exec.c */ 210 211 /* 212 * System startup; initialize the world, create process 0, mount root 213 * filesystem, and fork to create init and pagedaemon. Most of the 214 * hard work is done in the lower-level initialization routines including 215 * startup(), which does memory initialization and autoconfiguration. 216 */ 217 void 218 main(void) 219 { 220 struct lwp *l; 221 struct proc *p; 222 struct pdevinit *pdev; 223 int s, error; 224 u_int i; 225 rlim_t lim; 226 extern struct pdevinit pdevinit[]; 227 extern void schedcpu(void *); 228 #if defined(NFSSERVER) || defined(NFS) 229 extern void nfs_init(void); 230 #endif 231 #ifdef NVNODE_IMPLICIT 232 int usevnodes; 233 #endif 234 235 /* 236 * Initialize the current LWP pointer (curlwp) before 237 * any possible traps/probes to simplify trap processing. 238 */ 239 l = &lwp0; 240 curlwp = l; 241 l->l_cpu = curcpu(); 242 l->l_proc = &proc0; 243 l->l_lid = 1; 244 245 /* 246 * Attempt to find console and initialize 247 * in case of early panic or other messages. 248 */ 249 consinit(); 250 251 KERNEL_LOCK_INIT(); 252 253 uvm_init(); 254 255 /* Do machine-dependent initialization. */ 256 cpu_startup(); 257 258 /* Initialize callouts. */ 259 callout_startup(); 260 261 /* Initialize the buffer cache */ 262 bufinit(); 263 264 /* 265 * Initialize mbuf's. Do this now because we might attempt to 266 * allocate mbufs or mbuf clusters during autoconfiguration. 267 */ 268 mbinit(); 269 270 /* Initialize sockets. */ 271 soinit(); 272 273 #ifdef KCONT 274 /* Initialize kcont. */ 275 kcont_init(); 276 #endif 277 278 /* 279 * The following things must be done before autoconfiguration. 280 */ 281 evcnt_init(); /* initialize event counters */ 282 tty_init(); /* initialize tty list */ 283 #if NRND > 0 284 rnd_init(); /* initialize RNG */ 285 #endif 286 #if NOPENCRYPTO > 0 287 /* Initialize crypto subsystem before configuring crypto hardware. */ 288 (void)crypto_init(); 289 #endif 290 /* Initialize the sysctl subsystem. */ 291 sysctl_init(); 292 293 /* Initialize process and pgrp structures. */ 294 procinit(); 295 296 #ifdef LKM 297 /* Initialize the LKM system. */ 298 lkm_init(); 299 #endif 300 301 /* 302 * Create process 0 (the swapper). 303 */ 304 p = &proc0; 305 proc0_insert(p, l, &pgrp0, &session0); 306 307 /* 308 * Set P_NOCLDWAIT so that kernel threads are reparented to 309 * init(8) when they exit. init(8) can easily wait them out 310 * for us. 311 */ 312 p->p_flag = P_SYSTEM | P_NOCLDWAIT; 313 p->p_stat = SACTIVE; 314 p->p_nice = NZERO; 315 p->p_emul = &emul_netbsd; 316 #ifdef __HAVE_SYSCALL_INTERN 317 (*p->p_emul->e_syscall_intern)(p); 318 #endif 319 strncpy(p->p_comm, "swapper", MAXCOMLEN); 320 321 l->l_flag = L_INMEM; 322 l->l_stat = LSONPROC; 323 p->p_nrlwps = 1; 324 325 callout_init(&l->l_tsleep_ch); 326 327 /* Create credentials. */ 328 cred0.p_refcnt = 1; 329 p->p_cred = &cred0; 330 p->p_ucred = crget(); 331 p->p_ucred->cr_ngroups = 1; /* group 0 */ 332 333 /* Create the file descriptor table. */ 334 p->p_fd = &filedesc0.fd_fd; 335 fdinit1(&filedesc0); 336 337 /* Create the CWD info. */ 338 p->p_cwdi = &cwdi0; 339 cwdi0.cwdi_cmask = cmask; 340 cwdi0.cwdi_refcnt = 1; 341 simple_lock_init(&cwdi0.cwdi_slock); 342 343 /* Create the limits structures. */ 344 p->p_limit = &limit0; 345 simple_lock_init(&limit0.p_slock); 346 for (i = 0; i < sizeof(p->p_rlimit)/sizeof(p->p_rlimit[0]); i++) 347 limit0.pl_rlimit[i].rlim_cur = 348 limit0.pl_rlimit[i].rlim_max = RLIM_INFINITY; 349 350 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles; 351 limit0.pl_rlimit[RLIMIT_NOFILE].rlim_cur = 352 maxfiles < nofile ? maxfiles : nofile; 353 354 limit0.pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc; 355 limit0.pl_rlimit[RLIMIT_NPROC].rlim_cur = 356 maxproc < maxuprc ? maxproc : maxuprc; 357 358 lim = ptoa(uvmexp.free); 359 limit0.pl_rlimit[RLIMIT_RSS].rlim_max = lim; 360 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_max = lim; 361 limit0.pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = lim / 3; 362 limit0.pl_corename = defcorename; 363 limit0.p_refcnt = 1; 364 365 /* 366 * Initialize proc0's vmspace, which uses the kernel pmap. 367 * All kernel processes (which never have user space mappings) 368 * share proc0's vmspace, and thus, the kernel pmap. 369 */ 370 uvmspace_init(&vmspace0, pmap_kernel(), round_page(VM_MIN_ADDRESS), 371 trunc_page(VM_MAX_ADDRESS)); 372 p->p_vmspace = &vmspace0; 373 374 l->l_addr = proc0paddr; /* XXX */ 375 376 p->p_stats = &pstat0; 377 378 /* 379 * Charge root for one process. 380 */ 381 (void)chgproccnt(0, 1); 382 383 rqinit(); 384 385 /* Configure virtual memory system, set vm rlimits. */ 386 uvm_init_limits(p); 387 388 /* Initialize the file systems. */ 389 #if defined(NFSSERVER) || defined(NFS) 390 nfs_init(); /* initialize server/shared data */ 391 #endif 392 #ifdef NVNODE_IMPLICIT 393 /* 394 * If maximum number of vnodes in namei vnode cache is not explicitly 395 * defined in kernel config, adjust the number such as we use roughly 396 * 1.0% of memory for vnode cache (but not less than NVNODE vnodes). 397 */ 398 usevnodes = (ptoa((unsigned)physmem) / 100) / sizeof(struct vnode); 399 if (usevnodes > desiredvnodes) 400 desiredvnodes = usevnodes; 401 #endif 402 vfsinit(); 403 404 /* Configure the system hardware. This will enable interrupts. */ 405 configure(); 406 407 ubc_init(); /* must be after autoconfig */ 408 409 /* Lock the kernel on behalf of proc0. */ 410 KERNEL_PROC_LOCK(l); 411 412 #ifdef SYSVSHM 413 /* Initialize System V style shared memory. */ 414 shminit(); 415 #endif 416 417 #ifdef SYSVSEM 418 /* Initialize System V style semaphores. */ 419 seminit(); 420 #endif 421 422 #ifdef SYSVMSG 423 /* Initialize System V style message queues. */ 424 msginit(); 425 #endif 426 427 #ifdef P1003_1B_SEMAPHORE 428 /* Initialize posix semaphores */ 429 ksem_init(); 430 #endif 431 432 #ifdef VERIFIED_EXEC 433 /* 434 * Initialise the fingerprint operations vectors before 435 * fingerprints can be loaded. 436 */ 437 veriexec_init_fp_ops(); 438 #endif 439 440 /* Attach pseudo-devices. */ 441 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 442 (*pdev->pdev_attach)(pdev->pdev_count); 443 444 #ifdef FAST_IPSEC 445 /* Attach network crypto subsystem */ 446 ipsec_attach(); 447 #endif 448 449 /* 450 * Initialize protocols. Block reception of incoming packets 451 * until everything is ready. 452 */ 453 s = splnet(); 454 ifinit(); 455 domaininit(); 456 if_attachdomain(); 457 splx(s); 458 459 #ifdef GPROF 460 /* Initialize kernel profiling. */ 461 kmstartup(); 462 #endif 463 464 /* Initialize system accouting. */ 465 acct_init(); 466 467 #ifdef SYSTRACE 468 systrace_init(); 469 #endif 470 /* 471 * Initialize signal-related data structures, and signal state 472 * for proc0. 473 */ 474 signal_init(); 475 p->p_sigacts = &sigacts0; 476 siginit(p); 477 478 /* Kick off timeout driven events by calling first time. */ 479 schedcpu(NULL); 480 481 /* 482 * Create process 1 (init(8)). We do this now, as Unix has 483 * historically had init be process 1, and changing this would 484 * probably upset a lot of people. 485 * 486 * Note that process 1 won't immediately exec init(8), but will 487 * wait for us to inform it that the root file system has been 488 * mounted. 489 */ 490 if (fork1(l, 0, SIGCHLD, NULL, 0, start_init, NULL, NULL, &initproc)) 491 panic("fork init"); 492 493 /* 494 * Create any kernel threads who's creation was deferred because 495 * initproc had not yet been created. 496 */ 497 kthread_run_deferred_queue(); 498 499 /* 500 * Now that device driver threads have been created, wait for 501 * them to finish any deferred autoconfiguration. Note we don't 502 * need to lock this semaphore, since we haven't booted any 503 * secondary processors, yet. 504 */ 505 while (config_pending) 506 (void) tsleep(&config_pending, PWAIT, "cfpend", 0); 507 508 /* 509 * Finalize configuration now that all real devices have been 510 * found. This needs to be done before the root device is 511 * selected, since finalization may create the root device. 512 */ 513 config_finalize(); 514 515 /* 516 * Now that autoconfiguration has completed, we can determine 517 * the root and dump devices. 518 */ 519 cpu_rootconf(); 520 cpu_dumpconf(); 521 522 /* Mount the root file system. */ 523 do { 524 domountroothook(); 525 if ((error = vfs_mountroot())) { 526 printf("cannot mount root, error = %d\n", error); 527 boothowto |= RB_ASKNAME; 528 setroot(root_device, 529 (rootdev != NODEV) ? DISKPART(rootdev) : 0); 530 } 531 } while (error != 0); 532 mountroothook_destroy(); 533 534 /* 535 * Initialise the time-of-day clock, passing the time recorded 536 * in the root filesystem (if any) for use by systems that 537 * don't have a non-volatile time-of-day device. 538 */ 539 inittodr(rootfstime); 540 541 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_ROOTFS; 542 #ifdef ROOTFS_MAGICLINKS 543 CIRCLEQ_FIRST(&mountlist)->mnt_flag |= MNT_MAGICLINKS; 544 #endif 545 CIRCLEQ_FIRST(&mountlist)->mnt_op->vfs_refcount++; 546 547 /* 548 * Get the vnode for '/'. Set filedesc0.fd_fd.fd_cdir to 549 * reference it. 550 */ 551 error = VFS_ROOT(CIRCLEQ_FIRST(&mountlist), &rootvnode); 552 if (error) 553 panic("cannot find root vnode, error=%d", error); 554 cwdi0.cwdi_cdir = rootvnode; 555 VREF(cwdi0.cwdi_cdir); 556 VOP_UNLOCK(rootvnode, 0); 557 cwdi0.cwdi_rdir = NULL; 558 559 /* 560 * Now that root is mounted, we can fixup initproc's CWD 561 * info. All other processes are kthreads, which merely 562 * share proc0's CWD info. 563 */ 564 initproc->p_cwdi->cwdi_cdir = rootvnode; 565 VREF(initproc->p_cwdi->cwdi_cdir); 566 initproc->p_cwdi->cwdi_rdir = NULL; 567 568 /* 569 * Now can look at time, having had a chance to verify the time 570 * from the file system. Reset p->p_rtime as it may have been 571 * munched in mi_switch() after the time got set. 572 */ 573 proclist_lock_read(); 574 s = splsched(); 575 LIST_FOREACH(p, &allproc, p_list) { 576 KASSERT((p->p_flag & P_MARKER) == 0); 577 p->p_stats->p_start = mono_time = boottime = time; 578 LIST_FOREACH(l, &p->p_lwps, l_sibling) { 579 if (l->l_cpu != NULL) 580 l->l_cpu->ci_schedstate.spc_runtime = time; 581 } 582 p->p_rtime.tv_sec = p->p_rtime.tv_usec = 0; 583 } 584 splx(s); 585 proclist_unlock_read(); 586 587 /* Create the pageout daemon kernel thread. */ 588 uvm_swap_init(); 589 if (kthread_create1(uvm_pageout, NULL, NULL, "pagedaemon")) 590 panic("fork pagedaemon"); 591 592 /* Create the filesystem syncer kernel thread. */ 593 if (kthread_create1(sched_sync, NULL, NULL, "ioflush")) 594 panic("fork syncer"); 595 596 /* Create the aiodone daemon kernel thread. */ 597 if (kthread_create1(uvm_aiodone_daemon, NULL, &uvm.aiodoned_proc, 598 "aiodoned")) 599 panic("fork aiodoned"); 600 601 #if defined(MULTIPROCESSOR) 602 /* Boot the secondary processors. */ 603 cpu_boot_secondary_processors(); 604 #endif 605 606 /* Initialize exec structures */ 607 exec_init(1); 608 609 /* 610 * Okay, now we can let init(8) exec! It's off to userland! 611 */ 612 start_init_exec = 1; 613 wakeup(&start_init_exec); 614 615 /* The scheduler is an infinite loop. */ 616 uvm_scheduler(); 617 /* NOTREACHED */ 618 } 619 620 void 621 setrootfstime(time_t t) 622 { 623 624 rootfstime = t; 625 } 626 627 static void 628 check_console(struct proc *p) 629 { 630 struct nameidata nd; 631 int error; 632 633 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/console", p); 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(p); 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 = (caddr_t)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((caddr_t)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 = (caddr_t)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((caddr_t)uap++, 788 (long)arg0 + (slash + 1 - path)); 789 else 790 (void)suword((caddr_t)uap++, (long)arg0); 791 if (options != 0) 792 (void)suword((caddr_t)uap++, (long)arg1); 793 (void)suword((caddr_t)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(LIST_FIRST(&p->p_lwps), &args, retval); 800 if (error == 0 || error == EJUSTRETURN) { 801 KERNEL_PROC_UNLOCK(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 19:09:51 GMT 2025